1 This document summarizes new features and bugfixes in each stable
2 release of Tor. If you want to see more detailed descriptions of the
3 changes in each development snapshot, see the ChangeLog file.
5 Changes in version 0.4.6.7 - 2021-08-16
6 This version fixes several bugs from earlier versions of Tor, including one
7 that could lead to a denial-of-service attack. Everyone running an earlier
8 version, whether as a client, a relay, or an onion service, should upgrade
9 to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
11 o Major bugfixes (cryptography, security):
12 - Resolve an assertion failure caused by a behavior mismatch between our
13 batch-signature verification code and our single-signature verification
14 code. This assertion failure could be triggered remotely, leading to a
15 denial of service attack. We fix this issue by disabling batch
16 verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
17 also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
20 o Minor feature (fallbackdir):
21 - Regenerate fallback directories list. Close ticket 40447.
23 o Minor features (geoip data):
24 - Update the geoip files to match the IPFire Location Database,
25 as retrieved on 2021/08/12.
27 o Minor bugfix (crypto):
28 - Disable the unused batch verification feature of ed25519-donna. Fixes
29 bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
31 o Minor bugfixes (onion service):
32 - Send back the extended SOCKS error 0xF6 (Onion Service Invalid Address)
33 for a v2 onion address. Fixes bug 40421; bugfix on 0.4.6.2-alpha.
35 o Minor bugfixes (relay):
36 - Reduce the compression level for data streaming from HIGH to LOW in
37 order to reduce CPU load on the directory relays. Fixes bug 40301;
38 bugfix on 0.3.5.1-alpha.
40 o Minor bugfixes (timekeeping):
41 - Calculate the time of day correctly on systems where the time_t
42 type includes leap seconds. (This is not the case on most
43 operating systems, but on those where it occurs, our tor_timegm
44 function did not correctly invert the system's gmtime function,
45 which could result in assertion failures when calculating
46 voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
49 Changes in version 0.4.5.10 - 2021-08-16
50 This version fixes several bugs from earlier versions of Tor, including one
51 that could lead to a denial-of-service attack. Everyone running an earlier
52 version, whether as a client, a relay, or an onion service, should upgrade
53 to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
55 o Major bugfixes (cryptography, security):
56 - Resolve an assertion failure caused by a behavior mismatch between our
57 batch-signature verification code and our single-signature verification
58 code. This assertion failure could be triggered remotely, leading to a
59 denial of service attack. We fix this issue by disabling batch
60 verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
61 also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
64 o Minor feature (fallbackdir):
65 - Regenerate fallback directories list. Close ticket 40447.
67 o Minor features (geoip data):
68 - Update the geoip files to match the IPFire Location Database,
69 as retrieved on 2021/08/12.
71 o Minor features (testing):
72 - Enable the deterministic RNG for unit tests that covers the address set
73 bloomfilter-based API's. Fixes bug 40419; bugfix on 0.3.3.2-alpha.
75 o Minor bugfix (crypto):
76 - Disable the unused batch verification feature of ed25519-donna. Fixes
77 bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
79 o Minor bugfixes (relay, backport from 0.4.6.x):
80 - Reduce the compression level for data streaming from HIGH to LOW. Fixes
81 bug 40301; bugfix on 0.3.5.1-alpha.
83 o Minor bugfixes (timekeeping, backport from 0.4.6.x):
84 - Calculate the time of day correctly on systems where the time_t
85 type includes leap seconds. (This is not the case on most
86 operating systems, but on those where it occurs, our tor_timegm
87 function did not correctly invert the system's gmtime function,
88 which could result in assertion failures when calculating
89 voting schedules.) Fixes bug 40383; bugfix on 0.2.0.3-alpha.
91 o Minor bugfixes (warnings, portability, backport from 0.4.6.x):
92 - Suppress a strict-prototype warning when building with some versions
93 of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
96 Changes in version 0.3.5.16 - 2021-08-16
97 This version fixes several bugs from earlier versions of Tor, including one
98 that could lead to a denial-of-service attack. Everyone running an earlier
99 version, whether as a client, a relay, or an onion service, should upgrade
100 to Tor 0.3.5.16, 0.4.5.10, or 0.4.6.7.
102 o Major bugfixes (cryptography, security):
103 - Resolve an assertion failure caused by a behavior mismatch between our
104 batch-signature verification code and our single-signature verification
105 code. This assertion failure could be triggered remotely, leading to a
106 denial of service attack. We fix this issue by disabling batch
107 verification. Fixes bug 40078; bugfix on 0.2.6.1-alpha. This issue is
108 also tracked as TROVE-2021-007 and CVE-2021-38385. Found by Henry de
111 o Minor feature (fallbackdir):
112 - Regenerate fallback directories list. Close ticket 40447.
114 o Minor features (geoip data):
115 - Update the geoip files to match the IPFire Location Database,
116 as retrieved on 2021/08/12.
118 o Minor bugfix (crypto):
119 - Disable the unused batch verification feature of ed25519-donna. Fixes
120 bug 40078; bugfix on 0.2.6.1-alpha. Found by Henry de Valence.
122 o Minor bugfixes (relay, backport from 0.4.6.x):
123 - Reduce the compression level for data streaming from HIGH to LOW. Fixes
124 bug 40301; bugfix on 0.3.5.1-alpha.
127 Changes in version 0.4.6.6 - 2021-06-30
128 Tor 0.4.6.6 makes several small fixes on 0.4.6.5, including one that
129 allows Tor to build correctly on older versions of GCC. You should
130 upgrade to this version if you were having trouble building Tor
131 0.4.6.5; otherwise, there is probably no need.
133 o Minor bugfixes (compilation):
134 - Fix a compilation error when trying to build Tor with a compiler
135 that does not support const variables in static initializers.
136 Fixes bug 40410; bugfix on 0.4.6.5.
137 - Suppress a strict-prototype warning when building with some
138 versions of NSS. Fixes bug 40409; bugfix on 0.3.5.1-alpha.
140 o Minor bugfixes (testing):
141 - Enable the deterministic RNG for unit tests that covers the
142 address set bloomfilter-based API's. Fixes bug 40419; bugfix
146 Changes in version 0.4.5.9 - 2021-06-14
147 Tor 0.4.5.9 fixes several security issues, including a
148 denial-of-service attack against onion service clients, and another
149 denial-of-service attack against relays. Everybody should upgrade to
150 one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
152 o Major bugfixes (security, backport from 0.4.6.5):
153 - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
154 half-closed streams. Previously, clients failed to validate which
155 hop sent these cells: this would allow a relay on a circuit to end
156 a stream that wasn't actually built with it. Fixes bug 40389;
157 bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
158 003 and CVE-2021-34548.
160 o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
161 - Detect more failure conditions from the OpenSSL RNG code.
162 Previously, we would detect errors from a missing RNG
163 implementation, but not failures from the RNG code itself.
164 Fortunately, it appears those failures do not happen in practice
165 when Tor is using OpenSSL's default RNG implementation. Fixes bug
166 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
167 TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
169 o Major bugfixes (security, denial of service, backport from 0.4.6.5):
170 - Resist a hashtable-based CPU denial-of-service attack against
171 relays. Previously we used a naive unkeyed hash function to look
172 up circuits in a circuitmux object. An attacker could exploit this
173 to construct circuits with chosen circuit IDs, to create
174 collisions and make the hash table inefficient. Now we use a
175 SipHash construction here instead. Fixes bug 40391; bugfix on
176 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
177 CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
178 - Fix an out-of-bounds memory access in v3 onion service descriptor
179 parsing. An attacker could exploit this bug by crafting an onion
180 service descriptor that would crash any client that tried to visit
181 it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
182 tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
183 Glazunov from Google's Project Zero.
185 o Minor features (compatibility, backport from 0.4.6.4-rc):
186 - Remove an assertion function related to TLS renegotiation. It was
187 used nowhere outside the unit tests, and it was breaking
188 compilation with recent alpha releases of OpenSSL 3.0.0. Closes
191 o Minor features (geoip data):
192 - Update the geoip files to match the IPFire Location Database, as
193 retrieved on 2021/06/10.
195 o Minor bugfixes (control, sandbox, backport from 0.4.6.4-rc):
196 - Allow the control command SAVECONF to succeed when the seccomp
197 sandbox is enabled, and make SAVECONF keep only one backup file to
198 simplify implementation. Previously SAVECONF allowed a large
199 number of backup files, which made it incompatible with the
200 sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
203 o Minor bugfixes (metrics port, backport from 0.4.6.4-rc):
204 - Fix a bug that made tor try to re-bind() on an already open
205 MetricsPort every 60 seconds. Fixes bug 40370; bugfix
209 Changes in version 0.4.4.9 - 2021-06-14
210 Tor 0.4.4.9 fixes several security issues, including a
211 denial-of-service attack against onion service clients, and another
212 denial-of-service attack against relays. Everybody should upgrade to
213 one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
215 Note that the scheduled end-of-life date for the Tor 0.4.4.x series is
216 June 15. This is therefore the last release in its series. Everybody
217 still running 0.4.4.x should plan to upgrade to 0.4.5.x or later.
219 o Major bugfixes (security, backport from 0.4.6.5):
220 - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
221 half-closed streams. Previously, clients failed to validate which
222 hop sent these cells: this would allow a relay on a circuit to end
223 a stream that wasn't actually built with it. Fixes bug 40389;
224 bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
225 003 and CVE-2021-34548.
227 o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
228 - Detect more failure conditions from the OpenSSL RNG code.
229 Previously, we would detect errors from a missing RNG
230 implementation, but not failures from the RNG code itself.
231 Fortunately, it appears those failures do not happen in practice
232 when Tor is using OpenSSL's default RNG implementation. Fixes bug
233 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
234 TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
236 o Major bugfixes (security, denial of service, backport from 0.4.6.5):
237 - Resist a hashtable-based CPU denial-of-service attack against
238 relays. Previously we used a naive unkeyed hash function to look
239 up circuits in a circuitmux object. An attacker could exploit this
240 to construct circuits with chosen circuit IDs, to create
241 collisions and make the hash table inefficient. Now we use a
242 SipHash construction here instead. Fixes bug 40391; bugfix on
243 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
244 CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
245 - Fix an out-of-bounds memory access in v3 onion service descriptor
246 parsing. An attacker could exploit this bug by crafting an onion
247 service descriptor that would crash any client that tried to visit
248 it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
249 tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
250 Glazunov from Google's Project Zero.
252 o Minor features (compatibility, backport from 0.4.6.4-rc):
253 - Remove an assertion function related to TLS renegotiation. It was
254 used nowhere outside the unit tests, and it was breaking
255 compilation with recent alpha releases of OpenSSL 3.0.0. Closes
258 o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
259 - Regenerate the list of fallback directories to contain a new set
260 of 200 relays. Closes ticket 40265.
262 o Minor features (geoip data):
263 - Update the geoip files to match the IPFire Location Database, as
264 retrieved on 2021/06/10.
266 o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
267 - Fix a non-fatal BUG() message due to a too-early free of a string,
268 when listing a client connection from the DoS defenses subsystem.
269 Fixes bug 40345; bugfix on 0.4.3.4-rc.
271 o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
272 - Fix an indentation problem that led to a warning from GCC 11.1.1.
273 Fixes bug 40380; bugfix on 0.3.0.1-alpha.
276 Changes in version 0.3.5.15 - 2021-06-14
277 Tor 0.3.5.15 fixes several security issues, including a
278 denial-of-service attack against onion service clients, and another
279 denial-of-service attack against relays. Everybody should upgrade to
280 one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
282 o Major bugfixes (security, backport from 0.4.6.5):
283 - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
284 half-closed streams. Previously, clients failed to validate which
285 hop sent these cells: this would allow a relay on a circuit to end
286 a stream that wasn't actually built with it. Fixes bug 40389;
287 bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
288 003 and CVE-2021-34548.
290 o Major bugfixes (security, defense-in-depth, backport from 0.4.6.5):
291 - Detect more failure conditions from the OpenSSL RNG code.
292 Previously, we would detect errors from a missing RNG
293 implementation, but not failures from the RNG code itself.
294 Fortunately, it appears those failures do not happen in practice
295 when Tor is using OpenSSL's default RNG implementation. Fixes bug
296 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
297 TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
299 o Major bugfixes (security, denial of service, backport from 0.4.6.5):
300 - Resist a hashtable-based CPU denial-of-service attack against
301 relays. Previously we used a naive unkeyed hash function to look
302 up circuits in a circuitmux object. An attacker could exploit this
303 to construct circuits with chosen circuit IDs, to create
304 collisions and make the hash table inefficient. Now we use a
305 SipHash construction here instead. Fixes bug 40391; bugfix on
306 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
307 CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
308 - Fix an out-of-bounds memory access in v3 onion service descriptor
309 parsing. An attacker could exploit this bug by crafting an onion
310 service descriptor that would crash any client that tried to visit
311 it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
312 tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
313 Glazunov from Google's Project Zero.
315 o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
316 - Fix an indentation problem that led to a warning from GCC 11.1.1.
317 Fixes bug 40380; bugfix on 0.3.0.1-alpha.
319 o Minor features (compatibility, backport from 0.4.6.4-rc):
320 - Remove an assertion function related to TLS renegotiation. It was
321 used nowhere outside the unit tests, and it was breaking
322 compilation with recent alpha releases of OpenSSL 3.0.0. Closes
325 o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
326 - Regenerate the list of fallback directories to contain a new set
327 of 200 relays. Closes ticket 40265.
329 o Minor features (geoip data):
330 - Update the geoip files to match the IPFire Location Database, as
331 retrieved on 2021/06/10.
334 Changes in version 0.4.6.5 - 2021-06-14
335 Tor 0.4.6.5 is the first stable release in its series. The 0.4.6.x
336 series includes numerous features and bugfixes, including a significant
337 improvement to our circuit timeout algorithm that should improve
338 observed client performance, and a way for relays to report when they are
341 This release also includes security fixes for several security issues,
342 including a denial-of-service attack against onion service clients,
343 and another denial-of-service attack against relays. Everybody should
344 upgrade to one of 0.3.5.15, 0.4.4.9, 0.4.5.9, or 0.4.6.5.
346 Below are the changes since 0.4.5.8. For a list of changes since
347 0.4.6.4-rc, see the ChangeLog file.
349 o Major bugfixes (security):
350 - Don't allow relays to spoof RELAY_END or RELAY_RESOLVED cell on
351 half-closed streams. Previously, clients failed to validate which
352 hop sent these cells: this would allow a relay on a circuit to end
353 a stream that wasn't actually built with it. Fixes bug 40389;
354 bugfix on 0.3.5.1-alpha. This issue is also tracked as TROVE-2021-
355 003 and CVE-2021-34548.
357 o Major bugfixes (security, defense-in-depth):
358 - Detect more failure conditions from the OpenSSL RNG code.
359 Previously, we would detect errors from a missing RNG
360 implementation, but not failures from the RNG code itself.
361 Fortunately, it appears those failures do not happen in practice
362 when Tor is using OpenSSL's default RNG implementation. Fixes bug
363 40390; bugfix on 0.2.8.1-alpha. This issue is also tracked as
364 TROVE-2021-004. Reported by Jann Horn at Google's Project Zero.
366 o Major bugfixes (security, denial of service):
367 - Resist a hashtable-based CPU denial-of-service attack against
368 relays. Previously we used a naive unkeyed hash function to look
369 up circuits in a circuitmux object. An attacker could exploit this
370 to construct circuits with chosen circuit IDs, to create
371 collisions and make the hash table inefficient. Now we use a
372 SipHash construction here instead. Fixes bug 40391; bugfix on
373 0.2.4.4-alpha. This issue is also tracked as TROVE-2021-005 and
374 CVE-2021-34549. Reported by Jann Horn from Google's Project Zero.
375 - Fix an out-of-bounds memory access in v3 onion service descriptor
376 parsing. An attacker could exploit this bug by crafting an onion
377 service descriptor that would crash any client that tried to visit
378 it. Fixes bug 40392; bugfix on 0.3.0.1-alpha. This issue is also
379 tracked as TROVE-2021-006 and CVE-2021-34550. Reported by Sergei
380 Glazunov from Google's Project Zero.
382 o Major features (control port, onion services):
383 - Add controller support for creating version 3 onion services with
384 client authorization. Previously, only v2 onion services could be
385 created with client authorization. Closes ticket 40084. Patch by
388 o Major features (directory authority):
389 - When voting on a relay with a Sybil-like appearance, add the Sybil
390 flag when clearing out the other flags. This lets a relay operator
391 know why their relay hasn't been included in the consensus. Closes
392 ticket 40255. Patch by Neel Chauhan.
394 o Major features (metrics):
395 - Relays now report how overloaded they are in their extrainfo
396 documents. This information is controlled with the
397 OverloadStatistics torrc option, and it will be used to improve
398 decisions about the network's load balancing. Implements proposal
399 328; closes ticket 40222.
401 o Major features (relay, denial of service):
402 - Add a new DoS subsystem feature to control the rate of client
403 connections for relays. Closes ticket 40253.
405 o Major features (statistics):
406 - Relays now publish statistics about the number of v3 onion
407 services and volume of v3 onion service traffic, in the same
408 manner they already do for v2 onions. Closes ticket 23126.
410 o Major bugfixes (circuit build timeout):
411 - Improve the accuracy of our circuit build timeout calculation for
412 60%, 70%, and 80% build rates for various guard choices. We now
413 use a maximum likelihood estimator for Pareto parameters of the
414 circuit build time distribution, instead of a "right-censored
415 estimator". This causes clients to ignore circuits that never
416 finish building in their timeout calculations. Previously, clients
417 were counting such unfinished circuits as having the highest
418 possible build time value, when in reality these circuits most
419 likely just contain relays that are offline. We also now wait a
420 bit longer to let circuits complete for measurement purposes,
421 lower the minimum possible effective timeout from 1.5 seconds to
422 10ms, and increase the resolution of the circuit build time
423 histogram from 50ms bin widths to 10ms bin widths. Additionally,
424 we alter our estimate Xm by taking the maximum of the top 10 most
425 common build time values of the 10ms histogram, and compute Xm as
426 the average of these. Fixes bug 40168; bugfix on 0.2.2.14-alpha.
427 - Remove max_time calculation and associated warning from circuit
428 build timeout 'alpha' parameter estimation, as this is no longer
429 needed by our new estimator from 40168. Fixes bug 34088; bugfix
432 o Major bugfixes (signing key):
433 - In the tor-gencert utility, give an informative error message if
434 the passphrase given in `--create-identity-key` is too short.
435 Fixes bug 40189; bugfix on 0.2.0.1-alpha. Patch by Neel Chauhan.
437 o Minor features (bridge):
438 - We now announce the URL to Tor's new bridge status at
439 https://bridges.torproject.org/ when Tor is configured to run as a
440 bridge relay. Closes ticket 30477.
442 o Minor features (build system):
443 - New "make lsp" command to auto generate the compile_commands.json
444 file used by the ccls server. The "bear" program is needed for
445 this. Closes ticket 40227.
447 o Minor features (client):
448 - Clients now check whether their streams are attempting to re-enter
449 the Tor network (i.e. to send Tor traffic over Tor), and close
450 them preemptively if they think exit relays will refuse them for
451 this reason. See ticket 2667 for details. Closes ticket 40271.
453 o Minor features (command line):
454 - Add long format name "--torrc-file" equivalent to the existing
455 command-line option "-f". Closes ticket 40324. Patch by
458 o Minor features (command-line interface):
459 - Add build informations to `tor --version` in order to ease
460 reproducible builds. Closes ticket 32102.
461 - When parsing command-line flags that take an optional argument,
462 treat the argument as absent if it would start with a '-'
463 character. Arguments in that form are not intelligible for any of
464 our optional-argument flags. Closes ticket 40223.
465 - Allow a relay operator to list the ed25519 keys on the command
466 line by adding the `rsa` and `ed25519` arguments to the
467 --list-fingerprint flag to show the respective RSA and ed25519
468 relay fingerprint. Closes ticket 33632. Patch by Neel Chauhan.
470 o Minor features (compatibility):
471 - Remove an assertion function related to TLS renegotiation. It was
472 used nowhere outside the unit tests, and it was breaking
473 compilation with recent alpha releases of OpenSSL 3.0.0. Closes
476 o Minor features (control port, stream handling):
477 - Add the stream ID to the event line in the ADDRMAP control event.
478 Closes ticket 40249. Patch by Neel Chauhan.
480 o Minor features (dormant mode):
481 - Add a new 'DormantTimeoutEnabled' option to allow coarse-grained
482 control over whether the client ever becomes dormant from
483 inactivity. Most people won't need this. Closes ticket 40228.
484 - Add a new 'DormantTimeoutEnabled' option for coarse-grained
485 control over whether the client can become dormant from
486 inactivity. Most people won't need this. Closes ticket 40228.
488 o Minor features (geoip data):
489 - Update the geoip files to match the IPFire Location Database, as
490 retrieved on 2021/06/10.
492 o Minor features (logging):
493 - Edit heartbeat log messages so that more of them begin with the
494 string "Heartbeat: ". Closes ticket 40322; patch
496 - Change the DoS subsystem heartbeat line format to be more clear on
497 what has been detected/rejected, and which option is disabled (if
498 any). Closes ticket 40308.
499 - In src/core/mainloop/mainloop.c and src/core/mainloop/connection.c,
500 put brackets around IPv6 addresses in log messages. Closes ticket
501 40232. Patch by Neel Chauhan.
503 o Minor features (logging, diagnostic):
504 - Log decompression failures at a higher severity level, since they
505 can help provide missing context for other warning messages. We
506 rate-limit these messages, to avoid flooding the logs if they
507 begin to occur frequently. Closes ticket 40175.
509 o Minor features (onion services):
510 - Add a warning message when trying to connect to (no longer
511 supported) v2 onion services. Closes ticket 40373.
513 o Minor features (performance, windows):
514 - Use SRWLocks to implement locking on Windows. Replaces the
515 "critical section" locking implementation with the faster
516 SRWLocks, available since Windows Vista. Closes ticket 17927.
517 Patch by Daniel Pinto.
519 o Minor features (protocol, proxy support, defense in depth):
520 - Close HAProxy connections if they somehow manage to send us data
521 before we start reading. Closes another case of ticket 40017.
523 o Minor features (tests, portability):
524 - Port the hs_build_address.py test script to work with recent
525 versions of python. Closes ticket 40213. Patch from
528 o Minor features (vote document):
529 - Add a "stats" line to directory authority votes, to report various
530 statistics that authorities compute about the relays. This will
531 help us diagnose the network better. Closes ticket 40314.
533 o Minor bugfixes (build):
534 - The configure script now shows whether or not lzma and zstd have
535 been used, not just if the enable flag was passed in. Fixes bug
536 40236; bugfix on 0.4.3.1-alpha.
538 o Minor bugfixes (compatibility):
539 - Fix a failure in the test cases when running on the "hppa"
540 architecture, along with a related test that might fail on other
541 architectures in the future. Fixes bug 40274; bugfix
544 o Minor bugfixes (compilation):
545 - Fix a compilation warning about unused functions when building
546 with a libc that lacks the GLOB_ALTDIRFUNC constant. Fixes bug
547 40354; bugfix on 0.4.5.1-alpha. Patch by Daniel Pinto.
549 o Minor bugfixes (consensus handling):
550 - Avoid a set of bugs that could be caused by inconsistently
551 preferring an out-of-date consensus stored in a stale directory
552 cache over a more recent one stored on disk as the latest
553 consensus. Fixes bug 40375; bugfix on 0.3.1.1-alpha.
555 o Minor bugfixes (control, sandbox):
556 - Allow the control command SAVECONF to succeed when the seccomp
557 sandbox is enabled, and make SAVECONF keep only one backup file to
558 simplify implementation. Previously SAVECONF allowed a large
559 number of backup files, which made it incompatible with the
560 sandbox. Fixes bug 40317; bugfix on 0.2.5.4-alpha. Patch by
563 o Minor bugfixes (directory authorities, voting):
564 - Add a new consensus method (31) to support any future changes that
565 authorities decide to make to the value of bwweightscale or
566 maxunmeasuredbw. Previously, there was a bug that prevented the
567 authorities from parsing these consensus parameters correctly under
568 most circumstances. Fixes bug 19011; bugfix on 0.2.2.10-alpha.
570 o Minor bugfixes (ipv6):
571 - Allow non-SOCKSPorts to disable IPv4, IPv6, and PreferIPv4. Some
572 rare configurations might break, but in this case you can disable
573 NoIPv4Traffic and NoIPv6Traffic as needed. Fixes bug 33607; bugfix
574 on 0.4.1.1-alpha. Patch by Neel Chauhan.
576 o Minor bugfixes (key generation):
577 - Do not require a valid torrc when using the `--keygen` argument to
578 generate a signing key. This allows us to generate keys on systems
579 or users which may not run Tor. Fixes bug 40235; bugfix on
580 0.2.7.2-alpha. Patch by Neel Chauhan.
582 o Minor bugfixes (logging, relay):
583 - Emit a warning if an Address is found to be internal and tor can't
584 use it. Fixes bug 40290; bugfix on 0.4.5.1-alpha.
586 o Minor bugfixes (metrics port):
587 - Fix a bug that made tor try to re-bind() on an already open
588 MetricsPort every 60 seconds. Fixes bug 40370; bugfix
591 o Minor bugfixes (onion services, logging):
592 - Downgrade the severity of a few rendezvous circuit-related
593 warnings from warning to info. Fixes bug 40207; bugfix on
594 0.3.2.1-alpha. Patch by Neel Chauhan.
596 o Minor bugfixes (relay):
597 - Reduce the compression level for data streaming from HIGH to LOW.
598 This should reduce the CPU and memory burden for directory caches.
599 Fixes bug 40301; bugfix on 0.3.5.1-alpha.
601 o Minor bugfixes (testing, BSD):
602 - Fix pattern-matching errors when patterns expand to invalid paths
603 on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
606 o Code simplification and refactoring:
607 - Remove the orconn_ext_or_id_map structure and related functions.
608 (Nothing outside of unit tests used them.) Closes ticket 33383.
609 Patch by Neel Chauhan.
612 - Remove unneeded code for parsing private keys in directory
613 documents. This code was only used for client authentication in v2
614 onion services, which are now unsupported. Closes ticket 40374.
615 - As of this release, Tor no longer supports the old v2 onion
616 services. They were deprecated last July for security, and support
617 will be removed entirely later this year. We strongly encourage
618 everybody to migrate to v3 onion services. For more information,
619 see https://blog.torproject.org/v2-deprecation-timeline . Closes
620 ticket 40266. (NOTE: We accidentally released an earlier version
621 of the 0.4.6.1-alpha changelog without this entry. Sorry for
624 o Code simplification and refactoring (metrics, DoS):
625 - Move the DoS subsystem into the subsys manager, including its
626 configuration options. Closes ticket 40261.
628 o Documentation (manual):
629 - Move the ServerTransport* options to the "SERVER OPTIONS" section.
631 - Indicate that the HiddenServiceStatistics option also applies to
632 bridges. Closes ticket 40346.
633 - Move the description of BridgeRecordUsageByCountry to the section
634 "STATISTICS OPTIONS". Closes ticket 40323.
636 o Removed features (relay):
637 - Because DirPorts are only used on authorities, relays no longer
638 advertise them. Similarly, self-testing for DirPorts has been
639 disabled, since an unreachable DirPort is no reason for a relay
640 not to advertise itself. (Configuring a DirPort will still work,
641 for now.) Closes ticket 40282.
644 Changes in version 0.4.5.8 - 2021-05-10
645 Tor 0.4.5.8 fixes several bugs in earlier version, backporting fixes
646 from the 0.4.6.x series.
648 o Minor features (compatibility, Linux seccomp sandbox, backport from 0.4.6.3-rc):
649 - Add a workaround to enable the Linux sandbox to work correctly
650 with Glibc 2.33. This version of Glibc has started using the
651 fstatat() system call, which previously our sandbox did not allow.
652 Closes ticket 40382; see the ticket for a discussion of trade-offs.
654 o Minor features (compilation, backport from 0.4.6.3-rc):
655 - Make the autoconf script build correctly with autoconf versions
656 2.70 and later. Closes part of ticket 40335.
658 o Minor features (fallback directory list, backport from 0.4.6.2-alpha):
659 - Regenerate the list of fallback directories to contain a new set
660 of 200 relays. Closes ticket 40265.
662 o Minor features (geoip data):
663 - Update the geoip files to match the IPFire Location Database, as
664 retrieved on 2021/05/07.
666 o Minor features (onion services):
667 - Add warning message when connecting to now deprecated v2 onion
668 services. As announced, Tor 0.4.5.x is the last series that will
669 support v2 onions. Closes ticket 40373.
671 o Minor bugfixes (bridge, pluggable transport, backport from 0.4.6.2-alpha):
672 - Fix a regression that made it impossible start Tor using a bridge
673 line with a transport name and no fingerprint. Fixes bug 40360;
674 bugfix on 0.4.5.4-rc.
676 o Minor bugfixes (build, cross-compilation, backport from 0.4.6.3-rc):
677 - Allow a custom "ar" for cross-compilation. Our previous build
678 script had used the $AR environment variable in most places, but
679 it missed one. Fixes bug 40369; bugfix on 0.4.5.1-alpha.
681 o Minor bugfixes (channel, DoS, backport from 0.4.6.2-alpha):
682 - Fix a non-fatal BUG() message due to a too-early free of a string,
683 when listing a client connection from the DoS defenses subsystem.
684 Fixes bug 40345; bugfix on 0.4.3.4-rc.
686 o Minor bugfixes (compiler warnings, backport from 0.4.6.3-rc):
687 - Fix an indentation problem that led to a warning from GCC 11.1.1.
688 Fixes bug 40380; bugfix on 0.3.0.1-alpha.
690 o Minor bugfixes (controller, backport from 0.4.6.1-alpha):
691 - Fix a "BUG" warning that would appear when a controller chooses
692 the first hop for a circuit, and that circuit completes. Fixes bug
693 40285; bugfix on 0.3.2.1-alpha.
695 o Minor bugfixes (onion service, client, memory leak, backport from 0.4.6.3-rc):
696 - Fix a bug where an expired cached descriptor could get overwritten
697 with a new one without freeing it, leading to a memory leak. Fixes
698 bug 40356; bugfix on 0.3.5.1-alpha.
700 o Minor bugfixes (testing, BSD, backport from 0.4.6.2-alpha):
701 - Fix pattern-matching errors when patterns expand to invalid paths
702 on BSD systems. Fixes bug 40318; bugfix on 0.4.5.1-alpha. Patch by
706 Changes in version 0.3.5.14 - 2021-03-16
707 Tor 0.3.5.14 backports fixes for two important denial-of-service bugs
708 in earlier versions of Tor.
710 One of these vulnerabilities (TROVE-2021-001) would allow an attacker
711 who can send directory data to a Tor instance to force that Tor
712 instance to consume huge amounts of CPU. This is easiest to exploit
713 against authorities, since anybody can upload to them, but directory
714 caches could also exploit this vulnerability against relays or clients
715 when they download. The other vulnerability (TROVE-2021-002) only
716 affects directory authorities, and would allow an attacker to remotely
717 crash the authority with an assertion failure. Patches have already
718 been provided to the authority operators, to help ensure
721 We recommend that everybody upgrade to one of the releases that fixes
722 these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
725 This release also updates our GeoIP data source, and fixes a
728 o Major bugfixes (security, denial of service, backport from 0.4.5.7):
729 - Disable the dump_desc() function that we used to dump unparseable
730 information to disk. It was called incorrectly in several places,
731 in a way that could lead to excessive CPU usage. Fixes bug 40286;
732 bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
733 001 and CVE-2021-28089.
734 - Fix a bug in appending detached signatures to a pending consensus
735 document that could be used to crash a directory authority. Fixes
736 bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
739 o Minor features (geoip data, backport from 0.4.5.7):
740 - We have switched geoip data sources. Previously we shipped IP-to-
741 country mappings from Maxmind's GeoLite2, but in 2019 they changed
742 their licensing terms, so we were unable to update them after that
743 point. We now ship geoip files based on the IPFire Location
744 Database instead. (See https://location.ipfire.org/ for more
745 information). This release updates our geoip files to match the
746 IPFire Location Database as retrieved on 2021/03/12. Closes
749 o Removed features (mallinfo deprecated, backport from 0.4.5.7):
750 - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
754 Changes in version 0.4.4.8 - 2021-03-16
755 Tor 0.4.4.8 backports fixes for two important denial-of-service bugs
756 in earlier versions of Tor.
758 One of these vulnerabilities (TROVE-2021-001) would allow an attacker
759 who can send directory data to a Tor instance to force that Tor
760 instance to consume huge amounts of CPU. This is easiest to exploit
761 against authorities, since anybody can upload to them, but directory
762 caches could also exploit this vulnerability against relays or clients
763 when they download. The other vulnerability (TROVE-2021-002) only
764 affects directory authorities, and would allow an attacker to remotely
765 crash the authority with an assertion failure. Patches have already
766 been provided to the authority operators, to help ensure
769 We recommend that everybody upgrade to one of the releases that fixes
770 these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
773 This release also updates our GeoIP data source, and fixes a
776 o Major bugfixes (security, denial of service, backport from 0.4.5.7):
777 - Disable the dump_desc() function that we used to dump unparseable
778 information to disk. It was called incorrectly in several places,
779 in a way that could lead to excessive CPU usage. Fixes bug 40286;
780 bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
781 001 and CVE-2021-28089.
782 - Fix a bug in appending detached signatures to a pending consensus
783 document that could be used to crash a directory authority. Fixes
784 bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
787 o Minor features (geoip data, backport from 0.4.5.7):
788 - We have switched geoip data sources. Previously we shipped IP-to-
789 country mappings from Maxmind's GeoLite2, but in 2019 they changed
790 their licensing terms, so we were unable to update them after that
791 point. We now ship geoip files based on the IPFire Location
792 Database instead. (See https://location.ipfire.org/ for more
793 information). This release updates our geoip files to match the
794 IPFire Location Database as retrieved on 2021/03/12. Closes
797 o Removed features (mallinfo deprecated, backport from 0.4.5.7):
798 - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
802 Changes in version 0.4.5.7 - 2021-03-16
803 Tor 0.4.5.7 fixes two important denial-of-service bugs in earlier
806 One of these vulnerabilities (TROVE-2021-001) would allow an attacker
807 who can send directory data to a Tor instance to force that Tor
808 instance to consume huge amounts of CPU. This is easiest to exploit
809 against authorities, since anybody can upload to them, but directory
810 caches could also exploit this vulnerability against relays or clients
811 when they download. The other vulnerability (TROVE-2021-002) only
812 affects directory authorities, and would allow an attacker to remotely
813 crash the authority with an assertion failure. Patches have already
814 been provided to the authority operators, to help ensure
817 We recommend that everybody upgrade to one of the releases that fixes
818 these issues (0.3.5.14, 0.4.4.8, or 0.4.5.7) as they become available
821 This release also updates our GeoIP data source, and fixes a few
822 smaller bugs in earlier releases.
824 o Major bugfixes (security, denial of service):
825 - Disable the dump_desc() function that we used to dump unparseable
826 information to disk. It was called incorrectly in several places,
827 in a way that could lead to excessive CPU usage. Fixes bug 40286;
828 bugfix on 0.2.2.1-alpha. This bug is also tracked as TROVE-2021-
829 001 and CVE-2021-28089.
830 - Fix a bug in appending detached signatures to a pending consensus
831 document that could be used to crash a directory authority. Fixes
832 bug 40316; bugfix on 0.2.2.6-alpha. Tracked as TROVE-2021-002
835 o Minor features (geoip data):
836 - We have switched geoip data sources. Previously we shipped IP-to-
837 country mappings from Maxmind's GeoLite2, but in 2019 they changed
838 their licensing terms, so we were unable to update them after that
839 point. We now ship geoip files based on the IPFire Location
840 Database instead. (See https://location.ipfire.org/ for more
841 information). This release updates our geoip files to match the
842 IPFire Location Database as retrieved on 2021/03/12. Closes
845 o Minor bugfixes (directory authority):
846 - Now that exit relays don't allow exit connections to directory
847 authority DirPorts (to prevent network reentry), disable
848 authorities' reachability self test on the DirPort. Fixes bug
849 40287; bugfix on 0.4.5.5-rc.
851 o Minor bugfixes (documentation):
852 - Fix a formatting error in the documentation for
853 VirtualAddrNetworkIPv6. Fixes bug 40256; bugfix on 0.2.9.4-alpha.
855 o Minor bugfixes (Linux, relay):
856 - Fix a bug in determining total available system memory that would
857 have been triggered if the format of Linux's /proc/meminfo file
858 had ever changed to include "MemTotal:" in the middle of a line.
859 Fixes bug 40315; bugfix on 0.2.5.4-alpha.
861 o Minor bugfixes (metrics port):
862 - Fix a BUG() warning on the MetricsPort for an internal missing
863 handler. Fixes bug 40295; bugfix on 0.4.5.1-alpha.
865 o Minor bugfixes (onion service):
866 - Remove a harmless BUG() warning when reloading tor configured with
867 onion services. Fixes bug 40334; bugfix on 0.4.5.1-alpha.
869 o Minor bugfixes (portability):
870 - Fix a non-portable usage of "==" with "test" in the configure
871 script. Fixes bug 40298; bugfix on 0.4.5.1-alpha.
873 o Minor bugfixes (relay):
874 - Remove a spammy log notice falsely claiming that the IPv4/v6
875 address was missing. Fixes bug 40300; bugfix on 0.4.5.1-alpha.
876 - Do not query the address cache early in the boot process when
877 deciding if a relay needs to fetch early directory information
878 from an authority. This bug resulted in a relay falsely believing
879 it didn't have an address and thus triggering an authority fetch
880 at each boot. Related to our fix for 40300.
882 o Removed features (mallinfo deprecated):
883 - Remove mallinfo() usage entirely. Libc 2.33+ now deprecates it.
887 Changes in version 0.4.5.6 - 2021-02-15
888 The Tor 0.4.5.x release series is dedicated to the memory of Karsten
889 Loesing (1979-2020), Tor developer, cypherpunk, husband, and father.
890 Karsten is best known for creating the Tor metrics portal and leading
891 the metrics team, but he was involved in Tor from the early days. For
892 example, while he was still a student he invented and implemented the
893 v2 onion service directory design, and he also served as an ambassador
894 to the many German researchers working in the anonymity field. We
895 loved him and respected him for his patience, his consistency, and his
896 welcoming approach to growing our community.
898 This release series introduces significant improvements in relay IPv6
899 address discovery, a new "MetricsPort" mechanism for relay operators
900 to measure performance, LTTng support, build system improvements to
901 help when using Tor as a static library, and significant bugfixes
902 related to Windows relay performance. It also includes numerous
903 smaller features and bugfixes.
905 Below are the changes since 0.4.4.7. For a list of changes since
906 0.4.5.5-rc, see the ChangeLog file.
908 o Major features (build):
909 - When building Tor, first link all object files into a single
910 static library. This may help with embedding Tor in other
911 programs. Note that most Tor functions do not constitute a part of
912 a stable or supported API: only those functions in tor_api.h
913 should be used if embedding Tor. Closes ticket 40127.
915 o Major features (metrics):
916 - Introduce a new MetricsPort which exposes, through an HTTP
917 interface, a series of metrics that tor collects at runtime. At
918 the moment, the only supported output format is Prometheus data
919 model. Closes ticket 40063. See the manual page for more
920 information and security considerations.
922 o Major features (relay, IPv6):
923 - The torrc option Address now supports IPv6. This unifies our
924 address discovery interface to support IPv4, IPv6, and hostnames.
926 - Launch IPv4 and IPv6 ORPort self-test circuits on relays and
927 bridges. Closes ticket 33222.
928 - Relays now automatically bind on IPv6 for their ORPort, unless
929 specified otherwise with the IPv4Only flag. Closes ticket 33246.
930 - When a relay with IPv6 support is told to open a connection to
931 another relay, and the extend cell lists both IPv4 and IPv6
932 addresses, the first relay now picks randomly which address to
933 use. Closes ticket 33220.
934 - Relays now track their IPv6 ORPort reachability separately from
935 the reachability of their IPv4 ORPort. They will not publish a
936 descriptor unless _both_ ports appear to be externally reachable.
939 o Major features (tracing):
940 - Add event-tracing library support for USDT and LTTng-UST, and a
941 few tracepoints in the circuit subsystem. More will come
942 incrementally. This feature is compiled out by default: it needs
943 to be enabled at configure time. See documentation in
944 doc/HACKING/Tracing.md. Closes ticket 32910.
946 o Major bugfixes (directory cache, performance, windows):
947 - Limit the number of items in the consensus diff cache to 64 on
948 Windows. We hope this will mitigate an issue where Windows relay
949 operators reported Tor using 100% CPU, while we investigate better
950 solutions. Fixes bug 24857; bugfix on 0.3.1.1-alpha.
952 o Major bugfixes (relay, windows):
953 - Fix a bug in our implementation of condition variables on Windows.
954 Previously, a relay on Windows would use 100% CPU after running
955 for some time. Because of this change, Tor now require Windows
956 Vista or later to build and run. Fixes bug 30187; bugfix on
957 0.2.6.3-alpha. (This bug became more serious in 0.3.1.1-alpha with
958 the introduction of consensus diffs.) Patch by Daniel Pinto.
960 o Major bugfixes (TLS, buffer):
961 - When attempting to read N bytes on a TLS connection, really try to
962 read all N bytes. Previously, Tor would stop reading after the
963 first TLS record, which can be smaller than the N bytes requested,
964 and not check for more data until the next mainloop event. Fixes
965 bug 40006; bugfix on 0.1.0.5-rc.
967 o Minor features (address discovery):
968 - If no Address statements are found, relays now prioritize guessing
969 their address by looking at the local interface instead of the
970 local hostname. If the interface address can't be found, the local
971 hostname is used. Closes ticket 33238.
973 o Minor features (admin tools):
974 - Add a new --format argument to -key-expiration option to allow
975 specifying the time format of the expiration date. Adds Unix
976 timestamp format support. Patch by Daniel Pinto. Closes
979 o Minor features (authority, logging):
980 - Log more information for directory authority operators during the
981 consensus voting process, and while processing relay descriptors.
984 o Minor features (bootstrap reporting):
985 - When reporting bootstrapping status on a relay, do not consider
986 connections that have never been the target of an origin circuit.
987 Previously, all connection failures were treated as potential
988 bootstrapping failures, including connections that had been opened
989 because of client requests. Closes ticket 25061.
991 o Minor features (build):
992 - When running the configure script, try to detect version
993 mismatches between the OpenSSL headers and libraries, and suggest
994 that the user should try "--with-openssl-dir". Closes 40138.
995 - If the configure script has given any warnings, remind the user
996 about them at the end of the script. Related to 40138.
998 o Minor features (configuration):
999 - Allow using wildcards (* and ?) with the %include option on
1000 configuration files. Closes ticket 25140. Patch by Daniel Pinto.
1001 - Allow the configuration options EntryNodes, ExcludeNodes,
1002 ExcludeExitNodes, ExitNodes, MiddleNodes, HSLayer2Nodes and
1003 HSLayer3Nodes to be specified multiple times. Closes ticket 28361.
1004 Patch by Daniel Pinto.
1006 o Minor features (control port):
1007 - Add a DROPTIMEOUTS command to drop circuit build timeout history
1008 and reset the current timeout. Closes ticket 40002.
1009 - When a stream enters the AP_CONN_STATE_CONTROLLER_WAIT status,
1010 send a control port event. Closes ticket 32190. Patch by
1012 - Introduce GETINFO "stats/ntor/{assigned/requested}" and
1013 "stats/tap/{assigned/requested}" to get the NTor and TAP circuit
1014 onion handshake counts respectively. Closes ticket 28279. Patch by
1017 o Minor features (control port, IPv6):
1018 - Tor relays now try to report to the controller when they are
1019 launching an IPv6 self-test. Closes ticket 34068.
1020 - Introduce "GETINFO address/v4" and "GETINFO address/v6" in the
1021 control port to fetch the Tor host's respective IPv4 or IPv6
1022 address. We keep "GETINFO address" for backwards-compatibility.
1023 Closes ticket 40039. Patch by Neel Chauhan.
1025 o Minor features (directory authorities):
1026 - Add a new consensus method 30 that removes the unnecessary "="
1027 padding from ntor-onion-key. Closes ticket 7869. Patch by
1029 - Directory authorities now reject descriptors from relays running
1030 Tor versions from the obsolete 0.4.1 series. Resolves ticket
1031 34357. Patch by Neel Chauhan.
1032 - The AssumeReachable option no longer stops directory authorities
1033 from checking whether other relays are running. A new
1034 AuthDirTestReachability option can be used to disable these
1035 checks. Closes ticket 34445.
1036 - When looking for possible Sybil attacks, also consider IPv6
1037 addresses. Two routers are considered to have "the same" address
1038 by this metric if they are in the same /64 network. Patch from
1039 Maurice Pibouin. Closes ticket 7193.
1041 o Minor features (directory authorities, IPv6):
1042 - Make authorities add their IPv6 ORPort (if any) to the trusted
1043 servers list. Authorities previously added only their IPv4
1044 addresses. Closes ticket 32822.
1046 o Minor features (documentation):
1047 - Mention the "!badexit" directive that can appear in an authority's
1048 approved-routers file, and update the description of the
1049 "!invalid" directive. Closes ticket 40188.
1051 o Minor features (ed25519, relay):
1052 - Save a relay's base64-encoded ed25519 identity key to the data
1053 directory in a file named fingerprint-ed25519. Closes ticket
1054 30642. Patch by Neel Chauhan.
1056 o Minor features (heartbeat):
1057 - Include the total number of inbound and outbound IPv4 and IPv6
1058 connections in the heartbeat message. Closes ticket 29113.
1060 o Minor features (IPv6, ExcludeNodes):
1061 - Handle IPv6 addresses in ExcludeNodes; previously they were
1062 ignored. Closes ticket 34065. Patch by Neel Chauhan.
1064 o Minor features (logging):
1065 - Add the running glibc version to the log, and the compiled glibc
1066 version to the library list returned when using --library-versions.
1067 Patch from Daniel Pinto. Closes ticket 40047.
1068 - Consider an HTTP 301 response to be an error (like a 404) when
1069 processing a directory response. Closes ticket 40053.
1070 - Log directory fetch statistics as a single line. Closes
1072 - Provide more complete descriptions of our connections when logging
1073 about them. Closes ticket 40041.
1074 - When describing a relay in the logs, we now include its ed25519
1075 identity. Closes ticket 22668.
1077 o Minor features (onion services):
1078 - Only overwrite an onion service's existing hostname file if its
1079 contents are wrong. This enables read-only onion-service
1080 directories. Resolves ticket 40062. Patch by Neel Chauhan.
1082 o Minor features (pluggable transports):
1083 - Add an OutboundBindAddressPT option to allow users to specify
1084 which IPv4 and IPv6 address pluggable transports should use for
1085 outgoing IP packets. Tor does not have a way to enforce that the
1086 pluggable transport honors this option, so each pluggable transport
1087 needs to implement support on its own. Closes ticket 5304.
1089 o Minor features (protocol, proxy support, defense in depth):
1090 - Respond more deliberately to misbehaving proxies that leave
1091 leftover data on their connections, so as to make Tor even less
1092 likely to allow the proxies to pass their data off as having come
1093 from a relay. Closes ticket 40017.
1095 o Minor features (relay address tracking):
1096 - We now store relay addresses for OR connections in a more logical
1097 way. Previously we would sometimes overwrite the actual address of
1098 a connection with a "canonical address", and then store the "real
1099 address" elsewhere to remember it. We now track the "canonical
1100 address" elsewhere for the cases where we need it, and leave the
1101 connection's address alone. Closes ticket 33898.
1103 o Minor features (relay):
1104 - If a relay is unable to discover its address, attempt to learn it
1105 from the NETINFO cell. Closes ticket 40022.
1106 - Log immediately when launching a relay self-check. Previously we
1107 would try to log before launching checks, or approximately when we
1108 intended to launch checks, but this tended to be error-prone.
1109 Closes ticket 34137.
1111 o Minor features (relay, address discovery):
1112 - If Address option is not found in torrc, attempt to learn our
1113 address with the configured ORPort address if any. Closes
1116 o Minor features (relay, IPv6):
1117 - Add an AssumeReachableIPv6 option to disable self-checking IPv6
1118 reachability. Closes part of ticket 33224.
1119 - Add new "assume-reachable" and "assume-reachable-ipv6" consensus
1120 parameters to be used in an emergency to tell relays that they
1121 should publish even if they cannot complete their ORPort self-
1122 checks. Closes ticket 34064 and part of 33224.
1123 - Allow relays to send IPv6-only extend cells. Closes ticket 33222.
1124 - Declare support for the Relay=3 subprotocol version. Closes
1126 - When launching IPv6 ORPort self-test circuits, make sure that the
1127 second-last hop can initiate an IPv6 extend. Closes ticket 33222.
1129 o Minor features (safety):
1130 - Log a warning at startup if Tor is built with compile-time options
1131 that are likely to make it less stable or reliable. Closes
1134 o Minor features (specification update):
1135 - Several fields in microdescriptors, router descriptors, and
1136 consensus documents that were formerly optional are now required.
1137 Implements proposal 315; closes ticket 40132.
1139 o Minor features (state management):
1140 - When loading the state file, remove entries from the statefile
1141 that have been obsolete for a long time. Ordinarily Tor preserves
1142 unrecognized entries in order to keep forward-compatibility, but
1143 these entries have not actually been used in any release since
1144 before 0.3.5.x. Closes ticket 40137.
1146 o Minor features (statistics, ipv6):
1147 - Relays now publish IPv6-specific counts of single-direction versus
1148 bidirectional relay connections. Closes ticket 33264.
1149 - Relays now publish their IPv6 read and write statistics over time,
1150 if statistics are enabled. Closes ticket 33263.
1152 o Minor features (subprotocol versions):
1153 - Use the new limitations on subprotocol versions due to proposal
1154 318 to simplify our implementation. Part of ticket 40133.
1156 o Minor features (testing configuration):
1157 - The TestingTorNetwork option no longer implicitly sets
1158 AssumeReachable to 1. This change allows us to test relays' self-
1159 testing mechanisms, and to test authorities' relay-testing
1160 functionality. Closes ticket 34446.
1162 o Minor features (testing):
1163 - Added unit tests for channel_matches_target_addr_for_extend().
1164 Closes Ticket 33919. Patch by MrSquanchee.
1166 o Minor bugfixes (circuit padding):
1167 - When circpad_send_padding_cell_for_callback is called,
1168 `is_padding_timer_scheduled` flag was not reset. Now it is set to
1169 0 at the top of that function. Fixes bug 32671; bugfix
1171 - Add a per-circuit padding machine instance counter, so we can
1172 differentiate between shutdown requests for old machines on a
1173 circuit. Fixes bug 30992; bugfix on 0.4.1.1-alpha.
1174 - Add the ability to keep circuit padding machines if they match a
1175 set of circuit states or purposes. This allows us to have machines
1176 that start up under some conditions but don't shut down under
1177 others. We now use this mask to avoid starting up introduction
1178 circuit padding again after the machines have already completed.
1179 Fixes bug 32040; bugfix on 0.4.1.1-alpha.
1181 o Minor bugfixes (circuit, handshake):
1182 - In the v3 handshaking code, use connection_or_change_state() to
1183 change the state. Previously, we changed the state directly, but
1184 this did not pass the state change to the pubsub or channel
1185 objects, potentially leading to bugs. Fixes bug 32880; bugfix on
1186 0.2.3.6-alpha. Patch by Neel Chauhan.
1188 o Minor bugfixes (compilation):
1189 - Change the linker flag ordering in our library search code so that
1190 it works for compilers that need the libraries to be listed in the
1191 right order. Fixes bug 33624; bugfix on 0.1.1.0-alpha.
1192 - Fix the "--enable-static-tor" switch to properly set the "-static"
1193 compile option onto the tor binary only. Fixes bug 40111; bugfix
1196 o Minor bugfixes (configuration):
1197 - Exit Tor on a misconfiguration when the Bridge line is configured
1198 to use a transport but no corresponding ClientTransportPlugin can
1199 be found. Prior to this fix, Tor would attempt to connect to the
1200 bridge directly without using the transport, making it easier for
1201 adversaries to notice the bridge. Fixes bug 25528; bugfix
1204 o Minor bugfixes (control port):
1205 - Make sure we send the SOCKS request address in relay begin cells
1206 when a stream is attached with the purpose
1207 CIRCUIT_PURPOSE_CONTROLLER. Fixes bug 33124; bugfix on 0.0.5.
1208 Patch by Neel Chauhan.
1210 o Minor bugfixes (crash, relay, signing key):
1211 - Avoid assertion failures when we run Tor from the command line
1212 with `--key-expiration sign`, but an ORPort is not set. Fixes bug
1213 40015; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
1215 o Minor bugfixes (logging):
1216 - Avoid a spurious log message about missing subprotocol versions,
1217 when the consensus that we're reading from is older than the
1218 current release. Previously we had made this message nonfatal, but
1219 in practice, it is never relevant when the consensus is older than
1220 the current release. Fixes bug 40281; bugfix on 0.4.0.1-alpha.
1221 - Remove trailing whitespace from control event log messages. Fixes
1222 bug 32178; bugfix on 0.1.1.1-alpha. Based on a patch by
1224 - Turn warning-level log message about SENDME failure into a debug-
1225 level message. (This event can happen naturally, and is no reason
1226 for concern). Fixes bug 40142; bugfix on 0.4.1.1-alpha.
1227 - When logging a rate-limited message about how many messages have
1228 been suppressed in the last N seconds, give an accurate value for
1229 N, rounded up to the nearest minute. Previously we would report
1230 the size of the rate-limiting interval, regardless of when the
1231 messages started to occur. Fixes bug 19431; bugfix
1234 o Minor bugfixes (onion services):
1235 - Avoid a non-fatal assertion in certain edge-cases when
1236 establishing a circuit to an onion service. Fixes bug 32666;
1237 bugfix on 0.3.0.3-alpha.
1239 o Minor bugfixes (rust, protocol versions):
1240 - Declare support for the onion service introduction point denial of
1241 service extensions when building with Rust. Fixes bug 34248;
1242 bugfix on 0.4.2.1-alpha.
1243 - Make Rust protocol version support checks consistent with the
1244 undocumented error behavior of the corresponding C code. Fixes bug
1245 34251; bugfix on 0.3.3.5-rc.
1247 o Minor bugfixes (self-testing):
1248 - When receiving an incoming circuit, only accept it as evidence
1249 that we are reachable if the declared address of its channel is
1250 the same address we think that we have. Otherwise, it could be
1251 evidence that we're reachable on some other address. Fixes bug
1252 20165; bugfix on 0.1.0.1-rc.
1254 o Minor bugfixes (spec conformance):
1255 - Use the correct key type when generating signing->link
1256 certificates. Fixes bug 40124; bugfix on 0.2.7.2-alpha.
1258 o Minor bugfixes (subprotocol versions):
1259 - Consistently reject extra commas, instead of only rejecting
1260 leading commas. Fixes bug 27194; bugfix on 0.2.9.4-alpha.
1261 - In summarize_protover_flags(), treat empty strings the same as
1262 NULL. This prevents protocols_known from being set. Previously, we
1263 treated empty strings as normal strings, which led to
1264 protocols_known being set. Fixes bug 34232; bugfix on
1265 0.3.3.2-alpha. Patch by Neel Chauhan.
1267 o Code simplification and refactoring:
1268 - Add and use a set of functions to perform down-casts on constant
1269 connection and channel pointers. Closes ticket 40046.
1270 - Refactor our code that logs descriptions of connections, channels,
1271 and the peers on them, to use a single call path. This change
1272 enables us to refactor the data types that they use, and eliminates
1273 many confusing usages of those types. Closes ticket 40041.
1274 - Refactor some common node selection code into a single function.
1275 Closes ticket 34200.
1276 - Remove the now-redundant 'outbuf_flushlen' field from our
1277 connection type. It was previously used for an older version of
1278 our rate-limiting logic. Closes ticket 33097.
1279 - Rename "fascist_firewall_*" identifiers to "reachable_addr_*"
1280 instead, for consistency with other code. Closes ticket 18106.
1281 - Rename functions about "advertised" ports which are not in fact
1282 guaranteed to return the ports that have been advertised. Closes
1284 - Split implementation of several command line options from
1285 options_init_from_torrc into smaller isolated functions. Patch by
1286 Daniel Pinto. Closes ticket 40102.
1287 - When an extend cell is missing an IPv4 or IPv6 address, fill in
1288 the address from the extend info. This is similar to what was done
1289 in ticket 33633 for ed25519 keys. Closes ticket 33816. Patch by
1292 o Deprecated features:
1293 - The "non-builtin" argument to the "--dump-config" command is now
1294 deprecated. When it works, it behaves the same as "short", which
1295 you should use instead. Closes ticket 33398.
1298 - Replace URLs from our old bugtracker so that they refer to the new
1299 bugtracker and wiki. Closes ticket 40101.
1302 - We no longer ship or build a "tor.service" file for use with
1303 systemd. No distribution included this script unmodified, and we
1304 don't have the expertise ourselves to maintain this in a way that
1305 all the various systemd-based distributions can use. Closes
1307 - We no longer ship support for the Android logging API. Modern
1308 versions of Android can use the syslog API instead. Closes
1310 - The "optimistic data" feature is now always on; there is no longer
1311 an option to disable it from the torrc file or from the consensus
1312 directory. Closes part of 40139.
1313 - The "usecreatefast" network parameter is now removed; there is no
1314 longer an option for authorities to turn it off. Closes part
1318 - Add unit tests for bandwidth statistics manipulation functions.
1319 Closes ticket 33812. Patch by MrSquanchee.
1321 o Code simplification and refactoring (autoconf):
1322 - Remove autoconf checks for unused funcs and headers. Closes ticket
1323 31699; Patch by @bduszel
1325 o Code simplification and refactoring (maintainer scripts):
1326 - Disable by default the pre-commit hook. Use the environment
1327 variable TOR_EXTRA_PRE_COMMIT_CHECKS in order to run it.
1328 Furthermore, stop running practracker in the pre-commit hook and
1329 make check-local. Closes ticket 40019.
1331 o Code simplification and refactoring (relay address):
1332 - Most of IPv4 representation was using "uint32_t". It has now been
1333 moved to use the internal "tor_addr_t" interface instead. This is
1334 so we can properly integrate IPv6 along IPv4 with common
1335 interfaces. Closes ticket 40043.
1337 o Documentation (manual page):
1338 - Move them from doc/ to doc/man/. Closes ticket 40044.
1339 - Describe the status of the "Sandbox" option more accurately. It is
1340 no longer "experimental", but it _is_ dependent on kernel and libc
1341 versions. Closes ticket 23378.
1343 o Documentation (tracing):
1344 - Document in depth the circuit subsystem trace events in the new
1345 doc/tracing/EventsCircuit.md. Closes ticket 40036.
1347 o Removed features (controller):
1348 - Remove the "GETINFO network-status" controller command. It has
1349 been deprecated since 0.3.1.1-alpha. Closes ticket 22473.
1352 Changes in version 0.4.4.7 - 2021-02-03
1353 Tor 0.4.4.7 backports numerous bugfixes from later releases,
1354 including one that made v3 onion services more susceptible to
1355 denial-of-service attacks, and a feature that makes some kinds of
1356 DoS attacks harder to perform.
1358 o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
1359 - Stop requiring a live consensus for v3 clients and services, and
1360 allow a "reasonably live" consensus instead. This allows v3 onion
1361 services to work even if the authorities fail to generate a
1362 consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
1365 o Major feature (exit, backport from 0.4.5.5-rc):
1366 - Re-entry into the network is now denied at the Exit level to all
1367 relays' ORPorts and authorities' ORPorts and DirPorts. This change
1368 should help mitgate a set of denial-of-service attacks. Closes
1371 o Minor feature (build system, backport from 0.4.5.4-rc):
1372 - New "make lsp" command to generate the compile_commands.json file
1373 used by the ccls language server. The "bear" program is needed for
1374 this. Closes ticket 40227.
1376 o Minor features (compilation, backport from 0.4.5.2-rc):
1377 - Disable deprecation warnings when building with OpenSSL 3.0.0 or
1378 later. There are a number of APIs newly deprecated in OpenSSL
1379 3.0.0 that Tor still requires. (A later version of Tor will try to
1380 stop depending on these APIs.) Closes ticket 40165.
1382 o Minor features (crypto, backport from 0.4.5.3-rc):
1383 - Fix undefined behavior on our Keccak library. The bug only
1384 appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
1385 and would result in wrong digests. Fixes bug 40210; bugfix on
1386 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
1387 weasel for diagnosing this.
1389 o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
1390 - Strip '\r' characters when reading text files on Unix platforms.
1391 This should resolve an issue where a relay operator migrates a
1392 relay from Windows to Unix, but does not change the line ending of
1393 Tor's various state files to match the platform, and the CRLF line
1394 endings from Windows end up leaking into other files such as the
1395 extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
1397 o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
1398 - Fix a compilation warning about unreachable fallthrough
1399 annotations when building with "--enable-all-bugs-are-fatal" on
1400 some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
1402 o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
1403 - Handle partial SOCKS5 messages correctly. Previously, our code
1404 would send an incorrect error message if it got a SOCKS5 request
1405 that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
1407 o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
1408 - Fix the `config/parse_tcp_proxy_line` test so that it works
1409 correctly on systems where the DNS provider hijacks invalid
1410 queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
1411 - Fix our Python reference-implementation for the v3 onion service
1412 handshake so that it works correctly with the version of hashlib
1413 provided by Python 3.9. Fixes part of bug 40179; bugfix
1415 - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
1416 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
1419 Changes in version 0.4.3.8 - 2021-02-03
1420 Tor 0.4.3.8 backports numerous bugfixes from later releases,
1421 including one that made v3 onion services more susceptible to
1422 denial-of-service attacks, and a feature that makes some kinds of
1423 DoS attacks harder to perform.
1425 Note that this is, in all likelihood, the last release of Tor 0.4.3.x,
1426 which will reach end-of-life on 15 Feb 2021.
1428 o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
1429 - Stop requiring a live consensus for v3 clients and services, and
1430 allow a "reasonably live" consensus instead. This allows v3 onion
1431 services to work even if the authorities fail to generate a
1432 consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
1435 o Major bugfixes (stats, onion services, backport from 0.4.4.5):
1436 - Fix a bug where we were undercounting the Tor network's total
1437 onion service traffic, by ignoring any traffic originating from
1438 clients. Now we count traffic from both clients and services.
1439 Fixes bug 40117; bugfix on 0.2.6.2-alpha.
1441 o Major feature (exit, backport from 0.4.5.5-rc):
1442 - Re-entry into the network is now denied at the Exit level to all
1443 relays' ORPorts and authorities' ORPorts and DirPorts. This change
1444 should help mitgate a set of denial-of-service attacks. Closes
1447 o Minor feature (build system, backport from 0.4.5.4-rc):
1448 - New "make lsp" command to generate the compile_commands.json file
1449 used by the ccls language server. The "bear" program is needed for
1450 this. Closes ticket 40227.
1452 o Minor features (compilation, backport from 0.4.5.2-rc):
1453 - Disable deprecation warnings when building with OpenSSL 3.0.0 or
1454 later. There are a number of APIs newly deprecated in OpenSSL
1455 3.0.0 that Tor still requires. (A later version of Tor will try to
1456 stop depending on these APIs.) Closes ticket 40165.
1458 o Minor features (crypto, backport from 0.4.5.3-rc):
1459 - Fix undefined behavior on our Keccak library. The bug only
1460 appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
1461 and would result in wrong digests. Fixes bug 40210; bugfix on
1462 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
1463 weasel for diagnosing this.
1465 o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
1466 - Strip '\r' characters when reading text files on Unix platforms.
1467 This should resolve an issue where a relay operator migrates a
1468 relay from Windows to Unix, but does not change the line ending of
1469 Tor's various state files to match the platform, and the CRLF line
1470 endings from Windows end up leaking into other files such as the
1471 extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
1473 o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
1474 - Resolve a compilation warning that could occur in
1475 test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
1477 o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
1478 - Fix a compilation warning about unreachable fallthrough
1479 annotations when building with "--enable-all-bugs-are-fatal" on
1480 some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
1482 o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
1483 - Handle partial SOCKS5 messages correctly. Previously, our code
1484 would send an incorrect error message if it got a SOCKS5 request
1485 that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
1487 o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
1488 - Fix the `config/parse_tcp_proxy_line` test so that it works
1489 correctly on systems where the DNS provider hijacks invalid
1490 queries. Fixes part of bug 40179; bugfix on 0.4.3.1-alpha.
1491 - Fix our Python reference-implementation for the v3 onion service
1492 handshake so that it works correctly with the version of hashlib
1493 provided by Python 3.9. Fixes part of bug 40179; bugfix
1495 - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
1496 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
1499 Changes in version 0.3.5.13 - 2020-02-03
1500 Tor 0.3.5.13 backports numerous bugfixes from later releases,
1501 including one that made v3 onion services more susceptible to
1502 denial-of-service attacks, and a feature that makes some kinds of
1503 DoS attacks harder to perform.
1505 o Major bugfixes (onion service v3, backport from 0.4.5.3-rc):
1506 - Stop requiring a live consensus for v3 clients and services, and
1507 allow a "reasonably live" consensus instead. This allows v3 onion
1508 services to work even if the authorities fail to generate a
1509 consensus for more than 2 hours in a row. Fixes bug 40237; bugfix
1512 o Major bugfixes (stats, onion services, backport from 0.4.4.5):
1513 - Fix a bug where we were undercounting the Tor network's total
1514 onion service traffic, by ignoring any traffic originating from
1515 clients. Now we count traffic from both clients and services.
1516 Fixes bug 40117; bugfix on 0.2.6.2-alpha.
1518 o Major feature (exit, backport from 0.4.5.5-rc):
1519 - Re-entry into the network is now denied at the Exit level to all
1520 relays' ORPorts and authorities' ORPorts and DirPorts. This change
1521 should help mitgate a set of denial-of-service attacks. Closes
1524 o Minor feature (build system, backport from 0.4.5.4-rc):
1525 - New "make lsp" command to generate the compile_commands.json file
1526 used by the ccls language server. The "bear" program is needed for
1527 this. Closes ticket 40227.
1529 o Minor features (compilation, backport from 0.4.5.2-rc):
1530 - Disable deprecation warnings when building with OpenSSL 3.0.0 or
1531 later. There are a number of APIs newly deprecated in OpenSSL
1532 3.0.0 that Tor still requires. (A later version of Tor will try to
1533 stop depending on these APIs.) Closes ticket 40165.
1535 o Minor features (crypto, backport from 0.4.5.3-rc):
1536 - Fix undefined behavior on our Keccak library. The bug only
1537 appeared on platforms with 32-byte CPU cache lines (e.g. armv5tel)
1538 and would result in wrong digests. Fixes bug 40210; bugfix on
1539 0.2.8.1-alpha. Thanks to Bernhard Übelacker, Arnd Bergmann and
1540 weasel for diagnosing this.
1542 o Minor bugfixes (compatibility, backport from 0.4.5.1-rc):
1543 - Strip '\r' characters when reading text files on Unix platforms.
1544 This should resolve an issue where a relay operator migrates a
1545 relay from Windows to Unix, but does not change the line ending of
1546 Tor's various state files to match the platform, and the CRLF line
1547 endings from Windows end up leaking into other files such as the
1548 extra-info document. Fixes bug 33781; bugfix on 0.0.9pre5.
1550 o Minor bugfixes (compilation, backport from 0.4.5.1-rc):
1551 - Resolve a compilation warning that could occur in
1552 test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
1554 o Minor bugfixes (compilation, backport from 0.4.5.3-rc):
1555 - Fix a compilation warning about unreachable fallthrough
1556 annotations when building with "--enable-all-bugs-are-fatal" on
1557 some compilers. Fixes bug 40241; bugfix on 0.3.5.4-alpha.
1559 o Minor bugfixes (SOCKS5, backport from 0.4.5.3-rc):
1560 - Handle partial SOCKS5 messages correctly. Previously, our code
1561 would send an incorrect error message if it got a SOCKS5 request
1562 that wasn't complete. Fixes bug 40190; bugfix on 0.3.5.1-alpha.
1564 o Minor bugfixes (testing, backport from 0.4.5.2-alpha):
1565 - Fix our Python reference-implementation for the v3 onion service
1566 handshake so that it works correctly with the version of hashlib
1567 provided by Python 3.9. Fixes part of bug 40179; bugfix
1569 - Fix the `tortls/openssl/log_one_error` test to work with OpenSSL
1570 3.0.0. Fixes bug 40170; bugfix on 0.2.8.1-alpha.
1573 Changes in version 0.4.4.6 - 2020-11-12
1574 Tor 0.4.4.6 is the second stable release in the 0.4.4.x series. It
1575 backports fixes from later releases, including a fix for TROVE-2020-
1576 005, a security issue that could be used, under certain cases, by an
1577 adversary to observe traffic patterns on a limited number of circuits
1578 intended for a different relay.
1580 o Major bugfixes (security, backport from 0.4.5.1-alpha):
1581 - When completing a channel, relays now check more thoroughly to
1582 make sure that it matches any pending circuits before attaching
1583 those circuits. Previously, address correctness and Ed25519
1584 identities were not checked in this case, but only when extending
1585 circuits on an existing channel. Fixes bug 40080; bugfix on
1586 0.2.7.2-alpha. Resolves TROVE-2020-005.
1588 o Minor features (directory authorities, backport from 0.4.5.1-alpha):
1589 - Authorities now list a different set of protocols as required and
1590 recommended. These lists have been chosen so that only truly
1591 recommended and/or required protocols are included, and so that
1592 clients using 0.2.9 or later will continue to work (even though
1593 they are not supported), whereas only relays running 0.3.5 or
1594 later will meet the requirements. Closes ticket 40162.
1595 - Make it possible to specify multiple ConsensusParams torrc lines.
1596 Now directory authority operators can for example put the main
1597 ConsensusParams config in one torrc file and then add to it from a
1598 different torrc file. Closes ticket 40164.
1600 o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
1601 - Tor no longer allows subprotocol versions larger than 63.
1602 Previously version numbers up to UINT32_MAX were allowed, which
1603 significantly complicated our code. Implements proposal 318;
1604 closes ticket 40133.
1606 o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
1607 - Fix a rendezvous cache unit test that was triggering an underflow
1608 on the global rend cache allocation. Fixes bug 40125; bugfix
1610 - Fix another rendezvous cache unit test that was triggering an
1611 underflow on the global rend cache allocation. Fixes bug 40126;
1612 bugfix on 0.2.8.1-alpha.
1614 o Minor bugfixes (compilation, backport from 0.4.5.1-alpha):
1615 - Fix compiler warnings that would occur when building with
1616 "--enable-all-bugs-are-fatal" and "--disable-module-relay" at the
1617 same time. Fixes bug 40129; bugfix on 0.4.4.1-alpha.
1618 - Resolve a compilation warning that could occur in
1619 test_connection.c. Fixes bug 40113; bugfix on 0.2.9.3-alpha.
1621 o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
1622 - Remove a debug logging statement that uselessly spammed the logs.
1623 Fixes bug 40135; bugfix on 0.3.5.0-alpha.
1625 o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
1626 - Avoid a fatal assert() when failing to create a listener
1627 connection for an address that was in use. Fixes bug 40073; bugfix
1630 o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
1631 - For HSFETCH commands on v2 onion services addresses, check the
1632 length of bytes decoded, not the base32 length. Fixes bug 34400;
1633 bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
1636 Changes in version 0.4.3.7 - 2020-11-12
1637 Tor 0.4.3.7 backports several bugfixes from later releases. It
1638 includes a fix for TROVE-2020-005, a security issue that could be
1639 used, under certain cases, by an adversary to observe traffic patterns
1640 on a limited number of circuits intended for a different relay.
1642 Please be aware that support for the 0.4.3.x series will end on 15
1643 February 2021. Please upgrade to 0.4.4.x or 0.4.5.x before then, or
1644 downgrade to 0.3.5.x, which will be supported until at least 1
1647 o Major features (fallback directory list, backport form 0.4.4.3-alpha):
1648 - Replace the 148 fallback directories originally included in Tor
1649 0.4.1.4-rc (of which around 105 are still functional) with a list
1650 of 144 fallbacks generated in July 2020. Closes ticket 40061.
1652 o Major bugfixes (security, backport from 0.4.5.1-alpha):
1653 - When completing a channel, relays now check more thoroughly to
1654 make sure that it matches any pending circuits before attaching
1655 those circuits. Previously, address correctness and Ed25519
1656 identities were not checked in this case, but only when extending
1657 circuits on an existing channel. Fixes bug 40080; bugfix on
1658 0.2.7.2-alpha. Resolves TROVE-2020-005.
1660 o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
1661 - When running with NSS enabled, make sure that NSS knows to expect
1662 nonblocking sockets. Previously, we set our TCP sockets as
1663 nonblocking, but did not tell NSS, which in turn could lead to
1664 unexpected blocking behavior. Fixes bug 40035; bugfix
1667 o Minor features (security, backport from 0.4.4.4-rc):
1668 - Channels using obsolete versions of the Tor link protocol are no
1669 longer allowed to circumvent address-canonicity checks. (This is
1670 only a minor issue, since such channels have no way to set ed25519
1671 keys, and therefore should always be rejected for circuits that
1672 specify ed25519 identities.) Closes ticket 40081.
1674 o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
1675 - Tor no longer allows subprotocol versions larger than 63.
1676 Previously version numbers up to UINT32_MAX were allowed, which
1677 significantly complicated our code. Implements proposal 318;
1678 closes ticket 40133.
1680 o Minor features (tests, backport from 0.4.4.5):
1681 - Our "make check" target now runs the unit tests in 8 parallel
1682 chunks. Doing this speeds up hardened CI builds by more than a
1683 factor of two. Closes ticket 40098.
1685 o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
1686 - Fix a rendezvous cache unit test that was triggering an underflow
1687 on the global rend cache allocation. Fixes bug 40125; bugfix
1689 - Fix another rendezvous cache unit test that was triggering an
1690 underflow on the global rend cache allocation. Fixes bug 40126;
1691 bugfix on 0.2.8.1-alpha.
1693 o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
1694 - Fix a correctness bug that could cause an assertion failure if we
1695 ever tried using the buf_move_all() function with an empty input
1696 buffer. As far as we know, no released versions of Tor do this.
1697 Fixes bug 40076; bugfix on 0.3.3.1-alpha.
1699 o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
1700 - Remove a debug logging statement that uselessly spammed the logs.
1701 Fixes bug 40135; bugfix on 0.3.5.0-alpha.
1703 o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
1704 - On a bridge, treat all connections from an ExtORPort as remote by
1705 default for the purposes of rate-limiting. Previously, bridges
1706 would treat the connection as local unless they explicitly
1707 received a "USERADDR" command. ExtORPort connections still count
1708 as local if there is a USERADDR command with an explicit local
1709 address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
1711 o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
1712 - Avoid a fatal assert() when failing to create a listener
1713 connection for an address that was in use. Fixes bug 40073; bugfix
1716 o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
1717 - Adjust the rules for when to warn about having too many
1718 connections to other relays. Previously we'd tolerate up to 1.5
1719 connections per relay on average. Now we tolerate more connections
1720 for directory authorities, and raise the number of total
1721 connections we need to see before we warn. Fixes bug 33880; bugfix
1724 o Minor bugfixes (tests, 0.4.4.5):
1725 - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
1726 on its own. Previously, it would exit with an error. Fixes bug
1727 40099; bugfix on 0.2.8.1-alpha.
1729 o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
1730 - For HSFETCH commands on v2 onion services addresses, check the
1731 length of bytes decoded, not the base32 length. Fixes bug 34400;
1732 bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
1734 o Minor bugfixes (windows, backport from 0.4.4.4-rc):
1735 - Fix a bug that prevented Tor from starting if its log file grew
1736 above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
1738 o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
1739 - Add a deprecation warning for version 2 onion services. Closes
1742 o Removed features (backport from 0.4.4.3-alpha):
1743 - Our "check-local" test target no longer tries to use the
1744 Coccinelle semantic patching tool parse all the C files. While it
1745 is a good idea to try to make sure Coccinelle works on our C
1746 before we run a Coccinelle patch, doing so on every test run has
1747 proven to be disruptive. You can still run this tool manually with
1748 "make check-cocci". Closes ticket 40030. ticket 40030.
1751 Changes in version 0.3.5.12 - 2020-11-12
1752 Tor 0.4.3.7 backports several bugfixes from later releases. It
1753 includes a fix for TROVE-2020-005, a security issue that could be
1754 used, under certain cases, by an adversary to observe traffic patterns
1755 on a limited number of circuits intended for a different relay.
1757 o Major features (fallback directory list, backport form 0.4.4.3-alpha):
1758 - Replace the 148 fallback directories originally included in Tor
1759 0.4.1.4-rc (of which around 105 are still functional) with a list
1760 of 144 fallbacks generated in July 2020. Closes ticket 40061.
1762 o Major bugfixes (security, backport from 0.4.5.1-alpha):
1763 - When completing a channel, relays now check more thoroughly to
1764 make sure that it matches any pending circuits before attaching
1765 those circuits. Previously, address correctness and Ed25519
1766 identities were not checked in this case, but only when extending
1767 circuits on an existing channel. Fixes bug 40080; bugfix on
1768 0.2.7.2-alpha. Resolves TROVE-2020-005.
1770 o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
1771 - When running with NSS enabled, make sure that NSS knows to expect
1772 nonblocking sockets. Previously, we set our TCP sockets as
1773 nonblocking, but did not tell NSS, which in turn could lead to
1774 unexpected blocking behavior. Fixes bug 40035; bugfix
1777 o Minor features (security, backport from 0.4.4.4-rc):
1778 - Channels using obsolete versions of the Tor link protocol are no
1779 longer allowed to circumvent address-canonicity checks. (This is
1780 only a minor issue, since such channels have no way to set ed25519
1781 keys, and therefore should always be rejected for circuits that
1782 specify ed25519 identities.) Closes ticket 40081.
1784 o Minor features (debugging, directory system):
1785 - Don't crash when we find a non-guard with a guard-fraction value
1786 set. Instead, log a bug warning, in an attempt to figure out how
1787 this happened. Diagnostic for ticket 32868.
1789 o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
1790 - Tor no longer allows subprotocol versions larger than 63.
1791 Previously version numbers up to UINT32_MAX were allowed, which
1792 significantly complicated our code. Implements proposal 318;
1793 closes ticket 40133.
1795 o Minor features (tests, backport from 0.4.4.5):
1796 - Our "make check" target now runs the unit tests in 8 parallel
1797 chunks. Doing this speeds up hardened CI builds by more than a
1798 factor of two. Closes ticket 40098.
1800 o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
1801 - Fix a rendezvous cache unit test that was triggering an underflow
1802 on the global rend cache allocation. Fixes bug 40125; bugfix
1804 - Fix another rendezvous cache unit test that was triggering an
1805 underflow on the global rend cache allocation. Fixes bug 40126;
1806 bugfix on 0.2.8.1-alpha.
1808 o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
1809 - Fix a correctness bug that could cause an assertion failure if we
1810 ever tried using the buf_move_all() function with an empty input
1811 buffer. As far as we know, no released versions of Tor do this.
1812 Fixes bug 40076; bugfix on 0.3.3.1-alpha.
1814 o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
1815 - Remove a debug logging statement that uselessly spammed the logs.
1816 Fixes bug 40135; bugfix on 0.3.5.0-alpha.
1818 o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
1819 - On a bridge, treat all connections from an ExtORPort as remote by
1820 default for the purposes of rate-limiting. Previously, bridges
1821 would treat the connection as local unless they explicitly
1822 received a "USERADDR" command. ExtORPort connections still count
1823 as local if there is a USERADDR command with an explicit local
1824 address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
1826 o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
1827 - Avoid a fatal assert() when failing to create a listener
1828 connection for an address that was in use. Fixes bug 40073; bugfix
1831 o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
1832 - Adjust the rules for when to warn about having too many
1833 connections to other relays. Previously we'd tolerate up to 1.5
1834 connections per relay on average. Now we tolerate more connections
1835 for directory authorities, and raise the number of total
1836 connections we need to see before we warn. Fixes bug 33880; bugfix
1839 o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
1840 - Stop advertising incorrect IPv6 ORPorts in relay and bridge
1841 descriptors, when the IPv6 port was configured as "auto". Fixes
1842 bug 32588; bugfix on 0.2.3.9-alpha.
1844 o Minor bugfixes (tests, 0.4.4.5):
1845 - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
1846 on its own. Previously, it would exit with an error. Fixes bug
1847 40099; bugfix on 0.2.8.1-alpha.
1849 o Minor bugfixes (windows, backport from 0.4.4.4-rc):
1850 - Fix a bug that prevented Tor from starting if its log file grew
1851 above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
1853 o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
1854 - Add a deprecation warning for version 2 onion services. Closes
1857 Changes in version 0.4.4.5 - 2020-09-15
1858 Tor 0.4.4.5 is the first stable release in the 0.4.4.x series. This
1859 series improves our guard selection algorithms, adds v3 onion balance
1860 support, improves the amount of code that can be disabled when running
1861 without relay support, and includes numerous small bugfixes and
1862 enhancements. It also lays the ground for some IPv6 features that
1863 we'll be developing more in the next (0.4.5) series.
1865 Per our support policy, we support each stable release series for nine
1866 months after its first stable release, or three months after the first
1867 stable release of the next series: whichever is longer. This means
1868 that 0.4.4.x will be supported until around June 2021--or later, if
1869 0.4.5.x is later than anticipated.
1871 Note also that support for 0.4.2.x has just ended; support for 0.4.3
1872 will continue until Feb 15, 2021. We still plan to continue supporting
1873 0.3.5.x, our long-term stable series, until Feb 2022.
1875 Below are the changes since 0.4.3.6-rc. For a complete list of changes
1876 since 0.4.4.4-rc, see the ChangeLog file.
1878 o Major features (Proposal 310, performance + security):
1879 - Implements Proposal 310, "Bandaid on guard selection". Proposal
1880 310 solves load-balancing issues with older versions of the guard
1881 selection algorithm, and improves its security. Under this new
1882 algorithm, a newly selected guard never becomes Primary unless all
1883 previously sampled guards are unreachable. Implements
1884 recommendation from 32088. (Proposal 310 is linked to the CLAPS
1885 project researching optimal client location-aware path selections.
1886 This project is a collaboration between the UCLouvain Crypto Group,
1887 the U.S. Naval Research Laboratory, and Princeton University.)
1889 o Major features (fallback directory list):
1890 - Replace the 148 fallback directories originally included in Tor
1891 0.4.1.4-rc (of which around 105 are still functional) with a list
1892 of 144 fallbacks generated in July 2020. Closes ticket 40061.
1894 o Major features (IPv6, relay):
1895 - Consider IPv6-only EXTEND2 cells valid on relays. Log a protocol
1896 warning if the IPv4 or IPv6 address is an internal address, and
1897 internal addresses are not allowed. But continue to use the other
1898 address, if it is valid. Closes ticket 33817.
1899 - If a relay can extend over IPv4 and IPv6, and both addresses are
1900 provided, it chooses between them uniformly at random. Closes
1902 - Re-use existing IPv6 connections for circuit extends. Closes
1904 - Relays may extend circuits over IPv6, if the relay has an IPv6
1905 ORPort, and the client supplies the other relay's IPv6 ORPort in
1906 the EXTEND2 cell. IPv6 extends will be used by the relay IPv6
1907 ORPort self-tests in 33222. Closes ticket 33817.
1909 o Major features (v3 onion services):
1910 - Allow v3 onion services to act as OnionBalance backend instances,
1911 by using the HiddenServiceOnionBalanceInstance torrc option.
1912 Closes ticket 32709.
1914 o Major bugfixes (NSS):
1915 - When running with NSS enabled, make sure that NSS knows to expect
1916 nonblocking sockets. Previously, we set our TCP sockets as
1917 nonblocking, but did not tell NSS, which in turn could lead to
1918 unexpected blocking behavior. Fixes bug 40035; bugfix
1921 o Major bugfixes (onion services, DoS):
1922 - Correct handling of parameters for the onion service DoS defense.
1923 Previously, the consensus parameters for the onion service DoS
1924 defenses were overwriting the parameters set by the service
1925 operator using HiddenServiceEnableIntroDoSDefense. Fixes bug
1926 40109; bugfix on 0.4.2.1-alpha.
1928 o Major bugfixes (stats, onion services):
1929 - Fix a bug where we were undercounting the Tor network's total
1930 onion service traffic, by ignoring any traffic originating from
1931 clients. Now we count traffic from both clients and services.
1932 Fixes bug 40117; bugfix on 0.2.6.2-alpha.
1934 o Minor features (security):
1935 - Channels using obsolete versions of the Tor link protocol are no
1936 longer allowed to circumvent address-canonicity checks. (This is
1937 only a minor issue, since such channels have no way to set ed25519
1938 keys, and therefore should always be rejected for circuits that
1939 specify ed25519 identities.) Closes ticket 40081.
1941 o Minor features (bootstrap reporting):
1942 - Report more detailed reasons for bootstrap failure when the
1943 failure happens due to a TLS error. Previously we would just call
1944 these errors "MISC" when they happened during read, and "DONE"
1945 when they happened during any other TLS operation. Closes
1948 o Minor features (client-only compilation):
1949 - Disable more code related to the ext_orport protocol when
1950 compiling without support for relay mode. Closes ticket 33368.
1951 - Disable more of our self-testing code when support for relay mode
1952 is disabled. Closes ticket 33370.
1953 - Most server-side DNS code is now disabled when building without
1954 support for relay mode. Closes ticket 33366.
1956 o Minor features (code safety):
1957 - Check for failures of tor_inet_ntop() and tor_inet_ntoa()
1958 functions in DNS and IP address processing code, and adjust
1959 codepaths to make them less likely to crash entire Tor instances.
1960 Resolves issue 33788.
1962 o Minor features (continuous integration):
1963 - Run unit-test and integration test (Stem, Chutney) jobs with
1964 ALL_BUGS_ARE_FATAL macro being enabled on Travis and Appveyor.
1965 Resolves ticket 32143.
1967 o Minor features (control port):
1968 - If a ClientName was specified in ONION_CLIENT_AUTH_ADD for an
1969 onion service, display it when we use ONION_CLIENT_AUTH_VIEW.
1970 Closes ticket 40089. Patch by Neel Chauhan.
1971 - Return a descriptive error message from the 'GETINFO status/fresh-
1972 relay-descs' command on the control port. Previously, we returned
1973 a generic error of "Error generating descriptor". Closes ticket
1974 32873. Patch by Neel Chauhan.
1976 o Minor features (defense in depth):
1977 - Wipe more data from connection address fields before returning
1978 them to the memory heap. Closes ticket 6198.
1980 o Minor features (denial-of-service memory limiter):
1981 - Allow the user to configure even lower values for the
1982 MaxMemInQueues parameter. Relays now enforce a minimum of 64 MB,
1983 when previously the minimum was 256 MB. On clients, there is no
1984 minimum. Relays and clients will both warn if the value is set so
1985 low that Tor is likely to stop working. Closes ticket 24308.
1987 o Minor features (developer tooling):
1988 - Add a script to help check the alphabetical ordering of option
1989 names in the manual page. Closes ticket 33339.
1990 - Refrain from listing all .a files that are generated by the Tor
1991 build in .gitignore. Add a single wildcard *.a entry that covers
1992 all of them for present and future. Closes ticket 33642.
1993 - Add a script ("git-install-tools.sh") to install git hooks and
1994 helper scripts. Closes ticket 33451.
1996 o Minor features (directory authority):
1997 - Authorities now recommend the protocol versions that are supported
1998 by Tor 0.3.5 and later. (Earlier versions of Tor have been
1999 deprecated since January of this year.) This recommendation will
2000 cause older clients and relays to give a warning on startup, or
2001 when they download a consensus directory. Closes ticket 32696.
2003 o Minor features (directory authority, shared random):
2004 - Refactor more authority-only parts of the shared-random scheduling
2005 code to reside in the dirauth module, and to be disabled when
2006 compiling with --disable-module-dirauth. Closes ticket 33436.
2008 o Minor features (directory):
2009 - Remember the number of bytes we have downloaded for each directory
2010 purpose while bootstrapping, and while fully bootstrapped. Log
2011 this information as part of the heartbeat message. Closes
2014 o Minor features (entry guards):
2015 - Reinstate support for GUARD NEW/UP/DOWN control port events.
2016 Closes ticket 40001.
2018 o Minor features (IPv6 support):
2019 - Adds IPv6 support to tor_addr_is_valid(). Adds tests for the above
2020 changes and tor_addr_is_null(). Closes ticket 33679. Patch
2022 - Allow clients and relays to send dual-stack and IPv6-only EXTEND2
2023 cells. Parse dual-stack and IPv6-only EXTEND2 cells on relays.
2024 Closes ticket 33901.
2026 o Minor features (linux seccomp2 sandbox, portability):
2027 - Allow Tor to build on platforms where it doesn't know how to
2028 report which syscall caused the linux seccomp2 sandbox to fail.
2029 This change should make the sandbox code more portable to less
2030 common Linux architectures. Closes ticket 34382.
2031 - Permit the unlinkat() syscall, which some Libc implementations use
2032 to implement unlink(). Closes ticket 33346.
2034 o Minor features (logging):
2035 - When trying to find our own address, add debug-level logging to
2036 report the sources of candidate addresses. Closes ticket 32888.
2038 o Minor features (onion service client, SOCKS5):
2039 - Add 3 new SocksPort ExtendedErrors (F2, F3, F7) that reports back
2040 new type of onion service connection failures. The semantics of
2041 these error codes are documented in proposal 309. Closes
2044 o Minor features (onion service v3):
2045 - If a service cannot upload its descriptor(s), log why at INFO
2046 level. Closes ticket 33400; bugfix on 0.3.2.1-alpha.
2048 o Minor features (python scripts):
2049 - Stop assuming that /usr/bin/python exists. Instead of using a
2050 hardcoded path in scripts that still use Python 2, use
2051 /usr/bin/env, similarly to the scripts that use Python 3. Fixes
2052 bug 33192; bugfix on 0.4.2.
2054 o Minor features (testing, architecture):
2055 - Our test scripts now double-check that subsystem initialization
2056 order is consistent with the inter-module dependencies established
2057 by our .may_include files. Implements ticket 31634.
2058 - Initialize all subsystems at the beginning of our unit test
2059 harness, to avoid crashes due to uninitialized subsystems. Follow-
2060 up from ticket 33316.
2061 - Our "make check" target now runs the unit tests in 8 parallel
2062 chunks. Doing this speeds up hardened CI builds by more than a
2063 factor of two. Closes ticket 40098.
2065 o Minor features (v3 onion services):
2066 - Add v3 onion service status to the dumpstats() call which is
2067 triggered by a SIGUSR1 signal. Previously, we only did v2 onion
2068 services. Closes ticket 24844. Patch by Neel Chauhan.
2070 o Minor features (windows):
2071 - Add support for console control signals like Ctrl+C in Windows.
2072 Closes ticket 34211. Patch from Damon Harris (TheDcoder).
2074 o Minor bugfixes (control port, onion service):
2075 - Consistently use 'address' in "Invalid v3 address" response to
2076 ONION_CLIENT_AUTH commands. Previously, we would sometimes say
2077 'addr'. Fixes bug 40005; bugfix on 0.4.3.1-alpha.
2079 o Minor bugfixes (correctness, buffers):
2080 - Fix a correctness bug that could cause an assertion failure if we
2081 ever tried using the buf_move_all() function with an empty input
2082 buffer. As far as we know, no released versions of Tor do this.
2083 Fixes bug 40076; bugfix on 0.3.3.1-alpha.
2085 o Minor bugfixes (directory authorities):
2086 - Directory authorities now reject votes that arrive too late. In
2087 particular, once an authority has started fetching missing votes,
2088 it no longer accepts new votes posted by other authorities. This
2089 change helps prevent a consensus split, where only some authorities
2090 have the late vote. Fixes bug 4631; bugfix on 0.2.0.5-alpha.
2092 o Minor bugfixes (git scripts):
2093 - Stop executing the checked-out pre-commit hook from the pre-push
2094 hook. Instead, execute the copy in the user's git directory. Fixes
2095 bug 33284; bugfix on 0.4.1.1-alpha.
2097 o Minor bugfixes (initialization):
2098 - Initialize the subsystems in our code in an order more closely
2099 corresponding to their dependencies, so that every system is
2100 initialized before the ones that (theoretically) depend on it.
2101 Fixes bug 33316; bugfix on 0.4.0.1-alpha.
2103 o Minor bugfixes (IPv4, relay):
2104 - Check for invalid zero IPv4 addresses and ports when sending and
2105 receiving extend cells. Fixes bug 33900; bugfix on 0.2.4.8-alpha.
2107 o Minor bugfixes (IPv6, relay):
2108 - Consider IPv6 addresses when checking if a connection is
2109 canonical. In 17604, relays assumed that a remote relay could
2110 consider an IPv6 connection canonical, but did not set the
2111 canonical flag on their side of the connection. Fixes bug 33899;
2112 bugfix on 0.3.1.1-alpha.
2113 - Log IPv6 addresses on connections where this relay is the
2114 responder. Previously, responding relays would replace the remote
2115 IPv6 address with the IPv4 address from the consensus. Fixes bug
2116 33899; bugfix on 0.3.1.1-alpha.
2118 o Minor bugfixes (linux seccomp2 sandbox):
2119 - Fix a regression on sandboxing rules for the openat() syscall. The
2120 fix for bug 25440 fixed the problem on systems with glibc >= 2.27
2121 but broke with versions of glibc. We now choose a rule based on
2122 the glibc version. Patch from Daniel Pinto. Fixes bug 27315;
2124 - Makes the seccomp sandbox allow the correct syscall for opendir
2125 according to the running glibc version. This fixes crashes when
2126 reloading torrc with sandbox enabled when running on glibc 2.15 to
2127 2.21 and 2.26. Patch from Daniel Pinto. Fixes bug 40020; bugfix
2130 o Minor bugfixes (logging, testing):
2131 - Make all of tor's assertion macros support the ALL_BUGS_ARE_FATAL
2132 and DISABLE_ASSERTS_IN_UNIT_TESTS debugging modes. (IF_BUG_ONCE()
2133 used to log a non-fatal warning, regardless of the debugging
2134 mode.) Fixes bug 33917; bugfix on 0.2.9.1-alpha.
2135 - Remove surprising empty line in the INFO-level log about circuit
2136 build timeout. Fixes bug 33531; bugfix on 0.3.3.1-alpha.
2138 o Minor bugfixes (mainloop):
2139 - Better guard against growing a buffer past its maximum 2GB in
2140 size. Fixes bug 33131; bugfix on 0.3.0.4-rc.
2142 o Minor bugfixes (onion service v3 client):
2143 - Remove a BUG() warning that could occur naturally. Fixes bug
2144 34087; bugfix on 0.3.2.1-alpha.
2146 o Minor bugfixes (onion service, logging):
2147 - Fix a typo in a log message PublishHidServDescriptors is set to 0.
2148 Fixes bug 33779; bugfix on 0.3.2.1-alpha.
2150 o Minor bugfixes (onion services v3):
2151 - Avoid a non-fatal assertion failure in certain edge-cases when
2152 opening an intro circuit as a client. Fixes bug 34084; bugfix
2155 o Minor bugfixes (protocol versions):
2156 - Sort tor's supported protocol version lists, as recommended by the
2157 tor directory specification. Fixes bug 33285; bugfix
2160 o Minor bugfixes (rate limiting, bridges, pluggable transports):
2161 - On a bridge, treat all connections from an ExtORPort as remote by
2162 default for the purposes of rate-limiting. Previously, bridges
2163 would treat the connection as local unless they explicitly
2164 received a "USERADDR" command. ExtORPort connections still count
2165 as local if there is a USERADDR command with an explicit local
2166 address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
2168 o Minor bugfixes (refactoring):
2169 - Lift circuit_build_times_disabled() out of the
2170 circuit_expire_building() loop, to save CPU time when there are
2171 many circuits open. Fixes bug 33977; bugfix on 0.3.5.9.
2173 o Minor bugfixes (relay, self-testing):
2174 - When starting up as a relay, if we haven't been able to verify
2175 that we're reachable, only launch reachability tests at most once
2176 a minute. Previously, we had been launching tests up to once a
2177 second, which was needlessly noisy. Fixes bug 40083; bugfix
2180 o Minor bugfixes (relay, usability):
2181 - Adjust the rules for when to warn about having too many
2182 connections to other relays. Previously we'd tolerate up to 1.5
2183 connections per relay on average. Now we tolerate more connections
2184 for directory authorities, and raise the number of total
2185 connections we need to see before we warn. Fixes bug 33880; bugfix
2188 o Minor bugfixes (SOCKS, onion service client):
2189 - Detect v3 onion service addresses of the wrong length when
2190 returning the F6 ExtendedErrors code. Fixes bug 33873; bugfix
2193 o Minor bugfixes (tests):
2194 - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
2195 on its own. Previously, it would exit with an error. Fixes bug
2196 40099; bugfix on 0.2.8.1-alpha.
2198 o Minor bugfixes (v3 onion services):
2199 - Remove a BUG() warning that could trigger in certain unlikely
2200 edge-cases. Fixes bug 34086; bugfix on 0.3.2.1-alpha.
2201 - Remove a BUG() that was causing a stacktrace when a descriptor
2202 changed at an unexpected time. Fixes bug 28992; bugfix
2205 o Minor bugfixes (windows):
2206 - Fix a bug that prevented Tor from starting if its log file grew
2207 above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
2209 o Code simplification and refactoring:
2210 - Define and use a new constant TOR_ADDRPORT_BUF_LEN which is like
2211 TOR_ADDR_BUF_LEN but includes enough space for an IP address,
2212 brackets, separating colon, and port number. Closes ticket 33956.
2213 Patch by Neel Chauhan.
2214 - Merge the orconn and ocirc events into the "core" subsystem, which
2215 manages or connections and origin circuits. Previously they were
2216 isolated in subsystems of their own.
2217 - Move LOG_PROTOCOL_WARN to app/config. Resolves a dependency
2218 inversion. Closes ticket 33633.
2219 - Move the circuit extend code to the relay module. Split the
2220 circuit extend function into smaller functions. Closes
2222 - Rewrite port_parse_config() to use the default port flags from
2223 port_cfg_new(). Closes ticket 32994. Patch by MrSquanchee.
2224 - Updated comments in 'scheduler.c' to reflect old code changes, and
2225 simplified the scheduler channel state change code. Closes
2227 - Refactor configuration parsing to use the new config subsystem
2228 code. Closes ticket 33014.
2229 - Move a series of functions related to address resolving into their
2230 own files. Closes ticket 33789.
2233 - Replace most http:// URLs in our code and documentation with
2234 https:// URLs. (We have left unchanged the code in src/ext/, and
2235 the text in LICENSE.) Closes ticket 31812. Patch from Jeremy Rand.
2236 - Document the limitations of using %include on config files with
2237 seccomp sandbox enabled. Fixes documentation bug 34133; bugfix on
2238 0.3.1.1-alpha. Patch by Daniel Pinto.
2241 - Our "check-local" test target no longer tries to use the
2242 Coccinelle semantic patching tool parse all the C files. While it
2243 is a good idea to try to make sure Coccinelle works on our C
2244 before we run a Coccinelle patch, doing so on every test run has
2245 proven to be disruptive. You can still run this tool manually with
2246 "make check-cocci". Closes ticket 40030.
2247 - Remove the ClientAutoIPv6ORPort option. This option attempted to
2248 randomly choose between IPv4 and IPv6 for client connections, and
2249 wasn't a true implementation of Happy Eyeballs. Often, this option
2250 failed on IPv4-only or IPv6-only connections. Closes ticket 32905.
2251 Patch by Neel Chauhan.
2252 - Stop shipping contrib/dist/rc.subr file, as it is not being used
2253 on FreeBSD anymore. Closes issue 31576.
2256 - Add a basic IPv6 test to "make test-network". This test only runs
2257 when the local machine has an IPv6 stack. Closes ticket 33300.
2258 - Add test-network-ipv4 and test-network-ipv6 jobs to the Makefile.
2259 These jobs run the IPv4-only and dual-stack chutney flavours from
2260 test-network-all. Closes ticket 33280.
2261 - Remove a redundant distcheck job. Closes ticket 33194.
2262 - Run the test-network-ipv6 Makefile target in the Travis CI IPv6
2263 chutney job. This job runs on macOS, so it's a bit slow. Closes
2265 - Sort the Travis jobs in order of speed. Putting the slowest jobs
2266 first takes full advantage of Travis job concurrency. Closes
2268 - Stop allowing the Chutney IPv6 Travis job to fail. This job was
2269 previously configured to fast_finish (which requires
2270 allow_failure), to speed up the build. Closes ticket 33195.
2271 - Test v3 onion services to tor's mixed IPv4 chutney network. And
2272 add a mixed IPv6 chutney network. These networks are used in the
2273 test-network-all, test-network-ipv4, and test-network-ipv6 make
2274 targets. Closes ticket 33334.
2275 - Use the "bridges+hs-v23" chutney network flavour in "make test-
2276 network". This test requires a recent version of chutney (mid-
2277 February 2020). Closes ticket 28208.
2278 - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
2279 tool to produce detailed diagnostic output. Closes ticket 32792.
2281 o Deprecated features (onion service v2):
2282 - Add a deprecation warning for version 2 onion services. Closes
2285 o Documentation (manual page):
2286 - Add cross reference links and a table of contents to the HTML tor
2287 manual page. Closes ticket 33369. Work by Swati Thacker as part of
2288 Google Season of Docs.
2289 - Alphabetize the Denial of Service Mitigation Options, Directory
2290 Authority Server Options, Hidden Service Options, and Testing
2291 Network Options sections of the tor(1) manual page. Closes ticket
2292 33275. Work by Swati Thacker as part of Google Season of Docs.
2293 - Refrain from mentioning nicknames in manpage section for MyFamily
2294 torrc option. Resolves issue 33417.
2295 - Updated the options set by TestingTorNetwork in the manual page.
2296 Closes ticket 33778.
2299 Changes in version 0.3.5.11 - 2020-07-09
2300 Tor 0.3.5.11 backports fixes from later tor releases, including several
2301 usability, portability, and reliability fixes.
2303 This release also fixes TROVE-2020-001, a medium-severity denial of
2304 service vulnerability affecting all versions of Tor when compiled with
2305 the NSS encryption library. (This is not the default configuration.)
2306 Using this vulnerability, an attacker could cause an affected Tor
2307 instance to crash remotely. This issue is also tracked as CVE-2020-
2308 15572. Anybody running a version of Tor built with the NSS library
2309 should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
2312 o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
2313 - Fix a crash due to an out-of-bound memory access when Tor is
2314 compiled with NSS support. Fixes bug 33119; bugfix on
2315 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
2318 o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
2319 - Fix a bug that was preventing DoS defenses from running on bridges
2320 with a pluggable transport. Previously, the DoS subsystem was not
2321 given the transport name of the client connection, thus failed to
2322 find the GeoIP cache entry for that client address. Fixes bug
2323 33491; bugfix on 0.3.3.2-alpha.
2325 o Minor features (testing, backport from 0.4.3.4-rc):
2326 - The unit tests now support a "TOR_SKIP_TESTCASES" environment
2327 variable to specify a list of space-separated test cases that
2328 should not be executed. We will use this to disable certain tests
2329 that are failing on Appveyor because of mismatched OpenSSL
2330 libraries. Part of ticket 33643.
2332 o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
2333 - Use the correct 64-bit printf format when compiling with MINGW on
2334 Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
2336 o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
2337 - Warn if the ContactInfo field is not set, and tell the relay
2338 operator that not having a ContactInfo field set might cause their
2339 relay to get rejected in the future. Fixes bug 33361; bugfix
2342 o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
2343 - Resume use of preemptively-built circuits when UseEntryGuards is set
2344 to 0. We accidentally disabled this feature with that config
2345 setting, leading to slower load times. Fixes bug 34303; bugfix
2348 o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
2349 - Avoid compiler warnings from Clang 10 related to the use of GCC-
2350 style "/* falls through */" comments. Both Clang and GCC allow
2351 __attribute__((fallthrough)) instead, so that's what we're using
2352 now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
2354 o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
2355 - Fix a compiler warning on platforms with 32-bit time_t values.
2356 Fixes bug 40028; bugfix on 0.3.2.8-rc.
2358 o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
2359 - When starting Tor any time after the first time in a process,
2360 register the thread in which it is running as the main thread.
2361 Previously, we only did this on Windows, which could lead to bugs
2362 like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
2365 o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
2366 - When reading PEM-encoded key data, tolerate CRLF line-endings even
2367 if we are not running on Windows. Previously, non-Windows hosts
2368 would reject these line-endings in certain positions, making
2369 certain key files hard to move from one host to another. Fixes bug
2370 33032; bugfix on 0.3.5.1-alpha.
2372 o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
2373 - Downgrade a noisy log message that could occur naturally when
2374 receiving an extrainfo document that we no longer want. Fixes bug
2375 16016; bugfix on 0.2.6.3-alpha.
2377 o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
2378 - Remove a BUG() warning that would cause a stack trace if an onion
2379 service descriptor was freed while we were waiting for a
2380 rendezvous circuit to complete. Fixes bug 28992; bugfix
2383 o Testing (CI, backport from 0.4.3.4-rc):
2384 - In our Appveyor Windows CI, copy required DLLs to test and app
2385 directories, before running tor's tests. This ensures that tor.exe
2386 and test*.exe use the correct version of each DLL. This fix is not
2387 required, but we hope it will avoid DLL search issues in future.
2388 Fixes bug 33673; bugfix on 0.3.4.2-alpha.
2389 - On Appveyor, skip the crypto/openssl_version test, which is
2390 failing because of a mismatched library installation. Fix
2394 Changes in version 0.4.2.8 - 2020-07-09
2395 Tor 0.4.2.8 backports various fixes from later releases, including
2396 several that affect usability and portability.
2398 This release also fixes TROVE-2020-001, a medium-severity denial of
2399 service vulnerability affecting all versions of Tor when compiled with
2400 the NSS encryption library. (This is not the default configuration.)
2401 Using this vulnerability, an attacker could cause an affected Tor
2402 instance to crash remotely. This issue is also tracked as CVE-2020-
2403 15572. Anybody running a version of Tor built with the NSS library
2404 should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
2407 o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
2408 - Fix a crash due to an out-of-bound memory access when Tor is
2409 compiled with NSS support. Fixes bug 33119; bugfix on
2410 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
2413 o Major bugfixes (DoS defenses, bridges, pluggable transport, backport from 0.4.3.4-rc):
2414 - Fix a bug that was preventing DoS defenses from running on bridges
2415 with a pluggable transport. Previously, the DoS subsystem was not
2416 given the transport name of the client connection, thus failed to
2417 find the GeoIP cache entry for that client address. Fixes bug
2418 33491; bugfix on 0.3.3.2-alpha.
2420 o Minor feature (sendme, flow control, backport form 0.4.3.4-rc):
2421 - Default to sending SENDME version 1 cells. (Clients are already
2422 sending these, because of a consensus parameter telling them to do
2423 so: this change only affects what clients would do if the
2424 consensus didn't contain a recommendation.) Closes ticket 33623.
2426 o Minor features (diagnostic, backport from 0.4.3.3-alpha):
2427 - Improve assertions and add some memory-poisoning code to try to
2428 track down possible causes of a rare crash (32564) in the EWMA
2429 code. Closes ticket 33290.
2431 o Minor features (testing, backport from 0.4.3.4-rc):
2432 - The unit tests now support a "TOR_SKIP_TESTCASES" environment
2433 variable to specify a list of space-separated test cases that
2434 should not be executed. We will use this to disable certain tests
2435 that are failing on Appveyor because of mismatched OpenSSL
2436 libraries. Part of ticket 33643.
2438 o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
2439 - Use the correct 64-bit printf format when compiling with MINGW on
2440 Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
2442 o Minor bugfix (relay, configuration, backport from 0.4.3.3-alpha):
2443 - Warn if the ContactInfo field is not set, and tell the relay
2444 operator that not having a ContactInfo field set might cause their
2445 relay to get rejected in the future. Fixes bug 33361; bugfix
2448 o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
2449 - Resume use of preemptively-built circuits when UseEntryGuards is set
2450 to 0. We accidentally disabled this feature with that config
2451 setting, leading to slower load times. Fixes bug 34303; bugfix
2454 o Minor bugfixes (compiler compatibility, backport from 0.4.3.5):
2455 - Avoid compiler warnings from Clang 10 related to the use of GCC-
2456 style "/* falls through */" comments. Both Clang and GCC allow
2457 __attribute__((fallthrough)) instead, so that's what we're using
2458 now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
2459 - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
2462 o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
2463 - Fix a compiler warning on platforms with 32-bit time_t values.
2464 Fixes bug 40028; bugfix on 0.3.2.8-rc.
2466 o Minor bugfixes (controller protocol, backport from 0.4.3.2-alpha):
2467 - When receiving "ACTIVE" or "DORMANT" signals on the control port,
2468 report them as SIGNAL events. Previously we would log a bug
2469 warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
2471 o Minor bugfixes (embedded Tor, backport from 0.4.3.1-alpha):
2472 - When starting Tor any time after the first time in a process,
2473 register the thread in which it is running as the main thread.
2474 Previously, we only did this on Windows, which could lead to bugs
2475 like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
2478 o Minor bugfixes (key portability, backport from 0.4.3.4-rc):
2479 - When reading PEM-encoded key data, tolerate CRLF line-endings even
2480 if we are not running on Windows. Previously, non-Windows hosts
2481 would reject these line-endings in certain positions, making
2482 certain key files hard to move from one host to another. Fixes bug
2483 33032; bugfix on 0.3.5.1-alpha.
2485 o Minor bugfixes (logging, backport from 0.4.3.2-rc):
2486 - When logging a bug, do not say "Future instances of this warning
2487 will be silenced" unless we are actually going to silence them.
2488 Previously we would say this whenever a BUG() check failed in the
2489 code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
2491 o Minor bugfixes (logging, backport from 0.4.3.4-rc):
2492 - Flush stderr, stdout, and file logs during shutdown, if supported
2493 by the OS. This change helps make sure that any final logs are
2494 recorded. Fixes bug 33087; bugfix on 0.4.1.6.
2496 o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
2497 - Downgrade a noisy log message that could occur naturally when
2498 receiving an extrainfo document that we no longer want. Fixes bug
2499 16016; bugfix on 0.2.6.3-alpha.
2501 o Minor bugfixes (onion service v3, client, backport from 0.4.3.3-alpha):
2502 - Remove a BUG() warning that would cause a stack trace if an onion
2503 service descriptor was freed while we were waiting for a
2504 rendezvous circuit to complete. Fixes bug 28992; bugfix
2507 o Testing (CI, backport from 0.4.3.4-rc):
2508 - In our Appveyor Windows CI, copy required DLLs to test and app
2509 directories, before running tor's tests. This ensures that tor.exe
2510 and test*.exe use the correct version of each DLL. This fix is not
2511 required, but we hope it will avoid DLL search issues in future.
2512 Fixes bug 33673; bugfix on 0.3.4.2-alpha.
2513 - On Appveyor, skip the crypto/openssl_version test, which is
2514 failing because of a mismatched library installation. Fix
2518 Changes in version 0.4.3.6 - 2020-07-09
2519 Tor 0.4.3.6 backports several bugfixes from later releases, including
2520 some affecting usability.
2522 This release also fixes TROVE-2020-001, a medium-severity denial of
2523 service vulnerability affecting all versions of Tor when compiled with
2524 the NSS encryption library. (This is not the default configuration.)
2525 Using this vulnerability, an attacker could cause an affected Tor
2526 instance to crash remotely. This issue is also tracked as CVE-2020-
2527 15572. Anybody running a version of Tor built with the NSS library
2528 should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
2531 o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
2532 - Fix a crash due to an out-of-bound memory access when Tor is
2533 compiled with NSS support. Fixes bug 33119; bugfix on
2534 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
2537 o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
2538 - Use the correct 64-bit printf format when compiling with MINGW on
2539 Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
2541 o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
2542 - Resume use of preemptively-built circuits when UseEntryGuards is set
2543 to 0. We accidentally disabled this feature with that config
2544 setting, leading to slower load times. Fixes bug 34303; bugfix
2547 o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
2548 - Fix a compiler warning on platforms with 32-bit time_t values.
2549 Fixes bug 40028; bugfix on 0.3.2.8-rc.
2551 o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
2552 - Fix a startup crash when tor is compiled with --enable-nss and
2553 sandbox support is enabled. Fixes bug 34130; bugfix on
2554 0.3.5.1-alpha. Patch by Daniel Pinto.
2556 o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
2557 - Downgrade a noisy log message that could occur naturally when
2558 receiving an extrainfo document that we no longer want. Fixes bug
2559 16016; bugfix on 0.2.6.3-alpha.
2561 o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
2562 - Update the man page to reflect that MinUptimeHidServDirectoryV2
2563 defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
2565 o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
2566 - Prevent an assert() that would occur when cleaning the client
2567 descriptor cache, and attempting to close circuits for a non-
2568 decrypted descriptor (lacking client authorization). Fixes bug
2569 33458; bugfix on 0.4.2.1-alpha.
2571 o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
2572 - Fix a portability error in the configure script, where we were
2573 using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
2575 o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
2576 - Stop advertising incorrect IPv6 ORPorts in relay and bridge
2577 descriptors, when the IPv6 port was configured as "auto". Fixes
2578 bug 32588; bugfix on 0.2.3.9-alpha.
2580 o Documentation (backport from 0.4.4.1-alpha):
2581 - Fix several doxygen warnings related to imbalanced groups. Closes
2585 Changes in version 0.4.3.5 - 2020-05-15
2586 Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This
2587 series adds support for building without relay code enabled, and
2588 implements functionality needed for OnionBalance with v3 onion
2589 services. It includes significant refactoring of our configuration and
2590 controller functionality, and fixes numerous smaller bugs and
2593 Per our support policy, we support each stable release series for nine
2594 months after its first stable release, or three months after the first
2595 stable release of the next series: whichever is longer. This means
2596 that 0.4.3.x will be supported until around February 2021--later, if
2597 0.4.4.x is later than anticipated.
2599 Note also that support for 0.4.1.x is about to end on May 20 of this
2600 year; 0.4.2.x will be supported until September 15. We still plan to
2601 continue supporting 0.3.5.x, our long-term stable series, until
2604 Below are the changes since 0.4.2.6. For a list of only the changes
2605 since 0.4.3.4-rc, see the ChangeLog file.
2607 o New system requirements:
2608 - When building Tor, you now need to have Python 3 in order to run
2609 the integration tests. (Python 2 is officially unsupported
2610 upstream, as of 1 Jan 2020.) Closes ticket 32608.
2612 o Major features (build system):
2613 - The relay code can now be disabled using the --disable-module-relay
2614 configure option. When this option is set, we also disable the
2615 dirauth module. Closes ticket 32123.
2616 - When Tor is compiled --disable-module-relay, we also omit the code
2617 used to act as a directory cache. Closes ticket 32487.
2619 o Major features (directory authority, ed25519):
2620 - Add support for banning a relay's ed25519 keys in the approved-
2621 routers file. This will help us migrate away from RSA keys in the
2622 future. Previously, only RSA keys could be banned in approved-
2623 routers. Resolves ticket 22029. Patch by Neel Chauhan.
2625 o Major features (onion services):
2626 - New control port commands to manage client-side onion service
2627 authorization credentials. The ONION_CLIENT_AUTH_ADD command adds
2628 a credential, ONION_CLIENT_AUTH_REMOVE deletes a credential, and
2629 ONION_CLIENT_AUTH_VIEW lists the credentials. Closes ticket 30381.
2630 - Introduce a new SocksPort flag, ExtendedErrors, to support more
2631 detailed error codes in information for applications that support
2632 them. Closes ticket 30382; implements proposal 304.
2634 o Major features (proxy):
2635 - In addition to its current supported proxy types (HTTP CONNECT,
2636 SOCKS4, and SOCKS5), Tor can now make its OR connections through a
2637 HAProxy server. A new torrc option was added to specify the
2638 address/port of the server: TCPProxy <protocol> <host>:<port>.
2639 Currently the only supported protocol for the option is haproxy.
2640 Closes ticket 31518. Patch done by Suphanat Chunhapanya (haxxpop).
2642 o Major bugfixes (security, denial-of-service):
2643 - Fix a denial-of-service bug that could be used by anyone to
2644 consume a bunch of CPU on any Tor relay or authority, or by
2645 directories to consume a bunch of CPU on clients or hidden
2646 services. Because of the potential for CPU consumption to
2647 introduce observable timing patterns, we are treating this as a
2648 high-severity security issue. Fixes bug 33119; bugfix on
2649 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
2650 as TROVE-2020-002 and CVE-2020-10592.
2652 o Major bugfixes (circuit padding, memory leak):
2653 - Avoid a remotely triggered memory leak in the case that a circuit
2654 padding machine is somehow negotiated twice on the same circuit.
2655 Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
2656 This is also tracked as TROVE-2020-004 and CVE-2020-10593.
2658 o Major bugfixes (directory authority):
2659 - Directory authorities will now send a 503 (not enough bandwidth)
2660 code to clients when under bandwidth pressure. Known relays and
2661 other authorities will always be answered regardless of the
2662 bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
2664 o Major bugfixes (DoS defenses, bridges, pluggable transport):
2665 - Fix a bug that was preventing DoS defenses from running on bridges
2666 with a pluggable transport. Previously, the DoS subsystem was not
2667 given the transport name of the client connection, thus failed to
2668 find the GeoIP cache entry for that client address. Fixes bug
2669 33491; bugfix on 0.3.3.2-alpha.
2671 o Major bugfixes (networking):
2672 - Correctly handle IPv6 addresses in SOCKS5 RESOLVE_PTR requests,
2673 and accept strings as well as binary addresses. Fixes bug 32315;
2674 bugfix on 0.3.5.1-alpha.
2676 o Major bugfixes (onion service):
2677 - Report HS circuit failure back into the HS subsystem so we take
2678 appropriate action with regards to the client introduction point
2679 failure cache. This improves reachability of onion services, since
2680 now clients notice failing introduction circuits properly. Fixes
2681 bug 32020; bugfix on 0.3.2.1-alpha.
2683 o Minor feature (heartbeat, onion service):
2684 - Add the DoS INTRODUCE2 defenses counter to the heartbeat DoS
2685 message. Closes ticket 31371.
2687 o Minor feature (sendme, flow control):
2688 - Default to sending SENDME version 1 cells. (Clients are already
2689 sending these, because of a consensus parameter telling them to do
2690 so: this change only affects what clients would do if the
2691 consensus didn't contain a recommendation.) Closes ticket 33623.
2693 o Minor features (best practices tracker):
2694 - Practracker now supports a --regen-overbroad option to regenerate
2695 the exceptions file, but only to revise exceptions to be _less_
2696 tolerant of best-practices violations. Closes ticket 32372.
2698 o Minor features (configuration validation):
2699 - Configuration validation can now be done by per-module callbacks,
2700 rather than a global validation function. This will let us reduce
2701 the size of config.c and some of its more cumbersome functions.
2702 Closes ticket 31241.
2704 o Minor features (configuration):
2705 - If a configured hardware crypto accelerator in AccelName is
2706 prefixed with "!", Tor now exits when it cannot be found. Closes
2708 - We now use flag-driven logic to warn about obsolete configuration
2709 fields, so that we can include their names. In 0.4.2, we used a
2710 special type, which prevented us from generating good warnings.
2711 Implements ticket 32404.
2713 o Minor features (configure, build system):
2714 - Output a list of enabled/disabled features at the end of the
2715 configure process in a pleasing way. Closes ticket 31373.
2717 o Minor features (continuous integration):
2718 - Run Doxygen Makefile target on Travis, so we can learn about
2719 regressions in our internal documentation. Closes ticket 32455.
2720 - Stop allowing failures on the Travis CI stem tests job. It looks
2721 like all the stem hangs we were seeing before are now fixed.
2722 Closes ticket 33075.
2724 o Minor features (controller):
2725 - Add stream isolation data to STREAM event. Closes ticket 19859.
2726 - Implement a new GETINFO command to fetch microdescriptor
2727 consensus. Closes ticket 31684.
2729 o Minor features (debugging, directory system):
2730 - Don't crash when we find a non-guard with a guard-fraction value
2731 set. Instead, log a bug warning, in an attempt to figure out how
2732 this happened. Diagnostic for ticket 32868.
2734 o Minor features (defense in depth):
2735 - Add additional checks around tor_vasprintf() usage, in case the
2736 function returns an error. Patch by Tobias Stoeckmann. Fixes
2739 o Minor features (developer tools):
2740 - Remove the 0.2.9.x series branches from git scripts (git-merge-
2741 forward.sh, git-pull-all.sh, git-push-all.sh, git-setup-dirs.sh).
2742 Closes ticket 32772.
2743 - Add a check_cocci_parse.sh script that checks that new code is
2744 parseable by Coccinelle. Add an exceptions file for unparseable
2745 files, and run the script from travis CI. Closes ticket 31919.
2746 - Call the check_cocci_parse.sh script from a 'check-cocci' Makefile
2747 target. Closes ticket 31919.
2748 - Add a rename_c_identifiers.py tool to rename a bunch of C
2749 identifiers at once, and generate a well-formed commit message
2750 describing the change. This should help with refactoring. Closes
2752 - Add some scripts in "scripts/coccinelle" to invoke the Coccinelle
2753 semantic patching tool with the correct flags. These flags are
2754 fairly easy to forget, and these scripts should help us use
2755 Coccinelle more effectively in the future. Closes ticket 31705.
2757 o Minor features (diagnostic):
2758 - Improve assertions and add some memory-poisoning code to try to
2759 track down possible causes of a rare crash (32564) in the EWMA
2760 code. Closes ticket 33290.
2762 o Minor features (directory authorities):
2763 - Directory authorities now reject descriptors from relays running
2764 Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
2765 still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
2767 o Minor features (Doxygen):
2768 - Update Doxygen configuration file to a more recent template (from
2769 1.8.15). Closes ticket 32110.
2770 - "make doxygen" now works with out-of-tree builds. Closes
2772 - Make sure that doxygen outputs documentation for all of our C
2773 files. Previously, some were missing @file declarations, causing
2774 them to be ignored. Closes ticket 32307.
2775 - Our "make doxygen" target now respects --enable-fatal-warnings by
2776 default, and does not warn about items that are missing
2777 documentation. To warn about missing documentation, run configure
2778 with the "--enable-missing-doc-warnings" flag: doing so suspends
2779 fatal warnings for doxygen. Closes ticket 32385.
2781 o Minor features (git scripts):
2782 - Add TOR_EXTRA_CLONE_ARGS to git-setup-dirs.sh for git clone
2783 customisation. Closes ticket 32347.
2784 - Add git-setup-dirs.sh, which sets up an upstream git repository
2785 and worktrees for tor maintainers. Closes ticket 29603.
2786 - Add TOR_EXTRA_REMOTE_* to git-setup-dirs.sh for a custom extra
2787 remote. Closes ticket 32347.
2788 - Call the check_cocci_parse.sh script from the git commit and push
2789 hooks. Closes ticket 31919.
2790 - Make git-push-all.sh skip unchanged branches when pushing to
2791 upstream. The script already skipped unchanged test branches.
2792 Closes ticket 32216.
2793 - Make git-setup-dirs.sh create a master symlink in the worktree
2794 directory. Closes ticket 32347.
2795 - Skip unmodified source files when doing some existing git hook
2796 checks. Related to ticket 31919.
2798 o Minor features (IPv6, client):
2799 - Make Tor clients tell dual-stack exits that they prefer IPv6
2800 connections. This change is equivalent to setting the PreferIPv6
2801 flag on SOCKSPorts (and most other listener ports). Tor Browser
2802 has been setting this flag for some time, and we want to remove a
2803 client distinguisher at exits. Closes ticket 32637.
2805 o Minor features (portability, android):
2806 - When building for Android, disable some tests that depend on $HOME
2807 and/or pwdb, which Android doesn't have. Closes ticket 32825.
2808 Patch from Hans-Christoph Steiner.
2810 o Minor features (relay modularity):
2811 - Split the relay and server pluggable transport config code into
2812 separate files in the relay module. Disable this code when the
2813 relay module is disabled. Closes part of ticket 32213.
2814 - When the relay module is disabled, reject attempts to set the
2815 ORPort, DirPort, DirCache, BridgeRelay, ExtORPort, or
2816 ServerTransport* options, rather than ignoring the values of these
2817 options. Closes part of ticket 32213.
2818 - When the relay module is disabled, change the default config so
2819 that DirCache is 0, and ClientOnly is 1. Closes ticket 32410.
2821 o Minor features (release tools):
2822 - Port our ChangeLog formatting and sorting tools to Python 3.
2823 Closes ticket 32704.
2825 o Minor features (testing):
2826 - The unit tests now support a "TOR_SKIP_TESTCASES" environment
2827 variable to specify a list of space-separated test cases that
2828 should not be executed. We will use this to disable certain tests
2829 that are failing on Appveyor because of mismatched OpenSSL
2830 libraries. Part of ticket 33643.
2831 - Detect some common failure cases for test_parseconf.sh in
2832 src/test/conf_failures. Closes ticket 32451.
2833 - Allow test_parseconf.sh to test expected log outputs for successful
2834 configs, as well as failed configs. Closes ticket 32451.
2835 - The test_parseconf.sh script now supports result variants for any
2836 combination of the optional libraries lzma, nss, and zstd. Closes
2838 - When running the unit tests on Android, create temporary files in
2839 a subdirectory of /data/local/tmp. Closes ticket 32172. Based on a
2840 patch from Hans-Christoph Steiner.
2842 o Minor features (usability):
2843 - Include more information when failing to parse a configuration
2844 value. This should make it easier to tell what's going wrong when
2845 a configuration file doesn't parse. Closes ticket 33460.
2847 o Minor bugfix (relay, configuration):
2848 - Warn if the ContactInfo field is not set, and tell the relay
2849 operator that not having a ContactInfo field set might cause their
2850 relay to get rejected in the future. Fixes bug 33361; bugfix
2853 o Minor bugfixes (bridges):
2854 - Lowercase the configured value of BridgeDistribution before adding
2855 it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
2857 o Minor bugfixes (build system):
2858 - Fix "make autostyle" for out-of-tree builds. Fixes bug 32370;
2859 bugfix on 0.4.1.2-alpha.
2861 o Minor bugfixes (compiler compatibility):
2862 - Avoid compiler warnings from Clang 10 related to the use of GCC-
2863 style "/* falls through */" comments. Both Clang and GCC allow
2864 __attribute__((fallthrough)) instead, so that's what we're using
2865 now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
2866 - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
2869 o Minor bugfixes (configuration handling):
2870 - Make control_event_conf_changed() take in a config_line_t instead
2871 of a smartlist of alternating key/value entries. Fixes bug 31531;
2872 bugfix on 0.2.3.3-alpha. Patch by Neel Chauhan.
2873 - Check for multiplication overflow when parsing memory units inside
2874 configuration. Fixes bug 30920; bugfix on 0.0.9rc1.
2875 - When dumping the configuration, stop adding a trailing space after
2876 the option name when there is no option value. This issue only
2877 affects options that accept an empty value or list. (Most options
2878 reject empty values, or delete the entire line from the dumped
2879 options.) Fixes bug 32352; bugfix on 0.0.9pre6.
2880 - Avoid changing the user's value of HardwareAccel as stored by
2881 SAVECONF, when AccelName is set but HardwareAccel is not. Fixes
2882 bug 32382; bugfix on 0.2.2.1-alpha.
2883 - When creating a KeyDirectory with the same location as the
2884 DataDirectory (not recommended), respect the DataDirectory's
2885 group-readable setting if one has not been set for the
2886 KeyDirectory. Fixes bug 27992; bugfix on 0.3.3.1-alpha.
2888 o Minor bugfixes (continuous integration):
2889 - Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
2892 o Minor bugfixes (controller protocol):
2893 - When receiving "ACTIVE" or "DORMANT" signals on the control port,
2894 report them as SIGNAL events. Previously we would log a bug
2895 warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
2897 o Minor bugfixes (controller):
2898 - In routerstatus_has_changed(), check all the fields that are
2899 output over the control port. Fixes bug 20218; bugfix
2902 o Minor bugfixes (developer tools):
2903 - Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug
2904 31336; bugfix on 0.4.1.2-alpha.
2906 o Minor bugfixes (dirauth module):
2907 - Split the dirauth config code into a separate file in the dirauth
2908 module. Disable this code when the dirauth module is disabled.
2909 Closes ticket 32213.
2910 - When the dirauth module is disabled, reject attempts to set the
2911 AuthoritativeDir option, rather than ignoring the value of the
2912 option. Fixes bug 32213; bugfix on 0.3.4.1-alpha.
2914 o Minor bugfixes (embedded Tor):
2915 - When starting Tor any time after the first time in a process,
2916 register the thread in which it is running as the main thread.
2917 Previously, we only did this on Windows, which could lead to bugs
2918 like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
2921 o Minor bugfixes (git scripts):
2922 - Avoid sleeping before the last push in git-push-all.sh. Closes
2924 - Forward all unrecognised arguments in git-push-all.sh to git push.
2925 Closes ticket 32216.
2927 o Minor bugfixes (key portability):
2928 - When reading PEM-encoded key data, tolerate CRLF line-endings even
2929 if we are not running on Windows. Previously, non-Windows hosts
2930 would reject these line-endings in certain positions, making
2931 certain key files hard to move from one host to another. Fixes bug
2932 33032; bugfix on 0.3.5.1-alpha.
2934 o Minor bugfixes (logging):
2935 - Stop truncating IPv6 addresses and ports in channel and connection
2936 logs. Fixes bug 33918; bugfix on 0.2.4.4-alpha.
2937 - Flush stderr, stdout, and file logs during shutdown, if supported
2938 by the OS. This change helps make sure that any final logs are
2939 recorded. Fixes bug 33087; bugfix on 0.4.1.6.
2940 - Stop closing stderr and stdout during shutdown. Closing these file
2941 descriptors can hide sanitiser logs. Fixes bug 33087; bugfix
2943 - If we encounter a bug when flushing a buffer to a TLS connection,
2944 only log the bug once per invocation of the Tor process.
2945 Previously we would log with every occurrence, which could cause
2946 us to run out of disk space. Fixes bug 33093; bugfix
2948 - When logging a bug, do not say "Future instances of this warning
2949 will be silenced" unless we are actually going to silence them.
2950 Previously we would say this whenever a BUG() check failed in the
2951 code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
2953 o Minor bugfixes (onion services v2):
2954 - Move a series of v2 onion service warnings to protocol-warning
2955 level because they can all be triggered remotely by a malformed
2956 request. Fixes bug 32706; bugfix on 0.1.1.14-alpha.
2957 - When sending the INTRO cell for a v2 Onion Service, look at the
2958 failure cache alongside timeout values to check if the intro point
2959 is marked as failed. Previously, we only looked at the relay
2960 timeout values. Fixes bug 25568; bugfix on 0.2.7.3-rc. Patch by
2963 o Minor bugfixes (onion services v3):
2964 - Remove a BUG() warning that would cause a stack trace if an onion
2965 service descriptor was freed while we were waiting for a
2966 rendezvous circuit to complete. Fixes bug 28992; bugfix
2968 - Relax severity of a log message that can appear naturally when
2969 decoding onion service descriptors as a relay. Also add some
2970 diagnostics to debug any future bugs in that area. Fixes bug
2971 31669; bugfix on 0.3.0.1-alpha.
2972 - Fix an assertion failure that could result from a corrupted
2973 ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
2974 bugfix on 0.3.3.1-alpha. This issue is also tracked
2976 - Properly handle the client rendezvous circuit timeout. Previously
2977 Tor would sometimes timeout a rendezvous circuit awaiting the
2978 introduction ACK, and find itself unable to re-establish all
2979 circuits because the rendezvous circuit timed out too early. Fixes
2980 bug 32021; bugfix on 0.3.2.1-alpha.
2982 o Minor bugfixes (onion services):
2983 - Do not rely on a "circuit established" flag for intro circuits but
2984 instead always query the HS circuit map. This is to avoid sync
2985 issue with that flag and the map. Fixes bug 32094; bugfix
2988 o Minor bugfixes (onion services, all):
2989 - In cancel_descriptor_fetches(), use
2990 connection_list_by_type_purpose() instead of
2991 connection_list_by_type_state(). Fixes bug 32639; bugfix on
2992 0.3.2.1-alpha. Patch by Neel Chauhan.
2994 o Minor bugfixes (pluggable transports):
2995 - When receiving a message on standard error from a pluggable
2996 transport, log it at info level, rather than as a warning. Fixes
2997 bug 33005; bugfix on 0.4.0.1-alpha.
2999 o Minor bugfixes (rust, build):
3000 - Fix a syntax warning given by newer versions of Rust that was
3001 creating problems for our continuous integration. Fixes bug 33212;
3002 bugfix on 0.3.5.1-alpha.
3004 o Minor bugfixes (scripts):
3005 - Fix update_versions.py for out-of-tree builds. Fixes bug 32371;
3006 bugfix on 0.4.0.1-alpha.
3008 o Minor bugfixes (testing):
3009 - Use the same code to find the tor binary in all of our test
3010 scripts. This change makes sure we are always using the coverage
3011 binary when coverage is enabled. Fixes bug 32368; bugfix
3013 - Stop ignoring "tor --dump-config" errors in test_parseconf.sh.
3014 Fixes bug 32468; bugfix on 0.4.2.1-alpha.
3015 - Our option-validation tests no longer depend on specially
3016 configured non-default, non-passing sets of options. Previously,
3017 the tests had been written to assume that options would _not_ be
3018 set to their defaults, which led to needless complexity and
3019 verbosity. Fixes bug 32175; bugfix on 0.2.8.1-alpha.
3021 o Minor bugfixes (TLS bug handling):
3022 - When encountering a bug in buf_read_from_tls(), return a "MISC"
3023 error code rather than "WANTWRITE". This change might help avoid
3024 some CPU-wasting loops if the bug is ever triggered. Bug reported
3025 by opara. Fixes bug 32673; bugfix on 0.3.0.4-alpha.
3027 o Deprecated features:
3028 - Deprecate the ClientAutoIPv6ORPort option. This option was not
3029 true "Happy Eyeballs", and often failed on connections that
3030 weren't reliably dual-stack. Closes ticket 32942. Patch by
3034 - Provide a quickstart guide for a Circuit Padding Framework, and
3035 documentation for researchers to implement and study circuit
3036 padding machines. Closes ticket 28804.
3037 - Add documentation in 'HelpfulTools.md' to describe how to build a
3038 tag file. Closes ticket 32779.
3039 - Create a high-level description of the long-term software
3040 architecture goals. Closes ticket 32206.
3041 - Describe the --dump-config command in the manual page. Closes
3043 - Unite coding advice from this_not_that.md in torguts repo into our
3044 coding standards document. Resolves ticket 31853.
3047 - Our Doxygen configuration no longer generates LaTeX output. The
3048 reference manual produced by doing this was over 4000 pages long,
3049 and generally unusable. Closes ticket 32099.
3050 - The option "TestingEstimatedDescriptorPropagationTime" is now
3051 marked as obsolete. It has had no effect since 0.3.0.7, when
3052 clients stopped rejecting consensuses "from the future". Closes
3054 - We no longer support consensus methods before method 28; these
3055 methods were only used by authorities running versions of Tor that
3056 are now at end-of-life. In effect, this means that clients,
3057 relays, and authorities now assume that authorities will be
3058 running version 0.3.5.x or later. Closes ticket 32695.
3061 - Avoid conflicts between the fake sockets in tor's unit tests, and
3062 real file descriptors. Resolves issues running unit tests with
3063 GitHub Actions, where the process that embeds or launches the
3064 tests has already opened a large number of file descriptors. Fixes
3065 bug 33782; bugfix on 0.2.8.1-alpha. Found and fixed by
3067 - Add more test cases for tor's UTF-8 validation function. Also,
3068 check the arguments passed to the function for consistency. Closes
3070 - Improve test coverage for relay and dirauth config code, focusing
3071 on option validation and normalization. Closes ticket 32213.
3072 - Improve the consistency of test_parseconf.sh output, and run all
3073 the tests, even if one fails. Closes ticket 32213.
3074 - Run the practracker unit tests in the pre-commit git hook. Closes
3077 o Code simplification and refactoring (channel):
3078 - Channel layer had a variable length cell handler that was not used
3079 and thus removed. Closes ticket 32892.
3081 o Code simplification and refactoring (configuration):
3082 - Immutability is now implemented as a flag on individual
3083 configuration options rather than as part of the option-transition
3084 checking code. Closes ticket 32344.
3085 - Instead of keeping a list of configuration options to check for
3086 relative paths, check all the options whose type is "FILENAME".
3087 Solves part of ticket 32339.
3088 - Our default log (which ordinarily sends NOTICE-level messages to
3089 standard output) is now handled in a more logical manner.
3090 Previously, we replaced the configured log options if they were
3091 empty. Now, we interpret an empty set of log options as meaning
3092 "use the default log". Closes ticket 31999.
3093 - Remove some unused arguments from the options_validate() function,
3094 to simplify our code and tests. Closes ticket 32187.
3095 - Simplify the options_validate() code so that it looks at the
3096 default options directly, rather than taking default options as an
3097 argument. This change lets us simplify its interface. Closes
3099 - Use our new configuration architecture to move most authority-
3100 related options to the directory authority module. Closes
3102 - When parsing the command line, handle options that determine our
3103 "quiet level" and our mode of operation (e.g., --dump-config and
3104 so on) all in one table. Closes ticket 32003.
3106 o Code simplification and refactoring (controller):
3107 - Create a new abstraction for formatting control protocol reply
3108 lines based on key-value pairs. Refactor some existing control
3109 protocol code to take advantage of this. Closes ticket 30984.
3110 - Create a helper function that can fetch network status or
3111 microdesc consensuses. Closes ticket 31684.
3113 o Code simplification and refactoring (dirauth modularization):
3114 - Remove the last remaining HAVE_MODULE_DIRAUTH inside a function.
3115 Closes ticket 32163.
3116 - Replace some confusing identifiers in process_descs.c. Closes
3118 - Simplify some relay and dirauth config code. Closes ticket 32213.
3120 o Code simplification and refactoring (mainloop):
3121 - Simplify the ip_address_changed() function by removing redundant
3122 checks. Closes ticket 33091.
3124 o Code simplification and refactoring (misc):
3125 - Make all the structs we declare follow the same naming convention
3126 of ending with "_t". Closes ticket 32415.
3127 - Move and rename some configuration-related code for clarity.
3128 Closes ticket 32304.
3129 - Our include.am files are now broken up by subdirectory.
3130 Previously, src/core/include.am covered all of the subdirectories
3131 in "core", "feature", and "app". Closes ticket 32137.
3132 - Remove underused NS*() macros from test code: they make our tests
3133 more confusing, especially for code-formatting tools. Closes
3136 o Code simplification and refactoring (relay modularization):
3137 - Disable relay_periodic when the relay module is disabled. Closes
3139 - Disable relay_sys when the relay module is disabled. Closes
3142 o Code simplification and refactoring (tool support):
3143 - Add numerous missing dependencies to our include files, so that
3144 they can be included in different reasonable orders and still
3145 compile. Addresses part of ticket 32764.
3146 - Fix some parts of our code that were difficult for Coccinelle to
3147 parse. Related to ticket 31705.
3148 - Fix some small issues in our code that prevented automatic
3149 formatting tools from working. Addresses part of ticket 32764.
3151 o Documentation (manpage):
3152 - Alphabetize the Server and Directory server sections of the tor
3153 manpage. Also split Statistics options into their own section of
3154 the manpage. Closes ticket 33188. Work by Swati Thacker as part of
3155 Google Season of Docs.
3156 - Document the __OwningControllerProcess torrc option and specify
3157 its polling interval. Resolves issue 32971.
3158 - Split "Circuit Timeout" options and "Node Selection" options into
3159 their own sections of the tor manpage. Closes tickets 32928 and
3160 32929. Work by Swati Thacker as part of Google Season of Docs.
3161 - Alphabetize the Client Options section of the tor manpage. Closes
3163 - Alphabetize the General Options section of the tor manpage. Closes
3165 - In the tor(1) manpage, reword and improve formatting of the
3166 COMMAND-LINE OPTIONS and DESCRIPTION sections. Closes ticket
3167 32277. Based on work by Swati Thacker as part of Google Season
3169 - In the tor(1) manpage, reword and improve formatting of the FILES,
3170 SEE ALSO, and BUGS sections. Closes ticket 32176. Based on work by
3171 Swati Thacker as part of Google Season of Docs.
3173 o Testing (Appveyor CI):
3174 - In our Appveyor Windows CI, copy required DLLs to test and app
3175 directories, before running tor's tests. This ensures that tor.exe
3176 and test*.exe use the correct version of each DLL. This fix is not
3177 required, but we hope it will avoid DLL search issues in future.
3178 Fixes bug 33673; bugfix on 0.3.4.2-alpha.
3179 - On Appveyor, skip the crypto/openssl_version test, which is
3180 failing because of a mismatched library installation. Fix
3183 o Testing (circuit, EWMA):
3184 - Add unit tests for circuitmux and EWMA subsystems. Closes
3187 o Testing (Travis CI):
3188 - Remove a redundant distcheck job. Closes ticket 33194.
3189 - Sort the Travis jobs in order of speed: putting the slowest jobs
3190 first takes full advantage of Travis job concurrency. Closes
3192 - Stop allowing the Chutney IPv6 Travis job to fail. This job was
3193 previously configured to fast_finish (which requires
3194 allow_failure), to speed up the build. Closes ticket 33195.
3195 - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
3196 tool to produce detailed diagnostic output. Closes ticket 32792.
3199 Changes in version 0.4.2.7 - 2020-03-18
3200 This is the third stable release in the 0.4.2.x series. It backports
3201 numerous fixes from later releases, including a fix for TROVE-2020-
3202 002, a major denial-of-service vulnerability that affected all
3203 released Tor instances since 0.2.1.5-alpha. Using this vulnerability,
3204 an attacker could cause Tor instances to consume a huge amount of CPU,
3205 disrupting their operations for several seconds or minutes. This
3206 attack could be launched by anybody against a relay, or by a directory
3207 cache against any client that had connected to it. The attacker could
3208 launch this attack as much as they wanted, thereby disrupting service
3209 or creating patterns that could aid in traffic analysis. This issue
3210 was found by OSS-Fuzz, and is also tracked as CVE-2020-10592.
3212 We do not have reason to believe that this attack is currently being
3213 exploited in the wild, but nonetheless we advise everyone to upgrade
3214 as soon as packages are available.
3216 o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
3217 - Fix a denial-of-service bug that could be used by anyone to
3218 consume a bunch of CPU on any Tor relay or authority, or by
3219 directories to consume a bunch of CPU on clients or hidden
3220 services. Because of the potential for CPU consumption to
3221 introduce observable timing patterns, we are treating this as a
3222 high-severity security issue. Fixes bug 33119; bugfix on
3223 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
3224 as TROVE-2020-002 and CVE-2020-10592.
3226 o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
3227 - Avoid a remotely triggered memory leak in the case that a circuit
3228 padding machine is somehow negotiated twice on the same circuit.
3229 Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
3230 This is also tracked as TROVE-2020-004 and CVE-2020-10593.
3232 o Major bugfixes (directory authority, backport from 0.4.3.3-alpha):
3233 - Directory authorities will now send a 503 (not enough bandwidth)
3234 code to clients when under bandwidth pressure. Known relays and
3235 other authorities will always be answered regardless of the
3236 bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
3238 o Minor features (continuous integration, backport from 0.4.3.2-alpha):
3239 - Stop allowing failures on the Travis CI stem tests job. It looks
3240 like all the stem hangs we were seeing before are now fixed.
3241 Closes ticket 33075.
3243 o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
3244 - Lowercase the configured value of BridgeDistribution before adding
3245 it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
3247 o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
3248 - If we encounter a bug when flushing a buffer to a TLS connection,
3249 only log the bug once per invocation of the Tor process.
3250 Previously we would log with every occurrence, which could cause
3251 us to run out of disk space. Fixes bug 33093; bugfix
3254 o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
3255 - Fix an assertion failure that could result from a corrupted
3256 ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
3257 bugfix on 0.3.3.1-alpha. This issue is also tracked
3260 o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
3261 - Fix a syntax warning given by newer versions of Rust that was
3262 creating problems for our continuous integration. Fixes bug 33212;
3263 bugfix on 0.3.5.1-alpha.
3265 o Testing (Travis CI, backport from 0.4.3.3-alpha):
3266 - Remove a redundant distcheck job. Closes ticket 33194.
3267 - Sort the Travis jobs in order of speed: putting the slowest jobs
3268 first takes full advantage of Travis job concurrency. Closes
3270 - Stop allowing the Chutney IPv6 Travis job to fail. This job was
3271 previously configured to fast_finish (which requires
3272 allow_failure), to speed up the build. Closes ticket 33195.
3273 - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
3274 tool to produce detailed diagnostic output. Closes ticket 32792.
3277 Changes in version 0.4.1.9 - 2020-03-18
3278 Tor 0.4.1.9 backports important fixes from later Tor releases,
3279 including a fix for TROVE-2020-002, a major denial-of-service
3280 vulnerability that affected all released Tor instances since
3281 0.2.1.5-alpha. Using this vulnerability, an attacker could cause Tor
3282 instances to consume a huge amount of CPU, disrupting their operations
3283 for several seconds or minutes. This attack could be launched by
3284 anybody against a relay, or by a directory cache against any client
3285 that had connected to it. The attacker could launch this attack as
3286 much as they wanted, thereby disrupting service or creating patterns
3287 that could aid in traffic analysis. This issue was found by OSS-Fuzz,
3288 and is also tracked as CVE-2020-10592.
3290 We do not have reason to believe that this attack is currently being
3291 exploited in the wild, but nonetheless we advise everyone to upgrade
3292 as soon as packages are available.
3294 o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
3295 - Fix a denial-of-service bug that could be used by anyone to
3296 consume a bunch of CPU on any Tor relay or authority, or by
3297 directories to consume a bunch of CPU on clients or hidden
3298 services. Because of the potential for CPU consumption to
3299 introduce observable timing patterns, we are treating this as a
3300 high-severity security issue. Fixes bug 33119; bugfix on
3301 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
3302 as TROVE-2020-002 and CVE-2020-10592.
3304 o Major bugfixes (circuit padding, memory leak, backport from 0.4.3.3-alpha):
3305 - Avoid a remotely triggered memory leak in the case that a circuit
3306 padding machine is somehow negotiated twice on the same circuit.
3307 Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
3308 This is also tracked as TROVE-2020-004 and CVE-2020-10593.
3310 o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
3311 - Lowercase the configured value of BridgeDistribution before adding
3312 it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
3314 o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
3315 - If we encounter a bug when flushing a buffer to a TLS connection,
3316 only log the bug once per invocation of the Tor process.
3317 Previously we would log with every occurrence, which could cause
3318 us to run out of disk space. Fixes bug 33093; bugfix
3321 o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
3322 - Fix an assertion failure that could result from a corrupted
3323 ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
3324 bugfix on 0.3.3.1-alpha. This issue is also tracked
3327 o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
3328 - Fix a syntax warning given by newer versions of Rust that was
3329 creating problems for our continuous integration. Fixes bug 33212;
3330 bugfix on 0.3.5.1-alpha.
3332 o Testing (Travis CI, backport from 0.4.3.3-alpha):
3333 - Remove a redundant distcheck job. Closes ticket 33194.
3334 - Sort the Travis jobs in order of speed: putting the slowest jobs
3335 first takes full advantage of Travis job concurrency. Closes
3337 - Stop allowing the Chutney IPv6 Travis job to fail. This job was
3338 previously configured to fast_finish (which requires
3339 allow_failure), to speed up the build. Closes ticket 33195.
3340 - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
3341 tool to produce detailed diagnostic output. Closes ticket 32792.
3344 Changes in version 0.3.5.10 - 2020-03-18
3345 Tor 0.3.5.10 backports many fixes from later Tor releases, including a
3346 fix for TROVE-2020-002, a major denial-of-service vulnerability that
3347 affected all released Tor instances since 0.2.1.5-alpha. Using this
3348 vulnerability, an attacker could cause Tor instances to consume a huge
3349 amount of CPU, disrupting their operations for several seconds or
3350 minutes. This attack could be launched by anybody against a relay, or
3351 by a directory cache against any client that had connected to it. The
3352 attacker could launch this attack as much as they wanted, thereby
3353 disrupting service or creating patterns that could aid in traffic
3354 analysis. This issue was found by OSS-Fuzz, and is also tracked
3357 We do not have reason to believe that this attack is currently being
3358 exploited in the wild, but nonetheless we advise everyone to upgrade
3359 as soon as packages are available.
3361 o Major bugfixes (security, denial-of-service, backport from 0.4.3.3-alpha):
3362 - Fix a denial-of-service bug that could be used by anyone to
3363 consume a bunch of CPU on any Tor relay or authority, or by
3364 directories to consume a bunch of CPU on clients or hidden
3365 services. Because of the potential for CPU consumption to
3366 introduce observable timing patterns, we are treating this as a
3367 high-severity security issue. Fixes bug 33119; bugfix on
3368 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
3369 as TROVE-2020-002 and CVE-2020-10592.
3371 o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
3372 - Correct how we use libseccomp. Particularly, stop assuming that
3373 rules are applied in a particular order or that more rules are
3374 processed after the first match. Neither is the case! In
3375 libseccomp <2.4.0 this lead to some rules having no effect.
3376 libseccomp 2.4.0 changed how rules are generated, leading to a
3377 different ordering, which in turn led to a fatal crash during
3378 startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
3381 o Minor features (continuous integration, backport from 0.4.3.2-alpha):
3382 - Stop allowing failures on the Travis CI stem tests job. It looks
3383 like all the stem hangs we were seeing before are now fixed.
3384 Closes ticket 33075.
3386 o Minor bugfixes (bridges, backport from 0.4.3.1-alpha):
3387 - Lowercase the configured value of BridgeDistribution before adding
3388 it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
3390 o Minor bugfixes (crash, backport from 0.4.2.4-rc):
3391 - When running Tor with an option like --verify-config or
3392 --dump-config that does not start the event loop, avoid crashing
3393 if we try to exit early because of an error. Fixes bug 32407;
3394 bugfix on 0.3.3.1-alpha.
3396 o Minor bugfixes (logging, backport from 0.4.3.2-alpha):
3397 - If we encounter a bug when flushing a buffer to a TLS connection,
3398 only log the bug once per invocation of the Tor process.
3399 Previously we would log with every occurrence, which could cause
3400 us to run out of disk space. Fixes bug 33093; bugfix
3403 o Minor bugfixes (onion services v3, backport from 0.4.3.3-alpha):
3404 - Fix an assertion failure that could result from a corrupted
3405 ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
3406 bugfix on 0.3.3.1-alpha. This issue is also tracked
3409 o Minor bugfixes (rust, build, backport from 0.4.3.2-alpha):
3410 - Fix a syntax warning given by newer versions of Rust that was
3411 creating problems for our continuous integration. Fixes bug 33212;
3412 bugfix on 0.3.5.1-alpha.
3414 o Testing (backport from 0.4.3.1-alpha):
3415 - Re-enable the Travis CI macOS Chutney build, but don't let it
3416 prevent the Travis job from finishing. (The Travis macOS jobs are
3417 slow, so we don't want to have it delay the whole CI process.)
3418 Closes ticket 32629.
3419 - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
3420 Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
3421 fix the sandbox errors in 32722. Closes ticket 32240.
3423 o Testing (continuous integration, backport from 0.4.3.1-alpha):
3424 - Use zstd in our Travis Linux builds. Closes ticket 32242.
3426 o Testing (Travis CI, backport from 0.4.3.3-alpha):
3427 - Remove a redundant distcheck job. Closes ticket 33194.
3428 - Sort the Travis jobs in order of speed: putting the slowest jobs
3429 first takes full advantage of Travis job concurrency. Closes
3431 - Stop allowing the Chutney IPv6 Travis job to fail. This job was
3432 previously configured to fast_finish (which requires
3433 - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
3434 tool to produce detailed diagnostic output. Closes ticket 32792.
3437 Changes in version 0.4.2.6 - 2020-01-30
3438 This is the second stable release in the 0.4.2.x series. It backports
3439 several bugfixes from 0.4.3.1-alpha, including some that had affected
3440 the Linux seccomp2 sandbox or Windows services. If you're running with
3441 one of those configurations, you'll probably want to upgrade;
3442 otherwise, you should be fine with 0.4.2.5.
3444 o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
3445 - Correct how we use libseccomp. Particularly, stop assuming that
3446 rules are applied in a particular order or that more rules are
3447 processed after the first match. Neither is the case! In
3448 libseccomp <2.4.0 this led to some rules having no effect.
3449 libseccomp 2.4.0 changed how rules are generated, leading to a
3450 different ordering, which in turn led to a fatal crash during
3451 startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
3453 - Fix crash when reloading logging configuration while the
3454 experimental sandbox is enabled. Fixes bug 32841; bugfix on
3455 0.4.1.7. Patch by Peter Gerber.
