1 Changes in version 0.2.7.7 - 2017-03-03
2 Tor 0.2.7.7 backports a number of security fixes from later Tor
3 releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
4 this release, if for some reason they cannot upgrade to a later
7 Note that support for Tor 0.2.7.x is ending this year: we will not issue
8 any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
9 a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
11 o Directory authority changes (backport from 0.2.8.5-rc):
12 - Urras is no longer a directory authority. Closes ticket 19271.
14 o Directory authority changes (backport from 0.2.9.2-alpha):
15 - The "Tonga" bridge authority has been retired; the new bridge
16 authority is "Bifroest". Closes tickets 19728 and 19690.
18 o Directory authority key updates (backport from 0.2.8.1-alpha):
19 - Update the V3 identity key for the dannenberg directory authority:
20 it was changed on 18 November 2015. Closes task 17906. Patch
23 o Major bugfixes (parsing, security, backport from 0.2.9.8):
24 - Fix a bug in parsing that could cause clients to read a single
25 byte past the end of an allocated region. This bug could be used
26 to cause hardened clients (built with --enable-expensive-hardening)
27 to crash if they tried to visit a hostile hidden service. Non-
28 hardened clients are only affected depending on the details of
29 their platform's memory allocator. Fixes bug 21018; bugfix on
30 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
31 2016-12-002 and as CVE-2016-1254.
33 o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
34 - Stop a crash that could occur when a client running with DNSPort
35 received a query with multiple address types, and the first
36 address type was not supported. Found and fixed by Scott Dial.
37 Fixes bug 18710; bugfix on 0.2.5.4-alpha.
38 - Prevent a class of security bugs caused by treating the contents
39 of a buffer chunk as if they were a NUL-terminated string. At
40 least one such bug seems to be present in all currently used
41 versions of Tor, and would allow an attacker to remotely crash
42 most Tor instances, especially those compiled with extra compiler
43 hardening. With this defense in place, such bugs can't crash Tor,
44 though we should still fix them as they occur. Closes ticket
45 20384 (TROVE-2016-10-001).
47 o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
48 - Avoid a difficult-to-trigger heap corruption attack when extending
49 a smartlist to contain over 16GB of pointers. Fixes bug 18162;
50 bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
51 Reported by Guido Vranken.
53 o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
54 - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
55 bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
57 o Major bugfixes (key management, backport from 0.2.8.3-alpha):
58 - If OpenSSL fails to generate an RSA key, do not retain a dangling
59 pointer to the previous (uninitialized) key value. The impact here
60 should be limited to a difficult-to-trigger crash, if OpenSSL is
61 running an engine that makes key generation failures possible, or
62 if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
63 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
66 o Major bugfixes (parsing, backported from 0.3.0.4-rc):
67 - Fix an integer underflow bug when comparing malformed Tor
68 versions. This bug could crash Tor when built with
69 --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
70 0.2.9.8, which were built with -ftrapv by default. In other cases
71 it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
72 on 0.0.8pre1. Found by OSS-Fuzz.
74 o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
75 - Make memwipe() do nothing when passed a NULL pointer or buffer of
76 zero size. Check size argument to memwipe() for underflow. Fixes
77 bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
80 o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
81 - Make Tor survive errors involving connections without a
82 corresponding event object. Previously we'd fail with an
83 assertion; now we produce a log message. Related to bug 16248.
85 o Minor features (geoip):
86 - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
90 Changes in version 0.2.7.6 - 2015-12-10
91 Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
92 well as a minor bug in hidden service reliability.
94 o Major bugfixes (guard selection):
95 - Actually look at the Guard flag when selecting a new directory
96 guard. When we implemented the directory guard design, we
97 accidentally started treating all relays as if they have the Guard
98 flag during guard selection, leading to weaker anonymity and worse
99 performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
102 o Minor features (geoip):
103 - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
106 o Minor bugfixes (compilation):
107 - When checking for net/pfvar.h, include netinet/in.h if possible.
108 This fixes transparent proxy detection on OpenBSD. Fixes bug
109 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
110 - Fix a compilation warning with Clang 3.6: Do not check the
111 presence of an address which can never be NULL. Fixes bug 17781.
113 o Minor bugfixes (correctness):
114 - When displaying an IPv6 exit policy, include the mask bits
115 correctly even when the number is greater than 31. Fixes bug
116 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
117 - The wrong list was used when looking up expired intro points in a
118 rend service object, causing what we think could be reachability
119 issues for hidden services, and triggering a BUG log. Fixes bug
120 16702; bugfix on 0.2.7.2-alpha.
121 - Fix undefined behavior in the tor_cert_checksig function. Fixes
122 bug 17722; bugfix on 0.2.7.2-alpha.
125 Changes in version 0.2.7.5 - 2015-11-20
126 The Tor 0.2.7 release series is dedicated to the memory of Tor user
127 and privacy advocate Caspar Bowden (1961-2015). Caspar worked
128 tirelessly to advocate human rights regardless of national borders,
129 and oppose the encroachments of mass surveillance. He opposed national
130 exceptionalism, he brought clarity to legal and policy debates, he
131 understood and predicted the impact of mass surveillance on the world,
132 and he laid the groundwork for resisting it. While serving on the Tor
133 Project's board of directors, he brought us his uncompromising focus
134 on technical excellence in the service of humankind. Caspar was an
135 inimitable force for good and a wonderful friend. He was kind,
136 humorous, generous, gallant, and believed we should protect one
137 another without exception. We honor him here for his ideals, his
138 efforts, and his accomplishments. Please honor his memory with works
139 that would make him proud.
141 Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
143 The 0.2.7 series adds a more secure identity key type for relays,
144 improves cryptography performance, resolves several longstanding
145 hidden-service performance issues, improves controller support for
146 hidden services, and includes small bugfixes and performance
147 improvements throughout the program. This release series also includes
148 more tests than before, and significant simplifications to which parts
149 of Tor invoke which others.
151 (This release contains no code changes since 0.2.7.4-rc.)
154 Changes in version 0.2.7.4-rc - 2015-10-21
155 Tor 0.2.7.4-rc is the second release candidate in the 0.2.7 series. It
156 fixes some important memory leaks, and a scary-looking (but mostly
157 harmless in practice) invalid-read bug. It also has a few small
158 bugfixes, notably fixes for compilation and portability on different
159 platforms. If no further significant bounds are found, the next
160 release will the the official stable release.
162 o Major bugfixes (security, correctness):
163 - Fix an error that could cause us to read 4 bytes before the
164 beginning of an openssl string. This bug could be used to cause
165 Tor to crash on systems with unusual malloc implementations, or
166 systems with unusual hardening installed. Fixes bug 17404; bugfix
169 o Major bugfixes (correctness):
170 - Fix a use-after-free bug in validate_intro_point_failure(). Fixes
171 bug 17401; bugfix on 0.2.7.3-rc.
173 o Major bugfixes (memory leaks):
174 - Fix a memory leak in ed25519 batch signature checking. Fixes bug
175 17398; bugfix on 0.2.6.1-alpha.
176 - Fix a memory leak in rend_cache_failure_entry_free(). Fixes bug
177 17402; bugfix on 0.2.7.3-rc.
178 - Fix a memory leak when reading an expired signing key from disk.
179 Fixes bug 17403; bugfix on 0.2.7.2-rc.
181 o Minor features (geoIP):
182 - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
185 o Minor bugfixes (compilation):
186 - Repair compilation with the most recent (unreleased, alpha)
187 vesions of OpenSSL 1.1. Fixes part of ticket 17237.
188 - Fix an integer overflow warning in test_crypto_slow.c. Fixes bug
189 17251; bugfix on 0.2.7.2-alpha.
190 - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
191 bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
193 o Minor bugfixes (portability):
194 - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
195 of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak.
197 o Minor bugfixes (sandbox):
198 - Add the "hidserv-stats" filename to our sandbox filter for the
199 HiddenServiceStatistics option to work properly. Fixes bug 17354;
200 bugfix on tor-0.2.6.2-alpha. Patch from David Goulet.
202 o Minor bugfixes (testing):
203 - Add unit tests for get_interface_address* failure cases. Fixes bug
204 17173; bugfix on 0.2.7.3-rc. Patch by fk/teor.
205 - Fix breakage when running 'make check' with BSD make. Fixes bug
206 17154; bugfix on 0.2.7.3-rc. Patch by Marcin Cieślak.
207 - Make the get_ifaddrs_* unit tests more tolerant of different
208 network configurations. (Don't assume every test box has an IPv4
209 address, and don't assume every test box has a non-localhost
210 address.) Fixes bug 17255; bugfix on 0.2.7.3-rc. Patch by "teor".
211 - Skip backtrace tests when backtrace support is not compiled in.
212 Fixes part of bug 17151; bugfix on 0.2.7.1-alpha. Patch from
216 - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
217 - Note that HiddenServicePorts can take a unix domain socket. Closes
221 Changes in version 0.2.7.3-rc - 2015-09-25
222 Tor 0.2.7.3-rc is the first release candidate in the 0.2.7 series. It
223 contains numerous usability fixes for Ed25519 keys, safeguards against
224 several misconfiguration problems, significant simplifications to
225 Tor's callgraph, and numerous bugfixes and small features.
227 This is the most tested release of Tor to date. The unit tests cover
228 39.40% of the code, and the integration tests (accessible with "make
229 test-full-online", requiring stem and chutney and a network
230 connection) raise the coverage to 64.49%.
232 o Major features (security, hidden services):
233 - Hidden services, if using the EntryNodes option, are required to
234 use more than one EntryNode, in order to avoid a guard discovery
235 attack. (This would only affect people who had configured hidden
236 services and manually specified the EntryNodes option with a
237 single entry-node. The impact was that it would be easy to
238 remotely identify the guard node used by such a hidden service.
239 See ticket for more information.) Fixes ticket 14917.
241 o Major features (Ed25519 keys, keypinning):
242 - The key-pinning option on directory authorities is now advisory-
243 only by default. In a future version, or when the AuthDirPinKeys
244 option is set, pins are enforced again. Disabling key-pinning
245 seemed like a good idea so that we can survive the fallout of any
246 usability problems associated with Ed25519 keys. Closes
249 o Major features (Ed25519 performance):
250 - Improve the speed of Ed25519 operations and Curve25519 keypair
251 generation when built targeting 32 bit x86 platforms with SSE2
252 available. Implements ticket 16535.
253 - Improve the runtime speed of Ed25519 signature verification by
254 using Ed25519-donna's batch verification support. Implements
257 o Major features (performance testing):
258 - The test-network.sh script now supports performance testing.
259 Requires corresponding chutney performance testing changes. Patch
260 by "teor". Closes ticket 14175.
262 o Major features (relay, Ed25519):
263 - Significant usability improvements for Ed25519 key management. Log
264 messages are better, and the code can recover from far more
265 failure conditions. Thanks to "s7r" for reporting and diagnosing
267 - Add a new OfflineMasterKey option to tell Tor never to try loading
268 or generating a secret Ed25519 identity key. You can use this in
269 combination with tor --keygen to manage offline and/or encrypted
270 Ed25519 keys. Implements ticket 16944.
271 - Add a --newpass option to allow changing or removing the
272 passphrase of an encrypted key with tor --keygen. Implements part
274 - On receiving a HUP signal, check to see whether the Ed25519
275 signing key has changed, and reload it if so. Closes ticket 16790.
277 o Major bugfixes (relay, Ed25519):
278 - Avoid crashing on 'tor --keygen'. Fixes bug 16679; bugfix on
279 0.2.7.2-alpha. Reported by "s7r".
280 - Improve handling of expired signing keys with offline master keys.
281 Fixes bug 16685; bugfix on 0.2.7.2-alpha. Reported by "s7r".
283 o Minor features (client-side privacy):
284 - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
285 lifespan when IsolateSOCKSAuth and streams with SOCKS
286 authentication are attached to the circuit. This allows
287 applications like TorBrowser to manage circuit lifetime on their
288 own. Implements feature 15482.
289 - When logging malformed hostnames from SOCKS5 requests, respect
290 SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
292 o Minor features (compilation):
293 - Give a warning as early as possible when trying to build with an
294 unsupported OpenSSL version. Closes ticket 16901.
295 - Fail during configure if we're trying to build against an OpenSSL
296 built without ECC support. Fixes bug 17109, bugfix on 0.2.7.1-alpha
297 which started requiring ECC.
299 o Minor features (geoip):
300 - Update geoip and geoip6 to the September 3 2015 Maxmind GeoLite2
303 o Minor features (hidden services):
304 - Relays need to have the Fast flag to get the HSDir flag. As this
305 is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
306 drop. This change should make some attacks against the hidden
307 service directory system harder. Fixes ticket 15963.
308 - Turn on hidden service statistics collection by setting the torrc
309 option HiddenServiceStatistics to "1" by default. (This keeps
310 track only of the fraction of traffic used by hidden services, and
311 the total number of hidden services in existence.) Closes
313 - Client now uses an introduction point failure cache to know when
314 to fetch or keep a descriptor in their cache. Previously, failures
315 were recorded implicitly, but not explicitly remembered. Closes
318 o Minor features (testing, authorities, documentation):
319 - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
320 explicitly manage consensus flags in testing networks. Patch by
321 "robgjansen", modified by "teor". Implements part of ticket 14882.
323 o Minor bugfixes (security, exit policies):
324 - ExitPolicyRejectPrivate now also rejects the relay's published
325 IPv6 address (if any), and any publicly routable IPv4 or IPv6
326 addresses on any local interfaces. ticket 17027. Patch by "teor".
327 Fixes bug 17027; bugfix on 0.2.0.11-alpha.
329 o Minor bug fixes (torrc exit policies):
330 - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
331 produce IPv6 wildcard addresses. Previously they would produce
332 both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
333 of bug 16069; bugfix on 0.2.4.7-alpha.
334 - When parsing torrc ExitPolicies, we now warn for a number of cases
335 where the user's intent is likely to differ from Tor's actual
336 behavior. These include: using an IPv4 address with an accept6 or
337 reject6 line; using "private" on an accept6 or reject6 line; and
338 including any ExitPolicy lines after accept *:* or reject *:*.
339 Related to ticket 16069.
340 - When parsing torrc ExitPolicies, we now issue an info-level
341 message when expanding an "accept/reject *" line to include both
342 IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
343 - In each instance above, usage advice is provided to avoid the
344 message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
345 16069; bugfix on 0.2.4.7-alpha.
347 o Minor bugfixes (authority):
348 - Don't assign "HSDir" to a router if it isn't Valid and Running.
349 Fixes bug 16524; bugfix on 0.2.7.2-alpha.
350 - Downgrade log messages about Ed25519 key issues if they are in old
351 cached router descriptors. Fixes part of bug 16286; bugfix
353 - When we find an Ed25519 key issue in a cached descriptor, stop
354 saying the descriptor was just "uploaded". Fixes another part of
355 bug 16286; bugfix on 0.2.7.2-alpha.
357 o Minor bugfixes (control port):
358 - Repair a warning and a spurious result when getting the maximum
359 number of file descriptors from the controller. Fixes bug 16697;
360 bugfix on 0.2.7.2-alpha.
362 o Minor bugfixes (correctness):
363 - When calling channel_free_list(), avoid calling smartlist_remove()
364 while inside a FOREACH loop. This partially reverts commit
365 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
366 incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
368 o Minor bugfixes (documentation):
369 - Advise users on how to configure separate IPv4 and IPv6 exit
370 policies in the manpage and sample torrcs. Related to ticket 16069.
371 - Fix the usage message of tor-resolve(1) so that it no longer lists
372 the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
373 - Fix an error in the manual page and comments for
374 TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
375 required "ORPort connectivity". While this is true, it is in no
376 way unique to the HSDir flag. Of all the flags, only HSDirs need a
377 DirPort configured in order for the authorities to assign that
378 particular flag. Patch by "teor". Fixed as part of 14882; bugfix
381 o Minor bugfixes (Ed25519):
382 - Fix a memory leak when reading router descriptors with expired
383 Ed25519 certificates. Fixes bug 16539; bugfix on 0.2.7.2-alpha.
385 o Minor bugfixes (linux seccomp2 sandbox):
386 - Allow bridge authorities to run correctly under the seccomp2
387 sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
388 - Allow routers with ed25519 keys to run correctly under the
389 seccomp2 sandbox. Fixes bug 16965; bugfix on 0.2.7.2-alpha.
391 o Minor bugfixes (open file limit):
392 - Fix set_max_file_descriptors() to set by default the max open file
393 limit to the current limit when setrlimit() fails. Fixes bug
394 16274; bugfix on tor- 0.2.0.10-alpha. Patch by dgoulet.
396 o Minor bugfixes (portability):
397 - Try harder to normalize the exit status of the Tor process to the
398 standard-provided range. Fixes bug 16975; bugfix on every version
400 - Check correctly for Windows socket errors in the workqueue
401 backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
402 - Fix the behavior of crypto_rand_time_range() when told to consider
403 times before 1970. (These times were possible when running in a
404 simulated network environment where time()'s output starts at
405 zero.) Fixes bug 16980; bugfix on 0.2.7.1-alpha.
406 - Restore correct operation of TLS client-cipher detection on
407 OpenSSL 1.1. Fixes bug 14047; bugfix on 0.2.7.2-alpha.
409 o Minor bugfixes (relay):
410 - Ensure that worker threads actually exit when a fatal error or
411 shutdown is indicated. This fix doesn't currently affect the
412 behavior of Tor, because Tor workers never indicates fatal error
413 or shutdown except in the unit tests. Fixes bug 16868; bugfix
415 - Unblock threads before releasing the work queue mutex to ensure
416 predictable scheduling behavior. Fixes bug 16644; bugfix
419 o Code simplification and refactoring:
420 - Change the function that's called when we need to retry all
421 downloads so that it only reschedules the downloads to happen
422 immediately, rather than launching them all at once itself. This
423 further simplifies Tor's callgraph.
