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 0.4.3.7 - 2020-11-12
6 Tor 0.4.3.7 backports several bugfixes from later releases. It
7 includes a fix for TROVE-2020-005, a security issue that could be
8 used, under certain cases, by an adversary to observe traffic patterns
9 on a limited number of circuits intended for a different relay.
11 Please be aware that support for the 0.4.3.x series will end on 15
12 February 2021. Please upgrade to 0.4.4.x or 0.4.5.x before then, or
13 downgrade to 0.3.5.x, which will be supported until at least 1
16 o Major features (fallback directory list, backport form 0.4.4.3-alpha):
17 - Replace the 148 fallback directories originally included in Tor
18 0.4.1.4-rc (of which around 105 are still functional) with a list
19 of 144 fallbacks generated in July 2020. Closes ticket 40061.
21 o Major bugfixes (security, backport from 0.4.5.1-alpha):
22 - When completing a channel, relays now check more thoroughly to
23 make sure that it matches any pending circuits before attaching
24 those circuits. Previously, address correctness and Ed25519
25 identities were not checked in this case, but only when extending
26 circuits on an existing channel. Fixes bug 40080; bugfix on
27 0.2.7.2-alpha. Resolves TROVE-2020-005.
29 o Major bugfixes (NSS, backport from 0.4.4.3-alpha):
30 - When running with NSS enabled, make sure that NSS knows to expect
31 nonblocking sockets. Previously, we set our TCP sockets as
32 nonblocking, but did not tell NSS, which in turn could lead to
33 unexpected blocking behavior. Fixes bug 40035; bugfix
36 o Minor features (security, backport from 0.4.4.4-rc):
37 - Channels using obsolete versions of the Tor link protocol are no
38 longer allowed to circumvent address-canonicity checks. (This is
39 only a minor issue, since such channels have no way to set ed25519
40 keys, and therefore should always be rejected for circuits that
41 specify ed25519 identities.) Closes ticket 40081.
43 o Minor features (subprotocol versions, backport from 0.4.5.1-alpha):
44 - Tor no longer allows subprotocol versions larger than 63.
45 Previously version numbers up to UINT32_MAX were allowed, which
46 significantly complicated our code. Implements proposal 318;
49 o Minor features (tests, backport from 0.4.4.5):
50 - Our "make check" target now runs the unit tests in 8 parallel
51 chunks. Doing this speeds up hardened CI builds by more than a
52 factor of two. Closes ticket 40098.
54 o Minor features (tests, v2 onion services, backport from 0.4.5.1-alpha):
55 - Fix a rendezvous cache unit test that was triggering an underflow
56 on the global rend cache allocation. Fixes bug 40125; bugfix
58 - Fix another rendezvous cache unit test that was triggering an
59 underflow on the global rend cache allocation. Fixes bug 40126;
60 bugfix on 0.2.8.1-alpha.
62 o Minor bugfixes (correctness, buffers, backport from 0.4.4.4-rc):
63 - Fix a correctness bug that could cause an assertion failure if we
64 ever tried using the buf_move_all() function with an empty input
65 buffer. As far as we know, no released versions of Tor do this.
66 Fixes bug 40076; bugfix on 0.3.3.1-alpha.
68 o Minor bugfixes (logging, backport from 0.4.5.1-alpha):
69 - Remove a debug logging statement that uselessly spammed the logs.
70 Fixes bug 40135; bugfix on 0.3.5.0-alpha.
72 o Minor bugfixes (rate limiting, bridges, pluggable transports, backport from 0.4.4.4-rc):
73 - On a bridge, treat all connections from an ExtORPort as remote by
74 default for the purposes of rate-limiting. Previously, bridges
75 would treat the connection as local unless they explicitly
76 received a "USERADDR" command. ExtORPort connections still count
77 as local if there is a USERADDR command with an explicit local
78 address. Fixes bug 33747; bugfix on 0.2.5.1-alpha.
80 o Minor bugfixes (relay configuration, crash, backport from 0.4.5.1-alpha):
81 - Avoid a fatal assert() when failing to create a listener
82 connection for an address that was in use. Fixes bug 40073; bugfix
85 o Minor bugfixes (relay, usability, backport from 0.4.4.3-alpha):
86 - Adjust the rules for when to warn about having too many
87 connections to other relays. Previously we'd tolerate up to 1.5
88 connections per relay on average. Now we tolerate more connections
89 for directory authorities, and raise the number of total
90 connections we need to see before we warn. Fixes bug 33880; bugfix
93 o Minor bugfixes (tests, 0.4.4.5):
94 - Fix the behavior of the rend_cache/clean_v2_descs_as_dir when run
95 on its own. Previously, it would exit with an error. Fixes bug
96 40099; bugfix on 0.2.8.1-alpha.
98 o Minor bugfixes (v2 onion services, backport from 0.4.5.1-alpha):
99 - For HSFETCH commands on v2 onion services addresses, check the
100 length of bytes decoded, not the base32 length. Fixes bug 34400;
101 bugfix on 0.4.1.1-alpha. Patch by Neel Chauhan.
103 o Minor bugfixes (windows, backport from 0.4.4.4-rc):
104 - Fix a bug that prevented Tor from starting if its log file grew
105 above 2GB. Fixes bug 31036; bugfix on 0.2.1.8-alpha.
107 o Deprecated features (onion service v2, backport form 0.4.4.2-alpha):
108 - Add a deprecation warning for version 2 onion services. Closes
111 o Removed features (backport from 0.4.4.3-alpha):
112 - Our "check-local" test target no longer tries to use the
113 Coccinelle semantic patching tool parse all the C files. While it
114 is a good idea to try to make sure Coccinelle works on our C
115 before we run a Coccinelle patch, doing so on every test run has
116 proven to be disruptive. You can still run this tool manually with
117 "make check-cocci". Closes ticket 40030. ticket 40030.
120 Changes in version 0.4.3.6 - 2020-07-09
121 Tor 0.4.3.6 backports several bugfixes from later releases, including
122 some affecting usability.
124 This release also fixes TROVE-2020-001, a medium-severity denial of
125 service vulnerability affecting all versions of Tor when compiled with
126 the NSS encryption library. (This is not the default configuration.)
127 Using this vulnerability, an attacker could cause an affected Tor
128 instance to crash remotely. This issue is also tracked as CVE-2020-
129 15572. Anybody running a version of Tor built with the NSS library
130 should upgrade to 0.3.5.11, 0.4.2.8, 0.4.3.6, or 0.4.4.2-alpha
133 o Major bugfixes (NSS, security, backport from 0.4.4.2-alpha):
134 - Fix a crash due to an out-of-bound memory access when Tor is
135 compiled with NSS support. Fixes bug 33119; bugfix on
136 0.3.5.1-alpha. This issue is also tracked as TROVE-2020-001
139 o Minor bugfix (CI, Windows, backport from 0.4.4.2-alpha):
140 - Use the correct 64-bit printf format when compiling with MINGW on
141 Appveyor. Fixes bug 40026; bugfix on 0.3.5.5-alpha.
143 o Minor bugfixes (client performance, backport from 0.4.4.1-alpha):
144 - Resume use of preemptively-built circuits when UseEntryGuards is set
145 to 0. We accidentally disabled this feature with that config
146 setting, leading to slower load times. Fixes bug 34303; bugfix
149 o Minor bugfixes (compiler warnings, backport from 0.4.4.2-alpha):
150 - Fix a compiler warning on platforms with 32-bit time_t values.
151 Fixes bug 40028; bugfix on 0.3.2.8-rc.
153 o Minor bugfixes (linux seccomp sandbox, nss, backport from 0.4.4.1-alpha):
154 - Fix a startup crash when tor is compiled with --enable-nss and
155 sandbox support is enabled. Fixes bug 34130; bugfix on
156 0.3.5.1-alpha. Patch by Daniel Pinto.
158 o Minor bugfixes (logging, backport from 0.4.4.2-alpha):
159 - Downgrade a noisy log message that could occur naturally when
160 receiving an extrainfo document that we no longer want. Fixes bug
161 16016; bugfix on 0.2.6.3-alpha.
163 o Minor bugfixes (manual page, backport from 0.4.4.1-alpha):
164 - Update the man page to reflect that MinUptimeHidServDirectoryV2
165 defaults to 96 hours. Fixes bug 34299; bugfix on 0.2.6.3-alpha.
167 o Minor bugfixes (onion service v3, backport from 0.4.4.1-alpha):
168 - Prevent an assert() that would occur when cleaning the client
169 descriptor cache, and attempting to close circuits for a non-
170 decrypted descriptor (lacking client authorization). Fixes bug
171 33458; bugfix on 0.4.2.1-alpha.
173 o Minor bugfixes (portability, backport from 0.4.4.1-alpha):
174 - Fix a portability error in the configure script, where we were
175 using "==" instead of "=". Fixes bug 34233; bugfix on 0.4.3.5.
177 o Minor bugfixes (relays, backport from 0.4.4.1-alpha):
178 - Stop advertising incorrect IPv6 ORPorts in relay and bridge
179 descriptors, when the IPv6 port was configured as "auto". Fixes
180 bug 32588; bugfix on 0.2.3.9-alpha.
182 o Documentation (backport from 0.4.4.1-alpha):
183 - Fix several doxygen warnings related to imbalanced groups. Closes
187 Changes in version 0.4.3.5 - 2020-05-15
188 Tor 0.4.3.5 is the first stable release in the 0.4.3.x series. This
189 series adds support for building without relay code enabled, and
190 implements functionality needed for OnionBalance with v3 onion
191 services. It includes significant refactoring of our configuration and
192 controller functionality, and fixes numerous smaller bugs and
195 Per our support policy, we support each stable release series for nine
196 months after its first stable release, or three months after the first
197 stable release of the next series: whichever is longer. This means
198 that 0.4.3.x will be supported until around February 2021--later, if
199 0.4.4.x is later than anticipated.
201 Note also that support for 0.4.1.x is about to end on May 20 of this
202 year; 0.4.2.x will be supported until September 15. We still plan to
203 continue supporting 0.3.5.x, our long-term stable series, until
206 Below are the changes since 0.4.2.6. For a list of only the changes
207 since 0.4.3.4-rc, see the ChangeLog file.
209 o New system requirements:
210 - When building Tor, you now need to have Python 3 in order to run
211 the integration tests. (Python 2 is officially unsupported
212 upstream, as of 1 Jan 2020.) Closes ticket 32608.
214 o Major features (build system):
215 - The relay code can now be disabled using the --disable-module-relay
216 configure option. When this option is set, we also disable the
217 dirauth module. Closes ticket 32123.
218 - When Tor is compiled --disable-module-relay, we also omit the code
219 used to act as a directory cache. Closes ticket 32487.
221 o Major features (directory authority, ed25519):
222 - Add support for banning a relay's ed25519 keys in the approved-
223 routers file. This will help us migrate away from RSA keys in the
224 future. Previously, only RSA keys could be banned in approved-
225 routers. Resolves ticket 22029. Patch by Neel Chauhan.
227 o Major features (onion services):
228 - New control port commands to manage client-side onion service
229 authorization credentials. The ONION_CLIENT_AUTH_ADD command adds
230 a credential, ONION_CLIENT_AUTH_REMOVE deletes a credential, and
231 ONION_CLIENT_AUTH_VIEW lists the credentials. Closes ticket 30381.
232 - Introduce a new SocksPort flag, ExtendedErrors, to support more
233 detailed error codes in information for applications that support
234 them. Closes ticket 30382; implements proposal 304.
236 o Major features (proxy):
237 - In addition to its current supported proxy types (HTTP CONNECT,
238 SOCKS4, and SOCKS5), Tor can now make its OR connections through a
239 HAProxy server. A new torrc option was added to specify the
240 address/port of the server: TCPProxy <protocol> <host>:<port>.
241 Currently the only supported protocol for the option is haproxy.
242 Closes ticket 31518. Patch done by Suphanat Chunhapanya (haxxpop).
244 o Major bugfixes (security, denial-of-service):
245 - Fix a denial-of-service bug that could be used by anyone to
246 consume a bunch of CPU on any Tor relay or authority, or by
247 directories to consume a bunch of CPU on clients or hidden
248 services. Because of the potential for CPU consumption to
249 introduce observable timing patterns, we are treating this as a
250 high-severity security issue. Fixes bug 33119; bugfix on
251 0.2.1.5-alpha. Found by OSS-Fuzz. We are also tracking this issue
252 as TROVE-2020-002 and CVE-2020-10592.
254 o Major bugfixes (circuit padding, memory leak):
255 - Avoid a remotely triggered memory leak in the case that a circuit
256 padding machine is somehow negotiated twice on the same circuit.
257 Fixes bug 33619; bugfix on 0.4.0.1-alpha. Found by Tobias Pulls.
258 This is also tracked as TROVE-2020-004 and CVE-2020-10593.
260 o Major bugfixes (directory authority):
261 - Directory authorities will now send a 503 (not enough bandwidth)
262 code to clients when under bandwidth pressure. Known relays and
263 other authorities will always be answered regardless of the
264 bandwidth situation. Fixes bug 33029; bugfix on 0.1.2.5-alpha.
266 o Major bugfixes (DoS defenses, bridges, pluggable transport):
267 - Fix a bug that was preventing DoS defenses from running on bridges
268 with a pluggable transport. Previously, the DoS subsystem was not
269 given the transport name of the client connection, thus failed to
270 find the GeoIP cache entry for that client address. Fixes bug
271 33491; bugfix on 0.3.3.2-alpha.
273 o Major bugfixes (networking):
274 - Correctly handle IPv6 addresses in SOCKS5 RESOLVE_PTR requests,
275 and accept strings as well as binary addresses. Fixes bug 32315;
276 bugfix on 0.3.5.1-alpha.
278 o Major bugfixes (onion service):
279 - Report HS circuit failure back into the HS subsystem so we take
280 appropriate action with regards to the client introduction point
281 failure cache. This improves reachability of onion services, since
282 now clients notice failing introduction circuits properly. Fixes
283 bug 32020; bugfix on 0.3.2.1-alpha.
285 o Minor feature (heartbeat, onion service):
286 - Add the DoS INTRODUCE2 defenses counter to the heartbeat DoS
287 message. Closes ticket 31371.
289 o Minor feature (sendme, flow control):
290 - Default to sending SENDME version 1 cells. (Clients are already
291 sending these, because of a consensus parameter telling them to do
292 so: this change only affects what clients would do if the
293 consensus didn't contain a recommendation.) Closes ticket 33623.
295 o Minor features (best practices tracker):
296 - Practracker now supports a --regen-overbroad option to regenerate
297 the exceptions file, but only to revise exceptions to be _less_
298 tolerant of best-practices violations. Closes ticket 32372.
300 o Minor features (configuration validation):
301 - Configuration validation can now be done by per-module callbacks,
302 rather than a global validation function. This will let us reduce
303 the size of config.c and some of its more cumbersome functions.
306 o Minor features (configuration):
307 - If a configured hardware crypto accelerator in AccelName is
308 prefixed with "!", Tor now exits when it cannot be found. Closes
310 - We now use flag-driven logic to warn about obsolete configuration
311 fields, so that we can include their names. In 0.4.2, we used a
312 special type, which prevented us from generating good warnings.
313 Implements ticket 32404.
315 o Minor features (configure, build system):
316 - Output a list of enabled/disabled features at the end of the
317 configure process in a pleasing way. Closes ticket 31373.
319 o Minor features (continuous integration):
320 - Run Doxygen Makefile target on Travis, so we can learn about
321 regressions in our internal documentation. Closes ticket 32455.
322 - Stop allowing failures on the Travis CI stem tests job. It looks
323 like all the stem hangs we were seeing before are now fixed.
326 o Minor features (controller):
327 - Add stream isolation data to STREAM event. Closes ticket 19859.
328 - Implement a new GETINFO command to fetch microdescriptor
329 consensus. Closes ticket 31684.
331 o Minor features (debugging, directory system):
332 - Don't crash when we find a non-guard with a guard-fraction value
333 set. Instead, log a bug warning, in an attempt to figure out how
334 this happened. Diagnostic for ticket 32868.
336 o Minor features (defense in depth):
337 - Add additional checks around tor_vasprintf() usage, in case the
338 function returns an error. Patch by Tobias Stoeckmann. Fixes
341 o Minor features (developer tools):
342 - Remove the 0.2.9.x series branches from git scripts (git-merge-
343 forward.sh, git-pull-all.sh, git-push-all.sh, git-setup-dirs.sh).
345 - Add a check_cocci_parse.sh script that checks that new code is
346 parseable by Coccinelle. Add an exceptions file for unparseable
347 files, and run the script from travis CI. Closes ticket 31919.
348 - Call the check_cocci_parse.sh script from a 'check-cocci' Makefile
349 target. Closes ticket 31919.
350 - Add a rename_c_identifiers.py tool to rename a bunch of C
351 identifiers at once, and generate a well-formed commit message
352 describing the change. This should help with refactoring. Closes
354 - Add some scripts in "scripts/coccinelle" to invoke the Coccinelle
355 semantic patching tool with the correct flags. These flags are
356 fairly easy to forget, and these scripts should help us use
357 Coccinelle more effectively in the future. Closes ticket 31705.
359 o Minor features (diagnostic):
360 - Improve assertions and add some memory-poisoning code to try to
361 track down possible causes of a rare crash (32564) in the EWMA
362 code. Closes ticket 33290.
364 o Minor features (directory authorities):
365 - Directory authorities now reject descriptors from relays running
366 Tor versions from the 0.2.9 and 0.4.0 series. The 0.3.5 series is
367 still allowed. Resolves ticket 32672. Patch by Neel Chauhan.
369 o Minor features (Doxygen):
370 - Update Doxygen configuration file to a more recent template (from
371 1.8.15). Closes ticket 32110.
372 - "make doxygen" now works with out-of-tree builds. Closes
374 - Make sure that doxygen outputs documentation for all of our C
375 files. Previously, some were missing @file declarations, causing
376 them to be ignored. Closes ticket 32307.
377 - Our "make doxygen" target now respects --enable-fatal-warnings by
378 default, and does not warn about items that are missing
379 documentation. To warn about missing documentation, run configure
380 with the "--enable-missing-doc-warnings" flag: doing so suspends
381 fatal warnings for doxygen. Closes ticket 32385.
383 o Minor features (git scripts):
384 - Add TOR_EXTRA_CLONE_ARGS to git-setup-dirs.sh for git clone
385 customisation. Closes ticket 32347.
386 - Add git-setup-dirs.sh, which sets up an upstream git repository
387 and worktrees for tor maintainers. Closes ticket 29603.
388 - Add TOR_EXTRA_REMOTE_* to git-setup-dirs.sh for a custom extra
389 remote. Closes ticket 32347.
390 - Call the check_cocci_parse.sh script from the git commit and push
391 hooks. Closes ticket 31919.
392 - Make git-push-all.sh skip unchanged branches when pushing to
393 upstream. The script already skipped unchanged test branches.
395 - Make git-setup-dirs.sh create a master symlink in the worktree
396 directory. Closes ticket 32347.
397 - Skip unmodified source files when doing some existing git hook
398 checks. Related to ticket 31919.
400 o Minor features (IPv6, client):
401 - Make Tor clients tell dual-stack exits that they prefer IPv6
402 connections. This change is equivalent to setting the PreferIPv6
403 flag on SOCKSPorts (and most other listener ports). Tor Browser
404 has been setting this flag for some time, and we want to remove a
405 client distinguisher at exits. Closes ticket 32637.
407 o Minor features (portability, android):
408 - When building for Android, disable some tests that depend on $HOME
409 and/or pwdb, which Android doesn't have. Closes ticket 32825.
410 Patch from Hans-Christoph Steiner.
412 o Minor features (relay modularity):
413 - Split the relay and server pluggable transport config code into
414 separate files in the relay module. Disable this code when the
415 relay module is disabled. Closes part of ticket 32213.
416 - When the relay module is disabled, reject attempts to set the
417 ORPort, DirPort, DirCache, BridgeRelay, ExtORPort, or
418 ServerTransport* options, rather than ignoring the values of these
419 options. Closes part of ticket 32213.
420 - When the relay module is disabled, change the default config so
421 that DirCache is 0, and ClientOnly is 1. Closes ticket 32410.
423 o Minor features (release tools):
424 - Port our ChangeLog formatting and sorting tools to Python 3.
427 o Minor features (testing):
428 - The unit tests now support a "TOR_SKIP_TESTCASES" environment
429 variable to specify a list of space-separated test cases that
430 should not be executed. We will use this to disable certain tests
431 that are failing on Appveyor because of mismatched OpenSSL
432 libraries. Part of ticket 33643.
433 - Detect some common failure cases for test_parseconf.sh in
434 src/test/conf_failures. Closes ticket 32451.
435 - Allow test_parseconf.sh to test expected log outputs for successful
436 configs, as well as failed configs. Closes ticket 32451.
437 - The test_parseconf.sh script now supports result variants for any
438 combination of the optional libraries lzma, nss, and zstd. Closes
440 - When running the unit tests on Android, create temporary files in
441 a subdirectory of /data/local/tmp. Closes ticket 32172. Based on a
442 patch from Hans-Christoph Steiner.
444 o Minor features (usability):
445 - Include more information when failing to parse a configuration
446 value. This should make it easier to tell what's going wrong when
447 a configuration file doesn't parse. Closes ticket 33460.
449 o Minor bugfix (relay, configuration):
450 - Warn if the ContactInfo field is not set, and tell the relay
451 operator that not having a ContactInfo field set might cause their
452 relay to get rejected in the future. Fixes bug 33361; bugfix
455 o Minor bugfixes (bridges):
456 - Lowercase the configured value of BridgeDistribution before adding
457 it to the descriptor. Fixes bug 32753; bugfix on 0.3.2.3-alpha.
459 o Minor bugfixes (build system):
460 - Fix "make autostyle" for out-of-tree builds. Fixes bug 32370;
461 bugfix on 0.4.1.2-alpha.
463 o Minor bugfixes (compiler compatibility):
464 - Avoid compiler warnings from Clang 10 related to the use of GCC-
465 style "/* falls through */" comments. Both Clang and GCC allow
466 __attribute__((fallthrough)) instead, so that's what we're using
467 now. Fixes bug 34078; bugfix on 0.3.1.3-alpha.
468 - Fix compilation warnings with GCC 10.0.1. Fixes bug 34077; bugfix
471 o Minor bugfixes (configuration handling):
472 - Make control_event_conf_changed() take in a config_line_t instead
473 of a smartlist of alternating key/value entries. Fixes bug 31531;
474 bugfix on 0.2.3.3-alpha. Patch by Neel Chauhan.
475 - Check for multiplication overflow when parsing memory units inside
476 configuration. Fixes bug 30920; bugfix on 0.0.9rc1.
477 - When dumping the configuration, stop adding a trailing space after
478 the option name when there is no option value. This issue only
479 affects options that accept an empty value or list. (Most options
480 reject empty values, or delete the entire line from the dumped
481 options.) Fixes bug 32352; bugfix on 0.0.9pre6.
482 - Avoid changing the user's value of HardwareAccel as stored by
483 SAVECONF, when AccelName is set but HardwareAccel is not. Fixes
484 bug 32382; bugfix on 0.2.2.1-alpha.
485 - When creating a KeyDirectory with the same location as the
486 DataDirectory (not recommended), respect the DataDirectory's
487 group-readable setting if one has not been set for the
488 KeyDirectory. Fixes bug 27992; bugfix on 0.3.3.1-alpha.
490 o Minor bugfixes (continuous integration):
491 - Remove the buggy and unused mirroring job. Fixes bug 33213; bugfix
494 o Minor bugfixes (controller protocol):
495 - When receiving "ACTIVE" or "DORMANT" signals on the control port,
496 report them as SIGNAL events. Previously we would log a bug
497 warning. Fixes bug 33104; bugfix on 0.4.0.1-alpha.
499 o Minor bugfixes (controller):
500 - In routerstatus_has_changed(), check all the fields that are
501 output over the control port. Fixes bug 20218; bugfix
504 o Minor bugfixes (developer tools):
505 - Allow paths starting with ./ in scripts/add_c_file.py. Fixes bug
506 31336; bugfix on 0.4.1.2-alpha.
508 o Minor bugfixes (dirauth module):
509 - Split the dirauth config code into a separate file in the dirauth
510 module. Disable this code when the dirauth module is disabled.
512 - When the dirauth module is disabled, reject attempts to set the
513 AuthoritativeDir option, rather than ignoring the value of the
514 option. Fixes bug 32213; bugfix on 0.3.4.1-alpha.
516 o Minor bugfixes (embedded Tor):
517 - When starting Tor any time after the first time in a process,
518 register the thread in which it is running as the main thread.
519 Previously, we only did this on Windows, which could lead to bugs
520 like 23081 on non-Windows platforms. Fixes bug 32884; bugfix
523 o Minor bugfixes (git scripts):
524 - Avoid sleeping before the last push in git-push-all.sh. Closes
526 - Forward all unrecognised arguments in git-push-all.sh to git push.
529 o Minor bugfixes (key portability):
530 - When reading PEM-encoded key data, tolerate CRLF line-endings even
531 if we are not running on Windows. Previously, non-Windows hosts
532 would reject these line-endings in certain positions, making
533 certain key files hard to move from one host to another. Fixes bug
534 33032; bugfix on 0.3.5.1-alpha.
536 o Minor bugfixes (logging):
537 - Stop truncating IPv6 addresses and ports in channel and connection
538 logs. Fixes bug 33918; bugfix on 0.2.4.4-alpha.
539 - Flush stderr, stdout, and file logs during shutdown, if supported
540 by the OS. This change helps make sure that any final logs are
541 recorded. Fixes bug 33087; bugfix on 0.4.1.6.
542 - Stop closing stderr and stdout during shutdown. Closing these file
543 descriptors can hide sanitiser logs. Fixes bug 33087; bugfix
545 - If we encounter a bug when flushing a buffer to a TLS connection,
546 only log the bug once per invocation of the Tor process.
547 Previously we would log with every occurrence, which could cause
548 us to run out of disk space. Fixes bug 33093; bugfix
550 - When logging a bug, do not say "Future instances of this warning
551 will be silenced" unless we are actually going to silence them.
552 Previously we would say this whenever a BUG() check failed in the
553 code. Fixes bug 33095; bugfix on 0.4.1.1-alpha.
555 o Minor bugfixes (onion services v2):
556 - Move a series of v2 onion service warnings to protocol-warning
557 level because they can all be triggered remotely by a malformed
558 request. Fixes bug 32706; bugfix on 0.1.1.14-alpha.
559 - When sending the INTRO cell for a v2 Onion Service, look at the
560 failure cache alongside timeout values to check if the intro point
561 is marked as failed. Previously, we only looked at the relay
562 timeout values. Fixes bug 25568; bugfix on 0.2.7.3-rc. Patch by
565 o Minor bugfixes (onion services v3):
566 - Remove a BUG() warning that would cause a stack trace if an onion
567 service descriptor was freed while we were waiting for a
568 rendezvous circuit to complete. Fixes bug 28992; bugfix
570 - Relax severity of a log message that can appear naturally when
571 decoding onion service descriptors as a relay. Also add some
572 diagnostics to debug any future bugs in that area. Fixes bug
573 31669; bugfix on 0.3.0.1-alpha.
574 - Fix an assertion failure that could result from a corrupted
575 ADD_ONION control port command. Found by Saibato. Fixes bug 33137;
576 bugfix on 0.3.3.1-alpha. This issue is also tracked
578 - Properly handle the client rendezvous circuit timeout. Previously
579 Tor would sometimes timeout a rendezvous circuit awaiting the
580 introduction ACK, and find itself unable to re-establish all
581 circuits because the rendezvous circuit timed out too early. Fixes
582 bug 32021; bugfix on 0.3.2.1-alpha.
584 o Minor bugfixes (onion services):
585 - Do not rely on a "circuit established" flag for intro circuits but
586 instead always query the HS circuit map. This is to avoid sync
587 issue with that flag and the map. Fixes bug 32094; bugfix
590 o Minor bugfixes (onion services, all):
591 - In cancel_descriptor_fetches(), use
592 connection_list_by_type_purpose() instead of
593 connection_list_by_type_state(). Fixes bug 32639; bugfix on
594 0.3.2.1-alpha. Patch by Neel Chauhan.
596 o Minor bugfixes (pluggable transports):
597 - When receiving a message on standard error from a pluggable
598 transport, log it at info level, rather than as a warning. Fixes
599 bug 33005; bugfix on 0.4.0.1-alpha.
601 o Minor bugfixes (rust, build):
602 - Fix a syntax warning given by newer versions of Rust that was
603 creating problems for our continuous integration. Fixes bug 33212;
604 bugfix on 0.3.5.1-alpha.
606 o Minor bugfixes (scripts):
607 - Fix update_versions.py for out-of-tree builds. Fixes bug 32371;
608 bugfix on 0.4.0.1-alpha.
610 o Minor bugfixes (testing):
611 - Use the same code to find the tor binary in all of our test
612 scripts. This change makes sure we are always using the coverage
613 binary when coverage is enabled. Fixes bug 32368; bugfix
615 - Stop ignoring "tor --dump-config" errors in test_parseconf.sh.
616 Fixes bug 32468; bugfix on 0.4.2.1-alpha.
617 - Our option-validation tests no longer depend on specially
618 configured non-default, non-passing sets of options. Previously,
619 the tests had been written to assume that options would _not_ be
620 set to their defaults, which led to needless complexity and
621 verbosity. Fixes bug 32175; bugfix on 0.2.8.1-alpha.
623 o Minor bugfixes (TLS bug handling):
624 - When encountering a bug in buf_read_from_tls(), return a "MISC"
625 error code rather than "WANTWRITE". This change might help avoid
626 some CPU-wasting loops if the bug is ever triggered. Bug reported
627 by opara. Fixes bug 32673; bugfix on 0.3.0.4-alpha.
629 o Deprecated features:
630 - Deprecate the ClientAutoIPv6ORPort option. This option was not
631 true "Happy Eyeballs", and often failed on connections that
632 weren't reliably dual-stack. Closes ticket 32942. Patch by
636 - Provide a quickstart guide for a Circuit Padding Framework, and
637 documentation for researchers to implement and study circuit
638 padding machines. Closes ticket 28804.
639 - Add documentation in 'HelpfulTools.md' to describe how to build a
640 tag file. Closes ticket 32779.
641 - Create a high-level description of the long-term software
642 architecture goals. Closes ticket 32206.
643 - Describe the --dump-config command in the manual page. Closes
645 - Unite coding advice from this_not_that.md in torguts repo into our
646 coding standards document. Resolves ticket 31853.
649 - Our Doxygen configuration no longer generates LaTeX output. The
650 reference manual produced by doing this was over 4000 pages long,
651 and generally unusable. Closes ticket 32099.
652 - The option "TestingEstimatedDescriptorPropagationTime" is now
653 marked as obsolete. It has had no effect since 0.3.0.7, when
654 clients stopped rejecting consensuses "from the future". Closes
656 - We no longer support consensus methods before method 28; these
657 methods were only used by authorities running versions of Tor that
658 are now at end-of-life. In effect, this means that clients,
659 relays, and authorities now assume that authorities will be
660 running version 0.3.5.x or later. Closes ticket 32695.
663 - Avoid conflicts between the fake sockets in tor's unit tests, and
664 real file descriptors. Resolves issues running unit tests with
665 GitHub Actions, where the process that embeds or launches the
666 tests has already opened a large number of file descriptors. Fixes
667 bug 33782; bugfix on 0.2.8.1-alpha. Found and fixed by
669 - Add more test cases for tor's UTF-8 validation function. Also,
670 check the arguments passed to the function for consistency. Closes
672 - Improve test coverage for relay and dirauth config code, focusing
673 on option validation and normalization. Closes ticket 32213.
674 - Improve the consistency of test_parseconf.sh output, and run all
675 the tests, even if one fails. Closes ticket 32213.
676 - Run the practracker unit tests in the pre-commit git hook. Closes
679 o Code simplification and refactoring (channel):
680 - Channel layer had a variable length cell handler that was not used
681 and thus removed. Closes ticket 32892.
683 o Code simplification and refactoring (configuration):
684 - Immutability is now implemented as a flag on individual
685 configuration options rather than as part of the option-transition
686 checking code. Closes ticket 32344.
687 - Instead of keeping a list of configuration options to check for
688 relative paths, check all the options whose type is "FILENAME".
689 Solves part of ticket 32339.
690 - Our default log (which ordinarily sends NOTICE-level messages to
691 standard output) is now handled in a more logical manner.
692 Previously, we replaced the configured log options if they were
693 empty. Now, we interpret an empty set of log options as meaning
694 "use the default log". Closes ticket 31999.
695 - Remove some unused arguments from the options_validate() function,
696 to simplify our code and tests. Closes ticket 32187.
697 - Simplify the options_validate() code so that it looks at the
698 default options directly, rather than taking default options as an
699 argument. This change lets us simplify its interface. Closes
701 - Use our new configuration architecture to move most authority-
702 related options to the directory authority module. Closes
704 - When parsing the command line, handle options that determine our
705 "quiet level" and our mode of operation (e.g., --dump-config and
706 so on) all in one table. Closes ticket 32003.
708 o Code simplification and refactoring (controller):
709 - Create a new abstraction for formatting control protocol reply
710 lines based on key-value pairs. Refactor some existing control
711 protocol code to take advantage of this. Closes ticket 30984.
712 - Create a helper function that can fetch network status or
713 microdesc consensuses. Closes ticket 31684.
715 o Code simplification and refactoring (dirauth modularization):
716 - Remove the last remaining HAVE_MODULE_DIRAUTH inside a function.
718 - Replace some confusing identifiers in process_descs.c. Closes
720 - Simplify some relay and dirauth config code. Closes ticket 32213.
722 o Code simplification and refactoring (mainloop):
723 - Simplify the ip_address_changed() function by removing redundant
724 checks. Closes ticket 33091.
726 o Code simplification and refactoring (misc):
727 - Make all the structs we declare follow the same naming convention
728 of ending with "_t". Closes ticket 32415.
729 - Move and rename some configuration-related code for clarity.
731 - Our include.am files are now broken up by subdirectory.
732 Previously, src/core/include.am covered all of the subdirectories
733 in "core", "feature", and "app". Closes ticket 32137.
734 - Remove underused NS*() macros from test code: they make our tests
735 more confusing, especially for code-formatting tools. Closes
738 o Code simplification and refactoring (relay modularization):
739 - Disable relay_periodic when the relay module is disabled. Closes
741 - Disable relay_sys when the relay module is disabled. Closes
744 o Code simplification and refactoring (tool support):
745 - Add numerous missing dependencies to our include files, so that
746 they can be included in different reasonable orders and still
747 compile. Addresses part of ticket 32764.
748 - Fix some parts of our code that were difficult for Coccinelle to
749 parse. Related to ticket 31705.
750 - Fix some small issues in our code that prevented automatic
751 formatting tools from working. Addresses part of ticket 32764.
753 o Documentation (manpage):
754 - Alphabetize the Server and Directory server sections of the tor
755 manpage. Also split Statistics options into their own section of
756 the manpage. Closes ticket 33188. Work by Swati Thacker as part of
757 Google Season of Docs.
758 - Document the __OwningControllerProcess torrc option and specify
759 its polling interval. Resolves issue 32971.
760 - Split "Circuit Timeout" options and "Node Selection" options into
761 their own sections of the tor manpage. Closes tickets 32928 and
762 32929. Work by Swati Thacker as part of Google Season of Docs.
763 - Alphabetize the Client Options section of the tor manpage. Closes
765 - Alphabetize the General Options section of the tor manpage. Closes
767 - In the tor(1) manpage, reword and improve formatting of the
768 COMMAND-LINE OPTIONS and DESCRIPTION sections. Closes ticket
769 32277. Based on work by Swati Thacker as part of Google Season
771 - In the tor(1) manpage, reword and improve formatting of the FILES,
772 SEE ALSO, and BUGS sections. Closes ticket 32176. Based on work by
773 Swati Thacker as part of Google Season of Docs.
775 o Testing (Appveyor CI):
776 - In our Appveyor Windows CI, copy required DLLs to test and app
777 directories, before running tor's tests. This ensures that tor.exe
778 and test*.exe use the correct version of each DLL. This fix is not
779 required, but we hope it will avoid DLL search issues in future.
780 Fixes bug 33673; bugfix on 0.3.4.2-alpha.
781 - On Appveyor, skip the crypto/openssl_version test, which is
782 failing because of a mismatched library installation. Fix
785 o Testing (circuit, EWMA):
786 - Add unit tests for circuitmux and EWMA subsystems. Closes
789 o Testing (Travis CI):
790 - Remove a redundant distcheck job. Closes ticket 33194.
791 - Sort the Travis jobs in order of speed: putting the slowest jobs
792 first takes full advantage of Travis job concurrency. Closes
794 - Stop allowing the Chutney IPv6 Travis job to fail. This job was
795 previously configured to fast_finish (which requires
796 allow_failure), to speed up the build. Closes ticket 33195.
797 - When a Travis chutney job fails, use chutney's new "diagnostics.sh"
798 tool to produce detailed diagnostic output. Closes ticket 32792.
801 Changes in version 0.4.2.6 - 2020-01-30
802 This is the second stable release in the 0.4.2.x series. It backports
803 several bugfixes from 0.4.3.1-alpha, including some that had affected
804 the Linux seccomp2 sandbox or Windows services. If you're running with
805 one of those configurations, you'll probably want to upgrade;
806 otherwise, you should be fine with 0.4.2.5.
808 o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
809 - Correct how we use libseccomp. Particularly, stop assuming that
810 rules are applied in a particular order or that more rules are
811 processed after the first match. Neither is the case! In
812 libseccomp <2.4.0 this led to some rules having no effect.
813 libseccomp 2.4.0 changed how rules are generated, leading to a
814 different ordering, which in turn led to a fatal crash during
815 startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
817 - Fix crash when reloading logging configuration while the
818 experimental sandbox is enabled. Fixes bug 32841; bugfix on
819 0.4.1.7. Patch by Peter Gerber.
821 o Minor bugfixes (correctness checks, backport from 0.4.3.1-alpha):
822 - Use GCC/Clang's printf-checking feature to make sure that
823 tor_assertf() arguments are correctly typed. Fixes bug 32765;
824 bugfix on 0.4.1.1-alpha.
826 o Minor bugfixes (logging, crash, backport from 0.4.3.1-alpha):
827 - Avoid a possible crash when trying to log a (fatal) assertion
828 failure about mismatched magic numbers in configuration objects.
829 Fixes bug 32771; bugfix on 0.4.2.1-alpha.
831 o Minor bugfixes (testing, backport from 0.4.3.1-alpha):
832 - When TOR_DISABLE_PRACTRACKER is set, do not apply it to the
833 test_practracker.sh script. Doing so caused a test failure. Fixes
834 bug 32705; bugfix on 0.4.2.1-alpha.
835 - When TOR_DISABLE_PRACTRACKER is set, log a notice to stderr when
836 skipping practracker checks. Fixes bug 32705; bugfix
839 o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
840 - Initialize the publish/subscribe system when running as a windows
841 service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
843 o Testing (backport from 0.4.3.1-alpha):
844 - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
845 Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
846 fix the sandbox errors in 32722. Closes ticket 32240.
847 - Re-enable the Travis CI macOS Chutney build, but don't let it
848 prevent the Travis job from finishing. (The Travis macOS jobs are
849 slow, so we don't want to have it delay the whole CI process.)
852 o Testing (continuous integration, backport from 0.4.3.1-alpha):
853 - Use zstd in our Travis Linux builds. Closes ticket 32242.
856 Changes in version 0.4.1.8 - 2020-01-30
857 This release backports several bugfixes from later release series,
858 including some that had affected the Linux seccomp2 sandbox or Windows
859 services. If you're running with one of those configurations, you'll
860 probably want to upgrade; otherwise, you should be fine with your
861 current version of 0.4.1.x.
863 o Major bugfixes (linux seccomp sandbox, backport from 0.4.3.1-alpha):
864 - Correct how we use libseccomp. Particularly, stop assuming that
865 rules are applied in a particular order or that more rules are
866 processed after the first match. Neither is the case! In
867 libseccomp <2.4.0 this led to some rules having no effect.
868 libseccomp 2.4.0 changed how rules are generated, leading to a
869 different ordering, which in turn led to a fatal crash during
870 startup. Fixes bug 29819; bugfix on 0.2.5.1-alpha. Patch by
872 - Fix crash when reloading logging configuration while the
873 experimental sandbox is enabled. Fixes bug 32841; bugfix on
874 0.4.1.7. Patch by Peter Gerber.
876 o Minor bugfixes (crash, backport form 0.4.2.4-rc):
877 - When running Tor with an option like --verify-config or
878 --dump-config that does not start the event loop, avoid crashing
879 if we try to exit early because of an error. Fixes bug 32407;
880 bugfix on 0.3.3.1-alpha.
882 o Minor bugfixes (windows service, backport from 0.4.3.1-alpha):
883 - Initialize the publish/subscribe system when running as a windows
884 service. Fixes bug 32778; bugfix on 0.4.1.1-alpha.
886 o Testing (backport from 0.4.3.1-alpha):
887 - Turn off Tor's Sandbox in Chutney jobs, and run those jobs on
888 Ubuntu Bionic. Turning off the Sandbox is a work-around, until we
889 fix the sandbox errors in 32722. Closes ticket 32240.
890 - Re-enable the Travis CI macOS Chutney build, but don't let it
891 prevent the Travis job from finishing. (The Travis macOS jobs are
892 slow, so we don't want to have it delay the whole CI process.)
895 o Testing (continuous integration, backport from 0.4.3.1-alpha):
896 - Use zstd in our Travis Linux builds. Closes ticket 32242.
899 Changes in version 0.4.2.5 - 2019-12-09
900 This is the first stable release in the 0.4.2.x series. This series
901 improves reliability and stability, and includes several stability and
902 correctness improvements for onion services. It also fixes many smaller
903 bugs present in previous series.
905 Per our support policy, we will support the 0.4.2.x series for nine
906 months, or until three months after the release of a stable 0.4.3.x:
907 whichever is longer. If you need longer-term support, please stick
908 with 0.3.5.x, which will we plan to support until Feb 2022.
910 Below are the changes since 0.4.1.4-rc. For a complete list of only
911 the changes since 0.4.2.4-rc, see the ChangeLog file.
913 o Major features (directory authorities):
914 - Directory authorities now reject relays running all currently
915 deprecated release series. The currently supported release series
916 are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
918 o Major features (onion service v3, denial of service):
919 - Add onion service introduction denial of service defenses. Intro
920 points can now rate-limit client introduction requests, using
921 parameters that can be sent by the service within the
922 ESTABLISH_INTRO cell. If the cell extension for this is not used,
923 the intro point will honor the consensus parameters. Closes
926 o Major bugfixes (circuit build, guard):
927 - When considering upgrading circuits from "waiting for guard" to
928 "open", always ignore circuits that are marked for close.
929 Previously we could end up in the situation where a subsystem is
930 notified of a circuit opening, but the circuit is still marked for
931 close, leading to undesirable behavior. Fixes bug 30871; bugfix
934 o Major bugfixes (crash, Linux, Android):
935 - Tolerate systems (including some Android installations) where
936 madvise and MADV_DONTDUMP are available at build-time, but not at
937 run time. Previously, these systems would notice a failed syscall
938 and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
939 - Tolerate systems (including some Linux installations) where
940 madvise and/or MADV_DONTFORK are available at build-time, but not
941 at run time. Previously, these systems would notice a failed
942 syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
944 o Major bugfixes (embedded Tor):
945 - Avoid a possible crash when restarting Tor in embedded mode and
946 enabling a different set of publish/subscribe messages. Fixes bug
947 31898; bugfix on 0.4.1.1-alpha.
949 o Major bugfixes (relay):
950 - Relays now respect their AccountingMax bandwidth again. When
951 relays entered "soft" hibernation (which typically starts when
952 we've hit 90% of our AccountingMax), we had stopped checking
953 whether we should enter hard hibernation. Soft hibernation refuses
954 new connections and new circuits, but the existing circuits can
955 continue, meaning that relays could have exceeded their configured
956 AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
958 o Major bugfixes (torrc parsing):
959 - Stop ignoring torrc options after an %include directive, when the
960 included directory ends with a file that does not contain any
961 config options (but does contain comments or whitespace). Fixes
962 bug 31408; bugfix on 0.3.1.1-alpha.
964 o Major bugfixes (v3 onion services):
965 - Onion services now always use the exact number of intro points
966 configured with the HiddenServiceNumIntroductionPoints option (or
967 fewer if nodes are excluded). Before, a service could sometimes
968 pick more intro points than configured. Fixes bug 31548; bugfix
971 o Minor feature (onion services, control port):
972 - The ADD_ONION command's keyword "BEST" now defaults to ED25519-V3
973 (v3) onion services. Previously it defaulted to RSA1024 (v2).
976 o Minor features (auto-formatting scripts):
977 - When annotating C macros, never generate a line that our check-
978 spaces script would reject. Closes ticket 31759.
979 - When annotating C macros, try to remove cases of double-negation.
982 o Minor features (best practices tracker):
983 - Our best-practices tracker now integrates with our include-checker
984 tool to keep track of how many layering violations we have not yet
985 fixed. We hope to reduce this number over time to improve Tor's
986 modularity. Closes ticket 31176.
987 - Add a TOR_PRACTRACKER_OPTIONS variable for passing arguments to
988 practracker from the environment. We may want this for continuous
989 integration. Closes ticket 31309.
990 - Give a warning rather than an error when a practracker exception
991 is violated by a small amount, add a --list-overbroad option to
992 practracker that lists exceptions that are stricter than they need
993 to be, and provide an environment variable for disabling
994 practracker. Closes ticket 30752.
995 - Our best-practices tracker now looks at headers as well as C
996 files. Closes ticket 31175.
998 o Minor features (build system):
999 - Make pkg-config use --prefix when cross-compiling, if
1000 PKG_CONFIG_PATH is not set. Closes ticket 32191.
1001 - Add --disable-manpage and --disable-html-manual options to
1002 configure script. This will enable shortening build times by not
1003 building documentation. Resolves issue 19381.
1005 o Minor features (compilation):
1006 - Log a more useful error message when we are compiling and one of
1007 the compile-time hardening options we have selected can be linked
1008 but not executed. Closes ticket 27530.
1010 o Minor features (configuration):
1011 - The configuration code has been extended to allow splitting
1012 configuration data across multiple objects. Previously, all
1013 configuration data needed to be kept in a single object, which
1014 tended to become bloated. Closes ticket 31240.
1016 o Minor features (continuous integration):
1017 - When building on Appveyor and Travis, pass the "-k" flag to make,
1018 so that we are informed of all compilation failures, not just the
1019 first one or two. Closes ticket 31372.
1020 - When running CI builds on Travis, put some random data in
1021 ~/.torrc, to make sure no tests are reading the Tor configuration
1022 file from its default location. Resolves issue 30102.
1024 o Minor features (debugging):
1025 - Log a nonfatal assertion failure if we encounter a configuration
1026 line whose command is "CLEAR" but which has a nonempty value. This
1027 should be impossible, according to the rules of our configuration
1028 line parsing. Closes ticket 31529.
1030 o Minor features (geoip):
1031 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
1032 Country database. Closes ticket 32685.
1034 o Minor features (git hooks):
1035 - Our pre-commit git hook now checks for a special file before
1036 running practracker, so that practracker only runs on branches
1037 that are based on master. Since the pre-push hook calls the pre-
1038 commit hook, practracker will also only run before pushes of
1039 branches based on master. Closes ticket 30979.
1041 o Minor features (git scripts):
1042 - Add a "--" command-line argument, to separate git-push-all.sh
1043 script arguments from arguments that are passed through to git
1044 push. Closes ticket 31314.
1045 - Add a -r <remote-name> argument to git-push-all.sh, so the script
1046 can push test branches to a personal remote. Closes ticket 31314.
1047 - Add a -t <test-branch-prefix> argument to git-merge-forward.sh and
1048 git-push-all.sh, which makes these scripts create, merge forward,
1049 and push test branches. Closes ticket 31314.
1050 - Add a -u argument to git-merge-forward.sh, so that the script can
1051 re-use existing test branches after a merge failure and fix.
1052 Closes ticket 31314.
1053 - Add a TOR_GIT_PUSH env var, which sets the default git push
1054 command and arguments for git-push-all.sh. Closes ticket 31314.
1055 - Add a TOR_PUSH_DELAY variable to git-push-all.sh, which makes the
1056 script push master and maint branches with a delay between each
1057 branch. These delays trigger the CI jobs in a set order, which
1058 should show the most likely failures first. Also make pushes
1059 atomic by default, and make the script pass any command-line
1060 arguments to git push. Closes ticket 29879.
1061 - Call the shellcheck script from the pre-commit hook. Closes
1063 - Skip pushing test branches that are the same as a remote
1064 maint/release/master branch in git-push-all.sh by default. Add a
1065 -s argument, so git-push-all.sh can push all test branches. Closes
1068 o Minor features (IPv6, logging):
1069 - Log IPv6 addresses as well as IPv4 addresses when describing
1070 routerinfos, routerstatuses, and nodes. Closes ticket 21003.
1072 o Minor features (maintenance scripts):
1073 - Add a Coccinelle script to detect bugs caused by incrementing or
1074 decrementing a variable inside a call to log_debug(). Since
1075 log_debug() is a macro whose arguments are conditionally
1076 evaluated, it is usually an error to do this. One such bug was
1077 30628, in which SENDME cells were miscounted by a decrement
1078 operator inside a log_debug() call. Closes ticket 30743.
1080 o Minor features (onion service v3):
1081 - Do not allow single hop clients to fetch or post an HS descriptor
1082 from an HSDir. Closes ticket 24964.
1084 o Minor features (onion service):
1085 - Disallow single-hop clients at the introduction point. We've
1086 removed Tor2web support a while back and single-hop rendezvous
1087 attempts are blocked at the relays. This change should remove load
1088 off the network from spammy clients. Close ticket 24963.
1090 o Minor features (onion services v3):
1091 - Assist users who try to setup v2 client authorization in v3 onion
1092 services by pointing them to the right documentation. Closes
1095 o Minor features (stem tests):
1096 - Change "make test-stem" so it only runs the stem tests that use
1097 tor. This change makes test-stem faster and more reliable. Closes
1100 o Minor features (testing):
1101 - When running tests that attempt to look up hostnames, replace the
1102 libc name lookup functions with ones that do not actually touch
1103 the network. This way, the tests complete more quickly in the
1104 presence of a slow or missing DNS resolver. Closes ticket 31841.
1105 - Add a script to invoke "tor --dump-config" and "tor
1106 --verify-config" with various configuration options, and see
1107 whether tor's resulting configuration or error messages are what
1108 we expect. Use it for integration testing of our +Option and
1109 /Option flags. Closes ticket 31637.
1110 - Improve test coverage for our existing configuration parsing and
1111 management API. Closes ticket 30893.
1112 - Add integration tests to make sure that practracker gives the
1113 outputs we expect. Closes ticket 31477.
1114 - The practracker self-tests are now run as part of the Tor test
1115 suite. Closes ticket 31304.
1117 o Minor features (testing, continuous integration):
1118 - Disable all but one Travis CI macOS build, to mitigate slow
1119 scheduling of Travis macOS jobs. Closes ticket 32177.
1120 - Run the chutney IPv6 networks as part of Travis CI. Closes
1122 - Simplify the Travis CI build matrix, and optimise for build time.
1123 Closes ticket 31859.
1124 - Use Windows Server 2019 instead of Windows Server 2016 in our
1125 Appveyor builds. Closes ticket 32086.
1127 o Minor features (token bucket):
1128 - Implement a generic token bucket that uses a single counter, for
1129 use in anti-DoS onion service work. Closes ticket 30687.
1131 o Minor bugfixes (Appveyor continuous integration):
1132 - Avoid spurious errors when Appveyor CI fails before the install
1133 step. Fixes bug 31884; bugfix on 0.3.4.2-alpha.
1135 o Minor bugfixes (best practices tracker):
1136 - Fix a few issues in the best-practices script, including tests,
1137 tab tolerance, error reporting, and directory-exclusion logic.
1138 Fixes bug 29746; bugfix on 0.4.1.1-alpha.
1139 - When running check-best-practices, only consider files in the src
1140 subdirectory. Previously we had recursively considered all
1141 subdirectories, which made us get confused by the temporary
1142 directories made by "make distcheck". Fixes bug 31578; bugfix
1145 o Minor bugfixes (build system):
1146 - Interpret "--disable-module-dirauth=no" correctly. Fixes bug
1147 32124; bugfix on 0.3.4.1-alpha.
1148 - Interpret "--with-tcmalloc=no" correctly. Fixes bug 32124; bugfix
1150 - Stop failing when jemalloc is requested, but tcmalloc is not
1151 found. Fixes bug 32124; bugfix on 0.3.5.1-alpha.
1152 - When pkg-config is not installed, or a library that depends on
1153 pkg-config is not found, tell the user what to do to fix the
1154 problem. Fixes bug 31922; bugfix on 0.3.1.1-alpha.
1155 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
1156 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
1158 o Minor bugfixes (chutney, makefiles, documentation):
1159 - "make test-network-all" now shows the warnings from each test-
1160 network.sh run on the console, so developers see new warnings
1161 early. We've also improved the documentation for this feature, and
1162 renamed a Makefile variable so the code is self-documenting. Fixes
1163 bug 30455; bugfix on 0.3.0.4-rc.
1165 o Minor bugfixes (client, onion service v3):
1166 - Fix a BUG() assertion that occurs within a very small race window
1167 between when a client intro circuit opens and when its descriptor
1168 gets cleaned up from the cache. The circuit is now closed early,
1169 which will trigger a re-fetch of the descriptor and continue the
1170 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
1172 o Minor bugfixes (code quality):
1173 - Fix "make check-includes" so it runs correctly on out-of-tree
1174 builds. Fixes bug 31335; bugfix on 0.3.5.1-alpha.
1176 o Minor bugfixes (compilation):
1177 - Add more stub functions to fix compilation on Android with link-
1178 time optimization when --disable-module-dirauth is used.
1179 Previously, these compilation settings would make the compiler
1180 look for functions that didn't exist. Fixes bug 31552; bugfix
1182 - Suppress spurious float-conversion warnings from GCC when calling
1183 floating-point classifier functions on FreeBSD. Fixes part of bug
1184 31687; bugfix on 0.3.1.5-alpha.
1186 o Minor bugfixes (configuration):
1187 - Invalid floating-point values in the configuration file are now
1188 treated as errors in the configuration. Previously, they were
1189 ignored and treated as zero. Fixes bug 31475; bugfix on 0.0.1.
1191 o Minor bugfixes (connections):
1192 - Avoid trying to read data from closed connections, which can cause
1193 needless loops in Libevent and infinite loops in Shadow. Fixes bug
1194 30344; bugfix on 0.1.1.1-alpha.
1196 o Minor bugfixes (controller protocol):
1197 - Fix the MAPADDRESS controller command to accept one or more
1198 arguments. Previously, it required two or more arguments, and
1199 ignored the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
1201 o Minor bugfixes (coverity):
1202 - Add an assertion when parsing a BEGIN cell so that coverity can be
1203 sure that we are not about to dereference a NULL address. Fixes
1204 bug 31026; bugfix on 0.2.4.7-alpha. This is CID 1447296.
1205 - In our siphash implementation, when building for coverity, use
1206 memcpy in place of a switch statement, so that coverity can tell
1207 we are not accessing out-of-bounds memory. Fixes bug 31025; bugfix
1208 on 0.2.8.1-alpha. This is tracked as CID 1447293 and 1447295.
1209 - Fix several coverity warnings from our unit tests. Fixes bug
1210 31030; bugfix on 0.2.4.1-alpha, 0.3.2.1-alpha, and 0.4.0.1-alpha.
1212 o Minor bugfixes (crash):
1213 - When running Tor with an option like --verify-config or
1214 --dump-config that does not start the event loop, avoid crashing
1215 if we try to exit early because of an error. Fixes bug 32407;
1216 bugfix on 0.3.3.1-alpha.
1218 o Minor bugfixes (developer tooling):
1219 - Only log git script changes in the post-merge script when the
1220 merge was to the master branch. Fixes bug 31040; bugfix
1223 o Minor bugfixes (directory authorities):
1224 - Return a distinct status when formatting annotations fails. Fixes
1225 bug 30780; bugfix on 0.2.0.8-alpha.
1227 o Minor bugfixes (error handling):
1228 - Always lock the backtrace buffer before it is used. Fixes bug
1229 31734; bugfix on 0.2.5.3-alpha.
1230 - On abort, try harder to flush the output buffers of log messages.
1231 On some platforms (macOS), log messages could be discarded when
1232 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
1233 - Report the tor version whenever an assertion fails. Previously, we
1234 only reported the Tor version on some crashes, and some non-fatal
1235 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
1236 - When tor aborts due to an error, close log file descriptors before
1237 aborting. Closing the logs makes some OSes flush log file buffers,
1238 rather than deleting buffered log lines. Fixes bug 31594; bugfix
1241 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6):
1242 - When extracting an IPv6 address from a PF-based proxy, verify that
1243 we are actually configured to receive an IPv6 address, and log an
1244 internal error if not. Fixes part of bug 31687; bugfix
1247 o Minor bugfixes (git hooks):
1248 - Remove a duplicate call to practracker from the pre-push hook. The
1249 pre-push hook already calls the pre-commit hook, which calls
1250 practracker. Fixes bug 31462; bugfix on 0.4.1.1-alpha.
1252 o Minor bugfixes (git scripts):
1253 - Stop hard-coding the bash path in the git scripts. Some OSes don't
1254 have bash in /usr/bin, others have an ancient bash at this path.
1255 Fixes bug 30840; bugfix on 0.4.0.1-alpha.
1256 - Stop hard-coding the tor master branch name and worktree path in
1257 the git scripts. Fixes bug 30841; bugfix on 0.4.0.1-alpha.
1258 - Allow git-push-all.sh to be run from any directory. Previously,
1259 the script only worked if run from an upstream worktree directory.
1260 Closes ticket 31678.
1262 o Minor bugfixes (guards):
1263 - When tor is missing descriptors for some primary entry guards,
1264 make the log message less alarming. It's normal for descriptors to
1265 expire, as long as tor fetches new ones soon after. Fixes bug
1266 31657; bugfix on 0.3.3.1-alpha.
1268 o Minor bugfixes (ipv6):
1269 - Check for private IPv6 addresses alongside their IPv4 equivalents
1270 when authorities check descriptors. Previously, we only checked
1271 for private IPv4 addresses. Fixes bug 31088; bugfix on
1272 0.2.3.21-rc. Patch by Neel Chauhan.
1273 - When parsing microdescriptors, we should check the IPv6 exit
1274 policy alongside IPv4. Previously, we checked both exit policies
1275 for only router info structures, while microdescriptors were
1276 IPv4-only. Fixes bug 27284; bugfix on 0.2.3.1-alpha. Patch by
1279 o Minor bugfixes (logging):
1280 - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
1281 uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
1282 - Disable backtrace signal handlers when shutting down tor. Fixes
1283 bug 31614; bugfix on 0.2.5.2-alpha.
1284 - Rate-limit our the logging message about the obsolete .exit
1285 notation. Previously, there was no limit on this warning, which
1286 could potentially be triggered many times by a hostile website.
1287 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
1288 - When initialising log domain masks, only set known log domains.
1289 Fixes bug 31854; bugfix on 0.2.1.1-alpha.
1290 - Change log level of message "Hash of session info was not as
1291 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
1293 - Fix a code issue that would have broken our parsing of log domains
1294 as soon as we had 33 of them. Fortunately, we still only have 29.
1295 Fixes bug 31451; bugfix on 0.4.1.4-rc.
1297 o Minor bugfixes (logging, protocol violations):
1298 - Do not log a nonfatal assertion failure when receiving a VERSIONS
1299 cell on a connection using the obsolete v1 link protocol. Log a
1300 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
1302 o Minor bugfixes (mainloop, periodic events, in-process API):
1303 - Reset the periodic events' "enabled" flag when Tor is shut down
1304 cleanly. Previously, this flag was left on, which caused periodic
1305 events not to be re-enabled when Tor was relaunched in-process
1306 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
1309 o Minor bugfixes (memory management):
1310 - Stop leaking a small amount of memory in nt_service_install(), in
1311 unreachable code. Fixes bug 30799; bugfix on 0.2.0.7-alpha. Patch
1314 o Minor bugfixes (modules):
1315 - Explain what the optional Directory Authority module is, and what
1316 happens when it is disabled. Fixes bug 31825; bugfix
1319 o Minor bugfixes (multithreading):
1320 - Avoid some undefined behaviour when freeing mutexes. Fixes bug
1321 31736; bugfix on 0.0.7.
1323 o Minor bugfixes (networking, IP addresses):
1324 - When parsing addresses via Tor's internal DNS lookup API, reject
1325 IPv4 addresses in square brackets, and accept IPv6 addresses in
1326 square brackets. This change completes the work started in 23082,
1327 making address parsing consistent between tor's internal DNS
1328 lookup and address parsing APIs. Fixes bug 30721; bugfix
1330 - When parsing addresses via Tor's internal address:port parsing and
1331 DNS lookup APIs, require IPv6 addresses with ports to have square
1332 brackets. But allow IPv6 addresses without ports, whether or not
1333 they have square brackets. Fixes bug 30721; bugfix
1336 o Minor bugfixes (onion service v3):
1337 - When purging the client descriptor cache, close any introduction
1338 point circuits associated with purged cache entries. This avoids
1339 picking those circuits later when connecting to the same
1340 introduction points. Fixes bug 30921; bugfix on 0.3.2.1-alpha.
1342 o Minor bugfixes (onion services):
1343 - In the hs_ident_circuit_t data structure, remove the unused field
1344 circuit_type and the respective argument in hs_ident_circuit_new().
1345 This field was set by clients (for introduction) and services (for
1346 introduction and rendezvous) but was never used afterwards. Fixes
1347 bug 31490; bugfix on 0.3.2.1-alpha. Patch by Neel Chauhan.
1349 o Minor bugfixes (operator tools):
1350 - Make tor-print-ed-signing-cert(1) print certificate expiration
1351 date in RFC 1123 and UNIX timestamp formats, to make output
1352 machine readable. Fixes bug 31012; bugfix on 0.3.5.1-alpha.
1354 o Minor bugfixes (process management):
1355 - Remove overly strict assertions that triggered when a pluggable
1356 transport failed to launch. Fixes bug 31091; bugfix
1358 - Remove an assertion in the Unix process backend. This assertion
1359 would trigger when we failed to find the executable for a child
1360 process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
1362 o Minor bugfixes (relay):
1363 - Avoid crashing when starting with a corrupt keys directory where
1364 the old ntor key and the new ntor key are identical. Fixes bug
1365 30916; bugfix on 0.2.4.8-alpha.
1367 o Minor bugfixes (rust):
1368 - Correctly exclude a redundant rust build job in Travis. Fixes bug
1369 31463; bugfix on 0.3.5.4-alpha.
1370 - Raise the minimum rustc version to 1.31.0, as checked by configure
1371 and CI. Fixes bug 31442; bugfix on 0.3.5.4-alpha.
1373 o Minor bugfixes (sendme, code structure):
1374 - Rename the trunnel SENDME file definition from sendme.trunnel to
1375 sendme_cell.trunnel to avoid having twice sendme.{c|h} in the
1376 repository. Fixes bug 30769; bugfix on 0.4.1.1-alpha.
1378 o Minor bugfixes (statistics):
1379 - Stop removing the ed25519 signature if the extra info file is too
1380 big. If the signature data was removed, but the keyword was kept,
1381 this could result in an unparseable extra info file. Fixes bug
1382 30958; bugfix on 0.2.7.2-alpha.
1384 o Minor bugfixes (subsystems):
1385 - Make the subsystem init order match the subsystem module
1386 dependencies. Call windows process security APIs as early as
1387 possible. Initialize logging before network and time, so that
1388 network and time can use logging. Fixes bug 31615; bugfix
1391 o Minor bugfixes (testing):
1392 - Avoid intermittent test failures due to a test that had relied on
1393 inconsistent timing sources. Fixes bug 31995; bugfix
1395 - When testing port rebinding, don't busy-wait for tor to log.
1396 Instead, actually sleep for a short time before polling again.
1397 Also improve the formatting of control commands and log messages.
1398 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
1399 - Teach the util/socketpair_ersatz test to work correctly when we
1400 have no network stack configured. Fixes bug 30804; bugfix
1403 o Minor bugfixes (tests, SunOS):
1404 - Avoid a map_anon_nofork test failure due to a signed/unsigned
1405 integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
1407 o Minor bugfixes (tls, logging):
1408 - Log bugs about the TLS read buffer's length only once, rather than
1409 filling the logs with similar warnings. Fixes bug 31939; bugfix
1412 o Minor bugfixes (v2 single onion services):
1413 - Always retry v2 single onion service intro and rend circuits with
1414 a 3-hop path. Previously, v2 single onion services used a 3-hop
1415 path when rendezvous circuits were retried after a remote or
1416 delayed failure, but a 1-hop path for immediate retries. Fixes bug
1417 23818; bugfix on 0.2.9.3-alpha.
1419 o Minor bugfixes (v3 onion services):
1420 - When cleaning up intro circuits for a v3 onion service, don't
1421 remove circuits that have an established or pending circuit, even
1422 if they ran out of retries. This way, we don't remove a circuit on
1423 its last retry. Fixes bug 31652; bugfix on 0.3.2.1-alpha.
1425 o Minor bugfixes (v3 single onion services):
1426 - Always retry v3 single onion service intro and rend circuits with
1427 a 3-hop path. Previously, v3 single onion services used a 3-hop
1428 path when rend circuits were retried after a remote or delayed
1429 failure, but a 1-hop path for immediate retries. Fixes bug 23818;
1430 bugfix on 0.3.2.1-alpha.
1431 - Make v3 single onion services fall back to a 3-hop intro, when all
1432 intro points are unreachable via a 1-hop path. Previously, v3
1433 single onion services failed when all intro nodes were unreachable
1434 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
1436 o Code simplification and refactoring:
1437 - Refactor connection_control_process_inbuf() to reduce the size of
1438 a practracker exception. Closes ticket 31840.
1439 - Refactor the microdescs_parse_from_string() function into smaller
1440 pieces, for better comprehensibility. Closes ticket 31675.
1441 - Use SEVERITY_MASK_IDX() to find the LOG_* mask indexes in the unit
1442 tests and fuzzers, rather than using hard-coded values. Closes
1444 - Interface for function `decrypt_desc_layer` cleaned up. Closes
1448 - Correct the description of "GuardLifetime". Fixes bug 31189;
1449 bugfix on 0.3.0.1-alpha.
1450 - Make clear in the man page, in both the bandwidth section and the
1451 AccountingMax section, that Tor counts in powers of two, not
1452 powers of ten: 1 GByte is 1024*1024*1024 bytes, not one billion
1453 bytes. Resolves ticket 32106.
1454 - Document the signal-safe logging behaviour in the tor man page.
1455 Also add some comments to the relevant functions. Closes
1457 - Explain why we can't destroy the backtrace buffer mutex. Explain
1458 why we don't need to destroy the log mutex. Closes ticket 31736.
1459 - The Tor source code repository now includes a (somewhat dated)
1460 description of Tor's modular architecture, in doc/HACKING/design.
1461 This is based on the old "tor-guts.git" repository, which we are
1462 adopting and superseding. Closes ticket 31849.
1463 - Improve documentation in circuit padding subsystem. Patch by
1464 Tobias Pulls. Closes ticket 31113.
1465 - Include an example usage for IPv6 ORPort in our sample torrc.
1466 Closes ticket 31320; patch from Ali Raheem.
1467 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
1468 notice.html so that operators no longer have to host it
1469 themselves. Closes ticket 31089.
1472 - No longer include recommended package digests in votes as detailed
1473 in proposal 301. The RecommendedPackages torrc option is
1474 deprecated and will no longer have any effect. "package" lines
1475 will still be considered when computing consensuses for consensus
1476 methods that include them. (This change has no effect on the list
1477 of recommended Tor versions, which is still in use.) Closes
1479 - Remove torctl.in from contrib/dist directory. Resolves
1483 - Require C99 standards-conforming code in Travis CI, but allow GNU
1484 gcc extensions. Also activates clang's -Wtypedef-redefinition
1485 warnings. Build some jobs with -std=gnu99, and some jobs without.
1486 Closes ticket 32500.
1487 - Run shellcheck for all non-third-party shell scripts that are
1488 shipped with Tor. Closes ticket 29533.
1489 - When checking shell scripts, ignore any user-created directories.
1490 Closes ticket 30967.
1492 o Code simplification and refactoring (config handling):
1493 - Extract our variable manipulation code from confparse.c to a new
1494 lower-level typedvar.h module. Closes ticket 30864.
1495 - Lower another layer of object management from confparse.c to a
1496 more general tool. Now typed structure members are accessible via
1497 an abstract type. Implements ticket 30914.
1498 - Move our backend logic for working with configuration and state
1499 files into a lower-level library, since it no longer depends on
1500 any tor-specific functionality. Closes ticket 31626.
1501 - Numerous simplifications in configuration-handling logic: remove
1502 duplicated macro definitions, replace magical names with flags,
1503 and refactor "TestingTorNetwork" to use the same default-option
1504 logic as the rest of Tor. Closes ticket 30935.
1505 - Replace our ad-hoc set of flags for configuration variables and
1506 configuration variable types with fine-grained orthogonal flags
1507 corresponding to the actual behavior we want. Closes ticket 31625.
1509 o Code simplification and refactoring (misc):
1510 - Eliminate some uses of lower-level control reply abstractions,
1511 primarily in the onion_helper functions. Closes ticket 30889.
1512 - Rework bootstrap tracking to use the new publish-subscribe
1513 subsystem. Closes ticket 29976.
1514 - Rewrite format_node_description() and router_get_verbose_nickname()
1515 to use strlcpy() and strlcat(). The previous implementation used
1516 memcpy() and pointer arithmetic, which was error-prone. Closes
1517 ticket 31545. This is CID 1452819.
1518 - Split extrainfo_dump_to_string() into smaller functions. Closes
1520 - Use the ptrdiff_t type consistently for expressing variable
1521 offsets and pointer differences. Previously we incorrectly (but
1522 harmlessly) used int and sometimes off_t for these cases. Closes
1524 - Use the subsystems mechanism to manage the main event loop code.
1525 Closes ticket 30806.
1526 - Various simplifications and minor improvements to the circuit
1527 padding machines. Patch by Tobias Pulls. Closes tickets 31112
1530 o Documentation (hard-coded directories):
1531 - Improve the documentation for the DirAuthority and FallbackDir
1532 torrc options. Closes ticket 30955.
1534 o Documentation (tor.1 man page):
1535 - Fix typo in tor.1 man page: the option is "--help", not "-help".
1536 Fixes bug 31008; bugfix on 0.2.2.9-alpha.
1538 o Testing (continuous integration):
1539 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
1540 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
1541 until we can fix some Bionic permissions issues (see ticket
1542 32240). Related to ticket 31919.
1543 - Install the mingw OpenSSL package in Appveyor. This makes sure
1544 that the OpenSSL headers and libraries match in Tor's Appveyor
1545 builds. (This bug was triggered by an Appveyor image update.)
1546 Fixes bug 32449; bugfix on 0.3.5.6-rc.
1547 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
1550 Changes in version 0.4.1.7 - 2019-12-09
1551 This release backports several bugfixes to improve stability and
1552 correctness. Anyone experiencing build problems or crashes with 0.4.1.6,
1553 including all relays relying on AccountingMax, should upgrade.
1555 o Major features (directory authorities, backport from 0.4.2.2-alpha):
1556 - Directory authorities now reject relays running all currently
1557 deprecated release series. The currently supported release series
1558 are: 0.2.9, 0.3.5, 0.4.0, 0.4.1, and 0.4.2. Closes ticket 31549.
1560 o Major bugfixes (embedded Tor, backport from 0.4.2.2-alpha):
1561 - Avoid a possible crash when restarting Tor in embedded mode and
1562 enabling a different set of publish/subscribe messages. Fixes bug
1563 31898; bugfix on 0.4.1.1-alpha.
1565 o Major bugfixes (relay, backport from 0.4.2.3-alpha):
1566 - Relays now respect their AccountingMax bandwidth again. When
1567 relays entered "soft" hibernation (which typically starts when
1568 we've hit 90% of our AccountingMax), we had stopped checking
1569 whether we should enter hard hibernation. Soft hibernation refuses
1570 new connections and new circuits, but the existing circuits can
1571 continue, meaning that relays could have exceeded their configured
1572 AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
1574 o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
1575 - Stop ignoring torrc options after an %include directive, when the
1576 included directory ends with a file that does not contain any
1577 config options (but does contain comments or whitespace). Fixes
1578 bug 31408; bugfix on 0.3.1.1-alpha.
1580 o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
1581 - Onion services now always use the exact number of intro points
1582 configured with the HiddenServiceNumIntroductionPoints option (or
1583 fewer if nodes are excluded). Before, a service could sometimes
1584 pick more intro points than configured. Fixes bug 31548; bugfix
1587 o Minor features (continuous integration, backport from 0.4.2.2-alpha):
1588 - When building on Appveyor and Travis, pass the "-k" flag to make,
1589 so that we are informed of all compilation failures, not just the
1590 first one or two. Closes ticket 31372.
1592 o Minor features (geoip, backport from 0.4.2.5):
1593 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
1594 Country database. Closes ticket 32685.
1596 o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
1597 - Avoid spurious errors when Appveyor CI fails before the install step.
1598 Fixes bug 31884; bugfix on 0.3.4.2-alpha.
1600 o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
1601 - Fix a BUG() assertion that occurs within a very small race window
1602 between when a client intro circuit opens and when its descriptor
1603 gets cleaned up from the cache. The circuit is now closed early,
1604 which will trigger a re-fetch of the descriptor and continue the
1605 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
1607 o Minor bugfixes (connections, backport from 0.4.2.3-rc):
1608 - Avoid trying to read data from closed connections, which can cause
1609 needless loops in Libevent and infinite loops in Shadow. Fixes bug
1610 30344; bugfix on 0.1.1.1-alpha.
1612 o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
1613 - On abort, try harder to flush the output buffers of log messages.
1614 On some platforms (macOS), log messages could be discarded when
1615 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
1616 - Report the tor version whenever an assertion fails. Previously, we
1617 only reported the Tor version on some crashes, and some non-fatal
1618 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
1619 - When tor aborts due to an error, close log file descriptors before
1620 aborting. Closing the logs makes some OSes flush log file buffers,
1621 rather than deleting buffered log lines. Fixes bug 31594; bugfix
1624 o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
1625 - Add a missing check for HAVE_PTHREAD_H, because the backtrace code
1626 uses mutexes. Fixes bug 31614; bugfix on 0.2.5.2-alpha.
1627 - Disable backtrace signal handlers when shutting down tor. Fixes
1628 bug 31614; bugfix on 0.2.5.2-alpha.
1629 - Rate-limit our the logging message about the obsolete .exit
1630 notation. Previously, there was no limit on this warning, which
1631 could potentially be triggered many times by a hostile website.
1632 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
1634 o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
1635 - Do not log a nonfatal assertion failure when receiving a VERSIONS
1636 cell on a connection using the obsolete v1 link protocol. Log a
1637 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
1639 o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
1640 - Reset the periodic events' "enabled" flag when Tor is shut down
1641 cleanly. Previously, this flag was left on, which caused periodic
1642 events not to be re-enabled when Tor was relaunched in-process
1643 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
1646 o Minor bugfixes (multithreading, backport from 0.4.2.2-alpha):
1647 - Avoid some undefined behaviour when freeing mutexes. Fixes bug
1648 31736; bugfix on 0.0.7.
1650 o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
1651 - Remove overly strict assertions that triggered when a pluggable
1652 transport failed to launch. Fixes bug 31091; bugfix
1654 - Remove an assertion in the Unix process backend. This assertion
1655 would trigger when we failed to find the executable for a child
1656 process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
1658 o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
1659 - Avoid crashing when starting with a corrupt keys directory where
1660 the old ntor key and the new ntor key are identical. Fixes bug
1661 30916; bugfix on 0.2.4.8-alpha.
1663 o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
1664 - When testing port rebinding, don't busy-wait for tor to log.
1665 Instead, actually sleep for a short time before polling again.
1666 Also improve the formatting of control commands and log messages.
1667 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
1669 o Minor bugfixes (tests, SunOS, backport from 0.4.2.2-alpha):
1670 - Avoid a map_anon_nofork test failure due to a signed/unsigned
1671 integer comparison. Fixes bug 31897; bugfix on 0.4.1.1-alpha.
1673 o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
1674 - Log bugs about the TLS read buffer's length only once, rather than
1675 filling the logs with similar warnings. Fixes bug 31939; bugfix
1678 o Documentation (backport from 0.4.2.2-alpha):
1679 - Explain why we can't destroy the backtrace buffer mutex. Explain
1680 why we don't need to destroy the log mutex. Closes ticket 31736.
1682 o Testing (continuous integration, backport from 0.4.2.3-alpha):
1683 - Disable all but one Travis CI macOS build, to mitigate slow
1684 scheduling of Travis macOS jobs. Closes ticket 32177.
1685 - Run the chutney IPv6 networks as part of Travis CI. Closes
1687 - Simplify the Travis CI build matrix, and optimise for build time.
1688 Closes ticket 31859.
1689 - Use Windows Server 2019 instead of Windows Server 2016 in our
1690 Appveyor builds. Closes ticket 32086.
1692 o Testing (continuous integration, backport from 0.4.2.4-rc):
1693 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
1694 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
1695 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
1696 until we can fix some Bionic permissions issues (see ticket
1697 32240). Related to ticket 31919.
1698 - Install the mingw OpenSSL package in Appveyor. This makes sure
1699 that the OpenSSL headers and libraries match in Tor's Appveyor
1700 builds. (This bug was triggered by an Appveyor image update.)
1701 Fixes bug 32449; bugfix on 0.3.5.6-rc.
1703 o Testing (continuous integration, backport from 0.4.2.5):
1704 - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
1705 extensions. Also activates clang's -Wtypedef-redefinition warnings.
1706 Build some jobs with -std=gnu99, and some jobs without.
1707 Closes ticket 32500.
1710 Changes in version 0.4.0.6 - 2019-12-09
1711 This is the second stable release in the 0.4.0.x series. This release
1712 backports several bugfixes to improve stability and correctness. Anyone
1713 experiencing build problems or crashes with 0.4.0.5, including all relays
1714 relying on AccountingMax, should upgrade.
1716 Note that, per our support policy, support for the 0.4.0.x series will end
1717 on 2 Feb 2020. Anyone still running 0.4.0.x should plan to upgrade to the
1718 latest stable release, or downgrade to 0.3.5.x, which will get long-term
1719 support until 1 Feb 2022.
1721 o Directory authority changes (backport from 0.4.1.5):
1722 - The directory authority "dizum" has a new IP address. Closes
1725 o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
1726 - Consider our directory information to have changed when our list
1727 of bridges changes. Previously, Tor would not re-compute the
1728 status of its directory information when bridges changed, and
1729 therefore would not realize that it was no longer able to build
1730 circuits. Fixes part of bug 29875.
1731 - Do not count previously configured working bridges towards our
1732 total of working bridges. Previously, when Tor's list of bridges
1733 changed, it would think that the old bridges were still usable,
1734 and delay fetching router descriptors for the new ones. Fixes part
1735 of bug 29875; bugfix on 0.3.0.1-alpha.
1737 o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
1738 - When considering upgrading circuits from "waiting for guard" to
1739 "open", always ignore circuits that are marked for close. Otherwise,
1740 we can end up in the situation where a subsystem is notified that
1741 a closing circuit has just opened, leading to undesirable
1742 behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
1744 o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
1745 - Properly clean up the introduction point map when circuits change
1746 purpose from onion service circuits to pathbias, measurement, or
1747 other circuit types. This should fix some service-side instances
1748 of introduction point failure. Fixes bug 29034; bugfix
1751 o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
1752 - Fix an unreachable bug in which an introduction point could try to
1753 send an INTRODUCE_ACK with a status code that Trunnel would refuse
1754 to encode, leading the relay to assert(). We've consolidated the
1755 ABI values into Trunnel now. Fixes bug 30454; bugfix
1757 - Clients can now handle unknown status codes from INTRODUCE_ACK
1758 cells. (The NACK behavior will stay the same.) This will allow us
1759 to extend status codes in the future without breaking the normal
1760 client behavior. Fixes another part of bug 30454; bugfix
1763 o Major bugfixes (relay, backport from 0.4.2.3-alpha):
1764 - Relays now respect their AccountingMax bandwidth again. When
1765 relays entered "soft" hibernation (which typically starts when
1766 we've hit 90% of our AccountingMax), we had stopped checking
1767 whether we should enter hard hibernation. Soft hibernation refuses
1768 new connections and new circuits, but the existing circuits can
1769 continue, meaning that relays could have exceeded their configured
1770 AccountingMax. Fixes bug 32108; bugfix on 0.4.0.1-alpha.
1772 o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
1773 - Stop ignoring torrc options after an %include directive, when the
1774 included directory ends with a file that does not contain any
1775 config options (but does contain comments or whitespace). Fixes
1776 bug 31408; bugfix on 0.3.1.1-alpha.
1778 o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
1779 - Onion services now always use the exact number of intro points
1780 configured with the HiddenServiceNumIntroductionPoints option (or
1781 fewer if nodes are excluded). Before, a service could sometimes
1782 pick more intro points than configured. Fixes bug 31548; bugfix
1785 o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
1786 - Add a "--list-modules" command to print a list of which compile-
1787 time modules are enabled. Closes ticket 30452.
1789 o Minor features (continuous integration, backport from 0.4.1.1-alpha):
1790 - Remove sudo configuration lines from .travis.yml as they are no
1791 longer needed with current Travis build environment. Resolves
1794 o Minor features (continuous integration, backport from 0.4.1.4-rc):
1795 - Our Travis configuration now uses Chutney to run some network
1796 integration tests automatically. Closes ticket 29280.
1798 o Minor features (continuous integration, backport from 0.4.2.2-alpha):
1799 - When building on Appveyor and Travis, pass the "-k" flag to make,
1800 so that we are informed of all compilation failures, not just the
1801 first one or two. Closes ticket 31372.
1803 o Minor features (fallback directory list, backport from 0.4.1.4-rc):
1804 - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
1805 in December 2018 (of which ~122 were still functional), with a
1806 list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
1807 in June 2019. Closes ticket 28795.
1809 o Minor features (geoip, backport from 0.4.2.5):
1810 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
1811 Country database. Closes ticket 32685.
1813 o Minor features (stem tests, backport from 0.4.2.1-alpha):
1814 - Change "make test-stem" so it only runs the stem tests that use
1815 tor. This change makes test-stem faster and more reliable. Closes
1818 o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
1819 - Avoid spurious errors when Appveyor CI fails before the install step.
1820 Fixes bug 31884; bugfix on 0.3.4.2-alpha.
1822 o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
1823 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
1824 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
1826 o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
1827 - Fix a logic error that prevented the SessionGroup sub-option from
1828 being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
1830 o Minor bugfixes (circuit padding, backport from 0.4.1.4-rc):
1831 - On relays, properly check that a padding machine is absent before
1832 logging a warning about it being absent. Fixes bug 30649; bugfix
1835 o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
1836 - Fix a BUG() assertion that occurs within a very small race window
1837 between when a client intro circuit opens and when its descriptor
1838 gets cleaned up from the cache. The circuit is now closed early,
1839 which will trigger a re-fetch of the descriptor and continue the
1840 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
1842 o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
1843 - Don't believe clock skew results from NETINFO cells that appear to
1844 arrive before we sent the VERSIONS cells they are responding to.
1845 Previously, we would accept them up to 3 minutes "in the past".
1846 Fixes bug 31343; bugfix on 0.2.4.4-alpha.
1848 o Minor bugfixes (compilation warning, backport from 0.4.1.5):
1849 - Fix a compilation warning on Windows about casting a function
1850 pointer for GetTickCount64(). Fixes bug 31374; bugfix
1853 o Minor bugfixes (compilation, backport from 0.4.1.5):
1854 - Avoid using labs() on time_t, which can cause compilation warnings
1855 on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
1857 o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
1858 - Suppress spurious float-conversion warnings from GCC when calling
1859 floating-point classifier functions on FreeBSD. Fixes part of bug
1860 31687; bugfix on 0.3.1.5-alpha.
1862 o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
1863 - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
1864 due to missing declarations of abort(), and prevent other such
1865 failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
1867 o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
1868 - Fix a bug that prevented us from supporting SOCKS5 proxies that
1869 want authentication along with configured (but unused!)
1870 ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
1872 o Minor bugfixes (connections, backport from 0.4.2.3-rc):
1873 - Avoid trying to read data from closed connections, which can cause
1874 needless loops in Libevent and infinite loops in Shadow. Fixes bug
1875 30344; bugfix on 0.1.1.1-alpha.
1877 o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
1878 - Allow the test-stem job to fail in Travis, because it sometimes
1879 hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
1880 - Skip test_rebind on macOS in Travis, because it is unreliable on
1881 macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
1882 - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
1883 variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
1885 o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
1886 - Avoid a set of possible code paths that could try to use freed
1887 memory in routerlist_free() while Tor was exiting. Fixes bug
1888 31003; bugfix on 0.1.2.2-alpha.
1890 o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
1891 - Stop crashing after parsing an unknown descriptor purpose
1892 annotation. We think this bug can only be triggered by modifying a
1893 local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
1895 o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
1896 - Move the "bandwidth-file-headers" line in directory authority
1897 votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
1900 o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
1901 - On abort, try harder to flush the output buffers of log messages.
1902 On some platforms (macOS), log messages could be discarded when
1903 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
1904 - Report the tor version whenever an assertion fails. Previously, we
1905 only reported the Tor version on some crashes, and some non-fatal
1906 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
1908 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
1909 - When extracting an IPv6 address from a PF-based proxy, verify that
1910 we are actually configured to receive an IPv6 address, and log an
1911 internal error if not. Fixes part of bug 31687; bugfix
1914 o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
1915 - When tor is missing descriptors for some primary entry guards,
1916 make the log message less alarming. It's normal for descriptors to
1917 expire, as long as tor fetches new ones soon after. Fixes bug
1918 31657; bugfix on 0.3.3.1-alpha.
1920 o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
1921 - Do not log a warning when running with an OpenSSL version other
1922 than the one Tor was compiled with, if the two versions should be
1923 compatible. Previously, we would warn whenever the version was
1924 different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
1926 o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
1927 - Change log level of message "Hash of session info was not as
1928 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
1931 o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
1932 - Rate-limit our the logging message about the obsolete .exit
1933 notation. Previously, there was no limit on this warning, which
1934 could potentially be triggered many times by a hostile website.
1935 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
1937 o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
1938 - Do not log a nonfatal assertion failure when receiving a VERSIONS
1939 cell on a connection using the obsolete v1 link protocol. Log a
1940 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
1942 o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
1943 - Reset the periodic events' "enabled" flag when Tor is shut down
1944 cleanly. Previously, this flag was left on, which caused periodic
1945 events not to be re-enabled when Tor was relaunched in-process
1946 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
1949 o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
1950 - Avoid a minor memory leak that could occur on relays when failing
1951 to create a "keys" directory. Fixes bug 30148; bugfix
1954 o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
1955 - Fix a trivial memory leak when parsing an invalid value
1956 from a download schedule in the configuration. Fixes bug
1957 30894; bugfix on 0.3.4.1-alpha.
1959 o Minor bugfixes (NetBSD, backport from 0.4.1.2-alpha):
1960 - Fix usage of minherit() on NetBSD and other platforms that define
1961 MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
1962 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
1964 o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
1965 - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
1966 implemenation) when failing to load an onion service client
1967 authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
1969 o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
1970 - When purging the DNS cache because of an out-of-memory condition,
1971 try purging just the older entries at first. Previously, we would
1972 always purge the whole thing. Fixes bug 29617; bugfix
1975 o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
1976 - Avoid crashing in our tor_vasprintf() implementation on systems
1977 that define neither vasprintf() nor _vscprintf(). (This bug has
1978 been here long enough that we question whether people are running
1979 Tor on such systems, but we're applying the fix out of caution.)
1980 Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
1983 o Minor bugfixes (process management, backport from 0.4.2.3-alpha):
1984 - Remove overly strict assertions that triggered when a pluggable
1985 transport failed to launch. Fixes bug 31091; bugfix
1987 - Remove an assertion in the Unix process backend. This assertion
1988 would trigger when we failed to find the executable for a child
1989 process. Fixes bug 31810; bugfix on 0.4.0.1-alpha.
1991 o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
1992 - Avoid crashing when starting with a corrupt keys directory where
1993 the old ntor key and the new ntor key are identical. Fixes bug
1994 30916; bugfix on 0.2.4.8-alpha.
1996 o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
1997 - Correctly exclude a redundant rust build job in Travis. Fixes bug
1998 31463; bugfix on 0.3.5.4-alpha.
2000 o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
2001 - When testing port rebinding, don't busy-wait for tor to log.
2002 Instead, actually sleep for a short time before polling again.
2003 Also improve the formatting of control commands and log messages.
2004 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
2006 o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
2007 - Log bugs about the TLS read buffer's length only once, rather than
2008 filling the logs with similar warnings. Fixes bug 31939; bugfix
2011 o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
2012 - Always retry v2 single onion service intro and rend circuits with
2013 a 3-hop path. Previously, v2 single onion services used a 3-hop
2014 path when rendezvous circuits were retried after a remote or
2015 delayed failure, but a 1-hop path for immediate retries. Fixes bug
2016 23818; bugfix on 0.2.9.3-alpha.
2017 - Make v3 single onion services fall back to a 3-hop intro, when all
2018 intro points are unreachable via a 1-hop path. Previously, v3
2019 single onion services failed when all intro nodes were unreachable
2020 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
2022 o Documentation (backport from 0.4.2.1-alpha):
2023 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
2024 notice.html so that operators no longer have to host it
2025 themselves. Closes ticket 31089.
2027 o Testing (backport from 0.4.1.2-alpha):
2028 - Specify torrc paths (with empty files) when launching tor in
2029 integration tests; refrain from reading user and system torrcs.
2030 Resolves issue 29702.
2032 o Testing (continuous integration, backport from 0.4.1.1-alpha):
2033 - In Travis, show stem's tor log after failure. Closes ticket 30234.
2035 o Testing (continuous integration, backport from 0.4.1.5):
2036 - In Travis, make stem log a controller trace to the console, and
2037 tail stem's tor log after failure. Closes ticket 30591.
2038 - In Travis, only run the stem tests that use a tor binary. Closes
2041 o Testing (continuous integration, backport from 0.4.2.3-alpha):
2042 - Disable all but one Travis CI macOS build, to mitigate slow
2043 scheduling of Travis macOS jobs. Closes ticket 32177.
2044 - Run the chutney IPv6 networks as part of Travis CI. Closes
2046 - Simplify the Travis CI build matrix, and optimise for build time.
2047 Closes ticket 31859.
2048 - Use Windows Server 2019 instead of Windows Server 2016 in our
2049 Appveyor builds. Closes ticket 32086.
2051 o Testing (continuous integration, backport from 0.4.2.4-rc):
2052 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
2053 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
2054 until we can fix some Bionic permissions issues (see ticket
2055 32240). Related to ticket 31919.
2056 - Install the mingw OpenSSL package in Appveyor. This makes sure
2057 that the OpenSSL headers and libraries match in Tor's Appveyor
2058 builds. (This bug was triggered by an Appveyor image update.)
2059 Fixes bug 32449; bugfix on 0.3.5.6-rc.
2060 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
2062 o Testing (continuous integration, backport from 0.4.2.5):
2063 - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
2064 extensions. Also activates clang's -Wtypedef-redefinition warnings.
2065 Build some jobs with -std=gnu99, and some jobs without.
2066 Closes ticket 32500.
2069 Changes in version 0.3.5.9 - 2019-12-09
2070 Tor 0.3.5.9 backports serveral fixes from later releases, including
2071 several that affect bridge users, relay stability, onion services,
2074 o Directory authority changes (backport from 0.4.1.5):
2075 - The directory authority "dizum" has a new IP address. Closes
2078 o Major bugfixes (bridges, backport from 0.4.1.2-alpha):
2079 - Consider our directory information to have changed when our list
2080 of bridges changes. Previously, Tor would not re-compute the
2081 status of its directory information when bridges changed, and
2082 therefore would not realize that it was no longer able to build
2083 circuits. Fixes part of bug 29875.
2084 - Do not count previously configured working bridges towards our
2085 total of working bridges. Previously, when Tor's list of bridges
2086 changed, it would think that the old bridges were still usable,
2087 and delay fetching router descriptors for the new ones. Fixes part
2088 of bug 29875; bugfix on 0.3.0.1-alpha.
2090 o Major bugfixes (circuit build, guard, backport from 0.4.1.4-rc):
2091 - When considering upgrading circuits from "waiting for guard" to
2092 "open", always ignore circuits that are marked for close. Otherwise,
2093 we can end up in the situation where a subsystem is notified that
2094 a closing circuit has just opened, leading to undesirable
2095 behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
2097 o Major bugfixes (NSS, relay, backport from 0.4.0.4-rc):
2098 - When running with NSS, disable TLS 1.2 ciphersuites that use
2099 SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
2100 these ciphersuites don't work -- which caused relays to fail to
2101 handshake with one another when these ciphersuites were enabled.
2102 Fixes bug 29241; bugfix on 0.3.5.1-alpha.
2104 o Major bugfixes (Onion service reachability, backport from 0.4.1.3-alpha):
2105 - Properly clean up the introduction point map when circuits change
2106 purpose from onion service circuits to pathbias, measurement, or
2107 other circuit types. This should fix some service-side instances
2108 of introduction point failure. Fixes bug 29034; bugfix
2111 o Major bugfixes (onion service v3, backport from 0.4.1.1-alpha):
2112 - Fix an unreachable bug in which an introduction point could try to
2113 send an INTRODUCE_ACK with a status code that Trunnel would refuse
2114 to encode, leading the relay to assert(). We've consolidated the
2115 ABI values into Trunnel now. Fixes bug 30454; bugfix
2117 - Clients can now handle unknown status codes from INTRODUCE_ACK
2118 cells. (The NACK behavior will stay the same.) This will allow us
2119 to extend status codes in the future without breaking the normal
2120 client behavior. Fixes another part of bug 30454; bugfix
2123 o Major bugfixes (torrc parsing, backport from 0.4.2.2-alpha):
2124 - Stop ignoring torrc options after an %include directive, when the
2125 included directory ends with a file that does not contain any
2126 config options (but does contain comments or whitespace). Fixes
2127 bug 31408; bugfix on 0.3.1.1-alpha.
2129 o Major bugfixes (v3 onion services, backport from 0.4.2.3-alpha):
2130 - Onion services now always use the exact number of intro points
2131 configured with the HiddenServiceNumIntroductionPoints option (or
2132 fewer if nodes are excluded). Before, a service could sometimes
2133 pick more intro points than configured. Fixes bug 31548; bugfix
2136 o Minor features (address selection, backport from 0.4.0.3-alpha):
2137 - Treat the subnet 100.64.0.0/10 as public for some purposes;
2138 private for others. This subnet is the RFC 6598 (Carrier Grade
2139 NAT) IP range, and is deployed by many ISPs as an alternative to
2140 RFC 1918 that does not break existing internal networks. Tor now
2141 blocks SOCKS and control ports on these addresses and warns users
2142 if client ports or ExtORPorts are listening on a RFC 6598 address.
2143 Closes ticket 28525. Patch by Neel Chauhan.
2145 o Minor features (bandwidth authority, backport from 0.4.0.4-rc):
2146 - Make bandwidth authorities ignore relays that are reported in the
2147 bandwidth file with the flag "vote=0". This change allows us to
2148 report unmeasured relays for diagnostic reasons without including
2149 their bandwidth in the bandwidth authorities' vote. Closes
2152 o Minor features (compile-time modules, backport from version 0.4.1.1-alpha):
2153 - Add a "--list-modules" command to print a list of which compile-
2154 time modules are enabled. Closes ticket 30452.
2156 o Minor features (continuous integration, backport from 0.4.0.4-rc):
2157 - On Travis Rust builds, cleanup Rust registry and refrain from
2158 caching the "target/" directory to speed up builds. Resolves
2161 o Minor features (continuous integration, backport from 0.4.0.5):
2162 - In Travis, tell timelimit to use stem's backtrace signals, and
2163 launch python directly from timelimit, so python receives the
2164 signals from timelimit, rather than make. Closes ticket 30117.
2166 o Minor features (continuous integration, backport from 0.4.1.1-alpha):
2167 - Remove sudo configuration lines from .travis.yml as they are no
2168 longer needed with current Travis build environment. Resolves
2171 o Minor features (continuous integration, backport from 0.4.1.4-rc):
2172 - Our Travis configuration now uses Chutney to run some network
2173 integration tests automatically. Closes ticket 29280.
2175 o Minor features (continuous integration, backport from 0.4.2.2-alpha):
2176 - When building on Appveyor and Travis, pass the "-k" flag to make,
2177 so that we are informed of all compilation failures, not just the
2178 first one or two. Closes ticket 31372.
2180 o Minor features (fallback directory list, backport from 0.4.1.4-rc):
2181 - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
2182 in December 2018 (of which ~122 were still functional), with a
2183 list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
2184 in June 2019. Closes ticket 28795.
2186 o Minor features (geoip, backport from 0.4.2.5):
2187 - Update geoip and geoip6 to the December 3 2019 Maxmind GeoLite2
2188 Country database. Closes ticket 32685.
2190 o Minor features (NSS, diagnostic, backport from 0.4.0.4-rc):
2191 - Try to log an error from NSS (if there is any) and a more useful
2192 description of our situation if we are using NSS and a call to
2193 SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
2195 o Minor features (stem tests, backport from 0.4.2.1-alpha):
2196 - Change "make test-stem" so it only runs the stem tests that use
2197 tor. This change makes test-stem faster and more reliable. Closes
2200 o Minor bugfixes (security, backport from 0.4.0.4-rc):
2201 - Verify in more places that we are not about to create a buffer
2202 with more than INT_MAX bytes, to avoid possible OOB access in the
2203 event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
2204 fixed by Tobias Stoeckmann.
2205 - Fix a potential double free bug when reading huge bandwidth files.
2206 The issue is not exploitable in the current Tor network because
2207 the vulnerable code is only reached when directory authorities
2208 read bandwidth files, but bandwidth files come from a trusted
2209 source (usually the authorities themselves). Furthermore, the
2210 issue is only exploitable in rare (non-POSIX) 32-bit architectures,
2211 which are not used by any of the current authorities. Fixes bug
2212 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
2215 o Minor bugfix (continuous integration, backport from 0.4.0.4-rc):
2216 - Reset coverage state on disk after Travis CI has finished. This
2217 should prevent future coverage merge errors from causing the test
2218 suite for the "process" subsystem to fail. The process subsystem
2219 was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
2221 - Terminate test-stem if it takes more than 9.5 minutes to run.
2222 (Travis terminates the job after 10 minutes of no output.)
2223 Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
2225 o Minor bugfixes (Appveyor CI, backport from 0.4.2.2-alpha):
2226 - Avoid spurious errors when Appveyor CI fails before the install step.
2227 Fixes bug 31884; bugfix on 0.3.4.2-alpha.
2229 o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
2230 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
2231 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
2233 o Minor bugfixes (C correctness, backport from 0.4.0.4-rc):
2234 - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
2235 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
2238 o Minor bugfixes (circuit isolation, backport from 0.4.1.3-alpha):
2239 - Fix a logic error that prevented the SessionGroup sub-option from
2240 being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
2242 o Minor bugfixes (client, onion service v3, backport from 0.4.2.4-rc):
2243 - Fix a BUG() assertion that occurs within a very small race window
2244 between when a client intro circuit opens and when its descriptor
2245 gets cleaned up from the cache. The circuit is now closed early,
2246 which will trigger a re-fetch of the descriptor and continue the
2247 connection. Fixes bug 28970; bugfix on 0.3.2.1-alpha.
2249 o Minor bugfixes (clock skew detection, backport from 0.4.1.5):
2250 - Don't believe clock skew results from NETINFO cells that appear to
2251 arrive before we sent the VERSIONS cells they are responding to.
2252 Previously, we would accept them up to 3 minutes "in the past".
2253 Fixes bug 31343; bugfix on 0.2.4.4-alpha.
2255 o Minor bugfixes (compilation warning, backport from 0.4.1.5):
2256 - Fix a compilation warning on Windows about casting a function
2257 pointer for GetTickCount64(). Fixes bug 31374; bugfix
2260 o Minor bugfixes (compilation, backport from 0.4.0.2-alpha):
2261 - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
2262 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
2264 o Minor bugfixes (compilation, backport from 0.4.1.5):
2265 - Avoid using labs() on time_t, which can cause compilation warnings
2266 on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
2268 o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
2269 - Suppress spurious float-conversion warnings from GCC when calling
2270 floating-point classifier functions on FreeBSD. Fixes part of bug
2271 31687; bugfix on 0.3.1.5-alpha.
2273 o Minor bugfixes (compilation, unusual configurations, backport from 0.4.1.1-alpha):
2274 - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
2275 due to missing declarations of abort(), and prevent other such
2276 failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
2278 o Minor bugfixes (configuration, proxies, backport from 0.4.1.2-alpha):
2279 - Fix a bug that prevented us from supporting SOCKS5 proxies that
2280 want authentication along with configured (but unused!)
2281 ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
2283 o Minor bugfixes (connections, backport from 0.4.2.3-rc):
2284 - Avoid trying to read data from closed connections, which can cause
2285 needless loops in Libevent and infinite loops in Shadow. Fixes bug
2286 30344; bugfix on 0.1.1.1-alpha.
2288 o Minor bugfixes (continuous integration, backport from 0.4.1.3-alpha):
2289 - Allow the test-stem job to fail in Travis, because it sometimes
2290 hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
2291 - Skip test_rebind on macOS in Travis, because it is unreliable on
2292 macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
2293 - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
2294 variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
2296 o Minor bugfixes (crash on exit, backport from 0.4.1.4-rc):
2297 - Avoid a set of possible code paths that could try to use freed
2298 memory in routerlist_free() while Tor was exiting. Fixes bug
2299 31003; bugfix on 0.1.2.2-alpha.
2301 o Minor bugfixes (directory authorities, backport from 0.4.1.3-alpha):
2302 - Stop crashing after parsing an unknown descriptor purpose
2303 annotation. We think this bug can only be triggered by modifying a
2304 local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
2306 o Minor bugfixes (directory authority, backport from 0.4.1.2-alpha):
2307 - Move the "bandwidth-file-headers" line in directory authority
2308 votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
2311 o Minor bugfixes (error handling, backport from 0.4.2.1-alpha):
2312 - On abort, try harder to flush the output buffers of log messages.
2313 On some platforms (macOS), log messages could be discarded when
2314 the process terminates. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
2315 - Report the tor version whenever an assertion fails. Previously, we
2316 only reported the Tor version on some crashes, and some non-fatal
2317 assertions. Fixes bug 31571; bugfix on 0.3.5.1-alpha.
2319 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
2320 - When extracting an IPv6 address from a PF-based proxy, verify that
2321 we are actually configured to receive an IPv6 address, and log an
2322 internal error if not. Fixes part of bug 31687; bugfix
2325 o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
2326 - When tor is missing descriptors for some primary entry guards,
2327 make the log message less alarming. It's normal for descriptors to
2328 expire, as long as tor fetches new ones soon after. Fixes bug
2329 31657; bugfix on 0.3.3.1-alpha.
2331 o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
2332 - Avoid logging that we are relaxing a circuit timeout when that
2333 timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
2335 o Minor bugfixes (logging, backport from 0.4.0.3-alpha):
2336 - Correct a misleading error message when IPv4Only or IPv6Only is
2337 used but the resolved address can not be interpreted as an address
2338 of the specified IP version. Fixes bug 13221; bugfix on
2339 0.2.3.9-alpha. Patch from Kris Katterjohn.
2340 - Log the correct port number for listening sockets when "auto" is
2341 used to let Tor pick the port number. Previously, port 0 was
2342 logged instead of the actual port number. Fixes bug 29144; bugfix
2343 on 0.3.5.1-alpha. Patch from Kris Katterjohn.
2344 - Stop logging a BUG() warning when Tor is waiting for exit
2345 descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
2347 o Minor bugfixes (logging, backport from 0.4.1.1-alpha):
2348 - Do not log a warning when running with an OpenSSL version other
2349 than the one Tor was compiled with, if the two versions should be
2350 compatible. Previously, we would warn whenever the version was
2351 different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
2353 o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
2354 - Change log level of message "Hash of session info was not as
2355 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
2358 o Minor bugfixes (logging, backport from 0.4.2.2-alpha):
2359 - Rate-limit our the logging message about the obsolete .exit
2360 notation. Previously, there was no limit on this warning, which
2361 could potentially be triggered many times by a hostile website.
2362 Fixes bug 31466; bugfix on 0.2.2.1-alpha.
2364 o Minor bugfixes (logging, protocol violations, backport from 0.4.2.2-alpha):
2365 - Do not log a nonfatal assertion failure when receiving a VERSIONS
2366 cell on a connection using the obsolete v1 link protocol. Log a
2367 protocol_warn instead. Fixes bug 31107; bugfix on 0.2.4.4-alpha.
2369 o Minor bugfixes (mainloop, periodic events, in-process API, backport from 0.4.2.3-alpha):
2370 - Reset the periodic events' "enabled" flag when Tor is shut down
2371 cleanly. Previously, this flag was left on, which caused periodic
2372 events not to be re-enabled when Tor was relaunched in-process
2373 with tor_api.h after a shutdown. Fixes bug 32058; bugfix
2376 o Minor bugfixes (memory leak, backport from 0.4.1.1-alpha):
2377 - Avoid a minor memory leak that could occur on relays when failing
2378 to create a "keys" directory. Fixes bug 30148; bugfix
2381 o Minor bugfixes (memory leak, backport from 0.4.1.4-rc):
2382 - Fix a trivial memory leak when parsing an invalid value
2383 from a download schedule in the configuration. Fixes bug
2384 30894; bugfix on 0.3.4.1-alpha.
2386 o Minor bugfixes (memory management, backport from 0.4.0.3-alpha):
2387 - Refactor the shared random state's memory management so that it
2388 actually takes ownership of the shared random value pointers.
2389 Fixes bug 29706; bugfix on 0.2.9.1-alpha.
2391 o Minor bugfixes (memory management, testing, backport from 0.4.0.3-alpha):
2392 - Stop leaking parts of the shared random state in the shared-random
2393 unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
2395 o Minor bugfixes (onion services, backport from 0.4.1.1-alpha):
2396 - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
2397 implemenation) when failing to load an onion service client
2398 authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
2400 o Minor bugfixes (out-of-memory handler, backport from 0.4.1.2-alpha):
2401 - When purging the DNS cache because of an out-of-memory condition,
2402 try purging just the older entries at first. Previously, we would
2403 always purge the whole thing. Fixes bug 29617; bugfix
2406 o Minor bugfixes (portability, backport from 0.4.1.2-alpha):
2407 - Avoid crashing in our tor_vasprintf() implementation on systems
2408 that define neither vasprintf() nor _vscprintf(). (This bug has
2409 been here long enough that we question whether people are running
2410 Tor on such systems, but we're applying the fix out of caution.)
2411 Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
2414 o Minor bugfixes (relay, backport from 0.4.2.2-alpha):
2415 - Avoid crashing when starting with a corrupt keys directory where
2416 the old ntor key and the new ntor key are identical. Fixes bug
2417 30916; bugfix on 0.2.4.8-alpha.
2419 o Minor bugfixes (rust, backport from 0.4.0.5):
2420 - Abort on panic in all build profiles, instead of potentially
2421 unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
2423 o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
2424 - Correctly exclude a redundant rust build job in Travis. Fixes bug
2425 31463; bugfix on 0.3.5.4-alpha.
2427 o Minor bugfixes (single onion services, backport from 0.4.0.3-alpha):
2428 - Allow connections to single onion services to remain idle without
2429 being disconnected. Previously, relays acting as rendezvous points
2430 for single onion services were mistakenly closing idle rendezvous
2431 circuits after 60 seconds, thinking that they were unused
2432 directory-fetching circuits that had served their purpose. Fixes
2433 bug 29665; bugfix on 0.2.1.26.
2435 o Minor bugfixes (stats, backport from 0.4.0.3-alpha):
2436 - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
2437 relay and bridge extra-info documents. Fixes bug 29017; bugfix
2440 o Minor bugfixes (testing, backport from 0.4.0.3-alpha):
2441 - Downgrade some LOG_ERR messages in the address/* tests to
2442 warnings. The LOG_ERR messages were occurring when we had no
2443 configured network. We were failing the unit tests, because we
2444 backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
2445 29530; bugfix on 0.3.5.8.
2446 - Fix our gcov wrapper script to look for object files at the
2447 correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
2449 o Minor bugfixes (testing, backport from 0.4.0.4-rc):
2450 - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
2451 recent test-network.sh to use new chutney features in CI. Fixes
2452 bug 29703; bugfix on 0.2.9.1-alpha.
2453 - Fix a test failure on Windows caused by an unexpected "BUG"
2454 warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
2457 o Minor bugfixes (testing, backport from 0.4.2.3-alpha):
2458 - When testing port rebinding, don't busy-wait for tor to log.
2459 Instead, actually sleep for a short time before polling again.
2460 Also improve the formatting of control commands and log messages.
2461 Fixes bug 31837; bugfix on 0.3.5.1-alpha.
2463 o Minor bugfixes (TLS protocol, backport form 0.4.0.4-rc):
2464 - When classifying a client's selection of TLS ciphers, if the
2465 client ciphers are not yet available, do not cache the result.
2466 Previously, we had cached the unavailability of the cipher list
2467 and never looked again, which in turn led us to assume that the
2468 client only supported the ancient V1 link protocol. This, in turn,
2469 was causing Stem integration tests to stall in some cases. Fixes
2470 bug 30021; bugfix on 0.2.4.8-alpha.
2472 o Minor bugfixes (tls, logging, backport from 0.4.2.3-alpha):
2473 - Log bugs about the TLS read buffer's length only once, rather than
2474 filling the logs with similar warnings. Fixes bug 31939; bugfix
2477 o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
2478 - Always retry v2 single onion service intro and rend circuits with
2479 a 3-hop path. Previously, v2 single onion services used a 3-hop
2480 path when rendezvous circuits were retried after a remote or
2481 delayed failure, but a 1-hop path for immediate retries. Fixes bug
2482 23818; bugfix on 0.2.9.3-alpha.
2483 - Make v3 single onion services fall back to a 3-hop intro, when all
2484 intro points are unreachable via a 1-hop path. Previously, v3
2485 single onion services failed when all intro nodes were unreachable
2486 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
2488 o Minor bugfixes (Windows, CI, backport from 0.4.0.3-alpha):
2489 - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
2490 Windows Server 2012 R2 job. The remaining 2 jobs still provide
2491 coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
2492 fast_finish, so failed jobs terminate the build immediately. Fixes
2493 bug 29601; bugfix on 0.3.5.4-alpha.
2495 o Documentation (backport from 0.4.2.1-alpha):
2496 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
2497 notice.html so that operators no longer have to host it
2498 themselves. Closes ticket 31089.
2500 o Testing (backport from 0.4.1.2-alpha):
2501 - Specify torrc paths (with empty files) when launching tor in
2502 integration tests; refrain from reading user and system torrcs.
2503 Resolves issue 29702.
2505 o Testing (continuous integration, backport from 0.4.1.1-alpha):
2506 - In Travis, show stem's tor log after failure. Closes ticket 30234.
2508 o Testing (continuous integration, backport from 0.4.1.5):
2509 - In Travis, make stem log a controller trace to the console, and
2510 tail stem's tor log after failure. Closes ticket 30591.
2511 - In Travis, only run the stem tests that use a tor binary. Closes
2514 o Testing (continuous integration, backport from 0.4.2.3-alpha):
2515 - Disable all but one Travis CI macOS build, to mitigate slow
2516 scheduling of Travis macOS jobs. Closes ticket 32177.
2517 - Run the chutney IPv6 networks as part of Travis CI. Closes
2519 - Simplify the Travis CI build matrix, and optimise for build time.
2520 Closes ticket 31859.
2521 - Use Windows Server 2019 instead of Windows Server 2016 in our
2522 Appveyor builds. Closes ticket 32086.
2524 o Testing (continuous integration, backport from 0.4.2.4-rc):
2525 - Use Ubuntu Bionic images for our Travis CI builds, so we can get a
2526 recent version of coccinelle. But leave chutney on Ubuntu Trusty,
2527 until we can fix some Bionic permissions issues (see ticket
2528 32240). Related to ticket 31919.
2529 - Install the mingw OpenSSL package in Appveyor. This makes sure
2530 that the OpenSSL headers and libraries match in Tor's Appveyor
2531 builds. (This bug was triggered by an Appveyor image update.)
2532 Fixes bug 32449; bugfix on 0.3.5.6-rc.
2533 - In Travis, use Xcode 11.2 on macOS 10.14. Closes ticket 32241.
2535 o Testing (continuous integration, backport from 0.4.2.5):
2536 - Require C99 standards-conforming code in Travis CI, but allow GNU gcc
2537 extensions. Also activates clang's -Wtypedef-redefinition warnings.
2538 Build some jobs with -std=gnu99, and some jobs without.
2539 Closes ticket 32500.
2542 Changes in version 0.4.1.6 - 2019-09-19
2543 This release backports several bugfixes to improve stability and
2544 correctness. Anyone experiencing build problems or crashes with 0.4.1.5,
2545 or experiencing reliability issues with single onion services, should
2548 o Major bugfixes (crash, Linux, Android, backport from 0.4.2.1-alpha):
2549 - Tolerate systems (including some Android installations) where
2550 madvise and MADV_DONTDUMP are available at build-time, but not at
2551 run time. Previously, these systems would notice a failed syscall
2552 and abort. Fixes bug 31570; bugfix on 0.4.1.1-alpha.
2553 - Tolerate systems (including some Linux installations) where
2554 madvise and/or MADV_DONTFORK are available at build-time, but not
2555 at run time. Previously, these systems would notice a failed
2556 syscall and abort. Fixes bug 31696; bugfix on 0.4.1.1-alpha.
2558 o Minor features (stem tests, backport from 0.4.2.1-alpha):
2559 - Change "make test-stem" so it only runs the stem tests that use
2560 tor. This change makes test-stem faster and more reliable. Closes
2563 o Minor bugfixes (build system, backport form 0.4.2.1-alpha):
2564 - Do not include the deprecated <sys/sysctl.h> on Linux or Windows
2565 systems. Fixes bug 31673; bugfix on 0.2.5.4-alpha.
2567 o Minor bugfixes (compilation, backport from 0.4.2.1-alpha):
2568 - Add more stub functions to fix compilation on Android with link-
2569 time optimization when --disable-module-dirauth is used.
2570 Previously, these compilation settings would make the compiler
2571 look for functions that didn't exist. Fixes bug 31552; bugfix
2573 - Suppress spurious float-conversion warnings from GCC when calling
2574 floating-point classifier functions on FreeBSD. Fixes part of bug
2575 31687; bugfix on 0.3.1.5-alpha.
2577 o Minor bugfixes (controller protocol):
2578 - Fix the MAPADDRESS controller command to accept one or more
2579 arguments. Previously, it required two or more arguments, and ignored
2580 the first. Fixes bug 31772; bugfix on 0.4.1.1-alpha.
2582 o Minor bugfixes (FreeBSD, PF-based proxy, IPv6, backport from 0.4.2.1-alpha):
2583 - When extracting an IPv6 address from a PF-based proxy, verify that
2584 we are actually configured to receive an IPv6 address, and log an
2585 internal error if not. Fixes part of bug 31687; bugfix
2588 o Minor bugfixes (guards, backport from 0.4.2.1-alpha):
2589 - When tor is missing descriptors for some primary entry guards,
2590 make the log message less alarming. It's normal for descriptors to
2591 expire, as long as tor fetches new ones soon after. Fixes bug
2592 31657; bugfix on 0.3.3.1-alpha.
2594 o Minor bugfixes (logging, backport from 0.4.2.1-alpha):
2595 - Change log level of message "Hash of session info was not as
2596 expected" to LOG_PROTOCOL_WARN. Fixes bug 12399; bugfix
2599 o Minor bugfixes (rust, backport from 0.4.2.1-alpha):
2600 - Correctly exclude a redundant rust build job in Travis. Fixes bug
2601 31463; bugfix on 0.3.5.4-alpha.
2603 o Minor bugfixes (v2 single onion services, backport from 0.4.2.1-alpha):
2604 - Always retry v2 single onion service intro and rend circuits with
2605 a 3-hop path. Previously, v2 single onion services used a 3-hop
2606 path when rendezvous circuits were retried after a remote or
2607 delayed failure, but a 1-hop path for immediate retries. Fixes bug
2608 23818; bugfix on 0.2.9.3-alpha.
2610 o Minor bugfixes (v3 single onion services, backport from 0.4.2.1-alpha):
2611 - Always retry v3 single onion service intro and rend circuits with
2612 a 3-hop path. Previously, v3 single onion services used a 3-hop
2613 path when rend circuits were retried after a remote or delayed
2614 failure, but a 1-hop path for immediate retries. Fixes bug 23818;
2615 bugfix on 0.3.2.1-alpha.
2616 - Make v3 single onion services fall back to a 3-hop intro, when all
2617 intro points are unreachable via a 1-hop path. Previously, v3
2618 single onion services failed when all intro nodes were unreachable
2619 via a 1-hop path. Fixes bug 23507; bugfix on 0.3.2.1-alpha.
2621 o Documentation (backport from 0.4.2.1-alpha):
2622 - Use RFC 2397 data URL scheme to embed an image into tor-exit-
2623 notice.html so that operators no longer have to host it
2624 themselves. Closes ticket 31089.
2627 Changes in version 0.4.1.5 - 2019-08-20
2628 This is the first stable release in the 0.4.1.x series. This series
2629 adds experimental circuit-level padding, authenticated SENDME cells to
2630 defend against certain attacks, and several performance improvements
2631 to save on CPU consumption. It fixes bugs in bootstrapping and v3
2632 onion services. It also includes numerous smaller features and
2633 bugfixes on earlier versions.
2635 Per our support policy, we will support the 0.4.1.x series for nine
2636 months, or until three months after the release of a stable 0.4.2.x:
2637 whichever is longer. If you need longer-term support, please stick
2638 with 0.3.5.x, which will we plan to support until Feb 2022.
2640 Below are the changes since 0.4.0.5. For a list of only the changes
2641 since 0.4.1.4-rc, see the ChangeLog file.
2643 o Directory authority changes:
2644 - The directory authority "dizum" has a new IP address. Closes
2647 o Major features (circuit padding):
2648 - Onion service clients now add padding cells at the start of their
2649 INTRODUCE and RENDEZVOUS circuits, to make those circuits' traffic
2650 look more like general purpose Exit traffic. The overhead for this
2651 is 2 extra cells in each direction for RENDEZVOUS circuits, and 1
2652 extra upstream cell and 10 downstream cells for INTRODUCE
2653 circuits. This feature is only enabled when also supported by the
2654 circuit's middle node. (Clients may specify fixed middle nodes
2655 with the MiddleNodes option, and may force-disable this feature
2656 with the CircuitPadding option.) Closes ticket 28634.
2658 o Major features (code organization):
2659 - Tor now includes a generic publish-subscribe message-passing
2660 subsystem that we can use to organize intermodule dependencies. We
2661 hope to use this to reduce dependencies between modules that don't
2662 need to be related, and to generally simplify our codebase. Closes
2665 o Major features (controller protocol):
2666 - Controller commands are now parsed using a generalized parsing
2667 subsystem. Previously, each controller command was responsible for
2668 parsing its own input, which led to strange inconsistencies.
2669 Closes ticket 30091.
2671 o Major features (flow control):
2672 - Implement authenticated SENDMEs as detailed in proposal 289. A
2673 SENDME cell now includes the digest of the traffic that it
2674 acknowledges, so that once an end point receives the SENDME, it
2675 can confirm the other side's knowledge of the previous cells that
2676 were sent, and prevent certain types of denial-of-service attacks.
2677 This behavior is controlled by two new consensus parameters: see
2678 the proposal for more details. Fixes ticket 26288.
2680 o Major features (performance):
2681 - Our node selection algorithm now excludes nodes in linear time.
2682 Previously, the algorithm was quadratic, which could slow down
2683 heavily used onion services. Closes ticket 30307.
2685 o Major features (performance, RNG):
2686 - Tor now constructs a fast secure pseudorandom number generator for
2687 each thread, to use when performance is critical. This PRNG is
2688 based on AES-CTR, using a buffering construction similar to
2689 libottery and the (newer) OpenBSD arc4random() code. It
2690 outperforms OpenSSL 1.1.1a's CSPRNG by roughly a factor of 100 for
2691 small outputs. Although we believe it to be cryptographically
2692 strong, we are only using it when necessary for performance.
2693 Implements tickets 29023 and 29536.
2695 o Major bugfixes (bridges):
2696 - Consider our directory information to have changed when our list
2697 of bridges changes. Previously, Tor would not re-compute the
2698 status of its directory information when bridges changed, and
2699 therefore would not realize that it was no longer able to build
2700 circuits. Fixes part of bug 29875.
2701 - Do not count previously configured working bridges towards our
2702 total of working bridges. Previously, when Tor's list of bridges
2703 changed, it would think that the old bridges were still usable,
2704 and delay fetching router descriptors for the new ones. Fixes part
2705 of bug 29875; bugfix on 0.3.0.1-alpha.
2707 o Major bugfixes (circuit build, guard):
2708 - On relays, properly check that a padding machine is absent before
2709 logging a warning about it being absent. Fixes bug 30649; bugfix
2711 - When considering upgrading circuits from "waiting for guard" to
2712 "open", always ignore circuits that are marked for close. Otherwise,
2713 we can end up in the situation where a subsystem is notified that
2714 a closing circuit has just opened, leading to undesirable
2715 behavior. Fixes bug 30871; bugfix on 0.3.0.1-alpha.
2717 o Major bugfixes (onion service reachability):
2718 - Properly clean up the introduction point map when circuits change
2719 purpose from onion service circuits to pathbias, measurement, or
2720 other circuit types. This should fix some service-side instances
2721 of introduction point failure. Fixes bug 29034; bugfix
2724 o Major bugfixes (onion service v3):
2725 - Fix an unreachable bug in which an introduction point could try to
2726 send an INTRODUCE_ACK with a status code that Trunnel would refuse
2727 to encode, leading the relay to assert(). We've consolidated the
2728 ABI values into Trunnel now. Fixes bug 30454; bugfix
2730 - Clients can now handle unknown status codes from INTRODUCE_ACK
2731 cells. (The NACK behavior will stay the same.) This will allow us
2732 to extend status codes in the future without breaking the normal
2733 client behavior. Fixes another part of bug 30454; bugfix
2736 o Minor features (authenticated SENDME):
2737 - Ensure that there is enough randomness on every circuit to prevent
2738 an attacker from successfully predicting the hashes they will need
2739 to include in authenticated SENDME cells. At a random interval, if
2740 we have not sent randomness already, we now leave some extra space
2741 at the end of a cell that we can fill with random bytes. Closes
2744 o Minor features (circuit padding logging):
2745 - Demote noisy client-side warn logs about circuit padding to protocol
2746 warnings. Add additional log messages and circuit ID fields to help
2747 with bug 30992 and any other future issues.
2749 o Minor features (circuit padding):
2750 - We now use a fast PRNG when scheduling circuit padding. Part of
2752 - Allow the padding machine designer to pick the edges of their
2753 histogram instead of trying to compute them automatically using an
2754 exponential formula. Resolves some undefined behavior in the case
2755 of small histograms and allows greater flexibility on machine
2756 design. Closes ticket 29298; bugfix on 0.4.0.1-alpha.
2757 - Allow circuit padding machines to hold a circuit open until they
2758 are done padding it. Closes ticket 28780.
2760 o Minor features (compile-time modules):
2761 - Add a "--list-modules" command to print a list of which compile-
2762 time modules are enabled. Closes ticket 30452.
2764 o Minor features (continuous integration):
2765 - Our Travis configuration now uses Chutney to run some network
2766 integration tests automatically. Closes ticket 29280.
2767 - When running coverage builds on Travis, we now set
2768 TOR_TEST_RNG_SEED, to avoid RNG-based coverage differences. Part
2770 - Remove sudo configuration lines from .travis.yml as they are no
2771 longer needed with current Travis build environment. Resolves
2773 - In Travis, show stem's tor log after failure. Closes ticket 30234.
2775 o Minor features (controller):
2776 - Add onion service version 3 support to the HSFETCH command.
2777 Previously, only version 2 onion services were supported. Closes
2778 ticket 25417. Patch by Neel Chauhan.
2780 o Minor features (debugging):
2781 - Introduce tor_assertf() and tor_assertf_nonfatal() to enable
2782 logging of additional information during assert failure. Now we
2783 can use format strings to include information for trouble
2784 shooting. Resolves ticket 29662.
2786 o Minor features (defense in depth):
2787 - In smartlist_remove_keeporder(), set unused pointers to NULL, in
2788 case a bug causes them to be used later. Closes ticket 30176.
2789 Patch from Tobias Stoeckmann.
2790 - Tor now uses a cryptographically strong PRNG even for decisions
2791 that we do not believe are security-sensitive. Previously, for
2792 performance reasons, we had used a trivially predictable linear
2793 congruential generator algorithm for certain load-balancing and
2794 statistical sampling decisions. Now we use our fast RNG in those
2795 cases. Closes ticket 29542.
2797 o Minor features (developer tools):
2798 - Tor's "practracker" test script now checks for files and functions
2799 that seem too long and complicated. Existing overlong functions
2800 and files are accepted for now, but should eventually be
2801 refactored. Closes ticket 29221.
2802 - Add some scripts used for git maintenance to scripts/git. Closes
2804 - Call practracker from pre-push and pre-commit git hooks to let
2805 developers know if they made any code style violations. Closes
2807 - Add a script to check that each header has a well-formed and
2808 unique guard macro. Closes ticket 29756.
2810 o Minor features (fallback directory list):
2811 - Replace the 157 fallbacks originally introduced in Tor 0.3.5.6-rc
2812 in December 2018 (of which ~122 were still functional), with a
2813 list of 148 fallbacks (70 new, 78 existing, 79 removed) generated
2814 in June 2019. Closes ticket 28795.
2816 o Minor features (geoip):
2817 - Update geoip and geoip6 to the June 10 2019 Maxmind GeoLite2
2818 Country database. Closes ticket 30852.
2819 - Update geoip and geoip6 to the May 13 2019 Maxmind GeoLite2
2820 Country database. Closes ticket 30522.
2822 o Minor features (HTTP tunnel):
2823 - Return an informative web page when the HTTPTunnelPort is used as
2824 an HTTP proxy. Closes ticket 27821, patch by "eighthave".
2826 o Minor features (IPv6, v3 onion services):
2827 - Make v3 onion services put IPv6 addresses in service descriptors.
2828 Before this change, service descriptors only contained IPv4
2829 addresses. Implements 26992.
2831 o Minor features (logging):
2832 - Give a more useful assertion failure message if we think we have
2833 minherit() but we fail to make a region non-inheritable. Give a
2834 compile-time warning if our support for minherit() is incomplete.
2835 Closes ticket 30686.
2837 o Minor features (maintenance):
2838 - Add a new "make autostyle" target that developers can use to apply
2839 all automatic Tor style and consistency conversions to the
2840 codebase. Closes ticket 30539.
2842 o Minor features (modularity):
2843 - The "--disable-module-dirauth" compile-time option now disables
2844 even more dirauth-only code. Closes ticket 30345.
2846 o Minor features (performance):
2847 - Use OpenSSL's implementations of SHA3 when available (in OpenSSL
2848 1.1.1 and later), since they tend to be faster than tiny-keccak.
2849 Closes ticket 28837.
2851 o Minor features (testing):
2852 - The circuitpadding tests now use a reproducible RNG implementation,
2853 so that if a test fails, we can learn why. Part of ticket 28878.
2854 - Tor's tests now support an environment variable, TOR_TEST_RNG_SEED,
2855 to set the RNG seed for tests that use a reproducible RNG. Part of
2857 - When running tests in coverage mode, take additional care to make
2858 our coverage deterministic, so that we can accurately track
2859 changes in code coverage. Closes ticket 30519.
2860 - Tor's unit test code now contains helper functions to replace the
2861 PRNG with a deterministic or reproducible version for testing.
2862 Previously, various tests implemented this in various ways.
2863 Implements ticket 29732.
2864 - We now have a script, cov-test-determinism.sh, to identify places
2865 where our unit test coverage has become nondeterministic. Closes
2867 - Check that representative subsets of values of `int` and `unsigned
2868 int` can be represented by `void *`. Resolves issue 29537.
2870 o Minor bugfixes (bridge authority):
2871 - Bridge authorities now set bridges as running or non-running when
2872 about to dump their status to a file. Previously, they set bridges
2873 as running in response to a GETINFO command, but those shouldn't
2874 modify data structures. Fixes bug 24490; bugfix on 0.2.0.13-alpha.
2875 Patch by Neel Chauhan.
2877 o Minor bugfixes (channel padding statistics):
2878 - Channel padding write totals and padding-enabled totals are now
2879 counted properly in relay extrainfo descriptors. Fixes bug 29231;
2880 bugfix on 0.3.1.1-alpha.
2882 o Minor bugfixes (circuit isolation):
2883 - Fix a logic error that prevented the SessionGroup sub-option from
2884 being accepted. Fixes bug 22619; bugfix on 0.2.7.2-alpha.
2886 o Minor bugfixes (circuit padding):
2887 - Add a "CircuitPadding" torrc option to disable circuit padding.
2888 Fixes bug 28693; bugfix on 0.4.0.1-alpha.
2889 - Allow circuit padding machines to specify that they do not
2890 contribute much overhead, and provide consensus flags and torrc
2891 options to force clients to only use these low overhead machines.
2892 Fixes bug 29203; bugfix on 0.4.0.1-alpha.
2893 - Provide a consensus parameter to fully disable circuit padding, to
2894 be used in emergency network overload situations. Fixes bug 30173;
2895 bugfix on 0.4.0.1-alpha.
2896 - The circuit padding subsystem will no longer schedule padding if
2897 dormant mode is enabled. Fixes bug 28636; bugfix on 0.4.0.1-alpha.
2898 - Inspect a circuit-level cell queue before sending padding, to
2899 avoid sending padding while too much data is already queued. Fixes
2900 bug 29204; bugfix on 0.4.0.1-alpha.
2901 - Avoid calling monotime_absolute_usec() in circuit padding machines
2902 that do not use token removal or circuit RTT estimation. Fixes bug
2903 29085; bugfix on 0.4.0.1-alpha.
2905 o Minor bugfixes (clock skew detection):
2906 - Don't believe clock skew results from NETINFO cells that appear to
2907 arrive before we sent the VERSIONS cells they are responding to.
2908 Previously, we would accept them up to 3 minutes "in the past".
2909 Fixes bug 31343; bugfix on 0.2.4.4-alpha.
2911 o Minor bugfixes (compatibility, standards compliance):
2912 - Fix a bug that would invoke undefined behavior on certain
2913 operating systems when trying to asprintf() a string exactly
2914 INT_MAX bytes long. We don't believe this is exploitable, but it's
2915 better to fix it anyway. Fixes bug 31001; bugfix on 0.2.2.11-alpha.
2916 Found and fixed by Tobias Stoeckmann.
2918 o Minor bugfixes (compilation warning):
2919 - Fix a compilation warning on Windows about casting a function
2920 pointer for GetTickCount64(). Fixes bug 31374; bugfix on
2923 o Minor bugfixes (compilation):
2924 - Avoid using labs() on time_t, which can cause compilation warnings
2925 on 64-bit Windows builds. Fixes bug 31343; bugfix on 0.2.4.4-alpha.
2927 o Minor bugfixes (compilation, unusual configurations):
2928 - Avoid failures when building with the ALL_BUGS_ARE_FATAL option
2929 due to missing declarations of abort(), and prevent other such
2930 failures in the future. Fixes bug 30189; bugfix on 0.3.4.1-alpha.
2932 o Minor bugfixes (configuration, proxies):
2933 - Fix a bug that prevented us from supporting SOCKS5 proxies that
2934 want authentication along with configured (but unused!)
2935 ClientTransportPlugins. Fixes bug 29670; bugfix on 0.2.6.1-alpha.
2937 o Minor bugfixes (continuous integration):
2938 - Allow the test-stem job to fail in Travis, because it sometimes
2939 hangs. Fixes bug 30744; bugfix on 0.3.5.4-alpha.
2940 - Skip test_rebind on macOS in Travis, because it is unreliable on
2941 macOS on Travis. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
2942 - Skip test_rebind when the TOR_SKIP_TEST_REBIND environment
2943 variable is set. Fixes bug 30713; bugfix on 0.3.5.1-alpha.
2945 o Minor bugfixes (controller protocol):
2946 - Teach the controller parser to distinguish an object preceded by
2947 an argument list from one without. Previously, it couldn't
2948 distinguish an argument list from the first line of a multiline
2949 object. Fixes bug 29984; bugfix on 0.2.3.8-alpha.
2951 o Minor bugfixes (crash on exit):
2952 - Avoid a set of possible code paths that could try to use freed
2953 memory in routerlist_free() while Tor was exiting. Fixes bug
2954 31003; bugfix on 0.1.2.2-alpha.
2956 o Minor bugfixes (developer tooling):
2957 - Fix pre-push hook to allow fixup and squash commits when pushing
2958 to non-upstream git remote. Fixes bug 30286; bugfix
2961 o Minor bugfixes (directory authorities):
2962 - Stop crashing after parsing an unknown descriptor purpose
2963 annotation. We think this bug can only be triggered by modifying a
2964 local file. Fixes bug 30781; bugfix on 0.2.0.8-alpha.
2965 - Move the "bandwidth-file-headers" line in directory authority
2966 votes so that it conforms to dir-spec.txt. Fixes bug 30316; bugfix
2968 - Directory authorities with IPv6 support now always mark themselves
2969 as reachable via IPv6. Fixes bug 24338; bugfix on 0.2.4.1-alpha.
2970 Patch by Neel Chauhan.
2972 o Minor bugfixes (documentation):
2973 - Improve the documentation for using MapAddress with ".exit". Fixes
2974 bug 30109; bugfix on 0.1.0.1-rc.
2975 - Improve the monotonic time module and function documentation to
2976 explain what "monotonic" actually means, and document some results
2977 that have surprised people. Fixes bug 29640; bugfix
2979 - Use proper formatting when providing an example on quoting options
2980 that contain whitespace. Fixes bug 29635; bugfix on 0.2.3.18-rc.
2982 o Minor bugfixes (logging):
2983 - Do not log a warning when running with an OpenSSL version other
2984 than the one Tor was compiled with, if the two versions should be
2985 compatible. Previously, we would warn whenever the version was
2986 different. Fixes bug 30190; bugfix on 0.2.4.2-alpha.
2987 - Warn operators when the MyFamily option is set but ContactInfo is
2988 missing, as the latter should be set too. Fixes bug 25110; bugfix
2991 o Minor bugfixes (memory leaks):
2992 - Avoid a minor memory leak that could occur on relays when failing
2993 to create a "keys" directory. Fixes bug 30148; bugfix
2995 - Fix a trivial memory leak when parsing an invalid value from a
2996 download schedule in the configuration. Fixes bug 30894; bugfix
2999 o Minor bugfixes (NetBSD):
3000 - Fix usage of minherit() on NetBSD and other platforms that define
3001 MAP_INHERIT_{ZERO,NONE} instead of INHERIT_{ZERO,NONE}. Fixes bug
3002 30614; bugfix on 0.4.0.2-alpha. Patch from Taylor Campbell.
3004 o Minor bugfixes (onion services):
3005 - Avoid a GCC 9.1.1 warning (and possible crash depending on libc
3006 implemenation) when failing to load an onion service client
3007 authorization file. Fixes bug 30475; bugfix on 0.3.5.1-alpha.
3008 - When refusing to launch a controller's HSFETCH request because of
3009 rate-limiting, respond to the controller with a new response,
3010 "QUERY_RATE_LIMITED". Previously, we would log QUERY_NO_HSDIR for
3011 this case. Fixes bug 28269; bugfix on 0.3.1.1-alpha. Patch by
3013 - When relaunching a circuit to a rendezvous service, mark the
3014 circuit as needing high-uptime routers as appropriate. Fixes bug
3015 17357; bugfix on 0.1.0.1-rc. Patch by Neel Chauhan.
3016 - Stop ignoring IPv6 link specifiers sent to v3 onion services.
3017 (IPv6 support for v3 onion services is still incomplete: see
3018 ticket 23493 for details.) Fixes bug 23588; bugfix on
3019 0.3.2.1-alpha. Patch by Neel Chauhan.
3021 o Minor bugfixes (onion services, performance):
3022 - When building circuits to onion services, call tor_addr_parse()
3023 less often. Previously, we called tor_addr_parse() in
3024 circuit_is_acceptable() even if its output wasn't used. This
3025 change should improve performance when building circuits. Fixes
3026 bug 22210; bugfix on 0.2.8.12. Patch by Neel Chauhan.
3028 o Minor bugfixes (out-of-memory handler):
3029 - When purging the DNS cache because of an out-of-memory condition,
3030 try purging just the older entries at first. Previously, we would
3031 always purge the whole thing. Fixes bug 29617; bugfix
3034 o Minor bugfixes (performance):
3035 - When checking whether a node is a bridge, use a fast check to make
3036 sure that its identity is set. Previously, we used a constant-time
3037 check, which is not necessary in this case. Fixes bug 30308;
3038 bugfix on 0.3.5.1-alpha.
3040 o Minor bugfixes (pluggable transports):
3041 - Tor now sets TOR_PT_EXIT_ON_STDIN_CLOSE=1 for client transports as
3042 well as servers. Fixes bug 25614; bugfix on 0.2.7.1-alpha.
3044 o Minor bugfixes (portability):
3045 - Avoid crashing in our tor_vasprintf() implementation on systems
3046 that define neither vasprintf() nor _vscprintf(). (This bug has
3047 been here long enough that we question whether people are running
3048 Tor on such systems, but we're applying the fix out of caution.)
3049 Fixes bug 30561; bugfix on 0.2.8.2-alpha. Found and fixed by
3052 o Minor bugfixes (probability distributions):
3053 - Refactor and improve parts of the probability distribution code
3054 that made Coverity complain. Fixes bug 29805; bugfix
3057 o Minor bugfixes (python):
3058 - Stop assuming that /usr/bin/python3 exists. For scripts that work
3059 with python2, use /usr/bin/python. Otherwise, use /usr/bin/env
3060 python3. Fixes bug 29913; bugfix on 0.2.5.3-alpha.
3062 o Minor bugfixes (relay):
3063 - When running as a relay, if IPv6Exit is set to 1 while ExitRelay
3064 is auto, act as if ExitRelay is 1. Previously, we would ignore
3065 IPv6Exit if ExitRelay was 0 or auto. Fixes bug 29613; bugfix on
3066 0.3.5.1-alpha. Patch by Neel Chauhan.
3068 o Minor bugfixes (static analysis):
3069 - Fix several spurious Coverity warnings about the unit tests, to
3070 lower our chances of missing real warnings in the future. Fixes
3071 bug 30150; bugfix on 0.3.5.1-alpha and various other Tor versions.
3073 o Minor bugfixes (stats):
3074 - When ExtraInfoStatistics is 0, stop including bandwidth usage
3075 statistics, GeoIPFile hashes, ServerTransportPlugin lines, and
3076 bridge statistics by country in extra-info documents. Fixes bug
3077 29018; bugfix on 0.2.4.1-alpha.
3079 o Minor bugfixes (testing):
3080 - Call setrlimit() to disable core dumps in test_bt_cl.c. Previously
3081 we used `ulimit -c` in test_bt.sh, which violates POSIX shell
3082 compatibility. Fixes bug 29061; bugfix on 0.3.5.1-alpha.
3083 - Fix some incorrect code in the v3 onion service unit tests. Fixes
3084 bug 29243; bugfix on 0.3.2.1-alpha.
3085 - In the "routerkeys/*" tests, check the return values of mkdir()
3086 for possible failures. Fixes bug 29939; bugfix on 0.2.7.2-alpha.
3087 Found by Coverity as CID 1444254.
3088 - Split test_utils_general() into several smaller test functions.
3089 This makes it easier to perform resource deallocation on assert
3090 failure, and fixes Coverity warnings CID 1444117 and CID 1444118.
3091 Fixes bug 29823; bugfix on 0.2.9.1-alpha.
3093 o Minor bugfixes (tor-resolve):
3094 - Fix a memory leak in tor-resolve that could happen if Tor gave it
3095 a malformed SOCKS response. (Memory leaks in tor-resolve don't
3096 actually matter, but it's good to fix them anyway.) Fixes bug
3097 30151; bugfix on 0.4.0.1-alpha.
3099 o Code simplification and refactoring:
3100 - Abstract out the low-level formatting of replies on the control
3101 port. Implements ticket 30007.
3102 - Add several assertions in an attempt to fix some Coverity
3103 warnings. Closes ticket 30149.
3104 - Introduce a connection_dir_buf_add() helper function that checks
3105 for compress_state of dir_connection_t and automatically writes a
3106 string to directory connection with or without compression.
3107 Resolves issue 28816.
3108 - Make the base32_decode() API return the number of bytes written,
3109 for consistency with base64_decode(). Closes ticket 28913.
3110 - Move most relay-only periodic events out of mainloop.c into the
3111 relay subsystem. Closes ticket 30414.
3112 - Refactor and encapsulate parts of the codebase that manipulate
3113 crypt_path_t objects. Resolves issue 30236.
3114 - Refactor several places in our code that Coverity incorrectly
3115 believed might have memory leaks. Closes ticket 30147.
3116 - Remove redundant return values in crypto_format, and the
3117 associated return value checks elsewhere in the code. Make the
3118 implementations in crypto_format consistent, and remove redundant
3119 code. Resolves ticket 29660.
3120 - Rename tor_mem_is_zero() to fast_mem_is_zero(), to emphasize that
3121 it is not a constant-time function. Closes ticket 30309.
3122 - Replace hs_desc_link_specifier_t with link_specifier_t, and remove
3123 all hs_desc_link_specifier_t-specific code. Fixes bug 22781;
3124 bugfix on 0.3.2.1-alpha.
3125 - Simplify v3 onion service link specifier handling code. Fixes bug
3126 23576; bugfix on 0.3.2.1-alpha.
3127 - Split crypto_digest.c into NSS code, OpenSSL code, and shared
3128 code. Resolves ticket 29108.