3457 o Minor bugfixes (correctness checks, backport from 0.4.3.1-alpha):
3458 - Use GCC/Clang's printf-checking feature to make sure that
3459 tor_assertf() arguments are correctly typed. Fixes bug 32765;
3460 bugfix on 0.4.1.1-alpha.
3462 o Minor bugfixes (logging, crash, backport from 0.4.3.1-alpha):
3463 - Avoid a possible crash when trying to log a (fatal) assertion
3464 failure about mismatched magic numbers in configuration objects.
3465 Fixes bug 32771; bugfix on 0.4.2.1-alpha.
3467 o Minor bugfixes (testing, backport from 0.4.3.1-alpha):
3468 - When TOR_DISABLE_PRACTRACKER is set, do not apply it to the
3469 test_practracker.sh script. Doing so caused a test failure. Fixes
3470 bug 32705; bugfix on 0.4.2.1-alpha.
3471 - When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when
3472 skipping practracker checks. Fixes bug 32705; bugfix
3475 o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
3476 - Initialize the publish/subscribe system when running as a windows
3477 service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
3479 o Testing (backport from 0.4.3.1-alpha):
3480 - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
3481 Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
3482 fix the sandbox errors in 32722. Closes ticket 32240.
3483 - Re-enable the Travis CI macOS Chutney build, but don't let it
3484 prevent the Travis job from finishing. (The Travis macOS jobs are
3485 slow, so we don't want to have it delay the whole CI process.)
3486 Closes ticket 32629.
3488 o Testing (continuous integration, backport from 0.4.3.1-alpha):
3489 - Use zstd in our Travis Linux builds. Closes ticket 32242.
3492 Changes in version 0.4.1.8 - 2020-01-30
3493 This release backports several bugfixes from later release series,
3494 including some that had affected the Linux seccomp2 sandbox or Windows
3495 services. If you're running with one of those configurations, you'll
3496 probably want to upgrade; otherwise, you should be fine with your
3497 current version of 0.4.1.x.
3499 o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
3500 - Correct how we use libseccomp. Particularly, stop assuming that
3501 rules are applied in a particular order or that more rules are
3502 processed after the first match. Neither is the case! In
3503 libseccomp <2.4.0 this led to some rules having no effect.
3504 libseccomp 2.4.0 changed how rules are generated, leading to a
3505 different ordering, which in turn led to a fatal crash during
3506 startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
3508 - Fix crash when reloading logging configuration while the
3509 experimental sandbox is enabled. Fixes bug 32841; bugfix on
3510 0.4.1.7. Patch by Peter Gerber.
3512 o Minor bugfixes (crash, backport form 0.4.2.4-rc):
3513 - When running Tor with an option like --verify-config or
3514 --dump-config that does not start the event loop, avoid crashing
3515 if we try to exit early because of an error. Fixes bug 32407;
3516 bugfix on 0.3.3.1-alpha.
3518 o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
3519 - Initialize the publish/subscribe system when running as a windows
3520 service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
3522 o Testing (backport from 0.4.3.1-alpha):
3523 - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
3524 Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
3525 fix the sandbox errors in 32722. Closes ticket 32240.
3526 - Re-enable the Travis CI macOS Chutney build, but don't let it
3527 prevent the Travis job from finishing. (The Travis macOS jobs are
3528 slow, so we don't want to have it delay the whole CI process.)
3529 Closes ticket 32629.
3531 o Testing (continuous integration, backport from 0.4.3.1-alpha):
3532 - Use zstd in our Travis Linux builds. Closes ticket 32242.
3535 Changes in version 0.4.2.5 - 2019-12-09
3536 This is the first stable release in the 0.4.2.x series. This series
3537 improves reliability and stability, and includes several stability and
3538 correctness improvements for onion services. It also fixes many smaller
3539 bugs present in previous series.
3541 Per our support policy, we will support the 0.4.2.x series for nine
3542 months, or until three months after the release of a stable 0.4.3.x:
3543 whichever is longer. If you need longer-term support, please stick
3544 with 0.3.5.x, which will we plan to support until Feb 2022.
3546 Below are the changes since 0.4.1.4-rc. For a complete list of only
3547 the changes since 0.4.2.4-rc, see the ChangeLog file.
3549 o Major features (directory authorities):
3550 - Directory authorities now reject relays running all currently
3551 deprecated release series. The currently supported release series
3552 are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
3554 o Major features (onion service v3, denial of service):
3555 - Add onion service introduction denial of service defenses. Intro
3556 points can now rate-limit client introduction requests, using
3557 parameters that can be sent by the service within the
3558 ESTABLISH_INTRO cell. If the cell extension for this is not used,
3559 the intro point will honor the consensus parameters. Closes
3562 o Major bugfixes (circuit build, guard):
3563 - When considering upgrading circuits from "waiting for guard" to
3564 "open", always ignore circuits that are marked for close.
3565 Previously we could end up in the situation where a subsystem is
3566 notified of a circuit opening, but the circuit is still marked for
3567 close, leading to undesirable behavior. Fixes bug 30871; bugfix
3570 o Major bugfixes (crash, Linux, Android):
3571 - Tolerate systems (including some Android installations) where
3572 madvise and MADV_DONTDUMP are available at build-time, but not at
3573 run time. Previously, these systems would notice a failed syscall
3574 and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
3575 - Tolerate systems (including some Linux installations) where
3576 madvise and/or MADV_DONTFORK are available at build-time, but not
3577 at run time. Previously, these systems would notice a failed
3578 syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
3580 o Major bugfixes (embedded Tor):
3581 - Avoid a possible crash when restarting Tor in embedded mode and
3582 enabling a different set of publish/subscribe messages. Fixes bug
3583 31898; bugfix on 0.4.1.1-alpha.
3585 o Major bugfixes (relay):
3586 - Relays now respect their AccountingMax bandwidth again. When
3587 relays entered "soft" hibernation (which typically starts when
3588 we've hit 90% of our AccountingMax), we had stopped checking
3589 whether we should enter hard hibernation. Soft hibernation refuses
3590 new connections and new circuits, but the existing circuits can
3591 continue, meaning that relays could have exceeded their configured
3592 AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
3594 o Major bugfixes (torrc parsing):
3595 - Stop ignoring torrc options after an %include directive, when the
3596 included directory ends with a file that does not contain any
3597 config options (but does contain comments or whitespace). Fixes
3598 bug 31408; bugfix on 0.3.1.1-alpha.
3600 o Major bugfixes (v3 onion services):
3601 - Onion services now always use the exact number of intro points
3602 configured with the HiddenServiceNumIntroductionPoints option (or
3603 fewer if nodes are excluded). Before, a service could sometimes
3604 pick more intro points than configured. Fixes bug 31548; bugfix
3607 o Minor feature (onion services, control port):
3608 - The ADD_ONION command's keyword "BEST" now defaults to ED25519-V3
3609 (v3) onion services. Previously it defaulted to RSA1024 (v2).
3610 Closes ticket 29669.
3612 o Minor features (auto-formatting scripts):
3613 - When annotating C macros, never generate a line that our check-
3614 spaces script would reject. Closes ticket 31759.
3615 - When annotating C macros, try to remove cases of double-negation.
3616 Closes ticket 31779.
3618 o Minor features (best practices tracker):
3619 - Our best-practices tracker now integrates with our include-checker
3620 tool to keep track of how many layering violations we have not yet
3621 fixed. We hope to reduce this number over time to improve Tor's
3622 modularity. Closes ticket 31176.
3623 - Add a TOR_PRACTRACKER_OPTIONS variable for passing arguments to
3624 practracker from the environment. We may want this for continuous
3625 integration. Closes ticket 31309.
3626 - Give a warning rather than an error when a practracker exception
3627 is violated by a small amount, add a --list-overbroad option to
3628 practracker that lists exceptions that are stricter than they need
3629 to be, and provide an environment variable for disabling
3630 practracker. Closes ticket 30752.
3631 - Our best-practices tracker now looks at headers as well as C
3632 files. Closes ticket 31175.
3634 o Minor features (build system):
3635 - Make pkg-config use --prefix when cross-compiling, if
3636 PKG_CONFIG_PATH is not set. Closes ticket 32191.
3637 - Add --disable-manpage and --disable-html-manual options to
3638 configure script. This will enable shortening build times by not
3639 building documentation. Resolves issue 19381.
3641 o Minor features (compilation):
3642 - Log a more useful error message when we are compiling and one of
3643 the compile-time hardening options we have selected can be linked
3644 but not executed. Closes ticket 27530.
3646 o Minor features (configuration):
3647 - The configuration code has been extended to allow splitting
3648 configuration data across multiple objects. Previously, all
3649 configuration data needed to be kept in a single object, which
3650 tended to become bloated. Closes ticket 31240.
3652 o Minor features (continuous integration):
3653 - When building on Appveyor and Travis, pass the "-k" flag to make,
3654 so that we are informed of all compilation failures, not just the
3655 first one or two. Closes ticket 31372.
3656 - When running CI builds on Travis, put some random data in
3657 ~/.torrc, to make sure no tests are reading the Tor configuration
3658 file from its default location. Resolves issue 30102.
3660 o Minor features (debugging):
3661 - Log a nonfatal assertion failure if we encounter a configuration
3662 line whose command is "CLEAR" but which has a nonempty value. This
3663 should be impossible, according to the rules of our configuration
3664 line parsing. Closes ticket 31529.
3666 o Minor features (geoip):
3667 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
3668 Country database. Closes ticket 32685.
3670 o Minor features (git hooks):
3671 - Our pre-commit git hook now checks for a special file before
3672 running practracker, so that practracker only runs on branches
3673 that are based on master. Since the pre-push hook calls the pre-
3674 commit hook, practracker will also only run before pushes of
3675 branches based on master. Closes ticket 30979.
3677 o Minor features (git scripts):
3678 - Add a "--" command-line argument, to separate git-push-all.sh
3679 script arguments from arguments that are passed through to git
3680 push. Closes ticket 31314.
3681 - Add a -r <remote-name> argument to git-push-all.sh, so the script
3682 can push test branches to a personal remote. Closes ticket 31314.
3683 - Add a -t <test-branch-prefix> argument to git-merge-forward.sh and
3684 git-push-all.sh, which makes these scripts create, merge forward,
3685 and push test branches. Closes ticket 31314.
3686 - Add a -u argument to git-merge-forward.sh, so that the script can
3687 re-use existing test branches after a merge failure and fix.
3688 Closes ticket 31314.
3689 - Add a TOR_GIT_PUSH env var, which sets the default git push
3690 command and arguments for git-push-all.sh. Closes ticket 31314.
3691 - Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the
3692 script push master and maint branches with a delay between each
3693 branch. These delays trigger the CI jobs in a set order, which
3694 should show the most likely failures first. Also make pushes
3695 atomic by default, and make the script pass any command-line
3696 arguments to git push. Closes ticket 29879.
3697 - Call the shellcheck script from the pre-commit hook. Closes
3699 - Skip pushing test branches that are the same as a remote
3700 maint/release/master branch in git-push-all.sh by default. Add a
3701 -s argument, so git-push-all.sh can push all test branches. Closes
3704 o Minor features (IPv6, logging):
3705 - Log IPv6 addresses as well as IPv4 addresses when describing
3706 routerinfos, routerstatuses, and nodes. Closes ticket 21003.
3708 o Minor features (maintenance scripts):
3709 - Add a Coccinelle script to detect bugs caused by incrementing or
3710 decrementing a variable inside a call to log_debug(). Since
3711 log_debug() is a macro whose arguments are conditionally
3712 evaluated, it is usually an error to do this. One such bug was
3713 30628, in which SENDME cells were miscounted by a decrement
3714 operator inside a log_debug() call. Closes ticket 30743.
3716 o Minor features (onion service v3):
3717 - Do not allow single hop clients to fetch or post an HS descriptor
3718 from an HSDir. Closes ticket 24964.
3720 o Minor features (onion service):
3721 - Disallow single-hop clients at the introduction point. We've
3722 removed Tor2web support a while back and single-hop rendezvous
3723 attempts are blocked at the relays. This change should remove load
3724 off the network from spammy clients. Close ticket 24963.
3726 o Minor features (onion services v3):
3727 - Assist users who try to setup v2 client authorization in v3 onion
3728 services by pointing them to the right documentation. Closes
3731 o Minor features (stem tests):
3732 - Change "make test-stem" so it only runs the stem tests that use
3733 tor. This change makes test-stem faster and more reliable. Closes
3736 o Minor features (testing):
3737 - When running tests that attempt to look up hostnames, replace the
3738 libc name lookup functions with ones that do not actually touch
3739 the network. This way, the tests complete more quickly in the
3740 presence of a slow or missing DNS resolver. Closes ticket 31841.
3741 - Add a script to invoke "tor --dump-config" and "tor
3742 --verify-config" with various configuration options, and see
3743 whether tor's resulting configuration or error messages are what
3744 we expect. Use it for integration testing of our +Option and
3745 /Option flags. Closes ticket 31637.
3746 - Improve test coverage for our existing configuration parsing and
3747 management API. Closes ticket 30893.
3748 - Add integration tests to make sure that practracker gives the
3749 outputs we expect. Closes ticket 31477.
3750 - The practracker self-tests are now run as part of the Tor test
3751 suite. Closes ticket 31304.
3753 o Minor features (testing, continuous integration):
3754 - Disable all but one Travis CI macOS build, to mitigate slow
3755 scheduling of Travis macOS jobs. Closes ticket 32177.
3756 - Run the chutney IPv6 networks as part of Travis CI. Closes
3758 - Simplify the Travis CI build matrix, and optimise for build time.
3759 Closes ticket 31859.
3760 - Use Windows Server 2019 instead of Windows Server 2016 in our
3761 Appveyor builds. Closes ticket 32086.
3763 o Minor features (token bucket):
3764 - Implement a generic token bucket that uses a single counter, for
3765 use in anti-DoS onion service work. Closes ticket 30687.
3767 o Minor bugfixes (Appveyor continuous integration):
3768 - Avoid spurious errors when Appveyor CI fails before the install
3769 step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
3771 o Minor bugfixes (best practices tracker):
3772 - Fix a few issues in the best-practices script, including tests,
3773 tab tolerance, error reporting, and directory-exclusion logic.
3774 Fixes bug 29746; bugfix on 0.4.1.1-alpha.
3775 - When running check-best-practices, only consider files in the src
3776 subdirectory. Previously we had recursively considered all
3777 subdirectories, which made us get confused by the temporary
3778 directories made by "make distcheck". Fixes bug 31578; bugfix
3781 o Minor bugfixes (build system):
3782 - Interpret "--disable-module-dirauth=no" correctly. Fixes bug
3783 32124; bugfix on 0.3.4.1-alpha.
3784 - Interpret "--with-tcmalloc=no" correctly. Fixes bug 32124; bugfix
3786 - Stop failing when jemalloc is requested, but tcmalloc is not
3787 found. Fixes bug 32124; bugfix on 0.3.5.1-alpha.
3788 - When pkg-config is not installed, or a library that depends on
3789 pkg-config is not found, tell the user what to do to fix the
3790 problem. Fixes bug 31922; bugfix on 0.3.1.1-alpha.
3791 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
3792 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
3794 o Minor bugfixes (chutney, makefiles, documentation):
3795 - "make test-network-all" now shows the warnings from each test-
3796 network.sh run on the console, so developers see new warnings
3797 early. We've also improved the documentation for this feature, and
3798 renamed a Makefile variable so the code is self-documenting. Fixes
3799 bug 30455; bugfix on 0.3.0.4-rc.
3801 o Minor bugfixes (client, onion service v3):
3802 - Fix a BUG() assertion that occurs within a very small race window
3803 between when a client intro circuit opens and when its descriptor
3804 gets cleaned up from the cache. The circuit is now closed early,
3805 which will trigger a re-fetch of the descriptor and continue the
3806 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
3808 o Minor bugfixes (code quality):
3809 - Fix "make check-includes" so it runs correctly on out-of-tree
3810 builds. Fixes bug 31335; bugfix on 0.3.5.1-alpha.
3812 o Minor bugfixes (compilation):
3813 - Add more stub functions to fix compilation on Android with link-
3814 time optimization when --disable-module-dirauth is used.
3815 Previously, these compilation settings would make the compiler
3816 look for functions that didn't exist. Fixes bug 31552; bugfix
3818 - Suppress spurious float-conversion warnings from GCC when calling
3819 floating-point classifier functions on FreeBSD. Fixes part of bug
3820 31687; bugfix on 0.3.1.5-alpha.
3822 o Minor bugfixes (configuration):
3823 - Invalid floating-point values in the configuration file are now
3824 treated as errors in the configuration. Previously, they were
3825 ignored and treated as zero. Fixes bug 31475; bugfix on 0.0.1.
3827 o Minor bugfixes (connections):
3828 - Avoid trying to read data from closed connections, which can cause
3829 needless loops in Libevent and infinite loops in Shadow. Fixes bug
3830 30344; bugfix on 0.1.1.1-alpha.
3832 o Minor bugfixes (controller protocol):
3833 - Fix the MAPADDRESS controller command to accept one or more
3834 arguments. Previously, it required two or more arguments, and
3835 ignored the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
3837 o Minor bugfixes (coverity):
3838 - Add an assertion when parsing a BEGIN cell so that coverity can be
3839 sure that we are not about to dereference a NULL address. Fixes
3840 bug 31026; bugfix on 0.2.4.7-alpha. This is CID 1447296.
3841 - In our siphash implementation, when building for coverity, use
3842 memcpy in place of a switch statement, so that coverity can tell
3843 we are not accessing out-of-bounds memory. Fixes bug 31025; bugfix
3844 on 0.2.8.1-alpha. This is tracked as CID 1447293 and 1447295.
3845 - Fix several coverity warnings from our unit tests. Fixes bug
3846 31030; bugfix on 0.2.4.1-alpha, 0.3.2.1-alpha, and 0.4.0.1-alpha.
3848 o Minor bugfixes (crash):
3849 - When running Tor with an option like --verify-config or
3850 --dump-config that does not start the event loop, avoid crashing
3851 if we try to exit early because of an error. Fixes bug 32407;
3852 bugfix on 0.3.3.1-alpha.
3854 o Minor bugfixes (developer tooling):
3855 - Only log git script changes in the post-merge script when the
3856 merge was to the master branch. Fixes bug 31040; bugfix
3859 o Minor bugfixes (directory authorities):
3860 - Return a distinct status when formatting annotations fails. Fixes
3861 bug 30780; bugfix on 0.2.0.8-alpha.
3863 o Minor bugfixes (error handling):
3864 - Always lock the backtrace buffer before it is used. Fixes bug
3865 31734; bugfix on 0.2.5.3-alpha.
3866 - On abort, try harder to flush the output buffers of log messages.
3867 On some platforms (macOS), log messages could be discarded when
3868 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
3869 - Report the tor version whenever an assertion fails. Previously, we
3870 only reported the Tor version on some crashes, and some non-fatal
3871 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
3872 - When tor aborts due to an error, close log file descriptors before
3873 aborting. Closing the logs makes some OSes flush log file buffers,
3874 rather than deleting buffered log lines. Fixes bug 31594; bugfix
3877 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6):
3878 - When extracting an IPv6 address from a PF-based proxy, verify that
3879 we are actually configured to receive an IPv6 address, and log an
3880 internal error if not. Fixes part of bug 31687; bugfix
3883 o Minor bugfixes (git hooks):
3884 - Remove a duplicate call to practracker from the pre-push hook. The
3885 pre-push hook already calls the pre-commit hook, which calls
3886 practracker. Fixes bug 31462; bugfix on 0.4.1.1-alpha.
3888 o Minor bugfixes (git scripts):
3889 - Stop hard-coding the bash path in the git scripts. Some OSes don't
3890 have bash in /usr/bin, others have an ancient bash at this path.
3891 Fixes bug 30840; bugfix on 0.4.0.1-alpha.
3892 - Stop hard-coding the tor master branch name and worktree path in
3893 the git scripts. Fixes bug 30841; bugfix on 0.4.0.1-alpha.
3894 - Allow git-push-all.sh to be run from any directory. Previously,
3895 the script only worked if run from an upstream worktree directory.
3896 Closes ticket 31678.
3898 o Minor bugfixes (guards):
3899 - When tor is missing descriptors for some primary entry guards,
3900 make the log message less alarming. It's normal for descriptors to
3901 expire, as long as tor fetches new ones soon after. Fixes bug
3902 31657; bugfix on 0.3.3.1-alpha.
3904 o Minor bugfixes (ipv6):
3905 - Check for private IPv6 addresses alongside their IPv4 equivalents
3906 when authorities check descriptors. Previously, we only checked
3907 for private IPv4 addresses. Fixes bug 31088; bugfix on
3908 0.2.3.21-rc. Patch by Neel Chauhan.
3909 - When parsing microdescriptors, we should check the IPv6 exit
3910 policy alongside IPv4. Previously, we checked both exit policies
3911 for only router info structures, while microdescriptors were
3912 IPv4-only. Fixes bug 27284; bugfix on 0.2.3.1-alpha. Patch by
3915 o Minor bugfixes (logging):
3916 - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
3917 uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
3918 - Disable backtrace signal handlers when shutting down tor. Fixes
3919 bug 31614; bugfix on 0.2.5.2-alpha.
3920 - Rate-limit our the logging message about the obsolete .exit
3921 notation. Previously, there was no limit on this warning, which
3922 could potentially be triggered many times by a hostile website.
3923 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
3924 - When initialising log domain masks, only set known log domains.
3925 Fixes bug 31854; bugfix on 0.2.1.1-alpha.
3926 - Change log level of message "Hash of session info was not as
3927 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
3929 - Fix a code issue that would have broken our parsing of log domains
3930 as soon as we had 33 of them. Fortunately, we still only have 29.
3931 Fixes bug 31451; bugfix on 0.4.1.4-rc.
3933 o Minor bugfixes (logging, protocol violations):
3934 - Do not log a nonfatal assertion failure when receiving a VERSIONS
3935 cell on a connection using the obsolete v1 link protocol. Log a
3936 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
3938 o Minor bugfixes (mainloop, periodic events, in-process API):
3939 - Reset the periodic events' "enabled" flag when Tor is shut down
3940 cleanly. Previously, this flag was left on, which caused periodic
3941 events not to be re-enabled when Tor was relaunched in-process
3942 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
3945 o Minor bugfixes (memory management):
3946 - Stop leaking a small amount of memory in nt_service_install(), in
3947 unreachable code. Fixes bug 30799; bugfix on 0.2.0.7-alpha. Patch
3950 o Minor bugfixes (modules):
3951 - Explain what the optional Directory Authority module is, and what
3952 happens when it is disabled. Fixes bug 31825; bugfix
3955 o Minor bugfixes (multithreading):
3956 - Avoid some undefined behaviour when freeing mutexes. Fixes bug
3957 31736; bugfix on 0.0.7.
3959 o Minor bugfixes (networking, IP addresses):
3960 - When parsing addresses via Tor's internal DNS lookup API, reject
3961 IPv4 addresses in square brackets, and accept IPv6 addresses in
3962 square brackets. This change completes the work started in 23082,
3963 making address parsing consistent between tor's internal DNS
3964 lookup and address parsing APIs. Fixes bug 30721; bugfix
3966 - When parsing addresses via Tor's internal address:port parsing and
3967 DNS lookup APIs, require IPv6 addresses with ports to have square
3968 brackets. But allow IPv6 addresses without ports, whether or not
3969 they have square brackets. Fixes bug 30721; bugfix
3972 o Minor bugfixes (onion service v3):
3973 - When purging the client descriptor cache, close any introduction
3974 point circuits associated with purged cache entries. This avoids
3975 picking those circuits later when connecting to the same
3976 introduction points. Fixes bug 30921; bugfix on 0.3.2.1-alpha.
3978 o Minor bugfixes (onion services):
3979 - In the hs_ident_circuit_t data structure, remove the unused field
3980 circuit_type and the respective argument in hs_ident_circuit_new().
3981 This field was set by clients (for introduction) and services (for
3982 introduction and rendezvous) but was never used afterwards. Fixes
3983 bug 31490; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
3985 o Minor bugfixes (operator tools):
3986 - Make tor-print-ed-signing-cert(1) print certificate expiration
3987 date in RFC 1123 and UNIX timestamp formats, to make output
3988 machine readable. Fixes bug 31012; bugfix on 0.3.5.1-alpha.
3990 o Minor bugfixes (process management):
3991 - Remove overly strict assertions that triggered when a pluggable
3992 transport failed to launch. Fixes bug 31091; bugfix
3994 - Remove an assertion in the Unix process backend. This assertion
3995 would trigger when we failed to find the executable for a child
3996 process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
3998 o Minor bugfixes (relay):
3999 - Avoid crashing when starting with a corrupt keys directory where
4000 the old ntor key and the new ntor key are identical. Fixes bug
4001 30916; bugfix on 0.2.4.8-alpha.
4003 o Minor bugfixes (rust):
4004 - Correctly exclude a redundant rust build job in Travis. Fixes bug
4005 31463; bugfix on 0.3.5.4-alpha.
4006 - Raise the minimum rustc version to 1.31.0, as checked by configure
4007 and CI. Fixes bug 31442; bugfix on 0.3.5.4-alpha.
4009 o Minor bugfixes (sendme, code structure):
4010 - Rename the trunnel SENDME file definition from sendme.trunnel to
4011 sendme_cell.trunnel to avoid having twice sendme.{c|h} in the
4012 repository. Fixes bug 30769; bugfix on 0.4.1.1-alpha.
4014 o Minor bugfixes (statistics):
4015 - Stop removing the ed25519 signature if the extra info file is too
4016 big. If the signature data was removed, but the keyword was kept,
4017 this could result in an unparseable extra info file. Fixes bug
4018 30958; bugfix on 0.2.7.2-alpha.
4020 o Minor bugfixes (subsystems):
4021 - Make the subsystem init order match the subsystem module
4022 dependencies. Call windows process security APIs as early as
4023 possible. Initialize logging before network and time, so that
4024 network and time can use logging. Fixes bug 31615; bugfix
4027 o Minor bugfixes (testing):
4028 - Avoid intermittent test failures due to a test that had relied on
4029 inconsistent timing sources. Fixes bug 31995; bugfix
4031 - When testing port rebinding, don't busy-wait for tor to log.
4032 Instead, actually sleep for a short time before polling again.
4033 Also improve the formatting of control commands and log messages.
4034 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
4035 - Teach the util/socketpair_ersatz test to work correctly when we
4036 have no network stack configured. Fixes bug 30804; bugfix
4039 o Minor bugfixes (tests, SunOS):
4040 - Avoid a map_anon_nofork test failure due to a signed/unsigned
4041 integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
4043 o Minor bugfixes (tls, logging):
4044 - Log bugs about the TLS read buffer's length only once, rather than
4045 filling the logs with similar warnings. Fixes bug 31939; bugfix
4048 o Minor bugfixes (v2 single onion services):
4049 - Always retry v2 single onion service intro and rend circuits with
4050 a 3-hop path. Previously, v2 single onion services used a 3-hop
4051 path when rendezvous circuits were retried after a remote or
4052 delayed failure, but a 1-hop path for immediate retries. Fixes bug
4053 23818; bugfix on 0.2.9.3-alpha.
4055 o Minor bugfixes (v3 onion services):
4056 - When cleaning up intro circuits for a v3 onion service, don't
4057 remove circuits that have an established or pending circuit, even
4058 if they ran out of retries. This way, we don't remove a circuit on
4059 its last retry. Fixes bug 31652; bugfix on 0.3.2.1-alpha.
4061 o Minor bugfixes (v3 single onion services):
4062 - Always retry v3 single onion service intro and rend circuits with
4063 a 3-hop path. Previously, v3 single onion services used a 3-hop
4064 path when rend circuits were retried after a remote or delayed
4065 failure, but a 1-hop path for immediate retries. Fixes bug 23818;
4066 bugfix on 0.3.2.1-alpha.
4067 - Make v3 single onion services fall back to a 3-hop intro, when all
4068 intro points are unreachable via a 1-hop path. Previously, v3
4069 single onion services failed when all intro nodes were unreachable
4070 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
4072 o Code simplification and refactoring:
4073 - Refactor connection_control_process_inbuf() to reduce the size of
4074 a practracker exception. Closes ticket 31840.
4075 - Refactor the microdescs_parse_from_string() function into smaller
4076 pieces, for better comprehensibility. Closes ticket 31675.
4077 - Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit
4078 tests and fuzzers, rather than using hard-coded values. Closes
4080 - Interface for function `decrypt_desc_layer` cleaned up. Closes
4084 - Correct the description of "GuardLifetime". Fixes bug 31189;
4085 bugfix on 0.3.0.1-alpha.
4086 - Make clear in the man page, in both the bandwidth section and the
4087 AccountingMax section, that Tor counts in powers of two, not
4088 powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
4089 bytes. Resolves ticket 32106.
4090 - Document the signal-safe logging behaviour in the tor man page.
4091 Also add some comments to the relevant functions. Closes
4093 - Explain why we can't destroy the backtrace buffer mutex. Explain
4094 why we don't need to destroy the log mutex. Closes ticket 31736.
4095 - The Tor source code repository now includes a (somewhat dated)
4096 description of Tor's modular architecture, in doc/HACKING/design.
4097 This is based on the old "tor-guts.git" repository, which we are
4098 adopting and superseding. Closes ticket 31849.
4099 - Improve documentation in circuit padding subsystem. Patch by
4100 Tobias Pulls. Closes ticket 31113.
4101 - Include an example usage for IPv6 ORPort in our sample torrc.
4102 Closes ticket 31320; patch from Ali Raheem.
4103 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
4104 notice.html so that operators no longer have to host it
4105 themselves. Closes ticket 31089.
4108 - No longer include recommended package digests in votes as detailed
4109 in proposal 301. The RecommendedPackages torrc option is
4110 deprecated and will no longer have any effect. "package" lines
4111 will still be considered when computing consensuses for consensus
4112 methods that include them. (This change has no effect on the list
4113 of recommended Tor versions, which is still in use.) Closes
4115 - Remove torctl.in from contrib/dist directory. Resolves
4119 - Require C99 standards-conforming code in Travis CI, but allow GNU
4120 gcc extensions. Also activates clang's -Wtypedef-redefinition
4121 warnings. Build some jobs with -std=gnu99, and some jobs without.
4122 Closes ticket 32500.
4123 - Run shellcheck for all non-third-party shell scripts that are
4124 shipped with Tor. Closes ticket 29533.
4125 - When checking shell scripts, ignore any user-created directories.
4126 Closes ticket 30967.
4128 o Code simplification and refactoring (config handling):
4129 - Extract our variable manipulation code from confparse.c to a new
4130 lower-level typedvar.h module. Closes ticket 30864.
4131 - Lower another layer of object management from confparse.c to a
4132 more general tool. Now typed structure members are accessible via
4133 an abstract type. Implements ticket 30914.
4134 - Move our backend logic for working with configuration and state
4135 files into a lower-level library, since it no longer depends on
4136 any tor-specific functionality. Closes ticket 31626.
4137 - Numerous simplifications in configuration-handling logic: remove
4138 duplicated macro definitions, replace magical names with flags,
4139 and refactor "TestingTorNetwork" to use the same default-option
4140 logic as the rest of Tor. Closes ticket 30935.
4141 - Replace our ad-hoc set of flags for configuration variables and
4142 configuration variable types with fine-grained orthogonal flags
4143 corresponding to the actual behavior we want. Closes ticket 31625.
4145 o Code simplification and refactoring (misc):
4146 - Eliminate some uses of lower-level control reply abstractions,
4147 primarily in the onion_helper functions. Closes ticket 30889.
4148 - Rework bootstrap tracking to use the new publish-subscribe
4149 subsystem. Closes ticket 29976.
4150 - Rewrite format_node_description() and router_get_verbose_nickname()
4151 to use strlcpy() and strlcat(). The previous implementation used
4152 memcpy() and pointer arithmetic, which was error-prone. Closes
4153 ticket 31545. This is CID 1452819.
4154 - Split extrainfo_dump_to_string() into smaller functions. Closes
4156 - Use the ptrdiff_t type consistently for expressing variable
4157 offsets and pointer differences. Previously we incorrectly (but
4158 harmlessly) used int and sometimes off_t for these cases. Closes
4160 - Use the subsystems mechanism to manage the main event loop code.
4161 Closes ticket 30806.
4162 - Various simplifications and minor improvements to the circuit
4163 padding machines. Patch by Tobias Pulls. Closes tickets 31112
4166 o Documentation (hard-coded directories):
4167 - Improve the documentation for the DirAuthority and FallbackDir
4168 torrc options. Closes ticket 30955.
4170 o Documentation (tor.1 man page):
4171 - Fix typo in tor.1 man page: the option is "--help", not "-help".
4172 Fixes bug 31008; bugfix on 0.2.2.9-alpha.
4174 o Testing (continuous integration):
4175 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
4176 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
4177 until we can fix some Bionic permissions issues (see ticket
4178 32240). Related to ticket 31919.
4179 - Install the mingw OpenSSL package in Appveyor. This makes sure
4180 that the OpenSSL headers and libraries match in Tor's Appveyor
4181 builds. (This bug was triggered by an Appveyor image update.)
4182 Fixes bug 32449; bugfix on 0.3.5.6-rc.
4183 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
4186 Changes in version 0.4.1.7 - 2019-12-09
4187 This release backports several bugfixes to improve stability and
4188 correctness. Anyone experiencing build problems or crashes with 0.4.1.6,
4189 including all relays relying on AccountingMax, should upgrade.
4191 o Major features (directory authorities, backport from 0.4.2.2-alpha):
4192 - Directory authorities now reject relays running all currently
4193 deprecated release series. The currently supported release series
4194 are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
4196 o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha):
4197 - Avoid a possible crash when restarting Tor in embedded mode and
4198 enabling a different set of publish/subscribe messages. Fixes bug
4199 31898; bugfix on 0.4.1.1-alpha.
4201 o Major bugfixes (relay, backport from 0.4.2.3-alpha):
4202 - Relays now respect their AccountingMax bandwidth again. When
4203 relays entered "soft" hibernation (which typically starts when
4204 we've hit 90% of our AccountingMax), we had stopped checking
4205 whether we should enter hard hibernation. Soft hibernation refuses
4206 new connections and new circuits, but the existing circuits can
4207 continue, meaning that relays could have exceeded their configured
4208 AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
4210 o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
4211 - Stop ignoring torrc options after an %include directive, when the
4212 included directory ends with a file that does not contain any
4213 config options (but does contain comments or whitespace). Fixes
4214 bug 31408; bugfix on 0.3.1.1-alpha.
4216 o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
4217 - Onion services now always use the exact number of intro points
4218 configured with the HiddenServiceNumIntroductionPoints option (or
4219 fewer if nodes are excluded). Before, a service could sometimes
4220 pick more intro points than configured. Fixes bug 31548; bugfix
4223 o Minor features (continuous integration, backport from 0.4.2.2-alpha):
4224 - When building on Appveyor and Travis, pass the "-k" flag to make,
4225 so that we are informed of all compilation failures, not just the
4226 first one or two. Closes ticket 31372.
4228 o Minor features (geoip, backport from 0.4.2.5):
4229 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
4230 Country database. Closes ticket 32685.
4232 o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
4233 - Avoid spurious errors when Appveyor CI fails before the install step.
4234 Fixes bug 31884; bugfix on 0.3.4.2-alpha.
4236 o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
4237 - Fix a BUG() assertion that occurs within a very small race window
4238 between when a client intro circuit opens and when its descriptor
4239 gets cleaned up from the cache. The circuit is now closed early,
4240 which will trigger a re-fetch of the descriptor and continue the
4241 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
4243 o Minor bugfixes (connections, backport from 0.4.2.3-rc):
4244 - Avoid trying to read data from closed connections, which can cause
4245 needless loops in Libevent and infinite loops in Shadow. Fixes bug
4246 30344; bugfix on 0.1.1.1-alpha.
4248 o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
4249 - On abort, try harder to flush the output buffers of log messages.
4250 On some platforms (macOS), log messages could be discarded when
4251 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
4252 - Report the tor version whenever an assertion fails. Previously, we
4253 only reported the Tor version on some crashes, and some non-fatal
4254 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
4255 - When tor aborts due to an error, close log file descriptors before
4256 aborting. Closing the logs makes some OSes flush log file buffers,
4257 rather than deleting buffered log lines. Fixes bug 31594; bugfix
4260 o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
4261 - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
4262 uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
4263 - Disable backtrace signal handlers when shutting down tor. Fixes
4264 bug 31614; bugfix on 0.2.5.2-alpha.
4265 - Rate-limit our the logging message about the obsolete .exit
4266 notation. Previously, there was no limit on this warning, which
4267 could potentially be triggered many times by a hostile website.
4268 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
4270 o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
4271 - Do not log a nonfatal assertion failure when receiving a VERSIONS
4272 cell on a connection using the obsolete v1 link protocol. Log a
4273 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
4275 o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
4276 - Reset the periodic events' "enabled" flag when Tor is shut down
4277 cleanly. Previously, this flag was left on, which caused periodic
4278 events not to be re-enabled when Tor was relaunched in-process
4279 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
4282 o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha):
4283 - Avoid some undefined behaviour when freeing mutexes. Fixes bug
4284 31736; bugfix on 0.0.7.
4286 o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
4287 - Remove overly strict assertions that triggered when a pluggable
4288 transport failed to launch. Fixes bug 31091; bugfix
4290 - Remove an assertion in the Unix process backend. This assertion
4291 would trigger when we failed to find the executable for a child
4292 process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
4294 o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
4295 - Avoid crashing when starting with a corrupt keys directory where
4296 the old ntor key and the new ntor key are identical. Fixes bug
4297 30916; bugfix on 0.2.4.8-alpha.
4299 o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
4300 - When testing port rebinding, don't busy-wait for tor to log.
4301 Instead, actually sleep for a short time before polling again.
4302 Also improve the formatting of control commands and log messages.
4303 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
4305 o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha):
4306 - Avoid a map_anon_nofork test failure due to a signed/unsigned
4307 integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
4309 o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
4310 - Log bugs about the TLS read buffer's length only once, rather than
4311 filling the logs with similar warnings. Fixes bug 31939; bugfix
4314 o Documentation (backport from 0.4.2.2-alpha):
4315 - Explain why we can't destroy the backtrace buffer mutex. Explain
4316 why we don't need to destroy the log mutex. Closes ticket 31736.
4318 o Testing (continuous integration, backport from 0.4.2.3-alpha):
4319 - Disable all but one Travis CI macOS build, to mitigate slow
4320 scheduling of Travis macOS jobs. Closes ticket 32177.
4321 - Run the chutney IPv6 networks as part of Travis CI. Closes
4323 - Simplify the Travis CI build matrix, and optimise for build time.
4324 Closes ticket 31859.
4325 - Use Windows Server 2019 instead of Windows Server 2016 in our
4326 Appveyor builds. Closes ticket 32086.
4328 o Testing (continuous integration, backport from 0.4.2.4-rc):
4329 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
4330 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
4331 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
4332 until we can fix some Bionic permissions issues (see ticket
4333 32240). Related to ticket 31919.
4334 - Install the mingw OpenSSL package in Appveyor. This makes sure
4335 that the OpenSSL headers and libraries match in Tor's Appveyor
4336 builds. (This bug was triggered by an Appveyor image update.)
4337 Fixes bug 32449; bugfix on 0.3.5.6-rc.
4339 o Testing (continuous integration, backport from 0.4.2.5):
4340 - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
4341 extensions. Also activates clang's -Wtypedef-redefinition warnings.
4342 Build some jobs with -std=gnu99, and some jobs without.
4343 Closes ticket 32500.
4346 Changes in version 0.4.0.6 - 2019-12-09
4347 This is the second stable release in the 0.4.0.x series. This release
4348 backports several bugfixes to improve stability and correctness. Anyone
4349 experiencing build problems or crashes with 0.4.0.5, including all relays
4350 relying on AccountingMax, should upgrade.
4352 Note that, per our support policy, support for the 0.4.0.x series will end
4353 on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the
4354 latest stable release, or downgrade to 0.3.5.x, which will get long-term
4355 support until 1 Feb 2022.
4357 o Directory authority changes (backport from 0.4.1.5):
4358 - The directory authority "dizum" has a new IP address. Closes
4361 o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
4362 - Consider our directory information to have changed when our list
4363 of bridges changes. Previously, Tor would not re-compute the
4364 status of its directory information when bridges changed, and
4365 therefore would not realize that it was no longer able to build
4366 circuits. Fixes part of bug 29875.
4367 - Do not count previously configured working bridges towards our
4368 total of working bridges. Previously, when Tor's list of bridges
4369 changed, it would think that the old bridges were still usable,
4370 and delay fetching router descriptors for the new ones. Fixes part
4371 of bug 29875; bugfix on 0.3.0.1-alpha.
4373 o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
4374 - When considering upgrading circuits from "waiting for guard" to
4375 "open", always ignore circuits that are marked for close. Otherwise,
4376 we can end up in the situation where a subsystem is notified that
4377 a closing circuit has just opened, leading to undesirable
4378 behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
4380 o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
4381 - Properly clean up the introduction point map when circuits change
4382 purpose from onion service circuits to pathbias, measurement, or
4383 other circuit types. This should fix some service-side instances
4384 of introduction point failure. Fixes bug 29034; bugfix
4387 o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
4388 - Fix an unreachable bug in which an introduction point could try to
4389 send an INTRODUCE_ACK with a status code that Trunnel would refuse
4390 to encode, leading the relay to assert(). We've consolidated the
4391 ABI values into Trunnel now. Fixes bug 30454; bugfix
4393 - Clients can now handle unknown status codes from INTRODUCE_ACK
4394 cells. (The NACK behavior will stay the same.) This will allow us
4395 to extend status codes in the future without breaking the normal
4396 client behavior. Fixes another part of bug 30454; bugfix
4399 o Major bugfixes (relay, backport from 0.4.2.3-alpha):
4400 - Relays now respect their AccountingMax bandwidth again. When
4401 relays entered "soft" hibernation (which typically starts when
4402 we've hit 90% of our AccountingMax), we had stopped checking
4403 whether we should enter hard hibernation. Soft hibernation refuses
4404 new connections and new circuits, but the existing circuits can
4405 continue, meaning that relays could have exceeded their configured
4406 AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
4408 o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
4409 - Stop ignoring torrc options after an %include directive, when the
4410 included directory ends with a file that does not contain any
4411 config options (but does contain comments or whitespace). Fixes
4412 bug 31408; bugfix on 0.3.1.1-alpha.
4414 o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
4415 - Onion services now always use the exact number of intro points
4416 configured with the HiddenServiceNumIntroductionPoints option (or
4417 fewer if nodes are excluded). Before, a service could sometimes
4418 pick more intro points than configured. Fixes bug 31548; bugfix
4421 o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
4422 - Add a "--list-modules" command to print a list of which compile-
4423 time modules are enabled. Closes ticket 30452.
4425 o Minor features (continuous integration, backport from 0.4.1.1-alpha):
4426 - Remove sudo configuration lines from .travis.yml as they are no
4427 longer needed with current Travis build environment. Resolves
4430 o Minor features (continuous integration, backport from 0.4.1.4-rc):
4431 - Our Travis configuration now uses Chutney to run some network
4432 integration tests automatically. Closes ticket 29280.
4434 o Minor features (continuous integration, backport from 0.4.2.2-alpha):
4435 - When building on Appveyor and Travis, pass the "-k" flag to make,
4436 so that we are informed of all compilation failures, not just the
4437 first one or two. Closes ticket 31372.
4439 o Minor features (fallback directory list, backport from 0.4.1.4-rc):
4440 - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
4441 in December 2018 (of which ~122 were still functional), with a
4442 list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
4443 in June 2019. Closes ticket 28795.
4445 o Minor features (geoip, backport from 0.4.2.5):
4446 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
4447 Country database. Closes ticket 32685.
4449 o Minor features (stem tests, backport from 0.4.2.1-alpha):
4450 - Change "make test-stem" so it only runs the stem tests that use
4451 tor. This change makes test-stem faster and more reliable. Closes
4454 o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
4455 - Avoid spurious errors when Appveyor CI fails before the install step.
4456 Fixes bug 31884; bugfix on 0.3.4.2-alpha.
4458 o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
4459 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
4460 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
4462 o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
4463 - Fix a logic error that prevented the SessionGroup sub-option from
4464 being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
4466 o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc):
4467 - On relays, properly check that a padding machine is absent before
4468 logging a warning about it being absent. Fixes bug 30649; bugfix
4471 o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
4472 - Fix a BUG() assertion that occurs within a very small race window
4473 between when a client intro circuit opens and when its descriptor
4474 gets cleaned up from the cache. The circuit is now closed early,
4475 which will trigger a re-fetch of the descriptor and continue the
4476 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
4478 o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
4479 - Don't believe clock skew results from NETINFO cells that appear to
4480 arrive before we sent the VERSIONS cells they are responding to.
4481 Previously, we would accept them up to 3 minutes "in the past".
4482 Fixes bug 31343; bugfix on 0.2.4.4-alpha.
4484 o Minor bugfixes (compilation warning, backport from 0.4.1.5):
4485 - Fix a compilation warning on Windows about casting a function
4486 pointer for GetTickCount64(). Fixes bug 31374; bugfix
4489 o Minor bugfixes (compilation, backport from 0.4.1.5):
4490 - Avoid using labs() on time_t, which can cause compilation warnings
4491 on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
4493 o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
4494 - Suppress spurious float-conversion warnings from GCC when calling
4495 floating-point classifier functions on FreeBSD. Fixes part of bug
4496 31687; bugfix on 0.3.1.5-alpha.
4498 o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
4499 - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
4500 due to missing declarations of abort(), and prevent other such
4501 failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
4503 o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
4504 - Fix a bug that prevented us from supporting SOCKS5 proxies that
4505 want authentication along with configured (but unused!)
4506 ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
4508 o Minor bugfixes (connections, backport from 0.4.2.3-rc):
4509 - Avoid trying to read data from closed connections, which can cause
4510 needless loops in Libevent and infinite loops in Shadow. Fixes bug
4511 30344; bugfix on 0.1.1.1-alpha.
4513 o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
4514 - Allow the test-stem job to fail in Travis, because it sometimes
4515 hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
4516 - Skip test_rebind on macOS in Travis, because it is unreliable on
4517 macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
4518 - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
4519 variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
4521 o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
4522 - Avoid a set of possible code paths that could try to use freed
4523 memory in routerlist_free() while Tor was exiting. Fixes bug
4524 31003; bugfix on 0.1.2.2-alpha.
4526 o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
4527 - Stop crashing after parsing an unknown descriptor purpose
4528 annotation. We think this bug can only be triggered by modifying a
4529 local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
4531 o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
4532 - Move the "bandwidth-file-headers" line in directory authority
4533 votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
4536 o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
4537 - On abort, try harder to flush the output buffers of log messages.
4538 On some platforms (macOS), log messages could be discarded when
4539 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
4540 - Report the tor version whenever an assertion fails. Previously, we
4541 only reported the Tor version on some crashes, and some non-fatal
4542 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
4544 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
4545 - When extracting an IPv6 address from a PF-based proxy, verify that
4546 we are actually configured to receive an IPv6 address, and log an
4547 internal error if not. Fixes part of bug 31687; bugfix
4550 o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
4551 - When tor is missing descriptors for some primary entry guards,
4552 make the log message less alarming. It's normal for descriptors to
4553 expire, as long as tor fetches new ones soon after. Fixes bug
4554 31657; bugfix on 0.3.3.1-alpha.
4556 o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
4557 - Do not log a warning when running with an OpenSSL version other
4558 than the one Tor was compiled with, if the two versions should be
4559 compatible. Previously, we would warn whenever the version was
4560 different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
4562 o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
4563 - Change log level of message "Hash of session info was not as
4564 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
4567 o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
4568 - Rate-limit our the logging message about the obsolete .exit
4569 notation. Previously, there was no limit on this warning, which
4570 could potentially be triggered many times by a hostile website.
4571 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
4573 o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
4574 - Do not log a nonfatal assertion failure when receiving a VERSIONS
4575 cell on a connection using the obsolete v1 link protocol. Log a
4576 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
4578 o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
4579 - Reset the periodic events' "enabled" flag when Tor is shut down
4580 cleanly. Previously, this flag was left on, which caused periodic
4581 events not to be re-enabled when Tor was relaunched in-process
4582 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
4585 o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
4586 - Avoid a minor memory leak that could occur on relays when failing
4587 to create a "keys" directory. Fixes bug 30148; bugfix
4590 o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
4591 - Fix a trivial memory leak when parsing an invalid value
4592 from a download schedule in the configuration. Fixes bug
4593 30894; bugfix on 0.3.4.1-alpha.
4595 o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha):
4596 - Fix usage of minherit() on NetBSD and other platforms that define
4597 MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
4598 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
4600 o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
4601 - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
4602 implemenation) when failing to load an onion service client
4603 authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
4605 o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
4606 - When purging the DNS cache because of an out-of-memory condition,
4607 try purging just the older entries at first. Previously, we would
4608 always purge the whole thing. Fixes bug 29617; bugfix
4611 o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
4612 - Avoid crashing in our tor_vasprintf() implementation on systems
4613 that define neither vasprintf() nor _vscprintf(). (This bug has
4614 been here long enough that we question whether people are running
4615 Tor on such systems, but we're applying the fix out of caution.)
4616 Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
4619 o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
4620 - Remove overly strict assertions that triggered when a pluggable
4621 transport failed to launch. Fixes bug 31091; bugfix
4623 - Remove an assertion in the Unix process backend. This assertion
4624 would trigger when we failed to find the executable for a child
4625 process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
4627 o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
4628 - Avoid crashing when starting with a corrupt keys directory where
4629 the old ntor key and the new ntor key are identical. Fixes bug
4630 30916; bugfix on 0.2.4.8-alpha.
4632 o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
4633 - Correctly exclude a redundant rust build job in Travis. Fixes bug
4634 31463; bugfix on 0.3.5.4-alpha.
4636 o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
4637 - When testing port rebinding, don't busy-wait for tor to log.
4638 Instead, actually sleep for a short time before polling again.
4639 Also improve the formatting of control commands and log messages.
4640 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
4642 o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
4643 - Log bugs about the TLS read buffer's length only once, rather than
4644 filling the logs with similar warnings. Fixes bug 31939; bugfix
4647 o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
4648 - Always retry v2 single onion service intro and rend circuits with
4649 a 3-hop path. Previously, v2 single onion services used a 3-hop
4650 path when rendezvous circuits were retried after a remote or
4651 delayed failure, but a 1-hop path for immediate retries. Fixes bug
4652 23818; bugfix on 0.2.9.3-alpha.
4653 - Make v3 single onion services fall back to a 3-hop intro, when all
4654 intro points are unreachable via a 1-hop path. Previously, v3
4655 single onion services failed when all intro nodes were unreachable
4656 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
4658 o Documentation (backport from 0.4.2.1-alpha):
4659 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
4660 notice.html so that operators no longer have to host it
4661 themselves. Closes ticket 31089.
4663 o Testing (backport from 0.4.1.2-alpha):
4664 - Specify torrc paths (with empty files) when launching tor in
4665 integration tests; refrain from reading user and system torrcs.
4666 Resolves issue 29702.
4668 o Testing (continuous integration, backport from 0.4.1.1-alpha):
4669 - In Travis, show stem's tor log after failure. Closes ticket 30234.
4671 o Testing (continuous integration, backport from 0.4.1.5):
4672 - In Travis, make stem log a controller trace to the console, and
4673 tail stem's tor log after failure. Closes ticket 30591.
4674 - In Travis, only run the stem tests that use a tor binary. Closes
4677 o Testing (continuous integration, backport from 0.4.2.3-alpha):
4678 - Disable all but one Travis CI macOS build, to mitigate slow
4679 scheduling of Travis macOS jobs. Closes ticket 32177.
4680 - Run the chutney IPv6 networks as part of Travis CI. Closes
4682 - Simplify the Travis CI build matrix, and optimise for build time.
4683 Closes ticket 31859.
4684 - Use Windows Server 2019 instead of Windows Server 2016 in our
4685 Appveyor builds. Closes ticket 32086.
4687 o Testing (continuous integration, backport from 0.4.2.4-rc):
4688 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
4689 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
4690 until we can fix some Bionic permissions issues (see ticket
4691 32240). Related to ticket 31919.
4692 - Install the mingw OpenSSL package in Appveyor. This makes sure
4693 that the OpenSSL headers and libraries match in Tor's Appveyor
4694 builds. (This bug was triggered by an Appveyor image update.)
4695 Fixes bug 32449; bugfix on 0.3.5.6-rc.
4696 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
4698 o Testing (continuous integration, backport from 0.4.2.5):
4699 - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
4700 extensions. Also activates clang's -Wtypedef-redefinition warnings.
4701 Build some jobs with -std=gnu99, and some jobs without.
4702 Closes ticket 32500.
4705 Changes in version 0.3.5.9 - 2019-12-09
4706 Tor 0.3.5.9 backports serveral fixes from later releases, including
4707 several that affect bridge users, relay stability, onion services,
4710 o Directory authority changes (backport from 0.4.1.5):
4711 - The directory authority "dizum" has a new IP address. Closes
4714 o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
4715 - Consider our directory information to have changed when our list
4716 of bridges changes. Previously, Tor would not re-compute the
4717 status of its directory information when bridges changed, and
4718 therefore would not realize that it was no longer able to build
4719 circuits. Fixes part of bug 29875.
4720 - Do not count previously configured working bridges towards our
4721 total of working bridges. Previously, when Tor's list of bridges
4722 changed, it would think that the old bridges were still usable,
4723 and delay fetching router descriptors for the new ones. Fixes part
4724 of bug 29875; bugfix on 0.3.0.1-alpha.
4726 o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
4727 - When considering upgrading circuits from "waiting for guard" to
4728 "open", always ignore circuits that are marked for close. Otherwise,
4729 we can end up in the situation where a subsystem is notified that
4730 a closing circuit has just opened, leading to undesirable
4731 behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
4733 o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc):
4734 - When running with NSS, disable TLS 1.2 ciphersuites that use
4735 SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
4736 these ciphersuites don't work -- which caused relays to fail to
4737 handshake with one another when these ciphersuites were enabled.
4738 Fixes bug 29241; bugfix on 0.3.5.1-alpha.
4740 o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
4741 - Properly clean up the introduction point map when circuits change
4742 purpose from onion service circuits to pathbias, measurement, or
4743 other circuit types. This should fix some service-side instances
4744 of introduction point failure. Fixes bug 29034; bugfix
4747 o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
4748 - Fix an unreachable bug in which an introduction point could try to
4749 send an INTRODUCE_ACK with a status code that Trunnel would refuse
4750 to encode, leading the relay to assert(). We've consolidated the
4751 ABI values into Trunnel now. Fixes bug 30454; bugfix
4753 - Clients can now handle unknown status codes from INTRODUCE_ACK
4754 cells. (The NACK behavior will stay the same.) This will allow us
4755 to extend status codes in the future without breaking the normal
4756 client behavior. Fixes another part of bug 30454; bugfix
4759 o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
4760 - Stop ignoring torrc options after an %include directive, when the
4761 included directory ends with a file that does not contain any
4762 config options (but does contain comments or whitespace). Fixes
4763 bug 31408; bugfix on 0.3.1.1-alpha.
4765 o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
4766 - Onion services now always use the exact number of intro points
4767 configured with the HiddenServiceNumIntroductionPoints option (or
4768 fewer if nodes are excluded). Before, a service could sometimes
4769 pick more intro points than configured. Fixes bug 31548; bugfix
4772 o Minor features (address selection, backport from 0.4.0.3-alpha):
4773 - Treat the subnet 100.64.0.0/10 as public for some purposes;
4774 private for others. This subnet is the RFC 6598 (Carrier Grade
4775 NAT) IP range, and is deployed by many ISPs as an alternative to
4776 RFC 1918 that does not break existing internal networks. Tor now
4777 blocks SOCKS and control ports on these addresses and warns users
4778 if client ports or ExtORPorts are listening on a RFC 6598 address.
4779 Closes ticket 28525. Patch by Neel Chauhan.
4781 o Minor features (bandwidth authority, backport from 0.4.0.4-rc):
4782 - Make bandwidth authorities ignore relays that are reported in the
4783 bandwidth file with the flag "vote=0". This change allows us to
4784 report unmeasured relays for diagnostic reasons without including
4785 their bandwidth in the bandwidth authorities' vote. Closes
4788 o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
4789 - Add a "--list-modules" command to print a list of which compile-
4790 time modules are enabled. Closes ticket 30452.
4792 o Minor features (continuous integration, backport from 0.4.0.4-rc):
4793 - On Travis Rust builds, cleanup Rust registry and refrain from
4794 caching the "target/" directory to speed up builds. Resolves
4797 o Minor features (continuous integration, backport from 0.4.0.5):
4798 - In Travis, tell timelimit to use stem's backtrace signals, and
4799 launch python directly from timelimit, so python receives the
4800 signals from timelimit, rather than make. Closes ticket 30117.
4802 o Minor features (continuous integration, backport from 0.4.1.1-alpha):
4803 - Remove sudo configuration lines from .travis.yml as they are no
4804 longer needed with current Travis build environment. Resolves
4807 o Minor features (continuous integration, backport from 0.4.1.4-rc):
4808 - Our Travis configuration now uses Chutney to run some network
4809 integration tests automatically. Closes ticket 29280.
4811 o Minor features (continuous integration, backport from 0.4.2.2-alpha):
4812 - When building on Appveyor and Travis, pass the "-k" flag to make,
4813 so that we are informed of all compilation failures, not just the
4814 first one or two. Closes ticket 31372.
4816 o Minor features (fallback directory list, backport from 0.4.1.4-rc):
4817 - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
4818 in December 2018 (of which ~122 were still functional), with a
4819 list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
4820 in June 2019. Closes ticket 28795.
4822 o Minor features (geoip, backport from 0.4.2.5):
4823 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
4824 Country database. Closes ticket 32685.
4826 o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc):
4827 - Try to log an error from NSS (if there is any) and a more useful
4828 description of our situation if we are using NSS and a call to
4829 SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
4831 o Minor features (stem tests, backport from 0.4.2.1-alpha):
4832 - Change "make test-stem" so it only runs the stem tests that use
4833 tor. This change makes test-stem faster and more reliable. Closes
4836 o Minor bugfixes (security, backport from 0.4.0.4-rc):
4837 - Verify in more places that we are not about to create a buffer
4838 with more than INT_MAX bytes, to avoid possible OOB access in the
4839 event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
4840 fixed by Tobias Stoeckmann.
4841 - Fix a potential double free bug when reading huge bandwidth files.
4842 The issue is not exploitable in the current Tor network because
4843 the vulnerable code is only reached when directory authorities
4844 read bandwidth files, but bandwidth files come from a trusted
4845 source (usually the authorities themselves). Furthermore, the
4846 issue is only exploitable in rare (non-POSIX) 32-bit architectures,
4847 which are not used by any of the current authorities. Fixes bug
4848 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
4851 o Minor bugfix (continuous integration, backport from 0.4.0.4-rc):
4852 - Reset coverage state on disk after Travis CI has finished. This
4853 should prevent future coverage merge errors from causing the test
4854 suite for the "process" subsystem to fail. The process subsystem
4855 was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
4857 - Terminate test-stem if it takes more than 9.5 minutes to run.
4858 (Travis terminates the job after 10 minutes of no output.)
4859 Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
4861 o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
4862 - Avoid spurious errors when Appveyor CI fails before the install step.
4863 Fixes bug 31884; bugfix on 0.3.4.2-alpha.
4865 o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
4866 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
4867 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
4869 o Minor bugfixes (C correctness, backport from 0.4.0.4-rc):
4870 - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
4871 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
4874 o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
4875 - Fix a logic error that prevented the SessionGroup sub-option from
4876 being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
4878 o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
4879 - Fix a BUG() assertion that occurs within a very small race window
4880 between when a client intro circuit opens and when its descriptor
4881 gets cleaned up from the cache. The circuit is now closed early,
4882 which will trigger a re-fetch of the descriptor and continue the
4883 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
4885 o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
4886 - Don't believe clock skew results from NETINFO cells that appear to
4887 arrive before we sent the VERSIONS cells they are responding to.
4888 Previously, we would accept them up to 3 minutes "in the past".
4889 Fixes bug 31343; bugfix on 0.2.4.4-alpha.
4891 o Minor bugfixes (compilation warning, backport from 0.4.1.5):
4892 - Fix a compilation warning on Windows about casting a function
4893 pointer for GetTickCount64(). Fixes bug 31374; bugfix
4896 o Minor bugfixes (compilation, backport from 0.4.0.2-alpha):
4897 - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
4898 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
4900 o Minor bugfixes (compilation, backport from 0.4.1.5):
4901 - Avoid using labs() on time_t, which can cause compilation warnings
4902 on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
4904 o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
4905 - Suppress spurious float-conversion warnings from GCC when calling
4906 floating-point classifier functions on FreeBSD. Fixes part of bug
4907 31687; bugfix on 0.3.1.5-alpha.
4909 o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
4910 - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
4911 due to missing declarations of abort(), and prevent other such
4912 failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
4914 o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
4915 - Fix a bug that prevented us from supporting SOCKS5 proxies that
4916 want authentication along with configured (but unused!)
4917 ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
4919 o Minor bugfixes (connections, backport from 0.4.2.3-rc):
4920 - Avoid trying to read data from closed connections, which can cause
4921 needless loops in Libevent and infinite loops in Shadow. Fixes bug
4922 30344; bugfix on 0.1.1.1-alpha.
4924 o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
4925 - Allow the test-stem job to fail in Travis, because it sometimes
4926 hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
4927 - Skip test_rebind on macOS in Travis, because it is unreliable on
4928 macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
4929 - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
4930 variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
4932 o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
4933 - Avoid a set of possible code paths that could try to use freed
4934 memory in routerlist_free() while Tor was exiting. Fixes bug
4935 31003; bugfix on 0.1.2.2-alpha.
4937 o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
4938 - Stop crashing after parsing an unknown descriptor purpose
4939 annotation. We think this bug can only be triggered by modifying a
4940 local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
4942 o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
4943 - Move the "bandwidth-file-headers" line in directory authority
4944 votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
4947 o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
4948 - On abort, try harder to flush the output buffers of log messages.
4949 On some platforms (macOS), log messages could be discarded when
4950 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
4951 - Report the tor version whenever an assertion fails. Previously, we
4952 only reported the Tor version on some crashes, and some non-fatal
4953 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
4955 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
4956 - When extracting an IPv6 address from a PF-based proxy, verify that
4957 we are actually configured to receive an IPv6 address, and log an
4958 internal error if not. Fixes part of bug 31687; bugfix
4961 o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
4962 - When tor is missing descriptors for some primary entry guards,
4963 make the log message less alarming. It's normal for descriptors to
4964 expire, as long as tor fetches new ones soon after. Fixes bug
4965 31657; bugfix on 0.3.3.1-alpha.
4967 o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
4968 - Avoid logging that we are relaxing a circuit timeout when that
4969 timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
4971 o Minor bugfixes (logging, backport from 0.4.0.3-alpha):
4972 - Correct a misleading error message when IPv4Only or IPv6Only is
4973 used but the resolved address can not be interpreted as an address
4974 of the specified IP version. Fixes bug 13221; bugfix on
4975 0.2.3.9-alpha. Patch from Kris Katterjohn.
4976 - Log the correct port number for listening sockets when "auto" is
4977 used to let Tor pick the port number. Previously, port 0 was
4978 logged instead of the actual port number. Fixes bug 29144; bugfix
4979 on 0.3.5.1-alpha. Patch from Kris Katterjohn.
4980 - Stop logging a BUG() warning when Tor is waiting for exit
4981 descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
4983 o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
4984 - Do not log a warning when running with an OpenSSL version other
4985 than the one Tor was compiled with, if the two versions should be
4986 compatible. Previously, we would warn whenever the version was
4987 different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
4989 o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
4990 - Change log level of message "Hash of session info was not as
4991 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
4994 o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
4995 - Rate-limit our the logging message about the obsolete .exit
4996 notation. Previously, there was no limit on this warning, which
4997 could potentially be triggered many times by a hostile website.
4998 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
5000 o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
5001 - Do not log a nonfatal assertion failure when receiving a VERSIONS
5002 cell on a connection using the obsolete v1 link protocol. Log a
5003 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
5005 o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
5006 - Reset the periodic events' "enabled" flag when Tor is shut down
5007 cleanly. Previously, this flag was left on, which caused periodic
5008 events not to be re-enabled when Tor was relaunched in-process
5009 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
5012 o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
5013 - Avoid a minor memory leak that could occur on relays when failing
5014 to create a "keys" directory. Fixes bug 30148; bugfix
5017 o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
5018 - Fix a trivial memory leak when parsing an invalid value
5019 from a download schedule in the configuration. Fixes bug
5020 30894; bugfix on 0.3.4.1-alpha.
5022 o Minor bugfixes (memory management, backport from 0.4.0.3-alpha):
5023 - Refactor the shared random state's memory management so that it
5024 actually takes ownership of the shared random value pointers.
5025 Fixes bug 29706; bugfix on 0.2.9.1-alpha.
5027 o Minor bugfixes (memory management, testing, backport from 0.4.0.3-alpha):
5028 - Stop leaking parts of the shared random state in the shared-random
5029 unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
5031 o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
5032 - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
5033 implemenation) when failing to load an onion service client
5034 authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
5036 o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
5037 - When purging the DNS cache because of an out-of-memory condition,
5038 try purging just the older entries at first. Previously, we would
5039 always purge the whole thing. Fixes bug 29617; bugfix
5042 o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
5043 - Avoid crashing in our tor_vasprintf() implementation on systems
5044 that define neither vasprintf() nor _vscprintf(). (This bug has
5045 been here long enough that we question whether people are running
5046 Tor on such systems, but we're applying the fix out of caution.)
5047 Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
5050 o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
5051 - Avoid crashing when starting with a corrupt keys directory where
5052 the old ntor key and the new ntor key are identical. Fixes bug
5053 30916; bugfix on 0.2.4.8-alpha.
5055 o Minor bugfixes (rust, backport from 0.4.0.5):
5056 - Abort on panic in all build profiles, instead of potentially
5057 unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
5059 o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
5060 - Correctly exclude a redundant rust build job in Travis. Fixes bug
5061 31463; bugfix on 0.3.5.4-alpha.
5063 o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha):
5064 - Allow connections to single onion services to remain idle without
5065 being disconnected. Previously, relays acting as rendezvous points
5066 for single onion services were mistakenly closing idle rendezvous
5067 circuits after 60 seconds, thinking that they were unused
5068 directory-fetching circuits that had served their purpose. Fixes
5069 bug 29665; bugfix on 0.2.1.26.
5071 o Minor bugfixes (stats, backport from 0.4.0.3-alpha):
5072 - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
5073 relay and bridge extra-info documents. Fixes bug 29017; bugfix
5076 o Minor bugfixes (testing, backport from 0.4.0.3-alpha):
5077 - Downgrade some LOG_ERR messages in the address/* tests to
5078 warnings. The LOG_ERR messages were occurring when we had no
5079 configured network. We were failing the unit tests, because we
5080 backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
5081 29530; bugfix on 0.3.5.8.
5082 - Fix our gcov wrapper script to look for object files at the
5083 correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
5085 o Minor bugfixes (testing, backport from 0.4.0.4-rc):
5086 - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
5087 recent test-network.sh to use new chutney features in CI. Fixes
5088 bug 29703; bugfix on 0.2.9.1-alpha.
5089 - Fix a test failure on Windows caused by an unexpected "BUG"
5090 warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
5093 o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
5094 - When testing port rebinding, don't busy-wait for tor to log.
5095 Instead, actually sleep for a short time before polling again.
5096 Also improve the formatting of control commands and log messages.
5097 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
5099 o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc):
5100 - When classifying a client's selection of TLS ciphers, if the
5101 client ciphers are not yet available, do not cache the result.
5102 Previously, we had cached the unavailability of the cipher list
5103 and never looked again, which in turn led us to assume that the
5104 client only supported the ancient V1 link protocol. This, in turn,
5105 was causing Stem integration tests to stall in some cases. Fixes
5106 bug 30021; bugfix on 0.2.4.8-alpha.
5108 o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
5109 - Log bugs about the TLS read buffer's length only once, rather than
5110 filling the logs with similar warnings. Fixes bug 31939; bugfix
5113 o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
5114 - Always retry v2 single onion service intro and rend circuits with
5115 a 3-hop path. Previously, v2 single onion services used a 3-hop
5116 path when rendezvous circuits were retried after a remote or
5117 delayed failure, but a 1-hop path for immediate retries. Fixes bug
5118 23818; bugfix on 0.2.9.3-alpha.
5119 - Make v3 single onion services fall back to a 3-hop intro, when all
5120 intro points are unreachable via a 1-hop path. Previously, v3
5121 single onion services failed when all intro nodes were unreachable
5122 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
5124 o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha):
5125 - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
5126 Windows Server 2012 R2 job. The remaining 2 jobs still provide
5127 coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
5128 fast_finish, so failed jobs terminate the build immediately. Fixes
5129 bug 29601; bugfix on 0.3.5.4-alpha.
5131 o Documentation (backport from 0.4.2.1-alpha):
5132 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
5133 notice.html so that operators no longer have to host it
5134 themselves. Closes ticket 31089.
5136 o Testing (backport from 0.4.1.2-alpha):
5137 - Specify torrc paths (with empty files) when launching tor in
5138 integration tests; refrain from reading user and system torrcs.
5139 Resolves issue 29702.
5141 o Testing (continuous integration, backport from 0.4.1.1-alpha):
5142 - In Travis, show stem's tor log after failure. Closes ticket 30234.
5144 o Testing (continuous integration, backport from 0.4.1.5):
5145 - In Travis, make stem log a controller trace to the console, and
5146 tail stem's tor log after failure. Closes ticket 30591.
5147 - In Travis, only run the stem tests that use a tor binary. Closes
5150 o Testing (continuous integration, backport from 0.4.2.3-alpha):
5151 - Disable all but one Travis CI macOS build, to mitigate slow
5152 scheduling of Travis macOS jobs. Closes ticket 32177.
5153 - Run the chutney IPv6 networks as part of Travis CI. Closes
5155 - Simplify the Travis CI build matrix, and optimise for build time.
5156 Closes ticket 31859.
5157 - Use Windows Server 2019 instead of Windows Server 2016 in our
5158 Appveyor builds. Closes ticket 32086.
5160 o Testing (continuous integration, backport from 0.4.2.4-rc):
5161 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
5162 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
5163 until we can fix some Bionic permissions issues (see ticket
5164 32240). Related to ticket 31919.
5165 - Install the mingw OpenSSL package in Appveyor. This makes sure
5166 that the OpenSSL headers and libraries match in Tor's Appveyor
5167 builds. (This bug was triggered by an Appveyor image update.)
5168 Fixes bug 32449; bugfix on 0.3.5.6-rc.
5169 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
5171 o Testing (continuous integration, backport from 0.4.2.5):
5172 - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
5173 extensions. Also activates clang's -Wtypedef-redefinition warnings.
5174 Build some jobs with -std=gnu99, and some jobs without.
5175 Closes ticket 32500.
5178 Changes in version 0.4.1.6 - 2019-09-19
5179 This release backports several bugfixes to improve stability and
5180 correctness. Anyone experiencing build problems or crashes with 0.4.1.5,
5181 or experiencing reliability issues with single onion services, should
5184 o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
5185 - Tolerate systems (including some Android installations) where
5186 madvise and MADV_DONTDUMP are available at build-time, but not at
5187 run time. Previously, these systems would notice a failed syscall
5188 and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
5189 - Tolerate systems (including some Linux installations) where
5190 madvise and/or MADV_DONTFORK are available at build-time, but not
5191 at run time. Previously, these systems would notice a failed
5192 syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
5194 o Minor features (stem tests, backport from 0.4.2.1-alpha):
5195 - Change "make test-stem" so it only runs the stem tests that use
5196 tor. This change makes test-stem faster and more reliable. Closes
5199 o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
5200 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
5201 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
5203 o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
5204 - Add more stub functions to fix compilation on Android with link-
5205 time optimization when --disable-module-dirauth is used.
5206 Previously, these compilation settings would make the compiler
5207 look for functions that didn't exist. Fixes bug 31552; bugfix
5209 - Suppress spurious float-conversion warnings from GCC when calling
5210 floating-point classifier functions on FreeBSD. Fixes part of bug
5211 31687; bugfix on 0.3.1.5-alpha.
5213 o Minor bugfixes (controller protocol):
5214 - Fix the MAPADDRESS controller command to accept one or more
5215 arguments. Previously, it required two or more arguments, and ignored
5216 the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
5218 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
5219 - When extracting an IPv6 address from a PF-based proxy, verify that
5220 we are actually configured to receive an IPv6 address, and log an
5221 internal error if not. Fixes part of bug 31687; bugfix
5224 o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
5225 - When tor is missing descriptors for some primary entry guards,
5226 make the log message less alarming. It's normal for descriptors to
5227 expire, as long as tor fetches new ones soon after. Fixes bug
5228 31657; bugfix on 0.3.3.1-alpha.
5230 o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
5231 - Change log level of message "Hash of session info was not as
5232 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
5235 o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
5236 - Correctly exclude a redundant rust build job in Travis. Fixes bug
5237 31463; bugfix on 0.3.5.4-alpha.
5239 o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
5240 - Always retry v2 single onion service intro and rend circuits with
5241 a 3-hop path. Previously, v2 single onion services used a 3-hop
5242 path when rendezvous circuits were retried after a remote or
5243 delayed failure, but a 1-hop path for immediate retries. Fixes bug
5244 23818; bugfix on 0.2.9.3-alpha.
5246 o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
5247 - Always retry v3 single onion service intro and rend circuits with
5248 a 3-hop path. Previously, v3 single onion services used a 3-hop
5249 path when rend circuits were retried after a remote or delayed
5250 failure, but a 1-hop path for immediate retries. Fixes bug 23818;
5251 bugfix on 0.3.2.1-alpha.
5252 - Make v3 single onion services fall back to a 3-hop intro, when all
5253 intro points are unreachable via a 1-hop path. Previously, v3
5254 single onion services failed when all intro nodes were unreachable
5255 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
5257 o Documentation (backport from 0.4.2.1-alpha):
5258 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
5259 notice.html so that operators no longer have to host it
5260 themselves. Closes ticket 31089.
5263 Changes in version 0.4.1.5 - 2019-08-20
5264 This is the first stable release in the 0.4.1.x series. This series
5265 adds experimental circuit-level padding, authenticated SENDME cells to
5266 defend against certain attacks, and several performance improvements
5267 to save on CPU consumption. It fixes bugs in bootstrapping and v3
5268 onion services. It also includes numerous smaller features and
5269 bugfixes on earlier versions.
5271 Per our support policy, we will support the 0.4.1.x series for nine
5272 months, or until three months after the release of a stable 0.4.2.x:
5273 whichever is longer. If you need longer-term support, please stick
5274 with 0.3.5.x, which will we plan to support until Feb 2022.
5276 Below are the changes since 0.4.0.5. For a list of only the changes
5277 since 0.4.1.4-rc, see the ChangeLog file.
5279 o Directory authority changes:
5280 - The directory authority "dizum" has a new IP address. Closes
5283 o Major features (circuit padding):
5284 - Onion service clients now add padding cells at the start of their
5285 INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic
5286 look more like general purpose Exit traffic. The overhead for this
5287 is 2 extra cells in each direction for RENDEZVOUS circuits, and 1
5288 extra upstream cell and 10 downstream cells for INTRODUCE
5289 circuits. This feature is only enabled when also supported by the
5290 circuit's middle node. (Clients may specify fixed middle nodes
5291 with the MiddleNodes option, and may force-disable this feature
5292 with the CircuitPadding option.) Closes ticket 28634.
5294 o Major features (code organization):
5295 - Tor now includes a generic publish-subscribe message-passing
5296 subsystem that we can use to organize intermodule dependencies. We
5297 hope to use this to reduce dependencies between modules that don't
5298 need to be related, and to generally simplify our codebase. Closes
5301 o Major features (controller protocol):
5302 - Controller commands are now parsed using a generalized parsing
5303 subsystem. Previously, each controller command was responsible for
5304 parsing its own input, which led to strange inconsistencies.
5305 Closes ticket 30091.
5307 o Major features (flow control):
5308 - Implement authenticated SENDMEs as detailed in proposal 289. A
5309 SENDME cell now includes the digest of the traffic that it
5310 acknowledges, so that once an end point receives the SENDME, it
5311 can confirm the other side's knowledge of the previous cells that
5312 were sent, and prevent certain types of denial-of-service attacks.
5313 This behavior is controlled by two new consensus parameters: see
5314 the proposal for more details. Fixes ticket 26288.
5316 o Major features (performance):
5317 - Our node selection algorithm now excludes nodes in linear time.
5318 Previously, the algorithm was quadratic, which could slow down
5319 heavily used onion services. Closes ticket 30307.
5321 o Major features (performance, RNG):
5322 - Tor now constructs a fast secure pseudorandom number generator for
5323 each thread, to use when performance is critical. This PRNG is
5324 based on AES-CTR, using a buffering construction similar to
5325 libottery and the (newer) OpenBSD arc4random() code. It
5326 outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for
5327 small outputs. Although we believe it to be cryptographically
5328 strong, we are only using it when necessary for performance.
5329 Implements tickets 29023 and 29536.
5331 o Major bugfixes (bridges):
5332 - Consider our directory information to have changed when our list
5333 of bridges changes. Previously, Tor would not re-compute the
5334 status of its directory information when bridges changed, and
5335 therefore would not realize that it was no longer able to build
5336 circuits. Fixes part of bug 29875.
5337 - Do not count previously configured working bridges towards our
5338 total of working bridges. Previously, when Tor's list of bridges
5339 changed, it would think that the old bridges were still usable,
5340 and delay fetching router descriptors for the new ones. Fixes part
5341 of bug 29875; bugfix on 0.3.0.1-alpha.
5343 o Major bugfixes (circuit build, guard):
5344 - On relays, properly check that a padding machine is absent before
5345 logging a warning about it being absent. Fixes bug 30649; bugfix
5347 - When considering upgrading circuits from "waiting for guard" to
5348 "open", always ignore circuits that are marked for close. Otherwise,
5349 we can end up in the situation where a subsystem is notified that
5350 a closing circuit has just opened, leading to undesirable
5351 behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
5353 o Major bugfixes (onion service reachability):
5354 - Properly clean up the introduction point map when circuits change
5355 purpose from onion service circuits to pathbias, measurement, or
5356 other circuit types. This should fix some service-side instances
5357 of introduction point failure. Fixes bug 29034; bugfix
5360 o Major bugfixes (onion service v3):
5361 - Fix an unreachable bug in which an introduction point could try to
5362 send an INTRODUCE_ACK with a status code that Trunnel would refuse
5363 to encode, leading the relay to assert(). We've consolidated the
5364 ABI values into Trunnel now. Fixes bug 30454; bugfix
5366 - Clients can now handle unknown status codes from INTRODUCE_ACK
5367 cells. (The NACK behavior will stay the same.) This will allow us
5368 to extend status codes in the future without breaking the normal
5369 client behavior. Fixes another part of bug 30454; bugfix
5372 o Minor features (authenticated SENDME):
5373 - Ensure that there is enough randomness on every circuit to prevent
5374 an attacker from successfully predicting the hashes they will need
5375 to include in authenticated SENDME cells. At a random interval, if
5376 we have not sent randomness already, we now leave some extra space
5377 at the end of a cell that we can fill with random bytes. Closes
5380 o Minor features (circuit padding logging):
5381 - Demote noisy client-side warn logs about circuit padding to protocol
5382 warnings. Add additional log messages and circuit ID fields to help
5383 with bug 30992 and any other future issues.
5385 o Minor features (circuit padding):
5386 - We now use a fast PRNG when scheduling circuit padding. Part of
5388 - Allow the padding machine designer to pick the edges of their
5389 histogram instead of trying to compute them automatically using an
5390 exponential formula. Resolves some undefined behavior in the case
5391 of small histograms and allows greater flexibility on machine
5392 design. Closes ticket 29298; bugfix on 0.4.0.1-alpha.
5393 - Allow circuit padding machines to hold a circuit open until they
5394 are done padding it. Closes ticket 28780.
5396 o Minor features (compile-time modules):
5397 - Add a "--list-modules" command to print a list of which compile-
5398 time modules are enabled. Closes ticket 30452.
5400 o Minor features (continuous integration):
5401 - Our Travis configuration now uses Chutney to run some network
5402 integration tests automatically. Closes ticket 29280.
5403 - When running coverage builds on Travis, we now set
5404 TOR_TEST_RNG_SEED, to avoid RNG-based coverage differences. Part
5406 - Remove sudo configuration lines from .travis.yml as they are no
5407 longer needed with current Travis build environment. Resolves
5409 - In Travis, show stem's tor log after failure. Closes ticket 30234.
5411 o Minor features (controller):
5412 - Add onion service version 3 support to the HSFETCH command.
5413 Previously, only version 2 onion services were supported. Closes
5414 ticket 25417. Patch by Neel Chauhan.
5416 o Minor features (debugging):
5417 - Introduce tor_assertf() and tor_assertf_nonfatal() to enable
5418 logging of additional information during assert failure. Now we
5419 can use format strings to include information for trouble
5420 shooting. Resolves ticket 29662.
5422 o Minor features (defense in depth):
5423 - In smartlist_remove_keeporder(), set unused pointers to NULL, in
5424 case a bug causes them to be used later. Closes ticket 30176.
5425 Patch from Tobias Stoeckmann.
5426 - Tor now uses a cryptographically strong PRNG even for decisions
5427 that we do not believe are security-sensitive. Previously, for
5428 performance reasons, we had used a trivially predictable linear
5429 congruential generator algorithm for certain load-balancing and
5430 statistical sampling decisions. Now we use our fast RNG in those
5431 cases. Closes ticket 29542.
5433 o Minor features (developer tools):
5434 - Tor's "practracker" test script now checks for files and functions
5435 that seem too long and complicated. Existing overlong functions
5436 and files are accepted for now, but should eventually be
5437 refactored. Closes ticket 29221.
5438 - Add some scripts used for git maintenance to scripts/git. Closes
5440 - Call practracker from pre-push and pre-commit git hooks to let
5441 developers know if they made any code style violations. Closes
5443 - Add a script to check that each header has a well-formed and
5444 unique guard macro. Closes ticket 29756.
5446 o Minor features (fallback directory list):
5447 - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
5448 in December 2018 (of which ~122 were still functional), with a
5449 list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
5450 in June 2019. Closes ticket 28795.
5452 o Minor features (geoip):
5453 - Update geoip and geoip6 to the June 10 2019 Maxmind GeoLite2
5454 Country database. Closes ticket 30852.
5455 - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
5456 Country database. Closes ticket 30522.
5458 o Minor features (HTTP tunnel):
5459 - Return an informative web page when the HTTPTunnelPort is used as
5460 an HTTP proxy. Closes ticket 27821, patch by "eighthave".
5462 o Minor features (IPv6, v3 onion services):
5463 - Make v3 onion services put IPv6 addresses in service descriptors.
5464 Before this change, service descriptors only contained IPv4
5465 addresses. Implements 26992.
5467 o Minor features (logging):
5468 - Give a more useful assertion failure message if we think we have
5469 minherit() but we fail to make a region non-inheritable. Give a
5470 compile-time warning if our support for minherit() is incomplete.
5471 Closes ticket 30686.
5473 o Minor features (maintenance):
5474 - Add a new "make autostyle" target that developers can use to apply
5475 all automatic Tor style and consistency conversions to the
5476 codebase. Closes ticket 30539.
5478 o Minor features (modularity):
5479 - The "--disable-module-dirauth" compile-time option now disables
5480 even more dirauth-only code. Closes ticket 30345.
5482 o Minor features (performance):
5483 - Use OpenSSL's implementations of SHA3 when available (in OpenSSL
5484 1.1.1 and later), since they tend to be faster than tiny-keccak.
5485 Closes ticket 28837.
5487 o Minor features (testing):
5488 - The circuitpadding tests now use a reproducible RNG implementation,
5489 so that if a test fails, we can learn why. Part of ticket 28878.
5490 - Tor's tests now support an environment variable, TOR_TEST_RNG_SEED,
5491 to set the RNG seed for tests that use a reproducible RNG. Part of
5493 - When running tests in coverage mode, take additional care to make
5494 our coverage deterministic, so that we can accurately track
5495 changes in code coverage. Closes ticket 30519.
5496 - Tor's unit test code now contains helper functions to replace the
5497 PRNG with a deterministic or reproducible version for testing.
5498 Previously, various tests implemented this in various ways.
5499 Implements ticket 29732.
5500 - We now have a script, cov-test-determinism.sh, to identify places
5501 where our unit test coverage has become nondeterministic. Closes
5503 - Check that representative subsets of values of `int` and `unsigned
5504 int` can be represented by `void *`. Resolves issue 29537.
5506 o Minor bugfixes (bridge authority):
5507 - Bridge authorities now set bridges as running or non-running when
5508 about to dump their status to a file. Previously, they set bridges
5509 as running in response to a GETINFO command, but those shouldn't
5510 modify data structures. Fixes bug 24490; bugfix on 0.2.0.13-alpha.
5511 Patch by Neel Chauhan.
5513 o Minor bugfixes (channel padding statistics):
5514 - Channel padding write totals and padding-enabled totals are now
5515 counted properly in relay extrainfo descriptors. Fixes bug 29231;
5516 bugfix on 0.3.1.1-alpha.
5518 o Minor bugfixes (circuit isolation):
5519 - Fix a logic error that prevented the SessionGroup sub-option from
5520 being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
5522 o Minor bugfixes (circuit padding):
5523 - Add a "CircuitPadding" torrc option to disable circuit padding.
5524 Fixes bug 28693; bugfix on 0.4.0.1-alpha.
5525 - Allow circuit padding machines to specify that they do not
5526 contribute much overhead, and provide consensus flags and torrc
5527 options to force clients to only use these low overhead machines.
5528 Fixes bug 29203; bugfix on 0.4.0.1-alpha.
5529 - Provide a consensus parameter to fully disable circuit padding, to
5530 be used in emergency network overload situations. Fixes bug 30173;
5531 bugfix on 0.4.0.1-alpha.
5532 - The circuit padding subsystem will no longer schedule padding if
5533 dormant mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha.
5534 - Inspect a circuit-level cell queue before sending padding, to
5535 avoid sending padding while too much data is already queued. Fixes
5536 bug 29204; bugfix on 0.4.0.1-alpha.
5537 - Avoid calling monotime_absolute_usec() in circuit padding machines
5538 that do not use token removal or circuit RTT estimation. Fixes bug
5539 29085; bugfix on 0.4.0.1-alpha.
5541 o Minor bugfixes (clock skew detection):
5542 - Don't believe clock skew results from NETINFO cells that appear to
5543 arrive before we sent the VERSIONS cells they are responding to.
5544 Previously, we would accept them up to 3 minutes "in the past".
5545 Fixes bug 31343; bugfix on 0.2.4.4-alpha.
5547 o Minor bugfixes (compatibility, standards compliance):
5548 - Fix a bug that would invoke undefined behavior on certain
5549 operating systems when trying to asprintf() a string exactly
5550 INT_MAX bytes long. We don't believe this is exploitable, but it's
5551 better to fix it anyway. Fixes bug 31001; bugfix on 0.2.2.11-alpha.
5552 Found and fixed by Tobias Stoeckmann.
5554 o Minor bugfixes (compilation warning):
5555 - Fix a compilation warning on Windows about casting a function
5556 pointer for GetTickCount64(). Fixes bug 31374; bugfix on
5559 o Minor bugfixes (compilation):
5560 - Avoid using labs() on time_t, which can cause compilation warnings
5561 on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
5563 o Minor bugfixes (compilation, unusual configurations):
5564 - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
5565 due to missing declarations of abort(), and prevent other such
5566 failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
5568 o Minor bugfixes (configuration, proxies):
5569 - Fix a bug that prevented us from supporting SOCKS5 proxies that
5570 want authentication along with configured (but unused!)
5571 ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
5573 o Minor bugfixes (continuous integration):
5574 - Allow the test-stem job to fail in Travis, because it sometimes
5575 hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
5576 - Skip test_rebind on macOS in Travis, because it is unreliable on
5577 macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
5578 - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
5579 variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
5581 o Minor bugfixes (controller protocol):
5582 - Teach the controller parser to distinguish an object preceded by
5583 an argument list from one without. Previously, it couldn't
5584 distinguish an argument list from the first line of a multiline
5585 object. Fixes bug 29984; bugfix on 0.2.3.8-alpha.
5587 o Minor bugfixes (crash on exit):
5588 - Avoid a set of possible code paths that could try to use freed
5589 memory in routerlist_free() while Tor was exiting. Fixes bug
5590 31003; bugfix on 0.1.2.2-alpha.
5592 o Minor bugfixes (developer tooling):
5593 - Fix pre-push hook to allow fixup and squash commits when pushing
5594 to non-upstream git remote. Fixes bug 30286; bugfix
5597 o Minor bugfixes (directory authorities):
5598 - Stop crashing after parsing an unknown descriptor purpose
5599 annotation. We think this bug can only be triggered by modifying a
5600 local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
5601 - Move the "bandwidth-file-headers" line in directory authority
5602 votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
5604 - Directory authorities with IPv6 support now always mark themselves
5605 as reachable via IPv6. Fixes bug 24338; bugfix on 0.2.4.1-alpha.
5606 Patch by Neel Chauhan.
5608 o Minor bugfixes (documentation):
5609 - Improve the documentation for using MapAddress with ".exit". Fixes
5610 bug 30109; bugfix on 0.1.0.1-rc.
5611 - Improve the monotonic time module and function documentation to
5612 explain what "monotonic" actually means, and document some results
5613 that have surprised people. Fixes bug 29640; bugfix
5615 - Use proper formatting when providing an example on quoting options
5616 that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc.
5618 o Minor bugfixes (logging):
5619 - Do not log a warning when running with an OpenSSL version other
5620 than the one Tor was compiled with, if the two versions should be
5621 compatible. Previously, we would warn whenever the version was
5622 different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
5623 - Warn operators when the MyFamily option is set but ContactInfo is
5624 missing, as the latter should be set too. Fixes bug 25110; bugfix
5627 o Minor bugfixes (memory leaks):
5628 - Avoid a minor memory leak that could occur on relays when failing
5629 to create a "keys" directory. Fixes bug 30148; bugfix
5631 - Fix a trivial memory leak when parsing an invalid value from a
5632 download schedule in the configuration. Fixes bug 30894; bugfix
5635 o Minor bugfixes (NetBSD):
5636 - Fix usage of minherit() on NetBSD and other platforms that define
5637 MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
5638 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
5640 o Minor bugfixes (onion services):
5641 - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
5642 implemenation) when failing to load an onion service client
5643 authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
5644 - When refusing to launch a controller's HSFETCH request because of
5645 rate-limiting, respond to the controller with a new response,
5646 "QUERY_RATE_LIMITED". Previously, we would log QUERY_NO_HSDIR for
5647 this case. Fixes bug 28269; bugfix on 0.3.1.1-alpha. Patch by
5649 - When relaunching a circuit to a rendezvous service, mark the
5650 circuit as needing high-uptime routers as appropriate. Fixes bug
5651 17357; bugfix on 0.1.0.1-rc. Patch by Neel Chauhan.
5652 - Stop ignoring IPv6 link specifiers sent to v3 onion services.
5653 (IPv6 support for v3 onion services is still incomplete: see
5654 ticket 23493 for details.) Fixes bug 23588; bugfix on
5655 0.3.2.1-alpha. Patch by Neel Chauhan.
5657 o Minor bugfixes (onion services, performance):
5658 - When building circuits to onion services, call tor_addr_parse()
5659 less often. Previously, we called tor_addr_parse() in
5660 circuit_is_acceptable() even if its output wasn't used. This
5661 change should improve performance when building circuits. Fixes
5662 bug 22210; bugfix on 0.2.8.12. Patch by Neel Chauhan.
5664 o Minor bugfixes (out-of-memory handler):
5665 - When purging the DNS cache because of an out-of-memory condition,
5666 try purging just the older entries at first. Previously, we would
5667 always purge the whole thing. Fixes bug 29617; bugfix
5670 o Minor bugfixes (performance):
5671 - When checking whether a node is a bridge, use a fast check to make
5672 sure that its identity is set. Previously, we used a constant-time
5673 check, which is not necessary in this case. Fixes bug 30308;
5674 bugfix on 0.3.5.1-alpha.
5676 o Minor bugfixes (pluggable transports):
5677 - Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as
5678 well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha.
5680 o Minor bugfixes (portability):
5681 - Avoid crashing in our tor_vasprintf() implementation on systems
5682 that define neither vasprintf() nor _vscprintf(). (This bug has
5683 been here long enough that we question whether people are running
5684 Tor on such systems, but we're applying the fix out of caution.)
5685 Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
5688 o Minor bugfixes (probability distributions):
5689 - Refactor and improve parts of the probability distribution code
5690 that made Coverity complain. Fixes bug 29805; bugfix
5693 o Minor bugfixes (python):
5694 - Stop assuming that /usr/bin/python3 exists. For scripts that work
5695 with python2, use /usr/bin/python. Otherwise, use /usr/bin/env
5696 python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha.
5698 o Minor bugfixes (relay):
5699 - When running as a relay, if IPv6Exit is set to 1 while ExitRelay
5700 is auto, act as if ExitRelay is 1. Previously, we would ignore
5701 IPv6Exit if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on
5702 0.3.5.1-alpha. Patch by Neel Chauhan.
5704 o Minor bugfixes (static analysis):
5705 - Fix several spurious Coverity warnings about the unit tests, to
5706 lower our chances of missing real warnings in the future. Fixes
5707 bug 30150; bugfix on 0.3.5.1-alpha and various other Tor versions.
5709 o Minor bugfixes (stats):
5710 - When ExtraInfoStatistics is 0, stop including bandwidth usage
5711 statistics, GeoIPFile hashes, ServerTransportPlugin lines, and
5712 bridge statistics by country in extra-info documents. Fixes bug
5713 29018; bugfix on 0.2.4.1-alpha.
5715 o Minor bugfixes (testing):
5716 - Call setrlimit() to disable core dumps in test_bt_cl.c. Previously
5717 we used `ulimit -c` in test_bt.sh, which violates POSIX shell
5718 compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha.
5719 - Fix some incorrect code in the v3 onion service unit tests. Fixes
5720 bug 29243; bugfix on 0.3.2.1-alpha.
5721 - In the "routerkeys/*" tests, check the return values of mkdir()
5722 for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha.
5723 Found by Coverity as CID 1444254.
5724 - Split test_utils_general() into several smaller test functions.
5725 This makes it easier to perform resource deallocation on assert
5726 failure, and fixes Coverity warnings CID 1444117 and CID 1444118.
5727 Fixes bug 29823; bugfix on 0.2.9.1-alpha.
5729 o Minor bugfixes (tor-resolve):
5730 - Fix a memory leak in tor-resolve that could happen if Tor gave it
5731 a malformed SOCKS response. (Memory leaks in tor-resolve don't
5732 actually matter, but it's good to fix them anyway.) Fixes bug
5733 30151; bugfix on 0.4.0.1-alpha.
5735 o Code simplification and refactoring:
5736 - Abstract out the low-level formatting of replies on the control
5737 port. Implements ticket 30007.
5738 - Add several assertions in an attempt to fix some Coverity
5739 warnings. Closes ticket 30149.
5740 - Introduce a connection_dir_buf_add() helper function that checks
5741 for compress_state of dir_connection_t and automatically writes a
5742 string to directory connection with or without compression.
5743 Resolves issue 28816.
5744 - Make the base32_decode() API return the number of bytes written,
5745 for consistency with base64_decode(). Closes ticket 28913.
5746 - Move most relay-only periodic events out of mainloop.c into the
5747 relay subsystem. Closes ticket 30414.
5748 - Refactor and encapsulate parts of the codebase that manipulate
5749 crypt_path_t objects. Resolves issue 30236.
5750 - Refactor several places in our code that Coverity incorrectly
5751 believed might have memory leaks. Closes ticket 30147.
5752 - Remove redundant return values in crypto_format, and the
5753 associated return value checks elsewhere in the code. Make the
5754 implementations in crypto_format consistent, and remove redundant
5755 code. Resolves ticket 29660.
5756 - Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that
5757 it is not a constant-time function. Closes ticket 30309.
5758 - Replace hs_desc_link_specifier_t with link_specifier_t, and remove
5759 all hs_desc_link_specifier_t-specific code. Fixes bug 22781;
5760 bugfix on 0.3.2.1-alpha.
5761 - Simplify v3 onion service link specifier handling code. Fixes bug
5762 23576; bugfix on 0.3.2.1-alpha.
5763 - Split crypto_digest.c into NSS code, OpenSSL code, and shared
5764 code. Resolves ticket 29108.
5765 - Split control.c into several submodules, in preparation for
5766 distributing its current responsibilities throughout the codebase.
5767 Closes ticket 29894.
5768 - Start to move responsibility for knowing about periodic events to
5769 the appropriate subsystems, so that the mainloop doesn't need to
5770 know all the periodic events in the rest of the codebase.
5771 Implements tickets 30293 and 30294.
5774 - Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md.
5775 Closes ticket 30630.
5776 - Document how to find git commits and tags for bug fixes in
5777 CodingStandards.md. Update some file documentation. Closes
5781 - Remove the linux-tor-prio.sh script from contrib/operator-tools
5782 directory. Resolves issue 29434.
5783 - Remove the obsolete OpenSUSE initscript. Resolves issue 30076.
5784 - Remove the obsolete script at contrib/dist/tor.sh.in. Resolves
5788 - Specify torrc paths (with empty files) when launching tor in
5789 integration tests; refrain from reading user and system torrcs.
5790 Resolves issue 29702.
5792 o Code simplification and refactoring (shell scripts):
5793 - Clean up many of our shell scripts to fix shellcheck warnings.
5794 These include autogen.sh (ticket 26069), test_keygen.sh (ticket
5795 29062), test_switch_id.sh (ticket 29065), test_rebind.sh (ticket
5796 29063), src/test/fuzz/minimize.sh (ticket 30079), test_rust.sh
5797 (ticket 29064), torify (ticket 29070), asciidoc-helper.sh (29926),
5798 fuzz_multi.sh (30077), fuzz_static_testcases.sh (ticket 29059),
5799 nagios-check-tor-authority-cert (ticket 29071),
5800 src/test/fuzz/fixup_filenames.sh (ticket 30078), test-network.sh
5801 (ticket 29060), test_key_expiration.sh (ticket 30002),
5802 zero_length_keys.sh (ticket 29068), and test_workqueue_*.sh
5805 o Testing (chutney):
5806 - In "make test-network-all", test IPv6-only v3 single onion
5807 services, using the chutney network single-onion-v23-ipv6-md.
5808 Closes ticket 27251.
5810 o Testing (continuous integration):
5811 - In Travis, make stem log a controller trace to the console, and tail
5812 stem's tor log after failure. Closes ticket 30591.
5813 - In Travis, only run the stem tests that use a tor binary.
5814 Closes ticket 30694.
5817 Changes in version 0.4.0.5 - 2019-05-02
5818 This is the first stable release in the 0.4.0.x series. It contains
5819 improvements for power management and bootstrap reporting, as well as
5820 preliminary backend support for circuit padding to prevent some kinds
5821 of traffic analysis. It also continues our work in refactoring Tor for
5822 long-term maintainability.
5824 Per our support policy, we will support the 0.4.0.x series for nine
5825 months, or until three months after the release of a stable 0.4.1.x:
5826 whichever is longer. If you need longer-term support, please stick
5827 with 0.3.5.x, which will we plan to support until Feb 2022.
5829 Below are the changes since 0.3.5.7. For a complete list of changes
5830 since 0.4.0.4-rc, see the ChangeLog file.
5832 o Major features (battery management, client, dormant mode):
5833 - When Tor is running as a client, and it is unused for a long time,
5834 it can now enter a "dormant" state. When Tor is dormant, it avoids
5835 network and CPU activity until it is reawoken either by a user
5836 request or by a controller command. For more information, see the
5837 configuration options starting with "Dormant". Implements tickets
5839 - The client's memory of whether it is "dormant", and how long it
5840 has spent idle, persists across invocations. Implements
5842 - There is a DormantOnFirstStartup option that integrators can use
5843 if they expect that in many cases, Tor will be installed but
5846 o Major features (bootstrap reporting):
5847 - When reporting bootstrap progress, report the first connection
5848 uniformly, regardless of whether it's a connection for building
5849 application circuits. This allows finer-grained reporting of early
5850 progress than previously possible, with the improvements of ticket
5851 27169. Closes tickets 27167 and 27103. Addresses ticket 27308.
5852 - When reporting bootstrap progress, treat connecting to a proxy or
5853 pluggable transport as separate from having successfully used that
5854 proxy or pluggable transport to connect to a relay. Closes tickets
5857 o Major features (circuit padding):
5858 - Implement preliminary support for the circuit padding portion of
5859 Proposal 254. The implementation supports Adaptive Padding (aka
5860 WTF-PAD) state machines for use between experimental clients and
5861 relays. Support is also provided for APE-style state machines that
5862 use probability distributions instead of histograms to specify
5863 inter-packet delay. At the moment, Tor does not provide any
5864 padding state machines that are used in normal operation: for now,
5865 this feature exists solely for experimentation. Closes
5868 o Major features (refactoring):
5869 - Tor now uses an explicit list of its own subsystems when
5870 initializing and shutting down. Previously, these systems were
5871 managed implicitly in various places throughout the codebase.
5872 (There may still be some subsystems using the old system.) Closes
5875 o Major bugfixes (cell scheduler, KIST, security):
5876 - Make KIST consider the outbuf length when computing what it can
5877 put in the outbuf. Previously, KIST acted as though the outbuf
5878 were empty, which could lead to the outbuf becoming too full. It
5879 is possible that an attacker could exploit this bug to cause a Tor
5880 client or relay to run out of memory and crash. Fixes bug 29168;
5881 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
5882 TROVE-2019-001 and CVE-2019-8955.
5884 o Major bugfixes (networking):
5885 - Gracefully handle empty username/password fields in SOCKS5
5886 username/password auth message and allow SOCKS5 handshake to
5887 continue. Previously, we had rejected these handshakes, breaking
5888 certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
5890 o Major bugfixes (NSS, relay):
5891 - When running with NSS, disable TLS 1.2 ciphersuites that use
5892 SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
5893 these ciphersuites don't work -- which caused relays to fail to
5894 handshake with one another when these ciphersuites were enabled.
5895 Fixes bug 29241; bugfix on 0.3.5.1-alpha.
5897 o Major bugfixes (windows, startup):
5898 - When reading a consensus file from disk, detect whether it was
5899 written in text mode, and re-read it in text mode if so. Always
5900 write consensus files in binary mode so that we can map them into
5901 memory later. Previously, we had written in text mode, which
5902 confused us when we tried to map the file on windows. Fixes bug
5903 28614; bugfix on 0.4.0.1-alpha.
5905 o Minor features (address selection):
5906 - Treat the subnet 100.64.0.0/10 as public for some purposes;
5907 private for others. This subnet is the RFC 6598 (Carrier Grade
5908 NAT) IP range, and is deployed by many ISPs as an alternative to
5909 RFC 1918 that does not break existing internal networks. Tor now
5910 blocks SOCKS and control ports on these addresses and warns users
5911 if client ports or ExtORPorts are listening on a RFC 6598 address.
5912 Closes ticket 28525. Patch by Neel Chauhan.
5914 o Minor features (bandwidth authority):
5915 - Make bandwidth authorities ignore relays that are reported in the
5916 bandwidth file with the flag "vote=0". This change allows us to
5917 report unmeasured relays for diagnostic reasons without including
5918 their bandwidth in the bandwidth authorities' vote. Closes
5920 - When a directory authority is using a bandwidth file to obtain the
5921 bandwidth values that will be included in the next vote, serve
5922 this bandwidth file at /tor/status-vote/next/bandwidth. Closes
5925 o Minor features (bootstrap reporting):
5926 - When reporting bootstrap progress, stop distinguishing between
5927 situations where only internal paths are available and situations
5928 where external paths are available. Previously, Tor would often
5929 erroneously report that it had only internal paths. Closes
5932 o Minor features (compilation):
5933 - Compile correctly when OpenSSL is built with engine support
5934 disabled, or with deprecated APIs disabled. Closes ticket 29026.
5935 Patches from "Mangix".
5937 o Minor features (continuous integration):
5938 - On Travis Rust builds, cleanup Rust registry and refrain from
5939 caching the "target/" directory to speed up builds. Resolves
5941 - Log Python version during each Travis CI job. Resolves
5943 - In Travis, tell timelimit to use stem's backtrace signals, and
5944 launch python directly from timelimit, so python receives the
5945 signals from timelimit, rather than make. Closes ticket 30117.
5947 o Minor features (controller):
5948 - Add a DROPOWNERSHIP command to undo the effects of TAKEOWNERSHIP.
5949 Implements ticket 28843.
5951 o Minor features (developer tooling):
5952 - Check that bugfix versions in changes files look like Tor versions
5953 from the versions spec. Warn when bugfixes claim to be on a future
5954 release. Closes ticket 27761.
5955 - Provide a git pre-commit hook that disallows committing if we have
5956 any failures in our code and changelog formatting checks. It is
5957 now available in scripts/maint/pre-commit.git-hook. Implements
5959 - Provide a git hook script to prevent "fixup!" and "squash!"
5960 commits from ending up in the master branch, as scripts/main/pre-
5961 push.git-hook. Closes ticket 27993.
5963 o Minor features (diagnostic):
5964 - Add more diagnostic log messages in an attempt to solve the issue
5965 of NUL bytes appearing in a microdescriptor cache. Related to
5968 o Minor features (directory authority):
5969 - When a directory authority is using a bandwidth file to obtain
5970 bandwidth values, include the digest of that file in the vote.
5971 Closes ticket 26698.
5972 - Directory authorities support a new consensus algorithm, under
5973 which the family lines in microdescriptors are encoded in a
5974 canonical form. This change makes family lines more compressible
5975 in transit, and on the client. Closes ticket 28266; implements
5978 o Minor features (directory authority, relay):
5979 - Authorities now vote on a "StaleDesc" flag to indicate that a
5980 relay's descriptor is so old that the relay should upload again
5981 soon. Relays treat this flag as a signal to upload a new
5982 descriptor. This flag will eventually let us remove the
5983 'published' date from routerstatus entries, and make our consensus
5984 diffs much smaller. Closes ticket 26770; implements proposal 293.
5986 o Minor features (dormant mode):
5987 - Add a DormantCanceledByStartup option to tell Tor that it should
5988 treat a startup event as cancelling any previous dormant state.
5989 Integrators should use this option with caution: it should only be
5990 used if Tor is being started because of something that the user
5991 did, and not if Tor is being automatically started in the
5992 background. Closes ticket 29357.
5994 o Minor features (fallback directory mirrors):
5995 - Update the fallback whitelist based on operator opt-ins and opt-
5996 outs. Closes ticket 24805, patch by Phoul.
5998 o Minor features (FreeBSD):
5999 - On FreeBSD-based systems, warn relay operators if the
6000 "net.inet.ip.random_id" sysctl (IP ID randomization) is disabled.
6001 Closes ticket 28518.
6003 o Minor features (geoip):
6004 - Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2
6005 Country database. Closes ticket 29992.
6007 o Minor features (HTTP standards compliance):
6008 - Stop sending the header "Content-type: application/octet-stream"
6009 along with transparently compressed documents: this confused
6010 browsers. Closes ticket 28100.
6012 o Minor features (IPv6):
6013 - We add an option ClientAutoIPv6ORPort, to make clients randomly
6014 prefer a node's IPv4 or IPv6 ORPort. The random preference is set
6015 every time a node is loaded from a new consensus or bridge config.
6016 We expect that this option will enable clients to bootstrap more
6017 quickly without having to determine whether they support IPv4,
6018 IPv6, or both. Closes ticket 27490. Patch by Neel Chauhan.
6019 - When using addrs_in_same_network_family(), avoid choosing circuit
6020 paths that pass through the same IPv6 subnet more than once.
6021 Previously, we only checked IPv4 subnets. Closes ticket 24393.
6022 Patch by Neel Chauhan.
6024 o Minor features (log messages):
6025 - Improve log message in v3 onion services that could print out
6026 negative revision counters. Closes ticket 27707. Patch
6029 o Minor features (memory usage):
6030 - Save memory by storing microdescriptor family lists with a more
6031 compact representation. Closes ticket 27359.
6032 - Tor clients now use mmap() to read consensus files from disk, so
6033 that they no longer need keep the full text of a consensus in
6034 memory when parsing it or applying a diff. Closes ticket 27244.
6036 o Minor features (NSS, diagnostic):
6037 - Try to log an error from NSS (if there is any) and a more useful
6038 description of our situation if we are using NSS and a call to
6039 SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
6041 o Minor features (parsing):
6042 - Directory authorities now validate that router descriptors and
6043 ExtraInfo documents are in a valid subset of UTF-8, and reject
6044 them if they are not. Closes ticket 27367.
6046 o Minor features (performance):
6047 - Cache the results of summarize_protocol_flags(), so that we don't
6048 have to parse the same protocol-versions string over and over.
6049 This should save us a huge number of malloc calls on startup, and
6050 may reduce memory fragmentation with some allocators. Closes
6052 - Remove a needless memset() call from get_token_arguments, thereby
6053 speeding up the tokenization of directory objects by about 20%.
6054 Closes ticket 28852.
6055 - Replace parse_short_policy() with a faster implementation, to
6056 improve microdescriptor parsing time. Closes ticket 28853.
6057 - Speed up directory parsing a little by avoiding use of the non-
6058 inlined strcmp_len() function. Closes ticket 28856.
6059 - Speed up microdescriptor parsing by about 30%, to help improve
6060 startup time. Closes ticket 28839.
6062 o Minor features (pluggable transports):
6063 - Add support for emitting STATUS updates to Tor's control port from
6064 a pluggable transport process. Closes ticket 28846.
6065 - Add support for logging to Tor's logging subsystem from a
6066 pluggable transport process. Closes ticket 28180.
6068 o Minor features (process management):
6069 - Add a new process API for handling child processes. This new API
6070 allows Tor to have bi-directional communication with child
6071 processes on both Unix and Windows. Closes ticket 28179.
6072 - Use the subsystem manager to initialize and shut down the process
6073 module. Closes ticket 28847.
6075 o Minor features (relay):
6076 - When listing relay families, list them in canonical form including
6077 the relay's own identity, and try to give a more useful set of
6078 warnings. Part of ticket 28266 and proposal 298.
6080 o Minor features (required protocols):
6081 - Before exiting because of a missing required protocol, Tor will
6082 now check the publication time of the consensus, and not exit
6083 unless the consensus is newer than the Tor program's own release
6084 date. Previously, Tor would not check the consensus publication
6085 time, and so might exit because of a missing protocol that might
6086 no longer be required in a current consensus. Implements proposal
6087 297; closes ticket 27735.
6089 o Minor features (testing):
6090 - Treat all unexpected ERR and BUG messages as test failures. Closes
6092 - Allow a HeartbeatPeriod of less than 30 minutes in testing Tor
6093 networks. Closes ticket 28840. Patch by Rob Jansen.
6094 - Use the approx_time() function when setting the "Expires" header
6095 in directory replies, to make them more testable. Needed for
6098 o Minor bugfixes (security):
6099 - Fix a potential double free bug when reading huge bandwidth files.
6100 The issue is not exploitable in the current Tor network because
6101 the vulnerable code is only reached when directory authorities
6102 read bandwidth files, but bandwidth files come from a trusted
6103 source (usually the authorities themselves). Furthermore, the
6104 issue is only exploitable in rare (non-POSIX) 32-bit architectures,
6105 which are not used by any of the current authorities. Fixes bug
6106 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
6108 - Verify in more places that we are not about to create a buffer
6109 with more than INT_MAX bytes, to avoid possible OOB access in the
6110 event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
6111 fixed by Tobias Stoeckmann.
6113 o Minor bugfix (continuous integration):
6114 - Reset coverage state on disk after Travis CI has finished. This
6115 should prevent future coverage merge errors from causing the test
6116 suite for the "process" subsystem to fail. The process subsystem
6117 was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
6119 - Terminate test-stem if it takes more than 9.5 minutes to run.
6120 (Travis terminates the job after 10 minutes of no output.)
6121 Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
6123 o Minor bugfixes (build, compatibility, rust):
6124 - Update Cargo.lock file to match the version made by the latest
6125 version of Rust, so that "make distcheck" will pass again. Fixes
6126 bug 29244; bugfix on 0.3.3.4-alpha.
6128 o Minor bugfixes (C correctness):
6129 - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
6130 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
6133 o Minor bugfixes (client, clock skew):
6134 - Bootstrap successfully even when Tor's clock is behind the clocks
6135 on the authorities. Fixes bug 28591; bugfix on 0.2.0.9-alpha.
6136 - Select guards even if the consensus has expired, as long as the
6137 consensus is still reasonably live. Fixes bug 24661; bugfix
6140 o Minor bugfixes (compilation):
6141 - Fix compilation warnings in test_circuitpadding.c. Fixes bug
6142 29169; bugfix on 0.4.0.1-alpha.
6143 - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
6144 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
6145 - Compile correctly on OpenBSD; previously, we were missing some
6146 headers required in order to detect it properly. Fixes bug 28938;
6147 bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
6149 o Minor bugfixes (directory clients):
6150 - Mark outdated dirservers when Tor only has a reasonably live
6151 consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
6153 o Minor bugfixes (directory mirrors):
6154 - Even when a directory mirror's clock is behind the clocks on the
6155 authorities, we now allow the mirror to serve "future"
6156 consensuses. Fixes bug 28654; bugfix on 0.3.0.1-alpha.
6158 o Minor bugfixes (DNS):
6159 - Gracefully handle an empty or absent resolve.conf file by falling
6160 back to using "localhost" as a DNS server (and hoping it works).
6161 Previously, we would just stop running as an exit. Fixes bug
6162 21900; bugfix on 0.2.1.10-alpha.
6164 o Minor bugfixes (documentation):
6165 - Describe the contents of the v3 onion service client authorization
6166 files correctly: They hold public keys, not private keys. Fixes
6167 bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
6169 o Minor bugfixes (guards):
6170 - In count_acceptable_nodes(), the minimum number is now one bridge
6171 or guard node, and two non-guard nodes for a circuit. Previously,
6172 we had added up the sum of all nodes with a descriptor, but that
6173 could cause us to build failing circuits when we had either too
6174 many bridges or not enough guard nodes. Fixes bug 25885; bugfix on
6175 0.2.3.1-alpha. Patch by Neel Chauhan.
6177 o Minor bugfixes (IPv6):
6178 - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
6179 IPv6 socket was bound using an address family of AF_INET instead
6180 of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
6183 o Minor bugfixes (linux seccomp sandbox):
6184 - Fix startup crash when experimental sandbox support is enabled.
6185 Fixes bug 29150; bugfix on 0.4.0.1-alpha. Patch by Peter Gerber.
6187 o Minor bugfixes (logging):
6188 - Correct a misleading error message when IPv4Only or IPv6Only is
6189 used but the resolved address can not be interpreted as an address
6190 of the specified IP version. Fixes bug 13221; bugfix on
6191 0.2.3.9-alpha. Patch from Kris Katterjohn.
6192 - Log the correct port number for listening sockets when "auto" is
6193 used to let Tor pick the port number. Previously, port 0 was
6194 logged instead of the actual port number. Fixes bug 29144; bugfix
6195 on 0.3.5.1-alpha. Patch from Kris Katterjohn.
6196 - Stop logging a BUG() warning when Tor is waiting for exit
6197 descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
6198 - Avoid logging that we are relaxing a circuit timeout when that
6199 timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
6200 - Log more information at "warning" level when unable to read a
6201 private key; log more information at "info" level when unable to
6202 read a public key. We had warnings here before, but they were lost
6203 during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
6204 - Rework rep_hist_log_link_protocol_counts() to iterate through all
6205 link protocol versions when logging incoming/outgoing connection
6206 counts. Tor no longer skips version 5, and we won't have to
6207 remember to update this function when new link protocol version is
6208 developed. Fixes bug 28920; bugfix on 0.2.6.10.
6210 o Minor bugfixes (memory management):
6211 - Refactor the shared random state's memory management so that it
6212 actually takes ownership of the shared random value pointers.
6213 Fixes bug 29706; bugfix on 0.2.9.1-alpha.
6214 - Stop leaking parts of the shared random state in the shared-random
6215 unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
6217 o Minor bugfixes (misc):
6218 - The amount of total available physical memory is now determined
6219 using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
6220 when it is defined and a 64-bit variant is not available. Fixes
6221 bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
6223 o Minor bugfixes (networking):
6224 - Introduce additional checks into tor_addr_parse() to reject
6225 certain incorrect inputs that previously were not detected. Fixes
6226 bug 23082; bugfix on 0.2.0.10-alpha.
6228 o Minor bugfixes (onion service v3, client):
6229 - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
6230 connection waiting for a descriptor that we actually have in the
6231 cache. It turns out that this can actually happen, though it is
6232 rare. Now, tor will recover and retry the descriptor. Fixes bug
6233 28669; bugfix on 0.3.2.4-alpha.
6235 o Minor bugfixes (onion services):
6236 - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
6237 than one private key for a hidden service. Fixes bug 29040; bugfix
6239 - In hs_cache_store_as_client() log an HSDesc we failed to parse at
6240 "debug" level. Tor used to log it as a warning, which caused very
6241 long log lines to appear for some users. Fixes bug 29135; bugfix
6243 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
6244 as a warning. Instead, log it as a protocol warning, because there
6245 is nothing that relay operators can do to fix it. Fixes bug 29029;
6246 bugfix on 0.2.5.7-rc.
6248 o Minor bugfixes (periodic events):
6249 - Refrain from calling routerlist_remove_old_routers() from
6250 check_descriptor_callback(). Instead, create a new hourly periodic
6251 event. Fixes bug 27929; bugfix on 0.2.8.1-alpha.
6253 o Minor bugfixes (pluggable transports):
6254 - Make sure that data is continously read from standard output and
6255 standard error pipes of a pluggable transport child-process, to
6256 avoid deadlocking when a pipe's buffer is full. Fixes bug 26360;
6257 bugfix on 0.2.3.6-alpha.
6259 o Minor bugfixes (rust):
6260 - Abort on panic in all build profiles, instead of potentially
6261 unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
6263 o Minor bugfixes (scheduler):
6264 - When re-adding channels to the pending list, check the correct
6265 channel's sched_heap_idx. This issue has had no effect in mainline
6266 Tor, but could have led to bugs down the road in improved versions
6267 of our circuit scheduling code. Fixes bug 29508; bugfix
6270 o Minor bugfixes (shellcheck):
6271 - Look for scripts in their correct locations during "make
6272 shellcheck". Previously we had looked in the wrong place during
6273 out-of-tree builds. Fixes bug 30263; bugfix on 0.4.0.1-alpha.
6275 o Minor bugfixes (single onion services):
6276 - Allow connections to single onion services to remain idle without
6277 being disconnected. Previously, relays acting as rendezvous points
6278 for single onion services were mistakenly closing idle rendezvous
6279 circuits after 60 seconds, thinking that they were unused
6280 directory-fetching circuits that had served their purpose. Fixes
6281 bug 29665; bugfix on 0.2.1.26.
6283 o Minor bugfixes (stats):
6284 - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
6285 relay and bridge extra-info documents. Fixes bug 29017; bugfix
6288 o Minor bugfixes (testing):
6289 - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
6290 recent test-network.sh to use new chutney features in CI. Fixes
6291 bug 29703; bugfix on 0.2.9.1-alpha.
6292 - Fix a test failure on Windows caused by an unexpected "BUG"
6293 warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
6295 - Downgrade some LOG_ERR messages in the address/* tests to
6296 warnings. The LOG_ERR messages were occurring when we had no
6297 configured network. We were failing the unit tests, because we
6298 backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
6299 29530; bugfix on 0.3.5.8.
6300 - Fix our gcov wrapper script to look for object files at the
6301 correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
6302 - Decrease the false positive rate of stochastic probability
6303 distribution tests. Fixes bug 29693; bugfix on 0.4.0.1-alpha.
6304 - Fix intermittent failures on an adaptive padding test. Fixes one
6305 case of bug 29122; bugfix on 0.4.0.1-alpha.
6306 - Disable an unstable circuit-padding test that was failing
6307 intermittently because of an ill-defined small histogram. Such
6308 histograms will be allowed again after 29298 is implemented. Fixes
6309 a second case of bug 29122; bugfix on 0.4.0.1-alpha.
6310 - Detect and suppress "bug" warnings from the util/time test on
6311 Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
6312 - Do not log an error-level message if we fail to find an IPv6
6313 network interface from the unit tests. Fixes bug 29160; bugfix
6315 - Instead of relying on hs_free_all() to clean up all onion service
6316 objects in test_build_descriptors(), we now deallocate them one by
6317 one. This lets Coverity know that we are not leaking memory there
6318 and fixes CID 1442277. Fixes bug 28989; bugfix on 0.3.5.1-alpha.
6319 - Check the time in the "Expires" header using approx_time(). Fixes
6320 bug 30001; bugfix on 0.4.0.4-rc.
6322 o Minor bugfixes (TLS protocol):
6323 - When classifying a client's selection of TLS ciphers, if the
6324 client ciphers are not yet available, do not cache the result.
6325 Previously, we had cached the unavailability of the cipher list
6326 and never looked again, which in turn led us to assume that the
6327 client only supported the ancient V1 link protocol. This, in turn,
6328 was causing Stem integration tests to stall in some cases. Fixes
6329 bug 30021; bugfix on 0.2.4.8-alpha.
6331 o Minor bugfixes (UI):
6332 - Lower log level of unlink() errors during bootstrap. Fixes bug
6333 29930; bugfix on 0.4.0.1-alpha.
6335 o Minor bugfixes (usability):
6336 - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
6337 Some users took this phrasing to mean that the mentioned guard was
6338 under their control or responsibility, which it is not. Fixes bug
6339 28895; bugfix on Tor 0.3.0.1-alpha.
6341 o Minor bugfixes (Windows, CI):
6342 - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
6343 Windows Server 2012 R2 job. The remaining 2 jobs still provide
6344 coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
6345 fast_finish, so failed jobs terminate the build immediately. Fixes
6346 bug 29601; bugfix on 0.3.5.4-alpha.
6348 o Code simplification and refactoring:
6349 - Introduce a connection_dir_buf_add() helper function that detects
6350 whether compression is in use, and adds a string accordingly.
6351 Resolves issue 28816.
6352 - Refactor handle_get_next_bandwidth() to use
6353 connection_dir_buf_add(). Implements ticket 29897.
6354 - Reimplement NETINFO cell parsing and generation to rely on
6355 trunnel-generated wire format handling code. Closes ticket 27325.
6356 - Remove unnecessary unsafe code from the Rust macro "cstr!". Closes
6358 - Rework SOCKS wire format handling to rely on trunnel-generated
6359 parsing/generation code. Resolves ticket 27620.
6360 - Split out bootstrap progress reporting from control.c into a
6361 separate file. Part of ticket 27402.
6362 - The .may_include files that we use to describe our directory-by-
6363 directory dependency structure now describe a noncircular
6364 dependency graph over the directories that they cover. Our
6365 checkIncludes.py tool now enforces this noncircularity. Closes
6369 - Clarify that Tor performs stream isolation among *Port listeners
6370 by default. Resolves issue 29121.
6371 - In the manpage entry describing MapAddress torrc setting, use
6372 example IP addresses from ranges specified for use in documentation
6373 by RFC 5737. Resolves issue 28623.
6374 - Mention that you cannot add a new onion service if Tor is already
6375 running with Sandbox enabled. Closes ticket 28560.
6376 - Improve ControlPort documentation. Mention that it accepts
6377 address:port pairs, and can be used multiple times. Closes
6379 - Document the exact output of "tor --version". Closes ticket 28889.
6382 - Remove the old check-tor script. Resolves issue 29072.
6383 - Stop responding to the 'GETINFO status/version/num-concurring' and
6384 'GETINFO status/version/num-versioning' control port commands, as
6385 those were deprecated back in 0.2.0.30. Also stop listing them in
6386 output of 'GETINFO info/names'. Resolves ticket 28757.
6387 - The scripts used to generate and maintain the list of fallback
6388 directories have been extracted into a new "fallback-scripts"
6389 repository. Closes ticket 27914.
6392 - Run shellcheck for scripts in the in scripts/ directory. Closes
6394 - Add unit tests for tokenize_string() and get_next_token()
6395 functions. Resolves ticket 27625.
6397 o Code simplification and refactoring (onion service v3):
6398 - Consolidate the authorized client descriptor cookie computation
6399 code from client and service into one function. Closes
6402 o Code simplification and refactoring (shell scripts):
6403 - Cleanup scan-build.sh to silence shellcheck warnings. Closes
6405 - Fix issues that shellcheck found in chutney-git-bisect.sh.
6406 Resolves ticket 28006.
6407 - Fix issues that shellcheck found in updateRustDependencies.sh.
6408 Resolves ticket 28012.
6409 - Fix shellcheck warnings in cov-diff script. Resolves issue 28009.
6410 - Fix shellcheck warnings in run_calltool.sh. Resolves ticket 28011.
6411 - Fix shellcheck warnings in run_trunnel.sh. Resolves issue 28010.
6412 - Fix shellcheck warnings in scripts/test/coverage. Resolves
6416 Changes in version 0.3.5.8 - 2019-02-21
6417 Tor 0.3.5.8 backports several fixes from later releases, including fixes
6418 for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x
6421 It also includes a fix for a medium-severity security bug affecting Tor
6422 0.3.2.1-alpha and later. All Tor instances running an affected release
6423 should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
6425 o Major bugfixes (cell scheduler, KIST, security):
6426 - Make KIST consider the outbuf length when computing what it can
6427 put in the outbuf. Previously, KIST acted as though the outbuf
6428 were empty, which could lead to the outbuf becoming too full. It
6429 is possible that an attacker could exploit this bug to cause a Tor
6430 client or relay to run out of memory and crash. Fixes bug 29168;
6431 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
6432 TROVE-2019-001 and CVE-2019-8955.
6434 o Major bugfixes (networking, backport from 0.4.0.2-alpha):
6435 - Gracefully handle empty username/password fields in SOCKS5
6436 username/password auth messsage and allow SOCKS5 handshake to
6437 continue. Previously, we had rejected these handshakes, breaking
6438 certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
6440 o Minor features (compilation, backport from 0.4.0.2-alpha):
6441 - Compile correctly when OpenSSL is built with engine support
6442 disabled, or with deprecated APIs disabled. Closes ticket 29026.
6443 Patches from "Mangix".
6445 o Minor features (geoip):
6446 - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
6447 Country database. Closes ticket 29478.
6449 o Minor features (testing, backport from 0.4.0.2-alpha):
6450 - Treat all unexpected ERR and BUG messages as test failures. Closes
6453 o Minor bugfixes (onion service v3, client, backport from 0.4.0.1-alpha):
6454 - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
6455 connection waiting for a descriptor that we actually have in the
6456 cache. It turns out that this can actually happen, though it is
6457 rare. Now, tor will recover and retry the descriptor. Fixes bug
6458 28669; bugfix on 0.3.2.4-alpha.
6460 o Minor bugfixes (IPv6, backport from 0.4.0.1-alpha):
6461 - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
6462 IPv6 socket was bound using an address family of AF_INET instead
6463 of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
6466 o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
6467 - Update Cargo.lock file to match the version made by the latest
6468 version of Rust, so that "make distcheck" will pass again. Fixes
6469 bug 29244; bugfix on 0.3.3.4-alpha.
6471 o Minor bugfixes (client, clock skew, backport from 0.4.0.1-alpha):
6472 - Select guards even if the consensus has expired, as long as the
6473 consensus is still reasonably live. Fixes bug 24661; bugfix
6476 o Minor bugfixes (compilation, backport from 0.4.0.1-alpha):
6477 - Compile correctly on OpenBSD; previously, we were missing some
6478 headers required in order to detect it properly. Fixes bug 28938;
6479 bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
6481 o Minor bugfixes (documentation, backport from 0.4.0.2-alpha):
6482 - Describe the contents of the v3 onion service client authorization
6483 files correctly: They hold public keys, not private keys. Fixes
6484 bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
6486 o Minor bugfixes (logging, backport from 0.4.0.1-alpha):
6487 - Rework rep_hist_log_link_protocol_counts() to iterate through all
6488 link protocol versions when logging incoming/outgoing connection
6489 counts. Tor no longer skips version 5, and we won't have to
6490 remember to update this function when new link protocol version is
6491 developed. Fixes bug 28920; bugfix on 0.2.6.10.
6493 o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
6494 - Log more information at "warning" level when unable to read a
6495 private key; log more information at "info" level when unable to
6496 read a public key. We had warnings here before, but they were lost
6497 during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
6499 o Minor bugfixes (misc, backport from 0.4.0.2-alpha):
6500 - The amount of total available physical memory is now determined
6501 using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
6502 when it is defined and a 64-bit variant is not available. Fixes
6503 bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
6505 o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
6506 - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
6507 than one private key for a hidden service. Fixes bug 29040; bugfix
6509 - In hs_cache_store_as_client() log an HSDesc we failed to parse at
6510 "debug" level. Tor used to log it as a warning, which caused very
6511 long log lines to appear for some users. Fixes bug 29135; bugfix
6513 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
6514 as a warning. Instead, log it as a protocol warning, because there
6515 is nothing that relay operators can do to fix it. Fixes bug 29029;
6516 bugfix on 0.2.5.7-rc.
6518 o Minor bugfixes (tests, directory clients, backport from 0.4.0.1-alpha):
6519 - Mark outdated dirservers when Tor only has a reasonably live
6520 consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
6522 o Minor bugfixes (tests, backport from 0.4.0.2-alpha):
6523 - Detect and suppress "bug" warnings from the util/time test on
6524 Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
6525 - Do not log an error-level message if we fail to find an IPv6
6526 network interface from the unit tests. Fixes bug 29160; bugfix
6529 o Minor bugfixes (usability, backport from 0.4.0.1-alpha):
6530 - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
6531 Some users took this phrasing to mean that the mentioned guard was
6532 under their control or responsibility, which it is not. Fixes bug
6533 28895; bugfix on Tor 0.3.0.1-alpha.
6536 Changes in version 0.3.4.11 - 2019-02-21
6537 Tor 0.3.4.11 is the third stable release in its series. It includes
6538 a fix for a medium-severity security bug affecting Tor 0.3.2.1-alpha and
6539 later. All Tor instances running an affected release should upgrade to
6540 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
6542 o Major bugfixes (cell scheduler, KIST, security):
6543 - Make KIST consider the outbuf length when computing what it can
6544 put in the outbuf. Previously, KIST acted as though the outbuf
6545 were empty, which could lead to the outbuf becoming too full. It
6546 is possible that an attacker could exploit this bug to cause a Tor
6547 client or relay to run out of memory and crash. Fixes bug 29168;
6548 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
6549 TROVE-2019-001 and CVE-2019-8955.
6551 o Minor features (geoip):
6552 - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
6553 Country database. Closes ticket 29478.
6555 o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
6556 - Update Cargo.lock file to match the version made by the latest
6557 version of Rust, so that "make distcheck" will pass again. Fixes
6558 bug 29244; bugfix on 0.3.3.4-alpha.
6560 o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
6561 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
6562 as a warning. Instead, log it as a protocol warning, because there
6563 is nothing that relay operators can do to fix it. Fixes bug 29029;
6564 bugfix on 0.2.5.7-rc.
6567 Changes in version 0.3.3.12 - 2019-02-21
6568 Tor 0.3.3.12 fixes a medium-severity security bug affecting Tor
6569 0.3.2.1-alpha and later. All Tor instances running an affected release
6570 should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
6572 This release marks the end of support for the Tor 0.3.3.x series. We
6573 recommend that users switch to either the Tor 0.3.4 series (supported
6574 until at least 10 June 2019), or the Tor 0.3.5 series, which will
6575 receive long-term support until at least 1 Feb 2022.
6577 o Major bugfixes (cell scheduler, KIST, security):
6578 - Make KIST consider the outbuf length when computing what it can
6579 put in the outbuf. Previously, KIST acted as though the outbuf
6580 were empty, which could lead to the outbuf becoming too full. It
6581 is possible that an attacker could exploit this bug to cause a Tor
6582 client or relay to run out of memory and crash. Fixes bug 29168;
6583 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
6584 TROVE-2019-001 and CVE-2019-8955.
6586 o Minor features (geoip):
6587 - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
6588 Country database. Closes ticket 29478.
6590 o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
6591 - Update Cargo.lock file to match the version made by the latest
6592 version of Rust, so that "make distcheck" will pass again. Fixes
6593 bug 29244; bugfix on 0.3.3.4-alpha.
6595 o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
6596 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
6597 as a warning. Instead, log it as a protocol warning, because there
6598 is nothing that relay operators can do to fix it. Fixes bug 29029;
6599 bugfix on 0.2.5.7-rc.
6602 Changes in version 0.3.3.11 - 2019-01-07
6603 Tor 0.3.3.11 backports numerous fixes from later versions of Tor.
6604 numerous fixes, including an important fix for anyone using OpenSSL
6605 1.1.1. Anyone running an earlier version of Tor 0.3.3 should upgrade
6606 to this version, or to a later series.
6608 As a reminder, support the Tor 0.3.3 series will end on 22 Feb 2019.
6609 We anticipate that this will be the last release of Tor 0.3.3, unless
6610 some major bug is before then. Some time between now and then, users
6611 should switch to either the Tor 0.3.4 series (supported until at least
6612 10 June 2019), or the Tor 0.3.5 series, which will receive long-term
6613 support until at least 1 Feb 2022.
6615 o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
6616 - Fix our usage of named groups when running as a TLS 1.3 client in
6617 OpenSSL 1.1.1. Previously, we only initialized EC groups when
6618 running as a relay, which caused clients to fail to negotiate TLS
6619 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
6622 o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
6623 - Fix a use-after-free error that could be caused by passing Tor an
6624 impossible set of options that would fail during options_act().
6625 Fixes bug 27708; bugfix on 0.3.3.1-alpha.
6627 o Minor features (continuous integration, backport from 0.3.5.1-alpha):
6628 - Only run one online rust build in Travis, to reduce network
6629 errors. Skip offline rust builds on Travis for Linux gcc, because
6630 they're redundant. Implements ticket 27252.
6631 - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
6632 duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
6633 Linux with default settings, because all the non-default builds
6634 use gcc on Linux. Implements ticket 27252.
6636 o Minor features (continuous integration, backport from 0.3.5.3-alpha):
6637 - Use the Travis Homebrew addon to install packages on macOS during
6638 Travis CI. The package list is the same, but the Homebrew addon
6639 does not do a `brew update` by default. Implements ticket 27738.
6641 o Minor features (fallback directory list, backport from 0.3.5.6-rc):
6642 - Replace the 150 fallbacks originally introduced in Tor
6643 0.3.3.1-alpha in January 2018 (of which ~115 were still
6644 functional), with a list of 157 fallbacks (92 new, 65 existing, 85
6645 removed) generated in December 2018. Closes ticket 24803.
6647 o Minor features (geoip):
6648 - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
6649 Country database. Closes ticket 29012.
6651 o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
6652 - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
6653 key export function from handling long labels. When this bug is
6654 detected, Tor will disable TLS 1.3. We recommend upgrading to a
6655 version of OpenSSL without this bug when it becomes available.
6656 Closes ticket 28973.
6658 o Minor bugfixes (relay statistics, backport from 0.3.5.7):
6659 - Update relay descriptor on bandwidth changes only when the uptime
6660 is smaller than 24h, in order to reduce the efficiency of guard
6661 discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
6663 o Minor bugfixes (C correctness, backport from 0.3.5.4-alpha):
6664 - Avoid undefined behavior in an end-of-string check when parsing
6665 the BEGIN line in a directory object. Fixes bug 28202; bugfix
6668 o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
6669 - Rewrite our assertion macros so that they no longer suppress the
6670 compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
6672 o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
6673 - Initialize a variable unconditionally in aes_new_cipher(), since
6674 some compilers cannot tell that we always initialize it before
6675 use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
6677 o Minor bugfixes (directory authority, backport from 0.3.5.4-alpha):
6678 - Log additional info when we get a relay that shares an ed25519 ID
6679 with a different relay, instead making a BUG() warning. Fixes bug
6680 27800; bugfix on 0.3.2.1-alpha.
6682 o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
6683 - When a user requests a group-readable DataDirectory, give it to
6684 them. Previously, when the DataDirectory and the CacheDirectory
6685 were the same, the default setting (0) for
6686 CacheDirectoryGroupReadable would override the setting for
6687 DataDirectoryGroupReadable. Fixes bug 26913; bugfix
6690 o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
6691 - When the onion service directory can't be created or has the wrong
6692 permissions, do not log a stack trace. Fixes bug 27335; bugfix
6695 o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
6696 - Close all SOCKS request (for the same .onion) if the newly fetched
6697 descriptor is unusable. Before that, we would close only the first
6698 one leaving the other hanging and let to time out by themselves.
6699 Fixes bug 27410; bugfix on 0.3.2.1-alpha.
6701 o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
6702 - Don't warn so loudly when Tor is unable to decode an onion
6703 descriptor. This can now happen as a normal use case if a client
6704 gets a descriptor with client authorization but the client is not
6705 authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
6707 o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
6708 - When deleting an ephemeral onion service (DEL_ONION), do not close
6709 any rendezvous circuits in order to let the existing client
6710 connections finish by themselves or closed by the application. The
6711 HS v2 is doing that already so now we have the same behavior for
6712 all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
6714 o Minor bugfixes (HTTP tunnel):
6715 - Fix a bug warning when closing an HTTP tunnel connection due to
6716 an HTTP request we couldn't handle. Fixes bug 26470; bugfix on
6719 o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
6720 - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
6721 bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
6723 o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
6724 - Ensure circuitmux queues are empty before scheduling or sending
6725 padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
6727 o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
6728 - Reject protocol names containing bytes other than alphanumeric
6729 characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
6732 o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
6733 - Compute protover votes correctly in the rust version of the
6734 protover code. Previously, the protover rewrite in 24031 allowed
6735 repeated votes from the same voter for the same protocol version
6736 to be counted multiple times in protover_compute_vote(). Fixes bug
6737 27649; bugfix on 0.3.3.5-rc.
6738 - Reject protover names that contain invalid characters. Fixes bug
6739 27687; bugfix on 0.3.3.1-alpha.
6741 o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
6742 - protover_all_supported() would attempt to allocate up to 16GB on
6743 some inputs, leading to a potential memory DoS. Fixes bug 27206;
6744 bugfix on 0.3.3.5-rc.
6746 o Minor bugfixes (rust, backport from 0.3.5.4-alpha):
6747 - Fix a potential null dereference in protover_all_supported(). Add
6748 a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
6749 - Return a string that can be safely freed by C code, not one
6750 created by the rust allocator, in protover_all_supported(). Fixes
6751 bug 27740; bugfix on 0.3.3.1-alpha.
6752 - Fix an API mismatch in the rust implementation of
6753 protover_compute_vote(). This bug could have caused crashes on any
6754 directory authorities running Tor with Rust (which we do not yet
6755 recommend). Fixes bug 27741; bugfix on 0.3.3.6.
6757 o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
6758 - If a unit test running in a subprocess exits abnormally or with a
6759 nonzero status code, treat the test as having failed, even if the
6760 test reported success. Without this fix, memory leaks don't cause
6761 the tests to fail, even with LeakSanitizer. Fixes bug 27658;
6762 bugfix on 0.2.2.4-alpha.
6764 o Minor bugfixes (testing, backport from 0.3.5.4-alpha):
6765 - Treat backtrace test failures as expected on BSD-derived systems
6766 (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
6767 (FreeBSD failures have been treated as expected since 18204 in
6768 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
6770 o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
6771 - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
6772 bugfix on 0.3.0.1-alpha.
6775 Changes in version 0.3.4.10 - 2019-01-07
6776 Tor 0.3.4.9 is the second stable release in its series; it backports
6777 numerous fixes, including an important fix for relays, and for anyone
6778 using OpenSSL 1.1.1. Anyone running an earlier version of Tor 0.3.4
6781 As a reminder, the Tor 0.3.4 series will be supported until 10 June
6782 2019. Some time between now and then, users should switch to the Tor
6783 0.3.5 series, which will receive long-term support until at least 1
6786 o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
6787 - Fix our usage of named groups when running as a TLS 1.3 client in
6788 OpenSSL 1.1.1. Previously, we only initialized EC groups when
6789 running as a relay, which caused clients to fail to negotiate TLS
6790 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
6793 o Major bugfixes (relay, directory, backport from 0.3.5.7):
6794 - Always reactivate linked connections in the main loop so long as
6795 any linked connection has been active. Previously, connections
6796 serving directory information wouldn't get reactivated after the
6797 first chunk of data was sent (usually 32KB), which would prevent
6798 clients from bootstrapping. Fixes bug 28912; bugfix on
6799 0.3.4.1-alpha. Patch by "cypherpunks3".
6801 o Minor features (continuous integration, Windows, backport from 0.3.5.6-rc):
6802 - Always show the configure and test logs, and upload them as build
6803 artifacts, when building for Windows using Appveyor CI.
6806 o Minor features (controller, backport from 0.3.5.1-alpha):
6807 - For purposes of CIRC_BW-based dropped cell detection, track half-
6808 closed stream ids, and allow their ENDs, SENDMEs, DATA and path
6809 bias check cells to arrive without counting it as dropped until
6810 either the END arrives, or the windows are empty. Closes
6813 o Minor features (fallback directory list, backport from 0.3.5.6-rc):
6814 - Replace the 150 fallbacks originally introduced in Tor
6815 0.3.3.1-alpha in January 2018 (of which ~115 were still
6816 functional), with a list of 157 fallbacks (92 new, 65 existing, 85
6817 removed) generated in December 2018. Closes ticket 24803.
6819 o Minor features (geoip):
6820 - Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2
6821 Country database. Closes ticket 28395.
6823 o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
6824 - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
6825 key export function from handling long labels. When this bug is
6826 detected, Tor will disable TLS 1.3. We recommend upgrading to a
6827 version of OpenSSL without this bug when it becomes available.
6828 Closes ticket 28973.
6830 o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
6831 - Initialize a variable unconditionally in aes_new_cipher(), since
6832 some compilers cannot tell that we always initialize it before
6833 use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
6835 o Minor bugfixes (connection, relay, backport from 0.3.5.5-alpha):
6836 - Avoid a logging a BUG() stacktrace when closing connection held
6837 open because the write side is rate limited but not the read side.
6838 Now, the connection read side is simply shut down until Tor is
6839 able to flush the connection and close it. Fixes bug 27750; bugfix
6842 o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.5-alpha):
6843 - Manually configure the zstd compiler options, when building using
6844 mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
6845 not come with a pkg-config file. Fixes bug 28454; bugfix
6847 - Stop using an external OpenSSL install, and stop installing MSYS2
6848 packages, when building using mingw on Appveyor Windows CI. Fixes
6849 bug 28399; bugfix on 0.3.4.1-alpha.
6851 o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.6-rc):
6852 - Explicitly specify the path to the OpenSSL library and do not
6853 download OpenSSL from Pacman, but instead use the library that is
6854 already provided by AppVeyor. Fixes bug 28574; bugfix on master.
6856 o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
6857 - When a user requests a group-readable DataDirectory, give it to
6858 them. Previously, when the DataDirectory and the CacheDirectory
6859 were the same, the default setting (0) for
6860 CacheDirectoryGroupReadable would override the setting for
6861 DataDirectoryGroupReadable. Fixes bug 26913; bugfix
6864 o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
6865 - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
6866 bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
6868 o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
6869 - Don't warn so loudly when Tor is unable to decode an onion
6870 descriptor. This can now happen as a normal use case if a client
6871 gets a descriptor with client authorization but the client is not
6872 authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
6874 o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
6875 - When deleting an ephemeral onion service (DEL_ONION), do not close
6876 any rendezvous circuits in order to let the existing client
6877 connections finish by themselves or closed by the application. The
6878 HS v2 is doing that already so now we have the same behavior for
6879 all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
6881 o Minor bugfixes (relay statistics, backport from 0.3.5.7):
6882 - Update relay descriptor on bandwidth changes only when the uptime
6883 is smaller than 24h, in order to reduce the efficiency of guard
6884 discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
6886 o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
6887 - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
6888 bugfix on 0.3.0.1-alpha.
6891 Changes in version 0.3.5.7 - 2019-01-07
6892 Tor 0.3.5.7 is the first stable release in its series; it includes
6893 compilation and portability fixes, and a fix for a severe problem
6894 affecting directory caches.
6896 The Tor 0.3.5 series includes several new features and performance
6897 improvements, including client authorization for v3 onion services,
6898 cleanups to bootstrap reporting, support for improved bandwidth-
6899 measurement tools, experimental support for NSS in place of OpenSSL,
6900 and much more. It also begins a full reorganization of Tor's code
6901 layout, for improved modularity and maintainability in the future.
6902 Finally, there is the usual set of performance improvements and
6903 bugfixes that we try to do in every release series.
6905 There are a couple of changes in the 0.3.5 that may affect
6906 compatibility. First, the default version for newly created onion
6907 services is now v3. Use the HiddenServiceVersion option if you want to
6908 override this. Second, some log messages related to bootstrapping have
6909 changed; if you use stem, you may need to update to the latest version
6910 so it will recognize them.
6912 We have designated 0.3.5 as a "long-term support" (LTS) series: we
6913 will continue to patch major bugs in typical configurations of 0.3.5
6914 until at least 1 Feb 2022. (We do not plan to provide long-term
6915 support for embedding, Rust support, NSS support, running a directory
6916 authority, or unsupported platforms. For these, you will need to stick
6917 with the latest stable release.)
6919 Below are the changes since 0.3.4.9. For a complete list of changes
6920 since 0.3.5.6-rc, see the ChangeLog file.
6922 o Major features (bootstrap):
6923 - Don't report directory progress until after a connection to a
6924 relay or bridge has succeeded. Previously, we'd report 80%
6925 progress based on cached directory information when we couldn't
6926 even connect to the network. Closes ticket 27169.
6928 o Major features (new code layout):
6929 - Nearly all of Tor's source code has been moved around into more
6930 logical places. The "common" directory is now divided into a set
6931 of libraries in "lib", and files in the "or" directory have been
6932 split into "core" (logic absolutely needed for onion routing),
6933 "feature" (independent modules in Tor), and "app" (to configure
6934 and invoke the rest of Tor). See doc/HACKING/CodeStructure.md for
6935 more information. Closes ticket 26481.
6937 This refactoring is not complete: although the libraries have been
6938 refactored to be acyclic, the main body of Tor is still too
6939 interconnected. We will attempt to improve this in the future.
6941 o Major features (onion services v3):
6942 - Implement onion service client authorization at the descriptor
6943 level: only authorized clients can decrypt a service's descriptor
6944 to find out how to contact it. A new torrc option was added to
6945 control this client side: ClientOnionAuthDir <path>. On the
6946 service side, if the "authorized_clients/" directory exists in the
6947 onion service directory path, client configurations are read from
6948 the files within. See the manpage for more details. Closes ticket
6949 27547. Patch done by Suphanat Chunhapanya (haxxpop).
6950 - Improve revision counter generation in next-gen onion services.
6951 Onion services can now scale by hosting multiple instances on
6952 different hosts without synchronization between them, which was
6953 previously impossible because descriptors would get rejected by
6954 HSDirs. Addresses ticket 25552.
6955 - Version 3 onion services can now use the per-service
6956 HiddenServiceExportCircuitID option to differentiate client
6957 circuits. It communicates with the service by using the HAProxy
6958 protocol to assign virtual IP addresses to inbound client
6959 circuits. Closes ticket 4700. Patch by Mahrud Sayrafi.
6961 o Major features (onion services, UI change):
6962 - For a newly created onion service, the default version is now 3.
6963 Tor still supports existing version 2 services, but the operator
6964 now needs to set "HiddenServiceVersion 2" in order to create a new
6965 version 2 service. For existing services, Tor now learns the
6966 version by reading the key file. Closes ticket 27215.
6968 o Major features (portability, cryptography, experimental, TLS):
6969 - Tor now has the option to compile with the NSS library instead of
6970 OpenSSL. This feature is experimental, and we expect that bugs may
6971 remain. It is mainly intended for environments where Tor's
6972 performance is not CPU-bound, and where NSS is already known to be
6973 installed. To try it out, configure Tor with the --enable-nss
6974 flag. Closes tickets 26631, 26815, and 26816.
6976 If you are experimenting with this option and using an old cached
6977 consensus, Tor may fail to start. To solve this, delete your
6978 "cached-consensus" and "cached-microdesc-consensus" files,
6979 (if present), and restart Tor.
6981 o Major features (relay, UI change):
6982 - Relays no longer run as exits by default. If the "ExitRelay"
6983 option is auto (or unset), and no exit policy is specified with
6984 ExitPolicy or ReducedExitPolicy, we now treat ExitRelay as 0.
6985 Previously in this case, we allowed exit traffic and logged a
6986 warning message. Closes ticket 21530. Patch by Neel Chauhan.
6987 - Tor now validates that the ContactInfo config option is valid UTF-
6988 8 when parsing torrc. Closes ticket 27428.
6990 o Major bugfixes (compilation):
6991 - Fix compilation on ARM (and other less-used CPUs) when compiling
6992 with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
6994 o Major bugfixes (compilation, rust):
6995 - Rust tests can now build and run successfully with the
6996 --enable-fragile-hardening option enabled. Doing this currently
6997 requires the rust beta channel; it will be possible with stable
6998 rust once Rust version 1.31 is released. Patch from Alex Crichton.
6999 Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.
7001 o Major bugfixes (directory authority):
7002 - Actually check that the address we get from DirAuthority
7003 configuration line is valid IPv4. Explicitly disallow DirAuthority
7004 address to be a DNS hostname. Fixes bug 26488; bugfix
7007 o Major bugfixes (embedding, main loop):
7008 - When DisableNetwork becomes set, actually disable periodic events
7009 that are already enabled. (Previously, we would refrain from
7010 enabling new ones, but we would leave the old ones turned on.)
7011 Fixes bug 28348; bugfix on 0.3.4.1-alpha.
7013 o Major bugfixes (main loop, bootstrap):
7014 - Make sure Tor bootstraps and works properly if only the
7015 ControlPort is set. Prior to this fix, Tor would only bootstrap
7016 when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
7017 port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
7019 o Major bugfixes (onion service v3):
7020 - On an intro point for a version 3 onion service, stop closing
7021 introduction circuits on a NACK. This lets the client decide
7022 whether to reuse the circuit or discard it. Previously, we closed
7023 intro circuits when sending NACKs. Fixes bug 27841; bugfix on
7024 0.3.2.1-alpha. Patch by Neel Chaunan.
7026 o Major bugfixes (OpenSSL, portability):
7027 - Fix our usage of named groups when running as a TLS 1.3 client in
7028 OpenSSL 1.1.1. Previously, we only initialized EC groups when
7029 running as a relay, which caused clients to fail to negotiate TLS
7030 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
7033 o Major bugfixes (relay bandwidth statistics):
7034 - When we close relayed circuits, report the data in the circuit
7035 queues as being written in our relay bandwidth stats. This
7036 mitigates guard discovery and other attacks that close circuits
7037 for the explicit purpose of noticing this discrepancy in
7038 statistics. Fixes bug 23512; bugfix on 0.0.8pre3.
7040 o Major bugfixes (relay):
7041 - When our write bandwidth limit is exhausted, stop writing on the
7042 connection. Previously, we had a typo in the code that would make
7043 us stop reading instead, leading to relay connections being stuck
7044 indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
7046 - Always reactivate linked connections in the main loop so long as
7047 any linked connection has been active. Previously, connections
7048 serving directory information wouldn't get reactivated after the
7049 first chunk of data was sent (usually 32KB), which would prevent
7050 clients from bootstrapping. Fixes bug 28912; bugfix on
7051 0.3.4.1-alpha. Patch by "cypherpunks3".
7053 o Major bugfixes (restart-in-process):
7054 - Fix a use-after-free error that could be caused by passing Tor an
7055 impossible set of options that would fail during options_act().
7056 Fixes bug 27708; bugfix on 0.3.3.1-alpha.
7058 o Minor features (admin tools):
7059 - Add a new --key-expiration option to print the expiration date of
7060 the signing cert in an ed25519_signing_cert file. Resolves
7063 o Minor features (build):
7064 - If you pass the "--enable-pic" option to configure, Tor will try
7065 to tell the compiler to build position-independent code suitable
7066 to link into a dynamic library. (The default remains -fPIE, for
7067 code suitable for a relocatable executable.) Closes ticket 23846.
7069 o Minor features (code correctness, testing):
7070 - Tor's build process now includes a "check-includes" make target to
7071 verify that no module of Tor relies on any headers from a higher-
7072 level module. We hope to use this feature over time to help
7073 refactor our codebase. Closes ticket 26447.
7075 o Minor features (code layout):
7076 - We have a new "lowest-level" error-handling API for use by code
7077 invoked from within the logging module. With this interface, the
7078 logging code is no longer at risk of calling into itself if a
7079 failure occurs while it is trying to log something. Closes
7082 o Minor features (compilation):
7083 - When possible, place our warning flags in a separate file, to
7084 avoid flooding verbose build logs. Closes ticket 28924.