424 - Move some format-parsing functions out of crypto.c and
425 crypto_curve25519.c into crypto_format.c and/or util_format.c.
426 - Move the client-only parts of init_keys() into a separate
427 function. Closes ticket 16763.
428 - Simplify the microdesc_free() implementation so that it no longer
429 appears (to code analysis tools) to potentially invoke a huge
430 suite of other microdesc functions.
431 - Simply the control graph further by deferring the inner body of
432 directory_all_unreachable() into a callback. Closes ticket 16762.
433 - Treat the loss of an owning controller as equivalent to a SIGTERM
434 signal. This removes a tiny amount of duplicated code, and
435 simplifies our callgraph. Closes ticket 16788.
436 - When generating an event to send to the controller, we no longer
437 put the event over the network immediately. Instead, we queue
438 these events, and use a Libevent callback to deliver them. This
439 change simplifies Tor's callgraph by reducing the number of
440 functions from which all other Tor functions are reachable. Closes
442 - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
443 that try to scan or compile every file on Unix won't decide that
445 - Remove the unused "nulterminate" argument from buf_pullup().
448 - Recommend a 40 GB example AccountingMax in torrc.sample rather
449 than a 4 GB max. Closes ticket 16742.
450 - Include the TUNING document in our source tarball. It is referred
451 to in the ChangeLog and an error message. Fixes bug 16929; bugfix
455 - The internal pure-C tor-fw-helper tool is now removed from the Tor
456 distribution, in favor of the pure-Go clone available from
457 https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
458 used by the C tor-fw-helper are not, in our opinion, very
459 confidence- inspiring in their secure-programming techniques.
461 - Remove the code that would try to aggressively flush controller
462 connections while writing to them. This code was introduced in
463 0.1.2.7-alpha, in order to keep output buffers from exceeding
464 their limits. But there is no longer a maximum output buffer size,
465 and flushing data in this way caused some undesirable recursions
466 in our call graph. Closes ticket 16480.
469 - Make "bridges+hs" the default test network. This tests almost all
470 tor functionality during make test-network, while allowing tests
471 to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
472 test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
473 (chutney). Patches by "teor".
474 - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
475 by-side in the same parent directory. Closes ticket 16903. Patch
477 - Use environment variables rather than autoconf substitutions to
478 send variables from the build system to the test scripts. This
479 change should be easier to maintain, and cause 'make distcheck' to
480 work better than before. Fixes bug 17148.
481 - Add a new set of callgraph analysis scripts that use clang to
482 produce a list of which Tor functions are reachable from which
483 other Tor functions. We're planning to use these to help simplify
484 our code structure by identifying illogical dependencies.
485 - Add new 'test-full' and 'test-full-online' targets to run all
486 tests, including integration tests with stem and chutney.
487 - Make the test-workqueue test work on Windows by initializing the
488 network before we begin.
489 - New make target (make test-network-all) to run multiple applicable
490 chutney test cases. Patch from Teor; closes 16953.
491 - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
492 functions in dns.c. Implements a portion of ticket 16831.
493 - When building Tor with testing coverage enabled, run Chutney tests
494 (if any) using the 'tor-cov' coverage binary.
495 - When running test-network or test-stem, check for the absence of
496 stem/chutney before doing any build operations.
499 Changes in version 0.2.7.2-alpha - 2015-07-27
500 This, the second alpha in the Tor 0.2.7 series, has a number of new
501 features, including a way to manually pick the number of introduction
502 points for hidden services, and the much stronger Ed25519 signing key
503 algorithm for regular Tor relays (including support for encrypted
504 offline identity keys in the new algorithm).
506 Support for Ed25519 on relays is currently limited to signing router
507 descriptors; later alphas in this series will extend Ed25519 key
508 support to more parts of the Tor protocol.
510 o Major features (Ed25519 identity keys, Proposal 220):
511 - All relays now maintain a stronger identity key, using the Ed25519
512 elliptic curve signature format. This master key is designed so
513 that it can be kept offline. Relays also generate an online
514 signing key, and a set of other Ed25519 keys and certificates.
515 These are all automatically regenerated and rotated as needed.
516 Implements part of ticket 12498.
517 - Directory authorities now vote on Ed25519 identity keys along with
518 RSA1024 keys. Implements part of ticket 12498.
519 - Directory authorities track which Ed25519 identity keys have been
520 used with which RSA1024 identity keys, and do not allow them to
521 vary freely. Implements part of ticket 12498.
522 - Microdescriptors now include Ed25519 identity keys. Implements
523 part of ticket 12498.
524 - Add support for offline encrypted Ed25519 master keys. To use this
525 feature on your tor relay, run "tor --keygen" to make a new master
526 key (or to make a new signing key if you already have a master
527 key). Closes ticket 13642.
529 o Major features (Hidden services):
530 - Add the torrc option HiddenServiceNumIntroductionPoints, to
531 specify a fixed number of introduction points. Its maximum value
532 is 10 and default is 3. Using this option can increase a hidden
533 service's reliability under load, at the cost of making it more
534 visible that the hidden service is facing extra load. Closes
536 - Remove the adaptive algorithm for choosing the number of
537 introduction points, which used to change the number of
538 introduction points (poorly) depending on the number of
539 connections the HS sees. Closes ticket 4862.
541 o Major features (onion key cross-certification):
542 - Relay descriptors now include signatures of their own identity
543 keys, made using the TAP and ntor onion keys. These signatures
544 allow relays to prove ownership of their own onion keys. Because
545 of this change, microdescriptors will no longer need to include
546 RSA identity keys. Implements proposal 228; closes ticket 12499.
548 o Major features (performance):
549 - Improve the runtime speed of Ed25519 operations by using the
550 public-domain Ed25519-donna by Andrew M. ("floodyberry").
551 Implements ticket 16467.
552 - Improve the runtime speed of the ntor handshake by using an
553 optimized curve25519 basepoint scalarmult implementation from the
554 public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
555 ideas by Adam Langley. Implements ticket 9663.
557 o Major bugfixes (client-side privacy, also in 0.2.6.9):
558 - Properly separate out each SOCKSPort when applying stream
559 isolation. The error occurred because each port's session group
560 was being overwritten by a default value when the listener
561 connection was initialized. Fixes bug 16247; bugfix on
562 0.2.6.3-alpha. Patch by "jojelino".
564 o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
565 - Stop refusing to store updated hidden service descriptors on a
566 client. This reverts commit 9407040c59218 (which indeed fixed bug
567 14219, but introduced a major hidden service reachability
568 regression detailed in bug 16381). This is a temporary fix since
569 we can live with the minor issue in bug 14219 (it just results in
570 some load on the network) but the regression of 16381 is too much
571 of a setback. First-round fix for bug 16381; bugfix
574 o Major bugfixes (hidden services):
575 - When cannibalizing a circuit for an introduction point, always
576 extend to the chosen exit node (creating a 4 hop circuit).
577 Previously Tor would use the current circuit exit node, which
578 changed the original choice of introduction point, and could cause
579 the hidden service to skip excluded introduction points or
580 reconnect to a skipped introduction point. Fixes bug 16260; bugfix
583 o Major bugfixes (open file limit):
584 - The open file limit wasn't checked before calling
585 tor_accept_socket_nonblocking(), which would make Tor exceed the
586 limit. Now, before opening a new socket, Tor validates the open
587 file limit just before, and if the max has been reached, return an
588 error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
590 o Major bugfixes (stability, also in 0.2.6.10):
591 - Stop crashing with an assertion failure when parsing certain kinds
592 of malformed or truncated microdescriptors. Fixes bug 16400;
593 bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
594 by "cypherpunks_backup".
595 - Stop random client-side assertion failures that could occur when
596 connecting to a busy hidden service, or connecting to a hidden
597 service while a NEWNYM is in progress. Fixes bug 16013; bugfix
600 o Minor features (directory authorities, security, also in 0.2.6.9):
601 - The HSDir flag given by authorities now requires the Stable flag.
602 For the current network, this results in going from 2887 to 2806
603 HSDirs. Also, it makes it harder for an attacker to launch a sybil
604 attack by raising the effort for a relay to become Stable to
605 require at the very least 7 days, while maintaining the 96 hours
606 uptime requirement for HSDir. Implements ticket 8243.
608 o Minor features (client):
609 - Relax the validation of hostnames in SOCKS5 requests, allowing the
610 character '_' to appear, in order to cope with domains observed in
611 the wild that are serving non-RFC compliant records. Resolves
613 - Relax the validation done to hostnames in SOCKS5 requests, and
614 allow a single trailing '.' to cope with clients that pass FQDNs
615 using that syntax to explicitly indicate that the domain name is
616 fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
617 - Add GroupWritable and WorldWritable options to unix-socket based
618 SocksPort and ControlPort options. These options apply to a single
619 socket, and override {Control,Socks}SocketsGroupWritable. Closes
622 o Minor features (control protocol):
623 - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
624 the control protocol. Resolves ticket 15358.
626 o Minor features (directory authorities):
627 - Directory authorities no longer vote against the "Fast", "Stable",
628 and "HSDir" flags just because they were going to vote against
629 "Running": if the consensus turns out to be that the router was
630 running, then the authority's vote should count. Patch from Peter
631 Retzlaff; closes issue 8712.
633 o Minor features (geoip, also in 0.2.6.10):
634 - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
635 - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
637 o Minor features (hidden services):
638 - Add the new options "HiddenServiceMaxStreams" and
639 "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
640 limit the maximum number of simultaneous streams per circuit, and
641 optionally tear down the circuit when the limit is exceeded. Part
644 o Minor features (portability):
645 - Use C99 variadic macros when the compiler is not GCC. This avoids
646 failing compilations on MSVC, and fixes a log-file-based race
647 condition in our old workarounds. Original patch from Gisle Vanem.
649 o Minor bugfixes (compilation, also in 0.2.6.9):
650 - Build with --enable-systemd correctly when libsystemd is
651 installed, but systemd is not. Fixes bug 16164; bugfix on
652 0.2.6.3-alpha. Patch from Peter Palfrader.
654 o Minor bugfixes (controller):
655 - Add the descriptor ID in each HS_DESC control event. It was
656 missing, but specified in control-spec.txt. Fixes bug 15881;
657 bugfix on 0.2.5.2-alpha.
659 o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
660 - Check for failures from crypto_early_init, and refuse to continue.
661 A previous typo meant that we could keep going with an
662 uninitialized crypto library, and would have OpenSSL initialize
663 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
664 when implementing ticket 4900. Patch by "teor".
666 o Minor bugfixes (hidden services):
667 - Fix a crash when reloading configuration while at least one
668 configured and one ephemeral hidden service exists. Fixes bug
669 16060; bugfix on 0.2.7.1-alpha.
670 - Avoid crashing with a double-free bug when we create an ephemeral
671 hidden service but adding it fails for some reason. Fixes bug
672 16228; bugfix on 0.2.7.1-alpha.
674 o Minor bugfixes (Linux seccomp2 sandbox):
675 - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
676 defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
678 o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
679 - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
680 these when eventfd2() support is missing. Fixes bug 16363; bugfix
681 on 0.2.6.3-alpha. Patch from "teor".
683 o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
684 - Fix sandboxing to work when running as a relay, by allowing the
685 renaming of secret_id_key, and allowing the eventfd2 and futex
686 syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
688 - Allow systemd connections to work with the Linux seccomp2 sandbox
689 code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
692 o Minor bugfixes (relay):
693 - Fix a rarely-encountered memory leak when failing to initialize
694 the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
697 o Minor bugfixes (systemd):
698 - Fix an accidental formatting error that broke the systemd
699 configuration file. Fixes bug 16152; bugfix on 0.2.7.1-alpha.
700 - Tor's systemd unit file no longer contains extraneous spaces.
701 These spaces would sometimes confuse tools like deb-systemd-
702 helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
704 o Minor bugfixes (tests):
705 - Use the configured Python executable when running test-stem-full.
706 Fixes bug 16470; bugfix on 0.2.7.1-alpha.
708 o Minor bugfixes (tests, also in 0.2.6.9):
709 - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
710 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
712 o Minor bugfixes (threads, comments):
713 - Always initialize return value in compute_desc_id in rendcommon.c
714 Patch by "teor". Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
715 - Check for NULL values in getinfo_helper_onions(). Patch by "teor".
716 Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
717 - Remove undefined directive-in-macro in test_util_writepid clang
718 3.7 complains that using a preprocessor directive inside a macro
719 invocation in test_util_writepid in test_util.c is undefined.
720 Patch by "teor". Fixes part of bug 16115; bugfix on 0.2.7.1-alpha.
722 o Code simplification and refactoring:
723 - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
724 to ensure they remain consistent and visible everywhere.
725 - Remove some vestigial workarounds for the MSVC6 compiler. We
726 haven't supported that in ages.
727 - The link authentication code has been refactored for better
728 testability and reliability. It now uses code generated with the
729 "trunnel" binary encoding generator, to reduce the risk of bugs
730 due to programmer error. Done as part of ticket 12498.
733 - Include a specific and (hopefully) accurate documentation of the
734 torrc file's meta-format in doc/torrc_format.txt. This is mainly
735 of interest to people writing programs to parse or generate torrc
736 files. This document is not a commitment to long-term
737 compatibility; some aspects of the current format are a bit
738 ridiculous. Closes ticket 2325.
741 - Tor no longer supports copies of OpenSSL that are missing support
742 for Elliptic Curve Cryptography. (We began using ECC when
743 available in 0.2.4.8-alpha, for more safe and efficient key
744 negotiation.) In particular, support for at least one of P256 or
745 P224 is now required, with manual configuration needed if only
746 P224 is available. Resolves ticket 16140.
747 - Tor no longer supports versions of OpenSSL before 1.0. (If you are
748 on an operating system that has not upgraded to OpenSSL 1.0 or
749 later, and you compile Tor from source, you will need to install a
750 more recent OpenSSL to link Tor against.) These versions of
751 OpenSSL are still supported by the OpenSSL, but the numerous
752 cryptographic improvements in later OpenSSL releases makes them a
753 clear choice. Resolves ticket 16034.
754 - Remove the HidServDirectoryV2 option. Now all relays offer to
755 store hidden service descriptors. Related to 16543.
756 - Remove the VoteOnHidServDirectoriesV2 option, since all
757 authorities have long set it to 1. Closes ticket 16543.
760 - Document use of coverity, clang static analyzer, and clang dynamic
761 undefined behavior and address sanitizers in doc/HACKING. Include
762 detailed usage instructions in the blacklist. Patch by "teor".
764 - The link authentication protocol code now has extensive tests.
765 - The relay descriptor signature testing code now has
767 - The test_workqueue program now runs faster, and is enabled by
768 default as a part of "make check".
769 - Now that OpenSSL has its own scrypt implementation, add an unit
770 test that checks for interoperability between libscrypt_scrypt()
771 and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
772 and rely on EVP_PBE_scrypt() whenever possible. Resolves
776 Changes in version 0.2.6.10 - 2015-07-12
777 Tor version 0.2.6.10 fixes some significant stability and hidden
778 service client bugs, bulletproofs the cryptography init process, and
779 fixes a bug when using the sandbox code with some older versions of
780 Linux. Everyone running an older version, especially an older version
781 of 0.2.6, should upgrade.
783 o Major bugfixes (hidden service clients, stability):
784 - Stop refusing to store updated hidden service descriptors on a
785 client. This reverts commit 9407040c59218 (which indeed fixed bug
786 14219, but introduced a major hidden service reachability
787 regression detailed in bug 16381). This is a temporary fix since
788 we can live with the minor issue in bug 14219 (it just results in
789 some load on the network) but the regression of 16381 is too much
790 of a setback. First-round fix for bug 16381; bugfix
793 o Major bugfixes (stability):
794 - Stop crashing with an assertion failure when parsing certain kinds
795 of malformed or truncated microdescriptors. Fixes bug 16400;
796 bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
797 by "cypherpunks_backup".
798 - Stop random client-side assertion failures that could occur when
799 connecting to a busy hidden service, or connecting to a hidden
800 service while a NEWNYM is in progress. Fixes bug 16013; bugfix
803 o Minor features (geoip):
804 - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
805 - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
807 o Minor bugfixes (crypto error-handling):
808 - Check for failures from crypto_early_init, and refuse to continue.
809 A previous typo meant that we could keep going with an
810 uninitialized crypto library, and would have OpenSSL initialize
811 its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
812 when implementing ticket 4900. Patch by "teor".
814 o Minor bugfixes (Linux seccomp2 sandbox):
815 - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
816 these when eventfd2() support is missing. Fixes bug 16363; bugfix
817 on 0.2.6.3-alpha. Patch from "teor".
820 Changes in version 0.2.6.9 - 2015-06-11
821 Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
822 requirements for receiving an HSDir flag, and addresses some other small
823 bugs in the systemd and sandbox code. Clients using circuit isolation
824 should upgrade; all directory authorities should upgrade.
826 o Major bugfixes (client-side privacy):
827 - Properly separate out each SOCKSPort when applying stream
828 isolation. The error occurred because each port's session group was
829 being overwritten by a default value when the listener connection
830 was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
833 o Minor feature (directory authorities, security):
834 - The HSDir flag given by authorities now requires the Stable flag.
835 For the current network, this results in going from 2887 to 2806
836 HSDirs. Also, it makes it harder for an attacker to launch a sybil
837 attack by raising the effort for a relay to become Stable which
838 takes at the very least 7 days to do so and by keeping the 96
839 hours uptime requirement for HSDir. Implements ticket 8243.