3129 - Split control.c into several submodules, in preparation for
3130 distributing its current responsibilities throughout the codebase.
3131 Closes ticket 29894.
3132 - Start to move responsibility for knowing about periodic events to
3133 the appropriate subsystems, so that the mainloop doesn't need to
3134 know all the periodic events in the rest of the codebase.
3135 Implements tickets 30293 and 30294.
3138 - Mention URLs for Travis/Appveyor/Jenkins in ReleasingTor.md.
3139 Closes ticket 30630.
3140 - Document how to find git commits and tags for bug fixes in
3141 CodingStandards.md. Update some file documentation. Closes
3145 - Remove the linux-tor-prio.sh script from contrib/operator-tools
3146 directory. Resolves issue 29434.
3147 - Remove the obsolete OpenSUSE initscript. Resolves issue 30076.
3148 - Remove the obsolete script at contrib/dist/tor.sh.in. Resolves
3152 - Specify torrc paths (with empty files) when launching tor in
3153 integration tests; refrain from reading user and system torrcs.
3154 Resolves issue 29702.
3156 o Code simplification and refactoring (shell scripts):
3157 - Clean up many of our shell scripts to fix shellcheck warnings.
3158 These include autogen.sh (ticket 26069), test_keygen.sh (ticket
3159 29062), test_switch_id.sh (ticket 29065), test_rebind.sh (ticket
3160 29063), src/test/fuzz/minimize.sh (ticket 30079), test_rust.sh
3161 (ticket 29064), torify (ticket 29070), asciidoc-helper.sh (29926),
3162 fuzz_multi.sh (30077), fuzz_static_testcases.sh (ticket 29059),
3163 nagios-check-tor-authority-cert (ticket 29071),
3164 src/test/fuzz/fixup_filenames.sh (ticket 30078), test-network.sh
3165 (ticket 29060), test_key_expiration.sh (ticket 30002),
3166 zero_length_keys.sh (ticket 29068), and test_workqueue_*.sh
3169 o Testing (chutney):
3170 - In "make test-network-all", test IPv6-only v3 single onion
3171 services, using the chutney network single-onion-v23-ipv6-md.
3172 Closes ticket 27251.
3174 o Testing (continuous integration):
3175 - In Travis, make stem log a controller trace to the console, and tail
3176 stem's tor log after failure. Closes ticket 30591.
3177 - In Travis, only run the stem tests that use a tor binary.
3178 Closes ticket 30694.
3181 Changes in version 0.4.0.5 - 2019-05-02
3182 This is the first stable release in the 0.4.0.x series. It contains
3183 improvements for power management and bootstrap reporting, as well as
3184 preliminary backend support for circuit padding to prevent some kinds
3185 of traffic analysis. It also continues our work in refactoring Tor for
3186 long-term maintainability.
3188 Per our support policy, we will support the 0.4.0.x series for nine
3189 months, or until three months after the release of a stable 0.4.1.x:
3190 whichever is longer. If you need longer-term support, please stick
3191 with 0.3.5.x, which will we plan to support until Feb 2022.
3193 Below are the changes since 0.3.5.7. For a complete list of changes
3194 since 0.4.0.4-rc, see the ChangeLog file.
3196 o Major features (battery management, client, dormant mode):
3197 - When Tor is running as a client, and it is unused for a long time,
3198 it can now enter a "dormant" state. When Tor is dormant, it avoids
3199 network and CPU activity until it is reawoken either by a user
3200 request or by a controller command. For more information, see the
3201 configuration options starting with "Dormant". Implements tickets
3203 - The client's memory of whether it is "dormant", and how long it
3204 has spent idle, persists across invocations. Implements
3206 - There is a DormantOnFirstStartup option that integrators can use
3207 if they expect that in many cases, Tor will be installed but
3210 o Major features (bootstrap reporting):
3211 - When reporting bootstrap progress, report the first connection
3212 uniformly, regardless of whether it's a connection for building
3213 application circuits. This allows finer-grained reporting of early
3214 progress than previously possible, with the improvements of ticket
3215 27169. Closes tickets 27167 and 27103. Addresses ticket 27308.
3216 - When reporting bootstrap progress, treat connecting to a proxy or
3217 pluggable transport as separate from having successfully used that
3218 proxy or pluggable transport to connect to a relay. Closes tickets
3221 o Major features (circuit padding):
3222 - Implement preliminary support for the circuit padding portion of
3223 Proposal 254. The implementation supports Adaptive Padding (aka
3224 WTF-PAD) state machines for use between experimental clients and
3225 relays. Support is also provided for APE-style state machines that
3226 use probability distributions instead of histograms to specify
3227 inter-packet delay. At the moment, Tor does not provide any
3228 padding state machines that are used in normal operation: for now,
3229 this feature exists solely for experimentation. Closes
3232 o Major features (refactoring):
3233 - Tor now uses an explicit list of its own subsystems when
3234 initializing and shutting down. Previously, these systems were
3235 managed implicitly in various places throughout the codebase.
3236 (There may still be some subsystems using the old system.) Closes
3239 o Major bugfixes (cell scheduler, KIST, security):
3240 - Make KIST consider the outbuf length when computing what it can
3241 put in the outbuf. Previously, KIST acted as though the outbuf
3242 were empty, which could lead to the outbuf becoming too full. It
3243 is possible that an attacker could exploit this bug to cause a Tor
3244 client or relay to run out of memory and crash. Fixes bug 29168;
3245 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
3246 TROVE-2019-001 and CVE-2019-8955.
3248 o Major bugfixes (networking):
3249 - Gracefully handle empty username/password fields in SOCKS5
3250 username/password auth message and allow SOCKS5 handshake to
3251 continue. Previously, we had rejected these handshakes, breaking
3252 certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
3254 o Major bugfixes (NSS, relay):
3255 - When running with NSS, disable TLS 1.2 ciphersuites that use
3256 SHA384 for their PRF. Due to an NSS bug, the TLS key exporters for
3257 these ciphersuites don't work -- which caused relays to fail to
3258 handshake with one another when these ciphersuites were enabled.
3259 Fixes bug 29241; bugfix on 0.3.5.1-alpha.
3261 o Major bugfixes (windows, startup):
3262 - When reading a consensus file from disk, detect whether it was
3263 written in text mode, and re-read it in text mode if so. Always
3264 write consensus files in binary mode so that we can map them into
3265 memory later. Previously, we had written in text mode, which
3266 confused us when we tried to map the file on windows. Fixes bug
3267 28614; bugfix on 0.4.0.1-alpha.
3269 o Minor features (address selection):
3270 - Treat the subnet 100.64.0.0/10 as public for some purposes;
3271 private for others. This subnet is the RFC 6598 (Carrier Grade
3272 NAT) IP range, and is deployed by many ISPs as an alternative to
3273 RFC 1918 that does not break existing internal networks. Tor now
3274 blocks SOCKS and control ports on these addresses and warns users
3275 if client ports or ExtORPorts are listening on a RFC 6598 address.
3276 Closes ticket 28525. Patch by Neel Chauhan.
3278 o Minor features (bandwidth authority):
3279 - Make bandwidth authorities ignore relays that are reported in the
3280 bandwidth file with the flag "vote=0". This change allows us to
3281 report unmeasured relays for diagnostic reasons without including
3282 their bandwidth in the bandwidth authorities' vote. Closes
3284 - When a directory authority is using a bandwidth file to obtain the
3285 bandwidth values that will be included in the next vote, serve
3286 this bandwidth file at /tor/status-vote/next/bandwidth. Closes
3289 o Minor features (bootstrap reporting):
3290 - When reporting bootstrap progress, stop distinguishing between
3291 situations where only internal paths are available and situations
3292 where external paths are available. Previously, Tor would often
3293 erroneously report that it had only internal paths. Closes
3296 o Minor features (compilation):
3297 - Compile correctly when OpenSSL is built with engine support
3298 disabled, or with deprecated APIs disabled. Closes ticket 29026.
3299 Patches from "Mangix".
3301 o Minor features (continuous integration):
3302 - On Travis Rust builds, cleanup Rust registry and refrain from
3303 caching the "target/" directory to speed up builds. Resolves
3305 - Log Python version during each Travis CI job. Resolves
3307 - In Travis, tell timelimit to use stem's backtrace signals, and
3308 launch python directly from timelimit, so python receives the
3309 signals from timelimit, rather than make. Closes ticket 30117.
3311 o Minor features (controller):
3312 - Add a DROPOWNERSHIP command to undo the effects of TAKEOWNERSHIP.
3313 Implements ticket 28843.
3315 o Minor features (developer tooling):
3316 - Check that bugfix versions in changes files look like Tor versions
3317 from the versions spec. Warn when bugfixes claim to be on a future
3318 release. Closes ticket 27761.
3319 - Provide a git pre-commit hook that disallows committing if we have
3320 any failures in our code and changelog formatting checks. It is
3321 now available in scripts/maint/pre-commit.git-hook. Implements
3323 - Provide a git hook script to prevent "fixup!" and "squash!"
3324 commits from ending up in the master branch, as scripts/main/pre-
3325 push.git-hook. Closes ticket 27993.
3327 o Minor features (diagnostic):
3328 - Add more diagnostic log messages in an attempt to solve the issue
3329 of NUL bytes appearing in a microdescriptor cache. Related to
3332 o Minor features (directory authority):
3333 - When a directory authority is using a bandwidth file to obtain
3334 bandwidth values, include the digest of that file in the vote.
3335 Closes ticket 26698.
3336 - Directory authorities support a new consensus algorithm, under
3337 which the family lines in microdescriptors are encoded in a
3338 canonical form. This change makes family lines more compressible
3339 in transit, and on the client. Closes ticket 28266; implements
3342 o Minor features (directory authority, relay):
3343 - Authorities now vote on a "StaleDesc" flag to indicate that a
3344 relay's descriptor is so old that the relay should upload again
3345 soon. Relays treat this flag as a signal to upload a new
3346 descriptor. This flag will eventually let us remove the
3347 'published' date from routerstatus entries, and make our consensus
3348 diffs much smaller. Closes ticket 26770; implements proposal 293.
3350 o Minor features (dormant mode):
3351 - Add a DormantCanceledByStartup option to tell Tor that it should
3352 treat a startup event as cancelling any previous dormant state.
3353 Integrators should use this option with caution: it should only be
3354 used if Tor is being started because of something that the user
3355 did, and not if Tor is being automatically started in the
3356 background. Closes ticket 29357.
3358 o Minor features (fallback directory mirrors):
3359 - Update the fallback whitelist based on operator opt-ins and opt-
3360 outs. Closes ticket 24805, patch by Phoul.
3362 o Minor features (FreeBSD):
3363 - On FreeBSD-based systems, warn relay operators if the
3364 "net.inet.ip.random_id" sysctl (IP ID randomization) is disabled.
3365 Closes ticket 28518.
3367 o Minor features (geoip):
3368 - Update geoip and geoip6 to the April 2 2019 Maxmind GeoLite2
3369 Country database. Closes ticket 29992.
3371 o Minor features (HTTP standards compliance):
3372 - Stop sending the header "Content-type: application/octet-stream"
3373 along with transparently compressed documents: this confused
3374 browsers. Closes ticket 28100.
3376 o Minor features (IPv6):
3377 - We add an option ClientAutoIPv6ORPort, to make clients randomly
3378 prefer a node's IPv4 or IPv6 ORPort. The random preference is set
3379 every time a node is loaded from a new consensus or bridge config.
3380 We expect that this option will enable clients to bootstrap more
3381 quickly without having to determine whether they support IPv4,
3382 IPv6, or both. Closes ticket 27490. Patch by Neel Chauhan.
3383 - When using addrs_in_same_network_family(), avoid choosing circuit
3384 paths that pass through the same IPv6 subnet more than once.
3385 Previously, we only checked IPv4 subnets. Closes ticket 24393.
3386 Patch by Neel Chauhan.
3388 o Minor features (log messages):
3389 - Improve log message in v3 onion services that could print out
3390 negative revision counters. Closes ticket 27707. Patch
3393 o Minor features (memory usage):
3394 - Save memory by storing microdescriptor family lists with a more
3395 compact representation. Closes ticket 27359.
3396 - Tor clients now use mmap() to read consensus files from disk, so
3397 that they no longer need keep the full text of a consensus in
3398 memory when parsing it or applying a diff. Closes ticket 27244.
3400 o Minor features (NSS, diagnostic):
3401 - Try to log an error from NSS (if there is any) and a more useful
3402 description of our situation if we are using NSS and a call to
3403 SSL_ExportKeyingMaterial() fails. Diagnostic for ticket 29241.
3405 o Minor features (parsing):
3406 - Directory authorities now validate that router descriptors and
3407 ExtraInfo documents are in a valid subset of UTF-8, and reject
3408 them if they are not. Closes ticket 27367.
3410 o Minor features (performance):
3411 - Cache the results of summarize_protocol_flags(), so that we don't
3412 have to parse the same protocol-versions string over and over.
3413 This should save us a huge number of malloc calls on startup, and
3414 may reduce memory fragmentation with some allocators. Closes
3416 - Remove a needless memset() call from get_token_arguments, thereby
3417 speeding up the tokenization of directory objects by about 20%.
3418 Closes ticket 28852.
3419 - Replace parse_short_policy() with a faster implementation, to
3420 improve microdescriptor parsing time. Closes ticket 28853.
3421 - Speed up directory parsing a little by avoiding use of the non-
3422 inlined strcmp_len() function. Closes ticket 28856.
3423 - Speed up microdescriptor parsing by about 30%, to help improve
3424 startup time. Closes ticket 28839.
3426 o Minor features (pluggable transports):
3427 - Add support for emitting STATUS updates to Tor's control port from
3428 a pluggable transport process. Closes ticket 28846.
3429 - Add support for logging to Tor's logging subsystem from a
3430 pluggable transport process. Closes ticket 28180.
3432 o Minor features (process management):
3433 - Add a new process API for handling child processes. This new API
3434 allows Tor to have bi-directional communication with child
3435 processes on both Unix and Windows. Closes ticket 28179.
3436 - Use the subsystem manager to initialize and shut down the process
3437 module. Closes ticket 28847.
3439 o Minor features (relay):
3440 - When listing relay families, list them in canonical form including
3441 the relay's own identity, and try to give a more useful set of
3442 warnings. Part of ticket 28266 and proposal 298.
3444 o Minor features (required protocols):
3445 - Before exiting because of a missing required protocol, Tor will
3446 now check the publication time of the consensus, and not exit
3447 unless the consensus is newer than the Tor program's own release
3448 date. Previously, Tor would not check the consensus publication
3449 time, and so might exit because of a missing protocol that might
3450 no longer be required in a current consensus. Implements proposal
3451 297; closes ticket 27735.
3453 o Minor features (testing):
3454 - Treat all unexpected ERR and BUG messages as test failures. Closes
3456 - Allow a HeartbeatPeriod of less than 30 minutes in testing Tor
3457 networks. Closes ticket 28840. Patch by Rob Jansen.
3458 - Use the approx_time() function when setting the "Expires" header
3459 in directory replies, to make them more testable. Needed for
3462 o Minor bugfixes (security):
3463 - Fix a potential double free bug when reading huge bandwidth files.
3464 The issue is not exploitable in the current Tor network because
3465 the vulnerable code is only reached when directory authorities
3466 read bandwidth files, but bandwidth files come from a trusted
3467 source (usually the authorities themselves). Furthermore, the
3468 issue is only exploitable in rare (non-POSIX) 32-bit architectures,
3469 which are not used by any of the current authorities. Fixes bug
3470 30040; bugfix on 0.3.5.1-alpha. Bug found and fixed by
3472 - Verify in more places that we are not about to create a buffer
3473 with more than INT_MAX bytes, to avoid possible OOB access in the
3474 event of bugs. Fixes bug 30041; bugfix on 0.2.0.16. Found and
3475 fixed by Tobias Stoeckmann.
3477 o Minor bugfix (continuous integration):
3478 - Reset coverage state on disk after Travis CI has finished. This
3479 should prevent future coverage merge errors from causing the test
3480 suite for the "process" subsystem to fail. The process subsystem
3481 was introduced in 0.4.0.1-alpha. Fixes bug 29036; bugfix
3483 - Terminate test-stem if it takes more than 9.5 minutes to run.
3484 (Travis terminates the job after 10 minutes of no output.)
3485 Diagnostic for 29437. Fixes bug 30011; bugfix on 0.3.5.4-alpha.
3487 o Minor bugfixes (build, compatibility, rust):
3488 - Update Cargo.lock file to match the version made by the latest
3489 version of Rust, so that "make distcheck" will pass again. Fixes
3490 bug 29244; bugfix on 0.3.3.4-alpha.
3492 o Minor bugfixes (C correctness):
3493 - Fix an unlikely memory leak in consensus_diff_apply(). Fixes bug
3494 29824; bugfix on 0.3.1.1-alpha. This is Coverity warning
3497 o Minor bugfixes (client, clock skew):
3498 - Bootstrap successfully even when Tor's clock is behind the clocks
3499 on the authorities. Fixes bug 28591; bugfix on 0.2.0.9-alpha.
3500 - Select guards even if the consensus has expired, as long as the
3501 consensus is still reasonably live. Fixes bug 24661; bugfix
3504 o Minor bugfixes (compilation):
3505 - Fix compilation warnings in test_circuitpadding.c. Fixes bug
3506 29169; bugfix on 0.4.0.1-alpha.
3507 - Silence a compiler warning in test-memwipe.c on OpenBSD. Fixes bug
3508 29145; bugfix on 0.2.9.3-alpha. Patch from Kris Katterjohn.
3509 - Compile correctly on OpenBSD; previously, we were missing some
3510 headers required in order to detect it properly. Fixes bug 28938;
3511 bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
3513 o Minor bugfixes (directory clients):
3514 - Mark outdated dirservers when Tor only has a reasonably live
3515 consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
3517 o Minor bugfixes (directory mirrors):
3518 - Even when a directory mirror's clock is behind the clocks on the
3519 authorities, we now allow the mirror to serve "future"
3520 consensuses. Fixes bug 28654; bugfix on 0.3.0.1-alpha.
3522 o Minor bugfixes (DNS):
3523 - Gracefully handle an empty or absent resolve.conf file by falling
3524 back to using "localhost" as a DNS server (and hoping it works).
3525 Previously, we would just stop running as an exit. Fixes bug
3526 21900; bugfix on 0.2.1.10-alpha.
3528 o Minor bugfixes (documentation):
3529 - Describe the contents of the v3 onion service client authorization
3530 files correctly: They hold public keys, not private keys. Fixes
3531 bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
3533 o Minor bugfixes (guards):
3534 - In count_acceptable_nodes(), the minimum number is now one bridge
3535 or guard node, and two non-guard nodes for a circuit. Previously,
3536 we had added up the sum of all nodes with a descriptor, but that
3537 could cause us to build failing circuits when we had either too
3538 many bridges or not enough guard nodes. Fixes bug 25885; bugfix on
3539 0.2.3.1-alpha. Patch by Neel Chauhan.
3541 o Minor bugfixes (IPv6):
3542 - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
3543 IPv6 socket was bound using an address family of AF_INET instead
3544 of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
3547 o Minor bugfixes (linux seccomp sandbox):
3548 - Fix startup crash when experimental sandbox support is enabled.
3549 Fixes bug 29150; bugfix on 0.4.0.1-alpha. Patch by Peter Gerber.
3551 o Minor bugfixes (logging):
3552 - Correct a misleading error message when IPv4Only or IPv6Only is
3553 used but the resolved address can not be interpreted as an address
3554 of the specified IP version. Fixes bug 13221; bugfix on
3555 0.2.3.9-alpha. Patch from Kris Katterjohn.
3556 - Log the correct port number for listening sockets when "auto" is
3557 used to let Tor pick the port number. Previously, port 0 was
3558 logged instead of the actual port number. Fixes bug 29144; bugfix
3559 on 0.3.5.1-alpha. Patch from Kris Katterjohn.
3560 - Stop logging a BUG() warning when Tor is waiting for exit
3561 descriptors. Fixes bug 28656; bugfix on 0.3.5.1-alpha.
3562 - Avoid logging that we are relaxing a circuit timeout when that
3563 timeout is fixed. Fixes bug 28698; bugfix on 0.2.4.7-alpha.
3564 - Log more information at "warning" level when unable to read a
3565 private key; log more information at "info" level when unable to
3566 read a public key. We had warnings here before, but they were lost
3567 during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
3568 - Rework rep_hist_log_link_protocol_counts() to iterate through all
3569 link protocol versions when logging incoming/outgoing connection
3570 counts. Tor no longer skips version 5, and we won't have to
3571 remember to update this function when new link protocol version is
3572 developed. Fixes bug 28920; bugfix on 0.2.6.10.
3574 o Minor bugfixes (memory management):
3575 - Refactor the shared random state's memory management so that it
3576 actually takes ownership of the shared random value pointers.
3577 Fixes bug 29706; bugfix on 0.2.9.1-alpha.
3578 - Stop leaking parts of the shared random state in the shared-random
3579 unit tests. Fixes bug 29599; bugfix on 0.2.9.1-alpha.
3581 o Minor bugfixes (misc):
3582 - The amount of total available physical memory is now determined
3583 using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
3584 when it is defined and a 64-bit variant is not available. Fixes
3585 bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
3587 o Minor bugfixes (networking):
3588 - Introduce additional checks into tor_addr_parse() to reject
3589 certain incorrect inputs that previously were not detected. Fixes
3590 bug 23082; bugfix on 0.2.0.10-alpha.
3592 o Minor bugfixes (onion service v3, client):
3593 - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
3594 connection waiting for a descriptor that we actually have in the
3595 cache. It turns out that this can actually happen, though it is
3596 rare. Now, tor will recover and retry the descriptor. Fixes bug
3597 28669; bugfix on 0.3.2.4-alpha.
3599 o Minor bugfixes (onion services):
3600 - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
3601 than one private key for a hidden service. Fixes bug 29040; bugfix
3603 - In hs_cache_store_as_client() log an HSDesc we failed to parse at
3604 "debug" level. Tor used to log it as a warning, which caused very
3605 long log lines to appear for some users. Fixes bug 29135; bugfix
3607 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
3608 as a warning. Instead, log it as a protocol warning, because there
3609 is nothing that relay operators can do to fix it. Fixes bug 29029;
3610 bugfix on 0.2.5.7-rc.
3612 o Minor bugfixes (periodic events):
3613 - Refrain from calling routerlist_remove_old_routers() from
3614 check_descriptor_callback(). Instead, create a new hourly periodic
3615 event. Fixes bug 27929; bugfix on 0.2.8.1-alpha.
3617 o Minor bugfixes (pluggable transports):
3618 - Make sure that data is continously read from standard output and
3619 standard error pipes of a pluggable transport child-process, to
3620 avoid deadlocking when a pipe's buffer is full. Fixes bug 26360;
3621 bugfix on 0.2.3.6-alpha.
3623 o Minor bugfixes (rust):
3624 - Abort on panic in all build profiles, instead of potentially
3625 unwinding into C code. Fixes bug 27199; bugfix on 0.3.3.1-alpha.
3627 o Minor bugfixes (scheduler):
3628 - When re-adding channels to the pending list, check the correct
3629 channel's sched_heap_idx. This issue has had no effect in mainline
3630 Tor, but could have led to bugs down the road in improved versions
3631 of our circuit scheduling code. Fixes bug 29508; bugfix
3634 o Minor bugfixes (shellcheck):
3635 - Look for scripts in their correct locations during "make
3636 shellcheck". Previously we had looked in the wrong place during
3637 out-of-tree builds. Fixes bug 30263; bugfix on 0.4.0.1-alpha.
3639 o Minor bugfixes (single onion services):
3640 - Allow connections to single onion services to remain idle without
3641 being disconnected. Previously, relays acting as rendezvous points
3642 for single onion services were mistakenly closing idle rendezvous
3643 circuits after 60 seconds, thinking that they were unused
3644 directory-fetching circuits that had served their purpose. Fixes
3645 bug 29665; bugfix on 0.2.1.26.
3647 o Minor bugfixes (stats):
3648 - When ExtraInfoStatistics is 0, stop including PaddingStatistics in
3649 relay and bridge extra-info documents. Fixes bug 29017; bugfix
3652 o Minor bugfixes (testing):
3653 - Backport the 0.3.4 src/test/test-network.sh to 0.2.9. We need a
3654 recent test-network.sh to use new chutney features in CI. Fixes
3655 bug 29703; bugfix on 0.2.9.1-alpha.
3656 - Fix a test failure on Windows caused by an unexpected "BUG"
3657 warning in our tests for tor_gmtime_r(-1). Fixes bug 29922; bugfix
3659 - Downgrade some LOG_ERR messages in the address/* tests to
3660 warnings. The LOG_ERR messages were occurring when we had no
3661 configured network. We were failing the unit tests, because we
3662 backported 28668 to 0.3.5.8, but did not backport 29530. Fixes bug
3663 29530; bugfix on 0.3.5.8.
3664 - Fix our gcov wrapper script to look for object files at the
3665 correct locations. Fixes bug 29435; bugfix on 0.3.5.1-alpha.
3666 - Decrease the false positive rate of stochastic probability
3667 distribution tests. Fixes bug 29693; bugfix on 0.4.0.1-alpha.
3668 - Fix intermittent failures on an adaptive padding test. Fixes one
3669 case of bug 29122; bugfix on 0.4.0.1-alpha.
3670 - Disable an unstable circuit-padding test that was failing
3671 intermittently because of an ill-defined small histogram. Such
3672 histograms will be allowed again after 29298 is implemented. Fixes
3673 a second case of bug 29122; bugfix on 0.4.0.1-alpha.
3674 - Detect and suppress "bug" warnings from the util/time test on
3675 Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
3676 - Do not log an error-level message if we fail to find an IPv6
3677 network interface from the unit tests. Fixes bug 29160; bugfix
3679 - Instead of relying on hs_free_all() to clean up all onion service
3680 objects in test_build_descriptors(), we now deallocate them one by
3681 one. This lets Coverity know that we are not leaking memory there
3682 and fixes CID 1442277. Fixes bug 28989; bugfix on 0.3.5.1-alpha.
3683 - Check the time in the "Expires" header using approx_time(). Fixes
3684 bug 30001; bugfix on 0.4.0.4-rc.
3686 o Minor bugfixes (TLS protocol):
3687 - When classifying a client's selection of TLS ciphers, if the
3688 client ciphers are not yet available, do not cache the result.
3689 Previously, we had cached the unavailability of the cipher list
3690 and never looked again, which in turn led us to assume that the
3691 client only supported the ancient V1 link protocol. This, in turn,
3692 was causing Stem integration tests to stall in some cases. Fixes
3693 bug 30021; bugfix on 0.2.4.8-alpha.
3695 o Minor bugfixes (UI):
3696 - Lower log level of unlink() errors during bootstrap. Fixes bug
3697 29930; bugfix on 0.4.0.1-alpha.
3699 o Minor bugfixes (usability):
3700 - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
3701 Some users took this phrasing to mean that the mentioned guard was
3702 under their control or responsibility, which it is not. Fixes bug
3703 28895; bugfix on Tor 0.3.0.1-alpha.
3705 o Minor bugfixes (Windows, CI):
3706 - Skip the Appveyor 32-bit Windows Server 2016 job, and 64-bit
3707 Windows Server 2012 R2 job. The remaining 2 jobs still provide
3708 coverage of 64/32-bit, and Windows Server 2016/2012 R2. Also set
3709 fast_finish, so failed jobs terminate the build immediately. Fixes
3710 bug 29601; bugfix on 0.3.5.4-alpha.
3712 o Code simplification and refactoring:
3713 - Introduce a connection_dir_buf_add() helper function that detects
3714 whether compression is in use, and adds a string accordingly.
3715 Resolves issue 28816.
3716 - Refactor handle_get_next_bandwidth() to use
3717 connection_dir_buf_add(). Implements ticket 29897.
3718 - Reimplement NETINFO cell parsing and generation to rely on
3719 trunnel-generated wire format handling code. Closes ticket 27325.
3720 - Remove unnecessary unsafe code from the Rust macro "cstr!". Closes
3722 - Rework SOCKS wire format handling to rely on trunnel-generated
3723 parsing/generation code. Resolves ticket 27620.
3724 - Split out bootstrap progress reporting from control.c into a
3725 separate file. Part of ticket 27402.
3726 - The .may_include files that we use to describe our directory-by-
3727 directory dependency structure now describe a noncircular
3728 dependency graph over the directories that they cover. Our
3729 checkIncludes.py tool now enforces this noncircularity. Closes
3733 - Clarify that Tor performs stream isolation among *Port listeners
3734 by default. Resolves issue 29121.
3735 - In the manpage entry describing MapAddress torrc setting, use
3736 example IP addresses from ranges specified for use in documentation
3737 by RFC 5737. Resolves issue 28623.
3738 - Mention that you cannot add a new onion service if Tor is already
3739 running with Sandbox enabled. Closes ticket 28560.
3740 - Improve ControlPort documentation. Mention that it accepts
3741 address:port pairs, and can be used multiple times. Closes
3743 - Document the exact output of "tor --version". Closes ticket 28889.
3746 - Remove the old check-tor script. Resolves issue 29072.
3747 - Stop responding to the 'GETINFO status/version/num-concurring' and
3748 'GETINFO status/version/num-versioning' control port commands, as
3749 those were deprecated back in 0.2.0.30. Also stop listing them in
3750 output of 'GETINFO info/names'. Resolves ticket 28757.
3751 - The scripts used to generate and maintain the list of fallback
3752 directories have been extracted into a new "fallback-scripts"
3753 repository. Closes ticket 27914.
3756 - Run shellcheck for scripts in the in scripts/ directory. Closes
3758 - Add unit tests for tokenize_string() and get_next_token()
3759 functions. Resolves ticket 27625.
3761 o Code simplification and refactoring (onion service v3):
3762 - Consolidate the authorized client descriptor cookie computation
3763 code from client and service into one function. Closes
3766 o Code simplification and refactoring (shell scripts):
3767 - Cleanup scan-build.sh to silence shellcheck warnings. Closes
3769 - Fix issues that shellcheck found in chutney-git-bisect.sh.
3770 Resolves ticket 28006.
3771 - Fix issues that shellcheck found in updateRustDependencies.sh.
3772 Resolves ticket 28012.
3773 - Fix shellcheck warnings in cov-diff script. Resolves issue 28009.
3774 - Fix shellcheck warnings in run_calltool.sh. Resolves ticket 28011.
3775 - Fix shellcheck warnings in run_trunnel.sh. Resolves issue 28010.
3776 - Fix shellcheck warnings in scripts/test/coverage. Resolves
3780 Changes in version 0.3.5.8 - 2019-02-21
3781 Tor 0.3.5.8 backports several fixes from later releases, including fixes
3782 for an annoying SOCKS-parsing bug that affected users in earlier 0.3.5.x
3785 It also includes a fix for a medium-severity security bug affecting Tor
3786 0.3.2.1-alpha and later. All Tor instances running an affected release
3787 should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
3789 o Major bugfixes (cell scheduler, KIST, security):
3790 - Make KIST consider the outbuf length when computing what it can
3791 put in the outbuf. Previously, KIST acted as though the outbuf
3792 were empty, which could lead to the outbuf becoming too full. It
3793 is possible that an attacker could exploit this bug to cause a Tor
3794 client or relay to run out of memory and crash. Fixes bug 29168;
3795 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
3796 TROVE-2019-001 and CVE-2019-8955.
3798 o Major bugfixes (networking, backport from 0.4.0.2-alpha):
3799 - Gracefully handle empty username/password fields in SOCKS5
3800 username/password auth messsage and allow SOCKS5 handshake to
3801 continue. Previously, we had rejected these handshakes, breaking
3802 certain applications. Fixes bug 29175; bugfix on 0.3.5.1-alpha.
3804 o Minor features (compilation, backport from 0.4.0.2-alpha):
3805 - Compile correctly when OpenSSL is built with engine support
3806 disabled, or with deprecated APIs disabled. Closes ticket 29026.
3807 Patches from "Mangix".
3809 o Minor features (geoip):
3810 - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
3811 Country database. Closes ticket 29478.
3813 o Minor features (testing, backport from 0.4.0.2-alpha):
3814 - Treat all unexpected ERR and BUG messages as test failures. Closes
3817 o Minor bugfixes (onion service v3, client, backport from 0.4.0.1-alpha):
3818 - Stop logging a "BUG()" warning and stacktrace when we find a SOCKS
3819 connection waiting for a descriptor that we actually have in the
3820 cache. It turns out that this can actually happen, though it is
3821 rare. Now, tor will recover and retry the descriptor. Fixes bug
3822 28669; bugfix on 0.3.2.4-alpha.
3824 o Minor bugfixes (IPv6, backport from 0.4.0.1-alpha):
3825 - Fix tor_ersatz_socketpair on IPv6-only systems. Previously, the
3826 IPv6 socket was bound using an address family of AF_INET instead
3827 of AF_INET6. Fixes bug 28995; bugfix on 0.3.5.1-alpha. Patch from
3830 o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
3831 - Update Cargo.lock file to match the version made by the latest
3832 version of Rust, so that "make distcheck" will pass again. Fixes
3833 bug 29244; bugfix on 0.3.3.4-alpha.
3835 o Minor bugfixes (client, clock skew, backport from 0.4.0.1-alpha):
3836 - Select guards even if the consensus has expired, as long as the
3837 consensus is still reasonably live. Fixes bug 24661; bugfix
3840 o Minor bugfixes (compilation, backport from 0.4.0.1-alpha):
3841 - Compile correctly on OpenBSD; previously, we were missing some
3842 headers required in order to detect it properly. Fixes bug 28938;
3843 bugfix on 0.3.5.1-alpha. Patch from Kris Katterjohn.
3845 o Minor bugfixes (documentation, backport from 0.4.0.2-alpha):
3846 - Describe the contents of the v3 onion service client authorization
3847 files correctly: They hold public keys, not private keys. Fixes
3848 bug 28979; bugfix on 0.3.5.1-alpha. Spotted by "Felixix".
3850 o Minor bugfixes (logging, backport from 0.4.0.1-alpha):
3851 - Rework rep_hist_log_link_protocol_counts() to iterate through all
3852 link protocol versions when logging incoming/outgoing connection
3853 counts. Tor no longer skips version 5, and we won't have to
3854 remember to update this function when new link protocol version is
3855 developed. Fixes bug 28920; bugfix on 0.2.6.10.
3857 o Minor bugfixes (logging, backport from 0.4.0.2-alpha):
3858 - Log more information at "warning" level when unable to read a
3859 private key; log more information at "info" level when unable to
3860 read a public key. We had warnings here before, but they were lost
3861 during our NSS work. Fixes bug 29042; bugfix on 0.3.5.1-alpha.
3863 o Minor bugfixes (misc, backport from 0.4.0.2-alpha):
3864 - The amount of total available physical memory is now determined
3865 using the sysctl identifier HW_PHYSMEM (rather than HW_USERMEM)
3866 when it is defined and a 64-bit variant is not available. Fixes
3867 bug 28981; bugfix on 0.2.5.4-alpha. Patch from Kris Katterjohn.
3869 o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
3870 - Avoid crashing if ClientOnionAuthDir (incorrectly) contains more
3871 than one private key for a hidden service. Fixes bug 29040; bugfix
3873 - In hs_cache_store_as_client() log an HSDesc we failed to parse at
3874 "debug" level. Tor used to log it as a warning, which caused very
3875 long log lines to appear for some users. Fixes bug 29135; bugfix
3877 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
3878 as a warning. Instead, log it as a protocol warning, because there
3879 is nothing that relay operators can do to fix it. Fixes bug 29029;
3880 bugfix on 0.2.5.7-rc.
3882 o Minor bugfixes (tests, directory clients, backport from 0.4.0.1-alpha):
3883 - Mark outdated dirservers when Tor only has a reasonably live
3884 consensus. Fixes bug 28569; bugfix on 0.3.2.5-alpha.
3886 o Minor bugfixes (tests, backport from 0.4.0.2-alpha):
3887 - Detect and suppress "bug" warnings from the util/time test on
3888 Windows. Fixes bug 29161; bugfix on 0.2.9.3-alpha.
3889 - Do not log an error-level message if we fail to find an IPv6
3890 network interface from the unit tests. Fixes bug 29160; bugfix
3893 o Minor bugfixes (usability, backport from 0.4.0.1-alpha):
3894 - Stop saying "Your Guard ..." in pathbias_measure_{use,close}_rate().
3895 Some users took this phrasing to mean that the mentioned guard was
3896 under their control or responsibility, which it is not. Fixes bug
3897 28895; bugfix on Tor 0.3.0.1-alpha.
3900 Changes in version 0.3.4.11 - 2019-02-21
3901 Tor 0.3.4.11 is the third stable release in its series. It includes
3902 a fix for a medium-severity security bug affecting Tor 0.3.2.1-alpha and
3903 later. All Tor instances running an affected release should upgrade to
3904 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
3906 o Major bugfixes (cell scheduler, KIST, security):
3907 - Make KIST consider the outbuf length when computing what it can
3908 put in the outbuf. Previously, KIST acted as though the outbuf
3909 were empty, which could lead to the outbuf becoming too full. It
3910 is possible that an attacker could exploit this bug to cause a Tor
3911 client or relay to run out of memory and crash. Fixes bug 29168;
3912 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
3913 TROVE-2019-001 and CVE-2019-8955.
3915 o Minor features (geoip):
3916 - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
3917 Country database. Closes ticket 29478.
3919 o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
3920 - Update Cargo.lock file to match the version made by the latest
3921 version of Rust, so that "make distcheck" will pass again. Fixes
3922 bug 29244; bugfix on 0.3.3.4-alpha.
3924 o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
3925 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
3926 as a warning. Instead, log it as a protocol warning, because there
3927 is nothing that relay operators can do to fix it. Fixes bug 29029;
3928 bugfix on 0.2.5.7-rc.
3931 Changes in version 0.3.3.12 - 2019-02-21
3932 Tor 0.3.3.12 fixes a medium-severity security bug affecting Tor
3933 0.3.2.1-alpha and later. All Tor instances running an affected release
3934 should upgrade to 0.3.3.12, 0.3.4.11, 0.3.5.8, or 0.4.0.2-alpha.
3936 This release marks the end of support for the Tor 0.3.3.x series. We
3937 recommend that users switch to either the Tor 0.3.4 series (supported
3938 until at least 10 June 2019), or the Tor 0.3.5 series, which will
3939 receive long-term support until at least 1 Feb 2022.
3941 o Major bugfixes (cell scheduler, KIST, security):
3942 - Make KIST consider the outbuf length when computing what it can
3943 put in the outbuf. Previously, KIST acted as though the outbuf
3944 were empty, which could lead to the outbuf becoming too full. It
3945 is possible that an attacker could exploit this bug to cause a Tor
3946 client or relay to run out of memory and crash. Fixes bug 29168;
3947 bugfix on 0.3.2.1-alpha. This issue is also being tracked as
3948 TROVE-2019-001 and CVE-2019-8955.
3950 o Minor features (geoip):
3951 - Update geoip and geoip6 to the February 5 2019 Maxmind GeoLite2
3952 Country database. Closes ticket 29478.
3954 o Minor bugfixes (build, compatibility, rust, backport from 0.4.0.2-alpha):
3955 - Update Cargo.lock file to match the version made by the latest
3956 version of Rust, so that "make distcheck" will pass again. Fixes
3957 bug 29244; bugfix on 0.3.3.4-alpha.
3959 o Minor bugfixes (onion services, backport from 0.4.0.2-alpha):
3960 - Stop logging "Tried to establish rendezvous on non-OR circuit..."
3961 as a warning. Instead, log it as a protocol warning, because there
3962 is nothing that relay operators can do to fix it. Fixes bug 29029;
3963 bugfix on 0.2.5.7-rc.
3966 Changes in version 0.3.3.11 - 2019-01-07
3967 Tor 0.3.3.11 backports numerous fixes from later versions of Tor.
3968 numerous fixes, including an important fix for anyone using OpenSSL
3969 1.1.1. Anyone running an earlier version of Tor 0.3.3 should upgrade
3970 to this version, or to a later series.
3972 As a reminder, support the Tor 0.3.3 series will end on 22 Feb 2019.
3973 We anticipate that this will be the last release of Tor 0.3.3, unless
3974 some major bug is before then. Some time between now and then, users
3975 should switch to either the Tor 0.3.4 series (supported until at least
3976 10 June 2019), or the Tor 0.3.5 series, which will receive long-term
3977 support until at least 1 Feb 2022.
3979 o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
3980 - Fix our usage of named groups when running as a TLS 1.3 client in
3981 OpenSSL 1.1.1. Previously, we only initialized EC groups when
3982 running as a relay, which caused clients to fail to negotiate TLS
3983 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
3986 o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
3987 - Fix a use-after-free error that could be caused by passing Tor an
3988 impossible set of options that would fail during options_act().
3989 Fixes bug 27708; bugfix on 0.3.3.1-alpha.
3991 o Minor features (continuous integration, backport from 0.3.5.1-alpha):
3992 - Only run one online rust build in Travis, to reduce network
3993 errors. Skip offline rust builds on Travis for Linux gcc, because
3994 they're redundant. Implements ticket 27252.
3995 - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
3996 duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
3997 Linux with default settings, because all the non-default builds
3998 use gcc on Linux. Implements ticket 27252.
4000 o Minor features (continuous integration, backport from 0.3.5.3-alpha):
4001 - Use the Travis Homebrew addon to install packages on macOS during
4002 Travis CI. The package list is the same, but the Homebrew addon
4003 does not do a `brew update` by default. Implements ticket 27738.
4005 o Minor features (fallback directory list, backport from 0.3.5.6-rc):
4006 - Replace the 150 fallbacks originally introduced in Tor
4007 0.3.3.1-alpha in January 2018 (of which ~115 were still
4008 functional), with a list of 157 fallbacks (92 new, 65 existing, 85
4009 removed) generated in December 2018. Closes ticket 24803.
4011 o Minor features (geoip):
4012 - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
4013 Country database. Closes ticket 29012.
4015 o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
4016 - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
4017 key export function from handling long labels. When this bug is
4018 detected, Tor will disable TLS 1.3. We recommend upgrading to a
4019 version of OpenSSL without this bug when it becomes available.
4020 Closes ticket 28973.
4022 o Minor bugfixes (relay statistics, backport from 0.3.5.7):
4023 - Update relay descriptor on bandwidth changes only when the uptime
4024 is smaller than 24h, in order to reduce the efficiency of guard
4025 discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
4027 o Minor bugfixes (C correctness, backport from 0.3.5.4-alpha):
4028 - Avoid undefined behavior in an end-of-string check when parsing
4029 the BEGIN line in a directory object. Fixes bug 28202; bugfix
4032 o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
4033 - Rewrite our assertion macros so that they no longer suppress the
4034 compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
4036 o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
4037 - Initialize a variable unconditionally in aes_new_cipher(), since
4038 some compilers cannot tell that we always initialize it before
4039 use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
4041 o Minor bugfixes (directory authority, backport from 0.3.5.4-alpha):
4042 - Log additional info when we get a relay that shares an ed25519 ID
4043 with a different relay, instead making a BUG() warning. Fixes bug
4044 27800; bugfix on 0.3.2.1-alpha.
4046 o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
4047 - When a user requests a group-readable DataDirectory, give it to
4048 them. Previously, when the DataDirectory and the CacheDirectory
4049 were the same, the default setting (0) for
4050 CacheDirectoryGroupReadable would override the setting for
4051 DataDirectoryGroupReadable. Fixes bug 26913; bugfix
4054 o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
4055 - When the onion service directory can't be created or has the wrong
4056 permissions, do not log a stack trace. Fixes bug 27335; bugfix
4059 o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
4060 - Close all SOCKS request (for the same .onion) if the newly fetched
4061 descriptor is unusable. Before that, we would close only the first
4062 one leaving the other hanging and let to time out by themselves.
4063 Fixes bug 27410; bugfix on 0.3.2.1-alpha.
4065 o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
4066 - Don't warn so loudly when Tor is unable to decode an onion
4067 descriptor. This can now happen as a normal use case if a client
4068 gets a descriptor with client authorization but the client is not
4069 authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
4071 o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
4072 - When deleting an ephemeral onion service (DEL_ONION), do not close
4073 any rendezvous circuits in order to let the existing client
4074 connections finish by themselves or closed by the application. The
4075 HS v2 is doing that already so now we have the same behavior for
4076 all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
4078 o Minor bugfixes (HTTP tunnel):
4079 - Fix a bug warning when closing an HTTP tunnel connection due to
4080 an HTTP request we couldn't handle. Fixes bug 26470; bugfix on
4083 o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
4084 - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
4085 bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
4087 o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
4088 - Ensure circuitmux queues are empty before scheduling or sending
4089 padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
4091 o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
4092 - Reject protocol names containing bytes other than alphanumeric
4093 characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
4096 o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
4097 - Compute protover votes correctly in the rust version of the
4098 protover code. Previously, the protover rewrite in 24031 allowed
4099 repeated votes from the same voter for the same protocol version
4100 to be counted multiple times in protover_compute_vote(). Fixes bug
4101 27649; bugfix on 0.3.3.5-rc.
4102 - Reject protover names that contain invalid characters. Fixes bug
4103 27687; bugfix on 0.3.3.1-alpha.
4105 o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
4106 - protover_all_supported() would attempt to allocate up to 16GB on
4107 some inputs, leading to a potential memory DoS. Fixes bug 27206;
4108 bugfix on 0.3.3.5-rc.
4110 o Minor bugfixes (rust, backport from 0.3.5.4-alpha):
4111 - Fix a potential null dereference in protover_all_supported(). Add
4112 a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
4113 - Return a string that can be safely freed by C code, not one
4114 created by the rust allocator, in protover_all_supported(). Fixes
4115 bug 27740; bugfix on 0.3.3.1-alpha.
4116 - Fix an API mismatch in the rust implementation of
4117 protover_compute_vote(). This bug could have caused crashes on any
4118 directory authorities running Tor with Rust (which we do not yet
4119 recommend). Fixes bug 27741; bugfix on 0.3.3.6.
4121 o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
4122 - If a unit test running in a subprocess exits abnormally or with a
4123 nonzero status code, treat the test as having failed, even if the
4124 test reported success. Without this fix, memory leaks don't cause
4125 the tests to fail, even with LeakSanitizer. Fixes bug 27658;
4126 bugfix on 0.2.2.4-alpha.
4128 o Minor bugfixes (testing, backport from 0.3.5.4-alpha):
4129 - Treat backtrace test failures as expected on BSD-derived systems
4130 (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
4131 (FreeBSD failures have been treated as expected since 18204 in
4132 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
4134 o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
4135 - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
4136 bugfix on 0.3.0.1-alpha.
4139 Changes in version 0.3.4.10 - 2019-01-07
4140 Tor 0.3.4.9 is the second stable release in its series; it backports
4141 numerous fixes, including an important fix for relays, and for anyone
4142 using OpenSSL 1.1.1. Anyone running an earlier version of Tor 0.3.4
4145 As a reminder, the Tor 0.3.4 series will be supported until 10 June
4146 2019. Some time between now and then, users should switch to the Tor
4147 0.3.5 series, which will receive long-term support until at least 1
4150 o Major bugfixes (OpenSSL, portability, backport from 0.3.5.5-alpha):
4151 - Fix our usage of named groups when running as a TLS 1.3 client in
4152 OpenSSL 1.1.1. Previously, we only initialized EC groups when
4153 running as a relay, which caused clients to fail to negotiate TLS
4154 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
4157 o Major bugfixes (relay, directory, backport from 0.3.5.7):
4158 - Always reactivate linked connections in the main loop so long as
4159 any linked connection has been active. Previously, connections
4160 serving directory information wouldn't get reactivated after the
4161 first chunk of data was sent (usually 32KB), which would prevent
4162 clients from bootstrapping. Fixes bug 28912; bugfix on
4163 0.3.4.1-alpha. Patch by "cypherpunks3".
4165 o Minor features (continuous integration, Windows, backport from 0.3.5.6-rc):
4166 - Always show the configure and test logs, and upload them as build
4167 artifacts, when building for Windows using Appveyor CI.
4170 o Minor features (controller, backport from 0.3.5.1-alpha):
4171 - For purposes of CIRC_BW-based dropped cell detection, track half-
4172 closed stream ids, and allow their ENDs, SENDMEs, DATA and path
4173 bias check cells to arrive without counting it as dropped until
4174 either the END arrives, or the windows are empty. Closes
4177 o Minor features (fallback directory list, backport from 0.3.5.6-rc):
4178 - Replace the 150 fallbacks originally introduced in Tor
4179 0.3.3.1-alpha in January 2018 (of which ~115 were still
4180 functional), with a list of 157 fallbacks (92 new, 65 existing, 85
4181 removed) generated in December 2018. Closes ticket 24803.
4183 o Minor features (geoip):
4184 - Update geoip and geoip6 to the November 6 2018 Maxmind GeoLite2
4185 Country database. Closes ticket 28395.
4187 o Minor features (OpenSSL bug workaround, backport from 0.3.5.7):
4188 - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
4189 key export function from handling long labels. When this bug is
4190 detected, Tor will disable TLS 1.3. We recommend upgrading to a
4191 version of OpenSSL without this bug when it becomes available.
4192 Closes ticket 28973.
4194 o Minor bugfixes (compilation, backport from 0.3.5.5-alpha):
4195 - Initialize a variable unconditionally in aes_new_cipher(), since
4196 some compilers cannot tell that we always initialize it before
4197 use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
4199 o Minor bugfixes (connection, relay, backport from 0.3.5.5-alpha):
4200 - Avoid a logging a BUG() stacktrace when closing connection held
4201 open because the write side is rate limited but not the read side.
4202 Now, the connection read side is simply shut down until Tor is
4203 able to flush the connection and close it. Fixes bug 27750; bugfix
4206 o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.5-alpha):
4207 - Manually configure the zstd compiler options, when building using
4208 mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
4209 not come with a pkg-config file. Fixes bug 28454; bugfix
4211 - Stop using an external OpenSSL install, and stop installing MSYS2
4212 packages, when building using mingw on Appveyor Windows CI. Fixes
4213 bug 28399; bugfix on 0.3.4.1-alpha.
4215 o Minor bugfixes (continuous integration, Windows, backport from 0.3.5.6-rc):
4216 - Explicitly specify the path to the OpenSSL library and do not
4217 download OpenSSL from Pacman, but instead use the library that is
4218 already provided by AppVeyor. Fixes bug 28574; bugfix on master.
4220 o Minor bugfixes (directory permissions, backport form 0.3.5.3-alpha):
4221 - When a user requests a group-readable DataDirectory, give it to
4222 them. Previously, when the DataDirectory and the CacheDirectory
4223 were the same, the default setting (0) for
4224 CacheDirectoryGroupReadable would override the setting for
4225 DataDirectoryGroupReadable. Fixes bug 26913; bugfix
4228 o Minor bugfixes (memory leaks, backport from 0.3.5.5-alpha):
4229 - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
4230 bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
4232 o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
4233 - Don't warn so loudly when Tor is unable to decode an onion
4234 descriptor. This can now happen as a normal use case if a client
4235 gets a descriptor with client authorization but the client is not
4236 authorized. Fixes bug 27550; bugfix on 0.3.5.1-alpha.
4238 o Minor bugfixes (onion service v3, backport from 0.3.5.6-rc):
4239 - When deleting an ephemeral onion service (DEL_ONION), do not close
4240 any rendezvous circuits in order to let the existing client
4241 connections finish by themselves or closed by the application. The
4242 HS v2 is doing that already so now we have the same behavior for
4243 all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
4245 o Minor bugfixes (relay statistics, backport from 0.3.5.7):
4246 - Update relay descriptor on bandwidth changes only when the uptime
4247 is smaller than 24h, in order to reduce the efficiency of guard
4248 discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
4250 o Minor bugfixes (unit tests, guard selection, backport from 0.3.5.6-rc):
4251 - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
4252 bugfix on 0.3.0.1-alpha.
4255 Changes in version 0.3.5.7 - 2019-01-07
4256 Tor 0.3.5.7 is the first stable release in its series; it includes
4257 compilation and portability fixes, and a fix for a severe problem
4258 affecting directory caches.
4260 The Tor 0.3.5 series includes several new features and performance
4261 improvements, including client authorization for v3 onion services,
4262 cleanups to bootstrap reporting, support for improved bandwidth-
4263 measurement tools, experimental support for NSS in place of OpenSSL,
4264 and much more. It also begins a full reorganization of Tor's code
4265 layout, for improved modularity and maintainability in the future.
4266 Finally, there is the usual set of performance improvements and
4267 bugfixes that we try to do in every release series.
4269 There are a couple of changes in the 0.3.5 that may affect
4270 compatibility. First, the default version for newly created onion
4271 services is now v3. Use the HiddenServiceVersion option if you want to
4272 override this. Second, some log messages related to bootstrapping have
4273 changed; if you use stem, you may need to update to the latest version
4274 so it will recognize them.
4276 We have designated 0.3.5 as a "long-term support" (LTS) series: we
4277 will continue to patch major bugs in typical configurations of 0.3.5
4278 until at least 1 Feb 2022. (We do not plan to provide long-term
4279 support for embedding, Rust support, NSS support, running a directory
4280 authority, or unsupported platforms. For these, you will need to stick
4281 with the latest stable release.)
4283 Below are the changes since 0.3.4.9. For a complete list of changes
4284 since 0.3.5.6-rc, see the ChangeLog file.
4286 o Major features (bootstrap):
4287 - Don't report directory progress until after a connection to a
4288 relay or bridge has succeeded. Previously, we'd report 80%
4289 progress based on cached directory information when we couldn't
4290 even connect to the network. Closes ticket 27169.
4292 o Major features (new code layout):
4293 - Nearly all of Tor's source code has been moved around into more
4294 logical places. The "common" directory is now divided into a set
4295 of libraries in "lib", and files in the "or" directory have been
4296 split into "core" (logic absolutely needed for onion routing),
4297 "feature" (independent modules in Tor), and "app" (to configure
4298 and invoke the rest of Tor). See doc/HACKING/CodeStructure.md for
4299 more information. Closes ticket 26481.
4301 This refactoring is not complete: although the libraries have been
4302 refactored to be acyclic, the main body of Tor is still too
4303 interconnected. We will attempt to improve this in the future.
4305 o Major features (onion services v3):
4306 - Implement onion service client authorization at the descriptor
4307 level: only authorized clients can decrypt a service's descriptor
4308 to find out how to contact it. A new torrc option was added to
4309 control this client side: ClientOnionAuthDir <path>. On the
4310 service side, if the "authorized_clients/" directory exists in the
4311 onion service directory path, client configurations are read from
4312 the files within. See the manpage for more details. Closes ticket
4313 27547. Patch done by Suphanat Chunhapanya (haxxpop).
4314 - Improve revision counter generation in next-gen onion services.
4315 Onion services can now scale by hosting multiple instances on
4316 different hosts without synchronization between them, which was
4317 previously impossible because descriptors would get rejected by
4318 HSDirs. Addresses ticket 25552.
4319 - Version 3 onion services can now use the per-service
4320 HiddenServiceExportCircuitID option to differentiate client
4321 circuits. It communicates with the service by using the HAProxy
4322 protocol to assign virtual IP addresses to inbound client
4323 circuits. Closes ticket 4700. Patch by Mahrud Sayrafi.
4325 o Major features (onion services, UI change):
4326 - For a newly created onion service, the default version is now 3.
4327 Tor still supports existing version 2 services, but the operator
4328 now needs to set "HiddenServiceVersion 2" in order to create a new
4329 version 2 service. For existing services, Tor now learns the
4330 version by reading the key file. Closes ticket 27215.
4332 o Major features (portability, cryptography, experimental, TLS):
4333 - Tor now has the option to compile with the NSS library instead of
4334 OpenSSL. This feature is experimental, and we expect that bugs may
4335 remain. It is mainly intended for environments where Tor's
4336 performance is not CPU-bound, and where NSS is already known to be
4337 installed. To try it out, configure Tor with the --enable-nss
4338 flag. Closes tickets 26631, 26815, and 26816.
4340 If you are experimenting with this option and using an old cached
4341 consensus, Tor may fail to start. To solve this, delete your
4342 "cached-consensus" and "cached-microdesc-consensus" files,
4343 (if present), and restart Tor.
4345 o Major features (relay, UI change):
4346 - Relays no longer run as exits by default. If the "ExitRelay"
4347 option is auto (or unset), and no exit policy is specified with
4348 ExitPolicy or ReducedExitPolicy, we now treat ExitRelay as 0.
4349 Previously in this case, we allowed exit traffic and logged a
4350 warning message. Closes ticket 21530. Patch by Neel Chauhan.
4351 - Tor now validates that the ContactInfo config option is valid UTF-
4352 8 when parsing torrc. Closes ticket 27428.
4354 o Major bugfixes (compilation):
4355 - Fix compilation on ARM (and other less-used CPUs) when compiling
4356 with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
4358 o Major bugfixes (compilation, rust):
4359 - Rust tests can now build and run successfully with the
4360 --enable-fragile-hardening option enabled. Doing this currently
4361 requires the rust beta channel; it will be possible with stable
4362 rust once Rust version 1.31 is released. Patch from Alex Crichton.
4363 Fixes bugs 27272, 27273, and 27274. Bugfix on 0.3.1.1-alpha.
4365 o Major bugfixes (directory authority):
4366 - Actually check that the address we get from DirAuthority
4367 configuration line is valid IPv4. Explicitly disallow DirAuthority
4368 address to be a DNS hostname. Fixes bug 26488; bugfix
4371 o Major bugfixes (embedding, main loop):
4372 - When DisableNetwork becomes set, actually disable periodic events
4373 that are already enabled. (Previously, we would refrain from
4374 enabling new ones, but we would leave the old ones turned on.)
4375 Fixes bug 28348; bugfix on 0.3.4.1-alpha.
4377 o Major bugfixes (main loop, bootstrap):
4378 - Make sure Tor bootstraps and works properly if only the
4379 ControlPort is set. Prior to this fix, Tor would only bootstrap
4380 when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
4381 port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
4383 o Major bugfixes (onion service v3):
4384 - On an intro point for a version 3 onion service, stop closing
4385 introduction circuits on a NACK. This lets the client decide
4386 whether to reuse the circuit or discard it. Previously, we closed
4387 intro circuits when sending NACKs. Fixes bug 27841; bugfix on
4388 0.3.2.1-alpha. Patch by Neel Chaunan.
4390 o Major bugfixes (OpenSSL, portability):
4391 - Fix our usage of named groups when running as a TLS 1.3 client in
4392 OpenSSL 1.1.1. Previously, we only initialized EC groups when
4393 running as a relay, which caused clients to fail to negotiate TLS
4394 1.3 with relays. Fixes bug 28245; bugfix on 0.2.9.15 (when TLS 1.3
4397 o Major bugfixes (relay bandwidth statistics):
4398 - When we close relayed circuits, report the data in the circuit
4399 queues as being written in our relay bandwidth stats. This
4400 mitigates guard discovery and other attacks that close circuits
4401 for the explicit purpose of noticing this discrepancy in
4402 statistics. Fixes bug 23512; bugfix on 0.0.8pre3.
4404 o Major bugfixes (relay):
4405 - When our write bandwidth limit is exhausted, stop writing on the
4406 connection. Previously, we had a typo in the code that would make
4407 us stop reading instead, leading to relay connections being stuck
4408 indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
4410 - Always reactivate linked connections in the main loop so long as
4411 any linked connection has been active. Previously, connections
4412 serving directory information wouldn't get reactivated after the
4413 first chunk of data was sent (usually 32KB), which would prevent
4414 clients from bootstrapping. Fixes bug 28912; bugfix on
4415 0.3.4.1-alpha. Patch by "cypherpunks3".
4417 o Major bugfixes (restart-in-process):
4418 - Fix a use-after-free error that could be caused by passing Tor an
4419 impossible set of options that would fail during options_act().
4420 Fixes bug 27708; bugfix on 0.3.3.1-alpha.
4422 o Minor features (admin tools):
4423 - Add a new --key-expiration option to print the expiration date of
4424 the signing cert in an ed25519_signing_cert file. Resolves
4427 o Minor features (build):
4428 - If you pass the "--enable-pic" option to configure, Tor will try
4429 to tell the compiler to build position-independent code suitable
4430 to link into a dynamic library. (The default remains -fPIE, for
4431 code suitable for a relocatable executable.) Closes ticket 23846.
4433 o Minor features (code correctness, testing):
4434 - Tor's build process now includes a "check-includes" make target to
4435 verify that no module of Tor relies on any headers from a higher-
4436 level module. We hope to use this feature over time to help
4437 refactor our codebase. Closes ticket 26447.
4439 o Minor features (code layout):
4440 - We have a new "lowest-level" error-handling API for use by code
4441 invoked from within the logging module. With this interface, the
4442 logging code is no longer at risk of calling into itself if a
4443 failure occurs while it is trying to log something. Closes
4446 o Minor features (compilation):
4447 - When possible, place our warning flags in a separate file, to
4448 avoid flooding verbose build logs. Closes ticket 28924.
4449 - Tor's configure script now supports a --with-malloc= option to
4450 select your malloc implementation. Supported options are
4451 "tcmalloc", "jemalloc", "openbsd" (deprecated), and "system" (the
4452 default). Addresses part of ticket 20424. Based on a patch from
4455 o Minor features (config):
4456 - The "auto" keyword in torrc is now case-insensitive. Closes
4459 o Minor features (continuous integration):
4460 - Add a Travis CI build for --enable-nss on Linux gcc. Closes
4462 - Add new CI job to Travis configuration to run stem-based
4463 integration tests. Closes ticket 27913.
4464 - Use the Travis Homebrew addon to install packages on macOS during
4465 Travis CI. The package list is the same, but the Homebrew addon
4466 does not do a `brew update` by default. Implements ticket 27738.
4467 - Report what program produced the mysterious core file that we
4468 occasionally see on Travis CI during make distcheck. Closes
4470 - Don't do a distcheck with --disable-module-dirauth in Travis.
4471 Implements ticket 27252.
4472 - Install libcap-dev and libseccomp2-dev so these optional
4473 dependencies get tested on Travis CI. Closes ticket 26560.
4474 - Only run one online rust build in Travis, to reduce network
4475 errors. Skip offline rust builds on Travis for Linux gcc, because
4476 they're redundant. Implements ticket 27252.
4477 - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
4478 duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
4479 Linux with default settings, because all the non-default builds
4480 use gcc on Linux. Implements ticket 27252.
4482 o Minor features (continuous integration, Windows):
4483 - Always show the configure and test logs, and upload them as build
4484 artifacts, when building for Windows using Appveyor CI.
4486 - Build tor on Windows Server 2012 R2 and Windows Server 2016 using
4487 Appveyor's CI. Closes ticket 28318.
4489 o Minor features (controller):
4490 - Emit CIRC_BW events as soon as we detect that we processed an
4491 invalid or otherwise dropped cell on a circuit. This allows
4492 vanguards and other controllers to react more quickly to dropped
4493 cells. Closes ticket 27678.
4494 - For purposes of CIRC_BW-based dropped cell detection, track half-
4495 closed stream ids, and allow their ENDs, SENDMEs, DATA and path
4496 bias check cells to arrive without counting it as dropped until
4497 either the END arrives, or the windows are empty. Closes
4499 - Implement a 'GETINFO md/all' controller command to enable getting
4500 all known microdescriptors. Closes ticket 8323.
4501 - The GETINFO command now support an "uptime" argument, to return
4502 Tor's uptime in seconds. Closes ticket 25132.
4504 o Minor features (denial-of-service avoidance):
4505 - Make our OOM handler aware of the DNS cache so that it doesn't
4506 fill up the memory. This check is important for our DoS mitigation
4507 subsystem. Closes ticket 18642. Patch by Neel Chauhan.
4509 o Minor features (development):
4510 - Tor's makefile now supports running the "clippy" Rust style tool
4511 on our Rust code. Closes ticket 22156.
4513 o Minor features (directory authority):
4514 - There is no longer an artificial upper limit on the length of
4515 bandwidth lines. Closes ticket 26223.
4516 - When a bandwidth file is used to obtain the bandwidth measurements,
4517 include this bandwidth file headers in the votes. Closes
4519 - Improved support for networks with only a single authority or a
4520 single fallback directory. Patch from Gabriel Somlo. Closes
4523 o Minor features (embedding API):
4524 - The Tor controller API now supports a function to launch Tor with
4525 a preconstructed owning controller FD, so that embedding
4526 applications don't need to manage controller ports and
4527 authentication. Closes ticket 24204.
4528 - The Tor controller API now has a function that returns the name
4529 and version of the backend implementing the API. Closes
4532 o Minor features (fallback directory list):
4533 - Replace the 150 fallbacks originally introduced in Tor
4534 0.3.3.1-alpha in January 2018 (of which ~115 were still
4535 functional), with a list of 157 fallbacks (92 new, 65 existing, 85
4536 removed) generated in December 2018. Closes ticket 24803.
4538 o Minor features (geoip):
4539 - Update geoip and geoip6 to the January 3 2019 Maxmind GeoLite2
4540 Country database. Closes ticket 29012.
4542 o Minor features (memory management):
4543 - Get Libevent to use the same memory allocator as Tor, by calling
4544 event_set_mem_functions() during initialization. Resolves
4547 o Minor features (memory usage):
4548 - When not using them, store legacy TAP public onion keys in DER-
4549 encoded format, rather than as expanded public keys. This should
4550 save several megabytes on typical clients. Closes ticket 27246.
4552 o Minor features (OpenSSL bug workaround):
4553 - Work around a bug in OpenSSL 1.1.1a, which prevented the TLS 1.3
4554 key export function from handling long labels. When this bug is
4555 detected, Tor will disable TLS 1.3. We recommend upgrading to a
4556 version of OpenSSL without this bug when it becomes available.
4557 Closes ticket 28973.
4559 o Minor features (OpenSSL):
4560 - When possible, use RFC5869 HKDF implementation from OpenSSL rather
4561 than our own. Resolves ticket 19979.
4563 o Minor features (performance):
4564 - Remove about 96% of the work from the function that we run at
4565 startup to test our curve25519_basepoint implementation. Since
4566 this function has yet to find an actual failure, we now only run
4567 it for 8 iterations instead of 200. Based on our profile
4568 information, this change should save around 8% of our startup time
4569 on typical desktops, and may have a similar effect on other
4570 platforms. Closes ticket 28838.
4571 - Stop re-validating our hardcoded Diffie-Hellman parameters on
4572 every startup. Doing this wasted time and cycles, especially on
4573 low-powered devices. Closes ticket 28851.
4575 o Minor features (Rust, code quality):
4576 - Improve rust code quality in the rust protover implementation by
4577 making it more idiomatic. Includes changing an internal API to
4578 take &str instead of &String. Closes ticket 26492.
4580 o Minor features (testing):
4581 - Add scripts/test/chutney-git-bisect.sh, for bisecting using
4582 chutney. Implements ticket 27211.
4584 o Minor features (tor-resolve):
4585 - The tor-resolve utility can now be used with IPv6 SOCKS proxies.
4586 Side-effect of the refactoring for ticket 26526.
4588 o Minor features (UI):
4589 - Log each included configuration file or directory as we read it,
4590 to provide more visibility about where Tor is reading from. Patch
4591 from Unto Sten; closes ticket 27186.
4592 - Lower log level of "Scheduler type KIST has been enabled" to INFO.
4593 Closes ticket 26703.
4595 o Minor bugfixes (32-bit OSX and iOS, timing):
4596 - Fix an integer overflow bug in our optimized 32-bit millisecond-
4597 difference algorithm for 32-bit Apple platforms. Previously, it
4598 would overflow when calculating the difference between two times
4599 more than 47 days apart. Fixes part of bug 27139; bugfix
4601 - Improve the precision of our 32-bit millisecond difference
4602 algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
4603 bugfix on 0.3.4.1-alpha.
4604 - Relax the tolerance on the mainloop/update_time_jumps test when
4605 running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
4608 o Minor bugfixes (bootstrap):
4609 - Try harder to get descriptors in non-exit test networks, by using
4610 the mid weight for the third hop when there are no exits. Fixes
4611 bug 27237; bugfix on 0.2.6.2-alpha.
4613 o Minor bugfixes (C correctness):
4614 - Avoid casting smartlist index to int implicitly, as it may trigger
4615 a warning (-Wshorten-64-to-32). Fixes bug 26282; bugfix on
4616 0.2.3.13-alpha, 0.2.7.1-alpha and 0.2.1.1-alpha.
4617 - Use time_t for all values in
4618 predicted_ports_prediction_time_remaining(). Rework the code that
4619 computes difference between durations/timestamps. Fixes bug 27165;
4620 bugfix on 0.3.1.1-alpha.
4622 o Minor bugfixes (client, memory usage):
4623 - When not running as a directory cache, there is no need to store
4624 the text of the current consensus networkstatus in RAM.
4625 Previously, however, clients would store it anyway, at a cost of
4626 over 5 MB. Now, they do not. Fixes bug 27247; bugfix
4629 o Minor bugfixes (client, ReachableAddresses):
4630 - Instead of adding a "reject *:*" line to ReachableAddresses when
4631 loading the configuration, add one to the policy after parsing it
4632 in parse_reachable_addresses(). This prevents extra "reject *.*"
4633 lines from accumulating on reloads. Fixes bug 20874; bugfix on
4634 0.1.1.5-alpha. Patch by Neel Chauhan.
4636 o Minor bugfixes (code quality):
4637 - Rename sandbox_getaddrinfo() and other functions to no longer
4638 misleadingly suggest that they are sandbox-only. Fixes bug 26525;
4639 bugfix on 0.2.7.1-alpha.
4641 o Minor bugfixes (code safety):
4642 - Rewrite our assertion macros so that they no longer suppress the
4643 compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
4646 o Minor bugfixes (compilation):
4647 - Initialize a variable unconditionally in aes_new_cipher(), since
4648 some compilers cannot tell that we always initialize it before
4649 use. Fixes bug 28413; bugfix on 0.2.9.3-alpha.
4651 o Minor bugfixes (configuration):
4652 - Refuse to start with relative file paths and RunAsDaemon set
4653 (regression from the fix for bug 22731). Fixes bug 28298; bugfix
4656 o Minor bugfixes (configuration, Onion Services):
4657 - In rend_service_parse_port_config(), disallow any input to remain
4658 after address-port pair was parsed. This will catch address and
4659 port being whitespace-separated by mistake of the user. Fixes bug
4660 27044; bugfix on 0.2.9.10.
4662 o Minor bugfixes (connection, relay):
4663 - Avoid a logging a BUG() stacktrace when closing connection held
4664 open because the write side is rate limited but not the read side.
4665 Now, the connection read side is simply shut down until Tor is
4666 able to flush the connection and close it. Fixes bug 27750; bugfix
4669 o Minor bugfixes (continuous integration, Windows):
4670 - Stop reinstalling identical packages in our Windows CI. Fixes bug
4671 27464; bugfix on 0.3.4.1-alpha.
4672 - Install only the necessary mingw packages during our appveyor
4673 builds. This change makes the build a little faster, and prevents
4674 a conflict with a preinstalled mingw openssl that appveyor now
4675 ships. Fixes bugs 27765 and 27943; bugfix on 0.3.4.2-alpha.
4676 - Explicitly specify the path to the OpenSSL library and do not
4677 download OpenSSL from Pacman, but instead use the library that is
4678 already provided by AppVeyor. Fixes bug 28574; bugfix on master.
4679 - Manually configure the zstd compiler options, when building using
4680 mingw on Appveyor Windows CI. The MSYS2 mingw zstd package does
4681 not come with a pkg-config file. Fixes bug 28454; bugfix
4683 - Stop using an external OpenSSL install, and stop installing MSYS2
4684 packages, when building using mingw on Appveyor Windows CI. Fixes
4685 bug 28399; bugfix on 0.3.4.1-alpha.
4687 o Minor bugfixes (controller):
4688 - Consider all routerinfo errors other than "not a server" to be
4689 transient for the purpose of "GETINFO exit-policy/*" controller
4690 request. Print stacktrace in the unlikely case of failing to
4691 recompute routerinfo digest. Fixes bug 27034; bugfix
4694 o Minor bugfixes (correctness):
4695 - Fix an unreached code path where we checked the value of
4696 "hostname" inside send_resolved_hostname_cell(). Previously, we
4697 used it before checking it; now we check it first. Fixes bug
4698 28879; bugfix on 0.1.2.7-alpha.
4700 o Minor bugfixes (directory connection shutdown):
4701 - Avoid a double-close when shutting down a stalled directory
4702 connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
4704 o Minor bugfixes (directory permissions):
4705 - When a user requests a group-readable DataDirectory, give it to
4706 them. Previously, when the DataDirectory and the CacheDirectory
4707 were the same, the default setting (0) for
4708 CacheDirectoryGroupReadable would override the setting for
4709 DataDirectoryGroupReadable. Fixes bug 26913; bugfix
4712 o Minor bugfixes (HTTP tunnel):
4713 - Fix a bug warning when closing an HTTP tunnel connection due to an
4714 HTTP request we couldn't handle. Fixes bug 26470; bugfix
4717 o Minor bugfixes (ipv6):
4718 - In addrs_in_same_network_family(), we choose the subnet size based
4719 on the IP version (IPv4 or IPv6). Previously, we chose a fixed
4720 subnet size of /16 for both IPv4 and IPv6 addresses. Fixes bug
4721 15518; bugfix on 0.2.3.1-alpha. Patch by Neel Chauhan.
4723 o Minor bugfixes (Linux seccomp2 sandbox):
4724 - Permit the "shutdown()" system call, which is apparently used by
4725 OpenSSL under some circumstances. Fixes bug 28183; bugfix
4728 o Minor bugfixes (logging):
4729 - Stop talking about the Named flag in log messages. Clients have
4730 ignored the Named flag since 0.3.2. Fixes bug 28441; bugfix
4732 - As a precaution, do an early return from log_addr_has_changed() if
4733 Tor is running as client. Also, log a stack trace for debugging as
4734 this function should only be called when Tor runs as server. Fixes
4735 bug 26892; bugfix on 0.1.1.9-alpha.
4736 - Refrain from mentioning bug 21018 in the logs, as it is already
4737 fixed. Fixes bug 25477; bugfix on 0.2.9.8.
4739 o Minor bugfixes (logging, documentation):
4740 - When SafeLogging is enabled, scrub IP address in
4741 channel_tls_process_netinfo_cell(). Also, add a note to manpage
4742 that scrubbing is not guaranteed on loglevels below Notice. Fixes
4743 bug 26882; bugfix on 0.2.4.10-alpha.
4745 o Minor bugfixes (memory leaks):
4746 - Fix a harmless memory leak in libtorrunner.a. Fixes bug 28419;
4747 bugfix on 0.3.3.1-alpha. Patch from Martin Kepplinger.
4748 - Fix a small memory leak when calling Tor with --dump-config. Fixes
4749 bug 27893; bugfix on 0.3.2.1-alpha.
4751 o Minor bugfixes (netflow padding):
4752 - Ensure circuitmux queues are empty before scheduling or sending
4753 padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
4755 o Minor bugfixes (onion service v2):
4756 - Log at level "info", not "warning", in the case that we do not
4757 have a consensus when a .onion request comes in. This can happen
4758 normally while bootstrapping. Fixes bug 27040; bugfix
4761 o Minor bugfixes (onion service v3):
4762 - When deleting an ephemeral onion service (DEL_ONION), do not close
4763 any rendezvous circuits in order to let the existing client
4764 connections finish by themselves or closed by the application. The
4765 HS v2 is doing that already so now we have the same behavior for
4766 all versions. Fixes bug 28619; bugfix on 0.3.3.1-alpha.
4767 - Build the service descriptor's signing key certificate before
4768 uploading, so we always have a fresh one: leaving no chances for
4769 it to expire service side. Fixes bug 27838; bugfix
4771 - Stop dumping a stack trace when trying to connect to an intro
4772 point without having a descriptor for it. Fixes bug 27774; bugfix
4774 - When selecting a v3 rendezvous point, don't only look at the
4775 protover, but also check whether the curve25519 onion key is
4776 present. This way we avoid picking a relay that supports the v3
4777 rendezvous but for which we don't have the microdescriptor. Fixes
4778 bug 27797; bugfix on 0.3.2.1-alpha.
4779 - Close all SOCKS request (for the same .onion) if the newly fetched
4780 descriptor is unusable. Before that, we would close only the first
4781 one leaving the other hanging and let to time out by themselves.
4782 Fixes bug 27410; bugfix on 0.3.2.1-alpha.
4783 - When the onion service directory can't be created or has the wrong
4784 permissions, do not log a stack trace. Fixes bug 27335; bugfix
4786 - When replacing a descriptor in the client cache, make sure to
4787 close all client introduction circuits for the old descriptor, so
4788 we don't end up with unusable leftover circuits. Fixes bug 27471;
4789 bugfix on 0.3.2.1-alpha.
4791 o Minor bugfixes (OS compatibility):
4792 - Properly handle configuration changes that move a listener to/from
4793 wildcard IP address. If the first attempt to bind a socket fails,
4794 close the old listener and try binding the socket again. Fixes bug
4795 17873; bugfix on 0.0.8pre-1.
4797 o Minor bugfixes (performance)::
4798 - Rework node_is_a_configured_bridge() to no longer call
4799 node_get_all_orports(), which was performing too many memory
4800 allocations. Fixes bug 27224; bugfix on 0.2.3.9.
4802 o Minor bugfixes (protover):
4803 - Reject protocol names containing bytes other than alphanumeric
4804 characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
4807 o Minor bugfixes (protover, rust):
4808 - Reject extra commas in version strings. Fixes bug 27197; bugfix
4810 - protover_all_supported() would attempt to allocate up to 16GB on
4811 some inputs, leading to a potential memory DoS. Fixes bug 27206;
4812 bugfix on 0.3.3.5-rc.
4813 - Compute protover votes correctly in the rust version of the
4814 protover code. Previously, the protover rewrite in 24031 allowed
4815 repeated votes from the same voter for the same protocol version
4816 to be counted multiple times in protover_compute_vote(). Fixes bug
4817 27649; bugfix on 0.3.3.5-rc.
4818 - Reject protover names that contain invalid characters. Fixes bug
4819 27687; bugfix on 0.3.3.1-alpha.
4821 o Minor bugfixes (relay shutdown, systemd):
4822 - Notify systemd of ShutdownWaitLength so it can be set to longer
4823 than systemd's TimeoutStopSec. In Tor's systemd service file, set
4824 TimeoutSec to 60 seconds to allow Tor some time to shut down.
4825 Fixes bug 28113; bugfix on 0.2.6.2-alpha.
4827 o Minor bugfixes (relay statistics):
4828 - Update relay descriptor on bandwidth changes only when the uptime
4829 is smaller than 24h, in order to reduce the efficiency of guard
4830 discovery attacks. Fixes bug 24104; bugfix on 0.1.1.6-alpha.
4832 o Minor bugfixes (relay):
4833 - Consider the fact that we'll be making direct connections to our
4834 entry and guard nodes when computing the fraction of nodes that
4835 have their descriptors. Also, if we are using bridges and there is
4836 at least one bridge with a full descriptor, treat the fraction of
4837 guards available as 100%. Fixes bug 25886; bugfix on 0.2.4.10-alpha.
4838 Patch by Neel Chauhan.
4839 - Update the message logged on relays when DirCache is disabled.
4840 Since 0.3.3.5-rc, authorities require DirCache (V2Dir) for the
4841 Guard flag. Fixes bug 24312; bugfix on 0.3.3.5-rc.
4843 o Minor bugfixes (testing):
4844 - Stop running stem's unit tests as part of "make test-stem", but
4845 continue to run stem's unit and online tests during "make test-
4846 stem-full". Fixes bug 28568; bugfix on 0.2.6.3-alpha.
4847 - Stop leaking memory in an entry guard unit test. Fixes bug 28554;
4848 bugfix on 0.3.0.1-alpha.
4849 - Make the hs_service tests use the same time source when creating
4850 the introduction point and when testing it. Now tests work better
4851 on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
4853 - Revise the "conditionvar_timeout" test so that it succeeds even on
4854 heavily loaded systems where the test threads are not scheduled
4855 within 200 msec. Fixes bug 27073; bugfix on 0.2.6.3-alpha.
4856 - Fix two unit tests to work when HOME environment variable is not
4857 set. Fixes bug 27096; bugfix on 0.2.8.1-alpha.
4858 - If a unit test running in a subprocess exits abnormally or with a
4859 nonzero status code, treat the test as having failed, even if the
4860 test reported success. Without this fix, memory leaks don't cause
4861 the tests to fail, even with LeakSanitizer. Fixes bug 27658;
4862 bugfix on 0.2.2.4-alpha.
4863 - When logging a version mismatch in our openssl_version tests,
4864 report the actual offending version strings. Fixes bug 26152;
4865 bugfix on 0.2.9.1-alpha.
4866 - Fix forking tests on Windows when there is a space somewhere in
4867 the path. Fixes bug 26437; bugfix on 0.2.2.4-alpha.
4869 o Minor bugfixes (Windows):
4870 - Correctly identify Windows 8.1, Windows 10, and Windows Server
4871 2008 and later from their NT versions. Fixes bug 28096; bugfix on
4872 0.2.2.34; reported by Keifer Bly.
4873 - On recent Windows versions, the GetVersionEx() function may report
4874 an earlier Windows version than the running OS. To avoid user
4875 confusion, add "[or later]" to Tor's version string on affected
4876 versions of Windows. Fixes bug 28096; bugfix on 0.2.2.34; reported
4878 - Remove Windows versions that were never supported by the
4879 GetVersionEx() function. Stop duplicating the latest Windows
4880 version in get_uname(). Fixes bug 28096; bugfix on 0.2.2.34;
4881 reported by Keifer Bly.
4883 o Code simplification and refactoring:
4884 - When parsing a port configuration, make it more obvious to static
4885 analyzer tools that we always initialize the address. Closes
4887 - Divide more large Tor source files -- especially ones that span
4888 multiple areas of functionality -- into smaller parts, including
4889 onion.c and main.c. Closes ticket 26747.
4890 - Divide the "routerparse.c" module into separate modules for each
4891 group of parsed objects. Closes ticket 27924.
4892 - Move protover_rust.c to the same place protover.c was moved to.
4893 Closes ticket 27814.
4894 - Split directory.c into separate pieces for client, server, and
4895 common functionality. Closes ticket 26744.
4896 - Split the non-statistics-related parts from the rephist.c and
4897 geoip.c modules. Closes ticket 27892.
4898 - Split the router.c file into relay-only and shared components, to
4899 help with future modularization. Closes ticket 27864.
4900 - Divide the routerlist.c and dirserv.c modules into smaller parts.
4901 Closes ticket 27799.
4902 - 'updateFallbackDirs.py' now ignores the blacklist file, as it's not
4903 longer needed. Closes ticket 26502.
4904 - Include paths to header files within Tor are now qualified by
4905 directory within the top-level src directory.
4906 - Many structures have been removed from the centralized "or.h"
4907 header, and moved into their own headers. This will allow us to
4908 reduce the number of places in the code that rely on each
4909 structure's contents and layout. Closes ticket 26383.
4910 - Remove ATTR_NONNULL macro from codebase. Resolves ticket 26527.
4911 - Remove GetAdaptersAddresses_fn_t. The code that used it was
4912 removed as part of the 26481 refactor. Closes ticket 27467.
4913 - Rework Tor SOCKS server code to use Trunnel and benefit from
4914 autogenerated functions for parsing and generating SOCKS wire
4915 format. New implementation is cleaner, more maintainable and
4916 should be less prone to heartbleed-style vulnerabilities.
4917 Implements a significant fraction of ticket 3569.
4918 - Split sampled_guards_update_from_consensus() and
4919 select_entry_guard_for_circuit() into subfunctions. In
4920 entry_guards_update_primary() unite three smartlist enumerations
4921 into one and move smartlist comparison code out of the function.
4922 Closes ticket 21349.
4923 - Tor now assumes that you have standards-conformant stdint.h and
4924 inttypes.h headers when compiling. Closes ticket 26626.
4925 - Unify our bloom filter logic. Previously we had two copies of this
4926 code: one for routerlist filtering, and one for address set
4927 calculations. Closes ticket 26510.
4928 - Use the simpler strcmpstart() helper in
4929 rend_parse_v2_service_descriptor instead of strncmp(). Closes
4931 - Utility functions that can perform a DNS lookup are now wholly
4932 separated from those that can't, in separate headers and C
4933 modules. Closes ticket 26526.
4936 - In the tor-resolve(1) manpage, fix the reference to socks-
4937 extensions.txt by adding a web URL. Resolves ticket 27853.
4938 - Mention that we require Python to be 2.7 or newer for some
4939 integration tests that we ship with Tor. Resolves ticket 27677.
4940 - Copy paragraph and URL to Tor's code of conduct document from
4941 CONTRIBUTING to new CODE_OF_CONDUCT file. Resolves ticket 26638.
4942 - Remove old instructions from INSTALL document. Closes ticket 26588.
4943 - Warn users that they should not include MyFamily line(s) in their
4944 torrc when running Tor bridge. Closes ticket 26908.
4947 - Tor no longer supports building with the dmalloc library. For
4948 debugging memory issues, we suggest using gperftools or msan
4949 instead. Closes ticket 26426.
4950 - Tor no longer attempts to run on Windows environments without the
4951 GetAdaptersAddresses() function. This function has existed since
4952 Windows XP, which is itself already older than we support.
4953 - Remove Tor2web functionality for version 2 onion services. The
4954 Tor2webMode and Tor2webRendezvousPoints options are now obsolete.
4955 (This feature was never shipped in vanilla Tor and it was only
4956 possible to use this feature by building the support at compile
4957 time. Tor2webMode is not implemented for version 3 onion services.)
4958 Closes ticket 26367.
4961 - Increase logging and tag all log entries with timestamps in
4962 test_rebind.py. Provides diagnostics for issue 28229.
4964 o Code simplification and refactoring (shared random, dirauth):
4965 - Change many tor_assert() to use BUG() instead. The idea is to not
4966 crash a dirauth but rather scream loudly with a stacktrace and let
4967 it continue run. The shared random subsystem is very resilient and
4968 if anything wrong happens with it, at worst a non coherent value
4969 will be put in the vote and discarded by the other authorities.
4970 Closes ticket 19566.
4972 o Documentation (onion services):
4973 - Improve HSv3 client authorization by making some options more
4974 explicit and detailed. Closes ticket 28026. Patch by Mike Tigas.
4975 - Document in the man page that changing ClientOnionAuthDir value or
4976 adding a new file in the directory will not work at runtime upon
4977 sending a HUP if Sandbox 1. Closes ticket 28128.
4978 - Note in the man page that the only real way to fully revoke an
4979 onion service v3 client authorization is by restarting the tor
4980 process. Closes ticket 28275.
4983 Changes in version 0.3.4.9 - 2018-11-02
4984 Tor 0.3.4.9 is the second stable release in its series; it backports
4985 numerous fixes, including a fix for a bandwidth management bug that
4986 was causing memory exhaustion on relays. Anyone running an earlier
4987 version of Tor 0.3.4.9 should upgrade.
4989 o Major bugfixes (compilation, backport from 0.3.5.3-alpha):
4990 - Fix compilation on ARM (and other less-used CPUs) when compiling
4991 with OpenSSL before 1.1. Fixes bug 27781; bugfix on 0.3.4.1-alpha.
4993 o Major bugfixes (mainloop, bootstrap, backport from 0.3.5.3-alpha):
4994 - Make sure Tor bootstraps and works properly if only the
4995 ControlPort is set. Prior to this fix, Tor would only bootstrap
4996 when a client port was set (Socks, Trans, NATD, DNS or HTTPTunnel
4997 port). Fixes bug 27849; bugfix on 0.3.4.1-alpha.
4999 o Major bugfixes (relay, backport from 0.3.5.3-alpha):
5000 - When our write bandwidth limit is exhausted, stop writing on the
5001 connection. Previously, we had a typo in the code that would make
5002 us stop reading instead, leading to relay connections being stuck
5003 indefinitely and consuming kernel RAM. Fixes bug 28089; bugfix
5006 o Major bugfixes (restart-in-process, backport from 0.3.5.1-alpha):
5007 - Fix a use-after-free error that could be caused by passing Tor an
5008 impossible set of options that would fail during options_act().
5009 Fixes bug 27708; bugfix on 0.3.3.1-alpha.
5011 o Minor features (continuous integration, backport from 0.3.5.1-alpha):
5012 - Don't do a distcheck with --disable-module-dirauth in Travis.
5013 Implements ticket 27252.
5014 - Only run one online rust build in Travis, to reduce network
5015 errors. Skip offline rust builds on Travis for Linux gcc, because
5016 they're redundant. Implements ticket 27252.
5017 - Skip gcc on OSX in Travis CI, because it's rarely used. Skip a
5018 duplicate hardening-off build in Travis on Tor 0.2.9. Skip gcc on
5019 Linux with default settings, because all the non-default builds
5020 use gcc on Linux. Implements ticket 27252.
5022 o Minor features (continuous integration, backport from 0.3.5.3-alpha):
5023 - Use the Travis Homebrew addon to install packages on macOS during
5024 Travis CI. The package list is the same, but the Homebrew addon
5025 does not do a `brew update` by default. Implements ticket 27738.
5027 o Minor features (geoip):
5028 - Update geoip and geoip6 to the October 9 2018 Maxmind GeoLite2
5029 Country database. Closes ticket 27991.
5031 o Minor bugfixes (32-bit OSX and iOS, timing, backport from 0.3.5.2-alpha):
5032 - Fix an integer overflow bug in our optimized 32-bit millisecond-
5033 difference algorithm for 32-bit Apple platforms. Previously, it
5034 would overflow when calculating the difference between two times
5035 more than 47 days apart. Fixes part of bug 27139; bugfix
5037 - Improve the precision of our 32-bit millisecond difference
5038 algorithm for 32-bit Apple platforms. Fixes part of bug 27139;
5039 bugfix on 0.3.4.1-alpha.
5040 - Relax the tolerance on the mainloop/update_time_jumps test when
5041 running on 32-bit Apple platforms. Fixes part of bug 27139; bugfix
5044 o Minor bugfixes (C correctness, to appear in 0.3.5.4-alpha):
5045 - Avoid undefined behavior in an end-of-string check when parsing
5046 the BEGIN line in a directory object. Fixes bug 28202; bugfix
5049 o Minor bugfixes (CI, appveyor, to appear in 0.3.5.4-alpha):
5050 - Only install the necessary mingw packages during our appveyor
5051 builds. This change makes the build a little faster, and prevents
5052 a conflict with a preinstalled mingw openssl that appveyor now
5053 ships. Fixes bugs 27943 and 27765; bugfix on 0.3.4.2-alpha.
5055 o Minor bugfixes (code safety, backport from 0.3.5.3-alpha):
5056 - Rewrite our assertion macros so that they no longer suppress the
5057 compiler's -Wparentheses warnings. Fixes bug 27709; bugfix
5059 o Minor bugfixes (continuous integration, backport from 0.3.5.1-alpha):
5060 - Stop reinstalling identical packages in our Windows CI. Fixes bug
5061 27464; bugfix on 0.3.4.1-alpha.
5063 o Minor bugfixes (directory authority, to appear in 0.3.5.4-alpha):
5064 - Log additional info when we get a relay that shares an ed25519 ID
5065 with a different relay, instead making a BUG() warning. Fixes bug
5066 27800; bugfix on 0.3.2.1-alpha.
5068 o Minor bugfixes (directory connection shutdown, backport from 0.3.5.1-alpha):
5069 - Avoid a double-close when shutting down a stalled directory
5070 connection. Fixes bug 26896; bugfix on 0.3.4.1-alpha.
5072 o Minor bugfixes (HTTP tunnel, backport from 0.3.5.1-alpha):
5073 - Fix a bug warning when closing an HTTP tunnel connection due to an
5074 HTTP request we couldn't handle. Fixes bug 26470; bugfix
5077 o Minor bugfixes (netflow padding, backport from 0.3.5.1-alpha):
5078 - Ensure circuitmux queues are empty before scheduling or sending
5079 padding. Fixes bug 25505; bugfix on 0.3.1.1-alpha.
5081 o Minor bugfixes (onion service v3, backport from 0.3.5.1-alpha):
5082 - When the onion service directory can't be created or has the wrong
5083 permissions, do not log a stack trace. Fixes bug 27335; bugfix
5086 o Minor bugfixes (onion service v3, backport from 0.3.5.2-alpha):
5087 - Close all SOCKS request (for the same .onion) if the newly fetched
5088 descriptor is unusable. Before that, we would close only the first
5089 one leaving the other hanging and let to time out by themselves.
5090 Fixes bug 27410; bugfix on 0.3.2.1-alpha.
5092 o Minor bugfixes (onion service v3, backport from 0.3.5.3-alpha):
5093 - When selecting a v3 rendezvous point, don't only look at the
5094 protover, but also check whether the curve25519 onion key is
5095 present. This way we avoid picking a relay that supports the v3
5096 rendezvous but for which we don't have the microdescriptor. Fixes
5097 bug 27797; bugfix on 0.3.2.1-alpha.
5099 o Minor bugfixes (protover, backport from 0.3.5.3-alpha):
5100 - Reject protocol names containing bytes other than alphanumeric
5101 characters and hyphens ([A-Za-z0-9-]). Fixes bug 27316; bugfix
5104 o Minor bugfixes (rust, backport from 0.3.5.1-alpha):
5105 - Compute protover votes correctly in the rust version of the
5106 protover code. Previously, the protover rewrite in 24031 allowed
5107 repeated votes from the same voter for the same protocol version
5108 to be counted multiple times in protover_compute_vote(). Fixes bug
5109 27649; bugfix on 0.3.3.5-rc.
5110 - Reject protover names that contain invalid characters. Fixes bug
5111 27687; bugfix on 0.3.3.1-alpha.
5113 o Minor bugfixes (rust, backport from 0.3.5.2-alpha):
5114 - protover_all_supported() would attempt to allocate up to 16GB on
5115 some inputs, leading to a potential memory DoS. Fixes bug 27206;
5116 bugfix on 0.3.3.5-rc.
5118 o Minor bugfixes (rust, directory authority, to appear in 0.3.5.4-alpha):
5119 - Fix an API mismatch in the rust implementation of
5120 protover_compute_vote(). This bug could have caused crashes on any
5121 directory authorities running Tor with Rust (which we do not yet
5122 recommend). Fixes bug 27741; bugfix on 0.3.3.6.
5124 o Minor bugfixes (rust, to appear in 0.3.5.4-alpha):
5125 - Fix a potential null dereference in protover_all_supported(). Add
5126 a test for it. Fixes bug 27804; bugfix on 0.3.3.1-alpha.
5127 - Return a string that can be safely freed by C code, not one
5128 created by the rust allocator, in protover_all_supported(). Fixes
5129 bug 27740; bugfix on 0.3.3.1-alpha.
5131 o Minor bugfixes (testing, backport from 0.3.5.1-alpha):
5132 - If a unit test running in a subprocess exits abnormally or with a
5133 nonzero status code, treat the test as having failed, even if the
5134 test reported success. Without this fix, memory leaks don't cause
5135 the tests to fail, even with LeakSanitizer. Fixes bug 27658;
5136 bugfix on 0.2.2.4-alpha.
5138 o Minor bugfixes (testing, backport from 0.3.5.3-alpha):
5139 - Make the hs_service tests use the same time source when creating
5140 the introduction point and when testing it. Now tests work better
5141 on very slow systems like ARM or Travis. Fixes bug 27810; bugfix
5144 o Minor bugfixes (testing, to appear in 0.3.5.4-alpha):
5145 - Treat backtrace test failures as expected on BSD-derived systems
5146 (NetBSD, OpenBSD, and macOS/Darwin) until we solve bug 17808.
5147 (FreeBSD failures have been treated as expected since 18204 in
5148 0.2.8.) Fixes bug 27948; bugfix on 0.2.5.2-alpha.
5151 Changes in version 0.2.9.17 - 2018-09-10
5152 Tor 0.2.9.17 backports numerous bugfixes from later versions of Tor.
5154 o Minor features (compatibility, backport from 0.3.4.8):
5155 - Tell OpenSSL to maintain backward compatibility with previous
5156 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
5157 ciphers are disabled by default. Closes ticket 27344.
5159 o Minor features (continuous integration, backport from 0.3.4.7-rc):
5160 - Enable macOS builds in our Travis CI configuration. Closes
5162 - Install libcap-dev and libseccomp2-dev so these optional
5163 dependencies get tested on Travis CI. Closes ticket 26560.
5164 - Run asciidoc during Travis CI. Implements ticket 27087.
5165 - Use ccache in our Travis CI configuration. Closes ticket 26952.
5167 o Minor features (geoip):
5168 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
5169 Country database. Closes ticket 27089.
5171 o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
5172 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
5173 tell the compiler not to include the system malloc implementation.
5174 Fixes bug 20424; bugfix on 0.2.0.20-rc.
5176 o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
5177 - Silence a spurious compiler warning on the GetAdaptersAddresses
5178 function pointer cast. This issue is already fixed by 26481 in
5179 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
5180 bugfix on 0.2.3.11-alpha.
5181 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
5182 supported, and always fails. Some compilers warn about the
5183 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
5186 o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
5187 - Don't link or search for pthreads when building for Windows, even
5188 if we are using build environment (like mingw) that provides a
5189 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
5191 o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
5192 - Skip a pair of unreliable key generation tests on Windows, until
5193 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
5194 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
5196 o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
5197 - Pass the module flags to distcheck configure, and log the flags
5198 before running configure. (Backported to 0.2.9 and later as a
5199 precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
5201 o Minor bugfixes (continuous integration, backport from 0.3.4.8):
5202 - When a Travis build fails, and showing a log fails, keep trying to
5203 show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
5204 - When we use echo in Travis, don't pass a --flag as the first
5205 argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
5207 o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
5208 - When voting for recommended versions, make sure that all of the
5209 versions are well-formed and parsable. Fixes bug 26485; bugfix
5212 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
5213 - Fix a bug in out sandboxing rules for the openat() syscall.
5214 Previously, no openat() call would be permitted, which would break
5215 filesystem operations on recent glibc versions. Fixes bug 25440;
5216 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
5218 o Minor bugfixes (onion services, backport from 0.3.4.8):
5219 - Silence a spurious compiler warning in
5220 rend_client_send_introduction(). Fixes bug 27463; bugfix
5223 o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
5224 - Log a protocol warning when single onion services or Tor2web clients
5225 fail to authenticate direct connections to relays.
5226 Fixes bug 26924; bugfix on 0.2.9.1-alpha.
5228 o Minor bugfixes (testing, backport from 0.3.4.6-rc):
5229 - Disable core dumps in test_bt.sh, to avoid failures in "make
5230 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
5232 o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
5233 - Before running make test-network-all, delete old logs and test
5234 result files, to avoid spurious failures. Fixes bug 27295; bugfix
5237 o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
5238 - Our "tortls/cert_matches_key" unit test no longer relies on
5239 OpenSSL internals. Previously, it relied on unsupported OpenSSL
5240 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
5241 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
5243 o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
5244 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
5245 27185; bugfix on 0.2.2.2-alpha.
5248 Changes in version 0.3.2.12 - 2018-09-10
5249 Tor 0.3.2.12 backport numerous fixes from later versions of Tor.
5251 o Minor features (compatibility, backport from 0.3.4.8):
5252 - Tell OpenSSL to maintain backward compatibility with previous
5253 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
5254 ciphers are disabled by default. Closes ticket 27344.
5256 o Minor features (continuous integration, backport from 0.3.4.7-rc):
5257 - Enable macOS builds in our Travis CI configuration. Closes
5259 - Install libcap-dev and libseccomp2-dev so these optional
5260 dependencies get tested on Travis CI. Closes ticket 26560.
5261 - Run asciidoc during Travis CI. Implements ticket 27087.
5262 - Use ccache in our Travis CI configuration. Closes ticket 26952.
5264 o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
5265 - Use cargo cache in our Travis CI configuration. Closes
5268 o Minor features (controller, backport from 0.3.4.6-rc):
5269 - The control port now exposes the list of HTTPTunnelPorts and
5270 ExtOrPorts via GETINFO net/listeners/httptunnel and
5271 net/listeners/extor respectively. Closes ticket 26647.
5273 o Minor features (directory authorities, backport from 0.3.4.7-rc):
5274 - Authorities no longer vote to make the subprotocol version
5275 "LinkAuth=1" a requirement: it is unsupportable with NSS, and
5276 hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
5278 o Minor features (geoip):
5279 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
5280 Country database. Closes ticket 27089.
5282 o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
5283 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
5284 tell the compiler not to include the system malloc implementation.
5285 Fixes bug 20424; bugfix on 0.2.0.20-rc.
5286 - Don't try to use a pragma to temporarily disable the
5287 -Wunused-const-variable warning if the compiler doesn't support
5288 it. Fixes bug 26785; bugfix on 0.3.2.11.
5290 o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
5291 - Silence a spurious compiler warning on the GetAdaptersAddresses
5292 function pointer cast. This issue is already fixed by 26481 in
5293 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
5294 bugfix on 0.2.3.11-alpha.
5295 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
5296 supported, and always fails. Some compilers warn about the
5297 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
5300 o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
5301 - Don't link or search for pthreads when building for Windows, even
5302 if we are using build environment (like mingw) that provides a
5303 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
5305 o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
5306 - Skip a pair of unreliable key generation tests on Windows, until
5307 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
5308 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
5310 o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
5311 - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
5312 - Pass the module flags to distcheck configure, and log the flags
5313 before running configure. (Backported to 0.2.9 and later as a
5314 precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
5316 o Minor bugfixes (continuous integration, backport from 0.3.4.8):
5317 - When a Travis build fails, and showing a log fails, keep trying to
5318 show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
5319 - When we use echo in Travis, don't pass a --flag as the first
5320 argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
5322 o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
5323 - When voting for recommended versions, make sure that all of the
5324 versions are well-formed and parsable. Fixes bug 26485; bugfix
5327 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
5328 - Fix a bug in out sandboxing rules for the openat() syscall.
5329 Previously, no openat() call would be permitted, which would break
5330 filesystem operations on recent glibc versions. Fixes bug 25440;
5331 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
5333 o Minor bugfixes (logging, backport from 0.3.4.6-rc):
5334 - Improve the log message when connection initiators fail to
5335 authenticate direct connections to relays. Fixes bug 26927; bugfix
5338 o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
5339 - Fix bug that causes services to not ever rotate their descriptors
5340 if they were getting SIGHUPed often. Fixes bug 26932; bugfix
5343 o Minor bugfixes (onion services, backport from 0.3.4.8):
5344 - Silence a spurious compiler warning in
5345 rend_client_send_introduction(). Fixes bug 27463; bugfix
5348 o Minor bugfixes (rust, backport from 0.3.4.7-rc):
5349 - Backport test_rust.sh from master. Fixes bug 26497; bugfix
5351 - Consistently use ../../.. as a fallback for $abs_top_srcdir in
5352 test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
5353 - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
5354 $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
5356 o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
5357 - Log a protocol warning when single onion services or Tor2web clients
5358 fail to authenticate direct connections to relays.
5359 Fixes bug 26924; bugfix on 0.2.9.1-alpha.
5361 o Minor bugfixes (testing, backport from 0.3.4.6-rc):
5362 - Disable core dumps in test_bt.sh, to avoid failures in "make
5363 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
5365 o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
5366 - When running make test-network-all, use the mixed+hs-v2 network.
5367 (A previous fix to chutney removed v3 onion services from the
5368 mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
5369 confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
5370 - Before running make test-network-all, delete old logs and test
5371 result files, to avoid spurious failures. Fixes bug 27295; bugfix
5374 o Minor bugfixes (testing, openssl compatibility):
5375 - Our "tortls/cert_matches_key" unit test no longer relies on OpenSSL
5376 internals. Previously, it relied on unsupported OpenSSL behavior in
5377 a way that caused it to crash with OpenSSL 1.0.2p. Fixes bug 27226;
5378 bugfix on 0.2.5.1-alpha.
5380 o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
5381 - Our "tortls/cert_matches_key" unit test no longer relies on
5382 OpenSSL internals. Previously, it relied on unsupported OpenSSL
5383 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
5384 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
5386 o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
5387 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
5388 27185; bugfix on 0.2.2.2-alpha.
5391 Changes in version 0.3.3.10 - 2018-09-10
5392 Tor 0.3.3.10 backports numerous fixes from later versions of Tor.
5394 o Minor features (bug workaround, backport from 0.3.4.7-rc):
5395 - Compile correctly on systems that provide the C11 stdatomic.h
5396 header, but where C11 atomic functions don't actually compile.
5397 Closes ticket 26779; workaround for Debian issue 903709.
5399 o Minor features (compatibility, backport from 0.3.4.8):
5400 - Tell OpenSSL to maintain backward compatibility with previous
5401 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
5402 ciphers are disabled by default. Closes ticket 27344.
5404 o Minor features (continuous integration, backport from 0.3.4.7-rc):
5405 - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
5406 - Enable macOS builds in our Travis CI configuration. Closes
5408 - Install libcap-dev and libseccomp2-dev so these optional
5409 dependencies get tested on Travis CI. Closes ticket 26560.
5410 - Run asciidoc during Travis CI. Implements ticket 27087.
5411 - Use ccache in our Travis CI configuration. Closes ticket 26952.
5413 o Minor features (continuous integration, rust, backport from 0.3.4.7-rc):
5414 - Use cargo cache in our Travis CI configuration. Closes
5417 o Minor features (controller, backport from 0.3.4.6-rc):
5418 - The control port now exposes the list of HTTPTunnelPorts and
5419 ExtOrPorts via GETINFO net/listeners/httptunnel and
5420 net/listeners/extor respectively. Closes ticket 26647.
5422 o Minor features (directory authorities, backport from 0.3.4.7-rc):
5423 - Authorities no longer vote to make the subprotocol version
5424 "LinkAuth=1" a requirement: it is unsupportable with NSS, and
5425 hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
5427 o Minor features (geoip):
5428 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
5429 Country database. Closes ticket 27089.
5431 o Minor bugfixes (compilation, backport from 0.3.4.6-rc):
5432 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
5433 tell the compiler not to include the system malloc implementation.
5434 Fixes bug 20424; bugfix on 0.2.0.20-rc.
5435 - Don't try to use a pragma to temporarily disable the
5436 -Wunused-const-variable warning if the compiler doesn't support
5437 it. Fixes bug 26785; bugfix on 0.3.2.11.
5439 o Minor bugfixes (compilation, backport from 0.3.4.7-rc):
5440 - Silence a spurious compiler warning on the GetAdaptersAddresses
5441 function pointer cast. This issue is already fixed by 26481 in
5442 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
5443 bugfix on 0.2.3.11-alpha.
5444 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
5445 supported, and always fails. Some compilers warn about the
5446 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
5449 o Minor bugfixes (compilation, windows, backport from 0.3.4.7-rc):
5450 - Don't link or search for pthreads when building for Windows, even
5451 if we are using build environment (like mingw) that provides a
5452 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
5454 o Minor bugfixes (continuous integration, backport from 0.3.4.6-rc):
5455 - Skip a pair of unreliable key generation tests on Windows, until
5456 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
5457 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
5459 o Minor bugfixes (continuous integration, backport from 0.3.4.7-rc):
5460 - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
5461 - Pass the module flags to distcheck configure, and log the flags
5462 before running configure. (Backported to 0.2.9 and later as a
5463 precaution.) Fixes bug 27088; bugfix on 0.3.4.1-alpha.
5465 o Minor bugfixes (continuous integration, backport from 0.3.4.8):
5466 - When a Travis build fails, and showing a log fails, keep trying to
5467 show the other logs. Fixes bug 27453; bugfix on 0.3.4.7-rc.
5468 - When we use echo in Travis, don't pass a --flag as the first
5469 argument. Fixes bug 27418; bugfix on 0.3.4.7-rc.
5471 o Minor bugfixes (directory authority, backport from 0.3.4.6-rc):
5472 - When voting for recommended versions, make sure that all of the
5473 versions are well-formed and parsable. Fixes bug 26485; bugfix
5476 o Minor bugfixes (in-process restart, backport from 0.3.4.7-rc):
5477 - Always call tor_free_all() when leaving tor_run_main(). When we
5478 did not, restarting tor in-process would cause an assertion
5479 failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
5481 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.4.7-rc):
5482 - Fix a bug in our sandboxing rules for the openat() syscall.
5483 Previously, no openat() call would be permitted, which would break
5484 filesystem operations on recent glibc versions. Fixes bug 25440;
5485 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
5487 o Minor bugfixes (logging, backport from 0.3.4.6-rc):
5488 - Improve the log message when connection initiators fail to
5489 authenticate direct connections to relays. Fixes bug 26927; bugfix
5492 o Minor bugfixes (onion services, backport from 0.3.4.7-rc):
5493 - Fix bug that causes services to not ever rotate their descriptors
5494 if they were getting SIGHUPed often. Fixes bug 26932; bugfix
5497 o Minor bugfixes (onion services, backport from 0.3.4.8):
5498 - Silence a spurious compiler warning in
5499 rend_client_send_introduction(). Fixes bug 27463; bugfix
5502 o Minor bugfixes (portability, backport from 0.3.4.6-rc):
5503 - Work around two different bugs in the OS X 10.10 and later SDKs
5504 that would prevent us from successfully targeting earlier versions
5505 of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
5507 o Minor bugfixes (portability, backport from 0.3.4.7-rc):
5508 - Fix compilation of the unit tests on GNU/Hurd, which does not
5509 define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
5512 o Minor bugfixes (rust, backport from 0.3.4.7-rc):
5513 - Backport test_rust.sh from master. Fixes bug 26497; bugfix
5515 - Consistently use ../../.. as a fallback for $abs_top_srcdir in
5516 test_rust.sh. Fixes bug 27093; bugfix on 0.3.4.3-alpha.
5517 - Protover parsing was accepting the presence of whitespace in
5518 version strings, which the C implementation would choke on, e.g.
5519 "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
5520 - Protover parsing was ignoring a 2nd hyphen and everything after
5521 it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
5523 - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
5524 $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
5525 - cd to ${abs_top_builddir}/src/rust before running cargo in
5526 src/test/test_rust.sh. This makes the working directory consistent
5527 between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
5529 o Minor bugfixes (single onion services, Tor2web, backport from 0.3.4.6-rc):
5530 - Log a protocol warning when single onion services or Tor2web clients
5531 fail to authenticate direct connections to relays.
5532 Fixes bug 26924; bugfix on 0.2.9.1-alpha.
5534 o Minor bugfixes (testing, backport from 0.3.4.6-rc):
5535 - Disable core dumps in test_bt.sh, to avoid failures in "make
5536 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
5538 o Minor bugfixes (testing, chutney, backport from 0.3.4.8):
5539 - When running make test-network-all, use the mixed+hs-v2 network.
5540 (A previous fix to chutney removed v3 onion services from the
5541 mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
5542 confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
5543 - Before running make test-network-all, delete old logs and test
5544 result files, to avoid spurious failures. Fixes bug 27295; bugfix
5547 o Minor bugfixes (testing, openssl compatibility, backport from 0.3.4.7-rc):
5548 - Our "tortls/cert_matches_key" unit test no longer relies on
5549 OpenSSL internals. Previously, it relied on unsupported OpenSSL
5550 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
5551 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
5553 o Minor bugfixes (v3 onion services, backport from 0.3.4.6-rc):
5554 - Stop sending ed25519 link specifiers in v3 onion service introduce
5555 cells and descriptors, when the rendezvous or introduction point
5556 doesn't support ed25519 link authentication. Fixes bug 26627;
5557 bugfix on 0.3.2.4-alpha.
5559 o Minor bugfixes (Windows, compilation, backport from 0.3.4.7-rc):
5560 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
5561 27185; bugfix on 0.2.2.2-alpha.
5564 Changes in version 0.3.4.8 - 2018-09-10
5565 Tor 0.3.4.8 is the first stable release in its series; it includes
5566 compilation and portability fixes.
5568 The Tor 0.3.4 series includes improvements for running Tor in
5569 low-power and embedded environments, which should help performance in
5570 general. We've begun work on better modularity, and included preliminary
5571 changes on the directory authority side to accommodate a new bandwidth
5572 measurement system. We've also integrated more continuous-integration
5573 systems into our development process, and made corresponding changes to
5574 Tor's testing infrastructure. Finally, we've continued to refine
5575 our anti-denial-of-service code.
5577 Below are the changes since 0.3.3.9. For a list of only the changes
5578 since 0.3.4.7-rc, see the ChangeLog file.
5580 o New system requirements:
5581 - Tor no longer tries to support old operating systems without
5582 mmap() or some local equivalent. Apparently, compilation on such
5583 systems has been broken for some time, without anybody noticing or
5584 complaining. Closes ticket 25398.
5586 o Major features (directory authority, modularization):
5587 - The directory authority subsystem has been modularized. The code
5588 is now located in src/or/dirauth/, and is compiled in by default.
5589 To disable the module, the configure option
5590 --disable-module-dirauth has been added. This module may be
5591 disabled by default in some future release. Closes ticket 25610.
5593 o Major features (main loop, CPU usage):
5594 - When Tor is disabled (via DisableNetwork or via hibernation), it
5595 no longer needs to run any per-second events. This change should
5596 make it easier for mobile applications to disable Tor while the
5597 device is sleeping, or Tor is not running. Closes ticket 26063.
5598 - Tor no longer enables all of its periodic events by default.
5599 Previously, Tor would enable all possible main loop events,
5600 regardless of whether it needed them. Furthermore, many of these
5601 events are now disabled when Tor is hibernating or DisableNetwork
5602 is set. This is a big step towards reducing client CPU usage by
5603 reducing the amount of wake-ups the daemon does. Closes tickets
5605 - The bandwidth-limitation logic has been refactored so that
5606 bandwidth calculations are performed on-demand, rather than every
5607 TokenBucketRefillInterval milliseconds. This change should improve
5608 the granularity of our bandwidth calculations, and limit the
5609 number of times that the Tor process needs to wake up when it is
5610 idle. Closes ticket 25373.
5611 - Move responsibility for many operations from a once-per-second
5612 callback to a callback that is only scheduled as needed. Moving
5613 this functionality has allowed us to disable the callback when
5614 Tor's network is disabled. Once enough items are removed from our
5615 once-per-second callback, we can eliminate it entirely to conserve
5616 CPU when idle. The functionality removed includes: closing
5617 connections, circuits, and channels (ticket 25932); consensus
5618 voting (25937); flushing log callbacks (25951); honoring delayed
5619 SIGNEWNYM requests (25949); rescanning the consensus cache
5620 (25931); saving the state file to disk (25948); warning relay
5621 operators about unreachable ports (25952); and keeping track of
5622 Tor's uptime (26009).
5624 o Minor features (accounting):
5625 - When Tor becomes dormant, it now uses a scheduled event to wake up
5626 at the right time. Previously, we would use the per-second timer
5627 to check whether to wake up, but we no longer have any per-second
5628 timers enabled when the network is disabled. Closes ticket 26064.
5630 o Minor features (bug workaround):
5631 - Compile correctly on systems that provide the C11 stdatomic.h
5632 header, but where C11 atomic functions don't actually compile.
5633 Closes ticket 26779; workaround for Debian issue 903709.
5635 o Minor features (code quality):
5636 - Add optional spell-checking for the Tor codebase, using the
5637 "misspell" program. To use this feature, run "make check-typos".
5638 Closes ticket 25024.
5640 o Minor features (compatibility):
5641 - Tell OpenSSL to maintain backward compatibility with previous
5642 RSA1024/DH1024 users in Tor. With OpenSSL 1.1.1-pre6, these
5643 ciphers are disabled by default. Closes ticket 27344.
5644 - Tor now detects versions of OpenSSL 1.1.0 and later compiled with
5645 the no-deprecated option, and builds correctly with them. Closes
5646 tickets 19429, 19981, and 25353.
5648 o Minor features (compilation):
5649 - When compiling with --enable-openbsd-malloc or --enable-tcmalloc,
5650 tell the compiler not to include the system malloc implementation.
5651 Fixes bug 20424; bugfix on 0.2.0.20-rc.
5652 - Don't try to use a pragma to temporarily disable the
5653 -Wunused-const-variable warning if the compiler doesn't support
5654 it. Fixes bug 26785; bugfix on 0.3.2.11.
5655 - When building Tor, prefer to use Python 3 over Python 2, and more
5656 recent (contemplated) versions over older ones. Closes
5659 o Minor features (compression, zstd):
5660 - When running with zstd, Tor now considers using advanced functions
5661 that the zstd maintainers have labeled as potentially unstable. To
5662 prevent breakage, Tor will only use this functionality when the
5663 runtime version of the zstd library matches the version with which
5664 Tor was compiled. Closes ticket 25162.
5666 o Minor features (configuration):
5667 - The "DownloadSchedule" options have been renamed to end with
5668 "DownloadInitialDelay". The old names are still allowed, but will
5669 produce a warning. Comma-separated lists are still permitted for
5670 these options, but all values after the first are ignored (as they
5671 have been since 0.2.9). Closes ticket 23354.
5673 o Minor features (continuous integration):
5674 - Log the compiler path and version during Appveyor builds.
5675 Implements ticket 27449.
5676 - Show config.log and test-suite.log after failed Appveyor builds.
5677 Also upload the zipped full logs as a build artifact. Implements
5679 - Backport Travis rust distcheck to 0.3.3. Closes ticket 24629.
5680 - Enable macOS builds in our Travis CI configuration. Closes
5682 - Install libcap-dev and libseccomp2-dev so these optional
5683 dependencies get tested on Travis CI. Closes ticket 26560.
5684 - Only post Appveyor IRC notifications when the build fails.
5685 Implements ticket 27275.
5686 - Run asciidoc during Travis CI. Implements ticket 27087.
5687 - Use ccache in our Travis CI configuration. Closes ticket 26952.
5688 - Add the necessary configuration files for continuous integration
5689 testing on Windows, via the Appveyor platform. Closes ticket
5690 25549. Patches from Marcin Cieślak and Isis Lovecruft.
5692 o Minor features (continuous integration, rust):
5693 - Use cargo cache in our Travis CI configuration. Closes
5696 o Minor features (control port):
5697 - Introduce GETINFO "current-time/{local,utc}" to return the local
5698 and UTC times respectively in ISO format. This helps a controller
5699 like Tor Browser detect a time-related error. Closes ticket 25511.
5700 Patch by Neel Chauhan.
5701 - Introduce new fields to the CIRC_BW event. There are two new
5702 fields in each of the read and written directions. The DELIVERED
5703 fields report the total valid data on the circuit, as measured by
5704 the payload sizes of verified and error-checked relay command
5705 cells. The OVERHEAD fields report the total unused bytes in each
5706 of these cells. Closes ticket 25903.
5708 o Minor features (controller):
5709 - The control port now exposes the list of HTTPTunnelPorts and
5710 ExtOrPorts via GETINFO net/listeners/httptunnel and
5711 net/listeners/extor respectively. Closes ticket 26647.
5713 o Minor features (directory authorities):
5714 - Stop warning about incomplete bw lines before the first complete
5715 bw line has been found, so that additional header lines can be
5716 ignored. Fixes bug 25960; bugfix on 0.2.2.1-alpha
5717 - Authorities no longer vote to make the subprotocol version
5718 "LinkAuth=1" a requirement: it is unsupportable with NSS, and
5719 hasn't been needed since Tor 0.3.0.1-alpha. Closes ticket 27286.
5721 o Minor features (directory authority):
5722 - Directory authorities now open their key-pinning files as O_SYNC,
5723 to limit their chances of accidentally writing partial lines.
5724 Closes ticket 23909.
5726 o Minor features (directory authority, forward compatibility):
5727 - Make the lines of the measured bandwidth file able to contain
5728 their entries in any order. Previously, the node_id entry needed
5729 to come first. Closes ticket 26004.
5731 o Minor features (entry guards):
5732 - Introduce a new torrc option NumPrimaryGuards for controlling the
5733 number of primary guards. Closes ticket 25843.
5735 o Minor features (geoip):
5736 - Update geoip and geoip6 to the August 7 2018 Maxmind GeoLite2
5737 Country database. Closes ticket 27089.
5739 o Minor features (performance):
5740 - Avoid a needless call to malloc() when processing an incoming
5741 relay cell. Closes ticket 24914.
5742 - Make our timing-wheel code run a tiny bit faster on 32-bit
5743 platforms, by preferring 32-bit math to 64-bit. Closes
5745 - Avoid a needless malloc()/free() pair every time we handle an ntor
5746 handshake. Closes ticket 25150.
5748 o Minor features (Rust, portability):
5749 - Rust cross-compilation is now supported. Closes ticket 25895.
5751 o Minor features (testing):
5752 - Add a unit test for voting_schedule_get_start_of_next_interval().
5753 Closes ticket 26014, and helps make unit test coverage
5755 - A new unittests module specifically for testing the functions in
5756 the (new-ish) bridges.c module has been created with new
5757 unittests, raising the code coverage percentages. Closes 25425.
5758 - We now have improved testing for addressmap_get_virtual_address()
5759 function. This should improve our test coverage, and make our test
5760 coverage more deterministic. Closes ticket 25993.
5762 o Minor features (timekeeping, circuit scheduling):
5763 - When keeping track of how busy each circuit have been recently on
5764 a given connection, use coarse-grained monotonic timers rather
5765 than gettimeofday(). This change should marginally increase
5766 accuracy and performance. Implements part of ticket 25927.
5768 o Minor features (unit tests):
5769 - Test complete bandwidth measurements files, and test that
5770 incomplete bandwidth lines only give warnings when the end of the
5771 header has not been detected. Fixes bug 25947; bugfix
5774 o Minor bugfixes (bandwidth management):
5775 - Consider ourselves "low on write bandwidth" if we have exhausted
5776 our write bandwidth some time in the last second. This was the
5777 documented behavior before, but the actual behavior was to change
5778 this value every TokenBucketRefillInterval. Fixes bug 25828;
5779 bugfix on 0.2.3.5-alpha.
5781 o Minor bugfixes (C correctness):
5782 - Add a missing lock acquisition in the shutdown code of the control
5783 subsystem. Fixes bug 25675; bugfix on 0.2.7.3-rc. Found by
5784 Coverity; this is CID 1433643.
5786 o Minor bugfixes (code style):
5787 - Fixed multiple includes of transports.h in src/or/connection.c
5788 Fixes bug 25261; bugfix on 0.2.5.1-alpha.
5789 - Remove the unused variable n_possible from the function
5790 channel_get_for_extend(). Fixes bug 25645; bugfix on 0.2.4.4-alpha
5792 o Minor bugfixes (compilation):
5793 - Silence a spurious compiler warning on the GetAdaptersAddresses
5794 function pointer cast. This issue is already fixed by 26481 in
5795 0.3.5 and later, by removing the lookup and cast. Fixes bug 27465;
5796 bugfix on 0.2.3.11-alpha.
5797 - Stop calling SetProcessDEPPolicy() on 64-bit Windows. It is not
5798 supported, and always fails. Some compilers warn about the
5799 function pointer cast on 64-bit Windows. Fixes bug 27461; bugfix
5801 - Fix a compilation warning on some versions of GCC when building
5802 code that calls routerinfo_get_my_routerinfo() twice, assuming
5803 that the second call will succeed if the first one did. Fixes bug
5804 26269; bugfix on 0.2.8.2-alpha.
5805 - Refrain from compiling unit testing related object files when
5806 --disable-unittests is set to configure script. Fixes bug 24891;
5807 bugfix on 0.2.5.1-alpha.
5808 - The --enable-fatal-warnings flag now affects Rust code as well.
5809 Closes ticket 26245.
5810 - Avoid a compiler warning when casting the return value of
5811 smartlist_len() to double with DEBUG_SMARTLIST enabled. Fixes bug
5812 26283; bugfix on 0.2.4.10-alpha.
5814 o Minor bugfixes (compilation, windows):
5815 - Don't link or search for pthreads when building for Windows, even
5816 if we are using build environment (like mingw) that provides a
5817 pthreads library. Fixes bug 27081; bugfix on 0.1.0.1-rc.
5819 o Minor bugfixes (continuous integration):
5820 - Build with zstd on macOS. Fixes bug 27090; bugfix on 0.3.1.5-alpha.
5821 - Skip a pair of unreliable key generation tests on Windows, until
5822 the underlying issue in bug 26076 is resolved. Fixes bug 26830 and
5823 bug 26853; bugfix on 0.2.7.3-rc and 0.3.2.1-alpha respectively.
5825 o Minor bugfixes (control port):
5826 - Respond with more human-readable error messages to GETINFO exit-
5827 policy/* requests. Also, let controller know if an error is
5828 transient (response code 551) or not (response code 552). Fixes
5829 bug 25852; bugfix on 0.2.8.1-alpha.
5830 - Parse the "HSADDRESS=" parameter in HSPOST commands properly.
5831 Previously, it was misparsed and ignored. Fixes bug 26523; bugfix
5832 on 0.3.3.1-alpha. Patch by "akwizgran".
5833 - Make CIRC_BW event reflect the total of all data sent on a
5834 circuit, including padding and dropped cells. Also fix a mis-
5835 counting bug when STREAM_BW events were enabled. Fixes bug 25400;
5836 bugfix on 0.2.5.2-alpha.
5838 o Minor bugfixes (correctness, flow control):
5839 - Upon receiving a stream-level SENDME cell, verify that our window
5840 has not grown too large. Fixes bug 26214; bugfix on svn
5843 o Minor bugfixes (directory authority):
5844 - When voting for recommended versions, make sure that all of the
5845 versions are well-formed and parsable. Fixes bug 26485; bugfix
5848 o Minor bugfixes (directory client):
5849 - When unverified-consensus is verified, rename it to cached-
5850 consenus. Fixes bug 4187; bugfix on 0.2.0.3-alpha.
5851 - Fixed launching a certificate fetch always during the scheduled
5852 periodic consensus fetch by fetching only in those cases when
5853 consensus are waiting for certs. Fixes bug 24740; bugfix
5856 o Minor bugfixes (error reporting):
5857 - Improve tolerance for directory authorities with skewed clocks.
5858 Previously, an authority with a clock more than 60 seconds ahead
5859 could cause a client with a correct clock to warn that the
5860 client's clock was behind. Now the clocks of a majority of
5861 directory authorities have to be ahead of the client before this
5862 warning will occur. Fixes bug 25756; bugfix on 0.2.2.25-alpha.
5864 o Minor bugfixes (in-process restart):
5865 - Always call tor_free_all() when leaving tor_run_main(). When we
5866 did not, restarting tor in-process would cause an assertion
5867 failure. Fixes bug 26948; bugfix on 0.3.3.1-alpha.
5869 o Minor bugfixes (Linux seccomp2 sandbox):
5870 - Fix a bug in our sandboxing rules for the openat() syscall.
5871 Previously, no openat() call would be permitted, which would break
5872 filesystem operations on recent glibc versions. Fixes bug 25440;
5873 bugfix on 0.2.9.15. Diagnosis and patch from Daniel Pinto.
5875 o Minor bugfixes (logging):
5876 - Improve the log message when connection initiators fail to
5877 authenticate direct connections to relays. Fixes bug 26927; bugfix
5880 o Minor bugfixes (onion services):
5881 - Silence a spurious compiler warning in
5882 rend_client_send_introduction(). Fixes bug 27463; bugfix
5884 - Fix bug that causes services to not ever rotate their descriptors
5885 if they were getting SIGHUPed often. Fixes bug 26932; bugfix
5887 - Recompute some consensus information after detecting a clock jump,
5888 or after transitioning from a non-live consensus to a live
5889 consensus. We do this to avoid having an outdated state, and
5890 miscalculating the index for next-generation onion services. Fixes
5891 bug 24977; bugfix on 0.3.2.1-alpha.
5893 o Minor bugfixes (portability):
5894 - Fix compilation of the unit tests on GNU/Hurd, which does not
5895 define PATH_MAX. Fixes bug 26873; bugfix on 0.3.3.1-alpha. Patch
5897 - Work around two different bugs in the OS X 10.10 and later SDKs
5898 that would prevent us from successfully targeting earlier versions
5899 of OS X. Fixes bug 26876; bugfix on 0.3.3.1-alpha.
5900 - Do not align mmap length, as it is not required by POSIX, and the
5901 getpagesize function is deprecated. Fixes bug 25399; bugfix
5904 o Minor bugfixes (portability, FreeBSD):
5905 - In have_enough_mem_for_dircache(), the variable DIRCACHE_MIN_MEM_MB
5906 does not stringify on FreeBSD, so we switch to tor_asprintf().
5907 Fixes bug 20887; bugfix on 0.2.8.1-alpha. Patch by Neel Chauhan.
5909 o Minor bugfixes (relay statistics):
5910 - When a relay is collecting internal statistics about how many
5911 create cell requests it has seen of each type, accurately count
5912 the requests from relays that temporarily fall out of the
5913 consensus. (To be extra conservative, we were already ignoring
5914 requests from clients in our counts, and we continue ignoring them
5915 here.) Fixes bug 24910; bugfix on 0.2.4.17-rc.
5917 o Minor bugfixes (rust):
5918 - Backport test_rust.sh from master. Fixes bug 26497; bugfix
5920 - Protover parsing was accepting the presence of whitespace in
5921 version strings, which the C implementation would choke on, e.g.
5922 "Desc=1\t,2". Fixes bug 27177; bugfix on 0.3.3.5-rc.
5923 - Protover parsing was ignoring a 2nd hyphen and everything after
5924 it, accepting entries like "Link=1-5-foo". Fixes bug 27164; bugfix
5926 - Stop setting $CARGO_HOME. cargo will use the user's $CARGO_HOME, or
5927 $HOME/.cargo by default. Fixes bug 26497; bugfix on 0.3.1.5-alpha.
5928 - cd to ${abs_top_builddir}/src/rust before running cargo in
5929 src/test/test_rust.sh. This makes the working directory consistent
5930 between builds and tests. Fixes bug 26497; bugfix on 0.3.3.2-alpha.
5932 o Minor bugfixes (single onion services, Tor2web):
5933 - Log a protocol warning when single onion services or Tor2web
5934 clients fail to authenticate direct connections to relays. Fixes
5935 bug 26924; bugfix on 0.2.9.1-alpha.
5937 o Minor bugfixes (test coverage tools):
5938 - Update our "cov-diff" script to handle output from the latest
5939 version of gcov, and to remove extraneous timestamp information
5940 from its output. Fixes bugs 26101 and 26102; bugfix
5943 o Minor bugfixes (testing):
5944 - Disable core dumps in test_bt.sh, to avoid failures in "make
5945 distcheck". Fixes bug 26787; bugfix on 0.2.5.2-alpha.
5946 - When testing workqueue event-cancellation, make sure that we
5947 actually cancel an event, and that cancel each event with equal
5948 probability. (It was previously possible, though extremely
5949 unlikely, for our event-canceling test not to cancel any events.)
5950 Fixes bug 26008; bugfix on 0.2.6.3-alpha.
5951 - Repeat part of the test in test_client_pick_intro() a number of
5952 times, to give it consistent coverage. Fixes bug 25996; bugfix
5954 - Remove randomness from the hs_common/responsible_hsdirs test, so
5955 that it always takes the same path through the function it tests.
5956 Fixes bug 25997; bugfix on 0.3.2.1-alpha.
5957 - Change the behavior of the "channel/outbound" test so that it
5958 never causes a 10-second rollover for the EWMA circuitmux code.
5959 Previously, this behavior would happen randomly, and result in
5960 fluctuating test coverage. Fixes bug 25994; bugfix
5962 - Use X509_new() to allocate certificates that will be freed later
5963 with X509_free(). Previously, some parts of the unit tests had
5964 used tor_malloc_zero(), which is incorrect, and which caused test
5965 failures on Windows when they were built with extra hardening.
5966 Fixes bugs 25943 and 25944; bugfix on 0.2.8.1-alpha. Patch by
5968 - While running the circuit_timeout test, fix the PRNG to a
5969 deterministic AES stream, so that the test coverage from this test
5970 will itself be deterministic. Fixes bug 25995; bugfix
5973 o Minor bugfixes (testing, bootstrap):
5974 - When calculating bootstrap progress, check exit policies and the
5975 exit flag. Previously, Tor would only check the exit flag, which
5976 caused race conditions in small and fast networks like chutney.
5977 Fixes bug 27236; bugfix on 0.2.6.3-alpha.
5979 o Minor bugfixes (testing, chutney):
5980 - When running make test-network-all, use the mixed+hs-v2 network.
5981 (A previous fix to chutney removed v3 onion services from the
5982 mixed+hs-v23 network, so seeing "mixed+hs-v23" in tests is
5983 confusing.) Fixes bug 27345; bugfix on 0.3.2.1-alpha.
5984 - Before running make test-network-all, delete old logs and test
5985 result files, to avoid spurious failures. Fixes bug 27295; bugfix
5988 o Minor bugfixes (testing, openssl compatibility):
5989 - Our "tortls/cert_matches_key" unit test no longer relies on
5990 OpenSSL internals. Previously, it relied on unsupported OpenSSL
5991 behavior in a way that caused it to crash with OpenSSL 1.0.2p.
5992 Fixes bug 27226; bugfix on 0.2.5.1-alpha.
5994 o Minor bugfixes (v3 onion services):
5995 - Stop sending ed25519 link specifiers in v3 onion service introduce
5996 cells and descriptors, when the rendezvous or introduction point
5997 doesn't support ed25519 link authentication. Fixes bug 26627;
5998 bugfix on 0.3.2.4-alpha.
6000 o Minor bugfixes (vanguards):
6001 - Allow the last hop in a vanguard circuit to be the same as our
6002 first, to prevent the adversary from influencing guard node choice
6003 by choice of last hop. Also prevent the creation of A - B - A
6004 paths, or A - A paths, which are forbidden by relays. Fixes bug
6005 25870; bugfix on 0.3.3.1-alpha.
6007 o Minor bugfixes (Windows, compilation):
6008 - Silence a compilation warning on MSVC 2017 and clang-cl. Fixes bug
6009 27185; bugfix on 0.2.2.2-alpha.
6011 o Code simplification and refactoring:
6012 - Remove duplicate code in parse_{c,s}method_line and bootstrap
6013 their functionalities into a single function. Fixes bug 6236;
6014 bugfix on 0.2.3.6-alpha.
6015 - We remove the PortForwarding and PortForwardingHelper options,
6016 related functions, and the port_forwarding tests. These options
6017 were used by the now-deprecated Vidalia to help ordinary users
6018 become Tor relays or bridges. Closes ticket 25409. Patch by
6020 - In order to make the OR and dir checking function in router.c less
6021 confusing we renamed some functions and
6022 consider_testing_reachability() has been split into
6023 router_should_check_reachability() and
6024 router_do_reachability_checks(). Also we improved the documentation
6025 in some functions. Closes ticket 18918.
6026 - Initial work to isolate Libevent usage to a handful of modules in
6027 our codebase, to simplify our call structure, and so that we can
6028 more easily change event loops in the future if needed. Closes
6030 - Introduce a function to call getsockname() and return tor_addr_t,
6031 to save a little complexity throughout the codebase. Closes
6033 - Make hsdir_index in node_t a hsdir_index_t rather than a pointer
6034 as hsdir_index is always present. Also, we move hsdir_index_t into
6035 or.h. Closes ticket 23094. Patch by Neel Chauhan.
6036 - Merge functions used for describing nodes and suppress the
6037 functions that do not allocate memory for the output buffer
6038 string. NODE_DESC_BUF_LEN constant and format_node_description()
6039 function cannot be used externally from router.c module anymore.
6040 Closes ticket 25432. Patch by valentecaio.
6041 - Our main loop has been simplified so that all important operations
6042 happen inside events. Previously, some operations had to happen
6043 outside the event loop, to prevent infinite sequences of event
6044 activations. Closes ticket 25374.
6045 - Put a SHA1 public key digest in hs_service_intro_point_t, and use
6046 it in register_intro_circ() and service_intro_point_new(). This
6047 prevents the digest from being re-calculated each time. Closes
6048 ticket 23107. Patch by Neel Chauhan.
6049 - Refactor token-bucket implementations to use a common backend.
6050 Closes ticket 25766.
6051 - Remove extern declaration of stats_n_seconds_working variable from
6052 main, protecting its accesses with get_uptime() and reset_uptime()
6053 functions. Closes ticket 25081, patch by “valentecaio”.
6054 - Remove our previous logic for "cached gettimeofday()" -- our
6055 coarse monotonic timers are fast enough for this purpose, and far
6056 less error-prone. Implements part of ticket 25927.
6057 - Remove the return value for fascist_firewall_choose_address_base(),
6058 and sister functions such as fascist_firewall_choose_address_node()
6059 and fascist_firewall_choose_address_rs(). Also, while we're here,
6060 initialize the ap argument as leaving it uninitialized can pose a
6061 security hazard. Closes ticket 24734. Patch by Neel Chauhan.
6062 - Rename two fields of connection_t struct. timestamp_lastwritten is
6063 renamed to timestamp_last_write_allowed and timestamp_lastread is
6064 renamed to timestamp_last_read_allowed. Closes ticket 24714, patch
6066 - Since Tor requires C99, remove our old workaround code for libc
6067 implementations where free(NULL) doesn't work. Closes ticket 24484.
6068 - Use our standard rate-limiting code to deal with excessive
6069 libevent failures, rather than the hand-rolled logic we had
6070 before. Closes ticket 26016.
6071 - We remove the return value of node_get_prim_orport() and
6072 node_get_prim_dirport(), and introduce node_get_prim_orport() in
6073 node_ipv6_or_preferred() and node_ipv6_dir_preferred() in order to
6074 check for a null address. Closes ticket 23873. Patch by
6076 - We switch to should_record_bridge_info() in
6077 geoip_note_client_seen() and options_need_geoip_info() instead of
6078 accessing the configuration values directly. Fixes bug 25290;
6079 bugfix on 0.2.1.6-alpha. Patch by Neel Chauhan.
6081 o Deprecated features:
6082 - As we are not recommending 0.2.5 anymore, we require relays that
6083 once had an ed25519 key associated with their RSA key to always
6084 have that key, instead of allowing them to drop back to a version
6085 that didn't support ed25519. This means they need to use a new RSA
6086 key if they want to downgrade to an older version of tor without
6087 ed25519. Closes ticket 20522.
6090 - Directory authorities will no longer support voting according to
6091 any consensus method before consensus method 25. This keeps
6092 authorities compatible with all authorities running 0.2.9.8 and
6093 later, and does not break any clients or relays. Implements ticket
6094 24378 and proposal 290.
6095 - The PortForwarding and PortForwardingHelper features have been
6096 removed. The reasoning is, given that implementations of NAT
6097 traversal protocols within common consumer grade routers are
6098 frequently buggy, and that the target audience for a NAT punching
6099 feature is a perhaps less-technically-inclined relay operator,
6100 when the helper fails to setup traversal the problems are usually
6101 deep, ugly, and very router specific, making them horrendously
6102 impossible for technical support to reliable assist with, and thus
6103 resulting in frustration all around. Unfortunately, relay
6104 operators who would like to run relays behind NATs will need to
6105 become more familiar with the port forwarding configurations on
6106 their local router. Closes 25409.
6107 - The TestingEnableTbEmptyEvent option has been removed. It was used
6108 in testing simulations to measure how often connection buckets
6109 were emptied, in order to improve our scheduling, but it has not
6110 been actively used in years. Closes ticket 25760.
6111 - The old "round-robin" circuit multiplexer (circuitmux)
6112 implementation has been removed, along with a fairly large set of
6113 code that existed to support it. It has not been the default
6114 circuitmux since we introduced the "EWMA" circuitmux in 0.2.4.x,
6115 but it still required an unreasonable amount of memory and CPU.
6116 Closes ticket 25268.
6119 Changes in version 0.3.3.9 - 2018-07-13
6120 Tor 0.3.3.9 moves to a new bridge authority, meaning people running
6121 bridge relays should upgrade.
6123 o Directory authority changes:
6124 - The "Bifroest" bridge authority has been retired; the new bridge
6125 authority is "Serge", and it is operated by George from the
6126 TorBSD project. Closes ticket 26771.
6129 Changes in version 0.3.2.11 - 2018-07-13
6130 Tor 0.3.2.11 moves to a new bridge authority, meaning people running
6131 bridge relays should upgrade. We also take this opportunity to backport
6134 o Directory authority changes:
6135 - The "Bifroest" bridge authority has been retired; the new bridge
6136 authority is "Serge", and it is operated by George from the
6137 TorBSD project. Closes ticket 26771.
6139 o Directory authority changes (backport from 0.3.3.7):
6140 - Add an IPv6 address for the "dannenberg" directory authority.
6141 Closes ticket 26343.
6143 o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
6144 - When directory authorities read a zero-byte bandwidth file, they
6145 would previously log a warning with the contents of an
6146 uninitialised buffer. They now log a warning about the empty file
6147 instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
6149 o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
6150 - Correctly detect when onion services get disabled after HUP. Fixes
6151 bug 25761; bugfix on 0.3.2.1.
6153 o Minor features (sandbox, backport from 0.3.3.4-alpha):
6154 - Explicitly permit the poll() system call when the Linux
6155 seccomp2-based sandbox is enabled: apparently, some versions of
6156 libc use poll() when calling getpwnam(). Closes ticket 25313.
6158 o Minor feature (continuous integration, backport from 0.3.3.5-rc):
6159 - Update the Travis CI configuration to use the stable Rust channel,
6160 now that we have decided to require that. Closes ticket 25714.
6162 o Minor features (continuous integration, backport from 0.3.4.1-alpha):
6163 - Our .travis.yml configuration now includes support for testing the
6164 results of "make distcheck". (It's not uncommon for "make check"
6165 to pass but "make distcheck" to fail.) Closes ticket 25814.
6166 - Our Travis CI configuration now integrates with the Coveralls
6167 coverage analysis tool. Closes ticket 25818.
6169 o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
6170 - Add several checks to detect whether Tor relays are uploading
6171 their descriptors without specifying why they regenerated them.
6172 Diagnostic for ticket 25686.
6174 o Minor features (compilation, backport from 0.3.4.4-rc):
6175 - When building Tor, prefer to use Python 3 over Python 2, and more
6176 recent (contemplated) versions over older ones. Closes
6179 o Minor features (geoip):
6180 - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
6181 Country database. Closes ticket 26674.
6183 o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
6184 - Upon receiving a malformed connected cell, stop processing the
6185 cell immediately. Previously we would mark the connection for
6186 close, but continue processing the cell as if the connection were
6187 open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
6189 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
6190 - Allow the nanosleep() system call, which glibc uses to implement
6191 sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
6193 o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
6194 - When running the hs_ntor_ref.py test, make sure only to pass
6195 strings (rather than "bytes" objects) to the Python subprocess
6196 module. Python 3 on Windows seems to require this. Fixes bug
6197 26535; bugfix on 0.3.1.1-alpha.