7085 - Tor's configure script now supports a --with-malloc= option to
7086 select your malloc implementation. Supported options are
7087 "tcmalloc", "jemalloc", "openbsd" (deprecated), and "system" (the
7088 default). Addresses part of ticket 20424. Based on a patch from
7091 o Minor features (config):
7092 - The "auto" keyword in torrc is now case-insensitive. Closes
7095 o Minor features (continuous integration):
7096 - Add a Travis CI build for --enable-nss on Linux gcc. Closes
7098 - Add new CI job to Travis configuration to run stem-based
7099 integration tests. Closes ticket 27913.
7100 - Use the Travis Homebrew addon to install packages on macOS during
7101 Travis CI. The package list is the same, but the Homebrew addon
7102 does not do a `brew update` by default. Implements ticket 27738.
7103 - Report what program produced the mysterious core file that we
7104 occasionally see on Travis CI during make distcheck. Closes
7106 - Don't do a distcheck with --disable-module-dirauth in Travis.
7107 Implements ticket 27252.
7108 - Install libcap-dev and libseccomp2-dev so these optional
7109 dependencies get tested on Travis CI. Closes ticket 26560.
7110 - Only run one online rust build in Travis, to reduce network
7111 errors. Skip offline rust builds on Travis for Linux gcc, because
7112 they're redundant. Implements ticket 27252.
7113 - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
7114 duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
7115 Linux with default settings, because all the non-default builds
7116 use gcc on Linux. Implements ticket 27252.
7118 o Minor features (continuous integration, Windows):
7119 - Always show the configure and test logs, and upload them as build
7120 artifacts, when building for Windows using Appveyor CI.
7122 - Build tor on Windows Server 2012 R2 and Windows Server 2016 using
7123 Appveyor's CI. Closes ticket 28318.
7125 o Minor features (controller):
7126 - Emit CIRC_BW events as soon as we detect that we processed an
7127 invalid or otherwise dropped cell on a circuit. This allows
7128 vanguards and other controllers to react more quickly to dropped
7129 cells. Closes ticket 27678.
7130 - For purposes of CIRC_BW-based dropped cell detection, track half-
7131 closed stream ids, and allow their ENDs, SENDMEs, DATA and path
7132 bias check cells to arrive without counting it as dropped until
7133 either the END arrives, or the windows are empty. Closes
7135 - Implement a 'GETINFO md/all' controller command to enable getting
7136 all known microdescriptors. Closes ticket 8323.
7137 - The GETINFO command now support an "uptime" argument, to return
7138 Tor's uptime in seconds. Closes ticket 25132.
7140 o Minor features (denial-of-service avoidance):
7141 - Make our OOM handler aware of the DNS cache so that it doesn't
7142 fill up the memory. This check is important for our DoS mitigation
7143 subsystem. Closes ticket 18642. Patch by Neel Chauhan.
7145 o Minor features (development):
7146 - Tor's makefile now supports running the "clippy" Rust style tool
7147 on our Rust code. Closes ticket 22156.
7149 o Minor features (directory authority):
7150 - There is no longer an artificial upper limit on the length of
7151 bandwidth lines. Closes ticket 26223.
7152 - When a bandwidth file is used to obtain the bandwidth measurements,
7153 include this bandwidth file headers in the votes. Closes
7155 - Improved support for networks with only a single authority or a
7156 single fallback directory. Patch from Gabriel Somlo. Closes
7159 o Minor features (embedding API):
7160 - The Tor controller API now supports a function to launch Tor with
7161 a preconstructed owning controller FD, so that embedding
7162 applications don't need to manage controller ports and
7163 authentication. Closes ticket 24204.
7164 - The Tor controller API now has a function that returns the name
7165 and version of the backend implementing the API. Closes
7168 o Minor features (fallback directory list):
7169 - Replace the 150 fallbacks originally introduced in Tor
7170 0.3.3.1-alpha in January 2018 (of which ~115 were still
7171 functional), with a list of 157 fallbacks (92 new, 65 existing, 85
7172 removed) generated in December 2018. Closes ticket 24803.
7174 o Minor features (geoip):
7175 - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
7176 Country database. Closes ticket 29012.
7178 o Minor features (memory management):
7179 - Get Libevent to use the same memory allocator as Tor, by calling
7180 event_set_mem_functions() during initialization. Resolves
7183 o Minor features (memory usage):
7184 - When not using them, store legacy TAP public onion keys in DER-
7185 encoded format, rather than as expanded public keys. This should
7186 save several megabytes on typical clients. Closes ticket 27246.
7188 o Minor features (OpenSSL bug workaround):
7189 - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
7190 key export function from handling long labels. When this bug is
7191 detected, Tor will disable TLS 1.3. We recommend upgrading to a
7192 version of OpenSSL without this bug when it becomes available.
7193 Closes ticket 28973.
7195 o Minor features (OpenSSL):
7196 - When possible, use RFC5869 HKDF implementation from OpenSSL rather
7197 than our own. Resolves ticket 19979.
7199 o Minor features (performance):
7200 - Remove about 96% of the work from the function that we run at
7201 startup to test our curve25519_basepoint implementation. Since
7202 this function has yet to find an actual failure, we now only run
7203 it for 8 iterations instead of 200. Based on our profile
7204 information, this change should save around 8% of our startup time
7205 on typical desktops, and may have a similar effect on other
7206 platforms. Closes ticket 28838.
7207 - Stop re-validating our hardcoded Diffie-Hellman parameters on
7208 every startup. Doing this wasted time and cycles, especially on
7209 low-powered devices. Closes ticket 28851.
7211 o Minor features (Rust, code quality):
7212 - Improve rust code quality in the rust protover implementation by
7213 making it more idiomatic. Includes changing an internal API to
7214 take &str instead of &String. Closes ticket 26492.
7216 o Minor features (testing):
7217 - Add scripts/test/chutney-git-bisect.sh, for bisecting using
7218 chutney. Implements ticket 27211.
7220 o Minor features (tor-resolve):
7221 - The tor-resolve utility can now be used with IPv6 SOCKS proxies.
7222 Side-effect of the refactoring for ticket 26526.
7224 o Minor features (UI):
7225 - Log each included configuration file or directory as we read it,
7226 to provide more visibility about where Tor is reading from. Patch
7227 from Unto Sten; closes ticket 27186.
7228 - Lower log level of "Scheduler type KIST has been enabled" to INFO.
7229 Closes ticket 26703.
7231 o Minor bugfixes (32-bit OSX and iOS, timing):
7232 - Fix an integer overflow bug in our optimized 32-bit millisecond-
7233 difference algorithm for 32-bit Apple platforms. Previously, it
7234 would overflow when calculating the difference between two times
7235 more than 47 days apart. Fixes part of bug 27139; bugfix
7237 - Improve the precision of our 32-bit millisecond difference
7238 algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
7239 bugfix on 0.3.4.1-alpha.
7240 - Relax the tolerance on the mainloop/update_time_jumps test when
7241 running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
7244 o Minor bugfixes (bootstrap):
7245 - Try harder to get descriptors in non-exit test networks, by using
7246 the mid weight for the third hop when there are no exits. Fixes
7247 bug 27237; bugfix on 0.2.6.2-alpha.
7249 o Minor bugfixes (C correctness):
7250 - Avoid casting smartlist index to int implicitly, as it may trigger
7251 a warning (-Wshorten-64-to-32). Fixes bug 26282; bugfix on
7252 0.2.3.13-alpha, 0.2.7.1-alpha and 0.2.1.1-alpha.
7253 - Use time_t for all values in
7254 predicted_ports_prediction_time_remaining(). Rework the code that
7255 computes difference between durations/timestamps. Fixes bug 27165;
7256 bugfix on 0.3.1.1-alpha.
7258 o Minor bugfixes (client, memory usage):
7259 - When not running as a directory cache, there is no need to store
7260 the text of the current consensus networkstatus in RAM.
7261 Previously, however, clients would store it anyway, at a cost of
7262 over 5 MB. Now, they do not. Fixes bug 27247; bugfix
7265 o Minor bugfixes (client, ReachableAddresses):
7266 - Instead of adding a "reject *:*" line to ReachableAddresses when
7267 loading the configuration, add one to the policy after parsing it
7268 in parse_reachable_addresses(). This prevents extra "reject *.*"
7269 lines from accumulating on reloads. Fixes bug 20874; bugfix on
7270 0.1.1.5-alpha. Patch by Neel Chauhan.
7272 o Minor bugfixes (code quality):
7273 - Rename sandbox_getaddrinfo() and other functions to no longer
7274 misleadingly suggest that they are sandbox-only. Fixes bug 26525;
7275 bugfix on 0.2.7.1-alpha.
7277 o Minor bugfixes (code safety):
7278 - Rewrite our assertion macros so that they no longer suppress the
7279 compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
7282 o Minor bugfixes (compilation):
7283 - Initialize a variable unconditionally in aes_new_cipher(), since
7284 some compilers cannot tell that we always initialize it before
7285 use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
7287 o Minor bugfixes (configuration):
7288 - Refuse to start with relative file paths and RunAsDaemon set
7289 (regression from the fix for bug 22731). Fixes bug 28298; bugfix
7292 o Minor bugfixes (configuration, Onion Services):
7293 - In rend_service_parse_port_config(), disallow any input to remain
7294 after address-port pair was parsed. This will catch address and
7295 port being whitespace-separated by mistake of the user. Fixes bug
7296 27044; bugfix on 0.2.9.10.
7298 o Minor bugfixes (connection, relay):
7299 - Avoid a logging a BUG() stacktrace when closing connection held
7300 open because the write side is rate limited but not the read side.
7301 Now, the connection read side is simply shut down until Tor is
7302 able to flush the connection and close it. Fixes bug 27750; bugfix
7305 o Minor bugfixes (continuous integration, Windows):
7306 - Stop reinstalling identical packages in our Windows CI. Fixes bug
7307 27464; bugfix on 0.3.4.1-alpha.
7308 - Install only the necessary mingw packages during our appveyor
7309 builds. This change makes the build a little faster, and prevents
7310 a conflict with a preinstalled mingw openssl that appveyor now
7311 ships. Fixes bugs 27765 and 27943; bugfix on 0.3.4.2-alpha.
7312 - Explicitly specify the path to the OpenSSL library and do not
7313 download OpenSSL from Pacman, but instead use the library that is
7314 already provided by AppVeyor. Fixes bug 28574; bugfix on master.
7315 - Manually configure the zstd compiler options, when building using
7316 mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
7317 not come with a pkg-config file. Fixes bug 28454; bugfix
7319 - Stop using an external OpenSSL install, and stop installing MSYS2
7320 packages, when building using mingw on Appveyor Windows CI. Fixes
7321 bug 28399; bugfix on 0.3.4.1-alpha.
7323 o Minor bugfixes (controller):
7324 - Consider all routerinfo errors other than "not a server" to be
7325 transient for the purpose of "GETINFO exit-policy/*" controller
7326 request. Print stacktrace in the unlikely case of failing to
7327 recompute routerinfo digest. Fixes bug 27034; bugfix
7330 o Minor bugfixes (correctness):
7331 - Fix an unreached code path where we checked the value of
7332 "hostname" inside send_resolved_hostname_cell(). Previously, we
7333 used it before checking it; now we check it first. Fixes bug
7334 28879; bugfix on 0.1.2.7-alpha.
7336 o Minor bugfixes (directory connection shutdown):
7337 - Avoid a double-close when shutting down a stalled directory
7338 connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
7340 o Minor bugfixes (directory permissions):
7341 - When a user requests a group-readable DataDirectory, give it to
7342 them. Previously, when the DataDirectory and the CacheDirectory
7343 were the same, the default setting (0) for
7344 CacheDirectoryGroupReadable would override the setting for
7345 DataDirectoryGroupReadable. Fixes bug 26913; bugfix
7348 o Minor bugfixes (HTTP tunnel):
7349 - Fix a bug warning when closing an HTTP tunnel connection due to an
7350 HTTP request we couldn't handle. Fixes bug 26470; bugfix
7353 o Minor bugfixes (ipv6):
7354 - In addrs_in_same_network_family(), we choose the subnet size based
7355 on the IP version (IPv4 or IPv6). Previously, we chose a fixed
7356 subnet size of /16 for both IPv4 and IPv6 addresses. Fixes bug
7357 15518; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan.
7359 o Minor bugfixes (Linux seccomp2 sandbox):
7360 - Permit the "shutdown()" system call, which is apparently used by
7361 OpenSSL under some circumstances. Fixes bug 28183; bugfix
7364 o Minor bugfixes (logging):
7365 - Stop talking about the Named flag in log messages. Clients have
7366 ignored the Named flag since 0.3.2. Fixes bug 28441; bugfix
7368 - As a precaution, do an early return from log_addr_has_changed() if
7369 Tor is running as client. Also, log a stack trace for debugging as
7370 this function should only be called when Tor runs as server. Fixes
7371 bug 26892; bugfix on 0.1.1.9-alpha.
7372 - Refrain from mentioning bug 21018 in the logs, as it is already
7373 fixed. Fixes bug 25477; bugfix on 0.2.9.8.
7375 o Minor bugfixes (logging, documentation):
7376 - When SafeLogging is enabled, scrub IP address in
7377 channel_tls_process_netinfo_cell(). Also, add a note to manpage
7378 that scrubbing is not guaranteed on loglevels below Notice. Fixes
7379 bug 26882; bugfix on 0.2.4.10-alpha.
7381 o Minor bugfixes (memory leaks):
7382 - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
7383 bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
7384 - Fix a small memory leak when calling Tor with --dump-config. Fixes
7385 bug 27893; bugfix on 0.3.2.1-alpha.
7387 o Minor bugfixes (netflow padding):
7388 - Ensure circuitmux queues are empty before scheduling or sending
7389 padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
7391 o Minor bugfixes (onion service v2):
7392 - Log at level "info", not "warning", in the case that we do not
7393 have a consensus when a .onion request comes in. This can happen
7394 normally while bootstrapping. Fixes bug 27040; bugfix
7397 o Minor bugfixes (onion service v3):
7398 - When deleting an ephemeral onion service (DEL_ONION), do not close
7399 any rendezvous circuits in order to let the existing client
7400 connections finish by themselves or closed by the application. The
7401 HS v2 is doing that already so now we have the same behavior for
7402 all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
7403 - Build the service descriptor's signing key certificate before
7404 uploading, so we always have a fresh one: leaving no chances for
7405 it to expire service side. Fixes bug 27838; bugfix
7407 - Stop dumping a stack trace when trying to connect to an intro
7408 point without having a descriptor for it. Fixes bug 27774; bugfix
7410 - When selecting a v3 rendezvous point, don't only look at the
7411 protover, but also check whether the curve25519 onion key is
7412 present. This way we avoid picking a relay that supports the v3
7413 rendezvous but for which we don't have the microdescriptor. Fixes
7414 bug 27797; bugfix on 0.3.2.1-alpha.
7415 - Close all SOCKS request (for the same .onion) if the newly fetched
7416 descriptor is unusable. Before that, we would close only the first
7417 one leaving the other hanging and let to time out by themselves.
7418 Fixes bug 27410; bugfix on 0.3.2.1-alpha.
7419 - When the onion service directory can't be created or has the wrong
7420 permissions, do not log a stack trace. Fixes bug 27335; bugfix
7422 - When replacing a descriptor in the client cache, make sure to
7423 close all client introduction circuits for the old descriptor, so
7424 we don't end up with unusable leftover circuits. Fixes bug 27471;
7425 bugfix on 0.3.2.1-alpha.
7427 o Minor bugfixes (OS compatibility):
7428 - Properly handle configuration changes that move a listener to/from
7429 wildcard IP address. If the first attempt to bind a socket fails,
7430 close the old listener and try binding the socket again. Fixes bug
7431 17873; bugfix on 0.0.8pre-1.
7433 o Minor bugfixes (performance)::
7434 - Rework node_is_a_configured_bridge() to no longer call
7435 node_get_all_orports(), which was performing too many memory
7436 allocations. Fixes bug 27224; bugfix on 0.2.3.9.
7438 o Minor bugfixes (protover):
7439 - Reject protocol names containing bytes other than alphanumeric
7440 characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
7443 o Minor bugfixes (protover, rust):
7444 - Reject extra commas in version strings. Fixes bug 27197; bugfix
7446 - protover_all_supported() would attempt to allocate up to 16GB on
7447 some inputs, leading to a potential memory DoS. Fixes bug 27206;
7448 bugfix on 0.3.3.5-rc.
7449 - Compute protover votes correctly in the rust version of the
7450 protover code. Previously, the protover rewrite in 24031 allowed
7451 repeated votes from the same voter for the same protocol version
7452 to be counted multiple times in protover_compute_vote(). Fixes bug
7453 27649; bugfix on 0.3.3.5-rc.
7454 - Reject protover names that contain invalid characters. Fixes bug
7455 27687; bugfix on 0.3.3.1-alpha.
7457 o Minor bugfixes (relay shutdown, systemd):
7458 - Notify systemd of ShutdownWaitLength so it can be set to longer
7459 than systemd's TimeoutStopSec. In Tor's systemd service file, set
7460 TimeoutSec to 60 seconds to allow Tor some time to shut down.
7461 Fixes bug 28113; bugfix on 0.2.6.2-alpha.
7463 o Minor bugfixes (relay statistics):
7464 - Update relay descriptor on bandwidth changes only when the uptime
7465 is smaller than 24h, in order to reduce the efficiency of guard
7466 discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
7468 o Minor bugfixes (relay):
7469 - Consider the fact that we'll be making direct connections to our
7470 entry and guard nodes when computing the fraction of nodes that
7471 have their descriptors. Also, if we are using bridges and there is
7472 at least one bridge with a full descriptor, treat the fraction of
7473 guards available as 100%. Fixes bug 25886; bugfix on 0.2.4.10-alpha.
7474 Patch by Neel Chauhan.
7475 - Update the message logged on relays when DirCache is disabled.
7476 Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the
7477 Guard flag. Fixes bug 24312; bugfix on 0.3.3.5-rc.
7479 o Minor bugfixes (testing):
7480 - Stop running stem's unit tests as part of "make test-stem", but
7481 continue to run stem's unit and online tests during "make test-
7482 stem-full". Fixes bug 28568; bugfix on 0.2.6.3-alpha.
7483 - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
7484 bugfix on 0.3.0.1-alpha.
7485 - Make the hs_service tests use the same time source when creating
7486 the introduction point and when testing it. Now tests work better
7487 on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
7489 - Revise the "conditionvar_timeout" test so that it succeeds even on
7490 heavily loaded systems where the test threads are not scheduled
7491 within 200 msec. Fixes bug 27073; bugfix on 0.2.6.3-alpha.
7492 - Fix two unit tests to work when HOME environment variable is not
7493 set. Fixes bug 27096; bugfix on 0.2.8.1-alpha.
7494 - If a unit test running in a subprocess exits abnormally or with a
7495 nonzero status code, treat the test as having failed, even if the
7496 test reported success. Without this fix, memory leaks don't cause
7497 the tests to fail, even with LeakSanitizer. Fixes bug 27658;
7498 bugfix on 0.2.2.4-alpha.
7499 - When logging a version mismatch in our openssl_version tests,
7500 report the actual offending version strings. Fixes bug 26152;
7501 bugfix on 0.2.9.1-alpha.
7502 - Fix forking tests on Windows when there is a space somewhere in
7503 the path. Fixes bug 26437; bugfix on 0.2.2.4-alpha.
7505 o Minor bugfixes (Windows):
7506 - Correctly identify Windows 8.1, Windows 10, and Windows Server
7507 2008 and later from their NT versions. Fixes bug 28096; bugfix on
7508 0.2.2.34; reported by Keifer Bly.
7509 - On recent Windows versions, the GetVersionEx() function may report
7510 an earlier Windows version than the running OS. To avoid user
7511 confusion, add "[or later]" to Tor's version string on affected
7512 versions of Windows. Fixes bug 28096; bugfix on 0.2.2.34; reported
7514 - Remove Windows versions that were never supported by the
7515 GetVersionEx() function. Stop duplicating the latest Windows
7516 version in get_uname(). Fixes bug 28096; bugfix on 0.2.2.34;
7517 reported by Keifer Bly.
7519 o Code simplification and refactoring:
7520 - When parsing a port configuration, make it more obvious to static
7521 analyzer tools that we always initialize the address. Closes
7523 - Divide more large Tor source files -- especially ones that span
7524 multiple areas of functionality -- into smaller parts, including
7525 onion.c and main.c. Closes ticket 26747.
7526 - Divide the "routerparse.c" module into separate modules for each
7527 group of parsed objects. Closes ticket 27924.
7528 - Move protover_rust.c to the same place protover.c was moved to.
7529 Closes ticket 27814.
7530 - Split directory.c into separate pieces for client, server, and
7531 common functionality. Closes ticket 26744.
7532 - Split the non-statistics-related parts from the rephist.c and
7533 geoip.c modules. Closes ticket 27892.
7534 - Split the router.c file into relay-only and shared components, to
7535 help with future modularization. Closes ticket 27864.
7536 - Divide the routerlist.c and dirserv.c modules into smaller parts.
7537 Closes ticket 27799.
7538 - 'updateFallbackDirs.py' now ignores the blacklist file, as it's not
7539 longer needed. Closes ticket 26502.
7540 - Include paths to header files within Tor are now qualified by
7541 directory within the top-level src directory.
7542 - Many structures have been removed from the centralized "or.h"
7543 header, and moved into their own headers. This will allow us to
7544 reduce the number of places in the code that rely on each
7545 structure's contents and layout. Closes ticket 26383.
7546 - Remove ATTR_NONNULL macro from codebase. Resolves ticket 26527.
7547 - Remove GetAdaptersAddresses_fn_t. The code that used it was
7548 removed as part of the 26481 refactor. Closes ticket 27467.
7549 - Rework Tor SOCKS server code to use Trunnel and benefit from
7550 autogenerated functions for parsing and generating SOCKS wire
7551 format. New implementation is cleaner, more maintainable and
7552 should be less prone to heartbleed-style vulnerabilities.
7553 Implements a significant fraction of ticket 3569.
7554 - Split sampled_guards_update_from_consensus() and
7555 select_entry_guard_for_circuit() into subfunctions. In
7556 entry_guards_update_primary() unite three smartlist enumerations
7557 into one and move smartlist comparison code out of the function.
7558 Closes ticket 21349.
7559 - Tor now assumes that you have standards-conformant stdint.h and
7560 inttypes.h headers when compiling. Closes ticket 26626.
7561 - Unify our bloom filter logic. Previously we had two copies of this
7562 code: one for routerlist filtering, and one for address set
7563 calculations. Closes ticket 26510.
7564 - Use the simpler strcmpstart() helper in
7565 rend_parse_v2_service_descriptor instead of strncmp(). Closes
7567 - Utility functions that can perform a DNS lookup are now wholly
7568 separated from those that can't, in separate headers and C
7569 modules. Closes ticket 26526.
7572 - In the tor-resolve(1) manpage, fix the reference to socks-
7573 extensions.txt by adding a web URL. Resolves ticket 27853.
7574 - Mention that we require Python to be 2.7 or newer for some
7575 integration tests that we ship with Tor. Resolves ticket 27677.
7576 - Copy paragraph and URL to Tor's code of conduct document from
7577 CONTRIBUTING to new CODE_OF_CONDUCT file. Resolves ticket 26638.
7578 - Remove old instructions from INSTALL document. Closes ticket 26588.
7579 - Warn users that they should not include MyFamily line(s) in their
7580 torrc when running Tor bridge. Closes ticket 26908.
7583 - Tor no longer supports building with the dmalloc library. For
7584 debugging memory issues, we suggest using gperftools or msan
7585 instead. Closes ticket 26426.
7586 - Tor no longer attempts to run on Windows environments without the
7587 GetAdaptersAddresses() function. This function has existed since
7588 Windows XP, which is itself already older than we support.
7589 - Remove Tor2web functionality for version 2 onion services. The
7590 Tor2webMode and Tor2webRendezvousPoints options are now obsolete.
7591 (This feature was never shipped in vanilla Tor and it was only
7592 possible to use this feature by building the support at compile
7593 time. Tor2webMode is not implemented for version 3 onion services.)
7594 Closes ticket 26367.
7597 - Increase logging and tag all log entries with timestamps in
7598 test_rebind.py. Provides diagnostics for issue 28229.
7600 o Code simplification and refactoring (shared random, dirauth):
7601 - Change many tor_assert() to use BUG() instead. The idea is to not
7602 crash a dirauth but rather scream loudly with a stacktrace and let
7603 it continue run. The shared random subsystem is very resilient and
7604 if anything wrong happens with it, at worst a non coherent value
7605 will be put in the vote and discarded by the other authorities.
7606 Closes ticket 19566.
7608 o Documentation (onion services):
7609 - Improve HSv3 client authorization by making some options more
7610 explicit and detailed. Closes ticket 28026. Patch by Mike Tigas.
7611 - Document in the man page that changing ClientOnionAuthDir value or
7612 adding a new file in the directory will not work at runtime upon
7613 sending a HUP if Sandbox 1. Closes ticket 28128.
7614 - Note in the man page that the only real way to fully revoke an
7615 onion service v3 client authorization is by restarting the tor
7616 process. Closes ticket 28275.
7619 Changes in version 0.3.4.9 - 2018-11-02
7620 Tor 0.3.4.9 is the second stable release in its series; it backports
7621 numerous fixes, including a fix for a bandwidth management bug that
7622 was causing memory exhaustion on relays. Anyone running an earlier
7623 version of Tor 0.3.4.9 should upgrade.
7625 o Major bugfixes (compilation, backport from 0.3.5.3-alpha):
7626 - Fix compilation on ARM (and other less-used CPUs) when compiling
7627 with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
7629 o Major bugfixes (mainloop, bootstrap, backport from 0.3.5.3-alpha):
7630 - Make sure Tor bootstraps and works properly if only the
7631 ControlPort is set. Prior to this fix, Tor would only bootstrap
7632 when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
7633 port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
7635 o Major bugfixes (relay, backport from 0.3.5.3-alpha):
7636 - When our write bandwidth limit is exhausted, stop writing on the
7637 connection. Previously, we had a typo in the code that would make
7638 us stop reading instead, leading to relay connections being stuck
7639 indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
7642 o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
7643 - Fix a use-after-free error that could be caused by passing Tor an
7644 impossible set of options that would fail during options_act().
7645 Fixes bug 27708; bugfix on 0.3.3.1-alpha.
7647 o Minor features (continuous integration, backport from 0.3.5.1-alpha):
7648 - Don't do a distcheck with --disable-module-dirauth in Travis.
7649 Implements ticket 27252.
7650 - Only run one online rust build in Travis, to reduce network
7651 errors. Skip offline rust builds on Travis for Linux gcc, because
7652 they're redundant. Implements ticket 27252.
7653 - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
7654 duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
7655 Linux with default settings, because all the non-default builds
7656 use gcc on Linux. Implements ticket 27252.
7658 o Minor features (continuous integration, backport from 0.3.5.3-alpha):
7659 - Use the Travis Homebrew addon to install packages on macOS during
7660 Travis CI. The package list is the same, but the Homebrew addon
7661 does not do a `brew update` by default. Implements ticket 27738.
7663 o Minor features (geoip):
7664 - Update geoip and geoip6 to the October 9 2018 Maxmind GeoLite2
7665 Country database. Closes ticket 27991.
7667 o Minor bugfixes (32-bit OSX and iOS, timing, backport from 0.3.5.2-alpha):
7668 - Fix an integer overflow bug in our optimized 32-bit millisecond-
7669 difference algorithm for 32-bit Apple platforms. Previously, it
7670 would overflow when calculating the difference between two times
7671 more than 47 days apart. Fixes part of bug 27139; bugfix
7673 - Improve the precision of our 32-bit millisecond difference
7674 algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
7675 bugfix on 0.3.4.1-alpha.
7676 - Relax the tolerance on the mainloop/update_time_jumps test when
7677 running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
7680 o Minor bugfixes (C correctness, to appear in 0.3.5.4-alpha):
7681 - Avoid undefined behavior in an end-of-string check when parsing
7682 the BEGIN line in a directory object. Fixes bug 28202; bugfix
7685 o Minor bugfixes (CI, appveyor, to appear in 0.3.5.4-alpha):
7686 - Only install the necessary mingw packages during our appveyor
7687 builds. This change makes the build a little faster, and prevents
7688 a conflict with a preinstalled mingw openssl that appveyor now
7689 ships. Fixes bugs 27943 and 27765; bugfix on 0.3.4.2-alpha.
7691 o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
7692 - Rewrite our assertion macros so that they no longer suppress the
7693 compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
7695 o Minor bugfixes (continuous integration, backport from 0.3.5.1-alpha):
7696 - Stop reinstalling identical packages in our Windows CI. Fixes bug
7697 27464; bugfix on 0.3.4.1-alpha.
7699 o Minor bugfixes (directory authority, to appear in 0.3.5.4-alpha):
7700 - Log additional info when we get a relay that shares an ed25519 ID
7701 with a different relay, instead making a BUG() warning. Fixes bug
7702 27800; bugfix on 0.3.2.1-alpha.
7704 o Minor bugfixes (directory connection shutdown, backport from 0.3.5.1-alpha):
7705 - Avoid a double-close when shutting down a stalled directory
7706 connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
7708 o Minor bugfixes (HTTP tunnel, backport from 0.3.5.1-alpha):
7709 - Fix a bug warning when closing an HTTP tunnel connection due to an
7710 HTTP request we couldn't handle. Fixes bug 26470; bugfix
7713 o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
7714 - Ensure circuitmux queues are empty before scheduling or sending
7715 padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
7717 o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
7718 - When the onion service directory can't be created or has the wrong
7719 permissions, do not log a stack trace. Fixes bug 27335; bugfix
7722 o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
7723 - Close all SOCKS request (for the same .onion) if the newly fetched
7724 descriptor is unusable. Before that, we would close only the first
7725 one leaving the other hanging and let to time out by themselves.
7726 Fixes bug 27410; bugfix on 0.3.2.1-alpha.
7728 o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
7729 - When selecting a v3 rendezvous point, don't only look at the
7730 protover, but also check whether the curve25519 onion key is
7731 present. This way we avoid picking a relay that supports the v3
7732 rendezvous but for which we don't have the microdescriptor. Fixes
7733 bug 27797; bugfix on 0.3.2.1-alpha.
7735 o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
7736 - Reject protocol names containing bytes other than alphanumeric
7737 characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
7740 o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
7741 - Compute protover votes correctly in the rust version of the
7742 protover code. Previously, the protover rewrite in 24031 allowed
7743 repeated votes from the same voter for the same protocol version
7744 to be counted multiple times in protover_compute_vote(). Fixes bug
7745 27649; bugfix on 0.3.3.5-rc.
7746 - Reject protover names that contain invalid characters. Fixes bug
7747 27687; bugfix on 0.3.3.1-alpha.
7749 o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
7750 - protover_all_supported() would attempt to allocate up to 16GB on
7751 some inputs, leading to a potential memory DoS. Fixes bug 27206;
7752 bugfix on 0.3.3.5-rc.
7754 o Minor bugfixes (rust, directory authority, to appear in 0.3.5.4-alpha):
7755 - Fix an API mismatch in the rust implementation of
7756 protover_compute_vote(). This bug could have caused crashes on any
7757 directory authorities running Tor with Rust (which we do not yet
7758 recommend). Fixes bug 27741; bugfix on 0.3.3.6.
7760 o Minor bugfixes (rust, to appear in 0.3.5.4-alpha):
7761 - Fix a potential null dereference in protover_all_supported(). Add
7762 a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
7763 - Return a string that can be safely freed by C code, not one
7764 created by the rust allocator, in protover_all_supported(). Fixes
7765 bug 27740; bugfix on 0.3.3.1-alpha.
7767 o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
7768 - If a unit test running in a subprocess exits abnormally or with a
7769 nonzero status code, treat the test as having failed, even if the
7770 test reported success. Without this fix, memory leaks don't cause
7771 the tests to fail, even with LeakSanitizer. Fixes bug 27658;
7772 bugfix on 0.2.2.4-alpha.
7774 o Minor bugfixes (testing, backport from 0.3.5.3-alpha):
7775 - Make the hs_service tests use the same time source when creating
7776 the introduction point and when testing it. Now tests work better
7777 on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
7780 o Minor bugfixes (testing, to appear in 0.3.5.4-alpha):
7781 - Treat backtrace test failures as expected on BSD-derived systems
7782 (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
7783 (FreeBSD failures have been treated as expected since 18204 in
7784 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
7787 Changes in version 0.2.9.17 - 2018-09-10
7788 Tor 0.2.9.17 backports numerous bugfixes from later versions of Tor.
7790 o Minor features (compatibility, backport from 0.3.4.8):
7791 - Tell OpenSSL to maintain backward compatibility with previous
7792 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
7793 ciphers are disabled by default. Closes ticket 27344.
7795 o Minor features (continuous integration, backport from 0.3.4.7-rc):
7796 - Enable macOS builds in our Travis CI configuration. Closes
7798 - Install libcap-dev and libseccomp2-dev so these optional
7799 dependencies get tested on Travis CI. Closes ticket 26560.
7800 - Run asciidoc during Travis CI. Implements ticket 27087.
7801 - Use ccache in our Travis CI configuration. Closes ticket 26952.
7803 o Minor features (geoip):
7804 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
7805 Country database. Closes ticket 27089.
7807 o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
7808 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
7809 tell the compiler not to include the system malloc implementation.
7810 Fixes bug 20424; bugfix on 0.2.0.20-rc.
7812 o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
7813 - Silence a spurious compiler warning on the GetAdaptersAddresses
7814 function pointer cast. This issue is already fixed by 26481 in
7815 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
7816 bugfix on 0.2.3.11-alpha.
7817 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
7818 supported, and always fails. Some compilers warn about the
7819 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
7822 o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
7823 - Don't link or search for pthreads when building for Windows, even
7824 if we are using build environment (like mingw) that provides a
7825 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
7827 o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
7828 - Skip a pair of unreliable key generation tests on Windows, until
7829 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
7830 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
7832 o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
7833 - Pass the module flags to distcheck configure, and log the flags
7834 before running configure. (Backported to 0.2.9 and later as a
7835 precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
7837 o Minor bugfixes (continuous integration, backport from 0.3.4.8):
7838 - When a Travis build fails, and showing a log fails, keep trying to
7839 show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
7840 - When we use echo in Travis, don't pass a --flag as the first
7841 argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
7843 o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
7844 - When voting for recommended versions, make sure that all of the
7845 versions are well-formed and parsable. Fixes bug 26485; bugfix
7848 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
7849 - Fix a bug in out sandboxing rules for the openat() syscall.
7850 Previously, no openat() call would be permitted, which would break
7851 filesystem operations on recent glibc versions. Fixes bug 25440;
7852 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
7854 o Minor bugfixes (onion services, backport from 0.3.4.8):
7855 - Silence a spurious compiler warning in
7856 rend_client_send_introduction(). Fixes bug 27463; bugfix
7859 o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
7860 - Log a protocol warning when single onion services or Tor2web clients
7861 fail to authenticate direct connections to relays.
7862 Fixes bug 26924; bugfix on 0.2.9.1-alpha.
7864 o Minor bugfixes (testing, backport from 0.3.4.6-rc):
7865 - Disable core dumps in test_bt.sh, to avoid failures in "make
7866 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
7868 o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
7869 - Before running make test-network-all, delete old logs and test
7870 result files, to avoid spurious failures. Fixes bug 27295; bugfix
7873 o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
7874 - Our "tortls/cert_matches_key" unit test no longer relies on
7875 OpenSSL internals. Previously, it relied on unsupported OpenSSL
7876 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
7877 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
7879 o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
7880 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
7881 27185; bugfix on 0.2.2.2-alpha.
7884 Changes in version 0.3.2.12 - 2018-09-10
7885 Tor 0.3.2.12 backport numerous fixes from later versions of Tor.
7887 o Minor features (compatibility, backport from 0.3.4.8):
7888 - Tell OpenSSL to maintain backward compatibility with previous
7889 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
7890 ciphers are disabled by default. Closes ticket 27344.
7892 o Minor features (continuous integration, backport from 0.3.4.7-rc):
7893 - Enable macOS builds in our Travis CI configuration. Closes
7895 - Install libcap-dev and libseccomp2-dev so these optional
7896 dependencies get tested on Travis CI. Closes ticket 26560.
7897 - Run asciidoc during Travis CI. Implements ticket 27087.
7898 - Use ccache in our Travis CI configuration. Closes ticket 26952.
7900 o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
7901 - Use cargo cache in our Travis CI configuration. Closes
7904 o Minor features (controller, backport from 0.3.4.6-rc):
7905 - The control port now exposes the list of HTTPTunnelPorts and
7906 ExtOrPorts via GETINFO net/listeners/httptunnel and
7907 net/listeners/extor respectively. Closes ticket 26647.
7909 o Minor features (directory authorities, backport from 0.3.4.7-rc):
7910 - Authorities no longer vote to make the subprotocol version
7911 "LinkAuth=1" a requirement: it is unsupportable with NSS, and
7912 hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
7914 o Minor features (geoip):
7915 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
7916 Country database. Closes ticket 27089.
7918 o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
7919 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
7920 tell the compiler not to include the system malloc implementation.
7921 Fixes bug 20424; bugfix on 0.2.0.20-rc.
7922 - Don't try to use a pragma to temporarily disable the
7923 -Wunused-const-variable warning if the compiler doesn't support
7924 it. Fixes bug 26785; bugfix on 0.3.2.11.
7926 o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
7927 - Silence a spurious compiler warning on the GetAdaptersAddresses
7928 function pointer cast. This issue is already fixed by 26481 in
7929 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
7930 bugfix on 0.2.3.11-alpha.
7931 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
7932 supported, and always fails. Some compilers warn about the
7933 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
7936 o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
7937 - Don't link or search for pthreads when building for Windows, even
7938 if we are using build environment (like mingw) that provides a
7939 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
7941 o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
7942 - Skip a pair of unreliable key generation tests on Windows, until
7943 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
7944 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
7946 o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
7947 - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
7948 - Pass the module flags to distcheck configure, and log the flags
7949 before running configure. (Backported to 0.2.9 and later as a
7950 precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
7952 o Minor bugfixes (continuous integration, backport from 0.3.4.8):
7953 - When a Travis build fails, and showing a log fails, keep trying to
7954 show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
7955 - When we use echo in Travis, don't pass a --flag as the first
7956 argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
7958 o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
7959 - When voting for recommended versions, make sure that all of the
7960 versions are well-formed and parsable. Fixes bug 26485; bugfix
7963 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
7964 - Fix a bug in out sandboxing rules for the openat() syscall.
7965 Previously, no openat() call would be permitted, which would break
7966 filesystem operations on recent glibc versions. Fixes bug 25440;
7967 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
7969 o Minor bugfixes (logging, backport from 0.3.4.6-rc):
7970 - Improve the log message when connection initiators fail to
7971 authenticate direct connections to relays. Fixes bug 26927; bugfix
7974 o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
7975 - Fix bug that causes services to not ever rotate their descriptors
7976 if they were getting SIGHUPed often. Fixes bug 26932; bugfix
7979 o Minor bugfixes (onion services, backport from 0.3.4.8):
7980 - Silence a spurious compiler warning in
7981 rend_client_send_introduction(). Fixes bug 27463; bugfix
7984 o Minor bugfixes (rust, backport from 0.3.4.7-rc):
7985 - Backport test_rust.sh from master. Fixes bug 26497; bugfix
7987 - Consistently use ../../.. as a fallback for $abs_top_srcdir in
7988 test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
7989 - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
7990 $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
7992 o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
7993 - Log a protocol warning when single onion services or Tor2web clients
7994 fail to authenticate direct connections to relays.
7995 Fixes bug 26924; bugfix on 0.2.9.1-alpha.
7997 o Minor bugfixes (testing, backport from 0.3.4.6-rc):
7998 - Disable core dumps in test_bt.sh, to avoid failures in "make
7999 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
8001 o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
8002 - When running make test-network-all, use the mixed+hs-v2 network.
8003 (A previous fix to chutney removed v3 onion services from the
8004 mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
8005 confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
8006 - Before running make test-network-all, delete old logs and test
8007 result files, to avoid spurious failures. Fixes bug 27295; bugfix
8010 o Minor bugfixes (testing, openssl compatibility):
8011 - Our "tortls/cert_matches_key" unit test no longer relies on OpenSSL
8012 internals. Previously, it relied on unsupported OpenSSL behavior in
8013 a way that caused it to crash with OpenSSL 1.0.2p. Fixes bug 27226;
8014 bugfix on 0.2.5.1-alpha.
8016 o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
8017 - Our "tortls/cert_matches_key" unit test no longer relies on
8018 OpenSSL internals. Previously, it relied on unsupported OpenSSL
8019 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
8020 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
8022 o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
8023 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
8024 27185; bugfix on 0.2.2.2-alpha.
8027 Changes in version 0.3.3.10 - 2018-09-10
8028 Tor 0.3.3.10 backports numerous fixes from later versions of Tor.
8030 o Minor features (bug workaround, backport from 0.3.4.7-rc):
8031 - Compile correctly on systems that provide the C11 stdatomic.h
8032 header, but where C11 atomic functions don't actually compile.
8033 Closes ticket 26779; workaround for Debian issue 903709.
8035 o Minor features (compatibility, backport from 0.3.4.8):
8036 - Tell OpenSSL to maintain backward compatibility with previous
8037 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
8038 ciphers are disabled by default. Closes ticket 27344.
8040 o Minor features (continuous integration, backport from 0.3.4.7-rc):
8041 - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
8042 - Enable macOS builds in our Travis CI configuration. Closes
8044 - Install libcap-dev and libseccomp2-dev so these optional
8045 dependencies get tested on Travis CI. Closes ticket 26560.
8046 - Run asciidoc during Travis CI. Implements ticket 27087.
8047 - Use ccache in our Travis CI configuration. Closes ticket 26952.
8049 o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
8050 - Use cargo cache in our Travis CI configuration. Closes
8053 o Minor features (controller, backport from 0.3.4.6-rc):
8054 - The control port now exposes the list of HTTPTunnelPorts and
8055 ExtOrPorts via GETINFO net/listeners/httptunnel and
8056 net/listeners/extor respectively. Closes ticket 26647.
8058 o Minor features (directory authorities, backport from 0.3.4.7-rc):
8059 - Authorities no longer vote to make the subprotocol version
8060 "LinkAuth=1" a requirement: it is unsupportable with NSS, and
8061 hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
8063 o Minor features (geoip):
8064 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
8065 Country database. Closes ticket 27089.
8067 o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
8068 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
8069 tell the compiler not to include the system malloc implementation.
8070 Fixes bug 20424; bugfix on 0.2.0.20-rc.
8071 - Don't try to use a pragma to temporarily disable the
8072 -Wunused-const-variable warning if the compiler doesn't support
8073 it. Fixes bug 26785; bugfix on 0.3.2.11.
8075 o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
8076 - Silence a spurious compiler warning on the GetAdaptersAddresses
8077 function pointer cast. This issue is already fixed by 26481 in
8078 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
8079 bugfix on 0.2.3.11-alpha.
8080 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
8081 supported, and always fails. Some compilers warn about the
8082 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
8085 o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
8086 - Don't link or search for pthreads when building for Windows, even
8087 if we are using build environment (like mingw) that provides a
8088 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
8090 o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
8091 - Skip a pair of unreliable key generation tests on Windows, until
8092 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
8093 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
8095 o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
8096 - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
8097 - Pass the module flags to distcheck configure, and log the flags
8098 before running configure. (Backported to 0.2.9 and later as a
8099 precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
8101 o Minor bugfixes (continuous integration, backport from 0.3.4.8):
8102 - When a Travis build fails, and showing a log fails, keep trying to
8103 show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
8104 - When we use echo in Travis, don't pass a --flag as the first
8105 argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
8107 o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
8108 - When voting for recommended versions, make sure that all of the
8109 versions are well-formed and parsable. Fixes bug 26485; bugfix
8112 o Minor bugfixes (in-process restart, backport from 0.3.4.7-rc):
8113 - Always call tor_free_all() when leaving tor_run_main(). When we
8114 did not, restarting tor in-process would cause an assertion
8115 failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
8117 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
8118 - Fix a bug in our sandboxing rules for the openat() syscall.
8119 Previously, no openat() call would be permitted, which would break
8120 filesystem operations on recent glibc versions. Fixes bug 25440;
8121 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
8123 o Minor bugfixes (logging, backport from 0.3.4.6-rc):
8124 - Improve the log message when connection initiators fail to
8125 authenticate direct connections to relays. Fixes bug 26927; bugfix
8128 o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
8129 - Fix bug that causes services to not ever rotate their descriptors
8130 if they were getting SIGHUPed often. Fixes bug 26932; bugfix
8133 o Minor bugfixes (onion services, backport from 0.3.4.8):
8134 - Silence a spurious compiler warning in
8135 rend_client_send_introduction(). Fixes bug 27463; bugfix
8138 o Minor bugfixes (portability, backport from 0.3.4.6-rc):
8139 - Work around two different bugs in the OS X 10.10 and later SDKs
8140 that would prevent us from successfully targeting earlier versions
8141 of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
8143 o Minor bugfixes (portability, backport from 0.3.4.7-rc):
8144 - Fix compilation of the unit tests on GNU/Hurd, which does not
8145 define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
8148 o Minor bugfixes (rust, backport from 0.3.4.7-rc):
8149 - Backport test_rust.sh from master. Fixes bug 26497; bugfix
8151 - Consistently use ../../.. as a fallback for $abs_top_srcdir in
8152 test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
8153 - Protover parsing was accepting the presence of whitespace in
8154 version strings, which the C implementation would choke on, e.g.
8155 "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
8156 - Protover parsing was ignoring a 2nd hyphen and everything after
8157 it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
8159 - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
8160 $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
8161 - cd to ${abs_top_builddir}/src/rust before running cargo in
8162 src/test/test_rust.sh. This makes the working directory consistent
8163 between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
8165 o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
8166 - Log a protocol warning when single onion services or Tor2web clients
8167 fail to authenticate direct connections to relays.
8168 Fixes bug 26924; bugfix on 0.2.9.1-alpha.
8170 o Minor bugfixes (testing, backport from 0.3.4.6-rc):
8171 - Disable core dumps in test_bt.sh, to avoid failures in "make
8172 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
8174 o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
8175 - When running make test-network-all, use the mixed+hs-v2 network.
8176 (A previous fix to chutney removed v3 onion services from the
8177 mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
8178 confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
8179 - Before running make test-network-all, delete old logs and test
8180 result files, to avoid spurious failures. Fixes bug 27295; bugfix
8183 o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
8184 - Our "tortls/cert_matches_key" unit test no longer relies on
8185 OpenSSL internals. Previously, it relied on unsupported OpenSSL
8186 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
8187 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
8189 o Minor bugfixes (v3 onion services, backport from 0.3.4.6-rc):
8190 - Stop sending ed25519 link specifiers in v3 onion service introduce
8191 cells and descriptors, when the rendezvous or introduction point
8192 doesn't support ed25519 link authentication. Fixes bug 26627;
8193 bugfix on 0.3.2.4-alpha.
8195 o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
8196 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
8197 27185; bugfix on 0.2.2.2-alpha.
8200 Changes in version 0.3.4.8 - 2018-09-10
8201 Tor 0.3.4.8 is the first stable release in its series; it includes
8202 compilation and portability fixes.
8204 The Tor 0.3.4 series includes improvements for running Tor in
8205 low-power and embedded environments, which should help performance in
8206 general. We've begun work on better modularity, and included preliminary
8207 changes on the directory authority side to accommodate a new bandwidth
8208 measurement system. We've also integrated more continuous-integration
8209 systems into our development process, and made corresponding changes to
8210 Tor's testing infrastructure. Finally, we've continued to refine
8211 our anti-denial-of-service code.
8213 Below are the changes since 0.3.3.9. For a list of only the changes
8214 since 0.3.4.7-rc, see the ChangeLog file.
8216 o New system requirements:
8217 - Tor no longer tries to support old operating systems without
8218 mmap() or some local equivalent. Apparently, compilation on such
8219 systems has been broken for some time, without anybody noticing or
8220 complaining. Closes ticket 25398.
8222 o Major features (directory authority, modularization):
8223 - The directory authority subsystem has been modularized. The code
8224 is now located in src/or/dirauth/, and is compiled in by default.
8225 To disable the module, the configure option
8226 --disable-module-dirauth has been added. This module may be
8227 disabled by default in some future release. Closes ticket 25610.
8229 o Major features (main loop, CPU usage):
8230 - When Tor is disabled (via DisableNetwork or via hibernation), it
8231 no longer needs to run any per-second events. This change should
8232 make it easier for mobile applications to disable Tor while the
8233 device is sleeping, or Tor is not running. Closes ticket 26063.
8234 - Tor no longer enables all of its periodic events by default.
8235 Previously, Tor would enable all possible main loop events,
8236 regardless of whether it needed them. Furthermore, many of these
8237 events are now disabled when Tor is hibernating or DisableNetwork
8238 is set. This is a big step towards reducing client CPU usage by
8239 reducing the amount of wake-ups the daemon does. Closes tickets
8241 - The bandwidth-limitation logic has been refactored so that
8242 bandwidth calculations are performed on-demand, rather than every
8243 TokenBucketRefillInterval milliseconds. This change should improve
8244 the granularity of our bandwidth calculations, and limit the
8245 number of times that the Tor process needs to wake up when it is
8246 idle. Closes ticket 25373.
8247 - Move responsibility for many operations from a once-per-second
8248 callback to a callback that is only scheduled as needed. Moving
8249 this functionality has allowed us to disable the callback when
8250 Tor's network is disabled. Once enough items are removed from our
8251 once-per-second callback, we can eliminate it entirely to conserve
8252 CPU when idle. The functionality removed includes: closing
8253 connections, circuits, and channels (ticket 25932); consensus
8254 voting (25937); flushing log callbacks (25951); honoring delayed
8255 SIGNEWNYM requests (25949); rescanning the consensus cache
8256 (25931); saving the state file to disk (25948); warning relay
8257 operators about unreachable ports (25952); and keeping track of
8258 Tor's uptime (26009).
8260 o Minor features (accounting):
8261 - When Tor becomes dormant, it now uses a scheduled event to wake up
8262 at the right time. Previously, we would use the per-second timer
8263 to check whether to wake up, but we no longer have any per-second
8264 timers enabled when the network is disabled. Closes ticket 26064.
8266 o Minor features (bug workaround):
8267 - Compile correctly on systems that provide the C11 stdatomic.h
8268 header, but where C11 atomic functions don't actually compile.
8269 Closes ticket 26779; workaround for Debian issue 903709.
8271 o Minor features (code quality):
8272 - Add optional spell-checking for the Tor codebase, using the
8273 "misspell" program. To use this feature, run "make check-typos".
8274 Closes ticket 25024.
8276 o Minor features (compatibility):
8277 - Tell OpenSSL to maintain backward compatibility with previous
8278 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
8279 ciphers are disabled by default. Closes ticket 27344.
8280 - Tor now detects versions of OpenSSL 1.1.0 and later compiled with
8281 the no-deprecated option, and builds correctly with them. Closes
8282 tickets 19429, 19981, and 25353.
8284 o Minor features (compilation):
8285 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
8286 tell the compiler not to include the system malloc implementation.
8287 Fixes bug 20424; bugfix on 0.2.0.20-rc.
8288 - Don't try to use a pragma to temporarily disable the
8289 -Wunused-const-variable warning if the compiler doesn't support
8290 it. Fixes bug 26785; bugfix on 0.3.2.11.
8291 - When building Tor, prefer to use Python 3 over Python 2, and more
8292 recent (contemplated) versions over older ones. Closes
8295 o Minor features (compression, zstd):
8296 - When running with zstd, Tor now considers using advanced functions
8297 that the zstd maintainers have labeled as potentially unstable. To
8298 prevent breakage, Tor will only use this functionality when the
8299 runtime version of the zstd library matches the version with which
8300 Tor was compiled. Closes ticket 25162.
8302 o Minor features (configuration):
8303 - The "DownloadSchedule" options have been renamed to end with
8304 "DownloadInitialDelay". The old names are still allowed, but will
8305 produce a warning. Comma-separated lists are still permitted for
8306 these options, but all values after the first are ignored (as they
8307 have been since 0.2.9). Closes ticket 23354.
8309 o Minor features (continuous integration):
8310 - Log the compiler path and version during Appveyor builds.
8311 Implements ticket 27449.
8312 - Show config.log and test-suite.log after failed Appveyor builds.
8313 Also upload the zipped full logs as a build artifact. Implements
8315 - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
8316 - Enable macOS builds in our Travis CI configuration. Closes
8318 - Install libcap-dev and libseccomp2-dev so these optional
8319 dependencies get tested on Travis CI. Closes ticket 26560.
8320 - Only post Appveyor IRC notifications when the build fails.
8321 Implements ticket 27275.
8322 - Run asciidoc during Travis CI. Implements ticket 27087.
8323 - Use ccache in our Travis CI configuration. Closes ticket 26952.
8324 - Add the necessary configuration files for continuous integration
8325 testing on Windows, via the Appveyor platform. Closes ticket
8326 25549. Patches from Marcin Cieślak and Isis Lovecruft.
8328 o Minor features (continuous integration, rust):
8329 - Use cargo cache in our Travis CI configuration. Closes
8332 o Minor features (control port):
8333 - Introduce GETINFO "current-time/{local,utc}" to return the local
8334 and UTC times respectively in ISO format. This helps a controller
8335 like Tor Browser detect a time-related error. Closes ticket 25511.
8336 Patch by Neel Chauhan.
8337 - Introduce new fields to the CIRC_BW event. There are two new
8338 fields in each of the read and written directions. The DELIVERED
8339 fields report the total valid data on the circuit, as measured by
8340 the payload sizes of verified and error-checked relay command
8341 cells. The OVERHEAD fields report the total unused bytes in each
8342 of these cells. Closes ticket 25903.
8344 o Minor features (controller):
8345 - The control port now exposes the list of HTTPTunnelPorts and
8346 ExtOrPorts via GETINFO net/listeners/httptunnel and
8347 net/listeners/extor respectively. Closes ticket 26647.
8349 o Minor features (directory authorities):
8350 - Stop warning about incomplete bw lines before the first complete
8351 bw line has been found, so that additional header lines can be
8352 ignored. Fixes bug 25960; bugfix on 0.2.2.1-alpha
8353 - Authorities no longer vote to make the subprotocol version
8354 "LinkAuth=1" a requirement: it is unsupportable with NSS, and
8355 hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
8357 o Minor features (directory authority):
8358 - Directory authorities now open their key-pinning files as O_SYNC,
8359 to limit their chances of accidentally writing partial lines.
8360 Closes ticket 23909.
8362 o Minor features (directory authority, forward compatibility):
8363 - Make the lines of the measured bandwidth file able to contain
8364 their entries in any order. Previously, the node_id entry needed
8365 to come first. Closes ticket 26004.
8367 o Minor features (entry guards):
8368 - Introduce a new torrc option NumPrimaryGuards for controlling the
8369 number of primary guards. Closes ticket 25843.
8371 o Minor features (geoip):
8372 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
8373 Country database. Closes ticket 27089.
8375 o Minor features (performance):
8376 - Avoid a needless call to malloc() when processing an incoming
8377 relay cell. Closes ticket 24914.
8378 - Make our timing-wheel code run a tiny bit faster on 32-bit
8379 platforms, by preferring 32-bit math to 64-bit. Closes
8381 - Avoid a needless malloc()/free() pair every time we handle an ntor
8382 handshake. Closes ticket 25150.
8384 o Minor features (Rust, portability):
8385 - Rust cross-compilation is now supported. Closes ticket 25895.
8387 o Minor features (testing):
8388 - Add a unit test for voting_schedule_get_start_of_next_interval().
8389 Closes ticket 26014, and helps make unit test coverage
8391 - A new unittests module specifically for testing the functions in
8392 the (new-ish) bridges.c module has been created with new
8393 unittests, raising the code coverage percentages. Closes 25425.
8394 - We now have improved testing for addressmap_get_virtual_address()
8395 function. This should improve our test coverage, and make our test
8396 coverage more deterministic. Closes ticket 25993.
8398 o Minor features (timekeeping, circuit scheduling):
8399 - When keeping track of how busy each circuit have been recently on
8400 a given connection, use coarse-grained monotonic timers rather
8401 than gettimeofday(). This change should marginally increase
8402 accuracy and performance. Implements part of ticket 25927.
8404 o Minor features (unit tests):
8405 - Test complete bandwidth measurements files, and test that
8406 incomplete bandwidth lines only give warnings when the end of the
8407 header has not been detected. Fixes bug 25947; bugfix
8410 o Minor bugfixes (bandwidth management):
8411 - Consider ourselves "low on write bandwidth" if we have exhausted
8412 our write bandwidth some time in the last second. This was the
8413 documented behavior before, but the actual behavior was to change
8414 this value every TokenBucketRefillInterval. Fixes bug 25828;
8415 bugfix on 0.2.3.5-alpha.
8417 o Minor bugfixes (C correctness):
8418 - Add a missing lock acquisition in the shutdown code of the control
8419 subsystem. Fixes bug 25675; bugfix on 0.2.7.3-rc. Found by
8420 Coverity; this is CID 1433643.
8422 o Minor bugfixes (code style):
8423 - Fixed multiple includes of transports.h in src/or/connection.c
8424 Fixes bug 25261; bugfix on 0.2.5.1-alpha.
8425 - Remove the unused variable n_possible from the function
8426 channel_get_for_extend(). Fixes bug 25645; bugfix on 0.2.4.4-alpha
8428 o Minor bugfixes (compilation):
8429 - Silence a spurious compiler warning on the GetAdaptersAddresses
8430 function pointer cast. This issue is already fixed by 26481 in
8431 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
8432 bugfix on 0.2.3.11-alpha.
8433 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
8434 supported, and always fails. Some compilers warn about the
8435 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
8437 - Fix a compilation warning on some versions of GCC when building
8438 code that calls routerinfo_get_my_routerinfo() twice, assuming
8439 that the second call will succeed if the first one did. Fixes bug
8440 26269; bugfix on 0.2.8.2-alpha.
8441 - Refrain from compiling unit testing related object files when
8442 --disable-unittests is set to configure script. Fixes bug 24891;
8443 bugfix on 0.2.5.1-alpha.
8444 - The --enable-fatal-warnings flag now affects Rust code as well.
8445 Closes ticket 26245.
8446 - Avoid a compiler warning when casting the return value of
8447 smartlist_len() to double with DEBUG_SMARTLIST enabled. Fixes bug
8448 26283; bugfix on 0.2.4.10-alpha.
8450 o Minor bugfixes (compilation, windows):
8451 - Don't link or search for pthreads when building for Windows, even
8452 if we are using build environment (like mingw) that provides a
8453 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
8455 o Minor bugfixes (continuous integration):
8456 - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
8457 - Skip a pair of unreliable key generation tests on Windows, until
8458 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
8459 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
8461 o Minor bugfixes (control port):
8462 - Respond with more human-readable error messages to GETINFO exit-
8463 policy/* requests. Also, let controller know if an error is
8464 transient (response code 551) or not (response code 552). Fixes
8465 bug 25852; bugfix on 0.2.8.1-alpha.
8466 - Parse the "HSADDRESS=" parameter in HSPOST commands properly.
8467 Previously, it was misparsed and ignored. Fixes bug 26523; bugfix
8468 on 0.3.3.1-alpha. Patch by "akwizgran".
8469 - Make CIRC_BW event reflect the total of all data sent on a
8470 circuit, including padding and dropped cells. Also fix a mis-
8471 counting bug when STREAM_BW events were enabled. Fixes bug 25400;
8472 bugfix on 0.2.5.2-alpha.
8474 o Minor bugfixes (correctness, flow control):
8475 - Upon receiving a stream-level SENDME cell, verify that our window
8476 has not grown too large. Fixes bug 26214; bugfix on svn
8479 o Minor bugfixes (directory authority):
8480 - When voting for recommended versions, make sure that all of the
8481 versions are well-formed and parsable. Fixes bug 26485; bugfix
8484 o Minor bugfixes (directory client):
8485 - When unverified-consensus is verified, rename it to cached-
8486 consenus. Fixes bug 4187; bugfix on 0.2.0.3-alpha.
8487 - Fixed launching a certificate fetch always during the scheduled
8488 periodic consensus fetch by fetching only in those cases when
8489 consensus are waiting for certs. Fixes bug 24740; bugfix
8492 o Minor bugfixes (error reporting):
8493 - Improve tolerance for directory authorities with skewed clocks.
8494 Previously, an authority with a clock more than 60 seconds ahead
8495 could cause a client with a correct clock to warn that the
8496 client's clock was behind. Now the clocks of a majority of
8497 directory authorities have to be ahead of the client before this
8498 warning will occur. Fixes bug 25756; bugfix on 0.2.2.25-alpha.
8500 o Minor bugfixes (in-process restart):
8501 - Always call tor_free_all() when leaving tor_run_main(). When we
8502 did not, restarting tor in-process would cause an assertion
8503 failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
8505 o Minor bugfixes (Linux seccomp2 sandbox):
8506 - Fix a bug in our sandboxing rules for the openat() syscall.
8507 Previously, no openat() call would be permitted, which would break
8508 filesystem operations on recent glibc versions. Fixes bug 25440;
8509 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
8511 o Minor bugfixes (logging):
8512 - Improve the log message when connection initiators fail to
8513 authenticate direct connections to relays. Fixes bug 26927; bugfix
8516 o Minor bugfixes (onion services):
8517 - Silence a spurious compiler warning in
8518 rend_client_send_introduction(). Fixes bug 27463; bugfix
8520 - Fix bug that causes services to not ever rotate their descriptors
8521 if they were getting SIGHUPed often. Fixes bug 26932; bugfix
8523 - Recompute some consensus information after detecting a clock jump,
8524 or after transitioning from a non-live consensus to a live
8525 consensus. We do this to avoid having an outdated state, and
8526 miscalculating the index for next-generation onion services. Fixes
8527 bug 24977; bugfix on 0.3.2.1-alpha.
8529 o Minor bugfixes (portability):
8530 - Fix compilation of the unit tests on GNU/Hurd, which does not
8531 define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
8533 - Work around two different bugs in the OS X 10.10 and later SDKs
8534 that would prevent us from successfully targeting earlier versions
8535 of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
8536 - Do not align mmap length, as it is not required by POSIX, and the
8537 getpagesize function is deprecated. Fixes bug 25399; bugfix
8540 o Minor bugfixes (portability, FreeBSD):
8541 - In have_enough_mem_for_dircache(), the variable DIRCACHE_MIN_MEM_MB
8542 does not stringify on FreeBSD, so we switch to tor_asprintf().
8543 Fixes bug 20887; bugfix on 0.2.8.1-alpha. Patch by Neel Chauhan.
8545 o Minor bugfixes (relay statistics):
8546 - When a relay is collecting internal statistics about how many
8547 create cell requests it has seen of each type, accurately count
8548 the requests from relays that temporarily fall out of the
8549 consensus. (To be extra conservative, we were already ignoring
8550 requests from clients in our counts, and we continue ignoring them
8551 here.) Fixes bug 24910; bugfix on 0.2.4.17-rc.
8553 o Minor bugfixes (rust):
8554 - Backport test_rust.sh from master. Fixes bug 26497; bugfix
8556 - Protover parsing was accepting the presence of whitespace in
8557 version strings, which the C implementation would choke on, e.g.
8558 "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
8559 - Protover parsing was ignoring a 2nd hyphen and everything after
8560 it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
8562 - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
8563 $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
8564 - cd to ${abs_top_builddir}/src/rust before running cargo in
8565 src/test/test_rust.sh. This makes the working directory consistent
8566 between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
8568 o Minor bugfixes (single onion services, Tor2web):
8569 - Log a protocol warning when single onion services or Tor2web
8570 clients fail to authenticate direct connections to relays. Fixes
8571 bug 26924; bugfix on 0.2.9.1-alpha.
8573 o Minor bugfixes (test coverage tools):
8574 - Update our "cov-diff" script to handle output from the latest
8575 version of gcov, and to remove extraneous timestamp information
8576 from its output. Fixes bugs 26101 and 26102; bugfix
8579 o Minor bugfixes (testing):
8580 - Disable core dumps in test_bt.sh, to avoid failures in "make
8581 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
8582 - When testing workqueue event-cancellation, make sure that we
8583 actually cancel an event, and that cancel each event with equal
8584 probability. (It was previously possible, though extremely
8585 unlikely, for our event-canceling test not to cancel any events.)
8586 Fixes bug 26008; bugfix on 0.2.6.3-alpha.
8587 - Repeat part of the test in test_client_pick_intro() a number of
8588 times, to give it consistent coverage. Fixes bug 25996; bugfix
8590 - Remove randomness from the hs_common/responsible_hsdirs test, so
8591 that it always takes the same path through the function it tests.
8592 Fixes bug 25997; bugfix on 0.3.2.1-alpha.
8593 - Change the behavior of the "channel/outbound" test so that it
8594 never causes a 10-second rollover for the EWMA circuitmux code.
8595 Previously, this behavior would happen randomly, and result in
8596 fluctuating test coverage. Fixes bug 25994; bugfix
8598 - Use X509_new() to allocate certificates that will be freed later
8599 with X509_free(). Previously, some parts of the unit tests had
8600 used tor_malloc_zero(), which is incorrect, and which caused test
8601 failures on Windows when they were built with extra hardening.
8602 Fixes bugs 25943 and 25944; bugfix on 0.2.8.1-alpha. Patch by
8604 - While running the circuit_timeout test, fix the PRNG to a
8605 deterministic AES stream, so that the test coverage from this test
8606 will itself be deterministic. Fixes bug 25995; bugfix
8609 o Minor bugfixes (testing, bootstrap):
8610 - When calculating bootstrap progress, check exit policies and the
8611 exit flag. Previously, Tor would only check the exit flag, which
8612 caused race conditions in small and fast networks like chutney.
8613 Fixes bug 27236; bugfix on 0.2.6.3-alpha.
8615 o Minor bugfixes (testing, chutney):
8616 - When running make test-network-all, use the mixed+hs-v2 network.
8617 (A previous fix to chutney removed v3 onion services from the
8618 mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
8619 confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
8620 - Before running make test-network-all, delete old logs and test
8621 result files, to avoid spurious failures. Fixes bug 27295; bugfix
8624 o Minor bugfixes (testing, openssl compatibility):
8625 - Our "tortls/cert_matches_key" unit test no longer relies on
8626 OpenSSL internals. Previously, it relied on unsupported OpenSSL
8627 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
8628 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
8630 o Minor bugfixes (v3 onion services):
8631 - Stop sending ed25519 link specifiers in v3 onion service introduce
8632 cells and descriptors, when the rendezvous or introduction point
8633 doesn't support ed25519 link authentication. Fixes bug 26627;
8634 bugfix on 0.3.2.4-alpha.
8636 o Minor bugfixes (vanguards):
8637 - Allow the last hop in a vanguard circuit to be the same as our
8638 first, to prevent the adversary from influencing guard node choice
8639 by choice of last hop. Also prevent the creation of A - B - A
8640 paths, or A - A paths, which are forbidden by relays. Fixes bug
8641 25870; bugfix on 0.3.3.1-alpha.
8643 o Minor bugfixes (Windows, compilation):
8644 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
8645 27185; bugfix on 0.2.2.2-alpha.
8647 o Code simplification and refactoring:
8648 - Remove duplicate code in parse_{c,s}method_line and bootstrap
8649 their functionalities into a single function. Fixes bug 6236;
8650 bugfix on 0.2.3.6-alpha.
8651 - We remove the PortForwarding and PortForwardingHelper options,
8652 related functions, and the port_forwarding tests. These options
8653 were used by the now-deprecated Vidalia to help ordinary users
8654 become Tor relays or bridges. Closes ticket 25409. Patch by
8656 - In order to make the OR and dir checking function in router.c less
8657 confusing we renamed some functions and
8658 consider_testing_reachability() has been split into
8659 router_should_check_reachability() and
8660 router_do_reachability_checks(). Also we improved the documentation
8661 in some functions. Closes ticket 18918.
8662 - Initial work to isolate Libevent usage to a handful of modules in
8663 our codebase, to simplify our call structure, and so that we can
8664 more easily change event loops in the future if needed. Closes
8666 - Introduce a function to call getsockname() and return tor_addr_t,
8667 to save a little complexity throughout the codebase. Closes
8669 - Make hsdir_index in node_t a hsdir_index_t rather than a pointer
8670 as hsdir_index is always present. Also, we move hsdir_index_t into
8671 or.h. Closes ticket 23094. Patch by Neel Chauhan.
8672 - Merge functions used for describing nodes and suppress the
8673 functions that do not allocate memory for the output buffer
8674 string. NODE_DESC_BUF_LEN constant and format_node_description()
8675 function cannot be used externally from router.c module anymore.
8676 Closes ticket 25432. Patch by valentecaio.
8677 - Our main loop has been simplified so that all important operations
8678 happen inside events. Previously, some operations had to happen
8679 outside the event loop, to prevent infinite sequences of event
8680 activations. Closes ticket 25374.
8681 - Put a SHA1 public key digest in hs_service_intro_point_t, and use
8682 it in register_intro_circ() and service_intro_point_new(). This
8683 prevents the digest from being re-calculated each time. Closes
8684 ticket 23107. Patch by Neel Chauhan.
8685 - Refactor token-bucket implementations to use a common backend.
8686 Closes ticket 25766.
8687 - Remove extern declaration of stats_n_seconds_working variable from
8688 main, protecting its accesses with get_uptime() and reset_uptime()
8689 functions. Closes ticket 25081, patch by “valentecaio”.
8690 - Remove our previous logic for "cached gettimeofday()" -- our
8691 coarse monotonic timers are fast enough for this purpose, and far
8692 less error-prone. Implements part of ticket 25927.
8693 - Remove the return value for fascist_firewall_choose_address_base(),
8694 and sister functions such as fascist_firewall_choose_address_node()
8695 and fascist_firewall_choose_address_rs(). Also, while we're here,
8696 initialize the ap argument as leaving it uninitialized can pose a
8697 security hazard. Closes ticket 24734. Patch by Neel Chauhan.
8698 - Rename two fields of connection_t struct. timestamp_lastwritten is
8699 renamed to timestamp_last_write_allowed and timestamp_lastread is
8700 renamed to timestamp_last_read_allowed. Closes ticket 24714, patch
8702 - Since Tor requires C99, remove our old workaround code for libc
8703 implementations where free(NULL) doesn't work. Closes ticket 24484.
8704 - Use our standard rate-limiting code to deal with excessive
8705 libevent failures, rather than the hand-rolled logic we had
8706 before. Closes ticket 26016.
8707 - We remove the return value of node_get_prim_orport() and
8708 node_get_prim_dirport(), and introduce node_get_prim_orport() in
8709 node_ipv6_or_preferred() and node_ipv6_dir_preferred() in order to
8710 check for a null address. Closes ticket 23873. Patch by
8712 - We switch to should_record_bridge_info() in
8713 geoip_note_client_seen() and options_need_geoip_info() instead of
8714 accessing the configuration values directly. Fixes bug 25290;
8715 bugfix on 0.2.1.6-alpha. Patch by Neel Chauhan.
8717 o Deprecated features:
8718 - As we are not recommending 0.2.5 anymore, we require relays that
8719 once had an ed25519 key associated with their RSA key to always
8720 have that key, instead of allowing them to drop back to a version
8721 that didn't support ed25519. This means they need to use a new RSA
8722 key if they want to downgrade to an older version of tor without
8723 ed25519. Closes ticket 20522.
8726 - Directory authorities will no longer support voting according to
8727 any consensus method before consensus method 25. This keeps
8728 authorities compatible with all authorities running 0.2.9.8 and
8729 later, and does not break any clients or relays. Implements ticket
8730 24378 and proposal 290.
8731 - The PortForwarding and PortForwardingHelper features have been
8732 removed. The reasoning is, given that implementations of NAT
8733 traversal protocols within common consumer grade routers are
8734 frequently buggy, and that the target audience for a NAT punching
8735 feature is a perhaps less-technically-inclined relay operator,
8736 when the helper fails to setup traversal the problems are usually
8737 deep, ugly, and very router specific, making them horrendously
8738 impossible for technical support to reliable assist with, and thus
8739 resulting in frustration all around. Unfortunately, relay
8740 operators who would like to run relays behind NATs will need to
8741 become more familiar with the port forwarding configurations on
8742 their local router. Closes 25409.
8743 - The TestingEnableTbEmptyEvent option has been removed. It was used
8744 in testing simulations to measure how often connection buckets
8745 were emptied, in order to improve our scheduling, but it has not
8746 been actively used in years. Closes ticket 25760.
8747 - The old "round-robin" circuit multiplexer (circuitmux)
8748 implementation has been removed, along with a fairly large set of
8749 code that existed to support it. It has not been the default
8750 circuitmux since we introduced the "EWMA" circuitmux in 0.2.4.x,
8751 but it still required an unreasonable amount of memory and CPU.
8752 Closes ticket 25268.
8755 Changes in version 0.3.3.9 - 2018-07-13
8756 Tor 0.3.3.9 moves to a new bridge authority, meaning people running
8757 bridge relays should upgrade.
8759 o Directory authority changes:
8760 - The "Bifroest" bridge authority has been retired; the new bridge
8761 authority is "Serge", and it is operated by George from the
8762 TorBSD project. Closes ticket 26771.
8765 Changes in version 0.3.2.11 - 2018-07-13
8766 Tor 0.3.2.11 moves to a new bridge authority, meaning people running
8767 bridge relays should upgrade. We also take this opportunity to backport
8770 o Directory authority changes:
8771 - The "Bifroest" bridge authority has been retired; the new bridge
8772 authority is "Serge", and it is operated by George from the
8773 TorBSD project. Closes ticket 26771.
8775 o Directory authority changes (backport from 0.3.3.7):
8776 - Add an IPv6 address for the "dannenberg" directory authority.
8777 Closes ticket 26343.
8779 o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
8780 - When directory authorities read a zero-byte bandwidth file, they
8781 would previously log a warning with the contents of an
8782 uninitialised buffer. They now log a warning about the empty file
8783 instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
8785 o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
8786 - Correctly detect when onion services get disabled after HUP. Fixes
8787 bug 25761; bugfix on 0.3.2.1.
8789 o Minor features (sandbox, backport from 0.3.3.4-alpha):
8790 - Explicitly permit the poll() system call when the Linux
8791 seccomp2-based sandbox is enabled: apparently, some versions of
8792 libc use poll() when calling getpwnam(). Closes ticket 25313.
8794 o Minor feature (continuous integration, backport from 0.3.3.5-rc):
8795 - Update the Travis CI configuration to use the stable Rust channel,
8796 now that we have decided to require that. Closes ticket 25714.
8798 o Minor features (continuous integration, backport from 0.3.4.1-alpha):
8799 - Our .travis.yml configuration now includes support for testing the
8800 results of "make distcheck". (It's not uncommon for "make check"
8801 to pass but "make distcheck" to fail.) Closes ticket 25814.
8802 - Our Travis CI configuration now integrates with the Coveralls
8803 coverage analysis tool. Closes ticket 25818.
8805 o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
8806 - Add several checks to detect whether Tor relays are uploading
8807 their descriptors without specifying why they regenerated them.
8808 Diagnostic for ticket 25686.
8810 o Minor features (compilation, backport from 0.3.4.4-rc):
8811 - When building Tor, prefer to use Python 3 over Python 2, and more
8812 recent (contemplated) versions over older ones. Closes
8815 o Minor features (geoip):
8816 - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
8817 Country database. Closes ticket 26674.
8819 o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
8820 - Upon receiving a malformed connected cell, stop processing the
8821 cell immediately. Previously we would mark the connection for
8822 close, but continue processing the cell as if the connection were
8823 open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
8825 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
8826 - Allow the nanosleep() system call, which glibc uses to implement
8827 sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
8829 o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
8830 - When running the hs_ntor_ref.py test, make sure only to pass
8831 strings (rather than "bytes" objects) to the Python subprocess
8832 module. Python 3 on Windows seems to require this. Fixes bug
8833 26535; bugfix on 0.3.1.1-alpha.
8834 - When running the ntor_ref.py test, make sure only to pass strings
8835 (rather than "bytes" objects) to the Python subprocess module.
8836 Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
8839 o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
8840 - Work around a change in OpenSSL 1.1.1 where return values that
8841 would previously indicate "no password" now indicate an empty
8842 password. Without this workaround, Tor instances running with
8843 OpenSSL 1.1.1 would accept descriptors that other Tor instances
8844 would reject. Fixes bug 26116; bugfix on 0.2.5.16.
8846 o Minor bugfixes (documentation, backport from 0.3.3.5-rc):
8847 - Document that the PerConnBW{Rate,Burst} options will fall back to
8848 their corresponding consensus parameters only if those parameters
8849 are set. Previously we had claimed that these values would always
8850 be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
8852 o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
8853 - Fix a compilation warning on some versions of GCC when building
8854 code that calls routerinfo_get_my_routerinfo() twice, assuming
8855 that the second call will succeed if the first one did. Fixes bug
8856 26269; bugfix on 0.2.8.2-alpha.
8858 o Minor bugfixes (client, backport from 0.3.4.1-alpha):
8859 - Don't consider Tor running as a client if the ControlPort is open,
8860 but no actual client ports are open. Fixes bug 26062; bugfix
8863 o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
8864 - Prevent a possible out-of-bounds smartlist read in
8865 protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
8867 o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
8868 - Fix a very unlikely (impossible, we believe) null pointer
8869 dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
8870 Coverity; this is CID 1430932.
8872 o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
8873 - Fix a memory leak when a v3 onion service is configured and gets a
8874 SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
8875 - When parsing the descriptor signature, look for the token plus an
8876 extra white-space at the end. This is more correct but also will
8877 allow us to support new fields that might start with "signature".
8878 Fixes bug 26069; bugfix on 0.3.0.1-alpha.
8880 o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
8881 - Relays now correctly block attempts to re-extend to the previous
8882 relay by Ed25519 identity. Previously they would warn in this
8883 case, but not actually reject the attempt. Fixes bug 26158; bugfix
8886 o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
8887 - Avoid a crash when running with DirPort set but ORPort turned off.
8888 Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
8890 o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
8891 - Silence unused-const-variable warnings in zstd.h with some GCC
8892 versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
8894 o Minor bugfixes (testing, backport from 0.3.3.4-alpha):
8895 - Avoid intermittent test failures due to a test that had relied on
8896 onion service introduction point creation finishing within 5
8897 seconds of real clock time. Fixes bug 25450; bugfix
8900 o Minor bugfixes (compilation, backport from 0.3.3.4-alpha):
8901 - Fix a C99 compliance issue in our configuration script that caused
8902 compilation issues when compiling Tor with certain versions of
8903 xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
8905 o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
8906 - Fix a number of small memory leaks identified by coverity. Fixes
8907 bug 26467; bugfix on numerous Tor versions.
8909 o Code simplification and refactoring (backport from 0.3.3.5-rc):
8910 - Move the list of default directory authorities to its own file.
8911 Closes ticket 24854. Patch by "beastr0".
8914 Changes in version 0.2.9.16 - 2018-07-13
8915 Tor 0.2.9.16 moves to a new bridge authority, meaning people running
8916 bridge relays should upgrade. We also take this opportunity to backport
8919 o Directory authority changes:
8920 - The "Bifroest" bridge authority has been retired; the new bridge
8921 authority is "Serge", and it is operated by George from the
8922 TorBSD project. Closes ticket 26771.
8924 o Directory authority changes (backport from 0.3.3.7):
8925 - Add an IPv6 address for the "dannenberg" directory authority.
8926 Closes ticket 26343.
8928 o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
8929 - When directory authorities read a zero-byte bandwidth file, they
8930 would previously log a warning with the contents of an
8931 uninitialised buffer. They now log a warning about the empty file
8932 instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
8934 o Minor features (sandbox, backport from 0.3.3.4-alpha):
8935 - Explicitly permit the poll() system call when the Linux
8936 seccomp2-based sandbox is enabled: apparently, some versions of
8937 libc use poll() when calling getpwnam(). Closes ticket 25313.
8939 o Minor features (continuous integration, backport from 0.3.4.1-alpha):
8940 - Our .travis.yml configuration now includes support for testing the
8941 results of "make distcheck". (It's not uncommon for "make check"
8942 to pass but "make distcheck" to fail.) Closes ticket 25814.
8943 - Our Travis CI configuration now integrates with the Coveralls
8944 coverage analysis tool. Closes ticket 25818.
8946 o Minor features (compilation, backport from 0.3.4.4-rc):
8947 - When building Tor, prefer to use Python 3 over Python 2, and more
8948 recent (contemplated) versions over older ones. Closes
8951 o Minor features (geoip):
8952 - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
8953 Country database. Closes ticket 26674.
8955 o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
8956 - Upon receiving a malformed connected cell, stop processing the
8957 cell immediately. Previously we would mark the connection for
8958 close, but continue processing the cell as if the connection were
8959 open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
8961 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
8962 - Allow the nanosleep() system call, which glibc uses to implement
8963 sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
8965 o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
8966 - When running the ntor_ref.py test, make sure only to pass strings
8967 (rather than "bytes" objects) to the Python subprocess module.
8968 Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
8971 o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
8972 - Work around a change in OpenSSL 1.1.1 where return values that
8973 would previously indicate "no password" now indicate an empty
8974 password. Without this workaround, Tor instances running with
8975 OpenSSL 1.1.1 would accept descriptors that other Tor instances
8976 would reject. Fixes bug 26116; bugfix on 0.2.5.16.
8978 o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
8979 - Fix a compilation warning on some versions of GCC when building
8980 code that calls routerinfo_get_my_routerinfo() twice, assuming
8981 that the second call will succeed if the first one did. Fixes bug
8982 26269; bugfix on 0.2.8.2-alpha.
8984 o Minor bugfixes (client, backport from 0.3.4.1-alpha):
8985 - Don't consider Tor running as a client if the ControlPort is open,
8986 but no actual client ports are open. Fixes bug 26062; bugfix
8989 o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
8990 - Prevent a possible out-of-bounds smartlist read in
8991 protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
8993 o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
8994 - Fix a very unlikely (impossible, we believe) null pointer
8995 dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
8996 Coverity; this is CID 1430932.
8998 o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
8999 - Fix a number of small memory leaks identified by coverity. Fixes
9000 bug 26467; bugfix on numerous Tor versions.
9002 o Code simplification and refactoring (backport from 0.3.3.5-rc):
9003 - Move the list of default directory authorities to its own file.
9004 Closes ticket 24854. Patch by "beastr0".
9007 Changes in version 0.3.3.8 - 2018-07-09
9008 Tor 0.3.3.8 backports several changes from the 0.3.4.x series, including
9009 fixes for a memory leak affecting directory authorities.
9011 o Major bugfixes (directory authority, backport from 0.3.4.3-alpha):
9012 - Stop leaking memory on directory authorities when planning to
9013 vote. This bug was crashing authorities by exhausting their
9014 memory. Fixes bug 26435; bugfix on 0.3.3.6.
9016 o Major bugfixes (rust, testing, backport from 0.3.4.3-alpha):
9017 - Make sure that failing tests in Rust will actually cause the build
9018 to fail: previously, they were ignored. Fixes bug 26258; bugfix
9021 o Minor features (compilation, backport from 0.3.4.4-rc):
9022 - When building Tor, prefer to use Python 3 over Python 2, and more
9023 recent (contemplated) versions over older ones. Closes
9026 o Minor features (geoip):
9027 - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
9028 Country database. Closes ticket 26674.
9030 o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
9031 - Add several checks to detect whether Tor relays are uploading
9032 their descriptors without specifying why they regenerated them.
9033 Diagnostic for ticket 25686.
9035 o Minor bugfixes (circuit path selection, backport from 0.3.4.1-alpha):
9036 - Don't count path selection failures as circuit build failures.
9037 This change should eliminate cases where Tor blames its guard or
9038 the network for situations like insufficient microdescriptors
9039 and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
9042 o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
9043 - Fix a compilation warning on some versions of GCC when building
9044 code that calls routerinfo_get_my_routerinfo() twice, assuming
9045 that the second call will succeed if the first one did. Fixes bug
9046 26269; bugfix on 0.2.8.2-alpha.
9048 o Minor bugfixes (control port, backport from 0.3.4.4-rc):
9049 - Handle the HSADDRESS= argument to the HSPOST command properly.
9050 (Previously, this argument was misparsed and thus ignored.) Fixes
9051 bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
9053 o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
9054 - Fix a number of small memory leaks identified by coverity. Fixes
9055 bug 26467; bugfix on numerous Tor versions.
9057 o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
9058 - Relays now correctly block attempts to re-extend to the previous
9059 relay by Ed25519 identity. Previously they would warn in this
9060 case, but not actually reject the attempt. Fixes bug 26158; bugfix
9063 o Minor bugfixes (restart-in-process, backport from 0.3.4.1-alpha):
9064 - When shutting down, Tor now clears all the flags in the control.c
9065 module. This should prevent a bug where authentication cookies are
9066 not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
9068 o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
9069 - When running the hs_ntor_ref.py test, make sure only to pass
9070 strings (rather than "bytes" objects) to the Python subprocess
9071 module. Python 3 on Windows seems to require this. Fixes bug
9072 26535; bugfix on 0.3.1.1-alpha.
9073 - When running the ntor_ref.py test, make sure only to pass strings
9074 (rather than "bytes" objects) to the Python subprocess module.
9075 Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
9079 Changes in version 0.3.3.7 - 2018-06-12
9080 Tor 0.3.3.7 backports several changes from the 0.3.4.x series, including
9081 fixes for bugs affecting compatibility and stability.
9083 o Directory authority changes:
9084 - Add an IPv6 address for the "dannenberg" directory authority.
9085 Closes ticket 26343.
9087 o Minor features (geoip):
9088 - Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
9089 Country database. Closes ticket 26351.
9091 o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
9092 - Work around a change in OpenSSL 1.1.1 where return values that
9093 would previously indicate "no password" now indicate an empty
9094 password. Without this workaround, Tor instances running with
9095 OpenSSL 1.1.1 would accept descriptors that other Tor instances
9096 would reject. Fixes bug 26116; bugfix on 0.2.5.16.
9098 o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
9099 - Silence unused-const-variable warnings in zstd.h with some GCC
9100 versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
9102 o Minor bugfixes (controller, backport from 0.3.4.2-alpha):
9103 - Improve accuracy of the BUILDTIMEOUT_SET control port event's
9104 TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
9105 miscounting the total number of circuits for these field values.)
9106 Fixes bug 26121; bugfix on 0.3.3.1-alpha.
9108 o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
9109 - Prevent a possible out-of-bounds smartlist read in
9110 protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
9112 o Minor bugfixes (path selection, backport from 0.3.4.1-alpha):
9113 - Only select relays when they have the descriptors we prefer to use
9114 for them. This change fixes a bug where we could select a relay
9115 because it had _some_ descriptor, but reject it later with a
9116 nonfatal assertion error because it didn't have the exact one we
9117 wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
9120 Changes in version 0.3.3.6 - 2018-05-22
9121 Tor 0.3.3.6 is the first stable release in the 0.3.3 series. It
9122 backports several important fixes from the 0.3.4.1-alpha.
9124 The Tor 0.3.3 series includes controller support and other
9125 improvements for v3 onion services, official support for embedding Tor
9126 within other applications, and our first non-trivial module written in
9127 the Rust programming language. (Rust is still not enabled by default
9128 when building Tor.) And as usual, there are numerous other smaller
9129 bugfixes, features, and improvements.
9131 Below are the changes since 0.3.2.10. For a list of only the changes
9132 since 0.3.3.5-rc, see the ChangeLog file.
9134 o New system requirements:
9135 - When built with Rust, Tor now depends on version 0.2.39 of the
9136 libc crate. Closes tickets 25310 and 25664.
9138 o Major features (embedding):
9139 - There is now a documented stable API for programs that need to
9140 embed Tor. See tor_api.h for full documentation and known bugs.
9141 Closes ticket 23684.
9142 - Tor now has support for restarting in the same process.
9143 Controllers that run Tor using the "tor_api.h" interface can now
9144 restart Tor after Tor has exited. This support is incomplete,
9145 however: we fixed crash bugs that prevented it from working at
9146 all, but many bugs probably remain, including a possibility of
9147 security issues. Implements ticket 24581.
9149 o Major features (IPv6, directory documents):
9150 - Add consensus method 27, which adds IPv6 ORPorts to the microdesc
9151 consensus. This information makes it easier for IPv6 clients to
9152 bootstrap and choose reachable entry guards. Implements
9154 - Add consensus method 28, which removes IPv6 ORPorts from
9155 microdescriptors. Now that the consensus contains IPv6 ORPorts,
9156 they are redundant in microdescs. This change will be used by Tor
9157 clients on 0.2.8.x and later. (That is to say, with all Tor
9158 clients that have IPv6 bootstrap and guard support.) Implements
9160 - Expand the documentation for AuthDirHasIPv6Connectivity when it is
9161 set by different numbers of authorities. Fixes 23870
9164 o Major features (onion service v3, control port):
9165 - The control port now supports commands and events for v3 onion
9166 services. It is now possible to create ephemeral v3 services using
9167 ADD_ONION. Additionally, several events (HS_DESC, HS_DESC_CONTENT,
9168 CIRC and CIRC_MINOR) and commands (GETINFO, HSPOST, ADD_ONION and
9169 DEL_ONION) have been extended to support v3 onion services. Closes
9170 ticket 20699; implements proposal 284.
9172 o Major features (onion services):
9173 - Provide torrc options to pin the second and third hops of onion
9174 service circuits to a list of nodes. The option HSLayer2Guards
9175 pins the second hop, and the option HSLayer3Guards pins the third
9176 hop. These options are for use in conjunction with experiments
9177 with "vanguards" for preventing guard enumeration attacks. Closes
9179 - When v3 onion service clients send introduce cells, they now
9180 include the IPv6 address of the rendezvous point, if it has one.
9181 Current v3 onion services running 0.3.2 ignore IPv6 addresses, but
9182 in future Tor versions, IPv6-only v3 single onion services will be
9183 able to use IPv6 addresses to connect directly to the rendezvous
9184 point. Closes ticket 23577. Patch by Neel Chauhan.
9186 o Major features (relay):
9187 - Implement an option, ReducedExitPolicy, to allow an Tor exit relay
9188 operator to use a more reasonable ("reduced") exit policy, rather
9189 than the default one. If you want to run an exit node without
9190 thinking too hard about which ports to allow, this one is for you.
9191 Closes ticket 13605. Patch from Neel Chauhan.
9193 o Major features (rust, portability, experimental):
9194 - Tor now ships with an optional implementation of one of its
9195 smaller modules (protover.c) in the Rust programming language. To
9196 try it out, install a Rust build environment, and configure Tor
9197 with "--enable-rust --enable-cargo-online-mode". This should not
9198 cause any user-visible changes, but should help us gain more
9199 experience with Rust, and plan future Rust integration work.
9200 Implementation by Chelsea Komlo. Closes ticket 22840.
9202 o Major bugfixes (directory authorities, security, backport from 0.3.4.1-alpha):
9203 - When directory authorities read a zero-byte bandwidth file, they
9204 would previously log a warning with the contents of an
9205 uninitialised buffer. They now log a warning about the empty file
9206 instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
9208 o Major bugfixes (security, directory authority, denial-of-service):
9209 - Fix a bug that could have allowed an attacker to force a directory
9210 authority to use up all its RAM by passing it a maliciously
9211 crafted protocol versions string. Fixes bug 25517; bugfix on
9212 0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
9214 o Major bugfixes (crash, backport from 0.3.4.1-alpha):
9215 - Avoid a rare assertion failure in the circuit build timeout code
9216 if we fail to allow any circuits to actually complete. Fixes bug
9217 25733; bugfix on 0.2.2.2-alpha.
9219 o Major bugfixes (netflow padding):
9220 - Stop adding unneeded channel padding right after we finish
9221 flushing to a connection that has been trying to flush for many
9222 seconds. Instead, treat all partial or complete flushes as
9223 activity on the channel, which will defer the time until we need
9224 to add padding. This fix should resolve confusing and scary log
9225 messages like "Channel padding timeout scheduled 221453ms in the
9226 past." Fixes bug 22212; bugfix on 0.3.1.1-alpha.
9228 o Major bugfixes (networking):
9229 - Tor will no longer reject IPv6 address strings from Tor Browser
9230 when they are passed as hostnames in SOCKS5 requests. Fixes bug
9231 25036, bugfix on Tor 0.3.1.2.
9233 o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
9234 - Correctly detect when onion services get disabled after HUP. Fixes
9235 bug 25761; bugfix on 0.3.2.1.
9237 o Major bugfixes (performance, load balancing):
9238 - Directory authorities no longer vote in favor of the Guard flag
9239 for relays without directory support. Starting in Tor
9240 0.3.0.1-alpha, clients have been avoiding using such relays in the
9241 Guard position, leading to increasingly broken load balancing for
9242 the 5%-or-so of Guards that don't advertise directory support.
9243 Fixes bug 22310; bugfix on 0.3.0.6.
9245 o Major bugfixes (relay):
9246 - If we have failed to connect to a relay and received a connection
9247 refused, timeout, or similar error (at the TCP level), do not try
9248 that same address/port again for 60 seconds after the failure has
9249 occurred. Fixes bug 24767; bugfix on 0.0.6.
9251 o Major bugfixes (relay, denial of service, backport from 0.3.4.1-alpha):
9252 - Impose a limit on circuit cell queue size. The limit can be
9253 controlled by a consensus parameter. Fixes bug 25226; bugfix
9256 o Minor features (cleanup):
9257 - Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
9258 when it stops. Closes ticket 23271.
9260 o Minor features (compatibility, backport from 0.3.4.1-alpha):
9261 - Avoid some compilation warnings with recent versions of LibreSSL.
9262 Closes ticket 26006.
9264 o Minor features (config options):
9265 - Change the way the default value for MaxMemInQueues is calculated.
9266 We now use 40% of the hardware RAM if the system has 8 GB RAM or
9267 more. Otherwise we use the former value of 75%. Closes
9270 o Minor features (continuous integration):
9271 - Update the Travis CI configuration to use the stable Rust channel,
9272 now that we have decided to require that. Closes ticket 25714.
9274 o Minor features (continuous integration, backport from 0.3.4.1-alpha):
9275 - Our .travis.yml configuration now includes support for testing the
9276 results of "make distcheck". (It's not uncommon for "make check"
9277 to pass but "make distcheck" to fail.) Closes ticket 25814.
9278 - Our Travis CI configuration now integrates with the Coveralls
9279 coverage analysis tool. Closes ticket 25818.
9281 o Minor features (defensive programming):
9282 - Most of the functions in Tor that free objects have been replaced
9283 with macros that free the objects and set the corresponding
9284 pointers to NULL. This change should help prevent a large class of
9285 dangling pointer bugs. Closes ticket 24337.
9286 - Where possible, the tor_free() macro now only evaluates its input
9287 once. Part of ticket 24337.
9288 - Check that microdesc ed25519 ids are non-zero in
9289 node_get_ed25519_id() before returning them. Implements ticket
9290 24001, patch by "aruna1234".
9292 o Minor features (directory authority):
9293 - When directory authorities are unable to add signatures to a
9294 pending consensus, log the reason why. Closes ticket 24849.
9296 o Minor features (embedding):
9297 - Tor can now start with a preauthenticated control connection
9298 created by the process that launched it. This feature is meant for
9299 use by programs that want to launch and manage a Tor process
9300 without allowing other programs to manage it as well. For more
9301 information, see the __OwningControllerFD option documented in
9302 control-spec.txt. Closes ticket 23900.
9303 - On most errors that would cause Tor to exit, it now tries to
9304 return from the tor_main() function, rather than calling the
9305 system exit() function. Most users won't notice a difference here,
9306 but it should be significant for programs that run Tor inside a
9307 separate thread: they should now be able to survive Tor's exit
9308 conditions rather than having Tor shut down the entire process.
9309 Closes ticket 23848.
9310 - Applications that want to embed Tor can now tell Tor not to
9311 register any of its own POSIX signal handlers, using the
9312 __DisableSignalHandlers option. Closes ticket 24588.
9314 o Minor features (fallback directory list):
9315 - Avoid selecting fallbacks that change their IP addresses too
9316 often. Select more fallbacks by ignoring the Guard flag, and
9317 allowing lower cutoffs for the Running and V2Dir flags. Also allow
9318 a lower bandwidth, and a higher number of fallbacks per operator
9319 (5% of the list). Implements ticket 24785.
9320 - Update the fallback whitelist and blacklist based on opt-ins and
9321 relay changes. Closes tickets 22321, 24678, 22527, 24135,
9324 o Minor features (fallback directory mirror configuration):
9325 - Add a nickname to each fallback in a C comment. This makes it
9326 easier for operators to find their relays, and allows stem to use
9327 nicknames to identify fallbacks. Implements ticket 24600.
9328 - Add a type and version header to the fallback directory mirror
9329 file. Also add a delimiter to the end of each fallback entry. This
9330 helps external parsers like stem and Relay Search. Implements
9332 - Add an extrainfo cache flag for each fallback in a C comment. This
9333 allows stem to use fallbacks to fetch extra-info documents, rather
9334 than using authorities. Implements ticket 22759.
9335 - Add the generateFallbackDirLine.py script for automatically
9336 generating fallback directory mirror lines from relay fingerprints.
9337 No more typos! Add the lookupFallbackDirContact.py script for
9338 automatically looking up operator contact info from relay
9339 fingerprints. Implements ticket 24706, patch by teor and atagar.
9340 - Reject any fallback directory mirror that serves an expired
9341 consensus. Implements ticket 20942, patch by "minik".
9342 - Remove commas and equals signs from external string inputs to the
9343 fallback list. This avoids format confusion attacks. Implements
9345 - Remove the "weight=10" line from fallback directory mirror
9346 entries. Ticket 24681 will maintain the current fallback weights
9347 by changing Tor's default fallback weight to 10. Implements
9349 - Stop logging excessive information about fallback netblocks.
9350 Implements ticket 24791.
9352 o Minor features (forward-compatibility):
9353 - If a relay supports some link authentication protocol that we do
9354 not recognize, then include that relay's ed25519 key when telling
9355 other relays to extend to it. Previously, we treated future
9356 versions as if they were too old to support ed25519 link
9357 authentication. Closes ticket 20895.
9359 o Minor features (geoip):
9360 - Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
9361 database. Closes ticket 26104.
9363 o Minor features (heartbeat):
9364 - Add onion service information to our heartbeat logs, displaying
9365 stats about the activity of configured onion services. Closes
9368 o Minor features (instrumentation, development):
9369 - Add the MainloopStats option to allow developers to get
9370 instrumentation information from the main event loop via the
9371 heartbeat messages. We hope to use this to improve Tor's behavior
9372 when it's trying to sleep. Closes ticket 24605.
9374 o Minor features (IPv6):
9375 - Make IPv6-only clients wait for microdescs for relays, even if we
9376 were previously using descriptors (or were using them as a bridge)
9377 and have a cached descriptor for them. Implements ticket 23827.
9378 - When a consensus has IPv6 ORPorts, make IPv6-only clients use
9379 them, rather than waiting to download microdescriptors. Implements
9382 o Minor features (log messages):
9383 - Improve log message in the out-of-memory handler to include
9384 information about memory usage from the different compression
9385 backends. Closes ticket 25372.
9386 - Improve a warning message that happens when we fail to re-parse an
9387 old router because of an expired certificate. Closes ticket 20020.
9388 - Make the log more quantitative when we hit MaxMemInQueues
9389 threshold exposing some values. Closes ticket 24501.
9391 o Minor features (logging):
9392 - Clarify the log messages produced when getrandom() or a related
9393 entropy-generation mechanism gives an error. Closes ticket 25120.
9394 - Added support for the Android logging subsystem. Closes
9397 o Minor features (performance):
9398 - Support predictive circuit building for onion service circuits
9399 with multiple layers of guards. Closes ticket 23101.
9400 - Use stdatomic.h where available, rather than mutexes, to implement
9401 atomic_counter_t. Closes ticket 23953.
9403 o Minor features (performance, 32-bit):
9404 - Improve performance on 32-bit systems by avoiding 64-bit division
9405 when calculating the timestamp in milliseconds for channel padding
9406 computations. Implements ticket 24613.
9407 - Improve performance on 32-bit systems by avoiding 64-bit division
9408 when timestamping cells and buffer chunks for OOM calculations.
9409 Implements ticket 24374.
9411 o Minor features (performance, OSX, iOS):
9412 - Use the mach_approximate_time() function (when available) to
9413 implement coarse monotonic time. Having a coarse time function
9414 should avoid a large number of system calls, and improve
9415 performance slightly, especially under load. Closes ticket 24427.
9417 o Minor features (performance, windows):
9418 - Improve performance on Windows Vista and Windows 7 by adjusting
9419 TCP send window size according to the recommendation from
9420 SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
9423 o Minor features (sandbox):
9424 - Explicitly permit the poll() system call when the Linux
9425 seccomp2-based sandbox is enabled: apparently, some versions of
9426 libc use poll() when calling getpwnam(). Closes ticket 25313.
9428 o Minor features (storage, configuration):
9429 - Users can store cached directory documents somewhere other than
9430 the DataDirectory by using the CacheDirectory option. Similarly,
9431 the storage location for relay's keys can be overridden with the
9432 KeyDirectory option. Closes ticket 22703.
9434 o Minor features (testing):
9435 - Add a "make test-rust" target to run the rust tests only. Closes
9438 o Minor features (testing, debugging, embedding):
9439 - For development purposes, Tor now has a mode in which it runs for
9440 a few seconds, then stops, and starts again without exiting the
9441 process. This mode is meant to help us debug various issues with
9442 ticket 23847. To use this feature, compile with
9443 --enable-restart-debugging, and set the TOR_DEBUG_RESTART
9444 environment variable. This is expected to crash a lot, and is
9445 really meant for developers only. It will likely be removed in a
9446 future release. Implements ticket 24583.
9448 o Minor bugfixes (build, rust):
9449 - Fix output of autoconf checks to display success messages for Rust
9450 dependencies and a suitable rustc compiler version. Fixes bug
9451 24612; bugfix on 0.3.1.3-alpha.
9452 - Don't pass the --quiet option to cargo: it seems to suppress some
9453 errors, which is not what we want to do when building. Fixes bug
9454 24518; bugfix on 0.3.1.7.
9455 - Build correctly when building from outside Tor's source tree with
9456 the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
9459 o Minor bugfixes (C correctness):
9460 - Fix a very unlikely (impossible, we believe) null pointer
9461 dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
9462 Coverity; this is CID 1430932.
9464 o Minor bugfixes (channel, client):
9465 - Better identify client connection when reporting to the geoip
9466 client cache. Fixes bug 24904; bugfix on 0.3.1.7.
9468 o Minor bugfixes (circuit, cannibalization):
9469 - Don't cannibalize preemptively-built circuits if we no longer
9470 recognize their first hop. This situation can happen if our Guard
9471 relay went off the consensus after the circuit was created. Fixes
9472 bug 24469; bugfix on 0.0.6.
9474 o Minor bugfixes (client, backport from 0.3.4.1-alpha):
9475 - Don't consider Tor running as a client if the ControlPort is open,
9476 but no actual client ports are open. Fixes bug 26062; bugfix
9479 o Minor bugfixes (compilation):
9480 - Fix a C99 compliance issue in our configuration script that caused
9481 compilation issues when compiling Tor with certain versions of
9482 xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
9484 o Minor bugfixes (controller):
9485 - Restore the correct operation of the RESOLVE command, which had
9486 been broken since we added the ability to enable/disable DNS on
9487 specific listener ports. Fixes bug 25617; bugfix on 0.2.9.3-alpha.
9488 - Avoid a (nonfatal) assertion failure when extending a one-hop
9489 circuit from the controller to become a multihop circuit. Fixes
9490 bug 24903; bugfix on 0.2.5.2-alpha.
9492 o Minor bugfixes (correctness):
9493 - Remove a nonworking, unnecessary check to see whether a circuit
9494 hop's identity digest was set when the circuit failed. Fixes bug
9495 24927; bugfix on 0.2.4.4-alpha.
9497 o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
9498 - Upon receiving a malformed connected cell, stop processing the
9499 cell immediately. Previously we would mark the connection for
9500 close, but continue processing the cell as if the connection were
9501 open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
9503 o Minor bugfixes (directory authorities, IPv6):
9504 - When creating a routerstatus (vote) from a routerinfo (descriptor),
9505 set the IPv6 address to the unspecified IPv6 address, and
9506 explicitly initialize the port to zero. Fixes bug 24488; bugfix
9509 o Minor bugfixes (documentation):
9510 - Document that the PerConnBW{Rate,Burst} options will fall back to
9511 their corresponding consensus parameters only if those parameters
9512 are set. Previously we had claimed that these values would always
9513 be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
9515 o Minor bugfixes (documentation, backport from 0.3.4.1-alpha):
9516 - Stop saying in the manual that clients cache ipv4 dns answers from
9517 exit relays. We haven't used them since 0.2.6.3-alpha, and in
9518 ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
9519 we forgot to say so in the man page. Fixes bug 26052; bugfix
9522 o Minor bugfixes (exit relay DNS retries):
9523 - Re-attempt timed-out DNS queries 3 times before failure, since our
9524 timeout is 5 seconds for them, but clients wait 10-15. Also allow
9525 slightly more timeouts per resolver when an exit has multiple
9526 resolvers configured. Fixes bug 21394; bugfix on 0.3.1.9.
9528 o Minor bugfixes (fallback directory mirrors):
9529 - Make updateFallbackDirs.py search harder for python. (Some OSs
9530 don't put it in /usr/bin.) Fixes bug 24708; bugfix
9533 o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
9534 - When hibernating, close connections normally and allow them to
9535 flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
9537 - Do not attempt to launch self-reachability tests when entering
9538 hibernation. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
9539 - Resolve several bugs related to descriptor fetching on bridge
9540 clients with bandwidth accounting enabled. (This combination is
9541 not recommended!) Fixes a case of bug 12062; bugfix
9543 - When hibernating, do not attempt to launch DNS checks. Fixes a
9544 case of bug 12062; bugfix on 0.1.2.2-alpha.
9545 - When hibernating, do not try to upload or download descriptors.
9546 Fixes a case of bug 12062; bugfix on 0.0.9pre5.
9548 o Minor bugfixes (IPv6, bridges):
9549 - Tor now always sets IPv6 preferences for bridges. Fixes bug 24573;
9550 bugfix on 0.2.8.2-alpha.
9551 - Tor now sets IPv6 address in the routerstatus as well as in the
9552 router descriptors when updating addresses for a bridge. Closes
9553 ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
9555 o Minor bugfixes (Linux seccomp2 sandbox):
9556 - When running with the sandbox enabled, reload configuration files
9557 correctly even when %include was used. Previously we would crash.
9558 Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
9560 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
9561 - Allow the nanosleep() system call, which glibc uses to implement
9562 sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
9564 o Minor bugfixes (logging):
9565 - Fix a (mostly harmless) race condition when invoking
9566 LOG_PROTOCOL_WARN message from a subthread while the torrc options
9567 are changing. Fixes bug 23954; bugfix on 0.1.1.9-alpha.
9569 o Minor bugfixes (man page, SocksPort):
9570 - Remove dead code from the old "SocksSocket" option, and rename
9571 SocksSocketsGroupWritable to UnixSocksGroupWritable. The old
9572 option still works, but is deprecated. Fixes bug 24343; bugfix
9575 o Minor bugfixes (memory leaks):
9576 - Avoid possible at-exit memory leaks related to use of Libevent's
9577 event_base_once() function. (This function tends to leak memory if
9578 the event_base is closed before the event fires.) Fixes bug 24584;
9579 bugfix on 0.2.8.1-alpha.
9580 - Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
9583 o Minor bugfixes (network IPv6 test):
9584 - Tor's test scripts now check if "ping -6 ::1" works when the user
9585 runs "make test-network-all". Fixes bug 24677; bugfix on
9586 0.2.9.3-alpha. Patch by "ffmancera".
9588 o Minor bugfixes (networking):
9589 - string_is_valid_hostname() will not consider IP strings to be
9590 valid hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.
9592 o Minor bugfixes (onion service v3):
9593 - Avoid an assertion failure when the next onion service descriptor
9594 rotation type is out of sync with the consensus's valid-after
9595 time. Instead, log a warning message with extra information, so we
9596 can better hunt down the cause of this assertion. Fixes bug 25306;
9597 bugfix on 0.3.2.1-alpha.
9599 o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
9600 - Fix a memory leak when a v3 onion service is configured and gets a
9601 SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
9602 - When parsing the descriptor signature, look for the token plus an
9603 extra white-space at the end. This is more correct but also will
9604 allow us to support new fields that might start with "signature".
9605 Fixes bug 26069; bugfix on 0.3.0.1-alpha.
9607 o Minor bugfixes (onion services):
9608 - If we are configured to offer a single onion service, don't log
9609 long-term established one hop rendezvous points in the heartbeat.
9610 Fixes bug 25116; bugfix on 0.2.9.6-rc.
9612 o Minor bugfixes (performance):
9613 - Reduce the number of circuits that will be opened at once during
9614 the circuit build timeout phase. This is done by increasing the
9615 idle timeout to 3 minutes, and lowering the maximum number of
9616 concurrent learning circuits to 10. Fixes bug 24769; bugfix
9618 - Avoid calling protocol_list_supports_protocol() from inside tight
9619 loops when running with cached routerinfo_t objects. Instead,
9620 summarize the relevant protocols as flags in the routerinfo_t, as
9621 we do for routerstatus_t objects. This change simplifies our code
9622 a little, and saves a large amount of short-term memory allocation
9623 operations. Fixes bug 25008; bugfix on 0.2.9.4-alpha.
9625 o Minor bugfixes (performance, timeouts):
9626 - Consider circuits for timeout as soon as they complete a hop. This
9627 is more accurate than applying the timeout in
9628 circuit_expire_building() because that function is only called
9629 once per second, which is now too slow for typical timeouts on the
9630 current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
9631 - Use onion service circuits (and other circuits longer than 3 hops)
9632 to calculate a circuit build timeout. Previously, Tor only
9633 calculated its build timeout based on circuits that planned to be
9634 exactly 3 hops long. With this change, we include measurements
9635 from all circuits at the point where they complete their third
9636 hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
9638 o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
9639 - Avoid a crash when running with DirPort set but ORPort turned off.
9640 Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
9642 o Minor bugfixes (Rust FFI):
9643 - Fix a minor memory leak which would happen whenever the C code
9644 would call the Rust implementation of
9645 protover_get_supported_protocols(). This was due to the C version
9646 returning a static string, whereas the Rust version newly allocated
9647 a CString to pass across the FFI boundary. Consequently, the C
9648 code was not expecting to need to free() what it was given. Fixes
9649 bug 25127; bugfix on 0.3.2.1-alpha.
9651 o Minor bugfixes (spelling):
9652 - Use the "misspell" tool to detect and fix typos throughout the
9653 source code. Fixes bug 23650; bugfix on various versions of Tor.
9654 Patch from Deepesh Pathak.
9656 o Minor bugfixes (testing):
9657 - Avoid intermittent test failures due to a test that had relied on
9658 onion service introduction point creation finishing within 5
9659 seconds of real clock time. Fixes bug 25450; bugfix
9661 - Give out Exit flags in bootstrapping networks. Fixes bug 24137;
9662 bugfix on 0.2.3.1-alpha.
9664 o Minor bugfixes (unit test, monotonic time):
9665 - Increase a constant (1msec to 10msec) in the monotonic time test
9666 that makes sure the nsec/usec/msec times read are synchronized.
9667 This change was needed to accommodate slow systems like armel or
9668 when the clock_gettime() is not a VDSO on the running kernel.
9669 Fixes bug 25113; bugfix on 0.2.9.1.
9671 o Code simplification and refactoring:
9672 - Move the list of default directory authorities to its own file.
9673 Closes ticket 24854. Patch by "beastr0".
9674 - Remove the old (deterministic) directory retry logic entirely:
9675 We've used exponential backoff exclusively for some time. Closes
9677 - Remove the unused nodelist_recompute_all_hsdir_indices(). Closes
9679 - Remove a series of counters used to track circuit extend attempts
9680 and connection status but that in reality we aren't using for
9681 anything other than stats logged by a SIGUSR1 signal. Closes
9683 - Remove /usr/athena from search path in configure.ac. Closes
9685 - Remove duplicate code in node_has_curve25519_onion_key() and
9686 node_get_curve25519_onion_key(), and add a check for a zero
9687 microdesc curve25519 onion key. Closes ticket 23966, patch by
9688 "aruna1234" and teor.
9689 - Rewrite channel_rsa_id_group_set_badness to reduce temporary
9690 memory allocations with large numbers of OR connections (e.g.
9691 relays). Closes ticket 24119.
9692 - Separate the function that deletes ephemeral files when Tor
9694 - Small changes to Tor's buf_t API to make it suitable for use as a
9695 general-purpose safe string constructor. Closes ticket 22342.
9696 - Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
9697 avoid source code identifier confusion. Closes ticket 24467.
9698 - The tor_git_revision[] constant no longer needs to be redeclared
9699 by everything that links against the rest of Tor. Done as part of
9700 ticket 23845, to simplify our external API.
9701 - We make extend_info_from_node() use node_get_curve25519_onion_key()
9702 introduced in ticket 23577 to access the curve25519 public keys
9703 rather than accessing it directly. Closes ticket 23760. Patch by
9705 - Add a function to log channels' scheduler state changes to aid
9706 debugging efforts. Closes ticket 24531.
9709 - Improved the documentation of AccountingStart parameter. Closes
9711 - Update the documentation for "Log" to include the current list of
9712 logging domains. Closes ticket 25378.
9713 - Add documentation on how to build tor with Rust dependencies
9714 without having to be online. Closes ticket 22907; bugfix
9716 - Clarify the behavior of RelayBandwidth{Rate,Burst} with client
9717 traffic. Closes ticket 24318.
9718 - Document that OutboundBindAddress doesn't apply to DNS requests.
9719 Closes ticket 22145. Patch from Aruna Maurya.
9721 o Code simplification and refactoring (channels):
9722 - Remove the incoming and outgoing channel queues. These were never
9723 used, but still took up a step in our fast path.
9724 - The majority of the channel unit tests have been rewritten and the
9725 code coverage has now been raised to 83.6% for channel.c. Closes
9727 - Remove other dead code from the channel subsystem: All together,
9728 this cleanup has removed more than 1500 lines of code overall and
9729 adding very little except for unit test.
9731 o Code simplification and refactoring (circuit rendezvous):
9732 - Split the client-side rendezvous circuit lookup into two
9733 functions: one that returns only established circuits and another
9734 that returns all kinds of circuits. Closes ticket 23459.
9736 o Code simplification and refactoring (controller):
9737 - Make most of the variables in networkstatus_getinfo_by_purpose()
9738 const. Implements ticket 24489.
9740 o Documentation (backport from 0.3.4.1-alpha):
9741 - Correct an IPv6 error in the documentation for ExitPolicy. Closes
9742 ticket 25857. Patch from "CTassisF".
9744 o Documentation (man page):
9745 - The HiddenServiceVersion torrc option accepts only one number:
9746 either version 2 or 3. Closes ticket 25026; bugfix
9749 o Documentation (manpage, denial of service):
9750 - Provide more detail about the denial-of-service options, by
9751 listing each mitigation and explaining how they relate. Closes
9755 Changes in version 0.3.1.10 - 2018-03-03
9756 Tor 0.3.1.10 backports a number of bugfixes, including important fixes for
9759 It includes an important security fix for a remote crash attack
9760 against directory authorities, tracked as TROVE-2018-001.
9762 This release also backports our new system for improved resistance to
9763 denial-of-service attacks against relays.
9765 This release also fixes several minor bugs and annoyances from
9768 All directory authorities should upgrade to one of the versions
9769 released today. Relays running 0.3.1.x may wish to update to one of
9770 the versions released today, for the DoS mitigations.
9772 Please note: according to our release calendar, Tor 0.3.1 will no
9773 longer be supported after 1 July 2018. If you will be running Tor
9774 after that date, you should make sure to plan to upgrade to the latest
9775 stable version, or downgrade to 0.2.9 (which will receive long-term
9778 o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
9779 - Fix a protocol-list handling bug that could be used to remotely crash
9780 directory authorities with a null-pointer exception. Fixes bug 25074;
9781 bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
9784 o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
9785 - Give relays some defenses against the recent network overload. We
9786 start with three defenses (default parameters in parentheses).
9787 First: if a single client address makes too many concurrent
9788 connections (>100), hang up on further connections. Second: if a
9789 single client address makes circuits too quickly (more than 3 per
9790 second, with an allowed burst of 90) while also having too many
9791 connections open (3), refuse new create cells for the next while
9792 (1-2 hours). Third: if a client asks to establish a rendezvous
9793 point to you directly, ignore the request. These defenses can be
9794 manually controlled by new torrc options, but relays will also
9795 take guidance from consensus parameters, so there's no need to
9796 configure anything manually. Implements ticket 24902.
9798 o Minor features (linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
9799 - Update the sandbox rules so that they should now work correctly
9800 with Glibc 2.26. Closes ticket 24315.
9802 o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
9803 - Fix an "off by 2" error in counting rendezvous failures on the
9804 onion service side. While we thought we would stop the rendezvous
9805 attempt after one failed circuit, we were actually making three
9806 circuit attempts before giving up. Now switch to a default of 2,
9807 and allow the consensus parameter "hs_service_max_rdv_failures" to
9808 override. Fixes bug 24895; bugfix on 0.0.6.
9810 o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
9811 - Add Link protocol version 5 to the supported protocols list. Fixes
9812 bug 25070; bugfix on 0.3.1.1-alpha.
9814 o Major bugfixes (relay, backport from 0.3.3.1-alpha):
9815 - Fix a set of false positives where relays would consider
9816 connections to other relays as being client-only connections (and
9817 thus e.g. deserving different link padding schemes) if those
9818 relays fell out of the consensus briefly. Now we look only at the
9819 initial handshake and whether the connection authenticated as a
9820 relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
9822 o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
9823 - Make our OOM handler aware of the geoip client history cache so it
9824 doesn't fill up the memory. This check is important for IPv6 and
9825 our DoS mitigation subsystem. Closes ticket 25122.
9827 o Minor feature (relay statistics, backport from 0.3.2.6-alpha):
9828 - Change relay bandwidth reporting stats interval from 4 hours to 24
9829 hours in order to reduce the efficiency of guard discovery
9830 attacks. Fixes ticket 23856.
9832 o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
9833 - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
9834 Previous versions of Tor would not have worked with OpenSSL 1.1.1,
9835 since they neither disabled TLS 1.3 nor enabled any of the
9836 ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
9837 Closes ticket 24978.
9839 o Minor features (fallback directory mirrors, backport from 0.3.2.9):
9840 - The fallback directory list has been re-generated based on the
9841 current status of the network. Tor uses fallback directories to
9842 bootstrap when it doesn't yet have up-to-date directory
9843 information. Closes ticket 24801.
9844 - Make the default DirAuthorityFallbackRate 0.1, so that clients
9845 prefer to bootstrap from fallback directory mirrors. This is a
9846 follow-up to 24679, which removed weights from the default
9847 fallbacks. Implements ticket 24681.
9849 o Minor features (geoip):
9850 - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
9853 o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
9854 - Use the actual observed address of an incoming relay connection,
9855 not the canonical address of the relay from its descriptor, when
9856 making decisions about how to handle the incoming connection.
9857 Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
9859 o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
9860 - Directory authorities, when refusing a descriptor from a rejected
9861 relay, now explicitly tell the relay (in its logs) to set a valid
9862 ContactInfo address and contact the bad-relays@ mailing list.
9863 Fixes bug 25170; bugfix on 0.2.9.1.
9865 o Minor bugfixes (address selection, backport from 0.3.2.9):
9866 - When the fascist_firewall_choose_address_ functions don't find a
9867 reachable address, set the returned address to the null address
9868 and port. This is a precautionary measure, because some callers do
9869 not check the return value. Fixes bug 24736; bugfix
9872 o Major bugfixes (bootstrapping, backport from 0.3.2.5-alpha):
9873 - Fetch descriptors aggressively whenever we lack enough to build
9874 circuits, regardless of how many descriptors we are missing.
9875 Previously, we would delay launching the fetch when we had fewer
9876 than 15 missing descriptors, even if some of those descriptors
9877 were blocking circuits from building. Fixes bug 23985; bugfix on
9878 0.1.1.11-alpha. The effects of this bug became worse in
9879 0.3.0.3-alpha, when we began treating missing descriptors from our
9880 primary guards as a reason to delay circuits.
9881 - Don't try fetching microdescriptors from relays that have failed
9882 to deliver them in the past. Fixes bug 23817; bugfix
9885 o Minor bugfixes (compilation, backport from 0.3.2.7-rc):
9886 - Fix a signed/unsigned comparison warning introduced by our fix to
9887 TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
9889 o Minor bugfixes (control port, linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
9890 - Avoid a crash when attempting to use the seccomp2 sandbox together
9891 with the OwningControllerProcess feature. Fixes bug 24198; bugfix
9894 o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
9895 - Fix a possible crash on malformed consensus. If a consensus had
9896 contained an unparseable protocol line, it could have made clients
9897 and relays crash with a null-pointer exception. To exploit this
9898 issue, however, an attacker would need to be able to subvert the
9899 directory authority system. Fixes bug 25251; bugfix on
9900 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
9902 o Minor bugfixes (directory cache, backport from 0.3.2.5-alpha):
9903 - Recover better from empty or corrupt files in the consensus cache
9904 directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
9905 - When a consensus diff calculation is only partially successful,
9906 only record the successful parts as having succeeded. Partial
9907 success can happen if (for example) one compression method fails
9908 but the others succeed. Previously we misrecorded all the
9909 calculations as having succeeded, which would later cause a
9910 nonfatal assertion failure. Fixes bug 24086; bugfix
9913 o Minor bugfixes (entry guards, backport from 0.3.2.3-alpha):
9914 - Tor now updates its guard state when it reads a consensus
9915 regardless of whether it's missing descriptors. That makes tor use
9916 its primary guards to fetch descriptors in some edge cases where
9917 it would previously have used fallback directories. Fixes bug
9918 23862; bugfix on 0.3.0.1-alpha.
9920 o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
9921 - Don't treat inability to store a cached consensus object as a bug:
9922 it can happen normally when we are out of disk space. Fixes bug
9923 24859; bugfix on 0.3.1.1-alpha.
9925 o Minor bugfixes (memory usage, backport from 0.3.2.8-rc):
9926 - When queuing DESTROY cells on a channel, only queue the circuit-id
9927 and reason fields: not the entire 514-byte cell. This fix should
9928 help mitigate any bugs or attacks that fill up these queues, and
9929 free more RAM for other uses. Fixes bug 24666; bugfix
9932 o Minor bugfixes (network layer, backport from 0.3.2.5-alpha):
9933 - When closing a connection via close_connection_immediately(), we
9934 mark it as "not blocked on bandwidth", to prevent later calls from
9935 trying to unblock it, and give it permission to read. This fixes a
9936 backtrace warning that can happen on relays under various
9937 circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
9939 o Minor bugfixes (path selection, backport from 0.3.2.4-alpha):
9940 - When selecting relays by bandwidth, avoid a rounding error that
9941 could sometimes cause load to be imbalanced incorrectly.
9942 Previously, we would always round upwards; now, we round towards
9943 the nearest integer. This had the biggest effect when a relay's
9944 weight adjustments should have given it weight 0, but it got
9945 weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
9946 - When calculating the fraction of nodes that have descriptors, and
9947 all nodes in the network have zero bandwidths, count the number of
9948 nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
9949 - Actually log the total bandwidth in compute_weighted_bandwidths().
9950 Fixes bug 24170; bugfix on 0.2.4.3-alpha.
9952 o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
9953 - Improve the performance of our consensus-diff application code
9954 when Tor is built with the --enable-fragile-hardening option set.
9955 Fixes bug 24826; bugfix on 0.3.1.1-alpha.
9957 o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
9958 - Don't exit the Tor process if setrlimit() fails to change the file
9959 limit (which can happen sometimes on some versions of OSX). Fixes
9960 bug 21074; bugfix on 0.0.9pre5.
9962 o Minor bugfixes (portability, msvc, backport from 0.3.2.9):
9963 - Fix a bug in the bit-counting parts of our timing-wheel code on
9964 MSVC. (Note that MSVC is still not a supported build platform, due
9965 to cyptographic timing channel risks.) Fixes bug 24633; bugfix
9968 o Minor bugfixes (relay, partial backport):
9969 - Make the internal channel_is_client() function look at what sort
9970 of connection handshake the other side used, rather than whether
9971 the other side ever sent a create_fast cell to us. Backports part
9972 of the fixes from bugs 22805 and 24898.
9974 o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
9975 - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
9977 - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
9978 bugfix on 0.2.9.4-alpha.
9980 o Code simplification and refactoring (backport from 0.3.3.3-alpha):
9981 - Update the "rust dependencies" submodule to be a project-level
9982 repository, rather than a user repository. Closes ticket 25323.
9985 Changes in version 0.2.9.15 - 2018-03-03
9986 Tor 0.2.9.15 backports important security and stability bugfixes from
9989 It includes an important security fix for a remote crash attack
9990 against directory authorities, tracked as TROVE-2018-001.
9992 This release also backports our new system for improved resistance to
9993 denial-of-service attacks against relays.
9995 This release also fixes several minor bugs and annoyances from
9998 All directory authorities should upgrade to one of the versions
9999 released today. Relays running 0.2.9.x may wish to update to one of
10000 the versions released today, for the DoS mitigations.
10002 o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
10003 - Fix a protocol-list handling bug that could be used to remotely crash
10004 directory authorities with a null-pointer exception. Fixes bug 25074;
10005 bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
10008 o Major features (denial-of-service mitigation):
10009 - Give relays some defenses against the recent network overload. We
10010 start with three defenses (default parameters in parentheses).
10011 First: if a single client address makes too many concurrent
10012 connections (>100), hang up on further connections. Second: if a
10013 single client address makes circuits too quickly (more than 3 per
10014 second, with an allowed burst of 90) while also having too many
10015 connections open (3), refuse new create cells for the next while
10016 (1-2 hours). Third: if a client asks to establish a rendezvous
10017 point to you directly, ignore the request. These defenses can be
10018 manually controlled by new torrc options, but relays will also
10019 take guidance from consensus parameters, so there's no need to
10020 configure anything manually. Implements ticket 24902.
10022 o Major bugfixes (bootstrapping):
10023 - Fetch descriptors aggressively whenever we lack enough to build
10024 circuits, regardless of how many descriptors we are missing.
10025 Previously, we would delay launching the fetch when we had fewer
10026 than 15 missing descriptors, even if some of those descriptors
10027 were blocking circuits from building. Fixes bug 23985; bugfix on
10028 0.1.1.11-alpha. The effects of this bug became worse in
10029 0.3.0.3-alpha, when we began treating missing descriptors from our
10030 primary guards as a reason to delay circuits.
10032 o Major bugfixes (onion services, retry behavior):
10033 - Fix an "off by 2" error in counting rendezvous failures on the
10034 onion service side. While we thought we would stop the rendezvous
10035 attempt after one failed circuit, we were actually making three
10036 circuit attempts before giving up. Now switch to a default of 2,
10037 and allow the consensus parameter "hs_service_max_rdv_failures" to
10038 override. Fixes bug 24895; bugfix on 0.0.6.
10040 o Minor feature (relay statistics):
10041 - Change relay bandwidth reporting stats interval from 4 hours to 24
10042 hours in order to reduce the efficiency of guard discovery
10043 attacks. Fixes ticket 23856.
10045 o Minor features (compatibility, OpenSSL):
10046 - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
10047 Previous versions of Tor would not have worked with OpenSSL 1.1.1,
10048 since they neither disabled TLS 1.3 nor enabled any of the
10049 ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
10050 Closes ticket 24978.
10052 o Minor features (denial-of-service avoidance):
10053 - Make our OOM handler aware of the geoip client history cache so it
10054 doesn't fill up the memory. This check is important for IPv6 and
10055 our DoS mitigation subsystem. Closes ticket 25122.
10057 o Minor features (fallback directory mirrors):
10058 - The fallback directory list has been re-generated based on the
10059 current status of the network. Tor uses fallback directories to
10060 bootstrap when it doesn't yet have up-to-date directory
10061 information. Closes ticket 24801.
10062 - Make the default DirAuthorityFallbackRate 0.1, so that clients
10063 prefer to bootstrap from fallback directory mirrors. This is a
10064 follow-up to 24679, which removed weights from the default
10065 fallbacks. Implements ticket 24681.
10067 o Minor features (geoip):
10068 - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
10071 o Minor features (linux seccomp2 sandbox):
10072 - Update the sandbox rules so that they should now work correctly
10073 with Glibc 2.26. Closes ticket 24315.
10075 o Minor bugfix (channel connection):
10076 - Use the actual observed address of an incoming relay connection,
10077 not the canonical address of the relay from its descriptor, when
10078 making decisions about how to handle the incoming connection.
10079 Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
10081 o Minor bugfix (directory authority):
10082 - Directory authorities, when refusing a descriptor from a rejected
10083 relay, now explicitly tell the relay (in its logs) to set a valid
10084 ContactInfo address and contact the bad-relays@ mailing list.
10085 Fixes bug 25170; bugfix on 0.2.9.1.
10087 o Minor bugfixes (address selection):
10088 - When the fascist_firewall_choose_address_ functions don't find a
10089 reachable address, set the returned address to the null address
10090 and port. This is a precautionary measure, because some callers do
10091 not check the return value. Fixes bug 24736; bugfix
10094 o Minor bugfixes (compilation):
10095 - Fix a signed/unsigned comparison warning introduced by our fix to
10096 TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
10098 o Minor bugfixes (control port, linux seccomp2 sandbox):
10099 - Avoid a crash when attempting to use the seccomp2 sandbox together
10100 with the OwningControllerProcess feature. Fixes bug 24198; bugfix
10103 o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
10104 - Fix a possible crash on malformed consensus. If a consensus had
10105 contained an unparseable protocol line, it could have made clients
10106 and relays crash with a null-pointer exception. To exploit this
10107 issue, however, an attacker would need to be able to subvert the
10108 directory authority system. Fixes bug 25251; bugfix on
10109 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
10111 o Minor bugfixes (memory usage):
10112 - When queuing DESTROY cells on a channel, only queue the circuit-id
10113 and reason fields: not the entire 514-byte cell. This fix should
10114 help mitigate any bugs or attacks that fill up these queues, and
10115 free more RAM for other uses. Fixes bug 24666; bugfix
10118 o Minor bugfixes (network layer):
10119 - When closing a connection via close_connection_immediately(), we
10120 mark it as "not blocked on bandwidth", to prevent later calls from
10121 trying to unblock it, and give it permission to read. This fixes a
10122 backtrace warning that can happen on relays under various
10123 circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
10125 o Minor bugfixes (OSX):
10126 - Don't exit the Tor process if setrlimit() fails to change the file
10127 limit (which can happen sometimes on some versions of OSX). Fixes
10128 bug 21074; bugfix on 0.0.9pre5.
10130 o Minor bugfixes (path selection):
10131 - When selecting relays by bandwidth, avoid a rounding error that
10132 could sometimes cause load to be imbalanced incorrectly.
10133 Previously, we would always round upwards; now, we round towards
10134 the nearest integer. This had the biggest effect when a relay's
10135 weight adjustments should have given it weight 0, but it got
10136 weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
10137 - When calculating the fraction of nodes that have descriptors, and
10138 all nodes in the network have zero bandwidths, count the number of
10139 nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
10140 - Actually log the total bandwidth in compute_weighted_bandwidths().
10141 Fixes bug 24170; bugfix on 0.2.4.3-alpha.
10143 o Minor bugfixes (portability, msvc):
10144 - Fix a bug in the bit-counting parts of our timing-wheel code on
10145 MSVC. (Note that MSVC is still not a supported build platform, due
10146 to cryptographic timing channel risks.) Fixes bug 24633; bugfix
10149 o Minor bugfixes (relay):
10150 - Make the internal channel_is_client() function look at what sort
10151 of connection handshake the other side used, rather than whether
10152 the other side ever sent a create_fast cell to us. Backports part
10153 of the fixes from bugs 22805 and 24898.
10155 o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
10156 - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
10158 - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
10159 bugfix on 0.2.9.4-alpha.
10162 Changes in version 0.3.2.10 - 2018-03-03
10163 Tor 0.3.2.10 is the second stable release in the 0.3.2 series. It
10164 backports a number of bugfixes, including important fixes for security
10167 It includes an important security fix for a remote crash attack
10168 against directory authorities, tracked as TROVE-2018-001.
10170 Additionally, it backports a fix for a bug whose severity we have
10171 upgraded: Bug 24700, which was fixed in 0.3.3.2-alpha, can be remotely
10172 triggered in order to crash relays with a use-after-free pattern. As
10173 such, we are now tracking that bug as TROVE-2018-002 and
10174 CVE-2018-0491, and backporting it to earlier releases. This bug
10175 affected versions 0.3.2.1-alpha through 0.3.2.9, as well as version
10178 This release also backports our new system for improved resistance to
10179 denial-of-service attacks against relays.
10181 This release also fixes several minor bugs and annoyances from
10184 Relays running 0.3.2.x SHOULD upgrade to one of the versions released
10185 today, for the fix to TROVE-2018-002. Directory authorities should
10186 also upgrade. (Relays on earlier versions might want to update too for
10187 the DoS mitigations.)
10189 o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
10190 - Fix a protocol-list handling bug that could be used to remotely crash
10191 directory authorities with a null-pointer exception. Fixes bug 25074;
10192 bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
10195 o Major bugfixes (scheduler, KIST, denial-of-service, backport from 0.3.3.2-alpha):
10196 - Avoid adding the same channel twice in the KIST scheduler pending
10197 list, which could lead to remote denial-of-service use-after-free
10198 attacks against relays. Fixes bug 24700; bugfix on 0.3.2.1-alpha.
10200 o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
10201 - Give relays some defenses against the recent network overload. We
10202 start with three defenses (default parameters in parentheses).
10203 First: if a single client address makes too many concurrent
10204 connections (>100), hang up on further connections. Second: if a
10205 single client address makes circuits too quickly (more than 3 per
10206 second, with an allowed burst of 90) while also having too many
10207 connections open (3), refuse new create cells for the next while
10208 (1-2 hours). Third: if a client asks to establish a rendezvous
10209 point to you directly, ignore the request. These defenses can be
10210 manually controlled by new torrc options, but relays will also
10211 take guidance from consensus parameters, so there's no need to
10212 configure anything manually. Implements ticket 24902.
10214 o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
10215 - Fix an "off by 2" error in counting rendezvous failures on the
10216 onion service side. While we thought we would stop the rendezvous
10217 attempt after one failed circuit, we were actually making three
10218 circuit attempts before giving up. Now switch to a default of 2,
10219 and allow the consensus parameter "hs_service_max_rdv_failures" to
10220 override. Fixes bug 24895; bugfix on 0.0.6.
10221 - New-style (v3) onion services now obey the "max rendezvous circuit
10222 attempts" logic. Previously they would make as many rendezvous
10223 circuit attempts as they could fit in the MAX_REND_TIMEOUT second
10224 window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
10226 o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
10227 - Add Link protocol version 5 to the supported protocols list. Fixes
10228 bug 25070; bugfix on 0.3.1.1-alpha.
10230 o Major bugfixes (relay, backport from 0.3.3.1-alpha):
10231 - Fix a set of false positives where relays would consider
10232 connections to other relays as being client-only connections (and
10233 thus e.g. deserving different link padding schemes) if those
10234 relays fell out of the consensus briefly. Now we look only at the
10235 initial handshake and whether the connection authenticated as a
10236 relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
10238 o Major bugfixes (scheduler, consensus, backport from 0.3.3.2-alpha):
10239 - The scheduler subsystem was failing to promptly notice changes in
10240 consensus parameters, making it harder to switch schedulers
10241 network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
10243 o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
10244 - Make our OOM handler aware of the geoip client history cache so it
10245 doesn't fill up the memory. This check is important for IPv6 and
10246 our DoS mitigation subsystem. Closes ticket 25122.
10248 o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
10249 - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
10250 Previous versions of Tor would not have worked with OpenSSL 1.1.1,
10251 since they neither disabled TLS 1.3 nor enabled any of the
10252 ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
10253 Closes ticket 24978.
10255 o Minor features (geoip):
10256 - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
10259 o Minor features (logging, diagnostic, backport from 0.3.3.2-alpha):
10260 - When logging a failure to create an onion service's descriptor,
10261 also log what the problem with the descriptor was. Diagnostic
10264 o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
10265 - Use the actual observed address of an incoming relay connection,
10266 not the canonical address of the relay from its descriptor, when
10267 making decisions about how to handle the incoming connection.
10268 Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
10270 o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
10271 - Fix a possible crash on malformed consensus. If a consensus had
10272 contained an unparseable protocol line, it could have made clients
10273 and relays crash with a null-pointer exception. To exploit this
10274 issue, however, an attacker would need to be able to subvert the
10275 directory authority system. Fixes bug 25251; bugfix on
10276 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
10278 o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
10279 - Directory authorities, when refusing a descriptor from a rejected
10280 relay, now explicitly tell the relay (in its logs) to set a valid
10281 ContactInfo address and contact the bad-relays@ mailing list.
10282 Fixes bug 25170; bugfix on 0.2.9.1.
10284 o Minor bugfixes (build, rust, backport from 0.3.3.1-alpha):
10285 - When building with Rust on OSX, link against libresolv, to work
10286 around the issue at https://github.com/rust-lang/rust/issues/46797.
10287 Fixes bug 24652; bugfix on 0.3.1.1-alpha.
10289 o Minor bugfixes (onion services, backport from 0.3.3.2-alpha):
10290 - Remove a BUG() statement when a client fetches an onion descriptor
10291 that has a lower revision counter than the one in its cache. This
10292 can happen in normal circumstances due to HSDir desync. Fixes bug
10293 24976; bugfix on 0.3.2.1-alpha.
10295 o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
10296 - Don't treat inability to store a cached consensus object as a bug:
10297 it can happen normally when we are out of disk space. Fixes bug
10298 24859; bugfix on 0.3.1.1-alpha.
10300 o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
10301 - Improve the performance of our consensus-diff application code
10302 when Tor is built with the --enable-fragile-hardening option set.
10303 Fixes bug 24826; bugfix on 0.3.1.1-alpha.
10305 o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
10306 - Don't exit the Tor process if setrlimit() fails to change the file
10307 limit (which can happen sometimes on some versions of OSX). Fixes
10308 bug 21074; bugfix on 0.0.9pre5.
10310 o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
10311 - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
10313 - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
10314 bugfix on 0.2.9.4-alpha.
10316 o Minor bugfixes (testing, backport from 0.3.3.1-alpha):
10317 - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
10318 25005; bugfix on 0.3.2.7-rc.
10320 o Minor bugfixes (v3 onion services, backport from 0.3.3.2-alpha):
10321 - Look at the "HSRend" protocol version, not the "HSDir" protocol
10322 version, when deciding whether a consensus entry can support the
10323 v3 onion service protocol as a rendezvous point. Fixes bug 25105;
10324 bugfix on 0.3.2.1-alpha.
10326 o Code simplification and refactoring (backport from 0.3.3.3-alpha):
10327 - Update the "rust dependencies" submodule to be a project-level
10328 repository, rather than a user repository. Closes ticket 25323.
10330 o Documentation (backport from 0.3.3.1-alpha)
10331 - Document that operators who run more than one relay or bridge are
10332 expected to set MyFamily and ContactInfo correctly. Closes
10336 Changes in version 0.3.2.9 - 2018-01-09
10337 Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
10339 The 0.3.2 series includes our long-anticipated new onion service
10340 design, with numerous security features. (For more information, see
10341 our blog post at https://blog.torproject.org/fall-harvest.) We also
10342 have a new circuit scheduler algorithm for improved performance on
10343 relays everywhere (see https://blog.torproject.org/kist-and-tell),
10344 along with many smaller features and bugfixes.
10346 Per our stable release policy, we plan to support each stable release
10347 series for at least the next nine months, or for three months after
10348 the first stable release of the next series: whichever is longer. If
10349 you need a release with long-term support, we recommend that you stay
10350 with the 0.2.9 series.
10352 Below is a list of the changes since 0.3.1.7. For a list of all
10353 changes since 0.3.2.8-rc, see the ChangeLog file.
10355 o Directory authority changes:
10356 - Add "Bastet" as a ninth directory authority to the default list.
10357 Closes ticket 23910.
10358 - The directory authority "Longclaw" has changed its IP address.
10359 Closes ticket 23592.
10360 - Remove longclaw's IPv6 address, as it will soon change. Authority
10361 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
10362 3/8 directory authorities with IPv6 addresses, but there are also
10363 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
10364 - Add an IPv6 address for the "bastet" directory authority. Closes
10367 o Major features (next-generation onion services):
10368 - Tor now supports the next-generation onion services protocol for
10369 clients and services! As part of this release, the core of
10370 proposal 224 has been implemented and is available for
10371 experimentation and testing by our users. This newer version of
10372 onion services ("v3") features many improvements over the legacy
10375 a) Better crypto (replaced SHA1/DH/RSA1024
10376 with SHA3/ed25519/curve25519)
10378 b) Improved directory protocol, leaking much less information to
10381 c) Improved directory protocol, with smaller surface for
10384 d) Better onion address security against impersonation.
10386 e) More extensible introduction/rendezvous protocol.
10388 f) A cleaner and more modular codebase.
10390 You can identify a next-generation onion address by its length:
10391 they are 56 characters long, as in
10392 "4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion".
10394 In the future, we will release more options and features for v3
10395 onion services, but we first need a testing period, so that the
10396 current codebase matures and becomes more robust. Planned features
10397 include: offline keys, advanced client authorization, improved
10398 guard algorithms, and statistics. For full details, see
10401 Legacy ("v2") onion services will still work for the foreseeable
10402 future, and will remain the default until this new codebase gets
10403 tested and hardened. Service operators who want to experiment with
10404 the new system can use the 'HiddenServiceVersion 3' torrc
10405 directive along with the regular onion service configuration
10406 options. For more information, see our blog post at
10407 "https://blog.torproject.org/fall-harvest". Enjoy!
10409 o Major feature (scheduler, channel):
10410 - Tor now uses new schedulers to decide which circuits should
10411 deliver cells first, in order to improve congestion at relays. The
10412 first type is called "KIST" ("Kernel Informed Socket Transport"),
10413 and is only available on Linux-like systems: it uses feedback from
10414 the kernel to prevent the kernel's TCP buffers from growing too
10415 full. The second new scheduler type is called "KISTLite": it
10416 behaves the same as KIST, but runs on systems without kernel
10417 support for inspecting TCP implementation details. The old
10418 scheduler is still available, under the name "Vanilla". To change
10419 the default scheduler preference order, use the new "Schedulers"
10420 option. (The default preference order is "KIST,KISTLite,Vanilla".)
10422 Matt Traudt implemented KIST, based on research by Rob Jansen,
10423 John Geddes, Christ Wacek, Micah Sherr, and Paul Syverson. For
10424 more information, see the design paper at
10425 http://www.robgjansen.com/publications/kist-sec2014.pdf and the
10426 followup implementation paper at https://arxiv.org/abs/1709.01044.
10427 Closes ticket 12541. For more information, see our blog post at
10428 "https://blog.torproject.org/kist-and-tell".
10430 o Major bugfixes (security, general):
10431 - Fix a denial of service bug where an attacker could use a
10432 malformed directory object to cause a Tor instance to pause while
10433 OpenSSL would try to read a passphrase from the terminal. (Tor
10434 instances run without a terminal, which is the case for most Tor
10435 packages, are not impacted.) Fixes bug 24246; bugfix on every
10436 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
10437 Found by OSS-Fuzz as testcase 6360145429790720.
10439 o Major bugfixes (security, directory authority):
10440 - Fix a denial of service issue where an attacker could crash a
10441 directory authority using a malformed router descriptor. Fixes bug
10442 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
10445 o Major bugfixes (security, onion service v2):
10446 - Fix a use-after-free error that could crash v2 Tor onion services
10447 when they failed to open circuits while expiring introduction
10448 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
10449 also tracked as TROVE-2017-013 and CVE-2017-8823.
10450 - When checking for replays in the INTRODUCE1 cell data for a
10451 (legacy) onion service, correctly detect replays in the RSA-
10452 encrypted part of the cell. We were previously checking for
10453 replays on the entire cell, but those can be circumvented due to
10454 the malleability of Tor's legacy hybrid encryption. This fix helps
10455 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
10456 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
10459 o Major bugfixes (security, relay):
10460 - When running as a relay, make sure that we never build a path
10461 through ourselves, even in the case where we have somehow lost the
10462 version of our descriptor appearing in the consensus. Fixes part
10463 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
10464 as TROVE-2017-012 and CVE-2017-8822.
10465 - When running as a relay, make sure that we never choose ourselves
10466 as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
10467 issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
10469 o Major bugfixes (bootstrapping):
10470 - Fetch descriptors aggressively whenever we lack enough to build
10471 circuits, regardless of how many descriptors we are missing.
10472 Previously, we would delay launching the fetch when we had fewer
10473 than 15 missing descriptors, even if some of those descriptors
10474 were blocking circuits from building. Fixes bug 23985; bugfix on
10475 0.1.1.11-alpha. The effects of this bug became worse in
10476 0.3.0.3-alpha, when we began treating missing descriptors from our
10477 primary guards as a reason to delay circuits.
10478 - Don't try fetching microdescriptors from relays that have failed
10479 to deliver them in the past. Fixes bug 23817; bugfix
10482 o Major bugfixes (circuit prediction):
10483 - Fix circuit prediction logic so that a client doesn't treat a port
10484 as being "handled" by a circuit if that circuit already has
10485 isolation settings on it. This change should make Tor clients more
10486 responsive by improving their chances of having a pre-created
10487 circuit ready for use when a request arrives. Fixes bug 18859;
10488 bugfix on 0.2.3.3-alpha.
10490 o Major bugfixes (exit relays, DNS):
10491 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
10492 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
10493 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
10494 identifying and finding a workaround to this bug and to Moritz,
10495 Arthur Edelstein, and Roger for helping to track it down and
10498 o Major bugfixes (relay, crash, assertion failure):
10499 - Fix a timing-based assertion failure that could occur when the
10500 circuit out-of-memory handler freed a connection's output buffer.
10501 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
10503 o Major bugfixes (usability, control port):
10504 - Report trusted clock skew indications as bootstrap errors, so
10505 controllers can more easily alert users when their clocks are
10506 wrong. Fixes bug 23506; bugfix on 0.1.2.6-alpha.
10508 o Minor features (bridge):
10509 - Bridge relays can now set the BridgeDistribution config option to
10510 add a "bridge-distribution-request" line to their bridge
10511 descriptor, which tells BridgeDB how they'd like their bridge
10512 address to be given out. (Note that as of Oct 2017, BridgeDB does
10513 not yet implement this feature.) As a side benefit, this feature
10514 provides a way to distinguish bridge descriptors from non-bridge
10515 descriptors. Implements tickets 18329.
10516 - When handling the USERADDR command on an ExtOrPort, warn when the
10517 transports provides a USERADDR with no port. In a future version,
10518 USERADDR commands of this format may be rejected. Detects problems
10519 related to ticket 23080.
10521 o Minor features (bug detection):
10522 - Log a warning message with a stack trace for any attempt to call
10523 get_options() during option validation. This pattern has caused
10524 subtle bugs in the past. Closes ticket 22281.
10526 o Minor features (build, compilation):
10527 - The "check-changes" feature is now part of the "make check" tests;
10528 we'll use it to try to prevent misformed changes files from
10529 accumulating. Closes ticket 23564.
10530 - Tor builds should now fail if there are any mismatches between the
10531 C type representing a configuration variable and the C type the
10532 data-driven parser uses to store a value there. Previously, we
10533 needed to check these by hand, which sometimes led to mistakes.
10534 Closes ticket 23643.
10536 o Minor features (client):
10537 - You can now use Tor as a tunneled HTTP proxy: use the new
10538 HTTPTunnelPort option to open a port that accepts HTTP CONNECT
10539 requests. Closes ticket 22407.
10540 - Add an extra check to make sure that we always use the newer guard
10541 selection code for picking our guards. Closes ticket 22779.
10542 - When downloading (micro)descriptors, don't split the list into
10543 multiple requests unless we want at least 32 descriptors.
10544 Previously, we split at 4, not 32, which led to significant
10545 overhead in HTTP request size and degradation in compression
10546 performance. Closes ticket 23220.
10547 - Improve log messages when missing descriptors for primary guards.
10548 Resolves ticket 23670.
10550 o Minor features (command line):
10551 - Add a new commandline option, --key-expiration, which prints when
10552 the current signing key is going to expire. Implements ticket
10553 17639; patch by Isis Lovecruft.
10555 o Minor features (control port):
10556 - If an application tries to use the control port as an HTTP proxy,
10557 respond with a meaningful "This is the Tor control port" message,
10558 and log the event. Closes ticket 1667. Patch from Ravi
10560 - Provide better error message for GETINFO desc/(id|name) when not
10561 fetching router descriptors. Closes ticket 5847. Patch by
10563 - Add GETINFO "{desc,md}/download-enabled", to inform the controller
10564 whether Tor will try to download router descriptors and
10565 microdescriptors respectively. Closes ticket 22684.
10566 - Added new GETINFO targets "ip-to-country/{ipv4,ipv6}-available",
10567 so controllers can tell whether the geoip databases are loaded.
10568 Closes ticket 23237.
10569 - Adds a timestamp field to the CIRC_BW and STREAM_BW bandwidth
10570 events. Closes ticket 19254. Patch by "DonnchaC".
10572 o Minor features (development support):
10573 - Developers can now generate a call-graph for Tor using the
10574 "calltool" python program, which post-processes object dumps. It
10575 should work okay on many Linux and OSX platforms, and might work
10576 elsewhere too. To run it, install calltool from
10577 https://gitweb.torproject.org/user/nickm/calltool.git and run
10578 "make callgraph". Closes ticket 19307.
10580 o Minor features (directory authority):
10581 - Make the "Exit" flag assignment only depend on whether the exit
10582 policy allows connections to ports 80 and 443. Previously relays
10583 would get the Exit flag if they allowed connections to one of
10584 these ports and also port 6667. Resolves ticket 23637.
10586 o Minor features (ed25519):
10587 - Add validation function to checks for torsion components in
10588 ed25519 public keys, used by prop224 client-side code. Closes
10589 ticket 22006. Math help by Ian Goldberg.
10591 o Minor features (exit relay, DNS):
10592 - Improve the clarity and safety of the log message from evdns when
10593 receiving an apparently spoofed DNS reply. Closes ticket 3056.
10595 o Minor features (fallback directory mirrors):
10596 - The fallback directory list has been re-generated based on the
10597 current status of the network. Tor uses fallback directories to
10598 bootstrap when it doesn't yet have up-to-date directory
10599 information. Closes ticket 24801.
10600 - Make the default DirAuthorityFallbackRate 0.1, so that clients
10601 prefer to bootstrap from fallback directory mirrors. This is a
10602 follow-up to 24679, which removed weights from the default
10603 fallbacks. Implements ticket 24681.
10605 o Minor features (geoip):
10606 - Update geoip and geoip6 to the January 5 2018 Maxmind GeoLite2
10609 o Minor features (integration, hardening):
10610 - Add a new NoExec option to prevent Tor from running other
10611 programs. When this option is set to 1, Tor will never try to run
10612 another program, regardless of the settings of
10613 PortForwardingHelper, ClientTransportPlugin, or
10614 ServerTransportPlugin. Once NoExec is set, it cannot be disabled
10615 without restarting Tor. Closes ticket 22976.
10617 o Minor features (linux seccomp2 sandbox):
10618 - Update the sandbox rules so that they should now work correctly
10619 with Glibc 2.26. Closes ticket 24315.
10621 o Minor features (logging):
10622 - Provide better warnings when the getrandom() syscall fails. Closes
10624 - Downgrade a pair of log messages that could occur when an exit's
10625 resolver gave us an unusual (but not forbidden) response. Closes
10627 - Improve the message we log when re-enabling circuit build timeouts
10628 after having received a consensus. Closes ticket 20963.
10629 - Log more circuit information whenever we are about to try to
10630 package a relay cell on a circuit with a nonexistent n_chan.
10631 Attempt to diagnose ticket 8185.
10632 - Improve info-level log identification of particular circuits, to
10633 help with debugging. Closes ticket 23645.
10634 - Improve the warning message for specifying a relay by nickname.
10635 The previous message implied that nickname registration was still
10636 part of the Tor network design, which it isn't. Closes
10638 - If the sandbox filter fails to load, suggest to the user that
10639 their kernel might not support seccomp2. Closes ticket 23090.
10641 o Minor features (onion service, circuit, logging):
10642 - Improve logging of many callsite in the circuit subsystem to print
10643 the circuit identifier(s).
10644 - Log when we cleanup an intro point from a service so we know when
10645 and for what reason it happened. Closes ticket 23604.
10647 o Minor features (portability):
10648 - Tor now compiles correctly on arm64 with libseccomp-dev installed.