841 o Minor bugfixes (compilation):
842 - Build with --enable-systemd correctly when libsystemd is
843 installed, but systemd is not. Fixes bug 16164; bugfix on
844 0.2.6.3-alpha. Patch from Peter Palfrader.
846 o Minor bugfixes (Linux seccomp2 sandbox):
847 - Fix sandboxing to work when running as a relaymby renaming of
848 secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
849 bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
850 - Allow systemd connections to work with the Linux seccomp2 sandbox
851 code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
854 o Minor bugfixes (tests):
855 - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
856 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
859 Changes in version 0.2.6.8 - 2015-05-21
860 Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
861 fixes an authority-side bug in assigning the HSDir flag. All directory
862 authorities should upgrade.
864 o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
865 - Revert commit that made directory authorities assign the HSDir
866 flag to relay without a DirPort; this was bad because such relays
867 can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
868 on tor-0.2.6.3-alpha.
870 o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
871 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
872 a client authorized hidden service. Fixes bug 15823; bugfix
875 o Minor features (geoip):
876 - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
877 - Update geoip6 to the April 8 2015 Maxmind GeoLite2
881 Changes in version 0.2.7.1-alpha - 2015-05-12
882 Tor 0.2.7.1-alpha is the first alpha release in its series. It
883 includes numerous small features and bugfixes against previous Tor
884 versions, and numerous small infrastructure improvements. The most
885 notable features are several new ways for controllers to interact with
886 the hidden services subsystem.
888 o New system requirements:
889 - Tor no longer includes workarounds to support Libevent versions
890 before 1.3e. Libevent 2.0 or later is recommended. Closes
893 o Major features (controller):
894 - Add the ADD_ONION and DEL_ONION commands that allow the creation
895 and management of hidden services via the controller. Closes
897 - New "GETINFO onions/current" and "GETINFO onions/detached"
898 commands to get information about hidden services created via the
899 controller. Part of ticket 6411.
900 - New HSFETCH command to launch a request for a hidden service
901 descriptor. Closes ticket 14847.
902 - New HSPOST command to upload a hidden service descriptor. Closes
903 ticket 3523. Patch by "DonnchaC".
905 o Major bugfixes (hidden services):
906 - Revert commit that made directory authorities assign the HSDir
907 flag to relay without a DirPort; this was bad because such relays
908 can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
909 on tor-0.2.6.3-alpha.
911 o Minor features (clock-jump tolerance):
912 - Recover better when our clock jumps back many hours, like might
913 happen for Tails or Whonix users who start with a very wrong
914 hardware clock, use Tor to discover a more accurate time, and then
915 fix their clock. Resolves part of ticket 8766.
917 o Minor features (command-line interface):
918 - Make --hash-password imply --hush to prevent unnecessary noise.
919 Closes ticket 15542. Patch from "cypherpunks".
920 - Print a warning whenever we find a relative file path being used
921 as torrc option. Resolves issue 14018.
923 o Minor features (controller):
924 - Add DirAuthority lines for default directory authorities to the
925 output of the "GETINFO config/defaults" command if not already
926 present. Implements ticket 14840.
927 - Controllers can now use "GETINFO hs/client/desc/id/..." to
928 retrieve items from the client's hidden service descriptor cache.
930 - Implement a new controller command "GETINFO status/fresh-relay-
931 descs" to fetch a descriptor/extrainfo pair that was generated on
932 demand just for the controller's use. Implements ticket 14784.
934 o Minor features (DoS-resistance):
935 - Make it harder for attackers to overload hidden services with
936 introductions, by blocking multiple introduction requests on the
937 same circuit. Resolves ticket 15515.
939 o Minor features (geoip):
940 - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
941 - Update geoip6 to the April 8 2015 Maxmind GeoLite2
944 o Minor features (HS popularity countermeasure):
945 - To avoid leaking HS popularity, don't cycle the introduction point
946 when we've handled a fixed number of INTRODUCE2 cells but instead
947 cycle it when a random number of introductions is reached, thus
948 making it more difficult for an attacker to find out the amount of
949 clients that have used the introduction point for a specific HS.
952 o Minor features (logging):
953 - Include the Tor version in all LD_BUG log messages, since people
954 tend to cut and paste those into the bugtracker. Implements
957 o Minor features (pluggable transports):
958 - When launching managed pluggable transports on Linux systems,
959 attempt to have the kernel deliver a SIGTERM on tor exit if the
960 pluggable transport process is still running. Resolves
962 - When launching managed pluggable transports, setup a valid open
963 stdin in the child process that can be used to detect if tor has
964 terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
965 can be used by implementations to detect this new behavior.
966 Resolves ticket 15435.
968 o Minor features (testing):
969 - Add a test to verify that the compiler does not eliminate our
970 memwipe() implementation. Closes ticket 15377.
971 - Add make rule `check-changes` to verify the format of changes
972 files. Closes ticket 15180.
973 - Add unit tests for control_event_is_interesting(). Add a compile-
974 time check that the number of events doesn't exceed the capacity
975 of control_event_t.event_mask. Closes ticket 15431, checks for
976 bugs similar to 13085. Patch by "teor".
977 - Command-line argument tests moved to Stem. Resolves ticket 14806.
978 - Integrate the ntor, backtrace, and zero-length keys tests into the
979 automake test suite. Closes ticket 15344.
980 - Remove assertions during builds to determine Tor's test coverage.
981 We don't want to trigger these even in assertions, so including
982 them artificially makes our branch coverage look worse than it is.
983 This patch provides the new test-stem-full and coverage-html-full
984 configure options. Implements ticket 15400.
986 o Minor bugfixes (build):
987 - Improve out-of-tree builds by making non-standard rules work and
988 clean up additional files and directories. Fixes bug 15053; bugfix
991 o Minor bugfixes (command-line interface):
992 - When "--quiet" is provided along with "--validate-config", do not
993 write anything to stdout on success. Fixes bug 14994; bugfix
995 - When complaining about bad arguments to "--dump-config", use
998 o Minor bugfixes (configuration, unit tests):
999 - Only add the default fallback directories when the DirAuthorities,
1000 AlternateDirAuthority, and FallbackDir directory config options
1001 are set to their defaults. The default fallback directory list is
1002 currently empty, this fix will only change tor's behavior when it
1003 has default fallback directories. Includes unit tests for
1004 consider_adding_dir_servers(). Fixes bug 15642; bugfix on
1005 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
1007 o Minor bugfixes (correctness):
1008 - For correctness, avoid modifying a constant string in
1009 handle_control_postdescriptor. Fixes bug 15546; bugfix
1011 - Remove side-effects from tor_assert() calls. This was harmless,
1012 because we never disable assertions, but it is bad style and
1013 unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
1016 o Minor bugfixes (hidden service):
1017 - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
1018 a client authorized hidden service. Fixes bug 15823; bugfix
1020 - Remove an extraneous newline character from the end of hidden
1021 service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
1023 o Minor bugfixes (interface):
1024 - Print usage information for --dump-config when it is used without
1025 an argument. Also, fix the error message to use different wording
1026 and add newline at the end. Fixes bug 15541; bugfix
1029 o Minor bugfixes (logs):
1030 - When building Tor under Clang, do not include an extra set of
1031 parentheses in log messages that include function names. Fixes bug
1032 15269; bugfix on every released version of Tor when compiled with
1033 recent enough Clang.
1035 o Minor bugfixes (network):
1036 - When attempting to use fallback technique for network interface
1037 lookup, disregard loopback and multicast addresses since they are
1038 unsuitable for public communications.
1040 o Minor bugfixes (statistics):
1041 - Disregard the ConnDirectionStatistics torrc options when Tor is
1042 not a relay since in that mode of operation no sensible data is
1043 being collected and because Tor might run into measurement hiccups
1044 when running as a client for some time, then becoming a relay.
1045 Fixes bug 15604; bugfix on 0.2.2.35.
1047 o Minor bugfixes (test networks):
1048 - When self-testing reachability, use ExtendAllowPrivateAddresses to
1049 determine if local/private addresses imply reachability. The
1050 previous fix used TestingTorNetwork, which implies
1051 ExtendAllowPrivateAddresses, but this excluded rare configurations
1052 where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
1053 not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
1054 issue discovered by CJ Ess.
1056 o Minor bugfixes (testing):
1057 - Check for matching value in server response in ntor_ref.py. Fixes
1058 bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
1060 - Set the severity correctly when testing
1061 get_interface_addresses_ifaddrs() and
1062 get_interface_addresses_win32(), so that the tests fail gracefully
1063 instead of triggering an assertion. Fixes bug 15759; bugfix on
1064 0.2.6.3-alpha. Reported by Nicolas Derive.
1066 o Code simplification and refactoring:
1067 - Move the hacky fallback code out of get_interface_address6() into
1068 separate function and get it covered with unit-tests. Resolves
1070 - Refactor hidden service client-side cache lookup to intelligently
1071 report its various failure cases, and disentangle failure cases
1072 involving a lack of introduction points. Closes ticket 14391.
1073 - Use our own Base64 encoder instead of OpenSSL's, to allow more
1074 control over the output. Part of ticket 15652.
1077 - Improve the descriptions of statistics-related torrc options in
1078 the manpage to describe rationale and possible uses cases. Fixes
1080 - Improve the layout and formatting of ./configure --help messages.
1081 Closes ticket 15024. Patch from "cypherpunks".
1082 - Standardize on the term "server descriptor" in the manual page.
1083 Previously, we had used "router descriptor", "server descriptor",
1084 and "relay descriptor" interchangeably. Part of ticket 14987.
1087 - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
1088 and always use the internal Base64 decoder. The internal decoder
1089 has been part of tor since tor-0.2.0.10-alpha, and no one should
1090 be using the OpenSSL one. Part of ticket 15652.
1091 - Remove the 'tor_strclear()' function; use memwipe() instead.
1092 Closes ticket 14922.
1095 - Remove the (seldom-used) DynamicDHGroups feature. For anti-
1096 fingerprinting we now recommend pluggable transports; for forward-
1097 secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
1098 - Remove the undocumented "--digests" command-line option. It
1099 complicated our build process, caused subtle build issues on
1100 multiple platforms, and is now redundant since we started
1101 including git version identifiers. Closes ticket 14742.
1102 - Tor no longer contains checks for ancient directory cache versions
1103 that didn't know about microdescriptors.
1104 - Tor no longer contains workarounds for stat files generated by
1105 super-old versions of Tor that didn't choose guards sensibly.
1108 Changes in version 0.2.4.27 - 2015-04-06
1109 Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
1110 could be used by an attacker to crash hidden services, or crash clients
1111 visiting hidden services. Hidden services should upgrade as soon as
1112 possible; clients should upgrade whenever packages become available.
1114 This release also backports a simple improvement to make hidden
1115 services a bit less vulnerable to denial-of-service attacks.
1117 o Major bugfixes (security, hidden service):
1118 - Fix an issue that would allow a malicious client to trigger an
1119 assertion failure and halt a hidden service. Fixes bug 15600;
1120 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
1121 - Fix a bug that could cause a client to crash with an assertion
1122 failure when parsing a malformed hidden service descriptor. Fixes
1123 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
1125 o Minor features (DoS-resistance, hidden service):
1126 - Introduction points no longer allow multiple INTRODUCE1 cells to
1127 arrive on the same circuit. This should make it more expensive for
1128 attackers to overwhelm hidden services with introductions.
1129 Resolves ticket 15515.
1132 Changes in version 0.2.6.7 - 2015-04-06
1133 Tor 0.2.6.7 fixes two security issues that could be used by an
1134 attacker to crash hidden services, or crash clients visiting hidden
1135 services. Hidden services should upgrade as soon as possible; clients
1136 should upgrade whenever packages become available.
1138 This release also contains two simple improvements to make hidden
1139 services a bit less vulnerable to denial-of-service attacks.
1141 o Major bugfixes (security, hidden service):
1142 - Fix an issue that would allow a malicious client to trigger an
1143 assertion failure and halt a hidden service. Fixes bug 15600;
1144 bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
1145 - Fix a bug that could cause a client to crash with an assertion
1146 failure when parsing a malformed hidden service descriptor. Fixes
1147 bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
1149 o Minor features (DoS-resistance, hidden service):
1150 - Introduction points no longer allow multiple INTRODUCE1 cells to
1151 arrive on the same circuit. This should make it more expensive for
1152 attackers to overwhelm hidden services with introductions.
1153 Resolves ticket 15515.
1154 - Decrease the amount of reattempts that a hidden service performs
1155 when its rendezvous circuits fail. This reduces the computational
1156 cost for running a hidden service under heavy load. Resolves
1160 Changes in version 0.2.6.6 - 2015-03-24
1161 Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
1163 It adds numerous safety, security, correctness, and performance
1164 improvements. Client programs can be configured to use more kinds of
1165 sockets, AutomapHosts works better, the multithreading backend is
1166 improved, cell transmission is refactored, test coverage is much
1167 higher, more denial-of-service attacks are handled, guard selection is
1168 improved to handle long-term guards better, pluggable transports
1169 should work a bit better, and some annoying hidden service performance
1170 bugs should be addressed.
1172 o Minor bugfixes (portability):
1173 - Use the correct datatype in the SipHash-2-4 function to prevent
1174 compilers from assuming any sort of alignment. Fixes bug 15436;
1175 bugfix on 0.2.5.3-alpha.
1177 Changes in version 0.2.6.5-rc - 2015-03-18
1178 Tor 0.2.6.5-rc is the second and (hopefully) last release candidate in
1179 the 0.2.6. It fixes a small number of bugs found in 0.2.6.4-rc.
1181 o Major bugfixes (client):
1182 - Avoid crashing when making certain configuration option changes on
1183 clients. Fixes bug 15245; bugfix on 0.2.6.3-alpha. Reported
1186 o Major bugfixes (pluggable transports):
1187 - Initialize the extended OR Port authentication cookie before
1188 launching pluggable transports. This prevents a race condition
1189 that occured when server-side pluggable transports would cache the
1190 authentication cookie before it has been (re)generated. Fixes bug
1191 15240; bugfix on 0.2.5.1-alpha.
1193 o Major bugfixes (portability):
1194 - Do not crash on startup when running on Solaris. Fixes a bug
1195 related to our fix for 9495; bugfix on 0.2.6.1-alpha. Reported
1198 o Minor features (heartbeat):
1199 - On relays, report how many connections we negotiated using each
1200 version of the Tor link protocols. This information will let us
1201 know if removing support for very old versions of the Tor
1202 protocols is harming the network. Closes ticket 15212.
1204 o Code simplification and refactoring:
1205 - Refactor main loop to extract the 'loop' part. This makes it
1206 easier to run Tor under Shadow. Closes ticket 15176.
1209 Changes in version 0.2.5.11 - 2015-03-17
1210 Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
1212 It backports several bugfixes from the 0.2.6 branch, including a
1213 couple of medium-level security fixes for relays and exit nodes.
1214 It also updates the list of directory authorities.
1216 o Directory authority changes:
1217 - Remove turtles as a directory authority.
1218 - Add longclaw as a new (v3) directory authority. This implements
1219 ticket 13296. This keeps the directory authority count at 9.
1220 - The directory authority Faravahar has a new IP address. This
1221 closes ticket 14487.
1223 o Major bugfixes (crash, OSX, security):
1224 - Fix a remote denial-of-service opportunity caused by a bug in
1225 OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
1228 o Major bugfixes (relay, stability, possible security):
1229 - Fix a bug that could lead to a relay crashing with an assertion
1230 failure if a buffer of exactly the wrong layout was passed to
1231 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
1232 0.2.0.10-alpha. Patch from 'cypherpunks'.
1233 - Do not assert if the 'data' pointer on a buffer is advanced to the
1234 very end of the buffer; log a BUG message instead. Only assert if
1235 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
1237 o Major bugfixes (exit node stability):
1238 - Fix an assertion failure that could occur under high DNS load.
1239 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
1240 diagnosed and fixed by "cypherpunks".
1242 o Major bugfixes (Linux seccomp2 sandbox):
1243 - Upon receiving sighup with the seccomp2 sandbox enabled, do not
1244 crash during attempts to call wait4. Fixes bug 15088; bugfix on
1245 0.2.5.1-alpha. Patch from "sanic".
1247 o Minor features (controller):
1248 - New "GETINFO bw-event-cache" to get information about recent
1249 bandwidth events. Closes ticket 14128. Useful for controllers to
1250 get recent bandwidth history after the fix for ticket 13988.
1252 o Minor features (geoip):
1253 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
1254 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
1257 o Minor bugfixes (client, automapping):
1258 - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
1259 no value follows the option. Fixes bug 14142; bugfix on
1260 0.2.4.7-alpha. Patch by "teor".
1261 - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
1262 14195; bugfix on 0.1.0.1-rc.
1264 o Minor bugfixes (compilation):
1265 - Build without warnings with the stock OpenSSL srtp.h header, which
1266 has a duplicate declaration of SSL_get_selected_srtp_profile().
1267 Fixes bug 14220; this is OpenSSL's bug, not ours.
1269 o Minor bugfixes (directory authority):
1270 - Allow directory authorities to fetch more data from one another if
1271 they find themselves missing lots of votes. Previously, they had
1272 been bumping against the 10 MB queued data limit. Fixes bug 14261;
1273 bugfix on 0.1.2.5-alpha.
1274 - Enlarge the buffer to read bwauth generated files to avoid an
1275 issue when parsing the file in dirserv_read_measured_bandwidths().