6198 - When running the ntor_ref.py test, make sure only to pass strings
6199 (rather than "bytes" objects) to the Python subprocess module.
6200 Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
6203 o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
6204 - Work around a change in OpenSSL 1.1.1 where return values that
6205 would previously indicate "no password" now indicate an empty
6206 password. Without this workaround, Tor instances running with
6207 OpenSSL 1.1.1 would accept descriptors that other Tor instances
6208 would reject. Fixes bug 26116; bugfix on 0.2.5.16.
6210 o Minor bugfixes (documentation, backport from 0.3.3.5-rc):
6211 - Document that the PerConnBW{Rate,Burst} options will fall back to
6212 their corresponding consensus parameters only if those parameters
6213 are set. Previously we had claimed that these values would always
6214 be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
6216 o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
6217 - Fix a compilation warning on some versions of GCC when building
6218 code that calls routerinfo_get_my_routerinfo() twice, assuming
6219 that the second call will succeed if the first one did. Fixes bug
6220 26269; bugfix on 0.2.8.2-alpha.
6222 o Minor bugfixes (client, backport from 0.3.4.1-alpha):
6223 - Don't consider Tor running as a client if the ControlPort is open,
6224 but no actual client ports are open. Fixes bug 26062; bugfix
6227 o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
6228 - Prevent a possible out-of-bounds smartlist read in
6229 protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
6231 o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
6232 - Fix a very unlikely (impossible, we believe) null pointer
6233 dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
6234 Coverity; this is CID 1430932.
6236 o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
6237 - Fix a memory leak when a v3 onion service is configured and gets a
6238 SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
6239 - When parsing the descriptor signature, look for the token plus an
6240 extra white-space at the end. This is more correct but also will
6241 allow us to support new fields that might start with "signature".
6242 Fixes bug 26069; bugfix on 0.3.0.1-alpha.
6244 o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
6245 - Relays now correctly block attempts to re-extend to the previous
6246 relay by Ed25519 identity. Previously they would warn in this
6247 case, but not actually reject the attempt. Fixes bug 26158; bugfix
6250 o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
6251 - Avoid a crash when running with DirPort set but ORPort turned off.
6252 Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
6254 o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
6255 - Silence unused-const-variable warnings in zstd.h with some GCC
6256 versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
6258 o Minor bugfixes (testing, backport from 0.3.3.4-alpha):
6259 - Avoid intermittent test failures due to a test that had relied on
6260 onion service introduction point creation finishing within 5
6261 seconds of real clock time. Fixes bug 25450; bugfix
6264 o Minor bugfixes (compilation, backport from 0.3.3.4-alpha):
6265 - Fix a C99 compliance issue in our configuration script that caused
6266 compilation issues when compiling Tor with certain versions of
6267 xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
6269 o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
6270 - Fix a number of small memory leaks identified by coverity. Fixes
6271 bug 26467; bugfix on numerous Tor versions.
6273 o Code simplification and refactoring (backport from 0.3.3.5-rc):
6274 - Move the list of default directory authorities to its own file.
6275 Closes ticket 24854. Patch by "beastr0".
6278 Changes in version 0.2.9.16 - 2018-07-13
6279 Tor 0.2.9.16 moves to a new bridge authority, meaning people running
6280 bridge relays should upgrade. We also take this opportunity to backport
6283 o Directory authority changes:
6284 - The "Bifroest" bridge authority has been retired; the new bridge
6285 authority is "Serge", and it is operated by George from the
6286 TorBSD project. Closes ticket 26771.
6288 o Directory authority changes (backport from 0.3.3.7):
6289 - Add an IPv6 address for the "dannenberg" directory authority.
6290 Closes ticket 26343.
6292 o Major bugfixes (directory authorities, backport from 0.3.4.1-alpha):
6293 - When directory authorities read a zero-byte bandwidth file, they
6294 would previously log a warning with the contents of an
6295 uninitialised buffer. They now log a warning about the empty file
6296 instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
6298 o Minor features (sandbox, backport from 0.3.3.4-alpha):
6299 - Explicitly permit the poll() system call when the Linux
6300 seccomp2-based sandbox is enabled: apparently, some versions of
6301 libc use poll() when calling getpwnam(). Closes ticket 25313.
6303 o Minor features (continuous integration, backport from 0.3.4.1-alpha):
6304 - Our .travis.yml configuration now includes support for testing the
6305 results of "make distcheck". (It's not uncommon for "make check"
6306 to pass but "make distcheck" to fail.) Closes ticket 25814.
6307 - Our Travis CI configuration now integrates with the Coveralls
6308 coverage analysis tool. Closes ticket 25818.
6310 o Minor features (compilation, backport from 0.3.4.4-rc):
6311 - When building Tor, prefer to use Python 3 over Python 2, and more
6312 recent (contemplated) versions over older ones. Closes
6315 o Minor features (geoip):
6316 - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
6317 Country database. Closes ticket 26674.
6319 o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
6320 - Upon receiving a malformed connected cell, stop processing the
6321 cell immediately. Previously we would mark the connection for
6322 close, but continue processing the cell as if the connection were
6323 open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
6325 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
6326 - Allow the nanosleep() system call, which glibc uses to implement
6327 sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
6329 o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
6330 - When running the ntor_ref.py test, make sure only to pass strings
6331 (rather than "bytes" objects) to the Python subprocess module.
6332 Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
6335 o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
6336 - Work around a change in OpenSSL 1.1.1 where return values that
6337 would previously indicate "no password" now indicate an empty
6338 password. Without this workaround, Tor instances running with
6339 OpenSSL 1.1.1 would accept descriptors that other Tor instances
6340 would reject. Fixes bug 26116; bugfix on 0.2.5.16.
6342 o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
6343 - Fix a compilation warning on some versions of GCC when building
6344 code that calls routerinfo_get_my_routerinfo() twice, assuming
6345 that the second call will succeed if the first one did. Fixes bug
6346 26269; bugfix on 0.2.8.2-alpha.
6348 o Minor bugfixes (client, backport from 0.3.4.1-alpha):
6349 - Don't consider Tor running as a client if the ControlPort is open,
6350 but no actual client ports are open. Fixes bug 26062; bugfix
6353 o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
6354 - Prevent a possible out-of-bounds smartlist read in
6355 protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
6357 o Minor bugfixes (C correctness, backport from 0.3.3.4-alpha):
6358 - Fix a very unlikely (impossible, we believe) null pointer
6359 dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
6360 Coverity; this is CID 1430932.
6362 o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
6363 - Fix a number of small memory leaks identified by coverity. Fixes
6364 bug 26467; bugfix on numerous Tor versions.
6366 o Code simplification and refactoring (backport from 0.3.3.5-rc):
6367 - Move the list of default directory authorities to its own file.
6368 Closes ticket 24854. Patch by "beastr0".
6371 Changes in version 0.3.3.8 - 2018-07-09
6372 Tor 0.3.3.8 backports several changes from the 0.3.4.x series, including
6373 fixes for a memory leak affecting directory authorities.
6375 o Major bugfixes (directory authority, backport from 0.3.4.3-alpha):
6376 - Stop leaking memory on directory authorities when planning to
6377 vote. This bug was crashing authorities by exhausting their
6378 memory. Fixes bug 26435; bugfix on 0.3.3.6.
6380 o Major bugfixes (rust, testing, backport from 0.3.4.3-alpha):
6381 - Make sure that failing tests in Rust will actually cause the build
6382 to fail: previously, they were ignored. Fixes bug 26258; bugfix
6385 o Minor features (compilation, backport from 0.3.4.4-rc):
6386 - When building Tor, prefer to use Python 3 over Python 2, and more
6387 recent (contemplated) versions over older ones. Closes
6390 o Minor features (geoip):
6391 - Update geoip and geoip6 to the July 3 2018 Maxmind GeoLite2
6392 Country database. Closes ticket 26674.
6394 o Minor features (relay, diagnostic, backport from 0.3.4.3-alpha):
6395 - Add several checks to detect whether Tor relays are uploading
6396 their descriptors without specifying why they regenerated them.
6397 Diagnostic for ticket 25686.
6399 o Minor bugfixes (circuit path selection, backport from 0.3.4.1-alpha):
6400 - Don't count path selection failures as circuit build failures.
6401 This change should eliminate cases where Tor blames its guard or
6402 the network for situations like insufficient microdescriptors
6403 and/or overly restrictive torrc settings. Fixes bug 25705; bugfix
6406 o Minor bugfixes (compilation, backport from 0.3.4.4-rc):
6407 - Fix a compilation warning on some versions of GCC when building
6408 code that calls routerinfo_get_my_routerinfo() twice, assuming
6409 that the second call will succeed if the first one did. Fixes bug
6410 26269; bugfix on 0.2.8.2-alpha.
6412 o Minor bugfixes (control port, backport from 0.3.4.4-rc):
6413 - Handle the HSADDRESS= argument to the HSPOST command properly.
6414 (Previously, this argument was misparsed and thus ignored.) Fixes
6415 bug 26523; bugfix on 0.3.3.1-alpha. Patch by "akwizgran".
6417 o Minor bugfixes (memory, correctness, backport from 0.3.4.4-rc):
6418 - Fix a number of small memory leaks identified by coverity. Fixes
6419 bug 26467; bugfix on numerous Tor versions.
6421 o Minor bugfixes (relay, backport from 0.3.4.3-alpha):
6422 - Relays now correctly block attempts to re-extend to the previous
6423 relay by Ed25519 identity. Previously they would warn in this
6424 case, but not actually reject the attempt. Fixes bug 26158; bugfix
6427 o Minor bugfixes (restart-in-process, backport from 0.3.4.1-alpha):
6428 - When shutting down, Tor now clears all the flags in the control.c
6429 module. This should prevent a bug where authentication cookies are
6430 not generated on restart. Fixes bug 25512; bugfix on 0.3.3.1-alpha.
6432 o Minor bugfixes (testing, compatibility, backport from 0.3.4.4-rc):
6433 - When running the hs_ntor_ref.py test, make sure only to pass
6434 strings (rather than "bytes" objects) to the Python subprocess
6435 module. Python 3 on Windows seems to require this. Fixes bug
6436 26535; bugfix on 0.3.1.1-alpha.
6437 - When running the ntor_ref.py test, make sure only to pass strings
6438 (rather than "bytes" objects) to the Python subprocess module.
6439 Python 3 on Windows seems to require this. Fixes bug 26535; bugfix
6443 Changes in version 0.3.3.7 - 2018-06-12
6444 Tor 0.3.3.7 backports several changes from the 0.3.4.x series, including
6445 fixes for bugs affecting compatibility and stability.
6447 o Directory authority changes:
6448 - Add an IPv6 address for the "dannenberg" directory authority.
6449 Closes ticket 26343.
6451 o Minor features (geoip):
6452 - Update geoip and geoip6 to the June 7 2018 Maxmind GeoLite2
6453 Country database. Closes ticket 26351.
6455 o Minor bugfixes (compatibility, openssl, backport from 0.3.4.2-alpha):
6456 - Work around a change in OpenSSL 1.1.1 where return values that
6457 would previously indicate "no password" now indicate an empty
6458 password. Without this workaround, Tor instances running with
6459 OpenSSL 1.1.1 would accept descriptors that other Tor instances
6460 would reject. Fixes bug 26116; bugfix on 0.2.5.16.
6462 o Minor bugfixes (compilation, backport from 0.3.4.2-alpha):
6463 - Silence unused-const-variable warnings in zstd.h with some GCC
6464 versions. Fixes bug 26272; bugfix on 0.3.1.1-alpha.
6466 o Minor bugfixes (controller, backport from 0.3.4.2-alpha):
6467 - Improve accuracy of the BUILDTIMEOUT_SET control port event's
6468 TIMEOUT_RATE and CLOSE_RATE fields. (We were previously
6469 miscounting the total number of circuits for these field values.)
6470 Fixes bug 26121; bugfix on 0.3.3.1-alpha.
6472 o Minor bugfixes (hardening, backport from 0.3.4.2-alpha):
6473 - Prevent a possible out-of-bounds smartlist read in
6474 protover_compute_vote(). Fixes bug 26196; bugfix on 0.2.9.4-alpha.
6476 o Minor bugfixes (path selection, backport from 0.3.4.1-alpha):
6477 - Only select relays when they have the descriptors we prefer to use
6478 for them. This change fixes a bug where we could select a relay
6479 because it had _some_ descriptor, but reject it later with a
6480 nonfatal assertion error because it didn't have the exact one we
6481 wanted. Fixes bugs 25691 and 25692; bugfix on 0.3.3.4-alpha.
6484 Changes in version 0.3.3.6 - 2018-05-22
6485 Tor 0.3.3.6 is the first stable release in the 0.3.3 series. It
6486 backports several important fixes from the 0.3.4.1-alpha.
6488 The Tor 0.3.3 series includes controller support and other
6489 improvements for v3 onion services, official support for embedding Tor
6490 within other applications, and our first non-trivial module written in
6491 the Rust programming language. (Rust is still not enabled by default
6492 when building Tor.) And as usual, there are numerous other smaller
6493 bugfixes, features, and improvements.
6495 Below are the changes since 0.3.2.10. For a list of only the changes
6496 since 0.3.3.5-rc, see the ChangeLog file.
6498 o New system requirements:
6499 - When built with Rust, Tor now depends on version 0.2.39 of the
6500 libc crate. Closes tickets 25310 and 25664.
6502 o Major features (embedding):
6503 - There is now a documented stable API for programs that need to
6504 embed Tor. See tor_api.h for full documentation and known bugs.
6505 Closes ticket 23684.
6506 - Tor now has support for restarting in the same process.
6507 Controllers that run Tor using the "tor_api.h" interface can now
6508 restart Tor after Tor has exited. This support is incomplete,
6509 however: we fixed crash bugs that prevented it from working at
6510 all, but many bugs probably remain, including a possibility of
6511 security issues. Implements ticket 24581.
6513 o Major features (IPv6, directory documents):
6514 - Add consensus method 27, which adds IPv6 ORPorts to the microdesc
6515 consensus. This information makes it easier for IPv6 clients to
6516 bootstrap and choose reachable entry guards. Implements
6518 - Add consensus method 28, which removes IPv6 ORPorts from
6519 microdescriptors. Now that the consensus contains IPv6 ORPorts,
6520 they are redundant in microdescs. This change will be used by Tor
6521 clients on 0.2.8.x and later. (That is to say, with all Tor
6522 clients that have IPv6 bootstrap and guard support.) Implements
6524 - Expand the documentation for AuthDirHasIPv6Connectivity when it is
6525 set by different numbers of authorities. Fixes 23870
6528 o Major features (onion service v3, control port):
6529 - The control port now supports commands and events for v3 onion
6530 services. It is now possible to create ephemeral v3 services using
6531 ADD_ONION. Additionally, several events (HS_DESC, HS_DESC_CONTENT,
6532 CIRC and CIRC_MINOR) and commands (GETINFO, HSPOST, ADD_ONION and
6533 DEL_ONION) have been extended to support v3 onion services. Closes
6534 ticket 20699; implements proposal 284.
6536 o Major features (onion services):
6537 - Provide torrc options to pin the second and third hops of onion
6538 service circuits to a list of nodes. The option HSLayer2Guards
6539 pins the second hop, and the option HSLayer3Guards pins the third
6540 hop. These options are for use in conjunction with experiments
6541 with "vanguards" for preventing guard enumeration attacks. Closes
6543 - When v3 onion service clients send introduce cells, they now
6544 include the IPv6 address of the rendezvous point, if it has one.
6545 Current v3 onion services running 0.3.2 ignore IPv6 addresses, but
6546 in future Tor versions, IPv6-only v3 single onion services will be
6547 able to use IPv6 addresses to connect directly to the rendezvous
6548 point. Closes ticket 23577. Patch by Neel Chauhan.
6550 o Major features (relay):
6551 - Implement an option, ReducedExitPolicy, to allow an Tor exit relay
6552 operator to use a more reasonable ("reduced") exit policy, rather
6553 than the default one. If you want to run an exit node without
6554 thinking too hard about which ports to allow, this one is for you.
6555 Closes ticket 13605. Patch from Neel Chauhan.
6557 o Major features (rust, portability, experimental):
6558 - Tor now ships with an optional implementation of one of its
6559 smaller modules (protover.c) in the Rust programming language. To
6560 try it out, install a Rust build environment, and configure Tor
6561 with "--enable-rust --enable-cargo-online-mode". This should not
6562 cause any user-visible changes, but should help us gain more
6563 experience with Rust, and plan future Rust integration work.
6564 Implementation by Chelsea Komlo. Closes ticket 22840.
6566 o Major bugfixes (directory authorities, security, backport from 0.3.4.1-alpha):
6567 - When directory authorities read a zero-byte bandwidth file, they
6568 would previously log a warning with the contents of an
6569 uninitialised buffer. They now log a warning about the empty file
6570 instead. Fixes bug 26007; bugfix on 0.2.2.1-alpha.
6572 o Major bugfixes (security, directory authority, denial-of-service):
6573 - Fix a bug that could have allowed an attacker to force a directory
6574 authority to use up all its RAM by passing it a maliciously
6575 crafted protocol versions string. Fixes bug 25517; bugfix on
6576 0.2.9.4-alpha. This issue is also tracked as TROVE-2018-005.
6578 o Major bugfixes (crash, backport from 0.3.4.1-alpha):
6579 - Avoid a rare assertion failure in the circuit build timeout code
6580 if we fail to allow any circuits to actually complete. Fixes bug
6581 25733; bugfix on 0.2.2.2-alpha.
6583 o Major bugfixes (netflow padding):
6584 - Stop adding unneeded channel padding right after we finish
6585 flushing to a connection that has been trying to flush for many
6586 seconds. Instead, treat all partial or complete flushes as
6587 activity on the channel, which will defer the time until we need
6588 to add padding. This fix should resolve confusing and scary log
6589 messages like "Channel padding timeout scheduled 221453ms in the
6590 past." Fixes bug 22212; bugfix on 0.3.1.1-alpha.
6592 o Major bugfixes (networking):
6593 - Tor will no longer reject IPv6 address strings from Tor Browser
6594 when they are passed as hostnames in SOCKS5 requests. Fixes bug
6595 25036, bugfix on Tor 0.3.1.2.
6597 o Major bugfixes (onion service, backport from 0.3.4.1-alpha):
6598 - Correctly detect when onion services get disabled after HUP. Fixes
6599 bug 25761; bugfix on 0.3.2.1.
6601 o Major bugfixes (performance, load balancing):
6602 - Directory authorities no longer vote in favor of the Guard flag
6603 for relays without directory support. Starting in Tor
6604 0.3.0.1-alpha, clients have been avoiding using such relays in the
6605 Guard position, leading to increasingly broken load balancing for
6606 the 5%-or-so of Guards that don't advertise directory support.
6607 Fixes bug 22310; bugfix on 0.3.0.6.
6609 o Major bugfixes (relay):
6610 - If we have failed to connect to a relay and received a connection
6611 refused, timeout, or similar error (at the TCP level), do not try
6612 that same address/port again for 60 seconds after the failure has
6613 occurred. Fixes bug 24767; bugfix on 0.0.6.
6615 o Major bugfixes (relay, denial of service, backport from 0.3.4.1-alpha):
6616 - Impose a limit on circuit cell queue size. The limit can be
6617 controlled by a consensus parameter. Fixes bug 25226; bugfix
6620 o Minor features (cleanup):
6621 - Tor now deletes the CookieAuthFile and ExtORPortCookieAuthFile
6622 when it stops. Closes ticket 23271.
6624 o Minor features (compatibility, backport from 0.3.4.1-alpha):
6625 - Avoid some compilation warnings with recent versions of LibreSSL.
6626 Closes ticket 26006.
6628 o Minor features (config options):
6629 - Change the way the default value for MaxMemInQueues is calculated.
6630 We now use 40% of the hardware RAM if the system has 8 GB RAM or
6631 more. Otherwise we use the former value of 75%. Closes
6634 o Minor features (continuous integration):
6635 - Update the Travis CI configuration to use the stable Rust channel,
6636 now that we have decided to require that. Closes ticket 25714.
6638 o Minor features (continuous integration, backport from 0.3.4.1-alpha):
6639 - Our .travis.yml configuration now includes support for testing the
6640 results of "make distcheck". (It's not uncommon for "make check"
6641 to pass but "make distcheck" to fail.) Closes ticket 25814.
6642 - Our Travis CI configuration now integrates with the Coveralls
6643 coverage analysis tool. Closes ticket 25818.
6645 o Minor features (defensive programming):
6646 - Most of the functions in Tor that free objects have been replaced
6647 with macros that free the objects and set the corresponding
6648 pointers to NULL. This change should help prevent a large class of
6649 dangling pointer bugs. Closes ticket 24337.
6650 - Where possible, the tor_free() macro now only evaluates its input
6651 once. Part of ticket 24337.
6652 - Check that microdesc ed25519 ids are non-zero in
6653 node_get_ed25519_id() before returning them. Implements ticket
6654 24001, patch by "aruna1234".
6656 o Minor features (directory authority):
6657 - When directory authorities are unable to add signatures to a
6658 pending consensus, log the reason why. Closes ticket 24849.
6660 o Minor features (embedding):
6661 - Tor can now start with a preauthenticated control connection
6662 created by the process that launched it. This feature is meant for
6663 use by programs that want to launch and manage a Tor process
6664 without allowing other programs to manage it as well. For more
6665 information, see the __OwningControllerFD option documented in
6666 control-spec.txt. Closes ticket 23900.
6667 - On most errors that would cause Tor to exit, it now tries to
6668 return from the tor_main() function, rather than calling the
6669 system exit() function. Most users won't notice a difference here,
6670 but it should be significant for programs that run Tor inside a
6671 separate thread: they should now be able to survive Tor's exit
6672 conditions rather than having Tor shut down the entire process.
6673 Closes ticket 23848.
6674 - Applications that want to embed Tor can now tell Tor not to
6675 register any of its own POSIX signal handlers, using the
6676 __DisableSignalHandlers option. Closes ticket 24588.
6678 o Minor features (fallback directory list):
6679 - Avoid selecting fallbacks that change their IP addresses too
6680 often. Select more fallbacks by ignoring the Guard flag, and
6681 allowing lower cutoffs for the Running and V2Dir flags. Also allow
6682 a lower bandwidth, and a higher number of fallbacks per operator
6683 (5% of the list). Implements ticket 24785.
6684 - Update the fallback whitelist and blacklist based on opt-ins and
6685 relay changes. Closes tickets 22321, 24678, 22527, 24135,
6688 o Minor features (fallback directory mirror configuration):
6689 - Add a nickname to each fallback in a C comment. This makes it
6690 easier for operators to find their relays, and allows stem to use
6691 nicknames to identify fallbacks. Implements ticket 24600.
6692 - Add a type and version header to the fallback directory mirror
6693 file. Also add a delimiter to the end of each fallback entry. This
6694 helps external parsers like stem and Relay Search. Implements
6696 - Add an extrainfo cache flag for each fallback in a C comment. This
6697 allows stem to use fallbacks to fetch extra-info documents, rather
6698 than using authorities. Implements ticket 22759.
6699 - Add the generateFallbackDirLine.py script for automatically
6700 generating fallback directory mirror lines from relay fingerprints.
6701 No more typos! Add the lookupFallbackDirContact.py script for
6702 automatically looking up operator contact info from relay
6703 fingerprints. Implements ticket 24706, patch by teor and atagar.
6704 - Reject any fallback directory mirror that serves an expired
6705 consensus. Implements ticket 20942, patch by "minik".
6706 - Remove commas and equals signs from external string inputs to the
6707 fallback list. This avoids format confusion attacks. Implements
6709 - Remove the "weight=10" line from fallback directory mirror
6710 entries. Ticket 24681 will maintain the current fallback weights
6711 by changing Tor's default fallback weight to 10. Implements
6713 - Stop logging excessive information about fallback netblocks.
6714 Implements ticket 24791.
6716 o Minor features (forward-compatibility):
6717 - If a relay supports some link authentication protocol that we do
6718 not recognize, then include that relay's ed25519 key when telling
6719 other relays to extend to it. Previously, we treated future
6720 versions as if they were too old to support ed25519 link
6721 authentication. Closes ticket 20895.
6723 o Minor features (geoip):
6724 - Update geoip and geoip6 to the May 1 2018 Maxmind GeoLite2 Country
6725 database. Closes ticket 26104.
6727 o Minor features (heartbeat):
6728 - Add onion service information to our heartbeat logs, displaying
6729 stats about the activity of configured onion services. Closes
6732 o Minor features (instrumentation, development):
6733 - Add the MainloopStats option to allow developers to get
6734 instrumentation information from the main event loop via the
6735 heartbeat messages. We hope to use this to improve Tor's behavior
6736 when it's trying to sleep. Closes ticket 24605.
6738 o Minor features (IPv6):
6739 - Make IPv6-only clients wait for microdescs for relays, even if we
6740 were previously using descriptors (or were using them as a bridge)
6741 and have a cached descriptor for them. Implements ticket 23827.
6742 - When a consensus has IPv6 ORPorts, make IPv6-only clients use
6743 them, rather than waiting to download microdescriptors. Implements
6746 o Minor features (log messages):
6747 - Improve log message in the out-of-memory handler to include
6748 information about memory usage from the different compression
6749 backends. Closes ticket 25372.
6750 - Improve a warning message that happens when we fail to re-parse an
6751 old router because of an expired certificate. Closes ticket 20020.
6752 - Make the log more quantitative when we hit MaxMemInQueues
6753 threshold exposing some values. Closes ticket 24501.
6755 o Minor features (logging):
6756 - Clarify the log messages produced when getrandom() or a related
6757 entropy-generation mechanism gives an error. Closes ticket 25120.
6758 - Added support for the Android logging subsystem. Closes
6761 o Minor features (performance):
6762 - Support predictive circuit building for onion service circuits
6763 with multiple layers of guards. Closes ticket 23101.
6764 - Use stdatomic.h where available, rather than mutexes, to implement
6765 atomic_counter_t. Closes ticket 23953.
6767 o Minor features (performance, 32-bit):
6768 - Improve performance on 32-bit systems by avoiding 64-bit division
6769 when calculating the timestamp in milliseconds for channel padding
6770 computations. Implements ticket 24613.
6771 - Improve performance on 32-bit systems by avoiding 64-bit division
6772 when timestamping cells and buffer chunks for OOM calculations.
6773 Implements ticket 24374.
6775 o Minor features (performance, OSX, iOS):
6776 - Use the mach_approximate_time() function (when available) to
6777 implement coarse monotonic time. Having a coarse time function
6778 should avoid a large number of system calls, and improve
6779 performance slightly, especially under load. Closes ticket 24427.
6781 o Minor features (performance, windows):
6782 - Improve performance on Windows Vista and Windows 7 by adjusting
6783 TCP send window size according to the recommendation from
6784 SIO_IDEAL_SEND_BACKLOG_QUERY. Closes ticket 22798. Patch
6787 o Minor features (sandbox):
6788 - Explicitly permit the poll() system call when the Linux
6789 seccomp2-based sandbox is enabled: apparently, some versions of
6790 libc use poll() when calling getpwnam(). Closes ticket 25313.
6792 o Minor features (storage, configuration):
6793 - Users can store cached directory documents somewhere other than
6794 the DataDirectory by using the CacheDirectory option. Similarly,
6795 the storage location for relay's keys can be overridden with the
6796 KeyDirectory option. Closes ticket 22703.
6798 o Minor features (testing):
6799 - Add a "make test-rust" target to run the rust tests only. Closes
6802 o Minor features (testing, debugging, embedding):
6803 - For development purposes, Tor now has a mode in which it runs for
6804 a few seconds, then stops, and starts again without exiting the
6805 process. This mode is meant to help us debug various issues with
6806 ticket 23847. To use this feature, compile with
6807 --enable-restart-debugging, and set the TOR_DEBUG_RESTART
6808 environment variable. This is expected to crash a lot, and is
6809 really meant for developers only. It will likely be removed in a
6810 future release. Implements ticket 24583.
6812 o Minor bugfixes (build, rust):
6813 - Fix output of autoconf checks to display success messages for Rust
6814 dependencies and a suitable rustc compiler version. Fixes bug
6815 24612; bugfix on 0.3.1.3-alpha.
6816 - Don't pass the --quiet option to cargo: it seems to suppress some
6817 errors, which is not what we want to do when building. Fixes bug
6818 24518; bugfix on 0.3.1.7.
6819 - Build correctly when building from outside Tor's source tree with
6820 the TOR_RUST_DEPENDENCIES option set. Fixes bug 22768; bugfix
6823 o Minor bugfixes (C correctness):
6824 - Fix a very unlikely (impossible, we believe) null pointer
6825 dereference. Fixes bug 25629; bugfix on 0.2.9.15. Found by
6826 Coverity; this is CID 1430932.
6828 o Minor bugfixes (channel, client):
6829 - Better identify client connection when reporting to the geoip
6830 client cache. Fixes bug 24904; bugfix on 0.3.1.7.
6832 o Minor bugfixes (circuit, cannibalization):
6833 - Don't cannibalize preemptively-built circuits if we no longer
6834 recognize their first hop. This situation can happen if our Guard
6835 relay went off the consensus after the circuit was created. Fixes
6836 bug 24469; bugfix on 0.0.6.
6838 o Minor bugfixes (client, backport from 0.3.4.1-alpha):
6839 - Don't consider Tor running as a client if the ControlPort is open,
6840 but no actual client ports are open. Fixes bug 26062; bugfix
6843 o Minor bugfixes (compilation):
6844 - Fix a C99 compliance issue in our configuration script that caused
6845 compilation issues when compiling Tor with certain versions of
6846 xtools. Fixes bug 25474; bugfix on 0.3.2.5-alpha.
6848 o Minor bugfixes (controller):
6849 - Restore the correct operation of the RESOLVE command, which had
6850 been broken since we added the ability to enable/disable DNS on
6851 specific listener ports. Fixes bug 25617; bugfix on 0.2.9.3-alpha.
6852 - Avoid a (nonfatal) assertion failure when extending a one-hop
6853 circuit from the controller to become a multihop circuit. Fixes
6854 bug 24903; bugfix on 0.2.5.2-alpha.
6856 o Minor bugfixes (correctness):
6857 - Remove a nonworking, unnecessary check to see whether a circuit
6858 hop's identity digest was set when the circuit failed. Fixes bug
6859 24927; bugfix on 0.2.4.4-alpha.
6861 o Minor bugfixes (correctness, client, backport from 0.3.4.1-alpha):
6862 - Upon receiving a malformed connected cell, stop processing the
6863 cell immediately. Previously we would mark the connection for
6864 close, but continue processing the cell as if the connection were
6865 open. Fixes bug 26072; bugfix on 0.2.4.7-alpha.
6867 o Minor bugfixes (directory authorities, IPv6):
6868 - When creating a routerstatus (vote) from a routerinfo (descriptor),
6869 set the IPv6 address to the unspecified IPv6 address, and
6870 explicitly initialize the port to zero. Fixes bug 24488; bugfix
6873 o Minor bugfixes (documentation):
6874 - Document that the PerConnBW{Rate,Burst} options will fall back to
6875 their corresponding consensus parameters only if those parameters
6876 are set. Previously we had claimed that these values would always
6877 be set in the consensus. Fixes bug 25296; bugfix on 0.2.2.7-alpha.
6879 o Minor bugfixes (documentation, backport from 0.3.4.1-alpha):
6880 - Stop saying in the manual that clients cache ipv4 dns answers from
6881 exit relays. We haven't used them since 0.2.6.3-alpha, and in
6882 ticket 24050 we stopped even caching them as of 0.3.2.6-alpha, but
6883 we forgot to say so in the man page. Fixes bug 26052; bugfix
6886 o Minor bugfixes (exit relay DNS retries):
6887 - Re-attempt timed-out DNS queries 3 times before failure, since our
6888 timeout is 5 seconds for them, but clients wait 10-15. Also allow
6889 slightly more timeouts per resolver when an exit has multiple
6890 resolvers configured. Fixes bug 21394; bugfix on 0.3.1.9.
6892 o Minor bugfixes (fallback directory mirrors):
6893 - Make updateFallbackDirs.py search harder for python. (Some OSs
6894 don't put it in /usr/bin.) Fixes bug 24708; bugfix
6897 o Minor bugfixes (hibernation, bandwidth accounting, shutdown):
6898 - When hibernating, close connections normally and allow them to
6899 flush. Fixes bug 23571; bugfix on 0.2.4.7-alpha. Also fixes
6901 - Do not attempt to launch self-reachability tests when entering
6902 hibernation. Fixes a case of bug 12062; bugfix on 0.0.9pre5.
6903 - Resolve several bugs related to descriptor fetching on bridge
6904 clients with bandwidth accounting enabled. (This combination is
6905 not recommended!) Fixes a case of bug 12062; bugfix
6907 - When hibernating, do not attempt to launch DNS checks. Fixes a
6908 case of bug 12062; bugfix on 0.1.2.2-alpha.
6909 - When hibernating, do not try to upload or download descriptors.
6910 Fixes a case of bug 12062; bugfix on 0.0.9pre5.
6912 o Minor bugfixes (IPv6, bridges):
6913 - Tor now always sets IPv6 preferences for bridges. Fixes bug 24573;
6914 bugfix on 0.2.8.2-alpha.
6915 - Tor now sets IPv6 address in the routerstatus as well as in the
6916 router descriptors when updating addresses for a bridge. Closes
6917 ticket 24572; bugfix on 0.2.4.5-alpha. Patch by "ffmancera".
6919 o Minor bugfixes (Linux seccomp2 sandbox):
6920 - When running with the sandbox enabled, reload configuration files
6921 correctly even when %include was used. Previously we would crash.
6922 Fixes bug 22605; bugfix on 0.3.1. Patch from Daniel Pinto.
6924 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.4.1-alpha):
6925 - Allow the nanosleep() system call, which glibc uses to implement
6926 sleep() and usleep(). Fixes bug 24969; bugfix on 0.2.5.1-alpha.
6928 o Minor bugfixes (logging):
6929 - Fix a (mostly harmless) race condition when invoking
6930 LOG_PROTOCOL_WARN message from a subthread while the torrc options
6931 are changing. Fixes bug 23954; bugfix on 0.1.1.9-alpha.
6933 o Minor bugfixes (man page, SocksPort):
6934 - Remove dead code from the old "SocksSocket" option, and rename
6935 SocksSocketsGroupWritable to UnixSocksGroupWritable. The old
6936 option still works, but is deprecated. Fixes bug 24343; bugfix
6939 o Minor bugfixes (memory leaks):
6940 - Avoid possible at-exit memory leaks related to use of Libevent's
6941 event_base_once() function. (This function tends to leak memory if
6942 the event_base is closed before the event fires.) Fixes bug 24584;
6943 bugfix on 0.2.8.1-alpha.
6944 - Fix a harmless memory leak in tor-resolve. Fixes bug 24582; bugfix
6947 o Minor bugfixes (network IPv6 test):
6948 - Tor's test scripts now check if "ping -6 ::1" works when the user
6949 runs "make test-network-all". Fixes bug 24677; bugfix on
6950 0.2.9.3-alpha. Patch by "ffmancera".
6952 o Minor bugfixes (networking):
6953 - string_is_valid_hostname() will not consider IP strings to be
6954 valid hostnames. Fixes bug 25055; bugfix on Tor 0.2.5.5.
6956 o Minor bugfixes (onion service v3):
6957 - Avoid an assertion failure when the next onion service descriptor
6958 rotation type is out of sync with the consensus's valid-after
6959 time. Instead, log a warning message with extra information, so we
6960 can better hunt down the cause of this assertion. Fixes bug 25306;
6961 bugfix on 0.3.2.1-alpha.
6963 o Minor bugfixes (onion service, backport from 0.3.4.1-alpha):
6964 - Fix a memory leak when a v3 onion service is configured and gets a
6965 SIGHUP signal. Fixes bug 25901; bugfix on 0.3.2.1-alpha.
6966 - When parsing the descriptor signature, look for the token plus an
6967 extra white-space at the end. This is more correct but also will
6968 allow us to support new fields that might start with "signature".
6969 Fixes bug 26069; bugfix on 0.3.0.1-alpha.
6971 o Minor bugfixes (onion services):
6972 - If we are configured to offer a single onion service, don't log
6973 long-term established one hop rendezvous points in the heartbeat.
6974 Fixes bug 25116; bugfix on 0.2.9.6-rc.
6976 o Minor bugfixes (performance):
6977 - Reduce the number of circuits that will be opened at once during
6978 the circuit build timeout phase. This is done by increasing the
6979 idle timeout to 3 minutes, and lowering the maximum number of
6980 concurrent learning circuits to 10. Fixes bug 24769; bugfix
6982 - Avoid calling protocol_list_supports_protocol() from inside tight
6983 loops when running with cached routerinfo_t objects. Instead,
6984 summarize the relevant protocols as flags in the routerinfo_t, as
6985 we do for routerstatus_t objects. This change simplifies our code
6986 a little, and saves a large amount of short-term memory allocation
6987 operations. Fixes bug 25008; bugfix on 0.2.9.4-alpha.
6989 o Minor bugfixes (performance, timeouts):
6990 - Consider circuits for timeout as soon as they complete a hop. This
6991 is more accurate than applying the timeout in
6992 circuit_expire_building() because that function is only called
6993 once per second, which is now too slow for typical timeouts on the
6994 current network. Fixes bug 23114; bugfix on 0.2.2.2-alpha.
6995 - Use onion service circuits (and other circuits longer than 3 hops)
6996 to calculate a circuit build timeout. Previously, Tor only
6997 calculated its build timeout based on circuits that planned to be
6998 exactly 3 hops long. With this change, we include measurements
6999 from all circuits at the point where they complete their third
7000 hop. Fixes bug 23100; bugfix on 0.2.2.2-alpha.
7002 o Minor bugfixes (relay, crash, backport from 0.3.4.1-alpha):
7003 - Avoid a crash when running with DirPort set but ORPort turned off.
7004 Fixes a case of bug 23693; bugfix on 0.3.1.1-alpha.
7006 o Minor bugfixes (Rust FFI):
7007 - Fix a minor memory leak which would happen whenever the C code
7008 would call the Rust implementation of
7009 protover_get_supported_protocols(). This was due to the C version
7010 returning a static string, whereas the Rust version newly allocated
7011 a CString to pass across the FFI boundary. Consequently, the C
7012 code was not expecting to need to free() what it was given. Fixes
7013 bug 25127; bugfix on 0.3.2.1-alpha.
7015 o Minor bugfixes (spelling):
7016 - Use the "misspell" tool to detect and fix typos throughout the
7017 source code. Fixes bug 23650; bugfix on various versions of Tor.
7018 Patch from Deepesh Pathak.
7020 o Minor bugfixes (testing):
7021 - Avoid intermittent test failures due to a test that had relied on
7022 onion service introduction point creation finishing within 5
7023 seconds of real clock time. Fixes bug 25450; bugfix
7025 - Give out Exit flags in bootstrapping networks. Fixes bug 24137;
7026 bugfix on 0.2.3.1-alpha.
7028 o Minor bugfixes (unit test, monotonic time):
7029 - Increase a constant (1msec to 10msec) in the monotonic time test
7030 that makes sure the nsec/usec/msec times read are synchronized.
7031 This change was needed to accommodate slow systems like armel or
7032 when the clock_gettime() is not a VDSO on the running kernel.
7033 Fixes bug 25113; bugfix on 0.2.9.1.
7035 o Code simplification and refactoring:
7036 - Move the list of default directory authorities to its own file.
7037 Closes ticket 24854. Patch by "beastr0".
7038 - Remove the old (deterministic) directory retry logic entirely:
7039 We've used exponential backoff exclusively for some time. Closes
7041 - Remove the unused nodelist_recompute_all_hsdir_indices(). Closes
7043 - Remove a series of counters used to track circuit extend attempts
7044 and connection status but that in reality we aren't using for
7045 anything other than stats logged by a SIGUSR1 signal. Closes
7047 - Remove /usr/athena from search path in configure.ac. Closes
7049 - Remove duplicate code in node_has_curve25519_onion_key() and
7050 node_get_curve25519_onion_key(), and add a check for a zero
7051 microdesc curve25519 onion key. Closes ticket 23966, patch by
7052 "aruna1234" and teor.
7053 - Rewrite channel_rsa_id_group_set_badness to reduce temporary
7054 memory allocations with large numbers of OR connections (e.g.
7055 relays). Closes ticket 24119.
7056 - Separate the function that deletes ephemeral files when Tor
7058 - Small changes to Tor's buf_t API to make it suitable for use as a
7059 general-purpose safe string constructor. Closes ticket 22342.
7060 - Switch -Wnormalized=id to -Wnormalized=nfkc in configure.ac to
7061 avoid source code identifier confusion. Closes ticket 24467.
7062 - The tor_git_revision[] constant no longer needs to be redeclared
7063 by everything that links against the rest of Tor. Done as part of
7064 ticket 23845, to simplify our external API.
7065 - We make extend_info_from_node() use node_get_curve25519_onion_key()
7066 introduced in ticket 23577 to access the curve25519 public keys
7067 rather than accessing it directly. Closes ticket 23760. Patch by
7069 - Add a function to log channels' scheduler state changes to aid
7070 debugging efforts. Closes ticket 24531.
7073 - Improved the documentation of AccountingStart parameter. Closes
7075 - Update the documentation for "Log" to include the current list of
7076 logging domains. Closes ticket 25378.
7077 - Add documentation on how to build tor with Rust dependencies
7078 without having to be online. Closes ticket 22907; bugfix
7080 - Clarify the behavior of RelayBandwidth{Rate,Burst} with client
7081 traffic. Closes ticket 24318.
7082 - Document that OutboundBindAddress doesn't apply to DNS requests.
7083 Closes ticket 22145. Patch from Aruna Maurya.
7085 o Code simplification and refactoring (channels):
7086 - Remove the incoming and outgoing channel queues. These were never
7087 used, but still took up a step in our fast path.
7088 - The majority of the channel unit tests have been rewritten and the
7089 code coverage has now been raised to 83.6% for channel.c. Closes
7091 - Remove other dead code from the channel subsystem: All together,
7092 this cleanup has removed more than 1500 lines of code overall and
7093 adding very little except for unit test.
7095 o Code simplification and refactoring (circuit rendezvous):
7096 - Split the client-side rendezvous circuit lookup into two
7097 functions: one that returns only established circuits and another
7098 that returns all kinds of circuits. Closes ticket 23459.
7100 o Code simplification and refactoring (controller):
7101 - Make most of the variables in networkstatus_getinfo_by_purpose()
7102 const. Implements ticket 24489.
7104 o Documentation (backport from 0.3.4.1-alpha):
7105 - Correct an IPv6 error in the documentation for ExitPolicy. Closes
7106 ticket 25857. Patch from "CTassisF".
7108 o Documentation (man page):
7109 - The HiddenServiceVersion torrc option accepts only one number:
7110 either version 2 or 3. Closes ticket 25026; bugfix
7113 o Documentation (manpage, denial of service):
7114 - Provide more detail about the denial-of-service options, by
7115 listing each mitigation and explaining how they relate. Closes
7119 Changes in version 0.3.1.10 - 2018-03-03
7120 Tor 0.3.1.10 backports a number of bugfixes, including important fixes for
7123 It includes an important security fix for a remote crash attack
7124 against directory authorities, tracked as TROVE-2018-001.
7126 This release also backports our new system for improved resistance to
7127 denial-of-service attacks against relays.
7129 This release also fixes several minor bugs and annoyances from
7132 All directory authorities should upgrade to one of the versions
7133 released today. Relays running 0.3.1.x may wish to update to one of
7134 the versions released today, for the DoS mitigations.
7136 Please note: according to our release calendar, Tor 0.3.1 will no
7137 longer be supported after 1 July 2018. If you will be running Tor
7138 after that date, you should make sure to plan to upgrade to the latest
7139 stable version, or downgrade to 0.2.9 (which will receive long-term
7142 o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
7143 - Fix a protocol-list handling bug that could be used to remotely crash
7144 directory authorities with a null-pointer exception. Fixes bug 25074;
7145 bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
7148 o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
7149 - Give relays some defenses against the recent network overload. We
7150 start with three defenses (default parameters in parentheses).
7151 First: if a single client address makes too many concurrent
7152 connections (>100), hang up on further connections. Second: if a
7153 single client address makes circuits too quickly (more than 3 per
7154 second, with an allowed burst of 90) while also having too many
7155 connections open (3), refuse new create cells for the next while
7156 (1-2 hours). Third: if a client asks to establish a rendezvous
7157 point to you directly, ignore the request. These defenses can be
7158 manually controlled by new torrc options, but relays will also
7159 take guidance from consensus parameters, so there's no need to
7160 configure anything manually. Implements ticket 24902.
7162 o Minor features (linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
7163 - Update the sandbox rules so that they should now work correctly
7164 with Glibc 2.26. Closes ticket 24315.
7166 o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
7167 - Fix an "off by 2" error in counting rendezvous failures on the
7168 onion service side. While we thought we would stop the rendezvous
7169 attempt after one failed circuit, we were actually making three
7170 circuit attempts before giving up. Now switch to a default of 2,
7171 and allow the consensus parameter "hs_service_max_rdv_failures" to
7172 override. Fixes bug 24895; bugfix on 0.0.6.
7174 o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
7175 - Add Link protocol version 5 to the supported protocols list. Fixes
7176 bug 25070; bugfix on 0.3.1.1-alpha.
7178 o Major bugfixes (relay, backport from 0.3.3.1-alpha):
7179 - Fix a set of false positives where relays would consider
7180 connections to other relays as being client-only connections (and
7181 thus e.g. deserving different link padding schemes) if those
7182 relays fell out of the consensus briefly. Now we look only at the
7183 initial handshake and whether the connection authenticated as a
7184 relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
7186 o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
7187 - Make our OOM handler aware of the geoip client history cache so it
7188 doesn't fill up the memory. This check is important for IPv6 and
7189 our DoS mitigation subsystem. Closes ticket 25122.
7191 o Minor feature (relay statistics, backport from 0.3.2.6-alpha):
7192 - Change relay bandwidth reporting stats interval from 4 hours to 24
7193 hours in order to reduce the efficiency of guard discovery
7194 attacks. Fixes ticket 23856.
7196 o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
7197 - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
7198 Previous versions of Tor would not have worked with OpenSSL 1.1.1,
7199 since they neither disabled TLS 1.3 nor enabled any of the
7200 ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
7201 Closes ticket 24978.
7203 o Minor features (fallback directory mirrors, backport from 0.3.2.9):
7204 - The fallback directory list has been re-generated based on the
7205 current status of the network. Tor uses fallback directories to
7206 bootstrap when it doesn't yet have up-to-date directory
7207 information. Closes ticket 24801.
7208 - Make the default DirAuthorityFallbackRate 0.1, so that clients
7209 prefer to bootstrap from fallback directory mirrors. This is a
7210 follow-up to 24679, which removed weights from the default
7211 fallbacks. Implements ticket 24681.
7213 o Minor features (geoip):
7214 - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
7217 o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
7218 - Use the actual observed address of an incoming relay connection,
7219 not the canonical address of the relay from its descriptor, when
7220 making decisions about how to handle the incoming connection.
7221 Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
7223 o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
7224 - Directory authorities, when refusing a descriptor from a rejected
7225 relay, now explicitly tell the relay (in its logs) to set a valid
7226 ContactInfo address and contact the bad-relays@ mailing list.
7227 Fixes bug 25170; bugfix on 0.2.9.1.
7229 o Minor bugfixes (address selection, backport from 0.3.2.9):
7230 - When the fascist_firewall_choose_address_ functions don't find a
7231 reachable address, set the returned address to the null address
7232 and port. This is a precautionary measure, because some callers do
7233 not check the return value. Fixes bug 24736; bugfix
7236 o Major bugfixes (bootstrapping, backport from 0.3.2.5-alpha):
7237 - Fetch descriptors aggressively whenever we lack enough to build
7238 circuits, regardless of how many descriptors we are missing.
7239 Previously, we would delay launching the fetch when we had fewer
7240 than 15 missing descriptors, even if some of those descriptors
7241 were blocking circuits from building. Fixes bug 23985; bugfix on
7242 0.1.1.11-alpha. The effects of this bug became worse in
7243 0.3.0.3-alpha, when we began treating missing descriptors from our
7244 primary guards as a reason to delay circuits.
7245 - Don't try fetching microdescriptors from relays that have failed
7246 to deliver them in the past. Fixes bug 23817; bugfix
7249 o Minor bugfixes (compilation, backport from 0.3.2.7-rc):
7250 - Fix a signed/unsigned comparison warning introduced by our fix to
7251 TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
7253 o Minor bugfixes (control port, linux seccomp2 sandbox, backport from 0.3.2.5-alpha):
7254 - Avoid a crash when attempting to use the seccomp2 sandbox together
7255 with the OwningControllerProcess feature. Fixes bug 24198; bugfix
7258 o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
7259 - Fix a possible crash on malformed consensus. If a consensus had
7260 contained an unparseable protocol line, it could have made clients
7261 and relays crash with a null-pointer exception. To exploit this
7262 issue, however, an attacker would need to be able to subvert the
7263 directory authority system. Fixes bug 25251; bugfix on
7264 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
7266 o Minor bugfixes (directory cache, backport from 0.3.2.5-alpha):
7267 - Recover better from empty or corrupt files in the consensus cache
7268 directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
7269 - When a consensus diff calculation is only partially successful,
7270 only record the successful parts as having succeeded. Partial
7271 success can happen if (for example) one compression method fails
7272 but the others succeed. Previously we misrecorded all the
7273 calculations as having succeeded, which would later cause a
7274 nonfatal assertion failure. Fixes bug 24086; bugfix
7277 o Minor bugfixes (entry guards, backport from 0.3.2.3-alpha):
7278 - Tor now updates its guard state when it reads a consensus
7279 regardless of whether it's missing descriptors. That makes tor use
7280 its primary guards to fetch descriptors in some edge cases where
7281 it would previously have used fallback directories. Fixes bug
7282 23862; bugfix on 0.3.0.1-alpha.
7284 o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
7285 - Don't treat inability to store a cached consensus object as a bug:
7286 it can happen normally when we are out of disk space. Fixes bug
7287 24859; bugfix on 0.3.1.1-alpha.
7289 o Minor bugfixes (memory usage, backport from 0.3.2.8-rc):
7290 - When queuing DESTROY cells on a channel, only queue the circuit-id
7291 and reason fields: not the entire 514-byte cell. This fix should
7292 help mitigate any bugs or attacks that fill up these queues, and
7293 free more RAM for other uses. Fixes bug 24666; bugfix
7296 o Minor bugfixes (network layer, backport from 0.3.2.5-alpha):
7297 - When closing a connection via close_connection_immediately(), we
7298 mark it as "not blocked on bandwidth", to prevent later calls from
7299 trying to unblock it, and give it permission to read. This fixes a
7300 backtrace warning that can happen on relays under various
7301 circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
7303 o Minor bugfixes (path selection, backport from 0.3.2.4-alpha):
7304 - When selecting relays by bandwidth, avoid a rounding error that
7305 could sometimes cause load to be imbalanced incorrectly.
7306 Previously, we would always round upwards; now, we round towards
7307 the nearest integer. This had the biggest effect when a relay's
7308 weight adjustments should have given it weight 0, but it got
7309 weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
7310 - When calculating the fraction of nodes that have descriptors, and
7311 all nodes in the network have zero bandwidths, count the number of
7312 nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
7313 - Actually log the total bandwidth in compute_weighted_bandwidths().
7314 Fixes bug 24170; bugfix on 0.2.4.3-alpha.
7316 o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
7317 - Improve the performance of our consensus-diff application code
7318 when Tor is built with the --enable-fragile-hardening option set.
7319 Fixes bug 24826; bugfix on 0.3.1.1-alpha.
7321 o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
7322 - Don't exit the Tor process if setrlimit() fails to change the file
7323 limit (which can happen sometimes on some versions of OSX). Fixes
7324 bug 21074; bugfix on 0.0.9pre5.
7326 o Minor bugfixes (portability, msvc, backport from 0.3.2.9):
7327 - Fix a bug in the bit-counting parts of our timing-wheel code on
7328 MSVC. (Note that MSVC is still not a supported build platform, due
7329 to cyptographic timing channel risks.) Fixes bug 24633; bugfix
7332 o Minor bugfixes (relay, partial backport):
7333 - Make the internal channel_is_client() function look at what sort
7334 of connection handshake the other side used, rather than whether
7335 the other side ever sent a create_fast cell to us. Backports part
7336 of the fixes from bugs 22805 and 24898.
7338 o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
7339 - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
7341 - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
7342 bugfix on 0.2.9.4-alpha.
7344 o Code simplification and refactoring (backport from 0.3.3.3-alpha):
7345 - Update the "rust dependencies" submodule to be a project-level
7346 repository, rather than a user repository. Closes ticket 25323.
7349 Changes in version 0.2.9.15 - 2018-03-03
7350 Tor 0.2.9.15 backports important security and stability bugfixes from
7353 It includes an important security fix for a remote crash attack
7354 against directory authorities, tracked as TROVE-2018-001.
7356 This release also backports our new system for improved resistance to
7357 denial-of-service attacks against relays.
7359 This release also fixes several minor bugs and annoyances from
7362 All directory authorities should upgrade to one of the versions
7363 released today. Relays running 0.2.9.x may wish to update to one of
7364 the versions released today, for the DoS mitigations.
7366 o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
7367 - Fix a protocol-list handling bug that could be used to remotely crash
7368 directory authorities with a null-pointer exception. Fixes bug 25074;
7369 bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
7372 o Major features (denial-of-service mitigation):
7373 - Give relays some defenses against the recent network overload. We
7374 start with three defenses (default parameters in parentheses).
7375 First: if a single client address makes too many concurrent
7376 connections (>100), hang up on further connections. Second: if a
7377 single client address makes circuits too quickly (more than 3 per
7378 second, with an allowed burst of 90) while also having too many
7379 connections open (3), refuse new create cells for the next while
7380 (1-2 hours). Third: if a client asks to establish a rendezvous
7381 point to you directly, ignore the request. These defenses can be
7382 manually controlled by new torrc options, but relays will also
7383 take guidance from consensus parameters, so there's no need to
7384 configure anything manually. Implements ticket 24902.
7386 o Major bugfixes (bootstrapping):
7387 - Fetch descriptors aggressively whenever we lack enough to build
7388 circuits, regardless of how many descriptors we are missing.
7389 Previously, we would delay launching the fetch when we had fewer
7390 than 15 missing descriptors, even if some of those descriptors
7391 were blocking circuits from building. Fixes bug 23985; bugfix on
7392 0.1.1.11-alpha. The effects of this bug became worse in
7393 0.3.0.3-alpha, when we began treating missing descriptors from our
7394 primary guards as a reason to delay circuits.
7396 o Major bugfixes (onion services, retry behavior):
7397 - Fix an "off by 2" error in counting rendezvous failures on the
7398 onion service side. While we thought we would stop the rendezvous
7399 attempt after one failed circuit, we were actually making three
7400 circuit attempts before giving up. Now switch to a default of 2,
7401 and allow the consensus parameter "hs_service_max_rdv_failures" to
7402 override. Fixes bug 24895; bugfix on 0.0.6.
7404 o Minor feature (relay statistics):
7405 - Change relay bandwidth reporting stats interval from 4 hours to 24
7406 hours in order to reduce the efficiency of guard discovery
7407 attacks. Fixes ticket 23856.
7409 o Minor features (compatibility, OpenSSL):
7410 - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
7411 Previous versions of Tor would not have worked with OpenSSL 1.1.1,
7412 since they neither disabled TLS 1.3 nor enabled any of the
7413 ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
7414 Closes ticket 24978.
7416 o Minor features (denial-of-service avoidance):
7417 - Make our OOM handler aware of the geoip client history cache so it
7418 doesn't fill up the memory. This check is important for IPv6 and
7419 our DoS mitigation subsystem. Closes ticket 25122.
7421 o Minor features (fallback directory mirrors):
7422 - The fallback directory list has been re-generated based on the
7423 current status of the network. Tor uses fallback directories to
7424 bootstrap when it doesn't yet have up-to-date directory
7425 information. Closes ticket 24801.
7426 - Make the default DirAuthorityFallbackRate 0.1, so that clients
7427 prefer to bootstrap from fallback directory mirrors. This is a
7428 follow-up to 24679, which removed weights from the default
7429 fallbacks. Implements ticket 24681.
7431 o Minor features (geoip):
7432 - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
7435 o Minor features (linux seccomp2 sandbox):
7436 - Update the sandbox rules so that they should now work correctly
7437 with Glibc 2.26. Closes ticket 24315.
7439 o Minor bugfix (channel connection):
7440 - Use the actual observed address of an incoming relay connection,
7441 not the canonical address of the relay from its descriptor, when
7442 making decisions about how to handle the incoming connection.
7443 Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
7445 o Minor bugfix (directory authority):
7446 - Directory authorities, when refusing a descriptor from a rejected
7447 relay, now explicitly tell the relay (in its logs) to set a valid
7448 ContactInfo address and contact the bad-relays@ mailing list.
7449 Fixes bug 25170; bugfix on 0.2.9.1.
7451 o Minor bugfixes (address selection):
7452 - When the fascist_firewall_choose_address_ functions don't find a
7453 reachable address, set the returned address to the null address
7454 and port. This is a precautionary measure, because some callers do
7455 not check the return value. Fixes bug 24736; bugfix
7458 o Minor bugfixes (compilation):
7459 - Fix a signed/unsigned comparison warning introduced by our fix to
7460 TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
7462 o Minor bugfixes (control port, linux seccomp2 sandbox):
7463 - Avoid a crash when attempting to use the seccomp2 sandbox together
7464 with the OwningControllerProcess feature. Fixes bug 24198; bugfix
7467 o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
7468 - Fix a possible crash on malformed consensus. If a consensus had
7469 contained an unparseable protocol line, it could have made clients
7470 and relays crash with a null-pointer exception. To exploit this
7471 issue, however, an attacker would need to be able to subvert the
7472 directory authority system. Fixes bug 25251; bugfix on
7473 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
7475 o Minor bugfixes (memory usage):
7476 - When queuing DESTROY cells on a channel, only queue the circuit-id
7477 and reason fields: not the entire 514-byte cell. This fix should
7478 help mitigate any bugs or attacks that fill up these queues, and
7479 free more RAM for other uses. Fixes bug 24666; bugfix
7482 o Minor bugfixes (network layer):
7483 - When closing a connection via close_connection_immediately(), we
7484 mark it as "not blocked on bandwidth", to prevent later calls from
7485 trying to unblock it, and give it permission to read. This fixes a
7486 backtrace warning that can happen on relays under various
7487 circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
7489 o Minor bugfixes (OSX):
7490 - Don't exit the Tor process if setrlimit() fails to change the file
7491 limit (which can happen sometimes on some versions of OSX). Fixes
7492 bug 21074; bugfix on 0.0.9pre5.
7494 o Minor bugfixes (path selection):
7495 - When selecting relays by bandwidth, avoid a rounding error that
7496 could sometimes cause load to be imbalanced incorrectly.
7497 Previously, we would always round upwards; now, we round towards
7498 the nearest integer. This had the biggest effect when a relay's
7499 weight adjustments should have given it weight 0, but it got
7500 weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
7501 - When calculating the fraction of nodes that have descriptors, and
7502 all nodes in the network have zero bandwidths, count the number of
7503 nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
7504 - Actually log the total bandwidth in compute_weighted_bandwidths().
7505 Fixes bug 24170; bugfix on 0.2.4.3-alpha.
7507 o Minor bugfixes (portability, msvc):
7508 - Fix a bug in the bit-counting parts of our timing-wheel code on
7509 MSVC. (Note that MSVC is still not a supported build platform, due
7510 to cryptographic timing channel risks.) Fixes bug 24633; bugfix
7513 o Minor bugfixes (relay):
7514 - Make the internal channel_is_client() function look at what sort
7515 of connection handshake the other side used, rather than whether
7516 the other side ever sent a create_fast cell to us. Backports part
7517 of the fixes from bugs 22805 and 24898.
7519 o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
7520 - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
7522 - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
7523 bugfix on 0.2.9.4-alpha.
7526 Changes in version 0.3.2.10 - 2018-03-03
7527 Tor 0.3.2.10 is the second stable release in the 0.3.2 series. It
7528 backports a number of bugfixes, including important fixes for security
7531 It includes an important security fix for a remote crash attack
7532 against directory authorities, tracked as TROVE-2018-001.
7534 Additionally, it backports a fix for a bug whose severity we have
7535 upgraded: Bug 24700, which was fixed in 0.3.3.2-alpha, can be remotely
7536 triggered in order to crash relays with a use-after-free pattern. As
7537 such, we are now tracking that bug as TROVE-2018-002 and
7538 CVE-2018-0491, and backporting it to earlier releases. This bug
7539 affected versions 0.3.2.1-alpha through 0.3.2.9, as well as version
7542 This release also backports our new system for improved resistance to
7543 denial-of-service attacks against relays.
7545 This release also fixes several minor bugs and annoyances from
7548 Relays running 0.3.2.x SHOULD upgrade to one of the versions released
7549 today, for the fix to TROVE-2018-002. Directory authorities should
7550 also upgrade. (Relays on earlier versions might want to update too for
7551 the DoS mitigations.)
7553 o Major bugfixes (denial-of-service, directory authority, backport from 0.3.3.3-alpha):
7554 - Fix a protocol-list handling bug that could be used to remotely crash
7555 directory authorities with a null-pointer exception. Fixes bug 25074;
7556 bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2018-001 and
7559 o Major bugfixes (scheduler, KIST, denial-of-service, backport from 0.3.3.2-alpha):
7560 - Avoid adding the same channel twice in the KIST scheduler pending
7561 list, which could lead to remote denial-of-service use-after-free
7562 attacks against relays. Fixes bug 24700; bugfix on 0.3.2.1-alpha.
7564 o Major features (denial-of-service mitigation, backport from 0.3.3.2-alpha):
7565 - Give relays some defenses against the recent network overload. We
7566 start with three defenses (default parameters in parentheses).
7567 First: if a single client address makes too many concurrent
7568 connections (>100), hang up on further connections. Second: if a
7569 single client address makes circuits too quickly (more than 3 per
7570 second, with an allowed burst of 90) while also having too many
7571 connections open (3), refuse new create cells for the next while
7572 (1-2 hours). Third: if a client asks to establish a rendezvous
7573 point to you directly, ignore the request. These defenses can be
7574 manually controlled by new torrc options, but relays will also
7575 take guidance from consensus parameters, so there's no need to
7576 configure anything manually. Implements ticket 24902.
7578 o Major bugfixes (onion services, retry behavior, backport from 0.3.3.1-alpha):
7579 - Fix an "off by 2" error in counting rendezvous failures on the
7580 onion service side. While we thought we would stop the rendezvous
7581 attempt after one failed circuit, we were actually making three
7582 circuit attempts before giving up. Now switch to a default of 2,
7583 and allow the consensus parameter "hs_service_max_rdv_failures" to
7584 override. Fixes bug 24895; bugfix on 0.0.6.
7585 - New-style (v3) onion services now obey the "max rendezvous circuit
7586 attempts" logic. Previously they would make as many rendezvous
7587 circuit attempts as they could fit in the MAX_REND_TIMEOUT second
7588 window before giving up. Fixes bug 24894; bugfix on 0.3.2.1-alpha.
7590 o Major bugfixes (protocol versions, backport from 0.3.3.2-alpha):
7591 - Add Link protocol version 5 to the supported protocols list. Fixes
7592 bug 25070; bugfix on 0.3.1.1-alpha.
7594 o Major bugfixes (relay, backport from 0.3.3.1-alpha):
7595 - Fix a set of false positives where relays would consider
7596 connections to other relays as being client-only connections (and
7597 thus e.g. deserving different link padding schemes) if those
7598 relays fell out of the consensus briefly. Now we look only at the
7599 initial handshake and whether the connection authenticated as a
7600 relay. Fixes bug 24898; bugfix on 0.3.1.1-alpha.
7602 o Major bugfixes (scheduler, consensus, backport from 0.3.3.2-alpha):
7603 - The scheduler subsystem was failing to promptly notice changes in
7604 consensus parameters, making it harder to switch schedulers
7605 network-wide. Fixes bug 24975; bugfix on 0.3.2.1-alpha.
7607 o Minor features (denial-of-service avoidance, backport from 0.3.3.2-alpha):
7608 - Make our OOM handler aware of the geoip client history cache so it
7609 doesn't fill up the memory. This check is important for IPv6 and
7610 our DoS mitigation subsystem. Closes ticket 25122.
7612 o Minor features (compatibility, OpenSSL, backport from 0.3.3.3-alpha):
7613 - Tor will now support TLS1.3 once OpenSSL 1.1.1 is released.
7614 Previous versions of Tor would not have worked with OpenSSL 1.1.1,
7615 since they neither disabled TLS 1.3 nor enabled any of the
7616 ciphersuites it requires. Now we enable the TLS 1.3 ciphersuites.
7617 Closes ticket 24978.
7619 o Minor features (geoip):
7620 - Update geoip and geoip6 to the February 7 2018 Maxmind GeoLite2
7623 o Minor features (logging, diagnostic, backport from 0.3.3.2-alpha):
7624 - When logging a failure to create an onion service's descriptor,
7625 also log what the problem with the descriptor was. Diagnostic
7628 o Minor bugfix (channel connection, backport from 0.3.3.2-alpha):
7629 - Use the actual observed address of an incoming relay connection,
7630 not the canonical address of the relay from its descriptor, when
7631 making decisions about how to handle the incoming connection.
7632 Fixes bug 24952; bugfix on 0.2.4.11-alpha. Patch by "ffmancera".
7634 o Minor bugfixes (denial-of-service, backport from 0.3.3.3-alpha):
7635 - Fix a possible crash on malformed consensus. If a consensus had
7636 contained an unparseable protocol line, it could have made clients
7637 and relays crash with a null-pointer exception. To exploit this
7638 issue, however, an attacker would need to be able to subvert the
7639 directory authority system. Fixes bug 25251; bugfix on
7640 0.2.9.4-alpha. Also tracked as TROVE-2018-004.
7642 o Minor bugfix (directory authority, backport from 0.3.3.2-alpha):
7643 - Directory authorities, when refusing a descriptor from a rejected
7644 relay, now explicitly tell the relay (in its logs) to set a valid
7645 ContactInfo address and contact the bad-relays@ mailing list.
7646 Fixes bug 25170; bugfix on 0.2.9.1.
7648 o Minor bugfixes (build, rust, backport from 0.3.3.1-alpha):
7649 - When building with Rust on OSX, link against libresolv, to work
7650 around the issue at https://github.com/rust-lang/rust/issues/46797.
7651 Fixes bug 24652; bugfix on 0.3.1.1-alpha.
7653 o Minor bugfixes (onion services, backport from 0.3.3.2-alpha):
7654 - Remove a BUG() statement when a client fetches an onion descriptor
7655 that has a lower revision counter than the one in its cache. This
7656 can happen in normal circumstances due to HSDir desync. Fixes bug
7657 24976; bugfix on 0.3.2.1-alpha.
7659 o Minor bugfixes (logging, backport from 0.3.3.2-alpha):
7660 - Don't treat inability to store a cached consensus object as a bug:
7661 it can happen normally when we are out of disk space. Fixes bug
7662 24859; bugfix on 0.3.1.1-alpha.
7664 o Minor bugfixes (performance, fragile-hardening, backport from 0.3.3.1-alpha):
7665 - Improve the performance of our consensus-diff application code
7666 when Tor is built with the --enable-fragile-hardening option set.
7667 Fixes bug 24826; bugfix on 0.3.1.1-alpha.
7669 o Minor bugfixes (OSX, backport from 0.3.3.1-alpha):
7670 - Don't exit the Tor process if setrlimit() fails to change the file
7671 limit (which can happen sometimes on some versions of OSX). Fixes
7672 bug 21074; bugfix on 0.0.9pre5.
7674 o Minor bugfixes (spec conformance, backport from 0.3.3.3-alpha):
7675 - Forbid "-0" as a protocol version. Fixes part of bug 25249; bugfix on
7677 - Forbid UINT32_MAX as a protocol version. Fixes part of bug 25249;
7678 bugfix on 0.2.9.4-alpha.
7680 o Minor bugfixes (testing, backport from 0.3.3.1-alpha):
7681 - Fix a memory leak in the scheduler/loop_kist unit test. Fixes bug
7682 25005; bugfix on 0.3.2.7-rc.
7684 o Minor bugfixes (v3 onion services, backport from 0.3.3.2-alpha):
7685 - Look at the "HSRend" protocol version, not the "HSDir" protocol
7686 version, when deciding whether a consensus entry can support the
7687 v3 onion service protocol as a rendezvous point. Fixes bug 25105;
7688 bugfix on 0.3.2.1-alpha.
7690 o Code simplification and refactoring (backport from 0.3.3.3-alpha):
7691 - Update the "rust dependencies" submodule to be a project-level
7692 repository, rather than a user repository. Closes ticket 25323.
7694 o Documentation (backport from 0.3.3.1-alpha)
7695 - Document that operators who run more than one relay or bridge are
7696 expected to set MyFamily and ContactInfo correctly. Closes
7700 Changes in version 0.3.2.9 - 2018-01-09
7701 Tor 0.3.2.9 is the first stable release in the 0.3.2 series.
7703 The 0.3.2 series includes our long-anticipated new onion service
7704 design, with numerous security features. (For more information, see
7705 our blog post at https://blog.torproject.org/fall-harvest.) We also
7706 have a new circuit scheduler algorithm for improved performance on
7707 relays everywhere (see https://blog.torproject.org/kist-and-tell),
7708 along with many smaller features and bugfixes.
7710 Per our stable release policy, we plan to support each stable release
7711 series for at least the next nine months, or for three months after
7712 the first stable release of the next series: whichever is longer. If
7713 you need a release with long-term support, we recommend that you stay
7714 with the 0.2.9 series.
7716 Below is a list of the changes since 0.3.1.7. For a list of all
7717 changes since 0.3.2.8-rc, see the ChangeLog file.
7719 o Directory authority changes:
7720 - Add "Bastet" as a ninth directory authority to the default list.
7721 Closes ticket 23910.
7722 - The directory authority "Longclaw" has changed its IP address.
7723 Closes ticket 23592.
7724 - Remove longclaw's IPv6 address, as it will soon change. Authority
7725 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
7726 3/8 directory authorities with IPv6 addresses, but there are also
7727 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
7728 - Add an IPv6 address for the "bastet" directory authority. Closes
7731 o Major features (next-generation onion services):
7732 - Tor now supports the next-generation onion services protocol for
7733 clients and services! As part of this release, the core of
7734 proposal 224 has been implemented and is available for
7735 experimentation and testing by our users. This newer version of
7736 onion services ("v3") features many improvements over the legacy
7739 a) Better crypto (replaced SHA1/DH/RSA1024
7740 with SHA3/ed25519/curve25519)
7742 b) Improved directory protocol, leaking much less information to
7745 c) Improved directory protocol, with smaller surface for
7748 d) Better onion address security against impersonation.
7750 e) More extensible introduction/rendezvous protocol.
7752 f) A cleaner and more modular codebase.
7754 You can identify a next-generation onion address by its length:
7755 they are 56 characters long, as in
7756 "4acth47i6kxnvkewtm6q7ib2s3ufpo5sqbsnzjpbi7utijcltosqemad.onion".
7758 In the future, we will release more options and features for v3
7759 onion services, but we first need a testing period, so that the
7760 current codebase matures and becomes more robust. Planned features
7761 include: offline keys, advanced client authorization, improved
7762 guard algorithms, and statistics. For full details, see
7765 Legacy ("v2") onion services will still work for the foreseeable
7766 future, and will remain the default until this new codebase gets
7767 tested and hardened. Service operators who want to experiment with
7768 the new system can use the 'HiddenServiceVersion 3' torrc
7769 directive along with the regular onion service configuration
7770 options. For more information, see our blog post at
7771 "https://blog.torproject.org/fall-harvest". Enjoy!
7773 o Major feature (scheduler, channel):
7774 - Tor now uses new schedulers to decide which circuits should
7775 deliver cells first, in order to improve congestion at relays. The
7776 first type is called "KIST" ("Kernel Informed Socket Transport"),
7777 and is only available on Linux-like systems: it uses feedback from
7778 the kernel to prevent the kernel's TCP buffers from growing too
7779 full. The second new scheduler type is called "KISTLite": it
7780 behaves the same as KIST, but runs on systems without kernel
7781 support for inspecting TCP implementation details. The old
7782 scheduler is still available, under the name "Vanilla". To change
7783 the default scheduler preference order, use the new "Schedulers"
7784 option. (The default preference order is "KIST,KISTLite,Vanilla".)
7786 Matt Traudt implemented KIST, based on research by Rob Jansen,
7787 John Geddes, Christ Wacek, Micah Sherr, and Paul Syverson. For
7788 more information, see the design paper at
7789 http://www.robgjansen.com/publications/kist-sec2014.pdf and the
7790 followup implementation paper at https://arxiv.org/abs/1709.01044.
7791 Closes ticket 12541. For more information, see our blog post at
7792 "https://blog.torproject.org/kist-and-tell".
7794 o Major bugfixes (security, general):
7795 - Fix a denial of service bug where an attacker could use a
7796 malformed directory object to cause a Tor instance to pause while
7797 OpenSSL would try to read a passphrase from the terminal. (Tor
7798 instances run without a terminal, which is the case for most Tor
7799 packages, are not impacted.) Fixes bug 24246; bugfix on every
7800 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
7801 Found by OSS-Fuzz as testcase 6360145429790720.
7803 o Major bugfixes (security, directory authority):
7804 - Fix a denial of service issue where an attacker could crash a
7805 directory authority using a malformed router descriptor. Fixes bug
7806 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
7809 o Major bugfixes (security, onion service v2):
7810 - Fix a use-after-free error that could crash v2 Tor onion services
7811 when they failed to open circuits while expiring introduction
7812 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
7813 also tracked as TROVE-2017-013 and CVE-2017-8823.
7814 - When checking for replays in the INTRODUCE1 cell data for a
7815 (legacy) onion service, correctly detect replays in the RSA-
7816 encrypted part of the cell. We were previously checking for
7817 replays on the entire cell, but those can be circumvented due to
7818 the malleability of Tor's legacy hybrid encryption. This fix helps
7819 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
7820 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
7823 o Major bugfixes (security, relay):
7824 - When running as a relay, make sure that we never build a path
7825 through ourselves, even in the case where we have somehow lost the
7826 version of our descriptor appearing in the consensus. Fixes part
7827 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
7828 as TROVE-2017-012 and CVE-2017-8822.
7829 - When running as a relay, make sure that we never choose ourselves
7830 as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
7831 issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
7833 o Major bugfixes (bootstrapping):
7834 - Fetch descriptors aggressively whenever we lack enough to build
7835 circuits, regardless of how many descriptors we are missing.
7836 Previously, we would delay launching the fetch when we had fewer
7837 than 15 missing descriptors, even if some of those descriptors
7838 were blocking circuits from building. Fixes bug 23985; bugfix on
7839 0.1.1.11-alpha. The effects of this bug became worse in
7840 0.3.0.3-alpha, when we began treating missing descriptors from our
7841 primary guards as a reason to delay circuits.
7842 - Don't try fetching microdescriptors from relays that have failed
7843 to deliver them in the past. Fixes bug 23817; bugfix
7846 o Major bugfixes (circuit prediction):
7847 - Fix circuit prediction logic so that a client doesn't treat a port
7848 as being "handled" by a circuit if that circuit already has
7849 isolation settings on it. This change should make Tor clients more
7850 responsive by improving their chances of having a pre-created
7851 circuit ready for use when a request arrives. Fixes bug 18859;
7852 bugfix on 0.2.3.3-alpha.
7854 o Major bugfixes (exit relays, DNS):
7855 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
7856 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
7857 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
7858 identifying and finding a workaround to this bug and to Moritz,
7859 Arthur Edelstein, and Roger for helping to track it down and
7862 o Major bugfixes (relay, crash, assertion failure):
7863 - Fix a timing-based assertion failure that could occur when the
7864 circuit out-of-memory handler freed a connection's output buffer.
7865 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
7867 o Major bugfixes (usability, control port):
7868 - Report trusted clock skew indications as bootstrap errors, so
7869 controllers can more easily alert users when their clocks are
7870 wrong. Fixes bug 23506; bugfix on 0.1.2.6-alpha.
7872 o Minor features (bridge):
7873 - Bridge relays can now set the BridgeDistribution config option to
7874 add a "bridge-distribution-request" line to their bridge
7875 descriptor, which tells BridgeDB how they'd like their bridge
7876 address to be given out. (Note that as of Oct 2017, BridgeDB does
7877 not yet implement this feature.) As a side benefit, this feature
7878 provides a way to distinguish bridge descriptors from non-bridge
7879 descriptors. Implements tickets 18329.
7880 - When handling the USERADDR command on an ExtOrPort, warn when the
7881 transports provides a USERADDR with no port. In a future version,
7882 USERADDR commands of this format may be rejected. Detects problems
7883 related to ticket 23080.
7885 o Minor features (bug detection):
7886 - Log a warning message with a stack trace for any attempt to call
7887 get_options() during option validation. This pattern has caused
7888 subtle bugs in the past. Closes ticket 22281.
7890 o Minor features (build, compilation):
7891 - The "check-changes" feature is now part of the "make check" tests;
7892 we'll use it to try to prevent misformed changes files from
7893 accumulating. Closes ticket 23564.
7894 - Tor builds should now fail if there are any mismatches between the
7895 C type representing a configuration variable and the C type the
7896 data-driven parser uses to store a value there. Previously, we
7897 needed to check these by hand, which sometimes led to mistakes.
7898 Closes ticket 23643.
7900 o Minor features (client):
7901 - You can now use Tor as a tunneled HTTP proxy: use the new
7902 HTTPTunnelPort option to open a port that accepts HTTP CONNECT
7903 requests. Closes ticket 22407.
7904 - Add an extra check to make sure that we always use the newer guard
7905 selection code for picking our guards. Closes ticket 22779.
7906 - When downloading (micro)descriptors, don't split the list into
7907 multiple requests unless we want at least 32 descriptors.
7908 Previously, we split at 4, not 32, which led to significant
7909 overhead in HTTP request size and degradation in compression
7910 performance. Closes ticket 23220.
7911 - Improve log messages when missing descriptors for primary guards.
7912 Resolves ticket 23670.
7914 o Minor features (command line):
7915 - Add a new commandline option, --key-expiration, which prints when
7916 the current signing key is going to expire. Implements ticket
7917 17639; patch by Isis Lovecruft.
7919 o Minor features (control port):
7920 - If an application tries to use the control port as an HTTP proxy,
7921 respond with a meaningful "This is the Tor control port" message,
7922 and log the event. Closes ticket 1667. Patch from Ravi
7924 - Provide better error message for GETINFO desc/(id|name) when not
7925 fetching router descriptors. Closes ticket 5847. Patch by
7927 - Add GETINFO "{desc,md}/download-enabled", to inform the controller
7928 whether Tor will try to download router descriptors and
7929 microdescriptors respectively. Closes ticket 22684.
7930 - Added new GETINFO targets "ip-to-country/{ipv4,ipv6}-available",
7931 so controllers can tell whether the geoip databases are loaded.
7932 Closes ticket 23237.
7933 - Adds a timestamp field to the CIRC_BW and STREAM_BW bandwidth
7934 events. Closes ticket 19254. Patch by "DonnchaC".
7936 o Minor features (development support):
7937 - Developers can now generate a call-graph for Tor using the
7938 "calltool" python program, which post-processes object dumps. It
7939 should work okay on many Linux and OSX platforms, and might work
7940 elsewhere too. To run it, install calltool from
7941 https://gitweb.torproject.org/user/nickm/calltool.git and run
7942 "make callgraph". Closes ticket 19307.
7944 o Minor features (directory authority):
7945 - Make the "Exit" flag assignment only depend on whether the exit
7946 policy allows connections to ports 80 and 443. Previously relays
7947 would get the Exit flag if they allowed connections to one of
7948 these ports and also port 6667. Resolves ticket 23637.
7950 o Minor features (ed25519):
7951 - Add validation function to checks for torsion components in
7952 ed25519 public keys, used by prop224 client-side code. Closes
7953 ticket 22006. Math help by Ian Goldberg.
7955 o Minor features (exit relay, DNS):
7956 - Improve the clarity and safety of the log message from evdns when
7957 receiving an apparently spoofed DNS reply. Closes ticket 3056.
7959 o Minor features (fallback directory mirrors):
7960 - The fallback directory list has been re-generated based on the
7961 current status of the network. Tor uses fallback directories to
7962 bootstrap when it doesn't yet have up-to-date directory
7963 information. Closes ticket 24801.
7964 - Make the default DirAuthorityFallbackRate 0.1, so that clients
7965 prefer to bootstrap from fallback directory mirrors. This is a
7966 follow-up to 24679, which removed weights from the default
7967 fallbacks. Implements ticket 24681.
7969 o Minor features (geoip):
7970 - Update geoip and geoip6 to the January 5 2018 Maxmind GeoLite2
7973 o Minor features (integration, hardening):
7974 - Add a new NoExec option to prevent Tor from running other
7975 programs. When this option is set to 1, Tor will never try to run
7976 another program, regardless of the settings of
7977 PortForwardingHelper, ClientTransportPlugin, or
7978 ServerTransportPlugin. Once NoExec is set, it cannot be disabled
7979 without restarting Tor. Closes ticket 22976.
7981 o Minor features (linux seccomp2 sandbox):
7982 - Update the sandbox rules so that they should now work correctly
7983 with Glibc 2.26. Closes ticket 24315.
7985 o Minor features (logging):
7986 - Provide better warnings when the getrandom() syscall fails. Closes
7988 - Downgrade a pair of log messages that could occur when an exit's
7989 resolver gave us an unusual (but not forbidden) response. Closes
7991 - Improve the message we log when re-enabling circuit build timeouts
7992 after having received a consensus. Closes ticket 20963.
7993 - Log more circuit information whenever we are about to try to
7994 package a relay cell on a circuit with a nonexistent n_chan.
7995 Attempt to diagnose ticket 8185.
7996 - Improve info-level log identification of particular circuits, to
7997 help with debugging. Closes ticket 23645.
7998 - Improve the warning message for specifying a relay by nickname.
7999 The previous message implied that nickname registration was still
8000 part of the Tor network design, which it isn't. Closes
8002 - If the sandbox filter fails to load, suggest to the user that
8003 their kernel might not support seccomp2. Closes ticket 23090.
8005 o Minor features (onion service, circuit, logging):
8006 - Improve logging of many callsite in the circuit subsystem to print
8007 the circuit identifier(s).
8008 - Log when we cleanup an intro point from a service so we know when
8009 and for what reason it happened. Closes ticket 23604.
8011 o Minor features (portability):
8012 - Tor now compiles correctly on arm64 with libseccomp-dev installed.
8013 (It doesn't yet work with the sandbox enabled.) Closes
8015 - Check at configure time whether uint8_t is the same type as
8016 unsigned char. Lots of existing code already makes this
8017 assumption, and there could be strict aliasing issues if the
8018 assumption is violated. Closes ticket 22410.
8020 o Minor features (relay):
8021 - When choosing which circuits can be expired as unused, consider
8022 circuits from clients even if those clients used regular CREATE
8023 cells to make them; and do not consider circuits from relays even
8024 if they were made with CREATE_FAST. Part of ticket 22805.
8025 - Reject attempts to use relative file paths when RunAsDaemon is
8026 set. Previously, Tor would accept these, but the directory-
8027 changing step of RunAsDaemon would give strange and/or confusing
8028 results. Closes ticket 22731.
8030 o Minor features (relay statistics):
8031 - Change relay bandwidth reporting stats interval from 4 hours to 24
8032 hours in order to reduce the efficiency of guard discovery
8033 attacks. Fixes ticket 23856.
8035 o Minor features (reverted deprecations):
8036 - The ClientDNSRejectInternalAddresses flag can once again be set in
8037 non-testing Tor networks, so long as they do not use the default
8038 directory authorities. This change also removes the deprecation of
8039 this flag from 0.2.9.2-alpha. Closes ticket 21031.
8041 o Minor features (robustness):
8042 - Change several fatal assertions when flushing buffers into non-
8043 fatal assertions, to prevent any recurrence of 23690.
8045 o Minor features (startup, safety):
8046 - When configured to write a PID file, Tor now exits if it is unable
8047 to do so. Previously, it would warn and continue. Closes
8050 o Minor features (static analysis):
8051 - The BUG() macro has been changed slightly so that Coverity no
8052 longer complains about dead code if the bug is impossible. Closes
8055 o Minor features (testing):
8056 - Our fuzzing tests now test the encrypted portions of v3 onion
8057 service descriptors. Implements more of 21509.
8058 - Add a unit test to make sure that our own generated platform
8059 string will be accepted by directory authorities. Closes
8061 - The default chutney network tests now include tests for the v3
8062 onion service design. Make sure you have the latest version of
8063 chutney if you want to run these. Closes ticket 22437.
8064 - Add a unit test to verify that we can parse a hardcoded v2 onion
8065 service descriptor. Closes ticket 15554.
8067 o Minor bugfixes (address selection):
8068 - When the fascist_firewall_choose_address_ functions don't find a
8069 reachable address, set the returned address to the null address
8070 and port. This is a precautionary measure, because some callers do
8071 not check the return value. Fixes bug 24736; bugfix
8074 o Minor bugfixes (bootstrapping):
8075 - When warning about state file clock skew, report the correct
8076 direction for the detected skew. Fixes bug 23606; bugfix
8079 o Minor bugfixes (bridge clients, bootstrap):
8080 - Retry directory downloads when we get our first bridge descriptor
8081 during bootstrap or while reconnecting to the network. Keep
8082 retrying every time we get a bridge descriptor, until we have a
8083 reachable bridge. Fixes part of bug 24367; bugfix on 0.2.0.3-alpha.
8084 - Stop delaying bridge descriptor fetches when we have cached bridge
8085 descriptors. Instead, only delay bridge descriptor fetches when we
8086 have at least one reachable bridge. Fixes part of bug 24367;
8087 bugfix on 0.2.0.3-alpha.
8088 - Stop delaying directory fetches when we have cached bridge
8089 descriptors. Instead, only delay bridge descriptor fetches when
8090 all our bridges are definitely unreachable. Fixes part of bug
8091 24367; bugfix on 0.2.0.3-alpha.
8093 o Minor bugfixes (bridge):
8094 - Overwrite the bridge address earlier in the process of retrieving
8095 its descriptor, to make sure we reach it on the configured
8096 address. Fixes bug 20532; bugfix on 0.2.0.10-alpha.
8098 o Minor bugfixes (build, compilation):
8099 - Fix a compilation warning when building with zstd support on
8100 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
8101 and fixed by Andreas Stieger.
8102 - When searching for OpenSSL, don't accept any OpenSSL library that
8103 lacks TLSv1_1_method(): Tor doesn't build with those versions.
8104 Additionally, look in /usr/local/opt/openssl, if it's present.
8105 These changes together repair the default build on OSX systems
8106 with Homebrew installed. Fixes bug 23602; bugfix on 0.2.7.2-alpha.
8107 - Fix a signed/unsigned comparison warning introduced by our fix to
8108 TROVE-2017-009. Fixes bug 24480; bugfix on 0.2.5.16.
8109 - Fix a memory leak warning in one of the libevent-related
8110 configuration tests that could occur when manually specifying
8111 -fsanitize=address. Fixes bug 24279; bugfix on 0.3.0.2-alpha.
8112 Found and patched by Alex Xu.
8113 - Fix unused-variable warnings in donna's Curve25519 SSE2 code.
8114 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
8116 o Minor bugfixes (certificate handling):
8117 - Fix a time handling bug in Tor certificates set to expire after
8118 the year 2106. Fixes bug 23055; bugfix on 0.3.0.1-alpha. Found by
8119 Coverity as CID 1415728.
8121 o Minor bugfixes (client):
8122 - By default, do not enable storage of client-side DNS values. These
8123 values were unused by default previously, but they should not have
8124 been cached at all. Fixes bug 24050; bugfix on 0.2.6.3-alpha.
8126 o Minor bugfixes (client, usability):
8127 - Refrain from needlessly rejecting SOCKS5-with-hostnames and
8128 SOCKS4a requests that contain IP address strings, even when
8129 SafeSocks in enabled, as this prevents user from connecting to
8130 known IP addresses without relying on DNS for resolving. SafeSocks
8131 still rejects SOCKS connections that connect to IP addresses when
8132 those addresses are _not_ encoded as hostnames. Fixes bug 22461;
8133 bugfix on Tor 0.2.6.2-alpha.
8135 o Minor bugfixes (code correctness):
8136 - Call htons() in extend_cell_format() for encoding a 16-bit value.
8137 Previously we used ntohs(), which happens to behave the same on
8138 all the platforms we support, but which isn't really correct.
8139 Fixes bug 23106; bugfix on 0.2.4.8-alpha.
8140 - For defense-in-depth, make the controller's write_escaped_data()
8141 function robust to extremely long inputs. Fixes bug 19281; bugfix
8142 on 0.1.1.1-alpha. Reported by Guido Vranken.
8143 - Fix several places in our codebase where a C compiler would be
8144 likely to eliminate a check, based on assuming that undefined
8145 behavior had not happened elsewhere in the code. These cases are
8146 usually a sign of redundant checking or dubious arithmetic. Found
8147 by Georg Koppen using the "STACK" tool from Wang, Zeldovich,
8148 Kaashoek, and Solar-Lezama. Fixes bug 24423; bugfix on various
8151 o Minor bugfixes (compression):
8152 - Handle a pathological case when decompressing Zstandard data when
8153 the output buffer size is zero. Fixes bug 23551; bugfix
8156 o Minor bugfixes (consensus expiry):
8157 - Check for adequate directory information correctly. Previously, Tor
8158 would reconsider whether it had sufficient directory information
8159 every 2 minutes. Fixes bug 23091; bugfix on 0.2.0.19-alpha.
8161 o Minor bugfixes (control port, linux seccomp2 sandbox):
8162 - Avoid a crash when attempting to use the seccomp2 sandbox together
8163 with the OwningControllerProcess feature. Fixes bug 24198; bugfix
8166 o Minor bugfixes (control port, onion services):
8167 - Report "FAILED" instead of "UPLOAD_FAILED" "FAILED" for the
8168 HS_DESC event when a service is not able to upload a descriptor.
8169 Fixes bug 24230; bugfix on 0.2.7.1-alpha.
8171 o Minor bugfixes (directory cache):
8172 - Recover better from empty or corrupt files in the consensus cache
8173 directory. Fixes bug 24099; bugfix on 0.3.1.1-alpha.
8174 - When a consensus diff calculation is only partially successful,
8175 only record the successful parts as having succeeded. Partial
8176 success can happen if (for example) one compression method fails
8177 but the others succeed. Previously we misrecorded all the
8178 calculations as having succeeded, which would later cause a
8179 nonfatal assertion failure. Fixes bug 24086; bugfix
8182 o Minor bugfixes (directory client):
8183 - On failure to download directory information, delay retry attempts
8184 by a random amount based on the "decorrelated jitter" algorithm.
8185 Our previous delay algorithm tended to produce extra-long delays
8186 too easily. Fixes bug 23816; bugfix on 0.2.9.1-alpha.
8188 o Minor bugfixes (directory protocol):
8189 - Directory servers now include a "Date:" http header for response
8190 codes other than 200. Clients starting with a skewed clock and a
8191 recent consensus were getting "304 Not modified" responses from
8192 directory authorities, so without the Date header, the client
8193 would never hear about a wrong clock. Fixes bug 23499; bugfix
8195 - Make clients wait for 6 seconds before trying to download a
8196 consensus from an authority. Fixes bug 17750; bugfix
8199 o Minor bugfixes (documentation):
8200 - Document better how to read gcov, and what our gcov postprocessing
8201 scripts do. Fixes bug 23739; bugfix on 0.2.9.1-alpha.
8202 - Fix manpage to not refer to the obsolete (and misspelled)
8203 UseEntryGuardsAsDirectoryGuards parameter in the description of
8204 NumDirectoryGuards. Fixes bug 23611; bugfix on 0.2.4.8-alpha.
8206 o Minor bugfixes (DoS-resistance):
8207 - If future code asks if there are any running bridges, without
8208 checking if bridges are enabled, log a BUG warning rather than
8209 crashing. Fixes bug 23524; bugfix on 0.3.0.1-alpha.
8211 o Minor bugfixes (entry guards):
8212 - Tor now updates its guard state when it reads a consensus
8213 regardless of whether it's missing descriptors. That makes tor use
8214 its primary guards to fetch descriptors in some edge cases where
8215 it would previously have used fallback directories. Fixes bug
8216 23862; bugfix on 0.3.0.1-alpha.
8218 o Minor bugfixes (format strictness):
8219 - Restrict several data formats to decimal. Previously, the
8220 BuildTimeHistogram entries in the state file, the "bw=" entries in
8221 the bandwidth authority file, and the process IDs passed to the
8222 __OwningControllerProcess option could all be specified in hex or
8223 octal as well as in decimal. This was not an intentional feature.
8224 Fixes bug 22802; bugfixes on 0.2.2.1-alpha, 0.2.2.2-alpha,
8227 o Minor bugfixes (heartbeat):
8228 - If we fail to write a heartbeat message, schedule a retry for the
8229 minimum heartbeat interval number of seconds in the future. Fixes
8230 bug 19476; bugfix on 0.2.3.1-alpha.
8232 o Minor bugfixes (logging):
8233 - Suppress a log notice when relay descriptors arrive. We already
8234 have a bootstrap progress for this so no need to log notice
8235 everytime tor receives relay descriptors. Microdescriptors behave
8236 the same. Fixes bug 23861; bugfix on 0.2.8.2-alpha.
8237 - Remove duplicate log messages regarding opening non-local
8238 SocksPorts upon parsing config and opening listeners at startup.
8239 Fixes bug 4019; bugfix on 0.2.3.3-alpha.
8240 - Use a more comprehensible log message when telling the user
8241 they've excluded every running exit node. Fixes bug 7890; bugfix
8243 - When logging the number of descriptors we intend to download per
8244 directory request, do not log a number higher than then the number
8245 of descriptors we're fetching in total. Fixes bug 19648; bugfix
8247 - When warning about a directory owned by the wrong user, log the
8248 actual name of the user owning the directory. Previously, we'd log
8249 the name of the process owner twice. Fixes bug 23487; bugfix
8251 - Fix some messages on unexpected errors from the seccomp2 library.
8252 Fixes bug 22750; bugfix on 0.2.5.1-alpha. Patch from "cypherpunks".
8253 - The tor specification says hop counts are 1-based, so fix two log
8254 messages that mistakenly logged 0-based hop counts. Fixes bug
8255 18982; bugfix on 0.2.6.2-alpha and 0.2.4.5-alpha. Patch by teor.
8256 Credit to Xiaofan Li for reporting this issue.
8258 o Minor bugfixes (logging, relay shutdown, annoyance):
8259 - When a circuit is marked for close, do not attempt to package any
8260 cells for channels on that circuit. Previously, we would detect
8261 this condition lower in the call stack, when we noticed that the
8262 circuit had no attached channel, and log an annoying message.
8263 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
8265 o Minor bugfixes (memory safety, defensive programming):
8266 - Clear the target address when node_get_prim_orport() returns
8267 early. Fixes bug 23874; bugfix on 0.2.8.2-alpha.
8269 o Minor bugfixes (memory usage):
8270 - When queuing DESTROY cells on a channel, only queue the circuit-id
8271 and reason fields: not the entire 514-byte cell. This fix should
8272 help mitigate any bugs or attacks that fill up these queues, and
8273 free more RAM for other uses. Fixes bug 24666; bugfix
8276 o Minor bugfixes (network layer):
8277 - When closing a connection via close_connection_immediately(), we
8278 mark it as "not blocked on bandwidth", to prevent later calls from
8279 trying to unblock it, and give it permission to read. This fixes a
8280 backtrace warning that can happen on relays under various
8281 circumstances. Fixes bug 24167; bugfix on 0.1.0.1-rc.
8283 o Minor bugfixes (onion services):
8284 - The introduction circuit was being timed out too quickly while
8285 waiting for the rendezvous circuit to complete. Keep the intro
8286 circuit around longer instead of timing out and reopening new ones
8287 constantly. Fixes bug 23681; bugfix on 0.2.4.8-alpha.
8288 - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
8289 so it matches dir-spec.txt. Fixes bug 24262; bugfix
8291 - When handling multiple SOCKS request for the same .onion address,
8292 only fetch the service descriptor once.
8293 - Avoid a possible double close of a circuit by the intro point on
8294 error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
8295 bugfix on 0.3.0.1-alpha.
8296 - When reloading configured onion services, copy all information
8297 from the old service object. Previously, some data was omitted,
8298 causing delays in descriptor upload, and other bugs. Fixes bug
8299 23790; bugfix on 0.2.1.9-alpha.
8301 o Minor bugfixes (path selection):
8302 - When selecting relays by bandwidth, avoid a rounding error that
8303 could sometimes cause load to be imbalanced incorrectly.
8304 Previously, we would always round upwards; now, we round towards
8305 the nearest integer. This had the biggest effect when a relay's
8306 weight adjustments should have given it weight 0, but it got
8307 weight 1 instead. Fixes bug 23318; bugfix on 0.2.4.3-alpha.
8308 - When calculating the fraction of nodes that have descriptors, and
8309 all nodes in the network have zero bandwidths, count the number of
8310 nodes instead. Fixes bug 23318; bugfix on 0.2.4.10-alpha.
8311 - Actually log the total bandwidth in compute_weighted_bandwidths().
8312 Fixes bug 24170; bugfix on 0.2.4.3-alpha.
8314 o Minor bugfixes (portability):
8315 - Stop using the PATH_MAX variable, which is not defined on GNU
8316 Hurd. Fixes bug 23098; bugfix on 0.3.1.1-alpha.
8317 - Fix a bug in the bit-counting parts of our timing-wheel code on
8318 MSVC. (Note that MSVC is still not a supported build platform, due
8319 to cryptographic timing channel risks.) Fixes bug 24633; bugfix
8322 o Minor bugfixes (relay):
8323 - When uploading our descriptor for the first time after startup,
8324 report the reason for uploading as "Tor just started" rather than
8325 leaving it blank. Fixes bug 22885; bugfix on 0.2.3.4-alpha.
8326 - Avoid unnecessary calls to directory_fetches_from_authorities() on
8327 relays, to prevent spurious address resolutions and descriptor
8328 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
8329 bugfix on in 0.2.8.1-alpha.
8330 - Avoid a crash when transitioning from client mode to bridge mode.
8331 Previously, we would launch the worker threads whenever our
8332 "public server" mode changed, but not when our "server" mode
8333 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
8335 o Minor bugfixes (testing):
8336 - Fix a spurious fuzzing-only use of an uninitialized value. Found
8337 by Brian Carpenter. Fixes bug 24082; bugfix on 0.3.0.3-alpha.
8338 - Test that IPv6-only clients can use microdescriptors when running
8339 "make test-network-all". Requires chutney master 61c28b9 or later.
8340 Closes ticket 24109.
8341 - Prevent scripts/test/coverage from attempting to move gcov output
8342 to the root directory. Fixes bug 23741; bugfix on 0.2.5.1-alpha.
8343 - Capture and detect several "Result does not fit" warnings in unit
8344 tests on platforms with 32-bit time_t. Fixes bug 21800; bugfix
8346 - Fix additional channelpadding unit test failures by using mocked
8347 time instead of actual time for all tests. Fixes bug 23608; bugfix
8349 - Fix a bug in our fuzzing mock replacement for crypto_pk_checksig(),
8350 to correctly handle cases where a caller gives it an RSA key of
8351 under 160 bits. (This is not actually a bug in Tor itself, but
8352 rather in our fuzzing code.) Fixes bug 24247; bugfix on
8353 0.3.0.3-alpha. Found by OSS-Fuzz as issue 4177.
8354 - Fix a broken unit test for the OutboundAddress option: the parsing
8355 function was never returning an error on failure. Fixes bug 23366;
8356 bugfix on 0.3.0.3-alpha.
8357 - Fix a signed-integer overflow in the unit tests for
8358 dir/download_status_random_backoff, which was untriggered until we
8359 fixed bug 17750. Fixes bug 22924; bugfix on 0.2.9.1-alpha.
8361 o Minor bugfixes (usability, control port):
8362 - Stop making an unnecessary routerlist check in NETINFO clock skew
8363 detection; this was preventing clients from reporting NETINFO clock
8364 skew to controllers. Fixes bug 23532; bugfix on 0.2.4.4-alpha.
8366 o Code simplification and refactoring:
8367 - Remove various ways of testing circuits and connections for
8368 "clientness"; instead, favor channel_is_client(). Part of
8370 - Extract the code for handling newly-open channels into a separate
8371 function from the general code to handle channel state
8372 transitions. This change simplifies our callgraph, reducing the
8373 size of the largest strongly connected component by roughly a
8374 factor of two. Closes ticket 22608.
8375 - Remove dead code for largely unused statistics on the number of
8376 times we've attempted various public key operations. Fixes bug
8377 19871; bugfix on 0.1.2.4-alpha. Fix by Isis Lovecruft.
8378 - Remove several now-obsolete functions for asking about old
8379 variants directory authority status. Closes ticket 22311; patch
8381 - Remove some of the code that once supported "Named" and "Unnamed"
8382 routers. Authorities no longer vote for these flags. Closes
8384 - Rename the obsolete malleable hybrid_encrypt functions used in TAP
8385 and old hidden services, to indicate that they aren't suitable for
8386 new protocols or formats. Closes ticket 23026.
8387 - Replace our STRUCT_OFFSET() macro with offsetof(). Closes ticket
8388 22521. Patch from Neel Chauhan.
8389 - Split the enormous circuit_send_next_onion_skin() function into
8390 multiple subfunctions. Closes ticket 22804.
8391 - Split the portions of the buffer.c module that handle particular
8392 protocols into separate modules. Part of ticket 23149.
8393 - Use our test macros more consistently, to produce more useful
8394 error messages when our unit tests fail. Add coccinelle patches to
8395 allow us to re-check for test macro uses. Closes ticket 22497.
8397 o Deprecated features:
8398 - The ReachableDirAddresses and ClientPreferIPv6DirPort options are
8399 now deprecated; they do not apply to relays, and they have had no
8400 effect on clients since 0.2.8.x. Closes ticket 19704.
8401 - Deprecate HTTPProxy/HTTPProxyAuthenticator config options. They
8402 only applies to direct unencrypted HTTP connections to your
8403 directory server, which your Tor probably isn't using. Closes
8407 - Add notes in man page regarding OS support for the various
8408 scheduler types. Attempt to use less jargon in the scheduler
8409 section. Closes ticket 24254.
8410 - Clarify that the Address option is entirely about setting an
8411 advertised IPv4 address. Closes ticket 18891.
8412 - Clarify the manpage's use of the term "address" to clarify what
8413 kind of address is intended. Closes ticket 21405.
8414 - Document that onion service subdomains are allowed, and ignored.
8415 Closes ticket 18736.
8416 - Clarify in the manual that "Sandbox 1" is only supported on Linux
8417 kernels. Closes ticket 22677.
8418 - Document all values of PublishServerDescriptor in the manpage.
8419 Closes ticket 15645.
8420 - Improve the documentation for the directory port part of the
8421 DirAuthority line. Closes ticket 20152.
8422 - Restore documentation for the authorities' "approved-routers"
8423 file. Closes ticket 21148.
8426 - The AllowDotExit option has been removed as unsafe. It has been
8427 deprecated since 0.2.9.2-alpha. Closes ticket 23426.
8428 - The ClientDNSRejectInternalAddresses flag can no longer be set on
8429 non-testing networks. It has been deprecated since 0.2.9.2-alpha.
8430 Closes ticket 21031.
8431 - The controller API no longer includes an AUTHDIR_NEWDESCS event:
8432 nobody was using it any longer. Closes ticket 22377.
8435 Changes in version 0.3.1.9 - 2017-12-01:
8436 Tor 0.3.1.9 backports important security and stability fixes from the
8437 0.3.2 development series. All Tor users should upgrade to this
8438 release, or to another of the releases coming out today.
8440 o Major bugfixes (security, backport from 0.3.2.6-alpha):
8441 - Fix a denial of service bug where an attacker could use a
8442 malformed directory object to cause a Tor instance to pause while
8443 OpenSSL would try to read a passphrase from the terminal. (Tor
8444 instances run without a terminal, which is the case for most Tor
8445 packages, are not impacted.) Fixes bug 24246; bugfix on every
8446 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
8447 Found by OSS-Fuzz as testcase 6360145429790720.
8448 - Fix a denial of service issue where an attacker could crash a
8449 directory authority using a malformed router descriptor. Fixes bug
8450 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
8452 - When checking for replays in the INTRODUCE1 cell data for a
8453 (legacy) onion service, correctly detect replays in the RSA-
8454 encrypted part of the cell. We were previously checking for
8455 replays on the entire cell, but those can be circumvented due to
8456 the malleability of Tor's legacy hybrid encryption. This fix helps
8457 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
8458 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
8461 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
8462 - Fix a use-after-free error that could crash v2 Tor onion services
8463 when they failed to open circuits while expiring introduction
8464 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
8465 also tracked as TROVE-2017-013 and CVE-2017-8823.
8467 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
8468 - When running as a relay, make sure that we never build a path
8469 through ourselves, even in the case where we have somehow lost the
8470 version of our descriptor appearing in the consensus. Fixes part
8471 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
8472 as TROVE-2017-012 and CVE-2017-8822.
8473 - When running as a relay, make sure that we never choose ourselves
8474 as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
8475 issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
8477 o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
8478 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
8479 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
8480 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
8481 identifying and finding a workaround to this bug and to Moritz,
8482 Arthur Edelstein, and Roger for helping to track it down and
8485 o Minor features (bridge):
8486 - Bridges now include notice in their descriptors that they are
8487 bridges, and notice of their distribution status, based on their
8488 publication settings. Implements ticket 18329. For more fine-
8489 grained control of how a bridge is distributed, upgrade to 0.3.2.x
8492 o Minor features (directory authority, backport from 0.3.2.6-alpha):
8493 - Add an IPv6 address for the "bastet" directory authority. Closes
8496 o Minor features (geoip):
8497 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
8500 o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
8501 - Avoid unnecessary calls to directory_fetches_from_authorities() on
8502 relays, to prevent spurious address resolutions and descriptor
8503 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
8504 bugfix on in 0.2.8.1-alpha.
8506 o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
8507 - Fix unused variable warnings in donna's Curve25519 SSE2 code.
8508 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
8510 o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
8511 - When a circuit is marked for close, do not attempt to package any
8512 cells for channels on that circuit. Previously, we would detect
8513 this condition lower in the call stack, when we noticed that the
8514 circuit had no attached channel, and log an annoying message.
8515 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
8517 o Minor bugfixes (onion service, backport from 0.3.2.5-alpha):
8518 - Rename the consensus parameter "hsdir-interval" to "hsdir_interval"
8519 so it matches dir-spec.txt. Fixes bug 24262; bugfix
8522 o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
8523 - Avoid a crash when transitioning from client mode to bridge mode.
8524 Previously, we would launch the worker threads whenever our
8525 "public server" mode changed, but not when our "server" mode
8526 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
8529 Changes in version 0.3.0.13 - 2017-12-01
8530 Tor 0.3.0.13 backports important security and stability bugfixes from
8531 later Tor releases. All Tor users should upgrade to this release, or
8532 to another of the releases coming out today.
8534 Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
8535 2018. If you need a release with long-term support, please stick with
8536 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
8538 o Major bugfixes (security, backport from 0.3.2.6-alpha):
8539 - Fix a denial of service bug where an attacker could use a
8540 malformed directory object to cause a Tor instance to pause while
8541 OpenSSL would try to read a passphrase from the terminal. (Tor
8542 instances run without a terminal, which is the case for most Tor
8543 packages, are not impacted.) Fixes bug 24246; bugfix on every
8544 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
8545 Found by OSS-Fuzz as testcase 6360145429790720.
8546 - Fix a denial of service issue where an attacker could crash a
8547 directory authority using a malformed router descriptor. Fixes bug
8548 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
8550 - When checking for replays in the INTRODUCE1 cell data for a
8551 (legacy) onion service, correctly detect replays in the RSA-
8552 encrypted part of the cell. We were previously checking for
8553 replays on the entire cell, but those can be circumvented due to
8554 the malleability of Tor's legacy hybrid encryption. This fix helps
8555 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
8556 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
8559 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
8560 - Fix a use-after-free error that could crash v2 Tor onion services
8561 when they failed to open circuits while expiring introduction
8562 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
8563 also tracked as TROVE-2017-013 and CVE-2017-8823.
8565 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
8566 - When running as a relay, make sure that we never build a path
8567 through ourselves, even in the case where we have somehow lost the
8568 version of our descriptor appearing in the consensus. Fixes part
8569 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
8570 as TROVE-2017-012 and CVE-2017-8822.
8571 - When running as a relay, make sure that we never choose ourselves
8572 as a guard. Fixes part of bug 21534; bugfix on 0.3.0.1-alpha. This
8573 issue is also tracked as TROVE-2017-012 and CVE-2017-8822.
8575 o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
8576 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
8577 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
8578 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
8579 identifying and finding a workaround to this bug and to Moritz,
8580 Arthur Edelstein, and Roger for helping to track it down and
8583 o Minor features (security, windows, backport from 0.3.1.1-alpha):
8584 - Enable a couple of pieces of Windows hardening: one
8585 (HeapEnableTerminationOnCorruption) that has been on-by-default
8586 since Windows 8, and unavailable before Windows 7; and one
8587 (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
8588 affect us, but shouldn't do any harm. Closes ticket 21953.
8590 o Minor features (bridge, backport from 0.3.1.9):
8591 - Bridges now include notice in their descriptors that they are
8592 bridges, and notice of their distribution status, based on their
8593 publication settings. Implements ticket 18329. For more fine-
8594 grained control of how a bridge is distributed, upgrade to 0.3.2.x
8597 o Minor features (directory authority, backport from 0.3.2.6-alpha):
8598 - Add an IPv6 address for the "bastet" directory authority. Closes
8601 o Minor features (geoip):
8602 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
8605 o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
8606 - Avoid unnecessary calls to directory_fetches_from_authorities() on
8607 relays, to prevent spurious address resolutions and descriptor
8608 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
8609 bugfix on in 0.2.8.1-alpha.
8611 o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
8612 - Fix unused variable warnings in donna's Curve25519 SSE2 code.
8613 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
8615 o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
8616 - When a circuit is marked for close, do not attempt to package any
8617 cells for channels on that circuit. Previously, we would detect
8618 this condition lower in the call stack, when we noticed that the
8619 circuit had no attached channel, and log an annoying message.
8620 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
8622 o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
8623 - Avoid a crash when transitioning from client mode to bridge mode.
8624 Previously, we would launch the worker threads whenever our
8625 "public server" mode changed, but not when our "server" mode
8626 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
8628 o Minor bugfixes (testing, backport from 0.3.1.6-rc):
8629 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
8630 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
8633 Changes in version 0.2.9.14 - 2017-12-01
8634 Tor 0.3.0.13 backports important security and stability bugfixes from
8635 later Tor releases. All Tor users should upgrade to this release, or
8636 to another of the releases coming out today.
8638 o Major bugfixes (exit relays, DNS, backport from 0.3.2.4-alpha):
8639 - Fix an issue causing DNS to fail on high-bandwidth exit nodes,
8640 making them nearly unusable. Fixes bugs 21394 and 18580; bugfix on
8641 0.1.2.2-alpha, which introduced eventdns. Thanks to Dhalgren for
8642 identifying and finding a workaround to this bug and to Moritz,
8643 Arthur Edelstein, and Roger for helping to track it down and
8646 o Major bugfixes (security, backport from 0.3.2.6-alpha):
8647 - Fix a denial of service bug where an attacker could use a
8648 malformed directory object to cause a Tor instance to pause while
8649 OpenSSL would try to read a passphrase from the terminal. (Tor
8650 instances run without a terminal, which is the case for most Tor
8651 packages, are not impacted.) Fixes bug 24246; bugfix on every
8652 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
8653 Found by OSS-Fuzz as testcase 6360145429790720.
8654 - Fix a denial of service issue where an attacker could crash a
8655 directory authority using a malformed router descriptor. Fixes bug
8656 24245; bugfix on 0.2.9.4-alpha. Also tracked as TROVE-2017-010
8658 - When checking for replays in the INTRODUCE1 cell data for a
8659 (legacy) onion service, correctly detect replays in the RSA-
8660 encrypted part of the cell. We were previously checking for
8661 replays on the entire cell, but those can be circumvented due to
8662 the malleability of Tor's legacy hybrid encryption. This fix helps
8663 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
8664 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
8667 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
8668 - Fix a use-after-free error that could crash v2 Tor onion services
8669 when they failed to open circuits while expiring introduction
8670 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
8671 also tracked as TROVE-2017-013 and CVE-2017-8823.
8673 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
8674 - When running as a relay, make sure that we never build a path
8675 through ourselves, even in the case where we have somehow lost the
8676 version of our descriptor appearing in the consensus. Fixes part
8677 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
8678 as TROVE-2017-012 and CVE-2017-8822.
8680 o Minor features (bridge, backport from 0.3.1.9):
8681 - Bridges now include notice in their descriptors that they are
8682 bridges, and notice of their distribution status, based on their
8683 publication settings. Implements ticket 18329. For more fine-
8684 grained control of how a bridge is distributed, upgrade to 0.3.2.x
8687 o Minor features (directory authority, backport from 0.3.2.6-alpha):
8688 - Add an IPv6 address for the "bastet" directory authority. Closes
8691 o Minor features (geoip):
8692 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
8695 o Minor features (security, windows, backport from 0.3.1.1-alpha):
8696 - Enable a couple of pieces of Windows hardening: one
8697 (HeapEnableTerminationOnCorruption) that has been on-by-default
8698 since Windows 8, and unavailable before Windows 7; and one
8699 (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
8700 affect us, but shouldn't do any harm. Closes ticket 21953.
8702 o Minor bugfix (relay address resolution, backport from 0.3.2.1-alpha):
8703 - Avoid unnecessary calls to directory_fetches_from_authorities() on
8704 relays, to prevent spurious address resolutions and descriptor
8705 rebuilds. This is a mitigation for bug 21789. Fixes bug 23470;
8706 bugfix on in 0.2.8.1-alpha.
8708 o Minor bugfixes (compilation, backport from 0.3.2.1-alpha):
8709 - Fix unused variable warnings in donna's Curve25519 SSE2 code.
8710 Fixes bug 22895; bugfix on 0.2.7.2-alpha.
8712 o Minor bugfixes (logging, relay shutdown, annoyance, backport from 0.3.2.2-alpha):
8713 - When a circuit is marked for close, do not attempt to package any
8714 cells for channels on that circuit. Previously, we would detect
8715 this condition lower in the call stack, when we noticed that the
8716 circuit had no attached channel, and log an annoying message.
8717 Fixes bug 8185; bugfix on 0.2.5.4-alpha.
8719 o Minor bugfixes (relay, crash, backport from 0.3.2.4-alpha):
8720 - Avoid a crash when transitioning from client mode to bridge mode.
8721 Previously, we would launch the worker threads whenever our
8722 "public server" mode changed, but not when our "server" mode
8723 changed. Fixes bug 23693; bugfix on 0.2.6.3-alpha.
8725 o Minor bugfixes (testing, backport from 0.3.1.6-rc):
8726 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
8727 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
8730 Changes in version 0.2.8.17 - 2017-12-01
8731 Tor 0.2.8.17 backports important security and stability bugfixes from
8732 later Tor releases. All Tor users should upgrade to this release, or
8733 to another of the releases coming out today.
8735 Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
8736 2018. If you need a release with long-term support, please upgrade with
8737 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
8739 o Major bugfixes (security, backport from 0.3.2.6-alpha):
8740 - Fix a denial of service bug where an attacker could use a
8741 malformed directory object to cause a Tor instance to pause while
8742 OpenSSL would try to read a passphrase from the terminal. (Tor
8743 instances run without a terminal, which is the case for most Tor
8744 packages, are not impacted.) Fixes bug 24246; bugfix on every
8745 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
8746 Found by OSS-Fuzz as testcase 6360145429790720.
8747 - When checking for replays in the INTRODUCE1 cell data for a
8748 (legacy) onion service, correctly detect replays in the RSA-
8749 encrypted part of the cell. We were previously checking for
8750 replays on the entire cell, but those can be circumvented due to
8751 the malleability of Tor's legacy hybrid encryption. This fix helps
8752 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
8753 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
8756 o Major bugfixes (security, onion service v2, backport from 0.3.2.6-alpha):
8757 - Fix a use-after-free error that could crash v2 Tor onion services
8758 when they failed to open circuits while expiring introduction
8759 points. Fixes bug 24313; bugfix on 0.2.7.2-alpha. This issue is
8760 also tracked as TROVE-2017-013 and CVE-2017-8823.
8762 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
8763 - When running as a relay, make sure that we never build a path through
8764 ourselves, even in the case where we have somehow lost the version of
8765 our descriptor appearing in the consensus. Fixes part of bug 21534;
8766 bugfix on 0.2.0.1-alpha. This issue is also tracked as TROVE-2017-012
8769 o Minor features (bridge, backport from 0.3.1.9):
8770 - Bridges now include notice in their descriptors that they are
8771 bridges, and notice of their distribution status, based on their
8772 publication settings. Implements ticket 18329. For more fine-
8773 grained control of how a bridge is distributed, upgrade to 0.3.2.x
8776 o Minor features (directory authority, backport from 0.3.2.6-alpha):
8777 - Add an IPv6 address for the "bastet" directory authority. Closes
8780 o Minor features (geoip):
8781 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
8784 o Minor bugfixes (testing, backport from 0.3.1.6-rc):
8785 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
8786 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
8789 Changes in version 0.2.5.16 - 2017-12-01
8790 Tor 0.2.5.13 backports important security and stability bugfixes from
8791 later Tor releases. All Tor users should upgrade to this release, or
8792 to another of the releases coming out today.
8794 Note: the Tor 0.2.5 series will no longer be supported after 1 May
8795 2018. If you need a release with long-term support, please upgrade to
8796 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
8798 o Major bugfixes (security, backport from 0.3.2.6-alpha):
8799 - Fix a denial of service bug where an attacker could use a
8800 malformed directory object to cause a Tor instance to pause while
8801 OpenSSL would try to read a passphrase from the terminal. (Tor
8802 instances run without a terminal, which is the case for most Tor
8803 packages, are not impacted.) Fixes bug 24246; bugfix on every
8804 version of Tor. Also tracked as TROVE-2017-011 and CVE-2017-8821.
8805 Found by OSS-Fuzz as testcase 6360145429790720.
8806 - When checking for replays in the INTRODUCE1 cell data for a
8807 (legacy) onion service, correctly detect replays in the RSA-
8808 encrypted part of the cell. We were previously checking for
8809 replays on the entire cell, but those can be circumvented due to
8810 the malleability of Tor's legacy hybrid encryption. This fix helps
8811 prevent a traffic confirmation attack. Fixes bug 24244; bugfix on
8812 0.2.4.1-alpha. This issue is also tracked as TROVE-2017-009
8815 o Major bugfixes (security, relay, backport from 0.3.2.6-alpha):
8816 - When running as a relay, make sure that we never build a path
8817 through ourselves, even in the case where we have somehow lost the
8818 version of our descriptor appearing in the consensus. Fixes part
8819 of bug 21534; bugfix on 0.2.0.1-alpha. This issue is also tracked
8820 as TROVE-2017-012 and CVE-2017-8822.
8822 o Minor features (bridge, backport from 0.3.1.9):
8823 - Bridges now include notice in their descriptors that they are
8824 bridges, and notice of their distribution status, based on their
8825 publication settings. Implements ticket 18329. For more fine-
8826 grained control of how a bridge is distributed, upgrade to 0.3.2.x
8829 o Minor features (geoip):
8830 - Update geoip and geoip6 to the November 6 2017 Maxmind GeoLite2
8834 Changes in version 0.2.5.15 - 2017-10-25
8835 Tor 0.2.5.15 backports a collection of bugfixes from later Tor release
8836 series. It also adds a new directory authority, Bastet.
8838 Note: the Tor 0.2.5 series will no longer be supported after 1 May
8839 2018. If you need a release with long-term support, please upgrade to
8840 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
8842 o Directory authority changes:
8843 - Add "Bastet" as a ninth directory authority to the default list.
8844 Closes ticket 23910.
8845 - The directory authority "Longclaw" has changed its IP address.
8846 Closes ticket 23592.
8848 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
8849 - Avoid an assertion failure bug affecting our implementation of
8850 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
8851 handling of "0xx" differs from what we had expected. Fixes bug
8852 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
8854 o Minor features (geoip):
8855 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
8858 o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
8859 - Fix a memset() off the end of an array when packing cells. This
8860 bug should be harmless in practice, since the corrupted bytes are
8861 still in the same structure, and are always padding bytes,
8862 ignored, or immediately overwritten, depending on compiler
8863 behavior. Nevertheless, because the memset()'s purpose is to make
8864 sure that any other cell-handling bugs can't expose bytes to the
8865 network, we need to fix it. Fixes bug 22737; bugfix on
8866 0.2.4.11-alpha. Fixes CID 1401591.
8868 o Build features (backport from 0.3.1.5-alpha):
8869 - Tor's repository now includes a Travis Continuous Integration (CI)
8870 configuration file (.travis.yml). This is meant to help new
8871 developers and contributors who fork Tor to a Github repository be
8872 better able to test their changes, and understand what we expect
8873 to pass. To use this new build feature, you must fork Tor to your
8874 Github account, then go into the "Integrations" menu in the
8875 repository settings for your fork and enable Travis, then push
8876 your changes. Closes ticket 22636.
8879 Changes in version 0.2.8.16 - 2017-10-25
8880 Tor 0.2.8.16 backports a collection of bugfixes from later Tor release
8881 series, including a bugfix for a crash issue that had affected relays
8882 under memory pressure. It also adds a new directory authority, Bastet.
8884 Note: the Tor 0.2.8 series will no longer be supported after 1 Jan
8885 2018. If you need a release with long-term support, please stick with
8886 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
8888 o Directory authority changes:
8889 - Add "Bastet" as a ninth directory authority to the default list.
8890 Closes ticket 23910.
8891 - The directory authority "Longclaw" has changed its IP address.
8892 Closes ticket 23592.
8894 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
8895 - Fix a timing-based assertion failure that could occur when the
8896 circuit out-of-memory handler freed a connection's output buffer.
8897 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
8899 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
8900 - Remove longclaw's IPv6 address, as it will soon change. Authority
8901 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
8902 3/8 directory authorities with IPv6 addresses, but there are also
8903 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
8905 o Minor features (geoip):
8906 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
8910 Changes in version 0.2.9.13 - 2017-10-25
8911 Tor 0.2.9.13 backports a collection of bugfixes from later Tor release
8912 series, including a bugfix for a crash issue that had affected relays
8913 under memory pressure. It also adds a new directory authority, Bastet.
8915 o Directory authority changes:
8916 - Add "Bastet" as a ninth directory authority to the default list.
8917 Closes ticket 23910.
8918 - The directory authority "Longclaw" has changed its IP address.
8919 Closes ticket 23592.
8921 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
8922 - Fix a timing-based assertion failure that could occur when the
8923 circuit out-of-memory handler freed a connection's output buffer.
8924 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
8926 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
8927 - Remove longclaw's IPv6 address, as it will soon change. Authority
8928 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
8929 3/8 directory authorities with IPv6 addresses, but there are also
8930 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
8932 o Minor features (geoip):
8933 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
8936 o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
8937 - When a directory authority rejects a descriptor or extrainfo with
8938 a given digest, mark that digest as undownloadable, so that we do
8939 not attempt to download it again over and over. We previously
8940 tried to avoid downloading such descriptors by other means, but we
8941 didn't notice if we accidentally downloaded one anyway. This
8942 behavior became problematic in 0.2.7.2-alpha, when authorities
8943 began pinning Ed25519 keys. Fixes bug 22349; bugfix
8946 o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
8947 - Clear the address when node_get_prim_orport() returns early.
8948 Fixes bug 23874; bugfix on 0.2.8.2-alpha.
8950 o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
8951 - When running as a Windows service, set the ID of the main thread
8952 correctly. Failure to do so made us fail to send log messages to
8953 the controller in 0.2.1.16-rc, slowed down controller event
8954 delivery in 0.2.7.3-rc and later, and crash with an assertion
8955 failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
8956 Patch and diagnosis from "Vort".
8959 Changes in version 0.3.0.12 - 2017-10-25
8960 Tor 0.3.0.12 backports a collection of bugfixes from later Tor release
8961 series, including a bugfix for a crash issue that had affected relays
8962 under memory pressure. It also adds a new directory authority, Bastet.
8964 Note: the Tor 0.3.0 series will no longer be supported after 26 Jan
8965 2018. If you need a release with long-term support, please stick with
8966 the 0.2.9 series. Otherwise, please upgrade to 0.3.1 or later.
8968 o Directory authority changes:
8969 - Add "Bastet" as a ninth directory authority to the default list.
8970 Closes ticket 23910.
8971 - The directory authority "Longclaw" has changed its IP address.
8972 Closes ticket 23592.
8974 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
8975 - Fix a timing-based assertion failure that could occur when the
8976 circuit out-of-memory handler freed a connection's output buffer.
8977 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
8979 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
8980 - Remove longclaw's IPv6 address, as it will soon change. Authority
8981 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
8982 3/8 directory authorities with IPv6 addresses, but there are also
8983 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
8985 o Minor features (geoip):
8986 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
8989 o Minor bugfixes (directory authority, backport from 0.3.1.5-alpha):
8990 - When a directory authority rejects a descriptor or extrainfo with
8991 a given digest, mark that digest as undownloadable, so that we do
8992 not attempt to download it again over and over. We previously
8993 tried to avoid downloading such descriptors by other means, but we
8994 didn't notice if we accidentally downloaded one anyway. This
8995 behavior became problematic in 0.2.7.2-alpha, when authorities
8996 began pinning Ed25519 keys. Fixes bug 22349; bugfix
8999 o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
9000 - Avoid a possible double close of a circuit by the intro point on
9001 error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
9002 bugfix on 0.3.0.1-alpha.
9004 o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
9005 - Clear the address when node_get_prim_orport() returns early.
9006 Fixes bug 23874; bugfix on 0.2.8.2-alpha.
9008 o Minor bugfixes (Windows service, backport from 0.3.1.6-rc):
9009 - When running as a Windows service, set the ID of the main thread
9010 correctly. Failure to do so made us fail to send log messages to
9011 the controller in 0.2.1.16-rc, slowed down controller event
9012 delivery in 0.2.7.3-rc and later, and crash with an assertion
9013 failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
9014 Patch and diagnosis from "Vort".
9017 Changes in version 0.3.1.8 - 2017-10-25
9018 Tor 0.3.1.8 is the second stable release in the 0.3.1 series.
9019 It includes several bugfixes, including a bugfix for a crash issue
9020 that had affected relays under memory pressure. It also adds
9021 a new directory authority, Bastet.
9023 o Directory authority changes:
9024 - Add "Bastet" as a ninth directory authority to the default list.
9025 Closes ticket 23910.
9026 - The directory authority "Longclaw" has changed its IP address.
9027 Closes ticket 23592.
9029 o Major bugfixes (relay, crash, assertion failure, backport from 0.3.2.2-alpha):
9030 - Fix a timing-based assertion failure that could occur when the
9031 circuit out-of-memory handler freed a connection's output buffer.
9032 Fixes bug 23690; bugfix on 0.2.6.1-alpha.
9034 o Minor features (directory authorities, backport from 0.3.2.2-alpha):
9035 - Remove longclaw's IPv6 address, as it will soon change. Authority
9036 IPv6 addresses were originally added in 0.2.8.1-alpha. This leaves
9037 3/8 directory authorities with IPv6 addresses, but there are also
9038 52 fallback directory mirrors with IPv6 addresses. Resolves 19760.
9040 o Minor features (geoip):
9041 - Update geoip and geoip6 to the October 4 2017 Maxmind GeoLite2
9044 o Minor bugfixes (compilation, backport from 0.3.2.2-alpha):
9045 - Fix a compilation warning when building with zstd support on
9046 32-bit platforms. Fixes bug 23568; bugfix on 0.3.1.1-alpha. Found
9047 and fixed by Andreas Stieger.
9049 o Minor bugfixes (compression, backport from 0.3.2.2-alpha):
9050 - Handle a pathological case when decompressing Zstandard data when
9051 the output buffer size is zero. Fixes bug 23551; bugfix
9054 o Minor bugfixes (directory authority, backport from 0.3.2.1-alpha):
9055 - Remove the length limit on HTTP status lines that authorities can
9056 send in their replies. Fixes bug 23499; bugfix on 0.3.1.6-rc.
9058 o Minor bugfixes (hidden service, relay, backport from 0.3.2.2-alpha):
9059 - Avoid a possible double close of a circuit by the intro point on
9060 error of sending the INTRO_ESTABLISHED cell. Fixes bug 23610;
9061 bugfix on 0.3.0.1-alpha.
9063 o Minor bugfixes (memory safety, backport from 0.3.2.3-alpha):
9064 - Clear the address when node_get_prim_orport() returns early.
9065 Fixes bug 23874; bugfix on 0.2.8.2-alpha.
9067 o Minor bugfixes (unit tests, backport from 0.3.2.2-alpha):
9068 - Fix additional channelpadding unit test failures by using mocked
9069 time instead of actual time for all tests. Fixes bug 23608; bugfix
9073 Changes in version 0.2.8.15 - 2017-09-18
9074 Tor 0.2.8.15 backports a collection of bugfixes from later
9077 Most significantly, it includes a fix for TROVE-2017-008, a
9078 security bug that affects hidden services running with the
9079 SafeLogging option disabled. For more information, see
9080 https://trac.torproject.org/projects/tor/ticket/23490
9082 Note that Tor 0.2.8.x will no longer be supported after 1 Jan
9083 2018. We suggest that you upgrade to the latest stable release if
9084 possible. If you can't, we recommend that you upgrade at least to
9085 0.2.9, which will be supported until 2020.
9087 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
9088 - Avoid an assertion failure bug affecting our implementation of
9089 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
9090 handling of "0xx" differs from what we had expected. Fixes bug
9091 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
9094 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
9097 o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
9098 - Backport a fix for an "unused variable" warning that appeared
9099 in some versions of mingw. Fixes bug 22838; bugfix on
9102 o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
9103 - Fix a memset() off the end of an array when packing cells. This
9104 bug should be harmless in practice, since the corrupted bytes are
9105 still in the same structure, and are always padding bytes,
9106 ignored, or immediately overwritten, depending on compiler
9107 behavior. Nevertheless, because the memset()'s purpose is to make
9108 sure that any other cell-handling bugs can't expose bytes to the
9109 network, we need to fix it. Fixes bug 22737; bugfix on
9110 0.2.4.11-alpha. Fixes CID 1401591.
9112 o Build features (backport from 0.3.1.5-alpha):
9113 - Tor's repository now includes a Travis Continuous Integration (CI)
9114 configuration file (.travis.yml). This is meant to help new
9115 developers and contributors who fork Tor to a Github repository be
9116 better able to test their changes, and understand what we expect
9117 to pass. To use this new build feature, you must fork Tor to your
9118 Github account, then go into the "Integrations" menu in the
9119 repository settings for your fork and enable Travis, then push
9120 your changes. Closes ticket 22636.
9123 Changes in version 0.2.9.12 - 2017-09-18
9124 Tor 0.2.9.12 backports a collection of bugfixes from later
9127 Most significantly, it includes a fix for TROVE-2017-008, a
9128 security bug that affects hidden services running with the
9129 SafeLogging option disabled. For more information, see
9130 https://trac.torproject.org/projects/tor/ticket/23490
9132 o Major features (security, backport from 0.3.0.2-alpha):
9133 - Change the algorithm used to decide DNS TTLs on client and server
9134 side, to better resist DNS-based correlation attacks like the
9135 DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
9136 Feamster. Now relays only return one of two possible DNS TTL
9137 values, and clients are willing to believe DNS TTL values up to 3
9138 hours long. Closes ticket 19769.
9140 o Major bugfixes (crash, directory connections, backport from 0.3.0.5-rc):
9141 - Fix a rare crash when sending a begin cell on a circuit whose
9142 linked directory connection had already been closed. Fixes bug
9143 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
9145 o Major bugfixes (DNS, backport from 0.3.0.2-alpha):
9146 - Fix a bug that prevented exit nodes from caching DNS records for
9147 more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
9149 o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
9150 - Fix a typo that had prevented TPROXY-based transparent proxying
9151 from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
9152 Patch from "d4fq0fQAgoJ".
9154 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
9155 - Avoid an assertion failure bug affecting our implementation of
9156 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
9157 handling of "0xx" differs from what we had expected. Fixes bug
9158 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
9160 o Minor features (code style, backport from 0.3.1.3-alpha):
9161 - Add "Falls through" comments to our codebase, in order to silence
9162 GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
9163 Stieger. Closes ticket 22446.
9165 o Minor features (geoip):
9166 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
9169 o Minor bugfixes (bandwidth accounting, backport from 0.3.1.1-alpha):
9170 - Roll over monthly accounting at the configured hour and minute,
9171 rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
9172 Found by Andrey Karpov with PVS-Studio.
9174 o Minor bugfixes (compilation, backport from 0.3.1.5-alpha):
9175 - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
9176 bugfix on 0.2.8.1-alpha.
9177 - Fix warnings when building with libscrypt and openssl scrypt support
9178 on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
9179 - When building with certain versions the mingw C header files, avoid
9180 float-conversion warnings when calling the C functions isfinite(),
9181 isnan(), and signbit(). Fixes bug 22801; bugfix on 0.2.8.1-alpha.
9183 o Minor bugfixes (compilation, backport from 0.3.1.7):
9184 - Avoid compiler warnings in the unit tests for running tor_sscanf()
9185 with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
9187 o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
9188 - Backport a fix for an "unused variable" warning that appeared
9189 in some versions of mingw. Fixes bug 22838; bugfix on
9192 o Minor bugfixes (controller, backport from 0.3.1.7):
9193 - Do not crash when receiving a HSPOST command with an empty body.
9194 Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
9195 - Do not crash when receiving a POSTDESCRIPTOR command with an
9196 empty body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
9198 o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
9199 - Avoid Coverity build warnings related to our BUG() macro. By
9200 default, Coverity treats BUG() as the Linux kernel does: an
9201 instant abort(). We need to override that so our BUG() macro
9202 doesn't prevent Coverity from analyzing functions that use it.
9203 Fixes bug 23030; bugfix on 0.2.9.1-alpha.
9205 o Minor bugfixes (defensive programming, undefined behavior, backport from 0.3.1.4-alpha):
9206 - Fix a memset() off the end of an array when packing cells. This
9207 bug should be harmless in practice, since the corrupted bytes are
9208 still in the same structure, and are always padding bytes,
9209 ignored, or immediately overwritten, depending on compiler
9210 behavior. Nevertheless, because the memset()'s purpose is to make
9211 sure that any other cell-handling bugs can't expose bytes to the
9212 network, we need to fix it. Fixes bug 22737; bugfix on
9213 0.2.4.11-alpha. Fixes CID 1401591.
9215 o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
9216 - When setting the maximum number of connections allowed by the OS,
9217 always allow some extra file descriptors for other files. Fixes
9218 bug 22797; bugfix on 0.2.0.10-alpha.
9220 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
9221 - Avoid a sandbox failure when trying to re-bind to a socket and
9222 mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
9224 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
9225 - Permit the fchmod system call, to avoid crashing on startup when
9226 starting with the seccomp2 sandbox and an unexpected set of
9227 permissions on the data directory or its contents. Fixes bug
9228 22516; bugfix on 0.2.5.4-alpha.
9230 o Minor bugfixes (relay, backport from 0.3.0.5-rc):
9231 - Avoid a double-marked-circuit warning that could happen when we
9232 receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
9235 o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
9236 - Reject version numbers with non-numeric prefixes (such as +, -, or
9237 whitespace). Disallowing whitespace prevents differential version
9238 parsing between POSIX-based and Windows platforms. Fixes bug 21507
9239 and part of 21508; bugfix on 0.0.8pre1.
9241 o Build features (backport from 0.3.1.5-alpha):
9242 - Tor's repository now includes a Travis Continuous Integration (CI)
9243 configuration file (.travis.yml). This is meant to help new
9244 developers and contributors who fork Tor to a Github repository be
9245 better able to test their changes, and understand what we expect
9246 to pass. To use this new build feature, you must fork Tor to your
9247 Github account, then go into the "Integrations" menu in the
9248 repository settings for your fork and enable Travis, then push
9249 your changes. Closes ticket 22636.
9252 Changes in version 0.3.0.11 - 2017-09-18
9253 Tor 0.3.0.11 backports a collection of bugfixes from Tor the 0.3.1
9256 Most significantly, it includes a fix for TROVE-2017-008, a
9257 security bug that affects hidden services running with the
9258 SafeLogging option disabled. For more information, see
9259 https://trac.torproject.org/projects/tor/ticket/23490
9261 o Minor features (code style, backport from 0.3.1.7):
9262 - Add "Falls through" comments to our codebase, in order to silence
9263 GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
9264 Stieger. Closes ticket 22446.
9267 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
9270 o Minor bugfixes (compilation, backport from 0.3.1.7):
9271 - Avoid compiler warnings in the unit tests for calling tor_sscanf()
9272 with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
9274 o Minor bugfixes (controller, backport from 0.3.1.7):
9275 - Do not crash when receiving a HSPOST command with an empty body.
9276 Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
9277 - Do not crash when receiving a POSTDESCRIPTOR command with an empty
9278 body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
9280 o Minor bugfixes (file limits, osx, backport from 0.3.1.5-alpha):
9281 - When setting the maximum number of connections allowed by the OS,
9282 always allow some extra file descriptors for other files. Fixes
9283 bug 22797; bugfix on 0.2.0.10-alpha.
9285 o Minor bugfixes (logging, relay, backport from 0.3.1.6-rc):
9286 - Remove a forgotten debugging message when an introduction point
9287 successfully establishes a hidden service prop224 circuit with
9289 - Change three other log_warn() for an introduction point to
9290 protocol warnings, because they can be failure from the network
9291 and are not relevant to the operator. Fixes bug 23078; bugfix on
9292 0.3.0.1-alpha and 0.3.0.2-alpha.
9295 Changes in version 0.3.1.7 - 2017-09-18
9296 Tor 0.3.1.7 is the first stable release in the 0.3.1 series.
9298 With the 0.3.1 series, Tor now serves and downloads directory
9299 information in more compact formats, to save on bandwidth overhead. It
9300 also contains a new padding system to resist netflow-based traffic
9301 analysis, and experimental support for building parts of Tor in Rust
9302 (though no parts of Tor are in Rust yet). There are also numerous
9303 small features, bugfixes on earlier release series, and groundwork for
9304 the hidden services revamp of 0.3.2.
9306 This release also includes a fix for TROVE-2017-008, a security bug
9307 that affects hidden services running with the SafeLogging option
9308 disabled. For more information, see
9309 https://trac.torproject.org/projects/tor/ticket/23490
9311 Per our stable release policy, we plan to support each stable release
9312 series for at least the next nine months, or for three months after
9313 the first stable release of the next series: whichever is longer. If
9314 you need a release with long-term support, we recommend that you stay
9315 with the 0.2.9 series.
9317 Below is a list of the changes since 0.3.0. For a list of all
9318 changes since 0.3.1.6-rc, see the ChangeLog file.
9321 - To build with zstd and lzma support, Tor now requires the
9322 pkg-config tool at build time.
9324 o Major bugfixes (security, hidden services, loggging):
9325 - Fix a bug where we could log uninitialized stack when a certain
9326 hidden service error occurred while SafeLogging was disabled.
9327 Fixes bug #23490; bugfix on 0.2.7.2-alpha.
9328 This is also tracked as TROVE-2017-008 and CVE-2017-0380.
9330 o Major features (build system, continuous integration):
9331 - Tor's repository now includes a Travis Continuous Integration (CI)
9332 configuration file (.travis.yml). This is meant to help new
9333 developers and contributors who fork Tor to a Github repository be
9334 better able to test their changes, and understand what we expect
9335 to pass. To use this new build feature, you must fork Tor to your
9336 Github account, then go into the "Integrations" menu in the
9337 repository settings for your fork and enable Travis, then push
9338 your changes. Closes ticket 22636.
9340 o Major features (directory protocol):
9341 - Tor relays and authorities can now serve clients an abbreviated
9342 version of the consensus document, containing only the changes
9343 since an older consensus document that the client holds. Clients
9344 now request these documents when available. When both client and
9345 server use this new protocol, they will use far less bandwidth (up
9346 to 94% less) to keep the client's consensus up-to-date. Implements
9347 proposal 140; closes ticket 13339. Based on work by Daniel Martí.
9348 - Tor can now compress directory traffic with lzma or with zstd
9349 compression algorithms, which can deliver better bandwidth
9350 performance. Because lzma is computationally expensive, it's only
9351 used for documents that can be compressed once and served many
9352 times. Support for these algorithms requires that tor is built
9353 with the libzstd and/or liblzma libraries available. Implements
9354 proposal 278; closes ticket 21662.
9355 - Relays now perform the more expensive compression operations, and
9356 consensus diff generation, in worker threads. This separation
9357 avoids delaying the main thread when a new consensus arrives.
9359 o Major features (experimental):
9360 - Tor can now build modules written in Rust. To turn this on, pass
9361 the "--enable-rust" flag to the configure script. It's not time to
9362 get excited yet: currently, there is no actual Rust functionality
9363 beyond some simple glue code, and a notice at startup to tell you
9364 that Rust is running. Still, we hope that programmers and
9365 packagers will try building Tor with Rust support, so that we can
9366 find issues and solve portability problems. Closes ticket 22106.
9368 o Major features (traffic analysis resistance):
9369 - Connections between clients and relays now send a padding cell in
9370 each direction every 1.5 to 9.5 seconds (tunable via consensus
9371 parameters). This padding will not resist specialized
9372 eavesdroppers, but it should be enough to make many ISPs' routine
9373 network flow logging less useful in traffic analysis against
9376 Padding is negotiated using Tor's link protocol, so both relays
9377 and clients must upgrade for this to take effect. Clients may
9378 still send padding despite the relay's version by setting
9379 ConnectionPadding 1 in torrc, and may disable padding by setting
9380 ConnectionPadding 0 in torrc. Padding may be minimized for mobile
9381 users with the torrc option ReducedConnectionPadding. Implements
9382 Proposal 251 and Section 2 of Proposal 254; closes ticket 16861.
9383 - Relays will publish 24 hour totals of padding and non-padding cell
9384 counts to their extra-info descriptors, unless PaddingStatistics 0
9385 is set in torrc. These 24 hour totals are also rounded to
9388 o Major bugfixes (hidden service, relay, security):
9389 - Fix a remotely triggerable assertion failure when a hidden service
9390 handles a malformed BEGIN cell. Fixes bug 22493, tracked as
9391 TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
9392 - Fix a remotely triggerable assertion failure caused by receiving a
9393 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
9394 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
9397 o Major bugfixes (path selection, security):
9398 - When choosing which guard to use for a circuit, avoid the exit's
9399 family along with the exit itself. Previously, the new guard
9400 selection logic avoided the exit, but did not consider its family.