10649 (It doesn't yet work with the sandbox enabled.) Closes
10651 - Check at configure time whether uint8_t is the same type as
10652 unsigned char. Lots of existing code already makes this
10653 assumption, and there could be strict aliasing issues if the
10654 assumption is violated. Closes ticket 22410.
10656 o Minor features (relay):
10657 - When choosing which circuits can be expired as unused, consider
10658 circuits from clients even if those clients used regular CREATE
10659 cells to make them; and do not consider circuits from relays even
10660 if they were made with CREATE_FAST. Part of ticket 22805.
10661 - Reject attempts to use relative file paths when RunAsDaemon is
10662 set. Previously, Tor would accept these, but the directory-
10663 changing step of RunAsDaemon would give strange and/or confusing
10664 results. Closes ticket 22731.
10666 o Minor features (relay statistics):
10667 - Change relay bandwidth reporting stats interval from 4 hours to 24
10668 hours in order to reduce the efficiency of guard discovery
10669 attacks. Fixes ticket 23856.
10671 o Minor features (reverted deprecations):
10672 - The ClientDNSRejectInternalAddresses flag can once again be set in
10673 non-testing Tor networks, so long as they do not use the default
10674 directory authorities. This change also removes the deprecation of
10675 this flag from 0.2.9.2-alpha. Closes ticket 21031.
10677 o Minor features (robustness):
10678 - Change several fatal assertions when flushing buffers into non-
10679 fatal assertions, to prevent any recurrence of 23690.
10681 o Minor features (startup, safety):
10682 - When configured to write a PID file, Tor now exits if it is unable
10683 to do so. Previously, it would warn and continue. Closes
10686 o Minor features (static analysis):
10687 - The BUG() macro has been changed slightly so that Coverity no
10688 longer complains about dead code if the bug is impossible. Closes
10691 o Minor features (testing):
10692 - Our fuzzing tests now test the encrypted portions of v3 onion
10693 service descriptors. Implements more of 21509.
10694 - Add a unit test to make sure that our own generated platform
10695 string will be accepted by directory authorities. Closes
10697 - The default chutney network tests now include tests for the v3
10698 onion service design. Make sure you have the latest version of
10699 chutney if you want to run these. Closes ticket 22437.
10700 - Add a unit test to verify that we can parse a hardcoded v2 onion
10701 service descriptor. Closes ticket 15554.
10703 o Minor bugfixes (address selection):
10704 - When the fascist_firewall_choose_address_ functions don't find a
10705 reachable address, set the returned address to the null address
10706 and port. This is a precautionary measure, because some callers do
10707 not check the return value. Fixes bug 24736; bugfix
10710 o Minor bugfixes (bootstrapping):
10711 - When warning about state file clock skew, report the correct
10712 direction for the detected skew. Fixes bug 23606; bugfix
10715 o Minor bugfixes (bridge clients, bootstrap):
10716 - Retry directory downloads when we get our first bridge descriptor
10717 during bootstrap or while reconnecting to the network. Keep
10718 retrying every time we get a bridge descriptor, until we have a
10719 reachable bridge. Fixes part of bug 24367; bugfix on 0.2.0.3-alpha.
10720 - Stop delaying bridge descriptor fetches when we have cached bridge
10721 descriptors. Instead, only delay bridge descriptor fetches when we
10722 have at least one reachable bridge. Fixes part of bug 24367;
10723 bugfix on 0.2.0.3-alpha.
10724 - Stop delaying directory fetches when we have cached bridge
10725 descriptors. Instead, only delay bridge descriptor fetches when
10726 all our bridges are definitely unreachable. Fixes part of bug
10727 24367; bugfix on 0.2.0.3-alpha.
10729 o Minor bugfixes (bridge):
10730 - Overwrite the bridge address earlier in the process of retrieving
10731 its descriptor, to make sure we reach it on the configured
10732 address. Fixes bug 20532; bugfix on 0.2.0.10-alpha.
10734 o Minor bugfixes (build, compilation):
10735 - Fix a compilation warning when building with zstd support on
10736 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
10737 and fixed by Andreas Stieger.
10738 - When searching for OpenSSL, don't accept any OpenSSL library that
10739 lacks TLSv1_1_method(): Tor doesn't build with those versions.
10740 Additionally, look in /usr/local/opt/openssl, if it's present.
10741 These changes together repair the default build on OSX systems
10742 with Homebrew installed. Fixes bug 23602; bugfix on 0.2.7.2-alpha.
10743 - Fix a signed/unsigned comparison warning introduced by our fix to
10744 TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
10745 - Fix a memory leak warning in one of the libevent-related
10746 configuration tests that could occur when manually specifying
10747 -fsanitize=address. Fixes bug 24279; bugfix on 0.3.0.2-alpha.
10748 Found and patched by Alex Xu.
10749 - Fix unused-variable warnings in donna's Curve25519 SSE2 code.
10750 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
10752 o Minor bugfixes (certificate handling):
10753 - Fix a time handling bug in Tor certificates set to expire after
10754 the year 2106. Fixes bug 23055; bugfix on 0.3.0.1-alpha. Found by
10755 Coverity as CID 1415728.
10757 o Minor bugfixes (client):
10758 - By default, do not enable storage of client-side DNS values. These
10759 values were unused by default previously, but they should not have
10760 been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
10762 o Minor bugfixes (client, usability):
10763 - Refrain from needlessly rejecting SOCKS5-with-hostnames and
10764 SOCKS4a requests that contain IP address strings, even when
10765 SafeSocks in enabled, as this prevents user from connecting to
10766 known IP addresses without relying on DNS for resolving. SafeSocks
10767 still rejects SOCKS connections that connect to IP addresses when
10768 those addresses are _not_ encoded as hostnames. Fixes bug 22461;
10769 bugfix on Tor 0.2.6.2-alpha.
10771 o Minor bugfixes (code correctness):
10772 - Call htons() in extend_cell_format() for encoding a 16-bit value.
10773 Previously we used ntohs(), which happens to behave the same on
10774 all the platforms we support, but which isn't really correct.
10775 Fixes bug 23106; bugfix on 0.2.4.8-alpha.
10776 - For defense-in-depth, make the controller's write_escaped_data()
10777 function robust to extremely long inputs. Fixes bug 19281; bugfix
10778 on 0.1.1.1-alpha. Reported by Guido Vranken.
10779 - Fix several places in our codebase where a C compiler would be
10780 likely to eliminate a check, based on assuming that undefined
10781 behavior had not happened elsewhere in the code. These cases are
10782 usually a sign of redundant checking or dubious arithmetic. Found
10783 by Georg Koppen using the "STACK" tool from Wang, Zeldovich,
10784 Kaashoek, and Solar-Lezama. Fixes bug 24423; bugfix on various
10787 o Minor bugfixes (compression):
10788 - Handle a pathological case when decompressing Zstandard data when
10789 the output buffer size is zero. Fixes bug 23551; bugfix
10792 o Minor bugfixes (consensus expiry):
10793 - Check for adequate directory information correctly. Previously, Tor
10794 would reconsider whether it had sufficient directory information
10795 every 2 minutes. Fixes bug 23091; bugfix on 0.2.0.19-alpha.
10797 o Minor bugfixes (control port, linux seccomp2 sandbox):
10798 - Avoid a crash when attempting to use the seccomp2 sandbox together
10799 with the OwningControllerProcess feature. Fixes bug 24198; bugfix
10802 o Minor bugfixes (control port, onion services):
10803 - Report "FAILED" instead of "UPLOAD_FAILED" "FAILED" for the
10804 HS_DESC event when a service is not able to upload a descriptor.
10805 Fixes bug 24230; bugfix on 0.2.7.1-alpha.
10807 o Minor bugfixes (directory cache):
10808 - Recover better from empty or corrupt files in the consensus cache
10809 directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
10810 - When a consensus diff calculation is only partially successful,
10811 only record the successful parts as having succeeded. Partial
10812 success can happen if (for example) one compression method fails
10813 but the others succeed. Previously we misrecorded all the
10814 calculations as having succeeded, which would later cause a
10815 nonfatal assertion failure. Fixes bug 24086; bugfix
10818 o Minor bugfixes (directory client):
10819 - On failure to download directory information, delay retry attempts
10820 by a random amount based on the "decorrelated jitter" algorithm.
10821 Our previous delay algorithm tended to produce extra-long delays
10822 too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
10824 o Minor bugfixes (directory protocol):
10825 - Directory servers now include a "Date:" http header for response
10826 codes other than 200. Clients starting with a skewed clock and a
10827 recent consensus were getting "304 Not modified" responses from
10828 directory authorities, so without the Date header, the client
10829 would never hear about a wrong clock. Fixes bug 23499; bugfix
10831 - Make clients wait for 6 seconds before trying to download a
10832 consensus from an authority. Fixes bug 17750; bugfix
10835 o Minor bugfixes (documentation):
10836 - Document better how to read gcov, and what our gcov postprocessing
10837 scripts do. Fixes bug 23739; bugfix on 0.2.9.1-alpha.
10838 - Fix manpage to not refer to the obsolete (and misspelled)
10839 UseEntryGuardsAsDirectoryGuards parameter in the description of
10840 NumDirectoryGuards. Fixes bug 23611; bugfix on 0.2.4.8-alpha.
10842 o Minor bugfixes (DoS-resistance):
10843 - If future code asks if there are any running bridges, without
10844 checking if bridges are enabled, log a BUG warning rather than
10845 crashing. Fixes bug 23524; bugfix on 0.3.0.1-alpha.
10847 o Minor bugfixes (entry guards):
10848 - Tor now updates its guard state when it reads a consensus
10849 regardless of whether it's missing descriptors. That makes tor use
10850 its primary guards to fetch descriptors in some edge cases where
10851 it would previously have used fallback directories. Fixes bug
10852 23862; bugfix on 0.3.0.1-alpha.
10854 o Minor bugfixes (format strictness):
10855 - Restrict several data formats to decimal. Previously, the
10856 BuildTimeHistogram entries in the state file, the "bw=" entries in
10857 the bandwidth authority file, and the process IDs passed to the
10858 __OwningControllerProcess option could all be specified in hex or
10859 octal as well as in decimal. This was not an intentional feature.
10860 Fixes bug 22802; bugfixes on 0.2.2.1-alpha, 0.2.2.2-alpha,
10863 o Minor bugfixes (heartbeat):
10864 - If we fail to write a heartbeat message, schedule a retry for the
10865 minimum heartbeat interval number of seconds in the future. Fixes
10866 bug 19476; bugfix on 0.2.3.1-alpha.
10868 o Minor bugfixes (logging):
10869 - Suppress a log notice when relay descriptors arrive. We already
10870 have a bootstrap progress for this so no need to log notice
10871 everytime tor receives relay descriptors. Microdescriptors behave
10872 the same. Fixes bug 23861; bugfix on 0.2.8.2-alpha.
10873 - Remove duplicate log messages regarding opening non-local
10874 SocksPorts upon parsing config and opening listeners at startup.
10875 Fixes bug 4019; bugfix on 0.2.3.3-alpha.
10876 - Use a more comprehensible log message when telling the user
10877 they've excluded every running exit node. Fixes bug 7890; bugfix
10879 - When logging the number of descriptors we intend to download per
10880 directory request, do not log a number higher than then the number
10881 of descriptors we're fetching in total. Fixes bug 19648; bugfix
10883 - When warning about a directory owned by the wrong user, log the
10884 actual name of the user owning the directory. Previously, we'd log
10885 the name of the process owner twice. Fixes bug 23487; bugfix
10887 - Fix some messages on unexpected errors from the seccomp2 library.
10888 Fixes bug 22750; bugfix on 0.2.5.1-alpha. Patch from "cypherpunks".
10889 - The tor specification says hop counts are 1-based, so fix two log
10890 messages that mistakenly logged 0-based hop counts. Fixes bug
10891 18982; bugfix on 0.2.6.2-alpha and 0.2.4.5-alpha. Patch by teor.
10892 Credit to Xiaofan Li for reporting this issue.
10894 o Minor bugfixes (logging, relay shutdown, annoyance):
10895 - When a circuit is marked for close, do not attempt to package any
10896 cells for channels on that circuit. Previously, we would detect
10897 this condition lower in the call stack, when we noticed that the
10898 circuit had no attached channel, and log an annoying message.
10899 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
10901 o Minor bugfixes (memory safety, defensive programming):
10902 - Clear the target address when node_get_prim_orport() returns
10903 early. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
10905 o Minor bugfixes (memory usage):
10906 - When queuing DESTROY cells on a channel, only queue the circuit-id
10907 and reason fields: not the entire 514-byte cell. This fix should
10908 help mitigate any bugs or attacks that fill up these queues, and
10909 free more RAM for other uses. Fixes bug 24666; bugfix
10912 o Minor bugfixes (network layer):
10913 - When closing a connection via close_connection_immediately(), we
10914 mark it as "not blocked on bandwidth", to prevent later calls from
10915 trying to unblock it, and give it permission to read. This fixes a
10916 backtrace warning that can happen on relays under various
10917 circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
10919 o Minor bugfixes (onion services):
10920 - The introduction circuit was being timed out too quickly while
10921 waiting for the rendezvous circuit to complete. Keep the intro
10922 circuit around longer instead of timing out and reopening new ones
10923 constantly. Fixes bug 23681; bugfix on 0.2.4.8-alpha.
10924 - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
10925 so it matches dir-spec.txt. Fixes bug 24262; bugfix
10927 - When handling multiple SOCKS request for the same .onion address,
10928 only fetch the service descriptor once.
10929 - Avoid a possible double close of a circuit by the intro point on
10930 error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
10931 bugfix on 0.3.0.1-alpha.
10932 - When reloading configured onion services, copy all information
10933 from the old service object. Previously, some data was omitted,
10934 causing delays in descriptor upload, and other bugs. Fixes bug
10935 23790; bugfix on 0.2.1.9-alpha.
10937 o Minor bugfixes (path selection):
10938 - When selecting relays by bandwidth, avoid a rounding error that
10939 could sometimes cause load to be imbalanced incorrectly.
10940 Previously, we would always round upwards; now, we round towards
10941 the nearest integer. This had the biggest effect when a relay's
10942 weight adjustments should have given it weight 0, but it got
10943 weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
10944 - When calculating the fraction of nodes that have descriptors, and
10945 all nodes in the network have zero bandwidths, count the number of
10946 nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
10947 - Actually log the total bandwidth in compute_weighted_bandwidths().
10948 Fixes bug 24170; bugfix on 0.2.4.3-alpha.
10950 o Minor bugfixes (portability):
10951 - Stop using the PATH_MAX variable, which is not defined on GNU
10952 Hurd. Fixes bug 23098; bugfix on 0.3.1.1-alpha.
10953 - Fix a bug in the bit-counting parts of our timing-wheel code on
10954 MSVC. (Note that MSVC is still not a supported build platform, due
10955 to cryptographic timing channel risks.) Fixes bug 24633; bugfix
10958 o Minor bugfixes (relay):
10959 - When uploading our descriptor for the first time after startup,
10960 report the reason for uploading as "Tor just started" rather than
10961 leaving it blank. Fixes bug 22885; bugfix on 0.2.3.4-alpha.
10962 - Avoid unnecessary calls to directory_fetches_from_authorities() on
10963 relays, to prevent spurious address resolutions and descriptor
10964 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
10965 bugfix on in 0.2.8.1-alpha.
10966 - Avoid a crash when transitioning from client mode to bridge mode.
10967 Previously, we would launch the worker threads whenever our
10968 "public server" mode changed, but not when our "server" mode
10969 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
10971 o Minor bugfixes (testing):
10972 - Fix a spurious fuzzing-only use of an uninitialized value. Found
10973 by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
10974 - Test that IPv6-only clients can use microdescriptors when running
10975 "make test-network-all". Requires chutney master 61c28b9 or later.
10976 Closes ticket 24109.
10977 - Prevent scripts/test/coverage from attempting to move gcov output
10978 to the root directory. Fixes bug 23741; bugfix on 0.2.5.1-alpha.
10979 - Capture and detect several "Result does not fit" warnings in unit
10980 tests on platforms with 32-bit time_t. Fixes bug 21800; bugfix
10982 - Fix additional channelpadding unit test failures by using mocked
10983 time instead of actual time for all tests. Fixes bug 23608; bugfix
10985 - Fix a bug in our fuzzing mock replacement for crypto_pk_checksig(),
10986 to correctly handle cases where a caller gives it an RSA key of
10987 under 160 bits. (This is not actually a bug in Tor itself, but
10988 rather in our fuzzing code.) Fixes bug 24247; bugfix on
10989 0.3.0.3-alpha. Found by OSS-Fuzz as issue 4177.
10990 - Fix a broken unit test for the OutboundAddress option: the parsing
10991 function was never returning an error on failure. Fixes bug 23366;
10992 bugfix on 0.3.0.3-alpha.
10993 - Fix a signed-integer overflow in the unit tests for
10994 dir/download_status_random_backoff, which was untriggered until we
10995 fixed bug 17750. Fixes bug 22924; bugfix on 0.2.9.1-alpha.
10997 o Minor bugfixes (usability, control port):
10998 - Stop making an unnecessary routerlist check in NETINFO clock skew
10999 detection; this was preventing clients from reporting NETINFO clock
11000 skew to controllers. Fixes bug 23532; bugfix on 0.2.4.4-alpha.
11002 o Code simplification and refactoring:
11003 - Remove various ways of testing circuits and connections for
11004 "clientness"; instead, favor channel_is_client(). Part of
11006 - Extract the code for handling newly-open channels into a separate
11007 function from the general code to handle channel state
11008 transitions. This change simplifies our callgraph, reducing the
11009 size of the largest strongly connected component by roughly a
11010 factor of two. Closes ticket 22608.
11011 - Remove dead code for largely unused statistics on the number of
11012 times we've attempted various public key operations. Fixes bug
11013 19871; bugfix on 0.1.2.4-alpha. Fix by Isis Lovecruft.
11014 - Remove several now-obsolete functions for asking about old
11015 variants directory authority status. Closes ticket 22311; patch
11017 - Remove some of the code that once supported "Named" and "Unnamed"
11018 routers. Authorities no longer vote for these flags. Closes
11020 - Rename the obsolete malleable hybrid_encrypt functions used in TAP
11021 and old hidden services, to indicate that they aren't suitable for
11022 new protocols or formats. Closes ticket 23026.
11023 - Replace our STRUCT_OFFSET() macro with offsetof(). Closes ticket
11024 22521. Patch from Neel Chauhan.
11025 - Split the enormous circuit_send_next_onion_skin() function into
11026 multiple subfunctions. Closes ticket 22804.
11027 - Split the portions of the buffer.c module that handle particular
11028 protocols into separate modules. Part of ticket 23149.
11029 - Use our test macros more consistently, to produce more useful
11030 error messages when our unit tests fail. Add coccinelle patches to
11031 allow us to re-check for test macro uses. Closes ticket 22497.
11033 o Deprecated features:
11034 - The ReachableDirAddresses and ClientPreferIPv6DirPort options are
11035 now deprecated; they do not apply to relays, and they have had no
11036 effect on clients since 0.2.8.x. Closes ticket 19704.
11037 - Deprecate HTTPProxy/HTTPProxyAuthenticator config options. They
11038 only applies to direct unencrypted HTTP connections to your
11039 directory server, which your Tor probably isn't using. Closes
11043 - Add notes in man page regarding OS support for the various
11044 scheduler types. Attempt to use less jargon in the scheduler
11045 section. Closes ticket 24254.
11046 - Clarify that the Address option is entirely about setting an
11047 advertised IPv4 address. Closes ticket 18891.
11048 - Clarify the manpage's use of the term "address" to clarify what
11049 kind of address is intended. Closes ticket 21405.
11050 - Document that onion service subdomains are allowed, and ignored.
11051 Closes ticket 18736.
11052 - Clarify in the manual that "Sandbox 1" is only supported on Linux
11053 kernels. Closes ticket 22677.
11054 - Document all values of PublishServerDescriptor in the manpage.
11055 Closes ticket 15645.
11056 - Improve the documentation for the directory port part of the
11057 DirAuthority line. Closes ticket 20152.
11058 - Restore documentation for the authorities' "approved-routers"
11059 file. Closes ticket 21148.
11061 o Removed features:
11062 - The AllowDotExit option has been removed as unsafe. It has been
11063 deprecated since 0.2.9.2-alpha. Closes ticket 23426.
11064 - The ClientDNSRejectInternalAddresses flag can no longer be set on
11065 non-testing networks. It has been deprecated since 0.2.9.2-alpha.
11066 Closes ticket 21031.
11067 - The controller API no longer includes an AUTHDIR_NEWDESCS event:
11068 nobody was using it any longer. Closes ticket 22377.
11071 Changes in version 0.3.1.9 - 2017-12-01:
11072 Tor 0.3.1.9 backports important security and stability fixes from the
11073 0.3.2 development series. All Tor users should upgrade to this
11074 release, or to another of the releases coming out today.
11076 o Major bugfixes (security, backport from 0.3.2.6-alpha):
11077 - Fix a denial of service bug where an attacker could use a
11078 malformed directory object to cause a Tor instance to pause while
11079 OpenSSL would try to read a passphrase from the terminal. (Tor
11080 instances run without a terminal, which is the case for most Tor
11081 packages, are not impacted.) Fixes bug 24246; bugfix on every
11082 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
11083 Found by OSS-Fuzz as testcase 6360145429790720.
11084 - Fix a denial of service issue where an attacker could crash a
11085 directory authority using a malformed router descriptor. Fixes bug
11086 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
11088 - When checking for replays in the INTRODUCE1 cell data for a
11089 (legacy) onion service, correctly detect replays in the RSA-
11090 encrypted part of the cell. We were previously checking for
11091 replays on the entire cell, but those can be circumvented due to
11092 the malleability of Tor's legacy hybrid encryption. This fix helps
11093 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
11094 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
11097 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
11098 - Fix a use-after-free error that could crash v2 Tor onion services
11099 when they failed to open circuits while expiring introduction
11100 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
11101 also tracked as TROVE-2017-013 and CVE-2017-8823.
11103 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
11104 - When running as a relay, make sure that we never build a path
11105 through ourselves, even in the case where we have somehow lost the
11106 version of our descriptor appearing in the consensus. Fixes part
11107 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
11108 as TROVE-2017-012 and CVE-2017-8822.
11109 - When running as a relay, make sure that we never choose ourselves
11110 as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
11111 issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
11113 o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
11114 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
11115 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
11116 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
11117 identifying and finding a workaround to this bug and to Moritz,
11118 Arthur Edelstein, and Roger for helping to track it down and
11121 o Minor features (bridge):
11122 - Bridges now include notice in their descriptors that they are
11123 bridges, and notice of their distribution status, based on their
11124 publication settings. Implements ticket 18329. For more fine-
11125 grained control of how a bridge is distributed, upgrade to 0.3.2.x
11128 o Minor features (directory authority, backport from 0.3.2.6-alpha):
11129 - Add an IPv6 address for the "bastet" directory authority. Closes
11132 o Minor features (geoip):
11133 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
11136 o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
11137 - Avoid unnecessary calls to directory_fetches_from_authorities() on
11138 relays, to prevent spurious address resolutions and descriptor
11139 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
11140 bugfix on in 0.2.8.1-alpha.
11142 o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
11143 - Fix unused variable warnings in donna's Curve25519 SSE2 code.
11144 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
11146 o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
11147 - When a circuit is marked for close, do not attempt to package any
11148 cells for channels on that circuit. Previously, we would detect
11149 this condition lower in the call stack, when we noticed that the
11150 circuit had no attached channel, and log an annoying message.
11151 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
11153 o Minor bugfixes (onion service, backport from 0.3.2.5-alpha):
11154 - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
11155 so it matches dir-spec.txt. Fixes bug 24262; bugfix
11158 o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
11159 - Avoid a crash when transitioning from client mode to bridge mode.
11160 Previously, we would launch the worker threads whenever our
11161 "public server" mode changed, but not when our "server" mode
11162 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
11165 Changes in version 0.3.0.13 - 2017-12-01
11166 Tor 0.3.0.13 backports important security and stability bugfixes from
11167 later Tor releases. All Tor users should upgrade to this release, or
11168 to another of the releases coming out today.
11170 Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
11171 2018. If you need a release with long-term support, please stick with
11172 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
11174 o Major bugfixes (security, backport from 0.3.2.6-alpha):
11175 - Fix a denial of service bug where an attacker could use a
11176 malformed directory object to cause a Tor instance to pause while
11177 OpenSSL would try to read a passphrase from the terminal. (Tor
11178 instances run without a terminal, which is the case for most Tor
11179 packages, are not impacted.) Fixes bug 24246; bugfix on every
11180 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
11181 Found by OSS-Fuzz as testcase 6360145429790720.
11182 - Fix a denial of service issue where an attacker could crash a
11183 directory authority using a malformed router descriptor. Fixes bug
11184 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
11186 - When checking for replays in the INTRODUCE1 cell data for a
11187 (legacy) onion service, correctly detect replays in the RSA-
11188 encrypted part of the cell. We were previously checking for
11189 replays on the entire cell, but those can be circumvented due to
11190 the malleability of Tor's legacy hybrid encryption. This fix helps
11191 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
11192 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
11195 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
11196 - Fix a use-after-free error that could crash v2 Tor onion services
11197 when they failed to open circuits while expiring introduction
11198 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
11199 also tracked as TROVE-2017-013 and CVE-2017-8823.
11201 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
11202 - When running as a relay, make sure that we never build a path
11203 through ourselves, even in the case where we have somehow lost the
11204 version of our descriptor appearing in the consensus. Fixes part
11205 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
11206 as TROVE-2017-012 and CVE-2017-8822.
11207 - When running as a relay, make sure that we never choose ourselves
11208 as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
11209 issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
11211 o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
11212 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
11213 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
11214 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
11215 identifying and finding a workaround to this bug and to Moritz,
11216 Arthur Edelstein, and Roger for helping to track it down and
11219 o Minor features (security, windows, backport from 0.3.1.1-alpha):
11220 - Enable a couple of pieces of Windows hardening: one
11221 (HeapEnableTerminationOnCorruption) that has been on-by-default
11222 since Windows 8, and unavailable before Windows 7; and one
11223 (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
11224 affect us, but shouldn't do any harm. Closes ticket 21953.
11226 o Minor features (bridge, backport from 0.3.1.9):
11227 - Bridges now include notice in their descriptors that they are
11228 bridges, and notice of their distribution status, based on their
11229 publication settings. Implements ticket 18329. For more fine-
11230 grained control of how a bridge is distributed, upgrade to 0.3.2.x
11233 o Minor features (directory authority, backport from 0.3.2.6-alpha):
11234 - Add an IPv6 address for the "bastet" directory authority. Closes
11237 o Minor features (geoip):
11238 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
11241 o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
11242 - Avoid unnecessary calls to directory_fetches_from_authorities() on
11243 relays, to prevent spurious address resolutions and descriptor
11244 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
11245 bugfix on in 0.2.8.1-alpha.
11247 o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
11248 - Fix unused variable warnings in donna's Curve25519 SSE2 code.
11249 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
11251 o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
11252 - When a circuit is marked for close, do not attempt to package any
11253 cells for channels on that circuit. Previously, we would detect
11254 this condition lower in the call stack, when we noticed that the
11255 circuit had no attached channel, and log an annoying message.
11256 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
11258 o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
11259 - Avoid a crash when transitioning from client mode to bridge mode.
11260 Previously, we would launch the worker threads whenever our
11261 "public server" mode changed, but not when our "server" mode
11262 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
11264 o Minor bugfixes (testing, backport from 0.3.1.6-rc):
11265 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
11266 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
11269 Changes in version 0.2.9.14 - 2017-12-01
11270 Tor 0.3.0.13 backports important security and stability bugfixes from
11271 later Tor releases. All Tor users should upgrade to this release, or
11272 to another of the releases coming out today.
11274 o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
11275 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
11276 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
11277 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
11278 identifying and finding a workaround to this bug and to Moritz,
11279 Arthur Edelstein, and Roger for helping to track it down and
11282 o Major bugfixes (security, backport from 0.3.2.6-alpha):
11283 - Fix a denial of service bug where an attacker could use a
11284 malformed directory object to cause a Tor instance to pause while
11285 OpenSSL would try to read a passphrase from the terminal. (Tor
11286 instances run without a terminal, which is the case for most Tor
11287 packages, are not impacted.) Fixes bug 24246; bugfix on every
11288 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
11289 Found by OSS-Fuzz as testcase 6360145429790720.
11290 - Fix a denial of service issue where an attacker could crash a
11291 directory authority using a malformed router descriptor. Fixes bug
11292 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
11294 - When checking for replays in the INTRODUCE1 cell data for a
11295 (legacy) onion service, correctly detect replays in the RSA-
11296 encrypted part of the cell. We were previously checking for
11297 replays on the entire cell, but those can be circumvented due to
11298 the malleability of Tor's legacy hybrid encryption. This fix helps
11299 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
11300 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
11303 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
11304 - Fix a use-after-free error that could crash v2 Tor onion services
11305 when they failed to open circuits while expiring introduction
11306 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
11307 also tracked as TROVE-2017-013 and CVE-2017-8823.
11309 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
11310 - When running as a relay, make sure that we never build a path
11311 through ourselves, even in the case where we have somehow lost the
11312 version of our descriptor appearing in the consensus. Fixes part
11313 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
11314 as TROVE-2017-012 and CVE-2017-8822.
11316 o Minor features (bridge, backport from 0.3.1.9):
11317 - Bridges now include notice in their descriptors that they are
11318 bridges, and notice of their distribution status, based on their
11319 publication settings. Implements ticket 18329. For more fine-
11320 grained control of how a bridge is distributed, upgrade to 0.3.2.x
11323 o Minor features (directory authority, backport from 0.3.2.6-alpha):
11324 - Add an IPv6 address for the "bastet" directory authority. Closes
11327 o Minor features (geoip):
11328 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
11331 o Minor features (security, windows, backport from 0.3.1.1-alpha):
11332 - Enable a couple of pieces of Windows hardening: one
11333 (HeapEnableTerminationOnCorruption) that has been on-by-default
11334 since Windows 8, and unavailable before Windows 7; and one
11335 (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
11336 affect us, but shouldn't do any harm. Closes ticket 21953.
11338 o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
11339 - Avoid unnecessary calls to directory_fetches_from_authorities() on
11340 relays, to prevent spurious address resolutions and descriptor
11341 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
11342 bugfix on in 0.2.8.1-alpha.
11344 o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
11345 - Fix unused variable warnings in donna's Curve25519 SSE2 code.
11346 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
11348 o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
11349 - When a circuit is marked for close, do not attempt to package any
11350 cells for channels on that circuit. Previously, we would detect
11351 this condition lower in the call stack, when we noticed that the
11352 circuit had no attached channel, and log an annoying message.
11353 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
11355 o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
11356 - Avoid a crash when transitioning from client mode to bridge mode.
11357 Previously, we would launch the worker threads whenever our
11358 "public server" mode changed, but not when our "server" mode
11359 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
11361 o Minor bugfixes (testing, backport from 0.3.1.6-rc):
11362 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
11363 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
11366 Changes in version 0.2.8.17 - 2017-12-01
11367 Tor 0.2.8.17 backports important security and stability bugfixes from
11368 later Tor releases. All Tor users should upgrade to this release, or
11369 to another of the releases coming out today.
11371 Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
11372 2018. If you need a release with long-term support, please upgrade with
11373 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
11375 o Major bugfixes (security, backport from 0.3.2.6-alpha):
11376 - Fix a denial of service bug where an attacker could use a
11377 malformed directory object to cause a Tor instance to pause while
11378 OpenSSL would try to read a passphrase from the terminal. (Tor
11379 instances run without a terminal, which is the case for most Tor
11380 packages, are not impacted.) Fixes bug 24246; bugfix on every
11381 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
11382 Found by OSS-Fuzz as testcase 6360145429790720.
11383 - When checking for replays in the INTRODUCE1 cell data for a
11384 (legacy) onion service, correctly detect replays in the RSA-
11385 encrypted part of the cell. We were previously checking for
11386 replays on the entire cell, but those can be circumvented due to
11387 the malleability of Tor's legacy hybrid encryption. This fix helps
11388 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
11389 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
11392 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
11393 - Fix a use-after-free error that could crash v2 Tor onion services
11394 when they failed to open circuits while expiring introduction
11395 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
11396 also tracked as TROVE-2017-013 and CVE-2017-8823.
11398 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
11399 - When running as a relay, make sure that we never build a path through
11400 ourselves, even in the case where we have somehow lost the version of
11401 our descriptor appearing in the consensus. Fixes part of bug 21534;
11402 bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
11405 o Minor features (bridge, backport from 0.3.1.9):
11406 - Bridges now include notice in their descriptors that they are
11407 bridges, and notice of their distribution status, based on their
11408 publication settings. Implements ticket 18329. For more fine-
11409 grained control of how a bridge is distributed, upgrade to 0.3.2.x
11412 o Minor features (directory authority, backport from 0.3.2.6-alpha):
11413 - Add an IPv6 address for the "bastet" directory authority. Closes
11416 o Minor features (geoip):
11417 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
11420 o Minor bugfixes (testing, backport from 0.3.1.6-rc):
11421 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
11422 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
11425 Changes in version 0.2.5.16 - 2017-12-01
11426 Tor 0.2.5.13 backports important security and stability bugfixes from
11427 later Tor releases. All Tor users should upgrade to this release, or
11428 to another of the releases coming out today.
11430 Note: the Tor 0.2.5 series will no longer be supported after 1 May
11431 2018. If you need a release with long-term support, please upgrade to
11432 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
11434 o Major bugfixes (security, backport from 0.3.2.6-alpha):
11435 - Fix a denial of service bug where an attacker could use a
11436 malformed directory object to cause a Tor instance to pause while
11437 OpenSSL would try to read a passphrase from the terminal. (Tor
11438 instances run without a terminal, which is the case for most Tor
11439 packages, are not impacted.) Fixes bug 24246; bugfix on every
11440 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
11441 Found by OSS-Fuzz as testcase 6360145429790720.
11442 - When checking for replays in the INTRODUCE1 cell data for a
11443 (legacy) onion service, correctly detect replays in the RSA-
11444 encrypted part of the cell. We were previously checking for
11445 replays on the entire cell, but those can be circumvented due to
11446 the malleability of Tor's legacy hybrid encryption. This fix helps
11447 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
11448 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
11451 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
11452 - When running as a relay, make sure that we never build a path
11453 through ourselves, even in the case where we have somehow lost the
11454 version of our descriptor appearing in the consensus. Fixes part
11455 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
11456 as TROVE-2017-012 and CVE-2017-8822.
11458 o Minor features (bridge, backport from 0.3.1.9):
11459 - Bridges now include notice in their descriptors that they are
11460 bridges, and notice of their distribution status, based on their
11461 publication settings. Implements ticket 18329. For more fine-
11462 grained control of how a bridge is distributed, upgrade to 0.3.2.x
11465 o Minor features (geoip):
11466 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
11470 Changes in version 0.2.5.15 - 2017-10-25
11471 Tor 0.2.5.15 backports a collection of bugfixes from later Tor release
11472 series. It also adds a new directory authority, Bastet.
11474 Note: the Tor 0.2.5 series will no longer be supported after 1 May
11475 2018. If you need a release with long-term support, please upgrade to
11476 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
11478 o Directory authority changes:
11479 - Add "Bastet" as a ninth directory authority to the default list.
11480 Closes ticket 23910.
11481 - The directory authority "Longclaw" has changed its IP address.
11482 Closes ticket 23592.
11484 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
11485 - Avoid an assertion failure bug affecting our implementation of
11486 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
11487 handling of "0xx" differs from what we had expected. Fixes bug
11488 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
11490 o Minor features (geoip):
11491 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
11494 o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
11495 - Fix a memset() off the end of an array when packing cells. This
11496 bug should be harmless in practice, since the corrupted bytes are
11497 still in the same structure, and are always padding bytes,
11498 ignored, or immediately overwritten, depending on compiler
11499 behavior. Nevertheless, because the memset()'s purpose is to make
11500 sure that any other cell-handling bugs can't expose bytes to the
11501 network, we need to fix it. Fixes bug 22737; bugfix on
11502 0.2.4.11-alpha. Fixes CID 1401591.
11504 o Build features (backport from 0.3.1.5-alpha):
11505 - Tor's repository now includes a Travis Continuous Integration (CI)
11506 configuration file (.travis.yml). This is meant to help new
11507 developers and contributors who fork Tor to a Github repository be
11508 better able to test their changes, and understand what we expect
11509 to pass. To use this new build feature, you must fork Tor to your
11510 Github account, then go into the "Integrations" menu in the
11511 repository settings for your fork and enable Travis, then push
11512 your changes. Closes ticket 22636.
11515 Changes in version 0.2.8.16 - 2017-10-25
11516 Tor 0.2.8.16 backports a collection of bugfixes from later Tor release
11517 series, including a bugfix for a crash issue that had affected relays
11518 under memory pressure. It also adds a new directory authority, Bastet.
11520 Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
11521 2018. If you need a release with long-term support, please stick with
11522 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
11524 o Directory authority changes:
11525 - Add "Bastet" as a ninth directory authority to the default list.
11526 Closes ticket 23910.
11527 - The directory authority "Longclaw" has changed its IP address.
11528 Closes ticket 23592.
11530 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
11531 - Fix a timing-based assertion failure that could occur when the
11532 circuit out-of-memory handler freed a connection's output buffer.
11533 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
11535 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
11536 - Remove longclaw's IPv6 address, as it will soon change. Authority
11537 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
11538 3/8 directory authorities with IPv6 addresses, but there are also
11539 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
11541 o Minor features (geoip):
11542 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
11546 Changes in version 0.2.9.13 - 2017-10-25
11547 Tor 0.2.9.13 backports a collection of bugfixes from later Tor release
11548 series, including a bugfix for a crash issue that had affected relays
11549 under memory pressure. It also adds a new directory authority, Bastet.
11551 o Directory authority changes:
11552 - Add "Bastet" as a ninth directory authority to the default list.
11553 Closes ticket 23910.
11554 - The directory authority "Longclaw" has changed its IP address.
11555 Closes ticket 23592.
11557 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
11558 - Fix a timing-based assertion failure that could occur when the
11559 circuit out-of-memory handler freed a connection's output buffer.
11560 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
11562 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
11563 - Remove longclaw's IPv6 address, as it will soon change. Authority
11564 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
11565 3/8 directory authorities with IPv6 addresses, but there are also
11566 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
11568 o Minor features (geoip):
11569 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
11572 o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
11573 - When a directory authority rejects a descriptor or extrainfo with
11574 a given digest, mark that digest as undownloadable, so that we do
11575 not attempt to download it again over and over. We previously
11576 tried to avoid downloading such descriptors by other means, but we
11577 didn't notice if we accidentally downloaded one anyway. This
11578 behavior became problematic in 0.2.7.2-alpha, when authorities
11579 began pinning Ed25519 keys. Fixes bug 22349; bugfix
11582 o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
11583 - Clear the address when node_get_prim_orport() returns early.
11584 Fixes bug 23874; bugfix on 0.2.8.2-alpha.
11586 o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
11587 - When running as a Windows service, set the ID of the main thread
11588 correctly. Failure to do so made us fail to send log messages to
11589 the controller in 0.2.1.16-rc, slowed down controller event
11590 delivery in 0.2.7.3-rc and later, and crash with an assertion
11591 failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
11592 Patch and diagnosis from "Vort".
11595 Changes in version 0.3.0.12 - 2017-10-25
11596 Tor 0.3.0.12 backports a collection of bugfixes from later Tor release
11597 series, including a bugfix for a crash issue that had affected relays
11598 under memory pressure. It also adds a new directory authority, Bastet.
11600 Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
11601 2018. If you need a release with long-term support, please stick with
11602 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
11604 o Directory authority changes:
11605 - Add "Bastet" as a ninth directory authority to the default list.
11606 Closes ticket 23910.
11607 - The directory authority "Longclaw" has changed its IP address.
11608 Closes ticket 23592.
11610 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
11611 - Fix a timing-based assertion failure that could occur when the
11612 circuit out-of-memory handler freed a connection's output buffer.
11613 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
11615 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
11616 - Remove longclaw's IPv6 address, as it will soon change. Authority
11617 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
11618 3/8 directory authorities with IPv6 addresses, but there are also
11619 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
11621 o Minor features (geoip):
11622 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
11625 o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
11626 - When a directory authority rejects a descriptor or extrainfo with
11627 a given digest, mark that digest as undownloadable, so that we do
11628 not attempt to download it again over and over. We previously
11629 tried to avoid downloading such descriptors by other means, but we
11630 didn't notice if we accidentally downloaded one anyway. This
11631 behavior became problematic in 0.2.7.2-alpha, when authorities
11632 began pinning Ed25519 keys. Fixes bug 22349; bugfix
11635 o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
11636 - Avoid a possible double close of a circuit by the intro point on
11637 error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
11638 bugfix on 0.3.0.1-alpha.
11640 o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
11641 - Clear the address when node_get_prim_orport() returns early.
11642 Fixes bug 23874; bugfix on 0.2.8.2-alpha.
11644 o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
11645 - When running as a Windows service, set the ID of the main thread
11646 correctly. Failure to do so made us fail to send log messages to
11647 the controller in 0.2.1.16-rc, slowed down controller event
11648 delivery in 0.2.7.3-rc and later, and crash with an assertion
11649 failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
11650 Patch and diagnosis from "Vort".
11653 Changes in version 0.3.1.8 - 2017-10-25
11654 Tor 0.3.1.8 is the second stable release in the 0.3.1 series.
11655 It includes several bugfixes, including a bugfix for a crash issue
11656 that had affected relays under memory pressure. It also adds
11657 a new directory authority, Bastet.
11659 o Directory authority changes:
11660 - Add "Bastet" as a ninth directory authority to the default list.
11661 Closes ticket 23910.
11662 - The directory authority "Longclaw" has changed its IP address.
11663 Closes ticket 23592.
11665 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
11666 - Fix a timing-based assertion failure that could occur when the
11667 circuit out-of-memory handler freed a connection's output buffer.
11668 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
11670 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
11671 - Remove longclaw's IPv6 address, as it will soon change. Authority
11672 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
11673 3/8 directory authorities with IPv6 addresses, but there are also
11674 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
11676 o Minor features (geoip):
11677 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
11680 o Minor bugfixes (compilation, backport from 0.3.2.2-alpha):
11681 - Fix a compilation warning when building with zstd support on
11682 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
11683 and fixed by Andreas Stieger.
11685 o Minor bugfixes (compression, backport from 0.3.2.2-alpha):
11686 - Handle a pathological case when decompressing Zstandard data when
11687 the output buffer size is zero. Fixes bug 23551; bugfix
11690 o Minor bugfixes (directory authority, backport from 0.3.2.1-alpha):
11691 - Remove the length limit on HTTP status lines that authorities can
11692 send in their replies. Fixes bug 23499; bugfix on 0.3.1.6-rc.
11694 o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
11695 - Avoid a possible double close of a circuit by the intro point on
11696 error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
11697 bugfix on 0.3.0.1-alpha.
11699 o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
11700 - Clear the address when node_get_prim_orport() returns early.
11701 Fixes bug 23874; bugfix on 0.2.8.2-alpha.
11703 o Minor bugfixes (unit tests, backport from 0.3.2.2-alpha):
11704 - Fix additional channelpadding unit test failures by using mocked
11705 time instead of actual time for all tests. Fixes bug 23608; bugfix
11709 Changes in version 0.2.8.15 - 2017-09-18
11710 Tor 0.2.8.15 backports a collection of bugfixes from later
11713 Most significantly, it includes a fix for TROVE-2017-008, a
11714 security bug that affects hidden services running with the
11715 SafeLogging option disabled. For more information, see
11716 https://trac.torproject.org/projects/tor/ticket/23490
11718 Note that Tor 0.2.8.x will no longer be supported after 1 Jan
11719 2018. We suggest that you upgrade to the latest stable release if
11720 possible. If you can't, we recommend that you upgrade at least to
11721 0.2.9, which will be supported until 2020.
11723 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
11724 - Avoid an assertion failure bug affecting our implementation of
11725 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
11726 handling of "0xx" differs from what we had expected. Fixes bug
11727 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
11730 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
11733 o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
11734 - Backport a fix for an "unused variable" warning that appeared
11735 in some versions of mingw. Fixes bug 22838; bugfix on
11738 o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
11739 - Fix a memset() off the end of an array when packing cells. This
11740 bug should be harmless in practice, since the corrupted bytes are
11741 still in the same structure, and are always padding bytes,
11742 ignored, or immediately overwritten, depending on compiler
11743 behavior. Nevertheless, because the memset()'s purpose is to make
11744 sure that any other cell-handling bugs can't expose bytes to the
11745 network, we need to fix it. Fixes bug 22737; bugfix on
11746 0.2.4.11-alpha. Fixes CID 1401591.
11748 o Build features (backport from 0.3.1.5-alpha):
11749 - Tor's repository now includes a Travis Continuous Integration (CI)
11750 configuration file (.travis.yml). This is meant to help new
11751 developers and contributors who fork Tor to a Github repository be
11752 better able to test their changes, and understand what we expect
11753 to pass. To use this new build feature, you must fork Tor to your
11754 Github account, then go into the "Integrations" menu in the
11755 repository settings for your fork and enable Travis, then push
11756 your changes. Closes ticket 22636.
11759 Changes in version 0.2.9.12 - 2017-09-18
11760 Tor 0.2.9.12 backports a collection of bugfixes from later
11763 Most significantly, it includes a fix for TROVE-2017-008, a
11764 security bug that affects hidden services running with the
11765 SafeLogging option disabled. For more information, see
11766 https://trac.torproject.org/projects/tor/ticket/23490
11768 o Major features (security, backport from 0.3.0.2-alpha):
11769 - Change the algorithm used to decide DNS TTLs on client and server
11770 side, to better resist DNS-based correlation attacks like the
11771 DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
11772 Feamster. Now relays only return one of two possible DNS TTL
11773 values, and clients are willing to believe DNS TTL values up to 3
11774 hours long. Closes ticket 19769.
11776 o Major bugfixes (crash, directory connections, backport from 0.3.0.5-rc):
11777 - Fix a rare crash when sending a begin cell on a circuit whose
11778 linked directory connection had already been closed. Fixes bug
11779 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
11781 o Major bugfixes (DNS, backport from 0.3.0.2-alpha):
11782 - Fix a bug that prevented exit nodes from caching DNS records for
11783 more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
11785 o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
11786 - Fix a typo that had prevented TPROXY-based transparent proxying
11787 from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
11788 Patch from "d4fq0fQAgoJ".
11790 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
11791 - Avoid an assertion failure bug affecting our implementation of
11792 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
11793 handling of "0xx" differs from what we had expected. Fixes bug
11794 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
11796 o Minor features (code style, backport from 0.3.1.3-alpha):
11797 - Add "Falls through" comments to our codebase, in order to silence
11798 GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
11799 Stieger. Closes ticket 22446.
11801 o Minor features (geoip):
11802 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
11805 o Minor bugfixes (bandwidth accounting, backport from 0.3.1.1-alpha):
11806 - Roll over monthly accounting at the configured hour and minute,
11807 rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
11808 Found by Andrey Karpov with PVS-Studio.
11810 o Minor bugfixes (compilation, backport from 0.3.1.5-alpha):
11811 - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
11812 bugfix on 0.2.8.1-alpha.
11813 - Fix warnings when building with libscrypt and openssl scrypt support
11814 on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
11815 - When building with certain versions the mingw C header files, avoid
11816 float-conversion warnings when calling the C functions isfinite(),
11817 isnan(), and signbit(). Fixes bug 22801; bugfix on 0.2.8.1-alpha.
11819 o Minor bugfixes (compilation, backport from 0.3.1.7):
11820 - Avoid compiler warnings in the unit tests for running tor_sscanf()
11821 with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
11823 o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
11824 - Backport a fix for an "unused variable" warning that appeared
11825 in some versions of mingw. Fixes bug 22838; bugfix on
11828 o Minor bugfixes (controller, backport from 0.3.1.7):
11829 - Do not crash when receiving a HSPOST command with an empty body.
11830 Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
11831 - Do not crash when receiving a POSTDESCRIPTOR command with an
11832 empty body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
11834 o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
11835 - Avoid Coverity build warnings related to our BUG() macro. By
11836 default, Coverity treats BUG() as the Linux kernel does: an
11837 instant abort(). We need to override that so our BUG() macro
11838 doesn't prevent Coverity from analyzing functions that use it.
11839 Fixes bug 23030; bugfix on 0.2.9.1-alpha.
11841 o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
11842 - Fix a memset() off the end of an array when packing cells. This
11843 bug should be harmless in practice, since the corrupted bytes are
11844 still in the same structure, and are always padding bytes,
11845 ignored, or immediately overwritten, depending on compiler
11846 behavior. Nevertheless, because the memset()'s purpose is to make
11847 sure that any other cell-handling bugs can't expose bytes to the
11848 network, we need to fix it. Fixes bug 22737; bugfix on
11849 0.2.4.11-alpha. Fixes CID 1401591.
11851 o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
11852 - When setting the maximum number of connections allowed by the OS,
11853 always allow some extra file descriptors for other files. Fixes
11854 bug 22797; bugfix on 0.2.0.10-alpha.
11856 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
11857 - Avoid a sandbox failure when trying to re-bind to a socket and
11858 mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
11860 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
11861 - Permit the fchmod system call, to avoid crashing on startup when
11862 starting with the seccomp2 sandbox and an unexpected set of
11863 permissions on the data directory or its contents. Fixes bug
11864 22516; bugfix on 0.2.5.4-alpha.
11866 o Minor bugfixes (relay, backport from 0.3.0.5-rc):
11867 - Avoid a double-marked-circuit warning that could happen when we
11868 receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
11871 o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
11872 - Reject version numbers with non-numeric prefixes (such as +, -, or
11873 whitespace). Disallowing whitespace prevents differential version
11874 parsing between POSIX-based and Windows platforms. Fixes bug 21507
11875 and part of 21508; bugfix on 0.0.8pre1.
11877 o Build features (backport from 0.3.1.5-alpha):
11878 - Tor's repository now includes a Travis Continuous Integration (CI)
11879 configuration file (.travis.yml). This is meant to help new
11880 developers and contributors who fork Tor to a Github repository be
11881 better able to test their changes, and understand what we expect
11882 to pass. To use this new build feature, you must fork Tor to your
11883 Github account, then go into the "Integrations" menu in the
11884 repository settings for your fork and enable Travis, then push
11885 your changes. Closes ticket 22636.
11888 Changes in version 0.3.0.11 - 2017-09-18
11889 Tor 0.3.0.11 backports a collection of bugfixes from Tor the 0.3.1
11892 Most significantly, it includes a fix for TROVE-2017-008, a
11893 security bug that affects hidden services running with the
11894 SafeLogging option disabled. For more information, see
11895 https://trac.torproject.org/projects/tor/ticket/23490
11897 o Minor features (code style, backport from 0.3.1.7):
11898 - Add "Falls through" comments to our codebase, in order to silence
11899 GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
11900 Stieger. Closes ticket 22446.
11903 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
11906 o Minor bugfixes (compilation, backport from 0.3.1.7):
11907 - Avoid compiler warnings in the unit tests for calling tor_sscanf()
11908 with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
11910 o Minor bugfixes (controller, backport from 0.3.1.7):
11911 - Do not crash when receiving a HSPOST command with an empty body.
11912 Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
11913 - Do not crash when receiving a POSTDESCRIPTOR command with an empty
11914 body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
11916 o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
11917 - When setting the maximum number of connections allowed by the OS,
11918 always allow some extra file descriptors for other files. Fixes
11919 bug 22797; bugfix on 0.2.0.10-alpha.
11921 o Minor bugfixes (logging, relay, backport from 0.3.1.6-rc):
11922 - Remove a forgotten debugging message when an introduction point
11923 successfully establishes a hidden service prop224 circuit with
11925 - Change three other log_warn() for an introduction point to
11926 protocol warnings, because they can be failure from the network
11927 and are not relevant to the operator. Fixes bug 23078; bugfix on
11928 0.3.0.1-alpha and 0.3.0.2-alpha.
11931 Changes in version 0.3.1.7 - 2017-09-18
11932 Tor 0.3.1.7 is the first stable release in the 0.3.1 series.
11934 With the 0.3.1 series, Tor now serves and downloads directory
11935 information in more compact formats, to save on bandwidth overhead. It
11936 also contains a new padding system to resist netflow-based traffic
11937 analysis, and experimental support for building parts of Tor in Rust
11938 (though no parts of Tor are in Rust yet). There are also numerous
11939 small features, bugfixes on earlier release series, and groundwork for
11940 the hidden services revamp of 0.3.2.
11942 This release also includes a fix for TROVE-2017-008, a security bug
11943 that affects hidden services running with the SafeLogging option
11944 disabled. For more information, see
11945 https://trac.torproject.org/projects/tor/ticket/23490
11947 Per our stable release policy, we plan to support each stable release
11948 series for at least the next nine months, or for three months after
11949 the first stable release of the next series: whichever is longer. If
11950 you need a release with long-term support, we recommend that you stay
11951 with the 0.2.9 series.
11953 Below is a list of the changes since 0.3.0. For a list of all
11954 changes since 0.3.1.6-rc, see the ChangeLog file.
11956 o New dependencies:
11957 - To build with zstd and lzma support, Tor now requires the
11958 pkg-config tool at build time.
11960 o Major bugfixes (security, hidden services, loggging):
11961 - Fix a bug where we could log uninitialized stack when a certain
11962 hidden service error occurred while SafeLogging was disabled.
11963 Fixes bug #23490; bugfix on 0.2.7.2-alpha.
11964 This is also tracked as TROVE-2017-008 and CVE-2017-0380.
11966 o Major features (build system, continuous integration):
11967 - Tor's repository now includes a Travis Continuous Integration (CI)
11968 configuration file (.travis.yml). This is meant to help new
11969 developers and contributors who fork Tor to a Github repository be
11970 better able to test their changes, and understand what we expect
11971 to pass. To use this new build feature, you must fork Tor to your
11972 Github account, then go into the "Integrations" menu in the
11973 repository settings for your fork and enable Travis, then push
11974 your changes. Closes ticket 22636.
11976 o Major features (directory protocol):
11977 - Tor relays and authorities can now serve clients an abbreviated
11978 version of the consensus document, containing only the changes
11979 since an older consensus document that the client holds. Clients
11980 now request these documents when available. When both client and
11981 server use this new protocol, they will use far less bandwidth (up
11982 to 94% less) to keep the client's consensus up-to-date. Implements
11983 proposal 140; closes ticket 13339. Based on work by Daniel Martí.
11984 - Tor can now compress directory traffic with lzma or with zstd
11985 compression algorithms, which can deliver better bandwidth
11986 performance. Because lzma is computationally expensive, it's only
11987 used for documents that can be compressed once and served many
11988 times. Support for these algorithms requires that tor is built
11989 with the libzstd and/or liblzma libraries available. Implements
11990 proposal 278; closes ticket 21662.
11991 - Relays now perform the more expensive compression operations, and
11992 consensus diff generation, in worker threads. This separation
11993 avoids delaying the main thread when a new consensus arrives.
11995 o Major features (experimental):
11996 - Tor can now build modules written in Rust. To turn this on, pass
11997 the "--enable-rust" flag to the configure script. It's not time to
11998 get excited yet: currently, there is no actual Rust functionality
11999 beyond some simple glue code, and a notice at startup to tell you
12000 that Rust is running. Still, we hope that programmers and
12001 packagers will try building Tor with Rust support, so that we can
12002 find issues and solve portability problems. Closes ticket 22106.
12004 o Major features (traffic analysis resistance):
12005 - Connections between clients and relays now send a padding cell in
12006 each direction every 1.5 to 9.5 seconds (tunable via consensus
12007 parameters). This padding will not resist specialized
12008 eavesdroppers, but it should be enough to make many ISPs' routine
12009 network flow logging less useful in traffic analysis against
12012 Padding is negotiated using Tor's link protocol, so both relays
12013 and clients must upgrade for this to take effect. Clients may
12014 still send padding despite the relay's version by setting
12015 ConnectionPadding 1 in torrc, and may disable padding by setting
12016 ConnectionPadding 0 in torrc. Padding may be minimized for mobile
12017 users with the torrc option ReducedConnectionPadding. Implements
12018 Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
12019 - Relays will publish 24 hour totals of padding and non-padding cell
12020 counts to their extra-info descriptors, unless PaddingStatistics 0
12021 is set in torrc. These 24 hour totals are also rounded to
12022 multiples of 10000.
12024 o Major bugfixes (hidden service, relay, security):
12025 - Fix a remotely triggerable assertion failure when a hidden service
12026 handles a malformed BEGIN cell. Fixes bug 22493, tracked as
12027 TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
12028 - Fix a remotely triggerable assertion failure caused by receiving a
12029 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12030 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12033 o Major bugfixes (path selection, security):
12034 - When choosing which guard to use for a circuit, avoid the exit's
12035 family along with the exit itself. Previously, the new guard
12036 selection logic avoided the exit, but did not consider its family.
12037 Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
12038 006 and CVE-2017-0377.
12040 o Major bugfixes (connection usage):
12041 - We use NETINFO cells to try to determine if both relays involved
12042 in a connection will agree on the canonical status of that
12043 connection. We prefer the connections where this is the case for
12044 extend cells, and try to close connections where relays disagree
12045 on their canonical status early. Also, we now prefer the oldest
12046 valid connection for extend cells. These two changes should reduce
12047 the number of long-term connections that are kept open between
12048 relays. Fixes bug 17604; bugfix on 0.2.5.5-alpha.
12049 - Relays now log hourly statistics (look for
12050 "channel_check_for_duplicates" lines) on the total number of
12051 connections to other relays. If the number of connections per
12052 relay is unexpectedly large, this log message is at notice level.
12053 Otherwise it is at info.
12055 o Major bugfixes (entry guards):
12056 - When starting with an old consensus, do not add new entry guards
12057 unless the consensus is "reasonably live" (under 1 day old). Fixes
12058 one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
12059 - Don't block bootstrapping when a primary bridge is offline and we
12060 can't get its descriptor. Fixes bug 22325; fixes one case of bug
12061 21969; bugfix on 0.3.0.3-alpha.
12063 o Major bugfixes (linux TPROXY support):
12064 - Fix a typo that had prevented TPROXY-based transparent proxying
12065 from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
12066 Patch from "d4fq0fQAgoJ".
12068 o Major bugfixes (openbsd, denial-of-service):
12069 - Avoid an assertion failure bug affecting our implementation of
12070 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
12071 handling of "0xx" differs from what we had expected. Fixes bug
12072 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
12074 o Major bugfixes (relay, link handshake):
12075 - When performing the v3 link handshake on a TLS connection, report
12076 that we have the x509 certificate that we actually used on that
12077 connection, even if we have changed certificates since that
12078 connection was first opened. Previously, we would claim to have
12079 used our most recent x509 link certificate, which would sometimes
12080 make the link handshake fail. Fixes one case of bug 22460; bugfix
12083 o Major bugfixes (relays, key management):
12084 - Regenerate link and authentication certificates whenever the key
12085 that signs them changes; also, regenerate link certificates
12086 whenever the signed key changes. Previously, these processes were
12087 only weakly coupled, and we relays could (for minutes to hours)
12088 wind up with an inconsistent set of keys and certificates, which
12089 other relays would not accept. Fixes two cases of bug 22460;
12090 bugfix on 0.3.0.1-alpha.
12091 - When sending an Ed25519 signing->link certificate in a CERTS cell,
12092 send the certificate that matches the x509 certificate that we
12093 used on the TLS connection. Previously, there was a race condition
12094 if the TLS context rotated after we began the TLS handshake but
12095 before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
12098 o Minor features (security, windows):
12099 - Enable a couple of pieces of Windows hardening: one
12100 (HeapEnableTerminationOnCorruption) that has been on-by-default
12101 since Windows 8, and unavailable before Windows 7; and one
12102 (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
12103 affect us, but shouldn't do any harm. Closes ticket 21953.
12105 o Minor features (bridge authority):
12106 - Add "fingerprint" lines to the networkstatus-bridges file produced
12107 by bridge authorities. Closes ticket 22207.
12109 o Minor features (code style):
12110 - Add "Falls through" comments to our codebase, in order to silence
12111 GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
12112 Stieger. Closes ticket 22446.
12114 o Minor features (config options):
12115 - Allow "%include" directives in torrc configuration files. These
12116 directives import the settings from other files, or from all the
12117 files in a directory. Closes ticket 1922. Code by Daniel Pinto.
12118 - Make SAVECONF return an error when overwriting a torrc that has
12119 includes. Using SAVECONF with the FORCE option will allow it to
12120 overwrite torrc even if includes are used. Related to ticket 1922.
12121 - Add "GETINFO config-can-saveconf" to tell controllers if SAVECONF
12122 will work without the FORCE option. Related to ticket 1922.
12124 o Minor features (controller):
12125 - Warn the first time that a controller requests data in the long-
12126 deprecated 'GETINFO network-status' format. Closes ticket 21703.
12128 o Minor features (defaults):
12129 - The default value for UseCreateFast is now 0: clients which
12130 haven't yet received a consensus document will now use a proper
12131 ntor handshake to talk to their directory servers whenever they
12132 can. Closes ticket 21407.
12133 - Onion key rotation and expiry intervals are now defined as a
12134 network consensus parameter, per proposal 274. The default
12135 lifetime of an onion key is increased from 7 to 28 days. Old onion
12136 keys will expire after 7 days by default. This change will make
12137 consensus diffs much smaller, and save significant bandwidth.
12138 Closes ticket 21641.
12140 o Minor features (defensive programming):
12141 - Create a pair of consensus parameters, nf_pad_tor2web and
12142 nf_pad_single_onion, to disable netflow padding in the consensus
12143 for non-anonymous connections in case the overhead is high. Closes
12146 o Minor features (diagnostic):
12147 - Add a stack trace to the bug warnings that can be logged when
12148 trying to send an outgoing relay cell with n_chan == 0. Diagnostic
12149 attempt for bug 23105.
12150 - Add logging messages to try to diagnose a rare bug that seems to
12151 generate RSA->Ed25519 cross-certificates dated in the 1970s. We
12152 think this is happening because of incorrect system clocks, but
12153 we'd like to know for certain. Diagnostic for bug 22466.
12154 - Avoid an assertion failure, and log a better error message, when
12155 unable to remove a file from the consensus cache on Windows.
12156 Attempts to mitigate and diagnose bug 22752.
12158 o Minor features (directory authority):
12159 - Improve the message that authorities report to relays that present
12160 RSA/Ed25519 keypairs that conflict with previously pinned keys.
12161 Closes ticket 22348.
12163 o Minor features (directory cache, consensus diff):
12164 - Add a new MaxConsensusAgeForDiffs option to allow directory cache
12165 operators with low-resource environments to adjust the number of
12166 consensuses they'll store and generate diffs from. Most cache
12167 operators should leave it unchanged. Helps to work around
12170 o Minor features (fallback directory list):
12171 - Update the fallback directory mirror whitelist and blacklist based
12172 on operator emails. Closes task 21121.
12173 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
12174 December 2016 (of which ~126 were still functional) with a list of
12175 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
12176 2017. Resolves ticket 21564.
12178 o Minor features (geoip):
12179 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
12182 o Minor features (hidden services, logging):
12183 - Log a message when a hidden service descriptor has fewer
12184 introduction points than specified in
12185 HiddenServiceNumIntroductionPoints. Closes tickets 21598.
12186 - Log a message when a hidden service reaches its introduction point
12187 circuit limit, and when that limit is reset. Follow up to ticket
12188 21594; closes ticket 21622.
12189 - Warn user if multiple entries in EntryNodes and at least one
12190 HiddenService are used together. Pinning EntryNodes along with a
12191 hidden service can be possibly harmful; for instance see ticket
12192 14917 or 21155. Closes ticket 21155.
12194 o Minor features (linux seccomp2 sandbox):
12195 - We now have a document storage backend compatible with the Linux
12196 seccomp2 sandbox. This backend is used for consensus documents and
12197 diffs between them; in the long term, we'd like to use it for
12198 unparseable directory material too. Closes ticket 21645
12199 - Increase the maximum allowed size passed to mprotect(PROT_WRITE)
12200 from 1MB to 16MB. This was necessary with the glibc allocator in
12201 order to allow worker threads to allocate more memory -- which in
12202 turn is necessary because of our new use of worker threads for
12203 compression. Closes ticket 22096.
12205 o Minor features (logging):
12206 - Log files are no longer created world-readable by default.
12207 (Previously, most distributors would store the logs in a non-
12208 world-readable location to prevent inappropriate access. This
12209 change is an extra precaution.) Closes ticket 21729; patch
12212 o Minor features (performance):
12213 - Our Keccak (SHA-3) implementation now accesses memory more
12214 efficiently, especially on little-endian systems. Closes
12216 - Add an O(1) implementation of channel_find_by_global_id(), to
12217 speed some controller functions.
12219 o Minor features (relay, configuration):
12220 - The MyFamily option may now be repeated as many times as desired,
12221 for relays that want to configure large families. Closes ticket
12222 4998; patch by Daniel Pinto.
12224 o Minor features (relay, performance):
12225 - Always start relays with at least two worker threads, to prevent
12226 priority inversion on slow tasks. Part of the fix for bug 22883.
12227 - Allow background work to be queued with different priorities, so
12228 that a big pile of slow low-priority jobs will not starve out
12229 higher priority jobs. This lays the groundwork for a fix for
12232 o Minor features (safety):
12233 - Add an explicit check to extrainfo_parse_entry_from_string() for
12234 NULL inputs. We don't believe this can actually happen, but it may
12235 help silence a warning from the Clang analyzer. Closes
12238 o Minor features (testing):
12239 - Add more tests for compression backend initialization. Closes
12241 - Add a "--disable-memory-sentinels" feature to help with fuzzing.
12242 When Tor is compiled with this option, we disable a number of
12243 redundant memory-safety failsafes that are intended to stop bugs
12244 from becoming security issues. This makes it easier to hunt for
12245 bugs that would be security issues without the failsafes turned
12246 on. Closes ticket 21439.
12247 - Add a general event-tracing instrumentation support to Tor. This
12248 subsystem will enable developers and researchers to add fine-
12249 grained instrumentation to their Tor instances, for use when
12250 examining Tor network performance issues. There are no trace
12251 events yet, and event-tracing is off by default unless enabled at
12252 compile time. Implements ticket 13802.
12253 - Improve our version parsing tests: add tests for typical version
12254 components, add tests for invalid versions, including numeric
12255 range and non-numeric prefixes. Unit tests 21278, 21450, and
12256 21507. Partially implements 21470.
12258 o Minor bugfixes (bandwidth accounting):
12259 - Roll over monthly accounting at the configured hour and minute,
12260 rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
12261 Found by Andrey Karpov with PVS-Studio.
12263 o Minor bugfixes (code correctness):
12264 - Accurately identify client connections by their lack of peer
12265 authentication. This means that we bail out earlier if asked to
12266 extend to a client. Follow-up to 21407. Fixes bug 21406; bugfix
12269 o Minor bugfixes (compilation warnings):
12270 - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug
12271 22915; bugfix on 0.2.8.1-alpha.
12272 - Fix warnings when building with libscrypt and openssl scrypt
12273 support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
12274 - When building with certain versions of the mingw C header files,
12275 avoid float-conversion warnings when calling the C functions
12276 isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
12279 o Minor bugfixes (compilation):
12280 - Avoid compiler warnings in the unit tests for calling tor_sscanf()
12281 with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
12283 o Minor bugfixes (compression):
12284 - When spooling compressed data to an output buffer, don't try to
12285 spool more data when there is no more data to spool and we are not
12286 trying to flush the input. Previously, we would sometimes launch
12287 compression requests with nothing to do, which interferes with our
12288 22672 checks. Fixes bug 22719; bugfix on 0.2.0.16-alpha.
12290 o Minor bugfixes (configuration):
12291 - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
12292 bug 22252; bugfix on 0.2.9.3-alpha.
12294 o Minor bugfixes (connection lifespan):
12295 - Allow more control over how long TLS connections are kept open:
12296 unify CircuitIdleTimeout and PredictedPortsRelevanceTime into a
12297 single option called CircuitsAvailableTimeout. Also, allow the
12298 consensus to control the default values for both this preference
12299 and the lifespan of relay-to-relay connections. Fixes bug 17592;
12300 bugfix on 0.2.5.5-alpha.
12301 - Increase the initial circuit build timeout testing frequency, to
12302 help ensure that ReducedConnectionPadding clients finish learning
12303 a timeout before their orconn would expire. The initial testing
12304 rate was set back in the days of TAP and before the Tor Browser
12305 updater, when we had to be much more careful about new clients
12306 making lots of circuits. With this change, a circuit build timeout
12307 is learned in about 15-20 minutes, instead of 100-120 minutes.
12309 o Minor bugfixes (controller):
12310 - Do not crash when receiving a HSPOST command with an empty body.
12311 Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
12312 - Do not crash when receiving a POSTDESCRIPTOR command with an empty
12313 body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
12314 - GETINFO onions/current and onions/detached no longer respond with
12315 551 on empty lists. Fixes bug 21329; bugfix on 0.2.7.1-alpha.
12316 - Trigger HS descriptor events on the control port when the client
12317 fails to pick a hidden service directory for a hidden service.
12318 This can happen if all the hidden service directories are in
12319 ExcludeNodes, or they have all been queried within the last 15
12320 minutes. Fixes bug 22042; bugfix on 0.2.5.2-alpha.
12322 o Minor bugfixes (correctness):
12323 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12324 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12326 o Minor bugfixes (coverity build support):
12327 - Avoid Coverity build warnings related to our BUG() macro. By
12328 default, Coverity treats BUG() as the Linux kernel does: an
12329 instant abort(). We need to override that so our BUG() macro
12330 doesn't prevent Coverity from analyzing functions that use it.
12331 Fixes bug 23030; bugfix on 0.2.9.1-alpha.
12333 o Minor bugfixes (defensive programming):
12334 - Detect and break out of infinite loops in our compression code. We
12335 don't think that any such loops exist now, but it's best to be
12336 safe. Closes ticket 22672.
12337 - Fix a memset() off the end of an array when packing cells. This
12338 bug should be harmless in practice, since the corrupted bytes are
12339 still in the same structure, and are always padding bytes,
12340 ignored, or immediately overwritten, depending on compiler
12341 behavior. Nevertheless, because the memset()'s purpose is to make
12342 sure that any other cell-handling bugs can't expose bytes to the
12343 network, we need to fix it. Fixes bug 22737; bugfix on
12344 0.2.4.11-alpha. Fixes CID 1401591.
12346 o Minor bugfixes (directory authority):
12347 - When a directory authority rejects a descriptor or extrainfo with
12348 a given digest, mark that digest as undownloadable, so that we do
12349 not attempt to download it again over and over. We previously
12350 tried to avoid downloading such descriptors by other means, but we
12351 didn't notice if we accidentally downloaded one anyway. This
12352 behavior became problematic in 0.2.7.2-alpha, when authorities
12353 began pinning Ed25519 keys. Fixes bug 22349; bugfix
12355 - When rejecting a router descriptor for running an obsolete version
12356 of Tor without ntor support, warn about the obsolete tor version,
12357 not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
12358 - Prevent the shared randomness subsystem from asserting when
12359 initialized by a bridge authority with an incomplete configuration
12360 file. Fixes bug 21586; bugfix on 0.2.9.8.
12362 o Minor bugfixes (error reporting, windows):
12363 - When formatting Windows error messages, use the English format to
12364 avoid codepage issues. Fixes bug 22520; bugfix on 0.1.2.8-alpha.
12367 o Minor bugfixes (exit-side DNS):
12368 - Fix an untriggerable assertion that checked the output of a
12369 libevent DNS error, so that the assertion actually behaves as
12370 expected. Fixes bug 22244; bugfix on 0.2.0.20-rc. Found by Andrey
12371 Karpov using PVS-Studio.
12373 o Minor bugfixes (fallback directories):
12374 - Make the usage example in updateFallbackDirs.py actually work, and
12375 explain what it does. Fixes bug 22270; bugfix on 0.3.0.3-alpha.
12376 - Decrease the guard flag average required to be a fallback. This
12377 allows us to keep relays that have their guard flag removed when
12378 they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
12379 - Decrease the minimum number of fallbacks to 100. Fixes bug 20913;
12380 bugfix on 0.2.8.1-alpha.
12381 - Make sure fallback directory mirrors have the same address, port,
12382 and relay identity key for at least 30 days before they are
12383 selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
12385 o Minor bugfixes (file limits, osx):
12386 - When setting the maximum number of connections allowed by the OS,
12387 always allow some extra file descriptors for other files. Fixes
12388 bug 22797; bugfix on 0.2.0.10-alpha.
12390 o Minor bugfixes (hidden services):
12391 - Increase the number of circuits that a service is allowed to
12392 open over a specific period of time. The value was lower than it
12393 should be (8 vs 12) in the normal case of 3 introduction points.
12394 Fixes bug 22159; bugfix on 0.3.0.5-rc.
12395 - Fix a BUG warning during HSv3 descriptor decoding that could be
12396 cause by a specially crafted descriptor. Fixes bug 23233; bugfix
12397 on 0.3.0.1-alpha. Bug found by "haxxpop".
12398 - Stop printing a cryptic warning when a hidden service gets a
12399 request to connect to a virtual port that it hasn't configured.
12400 Fixes bug 16706; bugfix on 0.2.6.3-alpha.
12401 - Simplify hidden service descriptor creation by using an existing
12402 flag to check if an introduction point is established. Fixes bug
12403 21599; bugfix on 0.2.7.2-alpha.
12405 o Minor bugfixes (link handshake):
12406 - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
12407 months, and regenerate it when it is within one month of expiring.
12408 Previously, we had generated this certificate at startup with a
12409 ten-year lifetime, but that could lead to weird behavior when Tor
12410 was started with a grossly inaccurate clock. Mitigates bug 22466;
12411 mitigation on 0.3.0.1-alpha.
12413 o Minor bugfixes (linux seccomp2 sandbox):
12414 - Avoid a sandbox failure when trying to re-bind to a socket and
12415 mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
12416 - Permit the fchmod system call, to avoid crashing on startup when
12417 starting with the seccomp2 sandbox and an unexpected set of
12418 permissions on the data directory or its contents. Fixes bug
12419 22516; bugfix on 0.2.5.4-alpha.
12421 o Minor bugfixes (logging):
12422 - When decompressing, do not warn if we fail to decompress using a
12423 compression method that we merely guessed. Fixes part of bug
12424 22670; bugfix on 0.1.1.14-alpha.
12425 - When decompressing, treat mismatch between content-encoding and
12426 actual compression type as a protocol warning. Fixes part of bug
12427 22670; bugfix on 0.1.1.9-alpha.
12428 - Downgrade "assigned_to_cpuworker failed" message to info-level
12429 severity. In every case that can reach it, either a better warning
12430 has already been logged, or no warning is warranted. Fixes bug
12431 22356; bugfix on 0.2.6.3-alpha.
12432 - Log a better message when a directory authority replies to an
12433 upload with an unexpected status code. Fixes bug 11121; bugfix
12435 - Downgrade a log statement about unexpected relay cells from "bug"
12436 to "protocol warning", because there is at least one use case
12437 where it can be triggered by a buggy tor implementation. Fixes bug
12438 21293; bugfix on 0.1.1.14-alpha.
12440 o Minor bugfixes (logging, relay):
12441 - Remove a forgotten debugging message when an introduction point
12442 successfully establishes a hidden service prop224 circuit with
12444 - Change three other log_warn() for an introduction point to
12445 protocol warnings, because they can be failure from the network
12446 and are not relevant to the operator. Fixes bug 23078; bugfix on
12447 0.3.0.1-alpha and 0.3.0.2-alpha.
12449 o Minor bugfixes (relay):
12450 - Inform the geoip and rephist modules about all requests, even on
12451 relays that are only fetching microdescriptors. Fixes a bug
12452 related to 21585; bugfix on 0.3.0.1-alpha.
12454 o Minor bugfixes (memory leaks):
12455 - Fix a small memory leak at exit from the backtrace handler code.
12456 Fixes bug 21788; bugfix on 0.2.5.2-alpha. Patch from Daniel Pinto.
12457 - When directory authorities reject a router descriptor due to
12458 keypinning, free the router descriptor rather than leaking the
12459 memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
12460 - Fix a small memory leak when validating a configuration that uses
12461 two or more AF_UNIX sockets for the same port type. Fixes bug
12462 23053; bugfix on 0.2.6.3-alpha. This is CID 1415725.
12464 o Minor bugfixes (process behavior):
12465 - When exiting because of an error, always exit with a nonzero exit
12466 status. Previously, we would fail to report an error in our exit
12467 status in cases related to __OwningControllerProcess failure,
12468 lockfile contention, and Ed25519 key initialization. Fixes bug
12469 22720; bugfix on versions 0.2.1.6-alpha, 0.2.2.28-beta, and
12470 0.2.7.2-alpha respectively. Reported by "f55jwk4f"; patch
12473 o Minor bugfixes (robustness, error handling):
12474 - Improve our handling of the cases where OpenSSL encounters a
12475 memory error while encoding keys and certificates. We haven't
12476 observed these errors in the wild, but if they do happen, we now
12477 detect and respond better. Fixes bug 19418; bugfix on all versions
12478 of Tor. Reported by Guido Vranken.
12480 o Minor bugfixes (testing):
12481 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
12482 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
12483 - Use unbuffered I/O for utility functions around the
12484 process_handle_t type. This fixes unit test failures reported on
12485 OpenBSD and FreeBSD. Fixes bug 21654; bugfix on 0.2.3.1-alpha.
12486 - Make display of captured unit test log messages consistent. Fixes
12487 bug 21510; bugfix on 0.2.9.3-alpha.
12488 - Make test-network.sh always call chutney's test-network.sh.
12489 Previously, this only worked on systems which had bash installed,
12490 due to some bash-specific code in the script. Fixes bug 19699;
12491 bugfix on 0.3.0.4-rc. Follow-up to ticket 21581.
12492 - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
12493 Fixes bug 22803; bugfix on 0.3.0.1-alpha.
12494 - The unit tests now pass on systems where localhost is misconfigured
12495 to some IPv4 address other than 127.0.0.1. Fixes bug 6298; bugfix
12498 o Minor bugfixes (voting consistency):
12499 - Reject version numbers with non-numeric prefixes (such as +, -, or
12500 whitespace). Disallowing whitespace prevents differential version
12501 parsing between POSIX-based and Windows platforms. Fixes bug 21507
12502 and part of 21508; bugfix on 0.0.8pre1.
12504 o Minor bugfixes (Windows service):
12505 - When running as a Windows service, set the ID of the main thread
12506 correctly. Failure to do so made us fail to send log messages to
12507 the controller in 0.2.1.16-rc, slowed down controller event
12508 delivery in 0.2.7.3-rc and later, and crash with an assertion
12509 failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
12510 Patch and diagnosis from "Vort".
12512 o Minor bugfixes (windows, relay):
12513 - Resolve "Failure from drain_fd: No error" warnings on Windows
12514 relays. Fixes bug 21540; bugfix on 0.2.6.3-alpha.
12516 o Code simplification and refactoring:
12517 - Break up the 630-line function connection_dir_client_reached_eof()
12518 into a dozen smaller functions. This change should help
12519 maintainability and readability of the client directory code.
12520 - Isolate our use of the openssl headers so that they are only
12521 included from our crypto wrapper modules, and from tests that
12522 examine those modules' internals. Closes ticket 21841.
12523 - Simplify our API to launch directory requests, making it more
12524 extensible and less error-prone. Now it's easier to add extra
12525 headers to directory requests. Closes ticket 21646.
12526 - Our base64 decoding functions no longer overestimate the output
12527 space that they need when parsing unpadded inputs. Closes
12529 - Remove unused "ROUTER_ADDED_NOTIFY_GENERATOR" internal value.
12530 Resolves ticket 22213.
12531 - The logic that directory caches use to spool request to clients,
12532 serving them one part at a time so as not to allocate too much
12533 memory, has been refactored for consistency. Previously there was
12534 a separate spooling implementation per type of spoolable data. Now
12535 there is one common spooling implementation, with extensible data
12536 types. Closes ticket 21651.
12537 - Tor's compression module now supports multiple backends. Part of
12538 the implementation for proposal 278; closes ticket 21663.
12541 - Add a manpage description for the key-pinning-journal file. Closes
12543 - Correctly note that bandwidth accounting values are stored in the
12544 state file, and the bw_accounting file is now obsolete. Closes
12546 - Document more of the files in the Tor data directory, including
12547 cached-extrainfo, secret_onion_key{,_ntor}.old, hidserv-stats,
12548 approved-routers, sr-random, and diff-cache. Found while fixing
12550 - Clarify the manpage for the (deprecated) torify script. Closes
12552 - Clarify the behavior of the KeepAliveIsolateSOCKSAuth sub-option.
12553 Closes ticket 21873.
12554 - Correct documentation about the default DataDirectory value.
12555 Closes ticket 21151.
12556 - Document the default behavior of NumEntryGuards and
12557 NumDirectoryGuards correctly. Fixes bug 21715; bugfix
12559 - Document key=value pluggable transport arguments for Bridge lines
12560 in torrc. Fixes bug 20341; bugfix on 0.2.5.1-alpha.
12561 - Note that bandwidth-limiting options don't affect TCP headers or
12562 DNS. Closes ticket 17170.
12564 o Removed features (configuration options, all in ticket 22060):
12565 - These configuration options are now marked Obsolete, and no longer
12566 have any effect: AllowInvalidNodes, AllowSingleHopCircuits,
12567 AllowSingleHopExits, ExcludeSingleHopRelays, FastFirstHopPK,
12568 TLSECGroup, WarnUnsafeSocks. They were first marked as deprecated
12569 in 0.2.9.2-alpha and have now been removed. The previous default
12570 behavior is now always chosen; the previous (less secure) non-
12571 default behavior is now unavailable.
12572 - CloseHSClientCircuitsImmediatelyOnTimeout and
12573 CloseHSServiceRendCircuitsImmediatelyOnTimeout were deprecated in
12574 0.2.9.2-alpha and now have been removed. HS circuits never close
12575 on circuit build timeout; they have a longer timeout period.
12576 - {Control,DNS,Dir,Socks,Trans,NATD,OR}ListenAddress were deprecated
12577 in 0.2.9.2-alpha and now have been removed. Use the ORPort option
12578 (and others) to configure listen-only and advertise-only addresses.
12580 o Removed features (tools):
12581 - We've removed the tor-checkkey tool from src/tools. Long ago, we
12582 used it to help people detect RSA keys that were generated by
12583 versions of Debian affected by CVE-2008-0166. But those keys have
12584 been out of circulation for ages, and this tool is no longer
12585 required. Closes ticket 21842.
12588 Changes in version 0.3.0.10 - 2017-08-02
12589 Tor 0.3.0.10 backports a collection of small-to-medium bugfixes
12590 from the current Tor alpha series. OpenBSD users and TPROXY users
12591 should upgrade; others are probably okay sticking with 0.3.0.9.
12593 o Major features (build system, continuous integration, backport from 0.3.1.5-alpha):
12594 - Tor's repository now includes a Travis Continuous Integration (CI)
12595 configuration file (.travis.yml). This is meant to help new
12596 developers and contributors who fork Tor to a Github repository be
12597 better able to test their changes, and understand what we expect
12598 to pass. To use this new build feature, you must fork Tor to your
12599 Github account, then go into the "Integrations" menu in the
12600 repository settings for your fork and enable Travis, then push
12601 your changes. Closes ticket 22636.
12603 o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
12604 - Fix a typo that had prevented TPROXY-based transparent proxying
12605 from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
12606 Patch from "d4fq0fQAgoJ".
12608 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
12609 - Avoid an assertion failure bug affecting our implementation of
12610 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
12611 handling of "0xbar" differs from what we had expected. Fixes bug
12612 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
12614 o Minor features (backport from 0.3.1.5-alpha):
12615 - Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
12618 o Minor bugfixes (bandwidth accounting, backport from 0.3.1.2-alpha):
12619 - Roll over monthly accounting at the configured hour and minute,
12620 rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
12621 Found by Andrey Karpov with PVS-Studio.
12623 o Minor bugfixes (compilation warnings, backport from 0.3.1.5-alpha):
12624 - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
12625 bugfix on 0.2.8.1-alpha.
12626 - Fix warnings when building with libscrypt and openssl scrypt
12627 support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
12628 - When building with certain versions of the mingw C header files,
12629 avoid float-conversion warnings when calling the C functions
12630 isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
12633 o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
12634 - Backport a fix for an "unused variable" warning that appeared
12635 in some versions of mingw. Fixes bug 22838; bugfix on
12638 o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
12639 - Avoid Coverity build warnings related to our BUG() macro. By
12640 default, Coverity treats BUG() as the Linux kernel does: an
12641 instant abort(). We need to override that so our BUG() macro
12642 doesn't prevent Coverity from analyzing functions that use it.
12643 Fixes bug 23030; bugfix on 0.2.9.1-alpha.
12645 o Minor bugfixes (directory authority, backport from 0.3.1.1-alpha):
12646 - When rejecting a router descriptor for running an obsolete version
12647 of Tor without ntor support, warn about the obsolete tor version,
12648 not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
12650 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
12651 - Avoid a sandbox failure when trying to re-bind to a socket and
12652 mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
12654 o Minor bugfixes (unit tests, backport from 0.3.1.5-alpha)
12655 - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
12656 Fixes bug 22803; bugfix on 0.3.0.1-alpha.
12659 Changes in version 0.3.0.9 - 2017-06-29
12660 Tor 0.3.0.9 fixes a path selection bug that would allow a client
12661 to use a guard that was in the same network family as a chosen exit
12662 relay. This is a security regression; all clients running earlier
12663 versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9 or
12666 This release also backports several other bugfixes from the 0.3.1.x
12669 o Major bugfixes (path selection, security, backport from 0.3.1.4-alpha):
12670 - When choosing which guard to use for a circuit, avoid the exit's
12671 family along with the exit itself. Previously, the new guard
12672 selection logic avoided the exit, but did not consider its family.
12673 Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
12674 006 and CVE-2017-0377.
12676 o Major bugfixes (entry guards, backport from 0.3.1.1-alpha):
12677 - Don't block bootstrapping when a primary bridge is offline and we
12678 can't get its descriptor. Fixes bug 22325; fixes one case of bug
12679 21969; bugfix on 0.3.0.3-alpha.
12681 o Major bugfixes (entry guards, backport from 0.3.1.4-alpha):
12682 - When starting with an old consensus, do not add new entry guards
12683 unless the consensus is "reasonably live" (under 1 day old). Fixes
12684 one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
12686 o Minor features (geoip):
12687 - Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
12690 o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
12691 - Reject version numbers with non-numeric prefixes (such as +, -, or
12692 whitespace). Disallowing whitespace prevents differential version
12693 parsing between POSIX-based and Windows platforms. Fixes bug 21507
12694 and part of 21508; bugfix on 0.0.8pre1.
12696 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
12697 - Permit the fchmod system call, to avoid crashing on startup when
12698 starting with the seccomp2 sandbox and an unexpected set of
12699 permissions on the data directory or its contents. Fixes bug
12700 22516; bugfix on 0.2.5.4-alpha.
12702 o Minor bugfixes (defensive programming, backport from 0.3.1.4-alpha):
12703 - Fix a memset() off the end of an array when packing cells. This
12704 bug should be harmless in practice, since the corrupted bytes are
12705 still in the same structure, and are always padding bytes,
12706 ignored, or immediately overwritten, depending on compiler
12707 behavior. Nevertheless, because the memset()'s purpose is to make
12708 sure that any other cell-handling bugs can't expose bytes to the
12709 network, we need to fix it. Fixes bug 22737; bugfix on
12710 0.2.4.11-alpha. Fixes CID 1401591.
12713 Changes in version 0.3.0.8 - 2017-06-08
12714 Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
12715 remotely crash a hidden service with an assertion failure. Anyone
12716 running a hidden service should upgrade to this version, or to some
12717 other version with fixes for TROVE-2017-004 and TROVE-2017-005.
12719 Tor 0.3.0.8 also includes fixes for several key management bugs
12720 that sometimes made relays unreliable, as well as several other
12721 bugfixes described below.
12723 o Major bugfixes (hidden service, relay, security, backport
12724 from 0.3.1.3-alpha):
12725 - Fix a remotely triggerable assertion failure when a hidden service
12726 handles a malformed BEGIN cell. Fixes bug 22493, tracked as
12727 TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
12728 - Fix a remotely triggerable assertion failure caused by receiving a
12729 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12730 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12733 o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
12734 - When performing the v3 link handshake on a TLS connection, report
12735 that we have the x509 certificate that we actually used on that
12736 connection, even if we have changed certificates since that
12737 connection was first opened. Previously, we would claim to have
12738 used our most recent x509 link certificate, which would sometimes
12739 make the link handshake fail. Fixes one case of bug 22460; bugfix
12742 o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
12743 - Regenerate link and authentication certificates whenever the key
12744 that signs them changes; also, regenerate link certificates
12745 whenever the signed key changes. Previously, these processes were
12746 only weakly coupled, and we relays could (for minutes to hours)
12747 wind up with an inconsistent set of keys and certificates, which
12748 other relays would not accept. Fixes two cases of bug 22460;
12749 bugfix on 0.3.0.1-alpha.
12750 - When sending an Ed25519 signing->link certificate in a CERTS cell,
12751 send the certificate that matches the x509 certificate that we
12752 used on the TLS connection. Previously, there was a race condition
12753 if the TLS context rotated after we began the TLS handshake but
12754 before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
12757 o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
12758 - Stop rejecting v3 hidden service descriptors because their size
12759 did not match an old padding rule. Fixes bug 22447; bugfix on
12762 o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
12763 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
12764 December 2016 (of which ~126 were still functional) with a list of
12765 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
12766 2017. Resolves ticket 21564.
12768 o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
12769 - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
12770 bug 22252; bugfix on 0.2.9.3-alpha.
12772 o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
12773 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12774 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12776 o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
12777 - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
12778 months, and regenerate it when it is within one month of expiring.
12779 Previously, we had generated this certificate at startup with a
12780 ten-year lifetime, but that could lead to weird behavior when Tor
12781 was started with a grossly inaccurate clock. Mitigates bug 22466;
12782 mitigation on 0.3.0.1-alpha.
12784 o Minor bugfixes (memory leak, directory authority, backport from
12786 - When directory authorities reject a router descriptor due to
12787 keypinning, free the router descriptor rather than leaking the
12788 memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
12791 Changes in version 0.2.9.11 - 2017-06-08
12792 Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to
12793 remotely crash a hidden service with an assertion failure. Anyone
12794 running a hidden service should upgrade to this version, or to some
12795 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
12796 are not affected by TROVE-2017-004.)
12798 Tor 0.2.9.11 also backports fixes for several key management bugs
12799 that sometimes made relays unreliable, as well as several other
12800 bugfixes described below.
12802 o Major bugfixes (hidden service, relay, security, backport
12803 from 0.3.1.3-alpha):
12804 - Fix a remotely triggerable assertion failure caused by receiving a
12805 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12806 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12809 o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
12810 - When performing the v3 link handshake on a TLS connection, report
12811 that we have the x509 certificate that we actually used on that
12812 connection, even if we have changed certificates since that
12813 connection was first opened. Previously, we would claim to have
12814 used our most recent x509 link certificate, which would sometimes
12815 make the link handshake fail. Fixes one case of bug 22460; bugfix
12818 o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
12819 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
12820 December 2016 (of which ~126 were still functional) with a list of
12821 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
12822 2017. Resolves ticket 21564.
12824 o Minor features (future-proofing, backport from 0.3.0.7):
12825 - Tor no longer refuses to download microdescriptors or descriptors if
12826 they are listed as "published in the future". This change will
12827 eventually allow us to stop listing meaningful "published" dates
12828 in microdescriptor consensuses, and thereby allow us to reduce the
12829 resources required to download consensus diffs by over 50%.
12830 Implements part of ticket 21642; implements part of proposal 275.
12832 o Minor features (directory authorities, backport from 0.3.0.4-rc)
12833 - Directory authorities now reject relays running versions
12834 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
12835 suffer from bug 20499 and don't keep their consensus cache
12836 up-to-date. Resolves ticket 20509.
12838 o Minor features (geoip):
12839 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12842 o Minor bugfixes (control port, backport from 0.3.0.6):
12843 - The GETINFO extra-info/digest/<digest> command was broken because
12844 of a wrong base16 decode return value check, introduced when
12845 refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
12847 o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
12848 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12849 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12851 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
12852 - The getpid() system call is now permitted under the Linux seccomp2
12853 sandbox, to avoid crashing with versions of OpenSSL (and other
12854 libraries) that attempt to learn the process's PID by using the
12855 syscall rather than the VDSO code. Fixes bug 21943; bugfix
12858 o Minor bugfixes (memory leak, directory authority, backport
12859 from 0.3.1.2-alpha):
12860 - When directory authorities reject a router descriptor due to
12861 keypinning, free the router descriptor rather than leaking the
12862 memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
12864 Changes in version 0.2.8.14 - 2017-06-08
12865 Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
12866 remotely crash a hidden service with an assertion failure. Anyone
12867 running a hidden service should upgrade to this version, or to some
12868 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
12869 are not affected by TROVE-2017-004.)
12871 o Major bugfixes (hidden service, relay, security):
12872 - Fix a remotely triggerable assertion failure caused by receiving a
12873 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12874 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12877 o Minor features (geoip):
12878 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12881 o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
12882 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
12883 December 2016 (of which ~126 were still functional) with a list of
12884 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
12885 2017. Resolves ticket 21564.
12887 o Minor bugfixes (correctness):
12888 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12889 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12891 Changes in version 0.2.7.8 - 2017-06-08
12892 Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
12893 remotely crash a hidden service with an assertion failure. Anyone
12894 running a hidden service should upgrade to this version, or to some
12895 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
12896 are not affected by TROVE-2017-004.)
12898 o Major bugfixes (hidden service, relay, security):
12899 - Fix a remotely triggerable assertion failure caused by receiving a
12900 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12901 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12904 o Minor features (geoip):
12905 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12908 o Minor bugfixes (correctness):
12909 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12910 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12913 Changes in version 0.2.6.12 - 2017-06-08
12914 Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to
12915 remotely crash a hidden service with an assertion failure. Anyone
12916 running a hidden service should upgrade to this version, or to some
12917 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
12918 are not affected by TROVE-2017-004.)
12920 o Major bugfixes (hidden service, relay, security):
12921 - Fix a remotely triggerable assertion failure caused by receiving a
12922 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12923 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12926 o Minor features (geoip):
12927 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12930 o Minor bugfixes (correctness):
12931 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12932 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12934 Changes in version 0.2.5.14 - 2017-06-08
12935 Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to
12936 remotely crash a hidden service with an assertion failure. Anyone
12937 running a hidden service should upgrade to this version, or to some
12938 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
12939 are not affected by TROVE-2017-004.)
12941 o Major bugfixes (hidden service, relay, security):
12942 - Fix a remotely triggerable assertion failure caused by receiving a
12943 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12944 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12947 o Minor features (geoip):
12948 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12951 o Minor bugfixes (correctness):
12952 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12953 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12955 Changes in version 0.2.4.29 - 2017-06-08
12956 Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to
12957 remotely crash a hidden service with an assertion failure. Anyone
12958 running a hidden service should upgrade to this version, or to some
12959 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
12960 are not affected by TROVE-2017-004.)
12962 o Major bugfixes (hidden service, relay, security):
12963 - Fix a remotely triggerable assertion failure caused by receiving a
12964 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
12965 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
12968 o Minor features (geoip):
12969 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12972 o Minor bugfixes (correctness):
12973 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
12974 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
12977 Changes in version 0.3.0.7 - 2017-05-15
12978 Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
12979 of Tor 0.3.0.x, where an attacker could cause a Tor relay process
12980 to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
12981 clients are not affected.
12983 o Major bugfixes (hidden service directory, security):
12984 - Fix an assertion failure in the hidden service directory code, which
12985 could be used by an attacker to remotely cause a Tor relay process to
12986 exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
12987 should upgrade. This security issue is tracked as TROVE-2017-002.
12988 Fixes bug 22246; bugfix on 0.3.0.1-alpha.
12991 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
12994 o Minor features (future-proofing):
12995 - Tor no longer refuses to download microdescriptors or descriptors
12996 if they are listed as "published in the future". This change will
12997 eventually allow us to stop listing meaningful "published" dates
12998 in microdescriptor consensuses, and thereby allow us to reduce the
12999 resources required to download consensus diffs by over 50%.
13000 Implements part of ticket 21642; implements part of proposal 275.
13002 o Minor bugfixes (Linux seccomp2 sandbox):
13003 - The getpid() system call is now permitted under the Linux seccomp2
13004 sandbox, to avoid crashing with versions of OpenSSL (and other
13005 libraries) that attempt to learn the process's PID by using the
13006 syscall rather than the VDSO code. Fixes bug 21943; bugfix
13010 Changes in version 0.3.0.6 - 2017-04-26
13011 Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
13013 With the 0.3.0 series, clients and relays now use Ed25519 keys to
13014 authenticate their link connections to relays, rather than the old
13015 RSA1024 keys that they used before. (Circuit crypto has been
13016 Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
13017 the guard selection and replacement algorithm to behave more robustly
13018 in the presence of unreliable networks, and to resist guard-
13021 This series also includes numerous other small features and bugfixes,
13022 along with more groundwork for the upcoming hidden-services revamp.
13024 Per our stable release policy, we plan to support the Tor 0.3.0
13025 release series for at least the next nine months, or for three months
13026 after the first stable release of the 0.3.1 series: whichever is
13027 longer. If you need a release with long-term support, we recommend
13028 that you stay with the 0.2.9 series.
13030 Below are the changes since 0.2.9.10. For a list of only the changes
13031 since 0.3.0.5-rc, see the ChangeLog file.
13033 o Major features (directory authority, security):
13034 - The default for AuthDirPinKeys is now 1: directory authorities
13035 will reject relays where the RSA identity key matches a previously
13036 seen value, but the Ed25519 key has changed. Closes ticket 18319.
13038 o Major features (guard selection algorithm):
13039 - Tor's guard selection algorithm has been redesigned from the
13040 ground up, to better support unreliable networks and restrictive
13041 sets of entry nodes, and to better resist guard-capture attacks by
13042 hostile local networks. Implements proposal 271; closes
13045 o Major features (next-generation hidden services):
13046 - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
13047 prop224 aka "Next Generation Hidden Services". Service and clients
13048 don't use this functionality yet. Closes ticket 19043. Based on
13049 initial code by Alec Heifetz.
13050 - Relays now support the HSDir version 3 protocol, so that they can
13051 can store and serve v3 descriptors. This is part of the next-
13052 generation onion service work detailed in proposal 224. Closes
13055 o Major features (protocol, ed25519 identity keys):
13056 - Clients now support including Ed25519 identity keys in the EXTEND2
13057 cells they generate. By default, this is controlled by a consensus
13058 parameter, currently disabled. You can turn this feature on for
13059 testing by setting ExtendByEd25519ID in your configuration. This
13060 might make your traffic appear different than the traffic
13061 generated by other users, however. Implements part of ticket
13062 15056; part of proposal 220.
13063 - Relays now understand requests to extend to other relays by their
13064 Ed25519 identity keys. When an Ed25519 identity key is included in
13065 an EXTEND2 cell, the relay will only extend the circuit if the
13066 other relay can prove ownership of that identity. Implements part
13067 of ticket 15056; part of proposal 220.
13068 - Relays now use Ed25519 to prove their Ed25519 identities and to
13069 one another, and to clients. This algorithm is faster and more
13070 secure than the RSA-based handshake we've been doing until now.
13071 Implements the second big part of proposal 220; Closes
13074 o Major features (security):
13075 - Change the algorithm used to decide DNS TTLs on client and server
13076 side, to better resist DNS-based correlation attacks like the
13077 DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
13078 Feamster. Now relays only return one of two possible DNS TTL
13079 values, and clients are willing to believe DNS TTL values up to 3
13080 hours long. Closes ticket 19769.
13082 o Major bugfixes (client, onion service, also in 0.2.9.9):
13083 - Fix a client-side onion service reachability bug, where multiple
13084 socks requests to an onion service (or a single slow request)
13085 could cause us to mistakenly mark some of the service's
13086 introduction points as failed, and we cache that failure so
13087 eventually we run out and can't reach the service. Also resolves a
13088 mysterious "Remote server sent bogus reason code 65021" log
13089 warning. The bug was introduced in ticket 17218, where we tried to
13090 remember the circuit end reason as a uint16_t, which mangled
13091 negative values. Partially fixes bug 21056 and fixes bug 20307;
13092 bugfix on 0.2.8.1-alpha.
13094 o Major bugfixes (crash, directory connections):
13095 - Fix a rare crash when sending a begin cell on a circuit whose
13096 linked directory connection had already been closed. Fixes bug
13097 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
13099 o Major bugfixes (directory authority):
13100 - During voting, when marking a relay as a probable sybil, do not
13101 clear its BadExit flag: sybils can still be bad in other ways
13102 too. (We still clear the other flags.) Fixes bug 21108; bugfix
13105 o Major bugfixes (DNS):
13106 - Fix a bug that prevented exit nodes from caching DNS records for
13107 more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
13109 o Major bugfixes (IPv6 Exits):
13110 - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
13111 any IPv6 addresses. Instead, only reject a port over IPv6 if the
13112 exit policy rejects that port on more than an IPv6 /16 of
13113 addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
13114 which rejected a relay's own IPv6 address by default. Fixes bug
13115 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
13117 o Major bugfixes (parsing):
13118 - Fix an integer underflow bug when comparing malformed Tor
13119 versions. This bug could crash Tor when built with
13120 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
13121 0.2.9.8, which were built with -ftrapv by default. In other cases
13122 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
13123 on 0.0.8pre1. Found by OSS-Fuzz.
13124 - When parsing a malformed content-length field from an HTTP
13125 message, do not read off the end of the buffer. This bug was a
13126 potential remote denial-of-service attack against Tor clients and
13127 relays. A workaround was released in October 2016, to prevent this
13128 bug from crashing Tor. This is a fix for the underlying issue,
13129 which should no longer matter (if you applied the earlier patch).
13130 Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
13131 using AFL (http://lcamtuf.coredump.cx/afl/).
13133 o Major bugfixes (scheduler):
13134 - Actually compare circuit policies in ewma_cmp_cmux(). This bug
13135 caused the channel scheduler to behave more or less randomly,
13136 rather than preferring channels with higher-priority circuits.
13137 Fixes bug 20459; bugfix on 0.2.6.2-alpha.
13139 o Major bugfixes (security, also in 0.2.9.9):
13140 - Downgrade the "-ftrapv" option from "always on" to "only on when
13141 --enable-expensive-hardening is provided." This hardening option,
13142 like others, can turn survivable bugs into crashes--and having it
13143 on by default made a (relatively harmless) integer overflow bug
13144 into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
13145 bugfix on 0.2.9.1-alpha.
13147 o Minor feature (client):
13148 - Enable IPv6 traffic on the SocksPort by default. To disable this,
13149 a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
13151 o Minor feature (fallback scripts):
13152 - Add a check_existing mode to updateFallbackDirs.py, which checks
13153 if fallbacks in the hard-coded list are working. Closes ticket
13154 20174. Patch by haxxpop.
13156 o Minor feature (protocol versioning):
13157 - Add new protocol version for proposal 224. HSIntro now advertises
13158 version "3-4" and HSDir version "1-2". Fixes ticket 20656.
13160 o Minor features (ciphersuite selection):
13161 - Allow relays to accept a wider range of ciphersuites, including
13162 chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
13163 - Clients now advertise a list of ciphersuites closer to the ones
13164 preferred by Firefox. Closes part of ticket 15426.
13166 o Minor features (controller):
13167 - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
13168 shared-random values to the controller. Closes ticket 19925.
13169 - When HSFETCH arguments cannot be parsed, say "Invalid argument"
13170 rather than "unrecognized." Closes ticket 20389; patch from
13173 o Minor features (controller, configuration):
13174 - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
13175 and so on, now comes with a __*Port variant that will not be saved
13176 to the torrc file by the controller's SAVECONF command. This
13177 change allows TorBrowser to set up a single-use domain socket for
13178 each time it launches Tor. Closes ticket 20956.
13179 - The GETCONF command can now query options that may only be
13180 meaningful in context-sensitive lists. This allows the controller
13181 to query the mixed SocksPort/__SocksPort style options introduced
13182 in feature 20956. Implements ticket 21300.
13184 o Minor features (diagnostic, directory client):
13185 - Warn when we find an unexpected inconsistency in directory
13186 download status objects. Prevents some negative consequences of
13189 o Minor features (directory authorities):
13190 - Directory authorities now reject descriptors that claim to be
13191 malformed versions of Tor. Helps prevent exploitation of
13193 - Reject version numbers with components that exceed INT32_MAX.
13194 Otherwise 32-bit and 64-bit platforms would behave inconsistently.
13195 Fixes bug 21450; bugfix on 0.0.8pre1.
13197 o Minor features (directory authority):
13198 - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
13199 default) to control whether authorities should try to probe relays
13200 by their Ed25519 link keys. This option will go away in a few
13201 releases--unless we encounter major trouble in our ed25519 link
13202 protocol rollout, in which case it will serve as a safety option.
13204 o Minor features (directory cache):
13205 - Relays and bridges will now refuse to serve the consensus they
13206 have if they know it is too old for a client to use. Closes
13209 o Minor features (ed25519 link handshake):
13210 - Advertise support for the ed25519 link handshake using the
13211 subprotocol-versions mechanism, so that clients can tell which
13212 relays can identity themselves by Ed25519 ID. Closes ticket 20552.
13214 o Minor features (entry guards):
13215 - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
13216 break regression tests.
13217 - Require UseEntryGuards when UseBridges is set, in order to make
13218 sure bridges aren't bypassed. Resolves ticket 20502.
13220 o Minor features (fallback directories):
13221 - Allow 3 fallback relays per operator, which is safe now that we
13222 are choosing 200 fallback relays. Closes ticket 20912.
13223 - Annotate updateFallbackDirs.py with the bandwidth and consensus
13224 weight for each candidate fallback. Closes ticket 20878.
13225 - Display the relay fingerprint when downloading consensuses from
13226 fallbacks. Closes ticket 20908.
13227 - Exclude relays affected by bug 20499 from the fallback list.
13228 Exclude relays from the fallback list if they are running versions
13229 known to be affected by bug 20499, or if in our tests they deliver
13230 a stale consensus (i.e. one that expired more than 24 hours ago).
13231 Closes ticket 20539.
13232 - Make it easier to change the output sort order of fallbacks.
13233 Closes ticket 20822.
13234 - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
13236 - Require fallback directories to have the same address and port for
13237 7 days (now that we have enough relays with this stability).
13238 Relays whose OnionOO stability timer is reset on restart by bug
13239 18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
13240 this issue. Closes ticket 20880; maintains short-term fix
13242 - Require fallbacks to have flags for 90% of the time (weighted
13243 decaying average), rather than 95%. This allows at least 73% of
13244 clients to bootstrap in the first 5 seconds without contacting an
13245 authority. Part of ticket 18828.
13246 - Select 200 fallback directories for each release. Closes
13249 o Minor features (fingerprinting resistance, authentication):
13250 - Extend the length of RSA keys used for TLS link authentication to
13251 2048 bits. (These weren't used for forward secrecy; for forward
13252 secrecy, we used P256.) Closes ticket 13752.
13254 o Minor features (geoip):
13255 - Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
13258 o Minor features (geoip, also in 0.2.9.9):
13259 - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
13262 o Minor features (infrastructure):
13263 - Implement smartlist_add_strdup() function. Replaces the use of
13264 smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
13266 o Minor features (linting):
13267 - Enhance the changes file linter to warn on Tor versions that are
13268 prefixed with "tor-". Closes ticket 21096.
13270 o Minor features (logging):
13271 - In several places, describe unset ed25519 keys as "<unset>",
13272 rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
13274 o Minor features (portability, compilation):
13275 - Autoconf now checks to determine if OpenSSL structures are opaque,
13276 instead of explicitly checking for OpenSSL version numbers. Part
13278 - Support building with recent LibreSSL code that uses opaque
13279 structures. Closes ticket 21359.
13281 o Minor features (relay):
13282 - We now allow separation of exit and relay traffic to different
13283 source IP addresses, using the OutboundBindAddressExit and
13284 OutboundBindAddressOR options respectively. Closes ticket 17975.
13285 Written by Michael Sonntag.
13287 o Minor features (reliability, crash):
13288 - Try better to detect problems in buffers where they might grow (or
13289 think they have grown) over 2 GB in size. Diagnostic for
13292 o Minor features (testing):
13293 - During 'make test-network-all', if tor logs any warnings, ask
13294 chutney to output them. Requires a recent version of chutney with
13295 the 21572 patch. Implements 21570.
13297 o Minor bugfix (control protocol):
13298 - The reply to a "GETINFO config/names" request via the control
13299 protocol now spells the type "Dependent" correctly. This is a
13300 breaking change in the control protocol. (The field seems to be
13301 ignored by the most common known controllers.) Fixes bug 18146;
13302 bugfix on 0.1.1.4-alpha.
13303 - The GETINFO extra-info/digest/<digest> command was broken because
13304 of a wrong base16 decode return value check, introduced when
13305 refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
13307 o Minor bugfix (logging):
13308 - Don't recommend the use of Tor2web in non-anonymous mode.
13309 Recommending Tor2web is a bad idea because the client loses all
13310 anonymity. Tor2web should only be used in specific cases by users
13311 who *know* and understand the issues. Fixes bug 21294; bugfix
13314 o Minor bugfixes (bug resilience):
13315 - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
13316 19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
13317 Hans Jerry Illikainen.
13319 o Minor bugfixes (build):
13320 - Replace obsolete Autoconf macros with their modern equivalent and
13321 prevent similar issues in the future. Fixes bug 20990; bugfix
13324 o Minor bugfixes (certificate expiration time):
13325 - Avoid using link certificates that don't become valid till some
13326 time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
13328 o Minor bugfixes (client):
13329 - Always recover from failures in extend_info_from_node(), in an
13330 attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
13331 bugfix on 0.2.3.1-alpha.
13332 - When clients that use bridges start up with a cached consensus on
13333 disk, they were ignoring it and downloading a new one. Now they
13334 use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
13336 o Minor bugfixes (code correctness):
13337 - Repair a couple of (unreachable or harmless) cases of the risky
13338 comparison-by-subtraction pattern that caused bug 21278.
13340 o Minor bugfixes (config):
13341 - Don't assert on startup when trying to get the options list and
13342 LearnCircuitBuildTimeout is set to 0: we are currently parsing the
13343 options so of course they aren't ready yet. Fixes bug 21062;
13344 bugfix on 0.2.9.3-alpha.
13346 o Minor bugfixes (configuration):
13347 - Accept non-space whitespace characters after the severity level in
13348 the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
13349 - Support "TByte" and "TBytes" units in options given in bytes.
13350 "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
13351 supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
13353 o Minor bugfixes (configure, autoconf):
13354 - Rename the configure option --enable-expensive-hardening to
13355 --enable-fragile-hardening. Expensive hardening makes the tor
13356 daemon abort when some kinds of issues are detected. Thus, it
13357 makes tor more at risk of remote crashes but safer against RCE or
13358 heartbleed bug category. We now try to explain this issue in a
13359 message from the configure script. Fixes bug 21290; bugfix
13362 o Minor bugfixes (consensus weight):
13363 - Add new consensus method that initializes bw weights to 1 instead
13364 of 0. This prevents a zero weight from making it all the way to
13365 the end (happens in small testing networks) and causing an error.
13366 Fixes bug 14881; bugfix on 0.2.2.17-alpha.
13368 o Minor bugfixes (crash prevention):
13369 - Fix an (currently untriggerable, but potentially dangerous) crash
13370 bug when base32-encoding inputs whose sizes are not a multiple of
13371 5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
13373 o Minor bugfixes (dead code):
13374 - Remove a redundant check for PidFile changes at runtime in
13375 options_transition_allowed(): this check is already performed
13376 regardless of whether the sandbox is active. Fixes bug 21123;
13377 bugfix on 0.2.5.4-alpha.
13379 o Minor bugfixes (descriptors):
13380 - Correctly recognise downloaded full descriptors as valid, even
13381 when using microdescriptors as circuits. This affects clients with
13382 FetchUselessDescriptors set, and may affect directory authorities.
13383 Fixes bug 20839; bugfix on 0.2.3.2-alpha.
13385 o Minor bugfixes (directory mirrors):
13386 - Allow relays to use directory mirrors without a DirPort: these
13387 relays need to be contacted over their ORPorts using a begindir
13388 connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
13389 - Clarify the message logged when a remote relay is unexpectedly
13390 missing an ORPort or DirPort: users were confusing this with a
13391 local port. Fixes another case of bug 20711; bugfix
13394 o Minor bugfixes (directory system):
13395 - Bridges and relays now use microdescriptors (like clients do)
13396 rather than old-style router descriptors. Now bridges will blend
13397 in with clients in terms of the circuits they build. Fixes bug
13398 6769; bugfix on 0.2.3.2-alpha.
13399 - Download all consensus flavors, descriptors, and authority
13400 certificates when FetchUselessDescriptors is set, regardless of
13401 whether tor is a directory cache or not. Fixes bug 20667; bugfix
13402 on all recent tor versions.
13404 o Minor bugfixes (documentation):
13405 - Update the tor manual page to document every option that can not
13406 be changed while tor is running. Fixes bug 21122.
13408 o Minor bugfixes (ed25519 certificates):
13409 - Correctly interpret ed25519 certificates that would expire some
13410 time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
13412 o Minor bugfixes (fallback directories):
13413 - Avoid checking fallback candidates' DirPorts if they are down in
13414 OnionOO. When a relay operator has multiple relays, this
13415 prioritizes relays that are up over relays that are down. Fixes
13416 bug 20926; bugfix on 0.2.8.3-alpha.
13417 - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
13418 Fixes bug 20877; bugfix on 0.2.8.3-alpha.
13419 - Stop failing when a relay has no uptime data in
13420 updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
13422 o Minor bugfixes (hidden service):
13423 - Clean up the code for expiring intro points with no associated
13424 circuits. It was causing, rarely, a service with some expiring
13425 introduction points to not open enough additional introduction
13426 points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
13427 - Resolve two possible underflows which could lead to creating and
13428 closing a lot of introduction point circuits in a non-stop loop.
13429 Fixes bug 21302; bugfix on 0.2.7.2-alpha.
13430 - Stop setting the torrc option HiddenServiceStatistics to "0" just
13431 because we're not a bridge or relay. Instead, we preserve whatever
13432 value the user set (or didn't set). Fixes bug 21150; bugfix
13435 o Minor bugfixes (hidden services):
13436 - Make hidden services check for failed intro point connections,
13437 even when they have exceeded their intro point creation limit.
13438 Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
13439 - Make hidden services with 8 to 10 introduction points check for
13440 failed circuits immediately after startup. Previously, they would
13441 wait for 5 minutes before performing their first checks. Fixes bug
13442 21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
13443 - Stop ignoring misconfigured hidden services. Instead, refuse to
13444 start tor until the misconfigurations have been corrected. Fixes
13445 bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
13448 o Minor bugfixes (IPv6):
13449 - Make IPv6-using clients try harder to find an IPv6 directory
13450 server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
13451 - When IPv6 addresses have not been downloaded yet (microdesc
13452 consensus documents don't list relay IPv6 addresses), use hard-
13453 coded addresses for authorities, fallbacks, and configured
13454 bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
13455 20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
13457 o Minor bugfixes (memory leak at exit):
13458 - Fix a small harmless memory leak at exit of the previously unused
13459 RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
13462 o Minor bugfixes (onion services):
13463 - Allow the number of introduction points to be as low as 0, rather
13464 than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
13466 o Minor bugfixes (portability):
13467 - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
13468 It is supported by OpenBSD itself, and also by most OpenBSD
13469 variants (such as Bitrig). Fixes bug 20980; bugfix
13472 o Minor bugfixes (portability, also in 0.2.9.9):
13473 - Avoid crashing when Tor is built using headers that contain
13474 CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
13475 without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
13477 - Fix Libevent detection on platforms without Libevent 1 headers
13478 installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
13480 o Minor bugfixes (relay):
13481 - Avoid a double-marked-circuit warning that could happen when we
13482 receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
13484 - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
13485 initializing the keys would reset the DataDirectory to 0700
13486 instead of 0750 even if DataDirectoryGroupReadable was set to 1.
13487 Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
13489 o Minor bugfixes (testing):
13490 - Fix Raspbian build issues related to missing socket errno in
13491 test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch by "hein".
13492 - Remove undefined behavior from the backtrace generator by removing
13493 its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
13494 - Use bash in src/test/test-network.sh. This ensures we reliably
13495 call chutney's newer tools/test-network.sh when available. Fixes
13496 bug 21562; bugfix on 0.2.9.1-alpha.
13498 o Minor bugfixes (tor-resolve):
13499 - The tor-resolve command line tool now rejects hostnames over 255
13500 characters in length. Previously, it would silently truncate them,
13501 which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
13502 Patch by "junglefowl".
13504 o Minor bugfixes (unit tests):
13505 - Allow the unit tests to pass even when DNS lookups of bogus
13506 addresses do not fail as expected. Fixes bug 20862 and 20863;
13507 bugfix on unit tests introduced in 0.2.8.1-alpha
13508 through 0.2.9.4-alpha.
13510 o Minor bugfixes (util):
13511 - When finishing writing a file to disk, if we were about to replace
13512 the file with the temporary file created before and we fail to
13513 replace it, remove the temporary file so it doesn't stay on disk.
13514 Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
13516 o Minor bugfixes (Windows services):
13517 - Be sure to initialize the monotonic time subsystem before using
13518 it, even when running as an NT service. Fixes bug 21356; bugfix
13521 o Minor bugfixes (Windows):
13522 - Check for getpagesize before using it to mmap files. This fixes
13523 compilation in some MinGW environments. Fixes bug 20530; bugfix on
13524 0.1.2.1-alpha. Reported by "ice".
13526 o Code simplification and refactoring:
13527 - Abolish all global guard context in entrynodes.c; replace with new
13528 guard_selection_t structure as preparation for proposal 271.
13529 Closes ticket 19858.
13530 - Extract magic numbers in circuituse.c into defined variables.
13531 - Introduce rend_service_is_ephemeral() that tells if given onion
13532 service is ephemeral. Replace unclear NULL-checkings for service
13533 directory with this function. Closes ticket 20526.
13534 - Refactor circuit_is_available_for_use to remove unnecessary check.
13535 - Refactor circuit_predict_and_launch_new for readability and
13536 testability. Closes ticket 18873.
13537 - Refactor code to manipulate global_origin_circuit_list into
13538 separate functions. Closes ticket 20921.
13539 - Refactor large if statement in purpose_needs_anonymity to use
13540 switch statement instead. Closes part of ticket 20077.
13541 - Refactor the hashing API to return negative values for errors, as
13542 is done as throughout the codebase. Closes ticket 20717.
13543 - Remove data structures that were used to index or_connection
13544 objects by their RSA identity digests. These structures are fully
13545 redundant with the similar structures used in the
13546 channel abstraction.
13547 - Remove duplicate code in the channel_write_*cell() functions.
13548 Closes ticket 13827; patch from Pingl.
13549 - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
13550 use only purpose_needs_anonymity. Closes part of ticket 20077.
13551 - The code to generate and parse EXTEND and EXTEND2 cells has been
13552 replaced with code automatically generated by the
13555 o Documentation (formatting):
13556 - Clean up formatting of tor.1 man page and HTML doc, where <pre>
13557 blocks were incorrectly appearing. Closes ticket 20885.
13559 o Documentation (man page):
13560 - Clarify many options in tor.1 and add some min/max values for
13561 HiddenService options. Closes ticket 21058.
13564 - Change '1' to 'weight_scale' in consensus bw weights calculation
13565 comments, as that is reality. Closes ticket 20273. Patch
13567 - Clarify that when ClientRejectInternalAddresses is enabled (which
13568 is the default), multicast DNS hostnames for machines on the local
13569 network (of the form *.local) are also rejected. Closes
13571 - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
13572 250 KBytes to 2 MBytes. Fixes bug 20435; bugfix on 0.2.5.6-alpha.
13573 - Include the "TBits" unit in Tor's man page. Fixes part of bug
13574 20622; bugfix on 0.2.5.1-alpha.
13575 - Small fixes to the fuzzing documentation. Closes ticket 21472.
13576 - Stop the man page from incorrectly stating that HiddenServiceDir
13577 must already exist. Fixes 20486.
13578 - Update the description of the directory server options in the
13579 manual page, to clarify that a relay no longer needs to set
13580 DirPort in order to be a directory cache. Closes ticket 21720.
13582 o Removed features:
13583 - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
13584 limit for relays running on a single IP applies to authority IP
13585 addresses as well as to non-authority IP addresses. Closes
13587 - The UseDirectoryGuards torrc option no longer exists: all users
13588 that use entry guards will also use directory guards. Related to
13589 proposal 271; implements part of ticket 20831.
13592 - Add tests for networkstatus_compute_bw_weights_v10.
13593 - Add unit tests circuit_predict_and_launch_new.
13594 - Extract dummy_origin_circuit_new so it can be used by other
13596 - New unit tests for tor_htonll(). Closes ticket 19563. Patch
13597 from "overcaffeinated".
13598 - Perform the coding style checks when running the tests and fail
13599 when coding style violations are found. Closes ticket 5500.
13602 Changes in version 0.2.8.13 - 2017-03-03
13603 Tor 0.2.8.13 backports a security fix from later Tor
13604 releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
13605 this release, if for some reason they cannot upgrade to a later
13606 release series, and if they build Tor with the --enable-expensive-hardening
13609 Note that support for Tor 0.2.8.x is ending next year: we will not issue
13610 any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
13611 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
13613 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
13614 - Fix an integer underflow bug when comparing malformed Tor
13615 versions. This bug could crash Tor when built with
13616 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
13617 0.2.9.8, which were built with -ftrapv by default. In other cases
13618 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
13619 on 0.0.8pre1. Found by OSS-Fuzz.
13621 o Minor features (geoip):
13622 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
13626 Changes in version 0.2.7.7 - 2017-03-03
13627 Tor 0.2.7.7 backports a number of security fixes from later Tor
13628 releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
13629 this release, if for some reason they cannot upgrade to a later
13632 Note that support for Tor 0.2.7.x is ending this year: we will not issue
13633 any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
13634 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
13636 o Directory authority changes (backport from 0.2.8.5-rc):
13637 - Urras is no longer a directory authority. Closes ticket 19271.
13639 o Directory authority changes (backport from 0.2.9.2-alpha):
13640 - The "Tonga" bridge authority has been retired; the new bridge
13641 authority is "Bifroest". Closes tickets 19728 and 19690.
13643 o Directory authority key updates (backport from 0.2.8.1-alpha):
13644 - Update the V3 identity key for the dannenberg directory authority:
13645 it was changed on 18 November 2015. Closes task 17906. Patch
13648 o Major bugfixes (parsing, security, backport from 0.2.9.8):
13649 - Fix a bug in parsing that could cause clients to read a single
13650 byte past the end of an allocated region. This bug could be used
13651 to cause hardened clients (built with --enable-expensive-hardening)
13652 to crash if they tried to visit a hostile hidden service. Non-
13653 hardened clients are only affected depending on the details of
13654 their platform's memory allocator. Fixes bug 21018; bugfix on
13655 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
13656 2016-12-002 and as CVE-2016-1254.
13658 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
13659 - Stop a crash that could occur when a client running with DNSPort
13660 received a query with multiple address types, and the first
13661 address type was not supported. Found and fixed by Scott Dial.
13662 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
13663 - Prevent a class of security bugs caused by treating the contents
13664 of a buffer chunk as if they were a NUL-terminated string. At
13665 least one such bug seems to be present in all currently used
13666 versions of Tor, and would allow an attacker to remotely crash
13667 most Tor instances, especially those compiled with extra compiler
13668 hardening. With this defense in place, such bugs can't crash Tor,
13669 though we should still fix them as they occur. Closes ticket
13670 20384 (TROVE-2016-10-001).
13672 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
13673 - Avoid a difficult-to-trigger heap corruption attack when extending
13674 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
13675 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
13676 Reported by Guido Vranken.
13678 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
13679 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
13680 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
13682 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
13683 - If OpenSSL fails to generate an RSA key, do not retain a dangling
13684 pointer to the previous (uninitialized) key value. The impact here
13685 should be limited to a difficult-to-trigger crash, if OpenSSL is
13686 running an engine that makes key generation failures possible, or
13687 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
13688 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
13691 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
13692 - Fix an integer underflow bug when comparing malformed Tor
13693 versions. This bug could crash Tor when built with
13694 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
13695 0.2.9.8, which were built with -ftrapv by default. In other cases
13696 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
13697 on 0.0.8pre1. Found by OSS-Fuzz.
13699 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
13700 - Make memwipe() do nothing when passed a NULL pointer or buffer of
13701 zero size. Check size argument to memwipe() for underflow. Fixes
13702 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
13705 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
13706 - Make Tor survive errors involving connections without a
13707 corresponding event object. Previously we'd fail with an
13708 assertion; now we produce a log message. Related to bug 16248.
13710 o Minor features (geoip):
13711 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
13715 Changes in version 0.2.6.11 - 2017-03-03
13716 Tor 0.2.6.11 backports a number of security fixes from later Tor
13717 releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
13718 this release, if for some reason they cannot upgrade to a later
13721 Note that support for Tor 0.2.6.x is ending this year: we will not issue
13722 any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
13723 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
13725 o Directory authority changes (backport from 0.2.8.5-rc):
13726 - Urras is no longer a directory authority. Closes ticket 19271.
13728 o Directory authority changes (backport from 0.2.9.2-alpha):
13729 - The "Tonga" bridge authority has been retired; the new bridge
13730 authority is "Bifroest". Closes tickets 19728 and 19690.
13732 o Directory authority key updates (backport from 0.2.8.1-alpha):
13733 - Update the V3 identity key for the dannenberg directory authority:
13734 it was changed on 18 November 2015. Closes task 17906. Patch
13737 o Major features (security fixes, backport from 0.2.9.4-alpha):
13738 - Prevent a class of security bugs caused by treating the contents
13739 of a buffer chunk as if they were a NUL-terminated string. At
13740 least one such bug seems to be present in all currently used
13741 versions of Tor, and would allow an attacker to remotely crash
13742 most Tor instances, especially those compiled with extra compiler
13743 hardening. With this defense in place, such bugs can't crash Tor,
13744 though we should still fix them as they occur. Closes ticket
13745 20384 (TROVE-2016-10-001).
13747 o Major bugfixes (parsing, security, backport from 0.2.9.8):
13748 - Fix a bug in parsing that could cause clients to read a single
13749 byte past the end of an allocated region. This bug could be used
13750 to cause hardened clients (built with --enable-expensive-hardening)
13751 to crash if they tried to visit a hostile hidden service. Non-
13752 hardened clients are only affected depending on the details of
13753 their platform's memory allocator. Fixes bug 21018; bugfix on
13754 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
13755 2016-12-002 and as CVE-2016-1254.
13757 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
13758 - Stop a crash that could occur when a client running with DNSPort
13759 received a query with multiple address types, and the first
13760 address type was not supported. Found and fixed by Scott Dial.
13761 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
13763 o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
13764 - Fix an error that could cause us to read 4 bytes before the
13765 beginning of an openssl string. This bug could be used to cause
13766 Tor to crash on systems with unusual malloc implementations, or
13767 systems with unusual hardening installed. Fixes bug 17404; bugfix
13770 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
13771 - Avoid a difficult-to-trigger heap corruption attack when extending
13772 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
13773 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
13774 Reported by Guido Vranken.
13776 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
13777 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
13778 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
13780 o Major bugfixes (guard selection, backport from 0.2.7.6):
13781 - Actually look at the Guard flag when selecting a new directory
13782 guard. When we implemented the directory guard design, we
13783 accidentally started treating all relays as if they have the Guard
13784 flag during guard selection, leading to weaker anonymity and worse
13785 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
13788 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
13789 - If OpenSSL fails to generate an RSA key, do not retain a dangling
13790 pointer to the previous (uninitialized) key value. The impact here
13791 should be limited to a difficult-to-trigger crash, if OpenSSL is
13792 running an engine that makes key generation failures possible, or
13793 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
13794 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
13797 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
13798 - Fix an integer underflow bug when comparing malformed Tor
13799 versions. This bug could crash Tor when built with
13800 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
13801 0.2.9.8, which were built with -ftrapv by default. In other cases
13802 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
13803 on 0.0.8pre1. Found by OSS-Fuzz.
13805 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
13806 - Make memwipe() do nothing when passed a NULL pointer or buffer of
13807 zero size. Check size argument to memwipe() for underflow. Fixes
13808 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
13811 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
13812 - Make Tor survive errors involving connections without a
13813 corresponding event object. Previously we'd fail with an
13814 assertion; now we produce a log message. Related to bug 16248.
13816 o Minor features (geoip):
13817 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
13820 o Minor bugfixes (compilation, backport from 0.2.7.6):
13821 - Fix a compilation warning with Clang 3.6: Do not check the
13822 presence of an address which can never be NULL. Fixes bug 17781.
13825 Changes in version 0.2.5.13 - 2017-03-03
13826 Tor 0.2.5.13 backports a number of security fixes from later Tor
13827 releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
13828 this release, if for some reason they cannot upgrade to a later
13831 Note that support for Tor 0.2.5.x is ending next year: we will not issue
13832 any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
13833 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
13835 o Directory authority changes (backport from 0.2.8.5-rc):
13836 - Urras is no longer a directory authority. Closes ticket 19271.
13838 o Directory authority changes (backport from 0.2.9.2-alpha):
13839 - The "Tonga" bridge authority has been retired; the new bridge
13840 authority is "Bifroest". Closes tickets 19728 and 19690.
13842 o Directory authority key updates (backport from 0.2.8.1-alpha):
13843 - Update the V3 identity key for the dannenberg directory authority:
13844 it was changed on 18 November 2015. Closes task 17906. Patch
13847 o Major features (security fixes, backport from 0.2.9.4-alpha):
13848 - Prevent a class of security bugs caused by treating the contents
13849 of a buffer chunk as if they were a NUL-terminated string. At
13850 least one such bug seems to be present in all currently used
13851 versions of Tor, and would allow an attacker to remotely crash
13852 most Tor instances, especially those compiled with extra compiler
13853 hardening. With this defense in place, such bugs can't crash Tor,
13854 though we should still fix them as they occur. Closes ticket
13855 20384 (TROVE-2016-10-001).
13857 o Major bugfixes (parsing, security, backport from 0.2.9.8):
13858 - Fix a bug in parsing that could cause clients to read a single
13859 byte past the end of an allocated region. This bug could be used
13860 to cause hardened clients (built with --enable-expensive-hardening)
13861 to crash if they tried to visit a hostile hidden service. Non-
13862 hardened clients are only affected depending on the details of
13863 their platform's memory allocator. Fixes bug 21018; bugfix on
13864 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
13865 2016-12-002 and as CVE-2016-1254.
13867 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
13868 - Stop a crash that could occur when a client running with DNSPort
13869 received a query with multiple address types, and the first
13870 address type was not supported. Found and fixed by Scott Dial.
13871 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
13873 o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
13874 - Fix an error that could cause us to read 4 bytes before the
13875 beginning of an openssl string. This bug could be used to cause
13876 Tor to crash on systems with unusual malloc implementations, or
13877 systems with unusual hardening installed. Fixes bug 17404; bugfix
13880 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
13881 - Avoid a difficult-to-trigger heap corruption attack when extending
13882 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
13883 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
13884 Reported by Guido Vranken.
13886 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
13887 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
13888 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
13890 o Major bugfixes (guard selection, backport from 0.2.7.6):
13891 - Actually look at the Guard flag when selecting a new directory
13892 guard. When we implemented the directory guard design, we
13893 accidentally started treating all relays as if they have the Guard
13894 flag during guard selection, leading to weaker anonymity and worse
13895 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
13898 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
13899 - If OpenSSL fails to generate an RSA key, do not retain a dangling
13900 pointer to the previous (uninitialized) key value. The impact here
13901 should be limited to a difficult-to-trigger crash, if OpenSSL is
13902 running an engine that makes key generation failures possible, or
13903 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
13904 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
13907 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
13908 - Fix an integer underflow bug when comparing malformed Tor
13909 versions. This bug could crash Tor when built with
13910 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
13911 0.2.9.8, which were built with -ftrapv by default. In other cases
13912 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
13913 on 0.0.8pre1. Found by OSS-Fuzz.
13915 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
13916 - Make memwipe() do nothing when passed a NULL pointer or buffer of
13917 zero size. Check size argument to memwipe() for underflow. Fixes
13918 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
13921 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
13922 - Make Tor survive errors involving connections without a
13923 corresponding event object. Previously we'd fail with an
13924 assertion; now we produce a log message. Related to bug 16248.
13926 o Minor features (geoip):
13927 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
13930 o Minor bugfixes (compilation, backport from 0.2.7.6):
13931 - Fix a compilation warning with Clang 3.6: Do not check the
13932 presence of an address which can never be NULL. Fixes bug 17781.
13934 o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
13935 - Check for failures from crypto_early_init, and refuse to continue.
13936 A previous typo meant that we could keep going with an
13937 uninitialized crypto library, and would have OpenSSL initialize
13938 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
13939 when implementing ticket 4900. Patch by "teor".
13941 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
13942 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
13943 a client authorized hidden service. Fixes bug 15823; bugfix
13947 Changes in version 0.2.4.28 - 2017-03-03
13948 Tor 0.2.4.28 backports a number of security fixes from later Tor
13949 releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
13950 this release, if for some reason they cannot upgrade to a later
13953 Note that support for Tor 0.2.4.x is ending soon: we will not issue
13954 any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
13955 a Tor release series with long-term support, we recommend Tor 0.2.9.x.
13957 o Directory authority changes (backport from 0.2.8.5-rc):
13958 - Urras is no longer a directory authority. Closes ticket 19271.
13960 o Directory authority changes (backport from 0.2.9.2-alpha):
13961 - The "Tonga" bridge authority has been retired; the new bridge
13962 authority is "Bifroest". Closes tickets 19728 and 19690.
13964 o Directory authority key updates (backport from 0.2.8.1-alpha):
13965 - Update the V3 identity key for the dannenberg directory authority:
13966 it was changed on 18 November 2015. Closes task 17906. Patch
13969 o Major features (security fixes, backport from 0.2.9.4-alpha):
13970 - Prevent a class of security bugs caused by treating the contents
13971 of a buffer chunk as if they were a NUL-terminated string. At
13972 least one such bug seems to be present in all currently used
13973 versions of Tor, and would allow an attacker to remotely crash
13974 most Tor instances, especially those compiled with extra compiler
13975 hardening. With this defense in place, such bugs can't crash Tor,
13976 though we should still fix them as they occur. Closes ticket
13977 20384 (TROVE-2016-10-001).
13979 o Major bugfixes (parsing, security, backport from 0.2.9.8):
13980 - Fix a bug in parsing that could cause clients to read a single
13981 byte past the end of an allocated region. This bug could be used
13982 to cause hardened clients (built with --enable-expensive-hardening)
13983 to crash if they tried to visit a hostile hidden service. Non-
13984 hardened clients are only affected depending on the details of
13985 their platform's memory allocator. Fixes bug 21018; bugfix on
13986 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
13987 2016-12-002 and as CVE-2016-1254.
13989 o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
13990 - Fix an error that could cause us to read 4 bytes before the
13991 beginning of an openssl string. This bug could be used to cause
13992 Tor to crash on systems with unusual malloc implementations, or
13993 systems with unusual hardening installed. Fixes bug 17404; bugfix
13996 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
13997 - Avoid a difficult-to-trigger heap corruption attack when extending
13998 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
13999 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
14000 Reported by Guido Vranken.
14002 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
14003 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
14004 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
14006 o Major bugfixes (guard selection, backport from 0.2.7.6):
14007 - Actually look at the Guard flag when selecting a new directory
14008 guard. When we implemented the directory guard design, we
14009 accidentally started treating all relays as if they have the Guard
14010 flag during guard selection, leading to weaker anonymity and worse
14011 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
14014 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
14015 - If OpenSSL fails to generate an RSA key, do not retain a dangling
14016 pointer to the previous (uninitialized) key value. The impact here
14017 should be limited to a difficult-to-trigger crash, if OpenSSL is
14018 running an engine that makes key generation failures possible, or
14019 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
14020 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
14023 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
14024 - Fix an integer underflow bug when comparing malformed Tor
14025 versions. This bug could crash Tor when built with
14026 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
14027 0.2.9.8, which were built with -ftrapv by default. In other cases
14028 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
14029 on 0.0.8pre1. Found by OSS-Fuzz.
14031 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
14032 - Make memwipe() do nothing when passed a NULL pointer or buffer of
14033 zero size. Check size argument to memwipe() for underflow. Fixes
14034 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
14037 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
14038 - Make Tor survive errors involving connections without a
14039 corresponding event object. Previously we'd fail with an
14040 assertion; now we produce a log message. Related to bug 16248.
14042 o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
14043 - Make it harder for attackers to overload hidden services with
14044 introductions, by blocking multiple introduction requests on the
14045 same circuit. Resolves ticket 15515.
14047 o Minor features (geoip):
14048 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
14051 o Minor bugfixes (compilation, backport from 0.2.7.6):
14052 - Fix a compilation warning with Clang 3.6: Do not check the
14053 presence of an address which can never be NULL. Fixes bug 17781.
14055 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
14056 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
14057 a client authorized hidden service. Fixes bug 15823; bugfix
14061 Changes in version 0.2.9.10 - 2017-03-01
14062 Tor 0.2.9.10 backports a security fix from later Tor release. It also
14063 includes fixes for some major issues affecting directory authorities,
14064 LibreSSL compatibility, and IPv6 correctness.
14066 The Tor 0.2.9.x release series is now marked as a long-term-support
14067 series. We intend to backport security fixes to 0.2.9.x until at
14068 least January of 2020.
14070 o Major bugfixes (directory authority, 0.3.0.3-alpha):
14071 - During voting, when marking a relay as a probable sybil, do not
14072 clear its BadExit flag: sybils can still be bad in other ways
14073 too. (We still clear the other flags.) Fixes bug 21108; bugfix
14076 o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
14077 - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
14078 any IPv6 addresses. Instead, only reject a port over IPv6 if the
14079 exit policy rejects that port on more than an IPv6 /16 of
14080 addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
14081 which rejected a relay's own IPv6 address by default. Fixes bug
14082 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
14084 o Major bugfixes (parsing, also in 0.3.0.4-rc):
14085 - Fix an integer underflow bug when comparing malformed Tor
14086 versions. This bug could crash Tor when built with
14087 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
14088 0.2.9.8, which were built with -ftrapv by default. In other cases
14089 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
14090 on 0.0.8pre1. Found by OSS-Fuzz.
14092 o Minor features (directory authorities, also in 0.3.0.4-rc):
14093 - Directory authorities now reject descriptors that claim to be
14094 malformed versions of Tor. Helps prevent exploitation of
14096 - Reject version numbers with components that exceed INT32_MAX.
14097 Otherwise 32-bit and 64-bit platforms would behave inconsistently.
14098 Fixes bug 21450; bugfix on 0.0.8pre1.
14100 o Minor features (geoip):
14101 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
14104 o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
14105 - Autoconf now checks to determine if OpenSSL structures are opaque,
14106 instead of explicitly checking for OpenSSL version numbers. Part
14108 - Support building with recent LibreSSL code that uses opaque
14109 structures. Closes ticket 21359.
14111 o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
14112 - Repair a couple of (unreachable or harmless) cases of the risky
14113 comparison-by-subtraction pattern that caused bug 21278.
14115 o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
14116 - The tor-resolve command line tool now rejects hostnames over 255
14117 characters in length. Previously, it would silently truncate them,
14118 which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
14119 Patch by "junglefowl".
14122 Changes in version 0.2.9.9 - 2017-01-23
14123 Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
14124 cause relays and clients to crash, even if they were not built with
14125 the --enable-expensive-hardening option. This bug affects all 0.2.9.x
14126 versions, and also affects 0.3.0.1-alpha: all relays running an affected
14127 version should upgrade.
14129 This release also resolves a client-side onion service reachability
14130 bug, and resolves a pair of small portability issues.
14132 o Major bugfixes (security):
14133 - Downgrade the "-ftrapv" option from "always on" to "only on when
14134 --enable-expensive-hardening is provided." This hardening option,
14135 like others, can turn survivable bugs into crashes -- and having
14136 it on by default made a (relatively harmless) integer overflow bug
14137 into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
14138 bugfix on 0.2.9.1-alpha.
14140 o Major bugfixes (client, onion service):
14141 - Fix a client-side onion service reachability bug, where multiple
14142 socks requests to an onion service (or a single slow request)
14143 could cause us to mistakenly mark some of the service's
14144 introduction points as failed, and we cache that failure so
14145 eventually we run out and can't reach the service. Also resolves a
14146 mysterious "Remote server sent bogus reason code 65021" log
14147 warning. The bug was introduced in ticket 17218, where we tried to
14148 remember the circuit end reason as a uint16_t, which mangled
14149 negative values. Partially fixes bug 21056 and fixes bug 20307;
14150 bugfix on 0.2.8.1-alpha.
14152 o Minor features (geoip):
14153 - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
14156 o Minor bugfixes (portability):
14157 - Avoid crashing when Tor is built using headers that contain
14158 CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
14159 without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
14161 - Fix Libevent detection on platforms without Libevent 1 headers
14162 installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
14165 Changes in version 0.2.8.12 - 2016-12-19
14166 Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
14167 below) where Tor clients could crash when attempting to visit a
14168 hostile hidden service. Clients are recommended to upgrade as packages
14169 become available for their systems.
14171 It also includes an updated list of fallback directories, backported
14174 Now that the Tor 0.2.9 series is stable, only major bugfixes will be
14175 backported to 0.2.8 in the future.
14177 o Major bugfixes (parsing, security, backported from 0.2.9.8):
14178 - Fix a bug in parsing that could cause clients to read a single
14179 byte past the end of an allocated region. This bug could be used
14180 to cause hardened clients (built with --enable-expensive-hardening)
14181 to crash if they tried to visit a hostile hidden service. Non-
14182 hardened clients are only affected depending on the details of
14183 their platform's memory allocator. Fixes bug 21018; bugfix on
14184 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
14185 2016-12-002 and as CVE-2016-1254.
14187 o Minor features (fallback directory list, backported from 0.2.9.8):
14188 - Replace the 81 remaining fallbacks of the 100 originally
14189 introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
14190 fallbacks (123 new, 54 existing, 27 removed) generated in December
14191 2016. Resolves ticket 20170.
14193 o Minor features (geoip, backported from 0.2.9.7-rc):
14194 - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
14198 Changes in version 0.2.9.8 - 2016-12-19
14199 Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
14201 The Tor 0.2.9 series makes mandatory a number of security features
14202 that were formerly optional. It includes support for a new shared-
14203 randomness protocol that will form the basis for next generation
14204 hidden services, includes a single-hop hidden service mode for
14205 optimizing .onion services that don't actually want to be hidden,
14206 tries harder not to overload the directory authorities with excessive
14207 downloads, and supports a better protocol versioning scheme for
14208 improved compatibility with other implementations of the Tor protocol.
14210 And of course, there are numerous other bugfixes and improvements.
14212 This release also includes a fix for a medium-severity issue (bug
14213 21018 below) where Tor clients could crash when attempting to visit a
14214 hostile hidden service. Clients are recommended to upgrade as packages
14215 become available for their systems.
14217 Below are listed the changes since Tor 0.2.8.11. For a list of
14218 changes since 0.2.9.7-rc, see the ChangeLog file.
14220 o New system requirements:
14221 - When building with OpenSSL, Tor now requires version 1.0.1 or
14222 later. OpenSSL 1.0.0 and earlier are no longer supported by the
14223 OpenSSL team, and should not be used. Closes ticket 20303.
14224 - Tor now requires Libevent version 2.0.10-stable or later. Older
14225 versions of Libevent have less efficient backends for several
14226 platforms, and lack the DNS code that we use for our server-side
14227 DNS support. This implements ticket 19554.
14228 - Tor now requires zlib version 1.2 or later, for security,
14229 efficiency, and (eventually) gzip support. (Back when we started,
14230 zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
14231 released in 2003. We recommend the latest version.)
14233 o Deprecated features:
14234 - A number of DNS-cache-related sub-options for client ports are now
14235 deprecated for security reasons, and may be removed in a future
14236 version of Tor. (We believe that client-side DNS caching is a bad
14237 idea for anonymity, and you should not turn it on.) The options
14238 are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
14239 UseIPv4Cache, and UseIPv6Cache.
14240 - A number of options are deprecated for security reasons, and may
14241 be removed in a future version of Tor. The options are:
14242 AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
14243 AllowSingleHopExits, ClientDNSRejectInternalAddresses,
14244 CloseHSClientCircuitsImmediatelyOnTimeout,
14245 CloseHSServiceRendCircuitsImmediatelyOnTimeout,
14246 ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
14247 UseNTorHandshake, and WarnUnsafeSocks.
14248 - The *ListenAddress options are now deprecated as unnecessary: the
14249 corresponding *Port options should be used instead. These options
14250 may someday be removed. The affected options are:
14251 ControlListenAddress, DNSListenAddress, DirListenAddress,
14252 NATDListenAddress, ORListenAddress, SocksListenAddress,
14253 and TransListenAddress.
14255 o Major bugfixes (parsing, security, new since 0.2.9.7-rc):
14256 - Fix a bug in parsing that could cause clients to read a single
14257 byte past the end of an allocated region. This bug could be used
14258 to cause hardened clients (built with --enable-expensive-hardening)
14259 to crash if they tried to visit a hostile hidden service. Non-
14260 hardened clients are only affected depending on the details of
14261 their platform's memory allocator. Fixes bug 21018; bugfix on
14262 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
14263 2016-12-002 and as CVE-2016-1254.
14265 o Major features (build, hardening):
14266 - Tor now builds with -ftrapv by default on compilers that support
14267 it. This option detects signed integer overflow (which C forbids),
14268 and turns it into a hard-failure. We do not apply this option to
14269 code that needs to run in constant time to avoid side-channels;
14270 instead, we use -fwrapv in that code. Closes ticket 17983.
14271 - When --enable-expensive-hardening is selected, stop applying the
14272 clang/gcc sanitizers to code that needs to run in constant time.
14273 Although we are aware of no introduced side-channels, we are not
14274 able to prove that there are none. Related to ticket 17983.
14276 o Major features (circuit building, security):
14277 - Authorities, relays, and clients now require ntor keys in all
14278 descriptors, for all hops (except for rare hidden service protocol
14279 cases), for all circuits, and for all other roles. Part of
14281 - Authorities, relays, and clients only use ntor, except for
14282 rare cases in the hidden service protocol. Part of ticket 19163.
14284 o Major features (compilation):
14285 - Our big list of extra GCC warnings is now enabled by default when
14286 building with GCC (or with anything like Clang that claims to be
14287 GCC-compatible). To make all warnings into fatal compilation
14288 errors, pass --enable-fatal-warnings to configure. Closes
14290 - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
14291 turn on C and POSIX extensions. (Previously, we attempted to do
14292 this on an ad hoc basis.) Closes ticket 19139.
14294 o Major features (directory authorities, hidden services):
14295 - Directory authorities can now perform the shared randomness
14296 protocol specified by proposal 250. Using this protocol, directory
14297 authorities generate a global fresh random value every day. In the
14298 future, this value will be used by hidden services to select
14299 HSDirs. This release implements the directory authority feature;
14300 the hidden service side will be implemented in the future as part
14301 of proposal 224. Resolves ticket 16943; implements proposal 250.
14303 o Major features (downloading, random exponential backoff):
14304 - When we fail to download an object from a directory service, wait
14305 for an (exponentially increasing) randomized amount of time before
14306 retrying, rather than a fixed interval as we did before. This
14307 prevents a group of Tor instances from becoming too synchronized,
14308 or a single Tor instance from becoming too predictable, in its
14309 download schedule. Closes ticket 15942.
14311 o Major features (resource management):
14312 - Tor can now notice it is about to run out of sockets, and
14313 preemptively close connections of lower priority. (This feature is
14314 off by default for now, since the current prioritizing method is
14315 yet not mature enough. You can enable it by setting
14316 "DisableOOSCheck 0", but watch out: it might close some sockets
14317 you would rather have it keep.) Closes ticket 18640.
14319 o Major features (single-hop "hidden" services):
14320 - Add experimental HiddenServiceSingleHopMode and
14321 HiddenServiceNonAnonymousMode options. When both are set to 1,
14322 every hidden service on that Tor instance becomes a non-anonymous
14323 Single Onion Service. Single Onions make one-hop (direct)
14324 connections to their introduction and rendezvous points. One-hop
14325 circuits make Single Onion servers easily locatable, but clients
14326 remain location-anonymous. This is compatible with the existing
14327 hidden service implementation, and works on the current Tor
14328 network without any changes to older relays or clients. Implements
14329 proposal 260, completes ticket 17178. Patch by teor and asn.
14331 o Major features (subprotocol versions):
14332 - Tor directory authorities now vote on a set of recommended
14333 "subprotocol versions", and on a set of required subprotocol
14334 versions. Clients and relays that lack support for a _required_
14335 subprotocol version will not start; those that lack support for a
14336 _recommended_ subprotocol version will warn the user to upgrade.
14337 This change allows compatible implementations of the Tor protocol(s)
14338 to exist without pretending to be 100% bug-compatible with
14339 particular releases of Tor itself. Closes ticket 19958; implements
14340 part of proposal 264.
14342 o Major bugfixes (circuit building):
14343 - Hidden service client-to-intro-point and service-to-rendezvous-
14344 point circuits use the TAP key supplied by the protocol, to avoid
14345 epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
14347 o Major bugfixes (download scheduling):
14348 - Avoid resetting download status for consensuses hourly, since we
14349 already have another, smarter retry mechanism. Fixes bug 8625;
14350 bugfix on 0.2.0.9-alpha.
14351 - If a consensus expires while we are waiting for certificates to
14352 download, stop waiting for certificates.
14353 - If we stop waiting for certificates less than a minute after we
14354 started downloading them, do not consider the certificate download
14355 failure a separate failure. Fixes bug 20533; bugfix
14357 - When using exponential backoff in test networks, use a lower
14358 exponent, so the delays do not vary as much. This helps test
14359 networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
14361 o Major bugfixes (exit policies):
14362 - Avoid disclosing exit outbound bind addresses, configured port
14363 bind addresses, and local interface addresses in relay descriptors
14364 by default under ExitPolicyRejectPrivate. Instead, only reject
14365 these (otherwise unlisted) addresses if
14366 ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
14367 0.2.7.2-alpha. Patch by teor.
14369 o Major bugfixes (hidden services):
14370 - Allow Tor clients with appropriate controllers to work with
14371 FetchHidServDescriptors set to 0. Previously, this option also
14372 disabled descriptor cache lookup, thus breaking hidden services
14373 entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
14374 - Clients now require hidden services to include the TAP keys for
14375 their intro points in the hidden service descriptor. This prevents
14376 an inadvertent upgrade to ntor, which a malicious hidden service
14377 could use to distinguish clients by consensus version. Fixes bug
14378 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
14380 o Major bugfixes (relay, resolver, logging):
14381 - For relays that don't know their own address, avoid attempting a
14382 local hostname resolve for each descriptor we download. This
14383 will cut down on the number of "Success: chose address 'x.x.x.x'"
14384 log lines, and also avoid confusing clock jumps if the resolver
14385 is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
14387 o Minor features (port flags):
14388 - Add new flags to the *Port options to give finer control over which
14389 requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
14390 and the synthetic flag OnionTrafficOnly, which is equivalent to
14391 NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
14392 18693; patch by "teor".
14394 o Minor features (build, hardening):
14395 - Detect and work around a libclang_rt problem that would prevent
14396 clang from finding __mulodi4() on some 32-bit platforms, and thus
14397 keep -ftrapv from linking on those systems. Closes ticket 19079.
14398 - When building on a system without runtime support for the runtime
14399 hardening options, try to log a useful warning at configuration
14400 time, rather than an incomprehensible warning at link time. If
14401 expensive hardening was requested, this warning becomes an error.
14402 Closes ticket 18895.
14404 o Minor features (client, directory):
14405 - Since authorities now omit all routers that lack the Running and
14406 Valid flags, we assume that any relay listed in the consensus must
14407 have those flags. Closes ticket 20001; implements part of
14410 o Minor features (code safety):
14411 - In our integer-parsing functions, ensure that the maximum value we
14412 allow is no smaller than the minimum value. Closes ticket 19063;
14413 patch from "U+039b".
14415 o Minor features (compilation, portability):
14416 - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
14419 o Minor features (config):
14420 - Warn users when descriptor and port addresses are inconsistent.
14421 Mitigates bug 13953; patch by teor.
14423 o Minor features (controller):
14424 - Allow controllers to configure basic client authorization on
14425 hidden services when they create them with the ADD_ONION controller
14426 command. Implements ticket 15588. Patch by "special".
14427 - Fire a STATUS_SERVER controller event whenever the hibernation
14428 status changes between "awake"/"soft"/"hard". Closes ticket 18685.
14429 - Implement new GETINFO queries for all downloads that use
14430 download_status_t to schedule retries. This allows controllers to
14431 examine the schedule for pending downloads. Closes ticket 19323.