1276 Fixes bug 14125; bugfix on 0.2.2.1-alpha.
1278 o Minor bugfixes (statistics):
1279 - Increase period over which bandwidth observations are aggregated
1280 from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
1282 o Minor bugfixes (preventative security, C safety):
1283 - When reading a hexadecimal, base-32, or base-64 encoded value from
1284 a string, always overwrite the whole output buffer. This prevents
1285 some bugs where we would look at (but fortunately, not reveal)
1286 uninitialized memory on the stack. Fixes bug 14013; bugfix on all
1290 Changes in version 0.2.4.26 - 2015-03-17
1291 Tor 0.2.4.26 includes an updated list of directory authorities. It
1292 also backports a couple of stability and security bugfixes from 0.2.5
1295 o Directory authority changes:
1296 - Remove turtles as a directory authority.
1297 - Add longclaw as a new (v3) directory authority. This implements
1298 ticket 13296. This keeps the directory authority count at 9.
1299 - The directory authority Faravahar has a new IP address. This
1300 closes ticket 14487.
1302 o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
1303 - Fix an assertion failure that could occur under high DNS load.
1304 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
1305 diagnosed and fixed by "cypherpunks".
1307 o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
1308 - Fix a bug that could lead to a relay crashing with an assertion
1309 failure if a buffer of exactly the wrong layout was passed to
1310 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
1311 0.2.0.10-alpha. Patch from 'cypherpunks'.
1312 - Do not assert if the 'data' pointer on a buffer is advanced to the
1313 very end of the buffer; log a BUG message instead. Only assert if
1314 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
1316 o Minor features (geoip):
1317 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
1318 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
1321 Changes in version 0.2.6.4-rc - 2015-03-09
1322 Tor 0.2.6.4-alpha fixes an issue in the directory code that an
1323 attacker might be able to use in order to crash certain Tor
1324 directories. It also resolves some minor issues left over from, or
1325 introduced in, Tor 0.2.6.3-alpha or earlier.
1327 o Major bugfixes (crash, OSX, security):
1328 - Fix a remote denial-of-service opportunity caused by a bug in
1329 OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
1332 o Major bugfixes (relay, stability, possible security):
1333 - Fix a bug that could lead to a relay crashing with an assertion
1334 failure if a buffer of exactly the wrong layout is passed to
1335 buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
1336 0.2.0.10-alpha. Patch from "cypherpunks".
1337 - Do not assert if the 'data' pointer on a buffer is advanced to the
1338 very end of the buffer; log a BUG message instead. Only assert if
1339 it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
1341 o Major bugfixes (FreeBSD IPFW transparent proxy):
1342 - Fix address detection with FreeBSD transparent proxies, when
1343 "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
1346 o Major bugfixes (Linux seccomp2 sandbox):
1347 - Pass IPPROTO_TCP rather than 0 to socket(), so that the Linux
1348 seccomp2 sandbox doesn't fail. Fixes bug 14989; bugfix
1350 - Allow AF_UNIX hidden services to be used with the seccomp2
1351 sandbox. Fixes bug 15003; bugfix on 0.2.6.3-alpha.
1352 - Upon receiving sighup with the seccomp2 sandbox enabled, do not
1353 crash during attempts to call wait4. Fixes bug 15088; bugfix on
1354 0.2.5.1-alpha. Patch from "sanic".
1356 o Minor features (controller):
1357 - Messages about problems in the bootstrap process now include
1358 information about the server we were trying to connect to when we
1359 noticed the problem. Closes ticket 15006.
1361 o Minor features (geoip):
1362 - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
1363 - Update geoip6 to the March 3 2015 Maxmind GeoLite2
1366 o Minor features (logs):
1367 - Quiet some log messages in the heartbeat and at startup. Closes
1370 o Minor bugfixes (certificate handling):
1371 - If an authority operator accidentally makes a signing certificate
1372 with a future publication time, do not discard its real signing
1373 certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
1374 - Remove any old authority certificates that have been superseded
1375 for at least two days. Previously, we would keep superseded
1376 certificates until they expired, if they were published close in
1377 time to the certificate that superseded them. Fixes bug 11454;
1378 bugfix on 0.2.1.8-alpha.
1380 o Minor bugfixes (compilation):
1381 - Fix a compilation warning on s390. Fixes bug 14988; bugfix
1383 - Fix a compilation warning on FreeBSD. Fixes bug 15151; bugfix
1386 o Minor bugfixes (testing):
1387 - Fix endianness issues in unit test for resolve_my_address() to
1388 have it pass on big endian systems. Fixes bug 14980; bugfix on
1390 - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
1391 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
1392 - When running the new 'make test-stem' target, use the configured
1393 python binary. Fixes bug 15037; bugfix on 0.2.6.3-alpha. Patch
1395 - When running the zero-length-keys tests, do not use the default
1396 torrc file. Fixes bug 15033; bugfix on 0.2.6.3-alpha. Reported
1399 o Directory authority IP change:
1400 - The directory authority Faravahar has a new IP address. This
1401 closes ticket 14487.
1404 - Remove some lingering dead code that once supported mempools.
1405 Mempools were disabled by default in 0.2.5, and removed entirely
1406 in 0.2.6.3-alpha. Closes more of ticket 14848; patch
1410 Changes in version 0.2.6.3-alpha - 2015-02-19
1411 Tor 0.2.6.3-alpha is the third (and hopefully final) alpha release in
1412 the 0.2.6.x series. It introduces support for more kinds of sockets,
1413 makes it harder to accidentally run an exit, improves our
1414 multithreading backend, incorporates several fixes for the
1415 AutomapHostsOnResolve option, and fixes numerous other bugs besides.
1417 If no major regressions or security holes are found in this version,
1418 the next version will be a release candidate.
1420 o Deprecated versions:
1421 - Tor relays older than 0.2.4.18-rc are no longer allowed to
1422 advertise themselves on the network. Closes ticket 13555.
1424 o Major features (security, unix domain sockets):
1425 - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
1426 applications can reach Tor without having to create AF_INET or
1427 AF_INET6 sockets, meaning they can completely disable their
1428 ability to make non-Tor network connections. To create a socket of
1429 this type, use "SocksPort unix:/path/to/socket". Implements
1431 - Support mapping hidden service virtual ports to AF_UNIX sockets.
1432 The syntax is "HiddenServicePort 80 unix:/path/to/socket".
1433 Implements ticket 11485.
1435 o Major features (changed defaults):
1436 - Prevent relay operators from unintentionally running exits: When a
1437 relay is configured as an exit node, we now warn the user unless
1438 the "ExitRelay" option is set to 1. We warn even more loudly if
1439 the relay is configured with the default exit policy, since this
1440 can indicate accidental misconfiguration. Setting "ExitRelay 0"
1441 stops Tor from running as an exit relay. Closes ticket 10067.
1443 o Major features (directory system):
1444 - When downloading server- or microdescriptors from a directory
1445 server, we no longer launch multiple simultaneous requests to the
1446 same server. This reduces load on the directory servers,
1447 especially when directory guards are in use. Closes ticket 9969.
1448 - When downloading server- or microdescriptors over a tunneled
1449 connection, do not limit the length of our requests to what the
1450 Squid proxy is willing to handle. Part of ticket 9969.
1451 - Authorities can now vote on the correct digests and latest
1452 versions for different software packages. This allows packages
1453 that include Tor to use the Tor authority system as a way to get
1454 notified of updates and their correct digests. Implements proposal
1455 227. Closes ticket 10395.
1457 o Major features (guards):
1458 - Introduce the Guardfraction feature to improves load balancing on
1459 guard nodes. Specifically, it aims to reduce the traffic gap that
1460 guard nodes experience when they first get the Guard flag. This is
1461 a required step if we want to increase the guard lifetime to 9
1462 months or greater. Closes ticket 9321.
1464 o Major features (performance):
1465 - Make the CPU worker implementation more efficient by avoiding the
1466 kernel and lengthening pipelines. The original implementation used
1467 sockets to transfer data from the main thread to the workers, and
1468 didn't allow any thread to be assigned more than a single piece of
1469 work at once. The new implementation avoids communications
1470 overhead by making requests in shared memory, avoiding kernel IO
1471 where possible, and keeping more requests in flight at once.
1472 Implements ticket 9682.
1474 o Major features (relay):
1475 - Raise the minimum acceptable configured bandwidth rate for bridges
1476 to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
1477 20 KiB/sec.) Closes ticket 13822.
1479 o Major bugfixes (exit node stability):
1480 - Fix an assertion failure that could occur under high DNS load.
1481 Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
1482 diagnosed and fixed by "cypherpunks".
1484 o Major bugfixes (mixed relay-client operation):
1485 - When running as a relay and client at the same time (not
1486 recommended), if we decide not to use a new guard because we want
1487 to retry older guards, only close the locally-originating circuits
1488 passing through that guard. Previously we would close all the
1489 circuits through that guard. Fixes bug 9819; bugfix on
1490 0.2.1.1-alpha. Reported by "skruffy".
1492 o Minor features (build):
1493 - New --disable-system-torrc compile-time option to prevent Tor from
1494 looking for the system-wide torrc or torrc-defaults files.
1495 Resolves ticket 13037.
1497 o Minor features (controller):
1498 - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
1499 events so controllers can observe circuit isolation inputs. Closes
1501 - ControlPort now supports the unix:/path/to/socket syntax as an
1502 alternative to the ControlSocket option, for consistency with
1503 SocksPort and HiddenServicePort. Closes ticket 14451.
1504 - New "GETINFO bw-event-cache" to get information about recent
1505 bandwidth events. Closes ticket 14128. Useful for controllers to
1506 get recent bandwidth history after the fix for ticket 13988.
1508 o Minor features (Denial of service resistance):
1509 - Count the total number of bytes used storing hidden service
1510 descriptors against the value of MaxMemInQueues. If we're low on
1511 memory, and more than 20% of our memory is used holding hidden
1512 service descriptors, free them until no more than 10% of our
1513 memory holds hidden service descriptors. Free the least recently
1514 fetched descriptors first. Resolves ticket 13806.
1515 - When we have recently been under memory pressure (over 3/4 of
1516 MaxMemInQueues is allocated), then allocate smaller zlib objects
1517 for small requests. Closes ticket 11791.
1519 o Minor features (geoip):
1520 - Update geoip and geoip6 files to the January 7 2015 Maxmind
1521 GeoLite2 Country database.
1523 o Minor features (guard nodes):
1524 - Reduce the time delay before saving guard status to disk from 10
1525 minutes to 30 seconds (or from one hour to 10 minutes if
1526 AvoidDiskWrites is set). Closes ticket 12485.
1528 o Minor features (hidden service):
1529 - Make Sybil attacks against hidden services harder by changing the
1530 minimum time required to get the HSDir flag from 25 hours up to 96
1531 hours. Addresses ticket 14149.
1532 - New option "HiddenServiceAllowUnknownPorts" to allow hidden
1533 services to disable the anti-scanning feature introduced in
1534 0.2.6.2-alpha. With this option not set, a connection to an
1535 unlisted port closes the circuit. With this option set, only a
1536 RELAY_DONE cell is sent. Closes ticket 14084.
1538 o Minor features (interface):
1539 - Implement "-f -" command-line option to read torrc configuration
1540 from standard input, if you don't want to store the torrc file in
1541 the file system. Implements feature 13865.
1543 o Minor features (logging):
1544 - Add a count of unique clients to the bridge heartbeat message.
1545 Resolves ticket 6852.
1546 - Suppress "router info incompatible with extra info" message when
1547 reading extrainfo documents from cache. (This message got loud
1548 around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
1550 - Elevate hidden service authorized-client message from DEBUG to
1551 INFO. Closes ticket 14015.
1553 o Minor features (stability):
1554 - Add assertions in our hash-table iteration code to check for
1555 corrupted values that could cause infinite loops. Closes
1558 o Minor features (systemd):
1559 - Various improvements and modernizations in systemd hardening
1560 support. Closes ticket 13805. Patch from Craig Andrews.
1562 o Minor features (testing networks):
1563 - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
1564 and the default on a testing network to 2 minutes. Drop the
1565 MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
1566 keep the default on a testing network at 30 seconds. This reduces
1567 HS bootstrap time to around 25 seconds. Also, change the default
1568 time in test-network.sh to match. Closes ticket 13401. Patch
1570 - Create TestingDirAuthVoteHSDir to correspond to
1571 TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
1572 HSDir flag for the listed relays regardless of uptime or ORPort
1573 connectivity. Respects the value of VoteOnHidServDirectoriesV2.
1574 Partial implementation for ticket 14067. Patch by "teor".
1576 o Minor features (tor2web mode):
1577 - Introduce the config option Tor2webRendezvousPoints, which allows
1578 clients in Tor2webMode to select a specific Rendezvous Point to be
1579 used in HS circuits. This might allow better performance for
1580 Tor2Web nodes. Implements ticket 12844.
1582 o Minor bugfixes (client DNS):
1583 - Report the correct cached DNS expiration times on SOCKS port or in
1584 DNS replies. Previously, we would report everything as "never
1585 expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
1586 - Avoid a small memory leak when we find a cached answer for a
1587 reverse DNS lookup in a client-side DNS cache. (Remember, client-
1588 side DNS caching is off by default, and is not recommended.) Fixes
1589 bug 14259; bugfix on 0.2.0.1-alpha.
1591 o Minor bugfixes (client, automapping):
1592 - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
1593 no value follows the option. Fixes bug 14142; bugfix on
1594 0.2.4.7-alpha. Patch by "teor".
1595 - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
1596 14195; bugfix on 0.1.0.1-rc.
1597 - Prevent changes to other options from removing the wildcard value
1598 "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
1600 - Allow MapAddress and AutomapHostsOnResolve to work together when
1601 an address is mapped into another address type (like .onion) that
1602 must be automapped at resolve time. Fixes bug 7555; bugfix
1605 o Minor bugfixes (client, bridges):
1606 - When we are using bridges and we had a network connectivity
1607 problem, only retry connecting to our currently configured
1608 bridges, not all bridges we know about and remember using. Fixes
1609 bug 14216; bugfix on 0.2.2.17-alpha.
1611 o Minor bugfixes (client, IPv6):
1612 - Reject socks requests to literal IPv6 addresses when IPv6Traffic
1613 flag is not set; and not because the NoIPv4Traffic flag was set.
1614 Previously we'd looked at the NoIPv4Traffic flag for both types of
1615 literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
1617 o Minor bugfixes (compilation):
1618 - The address of an array in the middle of a structure will always
1619 be non-NULL. clang recognises this and complains. Disable the
1620 tautologous and redundant check to silence this warning. Fixes bug
1621 14001; bugfix on 0.2.1.2-alpha.
1622 - Avoid warnings when building with systemd 209 or later. Fixes bug
1623 14072; bugfix on 0.2.6.2-alpha. Patch from "h.venev".
1624 - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
1625 Addresses ticket 14188.
1626 - Build without warnings with the stock OpenSSL srtp.h header, which
1627 has a duplicate declaration of SSL_get_selected_srtp_profile().
1628 Fixes bug 14220; this is OpenSSL's bug, not ours.
1629 - Do not compile any code related to Tor2Web mode when Tor2Web mode
1630 is not enabled at compile time. Previously, this code was included
1631 in a disabled state. See discussion on ticket 12844.
1632 - Remove the --disable-threads configure option again. It was
1633 accidentally partially reintroduced in 29ac883606d6d. Fixes bug
1634 14819; bugfix on 0.2.6.2-alpha.
1636 o Minor bugfixes (controller):
1637 - Report "down" in response to the "GETINFO entry-guards" command
1638 when relays are down with an unreachable_since value. Previously,
1639 we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
1640 - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
1641 14116; bugfix on 0.2.2.9-alpha.
1642 - Add a code for the END_CIRC_REASON_IP_NOW_REDUNDANT circuit close
1643 reason. Fixes bug 14207; bugfix on 0.2.6.2-alpha.
1645 o Minor bugfixes (directory authority):
1646 - Allow directory authorities to fetch more data from one another if
1647 they find themselves missing lots of votes. Previously, they had
1648 been bumping against the 10 MB queued data limit. Fixes bug 14261;
1649 bugfix on 0.1.2.5-alpha.
1650 - Do not attempt to download extrainfo documents which we will be
1651 unable to validate with a matching server descriptor. Fixes bug
1652 13762; bugfix on 0.2.0.1-alpha.
1653 - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
1654 control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
1655 - Enlarge the buffer to read bwauth generated files to avoid an
1656 issue when parsing the file in dirserv_read_measured_bandwidths().
1657 Fixes bug 14125; bugfix on 0.2.2.1-alpha.
1659 o Minor bugfixes (file handling):
1660 - Stop failing when key files are zero-length. Instead, generate new
1661 keys, and overwrite the empty key files. Fixes bug 13111; bugfix
1662 on all versions of Tor. Patch by "teor".
1663 - Stop generating a fresh .old RSA onion key file when the .old file
1664 is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
1665 - Avoid overwriting .old key files with empty key files.
1666 - Skip loading zero-length extrainfo store, router store, stats,
1667 state, and key files.
1668 - Avoid crashing when trying to reload a torrc specified as a
1669 relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
1672 o Minor bugfixes (hidden services):
1673 - Close the introduction circuit when we have no more usable intro
1674 points, instead of waiting for it to time out. This also ensures
1675 that no follow-up HS descriptor fetch is triggered when the
1676 circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
1677 - When fetching a hidden service descriptor for a down service that
1678 was recently up, do not keep refetching until we try the same
1679 replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
1680 - Successfully launch Tor with a nonexistent hidden service
1681 directory. Our fix for bug 13942 didn't catch this case. Fixes bug
1682 14106; bugfix on 0.2.6.2-alpha.
1684 o Minor bugfixes (logging):
1685 - Avoid crashing when there are more log domains than entries in
1686 domain_list. Bugfix on 0.2.3.1-alpha.
1687 - Add a string representation for LD_SCHED. Fixes bug 14740; bugfix
1689 - Don't log messages to stdout twice when starting up. Fixes bug
1690 13993; bugfix on 0.2.6.1-alpha.