9401 Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
9402 006 and CVE-2017-0377.
9404 o Major bugfixes (connection usage):
9405 - We use NETINFO cells to try to determine if both relays involved
9406 in a connection will agree on the canonical status of that
9407 connection. We prefer the connections where this is the case for
9408 extend cells, and try to close connections where relays disagree
9409 on their canonical status early. Also, we now prefer the oldest
9410 valid connection for extend cells. These two changes should reduce
9411 the number of long-term connections that are kept open between
9412 relays. Fixes bug 17604; bugfix on 0.2.5.5-alpha.
9413 - Relays now log hourly statistics (look for
9414 "channel_check_for_duplicates" lines) on the total number of
9415 connections to other relays. If the number of connections per
9416 relay is unexpectedly large, this log message is at notice level.
9417 Otherwise it is at info.
9419 o Major bugfixes (entry guards):
9420 - When starting with an old consensus, do not add new entry guards
9421 unless the consensus is "reasonably live" (under 1 day old). Fixes
9422 one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
9423 - Don't block bootstrapping when a primary bridge is offline and we
9424 can't get its descriptor. Fixes bug 22325; fixes one case of bug
9425 21969; bugfix on 0.3.0.3-alpha.
9427 o Major bugfixes (linux TPROXY support):
9428 - Fix a typo that had prevented TPROXY-based transparent proxying
9429 from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
9430 Patch from "d4fq0fQAgoJ".
9432 o Major bugfixes (openbsd, denial-of-service):
9433 - Avoid an assertion failure bug affecting our implementation of
9434 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
9435 handling of "0xx" differs from what we had expected. Fixes bug
9436 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
9438 o Major bugfixes (relay, link handshake):
9439 - When performing the v3 link handshake on a TLS connection, report
9440 that we have the x509 certificate that we actually used on that
9441 connection, even if we have changed certificates since that
9442 connection was first opened. Previously, we would claim to have
9443 used our most recent x509 link certificate, which would sometimes
9444 make the link handshake fail. Fixes one case of bug 22460; bugfix
9447 o Major bugfixes (relays, key management):
9448 - Regenerate link and authentication certificates whenever the key
9449 that signs them changes; also, regenerate link certificates
9450 whenever the signed key changes. Previously, these processes were
9451 only weakly coupled, and we relays could (for minutes to hours)
9452 wind up with an inconsistent set of keys and certificates, which
9453 other relays would not accept. Fixes two cases of bug 22460;
9454 bugfix on 0.3.0.1-alpha.
9455 - When sending an Ed25519 signing->link certificate in a CERTS cell,
9456 send the certificate that matches the x509 certificate that we
9457 used on the TLS connection. Previously, there was a race condition
9458 if the TLS context rotated after we began the TLS handshake but
9459 before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
9462 o Minor features (security, windows):
9463 - Enable a couple of pieces of Windows hardening: one
9464 (HeapEnableTerminationOnCorruption) that has been on-by-default
9465 since Windows 8, and unavailable before Windows 7; and one
9466 (PROCESS_DEP_DISABLE_ATL_THUNK_EMULATION) which we believe doesn't
9467 affect us, but shouldn't do any harm. Closes ticket 21953.
9469 o Minor features (bridge authority):
9470 - Add "fingerprint" lines to the networkstatus-bridges file produced
9471 by bridge authorities. Closes ticket 22207.
9473 o Minor features (code style):
9474 - Add "Falls through" comments to our codebase, in order to silence
9475 GCC 7's -Wimplicit-fallthrough warnings. Patch from Andreas
9476 Stieger. Closes ticket 22446.
9478 o Minor features (config options):
9479 - Allow "%include" directives in torrc configuration files. These
9480 directives import the settings from other files, or from all the
9481 files in a directory. Closes ticket 1922. Code by Daniel Pinto.
9482 - Make SAVECONF return an error when overwriting a torrc that has
9483 includes. Using SAVECONF with the FORCE option will allow it to
9484 overwrite torrc even if includes are used. Related to ticket 1922.
9485 - Add "GETINFO config-can-saveconf" to tell controllers if SAVECONF
9486 will work without the FORCE option. Related to ticket 1922.
9488 o Minor features (controller):
9489 - Warn the first time that a controller requests data in the long-
9490 deprecated 'GETINFO network-status' format. Closes ticket 21703.
9492 o Minor features (defaults):
9493 - The default value for UseCreateFast is now 0: clients which
9494 haven't yet received a consensus document will now use a proper
9495 ntor handshake to talk to their directory servers whenever they
9496 can. Closes ticket 21407.
9497 - Onion key rotation and expiry intervals are now defined as a
9498 network consensus parameter, per proposal 274. The default
9499 lifetime of an onion key is increased from 7 to 28 days. Old onion
9500 keys will expire after 7 days by default. This change will make
9501 consensus diffs much smaller, and save significant bandwidth.
9502 Closes ticket 21641.
9504 o Minor features (defensive programming):
9505 - Create a pair of consensus parameters, nf_pad_tor2web and
9506 nf_pad_single_onion, to disable netflow padding in the consensus
9507 for non-anonymous connections in case the overhead is high. Closes
9510 o Minor features (diagnostic):
9511 - Add a stack trace to the bug warnings that can be logged when
9512 trying to send an outgoing relay cell with n_chan == 0. Diagnostic
9513 attempt for bug 23105.
9514 - Add logging messages to try to diagnose a rare bug that seems to
9515 generate RSA->Ed25519 cross-certificates dated in the 1970s. We
9516 think this is happening because of incorrect system clocks, but
9517 we'd like to know for certain. Diagnostic for bug 22466.
9518 - Avoid an assertion failure, and log a better error message, when
9519 unable to remove a file from the consensus cache on Windows.
9520 Attempts to mitigate and diagnose bug 22752.
9522 o Minor features (directory authority):
9523 - Improve the message that authorities report to relays that present
9524 RSA/Ed25519 keypairs that conflict with previously pinned keys.
9525 Closes ticket 22348.
9527 o Minor features (directory cache, consensus diff):
9528 - Add a new MaxConsensusAgeForDiffs option to allow directory cache
9529 operators with low-resource environments to adjust the number of
9530 consensuses they'll store and generate diffs from. Most cache
9531 operators should leave it unchanged. Helps to work around
9534 o Minor features (fallback directory list):
9535 - Update the fallback directory mirror whitelist and blacklist based
9536 on operator emails. Closes task 21121.
9537 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
9538 December 2016 (of which ~126 were still functional) with a list of
9539 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
9540 2017. Resolves ticket 21564.
9542 o Minor features (geoip):
9543 - Update geoip and geoip6 to the September 6 2017 Maxmind GeoLite2
9546 o Minor features (hidden services, logging):
9547 - Log a message when a hidden service descriptor has fewer
9548 introduction points than specified in
9549 HiddenServiceNumIntroductionPoints. Closes tickets 21598.
9550 - Log a message when a hidden service reaches its introduction point
9551 circuit limit, and when that limit is reset. Follow up to ticket
9552 21594; closes ticket 21622.
9553 - Warn user if multiple entries in EntryNodes and at least one
9554 HiddenService are used together. Pinning EntryNodes along with a
9555 hidden service can be possibly harmful; for instance see ticket
9556 14917 or 21155. Closes ticket 21155.
9558 o Minor features (linux seccomp2 sandbox):
9559 - We now have a document storage backend compatible with the Linux
9560 seccomp2 sandbox. This backend is used for consensus documents and
9561 diffs between them; in the long term, we'd like to use it for
9562 unparseable directory material too. Closes ticket 21645
9563 - Increase the maximum allowed size passed to mprotect(PROT_WRITE)
9564 from 1MB to 16MB. This was necessary with the glibc allocator in
9565 order to allow worker threads to allocate more memory -- which in
9566 turn is necessary because of our new use of worker threads for
9567 compression. Closes ticket 22096.
9569 o Minor features (logging):
9570 - Log files are no longer created world-readable by default.
9571 (Previously, most distributors would store the logs in a non-
9572 world-readable location to prevent inappropriate access. This
9573 change is an extra precaution.) Closes ticket 21729; patch
9576 o Minor features (performance):
9577 - Our Keccak (SHA-3) implementation now accesses memory more
9578 efficiently, especially on little-endian systems. Closes
9580 - Add an O(1) implementation of channel_find_by_global_id(), to
9581 speed some controller functions.
9583 o Minor features (relay, configuration):
9584 - The MyFamily option may now be repeated as many times as desired,
9585 for relays that want to configure large families. Closes ticket
9586 4998; patch by Daniel Pinto.
9588 o Minor features (relay, performance):
9589 - Always start relays with at least two worker threads, to prevent
9590 priority inversion on slow tasks. Part of the fix for bug 22883.
9591 - Allow background work to be queued with different priorities, so
9592 that a big pile of slow low-priority jobs will not starve out
9593 higher priority jobs. This lays the groundwork for a fix for
9596 o Minor features (safety):
9597 - Add an explicit check to extrainfo_parse_entry_from_string() for
9598 NULL inputs. We don't believe this can actually happen, but it may
9599 help silence a warning from the Clang analyzer. Closes
9602 o Minor features (testing):
9603 - Add more tests for compression backend initialization. Closes
9605 - Add a "--disable-memory-sentinels" feature to help with fuzzing.
9606 When Tor is compiled with this option, we disable a number of
9607 redundant memory-safety failsafes that are intended to stop bugs
9608 from becoming security issues. This makes it easier to hunt for
9609 bugs that would be security issues without the failsafes turned
9610 on. Closes ticket 21439.
9611 - Add a general event-tracing instrumentation support to Tor. This
9612 subsystem will enable developers and researchers to add fine-
9613 grained instrumentation to their Tor instances, for use when
9614 examining Tor network performance issues. There are no trace
9615 events yet, and event-tracing is off by default unless enabled at
9616 compile time. Implements ticket 13802.
9617 - Improve our version parsing tests: add tests for typical version
9618 components, add tests for invalid versions, including numeric
9619 range and non-numeric prefixes. Unit tests 21278, 21450, and
9620 21507. Partially implements 21470.
9622 o Minor bugfixes (bandwidth accounting):
9623 - Roll over monthly accounting at the configured hour and minute,
9624 rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
9625 Found by Andrey Karpov with PVS-Studio.
9627 o Minor bugfixes (code correctness):
9628 - Accurately identify client connections by their lack of peer
9629 authentication. This means that we bail out earlier if asked to
9630 extend to a client. Follow-up to 21407. Fixes bug 21406; bugfix
9633 o Minor bugfixes (compilation warnings):
9634 - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug
9635 22915; bugfix on 0.2.8.1-alpha.
9636 - Fix warnings when building with libscrypt and openssl scrypt
9637 support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
9638 - When building with certain versions of the mingw C header files,
9639 avoid float-conversion warnings when calling the C functions
9640 isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
9643 o Minor bugfixes (compilation):
9644 - Avoid compiler warnings in the unit tests for calling tor_sscanf()
9645 with wide string outputs. Fixes bug 15582; bugfix on 0.2.6.2-alpha.
9647 o Minor bugfixes (compression):
9648 - When spooling compressed data to an output buffer, don't try to
9649 spool more data when there is no more data to spool and we are not
9650 trying to flush the input. Previously, we would sometimes launch
9651 compression requests with nothing to do, which interferes with our
9652 22672 checks. Fixes bug 22719; bugfix on 0.2.0.16-alpha.
9654 o Minor bugfixes (configuration):
9655 - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
9656 bug 22252; bugfix on 0.2.9.3-alpha.
9658 o Minor bugfixes (connection lifespan):
9659 - Allow more control over how long TLS connections are kept open:
9660 unify CircuitIdleTimeout and PredictedPortsRelevanceTime into a
9661 single option called CircuitsAvailableTimeout. Also, allow the
9662 consensus to control the default values for both this preference
9663 and the lifespan of relay-to-relay connections. Fixes bug 17592;
9664 bugfix on 0.2.5.5-alpha.
9665 - Increase the initial circuit build timeout testing frequency, to
9666 help ensure that ReducedConnectionPadding clients finish learning
9667 a timeout before their orconn would expire. The initial testing
9668 rate was set back in the days of TAP and before the Tor Browser
9669 updater, when we had to be much more careful about new clients
9670 making lots of circuits. With this change, a circuit build timeout
9671 is learned in about 15-20 minutes, instead of 100-120 minutes.
9673 o Minor bugfixes (controller):
9674 - Do not crash when receiving a HSPOST command with an empty body.
9675 Fixes part of bug 22644; bugfix on 0.2.7.1-alpha.
9676 - Do not crash when receiving a POSTDESCRIPTOR command with an empty
9677 body. Fixes part of bug 22644; bugfix on 0.2.0.1-alpha.
9678 - GETINFO onions/current and onions/detached no longer respond with
9679 551 on empty lists. Fixes bug 21329; bugfix on 0.2.7.1-alpha.
9680 - Trigger HS descriptor events on the control port when the client
9681 fails to pick a hidden service directory for a hidden service.
9682 This can happen if all the hidden service directories are in
9683 ExcludeNodes, or they have all been queried within the last 15
9684 minutes. Fixes bug 22042; bugfix on 0.2.5.2-alpha.
9686 o Minor bugfixes (correctness):
9687 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
9688 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
9690 o Minor bugfixes (coverity build support):
9691 - Avoid Coverity build warnings related to our BUG() macro. By
9692 default, Coverity treats BUG() as the Linux kernel does: an
9693 instant abort(). We need to override that so our BUG() macro
9694 doesn't prevent Coverity from analyzing functions that use it.
9695 Fixes bug 23030; bugfix on 0.2.9.1-alpha.
9697 o Minor bugfixes (defensive programming):
9698 - Detect and break out of infinite loops in our compression code. We
9699 don't think that any such loops exist now, but it's best to be
9700 safe. Closes ticket 22672.
9701 - Fix a memset() off the end of an array when packing cells. This
9702 bug should be harmless in practice, since the corrupted bytes are
9703 still in the same structure, and are always padding bytes,
9704 ignored, or immediately overwritten, depending on compiler
9705 behavior. Nevertheless, because the memset()'s purpose is to make
9706 sure that any other cell-handling bugs can't expose bytes to the
9707 network, we need to fix it. Fixes bug 22737; bugfix on
9708 0.2.4.11-alpha. Fixes CID 1401591.
9710 o Minor bugfixes (directory authority):
9711 - When a directory authority rejects a descriptor or extrainfo with
9712 a given digest, mark that digest as undownloadable, so that we do
9713 not attempt to download it again over and over. We previously
9714 tried to avoid downloading such descriptors by other means, but we
9715 didn't notice if we accidentally downloaded one anyway. This
9716 behavior became problematic in 0.2.7.2-alpha, when authorities
9717 began pinning Ed25519 keys. Fixes bug 22349; bugfix
9719 - When rejecting a router descriptor for running an obsolete version
9720 of Tor without ntor support, warn about the obsolete tor version,
9721 not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
9722 - Prevent the shared randomness subsystem from asserting when
9723 initialized by a bridge authority with an incomplete configuration
9724 file. Fixes bug 21586; bugfix on 0.2.9.8.
9726 o Minor bugfixes (error reporting, windows):
9727 - When formatting Windows error messages, use the English format to
9728 avoid codepage issues. Fixes bug 22520; bugfix on 0.1.2.8-alpha.
9731 o Minor bugfixes (exit-side DNS):
9732 - Fix an untriggerable assertion that checked the output of a
9733 libevent DNS error, so that the assertion actually behaves as
9734 expected. Fixes bug 22244; bugfix on 0.2.0.20-rc. Found by Andrey
9735 Karpov using PVS-Studio.
9737 o Minor bugfixes (fallback directories):
9738 - Make the usage example in updateFallbackDirs.py actually work, and
9739 explain what it does. Fixes bug 22270; bugfix on 0.3.0.3-alpha.
9740 - Decrease the guard flag average required to be a fallback. This
9741 allows us to keep relays that have their guard flag removed when
9742 they restart. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
9743 - Decrease the minimum number of fallbacks to 100. Fixes bug 20913;
9744 bugfix on 0.2.8.1-alpha.
9745 - Make sure fallback directory mirrors have the same address, port,
9746 and relay identity key for at least 30 days before they are
9747 selected. Fixes bug 20913; bugfix on 0.2.8.1-alpha.
9749 o Minor bugfixes (file limits, osx):
9750 - When setting the maximum number of connections allowed by the OS,
9751 always allow some extra file descriptors for other files. Fixes
9752 bug 22797; bugfix on 0.2.0.10-alpha.
9754 o Minor bugfixes (hidden services):
9755 - Increase the number of circuits that a service is allowed to
9756 open over a specific period of time. The value was lower than it
9757 should be (8 vs 12) in the normal case of 3 introduction points.
9758 Fixes bug 22159; bugfix on 0.3.0.5-rc.
9759 - Fix a BUG warning during HSv3 descriptor decoding that could be
9760 cause by a specially crafted descriptor. Fixes bug 23233; bugfix
9761 on 0.3.0.1-alpha. Bug found by "haxxpop".
9762 - Stop printing a cryptic warning when a hidden service gets a
9763 request to connect to a virtual port that it hasn't configured.
9764 Fixes bug 16706; bugfix on 0.2.6.3-alpha.
9765 - Simplify hidden service descriptor creation by using an existing
9766 flag to check if an introduction point is established. Fixes bug
9767 21599; bugfix on 0.2.7.2-alpha.
9769 o Minor bugfixes (link handshake):
9770 - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
9771 months, and regenerate it when it is within one month of expiring.
9772 Previously, we had generated this certificate at startup with a
9773 ten-year lifetime, but that could lead to weird behavior when Tor
9774 was started with a grossly inaccurate clock. Mitigates bug 22466;
9775 mitigation on 0.3.0.1-alpha.
9777 o Minor bugfixes (linux seccomp2 sandbox):
9778 - Avoid a sandbox failure when trying to re-bind to a socket and
9779 mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
9780 - Permit the fchmod system call, to avoid crashing on startup when
9781 starting with the seccomp2 sandbox and an unexpected set of
9782 permissions on the data directory or its contents. Fixes bug
9783 22516; bugfix on 0.2.5.4-alpha.
9785 o Minor bugfixes (logging):
9786 - When decompressing, do not warn if we fail to decompress using a
9787 compression method that we merely guessed. Fixes part of bug
9788 22670; bugfix on 0.1.1.14-alpha.
9789 - When decompressing, treat mismatch between content-encoding and
9790 actual compression type as a protocol warning. Fixes part of bug
9791 22670; bugfix on 0.1.1.9-alpha.
9792 - Downgrade "assigned_to_cpuworker failed" message to info-level
9793 severity. In every case that can reach it, either a better warning
9794 has already been logged, or no warning is warranted. Fixes bug
9795 22356; bugfix on 0.2.6.3-alpha.
9796 - Log a better message when a directory authority replies to an
9797 upload with an unexpected status code. Fixes bug 11121; bugfix
9799 - Downgrade a log statement about unexpected relay cells from "bug"
9800 to "protocol warning", because there is at least one use case
9801 where it can be triggered by a buggy tor implementation. Fixes bug
9802 21293; bugfix on 0.1.1.14-alpha.
9804 o Minor bugfixes (logging, relay):
9805 - Remove a forgotten debugging message when an introduction point
9806 successfully establishes a hidden service prop224 circuit with
9808 - Change three other log_warn() for an introduction point to
9809 protocol warnings, because they can be failure from the network
9810 and are not relevant to the operator. Fixes bug 23078; bugfix on
9811 0.3.0.1-alpha and 0.3.0.2-alpha.
9813 o Minor bugfixes (relay):
9814 - Inform the geoip and rephist modules about all requests, even on
9815 relays that are only fetching microdescriptors. Fixes a bug
9816 related to 21585; bugfix on 0.3.0.1-alpha.
9818 o Minor bugfixes (memory leaks):
9819 - Fix a small memory leak at exit from the backtrace handler code.
9820 Fixes bug 21788; bugfix on 0.2.5.2-alpha. Patch from Daniel Pinto.
9821 - When directory authorities reject a router descriptor due to
9822 keypinning, free the router descriptor rather than leaking the
9823 memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
9824 - Fix a small memory leak when validating a configuration that uses
9825 two or more AF_UNIX sockets for the same port type. Fixes bug
9826 23053; bugfix on 0.2.6.3-alpha. This is CID 1415725.
9828 o Minor bugfixes (process behavior):
9829 - When exiting because of an error, always exit with a nonzero exit
9830 status. Previously, we would fail to report an error in our exit
9831 status in cases related to __OwningControllerProcess failure,
9832 lockfile contention, and Ed25519 key initialization. Fixes bug
9833 22720; bugfix on versions 0.2.1.6-alpha, 0.2.2.28-beta, and
9834 0.2.7.2-alpha respectively. Reported by "f55jwk4f"; patch
9837 o Minor bugfixes (robustness, error handling):
9838 - Improve our handling of the cases where OpenSSL encounters a
9839 memory error while encoding keys and certificates. We haven't
9840 observed these errors in the wild, but if they do happen, we now
9841 detect and respond better. Fixes bug 19418; bugfix on all versions
9842 of Tor. Reported by Guido Vranken.
9844 o Minor bugfixes (testing):
9845 - Fix an undersized buffer in test-memwipe.c. Fixes bug 23291;
9846 bugfix on 0.2.7.2-alpha. Found and patched by Ties Stuij.
9847 - Use unbuffered I/O for utility functions around the
9848 process_handle_t type. This fixes unit test failures reported on
9849 OpenBSD and FreeBSD. Fixes bug 21654; bugfix on 0.2.3.1-alpha.
9850 - Make display of captured unit test log messages consistent. Fixes
9851 bug 21510; bugfix on 0.2.9.3-alpha.
9852 - Make test-network.sh always call chutney's test-network.sh.
9853 Previously, this only worked on systems which had bash installed,
9854 due to some bash-specific code in the script. Fixes bug 19699;
9855 bugfix on 0.3.0.4-rc. Follow-up to ticket 21581.
9856 - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
9857 Fixes bug 22803; bugfix on 0.3.0.1-alpha.
9858 - The unit tests now pass on systems where localhost is misconfigured
9859 to some IPv4 address other than 127.0.0.1. Fixes bug 6298; bugfix
9862 o Minor bugfixes (voting consistency):
9863 - Reject version numbers with non-numeric prefixes (such as +, -, or
9864 whitespace). Disallowing whitespace prevents differential version
9865 parsing between POSIX-based and Windows platforms. Fixes bug 21507
9866 and part of 21508; bugfix on 0.0.8pre1.
9868 o Minor bugfixes (Windows service):
9869 - When running as a Windows service, set the ID of the main thread
9870 correctly. Failure to do so made us fail to send log messages to
9871 the controller in 0.2.1.16-rc, slowed down controller event
9872 delivery in 0.2.7.3-rc and later, and crash with an assertion
9873 failure in 0.3.1.1-alpha. Fixes bug 23081; bugfix on 0.2.1.6-alpha.
9874 Patch and diagnosis from "Vort".
9876 o Minor bugfixes (windows, relay):
9877 - Resolve "Failure from drain_fd: No error" warnings on Windows
9878 relays. Fixes bug 21540; bugfix on 0.2.6.3-alpha.
9880 o Code simplification and refactoring:
9881 - Break up the 630-line function connection_dir_client_reached_eof()
9882 into a dozen smaller functions. This change should help
9883 maintainability and readability of the client directory code.
9884 - Isolate our use of the openssl headers so that they are only
9885 included from our crypto wrapper modules, and from tests that
9886 examine those modules' internals. Closes ticket 21841.
9887 - Simplify our API to launch directory requests, making it more
9888 extensible and less error-prone. Now it's easier to add extra
9889 headers to directory requests. Closes ticket 21646.
9890 - Our base64 decoding functions no longer overestimate the output
9891 space that they need when parsing unpadded inputs. Closes
9893 - Remove unused "ROUTER_ADDED_NOTIFY_GENERATOR" internal value.
9894 Resolves ticket 22213.
9895 - The logic that directory caches use to spool request to clients,
9896 serving them one part at a time so as not to allocate too much
9897 memory, has been refactored for consistency. Previously there was
9898 a separate spooling implementation per type of spoolable data. Now
9899 there is one common spooling implementation, with extensible data
9900 types. Closes ticket 21651.
9901 - Tor's compression module now supports multiple backends. Part of
9902 the implementation for proposal 278; closes ticket 21663.
9905 - Add a manpage description for the key-pinning-journal file. Closes
9907 - Correctly note that bandwidth accounting values are stored in the
9908 state file, and the bw_accounting file is now obsolete. Closes
9910 - Document more of the files in the Tor data directory, including
9911 cached-extrainfo, secret_onion_key{,_ntor}.old, hidserv-stats,
9912 approved-routers, sr-random, and diff-cache. Found while fixing
9914 - Clarify the manpage for the (deprecated) torify script. Closes
9916 - Clarify the behavior of the KeepAliveIsolateSOCKSAuth sub-option.
9917 Closes ticket 21873.
9918 - Correct documentation about the default DataDirectory value.
9919 Closes ticket 21151.
9920 - Document the default behavior of NumEntryGuards and
9921 NumDirectoryGuards correctly. Fixes bug 21715; bugfix
9923 - Document key=value pluggable transport arguments for Bridge lines
9924 in torrc. Fixes bug 20341; bugfix on 0.2.5.1-alpha.
9925 - Note that bandwidth-limiting options don't affect TCP headers or
9926 DNS. Closes ticket 17170.
9928 o Removed features (configuration options, all in ticket 22060):
9929 - These configuration options are now marked Obsolete, and no longer
9930 have any effect: AllowInvalidNodes, AllowSingleHopCircuits,
9931 AllowSingleHopExits, ExcludeSingleHopRelays, FastFirstHopPK,
9932 TLSECGroup, WarnUnsafeSocks. They were first marked as deprecated
9933 in 0.2.9.2-alpha and have now been removed. The previous default
9934 behavior is now always chosen; the previous (less secure) non-
9935 default behavior is now unavailable.
9936 - CloseHSClientCircuitsImmediatelyOnTimeout and
9937 CloseHSServiceRendCircuitsImmediatelyOnTimeout were deprecated in
9938 0.2.9.2-alpha and now have been removed. HS circuits never close
9939 on circuit build timeout; they have a longer timeout period.
9940 - {Control,DNS,Dir,Socks,Trans,NATD,OR}ListenAddress were deprecated
9941 in 0.2.9.2-alpha and now have been removed. Use the ORPort option
9942 (and others) to configure listen-only and advertise-only addresses.
9944 o Removed features (tools):
9945 - We've removed the tor-checkkey tool from src/tools. Long ago, we
9946 used it to help people detect RSA keys that were generated by
9947 versions of Debian affected by CVE-2008-0166. But those keys have
9948 been out of circulation for ages, and this tool is no longer
9949 required. Closes ticket 21842.
9952 Changes in version 0.3.0.10 - 2017-08-02
9953 Tor 0.3.0.10 backports a collection of small-to-medium bugfixes
9954 from the current Tor alpha series. OpenBSD users and TPROXY users
9955 should upgrade; others are probably okay sticking with 0.3.0.9.
9957 o Major features (build system, continuous integration, backport from 0.3.1.5-alpha):
9958 - Tor's repository now includes a Travis Continuous Integration (CI)
9959 configuration file (.travis.yml). This is meant to help new
9960 developers and contributors who fork Tor to a Github repository be
9961 better able to test their changes, and understand what we expect
9962 to pass. To use this new build feature, you must fork Tor to your
9963 Github account, then go into the "Integrations" menu in the
9964 repository settings for your fork and enable Travis, then push
9965 your changes. Closes ticket 22636.
9967 o Major bugfixes (linux TPROXY support, backport from 0.3.1.1-alpha):
9968 - Fix a typo that had prevented TPROXY-based transparent proxying
9969 from working under Linux. Fixes bug 18100; bugfix on 0.2.6.3-alpha.
9970 Patch from "d4fq0fQAgoJ".
9972 o Major bugfixes (openbsd, denial-of-service, backport from 0.3.1.5-alpha):
9973 - Avoid an assertion failure bug affecting our implementation of
9974 inet_pton(AF_INET6) on certain OpenBSD systems whose strtol()
9975 handling of "0xbar" differs from what we had expected. Fixes bug
9976 22789; bugfix on 0.2.3.8-alpha. Also tracked as TROVE-2017-007.
9978 o Minor features (backport from 0.3.1.5-alpha):
9979 - Update geoip and geoip6 to the July 4 2017 Maxmind GeoLite2
9982 o Minor bugfixes (bandwidth accounting, backport from 0.3.1.2-alpha):
9983 - Roll over monthly accounting at the configured hour and minute,
9984 rather than always at 00:00. Fixes bug 22245; bugfix on 0.0.9rc1.
9985 Found by Andrey Karpov with PVS-Studio.
9987 o Minor bugfixes (compilation warnings, backport from 0.3.1.5-alpha):
9988 - Suppress -Wdouble-promotion warnings with clang 4.0. Fixes bug 22915;
9989 bugfix on 0.2.8.1-alpha.
9990 - Fix warnings when building with libscrypt and openssl scrypt
9991 support on Clang. Fixes bug 22916; bugfix on 0.2.7.2-alpha.
9992 - When building with certain versions of the mingw C header files,
9993 avoid float-conversion warnings when calling the C functions
9994 isfinite(), isnan(), and signbit(). Fixes bug 22801; bugfix
9997 o Minor bugfixes (compilation, mingw, backport from 0.3.1.1-alpha):
9998 - Backport a fix for an "unused variable" warning that appeared
9999 in some versions of mingw. Fixes bug 22838; bugfix on
10002 o Minor bugfixes (coverity build support, backport from 0.3.1.5-alpha):
10003 - Avoid Coverity build warnings related to our BUG() macro. By
10004 default, Coverity treats BUG() as the Linux kernel does: an
10005 instant abort(). We need to override that so our BUG() macro
10006 doesn't prevent Coverity from analyzing functions that use it.
10007 Fixes bug 23030; bugfix on 0.2.9.1-alpha.
10009 o Minor bugfixes (directory authority, backport from 0.3.1.1-alpha):
10010 - When rejecting a router descriptor for running an obsolete version
10011 of Tor without ntor support, warn about the obsolete tor version,
10012 not the missing ntor key. Fixes bug 20270; bugfix on 0.2.9.3-alpha.
10014 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.5-alpha):
10015 - Avoid a sandbox failure when trying to re-bind to a socket and
10016 mark it as IPv6-only. Fixes bug 20247; bugfix on 0.2.5.1-alpha.
10018 o Minor bugfixes (unit tests, backport from 0.3.1.5-alpha)
10019 - Fix a memory leak in the link-handshake/certs_ok_ed25519 test.
10020 Fixes bug 22803; bugfix on 0.3.0.1-alpha.
10023 Changes in version 0.3.0.9 - 2017-06-29
10024 Tor 0.3.0.9 fixes a path selection bug that would allow a client
10025 to use a guard that was in the same network family as a chosen exit
10026 relay. This is a security regression; all clients running earlier
10027 versions of 0.3.0.x or 0.3.1.x should upgrade to 0.3.0.9 or
10030 This release also backports several other bugfixes from the 0.3.1.x
10033 o Major bugfixes (path selection, security, backport from 0.3.1.4-alpha):
10034 - When choosing which guard to use for a circuit, avoid the exit's
10035 family along with the exit itself. Previously, the new guard
10036 selection logic avoided the exit, but did not consider its family.
10037 Fixes bug 22753; bugfix on 0.3.0.1-alpha. Tracked as TROVE-2017-
10038 006 and CVE-2017-0377.
10040 o Major bugfixes (entry guards, backport from 0.3.1.1-alpha):
10041 - Don't block bootstrapping when a primary bridge is offline and we
10042 can't get its descriptor. Fixes bug 22325; fixes one case of bug
10043 21969; bugfix on 0.3.0.3-alpha.
10045 o Major bugfixes (entry guards, backport from 0.3.1.4-alpha):
10046 - When starting with an old consensus, do not add new entry guards
10047 unless the consensus is "reasonably live" (under 1 day old). Fixes
10048 one root cause of bug 22400; bugfix on 0.3.0.1-alpha.
10050 o Minor features (geoip):
10051 - Update geoip and geoip6 to the June 8 2017 Maxmind GeoLite2
10054 o Minor bugfixes (voting consistency, backport from 0.3.1.1-alpha):
10055 - Reject version numbers with non-numeric prefixes (such as +, -, or
10056 whitespace). Disallowing whitespace prevents differential version
10057 parsing between POSIX-based and Windows platforms. Fixes bug 21507
10058 and part of 21508; bugfix on 0.0.8pre1.
10060 o Minor bugfixes (linux seccomp2 sandbox, backport from 0.3.1.4-alpha):
10061 - Permit the fchmod system call, to avoid crashing on startup when
10062 starting with the seccomp2 sandbox and an unexpected set of
10063 permissions on the data directory or its contents. Fixes bug
10064 22516; bugfix on 0.2.5.4-alpha.
10066 o Minor bugfixes (defensive programming, backport from 0.3.1.4-alpha):
10067 - Fix a memset() off the end of an array when packing cells. This
10068 bug should be harmless in practice, since the corrupted bytes are
10069 still in the same structure, and are always padding bytes,
10070 ignored, or immediately overwritten, depending on compiler
10071 behavior. Nevertheless, because the memset()'s purpose is to make
10072 sure that any other cell-handling bugs can't expose bytes to the
10073 network, we need to fix it. Fixes bug 22737; bugfix on
10074 0.2.4.11-alpha. Fixes CID 1401591.
10077 Changes in version 0.3.0.8 - 2017-06-08
10078 Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
10079 remotely crash a hidden service with an assertion failure. Anyone
10080 running a hidden service should upgrade to this version, or to some
10081 other version with fixes for TROVE-2017-004 and TROVE-2017-005.
10083 Tor 0.3.0.8 also includes fixes for several key management bugs
10084 that sometimes made relays unreliable, as well as several other
10085 bugfixes described below.
10087 o Major bugfixes (hidden service, relay, security, backport
10088 from 0.3.1.3-alpha):
10089 - Fix a remotely triggerable assertion failure when a hidden service
10090 handles a malformed BEGIN cell. Fixes bug 22493, tracked as
10091 TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
10092 - Fix a remotely triggerable assertion failure caused by receiving a
10093 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10094 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10097 o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
10098 - When performing the v3 link handshake on a TLS connection, report
10099 that we have the x509 certificate that we actually used on that
10100 connection, even if we have changed certificates since that
10101 connection was first opened. Previously, we would claim to have
10102 used our most recent x509 link certificate, which would sometimes
10103 make the link handshake fail. Fixes one case of bug 22460; bugfix
10106 o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
10107 - Regenerate link and authentication certificates whenever the key
10108 that signs them changes; also, regenerate link certificates
10109 whenever the signed key changes. Previously, these processes were
10110 only weakly coupled, and we relays could (for minutes to hours)
10111 wind up with an inconsistent set of keys and certificates, which
10112 other relays would not accept. Fixes two cases of bug 22460;
10113 bugfix on 0.3.0.1-alpha.
10114 - When sending an Ed25519 signing->link certificate in a CERTS cell,
10115 send the certificate that matches the x509 certificate that we
10116 used on the TLS connection. Previously, there was a race condition
10117 if the TLS context rotated after we began the TLS handshake but
10118 before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
10121 o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
10122 - Stop rejecting v3 hidden service descriptors because their size
10123 did not match an old padding rule. Fixes bug 22447; bugfix on
10126 o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
10127 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
10128 December 2016 (of which ~126 were still functional) with a list of
10129 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
10130 2017. Resolves ticket 21564.
10132 o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
10133 - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
10134 bug 22252; bugfix on 0.2.9.3-alpha.
10136 o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
10137 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10138 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10140 o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
10141 - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
10142 months, and regenerate it when it is within one month of expiring.
10143 Previously, we had generated this certificate at startup with a
10144 ten-year lifetime, but that could lead to weird behavior when Tor
10145 was started with a grossly inaccurate clock. Mitigates bug 22466;
10146 mitigation on 0.3.0.1-alpha.
10148 o Minor bugfixes (memory leak, directory authority, backport from
10150 - When directory authorities reject a router descriptor due to
10151 keypinning, free the router descriptor rather than leaking the
10152 memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
10155 Changes in version 0.2.9.11 - 2017-06-08
10156 Tor 0.2.9.11 backports a fix for a bug that would allow an attacker to
10157 remotely crash a hidden service with an assertion failure. Anyone
10158 running a hidden service should upgrade to this version, or to some
10159 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
10160 are not affected by TROVE-2017-004.)
10162 Tor 0.2.9.11 also backports fixes for several key management bugs
10163 that sometimes made relays unreliable, as well as several other
10164 bugfixes described below.
10166 o Major bugfixes (hidden service, relay, security, backport
10167 from 0.3.1.3-alpha):
10168 - Fix a remotely triggerable assertion failure caused by receiving a
10169 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10170 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10173 o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
10174 - When performing the v3 link handshake on a TLS connection, report
10175 that we have the x509 certificate that we actually used on that
10176 connection, even if we have changed certificates since that
10177 connection was first opened. Previously, we would claim to have
10178 used our most recent x509 link certificate, which would sometimes
10179 make the link handshake fail. Fixes one case of bug 22460; bugfix
10182 o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
10183 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
10184 December 2016 (of which ~126 were still functional) with a list of
10185 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
10186 2017. Resolves ticket 21564.
10188 o Minor features (future-proofing, backport from 0.3.0.7):
10189 - Tor no longer refuses to download microdescriptors or descriptors if
10190 they are listed as "published in the future". This change will
10191 eventually allow us to stop listing meaningful "published" dates
10192 in microdescriptor consensuses, and thereby allow us to reduce the
10193 resources required to download consensus diffs by over 50%.
10194 Implements part of ticket 21642; implements part of proposal 275.
10196 o Minor features (directory authorities, backport from 0.3.0.4-rc)
10197 - Directory authorities now reject relays running versions
10198 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
10199 suffer from bug 20499 and don't keep their consensus cache
10200 up-to-date. Resolves ticket 20509.
10202 o Minor features (geoip):
10203 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10206 o Minor bugfixes (control port, backport from 0.3.0.6):
10207 - The GETINFO extra-info/digest/<digest> command was broken because
10208 of a wrong base16 decode return value check, introduced when
10209 refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
10211 o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
10212 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10213 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10215 o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
10216 - The getpid() system call is now permitted under the Linux seccomp2
10217 sandbox, to avoid crashing with versions of OpenSSL (and other
10218 libraries) that attempt to learn the process's PID by using the
10219 syscall rather than the VDSO code. Fixes bug 21943; bugfix
10222 o Minor bugfixes (memory leak, directory authority, backport
10223 from 0.3.1.2-alpha):
10224 - When directory authorities reject a router descriptor due to
10225 keypinning, free the router descriptor rather than leaking the
10226 memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
10228 Changes in version 0.2.8.14 - 2017-06-08
10229 Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
10230 remotely crash a hidden service with an assertion failure. Anyone
10231 running a hidden service should upgrade to this version, or to some
10232 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
10233 are not affected by TROVE-2017-004.)
10235 o Major bugfixes (hidden service, relay, security):
10236 - Fix a remotely triggerable assertion failure caused by receiving a
10237 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10238 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10241 o Minor features (geoip):
10242 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10245 o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
10246 - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
10247 December 2016 (of which ~126 were still functional) with a list of
10248 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
10249 2017. Resolves ticket 21564.
10251 o Minor bugfixes (correctness):
10252 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10253 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10255 Changes in version 0.2.7.8 - 2017-06-08
10256 Tor 0.2.7.8 backports a fix for a bug that would allow an attacker to
10257 remotely crash a hidden service with an assertion failure. Anyone
10258 running a hidden service should upgrade to this version, or to some
10259 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
10260 are not affected by TROVE-2017-004.)
10262 o Major bugfixes (hidden service, relay, security):
10263 - Fix a remotely triggerable assertion failure caused by receiving a
10264 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10265 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10268 o Minor features (geoip):
10269 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10272 o Minor bugfixes (correctness):
10273 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10274 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10277 Changes in version 0.2.6.12 - 2017-06-08
10278 Tor 0.2.6.12 backports a fix for a bug that would allow an attacker to
10279 remotely crash a hidden service with an assertion failure. Anyone
10280 running a hidden service should upgrade to this version, or to some
10281 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
10282 are not affected by TROVE-2017-004.)
10284 o Major bugfixes (hidden service, relay, security):
10285 - Fix a remotely triggerable assertion failure caused by receiving a
10286 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10287 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10290 o Minor features (geoip):
10291 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10294 o Minor bugfixes (correctness):
10295 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10296 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10298 Changes in version 0.2.5.14 - 2017-06-08
10299 Tor 0.2.5.14 backports a fix for a bug that would allow an attacker to
10300 remotely crash a hidden service with an assertion failure. Anyone
10301 running a hidden service should upgrade to this version, or to some
10302 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
10303 are not affected by TROVE-2017-004.)
10305 o Major bugfixes (hidden service, relay, security):
10306 - Fix a remotely triggerable assertion failure caused by receiving a
10307 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10308 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10311 o Minor features (geoip):
10312 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10315 o Minor bugfixes (correctness):
10316 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10317 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10319 Changes in version 0.2.4.29 - 2017-06-08
10320 Tor 0.2.4.29 backports a fix for a bug that would allow an attacker to
10321 remotely crash a hidden service with an assertion failure. Anyone
10322 running a hidden service should upgrade to this version, or to some
10323 other version with fixes for TROVE-2017-005. (Versions before 0.3.0
10324 are not affected by TROVE-2017-004.)
10326 o Major bugfixes (hidden service, relay, security):
10327 - Fix a remotely triggerable assertion failure caused by receiving a
10328 BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
10329 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
10332 o Minor features (geoip):
10333 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10336 o Minor bugfixes (correctness):
10337 - Avoid undefined behavior when parsing IPv6 entries from the geoip6
10338 file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
10341 Changes in version 0.3.0.7 - 2017-05-15
10342 Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
10343 of Tor 0.3.0.x, where an attacker could cause a Tor relay process
10344 to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
10345 clients are not affected.
10347 o Major bugfixes (hidden service directory, security):
10348 - Fix an assertion failure in the hidden service directory code, which
10349 could be used by an attacker to remotely cause a Tor relay process to
10350 exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
10351 should upgrade. This security issue is tracked as TROVE-2017-002.
10352 Fixes bug 22246; bugfix on 0.3.0.1-alpha.
10355 - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
10358 o Minor features (future-proofing):
10359 - Tor no longer refuses to download microdescriptors or descriptors
10360 if they are listed as "published in the future". This change will
10361 eventually allow us to stop listing meaningful "published" dates
10362 in microdescriptor consensuses, and thereby allow us to reduce the
10363 resources required to download consensus diffs by over 50%.
10364 Implements part of ticket 21642; implements part of proposal 275.
10366 o Minor bugfixes (Linux seccomp2 sandbox):
10367 - The getpid() system call is now permitted under the Linux seccomp2
10368 sandbox, to avoid crashing with versions of OpenSSL (and other
10369 libraries) that attempt to learn the process's PID by using the
10370 syscall rather than the VDSO code. Fixes bug 21943; bugfix
10374 Changes in version 0.3.0.6 - 2017-04-26
10375 Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
10377 With the 0.3.0 series, clients and relays now use Ed25519 keys to
10378 authenticate their link connections to relays, rather than the old
10379 RSA1024 keys that they used before. (Circuit crypto has been
10380 Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
10381 the guard selection and replacement algorithm to behave more robustly
10382 in the presence of unreliable networks, and to resist guard-
10385 This series also includes numerous other small features and bugfixes,
10386 along with more groundwork for the upcoming hidden-services revamp.
10388 Per our stable release policy, we plan to support the Tor 0.3.0
10389 release series for at least the next nine months, or for three months
10390 after the first stable release of the 0.3.1 series: whichever is
10391 longer. If you need a release with long-term support, we recommend
10392 that you stay with the 0.2.9 series.
10394 Below are the changes since 0.2.9.10. For a list of only the changes
10395 since 0.3.0.5-rc, see the ChangeLog file.
10397 o Major features (directory authority, security):
10398 - The default for AuthDirPinKeys is now 1: directory authorities
10399 will reject relays where the RSA identity key matches a previously
10400 seen value, but the Ed25519 key has changed. Closes ticket 18319.
10402 o Major features (guard selection algorithm):
10403 - Tor's guard selection algorithm has been redesigned from the
10404 ground up, to better support unreliable networks and restrictive
10405 sets of entry nodes, and to better resist guard-capture attacks by
10406 hostile local networks. Implements proposal 271; closes
10409 o Major features (next-generation hidden services):
10410 - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
10411 prop224 aka "Next Generation Hidden Services". Service and clients
10412 don't use this functionality yet. Closes ticket 19043. Based on
10413 initial code by Alec Heifetz.
10414 - Relays now support the HSDir version 3 protocol, so that they can
10415 can store and serve v3 descriptors. This is part of the next-
10416 generation onion service work detailed in proposal 224. Closes
10419 o Major features (protocol, ed25519 identity keys):
10420 - Clients now support including Ed25519 identity keys in the EXTEND2
10421 cells they generate. By default, this is controlled by a consensus
10422 parameter, currently disabled. You can turn this feature on for
10423 testing by setting ExtendByEd25519ID in your configuration. This
10424 might make your traffic appear different than the traffic
10425 generated by other users, however. Implements part of ticket
10426 15056; part of proposal 220.
10427 - Relays now understand requests to extend to other relays by their
10428 Ed25519 identity keys. When an Ed25519 identity key is included in
10429 an EXTEND2 cell, the relay will only extend the circuit if the
10430 other relay can prove ownership of that identity. Implements part
10431 of ticket 15056; part of proposal 220.
10432 - Relays now use Ed25519 to prove their Ed25519 identities and to
10433 one another, and to clients. This algorithm is faster and more
10434 secure than the RSA-based handshake we've been doing until now.
10435 Implements the second big part of proposal 220; Closes
10438 o Major features (security):
10439 - Change the algorithm used to decide DNS TTLs on client and server
10440 side, to better resist DNS-based correlation attacks like the
10441 DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
10442 Feamster. Now relays only return one of two possible DNS TTL
10443 values, and clients are willing to believe DNS TTL values up to 3
10444 hours long. Closes ticket 19769.
10446 o Major bugfixes (client, onion service, also in 0.2.9.9):
10447 - Fix a client-side onion service reachability bug, where multiple
10448 socks requests to an onion service (or a single slow request)
10449 could cause us to mistakenly mark some of the service's
10450 introduction points as failed, and we cache that failure so
10451 eventually we run out and can't reach the service. Also resolves a
10452 mysterious "Remote server sent bogus reason code 65021" log
10453 warning. The bug was introduced in ticket 17218, where we tried to
10454 remember the circuit end reason as a uint16_t, which mangled
10455 negative values. Partially fixes bug 21056 and fixes bug 20307;
10456 bugfix on 0.2.8.1-alpha.
10458 o Major bugfixes (crash, directory connections):
10459 - Fix a rare crash when sending a begin cell on a circuit whose
10460 linked directory connection had already been closed. Fixes bug
10461 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
10463 o Major bugfixes (directory authority):
10464 - During voting, when marking a relay as a probable sybil, do not
10465 clear its BadExit flag: sybils can still be bad in other ways
10466 too. (We still clear the other flags.) Fixes bug 21108; bugfix
10469 o Major bugfixes (DNS):
10470 - Fix a bug that prevented exit nodes from caching DNS records for
10471 more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
10473 o Major bugfixes (IPv6 Exits):
10474 - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
10475 any IPv6 addresses. Instead, only reject a port over IPv6 if the
10476 exit policy rejects that port on more than an IPv6 /16 of
10477 addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
10478 which rejected a relay's own IPv6 address by default. Fixes bug
10479 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
10481 o Major bugfixes (parsing):
10482 - Fix an integer underflow bug when comparing malformed Tor
10483 versions. This bug could crash Tor when built with
10484 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
10485 0.2.9.8, which were built with -ftrapv by default. In other cases
10486 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
10487 on 0.0.8pre1. Found by OSS-Fuzz.
10488 - When parsing a malformed content-length field from an HTTP
10489 message, do not read off the end of the buffer. This bug was a
10490 potential remote denial-of-service attack against Tor clients and
10491 relays. A workaround was released in October 2016, to prevent this
10492 bug from crashing Tor. This is a fix for the underlying issue,
10493 which should no longer matter (if you applied the earlier patch).
10494 Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
10495 using AFL (http://lcamtuf.coredump.cx/afl/).
10497 o Major bugfixes (scheduler):
10498 - Actually compare circuit policies in ewma_cmp_cmux(). This bug
10499 caused the channel scheduler to behave more or less randomly,
10500 rather than preferring channels with higher-priority circuits.
10501 Fixes bug 20459; bugfix on 0.2.6.2-alpha.
10503 o Major bugfixes (security, also in 0.2.9.9):
10504 - Downgrade the "-ftrapv" option from "always on" to "only on when
10505 --enable-expensive-hardening is provided." This hardening option,
10506 like others, can turn survivable bugs into crashes--and having it
10507 on by default made a (relatively harmless) integer overflow bug
10508 into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
10509 bugfix on 0.2.9.1-alpha.
10511 o Minor feature (client):
10512 - Enable IPv6 traffic on the SocksPort by default. To disable this,
10513 a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
10515 o Minor feature (fallback scripts):
10516 - Add a check_existing mode to updateFallbackDirs.py, which checks
10517 if fallbacks in the hard-coded list are working. Closes ticket
10518 20174. Patch by haxxpop.
10520 o Minor feature (protocol versioning):
10521 - Add new protocol version for proposal 224. HSIntro now advertises
10522 version "3-4" and HSDir version "1-2". Fixes ticket 20656.
10524 o Minor features (ciphersuite selection):
10525 - Allow relays to accept a wider range of ciphersuites, including
10526 chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
10527 - Clients now advertise a list of ciphersuites closer to the ones
10528 preferred by Firefox. Closes part of ticket 15426.
10530 o Minor features (controller):
10531 - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
10532 shared-random values to the controller. Closes ticket 19925.
10533 - When HSFETCH arguments cannot be parsed, say "Invalid argument"
10534 rather than "unrecognized." Closes ticket 20389; patch from
10537 o Minor features (controller, configuration):
10538 - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
10539 and so on, now comes with a __*Port variant that will not be saved
10540 to the torrc file by the controller's SAVECONF command. This
10541 change allows TorBrowser to set up a single-use domain socket for
10542 each time it launches Tor. Closes ticket 20956.
10543 - The GETCONF command can now query options that may only be
10544 meaningful in context-sensitive lists. This allows the controller
10545 to query the mixed SocksPort/__SocksPort style options introduced
10546 in feature 20956. Implements ticket 21300.
10548 o Minor features (diagnostic, directory client):
10549 - Warn when we find an unexpected inconsistency in directory
10550 download status objects. Prevents some negative consequences of
10553 o Minor features (directory authorities):
10554 - Directory authorities now reject descriptors that claim to be
10555 malformed versions of Tor. Helps prevent exploitation of
10557 - Reject version numbers with components that exceed INT32_MAX.
10558 Otherwise 32-bit and 64-bit platforms would behave inconsistently.
10559 Fixes bug 21450; bugfix on 0.0.8pre1.
10561 o Minor features (directory authority):
10562 - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
10563 default) to control whether authorities should try to probe relays
10564 by their Ed25519 link keys. This option will go away in a few
10565 releases--unless we encounter major trouble in our ed25519 link
10566 protocol rollout, in which case it will serve as a safety option.
10568 o Minor features (directory cache):
10569 - Relays and bridges will now refuse to serve the consensus they
10570 have if they know it is too old for a client to use. Closes
10573 o Minor features (ed25519 link handshake):
10574 - Advertise support for the ed25519 link handshake using the
10575 subprotocol-versions mechanism, so that clients can tell which
10576 relays can identity themselves by Ed25519 ID. Closes ticket 20552.
10578 o Minor features (entry guards):
10579 - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
10580 break regression tests.
10581 - Require UseEntryGuards when UseBridges is set, in order to make
10582 sure bridges aren't bypassed. Resolves ticket 20502.
10584 o Minor features (fallback directories):
10585 - Allow 3 fallback relays per operator, which is safe now that we
10586 are choosing 200 fallback relays. Closes ticket 20912.
10587 - Annotate updateFallbackDirs.py with the bandwidth and consensus
10588 weight for each candidate fallback. Closes ticket 20878.
10589 - Display the relay fingerprint when downloading consensuses from
10590 fallbacks. Closes ticket 20908.
10591 - Exclude relays affected by bug 20499 from the fallback list.
10592 Exclude relays from the fallback list if they are running versions
10593 known to be affected by bug 20499, or if in our tests they deliver
10594 a stale consensus (i.e. one that expired more than 24 hours ago).
10595 Closes ticket 20539.
10596 - Make it easier to change the output sort order of fallbacks.
10597 Closes ticket 20822.
10598 - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
10600 - Require fallback directories to have the same address and port for
10601 7 days (now that we have enough relays with this stability).
10602 Relays whose OnionOO stability timer is reset on restart by bug
10603 18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
10604 this issue. Closes ticket 20880; maintains short-term fix
10606 - Require fallbacks to have flags for 90% of the time (weighted
10607 decaying average), rather than 95%. This allows at least 73% of
10608 clients to bootstrap in the first 5 seconds without contacting an
10609 authority. Part of ticket 18828.
10610 - Select 200 fallback directories for each release. Closes
10613 o Minor features (fingerprinting resistance, authentication):
10614 - Extend the length of RSA keys used for TLS link authentication to
10615 2048 bits. (These weren't used for forward secrecy; for forward
10616 secrecy, we used P256.) Closes ticket 13752.
10618 o Minor features (geoip):
10619 - Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
10622 o Minor features (geoip, also in 0.2.9.9):
10623 - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
10626 o Minor features (infrastructure):
10627 - Implement smartlist_add_strdup() function. Replaces the use of
10628 smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
10630 o Minor features (linting):
10631 - Enhance the changes file linter to warn on Tor versions that are
10632 prefixed with "tor-". Closes ticket 21096.
10634 o Minor features (logging):
10635 - In several places, describe unset ed25519 keys as "<unset>",
10636 rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
10638 o Minor features (portability, compilation):
10639 - Autoconf now checks to determine if OpenSSL structures are opaque,
10640 instead of explicitly checking for OpenSSL version numbers. Part
10642 - Support building with recent LibreSSL code that uses opaque
10643 structures. Closes ticket 21359.
10645 o Minor features (relay):
10646 - We now allow separation of exit and relay traffic to different
10647 source IP addresses, using the OutboundBindAddressExit and
10648 OutboundBindAddressOR options respectively. Closes ticket 17975.
10649 Written by Michael Sonntag.
10651 o Minor features (reliability, crash):
10652 - Try better to detect problems in buffers where they might grow (or
10653 think they have grown) over 2 GB in size. Diagnostic for
10656 o Minor features (testing):
10657 - During 'make test-network-all', if tor logs any warnings, ask
10658 chutney to output them. Requires a recent version of chutney with
10659 the 21572 patch. Implements 21570.
10661 o Minor bugfix (control protocol):
10662 - The reply to a "GETINFO config/names" request via the control
10663 protocol now spells the type "Dependent" correctly. This is a
10664 breaking change in the control protocol. (The field seems to be
10665 ignored by the most common known controllers.) Fixes bug 18146;
10666 bugfix on 0.1.1.4-alpha.
10667 - The GETINFO extra-info/digest/<digest> command was broken because
10668 of a wrong base16 decode return value check, introduced when
10669 refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
10671 o Minor bugfix (logging):
10672 - Don't recommend the use of Tor2web in non-anonymous mode.
10673 Recommending Tor2web is a bad idea because the client loses all
10674 anonymity. Tor2web should only be used in specific cases by users
10675 who *know* and understand the issues. Fixes bug 21294; bugfix
10678 o Minor bugfixes (bug resilience):
10679 - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
10680 19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
10681 Hans Jerry Illikainen.
10683 o Minor bugfixes (build):
10684 - Replace obsolete Autoconf macros with their modern equivalent and
10685 prevent similar issues in the future. Fixes bug 20990; bugfix
10688 o Minor bugfixes (certificate expiration time):
10689 - Avoid using link certificates that don't become valid till some
10690 time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
10692 o Minor bugfixes (client):
10693 - Always recover from failures in extend_info_from_node(), in an
10694 attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
10695 bugfix on 0.2.3.1-alpha.
10696 - When clients that use bridges start up with a cached consensus on
10697 disk, they were ignoring it and downloading a new one. Now they
10698 use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
10700 o Minor bugfixes (code correctness):
10701 - Repair a couple of (unreachable or harmless) cases of the risky
10702 comparison-by-subtraction pattern that caused bug 21278.
10704 o Minor bugfixes (config):
10705 - Don't assert on startup when trying to get the options list and
10706 LearnCircuitBuildTimeout is set to 0: we are currently parsing the
10707 options so of course they aren't ready yet. Fixes bug 21062;
10708 bugfix on 0.2.9.3-alpha.
10710 o Minor bugfixes (configuration):
10711 - Accept non-space whitespace characters after the severity level in
10712 the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
10713 - Support "TByte" and "TBytes" units in options given in bytes.
10714 "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
10715 supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
10717 o Minor bugfixes (configure, autoconf):
10718 - Rename the configure option --enable-expensive-hardening to
10719 --enable-fragile-hardening. Expensive hardening makes the tor
10720 daemon abort when some kinds of issues are detected. Thus, it
10721 makes tor more at risk of remote crashes but safer against RCE or
10722 heartbleed bug category. We now try to explain this issue in a
10723 message from the configure script. Fixes bug 21290; bugfix
10726 o Minor bugfixes (consensus weight):
10727 - Add new consensus method that initializes bw weights to 1 instead
10728 of 0. This prevents a zero weight from making it all the way to
10729 the end (happens in small testing networks) and causing an error.
10730 Fixes bug 14881; bugfix on 0.2.2.17-alpha.
10732 o Minor bugfixes (crash prevention):
10733 - Fix an (currently untriggerable, but potentially dangerous) crash
10734 bug when base32-encoding inputs whose sizes are not a multiple of
10735 5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
10737 o Minor bugfixes (dead code):
10738 - Remove a redundant check for PidFile changes at runtime in
10739 options_transition_allowed(): this check is already performed
10740 regardless of whether the sandbox is active. Fixes bug 21123;
10741 bugfix on 0.2.5.4-alpha.
10743 o Minor bugfixes (descriptors):
10744 - Correctly recognise downloaded full descriptors as valid, even
10745 when using microdescriptors as circuits. This affects clients with
10746 FetchUselessDescriptors set, and may affect directory authorities.
10747 Fixes bug 20839; bugfix on 0.2.3.2-alpha.
10749 o Minor bugfixes (directory mirrors):
10750 - Allow relays to use directory mirrors without a DirPort: these
10751 relays need to be contacted over their ORPorts using a begindir
10752 connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
10753 - Clarify the message logged when a remote relay is unexpectedly
10754 missing an ORPort or DirPort: users were confusing this with a
10755 local port. Fixes another case of bug 20711; bugfix
10758 o Minor bugfixes (directory system):
10759 - Bridges and relays now use microdescriptors (like clients do)
10760 rather than old-style router descriptors. Now bridges will blend
10761 in with clients in terms of the circuits they build. Fixes bug
10762 6769; bugfix on 0.2.3.2-alpha.
10763 - Download all consensus flavors, descriptors, and authority
10764 certificates when FetchUselessDescriptors is set, regardless of
10765 whether tor is a directory cache or not. Fixes bug 20667; bugfix
10766 on all recent tor versions.
10768 o Minor bugfixes (documentation):
10769 - Update the tor manual page to document every option that can not
10770 be changed while tor is running. Fixes bug 21122.
10772 o Minor bugfixes (ed25519 certificates):
10773 - Correctly interpret ed25519 certificates that would expire some
10774 time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
10776 o Minor bugfixes (fallback directories):
10777 - Avoid checking fallback candidates' DirPorts if they are down in
10778 OnionOO. When a relay operator has multiple relays, this
10779 prioritizes relays that are up over relays that are down. Fixes
10780 bug 20926; bugfix on 0.2.8.3-alpha.
10781 - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
10782 Fixes bug 20877; bugfix on 0.2.8.3-alpha.
10783 - Stop failing when a relay has no uptime data in
10784 updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
10786 o Minor bugfixes (hidden service):
10787 - Clean up the code for expiring intro points with no associated
10788 circuits. It was causing, rarely, a service with some expiring
10789 introduction points to not open enough additional introduction
10790 points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
10791 - Resolve two possible underflows which could lead to creating and
10792 closing a lot of introduction point circuits in a non-stop loop.
10793 Fixes bug 21302; bugfix on 0.2.7.2-alpha.
10794 - Stop setting the torrc option HiddenServiceStatistics to "0" just
10795 because we're not a bridge or relay. Instead, we preserve whatever
10796 value the user set (or didn't set). Fixes bug 21150; bugfix
10799 o Minor bugfixes (hidden services):
10800 - Make hidden services check for failed intro point connections,
10801 even when they have exceeded their intro point creation limit.
10802 Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
10803 - Make hidden services with 8 to 10 introduction points check for
10804 failed circuits immediately after startup. Previously, they would
10805 wait for 5 minutes before performing their first checks. Fixes bug
10806 21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
10807 - Stop ignoring misconfigured hidden services. Instead, refuse to
10808 start tor until the misconfigurations have been corrected. Fixes
10809 bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
10812 o Minor bugfixes (IPv6):
10813 - Make IPv6-using clients try harder to find an IPv6 directory
10814 server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
10815 - When IPv6 addresses have not been downloaded yet (microdesc
10816 consensus documents don't list relay IPv6 addresses), use hard-
10817 coded addresses for authorities, fallbacks, and configured
10818 bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
10819 20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
10821 o Minor bugfixes (memory leak at exit):
10822 - Fix a small harmless memory leak at exit of the previously unused
10823 RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
10826 o Minor bugfixes (onion services):
10827 - Allow the number of introduction points to be as low as 0, rather
10828 than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
10830 o Minor bugfixes (portability):
10831 - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
10832 It is supported by OpenBSD itself, and also by most OpenBSD
10833 variants (such as Bitrig). Fixes bug 20980; bugfix
10836 o Minor bugfixes (portability, also in 0.2.9.9):
10837 - Avoid crashing when Tor is built using headers that contain
10838 CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
10839 without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
10841 - Fix Libevent detection on platforms without Libevent 1 headers
10842 installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
10844 o Minor bugfixes (relay):
10845 - Avoid a double-marked-circuit warning that could happen when we
10846 receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
10848 - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
10849 initializing the keys would reset the DataDirectory to 0700
10850 instead of 0750 even if DataDirectoryGroupReadable was set to 1.
10851 Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
10853 o Minor bugfixes (testing):
10854 - Fix Raspbian build issues related to missing socket errno in
10855 test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch by "hein".
10856 - Remove undefined behavior from the backtrace generator by removing
10857 its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
10858 - Use bash in src/test/test-network.sh. This ensures we reliably
10859 call chutney's newer tools/test-network.sh when available. Fixes
10860 bug 21562; bugfix on 0.2.9.1-alpha.
10862 o Minor bugfixes (tor-resolve):
10863 - The tor-resolve command line tool now rejects hostnames over 255
10864 characters in length. Previously, it would silently truncate them,
10865 which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
10866 Patch by "junglefowl".
10868 o Minor bugfixes (unit tests):
10869 - Allow the unit tests to pass even when DNS lookups of bogus
10870 addresses do not fail as expected. Fixes bug 20862 and 20863;
10871 bugfix on unit tests introduced in 0.2.8.1-alpha
10872 through 0.2.9.4-alpha.
10874 o Minor bugfixes (util):
10875 - When finishing writing a file to disk, if we were about to replace
10876 the file with the temporary file created before and we fail to
10877 replace it, remove the temporary file so it doesn't stay on disk.
10878 Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
10880 o Minor bugfixes (Windows services):
10881 - Be sure to initialize the monotonic time subsystem before using
10882 it, even when running as an NT service. Fixes bug 21356; bugfix
10885 o Minor bugfixes (Windows):
10886 - Check for getpagesize before using it to mmap files. This fixes
10887 compilation in some MinGW environments. Fixes bug 20530; bugfix on
10888 0.1.2.1-alpha. Reported by "ice".
10890 o Code simplification and refactoring:
10891 - Abolish all global guard context in entrynodes.c; replace with new
10892 guard_selection_t structure as preparation for proposal 271.
10893 Closes ticket 19858.
10894 - Extract magic numbers in circuituse.c into defined variables.
10895 - Introduce rend_service_is_ephemeral() that tells if given onion
10896 service is ephemeral. Replace unclear NULL-checkings for service
10897 directory with this function. Closes ticket 20526.
10898 - Refactor circuit_is_available_for_use to remove unnecessary check.
10899 - Refactor circuit_predict_and_launch_new for readability and
10900 testability. Closes ticket 18873.
10901 - Refactor code to manipulate global_origin_circuit_list into
10902 separate functions. Closes ticket 20921.
10903 - Refactor large if statement in purpose_needs_anonymity to use
10904 switch statement instead. Closes part of ticket 20077.
10905 - Refactor the hashing API to return negative values for errors, as
10906 is done as throughout the codebase. Closes ticket 20717.
10907 - Remove data structures that were used to index or_connection
10908 objects by their RSA identity digests. These structures are fully
10909 redundant with the similar structures used in the
10910 channel abstraction.
10911 - Remove duplicate code in the channel_write_*cell() functions.
10912 Closes ticket 13827; patch from Pingl.
10913 - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
10914 use only purpose_needs_anonymity. Closes part of ticket 20077.
10915 - The code to generate and parse EXTEND and EXTEND2 cells has been
10916 replaced with code automatically generated by the
10919 o Documentation (formatting):
10920 - Clean up formatting of tor.1 man page and HTML doc, where <pre>
10921 blocks were incorrectly appearing. Closes ticket 20885.
10923 o Documentation (man page):
10924 - Clarify many options in tor.1 and add some min/max values for
10925 HiddenService options. Closes ticket 21058.
10928 - Change '1' to 'weight_scale' in consensus bw weights calculation
10929 comments, as that is reality. Closes ticket 20273. Patch
10931 - Clarify that when ClientRejectInternalAddresses is enabled (which
10932 is the default), multicast DNS hostnames for machines on the local
10933 network (of the form *.local) are also rejected. Closes
10935 - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
10936 250 KBytes to 2 MBytes. Fixes bug 20435; bugfix on 0.2.5.6-alpha.
10937 - Include the "TBits" unit in Tor's man page. Fixes part of bug
10938 20622; bugfix on 0.2.5.1-alpha.
10939 - Small fixes to the fuzzing documentation. Closes ticket 21472.
10940 - Stop the man page from incorrectly stating that HiddenServiceDir
10941 must already exist. Fixes 20486.
10942 - Update the description of the directory server options in the
10943 manual page, to clarify that a relay no longer needs to set
10944 DirPort in order to be a directory cache. Closes ticket 21720.
10946 o Removed features:
10947 - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
10948 limit for relays running on a single IP applies to authority IP
10949 addresses as well as to non-authority IP addresses. Closes
10951 - The UseDirectoryGuards torrc option no longer exists: all users
10952 that use entry guards will also use directory guards. Related to
10953 proposal 271; implements part of ticket 20831.
10956 - Add tests for networkstatus_compute_bw_weights_v10.
10957 - Add unit tests circuit_predict_and_launch_new.
10958 - Extract dummy_origin_circuit_new so it can be used by other
10960 - New unit tests for tor_htonll(). Closes ticket 19563. Patch
10961 from "overcaffeinated".
10962 - Perform the coding style checks when running the tests and fail
10963 when coding style violations are found. Closes ticket 5500.
10966 Changes in version 0.2.8.13 - 2017-03-03
10967 Tor 0.2.8.13 backports a security fix from later Tor
10968 releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
10969 this release, if for some reason they cannot upgrade to a later
10970 release series, and if they build Tor with the --enable-expensive-hardening
10973 Note that support for Tor 0.2.8.x is ending next year: we will not issue
10974 any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
10975 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
10977 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
10978 - Fix an integer underflow bug when comparing malformed Tor
10979 versions. This bug could crash Tor when built with
10980 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
10981 0.2.9.8, which were built with -ftrapv by default. In other cases
10982 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
10983 on 0.0.8pre1. Found by OSS-Fuzz.
10985 o Minor features (geoip):
10986 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
10990 Changes in version 0.2.7.7 - 2017-03-03
10991 Tor 0.2.7.7 backports a number of security fixes from later Tor
10992 releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
10993 this release, if for some reason they cannot upgrade to a later
10996 Note that support for Tor 0.2.7.x is ending this year: we will not issue
10997 any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
10998 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
11000 o Directory authority changes (backport from 0.2.8.5-rc):
11001 - Urras is no longer a directory authority. Closes ticket 19271.
11003 o Directory authority changes (backport from 0.2.9.2-alpha):
11004 - The "Tonga" bridge authority has been retired; the new bridge
11005 authority is "Bifroest". Closes tickets 19728 and 19690.
11007 o Directory authority key updates (backport from 0.2.8.1-alpha):
11008 - Update the V3 identity key for the dannenberg directory authority:
11009 it was changed on 18 November 2015. Closes task 17906. Patch
11012 o Major bugfixes (parsing, security, backport from 0.2.9.8):
11013 - Fix a bug in parsing that could cause clients to read a single
11014 byte past the end of an allocated region. This bug could be used
11015 to cause hardened clients (built with --enable-expensive-hardening)
11016 to crash if they tried to visit a hostile hidden service. Non-
11017 hardened clients are only affected depending on the details of
11018 their platform's memory allocator. Fixes bug 21018; bugfix on
11019 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
11020 2016-12-002 and as CVE-2016-1254.
11022 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
11023 - Stop a crash that could occur when a client running with DNSPort
11024 received a query with multiple address types, and the first
11025 address type was not supported. Found and fixed by Scott Dial.
11026 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
11027 - Prevent a class of security bugs caused by treating the contents
11028 of a buffer chunk as if they were a NUL-terminated string. At
11029 least one such bug seems to be present in all currently used
11030 versions of Tor, and would allow an attacker to remotely crash
11031 most Tor instances, especially those compiled with extra compiler
11032 hardening. With this defense in place, such bugs can't crash Tor,
11033 though we should still fix them as they occur. Closes ticket
11034 20384 (TROVE-2016-10-001).
11036 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
11037 - Avoid a difficult-to-trigger heap corruption attack when extending
11038 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
11039 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
11040 Reported by Guido Vranken.
11042 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
11043 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
11044 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
11046 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
11047 - If OpenSSL fails to generate an RSA key, do not retain a dangling
11048 pointer to the previous (uninitialized) key value. The impact here
11049 should be limited to a difficult-to-trigger crash, if OpenSSL is
11050 running an engine that makes key generation failures possible, or
11051 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
11052 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
11055 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
11056 - Fix an integer underflow bug when comparing malformed Tor
11057 versions. This bug could crash Tor when built with
11058 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
11059 0.2.9.8, which were built with -ftrapv by default. In other cases
11060 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
11061 on 0.0.8pre1. Found by OSS-Fuzz.
11063 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
11064 - Make memwipe() do nothing when passed a NULL pointer or buffer of
11065 zero size. Check size argument to memwipe() for underflow. Fixes
11066 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
11069 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
11070 - Make Tor survive errors involving connections without a
11071 corresponding event object. Previously we'd fail with an
11072 assertion; now we produce a log message. Related to bug 16248.
11074 o Minor features (geoip):
11075 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
11079 Changes in version 0.2.6.11 - 2017-03-03
11080 Tor 0.2.6.11 backports a number of security fixes from later Tor
11081 releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
11082 this release, if for some reason they cannot upgrade to a later
11085 Note that support for Tor 0.2.6.x is ending this year: we will not issue
11086 any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
11087 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
11089 o Directory authority changes (backport from 0.2.8.5-rc):
11090 - Urras is no longer a directory authority. Closes ticket 19271.
11092 o Directory authority changes (backport from 0.2.9.2-alpha):
11093 - The "Tonga" bridge authority has been retired; the new bridge
11094 authority is "Bifroest". Closes tickets 19728 and 19690.
11096 o Directory authority key updates (backport from 0.2.8.1-alpha):
11097 - Update the V3 identity key for the dannenberg directory authority:
11098 it was changed on 18 November 2015. Closes task 17906. Patch
11101 o Major features (security fixes, backport from 0.2.9.4-alpha):
11102 - Prevent a class of security bugs caused by treating the contents
11103 of a buffer chunk as if they were a NUL-terminated string. At
11104 least one such bug seems to be present in all currently used
11105 versions of Tor, and would allow an attacker to remotely crash
11106 most Tor instances, especially those compiled with extra compiler
11107 hardening. With this defense in place, such bugs can't crash Tor,
11108 though we should still fix them as they occur. Closes ticket
11109 20384 (TROVE-2016-10-001).
11111 o Major bugfixes (parsing, security, backport from 0.2.9.8):
11112 - Fix a bug in parsing that could cause clients to read a single
11113 byte past the end of an allocated region. This bug could be used
11114 to cause hardened clients (built with --enable-expensive-hardening)
11115 to crash if they tried to visit a hostile hidden service. Non-
11116 hardened clients are only affected depending on the details of
11117 their platform's memory allocator. Fixes bug 21018; bugfix on
11118 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
11119 2016-12-002 and as CVE-2016-1254.
11121 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
11122 - Stop a crash that could occur when a client running with DNSPort
11123 received a query with multiple address types, and the first
11124 address type was not supported. Found and fixed by Scott Dial.
11125 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
11127 o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
11128 - Fix an error that could cause us to read 4 bytes before the
11129 beginning of an openssl string. This bug could be used to cause
11130 Tor to crash on systems with unusual malloc implementations, or
11131 systems with unusual hardening installed. Fixes bug 17404; bugfix
11134 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
11135 - Avoid a difficult-to-trigger heap corruption attack when extending
11136 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
11137 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
11138 Reported by Guido Vranken.
11140 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
11141 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
11142 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
11144 o Major bugfixes (guard selection, backport from 0.2.7.6):
11145 - Actually look at the Guard flag when selecting a new directory
11146 guard. When we implemented the directory guard design, we
11147 accidentally started treating all relays as if they have the Guard
11148 flag during guard selection, leading to weaker anonymity and worse
11149 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
11152 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
11153 - If OpenSSL fails to generate an RSA key, do not retain a dangling
11154 pointer to the previous (uninitialized) key value. The impact here
11155 should be limited to a difficult-to-trigger crash, if OpenSSL is
11156 running an engine that makes key generation failures possible, or
11157 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
11158 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
11161 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
11162 - Fix an integer underflow bug when comparing malformed Tor
11163 versions. This bug could crash Tor when built with
11164 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
11165 0.2.9.8, which were built with -ftrapv by default. In other cases
11166 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
11167 on 0.0.8pre1. Found by OSS-Fuzz.
11169 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
11170 - Make memwipe() do nothing when passed a NULL pointer or buffer of
11171 zero size. Check size argument to memwipe() for underflow. Fixes
11172 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
11175 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
11176 - Make Tor survive errors involving connections without a
11177 corresponding event object. Previously we'd fail with an
11178 assertion; now we produce a log message. Related to bug 16248.
11180 o Minor features (geoip):
11181 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
11184 o Minor bugfixes (compilation, backport from 0.2.7.6):
11185 - Fix a compilation warning with Clang 3.6: Do not check the
11186 presence of an address which can never be NULL. Fixes bug 17781.
11189 Changes in version 0.2.5.13 - 2017-03-03
11190 Tor 0.2.5.13 backports a number of security fixes from later Tor
11191 releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
11192 this release, if for some reason they cannot upgrade to a later
11195 Note that support for Tor 0.2.5.x is ending next year: we will not issue
11196 any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
11197 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
11199 o Directory authority changes (backport from 0.2.8.5-rc):
11200 - Urras is no longer a directory authority. Closes ticket 19271.
11202 o Directory authority changes (backport from 0.2.9.2-alpha):
11203 - The "Tonga" bridge authority has been retired; the new bridge
11204 authority is "Bifroest". Closes tickets 19728 and 19690.
11206 o Directory authority key updates (backport from 0.2.8.1-alpha):
11207 - Update the V3 identity key for the dannenberg directory authority:
11208 it was changed on 18 November 2015. Closes task 17906. Patch
11211 o Major features (security fixes, backport from 0.2.9.4-alpha):
11212 - Prevent a class of security bugs caused by treating the contents
11213 of a buffer chunk as if they were a NUL-terminated string. At
11214 least one such bug seems to be present in all currently used
11215 versions of Tor, and would allow an attacker to remotely crash
11216 most Tor instances, especially those compiled with extra compiler
11217 hardening. With this defense in place, such bugs can't crash Tor,
11218 though we should still fix them as they occur. Closes ticket
11219 20384 (TROVE-2016-10-001).
11221 o Major bugfixes (parsing, security, backport from 0.2.9.8):
11222 - Fix a bug in parsing that could cause clients to read a single
11223 byte past the end of an allocated region. This bug could be used
11224 to cause hardened clients (built with --enable-expensive-hardening)
11225 to crash if they tried to visit a hostile hidden service. Non-
11226 hardened clients are only affected depending on the details of
11227 their platform's memory allocator. Fixes bug 21018; bugfix on
11228 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
11229 2016-12-002 and as CVE-2016-1254.
11231 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
11232 - Stop a crash that could occur when a client running with DNSPort
11233 received a query with multiple address types, and the first
11234 address type was not supported. Found and fixed by Scott Dial.
11235 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
11237 o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
11238 - Fix an error that could cause us to read 4 bytes before the
11239 beginning of an openssl string. This bug could be used to cause
11240 Tor to crash on systems with unusual malloc implementations, or
11241 systems with unusual hardening installed. Fixes bug 17404; bugfix
11244 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
11245 - Avoid a difficult-to-trigger heap corruption attack when extending
11246 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
11247 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
11248 Reported by Guido Vranken.
11250 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
11251 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
11252 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
11254 o Major bugfixes (guard selection, backport from 0.2.7.6):
11255 - Actually look at the Guard flag when selecting a new directory
11256 guard. When we implemented the directory guard design, we
11257 accidentally started treating all relays as if they have the Guard
11258 flag during guard selection, leading to weaker anonymity and worse
11259 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
11262 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
11263 - If OpenSSL fails to generate an RSA key, do not retain a dangling
11264 pointer to the previous (uninitialized) key value. The impact here
11265 should be limited to a difficult-to-trigger crash, if OpenSSL is
11266 running an engine that makes key generation failures possible, or
11267 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
11268 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
11271 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
11272 - Fix an integer underflow bug when comparing malformed Tor
11273 versions. This bug could crash Tor when built with
11274 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
11275 0.2.9.8, which were built with -ftrapv by default. In other cases
11276 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
11277 on 0.0.8pre1. Found by OSS-Fuzz.
11279 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
11280 - Make memwipe() do nothing when passed a NULL pointer or buffer of
11281 zero size. Check size argument to memwipe() for underflow. Fixes
11282 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
11285 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
11286 - Make Tor survive errors involving connections without a
11287 corresponding event object. Previously we'd fail with an
11288 assertion; now we produce a log message. Related to bug 16248.
11290 o Minor features (geoip):
11291 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
11294 o Minor bugfixes (compilation, backport from 0.2.7.6):
11295 - Fix a compilation warning with Clang 3.6: Do not check the
11296 presence of an address which can never be NULL. Fixes bug 17781.
11298 o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
11299 - Check for failures from crypto_early_init, and refuse to continue.
11300 A previous typo meant that we could keep going with an
11301 uninitialized crypto library, and would have OpenSSL initialize
11302 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
11303 when implementing ticket 4900. Patch by "teor".
11305 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
11306 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
11307 a client authorized hidden service. Fixes bug 15823; bugfix
11311 Changes in version 0.2.4.28 - 2017-03-03
11312 Tor 0.2.4.28 backports a number of security fixes from later Tor
11313 releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
11314 this release, if for some reason they cannot upgrade to a later
11317 Note that support for Tor 0.2.4.x is ending soon: we will not issue
11318 any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
11319 a Tor release series with long-term support, we recommend Tor 0.2.9.x.
11321 o Directory authority changes (backport from 0.2.8.5-rc):
11322 - Urras is no longer a directory authority. Closes ticket 19271.
11324 o Directory authority changes (backport from 0.2.9.2-alpha):
11325 - The "Tonga" bridge authority has been retired; the new bridge
11326 authority is "Bifroest". Closes tickets 19728 and 19690.
11328 o Directory authority key updates (backport from 0.2.8.1-alpha):
11329 - Update the V3 identity key for the dannenberg directory authority:
11330 it was changed on 18 November 2015. Closes task 17906. Patch
11333 o Major features (security fixes, backport from 0.2.9.4-alpha):
11334 - Prevent a class of security bugs caused by treating the contents
11335 of a buffer chunk as if they were a NUL-terminated string. At
11336 least one such bug seems to be present in all currently used
11337 versions of Tor, and would allow an attacker to remotely crash
11338 most Tor instances, especially those compiled with extra compiler
11339 hardening. With this defense in place, such bugs can't crash Tor,
11340 though we should still fix them as they occur. Closes ticket
11341 20384 (TROVE-2016-10-001).
11343 o Major bugfixes (parsing, security, backport from 0.2.9.8):
11344 - Fix a bug in parsing that could cause clients to read a single
11345 byte past the end of an allocated region. This bug could be used
11346 to cause hardened clients (built with --enable-expensive-hardening)
11347 to crash if they tried to visit a hostile hidden service. Non-
11348 hardened clients are only affected depending on the details of
11349 their platform's memory allocator. Fixes bug 21018; bugfix on
11350 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
11351 2016-12-002 and as CVE-2016-1254.
11353 o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
11354 - Fix an error that could cause us to read 4 bytes before the
11355 beginning of an openssl string. This bug could be used to cause
11356 Tor to crash on systems with unusual malloc implementations, or
11357 systems with unusual hardening installed. Fixes bug 17404; bugfix
11360 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
11361 - Avoid a difficult-to-trigger heap corruption attack when extending
11362 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
11363 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
11364 Reported by Guido Vranken.
11366 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
11367 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
11368 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
11370 o Major bugfixes (guard selection, backport from 0.2.7.6):
11371 - Actually look at the Guard flag when selecting a new directory
11372 guard. When we implemented the directory guard design, we
11373 accidentally started treating all relays as if they have the Guard
11374 flag during guard selection, leading to weaker anonymity and worse
11375 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
11378 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
11379 - If OpenSSL fails to generate an RSA key, do not retain a dangling
11380 pointer to the previous (uninitialized) key value. The impact here
11381 should be limited to a difficult-to-trigger crash, if OpenSSL is
11382 running an engine that makes key generation failures possible, or
11383 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
11384 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
11387 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
11388 - Fix an integer underflow bug when comparing malformed Tor
11389 versions. This bug could crash Tor when built with
11390 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
11391 0.2.9.8, which were built with -ftrapv by default. In other cases
11392 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
11393 on 0.0.8pre1. Found by OSS-Fuzz.
11395 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
11396 - Make memwipe() do nothing when passed a NULL pointer or buffer of
11397 zero size. Check size argument to memwipe() for underflow. Fixes
11398 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
11401 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
11402 - Make Tor survive errors involving connections without a
11403 corresponding event object. Previously we'd fail with an
11404 assertion; now we produce a log message. Related to bug 16248.
11406 o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
11407 - Make it harder for attackers to overload hidden services with
11408 introductions, by blocking multiple introduction requests on the
11409 same circuit. Resolves ticket 15515.
11411 o Minor features (geoip):
11412 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
11415 o Minor bugfixes (compilation, backport from 0.2.7.6):
11416 - Fix a compilation warning with Clang 3.6: Do not check the
11417 presence of an address which can never be NULL. Fixes bug 17781.
11419 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
11420 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
11421 a client authorized hidden service. Fixes bug 15823; bugfix
11425 Changes in version 0.2.9.10 - 2017-03-01
11426 Tor 0.2.9.10 backports a security fix from later Tor release. It also
11427 includes fixes for some major issues affecting directory authorities,
11428 LibreSSL compatibility, and IPv6 correctness.
11430 The Tor 0.2.9.x release series is now marked as a long-term-support
11431 series. We intend to backport security fixes to 0.2.9.x until at
11432 least January of 2020.
11434 o Major bugfixes (directory authority, 0.3.0.3-alpha):
11435 - During voting, when marking a relay as a probable sybil, do not
11436 clear its BadExit flag: sybils can still be bad in other ways
11437 too. (We still clear the other flags.) Fixes bug 21108; bugfix
11440 o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
11441 - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
11442 any IPv6 addresses. Instead, only reject a port over IPv6 if the
11443 exit policy rejects that port on more than an IPv6 /16 of
11444 addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
11445 which rejected a relay's own IPv6 address by default. Fixes bug
11446 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
11448 o Major bugfixes (parsing, also in 0.3.0.4-rc):
11449 - Fix an integer underflow bug when comparing malformed Tor
11450 versions. This bug could crash Tor when built with
11451 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
11452 0.2.9.8, which were built with -ftrapv by default. In other cases
11453 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
11454 on 0.0.8pre1. Found by OSS-Fuzz.
11456 o Minor features (directory authorities, also in 0.3.0.4-rc):
11457 - Directory authorities now reject descriptors that claim to be
11458 malformed versions of Tor. Helps prevent exploitation of
11460 - Reject version numbers with components that exceed INT32_MAX.
11461 Otherwise 32-bit and 64-bit platforms would behave inconsistently.
11462 Fixes bug 21450; bugfix on 0.0.8pre1.
11464 o Minor features (geoip):
11465 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
11468 o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
11469 - Autoconf now checks to determine if OpenSSL structures are opaque,
11470 instead of explicitly checking for OpenSSL version numbers. Part
11472 - Support building with recent LibreSSL code that uses opaque
11473 structures. Closes ticket 21359.
11475 o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
11476 - Repair a couple of (unreachable or harmless) cases of the risky
11477 comparison-by-subtraction pattern that caused bug 21278.
11479 o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
11480 - The tor-resolve command line tool now rejects hostnames over 255
11481 characters in length. Previously, it would silently truncate them,
11482 which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
11483 Patch by "junglefowl".
11486 Changes in version 0.2.9.9 - 2017-01-23
11487 Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
11488 cause relays and clients to crash, even if they were not built with
11489 the --enable-expensive-hardening option. This bug affects all 0.2.9.x
11490 versions, and also affects 0.3.0.1-alpha: all relays running an affected
11491 version should upgrade.
11493 This release also resolves a client-side onion service reachability
11494 bug, and resolves a pair of small portability issues.
11496 o Major bugfixes (security):
11497 - Downgrade the "-ftrapv" option from "always on" to "only on when
11498 --enable-expensive-hardening is provided." This hardening option,
11499 like others, can turn survivable bugs into crashes -- and having
11500 it on by default made a (relatively harmless) integer overflow bug
11501 into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
11502 bugfix on 0.2.9.1-alpha.
11504 o Major bugfixes (client, onion service):
11505 - Fix a client-side onion service reachability bug, where multiple
11506 socks requests to an onion service (or a single slow request)
11507 could cause us to mistakenly mark some of the service's
11508 introduction points as failed, and we cache that failure so
11509 eventually we run out and can't reach the service. Also resolves a
11510 mysterious "Remote server sent bogus reason code 65021" log
11511 warning. The bug was introduced in ticket 17218, where we tried to
11512 remember the circuit end reason as a uint16_t, which mangled
11513 negative values. Partially fixes bug 21056 and fixes bug 20307;
11514 bugfix on 0.2.8.1-alpha.
11516 o Minor features (geoip):
11517 - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
11520 o Minor bugfixes (portability):
11521 - Avoid crashing when Tor is built using headers that contain
11522 CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
11523 without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
11525 - Fix Libevent detection on platforms without Libevent 1 headers
11526 installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
11529 Changes in version 0.2.8.12 - 2016-12-19
11530 Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
11531 below) where Tor clients could crash when attempting to visit a
11532 hostile hidden service. Clients are recommended to upgrade as packages
11533 become available for their systems.
11535 It also includes an updated list of fallback directories, backported
11538 Now that the Tor 0.2.9 series is stable, only major bugfixes will be
11539 backported to 0.2.8 in the future.
11541 o Major bugfixes (parsing, security, backported from 0.2.9.8):
11542 - Fix a bug in parsing that could cause clients to read a single
11543 byte past the end of an allocated region. This bug could be used
11544 to cause hardened clients (built with --enable-expensive-hardening)
11545 to crash if they tried to visit a hostile hidden service. Non-
11546 hardened clients are only affected depending on the details of
11547 their platform's memory allocator. Fixes bug 21018; bugfix on
11548 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
11549 2016-12-002 and as CVE-2016-1254.
11551 o Minor features (fallback directory list, backported from 0.2.9.8):
11552 - Replace the 81 remaining fallbacks of the 100 originally
11553 introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
11554 fallbacks (123 new, 54 existing, 27 removed) generated in December
11555 2016. Resolves ticket 20170.
11557 o Minor features (geoip, backported from 0.2.9.7-rc):
11558 - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
11562 Changes in version 0.2.9.8 - 2016-12-19
11563 Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
11565 The Tor 0.2.9 series makes mandatory a number of security features
11566 that were formerly optional. It includes support for a new shared-
11567 randomness protocol that will form the basis for next generation
11568 hidden services, includes a single-hop hidden service mode for
11569 optimizing .onion services that don't actually want to be hidden,
11570 tries harder not to overload the directory authorities with excessive
11571 downloads, and supports a better protocol versioning scheme for
11572 improved compatibility with other implementations of the Tor protocol.
11574 And of course, there are numerous other bugfixes and improvements.
11576 This release also includes a fix for a medium-severity issue (bug
11577 21018 below) where Tor clients could crash when attempting to visit a
11578 hostile hidden service. Clients are recommended to upgrade as packages
11579 become available for their systems.
11581 Below are listed the changes since Tor 0.2.8.11. For a list of
11582 changes since 0.2.9.7-rc, see the ChangeLog file.
11584 o New system requirements:
11585 - When building with OpenSSL, Tor now requires version 1.0.1 or
11586 later. OpenSSL 1.0.0 and earlier are no longer supported by the
11587 OpenSSL team, and should not be used. Closes ticket 20303.
11588 - Tor now requires Libevent version 2.0.10-stable or later. Older
11589 versions of Libevent have less efficient backends for several
11590 platforms, and lack the DNS code that we use for our server-side
11591 DNS support. This implements ticket 19554.
11592 - Tor now requires zlib version 1.2 or later, for security,
11593 efficiency, and (eventually) gzip support. (Back when we started,
11594 zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
11595 released in 2003. We recommend the latest version.)
11597 o Deprecated features:
11598 - A number of DNS-cache-related sub-options for client ports are now
11599 deprecated for security reasons, and may be removed in a future
11600 version of Tor. (We believe that client-side DNS caching is a bad
11601 idea for anonymity, and you should not turn it on.) The options
11602 are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
11603 UseIPv4Cache, and UseIPv6Cache.
11604 - A number of options are deprecated for security reasons, and may
11605 be removed in a future version of Tor. The options are:
11606 AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
11607 AllowSingleHopExits, ClientDNSRejectInternalAddresses,
11608 CloseHSClientCircuitsImmediatelyOnTimeout,
11609 CloseHSServiceRendCircuitsImmediatelyOnTimeout,
11610 ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
11611 UseNTorHandshake, and WarnUnsafeSocks.
11612 - The *ListenAddress options are now deprecated as unnecessary: the
11613 corresponding *Port options should be used instead. These options
11614 may someday be removed. The affected options are:
11615 ControlListenAddress, DNSListenAddress, DirListenAddress,
11616 NATDListenAddress, ORListenAddress, SocksListenAddress,
11617 and TransListenAddress.
11619 o Major bugfixes (parsing, security, new since 0.2.9.7-rc):
11620 - Fix a bug in parsing that could cause clients to read a single
11621 byte past the end of an allocated region. This bug could be used
11622 to cause hardened clients (built with --enable-expensive-hardening)
11623 to crash if they tried to visit a hostile hidden service. Non-
11624 hardened clients are only affected depending on the details of
11625 their platform's memory allocator. Fixes bug 21018; bugfix on
11626 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
11627 2016-12-002 and as CVE-2016-1254.
11629 o Major features (build, hardening):
11630 - Tor now builds with -ftrapv by default on compilers that support
11631 it. This option detects signed integer overflow (which C forbids),
11632 and turns it into a hard-failure. We do not apply this option to
11633 code that needs to run in constant time to avoid side-channels;
11634 instead, we use -fwrapv in that code. Closes ticket 17983.
11635 - When --enable-expensive-hardening is selected, stop applying the
11636 clang/gcc sanitizers to code that needs to run in constant time.
11637 Although we are aware of no introduced side-channels, we are not
11638 able to prove that there are none. Related to ticket 17983.
11640 o Major features (circuit building, security):
11641 - Authorities, relays, and clients now require ntor keys in all
11642 descriptors, for all hops (except for rare hidden service protocol
11643 cases), for all circuits, and for all other roles. Part of
11645 - Authorities, relays, and clients only use ntor, except for
11646 rare cases in the hidden service protocol. Part of ticket 19163.
11648 o Major features (compilation):
11649 - Our big list of extra GCC warnings is now enabled by default when
11650 building with GCC (or with anything like Clang that claims to be
11651 GCC-compatible). To make all warnings into fatal compilation
11652 errors, pass --enable-fatal-warnings to configure. Closes
11654 - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
11655 turn on C and POSIX extensions. (Previously, we attempted to do
11656 this on an ad hoc basis.) Closes ticket 19139.
11658 o Major features (directory authorities, hidden services):
11659 - Directory authorities can now perform the shared randomness
11660 protocol specified by proposal 250. Using this protocol, directory
11661 authorities generate a global fresh random value every day. In the
11662 future, this value will be used by hidden services to select
11663 HSDirs. This release implements the directory authority feature;
11664 the hidden service side will be implemented in the future as part
11665 of proposal 224. Resolves ticket 16943; implements proposal 250.
11667 o Major features (downloading, random exponential backoff):
11668 - When we fail to download an object from a directory service, wait
11669 for an (exponentially increasing) randomized amount of time before
11670 retrying, rather than a fixed interval as we did before. This
11671 prevents a group of Tor instances from becoming too synchronized,
11672 or a single Tor instance from becoming too predictable, in its
11673 download schedule. Closes ticket 15942.
11675 o Major features (resource management):
11676 - Tor can now notice it is about to run out of sockets, and
11677 preemptively close connections of lower priority. (This feature is
11678 off by default for now, since the current prioritizing method is
11679 yet not mature enough. You can enable it by setting
11680 "DisableOOSCheck 0", but watch out: it might close some sockets
11681 you would rather have it keep.) Closes ticket 18640.
11683 o Major features (single-hop "hidden" services):
11684 - Add experimental HiddenServiceSingleHopMode and
11685 HiddenServiceNonAnonymousMode options. When both are set to 1,
11686 every hidden service on that Tor instance becomes a non-anonymous
11687 Single Onion Service. Single Onions make one-hop (direct)
11688 connections to their introduction and rendezvous points. One-hop
11689 circuits make Single Onion servers easily locatable, but clients
11690 remain location-anonymous. This is compatible with the existing
11691 hidden service implementation, and works on the current Tor
11692 network without any changes to older relays or clients. Implements
11693 proposal 260, completes ticket 17178. Patch by teor and asn.
11695 o Major features (subprotocol versions):
11696 - Tor directory authorities now vote on a set of recommended
11697 "subprotocol versions", and on a set of required subprotocol
11698 versions. Clients and relays that lack support for a _required_
11699 subprotocol version will not start; those that lack support for a
11700 _recommended_ subprotocol version will warn the user to upgrade.
11701 This change allows compatible implementations of the Tor protocol(s)
11702 to exist without pretending to be 100% bug-compatible with
11703 particular releases of Tor itself. Closes ticket 19958; implements
11704 part of proposal 264.
11706 o Major bugfixes (circuit building):
11707 - Hidden service client-to-intro-point and service-to-rendezvous-
11708 point circuits use the TAP key supplied by the protocol, to avoid
11709 epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
11711 o Major bugfixes (download scheduling):
11712 - Avoid resetting download status for consensuses hourly, since we
11713 already have another, smarter retry mechanism. Fixes bug 8625;
11714 bugfix on 0.2.0.9-alpha.
11715 - If a consensus expires while we are waiting for certificates to
11716 download, stop waiting for certificates.
11717 - If we stop waiting for certificates less than a minute after we
11718 started downloading them, do not consider the certificate download
11719 failure a separate failure. Fixes bug 20533; bugfix
11721 - When using exponential backoff in test networks, use a lower
11722 exponent, so the delays do not vary as much. This helps test
11723 networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
11725 o Major bugfixes (exit policies):
11726 - Avoid disclosing exit outbound bind addresses, configured port
11727 bind addresses, and local interface addresses in relay descriptors
11728 by default under ExitPolicyRejectPrivate. Instead, only reject
11729 these (otherwise unlisted) addresses if
11730 ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
11731 0.2.7.2-alpha. Patch by teor.
11733 o Major bugfixes (hidden services):
11734 - Allow Tor clients with appropriate controllers to work with
11735 FetchHidServDescriptors set to 0. Previously, this option also
11736 disabled descriptor cache lookup, thus breaking hidden services
11737 entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
11738 - Clients now require hidden services to include the TAP keys for
11739 their intro points in the hidden service descriptor. This prevents
11740 an inadvertent upgrade to ntor, which a malicious hidden service
11741 could use to distinguish clients by consensus version. Fixes bug
11742 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
11744 o Major bugfixes (relay, resolver, logging):
11745 - For relays that don't know their own address, avoid attempting a
11746 local hostname resolve for each descriptor we download. This
11747 will cut down on the number of "Success: chose address 'x.x.x.x'"
11748 log lines, and also avoid confusing clock jumps if the resolver
11749 is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
11751 o Minor features (port flags):
11752 - Add new flags to the *Port options to give finer control over which
11753 requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
11754 and the synthetic flag OnionTrafficOnly, which is equivalent to
11755 NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
11756 18693; patch by "teor".
11758 o Minor features (build, hardening):
11759 - Detect and work around a libclang_rt problem that would prevent
11760 clang from finding __mulodi4() on some 32-bit platforms, and thus
11761 keep -ftrapv from linking on those systems. Closes ticket 19079.
11762 - When building on a system without runtime support for the runtime
11763 hardening options, try to log a useful warning at configuration
11764 time, rather than an incomprehensible warning at link time. If
11765 expensive hardening was requested, this warning becomes an error.
11766 Closes ticket 18895.
11768 o Minor features (client, directory):
11769 - Since authorities now omit all routers that lack the Running and
11770 Valid flags, we assume that any relay listed in the consensus must
11771 have those flags. Closes ticket 20001; implements part of
11774 o Minor features (code safety):
11775 - In our integer-parsing functions, ensure that the maximum value we
11776 allow is no smaller than the minimum value. Closes ticket 19063;
11777 patch from "U+039b".
11779 o Minor features (compilation, portability):
11780 - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
11783 o Minor features (config):
11784 - Warn users when descriptor and port addresses are inconsistent.
11785 Mitigates bug 13953; patch by teor.
11787 o Minor features (controller):
11788 - Allow controllers to configure basic client authorization on
11789 hidden services when they create them with the ADD_ONION controller
11790 command. Implements ticket 15588. Patch by "special".
11791 - Fire a STATUS_SERVER controller event whenever the hibernation
11792 status changes between "awake"/"soft"/"hard". Closes ticket 18685.
11793 - Implement new GETINFO queries for all downloads that use
11794 download_status_t to schedule retries. This allows controllers to
11795 examine the schedule for pending downloads. Closes ticket 19323.
11797 o Minor features (development tools, etags):
11798 - Teach the "make tags" Makefile target how to correctly find
11799 "MOCK_IMPL" function definitions. Patch from nherring; closes
11802 o Minor features (directory authority):
11803 - After voting, if the authorities decide that a relay is not
11804 "Valid", they no longer include it in the consensus at all. Closes
11805 ticket 20002; implements part of proposal 272.
11806 - Directory authorities now only give the Guard flag to a relay if
11807 they are also giving it the Stable flag. This change allows us to
11808 simplify path selection for clients. It should have minimal effect
11809 in practice, since >99% of Guards already have the Stable flag.
11810 Implements ticket 18624.
11811 - Directory authorities now write their v3-status-votes file out to
11812 disk earlier in the consensus process, so we have a record of the
11813 votes even if we abort the consensus process. Resolves
11816 o Minor features (fallback directory list, new since 0.2.9.7-rc):
11817 - Replace the 81 remaining fallbacks of the 100 originally
11818 introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
11819 fallbacks (123 new, 54 existing, 27 removed) generated in December
11820 2016. Resolves ticket 20170.
11822 o Minor features (hidden service):
11823 - Stop being so strict about the payload length of "rendezvous1"
11824 cells. We used to be locked in to the "TAP" handshake length, and
11825 now we can handle better handshakes like "ntor". Resolves
11828 o Minor features (infrastructure, time):
11829 - Tor now includes an improved timer backend, so that we can
11830 efficiently support tens or hundreds of thousands of concurrent
11831 timers, as will be needed for some of our planned anti-traffic-
11832 analysis work. This code is based on William Ahern's "timeout.c"
11833 project, which implements a "tickless hierarchical timing wheel".
11834 Closes ticket 18365.
11835 - Tor now uses the operating system's monotonic timers (where
11836 available) for internal fine-grained timing. Previously we would
11837 look at the system clock, and then attempt to compensate for the
11838 clock running backwards. Closes ticket 18908.
11840 o Minor features (logging):
11841 - Add a set of macros to check nonfatal assertions, for internal
11842 use. Migrating more of our checks to these should help us avoid
11843 needless crash bugs. Closes ticket 18613.
11844 - Provide a more useful warning message when configured with an
11845 invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
11846 - When dumping unparseable router descriptors, optionally store them
11847 in separate files, named by digest, up to a configurable size
11848 limit. You can change the size limit by setting the
11849 MaxUnparseableDescSizeToLog option, and disable this feature by
11850 setting that option to 0. Closes ticket 18322.
11852 o Minor features (performance):
11853 - Change the "optimistic data" extension from "off by default" to
11854 "on by default". The default was ordinarily overridden by a
11855 consensus option, but when clients were bootstrapping for the
11856 first time, they would not have a consensus to get the option
11857 from. Changing this default saves a round-trip during startup.
11858 Closes ticket 18815.
11860 o Minor features (relay, usability):
11861 - When the directory authorities refuse a bad relay's descriptor,
11862 encourage the relay operator to contact us. Many relay operators
11863 won't notice this line in their logs, but it's a win if even a few
11864 learn why we don't like what their relay was doing. Resolves
11867 o Minor features (security, TLS):
11868 - Servers no longer support clients that lack AES ciphersuites.
11869 (3DES is no longer considered an acceptable cipher.) We believe
11870 that no such Tor clients currently exist, since Tor has required
11871 OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
11873 o Minor features (testing):
11874 - Disable memory protections on OpenBSD when performing our unit
11875 tests for memwipe(). The test deliberately invokes undefined
11876 behavior, and the OpenBSD protections interfere with this. Patch
11877 from "rubiate". Closes ticket 20066.
11878 - Move the test-network.sh script to chutney, and modify tor's test-
11879 network.sh to call the (newer) chutney version when available.
11880 Resolves ticket 19116. Patch by teor.
11881 - Use the lcov convention for marking lines as unreachable, so that
11882 we don't count them when we're generating test coverage data.
11883 Update our coverage tools to understand this convention. Closes
11885 - Our link-handshake unit tests now check that when invalid
11886 handshakes fail, they fail with the error messages we expected.
11887 - Our unit testing code that captures log messages no longer
11888 prevents them from being written out if the user asked for them
11889 (by passing --debug or --info or --notice or --warn to the "test"
11890 binary). This change prevents us from missing unexpected log
11891 messages simply because we were looking for others. Related to
11893 - The unit tests now log all warning messages with the "BUG" flag.
11894 Previously, they only logged errors by default. This change will
11895 help us make our testing code more correct, and make sure that we
11896 only hit this code when we mean to. In the meantime, however,
11897 there will be more warnings in the unit test logs than before.
11898 This is preparatory work for ticket 19999.
11899 - The unit tests now treat any failure of a "tor_assert_nonfatal()"
11900 assertion as a test failure.
11901 - We've done significant work to make the unit tests run faster.
11903 o Minor features (testing, ipv6):
11904 - Add the hs-ipv6 chutney target to make test-network-all's IPv6
11905 tests. Remove bridges+hs, as it's somewhat redundant. This
11906 requires a recent chutney version that supports IPv6 clients,
11907 relays, and authorities. Closes ticket 20069; patch by teor.
11908 - Add the single-onion and single-onion-ipv6 chutney targets to
11909 "make test-network-all". This requires a recent chutney version
11910 with the single onion network flavors (git c72a652 or later).
11911 Closes ticket 20072; patch by teor.
11913 o Minor features (Tor2web):
11914 - Make Tor2web clients respect ReachableAddresses. This feature was
11915 inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
11916 0.2.8.7. Implements feature 20034. Patch by teor.
11918 o Minor features (unix domain sockets):
11919 - When configuring a unix domain socket for a SocksPort,
11920 ControlPort, or Hidden service, you can now wrap the address in
11921 quotes, using C-style escapes inside the quotes. This allows unix
11922 domain socket paths to contain spaces. Resolves ticket 18753.
11924 o Minor features (user interface):
11925 - Tor now supports the ability to declare options deprecated, so
11926 that we can recommend that people stop using them. Previously, this
11927 was done in an ad-hoc way. There is a new --list-deprecated-options
11928 command-line option to list all of the deprecated options. Closes
11931 o Minor features (virtual addresses):
11932 - Increase the maximum number of bits for the IPv6 virtual network
11933 prefix from 16 to 104. In this way, the condition for address
11934 allocation is less restrictive. Closes ticket 20151; feature
11937 o Minor bug fixes (circuits):
11938 - Use the CircuitBuildTimeout option whenever
11939 LearnCircuitBuildTimeout is disabled. Previously, we would respect
11940 the option when a user disabled it, but not when it was disabled
11941 because some other option was set. Fixes bug 20073; bugfix on
11942 0.2.4.12-alpha. Patch by teor.
11944 o Minor bugfixes (build):
11945 - The current Git revision when building from a local repository is
11946 now detected correctly when using git worktrees. Fixes bug 20492;
11947 bugfix on 0.2.3.9-alpha.
11949 o Minor bugfixes (relay address discovery):
11950 - Stop reordering IP addresses returned by the OS. This makes it
11951 more likely that Tor will guess the same relay IP address every
11952 time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
11953 Reported by René Mayrhofer, patch by "cypherpunks".
11955 o Minor bugfixes (memory allocation):
11956 - Change how we allocate memory for large chunks on buffers, to
11957 avoid a (currently impossible) integer overflow, and to waste less
11958 space when allocating unusually large chunks. Fixes bug 20081;
11959 bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
11961 o Minor bugfixes (bootstrap):
11962 - Remember the directory server we fetched the consensus or previous
11963 certificates from, and use it to fetch future authority
11964 certificates. This change improves bootstrapping performance.
11965 Fixes bug 18963; bugfix on 0.2.8.1-alpha.
11967 o Minor bugfixes (circuits):
11968 - Make sure extend_info_from_router() is only called on servers.
11969 Fixes bug 19639; bugfix on 0.2.8.1-alpha.
11971 o Minor bugfixes (client, fascistfirewall):
11972 - Avoid spurious warnings when ReachableAddresses or FascistFirewall
11973 is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
11975 o Minor bugfixes (client, unix domain sockets):
11976 - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
11977 the client address is meaningless. Fixes bug 20261; bugfix
11980 o Minor bugfixes (code style):
11981 - Fix an integer signedness conversion issue in the case conversion
11982 tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
11984 o Minor bugfixes (compilation):
11985 - Build correctly on versions of libevent2 without support for
11986 evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
11988 - When building with Clang, use a full set of GCC warnings.
11989 (Previously, we included only a subset, because of the way we
11990 detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
11991 - Detect Libevent2 functions correctly on systems that provide
11992 libevent2, but where libevent1 is linked with -levent. Fixes bug
11993 19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
11994 - Run correctly when built on Windows build environments that
11995 require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
11997 o Minor bugfixes (configuration):
11998 - When parsing quoted configuration values from the torrc file,
11999 handle Windows line endings correctly. Fixes bug 19167; bugfix on
12000 0.2.0.16-alpha. Patch from "Pingl".
12002 o Minor bugfixes (directory authority):
12003 - Authorities now sort the "package" lines in their votes, for ease
12004 of debugging. (They are already sorted in consensus documents.)
12005 Fixes bug 18840; bugfix on 0.2.6.3-alpha.
12006 - Die with a more useful error when the operator forgets to place
12007 the authority_signing_key file into the keys directory. This
12008 avoids an uninformative assert & traceback about having an invalid
12009 key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
12010 - When allowing private addresses, mark Exits that only exit to
12011 private locations as such. Fixes bug 20064; bugfix
12013 - When parsing a detached signature, make sure we use the length of
12014 the digest algorithm instead of a hardcoded DIGEST256_LEN in
12015 order to avoid comparing bytes out-of-bounds with a smaller digest
12016 length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
12018 o Minor bugfixes (getpass):
12019 - Defensively fix a non-triggerable heap corruption at do_getpass()
12020 to protect ourselves from mistakes in the future. Fixes bug
12021 19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
12024 o Minor bugfixes (guard selection):
12025 - Don't mark guards as unreachable if connection_connect() fails.
12026 That function fails for local reasons, so it shouldn't reveal
12027 anything about the status of the guard. Fixes bug 14334; bugfix
12029 - Use a single entry guard even if the NumEntryGuards consensus
12030 parameter is not provided. Fixes bug 17688; bugfix
12033 o Minor bugfixes (hidden services):
12034 - Increase the minimum number of internal circuits we preemptively
12035 build from 2 to 3, so a circuit is available when a client
12036 connects to another onion service. Fixes bug 13239; bugfix
12038 - Allow hidden services to run on IPv6 addresses even when the
12039 IPv6Exit option is not set. Fixes bug 18357; bugfix
12041 - Stop logging intro point details to the client log on certain
12042 error conditions. Fixed as part of bug 20012; bugfix on
12043 0.2.4.8-alpha. Patch by teor.
12044 - When deleting an ephemeral hidden service, close its intro points
12045 even if they are not completely open. Fixes bug 18604; bugfix
12047 - When configuring hidden services, check every hidden service
12048 directory's permissions. Previously, we only checked the last
12049 hidden service. Fixes bug 20529; bugfix on 0.2.6.2-alpha.
12051 o Minor bugfixes (IPv6, testing):
12052 - Check for IPv6 correctly on Linux when running test networks.
12053 Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
12055 o Minor bugfixes (Linux seccomp2 sandbox):
12056 - Add permission to run the sched_yield() and sigaltstack() system
12057 calls, in order to support versions of Tor compiled with asan or
12058 ubsan code that use these calls. Now "sandbox 1" and
12059 "--enable-expensive-hardening" should be compatible on more
12060 systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
12062 o Minor bugfixes (logging):
12063 - Downgrade a harmless log message about the
12064 pending_entry_connections list from "warn" to "info". Mitigates
12066 - Log a more accurate message when we fail to dump a microdescriptor.
12067 Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
12068 - When logging a directory ownership mismatch, log the owning
12069 username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
12070 - When we are unable to remove the bw_accounting file, do not warn
12071 if the reason we couldn't remove it was that it didn't exist.
12072 Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from pastly.
12074 o Minor bugfixes (memory leak):
12075 - Fix a series of slow memory leaks related to parsing torrc files
12076 and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
12077 - Avoid a small memory leak when informing worker threads about
12078 rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
12079 - Fix a small memory leak when receiving AF_UNIX connections on a
12080 SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
12081 - When moving a signed descriptor object from a source to an
12082 existing destination, free the allocated memory inside that
12083 destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
12084 - Fix a memory leak and use-after-free error when removing entries
12085 from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
12086 0.2.5.5-alpha. Patch from "cypherpunks".
12087 - Fix a small, uncommon memory leak that could occur when reading a
12088 truncated ed25519 key file. Fixes bug 18956; bugfix
12091 o Minor bugfixes (option parsing):
12092 - Count unix sockets when counting client listeners (SOCKS, Trans,
12093 NATD, and DNS). This has no user-visible behavior changes: these
12094 options are set once, and never read. Required for correct
12095 behavior in ticket 17178. Fixes bug 19677; bugfix on
12096 0.2.6.3-alpha. Patch by teor.
12098 o Minor bugfixes (options):
12099 - Check the consistency of UseEntryGuards and EntryNodes more
12100 reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
12102 - Stop changing the configured value of UseEntryGuards on
12103 authorities and Tor2web clients. Fixes bug 20074; bugfix on
12104 commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
12107 o Minor bugfixes (relay):
12108 - Ensure relays don't make multiple connections during bootstrap.
12109 Fixes bug 20591; bugfix on 0.2.8.1-alpha.
12110 - Do not try to parallelize workers more than 16x without the user
12111 explicitly configuring us to do so, even if we do detect more than
12112 16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
12114 o Minor bugfixes (testing):
12115 - The test-stem and test-network makefile targets now depend only on
12116 the tor binary that they are testing. Previously, they depended on
12117 "make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
12118 patch from "cypherpunks".
12119 - Allow clients to retry HSDirs much faster in test networks. Fixes
12120 bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
12121 - Avoid a unit test failure on systems with over 16 detectable CPU
12122 cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
12123 - Let backtrace tests work correctly under AddressSanitizer:
12124 disable ASAN's detection of segmentation faults while running
12125 test_bt.sh, so that we can make sure that our own backtrace
12126 generation code works. Fixes bug 18934; bugfix
12127 on 0.2.5.2-alpha. Patch from "cypherpunks".
12128 - Fix the test-network-all target on out-of-tree builds by using the
12129 correct path to the test driver script. Fixes bug 19421; bugfix
12131 - Stop spurious failures in the local interface address discovery
12132 unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
12134 - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
12135 removed the ECDH ciphers which caused the tests to fail on
12136 platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
12137 - The tor_tls_server_info_callback unit test no longer crashes when
12138 debug-level logging is turned on. Fixes bug 20041; bugfix
12141 o Minor bugfixes (time):
12142 - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
12143 bugfix on all released tor versions.
12144 - When computing the difference between two times in milliseconds,
12145 we now round to the nearest millisecond correctly. Previously, we
12146 could sometimes round in the wrong direction. Fixes bug 19428;
12147 bugfix on 0.2.2.2-alpha.
12149 o Minor bugfixes (Tor2web):
12150 - Prevent Tor2web clients from running hidden services: these services
12151 are not anonymous due to the one-hop client paths. Fixes bug
12152 19678. Patch by teor.
12154 o Minor bugfixes (user interface):
12155 - Display a more accurate number of suppressed messages in the log
12156 rate-limiter. Previously, there was a potential integer overflow
12157 in the counter. Now, if the number of messages hits a maximum, the
12158 rate-limiter doesn't count any further. Fixes bug 19435; bugfix
12160 - Fix a typo in the passphrase prompt for the ed25519 identity key.
12161 Fixes bug 19503; bugfix on 0.2.7.2-alpha.
12163 o Code simplification and refactoring:
12164 - Remove redundant declarations of the MIN macro. Closes
12166 - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
12167 Closes ticket 18462; patch from "icanhasaccount".
12168 - Split the 600-line directory_handle_command_get function into
12169 separate functions for different URL types. Closes ticket 16698.
12172 - Add module-level internal documentation for 36 C files that
12173 previously didn't have a high-level overview. Closes ticket 20385.
12174 - Correct the IPv6 syntax in our documentation for the
12175 VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
12176 - Correct the minimum bandwidth value in torrc.sample, and queue a
12177 corresponding change for torrc.minimal. Closes ticket 20085.
12178 - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
12179 ticket 19153. Patch from "U+039b".
12180 - Module-level documentation for several more modules. Closes
12181 tickets 19287 and 19290.
12182 - Document the --passphrase-fd option in the tor manpage. Fixes bug
12183 19504; bugfix on 0.2.7.3-rc.
12184 - Document the default PathsNeededToBuildCircuits value that's used
12185 by clients when the directory authorities don't set
12186 min_paths_for_circs_pct. Fixes bug 20117; bugfix on 0.2.4.10-alpha.
12187 Patch by teor, reported by Jesse V.
12188 - Fix manual for the User option: it takes a username, not a UID.
12189 Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
12191 - Fix the description of the --passphrase-fd option in the
12192 tor-gencert manpage. The option is used to pass the number of a
12193 file descriptor to read the passphrase from, not to read the file
12194 descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
12197 - We no longer include the (dead, deprecated) bufferevent code in
12198 Tor. Closes ticket 19450. Based on a patch from "U+039b".
12200 o Removed features:
12201 - Remove support for "GET /tor/bytes.txt" DirPort request, and
12202 "GETINFO dir-usage" controller request, which were only available
12203 via a compile-time option in Tor anyway. Feature was added in
12204 0.2.2.1-alpha. Resolves ticket 19035.
12205 - There is no longer a compile-time option to disable support for
12206 TransPort. (If you don't want TransPort, just don't use it.) Patch
12207 from "U+039b". Closes ticket 19449.
12210 - Run more workqueue tests as part of "make check". These had
12211 previously been implemented, but you needed to know special
12212 command-line options to enable them.
12213 - We now have unit tests for our code to reject zlib "compression
12214 bombs". (Fortunately, the code works fine.)
12217 Changes in version 0.2.8.11 - 2016-12-08
12218 Tor 0.2.8.11 backports fixes for additional portability issues that
12219 could prevent Tor from building correctly on OSX Sierra, or with
12220 OpenSSL 1.1. Affected users should upgrade; others can safely stay
12223 o Minor bugfixes (portability):
12224 - Avoid compilation errors when building on OSX Sierra. Sierra began
12225 to support the getentropy() and clock_gettime() APIs, but created
12226 a few problems in doing so. Tor 0.2.9 has a more thorough set of
12227 workarounds; in 0.2.8, we are just using the /dev/urandom and mach
12228 monotonic time interfaces. Fixes bug 20865. Bugfix
12231 o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
12232 - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
12233 architectures. Closes ticket 20588.
12236 Changes in version 0.2.8.10 - 2016-12-02
12237 Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
12238 unusable after they left standby mode. It also backports fixes for
12239 a few portability issues and a small but problematic memory leak.
12241 o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
12242 - When Tor leaves standby because of a new application request, open
12243 circuits as needed to serve that request. Previously, we would
12244 potentially wait a very long time. Fixes part of bug 19969; bugfix
12247 o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
12248 - Clients now respond to new application stream requests immediately
12249 when they arrive, rather than waiting up to one second before
12250 starting to handle them. Fixes part of bug 19969; bugfix
12253 o Minor bugfixes (portability, backport from 0.2.9.6-rc):
12254 - Work around a bug in the OSX 10.12 SDK that would prevent us from
12255 successfully targeting earlier versions of OSX. Resolves
12258 o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
12259 - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
12260 20551; bugfix on 0.2.1.1-alpha.
12262 o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
12263 - Work around a memory leak in OpenSSL 1.1 when encoding public
12264 keys. Fixes bug 20553; bugfix on 0.0.2pre8.
12266 o Minor features (geoip):
12267 - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
12271 Changes in version 0.2.8.9 - 2016-10-17
12272 Tor 0.2.8.9 backports a fix for a security hole in previous versions
12273 of Tor that would allow a remote attacker to crash a Tor client,
12274 hidden service, relay, or authority. All Tor users should upgrade to
12275 this version, or to 0.2.9.4-alpha. Patches will be released for older
12278 o Major features (security fixes, also in 0.2.9.4-alpha):
12279 - Prevent a class of security bugs caused by treating the contents
12280 of a buffer chunk as if they were a NUL-terminated string. At
12281 least one such bug seems to be present in all currently used
12282 versions of Tor, and would allow an attacker to remotely crash
12283 most Tor instances, especially those compiled with extra compiler
12284 hardening. With this defense in place, such bugs can't crash Tor,
12285 though we should still fix them as they occur. Closes ticket
12286 20384 (TROVE-2016-10-001).
12288 o Minor features (geoip):
12289 - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
12293 Changes in version 0.2.8.8 - 2016-09-23
12294 Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
12295 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
12296 who select public relays as their bridges.
12298 o Major bugfixes (crash):
12299 - Fix a complicated crash bug that could affect Tor clients
12300 configured to use bridges when replacing a networkstatus consensus
12301 in which one of their bridges was mentioned. OpenBSD users saw
12302 more crashes here, but all platforms were potentially affected.
12303 Fixes bug 20103; bugfix on 0.2.8.2-alpha.
12305 o Major bugfixes (relay, OOM handler):
12306 - Fix a timing-dependent assertion failure that could occur when we
12307 tried to flush from a circuit after having freed its cells because
12308 of an out-of-memory condition. Fixes bug 20203; bugfix on
12309 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
12312 o Minor feature (fallback directories):
12313 - Remove broken fallbacks from the hard-coded fallback directory
12314 list. Closes ticket 20190; patch by teor.
12316 o Minor features (geoip):
12317 - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
12321 Changes in version 0.2.8.7 - 2016-08-24
12322 Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
12323 option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
12324 who sets the ReachableAddresses option, and all bridges, are strongly
12325 encouraged to upgrade.
12327 o Directory authority changes:
12328 - The "Tonga" bridge authority has been retired; the new bridge
12329 authority is "Bifroest". Closes tickets 19728 and 19690.
12331 o Major bugfixes (client, security):
12332 - Only use the ReachableAddresses option to restrict the first hop
12333 in a path. In earlier versions of 0.2.8.x, it would apply to
12334 every hop in the path, with a possible degradation in anonymity
12335 for anyone using an uncommon ReachableAddress setting. Fixes bug
12336 19973; bugfix on 0.2.8.2-alpha.
12338 o Minor features (geoip):
12339 - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
12342 o Minor bugfixes (compilation):
12343 - Remove an inappropriate "inline" in tortls.c that was causing
12344 warnings on older versions of GCC. Fixes bug 19903; bugfix
12347 o Minor bugfixes (fallback directories):
12348 - Avoid logging a NULL string pointer when loading fallback
12349 directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
12350 and 0.2.8.1-alpha. Report and patch by "rubiate".
12353 Changes in version 0.2.8.6 - 2016-08-02
12355 Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
12357 The Tor 0.2.8 series improves client bootstrapping performance,
12358 completes the authority-side implementation of improved identity
12359 keys for relays, and includes numerous bugfixes and performance
12360 improvements throughout the program. This release continues to
12361 improve the coverage of Tor's test suite. For a full list of
12362 changes since Tor 0.2.7, see the ReleaseNotes file.
12364 Below is a list of the changes since Tor 0.2.7.
12366 o New system requirements:
12367 - Tor no longer attempts to support platforms where the "time_t"
12368 type is unsigned. (To the best of our knowledge, only OpenVMS does
12369 this, and Tor has never actually built on OpenVMS.) Closes
12371 - Tor no longer supports versions of OpenSSL with a broken
12372 implementation of counter mode. (This bug was present in OpenSSL
12373 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
12374 longer runs with, these versions.
12375 - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
12376 later (released in 2008 and 2009 respectively). If you are
12377 building Tor from the git repository instead of from the source
12378 distribution, and your tools are older than this, you will need to
12379 upgrade. Closes ticket 17732.
12381 o Directory authority changes:
12382 - Update the V3 identity key for the dannenberg directory authority:
12383 it was changed on 18 November 2015. Closes task 17906. Patch
12385 - Urras is no longer a directory authority. Closes ticket 19271.
12387 o Major features (directory system):
12388 - Include a trial list of default fallback directories, based on an
12389 opt-in survey of suitable relays. Doing this should make clients
12390 bootstrap more quickly and reliably, and reduce the load on the
12391 directory authorities. Closes ticket 15775. Patch by teor.
12392 Candidates identified using an OnionOO script by weasel, teor,
12393 gsathya, and karsten.
12394 - Previously only relays that explicitly opened a directory port
12395 (DirPort) accepted directory requests from clients. Now all
12396 relays, with and without a DirPort, accept and serve tunneled
12397 directory requests that they receive through their ORPort. You can
12398 disable this behavior using the new DirCache option. Closes
12400 - When bootstrapping multiple consensus downloads at a time, use the
12401 first one that starts downloading, and close the rest. This
12402 reduces failures when authorities or fallback directories are slow
12403 or down. Together with the code for feature 15775, this feature
12404 should reduces failures due to fallback churn. Implements ticket
12405 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
12406 mikeperry and teor.
12408 o Major features (security, Linux):
12409 - When Tor starts as root on Linux and is told to switch user ID, it
12410 can now retain the capability to bind to low ports. By default,
12411 Tor will do this only when it's switching user ID and some low
12412 ports have been configured. You can change this behavior with the
12413 new option KeepBindCapabilities. Closes ticket 8195.
12415 o Major bugfixes (client, bootstrapping):
12416 - Check if bootstrap consensus downloads are still needed when the
12417 linked connection attaches. This prevents tor making unnecessary
12418 begindir-style connections, which are the only directory
12419 connections tor clients make since the fix for 18483 was merged.
12420 - Fix some edge cases where consensus download connections may not
12421 have been closed, even though they were not needed. Related to fix
12423 - Make relays retry consensus downloads the correct number of times,
12424 rather than the more aggressive client retry count. Fixes part of
12427 o Major bugfixes (dns proxy mode, crash):
12428 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
12429 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
12431 o Major bugfixes (ed25519, voting):
12432 - Actually enable support for authorities to match routers by their
12433 Ed25519 identities. Previously, the code had been written, but
12434 some debugging code that had accidentally been left in the
12435 codebase made it stay turned off. Fixes bug 17702; bugfix
12437 - When collating votes by Ed25519 identities, authorities now
12438 include a "NoEdConsensus" flag if the ed25519 value (or lack
12439 thereof) for a server does not reflect the majority consensus.
12440 Related to bug 17668; bugfix on 0.2.7.2-alpha.
12441 - When generating a vote with keypinning disabled, never include two
12442 entries for the same ed25519 identity. This bug was causing
12443 authorities to generate votes that they could not parse when a
12444 router violated key pinning by changing its RSA identity but
12445 keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
12446 18318. Bugfix on 0.2.7.2-alpha.
12448 o Major bugfixes (key management):
12449 - If OpenSSL fails to generate an RSA key, do not retain a dangling
12450 pointer to the previous (uninitialized) key value. The impact here
12451 should be limited to a difficult-to-trigger crash, if OpenSSL is
12452 running an engine that makes key generation failures possible, or
12453 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
12454 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
12457 o Major bugfixes (security, client, DNS proxy):
12458 - Stop a crash that could occur when a client running with DNSPort
12459 received a query with multiple address types, and the first
12460 address type was not supported. Found and fixed by Scott Dial.
12461 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
12463 o Major bugfixes (security, compilation):
12464 - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
12465 is predefined. Previously, our use of -D_FORTIFY_SOURCE would
12466 cause a compiler warning, thereby making other checks fail, and
12467 needlessly disabling compiler-hardening support. Fixes one case of
12468 bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
12469 - Repair hardened builds under the clang compiler. Previously, our
12470 use of _FORTIFY_SOURCE would conflict with clang's address
12471 sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
12473 o Major bugfixes (security, pointers):
12474 - Avoid a difficult-to-trigger heap corruption attack when extending
12475 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
12476 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
12477 Reported by Guido Vranken.
12479 o Major bugfixes (testing):
12480 - Fix a bug that would block 'make test-network-all' on systems where
12481 IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
12483 o Major bugfixes (user interface):
12484 - Correctly give a warning in the cases where a relay is specified
12485 by nickname, and one such relay is found, but it is not officially
12486 Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
12488 o Minor features (accounting):
12489 - Added two modes to the AccountingRule option: One for limiting
12490 only the number of bytes sent ("AccountingRule out"), and one for
12491 limiting only the number of bytes received ("AccountingRule in").
12492 Closes ticket 15989; patch from "unixninja92".
12494 o Minor features (bug-resistance):
12495 - Make Tor survive errors involving connections without a
12496 corresponding event object. Previously we'd fail with an
12497 assertion; now we produce a log message. Related to bug 16248.
12498 - Use tor_snprintf() and tor_vsnprintf() even in external and low-
12499 level code, to harden against accidental failures to NUL-
12500 terminate. Part of ticket 17852. Patch from jsturgix. Found
12503 o Minor features (build):
12504 - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
12505 as having possible IPFW support. Closes ticket 18448. Patch from
12506 Steven Chamberlain.
12507 - Since our build process now uses "make distcheck", we no longer
12508 force "make dist" to depend on "make check". Closes ticket 17893;
12509 patch from "cypherpunks".
12510 - Tor now builds once again with the recent OpenSSL 1.1 development
12511 branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
12512 tracking OpenSSL 1.1 development as it has progressed, and fixing
12513 numerous compatibility issues as they arose. See tickets
12514 17549, 17921, 17984, 19499, and 18286.
12515 - When building manual pages, set the timezone to "UTC", so that the
12516 output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
12517 Patch from intrigeri.
12519 o Minor features (clients):
12520 - Make clients, onion services, and bridge relays always use an
12521 encrypted begindir connection for directory requests. Resolves
12522 ticket 18483. Patch by teor.
12524 o Minor features (controller):
12525 - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
12526 controllers can examine the the reject rules added by
12527 ExitPolicyRejectPrivate. This makes it easier for stem to display
12529 - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
12530 tickets 16774 and 17817. Patch by George Tankersley.
12531 - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
12532 service descriptor from a service's local hidden service
12533 descriptor cache. Closes ticket 14846.
12535 o Minor features (crypto):
12536 - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
12537 - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
12539 - Improve performance when hashing non-multiple of 8 sized buffers,
12540 based on Andrew Moon's public domain SipHash-2-4 implementation.
12541 Fixes bug 17544; bugfix on 0.2.5.3-alpha.
12542 - Validate the hard-coded Diffie-Hellman parameters and ensure that
12543 p is a safe prime, and g is a suitable generator. Closes
12545 - When allocating a digest state object, allocate no more space than
12546 we actually need. Previously, we would allocate as much space as
12547 the state for the largest algorithm would need. This change saves
12548 up to 672 bytes per circuit. Closes ticket 17796.
12550 o Minor features (directory downloads):
12551 - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
12552 directory mirrors. The default is 1; set it to 0 to disable
12553 fallbacks. Implements ticket 17576. Patch by teor.
12554 - Wait for busy authorities and fallback directories to become non-
12555 busy when bootstrapping. (A similar change was made in 6c443e987d
12556 for directory caches chosen from the consensus.) Closes ticket
12557 17864; patch by teor.
12559 o Minor features (geoip):
12560 - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
12563 o Minor features (hidden service directory):
12564 - Streamline relay-side hsdir handling: when relays consider whether
12565 to accept an uploaded hidden service descriptor, they no longer
12566 check whether they are one of the relays in the network that is
12567 "supposed" to handle that descriptor. Implements ticket 18332.
12569 o Minor features (IPv6):
12570 - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
12571 to 1, tor prefers IPv6 directory addresses.
12572 - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
12573 avoids using IPv4 for client OR and directory connections.
12574 - Add address policy assume_action support for IPv6 addresses.
12575 - Add an argument 'ipv6=address:orport' to the DirAuthority and
12576 FallbackDir torrc options, to specify an IPv6 address for an
12577 authority or fallback directory. Add hard-coded ipv6 addresses for
12578 directory authorities that have them. Closes ticket 17327; patch
12579 from Nick Mathewson and teor.
12580 - Allow users to configure directory authorities and fallback
12581 directory servers with IPv6 addresses and ORPorts. Resolves
12583 - Limit IPv6 mask bits to 128.
12584 - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
12585 17638; bugfix on 0.0.2pre8. Patch by teor.
12586 - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
12587 "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
12588 "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
12589 - Warn when comparing against an AF_UNSPEC address in a policy, it's
12590 almost always a bug. Closes ticket 17863; patch by teor.
12591 - routerset_parse now accepts IPv6 literal addresses. Fixes bug
12592 17060; bugfix on 0.2.1.3-alpha. Patch by teor.
12594 o Minor features (Linux seccomp2 sandbox):
12595 - Reject attempts to change our Address with "Sandbox 1" enabled.
12596 Changing Address with Sandbox turned on would never actually work,
12597 but previously it would fail in strange and confusing ways. Found
12598 while fixing 18548.
12600 o Minor features (logging):
12601 - When logging to syslog, allow a tag to be added to the syslog
12602 identity (the string prepended to every log message). The tag can
12603 be configured with SyslogIdentityTag and defaults to none. Setting
12604 it to "foo" will cause logs to be tagged as "Tor-foo". Closes
12607 o Minor features (portability):
12608 - Use timingsafe_memcmp() where available. Closes ticket 17944;
12609 patch from <logan@hackers.mu>.
12611 o Minor features (relay, address discovery):
12612 - Add a family argument to get_interface_addresses_raw() and
12613 subfunctions to make network interface address interogation more
12614 efficient. Now Tor can specifically ask for IPv4, IPv6 or both
12615 types of interfaces from the operating system. Resolves
12617 - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
12618 fails to enumerate interface addresses using the platform-specific
12619 API, have it rely on the UDP socket fallback technique to try and
12620 find out what IP addresses (both IPv4 and IPv6) our machine has.
12621 Resolves ticket 17951.
12623 o Minor features (replay cache):
12624 - The replay cache now uses SHA256 instead of SHA1. Implements
12625 feature 8961. Patch by teor, issue reported by rransom.
12627 o Minor features (robustness):
12628 - Exit immediately with an error message if the code attempts to use
12629 Libevent without having initialized it. This should resolve some
12630 frequently-made mistakes in our unit tests. Closes ticket 18241.
12632 o Minor features (security, clock):
12633 - Warn when the system clock appears to move back in time (when the
12634 state file was last written in the future). Tor doesn't know that
12635 consensuses have expired if the clock is in the past. Patch by
12636 teor. Implements ticket 17188.
12638 o Minor features (security, exit policies):
12639 - ExitPolicyRejectPrivate now rejects more private addresses by
12640 default. Specifically, it now rejects the relay's outbound bind
12641 addresses (if configured), and the relay's configured port
12642 addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
12643 0.2.0.11-alpha. Patch by teor.
12645 o Minor features (security, memory erasure):
12646 - Make memwipe() do nothing when passed a NULL pointer or buffer of
12647 zero size. Check size argument to memwipe() for underflow. Fixes
12648 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
12650 - Set the unused entries in a smartlist to NULL. This helped catch
12651 a (harmless) bug, and shouldn't affect performance too much.
12652 Implements ticket 17026.
12653 - Use SecureMemoryWipe() function to securely clean memory on
12654 Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
12655 Implements feature 17986.
12656 - Use explicit_bzero or memset_s when present. Previously, we'd use
12657 OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
12658 from <logan@hackers.mu> and <selven@hackers.mu>.
12660 o Minor features (security, RNG):
12661 - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
12662 positively are not allowed to fail. Previously we depended on
12663 internal details of OpenSSL's behavior. Closes ticket 17686.
12664 - Never use the system entropy output directly for anything besides
12665 seeding the PRNG. When we want to generate important keys, instead
12666 of using system entropy directly, we now hash it with the PRNG
12667 stream. This may help resist certain attacks based on broken OS
12668 entropy implementations. Closes part of ticket 17694.
12669 - Use modern system calls (like getentropy() or getrandom()) to
12670 generate strong entropy on platforms that have them. Closes
12673 o Minor features (security, win32):
12674 - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
12675 attack. Fixes bug 18123; bugfix on all tor versions. Patch
12678 o Minor features (unix domain sockets):
12679 - Add a new per-socket option, RelaxDirModeCheck, to allow creating
12680 Unix domain sockets without checking the permissions on the parent
12681 directory. (Tor checks permissions by default because some
12682 operating systems only check permissions on the parent directory.
12683 However, some operating systems do look at permissions on the
12684 socket, and tor's default check is unneeded.) Closes ticket 18458.
12687 o Minor features (unix file permissions):
12688 - Defer creation of Unix sockets until after setuid. This avoids
12689 needing CAP_CHOWN and CAP_FOWNER when using systemd's
12690 CapabilityBoundingSet, or chown and fowner when using SELinux.
12691 Implements part of ticket 17562. Patch from Jamie Nguyen.
12692 - If any directory created by Tor is marked as group readable, the
12693 filesystem group is allowed to be either the default GID or the
12694 root user. Allowing root to read the DataDirectory prevents the
12695 need for CAP_READ_SEARCH when using systemd's
12696 CapabilityBoundingSet, or dac_read_search when using SELinux.
12697 Implements part of ticket 17562. Patch from Jamie Nguyen.
12698 - Introduce a new DataDirectoryGroupReadable option. If it is set to
12699 1, the DataDirectory will be made readable by the default GID.
12700 Implements part of ticket 17562. Patch from Jamie Nguyen.
12702 o Minor bugfixes (accounting):
12703 - The max bandwidth when using 'AccountRule sum' is now correctly
12704 logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
12705 from "unixninja92".
12707 o Minor bugfixes (assert, portability):
12708 - Fix an assertion failure in memarea.c on systems where "long" is
12709 shorter than the size of a pointer. Fixes bug 18716; bugfix
12712 o Minor bugfixes (bootstrap):
12713 - Consistently use the consensus download schedule for authority
12714 certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
12716 o Minor bugfixes (build):
12717 - Avoid spurious failures from configure files related to calling
12718 exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
12719 0.2.0.1-alpha. Patch from "cypherpunks".
12720 - Do not link the unit tests against both the testing and non-
12721 testing versions of the static libraries. Fixes bug 18490; bugfix
12723 - Resolve warnings when building on systems that are concerned with
12724 signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
12726 - Silence spurious clang-scan warnings in the ed25519_donna code by
12727 explicitly initializing some objects. Fixes bug 18384; bugfix on
12728 0.2.7.2-alpha. Patch by teor.
12729 - When libscrypt.h is found, but no libscrypt library can be linked,
12730 treat libscrypt as absent. Fixes bug 19161; bugfix
12732 - Cause the unit tests to compile correctly on mingw64 versions that
12733 lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
12734 - Don't try to use the pthread_condattr_setclock() function unless
12735 it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
12736 17819; bugfix on 0.2.6.3-alpha.
12737 - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
12739 - Fix search for libevent libraries on OpenBSD (and other systems
12740 that install libevent 1 and libevent 2 in parallel). Fixes bug
12741 16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
12742 - Isolate environment variables meant for tests from the rest of the
12743 build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
12744 - Mark all object files that include micro-revision.i as depending
12745 on it, so as to make parallel builds more reliable. Fixes bug
12746 17826; bugfix on 0.2.5.1-alpha.
12747 - Remove config.log only from make distclean, not from make clean.
12748 Fixes bug 17924; bugfix on 0.2.4.1-alpha.
12749 - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
12751 - Remove an #endif from configure.ac so that we correctly detect the
12752 presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
12755 o Minor bugfixes (client, bootstrap):
12756 - Count receipt of new microdescriptors as progress towards
12757 bootstrapping. Previously, with EntryNodes set, Tor might not
12758 successfully repopulate the guard set on bootstrapping. Fixes bug
12759 16825; bugfix on 0.2.3.1-alpha.
12761 o Minor bugfixes (code correctness):
12762 - Fix a bad memory handling bug that would occur if we had queued a
12763 cell on a channel's incoming queue. Fortunately, we can't actually
12764 queue a cell like that as our code is constructed today, but it's
12765 best to avoid this kind of error, even if there isn't any code
12766 that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
12767 - Assert that allocated memory held by the reputation code is freed
12768 according to its internal counters. Fixes bug 17753; bugfix
12770 - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
12772 - Update to the latest version of Trunnel, which tries harder to
12773 avoid generating code that can invoke memcpy(p,NULL,0). Bug found
12774 by clang address sanitizer. Fixes bug 18373; bugfix
12776 - When closing an entry connection, generate a warning if we should
12777 have sent an end cell for it but we haven't. Fixes bug 17876;
12778 bugfix on 0.2.3.2-alpha.
12780 o Minor bugfixes (configuration):
12781 - Fix a tiny memory leak when parsing a port configuration ending in
12782 ":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
12784 o Minor bugfixes (containers):
12785 - If we somehow attempt to construct a heap with more than
12786 1073741822 elements, avoid an integer overflow when maintaining
12787 the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
12789 o Minor bugfixes (controller, microdescriptors):
12790 - Make GETINFO dir/status-vote/current/consensus conform to the
12791 control specification by returning "551 Could not open cached
12792 consensus..." when not caching consensuses. Fixes bug 18920;
12793 bugfix on 0.2.2.6-alpha.
12795 o Minor bugfixes (crypto):
12796 - Check the return value of HMAC() and assert on failure. Fixes bug
12797 17658; bugfix on 0.2.3.6-alpha. Patch by teor.
12799 o Minor bugfixes (directories):
12800 - When fetching extrainfo documents, compare their SHA256 digests
12801 and Ed25519 signing key certificates with the routerinfo that led
12802 us to fetch them, rather than with the most recent routerinfo.
12803 Otherwise we generate many spurious warnings about mismatches.
12804 Fixes bug 17150; bugfix on 0.2.7.2-alpha.
12805 - When generating a URL for a directory server on an IPv6 address,
12806 wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
12807 on 0.2.3.9-alpha. Patch from Malek.
12809 o Minor bugfixes (downloading):
12810 - Predict more correctly whether we'll be downloading over HTTP when
12811 we determine the maximum length of a URL. This should avoid a
12812 "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
12815 o Minor bugfixes (exit policies, security):
12816 - Refresh an exit relay's exit policy when interface addresses
12817 change. Previously, tor only refreshed the exit policy when the
12818 configured external address changed. Fixes bug 18208; bugfix on
12819 0.2.7.3-rc. Patch by teor.
12821 o Minor bugfixes (fallback directories):
12822 - Mark fallbacks as "too busy" when they return a 503 response,
12823 rather than just marking authorities. Fixes bug 17572; bugfix on
12824 0.2.4.7-alpha. Patch by teor.