14433 o Minor features (development tools, etags):
14434 - Teach the "make tags" Makefile target how to correctly find
14435 "MOCK_IMPL" function definitions. Patch from nherring; closes
14438 o Minor features (directory authority):
14439 - After voting, if the authorities decide that a relay is not
14440 "Valid", they no longer include it in the consensus at all. Closes
14441 ticket 20002; implements part of proposal 272.
14442 - Directory authorities now only give the Guard flag to a relay if
14443 they are also giving it the Stable flag. This change allows us to
14444 simplify path selection for clients. It should have minimal effect
14445 in practice, since >99% of Guards already have the Stable flag.
14446 Implements ticket 18624.
14447 - Directory authorities now write their v3-status-votes file out to
14448 disk earlier in the consensus process, so we have a record of the
14449 votes even if we abort the consensus process. Resolves
14452 o Minor features (fallback directory list, new since 0.2.9.7-rc):
14453 - Replace the 81 remaining fallbacks of the 100 originally
14454 introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
14455 fallbacks (123 new, 54 existing, 27 removed) generated in December
14456 2016. Resolves ticket 20170.
14458 o Minor features (hidden service):
14459 - Stop being so strict about the payload length of "rendezvous1"
14460 cells. We used to be locked in to the "TAP" handshake length, and
14461 now we can handle better handshakes like "ntor". Resolves
14464 o Minor features (infrastructure, time):
14465 - Tor now includes an improved timer backend, so that we can
14466 efficiently support tens or hundreds of thousands of concurrent
14467 timers, as will be needed for some of our planned anti-traffic-
14468 analysis work. This code is based on William Ahern's "timeout.c"
14469 project, which implements a "tickless hierarchical timing wheel".
14470 Closes ticket 18365.
14471 - Tor now uses the operating system's monotonic timers (where
14472 available) for internal fine-grained timing. Previously we would
14473 look at the system clock, and then attempt to compensate for the
14474 clock running backwards. Closes ticket 18908.
14476 o Minor features (logging):
14477 - Add a set of macros to check nonfatal assertions, for internal
14478 use. Migrating more of our checks to these should help us avoid
14479 needless crash bugs. Closes ticket 18613.
14480 - Provide a more useful warning message when configured with an
14481 invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
14482 - When dumping unparseable router descriptors, optionally store them
14483 in separate files, named by digest, up to a configurable size
14484 limit. You can change the size limit by setting the
14485 MaxUnparseableDescSizeToLog option, and disable this feature by
14486 setting that option to 0. Closes ticket 18322.
14488 o Minor features (performance):
14489 - Change the "optimistic data" extension from "off by default" to
14490 "on by default". The default was ordinarily overridden by a
14491 consensus option, but when clients were bootstrapping for the
14492 first time, they would not have a consensus to get the option
14493 from. Changing this default saves a round-trip during startup.
14494 Closes ticket 18815.
14496 o Minor features (relay, usability):
14497 - When the directory authorities refuse a bad relay's descriptor,
14498 encourage the relay operator to contact us. Many relay operators
14499 won't notice this line in their logs, but it's a win if even a few
14500 learn why we don't like what their relay was doing. Resolves
14503 o Minor features (security, TLS):
14504 - Servers no longer support clients that lack AES ciphersuites.
14505 (3DES is no longer considered an acceptable cipher.) We believe
14506 that no such Tor clients currently exist, since Tor has required
14507 OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
14509 o Minor features (testing):
14510 - Disable memory protections on OpenBSD when performing our unit
14511 tests for memwipe(). The test deliberately invokes undefined
14512 behavior, and the OpenBSD protections interfere with this. Patch
14513 from "rubiate". Closes ticket 20066.
14514 - Move the test-network.sh script to chutney, and modify tor's test-
14515 network.sh to call the (newer) chutney version when available.
14516 Resolves ticket 19116. Patch by teor.
14517 - Use the lcov convention for marking lines as unreachable, so that
14518 we don't count them when we're generating test coverage data.
14519 Update our coverage tools to understand this convention. Closes
14521 - Our link-handshake unit tests now check that when invalid
14522 handshakes fail, they fail with the error messages we expected.
14523 - Our unit testing code that captures log messages no longer
14524 prevents them from being written out if the user asked for them
14525 (by passing --debug or --info or --notice or --warn to the "test"
14526 binary). This change prevents us from missing unexpected log
14527 messages simply because we were looking for others. Related to
14529 - The unit tests now log all warning messages with the "BUG" flag.
14530 Previously, they only logged errors by default. This change will
14531 help us make our testing code more correct, and make sure that we
14532 only hit this code when we mean to. In the meantime, however,
14533 there will be more warnings in the unit test logs than before.
14534 This is preparatory work for ticket 19999.
14535 - The unit tests now treat any failure of a "tor_assert_nonfatal()"
14536 assertion as a test failure.
14537 - We've done significant work to make the unit tests run faster.
14539 o Minor features (testing, ipv6):
14540 - Add the hs-ipv6 chutney target to make test-network-all's IPv6
14541 tests. Remove bridges+hs, as it's somewhat redundant. This
14542 requires a recent chutney version that supports IPv6 clients,
14543 relays, and authorities. Closes ticket 20069; patch by teor.
14544 - Add the single-onion and single-onion-ipv6 chutney targets to
14545 "make test-network-all". This requires a recent chutney version
14546 with the single onion network flavors (git c72a652 or later).
14547 Closes ticket 20072; patch by teor.
14549 o Minor features (Tor2web):
14550 - Make Tor2web clients respect ReachableAddresses. This feature was
14551 inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
14552 0.2.8.7. Implements feature 20034. Patch by teor.
14554 o Minor features (unix domain sockets):
14555 - When configuring a unix domain socket for a SocksPort,
14556 ControlPort, or Hidden service, you can now wrap the address in
14557 quotes, using C-style escapes inside the quotes. This allows unix
14558 domain socket paths to contain spaces. Resolves ticket 18753.
14560 o Minor features (user interface):
14561 - Tor now supports the ability to declare options deprecated, so
14562 that we can recommend that people stop using them. Previously, this
14563 was done in an ad-hoc way. There is a new --list-deprecated-options
14564 command-line option to list all of the deprecated options. Closes
14567 o Minor features (virtual addresses):
14568 - Increase the maximum number of bits for the IPv6 virtual network
14569 prefix from 16 to 104. In this way, the condition for address
14570 allocation is less restrictive. Closes ticket 20151; feature
14573 o Minor bug fixes (circuits):
14574 - Use the CircuitBuildTimeout option whenever
14575 LearnCircuitBuildTimeout is disabled. Previously, we would respect
14576 the option when a user disabled it, but not when it was disabled
14577 because some other option was set. Fixes bug 20073; bugfix on
14578 0.2.4.12-alpha. Patch by teor.
14580 o Minor bugfixes (build):
14581 - The current Git revision when building from a local repository is
14582 now detected correctly when using git worktrees. Fixes bug 20492;
14583 bugfix on 0.2.3.9-alpha.
14585 o Minor bugfixes (relay address discovery):
14586 - Stop reordering IP addresses returned by the OS. This makes it
14587 more likely that Tor will guess the same relay IP address every
14588 time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
14589 Reported by René Mayrhofer, patch by "cypherpunks".
14591 o Minor bugfixes (memory allocation):
14592 - Change how we allocate memory for large chunks on buffers, to
14593 avoid a (currently impossible) integer overflow, and to waste less
14594 space when allocating unusually large chunks. Fixes bug 20081;
14595 bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
14597 o Minor bugfixes (bootstrap):
14598 - Remember the directory server we fetched the consensus or previous
14599 certificates from, and use it to fetch future authority
14600 certificates. This change improves bootstrapping performance.
14601 Fixes bug 18963; bugfix on 0.2.8.1-alpha.
14603 o Minor bugfixes (circuits):
14604 - Make sure extend_info_from_router() is only called on servers.
14605 Fixes bug 19639; bugfix on 0.2.8.1-alpha.
14607 o Minor bugfixes (client, fascistfirewall):
14608 - Avoid spurious warnings when ReachableAddresses or FascistFirewall
14609 is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
14611 o Minor bugfixes (client, unix domain sockets):
14612 - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
14613 the client address is meaningless. Fixes bug 20261; bugfix
14616 o Minor bugfixes (code style):
14617 - Fix an integer signedness conversion issue in the case conversion
14618 tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
14620 o Minor bugfixes (compilation):
14621 - Build correctly on versions of libevent2 without support for
14622 evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
14624 - When building with Clang, use a full set of GCC warnings.
14625 (Previously, we included only a subset, because of the way we
14626 detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
14627 - Detect Libevent2 functions correctly on systems that provide
14628 libevent2, but where libevent1 is linked with -levent. Fixes bug
14629 19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
14630 - Run correctly when built on Windows build environments that
14631 require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
14633 o Minor bugfixes (configuration):
14634 - When parsing quoted configuration values from the torrc file,
14635 handle Windows line endings correctly. Fixes bug 19167; bugfix on
14636 0.2.0.16-alpha. Patch from "Pingl".
14638 o Minor bugfixes (directory authority):
14639 - Authorities now sort the "package" lines in their votes, for ease
14640 of debugging. (They are already sorted in consensus documents.)
14641 Fixes bug 18840; bugfix on 0.2.6.3-alpha.
14642 - Die with a more useful error when the operator forgets to place
14643 the authority_signing_key file into the keys directory. This
14644 avoids an uninformative assert & traceback about having an invalid
14645 key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
14646 - When allowing private addresses, mark Exits that only exit to
14647 private locations as such. Fixes bug 20064; bugfix
14649 - When parsing a detached signature, make sure we use the length of
14650 the digest algorithm instead of a hardcoded DIGEST256_LEN in
14651 order to avoid comparing bytes out-of-bounds with a smaller digest
14652 length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
14654 o Minor bugfixes (getpass):
14655 - Defensively fix a non-triggerable heap corruption at do_getpass()
14656 to protect ourselves from mistakes in the future. Fixes bug
14657 19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
14660 o Minor bugfixes (guard selection):
14661 - Don't mark guards as unreachable if connection_connect() fails.
14662 That function fails for local reasons, so it shouldn't reveal
14663 anything about the status of the guard. Fixes bug 14334; bugfix
14665 - Use a single entry guard even if the NumEntryGuards consensus
14666 parameter is not provided. Fixes bug 17688; bugfix
14669 o Minor bugfixes (hidden services):
14670 - Increase the minimum number of internal circuits we preemptively
14671 build from 2 to 3, so a circuit is available when a client
14672 connects to another onion service. Fixes bug 13239; bugfix
14674 - Allow hidden services to run on IPv6 addresses even when the
14675 IPv6Exit option is not set. Fixes bug 18357; bugfix
14677 - Stop logging intro point details to the client log on certain
14678 error conditions. Fixed as part of bug 20012; bugfix on
14679 0.2.4.8-alpha. Patch by teor.
14680 - When deleting an ephemeral hidden service, close its intro points
14681 even if they are not completely open. Fixes bug 18604; bugfix
14683 - When configuring hidden services, check every hidden service
14684 directory's permissions. Previously, we only checked the last
14685 hidden service. Fixes bug 20529; bugfix on 0.2.6.2-alpha.
14687 o Minor bugfixes (IPv6, testing):
14688 - Check for IPv6 correctly on Linux when running test networks.
14689 Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
14691 o Minor bugfixes (Linux seccomp2 sandbox):
14692 - Add permission to run the sched_yield() and sigaltstack() system
14693 calls, in order to support versions of Tor compiled with asan or
14694 ubsan code that use these calls. Now "sandbox 1" and
14695 "--enable-expensive-hardening" should be compatible on more
14696 systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
14698 o Minor bugfixes (logging):
14699 - Downgrade a harmless log message about the
14700 pending_entry_connections list from "warn" to "info". Mitigates
14702 - Log a more accurate message when we fail to dump a microdescriptor.
14703 Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
14704 - When logging a directory ownership mismatch, log the owning
14705 username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
14706 - When we are unable to remove the bw_accounting file, do not warn
14707 if the reason we couldn't remove it was that it didn't exist.
14708 Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from pastly.
14710 o Minor bugfixes (memory leak):
14711 - Fix a series of slow memory leaks related to parsing torrc files
14712 and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
14713 - Avoid a small memory leak when informing worker threads about
14714 rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
14715 - Fix a small memory leak when receiving AF_UNIX connections on a
14716 SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
14717 - When moving a signed descriptor object from a source to an
14718 existing destination, free the allocated memory inside that
14719 destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
14720 - Fix a memory leak and use-after-free error when removing entries
14721 from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
14722 0.2.5.5-alpha. Patch from "cypherpunks".
14723 - Fix a small, uncommon memory leak that could occur when reading a
14724 truncated ed25519 key file. Fixes bug 18956; bugfix
14727 o Minor bugfixes (option parsing):
14728 - Count unix sockets when counting client listeners (SOCKS, Trans,
14729 NATD, and DNS). This has no user-visible behavior changes: these
14730 options are set once, and never read. Required for correct
14731 behavior in ticket 17178. Fixes bug 19677; bugfix on
14732 0.2.6.3-alpha. Patch by teor.
14734 o Minor bugfixes (options):
14735 - Check the consistency of UseEntryGuards and EntryNodes more
14736 reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
14738 - Stop changing the configured value of UseEntryGuards on
14739 authorities and Tor2web clients. Fixes bug 20074; bugfix on
14740 commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
14743 o Minor bugfixes (relay):
14744 - Ensure relays don't make multiple connections during bootstrap.
14745 Fixes bug 20591; bugfix on 0.2.8.1-alpha.
14746 - Do not try to parallelize workers more than 16x without the user
14747 explicitly configuring us to do so, even if we do detect more than
14748 16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
14750 o Minor bugfixes (testing):
14751 - The test-stem and test-network makefile targets now depend only on
14752 the tor binary that they are testing. Previously, they depended on
14753 "make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
14754 patch from "cypherpunks".
14755 - Allow clients to retry HSDirs much faster in test networks. Fixes
14756 bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
14757 - Avoid a unit test failure on systems with over 16 detectable CPU
14758 cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
14759 - Let backtrace tests work correctly under AddressSanitizer:
14760 disable ASAN's detection of segmentation faults while running
14761 test_bt.sh, so that we can make sure that our own backtrace
14762 generation code works. Fixes bug 18934; bugfix
14763 on 0.2.5.2-alpha. Patch from "cypherpunks".
14764 - Fix the test-network-all target on out-of-tree builds by using the
14765 correct path to the test driver script. Fixes bug 19421; bugfix
14767 - Stop spurious failures in the local interface address discovery
14768 unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
14770 - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
14771 removed the ECDH ciphers which caused the tests to fail on
14772 platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
14773 - The tor_tls_server_info_callback unit test no longer crashes when
14774 debug-level logging is turned on. Fixes bug 20041; bugfix
14777 o Minor bugfixes (time):
14778 - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
14779 bugfix on all released tor versions.
14780 - When computing the difference between two times in milliseconds,
14781 we now round to the nearest millisecond correctly. Previously, we
14782 could sometimes round in the wrong direction. Fixes bug 19428;
14783 bugfix on 0.2.2.2-alpha.
14785 o Minor bugfixes (Tor2web):
14786 - Prevent Tor2web clients from running hidden services: these services
14787 are not anonymous due to the one-hop client paths. Fixes bug
14788 19678. Patch by teor.
14790 o Minor bugfixes (user interface):
14791 - Display a more accurate number of suppressed messages in the log
14792 rate-limiter. Previously, there was a potential integer overflow
14793 in the counter. Now, if the number of messages hits a maximum, the
14794 rate-limiter doesn't count any further. Fixes bug 19435; bugfix
14796 - Fix a typo in the passphrase prompt for the ed25519 identity key.
14797 Fixes bug 19503; bugfix on 0.2.7.2-alpha.
14799 o Code simplification and refactoring:
14800 - Remove redundant declarations of the MIN macro. Closes
14802 - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
14803 Closes ticket 18462; patch from "icanhasaccount".
14804 - Split the 600-line directory_handle_command_get function into
14805 separate functions for different URL types. Closes ticket 16698.
14808 - Add module-level internal documentation for 36 C files that
14809 previously didn't have a high-level overview. Closes ticket 20385.
14810 - Correct the IPv6 syntax in our documentation for the
14811 VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
14812 - Correct the minimum bandwidth value in torrc.sample, and queue a
14813 corresponding change for torrc.minimal. Closes ticket 20085.
14814 - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
14815 ticket 19153. Patch from "U+039b".
14816 - Module-level documentation for several more modules. Closes
14817 tickets 19287 and 19290.
14818 - Document the --passphrase-fd option in the tor manpage. Fixes bug
14819 19504; bugfix on 0.2.7.3-rc.
14820 - Document the default PathsNeededToBuildCircuits value that's used
14821 by clients when the directory authorities don't set
14822 min_paths_for_circs_pct. Fixes bug 20117; bugfix on 0.2.4.10-alpha.
14823 Patch by teor, reported by Jesse V.
14824 - Fix manual for the User option: it takes a username, not a UID.
14825 Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
14827 - Fix the description of the --passphrase-fd option in the
14828 tor-gencert manpage. The option is used to pass the number of a
14829 file descriptor to read the passphrase from, not to read the file
14830 descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
14833 - We no longer include the (dead, deprecated) bufferevent code in
14834 Tor. Closes ticket 19450. Based on a patch from "U+039b".
14836 o Removed features:
14837 - Remove support for "GET /tor/bytes.txt" DirPort request, and
14838 "GETINFO dir-usage" controller request, which were only available
14839 via a compile-time option in Tor anyway. Feature was added in
14840 0.2.2.1-alpha. Resolves ticket 19035.
14841 - There is no longer a compile-time option to disable support for
14842 TransPort. (If you don't want TransPort, just don't use it.) Patch
14843 from "U+039b". Closes ticket 19449.
14846 - Run more workqueue tests as part of "make check". These had
14847 previously been implemented, but you needed to know special
14848 command-line options to enable them.
14849 - We now have unit tests for our code to reject zlib "compression
14850 bombs". (Fortunately, the code works fine.)
14853 Changes in version 0.2.8.11 - 2016-12-08
14854 Tor 0.2.8.11 backports fixes for additional portability issues that
14855 could prevent Tor from building correctly on OSX Sierra, or with
14856 OpenSSL 1.1. Affected users should upgrade; others can safely stay
14859 o Minor bugfixes (portability):
14860 - Avoid compilation errors when building on OSX Sierra. Sierra began
14861 to support the getentropy() and clock_gettime() APIs, but created
14862 a few problems in doing so. Tor 0.2.9 has a more thorough set of
14863 workarounds; in 0.2.8, we are just using the /dev/urandom and mach
14864 monotonic time interfaces. Fixes bug 20865. Bugfix
14867 o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
14868 - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
14869 architectures. Closes ticket 20588.
14872 Changes in version 0.2.8.10 - 2016-12-02
14873 Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
14874 unusable after they left standby mode. It also backports fixes for
14875 a few portability issues and a small but problematic memory leak.
14877 o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
14878 - When Tor leaves standby because of a new application request, open
14879 circuits as needed to serve that request. Previously, we would
14880 potentially wait a very long time. Fixes part of bug 19969; bugfix
14883 o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
14884 - Clients now respond to new application stream requests immediately
14885 when they arrive, rather than waiting up to one second before
14886 starting to handle them. Fixes part of bug 19969; bugfix
14889 o Minor bugfixes (portability, backport from 0.2.9.6-rc):
14890 - Work around a bug in the OSX 10.12 SDK that would prevent us from
14891 successfully targeting earlier versions of OSX. Resolves
14894 o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
14895 - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
14896 20551; bugfix on 0.2.1.1-alpha.
14898 o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
14899 - Work around a memory leak in OpenSSL 1.1 when encoding public
14900 keys. Fixes bug 20553; bugfix on 0.0.2pre8.
14902 o Minor features (geoip):
14903 - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
14907 Changes in version 0.2.8.9 - 2016-10-17
14908 Tor 0.2.8.9 backports a fix for a security hole in previous versions
14909 of Tor that would allow a remote attacker to crash a Tor client,
14910 hidden service, relay, or authority. All Tor users should upgrade to
14911 this version, or to 0.2.9.4-alpha. Patches will be released for older
14914 o Major features (security fixes, also in 0.2.9.4-alpha):
14915 - Prevent a class of security bugs caused by treating the contents
14916 of a buffer chunk as if they were a NUL-terminated string. At
14917 least one such bug seems to be present in all currently used
14918 versions of Tor, and would allow an attacker to remotely crash
14919 most Tor instances, especially those compiled with extra compiler
14920 hardening. With this defense in place, such bugs can't crash Tor,
14921 though we should still fix them as they occur. Closes ticket
14922 20384 (TROVE-2016-10-001).
14924 o Minor features (geoip):
14925 - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
14929 Changes in version 0.2.8.8 - 2016-09-23
14930 Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
14931 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
14932 who select public relays as their bridges.
14934 o Major bugfixes (crash):
14935 - Fix a complicated crash bug that could affect Tor clients
14936 configured to use bridges when replacing a networkstatus consensus
14937 in which one of their bridges was mentioned. OpenBSD users saw
14938 more crashes here, but all platforms were potentially affected.
14939 Fixes bug 20103; bugfix on 0.2.8.2-alpha.
14941 o Major bugfixes (relay, OOM handler):
14942 - Fix a timing-dependent assertion failure that could occur when we
14943 tried to flush from a circuit after having freed its cells because
14944 of an out-of-memory condition. Fixes bug 20203; bugfix on
14945 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
14948 o Minor feature (fallback directories):
14949 - Remove broken fallbacks from the hard-coded fallback directory
14950 list. Closes ticket 20190; patch by teor.
14952 o Minor features (geoip):
14953 - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
14957 Changes in version 0.2.8.7 - 2016-08-24
14958 Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
14959 option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
14960 who sets the ReachableAddresses option, and all bridges, are strongly
14961 encouraged to upgrade.
14963 o Directory authority changes:
14964 - The "Tonga" bridge authority has been retired; the new bridge
14965 authority is "Bifroest". Closes tickets 19728 and 19690.
14967 o Major bugfixes (client, security):
14968 - Only use the ReachableAddresses option to restrict the first hop
14969 in a path. In earlier versions of 0.2.8.x, it would apply to
14970 every hop in the path, with a possible degradation in anonymity
14971 for anyone using an uncommon ReachableAddress setting. Fixes bug
14972 19973; bugfix on 0.2.8.2-alpha.
14974 o Minor features (geoip):
14975 - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
14978 o Minor bugfixes (compilation):
14979 - Remove an inappropriate "inline" in tortls.c that was causing
14980 warnings on older versions of GCC. Fixes bug 19903; bugfix
14983 o Minor bugfixes (fallback directories):
14984 - Avoid logging a NULL string pointer when loading fallback
14985 directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
14986 and 0.2.8.1-alpha. Report and patch by "rubiate".
14989 Changes in version 0.2.8.6 - 2016-08-02
14991 Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
14993 The Tor 0.2.8 series improves client bootstrapping performance,
14994 completes the authority-side implementation of improved identity
14995 keys for relays, and includes numerous bugfixes and performance
14996 improvements throughout the program. This release continues to
14997 improve the coverage of Tor's test suite. For a full list of
14998 changes since Tor 0.2.7, see the ReleaseNotes file.
15000 Below is a list of the changes since Tor 0.2.7.
15002 o New system requirements:
15003 - Tor no longer attempts to support platforms where the "time_t"
15004 type is unsigned. (To the best of our knowledge, only OpenVMS does
15005 this, and Tor has never actually built on OpenVMS.) Closes
15007 - Tor no longer supports versions of OpenSSL with a broken
15008 implementation of counter mode. (This bug was present in OpenSSL
15009 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
15010 longer runs with, these versions.
15011 - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
15012 later (released in 2008 and 2009 respectively). If you are
15013 building Tor from the git repository instead of from the source
15014 distribution, and your tools are older than this, you will need to
15015 upgrade. Closes ticket 17732.
15017 o Directory authority changes:
15018 - Update the V3 identity key for the dannenberg directory authority:
15019 it was changed on 18 November 2015. Closes task 17906. Patch
15021 - Urras is no longer a directory authority. Closes ticket 19271.
15023 o Major features (directory system):
15024 - Include a trial list of default fallback directories, based on an
15025 opt-in survey of suitable relays. Doing this should make clients
15026 bootstrap more quickly and reliably, and reduce the load on the
15027 directory authorities. Closes ticket 15775. Patch by teor.
15028 Candidates identified using an OnionOO script by weasel, teor,
15029 gsathya, and karsten.
15030 - Previously only relays that explicitly opened a directory port
15031 (DirPort) accepted directory requests from clients. Now all
15032 relays, with and without a DirPort, accept and serve tunneled
15033 directory requests that they receive through their ORPort. You can
15034 disable this behavior using the new DirCache option. Closes
15036 - When bootstrapping multiple consensus downloads at a time, use the
15037 first one that starts downloading, and close the rest. This
15038 reduces failures when authorities or fallback directories are slow
15039 or down. Together with the code for feature 15775, this feature
15040 should reduces failures due to fallback churn. Implements ticket
15041 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
15042 mikeperry and teor.
15044 o Major features (security, Linux):
15045 - When Tor starts as root on Linux and is told to switch user ID, it
15046 can now retain the capability to bind to low ports. By default,
15047 Tor will do this only when it's switching user ID and some low
15048 ports have been configured. You can change this behavior with the
15049 new option KeepBindCapabilities. Closes ticket 8195.
15051 o Major bugfixes (client, bootstrapping):
15052 - Check if bootstrap consensus downloads are still needed when the
15053 linked connection attaches. This prevents tor making unnecessary
15054 begindir-style connections, which are the only directory
15055 connections tor clients make since the fix for 18483 was merged.
15056 - Fix some edge cases where consensus download connections may not
15057 have been closed, even though they were not needed. Related to fix
15059 - Make relays retry consensus downloads the correct number of times,
15060 rather than the more aggressive client retry count. Fixes part of
15063 o Major bugfixes (dns proxy mode, crash):
15064 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
15065 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
15067 o Major bugfixes (ed25519, voting):
15068 - Actually enable support for authorities to match routers by their
15069 Ed25519 identities. Previously, the code had been written, but
15070 some debugging code that had accidentally been left in the
15071 codebase made it stay turned off. Fixes bug 17702; bugfix
15073 - When collating votes by Ed25519 identities, authorities now
15074 include a "NoEdConsensus" flag if the ed25519 value (or lack
15075 thereof) for a server does not reflect the majority consensus.
15076 Related to bug 17668; bugfix on 0.2.7.2-alpha.
15077 - When generating a vote with keypinning disabled, never include two
15078 entries for the same ed25519 identity. This bug was causing
15079 authorities to generate votes that they could not parse when a
15080 router violated key pinning by changing its RSA identity but
15081 keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
15082 18318. Bugfix on 0.2.7.2-alpha.
15084 o Major bugfixes (key management):
15085 - If OpenSSL fails to generate an RSA key, do not retain a dangling
15086 pointer to the previous (uninitialized) key value. The impact here
15087 should be limited to a difficult-to-trigger crash, if OpenSSL is
15088 running an engine that makes key generation failures possible, or
15089 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
15090 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
15093 o Major bugfixes (security, client, DNS proxy):
15094 - Stop a crash that could occur when a client running with DNSPort
15095 received a query with multiple address types, and the first
15096 address type was not supported. Found and fixed by Scott Dial.
15097 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
15099 o Major bugfixes (security, compilation):
15100 - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
15101 is predefined. Previously, our use of -D_FORTIFY_SOURCE would
15102 cause a compiler warning, thereby making other checks fail, and
15103 needlessly disabling compiler-hardening support. Fixes one case of
15104 bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
15105 - Repair hardened builds under the clang compiler. Previously, our
15106 use of _FORTIFY_SOURCE would conflict with clang's address
15107 sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
15109 o Major bugfixes (security, pointers):
15110 - Avoid a difficult-to-trigger heap corruption attack when extending
15111 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
15112 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
15113 Reported by Guido Vranken.
15115 o Major bugfixes (testing):
15116 - Fix a bug that would block 'make test-network-all' on systems where
15117 IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
15119 o Major bugfixes (user interface):
15120 - Correctly give a warning in the cases where a relay is specified
15121 by nickname, and one such relay is found, but it is not officially
15122 Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
15124 o Minor features (accounting):
15125 - Added two modes to the AccountingRule option: One for limiting
15126 only the number of bytes sent ("AccountingRule out"), and one for
15127 limiting only the number of bytes received ("AccountingRule in").
15128 Closes ticket 15989; patch from "unixninja92".
15130 o Minor features (bug-resistance):
15131 - Make Tor survive errors involving connections without a
15132 corresponding event object. Previously we'd fail with an
15133 assertion; now we produce a log message. Related to bug 16248.
15134 - Use tor_snprintf() and tor_vsnprintf() even in external and low-
15135 level code, to harden against accidental failures to NUL-
15136 terminate. Part of ticket 17852. Patch from jsturgix. Found
15139 o Minor features (build):
15140 - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
15141 as having possible IPFW support. Closes ticket 18448. Patch from
15142 Steven Chamberlain.
15143 - Since our build process now uses "make distcheck", we no longer
15144 force "make dist" to depend on "make check". Closes ticket 17893;
15145 patch from "cypherpunks".
15146 - Tor now builds once again with the recent OpenSSL 1.1 development
15147 branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
15148 tracking OpenSSL 1.1 development as it has progressed, and fixing
15149 numerous compatibility issues as they arose. See tickets
15150 17549, 17921, 17984, 19499, and 18286.
15151 - When building manual pages, set the timezone to "UTC", so that the
15152 output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
15153 Patch from intrigeri.
15155 o Minor features (clients):
15156 - Make clients, onion services, and bridge relays always use an
15157 encrypted begindir connection for directory requests. Resolves
15158 ticket 18483. Patch by teor.
15160 o Minor features (controller):
15161 - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
15162 controllers can examine the the reject rules added by
15163 ExitPolicyRejectPrivate. This makes it easier for stem to display
15165 - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
15166 tickets 16774 and 17817. Patch by George Tankersley.
15167 - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
15168 service descriptor from a service's local hidden service
15169 descriptor cache. Closes ticket 14846.
15171 o Minor features (crypto):
15172 - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
15173 - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
15175 - Improve performance when hashing non-multiple of 8 sized buffers,
15176 based on Andrew Moon's public domain SipHash-2-4 implementation.
15177 Fixes bug 17544; bugfix on 0.2.5.3-alpha.
15178 - Validate the hard-coded Diffie-Hellman parameters and ensure that
15179 p is a safe prime, and g is a suitable generator. Closes
15181 - When allocating a digest state object, allocate no more space than
15182 we actually need. Previously, we would allocate as much space as
15183 the state for the largest algorithm would need. This change saves
15184 up to 672 bytes per circuit. Closes ticket 17796.
15186 o Minor features (directory downloads):
15187 - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
15188 directory mirrors. The default is 1; set it to 0 to disable
15189 fallbacks. Implements ticket 17576. Patch by teor.
15190 - Wait for busy authorities and fallback directories to become non-
15191 busy when bootstrapping. (A similar change was made in 6c443e987d
15192 for directory caches chosen from the consensus.) Closes ticket
15193 17864; patch by teor.
15195 o Minor features (geoip):
15196 - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
15199 o Minor features (hidden service directory):
15200 - Streamline relay-side hsdir handling: when relays consider whether
15201 to accept an uploaded hidden service descriptor, they no longer
15202 check whether they are one of the relays in the network that is
15203 "supposed" to handle that descriptor. Implements ticket 18332.
15205 o Minor features (IPv6):
15206 - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
15207 to 1, tor prefers IPv6 directory addresses.
15208 - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
15209 avoids using IPv4 for client OR and directory connections.
15210 - Add address policy assume_action support for IPv6 addresses.
15211 - Add an argument 'ipv6=address:orport' to the DirAuthority and
15212 FallbackDir torrc options, to specify an IPv6 address for an
15213 authority or fallback directory. Add hard-coded ipv6 addresses for
15214 directory authorities that have them. Closes ticket 17327; patch
15215 from Nick Mathewson and teor.
15216 - Allow users to configure directory authorities and fallback
15217 directory servers with IPv6 addresses and ORPorts. Resolves
15219 - Limit IPv6 mask bits to 128.
15220 - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
15221 17638; bugfix on 0.0.2pre8. Patch by teor.
15222 - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
15223 "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
15224 "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
15225 - Warn when comparing against an AF_UNSPEC address in a policy, it's
15226 almost always a bug. Closes ticket 17863; patch by teor.
15227 - routerset_parse now accepts IPv6 literal addresses. Fixes bug
15228 17060; bugfix on 0.2.1.3-alpha. Patch by teor.
15230 o Minor features (Linux seccomp2 sandbox):
15231 - Reject attempts to change our Address with "Sandbox 1" enabled.
15232 Changing Address with Sandbox turned on would never actually work,
15233 but previously it would fail in strange and confusing ways. Found
15234 while fixing 18548.
15236 o Minor features (logging):
15237 - When logging to syslog, allow a tag to be added to the syslog
15238 identity (the string prepended to every log message). The tag can
15239 be configured with SyslogIdentityTag and defaults to none. Setting
15240 it to "foo" will cause logs to be tagged as "Tor-foo". Closes
15243 o Minor features (portability):
15244 - Use timingsafe_memcmp() where available. Closes ticket 17944;
15245 patch from <logan@hackers.mu>.
15247 o Minor features (relay, address discovery):
15248 - Add a family argument to get_interface_addresses_raw() and
15249 subfunctions to make network interface address interogation more
15250 efficient. Now Tor can specifically ask for IPv4, IPv6 or both
15251 types of interfaces from the operating system. Resolves
15253 - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
15254 fails to enumerate interface addresses using the platform-specific
15255 API, have it rely on the UDP socket fallback technique to try and
15256 find out what IP addresses (both IPv4 and IPv6) our machine has.
15257 Resolves ticket 17951.
15259 o Minor features (replay cache):
15260 - The replay cache now uses SHA256 instead of SHA1. Implements
15261 feature 8961. Patch by teor, issue reported by rransom.
15263 o Minor features (robustness):
15264 - Exit immediately with an error message if the code attempts to use
15265 Libevent without having initialized it. This should resolve some
15266 frequently-made mistakes in our unit tests. Closes ticket 18241.
15268 o Minor features (security, clock):
15269 - Warn when the system clock appears to move back in time (when the
15270 state file was last written in the future). Tor doesn't know that
15271 consensuses have expired if the clock is in the past. Patch by
15272 teor. Implements ticket 17188.
15274 o Minor features (security, exit policies):
15275 - ExitPolicyRejectPrivate now rejects more private addresses by
15276 default. Specifically, it now rejects the relay's outbound bind
15277 addresses (if configured), and the relay's configured port
15278 addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
15279 0.2.0.11-alpha. Patch by teor.
15281 o Minor features (security, memory erasure):
15282 - Make memwipe() do nothing when passed a NULL pointer or buffer of
15283 zero size. Check size argument to memwipe() for underflow. Fixes
15284 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
15286 - Set the unused entries in a smartlist to NULL. This helped catch
15287 a (harmless) bug, and shouldn't affect performance too much.
15288 Implements ticket 17026.
15289 - Use SecureMemoryWipe() function to securely clean memory on
15290 Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
15291 Implements feature 17986.
15292 - Use explicit_bzero or memset_s when present. Previously, we'd use
15293 OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
15294 from <logan@hackers.mu> and <selven@hackers.mu>.
15296 o Minor features (security, RNG):
15297 - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
15298 positively are not allowed to fail. Previously we depended on
15299 internal details of OpenSSL's behavior. Closes ticket 17686.
15300 - Never use the system entropy output directly for anything besides
15301 seeding the PRNG. When we want to generate important keys, instead
15302 of using system entropy directly, we now hash it with the PRNG
15303 stream. This may help resist certain attacks based on broken OS
15304 entropy implementations. Closes part of ticket 17694.
15305 - Use modern system calls (like getentropy() or getrandom()) to
15306 generate strong entropy on platforms that have them. Closes
15309 o Minor features (security, win32):
15310 - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
15311 attack. Fixes bug 18123; bugfix on all tor versions. Patch
15314 o Minor features (unix domain sockets):
15315 - Add a new per-socket option, RelaxDirModeCheck, to allow creating
15316 Unix domain sockets without checking the permissions on the parent
15317 directory. (Tor checks permissions by default because some
15318 operating systems only check permissions on the parent directory.
15319 However, some operating systems do look at permissions on the
15320 socket, and tor's default check is unneeded.) Closes ticket 18458.
15323 o Minor features (unix file permissions):
15324 - Defer creation of Unix sockets until after setuid. This avoids
15325 needing CAP_CHOWN and CAP_FOWNER when using systemd's
15326 CapabilityBoundingSet, or chown and fowner when using SELinux.
15327 Implements part of ticket 17562. Patch from Jamie Nguyen.
15328 - If any directory created by Tor is marked as group readable, the
15329 filesystem group is allowed to be either the default GID or the
15330 root user. Allowing root to read the DataDirectory prevents the
15331 need for CAP_READ_SEARCH when using systemd's
15332 CapabilityBoundingSet, or dac_read_search when using SELinux.
15333 Implements part of ticket 17562. Patch from Jamie Nguyen.
15334 - Introduce a new DataDirectoryGroupReadable option. If it is set to
15335 1, the DataDirectory will be made readable by the default GID.
15336 Implements part of ticket 17562. Patch from Jamie Nguyen.
15338 o Minor bugfixes (accounting):
15339 - The max bandwidth when using 'AccountRule sum' is now correctly
15340 logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
15341 from "unixninja92".
15343 o Minor bugfixes (assert, portability):
15344 - Fix an assertion failure in memarea.c on systems where "long" is
15345 shorter than the size of a pointer. Fixes bug 18716; bugfix
15348 o Minor bugfixes (bootstrap):
15349 - Consistently use the consensus download schedule for authority
15350 certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
15352 o Minor bugfixes (build):
15353 - Avoid spurious failures from configure files related to calling
15354 exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
15355 0.2.0.1-alpha. Patch from "cypherpunks".
15356 - Do not link the unit tests against both the testing and non-
15357 testing versions of the static libraries. Fixes bug 18490; bugfix
15359 - Resolve warnings when building on systems that are concerned with
15360 signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
15362 - Silence spurious clang-scan warnings in the ed25519_donna code by
15363 explicitly initializing some objects. Fixes bug 18384; bugfix on
15364 0.2.7.2-alpha. Patch by teor.
15365 - When libscrypt.h is found, but no libscrypt library can be linked,
15366 treat libscrypt as absent. Fixes bug 19161; bugfix
15368 - Cause the unit tests to compile correctly on mingw64 versions that
15369 lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
15370 - Don't try to use the pthread_condattr_setclock() function unless
15371 it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
15372 17819; bugfix on 0.2.6.3-alpha.
15373 - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
15375 - Fix search for libevent libraries on OpenBSD (and other systems
15376 that install libevent 1 and libevent 2 in parallel). Fixes bug
15377 16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
15378 - Isolate environment variables meant for tests from the rest of the
15379 build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
15380 - Mark all object files that include micro-revision.i as depending
15381 on it, so as to make parallel builds more reliable. Fixes bug
15382 17826; bugfix on 0.2.5.1-alpha.
15383 - Remove config.log only from make distclean, not from make clean.
15384 Fixes bug 17924; bugfix on 0.2.4.1-alpha.
15385 - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
15387 - Remove an #endif from configure.ac so that we correctly detect the
15388 presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
15391 o Minor bugfixes (client, bootstrap):
15392 - Count receipt of new microdescriptors as progress towards
15393 bootstrapping. Previously, with EntryNodes set, Tor might not
15394 successfully repopulate the guard set on bootstrapping. Fixes bug
15395 16825; bugfix on 0.2.3.1-alpha.
15397 o Minor bugfixes (code correctness):
15398 - Fix a bad memory handling bug that would occur if we had queued a
15399 cell on a channel's incoming queue. Fortunately, we can't actually
15400 queue a cell like that as our code is constructed today, but it's
15401 best to avoid this kind of error, even if there isn't any code
15402 that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
15403 - Assert that allocated memory held by the reputation code is freed
15404 according to its internal counters. Fixes bug 17753; bugfix
15406 - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
15408 - Update to the latest version of Trunnel, which tries harder to
15409 avoid generating code that can invoke memcpy(p,NULL,0). Bug found
15410 by clang address sanitizer. Fixes bug 18373; bugfix
15412 - When closing an entry connection, generate a warning if we should
15413 have sent an end cell for it but we haven't. Fixes bug 17876;
15414 bugfix on 0.2.3.2-alpha.
15416 o Minor bugfixes (configuration):
15417 - Fix a tiny memory leak when parsing a port configuration ending in
15418 ":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
15420 o Minor bugfixes (containers):
15421 - If we somehow attempt to construct a heap with more than
15422 1073741822 elements, avoid an integer overflow when maintaining
15423 the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
15425 o Minor bugfixes (controller, microdescriptors):
15426 - Make GETINFO dir/status-vote/current/consensus conform to the
15427 control specification by returning "551 Could not open cached
15428 consensus..." when not caching consensuses. Fixes bug 18920;
15429 bugfix on 0.2.2.6-alpha.
15431 o Minor bugfixes (crypto):
15432 - Check the return value of HMAC() and assert on failure. Fixes bug
15433 17658; bugfix on 0.2.3.6-alpha. Patch by teor.
15435 o Minor bugfixes (directories):
15436 - When fetching extrainfo documents, compare their SHA256 digests
15437 and Ed25519 signing key certificates with the routerinfo that led
15438 us to fetch them, rather than with the most recent routerinfo.
15439 Otherwise we generate many spurious warnings about mismatches.
15440 Fixes bug 17150; bugfix on 0.2.7.2-alpha.
15441 - When generating a URL for a directory server on an IPv6 address,
15442 wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
15443 on 0.2.3.9-alpha. Patch from Malek.
15445 o Minor bugfixes (downloading):
15446 - Predict more correctly whether we'll be downloading over HTTP when
15447 we determine the maximum length of a URL. This should avoid a
15448 "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
15451 o Minor bugfixes (exit policies, security):
15452 - Refresh an exit relay's exit policy when interface addresses
15453 change. Previously, tor only refreshed the exit policy when the
15454 configured external address changed. Fixes bug 18208; bugfix on
15455 0.2.7.3-rc. Patch by teor.
15457 o Minor bugfixes (fallback directories):
15458 - Mark fallbacks as "too busy" when they return a 503 response,
15459 rather than just marking authorities. Fixes bug 17572; bugfix on
15460 0.2.4.7-alpha. Patch by teor.
15461 - When requesting extrainfo descriptors from a trusted directory
15462 server, check whether it is an authority or a fallback directory
15463 which supports extrainfo descriptors. Fixes bug 18489; bugfix on
15464 0.2.4.7-alpha. Reported by atagar, patch by teor.
15466 o Minor bugfixes (hidden service, client):
15467 - Handle the case where the user makes several fast consecutive
15468 requests to the same .onion address. Previously, the first six
15469 requests would each trigger a descriptor fetch, each picking a
15470 directory (there are 6 overall) and the seventh one would fail
15471 because no directories were left, thereby triggering a close on
15472 all current directory connections asking for the hidden service.
15473 The solution here is to not close the connections if we have
15474 pending directory fetches. Fixes bug 15937; bugfix
15477 o Minor bugfixes (hidden service, control port):
15478 - Add the onion address to the HS_DESC event for the UPLOADED action
15479 both on success or failure. It was previously hardcoded with
15480 UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
15482 o Minor bugfixes (hidden service, directory):
15483 - Bridges now refuse "rendezvous2" (hidden service descriptor)
15484 publish attempts. Suggested by ticket 18332.
15486 o Minor bugfixes (IPv6):
15487 - Update the limits in max_dl_per_request for IPv6 address length.
15488 Fixes bug 17573; bugfix on 0.2.1.5-alpha.
15490 o Minor bugfixes (Linux seccomp2 sandbox):
15491 - Allow more syscalls when running with "Sandbox 1" enabled:
15492 sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
15493 some systems, these are required for Tor to start. Fixes bug
15494 18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
15495 - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
15496 so that get_interface_address6_via_udp_socket_hack() can work.
15497 Fixes bug 19660; bugfix on 0.2.5.1-alpha.
15498 - Allow the setrlimit syscall, and the prlimit and prlimit64
15499 syscalls, which some libc implementations use under the hood.
15500 Fixes bug 15221; bugfix on 0.2.5.1-alpha.
15501 - Avoid a 10-second delay when starting as a client with "Sandbox 1"
15502 enabled and no DNS resolvers configured. This should help TAILS
15503 start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
15504 - Fix a crash when using offline master ed25519 keys with the Linux
15505 seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
15506 - Allow statistics to be written to disk when "Sandbox 1" is
15507 enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
15508 0.2.6.1-alpha respectively.
15510 o Minor bugfixes (logging):
15511 - In log messages that include a function name, use __FUNCTION__
15512 instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
15513 with clang __PRETTY_FUNCTION__ has extra information we don't
15514 need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
15516 - Remove needless quotes from a log message about unparseable
15517 addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
15518 - Scrub service name in "unrecognized service ID" log messages.
15519 Fixes bug 18600; bugfix on 0.2.4.11-alpha.
15520 - When logging information about an unparsable networkstatus vote or
15521 consensus, do not say "vote" when we mean consensus. Fixes bug
15522 18368; bugfix on 0.2.0.8-alpha.
15523 - When we can't generate a signing key because OfflineMasterKey is
15524 set, do not imply that we should have been able to load it. Fixes
15525 bug 18133; bugfix on 0.2.7.2-alpha.
15526 - When logging a malformed hostname received through socks4, scrub
15527 it if SafeLogging says we should. Fixes bug 17419; bugfix
15530 o Minor bugfixes (memory safety):
15531 - Avoid freeing an uninitialized pointer when opening a socket fails
15532 in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
15533 0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
15535 - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
15536 18672; bugfix on 0.2.5.1-alpha.
15537 - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
15540 o Minor bugfixes (pluggable transports):
15541 - Avoid reporting a spurious error when we decide that we don't need
15542 to terminate a pluggable transport because it has already exited.
15543 Fixes bug 18686; bugfix on 0.2.5.5-alpha.
15545 o Minor bugfixes (pointer arithmetic):
15546 - Fix a bug in memarea_alloc() that could have resulted in remote
15547 heap write access, if Tor had ever passed an unchecked size to
15548 memarea_alloc(). Fortunately, all the sizes we pass to
15549 memarea_alloc() are pre-checked to be less than 128 kilobytes.
15550 Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
15553 o Minor bugfixes (private directory):
15554 - Prevent a race condition when creating private directories. Fixes
15555 part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
15556 Patch from jsturgix. Found with Flawfinder.
15558 o Minor bugfixes (relays):
15559 - Check that both the ORPort and DirPort (if present) are reachable
15560 before publishing a relay descriptor. Otherwise, relays publish a
15561 descriptor with DirPort 0 when the DirPort reachability test takes
15562 longer than the ORPort reachability test. Fixes bug 18050; bugfix
15563 on 0.1.0.1-rc. Reported by "starlight", patch by teor.
15564 - Resolve some edge cases where we might launch an ORPort
15565 reachability check even when DisableNetwork is set. Noticed while
15566 fixing bug 18616; bugfix on 0.2.3.9-alpha.
15568 o Minor bugfixes (relays, hidden services):
15569 - Refuse connection requests to private OR addresses unless
15570 ExtendAllowPrivateAddresses is set. Previously, tor would connect,
15571 then refuse to send any cells to a private address. Fixes bugs
15572 17674 and 8976; bugfix on 0.2.3.21-rc. Patch by teor.
15574 o Minor bugfixes (security, hidden services):
15575 - Prevent hidden services connecting to client-supplied rendezvous
15576 addresses that are reserved as internal or multicast. Fixes bug
15577 8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
15579 o Minor bugfixes (statistics):
15580 - Consistently check for overflow in round_*_to_next_multiple_of
15581 functions, and add unit tests with additional and maximal values.
15582 Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
15583 - Handle edge cases in the laplace functions: avoid division by
15584 zero, avoid taking the log of zero, and silence clang type
15585 conversion warnings using round and trunc. Add unit tests for edge
15586 cases with maximal values. Fixes part of bug 13192; bugfix
15588 - We now include consensus downloads via IPv6 in our directory-
15589 request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
15591 o Minor bugfixes (test networks, IPv6):
15592 - Allow internal IPv6 addresses in descriptors in test networks.
15593 Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
15596 o Minor bugfixes (testing):
15597 - Check the full results of SHA256 and SHA512 digests in the unit
15598 tests. Bugfix on 0.2.2.4-alpha. Patch by teor.
15599 - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
15601 - Fix a small memory leak that would occur when the
15602 TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
15603 bugfix on 0.2.5.2-alpha.
15604 - Make unit tests pass on IPv6-only systems, and systems without
15605 localhost addresses (like some FreeBSD jails). Fixes bug 17632;
15606 bugfix on 0.2.7.3-rc. Patch by teor.
15607 - The test for log_heartbeat was incorrectly failing in timezones
15608 with non-integer offsets. Instead of comparing the end of the time
15609 string against a constant, compare it to the output of
15610 format_local_iso_time when given the correct input. Fixes bug
15611 18039; bugfix on 0.2.5.4-alpha.
15612 - We no longer disable assertions in the unit tests when coverage is
15613 enabled. Instead, we require you to say --disable-asserts-in-tests
15614 to the configure script if you need assertions disabled in the
15615 unit tests (for example, if you want to perform branch coverage).
15616 Fixes bug 18242; bugfix on 0.2.7.1-alpha.
15618 o Minor bugfixes (time handling):
15619 - When correcting a corrupt 'struct tm' value, fill in the tm_wday
15620 field. Otherwise, our unit tests crash on Windows. Fixes bug
15621 18977; bugfix on 0.2.2.25-alpha.
15622 - Avoid overflow in tor_timegm when parsing dates in and after 2038
15623 on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
15624 0.0.2pre14. Patch by teor.
15626 o Minor bugfixes (tor-gencert):
15627 - Correctly handle the case where an authority operator enters a
15628 passphrase but sends an EOF before sending a newline. Fixes bug
15629 17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
15631 o Code simplification and refactoring:
15632 - Clean up a little duplicated code in
15633 crypto_expand_key_material_TAP(). Closes ticket 17587; patch
15635 - Decouple the list of streams waiting to be attached to circuits
15636 from the overall connection list. This change makes it possible to
15637 attach streams quickly while simplifying Tor's callgraph and
15638 avoiding O(N) scans of the entire connection list. Closes
15640 - Extract the more complicated parts of circuit_mark_for_close()
15641 into a new function that we run periodically before circuits are
15642 freed. This change removes more than half of the functions
15643 currently in the "blob". Closes ticket 17218.
15644 - Move logging of redundant policy entries in
15645 policies_parse_exit_policy_internal into its own function. Closes
15646 ticket 17608; patch from "juce".
15647 - Quote all the string interpolations in configure.ac -- even those
15648 which we are pretty sure can't contain spaces. Closes ticket
15649 17744. Patch from zerosion.
15650 - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
15651 use them. Closes ticket 17926.
15652 - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
15653 inplace, so there's no need to have a separate implementation for
15654 the non-inplace code. Closes ticket 18258. Patch from Malek.
15655 - Simplify return types for some crypto functions that can't
15656 actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
15657 - When a direct directory request fails immediately on launch,
15658 instead of relaunching that request from inside the code that
15659 launches it, instead mark the connection for teardown. This change
15660 simplifies Tor's callback and prevents the directory-request
15661 launching code from invoking itself recursively. Closes
15665 - Add a description of the correct use of the '--keygen' command-
15666 line option. Closes ticket 17583; based on text by 's7r'.
15667 - Change build messages to refer to "Fedora" instead of "Fedora
15668 Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
15669 Patches from "icanhasaccount" and "cypherpunks".
15670 - Document the contents of the 'datadir/keys' subdirectory in the
15671 manual page. Closes ticket 17621.
15672 - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
15673 - Explain actual minima for BandwidthRate. Closes ticket 16382.
15674 - Fix a minor formatting typo in the manpage. Closes ticket 17791.
15675 - Mention torspec URL in the manpage and point the reader to it
15676 whenever we mention a document that belongs in torspce. Fixes
15678 - Stop recommending use of nicknames to identify relays in our
15679 MapAddress documentation. Closes ticket 18312.
15681 o Removed features:
15682 - Remove client-side support for connecting to Tor relays running
15683 versions of Tor before 0.2.3.6-alpha. These relays didn't support
15684 the v3 TLS handshake protocol, and are no longer allowed on the
15685 Tor network. Implements the client side of ticket 11150. Based on
15686 patches by Tom van der Woerdt.
15687 - We no longer maintain an internal freelist in memarea.c.
15688 Allocators should be good enough to make this code unnecessary,
15689 and it's doubtful that it ever had any performance benefit.
15692 - Add unit tests to check for common RNG failure modes, such as
15693 returning all zeroes, identical values, or incrementing values
15694 (OpenSSL's rand_predictable feature). Patch by teor.
15695 - Always test both ed25519 backends, so that we can be sure that our
15696 batch-open replacement code works. Part of ticket 16794.
15697 - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
15698 portion of ticket 16831.
15699 - Fix several warnings from clang's address sanitizer produced in
15701 - Log more information when the backtrace tests fail. Closes ticket
15702 17892. Patch from "cypherpunks."
15703 - More unit tests for compat_libevent.c, procmon.c, tortls.c,
15704 util_format.c, directory.c, and options_validate.c. Closes tickets
15705 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
15707 - Treat backtrace test failures as expected on FreeBSD until we
15708 solve bug 17808. Closes ticket 18204.
15709 - Unit tests for directory_handle_command_get. Closes ticket 17004.
15710 Patch from Reinaldo de Souza Jr.
15713 Changes in version 0.2.7.6 - 2015-12-10
15714 Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
15715 well as a minor bug in hidden service reliability.
15717 o Major bugfixes (guard selection):
15718 - Actually look at the Guard flag when selecting a new directory
15719 guard. When we implemented the directory guard design, we
15720 accidentally started treating all relays as if they have the Guard
15721 flag during guard selection, leading to weaker anonymity and worse
15722 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
15725 o Minor features (geoip):
15726 - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
15729 o Minor bugfixes (compilation):
15730 - When checking for net/pfvar.h, include netinet/in.h if possible.
15731 This fixes transparent proxy detection on OpenBSD. Fixes bug
15732 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
15733 - Fix a compilation warning with Clang 3.6: Do not check the
15734 presence of an address which can never be NULL. Fixes bug 17781.
15736 o Minor bugfixes (correctness):
15737 - When displaying an IPv6 exit policy, include the mask bits
15738 correctly even when the number is greater than 31. Fixes bug
15739 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
15740 - The wrong list was used when looking up expired intro points in a
15741 rend service object, causing what we think could be reachability
15742 issues for hidden services, and triggering a BUG log. Fixes bug
15743 16702; bugfix on 0.2.7.2-alpha.
15744 - Fix undefined behavior in the tor_cert_checksig function. Fixes
15745 bug 17722; bugfix on 0.2.7.2-alpha.
15748 Changes in version 0.2.7.5 - 2015-11-20
15749 The Tor 0.2.7 release series is dedicated to the memory of Tor user
15750 and privacy advocate Caspar Bowden (1961-2015). Caspar worked
15751 tirelessly to advocate human rights regardless of national borders,
15752 and oppose the encroachments of mass surveillance. He opposed national
15753 exceptionalism, he brought clarity to legal and policy debates, he
15754 understood and predicted the impact of mass surveillance on the world,
15755 and he laid the groundwork for resisting it. While serving on the Tor
15756 Project's board of directors, he brought us his uncompromising focus
15757 on technical excellence in the service of humankind. Caspar was an
15758 inimitable force for good and a wonderful friend. He was kind,
15759 humorous, generous, gallant, and believed we should protect one
15760 another without exception. We honor him here for his ideals, his
15761 efforts, and his accomplishments. Please honor his memory with works
15762 that would make him proud.
15764 Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
15766 The 0.2.7 series adds a more secure identity key type for relays,
15767 improves cryptography performance, resolves several longstanding
15768 hidden-service performance issues, improves controller support for
15769 hidden services, and includes small bugfixes and performance
15770 improvements throughout the program. This release series also includes
15771 more tests than before, and significant simplifications to which parts
15772 of Tor invoke which others. For a full list of changes, see below.
15774 o New system requirements:
15775 - Tor no longer includes workarounds to support Libevent versions
15776 before 1.3e. Libevent 2.0 or later is recommended. Closes
15778 - Tor no longer supports copies of OpenSSL that are missing support
15779 for Elliptic Curve Cryptography. (We began using ECC when
15780 available in 0.2.4.8-alpha, for more safe and efficient key
15781 negotiation.) In particular, support for at least one of P256 or
15782 P224 is now required, with manual configuration needed if only
15783 P224 is available. Resolves ticket 16140.
15784 - Tor no longer supports versions of OpenSSL before 1.0. (If you are
15785 on an operating system that has not upgraded to OpenSSL 1.0 or
15786 later, and you compile Tor from source, you will need to install a
15787 more recent OpenSSL to link Tor against.) These versions of
15788 OpenSSL are still supported by the OpenSSL, but the numerous
15789 cryptographic improvements in later OpenSSL releases makes them a
15790 clear choice. Resolves ticket 16034.
15792 o Major features (controller):
15793 - Add the ADD_ONION and DEL_ONION commands that allow the creation
15794 and management of hidden services via the controller. Closes
15796 - New "GETINFO onions/current" and "GETINFO onions/detached"
15797 commands to get information about hidden services created via the
15798 controller. Part of ticket 6411.
15799 - New HSFETCH command to launch a request for a hidden service
15800 descriptor. Closes ticket 14847.
15801 - New HSPOST command to upload a hidden service descriptor. Closes
15802 ticket 3523. Patch by "DonnchaC".
15804 o Major features (Ed25519 identity keys, Proposal 220):
15805 - Add support for offline encrypted Ed25519 master keys. To use this
15806 feature on your tor relay, run "tor --keygen" to make a new master
15807 key (or to make a new signing key if you already have a master
15808 key). Closes ticket 13642.
15809 - All relays now maintain a stronger identity key, using the Ed25519
15810 elliptic curve signature format. This master key is designed so
15811 that it can be kept offline. Relays also generate an online
15812 signing key, and a set of other Ed25519 keys and certificates.
15813 These are all automatically regenerated and rotated as needed.
15814 Implements part of ticket 12498.
15815 - Directory authorities now vote on Ed25519 identity keys along with
15816 RSA1024 keys. Implements part of ticket 12498.
15817 - Directory authorities track which Ed25519 identity keys have been
15818 used with which RSA1024 identity keys, and do not allow them to
15819 vary freely. Implements part of ticket 12498.
15820 - Microdescriptors now include Ed25519 identity keys. Implements
15821 part of ticket 12498.
15822 - Add a --newpass option to allow changing or removing the
15823 passphrase of an encrypted key with tor --keygen. Implements part
15825 - Add a new OfflineMasterKey option to tell Tor never to try loading
15826 or generating a secret Ed25519 identity key. You can use this in
15827 combination with tor --keygen to manage offline and/or encrypted
15828 Ed25519 keys. Implements ticket 16944.
15829 - On receiving a HUP signal, check to see whether the Ed25519
15830 signing key has changed, and reload it if so. Closes ticket 16790.
15831 - Significant usability improvements for Ed25519 key management. Log
15832 messages are better, and the code can recover from far more
15833 failure conditions. Thanks to "s7r" for reporting and diagnosing
15836 o Major features (ECC performance):
15837 - Improve the runtime speed of Ed25519 signature verification by
15838 using Ed25519-donna's batch verification support. Implements
15840 - Improve the speed of Ed25519 operations and Curve25519 keypair
15841 generation when built targeting 32 bit x86 platforms with SSE2
15842 available. Implements ticket 16535.
15843 - Improve the runtime speed of Ed25519 operations by using the
15844 public-domain Ed25519-donna by Andrew M. ("floodyberry").
15845 Implements ticket 16467.
15846 - Improve the runtime speed of the ntor handshake by using an
15847 optimized curve25519 basepoint scalarmult implementation from the
15848 public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
15849 ideas by Adam Langley. Implements ticket 9663.
15851 o Major features (Hidden services):
15852 - Hidden services, if using the EntryNodes option, are required to
15853 use more than one EntryNode, in order to avoid a guard discovery
15854 attack. (This would only affect people who had configured hidden
15855 services and manually specified the EntryNodes option with a
15856 single entry-node. The impact was that it would be easy to
15857 remotely identify the guard node used by such a hidden service.
15858 See ticket for more information.) Fixes ticket 14917.
15859 - Add the torrc option HiddenServiceNumIntroductionPoints, to
15860 specify a fixed number of introduction points. Its maximum value
15861 is 10 and default is 3. Using this option can increase a hidden
15862 service's reliability under load, at the cost of making it more
15863 visible that the hidden service is facing extra load. Closes
15865 - Remove the adaptive algorithm for choosing the number of
15866 introduction points, which used to change the number of
15867 introduction points (poorly) depending on the number of
15868 connections the HS sees. Closes ticket 4862.
15870 o Major features (onion key cross-certification):
15871 - Relay descriptors now include signatures of their own identity
15872 keys, made using the TAP and ntor onion keys. These signatures
15873 allow relays to prove ownership of their own onion keys. Because
15874 of this change, microdescriptors will no longer need to include
15875 RSA identity keys. Implements proposal 228; closes ticket 12499.
15877 o Major bugfixes (client-side privacy, also in 0.2.6.9):
15878 - Properly separate out each SOCKSPort when applying stream
15879 isolation. The error occurred because each port's session group
15880 was being overwritten by a default value when the listener
15881 connection was initialized. Fixes bug 16247; bugfix on
15882 0.2.6.3-alpha. Patch by "jojelino".
15884 o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
15885 - Stop refusing to store updated hidden service descriptors on a
15886 client. This reverts commit 9407040c59218 (which indeed fixed bug
15887 14219, but introduced a major hidden service reachability
15888 regression detailed in bug 16381). This is a temporary fix since
15889 we can live with the minor issue in bug 14219 (it just results in
15890 some load on the network) but the regression of 16381 is too much
15891 of a setback. First-round fix for bug 16381; bugfix
15894 o Major bugfixes (hidden services):
15895 - Revert commit that made directory authorities assign the HSDir
15896 flag to relays without a DirPort; this was bad because such relays
15897 can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
15899 - When cannibalizing a circuit for an introduction point, always
15900 extend to the chosen exit node (creating a 4 hop circuit).
15901 Previously Tor would use the current circuit exit node, which
15902 changed the original choice of introduction point, and could cause
15903 the hidden service to skip excluded introduction points or
15904 reconnect to a skipped introduction point. Fixes bug 16260; bugfix
15907 o Major bugfixes (memory leaks):
15908 - Fix a memory leak in ed25519 batch signature checking. Fixes bug
15909 17398; bugfix on 0.2.6.1-alpha.
15911 o Major bugfixes (open file limit):
15912 - The open file limit wasn't checked before calling
15913 tor_accept_socket_nonblocking(), which would make Tor exceed the
15914 limit. Now, before opening a new socket, Tor validates the open
15915 file limit just before, and if the max has been reached, return an
15916 error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
15918 o Major bugfixes (security, correctness):
15919 - Fix an error that could cause us to read 4 bytes before the
15920 beginning of an openssl string. This bug could be used to cause
15921 Tor to crash on systems with unusual malloc implementations, or
15922 systems with unusual hardening installed. Fixes bug 17404; bugfix
15925 o Major bugfixes (stability, also in 0.2.6.10):
15926 - Stop crashing with an assertion failure when parsing certain kinds
15927 of malformed or truncated microdescriptors. Fixes bug 16400;
15928 bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
15929 by "cypherpunks_backup".
15930 - Stop random client-side assertion failures that could occur when
15931 connecting to a busy hidden service, or connecting to a hidden
15932 service while a NEWNYM is in progress. Fixes bug 16013; bugfix
15935 o Minor features (client, SOCKS):
15936 - Add GroupWritable and WorldWritable options to unix-socket based
15937 SocksPort and ControlPort options. These options apply to a single
15938 socket, and override {Control,Socks}SocketsGroupWritable. Closes
15940 - Relax the validation done to hostnames in SOCKS5 requests, and
15941 allow a single trailing '.' to cope with clients that pass FQDNs
15942 using that syntax to explicitly indicate that the domain name is
15943 fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
15944 - Relax the validation of hostnames in SOCKS5 requests, allowing the
15945 character '_' to appear, in order to cope with domains observed in
15946 the wild that are serving non-RFC compliant records. Resolves
15949 o Minor features (client-side privacy):
15950 - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
15951 lifespan when IsolateSOCKSAuth and streams with SOCKS
15952 authentication are attached to the circuit. This allows
15953 applications like TorBrowser to manage circuit lifetime on their
15954 own. Implements feature 15482.
15955 - When logging malformed hostnames from SOCKS5 requests, respect
15956 SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
15958 o Minor features (clock-jump tolerance):
15959 - Recover better when our clock jumps back many hours, like might
15960 happen for Tails or Whonix users who start with a very wrong
15961 hardware clock, use Tor to discover a more accurate time, and then
15962 fix their clock. Resolves part of ticket 8766.
15964 o Minor features (command-line interface):
15965 - Make --hash-password imply --hush to prevent unnecessary noise.
15966 Closes ticket 15542. Patch from "cypherpunks".
15967 - Print a warning whenever we find a relative file path being used
15968 as torrc option. Resolves issue 14018.
15970 o Minor features (compilation):
15971 - Give a warning as early as possible when trying to build with an
15972 unsupported OpenSSL version. Closes ticket 16901.
15973 - Use C99 variadic macros when the compiler is not GCC. This avoids
15974 failing compilations on MSVC, and fixes a log-file-based race
15975 condition in our old workarounds. Original patch from Gisle Vanem.
15977 o Minor features (control protocol):
15978 - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
15979 the control protocol. Resolves ticket 15358.
15981 o Minor features (controller):
15982 - Add DirAuthority lines for default directory authorities to the
15983 output of the "GETINFO config/defaults" command if not already
15984 present. Implements ticket 14840.
15985 - Controllers can now use "GETINFO hs/client/desc/id/..." to
15986 retrieve items from the client's hidden service descriptor cache.
15987 Closes ticket 14845.
15988 - Implement a new controller command "GETINFO status/fresh-relay-
15989 descs" to fetch a descriptor/extrainfo pair that was generated on
15990 demand just for the controller's use. Implements ticket 14784.
15992 o Minor features (directory authorities):
15993 - Directory authorities no longer vote against the "Fast", "Stable",
15994 and "HSDir" flags just because they were going to vote against
15995 "Running": if the consensus turns out to be that the router was
15996 running, then the authority's vote should count. Patch from Peter
15997 Retzlaff; closes issue 8712.
15999 o Minor features (directory authorities, security, also in 0.2.6.9):
16000 - The HSDir flag given by authorities now requires the Stable flag.
16001 For the current network, this results in going from 2887 to 2806
16002 HSDirs. Also, it makes it harder for an attacker to launch a sybil
16003 attack by raising the effort for a relay to become Stable to
16004 require at the very least 7 days, while maintaining the 96 hours
16005 uptime requirement for HSDir. Implements ticket 8243.
16007 o Minor features (DoS-resistance):
16008 - Make it harder for attackers to overload hidden services with
16009 introductions, by blocking multiple introduction requests on the
16010 same circuit. Resolves ticket 15515.
16012 o Minor features (geoip):
16013 - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
16016 o Minor features (hidden services):
16017 - Add the new options "HiddenServiceMaxStreams" and
16018 "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
16019 limit the maximum number of simultaneous streams per circuit, and
16020 optionally tear down the circuit when the limit is exceeded. Part
16022 - Client now uses an introduction point failure cache to know when
16023 to fetch or keep a descriptor in their cache. Previously, failures
16024 were recorded implicitly, but not explicitly remembered. Closes
16026 - Relays need to have the Fast flag to get the HSDir flag. As this
16027 is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
16028 drop. This change should make some attacks against the hidden
16029 service directory system harder. Fixes ticket 15963.
16030 - Turn on hidden service statistics collection by setting the torrc
16031 option HiddenServiceStatistics to "1" by default. (This keeps
16032 track only of the fraction of traffic used by hidden services, and
16033 the total number of hidden services in existence.) Closes
16035 - To avoid leaking HS popularity, don't cycle the introduction point
16036 when we've handled a fixed number of INTRODUCE2 cells but instead
16037 cycle it when a random number of introductions is reached, thus
16038 making it more difficult for an attacker to find out the amount of
16039 clients that have used the introduction point for a specific HS.
16040 Closes ticket 15745.
16042 o Minor features (logging):
16043 - Include the Tor version in all LD_BUG log messages, since people
16044 tend to cut and paste those into the bugtracker. Implements
16047 o Minor features (pluggable transports):
16048 - When launching managed pluggable transports on Linux systems,
16049 attempt to have the kernel deliver a SIGTERM on tor exit if the
16050 pluggable transport process is still running. Resolves
16052 - When launching managed pluggable transports, setup a valid open
16053 stdin in the child process that can be used to detect if tor has
16054 terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
16055 can be used by implementations to detect this new behavior.
16056 Resolves ticket 15435.
16058 o Minor bugfixes (torrc exit policies):
16059 - In each instance above, usage advice is provided to avoid the
16060 message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
16061 16069; bugfix on 0.2.4.7-alpha.
16062 - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
16063 produce IPv6 wildcard addresses. Previously they would produce
16064 both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
16065 of bug 16069; bugfix on 0.2.4.7-alpha.
16066 - When parsing torrc ExitPolicies, we now issue an info-level
16067 message when expanding an "accept/reject *" line to include both
16068 IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
16069 - When parsing torrc ExitPolicies, we now warn for a number of cases
16070 where the user's intent is likely to differ from Tor's actual
16071 behavior. These include: using an IPv4 address with an accept6 or
16072 reject6 line; using "private" on an accept6 or reject6 line; and
16073 including any ExitPolicy lines after accept *:* or reject *:*.
16074 Related to ticket 16069.
16076 o Minor bugfixes (command-line interface):
16077 - When "--quiet" is provided along with "--validate-config", do not
16078 write anything to stdout on success. Fixes bug 14994; bugfix
16080 - When complaining about bad arguments to "--dump-config", use
16081 stderr, not stdout.
16082 - Print usage information for --dump-config when it is used without
16083 an argument. Also, fix the error message to use different wording
16084 and add newline at the end. Fixes bug 15541; bugfix
16087 o Minor bugfixes (compilation):
16088 - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
16089 bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
16090 - Repair compilation with the most recent (unreleased, alpha)
16091 vesions of OpenSSL 1.1. Fixes part of ticket 17237.
16093 o Minor bugfixes (compilation, also in 0.2.6.9):
16094 - Build with --enable-systemd correctly when libsystemd is
16095 installed, but systemd is not. Fixes bug 16164; bugfix on
16096 0.2.6.3-alpha. Patch from Peter Palfrader.
16098 o Minor bugfixes (configuration, unit tests):
16099 - Only add the default fallback directories when the DirAuthorities,
16100 AlternateDirAuthority, and FallbackDir directory config options
16101 are set to their defaults. The default fallback directory list is
16102 currently empty, this fix will only change tor's behavior when it
16103 has default fallback directories. Includes unit tests for
16104 consider_adding_dir_servers(). Fixes bug 15642; bugfix on
16105 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
16107 o Minor bugfixes (controller):
16108 - Add the descriptor ID in each HS_DESC control event. It was
16109 missing, but specified in control-spec.txt. Fixes bug 15881;
16110 bugfix on 0.2.5.2-alpha.
16112 o Minor bugfixes (correctness):
16113 - For correctness, avoid modifying a constant string in
16114 handle_control_postdescriptor. Fixes bug 15546; bugfix
16116 - Remove side-effects from tor_assert() calls. This was harmless,
16117 because we never disable assertions, but it is bad style and
16118 unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
16120 - When calling channel_free_list(), avoid calling smartlist_remove()
16121 while inside a FOREACH loop. This partially reverts commit
16122 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
16123 incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
16125 o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
16126 - Check for failures from crypto_early_init, and refuse to continue.
16127 A previous typo meant that we could keep going with an
16128 uninitialized crypto library, and would have OpenSSL initialize
16129 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
16130 when implementing ticket 4900. Patch by "teor".
16132 o Minor bugfixes (hidden service):
16133 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
16134 a client authorized hidden service. Fixes bug 15823; bugfix
16136 - Remove an extraneous newline character from the end of hidden
16137 service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
16139 o Minor bugfixes (Linux seccomp2 sandbox):
16140 - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
16141 defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
16142 - Allow bridge authorities to run correctly under the seccomp2
16143 sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
16144 - Add the "hidserv-stats" filename to our sandbox filter for the
16145 HiddenServiceStatistics option to work properly. Fixes bug 17354;
16146 bugfix on 0.2.6.2-alpha. Patch from David Goulet.
16148 o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
16149 - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
16150 these when eventfd2() support is missing. Fixes bug 16363; bugfix
16151 on 0.2.6.3-alpha. Patch from "teor".
16153 o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
16154 - Allow systemd connections to work with the Linux seccomp2 sandbox
16155 code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
16157 - Fix sandboxing to work when running as a relay, by allowing the
16158 renaming of secret_id_key, and allowing the eventfd2 and futex
16159 syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
16162 o Minor bugfixes (logging):
16163 - When building Tor under Clang, do not include an extra set of
16164 parentheses in log messages that include function names. Fixes bug
16165 15269; bugfix on every released version of Tor when compiled with
16166 recent enough Clang.
16168 o Minor bugfixes (network):
16169 - When attempting to use fallback technique for network interface
16170 lookup, disregard loopback and multicast addresses since they are
16171 unsuitable for public communications.
16173 o Minor bugfixes (open file limit):
16174 - Fix set_max_file_descriptors() to set by default the max open file
16175 limit to the current limit when setrlimit() fails. Fixes bug
16176 16274; bugfix on tor- 0.2.0.10-alpha. Patch by dgoulet.
16178 o Minor bugfixes (portability):
16179 - Check correctly for Windows socket errors in the workqueue
16180 backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
16181 - Try harder to normalize the exit status of the Tor process to the
16182 standard-provided range. Fixes bug 16975; bugfix on every version
16184 - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
16185 of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak.
16187 o Minor bugfixes (relay):
16188 - Ensure that worker threads actually exit when a fatal error or
16189 shutdown is indicated. This fix doesn't currently affect the
16190 behavior of Tor, because Tor workers never indicates fatal error
16191 or shutdown except in the unit tests. Fixes bug 16868; bugfix
16193 - Fix a rarely-encountered memory leak when failing to initialize
16194 the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
16195 from "cypherpunks".
16196 - Unblock threads before releasing the work queue mutex to ensure
16197 predictable scheduling behavior. Fixes bug 16644; bugfix
16200 o Minor bugfixes (security, exit policies):
16201 - ExitPolicyRejectPrivate now also rejects the relay's published
16202 IPv6 address (if any), and any publicly routable IPv4 or IPv6
16203 addresses on any local interfaces. ticket 17027. Patch by "teor".
16204 Fixes bug 17027; bugfix on 0.2.0.11-alpha.
16206 o Minor bugfixes (statistics):
16207 - Disregard the ConnDirectionStatistics torrc options when Tor is
16208 not a relay since in that mode of operation no sensible data is
16209 being collected and because Tor might run into measurement hiccups
16210 when running as a client for some time, then becoming a relay.
16211 Fixes bug 15604; bugfix on 0.2.2.35.
16213 o Minor bugfixes (systemd):
16214 - Tor's systemd unit file no longer contains extraneous spaces.
16215 These spaces would sometimes confuse tools like deb-systemd-
16216 helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
16218 o Minor bugfixes (test networks):
16219 - When self-testing reachability, use ExtendAllowPrivateAddresses to
16220 determine if local/private addresses imply reachability. The
16221 previous fix used TestingTorNetwork, which implies
16222 ExtendAllowPrivateAddresses, but this excluded rare configurations
16223 where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
16224 not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
16225 issue discovered by CJ Ess.
16227 o Minor bugfixes (tests, also in 0.2.6.9):
16228 - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
16229 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
16231 o Code simplification and refactoring:
16232 - Change the function that's called when we need to retry all
16233 downloads so that it only reschedules the downloads to happen
16234 immediately, rather than launching them all at once itself. This
16235 further simplifies Tor's callgraph.
16236 - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
16237 to ensure they remain consistent and visible everywhere.
16238 - Move some format-parsing functions out of crypto.c and
16239 crypto_curve25519.c into crypto_format.c and/or util_format.c.
16240 - Move the client-only parts of init_keys() into a separate
16241 function. Closes ticket 16763.
16242 - Move the hacky fallback code out of get_interface_address6() into
16243 separate function and get it covered with unit-tests. Resolves
16245 - Refactor hidden service client-side cache lookup to intelligently
16246 report its various failure cases, and disentangle failure cases
16247 involving a lack of introduction points. Closes ticket 14391.
16248 - Remove some vestigial workarounds for the MSVC6 compiler. We
16249 haven't supported that in ages.
16250 - Remove the unused "nulterminate" argument from buf_pullup().
16251 - Simplify the microdesc_free() implementation so that it no longer
16252 appears (to code analysis tools) to potentially invoke a huge
16253 suite of other microdesc functions.
16254 - Simply the control graph further by deferring the inner body of
16255 directory_all_unreachable() into a callback. Closes ticket 16762.
16256 - The link authentication code has been refactored for better
16257 testability and reliability. It now uses code generated with the
16258 "trunnel" binary encoding generator, to reduce the risk of bugs
16259 due to programmer error. Done as part of ticket 12498.
16260 - Treat the loss of an owning controller as equivalent to a SIGTERM
16261 signal. This removes a tiny amount of duplicated code, and
16262 simplifies our callgraph. Closes ticket 16788.
16263 - Use our own Base64 encoder instead of OpenSSL's, to allow more
16264 control over the output. Part of ticket 15652.
16265 - When generating an event to send to the controller, we no longer
16266 put the event over the network immediately. Instead, we queue
16267 these events, and use a Libevent callback to deliver them. This
16268 change simplifies Tor's callgraph by reducing the number of
16269 functions from which all other Tor functions are reachable. Closes
16271 - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
16272 that try to scan or compile every file on Unix won't decide that
16276 - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
16277 - Improve the descriptions of statistics-related torrc options in
16278 the manpage to describe rationale and possible uses cases. Fixes
16280 - Improve the layout and formatting of ./configure --help messages.
16281 Closes ticket 15024. Patch from "cypherpunks".
16282 - Include a specific and (hopefully) accurate documentation of the
16283 torrc file's meta-format in doc/torrc_format.txt. This is mainly
16284 of interest to people writing programs to parse or generate torrc
16285 files. This document is not a commitment to long-term
16286 compatibility; some aspects of the current format are a bit
16287 ridiculous. Closes ticket 2325.
16288 - Include the TUNING document in our source tarball. It is referred
16289 to in the ChangeLog and an error message. Fixes bug 16929; bugfix
16291 - Note that HiddenServicePorts can take a unix domain socket. Closes
16293 - Recommend a 40 GB example AccountingMax in torrc.sample rather
16294 than a 4 GB max. Closes ticket 16742.
16295 - Standardize on the term "server descriptor" in the manual page.
16296 Previously, we had used "router descriptor", "server descriptor",
16297 and "relay descriptor" interchangeably. Part of ticket 14987.
16298 - Advise users on how to configure separate IPv4 and IPv6 exit
16299 policies in the manpage and sample torrcs. Related to ticket 16069.
16300 - Fix an error in the manual page and comments for
16301 TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
16302 required "ORPort connectivity". While this is true, it is in no
16303 way unique to the HSDir flag. Of all the flags, only HSDirs need a
16304 DirPort configured in order for the authorities to assign that
16305 particular flag. Patch by "teor". Fixed as part of 14882; bugfix
16307 - Fix the usage message of tor-resolve(1) so that it no longer lists
16308 the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
16311 - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
16312 and always use the internal Base64 decoder. The internal decoder
16313 has been part of tor since 0.2.0.10-alpha, and no one should
16314 be using the OpenSSL one. Part of ticket 15652.
16315 - Remove the 'tor_strclear()' function; use memwipe() instead.
16316 Closes ticket 14922.
16317 - Remove the code that would try to aggressively flush controller
16318 connections while writing to them. This code was introduced in
16319 0.1.2.7-alpha, in order to keep output buffers from exceeding
16320 their limits. But there is no longer a maximum output buffer size,
16321 and flushing data in this way caused some undesirable recursions
16322 in our call graph. Closes ticket 16480.
16323 - The internal pure-C tor-fw-helper tool is now removed from the Tor
16324 distribution, in favor of the pure-Go clone available from
16325 https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
16326 used by the C tor-fw-helper are not, in our opinion, very
16327 confidence- inspiring in their secure-programming techniques.
16328 Closes ticket 13338.
16330 o Removed features:
16331 - Remove the (seldom-used) DynamicDHGroups feature. For anti-
16332 fingerprinting we now recommend pluggable transports; for forward-
16333 secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
16334 - Remove the HidServDirectoryV2 option. Now all relays offer to
16335 store hidden service descriptors. Related to 16543.
16336 - Remove the VoteOnHidServDirectoriesV2 option, since all
16337 authorities have long set it to 1. Closes ticket 16543.
16338 - Remove the undocumented "--digests" command-line option. It
16339 complicated our build process, caused subtle build issues on
16340 multiple platforms, and is now redundant since we started
16341 including git version identifiers. Closes ticket 14742.
16342 - Tor no longer contains checks for ancient directory cache versions
16343 that didn't know about microdescriptors.
16344 - Tor no longer contains workarounds for stat files generated by
16345 super-old versions of Tor that didn't choose guards sensibly.
16348 - The test-network.sh script now supports performance testing.
16349 Requires corresponding chutney performance testing changes. Patch
16350 by "teor". Closes ticket 14175.
16351 - Add a new set of callgraph analysis scripts that use clang to
16352 produce a list of which Tor functions are reachable from which
16353 other Tor functions. We're planning to use these to help simplify
16354 our code structure by identifying illogical dependencies.
16355 - Add new 'test-full' and 'test-full-online' targets to run all
16356 tests, including integration tests with stem and chutney.
16357 - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
16358 by-side in the same parent directory. Closes ticket 16903. Patch
16360 - Document use of coverity, clang static analyzer, and clang dynamic
16361 undefined behavior and address sanitizers in doc/HACKING. Include
16362 detailed usage instructions in the blacklist. Patch by "teor".
16363 Closes ticket 15817.
16364 - Make "bridges+hs" the default test network. This tests almost all
16365 tor functionality during make test-network, while allowing tests
16366 to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
16367 test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
16368 (chutney). Patches by "teor".
16369 - Make the test-workqueue test work on Windows by initializing the
16370 network before we begin.
16371 - New make target (make test-network-all) to run multiple applicable
16372 chutney test cases. Patch from Teor; closes 16953.
16373 - Now that OpenSSL has its own scrypt implementation, add an unit
16374 test that checks for interoperability between libscrypt_scrypt()
16375 and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
16376 and rely on EVP_PBE_scrypt() whenever possible. Resolves
16378 - The link authentication protocol code now has extensive tests.
16379 - The relay descriptor signature testing code now has
16381 - The test_workqueue program now runs faster, and is enabled by
16382 default as a part of "make check".
16383 - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
16384 functions in dns.c. Implements a portion of ticket 16831.
16385 - Use environment variables rather than autoconf substitutions to
16386 send variables from the build system to the test scripts. This
16387 change should be easier to maintain, and cause 'make distcheck' to
16388 work better than before. Fixes bug 17148.
16389 - When building Tor with testing coverage enabled, run Chutney tests
16390 (if any) using the 'tor-cov' coverage binary.
16391 - When running test-network or test-stem, check for the absence of
16392 stem/chutney before doing any build operations.
16393 - Add a test to verify that the compiler does not eliminate our
16394 memwipe() implementation. Closes ticket 15377.
16395 - Add make rule `check-changes` to verify the format of changes
16396 files. Closes ticket 15180.
16397 - Add unit tests for control_event_is_interesting(). Add a compile-
16398 time check that the number of events doesn't exceed the capacity
16399 of control_event_t.event_mask. Closes ticket 15431, checks for
16400 bugs similar to 13085. Patch by "teor".
16401 - Command-line argument tests moved to Stem. Resolves ticket 14806.
16402 - Integrate the ntor, backtrace, and zero-length keys tests into the
16403 automake test suite. Closes ticket 15344.
16404 - Remove assertions during builds to determine Tor's test coverage.
16405 We don't want to trigger these even in assertions, so including
16406 them artificially makes our branch coverage look worse than it is.
16407 This patch provides the new test-stem-full and coverage-html-full
16408 configure options. Implements ticket 15400.
16409 - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
16410 explicitly manage consensus flags in testing networks. Patch by
16411 "robgjansen", modified by "teor". Implements part of ticket 14882.
16412 - Check for matching value in server response in ntor_ref.py. Fixes
16413 bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
16415 - Set the severity correctly when testing
16416 get_interface_addresses_ifaddrs() and
16417 get_interface_addresses_win32(), so that the tests fail gracefully
16418 instead of triggering an assertion. Fixes bug 15759; bugfix on
16419 0.2.6.3-alpha. Reported by Nicolas Derive.
16421 Changes in version 0.2.6.10 - 2015-07-12
16422 Tor version 0.2.6.10 fixes some significant stability and hidden
16423 service client bugs, bulletproofs the cryptography init process, and
16424 fixes a bug when using the sandbox code with some older versions of
16425 Linux. Everyone running an older version, especially an older version
16426 of 0.2.6, should upgrade.
16428 o Major bugfixes (hidden service clients, stability):
16429 - Stop refusing to store updated hidden service descriptors on a
16430 client. This reverts commit 9407040c59218 (which indeed fixed bug
16431 14219, but introduced a major hidden service reachability
16432 regression detailed in bug 16381). This is a temporary fix since
16433 we can live with the minor issue in bug 14219 (it just results in
16434 some load on the network) but the regression of 16381 is too much
16435 of a setback. First-round fix for bug 16381; bugfix
16438 o Major bugfixes (stability):
16439 - Stop crashing with an assertion failure when parsing certain kinds
16440 of malformed or truncated microdescriptors. Fixes bug 16400;
16441 bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
16442 by "cypherpunks_backup".
16443 - Stop random client-side assertion failures that could occur when
16444 connecting to a busy hidden service, or connecting to a hidden
16445 service while a NEWNYM is in progress. Fixes bug 16013; bugfix
16448 o Minor features (geoip):
16449 - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
16450 - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
16452 o Minor bugfixes (crypto error-handling):
16453 - Check for failures from crypto_early_init, and refuse to continue.
16454 A previous typo meant that we could keep going with an
16455 uninitialized crypto library, and would have OpenSSL initialize
16456 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
16457 when implementing ticket 4900. Patch by "teor".
16459 o Minor bugfixes (Linux seccomp2 sandbox):
16460 - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
16461 these when eventfd2() support is missing. Fixes bug 16363; bugfix
16462 on 0.2.6.3-alpha. Patch from "teor".
16465 Changes in version 0.2.6.9 - 2015-06-11
16466 Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
16467 requirements for receiving an HSDir flag, and addresses some other small
16468 bugs in the systemd and sandbox code. Clients using circuit isolation
16469 should upgrade; all directory authorities should upgrade.
16471 o Major bugfixes (client-side privacy):
16472 - Properly separate out each SOCKSPort when applying stream
16473 isolation. The error occurred because each port's session group was
16474 being overwritten by a default value when the listener connection
16475 was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
16478 o Minor feature (directory authorities, security):
16479 - The HSDir flag given by authorities now requires the Stable flag.
16480 For the current network, this results in going from 2887 to 2806
16481 HSDirs. Also, it makes it harder for an attacker to launch a sybil
16482 attack by raising the effort for a relay to become Stable which
16483 takes at the very least 7 days to do so and by keeping the 96
16484 hours uptime requirement for HSDir. Implements ticket 8243.
16486 o Minor bugfixes (compilation):
16487 - Build with --enable-systemd correctly when libsystemd is
16488 installed, but systemd is not. Fixes bug 16164; bugfix on
16489 0.2.6.3-alpha. Patch from Peter Palfrader.
16491 o Minor bugfixes (Linux seccomp2 sandbox):
16492 - Fix sandboxing to work when running as a relaymby renaming of
16493 secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
16494 bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
16495 - Allow systemd connections to work with the Linux seccomp2 sandbox
16496 code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
16499 o Minor bugfixes (tests):
16500 - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
16501 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
16504 Changes in version 0.2.6.8 - 2015-05-21
16505 Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
16506 fixes an authority-side bug in assigning the HSDir flag. All directory
16507 authorities should upgrade.
16509 o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
16510 - Revert commit that made directory authorities assign the HSDir
16511 flag to relays without a DirPort; this was bad because such relays
16512 can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
16515 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
16516 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
16517 a client authorized hidden service. Fixes bug 15823; bugfix
16520 o Minor features (geoip):
16521 - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
16522 - Update geoip6 to the April 8 2015 Maxmind GeoLite2
16526 Changes in version 0.2.6.7 - 2015-04-06
16527 Tor 0.2.6.7 fixes two security issues that could be used by an
16528 attacker to crash hidden services, or crash clients visiting hidden
16529 services. Hidden services should upgrade as soon as possible; clients
16530 should upgrade whenever packages become available.
16532 This release also contains two simple improvements to make hidden
16533 services a bit less vulnerable to denial-of-service attacks.
16535 o Major bugfixes (security, hidden service):
16536 - Fix an issue that would allow a malicious client to trigger an
16537 assertion failure and halt a hidden service. Fixes bug 15600;
16538 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
16539 - Fix a bug that could cause a client to crash with an assertion
16540 failure when parsing a malformed hidden service descriptor. Fixes
16541 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
16543 o Minor features (DoS-resistance, hidden service):
16544 - Introduction points no longer allow multiple INTRODUCE1 cells to
16545 arrive on the same circuit. This should make it more expensive for
16546 attackers to overwhelm hidden services with introductions.
16547 Resolves ticket 15515.
16548 - Decrease the amount of reattempts that a hidden service performs
16549 when its rendezvous circuits fail. This reduces the computational
16550 cost for running a hidden service under heavy load. Resolves
16554 Changes in version 0.2.5.12 - 2015-04-06
16555 Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
16556 could be used by an attacker to crash hidden services, or crash clients
16557 visiting hidden services. Hidden services should upgrade as soon as
16558 possible; clients should upgrade whenever packages become available.
16560 This release also backports a simple improvement to make hidden
16561 services a bit less vulnerable to denial-of-service attacks.
16563 o Major bugfixes (security, hidden service):
16564 - Fix an issue that would allow a malicious client to trigger an
16565 assertion failure and halt a hidden service. Fixes bug 15600;
16566 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
16567 - Fix a bug that could cause a client to crash with an assertion
16568 failure when parsing a malformed hidden service descriptor. Fixes
16569 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
16571 o Minor features (DoS-resistance, hidden service):
16572 - Introduction points no longer allow multiple INTRODUCE1 cells to
16573 arrive on the same circuit. This should make it more expensive for
16574 attackers to overwhelm hidden services with introductions.
16575 Resolves ticket 15515.
16578 Changes in version 0.2.4.27 - 2015-04-06
16579 Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
16580 could be used by an attacker to crash hidden services, or crash clients
16581 visiting hidden services. Hidden services should upgrade as soon as
16582 possible; clients should upgrade whenever packages become available.
16584 This release also backports a simple improvement to make hidden
16585 services a bit less vulnerable to denial-of-service attacks.
16587 o Major bugfixes (security, hidden service):
16588 - Fix an issue that would allow a malicious client to trigger an
16589 assertion failure and halt a hidden service. Fixes bug 15600;
16590 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
16591 - Fix a bug that could cause a client to crash with an assertion
16592 failure when parsing a malformed hidden service descriptor. Fixes
16593 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
16595 o Minor features (DoS-resistance, hidden service):
16596 - Introduction points no longer allow multiple INTRODUCE1 cells to
16597 arrive on the same circuit. This should make it more expensive for
16598 attackers to overwhelm hidden services with introductions.
16599 Resolves ticket 15515.
16602 Changes in version 0.2.6.6 - 2015-03-24
16603 Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
16605 It adds numerous safety, security, correctness, and performance
16606 improvements. Client programs can be configured to use more kinds of
16607 sockets, AutomapHosts works better, the multithreading backend is
16608 improved, cell transmission is refactored, test coverage is much
16609 higher, more denial-of-service attacks are handled, guard selection is
16610 improved to handle long-term guards better, pluggable transports
16611 should work a bit better, and some annoying hidden service performance
16612 bugs should be addressed.
16614 o New compiler and system requirements:
16615 - Tor 0.2.6.x requires that your compiler support more of the C99
16616 language standard than before. The 'configure' script now detects
16617 whether your compiler supports C99 mid-block declarations and
16618 designated initializers. If it does not, Tor will not compile.
16620 We may revisit this requirement if it turns out that a significant
16621 number of people need to build Tor with compilers that don't
16622 bother implementing a 15-year-old standard. Closes ticket 13233.
16623 - Tor no longer supports systems without threading support. When we
16624 began working on Tor, there were several systems that didn't have
16625 threads, or where the thread support wasn't able to run the
16626 threads of a single process on multiple CPUs. That no longer
16627 holds: every system where Tor needs to run well now has threading
16628 support. Resolves ticket 12439.
16630 o Deprecated versions and removed support:
16631 - Tor relays older than 0.2.4.18-rc are no longer allowed to
16632 advertise themselves on the network. Closes ticket 13555.
16633 - Tor clients no longer support connecting to hidden services
16634 running on Tor 0.2.2.x and earlier; the Support022HiddenServices
16635 option has been removed. (There shouldn't be any hidden services
16636 running these versions on the network.) Closes ticket 7803.
16638 o Directory authority changes:
16639 - The directory authority Faravahar has a new IP address. This
16640 closes ticket 14487.
16641 - Remove turtles as a directory authority.
16642 - Add longclaw as a new (v3) directory authority. This implements
16643 ticket 13296. This keeps the directory authority count at 9.
16645 o Major features (bridges):
16646 - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
16647 transports if they are configured via the "TOR_PT_PROXY"
16648 environment variable. Implements proposal 232. Resolves
16651 o Major features (changed defaults):
16652 - Prevent relay operators from unintentionally running exits: When a
16653 relay is configured as an exit node, we now warn the user unless
16654 the "ExitRelay" option is set to 1. We warn even more loudly if
16655 the relay is configured with the default exit policy, since this
16656 can indicate accidental misconfiguration. Setting "ExitRelay 0"
16657 stops Tor from running as an exit relay. Closes ticket 10067.
16659 o Major features (client performance, hidden services):
16660 - Allow clients to use optimistic data when connecting to a hidden
16661 service, which should remove a round-trip from hidden service
16662 initialization. See proposal 181 for details. Implements
16665 o Major features (directory system):
16666 - Upon receiving an unparseable directory object, if its digest
16667 matches what we expected, then don't try to download it again.
16668 Previously, when we got a descriptor we didn't like, we would keep
16669 trying to download it over and over. Closes ticket 11243.
16670 - When downloading server- or microdescriptors from a directory
16671 server, we no longer launch multiple simultaneous requests to the
16672 same server. This reduces load on the directory servers,
16673 especially when directory guards are in use. Closes ticket 9969.
16674 - When downloading server- or microdescriptors over a tunneled
16675 connection, do not limit the length of our requests to what the
16676 Squid proxy is willing to handle. Part of ticket 9969.
16677 - Authorities can now vote on the correct digests and latest
16678 versions for different software packages. This allows packages
16679 that include Tor to use the Tor authority system as a way to get
16680 notified of updates and their correct digests. Implements proposal
16681 227. Closes ticket 10395.
16683 o Major features (guards):
16684 - Introduce the Guardfraction feature to improves load balancing on
16685 guard nodes. Specifically, it aims to reduce the traffic gap that
16686 guard nodes experience when they first get the Guard flag. This is
16687 a required step if we want to increase the guard lifetime to 9
16688 months or greater. Closes ticket 9321.
16690 o Major features (hidden services):
16691 - Make HS port scanning more difficult by immediately closing the
16692 circuit when a user attempts to connect to a nonexistent port.
16693 Closes ticket 13667.
16694 - Add a HiddenServiceStatistics option that allows Tor relays to
16695 gather and publish statistics about the overall size and volume of
16696 hidden service usage. Specifically, when this option is turned on,
16697 an HSDir will publish an approximate number of hidden services
16698 that have published descriptors to it the past 24 hours. Also, if
16699 a relay has acted as a hidden service rendezvous point, it will
16700 publish the approximate amount of rendezvous cells it has relayed
16701 the past 24 hours. The statistics themselves are obfuscated so
16702 that the exact values cannot be derived. For more details see
16703 proposal 238, "Better hidden service stats from Tor relays". This
16704 feature is currently disabled by default. Implements feature 13192.
16706 o Major features (performance):
16707 - Make the CPU worker implementation more efficient by avoiding the
16708 kernel and lengthening pipelines. The original implementation used
16709 sockets to transfer data from the main thread to the workers, and
16710 didn't allow any thread to be assigned more than a single piece of
16711 work at once. The new implementation avoids communications
16712 overhead by making requests in shared memory, avoiding kernel IO
16713 where possible, and keeping more requests in flight at once.
16714 Implements ticket 9682.
16716 o Major features (relay):
16717 - Raise the minimum acceptable configured bandwidth rate for bridges
16718 to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
16719 20 KiB/sec.) Closes ticket 13822.
16720 - Complete revision of the code that relays use to decide which cell
16721 to send next. Formerly, we selected the best circuit to write on
16722 each channel, but we didn't select among channels in any
16723 sophisticated way. Now, we choose the best circuits globally from
16724 among those whose channels are ready to deliver traffic.
16726 This patch implements a new inter-cmux comparison API, a global
16727 high/low watermark mechanism and a global scheduler loop for
16728 transmission prioritization across all channels as well as among
16729 circuits on one channel. This schedule is currently tuned to
16730 (tolerantly) avoid making changes in network performance, but it
16731 should form the basis for major circuit performance increases in
16732 the future. Code by Andrea; tuning by Rob Jansen; implements
16735 o Major features (sample torrc):
16736 - Add a new, infrequently-changed "torrc.minimal". This file is
16737 similar to torrc.sample, but it will change as infrequently as
16738 possible, for the benefit of users whose systems prompt them for
16739 intervention whenever a default configuration file is changed.
16740 Making this change allows us to update torrc.sample to be a more
16741 generally useful "sample torrc".
16743 o Major features (security, unix domain sockets):
16744 - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
16745 applications can reach Tor without having to create AF_INET or
16746 AF_INET6 sockets, meaning they can completely disable their
16747 ability to make non-Tor network connections. To create a socket of
16748 this type, use "SocksPort unix:/path/to/socket". Implements
16750 - Support mapping hidden service virtual ports to AF_UNIX sockets.
16751 The syntax is "HiddenServicePort 80 unix:/path/to/socket".
16752 Implements ticket 11485.
16754 o Major bugfixes (client, automap):
16755 - Repair automapping with IPv6 addresses. This automapping should
16756 have worked previously, but one piece of debugging code that we
16757 inserted to detect a regression actually caused the regression to
16758 manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
16759 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
16762 o Major bugfixes (crash, OSX, security):
16763 - Fix a remote denial-of-service opportunity caused by a bug in
16764 OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
16767 o Major bugfixes (directory authorities):
16768 - Do not assign the HSDir flag to relays if they are not Valid, or
16769 currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
16771 o Major bugfixes (directory bandwidth performance):
16772 - Don't flush the zlib buffer aggressively when compressing
16773 directory information for clients. This should save about 7% of
16774 the bandwidth currently used for compressed descriptors and
16775 microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
16777 o Major bugfixes (exit node stability):
16778 - Fix an assertion failure that could occur under high DNS load.
16779 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
16780 diagnosed and fixed by "cypherpunks".
16782 o Major bugfixes (FreeBSD IPFW transparent proxy):
16783 - Fix address detection with FreeBSD transparent proxies, when
16784 "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
16787 o Major bugfixes (hidden services):
16788 - When closing an introduction circuit that was opened in parallel
16789 with others, don't mark the introduction point as unreachable.
16790 Previously, the first successful connection to an introduction
16791 point would make the other introduction points get marked as
16792 having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
16794 o Major bugfixes (Linux seccomp2 sandbox):
16795 - Upon receiving sighup with the seccomp2 sandbox enabled, do not
16796 crash during attempts to call wait4. Fixes bug 15088; bugfix on
16797 0.2.5.1-alpha. Patch from "sanic".
16799 o Major bugfixes (mixed relay-client operation):
16800 - When running as a relay and client at the same time (not
16801 recommended), if we decide not to use a new guard because we want
16802 to retry older guards, only close the locally-originating circuits
16803 passing through that guard. Previously we would close all the
16804 circuits through that guard. Fixes bug 9819; bugfix on
16805 0.2.1.1-alpha. Reported by "skruffy".
16807 o Major bugfixes (pluggable transports):
16808 - Initialize the extended OR Port authentication cookie before
16809 launching pluggable transports. This prevents a race condition
16810 that occurred when server-side pluggable transports would cache the
16811 authentication cookie before it has been (re)generated. Fixes bug
16812 15240; bugfix on 0.2.5.1-alpha.
16814 o Major bugfixes (relay, stability, possible security):
16815 - Fix a bug that could lead to a relay crashing with an assertion
16816 failure if a buffer of exactly the wrong layout is passed to
16817 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
16818 0.2.0.10-alpha. Patch from "cypherpunks".
16819 - Do not assert if the 'data' pointer on a buffer is advanced to the
16820 very end of the buffer; log a BUG message instead. Only assert if
16821 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
16823 o Minor features (build):
16824 - New --disable-system-torrc compile-time option to prevent Tor from
16825 looking for the system-wide torrc or torrc-defaults files.
16826 Resolves ticket 13037.
16828 o Minor features (client):
16829 - Clients are now willing to send optimistic data (before they
16830 receive a 'connected' cell) to relays of any version. (Relays
16831 without support for optimistic data are no longer supported on the
16832 Tor network.) Resolves ticket 13153.
16834 o Minor features (client):
16835 - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
16836 is enabled, reject requests with IP addresses as hostnames.
16837 Resolves ticket 13315.
16839 o Minor features (controller):
16840 - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
16841 write an unscheduled heartbeat message to the log. Implements
16843 - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
16844 events so controllers can observe circuit isolation inputs. Closes
16846 - ControlPort now supports the unix:/path/to/socket syntax as an
16847 alternative to the ControlSocket option, for consistency with
16848 SocksPort and HiddenServicePort. Closes ticket 14451.
16849 - New "GETINFO bw-event-cache" to get information about recent
16850 bandwidth events. Closes ticket 14128. Useful for controllers to
16851 get recent bandwidth history after the fix for ticket 13988.
16852 - Messages about problems in the bootstrap process now include
16853 information about the server we were trying to connect to when we
16854 noticed the problem. Closes ticket 15006.
16856 o Minor features (Denial of service resistance):
16857 - Count the total number of bytes used storing hidden service
16858 descriptors against the value of MaxMemInQueues. If we're low on
16859 memory, and more than 20% of our memory is used holding hidden
16860 service descriptors, free them until no more than 10% of our
16861 memory holds hidden service descriptors. Free the least recently
16862 fetched descriptors first. Resolves ticket 13806.
16863 - When we have recently been under memory pressure (over 3/4 of
16864 MaxMemInQueues is allocated), then allocate smaller zlib objects
16865 for small requests. Closes ticket 11791.
16867 o Minor features (directory authorities):
16868 - Don't list relays with a bandwidth estimate of 0 in the consensus.
16869 Implements a feature proposed during discussion of bug 13000.
16870 - In tor-gencert, report an error if the user provides the same
16871 argument more than once.
16872 - If a directory authority can't find a best consensus method in the
16873 votes that it holds, it now falls back to its favorite consensus
16874 method. Previously, it fell back to method 1. Neither of these is
16875 likely to get enough signatures, but "fall back to favorite"
16876 doesn't require us to maintain support an obsolete consensus
16877 method. Implements part of proposal 215.
16879 o Minor features (geoip):
16880 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
16881 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
16884 o Minor features (guard nodes):
16885 - Reduce the time delay before saving guard status to disk from 10
16886 minutes to 30 seconds (or from one hour to 10 minutes if
16887 AvoidDiskWrites is set). Closes ticket 12485.
16889 o Minor features (heartbeat):
16890 - On relays, report how many connections we negotiated using each
16891 version of the Tor link protocols. This information will let us
16892 know if removing support for very old versions of the Tor
16893 protocols is harming the network. Closes ticket 15212.
16895 o Minor features (hidden service):
16896 - Make Sybil attacks against hidden services harder by changing the
16897 minimum time required to get the HSDir flag from 25 hours up to 96
16898 hours. Addresses ticket 14149.
16899 - New option "HiddenServiceAllowUnknownPorts" to allow hidden
16900 services to disable the anti-scanning feature introduced in
16901 0.2.6.2-alpha. With this option not set, a connection to an
16902 unlisted port closes the circuit. With this option set, only a
16903 RELAY_DONE cell is sent. Closes ticket 14084.
16904 - When re-enabling the network, don't try to build introduction
16905 circuits until we have successfully built a circuit. This makes
16906 hidden services come up faster when the network is re-enabled.
16907 Patch from "akwizgran". Closes ticket 13447.
16908 - When we fail to retrieve a hidden service descriptor, send the
16909 controller an "HS_DESC FAILED" controller event. Implements
16911 - New HiddenServiceDirGroupReadable option to cause hidden service
16912 directories and hostname files to be created group-readable. Patch
16913 from "anon", David Stainton, and "meejah". Closes ticket 11291.
16915 o Minor features (interface):
16916 - Implement "-f -" command-line option to read torrc configuration
16917 from standard input, if you don't want to store the torrc file in
16918 the file system. Implements feature 13865.
16920 o Minor features (logging):
16921 - Add a count of unique clients to the bridge heartbeat message.
16922 Resolves ticket 6852.
16923 - Suppress "router info incompatible with extra info" message when
16924 reading extrainfo documents from cache. (This message got loud
16925 around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
16927 - Elevate hidden service authorized-client message from DEBUG to
16928 INFO. Closes ticket 14015.
16929 - On Unix-like systems, you can now use named pipes as the target of
16930 the Log option, and other options that try to append to files.
16931 Closes ticket 12061. Patch from "carlo von lynX".
16932 - When opening a log file at startup, send it every log message that
16933 we generated between startup and opening it. Previously, log
16934 messages that were generated before opening the log file were only
16935 logged to stdout. Closes ticket 6938.
16936 - Add a TruncateLogFile option to overwrite logs instead of
16937 appending to them. Closes ticket 5583.
16938 - Quiet some log messages in the heartbeat and at startup. Closes
16941 o Minor features (portability, Solaris):
16942 - Threads are no longer disabled by default on Solaris; we believe
16943 that the versions of Solaris with broken threading support are all
16944 obsolete by now. Resolves ticket 9495.
16946 o Minor features (relay):
16947 - Re-check our address after we detect a changed IP address from
16948 getsockname(). This ensures that the controller command "GETINFO
16949 address" will report the correct value. Resolves ticket 11582.
16951 - A new AccountingRule option lets Relays set whether they'd like
16952 AccountingMax to be applied separately to inbound and outbound
16953 traffic, or applied to the sum of inbound and outbound traffic.
16954 Resolves ticket 961. Patch by "chobe".
16955 - When identity keypair is generated for first time, log a
16956 congratulatory message that links to the new relay lifecycle
16957 document. Implements feature 10427.
16959 o Minor features (security, memory wiping):
16960 - Ensure we securely wipe keys from memory after
16961 crypto_digest_get_digest and init_curve25519_keypair_from_file
16962 have finished using them. Resolves ticket 13477.
16964 o Minor features (security, out-of-memory handling):
16965 - When handling an out-of-memory condition, allocate less memory for
16966 temporary data structures. Fixes issue 10115.
16967 - When handling an out-of-memory condition, consider more types of
16968 buffers, including those on directory connections, and zlib
16969 buffers. Resolves ticket 11792.
16971 o Minor features (stability):
16972 - Add assertions in our hash-table iteration code to check for
16973 corrupted values that could cause infinite loops. Closes
16976 o Minor features (systemd):
16977 - Various improvements and modernizations in systemd hardening
16978 support. Closes ticket 13805. Patch from Craig Andrews.
16979 - Where supported, when running with systemd, report successful
16980 startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
16981 - When running with systemd, support systemd watchdog messages. Part
16982 of ticket 11016. Patch by Michael Scherer.
16984 o Minor features (testing networks):
16985 - Add the TestingDirAuthVoteExit option, which lists nodes to assign
16986 the "Exit" flag regardless of their uptime, bandwidth, or exit
16987 policy. TestingTorNetwork must be set for this option to have any
16988 effect. Previously, authorities would take up to 35 minutes to
16989 give nodes the Exit flag in a test network. Partially implements
16991 - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
16992 and the default on a testing network to 2 minutes. Drop the
16993 MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
16994 keep the default on a testing network at 30 seconds. This reduces
16995 HS bootstrap time to around 25 seconds. Also, change the default
16996 time in test-network.sh to match. Closes ticket 13401. Patch
16998 - Create TestingDirAuthVoteHSDir to correspond to
16999 TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
17000 HSDir flag for the listed relays regardless of uptime or ORPort
17001 connectivity. Respects the value of VoteOnHidServDirectoriesV2.
17002 Partial implementation for ticket 14067. Patch by "teor".
17004 o Minor features (tor2web mode):
17005 - Introduce the config option Tor2webRendezvousPoints, which allows
17006 clients in Tor2webMode to select a specific Rendezvous Point to be
17007 used in HS circuits. This might allow better performance for
17008 Tor2Web nodes. Implements ticket 12844.
17010 o Minor features (transparent proxy):
17011 - Update the transparent proxy option checks to allow for both ipfw
17012 and pf on OS X. Closes ticket 14002.
17013 - Use the correct option when using IPv6 with transparent proxy
17014 support on Linux. Resolves 13808. Patch by Francisco Blas
17017 o Minor features (validation):
17018 - Check all date/time values passed to tor_timegm and
17019 parse_rfc1123_time for validity, taking leap years into account.
17020 Improves HTTP header validation. Implemented with bug 13476.
17021 - In correct_tm(), limit the range of values returned by system
17022 localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
17023 This means we don't have to deal with negative or too large dates,
17024 even if a clock is wrong. Otherwise we might fail to read a file
17025 written by us which includes such a date. Fixes bug 13476.
17026 - Stop allowing invalid address patterns like "*/24" that contain
17027 both a wildcard address and a bit prefix length. This affects all
17028 our address-range parsing code. Fixes bug 7484; bugfix
17031 o Minor bugfixes (bridge clients):
17032 - When configured to use a bridge without an identity digest (not
17033 recommended), avoid launching an extra channel to it when
17034 bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
17036 o Minor bugfixes (bridges):
17037 - When DisableNetwork is set, do not launch pluggable transport
17038 plugins, and if any are running, terminate them. Fixes bug 13213;
17039 bugfix on 0.2.3.6-alpha.
17041 o Minor bugfixes (C correctness):
17042 - Fix several instances of possible integer overflow/underflow/NaN.
17043 Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
17045 - In circuit_build_times_calculate_timeout() in circuitstats.c,
17046 avoid dividing by zero in the pareto calculations. This traps
17047 under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
17049 - Fix an integer overflow in format_time_interval(). Fixes bug
17050 13393; bugfix on 0.2.0.10-alpha.
17051 - Set the correct day of year value when the system's localtime(_r)
17052 or gmtime(_r) functions fail to set struct tm. Not externally
17053 visible. Fixes bug 13476; bugfix on 0.0.2pre14.
17054 - Avoid unlikely signed integer overflow in tor_timegm on systems
17055 with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
17057 o Minor bugfixes (certificate handling):
17058 - If an authority operator accidentally makes a signing certificate
17059 with a future publication time, do not discard its real signing
17060 certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
17061 - Remove any old authority certificates that have been superseded
17062 for at least two days. Previously, we would keep superseded
17063 certificates until they expired, if they were published close in
17064 time to the certificate that superseded them. Fixes bug 11454;
17065 bugfix on 0.2.1.8-alpha.
17067 o Minor bugfixes (client):
17068 - Fix smartlist_choose_node_by_bandwidth() so that relays with the
17069 BadExit flag are not considered worthy candidates. Fixes bug
17070 13066; bugfix on 0.1.2.3-alpha.
17071 - Use the consensus schedule for downloading consensuses, and not
17072 the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
17073 - Handle unsupported or malformed SOCKS5 requests properly by
17074 responding with the appropriate error message before closing the
17075 connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
17077 o Minor bugfixes (client, automapping):
17078 - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
17079 no value follows the option. Fixes bug 14142; bugfix on
17080 0.2.4.7-alpha. Patch by "teor".
17081 - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
17082 14195; bugfix on 0.1.0.1-rc.
17083 - Prevent changes to other options from removing the wildcard value
17084 "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
17086 - Allow MapAddress and AutomapHostsOnResolve to work together when
17087 an address is mapped into another address type (like .onion) that
17088 must be automapped at resolve time. Fixes bug 7555; bugfix
17091 o Minor bugfixes (client, bridges):
17092 - When we are using bridges and we had a network connectivity
17093 problem, only retry connecting to our currently configured
17094 bridges, not all bridges we know about and remember using. Fixes
17095 bug 14216; bugfix on 0.2.2.17-alpha.
17097 o Minor bugfixes (client, DNS):
17098 - Report the correct cached DNS expiration times on SOCKS port or in
17099 DNS replies. Previously, we would report everything as "never
17100 expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
17101 - Avoid a small memory leak when we find a cached answer for a
17102 reverse DNS lookup in a client-side DNS cache. (Remember, client-
17103 side DNS caching is off by default, and is not recommended.) Fixes
17104 bug 14259; bugfix on 0.2.0.1-alpha.
17106 o Minor bugfixes (client, IPv6):
17107 - Reject socks requests to literal IPv6 addresses when IPv6Traffic
17108 flag is not set; and not because the NoIPv4Traffic flag was set.
17109 Previously we'd looked at the NoIPv4Traffic flag for both types of
17110 literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
17112 o Minor bugfixes (client, microdescriptors):
17113 - Use a full 256 bits of the SHA256 digest of a microdescriptor when
17114 computing which microdescriptors to download. This keeps us from
17115 erroneous download behavior if two microdescriptor digests ever
17116 have the same first 160 bits. Fixes part of bug 13399; bugfix
17118 - Reset a router's status if its microdescriptor digest changes,
17119 even if the first 160 bits remain the same. Fixes part of bug
17120 13399; bugfix on 0.2.3.1-alpha.
17122 o Minor bugfixes (client, torrc):
17123 - Stop modifying the value of our DirReqStatistics torrc option just
17124 because we're not a bridge or relay. This bug was causing Tor
17125 Browser users to write "DirReqStatistics 0" in their torrc files
17126 as if they had chosen to change the config. Fixes bug 4244; bugfix
17128 - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
17129 that our options have changed every time we SIGHUP. Fixes bug
17130 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
17132 o Minor bugfixes (compilation):
17133 - Fix a compilation warning on s390. Fixes bug 14988; bugfix
17135 - Silence clang warnings under --enable-expensive-hardening,
17136 including implicit truncation of 64 bit values to 32 bit, const
17137 char assignment to self, tautological compare, and additional
17138 parentheses around equality tests. Fixes bug 13577; bugfix
17140 - Fix a clang warning about checking whether an address in the
17141 middle of a structure is NULL. Fixes bug 14001; bugfix
17143 - The address of an array in the middle of a structure will always
17144 be non-NULL. clang recognises this and complains. Disable the
17145 tautologous and redundant check to silence this warning. Fixes bug
17146 14001; bugfix on 0.2.1.2-alpha.
17147 - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
17148 Addresses ticket 14188.
17149 - Build without warnings with the stock OpenSSL srtp.h header, which
17150 has a duplicate declaration of SSL_get_selected_srtp_profile().
17151 Fixes bug 14220; this is OpenSSL's bug, not ours.
17152 - Do not compile any code related to Tor2Web mode when Tor2Web mode
17153 is not enabled at compile time. Previously, this code was included
17154 in a disabled state. See discussion on ticket 12844.
17155 - Allow our configure script to build correctly with autoconf 2.62
17156 again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
17157 - Improve the error message from ./configure to make it clear that
17158 when asciidoc has not been found, the user will have to either add
17159 --disable-asciidoc argument or install asciidoc. Resolves
17162 o Minor bugfixes (controller):
17163 - Report "down" in response to the "GETINFO entry-guards" command
17164 when relays are down with an unreachable_since value. Previously,
17165 we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
17166 - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
17167 14116; bugfix on 0.2.2.9-alpha.
17169 o Minor bugfixes (controller):
17170 - Return an error when the second or later arguments of the
17171 "setevents" controller command are invalid events. Previously we
17172 would return success while silently skipping invalid events. Fixes
17173 bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
17175 o Minor bugfixes (directory authority):
17176 - Allow directory authorities to fetch more data from one another if
17177 they find themselves missing lots of votes. Previously, they had
17178 been bumping against the 10 MB queued data limit. Fixes bug 14261;
17179 bugfix on 0.1.2.5-alpha.
17180 - Do not attempt to download extrainfo documents which we will be
17181 unable to validate with a matching server descriptor. Fixes bug
17182 13762; bugfix on 0.2.0.1-alpha.
17183 - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
17184 control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
17185 - Enlarge the buffer to read bwauth generated files to avoid an
17186 issue when parsing the file in dirserv_read_measured_bandwidths().
17187 Fixes bug 14125; bugfix on 0.2.2.1-alpha.
17188 - When running as a v3 directory authority, advertise that you serve
17189 extra-info documents so that clients who want them can find them
17190 from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
17192 o Minor bugfixes (directory system):
17193 - Always believe that v3 directory authorities serve extra-info
17194 documents, whether they advertise "caches-extra-info" or not.
17195 Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
17196 - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
17197 Previously, directories offering BRIDGE_DIRINFO and some other
17198 flag (i.e. microdescriptors or extrainfo) would be ignored when
17199 looking for bridges. Partially fixes bug 13163; bugfix
17202 o Minor bugfixes (file handling):
17203 - Stop failing when key files are zero-length. Instead, generate new
17204 keys, and overwrite the empty key files. Fixes bug 13111; bugfix
17205 on all versions of Tor. Patch by "teor".
17206 - Stop generating a fresh .old RSA onion key file when the .old file
17207 is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
17208 - Avoid overwriting .old key files with empty key files.
17209 - Skip loading zero-length extrainfo store, router store, stats,
17210 state, and key files.
17211 - Avoid crashing when trying to reload a torrc specified as a
17212 relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
17215 o Minor bugfixes (hidden services):
17216 - Close the introduction circuit when we have no more usable intro
17217 points, instead of waiting for it to time out. This also ensures
17218 that no follow-up HS descriptor fetch is triggered when the
17219 circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
17220 - When fetching a hidden service descriptor for a down service that
17221 was recently up, do not keep refetching until we try the same
17222 replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
17223 - Correctly send a controller event when we find that a rendezvous
17224 circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
17225 - Pre-check directory permissions for new hidden-services to avoid
17226 at least one case of "Bug: Acting on config options left us in a
17227 broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
17228 - When fetching hidden service descriptors, we now check not only
17229 for whether we got the hidden service we had in mind, but also
17230 whether we got the particular descriptors we wanted. This prevents
17231 a class of inefficient but annoying DoS attacks by hidden service
17232 directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
17235 o Minor bugfixes (Linux seccomp2 sandbox):
17236 - Make transparent proxy support work along with the seccomp2
17237 sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
17238 by Francisco Blas Izquierdo Riera.
17239 - Fix a memory leak in tor-resolve when running with the sandbox
17240 enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
17241 - Allow glibc fatal errors to be sent to stderr before Tor exits.
17242 Previously, glibc would try to write them to /dev/tty, and the
17243 sandbox would trap the call and make Tor exit prematurely. Fixes
17244 bug 14759; bugfix on 0.2.5.1-alpha.
17246 o Minor bugfixes (logging):
17247 - Avoid crashing when there are more log domains than entries in
17248 domain_list. Bugfix on 0.2.3.1-alpha.
17249 - Downgrade warnings about RSA signature failures to info log level.
17250 Emit a warning when an extra info document is found incompatible
17251 with a corresponding router descriptor. Fixes bug 9812; bugfix
17253 - Make connection_ap_handshake_attach_circuit() log the circuit ID
17254 correctly. Fixes bug 13701; bugfix on 0.0.6.
17256 o Minor bugfixes (networking):
17257 - Check for orconns and use connection_or_close_for_error() rather
17258 than connection_mark_for_close() directly in the getsockopt()
17259 failure case of connection_handle_write_impl(). Fixes bug 11302;
17260 bugfix on 0.2.4.4-alpha.
17262 o Minor bugfixes (parsing):
17263 - Stop accepting milliseconds (or other junk) at the end of
17264 descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
17265 - Support two-number and three-number version numbers correctly, in
17266 case we change the Tor versioning system in the future. Fixes bug
17267 13661; bugfix on 0.0.8pre1.
17269 o Minor bugfixes (portability):
17270 - Fix the ioctl()-based network interface lookup code so that it
17271 will work on systems that have variable-length struct ifreq, for
17273 - Use the correct datatype in the SipHash-2-4 function to prevent
17274 compilers from assuming any sort of alignment. Fixes bug 15436;
17275 bugfix on 0.2.5.3-alpha.
17277 o Minor bugfixes (preventative security, C safety):
17278 - When reading a hexadecimal, base-32, or base-64 encoded value from
17279 a string, always overwrite the whole output buffer. This prevents
17280 some bugs where we would look at (but fortunately, not reveal)
17281 uninitialized memory on the stack. Fixes bug 14013; bugfix on all
17283 - Clear all memory targeted by tor_addr_{to,from}_sockaddr(), not
17284 just the part that's used. This makes it harder for data leak bugs
17285 to occur in the event of other programming failures. Resolves
17288 o Minor bugfixes (relay):
17289 - When generating our family list, remove spaces from around the
17290 entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
17291 - If our previous bandwidth estimate was 0 bytes, allow publishing a
17292 new relay descriptor immediately. Fixes bug 13000; bugfix
17295 o Minor bugfixes (shutdown):
17296 - When shutting down, always call event_del() on lingering read or
17297 write events before freeing them. Otherwise, we risk double-frees
17298 or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
17301 o Minor bugfixes (small memory leaks):
17302 - Avoid leaking memory when using IPv6 virtual address mappings.
17303 Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
17306 o Minor bugfixes (statistics):
17307 - Increase period over which bandwidth observations are aggregated
17308 from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
17310 o Minor bugfixes (systemd support):
17311 - Run correctly under systemd with the RunAsDaemon option set. Fixes
17312 part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
17313 - Inform the systemd supervisor about more changes in the Tor
17314 process status. Implements part of ticket 14141. Patch from
17317 o Minor bugfixes (testing networks):
17318 - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
17319 testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
17320 - Stop using the default authorities in networks which provide both
17321 AlternateDirAuthority and AlternateBridgeAuthority. Partially
17322 fixes bug 13163; bugfix on 0.2.0.13-alpha.
17324 o Minor bugfixes (testing networks, fast startup):
17325 - Allow Tor to build circuits using a consensus with no exits. If
17326 the consensus has no exits (typical of a bootstrapping test
17327 network), allow Tor to build circuits once enough descriptors have
17328 been downloaded. This assists in bootstrapping a testing Tor
17329 network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
17331 - When V3AuthVotingInterval is low, give a lower If-Modified-Since
17332 header to directory servers. This allows us to obtain consensuses
17333 promptly when the consensus interval is very short. This assists
17334 in bootstrapping a testing Tor network. Fixes parts of bugs 13718
17335 and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
17336 - Stop assuming that private addresses are local when checking
17337 reachability in a TestingTorNetwork. Instead, when testing, assume
17338 all OR connections are remote. (This is necessary due to many test
17339 scenarios running all relays on localhost.) This assists in
17340 bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
17341 0.1.0.1-rc. Patch by "teor".
17342 - Avoid building exit circuits from a consensus with no exits. Now
17343 thanks to our fix for 13718, we accept a no-exit network as not
17344 wholly lost, but we need to remember not to try to build exit
17345 circuits on it. Closes ticket 13814; patch by "teor".
17346 - Stop requiring exits to have non-zero bandwithcapacity in a
17347 TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
17348 ignore exit bandwidthcapacity. This assists in bootstrapping a
17349 testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
17350 on 0.2.0.3-alpha. Patch by "teor".
17351 - Add "internal" to some bootstrap statuses when no exits are
17352 available. If the consensus does not contain Exits, Tor will only
17353 build internal circuits. In this case, relevant statuses will
17354 contain the word "internal" as indicated in the Tor control-
17355 spec.txt. When bootstrap completes, Tor will be ready to build
17356 internal circuits. If a future consensus contains Exits, exit
17357 circuits may become available. Fixes part of bug 13718; bugfix on
17358 0.2.4.10-alpha. Patch by "teor".
17359 - Decrease minimum consensus interval to 10 seconds when
17360 TestingTorNetwork is set, or 5 seconds for the first consensus.
17361 Fix assumptions throughout the code that assume larger intervals.
17362 Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
17364 - Avoid excluding guards from path building in minimal test
17365 networks, when we're in a test network and excluding guards would
17366 exclude all relays. This typically occurs in incredibly small tor
17367 networks, and those using "TestingAuthVoteGuard *". Fixes part of
17368 bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
17370 o Minor bugfixes (testing):
17371 - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
17372 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
17373 - Stop spawn test failures due to a race condition between the
17374 SIGCHLD handler updating the process status, and the test reading
17375 it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
17376 - Avoid passing an extra backslash when creating a temporary
17377 directory for running the unit tests on Windows. Fixes bug 12392;
17378 bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
17380 o Minor bugfixes (TLS):
17381 - Check more thoroughly throughout the TLS code for possible
17382 unlogged TLS errors. Possible diagnostic or fix for bug 13319.
17384 o Minor bugfixes (transparent proxy):
17385 - Use getsockname, not getsockopt, to retrieve the address for a
17386 TPROXY-redirected connection. Fixes bug 13796; bugfix
17389 o Minor bugfixes (windows):
17390 - Remove code to special-case handling of NTE_BAD_KEYSET when
17391 acquiring windows CryptoAPI context. This error can't actually
17392 occur for the parameters we're providing. Fixes bug 10816; bugfix
17395 o Minor bugfixes (zlib):
17396 - Avoid truncating a zlib stream when trying to finalize it with an
17397 empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
17399 o Code simplification and refactoring:
17400 - Change the entry_is_live() function to take named bitfield
17401 elements instead of an unnamed list of booleans. Closes
17403 - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
17404 Resolves ticket 12205.
17405 - Use calloc and reallocarray functions instead of multiply-
17406 then-malloc. This makes it less likely for us to fall victim to an
17407 integer overflow attack when allocating. Resolves ticket 12855.
17408 - Use the standard macro name SIZE_MAX, instead of our
17410 - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
17411 functions which take them as arguments. Replace 0 with NO_DIRINFO
17412 in a function call for clarity. Seeks to prevent future issues
17414 - Avoid 4 null pointer errors under clang static analysis by using
17415 tor_assert() to prove that the pointers aren't null. Fixes
17417 - Rework the API of policies_parse_exit_policy() to use a bitmask to
17418 represent parsing options, instead of a confusing mess of
17419 booleans. Resolves ticket 8197.
17420 - Introduce a helper function to parse ExitPolicy in
17421 or_options_t structure.
17422 - Move fields related to isolating and configuring client ports into
17423 a shared structure. Previously, they were duplicated across
17424 port_cfg_t, listener_connection_t, and edge_connection_t. Failure
17425 to copy them correctly had been the cause of at least one bug in
17426 the past. Closes ticket 8546.
17427 - Refactor the get_interface_addresses_raw() doom-function into
17428 multiple smaller and simpler subfunctions. Cover the resulting
17429 subfunctions with unit-tests. Fixes a significant portion of
17431 - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
17432 only for version <= 0.2.2.24 which is now deprecated. Closes
17434 - Remove a test for a long-defunct broken version-one
17436 - Refactor main loop to extract the 'loop' part. This makes it
17437 easier to run Tor under Shadow. Closes ticket 15176.
17438 - Stop using can_complete_circuits as a global variable; access it
17439 with a function instead.
17440 - Avoid using operators directly as macro arguments: this lets us
17441 apply coccinelle transformations to our codebase more directly.
17442 Closes ticket 13172.
17443 - Combine the functions used to parse ClientTransportPlugin and
17444 ServerTransportPlugin into a single function. Closes ticket 6456.
17445 - Add inline functions and convenience macros for inspecting channel
17446 state. Refactor the code to use convenience macros instead of
17447 checking channel state directly. Fixes issue 7356.
17448 - Document all members of was_router_added_t and rename
17449 ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
17450 confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
17451 - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
17452 constant instead of hardcoded value. Fixes issue 13840.
17453 - Refactor our generic strmap and digestmap types into a single
17454 implementation, so that we can add a new digest256map
17458 - Add a doc/TUNING document with tips for handling large numbers of
17459 TCP connections when running busy Tor relay. Update the warning
17460 message to point to this file when running out of sockets
17461 operating system is allowing to use simultaneously. Resolves
17463 - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
17464 for writing the OpenBSD-specific tips. Resolves ticket 13702.
17465 - Make the tor-resolve documentation match its help string and its
17466 options. Resolves part of ticket 14325.
17467 - Log a more useful error message from tor-resolve when failing to
17468 look up a hidden service address. Resolves part of ticket 14325.
17469 - Document the bridge-authority-only 'networkstatus-bridges' file.
17470 Closes ticket 13713; patch from "tom".
17471 - Fix typo in PredictedPortsRelevanceTime option description in
17472 manpage. Resolves issue 13707.
17473 - Stop suggesting that users specify relays by nickname: it isn't a
17474 good idea. Also, properly cross-reference how to specify relays in
17475 all parts of manual documenting options that take a list of
17476 relays. Closes ticket 13381.
17477 - Clarify the HiddenServiceDir option description in manpage to make
17478 it clear that relative paths are taken with respect to the current
17479 working directory. Also clarify that this behavior is not
17480 guaranteed to remain indefinitely. Fixes issue 13913.
17482 o Distribution (systemd):
17483 - systemd unit file: only allow tor to write to /var/lib/tor and
17484 /var/log/tor. The rest of the filesystem is accessible for reading
17485 only. Patch by intrigeri; resolves ticket 12751.
17486 - systemd unit file: ensure that the process and all its children
17487 can never gain new privileges. Patch by intrigeri; resolves
17489 - systemd unit file: set up /var/run/tor as writable for the Tor
17490 service. Patch by intrigeri; resolves ticket 13196.
17492 o Downgraded warnings:
17493 - Don't warn when we've attempted to contact a relay using the wrong
17494 ntor onion key. Closes ticket 9635.
17497 - Remove some lingering dead code that once supported mempools.
17498 Mempools were disabled by default in 0.2.5, and removed entirely
17499 in 0.2.6.3-alpha. Closes more of ticket 14848; patch
17502 o Removed features (directory authorities):
17503 - Remove code that prevented authorities from listing Tor relays
17504 affected by CVE-2011-2769 as guards. These relays are already
17505 rejected altogether due to the minimum version requirement of
17506 0.2.3.16-alpha. Closes ticket 13152.
17507 - The "AuthDirRejectUnlisted" option no longer has any effect, as
17508 the fingerprints file (approved-routers) has been deprecated.
17509 - Directory authorities do not support being Naming dirauths anymore.
17510 The "NamingAuthoritativeDir" config option is now obsolete.
17511 - Directory authorities do not support giving out the BadDirectory
17513 - Directory authorities no longer advertise or support consensus
17514 methods 1 through 12 inclusive. These consensus methods were
17515 obsolete and/or insecure: maintaining the ability to support them
17516 served no good purpose. Implements part of proposal 215; closes
17519 o Removed features:
17520 - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
17521 longer silently accepted as an alias for "ExitNodes".
17522 - The --enable-mempool and --enable-buf-freelists options, which
17523 were originally created to work around bad malloc implementations,
17524 no longer exist. They were off-by-default in 0.2.5. Closes
17526 - We no longer remind the user about configuration options that have
17527 been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
17528 - Remove our old, non-weighted bandwidth-based node selection code.
17529 Previously, we used it as a fallback when we couldn't perform
17530 weighted bandwidth-based node selection. But that would only
17531 happen in the cases where we had no consensus, or when we had a
17532 consensus generated by buggy or ancient directory authorities. In
17533 either case, it's better to use the more modern, better maintained
17534 algorithm, with reasonable defaults for the weights. Closes
17536 - Remove the --disable-curve25519 configure option. Relays and
17537 clients now are required to support curve25519 and the
17539 - The old "StrictEntryNodes" and "StrictExitNodes" options, which
17540 used to be deprecated synonyms for "StrictNodes", are now marked
17541 obsolete. Resolves ticket 12226.
17542 - Clients don't understand the BadDirectory flag in the consensus
17543 anymore, and ignore it.
17545 o Removed platform support:
17546 - We no longer include special code to build on Windows CE; as far
17547 as we know, nobody has used Tor on Windows CE in a very long time.
17548 Closes ticket 11446.
17550 o Testing (test-network.sh):
17551 - Stop using "echo -n", as some shells' built-in echo doesn't
17552 support "-n". Instead, use "/bin/echo -n". Partially fixes
17554 - Stop an apparent test-network hang when used with make -j2. Fixes
17556 - Add a --delay option to test-network.sh, which configures the
17557 delay before the chutney network tests for data transmission.
17558 Partially implements ticket 13161.
17561 - Test that tor does not fail when key files are zero-length. Check
17562 that tor generates new keys, and overwrites the empty key files.
17563 - Test that tor generates new keys when keys are missing
17564 (existing behavior).
17565 - Test that tor does not overwrite key files that already contain
17566 data (existing behavior). Tests bug 13111. Patch by "teor".
17567 - New "make test-stem" target to run stem integration tests.
17568 Requires that the "STEM_SOURCE_DIR" environment variable be set.
17569 Closes ticket 14107.
17570 - Make the test_cmdline_args.py script work correctly on Windows.
17571 Patch from Gisle Vanem.
17572 - Move the slower unit tests into a new "./src/test/test-slow"
17573 binary that can be run independently of the other tests. Closes
17575 - New tests for many parts of channel, relay, and circuitmux
17576 functionality. Code by Andrea; part of 9262.
17577 - New tests for parse_transport_line(). Part of ticket 6456.
17578 - In the unit tests, use chgrp() to change the group of the unit
17579 test temporary directory to the current user, so that the sticky
17580 bit doesn't interfere with tests that check directory groups.
17582 - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
17584 - Refactor the function that chooses guard nodes so that it can more
17585 easily be tested; write some tests for it.
17586 - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
17587 bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
17588 - Create unit tests for format_time_interval(). With bug 13393.
17589 - Add unit tests for tor_timegm signed overflow, tor_timegm and
17590 parse_rfc1123_time validity checks, correct_tm year clamping. Unit
17591 tests (visible) fixes in bug 13476.
17592 - Add a "coverage-html" make target to generate HTML-visualized
17593 coverage results when building with --enable-coverage. (Requires
17594 lcov.) Patch from Kevin Murray.
17595 - Enable the backtrace handler (where supported) when running the
17597 - Revise all unit tests that used the legacy test_* macros to
17598 instead use the recommended tt_* macros. This patch was generated
17599 with coccinelle, to avoid manual errors. Closes ticket 13119.
17601 Changes in version 0.2.5.11 - 2015-03-17
17602 Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
17604 It backports several bugfixes from the 0.2.6 branch, including a
17605 couple of medium-level security fixes for relays and exit nodes.
17606 It also updates the list of directory authorities.
17608 o Directory authority changes:
17609 - Remove turtles as a directory authority.
17610 - Add longclaw as a new (v3) directory authority. This implements
17611 ticket 13296. This keeps the directory authority count at 9.
17612 - The directory authority Faravahar has a new IP address. This
17613 closes ticket 14487.
17615 o Major bugfixes (crash, OSX, security):
17616 - Fix a remote denial-of-service opportunity caused by a bug in
17617 OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
17620 o Major bugfixes (relay, stability, possible security):
17621 - Fix a bug that could lead to a relay crashing with an assertion
17622 failure if a buffer of exactly the wrong layout was passed to
17623 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
17624 0.2.0.10-alpha. Patch from 'cypherpunks'.
17625 - Do not assert if the 'data' pointer on a buffer is advanced to the
17626 very end of the buffer; log a BUG message instead. Only assert if
17627 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
17629 o Major bugfixes (exit node stability):
17630 - Fix an assertion failure that could occur under high DNS load.
17631 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
17632 diagnosed and fixed by "cypherpunks".
17634 o Major bugfixes (Linux seccomp2 sandbox):
17635 - Upon receiving sighup with the seccomp2 sandbox enabled, do not
17636 crash during attempts to call wait4. Fixes bug 15088; bugfix on
17637 0.2.5.1-alpha. Patch from "sanic".
17639 o Minor features (controller):
17640 - New "GETINFO bw-event-cache" to get information about recent
17641 bandwidth events. Closes ticket 14128. Useful for controllers to
17642 get recent bandwidth history after the fix for ticket 13988.
17644 o Minor features (geoip):
17645 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
17646 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
17649 o Minor bugfixes (client, automapping):
17650 - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
17651 no value follows the option. Fixes bug 14142; bugfix on
17652 0.2.4.7-alpha. Patch by "teor".
17653 - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
17654 14195; bugfix on 0.1.0.1-rc.
17656 o Minor bugfixes (compilation):
17657 - Build without warnings with the stock OpenSSL srtp.h header, which
17658 has a duplicate declaration of SSL_get_selected_srtp_profile().
17659 Fixes bug 14220; this is OpenSSL's bug, not ours.
17661 o Minor bugfixes (directory authority):
17662 - Allow directory authorities to fetch more data from one another if
17663 they find themselves missing lots of votes. Previously, they had
17664 been bumping against the 10 MB queued data limit. Fixes bug 14261;
17665 bugfix on 0.1.2.5-alpha.
17666 - Enlarge the buffer to read bwauth generated files to avoid an
17667 issue when parsing the file in dirserv_read_measured_bandwidths().
17668 Fixes bug 14125; bugfix on 0.2.2.1-alpha.
17670 o Minor bugfixes (statistics):
17671 - Increase period over which bandwidth observations are aggregated
17672 from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
17674 o Minor bugfixes (preventative security, C safety):
17675 - When reading a hexadecimal, base-32, or base-64 encoded value from
17676 a string, always overwrite the whole output buffer. This prevents
17677 some bugs where we would look at (but fortunately, not reveal)
17678 uninitialized memory on the stack. Fixes bug 14013; bugfix on all
17682 Changes in version 0.2.4.26 - 2015-03-17
17683 Tor 0.2.4.26 includes an updated list of directory authorities. It
17684 also backports a couple of stability and security bugfixes from 0.2.5
17687 o Directory authority changes:
17688 - Remove turtles as a directory authority.
17689 - Add longclaw as a new (v3) directory authority. This implements
17690 ticket 13296. This keeps the directory authority count at 9.
17691 - The directory authority Faravahar has a new IP address. This
17692 closes ticket 14487.
17694 o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
17695 - Fix an assertion failure that could occur under high DNS load.
17696 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
17697 diagnosed and fixed by "cypherpunks".
17699 o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
17700 - Fix a bug that could lead to a relay crashing with an assertion
17701 failure if a buffer of exactly the wrong layout was passed to
17702 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
17703 0.2.0.10-alpha. Patch from 'cypherpunks'.
17704 - Do not assert if the 'data' pointer on a buffer is advanced to the
17705 very end of the buffer; log a BUG message instead. Only assert if
17706 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
17708 o Minor features (geoip):
17709 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
17710 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
17713 Changes in version 0.2.5.10 - 2014-10-24
17714 Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
17716 It adds several new security features, including improved
17717 denial-of-service resistance for relays, new compiler hardening
17718 options, and a system-call sandbox for hardened installations on Linux
17719 (requires seccomp2). The controller protocol has several new features,
17720 resolving IPv6 addresses should work better than before, and relays
17721 should be a little more CPU-efficient. We've added support for more
17722 OpenBSD and FreeBSD transparent proxy types. We've improved the build
17723 system and testing infrastructure to allow unit testing of more parts
17724 of the Tor codebase. Finally, we've addressed several nagging pluggable
17725 transport usability issues, and included numerous other small bugfixes
17726 and features mentioned below.
17728 This release marks end-of-life for Tor 0.2.3.x; those Tor versions
17729 have accumulated many known flaws; everyone should upgrade.
17731 o Major features (security):
17732 - The ntor handshake is now on-by-default, no matter what the
17733 directory authorities recommend. Implements ticket 8561.
17734 - Make the "tor-gencert" tool used by directory authority operators
17735 create 2048-bit signing keys by default (rather than 1024-bit, since
17736 1024-bit is uncomfortably small these days). Addresses ticket 10324.
17737 - Warn about attempts to run hidden services and relays in the same
17738 process: that's probably not a good idea. Closes ticket 12908.
17739 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
17740 today support TLS 1.0 or later, so we can safely turn off support
17741 for this old (and insecure) protocol. Fixes bug 13426.
17743 o Major features (relay security, DoS-resistance):
17744 - When deciding whether we have run out of memory and we need to
17745 close circuits, also consider memory allocated in buffers for
17746 streams attached to each circuit.
17748 This change, which extends an anti-DoS feature introduced in
17749 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
17750 better resist more memory-based DoS attacks than before. Since the
17751 MaxMemInCellQueues option now applies to all queues, it is renamed
17752 to MaxMemInQueues. This feature fixes bug 10169.
17753 - Avoid hash-flooding denial-of-service attacks by using the secure
17754 SipHash-2-4 hash function for our hashtables. Without this
17755 feature, an attacker could degrade performance of a targeted
17756 client or server by flooding their data structures with a large
17757 number of entries to be stored at the same hash table position,
17758 thereby slowing down the Tor instance. With this feature, hash
17759 table positions are derived from a randomized cryptographic key,
17760 and an attacker cannot predict which entries will collide. Closes
17762 - If you don't specify MaxMemInQueues yourself, Tor now tries to
17763 pick a good value based on your total system memory. Previously,
17764 the default was always 8 GB. You can still override the default by
17765 setting MaxMemInQueues yourself. Resolves ticket 11396.
17767 o Major features (bridges and pluggable transports):
17768 - Add support for passing arguments to managed pluggable transport
17769 proxies. Implements ticket 3594.
17770 - Bridges now track GeoIP information and the number of their users
17771 even when pluggable transports are in use, and report usage
17772 statistics in their extra-info descriptors. Resolves tickets 4773
17774 - Don't launch pluggable transport proxies if we don't have any
17775 bridges configured that would use them. Now we can list many
17776 pluggable transports, and Tor will dynamically start one when it
17777 hears a bridge address that needs it. Resolves ticket 5018.
17778 - The bridge directory authority now assigns status flags (Stable,
17779 Guard, etc) to bridges based on thresholds calculated over all
17780 Running bridges. Now bridgedb can finally make use of its features
17781 to e.g. include at least one Stable bridge in its answers. Fixes
17784 o Major features (controller):
17785 - Extend ORCONN controller event to include an "ID" parameter,
17786 and add four new controller event types CONN_BW, CIRC_BW,
17787 CELL_STATS, and TB_EMPTY that show connection and circuit usage.
17788 The new events are emitted in private Tor networks only, with the
17789 goal of being able to better track performance and load during
17790 full-network simulations. Implements proposal 218 and ticket 7359.
17792 o Major features (relay performance):
17793 - Speed up server-side lookups of rendezvous and introduction point
17794 circuits by using hashtables instead of linear searches. These
17795 functions previously accounted between 3 and 7% of CPU usage on
17796 some busy relays. Resolves ticket 9841.
17797 - Avoid wasting CPU when extending a circuit over a channel that is
17798 nearly out of circuit IDs. Previously, we would do a linear scan
17799 over possible circuit IDs before finding one or deciding that we
17800 had exhausted our possibilities. Now, we try at most 64 random
17801 circuit IDs before deciding that we probably won't succeed. Fixes
17802 a possible root cause of ticket 11553.
17804 o Major features (seccomp2 sandbox, Linux only):
17805 - Use the seccomp2 syscall filtering facility on Linux to limit
17806 which system calls Tor can invoke. This is an experimental,
17807 Linux-only feature to provide defense-in-depth against unknown
17808 attacks. To try turning it on, set "Sandbox 1" in your torrc
17809 file. Please be ready to report bugs. We hope to add support
17810 for better sandboxing in the future, including more fine-grained
17811 filters, better division of responsibility, and support for more
17812 platforms. This work has been done by Cristian-Matei Toader for
17813 Google Summer of Code. Resolves tickets 11351 and 11465.
17815 o Major features (testing networks):
17816 - Make testing Tor networks bootstrap better: lower directory fetch
17817 retry schedules and maximum interval without directory requests,
17818 and raise maximum download tries. Implements ticket 6752.
17819 - Add make target 'test-network' to run tests on a Chutney network.
17820 Implements ticket 8530.
17822 o Major features (other):
17823 - On some platforms (currently: recent OSX versions, glibc-based
17824 platforms that support the ELF format, and a few other
17825 Unix-like operating systems), Tor can now dump stack traces
17826 when a crash occurs or an assertion fails. By default, traces
17827 are dumped to stderr (if possible) and to any logs that are
17828 reporting errors. Implements ticket 9299.
17830 o Deprecated versions:
17831 - Tor 0.2.3.x has reached end-of-life; it has received no patches or
17832 attention for some while.
17834 o Major bugfixes (security, directory authorities):
17835 - Directory authorities now include a digest of each relay's
17836 identity key as a part of its microdescriptor.
17838 This is a workaround for bug 11743 (reported by "cypherpunks"),
17839 where Tor clients do not support receiving multiple
17840 microdescriptors with the same SHA256 digest in the same
17841 consensus. When clients receive a consensus like this, they only
17842 use one of the relays. Without this fix, a hostile relay could
17843 selectively disable some client use of target relays by
17844 constructing a router descriptor with a different identity and the
17845 same microdescriptor parameters and getting the authorities to
17846 list it in a microdescriptor consensus. This fix prevents an
17847 attacker from causing a microdescriptor collision, because the
17848 router's identity is not forgeable.
17850 o Major bugfixes (openssl bug workaround):
17851 - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
17852 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
17853 bug 13471. This is a workaround for an OpenSSL bug.
17855 o Major bugfixes (client):
17856 - Perform circuit cleanup operations even when circuit
17857 construction operations are disabled (because the network is
17858 disabled, or because there isn't enough directory information).
17859 Previously, when we were not building predictive circuits, we
17860 were not closing expired circuits either. Fixes bug 8387; bugfix on
17861 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
17862 became more strict about when we have "enough directory information
17863 to build circuits".
17865 o Major bugfixes (client, pluggable transports):
17866 - When managing pluggable transports, use OS notification facilities
17867 to learn if they have crashed, and don't attempt to kill any
17868 process that has already exited. Fixes bug 8746; bugfix
17871 o Major bugfixes (relay denial of service):
17872 - Instead of writing destroy cells directly to outgoing connection
17873 buffers, queue them and intersperse them with other outgoing cells.
17874 This can prevent a set of resource starvation conditions where too
17875 many pending destroy cells prevent data cells from actually getting
17876 delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
17877 bugfix on 0.2.0.1-alpha.
17879 o Major bugfixes (relay):
17880 - Avoid queuing or sending destroy cells for circuit ID zero when we
17881 fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
17882 Found and fixed by "cypherpunks".
17883 - Fix ORPort reachability detection on relays running behind a
17884 proxy, by correctly updating the "local" mark on the controlling
17885 channel when changing the address of an or_connection_t after the
17886 handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
17887 - Use a direct dirport connection when uploading non-anonymous
17888 descriptors to the directory authorities. Previously, relays would
17889 incorrectly use tunnel connections under a fairly wide variety of
17890 circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
17891 - When a circuit accidentally has the same circuit ID for its
17892 forward and reverse direction, correctly detect the direction of
17893 cells using that circuit. Previously, this bug made roughly one
17894 circuit in a million non-functional. Fixes bug 12195; this is a
17895 bugfix on every version of Tor.
17897 o Minor features (security):
17898 - New --enable-expensive-hardening option to enable security
17899 hardening options that consume nontrivial amounts of CPU and
17900 memory. Right now, this includes AddressSanitizer and UbSan, which
17901 are supported in newer versions of GCC and Clang. Closes ticket
17903 - Authorities now assign the Guard flag to the fastest 25% of the
17904 network (it used to be the fastest 50%). Also raise the consensus
17905 weight that guarantees the Guard flag from 250 to 2000. For the
17906 current network, this results in about 1100 guards, down from 2500.
17907 This step paves the way for moving the number of entry guards
17908 down to 1 (proposal 236) while still providing reasonable expected
17909 performance for most users. Implements ticket 12690.
17911 o Minor features (security, memory management):
17912 - Memory allocation tricks (mempools and buffer freelists) are now
17913 disabled by default. You can turn them back on with
17914 --enable-mempools and --enable-buf-freelists respectively. We're
17915 disabling these features because malloc performance is good enough
17916 on most platforms, and a similar feature in OpenSSL exacerbated
17917 exploitation of the Heartbleed attack. Resolves ticket 11476.
17919 o Minor features (bridge client):
17920 - Report a more useful failure message when we can't connect to a
17921 bridge because we don't have the right pluggable transport
17922 configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
17924 o Minor features (bridge):
17925 - Add an ExtORPortCookieAuthFileGroupReadable option to make the
17926 cookie file for the ExtORPort g+r by default.
17928 o Minor features (bridges, pluggable transports):
17929 - Bridges now write the SHA1 digest of their identity key
17930 fingerprint (that is, a hash of a hash of their public key) to
17931 notice-level logs, and to a new hashed-fingerprint file. This
17932 information will help bridge operators look up their bridge in
17933 Globe and similar tools. Resolves ticket 10884.
17934 - Improve the message that Tor displays when running as a bridge
17935 using pluggable transports without an Extended ORPort listener.
17936 Also, log the message in the log file too. Resolves ticket 11043.
17937 - Add threshold cutoffs to the networkstatus document created by
17938 the Bridge Authority. Fixes bug 1117.
17939 - On Windows, spawn background processes using the CREATE_NO_WINDOW
17940 flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
17941 doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
17942 Vidalia set this option for us.) Implements ticket 10297.
17944 o Minor features (build):
17945 - The configure script has a --disable-seccomp option to turn off
17946 support for libseccomp on systems that have it, in case it (or
17947 Tor's use of it) is broken. Resolves ticket 11628.
17948 - Assume that a user using ./configure --host wants to cross-compile,
17949 and give an error if we cannot find a properly named
17950 tool-chain. Add a --disable-tool-name-check option to proceed
17951 nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
17952 - If we run ./configure and the compiler recognizes -fstack-protector
17953 but the linker rejects it, warn the user about a potentially missing
17954 libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
17955 - Add support for `--library-versions` flag. Implements ticket 6384.
17956 - Return the "unexpected sendme" warnings to a warn severity, but make
17957 them rate limited, to help diagnose ticket 8093.
17958 - Detect a missing asciidoc, and warn the user about it, during
17959 configure rather than at build time. Fixes issue 6506. Patch from
17962 o Minor features (client):
17963 - Add a new option, PredictedPortsRelevanceTime, to control how long
17964 after having received a request to connect to a given port Tor
17965 will try to keep circuits ready in anticipation of future requests
17966 for that port. Patch from "unixninja92"; implements ticket 9176.
17968 o Minor features (config options and command line):
17969 - Add an --allow-missing-torrc commandline option that tells Tor to
17970 run even if the configuration file specified by -f is not available.
17971 Implements ticket 10060.
17972 - Add support for the TPROXY transparent proxying facility on Linux.
17973 See documentation for the new TransProxyType option for more
17974 details. Implementation by "thomo". Closes ticket 10582.
17976 o Minor features (config options):
17977 - Config (torrc) lines now handle fingerprints which are missing
17978 their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
17979 - Support a --dump-config option to print some or all of the
17980 configured options. Mainly useful for debugging the command-line
17981 option parsing code. Helps resolve ticket 4647.
17982 - Raise awareness of safer logging: notify user of potentially
17983 unsafe config options, like logging more verbosely than severity
17984 "notice" or setting SafeLogging to 0. Resolves ticket 5584.
17985 - Add a new configuration option TestingV3AuthVotingStartOffset
17986 that bootstraps a network faster by changing the timing for
17987 consensus votes. Addresses ticket 8532.
17988 - Add a new torrc option "ServerTransportOptions" that allows
17989 bridge operators to pass configuration parameters to their
17990 pluggable transports. Resolves ticket 8929.
17991 - The config (torrc) file now accepts bandwidth and space limits in
17992 bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
17993 you can now say "16 kilobits", and so on.) Resolves ticket 9214.
17996 o Minor features (controller):
17997 - Make the entire exit policy available from the control port via
17998 GETINFO exit-policy/*. Implements enhancement 7952. Patch from
18000 - Because of the fix for ticket 11396, the real limit for memory
18001 usage may no longer match the configured MaxMemInQueues value. The
18002 real limit is now exposed via GETINFO limits/max-mem-in-queues.