1692 o Minor bugfixes (parsing):
1693 - Stop accepting milliseconds (or other junk) at the end of
1694 descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
1695 - Support two-number and three-number version numbers correctly, in
1696 case we change the Tor versioning system in the future. Fixes bug
1697 13661; bugfix on 0.0.8pre1.
1699 o Minor bugfixes (path counting):
1700 - When deciding whether the consensus lists any exit nodes, count
1701 the number listed in the consensus, not the number we have
1702 descriptors for. Fixes part of bug 14918; bugfix on 0.2.6.2-alpha.
1703 - When deciding whether we have any exit nodes, only examine
1704 ExitNodes when the ExitNodes option is actually set. Fixes part of
1705 bug 14918; bugfix on 0.2.6.2-alpha.
1706 - Get rid of redundant and possibly scary warnings that we are
1707 missing directory information while we bootstrap. Fixes part of
1708 bug 14918; bugfix on 0.2.6.2-alpha.
1710 o Minor bugfixes (portability):
1711 - Fix the ioctl()-based network interface lookup code so that it
1712 will work on systems that have variable-length struct ifreq, for
1714 - Fix scheduler compilation on targets where char is unsigned. Fixes
1715 bug 14764; bugfix on 0.2.6.2-alpha. Reported by Christian Kujau.
1717 o Minor bugfixes (sandbox):
1718 - Allow glibc fatal errors to be sent to stderr before Tor exits.
1719 Previously, glibc would try to write them to /dev/tty, and the
1720 sandbox would trap the call and make Tor exit prematurely. Fixes
1721 bug 14759; bugfix on 0.2.5.1-alpha.
1723 o Minor bugfixes (shutdown):
1724 - When shutting down, always call event_del() on lingering read or
1725 write events before freeing them. Otherwise, we risk double-frees
1726 or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
1729 o Minor bugfixes (small memory leaks):
1730 - Avoid leaking memory when using IPv6 virtual address mappings.
1731 Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
1734 o Minor bugfixes (statistics):
1735 - Increase period over which bandwidth observations are aggregated
1736 from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
1738 o Minor bugfixes (systemd support):
1739 - Fix detection and operation of systemd watchdog. Fixes part of bug
1740 14141; bugfix on 0.2.6.2-alpha. Patch from Tomasz Torcz.
1741 - Run correctly under systemd with the RunAsDaemon option set. Fixes
1742 part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
1743 - Inform the systemd supervisor about more changes in the Tor
1744 process status. Implements part of ticket 14141. Patch from
1746 - Cause the "--disable-systemd" option to actually disable systemd
1747 support. Fixes bug 14350; bugfix on 0.2.6.2-alpha. Patch
1750 o Minor bugfixes (TLS):
1751 - Check more thoroughly throughout the TLS code for possible
1752 unlogged TLS errors. Possible diagnostic or fix for bug 13319.
1754 o Minor bugfixes (transparent proxy):
1755 - Use getsockname, not getsockopt, to retrieve the address for a
1756 TPROXY-redirected connection. Fixes bug 13796; bugfix
1759 o Code simplification and refactoring:
1760 - Move fields related to isolating and configuring client ports into
1761 a shared structure. Previously, they were duplicated across
1762 port_cfg_t, listener_connection_t, and edge_connection_t. Failure
1763 to copy them correctly had been the cause of at least one bug in
1764 the past. Closes ticket 8546.
1765 - Refactor the get_interface_addresses_raw() doom-function into
1766 multiple smaller and simpler subfunctions. Cover the resulting
1767 subfunctions with unit-tests. Fixes a significant portion of
1769 - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
1770 only for version <= 0.2.2.24 which is now deprecated. Closes
1772 - Remove a test for a long-defunct broken version-one
1776 - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
1777 for writing the OpenBSD-specific tips. Resolves ticket 13702.
1778 - Make the tor-resolve documentation match its help string and its
1779 options. Resolves part of ticket 14325.
1780 - Log a more useful error message from tor-resolve when failing to
1781 look up a hidden service address. Resolves part of ticket 14325.
1783 o Downgraded warnings:
1784 - Don't warn when we've attempted to contact a relay using the wrong
1785 ntor onion key. Closes ticket 9635.
1788 - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
1789 longer silently accepted as an alias for "ExitNodes".
1790 - The --enable-mempool and --enable-buf-freelists options, which
1791 were originally created to work around bad malloc implementations,
1792 no longer exist. They were off-by-default in 0.2.5. Closes
1796 - Make the checkdir/perms test complete successfully even if the
1797 global umask is not 022. Fixes bug 14215; bugfix on 0.2.6.2-alpha.
1798 - Test that tor does not fail when key files are zero-length. Check
1799 that tor generates new keys, and overwrites the empty key files.
1800 - Test that tor generates new keys when keys are missing
1801 (existing behavior).
1802 - Test that tor does not overwrite key files that already contain
1803 data (existing behavior). Tests bug 13111. Patch by "teor".
1804 - New "make test-stem" target to run stem integration tests.
1805 Requires that the "STEM_SOURCE_DIR" environment variable be set.
1806 Closes ticket 14107.
1807 - Make the test_cmdline_args.py script work correctly on Windows.
1808 Patch from Gisle Vanem.
1809 - Move the slower unit tests into a new "./src/test/test-slow"
1810 binary that can be run independently of the other tests. Closes
1812 - Avoid undefined behavior when sampling huge values from the
1813 Laplace distribution. This made unittests fail on Raspberry Pi.
1814 Bug found by Device. Fixes bug 14090; bugfix on 0.2.6.2-alpha.
1817 Changes in version 0.2.6.2-alpha - 2014-12-31
1818 Tor 0.2.6.2-alpha is the second alpha release in the 0.2.6.x series.
1819 It introduces a major new backend for deciding when to send cells on
1820 channels, which should lead down the road to big performance
1821 increases. It contains security and statistics features for better
1822 work on hidden services, and numerous bugfixes.
1824 This release contains many new unit tests, along with major
1825 performance improvements for running testing networks using Chutney.
1826 Thanks to a series of patches contributed by "teor", testing networks
1827 should now bootstrap in seconds, rather than minutes.
1829 o Major features (relay, infrastructure):
1830 - Complete revision of the code that relays use to decide which cell
1831 to send next. Formerly, we selected the best circuit to write on
1832 each channel, but we didn't select among channels in any
1833 sophisticated way. Now, we choose the best circuits globally from
1834 among those whose channels are ready to deliver traffic.
1836 This patch implements a new inter-cmux comparison API, a global
1837 high/low watermark mechanism and a global scheduler loop for
1838 transmission prioritization across all channels as well as among
1839 circuits on one channel. This schedule is currently tuned to
1840 (tolerantly) avoid making changes in network performance, but it
1841 should form the basis for major circuit performance increases in
1842 the future. Code by Andrea; tuning by Rob Jansen; implements
1845 o Major features (hidden services):
1846 - Make HS port scanning more difficult by immediately closing the
1847 circuit when a user attempts to connect to a nonexistent port.
1848 Closes ticket 13667.
1849 - Add a HiddenServiceStatistics option that allows Tor relays to
1850 gather and publish statistics about the overall size and volume of
1851 hidden service usage. Specifically, when this option is turned on,
1852 an HSDir will publish an approximate number of hidden services
1853 that have published descriptors to it the past 24 hours. Also, if
1854 a relay has acted as a hidden service rendezvous point, it will
1855 publish the approximate amount of rendezvous cells it has relayed
1856 the past 24 hours. The statistics themselves are obfuscated so
1857 that the exact values cannot be derived. For more details see
1858 proposal 238, "Better hidden service stats from Tor relays". This
1859 feature is currently disabled by default. Implements feature 13192.
1861 o Major bugfixes (client, automap):
1862 - Repair automapping with IPv6 addresses. This automapping should
1863 have worked previously, but one piece of debugging code that we
1864 inserted to detect a regression actually caused the regression to
1865 manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
1866 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
1869 o Major bugfixes (hidden services):
1870 - When closing an introduction circuit that was opened in parallel
1871 with others, don't mark the introduction point as unreachable.
1872 Previously, the first successful connection to an introduction
1873 point would make the other introduction points get marked as
1874 having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
1876 o Directory authority changes:
1877 - Remove turtles as a directory authority.
1878 - Add longclaw as a new (v3) directory authority. This implements
1879 ticket 13296. This keeps the directory authority count at 9.
1881 o Major removed features:
1882 - Tor clients no longer support connecting to hidden services
1883 running on Tor 0.2.2.x and earlier; the Support022HiddenServices
1884 option has been removed. (There shouldn't be any hidden services
1885 running these versions on the network.) Closes ticket 7803.
1887 o Minor features (client):
1888 - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
1889 is enabled, reject requests with IP addresses as hostnames.
1890 Resolves ticket 13315.
1892 o Minor features (controller):
1893 - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
1894 write an unscheduled heartbeat message to the log. Implements
1897 o Minor features (geoip):
1898 - Update geoip and geoip6 to the November 15 2014 Maxmind GeoLite2
1901 o Minor features (hidden services):
1902 - When re-enabling the network, don't try to build introduction
1903 circuits until we have successfully built a circuit. This makes
1904 hidden services come up faster when the network is re-enabled.
1905 Patch from "akwizgran". Closes ticket 13447.
1906 - When we fail to retrieve a hidden service descriptor, send the
1907 controller an "HS_DESC FAILED" controller event. Implements
1909 - New HiddenServiceDirGroupReadable option to cause hidden service
1910 directories and hostname files to be created group-readable. Patch
1911 from "anon", David Stainton, and "meejah". Closes ticket 11291.
1913 o Minor features (systemd):
1914 - Where supported, when running with systemd, report successful
1915 startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
1916 - When running with systemd, support systemd watchdog messages. Part
1917 of ticket 11016. Patch by Michael Scherer.
1919 o Minor features (transparent proxy):
1920 - Update the transparent proxy option checks to allow for both ipfw
1921 and pf on OS X. Closes ticket 14002.
1922 - Use the correct option when using IPv6 with transparent proxy
1923 support on Linux. Resolves 13808. Patch by Francisco Blas
1926 o Minor bugfixes (preventative security, C safety):
1927 - When reading a hexadecimal, base-32, or base-64 encoded value from
1928 a string, always overwrite the whole output buffer. This prevents
1929 some bugs where we would look at (but fortunately, not reveal)
1930 uninitialized memory on the stack. Fixes bug 14013; bugfix on all
1932 - Clear all memory targetted by tor_addr_{to,from}_sockaddr(), not
1933 just the part that's used. This makes it harder for data leak bugs
1934 to occur in the event of other programming failures. Resolves
1937 o Minor bugfixes (client, microdescriptors):
1938 - Use a full 256 bits of the SHA256 digest of a microdescriptor when
1939 computing which microdescriptors to download. This keeps us from
1940 erroneous download behavior if two microdescriptor digests ever
1941 have the same first 160 bits. Fixes part of bug 13399; bugfix
1943 - Reset a router's status if its microdescriptor digest changes,
1944 even if the first 160 bits remain the same. Fixes part of bug
1945 13399; bugfix on 0.2.3.1-alpha.
1947 o Minor bugfixes (compilation):
1948 - Silence clang warnings under --enable-expensive-hardening,
1949 including implicit truncation of 64 bit values to 32 bit, const
1950 char assignment to self, tautological compare, and additional
1951 parentheses around equality tests. Fixes bug 13577; bugfix
1953 - Fix a clang warning about checking whether an address in the
1954 middle of a structure is NULL. Fixes bug 14001; bugfix
1957 o Minor bugfixes (hidden services):
1958 - Correctly send a controller event when we find that a rendezvous
1959 circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
1960 - Pre-check directory permissions for new hidden-services to avoid
1961 at least one case of "Bug: Acting on config options left us in a
1962 broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
1963 - When adding a new hidden service (for example, via SETCONF), Tor
1964 no longer congratulates the user for running a relay. Fixes bug
1965 13941; bugfix on 0.2.6.1-alpha.
1966 - When fetching hidden service descriptors, we now check not only
1967 for whether we got the hidden service we had in mind, but also
1968 whether we got the particular descriptors we wanted. This prevents
1969 a class of inefficient but annoying DoS attacks by hidden service
1970 directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
1973 o Minor bugfixes (Linux seccomp2 sandbox):
1974 - Make transparent proxy support work along with the seccomp2
1975 sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
1976 by Francisco Blas Izquierdo Riera.
1977 - Fix a memory leak in tor-resolve when running with the sandbox
1978 enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
1980 o Minor bugfixes (logging):
1981 - Downgrade warnings about RSA signature failures to info log level.
1982 Emit a warning when an extra info document is found incompatible
1983 with a corresponding router descriptor. Fixes bug 9812; bugfix
1985 - Make connection_ap_handshake_attach_circuit() log the circuit ID
1986 correctly. Fixes bug 13701; bugfix on 0.0.6.
1988 o Minor bugfixes (misc):
1989 - Stop allowing invalid address patterns like "*/24" that contain
1990 both a wildcard address and a bit prefix length. This affects all
1991 our address-range parsing code. Fixes bug 7484; bugfix
1994 o Minor bugfixes (testing networks, fast startup):
1995 - Allow Tor to build circuits using a consensus with no exits. If
1996 the consensus has no exits (typical of a bootstrapping test
1997 network), allow Tor to build circuits once enough descriptors have
1998 been downloaded. This assists in bootstrapping a testing Tor
1999 network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
2001 - When V3AuthVotingInterval is low, give a lower If-Modified-Since
2002 header to directory servers. This allows us to obtain consensuses
2003 promptly when the consensus interval is very short. This assists
2004 in bootstrapping a testing Tor network. Fixes parts of bugs 13718
2005 and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
2006 - Stop assuming that private addresses are local when checking
2007 reachability in a TestingTorNetwork. Instead, when testing, assume
2008 all OR connections are remote. (This is necessary due to many test
2009 scenarios running all relays on localhost.) This assists in
2010 bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
2011 0.1.0.1-rc. Patch by "teor".
2012 - Avoid building exit circuits from a consensus with no exits. Now
2013 thanks to our fix for 13718, we accept a no-exit network as not
2014 wholly lost, but we need to remember not to try to build exit
2015 circuits on it. Closes ticket 13814; patch by "teor".
2016 - Stop requiring exits to have non-zero bandwithcapacity in a
2017 TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
2018 ignore exit bandwidthcapacity. This assists in bootstrapping a
2019 testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
2020 on 0.2.0.3-alpha. Patch by "teor".
2021 - Add "internal" to some bootstrap statuses when no exits are
2022 available. If the consensus does not contain Exits, Tor will only
2023 build internal circuits. In this case, relevant statuses will
2024 contain the word "internal" as indicated in the Tor control-
2025 spec.txt. When bootstrap completes, Tor will be ready to build
2026 internal circuits. If a future consensus contains Exits, exit
2027 circuits may become available. Fixes part of bug 13718; bugfix on
2028 0.2.4.10-alpha. Patch by "teor".
2029 - Decrease minimum consensus interval to 10 seconds when
2030 TestingTorNetwork is set, or 5 seconds for the first consensus.
2031 Fix assumptions throughout the code that assume larger intervals.
2032 Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
2034 - Avoid excluding guards from path building in minimal test
2035 networks, when we're in a test network and excluding guards would
2036 exclude all relays. This typically occurs in incredibly small tor
2037 networks, and those using "TestingAuthVoteGuard *". Fixes part of
2038 bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
2040 o Code simplification and refactoring:
2041 - Stop using can_complete_circuits as a global variable; access it
2042 with a function instead.
2043 - Avoid using operators directly as macro arguments: this lets us
2044 apply coccinelle transformations to our codebase more directly.
2045 Closes ticket 13172.
2046 - Combine the functions used to parse ClientTransportPlugin and
2047 ServerTransportPlugin into a single function. Closes ticket 6456.
2048 - Add inline functions and convenience macros for inspecting channel
2049 state. Refactor the code to use convenience macros instead of
2050 checking channel state directly. Fixes issue 7356.
2051 - Document all members of was_router_added_t and rename
2052 ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
2053 confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
2054 - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
2055 constant instead of hardcoded value. Fixes issue 13840.
2056 - Refactor our generic strmap and digestmap types into a single
2057 implementation, so that we can add a new digest256map
2061 - Document the bridge-authority-only 'networkstatus-bridges' file.
2062 Closes ticket 13713; patch from "tom".
2063 - Fix typo in PredictedPortsRelevanceTime option description in
2064 manpage. Resolves issue 13707.
2065 - Stop suggesting that users specify relays by nickname: it isn't a
2066 good idea. Also, properly cross-reference how to specify relays in
2067 all parts of manual documenting options that take a list of
2068 relays. Closes ticket 13381.
2069 - Clarify the HiddenServiceDir option description in manpage to make
2070 it clear that relative paths are taken with respect to the current
2071 working directory. Also clarify that this behavior is not
2072 guaranteed to remain indefinitely. Fixes issue 13913.
2075 - New tests for many parts of channel, relay, and circuitmux
2076 functionality. Code by Andrea; part of 9262.
2077 - New tests for parse_transport_line(). Part of ticket 6456.
2078 - In the unit tests, use chgrp() to change the group of the unit
2079 test temporary directory to the current user, so that the sticky
2080 bit doesn't interfere with tests that check directory groups.
2082 - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
2086 Changes in version 0.2.6.1-alpha - 2014-10-30
2087 Tor 0.2.6.1-alpha is the first release in the Tor 0.2.6.x series. It
2088 includes numerous code cleanups and new tests, and fixes a large
2089 number of annoying bugs. Out-of-memory conditions are handled better
2090 than in 0.2.5, pluggable transports have improved proxy support, and
2091 clients now use optimistic data for contacting hidden services. Also,
2092 we are now more robust to changes in what we consider a parseable
2093 directory object, so that tightening restrictions does not have a risk
2094 of introducing infinite download loops.