12825 - When requesting extrainfo descriptors from a trusted directory
12826 server, check whether it is an authority or a fallback directory
12827 which supports extrainfo descriptors. Fixes bug 18489; bugfix on
12828 0.2.4.7-alpha. Reported by atagar, patch by teor.
12830 o Minor bugfixes (hidden service, client):
12831 - Handle the case where the user makes several fast consecutive
12832 requests to the same .onion address. Previously, the first six
12833 requests would each trigger a descriptor fetch, each picking a
12834 directory (there are 6 overall) and the seventh one would fail
12835 because no directories were left, thereby triggering a close on
12836 all current directory connections asking for the hidden service.
12837 The solution here is to not close the connections if we have
12838 pending directory fetches. Fixes bug 15937; bugfix
12841 o Minor bugfixes (hidden service, control port):
12842 - Add the onion address to the HS_DESC event for the UPLOADED action
12843 both on success or failure. It was previously hardcoded with
12844 UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
12846 o Minor bugfixes (hidden service, directory):
12847 - Bridges now refuse "rendezvous2" (hidden service descriptor)
12848 publish attempts. Suggested by ticket 18332.
12850 o Minor bugfixes (IPv6):
12851 - Update the limits in max_dl_per_request for IPv6 address length.
12852 Fixes bug 17573; bugfix on 0.2.1.5-alpha.
12854 o Minor bugfixes (Linux seccomp2 sandbox):
12855 - Allow more syscalls when running with "Sandbox 1" enabled:
12856 sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
12857 some systems, these are required for Tor to start. Fixes bug
12858 18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
12859 - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
12860 so that get_interface_address6_via_udp_socket_hack() can work.
12861 Fixes bug 19660; bugfix on 0.2.5.1-alpha.
12862 - Allow the setrlimit syscall, and the prlimit and prlimit64
12863 syscalls, which some libc implementations use under the hood.
12864 Fixes bug 15221; bugfix on 0.2.5.1-alpha.
12865 - Avoid a 10-second delay when starting as a client with "Sandbox 1"
12866 enabled and no DNS resolvers configured. This should help TAILS
12867 start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
12868 - Fix a crash when using offline master ed25519 keys with the Linux
12869 seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
12870 - Allow statistics to be written to disk when "Sandbox 1" is
12871 enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
12872 0.2.6.1-alpha respectively.
12874 o Minor bugfixes (logging):
12875 - In log messages that include a function name, use __FUNCTION__
12876 instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
12877 with clang __PRETTY_FUNCTION__ has extra information we don't
12878 need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
12880 - Remove needless quotes from a log message about unparseable
12881 addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
12882 - Scrub service name in "unrecognized service ID" log messages.
12883 Fixes bug 18600; bugfix on 0.2.4.11-alpha.
12884 - When logging information about an unparsable networkstatus vote or
12885 consensus, do not say "vote" when we mean consensus. Fixes bug
12886 18368; bugfix on 0.2.0.8-alpha.
12887 - When we can't generate a signing key because OfflineMasterKey is
12888 set, do not imply that we should have been able to load it. Fixes
12889 bug 18133; bugfix on 0.2.7.2-alpha.
12890 - When logging a malformed hostname received through socks4, scrub
12891 it if SafeLogging says we should. Fixes bug 17419; bugfix
12894 o Minor bugfixes (memory safety):
12895 - Avoid freeing an uninitialized pointer when opening a socket fails
12896 in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
12897 0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
12899 - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
12900 18672; bugfix on 0.2.5.1-alpha.
12901 - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
12904 o Minor bugfixes (pluggable transports):
12905 - Avoid reporting a spurious error when we decide that we don't need
12906 to terminate a pluggable transport because it has already exited.
12907 Fixes bug 18686; bugfix on 0.2.5.5-alpha.
12909 o Minor bugfixes (pointer arithmetic):
12910 - Fix a bug in memarea_alloc() that could have resulted in remote
12911 heap write access, if Tor had ever passed an unchecked size to
12912 memarea_alloc(). Fortunately, all the sizes we pass to
12913 memarea_alloc() are pre-checked to be less than 128 kilobytes.
12914 Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
12917 o Minor bugfixes (private directory):
12918 - Prevent a race condition when creating private directories. Fixes
12919 part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
12920 Patch from jsturgix. Found with Flawfinder.
12922 o Minor bugfixes (relays):
12923 - Check that both the ORPort and DirPort (if present) are reachable
12924 before publishing a relay descriptor. Otherwise, relays publish a
12925 descriptor with DirPort 0 when the DirPort reachability test takes
12926 longer than the ORPort reachability test. Fixes bug 18050; bugfix
12927 on 0.1.0.1-rc. Reported by "starlight", patch by teor.
12928 - Resolve some edge cases where we might launch an ORPort
12929 reachability check even when DisableNetwork is set. Noticed while
12930 fixing bug 18616; bugfix on 0.2.3.9-alpha.
12932 o Minor bugfixes (relays, hidden services):
12933 - Refuse connection requests to private OR addresses unless
12934 ExtendAllowPrivateAddresses is set. Previously, tor would connect,
12935 then refuse to send any cells to a private address. Fixes bugs
12936 17674 and 8976; bugfix on 0.2.3.21-rc. Patch by teor.
12938 o Minor bugfixes (security, hidden services):
12939 - Prevent hidden services connecting to client-supplied rendezvous
12940 addresses that are reserved as internal or multicast. Fixes bug
12941 8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
12943 o Minor bugfixes (statistics):
12944 - Consistently check for overflow in round_*_to_next_multiple_of
12945 functions, and add unit tests with additional and maximal values.
12946 Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
12947 - Handle edge cases in the laplace functions: avoid division by
12948 zero, avoid taking the log of zero, and silence clang type
12949 conversion warnings using round and trunc. Add unit tests for edge
12950 cases with maximal values. Fixes part of bug 13192; bugfix
12952 - We now include consensus downloads via IPv6 in our directory-
12953 request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
12955 o Minor bugfixes (test networks, IPv6):
12956 - Allow internal IPv6 addresses in descriptors in test networks.
12957 Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
12960 o Minor bugfixes (testing):
12961 - Check the full results of SHA256 and SHA512 digests in the unit
12962 tests. Bugfix on 0.2.2.4-alpha. Patch by teor.
12963 - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
12965 - Fix a small memory leak that would occur when the
12966 TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
12967 bugfix on 0.2.5.2-alpha.
12968 - Make unit tests pass on IPv6-only systems, and systems without
12969 localhost addresses (like some FreeBSD jails). Fixes bug 17632;
12970 bugfix on 0.2.7.3-rc. Patch by teor.
12971 - The test for log_heartbeat was incorrectly failing in timezones
12972 with non-integer offsets. Instead of comparing the end of the time
12973 string against a constant, compare it to the output of
12974 format_local_iso_time when given the correct input. Fixes bug
12975 18039; bugfix on 0.2.5.4-alpha.
12976 - We no longer disable assertions in the unit tests when coverage is
12977 enabled. Instead, we require you to say --disable-asserts-in-tests
12978 to the configure script if you need assertions disabled in the
12979 unit tests (for example, if you want to perform branch coverage).
12980 Fixes bug 18242; bugfix on 0.2.7.1-alpha.
12982 o Minor bugfixes (time handling):
12983 - When correcting a corrupt 'struct tm' value, fill in the tm_wday
12984 field. Otherwise, our unit tests crash on Windows. Fixes bug
12985 18977; bugfix on 0.2.2.25-alpha.
12986 - Avoid overflow in tor_timegm when parsing dates in and after 2038
12987 on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
12988 0.0.2pre14. Patch by teor.
12990 o Minor bugfixes (tor-gencert):
12991 - Correctly handle the case where an authority operator enters a
12992 passphrase but sends an EOF before sending a newline. Fixes bug
12993 17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
12995 o Code simplification and refactoring:
12996 - Clean up a little duplicated code in
12997 crypto_expand_key_material_TAP(). Closes ticket 17587; patch
12999 - Decouple the list of streams waiting to be attached to circuits
13000 from the overall connection list. This change makes it possible to
13001 attach streams quickly while simplifying Tor's callgraph and
13002 avoiding O(N) scans of the entire connection list. Closes
13004 - Extract the more complicated parts of circuit_mark_for_close()
13005 into a new function that we run periodically before circuits are
13006 freed. This change removes more than half of the functions
13007 currently in the "blob". Closes ticket 17218.
13008 - Move logging of redundant policy entries in
13009 policies_parse_exit_policy_internal into its own function. Closes
13010 ticket 17608; patch from "juce".
13011 - Quote all the string interpolations in configure.ac -- even those
13012 which we are pretty sure can't contain spaces. Closes ticket
13013 17744. Patch from zerosion.
13014 - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
13015 use them. Closes ticket 17926.
13016 - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
13017 inplace, so there's no need to have a separate implementation for
13018 the non-inplace code. Closes ticket 18258. Patch from Malek.
13019 - Simplify return types for some crypto functions that can't
13020 actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
13021 - When a direct directory request fails immediately on launch,
13022 instead of relaunching that request from inside the code that
13023 launches it, instead mark the connection for teardown. This change
13024 simplifies Tor's callback and prevents the directory-request
13025 launching code from invoking itself recursively. Closes
13029 - Add a description of the correct use of the '--keygen' command-
13030 line option. Closes ticket 17583; based on text by 's7r'.
13031 - Change build messages to refer to "Fedora" instead of "Fedora
13032 Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
13033 Patches from "icanhasaccount" and "cypherpunks".
13034 - Document the contents of the 'datadir/keys' subdirectory in the
13035 manual page. Closes ticket 17621.
13036 - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
13037 - Explain actual minima for BandwidthRate. Closes ticket 16382.
13038 - Fix a minor formatting typo in the manpage. Closes ticket 17791.
13039 - Mention torspec URL in the manpage and point the reader to it
13040 whenever we mention a document that belongs in torspce. Fixes
13042 - Stop recommending use of nicknames to identify relays in our
13043 MapAddress documentation. Closes ticket 18312.
13045 o Removed features:
13046 - Remove client-side support for connecting to Tor relays running
13047 versions of Tor before 0.2.3.6-alpha. These relays didn't support
13048 the v3 TLS handshake protocol, and are no longer allowed on the
13049 Tor network. Implements the client side of ticket 11150. Based on
13050 patches by Tom van der Woerdt.
13051 - We no longer maintain an internal freelist in memarea.c.
13052 Allocators should be good enough to make this code unnecessary,
13053 and it's doubtful that it ever had any performance benefit.
13056 - Add unit tests to check for common RNG failure modes, such as
13057 returning all zeroes, identical values, or incrementing values
13058 (OpenSSL's rand_predictable feature). Patch by teor.
13059 - Always test both ed25519 backends, so that we can be sure that our
13060 batch-open replacement code works. Part of ticket 16794.
13061 - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
13062 portion of ticket 16831.
13063 - Fix several warnings from clang's address sanitizer produced in
13065 - Log more information when the backtrace tests fail. Closes ticket
13066 17892. Patch from "cypherpunks."
13067 - More unit tests for compat_libevent.c, procmon.c, tortls.c,
13068 util_format.c, directory.c, and options_validate.c. Closes tickets
13069 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
13071 - Treat backtrace test failures as expected on FreeBSD until we
13072 solve bug 17808. Closes ticket 18204.
13073 - Unit tests for directory_handle_command_get. Closes ticket 17004.
13074 Patch from Reinaldo de Souza Jr.
13077 Changes in version 0.2.7.6 - 2015-12-10
13078 Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
13079 well as a minor bug in hidden service reliability.
13081 o Major bugfixes (guard selection):
13082 - Actually look at the Guard flag when selecting a new directory
13083 guard. When we implemented the directory guard design, we
13084 accidentally started treating all relays as if they have the Guard
13085 flag during guard selection, leading to weaker anonymity and worse
13086 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
13089 o Minor features (geoip):
13090 - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
13093 o Minor bugfixes (compilation):
13094 - When checking for net/pfvar.h, include netinet/in.h if possible.
13095 This fixes transparent proxy detection on OpenBSD. Fixes bug
13096 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
13097 - Fix a compilation warning with Clang 3.6: Do not check the
13098 presence of an address which can never be NULL. Fixes bug 17781.
13100 o Minor bugfixes (correctness):
13101 - When displaying an IPv6 exit policy, include the mask bits
13102 correctly even when the number is greater than 31. Fixes bug
13103 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
13104 - The wrong list was used when looking up expired intro points in a
13105 rend service object, causing what we think could be reachability
13106 issues for hidden services, and triggering a BUG log. Fixes bug
13107 16702; bugfix on 0.2.7.2-alpha.
13108 - Fix undefined behavior in the tor_cert_checksig function. Fixes
13109 bug 17722; bugfix on 0.2.7.2-alpha.
13112 Changes in version 0.2.7.5 - 2015-11-20
13113 The Tor 0.2.7 release series is dedicated to the memory of Tor user
13114 and privacy advocate Caspar Bowden (1961-2015). Caspar worked
13115 tirelessly to advocate human rights regardless of national borders,
13116 and oppose the encroachments of mass surveillance. He opposed national
13117 exceptionalism, he brought clarity to legal and policy debates, he
13118 understood and predicted the impact of mass surveillance on the world,
13119 and he laid the groundwork for resisting it. While serving on the Tor
13120 Project's board of directors, he brought us his uncompromising focus
13121 on technical excellence in the service of humankind. Caspar was an
13122 inimitable force for good and a wonderful friend. He was kind,
13123 humorous, generous, gallant, and believed we should protect one
13124 another without exception. We honor him here for his ideals, his
13125 efforts, and his accomplishments. Please honor his memory with works
13126 that would make him proud.
13128 Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
13130 The 0.2.7 series adds a more secure identity key type for relays,
13131 improves cryptography performance, resolves several longstanding
13132 hidden-service performance issues, improves controller support for
13133 hidden services, and includes small bugfixes and performance
13134 improvements throughout the program. This release series also includes
13135 more tests than before, and significant simplifications to which parts
13136 of Tor invoke which others. For a full list of changes, see below.
13138 o New system requirements:
13139 - Tor no longer includes workarounds to support Libevent versions
13140 before 1.3e. Libevent 2.0 or later is recommended. Closes
13142 - Tor no longer supports copies of OpenSSL that are missing support
13143 for Elliptic Curve Cryptography. (We began using ECC when
13144 available in 0.2.4.8-alpha, for more safe and efficient key
13145 negotiation.) In particular, support for at least one of P256 or
13146 P224 is now required, with manual configuration needed if only
13147 P224 is available. Resolves ticket 16140.
13148 - Tor no longer supports versions of OpenSSL before 1.0. (If you are
13149 on an operating system that has not upgraded to OpenSSL 1.0 or
13150 later, and you compile Tor from source, you will need to install a
13151 more recent OpenSSL to link Tor against.) These versions of
13152 OpenSSL are still supported by the OpenSSL, but the numerous
13153 cryptographic improvements in later OpenSSL releases makes them a
13154 clear choice. Resolves ticket 16034.
13156 o Major features (controller):
13157 - Add the ADD_ONION and DEL_ONION commands that allow the creation
13158 and management of hidden services via the controller. Closes
13160 - New "GETINFO onions/current" and "GETINFO onions/detached"
13161 commands to get information about hidden services created via the
13162 controller. Part of ticket 6411.
13163 - New HSFETCH command to launch a request for a hidden service
13164 descriptor. Closes ticket 14847.
13165 - New HSPOST command to upload a hidden service descriptor. Closes
13166 ticket 3523. Patch by "DonnchaC".
13168 o Major features (Ed25519 identity keys, Proposal 220):
13169 - Add support for offline encrypted Ed25519 master keys. To use this
13170 feature on your tor relay, run "tor --keygen" to make a new master
13171 key (or to make a new signing key if you already have a master
13172 key). Closes ticket 13642.
13173 - All relays now maintain a stronger identity key, using the Ed25519
13174 elliptic curve signature format. This master key is designed so
13175 that it can be kept offline. Relays also generate an online
13176 signing key, and a set of other Ed25519 keys and certificates.
13177 These are all automatically regenerated and rotated as needed.
13178 Implements part of ticket 12498.
13179 - Directory authorities now vote on Ed25519 identity keys along with
13180 RSA1024 keys. Implements part of ticket 12498.
13181 - Directory authorities track which Ed25519 identity keys have been
13182 used with which RSA1024 identity keys, and do not allow them to
13183 vary freely. Implements part of ticket 12498.
13184 - Microdescriptors now include Ed25519 identity keys. Implements
13185 part of ticket 12498.
13186 - Add a --newpass option to allow changing or removing the
13187 passphrase of an encrypted key with tor --keygen. Implements part
13189 - Add a new OfflineMasterKey option to tell Tor never to try loading
13190 or generating a secret Ed25519 identity key. You can use this in
13191 combination with tor --keygen to manage offline and/or encrypted
13192 Ed25519 keys. Implements ticket 16944.
13193 - On receiving a HUP signal, check to see whether the Ed25519
13194 signing key has changed, and reload it if so. Closes ticket 16790.
13195 - Significant usability improvements for Ed25519 key management. Log
13196 messages are better, and the code can recover from far more
13197 failure conditions. Thanks to "s7r" for reporting and diagnosing
13200 o Major features (ECC performance):
13201 - Improve the runtime speed of Ed25519 signature verification by
13202 using Ed25519-donna's batch verification support. Implements
13204 - Improve the speed of Ed25519 operations and Curve25519 keypair
13205 generation when built targeting 32 bit x86 platforms with SSE2
13206 available. Implements ticket 16535.
13207 - Improve the runtime speed of Ed25519 operations by using the
13208 public-domain Ed25519-donna by Andrew M. ("floodyberry").
13209 Implements ticket 16467.
13210 - Improve the runtime speed of the ntor handshake by using an
13211 optimized curve25519 basepoint scalarmult implementation from the
13212 public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
13213 ideas by Adam Langley. Implements ticket 9663.
13215 o Major features (Hidden services):
13216 - Hidden services, if using the EntryNodes option, are required to
13217 use more than one EntryNode, in order to avoid a guard discovery
13218 attack. (This would only affect people who had configured hidden
13219 services and manually specified the EntryNodes option with a
13220 single entry-node. The impact was that it would be easy to
13221 remotely identify the guard node used by such a hidden service.
13222 See ticket for more information.) Fixes ticket 14917.
13223 - Add the torrc option HiddenServiceNumIntroductionPoints, to
13224 specify a fixed number of introduction points. Its maximum value
13225 is 10 and default is 3. Using this option can increase a hidden
13226 service's reliability under load, at the cost of making it more
13227 visible that the hidden service is facing extra load. Closes
13229 - Remove the adaptive algorithm for choosing the number of
13230 introduction points, which used to change the number of
13231 introduction points (poorly) depending on the number of
13232 connections the HS sees. Closes ticket 4862.
13234 o Major features (onion key cross-certification):
13235 - Relay descriptors now include signatures of their own identity
13236 keys, made using the TAP and ntor onion keys. These signatures
13237 allow relays to prove ownership of their own onion keys. Because
13238 of this change, microdescriptors will no longer need to include
13239 RSA identity keys. Implements proposal 228; closes ticket 12499.
13241 o Major bugfixes (client-side privacy, also in 0.2.6.9):
13242 - Properly separate out each SOCKSPort when applying stream
13243 isolation. The error occurred because each port's session group
13244 was being overwritten by a default value when the listener
13245 connection was initialized. Fixes bug 16247; bugfix on
13246 0.2.6.3-alpha. Patch by "jojelino".
13248 o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
13249 - Stop refusing to store updated hidden service descriptors on a
13250 client. This reverts commit 9407040c59218 (which indeed fixed bug
13251 14219, but introduced a major hidden service reachability
13252 regression detailed in bug 16381). This is a temporary fix since
13253 we can live with the minor issue in bug 14219 (it just results in
13254 some load on the network) but the regression of 16381 is too much
13255 of a setback. First-round fix for bug 16381; bugfix
13258 o Major bugfixes (hidden services):
13259 - Revert commit that made directory authorities assign the HSDir
13260 flag to relays without a DirPort; this was bad because such relays
13261 can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
13263 - When cannibalizing a circuit for an introduction point, always
13264 extend to the chosen exit node (creating a 4 hop circuit).
13265 Previously Tor would use the current circuit exit node, which
13266 changed the original choice of introduction point, and could cause
13267 the hidden service to skip excluded introduction points or
13268 reconnect to a skipped introduction point. Fixes bug 16260; bugfix
13271 o Major bugfixes (memory leaks):
13272 - Fix a memory leak in ed25519 batch signature checking. Fixes bug
13273 17398; bugfix on 0.2.6.1-alpha.
13275 o Major bugfixes (open file limit):
13276 - The open file limit wasn't checked before calling
13277 tor_accept_socket_nonblocking(), which would make Tor exceed the
13278 limit. Now, before opening a new socket, Tor validates the open
13279 file limit just before, and if the max has been reached, return an
13280 error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
13282 o Major bugfixes (security, correctness):
13283 - Fix an error that could cause us to read 4 bytes before the
13284 beginning of an openssl string. This bug could be used to cause
13285 Tor to crash on systems with unusual malloc implementations, or
13286 systems with unusual hardening installed. Fixes bug 17404; bugfix
13289 o Major bugfixes (stability, also in 0.2.6.10):
13290 - Stop crashing with an assertion failure when parsing certain kinds
13291 of malformed or truncated microdescriptors. Fixes bug 16400;
13292 bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
13293 by "cypherpunks_backup".
13294 - Stop random client-side assertion failures that could occur when
13295 connecting to a busy hidden service, or connecting to a hidden
13296 service while a NEWNYM is in progress. Fixes bug 16013; bugfix
13299 o Minor features (client, SOCKS):
13300 - Add GroupWritable and WorldWritable options to unix-socket based
13301 SocksPort and ControlPort options. These options apply to a single
13302 socket, and override {Control,Socks}SocketsGroupWritable. Closes
13304 - Relax the validation done to hostnames in SOCKS5 requests, and
13305 allow a single trailing '.' to cope with clients that pass FQDNs
13306 using that syntax to explicitly indicate that the domain name is
13307 fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
13308 - Relax the validation of hostnames in SOCKS5 requests, allowing the
13309 character '_' to appear, in order to cope with domains observed in
13310 the wild that are serving non-RFC compliant records. Resolves
13313 o Minor features (client-side privacy):
13314 - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
13315 lifespan when IsolateSOCKSAuth and streams with SOCKS
13316 authentication are attached to the circuit. This allows
13317 applications like TorBrowser to manage circuit lifetime on their
13318 own. Implements feature 15482.
13319 - When logging malformed hostnames from SOCKS5 requests, respect
13320 SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
13322 o Minor features (clock-jump tolerance):
13323 - Recover better when our clock jumps back many hours, like might
13324 happen for Tails or Whonix users who start with a very wrong
13325 hardware clock, use Tor to discover a more accurate time, and then
13326 fix their clock. Resolves part of ticket 8766.
13328 o Minor features (command-line interface):
13329 - Make --hash-password imply --hush to prevent unnecessary noise.
13330 Closes ticket 15542. Patch from "cypherpunks".
13331 - Print a warning whenever we find a relative file path being used
13332 as torrc option. Resolves issue 14018.
13334 o Minor features (compilation):
13335 - Give a warning as early as possible when trying to build with an
13336 unsupported OpenSSL version. Closes ticket 16901.
13337 - Use C99 variadic macros when the compiler is not GCC. This avoids
13338 failing compilations on MSVC, and fixes a log-file-based race
13339 condition in our old workarounds. Original patch from Gisle Vanem.
13341 o Minor features (control protocol):
13342 - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
13343 the control protocol. Resolves ticket 15358.
13345 o Minor features (controller):
13346 - Add DirAuthority lines for default directory authorities to the
13347 output of the "GETINFO config/defaults" command if not already
13348 present. Implements ticket 14840.
13349 - Controllers can now use "GETINFO hs/client/desc/id/..." to
13350 retrieve items from the client's hidden service descriptor cache.
13351 Closes ticket 14845.
13352 - Implement a new controller command "GETINFO status/fresh-relay-
13353 descs" to fetch a descriptor/extrainfo pair that was generated on
13354 demand just for the controller's use. Implements ticket 14784.
13356 o Minor features (directory authorities):
13357 - Directory authorities no longer vote against the "Fast", "Stable",
13358 and "HSDir" flags just because they were going to vote against
13359 "Running": if the consensus turns out to be that the router was
13360 running, then the authority's vote should count. Patch from Peter
13361 Retzlaff; closes issue 8712.
13363 o Minor features (directory authorities, security, also in 0.2.6.9):
13364 - The HSDir flag given by authorities now requires the Stable flag.
13365 For the current network, this results in going from 2887 to 2806
13366 HSDirs. Also, it makes it harder for an attacker to launch a sybil
13367 attack by raising the effort for a relay to become Stable to
13368 require at the very least 7 days, while maintaining the 96 hours
13369 uptime requirement for HSDir. Implements ticket 8243.
13371 o Minor features (DoS-resistance):
13372 - Make it harder for attackers to overload hidden services with
13373 introductions, by blocking multiple introduction requests on the
13374 same circuit. Resolves ticket 15515.
13376 o Minor features (geoip):
13377 - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
13380 o Minor features (hidden services):
13381 - Add the new options "HiddenServiceMaxStreams" and
13382 "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
13383 limit the maximum number of simultaneous streams per circuit, and
13384 optionally tear down the circuit when the limit is exceeded. Part
13386 - Client now uses an introduction point failure cache to know when
13387 to fetch or keep a descriptor in their cache. Previously, failures
13388 were recorded implicitly, but not explicitly remembered. Closes
13390 - Relays need to have the Fast flag to get the HSDir flag. As this
13391 is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
13392 drop. This change should make some attacks against the hidden
13393 service directory system harder. Fixes ticket 15963.
13394 - Turn on hidden service statistics collection by setting the torrc
13395 option HiddenServiceStatistics to "1" by default. (This keeps
13396 track only of the fraction of traffic used by hidden services, and
13397 the total number of hidden services in existence.) Closes
13399 - To avoid leaking HS popularity, don't cycle the introduction point
13400 when we've handled a fixed number of INTRODUCE2 cells but instead
13401 cycle it when a random number of introductions is reached, thus
13402 making it more difficult for an attacker to find out the amount of
13403 clients that have used the introduction point for a specific HS.
13404 Closes ticket 15745.
13406 o Minor features (logging):
13407 - Include the Tor version in all LD_BUG log messages, since people
13408 tend to cut and paste those into the bugtracker. Implements
13411 o Minor features (pluggable transports):
13412 - When launching managed pluggable transports on Linux systems,
13413 attempt to have the kernel deliver a SIGTERM on tor exit if the
13414 pluggable transport process is still running. Resolves
13416 - When launching managed pluggable transports, setup a valid open
13417 stdin in the child process that can be used to detect if tor has
13418 terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
13419 can be used by implementations to detect this new behavior.
13420 Resolves ticket 15435.
13422 o Minor bugfixes (torrc exit policies):
13423 - In each instance above, usage advice is provided to avoid the
13424 message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
13425 16069; bugfix on 0.2.4.7-alpha.
13426 - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
13427 produce IPv6 wildcard addresses. Previously they would produce
13428 both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
13429 of bug 16069; bugfix on 0.2.4.7-alpha.
13430 - When parsing torrc ExitPolicies, we now issue an info-level
13431 message when expanding an "accept/reject *" line to include both
13432 IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
13433 - When parsing torrc ExitPolicies, we now warn for a number of cases
13434 where the user's intent is likely to differ from Tor's actual
13435 behavior. These include: using an IPv4 address with an accept6 or
13436 reject6 line; using "private" on an accept6 or reject6 line; and
13437 including any ExitPolicy lines after accept *:* or reject *:*.
13438 Related to ticket 16069.
13440 o Minor bugfixes (command-line interface):
13441 - When "--quiet" is provided along with "--validate-config", do not
13442 write anything to stdout on success. Fixes bug 14994; bugfix
13444 - When complaining about bad arguments to "--dump-config", use
13445 stderr, not stdout.
13446 - Print usage information for --dump-config when it is used without
13447 an argument. Also, fix the error message to use different wording
13448 and add newline at the end. Fixes bug 15541; bugfix
13451 o Minor bugfixes (compilation):
13452 - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
13453 bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
13454 - Repair compilation with the most recent (unreleased, alpha)
13455 vesions of OpenSSL 1.1. Fixes part of ticket 17237.
13457 o Minor bugfixes (compilation, also in 0.2.6.9):
13458 - Build with --enable-systemd correctly when libsystemd is
13459 installed, but systemd is not. Fixes bug 16164; bugfix on
13460 0.2.6.3-alpha. Patch from Peter Palfrader.
13462 o Minor bugfixes (configuration, unit tests):
13463 - Only add the default fallback directories when the DirAuthorities,
13464 AlternateDirAuthority, and FallbackDir directory config options
13465 are set to their defaults. The default fallback directory list is
13466 currently empty, this fix will only change tor's behavior when it
13467 has default fallback directories. Includes unit tests for
13468 consider_adding_dir_servers(). Fixes bug 15642; bugfix on
13469 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
13471 o Minor bugfixes (controller):
13472 - Add the descriptor ID in each HS_DESC control event. It was
13473 missing, but specified in control-spec.txt. Fixes bug 15881;
13474 bugfix on 0.2.5.2-alpha.
13476 o Minor bugfixes (correctness):
13477 - For correctness, avoid modifying a constant string in
13478 handle_control_postdescriptor. Fixes bug 15546; bugfix
13480 - Remove side-effects from tor_assert() calls. This was harmless,
13481 because we never disable assertions, but it is bad style and
13482 unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
13484 - When calling channel_free_list(), avoid calling smartlist_remove()
13485 while inside a FOREACH loop. This partially reverts commit
13486 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
13487 incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
13489 o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
13490 - Check for failures from crypto_early_init, and refuse to continue.
13491 A previous typo meant that we could keep going with an
13492 uninitialized crypto library, and would have OpenSSL initialize
13493 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
13494 when implementing ticket 4900. Patch by "teor".
13496 o Minor bugfixes (hidden service):
13497 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
13498 a client authorized hidden service. Fixes bug 15823; bugfix
13500 - Remove an extraneous newline character from the end of hidden
13501 service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
13503 o Minor bugfixes (Linux seccomp2 sandbox):
13504 - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
13505 defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
13506 - Allow bridge authorities to run correctly under the seccomp2
13507 sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
13508 - Add the "hidserv-stats" filename to our sandbox filter for the
13509 HiddenServiceStatistics option to work properly. Fixes bug 17354;
13510 bugfix on 0.2.6.2-alpha. Patch from David Goulet.
13512 o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
13513 - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
13514 these when eventfd2() support is missing. Fixes bug 16363; bugfix
13515 on 0.2.6.3-alpha. Patch from "teor".
13517 o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
13518 - Allow systemd connections to work with the Linux seccomp2 sandbox
13519 code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
13521 - Fix sandboxing to work when running as a relay, by allowing the
13522 renaming of secret_id_key, and allowing the eventfd2 and futex
13523 syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
13526 o Minor bugfixes (logging):
13527 - When building Tor under Clang, do not include an extra set of
13528 parentheses in log messages that include function names. Fixes bug
13529 15269; bugfix on every released version of Tor when compiled with
13530 recent enough Clang.
13532 o Minor bugfixes (network):
13533 - When attempting to use fallback technique for network interface
13534 lookup, disregard loopback and multicast addresses since they are
13535 unsuitable for public communications.
13537 o Minor bugfixes (open file limit):
13538 - Fix set_max_file_descriptors() to set by default the max open file
13539 limit to the current limit when setrlimit() fails. Fixes bug
13540 16274; bugfix on tor- 0.2.0.10-alpha. Patch by dgoulet.
13542 o Minor bugfixes (portability):
13543 - Check correctly for Windows socket errors in the workqueue
13544 backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
13545 - Try harder to normalize the exit status of the Tor process to the
13546 standard-provided range. Fixes bug 16975; bugfix on every version
13548 - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
13549 of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak.
13551 o Minor bugfixes (relay):
13552 - Ensure that worker threads actually exit when a fatal error or
13553 shutdown is indicated. This fix doesn't currently affect the
13554 behavior of Tor, because Tor workers never indicates fatal error
13555 or shutdown except in the unit tests. Fixes bug 16868; bugfix
13557 - Fix a rarely-encountered memory leak when failing to initialize
13558 the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
13559 from "cypherpunks".
13560 - Unblock threads before releasing the work queue mutex to ensure
13561 predictable scheduling behavior. Fixes bug 16644; bugfix
13564 o Minor bugfixes (security, exit policies):
13565 - ExitPolicyRejectPrivate now also rejects the relay's published
13566 IPv6 address (if any), and any publicly routable IPv4 or IPv6
13567 addresses on any local interfaces. ticket 17027. Patch by "teor".
13568 Fixes bug 17027; bugfix on 0.2.0.11-alpha.
13570 o Minor bugfixes (statistics):
13571 - Disregard the ConnDirectionStatistics torrc options when Tor is
13572 not a relay since in that mode of operation no sensible data is
13573 being collected and because Tor might run into measurement hiccups
13574 when running as a client for some time, then becoming a relay.
13575 Fixes bug 15604; bugfix on 0.2.2.35.
13577 o Minor bugfixes (systemd):
13578 - Tor's systemd unit file no longer contains extraneous spaces.
13579 These spaces would sometimes confuse tools like deb-systemd-
13580 helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
13582 o Minor bugfixes (test networks):
13583 - When self-testing reachability, use ExtendAllowPrivateAddresses to
13584 determine if local/private addresses imply reachability. The
13585 previous fix used TestingTorNetwork, which implies
13586 ExtendAllowPrivateAddresses, but this excluded rare configurations
13587 where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
13588 not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
13589 issue discovered by CJ Ess.
13591 o Minor bugfixes (tests, also in 0.2.6.9):
13592 - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
13593 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
13595 o Code simplification and refactoring:
13596 - Change the function that's called when we need to retry all
13597 downloads so that it only reschedules the downloads to happen
13598 immediately, rather than launching them all at once itself. This
13599 further simplifies Tor's callgraph.
13600 - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
13601 to ensure they remain consistent and visible everywhere.
13602 - Move some format-parsing functions out of crypto.c and
13603 crypto_curve25519.c into crypto_format.c and/or util_format.c.
13604 - Move the client-only parts of init_keys() into a separate
13605 function. Closes ticket 16763.
13606 - Move the hacky fallback code out of get_interface_address6() into
13607 separate function and get it covered with unit-tests. Resolves
13609 - Refactor hidden service client-side cache lookup to intelligently
13610 report its various failure cases, and disentangle failure cases
13611 involving a lack of introduction points. Closes ticket 14391.
13612 - Remove some vestigial workarounds for the MSVC6 compiler. We
13613 haven't supported that in ages.
13614 - Remove the unused "nulterminate" argument from buf_pullup().
13615 - Simplify the microdesc_free() implementation so that it no longer
13616 appears (to code analysis tools) to potentially invoke a huge
13617 suite of other microdesc functions.
13618 - Simply the control graph further by deferring the inner body of
13619 directory_all_unreachable() into a callback. Closes ticket 16762.
13620 - The link authentication code has been refactored for better
13621 testability and reliability. It now uses code generated with the
13622 "trunnel" binary encoding generator, to reduce the risk of bugs
13623 due to programmer error. Done as part of ticket 12498.
13624 - Treat the loss of an owning controller as equivalent to a SIGTERM
13625 signal. This removes a tiny amount of duplicated code, and
13626 simplifies our callgraph. Closes ticket 16788.
13627 - Use our own Base64 encoder instead of OpenSSL's, to allow more
13628 control over the output. Part of ticket 15652.
13629 - When generating an event to send to the controller, we no longer
13630 put the event over the network immediately. Instead, we queue
13631 these events, and use a Libevent callback to deliver them. This
13632 change simplifies Tor's callgraph by reducing the number of
13633 functions from which all other Tor functions are reachable. Closes
13635 - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
13636 that try to scan or compile every file on Unix won't decide that
13640 - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
13641 - Improve the descriptions of statistics-related torrc options in
13642 the manpage to describe rationale and possible uses cases. Fixes
13644 - Improve the layout and formatting of ./configure --help messages.
13645 Closes ticket 15024. Patch from "cypherpunks".
13646 - Include a specific and (hopefully) accurate documentation of the
13647 torrc file's meta-format in doc/torrc_format.txt. This is mainly
13648 of interest to people writing programs to parse or generate torrc
13649 files. This document is not a commitment to long-term
13650 compatibility; some aspects of the current format are a bit
13651 ridiculous. Closes ticket 2325.
13652 - Include the TUNING document in our source tarball. It is referred
13653 to in the ChangeLog and an error message. Fixes bug 16929; bugfix
13655 - Note that HiddenServicePorts can take a unix domain socket. Closes
13657 - Recommend a 40 GB example AccountingMax in torrc.sample rather
13658 than a 4 GB max. Closes ticket 16742.
13659 - Standardize on the term "server descriptor" in the manual page.
13660 Previously, we had used "router descriptor", "server descriptor",
13661 and "relay descriptor" interchangeably. Part of ticket 14987.
13662 - Advise users on how to configure separate IPv4 and IPv6 exit
13663 policies in the manpage and sample torrcs. Related to ticket 16069.
13664 - Fix an error in the manual page and comments for
13665 TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
13666 required "ORPort connectivity". While this is true, it is in no
13667 way unique to the HSDir flag. Of all the flags, only HSDirs need a
13668 DirPort configured in order for the authorities to assign that
13669 particular flag. Patch by "teor". Fixed as part of 14882; bugfix
13671 - Fix the usage message of tor-resolve(1) so that it no longer lists
13672 the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
13675 - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
13676 and always use the internal Base64 decoder. The internal decoder
13677 has been part of tor since 0.2.0.10-alpha, and no one should
13678 be using the OpenSSL one. Part of ticket 15652.
13679 - Remove the 'tor_strclear()' function; use memwipe() instead.
13680 Closes ticket 14922.
13681 - Remove the code that would try to aggressively flush controller
13682 connections while writing to them. This code was introduced in
13683 0.1.2.7-alpha, in order to keep output buffers from exceeding
13684 their limits. But there is no longer a maximum output buffer size,
13685 and flushing data in this way caused some undesirable recursions
13686 in our call graph. Closes ticket 16480.
13687 - The internal pure-C tor-fw-helper tool is now removed from the Tor
13688 distribution, in favor of the pure-Go clone available from
13689 https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
13690 used by the C tor-fw-helper are not, in our opinion, very
13691 confidence- inspiring in their secure-programming techniques.
13692 Closes ticket 13338.
13694 o Removed features:
13695 - Remove the (seldom-used) DynamicDHGroups feature. For anti-
13696 fingerprinting we now recommend pluggable transports; for forward-
13697 secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
13698 - Remove the HidServDirectoryV2 option. Now all relays offer to
13699 store hidden service descriptors. Related to 16543.
13700 - Remove the VoteOnHidServDirectoriesV2 option, since all
13701 authorities have long set it to 1. Closes ticket 16543.
13702 - Remove the undocumented "--digests" command-line option. It
13703 complicated our build process, caused subtle build issues on
13704 multiple platforms, and is now redundant since we started
13705 including git version identifiers. Closes ticket 14742.
13706 - Tor no longer contains checks for ancient directory cache versions
13707 that didn't know about microdescriptors.
13708 - Tor no longer contains workarounds for stat files generated by
13709 super-old versions of Tor that didn't choose guards sensibly.
13712 - The test-network.sh script now supports performance testing.
13713 Requires corresponding chutney performance testing changes. Patch
13714 by "teor". Closes ticket 14175.
13715 - Add a new set of callgraph analysis scripts that use clang to
13716 produce a list of which Tor functions are reachable from which
13717 other Tor functions. We're planning to use these to help simplify
13718 our code structure by identifying illogical dependencies.
13719 - Add new 'test-full' and 'test-full-online' targets to run all
13720 tests, including integration tests with stem and chutney.
13721 - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
13722 by-side in the same parent directory. Closes ticket 16903. Patch
13724 - Document use of coverity, clang static analyzer, and clang dynamic
13725 undefined behavior and address sanitizers in doc/HACKING. Include
13726 detailed usage instructions in the blacklist. Patch by "teor".
13727 Closes ticket 15817.
13728 - Make "bridges+hs" the default test network. This tests almost all
13729 tor functionality during make test-network, while allowing tests
13730 to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
13731 test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
13732 (chutney). Patches by "teor".
13733 - Make the test-workqueue test work on Windows by initializing the
13734 network before we begin.
13735 - New make target (make test-network-all) to run multiple applicable
13736 chutney test cases. Patch from Teor; closes 16953.
13737 - Now that OpenSSL has its own scrypt implementation, add an unit
13738 test that checks for interoperability between libscrypt_scrypt()
13739 and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
13740 and rely on EVP_PBE_scrypt() whenever possible. Resolves
13742 - The link authentication protocol code now has extensive tests.
13743 - The relay descriptor signature testing code now has
13745 - The test_workqueue program now runs faster, and is enabled by
13746 default as a part of "make check".
13747 - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
13748 functions in dns.c. Implements a portion of ticket 16831.
13749 - Use environment variables rather than autoconf substitutions to
13750 send variables from the build system to the test scripts. This
13751 change should be easier to maintain, and cause 'make distcheck' to
13752 work better than before. Fixes bug 17148.
13753 - When building Tor with testing coverage enabled, run Chutney tests
13754 (if any) using the 'tor-cov' coverage binary.
13755 - When running test-network or test-stem, check for the absence of
13756 stem/chutney before doing any build operations.
13757 - Add a test to verify that the compiler does not eliminate our
13758 memwipe() implementation. Closes ticket 15377.
13759 - Add make rule `check-changes` to verify the format of changes
13760 files. Closes ticket 15180.
13761 - Add unit tests for control_event_is_interesting(). Add a compile-
13762 time check that the number of events doesn't exceed the capacity
13763 of control_event_t.event_mask. Closes ticket 15431, checks for
13764 bugs similar to 13085. Patch by "teor".
13765 - Command-line argument tests moved to Stem. Resolves ticket 14806.
13766 - Integrate the ntor, backtrace, and zero-length keys tests into the
13767 automake test suite. Closes ticket 15344.
13768 - Remove assertions during builds to determine Tor's test coverage.
13769 We don't want to trigger these even in assertions, so including
13770 them artificially makes our branch coverage look worse than it is.
13771 This patch provides the new test-stem-full and coverage-html-full
13772 configure options. Implements ticket 15400.
13773 - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
13774 explicitly manage consensus flags in testing networks. Patch by
13775 "robgjansen", modified by "teor". Implements part of ticket 14882.
13776 - Check for matching value in server response in ntor_ref.py. Fixes
13777 bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
13779 - Set the severity correctly when testing
13780 get_interface_addresses_ifaddrs() and
13781 get_interface_addresses_win32(), so that the tests fail gracefully
13782 instead of triggering an assertion. Fixes bug 15759; bugfix on
13783 0.2.6.3-alpha. Reported by Nicolas Derive.
13785 Changes in version 0.2.6.10 - 2015-07-12
13786 Tor version 0.2.6.10 fixes some significant stability and hidden
13787 service client bugs, bulletproofs the cryptography init process, and
13788 fixes a bug when using the sandbox code with some older versions of
13789 Linux. Everyone running an older version, especially an older version
13790 of 0.2.6, should upgrade.
13792 o Major bugfixes (hidden service clients, stability):
13793 - Stop refusing to store updated hidden service descriptors on a
13794 client. This reverts commit 9407040c59218 (which indeed fixed bug
13795 14219, but introduced a major hidden service reachability
13796 regression detailed in bug 16381). This is a temporary fix since
13797 we can live with the minor issue in bug 14219 (it just results in
13798 some load on the network) but the regression of 16381 is too much
13799 of a setback. First-round fix for bug 16381; bugfix
13802 o Major bugfixes (stability):
13803 - Stop crashing with an assertion failure when parsing certain kinds
13804 of malformed or truncated microdescriptors. Fixes bug 16400;
13805 bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
13806 by "cypherpunks_backup".
13807 - Stop random client-side assertion failures that could occur when
13808 connecting to a busy hidden service, or connecting to a hidden
13809 service while a NEWNYM is in progress. Fixes bug 16013; bugfix
13812 o Minor features (geoip):
13813 - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
13814 - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
13816 o Minor bugfixes (crypto error-handling):
13817 - Check for failures from crypto_early_init, and refuse to continue.
13818 A previous typo meant that we could keep going with an
13819 uninitialized crypto library, and would have OpenSSL initialize
13820 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
13821 when implementing ticket 4900. Patch by "teor".
13823 o Minor bugfixes (Linux seccomp2 sandbox):
13824 - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
13825 these when eventfd2() support is missing. Fixes bug 16363; bugfix
13826 on 0.2.6.3-alpha. Patch from "teor".
13829 Changes in version 0.2.6.9 - 2015-06-11
13830 Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
13831 requirements for receiving an HSDir flag, and addresses some other small
13832 bugs in the systemd and sandbox code. Clients using circuit isolation
13833 should upgrade; all directory authorities should upgrade.
13835 o Major bugfixes (client-side privacy):
13836 - Properly separate out each SOCKSPort when applying stream
13837 isolation. The error occurred because each port's session group was
13838 being overwritten by a default value when the listener connection
13839 was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
13842 o Minor feature (directory authorities, security):
13843 - The HSDir flag given by authorities now requires the Stable flag.
13844 For the current network, this results in going from 2887 to 2806
13845 HSDirs. Also, it makes it harder for an attacker to launch a sybil
13846 attack by raising the effort for a relay to become Stable which
13847 takes at the very least 7 days to do so and by keeping the 96
13848 hours uptime requirement for HSDir. Implements ticket 8243.
13850 o Minor bugfixes (compilation):
13851 - Build with --enable-systemd correctly when libsystemd is
13852 installed, but systemd is not. Fixes bug 16164; bugfix on
13853 0.2.6.3-alpha. Patch from Peter Palfrader.
13855 o Minor bugfixes (Linux seccomp2 sandbox):
13856 - Fix sandboxing to work when running as a relaymby renaming of
13857 secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
13858 bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
13859 - Allow systemd connections to work with the Linux seccomp2 sandbox
13860 code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
13863 o Minor bugfixes (tests):
13864 - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
13865 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
13868 Changes in version 0.2.6.8 - 2015-05-21
13869 Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
13870 fixes an authority-side bug in assigning the HSDir flag. All directory
13871 authorities should upgrade.
13873 o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
13874 - Revert commit that made directory authorities assign the HSDir
13875 flag to relays without a DirPort; this was bad because such relays
13876 can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
13879 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
13880 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
13881 a client authorized hidden service. Fixes bug 15823; bugfix
13884 o Minor features (geoip):
13885 - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
13886 - Update geoip6 to the April 8 2015 Maxmind GeoLite2
13890 Changes in version 0.2.6.7 - 2015-04-06
13891 Tor 0.2.6.7 fixes two security issues that could be used by an
13892 attacker to crash hidden services, or crash clients visiting hidden
13893 services. Hidden services should upgrade as soon as possible; clients
13894 should upgrade whenever packages become available.
13896 This release also contains two simple improvements to make hidden
13897 services a bit less vulnerable to denial-of-service attacks.
13899 o Major bugfixes (security, hidden service):
13900 - Fix an issue that would allow a malicious client to trigger an
13901 assertion failure and halt a hidden service. Fixes bug 15600;
13902 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
13903 - Fix a bug that could cause a client to crash with an assertion
13904 failure when parsing a malformed hidden service descriptor. Fixes
13905 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
13907 o Minor features (DoS-resistance, hidden service):
13908 - Introduction points no longer allow multiple INTRODUCE1 cells to
13909 arrive on the same circuit. This should make it more expensive for
13910 attackers to overwhelm hidden services with introductions.
13911 Resolves ticket 15515.
13912 - Decrease the amount of reattempts that a hidden service performs
13913 when its rendezvous circuits fail. This reduces the computational
13914 cost for running a hidden service under heavy load. Resolves
13918 Changes in version 0.2.5.12 - 2015-04-06
13919 Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
13920 could be used by an attacker to crash hidden services, or crash clients
13921 visiting hidden services. Hidden services should upgrade as soon as
13922 possible; clients should upgrade whenever packages become available.
13924 This release also backports a simple improvement to make hidden
13925 services a bit less vulnerable to denial-of-service attacks.
13927 o Major bugfixes (security, hidden service):
13928 - Fix an issue that would allow a malicious client to trigger an
13929 assertion failure and halt a hidden service. Fixes bug 15600;
13930 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
13931 - Fix a bug that could cause a client to crash with an assertion
13932 failure when parsing a malformed hidden service descriptor. Fixes
13933 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
13935 o Minor features (DoS-resistance, hidden service):
13936 - Introduction points no longer allow multiple INTRODUCE1 cells to
13937 arrive on the same circuit. This should make it more expensive for
13938 attackers to overwhelm hidden services with introductions.
13939 Resolves ticket 15515.
13942 Changes in version 0.2.4.27 - 2015-04-06
13943 Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
13944 could be used by an attacker to crash hidden services, or crash clients
13945 visiting hidden services. Hidden services should upgrade as soon as
13946 possible; clients should upgrade whenever packages become available.
13948 This release also backports a simple improvement to make hidden
13949 services a bit less vulnerable to denial-of-service attacks.
13951 o Major bugfixes (security, hidden service):
13952 - Fix an issue that would allow a malicious client to trigger an
13953 assertion failure and halt a hidden service. Fixes bug 15600;
13954 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
13955 - Fix a bug that could cause a client to crash with an assertion
13956 failure when parsing a malformed hidden service descriptor. Fixes
13957 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
13959 o Minor features (DoS-resistance, hidden service):
13960 - Introduction points no longer allow multiple INTRODUCE1 cells to
13961 arrive on the same circuit. This should make it more expensive for
13962 attackers to overwhelm hidden services with introductions.
13963 Resolves ticket 15515.
13966 Changes in version 0.2.6.6 - 2015-03-24
13967 Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
13969 It adds numerous safety, security, correctness, and performance
13970 improvements. Client programs can be configured to use more kinds of
13971 sockets, AutomapHosts works better, the multithreading backend is
13972 improved, cell transmission is refactored, test coverage is much
13973 higher, more denial-of-service attacks are handled, guard selection is
13974 improved to handle long-term guards better, pluggable transports
13975 should work a bit better, and some annoying hidden service performance
13976 bugs should be addressed.
13978 o New compiler and system requirements:
13979 - Tor 0.2.6.x requires that your compiler support more of the C99
13980 language standard than before. The 'configure' script now detects
13981 whether your compiler supports C99 mid-block declarations and
13982 designated initializers. If it does not, Tor will not compile.
13984 We may revisit this requirement if it turns out that a significant
13985 number of people need to build Tor with compilers that don't
13986 bother implementing a 15-year-old standard. Closes ticket 13233.
13987 - Tor no longer supports systems without threading support. When we
13988 began working on Tor, there were several systems that didn't have
13989 threads, or where the thread support wasn't able to run the
13990 threads of a single process on multiple CPUs. That no longer
13991 holds: every system where Tor needs to run well now has threading
13992 support. Resolves ticket 12439.
13994 o Deprecated versions and removed support:
13995 - Tor relays older than 0.2.4.18-rc are no longer allowed to
13996 advertise themselves on the network. Closes ticket 13555.
13997 - Tor clients no longer support connecting to hidden services
13998 running on Tor 0.2.2.x and earlier; the Support022HiddenServices
13999 option has been removed. (There shouldn't be any hidden services
14000 running these versions on the network.) Closes ticket 7803.
14002 o Directory authority changes:
14003 - The directory authority Faravahar has a new IP address. This
14004 closes ticket 14487.
14005 - Remove turtles as a directory authority.
14006 - Add longclaw as a new (v3) directory authority. This implements
14007 ticket 13296. This keeps the directory authority count at 9.
14009 o Major features (bridges):
14010 - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
14011 transports if they are configured via the "TOR_PT_PROXY"
14012 environment variable. Implements proposal 232. Resolves
14015 o Major features (changed defaults):
14016 - Prevent relay operators from unintentionally running exits: When a
14017 relay is configured as an exit node, we now warn the user unless
14018 the "ExitRelay" option is set to 1. We warn even more loudly if
14019 the relay is configured with the default exit policy, since this
14020 can indicate accidental misconfiguration. Setting "ExitRelay 0"
14021 stops Tor from running as an exit relay. Closes ticket 10067.
14023 o Major features (client performance, hidden services):
14024 - Allow clients to use optimistic data when connecting to a hidden
14025 service, which should remove a round-trip from hidden service
14026 initialization. See proposal 181 for details. Implements
14029 o Major features (directory system):
14030 - Upon receiving an unparseable directory object, if its digest
14031 matches what we expected, then don't try to download it again.
14032 Previously, when we got a descriptor we didn't like, we would keep
14033 trying to download it over and over. Closes ticket 11243.
14034 - When downloading server- or microdescriptors from a directory
14035 server, we no longer launch multiple simultaneous requests to the
14036 same server. This reduces load on the directory servers,
14037 especially when directory guards are in use. Closes ticket 9969.
14038 - When downloading server- or microdescriptors over a tunneled
14039 connection, do not limit the length of our requests to what the
14040 Squid proxy is willing to handle. Part of ticket 9969.
14041 - Authorities can now vote on the correct digests and latest
14042 versions for different software packages. This allows packages
14043 that include Tor to use the Tor authority system as a way to get
14044 notified of updates and their correct digests. Implements proposal
14045 227. Closes ticket 10395.
14047 o Major features (guards):
14048 - Introduce the Guardfraction feature to improves load balancing on
14049 guard nodes. Specifically, it aims to reduce the traffic gap that
14050 guard nodes experience when they first get the Guard flag. This is
14051 a required step if we want to increase the guard lifetime to 9
14052 months or greater. Closes ticket 9321.
14054 o Major features (hidden services):
14055 - Make HS port scanning more difficult by immediately closing the
14056 circuit when a user attempts to connect to a nonexistent port.
14057 Closes ticket 13667.
14058 - Add a HiddenServiceStatistics option that allows Tor relays to
14059 gather and publish statistics about the overall size and volume of
14060 hidden service usage. Specifically, when this option is turned on,
14061 an HSDir will publish an approximate number of hidden services
14062 that have published descriptors to it the past 24 hours. Also, if
14063 a relay has acted as a hidden service rendezvous point, it will
14064 publish the approximate amount of rendezvous cells it has relayed
14065 the past 24 hours. The statistics themselves are obfuscated so
14066 that the exact values cannot be derived. For more details see
14067 proposal 238, "Better hidden service stats from Tor relays". This
14068 feature is currently disabled by default. Implements feature 13192.
14070 o Major features (performance):
14071 - Make the CPU worker implementation more efficient by avoiding the
14072 kernel and lengthening pipelines. The original implementation used
14073 sockets to transfer data from the main thread to the workers, and
14074 didn't allow any thread to be assigned more than a single piece of
14075 work at once. The new implementation avoids communications
14076 overhead by making requests in shared memory, avoiding kernel IO
14077 where possible, and keeping more requests in flight at once.
14078 Implements ticket 9682.
14080 o Major features (relay):
14081 - Raise the minimum acceptable configured bandwidth rate for bridges
14082 to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
14083 20 KiB/sec.) Closes ticket 13822.
14084 - Complete revision of the code that relays use to decide which cell
14085 to send next. Formerly, we selected the best circuit to write on
14086 each channel, but we didn't select among channels in any
14087 sophisticated way. Now, we choose the best circuits globally from
14088 among those whose channels are ready to deliver traffic.
14090 This patch implements a new inter-cmux comparison API, a global
14091 high/low watermark mechanism and a global scheduler loop for
14092 transmission prioritization across all channels as well as among
14093 circuits on one channel. This schedule is currently tuned to
14094 (tolerantly) avoid making changes in network performance, but it
14095 should form the basis for major circuit performance increases in
14096 the future. Code by Andrea; tuning by Rob Jansen; implements
14099 o Major features (sample torrc):
14100 - Add a new, infrequently-changed "torrc.minimal". This file is
14101 similar to torrc.sample, but it will change as infrequently as
14102 possible, for the benefit of users whose systems prompt them for
14103 intervention whenever a default configuration file is changed.
14104 Making this change allows us to update torrc.sample to be a more
14105 generally useful "sample torrc".
14107 o Major features (security, unix domain sockets):
14108 - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
14109 applications can reach Tor without having to create AF_INET or
14110 AF_INET6 sockets, meaning they can completely disable their
14111 ability to make non-Tor network connections. To create a socket of
14112 this type, use "SocksPort unix:/path/to/socket". Implements
14114 - Support mapping hidden service virtual ports to AF_UNIX sockets.
14115 The syntax is "HiddenServicePort 80 unix:/path/to/socket".
14116 Implements ticket 11485.
14118 o Major bugfixes (client, automap):
14119 - Repair automapping with IPv6 addresses. This automapping should
14120 have worked previously, but one piece of debugging code that we
14121 inserted to detect a regression actually caused the regression to
14122 manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
14123 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
14126 o Major bugfixes (crash, OSX, security):
14127 - Fix a remote denial-of-service opportunity caused by a bug in
14128 OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
14131 o Major bugfixes (directory authorities):
14132 - Do not assign the HSDir flag to relays if they are not Valid, or
14133 currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
14135 o Major bugfixes (directory bandwidth performance):
14136 - Don't flush the zlib buffer aggressively when compressing
14137 directory information for clients. This should save about 7% of
14138 the bandwidth currently used for compressed descriptors and
14139 microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
14141 o Major bugfixes (exit node stability):
14142 - Fix an assertion failure that could occur under high DNS load.
14143 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
14144 diagnosed and fixed by "cypherpunks".
14146 o Major bugfixes (FreeBSD IPFW transparent proxy):
14147 - Fix address detection with FreeBSD transparent proxies, when
14148 "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
14151 o Major bugfixes (hidden services):
14152 - When closing an introduction circuit that was opened in parallel
14153 with others, don't mark the introduction point as unreachable.
14154 Previously, the first successful connection to an introduction
14155 point would make the other introduction points get marked as
14156 having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
14158 o Major bugfixes (Linux seccomp2 sandbox):
14159 - Upon receiving sighup with the seccomp2 sandbox enabled, do not
14160 crash during attempts to call wait4. Fixes bug 15088; bugfix on
14161 0.2.5.1-alpha. Patch from "sanic".
14163 o Major bugfixes (mixed relay-client operation):
14164 - When running as a relay and client at the same time (not
14165 recommended), if we decide not to use a new guard because we want
14166 to retry older guards, only close the locally-originating circuits
14167 passing through that guard. Previously we would close all the
14168 circuits through that guard. Fixes bug 9819; bugfix on
14169 0.2.1.1-alpha. Reported by "skruffy".
14171 o Major bugfixes (pluggable transports):
14172 - Initialize the extended OR Port authentication cookie before
14173 launching pluggable transports. This prevents a race condition
14174 that occurred when server-side pluggable transports would cache the
14175 authentication cookie before it has been (re)generated. Fixes bug
14176 15240; bugfix on 0.2.5.1-alpha.
14178 o Major bugfixes (relay, stability, possible security):
14179 - Fix a bug that could lead to a relay crashing with an assertion
14180 failure if a buffer of exactly the wrong layout is passed to
14181 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
14182 0.2.0.10-alpha. Patch from "cypherpunks".
14183 - Do not assert if the 'data' pointer on a buffer is advanced to the
14184 very end of the buffer; log a BUG message instead. Only assert if
14185 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
14187 o Minor features (build):
14188 - New --disable-system-torrc compile-time option to prevent Tor from
14189 looking for the system-wide torrc or torrc-defaults files.
14190 Resolves ticket 13037.
14192 o Minor features (client):
14193 - Clients are now willing to send optimistic data (before they
14194 receive a 'connected' cell) to relays of any version. (Relays
14195 without support for optimistic data are no longer supported on the
14196 Tor network.) Resolves ticket 13153.
14198 o Minor features (client):
14199 - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
14200 is enabled, reject requests with IP addresses as hostnames.
14201 Resolves ticket 13315.
14203 o Minor features (controller):
14204 - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
14205 write an unscheduled heartbeat message to the log. Implements
14207 - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
14208 events so controllers can observe circuit isolation inputs. Closes
14210 - ControlPort now supports the unix:/path/to/socket syntax as an
14211 alternative to the ControlSocket option, for consistency with
14212 SocksPort and HiddenServicePort. Closes ticket 14451.
14213 - New "GETINFO bw-event-cache" to get information about recent
14214 bandwidth events. Closes ticket 14128. Useful for controllers to
14215 get recent bandwidth history after the fix for ticket 13988.
14216 - Messages about problems in the bootstrap process now include
14217 information about the server we were trying to connect to when we
14218 noticed the problem. Closes ticket 15006.
14220 o Minor features (Denial of service resistance):
14221 - Count the total number of bytes used storing hidden service
14222 descriptors against the value of MaxMemInQueues. If we're low on
14223 memory, and more than 20% of our memory is used holding hidden
14224 service descriptors, free them until no more than 10% of our
14225 memory holds hidden service descriptors. Free the least recently
14226 fetched descriptors first. Resolves ticket 13806.
14227 - When we have recently been under memory pressure (over 3/4 of
14228 MaxMemInQueues is allocated), then allocate smaller zlib objects
14229 for small requests. Closes ticket 11791.
14231 o Minor features (directory authorities):
14232 - Don't list relays with a bandwidth estimate of 0 in the consensus.
14233 Implements a feature proposed during discussion of bug 13000.
14234 - In tor-gencert, report an error if the user provides the same
14235 argument more than once.
14236 - If a directory authority can't find a best consensus method in the
14237 votes that it holds, it now falls back to its favorite consensus
14238 method. Previously, it fell back to method 1. Neither of these is
14239 likely to get enough signatures, but "fall back to favorite"
14240 doesn't require us to maintain support an obsolete consensus
14241 method. Implements part of proposal 215.
14243 o Minor features (geoip):
14244 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
14245 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
14248 o Minor features (guard nodes):
14249 - Reduce the time delay before saving guard status to disk from 10
14250 minutes to 30 seconds (or from one hour to 10 minutes if
14251 AvoidDiskWrites is set). Closes ticket 12485.
14253 o Minor features (heartbeat):
14254 - On relays, report how many connections we negotiated using each
14255 version of the Tor link protocols. This information will let us
14256 know if removing support for very old versions of the Tor
14257 protocols is harming the network. Closes ticket 15212.
14259 o Minor features (hidden service):
14260 - Make Sybil attacks against hidden services harder by changing the
14261 minimum time required to get the HSDir flag from 25 hours up to 96
14262 hours. Addresses ticket 14149.
14263 - New option "HiddenServiceAllowUnknownPorts" to allow hidden
14264 services to disable the anti-scanning feature introduced in
14265 0.2.6.2-alpha. With this option not set, a connection to an
14266 unlisted port closes the circuit. With this option set, only a
14267 RELAY_DONE cell is sent. Closes ticket 14084.
14268 - When re-enabling the network, don't try to build introduction
14269 circuits until we have successfully built a circuit. This makes
14270 hidden services come up faster when the network is re-enabled.
14271 Patch from "akwizgran". Closes ticket 13447.
14272 - When we fail to retrieve a hidden service descriptor, send the
14273 controller an "HS_DESC FAILED" controller event. Implements
14275 - New HiddenServiceDirGroupReadable option to cause hidden service
14276 directories and hostname files to be created group-readable. Patch
14277 from "anon", David Stainton, and "meejah". Closes ticket 11291.
14279 o Minor features (interface):
14280 - Implement "-f -" command-line option to read torrc configuration
14281 from standard input, if you don't want to store the torrc file in
14282 the file system. Implements feature 13865.
14284 o Minor features (logging):
14285 - Add a count of unique clients to the bridge heartbeat message.
14286 Resolves ticket 6852.
14287 - Suppress "router info incompatible with extra info" message when
14288 reading extrainfo documents from cache. (This message got loud
14289 around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
14291 - Elevate hidden service authorized-client message from DEBUG to
14292 INFO. Closes ticket 14015.
14293 - On Unix-like systems, you can now use named pipes as the target of
14294 the Log option, and other options that try to append to files.
14295 Closes ticket 12061. Patch from "carlo von lynX".
14296 - When opening a log file at startup, send it every log message that
14297 we generated between startup and opening it. Previously, log
14298 messages that were generated before opening the log file were only
14299 logged to stdout. Closes ticket 6938.
14300 - Add a TruncateLogFile option to overwrite logs instead of
14301 appending to them. Closes ticket 5583.
14302 - Quiet some log messages in the heartbeat and at startup. Closes
14305 o Minor features (portability, Solaris):
14306 - Threads are no longer disabled by default on Solaris; we believe
14307 that the versions of Solaris with broken threading support are all
14308 obsolete by now. Resolves ticket 9495.
14310 o Minor features (relay):
14311 - Re-check our address after we detect a changed IP address from
14312 getsockname(). This ensures that the controller command "GETINFO
14313 address" will report the correct value. Resolves ticket 11582.
14315 - A new AccountingRule option lets Relays set whether they'd like
14316 AccountingMax to be applied separately to inbound and outbound
14317 traffic, or applied to the sum of inbound and outbound traffic.
14318 Resolves ticket 961. Patch by "chobe".
14319 - When identity keypair is generated for first time, log a
14320 congratulatory message that links to the new relay lifecycle
14321 document. Implements feature 10427.
14323 o Minor features (security, memory wiping):
14324 - Ensure we securely wipe keys from memory after
14325 crypto_digest_get_digest and init_curve25519_keypair_from_file
14326 have finished using them. Resolves ticket 13477.
14328 o Minor features (security, out-of-memory handling):
14329 - When handling an out-of-memory condition, allocate less memory for
14330 temporary data structures. Fixes issue 10115.
14331 - When handling an out-of-memory condition, consider more types of
14332 buffers, including those on directory connections, and zlib
14333 buffers. Resolves ticket 11792.
14335 o Minor features (stability):
14336 - Add assertions in our hash-table iteration code to check for
14337 corrupted values that could cause infinite loops. Closes
14340 o Minor features (systemd):
14341 - Various improvements and modernizations in systemd hardening
14342 support. Closes ticket 13805. Patch from Craig Andrews.
14343 - Where supported, when running with systemd, report successful
14344 startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
14345 - When running with systemd, support systemd watchdog messages. Part
14346 of ticket 11016. Patch by Michael Scherer.
14348 o Minor features (testing networks):
14349 - Add the TestingDirAuthVoteExit option, which lists nodes to assign
14350 the "Exit" flag regardless of their uptime, bandwidth, or exit
14351 policy. TestingTorNetwork must be set for this option to have any
14352 effect. Previously, authorities would take up to 35 minutes to
14353 give nodes the Exit flag in a test network. Partially implements
14355 - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
14356 and the default on a testing network to 2 minutes. Drop the
14357 MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
14358 keep the default on a testing network at 30 seconds. This reduces
14359 HS bootstrap time to around 25 seconds. Also, change the default
14360 time in test-network.sh to match. Closes ticket 13401. Patch
14362 - Create TestingDirAuthVoteHSDir to correspond to
14363 TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
14364 HSDir flag for the listed relays regardless of uptime or ORPort
14365 connectivity. Respects the value of VoteOnHidServDirectoriesV2.
14366 Partial implementation for ticket 14067. Patch by "teor".
14368 o Minor features (tor2web mode):
14369 - Introduce the config option Tor2webRendezvousPoints, which allows
14370 clients in Tor2webMode to select a specific Rendezvous Point to be
14371 used in HS circuits. This might allow better performance for
14372 Tor2Web nodes. Implements ticket 12844.
14374 o Minor features (transparent proxy):
14375 - Update the transparent proxy option checks to allow for both ipfw
14376 and pf on OS X. Closes ticket 14002.
14377 - Use the correct option when using IPv6 with transparent proxy
14378 support on Linux. Resolves 13808. Patch by Francisco Blas
14381 o Minor features (validation):
14382 - Check all date/time values passed to tor_timegm and
14383 parse_rfc1123_time for validity, taking leap years into account.
14384 Improves HTTP header validation. Implemented with bug 13476.
14385 - In correct_tm(), limit the range of values returned by system
14386 localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
14387 This means we don't have to deal with negative or too large dates,
14388 even if a clock is wrong. Otherwise we might fail to read a file
14389 written by us which includes such a date. Fixes bug 13476.
14390 - Stop allowing invalid address patterns like "*/24" that contain
14391 both a wildcard address and a bit prefix length. This affects all
14392 our address-range parsing code. Fixes bug 7484; bugfix
14395 o Minor bugfixes (bridge clients):
14396 - When configured to use a bridge without an identity digest (not
14397 recommended), avoid launching an extra channel to it when
14398 bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
14400 o Minor bugfixes (bridges):
14401 - When DisableNetwork is set, do not launch pluggable transport
14402 plugins, and if any are running, terminate them. Fixes bug 13213;
14403 bugfix on 0.2.3.6-alpha.
14405 o Minor bugfixes (C correctness):
14406 - Fix several instances of possible integer overflow/underflow/NaN.
14407 Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
14409 - In circuit_build_times_calculate_timeout() in circuitstats.c,
14410 avoid dividing by zero in the pareto calculations. This traps
14411 under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
14413 - Fix an integer overflow in format_time_interval(). Fixes bug
14414 13393; bugfix on 0.2.0.10-alpha.
14415 - Set the correct day of year value when the system's localtime(_r)
14416 or gmtime(_r) functions fail to set struct tm. Not externally
14417 visible. Fixes bug 13476; bugfix on 0.0.2pre14.
14418 - Avoid unlikely signed integer overflow in tor_timegm on systems
14419 with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
14421 o Minor bugfixes (certificate handling):
14422 - If an authority operator accidentally makes a signing certificate
14423 with a future publication time, do not discard its real signing
14424 certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
14425 - Remove any old authority certificates that have been superseded
14426 for at least two days. Previously, we would keep superseded
14427 certificates until they expired, if they were published close in
14428 time to the certificate that superseded them. Fixes bug 11454;
14429 bugfix on 0.2.1.8-alpha.
14431 o Minor bugfixes (client):
14432 - Fix smartlist_choose_node_by_bandwidth() so that relays with the
14433 BadExit flag are not considered worthy candidates. Fixes bug
14434 13066; bugfix on 0.1.2.3-alpha.
14435 - Use the consensus schedule for downloading consensuses, and not
14436 the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
14437 - Handle unsupported or malformed SOCKS5 requests properly by
14438 responding with the appropriate error message before closing the
14439 connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
14441 o Minor bugfixes (client, automapping):
14442 - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
14443 no value follows the option. Fixes bug 14142; bugfix on
14444 0.2.4.7-alpha. Patch by "teor".
14445 - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
14446 14195; bugfix on 0.1.0.1-rc.
14447 - Prevent changes to other options from removing the wildcard value
14448 "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
14450 - Allow MapAddress and AutomapHostsOnResolve to work together when
14451 an address is mapped into another address type (like .onion) that
14452 must be automapped at resolve time. Fixes bug 7555; bugfix
14455 o Minor bugfixes (client, bridges):
14456 - When we are using bridges and we had a network connectivity
14457 problem, only retry connecting to our currently configured
14458 bridges, not all bridges we know about and remember using. Fixes
14459 bug 14216; bugfix on 0.2.2.17-alpha.
14461 o Minor bugfixes (client, DNS):
14462 - Report the correct cached DNS expiration times on SOCKS port or in
14463 DNS replies. Previously, we would report everything as "never
14464 expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
14465 - Avoid a small memory leak when we find a cached answer for a
14466 reverse DNS lookup in a client-side DNS cache. (Remember, client-
14467 side DNS caching is off by default, and is not recommended.) Fixes
14468 bug 14259; bugfix on 0.2.0.1-alpha.
14470 o Minor bugfixes (client, IPv6):
14471 - Reject socks requests to literal IPv6 addresses when IPv6Traffic
14472 flag is not set; and not because the NoIPv4Traffic flag was set.
14473 Previously we'd looked at the NoIPv4Traffic flag for both types of
14474 literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
14476 o Minor bugfixes (client, microdescriptors):
14477 - Use a full 256 bits of the SHA256 digest of a microdescriptor when
14478 computing which microdescriptors to download. This keeps us from
14479 erroneous download behavior if two microdescriptor digests ever
14480 have the same first 160 bits. Fixes part of bug 13399; bugfix
14482 - Reset a router's status if its microdescriptor digest changes,
14483 even if the first 160 bits remain the same. Fixes part of bug
14484 13399; bugfix on 0.2.3.1-alpha.
14486 o Minor bugfixes (client, torrc):
14487 - Stop modifying the value of our DirReqStatistics torrc option just
14488 because we're not a bridge or relay. This bug was causing Tor
14489 Browser users to write "DirReqStatistics 0" in their torrc files
14490 as if they had chosen to change the config. Fixes bug 4244; bugfix
14492 - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
14493 that our options have changed every time we SIGHUP. Fixes bug
14494 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
14496 o Minor bugfixes (compilation):
14497 - Fix a compilation warning on s390. Fixes bug 14988; bugfix
14499 - Silence clang warnings under --enable-expensive-hardening,
14500 including implicit truncation of 64 bit values to 32 bit, const
14501 char assignment to self, tautological compare, and additional
14502 parentheses around equality tests. Fixes bug 13577; bugfix
14504 - Fix a clang warning about checking whether an address in the
14505 middle of a structure is NULL. Fixes bug 14001; bugfix
14507 - The address of an array in the middle of a structure will always
14508 be non-NULL. clang recognises this and complains. Disable the
14509 tautologous and redundant check to silence this warning. Fixes bug
14510 14001; bugfix on 0.2.1.2-alpha.
14511 - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
14512 Addresses ticket 14188.
14513 - Build without warnings with the stock OpenSSL srtp.h header, which
14514 has a duplicate declaration of SSL_get_selected_srtp_profile().
14515 Fixes bug 14220; this is OpenSSL's bug, not ours.
14516 - Do not compile any code related to Tor2Web mode when Tor2Web mode
14517 is not enabled at compile time. Previously, this code was included
14518 in a disabled state. See discussion on ticket 12844.
14519 - Allow our configure script to build correctly with autoconf 2.62
14520 again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
14521 - Improve the error message from ./configure to make it clear that
14522 when asciidoc has not been found, the user will have to either add
14523 --disable-asciidoc argument or install asciidoc. Resolves
14526 o Minor bugfixes (controller):
14527 - Report "down" in response to the "GETINFO entry-guards" command
14528 when relays are down with an unreachable_since value. Previously,
14529 we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
14530 - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
14531 14116; bugfix on 0.2.2.9-alpha.
14533 o Minor bugfixes (controller):
14534 - Return an error when the second or later arguments of the
14535 "setevents" controller command are invalid events. Previously we
14536 would return success while silently skipping invalid events. Fixes
14537 bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
14539 o Minor bugfixes (directory authority):
14540 - Allow directory authorities to fetch more data from one another if
14541 they find themselves missing lots of votes. Previously, they had
14542 been bumping against the 10 MB queued data limit. Fixes bug 14261;
14543 bugfix on 0.1.2.5-alpha.
14544 - Do not attempt to download extrainfo documents which we will be
14545 unable to validate with a matching server descriptor. Fixes bug
14546 13762; bugfix on 0.2.0.1-alpha.
14547 - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
14548 control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
14549 - Enlarge the buffer to read bwauth generated files to avoid an
14550 issue when parsing the file in dirserv_read_measured_bandwidths().
14551 Fixes bug 14125; bugfix on 0.2.2.1-alpha.
14552 - When running as a v3 directory authority, advertise that you serve
14553 extra-info documents so that clients who want them can find them
14554 from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
14556 o Minor bugfixes (directory system):
14557 - Always believe that v3 directory authorities serve extra-info
14558 documents, whether they advertise "caches-extra-info" or not.
14559 Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
14560 - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
14561 Previously, directories offering BRIDGE_DIRINFO and some other
14562 flag (i.e. microdescriptors or extrainfo) would be ignored when
14563 looking for bridges. Partially fixes bug 13163; bugfix
14566 o Minor bugfixes (file handling):
14567 - Stop failing when key files are zero-length. Instead, generate new
14568 keys, and overwrite the empty key files. Fixes bug 13111; bugfix
14569 on all versions of Tor. Patch by "teor".
14570 - Stop generating a fresh .old RSA onion key file when the .old file
14571 is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
14572 - Avoid overwriting .old key files with empty key files.
14573 - Skip loading zero-length extrainfo store, router store, stats,
14574 state, and key files.
14575 - Avoid crashing when trying to reload a torrc specified as a
14576 relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
14579 o Minor bugfixes (hidden services):
14580 - Close the introduction circuit when we have no more usable intro
14581 points, instead of waiting for it to time out. This also ensures
14582 that no follow-up HS descriptor fetch is triggered when the
14583 circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
14584 - When fetching a hidden service descriptor for a down service that
14585 was recently up, do not keep refetching until we try the same
14586 replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
14587 - Correctly send a controller event when we find that a rendezvous
14588 circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
14589 - Pre-check directory permissions for new hidden-services to avoid
14590 at least one case of "Bug: Acting on config options left us in a
14591 broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
14592 - When fetching hidden service descriptors, we now check not only
14593 for whether we got the hidden service we had in mind, but also
14594 whether we got the particular descriptors we wanted. This prevents
14595 a class of inefficient but annoying DoS attacks by hidden service
14596 directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
14599 o Minor bugfixes (Linux seccomp2 sandbox):
14600 - Make transparent proxy support work along with the seccomp2
14601 sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
14602 by Francisco Blas Izquierdo Riera.
14603 - Fix a memory leak in tor-resolve when running with the sandbox
14604 enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
14605 - Allow glibc fatal errors to be sent to stderr before Tor exits.
14606 Previously, glibc would try to write them to /dev/tty, and the
14607 sandbox would trap the call and make Tor exit prematurely. Fixes
14608 bug 14759; bugfix on 0.2.5.1-alpha.
14610 o Minor bugfixes (logging):
14611 - Avoid crashing when there are more log domains than entries in
14612 domain_list. Bugfix on 0.2.3.1-alpha.
14613 - Downgrade warnings about RSA signature failures to info log level.
14614 Emit a warning when an extra info document is found incompatible
14615 with a corresponding router descriptor. Fixes bug 9812; bugfix
14617 - Make connection_ap_handshake_attach_circuit() log the circuit ID
14618 correctly. Fixes bug 13701; bugfix on 0.0.6.
14620 o Minor bugfixes (networking):
14621 - Check for orconns and use connection_or_close_for_error() rather
14622 than connection_mark_for_close() directly in the getsockopt()
14623 failure case of connection_handle_write_impl(). Fixes bug 11302;
14624 bugfix on 0.2.4.4-alpha.
14626 o Minor bugfixes (parsing):
14627 - Stop accepting milliseconds (or other junk) at the end of
14628 descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
14629 - Support two-number and three-number version numbers correctly, in
14630 case we change the Tor versioning system in the future. Fixes bug
14631 13661; bugfix on 0.0.8pre1.
14633 o Minor bugfixes (portability):
14634 - Fix the ioctl()-based network interface lookup code so that it
14635 will work on systems that have variable-length struct ifreq, for
14637 - Use the correct datatype in the SipHash-2-4 function to prevent
14638 compilers from assuming any sort of alignment. Fixes bug 15436;
14639 bugfix on 0.2.5.3-alpha.
14641 o Minor bugfixes (preventative security, C safety):
14642 - When reading a hexadecimal, base-32, or base-64 encoded value from
14643 a string, always overwrite the whole output buffer. This prevents
14644 some bugs where we would look at (but fortunately, not reveal)
14645 uninitialized memory on the stack. Fixes bug 14013; bugfix on all
14647 - Clear all memory targeted by tor_addr_{to,from}_sockaddr(), not
14648 just the part that's used. This makes it harder for data leak bugs
14649 to occur in the event of other programming failures. Resolves
14652 o Minor bugfixes (relay):
14653 - When generating our family list, remove spaces from around the
14654 entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
14655 - If our previous bandwidth estimate was 0 bytes, allow publishing a
14656 new relay descriptor immediately. Fixes bug 13000; bugfix
14659 o Minor bugfixes (shutdown):
14660 - When shutting down, always call event_del() on lingering read or
14661 write events before freeing them. Otherwise, we risk double-frees
14662 or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
14665 o Minor bugfixes (small memory leaks):
14666 - Avoid leaking memory when using IPv6 virtual address mappings.
14667 Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
14670 o Minor bugfixes (statistics):
14671 - Increase period over which bandwidth observations are aggregated
14672 from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
14674 o Minor bugfixes (systemd support):
14675 - Run correctly under systemd with the RunAsDaemon option set. Fixes
14676 part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
14677 - Inform the systemd supervisor about more changes in the Tor
14678 process status. Implements part of ticket 14141. Patch from
14681 o Minor bugfixes (testing networks):
14682 - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
14683 testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
14684 - Stop using the default authorities in networks which provide both
14685 AlternateDirAuthority and AlternateBridgeAuthority. Partially
14686 fixes bug 13163; bugfix on 0.2.0.13-alpha.
14688 o Minor bugfixes (testing networks, fast startup):
14689 - Allow Tor to build circuits using a consensus with no exits. If
14690 the consensus has no exits (typical of a bootstrapping test
14691 network), allow Tor to build circuits once enough descriptors have
14692 been downloaded. This assists in bootstrapping a testing Tor
14693 network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
14695 - When V3AuthVotingInterval is low, give a lower If-Modified-Since
14696 header to directory servers. This allows us to obtain consensuses
14697 promptly when the consensus interval is very short. This assists
14698 in bootstrapping a testing Tor network. Fixes parts of bugs 13718
14699 and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
14700 - Stop assuming that private addresses are local when checking
14701 reachability in a TestingTorNetwork. Instead, when testing, assume
14702 all OR connections are remote. (This is necessary due to many test
14703 scenarios running all relays on localhost.) This assists in
14704 bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
14705 0.1.0.1-rc. Patch by "teor".
14706 - Avoid building exit circuits from a consensus with no exits. Now
14707 thanks to our fix for 13718, we accept a no-exit network as not
14708 wholly lost, but we need to remember not to try to build exit
14709 circuits on it. Closes ticket 13814; patch by "teor".
14710 - Stop requiring exits to have non-zero bandwithcapacity in a
14711 TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
14712 ignore exit bandwidthcapacity. This assists in bootstrapping a
14713 testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
14714 on 0.2.0.3-alpha. Patch by "teor".
14715 - Add "internal" to some bootstrap statuses when no exits are
14716 available. If the consensus does not contain Exits, Tor will only
14717 build internal circuits. In this case, relevant statuses will
14718 contain the word "internal" as indicated in the Tor control-
14719 spec.txt. When bootstrap completes, Tor will be ready to build
14720 internal circuits. If a future consensus contains Exits, exit
14721 circuits may become available. Fixes part of bug 13718; bugfix on
14722 0.2.4.10-alpha. Patch by "teor".
14723 - Decrease minimum consensus interval to 10 seconds when
14724 TestingTorNetwork is set, or 5 seconds for the first consensus.
14725 Fix assumptions throughout the code that assume larger intervals.
14726 Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
14728 - Avoid excluding guards from path building in minimal test
14729 networks, when we're in a test network and excluding guards would
14730 exclude all relays. This typically occurs in incredibly small tor
14731 networks, and those using "TestingAuthVoteGuard *". Fixes part of
14732 bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
14734 o Minor bugfixes (testing):
14735 - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
14736 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
14737 - Stop spawn test failures due to a race condition between the
14738 SIGCHLD handler updating the process status, and the test reading
14739 it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
14740 - Avoid passing an extra backslash when creating a temporary
14741 directory for running the unit tests on Windows. Fixes bug 12392;
14742 bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
14744 o Minor bugfixes (TLS):
14745 - Check more thoroughly throughout the TLS code for possible
14746 unlogged TLS errors. Possible diagnostic or fix for bug 13319.
14748 o Minor bugfixes (transparent proxy):
14749 - Use getsockname, not getsockopt, to retrieve the address for a
14750 TPROXY-redirected connection. Fixes bug 13796; bugfix
14753 o Minor bugfixes (windows):
14754 - Remove code to special-case handling of NTE_BAD_KEYSET when
14755 acquiring windows CryptoAPI context. This error can't actually
14756 occur for the parameters we're providing. Fixes bug 10816; bugfix
14759 o Minor bugfixes (zlib):
14760 - Avoid truncating a zlib stream when trying to finalize it with an
14761 empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
14763 o Code simplification and refactoring:
14764 - Change the entry_is_live() function to take named bitfield
14765 elements instead of an unnamed list of booleans. Closes
14767 - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
14768 Resolves ticket 12205.
14769 - Use calloc and reallocarray functions instead of multiply-
14770 then-malloc. This makes it less likely for us to fall victim to an
14771 integer overflow attack when allocating. Resolves ticket 12855.
14772 - Use the standard macro name SIZE_MAX, instead of our
14774 - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
14775 functions which take them as arguments. Replace 0 with NO_DIRINFO
14776 in a function call for clarity. Seeks to prevent future issues
14778 - Avoid 4 null pointer errors under clang static analysis by using
14779 tor_assert() to prove that the pointers aren't null. Fixes
14781 - Rework the API of policies_parse_exit_policy() to use a bitmask to
14782 represent parsing options, instead of a confusing mess of
14783 booleans. Resolves ticket 8197.
14784 - Introduce a helper function to parse ExitPolicy in
14785 or_options_t structure.
14786 - Move fields related to isolating and configuring client ports into
14787 a shared structure. Previously, they were duplicated across
14788 port_cfg_t, listener_connection_t, and edge_connection_t. Failure
14789 to copy them correctly had been the cause of at least one bug in
14790 the past. Closes ticket 8546.
14791 - Refactor the get_interface_addresses_raw() doom-function into
14792 multiple smaller and simpler subfunctions. Cover the resulting
14793 subfunctions with unit-tests. Fixes a significant portion of
14795 - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
14796 only for version <= 0.2.2.24 which is now deprecated. Closes
14798 - Remove a test for a long-defunct broken version-one
14800 - Refactor main loop to extract the 'loop' part. This makes it
14801 easier to run Tor under Shadow. Closes ticket 15176.
14802 - Stop using can_complete_circuits as a global variable; access it
14803 with a function instead.
14804 - Avoid using operators directly as macro arguments: this lets us
14805 apply coccinelle transformations to our codebase more directly.
14806 Closes ticket 13172.
14807 - Combine the functions used to parse ClientTransportPlugin and
14808 ServerTransportPlugin into a single function. Closes ticket 6456.
14809 - Add inline functions and convenience macros for inspecting channel
14810 state. Refactor the code to use convenience macros instead of
14811 checking channel state directly. Fixes issue 7356.
14812 - Document all members of was_router_added_t and rename
14813 ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
14814 confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
14815 - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
14816 constant instead of hardcoded value. Fixes issue 13840.
14817 - Refactor our generic strmap and digestmap types into a single
14818 implementation, so that we can add a new digest256map
14822 - Add a doc/TUNING document with tips for handling large numbers of
14823 TCP connections when running busy Tor relay. Update the warning
14824 message to point to this file when running out of sockets
14825 operating system is allowing to use simultaneously. Resolves
14827 - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
14828 for writing the OpenBSD-specific tips. Resolves ticket 13702.
14829 - Make the tor-resolve documentation match its help string and its
14830 options. Resolves part of ticket 14325.
14831 - Log a more useful error message from tor-resolve when failing to
14832 look up a hidden service address. Resolves part of ticket 14325.
14833 - Document the bridge-authority-only 'networkstatus-bridges' file.
14834 Closes ticket 13713; patch from "tom".
14835 - Fix typo in PredictedPortsRelevanceTime option description in
14836 manpage. Resolves issue 13707.
14837 - Stop suggesting that users specify relays by nickname: it isn't a
14838 good idea. Also, properly cross-reference how to specify relays in
14839 all parts of manual documenting options that take a list of
14840 relays. Closes ticket 13381.
14841 - Clarify the HiddenServiceDir option description in manpage to make
14842 it clear that relative paths are taken with respect to the current
14843 working directory. Also clarify that this behavior is not
14844 guaranteed to remain indefinitely. Fixes issue 13913.
14846 o Distribution (systemd):
14847 - systemd unit file: only allow tor to write to /var/lib/tor and
14848 /var/log/tor. The rest of the filesystem is accessible for reading
14849 only. Patch by intrigeri; resolves ticket 12751.
14850 - systemd unit file: ensure that the process and all its children
14851 can never gain new privileges. Patch by intrigeri; resolves
14853 - systemd unit file: set up /var/run/tor as writable for the Tor
14854 service. Patch by intrigeri; resolves ticket 13196.
14856 o Downgraded warnings:
14857 - Don't warn when we've attempted to contact a relay using the wrong
14858 ntor onion key. Closes ticket 9635.
14861 - Remove some lingering dead code that once supported mempools.
14862 Mempools were disabled by default in 0.2.5, and removed entirely
14863 in 0.2.6.3-alpha. Closes more of ticket 14848; patch
14866 o Removed features (directory authorities):
14867 - Remove code that prevented authorities from listing Tor relays
14868 affected by CVE-2011-2769 as guards. These relays are already
14869 rejected altogether due to the minimum version requirement of
14870 0.2.3.16-alpha. Closes ticket 13152.
14871 - The "AuthDirRejectUnlisted" option no longer has any effect, as
14872 the fingerprints file (approved-routers) has been deprecated.
14873 - Directory authorities do not support being Naming dirauths anymore.
14874 The "NamingAuthoritativeDir" config option is now obsolete.
14875 - Directory authorities do not support giving out the BadDirectory
14877 - Directory authorities no longer advertise or support consensus
14878 methods 1 through 12 inclusive. These consensus methods were
14879 obsolete and/or insecure: maintaining the ability to support them
14880 served no good purpose. Implements part of proposal 215; closes
14883 o Removed features:
14884 - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
14885 longer silently accepted as an alias for "ExitNodes".
14886 - The --enable-mempool and --enable-buf-freelists options, which
14887 were originally created to work around bad malloc implementations,
14888 no longer exist. They were off-by-default in 0.2.5. Closes
14890 - We no longer remind the user about configuration options that have
14891 been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
14892 - Remove our old, non-weighted bandwidth-based node selection code.
14893 Previously, we used it as a fallback when we couldn't perform
14894 weighted bandwidth-based node selection. But that would only
14895 happen in the cases where we had no consensus, or when we had a
14896 consensus generated by buggy or ancient directory authorities. In
14897 either case, it's better to use the more modern, better maintained
14898 algorithm, with reasonable defaults for the weights. Closes
14900 - Remove the --disable-curve25519 configure option. Relays and
14901 clients now are required to support curve25519 and the
14903 - The old "StrictEntryNodes" and "StrictExitNodes" options, which
14904 used to be deprecated synonyms for "StrictNodes", are now marked
14905 obsolete. Resolves ticket 12226.
14906 - Clients don't understand the BadDirectory flag in the consensus
14907 anymore, and ignore it.
14909 o Removed platform support:
14910 - We no longer include special code to build on Windows CE; as far
14911 as we know, nobody has used Tor on Windows CE in a very long time.
14912 Closes ticket 11446.
14914 o Testing (test-network.sh):
14915 - Stop using "echo -n", as some shells' built-in echo doesn't
14916 support "-n". Instead, use "/bin/echo -n". Partially fixes
14918 - Stop an apparent test-network hang when used with make -j2. Fixes
14920 - Add a --delay option to test-network.sh, which configures the
14921 delay before the chutney network tests for data transmission.
14922 Partially implements ticket 13161.
14925 - Test that tor does not fail when key files are zero-length. Check
14926 that tor generates new keys, and overwrites the empty key files.
14927 - Test that tor generates new keys when keys are missing
14928 (existing behavior).
14929 - Test that tor does not overwrite key files that already contain
14930 data (existing behavior). Tests bug 13111. Patch by "teor".
14931 - New "make test-stem" target to run stem integration tests.
14932 Requires that the "STEM_SOURCE_DIR" environment variable be set.
14933 Closes ticket 14107.
14934 - Make the test_cmdline_args.py script work correctly on Windows.
14935 Patch from Gisle Vanem.
14936 - Move the slower unit tests into a new "./src/test/test-slow"
14937 binary that can be run independently of the other tests. Closes
14939 - New tests for many parts of channel, relay, and circuitmux
14940 functionality. Code by Andrea; part of 9262.
14941 - New tests for parse_transport_line(). Part of ticket 6456.
14942 - In the unit tests, use chgrp() to change the group of the unit
14943 test temporary directory to the current user, so that the sticky
14944 bit doesn't interfere with tests that check directory groups.
14946 - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
14948 - Refactor the function that chooses guard nodes so that it can more
14949 easily be tested; write some tests for it.
14950 - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
14951 bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
14952 - Create unit tests for format_time_interval(). With bug 13393.
14953 - Add unit tests for tor_timegm signed overflow, tor_timegm and
14954 parse_rfc1123_time validity checks, correct_tm year clamping. Unit
14955 tests (visible) fixes in bug 13476.
14956 - Add a "coverage-html" make target to generate HTML-visualized
14957 coverage results when building with --enable-coverage. (Requires
14958 lcov.) Patch from Kevin Murray.
14959 - Enable the backtrace handler (where supported) when running the
14961 - Revise all unit tests that used the legacy test_* macros to
14962 instead use the recommended tt_* macros. This patch was generated
14963 with coccinelle, to avoid manual errors. Closes ticket 13119.
14965 Changes in version 0.2.5.11 - 2015-03-17
14966 Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
14968 It backports several bugfixes from the 0.2.6 branch, including a
14969 couple of medium-level security fixes for relays and exit nodes.
14970 It also updates the list of directory authorities.
14972 o Directory authority changes:
14973 - Remove turtles as a directory authority.
14974 - Add longclaw as a new (v3) directory authority. This implements
14975 ticket 13296. This keeps the directory authority count at 9.
14976 - The directory authority Faravahar has a new IP address. This
14977 closes ticket 14487.
14979 o Major bugfixes (crash, OSX, security):
14980 - Fix a remote denial-of-service opportunity caused by a bug in
14981 OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
14984 o Major bugfixes (relay, stability, possible security):
14985 - Fix a bug that could lead to a relay crashing with an assertion
14986 failure if a buffer of exactly the wrong layout was passed to
14987 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
14988 0.2.0.10-alpha. Patch from 'cypherpunks'.
14989 - Do not assert if the 'data' pointer on a buffer is advanced to the
14990 very end of the buffer; log a BUG message instead. Only assert if
14991 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
14993 o Major bugfixes (exit node stability):
14994 - Fix an assertion failure that could occur under high DNS load.
14995 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
14996 diagnosed and fixed by "cypherpunks".
14998 o Major bugfixes (Linux seccomp2 sandbox):
14999 - Upon receiving sighup with the seccomp2 sandbox enabled, do not
15000 crash during attempts to call wait4. Fixes bug 15088; bugfix on
15001 0.2.5.1-alpha. Patch from "sanic".
15003 o Minor features (controller):
15004 - New "GETINFO bw-event-cache" to get information about recent
15005 bandwidth events. Closes ticket 14128. Useful for controllers to
15006 get recent bandwidth history after the fix for ticket 13988.
15008 o Minor features (geoip):
15009 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
15010 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
15013 o Minor bugfixes (client, automapping):
15014 - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
15015 no value follows the option. Fixes bug 14142; bugfix on
15016 0.2.4.7-alpha. Patch by "teor".
15017 - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
15018 14195; bugfix on 0.1.0.1-rc.
15020 o Minor bugfixes (compilation):
15021 - Build without warnings with the stock OpenSSL srtp.h header, which
15022 has a duplicate declaration of SSL_get_selected_srtp_profile().
15023 Fixes bug 14220; this is OpenSSL's bug, not ours.
15025 o Minor bugfixes (directory authority):
15026 - Allow directory authorities to fetch more data from one another if
15027 they find themselves missing lots of votes. Previously, they had
15028 been bumping against the 10 MB queued data limit. Fixes bug 14261;
15029 bugfix on 0.1.2.5-alpha.
15030 - Enlarge the buffer to read bwauth generated files to avoid an
15031 issue when parsing the file in dirserv_read_measured_bandwidths().
15032 Fixes bug 14125; bugfix on 0.2.2.1-alpha.
15034 o Minor bugfixes (statistics):
15035 - Increase period over which bandwidth observations are aggregated
15036 from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
15038 o Minor bugfixes (preventative security, C safety):
15039 - When reading a hexadecimal, base-32, or base-64 encoded value from
15040 a string, always overwrite the whole output buffer. This prevents
15041 some bugs where we would look at (but fortunately, not reveal)
15042 uninitialized memory on the stack. Fixes bug 14013; bugfix on all
15046 Changes in version 0.2.4.26 - 2015-03-17
15047 Tor 0.2.4.26 includes an updated list of directory authorities. It
15048 also backports a couple of stability and security bugfixes from 0.2.5
15051 o Directory authority changes:
15052 - Remove turtles as a directory authority.
15053 - Add longclaw as a new (v3) directory authority. This implements
15054 ticket 13296. This keeps the directory authority count at 9.
15055 - The directory authority Faravahar has a new IP address. This
15056 closes ticket 14487.
15058 o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
15059 - Fix an assertion failure that could occur under high DNS load.
15060 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
15061 diagnosed and fixed by "cypherpunks".
15063 o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
15064 - Fix a bug that could lead to a relay crashing with an assertion
15065 failure if a buffer of exactly the wrong layout was passed to
15066 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
15067 0.2.0.10-alpha. Patch from 'cypherpunks'.
15068 - Do not assert if the 'data' pointer on a buffer is advanced to the
15069 very end of the buffer; log a BUG message instead. Only assert if
15070 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
15072 o Minor features (geoip):
15073 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
15074 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
15077 Changes in version 0.2.5.10 - 2014-10-24
15078 Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
15080 It adds several new security features, including improved
15081 denial-of-service resistance for relays, new compiler hardening
15082 options, and a system-call sandbox for hardened installations on Linux
15083 (requires seccomp2). The controller protocol has several new features,
15084 resolving IPv6 addresses should work better than before, and relays
15085 should be a little more CPU-efficient. We've added support for more
15086 OpenBSD and FreeBSD transparent proxy types. We've improved the build
15087 system and testing infrastructure to allow unit testing of more parts
15088 of the Tor codebase. Finally, we've addressed several nagging pluggable
15089 transport usability issues, and included numerous other small bugfixes
15090 and features mentioned below.
15092 This release marks end-of-life for Tor 0.2.3.x; those Tor versions
15093 have accumulated many known flaws; everyone should upgrade.
15095 o Major features (security):
15096 - The ntor handshake is now on-by-default, no matter what the
15097 directory authorities recommend. Implements ticket 8561.
15098 - Make the "tor-gencert" tool used by directory authority operators
15099 create 2048-bit signing keys by default (rather than 1024-bit, since
15100 1024-bit is uncomfortably small these days). Addresses ticket 10324.
15101 - Warn about attempts to run hidden services and relays in the same
15102 process: that's probably not a good idea. Closes ticket 12908.
15103 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
15104 today support TLS 1.0 or later, so we can safely turn off support
15105 for this old (and insecure) protocol. Fixes bug 13426.
15107 o Major features (relay security, DoS-resistance):
15108 - When deciding whether we have run out of memory and we need to
15109 close circuits, also consider memory allocated in buffers for
15110 streams attached to each circuit.
15112 This change, which extends an anti-DoS feature introduced in
15113 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
15114 better resist more memory-based DoS attacks than before. Since the
15115 MaxMemInCellQueues option now applies to all queues, it is renamed
15116 to MaxMemInQueues. This feature fixes bug 10169.
15117 - Avoid hash-flooding denial-of-service attacks by using the secure
15118 SipHash-2-4 hash function for our hashtables. Without this
15119 feature, an attacker could degrade performance of a targeted
15120 client or server by flooding their data structures with a large
15121 number of entries to be stored at the same hash table position,
15122 thereby slowing down the Tor instance. With this feature, hash
15123 table positions are derived from a randomized cryptographic key,
15124 and an attacker cannot predict which entries will collide. Closes
15126 - If you don't specify MaxMemInQueues yourself, Tor now tries to
15127 pick a good value based on your total system memory. Previously,
15128 the default was always 8 GB. You can still override the default by
15129 setting MaxMemInQueues yourself. Resolves ticket 11396.
15131 o Major features (bridges and pluggable transports):
15132 - Add support for passing arguments to managed pluggable transport
15133 proxies. Implements ticket 3594.
15134 - Bridges now track GeoIP information and the number of their users
15135 even when pluggable transports are in use, and report usage
15136 statistics in their extra-info descriptors. Resolves tickets 4773
15138 - Don't launch pluggable transport proxies if we don't have any
15139 bridges configured that would use them. Now we can list many
15140 pluggable transports, and Tor will dynamically start one when it
15141 hears a bridge address that needs it. Resolves ticket 5018.
15142 - The bridge directory authority now assigns status flags (Stable,
15143 Guard, etc) to bridges based on thresholds calculated over all
15144 Running bridges. Now bridgedb can finally make use of its features
15145 to e.g. include at least one Stable bridge in its answers. Fixes
15148 o Major features (controller):
15149 - Extend ORCONN controller event to include an "ID" parameter,
15150 and add four new controller event types CONN_BW, CIRC_BW,
15151 CELL_STATS, and TB_EMPTY that show connection and circuit usage.
15152 The new events are emitted in private Tor networks only, with the
15153 goal of being able to better track performance and load during
15154 full-network simulations. Implements proposal 218 and ticket 7359.
15156 o Major features (relay performance):
15157 - Speed up server-side lookups of rendezvous and introduction point
15158 circuits by using hashtables instead of linear searches. These
15159 functions previously accounted between 3 and 7% of CPU usage on
15160 some busy relays. Resolves ticket 9841.
15161 - Avoid wasting CPU when extending a circuit over a channel that is
15162 nearly out of circuit IDs. Previously, we would do a linear scan
15163 over possible circuit IDs before finding one or deciding that we
15164 had exhausted our possibilities. Now, we try at most 64 random
15165 circuit IDs before deciding that we probably won't succeed. Fixes
15166 a possible root cause of ticket 11553.
15168 o Major features (seccomp2 sandbox, Linux only):
15169 - Use the seccomp2 syscall filtering facility on Linux to limit
15170 which system calls Tor can invoke. This is an experimental,
15171 Linux-only feature to provide defense-in-depth against unknown
15172 attacks. To try turning it on, set "Sandbox 1" in your torrc
15173 file. Please be ready to report bugs. We hope to add support
15174 for better sandboxing in the future, including more fine-grained
15175 filters, better division of responsibility, and support for more
15176 platforms. This work has been done by Cristian-Matei Toader for
15177 Google Summer of Code. Resolves tickets 11351 and 11465.
15179 o Major features (testing networks):
15180 - Make testing Tor networks bootstrap better: lower directory fetch
15181 retry schedules and maximum interval without directory requests,
15182 and raise maximum download tries. Implements ticket 6752.
15183 - Add make target 'test-network' to run tests on a Chutney network.
15184 Implements ticket 8530.
15186 o Major features (other):
15187 - On some platforms (currently: recent OSX versions, glibc-based
15188 platforms that support the ELF format, and a few other
15189 Unix-like operating systems), Tor can now dump stack traces
15190 when a crash occurs or an assertion fails. By default, traces
15191 are dumped to stderr (if possible) and to any logs that are
15192 reporting errors. Implements ticket 9299.
15194 o Deprecated versions:
15195 - Tor 0.2.3.x has reached end-of-life; it has received no patches or
15196 attention for some while.
15198 o Major bugfixes (security, directory authorities):
15199 - Directory authorities now include a digest of each relay's
15200 identity key as a part of its microdescriptor.
15202 This is a workaround for bug 11743 (reported by "cypherpunks"),
15203 where Tor clients do not support receiving multiple
15204 microdescriptors with the same SHA256 digest in the same
15205 consensus. When clients receive a consensus like this, they only
15206 use one of the relays. Without this fix, a hostile relay could
15207 selectively disable some client use of target relays by
15208 constructing a router descriptor with a different identity and the
15209 same microdescriptor parameters and getting the authorities to
15210 list it in a microdescriptor consensus. This fix prevents an
15211 attacker from causing a microdescriptor collision, because the
15212 router's identity is not forgeable.
15214 o Major bugfixes (openssl bug workaround):
15215 - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
15216 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
15217 bug 13471. This is a workaround for an OpenSSL bug.
15219 o Major bugfixes (client):
15220 - Perform circuit cleanup operations even when circuit
15221 construction operations are disabled (because the network is
15222 disabled, or because there isn't enough directory information).
15223 Previously, when we were not building predictive circuits, we
15224 were not closing expired circuits either. Fixes bug 8387; bugfix on
15225 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
15226 became more strict about when we have "enough directory information
15227 to build circuits".
15229 o Major bugfixes (client, pluggable transports):
15230 - When managing pluggable transports, use OS notification facilities
15231 to learn if they have crashed, and don't attempt to kill any
15232 process that has already exited. Fixes bug 8746; bugfix
15235 o Major bugfixes (relay denial of service):
15236 - Instead of writing destroy cells directly to outgoing connection
15237 buffers, queue them and intersperse them with other outgoing cells.
15238 This can prevent a set of resource starvation conditions where too
15239 many pending destroy cells prevent data cells from actually getting
15240 delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
15241 bugfix on 0.2.0.1-alpha.
15243 o Major bugfixes (relay):
15244 - Avoid queuing or sending destroy cells for circuit ID zero when we
15245 fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
15246 Found and fixed by "cypherpunks".
15247 - Fix ORPort reachability detection on relays running behind a
15248 proxy, by correctly updating the "local" mark on the controlling
15249 channel when changing the address of an or_connection_t after the
15250 handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
15251 - Use a direct dirport connection when uploading non-anonymous
15252 descriptors to the directory authorities. Previously, relays would
15253 incorrectly use tunnel connections under a fairly wide variety of
15254 circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
15255 - When a circuit accidentally has the same circuit ID for its
15256 forward and reverse direction, correctly detect the direction of
15257 cells using that circuit. Previously, this bug made roughly one
15258 circuit in a million non-functional. Fixes bug 12195; this is a
15259 bugfix on every version of Tor.
15261 o Minor features (security):
15262 - New --enable-expensive-hardening option to enable security
15263 hardening options that consume nontrivial amounts of CPU and
15264 memory. Right now, this includes AddressSanitizer and UbSan, which
15265 are supported in newer versions of GCC and Clang. Closes ticket
15267 - Authorities now assign the Guard flag to the fastest 25% of the
15268 network (it used to be the fastest 50%). Also raise the consensus
15269 weight that guarantees the Guard flag from 250 to 2000. For the
15270 current network, this results in about 1100 guards, down from 2500.
15271 This step paves the way for moving the number of entry guards
15272 down to 1 (proposal 236) while still providing reasonable expected
15273 performance for most users. Implements ticket 12690.
15275 o Minor features (security, memory management):
15276 - Memory allocation tricks (mempools and buffer freelists) are now
15277 disabled by default. You can turn them back on with
15278 --enable-mempools and --enable-buf-freelists respectively. We're
15279 disabling these features because malloc performance is good enough
15280 on most platforms, and a similar feature in OpenSSL exacerbated
15281 exploitation of the Heartbleed attack. Resolves ticket 11476.
15283 o Minor features (bridge client):
15284 - Report a more useful failure message when we can't connect to a
15285 bridge because we don't have the right pluggable transport
15286 configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
15288 o Minor features (bridge):
15289 - Add an ExtORPortCookieAuthFileGroupReadable option to make the
15290 cookie file for the ExtORPort g+r by default.
15292 o Minor features (bridges, pluggable transports):
15293 - Bridges now write the SHA1 digest of their identity key
15294 fingerprint (that is, a hash of a hash of their public key) to
15295 notice-level logs, and to a new hashed-fingerprint file. This
15296 information will help bridge operators look up their bridge in
15297 Globe and similar tools. Resolves ticket 10884.
15298 - Improve the message that Tor displays when running as a bridge
15299 using pluggable transports without an Extended ORPort listener.
15300 Also, log the message in the log file too. Resolves ticket 11043.
15301 - Add threshold cutoffs to the networkstatus document created by
15302 the Bridge Authority. Fixes bug 1117.
15303 - On Windows, spawn background processes using the CREATE_NO_WINDOW
15304 flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
15305 doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
15306 Vidalia set this option for us.) Implements ticket 10297.
15308 o Minor features (build):
15309 - The configure script has a --disable-seccomp option to turn off
15310 support for libseccomp on systems that have it, in case it (or
15311 Tor's use of it) is broken. Resolves ticket 11628.
15312 - Assume that a user using ./configure --host wants to cross-compile,
15313 and give an error if we cannot find a properly named
15314 tool-chain. Add a --disable-tool-name-check option to proceed
15315 nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
15316 - If we run ./configure and the compiler recognizes -fstack-protector
15317 but the linker rejects it, warn the user about a potentially missing
15318 libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
15319 - Add support for `--library-versions` flag. Implements ticket 6384.
15320 - Return the "unexpected sendme" warnings to a warn severity, but make
15321 them rate limited, to help diagnose ticket 8093.
15322 - Detect a missing asciidoc, and warn the user about it, during
15323 configure rather than at build time. Fixes issue 6506. Patch from
15326 o Minor features (client):
15327 - Add a new option, PredictedPortsRelevanceTime, to control how long
15328 after having received a request to connect to a given port Tor
15329 will try to keep circuits ready in anticipation of future requests
15330 for that port. Patch from "unixninja92"; implements ticket 9176.
15332 o Minor features (config options and command line):
15333 - Add an --allow-missing-torrc commandline option that tells Tor to
15334 run even if the configuration file specified by -f is not available.
15335 Implements ticket 10060.
15336 - Add support for the TPROXY transparent proxying facility on Linux.
15337 See documentation for the new TransProxyType option for more
15338 details. Implementation by "thomo". Closes ticket 10582.
15340 o Minor features (config options):
15341 - Config (torrc) lines now handle fingerprints which are missing
15342 their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
15343 - Support a --dump-config option to print some or all of the
15344 configured options. Mainly useful for debugging the command-line
15345 option parsing code. Helps resolve ticket 4647.
15346 - Raise awareness of safer logging: notify user of potentially
15347 unsafe config options, like logging more verbosely than severity
15348 "notice" or setting SafeLogging to 0. Resolves ticket 5584.
15349 - Add a new configuration option TestingV3AuthVotingStartOffset
15350 that bootstraps a network faster by changing the timing for
15351 consensus votes. Addresses ticket 8532.
15352 - Add a new torrc option "ServerTransportOptions" that allows
15353 bridge operators to pass configuration parameters to their
15354 pluggable transports. Resolves ticket 8929.
15355 - The config (torrc) file now accepts bandwidth and space limits in
15356 bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
15357 you can now say "16 kilobits", and so on.) Resolves ticket 9214.
15360 o Minor features (controller):
15361 - Make the entire exit policy available from the control port via
15362 GETINFO exit-policy/*. Implements enhancement 7952. Patch from
15364 - Because of the fix for ticket 11396, the real limit for memory
15365 usage may no longer match the configured MaxMemInQueues value. The
15366 real limit is now exposed via GETINFO limits/max-mem-in-queues.
15367 - Add a new "HS_DESC" controller event that reports activities
15368 related to hidden service descriptors. Resolves ticket 8510.
15369 - New "DROPGUARDS" controller command to forget all current entry
15370 guards. Not recommended for ordinary use, since replacing guards
15371 too frequently makes several attacks easier. Resolves ticket 9934;
15373 - Implement the TRANSPORT_LAUNCHED control port event that
15374 notifies controllers about new launched pluggable
15375 transports. Resolves ticket 5609.
15377 o Minor features (diagnostic):
15378 - When logging a warning because of bug 7164, additionally check the
15379 hash table for consistency (as proposed on ticket 11737). This may
15380 help diagnose bug 7164.
15381 - When we log a heartbeat, log how many one-hop circuits we have
15382 that are at least 30 minutes old, and log status information about
15383 a few of them. This is an attempt to track down bug 8387.
15384 - When encountering an unexpected CR while writing text to a file on
15385 Windows, log the name of the file. Should help diagnosing
15387 - Give more specific warnings when a client notices that an onion
15388 handshake has failed. Fixes ticket 9635.
15389 - Add significant new logging code to attempt to diagnose bug 12184,
15390 where relays seem to run out of available circuit IDs.
15391 - Improve the diagnostic log message for bug 8387 even further to
15392 try to improve our odds of figuring out why one-hop directory
15393 circuits sometimes do not get closed.
15394 - Add more log messages to diagnose bug 7164, which causes
15395 intermittent "microdesc_free() called but md was still referenced"
15396 warnings. We now include more information, to figure out why we
15397 might be cleaning a microdescriptor for being too old if it's
15398 still referenced by a live node_t object.
15399 - Log current accounting state (bytes sent and received + remaining
15400 time for the current accounting period) in the relay's heartbeat
15401 message. Implements ticket 5526; patch from Peter Retzlaff.
15403 o Minor features (geoip):
15404 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
15407 o Minor features (interface):
15408 - Generate a warning if any ports are listed in the SocksPolicy,
15409 DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
15410 AuthDirBadExit options. (These options only support address
15411 ranges.) Fixes part of ticket 11108.
15413 o Minor features (kernel API usage):
15414 - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
15415 sockets in a single system call. Implements ticket 5129.
15417 o Minor features (log messages):
15418 - When ServerTransportPlugin is set on a bridge, Tor can write more
15419 useful statistics about bridge use in its extrainfo descriptors,
15420 but only if the Extended ORPort ("ExtORPort") is set too. Add a
15421 log message to inform the user in this case. Resolves ticket 9651.
15422 - When receiving a new controller connection, log the origin address.
15423 Resolves ticket 9698; patch from "sigpipe".
15424 - When logging OpenSSL engine status at startup, log the status of
15425 more engines. Fixes ticket 10043; patch from Joshua Datko.
15427 o Minor features (log verbosity):
15428 - Demote the message that we give when a flushing connection times
15429 out for too long from NOTICE to INFO. It was usually meaningless.
15430 Resolves ticket 5286.
15431 - Don't log so many notice-level bootstrapping messages at startup
15432 about downloading descriptors. Previously, we'd log a notice
15433 whenever we learned about more routers. Now, we only log a notice
15434 at every 5% of progress. Fixes bug 9963.
15435 - Warn less verbosely when receiving a malformed
15436 ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
15438 o Minor features (performance):
15439 - If we're using the pure-C 32-bit curve25519_donna implementation
15440 of curve25519, build it with the -fomit-frame-pointer option to
15441 make it go faster on register-starved hosts. This improves our
15442 handshake performance by about 6% on i386 hosts without nacl.
15443 Closes ticket 8109.
15445 o Minor features (relay):
15446 - If a circuit timed out for at least 3 minutes, check if we have a
15447 new external IP address, and publish a new descriptor with the new
15448 IP address if it changed. Resolves ticket 2454.
15450 o Minor features (testing):
15451 - If Python is installed, "make check" now runs extra tests beyond
15452 the unit test scripts.
15453 - When bootstrapping a test network, sometimes very few relays get
15454 the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
15455 specify a set of relays which should be voted Guard regardless of
15456 their uptime or bandwidth. Addresses ticket 9206.
15458 o Minor features (transparent proxy, *BSD):
15459 - Support FreeBSD's ipfw firewall interface for TransPort ports on
15460 FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
15461 10267; patch from "yurivict".
15462 - Support OpenBSD's divert-to rules with the pf firewall for
15463 transparent proxy ports. To enable it, set "TransProxyType
15464 pf-divert". This allows Tor to run a TransPort transparent proxy
15465 port on OpenBSD 4.4 or later without root privileges. See the
15466 pf.conf(5) manual page for information on configuring pf to use
15467 divert-to rules. Closes ticket 10896; patch from Dana Koch.
15469 o Minor bugfixes (bridge client):
15470 - Stop accepting bridge lines containing hostnames. Doing so would
15471 cause clients to perform DNS requests on the hostnames, which was
15472 not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
15474 o Minor bugfixes (bridges):
15475 - Avoid potential crashes or bad behavior when launching a
15476 server-side managed proxy with ORPort or ExtORPort temporarily
15477 disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
15478 - Fix a bug where the first connection works to a bridge that uses a
15479 pluggable transport with client-side parameters, but we don't send
15480 the client-side parameters on subsequent connections. (We don't
15481 use any pluggable transports with client-side parameters yet,
15482 but ScrambleSuit will soon become the first one.) Fixes bug 9162;
15483 bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
15485 o Minor bugfixes (build, auxiliary programs):
15486 - Stop preprocessing the "torify" script with autoconf, since
15487 it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
15489 - The tor-fw-helper program now follows the standard convention and
15490 exits with status code "0" on success. Fixes bug 9030; bugfix on
15491 0.2.3.1-alpha. Patch by Arlo Breault.
15492 - Corrected ./configure advice for what openssl dev package you should
15493 install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
15495 o Minor bugfixes (client):
15496 - Avoid "Tried to open a socket with DisableNetwork set" warnings
15497 when starting a client with bridges configured and DisableNetwork
15498 set. (Tor launcher starts Tor with DisableNetwork set the first
15499 time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
15500 - Improve the log message when we can't connect to a hidden service
15501 because all of the hidden service directory nodes hosting its
15502 descriptor are excluded. Improves on our fix for bug 10722, which
15503 was a bugfix on 0.2.0.10-alpha.
15504 - Raise a control port warning when we fail to connect to all of
15505 our bridges. Previously, we didn't inform the controller, and
15506 the bootstrap process would stall. Fixes bug 11069; bugfix on
15508 - Exit immediately when a process-owning controller exits.
15509 Previously, tor relays would wait for a little while after their
15510 controller exited, as if they had gotten an INT signal -- but this
15511 was problematic, since there was no feedback for the user. To do a
15512 clean shutdown, controllers should send an INT signal and give Tor
15513 a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
15514 - Stop attempting to connect to bridges before our pluggable
15515 transports are configured (harmless but resulted in some erroneous
15516 log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
15517 - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
15518 generating incorrect SOCKS5 responses, and confusing client
15519 applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
15521 o Minor bugfixes (client, DNSPort):
15522 - When using DNSPort, try to respond to AAAA requests with AAAA
15523 answers. Previously, we hadn't looked at the request type when
15524 deciding which answer type to prefer. Fixes bug 10468; bugfix on
15526 - When receiving a DNS query for an unsupported record type, reply
15527 with no answer rather than with a NOTIMPL error. This behavior
15528 isn't correct either, but it will break fewer client programs, we
15529 hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
15532 o Minor bugfixes (client, logging during bootstrap):
15533 - Only report the first fatal bootstrap error on a given OR
15534 connection. This stops us from telling the controller bogus error
15535 messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
15536 - Avoid generating spurious warnings when starting with
15537 DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
15540 o Minor bugfixes (closing OR connections):
15541 - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
15542 check if it's an or_connection_t and correctly call
15543 connection_or_close_for_error() rather than
15544 connection_mark_for_close() directly. Fixes bug 11304; bugfix on
15546 - When closing all connections on setting DisableNetwork to 1, use
15547 connection_or_close_normally() rather than closing OR connections
15548 out from under the channel layer. Fixes bug 11306; bugfix on
15551 o Minor bugfixes (code correctness):
15552 - Previously we used two temporary files when writing descriptors to
15553 disk; now we only use one. Fixes bug 1376.
15554 - Remove an erroneous (but impossible and thus harmless) pointer
15555 comparison that would have allowed compilers to skip a bounds
15556 check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
15557 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
15558 - Fix an always-true assertion in pluggable transports code so it
15559 actually checks what it was trying to check. Fixes bug 10046;
15560 bugfix on 0.2.3.9-alpha. Found by "dcb".
15562 o Minor bugfixes (command line):
15563 - Use a single command-line parser for parsing torrc options on the
15564 command line and for finding special command-line options to avoid
15565 inconsistent behavior for torrc option arguments that have the same
15566 names as command-line options. Fixes bugs 4647 and 9578; bugfix on
15568 - No longer allow 'tor --hash-password' with no arguments. Fixes bug
15569 9573; bugfix on 0.0.9pre5.
15571 o Minor bugfixes (compilation):
15572 - Compile correctly with builds and forks of OpenSSL (such as
15573 LibreSSL) that disable compression. Fixes bug 12602; bugfix on
15574 0.2.1.1-alpha. Patch from "dhill".
15575 - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
15576 turned off (that is, without support for v2 link handshakes). Fixes
15577 bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
15578 - In routerlist_assert_ok(), don't take the address of a
15579 routerinfo's cache_info member unless that routerinfo is non-NULL.
15580 Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
15581 - Fix a large number of false positive warnings from the clang
15582 analyzer static analysis tool. This should make real warnings
15583 easier for clang analyzer to find. Patch from "teor". Closes
15585 - Resolve GCC complaints on OpenBSD about discarding constness in
15586 TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
15587 on 0.1.1.23. Patch from Dana Koch.
15588 - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
15589 treatment of long and time_t as comparable types. Fixes part of
15590 bug 11633. Patch from Dana Koch.
15591 - When deciding whether to build the 64-bit curve25519
15592 implementation, detect platforms where we can compile 128-bit
15593 arithmetic but cannot link it. Fixes bug 11729; bugfix on
15594 0.2.4.8-alpha. Patch from "conradev".
15595 - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
15596 bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
15597 - Fix compilation with dmalloc. Fixes bug 11605; bugfix
15599 - Build and run correctly on systems like OpenBSD-current that have
15600 patched OpenSSL to remove get_cipher_by_char and/or its
15601 implementations. Fixes issue 13325.
15603 o Minor bugfixes (controller and command-line):
15604 - If changing a config option via "setconf" fails in a recoverable
15605 way, we used to nonetheless write our new control ports to the
15606 file described by the "ControlPortWriteToFile" option. Now we only
15607 write out that file if we successfully switch to the new config
15608 option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
15610 o Minor bugfixes (directory server):
15611 - No longer accept malformed http headers when parsing urls from
15612 headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
15613 bugfix on 0.0.6pre1.
15614 - When sending a compressed set of descriptors or microdescriptors,
15615 make sure to finalize the zlib stream. Previously, we would write
15616 all the compressed data, but if the last descriptor we wanted to
15617 send was missing or too old, we would not mark the stream as
15618 finished. This caused problems for decompression tools. Fixes bug
15619 11648; bugfix on 0.1.1.23.
15621 o Minor bugfixes (hidden service):
15622 - Only retry attempts to connect to a chosen rendezvous point 8
15623 times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
15625 o Minor bugfixes (interface):
15626 - Reject relative control socket paths and emit a warning. Previously,
15627 single-component control socket paths would be rejected, but Tor
15628 would not log why it could not validate the config. Fixes bug 9258;
15629 bugfix on 0.2.3.16-alpha.
15631 o Minor bugfixes (log messages):
15632 - Fix a bug where clients using bridges would report themselves
15633 as 50% bootstrapped even without a live consensus document.
15634 Fixes bug 9922; bugfix on 0.2.1.1-alpha.
15635 - Suppress a warning where, if there's only one directory authority
15636 in the network, we would complain that votes and signatures cannot
15637 be uploaded to other directory authorities. Fixes bug 10842;
15638 bugfix on 0.2.2.26-beta.
15639 - Report bootstrapping progress correctly when we're downloading
15640 microdescriptors. We had updated our "do we have enough microdescs
15641 to begin building circuits?" logic most recently in 0.2.4.10-alpha
15642 (see bug 5956), but we left the bootstrap status event logic at
15643 "how far through getting 1/4 of them are we?" Fixes bug 9958;
15644 bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
15646 o Minor bugfixes (logging):
15647 - Downgrade "Unexpected onionskin length after decryption" warning
15648 to a protocol-warn, since there's nothing relay operators can do
15649 about a client that sends them a malformed create cell. Resolves
15650 bug 12996; bugfix on 0.0.6rc1.
15651 - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
15652 cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
15653 - When logging information about an EXTEND2 or EXTENDED2 cell, log
15654 their names correctly. Fixes part of bug 12700; bugfix
15656 - When logging information about a relay cell whose command we don't
15657 recognize, log its command as an integer. Fixes part of bug 12700;
15658 bugfix on 0.2.1.10-alpha.
15659 - Escape all strings from the directory connection before logging
15660 them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
15661 - Squelch a spurious LD_BUG message "No origin circuit for
15662 successful SOCKS stream" in certain hidden service failure cases;
15664 - Downgrade the severity of the 'unexpected sendme cell from client'
15665 from 'warn' to 'protocol warning'. Closes ticket 8093.
15667 o Minor bugfixes (misc code correctness):
15668 - In munge_extrainfo_into_routerinfo(), check the return value of
15669 memchr(). This would have been a serious issue if we ever passed
15670 it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
15672 - On the chance that somebody manages to build Tor on a
15673 platform where time_t is unsigned, correct the way that
15674 microdesc_add_to_cache() handles negative time arguments.
15675 Fixes bug 8042; bugfix on 0.2.3.1-alpha.
15676 - Fix various instances of undefined behavior in channeltls.c,
15677 tor_memmem(), and eventdns.c that would cause us to construct
15678 pointers to memory outside an allocated object. (These invalid
15679 pointers were not accessed, but C does not even allow them to
15680 exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
15681 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
15682 - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
15683 fix some miscellaneous errors in our tests and codebase. Fixes bug
15684 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
15685 - Always check return values for unlink, munmap, UnmapViewOfFile;
15686 check strftime return values more often. In some cases all we can
15687 do is report a warning, but this may help prevent deeper bugs from
15688 going unnoticed. Closes ticket 8787; bugfixes on many, many tor
15690 - Fix numerous warnings from the clang "scan-build" static analyzer.
15691 Some of these are programming style issues; some of them are false
15692 positives that indicated awkward code; some are undefined behavior
15693 cases related to constructing (but not using) invalid pointers;
15694 some are assumptions about API behavior; some are (harmlessly)
15695 logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
15696 correct; and one or two are genuine bugs that weren't reachable
15697 from the rest of the program. Fixes bug 8793; bugfixes on many,
15700 o Minor bugfixes (node selection):
15701 - If ExcludeNodes is set, consider non-excluded hidden service
15702 directory servers before excluded ones. Do not consider excluded
15703 hidden service directory servers at all if StrictNodes is
15704 set. (Previously, we would sometimes decide to connect to those
15705 servers, and then realize before we initiated a connection that
15706 we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
15707 Reported by "mr-4".
15708 - If we set the ExitNodes option but it doesn't include any nodes
15709 that have the Exit flag, we would choose not to bootstrap. Now we
15710 bootstrap so long as ExitNodes includes nodes which can exit to
15711 some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
15713 o Minor bugfixes (performance):
15714 - Avoid a bug where every successful connection made us recompute
15715 the flag telling us whether we have sufficient information to
15716 build circuits. Previously, we would forget our cached value
15717 whenever we successfully opened a channel (or marked a router as
15718 running or not running for any other reason), regardless of
15719 whether we had previously believed the router to be running. This
15720 forced us to run an expensive update operation far too often.
15721 Fixes bug 12170; bugfix on 0.1.2.1-alpha.
15722 - Avoid using tor_memeq() for checking relay cell integrity. This
15723 removes a possible performance bottleneck. Fixes part of bug
15724 12169; bugfix on 0.2.1.31.
15726 o Minor bugfixes (platform-specific):
15727 - When dumping a malformed directory object to disk, save it in
15728 binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
15730 - Don't report failures from make_socket_reuseable() on incoming
15731 sockets on OSX: this can happen when incoming connections close
15732 early. Fixes bug 10081.
15734 o Minor bugfixes (pluggable transports):
15735 - Avoid another 60-second delay when starting Tor in a pluggable-
15736 transport-using configuration when we already have cached
15737 descriptors for our bridges. Fixes bug 11965; bugfix
15740 o Minor bugfixes (protocol correctness):
15741 - When receiving a VERSIONS cell with an odd number of bytes, close
15742 the connection immediately since the cell is malformed. Fixes bug
15743 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
15746 o Minor bugfixes (relay, other):
15747 - We now drop CREATE cells for already-existent circuit IDs and for
15748 zero-valued circuit IDs, regardless of other factors that might
15749 otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
15751 - When rejecting DATA cells for stream_id zero, still count them
15752 against the circuit's deliver window so that we don't fail to send
15753 a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
15755 o Minor bugfixes (relay, threading):
15756 - Check return code on spawn_func() in cpuworker code, so that we
15757 don't think we've spawned a nonworking cpuworker and write junk to
15758 it forever. Fix related to bug 4345; bugfix on all released Tor
15759 versions. Found by "skruffy".
15760 - Use a pthread_attr to make sure that spawn_func() cannot return an
15761 error while at the same time launching a thread. Fix related to
15762 bug 4345; bugfix on all released Tor versions. Reported
15765 o Minor bugfixes (relays and bridges):
15766 - Avoid crashing on a malformed resolv.conf file when running a
15767 relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
15768 - Non-exit relays no longer launch mock DNS requests to check for
15769 DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
15770 non-exit relays stopped servicing DNS requests. Fixes bug 965;
15771 bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
15772 - Bridges now report complete directory request statistics. Related
15773 to bug 5824; bugfix on 0.2.2.1-alpha.
15774 - Bridges now never collect statistics that were designed for
15775 relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
15777 o Minor bugfixes (testing):
15778 - Fix all valgrind warnings produced by the unit tests. There were
15779 over a thousand memory leak warnings previously, mostly produced
15780 by forgetting to free things in the unit test code. Fixes bug
15781 11618, bugfixes on many versions of Tor.
15783 o Minor bugfixes (tor-fw-helper):
15784 - Give a correct log message when tor-fw-helper fails to launch.
15785 (Previously, we would say something like "tor-fw-helper sent us a
15786 string we could not parse".) Fixes bug 9781; bugfix
15789 o Minor bugfixes (trivial memory leaks):
15790 - Fix a small memory leak when signing a directory object. Fixes bug
15791 11275; bugfix on 0.2.4.13-alpha.
15792 - Resolve some memory leaks found by coverity in the unit tests, on
15793 exit in tor-gencert, and on a failure to compute digests for our
15794 own keys when generating a v3 networkstatus vote. These leaks
15795 should never have affected anyone in practice.
15797 o Code simplification and refactoring:
15798 - Remove some old fallback code designed to keep Tor clients working
15799 in a network with only two working relays. Elsewhere in the code we
15800 have long since stopped supporting such networks, so there wasn't
15801 much point in keeping it around. Addresses ticket 9926.
15802 - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
15803 bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
15804 - Extract the common duplicated code for creating a subdirectory
15805 of the data directory and writing to a file in it. Fixes ticket
15806 4282; patch from Peter Retzlaff.
15807 - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
15808 buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
15809 i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
15810 - Add a set of accessor functions for the circuit timeout data
15811 structure. Fixes ticket 6153; patch from "piet".
15812 - Clean up exit paths from connection_listener_new(). Closes ticket
15813 8789. Patch from Arlo Breault.
15814 - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
15815 and drop our own custom pkey_eq() implementation. Fixes bug 9043.
15816 - Use a doubly-linked list to implement the global circuit list.
15817 Resolves ticket 9108. Patch from Marek Majkowski.
15818 - Remove contrib/id_to_fp.c since it wasn't used anywhere.
15819 - Remove constants and tests for PKCS1 padding; it's insecure and
15820 shouldn't be used for anything new. Fixes bug 8792; patch
15822 - Remove instances of strcpy() from the unit tests. They weren't
15823 hurting anything, since they were only in the unit tests, but it's
15824 embarrassing to have strcpy() in the code at all, and some analysis
15825 tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
15826 0.2.3.8-alpha. Patch from Arlo Breault.
15827 - Remove is_internal_IP() function. Resolves ticket 4645.
15828 - Remove unused function circuit_dump_by_chan from circuitlist.c.
15829 Closes issue 9107; patch from "marek".
15830 - Change our use of the ENUM_BF macro to avoid declarations that
15832 - Get rid of router->address, since in all cases it was just the
15833 string representation of router->addr. Resolves ticket 5528.
15836 - Adjust the URLs in the README to refer to the new locations of
15837 several documents on the website. Fixes bug 12830. Patch from
15839 - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
15841 - Update manpage to describe some of the files you can expect to
15842 find in Tor's DataDirectory. Addresses ticket 9839.
15843 - Clean up several option names in the manpage to match their real
15844 names, add the missing documentation for a couple of testing and
15845 directory authority options, remove the documentation for a
15846 V2-directory fetching option that no longer exists. Resolves
15848 - Correct the documentation so that it lists the correct directory
15849 for the stats files. (They are in a subdirectory called "stats",
15851 - In the manpage, move more authority-only options into the
15852 directory authority section so that operators of regular directory
15853 caches don't get confused.
15854 - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
15855 11061; bugfix on 0.2.4.7-alpha.
15856 - Resolve warnings from Doxygen.
15857 - Document in the manpage that "KBytes" may also be written as
15858 "kilobytes" or "KB", that "Kbits" may also be written as
15859 "kilobits", and so forth. Closes ticket 9222.
15860 - Document that the ClientOnly config option overrides ORPort.
15861 Our old explanation made ClientOnly sound as though it did
15862 nothing at all. Resolves bug 9059.
15863 - Explain that SocksPolicy, DirPolicy, and similar options don't
15864 take port arguments. Fixes the other part of ticket 11108.
15865 - Fix a comment about the rend_server_descriptor_t.protocols field
15866 to more accurately describe its range. Also, make that field
15867 unsigned, to more accurately reflect its usage. Fixes bug 9099;
15868 bugfix on 0.2.1.5-alpha.
15869 - Fix the manpage's description of HiddenServiceAuthorizeClient:
15870 the maximum client name length is 16, not 19. Fixes bug 11118;
15871 bugfix on 0.2.1.6-alpha.
15874 - The contrib directory has been sorted and tidied. Before, it was
15875 an unsorted dumping ground for useful and not-so-useful things.
15876 Now, it is divided based on functionality, and the items which
15877 seemed to be nonfunctional or useless have been removed. Resolves
15878 ticket 8966; based on patches from "rl1987".
15880 o Removed code and features:
15881 - Clients now reject any directory authority certificates lacking
15882 a dir-key-crosscert element. These have been included since
15883 0.2.1.9-alpha, so there's no real reason for them to be optional
15884 any longer. Completes proposal 157. Resolves ticket 10162.
15885 - Remove all code that existed to support the v2 directory system,
15886 since there are no longer any v2 directory authorities. Resolves
15888 - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
15889 options, which were used for designating authorities as "Hidden
15890 service authorities". There has been no use of hidden service
15891 authorities since 0.2.2.1-alpha, when we stopped uploading or
15892 downloading v0 hidden service descriptors. Fixes bug 10881; also
15893 part of a fix for bug 10841.
15894 - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
15895 and MTBF calculations, but that nobody was using. Fixes bug 11742.
15896 - The TunnelDirConns and PreferTunnelledDirConns options no longer
15897 exist; tunneled directory connections have been available since
15898 0.1.2.5-alpha, and turning them off is not a good idea. This is a
15899 brute-force fix for 10849, where "TunnelDirConns 0" would break
15901 - Remove all code for the long unused v1 directory protocol.
15902 Resolves ticket 11070.
15903 - Remove all remaining code related to version-0 hidden service
15904 descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
15905 the rest of bug 10841.
15906 - Remove migration code from when we renamed the "cached-routers"
15907 file to "cached-descriptors" back in 0.2.0.8-alpha. This
15908 incidentally resolves ticket 6502 by cleaning up the related code
15909 a bit. Patch from Akshay Hebbar.
15911 o Test infrastructure:
15912 - Tor now builds each source file in two modes: a mode that avoids
15913 exposing identifiers needlessly, and another mode that exposes
15914 more identifiers for testing. This lets the compiler do better at
15915 optimizing the production code, while enabling us to take more
15916 radical measures to let the unit tests test things.
15917 - The production builds no longer include functions used only in
15918 the unit tests; all functions exposed from a module only for
15919 unit-testing are now static in production builds.
15920 - Add an --enable-coverage configuration option to make the unit
15921 tests (and a new src/or/tor-cov target) to build with gcov test
15923 - Update to the latest version of tinytest.
15924 - Improve the tinytest implementation of string operation tests so
15925 that comparisons with NULL strings no longer crash the tests; they
15926 now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
15927 - New macros in test.h to simplify writing mock-functions for unit
15928 tests. Part of ticket 11507. Patch from Dana Koch.
15929 - We now have rudimentary function mocking support that our unit
15930 tests can use to test functions in isolation. Function mocking
15931 lets the tests temporarily replace a function's dependencies with
15932 stub functions, so that the tests can check the function without
15933 invoking the other functions it calls.
15936 - Complete tests for the status.c module. Resolves ticket 11507.
15937 Patch from Dana Koch.
15938 - Add more unit tests for the <circid,channel>->circuit map, and
15939 the destroy-cell-tracking code to fix bug 7912.
15940 - Unit tests for failing cases of the TAP onion handshake.
15941 - More unit tests for address-manipulation functions.
15943 o Distribution (systemd):
15944 - Include a tor.service file in contrib/dist for use with systemd.
15945 Some distributions will be able to use this file unmodified;
15946 others will need to tweak it, or write their own. Patch from Jamie
15947 Nguyen; resolves ticket 8368.
15948 - Verify configuration file via ExecStartPre in the systemd unit
15949 file. Patch from intrigeri; resolves ticket 12730.
15950 - Explicitly disable RunAsDaemon in the systemd unit file. Our
15951 current systemd unit uses "Type = simple", so systemd does not
15952 expect tor to fork. If the user has "RunAsDaemon 1" in their
15953 torrc, then things won't work as expected. This is e.g. the case
15954 on Debian (and derivatives), since there we pass "--defaults-torrc
15955 /usr/share/tor/tor-service-defaults-torrc" (that contains
15956 "RunAsDaemon 1") by default. Patch by intrigeri; resolves
15960 Changes in version 0.2.4.25 - 2014-10-20
15961 Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
15962 (even though POODLE does not affect Tor). It also works around a crash
15963 bug caused by some operating systems' response to the "POODLE" attack
15964 (which does affect Tor).
15966 o Major security fixes (also in 0.2.5.9-rc):
15967 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
15968 today support TLS 1.0 or later, so we can safely turn off support
15969 for this old (and insecure) protocol. Fixes bug 13426.
15971 o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
15972 - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
15973 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
15974 13471. This is a workaround for an OpenSSL bug.
15977 Changes in version 0.2.4.24 - 2014-09-22
15978 Tor 0.2.4.24 fixes a bug that affects consistency and speed when
15979 connecting to hidden services, and it updates the location of one of
15980 the directory authorities.
15983 - Clients now send the correct address for their chosen rendezvous
15984 point when trying to access a hidden service. They used to send
15985 the wrong address, which would still work some of the time because
15986 they also sent the identity digest of the rendezvous point, and if
15987 the hidden service happened to try connecting to the rendezvous
15988 point from a relay that already had a connection open to it,
15989 the relay would reuse that connection. Now connections to hidden
15990 services should be more robust and faster. Also, this bug meant
15991 that clients were leaking to the hidden service whether they were
15992 on a little-endian (common) or big-endian (rare) system, which for
15993 some users might have reduced their anonymity. Fixes bug 13151;
15994 bugfix on 0.2.1.5-alpha.
15996 o Directory authority changes:
15997 - Change IP address for gabelmoo (v3 directory authority).
15999 o Minor features (geoip):
16000 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
16004 Changes in version 0.2.4.23 - 2014-07-28
16005 Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
16006 guard rotation, and also backports several important fixes from the
16007 Tor 0.2.5 alpha release series.
16010 - Clients now look at the "usecreatefast" consensus parameter to
16011 decide whether to use CREATE_FAST or CREATE cells for the first hop
16012 of their circuit. This approach can improve security on connections
16013 where Tor's circuit handshake is stronger than the available TLS
16014 connection security levels, but the tradeoff is more computational
16015 load on guard relays. Implements proposal 221. Resolves ticket 9386.
16016 - Make the number of entry guards configurable via a new
16017 NumEntryGuards consensus parameter, and the number of directory
16018 guards configurable via a new NumDirectoryGuards consensus
16019 parameter. Implements ticket 12688.
16022 - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
16023 implementation that caused incorrect results on 32-bit
16024 implementations when certain malformed inputs were used along with
16025 a small class of private ntor keys. This bug does not currently
16026 appear to allow an attacker to learn private keys or impersonate a
16027 Tor server, but it could provide a means to distinguish 32-bit Tor
16028 implementations from 64-bit Tor implementations. Fixes bug 12694;
16029 bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
16033 - Warn and drop the circuit if we receive an inbound 'relay early'
16034 cell. Those used to be normal to receive on hidden service circuits
16035 due to bug 1038, but the buggy Tor versions are long gone from
16036 the network so we can afford to resume watching for them. Resolves
16037 the rest of bug 1038; bugfix on 0.2.1.19.
16038 - Correct a confusing error message when trying to extend a circuit
16039 via the control protocol but we don't know a descriptor or
16040 microdescriptor for one of the specified relays. Fixes bug 12718;
16041 bugfix on 0.2.3.1-alpha.
16042 - Avoid an illegal read from stack when initializing the TLS
16043 module using a version of OpenSSL without all of the ciphers
16044 used by the v2 link handshake. Fixes bug 12227; bugfix on
16045 0.2.4.8-alpha. Found by "starlight".
16048 - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
16052 Changes in version 0.2.4.22 - 2014-05-16
16053 Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
16054 alpha release series. These include blocking all authority signing
16055 keys that may have been affected by the OpenSSL "heartbleed" bug,
16056 choosing a far more secure set of TLS ciphersuites by default, closing
16057 a couple of memory leaks that could be used to run a target relay out
16058 of RAM, and several others.
16060 o Major features (security, backport from 0.2.5.4-alpha):
16061 - Block authority signing keys that were used on authorities
16062 vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
16063 don't have any evidence that these keys _were_ compromised; we're
16064 doing this to be prudent.) Resolves ticket 11464.
16066 o Major bugfixes (security, OOM):
16067 - Fix a memory leak that could occur if a microdescriptor parse
16068 fails during the tokenizing step. This bug could enable a memory
16069 exhaustion attack by directory servers. Fixes bug 11649; bugfix
16072 o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
16073 - The relay ciphersuite list is now generated automatically based on
16074 uniform criteria, and includes all OpenSSL ciphersuites with
16075 acceptable strength and forward secrecy. Previously, we had left
16076 some perfectly fine ciphersuites unsupported due to omission or
16077 typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
16078 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
16079 - Relays now trust themselves to have a better view than clients of
16080 which TLS ciphersuites are better than others. (Thanks to bug
16081 11513, the relay list is now well-considered, whereas the client
16082 list has been chosen mainly for anti-fingerprinting purposes.)
16083 Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
16084 CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
16085 AES128. Resolves ticket 11528.
16086 - Clients now try to advertise the same list of ciphersuites as
16087 Firefox 28. This change enables selection of (fast) GCM
16088 ciphersuites, disables some strange old ciphers, and stops
16089 advertising the ECDH (not to be confused with ECDHE) ciphersuites.