18003 - Add a new "HS_DESC" controller event that reports activities
18004 related to hidden service descriptors. Resolves ticket 8510.
18005 - New "DROPGUARDS" controller command to forget all current entry
18006 guards. Not recommended for ordinary use, since replacing guards
18007 too frequently makes several attacks easier. Resolves ticket 9934;
18009 - Implement the TRANSPORT_LAUNCHED control port event that
18010 notifies controllers about new launched pluggable
18011 transports. Resolves ticket 5609.
18013 o Minor features (diagnostic):
18014 - When logging a warning because of bug 7164, additionally check the
18015 hash table for consistency (as proposed on ticket 11737). This may
18016 help diagnose bug 7164.
18017 - When we log a heartbeat, log how many one-hop circuits we have
18018 that are at least 30 minutes old, and log status information about
18019 a few of them. This is an attempt to track down bug 8387.
18020 - When encountering an unexpected CR while writing text to a file on
18021 Windows, log the name of the file. Should help diagnosing
18023 - Give more specific warnings when a client notices that an onion
18024 handshake has failed. Fixes ticket 9635.
18025 - Add significant new logging code to attempt to diagnose bug 12184,
18026 where relays seem to run out of available circuit IDs.
18027 - Improve the diagnostic log message for bug 8387 even further to
18028 try to improve our odds of figuring out why one-hop directory
18029 circuits sometimes do not get closed.
18030 - Add more log messages to diagnose bug 7164, which causes
18031 intermittent "microdesc_free() called but md was still referenced"
18032 warnings. We now include more information, to figure out why we
18033 might be cleaning a microdescriptor for being too old if it's
18034 still referenced by a live node_t object.
18035 - Log current accounting state (bytes sent and received + remaining
18036 time for the current accounting period) in the relay's heartbeat
18037 message. Implements ticket 5526; patch from Peter Retzlaff.
18039 o Minor features (geoip):
18040 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
18043 o Minor features (interface):
18044 - Generate a warning if any ports are listed in the SocksPolicy,
18045 DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
18046 AuthDirBadExit options. (These options only support address
18047 ranges.) Fixes part of ticket 11108.
18049 o Minor features (kernel API usage):
18050 - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
18051 sockets in a single system call. Implements ticket 5129.
18053 o Minor features (log messages):
18054 - When ServerTransportPlugin is set on a bridge, Tor can write more
18055 useful statistics about bridge use in its extrainfo descriptors,
18056 but only if the Extended ORPort ("ExtORPort") is set too. Add a
18057 log message to inform the user in this case. Resolves ticket 9651.
18058 - When receiving a new controller connection, log the origin address.
18059 Resolves ticket 9698; patch from "sigpipe".
18060 - When logging OpenSSL engine status at startup, log the status of
18061 more engines. Fixes ticket 10043; patch from Joshua Datko.
18063 o Minor features (log verbosity):
18064 - Demote the message that we give when a flushing connection times
18065 out for too long from NOTICE to INFO. It was usually meaningless.
18066 Resolves ticket 5286.
18067 - Don't log so many notice-level bootstrapping messages at startup
18068 about downloading descriptors. Previously, we'd log a notice
18069 whenever we learned about more routers. Now, we only log a notice
18070 at every 5% of progress. Fixes bug 9963.
18071 - Warn less verbosely when receiving a malformed
18072 ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
18074 o Minor features (performance):
18075 - If we're using the pure-C 32-bit curve25519_donna implementation
18076 of curve25519, build it with the -fomit-frame-pointer option to
18077 make it go faster on register-starved hosts. This improves our
18078 handshake performance by about 6% on i386 hosts without nacl.
18079 Closes ticket 8109.
18081 o Minor features (relay):
18082 - If a circuit timed out for at least 3 minutes, check if we have a
18083 new external IP address, and publish a new descriptor with the new
18084 IP address if it changed. Resolves ticket 2454.
18086 o Minor features (testing):
18087 - If Python is installed, "make check" now runs extra tests beyond
18088 the unit test scripts.
18089 - When bootstrapping a test network, sometimes very few relays get
18090 the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
18091 specify a set of relays which should be voted Guard regardless of
18092 their uptime or bandwidth. Addresses ticket 9206.
18094 o Minor features (transparent proxy, *BSD):
18095 - Support FreeBSD's ipfw firewall interface for TransPort ports on
18096 FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
18097 10267; patch from "yurivict".
18098 - Support OpenBSD's divert-to rules with the pf firewall for
18099 transparent proxy ports. To enable it, set "TransProxyType
18100 pf-divert". This allows Tor to run a TransPort transparent proxy
18101 port on OpenBSD 4.4 or later without root privileges. See the
18102 pf.conf(5) manual page for information on configuring pf to use
18103 divert-to rules. Closes ticket 10896; patch from Dana Koch.
18105 o Minor bugfixes (bridge client):
18106 - Stop accepting bridge lines containing hostnames. Doing so would
18107 cause clients to perform DNS requests on the hostnames, which was
18108 not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
18110 o Minor bugfixes (bridges):
18111 - Avoid potential crashes or bad behavior when launching a
18112 server-side managed proxy with ORPort or ExtORPort temporarily
18113 disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
18114 - Fix a bug where the first connection works to a bridge that uses a
18115 pluggable transport with client-side parameters, but we don't send
18116 the client-side parameters on subsequent connections. (We don't
18117 use any pluggable transports with client-side parameters yet,
18118 but ScrambleSuit will soon become the first one.) Fixes bug 9162;
18119 bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
18121 o Minor bugfixes (build, auxiliary programs):
18122 - Stop preprocessing the "torify" script with autoconf, since
18123 it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
18125 - The tor-fw-helper program now follows the standard convention and
18126 exits with status code "0" on success. Fixes bug 9030; bugfix on
18127 0.2.3.1-alpha. Patch by Arlo Breault.
18128 - Corrected ./configure advice for what openssl dev package you should
18129 install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
18131 o Minor bugfixes (client):
18132 - Avoid "Tried to open a socket with DisableNetwork set" warnings
18133 when starting a client with bridges configured and DisableNetwork
18134 set. (Tor launcher starts Tor with DisableNetwork set the first
18135 time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
18136 - Improve the log message when we can't connect to a hidden service
18137 because all of the hidden service directory nodes hosting its
18138 descriptor are excluded. Improves on our fix for bug 10722, which
18139 was a bugfix on 0.2.0.10-alpha.
18140 - Raise a control port warning when we fail to connect to all of
18141 our bridges. Previously, we didn't inform the controller, and
18142 the bootstrap process would stall. Fixes bug 11069; bugfix on
18144 - Exit immediately when a process-owning controller exits.
18145 Previously, tor relays would wait for a little while after their
18146 controller exited, as if they had gotten an INT signal -- but this
18147 was problematic, since there was no feedback for the user. To do a
18148 clean shutdown, controllers should send an INT signal and give Tor
18149 a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
18150 - Stop attempting to connect to bridges before our pluggable
18151 transports are configured (harmless but resulted in some erroneous
18152 log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
18153 - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
18154 generating incorrect SOCKS5 responses, and confusing client
18155 applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
18157 o Minor bugfixes (client, DNSPort):
18158 - When using DNSPort, try to respond to AAAA requests with AAAA
18159 answers. Previously, we hadn't looked at the request type when
18160 deciding which answer type to prefer. Fixes bug 10468; bugfix on
18162 - When receiving a DNS query for an unsupported record type, reply
18163 with no answer rather than with a NOTIMPL error. This behavior
18164 isn't correct either, but it will break fewer client programs, we
18165 hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
18168 o Minor bugfixes (client, logging during bootstrap):
18169 - Only report the first fatal bootstrap error on a given OR
18170 connection. This stops us from telling the controller bogus error
18171 messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
18172 - Avoid generating spurious warnings when starting with
18173 DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
18176 o Minor bugfixes (closing OR connections):
18177 - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
18178 check if it's an or_connection_t and correctly call
18179 connection_or_close_for_error() rather than
18180 connection_mark_for_close() directly. Fixes bug 11304; bugfix on
18182 - When closing all connections on setting DisableNetwork to 1, use
18183 connection_or_close_normally() rather than closing OR connections
18184 out from under the channel layer. Fixes bug 11306; bugfix on
18187 o Minor bugfixes (code correctness):
18188 - Previously we used two temporary files when writing descriptors to
18189 disk; now we only use one. Fixes bug 1376.
18190 - Remove an erroneous (but impossible and thus harmless) pointer
18191 comparison that would have allowed compilers to skip a bounds
18192 check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
18193 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
18194 - Fix an always-true assertion in pluggable transports code so it
18195 actually checks what it was trying to check. Fixes bug 10046;
18196 bugfix on 0.2.3.9-alpha. Found by "dcb".
18198 o Minor bugfixes (command line):
18199 - Use a single command-line parser for parsing torrc options on the
18200 command line and for finding special command-line options to avoid
18201 inconsistent behavior for torrc option arguments that have the same
18202 names as command-line options. Fixes bugs 4647 and 9578; bugfix on
18204 - No longer allow 'tor --hash-password' with no arguments. Fixes bug
18205 9573; bugfix on 0.0.9pre5.
18207 o Minor bugfixes (compilation):
18208 - Compile correctly with builds and forks of OpenSSL (such as
18209 LibreSSL) that disable compression. Fixes bug 12602; bugfix on
18210 0.2.1.1-alpha. Patch from "dhill".
18211 - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
18212 turned off (that is, without support for v2 link handshakes). Fixes
18213 bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
18214 - In routerlist_assert_ok(), don't take the address of a
18215 routerinfo's cache_info member unless that routerinfo is non-NULL.
18216 Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
18217 - Fix a large number of false positive warnings from the clang
18218 analyzer static analysis tool. This should make real warnings
18219 easier for clang analyzer to find. Patch from "teor". Closes
18221 - Resolve GCC complaints on OpenBSD about discarding constness in
18222 TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
18223 on 0.1.1.23. Patch from Dana Koch.
18224 - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
18225 treatment of long and time_t as comparable types. Fixes part of
18226 bug 11633. Patch from Dana Koch.
18227 - When deciding whether to build the 64-bit curve25519
18228 implementation, detect platforms where we can compile 128-bit
18229 arithmetic but cannot link it. Fixes bug 11729; bugfix on
18230 0.2.4.8-alpha. Patch from "conradev".
18231 - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
18232 bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
18233 - Fix compilation with dmalloc. Fixes bug 11605; bugfix
18235 - Build and run correctly on systems like OpenBSD-current that have
18236 patched OpenSSL to remove get_cipher_by_char and/or its
18237 implementations. Fixes issue 13325.
18239 o Minor bugfixes (controller and command-line):
18240 - If changing a config option via "setconf" fails in a recoverable
18241 way, we used to nonetheless write our new control ports to the
18242 file described by the "ControlPortWriteToFile" option. Now we only
18243 write out that file if we successfully switch to the new config
18244 option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
18246 o Minor bugfixes (directory server):
18247 - No longer accept malformed http headers when parsing urls from
18248 headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
18249 bugfix on 0.0.6pre1.
18250 - When sending a compressed set of descriptors or microdescriptors,
18251 make sure to finalize the zlib stream. Previously, we would write
18252 all the compressed data, but if the last descriptor we wanted to
18253 send was missing or too old, we would not mark the stream as
18254 finished. This caused problems for decompression tools. Fixes bug
18255 11648; bugfix on 0.1.1.23.
18257 o Minor bugfixes (hidden service):
18258 - Only retry attempts to connect to a chosen rendezvous point 8
18259 times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
18261 o Minor bugfixes (interface):
18262 - Reject relative control socket paths and emit a warning. Previously,
18263 single-component control socket paths would be rejected, but Tor
18264 would not log why it could not validate the config. Fixes bug 9258;
18265 bugfix on 0.2.3.16-alpha.
18267 o Minor bugfixes (log messages):
18268 - Fix a bug where clients using bridges would report themselves
18269 as 50% bootstrapped even without a live consensus document.
18270 Fixes bug 9922; bugfix on 0.2.1.1-alpha.
18271 - Suppress a warning where, if there's only one directory authority
18272 in the network, we would complain that votes and signatures cannot
18273 be uploaded to other directory authorities. Fixes bug 10842;
18274 bugfix on 0.2.2.26-beta.
18275 - Report bootstrapping progress correctly when we're downloading
18276 microdescriptors. We had updated our "do we have enough microdescs
18277 to begin building circuits?" logic most recently in 0.2.4.10-alpha
18278 (see bug 5956), but we left the bootstrap status event logic at
18279 "how far through getting 1/4 of them are we?" Fixes bug 9958;
18280 bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
18282 o Minor bugfixes (logging):
18283 - Downgrade "Unexpected onionskin length after decryption" warning
18284 to a protocol-warn, since there's nothing relay operators can do
18285 about a client that sends them a malformed create cell. Resolves
18286 bug 12996; bugfix on 0.0.6rc1.
18287 - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
18288 cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
18289 - When logging information about an EXTEND2 or EXTENDED2 cell, log
18290 their names correctly. Fixes part of bug 12700; bugfix
18292 - When logging information about a relay cell whose command we don't
18293 recognize, log its command as an integer. Fixes part of bug 12700;
18294 bugfix on 0.2.1.10-alpha.
18295 - Escape all strings from the directory connection before logging
18296 them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
18297 - Squelch a spurious LD_BUG message "No origin circuit for
18298 successful SOCKS stream" in certain hidden service failure cases;
18300 - Downgrade the severity of the 'unexpected sendme cell from client'
18301 from 'warn' to 'protocol warning'. Closes ticket 8093.
18303 o Minor bugfixes (misc code correctness):
18304 - In munge_extrainfo_into_routerinfo(), check the return value of
18305 memchr(). This would have been a serious issue if we ever passed
18306 it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
18308 - On the chance that somebody manages to build Tor on a
18309 platform where time_t is unsigned, correct the way that
18310 microdesc_add_to_cache() handles negative time arguments.
18311 Fixes bug 8042; bugfix on 0.2.3.1-alpha.
18312 - Fix various instances of undefined behavior in channeltls.c,
18313 tor_memmem(), and eventdns.c that would cause us to construct
18314 pointers to memory outside an allocated object. (These invalid
18315 pointers were not accessed, but C does not even allow them to
18316 exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
18317 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
18318 - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
18319 fix some miscellaneous errors in our tests and codebase. Fixes bug
18320 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
18321 - Always check return values for unlink, munmap, UnmapViewOfFile;
18322 check strftime return values more often. In some cases all we can
18323 do is report a warning, but this may help prevent deeper bugs from
18324 going unnoticed. Closes ticket 8787; bugfixes on many, many tor
18326 - Fix numerous warnings from the clang "scan-build" static analyzer.
18327 Some of these are programming style issues; some of them are false
18328 positives that indicated awkward code; some are undefined behavior
18329 cases related to constructing (but not using) invalid pointers;
18330 some are assumptions about API behavior; some are (harmlessly)
18331 logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
18332 correct; and one or two are genuine bugs that weren't reachable
18333 from the rest of the program. Fixes bug 8793; bugfixes on many,
18336 o Minor bugfixes (node selection):
18337 - If ExcludeNodes is set, consider non-excluded hidden service
18338 directory servers before excluded ones. Do not consider excluded
18339 hidden service directory servers at all if StrictNodes is
18340 set. (Previously, we would sometimes decide to connect to those
18341 servers, and then realize before we initiated a connection that
18342 we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
18343 Reported by "mr-4".
18344 - If we set the ExitNodes option but it doesn't include any nodes
18345 that have the Exit flag, we would choose not to bootstrap. Now we
18346 bootstrap so long as ExitNodes includes nodes which can exit to
18347 some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
18349 o Minor bugfixes (performance):
18350 - Avoid a bug where every successful connection made us recompute
18351 the flag telling us whether we have sufficient information to
18352 build circuits. Previously, we would forget our cached value
18353 whenever we successfully opened a channel (or marked a router as
18354 running or not running for any other reason), regardless of
18355 whether we had previously believed the router to be running. This
18356 forced us to run an expensive update operation far too often.
18357 Fixes bug 12170; bugfix on 0.1.2.1-alpha.
18358 - Avoid using tor_memeq() for checking relay cell integrity. This
18359 removes a possible performance bottleneck. Fixes part of bug
18360 12169; bugfix on 0.2.1.31.
18362 o Minor bugfixes (platform-specific):
18363 - When dumping a malformed directory object to disk, save it in
18364 binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
18366 - Don't report failures from make_socket_reuseable() on incoming
18367 sockets on OSX: this can happen when incoming connections close
18368 early. Fixes bug 10081.
18370 o Minor bugfixes (pluggable transports):
18371 - Avoid another 60-second delay when starting Tor in a pluggable-
18372 transport-using configuration when we already have cached
18373 descriptors for our bridges. Fixes bug 11965; bugfix
18376 o Minor bugfixes (protocol correctness):
18377 - When receiving a VERSIONS cell with an odd number of bytes, close
18378 the connection immediately since the cell is malformed. Fixes bug
18379 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
18382 o Minor bugfixes (relay, other):
18383 - We now drop CREATE cells for already-existent circuit IDs and for
18384 zero-valued circuit IDs, regardless of other factors that might
18385 otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
18387 - When rejecting DATA cells for stream_id zero, still count them
18388 against the circuit's deliver window so that we don't fail to send
18389 a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
18391 o Minor bugfixes (relay, threading):
18392 - Check return code on spawn_func() in cpuworker code, so that we
18393 don't think we've spawned a nonworking cpuworker and write junk to
18394 it forever. Fix related to bug 4345; bugfix on all released Tor
18395 versions. Found by "skruffy".
18396 - Use a pthread_attr to make sure that spawn_func() cannot return an
18397 error while at the same time launching a thread. Fix related to
18398 bug 4345; bugfix on all released Tor versions. Reported
18401 o Minor bugfixes (relays and bridges):
18402 - Avoid crashing on a malformed resolv.conf file when running a
18403 relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
18404 - Non-exit relays no longer launch mock DNS requests to check for
18405 DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
18406 non-exit relays stopped servicing DNS requests. Fixes bug 965;
18407 bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
18408 - Bridges now report complete directory request statistics. Related
18409 to bug 5824; bugfix on 0.2.2.1-alpha.
18410 - Bridges now never collect statistics that were designed for
18411 relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
18413 o Minor bugfixes (testing):
18414 - Fix all valgrind warnings produced by the unit tests. There were
18415 over a thousand memory leak warnings previously, mostly produced
18416 by forgetting to free things in the unit test code. Fixes bug
18417 11618, bugfixes on many versions of Tor.
18419 o Minor bugfixes (tor-fw-helper):
18420 - Give a correct log message when tor-fw-helper fails to launch.
18421 (Previously, we would say something like "tor-fw-helper sent us a
18422 string we could not parse".) Fixes bug 9781; bugfix
18425 o Minor bugfixes (trivial memory leaks):
18426 - Fix a small memory leak when signing a directory object. Fixes bug
18427 11275; bugfix on 0.2.4.13-alpha.
18428 - Resolve some memory leaks found by coverity in the unit tests, on
18429 exit in tor-gencert, and on a failure to compute digests for our
18430 own keys when generating a v3 networkstatus vote. These leaks
18431 should never have affected anyone in practice.
18433 o Code simplification and refactoring:
18434 - Remove some old fallback code designed to keep Tor clients working
18435 in a network with only two working relays. Elsewhere in the code we
18436 have long since stopped supporting such networks, so there wasn't
18437 much point in keeping it around. Addresses ticket 9926.
18438 - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
18439 bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
18440 - Extract the common duplicated code for creating a subdirectory
18441 of the data directory and writing to a file in it. Fixes ticket
18442 4282; patch from Peter Retzlaff.
18443 - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
18444 buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
18445 i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
18446 - Add a set of accessor functions for the circuit timeout data
18447 structure. Fixes ticket 6153; patch from "piet".
18448 - Clean up exit paths from connection_listener_new(). Closes ticket
18449 8789. Patch from Arlo Breault.
18450 - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
18451 and drop our own custom pkey_eq() implementation. Fixes bug 9043.
18452 - Use a doubly-linked list to implement the global circuit list.
18453 Resolves ticket 9108. Patch from Marek Majkowski.
18454 - Remove contrib/id_to_fp.c since it wasn't used anywhere.
18455 - Remove constants and tests for PKCS1 padding; it's insecure and
18456 shouldn't be used for anything new. Fixes bug 8792; patch
18458 - Remove instances of strcpy() from the unit tests. They weren't
18459 hurting anything, since they were only in the unit tests, but it's
18460 embarrassing to have strcpy() in the code at all, and some analysis
18461 tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
18462 0.2.3.8-alpha. Patch from Arlo Breault.
18463 - Remove is_internal_IP() function. Resolves ticket 4645.
18464 - Remove unused function circuit_dump_by_chan from circuitlist.c.
18465 Closes issue 9107; patch from "marek".
18466 - Change our use of the ENUM_BF macro to avoid declarations that
18468 - Get rid of router->address, since in all cases it was just the
18469 string representation of router->addr. Resolves ticket 5528.
18472 - Adjust the URLs in the README to refer to the new locations of
18473 several documents on the website. Fixes bug 12830. Patch from
18475 - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
18477 - Update manpage to describe some of the files you can expect to
18478 find in Tor's DataDirectory. Addresses ticket 9839.
18479 - Clean up several option names in the manpage to match their real
18480 names, add the missing documentation for a couple of testing and
18481 directory authority options, remove the documentation for a
18482 V2-directory fetching option that no longer exists. Resolves
18484 - Correct the documentation so that it lists the correct directory
18485 for the stats files. (They are in a subdirectory called "stats",
18487 - In the manpage, move more authority-only options into the
18488 directory authority section so that operators of regular directory
18489 caches don't get confused.
18490 - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
18491 11061; bugfix on 0.2.4.7-alpha.
18492 - Resolve warnings from Doxygen.
18493 - Document in the manpage that "KBytes" may also be written as
18494 "kilobytes" or "KB", that "Kbits" may also be written as
18495 "kilobits", and so forth. Closes ticket 9222.
18496 - Document that the ClientOnly config option overrides ORPort.
18497 Our old explanation made ClientOnly sound as though it did
18498 nothing at all. Resolves bug 9059.
18499 - Explain that SocksPolicy, DirPolicy, and similar options don't
18500 take port arguments. Fixes the other part of ticket 11108.
18501 - Fix a comment about the rend_server_descriptor_t.protocols field
18502 to more accurately describe its range. Also, make that field
18503 unsigned, to more accurately reflect its usage. Fixes bug 9099;
18504 bugfix on 0.2.1.5-alpha.
18505 - Fix the manpage's description of HiddenServiceAuthorizeClient:
18506 the maximum client name length is 16, not 19. Fixes bug 11118;
18507 bugfix on 0.2.1.6-alpha.
18510 - The contrib directory has been sorted and tidied. Before, it was
18511 an unsorted dumping ground for useful and not-so-useful things.
18512 Now, it is divided based on functionality, and the items which
18513 seemed to be nonfunctional or useless have been removed. Resolves
18514 ticket 8966; based on patches from "rl1987".
18516 o Removed code and features:
18517 - Clients now reject any directory authority certificates lacking
18518 a dir-key-crosscert element. These have been included since
18519 0.2.1.9-alpha, so there's no real reason for them to be optional
18520 any longer. Completes proposal 157. Resolves ticket 10162.
18521 - Remove all code that existed to support the v2 directory system,
18522 since there are no longer any v2 directory authorities. Resolves
18524 - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
18525 options, which were used for designating authorities as "Hidden
18526 service authorities". There has been no use of hidden service
18527 authorities since 0.2.2.1-alpha, when we stopped uploading or
18528 downloading v0 hidden service descriptors. Fixes bug 10881; also
18529 part of a fix for bug 10841.
18530 - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
18531 and MTBF calculations, but that nobody was using. Fixes bug 11742.
18532 - The TunnelDirConns and PreferTunnelledDirConns options no longer
18533 exist; tunneled directory connections have been available since
18534 0.1.2.5-alpha, and turning them off is not a good idea. This is a
18535 brute-force fix for 10849, where "TunnelDirConns 0" would break
18537 - Remove all code for the long unused v1 directory protocol.
18538 Resolves ticket 11070.
18539 - Remove all remaining code related to version-0 hidden service
18540 descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
18541 the rest of bug 10841.
18542 - Remove migration code from when we renamed the "cached-routers"
18543 file to "cached-descriptors" back in 0.2.0.8-alpha. This
18544 incidentally resolves ticket 6502 by cleaning up the related code
18545 a bit. Patch from Akshay Hebbar.
18547 o Test infrastructure:
18548 - Tor now builds each source file in two modes: a mode that avoids
18549 exposing identifiers needlessly, and another mode that exposes
18550 more identifiers for testing. This lets the compiler do better at
18551 optimizing the production code, while enabling us to take more
18552 radical measures to let the unit tests test things.
18553 - The production builds no longer include functions used only in
18554 the unit tests; all functions exposed from a module only for
18555 unit-testing are now static in production builds.
18556 - Add an --enable-coverage configuration option to make the unit
18557 tests (and a new src/or/tor-cov target) to build with gcov test
18559 - Update to the latest version of tinytest.
18560 - Improve the tinytest implementation of string operation tests so
18561 that comparisons with NULL strings no longer crash the tests; they
18562 now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
18563 - New macros in test.h to simplify writing mock-functions for unit
18564 tests. Part of ticket 11507. Patch from Dana Koch.
18565 - We now have rudimentary function mocking support that our unit
18566 tests can use to test functions in isolation. Function mocking
18567 lets the tests temporarily replace a function's dependencies with
18568 stub functions, so that the tests can check the function without
18569 invoking the other functions it calls.
18572 - Complete tests for the status.c module. Resolves ticket 11507.
18573 Patch from Dana Koch.
18574 - Add more unit tests for the <circid,channel>->circuit map, and
18575 the destroy-cell-tracking code to fix bug 7912.
18576 - Unit tests for failing cases of the TAP onion handshake.
18577 - More unit tests for address-manipulation functions.
18579 o Distribution (systemd):
18580 - Include a tor.service file in contrib/dist for use with systemd.
18581 Some distributions will be able to use this file unmodified;
18582 others will need to tweak it, or write their own. Patch from Jamie
18583 Nguyen; resolves ticket 8368.
18584 - Verify configuration file via ExecStartPre in the systemd unit
18585 file. Patch from intrigeri; resolves ticket 12730.
18586 - Explicitly disable RunAsDaemon in the systemd unit file. Our
18587 current systemd unit uses "Type = simple", so systemd does not
18588 expect tor to fork. If the user has "RunAsDaemon 1" in their
18589 torrc, then things won't work as expected. This is e.g. the case
18590 on Debian (and derivatives), since there we pass "--defaults-torrc
18591 /usr/share/tor/tor-service-defaults-torrc" (that contains
18592 "RunAsDaemon 1") by default. Patch by intrigeri; resolves
18596 Changes in version 0.2.4.25 - 2014-10-20
18597 Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
18598 (even though POODLE does not affect Tor). It also works around a crash
18599 bug caused by some operating systems' response to the "POODLE" attack
18600 (which does affect Tor).
18602 o Major security fixes (also in 0.2.5.9-rc):
18603 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
18604 today support TLS 1.0 or later, so we can safely turn off support
18605 for this old (and insecure) protocol. Fixes bug 13426.
18607 o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
18608 - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
18609 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
18610 13471. This is a workaround for an OpenSSL bug.
18613 Changes in version 0.2.4.24 - 2014-09-22
18614 Tor 0.2.4.24 fixes a bug that affects consistency and speed when
18615 connecting to hidden services, and it updates the location of one of
18616 the directory authorities.
18619 - Clients now send the correct address for their chosen rendezvous
18620 point when trying to access a hidden service. They used to send
18621 the wrong address, which would still work some of the time because
18622 they also sent the identity digest of the rendezvous point, and if
18623 the hidden service happened to try connecting to the rendezvous
18624 point from a relay that already had a connection open to it,
18625 the relay would reuse that connection. Now connections to hidden
18626 services should be more robust and faster. Also, this bug meant
18627 that clients were leaking to the hidden service whether they were
18628 on a little-endian (common) or big-endian (rare) system, which for
18629 some users might have reduced their anonymity. Fixes bug 13151;
18630 bugfix on 0.2.1.5-alpha.
18632 o Directory authority changes:
18633 - Change IP address for gabelmoo (v3 directory authority).
18635 o Minor features (geoip):
18636 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
18640 Changes in version 0.2.4.23 - 2014-07-28
18641 Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
18642 guard rotation, and also backports several important fixes from the
18643 Tor 0.2.5 alpha release series.
18646 - Clients now look at the "usecreatefast" consensus parameter to
18647 decide whether to use CREATE_FAST or CREATE cells for the first hop
18648 of their circuit. This approach can improve security on connections
18649 where Tor's circuit handshake is stronger than the available TLS
18650 connection security levels, but the tradeoff is more computational
18651 load on guard relays. Implements proposal 221. Resolves ticket 9386.
18652 - Make the number of entry guards configurable via a new
18653 NumEntryGuards consensus parameter, and the number of directory
18654 guards configurable via a new NumDirectoryGuards consensus
18655 parameter. Implements ticket 12688.
18658 - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
18659 implementation that caused incorrect results on 32-bit
18660 implementations when certain malformed inputs were used along with
18661 a small class of private ntor keys. This bug does not currently
18662 appear to allow an attacker to learn private keys or impersonate a
18663 Tor server, but it could provide a means to distinguish 32-bit Tor
18664 implementations from 64-bit Tor implementations. Fixes bug 12694;
18665 bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
18669 - Warn and drop the circuit if we receive an inbound 'relay early'
18670 cell. Those used to be normal to receive on hidden service circuits
18671 due to bug 1038, but the buggy Tor versions are long gone from
18672 the network so we can afford to resume watching for them. Resolves
18673 the rest of bug 1038; bugfix on 0.2.1.19.
18674 - Correct a confusing error message when trying to extend a circuit
18675 via the control protocol but we don't know a descriptor or
18676 microdescriptor for one of the specified relays. Fixes bug 12718;
18677 bugfix on 0.2.3.1-alpha.
18678 - Avoid an illegal read from stack when initializing the TLS
18679 module using a version of OpenSSL without all of the ciphers
18680 used by the v2 link handshake. Fixes bug 12227; bugfix on
18681 0.2.4.8-alpha. Found by "starlight".
18684 - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
18688 Changes in version 0.2.4.22 - 2014-05-16
18689 Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
18690 alpha release series. These include blocking all authority signing
18691 keys that may have been affected by the OpenSSL "heartbleed" bug,
18692 choosing a far more secure set of TLS ciphersuites by default, closing
18693 a couple of memory leaks that could be used to run a target relay out
18694 of RAM, and several others.
18696 o Major features (security, backport from 0.2.5.4-alpha):
18697 - Block authority signing keys that were used on authorities
18698 vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
18699 don't have any evidence that these keys _were_ compromised; we're
18700 doing this to be prudent.) Resolves ticket 11464.
18702 o Major bugfixes (security, OOM):
18703 - Fix a memory leak that could occur if a microdescriptor parse
18704 fails during the tokenizing step. This bug could enable a memory
18705 exhaustion attack by directory servers. Fixes bug 11649; bugfix
18708 o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
18709 - The relay ciphersuite list is now generated automatically based on
18710 uniform criteria, and includes all OpenSSL ciphersuites with
18711 acceptable strength and forward secrecy. Previously, we had left
18712 some perfectly fine ciphersuites unsupported due to omission or
18713 typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
18714 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
18715 - Relays now trust themselves to have a better view than clients of
18716 which TLS ciphersuites are better than others. (Thanks to bug
18717 11513, the relay list is now well-considered, whereas the client
18718 list has been chosen mainly for anti-fingerprinting purposes.)
18719 Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
18720 CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
18721 AES128. Resolves ticket 11528.
18722 - Clients now try to advertise the same list of ciphersuites as
18723 Firefox 28. This change enables selection of (fast) GCM
18724 ciphersuites, disables some strange old ciphers, and stops
18725 advertising the ECDH (not to be confused with ECDHE) ciphersuites.
18726 Resolves ticket 11438.
18728 o Minor bugfixes (configuration, security):
18729 - When running a hidden service, do not allow TunneledDirConns 0:
18730 trying to set that option together with a hidden service would
18731 otherwise prevent the hidden service from running, and also make
18732 it publish its descriptors directly over HTTP. Fixes bug 10849;
18733 bugfix on 0.2.1.1-alpha.
18735 o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
18736 - Avoid sending a garbage value to the controller when a circuit is
18737 cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
18739 o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
18740 - Stop leaking memory when we successfully resolve a PTR record.
18741 Fixes bug 11437; bugfix on 0.2.4.7-alpha.
18743 o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
18744 - Avoid 60-second delays in the bootstrapping process when Tor is
18745 launching for a second time while using bridges. Fixes bug 9229;
18746 bugfix on 0.2.0.3-alpha.
18748 o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
18749 - Give the correct URL in the warning message when trying to run a
18750 relay on an ancient version of Windows. Fixes bug 9393.
18752 o Minor bugfixes (compilation):
18753 - Fix a compilation error when compiling with --disable-curve25519.
18754 Fixes bug 9700; bugfix on 0.2.4.17-rc.
18757 - Downgrade the warning severity for the the "md was still
18758 referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
18759 for trying to diagnose this bug, and the current warning in
18760 earlier versions of tor achieves nothing useful. Addresses warning
18763 o Minor features (log verbosity, backport from 0.2.5.4-alpha):
18764 - When we run out of usable circuit IDs on a channel, log only one
18765 warning for the whole channel, and describe how many circuits
18766 there were on the channel. Fixes part of ticket 11553.
18768 o Minor features (security, backport from 0.2.5.4-alpha):
18769 - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
18770 leave the default at 8GBytes), to better support Raspberry Pi
18771 users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
18773 o Documentation (backport from 0.2.5.4-alpha):
18774 - Correctly document that we search for a system torrc file before
18775 looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
18779 Changes in version 0.2.4.21 - 2014-02-28
18780 Tor 0.2.4.21 further improves security against potential adversaries who
18781 find breaking 1024-bit crypto doable, and backports several stability
18782 and robustness patches from the 0.2.5 branch.
18784 o Major features (client security):
18785 - When we choose a path for a 3-hop circuit, make sure it contains
18786 at least one relay that supports the NTor circuit extension
18787 handshake. Otherwise, there is a chance that we're building
18788 a circuit that's worth attacking by an adversary who finds
18789 breaking 1024-bit crypto doable, and that chance changes the game
18790 theory. Implements ticket 9777.
18793 - Do not treat streams that fail with reason
18794 END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
18795 since it could also indicate an ENETUNREACH connection error. Fixes
18796 part of bug 10777; bugfix on 0.2.4.8-alpha.
18798 o Code simplification and refactoring:
18799 - Remove data structures which were introduced to implement the
18800 CellStatistics option: they are now redundant with the new timestamp
18801 field in the regular packed_cell_t data structure, which we did
18802 in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
18805 - Always clear OpenSSL bignums before freeing them -- even bignums
18806 that don't contain secrets. Resolves ticket 10793. Patch by
18808 - Build without warnings under clang 3.4. (We have some macros that
18809 define static functions only some of which will get used later in
18810 the module. Starting with clang 3.4, these give a warning unless the
18811 unused attribute is set on them.) Resolves ticket 10904.
18812 - Update geoip and geoip6 files to the February 7 2014 Maxmind
18813 GeoLite2 Country database.
18816 - Set the listen() backlog limit to the largest actually supported
18817 on the system, not to the value in a header file. Fixes bug 9716;
18818 bugfix on every released Tor.
18819 - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
18820 exit node as a NOROUTE error, not an INTERNAL error, since they
18821 can apparently happen when trying to connect to the wrong sort
18822 of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
18823 - Fix build warnings about missing "a2x" comment when building the
18824 manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
18825 Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
18826 - Avoid a segfault on SIGUSR1, where we had freed a connection but did
18827 not entirely remove it from the connection lists. Fixes bug 9602;
18828 bugfix on 0.2.4.4-alpha.
18829 - Fix a segmentation fault in our benchmark code when running with
18830 Fedora's OpenSSL package, or any other OpenSSL that provides
18831 ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
18832 - Turn "circuit handshake stats since last time" log messages into a
18833 heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
18835 o Documentation fixes:
18836 - Document that all but one DirPort entry must have the NoAdvertise
18837 flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
18840 Changes in version 0.2.4.20 - 2013-12-22
18841 Tor 0.2.4.20 fixes potentially poor random number generation for users
18842 who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
18843 torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
18844 and 4) have no state file in their DataDirectory (as would happen on
18845 first start). Users who generated relay or hidden service identity
18846 keys in such a situation should discard them and generate new ones.
18848 This release also fixes a logic error that caused Tor clients to build
18849 many more preemptive circuits than they actually need.
18852 - Do not allow OpenSSL engines to replace the PRNG, even when
18853 HardwareAccel is set. The only default builtin PRNG engine uses
18854 the Intel RDRAND instruction to replace the entire PRNG, and
18855 ignores all attempts to seed it with more entropy. That's
18856 cryptographically stupid: the right response to a new alleged
18857 entropy source is never to discard all previously used entropy
18858 sources. Fixes bug 10402; works around behavior introduced in
18859 OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
18861 - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
18862 address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
18863 - Avoid launching spurious extra circuits when a stream is pending.
18864 This fixes a bug where any circuit that _wasn't_ unusable for new
18865 streams would be treated as if it were, causing extra circuits to
18866 be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
18869 - Avoid a crash bug when starting with a corrupted microdescriptor
18870 cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
18871 - If we fail to dump a previously cached microdescriptor to disk, avoid
18872 freeing duplicate data later on. Fixes bug 10423; bugfix on
18873 0.2.4.13-alpha. Spotted by "bobnomnom".
18876 Changes in version 0.2.4.19 - 2013-12-11
18877 The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
18878 (1986-2013). Aaron worked on diverse projects including helping to guide
18879 Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
18880 transparency to the U.S government's PACER documents, and contributing
18881 design and development for Tor and Tor2Web. Aaron was one of the latest
18882 martyrs in our collective fight for civil liberties and human rights,
18883 and his death is all the more painful because he was one of us.
18885 Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
18886 a new circuit handshake and link encryption that use ECC to provide
18887 better security and efficiency; makes relays better manage circuit
18888 creation requests; uses "directory guards" to reduce client enumeration
18889 risks; makes bridges collect and report statistics about the pluggable
18890 transports they support; cleans up and improves our geoip database;
18891 gets much closer to IPv6 support for clients, bridges, and relays; makes
18892 directory authorities use measured bandwidths rather than advertised
18893 ones when computing flags and thresholds; disables client-side DNS
18894 caching to reduce tracking risks; and fixes a big bug in bridge
18895 reachability testing. This release introduces two new design
18896 abstractions in the code: a new "channel" abstraction between circuits
18897 and or_connections to allow for implementing alternate relay-to-relay
18898 transports, and a new "circuitmux" abstraction storing the queue of
18899 circuits for a channel. The release also includes many stability,
18900 security, and privacy fixes.
18902 o Major features (new circuit handshake):
18903 - Tor now supports a new circuit extension handshake designed by Ian
18904 Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
18905 circuit extension handshake, later called "TAP", was a bit slow
18906 (especially on the relay side), had a fragile security proof, and
18907 used weaker keys than we'd now prefer. The new circuit handshake
18908 uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
18909 function, making it significantly more secure than the older
18910 handshake, and significantly faster. Tor can use one of two built-in
18911 pure-C curve25519-donna implementations by Adam Langley, or it
18912 can link against the "nacl" library for a tuned version if present.
18914 The built-in version is very fast for 64-bit systems when building
18915 with GCC. The built-in 32-bit version is still faster than the
18916 old TAP protocol, but using libnacl is better on most such hosts.
18918 Implements proposal 216; closes ticket 7202.
18920 o Major features (better link encryption):
18921 - Relays can now enable the ECDHE TLS ciphersuites when available
18922 and appropriate. These ciphersuites let us negotiate forward-secure
18923 TLS secret keys more safely and more efficiently than with our
18924 previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
18925 public relays prefer the (faster) P224 group, and bridges prefer
18926 the (more common) P256 group; you can override this with the
18929 This feature requires clients running 0.2.3.17-beta or later,
18930 and requires both sides to be running OpenSSL 1.0.0 or later
18931 with ECC support. OpenSSL 1.0.1, with the compile-time option
18932 "enable-ec_nistp_64_gcc_128", is highly recommended.
18934 Implements the relay side of proposal 198; closes ticket 7200.
18936 - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
18937 Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
18938 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
18939 renegotiation from working with TLS 1.1 or 1.2, so we had disabled
18940 them to solve bug 6033.)
18942 o Major features (relay performance):
18943 - Instead of limiting the number of queued onionskins (aka circuit
18944 create requests) to a fixed, hard-to-configure number, we limit
18945 the size of the queue based on how many we expect to be able to
18946 process in a given amount of time. We estimate the time it will
18947 take to process an onionskin based on average processing time
18948 of previous onionskins. Closes ticket 7291. You'll never have to
18949 configure MaxOnionsPending again.
18950 - Relays process the new "NTor" circuit-level handshake requests
18951 with higher priority than the old "TAP" circuit-level handshake
18952 requests. We still process some TAP requests to not totally starve
18953 0.2.3 clients when NTor becomes popular. A new consensus parameter
18954 "NumNTorsPerTAP" lets us tune the balance later if we need to.
18955 Implements ticket 9574.
18957 o Major features (client bootstrapping resilience):
18958 - Add a new "FallbackDir" torrc option to use when we can't use
18959 a directory mirror from the consensus (either because we lack a
18960 consensus, or because they're all down). Currently, all authorities
18961 are fallbacks by default, and there are no other default fallbacks,
18962 but that will change. This option will allow us to give clients a
18963 longer list of servers to try to get a consensus from when first
18964 connecting to the Tor network, and thereby reduce load on the
18965 directory authorities. Implements proposal 206, "Preconfigured
18966 directory sources for bootstrapping". We also removed the old
18967 "FallbackNetworkstatus" option, since we never got it working well
18968 enough to use it. Closes bug 572.
18969 - If we have no circuits open, use a relaxed timeout (the
18970 95th-percentile cutoff) until a circuit succeeds. This heuristic
18971 should allow Tor to succeed at building circuits even when the
18972 network connection drastically changes. Should help with bug 3443.
18974 o Major features (use of guards):
18975 - Support directory guards (proposal 207): when possible, clients now
18976 use their entry guards for non-anonymous directory requests. This
18977 can help prevent client enumeration. Note that this behavior only
18978 works when we have a usable consensus directory, and when options
18979 about what to download are more or less standard. In the future we
18980 should re-bootstrap from our guards, rather than re-bootstrapping
18981 from the preconfigured list of directory sources that ships with
18982 Tor. Resolves ticket 6526.
18983 - Raise the default time that a client keeps an entry guard from
18984 "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
18985 2012 paper. (We would make it even longer, but we need better client
18986 load balancing first.) Also, make the guard lifetime controllable
18987 via a new GuardLifetime torrc option and a GuardLifetime consensus
18988 parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
18990 o Major features (bridges with pluggable transports):
18991 - Bridges now report the pluggable transports they support to the
18992 bridge authority, so it can pass the supported transports on to
18993 bridgedb and/or eventually do reachability testing. Implements
18995 - Automatically forward the TCP ports of pluggable transport
18996 proxies using tor-fw-helper if PortForwarding is enabled. Implements
18999 o Major features (geoip database):
19000 - Maxmind began labelling Tor relays as being in country "A1",
19001 which breaks by-country node selection inside Tor. Now we use a
19002 script to replace "A1" ("Anonymous Proxy") entries in our geoip
19003 file with real country codes. This script fixes about 90% of "A1"
19004 entries automatically and uses manual country code assignments to
19005 fix the remaining 10%. See src/config/README.geoip for details.
19007 - Add GeoIP database for IPv6 addresses. The new config option
19009 - Update to the October 2 2013 Maxmind GeoLite Country database.
19011 o Major features (IPv6):
19012 - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
19013 IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
19014 to happen. Implements ticket 5535.
19015 - All kind of relays, not just bridges, can now advertise an IPv6
19016 OR port. Implements ticket 6362.
19017 - Relays can now exit to IPv6 addresses: make sure that you have IPv6
19018 connectivity, then set the IPv6Exit flag to 1. Also make sure your
19019 exit policy reads as you would like: the address * applies to all
19020 address families, whereas *4 is IPv4 address only, and *6 is IPv6
19021 addresses only. On the client side, you'll need to wait for enough
19022 exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
19023 and use Socks5. Closes ticket 5547, implements proposal 117 as
19024 revised in proposal 208.
19025 - Bridge authorities now accept IPv6 bridge addresses and include
19026 them in network status documents. Implements ticket 5534.
19027 - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
19029 o Major features (directory authorities):
19030 - Directory authorities now prefer using measured bandwidths to
19031 advertised ones when computing flags and thresholds. Resolves
19033 - Directory authorities that vote measured bandwidths about more
19034 than a threshold number of relays now treat relays with
19035 unmeasured bandwidths as having bandwidth 0 when computing their
19036 flags. Resolves ticket 8435.
19037 - Directory authorities now support a new consensus method (17)
19038 where they cap the published bandwidth of relays for which
19039 insufficient bandwidth measurements exist. Fixes part of bug 2286.
19040 - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
19041 serve any v2 directory information. Now we can test disabling the
19042 old deprecated v2 directory format, and see whether doing so has
19043 any effect on network load. Begins to fix bug 6783.
19045 o Major features (build and portability):
19046 - Switch to a nonrecursive Makefile structure. Now instead of each
19047 Makefile.am invoking other Makefile.am's, there is a master
19048 Makefile.am that includes the others. This change makes our build
19049 process slightly more maintainable, and improves parallelism for
19050 building with make -j. Original patch by Stewart Smith; various
19051 fixes by Jim Meyering.
19052 - Where available, we now use automake's "silent" make rules by
19053 default, so that warnings are easier to spot. You can get the old
19054 behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
19055 - Resume building correctly with MSVC and Makefile.nmake. This patch
19056 resolves numerous bugs and fixes reported by ultramage, including
19057 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
19059 o Security features:
19060 - Switch to a completely time-invariant approach for picking nodes
19061 weighted by bandwidth. Our old approach would run through the
19062 part of the loop after it had made its choice slightly slower
19063 than it ran through the part of the loop before it had made its
19064 choice. Addresses ticket 6538.
19065 - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
19066 by tor2web clients allows hidden services to identify tor2web
19067 clients through their repeated selection of the same rendezvous
19068 and introduction point circuit endpoints (their guards). Resolves
19071 o Major bugfixes (relay denial of service):
19072 - When we have too much memory queued in circuits (according to a new
19073 MaxMemInCellQueues option), close the circuits that have the oldest
19074 queued cells, on the theory that those are most responsible for
19075 us running low on memory. This prevents us from running out of
19076 memory as a relay if circuits fill up faster than they can be
19077 drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
19078 Tor. This bug is a further fix beyond bug 6252, whose fix was
19079 merged into 0.2.3.21-rc.
19080 - Reject bogus create and relay cells with 0 circuit ID or 0 stream
19081 ID: these could be used to create unexpected streams and circuits
19082 which would count as "present" to some parts of Tor but "absent"
19083 to others, leading to zombie circuits and streams or to a bandwidth
19084 denial-of-service. Fixes bug 7889; bugfix on every released version
19085 of Tor. Reported by "oftc_must_be_destroyed".
19086 - Avoid a bug where our response to TLS renegotiation under certain
19087 network conditions could lead to a busy-loop, with 100% CPU
19088 consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
19090 o Major bugfixes (asserts, crashes, leaks):
19091 - Prevent the get_freelists() function from running off the end of
19092 the list of freelists if it somehow gets an unrecognized
19093 allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
19095 - Avoid a memory leak where we would leak a consensus body when we
19096 find that a consensus which we couldn't previously verify due to
19097 missing certificates is now verifiable. Fixes bug 8719; bugfix
19099 - If we are unable to save a microdescriptor to the journal, do not
19100 drop it from memory and then reattempt downloading it. Fixes bug
19101 9645; bugfix on 0.2.2.6-alpha.
19102 - Fix an assertion failure that would occur when disabling the
19103 ORPort setting on a running Tor process while accounting was
19104 enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
19105 - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
19106 when an exit connection with optimistic data succeeds immediately
19107 rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
19109 - Fix a memory leak that would occur whenever a configuration
19110 option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
19112 o Major bugfixes (relay rate limiting):
19113 - When a TLS write is partially successful but incomplete, remember
19114 that the flushed part has been flushed, and notice that bytes were
19115 actually written. Reported and fixed pseudonymously. Fixes bug 7708;
19116 bugfix on Tor 0.1.0.5-rc.
19117 - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
19118 to 1GB/1GB. The previous defaults were intended to be "basically
19119 infinite", but it turns out they're now limiting our 100mbit+
19120 relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
19121 last time we raised it).
19122 - No longer stop reading or writing on cpuworker connections when
19123 our rate limiting buckets go empty. Now we should handle circuit
19124 handshake requests more promptly. Resolves bug 9731.
19126 o Major bugfixes (client-side privacy):
19127 - When we mark a circuit as unusable for new circuits, have it
19128 continue to be unusable for new circuits even if MaxCircuitDirtiness
19129 is increased too much at the wrong time, or the system clock jumps
19130 backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
19131 - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
19132 which have resolved to internal addresses") is set, apply that
19133 rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
19134 - When an exit relay rejects a stream with reason "exit policy", but
19135 we only know an exit policy summary (e.g. from the microdesc
19136 consensus) for it, do not mark the relay as useless for all exiting.
19137 Instead, mark just the circuit as unsuitable for that particular
19138 address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
19140 o Major bugfixes (stream isolation):
19141 - Allow applications to get proper stream isolation with
19142 IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
19143 username/password authentication also offer "no authentication". Tor
19144 had previously preferred "no authentication", so the applications
19145 never actually sent Tor their auth details. Now Tor selects
19146 username/password authentication if it's offered. You can disable
19147 this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
19148 bug 8117; bugfix on 0.2.3.3-alpha.
19149 - Follow the socks5 protocol when offering username/password
19150 authentication. The fix for bug 8117 exposed this bug, and it
19151 turns out real-world applications like Pidgin do care. Bugfix on
19152 0.2.3.2-alpha; fixes bug 8879.
19154 o Major bugfixes (client circuit building):
19155 - Alter circuit build timeout measurement to start at the point
19156 where we begin the CREATE/CREATE_FAST step (as opposed to circuit
19157 initialization). This should make our timeout measurements more
19158 uniform. Previously, we were sometimes including ORconn setup time
19159 in our circuit build time measurements. Should resolve bug 3443.
19160 - If the circuit build timeout logic is disabled (via the consensus,
19161 or because we are an authority), then don't build testing circuits.
19162 Fixes bug 9657; bugfix on 0.2.2.14-alpha.
19164 o Major bugfixes (client-side DNS):
19165 - Turn off the client-side DNS cache by default. Updating and using
19166 the DNS cache is now configurable on a per-client-port
19167 level. SOCKSPort, DNSPort, etc lines may now contain
19168 {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
19169 cache these types of DNS answers when we receive them from an
19170 exit node in response to an application request on this port, and
19171 {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
19172 cached DNS answers of these types, we shouldn't use them. It's
19173 potentially risky to use cached DNS answers at the client, since
19174 doing so can indicate to one exit what answers we've gotten
19175 for DNS lookups in the past. With IPv6, this becomes especially
19176 problematic. Using cached DNS answers for requests on the same
19177 circuit would present less linkability risk, since all traffic
19178 on a circuit is already linkable, but it would also provide
19179 little performance benefit: the exit node caches DNS replies
19180 too. Implements a simplified version of Proposal 205. Implements
19183 o Major bugfixes (hidden service privacy):
19184 - Limit hidden service descriptors to at most ten introduction
19185 points, to slow one kind of guard enumeration. Fixes bug 9002;
19186 bugfix on 0.1.1.11-alpha.
19188 o Major bugfixes (directory fetching):
19189 - If the time to download the next old-style networkstatus is in
19190 the future, do not decline to consider whether to download the
19191 next microdescriptor networkstatus. Fixes bug 9564; bugfix on
19193 - We used to always request authority certificates by identity digest,
19194 meaning we'd get the newest one even when we wanted one with a
19195 different signing key. Then we would complain about being given
19196 a certificate we already had, and never get the one we really
19197 wanted. Now we use the "fp-sk/" resource as well as the "fp/"
19198 resource to request the one we want. Fixes bug 5595; bugfix on
19201 o Major bugfixes (bridge reachability):
19202 - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
19203 previously they did not, which prevented them from receiving
19204 successful connections from relays for self-test or bandwidth
19205 testing. Also, when a relay is extending a circuit to a bridge,
19206 it needs to send a NETINFO cell, even when the bridge hasn't sent
19207 an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
19209 o Major bugfixes (control interface):
19210 - When receiving a new configuration file via the control port's
19211 LOADCONF command, do not treat the defaults file as absent.
19212 Fixes bug 9122; bugfix on 0.2.3.9-alpha.
19214 o Major bugfixes (directory authorities):
19215 - Stop marking every relay as having been down for one hour every
19216 time we restart a directory authority. These artificial downtimes
19217 were messing with our Stable and Guard flag calculations. Fixes
19218 bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
19219 - When computing directory thresholds, ignore any rejected-as-sybil
19220 nodes during the computation so that they can't influence Fast,
19221 Guard, etc. (We should have done this for proposal 109.) Fixes
19223 - When marking a node as a likely sybil, reset its uptime metrics
19224 to zero, so that it cannot time towards getting marked as Guard,
19225 Stable, or HSDir. (We should have done this for proposal 109.) Fixes
19227 - Fix a bug in the voting algorithm that could yield incorrect results
19228 when a non-naming authority declared too many flags. Fixes bug 9200;
19229 bugfix on 0.2.0.3-alpha.
19231 o Internal abstraction features:
19232 - Introduce new channel_t abstraction between circuits and
19233 or_connection_t to allow for implementing alternate OR-to-OR
19234 transports. A channel_t is an abstract object which can either be a
19235 cell-bearing channel, which is responsible for authenticating and
19236 handshaking with the remote OR and transmitting cells to and from
19237 it, or a listening channel, which spawns new cell-bearing channels
19238 at the request of remote ORs. Implements part of ticket 6465.
19239 - Make a channel_tls_t subclass of channel_t, adapting it to the
19240 existing or_connection_t code. The V2/V3 protocol handshaking
19241 code which formerly resided in command.c has been moved below the
19242 channel_t abstraction layer and may be found in channeltls.c now.
19243 Implements the rest of ticket 6465.
19244 - Introduce new circuitmux_t storing the queue of circuits for
19245 a channel; this encapsulates and abstracts the queue logic and
19246 circuit selection policy, and allows the latter to be overridden
19247 easily by switching out a policy object. The existing EWMA behavior
19248 is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
19250 o New build requirements:
19251 - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
19252 strongly recommended.
19253 - Tor maintainers now require Automake version 1.9 or later to build
19254 Tor from the Git repository. (Automake is not required when building
19255 from a source distribution.)
19257 o Minor features (protocol):
19258 - No longer include the "opt" prefix when generating routerinfos
19259 or v2 directories: it has been needless since Tor 0.1.2. Closes
19261 - Reject EXTEND cells sent to nonexistent streams. According to the
19262 spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
19263 we were only checking for stream IDs that were currently in use.
19264 Found while hunting for more instances of bug 6271. Bugfix on
19265 0.0.2pre8, which introduced incremental circuit construction.
19266 - Tor relays and clients now support a better CREATE/EXTEND cell
19267 format, allowing the sender to specify multiple address, identity,
19268 and handshake types. Implements Robert Ransom's proposal 200;
19269 closes ticket 7199.
19270 - Reject as invalid most directory objects containing a NUL.
19271 Belt-and-suspender fix for bug 8037.
19273 o Minor features (security):
19274 - Clear keys and key-derived material left on the stack in
19275 rendservice.c and rendclient.c. Check return value of
19276 crypto_pk_write_private_key_to_string() in rend_service_load_keys().
19277 These fixes should make us more forward-secure against cold-boot
19278 attacks and the like. Fixes bug 2385.
19279 - Use our own weak RNG when we need a weak RNG. Windows's rand() and
19280 Irix's random() only return 15 bits; Solaris's random() returns more
19281 bits but its RAND_MAX says it only returns 15, and so on. Motivated
19282 by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
19284 o Minor features (control protocol):
19285 - Add a "GETINFO signal/names" control port command. Implements
19287 - Provide default values for all options via "GETINFO config/defaults".
19288 Implements ticket 4971.
19289 - Allow an optional $ before the node identity digest in the
19290 controller command GETINFO ns/id/<identity>, for consistency with
19291 md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
19292 - Add CACHED keyword to ADDRMAP events in the control protocol
19293 to indicate whether a DNS result will be cached or not. Resolves
19295 - Generate bootstrapping status update events correctly when fetching
19296 microdescriptors. Fixes bug 9927.
19298 o Minor features (path selection):
19299 - When deciding whether we have enough descriptors to build circuits,
19300 instead of looking at raw relay counts, look at which fraction
19301 of (bandwidth-weighted) paths we're able to build. This approach
19302 keeps clients from building circuits if their paths are likely to
19303 stand out statistically. The default fraction of paths needed is
19304 taken from the consensus directory; you can override it with the
19305 new PathsNeededToBuildCircuits option. Fixes ticket 5956.
19306 - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
19307 and we have GeoIP information, also exclude all nodes with unknown
19308 countries "??" and "A1". This behavior is controlled by the
19309 new GeoIPExcludeUnknown option: you can make such nodes always
19310 excluded with "GeoIPExcludeUnknown 1", and disable the feature
19311 with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
19312 gets you the default behavior. Implements feature 7706.
19314 o Minor features (hidden services):
19315 - Improve circuit build timeout handling for hidden services.
19316 In particular: adjust build timeouts more accurately depending
19317 upon the number of hop-RTTs that a particular circuit type
19318 undergoes. Additionally, launch intro circuits in parallel
19319 if they timeout, and take the first one to reply as valid.
19320 - The Tor client now ignores sub-domain components of a .onion
19321 address. This change makes HTTP "virtual" hosting
19322 possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
19323 http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
19324 hosted on the same hidden service. Implements proposal 204.
19325 - Enable Tor to read configuration, state, and key information from
19326 a FIFO. Previously Tor would only read from files with a positive
19327 stat.st_size. Code from meejah; fixes bug 6044.
19329 o Minor features (clients):
19330 - Teach bridge-using clients to avoid 0.2.2.x bridges when making
19331 microdescriptor-related dir requests, and only fall back to normal
19332 descriptors if none of their bridges can handle microdescriptors
19333 (as opposed to the fix in ticket 4013, which caused them to fall
19334 back to normal descriptors if *any* of their bridges preferred
19335 them). Resolves ticket 4994.
19336 - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
19337 TCP ports to forward. In the past it only accepted two ports:
19338 the ORPort and the DirPort.
19340 o Minor features (protecting client timestamps):
19341 - Clients no longer send timestamps in their NETINFO cells. These were
19342 not used for anything, and they provided one small way for clients
19343 to be distinguished from each other as they moved from network to
19344 network or behind NAT. Implements part of proposal 222.
19345 - Clients now round timestamps in INTRODUCE cells down to the nearest
19346 10 minutes. If a new Support022HiddenServices option is set to 0, or
19347 if it's set to "auto" and the feature is disabled in the consensus,
19348 the timestamp is sent as 0 instead. Implements part of proposal 222.
19349 - Stop sending timestamps in AUTHENTICATE cells. This is not such
19350 a big deal from a security point of view, but it achieves no actual
19351 good purpose, and isn't needed. Implements part of proposal 222.
19352 - Reduce down accuracy of timestamps in hidden service descriptors.
19353 Implements part of proposal 222.
19355 o Minor features (bridges):
19356 - Make bridge relays check once a minute for whether their IP
19357 address has changed, rather than only every 15 minutes. Resolves
19358 bugs 1913 and 1992.
19359 - Bridge statistics now count bridge clients connecting over IPv6:
19360 bridge statistics files now list "bridge-ip-versions" and
19361 extra-info documents list "geoip6-db-digest". The control protocol
19362 "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
19363 implementation by "shkoo", addressing ticket 5055.
19364 - Add a new torrc option "ServerTransportListenAddr" to let bridge
19365 operators select the address where their pluggable transports will
19366 listen for connections. Resolves ticket 7013.
19367 - Randomize the lifetime of our SSL link certificate, so censors can't
19368 use the static value for filtering Tor flows. Resolves ticket 8443;
19369 related to ticket 4014 which was included in 0.2.2.33.
19371 o Minor features (relays):
19372 - Option OutboundBindAddress can be specified multiple times and
19373 accepts IPv6 addresses. Resolves ticket 6876.
19375 o Minor features (IPv6, client side):
19376 - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
19377 prefer to hand out virtual IPv6 addresses, since there are more of
19378 them and we can't run out. To override this behavior and make IPv4
19379 addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
19380 or DNSPort you're using for resolving. Implements ticket 7571.
19381 - AutomapHostsOnResolve responses are now randomized, to avoid
19382 annoying situations where Tor is restarted and applications
19383 connect to the wrong addresses.
19384 - Never try more than 1000 times to pick a new virtual address when
19385 AutomapHostsOnResolve is set. That's good enough so long as we
19386 aren't close to handing out our entire virtual address space;
19387 if you're getting there, it's best to switch to IPv6 virtual
19390 o Minor features (IPv6, relay/authority side):
19391 - New config option "AuthDirHasIPv6Connectivity 1" that directory
19392 authorities should set if they have IPv6 connectivity and want to
19393 do reachability tests for IPv6 relays. Implements feature 5974.
19394 - A relay with an IPv6 OR port now sends that address in NETINFO
19395 cells (in addition to its other address). Implements ticket 6364.
19397 o Minor features (directory authorities):
19398 - Directory authorities no long accept descriptors for any version of
19399 Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
19400 These versions are insecure, unsupported, or both. Implements
19402 - When directory authorities are computing thresholds for flags,
19403 never let the threshold for the Fast flag fall below 4096
19404 bytes. Also, do not consider nodes with extremely low bandwidths
19405 when deciding thresholds for various directory flags. This change
19406 should raise our threshold for Fast relays, possibly in turn
19407 improving overall network performance; see ticket 1854. Resolves
19409 - Directory authorities now include inside each vote a statement of
19410 the performance thresholds they used when assigning flags.
19411 Implements ticket 8151.
19412 - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
19413 in directory authority votes to describe whether they have enough
19414 measured bandwidths to ignore advertised (relay descriptor)
19415 bandwidth claims. Resolves ticket 8711.
19417 o Minor features (path bias detection):
19418 - Path Use Bias: Perform separate accounting for successful circuit
19419 use. Keep separate statistics on stream attempt rates versus stream
19420 success rates for each guard. Provide configurable thresholds to
19421 determine when to emit log messages or disable use of guards that
19422 fail too many stream attempts. Resolves ticket 7802.
19423 - Create three levels of Path Bias log messages, as opposed to just
19424 two. These are configurable via consensus as well as via the torrc
19425 options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
19426 The default values are 0.70, 0.50, and 0.30 respectively.
19427 - Separate the log message levels from the decision to drop guards,
19428 which also is available via torrc option PathBiasDropGuards.
19429 PathBiasDropGuards still defaults to 0 (off).
19430 - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
19431 in combination with PathBiasExtremeRate.
19432 - Increase the default values for PathBiasScaleThreshold and
19433 PathBiasCircThreshold from (200, 20) to (300, 150).
19434 - Add in circuit usage accounting to path bias. If we try to use a
19435 built circuit but fail for any reason, it counts as path bias.
19436 Certain classes of circuits where the adversary gets to pick your
19437 destination node are exempt from this accounting. Usage accounting
19438 can be specifically disabled via consensus parameter or torrc.
19439 - Convert all internal path bias state to double-precision floating
19440 point, to avoid roundoff error and other issues.
19441 - Only record path bias information for circuits that have completed
19442 *two* hops. Assuming end-to-end tagging is the attack vector, this
19443 makes us more resilient to ambient circuit failure without any
19444 detection capability loss.
19446 o Minor features (build):
19447 - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
19448 dhill. Resolves ticket 6982.
19449 - Compile on win64 using mingw64. Fixes bug 7260; patches from
19451 - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
19452 separate error codes; or at least, don't break for that reason.
19453 Fixes bug 7935. Reported by "oftc_must_be_destroyed".
19455 o Build improvements (autotools):
19456 - Warn if building on a platform with an unsigned time_t: there
19457 are too many places where Tor currently assumes that time_t can
19458 hold negative values. We'd like to fix them all, but probably
19460 - Do not report status verbosely from autogen.sh unless the -v flag
19461 is specified. Fixes issue 4664. Patch from Onizuka.
19462 - Detect and reject attempts to build Tor with threading support
19463 when OpenSSL has been compiled without threading support.
19465 - Try to detect if we are ever building on a platform where
19466 memset(...,0,...) does not set the value of a double to 0.0. Such
19467 platforms are permitted by the C standard, though in practice
19468 they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
19469 currently support them, but it's better to detect them and fail
19470 than to perform erroneously.
19471 - We no longer warn so much when generating manpages from their
19473 - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
19474 the signs of types during autoconf. This is better than our old
19475 approach, which didn't work when cross-compiling.
19477 o Minor features (log messages, warnings):
19478 - Detect when we're running with a version of OpenSSL other than the
19479 one we compiled with. This conflict has occasionally given people
19480 hard-to-track-down errors.
19481 - Warn users who run hidden services on a Tor client with
19482 UseEntryGuards disabled that their hidden services will be
19483 vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
19484 attack which motivated Tor to support entry guards in the first
19485 place). Resolves ticket 6889.
19486 - Warn when we are binding low ports when hibernation is enabled;
19487 previously we had warned when we were _advertising_ low ports with
19488 hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
19489 - Issue a warning when running with the bufferevents backend enabled.
19490 It's still not stable, and people should know that they're likely
19491 to hit unexpected problems. Closes ticket 9147.
19493 o Minor features (log messages, notices):
19494 - Refactor resolve_my_address() so it returns the method by which we
19495 decided our public IP address (explicitly configured, resolved from
19496 explicit hostname, guessed from interfaces, learned by gethostname).
19497 Now we can provide more helpful log messages when a relay guesses
19498 its IP address incorrectly (e.g. due to unexpected lines in
19499 /etc/hosts). Resolves ticket 2267.
19500 - Track how many "TAP" and "NTor" circuit handshake requests we get,
19501 and how many we complete, and log it every hour to help relay
19502 operators follow trends in network load. Addresses ticket 9658.
19504 o Minor features (log messages, diagnostics):
19505 - If we fail to free a microdescriptor because of bug 7164, log
19506 the filename and line number from which we tried to free it.
19507 - We compute the overhead from passing onionskins back and forth to
19508 cpuworkers, and report it when dumping statistics in response to
19509 SIGUSR1. Supports ticket 7291.
19510 - Add another diagnostic to the heartbeat message: track and log
19511 overhead that TLS is adding to the data we write. If this is
19512 high, we are sending too little data to SSL_write at a time.
19513 Diagnostic for bug 7707.
19514 - Log packaged cell fullness as part of the heartbeat message.
19515 Diagnosis to try to determine the extent of bug 7743.
19516 - Add more detail to a log message about relaxed timeouts, to help
19518 - When learning a fingerprint for a bridge, log its corresponding
19519 transport type. Implements ticket 7896.
19520 - Warn more aggressively when flushing microdescriptors to a
19521 microdescriptor cache fails, in an attempt to mitigate bug 8031,
19522 or at least make it more diagnosable.
19523 - Improve the log message when "Bug/attack: unexpected sendme cell
19524 from client" occurs, to help us track bug 8093.
19525 - Improve debugging output to help track down bug 8185 ("Bug:
19526 outgoing relay cell has n_chan==NULL. Dropping.")
19528 o Minor features (log messages, quieter bootstrapping):
19529 - Log fewer lines at level "notice" about our OpenSSL and Libevent
19530 versions and capabilities when everything is going right. Resolves
19531 part of ticket 6736.
19532 - Omit the first heartbeat log message, because it never has anything
19533 useful to say, and it clutters up the bootstrapping messages.
19534 Resolves ticket 6758.
19535 - Don't log about reloading the microdescriptor cache at startup. Our
19536 bootstrap warnings are supposed to tell the user when there's a
19537 problem, and our bootstrap notices say when there isn't. Resolves
19538 ticket 6759; bugfix on 0.2.2.6-alpha.
19539 - Don't log "I learned some more directory information" when we're
19540 reading cached directory information. Reserve it for when new
19541 directory information arrives in response to a fetch. Resolves
19543 - Don't complain about bootstrapping problems while hibernating.
19544 These complaints reflect a general code problem, but not one
19545 with any problematic effects (no connections are actually
19546 opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
19548 o Minor features (testing):
19549 - In our testsuite, create temporary directories with a bit more
19550 entropy in their name to make name collisions less likely. Fixes
19552 - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
19553 (P-256) Diffie-Hellman handshakes to src/or/bench.
19554 - Add benchmark functions to test onion handshake performance.
19557 - The DirServer option is now DirAuthority, for consistency with
19558 current naming patterns. You can still use the old DirServer form.
19560 o Minor bugfixes (protocol):
19561 - Fix the handling of a TRUNCATE cell when it arrives while the
19562 circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
19563 - When a Tor client gets a "truncated" relay cell, the first byte of
19564 its payload specifies why the circuit was truncated. We were
19565 ignoring this 'reason' byte when tearing down the circuit, resulting
19566 in the controller not being told why the circuit closed. Now we
19567 pass the reason from the truncated cell to the controller. Bugfix
19568 on 0.1.2.3-alpha; fixes bug 7039.
19569 - Fix a misframing issue when reading the version numbers in a
19570 VERSIONS cell. Previously we would recognize [00 01 00 02] as
19571 'version 1, version 2, and version 0x100', when it should have
19572 only included versions 1 and 2. Fixes bug 8059; bugfix on
19573 0.2.0.10-alpha. Reported pseudonymously.
19574 - Make the format and order of STREAM events for DNS lookups
19575 consistent among the various ways to launch DNS lookups. Fixes
19576 bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
19578 o Minor bugfixes (syscalls and disk interaction):
19579 - Always check the return values of functions fcntl() and
19580 setsockopt(). We don't believe these are ever actually failing in
19581 practice, but better safe than sorry. Also, checking these return
19582 values should please analysis tools like Coverity. Patch from
19583 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
19584 - Avoid double-closing the listener socket in our socketpair()
19585 replacement (used on Windows) in the case where the addresses on
19586 our opened sockets don't match what we expected. Fixes bug 9400;
19587 bugfix on 0.0.2pre7. Found by Coverity.
19588 - Correctly store microdescriptors and extrainfo descriptors that
19589 include an internal NUL byte. Fixes bug 8037; bugfix on
19590 0.2.0.1-alpha. Bug reported by "cypherpunks".
19591 - If for some reason we fail to write a microdescriptor while
19592 rebuilding the cache, do not let the annotations from that
19593 microdescriptor linger in the cache file, and do not let the
19594 microdescriptor stay recorded as present in its old location.
19595 Fixes bug 9047; bugfix on 0.2.2.6-alpha.
19596 - Use direct writes rather than stdio when building microdescriptor
19597 caches, in an attempt to mitigate bug 8031, or at least make it
19600 o Minor fixes (config options):
19601 - Warn and fail if a server is configured not to advertise any
19602 ORPorts at all. (We need *something* to put in our descriptor,
19603 or we just won't work.)
19604 - Behave correctly when the user disables LearnCircuitBuildTimeout
19605 but doesn't tell us what they would like the timeout to be. Fixes
19606 bug 6304; bugfix on 0.2.2.14-alpha.
19607 - Rename the (internal-use-only) UsingTestingNetworkDefaults option
19608 to start with a triple-underscore so the controller won't touch it.
19609 Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
19610 - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
19611 so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
19612 - When autodetecting the number of CPUs, use the number of available
19613 CPUs in preference to the number of configured CPUs. Inform the
19614 user if this reduces the number of available CPUs. Fixes bug 8002;
19615 bugfix on 0.2.3.1-alpha.
19616 - Command-line option "--version" implies "--quiet". Fixes bug 6997.
19617 - Make it an error when you set EntryNodes but disable UseGuardNodes,
19618 since it will (surprisingly to some users) ignore EntryNodes. Fixes
19619 bug 8180; bugfix on 0.2.3.11-alpha.
19620 - Avoid overflows when the user sets MaxCircuitDirtiness to a
19621 ridiculously high value, by imposing a (ridiculously high) 30-day
19622 maximum on MaxCircuitDirtiness.
19624 o Minor bugfixes (control protocol):
19625 - Stop sending a stray "(null)" in some cases for the server status
19626 "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
19628 - The ADDRMAP command can no longer generate an ill-formed error
19629 code on a failed MAPADDRESS. It now says "internal" rather than
19630 an English sentence fragment with spaces in the middle. Bugfix on
19631 Tor 0.2.0.19-alpha.
19633 o Minor bugfixes (clients / edges):
19634 - When we receive a RELAY_END cell with the reason DONE, or with no
19635 reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
19636 status as "connection refused". Previously we reported these cases
19637 as success but then immediately closed the connection. Fixes bug
19638 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
19639 - If the guard we choose first doesn't answer, we would try the
19640 second guard, but once we connected to the second guard we would
19641 abandon it and retry the first one, slowing down bootstrapping.
19642 The fix is to treat all our initially chosen guards as acceptable
19643 to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
19644 - When choosing which stream on a formerly stalled circuit to wake
19645 first, make better use of the platform's weak RNG. Previously,
19646 we had been using the % ("modulo") operator to try to generate a
19647 1/N chance of picking each stream, but this behaves badly with
19648 many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
19651 o Minor bugfixes (path bias detection):
19652 - If the state file's path bias counts are invalid (presumably from a
19653 buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
19654 additional checks and log messages to the scaling of Path Bias
19655 counts, in case there still are remaining issues with scaling.
19656 Should help resolve bug 8235.
19657 - Prevent rounding error in path bias counts when scaling
19658 them down, and use the correct scale factor default. Also demote
19659 some path bias related log messages down a level and make others
19660 less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
19661 - Remove a source of rounding error during path bias count scaling;
19662 don't count cannibalized circuits as used for path bias until we
19663 actually try to use them; and fix a circuit_package_relay_cell()
19664 warning message about n_chan==NULL. Fixes bug 7802.
19665 - Paste the description for PathBias parameters from the man
19666 page into or.h, so the code documents them too. Fixes bug 7982;
19667 bugfix on 0.2.3.17-beta.
19669 o Minor bugfixes (relays):
19670 - Stop trying to resolve our hostname so often (e.g. every time we
19671 think about doing a directory fetch). Now we reuse the cached
19672 answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
19673 and 2410 (bugfix on 0.1.2.2-alpha).
19674 - When examining the list of network interfaces to find our address,
19675 do not consider non-running or disabled network interfaces. Fixes
19676 bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
19678 o Minor bugfixes (blocking resistance):
19679 - Only disable TLS session ticket support when running as a TLS
19680 server. Now clients will blend better with regular Firefox
19681 connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
19683 o Minor bugfixes (IPv6):
19684 - Use square brackets around IPv6 addresses in numerous places
19685 that needed them, including log messages, HTTPS CONNECT proxy
19686 requests, TransportProxy statefile entries, and pluggable transport
19687 extra-info lines. Fixes bug 7011; patch by David Fifield.
19689 o Minor bugfixes (directory authorities):
19690 - Reject consensus votes with more than 64 known-flags. We aren't even
19691 close to that limit yet, and our code doesn't handle it correctly.
19692 Fixes bug 6833; bugfix on 0.2.0.1-alpha.
19693 - Correctly handle votes with more than 31 flags. Fixes bug 6853;
19694 bugfix on 0.2.0.3-alpha.
19696 o Minor bugfixes (memory leaks):
19697 - Avoid leaking memory if we fail to compute a consensus signature
19698 or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
19699 - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
19700 on 0.2.1.1-alpha; fixes bug 7816.
19701 - Fix a memory leak during safe-cookie controller authentication.
19702 Bugfix on 0.2.3.13-alpha; fixes bug 7816.
19703 - Free some more still-in-use memory at exit, to make hunting for
19704 memory leaks easier. Resolves bug 7029.
19706 o Minor bugfixes (code correctness):
19707 - Increase the width of the field used to remember a connection's
19708 link protocol version to two bytes. Harmless for now, since the
19709 only currently recognized versions are one byte long. Reported
19710 pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
19711 - Fix a crash when debugging unit tests on Windows: deallocate a
19712 shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
19713 bugfix on 0.2.2.17-alpha. Reported by "ultramage".
19714 - When detecting the largest possible file descriptor (in order to
19715 close all file descriptors when launching a new program), actually
19716 use _SC_OPEN_MAX. The old code for doing this was very, very broken.
19717 Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
19719 - Avoid a crash if we fail to generate an extrainfo descriptor.
19720 Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
19721 this is CID 718634.
19722 - Avoid an off-by-one error when checking buffer boundaries when
19723 formatting the exit status of a pluggable transport helper.
19724 This is probably not an exploitable bug, but better safe than
19725 sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
19727 - Get rid of a couple of harmless clang warnings, where we compared
19728 enums to ints. These warnings are newly introduced in clang 3.2.
19730 o Minor bugfixes (code cleanliness):
19731 - Avoid use of reserved identifiers in our C code. The C standard
19732 doesn't like us declaring anything that starts with an
19733 underscore, so let's knock it off before we get in trouble. Fix
19734 for bug 1031; bugfix on the first Tor commit.
19735 - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
19736 with large values. This situation was untriggered, but nevertheless
19737 incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
19738 - Fix an impossible buffer overrun in the AES unit tests. Fixes
19739 bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
19740 - Fix handling of rendezvous client authorization types over 8.
19741 Fixes bug 6861; bugfix on 0.2.1.5-alpha.
19742 - Remove a couple of extraneous semicolons that were upsetting the
19743 cparser library. Patch by Christian Grothoff. Fixes bug 7115;
19744 bugfix on 0.2.2.1-alpha.
19745 - When complaining about a client port on a public address, log
19746 which address we're complaining about. Fixes bug 4020; bugfix on
19747 0.2.3.3-alpha. Patch by Tom Fitzhenry.
19749 o Minor bugfixes (log messages, warnings):
19750 - If we encounter a write failure on a SOCKS connection before we
19751 finish our SOCKS handshake, don't warn that we closed the
19752 connection before we could send a SOCKS reply. Fixes bug 8427;
19753 bugfix on 0.1.0.1-rc.
19754 - Fix a directory authority warn caused when we have a large amount
19755 of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
19756 - Downgrade "Failed to hand off onionskin" messages to "debug"
19757 severity, since they're typically redundant with the "Your computer
19758 is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
19759 - Avoid spurious warnings when configuring multiple client ports of
19760 which only some are nonlocal. Previously, we had claimed that some
19761 were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
19764 o Minor bugfixes (log messages, other):
19765 - Fix log messages and comments to avoid saying "GMT" when we mean
19766 "UTC". Fixes bug 6113.
19767 - When rejecting a configuration because we were unable to parse a
19768 quoted string, log an actual error message. Fixes bug 7950; bugfix
19770 - Correctly recognize that [::1] is a loopback address. Fixes
19771 bug 8377; bugfix on 0.2.1.3-alpha.
19772 - Don't log inappropriate heartbeat messages when hibernating: a
19773 hibernating node is _expected_ to drop out of the consensus,
19774 decide it isn't bootstrapped, and so forth. Fixes bug 7302;
19775 bugfix on 0.2.3.1-alpha.
19776 - Eliminate several instances where we use "Nickname=ID" to refer to
19777 nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
19778 "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
19781 o Minor bugfixes (build):
19782 - Fix some bugs in tor-fw-helper-natpmp when trying to build and
19783 run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
19784 Fixes bug 7280; bugfix on 0.2.3.1-alpha.
19786 o Documentation fixes:
19787 - Make the torify manpage no longer refer to tsocks; torify hasn't
19788 supported tsocks since 0.2.3.14-alpha.
19789 - Make the tor manpage no longer reference tsocks.
19790 - Fix the GeoIPExcludeUnknown documentation to refer to
19791 ExcludeExitNodes rather than the currently nonexistent
19792 ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
19793 - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
19795 - Say "KBytes" rather than "KB" in the man page (for various values
19796 of K), to further reduce confusion about whether Tor counts in
19797 units of memory or fractions of units of memory. Resolves ticket 7054.
19798 - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
19799 names match. Fixes bug 7768.
19800 - Fix the documentation of HeartbeatPeriod to say that the heartbeat
19801 message is logged at notice, not at info.
19802 - Clarify the usage and risks of setting the ContactInfo torrc line
19803 for your relay or bridge. Resolves ticket 9854.
19804 - Add anchors to the manpage so we can link to the html version of
19805 the documentation for specific options. Resolves ticket 9866.
19806 - Replace remaining references to DirServer in man page and
19807 log entries. Resolves ticket 10124.
19809 o Removed features:
19810 - Stop exporting estimates of v2 and v3 directory traffic shares
19811 in extrainfo documents. They were unneeded and sometimes inaccurate.
19812 Also stop exporting any v2 directory request statistics. Resolves
19814 - Drop support for detecting and warning about versions of Libevent
19815 before 1.3e. Nothing reasonable ships with them any longer; warning
19816 the user about them shouldn't be needed. Resolves ticket 6826.
19817 - Now that all versions before 0.2.2.x are disallowed, we no longer
19818 need to work around their missing features. Remove a bunch of
19819 compatibility code.
19822 - The tor-tsocks.conf is no longer distributed or installed. We
19823 recommend that tsocks users use torsocks instead. Resolves
19825 - Remove some of the older contents of doc/ as obsolete; move others
19826 to torspec.git. Fixes bug 8965.
19828 o Code simplification:
19829 - Avoid using character buffers when constructing most directory
19830 objects: this approach was unwieldy and error-prone. Instead,
19831 build smartlists of strings, and concatenate them when done.
19832 - Rename "isin" functions to "contains", for grammar. Resolves
19834 - Rename Tor's logging function log() to tor_log(), to avoid conflicts
19835 with the natural logarithm function from the system libm. Resolves
19837 - Start using OpenBSD's implementation of queue.h, so that we don't
19838 need to hand-roll our own pointer and list structures whenever we
19839 need them. (We can't rely on a sys/queue.h, since some operating
19840 systems don't have them, and the ones that do have them don't all
19841 present the same extensions.)
19842 - Start using OpenBSD's implementation of queue.h (originally by
19844 - Enhance our internal sscanf replacement so that we can eliminate
19845 the last remaining uses of the system sscanf. (Though those uses
19846 of sscanf were safe, sscanf itself is generally error prone, so
19847 we want to eliminate when we can.) Fixes ticket 4195 and Coverity
19849 - Replace all calls to snprintf() outside of src/ext with
19850 tor_snprintf(). Also remove the #define to replace snprintf with
19851 _snprintf on Windows; they have different semantics, and all of
19852 our callers should be using tor_snprintf() anyway. Fixes bug 7304.
19855 - Add a wrapper function for the common "log a message with a
19857 - Split the onion.c file into separate modules for the onion queue
19858 and the different handshakes it supports.
19859 - Move the client-side address-map/virtual-address/DNS-cache code
19860 out of connection_edge.c into a new addressmap.c module.
19861 - Move the entry node code from circuitbuild.c to its own file.
19862 - Move the circuit build timeout tracking code from circuitbuild.c
19864 - Source files taken from other packages now reside in src/ext;
19865 previously they were scattered around the rest of Tor.
19866 - Move the generic "config" code into a new file, and have "config.c"
19867 hold only torrc- and state-related code. Resolves ticket 6823.
19868 - Move the core of our "choose a weighted element at random" logic
19869 into its own function, and give it unit tests. Now the logic is
19870 testable, and a little less fragile too.
19871 - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
19872 - Move last_reachable and testing_since from routerinfo_t to node_t.
19873 Implements ticket 5529.
19874 - Add replaycache_t structure, functions and unit tests, then refactor
19875 rend_service_introduce() to be more clear to read, improve, debug,
19876 and test. Resolves bug 6177.
19879 - Remove some now-needless code that tried to aggressively flush
19880 OR connections as data was added to them. Since 0.2.0.1-alpha, our
19881 cell queue logic has saved us from the failure mode that this code
19882 was supposed to prevent. Removing this code will limit the number
19883 of baroque control flow paths through Tor's network logic. Reported
19884 pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
19885 - Remove unused code for parsing v1 directories and "running routers"
19886 documents. Fixes bug 6887.
19887 - Remove the marshalling/unmarshalling code for sending requests to
19888 cpuworkers over a socket, and instead just send structs. The
19889 recipient will always be the same Tor binary as the sender, so
19890 any encoding is overkill.
19891 - Remove the testing_since field of node_t, which hasn't been used
19892 for anything since 0.2.0.9-alpha.
19893 - Finally remove support for malloc_good_size and malloc_usable_size.
19894 We had hoped that these functions would let us eke a little more
19895 memory out of our malloc implementation. Unfortunately, the only
19896 implementations that provided these functions are also ones that
19897 are already efficient about not overallocation: they never got us
19898 more than 7 or so bytes per allocation. Removing them saves us a
19899 little code complexity and a nontrivial amount of build complexity.
19902 Changes in version 0.2.3.25 - 2012-11-19
19903 The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
19904 Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
19905 Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
19906 programmer, and friend. Unstinting in his dedication to the cause of
19907 freedom, he inspired and helped many of us as we began our work on
19908 anonymity, and inspires us still. Please honor his memory by writing
19909 software to protect people's freedoms, and by helping others to do so.
19911 Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
19912 significantly reduced directory overhead (via microdescriptors),
19913 enormous crypto performance improvements for fast relays on new
19914 enough hardware, a new v3 TLS handshake protocol that can better
19915 resist fingerprinting, support for protocol obfuscation plugins (aka
19916 pluggable transports), better scalability for hidden services, IPv6
19917 support for bridges, performance improvements like allowing clients
19918 to skip the first round-trip on the circuit ("optimistic data") and
19919 refilling token buckets more often, a new "stream isolation" design
19920 to isolate different applications on different circuits, and many
19921 stability, security, and privacy fixes.
19923 Major features (v3 directory protocol):
19924 - Clients now use microdescriptors instead of regular descriptors
19925 to build circuits. Microdescriptors are authority-generated
19926 summaries of regular descriptors' contents, designed to change very
19927 rarely (see proposal 158 for details). This feature is designed
19928 to save bandwidth, especially for clients on slow internet
19929 connections. Use "UseMicrodescriptors 0" to disable it.
19930 - Caches now download, cache, and serve microdescriptors, as well
19931 as multiple "flavors" of the consensus, including a flavor that
19932 describes microdescriptors.
19934 o Major features (build hardening):
19935 - Enable gcc and ld hardening by default. Resolves ticket 5210.
19937 o Major features (relay scaling):
19938 - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
19939 instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
19940 vectorized AES implementations as appropriate. These can be much,
19941 much faster than other AES implementations.
19942 - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
19943 implementation. It makes AES_CTR about 7% faster than our old one
19944 (which was about 10% faster than the one OpenSSL used to provide).
19945 Resolves ticket 4526.
19946 - Use OpenSSL's EVP interface for AES encryption, so that all AES
19947 operations can use hardware acceleration (if present). Resolves
19949 - Unconditionally use OpenSSL's AES implementation instead of our
19950 old built-in one. OpenSSL's AES has been better for a while, and
19951 relatively few servers should still be on any version of OpenSSL
19952 that doesn't have good optimized assembly AES.
19954 o Major features (blocking resistance):
19955 - Update TLS cipher list to match Firefox 8 and later. Resolves
19957 - Remove support for clients falsely claiming to support standard
19958 ciphersuites that they can actually provide. As of modern OpenSSL
19959 versions, it's not necessary to fake any standard ciphersuite,
19960 and doing so prevents us from using better ciphersuites in the
19961 future, since servers can't know whether an advertised ciphersuite
19962 is really supported or not. Some hosts -- notably, ones with very
19963 old versions of OpenSSL or where OpenSSL has been built with ECC
19964 disabled -- will stand out because of this change; TBB users should
19965 not be affected. Implements the client side of proposal 198.
19966 - Implement a new handshake protocol (v3) for authenticating Tors to
19967 each other over TLS. It should be more resistant to fingerprinting
19968 than previous protocols, and should require less TLS hacking for
19969 future Tor implementations. Implements proposal 176.
19970 - Allow variable-length padding cells, to disguise the length of
19971 Tor's TLS records. Implements part of proposal 184.
19972 - While we're trying to bootstrap, record how many TLS connections
19973 fail in each state, and report which states saw the most failures
19974 in response to any bootstrap failures. This feature may speed up
19975 diagnosis of censorship events. Implements ticket 3116.
19977 o Major features (pluggable transports):
19978 - Clients and bridges can now be configured to use a separate
19979 "transport" proxy. This approach makes the censorship arms race
19980 easier by allowing bridges to use protocol obfuscation plugins.
19981 Implements proposal 180 (tickets 2841 and 3472).
19983 o Major features (DoS resistance):
19984 - Now that Tor 0.2.0.x is completely deprecated, enable the final
19985 part of "Proposal 110: Avoiding infinite length circuits" by
19986 refusing all circuit-extend requests that do not use a relay_early
19987 cell. This change helps Tor resist a class of denial-of-service
19988 attacks by limiting the maximum circuit length.
19989 - Tear down the circuit if we get an unexpected SENDME cell. Clients
19990 could use this trick to make their circuits receive cells faster
19991 than our flow control would have allowed, or to gum up the network,
19992 or possibly to do targeted memory denial-of-service attacks on
19993 entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
19994 from July 2002, before the release of Tor 0.0.0.
19996 o Major features (hidden services):
19997 - Adjust the number of introduction points that a hidden service
19998 will try to maintain based on how long its introduction points
19999 remain in use and how many introductions they handle. Fixes
20001 - Add a "tor2web mode" for clients that want to connect to hidden
20002 services non-anonymously (and possibly more quickly). As a safety
20003 measure to try to keep users from turning this on without knowing
20004 what they are doing, tor2web mode must be explicitly enabled at
20005 compile time, and a copy of Tor compiled to run in tor2web mode
20006 cannot be used as a normal Tor client. Implements feature 2553.
20008 o Major features (IPv6):
20009 - Clients can now connect to private bridges over IPv6. Bridges
20010 still need at least one IPv4 address in order to connect to
20011 other relays. Note that we don't yet handle the case where the
20012 user has two bridge lines for the same bridge (one IPv4, one
20013 IPv6). Implements parts of proposal 186.
20015 o Major features (directory authorities):
20016 - Use a more secure consensus parameter voting algorithm. Now at
20017 least three directory authorities or a majority of them must
20018 vote on a given parameter before it will be included in the
20019 consensus. Implements proposal 178.
20020 - Remove the artificially low cutoff of 20KB to guarantee the Fast
20021 flag. In the past few years the average relay speed has picked
20022 up, and while the "top 7/8 of the network get the Fast flag" and
20023 "all relays with 20KB or more of capacity get the Fast flag" rules
20024 used to have the same result, now the top 7/8 of the network has
20025 a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
20027 o Major features (performance):
20028 - Exit nodes now accept and queue data on not-yet-connected streams.
20029 Previously, the client wasn't allowed to send data until the
20030 stream was connected, which slowed down all connections. This
20031 change will enable clients to perform a "fast-start" on streams
20032 and send data without having to wait for a confirmation that the
20033 stream has opened. Patch from Ian Goldberg; implements the server
20034 side of Proposal 174.
20035 - When using an exit relay running 0.2.3.x, clients can now
20036 "optimistically" send data before the exit relay reports that
20037 the stream has opened. This saves a round trip when starting
20038 connections where the client speaks first (such as web browsing).
20039 This behavior is controlled by a consensus parameter (currently
20040 disabled). To turn it on or off manually, use the "OptimisticData"
20041 torrc option. Implements proposal 181; code by Ian Goldberg.
20042 - Add a new TokenBucketRefillInterval option to refill token buckets
20043 more frequently than once per second. This should improve network
20044 performance, alleviate queueing problems, and make traffic less
20045 bursty. Implements proposal 183; closes ticket 3630. Design by
20046 Florian Tschorsch and Björn Scheuermann; implementation by
20048 - Raise the threshold of server descriptors needed (75%) and exit
20049 server descriptors needed (50%) before we will declare ourselves
20050 bootstrapped. This will make clients start building circuits a
20051 little later, but makes the initially constructed circuits less
20052 skewed and less in conflict with further directory fetches. Fixes
20055 o Major features (relays):
20056 - Relays now try regenerating and uploading their descriptor more
20057 frequently if they are not listed in the consensus, or if the
20058 version of their descriptor listed in the consensus is too
20059 old. This fix should prevent situations where a server declines
20060 to re-publish itself because it has done so too recently, even
20061 though the authorities decided not to list its recent-enough
20062 descriptor. Fix for bug 3327.
20064 o Major features (stream isolation):
20065 - You can now configure Tor so that streams from different
20066 applications are isolated on different circuits, to prevent an
20067 attacker who sees your streams as they leave an exit node from
20068 linking your sessions to one another. To do this, choose some way
20069 to distinguish the applications: have them connect to different
20070 SocksPorts, or have one of them use SOCKS4 while the other uses
20071 SOCKS5, or have them pass different authentication strings to the
20072 SOCKS proxy. Then, use the new SocksPort syntax to configure the
20073 degree of isolation you need. This implements Proposal 171.
20074 - There's a new syntax for specifying multiple client ports (such as
20075 SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
20076 multiple *Port entries with full addr:port syntax on each.
20077 The old *ListenAddress format is still supported, but you can't
20078 mix it with the new *Port syntax.
20080 o Major features (bufferevents):
20081 - Tor can now optionally build with the "bufferevents" buffered IO
20082 backend provided by Libevent 2. To use this feature, make sure you
20083 have the latest possible version of Libevent, and pass the
20084 --enable-bufferevents flag to configure when building Tor from
20085 source. This feature will make our networking code more flexible,
20086 let us stack layers on each other, and let us use more efficient
20087 zero-copy transports where available.
20088 - Add experimental support for running on Windows with IOCP and no
20089 kernel-space socket buffers. This feature is controlled by a new
20090 "UserspaceIOCPBuffers" config option (off by default), which has
20091 no effect unless Tor has been built with bufferevents enabled,
20092 you're running on Windows, and you've set "DisableIOCP 0". In the
20093 long run, this may help solve or mitigate bug 98.
20095 o Major features (path selection):
20096 - The EntryNodes option can now include country codes like {de} or IP
20097 addresses or network masks. Previously we had disallowed these
20098 options because we didn't have an efficient way to keep the list up
20099 to date. Addresses ticket 1982, but see bug 2798 for an unresolved
20102 o Major features (port forwarding):
20103 - Add support for automatic port mapping on the many home routers
20104 that support NAT-PMP or UPnP. To build the support code, you'll
20105 need to have the libnatpnp library and/or the libminiupnpc library,
20106 and you'll need to enable the feature specifically by passing
20107 "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
20108 it on, use the new PortForwarding option.
20110 o Major features (logging):
20111 - Add a new 'Heartbeat' log message type to periodically log a message
20112 describing Tor's status at level Notice. This feature is meant for
20113 operators who log at notice, and want to make sure that their Tor
20114 server is still working. Implementation by George Kadianakis.
20115 - Make logging resolution configurable with a new LogTimeGranularity
20116 option, and change the default from 1 millisecond to 1 second.
20117 Implements enhancement 1668.
20119 o Major features (other):
20120 - New "DisableNetwork" config option to prevent Tor from launching any
20121 connections or accepting any connections except on a control port.
20122 Bundles and controllers can set this option before letting Tor talk
20123 to the rest of the network, for example to prevent any connections
20124 to a non-bridge address. Packages like Orbot can also use this
20125 option to instruct Tor to save power when the network is off.
20126 - Try to use system facilities for enumerating local interface
20127 addresses, before falling back to our old approach (which was
20128 binding a UDP socket, and calling getsockname() on it). That
20129 approach was scaring OS X users whose draconian firewall
20130 software warned about binding to UDP sockets regardless of
20131 whether packets were sent. Now we try to use getifaddrs(),
20132 SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
20133 system supports. Resolves ticket 1827.
20134 - Add experimental support for a "defaults" torrc file to be parsed
20135 before the regular torrc. Torrc options override the defaults file's
20136 options in the same way that the command line overrides the torrc.
20137 The SAVECONF controller command saves only those options which
20138 differ between the current configuration and the defaults file. HUP
20139 reloads both files. Implements task 4552.
20141 o New directory authorities:
20142 - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
20143 authority. Closes ticket 5749.
20145 o Security/privacy fixes:
20146 - Avoid read-from-freed-memory and double-free bugs that could occur
20147 when a DNS request fails while launching it. Fixes bug 6480;
20148 bugfix on 0.2.0.1-alpha.
20149 - Reject any attempt to extend to an internal address. Without
20150 this fix, a router could be used to probe addresses on an internal
20151 network to see whether they were accepting connections. Fixes bug
20152 6710; bugfix on 0.0.8pre1.
20153 - Close any connection that sends unrecognized junk before the TLS
20154 handshake. Solves an issue noted in bug 4369.
20155 - The advertised platform of a relay now includes only its operating
20156 system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
20157 its service pack level (for Windows) or its CPU architecture
20158 (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
20159 can insert an extra string in the platform line by setting the
20160 preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
20161 - Disable TLS session tickets. OpenSSL's implementation was giving
20162 our TLS session keys the lifetime of our TLS context objects, when
20163 perfect forward secrecy would want us to discard anything that
20164 could decrypt a link connection as soon as the link connection
20165 was closed. Fixes bug 7139; bugfix on all versions of Tor linked
20166 against OpenSSL 1.0.0 or later. Found by Florent Daignière.
20167 - Tor tries to wipe potentially sensitive data after using it, so
20168 that if some subsequent security failure exposes Tor's memory,
20169 the damage will be limited. But we had a bug where the compiler
20170 was eliminating these wipe operations when it decided that the
20171 memory was no longer visible to a (correctly running) program,
20172 hence defeating our attempt at defense in depth. We fix that
20173 by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
20174 is unlikely to optimize away. Future versions of Tor may use
20175 a less ridiculously heavy approach for this. Fixes bug 7352.
20176 Reported in an article by Andrey Karpov.
20178 o Major bugfixes (crashes and asserts):
20179 - Avoid a pair of double-free and use-after-mark bugs that can
20180 occur with certain timings in canceled and re-received DNS
20181 requests. Fixes bug 6472; bugfix on 0.0.7rc1.
20182 - Fix a denial of service attack by which any directory authority
20183 could crash all the others, or by which a single v2 directory
20184 authority could crash everybody downloading v2 directory
20185 information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
20186 - Fix an assert that directory authorities could trigger on sighup
20187 during some configuration state transitions. We now don't treat
20188 it as a fatal error when the new descriptor we just generated in
20189 init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
20190 - Avoid segfault when starting up having run with an extremely old
20191 version of Tor and parsing its state file. Fixes bug 6801; bugfix
20194 o Major bugfixes (clients):
20195 - If we are unable to find any exit that supports our predicted ports,
20196 stop calling them predicted, so that we don't loop and build
20197 hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
20198 which introduced predicted ports.
20199 - Check at each new consensus whether our entry guards were picked
20200 long enough ago that we should rotate them. Previously, we only
20201 did this check at startup, which could lead to us holding a guard
20202 indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
20203 - When fetching a bridge descriptor from a bridge authority,
20204 always do so anonymously, whether we have been able to open
20205 circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
20206 This behavior makes it *safer* to use UpdateBridgesFromAuthority,
20207 but we'll need to wait for bug 6010 before it's actually usable.
20209 o Major bugfixes (directory voting):
20210 - Check more thoroughly to prevent a rogue authority from
20211 double-voting on any consensus directory parameter. Previously,
20212 authorities would crash in this case if the total number of
20213 votes for any parameter exceeded the number of active voters,
20214 but would let it pass otherwise. Partially fixes bug 5786; bugfix
20216 - When computing weight parameters, behave more robustly in the
20217 presence of a bad bwweightscale value. Previously, the authorities
20218 would crash if they agreed on a sufficiently broken weight_scale
20219 value; now, they use a reasonable default and carry on. Fixes the
20220 rest of bug 5786; bugfix on 0.2.2.17-alpha.
20221 - If authorities are unable to get a v2 consensus document from other
20222 directory authorities, they no longer fall back to fetching
20223 them from regular directory caches. Fixes bug 5635; bugfix on
20224 0.2.2.26-beta, where routers stopped downloading v2 consensus
20225 documents entirely.
20227 o Major bugfixes (relays):
20228 - Fix a bug handling SENDME cells on nonexistent streams that could
20229 result in bizarre window values. Report and patch contributed
20230 pseudonymously. Fixes part of bug 6271. This bug was introduced
20231 before the first Tor release, in svn commit r152.
20232 - Don't update the AccountingSoftLimitHitAt state file entry whenever
20233 tor gets started. This prevents a wrong average bandwidth
20234 estimate, which would cause relays to always start a new accounting
20235 interval at the earliest possible moment. Fixes bug 2003; bugfix
20236 on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
20237 immensely in tracking this bug down.
20238 - Fix a possible crash bug when checking for deactivated circuits
20239 in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
20240 bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
20241 - Set the SO_REUSEADDR socket option before we call bind() on outgoing
20242 connections. This change should allow busy exit relays to stop
20243 running out of available sockets as quickly. Fixes bug 4950;
20244 bugfix on 0.2.2.26-beta.
20246 o Major bugfixes (blocking resistance):
20247 - Bridges no longer include their address in NETINFO cells on outgoing
20248 OR connections, to allow them to blend in better with clients.
20249 Removes another avenue for enumerating bridges. Reported by
20250 "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
20251 cells were introduced.
20252 - Warn the user when HTTPProxy, but no other proxy type, is
20253 configured. This can cause surprising behavior: it doesn't send
20254 all of Tor's traffic over the HTTPProxy -- it sends unencrypted
20255 directory traffic only. Resolves ticket 4663.
20257 o Major bugfixes (hidden services):
20258 - Improve hidden service robustness: when an attempt to connect to
20259 a hidden service ends, be willing to refetch its hidden service
20260 descriptors from each of the HSDir relays responsible for them
20261 immediately. Previously, we would not consider refetching the
20262 service's descriptors from each HSDir for 15 minutes after the last
20263 fetch, which was inconvenient if the hidden service was not running
20264 during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
20265 - Hidden services now ignore the timestamps on INTRODUCE2 cells.
20266 They used to check that the timestamp was within 30 minutes
20267 of their system clock, so they could cap the size of their
20268 replay-detection cache, but that approach unnecessarily refused
20269 service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
20270 the v3 intro-point protocol (the first one which sent a timestamp
20271 field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
20272 - When one of a hidden service's introduction points appears to be
20273 unreachable, stop trying it. Previously, we would keep trying
20274 to build circuits to the introduction point until we lost the
20275 descriptor, usually because the user gave up and restarted Tor.
20276 Fixes part of bug 3825.
20278 o Changes to default torrc file:
20279 - Stop listing "socksport 9050" in torrc.sample. We open a socks
20280 port on 9050 by default anyway, so this should not change anything
20282 - Stop mentioning the deprecated *ListenAddress options in
20283 torrc.sample. Fixes bug 5438.
20284 - Document unit of bandwidth-related options in sample torrc.
20286 - Fix broken URLs in the sample torrc file, and tell readers about
20287 the OutboundBindAddress, ExitPolicyRejectPrivate, and
20288 PublishServerDescriptor options. Addresses bug 4652.
20290 o Minor features (directory authorities):
20291 - Consider new, removed or changed IPv6 OR ports a non-cosmetic
20292 change when the authority is deciding whether to accept a newly
20293 uploaded descriptor. Implements ticket 6423.
20294 - Directory authorities are now a little more lenient at accepting
20295 older router descriptors, or newer router descriptors that don't
20296 make big changes. This should help ameliorate past and future
20297 issues where routers think they have uploaded valid descriptors,
20298 but the authorities don't think so. Fix for ticket 2479.
20299 - Authority operators can now vote for all relays in a given
20300 set of countries to be BadDir/BadExit/Invalid/Rejected.
20301 - Provide two consensus parameters (FastFlagMinThreshold and
20302 FastFlagMaxThreshold) to control the range of allowable bandwidths
20303 for the Fast directory flag. These allow authorities to run
20304 experiments on appropriate requirements for being a "Fast" node.
20305 The AuthDirFastGuarantee config value still applies. Implements
20308 o Minor features (bridges / bridge authorities):
20309 - Make bridge SSL certificates a bit more stealthy by using random
20310 serial numbers, in the same fashion as OpenSSL when generating
20311 self-signed certificates. Implements ticket 4584.
20312 - Tag a bridge's descriptor as "never to be sent unencrypted".
20313 This shouldn't matter, since bridges don't open non-anonymous
20314 connections to the bridge authority and don't allow unencrypted
20315 directory connections from clients, but we might as well make
20316 sure. Closes bug 5139.
20317 - The Bridge Authority now writes statistics on how many bridge
20318 descriptors it gave out in total, and how many unique descriptors
20319 it gave out. It also lists how often the most and least commonly
20320 fetched descriptors were given out, as well as the median and
20321 25th/75th percentile. Implements tickets 4200 and 4294.
20323 o Minor features (IPv6):
20324 - Make the code that clients use to detect an address change be
20325 IPv6-aware, so that it won't fill clients' logs with error
20326 messages when trying to get the IPv4 address of an IPv6
20327 connection. Implements ticket 5537.
20328 - Relays now understand an IPv6 address when they get one from a
20329 directory server. Resolves ticket 4875.
20331 o Minor features (hidden services):
20332 - Expire old or over-used hidden service introduction points.
20333 Required by fix for bug 3460.
20334 - Reduce the lifetime of elements of hidden services' Diffie-Hellman
20335 public key replay-detection cache from 60 minutes to 5 minutes. This
20336 replay-detection cache is now used only to detect multiple
20337 INTRODUCE2 cells specifying the same rendezvous point, so we can
20338 avoid launching multiple simultaneous attempts to connect to it.
20339 - When a hidden service's introduction point times out, consider
20340 trying it again during the next attempt to connect to the
20341 HS. Previously, we would not try it again unless a newly fetched
20342 descriptor contained it. Required by fixes for bugs 1297 and 3825.
20344 o Minor features (relays):
20345 - Relays now include a reason for regenerating their descriptors
20346 in an HTTP header when uploading to the authorities. This will
20347 make it easier to debug descriptor-upload issues in the future.
20348 - Turn on directory request statistics by default and include them in
20349 extra-info descriptors. Don't break if we have no GeoIP database.
20350 - Replace files in stats/ rather than appending to them. Now that we
20351 include statistics in extra-info descriptors, it makes no sense to
20352 keep old statistics forever. Implements ticket 2930.
20353 - Relays that set "ConnDirectionStatistics 1" write statistics on the
20354 bidirectional use of connections to disk every 24 hours.
20355 - Add a GeoIP file digest to the extra-info descriptor. Implements
20358 o Minor features (new config options):
20359 - New config option "DynamicDHGroups" (disabled by default) provides
20360 each bridge with a unique prime DH modulus to be used during
20361 SSL handshakes. This option attempts to help against censors
20362 who might use the Apache DH modulus as a static identifier for
20363 bridges. Addresses ticket 4548.
20364 - New config option "DisableDebuggerAttachment" (on by default)
20365 to prevent basic debugging attachment attempts by other processes.
20366 Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
20367 - Ordinarily, Tor does not count traffic from private addresses (like
20368 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
20369 There is now a new option, CountPrivateBandwidth, to disable this
20370 behavior. Patch from Daniel Cagara.
20372 o Minor features (different behavior for old config options):
20373 - Allow MapAddress directives to specify matches against super-domains,
20374 as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
20375 Implements issue 933.
20376 - Don't disable the DirPort when we cannot exceed our AccountingMax
20377 limit during this interval because the effective bandwidthrate is
20378 low enough. This is useful in a situation where AccountMax is only
20379 used as an additional safeguard or to provide statistics.
20380 - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
20381 implements ticket 3439.
20382 - When configuring a large set of nodes in EntryNodes, and there are
20383 enough of them listed as Guard so that we don't need to consider
20384 the non-guard entries, prefer the ones listed with the Guard flag.
20385 - If you set the NumCPUs option to 0, Tor will now try to detect how
20386 many CPUs you have. This is the new default behavior.
20387 - The NodeFamily option -- which let you declare that you want to
20388 consider nodes to be part of a family whether they list themselves
20389 that way or not -- now allows IP address ranges and country codes.
20391 o Minor features (new command-line config behavior):
20392 - Slightly change behavior of "list" options (that is, config
20393 options that can appear more than once) when they appear both in
20394 torrc and on the command line. Previously, the command-line options
20395 would be appended to the ones from torrc. Now, the command-line
20396 options override the torrc options entirely. This new behavior
20397 allows the user to override list options (like exit policies and
20398 ports to listen on) from the command line, rather than simply
20399 appending to the list.
20400 - You can get the old (appending) command-line behavior for "list"
20401 options by prefixing the option name with a "+".
20402 - You can remove all the values for a "list" option from the command
20403 line without adding any new ones by prefixing the option name
20406 o Minor features (controller, new events):
20407 - Extend the control protocol to report flags that control a circuit's
20408 path selection in CIRC events and in replies to 'GETINFO
20409 circuit-status'. Implements part of ticket 2411.
20410 - Extend the control protocol to report the hidden service address
20411 and current state of a hidden-service-related circuit in CIRC
20412 events and in replies to 'GETINFO circuit-status'. Implements part
20414 - Include the creation time of a circuit in CIRC and CIRC2
20415 control-port events and the list produced by the 'GETINFO
20416 circuit-status' control-port command.
20417 - Add a new CONF_CHANGED event so that controllers can be notified
20418 of any configuration changes made by other controllers, or by the
20419 user. Implements ticket 1692.
20420 - Add a new SIGNAL event to the controller interface so that
20421 controllers can be notified when Tor handles a signal. Resolves
20422 issue 1955. Patch by John Brooks.
20424 o Minor features (controller, new getinfo options):
20425 - Expose our view of whether we have gone dormant to the controller,
20426 via a new "GETINFO dormant" value. Torbutton and other controllers
20427 can use this to avoid doing periodic requests through Tor while
20428 it's dormant (bug 4718). Resolves ticket 5954.
20429 - Add a new GETINFO option to get total bytes read and written. Patch
20430 from pipe, revised by atagar. Resolves ticket 2345.
20431 - Implement new GETINFO controller fields to provide information about
20432 the Tor process's pid, euid, username, and resource limits.
20434 o Minor features (controller, other):
20435 - Allow controllers to request an event notification whenever a
20436 circuit is cannibalized or its purpose is changed. Implements
20437 part of ticket 3457.
20438 - Use absolute path names when reporting the torrc filename in the
20439 control protocol, so a controller can more easily find the torrc
20440 file. Resolves bug 1101.
20441 - When reporting the path to the cookie file to the controller,
20442 give an absolute path. Resolves ticket 4881.
20444 o Minor features (log messages):
20445 - Add more information to a log statement that might help track down
20446 bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
20447 non-IP address" messages (or any Bug messages, for that matter!),
20448 please let us know about it.
20449 - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
20450 EntryNodes will have no effect. Resolves issue 2571.
20451 - Try to make the introductory warning message that Tor prints on
20452 startup more useful for actually finding help and information.
20453 Resolves ticket 2474.
20454 - When the system call to create a listener socket fails, log the
20455 error message explaining why. This may help diagnose bug 4027.
20457 o Minor features (other):
20458 - When we fail to initialize Libevent, retry with IOCP disabled so we
20459 don't need to turn on multi-threading support in Libevent, which in
20460 turn requires a working socketpair(). This is a workaround for bug
20461 4457, which affects Libevent versions from 2.0.1-alpha through
20463 - When starting as root and then changing our UID via the User
20464 control option, and we have a ControlSocket configured, make sure
20465 that the ControlSocket is owned by the same account that Tor will
20466 run under. Implements ticket 3421; fix by Jérémy Bobbio.
20467 - Accept attempts to include a password authenticator in the
20468 handshake, as supported by SOCKS5. This handles SOCKS clients that
20469 don't know how to omit a password when authenticating. Resolves
20471 - Check for and recover from inconsistency in the microdescriptor
20472 cache. This will make it harder for us to accidentally free a
20473 microdescriptor without removing it from the appropriate data
20474 structures. Fixes issue 3135; issue noted by "wanoskarnet".
20475 - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
20477 o Minor bugfixes (code security):
20478 - Prevent a null-pointer dereference when receiving a data cell
20479 for a nonexistent stream when the circuit in question has an
20480 empty deliver window. We don't believe this is triggerable,
20481 since we don't currently allow deliver windows to become empty,
20482 but the logic is tricky enough that it's better to make the code
20483 robust. Fixes bug 5541; bugfix on 0.0.2pre14.
20484 - Fix a (harmless) integer overflow in cell statistics reported by
20485 some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
20486 - Fix our implementation of crypto_random_hostname() so it can't
20487 overflow on ridiculously large inputs. (No Tor version has ever
20488 provided this kind of bad inputs, but let's be correct in depth.)
20489 Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
20490 - Add a (probably redundant) memory clear between iterations of
20491 the router status voting loop, to prevent future coding errors
20492 where data might leak between iterations of the loop. Resolves
20495 o Minor bugfixes (wrapper functions):
20496 - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
20497 utility function used in the control-port code). This shouldn't
20498 ever happen unless Tor is completely out of memory, but if it did
20499 happen and Tor somehow recovered from it, Tor could have sent a log
20500 message to a control port in the middle of a reply to a controller
20501 command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
20502 - Fix some (not actually triggerable) buffer size checks in usage of
20503 tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
20505 - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
20506 bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
20507 - Enforce correct return behavior of tor_vsscanf() when the '%%'
20508 pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
20509 - Make our replacement implementation of strtok_r() compatible with
20510 the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
20511 bugfix on 0.2.2.1-alpha.
20512 - Find more places in the code that should have been testing for
20513 invalid sockets using the SOCKET_OK macro. Required for a fix
20514 for bug 4533. Bugfix on 0.2.2.28-beta.
20516 o Minor bugfixes (code correctness):
20517 - Check return value of fputs() when writing authority certificate
20518 file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
20519 - When building Tor on Windows with -DUNICODE (not default), ensure
20520 that error messages, filenames, and DNS server names are always
20521 NUL-terminated when we convert them to a single-byte encoding.
20522 Fixes bug 5909; bugfix on 0.2.2.16-alpha.
20523 - Fix a memory leak when trying to launch a DNS request when the
20524 nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
20526 - Correct file sizes when reading binary files on Cygwin, to avoid
20527 a bug where Tor would fail to read its state file. Fixes bug 6844;
20528 bugfix on 0.1.2.7-alpha.
20529 - Make sure to set *socket_error in all error cases in
20530 connection_connect(), so it can't produce a warning about
20531 errno being zero from errno_to_orconn_end_reason(). Bugfix on
20532 0.2.1.1-alpha; resolves ticket 6028.
20533 - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
20534 bug 4532; found by "troll_un".
20536 o Minor bugfixes (clients):
20537 - Allow one-hop directory-fetching circuits the full "circuit build
20538 timeout" period, rather than just half of it, before failing them
20539 and marking the relay down. This fix should help reduce cases where
20540 clients declare relays (or worse, bridges) unreachable because
20541 the TLS handshake takes a few seconds to complete. Fixes bug 6743;
20542 bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
20544 - Ensure we don't cannibalize circuits that are longer than three hops
20545 already, so we don't end up making circuits with 5 or more
20546 hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
20547 0.1.0.1-rc which introduced cannibalization.
20549 o Minor bugfixes (relays):
20550 - Don't publish a new relay descriptor when we reload our onion key,
20551 unless the onion key has actually changed. Fixes bug 3263 and
20552 resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
20553 - When relays refuse a "create" cell because their queue of pending
20554 create cells is too big (typically because their cpu can't keep up
20555 with the arrival rate), send back reason "resource limit" rather
20556 than reason "internal", so network measurement scripts can get a
20557 more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
20558 - Exit nodes don't need to fetch certificates for authorities that
20559 they don't recognize; only directory authorities, bridges,
20560 and caches need to do that. Fixes part of bug 2297; bugfix on
20563 o Minor bugfixes (directory authority / mirrors):
20564 - Avoid O(n^2) performance characteristics when parsing a large
20565 extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
20566 - Authorities no longer include any router in their microdescriptor
20567 consensuses for which they couldn't generate or agree on a
20568 microdescriptor. Fixes the second piece of bug 6404; fix on
20570 - When checking for requested signatures on the latest consensus
20571 before serving it to a client, make sure to check the right
20572 consensus flavor. Bugfix on 0.2.2.6-alpha.
20573 - Fix an edge case where TestingTorNetwork is set but the authorities
20574 and relays all have an uptime of zero, so the private Tor network
20575 could briefly lack support for hidden services. Fixes bug 3886;
20576 bugfix on 0.2.2.18-alpha.
20577 - Directory caches no longer refuse to clean out descriptors because
20578 of missing v2 networkstatus documents, unless they're configured
20579 to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
20580 0.2.2.26-beta. Patch by Daniel Bryg.
20581 - Don't serve or accept v2 hidden service descriptors over a relay's
20582 DirPort. It's never correct to do so, and disabling it might
20583 make it more annoying to exploit any bugs that turn up in the
20584 descriptor-parsing code. Fixes bug 7149.
20586 o Minor bugfixes (hidden services, client-side):
20587 - Assert that hidden-service-related operations are not performed
20588 using single-hop circuits. Previously, Tor would assert that
20589 client-side streams are not attached to single-hop circuits,
20590 but not that other sensitive operations on the client and service
20591 side are not performed using single-hop circuits. Fixes bug 3332;
20593 - Avoid undefined behavior when parsing the list of supported
20594 rendezvous/introduction protocols in a hidden service descriptor.
20595 Previously, Tor would have confused (as-yet-unused) protocol version
20596 numbers greater than 32 with lower ones on many platforms. Fixes
20597 bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
20598 - Don't close hidden service client circuits which have almost
20599 finished connecting to their destination when they reach
20600 the normal circuit-build timeout. Previously, we would close
20601 introduction circuits which are waiting for an acknowledgement
20602 from the introduction point, and rendezvous circuits which have
20603 been specified in an INTRODUCE1 cell sent to a hidden service,
20604 after the normal CBT. Now, we mark them as 'timed out', and launch
20605 another rendezvous attempt in parallel. This behavior change can
20606 be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
20607 option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
20609 o Minor bugfixes (hidden services, service-side):
20610 - Don't close hidden-service-side rendezvous circuits when they
20611 reach the normal circuit-build timeout. This behavior change can
20612 be disabled using the new
20613 CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
20614 remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
20615 - Don't launch more than 10 service-side introduction-point circuits
20616 for a hidden service in five minutes. Previously, we would consider
20617 launching more introduction-point circuits if at least one second
20618 had passed without any introduction-point circuits failing. Fixes
20619 bug 4607; bugfix on 0.0.7pre1.
20621 o Minor bugfixes (config option behavior):
20622 - If the user tries to set MyFamily on a bridge, refuse to
20623 do so, and warn about the security implications. Fixes bug 4657;
20624 bugfix on 0.2.0.3-alpha.
20625 - The "--quiet" and "--hush" options now apply not only to Tor's
20626 behavior before logs are configured, but also to Tor's behavior in
20627 the absence of configured logs. Fixes bug 3550; bugfix on
20629 - Change the AllowDotExit rules so they should actually work.
20630 We now enforce AllowDotExit only immediately after receiving an
20631 address via SOCKS or DNSPort: other sources are free to provide
20632 .exit addresses after the resolution occurs. Fixes bug 3940;
20633 bugfix on 0.2.2.1-alpha.
20634 - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
20635 don't depend on the consensus parameters or compute adaptive
20636 timeouts when it is disabled. Fixes bug 5049; bugfix on
20638 - After we pick a directory mirror, we would refuse to use it if
20639 it's in our ExcludeExitNodes list, resulting in mysterious failures
20640 to bootstrap for people who just wanted to avoid exiting from
20641 certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
20642 - When told to add a bridge with the same digest as a preexisting
20643 bridge but a different addr:port, change the addr:port as
20644 requested. Previously we would not notice the change. Fixes half
20645 of bug 5603; fix on 0.2.2.26-beta.
20647 o Minor bugfixes (controller):
20648 - Allow manual 'authenticate' commands to the controller interface
20649 from netcat (nc) as well as telnet. We were rejecting them because
20650 they didn't come with the expected whitespace at the end of the
20651 command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
20652 - Report a real bootstrap problem to the controller on router
20653 identity mismatch. Previously we just said "foo", which probably
20654 made a lot of sense at the time. Fixes bug 4169; bugfix on
20656 - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
20657 option is set to 0 (which Vidalia version 0.2.16 now does when
20658 a SAVECONF attempt fails), perform other actions that SIGHUP
20659 usually causes (like reopening the logs). Fixes bug 5095; bugfix
20661 - Correctly handle checking the permissions on the parent
20662 directory of a control socket in the root directory. Bug found
20663 by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
20665 - End AUTHCHALLENGE error messages (in the control protocol) with
20666 a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
20668 o Minor bugfixes (network reading/writing):
20669 - Disable writing on marked-for-close connections when they are
20670 blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
20671 bug 5263; bugfix on 0.0.2pre13, where we first added a special
20672 case for flushing marked connections.
20673 - Make sure that there are no unhandled pending TLS errors before
20674 reading from a TLS stream. We had checks in 0.1.0.3-rc, but
20675 lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
20676 Bugfix on 0.1.0.5-rc; fixes bug 4528.
20677 - Detect SSL handshake even when the initial attempt to write the
20678 server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
20679 - If the client fails to set a reasonable set of ciphersuites
20680 during its v2 handshake renegotiation, allow the renegotiation to
20681 continue nevertheless (i.e. send all the required certificates).
20682 Fixes bug 4591; bugfix on 0.2.0.20-rc.
20684 o Minor bugfixes (other):
20685 - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
20686 resource exhaustion, so that clients can adjust their load to
20687 try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
20688 started using END_STREAM_REASON_RESOURCELIMIT.
20689 - Don't check for whether the address we're using for outbound
20690 connections has changed until after the outbound connection has
20691 completed. On Windows, getsockname() doesn't succeed until the
20692 connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
20693 - Don't hold a Windows file handle open for every file mapping;
20694 the file mapping handle is sufficient. Fixes bug 5951; bugfix on
20696 - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
20697 bugfix on 0.2.1.10-alpha.
20698 - If we fail to write a microdescriptor to the disk cache, do not
20699 continue replacing the old microdescriptor file. Fixes bug 2954;
20700 bugfix on 0.2.2.6-alpha.
20702 o Minor bugfixes (log messages, path selection):
20703 - Downgrade "set buildtimeout to low value" messages to "info"
20704 severity; they were never an actual problem, there was never
20705 anything reasonable to do about them, and they tended to spam logs
20706 from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
20707 - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
20708 more information to it, so that we can track it down in case it
20709 returns again. Mitigates bug 5235.
20710 - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
20711 options_validate(); warn if LearnCircuitBuildTimeout is disabled and
20712 CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
20713 - Issue a log message if a guard completes less than 40% of your
20714 circuits. Threshold is configurable by torrc option
20715 PathBiasNoticeRate and consensus parameter pb_noticepct. There is
20716 additional, off-by-default code to disable guards which fail too
20717 many circuits. Addresses ticket 5458.
20719 o Minor bugfixes (log messages, client):
20720 - Downgrade "Got a certificate, but we already have it" log messages
20721 from warning to info, except when we're a dirauth. Fixes bug 5238;
20722 bugfix on 0.2.1.7-alpha.
20723 - Fix the log message describing how we work around discovering
20724 that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
20725 4837; bugfix on 0.2.2.9-alpha.
20726 - When logging about a disallowed .exit name, do not also call it
20727 an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
20728 - Fix a log message suggesting that people contact a non-existent
20729 email address. Fixes bug 3448.
20730 - Rephrase the log message emitted if the TestSocks check is
20731 successful. Patch from Fabian Keil; fixes bug 4094.
20732 - Log (at debug level) whenever a circuit's purpose is changed.
20733 - Log SSL state transitions at log level DEBUG, log domain
20734 HANDSHAKE. This can be useful for debugging censorship events.
20735 Implements ticket 3264.
20736 - We now log which torrc file we're using on startup. Implements
20738 - Rate-limit log messages when asked to connect anonymously to
20739 a private address. When these hit, they tended to hit fast and
20740 often. Also, don't bother trying to connect to addresses that we
20741 are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
20742 reply makes us think we have been lied to, even when the address the
20743 client tried to connect to was "localhost." Resolves ticket 2822.
20745 o Minor bugfixes (log messages, non-client):
20746 - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
20747 Fixes bug 5932; bugfix on 0.2.2.7-alpha.
20748 - Don't log that we have "decided to publish new relay descriptor"
20749 unless we are actually publishing a descriptor. Fixes bug 3942;
20750 bugfix on 0.2.2.28-beta.
20751 - Log which authority we're missing votes from when we go to fetch
20752 them from the other auths.
20753 - Replace "Sending publish request" log messages with "Launching
20754 upload", so that they no longer confusingly imply that we're
20755 sending something to a directory we might not even be connected
20756 to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
20757 - Warn when Tor is configured to use accounting in a way that can
20758 link a hidden service to some other hidden service or public
20759 address. Resolves ticket 6490.
20760 - Fix a minor formatting issue in one of tor-gencert's error messages.
20764 - Update to the latest version of the tinytest unit testing framework.
20765 This includes a couple of bugfixes that can be relevant for
20766 running forked unit tests on Windows, and removes all reserved
20768 - Avoid a false positive in the util/threads unit test by increasing
20769 the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
20770 - Make it possible to set the TestingTorNetwork configuration
20771 option using AlternateDirAuthority and AlternateBridgeAuthority
20772 as an alternative to setting DirServer. Addresses ticket 6377.
20773 - Add a unit test for the environment_variable_names_equal() function.
20774 - A wide variety of new unit tests by Esteban Manchado Velázquez.
20775 - Numerous new unit tests for functions in util.c and address.c by
20777 - The long-disabled benchmark tests are now split into their own
20778 ./src/test/bench binary.
20779 - The benchmark tests can now use more accurate timers than
20780 gettimeofday() when such timers are available.
20781 - Use tt_assert(), not tor_assert(), for checking for test failures.
20782 This makes the unit tests more able to go on in the event that
20785 o Build improvements:
20786 - Use the dead_strip option when building Tor on OS X. This reduces
20787 binary size by almost 19% when linking openssl and libevent
20788 statically, which we do for Tor Browser Bundle.
20789 - Provide a better error message about possible OSX Asciidoc failure
20790 reasons. Fixes bug 6436.
20791 - Detect attempts to build Tor on (as yet hypothetical) versions
20792 of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
20793 fix for bug 4533. Bugfix on 0.2.2.28-beta.
20794 - On Windows, we now define the _WIN32_WINNT macros only if they
20795 are not already defined. This lets the person building Tor decide,
20796 if they want, to require a later version of Windows.
20797 - Our autogen.sh script now uses autoreconf to launch autoconf,
20798 automake, and so on. This is more robust against some of the failure
20799 modes associated with running the autotools pieces on their own.
20800 - Running "make version" now displays the version of Tor that
20801 we're about to build. Idea from katmagic; resolves issue 4400.
20802 - Make 'tor --digests' list hashes of all Tor source files. Bugfix
20803 on 0.2.2.4-alpha; fixes bug 3427.
20804 - New --enable-static-tor configure option for building Tor as
20805 statically as possible. Idea, general hackery and thoughts from
20806 Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
20808 - Limited, experimental support for building with nmake and MSVC.
20810 o Build requirements:
20811 - Building Tor with bufferevent support now requires Libevent
20812 2.0.13-stable or later. Previous versions of Libevent had bugs in
20813 SSL-related bufferevents and related issues that would make Tor
20814 work badly with bufferevents. Requiring 2.0.13-stable also allows
20815 Tor with bufferevents to take advantage of Libevent APIs
20816 introduced after 2.0.8-rc.
20817 - Our build system requires automake 1.6 or later to create the
20818 Makefile.in files. Previously, you could have used 1.4.
20819 This only affects developers and people building Tor from git;
20820 people who build Tor from the source distribution without changing
20821 the Makefile.am files should be fine.
20822 - Detect when we try to build on a platform that doesn't define
20823 AF_UNSPEC to 0. We don't work there, so refuse to compile.
20825 o Build fixes (compile/link):
20826 - Format more doubles with %f, not %lf. Patch from grarpamp to make
20827 Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
20829 - When building with --enable-static-tor on OpenBSD, do not
20830 erroneously attempt to link -lrt. Fixes bug 5103.
20831 - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
20832 that IPv6 stuff will compile on MSVC, and compilation issues
20833 will be easier to track down. Fixes bug 5861.
20834 - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
20835 Fixes bug 6379. Bugfix on 0.2.0.20-rc.
20836 - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
20837 Fixes bug 6097; bugfix on 0.2.2.16-alpha.
20839 o Build fixes (other):
20840 - Use the _WIN32 macro throughout our code to detect Windows.
20841 (Previously we had used the obsolete 'WIN32' and the idiosyncratic
20843 - Properly handle the case where the build-tree is not the same
20844 as the source tree when generating src/common/common_sha1.i,
20845 src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
20846 bugfix on 0.2.0.1-alpha.
20847 - During configure, search for library containing cos function as
20848 libm lives in libcore on some platforms (BeOS/Haiku). Linking
20849 against libm was hard-coded before. Fixes the first part of bug
20850 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
20852 - Prevent a false positive from the check-spaces script, by disabling
20853 the "whitespace between function name and (" check for functions
20856 o Packaging (RPM) changes:
20857 - Update our default RPM spec files to work with mock and rpmbuild
20858 on RHEL/Fedora. They have an updated set of dependencies and
20859 conflicts, a fix for an ancient typo when creating the "_tor"
20860 user, and better instructions. Thanks to Ondrej Mikle for the
20861 patch series. Fixes bug 6043.
20862 - On OpenSUSE, create the /var/run/tor directory on startup if it
20863 is not already created. Patch from Andreas Stieger. Fixes bug 2573.
20865 o Code refactoring (safety):
20866 - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
20867 10 lines. Also, don't nest them. Doing so in the past has
20868 led to hard-to-debug code. The new style is to use the
20869 SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
20870 - Use macros to indicate OpenSSL versions, so we don't need to worry
20871 about accidental hexadecimal bit shifts.
20872 - Use tor_sscanf() in place of scanf() in more places through the
20873 code. This makes us a little more locale-independent, and
20874 should help shut up code-analysis tools that can't tell
20875 a safe sscanf string from a dangerous one.
20876 - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
20877 - Use the smartlist_add_asprintf() alias more consistently.
20879 o Code refactoring (consolidate):
20880 - A major revision to our internal node-selecting and listing logic.
20881 Tor already had at least two major ways to look at the question of
20882 "which Tor servers do we know about": a list of router descriptors,
20883 and a list of entries in the current consensus. With
20884 microdescriptors, we're adding a third. Having so many systems
20885 without an abstraction layer over them was hurting the codebase.
20886 Now, we have a new "node_t" abstraction that presents a consistent
20887 interface to a client's view of a Tor node, and holds (nearly) all
20888 of the mutable state formerly in routerinfo_t and routerstatus_t.
20889 - Move tor_gettimeofday_cached() into compat_libevent.c, and use
20890 Libevent's notion of cached time when possible.
20891 - Remove duplicate code for invoking getrlimit() from control.c.
20892 - Use OpenSSL's built-in SSL_state_string_long() instead of our
20893 own homebrewed ssl_state_to_string() replacement. Patch from
20894 Emile Snyder. Fixes bug 4653.
20895 - Change the symmetric cipher interface so that creating and
20896 initializing a stream cipher are no longer separate functions.
20898 o Code refactoring (separate):
20899 - Make a new "entry connection" struct as an internal subtype of "edge
20900 connection", to simplify the code and make exit connections smaller.
20901 - Split connection_about_to_close() into separate functions for each
20903 - Rewrite the listener-selection logic so that parsing which ports
20904 we want to listen on is now separate from binding to the ports
20907 o Code refactoring (name changes):
20908 - Rename a handful of old identifiers, mostly related to crypto
20909 structures and crypto functions. By convention, our "create an
20910 object" functions are called "type_new()", our "free an object"
20911 functions are called "type_free()", and our types indicate that
20912 they are types only with a final "_t". But a handful of older
20913 types and functions broke these rules, with function names like
20914 "type_create" or "subsystem_op_type", or with type names like
20916 - Rename Tor functions that turn strings into addresses, so that
20917 "parse" indicates that no hostname resolution occurs, and
20918 "lookup" indicates that hostname resolution may occur. This
20919 should help prevent mistakes in the future. Fixes bug 3512.
20920 - Use the name "CERTS" consistently to refer to the new cell type;
20921 we were calling it CERT in some places and CERTS in others.
20922 - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
20923 invalid value, rather than just -1.
20924 - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
20925 can pick them up when the tests aren't disabled. Bugfix on
20926 0.2.2.4-alpha which introduced tinytest.
20928 o Code refactoring (other):
20929 - Defensively refactor rend_mid_rendezvous() so that protocol
20930 violations and length checks happen in the beginning. Fixes
20932 - Remove the pure attribute from all functions that used it
20933 previously. In many cases we assigned it incorrectly, because the
20934 functions might assert or call impure functions, and we don't have
20935 evidence that keeping the pure attribute is worthwhile. Implements
20936 changes suggested in ticket 4421.
20937 - Move the replay-detection cache for the RSA-encrypted parts of
20938 INTRODUCE2 cells to the introduction point data structures.
20939 Previously, we would use one replay-detection cache per hidden
20940 service. Required by fix for bug 3460.
20941 - The helper programs tor-gencert, tor-resolve, and tor-checkkey
20942 no longer link against Libevent: they never used it, but
20943 our library structure used to force them to link it.
20945 o Removed features and files:
20946 - Remove all internal support for unpadded RSA. We never used it, and
20947 it would be a bad idea to start.
20948 - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
20950 - Remove some redundant #include directives throughout the code.
20951 Patch from Andrea Gelmini.
20952 - Remove some old code to remember statistics about which descriptors
20953 we've served as a directory mirror. The feature wasn't used and
20954 is outdated now that microdescriptors are around.
20955 - Remove some old code to work around even older versions of Tor that
20956 used forked processes to handle DNS requests. Such versions of Tor
20957 are no longer in use as relays.
20958 - The "torify" script no longer supports the "tsocks" socksifier
20959 tool, since tsocks doesn't support DNS and UDP right for Tor.
20960 Everyone should be using torsocks instead. Fixes bugs 3530 and
20961 5180. Based on a patch by "ugh".
20962 - Remove the torrc.bridge file: we don't use it for anything, and
20963 it had become badly desynchronized from torrc.sample. Resolves
20967 - Begin a doc/state-contents.txt file to explain the contents of
20968 the Tor state file. Fixes bug 2987.
20969 - Clarify the documentation for the Alternate*Authority options.
20971 - Document the --defaults-torrc option, and the new semantics for
20972 overriding, extending, and clearing lists of options. Closes
20974 - Add missing man page documentation for consensus and microdesc
20975 files. Resolves ticket 6732.
20976 - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
20978 o Documentation fixes:
20979 - Improve the manual's documentation for the NT Service command-line
20980 options. Addresses ticket 3964.
20981 - Clarify SessionGroup documentation slightly; resolves ticket 5437.
20982 - Document the changes to the ORPort and DirPort options, and the
20983 fact that {OR/Dir}ListenAddress is now unnecessary (and
20984 therefore deprecated). Resolves ticket 5597.
20985 - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
20986 - Clarify that hidden services are TCP only. Fixes bug 6024.
20989 Changes in version 0.2.2.39 - 2012-09-11
20990 Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
20994 - Fix an assertion failure in tor_timegm() that could be triggered
20995 by a badly formatted directory object. Bug found by fuzzing with
20996 Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
20997 - Do not crash when comparing an address with port value 0 to an
20998 address policy. This bug could have been used to cause a remote
20999 assertion failure by or against directory authorities, or to
21000 allow some applications to crash clients. Fixes bug 6690; bugfix
21004 Changes in version 0.2.2.38 - 2012-08-12
21005 Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
21006 attack that could in theory leak path information.
21009 - Avoid an uninitialized memory read when reading a vote or consensus
21010 document that has an unrecognized flavor name. This read could
21011 lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
21012 - Try to leak less information about what relays a client is
21013 choosing to a side-channel attacker. Previously, a Tor client would
21014 stop iterating through the list of available relays as soon as it
21015 had chosen one, thus finishing a little earlier when it picked
21016 a router earlier in the list. If an attacker can recover this
21017 timing information (nontrivial but not proven to be impossible),
21018 they could learn some coarse-grained information about which relays
21019 a client was picking (middle nodes in particular are likelier to
21020 be affected than exits). The timing attack might be mitigated by
21021 other factors (see bug 6537 for some discussion), but it's best
21022 not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
21025 Changes in version 0.2.2.37 - 2012-06-06
21026 Tor 0.2.2.37 introduces a workaround for a critical renegotiation
21027 bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
21031 - Work around a bug in OpenSSL that broke renegotiation with TLS
21032 1.1 and TLS 1.2. Without this workaround, all attempts to speak
21033 the v2 Tor connection protocol when both sides were using OpenSSL
21034 1.0.1 would fail. Resolves ticket 6033.
21035 - When waiting for a client to renegotiate, don't allow it to add
21036 any bytes to the input buffer. This fixes a potential DoS issue.
21037 Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
21038 - Fix an edge case where if we fetch or publish a hidden service
21039 descriptor, we might build a 4-hop circuit and then use that circuit
21040 for exiting afterwards -- even if the new last hop doesn't obey our
21041 ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
21044 - Fix a build warning with Clang 3.1 related to our use of vasprintf.
21045 Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
21048 - Tell GCC and Clang to check for any errors in format strings passed
21049 to the tor_v*(print|scan)f functions.
21052 Changes in version 0.2.2.36 - 2012-05-24
21053 Tor 0.2.2.36 updates the addresses for two of the eight directory
21054 authorities, fixes some potential anonymity and security issues,
21055 and fixes several crash bugs.
21057 Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
21058 known flaws, and nobody should be using them. You should upgrade. If
21059 you're using a Linux or BSD and its packages are obsolete, stop using
21060 those packages and upgrade anyway.
21062 o Directory authority changes:
21063 - Change IP address for maatuska (v3 directory authority).
21064 - Change IP address for ides (v3 directory authority), and rename
21068 - When building or running with any version of OpenSSL earlier
21069 than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
21070 versions have a bug (CVE-2011-4576) in which their block cipher
21071 padding includes uninitialized data, potentially leaking sensitive
21072 information to any peer with whom they make a SSLv3 connection. Tor
21073 does not use SSL v3 by default, but a hostile client or server
21074 could force an SSLv3 connection in order to gain information that
21075 they shouldn't have been able to get. The best solution here is to
21076 upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
21077 or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
21078 to make sure that the bug can't happen.
21079 - Never use a bridge or a controller-supplied node as an exit, even
21080 if its exit policy allows it. Found by wanoskarnet. Fixes bug
21081 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
21082 and 0.2.0.3-alpha (for bridge-purpose descriptors).
21083 - Only build circuits if we have a sufficient threshold of the total
21084 descriptors that are marked in the consensus with the "Exit"
21085 flag. This mitigates an attack proposed by wanoskarnet, in which
21086 all of a client's bridges collude to restrict the exit nodes that
21087 the client knows about. Fixes bug 5343.
21088 - Provide controllers with a safer way to implement the cookie
21089 authentication mechanism. With the old method, if another locally
21090 running program could convince a controller that it was the Tor
21091 process, then that program could trick the controller into telling
21092 it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
21093 authentication method uses a challenge-response approach to prevent
21094 this attack. Fixes bug 5185; implements proposal 193.
21097 - Avoid logging uninitialized data when unable to decode a hidden
21098 service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
21099 - Avoid a client-side assertion failure when receiving an INTRODUCE2
21100 cell on a general purpose circuit. Fixes bug 5644; bugfix on
21102 - Fix builds when the path to sed, openssl, or sha1sum contains
21103 spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
21105 - Correct our replacements for the timeradd() and timersub() functions
21106 on platforms that lack them (for example, Windows). The timersub()
21107 function is used when expiring circuits, while timeradd() is
21108 currently unused. Bug report and patch by Vektor. Fixes bug 4778;
21109 bugfix on 0.2.2.24-alpha.
21110 - Fix the SOCKET_OK test that we use to tell when socket
21111 creation fails so that it works on Win64. Fixes part of bug 4533;
21112 bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
21115 - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
21116 Fixes bug 5346; bugfix on 0.0.8pre3.
21117 - Make our number-parsing functions always treat too-large values
21118 as an error, even when those values exceed the width of the
21119 underlying type. Previously, if the caller provided these
21120 functions with minima or maxima set to the extreme values of the
21121 underlying integer type, these functions would return those
21122 values on overflow rather than treating overflow as an error.
21123 Fixes part of bug 5786; bugfix on 0.0.9.
21124 - Older Linux kernels erroneously respond to strange nmap behavior
21125 by having accept() return successfully with a zero-length
21126 socket. When this happens, just close the connection. Previously,
21127 we would try harder to learn the remote address: but there was
21128 no such remote address to learn, and our method for trying to
21129 learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
21130 on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
21131 - Correct parsing of certain date types in parse_http_time().
21132 Without this patch, If-Modified-Since would behave
21133 incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
21134 Esteban Manchado Velázques.
21135 - Change the BridgePassword feature (part of the "bridge community"
21136 design, which is not yet implemented) to use a time-independent
21137 comparison. The old behavior might have allowed an adversary
21138 to use timing to guess the BridgePassword value. Fixes bug 5543;
21139 bugfix on 0.2.0.14-alpha.
21140 - Detect and reject certain misformed escape sequences in
21141 configuration values. Previously, these values would cause us
21142 to crash if received in a torrc file or over an authenticated
21143 control port. Bug found by Esteban Manchado Velázquez, and
21144 independently by Robert Connolly from Matta Consulting who further
21145 noted that it allows a post-authentication heap overflow. Patch
21146 by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
21147 bugfix on 0.2.0.16-alpha.
21148 - Fix a compile warning when using the --enable-openbsd-malloc
21149 configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
21150 - During configure, detect when we're building with clang version
21151 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
21152 CFLAGS. clang doesn't support them yet.
21153 - When sending an HTTP/1.1 proxy request, include a Host header.
21154 Fixes bug 5593; bugfix on 0.2.2.1-alpha.
21155 - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
21156 command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
21157 - If we hit the error case where routerlist_insert() replaces an
21158 existing (old) server descriptor, make sure to remove that
21159 server descriptor from the old_routers list. Fix related to bug
21160 1776. Bugfix on 0.2.2.18-alpha.
21162 o Minor bugfixes (documentation and log messages):
21163 - Fix a typo in a log message in rend_service_rendezvous_has_opened().
21164 Fixes bug 4856; bugfix on Tor 0.0.6.
21165 - Update "ClientOnly" man page entry to explain that there isn't
21166 really any point to messing with it. Resolves ticket 5005.
21167 - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
21168 directory authority option (introduced in Tor 0.2.2.34).
21169 - Downgrade the "We're missing a certificate" message from notice
21170 to info: people kept mistaking it for a real problem, whereas it
21171 is seldom the problem even when we are failing to bootstrap. Fixes
21172 bug 5067; bugfix on 0.2.0.10-alpha.
21173 - Correctly spell "connect" in a log message on failure to create a
21174 controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
21175 - Clarify the behavior of MaxCircuitDirtiness with hidden service
21176 circuits. Fixes issue 5259.
21179 - Directory authorities now reject versions of Tor older than
21180 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
21181 inclusive. These versions accounted for only a small fraction of
21182 the Tor network, and have numerous known security issues. Resolves
21184 - Update to the May 1 2012 Maxmind GeoLite Country database.
21187 - When sending or relaying a RELAY_EARLY cell, we used to convert
21188 it to a RELAY cell if the connection was using the v1 link
21189 protocol. This was a workaround for older versions of Tor, which
21190 didn't handle RELAY_EARLY cells properly. Now that all supported
21191 versions can handle RELAY_EARLY cells, and now that we're enforcing
21192 the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
21193 remove this workaround. Addresses bug 4786.
21196 Changes in version 0.2.2.35 - 2011-12-16
21197 Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
21198 buffers code. Absolutely everybody should upgrade.
21200 The bug relied on an incorrect calculation when making data continuous
21201 in one of our IO buffers, if the first chunk of the buffer was
21202 misaligned by just the wrong amount. The miscalculation would allow an
21203 attacker to overflow a piece of heap-allocated memory. To mount this
21204 attack, the attacker would need to either open a SOCKS connection to
21205 Tor's SocksPort (usually restricted to localhost), or target a Tor
21206 instance configured to make its connections through a SOCKS proxy
21207 (which Tor does not do by default).
21209 Good security practice requires that all heap-overflow bugs should be
21210 presumed to be exploitable until proven otherwise, so we are treating
21211 this as a potential code execution attack. Please upgrade immediately!
21212 This bug does not affect bufferevents-based builds of Tor. Special
21213 thanks to "Vektor" for reporting this issue to us!
21215 Tor 0.2.2.35 also fixes several bugs in previous versions, including
21216 crash bugs for unusual configurations, and a long-term bug that
21217 would prevent Tor from starting on Windows machines with draconian
21220 With this release, we remind everyone that 0.2.0.x has reached its
21221 formal end-of-life. Those Tor versions have many known flaws, and
21222 nobody should be using them. You should upgrade -- ideally to the
21223 0.2.2.x series. If you're using a Linux or BSD and its packages are
21224 obsolete, stop using those packages and upgrade anyway.
21226 The Tor 0.2.1.x series is also approaching its end-of-life: it will no
21227 longer receive support after some time in early 2012.
21230 - Fix a heap overflow bug that could occur when trying to pull
21231 data into the first chunk of a buffer, when that chunk had
21232 already had some data drained from it. Fixes CVE-2011-2778;
21233 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
21234 - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
21235 that it doesn't attempt to allocate a socketpair. This could cause
21236 some problems on Windows systems with overzealous firewalls. Fix for
21237 bug 4457; workaround for Libevent versions 2.0.1-alpha through
21239 - If we mark an OR connection for close based on a cell we process,
21240 don't process any further cells on it. We already avoid further
21241 reads on marked-for-close connections, but now we also discard the
21242 cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
21243 which was the first version where we might mark a connection for
21244 close based on processing a cell on it.
21245 - Correctly sanity-check that we don't underflow on a memory
21246 allocation (and then assert) for hidden service introduction
21247 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
21248 bugfix on 0.2.1.5-alpha.
21249 - Fix a memory leak when we check whether a hidden service
21250 descriptor has any usable introduction points left. Fixes bug
21251 4424. Bugfix on 0.2.2.25-alpha.
21252 - Don't crash when we're running as a relay and don't have a GeoIP
21253 file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
21254 we've had in the 0.2.3.x branch already.
21255 - When running as a client, do not print a misleading (and plain
21256 wrong) log message that we're collecting "directory request"
21257 statistics: clients don't collect statistics. Also don't create a
21258 useless (because empty) stats file in the stats/ directory. Fixes
21259 bug 4353; bugfix on 0.2.2.34.
21262 - Detect failure to initialize Libevent. This fix provides better
21263 detection for future instances of bug 4457.
21264 - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
21265 function. This was eating up hideously large amounts of time on some
21266 busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
21267 - Resolve an integer overflow bug in smartlist_ensure_capacity().
21268 Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
21270 - Don't warn about unused log_mutex in log.c when building with
21271 --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
21272 0.1.0.6-rc which introduced --disable-threads.
21273 - When configuring, starting, or stopping an NT service, stop
21274 immediately after the service configuration attempt has succeeded
21275 or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
21276 - When sending a NETINFO cell, include the original address
21277 received for the other side, not its canonical address. Found
21278 by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
21279 - Fix a typo in a hibernation-related log message. Fixes bug 4331;
21280 bugfix on 0.2.2.23-alpha; found by "tmpname0901".
21281 - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
21282 occurred when a client tried to fetch a descriptor for a bridge
21283 in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
21284 - Backport fixes for a pair of compilation warnings on Windows.
21285 Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
21286 - If we had ever tried to call tor_addr_to_str on an address of
21287 unknown type, we would have done a strdup on an uninitialized
21288 buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
21289 Reported by "troll_un".
21290 - Correctly detect and handle transient lookup failures from
21291 tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
21292 Reported by "troll_un".
21293 - Fix null-pointer access that could occur if TLS allocation failed.
21294 Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
21295 - Use tor_socket_t type for listener argument to accept(). Fixes bug
21296 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
21299 - Add two new config options for directory authorities:
21300 AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
21301 Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
21302 that is always sufficient to satisfy the bandwidth requirement for
21303 the Guard flag. Now it will be easier for researchers to simulate
21304 Tor networks with different values. Resolves ticket 4484.
21305 - When Tor ignores a hidden service specified in its configuration,
21306 include the hidden service's directory in the warning message.
21307 Previously, we would only tell the user that some hidden service
21308 was ignored. Bugfix on 0.0.6; fixes bug 4426.
21309 - Update to the December 6 2011 Maxmind GeoLite Country database.
21311 o Packaging changes:
21312 - Make it easier to automate expert package builds on Windows,
21313 by removing an absolute path from makensis.exe command.
21316 Changes in version 0.2.1.32 - 2011-12-16
21317 Tor 0.2.1.32 backports important security and privacy fixes for
21318 oldstable. This release is intended only for package maintainers and
21319 others who cannot use the 0.2.2 stable series. All others should be
21320 using Tor 0.2.2.x or newer.
21322 The Tor 0.2.1.x series will reach formal end-of-life some time in
21323 early 2012; we will stop releasing patches for it then.
21325 o Major bugfixes (also included in 0.2.2.x):
21326 - Correctly sanity-check that we don't underflow on a memory
21327 allocation (and then assert) for hidden service introduction
21328 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
21329 bugfix on 0.2.1.5-alpha.
21330 - Fix a heap overflow bug that could occur when trying to pull
21331 data into the first chunk of a buffer, when that chunk had
21332 already had some data drained from it. Fixes CVE-2011-2778;
21333 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
21336 - Update to the December 6 2011 Maxmind GeoLite Country database.
21339 Changes in version 0.2.2.34 - 2011-10-26
21340 Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
21341 can deanonymize Tor users. Everybody should upgrade.
21343 The attack relies on four components: 1) Clients reuse their TLS cert
21344 when talking to different relays, so relays can recognize a user by
21345 the identity key in her cert. 2) An attacker who knows the client's
21346 identity key can probe each guard relay to see if that identity key
21347 is connected to that guard relay right now. 3) A variety of active
21348 attacks in the literature (starting from "Low-Cost Traffic Analysis
21349 of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
21350 discover the guard relays that a Tor user visiting the website is using.
21351 4) Clients typically pick three guards at random, so the set of guards
21352 for a given user could well be a unique fingerprint for her. This
21353 release fixes components #1 and #2, which is enough to block the attack;
21354 the other two remain as open research problems. Special thanks to
21355 "frosty_un" for reporting the issue to us!
21357 Clients should upgrade so they are no longer recognizable by the TLS
21358 certs they present. Relays should upgrade so they no longer allow a
21359 remote attacker to probe them to test whether unpatched clients are
21360 currently connected to them.
21362 This release also fixes several vulnerabilities that allow an attacker
21363 to enumerate bridge relays. Some bridge enumeration attacks still
21364 remain; see for example proposal 188.
21366 o Privacy/anonymity fixes (clients):
21367 - Clients and bridges no longer send TLS certificate chains on
21368 outgoing OR connections. Previously, each client or bridge would
21369 use the same cert chain for all outgoing OR connections until
21370 its IP address changes, which allowed any relay that the client
21371 or bridge contacted to determine which entry guards it is using.
21372 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
21373 - If a relay receives a CREATE_FAST cell on a TLS connection, it
21374 no longer considers that connection as suitable for satisfying a
21375 circuit EXTEND request. Now relays can protect clients from the
21376 CVE-2011-2768 issue even if the clients haven't upgraded yet.
21377 - Directory authorities no longer assign the Guard flag to relays
21378 that haven't upgraded to the above "refuse EXTEND requests
21379 to client connections" fix. Now directory authorities can
21380 protect clients from the CVE-2011-2768 issue even if neither
21381 the clients nor the relays have upgraded yet. There's a new
21382 "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
21383 to let us transition smoothly, else tomorrow there would be no
21386 o Privacy/anonymity fixes (bridge enumeration):
21387 - Bridge relays now do their directory fetches inside Tor TLS
21388 connections, like all the other clients do, rather than connecting
21389 directly to the DirPort like public relays do. Removes another
21390 avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
21391 - Bridges relays now build circuits for themselves in a more similar
21392 way to how clients build them. Removes another avenue for
21393 enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
21394 when bridges were introduced.
21395 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
21396 that they initiated. Relays could distinguish incoming bridge
21397 connections from client connections, creating another avenue for
21398 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
21399 Found by "frosty_un".
21402 - Fix a crash bug when changing node restrictions while a DNS lookup
21403 is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
21405 - Don't launch a useless circuit after failing to use one of a
21406 hidden service's introduction points. Previously, we would
21407 launch a new introduction circuit, but not set the hidden service
21408 which that circuit was intended to connect to, so it would never
21409 actually be used. A different piece of code would then create a
21410 new introduction circuit correctly. Bug reported by katmagic and
21411 found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
21414 - Change an integer overflow check in the OpenBSD_Malloc code so
21415 that GCC is less likely to eliminate it as impossible. Patch
21416 from Mansour Moufid. Fixes bug 4059.