2096 This is the first alpha release in a new series, so expect there to be
2097 bugs. Users who would rather test out a more stable branch should stay
2098 with 0.2.5.x for now.
2100 o New compiler and system requirements:
2101 - Tor 0.2.6.x requires that your compiler support more of the C99
2102 language standard than before. The 'configure' script now detects
2103 whether your compiler supports C99 mid-block declarations and
2104 designated initializers. If it does not, Tor will not compile.
2106 We may revisit this requirement if it turns out that a significant
2107 number of people need to build Tor with compilers that don't
2108 bother implementing a 15-year-old standard. Closes ticket 13233.
2109 - Tor no longer supports systems without threading support. When we
2110 began working on Tor, there were several systems that didn't have
2111 threads, or where the thread support wasn't able to run the
2112 threads of a single process on multiple CPUs. That no longer
2113 holds: every system where Tor needs to run well now has threading
2114 support. Resolves ticket 12439.
2116 o Removed platform support:
2117 - We no longer include special code to build on Windows CE; as far
2118 as we know, nobody has used Tor on Windows CE in a very long time.
2119 Closes ticket 11446.
2121 o Major features (bridges):
2122 - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
2123 transports if they are configured via the "TOR_PT_PROXY"
2124 environment variable. Implements proposal 232. Resolves
2127 o Major features (client performance, hidden services):
2128 - Allow clients to use optimistic data when connecting to a hidden
2129 service, which should remove a round-trip from hidden service
2130 initialization. See proposal 181 for details. Implements
2133 o Major features (directory system):
2134 - Upon receiving an unparseable directory object, if its digest
2135 matches what we expected, then don't try to download it again.
2136 Previously, when we got a descriptor we didn't like, we would keep
2137 trying to download it over and over. Closes ticket 11243.
2139 o Major features (sample torrc):
2140 - Add a new, infrequently-changed "torrc.minimal". This file is
2141 similar to torrc.sample, but it will change as infrequently as
2142 possible, for the benefit of users whose systems prompt them for
2143 intervention whenever a default configuration file is changed.
2144 Making this change allows us to update torrc.sample to be a more
2145 generally useful "sample torrc".
2147 o Major bugfixes (directory authorities):
2148 - Do not assign the HSDir flag to relays if they are not Valid, or
2149 currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
2151 o Major bugfixes (directory bandwidth performance):
2152 - Don't flush the zlib buffer aggressively when compressing
2153 directory information for clients. This should save about 7% of
2154 the bandwidth currently used for compressed descriptors and
2155 microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
2157 o Minor features (security, memory wiping):
2158 - Ensure we securely wipe keys from memory after
2159 crypto_digest_get_digest and init_curve25519_keypair_from_file
2160 have finished using them. Resolves ticket 13477.
2162 o Minor features (security, out-of-memory handling):
2163 - When handling an out-of-memory condition, allocate less memory for
2164 temporary data structures. Fixes issue 10115.
2165 - When handling an out-of-memory condition, consider more types of
2166 buffers, including those on directory connections, and zlib
2167 buffers. Resolves ticket 11792.
2170 - When identity keypair is generated for first time, log a
2171 congratulatory message that links to the new relay lifecycle
2172 document. Implements feature 10427.
2174 o Minor features (client):
2175 - Clients are now willing to send optimistic data (before they
2176 receive a 'connected' cell) to relays of any version. (Relays
2177 without support for optimistic data are no longer supported on the
2178 Tor network.) Resolves ticket 13153.
2180 o Minor features (directory authorities):
2181 - Don't list relays with a bandwidth estimate of 0 in the consensus.
2182 Implements a feature proposed during discussion of bug 13000.
2183 - In tor-gencert, report an error if the user provides the same
2184 argument more than once.
2185 - If a directory authority can't find a best consensus method in the
2186 votes that it holds, it now falls back to its favorite consensus
2187 method. Previously, it fell back to method 1. Neither of these is
2188 likely to get enough signatures, but "fall back to favorite"
2189 doesn't require us to maintain support an obsolete consensus
2190 method. Implements part of proposal 215.
2192 o Minor features (logging):
2193 - On Unix-like systems, you can now use named pipes as the target of
2194 the Log option, and other options that try to append to files.
2195 Closes ticket 12061. Patch from "carlo von lynX".
2196 - When opening a log file at startup, send it every log message that
2197 we generated between startup and opening it. Previously, log
2198 messages that were generated before opening the log file were only
2199 logged to stdout. Closes ticket 6938.
2200 - Add a TruncateLogFile option to overwrite logs instead of
2201 appending to them. Closes ticket 5583.
2203 o Minor features (portability, Solaris):
2204 - Threads are no longer disabled by default on Solaris; we believe
2205 that the versions of Solaris with broken threading support are all
2206 obsolete by now. Resolves ticket 9495.
2208 o Minor features (relay):
2209 - Re-check our address after we detect a changed IP address from
2210 getsockname(). This ensures that the controller command "GETINFO
2211 address" will report the correct value. Resolves ticket 11582.
2213 - A new AccountingRule option lets Relays set whether they'd like
2214 AccountingMax to be applied separately to inbound and outbound
2215 traffic, or applied to the sum of inbound and outbound traffic.
2216 Resolves ticket 961. Patch by "chobe".
2218 o Minor features (testing networks):
2219 - Add the TestingDirAuthVoteExit option, which lists nodes to assign
2220 the "Exit" flag regardless of their uptime, bandwidth, or exit
2221 policy. TestingTorNetwork must be set for this option to have any
2222 effect. Previously, authorities would take up to 35 minutes to
2223 give nodes the Exit flag in a test network. Partially implements
2226 o Minor features (validation):
2227 - Check all date/time values passed to tor_timegm and
2228 parse_rfc1123_time for validity, taking leap years into account.
2229 Improves HTTP header validation. Implemented with bug 13476.
2230 - In correct_tm(), limit the range of values returned by system
2231 localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
2232 This means we don't have to deal with negative or too large dates,
2233 even if a clock is wrong. Otherwise we might fail to read a file
2234 written by us which includes such a date. Fixes bug 13476.
2236 o Minor bugfixes (bridge clients):
2237 - When configured to use a bridge without an identity digest (not
2238 recommended), avoid launching an extra channel to it when
2239 bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
2241 o Minor bugfixes (bridges):
2242 - When DisableNetwork is set, do not launch pluggable transport
2243 plugins, and if any are running, terminate them. Fixes bug 13213;
2244 bugfix on 0.2.3.6-alpha.
2246 o Minor bugfixes (C correctness):
2247 - Fix several instances of possible integer overflow/underflow/NaN.
2248 Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
2250 - In circuit_build_times_calculate_timeout() in circuitstats.c,
2251 avoid dividing by zero in the pareto calculations. This traps
2252 under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
2254 - Fix an integer overflow in format_time_interval(). Fixes bug
2255 13393; bugfix on 0.2.0.10-alpha.
2256 - Set the correct day of year value when the system's localtime(_r)
2257 or gmtime(_r) functions fail to set struct tm. Not externally
2258 visible. Fixes bug 13476; bugfix on 0.0.2pre14.
2259 - Avoid unlikely signed integer overflow in tor_timegm on systems
2260 with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
2262 o Minor bugfixes (client):
2263 - Fix smartlist_choose_node_by_bandwidth() so that relays with the
2264 BadExit flag are not considered worthy candidates. Fixes bug
2265 13066; bugfix on 0.1.2.3-alpha.
2266 - Use the consensus schedule for downloading consensuses, and not
2267 the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
2268 - Handle unsupported or malformed SOCKS5 requests properly by
2269 responding with the appropriate error message before closing the
2270 connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
2272 o Minor bugfixes (client, torrc):
2273 - Stop modifying the value of our DirReqStatistics torrc option just
2274 because we're not a bridge or relay. This bug was causing Tor
2275 Browser users to write "DirReqStatistics 0" in their torrc files
2276 as if they had chosen to change the config. Fixes bug 4244; bugfix
2278 - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
2279 that our options have changed every time we SIGHUP. Fixes bug
2280 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
2282 o Minor bugfixes (controller):
2283 - Return an error when the second or later arguments of the
2284 "setevents" controller command are invalid events. Previously we
2285 would return success while silently skipping invalid events. Fixes
2286 bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
2288 o Minor bugfixes (directory system):
2289 - Always believe that v3 directory authorities serve extra-info
2290 documents, whether they advertise "caches-extra-info" or not.
2291 Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
2292 - When running as a v3 directory authority, advertise that you serve
2293 extra-info documents so that clients who want them can find them
2294 from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
2295 - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
2296 Previously, directories offering BRIDGE_DIRINFO and some other
2297 flag (i.e. microdescriptors or extrainfo) would be ignored when
2298 looking for bridges. Partially fixes bug 13163; bugfix
2301 o Minor bugfixes (networking):
2302 - Check for orconns and use connection_or_close_for_error() rather
2303 than connection_mark_for_close() directly in the getsockopt()
2304 failure case of connection_handle_write_impl(). Fixes bug 11302;
2305 bugfix on 0.2.4.4-alpha.
2307 o Minor bugfixes (relay):
2308 - When generating our family list, remove spaces from around the
2309 entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
2310 - If our previous bandwidth estimate was 0 bytes, allow publishing a
2311 new relay descriptor immediately. Fixes bug 13000; bugfix
2314 o Minor bugfixes (testing networks):
2315 - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
2316 testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
2317 - Stop using the default authorities in networks which provide both
2318 AlternateDirAuthority and AlternateBridgeAuthority. Partially
2319 fixes bug 13163; bugfix on 0.2.0.13-alpha.
2321 o Minor bugfixes (testing):
2322 - Stop spawn test failures due to a race condition between the
2323 SIGCHLD handler updating the process status, and the test reading
2324 it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
2326 o Minor bugfixes (testing, Windows):
2327 - Avoid passing an extra backslash when creating a temporary
2328 directory for running the unit tests on Windows. Fixes bug 12392;
2329 bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
2331 o Minor bugfixes (windows):
2332 - Remove code to special-case handling of NTE_BAD_KEYSET when
2333 acquiring windows CryptoAPI context. This error can't actually
2334 occur for the parameters we're providing. Fixes bug 10816; bugfix
2337 o Minor bugfixes (zlib):
2338 - Avoid truncating a zlib stream when trying to finalize it with an
2339 empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
2342 - Allow our configure script to build correctly with autoconf 2.62
2343 again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
2344 - Improve the error message from ./configure to make it clear that
2345 when asciidoc has not been found, the user will have to either add
2346 --disable-asciidoc argument or install asciidoc. Resolves
2349 o Code simplification and refactoring:
2350 - Change the entry_is_live() function to take named bitfield
2351 elements instead of an unnamed list of booleans. Closes
2353 - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
2354 Resolves ticket 12205.
2355 - Use calloc and reallocarray functions instead of multiply-
2356 then-malloc. This makes it less likely for us to fall victim to an
2357 integer overflow attack when allocating. Resolves ticket 12855.
2358 - Use the standard macro name SIZE_MAX, instead of our
2360 - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
2361 functions which take them as arguments. Replace 0 with NO_DIRINFO
2362 in a function call for clarity. Seeks to prevent future issues
2364 - Avoid 4 null pointer errors under clang static analysis by using
2365 tor_assert() to prove that the pointers aren't null. Fixes
2367 - Rework the API of policies_parse_exit_policy() to use a bitmask to
2368 represent parsing options, instead of a confusing mess of
2369 booleans. Resolves ticket 8197.
2370 - Introduce a helper function to parse ExitPolicy in
2371 or_options_t structure.
2374 - Add a doc/TUNING document with tips for handling large numbers of
2375 TCP connections when running busy Tor relay. Update the warning
2376 message to point to this file when running out of sockets
2377 operating system is allowing to use simultaneously. Resolves
2381 - We no longer remind the user about configuration options that have
2382 been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
2383 - Remove our old, non-weighted bandwidth-based node selection code.
2384 Previously, we used it as a fallback when we couldn't perform
2385 weighted bandwidth-based node selection. But that would only
2386 happen in the cases where we had no consensus, or when we had a
2387 consensus generated by buggy or ancient directory authorities. In
2388 either case, it's better to use the more modern, better maintained
2389 algorithm, with reasonable defaults for the weights. Closes
2391 - Remove the --disable-curve25519 configure option. Relays and
2392 clients now are required to support curve25519 and the
2394 - The old "StrictEntryNodes" and "StrictExitNodes" options, which
2395 used to be deprecated synonyms for "StrictNodes", are now marked
2396 obsolete. Resolves ticket 12226.
2397 - Clients don't understand the BadDirectory flag in the consensus
2398 anymore, and ignore it.
2401 - Refactor the function that chooses guard nodes so that it can more
2402 easily be tested; write some tests for it.
2403 - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
2404 bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
2405 - Create unit tests for format_time_interval(). With bug 13393.
2406 - Add unit tests for tor_timegm signed overflow, tor_timegm and
2407 parse_rfc1123_time validity checks, correct_tm year clamping. Unit
2408 tests (visible) fixes in bug 13476.
2409 - Add a "coverage-html" make target to generate HTML-visualized
2410 coverage results when building with --enable-coverage. (Requires
2411 lcov.) Patch from Kevin Murray.
2412 - Enable the backtrace handler (where supported) when running the
2414 - Revise all unit tests that used the legacy test_* macros to
2415 instead use the recommended tt_* macros. This patch was generated
2416 with coccinelle, to avoid manual errors. Closes ticket 13119.
2418 o Distribution (systemd):
2419 - systemd unit file: only allow tor to write to /var/lib/tor and
2420 /var/log/tor. The rest of the filesystem is accessible for reading
2421 only. Patch by intrigeri; resolves ticket 12751.
2422 - systemd unit file: ensure that the process and all its children
2423 can never gain new privileges. Patch by intrigeri; resolves
2425 - systemd unit file: set up /var/run/tor as writable for the Tor
2426 service. Patch by intrigeri; resolves ticket 13196.
2428 o Removed features (directory authorities):
2429 - Remove code that prevented authorities from listing Tor relays
2430 affected by CVE-2011-2769 as guards. These relays are already
2431 rejected altogether due to the minimum version requirement of
2432 0.2.3.16-alpha. Closes ticket 13152.
2433 - The "AuthDirRejectUnlisted" option no longer has any effect, as
2434 the fingerprints file (approved-routers) has been deprecated.
2435 - Directory authorities do not support being Naming dirauths anymore.
2436 The "NamingAuthoritativeDir" config option is now obsolete.
2437 - Directory authorities do not support giving out the BadDirectory
2439 - Directory authorities no longer advertise or support consensus
2440 methods 1 through 12 inclusive. These consensus methods were
2441 obsolete and/or insecure: maintaining the ability to support them
2442 served no good purpose. Implements part of proposal 215; closes
2445 o Testing (test-network.sh):
2446 - Stop using "echo -n", as some shells' built-in echo doesn't
2447 support "-n". Instead, use "/bin/echo -n". Partially fixes
2449 - Stop an apparent test-network hang when used with make -j2. Fixes
2451 - Add a --delay option to test-network.sh, which configures the
2452 delay before the chutney network tests for data transmission.
2453 Partially implements ticket 13161.
2456 Changes in version 0.2.5.10 - 2014-10-24
2457 Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
2459 It adds several new security features, including improved
2460 denial-of-service resistance for relays, new compiler hardening
2461 options, and a system-call sandbox for hardened installations on Linux
2462 (requires seccomp2). The controller protocol has several new features,
2463 resolving IPv6 addresses should work better than before, and relays
2464 should be a little more CPU-efficient. We've added support for more
2465 OpenBSD and FreeBSD transparent proxy types. We've improved the build
2466 system and testing infrastructure to allow unit testing of more parts
2467 of the Tor codebase. Finally, we've addressed several nagging pluggable
2468 transport usability issues, and included numerous other small bugfixes
2469 and features mentioned below.
2471 This release marks end-of-life for Tor 0.2.3.x; those Tor versions
2472 have accumulated many known flaws; everyone should upgrade.
2474 o Deprecated versions:
2475 - Tor 0.2.3.x has reached end-of-life; it has received no patches or
2476 attention for some while.
2479 Changes in version 0.2.5.9-rc - 2014-10-20
2480 Tor 0.2.5.9-rc is the third release candidate for the Tor 0.2.5.x
2481 series. It disables SSL3 in response to the recent "POODLE" attack
2482 (even though POODLE does not affect Tor). It also works around a crash
2483 bug caused by some operating systems' response to the "POODLE" attack
2484 (which does affect Tor). It also contains a few miscellaneous fixes.
2486 o Major security fixes:
2487 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
2488 today support TLS 1.0 or later, so we can safely turn off support
2489 for this old (and insecure) protocol. Fixes bug 13426.
2491 o Major bugfixes (openssl bug workaround):
2492 - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
2493 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
2494 13471. This is a workaround for an OpenSSL bug.
2497 - Disable the sandbox name resolver cache when running tor-resolve:
2498 tor-resolve doesn't use the sandbox code, and turning it on was
2499 breaking attempts to do tor-resolve on a non-default server on
2500 Linux. Fixes bug 13295; bugfix on 0.2.5.3-alpha.
2502 o Compilation fixes:
2503 - Build and run correctly on systems like OpenBSD-current that have
2504 patched OpenSSL to remove get_cipher_by_char and/or its
2505 implementations. Fixes issue 13325.
2507 o Downgraded warnings:
2508 - Downgrade the severity of the 'unexpected sendme cell from client'
2509 from 'warn' to 'protocol warning'. Closes ticket 8093.