16090 Resolves ticket 11438.
16092 o Minor bugfixes (configuration, security):
16093 - When running a hidden service, do not allow TunneledDirConns 0:
16094 trying to set that option together with a hidden service would
16095 otherwise prevent the hidden service from running, and also make
16096 it publish its descriptors directly over HTTP. Fixes bug 10849;
16097 bugfix on 0.2.1.1-alpha.
16099 o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
16100 - Avoid sending a garbage value to the controller when a circuit is
16101 cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
16103 o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
16104 - Stop leaking memory when we successfully resolve a PTR record.
16105 Fixes bug 11437; bugfix on 0.2.4.7-alpha.
16107 o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
16108 - Avoid 60-second delays in the bootstrapping process when Tor is
16109 launching for a second time while using bridges. Fixes bug 9229;
16110 bugfix on 0.2.0.3-alpha.
16112 o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
16113 - Give the correct URL in the warning message when trying to run a
16114 relay on an ancient version of Windows. Fixes bug 9393.
16116 o Minor bugfixes (compilation):
16117 - Fix a compilation error when compiling with --disable-curve25519.
16118 Fixes bug 9700; bugfix on 0.2.4.17-rc.
16121 - Downgrade the warning severity for the the "md was still
16122 referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
16123 for trying to diagnose this bug, and the current warning in
16124 earlier versions of tor achieves nothing useful. Addresses warning
16127 o Minor features (log verbosity, backport from 0.2.5.4-alpha):
16128 - When we run out of usable circuit IDs on a channel, log only one
16129 warning for the whole channel, and describe how many circuits
16130 there were on the channel. Fixes part of ticket 11553.
16132 o Minor features (security, backport from 0.2.5.4-alpha):
16133 - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
16134 leave the default at 8GBytes), to better support Raspberry Pi
16135 users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
16137 o Documentation (backport from 0.2.5.4-alpha):
16138 - Correctly document that we search for a system torrc file before
16139 looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
16143 Changes in version 0.2.4.21 - 2014-02-28
16144 Tor 0.2.4.21 further improves security against potential adversaries who
16145 find breaking 1024-bit crypto doable, and backports several stability
16146 and robustness patches from the 0.2.5 branch.
16148 o Major features (client security):
16149 - When we choose a path for a 3-hop circuit, make sure it contains
16150 at least one relay that supports the NTor circuit extension
16151 handshake. Otherwise, there is a chance that we're building
16152 a circuit that's worth attacking by an adversary who finds
16153 breaking 1024-bit crypto doable, and that chance changes the game
16154 theory. Implements ticket 9777.
16157 - Do not treat streams that fail with reason
16158 END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
16159 since it could also indicate an ENETUNREACH connection error. Fixes
16160 part of bug 10777; bugfix on 0.2.4.8-alpha.
16162 o Code simplification and refactoring:
16163 - Remove data structures which were introduced to implement the
16164 CellStatistics option: they are now redundant with the new timestamp
16165 field in the regular packed_cell_t data structure, which we did
16166 in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
16169 - Always clear OpenSSL bignums before freeing them -- even bignums
16170 that don't contain secrets. Resolves ticket 10793. Patch by
16172 - Build without warnings under clang 3.4. (We have some macros that
16173 define static functions only some of which will get used later in
16174 the module. Starting with clang 3.4, these give a warning unless the
16175 unused attribute is set on them.) Resolves ticket 10904.
16176 - Update geoip and geoip6 files to the February 7 2014 Maxmind
16177 GeoLite2 Country database.
16180 - Set the listen() backlog limit to the largest actually supported
16181 on the system, not to the value in a header file. Fixes bug 9716;
16182 bugfix on every released Tor.
16183 - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
16184 exit node as a NOROUTE error, not an INTERNAL error, since they
16185 can apparently happen when trying to connect to the wrong sort
16186 of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
16187 - Fix build warnings about missing "a2x" comment when building the
16188 manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
16189 Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
16190 - Avoid a segfault on SIGUSR1, where we had freed a connection but did
16191 not entirely remove it from the connection lists. Fixes bug 9602;
16192 bugfix on 0.2.4.4-alpha.
16193 - Fix a segmentation fault in our benchmark code when running with
16194 Fedora's OpenSSL package, or any other OpenSSL that provides
16195 ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
16196 - Turn "circuit handshake stats since last time" log messages into a
16197 heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
16199 o Documentation fixes:
16200 - Document that all but one DirPort entry must have the NoAdvertise
16201 flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
16204 Changes in version 0.2.4.20 - 2013-12-22
16205 Tor 0.2.4.20 fixes potentially poor random number generation for users
16206 who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
16207 torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
16208 and 4) have no state file in their DataDirectory (as would happen on
16209 first start). Users who generated relay or hidden service identity
16210 keys in such a situation should discard them and generate new ones.
16212 This release also fixes a logic error that caused Tor clients to build
16213 many more preemptive circuits than they actually need.
16216 - Do not allow OpenSSL engines to replace the PRNG, even when
16217 HardwareAccel is set. The only default builtin PRNG engine uses
16218 the Intel RDRAND instruction to replace the entire PRNG, and
16219 ignores all attempts to seed it with more entropy. That's
16220 cryptographically stupid: the right response to a new alleged
16221 entropy source is never to discard all previously used entropy
16222 sources. Fixes bug 10402; works around behavior introduced in
16223 OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
16225 - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
16226 address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
16227 - Avoid launching spurious extra circuits when a stream is pending.
16228 This fixes a bug where any circuit that _wasn't_ unusable for new
16229 streams would be treated as if it were, causing extra circuits to
16230 be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
16233 - Avoid a crash bug when starting with a corrupted microdescriptor
16234 cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
16235 - If we fail to dump a previously cached microdescriptor to disk, avoid
16236 freeing duplicate data later on. Fixes bug 10423; bugfix on
16237 0.2.4.13-alpha. Spotted by "bobnomnom".
16240 Changes in version 0.2.4.19 - 2013-12-11
16241 The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
16242 (1986-2013). Aaron worked on diverse projects including helping to guide
16243 Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
16244 transparency to the U.S government's PACER documents, and contributing
16245 design and development for Tor and Tor2Web. Aaron was one of the latest
16246 martyrs in our collective fight for civil liberties and human rights,
16247 and his death is all the more painful because he was one of us.
16249 Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
16250 a new circuit handshake and link encryption that use ECC to provide
16251 better security and efficiency; makes relays better manage circuit
16252 creation requests; uses "directory guards" to reduce client enumeration
16253 risks; makes bridges collect and report statistics about the pluggable
16254 transports they support; cleans up and improves our geoip database;
16255 gets much closer to IPv6 support for clients, bridges, and relays; makes
16256 directory authorities use measured bandwidths rather than advertised
16257 ones when computing flags and thresholds; disables client-side DNS
16258 caching to reduce tracking risks; and fixes a big bug in bridge
16259 reachability testing. This release introduces two new design
16260 abstractions in the code: a new "channel" abstraction between circuits
16261 and or_connections to allow for implementing alternate relay-to-relay
16262 transports, and a new "circuitmux" abstraction storing the queue of
16263 circuits for a channel. The release also includes many stability,
16264 security, and privacy fixes.
16266 o Major features (new circuit handshake):
16267 - Tor now supports a new circuit extension handshake designed by Ian
16268 Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
16269 circuit extension handshake, later called "TAP", was a bit slow
16270 (especially on the relay side), had a fragile security proof, and
16271 used weaker keys than we'd now prefer. The new circuit handshake
16272 uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
16273 function, making it significantly more secure than the older
16274 handshake, and significantly faster. Tor can use one of two built-in
16275 pure-C curve25519-donna implementations by Adam Langley, or it
16276 can link against the "nacl" library for a tuned version if present.
16278 The built-in version is very fast for 64-bit systems when building
16279 with GCC. The built-in 32-bit version is still faster than the
16280 old TAP protocol, but using libnacl is better on most such hosts.
16282 Implements proposal 216; closes ticket 7202.
16284 o Major features (better link encryption):
16285 - Relays can now enable the ECDHE TLS ciphersuites when available
16286 and appropriate. These ciphersuites let us negotiate forward-secure
16287 TLS secret keys more safely and more efficiently than with our
16288 previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
16289 public relays prefer the (faster) P224 group, and bridges prefer
16290 the (more common) P256 group; you can override this with the
16293 This feature requires clients running 0.2.3.17-beta or later,
16294 and requires both sides to be running OpenSSL 1.0.0 or later
16295 with ECC support. OpenSSL 1.0.1, with the compile-time option
16296 "enable-ec_nistp_64_gcc_128", is highly recommended.
16298 Implements the relay side of proposal 198; closes ticket 7200.
16300 - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
16301 Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
16302 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
16303 renegotiation from working with TLS 1.1 or 1.2, so we had disabled
16304 them to solve bug 6033.)
16306 o Major features (relay performance):
16307 - Instead of limiting the number of queued onionskins (aka circuit
16308 create requests) to a fixed, hard-to-configure number, we limit
16309 the size of the queue based on how many we expect to be able to
16310 process in a given amount of time. We estimate the time it will
16311 take to process an onionskin based on average processing time
16312 of previous onionskins. Closes ticket 7291. You'll never have to
16313 configure MaxOnionsPending again.
16314 - Relays process the new "NTor" circuit-level handshake requests
16315 with higher priority than the old "TAP" circuit-level handshake
16316 requests. We still process some TAP requests to not totally starve
16317 0.2.3 clients when NTor becomes popular. A new consensus parameter
16318 "NumNTorsPerTAP" lets us tune the balance later if we need to.
16319 Implements ticket 9574.
16321 o Major features (client bootstrapping resilience):
16322 - Add a new "FallbackDir" torrc option to use when we can't use
16323 a directory mirror from the consensus (either because we lack a
16324 consensus, or because they're all down). Currently, all authorities
16325 are fallbacks by default, and there are no other default fallbacks,
16326 but that will change. This option will allow us to give clients a
16327 longer list of servers to try to get a consensus from when first
16328 connecting to the Tor network, and thereby reduce load on the
16329 directory authorities. Implements proposal 206, "Preconfigured
16330 directory sources for bootstrapping". We also removed the old
16331 "FallbackNetworkstatus" option, since we never got it working well
16332 enough to use it. Closes bug 572.
16333 - If we have no circuits open, use a relaxed timeout (the
16334 95th-percentile cutoff) until a circuit succeeds. This heuristic
16335 should allow Tor to succeed at building circuits even when the
16336 network connection drastically changes. Should help with bug 3443.
16338 o Major features (use of guards):
16339 - Support directory guards (proposal 207): when possible, clients now
16340 use their entry guards for non-anonymous directory requests. This
16341 can help prevent client enumeration. Note that this behavior only
16342 works when we have a usable consensus directory, and when options
16343 about what to download are more or less standard. In the future we
16344 should re-bootstrap from our guards, rather than re-bootstrapping
16345 from the preconfigured list of directory sources that ships with
16346 Tor. Resolves ticket 6526.
16347 - Raise the default time that a client keeps an entry guard from
16348 "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
16349 2012 paper. (We would make it even longer, but we need better client
16350 load balancing first.) Also, make the guard lifetime controllable
16351 via a new GuardLifetime torrc option and a GuardLifetime consensus
16352 parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
16354 o Major features (bridges with pluggable transports):
16355 - Bridges now report the pluggable transports they support to the
16356 bridge authority, so it can pass the supported transports on to
16357 bridgedb and/or eventually do reachability testing. Implements
16359 - Automatically forward the TCP ports of pluggable transport
16360 proxies using tor-fw-helper if PortForwarding is enabled. Implements
16363 o Major features (geoip database):
16364 - Maxmind began labelling Tor relays as being in country "A1",
16365 which breaks by-country node selection inside Tor. Now we use a
16366 script to replace "A1" ("Anonymous Proxy") entries in our geoip
16367 file with real country codes. This script fixes about 90% of "A1"
16368 entries automatically and uses manual country code assignments to
16369 fix the remaining 10%. See src/config/README.geoip for details.
16371 - Add GeoIP database for IPv6 addresses. The new config option
16373 - Update to the October 2 2013 Maxmind GeoLite Country database.
16375 o Major features (IPv6):
16376 - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
16377 IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
16378 to happen. Implements ticket 5535.
16379 - All kind of relays, not just bridges, can now advertise an IPv6
16380 OR port. Implements ticket 6362.
16381 - Relays can now exit to IPv6 addresses: make sure that you have IPv6
16382 connectivity, then set the IPv6Exit flag to 1. Also make sure your
16383 exit policy reads as you would like: the address * applies to all
16384 address families, whereas *4 is IPv4 address only, and *6 is IPv6
16385 addresses only. On the client side, you'll need to wait for enough
16386 exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
16387 and use Socks5. Closes ticket 5547, implements proposal 117 as
16388 revised in proposal 208.
16389 - Bridge authorities now accept IPv6 bridge addresses and include
16390 them in network status documents. Implements ticket 5534.
16391 - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
16393 o Major features (directory authorities):
16394 - Directory authorities now prefer using measured bandwidths to
16395 advertised ones when computing flags and thresholds. Resolves
16397 - Directory authorities that vote measured bandwidths about more
16398 than a threshold number of relays now treat relays with
16399 unmeasured bandwidths as having bandwidth 0 when computing their
16400 flags. Resolves ticket 8435.
16401 - Directory authorities now support a new consensus method (17)
16402 where they cap the published bandwidth of relays for which
16403 insufficient bandwidth measurements exist. Fixes part of bug 2286.
16404 - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
16405 serve any v2 directory information. Now we can test disabling the
16406 old deprecated v2 directory format, and see whether doing so has
16407 any effect on network load. Begins to fix bug 6783.
16409 o Major features (build and portability):
16410 - Switch to a nonrecursive Makefile structure. Now instead of each
16411 Makefile.am invoking other Makefile.am's, there is a master
16412 Makefile.am that includes the others. This change makes our build
16413 process slightly more maintainable, and improves parallelism for
16414 building with make -j. Original patch by Stewart Smith; various
16415 fixes by Jim Meyering.
16416 - Where available, we now use automake's "silent" make rules by
16417 default, so that warnings are easier to spot. You can get the old
16418 behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
16419 - Resume building correctly with MSVC and Makefile.nmake. This patch
16420 resolves numerous bugs and fixes reported by ultramage, including
16421 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
16423 o Security features:
16424 - Switch to a completely time-invariant approach for picking nodes
16425 weighted by bandwidth. Our old approach would run through the
16426 part of the loop after it had made its choice slightly slower
16427 than it ran through the part of the loop before it had made its
16428 choice. Addresses ticket 6538.
16429 - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
16430 by tor2web clients allows hidden services to identify tor2web
16431 clients through their repeated selection of the same rendezvous
16432 and introduction point circuit endpoints (their guards). Resolves
16435 o Major bugfixes (relay denial of service):
16436 - When we have too much memory queued in circuits (according to a new
16437 MaxMemInCellQueues option), close the circuits that have the oldest
16438 queued cells, on the theory that those are most responsible for
16439 us running low on memory. This prevents us from running out of
16440 memory as a relay if circuits fill up faster than they can be
16441 drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
16442 Tor. This bug is a further fix beyond bug 6252, whose fix was
16443 merged into 0.2.3.21-rc.
16444 - Reject bogus create and relay cells with 0 circuit ID or 0 stream
16445 ID: these could be used to create unexpected streams and circuits
16446 which would count as "present" to some parts of Tor but "absent"
16447 to others, leading to zombie circuits and streams or to a bandwidth
16448 denial-of-service. Fixes bug 7889; bugfix on every released version
16449 of Tor. Reported by "oftc_must_be_destroyed".
16450 - Avoid a bug where our response to TLS renegotiation under certain
16451 network conditions could lead to a busy-loop, with 100% CPU
16452 consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
16454 o Major bugfixes (asserts, crashes, leaks):
16455 - Prevent the get_freelists() function from running off the end of
16456 the list of freelists if it somehow gets an unrecognized
16457 allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
16459 - Avoid a memory leak where we would leak a consensus body when we
16460 find that a consensus which we couldn't previously verify due to
16461 missing certificates is now verifiable. Fixes bug 8719; bugfix
16463 - If we are unable to save a microdescriptor to the journal, do not
16464 drop it from memory and then reattempt downloading it. Fixes bug
16465 9645; bugfix on 0.2.2.6-alpha.
16466 - Fix an assertion failure that would occur when disabling the
16467 ORPort setting on a running Tor process while accounting was
16468 enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
16469 - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
16470 when an exit connection with optimistic data succeeds immediately
16471 rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
16473 - Fix a memory leak that would occur whenever a configuration
16474 option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
16476 o Major bugfixes (relay rate limiting):
16477 - When a TLS write is partially successful but incomplete, remember
16478 that the flushed part has been flushed, and notice that bytes were
16479 actually written. Reported and fixed pseudonymously. Fixes bug 7708;
16480 bugfix on Tor 0.1.0.5-rc.
16481 - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
16482 to 1GB/1GB. The previous defaults were intended to be "basically
16483 infinite", but it turns out they're now limiting our 100mbit+
16484 relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
16485 last time we raised it).
16486 - No longer stop reading or writing on cpuworker connections when
16487 our rate limiting buckets go empty. Now we should handle circuit
16488 handshake requests more promptly. Resolves bug 9731.
16490 o Major bugfixes (client-side privacy):
16491 - When we mark a circuit as unusable for new circuits, have it
16492 continue to be unusable for new circuits even if MaxCircuitDirtiness
16493 is increased too much at the wrong time, or the system clock jumps
16494 backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
16495 - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
16496 which have resolved to internal addresses") is set, apply that
16497 rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
16498 - When an exit relay rejects a stream with reason "exit policy", but
16499 we only know an exit policy summary (e.g. from the microdesc
16500 consensus) for it, do not mark the relay as useless for all exiting.
16501 Instead, mark just the circuit as unsuitable for that particular
16502 address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
16504 o Major bugfixes (stream isolation):
16505 - Allow applications to get proper stream isolation with
16506 IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
16507 username/password authentication also offer "no authentication". Tor
16508 had previously preferred "no authentication", so the applications
16509 never actually sent Tor their auth details. Now Tor selects
16510 username/password authentication if it's offered. You can disable
16511 this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
16512 bug 8117; bugfix on 0.2.3.3-alpha.
16513 - Follow the socks5 protocol when offering username/password
16514 authentication. The fix for bug 8117 exposed this bug, and it
16515 turns out real-world applications like Pidgin do care. Bugfix on
16516 0.2.3.2-alpha; fixes bug 8879.
16518 o Major bugfixes (client circuit building):
16519 - Alter circuit build timeout measurement to start at the point
16520 where we begin the CREATE/CREATE_FAST step (as opposed to circuit
16521 initialization). This should make our timeout measurements more
16522 uniform. Previously, we were sometimes including ORconn setup time
16523 in our circuit build time measurements. Should resolve bug 3443.
16524 - If the circuit build timeout logic is disabled (via the consensus,
16525 or because we are an authority), then don't build testing circuits.
16526 Fixes bug 9657; bugfix on 0.2.2.14-alpha.
16528 o Major bugfixes (client-side DNS):
16529 - Turn off the client-side DNS cache by default. Updating and using
16530 the DNS cache is now configurable on a per-client-port
16531 level. SOCKSPort, DNSPort, etc lines may now contain
16532 {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
16533 cache these types of DNS answers when we receive them from an
16534 exit node in response to an application request on this port, and
16535 {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
16536 cached DNS answers of these types, we shouldn't use them. It's
16537 potentially risky to use cached DNS answers at the client, since
16538 doing so can indicate to one exit what answers we've gotten
16539 for DNS lookups in the past. With IPv6, this becomes especially
16540 problematic. Using cached DNS answers for requests on the same
16541 circuit would present less linkability risk, since all traffic
16542 on a circuit is already linkable, but it would also provide
16543 little performance benefit: the exit node caches DNS replies
16544 too. Implements a simplified version of Proposal 205. Implements
16547 o Major bugfixes (hidden service privacy):
16548 - Limit hidden service descriptors to at most ten introduction
16549 points, to slow one kind of guard enumeration. Fixes bug 9002;
16550 bugfix on 0.1.1.11-alpha.
16552 o Major bugfixes (directory fetching):
16553 - If the time to download the next old-style networkstatus is in
16554 the future, do not decline to consider whether to download the
16555 next microdescriptor networkstatus. Fixes bug 9564; bugfix on
16557 - We used to always request authority certificates by identity digest,
16558 meaning we'd get the newest one even when we wanted one with a
16559 different signing key. Then we would complain about being given
16560 a certificate we already had, and never get the one we really
16561 wanted. Now we use the "fp-sk/" resource as well as the "fp/"
16562 resource to request the one we want. Fixes bug 5595; bugfix on
16565 o Major bugfixes (bridge reachability):
16566 - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
16567 previously they did not, which prevented them from receiving
16568 successful connections from relays for self-test or bandwidth
16569 testing. Also, when a relay is extending a circuit to a bridge,
16570 it needs to send a NETINFO cell, even when the bridge hasn't sent
16571 an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
16573 o Major bugfixes (control interface):
16574 - When receiving a new configuration file via the control port's
16575 LOADCONF command, do not treat the defaults file as absent.
16576 Fixes bug 9122; bugfix on 0.2.3.9-alpha.
16578 o Major bugfixes (directory authorities):
16579 - Stop marking every relay as having been down for one hour every
16580 time we restart a directory authority. These artificial downtimes
16581 were messing with our Stable and Guard flag calculations. Fixes
16582 bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
16583 - When computing directory thresholds, ignore any rejected-as-sybil
16584 nodes during the computation so that they can't influence Fast,
16585 Guard, etc. (We should have done this for proposal 109.) Fixes
16587 - When marking a node as a likely sybil, reset its uptime metrics
16588 to zero, so that it cannot time towards getting marked as Guard,
16589 Stable, or HSDir. (We should have done this for proposal 109.) Fixes
16591 - Fix a bug in the voting algorithm that could yield incorrect results
16592 when a non-naming authority declared too many flags. Fixes bug 9200;
16593 bugfix on 0.2.0.3-alpha.
16595 o Internal abstraction features:
16596 - Introduce new channel_t abstraction between circuits and
16597 or_connection_t to allow for implementing alternate OR-to-OR
16598 transports. A channel_t is an abstract object which can either be a
16599 cell-bearing channel, which is responsible for authenticating and
16600 handshaking with the remote OR and transmitting cells to and from
16601 it, or a listening channel, which spawns new cell-bearing channels
16602 at the request of remote ORs. Implements part of ticket 6465.
16603 - Make a channel_tls_t subclass of channel_t, adapting it to the
16604 existing or_connection_t code. The V2/V3 protocol handshaking
16605 code which formerly resided in command.c has been moved below the
16606 channel_t abstraction layer and may be found in channeltls.c now.
16607 Implements the rest of ticket 6465.
16608 - Introduce new circuitmux_t storing the queue of circuits for
16609 a channel; this encapsulates and abstracts the queue logic and
16610 circuit selection policy, and allows the latter to be overridden
16611 easily by switching out a policy object. The existing EWMA behavior
16612 is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
16614 o New build requirements:
16615 - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
16616 strongly recommended.
16617 - Tor maintainers now require Automake version 1.9 or later to build
16618 Tor from the Git repository. (Automake is not required when building
16619 from a source distribution.)
16621 o Minor features (protocol):
16622 - No longer include the "opt" prefix when generating routerinfos
16623 or v2 directories: it has been needless since Tor 0.1.2. Closes
16625 - Reject EXTEND cells sent to nonexistent streams. According to the
16626 spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
16627 we were only checking for stream IDs that were currently in use.
16628 Found while hunting for more instances of bug 6271. Bugfix on
16629 0.0.2pre8, which introduced incremental circuit construction.
16630 - Tor relays and clients now support a better CREATE/EXTEND cell
16631 format, allowing the sender to specify multiple address, identity,
16632 and handshake types. Implements Robert Ransom's proposal 200;
16633 closes ticket 7199.
16634 - Reject as invalid most directory objects containing a NUL.
16635 Belt-and-suspender fix for bug 8037.
16637 o Minor features (security):
16638 - Clear keys and key-derived material left on the stack in
16639 rendservice.c and rendclient.c. Check return value of
16640 crypto_pk_write_private_key_to_string() in rend_service_load_keys().
16641 These fixes should make us more forward-secure against cold-boot
16642 attacks and the like. Fixes bug 2385.
16643 - Use our own weak RNG when we need a weak RNG. Windows's rand() and
16644 Irix's random() only return 15 bits; Solaris's random() returns more
16645 bits but its RAND_MAX says it only returns 15, and so on. Motivated
16646 by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
16648 o Minor features (control protocol):
16649 - Add a "GETINFO signal/names" control port command. Implements
16651 - Provide default values for all options via "GETINFO config/defaults".
16652 Implements ticket 4971.
16653 - Allow an optional $ before the node identity digest in the
16654 controller command GETINFO ns/id/<identity>, for consistency with
16655 md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
16656 - Add CACHED keyword to ADDRMAP events in the control protocol
16657 to indicate whether a DNS result will be cached or not. Resolves
16659 - Generate bootstrapping status update events correctly when fetching
16660 microdescriptors. Fixes bug 9927.
16662 o Minor features (path selection):
16663 - When deciding whether we have enough descriptors to build circuits,
16664 instead of looking at raw relay counts, look at which fraction
16665 of (bandwidth-weighted) paths we're able to build. This approach
16666 keeps clients from building circuits if their paths are likely to
16667 stand out statistically. The default fraction of paths needed is
16668 taken from the consensus directory; you can override it with the
16669 new PathsNeededToBuildCircuits option. Fixes ticket 5956.
16670 - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
16671 and we have GeoIP information, also exclude all nodes with unknown
16672 countries "??" and "A1". This behavior is controlled by the
16673 new GeoIPExcludeUnknown option: you can make such nodes always
16674 excluded with "GeoIPExcludeUnknown 1", and disable the feature
16675 with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
16676 gets you the default behavior. Implements feature 7706.
16678 o Minor features (hidden services):
16679 - Improve circuit build timeout handling for hidden services.
16680 In particular: adjust build timeouts more accurately depending
16681 upon the number of hop-RTTs that a particular circuit type
16682 undergoes. Additionally, launch intro circuits in parallel
16683 if they timeout, and take the first one to reply as valid.
16684 - The Tor client now ignores sub-domain components of a .onion
16685 address. This change makes HTTP "virtual" hosting
16686 possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
16687 http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
16688 hosted on the same hidden service. Implements proposal 204.
16689 - Enable Tor to read configuration, state, and key information from
16690 a FIFO. Previously Tor would only read from files with a positive
16691 stat.st_size. Code from meejah; fixes bug 6044.
16693 o Minor features (clients):
16694 - Teach bridge-using clients to avoid 0.2.2.x bridges when making
16695 microdescriptor-related dir requests, and only fall back to normal
16696 descriptors if none of their bridges can handle microdescriptors
16697 (as opposed to the fix in ticket 4013, which caused them to fall
16698 back to normal descriptors if *any* of their bridges preferred
16699 them). Resolves ticket 4994.
16700 - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
16701 TCP ports to forward. In the past it only accepted two ports:
16702 the ORPort and the DirPort.
16704 o Minor features (protecting client timestamps):
16705 - Clients no longer send timestamps in their NETINFO cells. These were
16706 not used for anything, and they provided one small way for clients
16707 to be distinguished from each other as they moved from network to
16708 network or behind NAT. Implements part of proposal 222.
16709 - Clients now round timestamps in INTRODUCE cells down to the nearest
16710 10 minutes. If a new Support022HiddenServices option is set to 0, or
16711 if it's set to "auto" and the feature is disabled in the consensus,
16712 the timestamp is sent as 0 instead. Implements part of proposal 222.
16713 - Stop sending timestamps in AUTHENTICATE cells. This is not such
16714 a big deal from a security point of view, but it achieves no actual
16715 good purpose, and isn't needed. Implements part of proposal 222.
16716 - Reduce down accuracy of timestamps in hidden service descriptors.
16717 Implements part of proposal 222.
16719 o Minor features (bridges):
16720 - Make bridge relays check once a minute for whether their IP
16721 address has changed, rather than only every 15 minutes. Resolves
16722 bugs 1913 and 1992.
16723 - Bridge statistics now count bridge clients connecting over IPv6:
16724 bridge statistics files now list "bridge-ip-versions" and
16725 extra-info documents list "geoip6-db-digest". The control protocol
16726 "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
16727 implementation by "shkoo", addressing ticket 5055.
16728 - Add a new torrc option "ServerTransportListenAddr" to let bridge
16729 operators select the address where their pluggable transports will
16730 listen for connections. Resolves ticket 7013.
16731 - Randomize the lifetime of our SSL link certificate, so censors can't
16732 use the static value for filtering Tor flows. Resolves ticket 8443;
16733 related to ticket 4014 which was included in 0.2.2.33.
16735 o Minor features (relays):
16736 - Option OutboundBindAddress can be specified multiple times and
16737 accepts IPv6 addresses. Resolves ticket 6876.
16739 o Minor features (IPv6, client side):
16740 - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
16741 prefer to hand out virtual IPv6 addresses, since there are more of
16742 them and we can't run out. To override this behavior and make IPv4
16743 addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
16744 or DNSPort you're using for resolving. Implements ticket 7571.
16745 - AutomapHostsOnResolve responses are now randomized, to avoid
16746 annoying situations where Tor is restarted and applications
16747 connect to the wrong addresses.
16748 - Never try more than 1000 times to pick a new virtual address when
16749 AutomapHostsOnResolve is set. That's good enough so long as we
16750 aren't close to handing out our entire virtual address space;
16751 if you're getting there, it's best to switch to IPv6 virtual
16754 o Minor features (IPv6, relay/authority side):
16755 - New config option "AuthDirHasIPv6Connectivity 1" that directory
16756 authorities should set if they have IPv6 connectivity and want to
16757 do reachability tests for IPv6 relays. Implements feature 5974.
16758 - A relay with an IPv6 OR port now sends that address in NETINFO
16759 cells (in addition to its other address). Implements ticket 6364.
16761 o Minor features (directory authorities):
16762 - Directory authorities no long accept descriptors for any version of
16763 Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
16764 These versions are insecure, unsupported, or both. Implements
16766 - When directory authorities are computing thresholds for flags,
16767 never let the threshold for the Fast flag fall below 4096
16768 bytes. Also, do not consider nodes with extremely low bandwidths
16769 when deciding thresholds for various directory flags. This change
16770 should raise our threshold for Fast relays, possibly in turn
16771 improving overall network performance; see ticket 1854. Resolves
16773 - Directory authorities now include inside each vote a statement of
16774 the performance thresholds they used when assigning flags.
16775 Implements ticket 8151.
16776 - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
16777 in directory authority votes to describe whether they have enough
16778 measured bandwidths to ignore advertised (relay descriptor)
16779 bandwidth claims. Resolves ticket 8711.
16781 o Minor features (path bias detection):
16782 - Path Use Bias: Perform separate accounting for successful circuit
16783 use. Keep separate statistics on stream attempt rates versus stream
16784 success rates for each guard. Provide configurable thresholds to
16785 determine when to emit log messages or disable use of guards that
16786 fail too many stream attempts. Resolves ticket 7802.
16787 - Create three levels of Path Bias log messages, as opposed to just
16788 two. These are configurable via consensus as well as via the torrc
16789 options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
16790 The default values are 0.70, 0.50, and 0.30 respectively.
16791 - Separate the log message levels from the decision to drop guards,
16792 which also is available via torrc option PathBiasDropGuards.
16793 PathBiasDropGuards still defaults to 0 (off).
16794 - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
16795 in combination with PathBiasExtremeRate.
16796 - Increase the default values for PathBiasScaleThreshold and
16797 PathBiasCircThreshold from (200, 20) to (300, 150).
16798 - Add in circuit usage accounting to path bias. If we try to use a
16799 built circuit but fail for any reason, it counts as path bias.
16800 Certain classes of circuits where the adversary gets to pick your
16801 destination node are exempt from this accounting. Usage accounting
16802 can be specifically disabled via consensus parameter or torrc.
16803 - Convert all internal path bias state to double-precision floating
16804 point, to avoid roundoff error and other issues.
16805 - Only record path bias information for circuits that have completed
16806 *two* hops. Assuming end-to-end tagging is the attack vector, this
16807 makes us more resilient to ambient circuit failure without any
16808 detection capability loss.
16810 o Minor features (build):
16811 - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
16812 dhill. Resolves ticket 6982.
16813 - Compile on win64 using mingw64. Fixes bug 7260; patches from
16815 - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
16816 separate error codes; or at least, don't break for that reason.
16817 Fixes bug 7935. Reported by "oftc_must_be_destroyed".
16819 o Build improvements (autotools):
16820 - Warn if building on a platform with an unsigned time_t: there
16821 are too many places where Tor currently assumes that time_t can
16822 hold negative values. We'd like to fix them all, but probably
16824 - Do not report status verbosely from autogen.sh unless the -v flag
16825 is specified. Fixes issue 4664. Patch from Onizuka.
16826 - Detect and reject attempts to build Tor with threading support
16827 when OpenSSL has been compiled without threading support.
16829 - Try to detect if we are ever building on a platform where
16830 memset(...,0,...) does not set the value of a double to 0.0. Such
16831 platforms are permitted by the C standard, though in practice
16832 they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
16833 currently support them, but it's better to detect them and fail
16834 than to perform erroneously.
16835 - We no longer warn so much when generating manpages from their
16837 - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
16838 the signs of types during autoconf. This is better than our old
16839 approach, which didn't work when cross-compiling.
16841 o Minor features (log messages, warnings):
16842 - Detect when we're running with a version of OpenSSL other than the
16843 one we compiled with. This conflict has occasionally given people
16844 hard-to-track-down errors.
16845 - Warn users who run hidden services on a Tor client with
16846 UseEntryGuards disabled that their hidden services will be
16847 vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
16848 attack which motivated Tor to support entry guards in the first
16849 place). Resolves ticket 6889.
16850 - Warn when we are binding low ports when hibernation is enabled;
16851 previously we had warned when we were _advertising_ low ports with
16852 hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
16853 - Issue a warning when running with the bufferevents backend enabled.
16854 It's still not stable, and people should know that they're likely
16855 to hit unexpected problems. Closes ticket 9147.
16857 o Minor features (log messages, notices):
16858 - Refactor resolve_my_address() so it returns the method by which we
16859 decided our public IP address (explicitly configured, resolved from
16860 explicit hostname, guessed from interfaces, learned by gethostname).
16861 Now we can provide more helpful log messages when a relay guesses
16862 its IP address incorrectly (e.g. due to unexpected lines in
16863 /etc/hosts). Resolves ticket 2267.
16864 - Track how many "TAP" and "NTor" circuit handshake requests we get,
16865 and how many we complete, and log it every hour to help relay
16866 operators follow trends in network load. Addresses ticket 9658.
16868 o Minor features (log messages, diagnostics):
16869 - If we fail to free a microdescriptor because of bug 7164, log
16870 the filename and line number from which we tried to free it.
16871 - We compute the overhead from passing onionskins back and forth to
16872 cpuworkers, and report it when dumping statistics in response to
16873 SIGUSR1. Supports ticket 7291.
16874 - Add another diagnostic to the heartbeat message: track and log
16875 overhead that TLS is adding to the data we write. If this is
16876 high, we are sending too little data to SSL_write at a time.
16877 Diagnostic for bug 7707.
16878 - Log packaged cell fullness as part of the heartbeat message.
16879 Diagnosis to try to determine the extent of bug 7743.
16880 - Add more detail to a log message about relaxed timeouts, to help
16882 - When learning a fingerprint for a bridge, log its corresponding
16883 transport type. Implements ticket 7896.
16884 - Warn more aggressively when flushing microdescriptors to a
16885 microdescriptor cache fails, in an attempt to mitigate bug 8031,
16886 or at least make it more diagnosable.
16887 - Improve the log message when "Bug/attack: unexpected sendme cell
16888 from client" occurs, to help us track bug 8093.
16889 - Improve debugging output to help track down bug 8185 ("Bug:
16890 outgoing relay cell has n_chan==NULL. Dropping.")
16892 o Minor features (log messages, quieter bootstrapping):
16893 - Log fewer lines at level "notice" about our OpenSSL and Libevent
16894 versions and capabilities when everything is going right. Resolves
16895 part of ticket 6736.
16896 - Omit the first heartbeat log message, because it never has anything
16897 useful to say, and it clutters up the bootstrapping messages.
16898 Resolves ticket 6758.
16899 - Don't log about reloading the microdescriptor cache at startup. Our
16900 bootstrap warnings are supposed to tell the user when there's a
16901 problem, and our bootstrap notices say when there isn't. Resolves
16902 ticket 6759; bugfix on 0.2.2.6-alpha.
16903 - Don't log "I learned some more directory information" when we're
16904 reading cached directory information. Reserve it for when new
16905 directory information arrives in response to a fetch. Resolves
16907 - Don't complain about bootstrapping problems while hibernating.
16908 These complaints reflect a general code problem, but not one
16909 with any problematic effects (no connections are actually
16910 opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
16912 o Minor features (testing):
16913 - In our testsuite, create temporary directories with a bit more
16914 entropy in their name to make name collisions less likely. Fixes
16916 - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
16917 (P-256) Diffie-Hellman handshakes to src/or/bench.
16918 - Add benchmark functions to test onion handshake performance.
16921 - The DirServer option is now DirAuthority, for consistency with
16922 current naming patterns. You can still use the old DirServer form.
16924 o Minor bugfixes (protocol):
16925 - Fix the handling of a TRUNCATE cell when it arrives while the
16926 circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
16927 - When a Tor client gets a "truncated" relay cell, the first byte of
16928 its payload specifies why the circuit was truncated. We were
16929 ignoring this 'reason' byte when tearing down the circuit, resulting
16930 in the controller not being told why the circuit closed. Now we
16931 pass the reason from the truncated cell to the controller. Bugfix
16932 on 0.1.2.3-alpha; fixes bug 7039.
16933 - Fix a misframing issue when reading the version numbers in a
16934 VERSIONS cell. Previously we would recognize [00 01 00 02] as
16935 'version 1, version 2, and version 0x100', when it should have
16936 only included versions 1 and 2. Fixes bug 8059; bugfix on
16937 0.2.0.10-alpha. Reported pseudonymously.
16938 - Make the format and order of STREAM events for DNS lookups
16939 consistent among the various ways to launch DNS lookups. Fixes
16940 bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
16942 o Minor bugfixes (syscalls and disk interaction):
16943 - Always check the return values of functions fcntl() and
16944 setsockopt(). We don't believe these are ever actually failing in
16945 practice, but better safe than sorry. Also, checking these return
16946 values should please analysis tools like Coverity. Patch from
16947 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
16948 - Avoid double-closing the listener socket in our socketpair()
16949 replacement (used on Windows) in the case where the addresses on
16950 our opened sockets don't match what we expected. Fixes bug 9400;
16951 bugfix on 0.0.2pre7. Found by Coverity.
16952 - Correctly store microdescriptors and extrainfo descriptors that
16953 include an internal NUL byte. Fixes bug 8037; bugfix on
16954 0.2.0.1-alpha. Bug reported by "cypherpunks".
16955 - If for some reason we fail to write a microdescriptor while
16956 rebuilding the cache, do not let the annotations from that
16957 microdescriptor linger in the cache file, and do not let the
16958 microdescriptor stay recorded as present in its old location.
16959 Fixes bug 9047; bugfix on 0.2.2.6-alpha.
16960 - Use direct writes rather than stdio when building microdescriptor
16961 caches, in an attempt to mitigate bug 8031, or at least make it
16964 o Minor fixes (config options):
16965 - Warn and fail if a server is configured not to advertise any
16966 ORPorts at all. (We need *something* to put in our descriptor,
16967 or we just won't work.)
16968 - Behave correctly when the user disables LearnCircuitBuildTimeout
16969 but doesn't tell us what they would like the timeout to be. Fixes
16970 bug 6304; bugfix on 0.2.2.14-alpha.
16971 - Rename the (internal-use-only) UsingTestingNetworkDefaults option
16972 to start with a triple-underscore so the controller won't touch it.
16973 Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
16974 - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
16975 so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
16976 - When autodetecting the number of CPUs, use the number of available
16977 CPUs in preference to the number of configured CPUs. Inform the
16978 user if this reduces the number of available CPUs. Fixes bug 8002;
16979 bugfix on 0.2.3.1-alpha.
16980 - Command-line option "--version" implies "--quiet". Fixes bug 6997.
16981 - Make it an error when you set EntryNodes but disable UseGuardNodes,
16982 since it will (surprisingly to some users) ignore EntryNodes. Fixes
16983 bug 8180; bugfix on 0.2.3.11-alpha.
16984 - Avoid overflows when the user sets MaxCircuitDirtiness to a
16985 ridiculously high value, by imposing a (ridiculously high) 30-day
16986 maximum on MaxCircuitDirtiness.
16988 o Minor bugfixes (control protocol):
16989 - Stop sending a stray "(null)" in some cases for the server status
16990 "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
16992 - The ADDRMAP command can no longer generate an ill-formed error
16993 code on a failed MAPADDRESS. It now says "internal" rather than
16994 an English sentence fragment with spaces in the middle. Bugfix on
16995 Tor 0.2.0.19-alpha.
16997 o Minor bugfixes (clients / edges):
16998 - When we receive a RELAY_END cell with the reason DONE, or with no
16999 reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
17000 status as "connection refused". Previously we reported these cases
17001 as success but then immediately closed the connection. Fixes bug
17002 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
17003 - If the guard we choose first doesn't answer, we would try the
17004 second guard, but once we connected to the second guard we would
17005 abandon it and retry the first one, slowing down bootstrapping.
17006 The fix is to treat all our initially chosen guards as acceptable
17007 to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
17008 - When choosing which stream on a formerly stalled circuit to wake
17009 first, make better use of the platform's weak RNG. Previously,
17010 we had been using the % ("modulo") operator to try to generate a
17011 1/N chance of picking each stream, but this behaves badly with
17012 many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
17015 o Minor bugfixes (path bias detection):
17016 - If the state file's path bias counts are invalid (presumably from a
17017 buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
17018 additional checks and log messages to the scaling of Path Bias
17019 counts, in case there still are remaining issues with scaling.
17020 Should help resolve bug 8235.
17021 - Prevent rounding error in path bias counts when scaling
17022 them down, and use the correct scale factor default. Also demote
17023 some path bias related log messages down a level and make others
17024 less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
17025 - Remove a source of rounding error during path bias count scaling;
17026 don't count cannibalized circuits as used for path bias until we
17027 actually try to use them; and fix a circuit_package_relay_cell()
17028 warning message about n_chan==NULL. Fixes bug 7802.
17029 - Paste the description for PathBias parameters from the man
17030 page into or.h, so the code documents them too. Fixes bug 7982;
17031 bugfix on 0.2.3.17-beta.
17033 o Minor bugfixes (relays):
17034 - Stop trying to resolve our hostname so often (e.g. every time we
17035 think about doing a directory fetch). Now we reuse the cached
17036 answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
17037 and 2410 (bugfix on 0.1.2.2-alpha).
17038 - When examining the list of network interfaces to find our address,
17039 do not consider non-running or disabled network interfaces. Fixes
17040 bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
17042 o Minor bugfixes (blocking resistance):
17043 - Only disable TLS session ticket support when running as a TLS
17044 server. Now clients will blend better with regular Firefox
17045 connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
17047 o Minor bugfixes (IPv6):
17048 - Use square brackets around IPv6 addresses in numerous places
17049 that needed them, including log messages, HTTPS CONNECT proxy
17050 requests, TransportProxy statefile entries, and pluggable transport
17051 extra-info lines. Fixes bug 7011; patch by David Fifield.
17053 o Minor bugfixes (directory authorities):
17054 - Reject consensus votes with more than 64 known-flags. We aren't even
17055 close to that limit yet, and our code doesn't handle it correctly.
17056 Fixes bug 6833; bugfix on 0.2.0.1-alpha.
17057 - Correctly handle votes with more than 31 flags. Fixes bug 6853;
17058 bugfix on 0.2.0.3-alpha.
17060 o Minor bugfixes (memory leaks):
17061 - Avoid leaking memory if we fail to compute a consensus signature
17062 or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
17063 - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
17064 on 0.2.1.1-alpha; fixes bug 7816.
17065 - Fix a memory leak during safe-cookie controller authentication.
17066 Bugfix on 0.2.3.13-alpha; fixes bug 7816.
17067 - Free some more still-in-use memory at exit, to make hunting for
17068 memory leaks easier. Resolves bug 7029.
17070 o Minor bugfixes (code correctness):
17071 - Increase the width of the field used to remember a connection's
17072 link protocol version to two bytes. Harmless for now, since the
17073 only currently recognized versions are one byte long. Reported
17074 pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
17075 - Fix a crash when debugging unit tests on Windows: deallocate a
17076 shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
17077 bugfix on 0.2.2.17-alpha. Reported by "ultramage".
17078 - When detecting the largest possible file descriptor (in order to
17079 close all file descriptors when launching a new program), actually
17080 use _SC_OPEN_MAX. The old code for doing this was very, very broken.
17081 Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
17083 - Avoid a crash if we fail to generate an extrainfo descriptor.
17084 Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
17085 this is CID 718634.
17086 - Avoid an off-by-one error when checking buffer boundaries when
17087 formatting the exit status of a pluggable transport helper.
17088 This is probably not an exploitable bug, but better safe than
17089 sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
17091 - Get rid of a couple of harmless clang warnings, where we compared
17092 enums to ints. These warnings are newly introduced in clang 3.2.
17094 o Minor bugfixes (code cleanliness):
17095 - Avoid use of reserved identifiers in our C code. The C standard
17096 doesn't like us declaring anything that starts with an
17097 underscore, so let's knock it off before we get in trouble. Fix
17098 for bug 1031; bugfix on the first Tor commit.
17099 - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
17100 with large values. This situation was untriggered, but nevertheless
17101 incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
17102 - Fix an impossible buffer overrun in the AES unit tests. Fixes
17103 bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
17104 - Fix handling of rendezvous client authorization types over 8.
17105 Fixes bug 6861; bugfix on 0.2.1.5-alpha.
17106 - Remove a couple of extraneous semicolons that were upsetting the
17107 cparser library. Patch by Christian Grothoff. Fixes bug 7115;
17108 bugfix on 0.2.2.1-alpha.
17109 - When complaining about a client port on a public address, log
17110 which address we're complaining about. Fixes bug 4020; bugfix on
17111 0.2.3.3-alpha. Patch by Tom Fitzhenry.
17113 o Minor bugfixes (log messages, warnings):
17114 - If we encounter a write failure on a SOCKS connection before we
17115 finish our SOCKS handshake, don't warn that we closed the
17116 connection before we could send a SOCKS reply. Fixes bug 8427;
17117 bugfix on 0.1.0.1-rc.
17118 - Fix a directory authority warn caused when we have a large amount
17119 of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
17120 - Downgrade "Failed to hand off onionskin" messages to "debug"
17121 severity, since they're typically redundant with the "Your computer
17122 is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
17123 - Avoid spurious warnings when configuring multiple client ports of
17124 which only some are nonlocal. Previously, we had claimed that some
17125 were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
17128 o Minor bugfixes (log messages, other):
17129 - Fix log messages and comments to avoid saying "GMT" when we mean
17130 "UTC". Fixes bug 6113.
17131 - When rejecting a configuration because we were unable to parse a
17132 quoted string, log an actual error message. Fixes bug 7950; bugfix
17134 - Correctly recognize that [::1] is a loopback address. Fixes
17135 bug 8377; bugfix on 0.2.1.3-alpha.
17136 - Don't log inappropriate heartbeat messages when hibernating: a
17137 hibernating node is _expected_ to drop out of the consensus,
17138 decide it isn't bootstrapped, and so forth. Fixes bug 7302;
17139 bugfix on 0.2.3.1-alpha.
17140 - Eliminate several instances where we use "Nickname=ID" to refer to
17141 nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
17142 "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
17145 o Minor bugfixes (build):
17146 - Fix some bugs in tor-fw-helper-natpmp when trying to build and
17147 run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
17148 Fixes bug 7280; bugfix on 0.2.3.1-alpha.
17150 o Documentation fixes:
17151 - Make the torify manpage no longer refer to tsocks; torify hasn't
17152 supported tsocks since 0.2.3.14-alpha.
17153 - Make the tor manpage no longer reference tsocks.
17154 - Fix the GeoIPExcludeUnknown documentation to refer to
17155 ExcludeExitNodes rather than the currently nonexistent
17156 ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
17157 - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
17159 - Say "KBytes" rather than "KB" in the man page (for various values
17160 of K), to further reduce confusion about whether Tor counts in
17161 units of memory or fractions of units of memory. Resolves ticket 7054.
17162 - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
17163 names match. Fixes bug 7768.
17164 - Fix the documentation of HeartbeatPeriod to say that the heartbeat
17165 message is logged at notice, not at info.
17166 - Clarify the usage and risks of setting the ContactInfo torrc line
17167 for your relay or bridge. Resolves ticket 9854.
17168 - Add anchors to the manpage so we can link to the html version of
17169 the documentation for specific options. Resolves ticket 9866.
17170 - Replace remaining references to DirServer in man page and
17171 log entries. Resolves ticket 10124.
17173 o Removed features:
17174 - Stop exporting estimates of v2 and v3 directory traffic shares
17175 in extrainfo documents. They were unneeded and sometimes inaccurate.
17176 Also stop exporting any v2 directory request statistics. Resolves
17178 - Drop support for detecting and warning about versions of Libevent
17179 before 1.3e. Nothing reasonable ships with them any longer; warning
17180 the user about them shouldn't be needed. Resolves ticket 6826.
17181 - Now that all versions before 0.2.2.x are disallowed, we no longer
17182 need to work around their missing features. Remove a bunch of
17183 compatibility code.
17186 - The tor-tsocks.conf is no longer distributed or installed. We
17187 recommend that tsocks users use torsocks instead. Resolves
17189 - Remove some of the older contents of doc/ as obsolete; move others
17190 to torspec.git. Fixes bug 8965.
17192 o Code simplification:
17193 - Avoid using character buffers when constructing most directory
17194 objects: this approach was unwieldy and error-prone. Instead,
17195 build smartlists of strings, and concatenate them when done.
17196 - Rename "isin" functions to "contains", for grammar. Resolves
17198 - Rename Tor's logging function log() to tor_log(), to avoid conflicts
17199 with the natural logarithm function from the system libm. Resolves
17201 - Start using OpenBSD's implementation of queue.h, so that we don't
17202 need to hand-roll our own pointer and list structures whenever we
17203 need them. (We can't rely on a sys/queue.h, since some operating
17204 systems don't have them, and the ones that do have them don't all
17205 present the same extensions.)
17206 - Start using OpenBSD's implementation of queue.h (originally by
17208 - Enhance our internal sscanf replacement so that we can eliminate
17209 the last remaining uses of the system sscanf. (Though those uses
17210 of sscanf were safe, sscanf itself is generally error prone, so
17211 we want to eliminate when we can.) Fixes ticket 4195 and Coverity
17213 - Replace all calls to snprintf() outside of src/ext with
17214 tor_snprintf(). Also remove the #define to replace snprintf with
17215 _snprintf on Windows; they have different semantics, and all of
17216 our callers should be using tor_snprintf() anyway. Fixes bug 7304.
17219 - Add a wrapper function for the common "log a message with a
17221 - Split the onion.c file into separate modules for the onion queue
17222 and the different handshakes it supports.
17223 - Move the client-side address-map/virtual-address/DNS-cache code
17224 out of connection_edge.c into a new addressmap.c module.
17225 - Move the entry node code from circuitbuild.c to its own file.
17226 - Move the circuit build timeout tracking code from circuitbuild.c
17228 - Source files taken from other packages now reside in src/ext;
17229 previously they were scattered around the rest of Tor.
17230 - Move the generic "config" code into a new file, and have "config.c"
17231 hold only torrc- and state-related code. Resolves ticket 6823.
17232 - Move the core of our "choose a weighted element at random" logic
17233 into its own function, and give it unit tests. Now the logic is
17234 testable, and a little less fragile too.
17235 - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
17236 - Move last_reachable and testing_since from routerinfo_t to node_t.
17237 Implements ticket 5529.
17238 - Add replaycache_t structure, functions and unit tests, then refactor
17239 rend_service_introduce() to be more clear to read, improve, debug,
17240 and test. Resolves bug 6177.
17243 - Remove some now-needless code that tried to aggressively flush
17244 OR connections as data was added to them. Since 0.2.0.1-alpha, our
17245 cell queue logic has saved us from the failure mode that this code
17246 was supposed to prevent. Removing this code will limit the number
17247 of baroque control flow paths through Tor's network logic. Reported
17248 pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
17249 - Remove unused code for parsing v1 directories and "running routers"
17250 documents. Fixes bug 6887.
17251 - Remove the marshalling/unmarshalling code for sending requests to
17252 cpuworkers over a socket, and instead just send structs. The
17253 recipient will always be the same Tor binary as the sender, so
17254 any encoding is overkill.
17255 - Remove the testing_since field of node_t, which hasn't been used
17256 for anything since 0.2.0.9-alpha.
17257 - Finally remove support for malloc_good_size and malloc_usable_size.
17258 We had hoped that these functions would let us eke a little more
17259 memory out of our malloc implementation. Unfortunately, the only
17260 implementations that provided these functions are also ones that
17261 are already efficient about not overallocation: they never got us
17262 more than 7 or so bytes per allocation. Removing them saves us a
17263 little code complexity and a nontrivial amount of build complexity.
17266 Changes in version 0.2.3.25 - 2012-11-19
17267 The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
17268 Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
17269 Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
17270 programmer, and friend. Unstinting in his dedication to the cause of
17271 freedom, he inspired and helped many of us as we began our work on
17272 anonymity, and inspires us still. Please honor his memory by writing
17273 software to protect people's freedoms, and by helping others to do so.
17275 Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
17276 significantly reduced directory overhead (via microdescriptors),
17277 enormous crypto performance improvements for fast relays on new
17278 enough hardware, a new v3 TLS handshake protocol that can better
17279 resist fingerprinting, support for protocol obfuscation plugins (aka
17280 pluggable transports), better scalability for hidden services, IPv6
17281 support for bridges, performance improvements like allowing clients
17282 to skip the first round-trip on the circuit ("optimistic data") and
17283 refilling token buckets more often, a new "stream isolation" design
17284 to isolate different applications on different circuits, and many
17285 stability, security, and privacy fixes.
17287 Major features (v3 directory protocol):
17288 - Clients now use microdescriptors instead of regular descriptors
17289 to build circuits. Microdescriptors are authority-generated
17290 summaries of regular descriptors' contents, designed to change very
17291 rarely (see proposal 158 for details). This feature is designed
17292 to save bandwidth, especially for clients on slow internet
17293 connections. Use "UseMicrodescriptors 0" to disable it.
17294 - Caches now download, cache, and serve microdescriptors, as well
17295 as multiple "flavors" of the consensus, including a flavor that
17296 describes microdescriptors.
17298 o Major features (build hardening):
17299 - Enable gcc and ld hardening by default. Resolves ticket 5210.
17301 o Major features (relay scaling):
17302 - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
17303 instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
17304 vectorized AES implementations as appropriate. These can be much,
17305 much faster than other AES implementations.
17306 - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
17307 implementation. It makes AES_CTR about 7% faster than our old one
17308 (which was about 10% faster than the one OpenSSL used to provide).
17309 Resolves ticket 4526.
17310 - Use OpenSSL's EVP interface for AES encryption, so that all AES
17311 operations can use hardware acceleration (if present). Resolves
17313 - Unconditionally use OpenSSL's AES implementation instead of our
17314 old built-in one. OpenSSL's AES has been better for a while, and
17315 relatively few servers should still be on any version of OpenSSL
17316 that doesn't have good optimized assembly AES.
17318 o Major features (blocking resistance):
17319 - Update TLS cipher list to match Firefox 8 and later. Resolves
17321 - Remove support for clients falsely claiming to support standard
17322 ciphersuites that they can actually provide. As of modern OpenSSL
17323 versions, it's not necessary to fake any standard ciphersuite,
17324 and doing so prevents us from using better ciphersuites in the
17325 future, since servers can't know whether an advertised ciphersuite
17326 is really supported or not. Some hosts -- notably, ones with very
17327 old versions of OpenSSL or where OpenSSL has been built with ECC
17328 disabled -- will stand out because of this change; TBB users should
17329 not be affected. Implements the client side of proposal 198.
17330 - Implement a new handshake protocol (v3) for authenticating Tors to
17331 each other over TLS. It should be more resistant to fingerprinting
17332 than previous protocols, and should require less TLS hacking for
17333 future Tor implementations. Implements proposal 176.
17334 - Allow variable-length padding cells, to disguise the length of
17335 Tor's TLS records. Implements part of proposal 184.
17336 - While we're trying to bootstrap, record how many TLS connections
17337 fail in each state, and report which states saw the most failures
17338 in response to any bootstrap failures. This feature may speed up
17339 diagnosis of censorship events. Implements ticket 3116.
17341 o Major features (pluggable transports):
17342 - Clients and bridges can now be configured to use a separate
17343 "transport" proxy. This approach makes the censorship arms race
17344 easier by allowing bridges to use protocol obfuscation plugins.
17345 Implements proposal 180 (tickets 2841 and 3472).
17347 o Major features (DoS resistance):
17348 - Now that Tor 0.2.0.x is completely deprecated, enable the final
17349 part of "Proposal 110: Avoiding infinite length circuits" by
17350 refusing all circuit-extend requests that do not use a relay_early
17351 cell. This change helps Tor resist a class of denial-of-service
17352 attacks by limiting the maximum circuit length.
17353 - Tear down the circuit if we get an unexpected SENDME cell. Clients
17354 could use this trick to make their circuits receive cells faster
17355 than our flow control would have allowed, or to gum up the network,
17356 or possibly to do targeted memory denial-of-service attacks on
17357 entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
17358 from July 2002, before the release of Tor 0.0.0.
17360 o Major features (hidden services):
17361 - Adjust the number of introduction points that a hidden service
17362 will try to maintain based on how long its introduction points
17363 remain in use and how many introductions they handle. Fixes
17365 - Add a "tor2web mode" for clients that want to connect to hidden
17366 services non-anonymously (and possibly more quickly). As a safety
17367 measure to try to keep users from turning this on without knowing
17368 what they are doing, tor2web mode must be explicitly enabled at
17369 compile time, and a copy of Tor compiled to run in tor2web mode
17370 cannot be used as a normal Tor client. Implements feature 2553.
17372 o Major features (IPv6):
17373 - Clients can now connect to private bridges over IPv6. Bridges
17374 still need at least one IPv4 address in order to connect to
17375 other relays. Note that we don't yet handle the case where the
17376 user has two bridge lines for the same bridge (one IPv4, one
17377 IPv6). Implements parts of proposal 186.
17379 o Major features (directory authorities):
17380 - Use a more secure consensus parameter voting algorithm. Now at
17381 least three directory authorities or a majority of them must
17382 vote on a given parameter before it will be included in the
17383 consensus. Implements proposal 178.
17384 - Remove the artificially low cutoff of 20KB to guarantee the Fast
17385 flag. In the past few years the average relay speed has picked
17386 up, and while the "top 7/8 of the network get the Fast flag" and
17387 "all relays with 20KB or more of capacity get the Fast flag" rules
17388 used to have the same result, now the top 7/8 of the network has
17389 a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
17391 o Major features (performance):
17392 - Exit nodes now accept and queue data on not-yet-connected streams.
17393 Previously, the client wasn't allowed to send data until the
17394 stream was connected, which slowed down all connections. This
17395 change will enable clients to perform a "fast-start" on streams
17396 and send data without having to wait for a confirmation that the
17397 stream has opened. Patch from Ian Goldberg; implements the server
17398 side of Proposal 174.
17399 - When using an exit relay running 0.2.3.x, clients can now
17400 "optimistically" send data before the exit relay reports that
17401 the stream has opened. This saves a round trip when starting
17402 connections where the client speaks first (such as web browsing).
17403 This behavior is controlled by a consensus parameter (currently
17404 disabled). To turn it on or off manually, use the "OptimisticData"
17405 torrc option. Implements proposal 181; code by Ian Goldberg.
17406 - Add a new TokenBucketRefillInterval option to refill token buckets
17407 more frequently than once per second. This should improve network
17408 performance, alleviate queueing problems, and make traffic less
17409 bursty. Implements proposal 183; closes ticket 3630. Design by
17410 Florian Tschorsch and Björn Scheuermann; implementation by
17412 - Raise the threshold of server descriptors needed (75%) and exit
17413 server descriptors needed (50%) before we will declare ourselves
17414 bootstrapped. This will make clients start building circuits a
17415 little later, but makes the initially constructed circuits less
17416 skewed and less in conflict with further directory fetches. Fixes
17419 o Major features (relays):
17420 - Relays now try regenerating and uploading their descriptor more
17421 frequently if they are not listed in the consensus, or if the
17422 version of their descriptor listed in the consensus is too
17423 old. This fix should prevent situations where a server declines
17424 to re-publish itself because it has done so too recently, even
17425 though the authorities decided not to list its recent-enough
17426 descriptor. Fix for bug 3327.
17428 o Major features (stream isolation):
17429 - You can now configure Tor so that streams from different
17430 applications are isolated on different circuits, to prevent an
17431 attacker who sees your streams as they leave an exit node from
17432 linking your sessions to one another. To do this, choose some way
17433 to distinguish the applications: have them connect to different
17434 SocksPorts, or have one of them use SOCKS4 while the other uses
17435 SOCKS5, or have them pass different authentication strings to the
17436 SOCKS proxy. Then, use the new SocksPort syntax to configure the
17437 degree of isolation you need. This implements Proposal 171.
17438 - There's a new syntax for specifying multiple client ports (such as
17439 SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
17440 multiple *Port entries with full addr:port syntax on each.
17441 The old *ListenAddress format is still supported, but you can't
17442 mix it with the new *Port syntax.
17444 o Major features (bufferevents):
17445 - Tor can now optionally build with the "bufferevents" buffered IO
17446 backend provided by Libevent 2. To use this feature, make sure you
17447 have the latest possible version of Libevent, and pass the
17448 --enable-bufferevents flag to configure when building Tor from
17449 source. This feature will make our networking code more flexible,
17450 let us stack layers on each other, and let us use more efficient
17451 zero-copy transports where available.
17452 - Add experimental support for running on Windows with IOCP and no
17453 kernel-space socket buffers. This feature is controlled by a new
17454 "UserspaceIOCPBuffers" config option (off by default), which has
17455 no effect unless Tor has been built with bufferevents enabled,
17456 you're running on Windows, and you've set "DisableIOCP 0". In the
17457 long run, this may help solve or mitigate bug 98.
17459 o Major features (path selection):
17460 - The EntryNodes option can now include country codes like {de} or IP
17461 addresses or network masks. Previously we had disallowed these
17462 options because we didn't have an efficient way to keep the list up
17463 to date. Addresses ticket 1982, but see bug 2798 for an unresolved
17466 o Major features (port forwarding):
17467 - Add support for automatic port mapping on the many home routers
17468 that support NAT-PMP or UPnP. To build the support code, you'll
17469 need to have the libnatpnp library and/or the libminiupnpc library,
17470 and you'll need to enable the feature specifically by passing
17471 "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
17472 it on, use the new PortForwarding option.
17474 o Major features (logging):
17475 - Add a new 'Heartbeat' log message type to periodically log a message
17476 describing Tor's status at level Notice. This feature is meant for
17477 operators who log at notice, and want to make sure that their Tor
17478 server is still working. Implementation by George Kadianakis.
17479 - Make logging resolution configurable with a new LogTimeGranularity
17480 option, and change the default from 1 millisecond to 1 second.
17481 Implements enhancement 1668.
17483 o Major features (other):
17484 - New "DisableNetwork" config option to prevent Tor from launching any
17485 connections or accepting any connections except on a control port.
17486 Bundles and controllers can set this option before letting Tor talk
17487 to the rest of the network, for example to prevent any connections
17488 to a non-bridge address. Packages like Orbot can also use this
17489 option to instruct Tor to save power when the network is off.
17490 - Try to use system facilities for enumerating local interface
17491 addresses, before falling back to our old approach (which was
17492 binding a UDP socket, and calling getsockname() on it). That
17493 approach was scaring OS X users whose draconian firewall
17494 software warned about binding to UDP sockets regardless of
17495 whether packets were sent. Now we try to use getifaddrs(),
17496 SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
17497 system supports. Resolves ticket 1827.
17498 - Add experimental support for a "defaults" torrc file to be parsed
17499 before the regular torrc. Torrc options override the defaults file's
17500 options in the same way that the command line overrides the torrc.
17501 The SAVECONF controller command saves only those options which
17502 differ between the current configuration and the defaults file. HUP
17503 reloads both files. Implements task 4552.
17505 o New directory authorities:
17506 - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
17507 authority. Closes ticket 5749.
17509 o Security/privacy fixes:
17510 - Avoid read-from-freed-memory and double-free bugs that could occur
17511 when a DNS request fails while launching it. Fixes bug 6480;
17512 bugfix on 0.2.0.1-alpha.
17513 - Reject any attempt to extend to an internal address. Without
17514 this fix, a router could be used to probe addresses on an internal
17515 network to see whether they were accepting connections. Fixes bug
17516 6710; bugfix on 0.0.8pre1.
17517 - Close any connection that sends unrecognized junk before the TLS
17518 handshake. Solves an issue noted in bug 4369.
17519 - The advertised platform of a relay now includes only its operating
17520 system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
17521 its service pack level (for Windows) or its CPU architecture
17522 (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
17523 can insert an extra string in the platform line by setting the
17524 preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
17525 - Disable TLS session tickets. OpenSSL's implementation was giving
17526 our TLS session keys the lifetime of our TLS context objects, when
17527 perfect forward secrecy would want us to discard anything that
17528 could decrypt a link connection as soon as the link connection
17529 was closed. Fixes bug 7139; bugfix on all versions of Tor linked
17530 against OpenSSL 1.0.0 or later. Found by Florent Daignière.
17531 - Tor tries to wipe potentially sensitive data after using it, so
17532 that if some subsequent security failure exposes Tor's memory,
17533 the damage will be limited. But we had a bug where the compiler
17534 was eliminating these wipe operations when it decided that the
17535 memory was no longer visible to a (correctly running) program,
17536 hence defeating our attempt at defense in depth. We fix that
17537 by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
17538 is unlikely to optimize away. Future versions of Tor may use
17539 a less ridiculously heavy approach for this. Fixes bug 7352.
17540 Reported in an article by Andrey Karpov.
17542 o Major bugfixes (crashes and asserts):
17543 - Avoid a pair of double-free and use-after-mark bugs that can
17544 occur with certain timings in canceled and re-received DNS
17545 requests. Fixes bug 6472; bugfix on 0.0.7rc1.
17546 - Fix a denial of service attack by which any directory authority
17547 could crash all the others, or by which a single v2 directory
17548 authority could crash everybody downloading v2 directory
17549 information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
17550 - Fix an assert that directory authorities could trigger on sighup
17551 during some configuration state transitions. We now don't treat
17552 it as a fatal error when the new descriptor we just generated in
17553 init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
17554 - Avoid segfault when starting up having run with an extremely old
17555 version of Tor and parsing its state file. Fixes bug 6801; bugfix
17558 o Major bugfixes (clients):
17559 - If we are unable to find any exit that supports our predicted ports,
17560 stop calling them predicted, so that we don't loop and build
17561 hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
17562 which introduced predicted ports.
17563 - Check at each new consensus whether our entry guards were picked
17564 long enough ago that we should rotate them. Previously, we only
17565 did this check at startup, which could lead to us holding a guard
17566 indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
17567 - When fetching a bridge descriptor from a bridge authority,
17568 always do so anonymously, whether we have been able to open
17569 circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
17570 This behavior makes it *safer* to use UpdateBridgesFromAuthority,
17571 but we'll need to wait for bug 6010 before it's actually usable.
17573 o Major bugfixes (directory voting):
17574 - Check more thoroughly to prevent a rogue authority from
17575 double-voting on any consensus directory parameter. Previously,
17576 authorities would crash in this case if the total number of
17577 votes for any parameter exceeded the number of active voters,
17578 but would let it pass otherwise. Partially fixes bug 5786; bugfix
17580 - When computing weight parameters, behave more robustly in the
17581 presence of a bad bwweightscale value. Previously, the authorities
17582 would crash if they agreed on a sufficiently broken weight_scale
17583 value; now, they use a reasonable default and carry on. Fixes the
17584 rest of bug 5786; bugfix on 0.2.2.17-alpha.
17585 - If authorities are unable to get a v2 consensus document from other
17586 directory authorities, they no longer fall back to fetching
17587 them from regular directory caches. Fixes bug 5635; bugfix on
17588 0.2.2.26-beta, where routers stopped downloading v2 consensus
17589 documents entirely.
17591 o Major bugfixes (relays):
17592 - Fix a bug handling SENDME cells on nonexistent streams that could
17593 result in bizarre window values. Report and patch contributed
17594 pseudonymously. Fixes part of bug 6271. This bug was introduced
17595 before the first Tor release, in svn commit r152.
17596 - Don't update the AccountingSoftLimitHitAt state file entry whenever
17597 tor gets started. This prevents a wrong average bandwidth
17598 estimate, which would cause relays to always start a new accounting
17599 interval at the earliest possible moment. Fixes bug 2003; bugfix
17600 on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
17601 immensely in tracking this bug down.
17602 - Fix a possible crash bug when checking for deactivated circuits
17603 in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
17604 bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
17605 - Set the SO_REUSEADDR socket option before we call bind() on outgoing
17606 connections. This change should allow busy exit relays to stop
17607 running out of available sockets as quickly. Fixes bug 4950;
17608 bugfix on 0.2.2.26-beta.
17610 o Major bugfixes (blocking resistance):
17611 - Bridges no longer include their address in NETINFO cells on outgoing
17612 OR connections, to allow them to blend in better with clients.
17613 Removes another avenue for enumerating bridges. Reported by
17614 "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
17615 cells were introduced.
17616 - Warn the user when HTTPProxy, but no other proxy type, is
17617 configured. This can cause surprising behavior: it doesn't send
17618 all of Tor's traffic over the HTTPProxy -- it sends unencrypted
17619 directory traffic only. Resolves ticket 4663.
17621 o Major bugfixes (hidden services):
17622 - Improve hidden service robustness: when an attempt to connect to
17623 a hidden service ends, be willing to refetch its hidden service
17624 descriptors from each of the HSDir relays responsible for them
17625 immediately. Previously, we would not consider refetching the
17626 service's descriptors from each HSDir for 15 minutes after the last
17627 fetch, which was inconvenient if the hidden service was not running
17628 during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
17629 - Hidden services now ignore the timestamps on INTRODUCE2 cells.
17630 They used to check that the timestamp was within 30 minutes
17631 of their system clock, so they could cap the size of their
17632 replay-detection cache, but that approach unnecessarily refused
17633 service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
17634 the v3 intro-point protocol (the first one which sent a timestamp
17635 field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
17636 - When one of a hidden service's introduction points appears to be
17637 unreachable, stop trying it. Previously, we would keep trying
17638 to build circuits to the introduction point until we lost the
17639 descriptor, usually because the user gave up and restarted Tor.
17640 Fixes part of bug 3825.
17642 o Changes to default torrc file:
17643 - Stop listing "socksport 9050" in torrc.sample. We open a socks
17644 port on 9050 by default anyway, so this should not change anything
17646 - Stop mentioning the deprecated *ListenAddress options in
17647 torrc.sample. Fixes bug 5438.
17648 - Document unit of bandwidth-related options in sample torrc.
17650 - Fix broken URLs in the sample torrc file, and tell readers about
17651 the OutboundBindAddress, ExitPolicyRejectPrivate, and
17652 PublishServerDescriptor options. Addresses bug 4652.
17654 o Minor features (directory authorities):
17655 - Consider new, removed or changed IPv6 OR ports a non-cosmetic
17656 change when the authority is deciding whether to accept a newly
17657 uploaded descriptor. Implements ticket 6423.
17658 - Directory authorities are now a little more lenient at accepting
17659 older router descriptors, or newer router descriptors that don't
17660 make big changes. This should help ameliorate past and future
17661 issues where routers think they have uploaded valid descriptors,
17662 but the authorities don't think so. Fix for ticket 2479.
17663 - Authority operators can now vote for all relays in a given
17664 set of countries to be BadDir/BadExit/Invalid/Rejected.
17665 - Provide two consensus parameters (FastFlagMinThreshold and
17666 FastFlagMaxThreshold) to control the range of allowable bandwidths
17667 for the Fast directory flag. These allow authorities to run
17668 experiments on appropriate requirements for being a "Fast" node.
17669 The AuthDirFastGuarantee config value still applies. Implements
17672 o Minor features (bridges / bridge authorities):
17673 - Make bridge SSL certificates a bit more stealthy by using random
17674 serial numbers, in the same fashion as OpenSSL when generating
17675 self-signed certificates. Implements ticket 4584.
17676 - Tag a bridge's descriptor as "never to be sent unencrypted".
17677 This shouldn't matter, since bridges don't open non-anonymous
17678 connections to the bridge authority and don't allow unencrypted
17679 directory connections from clients, but we might as well make
17680 sure. Closes bug 5139.
17681 - The Bridge Authority now writes statistics on how many bridge
17682 descriptors it gave out in total, and how many unique descriptors
17683 it gave out. It also lists how often the most and least commonly
17684 fetched descriptors were given out, as well as the median and
17685 25th/75th percentile. Implements tickets 4200 and 4294.
17687 o Minor features (IPv6):
17688 - Make the code that clients use to detect an address change be
17689 IPv6-aware, so that it won't fill clients' logs with error
17690 messages when trying to get the IPv4 address of an IPv6
17691 connection. Implements ticket 5537.
17692 - Relays now understand an IPv6 address when they get one from a
17693 directory server. Resolves ticket 4875.
17695 o Minor features (hidden services):
17696 - Expire old or over-used hidden service introduction points.
17697 Required by fix for bug 3460.
17698 - Reduce the lifetime of elements of hidden services' Diffie-Hellman
17699 public key replay-detection cache from 60 minutes to 5 minutes. This
17700 replay-detection cache is now used only to detect multiple
17701 INTRODUCE2 cells specifying the same rendezvous point, so we can
17702 avoid launching multiple simultaneous attempts to connect to it.
17703 - When a hidden service's introduction point times out, consider
17704 trying it again during the next attempt to connect to the
17705 HS. Previously, we would not try it again unless a newly fetched
17706 descriptor contained it. Required by fixes for bugs 1297 and 3825.
17708 o Minor features (relays):
17709 - Relays now include a reason for regenerating their descriptors
17710 in an HTTP header when uploading to the authorities. This will
17711 make it easier to debug descriptor-upload issues in the future.
17712 - Turn on directory request statistics by default and include them in
17713 extra-info descriptors. Don't break if we have no GeoIP database.
17714 - Replace files in stats/ rather than appending to them. Now that we
17715 include statistics in extra-info descriptors, it makes no sense to
17716 keep old statistics forever. Implements ticket 2930.
17717 - Relays that set "ConnDirectionStatistics 1" write statistics on the
17718 bidirectional use of connections to disk every 24 hours.
17719 - Add a GeoIP file digest to the extra-info descriptor. Implements
17722 o Minor features (new config options):
17723 - New config option "DynamicDHGroups" (disabled by default) provides
17724 each bridge with a unique prime DH modulus to be used during
17725 SSL handshakes. This option attempts to help against censors
17726 who might use the Apache DH modulus as a static identifier for
17727 bridges. Addresses ticket 4548.
17728 - New config option "DisableDebuggerAttachment" (on by default)
17729 to prevent basic debugging attachment attempts by other processes.
17730 Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
17731 - Ordinarily, Tor does not count traffic from private addresses (like
17732 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
17733 There is now a new option, CountPrivateBandwidth, to disable this
17734 behavior. Patch from Daniel Cagara.
17736 o Minor features (different behavior for old config options):
17737 - Allow MapAddress directives to specify matches against super-domains,
17738 as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
17739 Implements issue 933.
17740 - Don't disable the DirPort when we cannot exceed our AccountingMax
17741 limit during this interval because the effective bandwidthrate is
17742 low enough. This is useful in a situation where AccountMax is only
17743 used as an additional safeguard or to provide statistics.
17744 - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
17745 implements ticket 3439.
17746 - When configuring a large set of nodes in EntryNodes, and there are
17747 enough of them listed as Guard so that we don't need to consider
17748 the non-guard entries, prefer the ones listed with the Guard flag.
17749 - If you set the NumCPUs option to 0, Tor will now try to detect how
17750 many CPUs you have. This is the new default behavior.
17751 - The NodeFamily option -- which let you declare that you want to
17752 consider nodes to be part of a family whether they list themselves
17753 that way or not -- now allows IP address ranges and country codes.
17755 o Minor features (new command-line config behavior):
17756 - Slightly change behavior of "list" options (that is, config
17757 options that can appear more than once) when they appear both in
17758 torrc and on the command line. Previously, the command-line options
17759 would be appended to the ones from torrc. Now, the command-line
17760 options override the torrc options entirely. This new behavior
17761 allows the user to override list options (like exit policies and
17762 ports to listen on) from the command line, rather than simply
17763 appending to the list.
17764 - You can get the old (appending) command-line behavior for "list"
17765 options by prefixing the option name with a "+".
17766 - You can remove all the values for a "list" option from the command
17767 line without adding any new ones by prefixing the option name
17770 o Minor features (controller, new events):
17771 - Extend the control protocol to report flags that control a circuit's
17772 path selection in CIRC events and in replies to 'GETINFO
17773 circuit-status'. Implements part of ticket 2411.
17774 - Extend the control protocol to report the hidden service address
17775 and current state of a hidden-service-related circuit in CIRC
17776 events and in replies to 'GETINFO circuit-status'. Implements part
17778 - Include the creation time of a circuit in CIRC and CIRC2
17779 control-port events and the list produced by the 'GETINFO
17780 circuit-status' control-port command.
17781 - Add a new CONF_CHANGED event so that controllers can be notified
17782 of any configuration changes made by other controllers, or by the
17783 user. Implements ticket 1692.
17784 - Add a new SIGNAL event to the controller interface so that
17785 controllers can be notified when Tor handles a signal. Resolves
17786 issue 1955. Patch by John Brooks.
17788 o Minor features (controller, new getinfo options):
17789 - Expose our view of whether we have gone dormant to the controller,
17790 via a new "GETINFO dormant" value. Torbutton and other controllers
17791 can use this to avoid doing periodic requests through Tor while
17792 it's dormant (bug 4718). Resolves ticket 5954.
17793 - Add a new GETINFO option to get total bytes read and written. Patch
17794 from pipe, revised by atagar. Resolves ticket 2345.
17795 - Implement new GETINFO controller fields to provide information about
17796 the Tor process's pid, euid, username, and resource limits.
17798 o Minor features (controller, other):
17799 - Allow controllers to request an event notification whenever a
17800 circuit is cannibalized or its purpose is changed. Implements
17801 part of ticket 3457.
17802 - Use absolute path names when reporting the torrc filename in the
17803 control protocol, so a controller can more easily find the torrc
17804 file. Resolves bug 1101.
17805 - When reporting the path to the cookie file to the controller,
17806 give an absolute path. Resolves ticket 4881.
17808 o Minor features (log messages):
17809 - Add more information to a log statement that might help track down
17810 bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
17811 non-IP address" messages (or any Bug messages, for that matter!),
17812 please let us know about it.
17813 - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
17814 EntryNodes will have no effect. Resolves issue 2571.
17815 - Try to make the introductory warning message that Tor prints on
17816 startup more useful for actually finding help and information.
17817 Resolves ticket 2474.
17818 - When the system call to create a listener socket fails, log the
17819 error message explaining why. This may help diagnose bug 4027.
17821 o Minor features (other):
17822 - When we fail to initialize Libevent, retry with IOCP disabled so we
17823 don't need to turn on multi-threading support in Libevent, which in
17824 turn requires a working socketpair(). This is a workaround for bug
17825 4457, which affects Libevent versions from 2.0.1-alpha through
17827 - When starting as root and then changing our UID via the User
17828 control option, and we have a ControlSocket configured, make sure
17829 that the ControlSocket is owned by the same account that Tor will
17830 run under. Implements ticket 3421; fix by Jérémy Bobbio.
17831 - Accept attempts to include a password authenticator in the
17832 handshake, as supported by SOCKS5. This handles SOCKS clients that
17833 don't know how to omit a password when authenticating. Resolves
17835 - Check for and recover from inconsistency in the microdescriptor
17836 cache. This will make it harder for us to accidentally free a
17837 microdescriptor without removing it from the appropriate data
17838 structures. Fixes issue 3135; issue noted by "wanoskarnet".
17839 - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
17841 o Minor bugfixes (code security):
17842 - Prevent a null-pointer dereference when receiving a data cell
17843 for a nonexistent stream when the circuit in question has an
17844 empty deliver window. We don't believe this is triggerable,
17845 since we don't currently allow deliver windows to become empty,
17846 but the logic is tricky enough that it's better to make the code
17847 robust. Fixes bug 5541; bugfix on 0.0.2pre14.
17848 - Fix a (harmless) integer overflow in cell statistics reported by
17849 some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
17850 - Fix our implementation of crypto_random_hostname() so it can't
17851 overflow on ridiculously large inputs. (No Tor version has ever
17852 provided this kind of bad inputs, but let's be correct in depth.)
17853 Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
17854 - Add a (probably redundant) memory clear between iterations of
17855 the router status voting loop, to prevent future coding errors
17856 where data might leak between iterations of the loop. Resolves
17859 o Minor bugfixes (wrapper functions):
17860 - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
17861 utility function used in the control-port code). This shouldn't
17862 ever happen unless Tor is completely out of memory, but if it did
17863 happen and Tor somehow recovered from it, Tor could have sent a log
17864 message to a control port in the middle of a reply to a controller
17865 command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
17866 - Fix some (not actually triggerable) buffer size checks in usage of
17867 tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
17869 - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
17870 bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
17871 - Enforce correct return behavior of tor_vsscanf() when the '%%'
17872 pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
17873 - Make our replacement implementation of strtok_r() compatible with
17874 the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
17875 bugfix on 0.2.2.1-alpha.
17876 - Find more places in the code that should have been testing for
17877 invalid sockets using the SOCKET_OK macro. Required for a fix
17878 for bug 4533. Bugfix on 0.2.2.28-beta.
17880 o Minor bugfixes (code correctness):
17881 - Check return value of fputs() when writing authority certificate
17882 file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
17883 - When building Tor on Windows with -DUNICODE (not default), ensure
17884 that error messages, filenames, and DNS server names are always
17885 NUL-terminated when we convert them to a single-byte encoding.
17886 Fixes bug 5909; bugfix on 0.2.2.16-alpha.
17887 - Fix a memory leak when trying to launch a DNS request when the
17888 nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
17890 - Correct file sizes when reading binary files on Cygwin, to avoid
17891 a bug where Tor would fail to read its state file. Fixes bug 6844;
17892 bugfix on 0.1.2.7-alpha.
17893 - Make sure to set *socket_error in all error cases in
17894 connection_connect(), so it can't produce a warning about
17895 errno being zero from errno_to_orconn_end_reason(). Bugfix on
17896 0.2.1.1-alpha; resolves ticket 6028.
17897 - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
17898 bug 4532; found by "troll_un".
17900 o Minor bugfixes (clients):
17901 - Allow one-hop directory-fetching circuits the full "circuit build
17902 timeout" period, rather than just half of it, before failing them
17903 and marking the relay down. This fix should help reduce cases where
17904 clients declare relays (or worse, bridges) unreachable because
17905 the TLS handshake takes a few seconds to complete. Fixes bug 6743;
17906 bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
17908 - Ensure we don't cannibalize circuits that are longer than three hops
17909 already, so we don't end up making circuits with 5 or more
17910 hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
17911 0.1.0.1-rc which introduced cannibalization.
17913 o Minor bugfixes (relays):
17914 - Don't publish a new relay descriptor when we reload our onion key,
17915 unless the onion key has actually changed. Fixes bug 3263 and
17916 resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
17917 - When relays refuse a "create" cell because their queue of pending
17918 create cells is too big (typically because their cpu can't keep up
17919 with the arrival rate), send back reason "resource limit" rather
17920 than reason "internal", so network measurement scripts can get a
17921 more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
17922 - Exit nodes don't need to fetch certificates for authorities that
17923 they don't recognize; only directory authorities, bridges,
17924 and caches need to do that. Fixes part of bug 2297; bugfix on
17927 o Minor bugfixes (directory authority / mirrors):
17928 - Avoid O(n^2) performance characteristics when parsing a large
17929 extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
17930 - Authorities no longer include any router in their microdescriptor
17931 consensuses for which they couldn't generate or agree on a
17932 microdescriptor. Fixes the second piece of bug 6404; fix on
17934 - When checking for requested signatures on the latest consensus
17935 before serving it to a client, make sure to check the right
17936 consensus flavor. Bugfix on 0.2.2.6-alpha.
17937 - Fix an edge case where TestingTorNetwork is set but the authorities
17938 and relays all have an uptime of zero, so the private Tor network
17939 could briefly lack support for hidden services. Fixes bug 3886;
17940 bugfix on 0.2.2.18-alpha.
17941 - Directory caches no longer refuse to clean out descriptors because
17942 of missing v2 networkstatus documents, unless they're configured
17943 to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
17944 0.2.2.26-beta. Patch by Daniel Bryg.
17945 - Don't serve or accept v2 hidden service descriptors over a relay's
17946 DirPort. It's never correct to do so, and disabling it might
17947 make it more annoying to exploit any bugs that turn up in the
17948 descriptor-parsing code. Fixes bug 7149.
17950 o Minor bugfixes (hidden services, client-side):
17951 - Assert that hidden-service-related operations are not performed
17952 using single-hop circuits. Previously, Tor would assert that
17953 client-side streams are not attached to single-hop circuits,
17954 but not that other sensitive operations on the client and service
17955 side are not performed using single-hop circuits. Fixes bug 3332;
17957 - Avoid undefined behavior when parsing the list of supported
17958 rendezvous/introduction protocols in a hidden service descriptor.
17959 Previously, Tor would have confused (as-yet-unused) protocol version
17960 numbers greater than 32 with lower ones on many platforms. Fixes
17961 bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
17962 - Don't close hidden service client circuits which have almost
17963 finished connecting to their destination when they reach
17964 the normal circuit-build timeout. Previously, we would close
17965 introduction circuits which are waiting for an acknowledgement
17966 from the introduction point, and rendezvous circuits which have
17967 been specified in an INTRODUCE1 cell sent to a hidden service,
17968 after the normal CBT. Now, we mark them as 'timed out', and launch
17969 another rendezvous attempt in parallel. This behavior change can
17970 be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
17971 option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
17973 o Minor bugfixes (hidden services, service-side):
17974 - Don't close hidden-service-side rendezvous circuits when they
17975 reach the normal circuit-build timeout. This behavior change can
17976 be disabled using the new
17977 CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
17978 remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
17979 - Don't launch more than 10 service-side introduction-point circuits
17980 for a hidden service in five minutes. Previously, we would consider
17981 launching more introduction-point circuits if at least one second
17982 had passed without any introduction-point circuits failing. Fixes
17983 bug 4607; bugfix on 0.0.7pre1.
17985 o Minor bugfixes (config option behavior):
17986 - If the user tries to set MyFamily on a bridge, refuse to
17987 do so, and warn about the security implications. Fixes bug 4657;
17988 bugfix on 0.2.0.3-alpha.
17989 - The "--quiet" and "--hush" options now apply not only to Tor's
17990 behavior before logs are configured, but also to Tor's behavior in
17991 the absence of configured logs. Fixes bug 3550; bugfix on
17993 - Change the AllowDotExit rules so they should actually work.
17994 We now enforce AllowDotExit only immediately after receiving an
17995 address via SOCKS or DNSPort: other sources are free to provide
17996 .exit addresses after the resolution occurs. Fixes bug 3940;
17997 bugfix on 0.2.2.1-alpha.
17998 - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
17999 don't depend on the consensus parameters or compute adaptive
18000 timeouts when it is disabled. Fixes bug 5049; bugfix on
18002 - After we pick a directory mirror, we would refuse to use it if
18003 it's in our ExcludeExitNodes list, resulting in mysterious failures
18004 to bootstrap for people who just wanted to avoid exiting from
18005 certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
18006 - When told to add a bridge with the same digest as a preexisting
18007 bridge but a different addr:port, change the addr:port as
18008 requested. Previously we would not notice the change. Fixes half
18009 of bug 5603; fix on 0.2.2.26-beta.
18011 o Minor bugfixes (controller):
18012 - Allow manual 'authenticate' commands to the controller interface
18013 from netcat (nc) as well as telnet. We were rejecting them because
18014 they didn't come with the expected whitespace at the end of the
18015 command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
18016 - Report a real bootstrap problem to the controller on router
18017 identity mismatch. Previously we just said "foo", which probably
18018 made a lot of sense at the time. Fixes bug 4169; bugfix on
18020 - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
18021 option is set to 0 (which Vidalia version 0.2.16 now does when
18022 a SAVECONF attempt fails), perform other actions that SIGHUP
18023 usually causes (like reopening the logs). Fixes bug 5095; bugfix
18025 - Correctly handle checking the permissions on the parent
18026 directory of a control socket in the root directory. Bug found
18027 by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
18029 - End AUTHCHALLENGE error messages (in the control protocol) with
18030 a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
18032 o Minor bugfixes (network reading/writing):
18033 - Disable writing on marked-for-close connections when they are
18034 blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
18035 bug 5263; bugfix on 0.0.2pre13, where we first added a special
18036 case for flushing marked connections.
18037 - Make sure that there are no unhandled pending TLS errors before
18038 reading from a TLS stream. We had checks in 0.1.0.3-rc, but
18039 lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
18040 Bugfix on 0.1.0.5-rc; fixes bug 4528.
18041 - Detect SSL handshake even when the initial attempt to write the
18042 server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
18043 - If the client fails to set a reasonable set of ciphersuites
18044 during its v2 handshake renegotiation, allow the renegotiation to
18045 continue nevertheless (i.e. send all the required certificates).
18046 Fixes bug 4591; bugfix on 0.2.0.20-rc.
18048 o Minor bugfixes (other):
18049 - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
18050 resource exhaustion, so that clients can adjust their load to
18051 try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
18052 started using END_STREAM_REASON_RESOURCELIMIT.
18053 - Don't check for whether the address we're using for outbound
18054 connections has changed until after the outbound connection has
18055 completed. On Windows, getsockname() doesn't succeed until the
18056 connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
18057 - Don't hold a Windows file handle open for every file mapping;
18058 the file mapping handle is sufficient. Fixes bug 5951; bugfix on
18060 - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
18061 bugfix on 0.2.1.10-alpha.
18062 - If we fail to write a microdescriptor to the disk cache, do not
18063 continue replacing the old microdescriptor file. Fixes bug 2954;
18064 bugfix on 0.2.2.6-alpha.
18066 o Minor bugfixes (log messages, path selection):
18067 - Downgrade "set buildtimeout to low value" messages to "info"
18068 severity; they were never an actual problem, there was never
18069 anything reasonable to do about them, and they tended to spam logs
18070 from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
18071 - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
18072 more information to it, so that we can track it down in case it
18073 returns again. Mitigates bug 5235.
18074 - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
18075 options_validate(); warn if LearnCircuitBuildTimeout is disabled and
18076 CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
18077 - Issue a log message if a guard completes less than 40% of your
18078 circuits. Threshold is configurable by torrc option
18079 PathBiasNoticeRate and consensus parameter pb_noticepct. There is
18080 additional, off-by-default code to disable guards which fail too
18081 many circuits. Addresses ticket 5458.
18083 o Minor bugfixes (log messages, client):
18084 - Downgrade "Got a certificate, but we already have it" log messages
18085 from warning to info, except when we're a dirauth. Fixes bug 5238;
18086 bugfix on 0.2.1.7-alpha.
18087 - Fix the log message describing how we work around discovering
18088 that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
18089 4837; bugfix on 0.2.2.9-alpha.
18090 - When logging about a disallowed .exit name, do not also call it
18091 an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
18092 - Fix a log message suggesting that people contact a non-existent
18093 email address. Fixes bug 3448.
18094 - Rephrase the log message emitted if the TestSocks check is
18095 successful. Patch from Fabian Keil; fixes bug 4094.
18096 - Log (at debug level) whenever a circuit's purpose is changed.
18097 - Log SSL state transitions at log level DEBUG, log domain
18098 HANDSHAKE. This can be useful for debugging censorship events.
18099 Implements ticket 3264.
18100 - We now log which torrc file we're using on startup. Implements
18102 - Rate-limit log messages when asked to connect anonymously to
18103 a private address. When these hit, they tended to hit fast and
18104 often. Also, don't bother trying to connect to addresses that we
18105 are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
18106 reply makes us think we have been lied to, even when the address the
18107 client tried to connect to was "localhost." Resolves ticket 2822.
18109 o Minor bugfixes (log messages, non-client):
18110 - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
18111 Fixes bug 5932; bugfix on 0.2.2.7-alpha.
18112 - Don't log that we have "decided to publish new relay descriptor"
18113 unless we are actually publishing a descriptor. Fixes bug 3942;
18114 bugfix on 0.2.2.28-beta.
18115 - Log which authority we're missing votes from when we go to fetch
18116 them from the other auths.
18117 - Replace "Sending publish request" log messages with "Launching
18118 upload", so that they no longer confusingly imply that we're
18119 sending something to a directory we might not even be connected
18120 to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
18121 - Warn when Tor is configured to use accounting in a way that can
18122 link a hidden service to some other hidden service or public
18123 address. Resolves ticket 6490.
18124 - Fix a minor formatting issue in one of tor-gencert's error messages.
18128 - Update to the latest version of the tinytest unit testing framework.
18129 This includes a couple of bugfixes that can be relevant for
18130 running forked unit tests on Windows, and removes all reserved
18132 - Avoid a false positive in the util/threads unit test by increasing
18133 the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
18134 - Make it possible to set the TestingTorNetwork configuration
18135 option using AlternateDirAuthority and AlternateBridgeAuthority
18136 as an alternative to setting DirServer. Addresses ticket 6377.
18137 - Add a unit test for the environment_variable_names_equal() function.
18138 - A wide variety of new unit tests by Esteban Manchado Velázquez.
18139 - Numerous new unit tests for functions in util.c and address.c by
18141 - The long-disabled benchmark tests are now split into their own
18142 ./src/test/bench binary.
18143 - The benchmark tests can now use more accurate timers than
18144 gettimeofday() when such timers are available.
18145 - Use tt_assert(), not tor_assert(), for checking for test failures.
18146 This makes the unit tests more able to go on in the event that
18149 o Build improvements:
18150 - Use the dead_strip option when building Tor on OS X. This reduces
18151 binary size by almost 19% when linking openssl and libevent
18152 statically, which we do for Tor Browser Bundle.
18153 - Provide a better error message about possible OSX Asciidoc failure
18154 reasons. Fixes bug 6436.
18155 - Detect attempts to build Tor on (as yet hypothetical) versions
18156 of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
18157 fix for bug 4533. Bugfix on 0.2.2.28-beta.
18158 - On Windows, we now define the _WIN32_WINNT macros only if they
18159 are not already defined. This lets the person building Tor decide,
18160 if they want, to require a later version of Windows.
18161 - Our autogen.sh script now uses autoreconf to launch autoconf,
18162 automake, and so on. This is more robust against some of the failure
18163 modes associated with running the autotools pieces on their own.
18164 - Running "make version" now displays the version of Tor that
18165 we're about to build. Idea from katmagic; resolves issue 4400.
18166 - Make 'tor --digests' list hashes of all Tor source files. Bugfix
18167 on 0.2.2.4-alpha; fixes bug 3427.
18168 - New --enable-static-tor configure option for building Tor as
18169 statically as possible. Idea, general hackery and thoughts from
18170 Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
18172 - Limited, experimental support for building with nmake and MSVC.
18174 o Build requirements:
18175 - Building Tor with bufferevent support now requires Libevent
18176 2.0.13-stable or later. Previous versions of Libevent had bugs in
18177 SSL-related bufferevents and related issues that would make Tor
18178 work badly with bufferevents. Requiring 2.0.13-stable also allows
18179 Tor with bufferevents to take advantage of Libevent APIs
18180 introduced after 2.0.8-rc.
18181 - Our build system requires automake 1.6 or later to create the
18182 Makefile.in files. Previously, you could have used 1.4.
18183 This only affects developers and people building Tor from git;
18184 people who build Tor from the source distribution without changing
18185 the Makefile.am files should be fine.
18186 - Detect when we try to build on a platform that doesn't define
18187 AF_UNSPEC to 0. We don't work there, so refuse to compile.
18189 o Build fixes (compile/link):
18190 - Format more doubles with %f, not %lf. Patch from grarpamp to make
18191 Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
18193 - When building with --enable-static-tor on OpenBSD, do not
18194 erroneously attempt to link -lrt. Fixes bug 5103.
18195 - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
18196 that IPv6 stuff will compile on MSVC, and compilation issues
18197 will be easier to track down. Fixes bug 5861.
18198 - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
18199 Fixes bug 6379. Bugfix on 0.2.0.20-rc.
18200 - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
18201 Fixes bug 6097; bugfix on 0.2.2.16-alpha.
18203 o Build fixes (other):
18204 - Use the _WIN32 macro throughout our code to detect Windows.
18205 (Previously we had used the obsolete 'WIN32' and the idiosyncratic
18207 - Properly handle the case where the build-tree is not the same
18208 as the source tree when generating src/common/common_sha1.i,
18209 src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
18210 bugfix on 0.2.0.1-alpha.
18211 - During configure, search for library containing cos function as
18212 libm lives in libcore on some platforms (BeOS/Haiku). Linking
18213 against libm was hard-coded before. Fixes the first part of bug
18214 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
18216 - Prevent a false positive from the check-spaces script, by disabling
18217 the "whitespace between function name and (" check for functions
18220 o Packaging (RPM) changes:
18221 - Update our default RPM spec files to work with mock and rpmbuild
18222 on RHEL/Fedora. They have an updated set of dependencies and
18223 conflicts, a fix for an ancient typo when creating the "_tor"
18224 user, and better instructions. Thanks to Ondrej Mikle for the
18225 patch series. Fixes bug 6043.
18226 - On OpenSUSE, create the /var/run/tor directory on startup if it
18227 is not already created. Patch from Andreas Stieger. Fixes bug 2573.
18229 o Code refactoring (safety):
18230 - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
18231 10 lines. Also, don't nest them. Doing so in the past has
18232 led to hard-to-debug code. The new style is to use the
18233 SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
18234 - Use macros to indicate OpenSSL versions, so we don't need to worry
18235 about accidental hexadecimal bit shifts.
18236 - Use tor_sscanf() in place of scanf() in more places through the
18237 code. This makes us a little more locale-independent, and
18238 should help shut up code-analysis tools that can't tell
18239 a safe sscanf string from a dangerous one.
18240 - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
18241 - Use the smartlist_add_asprintf() alias more consistently.
18243 o Code refactoring (consolidate):
18244 - A major revision to our internal node-selecting and listing logic.
18245 Tor already had at least two major ways to look at the question of
18246 "which Tor servers do we know about": a list of router descriptors,
18247 and a list of entries in the current consensus. With
18248 microdescriptors, we're adding a third. Having so many systems
18249 without an abstraction layer over them was hurting the codebase.
18250 Now, we have a new "node_t" abstraction that presents a consistent
18251 interface to a client's view of a Tor node, and holds (nearly) all
18252 of the mutable state formerly in routerinfo_t and routerstatus_t.
18253 - Move tor_gettimeofday_cached() into compat_libevent.c, and use
18254 Libevent's notion of cached time when possible.
18255 - Remove duplicate code for invoking getrlimit() from control.c.
18256 - Use OpenSSL's built-in SSL_state_string_long() instead of our
18257 own homebrewed ssl_state_to_string() replacement. Patch from
18258 Emile Snyder. Fixes bug 4653.
18259 - Change the symmetric cipher interface so that creating and
18260 initializing a stream cipher are no longer separate functions.
18262 o Code refactoring (separate):
18263 - Make a new "entry connection" struct as an internal subtype of "edge
18264 connection", to simplify the code and make exit connections smaller.
18265 - Split connection_about_to_close() into separate functions for each
18267 - Rewrite the listener-selection logic so that parsing which ports
18268 we want to listen on is now separate from binding to the ports
18271 o Code refactoring (name changes):
18272 - Rename a handful of old identifiers, mostly related to crypto
18273 structures and crypto functions. By convention, our "create an
18274 object" functions are called "type_new()", our "free an object"
18275 functions are called "type_free()", and our types indicate that
18276 they are types only with a final "_t". But a handful of older
18277 types and functions broke these rules, with function names like
18278 "type_create" or "subsystem_op_type", or with type names like
18280 - Rename Tor functions that turn strings into addresses, so that
18281 "parse" indicates that no hostname resolution occurs, and
18282 "lookup" indicates that hostname resolution may occur. This
18283 should help prevent mistakes in the future. Fixes bug 3512.
18284 - Use the name "CERTS" consistently to refer to the new cell type;
18285 we were calling it CERT in some places and CERTS in others.
18286 - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
18287 invalid value, rather than just -1.
18288 - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
18289 can pick them up when the tests aren't disabled. Bugfix on
18290 0.2.2.4-alpha which introduced tinytest.
18292 o Code refactoring (other):
18293 - Defensively refactor rend_mid_rendezvous() so that protocol
18294 violations and length checks happen in the beginning. Fixes
18296 - Remove the pure attribute from all functions that used it
18297 previously. In many cases we assigned it incorrectly, because the
18298 functions might assert or call impure functions, and we don't have
18299 evidence that keeping the pure attribute is worthwhile. Implements
18300 changes suggested in ticket 4421.
18301 - Move the replay-detection cache for the RSA-encrypted parts of
18302 INTRODUCE2 cells to the introduction point data structures.
18303 Previously, we would use one replay-detection cache per hidden
18304 service. Required by fix for bug 3460.
18305 - The helper programs tor-gencert, tor-resolve, and tor-checkkey
18306 no longer link against Libevent: they never used it, but
18307 our library structure used to force them to link it.
18309 o Removed features and files:
18310 - Remove all internal support for unpadded RSA. We never used it, and
18311 it would be a bad idea to start.
18312 - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
18314 - Remove some redundant #include directives throughout the code.
18315 Patch from Andrea Gelmini.
18316 - Remove some old code to remember statistics about which descriptors
18317 we've served as a directory mirror. The feature wasn't used and
18318 is outdated now that microdescriptors are around.
18319 - Remove some old code to work around even older versions of Tor that
18320 used forked processes to handle DNS requests. Such versions of Tor
18321 are no longer in use as relays.
18322 - The "torify" script no longer supports the "tsocks" socksifier
18323 tool, since tsocks doesn't support DNS and UDP right for Tor.
18324 Everyone should be using torsocks instead. Fixes bugs 3530 and
18325 5180. Based on a patch by "ugh".
18326 - Remove the torrc.bridge file: we don't use it for anything, and
18327 it had become badly desynchronized from torrc.sample. Resolves
18331 - Begin a doc/state-contents.txt file to explain the contents of
18332 the Tor state file. Fixes bug 2987.
18333 - Clarify the documentation for the Alternate*Authority options.
18335 - Document the --defaults-torrc option, and the new semantics for
18336 overriding, extending, and clearing lists of options. Closes
18338 - Add missing man page documentation for consensus and microdesc
18339 files. Resolves ticket 6732.
18340 - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
18342 o Documentation fixes:
18343 - Improve the manual's documentation for the NT Service command-line
18344 options. Addresses ticket 3964.
18345 - Clarify SessionGroup documentation slightly; resolves ticket 5437.
18346 - Document the changes to the ORPort and DirPort options, and the
18347 fact that {OR/Dir}ListenAddress is now unnecessary (and
18348 therefore deprecated). Resolves ticket 5597.
18349 - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
18350 - Clarify that hidden services are TCP only. Fixes bug 6024.
18353 Changes in version 0.2.2.39 - 2012-09-11
18354 Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
18358 - Fix an assertion failure in tor_timegm() that could be triggered
18359 by a badly formatted directory object. Bug found by fuzzing with
18360 Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
18361 - Do not crash when comparing an address with port value 0 to an
18362 address policy. This bug could have been used to cause a remote
18363 assertion failure by or against directory authorities, or to
18364 allow some applications to crash clients. Fixes bug 6690; bugfix
18368 Changes in version 0.2.2.38 - 2012-08-12
18369 Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
18370 attack that could in theory leak path information.
18373 - Avoid an uninitialized memory read when reading a vote or consensus
18374 document that has an unrecognized flavor name. This read could
18375 lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
18376 - Try to leak less information about what relays a client is
18377 choosing to a side-channel attacker. Previously, a Tor client would
18378 stop iterating through the list of available relays as soon as it
18379 had chosen one, thus finishing a little earlier when it picked
18380 a router earlier in the list. If an attacker can recover this
18381 timing information (nontrivial but not proven to be impossible),
18382 they could learn some coarse-grained information about which relays
18383 a client was picking (middle nodes in particular are likelier to
18384 be affected than exits). The timing attack might be mitigated by
18385 other factors (see bug 6537 for some discussion), but it's best
18386 not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
18389 Changes in version 0.2.2.37 - 2012-06-06
18390 Tor 0.2.2.37 introduces a workaround for a critical renegotiation
18391 bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
18395 - Work around a bug in OpenSSL that broke renegotiation with TLS
18396 1.1 and TLS 1.2. Without this workaround, all attempts to speak
18397 the v2 Tor connection protocol when both sides were using OpenSSL
18398 1.0.1 would fail. Resolves ticket 6033.
18399 - When waiting for a client to renegotiate, don't allow it to add
18400 any bytes to the input buffer. This fixes a potential DoS issue.
18401 Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
18402 - Fix an edge case where if we fetch or publish a hidden service
18403 descriptor, we might build a 4-hop circuit and then use that circuit
18404 for exiting afterwards -- even if the new last hop doesn't obey our
18405 ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
18408 - Fix a build warning with Clang 3.1 related to our use of vasprintf.
18409 Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
18412 - Tell GCC and Clang to check for any errors in format strings passed
18413 to the tor_v*(print|scan)f functions.
18416 Changes in version 0.2.2.36 - 2012-05-24
18417 Tor 0.2.2.36 updates the addresses for two of the eight directory
18418 authorities, fixes some potential anonymity and security issues,
18419 and fixes several crash bugs.
18421 Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
18422 known flaws, and nobody should be using them. You should upgrade. If
18423 you're using a Linux or BSD and its packages are obsolete, stop using
18424 those packages and upgrade anyway.
18426 o Directory authority changes:
18427 - Change IP address for maatuska (v3 directory authority).
18428 - Change IP address for ides (v3 directory authority), and rename
18432 - When building or running with any version of OpenSSL earlier
18433 than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
18434 versions have a bug (CVE-2011-4576) in which their block cipher
18435 padding includes uninitialized data, potentially leaking sensitive
18436 information to any peer with whom they make a SSLv3 connection. Tor
18437 does not use SSL v3 by default, but a hostile client or server
18438 could force an SSLv3 connection in order to gain information that
18439 they shouldn't have been able to get. The best solution here is to
18440 upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
18441 or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
18442 to make sure that the bug can't happen.
18443 - Never use a bridge or a controller-supplied node as an exit, even
18444 if its exit policy allows it. Found by wanoskarnet. Fixes bug
18445 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
18446 and 0.2.0.3-alpha (for bridge-purpose descriptors).
18447 - Only build circuits if we have a sufficient threshold of the total
18448 descriptors that are marked in the consensus with the "Exit"
18449 flag. This mitigates an attack proposed by wanoskarnet, in which
18450 all of a client's bridges collude to restrict the exit nodes that
18451 the client knows about. Fixes bug 5343.
18452 - Provide controllers with a safer way to implement the cookie
18453 authentication mechanism. With the old method, if another locally
18454 running program could convince a controller that it was the Tor
18455 process, then that program could trick the controller into telling
18456 it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
18457 authentication method uses a challenge-response approach to prevent
18458 this attack. Fixes bug 5185; implements proposal 193.
18461 - Avoid logging uninitialized data when unable to decode a hidden
18462 service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
18463 - Avoid a client-side assertion failure when receiving an INTRODUCE2
18464 cell on a general purpose circuit. Fixes bug 5644; bugfix on
18466 - Fix builds when the path to sed, openssl, or sha1sum contains
18467 spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
18469 - Correct our replacements for the timeradd() and timersub() functions
18470 on platforms that lack them (for example, Windows). The timersub()
18471 function is used when expiring circuits, while timeradd() is
18472 currently unused. Bug report and patch by Vektor. Fixes bug 4778;
18473 bugfix on 0.2.2.24-alpha.
18474 - Fix the SOCKET_OK test that we use to tell when socket
18475 creation fails so that it works on Win64. Fixes part of bug 4533;
18476 bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
18479 - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
18480 Fixes bug 5346; bugfix on 0.0.8pre3.
18481 - Make our number-parsing functions always treat too-large values
18482 as an error, even when those values exceed the width of the
18483 underlying type. Previously, if the caller provided these
18484 functions with minima or maxima set to the extreme values of the
18485 underlying integer type, these functions would return those
18486 values on overflow rather than treating overflow as an error.
18487 Fixes part of bug 5786; bugfix on 0.0.9.
18488 - Older Linux kernels erroneously respond to strange nmap behavior
18489 by having accept() return successfully with a zero-length
18490 socket. When this happens, just close the connection. Previously,
18491 we would try harder to learn the remote address: but there was
18492 no such remote address to learn, and our method for trying to
18493 learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
18494 on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
18495 - Correct parsing of certain date types in parse_http_time().
18496 Without this patch, If-Modified-Since would behave
18497 incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
18498 Esteban Manchado Velázques.
18499 - Change the BridgePassword feature (part of the "bridge community"
18500 design, which is not yet implemented) to use a time-independent
18501 comparison. The old behavior might have allowed an adversary
18502 to use timing to guess the BridgePassword value. Fixes bug 5543;
18503 bugfix on 0.2.0.14-alpha.
18504 - Detect and reject certain misformed escape sequences in
18505 configuration values. Previously, these values would cause us
18506 to crash if received in a torrc file or over an authenticated
18507 control port. Bug found by Esteban Manchado Velázquez, and
18508 independently by Robert Connolly from Matta Consulting who further
18509 noted that it allows a post-authentication heap overflow. Patch
18510 by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
18511 bugfix on 0.2.0.16-alpha.
18512 - Fix a compile warning when using the --enable-openbsd-malloc
18513 configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
18514 - During configure, detect when we're building with clang version
18515 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
18516 CFLAGS. clang doesn't support them yet.
18517 - When sending an HTTP/1.1 proxy request, include a Host header.
18518 Fixes bug 5593; bugfix on 0.2.2.1-alpha.
18519 - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
18520 command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
18521 - If we hit the error case where routerlist_insert() replaces an
18522 existing (old) server descriptor, make sure to remove that
18523 server descriptor from the old_routers list. Fix related to bug
18524 1776. Bugfix on 0.2.2.18-alpha.
18526 o Minor bugfixes (documentation and log messages):
18527 - Fix a typo in a log message in rend_service_rendezvous_has_opened().
18528 Fixes bug 4856; bugfix on Tor 0.0.6.
18529 - Update "ClientOnly" man page entry to explain that there isn't
18530 really any point to messing with it. Resolves ticket 5005.
18531 - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
18532 directory authority option (introduced in Tor 0.2.2.34).
18533 - Downgrade the "We're missing a certificate" message from notice
18534 to info: people kept mistaking it for a real problem, whereas it
18535 is seldom the problem even when we are failing to bootstrap. Fixes
18536 bug 5067; bugfix on 0.2.0.10-alpha.
18537 - Correctly spell "connect" in a log message on failure to create a
18538 controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
18539 - Clarify the behavior of MaxCircuitDirtiness with hidden service
18540 circuits. Fixes issue 5259.
18543 - Directory authorities now reject versions of Tor older than
18544 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
18545 inclusive. These versions accounted for only a small fraction of
18546 the Tor network, and have numerous known security issues. Resolves
18548 - Update to the May 1 2012 Maxmind GeoLite Country database.
18551 - When sending or relaying a RELAY_EARLY cell, we used to convert
18552 it to a RELAY cell if the connection was using the v1 link
18553 protocol. This was a workaround for older versions of Tor, which
18554 didn't handle RELAY_EARLY cells properly. Now that all supported
18555 versions can handle RELAY_EARLY cells, and now that we're enforcing
18556 the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
18557 remove this workaround. Addresses bug 4786.
18560 Changes in version 0.2.2.35 - 2011-12-16
18561 Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
18562 buffers code. Absolutely everybody should upgrade.
18564 The bug relied on an incorrect calculation when making data continuous
18565 in one of our IO buffers, if the first chunk of the buffer was
18566 misaligned by just the wrong amount. The miscalculation would allow an
18567 attacker to overflow a piece of heap-allocated memory. To mount this
18568 attack, the attacker would need to either open a SOCKS connection to
18569 Tor's SocksPort (usually restricted to localhost), or target a Tor
18570 instance configured to make its connections through a SOCKS proxy
18571 (which Tor does not do by default).
18573 Good security practice requires that all heap-overflow bugs should be
18574 presumed to be exploitable until proven otherwise, so we are treating
18575 this as a potential code execution attack. Please upgrade immediately!
18576 This bug does not affect bufferevents-based builds of Tor. Special
18577 thanks to "Vektor" for reporting this issue to us!
18579 Tor 0.2.2.35 also fixes several bugs in previous versions, including
18580 crash bugs for unusual configurations, and a long-term bug that
18581 would prevent Tor from starting on Windows machines with draconian
18584 With this release, we remind everyone that 0.2.0.x has reached its
18585 formal end-of-life. Those Tor versions have many known flaws, and
18586 nobody should be using them. You should upgrade -- ideally to the
18587 0.2.2.x series. If you're using a Linux or BSD and its packages are
18588 obsolete, stop using those packages and upgrade anyway.
18590 The Tor 0.2.1.x series is also approaching its end-of-life: it will no
18591 longer receive support after some time in early 2012.
18594 - Fix a heap overflow bug that could occur when trying to pull
18595 data into the first chunk of a buffer, when that chunk had
18596 already had some data drained from it. Fixes CVE-2011-2778;
18597 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
18598 - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
18599 that it doesn't attempt to allocate a socketpair. This could cause
18600 some problems on Windows systems with overzealous firewalls. Fix for
18601 bug 4457; workaround for Libevent versions 2.0.1-alpha through
18603 - If we mark an OR connection for close based on a cell we process,
18604 don't process any further cells on it. We already avoid further
18605 reads on marked-for-close connections, but now we also discard the
18606 cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
18607 which was the first version where we might mark a connection for
18608 close based on processing a cell on it.
18609 - Correctly sanity-check that we don't underflow on a memory
18610 allocation (and then assert) for hidden service introduction
18611 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
18612 bugfix on 0.2.1.5-alpha.
18613 - Fix a memory leak when we check whether a hidden service
18614 descriptor has any usable introduction points left. Fixes bug
18615 4424. Bugfix on 0.2.2.25-alpha.
18616 - Don't crash when we're running as a relay and don't have a GeoIP
18617 file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
18618 we've had in the 0.2.3.x branch already.
18619 - When running as a client, do not print a misleading (and plain
18620 wrong) log message that we're collecting "directory request"
18621 statistics: clients don't collect statistics. Also don't create a
18622 useless (because empty) stats file in the stats/ directory. Fixes
18623 bug 4353; bugfix on 0.2.2.34.
18626 - Detect failure to initialize Libevent. This fix provides better
18627 detection for future instances of bug 4457.
18628 - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
18629 function. This was eating up hideously large amounts of time on some
18630 busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
18631 - Resolve an integer overflow bug in smartlist_ensure_capacity().
18632 Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
18634 - Don't warn about unused log_mutex in log.c when building with
18635 --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
18636 0.1.0.6-rc which introduced --disable-threads.
18637 - When configuring, starting, or stopping an NT service, stop
18638 immediately after the service configuration attempt has succeeded
18639 or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
18640 - When sending a NETINFO cell, include the original address
18641 received for the other side, not its canonical address. Found
18642 by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
18643 - Fix a typo in a hibernation-related log message. Fixes bug 4331;
18644 bugfix on 0.2.2.23-alpha; found by "tmpname0901".
18645 - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
18646 occurred when a client tried to fetch a descriptor for a bridge
18647 in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
18648 - Backport fixes for a pair of compilation warnings on Windows.
18649 Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
18650 - If we had ever tried to call tor_addr_to_str on an address of
18651 unknown type, we would have done a strdup on an uninitialized
18652 buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
18653 Reported by "troll_un".
18654 - Correctly detect and handle transient lookup failures from
18655 tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
18656 Reported by "troll_un".
18657 - Fix null-pointer access that could occur if TLS allocation failed.
18658 Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
18659 - Use tor_socket_t type for listener argument to accept(). Fixes bug
18660 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
18663 - Add two new config options for directory authorities:
18664 AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
18665 Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
18666 that is always sufficient to satisfy the bandwidth requirement for
18667 the Guard flag. Now it will be easier for researchers to simulate
18668 Tor networks with different values. Resolves ticket 4484.
18669 - When Tor ignores a hidden service specified in its configuration,
18670 include the hidden service's directory in the warning message.
18671 Previously, we would only tell the user that some hidden service
18672 was ignored. Bugfix on 0.0.6; fixes bug 4426.
18673 - Update to the December 6 2011 Maxmind GeoLite Country database.
18675 o Packaging changes:
18676 - Make it easier to automate expert package builds on Windows,
18677 by removing an absolute path from makensis.exe command.
18680 Changes in version 0.2.1.32 - 2011-12-16
18681 Tor 0.2.1.32 backports important security and privacy fixes for
18682 oldstable. This release is intended only for package maintainers and
18683 others who cannot use the 0.2.2 stable series. All others should be
18684 using Tor 0.2.2.x or newer.
18686 The Tor 0.2.1.x series will reach formal end-of-life some time in
18687 early 2012; we will stop releasing patches for it then.
18689 o Major bugfixes (also included in 0.2.2.x):
18690 - Correctly sanity-check that we don't underflow on a memory
18691 allocation (and then assert) for hidden service introduction
18692 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
18693 bugfix on 0.2.1.5-alpha.
18694 - Fix a heap overflow bug that could occur when trying to pull
18695 data into the first chunk of a buffer, when that chunk had
18696 already had some data drained from it. Fixes CVE-2011-2778;
18697 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
18700 - Update to the December 6 2011 Maxmind GeoLite Country database.
18703 Changes in version 0.2.2.34 - 2011-10-26
18704 Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
18705 can deanonymize Tor users. Everybody should upgrade.
18707 The attack relies on four components: 1) Clients reuse their TLS cert
18708 when talking to different relays, so relays can recognize a user by
18709 the identity key in her cert. 2) An attacker who knows the client's
18710 identity key can probe each guard relay to see if that identity key
18711 is connected to that guard relay right now. 3) A variety of active
18712 attacks in the literature (starting from "Low-Cost Traffic Analysis
18713 of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
18714 discover the guard relays that a Tor user visiting the website is using.
18715 4) Clients typically pick three guards at random, so the set of guards
18716 for a given user could well be a unique fingerprint for her. This
18717 release fixes components #1 and #2, which is enough to block the attack;
18718 the other two remain as open research problems. Special thanks to
18719 "frosty_un" for reporting the issue to us!
18721 Clients should upgrade so they are no longer recognizable by the TLS
18722 certs they present. Relays should upgrade so they no longer allow a
18723 remote attacker to probe them to test whether unpatched clients are
18724 currently connected to them.
18726 This release also fixes several vulnerabilities that allow an attacker
18727 to enumerate bridge relays. Some bridge enumeration attacks still
18728 remain; see for example proposal 188.
18730 o Privacy/anonymity fixes (clients):
18731 - Clients and bridges no longer send TLS certificate chains on
18732 outgoing OR connections. Previously, each client or bridge would
18733 use the same cert chain for all outgoing OR connections until
18734 its IP address changes, which allowed any relay that the client
18735 or bridge contacted to determine which entry guards it is using.
18736 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
18737 - If a relay receives a CREATE_FAST cell on a TLS connection, it
18738 no longer considers that connection as suitable for satisfying a
18739 circuit EXTEND request. Now relays can protect clients from the
18740 CVE-2011-2768 issue even if the clients haven't upgraded yet.
18741 - Directory authorities no longer assign the Guard flag to relays
18742 that haven't upgraded to the above "refuse EXTEND requests
18743 to client connections" fix. Now directory authorities can
18744 protect clients from the CVE-2011-2768 issue even if neither
18745 the clients nor the relays have upgraded yet. There's a new
18746 "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
18747 to let us transition smoothly, else tomorrow there would be no
18750 o Privacy/anonymity fixes (bridge enumeration):
18751 - Bridge relays now do their directory fetches inside Tor TLS
18752 connections, like all the other clients do, rather than connecting
18753 directly to the DirPort like public relays do. Removes another
18754 avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
18755 - Bridges relays now build circuits for themselves in a more similar
18756 way to how clients build them. Removes another avenue for
18757 enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
18758 when bridges were introduced.
18759 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
18760 that they initiated. Relays could distinguish incoming bridge
18761 connections from client connections, creating another avenue for
18762 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
18763 Found by "frosty_un".
18766 - Fix a crash bug when changing node restrictions while a DNS lookup
18767 is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
18769 - Don't launch a useless circuit after failing to use one of a
18770 hidden service's introduction points. Previously, we would
18771 launch a new introduction circuit, but not set the hidden service
18772 which that circuit was intended to connect to, so it would never
18773 actually be used. A different piece of code would then create a
18774 new introduction circuit correctly. Bug reported by katmagic and
18775 found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
18778 - Change an integer overflow check in the OpenBSD_Malloc code so
18779 that GCC is less likely to eliminate it as impossible. Patch
18780 from Mansour Moufid. Fixes bug 4059.
18781 - When a hidden service turns an extra service-side introduction
18782 circuit into a general-purpose circuit, free the rend_data and
18783 intro_key fields first, so we won't leak memory if the circuit
18784 is cannibalized for use as another service-side introduction
18785 circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
18786 - Bridges now skip DNS self-tests, to act a little more stealthily.
18787 Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
18788 bridges. Patch by "warms0x".
18789 - Fix internal bug-checking logic that was supposed to catch
18790 failures in digest generation so that it will fail more robustly
18791 if we ask for a nonexistent algorithm. Found by Coverity Scan.
18792 Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
18793 - Report any failure in init_keys() calls launched because our
18794 IP address has changed. Spotted by Coverity Scan. Bugfix on
18795 0.1.1.4-alpha; fixes CID 484.
18797 o Minor bugfixes (log messages and documentation):
18798 - Remove a confusing dollar sign from the example fingerprint in the
18799 man page, and also make the example fingerprint a valid one. Fixes
18800 bug 4309; bugfix on 0.2.1.3-alpha.
18801 - The next version of Windows will be called Windows 8, and it has
18802 a major version of 6, minor version of 2. Correctly identify that
18803 version instead of calling it "Very recent version". Resolves
18804 ticket 4153; reported by funkstar.
18805 - Downgrade log messages about circuit timeout calibration from
18806 "notice" to "info": they don't require or suggest any human
18807 intervention. Patch from Tom Lowenthal. Fixes bug 4063;
18808 bugfix on 0.2.2.14-alpha.
18811 - Turn on directory request statistics by default and include them in
18812 extra-info descriptors. Don't break if we have no GeoIP database.
18813 Backported from 0.2.3.1-alpha; implements ticket 3951.
18814 - Update to the October 4 2011 Maxmind GeoLite Country database.
18817 Changes in version 0.2.1.31 - 2011-10-26
18818 Tor 0.2.1.31 backports important security and privacy fixes for
18819 oldstable. This release is intended only for package maintainers and
18820 others who cannot use the 0.2.2 stable series. All others should be
18821 using Tor 0.2.2.x or newer.
18823 o Security fixes (also included in 0.2.2.x):
18824 - Replace all potentially sensitive memory comparison operations
18825 with versions whose runtime does not depend on the data being
18826 compared. This will help resist a class of attacks where an
18827 adversary can use variations in timing information to learn
18828 sensitive data. Fix for one case of bug 3122. (Safe memcmp
18829 implementation by Robert Ransom based partially on code by DJB.)
18830 - Fix an assert in parsing router descriptors containing IPv6
18831 addresses. This one took down the directory authorities when
18832 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
18834 o Privacy/anonymity fixes (also included in 0.2.2.x):
18835 - Clients and bridges no longer send TLS certificate chains on
18836 outgoing OR connections. Previously, each client or bridge would
18837 use the same cert chain for all outgoing OR connections until
18838 its IP address changes, which allowed any relay that the client
18839 or bridge contacted to determine which entry guards it is using.
18840 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
18841 - If a relay receives a CREATE_FAST cell on a TLS connection, it
18842 no longer considers that connection as suitable for satisfying a
18843 circuit EXTEND request. Now relays can protect clients from the
18844 CVE-2011-2768 issue even if the clients haven't upgraded yet.
18845 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
18846 that they initiated. Relays could distinguish incoming bridge
18847 connections from client connections, creating another avenue for
18848 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
18849 Found by "frosty_un".
18850 - When receiving a hidden service descriptor, check that it is for
18851 the hidden service we wanted. Previously, Tor would store any
18852 hidden service descriptors that a directory gave it, whether it
18853 wanted them or not. This wouldn't have let an attacker impersonate
18854 a hidden service, but it did let directories pre-seed a client
18855 with descriptors that it didn't want. Bugfix on 0.0.6.
18856 - Avoid linkability based on cached hidden service descriptors: forget
18857 all hidden service descriptors cached as a client when processing a
18858 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
18859 - Make the bridge directory authority refuse to answer directory
18860 requests for "all" descriptors. It used to include bridge
18861 descriptors in its answer, which was a major information leak.
18862 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
18863 - Don't attach new streams to old rendezvous circuits after SIGNAL
18864 NEWNYM. Previously, we would keep using an existing rendezvous
18865 circuit if it remained open (i.e. if it were kept open by a
18866 long-lived stream, or if a new stream were attached to it before
18867 Tor could notice that it was old and no longer in use). Bugfix on
18868 0.1.1.15-rc; fixes bug 3375.
18870 o Minor bugfixes (also included in 0.2.2.x):
18871 - When we restart our relay, we might get a successful connection
18872 from the outside before we've started our reachability tests,
18873 triggering a warning: "ORPort found reachable, but I have no
18874 routerinfo yet. Failing to inform controller of success." This
18875 bug was harmless unless Tor is running under a controller
18876 like Vidalia, in which case the controller would never get a
18877 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
18879 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
18880 enabled. Fixes bug 1526.
18881 - Remove undocumented option "-F" from tor-resolve: it hasn't done
18882 anything since 0.2.1.16-rc.
18883 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
18884 None of the cases where we did this before were wrong, but by making
18885 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
18886 - Fix a rare crash bug that could occur when a client was configured
18887 with a large number of bridges. Fixes bug 2629; bugfix on
18888 0.2.1.2-alpha. Bugfix by trac user "shitlei".
18889 - Correct the warning displayed when a rendezvous descriptor exceeds
18890 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
18892 - Fix an uncommon assertion failure when running with DNSPort under
18893 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
18894 - When warning about missing zlib development packages during compile,
18895 give the correct package names. Bugfix on 0.2.0.1-alpha.
18896 - Require that introduction point keys and onion keys have public
18897 exponent 65537. Bugfix on 0.2.0.10-alpha.
18898 - Do not crash when our configuration file becomes unreadable, for
18899 example due to a permissions change, between when we start up
18900 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
18902 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
18904 - Always NUL-terminate the sun_path field of a sockaddr_un before
18905 passing it to the kernel. (Not a security issue: kernels are
18906 smart enough to reject bad sockaddr_uns.) Found by Coverity;
18907 CID #428. Bugfix on Tor 0.2.0.3-alpha.
18908 - Don't stack-allocate the list of supplementary GIDs when we're
18909 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
18910 could take up to 256K, which is way too much stack. Found by
18911 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
18913 o Minor bugfixes (only in 0.2.1.x):
18914 - Resume using micro-version numbers in 0.2.1.x: our Debian packages
18915 rely on them. Bugfix on 0.2.1.30.
18916 - Use git revisions instead of svn revisions when generating our
18917 micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
18919 o Minor features (also included in 0.2.2.x):
18920 - Adjust the expiration time on our SSL session certificates to
18921 better match SSL certs seen in the wild. Resolves ticket 4014.
18922 - Allow nameservers with IPv6 address. Resolves bug 2574.
18923 - Update to the October 4 2011 Maxmind GeoLite Country database.
18926 Changes in version 0.2.2.33 - 2011-09-13
18927 Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
18928 TLS handshake that makes relays and bridges that run this new version
18929 reachable from Iran again.
18932 - Avoid an assertion failure when reloading a configuration with
18933 TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
18934 3923; bugfix on 0.2.2.25-alpha.
18936 o Minor features (security):
18937 - Check for replays of the public-key encrypted portion of an
18938 INTRODUCE1 cell, in addition to the current check for replays of
18939 the g^x value. This prevents a possible class of active attacks
18940 by an attacker who controls both an introduction point and a
18941 rendezvous point, and who uses the malleability of AES-CTR to
18942 alter the encrypted g^x portion of the INTRODUCE1 cell. We think
18943 that these attacks are infeasible (requiring the attacker to send
18944 on the order of zettabytes of altered cells in a short interval),
18945 but we'd rather block them off in case there are any classes of
18946 this attack that we missed. Reported by Willem Pinckaers.
18949 - Adjust the expiration time on our SSL session certificates to
18950 better match SSL certs seen in the wild. Resolves ticket 4014.
18951 - Change the default required uptime for a relay to be accepted as
18952 a HSDir (hidden service directory) from 24 hours to 25 hours.
18953 Improves on 0.2.0.10-alpha; resolves ticket 2649.
18954 - Add a VoteOnHidServDirectoriesV2 config option to allow directory
18955 authorities to abstain from voting on assignment of the HSDir
18956 consensus flag. Related to bug 2649.
18957 - Update to the September 6 2011 Maxmind GeoLite Country database.
18959 o Minor bugfixes (documentation and log messages):
18960 - Correct the man page to explain that HashedControlPassword and
18961 CookieAuthentication can both be set, in which case either method
18962 is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
18963 when we decided to allow these config options to both be set. Issue
18964 raised by bug 3898.
18965 - Demote the 'replay detected' log message emitted when a hidden
18966 service receives the same Diffie-Hellman public key in two different
18967 INTRODUCE2 cells to info level. A normal Tor client can cause that
18968 log message during its normal operation. Bugfix on 0.2.1.6-alpha;
18969 fixes part of bug 2442.
18970 - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
18971 level. There is nothing that a hidden service's operator can do
18972 to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
18974 - Clarify a log message specifying the characters permitted in
18975 HiddenServiceAuthorizeClient client names. Previously, the log
18976 message said that "[A-Za-z0-9+-_]" were permitted; that could have
18977 given the impression that every ASCII character between "+" and "_"
18978 was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
18981 - Provide a substitute implementation of lround() for MSVC, which
18982 apparently lacks it. Patch from Gisle Vanem.
18983 - Clean up some code issues that prevented Tor from building on older
18984 BSDs. Fixes bug 3894; reported by "grarpamp".
18985 - Search for a platform-specific version of "ar" when cross-compiling.
18986 Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
18989 Changes in version 0.2.2.32 - 2011-08-27
18990 The Tor 0.2.2 release series is dedicated to the memory of Andreas
18991 Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
18992 a founder of the PETS community, a leader in our field, a mentor,
18993 and a friend. He left us with these words: "I had the possibility
18994 to contribute to this world that is not as it should be. I hope I
18995 could help in some areas to make the world a better place, and that
18996 I could also encourage other people to be engaged in improving the
18997 world. Please, stay engaged. This world needs you, your love, your
18998 initiative -- now I cannot be part of that anymore."
19000 Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
19001 ready. More than two years in the making, this release features improved
19002 client performance and hidden service reliability, better compatibility
19003 for Android, correct behavior for bridges that listen on more than
19004 one address, more extensible and flexible directory object handling,
19005 better reporting of network statistics, improved code security, and
19006 many many other features and bugfixes.
19008 o Major features (client performance):
19009 - When choosing which cells to relay first, relays now favor circuits
19010 that have been quiet recently, to provide lower latency for
19011 low-volume circuits. By default, relays enable or disable this
19012 feature based on a setting in the consensus. They can override
19013 this default by using the new "CircuitPriorityHalflife" config
19014 option. Design and code by Ian Goldberg, Can Tang, and Chris
19016 - Directory authorities now compute consensus weightings that instruct
19017 clients how to weight relays flagged as Guard, Exit, Guard+Exit,
19018 and no flag. Clients use these weightings to distribute network load
19019 more evenly across these different relay types. The weightings are
19020 in the consensus so we can change them globally in the future. Extra
19021 thanks to "outofwords" for finding some nasty security bugs in
19022 the first implementation of this feature.
19024 o Major features (client performance, circuit build timeout):
19025 - Tor now tracks how long it takes to build client-side circuits
19026 over time, and adapts its timeout to local network performance.
19027 Since a circuit that takes a long time to build will also provide
19028 bad performance, we get significant latency improvements by
19029 discarding the slowest 20% of circuits. Specifically, Tor creates
19030 circuits more aggressively than usual until it has enough data
19031 points for a good timeout estimate. Implements proposal 151.
19032 - Circuit build timeout constants can be controlled by consensus
19033 parameters. We set good defaults for these parameters based on
19034 experimentation on broadband and simulated high-latency links.
19035 - Circuit build time learning can be disabled via consensus parameter
19036 or by the client via a LearnCircuitBuildTimeout config option. We
19037 also automatically disable circuit build time calculation if either
19038 AuthoritativeDirectory is set, or if we fail to write our state
19039 file. Implements ticket 1296.
19041 o Major features (relays use their capacity better):
19042 - Set SO_REUSEADDR socket option on all sockets, not just
19043 listeners. This should help busy exit nodes avoid running out of
19044 useable ports just because all the ports have been used in the
19045 near past. Resolves issue 2850.
19046 - Relays now save observed peak bandwidth throughput rates to their
19047 state file (along with total usage, which was already saved),
19048 so that they can determine their correct estimated bandwidth on
19049 restart. Resolves bug 1863, where Tor relays would reset their
19050 estimated bandwidth to 0 after restarting.
19051 - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
19052 should give us approximately 40-50% more Guard-flagged nodes,
19053 improving the anonymity the Tor network can provide and also
19054 decreasing the dropoff in throughput that relays experience when
19055 they first get the Guard flag.
19056 - Directory authorities now take changes in router IP address and
19057 ORPort into account when determining router stability. Previously,
19058 if a router changed its IP or ORPort, the authorities would not
19059 treat it as having any downtime for the purposes of stability
19060 calculation, whereas clients would experience downtime since the
19061 change would take a while to propagate to them. Resolves issue 1035.
19062 - New AccelName and AccelDir options add support for dynamic OpenSSL
19063 hardware crypto acceleration engines.
19065 o Major features (relays control their load better):
19066 - Exit relays now try harder to block exit attempts from unknown
19067 relays, to make it harder for people to use them as one-hop proxies
19068 a la tortunnel. Controlled by the refuseunknownexits consensus
19069 parameter (currently enabled), or you can override it on your
19070 relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
19071 based on a variant of proposal 163.
19072 - Add separate per-conn write limiting to go with the per-conn read
19073 limiting. We added a global write limit in Tor 0.1.2.5-alpha,
19074 but never per-conn write limits.
19075 - New consensus params "bwconnrate" and "bwconnburst" to let us
19076 rate-limit client connections as they enter the network. It's
19077 controlled in the consensus so we can turn it on and off for
19078 experiments. It's starting out off. Based on proposal 163.
19080 o Major features (controllers):
19081 - Export GeoIP information on bridge usage to controllers even if we
19082 have not yet been running for 24 hours. Now Vidalia bridge operators
19083 can get more accurate and immediate feedback about their
19084 contributions to the network.
19085 - Add an __OwningControllerProcess configuration option and a
19086 TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
19087 that when it exits, Tor will shut down. Implements feature 3049.
19089 o Major features (directory authorities):
19090 - Directory authorities now create, vote on, and serve multiple
19091 parallel formats of directory data as part of their voting process.
19092 Partially implements Proposal 162: "Publish the consensus in
19094 - Directory authorities now agree on and publish small summaries
19095 of router information that clients can use in place of regular
19096 server descriptors. This transition will allow Tor 0.2.3 clients
19097 to use far less bandwidth for downloading information about the
19098 network. Begins the implementation of Proposal 158: "Clients
19099 download consensus + microdescriptors".
19100 - The directory voting system is now extensible to use multiple hash
19101 algorithms for signatures and resource selection. Newer formats
19102 are signed with SHA256, with a possibility for moving to a better
19103 hash algorithm in the future.
19104 - Directory authorities can now vote on arbitrary integer values as
19105 part of the consensus process. This is designed to help set
19106 network-wide parameters. Implements proposal 167.
19108 o Major features and bugfixes (node selection):
19109 - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
19110 ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
19111 options. Previously, we had been ambiguous in describing what
19112 counted as an "exit" node, and what operations exactly "StrictNodes
19113 0" would permit. This created confusion when people saw nodes built
19114 through unexpected circuits, and made it hard to tell real bugs from
19115 surprises. Now the intended behavior is:
19116 . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
19117 a node that delivers user traffic outside the Tor network.
19118 . "Entry", in the context of EntryNodes, means a node used as the
19119 first hop of a multihop circuit. It doesn't include direct
19120 connections to directory servers.
19121 . "ExcludeNodes" applies to all nodes.
19122 . "StrictNodes" changes the behavior of ExcludeNodes only. When
19123 StrictNodes is set, Tor should avoid all nodes listed in
19124 ExcludeNodes, even when it will make user requests fail. When
19125 StrictNodes is *not* set, then Tor should follow ExcludeNodes
19126 whenever it can, except when it must use an excluded node to
19127 perform self-tests, connect to a hidden service, provide a
19128 hidden service, fulfill a .exit request, upload directory
19129 information, or fetch directory information.
19130 Collectively, the changes to implement the behavior fix bug 1090.
19131 - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
19132 change during a config reload, mark and discard all our origin
19133 circuits. This fix should address edge cases where we change the
19134 config options and but then choose a circuit that we created before
19136 - Make EntryNodes config option much more aggressive even when
19137 StrictNodes is not set. Before it would prepend your requested
19138 entrynodes to your list of guard nodes, but feel free to use others
19139 after that. Now it chooses only from your EntryNodes if any of
19140 those are available, and only falls back to others if a) they're
19141 all down and b) StrictNodes is not set.
19142 - Now we refresh your entry guards from EntryNodes at each consensus
19143 fetch -- rather than just at startup and then they slowly rot as
19144 the network changes.
19145 - Add support for the country code "{??}" in torrc options like
19146 ExcludeNodes, to indicate all routers of unknown country. Closes
19148 - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
19149 a node is listed in both, it's treated as excluded.
19150 - ExcludeNodes now applies to directory nodes -- as a preference if
19151 StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
19152 Don't exclude all the directory authorities and set StrictNodes to 1
19153 unless you really want your Tor to break.
19154 - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
19155 - ExcludeExitNodes now overrides .exit requests.
19156 - We don't use bridges listed in ExcludeNodes.
19157 - When StrictNodes is 1:
19158 . We now apply ExcludeNodes to hidden service introduction points
19159 and to rendezvous points selected by hidden service users. This
19160 can make your hidden service less reliable: use it with caution!
19161 . If we have used ExcludeNodes on ourself, do not try relay
19162 reachability self-tests.
19163 . If we have excluded all the directory authorities, we will not
19164 even try to upload our descriptor if we're a relay.
19165 . Do not honor .exit requests to an excluded node.
19166 - When the set of permitted nodes changes, we now remove any mappings
19167 introduced via TrackExitHosts to now-excluded nodes. Bugfix on
19169 - We never cannibalize a circuit that had excluded nodes on it, even
19170 if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
19171 - Improve log messages related to excluded nodes.
19173 o Major features (misc):
19174 - Numerous changes, bugfixes, and workarounds from Nathan Freitas
19175 to help Tor build correctly for Android phones.
19176 - The options SocksPort, ControlPort, and so on now all accept a
19177 value "auto" that opens a socket on an OS-selected port. A
19178 new ControlPortWriteToFile option tells Tor to write its
19179 actual control port or ports to a chosen file. If the option
19180 ControlPortFileGroupReadable is set, the file is created as
19181 group-readable. Now users can run two Tor clients on the same
19182 system without needing to manually mess with parameters. Resolves
19183 part of ticket 3076.
19184 - Tor now supports tunneling all of its outgoing connections over
19185 a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
19186 configuration options. Code by Christopher Davis.
19188 o Code security improvements:
19189 - Replace all potentially sensitive memory comparison operations
19190 with versions whose runtime does not depend on the data being
19191 compared. This will help resist a class of attacks where an
19192 adversary can use variations in timing information to learn
19193 sensitive data. Fix for one case of bug 3122. (Safe memcmp
19194 implementation by Robert Ransom based partially on code by DJB.)
19195 - Enable Address Space Layout Randomization (ASLR) and Data Execution
19196 Prevention (DEP) by default on Windows to make it harder for
19197 attackers to exploit vulnerabilities. Patch from John Brooks.
19198 - New "--enable-gcc-hardening" ./configure flag (off by default)
19199 to turn on gcc compile time hardening options. It ensures
19200 that signed ints have defined behavior (-fwrapv), enables
19201 -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
19202 with canaries (-fstack-protector-all), turns on ASLR protection if
19203 supported by the kernel (-fPIE, -pie), and adds additional security
19204 related warnings. Verified to work on Mac OS X and Debian Lenny.
19205 - New "--enable-linker-hardening" ./configure flag (off by default)
19206 to turn on ELF specific hardening features (relro, now). This does
19207 not work with Mac OS X or any other non-ELF binary format.
19208 - Always search the Windows system directory for system DLLs, and
19209 nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
19210 - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
19211 current and future memory pages via mlockall(). On supported
19212 platforms (modern Linux and probably BSD but not Windows or OS X),
19213 this should effectively disable any and all attempts to page out
19214 memory. This option requires that you start your Tor as root --
19215 if you use DisableAllSwap, please consider using the User option
19216 to properly reduce the privileges of your Tor.
19218 o Major bugfixes (crashes):
19219 - Fix crash bug on platforms where gmtime and localtime can return
19220 NULL. Windows 7 users were running into this one. Fixes part of bug
19221 2077. Bugfix on all versions of Tor. Found by boboper.
19222 - Introduce minimum/maximum values that clients will believe
19223 from the consensus. Now we'll have a better chance to avoid crashes
19224 or worse when a consensus param has a weird value.