21417 - When a hidden service turns an extra service-side introduction
21418 circuit into a general-purpose circuit, free the rend_data and
21419 intro_key fields first, so we won't leak memory if the circuit
21420 is cannibalized for use as another service-side introduction
21421 circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
21422 - Bridges now skip DNS self-tests, to act a little more stealthily.
21423 Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
21424 bridges. Patch by "warms0x".
21425 - Fix internal bug-checking logic that was supposed to catch
21426 failures in digest generation so that it will fail more robustly
21427 if we ask for a nonexistent algorithm. Found by Coverity Scan.
21428 Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
21429 - Report any failure in init_keys() calls launched because our
21430 IP address has changed. Spotted by Coverity Scan. Bugfix on
21431 0.1.1.4-alpha; fixes CID 484.
21433 o Minor bugfixes (log messages and documentation):
21434 - Remove a confusing dollar sign from the example fingerprint in the
21435 man page, and also make the example fingerprint a valid one. Fixes
21436 bug 4309; bugfix on 0.2.1.3-alpha.
21437 - The next version of Windows will be called Windows 8, and it has
21438 a major version of 6, minor version of 2. Correctly identify that
21439 version instead of calling it "Very recent version". Resolves
21440 ticket 4153; reported by funkstar.
21441 - Downgrade log messages about circuit timeout calibration from
21442 "notice" to "info": they don't require or suggest any human
21443 intervention. Patch from Tom Lowenthal. Fixes bug 4063;
21444 bugfix on 0.2.2.14-alpha.
21447 - Turn on directory request statistics by default and include them in
21448 extra-info descriptors. Don't break if we have no GeoIP database.
21449 Backported from 0.2.3.1-alpha; implements ticket 3951.
21450 - Update to the October 4 2011 Maxmind GeoLite Country database.
21453 Changes in version 0.2.1.31 - 2011-10-26
21454 Tor 0.2.1.31 backports important security and privacy fixes for
21455 oldstable. This release is intended only for package maintainers and
21456 others who cannot use the 0.2.2 stable series. All others should be
21457 using Tor 0.2.2.x or newer.
21459 o Security fixes (also included in 0.2.2.x):
21460 - Replace all potentially sensitive memory comparison operations
21461 with versions whose runtime does not depend on the data being
21462 compared. This will help resist a class of attacks where an
21463 adversary can use variations in timing information to learn
21464 sensitive data. Fix for one case of bug 3122. (Safe memcmp
21465 implementation by Robert Ransom based partially on code by DJB.)
21466 - Fix an assert in parsing router descriptors containing IPv6
21467 addresses. This one took down the directory authorities when
21468 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
21470 o Privacy/anonymity fixes (also included in 0.2.2.x):
21471 - Clients and bridges no longer send TLS certificate chains on
21472 outgoing OR connections. Previously, each client or bridge would
21473 use the same cert chain for all outgoing OR connections until
21474 its IP address changes, which allowed any relay that the client
21475 or bridge contacted to determine which entry guards it is using.
21476 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
21477 - If a relay receives a CREATE_FAST cell on a TLS connection, it
21478 no longer considers that connection as suitable for satisfying a
21479 circuit EXTEND request. Now relays can protect clients from the
21480 CVE-2011-2768 issue even if the clients haven't upgraded yet.
21481 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
21482 that they initiated. Relays could distinguish incoming bridge
21483 connections from client connections, creating another avenue for
21484 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
21485 Found by "frosty_un".
21486 - When receiving a hidden service descriptor, check that it is for
21487 the hidden service we wanted. Previously, Tor would store any
21488 hidden service descriptors that a directory gave it, whether it
21489 wanted them or not. This wouldn't have let an attacker impersonate
21490 a hidden service, but it did let directories pre-seed a client
21491 with descriptors that it didn't want. Bugfix on 0.0.6.
21492 - Avoid linkability based on cached hidden service descriptors: forget
21493 all hidden service descriptors cached as a client when processing a
21494 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
21495 - Make the bridge directory authority refuse to answer directory
21496 requests for "all" descriptors. It used to include bridge
21497 descriptors in its answer, which was a major information leak.
21498 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
21499 - Don't attach new streams to old rendezvous circuits after SIGNAL
21500 NEWNYM. Previously, we would keep using an existing rendezvous
21501 circuit if it remained open (i.e. if it were kept open by a
21502 long-lived stream, or if a new stream were attached to it before
21503 Tor could notice that it was old and no longer in use). Bugfix on
21504 0.1.1.15-rc; fixes bug 3375.
21506 o Minor bugfixes (also included in 0.2.2.x):
21507 - When we restart our relay, we might get a successful connection
21508 from the outside before we've started our reachability tests,
21509 triggering a warning: "ORPort found reachable, but I have no
21510 routerinfo yet. Failing to inform controller of success." This
21511 bug was harmless unless Tor is running under a controller
21512 like Vidalia, in which case the controller would never get a
21513 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
21515 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
21516 enabled. Fixes bug 1526.
21517 - Remove undocumented option "-F" from tor-resolve: it hasn't done
21518 anything since 0.2.1.16-rc.
21519 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
21520 None of the cases where we did this before were wrong, but by making
21521 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
21522 - Fix a rare crash bug that could occur when a client was configured
21523 with a large number of bridges. Fixes bug 2629; bugfix on
21524 0.2.1.2-alpha. Bugfix by trac user "shitlei".
21525 - Correct the warning displayed when a rendezvous descriptor exceeds
21526 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
21528 - Fix an uncommon assertion failure when running with DNSPort under
21529 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
21530 - When warning about missing zlib development packages during compile,
21531 give the correct package names. Bugfix on 0.2.0.1-alpha.
21532 - Require that introduction point keys and onion keys have public
21533 exponent 65537. Bugfix on 0.2.0.10-alpha.
21534 - Do not crash when our configuration file becomes unreadable, for
21535 example due to a permissions change, between when we start up
21536 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
21538 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
21540 - Always NUL-terminate the sun_path field of a sockaddr_un before
21541 passing it to the kernel. (Not a security issue: kernels are
21542 smart enough to reject bad sockaddr_uns.) Found by Coverity;
21543 CID #428. Bugfix on Tor 0.2.0.3-alpha.
21544 - Don't stack-allocate the list of supplementary GIDs when we're
21545 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
21546 could take up to 256K, which is way too much stack. Found by
21547 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
21549 o Minor bugfixes (only in 0.2.1.x):
21550 - Resume using micro-version numbers in 0.2.1.x: our Debian packages
21551 rely on them. Bugfix on 0.2.1.30.
21552 - Use git revisions instead of svn revisions when generating our
21553 micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
21555 o Minor features (also included in 0.2.2.x):
21556 - Adjust the expiration time on our SSL session certificates to
21557 better match SSL certs seen in the wild. Resolves ticket 4014.
21558 - Allow nameservers with IPv6 address. Resolves bug 2574.
21559 - Update to the October 4 2011 Maxmind GeoLite Country database.
21562 Changes in version 0.2.2.33 - 2011-09-13
21563 Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
21564 TLS handshake that makes relays and bridges that run this new version
21565 reachable from Iran again.
21568 - Avoid an assertion failure when reloading a configuration with
21569 TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
21570 3923; bugfix on 0.2.2.25-alpha.
21572 o Minor features (security):
21573 - Check for replays of the public-key encrypted portion of an
21574 INTRODUCE1 cell, in addition to the current check for replays of
21575 the g^x value. This prevents a possible class of active attacks
21576 by an attacker who controls both an introduction point and a
21577 rendezvous point, and who uses the malleability of AES-CTR to
21578 alter the encrypted g^x portion of the INTRODUCE1 cell. We think
21579 that these attacks are infeasible (requiring the attacker to send
21580 on the order of zettabytes of altered cells in a short interval),
21581 but we'd rather block them off in case there are any classes of
21582 this attack that we missed. Reported by Willem Pinckaers.
21585 - Adjust the expiration time on our SSL session certificates to
21586 better match SSL certs seen in the wild. Resolves ticket 4014.
21587 - Change the default required uptime for a relay to be accepted as
21588 a HSDir (hidden service directory) from 24 hours to 25 hours.
21589 Improves on 0.2.0.10-alpha; resolves ticket 2649.
21590 - Add a VoteOnHidServDirectoriesV2 config option to allow directory
21591 authorities to abstain from voting on assignment of the HSDir
21592 consensus flag. Related to bug 2649.
21593 - Update to the September 6 2011 Maxmind GeoLite Country database.
21595 o Minor bugfixes (documentation and log messages):
21596 - Correct the man page to explain that HashedControlPassword and
21597 CookieAuthentication can both be set, in which case either method
21598 is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
21599 when we decided to allow these config options to both be set. Issue
21600 raised by bug 3898.
21601 - Demote the 'replay detected' log message emitted when a hidden
21602 service receives the same Diffie-Hellman public key in two different
21603 INTRODUCE2 cells to info level. A normal Tor client can cause that
21604 log message during its normal operation. Bugfix on 0.2.1.6-alpha;
21605 fixes part of bug 2442.
21606 - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
21607 level. There is nothing that a hidden service's operator can do
21608 to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
21610 - Clarify a log message specifying the characters permitted in
21611 HiddenServiceAuthorizeClient client names. Previously, the log
21612 message said that "[A-Za-z0-9+-_]" were permitted; that could have
21613 given the impression that every ASCII character between "+" and "_"
21614 was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
21617 - Provide a substitute implementation of lround() for MSVC, which
21618 apparently lacks it. Patch from Gisle Vanem.
21619 - Clean up some code issues that prevented Tor from building on older
21620 BSDs. Fixes bug 3894; reported by "grarpamp".
21621 - Search for a platform-specific version of "ar" when cross-compiling.
21622 Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
21625 Changes in version 0.2.2.32 - 2011-08-27
21626 The Tor 0.2.2 release series is dedicated to the memory of Andreas
21627 Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
21628 a founder of the PETS community, a leader in our field, a mentor,
21629 and a friend. He left us with these words: "I had the possibility
21630 to contribute to this world that is not as it should be. I hope I
21631 could help in some areas to make the world a better place, and that
21632 I could also encourage other people to be engaged in improving the
21633 world. Please, stay engaged. This world needs you, your love, your
21634 initiative -- now I cannot be part of that anymore."
21636 Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
21637 ready. More than two years in the making, this release features improved
21638 client performance and hidden service reliability, better compatibility
21639 for Android, correct behavior for bridges that listen on more than
21640 one address, more extensible and flexible directory object handling,
21641 better reporting of network statistics, improved code security, and
21642 many many other features and bugfixes.
21644 o Major features (client performance):
21645 - When choosing which cells to relay first, relays now favor circuits
21646 that have been quiet recently, to provide lower latency for
21647 low-volume circuits. By default, relays enable or disable this
21648 feature based on a setting in the consensus. They can override
21649 this default by using the new "CircuitPriorityHalflife" config
21650 option. Design and code by Ian Goldberg, Can Tang, and Chris
21652 - Directory authorities now compute consensus weightings that instruct
21653 clients how to weight relays flagged as Guard, Exit, Guard+Exit,
21654 and no flag. Clients use these weightings to distribute network load
21655 more evenly across these different relay types. The weightings are
21656 in the consensus so we can change them globally in the future. Extra
21657 thanks to "outofwords" for finding some nasty security bugs in
21658 the first implementation of this feature.
21660 o Major features (client performance, circuit build timeout):
21661 - Tor now tracks how long it takes to build client-side circuits
21662 over time, and adapts its timeout to local network performance.
21663 Since a circuit that takes a long time to build will also provide
21664 bad performance, we get significant latency improvements by
21665 discarding the slowest 20% of circuits. Specifically, Tor creates
21666 circuits more aggressively than usual until it has enough data
21667 points for a good timeout estimate. Implements proposal 151.
21668 - Circuit build timeout constants can be controlled by consensus
21669 parameters. We set good defaults for these parameters based on
21670 experimentation on broadband and simulated high-latency links.
21671 - Circuit build time learning can be disabled via consensus parameter
21672 or by the client via a LearnCircuitBuildTimeout config option. We
21673 also automatically disable circuit build time calculation if either
21674 AuthoritativeDirectory is set, or if we fail to write our state
21675 file. Implements ticket 1296.
21677 o Major features (relays use their capacity better):
21678 - Set SO_REUSEADDR socket option on all sockets, not just
21679 listeners. This should help busy exit nodes avoid running out of
21680 useable ports just because all the ports have been used in the
21681 near past. Resolves issue 2850.
21682 - Relays now save observed peak bandwidth throughput rates to their
21683 state file (along with total usage, which was already saved),
21684 so that they can determine their correct estimated bandwidth on
21685 restart. Resolves bug 1863, where Tor relays would reset their
21686 estimated bandwidth to 0 after restarting.
21687 - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
21688 should give us approximately 40-50% more Guard-flagged nodes,
21689 improving the anonymity the Tor network can provide and also
21690 decreasing the dropoff in throughput that relays experience when
21691 they first get the Guard flag.
21692 - Directory authorities now take changes in router IP address and
21693 ORPort into account when determining router stability. Previously,
21694 if a router changed its IP or ORPort, the authorities would not
21695 treat it as having any downtime for the purposes of stability
21696 calculation, whereas clients would experience downtime since the
21697 change would take a while to propagate to them. Resolves issue 1035.
21698 - New AccelName and AccelDir options add support for dynamic OpenSSL
21699 hardware crypto acceleration engines.
21701 o Major features (relays control their load better):
21702 - Exit relays now try harder to block exit attempts from unknown
21703 relays, to make it harder for people to use them as one-hop proxies
21704 a la tortunnel. Controlled by the refuseunknownexits consensus
21705 parameter (currently enabled), or you can override it on your
21706 relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
21707 based on a variant of proposal 163.
21708 - Add separate per-conn write limiting to go with the per-conn read
21709 limiting. We added a global write limit in Tor 0.1.2.5-alpha,
21710 but never per-conn write limits.
21711 - New consensus params "bwconnrate" and "bwconnburst" to let us
21712 rate-limit client connections as they enter the network. It's
21713 controlled in the consensus so we can turn it on and off for
21714 experiments. It's starting out off. Based on proposal 163.
21716 o Major features (controllers):
21717 - Export GeoIP information on bridge usage to controllers even if we
21718 have not yet been running for 24 hours. Now Vidalia bridge operators
21719 can get more accurate and immediate feedback about their
21720 contributions to the network.
21721 - Add an __OwningControllerProcess configuration option and a
21722 TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
21723 that when it exits, Tor will shut down. Implements feature 3049.
21725 o Major features (directory authorities):
21726 - Directory authorities now create, vote on, and serve multiple
21727 parallel formats of directory data as part of their voting process.
21728 Partially implements Proposal 162: "Publish the consensus in
21730 - Directory authorities now agree on and publish small summaries
21731 of router information that clients can use in place of regular
21732 server descriptors. This transition will allow Tor 0.2.3 clients
21733 to use far less bandwidth for downloading information about the
21734 network. Begins the implementation of Proposal 158: "Clients
21735 download consensus + microdescriptors".
21736 - The directory voting system is now extensible to use multiple hash
21737 algorithms for signatures and resource selection. Newer formats
21738 are signed with SHA256, with a possibility for moving to a better
21739 hash algorithm in the future.
21740 - Directory authorities can now vote on arbitrary integer values as
21741 part of the consensus process. This is designed to help set
21742 network-wide parameters. Implements proposal 167.
21744 o Major features and bugfixes (node selection):
21745 - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
21746 ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
21747 options. Previously, we had been ambiguous in describing what
21748 counted as an "exit" node, and what operations exactly "StrictNodes
21749 0" would permit. This created confusion when people saw nodes built
21750 through unexpected circuits, and made it hard to tell real bugs from
21751 surprises. Now the intended behavior is:
21752 . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
21753 a node that delivers user traffic outside the Tor network.
21754 . "Entry", in the context of EntryNodes, means a node used as the
21755 first hop of a multihop circuit. It doesn't include direct
21756 connections to directory servers.
21757 . "ExcludeNodes" applies to all nodes.
21758 . "StrictNodes" changes the behavior of ExcludeNodes only. When
21759 StrictNodes is set, Tor should avoid all nodes listed in
21760 ExcludeNodes, even when it will make user requests fail. When
21761 StrictNodes is *not* set, then Tor should follow ExcludeNodes
21762 whenever it can, except when it must use an excluded node to
21763 perform self-tests, connect to a hidden service, provide a
21764 hidden service, fulfill a .exit request, upload directory
21765 information, or fetch directory information.
21766 Collectively, the changes to implement the behavior fix bug 1090.
21767 - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
21768 change during a config reload, mark and discard all our origin
21769 circuits. This fix should address edge cases where we change the
21770 config options and but then choose a circuit that we created before
21772 - Make EntryNodes config option much more aggressive even when
21773 StrictNodes is not set. Before it would prepend your requested
21774 entrynodes to your list of guard nodes, but feel free to use others
21775 after that. Now it chooses only from your EntryNodes if any of
21776 those are available, and only falls back to others if a) they're
21777 all down and b) StrictNodes is not set.
21778 - Now we refresh your entry guards from EntryNodes at each consensus
21779 fetch -- rather than just at startup and then they slowly rot as
21780 the network changes.
21781 - Add support for the country code "{??}" in torrc options like
21782 ExcludeNodes, to indicate all routers of unknown country. Closes
21784 - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
21785 a node is listed in both, it's treated as excluded.
21786 - ExcludeNodes now applies to directory nodes -- as a preference if
21787 StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
21788 Don't exclude all the directory authorities and set StrictNodes to 1
21789 unless you really want your Tor to break.
21790 - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
21791 - ExcludeExitNodes now overrides .exit requests.
21792 - We don't use bridges listed in ExcludeNodes.
21793 - When StrictNodes is 1:
21794 . We now apply ExcludeNodes to hidden service introduction points
21795 and to rendezvous points selected by hidden service users. This
21796 can make your hidden service less reliable: use it with caution!
21797 . If we have used ExcludeNodes on ourself, do not try relay
21798 reachability self-tests.
21799 . If we have excluded all the directory authorities, we will not
21800 even try to upload our descriptor if we're a relay.
21801 . Do not honor .exit requests to an excluded node.
21802 - When the set of permitted nodes changes, we now remove any mappings
21803 introduced via TrackExitHosts to now-excluded nodes. Bugfix on
21805 - We never cannibalize a circuit that had excluded nodes on it, even
21806 if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
21807 - Improve log messages related to excluded nodes.
21809 o Major features (misc):
21810 - Numerous changes, bugfixes, and workarounds from Nathan Freitas
21811 to help Tor build correctly for Android phones.
21812 - The options SocksPort, ControlPort, and so on now all accept a
21813 value "auto" that opens a socket on an OS-selected port. A
21814 new ControlPortWriteToFile option tells Tor to write its
21815 actual control port or ports to a chosen file. If the option
21816 ControlPortFileGroupReadable is set, the file is created as
21817 group-readable. Now users can run two Tor clients on the same
21818 system without needing to manually mess with parameters. Resolves
21819 part of ticket 3076.
21820 - Tor now supports tunneling all of its outgoing connections over
21821 a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
21822 configuration options. Code by Christopher Davis.
21824 o Code security improvements:
21825 - Replace all potentially sensitive memory comparison operations
21826 with versions whose runtime does not depend on the data being
21827 compared. This will help resist a class of attacks where an
21828 adversary can use variations in timing information to learn
21829 sensitive data. Fix for one case of bug 3122. (Safe memcmp
21830 implementation by Robert Ransom based partially on code by DJB.)
21831 - Enable Address Space Layout Randomization (ASLR) and Data Execution
21832 Prevention (DEP) by default on Windows to make it harder for
21833 attackers to exploit vulnerabilities. Patch from John Brooks.
21834 - New "--enable-gcc-hardening" ./configure flag (off by default)
21835 to turn on gcc compile time hardening options. It ensures
21836 that signed ints have defined behavior (-fwrapv), enables
21837 -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
21838 with canaries (-fstack-protector-all), turns on ASLR protection if
21839 supported by the kernel (-fPIE, -pie), and adds additional security
21840 related warnings. Verified to work on Mac OS X and Debian Lenny.
21841 - New "--enable-linker-hardening" ./configure flag (off by default)
21842 to turn on ELF specific hardening features (relro, now). This does
21843 not work with Mac OS X or any other non-ELF binary format.
21844 - Always search the Windows system directory for system DLLs, and
21845 nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
21846 - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
21847 current and future memory pages via mlockall(). On supported
21848 platforms (modern Linux and probably BSD but not Windows or OS X),
21849 this should effectively disable any and all attempts to page out
21850 memory. This option requires that you start your Tor as root --
21851 if you use DisableAllSwap, please consider using the User option
21852 to properly reduce the privileges of your Tor.
21854 o Major bugfixes (crashes):
21855 - Fix crash bug on platforms where gmtime and localtime can return
21856 NULL. Windows 7 users were running into this one. Fixes part of bug
21857 2077. Bugfix on all versions of Tor. Found by boboper.
21858 - Introduce minimum/maximum values that clients will believe
21859 from the consensus. Now we'll have a better chance to avoid crashes
21860 or worse when a consensus param has a weird value.
21861 - Fix a rare crash bug that could occur when a client was configured
21862 with a large number of bridges. Fixes bug 2629; bugfix on
21863 0.2.1.2-alpha. Bugfix by trac user "shitlei".
21864 - Do not crash when our configuration file becomes unreadable, for
21865 example due to a permissions change, between when we start up
21866 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
21868 - If we're in the pathological case where there's no exit bandwidth
21869 but there is non-exit bandwidth, or no guard bandwidth but there
21870 is non-guard bandwidth, don't crash during path selection. Bugfix
21872 - Fix a crash bug when trying to initialize the evdns module in
21873 Libevent 2. Bugfix on 0.2.1.16-rc.
21875 o Major bugfixes (stability):
21876 - Fix an assert in parsing router descriptors containing IPv6
21877 addresses. This one took down the directory authorities when
21878 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
21879 - Fix an uncommon assertion failure when running with DNSPort under
21880 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
21881 - Treat an unset $HOME like an empty $HOME rather than triggering an
21882 assert. Bugfix on 0.0.8pre1; fixes bug 1522.
21883 - More gracefully handle corrupt state files, removing asserts
21884 in favor of saving a backup and resetting state.
21885 - Instead of giving an assertion failure on an internal mismatch
21886 on estimated freelist size, just log a BUG warning and try later.
21887 Mitigates but does not fix bug 1125.
21888 - Fix an assert that got triggered when using the TestingTorNetwork
21889 configuration option and then issuing a GETINFO config-text control
21890 command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
21891 - If the cached cert file is unparseable, warn but don't exit.
21893 o Privacy fixes (relays/bridges):
21894 - Don't list Windows capabilities in relay descriptors. We never made
21895 use of them, and maybe it's a bad idea to publish them. Bugfix
21897 - If the Nickname configuration option isn't given, Tor would pick a
21898 nickname based on the local hostname as the nickname for a relay.
21899 Because nicknames are not very important in today's Tor and the
21900 "Unnamed" nickname has been implemented, this is now problematic
21901 behavior: It leaks information about the hostname without being
21902 useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
21903 introduced the Unnamed nickname. Reported by tagnaq.
21904 - Maintain separate TLS contexts and certificates for incoming and
21905 outgoing connections in bridge relays. Previously we would use the
21906 same TLS contexts and certs for incoming and outgoing connections.
21907 Bugfix on 0.2.0.3-alpha; addresses bug 988.
21908 - Maintain separate identity keys for incoming and outgoing TLS
21909 contexts in bridge relays. Previously we would use the same
21910 identity keys for incoming and outgoing TLS contexts. Bugfix on
21911 0.2.0.3-alpha; addresses the other half of bug 988.
21912 - Make the bridge directory authority refuse to answer directory
21913 requests for "all descriptors". It used to include bridge
21914 descriptors in its answer, which was a major information leak.
21915 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
21917 o Privacy fixes (clients):
21918 - When receiving a hidden service descriptor, check that it is for
21919 the hidden service we wanted. Previously, Tor would store any
21920 hidden service descriptors that a directory gave it, whether it
21921 wanted them or not. This wouldn't have let an attacker impersonate
21922 a hidden service, but it did let directories pre-seed a client
21923 with descriptors that it didn't want. Bugfix on 0.0.6.
21924 - Start the process of disabling ".exit" address notation, since it
21925 can be used for a variety of esoteric application-level attacks
21926 on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
21928 - Reject attempts at the client side to open connections to private
21929 IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
21930 a randomly chosen exit node. Attempts to do so are always
21931 ill-defined, generally prevented by exit policies, and usually
21932 in error. This will also help to detect loops in transparent
21933 proxy configurations. You can disable this feature by setting
21934 "ClientRejectInternalAddresses 0" in your torrc.
21935 - Log a notice when we get a new control connection. Now it's easier
21936 for security-conscious users to recognize when a local application
21937 is knocking on their controller door. Suggested by bug 1196.
21939 o Privacy fixes (newnym):
21940 - Avoid linkability based on cached hidden service descriptors: forget
21941 all hidden service descriptors cached as a client when processing a
21942 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
21943 - On SIGHUP, do not clear out all TrackHostExits mappings, client
21944 DNS cache entries, and virtual address mappings: that's what
21945 NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
21946 - Don't attach new streams to old rendezvous circuits after SIGNAL
21947 NEWNYM. Previously, we would keep using an existing rendezvous
21948 circuit if it remained open (i.e. if it were kept open by a
21949 long-lived stream, or if a new stream were attached to it before
21950 Tor could notice that it was old and no longer in use). Bugfix on
21951 0.1.1.15-rc; fixes bug 3375.
21953 o Major bugfixes (relay bandwidth accounting):
21954 - Fix a bug that could break accounting on 64-bit systems with large
21955 time_t values, making them hibernate for impossibly long intervals.
21956 Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
21957 - Fix a bug in bandwidth accounting that could make us use twice
21958 the intended bandwidth when our interval start changes due to
21959 daylight saving time. Now we tolerate skew in stored vs computed
21960 interval starts: if the start of the period changes by no more than
21961 50% of the period's duration, we remember bytes that we transferred
21962 in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
21964 o Major bugfixes (bridges):
21965 - Bridges now use "reject *:*" as their default exit policy. Bugfix
21966 on 0.2.0.3-alpha. Fixes bug 1113.
21967 - If you configure your bridge with a known identity fingerprint,
21968 and the bridge authority is unreachable (as it is in at least
21969 one country now), fall back to directly requesting the descriptor
21970 from the bridge. Finishes the feature started in 0.2.0.10-alpha;
21972 - Fix a bug where bridge users who configure the non-canonical
21973 address of a bridge automatically switch to its canonical
21974 address. If a bridge listens at more than one address, it
21975 should be able to advertise those addresses independently and
21976 any non-blocked addresses should continue to work. Bugfix on Tor
21977 0.2.0.3-alpha. Fixes bug 2510.
21978 - If you configure Tor to use bridge A, and then quit and
21979 configure Tor to use bridge B instead (or if you change Tor
21980 to use bridge B via the controller), it would happily continue
21981 to use bridge A if it's still reachable. While this behavior is
21982 a feature if your goal is connectivity, in some scenarios it's a
21983 dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
21984 - When the controller configures a new bridge, don't wait 10 to 60
21985 seconds before trying to fetch its descriptor. Bugfix on
21986 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
21988 o Major bugfixes (directory authorities):
21989 - Many relays have been falling out of the consensus lately because
21990 not enough authorities know about their descriptor for them to get
21991 a majority of votes. When we deprecated the v2 directory protocol,
21992 we got rid of the only way that v3 authorities can hear from each
21993 other about other descriptors. Now authorities examine every v3
21994 vote for new descriptors, and fetch them from that authority. Bugfix
21996 - Authorities could be tricked into giving out the Exit flag to relays
21997 that didn't allow exiting to any ports. This bug could screw
21998 with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
21999 1238. Bug discovered by Martin Kowalczyk.
22000 - If all authorities restart at once right before a consensus vote,
22001 nobody will vote about "Running", and clients will get a consensus
22002 with no usable relays. Instead, authorities refuse to build a
22003 consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
22005 o Major bugfixes (stream-level fairness):
22006 - When receiving a circuit-level SENDME for a blocked circuit, try
22007 to package cells fairly from all the streams that had previously
22008 been blocked on that circuit. Previously, we had started with the
22009 oldest stream, and allowed each stream to potentially exhaust
22010 the circuit's package window. This gave older streams on any
22011 given circuit priority over newer ones. Fixes bug 1937. Detected
22012 originally by Camilo Viecco. This bug was introduced before the
22013 first Tor release, in svn commit r152: it is the new winner of
22014 the longest-lived bug prize.
22015 - Fix a stream fairness bug that would cause newer streams on a given
22016 circuit to get preference when reading bytes from the origin or
22017 destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
22018 introduced before the first Tor release, in svn revision r152.
22019 - When the exit relay got a circuit-level sendme cell, it started
22020 reading on the exit streams, even if had 500 cells queued in the
22021 circuit queue already, so the circuit queue just grew and grew in
22022 some cases. We fix this by not re-enabling reading on receipt of a
22023 sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
22024 on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
22026 - Newly created streams were allowed to read cells onto circuits,
22027 even if the circuit's cell queue was blocked and waiting to drain.
22028 This created potential unfairness, as older streams would be
22029 blocked, but newer streams would gladly fill the queue completely.
22030 We add code to detect this situation and prevent any stream from
22031 getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
22034 o Major bugfixes (hidden services):
22035 - Apply circuit timeouts to opened hidden-service-related circuits
22036 based on the correct start time. Previously, we would apply the
22037 circuit build timeout based on time since the circuit's creation;
22038 it was supposed to be applied based on time since the circuit
22039 entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
22040 - Improve hidden service robustness: When we find that we have
22041 extended a hidden service's introduction circuit to a relay not
22042 listed as an introduction point in the HS descriptor we currently
22043 have, retry with an introduction point from the current
22044 descriptor. Previously we would just give up. Fixes bugs 1024 and
22045 1930; bugfix on 0.2.0.10-alpha.
22046 - Directory authorities now use data collected from their own
22047 uptime observations when choosing whether to assign the HSDir flag
22048 to relays, instead of trusting the uptime value the relay reports in
22049 its descriptor. This change helps prevent an attack where a small
22050 set of nodes with frequently-changing identity keys can blackhole
22051 a hidden service. (Only authorities need upgrade; others will be
22052 fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
22053 - Stop assigning the HSDir flag to relays that disable their
22054 DirPort (and thus will refuse to answer directory requests). This
22055 fix should dramatically improve the reachability of hidden services:
22056 hidden services and hidden service clients pick six HSDir relays
22057 to store and retrieve the hidden service descriptor, and currently
22058 about half of the HSDir relays will refuse to work. Bugfix on
22059 0.2.0.10-alpha; fixes part of bug 1693.
22061 o Major bugfixes (misc):
22062 - Clients now stop trying to use an exit node associated with a given
22063 destination by TrackHostExits if they fail to reach that exit node.
22064 Fixes bug 2999. Bugfix on 0.2.0.20-rc.
22065 - Fix a regression that caused Tor to rebind its ports if it receives
22066 SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
22067 - Remove an extra pair of quotation marks around the error
22068 message in control-port STATUS_GENERAL BUG events. Bugfix on
22069 0.1.2.6-alpha; fixes bug 3732.
22071 o Minor features (relays):
22072 - Ensure that no empty [dirreq-](read|write)-history lines are added
22073 to an extrainfo document. Implements ticket 2497.
22074 - When bandwidth accounting is enabled, be more generous with how
22075 much bandwidth we'll use up before entering "soft hibernation".
22076 Previously, we'd refuse new connections and circuits once we'd
22077 used up 95% of our allotment. Now, we use up 95% of our allotment,
22078 AND make sure that we have no more than 500MB (or 3 hours of
22079 expected traffic, whichever is lower) remaining before we enter
22081 - Relays now log the reason for publishing a new relay descriptor,
22082 so we have a better chance of hunting down instances of bug 1810.
22083 Resolves ticket 3252.
22084 - Log a little more clearly about the times at which we're no longer
22085 accepting new connections (e.g. due to hibernating). Resolves
22087 - When AllowSingleHopExits is set, print a warning to explain to the
22088 relay operator why most clients are avoiding her relay.
22089 - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
22090 Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
22091 clients are already deprecated because of security bugs.
22093 o Minor features (network statistics):
22094 - Directory mirrors that set "DirReqStatistics 1" write statistics
22095 about directory requests to disk every 24 hours. As compared to the
22096 "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
22097 improvements: 1) stats are written to disk exactly every 24 hours;
22098 2) estimated shares of v2 and v3 requests are determined as mean
22099 values, not at the end of a measurement period; 3) unresolved
22100 requests are listed with country code '??'; 4) directories also
22101 measure download times.
22102 - Exit nodes that set "ExitPortStatistics 1" write statistics on the
22103 number of exit streams and transferred bytes per port to disk every
22105 - Relays that set "CellStatistics 1" write statistics on how long
22106 cells spend in their circuit queues to disk every 24 hours.
22107 - Entry nodes that set "EntryStatistics 1" write statistics on the
22108 rough number and origins of connecting clients to disk every 24
22110 - Relays that write any of the above statistics to disk and set
22111 "ExtraInfoStatistics 1" include the past 24 hours of statistics in
22112 their extra-info documents. Implements proposal 166.
22114 o Minor features (GeoIP and statistics):
22115 - Provide a log message stating which geoip file we're parsing
22116 instead of just stating that we're parsing the geoip file.
22117 Implements ticket 2432.
22118 - Make sure every relay writes a state file at least every 12 hours.
22119 Previously, a relay could go for weeks without writing its state
22120 file, and on a crash could lose its bandwidth history, capacity
22121 estimates, client country statistics, and so on. Addresses bug 3012.
22122 - Relays report the number of bytes spent on answering directory
22123 requests in extra-info descriptors similar to {read,write}-history.
22124 Implements enhancement 1790.
22125 - Report only the top 10 ports in exit-port stats in order not to
22126 exceed the maximum extra-info descriptor length of 50 KB. Implements
22128 - If writing the state file to disk fails, wait up to an hour before
22129 retrying again, rather than trying again each second. Fixes bug
22130 2346; bugfix on Tor 0.1.1.3-alpha.
22131 - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
22132 when we switch from being a public relay to a bridge. Otherwise
22133 there will still be clients that see the relay in their consensus,
22134 and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
22136 - Update to the August 2 2011 Maxmind GeoLite Country database.
22138 o Minor features (clients):
22139 - When expiring circuits, use microsecond timers rather than
22140 one-second timers. This can avoid an unpleasant situation where a
22141 circuit is launched near the end of one second and expired right
22142 near the beginning of the next, and prevent fluctuations in circuit
22144 - If we've configured EntryNodes and our network goes away and/or all
22145 our entrynodes get marked down, optimistically retry them all when
22146 a new socks application request appears. Fixes bug 1882.
22147 - Always perform router selections using weighted relay bandwidth,
22148 even if we don't need a high capacity circuit at the time. Non-fast
22149 circuits now only differ from fast ones in that they can use relays
22150 not marked with the Fast flag. This "feature" could turn out to
22151 be a horrible bug; we should investigate more before it goes into
22153 - When we run out of directory information such that we can't build
22154 circuits, but then get enough that we can build circuits, log when
22155 we actually construct a circuit, so the user has a better chance of
22156 knowing what's going on. Fixes bug 1362.
22157 - Log SSL state transitions at debug level during handshake, and
22158 include SSL states in error messages. This may help debug future
22159 SSL handshake issues.
22161 o Minor features (directory authorities):
22162 - When a router changes IP address or port, authorities now launch
22163 a new reachability test for it. Implements ticket 1899.
22164 - Directory authorities now reject relays running any versions of
22165 Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
22166 known bugs that keep RELAY_EARLY cells from working on rendezvous
22167 circuits. Followup to fix for bug 2081.
22168 - Directory authorities now reject relays running any version of Tor
22169 older than 0.2.0.26-rc. That version is the earliest that fetches
22170 current directory information correctly. Fixes bug 2156.
22171 - Directory authorities now do an immediate reachability check as soon
22172 as they hear about a new relay. This change should slightly reduce
22173 the time between setting up a relay and getting listed as running
22174 in the consensus. It should also improve the time between setting
22175 up a bridge and seeing use by bridge users.
22176 - Directory authorities no longer launch a TLS connection to every
22177 relay as they startup. Now that we have 2k+ descriptors cached,
22178 the resulting network hiccup is becoming a burden. Besides,
22179 authorities already avoid voting about Running for the first half
22180 hour of their uptime.
22181 - Directory authorities now log the source of a rejected POSTed v3
22182 networkstatus vote, so we can track failures better.
22183 - Backport code from 0.2.3.x that allows directory authorities to
22184 clean their microdescriptor caches. Needed to resolve bug 2230.
22186 o Minor features (hidden services):
22187 - Use computed circuit-build timeouts to decide when to launch
22188 parallel introduction circuits for hidden services. (Previously,
22189 we would retry after 15 seconds.)
22190 - Don't allow v0 hidden service authorities to act as clients.
22191 Required by fix for bug 3000.
22192 - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
22193 by fix for bug 3000.
22194 - Make hidden services work better in private Tor networks by not
22195 requiring any uptime to join the hidden service descriptor
22196 DHT. Implements ticket 2088.
22197 - Log (at info level) when purging pieces of hidden-service-client
22198 state because of SIGNAL NEWNYM.
22200 o Minor features (controller interface):
22201 - New "GETINFO net/listeners/(type)" controller command to return
22202 a list of addresses and ports that are bound for listeners for a
22203 given connection type. This is useful when the user has configured
22204 "SocksPort auto" and the controller needs to know which port got
22205 chosen. Resolves another part of ticket 3076.
22206 - Have the controller interface give a more useful message than
22207 "Internal Error" in response to failed GETINFO requests.
22208 - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
22209 event, to give information on the current rate of circuit timeouts
22210 over our stored history.
22211 - The 'EXTENDCIRCUIT' control port command can now be used with
22212 a circ id of 0 and no path. This feature will cause Tor to build
22213 a new 'fast' general purpose circuit using its own path selection
22215 - Added a BUILDTIMEOUT_SET controller event to describe changes
22216 to the circuit build timeout.
22217 - New controller command "getinfo config-text". It returns the
22218 contents that Tor would write if you send it a SAVECONF command,
22219 so the controller can write the file to disk itself.
22221 o Minor features (controller protocol):
22222 - Add a new ControlSocketsGroupWritable configuration option: when
22223 it is turned on, ControlSockets are group-writeable by the default
22224 group of the current user. Patch by Jérémy Bobbio; implements
22226 - Tor now refuses to create a ControlSocket in a directory that is
22227 world-readable (or group-readable if ControlSocketsGroupWritable
22228 is 0). This is necessary because some operating systems do not
22229 enforce permissions on an AF_UNIX sockets. Permissions on the
22230 directory holding the socket, however, seems to work everywhere.
22231 - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
22232 not. This would lead to a cookie that is still not group readable.
22233 Closes bug 1843. Suggested by katmagic.
22234 - Future-proof the controller protocol a bit by ignoring keyword
22235 arguments we do not recognize.
22237 o Minor features (more useful logging):
22238 - Revise most log messages that refer to nodes by nickname to
22239 instead use the "$key=nickname at address" format. This should be
22240 more useful, especially since nicknames are less and less likely
22241 to be unique. Resolves ticket 3045.
22242 - When an HTTPS proxy reports "403 Forbidden", we now explain
22243 what it means rather than calling it an unexpected status code.
22244 Closes bug 2503. Patch from Michael Yakubovich.
22245 - Rate-limit a warning about failures to download v2 networkstatus
22246 documents. Resolves part of bug 1352.
22247 - Rate-limit the "your application is giving Tor only an IP address"
22248 warning. Addresses bug 2000; bugfix on 0.0.8pre2.
22249 - Rate-limit "Failed to hand off onionskin" warnings.
22250 - When logging a rate-limited warning, we now mention how many messages
22251 got suppressed since the last warning.
22252 - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
22253 2 no signature, 4 required" messages about consensus signatures
22254 easier to read, and make sure they get logged at the same severity
22255 as the messages explaining which keys are which. Fixes bug 1290.
22256 - Don't warn when we have a consensus that we can't verify because
22257 of missing certificates, unless those certificates are ones
22258 that we have been trying and failing to download. Fixes bug 1145.
22260 o Minor features (log domains):
22261 - Add documentation for configuring logging at different severities in
22262 different log domains. We've had this feature since 0.2.1.1-alpha,
22263 but for some reason it never made it into the manpage. Fixes
22265 - Make it simpler to specify "All log domains except for A and B".
22266 Previously you needed to say "[*,~A,~B]". Now you can just say
22268 - Add a "LogMessageDomains 1" option to include the domains of log
22269 messages along with the messages. Without this, there's no way
22270 to use log domains without reading the source or doing a lot
22272 - Add a new "Handshake" log domain for activities that happen
22273 during the TLS handshake.
22275 o Minor features (build process):
22276 - Make compilation with clang possible when using
22277 "--enable-gcc-warnings" by removing two warning options that clang
22278 hasn't implemented yet and by fixing a few warnings. Resolves
22280 - Detect platforms that brokenly use a signed size_t, and refuse to
22281 build there. Found and analyzed by doorss and rransom.
22282 - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
22284 - Add support for statically linking zlib by specifying
22285 "--enable-static-zlib", to go with our support for statically
22286 linking openssl and libevent. Resolves bug 1358.
22287 - Instead of adding the svn revision to the Tor version string, report
22288 the git commit (when we're building from a git checkout).
22289 - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
22291 - New --digests command-line switch to output the digests of the
22292 source files Tor was built with.
22293 - Generate our manpage and HTML documentation using Asciidoc. This
22294 change should make it easier to maintain the documentation, and
22295 produce nicer HTML. The build process fails if asciidoc cannot
22296 be found and building with asciidoc isn't disabled (via the
22297 "--disable-asciidoc" argument to ./configure. Skipping the manpage
22298 speeds up the build considerably.
22300 o Minor features (options / torrc):
22301 - Warn when the same option is provided more than once in a torrc
22302 file, on the command line, or in a single SETCONF statement, and
22303 the option is one that only accepts a single line. Closes bug 1384.
22304 - Warn when the user configures two HiddenServiceDir lines that point
22305 to the same directory. Bugfix on 0.0.6 (the version introducing
22306 HiddenServiceDir); fixes bug 3289.
22307 - Add new "perconnbwrate" and "perconnbwburst" consensus params to
22308 do individual connection-level rate limiting of clients. The torrc
22309 config options with the same names trump the consensus params, if
22310 both are present. Replaces the old "bwconnrate" and "bwconnburst"
22311 consensus params which were broken from 0.2.2.7-alpha through
22312 0.2.2.14-alpha. Closes bug 1947.
22313 - New config option "WarnUnsafeSocks 0" disables the warning that
22314 occurs whenever Tor receives a socks handshake using a version of
22315 the socks protocol that can only provide an IP address (rather
22316 than a hostname). Setups that do DNS locally over Tor are fine,
22317 and we shouldn't spam the logs in that case.
22318 - New config option "CircuitStreamTimeout" to override our internal
22319 timeout schedule for how many seconds until we detach a stream from
22320 a circuit and try a new circuit. If your network is particularly
22321 slow, you might want to set this to a number like 60.
22322 - New options for SafeLogging to allow scrubbing only log messages
22323 generated while acting as a relay. Specify "SafeLogging relay" if
22324 you want to ensure that only messages known to originate from
22325 client use of the Tor process will be logged unsafely.
22326 - Time and memory units in the configuration file can now be set to
22327 fractional units. For example, "2.5 GB" is now a valid value for
22329 - Support line continuations in the torrc config file. If a line
22330 ends with a single backslash character, the newline is ignored, and
22331 the configuration value is treated as continuing on the next line.
22334 o Minor features (unit tests):
22335 - Revise our unit tests to use the "tinytest" framework, so we
22336 can run tests in their own processes, have smarter setup/teardown
22337 code, and so on. The unit test code has moved to its own
22338 subdirectory, and has been split into multiple modules.
22339 - Add a unit test for cross-platform directory-listing code.
22340 - Add some forgotten return value checks during unit tests. Found
22342 - Use GetTempDir to find the proper temporary directory location on
22343 Windows when generating temporary files for the unit tests. Patch
22346 o Minor features (misc):
22347 - The "torify" script now uses torsocks where available.
22348 - Make Libevent log messages get delivered to controllers later,
22349 and not from inside the Libevent log handler. This prevents unsafe
22350 reentrant Libevent calls while still letting the log messages
22352 - Certain Tor clients (such as those behind check.torproject.org) may
22353 want to fetch the consensus in an extra early manner. To enable this
22354 a user may now set FetchDirInfoExtraEarly to 1. This also depends on
22355 setting FetchDirInfoEarly to 1. Previous behavior will stay the same
22356 as only certain clients who must have this information sooner should
22358 - Expand homedirs passed to tor-checkkey. This should silence a
22359 coverity complaint about passing a user-supplied string into
22360 open() without checking it.
22361 - Make sure to disable DirPort if running as a bridge. DirPorts aren't
22362 used on bridges, and it makes bridge scanning somewhat easier.
22363 - Create the /var/run/tor directory on startup on OpenSUSE if it is
22364 not already created. Patch from Andreas Stieger. Fixes bug 2573.
22366 o Minor bugfixes (relays):
22367 - When a relay decides that its DNS is too broken for it to serve
22368 as an exit server, it advertised itself as a non-exit, but
22369 continued to act as an exit. This could create accidental
22370 partitioning opportunities for users. Instead, if a relay is
22371 going to advertise reject *:* as its exit policy, it should
22372 really act with exit policy "reject *:*". Fixes bug 2366.
22373 Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
22374 - Publish a router descriptor even if generating an extra-info
22375 descriptor fails. Previously we would not publish a router
22376 descriptor without an extra-info descriptor; this can cause fast
22377 exit relays collecting exit-port statistics to drop from the
22378 consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
22379 - When we're trying to guess whether we know our IP address as
22380 a relay, we would log various ways that we failed to guess
22381 our address, but never log that we ended up guessing it
22382 successfully. Now add a log line to help confused and anxious
22383 relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
22384 - For bandwidth accounting, calculate our expected bandwidth rate
22385 based on the time during which we were active and not in
22386 soft-hibernation during the last interval. Previously, we were
22387 also considering the time spent in soft-hibernation. If this
22388 was a long time, we would wind up underestimating our bandwidth
22389 by a lot, and skewing our wakeup time towards the start of the
22390 accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
22391 - Demote a confusing TLS warning that relay operators might get when
22392 someone tries to talk to their ORPort. It is not the operator's
22393 fault, nor can they do anything about it. Fixes bug 1364; bugfix
22395 - Change "Application request when we're believed to be offline."
22396 notice to "Application request when we haven't used client
22397 functionality lately.", to clarify that it's not an error. Bugfix
22398 on 0.0.9.3; fixes bug 1222.
22400 o Minor bugfixes (bridges):
22401 - When a client starts or stops using bridges, never use a circuit
22402 that was built before the configuration change. This behavior could
22403 put at risk a user who uses bridges to ensure that her traffic
22404 only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
22406 - Do not reset the bridge descriptor download status every time we
22407 re-parse our configuration or get a configuration change. Fixes
22408 bug 3019; bugfix on 0.2.0.3-alpha.
22409 - Users couldn't configure a regular relay to be their bridge. It
22410 didn't work because when Tor fetched the bridge descriptor, it found
22411 that it already had it, and didn't realize that the purpose of the
22412 descriptor had changed. Now we replace routers with a purpose other
22413 than bridge with bridge descriptors when fetching them. Bugfix on
22414 0.1.1.9-alpha. Fixes bug 1776.
22415 - In the special case where you configure a public exit relay as your
22416 bridge, Tor would be willing to use that exit relay as the last
22417 hop in your circuit as well. Now we fail that circuit instead.
22418 Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
22420 o Minor bugfixes (clients):
22421 - We now ask the other side of a stream (the client or the exit)
22422 for more data on that stream when the amount of queued data on
22423 that stream dips low enough. Previously, we wouldn't ask the
22424 other side for more data until either it sent us more data (which
22425 it wasn't supposed to do if it had exhausted its window!) or we
22426 had completely flushed all our queued data. This flow control fix
22427 should improve throughput. Fixes bug 2756; bugfix on the earliest
22428 released versions of Tor (svn commit r152).
22429 - When a client finds that an origin circuit has run out of 16-bit
22430 stream IDs, we now mark it as unusable for new streams. Previously,
22431 we would try to close the entire circuit. Bugfix on 0.0.6.
22432 - Make it explicit that we don't cannibalize one-hop circuits. This
22433 happens in the wild, but doesn't turn out to be a problem because
22434 we fortunately don't use those circuits. Many thanks to outofwords
22435 for the initial analysis and to swissknife who confirmed that
22436 two-hop circuits are actually created.
22437 - Resolve an edge case in path weighting that could make us misweight
22438 our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
22439 - Make the DNSPort option work with libevent 2.x. Don't alter the
22440 behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
22442 o Minor bugfixes (directory authorities):
22443 - Make directory authorities more accurate at recording when
22444 relays that have failed several reachability tests became
22445 unreachable, so we can provide more accuracy at assigning Stable,
22446 Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
22447 - Directory authorities are now more robust to hops back in time
22448 when calculating router stability. Previously, if a run of uptime
22449 or downtime appeared to be negative, the calculation could give
22450 incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
22452 - Directory authorities will now attempt to download consensuses
22453 if their own efforts to make a live consensus have failed. This
22454 change means authorities that restart will fetch a valid
22455 consensus, and it means authorities that didn't agree with the
22456 current consensus will still fetch and serve it if it has enough
22457 signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
22458 - Never vote for a server as "Running" if we have a descriptor for
22459 it claiming to be hibernating, and that descriptor was published
22460 more recently than our last contact with the server. Bugfix on
22461 0.2.0.3-alpha; fixes bug 911.
22462 - Directory authorities no longer change their opinion of, or vote on,
22463 whether a router is Running, unless they have themselves been
22464 online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
22467 o Minor bugfixes (hidden services):
22468 - Log malformed requests for rendezvous descriptors as protocol
22469 warnings, not warnings. Also, use a more informative log message
22470 in case someone sees it at log level warning without prior
22471 info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
22472 - Accept hidden service descriptors if we think we might be a hidden
22473 service directory, regardless of what our consensus says. This
22474 helps robustness, since clients and hidden services can sometimes
22475 have a more up-to-date view of the network consensus than we do,
22476 and if they think that the directory authorities list us a HSDir,
22477 we might actually be one. Related to bug 2732; bugfix on
22479 - Correct the warning displayed when a rendezvous descriptor exceeds
22480 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
22482 - Clients and hidden services now use HSDir-flagged relays for hidden
22483 service descriptor downloads and uploads even if the relays have no
22484 DirPort set and the client has disabled TunnelDirConns. This will
22485 eventually allow us to give the HSDir flag to relays with no
22486 DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
22487 - Only limit the lengths of single HS descriptors, even when multiple
22488 HS descriptors are published to an HSDir relay in a single POST
22489 operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
22491 o Minor bugfixes (controllers):
22492 - Allow GETINFO fingerprint to return a fingerprint even when
22493 we have not yet built a router descriptor. Fixes bug 3577;
22494 bugfix on 0.2.0.1-alpha.
22495 - Send a SUCCEEDED stream event to the controller when a reverse
22496 resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
22497 discovered by katmagic.
22498 - Remove a trailing asterisk from "exit-policy/default" in the
22499 output of the control port command "GETINFO info/names". Bugfix
22501 - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
22502 2917. Bugfix on 0.1.1.1-alpha.
22503 - When we restart our relay, we might get a successful connection
22504 from the outside before we've started our reachability tests,
22505 triggering a warning: "ORPort found reachable, but I have no
22506 routerinfo yet. Failing to inform controller of success." This
22507 bug was harmless unless Tor is running under a controller
22508 like Vidalia, in which case the controller would never get a
22509 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
22511 - When a controller changes TrackHostExits, remove mappings for
22512 hosts that should no longer have their exits tracked. Bugfix on
22514 - When a controller changes VirtualAddrNetwork, remove any mappings
22515 for hosts that were automapped to the old network. Bugfix on
22517 - When a controller changes one of the AutomapHosts* options, remove
22518 any mappings for hosts that should no longer be automapped. Bugfix
22520 - Fix an off-by-one error in calculating some controller command
22521 argument lengths. Fortunately, this mistake is harmless since
22522 the controller code does redundant NUL termination too. Found by
22523 boboper. Bugfix on 0.1.1.1-alpha.
22524 - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
22525 would return "551 Internal error" rather than "552 Unrecognized key
22526 ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
22527 - Don't spam the controller with events when we have no file
22528 descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
22529 for log messages was already solved from bug 748.)
22530 - Emit a GUARD DROPPED controller event for a case we missed.
22531 - Ensure DNS requests launched by "RESOLVE" commands from the
22532 controller respect the __LeaveStreamsUnattached setconf options. The
22533 same goes for requests launched via DNSPort or transparent
22534 proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
22536 o Minor bugfixes (config options):
22537 - Tor used to limit HttpProxyAuthenticator values to 48 characters.
22538 Change the limit to 512 characters by removing base64 newlines.
22539 Fixes bug 2752. Fix by Michael Yakubovich.
22540 - Complain if PublishServerDescriptor is given multiple arguments that
22541 include 0 or 1. This configuration will be rejected in the future.
22542 Bugfix on 0.2.0.1-alpha; closes bug 1107.
22543 - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
22544 Bugfix on 0.2.0.13-alpha; closes bug 928.
22546 o Minor bugfixes (log subsystem fixes):
22547 - When unable to format an address as a string, report its value
22548 as "???" rather than reusing the last formatted address. Bugfix
22550 - Be more consistent in our treatment of file system paths. "~" should
22551 get expanded to the user's home directory in the Log config option.
22552 Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
22553 feature for the -f and --DataDirectory options.
22555 o Minor bugfixes (memory management):
22556 - Don't stack-allocate the list of supplementary GIDs when we're
22557 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
22558 could take up to 256K, which is way too much stack. Found by
22559 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
22560 - Save a couple bytes in memory allocation every time we escape
22561 certain characters in a string. Patch from Florian Zumbiehl.
22563 o Minor bugfixes (protocol correctness):
22564 - When checking for 1024-bit keys, check for 1024 bits, not 128
22565 bytes. This allows Tor to correctly discard keys of length 1017
22566 through 1023. Bugfix on 0.0.9pre5.
22567 - Require that introduction point keys and onion handshake keys
22568 have a public exponent of 65537. Starts to fix bug 3207; bugfix
22570 - Handle SOCKS messages longer than 128 bytes long correctly, rather
22571 than waiting forever for them to finish. Fixes bug 2330; bugfix
22572 on 0.2.0.16-alpha. Found by doorss.
22573 - Never relay a cell for a circuit we have already destroyed.
22574 Between marking a circuit as closeable and finally closing it,
22575 it may have been possible for a few queued cells to get relayed,
22576 even though they would have been immediately dropped by the next
22577 OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
22578 - Never queue a cell for a circuit that's already been marked
22580 - Fix a spec conformance issue: the network-status-version token
22581 must be the first token in a v3 consensus or vote. Discovered by
22582 "parakeep". Bugfix on 0.2.0.3-alpha.
22583 - A networkstatus vote must contain exactly one signature. Spec
22584 conformance issue. Bugfix on 0.2.0.3-alpha.
22585 - When asked about a DNS record type we don't support via a
22586 client DNSPort, reply with NOTIMPL rather than an empty
22587 reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
22588 - Make more fields in the controller protocol case-insensitive, since
22589 control-spec.txt said they were.
22591 o Minor bugfixes (log messages):
22592 - Fix a log message that said "bits" while displaying a value in
22593 bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
22595 - Downgrade "no current certificates known for authority" message from
22596 Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
22597 - Correctly describe errors that occur when generating a TLS object.
22598 Previously we would attribute them to a failure while generating a
22599 TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
22601 - Fix an instance where a Tor directory mirror might accidentally
22602 log the IP address of a misbehaving Tor client. Bugfix on
22604 - Stop logging at severity 'warn' when some other Tor client tries
22605 to establish a circuit with us using weak DH keys. It's a protocol
22606 violation, but that doesn't mean ordinary users need to hear about
22607 it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
22608 - If your relay can't keep up with the number of incoming create
22609 cells, it would log one warning per failure into your logs. Limit
22610 warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
22612 o Minor bugfixes (build fixes):
22613 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
22614 - When warning about missing zlib development packages during compile,
22615 give the correct package names. Bugfix on 0.2.0.1-alpha.
22616 - Fix warnings that newer versions of autoconf produce during
22617 ./autogen.sh. These warnings appear to be harmless in our case,
22618 but they were extremely verbose. Fixes bug 2020.
22619 - Squash a compile warning on OpenBSD. Reported by Tas; fixes
22622 o Minor bugfixes (portability):
22623 - Write several files in text mode, on OSes that distinguish text
22624 mode from binary mode (namely, Windows). These files are:
22625 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
22626 that collect those statistics; 'client_keys' and 'hostname' for
22627 hidden services that use authentication; and (in the tor-gencert
22628 utility) newly generated identity and signing keys. Previously,
22629 we wouldn't specify text mode or binary mode, leading to an
22630 assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
22631 the DirRecordUsageByCountry option which would have triggered
22632 the assertion failure was added), although this assertion failure
22633 would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
22634 - Selectively disable deprecation warnings on OS X because Lion
22635 started deprecating the shipped copy of openssl. Fixes bug 3643.
22636 - Use a wide type to hold sockets when built for 64-bit Windows.
22638 - Fix an issue that prevented static linking of libevent on
22639 some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
22640 where we introduced the "--with-static-libevent" configure option.
22641 - Fix a bug with our locking implementation on Windows that couldn't
22642 correctly detect when a file was already locked. Fixes bug 2504,
22643 bugfix on 0.2.1.6-alpha.
22644 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
22646 - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
22647 Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
22650 o Minor bugfixes (code correctness):
22651 - Always NUL-terminate the sun_path field of a sockaddr_un before
22652 passing it to the kernel. (Not a security issue: kernels are
22653 smart enough to reject bad sockaddr_uns.) Found by Coverity;
22654 CID #428. Bugfix on Tor 0.2.0.3-alpha.
22655 - Make connection_printf_to_buf()'s behavior sane. Its callers
22656 expect it to emit a CRLF iff the format string ends with CRLF;
22657 it actually emitted a CRLF iff (a) the format string ended with
22658 CRLF or (b) the resulting string was over 1023 characters long or
22659 (c) the format string did not end with CRLF *and* the resulting
22660 string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
22661 fixes part of bug 3407.
22662 - Make send_control_event_impl()'s behavior sane. Its callers
22663 expect it to always emit a CRLF at the end of the string; it
22664 might have emitted extra control characters as well. Bugfix on
22665 0.1.1.9-alpha; fixes another part of bug 3407.
22666 - Make crypto_rand_int() check the value of its input correctly.
22667 Previously, it accepted values up to UINT_MAX, but could return a
22668 negative number if given a value above INT_MAX+1. Found by George
22669 Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
22670 - Fix a potential null-pointer dereference while computing a
22671 consensus. Bugfix on 0.2.0.3-alpha, found with the help of
22673 - If we fail to compute the identity digest of a v3 legacy keypair,
22674 warn, and don't use a buffer-full of junk instead. Bugfix on
22675 0.2.1.1-alpha; fixes bug 3106.
22676 - Resolve an untriggerable issue in smartlist_string_num_isin(),
22677 where if the function had ever in the future been used to check
22678 for the presence of a too-large number, it would have given an
22679 incorrect result. (Fortunately, we only used it for 16-bit
22680 values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
22681 - Be more careful about reporting the correct error from a failed
22682 connect() system call. Under some circumstances, it was possible to
22683 look at an incorrect value for errno when sending the end reason.
22684 Bugfix on 0.1.0.1-rc.
22685 - Correctly handle an "impossible" overflow cases in connection byte
22686 counting, where we write or read more than 4GB on an edge connection
22687 in a single second. Bugfix on 0.1.2.8-beta.
22688 - Avoid a double mark-for-free warning when failing to attach a
22689 transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
22691 - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
22692 found by "cypherpunks". This bug was introduced before the first
22693 Tor release, in svn commit r110.
22694 - Fix a bug in bandwidth history state parsing that could have been
22695 triggered if a future version of Tor ever changed the timing
22696 granularity at which bandwidth history is measured. Bugfix on
22697 Tor 0.1.1.11-alpha.
22698 - Add assertions to check for overflow in arguments to
22699 base32_encode() and base32_decode(); fix a signed-unsigned
22700 comparison there too. These bugs are not actually reachable in Tor,
22701 but it's good to prevent future errors too. Found by doorss.
22702 - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
22704 - Set target port in get_interface_address6() correctly. Bugfix
22705 on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
22706 - Fix an impossible-to-actually-trigger buffer overflow in relay
22707 descriptor generation. Bugfix on 0.1.0.15.
22708 - Fix numerous small code-flaws found by Coverity Scan Rung 3.
22710 o Minor bugfixes (code improvements):
22711 - After we free an internal connection structure, overwrite it
22712 with a different memory value than we use for overwriting a freed
22713 internal circuit structure. Should help with debugging. Suggested
22715 - If OpenSSL fails to make a duplicate of a private or public key, log
22716 an error message and try to exit cleanly. May help with debugging
22717 if bug 1209 ever remanifests.
22718 - Some options used different conventions for uppercasing of acronyms
22719 when comparing manpage and source. Fix those in favor of the
22720 manpage, as it makes sense to capitalize acronyms.
22721 - Take a first step towards making or.h smaller by splitting out
22722 function definitions for all source files in src/or/. Leave
22723 structures and defines in or.h for now.
22724 - Remove a few dead assignments during router parsing. Found by
22726 - Don't use 1-bit wide signed bit fields. Found by coverity.
22727 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
22728 None of the cases where we did this before were wrong, but by making
22729 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
22730 - The memarea code now uses a sentinel value at the end of each area
22731 to make sure nothing writes beyond the end of an area. This might
22732 help debug some conceivable causes of bug 930.
22733 - Always treat failure to allocate an RSA key as an unrecoverable
22735 - Add some more defensive programming for architectures that can't
22736 handle unaligned integer accesses. We don't know of any actual bugs
22737 right now, but that's the best time to fix them. Fixes bug 1943.
22739 o Minor bugfixes (misc):
22740 - Fix a rare bug in rend_fn unit tests: we would fail a test when
22741 a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
22742 on 0.2.0.10-alpha; fixes bug 1808.
22743 - Where available, use Libevent 2.0's periodic timers so that our
22744 once-per-second cleanup code gets called even more closely to
22745 once per second than it would otherwise. Fixes bug 943.
22746 - Ignore OutboundBindAddress when connecting to localhost.
22747 Connections to localhost need to come _from_ localhost, or else
22748 local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
22750 - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
22752 - If any of the v3 certs we download are unparseable, we should
22753 actually notice the failure so we don't retry indefinitely. Bugfix
22754 on 0.2.0.x; reported by "rotator".
22755 - When Tor fails to parse a descriptor of any kind, dump it to disk.
22756 Might help diagnosing bug 1051.
22757 - Make our 'torify' script more portable; if we have only one of
22758 'torsocks' or 'tsocks' installed, don't complain to the user;
22759 and explain our warning about tsocks better.
22760 - Fix some urls in the exit notice file and make it XHTML1.1 strict
22761 compliant. Based on a patch from Christian Kujau.
22763 o Documentation changes:
22764 - Modernize the doxygen configuration file slightly. Fixes bug 2707.
22765 - Resolve all doxygen warnings except those for missing documentation.
22767 - Add doxygen documentation for more functions, fields, and types.
22768 - Convert the HACKING file to asciidoc, and add a few new sections
22769 to it, explaining how we use Git, how we make changelogs, and
22770 what should go in a patch.
22771 - Document the default socks host and port (127.0.0.1:9050) for
22773 - Removed some unnecessary files from the source distribution. The
22774 AUTHORS file has now been merged into the people page on the
22775 website. The roadmaps and design doc can now be found in the
22776 projects directory in svn.
22778 o Deprecated and removed features (config):
22779 - Remove the torrc.complete file. It hasn't been kept up to date
22780 and users will have better luck checking out the manpage.
22781 - Remove the HSAuthorityRecordStats option that version 0 hidden
22782 service authorities could use to track statistics of overall v0
22783 hidden service usage.
22784 - Remove the obsolete "NoPublish" option; it has been flagged
22785 as obsolete and has produced a warning since 0.1.1.18-rc.
22786 - Caches no longer download and serve v2 networkstatus documents
22787 unless FetchV2Networkstatus flag is set: these documents haven't
22788 haven't been used by clients or relays since 0.2.0.x. Resolves
22791 o Deprecated and removed features (controller):
22792 - The controller no longer accepts the old obsolete "addr-mappings/"
22793 or "unregistered-servers-" GETINFO values.
22794 - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
22795 always on; using them is necessary for correct forward-compatible
22798 o Deprecated and removed features (misc):
22799 - Hidden services no longer publish version 0 descriptors, and clients
22800 do not request or use version 0 descriptors. However, the old hidden
22801 service authorities still accept and serve version 0 descriptors
22802 when contacted by older hidden services/clients.
22803 - Remove undocumented option "-F" from tor-resolve: it hasn't done
22804 anything since 0.2.1.16-rc.
22805 - Remove everything related to building the expert bundle for OS X.
22806 It has confused many users, doesn't work right on OS X 10.6,
22807 and is hard to get rid of once installed. Resolves bug 1274.
22808 - Remove support for .noconnect style addresses. Nobody was using
22809 them, and they provided another avenue for detecting Tor users
22810 via application-level web tricks.
22811 - When we fixed bug 1038 we had to put in a restriction not to send
22812 RELAY_EARLY cells on rend circuits. This was necessary as long
22813 as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
22814 active. Now remove this obsolete check. Resolves bug 2081.
22815 - Remove workaround code to handle directory responses from servers
22816 that had bug 539 (they would send HTTP status 503 responses _and_
22817 send a body too). Since only server versions before
22818 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
22819 keep the workaround in place.
22820 - Remove the old 'fuzzy time' logic. It was supposed to be used for
22821 handling calculations where we have a known amount of clock skew and
22822 an allowed amount of unknown skew. But we only used it in three
22823 places, and we never adjusted the known/unknown skew values. This is
22824 still something we might want to do someday, but if we do, we'll
22825 want to do it differently.
22826 - Remove the "--enable-iphone" option to ./configure. According to
22827 reports from Marco Bonetti, Tor builds fine without any special
22828 tweaking on recent iPhone SDK versions.
22831 Changes in version 0.2.1.30 - 2011-02-23
22832 Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
22833 change is a slight tweak to Tor's TLS handshake that makes relays
22834 and bridges that run this new version reachable from Iran again.
22835 We don't expect this tweak will win the arms race long-term, but it
22836 buys us time until we roll out a better solution.
22839 - Stop sending a CLOCK_SKEW controller status event whenever
22840 we fetch directory information from a relay that has a wrong clock.
22841 Instead, only inform the controller when it's a trusted authority
22842 that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
22843 the rest of bug 1074.
22844 - Fix a bounds-checking error that could allow an attacker to
22845 remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
22846 Found by "piebeer".
22847 - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
22848 Tor would ignore their RelayBandwidthBurst setting,
22849 potentially using more bandwidth than expected. Bugfix on
22850 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
22851 - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
22852 hidserv" in her torrc. The 'hidserv' argument never controlled
22853 publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
22856 - Adjust our TLS Diffie-Hellman parameters to match those used by
22858 - Update to the February 1 2011 Maxmind GeoLite Country database.
22861 - Check for and reject overly long directory certificates and
22862 directory tokens before they have a chance to hit any assertions.
22863 Bugfix on 0.2.1.28. Found by "doorss".
22864 - Bring the logic that gathers routerinfos and assesses the
22865 acceptability of circuits into line. This prevents a Tor OP from
22866 getting locked in a cycle of choosing its local OR as an exit for a
22867 path (due to a .exit request) and then rejecting the circuit because
22868 its OR is not listed yet. It also prevents Tor clients from using an
22869 OR running in the same instance as an exit (due to a .exit request)
22870 if the OR does not meet the same requirements expected of an OR
22871 running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
22873 o Packaging changes:
22874 - Stop shipping the Tor specs files and development proposal documents
22875 in the tarball. They are now in a separate git repository at
22876 git://git.torproject.org/torspec.git
22877 - Do not include Git version tags as though they are SVN tags when
22878 generating a tarball from inside a repository that has switched
22879 between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
22882 Changes in version 0.2.1.29 - 2011-01-15
22883 Tor 0.2.1.29 continues our recent code security audit work. The main
22884 fix resolves a remote heap overflow vulnerability that can allow remote
22885 code execution. Other fixes address a variety of assert and crash bugs,
22886 most of which we think are hard to exploit remotely.
22888 o Major bugfixes (security):
22889 - Fix a heap overflow bug where an adversary could cause heap
22890 corruption. This bug probably allows remote code execution
22891 attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
22893 - Prevent a denial-of-service attack by disallowing any
22894 zlib-compressed data whose compression factor is implausibly
22895 high. Fixes part of bug 2324; reported by "doorss".
22896 - Zero out a few more keys in memory before freeing them. Fixes
22897 bug 2384 and part of bug 2385. These key instances found by
22898 "cypherpunks", based on Andrew Case's report about being able
22899 to find sensitive data in Tor's memory space if you have enough
22900 permissions. Bugfix on 0.0.2pre9.
22902 o Major bugfixes (crashes):
22903 - Prevent calls to Libevent from inside Libevent log handlers.
22904 This had potential to cause a nasty set of crashes, especially
22905 if running Libevent with debug logging enabled, and running
22906 Tor with a controller watching for low-severity log messages.
22907 Bugfix on 0.1.0.2-rc. Fixes bug 2190.
22908 - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
22909 underflow errors there too. Fixes the other part of bug 2324.
22910 - Fix a bug where we would assert if we ever had a
22911 cached-descriptors.new file (or another file read directly into
22912 memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
22913 on 0.2.1.25. Found by doorss.
22914 - Fix some potential asserts and parsing issues with grossly
22915 malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
22918 o Minor bugfixes (other):
22919 - Fix a bug with handling misformed replies to reverse DNS lookup
22920 requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
22921 bug reported by doorss.
22922 - Fix compilation on mingw when a pthreads compatibility library
22923 has been installed. (We don't want to use it, so we shouldn't
22924 be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
22925 - Fix a bug where we would declare that we had run out of virtual
22926 addresses when the address space was only half-exhausted. Bugfix
22928 - Correctly handle the case where AutomapHostsOnResolve is set but
22929 no virtual addresses are available. Fixes bug 2328; bugfix on
22930 0.1.2.1-alpha. Bug found by doorss.
22931 - Correctly handle wrapping around when we run out of virtual
22932 address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
22935 - Update to the January 1 2011 Maxmind GeoLite Country database.
22936 - Introduce output size checks on all of our decryption functions.
22939 - Tor does not build packages correctly with Automake 1.6 and earlier;
22940 added a check to Makefile.am to make sure that we're building with
22941 Automake 1.7 or later.
22942 - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
22943 because we built it with a too-old version of automake. Thus that
22944 release broke ./configure --enable-openbsd-malloc, which is popular
22945 among really fast exit relays on Linux.
22948 Changes in version 0.2.1.28 - 2010-12-17
22949 Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
22950 exploitable bugs. We also took this opportunity to change the IP address
22951 for one of our directory authorities, and to update the geoip database
22955 - Fix a remotely exploitable bug that could be used to crash instances
22956 of Tor remotely by overflowing on the heap. Remote-code execution
22957 hasn't been confirmed, but can't be ruled out. Everyone should
22958 upgrade. Bugfix on the 0.1.1 series and later.
22960 o Directory authority changes:
22961 - Change IP address and ports for gabelmoo (v3 directory authority).
22964 - Update to the December 1 2010 Maxmind GeoLite Country database.
22967 Changes in version 0.2.1.27 - 2010-11-23
22968 Yet another OpenSSL security patch broke its compatibility with Tor:
22969 Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
22970 also took this opportunity to fix several crash bugs, integrate a new
22971 directory authority, and update the bundled GeoIP database.
22974 - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
22975 No longer set the tlsext_host_name extension on server SSL objects;
22976 but continue to set it on client SSL objects. Our goal in setting
22977 it was to imitate a browser, not a vhosting server. Fixes bug 2204;
22978 bugfix on 0.2.1.1-alpha.
22979 - Do not log messages to the controller while shrinking buffer
22980 freelists. Doing so would sometimes make the controller connection
22981 try to allocate a buffer chunk, which would mess up the internals
22982 of the freelist and cause an assertion failure. Fixes bug 1125;
22983 fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
22984 - Learn our external IP address when we're a relay or bridge, even if
22985 we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
22986 where we introduced bridge relays that don't need to publish to
22987 be useful. Fixes bug 2050.
22988 - Do even more to reject (and not just ignore) annotations on
22989 router descriptors received anywhere but from the cache. Previously
22990 we would ignore such annotations at first, but cache them to disk
22991 anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
22992 - When you're using bridges and your network goes away and your
22993 bridges get marked as down, recover when you attempt a new socks
22994 connection (if the network is back), rather than waiting up to an
22995 hour to try fetching new descriptors for your bridges. Bugfix on
22996 0.2.0.3-alpha; fixes bug 1981.
22999 - Move to the November 2010 Maxmind GeoLite country db (rather
23000 than the June 2009 ip-to-country GeoIP db) for our statistics that
23001 count how many users relays are seeing from each country. Now we'll
23002 have more accurate data, especially for many African countries.
23004 o New directory authorities:
23005 - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
23009 - Fix an assertion failure that could occur in directory caches or
23010 bridge users when using a very short voting interval on a testing
23011 network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
23013 - Enforce multiplicity rules when parsing annotations. Bugfix on
23014 0.2.0.8-alpha. Found by piebeer.
23015 - Allow handshaking OR connections to take a full KeepalivePeriod
23016 seconds to handshake. Previously, we would close them after
23017 IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
23018 were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
23020 - When building with --enable-gcc-warnings on OpenBSD, disable
23021 warnings in system headers. This makes --enable-gcc-warnings
23022 pass on OpenBSD 4.8.
23025 - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
23026 and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
23027 stream ending reason for this case: END_STREAM_REASON_NOROUTE.
23028 Servers can start sending this code when enough clients recognize
23029 it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
23030 - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
23031 Patch from mingw-san.
23034 - Remove the old debian/ directory from the main Tor distribution.
23035 The official Tor-for-debian git repository lives at the URL
23036 https://git.torproject.org/debian/tor.git
23037 - Stop shipping the old doc/website/ directory in the tarball. We
23038 changed the website format in late 2010, and what we shipped in
23039 0.2.1.26 really wasn't that useful anyway.
23042 Changes in version 0.2.1.26 - 2010-05-02
23043 Tor 0.2.1.26 addresses the recent connection and memory overload
23044 problems we've been seeing on relays, especially relays with their
23045 DirPort open. If your relay has been crashing, or you turned it off
23046 because it used too many resources, give this release a try.
23048 This release also fixes yet another instance of broken OpenSSL libraries
23049 that was causing some relays to drop out of the consensus.
23052 - Teach relays to defend themselves from connection overload. Relays
23053 now close idle circuits early if it looks like they were intended
23054 for directory fetches. Relays are also more aggressive about closing
23055 TLS connections that have no circuits on them. Such circuits are
23056 unlikely to be re-used, and tens of thousands of them were piling
23057 up at the fast relays, causing the relays to run out of sockets
23058 and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
23059 their directory fetches over TLS).
23060 - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
23061 that claim to be earlier than 0.9.8m, but which have in reality
23062 backported huge swaths of 0.9.8m or 0.9.8n renegotiation
23063 behavior. Possible fix for some cases of bug 1346.
23064 - Directory mirrors were fetching relay descriptors only from v2
23065 directory authorities, rather than v3 authorities like they should.
23066 Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
23067 to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
23070 - Finally get rid of the deprecated and now harmful notion of "clique
23071 mode", where directory authorities maintain TLS connections to
23075 - In the util/threads test, no longer free the test_mutex before all
23076 worker threads have finished. Bugfix on 0.2.1.6-alpha.
23077 - The master thread could starve the worker threads quite badly on
23078 certain systems, causing them to run only partially in the allowed
23079 window. This resulted in test failures. Now the master thread sleeps
23080 occasionally for a few microseconds while the two worker-threads
23081 compete for the mutex. Bugfix on 0.2.0.1-alpha.
23084 Changes in version 0.2.1.25 - 2010-03-16
23085 Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
23086 prevent relays from guessing their IP address correctly. It also fixes
23087 several minor potential security bugs.
23090 - Fix a regression from our patch for bug 1244 that caused relays
23091 to guess their IP address incorrectly if they didn't set Address
23092 in their torrc and/or their address fails to resolve. Bugfix on
23093 0.2.1.23; fixes bug 1269.
23094 - When freeing a session key, zero it out completely. We only zeroed
23095 the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
23096 patched by ekir. Fixes bug 1254.
23099 - Fix a dereference-then-NULL-check sequence when publishing
23100 descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
23102 - Fix another dereference-then-NULL-check sequence. Bugfix on
23103 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
23104 - Make sure we treat potentially not NUL-terminated strings correctly.
23105 Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
23108 Changes in version 0.2.1.24 - 2010-02-21
23109 Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
23113 - Work correctly out-of-the-box with even more vendor-patched versions
23114 of OpenSSL. In particular, make it so Debian and OS X don't need
23115 customized patches to run/build.
23118 Changes in version 0.2.1.23 - 2010-02-13
23119 Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
23120 again on the latest OS X, and updates the location of a directory
23123 o Major bugfixes (performance):
23124 - We were selecting our guards uniformly at random, and then weighting
23125 which of our guards we'd use uniformly at random. This imbalance
23126 meant that Tor clients were severely limited on throughput (and
23127 probably latency too) by the first hop in their circuit. Now we
23128 select guards weighted by currently advertised bandwidth. We also
23129 automatically discard guards picked using the old algorithm. Fixes
23130 bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
23133 - Make Tor work again on the latest OS X: when deciding whether to
23134 use strange flags to turn TLS renegotiation on, detect the OpenSSL
23135 version at run-time, not compile time. We need to do this because
23136 Apple doesn't update its dev-tools headers when it updates its
23137 libraries in a security patch.
23138 - Fix a potential buffer overflow in lookup_last_hid_serv_request()
23139 that could happen on 32-bit platforms with 64-bit time_t. Also fix
23140 a memory leak when requesting a hidden service descriptor we've
23141 requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
23145 - Refactor resolve_my_address() to not use gethostbyname() anymore.
23146 Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
23149 - Avoid a mad rush at the beginning of each month when each client
23150 rotates half of its guards. Instead we spread the rotation out
23151 throughout the month, but we still avoid leaving a precise timestamp
23152 in the state file about when we first picked the guard. Improves
23153 over the behavior introduced in 0.1.2.17.
23156 Changes in version 0.2.1.22 - 2010-01-19
23157 Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
23158 authorities -- it would tell you its whole history of bridge descriptors
23159 if you make the right directory request. This stable update also
23160 rotates two of the seven v3 directory authority keys and locations.
23162 o Directory authority changes:
23163 - Rotate keys (both v3 identity and relay identity) for moria1
23167 - Stop bridge directory authorities from answering dbg-stability.txt
23168 directory queries, which would let people fetch a list of all
23169 bridge identities they track. Bugfix on 0.2.1.6-alpha.
23172 Changes in version 0.2.1.21 - 2009-12-21
23173 Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
23174 library. If you use Tor on Linux / Unix and you're getting SSL
23175 renegotiation errors, upgrading should help. We also recommend an
23176 upgrade if you're an exit relay.
23179 - Work around a security feature in OpenSSL 0.9.8l that prevents our
23180 handshake from working unless we explicitly tell OpenSSL that we
23181 are using SSL renegotiation safely. We are, of course, but OpenSSL
23182 0.9.8l won't work unless we say we are.
23183 - Avoid crashing if the client is trying to upload many bytes and the
23184 circuit gets torn down at the same time, or if the flip side
23185 happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
23188 - Do not refuse to learn about authority certs and v2 networkstatus
23189 documents that are older than the latest consensus. This bug might
23190 have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
23191 Spotted and fixed by xmux.
23192 - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
23193 trigger platform-specific option misparsing case found by Coverity
23195 - Fix a compilation warning on Fedora 12 by removing an impossible-to-
23196 trigger assert. Fixes bug 1173.
23199 Changes in version 0.2.1.20 - 2009-10-15
23200 Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
23201 services at once, prepares for more performance improvements, and
23202 fixes a bunch of smaller bugs.
23204 The Windows and OS X bundles also include a more recent Vidalia,
23205 and switch from Privoxy to Polipo.
23207 The OS X installers are now drag and drop. It's best to un-install
23208 Tor/Vidalia and then install this new bundle, rather than upgrade. If
23209 you want to upgrade, you'll need to update the paths for Tor and Polipo
23210 in the Vidalia Settings window.
23213 - Send circuit or stream sendme cells when our window has decreased
23214 by 100 cells, not when it has decreased by 101 cells. Bug uncovered
23215 by Karsten when testing the "reduce circuit window" performance
23216 patch. Bugfix on the 54th commit on Tor -- from July 2002,
23217 before the release of Tor 0.0.0. This is the new winner of the
23219 - Fix a remotely triggerable memory leak when a consensus document
23220 contains more than one signature from the same voter. Bugfix on
23222 - Avoid segfault in rare cases when finishing an introduction circuit
23223 as a client and finding out that we don't have an introduction key
23224 for it. Fixes bug 1073. Reported by Aaron Swartz.
23227 - Tor now reads the "circwindow" parameter out of the consensus,
23228 and uses that value for its circuit package window rather than the
23229 default of 1000 cells. Begins the implementation of proposal 168.
23231 o New directory authorities:
23232 - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
23234 - Move moria1 and tonga to alternate IP addresses.
23237 - Fix a signed/unsigned compile warning in 0.2.1.19.
23238 - Fix possible segmentation fault on directory authorities. Bugfix on
23240 - Fix an extremely rare infinite recursion bug that could occur if
23241 we tried to log a message after shutting down the log subsystem.
23242 Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
23243 - Fix an obscure bug where hidden services on 64-bit big-endian
23244 systems might mis-read the timestamp in v3 introduce cells, and
23245 refuse to connect back to the client. Discovered by "rotor".
23246 Bugfix on 0.2.1.6-alpha.
23247 - We were triggering a CLOCK_SKEW controller status event whenever
23248 we connect via the v2 connection protocol to any relay that has
23249 a wrong clock. Instead, we should only inform the controller when
23250 it's a trusted authority that claims our clock is wrong. Bugfix
23251 on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
23252 - We were telling the controller about CHECKING_REACHABILITY and
23253 REACHABILITY_FAILED status events whenever we launch a testing
23254 circuit or notice that one has failed. Instead, only tell the
23255 controller when we want to inform the user of overall success or
23256 overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
23258 - Don't warn when we're using a circuit that ends with a node
23259 excluded in ExcludeExitNodes, but the circuit is not used to access
23260 the outside world. This should help fix bug 1090. Bugfix on
23262 - Work around a small memory leak in some versions of OpenSSL that
23263 stopped the memory used by the hostname TLS extension from being
23267 - Add a "getinfo status/accepted-server-descriptor" controller
23268 command, which is the recommended way for controllers to learn
23269 whether our server descriptor has been successfully received by at
23270 least on directory authority. Un-recommend good-server-descriptor
23271 getinfo and status events until we have a better design for them.
23274 Changes in version 0.2.1.19 - 2009-07-28
23275 Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
23279 - Make accessing hidden services on 0.2.1.x work right again.
23280 Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
23281 part of patch provided by "optimist".
23284 - When a relay/bridge is writing out its identity key fingerprint to
23285 the "fingerprint" file and to its logs, write it without spaces. Now
23286 it will look like the fingerprints in our bridges documentation,
23287 and confuse fewer users.
23290 - Relays no longer publish a new server descriptor if they change
23291 their MaxAdvertisedBandwidth config option but it doesn't end up
23292 changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
23293 fixes bug 1026. Patch from Sebastian.
23294 - Avoid leaking memory every time we get a create cell but we have
23295 so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
23296 fixes bug 1034. Reported by BarkerJr.
23299 Changes in version 0.2.1.18 - 2009-07-24
23300 Tor 0.2.1.18 lays the foundations for performance improvements,
23301 adds status events to help users diagnose bootstrap problems, adds
23302 optional authentication/authorization for hidden services, fixes a
23303 variety of potential anonymity problems, and includes a huge pile of
23304 other features and bug fixes.
23306 o Major features (clients):
23307 - Start sending "bootstrap phase" status events to the controller,
23308 so it can keep the user informed of progress fetching directory
23309 information and establishing circuits. Also inform the controller
23310 if we think we're stuck at a particular bootstrap phase. Implements
23312 - Clients replace entry guards that were chosen more than a few months
23313 ago. This change should significantly improve client performance,
23314 especially once more people upgrade, since relays that have been
23315 a guard for a long time are currently overloaded.
23316 - Network status consensus documents and votes now contain bandwidth
23317 information for each relay. Clients use the bandwidth values
23318 in the consensus, rather than the bandwidth values in each
23319 relay descriptor. This approach opens the door to more accurate
23320 bandwidth estimates once the directory authorities start doing
23321 active measurements. Implements part of proposal 141.
23323 o Major features (relays):
23324 - Disable and refactor some debugging checks that forced a linear scan
23325 over the whole server-side DNS cache. These accounted for over 50%
23326 of CPU time on a relatively busy exit node's gprof profile. Also,
23327 disable some debugging checks that appeared in exit node profile
23328 data. Found by Jacob.
23329 - New DirPortFrontPage option that takes an html file and publishes
23330 it as "/" on the DirPort. Now relay operators can provide a
23331 disclaimer without needing to set up a separate webserver. There's
23332 a sample disclaimer in contrib/tor-exit-notice.html.
23334 o Major features (hidden services):
23335 - Make it possible to build hidden services that only certain clients
23336 are allowed to connect to. This is enforced at several points,
23337 so that unauthorized clients are unable to send INTRODUCE cells
23338 to the service, or even (depending on the type of authentication)
23339 to learn introduction points. This feature raises the bar for
23340 certain kinds of active attacks against hidden services. Design
23341 and code by Karsten Loesing. Implements proposal 121.
23342 - Relays now store and serve v2 hidden service descriptors by default,
23343 i.e., the new default value for HidServDirectoryV2 is 1. This is
23344 the last step in proposal 114, which aims to make hidden service
23345 lookups more reliable.
23347 o Major features (path selection):
23348 - ExitNodes and Exclude*Nodes config options now allow you to restrict
23349 by country code ("{US}") or IP address or address pattern
23350 ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
23351 refinement to decide what config options should take priority if
23352 you ask to both use a particular node and exclude it.
23354 o Major features (misc):
23355 - When building a consensus, do not include routers that are down.
23356 This cuts down 30% to 40% on consensus size. Implements proposal
23358 - New TestingTorNetwork config option to allow adjustment of
23359 previously constant values that could slow bootstrapping. Implements
23360 proposal 135. Patch from Karsten.
23361 - Convert many internal address representations to optionally hold
23362 IPv6 addresses. Generate and accept IPv6 addresses in many protocol
23363 elements. Make resolver code handle nameservers located at IPv6
23365 - More work on making our TLS handshake blend in: modify the list
23366 of ciphers advertised by OpenSSL in client mode to even more
23367 closely resemble a common web browser. We cheat a little so that
23368 we can advertise ciphers that the locally installed OpenSSL doesn't
23370 - Use the TLS1 hostname extension to more closely resemble browser
23373 o Security fixes (anonymity/entropy):
23374 - Never use a connection with a mismatched address to extend a
23375 circuit, unless that connection is canonical. A canonical
23376 connection is one whose address is authenticated by the router's
23377 identity key, either in a NETINFO cell or in a router descriptor.
23378 - Implement most of proposal 110: The first K cells to be sent
23379 along a circuit are marked as special "early" cells; only K "early"
23380 cells will be allowed. Once this code is universal, we can block
23381 certain kinds of denial-of-service attack by requiring that EXTEND
23382 commands must be sent using an "early" cell.
23383 - Resume using OpenSSL's RAND_poll() for better (and more portable)
23384 cross-platform entropy collection again. We used to use it, then
23385 stopped using it because of a bug that could crash systems that
23386 called RAND_poll when they had a lot of fds open. It looks like the
23387 bug got fixed in late 2006. Our new behavior is to call RAND_poll()
23388 at startup, and to call RAND_poll() when we reseed later only if
23389 we have a non-buggy OpenSSL version.
23390 - When the client is choosing entry guards, now it selects at most
23391 one guard from a given relay family. Otherwise we could end up with
23392 all of our entry points into the network run by the same operator.
23393 Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
23394 - Do not use or believe expired v3 authority certificates. Patch
23395 from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
23396 - Drop begin cells to a hidden service if they come from the middle
23397 of a circuit. Patch from lark.
23398 - When we erroneously receive two EXTEND cells for the same circuit
23399 ID on the same connection, drop the second. Patch from lark.
23400 - Authorities now vote for the Stable flag for any router whose
23401 weighted MTBF is at least 5 days, regardless of the mean MTBF.
23402 - Clients now never report any stream end reason except 'MISC'.
23403 Implements proposal 148.
23405 o Major bugfixes (crashes):
23406 - Parse dates and IPv4 addresses in a locale- and libc-independent
23407 manner, to avoid platform-dependent behavior on malformed input.
23408 - Fix a crash that occurs on exit nodes when a nameserver request
23409 timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
23410 been suppressing the bug since 0.1.2.10-alpha. Partial fix for
23412 - Do not assume that a stack-allocated character array will be
23413 64-bit aligned on platforms that demand that uint64_t access is
23414 aligned. Possible fix for bug 604.
23415 - Resolve a very rare crash bug that could occur when the user forced
23416 a nameserver reconfiguration during the middle of a nameserver
23417 probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
23418 - Avoid a "0 divided by 0" calculation when calculating router uptime
23419 at directory authorities. Bugfix on 0.2.0.8-alpha.
23420 - Fix an assertion bug in parsing policy-related options; possible fix
23422 - Rate-limit too-many-sockets messages: when they happen, they happen
23423 a lot and end up filling up the disk. Resolves bug 748.
23424 - Fix a race condition that could cause crashes or memory corruption
23425 when running as a server with a controller listening for log
23427 - Avoid crashing when we have a policy specified in a DirPolicy or
23428 SocksPolicy or ReachableAddresses option with ports set on it,
23429 and we re-load the policy. May fix bug 996.
23430 - Fix an assertion failure on 64-bit platforms when we allocated
23431 memory right up to the end of a memarea, then realigned the memory
23432 one step beyond the end. Fixes a possible cause of bug 930.
23433 - Protect the count of open sockets with a mutex, so we can't
23434 corrupt it when two threads are closing or opening sockets at once.
23435 Fix for bug 939. Bugfix on 0.2.0.1-alpha.
23437 o Major bugfixes (clients):
23438 - Discard router descriptors as we load them if they are more than
23439 five days old. Otherwise if Tor is off for a long time and then
23440 starts with cached descriptors, it will try to use the onion keys
23441 in those obsolete descriptors when building circuits. Fixes bug 887.
23442 - When we choose to abandon a new entry guard because we think our
23443 older ones might be better, close any circuits pending on that
23444 new entry guard connection. This fix should make us recover much
23445 faster when our network is down and then comes back. Bugfix on
23446 0.1.2.8-beta; found by lodger.
23447 - When Tor clients restart after 1-5 days, they discard all their
23448 cached descriptors as too old, but they still use the cached
23449 consensus document. This approach is good for robustness, but
23450 bad for performance: since they don't know any bandwidths, they
23451 end up choosing at random rather than weighting their choice by
23452 speed. Fixed by the above feature of putting bandwidths in the
23455 o Major bugfixes (relays):
23456 - Relays were falling out of the networkstatus consensus for
23457 part of a day if they changed their local config but the
23458 authorities discarded their new descriptor as "not sufficiently
23459 different". Now directory authorities accept a descriptor as changed
23460 if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
23461 patch by Sebastian.
23462 - Ensure that two circuits can never exist on the same connection
23463 with the same circuit ID, even if one is marked for close. This
23464 is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
23465 - Directory authorities were neglecting to mark relays down in their
23466 internal histories if the relays fall off the routerlist without
23467 ever being found unreachable. So there were relays in the histories
23468 that haven't been seen for eight months, and are listed as being
23469 up for eight months. This wreaked havoc on the "median wfu" and
23470 "median mtbf" calculations, in turn making Guard and Stable flags
23471 wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
23474 o Major bugfixes (hidden services):
23475 - When establishing a hidden service, introduction points that
23476 originate from cannibalized circuits were completely ignored
23477 and not included in rendezvous service descriptors. This might
23478 have been another reason for delay in making a hidden service
23479 available. Bugfix from long ago (0.0.9.x?)
23481 o Major bugfixes (memory and resource management):
23482 - Fixed some memory leaks -- some quite frequent, some almost
23483 impossible to trigger -- based on results from Coverity.
23484 - Speed up parsing and cut down on memory fragmentation by using
23485 stack-style allocations for parsing directory objects. Previously,
23486 this accounted for over 40% of allocations from within Tor's code
23487 on a typical directory cache.
23488 - Use a Bloom filter rather than a digest-based set to track which
23489 descriptors we need to keep around when we're cleaning out old
23490 router descriptors. This speeds up the computation significantly,
23491 and may reduce fragmentation.
23493 o New/changed config options:
23494 - Now NodeFamily and MyFamily config options allow spaces in
23495 identity fingerprints, so it's easier to paste them in.
23496 Suggested by Lucky Green.
23497 - Allow ports 465 and 587 in the default exit policy again. We had
23498 rejected them in 0.1.0.15, because back in 2005 they were commonly
23499 misconfigured and ended up as spam targets. We hear they are better
23500 locked down these days.
23501 - Make TrackHostExit mappings expire a while after their last use, not
23502 after their creation. Patch from Robert Hogan.
23503 - Add an ExcludeExitNodes option so users can list a set of nodes
23504 that should be be excluded from the exit node position, but
23505 allowed elsewhere. Implements proposal 151.
23506 - New --hush command-line option similar to --quiet. While --quiet
23507 disables all logging to the console on startup, --hush limits the
23508 output to messages of warning and error severity.
23509 - New configure/torrc options (--enable-geoip-stats,
23510 DirRecordUsageByCountry) to record how many IPs we've served
23511 directory info to in each country code, how many status documents
23512 total we've sent to each country code, and what share of the total
23513 directory requests we should expect to see.
23514 - Make outbound DNS packets respect the OutboundBindAddress setting.
23515 Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
23516 - Allow separate log levels to be configured for different logging
23517 domains. For example, this allows one to log all notices, warnings,
23518 or errors, plus all memory management messages of level debug or
23519 higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
23520 - Update to the "June 3 2009" ip-to-country file.
23522 o Minor features (relays):
23523 - Raise the minimum rate limiting to be a relay from 20000 bytes
23524 to 20480 bytes (aka 20KB/s), to match our documentation. Also
23525 update directory authorities so they always assign the Fast flag
23526 to relays with 20KB/s of capacity. Now people running relays won't
23527 suddenly find themselves not seeing any use, if the network gets
23529 - If we're a relay and we change our IP address, be more verbose
23530 about the reason that made us change. Should help track down
23531 further bugs for relays on dynamic IP addresses.
23532 - Exit servers can now answer resolve requests for ip6.arpa addresses.
23533 - Implement most of Proposal 152: allow specialized servers to permit
23534 single-hop circuits, and clients to use those servers to build
23535 single-hop circuits when using a specialized controller. Patch
23536 from Josh Albrecht. Resolves feature request 768.
23537 - When relays do their initial bandwidth measurement, don't limit
23538 to just our entry guards for the test circuits. Otherwise we tend
23539 to have multiple test circuits going through a single entry guard,
23540 which makes our bandwidth test less accurate. Fixes part of bug 654;
23541 patch contributed by Josh Albrecht.
23543 o Minor features (directory authorities):
23544 - Try not to open more than one descriptor-downloading connection
23545 to an authority at once. This should reduce load on directory
23546 authorities. Fixes bug 366.
23547 - Add cross-certification to newly generated certificates, so that
23548 a signing key is enough information to look up a certificate. Start
23549 serving certificates by <identity digest, signing key digest>
23550 pairs. Implements proposal 157.
23551 - When a directory authority downloads a descriptor that it then
23552 immediately rejects, do not retry downloading it right away. Should
23553 save some bandwidth on authorities. Fix for bug 888. Patch by
23555 - Directory authorities now serve a /tor/dbg-stability.txt URL to
23556 help debug WFU and MTBF calculations.
23557 - In directory authorities' approved-routers files, allow
23558 fingerprints with or without space.
23560 o Minor features (directory mirrors):
23561 - When a download gets us zero good descriptors, do not notify
23562 Tor that new directory information has arrived.
23563 - Servers support a new URL scheme for consensus downloads that
23564 allows the client to specify which authorities are trusted.
23565 The server then only sends the consensus if the client will trust
23566 it. Otherwise a 404 error is sent back. Clients use this
23567 new scheme when the server supports it (meaning it's running
23568 0.2.1.1-alpha or later). Implements proposal 134.
23570 o Minor features (bridges):
23571 - If the bridge config line doesn't specify a port, assume 443.
23572 This makes bridge lines a bit smaller and easier for users to
23574 - If we're using bridges and our network goes away, be more willing
23575 to forgive our bridges and try again when we get an application
23578 o Minor features (hidden services):
23579 - When the client launches an introduction circuit, retry with a
23580 new circuit after 30 seconds rather than 60 seconds.
23581 - Launch a second client-side introduction circuit in parallel
23582 after a delay of 15 seconds (based on work by Christian Wilms).
23583 - Hidden services start out building five intro circuits rather
23584 than three, and when the first three finish they publish a service
23585 descriptor using those. Now we publish our service descriptor much
23586 faster after restart.
23587 - Drop the requirement to have an open dir port for storing and
23588 serving v2 hidden service descriptors.
23590 o Minor features (build and packaging):
23591 - On Linux, use the prctl call to re-enable core dumps when the User
23593 - Try to make sure that the version of Libevent we're running with
23594 is binary-compatible with the one we built with. May address bug
23596 - Add a new --enable-local-appdata configuration switch to change
23597 the default location of the datadir on win32 from APPDATA to
23598 LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
23599 entirely. Patch from coderman.
23600 - Build correctly against versions of OpenSSL 0.9.8 or later that
23601 are built without support for deprecated functions.
23602 - On platforms with a maximum syslog string length, truncate syslog
23603 messages to that length ourselves, rather than relying on the
23604 system to do it for us.
23605 - Automatically detect MacOSX versions earlier than 10.4.0, and
23606 disable kqueue from inside Tor when running with these versions.
23607 We previously did this from the startup script, but that was no
23608 help to people who didn't use the startup script. Resolves bug 863.
23609 - Build correctly when configured to build outside the main source
23610 path. Patch from Michael Gold.
23611 - Disable GCC's strict alias optimization by default, to avoid the
23612 likelihood of its introducing subtle bugs whenever our code violates
23613 the letter of C99's alias rules.
23614 - Change the contrib/tor.logrotate script so it makes the new
23615 logs as "_tor:_tor" rather than the default, which is generally
23616 "root:wheel". Fixes bug 676, reported by Serge Koksharov.
23617 - Change our header file guard macros to be less likely to conflict
23618 with system headers. Adam Langley noticed that we were conflicting
23619 with log.h on Android.
23620 - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
23621 and stop using a warning that had become unfixably verbose under
23623 - Use a lockfile to make sure that two Tor processes are not
23624 simultaneously running with the same datadir.
23625 - Allow OpenSSL to use dynamic locks if it wants.
23626 - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
23628 o Minor features (controllers):
23629 - When generating circuit events with verbose nicknames for
23630 controllers, try harder to look up nicknames for routers on a
23631 circuit. (Previously, we would look in the router descriptors we had
23632 for nicknames, but not in the consensus.) Partial fix for bug 941.
23633 - New controller event NEWCONSENSUS that lists the networkstatus
23634 lines for every recommended relay. Now controllers like Torflow
23635 can keep up-to-date on which relays they should be using.
23636 - New controller event "clients_seen" to report a geoip-based summary
23637 of which countries we've seen clients from recently. Now controllers
23638 like Vidalia can show bridge operators that they're actually making
23640 - Add a 'getinfo status/clients-seen' controller command, in case
23641 controllers want to hear clients_seen events but connect late.
23642 - New CONSENSUS_ARRIVED event to note when a new consensus has
23643 been fetched and validated.
23644 - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
23645 controllers to prevent SIGHUP from reloading the configuration.
23647 - Return circuit purposes in response to GETINFO circuit-status.
23649 - Serve the latest v3 networkstatus consensus via the control
23650 port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
23651 - Add a "GETINFO /status/bootstrap-phase" controller option, so the
23652 controller can query our current bootstrap state in case it attaches
23653 partway through and wants to catch up.
23654 - Provide circuit purposes along with circuit events to the controller.
23656 o Minor features (tools):
23657 - Do not have tor-resolve automatically refuse all .onion addresses;
23658 if AutomapHostsOnResolve is set in your torrc, this will work fine.
23659 - Add a -p option to tor-resolve for specifying the SOCKS port: some
23660 people find host:port too confusing.
23661 - Print the SOCKS5 error message string as well as the error code
23662 when a tor-resolve request fails. Patch from Jacob.
23664 o Minor bugfixes (memory and resource management):
23665 - Clients no longer cache certificates for authorities they do not
23666 recognize. Bugfix on 0.2.0.9-alpha.
23667 - Do not use C's stdio library for writing to log files. This will
23668 improve logging performance by a minute amount, and will stop
23669 leaking fds when our disk is full. Fixes bug 861.
23670 - Stop erroneous use of O_APPEND in cases where we did not in fact
23671 want to re-seek to the end of a file before every last write().
23672 - Fix a small alignment and memory-wasting bug on buffer chunks.
23674 - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
23675 to avoid unused RAM in buffer chunks and memory pools.
23676 - Reduce the default smartlist size from 32 to 16; it turns out that
23677 most smartlists hold around 8-12 elements tops.
23678 - Make dumpstats() log the fullness and size of openssl-internal
23680 - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
23681 patch to their OpenSSL, turn it on to save memory on servers. This
23682 patch will (with any luck) get included in a mainline distribution
23684 - Fix a memory leak when v3 directory authorities load their keys
23685 and cert from disk. Bugfix on 0.2.0.1-alpha.
23686 - Stop using malloc_usable_size() to use more area than we had
23687 actually allocated: it was safe, but made valgrind really unhappy.
23688 - Make the assert_circuit_ok() function work correctly on circuits that
23689 have already been marked for close.
23690 - Fix uninitialized size field for memory area allocation: may improve
23691 memory performance during directory parsing.
23693 o Minor bugfixes (clients):
23694 - Stop reloading the router list from disk for no reason when we
23695 run out of reachable directory mirrors. Once upon a time reloading
23696 it would set the 'is_running' flag back to 1 for them. It hasn't
23697 done that for a long time.
23698 - When we had picked an exit node for a connection, but marked it as
23699 "optional", and it turned out we had no onion key for the exit,
23700 stop wanting that exit and try again. This situation may not
23701 be possible now, but will probably become feasible with proposal
23702 158. Spotted by rovv. Fixes another case of bug 752.
23703 - Fix a bug in address parsing that was preventing bridges or hidden
23704 service targets from being at IPv6 addresses.
23705 - Do not remove routers as too old if we do not have any consensus
23706 document. Bugfix on 0.2.0.7-alpha.
23707 - When an exit relay resolves a stream address to a local IP address,
23708 do not just keep retrying that same exit relay over and
23709 over. Instead, just close the stream. Addresses bug 872. Bugfix
23710 on 0.2.0.32. Patch from rovv.
23711 - Made Tor a little less aggressive about deleting expired
23712 certificates. Partial fix for bug 854.
23713 - Treat duplicate certificate fetches as failures, so that we do
23714 not try to re-fetch an expired certificate over and over and over.
23715 - Do not say we're fetching a certificate when we'll in fact skip it
23716 because of a pending download.
23717 - If we have correct permissions on $datadir, we complain to stdout
23718 and fail to start. But dangerous permissions on
23719 $datadir/cached-status/ would cause us to open a log and complain
23720 there. Now complain to stdout and fail to start in both cases. Fixes
23721 bug 820, reported by seeess.
23723 o Minor bugfixes (bridges):
23724 - When we made bridge authorities stop serving bridge descriptors over
23725 unencrypted links, we also broke DirPort reachability testing for
23726 bridges. So bridges with a non-zero DirPort were printing spurious
23727 warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
23728 - Don't allow a bridge to publish its router descriptor to a
23729 non-bridge directory authority. Fixes part of bug 932.
23730 - When we change to or from being a bridge, reset our counts of
23731 client usage by country. Fixes bug 932.
23733 o Minor bugfixes (relays):
23734 - Log correct error messages for DNS-related network errors on
23736 - Actually return -1 in the error case for read_bandwidth_usage().
23737 Harmless bug, since we currently don't care about the return value
23738 anywhere. Bugfix on 0.2.0.9-alpha.
23739 - Provide a more useful log message if bug 977 (related to buffer
23740 freelists) ever reappears, and do not crash right away.
23741 - We were already rejecting relay begin cells with destination port
23742 of 0. Now also reject extend cells with destination port or address
23743 of 0. Suggested by lark.
23744 - When we can't transmit a DNS request due to a network error, retry
23745 it after a while, and eventually transmit a failing response to
23746 the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
23747 - Solve a bug that kept hardware crypto acceleration from getting
23748 enabled when accounting was turned on. Fixes bug 907. Bugfix on
23750 - When a canonical connection appears later in our internal list
23751 than a noncanonical one for a given OR ID, always use the
23752 canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
23754 - Avoid some nasty corner cases in the logic for marking connections
23755 as too old or obsolete or noncanonical for circuits. Partial
23757 - Fix another interesting corner-case of bug 891 spotted by rovv:
23758 Previously, if two hosts had different amounts of clock drift, and
23759 one of them created a new connection with just the wrong timing,
23760 the other might decide to deprecate the new connection erroneously.
23761 Bugfix on 0.1.1.13-alpha.
23762 - If one win32 nameserver fails to get added, continue adding the
23763 rest, and don't automatically fail.
23764 - Fix a bug where an unreachable relay would establish enough
23765 reachability testing circuits to do a bandwidth test -- if
23766 we already have a connection to the middle hop of the testing
23767 circuit, then it could establish the last hop by using the existing
23768 connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
23769 circuits no longer use entry guards in 0.2.1.3-alpha.
23771 o Minor bugfixes (directory authorities):
23772 - Limit uploaded directory documents to be 16M rather than 500K.
23773 The directory authorities were refusing v3 consensus votes from
23774 other authorities, since the votes are now 504K. Fixes bug 959;
23775 bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
23776 - Directory authorities should never send a 503 "busy" response to
23777 requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
23779 - Fix code so authorities _actually_ send back X-Descriptor-Not-New
23780 headers. Bugfix on 0.2.0.10-alpha.
23782 o Minor bugfixes (hidden services):
23783 - When we can't find an intro key for a v2 hidden service descriptor,
23784 fall back to the v0 hidden service descriptor and log a bug message.
23785 Workaround for bug 1024.
23786 - In very rare situations new hidden service descriptors were
23787 published earlier than 30 seconds after the last change to the
23788 service. (We currently think that a hidden service descriptor
23789 that's been stable for 30 seconds is worth publishing.)
23790 - If a hidden service sends us an END cell, do not consider
23791 retrying the connection; just close it. Patch from rovv.
23792 - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
23793 service directories if they have no advertised dir port. Bugfix
23796 o Minor bugfixes (tools):
23797 - In the torify(1) manpage, mention that tsocks will leak your
23800 o Minor bugfixes (controllers):
23801 - If the controller claimed responsibility for a stream, but that
23802 stream never finished making its connection, it would live
23803 forever in circuit_wait state. Now we close it after SocksTimeout
23804 seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
23805 - Make DNS resolved controller events into "CLOSED", not
23806 "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
23808 - The control port would close the connection before flushing long
23809 replies, such as the network consensus, if a QUIT command was issued
23810 before the reply had completed. Now, the control port flushes all
23811 pending replies before closing the connection. Also fix a spurious
23812 warning when a QUIT command is issued after a malformed or rejected
23813 AUTHENTICATE command, but before the connection was closed. Patch
23814 by Marcus Griep. Fixes bugs 1015 and 1016.
23815 - Fix a bug that made stream bandwidth get misreported to the
23818 o Deprecated and removed features:
23819 - The old "tor --version --version" command, which would print out
23820 the subversion "Id" of most of the source files, is now removed. It
23821 turned out to be less useful than we'd expected, and harder to
23823 - RedirectExits has been removed. It was deprecated since
23825 - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
23826 has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
23827 - Cell pools are now always enabled; --disable-cell-pools is ignored.
23828 - Directory mirrors no longer fetch the v1 directory or
23829 running-routers files. They are obsolete, and nobody asks for them
23830 anymore. This is the first step to making v1 authorities obsolete.
23831 - Take out the TestVia config option, since it was a workaround for
23832 a bug that was fixed in Tor 0.1.1.21.
23833 - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
23834 HiddenServiceExcludeNodes as obsolete: they never worked properly,
23835 and nobody seems to be using them. Fixes bug 754. Bugfix on
23836 0.1.0.1-rc. Patch from Christian Wilms.
23837 - Remove all backward-compatibility code for relays running
23838 versions of Tor so old that they no longer work at all on the
23841 o Code simplifications and refactoring:
23842 - Tool-assisted documentation cleanup. Nearly every function or
23843 static variable in Tor should have its own documentation now.
23844 - Rename the confusing or_is_obsolete field to the more appropriate
23845 is_bad_for_new_circs, and move it to or_connection_t where it
23847 - Move edge-only flags from connection_t to edge_connection_t: not
23848 only is this better coding, but on machines of plausible alignment,
23849 it should save 4-8 bytes per connection_t. "Every little bit helps."
23850 - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
23851 for consistency; keep old option working for backward compatibility.
23852 - Simplify the code for finding connections to use for a circuit.
23853 - Revise the connection_new functions so that a more typesafe variant
23854 exists. This will work better with Coverity, and let us find any
23855 actual mistakes we're making here.
23856 - Refactor unit testing logic so that dmalloc can be used sensibly
23857 with unit tests to check for memory leaks.
23858 - Move all hidden-service related fields from connection and circuit
23859 structure to substructures: this way they won't eat so much memory.
23860 - Squeeze 2-5% out of client performance (according to oprofile) by
23861 improving the implementation of some policy-manipulation functions.
23862 - Change the implementation of ExcludeNodes and ExcludeExitNodes to
23863 be more efficient. Formerly it was quadratic in the number of
23864 servers; now it should be linear. Fixes bug 509.
23865 - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
23866 and n_conn_id_digest fields into a separate structure that's
23867 only needed when the circuit has not yet attached to an n_conn.
23868 - Optimize out calls to time(NULL) that occur for every IO operation,
23869 or for every cell. On systems like Windows where time() is a
23870 slow syscall, this fix will be slightly helpful.
23873 Changes in version 0.2.0.35 - 2009-06-24
23875 - Avoid crashing in the presence of certain malformed descriptors.
23876 Found by lark, and by automated fuzzing.
23877 - Fix an edge case where a malicious exit relay could convince a
23878 controller that the client's DNS question resolves to an internal IP
23879 address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
23882 - Finally fix the bug where dynamic-IP relays disappear when their
23883 IP address changes: directory mirrors were mistakenly telling
23884 them their old address if they asked via begin_dir, so they
23885 never got an accurate answer about their new address, so they
23886 just vanished after a day. For belt-and-suspenders, relays that
23887 don't set Address in their config now avoid using begin_dir for
23888 all direct connections. Should fix bugs 827, 883, and 900.
23889 - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
23890 that would occur on some exit nodes when DNS failures and timeouts
23891 occurred in certain patterns. Fix for bug 957.
23894 - When starting with a cache over a few days old, do not leak
23895 memory for the obsolete router descriptors in it. Bugfix on
23896 0.2.0.33; fixes bug 672.
23897 - Hidden service clients didn't use a cached service descriptor that
23898 was older than 15 minutes, but wouldn't fetch a new one either,
23899 because there was already one in the cache. Now, fetch a v2
23900 descriptor unless the same descriptor was added to the cache within
23901 the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
23904 Changes in version 0.2.0.34 - 2009-02-08
23905 Tor 0.2.0.34 features several more security-related fixes. You should
23906 upgrade, especially if you run an exit relay (remote crash) or a
23907 directory authority (remote infinite loop), or you're on an older
23908 (pre-XP) or not-recently-patched Windows (remote exploit).
23910 This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
23911 have many known flaws, and nobody should be using them. You should
23912 upgrade. If you're using a Linux or BSD and its packages are obsolete,
23913 stop using those packages and upgrade anyway.
23916 - Fix an infinite-loop bug on handling corrupt votes under certain
23917 circumstances. Bugfix on 0.2.0.8-alpha.
23918 - Fix a temporary DoS vulnerability that could be performed by
23919 a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
23920 - Avoid a potential crash on exit nodes when processing malformed
23921 input. Remote DoS opportunity. Bugfix on 0.2.0.33.
23922 - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
23923 Spec conformance issue. Bugfix on Tor 0.0.2pre27.
23926 - Fix compilation on systems where time_t is a 64-bit integer.
23927 Patch from Matthias Drochner.
23928 - Don't consider expiring already-closed client connections. Fixes
23929 bug 893. Bugfix on 0.0.2pre20.
23932 Changes in version 0.2.0.33 - 2009-01-21
23933 Tor 0.2.0.33 fixes a variety of bugs that were making relays less
23934 useful to users. It also finally fixes a bug where a relay or client
23935 that's been off for many days would take a long time to bootstrap.
23937 This update also fixes an important security-related bug reported by
23938 Ilja van Sprundel. You should upgrade. (We'll send out more details
23939 about the bug once people have had some time to upgrade.)
23942 - Fix a heap-corruption bug that may be remotely triggerable on
23943 some platforms. Reported by Ilja van Sprundel.
23946 - When a stream at an exit relay is in state "resolving" or
23947 "connecting" and it receives an "end" relay cell, the exit relay
23948 would silently ignore the end cell and not close the stream. If
23949 the client never closes the circuit, then the exit relay never
23950 closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
23951 reported by "wood".
23952 - When sending CREATED cells back for a given circuit, use a 64-bit
23953 connection ID to find the right connection, rather than an addr:port
23954 combination. Now that we can have multiple OR connections between
23955 the same ORs, it is no longer possible to use addr:port to uniquely
23956 identify a connection.
23957 - Bridge relays that had DirPort set to 0 would stop fetching
23958 descriptors shortly after startup, and then briefly resume
23959 after a new bandwidth test and/or after publishing a new bridge
23960 descriptor. Bridge users that try to bootstrap from them would
23961 get a recent networkstatus but would get descriptors from up to
23962 18 hours earlier, meaning most of the descriptors were obsolete
23963 already. Reported by Tas; bugfix on 0.2.0.13-alpha.
23964 - Prevent bridge relays from serving their 'extrainfo' document
23965 to anybody who asks, now that extrainfo docs include potentially
23966 sensitive aggregated client geoip summaries. Bugfix on
23968 - If the cached networkstatus consensus is more than five days old,
23969 discard it rather than trying to use it. In theory it could be
23970 useful because it lists alternate directory mirrors, but in practice
23971 it just means we spend many minutes trying directory mirrors that
23972 are long gone from the network. Also discard router descriptors as
23973 we load them if they are more than five days old, since the onion
23974 key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
23977 - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
23978 could make gcc generate non-functional binary search code. Bugfix
23980 - Build correctly on platforms without socklen_t.
23981 - Compile without warnings on solaris.
23982 - Avoid potential crash on internal error during signature collection.
23983 Fixes bug 864. Patch from rovv.
23984 - Correct handling of possible malformed authority signing key
23985 certificates with internal signature types. Fixes bug 880.
23986 Bugfix on 0.2.0.3-alpha.
23987 - Fix a hard-to-trigger resource leak when logging credential status.
23989 - When we can't initialize DNS because the network is down, do not
23990 automatically stop Tor from starting. Instead, we retry failed
23991 dns_init() every 10 minutes, and change the exit policy to reject
23992 *:* until one succeeds. Fixes bug 691.
23993 - Use 64 bits instead of 32 bits for connection identifiers used with
23994 the controller protocol, to greatly reduce risk of identifier reuse.
23995 - When we're choosing an exit node for a circuit, and we have
23996 no pending streams, choose a good general exit rather than one that
23997 supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
23998 - Fix another case of assuming, when a specific exit is requested,
23999 that we know more than the user about what hosts it allows.
24000 Fixes one case of bug 752. Patch from rovv.
24001 - Clip the MaxCircuitDirtiness config option to a minimum of 10
24002 seconds. Warn the user if lower values are given in the
24003 configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
24004 - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
24005 user if lower values are given in the configuration. Bugfix on
24006 0.1.1.17-rc. Patch by Sebastian.
24007 - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
24008 the cache because we already had a v0 descriptor with the same ID.
24009 Bugfix on 0.2.0.18-alpha.
24010 - Fix a race condition when freeing keys shared between main thread
24011 and CPU workers that could result in a memory leak. Bugfix on
24012 0.1.0.1-rc. Fixes bug 889.
24013 - Send a valid END cell back when a client tries to connect to a
24014 nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
24015 840. Patch from rovv.
24016 - Check which hops rendezvous stream cells are associated with to
24017 prevent possible guess-the-streamid injection attacks from
24018 intermediate hops. Fixes another case of bug 446. Based on patch
24020 - If a broken client asks a non-exit router to connect somewhere,
24021 do not even do the DNS lookup before rejecting the connection.
24022 Fixes another case of bug 619. Patch from rovv.
24023 - When a relay gets a create cell it can't decrypt (e.g. because it's
24024 using the wrong onion key), we were dropping it and letting the
24025 client time out. Now actually answer with a destroy cell. Fixes
24026 bug 904. Bugfix on 0.0.2pre8.
24028 o Minor bugfixes (hidden services):
24029 - Do not throw away existing introduction points on SIGHUP. Bugfix on
24030 0.0.6pre1. Patch by Karsten. Fixes bug 874.
24033 - Report the case where all signatures in a detached set are rejected
24034 differently than the case where there is an error handling the
24036 - When we realize that another process has modified our cached
24037 descriptors, print out a more useful error message rather than
24038 triggering an assertion. Fixes bug 885. Patch from Karsten.
24039 - Implement the 0x20 hack to better resist DNS poisoning: set the
24040 case on outgoing DNS requests randomly, and reject responses that do
24041 not match the case correctly. This logic can be disabled with the
24042 ServerDNSRandomizeCase setting, if you are using one of the 0.3%
24043 of servers that do not reliably preserve case in replies. See
24044 "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
24046 - Check DNS replies for more matching fields to better resist DNS
24048 - Never use OpenSSL compression: it wastes RAM and CPU trying to
24049 compress cells, which are basically all encrypted, compressed, or
24053 Changes in version 0.2.0.32 - 2008-11-20
24054 Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
24055 packages (and maybe other packages) noticed by Theo de Raadt, fixes
24056 a smaller security flaw that might allow an attacker to access local
24057 services, further improves hidden service performance, and fixes a
24058 variety of other issues.
24061 - The "User" and "Group" config options did not clear the
24062 supplementary group entries for the Tor process. The "User" option
24063 is now more robust, and we now set the groups to the specified
24064 user's primary group. The "Group" option is now ignored. For more
24065 detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
24066 in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
24067 and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
24068 - The "ClientDNSRejectInternalAddresses" config option wasn't being
24069 consistently obeyed: if an exit relay refuses a stream because its
24070 exit policy doesn't allow it, we would remember what IP address
24071 the relay said the destination address resolves to, even if it's
24072 an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
24075 - Fix a DOS opportunity during the voting signature collection process
24076 at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
24078 o Major bugfixes (hidden services):
24079 - When fetching v0 and v2 rendezvous service descriptors in parallel,
24080 we were failing the whole hidden service request when the v0
24081 descriptor fetch fails, even if the v2 fetch is still pending and
24082 might succeed. Similarly, if the last v2 fetch fails, we were
24083 failing the whole hidden service request even if a v0 fetch is
24084 still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
24085 - When extending a circuit to a hidden service directory to upload a
24086 rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
24087 requests failed, because the router descriptor has not been
24088 downloaded yet. In these cases, do not attempt to upload the
24089 rendezvous descriptor, but wait until the router descriptor is
24090 downloaded and retry. Likewise, do not attempt to fetch a rendezvous
24091 descriptor from a hidden service directory for which the router
24092 descriptor has not yet been downloaded. Fixes bug 767. Bugfix
24096 - Fix several infrequent memory leaks spotted by Coverity.
24097 - When testing for libevent functions, set the LDFLAGS variable
24098 correctly. Found by Riastradh.
24099 - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
24100 bootstrapping with tunneled directory connections. Bugfix on
24101 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
24102 - When asked to connect to A.B.exit:80, if we don't know the IP for A
24103 and we know that server B rejects most-but-not all connections to
24104 port 80, we would previously reject the connection. Now, we assume
24105 the user knows what they were asking for. Fixes bug 752. Bugfix
24106 on 0.0.9rc5. Diagnosed by BarkerJr.
24107 - If we overrun our per-second write limits a little, count this as
24108 having used up our write allocation for the second, and choke
24109 outgoing directory writes. Previously, we had only counted this when
24110 we had met our limits precisely. Fixes bug 824. Patch from by rovv.
24111 Bugfix on 0.2.0.x (??).
24112 - Remove the old v2 directory authority 'lefkada' from the default
24113 list. It has been gone for many months.
24114 - Stop doing unaligned memory access that generated bus errors on
24115 sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
24116 - Make USR2 log-level switch take effect immediately. Bugfix on
24119 o Minor bugfixes (controller):
24120 - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
24121 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
24124 Changes in version 0.2.0.31 - 2008-09-03
24125 Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
24126 a big bug we're seeing where in rare cases traffic from one Tor stream
24127 gets mixed into another stream, and fixes a variety of smaller issues.
24130 - Make sure that two circuits can never exist on the same connection
24131 with the same circuit ID, even if one is marked for close. This
24132 is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
24133 - Relays now reject risky extend cells: if the extend cell includes
24134 a digest of all zeroes, or asks to extend back to the relay that
24135 sent the extend cell, tear down the circuit. Ideas suggested
24137 - If not enough of our entry guards are available so we add a new
24138 one, we might use the new one even if it overlapped with the
24139 current circuit's exit relay (or its family). Anonymity bugfix
24140 pointed out by rovv.
24143 - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
24144 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
24145 - Correctly detect the presence of the linux/netfilter_ipv4.h header
24146 when building against recent kernels. Bugfix on 0.1.2.1-alpha.
24147 - Pick size of default geoip filename string correctly on windows.
24148 Fixes bug 806. Bugfix on 0.2.0.30.
24149 - Make the autoconf script accept the obsolete --with-ssl-dir
24150 option as an alias for the actually-working --with-openssl-dir
24151 option. Fix the help documentation to recommend --with-openssl-dir.
24152 Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
24153 - When using the TransPort option on OpenBSD, and using the User
24154 option to change UID and drop privileges, make sure to open
24155 /dev/pf before dropping privileges. Fixes bug 782. Patch from
24156 Christopher Davis. Bugfix on 0.1.2.1-alpha.
24157 - Try to attach connections immediately upon receiving a RENDEZVOUS2
24158 or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
24159 on the client side when connecting to a hidden service. Bugfix
24160 on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
24161 - When closing an application-side connection because its circuit is
24162 getting torn down, generate the stream event correctly. Bugfix on
24163 0.1.2.x. Anonymous patch.
24166 Changes in version 0.2.0.30 - 2008-07-15
24167 This new stable release switches to a more efficient directory
24168 distribution design, adds features to make connections to the Tor
24169 network harder to block, allows Tor to act as a DNS proxy, adds separate
24170 rate limiting for relayed traffic to make it easier for clients to
24171 become relays, fixes a variety of potential anonymity problems, and
24172 includes the usual huge pile of other features and bug fixes.
24174 o New v3 directory design:
24175 - Tor now uses a new way to learn about and distribute information
24176 about the network: the directory authorities vote on a common
24177 network status document rather than each publishing their own
24178 opinion. Now clients and caches download only one networkstatus
24179 document to bootstrap, rather than downloading one for each
24180 authority. Clients only download router descriptors listed in
24181 the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
24183 - Set up moria1, tor26, and dizum as v3 directory authorities
24184 in addition to being v2 authorities. Also add three new ones:
24185 ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
24186 dannenberg (run by CCC).
24187 - Switch to multi-level keys for directory authorities: now their
24188 long-term identity key can be kept offline, and they periodically
24189 generate a new signing key. Clients fetch the "key certificates"
24190 to keep up to date on the right keys. Add a standalone tool
24191 "tor-gencert" to generate key certificates. Implements proposal 103.
24192 - Add a new V3AuthUseLegacyKey config option to make it easier for
24193 v3 authorities to change their identity keys if another bug like
24194 Debian's OpenSSL RNG flaw appears.
24195 - Authorities and caches fetch the v2 networkstatus documents
24196 less often, now that v3 is recommended.
24198 o Make Tor connections stand out less on the wire:
24199 - Use an improved TLS handshake designed by Steven Murdoch in proposal
24200 124, as revised in proposal 130. The new handshake is meant to
24201 be harder for censors to fingerprint, and it adds the ability
24202 to detect certain kinds of man-in-the-middle traffic analysis
24203 attacks. The new handshake format includes version negotiation for
24204 OR connections as described in proposal 105, which will allow us
24205 to improve Tor's link protocol more safely in the future.
24206 - Enable encrypted directory connections by default for non-relays,
24207 so censor tools that block Tor directory connections based on their
24208 plaintext patterns will no longer work. This means Tor works in
24209 certain censored countries by default again.
24210 - Stop including recognizeable strings in the commonname part of
24211 Tor's x509 certificates.
24213 o Implement bridge relays:
24214 - Bridge relays (or "bridges" for short) are Tor relays that aren't
24215 listed in the main Tor directory. Since there is no complete public
24216 list of them, even an ISP that is filtering connections to all the
24217 known Tor relays probably won't be able to block all the bridges.
24218 See doc/design-paper/blocking.pdf and proposal 125 for details.
24219 - New config option BridgeRelay that specifies you want to be a
24220 bridge relay rather than a normal relay. When BridgeRelay is set
24221 to 1, then a) you cache dir info even if your DirPort ins't on,
24222 and b) the default for PublishServerDescriptor is now "bridge"
24223 rather than "v2,v3".
24224 - New config option "UseBridges 1" for clients that want to use bridge
24225 relays instead of ordinary entry guards. Clients then specify
24226 bridge relays by adding "Bridge" lines to their config file. Users
24227 can learn about a bridge relay either manually through word of
24228 mouth, or by one of our rate-limited mechanisms for giving out
24229 bridge addresses without letting an attacker easily enumerate them
24230 all. See https://www.torproject.org/bridges for details.
24231 - Bridge relays behave like clients with respect to time intervals
24232 for downloading new v3 consensus documents -- otherwise they
24233 stand out. Bridge users now wait until the end of the interval,
24234 so their bridge relay will be sure to have a new consensus document.
24236 o Implement bridge directory authorities:
24237 - Bridge authorities are like normal directory authorities, except
24238 they don't serve a list of known bridges. Therefore users that know
24239 a bridge's fingerprint can fetch a relay descriptor for that bridge,
24240 including fetching updates e.g. if the bridge changes IP address,
24241 yet an attacker can't just fetch a list of all the bridges.
24242 - Set up Tonga as the default bridge directory authority.
24243 - Bridge authorities refuse to serve bridge descriptors or other
24244 bridge information over unencrypted connections (that is, when
24245 responding to direct DirPort requests rather than begin_dir cells.)
24246 - Bridge directory authorities do reachability testing on the
24247 bridges they know. They provide router status summaries to the
24248 controller via "getinfo ns/purpose/bridge", and also dump summaries
24249 to a file periodically, so we can keep internal stats about which
24250 bridges are functioning.
24251 - If bridge users set the UpdateBridgesFromAuthority config option,
24252 but the digest they ask for is a 404 on the bridge authority,
24253 they fall back to contacting the bridge directly.
24254 - Bridges always use begin_dir to publish their server descriptor to
24255 the bridge authority using an anonymous encrypted tunnel.
24256 - Early work on a "bridge community" design: if bridge authorities set
24257 the BridgePassword config option, they will serve a snapshot of
24258 known bridge routerstatuses from their DirPort to anybody who
24259 knows that password. Unset by default.
24260 - Tor now includes an IP-to-country GeoIP file, so bridge relays can
24261 report sanitized aggregated summaries in their extra-info documents
24262 privately to the bridge authority, listing which countries are
24263 able to reach them. We hope this mechanism will let us learn when
24264 certain countries start trying to block bridges.
24265 - Bridge authorities write bridge descriptors to disk, so they can
24266 reload them after a reboot. They can also export the descriptors
24267 to other programs, so we can distribute them to blocked users via
24268 the BridgeDB interface, e.g. via https://bridges.torproject.org/
24269 and bridges@torproject.org.
24271 o Tor can be a DNS proxy:
24272 - The new client-side DNS proxy feature replaces the need for
24273 dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
24274 for DNS requests on port 9999, use the Tor network to resolve them
24275 anonymously, and send the reply back like a regular DNS server.
24276 The code still only implements a subset of DNS.
24277 - Add a new AutomapHostsOnResolve option: when it is enabled, any
24278 resolve request for hosts matching a given pattern causes Tor to
24279 generate an internal virtual address mapping for that host. This
24280 allows DNSPort to work sensibly with hidden service users. By
24281 default, .exit and .onion addresses are remapped; the list of
24282 patterns can be reconfigured with AutomapHostsSuffixes.
24283 - Add an "-F" option to tor-resolve to force a resolve for a .onion
24284 address. Thanks to the AutomapHostsOnResolve option, this is no
24285 longer a completely silly thing to do.
24287 o Major features (relay usability):
24288 - New config options RelayBandwidthRate and RelayBandwidthBurst:
24289 a separate set of token buckets for relayed traffic. Right now
24290 relayed traffic is defined as answers to directory requests, and
24291 OR connections that don't have any local circuits on them. See
24292 proposal 111 for details.
24293 - Create listener connections before we setuid to the configured
24294 User and Group. Now non-Windows users can choose port values
24295 under 1024, start Tor as root, and have Tor bind those ports
24296 before it changes to another UID. (Windows users could already
24298 - Added a new ConstrainedSockets config option to set SO_SNDBUF and
24299 SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
24300 on "vserver" accounts. Patch from coderman.
24302 o Major features (directory authorities):
24303 - Directory authorities track weighted fractional uptime and weighted
24304 mean-time-between failures for relays. WFU is suitable for deciding
24305 whether a node is "usually up", while MTBF is suitable for deciding
24306 whether a node is "likely to stay up." We need both, because
24307 "usually up" is a good requirement for guards, while "likely to
24308 stay up" is a good requirement for long-lived connections.
24309 - Directory authorities use a new formula for selecting which relays
24310 to advertise as Guards: they must be in the top 7/8 in terms of
24311 how long we have known about them, and above the median of those
24312 nodes in terms of weighted fractional uptime.
24313 - Directory authorities use a new formula for selecting which relays
24314 to advertise as Stable: when we have 4 or more days of data, use
24315 median measured MTBF rather than median declared uptime. Implements
24317 - Directory authorities accept and serve "extra info" documents for
24318 routers. Routers now publish their bandwidth-history lines in the
24319 extra-info docs rather than the main descriptor. This step saves
24320 60% (!) on compressed router descriptor downloads. Servers upload
24321 extra-info docs to any authority that accepts them; directory
24322 authorities now allow multiple router descriptors and/or extra
24323 info documents to be uploaded in a single go. Authorities, and
24324 caches that have been configured to download extra-info documents,
24325 download them as needed. Implements proposal 104.
24326 - Authorities now list relays who have the same nickname as
24327 a different named relay, but list them with a new flag:
24328 "Unnamed". Now we can make use of relays that happen to pick the
24329 same nickname as a server that registered two years ago and then
24330 disappeared. Implements proposal 122.
24331 - Store routers in a file called cached-descriptors instead of in
24332 cached-routers. Initialize cached-descriptors from cached-routers
24333 if the old format is around. The new format allows us to store
24334 annotations along with descriptors, to record the time we received
24335 each descriptor, its source, and its purpose: currently one of
24336 general, controller, or bridge.
24338 o Major features (other):
24339 - New config options WarnPlaintextPorts and RejectPlaintextPorts so
24340 Tor can warn and/or refuse connections to ports commonly used with
24341 vulnerable-plaintext protocols. Currently we warn on ports 23,
24342 109, 110, and 143, but we don't reject any. Based on proposal 129
24343 by Kevin Bauer and Damon McCoy.
24344 - Integrate Karsten Loesing's Google Summer of Code project to publish
24345 hidden service descriptors on a set of redundant relays that are a
24346 function of the hidden service address. Now we don't have to rely
24347 on three central hidden service authorities for publishing and
24348 fetching every hidden service descriptor. Implements proposal 114.
24349 - Allow tunnelled directory connections to ask for an encrypted
24350 "begin_dir" connection or an anonymized "uses a full Tor circuit"
24351 connection independently. Now we can make anonymized begin_dir
24352 connections for (e.g.) more secure hidden service posting and
24355 o Major bugfixes (crashes and assert failures):
24356 - Stop imposing an arbitrary maximum on the number of file descriptors
24357 used for busy servers. Bug reported by Olaf Selke; patch from
24359 - Avoid possible failures when generating a directory with routers
24360 with over-long versions strings, or too many flags set.
24361 - Fix a rare assert error when we're closing one of our threads:
24362 use a mutex to protect the list of logs, so we never write to the
24363 list as it's being freed. Fixes the very rare bug 575, which is
24364 kind of the revenge of bug 222.
24365 - Avoid segfault in the case where a badly behaved v2 versioning
24366 directory sends a signed networkstatus with missing client-versions.
24367 - When we hit an EOF on a log (probably because we're shutting down),
24368 don't try to remove the log from the list: just mark it as
24369 unusable. (Bulletproofs against bug 222.)
24371 o Major bugfixes (code security fixes):
24372 - Detect size overflow in zlib code. Reported by Justin Ferguson and
24374 - Rewrite directory tokenization code to never run off the end of
24375 a string. Fixes bug 455. Patch from croup.
24376 - Be more paranoid about overwriting sensitive memory on free(),
24377 as a defensive programming tactic to ensure forward secrecy.
24379 o Major bugfixes (anonymity fixes):
24380 - Reject requests for reverse-dns lookup of names that are in
24381 a private address space. Patch from lodger.
24382 - Never report that we've used more bandwidth than we're willing to
24383 relay: it leaks how much non-relay traffic we're using. Resolves
24385 - As a client, do not believe any server that tells us that an
24386 address maps to an internal address space.
24387 - Warn about unsafe ControlPort configurations.
24388 - Directory authorities now call routers Fast if their bandwidth is
24389 at least 100KB/s, and consider their bandwidth adequate to be a
24390 Guard if it is at least 250KB/s, no matter the medians. This fix
24391 complements proposal 107.
24392 - Directory authorities now never mark more than 2 servers per IP as
24393 Valid and Running (or 5 on addresses shared by authorities).
24394 Implements proposal 109, by Kevin Bauer and Damon McCoy.
24395 - If we're a relay, avoid picking ourselves as an introduction point,
24396 a rendezvous point, or as the final hop for internal circuits. Bug
24397 reported by taranis and lodger.
24398 - Exit relays that are used as a client can now reach themselves
24399 using the .exit notation, rather than just launching an infinite
24400 pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
24401 - Fix a bug where, when we were choosing the 'end stream reason' to
24402 put in our relay end cell that we send to the exit relay, Tor
24403 clients on Windows were sometimes sending the wrong 'reason'. The
24404 anonymity problem is that exit relays may be able to guess whether
24405 the client is running Windows, thus helping partition the anonymity
24406 set. Down the road we should stop sending reasons to exit relays,
24407 or otherwise prevent future versions of this bug.
24408 - Only update guard status (usable / not usable) once we have
24409 enough directory information. This was causing us to discard all our
24410 guards on startup if we hadn't been running for a few weeks. Fixes
24412 - When our directory information has been expired for a while, stop
24413 being willing to build circuits using it. Fixes bug 401.
24415 o Major bugfixes (peace of mind for relay operators)
24416 - Non-exit relays no longer answer "resolve" relay cells, so they
24417 can't be induced to do arbitrary DNS requests. (Tor clients already
24418 avoid using non-exit relays for resolve cells, but now servers
24419 enforce this too.) Fixes bug 619. Patch from lodger.
24420 - When we setconf ClientOnly to 1, close any current OR and Dir
24421 listeners. Reported by mwenge.
24423 o Major bugfixes (other):
24424 - If we only ever used Tor for hidden service lookups or posts, we
24425 would stop building circuits and start refusing connections after
24426 24 hours, since we falsely believed that Tor was dormant. Reported
24428 - Add a new __HashedControlSessionPassword option for controllers
24429 to use for one-off session password hashes that shouldn't get
24430 saved to disk by SAVECONF --- Vidalia users were accumulating a
24431 pile of HashedControlPassword lines in their torrc files, one for
24432 each time they had restarted Tor and then clicked Save. Make Tor
24433 automatically convert "HashedControlPassword" to this new option but
24434 only when it's given on the command line. Partial fix for bug 586.
24435 - Patch from "Andrew S. Lists" to catch when we contact a directory
24436 mirror at IP address X and he says we look like we're coming from
24437 IP address X. Otherwise this would screw up our address detection.
24438 - Reject uploaded descriptors and extrainfo documents if they're
24439 huge. Otherwise we'll cache them all over the network and it'll
24440 clog everything up. Suggested by Aljosha Judmayer.
24441 - When a hidden service was trying to establish an introduction point,
24442 and Tor *did* manage to reuse one of the preemptively built
24443 circuits, it didn't correctly remember which one it used,
24444 so it asked for another one soon after, until there were no
24445 more preemptive circuits, at which point it launched one from
24446 scratch. Bugfix on 0.0.9.x.
24448 o Rate limiting and load balancing improvements:
24449 - When we add data to a write buffer in response to the data on that
24450 write buffer getting low because of a flush, do not consider the
24451 newly added data as a candidate for immediate flushing, but rather
24452 make it wait until the next round of writing. Otherwise, we flush
24453 and refill recursively, and a single greedy TLS connection can
24454 eat all of our bandwidth.
24455 - When counting the number of bytes written on a TLS connection,
24456 look at the BIO actually used for writing to the network, not
24457 at the BIO used (sometimes) to buffer data for the network.
24458 Looking at different BIOs could result in write counts on the
24459 order of ULONG_MAX. Fixes bug 614.
24460 - If we change our MaxAdvertisedBandwidth and then reload torrc,
24461 Tor won't realize it should publish a new relay descriptor. Fixes
24462 bug 688, reported by mfr.
24463 - Avoid using too little bandwidth when our clock skips a few seconds.
24464 - Choose which bridge to use proportional to its advertised bandwidth,
24465 rather than uniformly at random. This should speed up Tor for
24466 bridge users. Also do this for people who set StrictEntryNodes.
24468 o Bootstrapping faster and building circuits more intelligently:
24469 - Fix bug 660 that was preventing us from knowing that we should
24470 preemptively build circuits to handle expected directory requests.
24471 - When we're checking if we have enough dir info for each relay
24472 to begin establishing circuits, make sure that we actually have
24473 the descriptor listed in the consensus, not just any descriptor.
24474 - Correctly notify one-hop connections when a circuit build has
24475 failed. Possible fix for bug 669. Found by lodger.
24476 - Clients now hold circuitless TLS connections open for 1.5 times
24477 MaxCircuitDirtiness (15 minutes), since it is likely that they'll
24478 rebuild a new circuit over them within that timeframe. Previously,
24479 they held them open only for KeepalivePeriod (5 minutes).
24481 o Performance improvements (memory):
24482 - Add OpenBSD malloc code from "phk" as an optional malloc
24483 replacement on Linux: some glibc libraries do very poorly with
24484 Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
24485 ./configure to get the replacement malloc code.
24486 - Switch our old ring buffer implementation for one more like that
24487 used by free Unix kernels. The wasted space in a buffer with 1mb
24488 of data will now be more like 8k than 1mb. The new implementation
24489 also avoids realloc();realloc(); patterns that can contribute to
24490 memory fragmentation.
24491 - Change the way that Tor buffers data that it is waiting to write.
24492 Instead of queueing data cells in an enormous ring buffer for each
24493 client->OR or OR->OR connection, we now queue cells on a separate
24494 queue for each circuit. This lets us use less slack memory, and
24495 will eventually let us be smarter about prioritizing different kinds
24497 - Reference-count and share copies of address policy entries; only 5%
24498 of them were actually distinct.
24499 - Tune parameters for cell pool allocation to minimize amount of
24501 - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
24502 for every single inactive connection_t. Free items from the
24503 4k/16k-buffer free lists when they haven't been used for a while.
24504 - Make memory debugging information describe more about history
24505 of cell allocation, so we can help reduce our memory use.
24506 - Be even more aggressive about releasing RAM from small
24507 empty buffers. Thanks to our free-list code, this shouldn't be too
24508 performance-intensive.
24509 - Log malloc statistics from mallinfo() on platforms where it exists.
24510 - Use memory pools to allocate cells with better speed and memory
24511 efficiency, especially on platforms where malloc() is inefficient.
24512 - Add a --with-tcmalloc option to the configure script to link
24513 against tcmalloc (if present). Does not yet search for non-system
24516 o Performance improvements (socket management):
24517 - Count the number of open sockets separately from the number of
24518 active connection_t objects. This will let us avoid underusing
24519 our allocated connection limit.
24520 - We no longer use socket pairs to link an edge connection to an
24521 anonymous directory connection or a DirPort test connection.
24522 Instead, we track the link internally and transfer the data
24523 in-process. This saves two sockets per "linked" connection (at the
24524 client and at the server), and avoids the nasty Windows socketpair()
24526 - We were leaking a file descriptor if Tor started with a zero-length
24527 cached-descriptors file. Patch by "freddy77".
24529 o Performance improvements (CPU use):
24530 - Never walk through the list of logs if we know that no log target
24531 is interested in a given message.
24532 - Call routerlist_remove_old_routers() much less often. This should
24533 speed startup, especially on directory caches.
24534 - Base64 decoding was actually showing up on our profile when parsing
24535 the initial descriptor file; switch to an in-process all-at-once
24536 implementation that's about 3.5x times faster than calling out to
24538 - Use a slightly simpler string hashing algorithm (copying Python's
24539 instead of Java's) and optimize our digest hashing algorithm to take
24540 advantage of 64-bit platforms and to remove some possibly-costly
24542 - When implementing AES counter mode, update only the portions of the
24543 counter buffer that need to change, and don't keep separate
24544 network-order and host-order counters on big-endian hosts (where
24545 they are the same).
24546 - Add an in-place version of aes_crypt() so that we can avoid doing a
24547 needless memcpy() call on each cell payload.
24548 - Use Critical Sections rather than Mutexes for synchronizing threads
24549 on win32; Mutexes are heavier-weight, and designed for synchronizing
24552 o Performance improvements (bandwidth use):
24553 - Don't try to launch new descriptor downloads quite so often when we
24554 already have enough directory information to build circuits.
24555 - Version 1 directories are no longer generated in full. Instead,
24556 authorities generate and serve "stub" v1 directories that list
24557 no servers. This will stop Tor versions 0.1.0.x and earlier from
24558 working, but (for security reasons) nobody should be running those
24560 - Avoid going directly to the directory authorities even if you're a
24561 relay, if you haven't found yourself reachable yet or if you've
24562 decided not to advertise your dirport yet. Addresses bug 556.
24563 - If we've gone 12 hours since our last bandwidth check, and we
24564 estimate we have less than 50KB bandwidth capacity but we could
24565 handle more, do another bandwidth test.
24566 - Support "If-Modified-Since" when answering HTTP requests for
24567 directories, running-routers documents, and v2 and v3 networkstatus
24568 documents. (There's no need to support it for router descriptors,
24569 since those are downloaded by descriptor digest.)
24570 - Stop fetching directory info so aggressively if your DirPort is
24571 on but your ORPort is off; stop fetching v2 dir info entirely.
24572 You can override these choices with the new FetchDirInfoEarly
24575 o Changed config option behavior (features):
24576 - Configuration files now accept C-style strings as values. This
24577 helps encode characters not allowed in the current configuration
24578 file format, such as newline or #. Addresses bug 557.
24579 - Add hidden services and DNSPorts to the list of things that make
24580 Tor accept that it has running ports. Change starting Tor with no
24581 ports from a fatal error to a warning; we might change it back if
24582 this turns out to confuse anybody. Fixes bug 579.
24583 - Make PublishServerDescriptor default to 1, so the default doesn't
24584 have to change as we invent new directory protocol versions.
24585 - Allow people to say PreferTunnelledDirConns rather than
24586 PreferTunneledDirConns, for those alternate-spellers out there.
24587 - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
24588 accommodate the growing number of servers that use the default
24589 and are reaching it.
24590 - Make it possible to enable HashedControlPassword and
24591 CookieAuthentication at the same time.
24592 - When a TrackHostExits-chosen exit fails too many times in a row,
24593 stop using it. Fixes bug 437.
24595 o Changed config option behavior (bugfixes):
24596 - Do not read the configuration file when we've only been told to
24597 generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
24598 based on patch from Sebastian Hahn.
24599 - Actually validate the options passed to AuthDirReject,
24600 AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
24601 - Make "ClientOnly 1" config option disable directory ports too.
24602 - Don't stop fetching descriptors when FetchUselessDescriptors is
24603 set, even if we stop asking for circuits. Bug reported by tup
24605 - Servers used to decline to publish their DirPort if their
24606 BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
24607 they look only at BandwidthRate and RelayBandwidthRate.
24608 - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
24609 minus 1 byte: the actual maximum declared bandwidth.
24610 - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
24611 - Make the NodeFamilies config option work. (Reported by
24612 lodger -- it has never actually worked, even though we added it
24614 - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
24615 now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
24617 o New config options:
24618 - New configuration options AuthDirMaxServersPerAddr and
24619 AuthDirMaxServersperAuthAddr to override default maximum number
24620 of servers allowed on a single IP address. This is important for
24621 running a test network on a single host.
24622 - Three new config options (AlternateDirAuthority,
24623 AlternateBridgeAuthority, and AlternateHSAuthority) that let the
24624 user selectively replace the default directory authorities by type,
24625 rather than the all-or-nothing replacement that DirServer offers.
24626 - New config options AuthDirBadDir and AuthDirListBadDirs for
24627 authorities to mark certain relays as "bad directories" in the
24628 networkstatus documents. Also supports the "!baddir" directive in
24629 the approved-routers file.
24630 - New config option V2AuthoritativeDirectory that all v2 directory
24631 authorities must set. This lets v3 authorities choose not to serve
24632 v2 directory information.
24634 o Minor features (other):
24635 - When we're not serving v2 directory information, there is no reason
24636 to actually keep any around. Remove the obsolete files and directory
24637 on startup if they are very old and we aren't going to serve them.
24638 - When we negotiate a v2 link-layer connection (not yet implemented),
24639 accept RELAY_EARLY cells and turn them into RELAY cells if we've
24640 negotiated a v1 connection for their next step. Initial steps for
24642 - When we have no consensus, check FallbackNetworkstatusFile (defaults
24643 to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
24644 we can start out knowing some directory caches. We don't ship with
24645 a fallback consensus by default though, because it was making
24646 bootstrapping take too long while we tried many down relays.
24647 - Authorities send back an X-Descriptor-Not-New header in response to
24648 an accepted-but-discarded descriptor upload. Partially implements
24650 - If we find a cached-routers file that's been sitting around for more
24651 than 28 days unmodified, then most likely it's a leftover from
24652 when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
24654 - When we (as a cache) download a descriptor because it was listed
24655 in a consensus, remember when the consensus was supposed to expire,
24656 and don't expire the descriptor until then.
24657 - Optionally (if built with -DEXPORTMALLINFO) export the output
24658 of mallinfo via http, as tor/mallinfo.txt. Only accessible
24660 - Tag every guard node in our state file with the version that
24661 we believe added it, or with our own version if we add it. This way,
24662 if a user temporarily runs an old version of Tor and then switches
24663 back to a new one, she doesn't automatically lose her guards.
24664 - When somebody requests a list of statuses or servers, and we have
24665 none of those, return a 404 rather than an empty 200.
24666 - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
24668 - Add an HSAuthorityRecordStats option that hidden service authorities
24669 can use to track statistics of overall hidden service usage without
24670 logging information that would be as useful to an attacker.
24671 - Allow multiple HiddenServicePort directives with the same virtual
24672 port; when they occur, the user is sent round-robin to one
24673 of the target ports chosen at random. Partially fixes bug 393 by
24674 adding limited ad-hoc round-robining.
24675 - Revamp file-writing logic so we don't need to have the entire
24676 contents of a file in memory at once before we write to disk. Tor,
24679 o Minor bugfixes (other):
24680 - Alter the code that tries to recover from unhandled write
24681 errors, to not try to flush onto a socket that's given us
24683 - Directory mirrors no longer include a guess at the client's IP
24684 address if the connection appears to be coming from the same /24
24685 network; it was producing too many wrong guesses.
24686 - If we're trying to flush the last bytes on a connection (for
24687 example, when answering a directory request), reset the
24688 time-to-give-up timeout every time we manage to write something
24690 - Reject router descriptors with out-of-range bandwidthcapacity or
24691 bandwidthburst values.
24692 - If we can't expand our list of entry guards (e.g. because we're
24693 using bridges or we have StrictEntryNodes set), don't mark relays
24694 down when they fail a directory request. Otherwise we're too quick
24695 to mark all our entry points down.
24696 - Authorities no longer send back "400 you're unreachable please fix
24697 it" errors to Tor servers that aren't online all the time. We're
24698 supposed to tolerate these servers now.
24699 - Let directory authorities startup even when they can't generate
24700 a descriptor immediately, e.g. because they don't know their
24702 - Correctly enforce that elements of directory objects do not appear
24703 more often than they are allowed to appear.
24704 - Stop allowing hibernating servers to be "stable" or "fast".
24705 - On Windows, we were preventing other processes from reading
24706 cached-routers while Tor was running. (Reported by janbar)
24707 - Check return values from pthread_mutex functions.
24708 - When opening /dev/null in finish_daemonize(), do not pass the
24709 O_CREAT flag. Fortify was complaining, and correctly so. Fixes
24710 bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
24712 o Controller features:
24713 - The GETCONF command now escapes and quotes configuration values
24714 that don't otherwise fit into the torrc file.
24715 - The SETCONF command now handles quoted values correctly.
24716 - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
24717 ask about source, timestamp of arrival, purpose, etc. We need
24718 something like this to help Vidalia not do GeoIP lookups on bridge
24720 - Allow multiple HashedControlPassword config lines, to support
24721 multiple controller passwords.
24722 - Accept LF instead of CRLF on controller, since some software has a
24723 hard time generating real Internet newlines.
24724 - Add GETINFO values for the server status events
24725 "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
24727 - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
24728 GETINFO for Torstat to use until it can switch to using extrainfos.
24729 - New config option CookieAuthFile to choose a new location for the
24730 cookie authentication file, and config option
24731 CookieAuthFileGroupReadable to make it group-readable.
24732 - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
24733 match requests to applications. Patch from Robert Hogan.
24734 - Add a RESOLVE command to launch hostname lookups. Original patch
24736 - Add GETINFO status/enough-dir-info to let controllers tell whether
24737 Tor has downloaded sufficient directory information. Patch from Tup.
24738 - You can now use the ControlSocket option to tell Tor to listen for
24739 controller connections on Unix domain sockets on systems that
24740 support them. Patch from Peter Palfrader.
24741 - New "GETINFO address-mappings/*" command to get address mappings
24742 with expiry information. "addr-mappings/*" is now deprecated.
24744 - Add a new config option __DisablePredictedCircuits designed for
24745 use by the controller, when we don't want Tor to build any circuits
24747 - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
24748 so we can exit from the middle of the circuit.
24749 - Implement "getinfo status/circuit-established".
24750 - Implement "getinfo status/version/..." so a controller can tell
24751 whether the current version is recommended, and whether any versions
24752 are good, and how many authorities agree. Patch from "shibz".
24753 - Controllers should now specify cache=no or cache=yes when using
24754 the +POSTDESCRIPTOR command.
24755 - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
24756 Robert Hogan. Fixes the first part of bug 681.
24757 - When reporting clock skew, and we know that the clock is _at least
24758 as skewed_ as some value, but we don't know the actual value,
24759 report the value as a "minimum skew."
24761 o Controller bugfixes:
24762 - Generate "STATUS_SERVER" events rather than misspelled
24763 "STATUS_SEVER" events. Caught by mwenge.
24764 - Reject controller commands over 1MB in length, so rogue
24765 processes can't run us out of memory.