2512 Changes in version 0.2.4.25 - 2014-10-20
2513 Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
2514 (even though POODLE does not affect Tor). It also works around a crash
2515 bug caused by some operating systems' response to the "POODLE" attack
2516 (which does affect Tor).
2518 o Major security fixes (also in 0.2.5.9-rc):
2519 - Disable support for SSLv3. All versions of OpenSSL in use with Tor
2520 today support TLS 1.0 or later, so we can safely turn off support
2521 for this old (and insecure) protocol. Fixes bug 13426.
2523 o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
2524 - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
2525 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
2526 13471. This is a workaround for an OpenSSL bug.
2529 Changes in version 0.2.5.8-rc - 2014-09-22
2530 Tor 0.2.5.8-rc is the second release candidate for the Tor 0.2.5.x
2531 series. It fixes a bug that affects consistency and speed when
2532 connecting to hidden services, and it updates the location of one of
2533 the directory authorities.
2536 - Clients now send the correct address for their chosen rendezvous
2537 point when trying to access a hidden service. They used to send
2538 the wrong address, which would still work some of the time because
2539 they also sent the identity digest of the rendezvous point, and if
2540 the hidden service happened to try connecting to the rendezvous
2541 point from a relay that already had a connection open to it,
2542 the relay would reuse that connection. Now connections to hidden
2543 services should be more robust and faster. Also, this bug meant
2544 that clients were leaking to the hidden service whether they were
2545 on a little-endian (common) or big-endian (rare) system, which for
2546 some users might have reduced their anonymity. Fixes bug 13151;
2547 bugfix on 0.2.1.5-alpha.
2549 o Directory authority changes:
2550 - Change IP address for gabelmoo (v3 directory authority).
2553 Changes in version 0.2.4.24 - 2014-09-22
2554 Tor 0.2.4.24 fixes a bug that affects consistency and speed when
2555 connecting to hidden services, and it updates the location of one of
2556 the directory authorities.
2559 - Clients now send the correct address for their chosen rendezvous
2560 point when trying to access a hidden service. They used to send
2561 the wrong address, which would still work some of the time because
2562 they also sent the identity digest of the rendezvous point, and if
2563 the hidden service happened to try connecting to the rendezvous
2564 point from a relay that already had a connection open to it,
2565 the relay would reuse that connection. Now connections to hidden
2566 services should be more robust and faster. Also, this bug meant
2567 that clients were leaking to the hidden service whether they were
2568 on a little-endian (common) or big-endian (rare) system, which for
2569 some users might have reduced their anonymity. Fixes bug 13151;
2570 bugfix on 0.2.1.5-alpha.
2572 o Directory authority changes:
2573 - Change IP address for gabelmoo (v3 directory authority).
2575 o Minor features (geoip):
2576 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
2580 Changes in version 0.2.5.7-rc - 2014-09-11
2581 Tor 0.2.5.7-rc fixes several regressions from earlier in the 0.2.5.x
2582 release series, and some long-standing bugs related to ORPort reachability
2583 testing and failure to send CREATE cells. It is the first release
2584 candidate for the Tor 0.2.5.x series.
2586 o Major bugfixes (client, startup):
2587 - Start making circuits as soon as DisabledNetwork is turned off.
2588 When Tor started with DisabledNetwork set, it would correctly
2589 conclude that it shouldn't build circuits, but it would mistakenly
2590 cache this conclusion, and continue believing it even when
2591 DisableNetwork is set to 0. Fixes the bug introduced by the fix
2592 for bug 11200; bugfix on 0.2.5.4-alpha.
2593 - Resume expanding abbreviations for command-line options. The fix
2594 for bug 4647 accidentally removed our hack from bug 586 that
2595 rewrote HashedControlPassword to __HashedControlSessionPassword
2596 when it appears on the commandline (which allowed the user to set
2597 her own HashedControlPassword in the torrc file while the
2598 controller generates a fresh session password for each run). Fixes
2599 bug 12948; bugfix on 0.2.5.1-alpha.
2600 - Warn about attempts to run hidden services and relays in the same
2601 process: that's probably not a good idea. Closes ticket 12908.
2603 o Major bugfixes (relay):
2604 - Avoid queuing or sending destroy cells for circuit ID zero when we
2605 fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
2606 Found and fixed by "cypherpunks".
2607 - Fix ORPort reachability detection on relays running behind a
2608 proxy, by correctly updating the "local" mark on the controlling
2609 channel when changing the address of an or_connection_t after the
2610 handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
2612 o Minor features (bridge):
2613 - Add an ExtORPortCookieAuthFileGroupReadable option to make the
2614 cookie file for the ExtORPort g+r by default.
2616 o Minor features (geoip):
2617 - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
2620 o Minor bugfixes (logging):
2621 - Reduce the log severity of the "Pluggable transport proxy does not
2622 provide any needed transports and will not be launched." message,
2623 since Tor Browser includes several ClientTransportPlugin lines in
2624 its torrc-defaults file, leading every Tor Browser user who looks
2625 at her logs to see these notices and wonder if they're dangerous.
2626 Resolves bug 13124; bugfix on 0.2.5.3-alpha.
2627 - Downgrade "Unexpected onionskin length after decryption" warning
2628 to a protocol-warn, since there's nothing relay operators can do
2629 about a client that sends them a malformed create cell. Resolves
2630 bug 12996; bugfix on 0.0.6rc1.
2631 - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
2632 cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
2633 - When logging information about an EXTEND2 or EXTENDED2 cell, log
2634 their names correctly. Fixes part of bug 12700; bugfix
2636 - When logging information about a relay cell whose command we don't
2637 recognize, log its command as an integer. Fixes part of bug 12700;
2638 bugfix on 0.2.1.10-alpha.
2639 - Escape all strings from the directory connection before logging
2640 them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
2642 o Minor bugfixes (controller):
2643 - Restore the functionality of CookieAuthFileGroupReadable. Fixes
2644 bug 12864; bugfix on 0.2.5.1-alpha.
2645 - Actually send TRANSPORT_LAUNCHED and HS_DESC events to
2646 controllers. Fixes bug 13085; bugfix on 0.2.5.1-alpha. Patch
2649 o Minor bugfixes (compilation):
2650 - Fix compilation of test.h with MSVC. Patch from Gisle Vanem;
2651 bugfix on 0.2.5.5-alpha.
2652 - Make the nmake make files work again. Fixes bug 13081. Bugfix on
2653 0.2.5.1-alpha. Patch from "NewEraCracker".
2654 - In routerlist_assert_ok(), don't take the address of a
2655 routerinfo's cache_info member unless that routerinfo is non-NULL.
2656 Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
2657 - Fix a large number of false positive warnings from the clang
2658 analyzer static analysis tool. This should make real warnings
2659 easier for clang analyzer to find. Patch from "teor". Closes
2662 o Distribution (systemd):
2663 - Verify configuration file via ExecStartPre in the systemd unit
2664 file. Patch from intrigeri; resolves ticket 12730.
2665 - Explicitly disable RunAsDaemon in the systemd unit file. Our
2666 current systemd unit uses "Type = simple", so systemd does not
2667 expect tor to fork. If the user has "RunAsDaemon 1" in their
2668 torrc, then things won't work as expected. This is e.g. the case
2669 on Debian (and derivatives), since there we pass "--defaults-torrc
2670 /usr/share/tor/tor-service-defaults-torrc" (that contains
2671 "RunAsDaemon 1") by default. Patch by intrigeri; resolves
2675 - Adjust the URLs in the README to refer to the new locations of
2676 several documents on the website. Fixes bug 12830. Patch from
2678 - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
2682 Changes in version 0.2.5.6-alpha - 2014-07-28
2683 Tor 0.2.5.6-alpha brings us a big step closer to slowing down the
2684 risk from guard rotation, and fixes a variety of other issues to get
2685 us closer to a release candidate.
2687 o Major features (also in 0.2.4.23):
2688 - Make the number of entry guards configurable via a new
2689 NumEntryGuards consensus parameter, and the number of directory
2690 guards configurable via a new NumDirectoryGuards consensus
2691 parameter. Implements ticket 12688.
2693 o Major bugfixes (also in 0.2.4.23):
2694 - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
2695 implementation that caused incorrect results on 32-bit
2696 implementations when certain malformed inputs were used along with
2697 a small class of private ntor keys. This bug does not currently
2698 appear to allow an attacker to learn private keys or impersonate a
2699 Tor server, but it could provide a means to distinguish 32-bit Tor
2700 implementations from 64-bit Tor implementations. Fixes bug 12694;
2701 bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
2705 - Perform circuit cleanup operations even when circuit
2706 construction operations are disabled (because the network is
2707 disabled, or because there isn't enough directory information).
2708 Previously, when we were not building predictive circuits, we
2709 were not closing expired circuits either. Fixes bug 8387; bugfix on
2710 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
2711 became more strict about when we have "enough directory information
2715 - Authorities now assign the Guard flag to the fastest 25% of the
2716 network (it used to be the fastest 50%). Also raise the consensus
2717 weight that guarantees the Guard flag from 250 to 2000. For the
2718 current network, this results in about 1100 guards, down from 2500.
2719 This step paves the way for moving the number of entry guards
2720 down to 1 (proposal 236) while still providing reasonable expected
2721 performance for most users. Implements ticket 12690.
2722 - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
2724 - Slightly enhance the diagnostic message for bug 12184.
2726 o Minor bugfixes (also in 0.2.4.23):
2727 - Warn and drop the circuit if we receive an inbound 'relay early'
2728 cell. Those used to be normal to receive on hidden service circuits
2729 due to bug 1038, but the buggy Tor versions are long gone from
2730 the network so we can afford to resume watching for them. Resolves
2731 the rest of bug 1038; bugfix on 0.2.1.19.
2732 - Correct a confusing error message when trying to extend a circuit
2733 via the control protocol but we don't know a descriptor or
2734 microdescriptor for one of the specified relays. Fixes bug 12718;
2735 bugfix on 0.2.3.1-alpha.
2738 - Fix compilation when building with bufferevents enabled. (This
2739 configuration is still not expected to work, however.)
2740 Fixes bugs 12438, 12474, 11578; bugfixes on 0.2.5.1-alpha and
2741 0.2.5.3-alpha. Patches from Anthony G. Basile and Sathyanarayanan
2743 - Compile correctly with builds and forks of OpenSSL (such as
2744 LibreSSL) that disable compression. Fixes bug 12602; bugfix on
2745 0.2.1.1-alpha. Patch from "dhill".
2748 Changes in version 0.2.4.23 - 2014-07-28
2749 Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
2750 guard rotation, and also backports several important fixes from the
2751 Tor 0.2.5 alpha release series.
2754 - Clients now look at the "usecreatefast" consensus parameter to
2755 decide whether to use CREATE_FAST or CREATE cells for the first hop
2756 of their circuit. This approach can improve security on connections
2757 where Tor's circuit handshake is stronger than the available TLS
2758 connection security levels, but the tradeoff is more computational
2759 load on guard relays. Implements proposal 221. Resolves ticket 9386.
2760 - Make the number of entry guards configurable via a new
2761 NumEntryGuards consensus parameter, and the number of directory
2762 guards configurable via a new NumDirectoryGuards consensus
2763 parameter. Implements ticket 12688.
2766 - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
2767 implementation that caused incorrect results on 32-bit
2768 implementations when certain malformed inputs were used along with
2769 a small class of private ntor keys. This bug does not currently
2770 appear to allow an attacker to learn private keys or impersonate a
2771 Tor server, but it could provide a means to distinguish 32-bit Tor
2772 implementations from 64-bit Tor implementations. Fixes bug 12694;
2773 bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
2777 - Warn and drop the circuit if we receive an inbound 'relay early'
2778 cell. Those used to be normal to receive on hidden service circuits
2779 due to bug 1038, but the buggy Tor versions are long gone from
2780 the network so we can afford to resume watching for them. Resolves
2781 the rest of bug 1038; bugfix on 0.2.1.19.
2782 - Correct a confusing error message when trying to extend a circuit
2783 via the control protocol but we don't know a descriptor or
2784 microdescriptor for one of the specified relays. Fixes bug 12718;
2785 bugfix on 0.2.3.1-alpha.
2786 - Avoid an illegal read from stack when initializing the TLS
2787 module using a version of OpenSSL without all of the ciphers
2788 used by the v2 link handshake. Fixes bug 12227; bugfix on
2789 0.2.4.8-alpha. Found by "starlight".
2792 - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
2796 Changes in version 0.2.5.5-alpha - 2014-06-18
2797 Tor 0.2.5.5-alpha fixes a wide variety of remaining issues in the Tor
2798 0.2.5.x release series, including a couple of DoS issues, some
2799 performance regressions, a large number of bugs affecting the Linux
2800 seccomp2 sandbox code, and various other bugfixes. It also adds
2801 diagnostic bugfixes for a few tricky issues that we're trying to
2804 o Major features (security, traffic analysis resistance):
2805 - Several major improvements to the algorithm used to decide when to
2806 close TLS connections. Previous versions of Tor closed connections
2807 at a fixed interval after the last time a non-padding cell was
2808 sent over the connection, regardless of the target of the
2809 connection. Now, we randomize the intervals by adding up to 50% of
2810 their base value, we measure the length of time since connection
2811 last had at least one circuit, and we allow connections to known
2812 ORs to remain open a little longer (15 minutes instead of 3
2813 minutes minimum). These changes should improve Tor's resistance
2814 against some kinds of traffic analysis, and lower some overhead
2815 from needlessly closed connections. Fixes ticket 6799.
2816 Incidentally fixes ticket 12023; bugfix on 0.2.5.1-alpha.
2818 o Major bugfixes (security, OOM, new since 0.2.5.4-alpha, also in 0.2.4.22):
2819 - Fix a memory leak that could occur if a microdescriptor parse
2820 fails during the tokenizing step. This bug could enable a memory
2821 exhaustion attack by directory servers. Fixes bug 11649; bugfix
2824 o Major bugfixes (security, directory authorities):
2825 - Directory authorities now include a digest of each relay's
2826 identity key as a part of its microdescriptor.
2828 This is a workaround for bug 11743 (reported by "cypherpunks"),
2829 where Tor clients do not support receiving multiple
2830 microdescriptors with the same SHA256 digest in the same
2831 consensus. When clients receive a consensus like this, they only
2832 use one of the relays. Without this fix, a hostile relay could
2833 selectively disable some client use of target relays by
2834 constructing a router descriptor with a different identity and the
2835 same microdescriptor parameters and getting the authorities to
2836 list it in a microdescriptor consensus. This fix prevents an
2837 attacker from causing a microdescriptor collision, because the
2838 router's identity is not forgeable.
2840 o Major bugfixes (relay):
2841 - Use a direct dirport connection when uploading non-anonymous
2842 descriptors to the directory authorities. Previously, relays would
2843 incorrectly use tunnel connections under a fairly wide variety of
2844 circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
2845 - When a circuit accidentally has the same circuit ID for its
2846 forward and reverse direction, correctly detect the direction of
2847 cells using that circuit. Previously, this bug made roughly one
2848 circuit in a million non-functional. Fixes bug 12195; this is a
2849 bugfix on every version of Tor.
2851 o Major bugfixes (client, pluggable transports):
2852 - When managing pluggable transports, use OS notification facilities
2853 to learn if they have crashed, and don't attempt to kill any
2854 process that has already exited. Fixes bug 8746; bugfix
2857 o Minor features (diagnostic):
2858 - When logging a warning because of bug 7164, additionally check the
2859 hash table for consistency (as proposed on ticket 11737). This may
2860 help diagnose bug 7164.
2861 - When we log a heartbeat, log how many one-hop circuits we have
2862 that are at least 30 minutes old, and log status information about
2863 a few of them. This is an attempt to track down bug 8387.
2864 - When encountering an unexpected CR while writing text to a file on
2865 Windows, log the name of the file. Should help diagnosing
2867 - Give more specific warnings when a client notices that an onion
2868 handshake has failed. Fixes ticket 9635.
2869 - Add significant new logging code to attempt to diagnose bug 12184,
2870 where relays seem to run out of available circuit IDs.
2871 - Improve the diagnostic log message for bug 8387 even further to
2872 try to improve our odds of figuring out why one-hop directory
2873 circuits sometimes do not get closed.
2875 o Minor features (security, memory management):
2876 - Memory allocation tricks (mempools and buffer freelists) are now
2877 disabled by default. You can turn them back on with
2878 --enable-mempools and --enable-buf-freelists respectively. We're
2879 disabling these features because malloc performance is good enough
2880 on most platforms, and a similar feature in OpenSSL exacerbated
2881 exploitation of the Heartbleed attack. Resolves ticket 11476.
2883 o Minor features (security):
2884 - Apply the secure SipHash-2-4 function to the hash table mapping
2885 circuit IDs and channels to circuits. We missed this one when we
2886 were converting all the other hash functions to use SipHash back
2887 in 0.2.5.3-alpha. Resolves ticket 11750.
2889 o Minor features (build):
2890 - The configure script has a --disable-seccomp option to turn off
2891 support for libseccomp on systems that have it, in case it (or
2892 Tor's use of it) is broken. Resolves ticket 11628.
2894 o Minor features (other):
2895 - Update geoip and geoip6 to the June 4 2014 Maxmind GeoLite2
2898 o Minor bugfixes (security, new since 0.2.5.4-alpha, also in 0.2.4.22):
2899 - When running a hidden service, do not allow TunneledDirConns 0;
2900 this will keep the hidden service from running, and also
2901 make it publish its descriptors directly over HTTP. Fixes bug 10849;
2902 bugfix on 0.2.1.1-alpha.