19225 - Fix a rare crash bug that could occur when a client was configured
19226 with a large number of bridges. Fixes bug 2629; bugfix on
19227 0.2.1.2-alpha. Bugfix by trac user "shitlei".
19228 - Do not crash when our configuration file becomes unreadable, for
19229 example due to a permissions change, between when we start up
19230 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
19232 - If we're in the pathological case where there's no exit bandwidth
19233 but there is non-exit bandwidth, or no guard bandwidth but there
19234 is non-guard bandwidth, don't crash during path selection. Bugfix
19236 - Fix a crash bug when trying to initialize the evdns module in
19237 Libevent 2. Bugfix on 0.2.1.16-rc.
19239 o Major bugfixes (stability):
19240 - Fix an assert in parsing router descriptors containing IPv6
19241 addresses. This one took down the directory authorities when
19242 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
19243 - Fix an uncommon assertion failure when running with DNSPort under
19244 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
19245 - Treat an unset $HOME like an empty $HOME rather than triggering an
19246 assert. Bugfix on 0.0.8pre1; fixes bug 1522.
19247 - More gracefully handle corrupt state files, removing asserts
19248 in favor of saving a backup and resetting state.
19249 - Instead of giving an assertion failure on an internal mismatch
19250 on estimated freelist size, just log a BUG warning and try later.
19251 Mitigates but does not fix bug 1125.
19252 - Fix an assert that got triggered when using the TestingTorNetwork
19253 configuration option and then issuing a GETINFO config-text control
19254 command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
19255 - If the cached cert file is unparseable, warn but don't exit.
19257 o Privacy fixes (relays/bridges):
19258 - Don't list Windows capabilities in relay descriptors. We never made
19259 use of them, and maybe it's a bad idea to publish them. Bugfix
19261 - If the Nickname configuration option isn't given, Tor would pick a
19262 nickname based on the local hostname as the nickname for a relay.
19263 Because nicknames are not very important in today's Tor and the
19264 "Unnamed" nickname has been implemented, this is now problematic
19265 behavior: It leaks information about the hostname without being
19266 useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
19267 introduced the Unnamed nickname. Reported by tagnaq.
19268 - Maintain separate TLS contexts and certificates for incoming and
19269 outgoing connections in bridge relays. Previously we would use the
19270 same TLS contexts and certs for incoming and outgoing connections.
19271 Bugfix on 0.2.0.3-alpha; addresses bug 988.
19272 - Maintain separate identity keys for incoming and outgoing TLS
19273 contexts in bridge relays. Previously we would use the same
19274 identity keys for incoming and outgoing TLS contexts. Bugfix on
19275 0.2.0.3-alpha; addresses the other half of bug 988.
19276 - Make the bridge directory authority refuse to answer directory
19277 requests for "all descriptors". It used to include bridge
19278 descriptors in its answer, which was a major information leak.
19279 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
19281 o Privacy fixes (clients):
19282 - When receiving a hidden service descriptor, check that it is for
19283 the hidden service we wanted. Previously, Tor would store any
19284 hidden service descriptors that a directory gave it, whether it
19285 wanted them or not. This wouldn't have let an attacker impersonate
19286 a hidden service, but it did let directories pre-seed a client
19287 with descriptors that it didn't want. Bugfix on 0.0.6.
19288 - Start the process of disabling ".exit" address notation, since it
19289 can be used for a variety of esoteric application-level attacks
19290 on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
19292 - Reject attempts at the client side to open connections to private
19293 IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
19294 a randomly chosen exit node. Attempts to do so are always
19295 ill-defined, generally prevented by exit policies, and usually
19296 in error. This will also help to detect loops in transparent
19297 proxy configurations. You can disable this feature by setting
19298 "ClientRejectInternalAddresses 0" in your torrc.
19299 - Log a notice when we get a new control connection. Now it's easier
19300 for security-conscious users to recognize when a local application
19301 is knocking on their controller door. Suggested by bug 1196.
19303 o Privacy fixes (newnym):
19304 - Avoid linkability based on cached hidden service descriptors: forget
19305 all hidden service descriptors cached as a client when processing a
19306 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
19307 - On SIGHUP, do not clear out all TrackHostExits mappings, client
19308 DNS cache entries, and virtual address mappings: that's what
19309 NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
19310 - Don't attach new streams to old rendezvous circuits after SIGNAL
19311 NEWNYM. Previously, we would keep using an existing rendezvous
19312 circuit if it remained open (i.e. if it were kept open by a
19313 long-lived stream, or if a new stream were attached to it before
19314 Tor could notice that it was old and no longer in use). Bugfix on
19315 0.1.1.15-rc; fixes bug 3375.
19317 o Major bugfixes (relay bandwidth accounting):
19318 - Fix a bug that could break accounting on 64-bit systems with large
19319 time_t values, making them hibernate for impossibly long intervals.
19320 Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
19321 - Fix a bug in bandwidth accounting that could make us use twice
19322 the intended bandwidth when our interval start changes due to
19323 daylight saving time. Now we tolerate skew in stored vs computed
19324 interval starts: if the start of the period changes by no more than
19325 50% of the period's duration, we remember bytes that we transferred
19326 in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
19328 o Major bugfixes (bridges):
19329 - Bridges now use "reject *:*" as their default exit policy. Bugfix
19330 on 0.2.0.3-alpha. Fixes bug 1113.
19331 - If you configure your bridge with a known identity fingerprint,
19332 and the bridge authority is unreachable (as it is in at least
19333 one country now), fall back to directly requesting the descriptor
19334 from the bridge. Finishes the feature started in 0.2.0.10-alpha;
19336 - Fix a bug where bridge users who configure the non-canonical
19337 address of a bridge automatically switch to its canonical
19338 address. If a bridge listens at more than one address, it
19339 should be able to advertise those addresses independently and
19340 any non-blocked addresses should continue to work. Bugfix on Tor
19341 0.2.0.3-alpha. Fixes bug 2510.
19342 - If you configure Tor to use bridge A, and then quit and
19343 configure Tor to use bridge B instead (or if you change Tor
19344 to use bridge B via the controller), it would happily continue
19345 to use bridge A if it's still reachable. While this behavior is
19346 a feature if your goal is connectivity, in some scenarios it's a
19347 dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
19348 - When the controller configures a new bridge, don't wait 10 to 60
19349 seconds before trying to fetch its descriptor. Bugfix on
19350 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
19352 o Major bugfixes (directory authorities):
19353 - Many relays have been falling out of the consensus lately because
19354 not enough authorities know about their descriptor for them to get
19355 a majority of votes. When we deprecated the v2 directory protocol,
19356 we got rid of the only way that v3 authorities can hear from each
19357 other about other descriptors. Now authorities examine every v3
19358 vote for new descriptors, and fetch them from that authority. Bugfix
19360 - Authorities could be tricked into giving out the Exit flag to relays
19361 that didn't allow exiting to any ports. This bug could screw
19362 with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
19363 1238. Bug discovered by Martin Kowalczyk.
19364 - If all authorities restart at once right before a consensus vote,
19365 nobody will vote about "Running", and clients will get a consensus
19366 with no usable relays. Instead, authorities refuse to build a
19367 consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
19369 o Major bugfixes (stream-level fairness):
19370 - When receiving a circuit-level SENDME for a blocked circuit, try
19371 to package cells fairly from all the streams that had previously
19372 been blocked on that circuit. Previously, we had started with the
19373 oldest stream, and allowed each stream to potentially exhaust
19374 the circuit's package window. This gave older streams on any
19375 given circuit priority over newer ones. Fixes bug 1937. Detected
19376 originally by Camilo Viecco. This bug was introduced before the
19377 first Tor release, in svn commit r152: it is the new winner of
19378 the longest-lived bug prize.
19379 - Fix a stream fairness bug that would cause newer streams on a given
19380 circuit to get preference when reading bytes from the origin or
19381 destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
19382 introduced before the first Tor release, in svn revision r152.
19383 - When the exit relay got a circuit-level sendme cell, it started
19384 reading on the exit streams, even if had 500 cells queued in the
19385 circuit queue already, so the circuit queue just grew and grew in
19386 some cases. We fix this by not re-enabling reading on receipt of a
19387 sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
19388 on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
19390 - Newly created streams were allowed to read cells onto circuits,
19391 even if the circuit's cell queue was blocked and waiting to drain.
19392 This created potential unfairness, as older streams would be
19393 blocked, but newer streams would gladly fill the queue completely.
19394 We add code to detect this situation and prevent any stream from
19395 getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
19398 o Major bugfixes (hidden services):
19399 - Apply circuit timeouts to opened hidden-service-related circuits
19400 based on the correct start time. Previously, we would apply the
19401 circuit build timeout based on time since the circuit's creation;
19402 it was supposed to be applied based on time since the circuit
19403 entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
19404 - Improve hidden service robustness: When we find that we have
19405 extended a hidden service's introduction circuit to a relay not
19406 listed as an introduction point in the HS descriptor we currently
19407 have, retry with an introduction point from the current
19408 descriptor. Previously we would just give up. Fixes bugs 1024 and
19409 1930; bugfix on 0.2.0.10-alpha.
19410 - Directory authorities now use data collected from their own
19411 uptime observations when choosing whether to assign the HSDir flag
19412 to relays, instead of trusting the uptime value the relay reports in
19413 its descriptor. This change helps prevent an attack where a small
19414 set of nodes with frequently-changing identity keys can blackhole
19415 a hidden service. (Only authorities need upgrade; others will be
19416 fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
19417 - Stop assigning the HSDir flag to relays that disable their
19418 DirPort (and thus will refuse to answer directory requests). This
19419 fix should dramatically improve the reachability of hidden services:
19420 hidden services and hidden service clients pick six HSDir relays
19421 to store and retrieve the hidden service descriptor, and currently
19422 about half of the HSDir relays will refuse to work. Bugfix on
19423 0.2.0.10-alpha; fixes part of bug 1693.
19425 o Major bugfixes (misc):
19426 - Clients now stop trying to use an exit node associated with a given
19427 destination by TrackHostExits if they fail to reach that exit node.
19428 Fixes bug 2999. Bugfix on 0.2.0.20-rc.
19429 - Fix a regression that caused Tor to rebind its ports if it receives
19430 SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
19431 - Remove an extra pair of quotation marks around the error
19432 message in control-port STATUS_GENERAL BUG events. Bugfix on
19433 0.1.2.6-alpha; fixes bug 3732.
19435 o Minor features (relays):
19436 - Ensure that no empty [dirreq-](read|write)-history lines are added
19437 to an extrainfo document. Implements ticket 2497.
19438 - When bandwidth accounting is enabled, be more generous with how
19439 much bandwidth we'll use up before entering "soft hibernation".
19440 Previously, we'd refuse new connections and circuits once we'd
19441 used up 95% of our allotment. Now, we use up 95% of our allotment,
19442 AND make sure that we have no more than 500MB (or 3 hours of
19443 expected traffic, whichever is lower) remaining before we enter
19445 - Relays now log the reason for publishing a new relay descriptor,
19446 so we have a better chance of hunting down instances of bug 1810.
19447 Resolves ticket 3252.
19448 - Log a little more clearly about the times at which we're no longer
19449 accepting new connections (e.g. due to hibernating). Resolves
19451 - When AllowSingleHopExits is set, print a warning to explain to the
19452 relay operator why most clients are avoiding her relay.
19453 - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
19454 Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
19455 clients are already deprecated because of security bugs.
19457 o Minor features (network statistics):
19458 - Directory mirrors that set "DirReqStatistics 1" write statistics
19459 about directory requests to disk every 24 hours. As compared to the
19460 "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
19461 improvements: 1) stats are written to disk exactly every 24 hours;
19462 2) estimated shares of v2 and v3 requests are determined as mean
19463 values, not at the end of a measurement period; 3) unresolved
19464 requests are listed with country code '??'; 4) directories also
19465 measure download times.
19466 - Exit nodes that set "ExitPortStatistics 1" write statistics on the
19467 number of exit streams and transferred bytes per port to disk every
19469 - Relays that set "CellStatistics 1" write statistics on how long
19470 cells spend in their circuit queues to disk every 24 hours.
19471 - Entry nodes that set "EntryStatistics 1" write statistics on the
19472 rough number and origins of connecting clients to disk every 24
19474 - Relays that write any of the above statistics to disk and set
19475 "ExtraInfoStatistics 1" include the past 24 hours of statistics in
19476 their extra-info documents. Implements proposal 166.
19478 o Minor features (GeoIP and statistics):
19479 - Provide a log message stating which geoip file we're parsing
19480 instead of just stating that we're parsing the geoip file.
19481 Implements ticket 2432.
19482 - Make sure every relay writes a state file at least every 12 hours.
19483 Previously, a relay could go for weeks without writing its state
19484 file, and on a crash could lose its bandwidth history, capacity
19485 estimates, client country statistics, and so on. Addresses bug 3012.
19486 - Relays report the number of bytes spent on answering directory
19487 requests in extra-info descriptors similar to {read,write}-history.
19488 Implements enhancement 1790.
19489 - Report only the top 10 ports in exit-port stats in order not to
19490 exceed the maximum extra-info descriptor length of 50 KB. Implements
19492 - If writing the state file to disk fails, wait up to an hour before
19493 retrying again, rather than trying again each second. Fixes bug
19494 2346; bugfix on Tor 0.1.1.3-alpha.
19495 - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
19496 when we switch from being a public relay to a bridge. Otherwise
19497 there will still be clients that see the relay in their consensus,
19498 and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
19500 - Update to the August 2 2011 Maxmind GeoLite Country database.
19502 o Minor features (clients):
19503 - When expiring circuits, use microsecond timers rather than
19504 one-second timers. This can avoid an unpleasant situation where a
19505 circuit is launched near the end of one second and expired right
19506 near the beginning of the next, and prevent fluctuations in circuit
19508 - If we've configured EntryNodes and our network goes away and/or all
19509 our entrynodes get marked down, optimistically retry them all when
19510 a new socks application request appears. Fixes bug 1882.
19511 - Always perform router selections using weighted relay bandwidth,
19512 even if we don't need a high capacity circuit at the time. Non-fast
19513 circuits now only differ from fast ones in that they can use relays
19514 not marked with the Fast flag. This "feature" could turn out to
19515 be a horrible bug; we should investigate more before it goes into
19517 - When we run out of directory information such that we can't build
19518 circuits, but then get enough that we can build circuits, log when
19519 we actually construct a circuit, so the user has a better chance of
19520 knowing what's going on. Fixes bug 1362.
19521 - Log SSL state transitions at debug level during handshake, and
19522 include SSL states in error messages. This may help debug future
19523 SSL handshake issues.
19525 o Minor features (directory authorities):
19526 - When a router changes IP address or port, authorities now launch
19527 a new reachability test for it. Implements ticket 1899.
19528 - Directory authorities now reject relays running any versions of
19529 Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
19530 known bugs that keep RELAY_EARLY cells from working on rendezvous
19531 circuits. Followup to fix for bug 2081.
19532 - Directory authorities now reject relays running any version of Tor
19533 older than 0.2.0.26-rc. That version is the earliest that fetches
19534 current directory information correctly. Fixes bug 2156.
19535 - Directory authorities now do an immediate reachability check as soon
19536 as they hear about a new relay. This change should slightly reduce
19537 the time between setting up a relay and getting listed as running
19538 in the consensus. It should also improve the time between setting
19539 up a bridge and seeing use by bridge users.
19540 - Directory authorities no longer launch a TLS connection to every
19541 relay as they startup. Now that we have 2k+ descriptors cached,
19542 the resulting network hiccup is becoming a burden. Besides,
19543 authorities already avoid voting about Running for the first half
19544 hour of their uptime.
19545 - Directory authorities now log the source of a rejected POSTed v3
19546 networkstatus vote, so we can track failures better.
19547 - Backport code from 0.2.3.x that allows directory authorities to
19548 clean their microdescriptor caches. Needed to resolve bug 2230.
19550 o Minor features (hidden services):
19551 - Use computed circuit-build timeouts to decide when to launch
19552 parallel introduction circuits for hidden services. (Previously,
19553 we would retry after 15 seconds.)
19554 - Don't allow v0 hidden service authorities to act as clients.
19555 Required by fix for bug 3000.
19556 - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
19557 by fix for bug 3000.
19558 - Make hidden services work better in private Tor networks by not
19559 requiring any uptime to join the hidden service descriptor
19560 DHT. Implements ticket 2088.
19561 - Log (at info level) when purging pieces of hidden-service-client
19562 state because of SIGNAL NEWNYM.
19564 o Minor features (controller interface):
19565 - New "GETINFO net/listeners/(type)" controller command to return
19566 a list of addresses and ports that are bound for listeners for a
19567 given connection type. This is useful when the user has configured
19568 "SocksPort auto" and the controller needs to know which port got
19569 chosen. Resolves another part of ticket 3076.
19570 - Have the controller interface give a more useful message than
19571 "Internal Error" in response to failed GETINFO requests.
19572 - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
19573 event, to give information on the current rate of circuit timeouts
19574 over our stored history.
19575 - The 'EXTENDCIRCUIT' control port command can now be used with
19576 a circ id of 0 and no path. This feature will cause Tor to build
19577 a new 'fast' general purpose circuit using its own path selection
19579 - Added a BUILDTIMEOUT_SET controller event to describe changes
19580 to the circuit build timeout.
19581 - New controller command "getinfo config-text". It returns the
19582 contents that Tor would write if you send it a SAVECONF command,
19583 so the controller can write the file to disk itself.
19585 o Minor features (controller protocol):
19586 - Add a new ControlSocketsGroupWritable configuration option: when
19587 it is turned on, ControlSockets are group-writeable by the default
19588 group of the current user. Patch by Jérémy Bobbio; implements
19590 - Tor now refuses to create a ControlSocket in a directory that is
19591 world-readable (or group-readable if ControlSocketsGroupWritable
19592 is 0). This is necessary because some operating systems do not
19593 enforce permissions on an AF_UNIX sockets. Permissions on the
19594 directory holding the socket, however, seems to work everywhere.
19595 - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
19596 not. This would lead to a cookie that is still not group readable.
19597 Closes bug 1843. Suggested by katmagic.
19598 - Future-proof the controller protocol a bit by ignoring keyword
19599 arguments we do not recognize.
19601 o Minor features (more useful logging):
19602 - Revise most log messages that refer to nodes by nickname to
19603 instead use the "$key=nickname at address" format. This should be
19604 more useful, especially since nicknames are less and less likely
19605 to be unique. Resolves ticket 3045.
19606 - When an HTTPS proxy reports "403 Forbidden", we now explain
19607 what it means rather than calling it an unexpected status code.
19608 Closes bug 2503. Patch from Michael Yakubovich.
19609 - Rate-limit a warning about failures to download v2 networkstatus
19610 documents. Resolves part of bug 1352.
19611 - Rate-limit the "your application is giving Tor only an IP address"
19612 warning. Addresses bug 2000; bugfix on 0.0.8pre2.
19613 - Rate-limit "Failed to hand off onionskin" warnings.
19614 - When logging a rate-limited warning, we now mention how many messages
19615 got suppressed since the last warning.
19616 - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
19617 2 no signature, 4 required" messages about consensus signatures
19618 easier to read, and make sure they get logged at the same severity
19619 as the messages explaining which keys are which. Fixes bug 1290.
19620 - Don't warn when we have a consensus that we can't verify because
19621 of missing certificates, unless those certificates are ones
19622 that we have been trying and failing to download. Fixes bug 1145.
19624 o Minor features (log domains):
19625 - Add documentation for configuring logging at different severities in
19626 different log domains. We've had this feature since 0.2.1.1-alpha,
19627 but for some reason it never made it into the manpage. Fixes
19629 - Make it simpler to specify "All log domains except for A and B".
19630 Previously you needed to say "[*,~A,~B]". Now you can just say
19632 - Add a "LogMessageDomains 1" option to include the domains of log
19633 messages along with the messages. Without this, there's no way
19634 to use log domains without reading the source or doing a lot
19636 - Add a new "Handshake" log domain for activities that happen
19637 during the TLS handshake.
19639 o Minor features (build process):
19640 - Make compilation with clang possible when using
19641 "--enable-gcc-warnings" by removing two warning options that clang
19642 hasn't implemented yet and by fixing a few warnings. Resolves
19644 - Detect platforms that brokenly use a signed size_t, and refuse to
19645 build there. Found and analyzed by doorss and rransom.
19646 - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
19648 - Add support for statically linking zlib by specifying
19649 "--enable-static-zlib", to go with our support for statically
19650 linking openssl and libevent. Resolves bug 1358.
19651 - Instead of adding the svn revision to the Tor version string, report
19652 the git commit (when we're building from a git checkout).
19653 - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
19655 - New --digests command-line switch to output the digests of the
19656 source files Tor was built with.
19657 - Generate our manpage and HTML documentation using Asciidoc. This
19658 change should make it easier to maintain the documentation, and
19659 produce nicer HTML. The build process fails if asciidoc cannot
19660 be found and building with asciidoc isn't disabled (via the
19661 "--disable-asciidoc" argument to ./configure. Skipping the manpage
19662 speeds up the build considerably.
19664 o Minor features (options / torrc):
19665 - Warn when the same option is provided more than once in a torrc
19666 file, on the command line, or in a single SETCONF statement, and
19667 the option is one that only accepts a single line. Closes bug 1384.
19668 - Warn when the user configures two HiddenServiceDir lines that point
19669 to the same directory. Bugfix on 0.0.6 (the version introducing
19670 HiddenServiceDir); fixes bug 3289.
19671 - Add new "perconnbwrate" and "perconnbwburst" consensus params to
19672 do individual connection-level rate limiting of clients. The torrc
19673 config options with the same names trump the consensus params, if
19674 both are present. Replaces the old "bwconnrate" and "bwconnburst"
19675 consensus params which were broken from 0.2.2.7-alpha through
19676 0.2.2.14-alpha. Closes bug 1947.
19677 - New config option "WarnUnsafeSocks 0" disables the warning that
19678 occurs whenever Tor receives a socks handshake using a version of
19679 the socks protocol that can only provide an IP address (rather
19680 than a hostname). Setups that do DNS locally over Tor are fine,
19681 and we shouldn't spam the logs in that case.
19682 - New config option "CircuitStreamTimeout" to override our internal
19683 timeout schedule for how many seconds until we detach a stream from
19684 a circuit and try a new circuit. If your network is particularly
19685 slow, you might want to set this to a number like 60.
19686 - New options for SafeLogging to allow scrubbing only log messages
19687 generated while acting as a relay. Specify "SafeLogging relay" if
19688 you want to ensure that only messages known to originate from
19689 client use of the Tor process will be logged unsafely.
19690 - Time and memory units in the configuration file can now be set to
19691 fractional units. For example, "2.5 GB" is now a valid value for
19693 - Support line continuations in the torrc config file. If a line
19694 ends with a single backslash character, the newline is ignored, and
19695 the configuration value is treated as continuing on the next line.
19698 o Minor features (unit tests):
19699 - Revise our unit tests to use the "tinytest" framework, so we
19700 can run tests in their own processes, have smarter setup/teardown
19701 code, and so on. The unit test code has moved to its own
19702 subdirectory, and has been split into multiple modules.
19703 - Add a unit test for cross-platform directory-listing code.
19704 - Add some forgotten return value checks during unit tests. Found
19706 - Use GetTempDir to find the proper temporary directory location on
19707 Windows when generating temporary files for the unit tests. Patch
19710 o Minor features (misc):
19711 - The "torify" script now uses torsocks where available.
19712 - Make Libevent log messages get delivered to controllers later,
19713 and not from inside the Libevent log handler. This prevents unsafe
19714 reentrant Libevent calls while still letting the log messages
19716 - Certain Tor clients (such as those behind check.torproject.org) may
19717 want to fetch the consensus in an extra early manner. To enable this
19718 a user may now set FetchDirInfoExtraEarly to 1. This also depends on
19719 setting FetchDirInfoEarly to 1. Previous behavior will stay the same
19720 as only certain clients who must have this information sooner should
19722 - Expand homedirs passed to tor-checkkey. This should silence a
19723 coverity complaint about passing a user-supplied string into
19724 open() without checking it.
19725 - Make sure to disable DirPort if running as a bridge. DirPorts aren't
19726 used on bridges, and it makes bridge scanning somewhat easier.
19727 - Create the /var/run/tor directory on startup on OpenSUSE if it is
19728 not already created. Patch from Andreas Stieger. Fixes bug 2573.
19730 o Minor bugfixes (relays):
19731 - When a relay decides that its DNS is too broken for it to serve
19732 as an exit server, it advertised itself as a non-exit, but
19733 continued to act as an exit. This could create accidental
19734 partitioning opportunities for users. Instead, if a relay is
19735 going to advertise reject *:* as its exit policy, it should
19736 really act with exit policy "reject *:*". Fixes bug 2366.
19737 Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
19738 - Publish a router descriptor even if generating an extra-info
19739 descriptor fails. Previously we would not publish a router
19740 descriptor without an extra-info descriptor; this can cause fast
19741 exit relays collecting exit-port statistics to drop from the
19742 consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
19743 - When we're trying to guess whether we know our IP address as
19744 a relay, we would log various ways that we failed to guess
19745 our address, but never log that we ended up guessing it
19746 successfully. Now add a log line to help confused and anxious
19747 relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
19748 - For bandwidth accounting, calculate our expected bandwidth rate
19749 based on the time during which we were active and not in
19750 soft-hibernation during the last interval. Previously, we were
19751 also considering the time spent in soft-hibernation. If this
19752 was a long time, we would wind up underestimating our bandwidth
19753 by a lot, and skewing our wakeup time towards the start of the
19754 accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
19755 - Demote a confusing TLS warning that relay operators might get when
19756 someone tries to talk to their ORPort. It is not the operator's
19757 fault, nor can they do anything about it. Fixes bug 1364; bugfix
19759 - Change "Application request when we're believed to be offline."
19760 notice to "Application request when we haven't used client
19761 functionality lately.", to clarify that it's not an error. Bugfix
19762 on 0.0.9.3; fixes bug 1222.
19764 o Minor bugfixes (bridges):
19765 - When a client starts or stops using bridges, never use a circuit
19766 that was built before the configuration change. This behavior could
19767 put at risk a user who uses bridges to ensure that her traffic
19768 only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
19770 - Do not reset the bridge descriptor download status every time we
19771 re-parse our configuration or get a configuration change. Fixes
19772 bug 3019; bugfix on 0.2.0.3-alpha.
19773 - Users couldn't configure a regular relay to be their bridge. It
19774 didn't work because when Tor fetched the bridge descriptor, it found
19775 that it already had it, and didn't realize that the purpose of the
19776 descriptor had changed. Now we replace routers with a purpose other
19777 than bridge with bridge descriptors when fetching them. Bugfix on
19778 0.1.1.9-alpha. Fixes bug 1776.
19779 - In the special case where you configure a public exit relay as your
19780 bridge, Tor would be willing to use that exit relay as the last
19781 hop in your circuit as well. Now we fail that circuit instead.
19782 Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
19784 o Minor bugfixes (clients):
19785 - We now ask the other side of a stream (the client or the exit)
19786 for more data on that stream when the amount of queued data on
19787 that stream dips low enough. Previously, we wouldn't ask the
19788 other side for more data until either it sent us more data (which
19789 it wasn't supposed to do if it had exhausted its window!) or we
19790 had completely flushed all our queued data. This flow control fix
19791 should improve throughput. Fixes bug 2756; bugfix on the earliest
19792 released versions of Tor (svn commit r152).
19793 - When a client finds that an origin circuit has run out of 16-bit
19794 stream IDs, we now mark it as unusable for new streams. Previously,
19795 we would try to close the entire circuit. Bugfix on 0.0.6.
19796 - Make it explicit that we don't cannibalize one-hop circuits. This
19797 happens in the wild, but doesn't turn out to be a problem because
19798 we fortunately don't use those circuits. Many thanks to outofwords
19799 for the initial analysis and to swissknife who confirmed that
19800 two-hop circuits are actually created.
19801 - Resolve an edge case in path weighting that could make us misweight
19802 our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
19803 - Make the DNSPort option work with libevent 2.x. Don't alter the
19804 behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
19806 o Minor bugfixes (directory authorities):
19807 - Make directory authorities more accurate at recording when
19808 relays that have failed several reachability tests became
19809 unreachable, so we can provide more accuracy at assigning Stable,
19810 Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
19811 - Directory authorities are now more robust to hops back in time
19812 when calculating router stability. Previously, if a run of uptime
19813 or downtime appeared to be negative, the calculation could give
19814 incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
19816 - Directory authorities will now attempt to download consensuses
19817 if their own efforts to make a live consensus have failed. This
19818 change means authorities that restart will fetch a valid
19819 consensus, and it means authorities that didn't agree with the
19820 current consensus will still fetch and serve it if it has enough
19821 signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
19822 - Never vote for a server as "Running" if we have a descriptor for
19823 it claiming to be hibernating, and that descriptor was published
19824 more recently than our last contact with the server. Bugfix on
19825 0.2.0.3-alpha; fixes bug 911.
19826 - Directory authorities no longer change their opinion of, or vote on,
19827 whether a router is Running, unless they have themselves been
19828 online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
19831 o Minor bugfixes (hidden services):
19832 - Log malformed requests for rendezvous descriptors as protocol
19833 warnings, not warnings. Also, use a more informative log message
19834 in case someone sees it at log level warning without prior
19835 info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
19836 - Accept hidden service descriptors if we think we might be a hidden
19837 service directory, regardless of what our consensus says. This
19838 helps robustness, since clients and hidden services can sometimes
19839 have a more up-to-date view of the network consensus than we do,
19840 and if they think that the directory authorities list us a HSDir,
19841 we might actually be one. Related to bug 2732; bugfix on
19843 - Correct the warning displayed when a rendezvous descriptor exceeds
19844 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
19846 - Clients and hidden services now use HSDir-flagged relays for hidden
19847 service descriptor downloads and uploads even if the relays have no
19848 DirPort set and the client has disabled TunnelDirConns. This will
19849 eventually allow us to give the HSDir flag to relays with no
19850 DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
19851 - Only limit the lengths of single HS descriptors, even when multiple
19852 HS descriptors are published to an HSDir relay in a single POST
19853 operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
19855 o Minor bugfixes (controllers):
19856 - Allow GETINFO fingerprint to return a fingerprint even when
19857 we have not yet built a router descriptor. Fixes bug 3577;
19858 bugfix on 0.2.0.1-alpha.
19859 - Send a SUCCEEDED stream event to the controller when a reverse
19860 resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
19861 discovered by katmagic.
19862 - Remove a trailing asterisk from "exit-policy/default" in the
19863 output of the control port command "GETINFO info/names". Bugfix
19865 - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
19866 2917. Bugfix on 0.1.1.1-alpha.
19867 - When we restart our relay, we might get a successful connection
19868 from the outside before we've started our reachability tests,
19869 triggering a warning: "ORPort found reachable, but I have no
19870 routerinfo yet. Failing to inform controller of success." This
19871 bug was harmless unless Tor is running under a controller
19872 like Vidalia, in which case the controller would never get a
19873 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
19875 - When a controller changes TrackHostExits, remove mappings for
19876 hosts that should no longer have their exits tracked. Bugfix on
19878 - When a controller changes VirtualAddrNetwork, remove any mappings
19879 for hosts that were automapped to the old network. Bugfix on
19881 - When a controller changes one of the AutomapHosts* options, remove
19882 any mappings for hosts that should no longer be automapped. Bugfix
19884 - Fix an off-by-one error in calculating some controller command
19885 argument lengths. Fortunately, this mistake is harmless since
19886 the controller code does redundant NUL termination too. Found by
19887 boboper. Bugfix on 0.1.1.1-alpha.
19888 - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
19889 would return "551 Internal error" rather than "552 Unrecognized key
19890 ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
19891 - Don't spam the controller with events when we have no file
19892 descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
19893 for log messages was already solved from bug 748.)
19894 - Emit a GUARD DROPPED controller event for a case we missed.
19895 - Ensure DNS requests launched by "RESOLVE" commands from the
19896 controller respect the __LeaveStreamsUnattached setconf options. The
19897 same goes for requests launched via DNSPort or transparent
19898 proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
19900 o Minor bugfixes (config options):
19901 - Tor used to limit HttpProxyAuthenticator values to 48 characters.
19902 Change the limit to 512 characters by removing base64 newlines.
19903 Fixes bug 2752. Fix by Michael Yakubovich.
19904 - Complain if PublishServerDescriptor is given multiple arguments that
19905 include 0 or 1. This configuration will be rejected in the future.
19906 Bugfix on 0.2.0.1-alpha; closes bug 1107.
19907 - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
19908 Bugfix on 0.2.0.13-alpha; closes bug 928.
19910 o Minor bugfixes (log subsystem fixes):
19911 - When unable to format an address as a string, report its value
19912 as "???" rather than reusing the last formatted address. Bugfix
19914 - Be more consistent in our treatment of file system paths. "~" should
19915 get expanded to the user's home directory in the Log config option.
19916 Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
19917 feature for the -f and --DataDirectory options.
19919 o Minor bugfixes (memory management):
19920 - Don't stack-allocate the list of supplementary GIDs when we're
19921 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
19922 could take up to 256K, which is way too much stack. Found by
19923 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
19924 - Save a couple bytes in memory allocation every time we escape
19925 certain characters in a string. Patch from Florian Zumbiehl.
19927 o Minor bugfixes (protocol correctness):
19928 - When checking for 1024-bit keys, check for 1024 bits, not 128
19929 bytes. This allows Tor to correctly discard keys of length 1017
19930 through 1023. Bugfix on 0.0.9pre5.
19931 - Require that introduction point keys and onion handshake keys
19932 have a public exponent of 65537. Starts to fix bug 3207; bugfix
19934 - Handle SOCKS messages longer than 128 bytes long correctly, rather
19935 than waiting forever for them to finish. Fixes bug 2330; bugfix
19936 on 0.2.0.16-alpha. Found by doorss.
19937 - Never relay a cell for a circuit we have already destroyed.
19938 Between marking a circuit as closeable and finally closing it,
19939 it may have been possible for a few queued cells to get relayed,
19940 even though they would have been immediately dropped by the next
19941 OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
19942 - Never queue a cell for a circuit that's already been marked
19944 - Fix a spec conformance issue: the network-status-version token
19945 must be the first token in a v3 consensus or vote. Discovered by
19946 "parakeep". Bugfix on 0.2.0.3-alpha.
19947 - A networkstatus vote must contain exactly one signature. Spec
19948 conformance issue. Bugfix on 0.2.0.3-alpha.
19949 - When asked about a DNS record type we don't support via a
19950 client DNSPort, reply with NOTIMPL rather than an empty
19951 reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
19952 - Make more fields in the controller protocol case-insensitive, since
19953 control-spec.txt said they were.
19955 o Minor bugfixes (log messages):
19956 - Fix a log message that said "bits" while displaying a value in
19957 bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
19959 - Downgrade "no current certificates known for authority" message from
19960 Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
19961 - Correctly describe errors that occur when generating a TLS object.
19962 Previously we would attribute them to a failure while generating a
19963 TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
19965 - Fix an instance where a Tor directory mirror might accidentally
19966 log the IP address of a misbehaving Tor client. Bugfix on
19968 - Stop logging at severity 'warn' when some other Tor client tries
19969 to establish a circuit with us using weak DH keys. It's a protocol
19970 violation, but that doesn't mean ordinary users need to hear about
19971 it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
19972 - If your relay can't keep up with the number of incoming create
19973 cells, it would log one warning per failure into your logs. Limit
19974 warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
19976 o Minor bugfixes (build fixes):
19977 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
19978 - When warning about missing zlib development packages during compile,
19979 give the correct package names. Bugfix on 0.2.0.1-alpha.
19980 - Fix warnings that newer versions of autoconf produce during
19981 ./autogen.sh. These warnings appear to be harmless in our case,
19982 but they were extremely verbose. Fixes bug 2020.
19983 - Squash a compile warning on OpenBSD. Reported by Tas; fixes
19986 o Minor bugfixes (portability):
19987 - Write several files in text mode, on OSes that distinguish text
19988 mode from binary mode (namely, Windows). These files are:
19989 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
19990 that collect those statistics; 'client_keys' and 'hostname' for
19991 hidden services that use authentication; and (in the tor-gencert
19992 utility) newly generated identity and signing keys. Previously,
19993 we wouldn't specify text mode or binary mode, leading to an
19994 assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
19995 the DirRecordUsageByCountry option which would have triggered
19996 the assertion failure was added), although this assertion failure
19997 would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
19998 - Selectively disable deprecation warnings on OS X because Lion
19999 started deprecating the shipped copy of openssl. Fixes bug 3643.
20000 - Use a wide type to hold sockets when built for 64-bit Windows.
20002 - Fix an issue that prevented static linking of libevent on
20003 some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
20004 where we introduced the "--with-static-libevent" configure option.
20005 - Fix a bug with our locking implementation on Windows that couldn't
20006 correctly detect when a file was already locked. Fixes bug 2504,
20007 bugfix on 0.2.1.6-alpha.
20008 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
20010 - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
20011 Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
20014 o Minor bugfixes (code correctness):
20015 - Always NUL-terminate the sun_path field of a sockaddr_un before
20016 passing it to the kernel. (Not a security issue: kernels are
20017 smart enough to reject bad sockaddr_uns.) Found by Coverity;
20018 CID #428. Bugfix on Tor 0.2.0.3-alpha.
20019 - Make connection_printf_to_buf()'s behavior sane. Its callers
20020 expect it to emit a CRLF iff the format string ends with CRLF;
20021 it actually emitted a CRLF iff (a) the format string ended with
20022 CRLF or (b) the resulting string was over 1023 characters long or
20023 (c) the format string did not end with CRLF *and* the resulting
20024 string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
20025 fixes part of bug 3407.
20026 - Make send_control_event_impl()'s behavior sane. Its callers
20027 expect it to always emit a CRLF at the end of the string; it
20028 might have emitted extra control characters as well. Bugfix on
20029 0.1.1.9-alpha; fixes another part of bug 3407.
20030 - Make crypto_rand_int() check the value of its input correctly.
20031 Previously, it accepted values up to UINT_MAX, but could return a
20032 negative number if given a value above INT_MAX+1. Found by George
20033 Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
20034 - Fix a potential null-pointer dereference while computing a
20035 consensus. Bugfix on 0.2.0.3-alpha, found with the help of
20037 - If we fail to compute the identity digest of a v3 legacy keypair,
20038 warn, and don't use a buffer-full of junk instead. Bugfix on
20039 0.2.1.1-alpha; fixes bug 3106.
20040 - Resolve an untriggerable issue in smartlist_string_num_isin(),
20041 where if the function had ever in the future been used to check
20042 for the presence of a too-large number, it would have given an
20043 incorrect result. (Fortunately, we only used it for 16-bit
20044 values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
20045 - Be more careful about reporting the correct error from a failed
20046 connect() system call. Under some circumstances, it was possible to
20047 look at an incorrect value for errno when sending the end reason.
20048 Bugfix on 0.1.0.1-rc.
20049 - Correctly handle an "impossible" overflow cases in connection byte
20050 counting, where we write or read more than 4GB on an edge connection
20051 in a single second. Bugfix on 0.1.2.8-beta.
20052 - Avoid a double mark-for-free warning when failing to attach a
20053 transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
20055 - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
20056 found by "cypherpunks". This bug was introduced before the first
20057 Tor release, in svn commit r110.
20058 - Fix a bug in bandwidth history state parsing that could have been
20059 triggered if a future version of Tor ever changed the timing
20060 granularity at which bandwidth history is measured. Bugfix on
20061 Tor 0.1.1.11-alpha.
20062 - Add assertions to check for overflow in arguments to
20063 base32_encode() and base32_decode(); fix a signed-unsigned
20064 comparison there too. These bugs are not actually reachable in Tor,
20065 but it's good to prevent future errors too. Found by doorss.
20066 - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
20068 - Set target port in get_interface_address6() correctly. Bugfix
20069 on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
20070 - Fix an impossible-to-actually-trigger buffer overflow in relay
20071 descriptor generation. Bugfix on 0.1.0.15.
20072 - Fix numerous small code-flaws found by Coverity Scan Rung 3.
20074 o Minor bugfixes (code improvements):
20075 - After we free an internal connection structure, overwrite it
20076 with a different memory value than we use for overwriting a freed
20077 internal circuit structure. Should help with debugging. Suggested
20079 - If OpenSSL fails to make a duplicate of a private or public key, log
20080 an error message and try to exit cleanly. May help with debugging
20081 if bug 1209 ever remanifests.
20082 - Some options used different conventions for uppercasing of acronyms
20083 when comparing manpage and source. Fix those in favor of the
20084 manpage, as it makes sense to capitalize acronyms.
20085 - Take a first step towards making or.h smaller by splitting out
20086 function definitions for all source files in src/or/. Leave
20087 structures and defines in or.h for now.
20088 - Remove a few dead assignments during router parsing. Found by
20090 - Don't use 1-bit wide signed bit fields. Found by coverity.
20091 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
20092 None of the cases where we did this before were wrong, but by making
20093 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
20094 - The memarea code now uses a sentinel value at the end of each area
20095 to make sure nothing writes beyond the end of an area. This might
20096 help debug some conceivable causes of bug 930.
20097 - Always treat failure to allocate an RSA key as an unrecoverable
20099 - Add some more defensive programming for architectures that can't
20100 handle unaligned integer accesses. We don't know of any actual bugs
20101 right now, but that's the best time to fix them. Fixes bug 1943.
20103 o Minor bugfixes (misc):
20104 - Fix a rare bug in rend_fn unit tests: we would fail a test when
20105 a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
20106 on 0.2.0.10-alpha; fixes bug 1808.
20107 - Where available, use Libevent 2.0's periodic timers so that our
20108 once-per-second cleanup code gets called even more closely to
20109 once per second than it would otherwise. Fixes bug 943.
20110 - Ignore OutboundBindAddress when connecting to localhost.
20111 Connections to localhost need to come _from_ localhost, or else
20112 local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
20114 - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
20116 - If any of the v3 certs we download are unparseable, we should
20117 actually notice the failure so we don't retry indefinitely. Bugfix
20118 on 0.2.0.x; reported by "rotator".
20119 - When Tor fails to parse a descriptor of any kind, dump it to disk.
20120 Might help diagnosing bug 1051.
20121 - Make our 'torify' script more portable; if we have only one of
20122 'torsocks' or 'tsocks' installed, don't complain to the user;
20123 and explain our warning about tsocks better.
20124 - Fix some urls in the exit notice file and make it XHTML1.1 strict
20125 compliant. Based on a patch from Christian Kujau.
20127 o Documentation changes:
20128 - Modernize the doxygen configuration file slightly. Fixes bug 2707.
20129 - Resolve all doxygen warnings except those for missing documentation.
20131 - Add doxygen documentation for more functions, fields, and types.
20132 - Convert the HACKING file to asciidoc, and add a few new sections
20133 to it, explaining how we use Git, how we make changelogs, and
20134 what should go in a patch.
20135 - Document the default socks host and port (127.0.0.1:9050) for
20137 - Removed some unnecessary files from the source distribution. The
20138 AUTHORS file has now been merged into the people page on the
20139 website. The roadmaps and design doc can now be found in the
20140 projects directory in svn.
20142 o Deprecated and removed features (config):
20143 - Remove the torrc.complete file. It hasn't been kept up to date
20144 and users will have better luck checking out the manpage.
20145 - Remove the HSAuthorityRecordStats option that version 0 hidden
20146 service authorities could use to track statistics of overall v0
20147 hidden service usage.
20148 - Remove the obsolete "NoPublish" option; it has been flagged
20149 as obsolete and has produced a warning since 0.1.1.18-rc.
20150 - Caches no longer download and serve v2 networkstatus documents
20151 unless FetchV2Networkstatus flag is set: these documents haven't
20152 haven't been used by clients or relays since 0.2.0.x. Resolves
20155 o Deprecated and removed features (controller):
20156 - The controller no longer accepts the old obsolete "addr-mappings/"
20157 or "unregistered-servers-" GETINFO values.
20158 - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
20159 always on; using them is necessary for correct forward-compatible
20162 o Deprecated and removed features (misc):
20163 - Hidden services no longer publish version 0 descriptors, and clients
20164 do not request or use version 0 descriptors. However, the old hidden
20165 service authorities still accept and serve version 0 descriptors
20166 when contacted by older hidden services/clients.
20167 - Remove undocumented option "-F" from tor-resolve: it hasn't done
20168 anything since 0.2.1.16-rc.
20169 - Remove everything related to building the expert bundle for OS X.
20170 It has confused many users, doesn't work right on OS X 10.6,
20171 and is hard to get rid of once installed. Resolves bug 1274.
20172 - Remove support for .noconnect style addresses. Nobody was using
20173 them, and they provided another avenue for detecting Tor users
20174 via application-level web tricks.
20175 - When we fixed bug 1038 we had to put in a restriction not to send
20176 RELAY_EARLY cells on rend circuits. This was necessary as long
20177 as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
20178 active. Now remove this obsolete check. Resolves bug 2081.
20179 - Remove workaround code to handle directory responses from servers
20180 that had bug 539 (they would send HTTP status 503 responses _and_
20181 send a body too). Since only server versions before
20182 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
20183 keep the workaround in place.
20184 - Remove the old 'fuzzy time' logic. It was supposed to be used for
20185 handling calculations where we have a known amount of clock skew and
20186 an allowed amount of unknown skew. But we only used it in three
20187 places, and we never adjusted the known/unknown skew values. This is
20188 still something we might want to do someday, but if we do, we'll
20189 want to do it differently.
20190 - Remove the "--enable-iphone" option to ./configure. According to
20191 reports from Marco Bonetti, Tor builds fine without any special
20192 tweaking on recent iPhone SDK versions.
20195 Changes in version 0.2.1.30 - 2011-02-23
20196 Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
20197 change is a slight tweak to Tor's TLS handshake that makes relays
20198 and bridges that run this new version reachable from Iran again.
20199 We don't expect this tweak will win the arms race long-term, but it
20200 buys us time until we roll out a better solution.
20203 - Stop sending a CLOCK_SKEW controller status event whenever
20204 we fetch directory information from a relay that has a wrong clock.
20205 Instead, only inform the controller when it's a trusted authority
20206 that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
20207 the rest of bug 1074.
20208 - Fix a bounds-checking error that could allow an attacker to
20209 remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
20210 Found by "piebeer".
20211 - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
20212 Tor would ignore their RelayBandwidthBurst setting,
20213 potentially using more bandwidth than expected. Bugfix on
20214 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
20215 - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
20216 hidserv" in her torrc. The 'hidserv' argument never controlled
20217 publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
20220 - Adjust our TLS Diffie-Hellman parameters to match those used by
20222 - Update to the February 1 2011 Maxmind GeoLite Country database.
20225 - Check for and reject overly long directory certificates and
20226 directory tokens before they have a chance to hit any assertions.
20227 Bugfix on 0.2.1.28. Found by "doorss".
20228 - Bring the logic that gathers routerinfos and assesses the
20229 acceptability of circuits into line. This prevents a Tor OP from
20230 getting locked in a cycle of choosing its local OR as an exit for a
20231 path (due to a .exit request) and then rejecting the circuit because
20232 its OR is not listed yet. It also prevents Tor clients from using an
20233 OR running in the same instance as an exit (due to a .exit request)
20234 if the OR does not meet the same requirements expected of an OR
20235 running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
20237 o Packaging changes:
20238 - Stop shipping the Tor specs files and development proposal documents
20239 in the tarball. They are now in a separate git repository at
20240 git://git.torproject.org/torspec.git
20241 - Do not include Git version tags as though they are SVN tags when
20242 generating a tarball from inside a repository that has switched
20243 between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
20246 Changes in version 0.2.1.29 - 2011-01-15
20247 Tor 0.2.1.29 continues our recent code security audit work. The main
20248 fix resolves a remote heap overflow vulnerability that can allow remote
20249 code execution. Other fixes address a variety of assert and crash bugs,
20250 most of which we think are hard to exploit remotely.
20252 o Major bugfixes (security):
20253 - Fix a heap overflow bug where an adversary could cause heap
20254 corruption. This bug probably allows remote code execution
20255 attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
20257 - Prevent a denial-of-service attack by disallowing any
20258 zlib-compressed data whose compression factor is implausibly
20259 high. Fixes part of bug 2324; reported by "doorss".
20260 - Zero out a few more keys in memory before freeing them. Fixes
20261 bug 2384 and part of bug 2385. These key instances found by
20262 "cypherpunks", based on Andrew Case's report about being able
20263 to find sensitive data in Tor's memory space if you have enough
20264 permissions. Bugfix on 0.0.2pre9.
20266 o Major bugfixes (crashes):
20267 - Prevent calls to Libevent from inside Libevent log handlers.
20268 This had potential to cause a nasty set of crashes, especially
20269 if running Libevent with debug logging enabled, and running
20270 Tor with a controller watching for low-severity log messages.
20271 Bugfix on 0.1.0.2-rc. Fixes bug 2190.
20272 - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
20273 underflow errors there too. Fixes the other part of bug 2324.
20274 - Fix a bug where we would assert if we ever had a
20275 cached-descriptors.new file (or another file read directly into
20276 memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
20277 on 0.2.1.25. Found by doorss.
20278 - Fix some potential asserts and parsing issues with grossly
20279 malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
20282 o Minor bugfixes (other):
20283 - Fix a bug with handling misformed replies to reverse DNS lookup
20284 requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
20285 bug reported by doorss.
20286 - Fix compilation on mingw when a pthreads compatibility library
20287 has been installed. (We don't want to use it, so we shouldn't
20288 be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
20289 - Fix a bug where we would declare that we had run out of virtual
20290 addresses when the address space was only half-exhausted. Bugfix
20292 - Correctly handle the case where AutomapHostsOnResolve is set but
20293 no virtual addresses are available. Fixes bug 2328; bugfix on
20294 0.1.2.1-alpha. Bug found by doorss.
20295 - Correctly handle wrapping around when we run out of virtual
20296 address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
20299 - Update to the January 1 2011 Maxmind GeoLite Country database.
20300 - Introduce output size checks on all of our decryption functions.
20303 - Tor does not build packages correctly with Automake 1.6 and earlier;
20304 added a check to Makefile.am to make sure that we're building with
20305 Automake 1.7 or later.
20306 - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
20307 because we built it with a too-old version of automake. Thus that
20308 release broke ./configure --enable-openbsd-malloc, which is popular
20309 among really fast exit relays on Linux.
20312 Changes in version 0.2.1.28 - 2010-12-17
20313 Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
20314 exploitable bugs. We also took this opportunity to change the IP address
20315 for one of our directory authorities, and to update the geoip database
20319 - Fix a remotely exploitable bug that could be used to crash instances
20320 of Tor remotely by overflowing on the heap. Remote-code execution
20321 hasn't been confirmed, but can't be ruled out. Everyone should
20322 upgrade. Bugfix on the 0.1.1 series and later.
20324 o Directory authority changes:
20325 - Change IP address and ports for gabelmoo (v3 directory authority).
20328 - Update to the December 1 2010 Maxmind GeoLite Country database.
20331 Changes in version 0.2.1.27 - 2010-11-23
20332 Yet another OpenSSL security patch broke its compatibility with Tor:
20333 Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
20334 also took this opportunity to fix several crash bugs, integrate a new
20335 directory authority, and update the bundled GeoIP database.
20338 - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
20339 No longer set the tlsext_host_name extension on server SSL objects;
20340 but continue to set it on client SSL objects. Our goal in setting
20341 it was to imitate a browser, not a vhosting server. Fixes bug 2204;
20342 bugfix on 0.2.1.1-alpha.
20343 - Do not log messages to the controller while shrinking buffer
20344 freelists. Doing so would sometimes make the controller connection
20345 try to allocate a buffer chunk, which would mess up the internals
20346 of the freelist and cause an assertion failure. Fixes bug 1125;
20347 fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
20348 - Learn our external IP address when we're a relay or bridge, even if
20349 we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
20350 where we introduced bridge relays that don't need to publish to
20351 be useful. Fixes bug 2050.
20352 - Do even more to reject (and not just ignore) annotations on
20353 router descriptors received anywhere but from the cache. Previously
20354 we would ignore such annotations at first, but cache them to disk
20355 anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
20356 - When you're using bridges and your network goes away and your
20357 bridges get marked as down, recover when you attempt a new socks
20358 connection (if the network is back), rather than waiting up to an
20359 hour to try fetching new descriptors for your bridges. Bugfix on
20360 0.2.0.3-alpha; fixes bug 1981.
20363 - Move to the November 2010 Maxmind GeoLite country db (rather
20364 than the June 2009 ip-to-country GeoIP db) for our statistics that
20365 count how many users relays are seeing from each country. Now we'll
20366 have more accurate data, especially for many African countries.
20368 o New directory authorities:
20369 - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
20373 - Fix an assertion failure that could occur in directory caches or
20374 bridge users when using a very short voting interval on a testing
20375 network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
20377 - Enforce multiplicity rules when parsing annotations. Bugfix on
20378 0.2.0.8-alpha. Found by piebeer.
20379 - Allow handshaking OR connections to take a full KeepalivePeriod
20380 seconds to handshake. Previously, we would close them after
20381 IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
20382 were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
20384 - When building with --enable-gcc-warnings on OpenBSD, disable
20385 warnings in system headers. This makes --enable-gcc-warnings
20386 pass on OpenBSD 4.8.
20389 - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
20390 and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
20391 stream ending reason for this case: END_STREAM_REASON_NOROUTE.
20392 Servers can start sending this code when enough clients recognize
20393 it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
20394 - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
20395 Patch from mingw-san.
20398 - Remove the old debian/ directory from the main Tor distribution.
20399 The official Tor-for-debian git repository lives at the URL
20400 https://git.torproject.org/debian/tor.git
20401 - Stop shipping the old doc/website/ directory in the tarball. We
20402 changed the website format in late 2010, and what we shipped in
20403 0.2.1.26 really wasn't that useful anyway.
20406 Changes in version 0.2.1.26 - 2010-05-02
20407 Tor 0.2.1.26 addresses the recent connection and memory overload
20408 problems we've been seeing on relays, especially relays with their
20409 DirPort open. If your relay has been crashing, or you turned it off
20410 because it used too many resources, give this release a try.
20412 This release also fixes yet another instance of broken OpenSSL libraries
20413 that was causing some relays to drop out of the consensus.
20416 - Teach relays to defend themselves from connection overload. Relays
20417 now close idle circuits early if it looks like they were intended
20418 for directory fetches. Relays are also more aggressive about closing
20419 TLS connections that have no circuits on them. Such circuits are
20420 unlikely to be re-used, and tens of thousands of them were piling
20421 up at the fast relays, causing the relays to run out of sockets
20422 and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
20423 their directory fetches over TLS).
20424 - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
20425 that claim to be earlier than 0.9.8m, but which have in reality
20426 backported huge swaths of 0.9.8m or 0.9.8n renegotiation
20427 behavior. Possible fix for some cases of bug 1346.
20428 - Directory mirrors were fetching relay descriptors only from v2
20429 directory authorities, rather than v3 authorities like they should.
20430 Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
20431 to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
20434 - Finally get rid of the deprecated and now harmful notion of "clique
20435 mode", where directory authorities maintain TLS connections to
20439 - In the util/threads test, no longer free the test_mutex before all
20440 worker threads have finished. Bugfix on 0.2.1.6-alpha.
20441 - The master thread could starve the worker threads quite badly on
20442 certain systems, causing them to run only partially in the allowed
20443 window. This resulted in test failures. Now the master thread sleeps
20444 occasionally for a few microseconds while the two worker-threads
20445 compete for the mutex. Bugfix on 0.2.0.1-alpha.
20448 Changes in version 0.2.1.25 - 2010-03-16
20449 Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
20450 prevent relays from guessing their IP address correctly. It also fixes
20451 several minor potential security bugs.
20454 - Fix a regression from our patch for bug 1244 that caused relays
20455 to guess their IP address incorrectly if they didn't set Address
20456 in their torrc and/or their address fails to resolve. Bugfix on
20457 0.2.1.23; fixes bug 1269.
20458 - When freeing a session key, zero it out completely. We only zeroed
20459 the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
20460 patched by ekir. Fixes bug 1254.
20463 - Fix a dereference-then-NULL-check sequence when publishing
20464 descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
20466 - Fix another dereference-then-NULL-check sequence. Bugfix on
20467 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
20468 - Make sure we treat potentially not NUL-terminated strings correctly.
20469 Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
20472 Changes in version 0.2.1.24 - 2010-02-21
20473 Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
20477 - Work correctly out-of-the-box with even more vendor-patched versions
20478 of OpenSSL. In particular, make it so Debian and OS X don't need
20479 customized patches to run/build.
20482 Changes in version 0.2.1.23 - 2010-02-13
20483 Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
20484 again on the latest OS X, and updates the location of a directory
20487 o Major bugfixes (performance):
20488 - We were selecting our guards uniformly at random, and then weighting
20489 which of our guards we'd use uniformly at random. This imbalance
20490 meant that Tor clients were severely limited on throughput (and
20491 probably latency too) by the first hop in their circuit. Now we
20492 select guards weighted by currently advertised bandwidth. We also
20493 automatically discard guards picked using the old algorithm. Fixes
20494 bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
20497 - Make Tor work again on the latest OS X: when deciding whether to
20498 use strange flags to turn TLS renegotiation on, detect the OpenSSL
20499 version at run-time, not compile time. We need to do this because
20500 Apple doesn't update its dev-tools headers when it updates its
20501 libraries in a security patch.
20502 - Fix a potential buffer overflow in lookup_last_hid_serv_request()
20503 that could happen on 32-bit platforms with 64-bit time_t. Also fix
20504 a memory leak when requesting a hidden service descriptor we've
20505 requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
20509 - Refactor resolve_my_address() to not use gethostbyname() anymore.
20510 Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
20513 - Avoid a mad rush at the beginning of each month when each client
20514 rotates half of its guards. Instead we spread the rotation out
20515 throughout the month, but we still avoid leaving a precise timestamp
20516 in the state file about when we first picked the guard. Improves
20517 over the behavior introduced in 0.1.2.17.
20520 Changes in version 0.2.1.22 - 2010-01-19
20521 Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
20522 authorities -- it would tell you its whole history of bridge descriptors
20523 if you make the right directory request. This stable update also
20524 rotates two of the seven v3 directory authority keys and locations.
20526 o Directory authority changes:
20527 - Rotate keys (both v3 identity and relay identity) for moria1
20531 - Stop bridge directory authorities from answering dbg-stability.txt
20532 directory queries, which would let people fetch a list of all
20533 bridge identities they track. Bugfix on 0.2.1.6-alpha.
20536 Changes in version 0.2.1.21 - 2009-12-21
20537 Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
20538 library. If you use Tor on Linux / Unix and you're getting SSL
20539 renegotiation errors, upgrading should help. We also recommend an
20540 upgrade if you're an exit relay.
20543 - Work around a security feature in OpenSSL 0.9.8l that prevents our
20544 handshake from working unless we explicitly tell OpenSSL that we
20545 are using SSL renegotiation safely. We are, of course, but OpenSSL
20546 0.9.8l won't work unless we say we are.
20547 - Avoid crashing if the client is trying to upload many bytes and the
20548 circuit gets torn down at the same time, or if the flip side
20549 happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
20552 - Do not refuse to learn about authority certs and v2 networkstatus
20553 documents that are older than the latest consensus. This bug might
20554 have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
20555 Spotted and fixed by xmux.
20556 - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
20557 trigger platform-specific option misparsing case found by Coverity
20559 - Fix a compilation warning on Fedora 12 by removing an impossible-to-
20560 trigger assert. Fixes bug 1173.
20563 Changes in version 0.2.1.20 - 2009-10-15
20564 Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
20565 services at once, prepares for more performance improvements, and
20566 fixes a bunch of smaller bugs.
20568 The Windows and OS X bundles also include a more recent Vidalia,
20569 and switch from Privoxy to Polipo.
20571 The OS X installers are now drag and drop. It's best to un-install
20572 Tor/Vidalia and then install this new bundle, rather than upgrade. If
20573 you want to upgrade, you'll need to update the paths for Tor and Polipo
20574 in the Vidalia Settings window.
20577 - Send circuit or stream sendme cells when our window has decreased
20578 by 100 cells, not when it has decreased by 101 cells. Bug uncovered
20579 by Karsten when testing the "reduce circuit window" performance
20580 patch. Bugfix on the 54th commit on Tor -- from July 2002,
20581 before the release of Tor 0.0.0. This is the new winner of the
20583 - Fix a remotely triggerable memory leak when a consensus document
20584 contains more than one signature from the same voter. Bugfix on
20586 - Avoid segfault in rare cases when finishing an introduction circuit
20587 as a client and finding out that we don't have an introduction key
20588 for it. Fixes bug 1073. Reported by Aaron Swartz.
20591 - Tor now reads the "circwindow" parameter out of the consensus,
20592 and uses that value for its circuit package window rather than the
20593 default of 1000 cells. Begins the implementation of proposal 168.
20595 o New directory authorities:
20596 - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
20598 - Move moria1 and tonga to alternate IP addresses.
20601 - Fix a signed/unsigned compile warning in 0.2.1.19.
20602 - Fix possible segmentation fault on directory authorities. Bugfix on
20604 - Fix an extremely rare infinite recursion bug that could occur if
20605 we tried to log a message after shutting down the log subsystem.
20606 Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
20607 - Fix an obscure bug where hidden services on 64-bit big-endian
20608 systems might mis-read the timestamp in v3 introduce cells, and
20609 refuse to connect back to the client. Discovered by "rotor".
20610 Bugfix on 0.2.1.6-alpha.
20611 - We were triggering a CLOCK_SKEW controller status event whenever
20612 we connect via the v2 connection protocol to any relay that has
20613 a wrong clock. Instead, we should only inform the controller when
20614 it's a trusted authority that claims our clock is wrong. Bugfix
20615 on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
20616 - We were telling the controller about CHECKING_REACHABILITY and
20617 REACHABILITY_FAILED status events whenever we launch a testing
20618 circuit or notice that one has failed. Instead, only tell the
20619 controller when we want to inform the user of overall success or
20620 overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
20622 - Don't warn when we're using a circuit that ends with a node
20623 excluded in ExcludeExitNodes, but the circuit is not used to access
20624 the outside world. This should help fix bug 1090. Bugfix on
20626 - Work around a small memory leak in some versions of OpenSSL that
20627 stopped the memory used by the hostname TLS extension from being
20631 - Add a "getinfo status/accepted-server-descriptor" controller
20632 command, which is the recommended way for controllers to learn
20633 whether our server descriptor has been successfully received by at
20634 least on directory authority. Un-recommend good-server-descriptor
20635 getinfo and status events until we have a better design for them.
20638 Changes in version 0.2.1.19 - 2009-07-28
20639 Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
20643 - Make accessing hidden services on 0.2.1.x work right again.
20644 Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
20645 part of patch provided by "optimist".
20648 - When a relay/bridge is writing out its identity key fingerprint to
20649 the "fingerprint" file and to its logs, write it without spaces. Now
20650 it will look like the fingerprints in our bridges documentation,
20651 and confuse fewer users.
20654 - Relays no longer publish a new server descriptor if they change
20655 their MaxAdvertisedBandwidth config option but it doesn't end up
20656 changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
20657 fixes bug 1026. Patch from Sebastian.
20658 - Avoid leaking memory every time we get a create cell but we have
20659 so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
20660 fixes bug 1034. Reported by BarkerJr.
20663 Changes in version 0.2.1.18 - 2009-07-24
20664 Tor 0.2.1.18 lays the foundations for performance improvements,
20665 adds status events to help users diagnose bootstrap problems, adds
20666 optional authentication/authorization for hidden services, fixes a
20667 variety of potential anonymity problems, and includes a huge pile of
20668 other features and bug fixes.
20670 o Major features (clients):
20671 - Start sending "bootstrap phase" status events to the controller,
20672 so it can keep the user informed of progress fetching directory
20673 information and establishing circuits. Also inform the controller
20674 if we think we're stuck at a particular bootstrap phase. Implements
20676 - Clients replace entry guards that were chosen more than a few months
20677 ago. This change should significantly improve client performance,
20678 especially once more people upgrade, since relays that have been
20679 a guard for a long time are currently overloaded.
20680 - Network status consensus documents and votes now contain bandwidth
20681 information for each relay. Clients use the bandwidth values
20682 in the consensus, rather than the bandwidth values in each
20683 relay descriptor. This approach opens the door to more accurate
20684 bandwidth estimates once the directory authorities start doing
20685 active measurements. Implements part of proposal 141.
20687 o Major features (relays):
20688 - Disable and refactor some debugging checks that forced a linear scan
20689 over the whole server-side DNS cache. These accounted for over 50%
20690 of CPU time on a relatively busy exit node's gprof profile. Also,
20691 disable some debugging checks that appeared in exit node profile
20692 data. Found by Jacob.
20693 - New DirPortFrontPage option that takes an html file and publishes
20694 it as "/" on the DirPort. Now relay operators can provide a
20695 disclaimer without needing to set up a separate webserver. There's
20696 a sample disclaimer in contrib/tor-exit-notice.html.
20698 o Major features (hidden services):
20699 - Make it possible to build hidden services that only certain clients
20700 are allowed to connect to. This is enforced at several points,
20701 so that unauthorized clients are unable to send INTRODUCE cells
20702 to the service, or even (depending on the type of authentication)
20703 to learn introduction points. This feature raises the bar for
20704 certain kinds of active attacks against hidden services. Design
20705 and code by Karsten Loesing. Implements proposal 121.
20706 - Relays now store and serve v2 hidden service descriptors by default,
20707 i.e., the new default value for HidServDirectoryV2 is 1. This is
20708 the last step in proposal 114, which aims to make hidden service
20709 lookups more reliable.
20711 o Major features (path selection):
20712 - ExitNodes and Exclude*Nodes config options now allow you to restrict
20713 by country code ("{US}") or IP address or address pattern
20714 ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
20715 refinement to decide what config options should take priority if
20716 you ask to both use a particular node and exclude it.
20718 o Major features (misc):
20719 - When building a consensus, do not include routers that are down.
20720 This cuts down 30% to 40% on consensus size. Implements proposal
20722 - New TestingTorNetwork config option to allow adjustment of
20723 previously constant values that could slow bootstrapping. Implements
20724 proposal 135. Patch from Karsten.
20725 - Convert many internal address representations to optionally hold
20726 IPv6 addresses. Generate and accept IPv6 addresses in many protocol
20727 elements. Make resolver code handle nameservers located at IPv6
20729 - More work on making our TLS handshake blend in: modify the list
20730 of ciphers advertised by OpenSSL in client mode to even more
20731 closely resemble a common web browser. We cheat a little so that
20732 we can advertise ciphers that the locally installed OpenSSL doesn't
20734 - Use the TLS1 hostname extension to more closely resemble browser
20737 o Security fixes (anonymity/entropy):
20738 - Never use a connection with a mismatched address to extend a
20739 circuit, unless that connection is canonical. A canonical
20740 connection is one whose address is authenticated by the router's
20741 identity key, either in a NETINFO cell or in a router descriptor.
20742 - Implement most of proposal 110: The first K cells to be sent
20743 along a circuit are marked as special "early" cells; only K "early"
20744 cells will be allowed. Once this code is universal, we can block
20745 certain kinds of denial-of-service attack by requiring that EXTEND
20746 commands must be sent using an "early" cell.
20747 - Resume using OpenSSL's RAND_poll() for better (and more portable)
20748 cross-platform entropy collection again. We used to use it, then
20749 stopped using it because of a bug that could crash systems that
20750 called RAND_poll when they had a lot of fds open. It looks like the
20751 bug got fixed in late 2006. Our new behavior is to call RAND_poll()
20752 at startup, and to call RAND_poll() when we reseed later only if
20753 we have a non-buggy OpenSSL version.
20754 - When the client is choosing entry guards, now it selects at most
20755 one guard from a given relay family. Otherwise we could end up with
20756 all of our entry points into the network run by the same operator.
20757 Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
20758 - Do not use or believe expired v3 authority certificates. Patch
20759 from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
20760 - Drop begin cells to a hidden service if they come from the middle
20761 of a circuit. Patch from lark.
20762 - When we erroneously receive two EXTEND cells for the same circuit
20763 ID on the same connection, drop the second. Patch from lark.
20764 - Authorities now vote for the Stable flag for any router whose
20765 weighted MTBF is at least 5 days, regardless of the mean MTBF.
20766 - Clients now never report any stream end reason except 'MISC'.
20767 Implements proposal 148.
20769 o Major bugfixes (crashes):
20770 - Parse dates and IPv4 addresses in a locale- and libc-independent
20771 manner, to avoid platform-dependent behavior on malformed input.
20772 - Fix a crash that occurs on exit nodes when a nameserver request
20773 timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
20774 been suppressing the bug since 0.1.2.10-alpha. Partial fix for
20776 - Do not assume that a stack-allocated character array will be
20777 64-bit aligned on platforms that demand that uint64_t access is
20778 aligned. Possible fix for bug 604.
20779 - Resolve a very rare crash bug that could occur when the user forced
20780 a nameserver reconfiguration during the middle of a nameserver
20781 probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
20782 - Avoid a "0 divided by 0" calculation when calculating router uptime
20783 at directory authorities. Bugfix on 0.2.0.8-alpha.
20784 - Fix an assertion bug in parsing policy-related options; possible fix
20786 - Rate-limit too-many-sockets messages: when they happen, they happen
20787 a lot and end up filling up the disk. Resolves bug 748.
20788 - Fix a race condition that could cause crashes or memory corruption
20789 when running as a server with a controller listening for log
20791 - Avoid crashing when we have a policy specified in a DirPolicy or
20792 SocksPolicy or ReachableAddresses option with ports set on it,
20793 and we re-load the policy. May fix bug 996.
20794 - Fix an assertion failure on 64-bit platforms when we allocated
20795 memory right up to the end of a memarea, then realigned the memory
20796 one step beyond the end. Fixes a possible cause of bug 930.
20797 - Protect the count of open sockets with a mutex, so we can't
20798 corrupt it when two threads are closing or opening sockets at once.
20799 Fix for bug 939. Bugfix on 0.2.0.1-alpha.
20801 o Major bugfixes (clients):
20802 - Discard router descriptors as we load them if they are more than
20803 five days old. Otherwise if Tor is off for a long time and then
20804 starts with cached descriptors, it will try to use the onion keys
20805 in those obsolete descriptors when building circuits. Fixes bug 887.
20806 - When we choose to abandon a new entry guard because we think our
20807 older ones might be better, close any circuits pending on that
20808 new entry guard connection. This fix should make us recover much
20809 faster when our network is down and then comes back. Bugfix on
20810 0.1.2.8-beta; found by lodger.
20811 - When Tor clients restart after 1-5 days, they discard all their
20812 cached descriptors as too old, but they still use the cached
20813 consensus document. This approach is good for robustness, but
20814 bad for performance: since they don't know any bandwidths, they
20815 end up choosing at random rather than weighting their choice by
20816 speed. Fixed by the above feature of putting bandwidths in the
20819 o Major bugfixes (relays):
20820 - Relays were falling out of the networkstatus consensus for
20821 part of a day if they changed their local config but the
20822 authorities discarded their new descriptor as "not sufficiently
20823 different". Now directory authorities accept a descriptor as changed
20824 if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
20825 patch by Sebastian.
20826 - Ensure that two circuits can never exist on the same connection
20827 with the same circuit ID, even if one is marked for close. This
20828 is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
20829 - Directory authorities were neglecting to mark relays down in their
20830 internal histories if the relays fall off the routerlist without
20831 ever being found unreachable. So there were relays in the histories
20832 that haven't been seen for eight months, and are listed as being
20833 up for eight months. This wreaked havoc on the "median wfu" and
20834 "median mtbf" calculations, in turn making Guard and Stable flags
20835 wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
20838 o Major bugfixes (hidden services):
20839 - When establishing a hidden service, introduction points that
20840 originate from cannibalized circuits were completely ignored
20841 and not included in rendezvous service descriptors. This might
20842 have been another reason for delay in making a hidden service
20843 available. Bugfix from long ago (0.0.9.x?)
20845 o Major bugfixes (memory and resource management):
20846 - Fixed some memory leaks -- some quite frequent, some almost
20847 impossible to trigger -- based on results from Coverity.
20848 - Speed up parsing and cut down on memory fragmentation by using
20849 stack-style allocations for parsing directory objects. Previously,
20850 this accounted for over 40% of allocations from within Tor's code
20851 on a typical directory cache.
20852 - Use a Bloom filter rather than a digest-based set to track which
20853 descriptors we need to keep around when we're cleaning out old
20854 router descriptors. This speeds up the computation significantly,
20855 and may reduce fragmentation.
20857 o New/changed config options:
20858 - Now NodeFamily and MyFamily config options allow spaces in
20859 identity fingerprints, so it's easier to paste them in.
20860 Suggested by Lucky Green.
20861 - Allow ports 465 and 587 in the default exit policy again. We had
20862 rejected them in 0.1.0.15, because back in 2005 they were commonly
20863 misconfigured and ended up as spam targets. We hear they are better
20864 locked down these days.
20865 - Make TrackHostExit mappings expire a while after their last use, not
20866 after their creation. Patch from Robert Hogan.
20867 - Add an ExcludeExitNodes option so users can list a set of nodes
20868 that should be be excluded from the exit node position, but
20869 allowed elsewhere. Implements proposal 151.
20870 - New --hush command-line option similar to --quiet. While --quiet
20871 disables all logging to the console on startup, --hush limits the
20872 output to messages of warning and error severity.
20873 - New configure/torrc options (--enable-geoip-stats,
20874 DirRecordUsageByCountry) to record how many IPs we've served
20875 directory info to in each country code, how many status documents
20876 total we've sent to each country code, and what share of the total
20877 directory requests we should expect to see.
20878 - Make outbound DNS packets respect the OutboundBindAddress setting.
20879 Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
20880 - Allow separate log levels to be configured for different logging
20881 domains. For example, this allows one to log all notices, warnings,
20882 or errors, plus all memory management messages of level debug or
20883 higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
20884 - Update to the "June 3 2009" ip-to-country file.
20886 o Minor features (relays):
20887 - Raise the minimum rate limiting to be a relay from 20000 bytes
20888 to 20480 bytes (aka 20KB/s), to match our documentation. Also
20889 update directory authorities so they always assign the Fast flag
20890 to relays with 20KB/s of capacity. Now people running relays won't
20891 suddenly find themselves not seeing any use, if the network gets
20893 - If we're a relay and we change our IP address, be more verbose
20894 about the reason that made us change. Should help track down
20895 further bugs for relays on dynamic IP addresses.
20896 - Exit servers can now answer resolve requests for ip6.arpa addresses.
20897 - Implement most of Proposal 152: allow specialized servers to permit
20898 single-hop circuits, and clients to use those servers to build
20899 single-hop circuits when using a specialized controller. Patch
20900 from Josh Albrecht. Resolves feature request 768.
20901 - When relays do their initial bandwidth measurement, don't limit
20902 to just our entry guards for the test circuits. Otherwise we tend
20903 to have multiple test circuits going through a single entry guard,
20904 which makes our bandwidth test less accurate. Fixes part of bug 654;
20905 patch contributed by Josh Albrecht.
20907 o Minor features (directory authorities):
20908 - Try not to open more than one descriptor-downloading connection
20909 to an authority at once. This should reduce load on directory
20910 authorities. Fixes bug 366.
20911 - Add cross-certification to newly generated certificates, so that
20912 a signing key is enough information to look up a certificate. Start
20913 serving certificates by <identity digest, signing key digest>
20914 pairs. Implements proposal 157.
20915 - When a directory authority downloads a descriptor that it then
20916 immediately rejects, do not retry downloading it right away. Should
20917 save some bandwidth on authorities. Fix for bug 888. Patch by
20919 - Directory authorities now serve a /tor/dbg-stability.txt URL to
20920 help debug WFU and MTBF calculations.
20921 - In directory authorities' approved-routers files, allow
20922 fingerprints with or without space.
20924 o Minor features (directory mirrors):
20925 - When a download gets us zero good descriptors, do not notify
20926 Tor that new directory information has arrived.
20927 - Servers support a new URL scheme for consensus downloads that
20928 allows the client to specify which authorities are trusted.
20929 The server then only sends the consensus if the client will trust
20930 it. Otherwise a 404 error is sent back. Clients use this
20931 new scheme when the server supports it (meaning it's running
20932 0.2.1.1-alpha or later). Implements proposal 134.
20934 o Minor features (bridges):
20935 - If the bridge config line doesn't specify a port, assume 443.
20936 This makes bridge lines a bit smaller and easier for users to
20938 - If we're using bridges and our network goes away, be more willing
20939 to forgive our bridges and try again when we get an application
20942 o Minor features (hidden services):
20943 - When the client launches an introduction circuit, retry with a
20944 new circuit after 30 seconds rather than 60 seconds.
20945 - Launch a second client-side introduction circuit in parallel
20946 after a delay of 15 seconds (based on work by Christian Wilms).
20947 - Hidden services start out building five intro circuits rather
20948 than three, and when the first three finish they publish a service
20949 descriptor using those. Now we publish our service descriptor much
20950 faster after restart.
20951 - Drop the requirement to have an open dir port for storing and
20952 serving v2 hidden service descriptors.
20954 o Minor features (build and packaging):
20955 - On Linux, use the prctl call to re-enable core dumps when the User
20957 - Try to make sure that the version of Libevent we're running with
20958 is binary-compatible with the one we built with. May address bug
20960 - Add a new --enable-local-appdata configuration switch to change
20961 the default location of the datadir on win32 from APPDATA to
20962 LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
20963 entirely. Patch from coderman.
20964 - Build correctly against versions of OpenSSL 0.9.8 or later that
20965 are built without support for deprecated functions.
20966 - On platforms with a maximum syslog string length, truncate syslog
20967 messages to that length ourselves, rather than relying on the
20968 system to do it for us.
20969 - Automatically detect MacOSX versions earlier than 10.4.0, and
20970 disable kqueue from inside Tor when running with these versions.
20971 We previously did this from the startup script, but that was no
20972 help to people who didn't use the startup script. Resolves bug 863.
20973 - Build correctly when configured to build outside the main source
20974 path. Patch from Michael Gold.
20975 - Disable GCC's strict alias optimization by default, to avoid the
20976 likelihood of its introducing subtle bugs whenever our code violates
20977 the letter of C99's alias rules.
20978 - Change the contrib/tor.logrotate script so it makes the new
20979 logs as "_tor:_tor" rather than the default, which is generally
20980 "root:wheel". Fixes bug 676, reported by Serge Koksharov.
20981 - Change our header file guard macros to be less likely to conflict
20982 with system headers. Adam Langley noticed that we were conflicting
20983 with log.h on Android.
20984 - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
20985 and stop using a warning that had become unfixably verbose under
20987 - Use a lockfile to make sure that two Tor processes are not
20988 simultaneously running with the same datadir.
20989 - Allow OpenSSL to use dynamic locks if it wants.
20990 - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
20992 o Minor features (controllers):
20993 - When generating circuit events with verbose nicknames for
20994 controllers, try harder to look up nicknames for routers on a
20995 circuit. (Previously, we would look in the router descriptors we had
20996 for nicknames, but not in the consensus.) Partial fix for bug 941.
20997 - New controller event NEWCONSENSUS that lists the networkstatus
20998 lines for every recommended relay. Now controllers like Torflow
20999 can keep up-to-date on which relays they should be using.
21000 - New controller event "clients_seen" to report a geoip-based summary
21001 of which countries we've seen clients from recently. Now controllers
21002 like Vidalia can show bridge operators that they're actually making
21004 - Add a 'getinfo status/clients-seen' controller command, in case
21005 controllers want to hear clients_seen events but connect late.
21006 - New CONSENSUS_ARRIVED event to note when a new consensus has
21007 been fetched and validated.
21008 - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
21009 controllers to prevent SIGHUP from reloading the configuration.
21011 - Return circuit purposes in response to GETINFO circuit-status.
21013 - Serve the latest v3 networkstatus consensus via the control
21014 port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
21015 - Add a "GETINFO /status/bootstrap-phase" controller option, so the
21016 controller can query our current bootstrap state in case it attaches
21017 partway through and wants to catch up.
21018 - Provide circuit purposes along with circuit events to the controller.
21020 o Minor features (tools):
21021 - Do not have tor-resolve automatically refuse all .onion addresses;
21022 if AutomapHostsOnResolve is set in your torrc, this will work fine.
21023 - Add a -p option to tor-resolve for specifying the SOCKS port: some
21024 people find host:port too confusing.
21025 - Print the SOCKS5 error message string as well as the error code
21026 when a tor-resolve request fails. Patch from Jacob.
21028 o Minor bugfixes (memory and resource management):
21029 - Clients no longer cache certificates for authorities they do not
21030 recognize. Bugfix on 0.2.0.9-alpha.
21031 - Do not use C's stdio library for writing to log files. This will
21032 improve logging performance by a minute amount, and will stop
21033 leaking fds when our disk is full. Fixes bug 861.
21034 - Stop erroneous use of O_APPEND in cases where we did not in fact
21035 want to re-seek to the end of a file before every last write().
21036 - Fix a small alignment and memory-wasting bug on buffer chunks.
21038 - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
21039 to avoid unused RAM in buffer chunks and memory pools.
21040 - Reduce the default smartlist size from 32 to 16; it turns out that
21041 most smartlists hold around 8-12 elements tops.
21042 - Make dumpstats() log the fullness and size of openssl-internal
21044 - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
21045 patch to their OpenSSL, turn it on to save memory on servers. This
21046 patch will (with any luck) get included in a mainline distribution
21048 - Fix a memory leak when v3 directory authorities load their keys
21049 and cert from disk. Bugfix on 0.2.0.1-alpha.
21050 - Stop using malloc_usable_size() to use more area than we had
21051 actually allocated: it was safe, but made valgrind really unhappy.
21052 - Make the assert_circuit_ok() function work correctly on circuits that
21053 have already been marked for close.
21054 - Fix uninitialized size field for memory area allocation: may improve
21055 memory performance during directory parsing.
21057 o Minor bugfixes (clients):
21058 - Stop reloading the router list from disk for no reason when we
21059 run out of reachable directory mirrors. Once upon a time reloading
21060 it would set the 'is_running' flag back to 1 for them. It hasn't
21061 done that for a long time.
21062 - When we had picked an exit node for a connection, but marked it as
21063 "optional", and it turned out we had no onion key for the exit,
21064 stop wanting that exit and try again. This situation may not
21065 be possible now, but will probably become feasible with proposal
21066 158. Spotted by rovv. Fixes another case of bug 752.
21067 - Fix a bug in address parsing that was preventing bridges or hidden
21068 service targets from being at IPv6 addresses.
21069 - Do not remove routers as too old if we do not have any consensus
21070 document. Bugfix on 0.2.0.7-alpha.
21071 - When an exit relay resolves a stream address to a local IP address,
21072 do not just keep retrying that same exit relay over and
21073 over. Instead, just close the stream. Addresses bug 872. Bugfix
21074 on 0.2.0.32. Patch from rovv.
21075 - Made Tor a little less aggressive about deleting expired
21076 certificates. Partial fix for bug 854.
21077 - Treat duplicate certificate fetches as failures, so that we do
21078 not try to re-fetch an expired certificate over and over and over.
21079 - Do not say we're fetching a certificate when we'll in fact skip it
21080 because of a pending download.
21081 - If we have correct permissions on $datadir, we complain to stdout
21082 and fail to start. But dangerous permissions on
21083 $datadir/cached-status/ would cause us to open a log and complain
21084 there. Now complain to stdout and fail to start in both cases. Fixes
21085 bug 820, reported by seeess.
21087 o Minor bugfixes (bridges):
21088 - When we made bridge authorities stop serving bridge descriptors over
21089 unencrypted links, we also broke DirPort reachability testing for
21090 bridges. So bridges with a non-zero DirPort were printing spurious
21091 warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
21092 - Don't allow a bridge to publish its router descriptor to a
21093 non-bridge directory authority. Fixes part of bug 932.
21094 - When we change to or from being a bridge, reset our counts of
21095 client usage by country. Fixes bug 932.
21097 o Minor bugfixes (relays):
21098 - Log correct error messages for DNS-related network errors on
21100 - Actually return -1 in the error case for read_bandwidth_usage().
21101 Harmless bug, since we currently don't care about the return value
21102 anywhere. Bugfix on 0.2.0.9-alpha.
21103 - Provide a more useful log message if bug 977 (related to buffer
21104 freelists) ever reappears, and do not crash right away.
21105 - We were already rejecting relay begin cells with destination port
21106 of 0. Now also reject extend cells with destination port or address
21107 of 0. Suggested by lark.
21108 - When we can't transmit a DNS request due to a network error, retry
21109 it after a while, and eventually transmit a failing response to
21110 the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
21111 - Solve a bug that kept hardware crypto acceleration from getting
21112 enabled when accounting was turned on. Fixes bug 907. Bugfix on
21114 - When a canonical connection appears later in our internal list
21115 than a noncanonical one for a given OR ID, always use the
21116 canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
21118 - Avoid some nasty corner cases in the logic for marking connections
21119 as too old or obsolete or noncanonical for circuits. Partial
21121 - Fix another interesting corner-case of bug 891 spotted by rovv:
21122 Previously, if two hosts had different amounts of clock drift, and
21123 one of them created a new connection with just the wrong timing,
21124 the other might decide to deprecate the new connection erroneously.
21125 Bugfix on 0.1.1.13-alpha.
21126 - If one win32 nameserver fails to get added, continue adding the
21127 rest, and don't automatically fail.
21128 - Fix a bug where an unreachable relay would establish enough
21129 reachability testing circuits to do a bandwidth test -- if
21130 we already have a connection to the middle hop of the testing
21131 circuit, then it could establish the last hop by using the existing
21132 connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
21133 circuits no longer use entry guards in 0.2.1.3-alpha.
21135 o Minor bugfixes (directory authorities):
21136 - Limit uploaded directory documents to be 16M rather than 500K.
21137 The directory authorities were refusing v3 consensus votes from
21138 other authorities, since the votes are now 504K. Fixes bug 959;
21139 bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
21140 - Directory authorities should never send a 503 "busy" response to
21141 requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
21143 - Fix code so authorities _actually_ send back X-Descriptor-Not-New
21144 headers. Bugfix on 0.2.0.10-alpha.
21146 o Minor bugfixes (hidden services):
21147 - When we can't find an intro key for a v2 hidden service descriptor,
21148 fall back to the v0 hidden service descriptor and log a bug message.
21149 Workaround for bug 1024.
21150 - In very rare situations new hidden service descriptors were
21151 published earlier than 30 seconds after the last change to the
21152 service. (We currently think that a hidden service descriptor
21153 that's been stable for 30 seconds is worth publishing.)
21154 - If a hidden service sends us an END cell, do not consider
21155 retrying the connection; just close it. Patch from rovv.
21156 - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
21157 service directories if they have no advertised dir port. Bugfix
21160 o Minor bugfixes (tools):
21161 - In the torify(1) manpage, mention that tsocks will leak your
21164 o Minor bugfixes (controllers):
21165 - If the controller claimed responsibility for a stream, but that
21166 stream never finished making its connection, it would live
21167 forever in circuit_wait state. Now we close it after SocksTimeout
21168 seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
21169 - Make DNS resolved controller events into "CLOSED", not
21170 "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
21172 - The control port would close the connection before flushing long
21173 replies, such as the network consensus, if a QUIT command was issued
21174 before the reply had completed. Now, the control port flushes all
21175 pending replies before closing the connection. Also fix a spurious
21176 warning when a QUIT command is issued after a malformed or rejected
21177 AUTHENTICATE command, but before the connection was closed. Patch
21178 by Marcus Griep. Fixes bugs 1015 and 1016.
21179 - Fix a bug that made stream bandwidth get misreported to the
21182 o Deprecated and removed features:
21183 - The old "tor --version --version" command, which would print out
21184 the subversion "Id" of most of the source files, is now removed. It
21185 turned out to be less useful than we'd expected, and harder to
21187 - RedirectExits has been removed. It was deprecated since
21189 - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
21190 has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
21191 - Cell pools are now always enabled; --disable-cell-pools is ignored.
21192 - Directory mirrors no longer fetch the v1 directory or
21193 running-routers files. They are obsolete, and nobody asks for them
21194 anymore. This is the first step to making v1 authorities obsolete.
21195 - Take out the TestVia config option, since it was a workaround for
21196 a bug that was fixed in Tor 0.1.1.21.
21197 - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
21198 HiddenServiceExcludeNodes as obsolete: they never worked properly,
21199 and nobody seems to be using them. Fixes bug 754. Bugfix on
21200 0.1.0.1-rc. Patch from Christian Wilms.
21201 - Remove all backward-compatibility code for relays running
21202 versions of Tor so old that they no longer work at all on the
21205 o Code simplifications and refactoring:
21206 - Tool-assisted documentation cleanup. Nearly every function or
21207 static variable in Tor should have its own documentation now.
21208 - Rename the confusing or_is_obsolete field to the more appropriate
21209 is_bad_for_new_circs, and move it to or_connection_t where it
21211 - Move edge-only flags from connection_t to edge_connection_t: not
21212 only is this better coding, but on machines of plausible alignment,
21213 it should save 4-8 bytes per connection_t. "Every little bit helps."
21214 - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
21215 for consistency; keep old option working for backward compatibility.
21216 - Simplify the code for finding connections to use for a circuit.
21217 - Revise the connection_new functions so that a more typesafe variant
21218 exists. This will work better with Coverity, and let us find any
21219 actual mistakes we're making here.
21220 - Refactor unit testing logic so that dmalloc can be used sensibly
21221 with unit tests to check for memory leaks.
21222 - Move all hidden-service related fields from connection and circuit
21223 structure to substructures: this way they won't eat so much memory.
21224 - Squeeze 2-5% out of client performance (according to oprofile) by
21225 improving the implementation of some policy-manipulation functions.
21226 - Change the implementation of ExcludeNodes and ExcludeExitNodes to
21227 be more efficient. Formerly it was quadratic in the number of
21228 servers; now it should be linear. Fixes bug 509.
21229 - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
21230 and n_conn_id_digest fields into a separate structure that's
21231 only needed when the circuit has not yet attached to an n_conn.
21232 - Optimize out calls to time(NULL) that occur for every IO operation,
21233 or for every cell. On systems like Windows where time() is a
21234 slow syscall, this fix will be slightly helpful.
21237 Changes in version 0.2.0.35 - 2009-06-24
21239 - Avoid crashing in the presence of certain malformed descriptors.
21240 Found by lark, and by automated fuzzing.
21241 - Fix an edge case where a malicious exit relay could convince a
21242 controller that the client's DNS question resolves to an internal IP
21243 address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
21246 - Finally fix the bug where dynamic-IP relays disappear when their
21247 IP address changes: directory mirrors were mistakenly telling
21248 them their old address if they asked via begin_dir, so they
21249 never got an accurate answer about their new address, so they
21250 just vanished after a day. For belt-and-suspenders, relays that
21251 don't set Address in their config now avoid using begin_dir for
21252 all direct connections. Should fix bugs 827, 883, and 900.
21253 - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
21254 that would occur on some exit nodes when DNS failures and timeouts
21255 occurred in certain patterns. Fix for bug 957.
21258 - When starting with a cache over a few days old, do not leak
21259 memory for the obsolete router descriptors in it. Bugfix on
21260 0.2.0.33; fixes bug 672.
21261 - Hidden service clients didn't use a cached service descriptor that
21262 was older than 15 minutes, but wouldn't fetch a new one either,
21263 because there was already one in the cache. Now, fetch a v2
21264 descriptor unless the same descriptor was added to the cache within
21265 the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
21268 Changes in version 0.2.0.34 - 2009-02-08
21269 Tor 0.2.0.34 features several more security-related fixes. You should
21270 upgrade, especially if you run an exit relay (remote crash) or a
21271 directory authority (remote infinite loop), or you're on an older
21272 (pre-XP) or not-recently-patched Windows (remote exploit).
21274 This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
21275 have many known flaws, and nobody should be using them. You should
21276 upgrade. If you're using a Linux or BSD and its packages are obsolete,
21277 stop using those packages and upgrade anyway.
21280 - Fix an infinite-loop bug on handling corrupt votes under certain
21281 circumstances. Bugfix on 0.2.0.8-alpha.
21282 - Fix a temporary DoS vulnerability that could be performed by
21283 a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
21284 - Avoid a potential crash on exit nodes when processing malformed
21285 input. Remote DoS opportunity. Bugfix on 0.2.0.33.
21286 - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
21287 Spec conformance issue. Bugfix on Tor 0.0.2pre27.
21290 - Fix compilation on systems where time_t is a 64-bit integer.
21291 Patch from Matthias Drochner.
21292 - Don't consider expiring already-closed client connections. Fixes
21293 bug 893. Bugfix on 0.0.2pre20.
21296 Changes in version 0.2.0.33 - 2009-01-21
21297 Tor 0.2.0.33 fixes a variety of bugs that were making relays less
21298 useful to users. It also finally fixes a bug where a relay or client
21299 that's been off for many days would take a long time to bootstrap.
21301 This update also fixes an important security-related bug reported by
21302 Ilja van Sprundel. You should upgrade. (We'll send out more details
21303 about the bug once people have had some time to upgrade.)
21306 - Fix a heap-corruption bug that may be remotely triggerable on
21307 some platforms. Reported by Ilja van Sprundel.
21310 - When a stream at an exit relay is in state "resolving" or
21311 "connecting" and it receives an "end" relay cell, the exit relay
21312 would silently ignore the end cell and not close the stream. If
21313 the client never closes the circuit, then the exit relay never
21314 closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
21315 reported by "wood".
21316 - When sending CREATED cells back for a given circuit, use a 64-bit
21317 connection ID to find the right connection, rather than an addr:port
21318 combination. Now that we can have multiple OR connections between
21319 the same ORs, it is no longer possible to use addr:port to uniquely
21320 identify a connection.
21321 - Bridge relays that had DirPort set to 0 would stop fetching
21322 descriptors shortly after startup, and then briefly resume
21323 after a new bandwidth test and/or after publishing a new bridge
21324 descriptor. Bridge users that try to bootstrap from them would
21325 get a recent networkstatus but would get descriptors from up to
21326 18 hours earlier, meaning most of the descriptors were obsolete
21327 already. Reported by Tas; bugfix on 0.2.0.13-alpha.
21328 - Prevent bridge relays from serving their 'extrainfo' document
21329 to anybody who asks, now that extrainfo docs include potentially
21330 sensitive aggregated client geoip summaries. Bugfix on
21332 - If the cached networkstatus consensus is more than five days old,
21333 discard it rather than trying to use it. In theory it could be
21334 useful because it lists alternate directory mirrors, but in practice
21335 it just means we spend many minutes trying directory mirrors that
21336 are long gone from the network. Also discard router descriptors as
21337 we load them if they are more than five days old, since the onion
21338 key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
21341 - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
21342 could make gcc generate non-functional binary search code. Bugfix
21344 - Build correctly on platforms without socklen_t.
21345 - Compile without warnings on solaris.
21346 - Avoid potential crash on internal error during signature collection.
21347 Fixes bug 864. Patch from rovv.
21348 - Correct handling of possible malformed authority signing key
21349 certificates with internal signature types. Fixes bug 880.
21350 Bugfix on 0.2.0.3-alpha.
21351 - Fix a hard-to-trigger resource leak when logging credential status.
21353 - When we can't initialize DNS because the network is down, do not
21354 automatically stop Tor from starting. Instead, we retry failed
21355 dns_init() every 10 minutes, and change the exit policy to reject
21356 *:* until one succeeds. Fixes bug 691.
21357 - Use 64 bits instead of 32 bits for connection identifiers used with
21358 the controller protocol, to greatly reduce risk of identifier reuse.
21359 - When we're choosing an exit node for a circuit, and we have
21360 no pending streams, choose a good general exit rather than one that
21361 supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
21362 - Fix another case of assuming, when a specific exit is requested,
21363 that we know more than the user about what hosts it allows.
21364 Fixes one case of bug 752. Patch from rovv.
21365 - Clip the MaxCircuitDirtiness config option to a minimum of 10
21366 seconds. Warn the user if lower values are given in the
21367 configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
21368 - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
21369 user if lower values are given in the configuration. Bugfix on
21370 0.1.1.17-rc. Patch by Sebastian.
21371 - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
21372 the cache because we already had a v0 descriptor with the same ID.
21373 Bugfix on 0.2.0.18-alpha.
21374 - Fix a race condition when freeing keys shared between main thread
21375 and CPU workers that could result in a memory leak. Bugfix on
21376 0.1.0.1-rc. Fixes bug 889.
21377 - Send a valid END cell back when a client tries to connect to a
21378 nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
21379 840. Patch from rovv.
21380 - Check which hops rendezvous stream cells are associated with to
21381 prevent possible guess-the-streamid injection attacks from
21382 intermediate hops. Fixes another case of bug 446. Based on patch
21384 - If a broken client asks a non-exit router to connect somewhere,
21385 do not even do the DNS lookup before rejecting the connection.
21386 Fixes another case of bug 619. Patch from rovv.
21387 - When a relay gets a create cell it can't decrypt (e.g. because it's
21388 using the wrong onion key), we were dropping it and letting the
21389 client time out. Now actually answer with a destroy cell. Fixes
21390 bug 904. Bugfix on 0.0.2pre8.
21392 o Minor bugfixes (hidden services):
21393 - Do not throw away existing introduction points on SIGHUP. Bugfix on
21394 0.0.6pre1. Patch by Karsten. Fixes bug 874.
21397 - Report the case where all signatures in a detached set are rejected
21398 differently than the case where there is an error handling the
21400 - When we realize that another process has modified our cached
21401 descriptors, print out a more useful error message rather than
21402 triggering an assertion. Fixes bug 885. Patch from Karsten.
21403 - Implement the 0x20 hack to better resist DNS poisoning: set the
21404 case on outgoing DNS requests randomly, and reject responses that do
21405 not match the case correctly. This logic can be disabled with the
21406 ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
21407 of servers that do not reliably preserve case in replies. See
21408 "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
21410 - Check DNS replies for more matching fields to better resist DNS
21412 - Never use OpenSSL compression: it wastes RAM and CPU trying to
21413 compress cells, which are basically all encrypted, compressed, or
21417 Changes in version 0.2.0.32 - 2008-11-20
21418 Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
21419 packages (and maybe other packages) noticed by Theo de Raadt, fixes
21420 a smaller security flaw that might allow an attacker to access local
21421 services, further improves hidden service performance, and fixes a
21422 variety of other issues.
21425 - The "User" and "Group" config options did not clear the
21426 supplementary group entries for the Tor process. The "User" option
21427 is now more robust, and we now set the groups to the specified
21428 user's primary group. The "Group" option is now ignored. For more
21429 detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
21430 in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
21431 and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
21432 - The "ClientDNSRejectInternalAddresses" config option wasn't being
21433 consistently obeyed: if an exit relay refuses a stream because its
21434 exit policy doesn't allow it, we would remember what IP address
21435 the relay said the destination address resolves to, even if it's
21436 an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
21439 - Fix a DOS opportunity during the voting signature collection process
21440 at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
21442 o Major bugfixes (hidden services):
21443 - When fetching v0 and v2 rendezvous service descriptors in parallel,
21444 we were failing the whole hidden service request when the v0
21445 descriptor fetch fails, even if the v2 fetch is still pending and
21446 might succeed. Similarly, if the last v2 fetch fails, we were
21447 failing the whole hidden service request even if a v0 fetch is
21448 still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
21449 - When extending a circuit to a hidden service directory to upload a
21450 rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
21451 requests failed, because the router descriptor has not been
21452 downloaded yet. In these cases, do not attempt to upload the
21453 rendezvous descriptor, but wait until the router descriptor is
21454 downloaded and retry. Likewise, do not attempt to fetch a rendezvous
21455 descriptor from a hidden service directory for which the router
21456 descriptor has not yet been downloaded. Fixes bug 767. Bugfix
21460 - Fix several infrequent memory leaks spotted by Coverity.
21461 - When testing for libevent functions, set the LDFLAGS variable
21462 correctly. Found by Riastradh.
21463 - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
21464 bootstrapping with tunneled directory connections. Bugfix on
21465 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
21466 - When asked to connect to A.B.exit:80, if we don't know the IP for A
21467 and we know that server B rejects most-but-not all connections to
21468 port 80, we would previously reject the connection. Now, we assume
21469 the user knows what they were asking for. Fixes bug 752. Bugfix
21470 on 0.0.9rc5. Diagnosed by BarkerJr.
21471 - If we overrun our per-second write limits a little, count this as
21472 having used up our write allocation for the second, and choke
21473 outgoing directory writes. Previously, we had only counted this when
21474 we had met our limits precisely. Fixes bug 824. Patch from by rovv.
21475 Bugfix on 0.2.0.x (??).
21476 - Remove the old v2 directory authority 'lefkada' from the default
21477 list. It has been gone for many months.
21478 - Stop doing unaligned memory access that generated bus errors on
21479 sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
21480 - Make USR2 log-level switch take effect immediately. Bugfix on
21483 o Minor bugfixes (controller):
21484 - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
21485 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
21488 Changes in version 0.2.0.31 - 2008-09-03
21489 Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
21490 a big bug we're seeing where in rare cases traffic from one Tor stream
21491 gets mixed into another stream, and fixes a variety of smaller issues.
21494 - Make sure that two circuits can never exist on the same connection
21495 with the same circuit ID, even if one is marked for close. This
21496 is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
21497 - Relays now reject risky extend cells: if the extend cell includes
21498 a digest of all zeroes, or asks to extend back to the relay that
21499 sent the extend cell, tear down the circuit. Ideas suggested
21501 - If not enough of our entry guards are available so we add a new
21502 one, we might use the new one even if it overlapped with the
21503 current circuit's exit relay (or its family). Anonymity bugfix
21504 pointed out by rovv.
21507 - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
21508 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
21509 - Correctly detect the presence of the linux/netfilter_ipv4.h header
21510 when building against recent kernels. Bugfix on 0.1.2.1-alpha.
21511 - Pick size of default geoip filename string correctly on windows.
21512 Fixes bug 806. Bugfix on 0.2.0.30.
21513 - Make the autoconf script accept the obsolete --with-ssl-dir
21514 option as an alias for the actually-working --with-openssl-dir
21515 option. Fix the help documentation to recommend --with-openssl-dir.
21516 Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
21517 - When using the TransPort option on OpenBSD, and using the User
21518 option to change UID and drop privileges, make sure to open
21519 /dev/pf before dropping privileges. Fixes bug 782. Patch from
21520 Christopher Davis. Bugfix on 0.1.2.1-alpha.
21521 - Try to attach connections immediately upon receiving a RENDEZVOUS2
21522 or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
21523 on the client side when connecting to a hidden service. Bugfix
21524 on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
21525 - When closing an application-side connection because its circuit is
21526 getting torn down, generate the stream event correctly. Bugfix on
21527 0.1.2.x. Anonymous patch.
21530 Changes in version 0.2.0.30 - 2008-07-15
21531 This new stable release switches to a more efficient directory
21532 distribution design, adds features to make connections to the Tor
21533 network harder to block, allows Tor to act as a DNS proxy, adds separate
21534 rate limiting for relayed traffic to make it easier for clients to
21535 become relays, fixes a variety of potential anonymity problems, and
21536 includes the usual huge pile of other features and bug fixes.
21538 o New v3 directory design:
21539 - Tor now uses a new way to learn about and distribute information
21540 about the network: the directory authorities vote on a common
21541 network status document rather than each publishing their own
21542 opinion. Now clients and caches download only one networkstatus
21543 document to bootstrap, rather than downloading one for each
21544 authority. Clients only download router descriptors listed in
21545 the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
21547 - Set up moria1, tor26, and dizum as v3 directory authorities
21548 in addition to being v2 authorities. Also add three new ones:
21549 ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
21550 dannenberg (run by CCC).
21551 - Switch to multi-level keys for directory authorities: now their
21552 long-term identity key can be kept offline, and they periodically
21553 generate a new signing key. Clients fetch the "key certificates"
21554 to keep up to date on the right keys. Add a standalone tool
21555 "tor-gencert" to generate key certificates. Implements proposal 103.
21556 - Add a new V3AuthUseLegacyKey config option to make it easier for
21557 v3 authorities to change their identity keys if another bug like
21558 Debian's OpenSSL RNG flaw appears.
21559 - Authorities and caches fetch the v2 networkstatus documents
21560 less often, now that v3 is recommended.
21562 o Make Tor connections stand out less on the wire:
21563 - Use an improved TLS handshake designed by Steven Murdoch in proposal
21564 124, as revised in proposal 130. The new handshake is meant to
21565 be harder for censors to fingerprint, and it adds the ability
21566 to detect certain kinds of man-in-the-middle traffic analysis
21567 attacks. The new handshake format includes version negotiation for
21568 OR connections as described in proposal 105, which will allow us
21569 to improve Tor's link protocol more safely in the future.
21570 - Enable encrypted directory connections by default for non-relays,
21571 so censor tools that block Tor directory connections based on their
21572 plaintext patterns will no longer work. This means Tor works in
21573 certain censored countries by default again.
21574 - Stop including recognizeable strings in the commonname part of
21575 Tor's x509 certificates.
21577 o Implement bridge relays:
21578 - Bridge relays (or "bridges" for short) are Tor relays that aren't
21579 listed in the main Tor directory. Since there is no complete public
21580 list of them, even an ISP that is filtering connections to all the
21581 known Tor relays probably won't be able to block all the bridges.
21582 See doc/design-paper/blocking.pdf and proposal 125 for details.
21583 - New config option BridgeRelay that specifies you want to be a
21584 bridge relay rather than a normal relay. When BridgeRelay is set
21585 to 1, then a) you cache dir info even if your DirPort ins't on,
21586 and b) the default for PublishServerDescriptor is now "bridge"
21587 rather than "v2,v3".
21588 - New config option "UseBridges 1" for clients that want to use bridge
21589 relays instead of ordinary entry guards. Clients then specify
21590 bridge relays by adding "Bridge" lines to their config file. Users
21591 can learn about a bridge relay either manually through word of
21592 mouth, or by one of our rate-limited mechanisms for giving out
21593 bridge addresses without letting an attacker easily enumerate them
21594 all. See https://www.torproject.org/bridges for details.
21595 - Bridge relays behave like clients with respect to time intervals
21596 for downloading new v3 consensus documents -- otherwise they
21597 stand out. Bridge users now wait until the end of the interval,
21598 so their bridge relay will be sure to have a new consensus document.
21600 o Implement bridge directory authorities:
21601 - Bridge authorities are like normal directory authorities, except
21602 they don't serve a list of known bridges. Therefore users that know
21603 a bridge's fingerprint can fetch a relay descriptor for that bridge,
21604 including fetching updates e.g. if the bridge changes IP address,
21605 yet an attacker can't just fetch a list of all the bridges.
21606 - Set up Tonga as the default bridge directory authority.
21607 - Bridge authorities refuse to serve bridge descriptors or other
21608 bridge information over unencrypted connections (that is, when
21609 responding to direct DirPort requests rather than begin_dir cells.)
21610 - Bridge directory authorities do reachability testing on the
21611 bridges they know. They provide router status summaries to the
21612 controller via "getinfo ns/purpose/bridge", and also dump summaries
21613 to a file periodically, so we can keep internal stats about which
21614 bridges are functioning.
21615 - If bridge users set the UpdateBridgesFromAuthority config option,
21616 but the digest they ask for is a 404 on the bridge authority,
21617 they fall back to contacting the bridge directly.
21618 - Bridges always use begin_dir to publish their server descriptor to
21619 the bridge authority using an anonymous encrypted tunnel.
21620 - Early work on a "bridge community" design: if bridge authorities set
21621 the BridgePassword config option, they will serve a snapshot of
21622 known bridge routerstatuses from their DirPort to anybody who
21623 knows that password. Unset by default.
21624 - Tor now includes an IP-to-country GeoIP file, so bridge relays can
21625 report sanitized aggregated summaries in their extra-info documents
21626 privately to the bridge authority, listing which countries are
21627 able to reach them. We hope this mechanism will let us learn when
21628 certain countries start trying to block bridges.
21629 - Bridge authorities write bridge descriptors to disk, so they can
21630 reload them after a reboot. They can also export the descriptors
21631 to other programs, so we can distribute them to blocked users via
21632 the BridgeDB interface, e.g. via https://bridges.torproject.org/
21633 and bridges@torproject.org.
21635 o Tor can be a DNS proxy:
21636 - The new client-side DNS proxy feature replaces the need for
21637 dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
21638 for DNS requests on port 9999, use the Tor network to resolve them
21639 anonymously, and send the reply back like a regular DNS server.
21640 The code still only implements a subset of DNS.
21641 - Add a new AutomapHostsOnResolve option: when it is enabled, any
21642 resolve request for hosts matching a given pattern causes Tor to
21643 generate an internal virtual address mapping for that host. This
21644 allows DNSPort to work sensibly with hidden service users. By
21645 default, .exit and .onion addresses are remapped; the list of
21646 patterns can be reconfigured with AutomapHostsSuffixes.
21647 - Add an "-F" option to tor-resolve to force a resolve for a .onion
21648 address. Thanks to the AutomapHostsOnResolve option, this is no
21649 longer a completely silly thing to do.
21651 o Major features (relay usability):
21652 - New config options RelayBandwidthRate and RelayBandwidthBurst:
21653 a separate set of token buckets for relayed traffic. Right now
21654 relayed traffic is defined as answers to directory requests, and
21655 OR connections that don't have any local circuits on them. See
21656 proposal 111 for details.
21657 - Create listener connections before we setuid to the configured
21658 User and Group. Now non-Windows users can choose port values
21659 under 1024, start Tor as root, and have Tor bind those ports
21660 before it changes to another UID. (Windows users could already
21662 - Added a new ConstrainedSockets config option to set SO_SNDBUF and
21663 SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
21664 on "vserver" accounts. Patch from coderman.
21666 o Major features (directory authorities):
21667 - Directory authorities track weighted fractional uptime and weighted
21668 mean-time-between failures for relays. WFU is suitable for deciding
21669 whether a node is "usually up", while MTBF is suitable for deciding
21670 whether a node is "likely to stay up." We need both, because
21671 "usually up" is a good requirement for guards, while "likely to
21672 stay up" is a good requirement for long-lived connections.
21673 - Directory authorities use a new formula for selecting which relays
21674 to advertise as Guards: they must be in the top 7/8 in terms of
21675 how long we have known about them, and above the median of those
21676 nodes in terms of weighted fractional uptime.
21677 - Directory authorities use a new formula for selecting which relays
21678 to advertise as Stable: when we have 4 or more days of data, use
21679 median measured MTBF rather than median declared uptime. Implements
21681 - Directory authorities accept and serve "extra info" documents for
21682 routers. Routers now publish their bandwidth-history lines in the
21683 extra-info docs rather than the main descriptor. This step saves
21684 60% (!) on compressed router descriptor downloads. Servers upload
21685 extra-info docs to any authority that accepts them; directory
21686 authorities now allow multiple router descriptors and/or extra
21687 info documents to be uploaded in a single go. Authorities, and
21688 caches that have been configured to download extra-info documents,
21689 download them as needed. Implements proposal 104.
21690 - Authorities now list relays who have the same nickname as
21691 a different named relay, but list them with a new flag:
21692 "Unnamed". Now we can make use of relays that happen to pick the
21693 same nickname as a server that registered two years ago and then
21694 disappeared. Implements proposal 122.
21695 - Store routers in a file called cached-descriptors instead of in
21696 cached-routers. Initialize cached-descriptors from cached-routers
21697 if the old format is around. The new format allows us to store
21698 annotations along with descriptors, to record the time we received
21699 each descriptor, its source, and its purpose: currently one of
21700 general, controller, or bridge.
21702 o Major features (other):
21703 - New config options WarnPlaintextPorts and RejectPlaintextPorts so
21704 Tor can warn and/or refuse connections to ports commonly used with
21705 vulnerable-plaintext protocols. Currently we warn on ports 23,
21706 109, 110, and 143, but we don't reject any. Based on proposal 129
21707 by Kevin Bauer and Damon McCoy.
21708 - Integrate Karsten Loesing's Google Summer of Code project to publish
21709 hidden service descriptors on a set of redundant relays that are a
21710 function of the hidden service address. Now we don't have to rely
21711 on three central hidden service authorities for publishing and
21712 fetching every hidden service descriptor. Implements proposal 114.
21713 - Allow tunnelled directory connections to ask for an encrypted
21714 "begin_dir" connection or an anonymized "uses a full Tor circuit"
21715 connection independently. Now we can make anonymized begin_dir
21716 connections for (e.g.) more secure hidden service posting and
21719 o Major bugfixes (crashes and assert failures):
21720 - Stop imposing an arbitrary maximum on the number of file descriptors
21721 used for busy servers. Bug reported by Olaf Selke; patch from
21723 - Avoid possible failures when generating a directory with routers
21724 with over-long versions strings, or too many flags set.
21725 - Fix a rare assert error when we're closing one of our threads:
21726 use a mutex to protect the list of logs, so we never write to the
21727 list as it's being freed. Fixes the very rare bug 575, which is
21728 kind of the revenge of bug 222.
21729 - Avoid segfault in the case where a badly behaved v2 versioning
21730 directory sends a signed networkstatus with missing client-versions.
21731 - When we hit an EOF on a log (probably because we're shutting down),
21732 don't try to remove the log from the list: just mark it as
21733 unusable. (Bulletproofs against bug 222.)
21735 o Major bugfixes (code security fixes):
21736 - Detect size overflow in zlib code. Reported by Justin Ferguson and
21738 - Rewrite directory tokenization code to never run off the end of
21739 a string. Fixes bug 455. Patch from croup.
21740 - Be more paranoid about overwriting sensitive memory on free(),
21741 as a defensive programming tactic to ensure forward secrecy.
21743 o Major bugfixes (anonymity fixes):
21744 - Reject requests for reverse-dns lookup of names that are in
21745 a private address space. Patch from lodger.
21746 - Never report that we've used more bandwidth than we're willing to
21747 relay: it leaks how much non-relay traffic we're using. Resolves
21749 - As a client, do not believe any server that tells us that an
21750 address maps to an internal address space.
21751 - Warn about unsafe ControlPort configurations.
21752 - Directory authorities now call routers Fast if their bandwidth is
21753 at least 100KB/s, and consider their bandwidth adequate to be a
21754 Guard if it is at least 250KB/s, no matter the medians. This fix
21755 complements proposal 107.
21756 - Directory authorities now never mark more than 2 servers per IP as
21757 Valid and Running (or 5 on addresses shared by authorities).
21758 Implements proposal 109, by Kevin Bauer and Damon McCoy.
21759 - If we're a relay, avoid picking ourselves as an introduction point,
21760 a rendezvous point, or as the final hop for internal circuits. Bug
21761 reported by taranis and lodger.
21762 - Exit relays that are used as a client can now reach themselves
21763 using the .exit notation, rather than just launching an infinite
21764 pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
21765 - Fix a bug where, when we were choosing the 'end stream reason' to
21766 put in our relay end cell that we send to the exit relay, Tor
21767 clients on Windows were sometimes sending the wrong 'reason'. The
21768 anonymity problem is that exit relays may be able to guess whether
21769 the client is running Windows, thus helping partition the anonymity
21770 set. Down the road we should stop sending reasons to exit relays,
21771 or otherwise prevent future versions of this bug.
21772 - Only update guard status (usable / not usable) once we have
21773 enough directory information. This was causing us to discard all our
21774 guards on startup if we hadn't been running for a few weeks. Fixes
21776 - When our directory information has been expired for a while, stop
21777 being willing to build circuits using it. Fixes bug 401.
21779 o Major bugfixes (peace of mind for relay operators)
21780 - Non-exit relays no longer answer "resolve" relay cells, so they
21781 can't be induced to do arbitrary DNS requests. (Tor clients already
21782 avoid using non-exit relays for resolve cells, but now servers
21783 enforce this too.) Fixes bug 619. Patch from lodger.
21784 - When we setconf ClientOnly to 1, close any current OR and Dir
21785 listeners. Reported by mwenge.
21787 o Major bugfixes (other):
21788 - If we only ever used Tor for hidden service lookups or posts, we
21789 would stop building circuits and start refusing connections after
21790 24 hours, since we falsely believed that Tor was dormant. Reported
21792 - Add a new __HashedControlSessionPassword option for controllers
21793 to use for one-off session password hashes that shouldn't get
21794 saved to disk by SAVECONF --- Vidalia users were accumulating a
21795 pile of HashedControlPassword lines in their torrc files, one for
21796 each time they had restarted Tor and then clicked Save. Make Tor
21797 automatically convert "HashedControlPassword" to this new option but
21798 only when it's given on the command line. Partial fix for bug 586.
21799 - Patch from "Andrew S. Lists" to catch when we contact a directory
21800 mirror at IP address X and he says we look like we're coming from
21801 IP address X. Otherwise this would screw up our address detection.
21802 - Reject uploaded descriptors and extrainfo documents if they're
21803 huge. Otherwise we'll cache them all over the network and it'll
21804 clog everything up. Suggested by Aljosha Judmayer.
21805 - When a hidden service was trying to establish an introduction point,
21806 and Tor *did* manage to reuse one of the preemptively built
21807 circuits, it didn't correctly remember which one it used,
21808 so it asked for another one soon after, until there were no
21809 more preemptive circuits, at which point it launched one from
21810 scratch. Bugfix on 0.0.9.x.
21812 o Rate limiting and load balancing improvements:
21813 - When we add data to a write buffer in response to the data on that
21814 write buffer getting low because of a flush, do not consider the
21815 newly added data as a candidate for immediate flushing, but rather
21816 make it wait until the next round of writing. Otherwise, we flush
21817 and refill recursively, and a single greedy TLS connection can
21818 eat all of our bandwidth.
21819 - When counting the number of bytes written on a TLS connection,
21820 look at the BIO actually used for writing to the network, not
21821 at the BIO used (sometimes) to buffer data for the network.
21822 Looking at different BIOs could result in write counts on the
21823 order of ULONG_MAX. Fixes bug 614.
21824 - If we change our MaxAdvertisedBandwidth and then reload torrc,
21825 Tor won't realize it should publish a new relay descriptor. Fixes
21826 bug 688, reported by mfr.
21827 - Avoid using too little bandwidth when our clock skips a few seconds.
21828 - Choose which bridge to use proportional to its advertised bandwidth,
21829 rather than uniformly at random. This should speed up Tor for
21830 bridge users. Also do this for people who set StrictEntryNodes.
21832 o Bootstrapping faster and building circuits more intelligently:
21833 - Fix bug 660 that was preventing us from knowing that we should
21834 preemptively build circuits to handle expected directory requests.
21835 - When we're checking if we have enough dir info for each relay
21836 to begin establishing circuits, make sure that we actually have
21837 the descriptor listed in the consensus, not just any descriptor.
21838 - Correctly notify one-hop connections when a circuit build has
21839 failed. Possible fix for bug 669. Found by lodger.
21840 - Clients now hold circuitless TLS connections open for 1.5 times
21841 MaxCircuitDirtiness (15 minutes), since it is likely that they'll
21842 rebuild a new circuit over them within that timeframe. Previously,
21843 they held them open only for KeepalivePeriod (5 minutes).
21845 o Performance improvements (memory):
21846 - Add OpenBSD malloc code from "phk" as an optional malloc
21847 replacement on Linux: some glibc libraries do very poorly with
21848 Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
21849 ./configure to get the replacement malloc code.
21850 - Switch our old ring buffer implementation for one more like that
21851 used by free Unix kernels. The wasted space in a buffer with 1mb
21852 of data will now be more like 8k than 1mb. The new implementation
21853 also avoids realloc();realloc(); patterns that can contribute to
21854 memory fragmentation.
21855 - Change the way that Tor buffers data that it is waiting to write.
21856 Instead of queueing data cells in an enormous ring buffer for each
21857 client->OR or OR->OR connection, we now queue cells on a separate
21858 queue for each circuit. This lets us use less slack memory, and
21859 will eventually let us be smarter about prioritizing different kinds
21861 - Reference-count and share copies of address policy entries; only 5%
21862 of them were actually distinct.
21863 - Tune parameters for cell pool allocation to minimize amount of
21865 - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
21866 for every single inactive connection_t. Free items from the
21867 4k/16k-buffer free lists when they haven't been used for a while.
21868 - Make memory debugging information describe more about history
21869 of cell allocation, so we can help reduce our memory use.
21870 - Be even more aggressive about releasing RAM from small
21871 empty buffers. Thanks to our free-list code, this shouldn't be too
21872 performance-intensive.
21873 - Log malloc statistics from mallinfo() on platforms where it exists.
21874 - Use memory pools to allocate cells with better speed and memory
21875 efficiency, especially on platforms where malloc() is inefficient.
21876 - Add a --with-tcmalloc option to the configure script to link
21877 against tcmalloc (if present). Does not yet search for non-system
21880 o Performance improvements (socket management):
21881 - Count the number of open sockets separately from the number of
21882 active connection_t objects. This will let us avoid underusing
21883 our allocated connection limit.
21884 - We no longer use socket pairs to link an edge connection to an
21885 anonymous directory connection or a DirPort test connection.
21886 Instead, we track the link internally and transfer the data
21887 in-process. This saves two sockets per "linked" connection (at the
21888 client and at the server), and avoids the nasty Windows socketpair()
21890 - We were leaking a file descriptor if Tor started with a zero-length
21891 cached-descriptors file. Patch by "freddy77".
21893 o Performance improvements (CPU use):
21894 - Never walk through the list of logs if we know that no log target
21895 is interested in a given message.
21896 - Call routerlist_remove_old_routers() much less often. This should
21897 speed startup, especially on directory caches.
21898 - Base64 decoding was actually showing up on our profile when parsing
21899 the initial descriptor file; switch to an in-process all-at-once
21900 implementation that's about 3.5x times faster than calling out to
21902 - Use a slightly simpler string hashing algorithm (copying Python's
21903 instead of Java's) and optimize our digest hashing algorithm to take
21904 advantage of 64-bit platforms and to remove some possibly-costly
21906 - When implementing AES counter mode, update only the portions of the
21907 counter buffer that need to change, and don't keep separate
21908 network-order and host-order counters on big-endian hosts (where
21909 they are the same).
21910 - Add an in-place version of aes_crypt() so that we can avoid doing a
21911 needless memcpy() call on each cell payload.
21912 - Use Critical Sections rather than Mutexes for synchronizing threads
21913 on win32; Mutexes are heavier-weight, and designed for synchronizing
21916 o Performance improvements (bandwidth use):
21917 - Don't try to launch new descriptor downloads quite so often when we
21918 already have enough directory information to build circuits.
21919 - Version 1 directories are no longer generated in full. Instead,
21920 authorities generate and serve "stub" v1 directories that list
21921 no servers. This will stop Tor versions 0.1.0.x and earlier from
21922 working, but (for security reasons) nobody should be running those
21924 - Avoid going directly to the directory authorities even if you're a
21925 relay, if you haven't found yourself reachable yet or if you've
21926 decided not to advertise your dirport yet. Addresses bug 556.
21927 - If we've gone 12 hours since our last bandwidth check, and we
21928 estimate we have less than 50KB bandwidth capacity but we could
21929 handle more, do another bandwidth test.
21930 - Support "If-Modified-Since" when answering HTTP requests for
21931 directories, running-routers documents, and v2 and v3 networkstatus
21932 documents. (There's no need to support it for router descriptors,
21933 since those are downloaded by descriptor digest.)
21934 - Stop fetching directory info so aggressively if your DirPort is
21935 on but your ORPort is off; stop fetching v2 dir info entirely.
21936 You can override these choices with the new FetchDirInfoEarly
21939 o Changed config option behavior (features):
21940 - Configuration files now accept C-style strings as values. This
21941 helps encode characters not allowed in the current configuration
21942 file format, such as newline or #. Addresses bug 557.
21943 - Add hidden services and DNSPorts to the list of things that make
21944 Tor accept that it has running ports. Change starting Tor with no
21945 ports from a fatal error to a warning; we might change it back if
21946 this turns out to confuse anybody. Fixes bug 579.
21947 - Make PublishServerDescriptor default to 1, so the default doesn't
21948 have to change as we invent new directory protocol versions.
21949 - Allow people to say PreferTunnelledDirConns rather than
21950 PreferTunneledDirConns, for those alternate-spellers out there.
21951 - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
21952 accommodate the growing number of servers that use the default
21953 and are reaching it.
21954 - Make it possible to enable HashedControlPassword and
21955 CookieAuthentication at the same time.
21956 - When a TrackHostExits-chosen exit fails too many times in a row,
21957 stop using it. Fixes bug 437.
21959 o Changed config option behavior (bugfixes):
21960 - Do not read the configuration file when we've only been told to
21961 generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
21962 based on patch from Sebastian Hahn.
21963 - Actually validate the options passed to AuthDirReject,
21964 AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
21965 - Make "ClientOnly 1" config option disable directory ports too.
21966 - Don't stop fetching descriptors when FetchUselessDescriptors is
21967 set, even if we stop asking for circuits. Bug reported by tup
21969 - Servers used to decline to publish their DirPort if their
21970 BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
21971 they look only at BandwidthRate and RelayBandwidthRate.
21972 - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
21973 minus 1 byte: the actual maximum declared bandwidth.
21974 - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
21975 - Make the NodeFamilies config option work. (Reported by
21976 lodger -- it has never actually worked, even though we added it
21978 - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
21979 now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
21981 o New config options:
21982 - New configuration options AuthDirMaxServersPerAddr and
21983 AuthDirMaxServersperAuthAddr to override default maximum number
21984 of servers allowed on a single IP address. This is important for
21985 running a test network on a single host.
21986 - Three new config options (AlternateDirAuthority,
21987 AlternateBridgeAuthority, and AlternateHSAuthority) that let the
21988 user selectively replace the default directory authorities by type,
21989 rather than the all-or-nothing replacement that DirServer offers.
21990 - New config options AuthDirBadDir and AuthDirListBadDirs for
21991 authorities to mark certain relays as "bad directories" in the
21992 networkstatus documents. Also supports the "!baddir" directive in
21993 the approved-routers file.
21994 - New config option V2AuthoritativeDirectory that all v2 directory
21995 authorities must set. This lets v3 authorities choose not to serve
21996 v2 directory information.
21998 o Minor features (other):
21999 - When we're not serving v2 directory information, there is no reason
22000 to actually keep any around. Remove the obsolete files and directory
22001 on startup if they are very old and we aren't going to serve them.
22002 - When we negotiate a v2 link-layer connection (not yet implemented),
22003 accept RELAY_EARLY cells and turn them into RELAY cells if we've
22004 negotiated a v1 connection for their next step. Initial steps for
22006 - When we have no consensus, check FallbackNetworkstatusFile (defaults
22007 to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
22008 we can start out knowing some directory caches. We don't ship with
22009 a fallback consensus by default though, because it was making
22010 bootstrapping take too long while we tried many down relays.
22011 - Authorities send back an X-Descriptor-Not-New header in response to
22012 an accepted-but-discarded descriptor upload. Partially implements
22014 - If we find a cached-routers file that's been sitting around for more
22015 than 28 days unmodified, then most likely it's a leftover from
22016 when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
22018 - When we (as a cache) download a descriptor because it was listed
22019 in a consensus, remember when the consensus was supposed to expire,
22020 and don't expire the descriptor until then.
22021 - Optionally (if built with -DEXPORTMALLINFO) export the output
22022 of mallinfo via http, as tor/mallinfo.txt. Only accessible
22024 - Tag every guard node in our state file with the version that
22025 we believe added it, or with our own version if we add it. This way,
22026 if a user temporarily runs an old version of Tor and then switches
22027 back to a new one, she doesn't automatically lose her guards.
22028 - When somebody requests a list of statuses or servers, and we have
22029 none of those, return a 404 rather than an empty 200.
22030 - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
22032 - Add an HSAuthorityRecordStats option that hidden service authorities
22033 can use to track statistics of overall hidden service usage without
22034 logging information that would be as useful to an attacker.
22035 - Allow multiple HiddenServicePort directives with the same virtual
22036 port; when they occur, the user is sent round-robin to one
22037 of the target ports chosen at random. Partially fixes bug 393 by
22038 adding limited ad-hoc round-robining.
22039 - Revamp file-writing logic so we don't need to have the entire
22040 contents of a file in memory at once before we write to disk. Tor,
22043 o Minor bugfixes (other):
22044 - Alter the code that tries to recover from unhandled write
22045 errors, to not try to flush onto a socket that's given us
22047 - Directory mirrors no longer include a guess at the client's IP
22048 address if the connection appears to be coming from the same /24
22049 network; it was producing too many wrong guesses.
22050 - If we're trying to flush the last bytes on a connection (for
22051 example, when answering a directory request), reset the
22052 time-to-give-up timeout every time we manage to write something
22054 - Reject router descriptors with out-of-range bandwidthcapacity or
22055 bandwidthburst values.
22056 - If we can't expand our list of entry guards (e.g. because we're
22057 using bridges or we have StrictEntryNodes set), don't mark relays
22058 down when they fail a directory request. Otherwise we're too quick
22059 to mark all our entry points down.
22060 - Authorities no longer send back "400 you're unreachable please fix
22061 it" errors to Tor servers that aren't online all the time. We're
22062 supposed to tolerate these servers now.
22063 - Let directory authorities startup even when they can't generate
22064 a descriptor immediately, e.g. because they don't know their
22066 - Correctly enforce that elements of directory objects do not appear
22067 more often than they are allowed to appear.
22068 - Stop allowing hibernating servers to be "stable" or "fast".
22069 - On Windows, we were preventing other processes from reading
22070 cached-routers while Tor was running. (Reported by janbar)
22071 - Check return values from pthread_mutex functions.
22072 - When opening /dev/null in finish_daemonize(), do not pass the
22073 O_CREAT flag. Fortify was complaining, and correctly so. Fixes
22074 bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
22076 o Controller features:
22077 - The GETCONF command now escapes and quotes configuration values
22078 that don't otherwise fit into the torrc file.
22079 - The SETCONF command now handles quoted values correctly.
22080 - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
22081 ask about source, timestamp of arrival, purpose, etc. We need
22082 something like this to help Vidalia not do GeoIP lookups on bridge
22084 - Allow multiple HashedControlPassword config lines, to support
22085 multiple controller passwords.
22086 - Accept LF instead of CRLF on controller, since some software has a
22087 hard time generating real Internet newlines.
22088 - Add GETINFO values for the server status events
22089 "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
22091 - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
22092 GETINFO for Torstat to use until it can switch to using extrainfos.
22093 - New config option CookieAuthFile to choose a new location for the
22094 cookie authentication file, and config option
22095 CookieAuthFileGroupReadable to make it group-readable.
22096 - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
22097 match requests to applications. Patch from Robert Hogan.
22098 - Add a RESOLVE command to launch hostname lookups. Original patch
22100 - Add GETINFO status/enough-dir-info to let controllers tell whether
22101 Tor has downloaded sufficient directory information. Patch from Tup.
22102 - You can now use the ControlSocket option to tell Tor to listen for
22103 controller connections on Unix domain sockets on systems that
22104 support them. Patch from Peter Palfrader.
22105 - New "GETINFO address-mappings/*" command to get address mappings
22106 with expiry information. "addr-mappings/*" is now deprecated.
22108 - Add a new config option __DisablePredictedCircuits designed for
22109 use by the controller, when we don't want Tor to build any circuits
22111 - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
22112 so we can exit from the middle of the circuit.
22113 - Implement "getinfo status/circuit-established".
22114 - Implement "getinfo status/version/..." so a controller can tell
22115 whether the current version is recommended, and whether any versions
22116 are good, and how many authorities agree. Patch from "shibz".
22117 - Controllers should now specify cache=no or cache=yes when using
22118 the +POSTDESCRIPTOR command.
22119 - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
22120 Robert Hogan. Fixes the first part of bug 681.
22121 - When reporting clock skew, and we know that the clock is _at least
22122 as skewed_ as some value, but we don't know the actual value,
22123 report the value as a "minimum skew."
22125 o Controller bugfixes:
22126 - Generate "STATUS_SERVER" events rather than misspelled
22127 "STATUS_SEVER" events. Caught by mwenge.
22128 - Reject controller commands over 1MB in length, so rogue
22129 processes can't run us out of memory.
22130 - Change the behavior of "getinfo status/good-server-descriptor"
22131 so it doesn't return failure when any authority disappears.
22132 - Send NAMESERVER_STATUS messages for a single failed nameserver
22134 - When the DANGEROUS_VERSION controller status event told us we're
22135 running an obsolete version, it used the string "OLD" to describe
22136 it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
22137 "OBSOLETE" in both cases.
22138 - Respond to INT and TERM SIGNAL commands before we execute the
22139 signal, in case the signal shuts us down. We had a patch in
22140 0.1.2.1-alpha that tried to do this by queueing the response on
22141 the connection's buffer before shutting down, but that really
22142 isn't the same thing at all. Bug located by Matt Edman.
22143 - Provide DNS expiry times in GMT, not in local time. For backward
22144 compatibility, ADDRMAP events only provide GMT expiry in an extended
22145 field. "GETINFO address-mappings" always does the right thing.
22146 - Use CRLF line endings properly in NS events.
22147 - Make 'getinfo fingerprint' return a 551 error if we're not a
22148 server, so we match what the control spec claims we do. Reported
22150 - Fix a typo in an error message when extendcircuit fails that
22151 caused us to not follow the \r\n-based delimiter protocol. Reported
22153 - When tunneling an encrypted directory connection, and its first
22154 circuit fails, do not leave it unattached and ask the controller
22155 to deal. Fixes the second part of bug 681.
22156 - Treat some 403 responses from directory servers as INFO rather than
22157 WARN-severity events.
22159 o Portability / building / compiling:
22160 - When building with --enable-gcc-warnings, check for whether Apple's
22161 warning "-Wshorten-64-to-32" is available.
22162 - Support compilation to target iPhone; patch from cjacker huang.
22163 To build for iPhone, pass the --enable-iphone option to configure.
22164 - Port Tor to build and run correctly on Windows CE systems, using
22165 the wcecompat library. Contributed by Valerio Lupi.
22166 - Detect non-ASCII platforms (if any still exist) and refuse to
22167 build there: some of our code assumes that 'A' is 65 and so on.
22168 - Clear up some MIPSPro compiler warnings.
22169 - Make autoconf search for libevent, openssl, and zlib consistently.
22170 - Update deprecated macros in configure.in.
22171 - When warning about missing headers, tell the user to let us
22172 know if the compile succeeds anyway, so we can downgrade the
22174 - Include the current subversion revision as part of the version
22175 string: either fetch it directly if we're in an SVN checkout, do
22176 some magic to guess it if we're in an SVK checkout, or use
22177 the last-detected version if we're building from a .tar.gz.
22178 Use this version consistently in log messages.
22179 - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
22180 - Read resolv.conf files correctly on platforms where read() returns
22181 partial results on small file reads.
22182 - Build without verbose warnings even on gcc 4.2 and 4.3.
22183 - On Windows, correctly detect errors when listing the contents of
22184 a directory. Fix from lodger.
22185 - Run 'make test' as part of 'make dist', so we stop releasing so
22186 many development snapshots that fail their unit tests.
22187 - Add support to detect Libevent versions in the 1.4.x series
22189 - Add command-line arguments to unit-test executable so that we can
22190 invoke any chosen test from the command line rather than having
22191 to run the whole test suite at once; and so that we can turn on
22192 logging for the unit tests.
22193 - Do not automatically run configure from autogen.sh. This
22194 non-standard behavior tended to annoy people who have built other
22196 - Fix a macro/CPP interaction that was confusing some compilers:
22197 some GCCs don't like #if/#endif pairs inside macro arguments.
22199 - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
22200 Fixes bug 704; fix from Steven Murdoch.
22201 - Correctly detect transparent proxy support on Linux hosts that
22202 require in.h to be included before netfilter_ipv4.h. Patch
22205 o Logging improvements:
22206 - When we haven't had any application requests lately, don't bother
22207 logging that we have expired a bunch of descriptors.
22208 - When attempting to open a logfile fails, tell us why.
22209 - Only log guard node status when guard node status has changed.
22210 - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
22211 make "INFO" 75% less verbose.
22212 - When SafeLogging is disabled, log addresses along with all TLS
22214 - Report TLS "zero return" case as a "clean close" and "IO error"
22215 as a "close". Stop calling closes "unexpected closes": existing
22216 Tors don't use SSL_close(), so having a connection close without
22217 the TLS shutdown handshake is hardly unexpected.
22218 - When we receive a consensus from the future, warn about skew.
22219 - Make "not enough dir info yet" warnings describe *why* Tor feels
22220 it doesn't have enough directory info yet.
22221 - On the USR1 signal, when dmalloc is in use, log the top 10 memory
22222 consumers. (We already do this on HUP.)
22223 - Give more descriptive well-formedness errors for out-of-range
22224 hidden service descriptor/protocol versions.
22225 - Stop recommending that every server operator send mail to tor-ops.
22226 Resolves bug 597. Bugfix on 0.1.2.x.
22227 - Improve skew reporting: try to give the user a better log message
22228 about how skewed they are, and how much this matters.
22229 - New --quiet command-line option to suppress the default console log.
22230 Good in combination with --hash-password.
22231 - Don't complain that "your server has not managed to confirm that its
22232 ports are reachable" if we haven't been able to build any circuits
22234 - Detect the reason for failing to mmap a descriptor file we just
22235 wrote, and give a more useful log message. Fixes bug 533.
22236 - Always prepend "Bug: " to any log message about a bug.
22237 - When dumping memory usage, list bytes used in buffer memory
22239 - When running with dmalloc, dump more stats on hup and on exit.
22240 - Put a platform string (e.g. "Linux i686") in the startup log
22241 message, so when people paste just their logs, we know if it's
22242 OpenBSD or Windows or what.
22243 - When logging memory usage, break down memory used in buffers by
22245 - When we are reporting the DirServer line we just parsed, we were
22246 logging the second stanza of the key fingerprint, not the first.
22247 - Even though Windows is equally happy with / and \ as path separators,
22248 try to use \ consistently on Windows and / consistently on Unix: it
22249 makes the log messages nicer.
22250 - On OSX, stop warning the user that kqueue support in libevent is
22251 "experimental", since it seems to have worked fine for ages.
22253 o Contributed scripts and tools:
22254 - Update linux-tor-prio.sh script to allow QoS based on the uid of
22255 the Tor process. Patch from Marco Bonetti with tweaks from Mike
22257 - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
22258 Unix users an easy way to script their Tor process (e.g. by
22259 adjusting bandwidth based on the time of the day).
22260 - In the exitlist script, only consider the most recently published
22261 server descriptor for each server. Also, when the user requests
22262 a list of servers that _reject_ connections to a given address,
22263 explicitly exclude the IPs that also have servers that accept
22264 connections to that address. Resolves bug 405.
22265 - Include a new contrib/tor-exit-notice.html file that exit relay
22266 operators can put on their website to help reduce abuse queries.
22268 o Newly deprecated features:
22269 - The status/version/num-versioning and status/version/num-concurring
22270 GETINFO controller options are no longer useful in the v3 directory
22271 protocol: treat them as deprecated, and warn when they're used.
22272 - The RedirectExits config option is now deprecated.
22274 o Removed features:
22275 - Drop the old code to choke directory connections when the
22276 corresponding OR connections got full: thanks to the cell queue
22277 feature, OR conns don't get full any more.
22278 - Remove the old "dns worker" server DNS code: it hasn't been default
22279 since 0.1.2.2-alpha, and all the servers are using the new
22281 - Remove the code to generate the oldest (v1) directory format.
22282 - Remove support for the old bw_accounting file: we've been storing
22283 bandwidth accounting information in the state file since
22284 0.1.2.5-alpha. This may result in bandwidth accounting errors
22285 if you try to upgrade from 0.1.1.x or earlier, or if you try to
22286 downgrade to 0.1.1.x or earlier.
22287 - Drop support for OpenSSL version 0.9.6. Just about nobody was using
22288 it, it had no AES, and it hasn't seen any security patches since
22290 - Stop overloading the circuit_t.onionskin field for both "onionskin
22291 from a CREATE cell that we are waiting for a cpuworker to be
22292 assigned" and "onionskin from an EXTEND cell that we are going to
22293 send to an OR as soon as we are connected". Might help with bug 600.
22294 - Remove the tor_strpartition() function: its logic was confused,
22295 and it was only used for one thing that could be implemented far
22297 - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
22298 and TorControl.py, as they use the old v0 controller protocol,
22299 and are obsoleted by TorFlow anyway.
22300 - Drop support for v1 rendezvous descriptors, since we never used
22301 them anyway, and the code has probably rotted by now. Based on
22302 patch from Karsten Loesing.
22303 - Stop allowing address masks that do not correspond to bit prefixes.
22304 We have warned about these for a really long time; now it's time
22305 to reject them. (Patch from croup.)
22306 - Remove an optimization in the AES counter-mode code that assumed
22307 that the counter never exceeded 2^68. When the counter can be set
22308 arbitrarily as an IV (as it is by Karsten's new hidden services
22309 code), this assumption no longer holds.
22310 - Disable the SETROUTERPURPOSE controller command: it is now
22314 Changes in version 0.1.2.19 - 2008-01-17
22315 Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
22316 exit policy a little bit more conservative so it's safer to run an
22317 exit relay on a home system, and fixes a variety of smaller issues.
22320 - Exit policies now reject connections that are addressed to a
22321 relay's public (external) IP address too, unless
22322 ExitPolicyRejectPrivate is turned off. We do this because too
22323 many relays are running nearby to services that trust them based
22324 on network address.
22327 - When the clock jumps forward a lot, do not allow the bandwidth
22328 buckets to become negative. Fixes bug 544.
22329 - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
22330 on every successful resolve. Reported by Mike Perry.
22331 - Purge old entries from the "rephist" database and the hidden
22332 service descriptor database even when DirPort is zero.
22333 - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
22334 requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
22335 crashing or mis-answering these requests.
22336 - When we decide to send a 503 response to a request for servers, do
22337 not then also send the server descriptors: this defeats the whole
22338 purpose. Fixes bug 539.
22341 - Changing the ExitPolicyRejectPrivate setting should cause us to
22342 rebuild our server descriptor.
22343 - Fix handling of hex nicknames when answering controller requests for
22344 networkstatus by name, or when deciding whether to warn about
22345 unknown routers in a config option. (Patch from mwenge.)
22346 - Fix a couple of hard-to-trigger autoconf problems that could result
22347 in really weird results on platforms whose sys/types.h files define
22348 nonstandard integer types.
22349 - Don't try to create the datadir when running --verify-config or
22350 --hash-password. Resolves bug 540.
22351 - If we were having problems getting a particular descriptor from the
22352 directory caches, and then we learned about a new descriptor for
22353 that router, we weren't resetting our failure count. Reported
22355 - Although we fixed bug 539 (where servers would send HTTP status 503
22356 responses _and_ send a body too), there are still servers out there
22357 that haven't upgraded. Therefore, make clients parse such bodies
22358 when they receive them.