24766 - Change the behavior of "getinfo status/good-server-descriptor"
24767 so it doesn't return failure when any authority disappears.
24768 - Send NAMESERVER_STATUS messages for a single failed nameserver
24770 - When the DANGEROUS_VERSION controller status event told us we're
24771 running an obsolete version, it used the string "OLD" to describe
24772 it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
24773 "OBSOLETE" in both cases.
24774 - Respond to INT and TERM SIGNAL commands before we execute the
24775 signal, in case the signal shuts us down. We had a patch in
24776 0.1.2.1-alpha that tried to do this by queueing the response on
24777 the connection's buffer before shutting down, but that really
24778 isn't the same thing at all. Bug located by Matt Edman.
24779 - Provide DNS expiry times in GMT, not in local time. For backward
24780 compatibility, ADDRMAP events only provide GMT expiry in an extended
24781 field. "GETINFO address-mappings" always does the right thing.
24782 - Use CRLF line endings properly in NS events.
24783 - Make 'getinfo fingerprint' return a 551 error if we're not a
24784 server, so we match what the control spec claims we do. Reported
24786 - Fix a typo in an error message when extendcircuit fails that
24787 caused us to not follow the \r\n-based delimiter protocol. Reported
24789 - When tunneling an encrypted directory connection, and its first
24790 circuit fails, do not leave it unattached and ask the controller
24791 to deal. Fixes the second part of bug 681.
24792 - Treat some 403 responses from directory servers as INFO rather than
24793 WARN-severity events.
24795 o Portability / building / compiling:
24796 - When building with --enable-gcc-warnings, check for whether Apple's
24797 warning "-Wshorten-64-to-32" is available.
24798 - Support compilation to target iPhone; patch from cjacker huang.
24799 To build for iPhone, pass the --enable-iphone option to configure.
24800 - Port Tor to build and run correctly on Windows CE systems, using
24801 the wcecompat library. Contributed by Valerio Lupi.
24802 - Detect non-ASCII platforms (if any still exist) and refuse to
24803 build there: some of our code assumes that 'A' is 65 and so on.
24804 - Clear up some MIPSPro compiler warnings.
24805 - Make autoconf search for libevent, openssl, and zlib consistently.
24806 - Update deprecated macros in configure.in.
24807 - When warning about missing headers, tell the user to let us
24808 know if the compile succeeds anyway, so we can downgrade the
24810 - Include the current subversion revision as part of the version
24811 string: either fetch it directly if we're in an SVN checkout, do
24812 some magic to guess it if we're in an SVK checkout, or use
24813 the last-detected version if we're building from a .tar.gz.
24814 Use this version consistently in log messages.
24815 - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
24816 - Read resolv.conf files correctly on platforms where read() returns
24817 partial results on small file reads.
24818 - Build without verbose warnings even on gcc 4.2 and 4.3.
24819 - On Windows, correctly detect errors when listing the contents of
24820 a directory. Fix from lodger.
24821 - Run 'make test' as part of 'make dist', so we stop releasing so
24822 many development snapshots that fail their unit tests.
24823 - Add support to detect Libevent versions in the 1.4.x series
24825 - Add command-line arguments to unit-test executable so that we can
24826 invoke any chosen test from the command line rather than having
24827 to run the whole test suite at once; and so that we can turn on
24828 logging for the unit tests.
24829 - Do not automatically run configure from autogen.sh. This
24830 non-standard behavior tended to annoy people who have built other
24832 - Fix a macro/CPP interaction that was confusing some compilers:
24833 some GCCs don't like #if/#endif pairs inside macro arguments.
24835 - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
24836 Fixes bug 704; fix from Steven Murdoch.
24837 - Correctly detect transparent proxy support on Linux hosts that
24838 require in.h to be included before netfilter_ipv4.h. Patch
24841 o Logging improvements:
24842 - When we haven't had any application requests lately, don't bother
24843 logging that we have expired a bunch of descriptors.
24844 - When attempting to open a logfile fails, tell us why.
24845 - Only log guard node status when guard node status has changed.
24846 - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
24847 make "INFO" 75% less verbose.
24848 - When SafeLogging is disabled, log addresses along with all TLS
24850 - Report TLS "zero return" case as a "clean close" and "IO error"
24851 as a "close". Stop calling closes "unexpected closes": existing
24852 Tors don't use SSL_close(), so having a connection close without
24853 the TLS shutdown handshake is hardly unexpected.
24854 - When we receive a consensus from the future, warn about skew.
24855 - Make "not enough dir info yet" warnings describe *why* Tor feels
24856 it doesn't have enough directory info yet.
24857 - On the USR1 signal, when dmalloc is in use, log the top 10 memory
24858 consumers. (We already do this on HUP.)
24859 - Give more descriptive well-formedness errors for out-of-range
24860 hidden service descriptor/protocol versions.
24861 - Stop recommending that every server operator send mail to tor-ops.
24862 Resolves bug 597. Bugfix on 0.1.2.x.
24863 - Improve skew reporting: try to give the user a better log message
24864 about how skewed they are, and how much this matters.
24865 - New --quiet command-line option to suppress the default console log.
24866 Good in combination with --hash-password.
24867 - Don't complain that "your server has not managed to confirm that its
24868 ports are reachable" if we haven't been able to build any circuits
24870 - Detect the reason for failing to mmap a descriptor file we just
24871 wrote, and give a more useful log message. Fixes bug 533.
24872 - Always prepend "Bug: " to any log message about a bug.
24873 - When dumping memory usage, list bytes used in buffer memory
24875 - When running with dmalloc, dump more stats on hup and on exit.
24876 - Put a platform string (e.g. "Linux i686") in the startup log
24877 message, so when people paste just their logs, we know if it's
24878 OpenBSD or Windows or what.
24879 - When logging memory usage, break down memory used in buffers by
24881 - When we are reporting the DirServer line we just parsed, we were
24882 logging the second stanza of the key fingerprint, not the first.
24883 - Even though Windows is equally happy with / and \ as path separators,
24884 try to use \ consistently on Windows and / consistently on Unix: it
24885 makes the log messages nicer.
24886 - On OSX, stop warning the user that kqueue support in libevent is
24887 "experimental", since it seems to have worked fine for ages.
24889 o Contributed scripts and tools:
24890 - Update linux-tor-prio.sh script to allow QoS based on the uid of
24891 the Tor process. Patch from Marco Bonetti with tweaks from Mike
24893 - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
24894 Unix users an easy way to script their Tor process (e.g. by
24895 adjusting bandwidth based on the time of the day).
24896 - In the exitlist script, only consider the most recently published
24897 server descriptor for each server. Also, when the user requests
24898 a list of servers that _reject_ connections to a given address,
24899 explicitly exclude the IPs that also have servers that accept
24900 connections to that address. Resolves bug 405.
24901 - Include a new contrib/tor-exit-notice.html file that exit relay
24902 operators can put on their website to help reduce abuse queries.
24904 o Newly deprecated features:
24905 - The status/version/num-versioning and status/version/num-concurring
24906 GETINFO controller options are no longer useful in the v3 directory
24907 protocol: treat them as deprecated, and warn when they're used.
24908 - The RedirectExits config option is now deprecated.
24910 o Removed features:
24911 - Drop the old code to choke directory connections when the
24912 corresponding OR connections got full: thanks to the cell queue
24913 feature, OR conns don't get full any more.
24914 - Remove the old "dns worker" server DNS code: it hasn't been default
24915 since 0.1.2.2-alpha, and all the servers are using the new
24917 - Remove the code to generate the oldest (v1) directory format.
24918 - Remove support for the old bw_accounting file: we've been storing
24919 bandwidth accounting information in the state file since
24920 0.1.2.5-alpha. This may result in bandwidth accounting errors
24921 if you try to upgrade from 0.1.1.x or earlier, or if you try to
24922 downgrade to 0.1.1.x or earlier.
24923 - Drop support for OpenSSL version 0.9.6. Just about nobody was using
24924 it, it had no AES, and it hasn't seen any security patches since
24926 - Stop overloading the circuit_t.onionskin field for both "onionskin
24927 from a CREATE cell that we are waiting for a cpuworker to be
24928 assigned" and "onionskin from an EXTEND cell that we are going to
24929 send to an OR as soon as we are connected". Might help with bug 600.
24930 - Remove the tor_strpartition() function: its logic was confused,
24931 and it was only used for one thing that could be implemented far
24933 - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
24934 and TorControl.py, as they use the old v0 controller protocol,
24935 and are obsoleted by TorFlow anyway.
24936 - Drop support for v1 rendezvous descriptors, since we never used
24937 them anyway, and the code has probably rotted by now. Based on
24938 patch from Karsten Loesing.
24939 - Stop allowing address masks that do not correspond to bit prefixes.
24940 We have warned about these for a really long time; now it's time
24941 to reject them. (Patch from croup.)
24942 - Remove an optimization in the AES counter-mode code that assumed
24943 that the counter never exceeded 2^68. When the counter can be set
24944 arbitrarily as an IV (as it is by Karsten's new hidden services
24945 code), this assumption no longer holds.
24946 - Disable the SETROUTERPURPOSE controller command: it is now
24950 Changes in version 0.1.2.19 - 2008-01-17
24951 Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
24952 exit policy a little bit more conservative so it's safer to run an
24953 exit relay on a home system, and fixes a variety of smaller issues.
24956 - Exit policies now reject connections that are addressed to a
24957 relay's public (external) IP address too, unless
24958 ExitPolicyRejectPrivate is turned off. We do this because too
24959 many relays are running nearby to services that trust them based
24960 on network address.
24963 - When the clock jumps forward a lot, do not allow the bandwidth
24964 buckets to become negative. Fixes bug 544.
24965 - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
24966 on every successful resolve. Reported by Mike Perry.
24967 - Purge old entries from the "rephist" database and the hidden
24968 service descriptor database even when DirPort is zero.
24969 - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
24970 requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
24971 crashing or mis-answering these requests.
24972 - When we decide to send a 503 response to a request for servers, do
24973 not then also send the server descriptors: this defeats the whole
24974 purpose. Fixes bug 539.
24977 - Changing the ExitPolicyRejectPrivate setting should cause us to
24978 rebuild our server descriptor.
24979 - Fix handling of hex nicknames when answering controller requests for
24980 networkstatus by name, or when deciding whether to warn about
24981 unknown routers in a config option. (Patch from mwenge.)
24982 - Fix a couple of hard-to-trigger autoconf problems that could result
24983 in really weird results on platforms whose sys/types.h files define
24984 nonstandard integer types.
24985 - Don't try to create the datadir when running --verify-config or
24986 --hash-password. Resolves bug 540.
24987 - If we were having problems getting a particular descriptor from the
24988 directory caches, and then we learned about a new descriptor for
24989 that router, we weren't resetting our failure count. Reported
24991 - Although we fixed bug 539 (where servers would send HTTP status 503
24992 responses _and_ send a body too), there are still servers out there
24993 that haven't upgraded. Therefore, make clients parse such bodies
24994 when they receive them.
24995 - Run correctly on systems where rlim_t is larger than unsigned long.
24996 This includes some 64-bit systems.
24997 - Run correctly on platforms (like some versions of OS X 10.5) where
24998 the real limit for number of open files is OPEN_FILES, not rlim_max
24999 from getrlimit(RLIMIT_NOFILES).
25000 - Avoid a spurious free on base64 failure.
25001 - Avoid segfaults on certain complex invocations of
25002 router_get_by_hexdigest().
25003 - Fix rare bug on REDIRECTSTREAM control command when called with no
25004 port set: it could erroneously report an error when none had
25008 Changes in version 0.1.2.18 - 2007-10-28
25009 Tor 0.1.2.18 fixes many problems including crash bugs, problems with
25010 hidden service introduction that were causing huge delays, and a big
25011 bug that was causing some servers to disappear from the network status
25012 lists for a few hours each day.
25014 o Major bugfixes (crashes):
25015 - If a connection is shut down abruptly because of something that
25016 happened inside connection_flushed_some(), do not call
25017 connection_finished_flushing(). Should fix bug 451:
25018 "connection_stop_writing: Assertion conn->write_event failed"
25019 Bugfix on 0.1.2.7-alpha.
25020 - Fix possible segfaults in functions called from
25021 rend_process_relay_cell().
25023 o Major bugfixes (hidden services):
25024 - Hidden services were choosing introduction points uniquely by
25025 hexdigest, but when constructing the hidden service descriptor
25026 they merely wrote the (potentially ambiguous) nickname.
25027 - Clients now use the v2 intro format for hidden service
25028 connections: they specify their chosen rendezvous point by identity
25029 digest rather than by (potentially ambiguous) nickname. These
25030 changes could speed up hidden service connections dramatically.
25032 o Major bugfixes (other):
25033 - Stop publishing a new server descriptor just because we get a
25034 HUP signal. This led (in a roundabout way) to some servers getting
25035 dropped from the networkstatus lists for a few hours each day.
25036 - When looking for a circuit to cannibalize, consider family as well
25037 as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
25038 circuit cannibalization).
25039 - When a router wasn't listed in a new networkstatus, we were leaving
25040 the flags for that router alone -- meaning it remained Named,
25041 Running, etc -- even though absence from the networkstatus means
25042 that it shouldn't be considered to exist at all anymore. Now we
25043 clear all the flags for routers that fall out of the networkstatus
25044 consensus. Fixes bug 529.
25047 - Don't try to access (or alter) the state file when running
25048 --list-fingerprint or --verify-config or --hash-password. Resolves
25050 - When generating information telling us how to extend to a given
25051 router, do not try to include the nickname if it is
25052 absent. Resolves bug 467.
25053 - Fix a user-triggerable segfault in expand_filename(). (There isn't
25054 a way to trigger this remotely.)
25055 - When sending a status event to the controller telling it that an
25056 OR address is reachable, set the port correctly. (Previously we
25057 were reporting the dir port.)
25058 - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
25059 command. Bugfix on 0.1.2.17.
25060 - When loading bandwidth history, do not believe any information in
25061 the future. Fixes bug 434.
25062 - When loading entry guard information, do not believe any information
25064 - When we have our clock set far in the future and generate an
25065 onion key, then re-set our clock to be correct, we should not stop
25066 the onion key from getting rotated.
25067 - On some platforms, accept() can return a broken address. Detect
25068 this more quietly, and deal accordingly. Fixes bug 483.
25069 - It's not actually an error to find a non-pending entry in the DNS
25070 cache when canceling a pending resolve. Don't log unless stuff
25071 is fishy. Resolves bug 463.
25072 - Don't reset trusted dir server list when we set a configuration
25073 option. Patch from Robert Hogan.
25076 Changes in version 0.1.2.17 - 2007-08-30
25077 Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
25078 X bundles. Vidalia 0.0.14 makes authentication required for the
25079 ControlPort in the default configuration, which addresses important
25080 security risks. Everybody who uses Vidalia (or another controller)
25083 In addition, this Tor update fixes major load balancing problems with
25084 path selection, which should speed things up a lot once many people
25087 o Major bugfixes (security):
25088 - We removed support for the old (v0) control protocol. It has been
25089 deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
25090 become more of a headache than it's worth.
25092 o Major bugfixes (load balancing):
25093 - When choosing nodes for non-guard positions, weight guards
25094 proportionally less, since they already have enough load. Patch
25096 - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
25097 will allow fast Tor servers to get more attention.
25098 - When we're upgrading from an old Tor version, forget our current
25099 guards and pick new ones according to the new weightings. These
25100 three load balancing patches could raise effective network capacity
25101 by a factor of four. Thanks to Mike Perry for measurements.
25103 o Major bugfixes (stream expiration):
25104 - Expire not-yet-successful application streams in all cases if
25105 they've been around longer than SocksTimeout. Right now there are
25106 some cases where the stream will live forever, demanding a new
25107 circuit every 15 seconds. Fixes bug 454; reported by lodger.
25109 o Minor features (controller):
25110 - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
25111 is valid before any authentication has been received. It tells
25112 a controller what kind of authentication is expected, and what
25113 protocol is spoken. Implements proposal 119.
25115 o Minor bugfixes (performance):
25116 - Save on most routerlist_assert_ok() calls in routerlist.c, thus
25117 greatly speeding up loading cached-routers from disk on startup.
25118 - Disable sentinel-based debugging for buffer code: we squashed all
25119 the bugs that this was supposed to detect a long time ago, and now
25120 its only effect is to change our buffer sizes from nice powers of
25121 two (which platform mallocs tend to like) to values slightly over
25122 powers of two (which make some platform mallocs sad).
25124 o Minor bugfixes (misc):
25125 - If exit bandwidth ever exceeds one third of total bandwidth, then
25126 use the correct formula to weight exit nodes when choosing paths.
25127 Based on patch from Mike Perry.
25128 - Choose perfectly fairly among routers when choosing by bandwidth and
25129 weighting by fraction of bandwidth provided by exits. Previously, we
25130 would choose with only approximate fairness, and correct ourselves
25131 if we ran off the end of the list.
25132 - If we require CookieAuthentication but we fail to write the
25133 cookie file, we would warn but not exit, and end up in a state
25134 where no controller could authenticate. Now we exit.
25135 - If we require CookieAuthentication, stop generating a new cookie
25136 every time we change any piece of our config.
25137 - Refuse to start with certain directory authority keys, and
25138 encourage people using them to stop.
25139 - Terminate multi-line control events properly. Original patch
25141 - Fix a minor memory leak when we fail to find enough suitable
25142 servers to choose a circuit.
25143 - Stop leaking part of the descriptor when we run into a particularly
25144 unparseable piece of it.
25147 Changes in version 0.1.2.16 - 2007-08-01
25148 Tor 0.1.2.16 fixes a critical security vulnerability that allows a
25149 remote attacker in certain situations to rewrite the user's torrc
25150 configuration file. This can completely compromise anonymity of users
25151 in most configurations, including those running the Vidalia bundles,
25152 TorK, etc. Or worse.
25154 o Major security fixes:
25155 - Close immediately after missing authentication on control port;
25156 do not allow multiple authentication attempts.
25159 Changes in version 0.1.2.15 - 2007-07-17
25160 Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
25161 problems, fixes compilation on BSD, and fixes a variety of other
25162 bugs. Everybody should upgrade.
25164 o Major bugfixes (compilation):
25165 - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
25167 o Major bugfixes (crashes):
25168 - Try even harder not to dereference the first character after
25169 an mmap(). Reported by lodger.
25170 - Fix a crash bug in directory authorities when we re-number the
25171 routerlist while inserting a new router.
25172 - When the cached-routers file is an even multiple of the page size,
25173 don't run off the end and crash. (Fixes bug 455; based on idea
25175 - Fix eventdns.c behavior on Solaris: It is critical to include
25176 orconfig.h _before_ sys/types.h, so that we can get the expected
25177 definition of _FILE_OFFSET_BITS.
25179 o Major bugfixes (security):
25180 - Fix a possible buffer overrun when using BSD natd support. Bug
25182 - When sending destroy cells from a circuit's origin, don't include
25183 the reason for tearing down the circuit. The spec says we didn't,
25184 and now we actually don't. Reported by lodger.
25185 - Keep streamids from different exits on a circuit separate. This
25186 bug may have allowed other routers on a given circuit to inject
25187 cells into streams. Reported by lodger; fixes bug 446.
25188 - If there's a never-before-connected-to guard node in our list,
25189 never choose any guards past it. This way we don't expand our
25190 guard list unless we need to.
25192 o Minor bugfixes (guard nodes):
25193 - Weight guard selection by bandwidth, so that low-bandwidth nodes
25194 don't get overused as guards.
25196 o Minor bugfixes (directory):
25197 - Correctly count the number of authorities that recommend each
25198 version. Previously, we were under-counting by 1.
25199 - Fix a potential crash bug when we load many server descriptors at
25200 once and some of them make others of them obsolete. Fixes bug 458.
25202 o Minor bugfixes (hidden services):
25203 - Stop tearing down the whole circuit when the user asks for a
25204 connection to a port that the hidden service didn't configure.
25207 o Minor bugfixes (misc):
25208 - On Windows, we were preventing other processes from reading
25209 cached-routers while Tor was running. Reported by janbar.
25210 - Fix a possible (but very unlikely) bug in picking routers by
25211 bandwidth. Add a log message to confirm that it is in fact
25212 unlikely. Patch from lodger.
25213 - Backport a couple of memory leak fixes.
25214 - Backport miscellaneous cosmetic bugfixes.
25217 Changes in version 0.1.2.14 - 2007-05-25
25218 Tor 0.1.2.14 changes the addresses of two directory authorities (this
25219 change especially affects those who serve or use hidden services),
25220 and fixes several other crash- and security-related bugs.
25222 o Directory authority changes:
25223 - Two directory authorities (moria1 and moria2) just moved to new
25224 IP addresses. This change will particularly affect those who serve
25225 or use hidden services.
25227 o Major bugfixes (crashes):
25228 - If a directory server runs out of space in the connection table
25229 as it's processing a begin_dir request, it will free the exit stream
25230 but leave it attached to the circuit, leading to unpredictable
25231 behavior. (Reported by seeess, fixes bug 425.)
25232 - Fix a bug in dirserv_remove_invalid() that would cause authorities
25233 to corrupt memory under some really unlikely scenarios.
25234 - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
25235 - Avoid segfaults when reading from mmaped descriptor file. (Reported
25238 o Major bugfixes (security):
25239 - When choosing an entry guard for a circuit, avoid using guards
25240 that are in the same family as the chosen exit -- not just guards
25241 that are exactly the chosen exit. (Reported by lodger.)
25243 o Major bugfixes (resource management):
25244 - If a directory authority is down, skip it when deciding where to get
25245 networkstatus objects or descriptors. Otherwise we keep asking
25246 every 10 seconds forever. Fixes bug 384.
25247 - Count it as a failure if we fetch a valid network-status but we
25248 don't want to keep it. Otherwise we'll keep fetching it and keep
25249 not wanting to keep it. Fixes part of bug 422.
25250 - If all of our dirservers have given us bad or no networkstatuses
25251 lately, then stop hammering them once per minute even when we
25252 think they're failed. Fixes another part of bug 422.
25255 - Actually set the purpose correctly for descriptors inserted with
25256 purpose=controller.
25257 - When we have k non-v2 authorities in our DirServer config,
25258 we ignored the last k authorities in the list when updating our
25260 - Correctly back-off from requesting router descriptors that we are
25261 having a hard time downloading.
25262 - Read resolv.conf files correctly on platforms where read() returns
25263 partial results on small file reads.
25264 - Don't rebuild the entire router store every time we get 32K of
25265 routers: rebuild it when the journal gets very large, or when
25266 the gaps in the store get very large.
25269 - When routers publish SVN revisions in their router descriptors,
25270 authorities now include those versions correctly in networkstatus
25272 - Warn when using a version of libevent before 1.3b to run a server on
25273 OSX or BSD: these versions interact badly with userspace threads.
25276 Changes in version 0.1.2.13 - 2007-04-24
25277 This release features some major anonymity fixes, such as safer path
25278 selection; better client performance; faster bootstrapping, better
25279 address detection, and better DNS support for servers; write limiting as
25280 well as read limiting to make servers easier to run; and a huge pile of
25281 other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
25283 Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
25284 of the Freenode IRC network, remembering his patience and vision for
25285 free speech on the Internet.
25287 o Major features, client performance:
25288 - Weight directory requests by advertised bandwidth. Now we can
25289 let servers enable write limiting but still allow most clients to
25290 succeed at their directory requests. (We still ignore weights when
25291 choosing a directory authority; I hope this is a feature.)
25292 - Stop overloading exit nodes -- avoid choosing them for entry or
25293 middle hops when the total bandwidth available from non-exit nodes
25294 is much higher than the total bandwidth available from exit nodes.
25295 - Rather than waiting a fixed amount of time between retrying
25296 application connections, we wait only 10 seconds for the first,
25297 10 seconds for the second, and 15 seconds for each retry after
25298 that. Hopefully this will improve the expected user experience.
25299 - Sometimes we didn't bother sending a RELAY_END cell when an attempt
25300 to open a stream fails; now we do in more cases. This should
25301 make clients able to find a good exit faster in some cases, since
25302 unhandleable requests will now get an error rather than timing out.
25304 o Major features, client functionality:
25305 - Implement BEGIN_DIR cells, so we can connect to a directory
25306 server via TLS to do encrypted directory requests rather than
25307 plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
25308 config options if you like. For now, this feature only works if
25309 you already have a descriptor for the destination dirserver.
25310 - Add support for transparent application connections: this basically
25311 bundles the functionality of trans-proxy-tor into the Tor
25312 mainline. Now hosts with compliant pf/netfilter implementations
25313 can redirect TCP connections straight to Tor without diverting
25314 through SOCKS. (Based on patch from tup.)
25315 - Add support for using natd; this allows FreeBSDs earlier than
25316 5.1.2 to have ipfw send connections through Tor without using
25317 SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
25319 o Major features, servers:
25320 - Setting up a dyndns name for your server is now optional: servers
25321 with no hostname or IP address will learn their IP address by
25322 asking the directory authorities. This code only kicks in when you
25323 would normally have exited with a "no address" error. Nothing's
25324 authenticated, so use with care.
25325 - Directory servers now spool server descriptors, v1 directories,
25326 and v2 networkstatus objects to buffers as needed rather than en
25327 masse. They also mmap the cached-routers files. These steps save
25329 - Stop requiring clients to have well-formed certificates, and stop
25330 checking nicknames in certificates. (Clients have certificates so
25331 that they can look like Tor servers, but in the future we might want
25332 to allow them to look like regular TLS clients instead. Nicknames
25333 in certificates serve no purpose other than making our protocol
25334 easier to recognize on the wire.) Implements proposal 106.
25336 o Improvements on DNS support:
25337 - Add "eventdns" asynchronous dns library originally based on code
25338 from Adam Langley. Now we can discard the old rickety dnsworker
25339 concept, and support a wider variety of DNS functions. Allows
25340 multithreaded builds on NetBSD and OpenBSD again.
25341 - Add server-side support for "reverse" DNS lookups (using PTR
25342 records so clients can determine the canonical hostname for a given
25343 IPv4 address). Only supported by servers using eventdns; servers
25344 now announce in their descriptors if they don't support eventdns.
25345 - Workaround for name servers (like Earthlink's) that hijack failing
25346 DNS requests and replace the no-such-server answer with a "helpful"
25347 redirect to an advertising-driven search portal. Also work around
25348 DNS hijackers who "helpfully" decline to hijack known-invalid
25349 RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
25350 lets you turn it off.
25351 - Servers now check for the case when common DNS requests are going to
25352 wildcarded addresses (i.e. all getting the same answer), and change
25353 their exit policy to reject *:* if it's happening.
25354 - When asked to resolve a hostname, don't use non-exit servers unless
25355 requested to do so. This allows servers with broken DNS to be
25356 useful to the network.
25357 - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
25358 useless IPv6 DNS resolves.
25359 - Specify and implement client-side SOCKS5 interface for reverse DNS
25360 lookups (see doc/socks-extensions.txt). Also cache them.
25361 - When we change nameservers or IP addresses, reset and re-launch
25362 our tests for DNS hijacking.
25364 o Improvements on reachability testing:
25365 - Servers send out a burst of long-range padding cells once they've
25366 established that they're reachable. Spread them over 4 circuits,
25367 so hopefully a few will be fast. This exercises bandwidth and
25368 bootstraps them into the directory more quickly.
25369 - When we find our DirPort to be reachable, publish a new descriptor
25370 so we'll tell the world (reported by pnx).
25371 - Directory authorities now only decide that routers are reachable
25372 if their identity keys are as expected.
25373 - Do DirPort reachability tests less often, since a single test
25374 chews through many circuits before giving up.
25375 - Avoid some false positives during reachability testing: don't try
25376 to test via a server that's on the same /24 network as us.
25377 - Start publishing one minute or so after we find our ORPort
25378 to be reachable. This will help reduce the number of descriptors
25379 we have for ourselves floating around, since it's quite likely
25380 other things (e.g. DirPort) will change during that minute too.
25381 - Routers no longer try to rebuild long-term connections to directory
25382 authorities, and directory authorities no longer try to rebuild
25383 long-term connections to all servers. We still don't hang up
25384 connections in these two cases though -- we need to look at it
25385 more carefully to avoid flapping, and we likely need to wait til
25386 0.1.1.x is obsolete.
25388 o Improvements on rate limiting:
25389 - Enable write limiting as well as read limiting. Now we sacrifice
25390 capacity if we're pushing out lots of directory traffic, rather
25391 than overrunning the user's intended bandwidth limits.
25392 - Include TLS overhead when counting bandwidth usage; previously, we
25393 would count only the bytes sent over TLS, but not the bytes used
25395 - Servers decline directory requests much more aggressively when
25396 they're low on bandwidth. Otherwise they end up queueing more and
25397 more directory responses, which can't be good for latency.
25398 - But never refuse directory requests from local addresses.
25399 - Be willing to read or write on local connections (e.g. controller
25400 connections) even when the global rate limiting buckets are empty.
25401 - Flush local controller connection buffers periodically as we're
25402 writing to them, so we avoid queueing 4+ megabytes of data before
25404 - Revise and clean up the torrc.sample that we ship with; add
25405 a section for BandwidthRate and BandwidthBurst.
25407 o Major features, NT services:
25408 - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
25409 command-line flag so that admins can override the default by saying
25410 "tor --service install --user "SomeUser"". This will not affect
25411 existing installed services. Also, warn the user that the service
25412 will look for its configuration file in the service user's
25413 %appdata% directory. (We can't do the "hardwire the user's appdata
25414 directory" trick any more, since we may not have read access to that
25416 - Support running the Tor service with a torrc not in the same
25417 directory as tor.exe and default to using the torrc located in
25418 the %appdata%\Tor\ of the user who installed the service. Patch
25420 - Add an --ignore-missing-torrc command-line option so that we can
25421 get the "use sensible defaults if the configuration file doesn't
25422 exist" behavior even when specifying a torrc location on the
25424 - When stopping an NT service, wait up to 10 sec for it to actually
25425 stop. (Patch from Matt Edman; resolves bug 295.)
25427 o Directory authority improvements:
25428 - Stop letting hibernating or obsolete servers affect uptime and
25430 - Stop listing hibernating servers in the v1 directory.
25431 - Authorities no longer recommend exits as guards if this would shift
25432 too much load to the exit nodes.
25433 - Authorities now specify server versions in networkstatus. This adds
25434 about 2% to the size of compressed networkstatus docs, and allows
25435 clients to tell which servers support BEGIN_DIR and which don't.
25436 The implementation is forward-compatible with a proposed future
25437 protocol version scheme not tied to Tor versions.
25438 - DirServer configuration lines now have an orport= option so
25439 clients can open encrypted tunnels to the authorities without
25440 having downloaded their descriptors yet. Enabled for moria1,
25441 moria2, tor26, and lefkada now in the default configuration.
25442 - Add a BadDirectory flag to network status docs so that authorities
25443 can (eventually) tell clients about caches they believe to be
25444 broken. Not used yet.
25445 - Allow authorities to list nodes as bad exits in their
25446 approved-routers file by fingerprint or by address. If most
25447 authorities set a BadExit flag for a server, clients don't think
25448 of it as a general-purpose exit. Clients only consider authorities
25449 that advertise themselves as listing bad exits.
25450 - Patch from Steve Hildrey: Generate network status correctly on
25451 non-versioning dirservers.
25452 - Have directory authorities allow larger amounts of drift in uptime
25453 without replacing the server descriptor: previously, a server that
25454 restarted every 30 minutes could have 48 "interesting" descriptors
25456 - Reserve the nickname "Unnamed" for routers that can't pick
25457 a hostname: any router can call itself Unnamed; directory
25458 authorities will never allocate Unnamed to any particular router;
25459 clients won't believe that any router is the canonical Unnamed.
25461 o Directory mirrors and clients:
25462 - Discard any v1 directory info that's over 1 month old (for
25463 directories) or over 1 week old (for running-routers lists).
25464 - Clients track responses with status 503 from dirservers. After a
25465 dirserver has given us a 503, we try not to use it until an hour has
25466 gone by, or until we have no dirservers that haven't given us a 503.
25467 - When we get a 503 from a directory, and we're not a server, we no
25468 longer count the failure against the total number of failures
25469 allowed for the object we're trying to download.
25470 - Prepare for servers to publish descriptors less often: never
25471 discard a descriptor simply for being too old until either it is
25472 recommended by no authorities, or until we get a better one for
25473 the same router. Make caches consider retaining old recommended
25474 routers for even longer.
25475 - Directory servers now provide 'Pragma: no-cache' and 'Expires'
25476 headers for content, so that we can work better in the presence of
25477 caching HTTP proxies.
25478 - Stop fetching descriptors if you're not a dir mirror and you
25479 haven't tried to establish any circuits lately. (This currently
25480 causes some dangerous behavior, because when you start up again
25481 you'll use your ancient server descriptors.)
25483 o Major fixes, crashes:
25484 - Stop crashing when the controller asks us to resetconf more than
25485 one config option at once. (Vidalia 0.0.11 does this.)
25486 - Fix a longstanding obscure crash bug that could occur when we run
25487 out of DNS worker processes, if we're not using eventdns. (Resolves
25489 - Fix an assert that could trigger if a controller quickly set then
25490 cleared EntryNodes. (Bug found by Udo van den Heuvel.)
25491 - Avoid crash when telling controller about stream-status and a
25492 stream is detached.
25493 - Avoid sending junk to controllers or segfaulting when a controller
25494 uses EVENT_NEW_DESC with verbose nicknames.
25495 - Stop triggering asserts if the controller tries to extend hidden
25496 service circuits (reported by mwenge).
25497 - If we start a server with ClientOnly 1, then set ClientOnly to 0
25498 and hup, stop triggering an assert based on an empty onion_key.
25499 - Mask out all signals in sub-threads; only the libevent signal
25500 handler should be processing them. This should prevent some crashes
25501 on some machines using pthreads. (Patch from coderman.)
25502 - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
25504 o Major fixes, anonymity/security:
25505 - Automatically avoid picking more than one node from the same
25506 /16 network when constructing a circuit. Add an
25507 "EnforceDistinctSubnets" option to let people disable it if they
25508 want to operate private test networks on a single subnet.
25509 - When generating bandwidth history, round down to the nearest
25510 1k. When storing accounting data, round up to the nearest 1k.
25511 - When we're running as a server, remember when we last rotated onion
25512 keys, so that we will rotate keys once they're a week old even if
25513 we never stay up for a week ourselves.
25514 - If a client asked for a server by name, and there's a named server
25515 in our network-status but we don't have its descriptor yet, we
25516 could return an unnamed server instead.
25517 - Reject (most) attempts to use Tor circuits with length one. (If
25518 many people start using Tor as a one-hop proxy, exit nodes become
25519 a more attractive target for compromise.)
25520 - Just because your DirPort is open doesn't mean people should be
25521 able to remotely teach you about hidden service descriptors. Now
25522 only accept rendezvous posts if you've got HSAuthoritativeDir set.
25523 - Fix a potential race condition in the rpm installer. Found by
25525 - Do not log IPs with TLS failures for incoming TLS
25526 connections. (Fixes bug 382.)
25528 o Major fixes, other:
25529 - If our system clock jumps back in time, don't publish a negative
25530 uptime in the descriptor.
25531 - When we start during an accounting interval before it's time to wake
25532 up, remember to wake up at the correct time. (May fix bug 342.)
25533 - Previously, we would cache up to 16 old networkstatus documents
25534 indefinitely, if they came from nontrusted authorities. Now we
25535 discard them if they are more than 10 days old.
25536 - When we have a state file we cannot parse, tell the user and
25537 move it aside. Now we avoid situations where the user starts
25538 Tor in 1904, Tor writes a state file with that timestamp in it,
25539 the user fixes her clock, and Tor refuses to start.
25540 - Publish a new descriptor after we hup/reload. This is important
25541 if our config has changed such that we'll want to start advertising
25542 our DirPort now, etc.
25543 - If we are using an exit enclave and we can't connect, e.g. because
25544 its webserver is misconfigured to not listen on localhost, then
25545 back off and try connecting from somewhere else before we fail.
25547 o New config options or behaviors:
25548 - When EntryNodes are configured, rebuild the guard list to contain,
25549 in order: the EntryNodes that were guards before; the rest of the
25550 EntryNodes; the nodes that were guards before.
25551 - Do not warn when individual nodes in the configuration's EntryNodes,
25552 ExitNodes, etc are down: warn only when all possible nodes
25553 are down. (Fixes bug 348.)
25554 - Put a lower-bound on MaxAdvertisedBandwidth.
25555 - Start using the state file to store bandwidth accounting data:
25556 the bw_accounting file is now obsolete. We'll keep generating it
25557 for a while for people who are still using 0.1.2.4-alpha.
25558 - Try to batch changes to the state file so that we do as few
25559 disk writes as possible while still storing important things in
25561 - The state file and the bw_accounting file get saved less often when
25562 the AvoidDiskWrites config option is set.
25563 - Make PIDFile work on Windows.
25564 - Add internal descriptions for a bunch of configuration options:
25565 accessible via controller interface and in comments in saved
25567 - Reject *:563 (NNTPS) in the default exit policy. We already reject
25568 NNTP by default, so this seems like a sensible addition.
25569 - Clients now reject hostnames with invalid characters. This should
25570 avoid some inadvertent info leaks. Add an option
25571 AllowNonRFC953Hostnames to disable this behavior, in case somebody
25572 is running a private network with hosts called @, !, and #.
25573 - Check for addresses with invalid characters at the exit as well,
25574 and warn less verbosely when they fail. You can override this by
25575 setting ServerDNSAllowNonRFC953Addresses to 1.
25576 - Remove some options that have been deprecated since at least
25577 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
25578 SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
25579 to set log options. Mark PathlenCoinWeight as obsolete.
25580 - Stop accepting certain malformed ports in configured exit policies.
25581 - When the user uses bad syntax in the Log config line, stop
25582 suggesting other bad syntax as a replacement.
25583 - Add new config option "ResolvConf" to let the server operator
25584 choose an alternate resolve.conf file when using eventdns.
25585 - If one of our entry guards is on the ExcludeNodes list, or the
25586 directory authorities don't think it's a good guard, treat it as
25587 if it were unlisted: stop using it as a guard, and throw it off
25588 the guards list if it stays that way for a long time.
25589 - Allow directory authorities to be marked separately as authorities
25590 for the v1 directory protocol, the v2 directory protocol, and
25591 as hidden service directories, to make it easier to retire old
25592 authorities. V1 authorities should set "HSAuthoritativeDir 1"
25593 to continue being hidden service authorities too.
25594 - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
25595 - Make TrackExitHosts case-insensitive, and fix the behavior of
25596 ".suffix" TrackExitHosts items to avoid matching in the middle of
25598 - New DirPort behavior: if you have your dirport set, you download
25599 descriptors aggressively like a directory mirror, whether or not
25600 your ORPort is set.
25603 - Create a new file ReleaseNotes which was the old ChangeLog. The
25604 new ChangeLog file now includes the notes for all development
25606 - Add a new address-spec.txt document to describe our special-case
25607 addresses: .exit, .onion, and .noconnnect.
25608 - Fork the v1 directory protocol into its own spec document,
25609 and mark dir-spec.txt as the currently correct (v2) spec.
25611 o Packaging, porting, and contrib
25612 - "tor --verify-config" now exits with -1(255) or 0 depending on
25613 whether the config options are bad or good.
25614 - The Debian package now uses --verify-config when (re)starting,
25615 to distinguish configuration errors from other errors.
25616 - Adapt a patch from goodell to let the contrib/exitlist script
25617 take arguments rather than require direct editing.
25618 - Prevent the contrib/exitlist script from printing the same
25619 result more than once.
25620 - Add support to tor-resolve tool for reverse lookups and SOCKS5.
25621 - In the hidden service example in torrc.sample, stop recommending
25622 esoteric and discouraged hidden service options.
25623 - Patch from Michael Mohr to contrib/cross.sh, so it checks more
25624 values before failing, and always enables eventdns.
25625 - Try to detect Windows correctly when cross-compiling.
25626 - Libevent-1.2 exports, but does not define in its headers, strlcpy.
25627 Try to fix this in configure.in by checking for most functions
25628 before we check for libevent.
25629 - Update RPMs to require libevent 1.2.
25630 - Experimentally re-enable kqueue on OSX when using libevent 1.1b
25631 or later. Log when we are doing this, so we can diagnose it when
25632 it fails. (Also, recommend libevent 1.1b for kqueue and
25633 win32 methods; deprecate libevent 1.0b harder; make libevent
25634 recommendation system saner.)
25635 - Build with recent (1.3+) libevents on platforms that do not
25636 define the nonstandard types "u_int8_t" and friends.
25637 - Remove architecture from OS X builds. The official builds are
25638 now universal binaries.
25639 - Run correctly on OS X platforms with case-sensitive filesystems.
25640 - Correctly set maximum connection limit on Cygwin. (This time
25642 - Start compiling on MinGW on Windows (patches from Mike Chiussi
25644 - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
25645 - Finally fix the openssl warnings from newer gccs that believe that
25646 ignoring a return value is okay, but casting a return value and
25647 then ignoring it is a sign of madness.
25648 - On architectures where sizeof(int)>4, still clamp declarable
25649 bandwidth to INT32_MAX.
25651 o Minor features, controller:
25652 - Warn the user when an application uses the obsolete binary v0
25653 control protocol. We're planning to remove support for it during
25654 the next development series, so it's good to give people some
25656 - Add STREAM_BW events to report per-entry-stream bandwidth
25657 use. (Patch from Robert Hogan.)
25658 - Rate-limit SIGNEWNYM signals in response to controllers that
25659 impolitely generate them for every single stream. (Patch from
25660 mwenge; closes bug 394.)
25661 - Add a REMAP status to stream events to note that a stream's
25662 address has changed because of a cached address or a MapAddress
25664 - Make REMAP stream events have a SOURCE (cache or exit), and
25665 make them generated in every case where we get a successful
25666 connected or resolved cell.
25667 - Track reasons for OR connection failure; make these reasons
25668 available via the controller interface. (Patch from Mike Perry.)
25669 - Add a SOCKS_BAD_HOSTNAME client status event so controllers
25670 can learn when clients are sending malformed hostnames to Tor.
25671 - Specify and implement some of the controller status events.
25672 - Have GETINFO dir/status/* work on hosts with DirPort disabled.
25673 - Reimplement GETINFO so that info/names stays in sync with the
25675 - Implement "GETINFO fingerprint".
25676 - Implement "SETEVENTS GUARD" so controllers can get updates on
25677 entry guard status as it changes.
25678 - Make all connections to addresses of the form ".noconnect"
25679 immediately get closed. This lets application/controller combos
25680 successfully test whether they're talking to the same Tor by
25681 watching for STREAM events.
25682 - Add a REASON field to CIRC events; for backward compatibility, this
25683 field is sent only to controllers that have enabled the extended
25684 event format. Also, add additional reason codes to explain why
25685 a given circuit has been destroyed or truncated. (Patches from
25687 - Add a REMOTE_REASON field to extended CIRC events to tell the
25688 controller why a remote OR told us to close a circuit.
25689 - Stream events also now have REASON and REMOTE_REASON fields,
25690 working much like those for circuit events.
25691 - There's now a GETINFO ns/... field so that controllers can ask Tor
25692 about the current status of a router.
25693 - A new event type "NS" to inform a controller when our opinion of
25694 a router's status has changed.
25695 - Add a GETINFO events/names and GETINFO features/names so controllers
25696 can tell which events and features are supported.
25697 - A new CLEARDNSCACHE signal to allow controllers to clear the
25698 client-side DNS cache without expiring circuits.
25699 - Fix CIRC controller events so that controllers can learn the
25700 identity digests of non-Named servers used in circuit paths.
25701 - Let controllers ask for more useful identifiers for servers. Instead
25702 of learning identity digests for un-Named servers and nicknames
25703 for Named servers, the new identifiers include digest, nickname,
25704 and indication of Named status. Off by default; see control-spec.txt
25705 for more information.
25706 - Add a "getinfo address" controller command so it can display Tor's
25707 best guess to the user.
25708 - New controller event to alert the controller when our server
25709 descriptor has changed.
25710 - Give more meaningful errors on controller authentication failure.
25711 - Export the default exit policy via the control port, so controllers
25712 don't need to guess what it is / will be later.
25714 o Minor bugfixes, controller:
25715 - When creating a circuit via the controller, send a 'launched'
25716 event when we're done, so we follow the spec better.
25717 - Correct the control spec to match how the code actually responds
25718 to 'getinfo addr-mappings/*'. Reported by daejees.
25719 - The control spec described a GUARDS event, but the code
25720 implemented a GUARD event. Standardize on GUARD, but let people
25721 ask for GUARDS too. Reported by daejees.
25722 - Give the controller END_STREAM_REASON_DESTROY events _before_ we
25723 clear the corresponding on_circuit variable, and remember later
25724 that we don't need to send a redundant CLOSED event. (Resolves part
25726 - Report events where a resolve succeeded or where we got a socks
25727 protocol error correctly, rather than calling both of them
25729 - Change reported stream target addresses to IP consistently when
25730 we finally get the IP from an exit node.
25731 - Send log messages to the controller even if they happen to be very
25733 - Flush ERR-level controller status events just like we currently
25734 flush ERR-level log events, so that a Tor shutdown doesn't prevent
25735 the controller from learning about current events.
25736 - Report the circuit number correctly in STREAM CLOSED events. Bug
25737 reported by Mike Perry.
25738 - Do not report bizarre values for results of accounting GETINFOs
25739 when the last second's write or read exceeds the allotted bandwidth.
25740 - Report "unrecognized key" rather than an empty string when the
25741 controller tries to fetch a networkstatus that doesn't exist.
25742 - When the controller does a "GETINFO network-status", tell it
25743 about even those routers whose descriptors are very old, and use
25744 long nicknames where appropriate.
25745 - Fix handling of verbose nicknames with ORCONN controller events:
25746 make them show up exactly when requested, rather than exactly when
25748 - Controller signals now work on non-Unix platforms that don't define
25749 SIGUSR1 and SIGUSR2 the way we expect.
25750 - Respond to SIGNAL command before we execute the signal, in case
25751 the signal shuts us down. Suggested by Karsten Loesing.
25752 - Handle reporting OR_CONN_EVENT_NEW events to the controller.
25754 o Minor features, code performance:
25755 - Major performance improvement on inserting descriptors: change
25756 algorithm from O(n^2) to O(n).
25757 - Do not rotate onion key immediately after setting it for the first
25759 - Call router_have_min_dir_info half as often. (This is showing up in
25760 some profiles, but not others.)
25761 - When using GCC, make log_debug never get called at all, and its
25762 arguments never get evaluated, when no debug logs are configured.
25763 (This is showing up in some profiles, but not others.)
25764 - Statistics dumped by -USR2 now include a breakdown of public key
25765 operations, for profiling.
25766 - Make the common memory allocation path faster on machines where
25767 malloc(0) returns a pointer.
25768 - Split circuit_t into origin_circuit_t and or_circuit_t, and
25769 split connection_t into edge, or, dir, control, and base structs.
25770 These will save quite a bit of memory on busy servers, and they'll
25771 also help us track down bugs in the code and bugs in the spec.
25772 - Use OpenSSL's AES implementation on platforms where it's faster.
25773 This could save us as much as 10% CPU usage.
25775 o Minor features, descriptors and descriptor handling:
25776 - Avoid duplicate entries on MyFamily line in server descriptor.
25777 - When Tor receives a router descriptor that it asked for, but
25778 no longer wants (because it has received fresh networkstatuses
25779 in the meantime), do not warn the user. Cache the descriptor if
25780 we're a cache; drop it if we aren't.
25781 - Servers no longer ever list themselves in their "family" line,
25782 even if configured to do so. This makes it easier to configure
25783 family lists conveniently.
25785 o Minor fixes, confusing/misleading log messages:
25786 - Display correct results when reporting which versions are
25787 recommended, and how recommended they are. (Resolves bug 383.)
25788 - Inform the server operator when we decide not to advertise a
25789 DirPort due to AccountingMax enabled or a low BandwidthRate.
25790 - Only include function names in log messages for info/debug messages.
25791 For notice/warn/err, the content of the message should be clear on
25792 its own, and printing the function name only confuses users.
25793 - Remove even more protocol-related warnings from Tor server logs,
25794 such as bad TLS handshakes and malformed begin cells.
25795 - Fix bug 314: Tor clients issued "unsafe socks" warnings even
25796 when the IP address is mapped through MapAddress to a hostname.
25797 - Fix misleading log messages: an entry guard that is "unlisted",
25798 as well as not known to be "down" (because we've never heard
25799 of it), is not therefore "up".
25801 o Minor fixes, old/obsolete behavior:
25802 - Start assuming we can use a create_fast cell if we don't know
25803 what version a router is running.
25804 - We no longer look for identity and onion keys in "identity.key" and
25805 "onion.key" -- these were replaced by secret_id_key and
25806 secret_onion_key in 0.0.8pre1.
25807 - We no longer require unrecognized directory entries to be
25809 - Drop compatibility with obsolete Tors that permit create cells
25810 to have the wrong circ_id_type.
25811 - Remove code to special-case "-cvs" ending, since it has not
25812 actually mattered since 0.0.9.
25813 - Don't re-write the fingerprint file every restart, unless it has
25816 o Minor fixes, misc client-side behavior:
25817 - Always remove expired routers and networkstatus docs before checking
25818 whether we have enough information to build circuits. (Fixes
25820 - When computing clock skew from directory HTTP headers, consider what
25821 time it was when we finished asking for the directory, not what
25823 - Make our socks5 handling more robust to broken socks clients:
25824 throw out everything waiting on the buffer in between socks
25825 handshake phases, since they can't possibly (so the theory
25826 goes) have predicted what we plan to respond to them.
25827 - Expire socks connections if they spend too long waiting for the
25828 handshake to finish. Previously we would let them sit around for
25829 days, if the connecting application didn't close them either.
25830 - And if the socks handshake hasn't started, don't send a
25831 "DNS resolve socks failed" handshake reply; just close it.
25832 - If the user asks to use invalid exit nodes, be willing to use
25834 - Track unreachable entry guards correctly: don't conflate
25835 'unreachable by us right now' with 'listed as down by the directory
25836 authorities'. With the old code, if a guard was unreachable by us
25837 but listed as running, it would clog our guard list forever.
25838 - Behave correctly in case we ever have a network with more than
25839 2GB/s total advertised capacity.
25840 - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
25841 - Fix a memory leak when we ask for "all" networkstatuses and we
25842 get one we don't recognize.
25845 Changes in version 0.1.1.26 - 2006-12-14
25846 o Security bugfixes:
25847 - Stop sending the HttpProxyAuthenticator string to directory
25848 servers when directory connections are tunnelled through Tor.
25849 - Clients no longer store bandwidth history in the state file.
25850 - Do not log introduction points for hidden services if SafeLogging
25854 - Fix an assert failure when a directory authority sets
25855 AuthDirRejectUnlisted and then receives a descriptor from an
25856 unlisted router (reported by seeess).
25859 Changes in version 0.1.1.25 - 2006-11-04
25861 - When a client asks us to resolve (rather than connect to)
25862 an address, and we have a cached answer, give them the cached
25863 answer. Previously, we would give them no answer at all.
25864 - We were building exactly the wrong circuits when we predict
25865 hidden service requirements, meaning Tor would have to build all
25866 its circuits on demand.
25867 - If none of our live entry guards have a high uptime, but we
25868 require a guard with a high uptime, try adding a new guard before
25869 we give up on the requirement. This patch should make long-lived
25870 connections more stable on average.
25871 - When testing reachability of our DirPort, don't launch new
25872 tests when there's already one in progress -- unreachable
25873 servers were stacking up dozens of testing streams.
25875 o Security bugfixes:
25876 - When the user sends a NEWNYM signal, clear the client-side DNS
25877 cache too. Otherwise we continue to act on previous information.
25880 - Avoid a memory corruption bug when creating a hash table for
25882 - Avoid possibility of controller-triggered crash when misusing
25883 certain commands from a v0 controller on platforms that do not
25884 handle printf("%s",NULL) gracefully.
25885 - Avoid infinite loop on unexpected controller input.
25886 - Don't log spurious warnings when we see a circuit close reason we
25887 don't recognize; it's probably just from a newer version of Tor.
25888 - Add Vidalia to the OS X uninstaller script, so when we uninstall
25889 Tor/Privoxy we also uninstall Vidalia.
25892 Changes in version 0.1.1.24 - 2006-09-29
25894 - Allow really slow clients to not hang up five minutes into their
25895 directory downloads (suggested by Adam J. Richter).
25896 - Fix major performance regression from 0.1.0.x: instead of checking
25897 whether we have enough directory information every time we want to
25898 do something, only check when the directory information has changed.
25899 This should improve client CPU usage by 25-50%.
25900 - Don't crash if, after a server has been running for a while,
25901 it can't resolve its hostname.
25902 - When a client asks us to resolve (not connect to) an address,
25903 and we have a cached answer, give them the cached answer.
25904 Previously, we would give them no answer at all.
25907 - Allow Tor to start when RunAsDaemon is set but no logs are set.
25908 - Don't crash when the controller receives a third argument to an
25909 "extendcircuit" request.
25910 - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
25911 response; fix error code when "getinfo dir/status/" fails.
25912 - Fix configure.in to not produce broken configure files with
25913 more recent versions of autoconf. Thanks to Clint for his auto*
25915 - Fix security bug on NetBSD that could allow someone to force
25916 uninitialized RAM to be sent to a server's DNS resolver. This
25917 only affects NetBSD and other platforms that do not bounds-check
25919 - Warn user when using libevent 1.1a or earlier with win32 or kqueue
25920 methods: these are known to be buggy.
25921 - If we're a directory mirror and we ask for "all" network status
25922 documents, we would discard status documents from authorities
25923 we don't recognize.
25926 Changes in version 0.1.1.23 - 2006-07-30
25928 - Fast Tor servers, especially exit nodes, were triggering asserts
25929 due to a bug in handling the list of pending DNS resolves. Some
25930 bugs still remain here; we're hunting them.
25931 - Entry guards could crash clients by sending unexpected input.
25932 - More fixes on reachability testing: if you find yourself reachable,
25933 then don't ever make any client requests (so you stop predicting
25934 circuits), then hup or have your clock jump, then later your IP
25935 changes, you won't think circuits are working, so you won't try to
25936 test reachability, so you won't publish.
25939 - Avoid a crash if the controller does a resetconf firewallports
25940 and then a setconf fascistfirewall=1.
25941 - Avoid an integer underflow when the dir authority decides whether
25942 a router is stable: we might wrongly label it stable, and compute
25943 a slightly wrong median stability, when a descriptor is published
25945 - Fix a place where we might trigger an assert if we can't build our
25946 own server descriptor yet.
25949 Changes in version 0.1.1.22 - 2006-07-05
25951 - Fix a big bug that was causing servers to not find themselves
25952 reachable if they changed IP addresses. Since only 0.1.1.22+
25953 servers can do reachability testing correctly, now we automatically
25954 make sure to test via one of these.
25955 - Fix to allow clients and mirrors to learn directory info from
25956 descriptor downloads that get cut off partway through.
25957 - Directory authorities had a bug in deciding if a newly published
25958 descriptor was novel enough to make everybody want a copy -- a few
25959 servers seem to be publishing new descriptors many times a minute.
25961 - Fix a rare bug that was causing some servers to complain about
25962 "closing wedged cpuworkers" and skip some circuit create requests.
25963 - Make the Exit flag in directory status documents actually work.
25966 Changes in version 0.1.1.21 - 2006-06-10
25967 o Crash and assert fixes from 0.1.1.20:
25968 - Fix a rare crash on Tor servers that have enabled hibernation.
25969 - Fix a seg fault on startup for Tor networks that use only one
25970 directory authority.
25971 - Fix an assert from a race condition that occurs on Tor servers
25972 while exiting, where various threads are trying to log that they're
25973 exiting, and delete the logs, at the same time.
25974 - Make our unit tests pass again on certain obscure platforms.
25977 - Add support for building SUSE RPM packages.
25978 - Speed up initial bootstrapping for clients: if we are making our
25979 first ever connection to any entry guard, then don't mark it down
25981 - When only one Tor server in the network is labelled as a guard,
25982 and we've already picked him, we would cycle endlessly picking him
25983 again, being unhappy about it, etc. Now we specifically exclude
25984 current guards when picking a new guard.
25985 - Servers send create cells more reliably after the TLS connection
25986 is established: we were sometimes forgetting to send half of them
25987 when we had more than one pending.
25988 - If we get a create cell that asks us to extend somewhere, but the
25989 Tor server there doesn't match the expected digest, we now send
25990 a destroy cell back, rather than silently doing nothing.
25991 - Make options->RedirectExit work again.
25992 - Make cookie authentication for the controller work again.
25993 - Stop being picky about unusual characters in the arguments to
25994 mapaddress. It's none of our business.
25995 - Add a new config option "TestVia" that lets you specify preferred
25996 middle hops to use for test circuits. Perhaps this will let me
25997 debug the reachability problems better.
25999 o Log / documentation fixes:
26000 - If we're a server and some peer has a broken TLS certificate, don't
26001 log about it unless ProtocolWarnings is set, i.e., we want to hear
26002 about protocol violations by others.
26003 - Fix spelling of VirtualAddrNetwork in man page.
26004 - Add a better explanation at the top of the autogenerated torrc file
26005 about what happened to our old torrc.
26008 Changes in version 0.1.1.20 - 2006-05-23
26009 o Crash and assert fixes from 0.1.0.17:
26010 - Fix assert bug in close_logs() on exit: when we close and delete
26011 logs, remove them all from the global "logfiles" list.
26012 - Fix an assert error when we're out of space in the connection_list
26013 and we try to post a hidden service descriptor (reported by Peter
26015 - Fix a rare assert error when we've tried all intro points for
26016 a hidden service and we try fetching the service descriptor again:
26017 "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
26018 - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
26019 out and refuse the setconf if it would fail.
26020 - If you specify a relative torrc path and you set RunAsDaemon in
26021 your torrc, then it chdir()'s to the new directory. If you then
26022 HUP, it tries to load the new torrc location, fails, and exits.
26023 The fix: no longer allow a relative path to torrc when using -f.
26024 - Check for integer overflows in more places, when adding elements
26025 to smartlists. This could possibly prevent a buffer overflow
26026 on malicious huge inputs.
26028 o Security fixes, major:
26029 - When we're printing strings from the network, don't try to print
26030 non-printable characters. Now we're safer against shell escape
26031 sequence exploits, and also against attacks to fool users into
26032 misreading their logs.
26033 - Implement entry guards: automatically choose a handful of entry
26034 nodes and stick with them for all circuits. Only pick new guards
26035 when the ones you have are unsuitable, and if the old guards
26036 become suitable again, switch back. This will increase security
26037 dramatically against certain end-point attacks. The EntryNodes
26038 config option now provides some hints about which entry guards you
26039 want to use most; and StrictEntryNodes means to only use those.
26040 Fixes CVE-2006-0414.
26041 - Implement exit enclaves: if we know an IP address for the
26042 destination, and there's a running Tor server at that address
26043 which allows exit to the destination, then extend the circuit to
26044 that exit first. This provides end-to-end encryption and end-to-end
26045 authentication. Also, if the user wants a .exit address or enclave,
26046 use 4 hops rather than 3, and cannibalize a general circ for it
26048 - Obey our firewall options more faithfully:
26049 . If we can't get to a dirserver directly, try going via Tor.
26050 . Don't ever try to connect (as a client) to a place our
26051 firewall options forbid.
26052 . If we specify a proxy and also firewall options, obey the
26053 firewall options even when we're using the proxy: some proxies
26054 can only proxy to certain destinations.
26055 - Make clients regenerate their keys when their IP address changes.
26056 - For the OS X package's modified privoxy config file, comment
26057 out the "logfile" line so we don't log everything passed
26059 - Our TLS handshakes were generating a single public/private
26060 keypair for the TLS context, rather than making a new one for
26061 each new connection. Oops. (But we were still rotating them
26062 periodically, so it's not so bad.)
26063 - When we were cannibalizing a circuit with a particular exit
26064 node in mind, we weren't checking to see if that exit node was
26065 already present earlier in the circuit. Now we are.
26066 - Require server descriptors to list IPv4 addresses -- hostnames
26067 are no longer allowed. This also fixes potential vulnerabilities
26068 to servers providing hostnames as their address and then
26069 preferentially resolving them so they can partition users.
26070 - Our logic to decide if the OR we connected to was the right guy
26071 was brittle and maybe open to a mitm for invalid routers.
26073 o Security fixes, minor:
26074 - Adjust tor-spec.txt to parameterize cell and key lengths. Now
26075 Ian Goldberg can prove things about our handshake protocol more
26077 - Make directory authorities generate a separate "guard" flag to
26078 mean "would make a good entry guard". Clients now honor the
26079 is_guard flag rather than looking at is_fast or is_stable.
26080 - Try to list MyFamily elements by key, not by nickname, and warn
26081 if we've not heard of a server.
26082 - Start using RAND_bytes rather than RAND_pseudo_bytes from
26083 OpenSSL. Also, reseed our entropy every hour, not just at
26084 startup. And add entropy in 512-bit chunks, not 160-bit chunks.
26085 - Refuse server descriptors where the fingerprint line doesn't match
26086 the included identity key. Tor doesn't care, but other apps (and
26087 humans) might actually be trusting the fingerprint line.
26088 - We used to kill the circuit when we receive a relay command we
26089 don't recognize. Now we just drop that cell.
26090 - Fix a bug found by Lasse Overlier: when we were making internal
26091 circuits (intended to be cannibalized later for rendezvous and
26092 introduction circuits), we were picking them so that they had
26093 useful exit nodes. There was no need for this, and it actually
26094 aids some statistical attacks.
26095 - Start treating internal circuits and exit circuits separately.
26096 It's important to keep them separate because internal circuits
26097 have their last hops picked like middle hops, rather than like
26098 exit hops. So exiting on them will break the user's expectations.
26099 - Fix a possible way to DoS dirservers.
26100 - When the client asked for a rendezvous port that the hidden
26101 service didn't want to provide, we were sending an IP address
26102 back along with the end cell. Fortunately, it was zero. But stop
26105 o Packaging improvements:
26106 - Implement --with-libevent-dir option to ./configure. Improve
26107 search techniques to find libevent, and use those for openssl too.
26108 - Fix a couple of bugs in OpenSSL detection. Deal better when
26109 there are multiple SSLs installed with different versions.
26110 - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
26111 - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
26113 - Make unit tests (and other invocations that aren't the real Tor)
26114 run without launching listeners, creating subdirectories, and so on.
26115 - The OS X installer was adding a symlink for tor_resolve but
26116 the binary was called tor-resolve (reported by Thomas Hardly).
26117 - Now we can target arch and OS in rpm builds (contributed by
26118 Phobos). Also make the resulting dist-rpm filename match the
26120 - Apply Matt Ghali's --with-syslog-facility patch to ./configure
26121 if you log to syslog and want something other than LOG_DAEMON.
26122 - Fix the torify (tsocks) config file to not use Tor for localhost
26124 - Start shipping socks-extensions.txt, tor-doc-unix.html,
26125 tor-doc-server.html, and stylesheet.css in the tarball.
26126 - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
26127 They are useless now.
26128 - Add Peter Palfrader's contributed check-tor script. It lets you
26129 easily check whether a given server (referenced by nickname)
26130 is reachable by you.
26131 - Add BSD-style contributed startup script "rc.subr" from Peter
26134 o Directory improvements -- new directory protocol:
26135 - See tor/doc/dir-spec.txt for all the juicy details. Key points:
26136 - Authorities and caches publish individual descriptors (by
26137 digest, by fingerprint, by "all", and by "tell me yours").
26138 - Clients don't download or use the old directory anymore. Now they
26139 download network-statuses from the directory authorities, and
26140 fetch individual server descriptors as needed from mirrors.
26141 - Clients don't download descriptors of non-running servers.
26142 - Download descriptors by digest, not by fingerprint. Caches try to
26143 download all listed digests from authorities; clients try to
26144 download "best" digests from caches. This avoids partitioning
26145 and isolating attacks better.
26146 - Only upload a new server descriptor when options change, 18
26147 hours have passed, uptime is reset, or bandwidth changes a lot.
26148 - Directory authorities silently throw away new descriptors that
26149 haven't changed much if the timestamps are similar. We do this to
26150 tolerate older Tor servers that upload a new descriptor every 15
26151 minutes. (It seemed like a good idea at the time.)
26152 - Clients choose directory servers from the network status lists,
26153 not from their internal list of router descriptors. Now they can
26154 go to caches directly rather than needing to go to authorities
26155 to bootstrap the first set of descriptors.
26156 - When picking a random directory, prefer non-authorities if any
26158 - Add a new flag to network-status indicating whether the server
26159 can answer v2 directory requests too.
26160 - Directory mirrors now cache up to 16 unrecognized network-status
26161 docs, so new directory authorities will be cached too.
26162 - Stop parsing, storing, or using running-routers output (but
26163 mirrors still cache and serve it).
26164 - Clients consider a threshold of "versioning" directory authorities
26165 before deciding whether to warn the user that he's obsolete.
26166 - Authorities publish separate sorted lists of recommended versions
26167 for clients and for servers.
26168 - Change DirServers config line to note which dirs are v1 authorities.
26169 - Put nicknames on the DirServer line, so we can refer to them
26170 without requiring all our users to memorize their IP addresses.
26171 - Remove option when getting directory cache to see whether they
26172 support running-routers; they all do now. Replace it with one
26173 to see whether caches support v2 stuff.
26174 - Stop listing down or invalid nodes in the v1 directory. This
26175 reduces its bulk by about 1/3, and reduces load on mirrors.
26176 - Mirrors no longer cache the v1 directory as often.
26177 - If we as a directory mirror don't know of any v1 directory
26178 authorities, then don't try to cache any v1 directories.
26180 o Other directory improvements:
26181 - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
26182 fifth authoritative directory servers.
26183 - Directory authorities no longer require an open connection from
26184 a server to consider him "reachable". We need this change because
26185 when we add new directory authorities, old servers won't know not
26186 to hang up on them.
26187 - Dir authorities now do their own external reachability testing
26188 of each server, and only list as running the ones they found to
26189 be reachable. We also send back warnings to the server's logs if
26190 it uploads a descriptor that we already believe is unreachable.
26191 - Spread the directory authorities' reachability testing over the
26192 entire testing interval, so we don't try to do 500 TLS's at once
26194 - Make the "stable" router flag in network-status be the median of
26195 the uptimes of running valid servers, and make clients pay
26196 attention to the network-status flags. Thus the cutoff adapts
26197 to the stability of the network as a whole, making IRC, IM, etc
26198 connections more reliable.
26199 - Make the v2 dir's "Fast" flag based on relative capacity, just
26200 like "Stable" is based on median uptime. Name everything in the
26201 top 7/8 Fast, and only the top 1/2 gets to be a Guard.
26202 - Retry directory requests if we fail to get an answer we like
26203 from a given dirserver (we were retrying before, but only if
26204 we fail to connect).
26205 - Return a robots.txt on our dirport to discourage google indexing.
26207 o Controller protocol improvements:
26208 - Revised controller protocol (version 1) that uses ascii rather
26209 than binary: tor/doc/control-spec.txt. Add supporting libraries
26210 in python and java and c# so you can use the controller from your
26211 applications without caring how our protocol works.
26212 - Allow the DEBUG controller event to work again. Mark certain log
26213 entries as "don't tell this to controllers", so we avoid cycles.
26214 - New controller function "getinfo accounting", to ask how
26215 many bytes we've used in this time period.
26216 - Add a "resetconf" command so you can set config options like
26217 AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
26218 a config option in the torrc with no value, then it clears it
26219 entirely (rather than setting it to its default).
26220 - Add a "getinfo config-file" to tell us where torrc is. Also
26221 expose guard nodes, config options/names.
26222 - Add a "quit" command (when when using the controller manually).
26223 - Add a new signal "newnym" to "change pseudonyms" -- that is, to
26224 stop using any currently-dirty circuits for new streams, so we
26225 don't link new actions to old actions. This also occurs on HUP
26226 or "signal reload".
26227 - If we would close a stream early (e.g. it asks for a .exit that
26228 we know would refuse it) but the LeaveStreamsUnattached config
26229 option is set by the controller, then don't close it.
26230 - Add a new controller event type "authdir_newdescs" that allows
26231 controllers to get all server descriptors that were uploaded to
26232 a router in its role as directory authority.
26233 - New controller option "getinfo desc/all-recent" to fetch the
26234 latest server descriptor for every router that Tor knows about.
26235 - Fix the controller's "attachstream 0" command to treat conn like
26236 it just connected, doing address remapping, handling .exit and
26237 .onion idioms, and so on. Now we're more uniform in making sure
26238 that the controller hears about new and closing connections.
26239 - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
26240 the controller. Also, rotate dns and cpu workers if the controller
26241 changes options that will affect them; and initialize the dns
26242 worker cache tree whether or not we start out as a server.
26243 - Add a new circuit purpose 'controller' to let the controller ask
26244 for a circuit that Tor won't try to use. Extend the "extendcircuit"
26245 controller command to let you specify the purpose if you're starting
26246 a new circuit. Add a new "setcircuitpurpose" controller command to
26247 let you change a circuit's purpose after it's been created.
26248 - Let the controller ask for "getinfo dir/server/foo" so it can ask
26249 directly rather than connecting to the dir port. "getinfo
26250 dir/status/foo" also works, but currently only if your DirPort
26252 - Let the controller tell us about certain router descriptors
26253 that it doesn't want Tor to use in circuits. Implement
26254 "setrouterpurpose" and modify "+postdescriptor" to do this.
26255 - If the controller's *setconf commands fail, collect an error
26256 message in a string and hand it back to the controller -- don't
26257 just tell them to go read their logs.
26259 o Scalability, resource management, and performance:
26260 - Fix a major load balance bug: we were round-robin reading in 16 KB
26261 chunks, and servers with bandwidthrate of 20 KB, while downloading
26262 a 600 KB directory, would starve their other connections. Now we
26263 try to be a bit more fair.
26264 - Be more conservative about whether to advertise our DirPort.
26265 The main change is to not advertise if we're running at capacity
26266 and either a) we could hibernate ever or b) our capacity is low
26267 and we're using a default DirPort.
26268 - We weren't cannibalizing circuits correctly for
26269 CIRCUIT_PURPOSE_C_ESTABLISH_REND and
26270 CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
26271 build those from scratch. This should make hidden services faster.
26272 - Predict required circuits better, with an eye toward making hidden
26273 services faster on the service end.
26274 - Compress exit policies even more: look for duplicate lines and
26276 - Generate 18.0.0.0/8 address policy format in descs when we can;
26277 warn when the mask is not reducible to a bit-prefix.
26278 - There used to be two ways to specify your listening ports in a
26279 server descriptor: on the "router" line and with a separate "ports"
26280 line. Remove support for the "ports" line.
26281 - Reduce memory requirements in our structs by changing the order
26282 of fields. Replace balanced trees with hash tables. Inline
26283 bottleneck smartlist functions. Add a "Map from digest to void*"
26284 abstraction so we can do less hex encoding/decoding, and use it
26285 in router_get_by_digest(). Many other CPU and memory improvements.
26286 - Allow tor_gzip_uncompress to extract as much as possible from
26287 truncated compressed data. Try to extract as many
26288 descriptors as possible from truncated http responses (when
26289 purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
26290 - Make circ->onionskin a pointer, not a static array. moria2 was using
26291 125000 circuit_t's after it had been up for a few weeks, which
26292 translates to 20+ megs of wasted space.
26293 - The private half of our EDH handshake keys are now chosen out
26294 of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
26295 - Stop doing the complex voodoo overkill checking for insecure
26296 Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
26297 - Do round-robin writes for TLS of at most 16 kB per write. This
26298 might be more fair on loaded Tor servers.
26299 - Do not use unaligned memory access on alpha, mips, or mipsel.
26300 It *works*, but is very slow, so we treat them as if it doesn't.
26302 o Other bugfixes and improvements:
26303 - Start storing useful information to $DATADIR/state, so we can
26304 remember things across invocations of Tor. Retain unrecognized
26305 lines so we can be forward-compatible, and write a TorVersion line
26306 so we can be backward-compatible.
26307 - If ORPort is set, Address is not explicitly set, and our hostname
26308 resolves to a private IP address, try to use an interface address
26309 if it has a public address. Now Windows machines that think of
26310 themselves as localhost can guess their address.
26311 - Regenerate our local descriptor if it's dirty and we try to use
26312 it locally (e.g. if it changes during reachability detection).
26313 This was causing some Tor servers to keep publishing the same
26314 initial descriptor forever.
26315 - Tor servers with dynamic IP addresses were needing to wait 18
26316 hours before they could start doing reachability testing using
26317 the new IP address and ports. This is because they were using
26318 the internal descriptor to learn what to test, yet they were only
26319 rebuilding the descriptor once they decided they were reachable.
26320 - It turns out we couldn't bootstrap a network since we added
26321 reachability detection in 0.1.0.1-rc. Good thing the Tor network
26322 has never gone down. Add an AssumeReachable config option to let
26323 servers and authorities bootstrap. When we're trying to build a
26324 high-uptime or high-bandwidth circuit but there aren't enough
26325 suitable servers, try being less picky rather than simply failing.
26326 - Newly bootstrapped Tor networks couldn't establish hidden service
26327 circuits until they had nodes with high uptime. Be more tolerant.
26328 - Really busy servers were keeping enough circuits open on stable
26329 connections that they were wrapping around the circuit_id
26330 space. (It's only two bytes.) This exposed a bug where we would
26331 feel free to reuse a circuit_id even if it still exists but has
26332 been marked for close. Try to fix this bug. Some bug remains.
26333 - When we fail to bind or listen on an incoming or outgoing
26334 socket, we now close it before refusing, rather than just
26335 leaking it. (Thanks to Peter Palfrader for finding.)
26336 - Fix a file descriptor leak in start_daemon().
26337 - On Windows, you can't always reopen a port right after you've
26338 closed it. So change retry_listeners() to only close and re-open
26339 ports that have changed.
26340 - Workaround a problem with some http proxies that refuse GET
26341 requests that specify "Content-Length: 0". Reported by Adrian.
26342 - Recover better from TCP connections to Tor servers that are
26343 broken but don't tell you (it happens!); and rotate TLS
26344 connections once a week.
26345 - Fix a scary-looking but apparently harmless bug where circuits
26346 would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
26347 servers, and never switch to state CIRCUIT_STATE_OPEN.
26348 - Check for even more Windows version flags when writing the platform
26349 string in server descriptors, and note any we don't recognize.
26350 - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
26351 get a better idea of why their circuits failed. Not used yet.
26352 - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
26353 We don't use them yet, but maybe one day our DNS resolver will be
26354 able to discover them.
26355 - Let people type "tor --install" as well as "tor -install" when they
26356 want to make it an NT service.
26357 - Looks like we were never delivering deflated (i.e. compressed)
26358 running-routers lists, even when asked. Oops.
26359 - We were leaking some memory every time the client changed IPs.
26360 - Clean up more of the OpenSSL memory when exiting, so we can detect
26361 memory leaks better.
26362 - Never call free() on tor_malloc()d memory. This will help us
26363 use dmalloc to detect memory leaks.
26364 - Some Tor servers process billions of cells per day. These
26365 statistics are now uint64_t's.
26366 - Check [X-]Forwarded-For headers in HTTP requests when generating
26367 log messages. This lets people run dirservers (and caches) behind
26368 Apache but still know which IP addresses are causing warnings.
26369 - Fix minor integer overflow in calculating when we expect to use up
26370 our bandwidth allocation before hibernating.
26371 - Lower the minimum required number of file descriptors to 1000,
26372 so we can have some overhead for Valgrind on Linux, where the
26373 default ulimit -n is 1024.
26374 - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
26375 and its existence is confusing some users.
26377 o Config option fixes:
26378 - Add a new config option ExitPolicyRejectPrivate which defaults
26379 to on. Now all exit policies will begin with rejecting private
26380 addresses, unless the server operator explicitly turns it off.
26381 - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
26382 - Add new ReachableORAddresses and ReachableDirAddresses options
26383 that understand address policies. FascistFirewall is now a synonym
26384 for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
26385 - Start calling it FooListenAddress rather than FooBindAddress,
26386 since few of our users know what it means to bind an address
26388 - If the user gave Tor an odd number of command-line arguments,
26389 we were silently ignoring the last one. Now we complain and fail.
26390 This wins the oldest-bug prize -- this bug has been present since
26391 November 2002, as released in Tor 0.0.0.
26392 - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
26393 torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
26394 it would silently ignore the 6668.
26395 - If we get a linelist or linelist_s config option from the torrc,
26396 e.g. ExitPolicy, and it has no value, warn and skip rather than
26397 silently resetting it to its default.
26398 - Setconf was appending items to linelists, not clearing them.
26399 - Add MyFamily to torrc.sample in the server section, so operators
26400 will be more likely to learn that it exists.
26401 - Make ContactInfo mandatory for authoritative directory servers.
26402 - MaxConn has been obsolete for a while now. Document the ConnLimit
26403 config option, which is a *minimum* number of file descriptors
26404 that must be available else Tor refuses to start.
26405 - Get rid of IgnoreVersion undocumented config option, and make us
26406 only warn, never exit, when we're running an obsolete version.
26407 - Make MonthlyAccountingStart config option truly obsolete now.
26408 - Correct the man page entry on TrackHostExitsExpire.
26409 - Let directory authorities start even if they don't specify an
26410 Address config option.
26411 - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
26412 reflect the updated flags in our v2 dir protocol.
26414 o Config option features:
26415 - Add a new config option FastFirstHopPK (on by default) so clients
26416 do a trivial crypto handshake for their first hop, since TLS has
26417 already taken care of confidentiality and authentication.
26418 - Let the user set ControlListenAddress in the torrc. This can be
26419 dangerous, but there are some cases (like a secured LAN) where it
26421 - New config options to help controllers: FetchServerDescriptors
26422 and FetchHidServDescriptors for whether to fetch server
26423 info and hidserv info or let the controller do it, and
26424 PublishServerDescriptor and PublishHidServDescriptors.
26425 - Also let the controller set the __AllDirActionsPrivate config
26426 option if you want all directory fetches/publishes to happen via
26427 Tor (it assumes your controller bootstraps your circuits).
26428 - Add "HardwareAccel" config option: support for crypto hardware
26429 accelerators via OpenSSL. Off by default, until we find somebody
26430 smart who can test it for us. (It appears to produce seg faults
26431 in at least some cases.)
26432 - New config option "AuthDirRejectUnlisted" for directory authorities
26433 as a panic button: if we get flooded with unusable servers we can
26434 revert to only listing servers in the approved-routers file.
26435 - Directory authorities can now reject/invalidate by key and IP,
26436 with the config options "AuthDirInvalid" and "AuthDirReject", or
26437 by marking a fingerprint as "!reject" or "!invalid" (as its
26438 nickname) in the approved-routers file. This is useful since
26439 currently we automatically list servers as running and usable
26440 even if we know they're jerks.
26441 - Add a new config option TestSocks so people can see whether their
26442 applications are using socks4, socks4a, socks5-with-ip, or
26443 socks5-with-fqdn. This way they don't have to keep mucking
26444 with tcpdump and wondering if something got cached somewhere.
26445 - Add "private:*" as an alias in configuration for policies. Now
26446 you can simplify your exit policy rather than needing to list
26447 every single internal or nonroutable network space.
26448 - Accept "private:*" in routerdesc exit policies; not generated yet
26449 because older Tors do not understand it.
26450 - Add configuration option "V1AuthoritativeDirectory 1" which
26451 moria1, moria2, and tor26 have set.
26452 - Implement an option, VirtualAddrMask, to set which addresses
26453 get handed out in response to mapaddress requests. This works
26454 around a bug in tsocks where 127.0.0.0/8 is never socksified.
26455 - Add a new config option FetchUselessDescriptors, off by default,
26456 for when you plan to run "exitlist" on your client and you want
26457 to know about even the non-running descriptors.
26458 - SocksTimeout: How long do we let a socks connection wait
26459 unattached before we fail it?
26460 - CircuitBuildTimeout: Cull non-open circuits that were born
26461 at least this many seconds ago.
26462 - CircuitIdleTimeout: Cull open clean circuits that were born
26463 at least this many seconds ago.
26464 - New config option SafeSocks to reject all application connections
26465 using unsafe socks protocols. Defaults to off.
26467 o Improved and clearer log messages:
26468 - Reduce clutter in server logs. We're going to try to make
26469 them actually usable now. New config option ProtocolWarnings that
26470 lets you hear about how _other Tors_ are breaking the protocol. Off
26472 - Divide log messages into logging domains. Once we put some sort
26473 of interface on this, it will let people looking at more verbose
26474 log levels specify the topics they want to hear more about.
26475 - Log server fingerprint on startup, so new server operators don't
26476 have to go hunting around their filesystem for it.
26477 - Provide dire warnings to any users who set DirServer manually;
26478 move it out of torrc.sample and into torrc.complete.
26479 - Make the log message less scary when all the dirservers are
26480 temporarily unreachable.
26481 - When tor_socketpair() fails in Windows, give a reasonable
26482 Windows-style errno back.
26483 - Improve tor_gettimeofday() granularity on windows.
26484 - We were printing the number of idle dns workers incorrectly when
26486 - Handle duplicate lines in approved-routers files without warning.
26487 - We were whining about using socks4 or socks5-with-local-lookup
26488 even when it's an IP address in the "virtual" range we designed
26489 exactly for this case.
26490 - Check for named servers when looking them up by nickname;
26491 warn when we're calling a non-named server by its nickname;
26492 don't warn twice about the same name.
26493 - Downgrade the dirserver log messages when whining about
26495 - Correct "your server is reachable" log entries to indicate that
26496 it was self-testing that told us so.
26497 - If we're trying to be a Tor server and running Windows 95/98/ME
26498 as a server, explain that we'll likely crash.
26499 - Provide a more useful warn message when our onion queue gets full:
26500 the CPU is too slow or the exit policy is too liberal.
26501 - Don't warn when we receive a 503 from a dirserver/cache -- this
26502 will pave the way for them being able to refuse if they're busy.
26503 - When we fail to bind a listener, try to provide a more useful
26504 log message: e.g., "Is Tor already running?"
26505 - Only start testing reachability once we've established a
26506 circuit. This will make startup on dir authorities less noisy.
26507 - Don't try to upload hidden service descriptors until we have
26508 established a circuit.
26509 - Tor didn't warn when it failed to open a log file.
26510 - Warn when listening on a public address for socks. We suspect a
26511 lot of people are setting themselves up as open socks proxies,
26512 and they have no idea that jerks on the Internet are using them,
26513 since they simply proxy the traffic into the Tor network.
26514 - Give a useful message when people run Tor as the wrong user,
26515 rather than telling them to start chowning random directories.
26516 - Fix a harmless bug that was causing Tor servers to log
26517 "Got an end because of misc error, but we're not an AP. Closing."
26518 - Fix wrong log message when you add a "HiddenServiceNodes" config
26519 line without any HiddenServiceDir line (reported by Chris Thomas).
26520 - Directory authorities now stop whining so loudly about bad
26521 descriptors that they fetch from other dirservers. So when there's
26522 a log complaint, it's for sure from a freshly uploaded descriptor.
26523 - When logging via syslog, include the pid whenever we provide
26524 a log entry. Suggested by Todd Fries.
26525 - When we're shutting down and we do something like try to post a
26526 server descriptor or rendezvous descriptor, don't complain that
26527 we seem to be unreachable. Of course we are, we're shutting down.
26528 - Change log line for unreachability to explicitly suggest /etc/hosts
26529 as the culprit. Also make it clearer what IP address and ports we're
26530 testing for reachability.
26531 - Put quotes around user-supplied strings when logging so users are
26532 more likely to realize if they add bad characters (like quotes)
26534 - NT service patch from Matt Edman to improve error messages on Win32.
26537 Changes in version 0.1.0.17 - 2006-02-17
26538 o Crash bugfixes on 0.1.0.x:
26539 - When servers with a non-zero DirPort came out of hibernation,
26540 sometimes they would trigger an assert.
26542 o Other important bugfixes:
26543 - On platforms that don't have getrlimit (like Windows), we were
26544 artificially constraining ourselves to a max of 1024
26545 connections. Now just assume that we can handle as many as 15000
26546 connections. Hopefully this won't cause other problems.
26548 o Backported features:
26549 - When we're a server, a client asks for an old-style directory,
26550 and our write bucket is empty, don't give it to him. This way
26551 small servers can continue to serve the directory *sometimes*,
26552 without getting overloaded.
26553 - Whenever you get a 503 in response to a directory fetch, try
26554 once more. This will become important once servers start sending
26555 503's whenever they feel busy.
26556 - Fetch a new directory every 120 minutes, not every 40 minutes.
26557 Now that we have hundreds of thousands of users running the old
26558 directory algorithm, it's starting to hurt a lot.
26559 - Bump up the period for forcing a hidden service descriptor upload
26560 from 20 minutes to 1 hour.
26563 Changes in version 0.1.0.16 - 2006-01-02
26564 o Crash bugfixes on 0.1.0.x:
26565 - On Windows, build with a libevent patch from "I-M Weasel" to avoid
26566 corrupting the heap, losing FDs, or crashing when we need to resize
26567 the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
26568 - It turns out sparc64 platforms crash on unaligned memory access
26569 too -- so detect and avoid this.
26570 - Handle truncated compressed data correctly (by detecting it and
26572 - Fix possible-but-unlikely free(NULL) in control.c.
26573 - When we were closing connections, there was a rare case that
26574 stomped on memory, triggering seg faults and asserts.
26575 - Avoid potential infinite recursion when building a descriptor. (We
26576 don't know that it ever happened, but better to fix it anyway.)
26577 - We were neglecting to unlink marked circuits from soon-to-close OR
26578 connections, which caused some rare scribbling on freed memory.
26579 - Fix a memory stomping race bug when closing the joining point of two
26580 rendezvous circuits.
26581 - Fix an assert in time parsing found by Steven Murdoch.
26583 o Other bugfixes on 0.1.0.x:
26584 - When we're doing reachability testing, provide more useful log
26585 messages so the operator knows what to expect.
26586 - Do not check whether DirPort is reachable when we are suppressing
26587 advertising it because of hibernation.
26588 - When building with -static or on Solaris, we sometimes needed -ldl.
26589 - One of the dirservers (tor26) changed its IP address.
26590 - When we're deciding whether a stream has enough circuits around
26591 that can handle it, count the freshly dirty ones and not the ones
26592 that are so dirty they won't be able to handle it.
26593 - When we're expiring old circuits, we had a logic error that caused
26594 us to close new rendezvous circuits rather than old ones.
26595 - Give a more helpful log message when you try to change ORPort via
26596 the controller: you should upgrade Tor if you want that to work.
26597 - We were failing to parse Tor versions that start with "Tor ".
26598 - Tolerate faulty streams better: when a stream fails for reason
26599 exitpolicy, stop assuming that the router is lying about his exit
26600 policy. When a stream fails for reason misc, allow it to retry just
26601 as if it was resolvefailed. When a stream has failed three times,
26602 reset its failure count so we can try again and get all three tries.
26605 Changes in version 0.1.0.15 - 2005-09-23
26606 o Bugfixes on 0.1.0.x:
26607 - Reject ports 465 and 587 (spam targets) in default exit policy.
26608 - Don't crash when we don't have any spare file descriptors and we
26609 try to spawn a dns or cpu worker.
26610 - Get rid of IgnoreVersion undocumented config option, and make us
26611 only warn, never exit, when we're running an obsolete version.
26612 - Don't try to print a null string when your server finds itself to
26613 be unreachable and the Address config option is empty.
26614 - Make the numbers in read-history and write-history into uint64s,
26615 so they don't overflow and publish negatives in the descriptor.
26616 - Fix a minor memory leak in smartlist_string_remove().
26617 - We were only allowing ourselves to upload a server descriptor at
26618 most every 20 minutes, even if it changed earlier than that.
26619 - Clean up log entries that pointed to old URLs.
26622 Changes in version 0.1.0.14 - 2005-08-08
26623 o Bugfixes on 0.1.0.x:
26624 - Fix the other half of the bug with crypto handshakes
26626 - Fix an assert trigger if you send a 'signal term' via the
26627 controller when it's listening for 'event info' messages.
26630 Changes in version 0.1.0.13 - 2005-08-04
26631 o Bugfixes on 0.1.0.x:
26632 - Fix a critical bug in the security of our crypto handshakes.
26633 - Fix a size_t underflow in smartlist_join_strings2() that made
26634 it do bad things when you hand it an empty smartlist.
26635 - Fix Windows installer to ship Tor license (thanks to Aphex for
26636 pointing out this oversight) and put a link to the doc directory
26638 - Explicitly set no-unaligned-access for sparc: it turns out the
26639 new gcc's let you compile broken code, but that doesn't make it
26643 Changes in version 0.1.0.12 - 2005-07-18
26644 o New directory servers:
26645 - tor26 has changed IP address.
26647 o Bugfixes on 0.1.0.x:
26648 - Fix a possible double-free in tor_gzip_uncompress().
26649 - When --disable-threads is set, do not search for or link against
26650 pthreads libraries.
26651 - Don't trigger an assert if an authoritative directory server
26652 claims its dirport is 0.
26653 - Fix bug with removing Tor as an NT service: some people were
26654 getting "The service did not return an error." Thanks to Matt
26658 Changes in version 0.1.0.11 - 2005-06-30
26659 o Bugfixes on 0.1.0.x:
26660 - Fix major security bug: servers were disregarding their
26661 exit policies if clients behaved unexpectedly.
26662 - Make OS X init script check for missing argument, so we don't
26663 confuse users who invoke it incorrectly.
26664 - Fix a seg fault in "tor --hash-password foo".
26665 - The MAPADDRESS control command was broken.
26668 Changes in version 0.1.0.10 - 2005-06-14
26670 - Make NT services work and start on startup on Win32 (based on
26671 patch by Matt Edman). See the FAQ entry for details.
26672 - Make 'platform' string in descriptor more accurate for Win32
26673 servers, so it's not just "unknown platform".
26674 - REUSEADDR on normal platforms means you can rebind to the port
26675 right after somebody else has let it go. But REUSEADDR on Win32
26676 means you can bind to the port _even when somebody else already
26677 has it bound_! So, don't do that on Win32.
26678 - Clean up the log messages when starting on Win32 with no config
26680 - Allow seeding the RNG on Win32 even when you're not running as
26681 Administrator. If seeding the RNG on Win32 fails, quit.
26683 o Assert / crash bugs:
26684 - Refuse relay cells that claim to have a length larger than the
26685 maximum allowed. This prevents a potential attack that could read
26686 arbitrary memory (e.g. keys) from an exit server's process
26688 - If unofficial Tor clients connect and send weird TLS certs, our
26689 Tor server triggers an assert. Stop asserting, and start handling
26690 TLS errors better in other situations too.
26691 - Fix a race condition that can trigger an assert when we have a
26692 pending create cell and an OR connection attempt fails.
26695 - Use pthreads for worker processes rather than forking. This was
26696 forced because when we forked, we ended up wasting a lot of
26697 duplicate ram over time.
26698 - Also switch to foo_r versions of some library calls to allow
26699 reentry and threadsafeness.
26700 - Implement --disable-threads configure option. Disable threads on
26701 netbsd and openbsd by default, because they have no reentrant
26702 resolver functions (!), and on solaris since it has other
26704 - Fix possible bug on threading platforms (e.g. win32) which was
26705 leaking a file descriptor whenever a cpuworker or dnsworker died.
26706 - Fix a minor memory leak when somebody establishes an introduction
26707 point at your Tor server.
26708 - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
26710 - Add ./configure --with-dmalloc option, to track memory leaks.
26711 - And try to free all memory on closing, so we can detect what
26714 o Protocol correctness:
26715 - When we've connected to an OR and handshaked but didn't like
26716 the result, we were closing the conn without sending destroy
26717 cells back for pending circuits. Now send those destroys.
26718 - Start sending 'truncated' cells back rather than destroy cells
26719 if the circuit closes in front of you. This means we won't have
26720 to abandon partially built circuits.
26721 - Handle changed router status correctly when dirserver reloads
26722 fingerprint file. We used to be dropping all unverified descriptors
26723 right then. The bug was hidden because we would immediately
26724 fetch a directory from another dirserver, which would include the
26725 descriptors we just dropped.
26726 - Revise tor-spec to add more/better stream end reasons.
26727 - Revise all calls to connection_edge_end to avoid sending 'misc',
26728 and to take errno into account where possible.
26729 - Client now retries when streams end early for 'hibernating' or
26730 'resource limit' reasons, rather than failing them.
26731 - Try to be more zealous about calling connection_edge_end when
26732 things go bad with edge conns in connection.c.
26734 o Robustness improvements:
26735 - Better handling for heterogeneous / unreliable nodes:
26736 - Annotate circuits with whether they aim to contain high uptime
26737 nodes and/or high capacity nodes. When building circuits, choose
26739 - This means that every single node in an intro rend circuit,
26740 not just the last one, will have a minimum uptime.
26741 - New config option LongLivedPorts to indicate application streams
26742 that will want high uptime circuits.
26743 - Servers reset uptime when a dir fetch entirely fails. This
26744 hopefully reflects stability of the server's network connectivity.
26745 - If somebody starts his tor server in Jan 2004 and then fixes his
26746 clock, don't make his published uptime be a year.
26747 - Reset published uptime when we wake up from hibernation.
26748 - Introduce a notion of 'internal' circs, which are chosen without
26749 regard to the exit policy of the last hop. Intro and rendezvous
26750 circs must be internal circs, to avoid leaking information. Resolve
26751 and connect streams can use internal circs if they want.
26752 - New circuit pooling algorithm: keep track of what destination ports
26753 we've used recently (start out assuming we'll want to use 80), and
26754 make sure to have enough circs around to satisfy these ports. Also
26755 make sure to have 2 internal circs around if we've required internal
26756 circs lately (and with high uptime if we've seen that lately too).
26757 - Turn addr_policy_compare from a tristate to a quadstate; this should
26758 help address our "Ah, you allow 1.2.3.4:80. You are a good choice
26759 for google.com" problem.
26760 - When a client asks us for a dir mirror and we don't have one,
26761 launch an attempt to get a fresh one.
26762 - First cut at support for "create-fast" cells. Clients can use
26763 these when extending to their first hop, since the TLS already
26764 provides forward secrecy and authentication. Not enabled on
26767 o Reachability testing.
26768 - Your Tor server will automatically try to see if its ORPort and
26769 DirPort are reachable from the outside, and it won't upload its
26770 descriptor until it decides at least ORPort is reachable (when
26771 DirPort is not yet found reachable, publish it as zero).
26772 - When building testing circs for ORPort testing, use only
26773 high-bandwidth nodes, so fewer circuits fail.
26774 - Notice when our IP changes, and reset stats/uptime/reachability.
26775 - Authdirservers don't do ORPort reachability detection, since
26776 they're in clique mode, so it will be rare to find a server not
26777 already connected to them.
26778 - Authdirservers now automatically approve nodes running 0.1.0.2-rc
26782 - Now we allow two unverified servers with the same nickname
26783 but different keys. But if a nickname is verified, only that
26784 nickname+key are allowed.
26785 - If you're an authdirserver connecting to an address:port,
26786 and it's not the OR you were expecting, forget about that
26787 descriptor. If he *was* the one you were expecting, then forget
26788 about all other descriptors for that address:port.
26789 - Allow servers to publish descriptors from 12 hours in the future.
26790 Corollary: only whine about clock skew from the dirserver if
26791 he's a trusted dirserver (since now even verified servers could
26792 have quite wrong clocks).
26793 - Require servers that use the default dirservers to have public IP
26794 addresses. We have too many servers that are configured with private
26795 IPs and their admins never notice the log entries complaining that
26796 their descriptors are being rejected.
26798 o Efficiency improvements:
26799 - Use libevent. Now we can use faster async cores (like epoll, kpoll,
26800 and /dev/poll), and hopefully work better on Windows too.
26801 - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
26802 kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
26803 - Find libevent even if it's hiding in /usr/local/ and your
26804 CFLAGS and LDFLAGS don't tell you to look there.
26805 - Be able to link with libevent as a shared library (the default
26806 after 1.0d), even if it's hiding in /usr/local/lib and even
26807 if you haven't added /usr/local/lib to your /etc/ld.so.conf,
26808 assuming you're running gcc. Otherwise fail and give a useful
26810 - Switch to a new buffer management algorithm, which tries to avoid
26811 reallocing and copying quite as much. In first tests it looks like
26812 it uses *more* memory on average, but less cpu.
26813 - Switch our internal buffers implementation to use a ring buffer,
26814 to hopefully improve performance for fast servers a lot.
26815 - Reenable the part of the code that tries to flush as soon as an
26816 OR outbuf has a full TLS record available. Perhaps this will make
26817 OR outbufs not grow as huge except in rare cases, thus saving lots
26818 of CPU time plus memory.
26819 - Improve performance for dirservers: stop re-parsing the whole
26820 directory every time you regenerate it.
26821 - Keep a big splay tree of (circid,orconn)->circuit mappings to make
26822 it much faster to look up a circuit for each relay cell.
26823 - Remove most calls to assert_all_pending_dns_resolves_ok(),
26824 since they're eating our cpu on exit nodes.
26825 - Stop wasting time doing a case insensitive comparison for every
26826 dns name every time we do any lookup. Canonicalize the names to
26827 lowercase when you first see them.
26830 - Handle unavailable hidden services better. Handle slow or busy
26831 hidden services better.
26832 - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
26833 circ as necessary, if there are any completed ones lying around
26834 when we try to launch one.
26835 - Make hidden services try to establish a rendezvous for 30 seconds
26836 after fetching the descriptor, rather than for n (where n=3)
26837 attempts to build a circuit.
26838 - Adjust maximum skew and age for rendezvous descriptors: let skew
26839 be 48 hours rather than 90 minutes.
26840 - Reject malformed .onion addresses rather then passing them on as
26841 normal web requests.
26844 - More Tor controller support. See
26845 http://tor.eff.org/doc/control-spec.txt for all the new features,
26846 including signals to emulate unix signals from any platform;
26847 redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
26848 closestream; closecircuit; etc.
26849 - Encode hashed controller passwords in hex instead of base64,
26850 to make it easier to write controllers.
26851 - Revise control spec and implementation to allow all log messages to
26852 be sent to controller with their severities intact (suggested by
26853 Matt Edman). Disable debug-level logs while delivering a debug-level
26854 log to the controller, to prevent loop. Update TorControl to handle
26855 new log event types.
26857 o New config options/defaults:
26858 - Begin scrubbing sensitive strings from logs by default. Turn off
26859 the config option SafeLogging if you need to do debugging.
26860 - New exit policy: accept most low-numbered ports, rather than
26861 rejecting most low-numbered ports.
26862 - Put a note in the torrc about abuse potential with the default
26864 - Add support for CONNECTing through https proxies, with "HttpsProxy"
26866 - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
26867 based on patch from Adam Langley (basic auth only).
26868 - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
26869 the fast servers that have been joining lately. (Clients are now
26870 willing to load balance over up to 2 MB of advertised bandwidth
26872 - New config option MaxAdvertisedBandwidth which lets you advertise
26873 a low bandwidthrate (to not attract as many circuits) while still
26874 allowing a higher bandwidthrate in reality.
26875 - Require BandwidthRate to be at least 20kB/s for servers.
26876 - Add a NoPublish config option, so you can be a server (e.g. for
26877 testing running Tor servers in other Tor networks) without
26878 publishing your descriptor to the primary dirservers.
26879 - Add a new AddressMap config directive to rewrite incoming socks
26880 addresses. This lets you, for example, declare an implicit
26881 required exit node for certain sites.
26882 - Add a new TrackHostExits config directive to trigger addressmaps
26883 for certain incoming socks addresses -- for sites that break when
26884 your exit keeps changing (based on patch from Mike Perry).
26885 - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
26886 which describes how often we retry making new circuits if current
26887 ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
26888 how long we're willing to make use of an already-dirty circuit.
26889 - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
26890 a config option "ShutdownWaitLength" (when using kill -INT on
26892 - Fix an edge case in parsing config options: if they say "--"
26893 on the commandline, it's not a config option (thanks weasel).
26894 - New config option DirAllowPrivateAddresses for authdirservers.
26895 Now by default they refuse router descriptors that have non-IP or
26896 private-IP addresses.
26897 - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
26898 smart" default value: low for servers and high for clients.
26899 - Some people were putting "Address " in their torrc, and they had
26900 a buggy resolver that resolved " " to 0.0.0.0. Oops.
26901 - If DataDir is ~/.tor, and that expands to /.tor, then default to
26902 LOCALSTATEDIR/tor instead.
26903 - Implement --verify-config command-line option to check if your torrc
26904 is valid without actually launching Tor.
26906 o Logging improvements:
26907 - When dirservers refuse a server descriptor, we now log its
26908 contactinfo, platform, and the poster's IP address.
26909 - Only warn once per nickname from add_nickname_list_to_smartlist()
26910 per failure, so an entrynode or exitnode choice that's down won't
26912 - When we're connecting to an OR and he's got a different nickname/key
26913 than we were expecting, only complain loudly if we're an OP or a
26914 dirserver. Complaining loudly to the OR admins just confuses them.
26915 - Whine at you if you're a server and you don't set your contactinfo.
26916 - Warn when exit policy implicitly allows local addresses.
26917 - Give a better warning when some other server advertises an
26918 ORPort that is actually an apache running ssl.
26919 - If we get an incredibly skewed timestamp from a dirserver mirror
26920 that isn't a verified OR, don't warn -- it's probably him that's
26922 - When a dirserver causes you to give a warn, mention which dirserver
26924 - Initialize libevent later in the startup process, so the logs are
26925 already established by the time we start logging libevent warns.
26926 - Use correct errno on win32 if libevent fails.
26927 - Check and warn about known-bad/slow libevent versions.
26928 - Stop warning about sigpipes in the logs. We're going to
26929 pretend that getting these occasionally is normal and fine.
26931 o New contrib scripts:
26932 - New experimental script tor/contrib/exitlist: a simple python
26933 script to parse directories and find Tor nodes that exit to listed
26935 - New experimental script tor/contrib/ExerciseServer.py (needs more
26936 work) that uses the controller interface to build circuits and
26937 fetch pages over them. This will help us bootstrap servers that
26938 have lots of capacity but haven't noticed it yet.
26939 - New experimental script tor/contrib/PathDemo.py (needs more work)
26940 that uses the controller interface to let you choose whole paths
26942 "<hostname>.<path,separated by dots>.<length of path>.path"
26943 - New contributed script "privoxy-tor-toggle" to toggle whether
26944 Privoxy uses Tor. Seems to be configured for Debian by default.
26945 - Have torctl.in/tor.sh.in check for location of su binary (needed
26949 - chdir() to your datadirectory at the *end* of the daemonize process,
26950 not the beginning. This was a problem because the first time you
26951 run tor, if your datadir isn't there, and you have runasdaemon set
26952 to 1, it will try to chdir to it before it tries to create it. Oops.
26953 - Fix several double-mark-for-close bugs, e.g. where we were finding
26954 a conn for a cell even if that conn is already marked for close.
26955 - Stop most cases of hanging up on a socks connection without sending
26957 - Fix a bug in the RPM package: set home directory for _tor to
26958 something more reasonable when first installing.
26959 - Stop putting nodename in the Platform string in server descriptors.
26960 It doesn't actually help, and it is confusing/upsetting some people.
26961 - When using preferred entry or exit nodes, ignore whether the
26962 circuit wants uptime or capacity. They asked for the nodes, they
26964 - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
26965 artificially capped at 500kB.
26966 - Cache local dns resolves correctly even when they're .exit
26968 - If we're hibernating and we get a SIGINT, exit immediately.
26969 - tor-resolve requests were ignoring .exit if there was a working circuit
26970 they could use instead.
26971 - Pay more attention to the ClientOnly config option.
26972 - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
26973 installer screens; and don't put stuff into StartupItems unless
26974 the user asks you to.
26977 - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
26978 rather than just rejecting it.
26979 - If our clock jumps forward by 100 seconds or more, assume something
26980 has gone wrong with our network and abandon all not-yet-used circs.
26981 - When an application is using socks5, give him the whole variety of
26982 potential socks5 responses (connect refused, host unreachable, etc),
26983 rather than just "success" or "failure".
26984 - A more sane version numbering system. See
26985 http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
26986 - Change version parsing logic: a version is "obsolete" if it is not
26987 recommended and (1) there is a newer recommended version in the
26988 same series, or (2) there are no recommended versions in the same
26989 series, but there are some recommended versions in a newer series.
26990 A version is "new" if it is newer than any recommended version in
26992 - Report HTTP reasons to client when getting a response from directory
26993 servers -- so you can actually know what went wrong.
26994 - Reject odd-looking addresses at the client (e.g. addresses that
26995 contain a colon), rather than having the server drop them because
26997 - Stop publishing socksport in the directory, since it's not
26998 actually meant to be public. For compatibility, publish a 0 there
27000 - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
27001 cookies to disk and doesn't log each web request to disk. (Thanks
27002 to Brett Carrington for pointing this out.)
27003 - Add OSX uninstall instructions. An actual uninstall script will
27005 - Add "opt hibernating 1" to server descriptor to make it clearer
27006 whether the server is hibernating.
27009 Changes in version 0.0.9.10 - 2005-06-16
27010 o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
27011 - Refuse relay cells that claim to have a length larger than the
27012 maximum allowed. This prevents a potential attack that could read
27013 arbitrary memory (e.g. keys) from an exit server's process
27017 Changes in version 0.0.9.9 - 2005-04-23
27018 o Bugfixes on 0.0.9.x:
27019 - If unofficial Tor clients connect and send weird TLS certs, our
27020 Tor server triggers an assert. This release contains a minimal
27021 backport from the broader fix that we put into 0.1.0.4-rc.
27024 Changes in version 0.0.9.8 - 2005-04-07
27025 o Bugfixes on 0.0.9.x:
27026 - We have a bug that I haven't found yet. Sometimes, very rarely,
27027 cpuworkers get stuck in the 'busy' state, even though the cpuworker
27028 thinks of itself as idle. This meant that no new circuits ever got
27029 established. Here's a workaround to kill any cpuworker that's been
27030 busy for more than 100 seconds.
27033 Changes in version 0.0.9.7 - 2005-04-01
27034 o Bugfixes on 0.0.9.x:
27035 - Fix another race crash bug (thanks to Glenn Fink for reporting).
27036 - Compare identity to identity, not to nickname, when extending to
27037 a router not already in the directory. This was preventing us from
27038 extending to unknown routers. Oops.
27039 - Make sure to create OS X Tor user in <500 range, so we aren't
27040 creating actual system users.
27041 - Note where connection-that-hasn't-sent-end was marked, and fix
27042 a few really loud instances of this harmless bug (it's fixed more
27046 Changes in version 0.0.9.6 - 2005-03-24
27047 o Bugfixes on 0.0.9.x (crashes and asserts):
27048 - Add new end stream reasons to maintenance branch. Fix bug where
27049 reason (8) could trigger an assert. Prevent bug from recurring.
27050 - Apparently win32 stat wants paths to not end with a slash.
27051 - Fix assert triggers in assert_cpath_layer_ok(), where we were
27052 blowing away the circuit that conn->cpath_layer points to, then
27053 checking to see if the circ is well-formed. Backport check to make
27054 sure we dont use the cpath on a closed connection.
27055 - Prevent circuit_resume_edge_reading_helper() from trying to package
27056 inbufs for marked-for-close streams.
27057 - Don't crash on hup if your options->address has become unresolvable.
27058 - Some systems (like OS X) sometimes accept() a connection and tell
27059 you the remote host is 0.0.0.0:0. If this happens, due to some
27060 other mis-features, we get confused; so refuse the conn for now.
27062 o Bugfixes on 0.0.9.x (other):
27063 - Fix harmless but scary "Unrecognized content encoding" warn message.
27064 - Add new stream error reason: TORPROTOCOL reason means "you are not
27065 speaking a version of Tor I understand; say bye-bye to your stream."
27066 - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
27067 into the future, now that we are more tolerant of skew. This
27068 resolves a bug where a Tor server would refuse to cache a directory
27069 because all the directories it gets are too far in the future;
27070 yet the Tor server never logs any complaints about clock skew.
27071 - Mac packaging magic: make man pages useable, and do not overwrite
27072 existing torrc files.
27073 - Make OS X log happily to /var/log/tor/tor.log
27076 Changes in version 0.0.9.5 - 2005-02-22
27077 o Bugfixes on 0.0.9.x:
27078 - Fix an assert race at exit nodes when resolve requests fail.
27079 - Stop picking unverified dir mirrors--it only leads to misery.
27080 - Patch from Matt Edman to make NT services work better. Service
27081 support is still not compiled into the executable by default.
27082 - Patch from Dmitri Bely so the Tor service runs better under
27083 the win32 SYSTEM account.
27084 - Make tor-resolve actually work (?) on Win32.
27085 - Fix a sign bug when getrlimit claims to have 4+ billion
27086 file descriptors available.
27087 - Stop refusing to start when bandwidthburst == bandwidthrate.
27088 - When create cells have been on the onion queue more than five
27089 seconds, just send back a destroy and take them off the list.
27092 Changes in version 0.0.9.4 - 2005-02-03
27093 o Bugfixes on 0.0.9:
27094 - Fix an assert bug that took down most of our servers: when
27095 a server claims to have 1 GB of bandwidthburst, don't
27097 - Don't crash as badly if we have spawned the max allowed number
27098 of dnsworkers, or we're out of file descriptors.
27099 - Block more file-sharing ports in the default exit policy.
27100 - MaxConn is now automatically set to the hard limit of max
27101 file descriptors we're allowed (ulimit -n), minus a few for
27103 - Give a clearer message when servers need to raise their
27104 ulimit -n when they start running out of file descriptors.
27105 - SGI Compatibility patches from Jan Schaumann.
27106 - Tolerate a corrupt cached directory better.
27107 - When a dirserver hasn't approved your server, list which one.
27108 - Go into soft hibernation after 95% of the bandwidth is used,
27109 not 99%. This is especially important for daily hibernators who
27110 have a small accounting max. Hopefully it will result in fewer
27111 cut connections when the hard hibernation starts.
27112 - Load-balance better when using servers that claim more than
27113 800kB/s of capacity.
27114 - Make NT services work (experimental, only used if compiled in).
27117 Changes in version 0.0.9.3 - 2005-01-21
27118 o Bugfixes on 0.0.9:
27119 - Backport the cpu use fixes from main branch, so busy servers won't
27120 need as much processor time.
27121 - Work better when we go offline and then come back, or when we
27122 run Tor at boot before the network is up. We do this by
27123 optimistically trying to fetch a new directory whenever an
27124 application request comes in and we think we're offline -- the
27125 human is hopefully a good measure of when the network is back.
27126 - Backport some minimal hidserv bugfixes: keep rend circuits open as
27127 long as you keep using them; actually publish hidserv descriptors
27128 shortly after they change, rather than waiting 20-40 minutes.
27129 - Enable Mac startup script by default.
27130 - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
27131 - When you update AllowUnverifiedNodes or FirewallPorts via the
27132 controller's setconf feature, we were always appending, never
27134 - When you update HiddenServiceDir via setconf, it was screwing up
27135 the order of reading the lines, making it fail.
27136 - Do not rewrite a cached directory back to the cache; otherwise we
27137 will think it is recent and not fetch a newer one on startup.
27138 - Workaround for webservers that lie about Content-Encoding: Tor
27139 now tries to autodetect compressed directories and compression
27140 itself. This lets us Proxypass dir fetches through apache.
27143 Changes in version 0.0.9.2 - 2005-01-04
27144 o Bugfixes on 0.0.9 (crashes and asserts):
27145 - Fix an assert on startup when the disk is full and you're logging
27147 - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
27148 style address, then we'd crash.
27149 - Fix an assert trigger when the running-routers string we get from
27150 a dirserver is broken.
27151 - Make worker threads start and run on win32. Now win32 servers
27153 - Bandaid (not actually fix, but now it doesn't crash) an assert
27154 where the dns worker dies mysteriously and the main Tor process
27155 doesn't remember anything about the address it was resolving.
27157 o Bugfixes on 0.0.9 (Win32):
27158 - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
27159 name out of the warning/assert messages.
27160 - Fix a superficial "unhandled error on read" bug on win32.
27161 - The win32 installer no longer requires a click-through for our
27162 license, since our Free Software license grants rights but does not
27164 - Win32: When connecting to a dirserver fails, try another one
27165 immediately. (This was already working for non-win32 Tors.)
27166 - Stop trying to parse $HOME on win32 when hunting for default
27168 - Make tor-resolve.c work on win32 by calling network_init().
27170 o Bugfixes on 0.0.9 (other):
27171 - Make 0.0.9.x build on Solaris again.
27172 - Due to a fencepost error, we were blowing away the \n when reporting
27173 confvalue items in the controller. So asking for multiple config
27174 values at once couldn't work.
27175 - When listing circuits that are pending on an opening OR connection,
27176 if we're an OR we were listing circuits that *end* at us as
27177 being pending on every listener, dns/cpu worker, etc. Stop that.
27178 - Dirservers were failing to create 'running-routers' or 'directory'
27179 strings if we had more than some threshold of routers. Fix them so
27180 they can handle any number of routers.
27181 - Fix a superficial "Duplicate mark for close" bug.
27182 - Stop checking for clock skew for OR connections, even for servers.
27183 - Fix a fencepost error that was chopping off the last letter of any
27184 nickname that is the maximum allowed nickname length.
27185 - Update URLs in log messages so they point to the new website.
27186 - Fix a potential problem in mangling server private keys while
27187 writing to disk (not triggered yet, as far as we know).
27188 - Include the licenses for other free software we include in Tor,
27189 now that we're shipping binary distributions more regularly.
27192 Changes in version 0.0.9.1 - 2004-12-15
27193 o Bugfixes on 0.0.9:
27194 - Make hibernation actually work.
27195 - Make HashedControlPassword config option work.
27196 - When we're reporting event circuit status to a controller,
27197 don't use the stream status code.
27200 Changes in version 0.0.9 - 2004-12-12
27201 o Bugfixes on 0.0.8.1 (Crashes and asserts):
27202 - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
27203 write() call will fail and we handle it there.
27204 - When we run out of disk space, or other log writing error, don't
27205 crash. Just stop logging to that log and continue.
27206 - Fix isspace() and friends so they still make Solaris happy
27207 but also so they don't trigger asserts on win32.
27208 - Fix assert failure on malformed socks4a requests.
27209 - Fix an assert bug where a hidden service provider would fail if
27210 the first hop of his rendezvous circuit was down.
27211 - Better handling of size_t vs int, so we're more robust on 64
27214 o Bugfixes on 0.0.8.1 (Win32):
27215 - Make windows sockets actually non-blocking (oops), and handle
27216 win32 socket errors better.
27217 - Fix parse_iso_time on platforms without strptime (eg win32).
27218 - win32: when being multithreaded, leave parent fdarray open.
27219 - Better handling of winsock includes on non-MSV win32 compilers.
27220 - Change our file IO stuff (especially wrt OpenSSL) so win32 is
27222 - Make unit tests work on win32.
27224 o Bugfixes on 0.0.8.1 (Path selection and streams):
27225 - Calculate timeout for waiting for a connected cell from the time
27226 we sent the begin cell, not from the time the stream started. If
27227 it took a long time to establish the circuit, we would time out
27228 right after sending the begin cell.
27229 - Fix router_compare_addr_to_addr_policy: it was not treating a port
27230 of * as always matching, so we were picking reject *:* nodes as
27231 exit nodes too. Oops.
27232 - When read() failed on a stream, we would close it without sending
27233 back an end. So 'connection refused' would simply be ignored and
27234 the user would get no response.
27235 - Stop a sigpipe: when an 'end' cell races with eof from the app,
27236 we shouldn't hold-open-until-flush if the eof arrived first.
27237 - Let resolve conns retry/expire also, rather than sticking around
27239 - Fix more dns related bugs: send back resolve_failed and end cells
27240 more reliably when the resolve fails, rather than closing the
27241 circuit and then trying to send the cell. Also attach dummy resolve
27242 connections to a circuit *before* calling dns_resolve(), to fix
27243 a bug where cached answers would never be sent in RESOLVED cells.
27245 o Bugfixes on 0.0.8.1 (Circuits):
27246 - Finally fix a bug that's been plaguing us for a year:
27247 With high load, circuit package window was reaching 0. Whenever
27248 we got a circuit-level sendme, we were reading a lot on each
27249 socket, but only writing out a bit. So we would eventually reach
27250 eof. This would be noticed and acted on even when there were still
27251 bytes sitting in the inbuf.
27252 - Use identity comparison, not nickname comparison, to choose which
27253 half of circuit-ID-space each side gets to use. This is needed
27254 because sometimes we think of a router as a nickname, and sometimes
27255 as a hex ID, and we can't predict what the other side will do.
27257 o Bugfixes on 0.0.8.1 (Other):
27258 - Fix a whole slew of memory leaks.
27259 - Disallow NDEBUG. We don't ever want anybody to turn off debug.
27260 - If we are using select, make sure we stay within FD_SETSIZE.
27261 - When poll() is interrupted, we shouldn't believe the revents values.
27262 - Add a FAST_SMARTLIST define to optionally inline smartlist_get
27263 and smartlist_len, which are two major profiling offenders.
27264 - If do_hup fails, actually notice.
27265 - Flush the log file descriptor after we print "Tor opening log file",
27266 so we don't see those messages days later.
27267 - Hidden service operators now correctly handle version 1 style
27268 INTRODUCE1 cells (nobody generates them still, so not a critical
27270 - Handle more errnos from accept() without closing the listener.
27271 Some OpenBSD machines were closing their listeners because
27272 they ran out of file descriptors.
27273 - Some people had wrapped their tor client/server in a script
27274 that would restart it whenever it died. This did not play well
27275 with our "shut down if your version is obsolete" code. Now people
27276 don't fetch a new directory if their local cached version is
27278 - Make our autogen.sh work on ksh as well as bash.
27279 - Better torrc example lines for dirbindaddress and orbindaddress.
27280 - Improved bounds checking on parsed ints (e.g. config options and
27281 the ones we find in directories.)
27282 - Stop using separate defaults for no-config-file and
27283 empty-config-file. Now you have to explicitly turn off SocksPort,
27284 if you don't want it open.
27285 - We were starting to daemonize before we opened our logs, so if
27286 there were any problems opening logs, we would complain to stderr,
27287 which wouldn't work, and then mysteriously exit.
27288 - If a verified OR connects to us before he's uploaded his descriptor,
27289 or we verify him and hup but he still has the original TLS
27290 connection, then conn->nickname is still set like he's unverified.
27292 o Code security improvements, inspired by Ilja:
27293 - tor_snprintf wrapper over snprintf with consistent (though not C99)
27295 - Replace sprintf with tor_snprintf. (I think they were all safe, but
27297 - Replace strcpy/strncpy with strlcpy in more places.
27298 - Avoid strcat; use tor_snprintf or strlcat instead.
27300 o Features (circuits and streams):
27301 - New circuit building strategy: keep a list of ports that we've
27302 used in the past 6 hours, and always try to have 2 circuits open
27303 or on the way that will handle each such port. Seed us with port
27304 80 so web users won't complain that Tor is "slow to start up".
27305 - Make kill -USR1 dump more useful stats about circuits.
27306 - When warning about retrying or giving up, print the address, so
27307 the user knows which one it's talking about.
27308 - If you haven't used a clean circuit in an hour, throw it away,
27309 just to be on the safe side. (This means after 6 hours a totally
27310 unused Tor client will have no circuits open.)
27311 - Support "foo.nickname.exit" addresses, to let Alice request the
27312 address "foo" as viewed by exit node "nickname". Based on a patch
27313 from Geoff Goodell.
27314 - If your requested entry or exit node has advertised bandwidth 0,
27316 - Be more greedy about filling up relay cells -- we try reading again
27317 once we've processed the stuff we read, in case enough has arrived
27318 to fill the last cell completely.
27319 - Refuse application socks connections to port 0.
27320 - Use only 0.0.9pre1 and later servers for resolve cells.
27322 o Features (bandwidth):
27323 - Hibernation: New config option "AccountingMax" lets you
27324 set how many bytes per month (in each direction) you want to
27325 allow your server to consume. Rather than spreading those
27326 bytes out evenly over the month, we instead hibernate for some
27327 of the month and pop up at a deterministic time, work until
27328 the bytes are consumed, then hibernate again. Config option
27329 "MonthlyAccountingStart" lets you specify which day of the month
27330 your billing cycle starts on.
27331 - Implement weekly/monthly/daily accounting: now you specify your
27332 hibernation properties by
27333 AccountingMax N bytes|KB|MB|GB|TB
27334 AccountingStart day|week|month [day] HH:MM
27335 Defaults to "month 1 0:00".
27336 - Let bandwidth and interval config options be specified as 5 bytes,
27337 kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
27339 o Features (directories):
27340 - New "router-status" line in directory, to better bind each verified
27341 nickname to its identity key.
27342 - Clients can ask dirservers for /dir.z to get a compressed version
27343 of the directory. Only works for servers running 0.0.9, of course.
27344 - Make clients cache directories and use them to seed their router
27345 lists at startup. This means clients have a datadir again.
27346 - Respond to content-encoding headers by trying to uncompress as
27348 - Clients and servers now fetch running-routers; cache
27349 running-routers; compress running-routers; serve compressed
27351 - Make moria2 advertise a dirport of 80, so people behind firewalls
27352 will be able to get a directory.
27353 - Http proxy support
27354 - Dirservers translate requests for http://%s:%d/x to /x
27355 - You can specify "HttpProxy %s[:%d]" and all dir fetches will
27356 be routed through this host.
27357 - Clients ask for /tor/x rather than /x for new enough dirservers.
27358 This way we can one day coexist peacefully with apache.
27359 - Clients specify a "Host: %s%d" http header, to be compatible
27360 with more proxies, and so running squid on an exit node can work.
27361 - Protect dirservers from overzealous descriptor uploading -- wait
27362 10 seconds after directory gets dirty, before regenerating.
27364 o Features (packages and install):
27365 - Add NSI installer contributed by J Doe.
27366 - Apply NT service patch from Osamu Fujino. Still needs more work.
27367 - Commit VC6 and VC7 workspace/project files.
27368 - Commit a tor.spec for making RPM files, with help from jbash.
27369 - Add contrib/torctl.in contributed by Glenn Fink.
27370 - Make expand_filename handle ~ and ~username.
27371 - Use autoconf to enable largefile support where necessary. Use
27372 ftello where available, since ftell can fail at 2GB.
27373 - Ship src/win32/ in the tarball, so people can use it to build.
27374 - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
27377 o Features (ui controller):
27378 - Control interface: a separate program can now talk to your
27379 client/server over a socket, and get/set config options, receive
27380 notifications of circuits and streams starting/finishing/dying,
27381 bandwidth used, etc. The next step is to get some GUIs working.
27382 Let us know if you want to help out. See doc/control-spec.txt .
27383 - Ship a contrib/tor-control.py as an example script to interact
27384 with the control port.
27385 - "tor --hash-password zzyxz" will output a salted password for
27386 use in authenticating to the control interface.
27387 - Implement the control-spec's SAVECONF command, to write your
27388 configuration to torrc.
27389 - Get cookie authentication for the controller closer to working.
27390 - When set_conf changes our server descriptor, upload a new copy.
27391 But don't upload it too often if there are frequent changes.
27393 o Features (config and command-line):
27394 - Deprecate unofficial config option abbreviations, and abbreviations
27395 not on the command line.
27396 - Configuration infrastructure support for warning on obsolete
27398 - Give a slightly more useful output for "tor -h".
27399 - Break DirFetchPostPeriod into:
27400 - DirFetchPeriod for fetching full directory,
27401 - StatusFetchPeriod for fetching running-routers,
27402 - DirPostPeriod for posting server descriptor,
27403 - RendPostPeriod for posting hidden service descriptors.
27404 - New log format in config:
27405 "Log minsev[-maxsev] stdout|stderr|syslog" or
27406 "Log minsev[-maxsev] file /var/foo"
27407 - DirPolicy config option, to let people reject incoming addresses
27408 from their dirserver.
27409 - "tor --list-fingerprint" will list your identity key fingerprint
27411 - Make tor --version --version dump the cvs Id of every file.
27412 - New 'MyFamily nick1,...' config option for a server to
27413 specify other servers that shouldn't be used in the same circuit
27414 with it. Only believed if nick1 also specifies us.
27415 - New 'NodeFamily nick1,nick2,...' config option for a client to
27416 specify nodes that it doesn't want to use in the same circuit.
27417 - New 'Redirectexit pattern address:port' config option for a
27418 server to redirect exit connections, e.g. to a local squid.
27419 - Add "pass" target for RedirectExit, to make it easier to break
27420 out of a sequence of RedirectExit rules.
27421 - Make the dirservers file obsolete.
27422 - Include a dir-signing-key token in directories to tell the
27423 parsing entity which key is being used to sign.
27424 - Remove the built-in bulky default dirservers string.
27425 - New config option "Dirserver %s:%d [fingerprint]", which can be
27426 repeated as many times as needed. If no dirservers specified,
27427 default to moria1,moria2,tor26.
27428 - Make 'Routerfile' config option obsolete.
27429 - Discourage people from setting their dirfetchpostperiod more often
27430 than once per minute.
27432 o Features (other):
27433 - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
27434 get back to normal.)
27435 - Accept *:706 (silc) in default exit policy.
27436 - Implement new versioning format for post 0.1.
27437 - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
27438 log more informatively.
27439 - Check clock skew for verified servers, but allow unverified
27440 servers and clients to have any clock skew.
27441 - Make sure the hidden service descriptors are at a random offset
27442 from each other, to hinder linkability.
27443 - Clients now generate a TLS cert too, in preparation for having
27444 them act more like real nodes.
27445 - Add a pure-C tor-resolve implementation.
27446 - Use getrlimit and friends to ensure we can reach MaxConn (currently
27447 1024) file descriptors.
27448 - Raise the max dns workers from 50 to 100.
27451 Changes in version 0.0.8.1 - 2004-10-13
27453 - Fix a seg fault that can be triggered remotely for Tor
27454 clients/servers with an open dirport.
27455 - Fix a rare assert trigger, where routerinfos for entries in
27456 our cpath would expire while we're building the path.
27457 - Fix a bug in OutboundBindAddress so it (hopefully) works.
27458 - Fix a rare seg fault for people running hidden services on
27459 intermittent connections.
27460 - Fix a bug in parsing opt keywords with objects.
27461 - Fix a stale pointer assert bug when a stream detaches and
27463 - Fix a string format vulnerability (probably not exploitable)
27464 in reporting stats locally.
27465 - Fix an assert trigger: sometimes launching circuits can fail
27466 immediately, e.g. because too many circuits have failed recently.
27467 - Fix a compile warning on 64 bit platforms.
27470 Changes in version 0.0.8 - 2004-08-25
27472 - Made our unit tests compile again on OpenBSD 3.5, and tor
27473 itself compile again on OpenBSD on a sparc64.
27474 - We were neglecting milliseconds when logging on win32, so
27475 everything appeared to happen at the beginning of each second.
27476 - Check directory signature _before_ you decide whether you're
27477 you're running an obsolete version and should exit.
27478 - Check directory signature _before_ you parse the running-routers
27479 list to decide who's running.
27480 - Check return value of fclose while writing to disk, so we don't
27481 end up with broken files when servers run out of disk space.
27482 - Port it to SunOS 5.9 / Athena
27483 - Fix two bugs in saving onion keys to disk when rotating, so
27484 hopefully we'll get fewer people using old onion keys.
27485 - Remove our mostly unused -- and broken -- hex_encode()
27486 function. Use base16_encode() instead. (Thanks to Timo Lindfors
27487 for pointing out this bug.)
27488 - Only pick and establish intro points after we've gotten a
27490 - Fix assert triggers: if the other side returns an address 0.0.0.0,
27491 don't put it into the client dns cache.
27492 - If a begin failed due to exit policy, but we believe the IP
27493 address should have been allowed, switch that router to exitpolicy
27494 reject *:* until we get our next directory.
27496 o Protocol changes:
27497 - 'Extend' relay cell payloads now include the digest of the
27498 intended next hop's identity key. Now we can verify that we're
27499 extending to the right router, and also extend to routers we
27500 hadn't heard of before.
27503 - Tor nodes can now act as relays (with an advertised ORPort)
27504 without being manually verified by the dirserver operators.
27505 - Uploaded descriptors of unverified routers are now accepted
27506 by the dirservers, and included in the directory.
27507 - Verified routers are listed by nickname in the running-routers
27508 list; unverified routers are listed as "$<fingerprint>".
27509 - We now use hash-of-identity-key in most places rather than
27510 nickname or addr:port, for improved security/flexibility.
27511 - AllowUnverifiedNodes config option to let circuits choose no-name
27512 routers in entry,middle,exit,introduction,rendezvous positions.
27513 Allow middle and rendezvous positions by default.
27514 - When picking unverified routers, skip those with low uptime and/or
27515 low bandwidth, depending on what properties you care about.
27516 - ClientOnly option for nodes that never want to become servers.
27517 - Directory caching.
27518 - "AuthoritativeDir 1" option for the official dirservers.
27519 - Now other nodes (clients and servers) will cache the latest
27520 directory they've pulled down.
27521 - They can enable their DirPort to serve it to others.
27522 - Clients will pull down a directory from any node with an open
27523 DirPort, and check the signature/timestamp correctly.
27524 - Authoritative dirservers now fetch directories from other
27525 authdirservers, to stay better synced.
27526 - Running-routers list tells who's down also, along with noting
27527 if they're verified (listed by nickname) or unverified (listed
27529 - Allow dirservers to serve running-router list separately.
27530 This isn't used yet.
27531 - You can now fetch $DIRURL/running-routers to get just the
27532 running-routers line, not the whole descriptor list. (But
27533 clients don't use this yet.)
27534 - Clients choose nodes proportional to advertised bandwidth.
27535 - Clients avoid using nodes with low uptime as introduction points.
27536 - Handle servers with dynamic IP addresses: don't just replace
27537 options->Address with the resolved one at startup, and
27538 detect our address right before we make a routerinfo each time.
27539 - 'FascistFirewall' option to pick dirservers and ORs on specific
27540 ports; plus 'FirewallPorts' config option to tell FascistFirewall
27541 which ports are open. (Defaults to 80,443)
27542 - Try other dirservers immediately if the one you try is down. This
27543 should tolerate down dirservers better now.
27544 - ORs connect-on-demand to other ORs
27545 - If you get an extend cell to an OR you're not connected to,
27546 connect, handshake, and forward the create cell.
27547 - The authoritative dirservers stay connected to everybody,
27548 and everybody stays connected to 0.0.7 servers, but otherwise
27549 clients/servers expire unused connections after 5 minutes.
27550 - When servers get a sigint, they delay 30 seconds (refusing new
27551 connections) then exit. A second sigint causes immediate exit.
27552 - File and name management:
27553 - Look for .torrc if no CONFDIR "torrc" is found.
27554 - If no datadir is defined, then choose, make, and secure ~/.tor
27556 - If torrc not found, exitpolicy reject *:*.
27557 - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
27558 - If no nickname is defined, derive default from hostname.
27559 - Rename secret key files, e.g. identity.key -> secret_id_key,
27560 to discourage people from mailing their identity key to tor-ops.
27561 - Refuse to build a circuit before the directory has arrived --
27562 it won't work anyway, since you won't know the right onion keys
27564 - Parse tor version numbers so we can do an is-newer-than check
27565 rather than an is-in-the-list check.
27566 - New socks command 'resolve', to let us shim gethostbyname()
27568 - A 'tor_resolve' script to access the socks resolve functionality.
27569 - A new socks-extensions.txt doc file to describe our
27570 interpretation and extensions to the socks protocols.
27571 - Add a ContactInfo option, which gets published in descriptor.
27572 - Write tor version at the top of each log file
27573 - New docs in the tarball:
27575 - Document that you should proxy your SSL traffic too.
27576 - Log a warning if the user uses an unsafe socks variant, so people
27577 are more likely to learn about privoxy or socat.
27578 - Log a warning if you're running an unverified server, to let you
27579 know you might want to get it verified.
27580 - Change the default exit policy to reject the default edonkey,
27581 kazaa, gnutella ports.
27582 - Add replace_file() to util.[ch] to handle win32's rename().
27583 - Publish OR uptime in descriptor (and thus in directory) too.
27584 - Remember used bandwidth (both in and out), and publish 15-minute
27585 snapshots for the past day into our descriptor.
27586 - Be more aggressive about trying to make circuits when the network
27587 has changed (e.g. when you unsuspend your laptop).
27588 - Check for time skew on http headers; report date in response to
27590 - If the entrynode config line has only one node, don't pick it as
27592 - Add strict{entry|exit}nodes config options. If set to 1, then
27593 we refuse to build circuits that don't include the specified entry
27595 - OutboundBindAddress config option, to bind to a specific
27596 IP address for outgoing connect()s.
27597 - End truncated log entries (e.g. directories) with "[truncated]".
27600 Changes in version 0.0.7.3 - 2004-08-12
27601 o Stop dnsworkers from triggering an assert failure when you
27602 ask them to resolve the host "".
27605 Changes in version 0.0.7.2 - 2004-07-07
27606 o A better fix for the 0.0.0.0 problem, that will hopefully
27607 eliminate the remaining related assertion failures.
27610 Changes in version 0.0.7.1 - 2004-07-04
27611 o When an address resolves to 0.0.0.0, treat it as a failed resolve,
27612 since internally we use 0.0.0.0 to signify "not yet resolved".
27615 Changes in version 0.0.7 - 2004-06-07
27616 o Fixes for crashes and other obnoxious bugs:
27617 - Fix an epipe bug: sometimes when directory connections failed
27618 to connect, we would give them a chance to flush before closing
27620 - When we detached from a circuit because of resolvefailed, we
27621 would immediately try the same circuit twice more, and then
27622 give up on the resolve thinking we'd tried three different
27624 - Limit the number of intro circuits we'll attempt to build for a
27625 hidden service per 15-minute period.
27626 - Check recommended-software string *early*, before actually parsing
27627 the directory. Thus we can detect an obsolete version and exit,
27628 even if the new directory format doesn't parse.
27629 o Fixes for security bugs:
27630 - Remember which nodes are dirservers when you startup, and if a
27631 random OR enables his dirport, don't automatically assume he's
27632 a trusted dirserver.
27634 - Directory connections were asking the wrong poll socket to
27635 start writing, and not asking themselves to start writing.
27636 - When we detached from a circuit because we sent a begin but
27637 didn't get a connected, we would use it again the first time;
27638 but after that we would correctly switch to a different one.
27639 - Stop warning when the first onion decrypt attempt fails; they
27640 will sometimes legitimately fail now that we rotate keys.
27641 - Override unaligned-access-ok check when $host_cpu is ia64 or
27642 arm. Apparently they allow it but the kernel whines.
27643 - Dirservers try to reconnect periodically too, in case connections
27645 - Fix some memory leaks in directory servers.
27646 - Allow backslash in Win32 filenames.
27647 - Made Tor build complain-free on FreeBSD, hopefully without
27648 breaking other BSD builds. We'll see.
27649 - Check directory signatures based on name of signer, not on whom
27650 we got the directory from. This will let us cache directories more
27652 - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
27655 - Doxygen markup on all functions and global variables.
27656 - Make directory functions update routerlist, not replace it. So
27657 now directory disagreements are not so critical a problem.
27658 - Remove the upper limit on number of descriptors in a dirserver's
27659 directory (not that we were anywhere close).
27660 - Allow multiple logfiles at different severity ranges.
27661 - Allow *BindAddress to specify ":port" rather than setting *Port
27662 separately. Allow multiple instances of each BindAddress config
27663 option, so you can bind to multiple interfaces if you want.
27664 - Allow multiple exit policy lines, which are processed in order.
27665 Now we don't need that huge line with all the commas in it.
27666 - Enable accept/reject policies on SOCKS connections, so you can bind
27667 to 0.0.0.0 but still control who can use your OP.
27668 - Updated the man page to reflect these features.
27671 Changes in version 0.0.6.2 - 2004-05-16
27672 o Our integrity-checking digest was checking only the most recent cell,
27673 not the previous cells like we'd thought.
27674 Thanks to Stefan Mark for finding the flaw!
27677 Changes in version 0.0.6.1 - 2004-05-06
27678 o Fix two bugs in our AES counter-mode implementation (this affected
27679 onion-level stream encryption, but not TLS-level). It turns
27680 out we were doing something much more akin to a 16-character
27681 polyalphabetic cipher. Oops.
27682 Thanks to Stefan Mark for finding the flaw!
27683 o Retire moria3 as a directory server, and add tor26 as a directory
27687 Changes in version 0.0.6 - 2004-05-02
27689 - Hidden services and rendezvous points are implemented. Go to
27690 http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
27691 hidden services. (This only works via a socks4a proxy such as
27692 Privoxy, and currently it's quite slow.)
27693 - We now rotate link (tls context) keys and onion keys.
27694 - CREATE cells now include oaep padding, so you can tell
27695 if you decrypted them correctly.
27696 - Retry stream correctly when we fail to connect because of
27697 exit-policy-reject (should try another) or can't-resolve-address.
27698 - When we hup a dirserver and we've *removed* a server from the
27699 approved-routers list, now we remove that server from the
27700 in-memory directories too.
27701 - Add bandwidthburst to server descriptor.
27702 - Directories now say which dirserver signed them.
27703 - Use a tor_assert macro that logs failed assertions too.
27704 - Since we don't support truncateds much, don't bother sending them;
27705 just close the circ.
27706 - Fetch randomness from /dev/urandom better (not via fopen/fread)
27707 - Better debugging for tls errors
27708 - Set Content-Type on the directory and hidserv descriptor.
27709 - Remove IVs from cipher code, since AES-ctr has none.
27711 - Fix an assert trigger for exit nodes that's been plaguing us since
27712 the days of 0.0.2prexx (thanks weasel!)
27713 - Fix a bug where we were closing tls connections intermittently.
27714 It turns out openssl keeps its errors around -- so if an error
27715 happens, and you don't ask about it, and then another openssl
27716 operation happens and succeeds, and you ask if there was an error,
27717 it tells you about the first error.
27718 - Fix a bug that's been lurking since 27 may 03 (!)
27719 When passing back a destroy cell, we would use the wrong circ id.
27720 - Don't crash if a conn that sent a begin has suddenly lost its circuit.
27721 - Some versions of openssl have an SSL_pending function that erroneously
27722 returns bytes when there is a non-application record pending.
27723 - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
27724 o We were using an array of length zero in a few places.
27725 o Win32's gethostbyname can't resolve an IP to an IP.
27726 o Win32's close can't close a socket.
27727 o Handle windows socket errors correctly.
27729 - check for <sys/limits.h> so we build on FreeBSD again, and
27730 <machine/limits.h> for NetBSD.
27733 Changes in version 0.0.5 - 2004-03-30
27734 o Install torrc as torrc.sample -- we no longer clobber your
27736 o Fix mangled-state bug in directory fetching (was causing sigpipes).
27737 o Only build circuits after we've fetched the directory: clients were
27738 using only the directory servers before they'd fetched a directory.
27739 This also means longer startup time; so it goes.
27740 o Fix an assert trigger where an OP would fail to handshake, and we'd
27741 expect it to have a nickname.
27742 o Work around a tsocks bug: do a socks reject when AP connection dies
27743 early, else tsocks goes into an infinite loop.
27744 o Hold socks connection open until reply is flushed (if possible)
27745 o Make exit nodes resolve IPs to IPs immediately, rather than asking
27746 the dns farm to do it.
27747 o Fix c99 aliasing warnings in rephist.c
27748 o Don't include server descriptors that are older than 24 hours in the
27750 o Give socks 'reject' replies their whole 15s to attempt to flush,
27751 rather than seeing the 60s timeout and assuming the flush had failed.
27752 o Clean automake droppings from the cvs repository
27753 o Add in a 'notice' log level for things the operator should hear
27754 but that aren't warnings
27757 Changes in version 0.0.4 - 2004-03-26
27758 o When connecting to a dirserver or OR and the network is down,
27762 Changes in version 0.0.3 - 2004-03-26
27763 o Warn and fail if server chose a nickname with illegal characters
27764 o Port to Solaris and Sparc:
27765 - include missing header fcntl.h
27766 - have autoconf find -lsocket -lnsl automatically
27767 - deal with hardware word alignment
27768 - make uname() work (solaris has a different return convention)
27769 - switch from using signal() to sigaction()
27770 o Preliminary work on reputation system:
27771 - Keep statistics on success/fail of connect attempts; they're published
27772 by kill -USR1 currently.
27773 - Add a RunTesting option to try to learn link state by creating test
27774 circuits, even when SocksPort is off.
27775 - Remove unused open circuits when there are too many.
27778 Changes in version 0.0.2 - 2004-03-19
27779 - Include strlcpy and strlcat for safer string ops
27780 - define INADDR_NONE so we compile (but still not run) on solaris
27783 Changes in version 0.0.2pre27 - 2004-03-14
27785 - Allow internal tor networks (we were rejecting internal IPs,
27786 now we allow them if they're set explicitly).
27787 - And fix a few endian issues.
27790 Changes in version 0.0.2pre26 - 2004-03-14
27792 - If a stream times out after 15s without a connected cell, don't
27793 try that circuit again: try a new one.
27794 - Retry streams at most 4 times. Then give up.
27795 - When a dirserver gets a descriptor from an unknown router, it
27796 logs its fingerprint (so the dirserver operator can choose to
27797 accept it even without mail from the server operator).
27798 - Inform unapproved servers when we reject their descriptors.
27799 - Make tor build on Windows again. It works as a client, who knows
27801 - Clearer instructions in the torrc for how to set up a server.
27802 - Be more efficient about reading fd's when our global token bucket
27803 (used for rate limiting) becomes empty.
27805 - Stop asserting that computers always go forward in time. It's
27807 - When we sent a cell (e.g. destroy) and then marked an OR connection
27808 expired, we might close it before finishing a flush if the other
27809 side isn't reading right then.
27810 - Don't allow dirservers to start if they haven't defined
27811 RecommendedVersions
27812 - We were caching transient dns failures. Oops.
27813 - Prevent servers from publishing an internal IP as their address.
27814 - Address a strcat vulnerability in circuit.c
27817 Changes in version 0.0.2pre25 - 2004-03-04
27819 - Put the OR's IP in its router descriptor, not its fqdn. That way
27820 we'll stop being stalled by gethostbyname for nodes with flaky dns,
27823 - If the user typed in an address that didn't resolve, the server
27827 Changes in version 0.0.2pre24 - 2004-03-03
27829 - Fix an assertion failure in dns.c, where we were trying to dequeue
27830 a pending dns resolve even if it wasn't pending
27831 - Fix a spurious socks5 warning about still trying to write after the
27832 connection is finished.
27833 - Hold certain marked_for_close connections open until they're finished
27834 flushing, rather than losing bytes by closing them too early.
27835 - Correctly report the reason for ending a stream
27836 - Remove some duplicate calls to connection_mark_for_close
27837 - Put switch_id and start_daemon earlier in the boot sequence, so it
27838 will actually try to chdir() to options.DataDirectory
27839 - Make 'make test' exit(1) if a test fails; fix some unit tests
27840 - Make tor fail when you use a config option it doesn't know about,
27841 rather than warn and continue.
27842 - Make --version work
27843 - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
27846 Changes in version 0.0.2pre23 - 2004-02-29
27848 - Print a statement when the first circ is finished, so the user
27849 knows it's working.
27850 - If a relay cell is unrecognized at the end of the circuit,
27851 send back a destroy. (So attacks to mutate cells are more
27853 - New config option 'excludenodes' to avoid certain nodes for circuits.
27854 - When it daemonizes, it chdir's to the DataDirectory rather than "/",
27855 so you can collect coredumps there.
27857 - Fix a bug in tls flushing where sometimes data got wedged and
27858 didn't flush until more data got sent. Hopefully this bug was
27859 a big factor in the random delays we were seeing.
27860 - Make 'connected' cells include the resolved IP, so the client
27861 dns cache actually gets populated.
27862 - Disallow changing from ORPort=0 to ORPort>0 on hup.
27863 - When we time-out on a stream and detach from the circuit, send an
27864 end cell down it first.
27865 - Only warn about an unknown router (in exitnodes, entrynodes,
27866 excludenodes) after we've fetched a directory.
27869 Changes in version 0.0.2pre22 - 2004-02-26
27871 - Servers publish less revealing uname information in descriptors.
27872 - More memory tracking and assertions, to crash more usefully when
27874 - If the default torrc isn't there, just use some default defaults.
27875 Plus provide an internal dirservers file if they don't have one.
27876 - When the user tries to use Tor as an http proxy, give them an http
27877 501 failure explaining that we're a socks proxy.
27878 - Dump a new router.desc on hup, to help confused people who change
27879 their exit policies and then wonder why router.desc doesn't reflect
27881 - Clean up the generic tor.sh init script that we ship with.
27883 - If the exit stream is pending on the resolve, and a destroy arrives,
27884 then the stream wasn't getting removed from the pending list. I
27885 think this was the one causing recent server crashes.
27886 - Use a more robust poll on OSX 10.3, since their poll is flaky.
27887 - When it couldn't resolve any dirservers, it was useless from then on.
27888 Now it reloads the RouterFile (or default dirservers) if it has no
27890 - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
27891 many users don't even *have* a /usr/local/sbin/.
27894 Changes in version 0.0.2pre21 - 2004-02-18
27896 - There's a ChangeLog file that actually reflects the changelog.
27897 - There's a 'torify' wrapper script, with an accompanying
27898 tor-tsocks.conf, that simplifies the process of using tsocks for
27899 tor. It even has a man page.
27900 - The tor binary gets installed to sbin rather than bin now.
27901 - Retry streams where the connected cell hasn't arrived in 15 seconds
27902 - Clean up exit policy handling -- get the default out of the torrc,
27903 so we can update it without forcing each server operator to fix
27905 - Allow imaps and pop3s in default exit policy
27907 - Prevent picking middleman nodes as the last node in the circuit
27910 Changes in version 0.0.2pre20 - 2004-01-30
27912 - We now have a deb package, and it's in debian unstable. Go to
27913 it, apt-getters. :)
27914 - I've split the TotalBandwidth option into BandwidthRate (how many
27915 bytes per second you want to allow, long-term) and
27916 BandwidthBurst (how many bytes you will allow at once before the cap
27917 kicks in). This better token bucket approach lets you, say, set
27918 BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
27919 performance while not exceeding your monthly bandwidth quota.
27920 - Push out a tls record's worth of data once you've got it, rather
27921 than waiting until you've read everything waiting to be read. This
27922 may improve performance by pipelining better. We'll see.
27923 - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
27924 from failed circuits (if they haven't been connected yet) and attach
27926 - Expire old streams that haven't managed to connect. Some day we'll
27927 have them reattach to new circuits instead.
27930 - Fix several memory leaks that were causing servers to become bloated
27932 - Fix a few very rare assert triggers. A few more remain.
27933 - Setuid to User _before_ complaining about running as root.
27936 Changes in version 0.0.2pre19 - 2004-01-07
27938 - Fix deadlock condition in dns farm. We were telling a child to die by
27939 closing the parent's file descriptor to him. But newer children were
27940 inheriting the open file descriptor from the parent, and since they
27941 weren't closing it, the socket never closed, so the child never read
27942 eof, so he never knew to exit. Similarly, dns workers were holding
27943 open other sockets, leading to all sorts of chaos.
27944 - New cleaner daemon() code for forking and backgrounding.
27945 - If you log to a file, it now prints an entry at the top of the
27946 logfile so you know it's working.
27947 - The onionskin challenge length was 30 bytes longer than necessary.
27948 - Started to patch up the spec so it's not quite so out of date.
27951 Changes in version 0.0.2pre18 - 2004-01-02
27953 - Fix endian issues with the 'integrity' field in the relay header.
27954 - Fix a potential bug where connections in state
27955 AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
27958 Changes in version 0.0.2pre17 - 2003-12-30
27960 - Made --debuglogfile (or any second log file, actually) work.
27961 - Resolved an edge case in get_unique_circ_id_by_conn where a smart
27962 adversary could force us into an infinite loop.
27965 - Each onionskin handshake now includes a hash of the computed key,
27966 to prove the server's identity and help perfect forward secrecy.
27967 - Changed cell size from 256 to 512 bytes (working toward compatibility
27969 - Changed cell length to 2 bytes, and moved it to the relay header.
27970 - Implemented end-to-end integrity checking for the payloads of
27972 - Separated streamid from 'recognized' (otherwise circuits will get
27973 messed up when we try to have streams exit from the middle). We
27974 use the integrity-checking to confirm that a cell is addressed to
27976 - Randomize the initial circid and streamid values, so an adversary who
27977 breaks into a node can't learn how many circuits or streams have
27981 Changes in version 0.0.2pre16 - 2003-12-14
27983 - Fixed a bug that made HUP trigger an assert
27984 - Fixed a bug where a circuit that immediately failed wasn't being
27985 counted as a failed circuit in counting retries.
27988 - Now we close the circuit when we get a truncated cell: otherwise we're
27989 open to an anonymity attack where a bad node in the path truncates
27990 the circuit and then we open streams at him.
27991 - Add port ranges to exit policies
27992 - Add a conservative default exit policy
27993 - Warn if you're running tor as root
27994 - on HUP, retry OR connections and close/rebind listeners
27995 - options.EntryNodes: try these nodes first when picking the first node
27996 - options.ExitNodes: if your best choices happen to include any of
27997 your preferred exit nodes, you choose among just those preferred
27999 - options.ExcludedNodes: nodes that are never picked in path building
28002 Changes in version 0.0.2pre15 - 2003-12-03
28003 o Robustness and bugfixes:
28004 - Sometimes clients would cache incorrect DNS resolves, which would
28005 really screw things up.
28006 - An OP that goes offline would slowly leak all its sockets and stop
28008 - A wide variety of bugfixes in exit node selection, exit policy
28009 handling, and processing pending streams when a new circuit is
28011 - Pick nodes for a path only from those the directory says are up
28012 - Choose randomly from all running dirservers, not always the first one
28013 - Increase allowed http header size for directory fetch.
28014 - Stop writing to stderr (if we're daemonized it will be closed).
28015 - Enable -g always, so cores will be more useful to me.
28016 - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
28019 - Wrote a man page. It lists commonly used options.
28022 - Change default loglevel to warn.
28023 - Make PidFile default to null rather than littering in your CWD.
28024 - OnionRouter config option is now obsolete. Instead it just checks
28026 - Moved to a single unified torrc file for both clients and servers.
28029 Changes in version 0.0.2pre14 - 2003-11-29
28030 o Robustness and bugfixes:
28031 - Force the admin to make the DataDirectory himself
28032 - to get ownership/permissions right
28033 - so clients no longer make a DataDirectory and then never use it
28034 - fix bug where a client who was offline for 45 minutes would never
28035 pull down a directory again
28036 - fix (or at least hide really well) the dns assert bug that was
28037 causing server crashes
28038 - warnings and improved robustness wrt clockskew for certs
28039 - use the native daemon(3) to daemonize, when available
28040 - exit if bind() fails
28041 - exit if neither socksport nor orport is defined
28042 - include our own tor_timegm (Win32 doesn't have its own)
28043 - bugfix for win32 with lots of connections
28044 - fix minor bias in PRNG
28045 - make dirserver more robust to corrupt cached directory
28048 - Wrote the design document (woo)
28050 o Circuit building and exit policies:
28051 - Circuits no longer try to use nodes that the directory has told them
28053 - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
28054 bitcounts (18.0.0.0/8).
28055 - Make AP connections standby for a circuit if no suitable circuit
28056 exists, rather than failing
28057 - Circuits choose exit node based on addr/port, exit policies, and
28058 which AP connections are standing by
28059 - Bump min pathlen from 2 to 3
28060 - Relay end cells have a payload to describe why the stream ended.
28061 - If the stream failed because of exit policy, try again with a new
28063 - Clients have a dns cache to remember resolved addresses.
28064 - Notice more quickly when we have no working circuits
28067 - APPort is now called SocksPort
28068 - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
28070 - RecommendedVersions is now a config variable rather than
28071 hardcoded (for dirservers)
28072 - Reloads config on HUP
28073 - Usage info on -h or --help
28074 - If you set User and Group config vars, it'll setu/gid to them.
28076 Changes in version 0.0.2pre13 - 2003-10-19
28077 o General stability:
28078 - SSL_write no longer fails when it returns WANTWRITE and the number
28079 of bytes in the buf has changed by the next SSL_write call.
28080 - Fix segfault fetching directory when network is down
28081 - Fix a variety of minor memory leaks
28082 - Dirservers reload the fingerprints file on HUP, so I don't have
28083 to take down the network when I approve a new router
28084 - Default server config file has explicit Address line to specify fqdn
28087 - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
28088 - Make listener connections not ever alloc bufs
28090 o Autoconf improvements:
28091 - don't clobber an external CFLAGS in ./configure
28092 - Make install now works
28093 - create var/lib/tor on make install
28094 - autocreate a tor.sh initscript to help distribs
28095 - autocreate the torrc and sample-server-torrc with correct paths
28097 o Log files and Daemonizing now work:
28098 - If --DebugLogFile is specified, log to it at -l debug
28099 - If --LogFile is specified, use it instead of commandline
28100 - If --RunAsDaemon is set, tor forks and backgrounds on startup