22359 - Run correctly on systems where rlim_t is larger than unsigned long.
22360 This includes some 64-bit systems.
22361 - Run correctly on platforms (like some versions of OS X 10.5) where
22362 the real limit for number of open files is OPEN_FILES, not rlim_max
22363 from getrlimit(RLIMIT_NOFILES).
22364 - Avoid a spurious free on base64 failure.
22365 - Avoid segfaults on certain complex invocations of
22366 router_get_by_hexdigest().
22367 - Fix rare bug on REDIRECTSTREAM control command when called with no
22368 port set: it could erroneously report an error when none had
22372 Changes in version 0.1.2.18 - 2007-10-28
22373 Tor 0.1.2.18 fixes many problems including crash bugs, problems with
22374 hidden service introduction that were causing huge delays, and a big
22375 bug that was causing some servers to disappear from the network status
22376 lists for a few hours each day.
22378 o Major bugfixes (crashes):
22379 - If a connection is shut down abruptly because of something that
22380 happened inside connection_flushed_some(), do not call
22381 connection_finished_flushing(). Should fix bug 451:
22382 "connection_stop_writing: Assertion conn->write_event failed"
22383 Bugfix on 0.1.2.7-alpha.
22384 - Fix possible segfaults in functions called from
22385 rend_process_relay_cell().
22387 o Major bugfixes (hidden services):
22388 - Hidden services were choosing introduction points uniquely by
22389 hexdigest, but when constructing the hidden service descriptor
22390 they merely wrote the (potentially ambiguous) nickname.
22391 - Clients now use the v2 intro format for hidden service
22392 connections: they specify their chosen rendezvous point by identity
22393 digest rather than by (potentially ambiguous) nickname. These
22394 changes could speed up hidden service connections dramatically.
22396 o Major bugfixes (other):
22397 - Stop publishing a new server descriptor just because we get a
22398 HUP signal. This led (in a roundabout way) to some servers getting
22399 dropped from the networkstatus lists for a few hours each day.
22400 - When looking for a circuit to cannibalize, consider family as well
22401 as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
22402 circuit cannibalization).
22403 - When a router wasn't listed in a new networkstatus, we were leaving
22404 the flags for that router alone -- meaning it remained Named,
22405 Running, etc -- even though absence from the networkstatus means
22406 that it shouldn't be considered to exist at all anymore. Now we
22407 clear all the flags for routers that fall out of the networkstatus
22408 consensus. Fixes bug 529.
22411 - Don't try to access (or alter) the state file when running
22412 --list-fingerprint or --verify-config or --hash-password. Resolves
22414 - When generating information telling us how to extend to a given
22415 router, do not try to include the nickname if it is
22416 absent. Resolves bug 467.
22417 - Fix a user-triggerable segfault in expand_filename(). (There isn't
22418 a way to trigger this remotely.)
22419 - When sending a status event to the controller telling it that an
22420 OR address is reachable, set the port correctly. (Previously we
22421 were reporting the dir port.)
22422 - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
22423 command. Bugfix on 0.1.2.17.
22424 - When loading bandwidth history, do not believe any information in
22425 the future. Fixes bug 434.
22426 - When loading entry guard information, do not believe any information
22428 - When we have our clock set far in the future and generate an
22429 onion key, then re-set our clock to be correct, we should not stop
22430 the onion key from getting rotated.
22431 - On some platforms, accept() can return a broken address. Detect
22432 this more quietly, and deal accordingly. Fixes bug 483.
22433 - It's not actually an error to find a non-pending entry in the DNS
22434 cache when canceling a pending resolve. Don't log unless stuff
22435 is fishy. Resolves bug 463.
22436 - Don't reset trusted dir server list when we set a configuration
22437 option. Patch from Robert Hogan.
22440 Changes in version 0.1.2.17 - 2007-08-30
22441 Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
22442 X bundles. Vidalia 0.0.14 makes authentication required for the
22443 ControlPort in the default configuration, which addresses important
22444 security risks. Everybody who uses Vidalia (or another controller)
22447 In addition, this Tor update fixes major load balancing problems with
22448 path selection, which should speed things up a lot once many people
22451 o Major bugfixes (security):
22452 - We removed support for the old (v0) control protocol. It has been
22453 deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
22454 become more of a headache than it's worth.
22456 o Major bugfixes (load balancing):
22457 - When choosing nodes for non-guard positions, weight guards
22458 proportionally less, since they already have enough load. Patch
22460 - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
22461 will allow fast Tor servers to get more attention.
22462 - When we're upgrading from an old Tor version, forget our current
22463 guards and pick new ones according to the new weightings. These
22464 three load balancing patches could raise effective network capacity
22465 by a factor of four. Thanks to Mike Perry for measurements.
22467 o Major bugfixes (stream expiration):
22468 - Expire not-yet-successful application streams in all cases if
22469 they've been around longer than SocksTimeout. Right now there are
22470 some cases where the stream will live forever, demanding a new
22471 circuit every 15 seconds. Fixes bug 454; reported by lodger.
22473 o Minor features (controller):
22474 - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
22475 is valid before any authentication has been received. It tells
22476 a controller what kind of authentication is expected, and what
22477 protocol is spoken. Implements proposal 119.
22479 o Minor bugfixes (performance):
22480 - Save on most routerlist_assert_ok() calls in routerlist.c, thus
22481 greatly speeding up loading cached-routers from disk on startup.
22482 - Disable sentinel-based debugging for buffer code: we squashed all
22483 the bugs that this was supposed to detect a long time ago, and now
22484 its only effect is to change our buffer sizes from nice powers of
22485 two (which platform mallocs tend to like) to values slightly over
22486 powers of two (which make some platform mallocs sad).
22488 o Minor bugfixes (misc):
22489 - If exit bandwidth ever exceeds one third of total bandwidth, then
22490 use the correct formula to weight exit nodes when choosing paths.
22491 Based on patch from Mike Perry.
22492 - Choose perfectly fairly among routers when choosing by bandwidth and
22493 weighting by fraction of bandwidth provided by exits. Previously, we
22494 would choose with only approximate fairness, and correct ourselves
22495 if we ran off the end of the list.
22496 - If we require CookieAuthentication but we fail to write the
22497 cookie file, we would warn but not exit, and end up in a state
22498 where no controller could authenticate. Now we exit.
22499 - If we require CookieAuthentication, stop generating a new cookie
22500 every time we change any piece of our config.
22501 - Refuse to start with certain directory authority keys, and
22502 encourage people using them to stop.
22503 - Terminate multi-line control events properly. Original patch
22505 - Fix a minor memory leak when we fail to find enough suitable
22506 servers to choose a circuit.
22507 - Stop leaking part of the descriptor when we run into a particularly
22508 unparseable piece of it.
22511 Changes in version 0.1.2.16 - 2007-08-01
22512 Tor 0.1.2.16 fixes a critical security vulnerability that allows a
22513 remote attacker in certain situations to rewrite the user's torrc
22514 configuration file. This can completely compromise anonymity of users
22515 in most configurations, including those running the Vidalia bundles,
22516 TorK, etc. Or worse.
22518 o Major security fixes:
22519 - Close immediately after missing authentication on control port;
22520 do not allow multiple authentication attempts.
22523 Changes in version 0.1.2.15 - 2007-07-17
22524 Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
22525 problems, fixes compilation on BSD, and fixes a variety of other
22526 bugs. Everybody should upgrade.
22528 o Major bugfixes (compilation):
22529 - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
22531 o Major bugfixes (crashes):
22532 - Try even harder not to dereference the first character after
22533 an mmap(). Reported by lodger.
22534 - Fix a crash bug in directory authorities when we re-number the
22535 routerlist while inserting a new router.
22536 - When the cached-routers file is an even multiple of the page size,
22537 don't run off the end and crash. (Fixes bug 455; based on idea
22539 - Fix eventdns.c behavior on Solaris: It is critical to include
22540 orconfig.h _before_ sys/types.h, so that we can get the expected
22541 definition of _FILE_OFFSET_BITS.
22543 o Major bugfixes (security):
22544 - Fix a possible buffer overrun when using BSD natd support. Bug
22546 - When sending destroy cells from a circuit's origin, don't include
22547 the reason for tearing down the circuit. The spec says we didn't,
22548 and now we actually don't. Reported by lodger.
22549 - Keep streamids from different exits on a circuit separate. This
22550 bug may have allowed other routers on a given circuit to inject
22551 cells into streams. Reported by lodger; fixes bug 446.
22552 - If there's a never-before-connected-to guard node in our list,
22553 never choose any guards past it. This way we don't expand our
22554 guard list unless we need to.
22556 o Minor bugfixes (guard nodes):
22557 - Weight guard selection by bandwidth, so that low-bandwidth nodes
22558 don't get overused as guards.
22560 o Minor bugfixes (directory):
22561 - Correctly count the number of authorities that recommend each
22562 version. Previously, we were under-counting by 1.
22563 - Fix a potential crash bug when we load many server descriptors at
22564 once and some of them make others of them obsolete. Fixes bug 458.
22566 o Minor bugfixes (hidden services):
22567 - Stop tearing down the whole circuit when the user asks for a
22568 connection to a port that the hidden service didn't configure.
22571 o Minor bugfixes (misc):
22572 - On Windows, we were preventing other processes from reading
22573 cached-routers while Tor was running. Reported by janbar.
22574 - Fix a possible (but very unlikely) bug in picking routers by
22575 bandwidth. Add a log message to confirm that it is in fact
22576 unlikely. Patch from lodger.
22577 - Backport a couple of memory leak fixes.
22578 - Backport miscellaneous cosmetic bugfixes.
22581 Changes in version 0.1.2.14 - 2007-05-25
22582 Tor 0.1.2.14 changes the addresses of two directory authorities (this
22583 change especially affects those who serve or use hidden services),
22584 and fixes several other crash- and security-related bugs.
22586 o Directory authority changes:
22587 - Two directory authorities (moria1 and moria2) just moved to new
22588 IP addresses. This change will particularly affect those who serve
22589 or use hidden services.
22591 o Major bugfixes (crashes):
22592 - If a directory server runs out of space in the connection table
22593 as it's processing a begin_dir request, it will free the exit stream
22594 but leave it attached to the circuit, leading to unpredictable
22595 behavior. (Reported by seeess, fixes bug 425.)
22596 - Fix a bug in dirserv_remove_invalid() that would cause authorities
22597 to corrupt memory under some really unlikely scenarios.
22598 - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
22599 - Avoid segfaults when reading from mmaped descriptor file. (Reported
22602 o Major bugfixes (security):
22603 - When choosing an entry guard for a circuit, avoid using guards
22604 that are in the same family as the chosen exit -- not just guards
22605 that are exactly the chosen exit. (Reported by lodger.)
22607 o Major bugfixes (resource management):
22608 - If a directory authority is down, skip it when deciding where to get
22609 networkstatus objects or descriptors. Otherwise we keep asking
22610 every 10 seconds forever. Fixes bug 384.
22611 - Count it as a failure if we fetch a valid network-status but we
22612 don't want to keep it. Otherwise we'll keep fetching it and keep
22613 not wanting to keep it. Fixes part of bug 422.
22614 - If all of our dirservers have given us bad or no networkstatuses
22615 lately, then stop hammering them once per minute even when we
22616 think they're failed. Fixes another part of bug 422.
22619 - Actually set the purpose correctly for descriptors inserted with
22620 purpose=controller.
22621 - When we have k non-v2 authorities in our DirServer config,
22622 we ignored the last k authorities in the list when updating our
22624 - Correctly back-off from requesting router descriptors that we are
22625 having a hard time downloading.
22626 - Read resolv.conf files correctly on platforms where read() returns
22627 partial results on small file reads.
22628 - Don't rebuild the entire router store every time we get 32K of
22629 routers: rebuild it when the journal gets very large, or when
22630 the gaps in the store get very large.
22633 - When routers publish SVN revisions in their router descriptors,
22634 authorities now include those versions correctly in networkstatus
22636 - Warn when using a version of libevent before 1.3b to run a server on
22637 OSX or BSD: these versions interact badly with userspace threads.
22640 Changes in version 0.1.2.13 - 2007-04-24
22641 This release features some major anonymity fixes, such as safer path
22642 selection; better client performance; faster bootstrapping, better
22643 address detection, and better DNS support for servers; write limiting as
22644 well as read limiting to make servers easier to run; and a huge pile of
22645 other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
22647 Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
22648 of the Freenode IRC network, remembering his patience and vision for
22649 free speech on the Internet.
22651 o Major features, client performance:
22652 - Weight directory requests by advertised bandwidth. Now we can
22653 let servers enable write limiting but still allow most clients to
22654 succeed at their directory requests. (We still ignore weights when
22655 choosing a directory authority; I hope this is a feature.)
22656 - Stop overloading exit nodes -- avoid choosing them for entry or
22657 middle hops when the total bandwidth available from non-exit nodes
22658 is much higher than the total bandwidth available from exit nodes.
22659 - Rather than waiting a fixed amount of time between retrying
22660 application connections, we wait only 10 seconds for the first,
22661 10 seconds for the second, and 15 seconds for each retry after
22662 that. Hopefully this will improve the expected user experience.
22663 - Sometimes we didn't bother sending a RELAY_END cell when an attempt
22664 to open a stream fails; now we do in more cases. This should
22665 make clients able to find a good exit faster in some cases, since
22666 unhandleable requests will now get an error rather than timing out.
22668 o Major features, client functionality:
22669 - Implement BEGIN_DIR cells, so we can connect to a directory
22670 server via TLS to do encrypted directory requests rather than
22671 plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
22672 config options if you like. For now, this feature only works if
22673 you already have a descriptor for the destination dirserver.
22674 - Add support for transparent application connections: this basically
22675 bundles the functionality of trans-proxy-tor into the Tor
22676 mainline. Now hosts with compliant pf/netfilter implementations
22677 can redirect TCP connections straight to Tor without diverting
22678 through SOCKS. (Based on patch from tup.)
22679 - Add support for using natd; this allows FreeBSDs earlier than
22680 5.1.2 to have ipfw send connections through Tor without using
22681 SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
22683 o Major features, servers:
22684 - Setting up a dyndns name for your server is now optional: servers
22685 with no hostname or IP address will learn their IP address by
22686 asking the directory authorities. This code only kicks in when you
22687 would normally have exited with a "no address" error. Nothing's
22688 authenticated, so use with care.
22689 - Directory servers now spool server descriptors, v1 directories,
22690 and v2 networkstatus objects to buffers as needed rather than en
22691 masse. They also mmap the cached-routers files. These steps save
22693 - Stop requiring clients to have well-formed certificates, and stop
22694 checking nicknames in certificates. (Clients have certificates so
22695 that they can look like Tor servers, but in the future we might want
22696 to allow them to look like regular TLS clients instead. Nicknames
22697 in certificates serve no purpose other than making our protocol
22698 easier to recognize on the wire.) Implements proposal 106.
22700 o Improvements on DNS support:
22701 - Add "eventdns" asynchronous dns library originally based on code
22702 from Adam Langley. Now we can discard the old rickety dnsworker
22703 concept, and support a wider variety of DNS functions. Allows
22704 multithreaded builds on NetBSD and OpenBSD again.
22705 - Add server-side support for "reverse" DNS lookups (using PTR
22706 records so clients can determine the canonical hostname for a given
22707 IPv4 address). Only supported by servers using eventdns; servers
22708 now announce in their descriptors if they don't support eventdns.
22709 - Workaround for name servers (like Earthlink's) that hijack failing
22710 DNS requests and replace the no-such-server answer with a "helpful"
22711 redirect to an advertising-driven search portal. Also work around
22712 DNS hijackers who "helpfully" decline to hijack known-invalid
22713 RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
22714 lets you turn it off.
22715 - Servers now check for the case when common DNS requests are going to
22716 wildcarded addresses (i.e. all getting the same answer), and change
22717 their exit policy to reject *:* if it's happening.
22718 - When asked to resolve a hostname, don't use non-exit servers unless
22719 requested to do so. This allows servers with broken DNS to be
22720 useful to the network.
22721 - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
22722 useless IPv6 DNS resolves.
22723 - Specify and implement client-side SOCKS5 interface for reverse DNS
22724 lookups (see doc/socks-extensions.txt). Also cache them.
22725 - When we change nameservers or IP addresses, reset and re-launch
22726 our tests for DNS hijacking.
22728 o Improvements on reachability testing:
22729 - Servers send out a burst of long-range padding cells once they've
22730 established that they're reachable. Spread them over 4 circuits,
22731 so hopefully a few will be fast. This exercises bandwidth and
22732 bootstraps them into the directory more quickly.
22733 - When we find our DirPort to be reachable, publish a new descriptor
22734 so we'll tell the world (reported by pnx).
22735 - Directory authorities now only decide that routers are reachable
22736 if their identity keys are as expected.
22737 - Do DirPort reachability tests less often, since a single test
22738 chews through many circuits before giving up.
22739 - Avoid some false positives during reachability testing: don't try
22740 to test via a server that's on the same /24 network as us.
22741 - Start publishing one minute or so after we find our ORPort
22742 to be reachable. This will help reduce the number of descriptors
22743 we have for ourselves floating around, since it's quite likely
22744 other things (e.g. DirPort) will change during that minute too.
22745 - Routers no longer try to rebuild long-term connections to directory
22746 authorities, and directory authorities no longer try to rebuild
22747 long-term connections to all servers. We still don't hang up
22748 connections in these two cases though -- we need to look at it
22749 more carefully to avoid flapping, and we likely need to wait til
22750 0.1.1.x is obsolete.
22752 o Improvements on rate limiting:
22753 - Enable write limiting as well as read limiting. Now we sacrifice
22754 capacity if we're pushing out lots of directory traffic, rather
22755 than overrunning the user's intended bandwidth limits.
22756 - Include TLS overhead when counting bandwidth usage; previously, we
22757 would count only the bytes sent over TLS, but not the bytes used
22759 - Servers decline directory requests much more aggressively when
22760 they're low on bandwidth. Otherwise they end up queueing more and
22761 more directory responses, which can't be good for latency.
22762 - But never refuse directory requests from local addresses.
22763 - Be willing to read or write on local connections (e.g. controller
22764 connections) even when the global rate limiting buckets are empty.
22765 - Flush local controller connection buffers periodically as we're
22766 writing to them, so we avoid queueing 4+ megabytes of data before
22768 - Revise and clean up the torrc.sample that we ship with; add
22769 a section for BandwidthRate and BandwidthBurst.
22771 o Major features, NT services:
22772 - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
22773 command-line flag so that admins can override the default by saying
22774 "tor --service install --user "SomeUser"". This will not affect
22775 existing installed services. Also, warn the user that the service
22776 will look for its configuration file in the service user's
22777 %appdata% directory. (We can't do the "hardwire the user's appdata
22778 directory" trick any more, since we may not have read access to that
22780 - Support running the Tor service with a torrc not in the same
22781 directory as tor.exe and default to using the torrc located in
22782 the %appdata%\Tor\ of the user who installed the service. Patch
22784 - Add an --ignore-missing-torrc command-line option so that we can
22785 get the "use sensible defaults if the configuration file doesn't
22786 exist" behavior even when specifying a torrc location on the
22788 - When stopping an NT service, wait up to 10 sec for it to actually
22789 stop. (Patch from Matt Edman; resolves bug 295.)
22791 o Directory authority improvements:
22792 - Stop letting hibernating or obsolete servers affect uptime and
22794 - Stop listing hibernating servers in the v1 directory.
22795 - Authorities no longer recommend exits as guards if this would shift
22796 too much load to the exit nodes.
22797 - Authorities now specify server versions in networkstatus. This adds
22798 about 2% to the size of compressed networkstatus docs, and allows
22799 clients to tell which servers support BEGIN_DIR and which don't.
22800 The implementation is forward-compatible with a proposed future
22801 protocol version scheme not tied to Tor versions.
22802 - DirServer configuration lines now have an orport= option so
22803 clients can open encrypted tunnels to the authorities without
22804 having downloaded their descriptors yet. Enabled for moria1,
22805 moria2, tor26, and lefkada now in the default configuration.
22806 - Add a BadDirectory flag to network status docs so that authorities
22807 can (eventually) tell clients about caches they believe to be
22808 broken. Not used yet.
22809 - Allow authorities to list nodes as bad exits in their
22810 approved-routers file by fingerprint or by address. If most
22811 authorities set a BadExit flag for a server, clients don't think
22812 of it as a general-purpose exit. Clients only consider authorities
22813 that advertise themselves as listing bad exits.
22814 - Patch from Steve Hildrey: Generate network status correctly on
22815 non-versioning dirservers.
22816 - Have directory authorities allow larger amounts of drift in uptime
22817 without replacing the server descriptor: previously, a server that
22818 restarted every 30 minutes could have 48 "interesting" descriptors
22820 - Reserve the nickname "Unnamed" for routers that can't pick
22821 a hostname: any router can call itself Unnamed; directory
22822 authorities will never allocate Unnamed to any particular router;
22823 clients won't believe that any router is the canonical Unnamed.
22825 o Directory mirrors and clients:
22826 - Discard any v1 directory info that's over 1 month old (for
22827 directories) or over 1 week old (for running-routers lists).
22828 - Clients track responses with status 503 from dirservers. After a
22829 dirserver has given us a 503, we try not to use it until an hour has
22830 gone by, or until we have no dirservers that haven't given us a 503.
22831 - When we get a 503 from a directory, and we're not a server, we no
22832 longer count the failure against the total number of failures
22833 allowed for the object we're trying to download.
22834 - Prepare for servers to publish descriptors less often: never
22835 discard a descriptor simply for being too old until either it is
22836 recommended by no authorities, or until we get a better one for
22837 the same router. Make caches consider retaining old recommended
22838 routers for even longer.
22839 - Directory servers now provide 'Pragma: no-cache' and 'Expires'
22840 headers for content, so that we can work better in the presence of
22841 caching HTTP proxies.
22842 - Stop fetching descriptors if you're not a dir mirror and you
22843 haven't tried to establish any circuits lately. (This currently
22844 causes some dangerous behavior, because when you start up again
22845 you'll use your ancient server descriptors.)
22847 o Major fixes, crashes:
22848 - Stop crashing when the controller asks us to resetconf more than
22849 one config option at once. (Vidalia 0.0.11 does this.)
22850 - Fix a longstanding obscure crash bug that could occur when we run
22851 out of DNS worker processes, if we're not using eventdns. (Resolves
22853 - Fix an assert that could trigger if a controller quickly set then
22854 cleared EntryNodes. (Bug found by Udo van den Heuvel.)
22855 - Avoid crash when telling controller about stream-status and a
22856 stream is detached.
22857 - Avoid sending junk to controllers or segfaulting when a controller
22858 uses EVENT_NEW_DESC with verbose nicknames.
22859 - Stop triggering asserts if the controller tries to extend hidden
22860 service circuits (reported by mwenge).
22861 - If we start a server with ClientOnly 1, then set ClientOnly to 0
22862 and hup, stop triggering an assert based on an empty onion_key.
22863 - Mask out all signals in sub-threads; only the libevent signal
22864 handler should be processing them. This should prevent some crashes
22865 on some machines using pthreads. (Patch from coderman.)
22866 - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
22868 o Major fixes, anonymity/security:
22869 - Automatically avoid picking more than one node from the same
22870 /16 network when constructing a circuit. Add an
22871 "EnforceDistinctSubnets" option to let people disable it if they
22872 want to operate private test networks on a single subnet.
22873 - When generating bandwidth history, round down to the nearest
22874 1k. When storing accounting data, round up to the nearest 1k.
22875 - When we're running as a server, remember when we last rotated onion
22876 keys, so that we will rotate keys once they're a week old even if
22877 we never stay up for a week ourselves.
22878 - If a client asked for a server by name, and there's a named server
22879 in our network-status but we don't have its descriptor yet, we
22880 could return an unnamed server instead.
22881 - Reject (most) attempts to use Tor circuits with length one. (If
22882 many people start using Tor as a one-hop proxy, exit nodes become
22883 a more attractive target for compromise.)
22884 - Just because your DirPort is open doesn't mean people should be
22885 able to remotely teach you about hidden service descriptors. Now
22886 only accept rendezvous posts if you've got HSAuthoritativeDir set.
22887 - Fix a potential race condition in the rpm installer. Found by
22889 - Do not log IPs with TLS failures for incoming TLS
22890 connections. (Fixes bug 382.)
22892 o Major fixes, other:
22893 - If our system clock jumps back in time, don't publish a negative
22894 uptime in the descriptor.
22895 - When we start during an accounting interval before it's time to wake
22896 up, remember to wake up at the correct time. (May fix bug 342.)
22897 - Previously, we would cache up to 16 old networkstatus documents
22898 indefinitely, if they came from nontrusted authorities. Now we
22899 discard them if they are more than 10 days old.
22900 - When we have a state file we cannot parse, tell the user and
22901 move it aside. Now we avoid situations where the user starts
22902 Tor in 1904, Tor writes a state file with that timestamp in it,
22903 the user fixes her clock, and Tor refuses to start.
22904 - Publish a new descriptor after we hup/reload. This is important
22905 if our config has changed such that we'll want to start advertising
22906 our DirPort now, etc.
22907 - If we are using an exit enclave and we can't connect, e.g. because
22908 its webserver is misconfigured to not listen on localhost, then
22909 back off and try connecting from somewhere else before we fail.
22911 o New config options or behaviors:
22912 - When EntryNodes are configured, rebuild the guard list to contain,
22913 in order: the EntryNodes that were guards before; the rest of the
22914 EntryNodes; the nodes that were guards before.
22915 - Do not warn when individual nodes in the configuration's EntryNodes,
22916 ExitNodes, etc are down: warn only when all possible nodes
22917 are down. (Fixes bug 348.)
22918 - Put a lower-bound on MaxAdvertisedBandwidth.
22919 - Start using the state file to store bandwidth accounting data:
22920 the bw_accounting file is now obsolete. We'll keep generating it
22921 for a while for people who are still using 0.1.2.4-alpha.
22922 - Try to batch changes to the state file so that we do as few
22923 disk writes as possible while still storing important things in
22925 - The state file and the bw_accounting file get saved less often when
22926 the AvoidDiskWrites config option is set.
22927 - Make PIDFile work on Windows.
22928 - Add internal descriptions for a bunch of configuration options:
22929 accessible via controller interface and in comments in saved
22931 - Reject *:563 (NNTPS) in the default exit policy. We already reject
22932 NNTP by default, so this seems like a sensible addition.
22933 - Clients now reject hostnames with invalid characters. This should
22934 avoid some inadvertent info leaks. Add an option
22935 AllowNonRFC953Hostnames to disable this behavior, in case somebody
22936 is running a private network with hosts called @, !, and #.
22937 - Check for addresses with invalid characters at the exit as well,
22938 and warn less verbosely when they fail. You can override this by
22939 setting ServerDNSAllowNonRFC953Addresses to 1.
22940 - Remove some options that have been deprecated since at least
22941 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
22942 SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
22943 to set log options. Mark PathlenCoinWeight as obsolete.
22944 - Stop accepting certain malformed ports in configured exit policies.
22945 - When the user uses bad syntax in the Log config line, stop
22946 suggesting other bad syntax as a replacement.
22947 - Add new config option "ResolvConf" to let the server operator
22948 choose an alternate resolve.conf file when using eventdns.
22949 - If one of our entry guards is on the ExcludeNodes list, or the
22950 directory authorities don't think it's a good guard, treat it as
22951 if it were unlisted: stop using it as a guard, and throw it off
22952 the guards list if it stays that way for a long time.
22953 - Allow directory authorities to be marked separately as authorities
22954 for the v1 directory protocol, the v2 directory protocol, and
22955 as hidden service directories, to make it easier to retire old
22956 authorities. V1 authorities should set "HSAuthoritativeDir 1"
22957 to continue being hidden service authorities too.
22958 - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
22959 - Make TrackExitHosts case-insensitive, and fix the behavior of
22960 ".suffix" TrackExitHosts items to avoid matching in the middle of
22962 - New DirPort behavior: if you have your dirport set, you download
22963 descriptors aggressively like a directory mirror, whether or not
22964 your ORPort is set.
22967 - Create a new file ReleaseNotes which was the old ChangeLog. The
22968 new ChangeLog file now includes the notes for all development
22970 - Add a new address-spec.txt document to describe our special-case
22971 addresses: .exit, .onion, and .noconnnect.
22972 - Fork the v1 directory protocol into its own spec document,
22973 and mark dir-spec.txt as the currently correct (v2) spec.
22975 o Packaging, porting, and contrib
22976 - "tor --verify-config" now exits with -1(255) or 0 depending on
22977 whether the config options are bad or good.
22978 - The Debian package now uses --verify-config when (re)starting,
22979 to distinguish configuration errors from other errors.
22980 - Adapt a patch from goodell to let the contrib/exitlist script
22981 take arguments rather than require direct editing.
22982 - Prevent the contrib/exitlist script from printing the same
22983 result more than once.
22984 - Add support to tor-resolve tool for reverse lookups and SOCKS5.
22985 - In the hidden service example in torrc.sample, stop recommending
22986 esoteric and discouraged hidden service options.
22987 - Patch from Michael Mohr to contrib/cross.sh, so it checks more
22988 values before failing, and always enables eventdns.
22989 - Try to detect Windows correctly when cross-compiling.
22990 - Libevent-1.2 exports, but does not define in its headers, strlcpy.
22991 Try to fix this in configure.in by checking for most functions
22992 before we check for libevent.
22993 - Update RPMs to require libevent 1.2.
22994 - Experimentally re-enable kqueue on OSX when using libevent 1.1b
22995 or later. Log when we are doing this, so we can diagnose it when
22996 it fails. (Also, recommend libevent 1.1b for kqueue and
22997 win32 methods; deprecate libevent 1.0b harder; make libevent
22998 recommendation system saner.)
22999 - Build with recent (1.3+) libevents on platforms that do not
23000 define the nonstandard types "u_int8_t" and friends.
23001 - Remove architecture from OS X builds. The official builds are
23002 now universal binaries.
23003 - Run correctly on OS X platforms with case-sensitive filesystems.
23004 - Correctly set maximum connection limit on Cygwin. (This time
23006 - Start compiling on MinGW on Windows (patches from Mike Chiussi
23008 - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
23009 - Finally fix the openssl warnings from newer gccs that believe that
23010 ignoring a return value is okay, but casting a return value and
23011 then ignoring it is a sign of madness.
23012 - On architectures where sizeof(int)>4, still clamp declarable
23013 bandwidth to INT32_MAX.
23015 o Minor features, controller:
23016 - Warn the user when an application uses the obsolete binary v0
23017 control protocol. We're planning to remove support for it during
23018 the next development series, so it's good to give people some
23020 - Add STREAM_BW events to report per-entry-stream bandwidth
23021 use. (Patch from Robert Hogan.)
23022 - Rate-limit SIGNEWNYM signals in response to controllers that
23023 impolitely generate them for every single stream. (Patch from
23024 mwenge; closes bug 394.)
23025 - Add a REMAP status to stream events to note that a stream's
23026 address has changed because of a cached address or a MapAddress
23028 - Make REMAP stream events have a SOURCE (cache or exit), and
23029 make them generated in every case where we get a successful
23030 connected or resolved cell.
23031 - Track reasons for OR connection failure; make these reasons
23032 available via the controller interface. (Patch from Mike Perry.)
23033 - Add a SOCKS_BAD_HOSTNAME client status event so controllers
23034 can learn when clients are sending malformed hostnames to Tor.
23035 - Specify and implement some of the controller status events.
23036 - Have GETINFO dir/status/* work on hosts with DirPort disabled.
23037 - Reimplement GETINFO so that info/names stays in sync with the
23039 - Implement "GETINFO fingerprint".
23040 - Implement "SETEVENTS GUARD" so controllers can get updates on
23041 entry guard status as it changes.
23042 - Make all connections to addresses of the form ".noconnect"
23043 immediately get closed. This lets application/controller combos
23044 successfully test whether they're talking to the same Tor by
23045 watching for STREAM events.
23046 - Add a REASON field to CIRC events; for backward compatibility, this
23047 field is sent only to controllers that have enabled the extended
23048 event format. Also, add additional reason codes to explain why
23049 a given circuit has been destroyed or truncated. (Patches from
23051 - Add a REMOTE_REASON field to extended CIRC events to tell the
23052 controller why a remote OR told us to close a circuit.
23053 - Stream events also now have REASON and REMOTE_REASON fields,
23054 working much like those for circuit events.
23055 - There's now a GETINFO ns/... field so that controllers can ask Tor
23056 about the current status of a router.
23057 - A new event type "NS" to inform a controller when our opinion of
23058 a router's status has changed.
23059 - Add a GETINFO events/names and GETINFO features/names so controllers
23060 can tell which events and features are supported.
23061 - A new CLEARDNSCACHE signal to allow controllers to clear the
23062 client-side DNS cache without expiring circuits.
23063 - Fix CIRC controller events so that controllers can learn the
23064 identity digests of non-Named servers used in circuit paths.
23065 - Let controllers ask for more useful identifiers for servers. Instead
23066 of learning identity digests for un-Named servers and nicknames
23067 for Named servers, the new identifiers include digest, nickname,
23068 and indication of Named status. Off by default; see control-spec.txt
23069 for more information.
23070 - Add a "getinfo address" controller command so it can display Tor's
23071 best guess to the user.
23072 - New controller event to alert the controller when our server
23073 descriptor has changed.
23074 - Give more meaningful errors on controller authentication failure.
23075 - Export the default exit policy via the control port, so controllers
23076 don't need to guess what it is / will be later.
23078 o Minor bugfixes, controller:
23079 - When creating a circuit via the controller, send a 'launched'
23080 event when we're done, so we follow the spec better.
23081 - Correct the control spec to match how the code actually responds
23082 to 'getinfo addr-mappings/*'. Reported by daejees.
23083 - The control spec described a GUARDS event, but the code
23084 implemented a GUARD event. Standardize on GUARD, but let people
23085 ask for GUARDS too. Reported by daejees.
23086 - Give the controller END_STREAM_REASON_DESTROY events _before_ we
23087 clear the corresponding on_circuit variable, and remember later
23088 that we don't need to send a redundant CLOSED event. (Resolves part
23090 - Report events where a resolve succeeded or where we got a socks
23091 protocol error correctly, rather than calling both of them
23093 - Change reported stream target addresses to IP consistently when
23094 we finally get the IP from an exit node.
23095 - Send log messages to the controller even if they happen to be very
23097 - Flush ERR-level controller status events just like we currently
23098 flush ERR-level log events, so that a Tor shutdown doesn't prevent
23099 the controller from learning about current events.
23100 - Report the circuit number correctly in STREAM CLOSED events. Bug
23101 reported by Mike Perry.
23102 - Do not report bizarre values for results of accounting GETINFOs
23103 when the last second's write or read exceeds the allotted bandwidth.
23104 - Report "unrecognized key" rather than an empty string when the
23105 controller tries to fetch a networkstatus that doesn't exist.
23106 - When the controller does a "GETINFO network-status", tell it
23107 about even those routers whose descriptors are very old, and use
23108 long nicknames where appropriate.
23109 - Fix handling of verbose nicknames with ORCONN controller events:
23110 make them show up exactly when requested, rather than exactly when
23112 - Controller signals now work on non-Unix platforms that don't define
23113 SIGUSR1 and SIGUSR2 the way we expect.
23114 - Respond to SIGNAL command before we execute the signal, in case
23115 the signal shuts us down. Suggested by Karsten Loesing.
23116 - Handle reporting OR_CONN_EVENT_NEW events to the controller.
23118 o Minor features, code performance:
23119 - Major performance improvement on inserting descriptors: change
23120 algorithm from O(n^2) to O(n).
23121 - Do not rotate onion key immediately after setting it for the first
23123 - Call router_have_min_dir_info half as often. (This is showing up in
23124 some profiles, but not others.)
23125 - When using GCC, make log_debug never get called at all, and its
23126 arguments never get evaluated, when no debug logs are configured.
23127 (This is showing up in some profiles, but not others.)
23128 - Statistics dumped by -USR2 now include a breakdown of public key
23129 operations, for profiling.
23130 - Make the common memory allocation path faster on machines where
23131 malloc(0) returns a pointer.
23132 - Split circuit_t into origin_circuit_t and or_circuit_t, and
23133 split connection_t into edge, or, dir, control, and base structs.
23134 These will save quite a bit of memory on busy servers, and they'll
23135 also help us track down bugs in the code and bugs in the spec.
23136 - Use OpenSSL's AES implementation on platforms where it's faster.
23137 This could save us as much as 10% CPU usage.
23139 o Minor features, descriptors and descriptor handling:
23140 - Avoid duplicate entries on MyFamily line in server descriptor.
23141 - When Tor receives a router descriptor that it asked for, but
23142 no longer wants (because it has received fresh networkstatuses
23143 in the meantime), do not warn the user. Cache the descriptor if
23144 we're a cache; drop it if we aren't.
23145 - Servers no longer ever list themselves in their "family" line,
23146 even if configured to do so. This makes it easier to configure
23147 family lists conveniently.
23149 o Minor fixes, confusing/misleading log messages:
23150 - Display correct results when reporting which versions are
23151 recommended, and how recommended they are. (Resolves bug 383.)
23152 - Inform the server operator when we decide not to advertise a
23153 DirPort due to AccountingMax enabled or a low BandwidthRate.
23154 - Only include function names in log messages for info/debug messages.
23155 For notice/warn/err, the content of the message should be clear on
23156 its own, and printing the function name only confuses users.
23157 - Remove even more protocol-related warnings from Tor server logs,
23158 such as bad TLS handshakes and malformed begin cells.
23159 - Fix bug 314: Tor clients issued "unsafe socks" warnings even
23160 when the IP address is mapped through MapAddress to a hostname.
23161 - Fix misleading log messages: an entry guard that is "unlisted",
23162 as well as not known to be "down" (because we've never heard
23163 of it), is not therefore "up".
23165 o Minor fixes, old/obsolete behavior:
23166 - Start assuming we can use a create_fast cell if we don't know
23167 what version a router is running.
23168 - We no longer look for identity and onion keys in "identity.key" and
23169 "onion.key" -- these were replaced by secret_id_key and
23170 secret_onion_key in 0.0.8pre1.
23171 - We no longer require unrecognized directory entries to be
23173 - Drop compatibility with obsolete Tors that permit create cells
23174 to have the wrong circ_id_type.
23175 - Remove code to special-case "-cvs" ending, since it has not
23176 actually mattered since 0.0.9.
23177 - Don't re-write the fingerprint file every restart, unless it has
23180 o Minor fixes, misc client-side behavior:
23181 - Always remove expired routers and networkstatus docs before checking
23182 whether we have enough information to build circuits. (Fixes
23184 - When computing clock skew from directory HTTP headers, consider what
23185 time it was when we finished asking for the directory, not what
23187 - Make our socks5 handling more robust to broken socks clients:
23188 throw out everything waiting on the buffer in between socks
23189 handshake phases, since they can't possibly (so the theory
23190 goes) have predicted what we plan to respond to them.
23191 - Expire socks connections if they spend too long waiting for the
23192 handshake to finish. Previously we would let them sit around for
23193 days, if the connecting application didn't close them either.
23194 - And if the socks handshake hasn't started, don't send a
23195 "DNS resolve socks failed" handshake reply; just close it.
23196 - If the user asks to use invalid exit nodes, be willing to use
23198 - Track unreachable entry guards correctly: don't conflate
23199 'unreachable by us right now' with 'listed as down by the directory
23200 authorities'. With the old code, if a guard was unreachable by us
23201 but listed as running, it would clog our guard list forever.
23202 - Behave correctly in case we ever have a network with more than
23203 2GB/s total advertised capacity.
23204 - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
23205 - Fix a memory leak when we ask for "all" networkstatuses and we
23206 get one we don't recognize.
23209 Changes in version 0.1.1.26 - 2006-12-14
23210 o Security bugfixes:
23211 - Stop sending the HttpProxyAuthenticator string to directory
23212 servers when directory connections are tunnelled through Tor.
23213 - Clients no longer store bandwidth history in the state file.
23214 - Do not log introduction points for hidden services if SafeLogging
23218 - Fix an assert failure when a directory authority sets
23219 AuthDirRejectUnlisted and then receives a descriptor from an
23220 unlisted router (reported by seeess).
23223 Changes in version 0.1.1.25 - 2006-11-04
23225 - When a client asks us to resolve (rather than connect to)
23226 an address, and we have a cached answer, give them the cached
23227 answer. Previously, we would give them no answer at all.
23228 - We were building exactly the wrong circuits when we predict
23229 hidden service requirements, meaning Tor would have to build all
23230 its circuits on demand.
23231 - If none of our live entry guards have a high uptime, but we
23232 require a guard with a high uptime, try adding a new guard before
23233 we give up on the requirement. This patch should make long-lived
23234 connections more stable on average.
23235 - When testing reachability of our DirPort, don't launch new
23236 tests when there's already one in progress -- unreachable
23237 servers were stacking up dozens of testing streams.
23239 o Security bugfixes:
23240 - When the user sends a NEWNYM signal, clear the client-side DNS
23241 cache too. Otherwise we continue to act on previous information.
23244 - Avoid a memory corruption bug when creating a hash table for
23246 - Avoid possibility of controller-triggered crash when misusing
23247 certain commands from a v0 controller on platforms that do not
23248 handle printf("%s",NULL) gracefully.
23249 - Avoid infinite loop on unexpected controller input.
23250 - Don't log spurious warnings when we see a circuit close reason we
23251 don't recognize; it's probably just from a newer version of Tor.
23252 - Add Vidalia to the OS X uninstaller script, so when we uninstall
23253 Tor/Privoxy we also uninstall Vidalia.
23256 Changes in version 0.1.1.24 - 2006-09-29
23258 - Allow really slow clients to not hang up five minutes into their
23259 directory downloads (suggested by Adam J. Richter).
23260 - Fix major performance regression from 0.1.0.x: instead of checking
23261 whether we have enough directory information every time we want to
23262 do something, only check when the directory information has changed.
23263 This should improve client CPU usage by 25-50%.
23264 - Don't crash if, after a server has been running for a while,
23265 it can't resolve its hostname.
23266 - When a client asks us to resolve (not connect to) an address,
23267 and we have a cached answer, give them the cached answer.
23268 Previously, we would give them no answer at all.
23271 - Allow Tor to start when RunAsDaemon is set but no logs are set.
23272 - Don't crash when the controller receives a third argument to an
23273 "extendcircuit" request.
23274 - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
23275 response; fix error code when "getinfo dir/status/" fails.
23276 - Fix configure.in to not produce broken configure files with
23277 more recent versions of autoconf. Thanks to Clint for his auto*
23279 - Fix security bug on NetBSD that could allow someone to force
23280 uninitialized RAM to be sent to a server's DNS resolver. This
23281 only affects NetBSD and other platforms that do not bounds-check
23283 - Warn user when using libevent 1.1a or earlier with win32 or kqueue
23284 methods: these are known to be buggy.
23285 - If we're a directory mirror and we ask for "all" network status
23286 documents, we would discard status documents from authorities
23287 we don't recognize.
23290 Changes in version 0.1.1.23 - 2006-07-30
23292 - Fast Tor servers, especially exit nodes, were triggering asserts
23293 due to a bug in handling the list of pending DNS resolves. Some
23294 bugs still remain here; we're hunting them.
23295 - Entry guards could crash clients by sending unexpected input.
23296 - More fixes on reachability testing: if you find yourself reachable,
23297 then don't ever make any client requests (so you stop predicting
23298 circuits), then hup or have your clock jump, then later your IP
23299 changes, you won't think circuits are working, so you won't try to
23300 test reachability, so you won't publish.
23303 - Avoid a crash if the controller does a resetconf firewallports
23304 and then a setconf fascistfirewall=1.
23305 - Avoid an integer underflow when the dir authority decides whether
23306 a router is stable: we might wrongly label it stable, and compute
23307 a slightly wrong median stability, when a descriptor is published
23309 - Fix a place where we might trigger an assert if we can't build our
23310 own server descriptor yet.
23313 Changes in version 0.1.1.22 - 2006-07-05
23315 - Fix a big bug that was causing servers to not find themselves
23316 reachable if they changed IP addresses. Since only 0.1.1.22+
23317 servers can do reachability testing correctly, now we automatically
23318 make sure to test via one of these.
23319 - Fix to allow clients and mirrors to learn directory info from
23320 descriptor downloads that get cut off partway through.
23321 - Directory authorities had a bug in deciding if a newly published
23322 descriptor was novel enough to make everybody want a copy -- a few
23323 servers seem to be publishing new descriptors many times a minute.
23325 - Fix a rare bug that was causing some servers to complain about
23326 "closing wedged cpuworkers" and skip some circuit create requests.
23327 - Make the Exit flag in directory status documents actually work.
23330 Changes in version 0.1.1.21 - 2006-06-10
23331 o Crash and assert fixes from 0.1.1.20:
23332 - Fix a rare crash on Tor servers that have enabled hibernation.
23333 - Fix a seg fault on startup for Tor networks that use only one
23334 directory authority.
23335 - Fix an assert from a race condition that occurs on Tor servers
23336 while exiting, where various threads are trying to log that they're
23337 exiting, and delete the logs, at the same time.
23338 - Make our unit tests pass again on certain obscure platforms.
23341 - Add support for building SUSE RPM packages.
23342 - Speed up initial bootstrapping for clients: if we are making our
23343 first ever connection to any entry guard, then don't mark it down
23345 - When only one Tor server in the network is labelled as a guard,
23346 and we've already picked him, we would cycle endlessly picking him
23347 again, being unhappy about it, etc. Now we specifically exclude
23348 current guards when picking a new guard.
23349 - Servers send create cells more reliably after the TLS connection
23350 is established: we were sometimes forgetting to send half of them
23351 when we had more than one pending.
23352 - If we get a create cell that asks us to extend somewhere, but the
23353 Tor server there doesn't match the expected digest, we now send
23354 a destroy cell back, rather than silently doing nothing.
23355 - Make options->RedirectExit work again.
23356 - Make cookie authentication for the controller work again.
23357 - Stop being picky about unusual characters in the arguments to
23358 mapaddress. It's none of our business.
23359 - Add a new config option "TestVia" that lets you specify preferred
23360 middle hops to use for test circuits. Perhaps this will let me
23361 debug the reachability problems better.
23363 o Log / documentation fixes:
23364 - If we're a server and some peer has a broken TLS certificate, don't
23365 log about it unless ProtocolWarnings is set, i.e., we want to hear
23366 about protocol violations by others.
23367 - Fix spelling of VirtualAddrNetwork in man page.
23368 - Add a better explanation at the top of the autogenerated torrc file
23369 about what happened to our old torrc.
23372 Changes in version 0.1.1.20 - 2006-05-23
23373 o Crash and assert fixes from 0.1.0.17:
23374 - Fix assert bug in close_logs() on exit: when we close and delete
23375 logs, remove them all from the global "logfiles" list.
23376 - Fix an assert error when we're out of space in the connection_list
23377 and we try to post a hidden service descriptor (reported by Peter
23379 - Fix a rare assert error when we've tried all intro points for
23380 a hidden service and we try fetching the service descriptor again:
23381 "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
23382 - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
23383 out and refuse the setconf if it would fail.
23384 - If you specify a relative torrc path and you set RunAsDaemon in
23385 your torrc, then it chdir()'s to the new directory. If you then
23386 HUP, it tries to load the new torrc location, fails, and exits.
23387 The fix: no longer allow a relative path to torrc when using -f.
23388 - Check for integer overflows in more places, when adding elements
23389 to smartlists. This could possibly prevent a buffer overflow
23390 on malicious huge inputs.
23392 o Security fixes, major:
23393 - When we're printing strings from the network, don't try to print
23394 non-printable characters. Now we're safer against shell escape
23395 sequence exploits, and also against attacks to fool users into
23396 misreading their logs.
23397 - Implement entry guards: automatically choose a handful of entry
23398 nodes and stick with them for all circuits. Only pick new guards
23399 when the ones you have are unsuitable, and if the old guards
23400 become suitable again, switch back. This will increase security
23401 dramatically against certain end-point attacks. The EntryNodes
23402 config option now provides some hints about which entry guards you
23403 want to use most; and StrictEntryNodes means to only use those.
23404 Fixes CVE-2006-0414.
23405 - Implement exit enclaves: if we know an IP address for the
23406 destination, and there's a running Tor server at that address
23407 which allows exit to the destination, then extend the circuit to
23408 that exit first. This provides end-to-end encryption and end-to-end
23409 authentication. Also, if the user wants a .exit address or enclave,
23410 use 4 hops rather than 3, and cannibalize a general circ for it
23412 - Obey our firewall options more faithfully:
23413 . If we can't get to a dirserver directly, try going via Tor.
23414 . Don't ever try to connect (as a client) to a place our
23415 firewall options forbid.
23416 . If we specify a proxy and also firewall options, obey the
23417 firewall options even when we're using the proxy: some proxies
23418 can only proxy to certain destinations.
23419 - Make clients regenerate their keys when their IP address changes.
23420 - For the OS X package's modified privoxy config file, comment
23421 out the "logfile" line so we don't log everything passed
23423 - Our TLS handshakes were generating a single public/private
23424 keypair for the TLS context, rather than making a new one for
23425 each new connection. Oops. (But we were still rotating them
23426 periodically, so it's not so bad.)
23427 - When we were cannibalizing a circuit with a particular exit
23428 node in mind, we weren't checking to see if that exit node was
23429 already present earlier in the circuit. Now we are.
23430 - Require server descriptors to list IPv4 addresses -- hostnames
23431 are no longer allowed. This also fixes potential vulnerabilities
23432 to servers providing hostnames as their address and then
23433 preferentially resolving them so they can partition users.
23434 - Our logic to decide if the OR we connected to was the right guy
23435 was brittle and maybe open to a mitm for invalid routers.
23437 o Security fixes, minor:
23438 - Adjust tor-spec.txt to parameterize cell and key lengths. Now
23439 Ian Goldberg can prove things about our handshake protocol more
23441 - Make directory authorities generate a separate "guard" flag to
23442 mean "would make a good entry guard". Clients now honor the
23443 is_guard flag rather than looking at is_fast or is_stable.
23444 - Try to list MyFamily elements by key, not by nickname, and warn
23445 if we've not heard of a server.
23446 - Start using RAND_bytes rather than RAND_pseudo_bytes from
23447 OpenSSL. Also, reseed our entropy every hour, not just at
23448 startup. And add entropy in 512-bit chunks, not 160-bit chunks.
23449 - Refuse server descriptors where the fingerprint line doesn't match
23450 the included identity key. Tor doesn't care, but other apps (and
23451 humans) might actually be trusting the fingerprint line.
23452 - We used to kill the circuit when we receive a relay command we
23453 don't recognize. Now we just drop that cell.
23454 - Fix a bug found by Lasse Overlier: when we were making internal
23455 circuits (intended to be cannibalized later for rendezvous and
23456 introduction circuits), we were picking them so that they had
23457 useful exit nodes. There was no need for this, and it actually
23458 aids some statistical attacks.
23459 - Start treating internal circuits and exit circuits separately.
23460 It's important to keep them separate because internal circuits
23461 have their last hops picked like middle hops, rather than like
23462 exit hops. So exiting on them will break the user's expectations.
23463 - Fix a possible way to DoS dirservers.
23464 - When the client asked for a rendezvous port that the hidden
23465 service didn't want to provide, we were sending an IP address
23466 back along with the end cell. Fortunately, it was zero. But stop
23469 o Packaging improvements:
23470 - Implement --with-libevent-dir option to ./configure. Improve
23471 search techniques to find libevent, and use those for openssl too.
23472 - Fix a couple of bugs in OpenSSL detection. Deal better when
23473 there are multiple SSLs installed with different versions.
23474 - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
23475 - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
23477 - Make unit tests (and other invocations that aren't the real Tor)
23478 run without launching listeners, creating subdirectories, and so on.
23479 - The OS X installer was adding a symlink for tor_resolve but
23480 the binary was called tor-resolve (reported by Thomas Hardly).
23481 - Now we can target arch and OS in rpm builds (contributed by
23482 Phobos). Also make the resulting dist-rpm filename match the
23484 - Apply Matt Ghali's --with-syslog-facility patch to ./configure
23485 if you log to syslog and want something other than LOG_DAEMON.
23486 - Fix the torify (tsocks) config file to not use Tor for localhost
23488 - Start shipping socks-extensions.txt, tor-doc-unix.html,
23489 tor-doc-server.html, and stylesheet.css in the tarball.
23490 - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
23491 They are useless now.
23492 - Add Peter Palfrader's contributed check-tor script. It lets you
23493 easily check whether a given server (referenced by nickname)
23494 is reachable by you.
23495 - Add BSD-style contributed startup script "rc.subr" from Peter
23498 o Directory improvements -- new directory protocol:
23499 - See tor/doc/dir-spec.txt for all the juicy details. Key points:
23500 - Authorities and caches publish individual descriptors (by
23501 digest, by fingerprint, by "all", and by "tell me yours").
23502 - Clients don't download or use the old directory anymore. Now they
23503 download network-statuses from the directory authorities, and
23504 fetch individual server descriptors as needed from mirrors.
23505 - Clients don't download descriptors of non-running servers.
23506 - Download descriptors by digest, not by fingerprint. Caches try to
23507 download all listed digests from authorities; clients try to
23508 download "best" digests from caches. This avoids partitioning
23509 and isolating attacks better.
23510 - Only upload a new server descriptor when options change, 18
23511 hours have passed, uptime is reset, or bandwidth changes a lot.
23512 - Directory authorities silently throw away new descriptors that
23513 haven't changed much if the timestamps are similar. We do this to
23514 tolerate older Tor servers that upload a new descriptor every 15
23515 minutes. (It seemed like a good idea at the time.)
23516 - Clients choose directory servers from the network status lists,
23517 not from their internal list of router descriptors. Now they can
23518 go to caches directly rather than needing to go to authorities
23519 to bootstrap the first set of descriptors.
23520 - When picking a random directory, prefer non-authorities if any
23522 - Add a new flag to network-status indicating whether the server
23523 can answer v2 directory requests too.
23524 - Directory mirrors now cache up to 16 unrecognized network-status
23525 docs, so new directory authorities will be cached too.
23526 - Stop parsing, storing, or using running-routers output (but
23527 mirrors still cache and serve it).
23528 - Clients consider a threshold of "versioning" directory authorities
23529 before deciding whether to warn the user that he's obsolete.
23530 - Authorities publish separate sorted lists of recommended versions
23531 for clients and for servers.
23532 - Change DirServers config line to note which dirs are v1 authorities.
23533 - Put nicknames on the DirServer line, so we can refer to them
23534 without requiring all our users to memorize their IP addresses.
23535 - Remove option when getting directory cache to see whether they
23536 support running-routers; they all do now. Replace it with one
23537 to see whether caches support v2 stuff.
23538 - Stop listing down or invalid nodes in the v1 directory. This
23539 reduces its bulk by about 1/3, and reduces load on mirrors.
23540 - Mirrors no longer cache the v1 directory as often.
23541 - If we as a directory mirror don't know of any v1 directory
23542 authorities, then don't try to cache any v1 directories.
23544 o Other directory improvements:
23545 - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
23546 fifth authoritative directory servers.
23547 - Directory authorities no longer require an open connection from
23548 a server to consider him "reachable". We need this change because
23549 when we add new directory authorities, old servers won't know not
23550 to hang up on them.
23551 - Dir authorities now do their own external reachability testing
23552 of each server, and only list as running the ones they found to
23553 be reachable. We also send back warnings to the server's logs if
23554 it uploads a descriptor that we already believe is unreachable.
23555 - Spread the directory authorities' reachability testing over the
23556 entire testing interval, so we don't try to do 500 TLS's at once
23558 - Make the "stable" router flag in network-status be the median of
23559 the uptimes of running valid servers, and make clients pay
23560 attention to the network-status flags. Thus the cutoff adapts
23561 to the stability of the network as a whole, making IRC, IM, etc
23562 connections more reliable.
23563 - Make the v2 dir's "Fast" flag based on relative capacity, just
23564 like "Stable" is based on median uptime. Name everything in the
23565 top 7/8 Fast, and only the top 1/2 gets to be a Guard.
23566 - Retry directory requests if we fail to get an answer we like
23567 from a given dirserver (we were retrying before, but only if
23568 we fail to connect).
23569 - Return a robots.txt on our dirport to discourage google indexing.
23571 o Controller protocol improvements:
23572 - Revised controller protocol (version 1) that uses ascii rather
23573 than binary: tor/doc/control-spec.txt. Add supporting libraries
23574 in python and java and c# so you can use the controller from your
23575 applications without caring how our protocol works.
23576 - Allow the DEBUG controller event to work again. Mark certain log
23577 entries as "don't tell this to controllers", so we avoid cycles.
23578 - New controller function "getinfo accounting", to ask how
23579 many bytes we've used in this time period.
23580 - Add a "resetconf" command so you can set config options like
23581 AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
23582 a config option in the torrc with no value, then it clears it
23583 entirely (rather than setting it to its default).
23584 - Add a "getinfo config-file" to tell us where torrc is. Also
23585 expose guard nodes, config options/names.
23586 - Add a "quit" command (when when using the controller manually).
23587 - Add a new signal "newnym" to "change pseudonyms" -- that is, to
23588 stop using any currently-dirty circuits for new streams, so we
23589 don't link new actions to old actions. This also occurs on HUP
23590 or "signal reload".
23591 - If we would close a stream early (e.g. it asks for a .exit that
23592 we know would refuse it) but the LeaveStreamsUnattached config
23593 option is set by the controller, then don't close it.
23594 - Add a new controller event type "authdir_newdescs" that allows
23595 controllers to get all server descriptors that were uploaded to
23596 a router in its role as directory authority.
23597 - New controller option "getinfo desc/all-recent" to fetch the
23598 latest server descriptor for every router that Tor knows about.
23599 - Fix the controller's "attachstream 0" command to treat conn like
23600 it just connected, doing address remapping, handling .exit and
23601 .onion idioms, and so on. Now we're more uniform in making sure
23602 that the controller hears about new and closing connections.
23603 - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
23604 the controller. Also, rotate dns and cpu workers if the controller
23605 changes options that will affect them; and initialize the dns
23606 worker cache tree whether or not we start out as a server.
23607 - Add a new circuit purpose 'controller' to let the controller ask
23608 for a circuit that Tor won't try to use. Extend the "extendcircuit"
23609 controller command to let you specify the purpose if you're starting
23610 a new circuit. Add a new "setcircuitpurpose" controller command to
23611 let you change a circuit's purpose after it's been created.
23612 - Let the controller ask for "getinfo dir/server/foo" so it can ask
23613 directly rather than connecting to the dir port. "getinfo
23614 dir/status/foo" also works, but currently only if your DirPort
23616 - Let the controller tell us about certain router descriptors
23617 that it doesn't want Tor to use in circuits. Implement
23618 "setrouterpurpose" and modify "+postdescriptor" to do this.
23619 - If the controller's *setconf commands fail, collect an error
23620 message in a string and hand it back to the controller -- don't
23621 just tell them to go read their logs.
23623 o Scalability, resource management, and performance:
23624 - Fix a major load balance bug: we were round-robin reading in 16 KB
23625 chunks, and servers with bandwidthrate of 20 KB, while downloading
23626 a 600 KB directory, would starve their other connections. Now we
23627 try to be a bit more fair.
23628 - Be more conservative about whether to advertise our DirPort.
23629 The main change is to not advertise if we're running at capacity
23630 and either a) we could hibernate ever or b) our capacity is low
23631 and we're using a default DirPort.
23632 - We weren't cannibalizing circuits correctly for
23633 CIRCUIT_PURPOSE_C_ESTABLISH_REND and
23634 CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
23635 build those from scratch. This should make hidden services faster.
23636 - Predict required circuits better, with an eye toward making hidden
23637 services faster on the service end.
23638 - Compress exit policies even more: look for duplicate lines and
23640 - Generate 18.0.0.0/8 address policy format in descs when we can;
23641 warn when the mask is not reducible to a bit-prefix.
23642 - There used to be two ways to specify your listening ports in a
23643 server descriptor: on the "router" line and with a separate "ports"
23644 line. Remove support for the "ports" line.
23645 - Reduce memory requirements in our structs by changing the order
23646 of fields. Replace balanced trees with hash tables. Inline
23647 bottleneck smartlist functions. Add a "Map from digest to void*"
23648 abstraction so we can do less hex encoding/decoding, and use it
23649 in router_get_by_digest(). Many other CPU and memory improvements.
23650 - Allow tor_gzip_uncompress to extract as much as possible from
23651 truncated compressed data. Try to extract as many
23652 descriptors as possible from truncated http responses (when
23653 purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
23654 - Make circ->onionskin a pointer, not a static array. moria2 was using
23655 125000 circuit_t's after it had been up for a few weeks, which
23656 translates to 20+ megs of wasted space.
23657 - The private half of our EDH handshake keys are now chosen out
23658 of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
23659 - Stop doing the complex voodoo overkill checking for insecure
23660 Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
23661 - Do round-robin writes for TLS of at most 16 kB per write. This
23662 might be more fair on loaded Tor servers.
23663 - Do not use unaligned memory access on alpha, mips, or mipsel.
23664 It *works*, but is very slow, so we treat them as if it doesn't.
23666 o Other bugfixes and improvements:
23667 - Start storing useful information to $DATADIR/state, so we can
23668 remember things across invocations of Tor. Retain unrecognized
23669 lines so we can be forward-compatible, and write a TorVersion line
23670 so we can be backward-compatible.
23671 - If ORPort is set, Address is not explicitly set, and our hostname
23672 resolves to a private IP address, try to use an interface address
23673 if it has a public address. Now Windows machines that think of
23674 themselves as localhost can guess their address.
23675 - Regenerate our local descriptor if it's dirty and we try to use
23676 it locally (e.g. if it changes during reachability detection).
23677 This was causing some Tor servers to keep publishing the same
23678 initial descriptor forever.
23679 - Tor servers with dynamic IP addresses were needing to wait 18
23680 hours before they could start doing reachability testing using
23681 the new IP address and ports. This is because they were using
23682 the internal descriptor to learn what to test, yet they were only
23683 rebuilding the descriptor once they decided they were reachable.
23684 - It turns out we couldn't bootstrap a network since we added
23685 reachability detection in 0.1.0.1-rc. Good thing the Tor network
23686 has never gone down. Add an AssumeReachable config option to let
23687 servers and authorities bootstrap. When we're trying to build a
23688 high-uptime or high-bandwidth circuit but there aren't enough
23689 suitable servers, try being less picky rather than simply failing.
23690 - Newly bootstrapped Tor networks couldn't establish hidden service
23691 circuits until they had nodes with high uptime. Be more tolerant.
23692 - Really busy servers were keeping enough circuits open on stable
23693 connections that they were wrapping around the circuit_id
23694 space. (It's only two bytes.) This exposed a bug where we would
23695 feel free to reuse a circuit_id even if it still exists but has
23696 been marked for close. Try to fix this bug. Some bug remains.
23697 - When we fail to bind or listen on an incoming or outgoing
23698 socket, we now close it before refusing, rather than just
23699 leaking it. (Thanks to Peter Palfrader for finding.)
23700 - Fix a file descriptor leak in start_daemon().
23701 - On Windows, you can't always reopen a port right after you've
23702 closed it. So change retry_listeners() to only close and re-open
23703 ports that have changed.
23704 - Workaround a problem with some http proxies that refuse GET
23705 requests that specify "Content-Length: 0". Reported by Adrian.
23706 - Recover better from TCP connections to Tor servers that are
23707 broken but don't tell you (it happens!); and rotate TLS
23708 connections once a week.
23709 - Fix a scary-looking but apparently harmless bug where circuits
23710 would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
23711 servers, and never switch to state CIRCUIT_STATE_OPEN.
23712 - Check for even more Windows version flags when writing the platform
23713 string in server descriptors, and note any we don't recognize.
23714 - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
23715 get a better idea of why their circuits failed. Not used yet.
23716 - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
23717 We don't use them yet, but maybe one day our DNS resolver will be
23718 able to discover them.
23719 - Let people type "tor --install" as well as "tor -install" when they
23720 want to make it an NT service.
23721 - Looks like we were never delivering deflated (i.e. compressed)
23722 running-routers lists, even when asked. Oops.
23723 - We were leaking some memory every time the client changed IPs.
23724 - Clean up more of the OpenSSL memory when exiting, so we can detect
23725 memory leaks better.
23726 - Never call free() on tor_malloc()d memory. This will help us
23727 use dmalloc to detect memory leaks.
23728 - Some Tor servers process billions of cells per day. These
23729 statistics are now uint64_t's.
23730 - Check [X-]Forwarded-For headers in HTTP requests when generating
23731 log messages. This lets people run dirservers (and caches) behind
23732 Apache but still know which IP addresses are causing warnings.
23733 - Fix minor integer overflow in calculating when we expect to use up
23734 our bandwidth allocation before hibernating.
23735 - Lower the minimum required number of file descriptors to 1000,
23736 so we can have some overhead for Valgrind on Linux, where the
23737 default ulimit -n is 1024.
23738 - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
23739 and its existence is confusing some users.
23741 o Config option fixes:
23742 - Add a new config option ExitPolicyRejectPrivate which defaults
23743 to on. Now all exit policies will begin with rejecting private
23744 addresses, unless the server operator explicitly turns it off.
23745 - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
23746 - Add new ReachableORAddresses and ReachableDirAddresses options
23747 that understand address policies. FascistFirewall is now a synonym
23748 for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
23749 - Start calling it FooListenAddress rather than FooBindAddress,
23750 since few of our users know what it means to bind an address
23752 - If the user gave Tor an odd number of command-line arguments,
23753 we were silently ignoring the last one. Now we complain and fail.
23754 This wins the oldest-bug prize -- this bug has been present since
23755 November 2002, as released in Tor 0.0.0.
23756 - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
23757 torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
23758 it would silently ignore the 6668.
23759 - If we get a linelist or linelist_s config option from the torrc,
23760 e.g. ExitPolicy, and it has no value, warn and skip rather than
23761 silently resetting it to its default.
23762 - Setconf was appending items to linelists, not clearing them.
23763 - Add MyFamily to torrc.sample in the server section, so operators
23764 will be more likely to learn that it exists.
23765 - Make ContactInfo mandatory for authoritative directory servers.
23766 - MaxConn has been obsolete for a while now. Document the ConnLimit
23767 config option, which is a *minimum* number of file descriptors
23768 that must be available else Tor refuses to start.
23769 - Get rid of IgnoreVersion undocumented config option, and make us
23770 only warn, never exit, when we're running an obsolete version.
23771 - Make MonthlyAccountingStart config option truly obsolete now.
23772 - Correct the man page entry on TrackHostExitsExpire.
23773 - Let directory authorities start even if they don't specify an
23774 Address config option.
23775 - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
23776 reflect the updated flags in our v2 dir protocol.
23778 o Config option features:
23779 - Add a new config option FastFirstHopPK (on by default) so clients
23780 do a trivial crypto handshake for their first hop, since TLS has
23781 already taken care of confidentiality and authentication.
23782 - Let the user set ControlListenAddress in the torrc. This can be
23783 dangerous, but there are some cases (like a secured LAN) where it
23785 - New config options to help controllers: FetchServerDescriptors
23786 and FetchHidServDescriptors for whether to fetch server
23787 info and hidserv info or let the controller do it, and
23788 PublishServerDescriptor and PublishHidServDescriptors.
23789 - Also let the controller set the __AllDirActionsPrivate config
23790 option if you want all directory fetches/publishes to happen via
23791 Tor (it assumes your controller bootstraps your circuits).
23792 - Add "HardwareAccel" config option: support for crypto hardware
23793 accelerators via OpenSSL. Off by default, until we find somebody
23794 smart who can test it for us. (It appears to produce seg faults
23795 in at least some cases.)
23796 - New config option "AuthDirRejectUnlisted" for directory authorities
23797 as a panic button: if we get flooded with unusable servers we can
23798 revert to only listing servers in the approved-routers file.
23799 - Directory authorities can now reject/invalidate by key and IP,
23800 with the config options "AuthDirInvalid" and "AuthDirReject", or
23801 by marking a fingerprint as "!reject" or "!invalid" (as its
23802 nickname) in the approved-routers file. This is useful since
23803 currently we automatically list servers as running and usable
23804 even if we know they're jerks.
23805 - Add a new config option TestSocks so people can see whether their
23806 applications are using socks4, socks4a, socks5-with-ip, or
23807 socks5-with-fqdn. This way they don't have to keep mucking
23808 with tcpdump and wondering if something got cached somewhere.
23809 - Add "private:*" as an alias in configuration for policies. Now
23810 you can simplify your exit policy rather than needing to list
23811 every single internal or nonroutable network space.
23812 - Accept "private:*" in routerdesc exit policies; not generated yet
23813 because older Tors do not understand it.
23814 - Add configuration option "V1AuthoritativeDirectory 1" which
23815 moria1, moria2, and tor26 have set.
23816 - Implement an option, VirtualAddrMask, to set which addresses
23817 get handed out in response to mapaddress requests. This works
23818 around a bug in tsocks where 127.0.0.0/8 is never socksified.
23819 - Add a new config option FetchUselessDescriptors, off by default,
23820 for when you plan to run "exitlist" on your client and you want
23821 to know about even the non-running descriptors.
23822 - SocksTimeout: How long do we let a socks connection wait
23823 unattached before we fail it?
23824 - CircuitBuildTimeout: Cull non-open circuits that were born
23825 at least this many seconds ago.
23826 - CircuitIdleTimeout: Cull open clean circuits that were born
23827 at least this many seconds ago.
23828 - New config option SafeSocks to reject all application connections
23829 using unsafe socks protocols. Defaults to off.
23831 o Improved and clearer log messages:
23832 - Reduce clutter in server logs. We're going to try to make
23833 them actually usable now. New config option ProtocolWarnings that
23834 lets you hear about how _other Tors_ are breaking the protocol. Off
23836 - Divide log messages into logging domains. Once we put some sort
23837 of interface on this, it will let people looking at more verbose
23838 log levels specify the topics they want to hear more about.
23839 - Log server fingerprint on startup, so new server operators don't
23840 have to go hunting around their filesystem for it.
23841 - Provide dire warnings to any users who set DirServer manually;
23842 move it out of torrc.sample and into torrc.complete.
23843 - Make the log message less scary when all the dirservers are
23844 temporarily unreachable.
23845 - When tor_socketpair() fails in Windows, give a reasonable
23846 Windows-style errno back.
23847 - Improve tor_gettimeofday() granularity on windows.
23848 - We were printing the number of idle dns workers incorrectly when
23850 - Handle duplicate lines in approved-routers files without warning.
23851 - We were whining about using socks4 or socks5-with-local-lookup
23852 even when it's an IP address in the "virtual" range we designed
23853 exactly for this case.
23854 - Check for named servers when looking them up by nickname;
23855 warn when we're calling a non-named server by its nickname;
23856 don't warn twice about the same name.
23857 - Downgrade the dirserver log messages when whining about
23859 - Correct "your server is reachable" log entries to indicate that
23860 it was self-testing that told us so.
23861 - If we're trying to be a Tor server and running Windows 95/98/ME
23862 as a server, explain that we'll likely crash.
23863 - Provide a more useful warn message when our onion queue gets full:
23864 the CPU is too slow or the exit policy is too liberal.
23865 - Don't warn when we receive a 503 from a dirserver/cache -- this
23866 will pave the way for them being able to refuse if they're busy.
23867 - When we fail to bind a listener, try to provide a more useful
23868 log message: e.g., "Is Tor already running?"
23869 - Only start testing reachability once we've established a
23870 circuit. This will make startup on dir authorities less noisy.
23871 - Don't try to upload hidden service descriptors until we have
23872 established a circuit.
23873 - Tor didn't warn when it failed to open a log file.
23874 - Warn when listening on a public address for socks. We suspect a
23875 lot of people are setting themselves up as open socks proxies,
23876 and they have no idea that jerks on the Internet are using them,
23877 since they simply proxy the traffic into the Tor network.
23878 - Give a useful message when people run Tor as the wrong user,
23879 rather than telling them to start chowning random directories.
23880 - Fix a harmless bug that was causing Tor servers to log
23881 "Got an end because of misc error, but we're not an AP. Closing."
23882 - Fix wrong log message when you add a "HiddenServiceNodes" config
23883 line without any HiddenServiceDir line (reported by Chris Thomas).
23884 - Directory authorities now stop whining so loudly about bad
23885 descriptors that they fetch from other dirservers. So when there's
23886 a log complaint, it's for sure from a freshly uploaded descriptor.
23887 - When logging via syslog, include the pid whenever we provide
23888 a log entry. Suggested by Todd Fries.
23889 - When we're shutting down and we do something like try to post a
23890 server descriptor or rendezvous descriptor, don't complain that
23891 we seem to be unreachable. Of course we are, we're shutting down.
23892 - Change log line for unreachability to explicitly suggest /etc/hosts
23893 as the culprit. Also make it clearer what IP address and ports we're
23894 testing for reachability.
23895 - Put quotes around user-supplied strings when logging so users are
23896 more likely to realize if they add bad characters (like quotes)
23898 - NT service patch from Matt Edman to improve error messages on Win32.
23901 Changes in version 0.1.0.17 - 2006-02-17
23902 o Crash bugfixes on 0.1.0.x:
23903 - When servers with a non-zero DirPort came out of hibernation,
23904 sometimes they would trigger an assert.
23906 o Other important bugfixes:
23907 - On platforms that don't have getrlimit (like Windows), we were
23908 artificially constraining ourselves to a max of 1024
23909 connections. Now just assume that we can handle as many as 15000
23910 connections. Hopefully this won't cause other problems.
23912 o Backported features:
23913 - When we're a server, a client asks for an old-style directory,
23914 and our write bucket is empty, don't give it to him. This way
23915 small servers can continue to serve the directory *sometimes*,
23916 without getting overloaded.
23917 - Whenever you get a 503 in response to a directory fetch, try
23918 once more. This will become important once servers start sending
23919 503's whenever they feel busy.
23920 - Fetch a new directory every 120 minutes, not every 40 minutes.
23921 Now that we have hundreds of thousands of users running the old
23922 directory algorithm, it's starting to hurt a lot.
23923 - Bump up the period for forcing a hidden service descriptor upload
23924 from 20 minutes to 1 hour.
23927 Changes in version 0.1.0.16 - 2006-01-02
23928 o Crash bugfixes on 0.1.0.x:
23929 - On Windows, build with a libevent patch from "I-M Weasel" to avoid
23930 corrupting the heap, losing FDs, or crashing when we need to resize
23931 the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
23932 - It turns out sparc64 platforms crash on unaligned memory access
23933 too -- so detect and avoid this.
23934 - Handle truncated compressed data correctly (by detecting it and
23936 - Fix possible-but-unlikely free(NULL) in control.c.
23937 - When we were closing connections, there was a rare case that
23938 stomped on memory, triggering seg faults and asserts.
23939 - Avoid potential infinite recursion when building a descriptor. (We
23940 don't know that it ever happened, but better to fix it anyway.)
23941 - We were neglecting to unlink marked circuits from soon-to-close OR
23942 connections, which caused some rare scribbling on freed memory.
23943 - Fix a memory stomping race bug when closing the joining point of two
23944 rendezvous circuits.
23945 - Fix an assert in time parsing found by Steven Murdoch.
23947 o Other bugfixes on 0.1.0.x:
23948 - When we're doing reachability testing, provide more useful log
23949 messages so the operator knows what to expect.
23950 - Do not check whether DirPort is reachable when we are suppressing
23951 advertising it because of hibernation.
23952 - When building with -static or on Solaris, we sometimes needed -ldl.
23953 - One of the dirservers (tor26) changed its IP address.
23954 - When we're deciding whether a stream has enough circuits around
23955 that can handle it, count the freshly dirty ones and not the ones
23956 that are so dirty they won't be able to handle it.
23957 - When we're expiring old circuits, we had a logic error that caused
23958 us to close new rendezvous circuits rather than old ones.
23959 - Give a more helpful log message when you try to change ORPort via
23960 the controller: you should upgrade Tor if you want that to work.
23961 - We were failing to parse Tor versions that start with "Tor ".
23962 - Tolerate faulty streams better: when a stream fails for reason
23963 exitpolicy, stop assuming that the router is lying about his exit
23964 policy. When a stream fails for reason misc, allow it to retry just
23965 as if it was resolvefailed. When a stream has failed three times,
23966 reset its failure count so we can try again and get all three tries.
23969 Changes in version 0.1.0.15 - 2005-09-23
23970 o Bugfixes on 0.1.0.x:
23971 - Reject ports 465 and 587 (spam targets) in default exit policy.
23972 - Don't crash when we don't have any spare file descriptors and we
23973 try to spawn a dns or cpu worker.
23974 - Get rid of IgnoreVersion undocumented config option, and make us
23975 only warn, never exit, when we're running an obsolete version.
23976 - Don't try to print a null string when your server finds itself to
23977 be unreachable and the Address config option is empty.
23978 - Make the numbers in read-history and write-history into uint64s,
23979 so they don't overflow and publish negatives in the descriptor.
23980 - Fix a minor memory leak in smartlist_string_remove().
23981 - We were only allowing ourselves to upload a server descriptor at
23982 most every 20 minutes, even if it changed earlier than that.
23983 - Clean up log entries that pointed to old URLs.
23986 Changes in version 0.1.0.14 - 2005-08-08
23987 o Bugfixes on 0.1.0.x:
23988 - Fix the other half of the bug with crypto handshakes
23990 - Fix an assert trigger if you send a 'signal term' via the
23991 controller when it's listening for 'event info' messages.
23994 Changes in version 0.1.0.13 - 2005-08-04
23995 o Bugfixes on 0.1.0.x:
23996 - Fix a critical bug in the security of our crypto handshakes.
23997 - Fix a size_t underflow in smartlist_join_strings2() that made
23998 it do bad things when you hand it an empty smartlist.
23999 - Fix Windows installer to ship Tor license (thanks to Aphex for
24000 pointing out this oversight) and put a link to the doc directory
24002 - Explicitly set no-unaligned-access for sparc: it turns out the
24003 new gcc's let you compile broken code, but that doesn't make it
24007 Changes in version 0.1.0.12 - 2005-07-18
24008 o New directory servers:
24009 - tor26 has changed IP address.
24011 o Bugfixes on 0.1.0.x:
24012 - Fix a possible double-free in tor_gzip_uncompress().
24013 - When --disable-threads is set, do not search for or link against
24014 pthreads libraries.
24015 - Don't trigger an assert if an authoritative directory server
24016 claims its dirport is 0.
24017 - Fix bug with removing Tor as an NT service: some people were
24018 getting "The service did not return an error." Thanks to Matt
24022 Changes in version 0.1.0.11 - 2005-06-30
24023 o Bugfixes on 0.1.0.x:
24024 - Fix major security bug: servers were disregarding their
24025 exit policies if clients behaved unexpectedly.
24026 - Make OS X init script check for missing argument, so we don't
24027 confuse users who invoke it incorrectly.
24028 - Fix a seg fault in "tor --hash-password foo".
24029 - The MAPADDRESS control command was broken.
24032 Changes in version 0.1.0.10 - 2005-06-14
24034 - Make NT services work and start on startup on Win32 (based on
24035 patch by Matt Edman). See the FAQ entry for details.
24036 - Make 'platform' string in descriptor more accurate for Win32
24037 servers, so it's not just "unknown platform".
24038 - REUSEADDR on normal platforms means you can rebind to the port
24039 right after somebody else has let it go. But REUSEADDR on Win32
24040 means you can bind to the port _even when somebody else already
24041 has it bound_! So, don't do that on Win32.
24042 - Clean up the log messages when starting on Win32 with no config
24044 - Allow seeding the RNG on Win32 even when you're not running as
24045 Administrator. If seeding the RNG on Win32 fails, quit.
24047 o Assert / crash bugs:
24048 - Refuse relay cells that claim to have a length larger than the
24049 maximum allowed. This prevents a potential attack that could read
24050 arbitrary memory (e.g. keys) from an exit server's process
24052 - If unofficial Tor clients connect and send weird TLS certs, our
24053 Tor server triggers an assert. Stop asserting, and start handling
24054 TLS errors better in other situations too.
24055 - Fix a race condition that can trigger an assert when we have a
24056 pending create cell and an OR connection attempt fails.
24059 - Use pthreads for worker processes rather than forking. This was
24060 forced because when we forked, we ended up wasting a lot of
24061 duplicate ram over time.
24062 - Also switch to foo_r versions of some library calls to allow
24063 reentry and threadsafeness.
24064 - Implement --disable-threads configure option. Disable threads on
24065 netbsd and openbsd by default, because they have no reentrant
24066 resolver functions (!), and on solaris since it has other
24068 - Fix possible bug on threading platforms (e.g. win32) which was
24069 leaking a file descriptor whenever a cpuworker or dnsworker died.
24070 - Fix a minor memory leak when somebody establishes an introduction
24071 point at your Tor server.
24072 - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
24074 - Add ./configure --with-dmalloc option, to track memory leaks.
24075 - And try to free all memory on closing, so we can detect what
24078 o Protocol correctness:
24079 - When we've connected to an OR and handshaked but didn't like
24080 the result, we were closing the conn without sending destroy
24081 cells back for pending circuits. Now send those destroys.
24082 - Start sending 'truncated' cells back rather than destroy cells
24083 if the circuit closes in front of you. This means we won't have
24084 to abandon partially built circuits.
24085 - Handle changed router status correctly when dirserver reloads
24086 fingerprint file. We used to be dropping all unverified descriptors
24087 right then. The bug was hidden because we would immediately
24088 fetch a directory from another dirserver, which would include the
24089 descriptors we just dropped.
24090 - Revise tor-spec to add more/better stream end reasons.
24091 - Revise all calls to connection_edge_end to avoid sending 'misc',
24092 and to take errno into account where possible.
24093 - Client now retries when streams end early for 'hibernating' or
24094 'resource limit' reasons, rather than failing them.
24095 - Try to be more zealous about calling connection_edge_end when
24096 things go bad with edge conns in connection.c.
24098 o Robustness improvements:
24099 - Better handling for heterogeneous / unreliable nodes:
24100 - Annotate circuits with whether they aim to contain high uptime
24101 nodes and/or high capacity nodes. When building circuits, choose
24103 - This means that every single node in an intro rend circuit,
24104 not just the last one, will have a minimum uptime.
24105 - New config option LongLivedPorts to indicate application streams
24106 that will want high uptime circuits.
24107 - Servers reset uptime when a dir fetch entirely fails. This
24108 hopefully reflects stability of the server's network connectivity.
24109 - If somebody starts his tor server in Jan 2004 and then fixes his
24110 clock, don't make his published uptime be a year.
24111 - Reset published uptime when we wake up from hibernation.
24112 - Introduce a notion of 'internal' circs, which are chosen without
24113 regard to the exit policy of the last hop. Intro and rendezvous
24114 circs must be internal circs, to avoid leaking information. Resolve
24115 and connect streams can use internal circs if they want.
24116 - New circuit pooling algorithm: keep track of what destination ports
24117 we've used recently (start out assuming we'll want to use 80), and
24118 make sure to have enough circs around to satisfy these ports. Also
24119 make sure to have 2 internal circs around if we've required internal
24120 circs lately (and with high uptime if we've seen that lately too).
24121 - Turn addr_policy_compare from a tristate to a quadstate; this should
24122 help address our "Ah, you allow 1.2.3.4:80. You are a good choice
24123 for google.com" problem.
24124 - When a client asks us for a dir mirror and we don't have one,
24125 launch an attempt to get a fresh one.
24126 - First cut at support for "create-fast" cells. Clients can use
24127 these when extending to their first hop, since the TLS already
24128 provides forward secrecy and authentication. Not enabled on
24131 o Reachability testing.
24132 - Your Tor server will automatically try to see if its ORPort and
24133 DirPort are reachable from the outside, and it won't upload its
24134 descriptor until it decides at least ORPort is reachable (when
24135 DirPort is not yet found reachable, publish it as zero).
24136 - When building testing circs for ORPort testing, use only
24137 high-bandwidth nodes, so fewer circuits fail.
24138 - Notice when our IP changes, and reset stats/uptime/reachability.
24139 - Authdirservers don't do ORPort reachability detection, since
24140 they're in clique mode, so it will be rare to find a server not
24141 already connected to them.
24142 - Authdirservers now automatically approve nodes running 0.1.0.2-rc
24146 - Now we allow two unverified servers with the same nickname
24147 but different keys. But if a nickname is verified, only that
24148 nickname+key are allowed.
24149 - If you're an authdirserver connecting to an address:port,
24150 and it's not the OR you were expecting, forget about that
24151 descriptor. If he *was* the one you were expecting, then forget
24152 about all other descriptors for that address:port.
24153 - Allow servers to publish descriptors from 12 hours in the future.
24154 Corollary: only whine about clock skew from the dirserver if
24155 he's a trusted dirserver (since now even verified servers could
24156 have quite wrong clocks).
24157 - Require servers that use the default dirservers to have public IP
24158 addresses. We have too many servers that are configured with private
24159 IPs and their admins never notice the log entries complaining that
24160 their descriptors are being rejected.
24162 o Efficiency improvements:
24163 - Use libevent. Now we can use faster async cores (like epoll, kpoll,
24164 and /dev/poll), and hopefully work better on Windows too.
24165 - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
24166 kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
24167 - Find libevent even if it's hiding in /usr/local/ and your
24168 CFLAGS and LDFLAGS don't tell you to look there.
24169 - Be able to link with libevent as a shared library (the default
24170 after 1.0d), even if it's hiding in /usr/local/lib and even
24171 if you haven't added /usr/local/lib to your /etc/ld.so.conf,
24172 assuming you're running gcc. Otherwise fail and give a useful
24174 - Switch to a new buffer management algorithm, which tries to avoid
24175 reallocing and copying quite as much. In first tests it looks like
24176 it uses *more* memory on average, but less cpu.
24177 - Switch our internal buffers implementation to use a ring buffer,
24178 to hopefully improve performance for fast servers a lot.
24179 - Reenable the part of the code that tries to flush as soon as an
24180 OR outbuf has a full TLS record available. Perhaps this will make
24181 OR outbufs not grow as huge except in rare cases, thus saving lots
24182 of CPU time plus memory.
24183 - Improve performance for dirservers: stop re-parsing the whole
24184 directory every time you regenerate it.
24185 - Keep a big splay tree of (circid,orconn)->circuit mappings to make
24186 it much faster to look up a circuit for each relay cell.
24187 - Remove most calls to assert_all_pending_dns_resolves_ok(),
24188 since they're eating our cpu on exit nodes.
24189 - Stop wasting time doing a case insensitive comparison for every
24190 dns name every time we do any lookup. Canonicalize the names to
24191 lowercase when you first see them.
24194 - Handle unavailable hidden services better. Handle slow or busy
24195 hidden services better.
24196 - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
24197 circ as necessary, if there are any completed ones lying around
24198 when we try to launch one.
24199 - Make hidden services try to establish a rendezvous for 30 seconds
24200 after fetching the descriptor, rather than for n (where n=3)
24201 attempts to build a circuit.
24202 - Adjust maximum skew and age for rendezvous descriptors: let skew
24203 be 48 hours rather than 90 minutes.
24204 - Reject malformed .onion addresses rather then passing them on as
24205 normal web requests.
24208 - More Tor controller support. See
24209 http://tor.eff.org/doc/control-spec.txt for all the new features,
24210 including signals to emulate unix signals from any platform;
24211 redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
24212 closestream; closecircuit; etc.
24213 - Encode hashed controller passwords in hex instead of base64,
24214 to make it easier to write controllers.
24215 - Revise control spec and implementation to allow all log messages to
24216 be sent to controller with their severities intact (suggested by
24217 Matt Edman). Disable debug-level logs while delivering a debug-level
24218 log to the controller, to prevent loop. Update TorControl to handle
24219 new log event types.
24221 o New config options/defaults:
24222 - Begin scrubbing sensitive strings from logs by default. Turn off
24223 the config option SafeLogging if you need to do debugging.
24224 - New exit policy: accept most low-numbered ports, rather than
24225 rejecting most low-numbered ports.
24226 - Put a note in the torrc about abuse potential with the default
24228 - Add support for CONNECTing through https proxies, with "HttpsProxy"
24230 - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
24231 based on patch from Adam Langley (basic auth only).
24232 - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
24233 the fast servers that have been joining lately. (Clients are now
24234 willing to load balance over up to 2 MB of advertised bandwidth
24236 - New config option MaxAdvertisedBandwidth which lets you advertise
24237 a low bandwidthrate (to not attract as many circuits) while still
24238 allowing a higher bandwidthrate in reality.
24239 - Require BandwidthRate to be at least 20kB/s for servers.
24240 - Add a NoPublish config option, so you can be a server (e.g. for
24241 testing running Tor servers in other Tor networks) without
24242 publishing your descriptor to the primary dirservers.
24243 - Add a new AddressMap config directive to rewrite incoming socks
24244 addresses. This lets you, for example, declare an implicit
24245 required exit node for certain sites.
24246 - Add a new TrackHostExits config directive to trigger addressmaps
24247 for certain incoming socks addresses -- for sites that break when
24248 your exit keeps changing (based on patch from Mike Perry).
24249 - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
24250 which describes how often we retry making new circuits if current
24251 ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
24252 how long we're willing to make use of an already-dirty circuit.
24253 - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
24254 a config option "ShutdownWaitLength" (when using kill -INT on
24256 - Fix an edge case in parsing config options: if they say "--"
24257 on the commandline, it's not a config option (thanks weasel).
24258 - New config option DirAllowPrivateAddresses for authdirservers.
24259 Now by default they refuse router descriptors that have non-IP or
24260 private-IP addresses.
24261 - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
24262 smart" default value: low for servers and high for clients.
24263 - Some people were putting "Address " in their torrc, and they had
24264 a buggy resolver that resolved " " to 0.0.0.0. Oops.
24265 - If DataDir is ~/.tor, and that expands to /.tor, then default to
24266 LOCALSTATEDIR/tor instead.
24267 - Implement --verify-config command-line option to check if your torrc
24268 is valid without actually launching Tor.
24270 o Logging improvements:
24271 - When dirservers refuse a server descriptor, we now log its
24272 contactinfo, platform, and the poster's IP address.
24273 - Only warn once per nickname from add_nickname_list_to_smartlist()
24274 per failure, so an entrynode or exitnode choice that's down won't
24276 - When we're connecting to an OR and he's got a different nickname/key
24277 than we were expecting, only complain loudly if we're an OP or a
24278 dirserver. Complaining loudly to the OR admins just confuses them.
24279 - Whine at you if you're a server and you don't set your contactinfo.
24280 - Warn when exit policy implicitly allows local addresses.
24281 - Give a better warning when some other server advertises an
24282 ORPort that is actually an apache running ssl.
24283 - If we get an incredibly skewed timestamp from a dirserver mirror
24284 that isn't a verified OR, don't warn -- it's probably him that's
24286 - When a dirserver causes you to give a warn, mention which dirserver
24288 - Initialize libevent later in the startup process, so the logs are
24289 already established by the time we start logging libevent warns.
24290 - Use correct errno on win32 if libevent fails.
24291 - Check and warn about known-bad/slow libevent versions.
24292 - Stop warning about sigpipes in the logs. We're going to
24293 pretend that getting these occasionally is normal and fine.
24295 o New contrib scripts:
24296 - New experimental script tor/contrib/exitlist: a simple python
24297 script to parse directories and find Tor nodes that exit to listed
24299 - New experimental script tor/contrib/ExerciseServer.py (needs more
24300 work) that uses the controller interface to build circuits and
24301 fetch pages over them. This will help us bootstrap servers that
24302 have lots of capacity but haven't noticed it yet.
24303 - New experimental script tor/contrib/PathDemo.py (needs more work)
24304 that uses the controller interface to let you choose whole paths
24306 "<hostname>.<path,separated by dots>.<length of path>.path"
24307 - New contributed script "privoxy-tor-toggle" to toggle whether
24308 Privoxy uses Tor. Seems to be configured for Debian by default.
24309 - Have torctl.in/tor.sh.in check for location of su binary (needed
24313 - chdir() to your datadirectory at the *end* of the daemonize process,
24314 not the beginning. This was a problem because the first time you
24315 run tor, if your datadir isn't there, and you have runasdaemon set
24316 to 1, it will try to chdir to it before it tries to create it. Oops.
24317 - Fix several double-mark-for-close bugs, e.g. where we were finding
24318 a conn for a cell even if that conn is already marked for close.
24319 - Stop most cases of hanging up on a socks connection without sending
24321 - Fix a bug in the RPM package: set home directory for _tor to
24322 something more reasonable when first installing.
24323 - Stop putting nodename in the Platform string in server descriptors.
24324 It doesn't actually help, and it is confusing/upsetting some people.
24325 - When using preferred entry or exit nodes, ignore whether the
24326 circuit wants uptime or capacity. They asked for the nodes, they
24328 - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
24329 artificially capped at 500kB.
24330 - Cache local dns resolves correctly even when they're .exit
24332 - If we're hibernating and we get a SIGINT, exit immediately.
24333 - tor-resolve requests were ignoring .exit if there was a working circuit
24334 they could use instead.
24335 - Pay more attention to the ClientOnly config option.
24336 - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
24337 installer screens; and don't put stuff into StartupItems unless
24338 the user asks you to.
24341 - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
24342 rather than just rejecting it.
24343 - If our clock jumps forward by 100 seconds or more, assume something
24344 has gone wrong with our network and abandon all not-yet-used circs.
24345 - When an application is using socks5, give him the whole variety of
24346 potential socks5 responses (connect refused, host unreachable, etc),
24347 rather than just "success" or "failure".
24348 - A more sane version numbering system. See
24349 http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
24350 - Change version parsing logic: a version is "obsolete" if it is not
24351 recommended and (1) there is a newer recommended version in the
24352 same series, or (2) there are no recommended versions in the same
24353 series, but there are some recommended versions in a newer series.
24354 A version is "new" if it is newer than any recommended version in
24356 - Report HTTP reasons to client when getting a response from directory
24357 servers -- so you can actually know what went wrong.
24358 - Reject odd-looking addresses at the client (e.g. addresses that
24359 contain a colon), rather than having the server drop them because
24361 - Stop publishing socksport in the directory, since it's not
24362 actually meant to be public. For compatibility, publish a 0 there
24364 - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
24365 cookies to disk and doesn't log each web request to disk. (Thanks
24366 to Brett Carrington for pointing this out.)
24367 - Add OSX uninstall instructions. An actual uninstall script will
24369 - Add "opt hibernating 1" to server descriptor to make it clearer
24370 whether the server is hibernating.
24373 Changes in version 0.0.9.10 - 2005-06-16
24374 o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
24375 - Refuse relay cells that claim to have a length larger than the
24376 maximum allowed. This prevents a potential attack that could read
24377 arbitrary memory (e.g. keys) from an exit server's process
24381 Changes in version 0.0.9.9 - 2005-04-23
24382 o Bugfixes on 0.0.9.x:
24383 - If unofficial Tor clients connect and send weird TLS certs, our
24384 Tor server triggers an assert. This release contains a minimal
24385 backport from the broader fix that we put into 0.1.0.4-rc.
24388 Changes in version 0.0.9.8 - 2005-04-07
24389 o Bugfixes on 0.0.9.x:
24390 - We have a bug that I haven't found yet. Sometimes, very rarely,
24391 cpuworkers get stuck in the 'busy' state, even though the cpuworker
24392 thinks of itself as idle. This meant that no new circuits ever got
24393 established. Here's a workaround to kill any cpuworker that's been
24394 busy for more than 100 seconds.
24397 Changes in version 0.0.9.7 - 2005-04-01
24398 o Bugfixes on 0.0.9.x:
24399 - Fix another race crash bug (thanks to Glenn Fink for reporting).
24400 - Compare identity to identity, not to nickname, when extending to
24401 a router not already in the directory. This was preventing us from
24402 extending to unknown routers. Oops.
24403 - Make sure to create OS X Tor user in <500 range, so we aren't
24404 creating actual system users.
24405 - Note where connection-that-hasn't-sent-end was marked, and fix
24406 a few really loud instances of this harmless bug (it's fixed more
24410 Changes in version 0.0.9.6 - 2005-03-24
24411 o Bugfixes on 0.0.9.x (crashes and asserts):
24412 - Add new end stream reasons to maintenance branch. Fix bug where
24413 reason (8) could trigger an assert. Prevent bug from recurring.
24414 - Apparently win32 stat wants paths to not end with a slash.
24415 - Fix assert triggers in assert_cpath_layer_ok(), where we were
24416 blowing away the circuit that conn->cpath_layer points to, then
24417 checking to see if the circ is well-formed. Backport check to make
24418 sure we dont use the cpath on a closed connection.
24419 - Prevent circuit_resume_edge_reading_helper() from trying to package
24420 inbufs for marked-for-close streams.
24421 - Don't crash on hup if your options->address has become unresolvable.
24422 - Some systems (like OS X) sometimes accept() a connection and tell
24423 you the remote host is 0.0.0.0:0. If this happens, due to some
24424 other mis-features, we get confused; so refuse the conn for now.
24426 o Bugfixes on 0.0.9.x (other):
24427 - Fix harmless but scary "Unrecognized content encoding" warn message.
24428 - Add new stream error reason: TORPROTOCOL reason means "you are not
24429 speaking a version of Tor I understand; say bye-bye to your stream."
24430 - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
24431 into the future, now that we are more tolerant of skew. This
24432 resolves a bug where a Tor server would refuse to cache a directory
24433 because all the directories it gets are too far in the future;
24434 yet the Tor server never logs any complaints about clock skew.
24435 - Mac packaging magic: make man pages useable, and do not overwrite
24436 existing torrc files.
24437 - Make OS X log happily to /var/log/tor/tor.log
24440 Changes in version 0.0.9.5 - 2005-02-22
24441 o Bugfixes on 0.0.9.x:
24442 - Fix an assert race at exit nodes when resolve requests fail.
24443 - Stop picking unverified dir mirrors--it only leads to misery.
24444 - Patch from Matt Edman to make NT services work better. Service
24445 support is still not compiled into the executable by default.
24446 - Patch from Dmitri Bely so the Tor service runs better under
24447 the win32 SYSTEM account.
24448 - Make tor-resolve actually work (?) on Win32.
24449 - Fix a sign bug when getrlimit claims to have 4+ billion
24450 file descriptors available.
24451 - Stop refusing to start when bandwidthburst == bandwidthrate.
24452 - When create cells have been on the onion queue more than five
24453 seconds, just send back a destroy and take them off the list.
24456 Changes in version 0.0.9.4 - 2005-02-03
24457 o Bugfixes on 0.0.9:
24458 - Fix an assert bug that took down most of our servers: when
24459 a server claims to have 1 GB of bandwidthburst, don't
24461 - Don't crash as badly if we have spawned the max allowed number
24462 of dnsworkers, or we're out of file descriptors.
24463 - Block more file-sharing ports in the default exit policy.
24464 - MaxConn is now automatically set to the hard limit of max
24465 file descriptors we're allowed (ulimit -n), minus a few for
24467 - Give a clearer message when servers need to raise their
24468 ulimit -n when they start running out of file descriptors.
24469 - SGI Compatibility patches from Jan Schaumann.
24470 - Tolerate a corrupt cached directory better.
24471 - When a dirserver hasn't approved your server, list which one.
24472 - Go into soft hibernation after 95% of the bandwidth is used,
24473 not 99%. This is especially important for daily hibernators who
24474 have a small accounting max. Hopefully it will result in fewer
24475 cut connections when the hard hibernation starts.
24476 - Load-balance better when using servers that claim more than
24477 800kB/s of capacity.
24478 - Make NT services work (experimental, only used if compiled in).
24481 Changes in version 0.0.9.3 - 2005-01-21
24482 o Bugfixes on 0.0.9:
24483 - Backport the cpu use fixes from main branch, so busy servers won't
24484 need as much processor time.
24485 - Work better when we go offline and then come back, or when we
24486 run Tor at boot before the network is up. We do this by
24487 optimistically trying to fetch a new directory whenever an
24488 application request comes in and we think we're offline -- the
24489 human is hopefully a good measure of when the network is back.
24490 - Backport some minimal hidserv bugfixes: keep rend circuits open as
24491 long as you keep using them; actually publish hidserv descriptors
24492 shortly after they change, rather than waiting 20-40 minutes.
24493 - Enable Mac startup script by default.
24494 - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
24495 - When you update AllowUnverifiedNodes or FirewallPorts via the
24496 controller's setconf feature, we were always appending, never
24498 - When you update HiddenServiceDir via setconf, it was screwing up
24499 the order of reading the lines, making it fail.
24500 - Do not rewrite a cached directory back to the cache; otherwise we
24501 will think it is recent and not fetch a newer one on startup.
24502 - Workaround for webservers that lie about Content-Encoding: Tor
24503 now tries to autodetect compressed directories and compression
24504 itself. This lets us Proxypass dir fetches through apache.
24507 Changes in version 0.0.9.2 - 2005-01-04
24508 o Bugfixes on 0.0.9 (crashes and asserts):
24509 - Fix an assert on startup when the disk is full and you're logging
24511 - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
24512 style address, then we'd crash.
24513 - Fix an assert trigger when the running-routers string we get from
24514 a dirserver is broken.
24515 - Make worker threads start and run on win32. Now win32 servers
24517 - Bandaid (not actually fix, but now it doesn't crash) an assert
24518 where the dns worker dies mysteriously and the main Tor process
24519 doesn't remember anything about the address it was resolving.
24521 o Bugfixes on 0.0.9 (Win32):
24522 - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
24523 name out of the warning/assert messages.
24524 - Fix a superficial "unhandled error on read" bug on win32.
24525 - The win32 installer no longer requires a click-through for our
24526 license, since our Free Software license grants rights but does not
24528 - Win32: When connecting to a dirserver fails, try another one
24529 immediately. (This was already working for non-win32 Tors.)
24530 - Stop trying to parse $HOME on win32 when hunting for default
24532 - Make tor-resolve.c work on win32 by calling network_init().
24534 o Bugfixes on 0.0.9 (other):
24535 - Make 0.0.9.x build on Solaris again.
24536 - Due to a fencepost error, we were blowing away the \n when reporting
24537 confvalue items in the controller. So asking for multiple config
24538 values at once couldn't work.
24539 - When listing circuits that are pending on an opening OR connection,
24540 if we're an OR we were listing circuits that *end* at us as
24541 being pending on every listener, dns/cpu worker, etc. Stop that.
24542 - Dirservers were failing to create 'running-routers' or 'directory'
24543 strings if we had more than some threshold of routers. Fix them so
24544 they can handle any number of routers.
24545 - Fix a superficial "Duplicate mark for close" bug.
24546 - Stop checking for clock skew for OR connections, even for servers.
24547 - Fix a fencepost error that was chopping off the last letter of any
24548 nickname that is the maximum allowed nickname length.
24549 - Update URLs in log messages so they point to the new website.
24550 - Fix a potential problem in mangling server private keys while
24551 writing to disk (not triggered yet, as far as we know).
24552 - Include the licenses for other free software we include in Tor,
24553 now that we're shipping binary distributions more regularly.
24556 Changes in version 0.0.9.1 - 2004-12-15
24557 o Bugfixes on 0.0.9:
24558 - Make hibernation actually work.
24559 - Make HashedControlPassword config option work.
24560 - When we're reporting event circuit status to a controller,
24561 don't use the stream status code.
24564 Changes in version 0.0.9 - 2004-12-12
24565 o Bugfixes on 0.0.8.1 (Crashes and asserts):
24566 - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
24567 write() call will fail and we handle it there.
24568 - When we run out of disk space, or other log writing error, don't
24569 crash. Just stop logging to that log and continue.
24570 - Fix isspace() and friends so they still make Solaris happy
24571 but also so they don't trigger asserts on win32.
24572 - Fix assert failure on malformed socks4a requests.
24573 - Fix an assert bug where a hidden service provider would fail if
24574 the first hop of his rendezvous circuit was down.
24575 - Better handling of size_t vs int, so we're more robust on 64
24578 o Bugfixes on 0.0.8.1 (Win32):
24579 - Make windows sockets actually non-blocking (oops), and handle
24580 win32 socket errors better.
24581 - Fix parse_iso_time on platforms without strptime (eg win32).
24582 - win32: when being multithreaded, leave parent fdarray open.
24583 - Better handling of winsock includes on non-MSV win32 compilers.
24584 - Change our file IO stuff (especially wrt OpenSSL) so win32 is
24586 - Make unit tests work on win32.
24588 o Bugfixes on 0.0.8.1 (Path selection and streams):
24589 - Calculate timeout for waiting for a connected cell from the time
24590 we sent the begin cell, not from the time the stream started. If
24591 it took a long time to establish the circuit, we would time out
24592 right after sending the begin cell.
24593 - Fix router_compare_addr_to_addr_policy: it was not treating a port
24594 of * as always matching, so we were picking reject *:* nodes as
24595 exit nodes too. Oops.
24596 - When read() failed on a stream, we would close it without sending
24597 back an end. So 'connection refused' would simply be ignored and
24598 the user would get no response.
24599 - Stop a sigpipe: when an 'end' cell races with eof from the app,
24600 we shouldn't hold-open-until-flush if the eof arrived first.
24601 - Let resolve conns retry/expire also, rather than sticking around
24603 - Fix more dns related bugs: send back resolve_failed and end cells
24604 more reliably when the resolve fails, rather than closing the
24605 circuit and then trying to send the cell. Also attach dummy resolve
24606 connections to a circuit *before* calling dns_resolve(), to fix
24607 a bug where cached answers would never be sent in RESOLVED cells.
24609 o Bugfixes on 0.0.8.1 (Circuits):
24610 - Finally fix a bug that's been plaguing us for a year:
24611 With high load, circuit package window was reaching 0. Whenever
24612 we got a circuit-level sendme, we were reading a lot on each
24613 socket, but only writing out a bit. So we would eventually reach
24614 eof. This would be noticed and acted on even when there were still
24615 bytes sitting in the inbuf.
24616 - Use identity comparison, not nickname comparison, to choose which
24617 half of circuit-ID-space each side gets to use. This is needed
24618 because sometimes we think of a router as a nickname, and sometimes
24619 as a hex ID, and we can't predict what the other side will do.
24621 o Bugfixes on 0.0.8.1 (Other):
24622 - Fix a whole slew of memory leaks.
24623 - Disallow NDEBUG. We don't ever want anybody to turn off debug.
24624 - If we are using select, make sure we stay within FD_SETSIZE.
24625 - When poll() is interrupted, we shouldn't believe the revents values.
24626 - Add a FAST_SMARTLIST define to optionally inline smartlist_get
24627 and smartlist_len, which are two major profiling offenders.
24628 - If do_hup fails, actually notice.
24629 - Flush the log file descriptor after we print "Tor opening log file",
24630 so we don't see those messages days later.
24631 - Hidden service operators now correctly handle version 1 style
24632 INTRODUCE1 cells (nobody generates them still, so not a critical
24634 - Handle more errnos from accept() without closing the listener.
24635 Some OpenBSD machines were closing their listeners because
24636 they ran out of file descriptors.
24637 - Some people had wrapped their tor client/server in a script
24638 that would restart it whenever it died. This did not play well
24639 with our "shut down if your version is obsolete" code. Now people
24640 don't fetch a new directory if their local cached version is
24642 - Make our autogen.sh work on ksh as well as bash.
24643 - Better torrc example lines for dirbindaddress and orbindaddress.
24644 - Improved bounds checking on parsed ints (e.g. config options and
24645 the ones we find in directories.)
24646 - Stop using separate defaults for no-config-file and
24647 empty-config-file. Now you have to explicitly turn off SocksPort,
24648 if you don't want it open.
24649 - We were starting to daemonize before we opened our logs, so if
24650 there were any problems opening logs, we would complain to stderr,
24651 which wouldn't work, and then mysteriously exit.
24652 - If a verified OR connects to us before he's uploaded his descriptor,
24653 or we verify him and hup but he still has the original TLS
24654 connection, then conn->nickname is still set like he's unverified.
24656 o Code security improvements, inspired by Ilja:
24657 - tor_snprintf wrapper over snprintf with consistent (though not C99)
24659 - Replace sprintf with tor_snprintf. (I think they were all safe, but
24661 - Replace strcpy/strncpy with strlcpy in more places.
24662 - Avoid strcat; use tor_snprintf or strlcat instead.
24664 o Features (circuits and streams):
24665 - New circuit building strategy: keep a list of ports that we've
24666 used in the past 6 hours, and always try to have 2 circuits open
24667 or on the way that will handle each such port. Seed us with port
24668 80 so web users won't complain that Tor is "slow to start up".
24669 - Make kill -USR1 dump more useful stats about circuits.
24670 - When warning about retrying or giving up, print the address, so
24671 the user knows which one it's talking about.
24672 - If you haven't used a clean circuit in an hour, throw it away,
24673 just to be on the safe side. (This means after 6 hours a totally
24674 unused Tor client will have no circuits open.)
24675 - Support "foo.nickname.exit" addresses, to let Alice request the
24676 address "foo" as viewed by exit node "nickname". Based on a patch
24677 from Geoff Goodell.
24678 - If your requested entry or exit node has advertised bandwidth 0,
24680 - Be more greedy about filling up relay cells -- we try reading again
24681 once we've processed the stuff we read, in case enough has arrived
24682 to fill the last cell completely.
24683 - Refuse application socks connections to port 0.
24684 - Use only 0.0.9pre1 and later servers for resolve cells.
24686 o Features (bandwidth):
24687 - Hibernation: New config option "AccountingMax" lets you
24688 set how many bytes per month (in each direction) you want to
24689 allow your server to consume. Rather than spreading those
24690 bytes out evenly over the month, we instead hibernate for some
24691 of the month and pop up at a deterministic time, work until
24692 the bytes are consumed, then hibernate again. Config option
24693 "MonthlyAccountingStart" lets you specify which day of the month
24694 your billing cycle starts on.
24695 - Implement weekly/monthly/daily accounting: now you specify your
24696 hibernation properties by
24697 AccountingMax N bytes|KB|MB|GB|TB
24698 AccountingStart day|week|month [day] HH:MM
24699 Defaults to "month 1 0:00".
24700 - Let bandwidth and interval config options be specified as 5 bytes,
24701 kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
24703 o Features (directories):
24704 - New "router-status" line in directory, to better bind each verified
24705 nickname to its identity key.
24706 - Clients can ask dirservers for /dir.z to get a compressed version
24707 of the directory. Only works for servers running 0.0.9, of course.
24708 - Make clients cache directories and use them to seed their router
24709 lists at startup. This means clients have a datadir again.
24710 - Respond to content-encoding headers by trying to uncompress as
24712 - Clients and servers now fetch running-routers; cache
24713 running-routers; compress running-routers; serve compressed
24715 - Make moria2 advertise a dirport of 80, so people behind firewalls
24716 will be able to get a directory.
24717 - Http proxy support
24718 - Dirservers translate requests for http://%s:%d/x to /x
24719 - You can specify "HttpProxy %s[:%d]" and all dir fetches will
24720 be routed through this host.
24721 - Clients ask for /tor/x rather than /x for new enough dirservers.
24722 This way we can one day coexist peacefully with apache.
24723 - Clients specify a "Host: %s%d" http header, to be compatible
24724 with more proxies, and so running squid on an exit node can work.
24725 - Protect dirservers from overzealous descriptor uploading -- wait
24726 10 seconds after directory gets dirty, before regenerating.
24728 o Features (packages and install):
24729 - Add NSI installer contributed by J Doe.
24730 - Apply NT service patch from Osamu Fujino. Still needs more work.
24731 - Commit VC6 and VC7 workspace/project files.
24732 - Commit a tor.spec for making RPM files, with help from jbash.
24733 - Add contrib/torctl.in contributed by Glenn Fink.
24734 - Make expand_filename handle ~ and ~username.
24735 - Use autoconf to enable largefile support where necessary. Use
24736 ftello where available, since ftell can fail at 2GB.
24737 - Ship src/win32/ in the tarball, so people can use it to build.
24738 - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
24741 o Features (ui controller):
24742 - Control interface: a separate program can now talk to your
24743 client/server over a socket, and get/set config options, receive
24744 notifications of circuits and streams starting/finishing/dying,
24745 bandwidth used, etc. The next step is to get some GUIs working.
24746 Let us know if you want to help out. See doc/control-spec.txt .
24747 - Ship a contrib/tor-control.py as an example script to interact
24748 with the control port.
24749 - "tor --hash-password zzyxz" will output a salted password for
24750 use in authenticating to the control interface.
24751 - Implement the control-spec's SAVECONF command, to write your
24752 configuration to torrc.
24753 - Get cookie authentication for the controller closer to working.
24754 - When set_conf changes our server descriptor, upload a new copy.
24755 But don't upload it too often if there are frequent changes.
24757 o Features (config and command-line):
24758 - Deprecate unofficial config option abbreviations, and abbreviations
24759 not on the command line.
24760 - Configuration infrastructure support for warning on obsolete
24762 - Give a slightly more useful output for "tor -h".
24763 - Break DirFetchPostPeriod into:
24764 - DirFetchPeriod for fetching full directory,
24765 - StatusFetchPeriod for fetching running-routers,
24766 - DirPostPeriod for posting server descriptor,
24767 - RendPostPeriod for posting hidden service descriptors.
24768 - New log format in config:
24769 "Log minsev[-maxsev] stdout|stderr|syslog" or
24770 "Log minsev[-maxsev] file /var/foo"
24771 - DirPolicy config option, to let people reject incoming addresses
24772 from their dirserver.
24773 - "tor --list-fingerprint" will list your identity key fingerprint
24775 - Make tor --version --version dump the cvs Id of every file.
24776 - New 'MyFamily nick1,...' config option for a server to
24777 specify other servers that shouldn't be used in the same circuit
24778 with it. Only believed if nick1 also specifies us.
24779 - New 'NodeFamily nick1,nick2,...' config option for a client to
24780 specify nodes that it doesn't want to use in the same circuit.
24781 - New 'Redirectexit pattern address:port' config option for a
24782 server to redirect exit connections, e.g. to a local squid.
24783 - Add "pass" target for RedirectExit, to make it easier to break
24784 out of a sequence of RedirectExit rules.
24785 - Make the dirservers file obsolete.
24786 - Include a dir-signing-key token in directories to tell the
24787 parsing entity which key is being used to sign.
24788 - Remove the built-in bulky default dirservers string.
24789 - New config option "Dirserver %s:%d [fingerprint]", which can be
24790 repeated as many times as needed. If no dirservers specified,
24791 default to moria1,moria2,tor26.
24792 - Make 'Routerfile' config option obsolete.
24793 - Discourage people from setting their dirfetchpostperiod more often
24794 than once per minute.
24796 o Features (other):
24797 - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
24798 get back to normal.)
24799 - Accept *:706 (silc) in default exit policy.
24800 - Implement new versioning format for post 0.1.
24801 - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
24802 log more informatively.
24803 - Check clock skew for verified servers, but allow unverified
24804 servers and clients to have any clock skew.
24805 - Make sure the hidden service descriptors are at a random offset
24806 from each other, to hinder linkability.
24807 - Clients now generate a TLS cert too, in preparation for having
24808 them act more like real nodes.
24809 - Add a pure-C tor-resolve implementation.
24810 - Use getrlimit and friends to ensure we can reach MaxConn (currently
24811 1024) file descriptors.
24812 - Raise the max dns workers from 50 to 100.
24815 Changes in version 0.0.8.1 - 2004-10-13
24817 - Fix a seg fault that can be triggered remotely for Tor
24818 clients/servers with an open dirport.
24819 - Fix a rare assert trigger, where routerinfos for entries in
24820 our cpath would expire while we're building the path.
24821 - Fix a bug in OutboundBindAddress so it (hopefully) works.
24822 - Fix a rare seg fault for people running hidden services on
24823 intermittent connections.
24824 - Fix a bug in parsing opt keywords with objects.
24825 - Fix a stale pointer assert bug when a stream detaches and
24827 - Fix a string format vulnerability (probably not exploitable)
24828 in reporting stats locally.
24829 - Fix an assert trigger: sometimes launching circuits can fail
24830 immediately, e.g. because too many circuits have failed recently.
24831 - Fix a compile warning on 64 bit platforms.
24834 Changes in version 0.0.8 - 2004-08-25
24836 - Made our unit tests compile again on OpenBSD 3.5, and tor
24837 itself compile again on OpenBSD on a sparc64.
24838 - We were neglecting milliseconds when logging on win32, so
24839 everything appeared to happen at the beginning of each second.
24840 - Check directory signature _before_ you decide whether you're
24841 you're running an obsolete version and should exit.
24842 - Check directory signature _before_ you parse the running-routers
24843 list to decide who's running.
24844 - Check return value of fclose while writing to disk, so we don't
24845 end up with broken files when servers run out of disk space.
24846 - Port it to SunOS 5.9 / Athena
24847 - Fix two bugs in saving onion keys to disk when rotating, so
24848 hopefully we'll get fewer people using old onion keys.
24849 - Remove our mostly unused -- and broken -- hex_encode()
24850 function. Use base16_encode() instead. (Thanks to Timo Lindfors
24851 for pointing out this bug.)
24852 - Only pick and establish intro points after we've gotten a
24854 - Fix assert triggers: if the other side returns an address 0.0.0.0,
24855 don't put it into the client dns cache.
24856 - If a begin failed due to exit policy, but we believe the IP
24857 address should have been allowed, switch that router to exitpolicy
24858 reject *:* until we get our next directory.
24860 o Protocol changes:
24861 - 'Extend' relay cell payloads now include the digest of the
24862 intended next hop's identity key. Now we can verify that we're
24863 extending to the right router, and also extend to routers we
24864 hadn't heard of before.
24867 - Tor nodes can now act as relays (with an advertised ORPort)
24868 without being manually verified by the dirserver operators.
24869 - Uploaded descriptors of unverified routers are now accepted
24870 by the dirservers, and included in the directory.
24871 - Verified routers are listed by nickname in the running-routers
24872 list; unverified routers are listed as "$<fingerprint>".
24873 - We now use hash-of-identity-key in most places rather than
24874 nickname or addr:port, for improved security/flexibility.
24875 - AllowUnverifiedNodes config option to let circuits choose no-name
24876 routers in entry,middle,exit,introduction,rendezvous positions.
24877 Allow middle and rendezvous positions by default.
24878 - When picking unverified routers, skip those with low uptime and/or
24879 low bandwidth, depending on what properties you care about.
24880 - ClientOnly option for nodes that never want to become servers.
24881 - Directory caching.
24882 - "AuthoritativeDir 1" option for the official dirservers.
24883 - Now other nodes (clients and servers) will cache the latest
24884 directory they've pulled down.
24885 - They can enable their DirPort to serve it to others.
24886 - Clients will pull down a directory from any node with an open
24887 DirPort, and check the signature/timestamp correctly.
24888 - Authoritative dirservers now fetch directories from other
24889 authdirservers, to stay better synced.
24890 - Running-routers list tells who's down also, along with noting
24891 if they're verified (listed by nickname) or unverified (listed
24893 - Allow dirservers to serve running-router list separately.
24894 This isn't used yet.
24895 - You can now fetch $DIRURL/running-routers to get just the
24896 running-routers line, not the whole descriptor list. (But
24897 clients don't use this yet.)
24898 - Clients choose nodes proportional to advertised bandwidth.
24899 - Clients avoid using nodes with low uptime as introduction points.
24900 - Handle servers with dynamic IP addresses: don't just replace
24901 options->Address with the resolved one at startup, and
24902 detect our address right before we make a routerinfo each time.
24903 - 'FascistFirewall' option to pick dirservers and ORs on specific
24904 ports; plus 'FirewallPorts' config option to tell FascistFirewall
24905 which ports are open. (Defaults to 80,443)
24906 - Try other dirservers immediately if the one you try is down. This
24907 should tolerate down dirservers better now.
24908 - ORs connect-on-demand to other ORs
24909 - If you get an extend cell to an OR you're not connected to,
24910 connect, handshake, and forward the create cell.
24911 - The authoritative dirservers stay connected to everybody,
24912 and everybody stays connected to 0.0.7 servers, but otherwise
24913 clients/servers expire unused connections after 5 minutes.
24914 - When servers get a sigint, they delay 30 seconds (refusing new
24915 connections) then exit. A second sigint causes immediate exit.
24916 - File and name management:
24917 - Look for .torrc if no CONFDIR "torrc" is found.
24918 - If no datadir is defined, then choose, make, and secure ~/.tor
24920 - If torrc not found, exitpolicy reject *:*.
24921 - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
24922 - If no nickname is defined, derive default from hostname.
24923 - Rename secret key files, e.g. identity.key -> secret_id_key,
24924 to discourage people from mailing their identity key to tor-ops.
24925 - Refuse to build a circuit before the directory has arrived --
24926 it won't work anyway, since you won't know the right onion keys
24928 - Parse tor version numbers so we can do an is-newer-than check
24929 rather than an is-in-the-list check.
24930 - New socks command 'resolve', to let us shim gethostbyname()
24932 - A 'tor_resolve' script to access the socks resolve functionality.
24933 - A new socks-extensions.txt doc file to describe our
24934 interpretation and extensions to the socks protocols.
24935 - Add a ContactInfo option, which gets published in descriptor.
24936 - Write tor version at the top of each log file
24937 - New docs in the tarball:
24939 - Document that you should proxy your SSL traffic too.
24940 - Log a warning if the user uses an unsafe socks variant, so people
24941 are more likely to learn about privoxy or socat.
24942 - Log a warning if you're running an unverified server, to let you
24943 know you might want to get it verified.
24944 - Change the default exit policy to reject the default edonkey,
24945 kazaa, gnutella ports.
24946 - Add replace_file() to util.[ch] to handle win32's rename().
24947 - Publish OR uptime in descriptor (and thus in directory) too.
24948 - Remember used bandwidth (both in and out), and publish 15-minute
24949 snapshots for the past day into our descriptor.
24950 - Be more aggressive about trying to make circuits when the network
24951 has changed (e.g. when you unsuspend your laptop).
24952 - Check for time skew on http headers; report date in response to
24954 - If the entrynode config line has only one node, don't pick it as
24956 - Add strict{entry|exit}nodes config options. If set to 1, then
24957 we refuse to build circuits that don't include the specified entry
24959 - OutboundBindAddress config option, to bind to a specific
24960 IP address for outgoing connect()s.
24961 - End truncated log entries (e.g. directories) with "[truncated]".
24964 Changes in version 0.0.7.3 - 2004-08-12
24965 o Stop dnsworkers from triggering an assert failure when you
24966 ask them to resolve the host "".
24969 Changes in version 0.0.7.2 - 2004-07-07
24970 o A better fix for the 0.0.0.0 problem, that will hopefully
24971 eliminate the remaining related assertion failures.
24974 Changes in version 0.0.7.1 - 2004-07-04
24975 o When an address resolves to 0.0.0.0, treat it as a failed resolve,
24976 since internally we use 0.0.0.0 to signify "not yet resolved".
24979 Changes in version 0.0.7 - 2004-06-07
24980 o Fixes for crashes and other obnoxious bugs:
24981 - Fix an epipe bug: sometimes when directory connections failed
24982 to connect, we would give them a chance to flush before closing
24984 - When we detached from a circuit because of resolvefailed, we
24985 would immediately try the same circuit twice more, and then
24986 give up on the resolve thinking we'd tried three different
24988 - Limit the number of intro circuits we'll attempt to build for a
24989 hidden service per 15-minute period.
24990 - Check recommended-software string *early*, before actually parsing
24991 the directory. Thus we can detect an obsolete version and exit,
24992 even if the new directory format doesn't parse.
24993 o Fixes for security bugs:
24994 - Remember which nodes are dirservers when you startup, and if a
24995 random OR enables his dirport, don't automatically assume he's
24996 a trusted dirserver.
24998 - Directory connections were asking the wrong poll socket to
24999 start writing, and not asking themselves to start writing.
25000 - When we detached from a circuit because we sent a begin but
25001 didn't get a connected, we would use it again the first time;
25002 but after that we would correctly switch to a different one.
25003 - Stop warning when the first onion decrypt attempt fails; they
25004 will sometimes legitimately fail now that we rotate keys.
25005 - Override unaligned-access-ok check when $host_cpu is ia64 or
25006 arm. Apparently they allow it but the kernel whines.
25007 - Dirservers try to reconnect periodically too, in case connections
25009 - Fix some memory leaks in directory servers.
25010 - Allow backslash in Win32 filenames.
25011 - Made Tor build complain-free on FreeBSD, hopefully without
25012 breaking other BSD builds. We'll see.
25013 - Check directory signatures based on name of signer, not on whom
25014 we got the directory from. This will let us cache directories more
25016 - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
25019 - Doxygen markup on all functions and global variables.
25020 - Make directory functions update routerlist, not replace it. So
25021 now directory disagreements are not so critical a problem.
25022 - Remove the upper limit on number of descriptors in a dirserver's
25023 directory (not that we were anywhere close).
25024 - Allow multiple logfiles at different severity ranges.
25025 - Allow *BindAddress to specify ":port" rather than setting *Port
25026 separately. Allow multiple instances of each BindAddress config
25027 option, so you can bind to multiple interfaces if you want.
25028 - Allow multiple exit policy lines, which are processed in order.
25029 Now we don't need that huge line with all the commas in it.
25030 - Enable accept/reject policies on SOCKS connections, so you can bind
25031 to 0.0.0.0 but still control who can use your OP.
25032 - Updated the man page to reflect these features.
25035 Changes in version 0.0.6.2 - 2004-05-16
25036 o Our integrity-checking digest was checking only the most recent cell,
25037 not the previous cells like we'd thought.
25038 Thanks to Stefan Mark for finding the flaw!
25041 Changes in version 0.0.6.1 - 2004-05-06
25042 o Fix two bugs in our AES counter-mode implementation (this affected
25043 onion-level stream encryption, but not TLS-level). It turns
25044 out we were doing something much more akin to a 16-character
25045 polyalphabetic cipher. Oops.
25046 Thanks to Stefan Mark for finding the flaw!
25047 o Retire moria3 as a directory server, and add tor26 as a directory
25051 Changes in version 0.0.6 - 2004-05-02
25053 - Hidden services and rendezvous points are implemented. Go to
25054 http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
25055 hidden services. (This only works via a socks4a proxy such as
25056 Privoxy, and currently it's quite slow.)
25057 - We now rotate link (tls context) keys and onion keys.
25058 - CREATE cells now include oaep padding, so you can tell
25059 if you decrypted them correctly.
25060 - Retry stream correctly when we fail to connect because of
25061 exit-policy-reject (should try another) or can't-resolve-address.
25062 - When we hup a dirserver and we've *removed* a server from the
25063 approved-routers list, now we remove that server from the
25064 in-memory directories too.
25065 - Add bandwidthburst to server descriptor.
25066 - Directories now say which dirserver signed them.
25067 - Use a tor_assert macro that logs failed assertions too.
25068 - Since we don't support truncateds much, don't bother sending them;
25069 just close the circ.
25070 - Fetch randomness from /dev/urandom better (not via fopen/fread)
25071 - Better debugging for tls errors
25072 - Set Content-Type on the directory and hidserv descriptor.
25073 - Remove IVs from cipher code, since AES-ctr has none.
25075 - Fix an assert trigger for exit nodes that's been plaguing us since
25076 the days of 0.0.2prexx (thanks weasel!)
25077 - Fix a bug where we were closing tls connections intermittently.
25078 It turns out openssl keeps its errors around -- so if an error
25079 happens, and you don't ask about it, and then another openssl
25080 operation happens and succeeds, and you ask if there was an error,
25081 it tells you about the first error.
25082 - Fix a bug that's been lurking since 27 may 03 (!)
25083 When passing back a destroy cell, we would use the wrong circ id.
25084 - Don't crash if a conn that sent a begin has suddenly lost its circuit.
25085 - Some versions of openssl have an SSL_pending function that erroneously
25086 returns bytes when there is a non-application record pending.
25087 - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
25088 o We were using an array of length zero in a few places.
25089 o Win32's gethostbyname can't resolve an IP to an IP.
25090 o Win32's close can't close a socket.
25091 o Handle windows socket errors correctly.
25093 - check for <sys/limits.h> so we build on FreeBSD again, and
25094 <machine/limits.h> for NetBSD.
25097 Changes in version 0.0.5 - 2004-03-30
25098 o Install torrc as torrc.sample -- we no longer clobber your
25100 o Fix mangled-state bug in directory fetching (was causing sigpipes).
25101 o Only build circuits after we've fetched the directory: clients were
25102 using only the directory servers before they'd fetched a directory.
25103 This also means longer startup time; so it goes.
25104 o Fix an assert trigger where an OP would fail to handshake, and we'd
25105 expect it to have a nickname.
25106 o Work around a tsocks bug: do a socks reject when AP connection dies
25107 early, else tsocks goes into an infinite loop.
25108 o Hold socks connection open until reply is flushed (if possible)
25109 o Make exit nodes resolve IPs to IPs immediately, rather than asking
25110 the dns farm to do it.
25111 o Fix c99 aliasing warnings in rephist.c
25112 o Don't include server descriptors that are older than 24 hours in the
25114 o Give socks 'reject' replies their whole 15s to attempt to flush,
25115 rather than seeing the 60s timeout and assuming the flush had failed.
25116 o Clean automake droppings from the cvs repository
25117 o Add in a 'notice' log level for things the operator should hear
25118 but that aren't warnings
25121 Changes in version 0.0.4 - 2004-03-26
25122 o When connecting to a dirserver or OR and the network is down,
25126 Changes in version 0.0.3 - 2004-03-26
25127 o Warn and fail if server chose a nickname with illegal characters
25128 o Port to Solaris and Sparc:
25129 - include missing header fcntl.h
25130 - have autoconf find -lsocket -lnsl automatically
25131 - deal with hardware word alignment
25132 - make uname() work (solaris has a different return convention)
25133 - switch from using signal() to sigaction()
25134 o Preliminary work on reputation system:
25135 - Keep statistics on success/fail of connect attempts; they're published
25136 by kill -USR1 currently.
25137 - Add a RunTesting option to try to learn link state by creating test
25138 circuits, even when SocksPort is off.
25139 - Remove unused open circuits when there are too many.
25142 Changes in version 0.0.2 - 2004-03-19
25143 - Include strlcpy and strlcat for safer string ops
25144 - define INADDR_NONE so we compile (but still not run) on solaris
25147 Changes in version 0.0.2pre27 - 2004-03-14
25149 - Allow internal tor networks (we were rejecting internal IPs,
25150 now we allow them if they're set explicitly).
25151 - And fix a few endian issues.
25154 Changes in version 0.0.2pre26 - 2004-03-14
25156 - If a stream times out after 15s without a connected cell, don't
25157 try that circuit again: try a new one.
25158 - Retry streams at most 4 times. Then give up.
25159 - When a dirserver gets a descriptor from an unknown router, it
25160 logs its fingerprint (so the dirserver operator can choose to
25161 accept it even without mail from the server operator).
25162 - Inform unapproved servers when we reject their descriptors.
25163 - Make tor build on Windows again. It works as a client, who knows
25165 - Clearer instructions in the torrc for how to set up a server.
25166 - Be more efficient about reading fd's when our global token bucket
25167 (used for rate limiting) becomes empty.
25169 - Stop asserting that computers always go forward in time. It's
25171 - When we sent a cell (e.g. destroy) and then marked an OR connection
25172 expired, we might close it before finishing a flush if the other
25173 side isn't reading right then.
25174 - Don't allow dirservers to start if they haven't defined
25175 RecommendedVersions
25176 - We were caching transient dns failures. Oops.
25177 - Prevent servers from publishing an internal IP as their address.
25178 - Address a strcat vulnerability in circuit.c
25181 Changes in version 0.0.2pre25 - 2004-03-04
25183 - Put the OR's IP in its router descriptor, not its fqdn. That way
25184 we'll stop being stalled by gethostbyname for nodes with flaky dns,
25187 - If the user typed in an address that didn't resolve, the server
25191 Changes in version 0.0.2pre24 - 2004-03-03
25193 - Fix an assertion failure in dns.c, where we were trying to dequeue
25194 a pending dns resolve even if it wasn't pending
25195 - Fix a spurious socks5 warning about still trying to write after the
25196 connection is finished.
25197 - Hold certain marked_for_close connections open until they're finished
25198 flushing, rather than losing bytes by closing them too early.
25199 - Correctly report the reason for ending a stream
25200 - Remove some duplicate calls to connection_mark_for_close
25201 - Put switch_id and start_daemon earlier in the boot sequence, so it
25202 will actually try to chdir() to options.DataDirectory
25203 - Make 'make test' exit(1) if a test fails; fix some unit tests
25204 - Make tor fail when you use a config option it doesn't know about,
25205 rather than warn and continue.
25206 - Make --version work
25207 - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
25210 Changes in version 0.0.2pre23 - 2004-02-29
25212 - Print a statement when the first circ is finished, so the user
25213 knows it's working.
25214 - If a relay cell is unrecognized at the end of the circuit,
25215 send back a destroy. (So attacks to mutate cells are more
25217 - New config option 'excludenodes' to avoid certain nodes for circuits.
25218 - When it daemonizes, it chdir's to the DataDirectory rather than "/",
25219 so you can collect coredumps there.
25221 - Fix a bug in tls flushing where sometimes data got wedged and
25222 didn't flush until more data got sent. Hopefully this bug was
25223 a big factor in the random delays we were seeing.
25224 - Make 'connected' cells include the resolved IP, so the client
25225 dns cache actually gets populated.
25226 - Disallow changing from ORPort=0 to ORPort>0 on hup.
25227 - When we time-out on a stream and detach from the circuit, send an
25228 end cell down it first.
25229 - Only warn about an unknown router (in exitnodes, entrynodes,
25230 excludenodes) after we've fetched a directory.
25233 Changes in version 0.0.2pre22 - 2004-02-26
25235 - Servers publish less revealing uname information in descriptors.
25236 - More memory tracking and assertions, to crash more usefully when
25238 - If the default torrc isn't there, just use some default defaults.
25239 Plus provide an internal dirservers file if they don't have one.
25240 - When the user tries to use Tor as an http proxy, give them an http
25241 501 failure explaining that we're a socks proxy.
25242 - Dump a new router.desc on hup, to help confused people who change
25243 their exit policies and then wonder why router.desc doesn't reflect
25245 - Clean up the generic tor.sh init script that we ship with.
25247 - If the exit stream is pending on the resolve, and a destroy arrives,
25248 then the stream wasn't getting removed from the pending list. I
25249 think this was the one causing recent server crashes.
25250 - Use a more robust poll on OSX 10.3, since their poll is flaky.
25251 - When it couldn't resolve any dirservers, it was useless from then on.
25252 Now it reloads the RouterFile (or default dirservers) if it has no
25254 - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
25255 many users don't even *have* a /usr/local/sbin/.
25258 Changes in version 0.0.2pre21 - 2004-02-18
25260 - There's a ChangeLog file that actually reflects the changelog.
25261 - There's a 'torify' wrapper script, with an accompanying
25262 tor-tsocks.conf, that simplifies the process of using tsocks for
25263 tor. It even has a man page.
25264 - The tor binary gets installed to sbin rather than bin now.
25265 - Retry streams where the connected cell hasn't arrived in 15 seconds
25266 - Clean up exit policy handling -- get the default out of the torrc,
25267 so we can update it without forcing each server operator to fix
25269 - Allow imaps and pop3s in default exit policy
25271 - Prevent picking middleman nodes as the last node in the circuit
25274 Changes in version 0.0.2pre20 - 2004-01-30
25276 - We now have a deb package, and it's in debian unstable. Go to
25277 it, apt-getters. :)
25278 - I've split the TotalBandwidth option into BandwidthRate (how many
25279 bytes per second you want to allow, long-term) and
25280 BandwidthBurst (how many bytes you will allow at once before the cap
25281 kicks in). This better token bucket approach lets you, say, set
25282 BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
25283 performance while not exceeding your monthly bandwidth quota.
25284 - Push out a tls record's worth of data once you've got it, rather
25285 than waiting until you've read everything waiting to be read. This
25286 may improve performance by pipelining better. We'll see.
25287 - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
25288 from failed circuits (if they haven't been connected yet) and attach
25290 - Expire old streams that haven't managed to connect. Some day we'll
25291 have them reattach to new circuits instead.
25294 - Fix several memory leaks that were causing servers to become bloated
25296 - Fix a few very rare assert triggers. A few more remain.
25297 - Setuid to User _before_ complaining about running as root.
25300 Changes in version 0.0.2pre19 - 2004-01-07
25302 - Fix deadlock condition in dns farm. We were telling a child to die by
25303 closing the parent's file descriptor to him. But newer children were
25304 inheriting the open file descriptor from the parent, and since they
25305 weren't closing it, the socket never closed, so the child never read
25306 eof, so he never knew to exit. Similarly, dns workers were holding
25307 open other sockets, leading to all sorts of chaos.
25308 - New cleaner daemon() code for forking and backgrounding.
25309 - If you log to a file, it now prints an entry at the top of the
25310 logfile so you know it's working.
25311 - The onionskin challenge length was 30 bytes longer than necessary.
25312 - Started to patch up the spec so it's not quite so out of date.
25315 Changes in version 0.0.2pre18 - 2004-01-02
25317 - Fix endian issues with the 'integrity' field in the relay header.
25318 - Fix a potential bug where connections in state
25319 AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
25322 Changes in version 0.0.2pre17 - 2003-12-30
25324 - Made --debuglogfile (or any second log file, actually) work.
25325 - Resolved an edge case in get_unique_circ_id_by_conn where a smart
25326 adversary could force us into an infinite loop.
25329 - Each onionskin handshake now includes a hash of the computed key,
25330 to prove the server's identity and help perfect forward secrecy.
25331 - Changed cell size from 256 to 512 bytes (working toward compatibility
25333 - Changed cell length to 2 bytes, and moved it to the relay header.
25334 - Implemented end-to-end integrity checking for the payloads of
25336 - Separated streamid from 'recognized' (otherwise circuits will get
25337 messed up when we try to have streams exit from the middle). We
25338 use the integrity-checking to confirm that a cell is addressed to
25340 - Randomize the initial circid and streamid values, so an adversary who
25341 breaks into a node can't learn how many circuits or streams have
25345 Changes in version 0.0.2pre16 - 2003-12-14
25347 - Fixed a bug that made HUP trigger an assert
25348 - Fixed a bug where a circuit that immediately failed wasn't being
25349 counted as a failed circuit in counting retries.
25352 - Now we close the circuit when we get a truncated cell: otherwise we're
25353 open to an anonymity attack where a bad node in the path truncates
25354 the circuit and then we open streams at him.
25355 - Add port ranges to exit policies
25356 - Add a conservative default exit policy
25357 - Warn if you're running tor as root
25358 - on HUP, retry OR connections and close/rebind listeners
25359 - options.EntryNodes: try these nodes first when picking the first node
25360 - options.ExitNodes: if your best choices happen to include any of
25361 your preferred exit nodes, you choose among just those preferred
25363 - options.ExcludedNodes: nodes that are never picked in path building
25366 Changes in version 0.0.2pre15 - 2003-12-03
25367 o Robustness and bugfixes:
25368 - Sometimes clients would cache incorrect DNS resolves, which would
25369 really screw things up.
25370 - An OP that goes offline would slowly leak all its sockets and stop
25372 - A wide variety of bugfixes in exit node selection, exit policy
25373 handling, and processing pending streams when a new circuit is
25375 - Pick nodes for a path only from those the directory says are up
25376 - Choose randomly from all running dirservers, not always the first one
25377 - Increase allowed http header size for directory fetch.
25378 - Stop writing to stderr (if we're daemonized it will be closed).
25379 - Enable -g always, so cores will be more useful to me.
25380 - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
25383 - Wrote a man page. It lists commonly used options.
25386 - Change default loglevel to warn.
25387 - Make PidFile default to null rather than littering in your CWD.
25388 - OnionRouter config option is now obsolete. Instead it just checks
25390 - Moved to a single unified torrc file for both clients and servers.
25393 Changes in version 0.0.2pre14 - 2003-11-29
25394 o Robustness and bugfixes:
25395 - Force the admin to make the DataDirectory himself
25396 - to get ownership/permissions right
25397 - so clients no longer make a DataDirectory and then never use it
25398 - fix bug where a client who was offline for 45 minutes would never
25399 pull down a directory again
25400 - fix (or at least hide really well) the dns assert bug that was
25401 causing server crashes
25402 - warnings and improved robustness wrt clockskew for certs
25403 - use the native daemon(3) to daemonize, when available
25404 - exit if bind() fails
25405 - exit if neither socksport nor orport is defined
25406 - include our own tor_timegm (Win32 doesn't have its own)
25407 - bugfix for win32 with lots of connections
25408 - fix minor bias in PRNG
25409 - make dirserver more robust to corrupt cached directory
25412 - Wrote the design document (woo)
25414 o Circuit building and exit policies:
25415 - Circuits no longer try to use nodes that the directory has told them
25417 - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
25418 bitcounts (18.0.0.0/8).
25419 - Make AP connections standby for a circuit if no suitable circuit
25420 exists, rather than failing
25421 - Circuits choose exit node based on addr/port, exit policies, and
25422 which AP connections are standing by
25423 - Bump min pathlen from 2 to 3
25424 - Relay end cells have a payload to describe why the stream ended.
25425 - If the stream failed because of exit policy, try again with a new
25427 - Clients have a dns cache to remember resolved addresses.
25428 - Notice more quickly when we have no working circuits
25431 - APPort is now called SocksPort
25432 - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
25434 - RecommendedVersions is now a config variable rather than
25435 hardcoded (for dirservers)
25436 - Reloads config on HUP
25437 - Usage info on -h or --help
25438 - If you set User and Group config vars, it'll setu/gid to them.
25440 Changes in version 0.0.2pre13 - 2003-10-19
25441 o General stability:
25442 - SSL_write no longer fails when it returns WANTWRITE and the number
25443 of bytes in the buf has changed by the next SSL_write call.
25444 - Fix segfault fetching directory when network is down
25445 - Fix a variety of minor memory leaks
25446 - Dirservers reload the fingerprints file on HUP, so I don't have
25447 to take down the network when I approve a new router
25448 - Default server config file has explicit Address line to specify fqdn
25451 - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
25452 - Make listener connections not ever alloc bufs
25454 o Autoconf improvements:
25455 - don't clobber an external CFLAGS in ./configure
25456 - Make install now works
25457 - create var/lib/tor on make install
25458 - autocreate a tor.sh initscript to help distribs
25459 - autocreate the torrc and sample-server-torrc with correct paths
25461 o Log files and Daemonizing now work:
25462 - If --DebugLogFile is specified, log to it at -l debug
25463 - If --LogFile is specified, use it instead of commandline
25464 - If --RunAsDaemon is set, tor forks and backgrounds on startup