2904 o Minor bugfixes (performance):
2905 - Avoid a bug where every successful connection made us recompute
2906 the flag telling us whether we have sufficient information to
2907 build circuits. Previously, we would forget our cached value
2908 whenever we successfully opened a channel (or marked a router as
2909 running or not running for any other reason), regardless of
2910 whether we had previously believed the router to be running. This
2911 forced us to run an expensive update operation far too often.
2912 Fixes bug 12170; bugfix on 0.1.2.1-alpha.
2913 - Avoid using tor_memeq() for checking relay cell integrity. This
2914 removes a possible performance bottleneck. Fixes part of bug
2915 12169; bugfix on 0.2.1.31.
2917 o Minor bugfixes (compilation):
2918 - Fix compilation of test_status.c when building with MVSC. Bugfix
2919 on 0.2.5.4-alpha. Patch from Gisle Vanem.
2920 - Resolve GCC complaints on OpenBSD about discarding constness in
2921 TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
2922 on 0.1.1.23. Patch from Dana Koch.
2923 - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
2924 treatment of long and time_t as comparable types. Fixes part of
2925 bug 11633. Patch from Dana Koch.
2926 - Make Tor compile correctly with --disable-buf-freelists. Fixes bug
2927 11623; bugfix on 0.2.5.3-alpha.
2928 - When deciding whether to build the 64-bit curve25519
2929 implementation, detect platforms where we can compile 128-bit
2930 arithmetic but cannot link it. Fixes bug 11729; bugfix on
2931 0.2.4.8-alpha. Patch from "conradev".
2932 - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
2933 bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
2934 - Fix compilation with dmalloc. Fixes bug 11605; bugfix
2937 o Minor bugfixes (Directory server):
2938 - When sending a compressed set of descriptors or microdescriptors,
2939 make sure to finalize the zlib stream. Previously, we would write
2940 all the compressed data, but if the last descriptor we wanted to
2941 send was missing or too old, we would not mark the stream as
2942 finished. This caused problems for decompression tools. Fixes bug
2943 11648; bugfix on 0.1.1.23.
2945 o Minor bugfixes (Linux seccomp sandbox):
2946 - Make the seccomp sandbox code compile under ARM Linux. Fixes bug
2947 11622; bugfix on 0.2.5.1-alpha.
2948 - Avoid crashing when re-opening listener ports with the seccomp
2949 sandbox active. Fixes bug 12115; bugfix on 0.2.5.1-alpha.
2950 - Avoid crashing with the seccomp sandbox enabled along with
2951 ConstrainedSockets. Fixes bug 12139; bugfix on 0.2.5.1-alpha.
2952 - When we receive a SIGHUP with the sandbox enabled, correctly
2953 support rotating our log files. Fixes bug 12032; bugfix
2955 - Avoid crash when running with sandboxing enabled and
2956 DirReqStatistics not disabled. Fixes bug 12035; bugfix
2958 - Fix a "BUG" warning when trying to write bridge-stats files with
2959 the Linux syscall sandbox filter enabled. Fixes bug 12041; bugfix
2961 - Prevent the sandbox from crashing on startup when run with the
2962 --enable-expensive-hardening configuration option. Fixes bug
2963 11477; bugfix on 0.2.5.4-alpha.
2964 - When running with DirPortFrontPage and sandboxing both enabled,
2965 reload the DirPortFrontPage correctly when restarting. Fixes bug
2966 12028; bugfix on 0.2.5.1-alpha.
2967 - Don't try to enable the sandbox when using the Tor binary to check
2968 its configuration, hash a passphrase, or so on. Doing so was
2969 crashing on startup for some users. Fixes bug 11609; bugfix
2971 - Avoid warnings when running with sandboxing and node statistics
2972 enabled at the same time. Fixes part of 12064; bugfix on
2973 0.2.5.1-alpha. Patch from Michael Wolf.
2974 - Avoid warnings when running with sandboxing enabled at the same
2975 time as cookie authentication, hidden services, or directory
2976 authority voting. Fixes part of 12064; bugfix on 0.2.5.1-alpha.
2977 - Do not allow options that require calls to exec to be enabled
2978 alongside the seccomp2 sandbox: they will inevitably crash. Fixes
2979 bug 12043; bugfix on 0.2.5.1-alpha.
2980 - Handle failures in getpwnam()/getpwuid() when running with the
2981 User option set and the Linux syscall sandbox enabled. Fixes bug
2982 11946; bugfix on 0.2.5.1-alpha.
2983 - Refactor the getaddrinfo workaround that the seccomp sandbox uses
2984 to avoid calling getaddrinfo() after installing the sandbox
2985 filters. Previously, it preloaded a cache with the IPv4 address
2986 for our hostname, and nothing else. Now, it loads the cache with
2987 every address that it used to initialize the Tor process. Fixes
2988 bug 11970; bugfix on 0.2.5.1-alpha.
2990 o Minor bugfixes (pluggable transports):
2991 - Enable the ExtORPortCookieAuthFile option, to allow changing the
2992 default location of the authentication token for the extended OR
2993 Port as used by sever-side pluggable transports. We had
2994 implemented this option before, but the code to make it settable
2995 had been omitted. Fixes bug 11635; bugfix on 0.2.5.1-alpha.
2996 - Avoid another 60-second delay when starting Tor in a pluggable-
2997 transport-using configuration when we already have cached
2998 descriptors for our bridges. Fixes bug 11965; bugfix
3001 o Minor bugfixes (client):
3002 - Avoid "Tried to open a socket with DisableNetwork set" warnings
3003 when starting a client with bridges configured and DisableNetwork
3004 set. (Tor launcher starts Tor with DisableNetwork set the first
3005 time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
3007 o Minor bugfixes (testing):
3008 - The Python parts of the test scripts now work on Python 3 as well
3009 as Python 2, so systems where '/usr/bin/python' is Python 3 will
3010 no longer have the tests break. Fixes bug 11608; bugfix
3012 - When looking for versions of python that we could run the tests
3013 with, check for "python2.7" and "python3.3"; previously we were
3014 only looking for "python", "python2", and "python3". Patch from
3015 Dana Koch. Fixes bug 11632; bugfix on 0.2.5.2-alpha.
3016 - Fix all valgrind warnings produced by the unit tests. There were
3017 over a thousand memory leak warnings previously, mostly produced
3018 by forgetting to free things in the unit test code. Fixes bug
3019 11618, bugfixes on many versions of Tor.
3021 o Minor bugfixes (tor-fw-helper):
3022 - Give a correct log message when tor-fw-helper fails to launch.
3023 (Previously, we would say something like "tor-fw-helper sent us a
3024 string we could not parse".) Fixes bug 9781; bugfix
3027 o Minor bugfixes (relay, threading):
3028 - Check return code on spawn_func() in cpuworker code, so that we
3029 don't think we've spawned a nonworking cpuworker and write junk to
3030 it forever. Fix related to bug 4345; bugfix on all released Tor
3031 versions. Found by "skruffy".
3032 - Use a pthread_attr to make sure that spawn_func() cannot return an
3033 error while at the same time launching a thread. Fix related to
3034 bug 4345; bugfix on all released Tor versions. Reported
3037 o Minor bugfixes (relay, oom prevention):
3038 - Correctly detect the total available system memory. We tried to do
3039 this in 0.2.5.4-alpha, but the code was set up to always return an
3040 error value, even on success. Fixes bug 11805; bugfix
3043 o Minor bugfixes (relay, other):
3044 - We now drop CREATE cells for already-existent circuit IDs and for
3045 zero-valued circuit IDs, regardless of other factors that might
3046 otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
3048 - Avoid an illegal read from stack when initializing the TLS module
3049 using a version of OpenSSL without all of the ciphers used by the
3050 v2 link handshake. Fixes bug 12227; bugfix on 0.2.4.8-alpha. Found
3052 - When rejecting DATA cells for stream_id zero, still count them
3053 against the circuit's deliver window so that we don't fail to send
3054 a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
3056 o Minor bugfixes (logging):
3057 - Fix a misformatted log message about delayed directory fetches.
3058 Fixes bug 11654; bugfix on 0.2.5.3-alpha.
3059 - Squelch a spurious LD_BUG message "No origin circuit for
3060 successful SOCKS stream" in certain hidden service failure cases;
3064 - Include a tor.service file in contrib/dist for use with systemd.
3065 Some distributions will be able to use this file unmodified;
3066 others will need to tweak it, or write their own. Patch from Jamie
3067 Nguyen; resolves ticket 8368.
3070 - Clean up several option names in the manpage to match their real
3071 names, add the missing documentation for a couple of testing and
3072 directory authority options, remove the documentation for a
3073 V2-directory fetching option that no longer exists. Resolves
3075 - Correct the documenation so that it lists the correct directory
3076 for the stats files. (They are in a subdirectory called "stats",
3078 - In the manpage, move more authority-only options into the
3079 directory authority section so that operators of regular directory
3080 caches don't get confused.
3083 - The contrib directory has been sorted and tidied. Before, it was
3084 an unsorted dumping ground for useful and not-so-useful things.
3085 Now, it is divided based on functionality, and the items which
3086 seemed to be nonfunctional or useless have been removed. Resolves
3087 ticket 8966; based on patches from "rl1987".
3090 - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
3091 and MTBF calculations, but that nobody was using. Fixes ticket 11742.
3092 - The TunnelDirConns and PreferTunnelledDirConns options no longer
3093 exist; tunneled directory connections have been available since
3094 0.1.2.5-alpha, and turning them off is not a good idea. This is a
3095 brute-force fix for 10849, where "TunnelDirConns 0" would break
3099 Changes in version 0.2.4.22 - 2014-05-16
3100 Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
3101 alpha release series. These include blocking all authority signing
3102 keys that may have been affected by the OpenSSL "heartbleed" bug,
3103 choosing a far more secure set of TLS ciphersuites by default, closing
3104 a couple of memory leaks that could be used to run a target relay out
3105 of RAM, and several others.
3107 o Major features (security, backport from 0.2.5.4-alpha):
3108 - Block authority signing keys that were used on authorities
3109 vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
3110 don't have any evidence that these keys _were_ compromised; we're
3111 doing this to be prudent.) Resolves ticket 11464.
3113 o Major bugfixes (security, OOM):
3114 - Fix a memory leak that could occur if a microdescriptor parse
3115 fails during the tokenizing step. This bug could enable a memory
3116 exhaustion attack by directory servers. Fixes bug 11649; bugfix
3119 o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
3120 - The relay ciphersuite list is now generated automatically based on
3121 uniform criteria, and includes all OpenSSL ciphersuites with
3122 acceptable strength and forward secrecy. Previously, we had left
3123 some perfectly fine ciphersuites unsupported due to omission or
3124 typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
3125 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
3126 - Relays now trust themselves to have a better view than clients of
3127 which TLS ciphersuites are better than others. (Thanks to bug
3128 11513, the relay list is now well-considered, whereas the client
3129 list has been chosen mainly for anti-fingerprinting purposes.)
3130 Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
3131 CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
3132 AES128. Resolves ticket 11528.
3133 - Clients now try to advertise the same list of ciphersuites as
3134 Firefox 28. This change enables selection of (fast) GCM
3135 ciphersuites, disables some strange old ciphers, and stops
3136 advertising the ECDH (not to be confused with ECDHE) ciphersuites.
3137 Resolves ticket 11438.
3139 o Minor bugfixes (configuration, security):
3140 - When running a hidden service, do not allow TunneledDirConns 0:
3141 trying to set that option together with a hidden service would
3142 otherwise prevent the hidden service from running, and also make
3143 it publish its descriptors directly over HTTP. Fixes bug 10849;
3144 bugfix on 0.2.1.1-alpha.
3146 o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
3147 - Avoid sending a garbage value to the controller when a circuit is
3148 cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
3150 o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
3151 - Stop leaking memory when we successfully resolve a PTR record.
3152 Fixes bug 11437; bugfix on 0.2.4.7-alpha.
3154 o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
3155 - Avoid 60-second delays in the bootstrapping process when Tor is
3156 launching for a second time while using bridges. Fixes bug 9229;
3157 bugfix on 0.2.0.3-alpha.
3159 o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
3160 - Give the correct URL in the warning message when trying to run a
3161 relay on an ancient version of Windows. Fixes bug 9393.
3163 o Minor bugfixes (compilation):
3164 - Fix a compilation error when compiling with --disable-curve25519.
3165 Fixes bug 9700; bugfix on 0.2.4.17-rc.
3168 - Downgrade the warning severity for the the "md was still
3169 referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
3170 for trying to diagnose this bug, and the current warning in
3171 earlier versions of tor achieves nothing useful. Addresses warning
3174 o Minor features (log verbosity, backport from 0.2.5.4-alpha):
3175 - When we run out of usable circuit IDs on a channel, log only one
3176 warning for the whole channel, and describe how many circuits
3177 there were on the channel. Fixes part of ticket 11553.
3179 o Minor features (security, backport from 0.2.5.4-alpha):
3180 - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
3181 leave the default at 8GBytes), to better support Raspberry Pi
3182 users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
3184 o Documentation (backport from 0.2.5.4-alpha):
3185 - Correctly document that we search for a system torrc file before
3186 looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
3190 Changes in version 0.2.5.4-alpha - 2014-04-25
3191 Tor 0.2.5.4-alpha includes several security and performance
3192 improvements for clients and relays, including blacklisting authority
3193 signing keys that were used while susceptible to the OpenSSL
3194 "heartbleed" bug, fixing two expensive functions on busy relays,
3195 improved TLS ciphersuite preference lists, support for run-time
3196 hardening on compilers that support AddressSanitizer, and more work on
3197 the Linux sandbox code.
3199 There are also several usability fixes for clients (especially clients
3200 that use bridges), two new TransPort protocols supported (one on
3201 OpenBSD, one on FreeBSD), and various other bugfixes.
3203 This release marks end-of-life for Tor 0.2.2.x; those Tor versions
3204 have accumulated many known flaws; everyone should upgrade.
3206 o Major features (security):
3207 - If you don't specify MaxMemInQueues yourself, Tor now tries to
3208 pick a good value based on your total system memory. Previously,
3209 the default was always 8 GB. You can still override the default by
3210 setting MaxMemInQueues yourself. Resolves ticket 11396.
3211 - Block authority signing keys that were used on authorities
3212 vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
3213 don't have any evidence that these keys _were_ compromised; we're
3214 doing this to be prudent.) Resolves ticket 11464.
3216 o Major features (relay performance):
3217 - Speed up server-side lookups of rendezvous and introduction point
3218 circuits by using hashtables instead of linear searches. These
3219 functions previously accounted between 3 and 7% of CPU usage on
3220 some busy relays. Resolves ticket 9841.
3221 - Avoid wasting CPU when extending a circuit over a channel that is
3222 nearly out of circuit IDs. Previously, we would do a linear scan
3223 over possible circuit IDs before finding one or deciding that we
3224 had exhausted our possibilities. Now, we try at most 64 random
3225 circuit IDs before deciding that we probably won't succeed. Fixes
3226 a possible root cause of ticket 11553.
3228 o Major features (seccomp2 sandbox, Linux only):
3229 - The seccomp2 sandbox can now run a test network for multiple hours
3230 without crashing. The sandbox is still experimental, and more bugs
3231 will probably turn up. To try it, enable "Sandbox 1" on a Linux
3232 host. Resolves ticket 11351.
3233 - Strengthen sandbox code: the sandbox can now test the arguments
3234 for rename(), and blocks _sysctl() entirely. Resolves another part
3236 - When the sandbox blocks a system call, it now tries to log a stack
3237 trace before exiting. Resolves ticket 11465.
3239 o Major bugfixes (TLS cipher selection):
3240 - The relay ciphersuite list is now generated automatically based on
3241 uniform criteria, and includes all OpenSSL ciphersuites with
3242 acceptable strength and forward secrecy. Previously, we had left
3243 some perfectly fine ciphersuites unsupported due to omission or
3244 typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
3245 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
3246 - Relays now trust themselves to have a better view than clients of
3247 which TLS ciphersuites are better than others. (Thanks to bug
3248 11513, the relay list is now well-considered, whereas the client
3249 list has been chosen mainly for anti-fingerprinting purposes.)
3250 Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
3251 CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
3252 AES128. Resolves ticket 11528.
3253 - Clients now try to advertise the same list of ciphersuites as
3254 Firefox 28. This change enables selection of (fast) GCM
3255 ciphersuites, disables some strange old ciphers, and stops
3256 advertising the ECDH (not to be confused with ECDHE) ciphersuites.
3257 Resolves ticket 11438.
3259 o Major bugfixes (bridge client):
3260 - Avoid 60-second delays in the bootstrapping process when Tor is
3261 launching for a second time while using bridges. Fixes bug 9229;
3262 bugfix on 0.2.0.3-alpha.
3264 o Minor features (transparent proxy, *BSD):
3265 - Support FreeBSD's ipfw firewall interface for TransPort ports on
3266 FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
3267 10267; patch from "yurivict".
3268 - Support OpenBSD's divert-to rules with the pf firewall for
3269 transparent proxy ports. To enable it, set "TransProxyType
3270 pf-divert". This allows Tor to run a TransPort transparent proxy
3271 port on OpenBSD 4.4 or later without root privileges. See the
3272 pf.conf(5) manual page for information on configuring pf to use
3273 divert-to rules. Closes ticket 10896; patch from Dana Koch.
3275 o Minor features (security):
3276 - New --enable-expensive-hardening option to enable security
3277 hardening options that consume nontrivial amounts of CPU and
3278 memory. Right now, this includes AddressSanitizer and UbSan, which
3279 are supported in newer versions of GCC and Clang. Closes ticket
3282 o Minor features (log verbosity):
3283 - Demote the message that we give when a flushing connection times
3284 out for too long from NOTICE to INFO. It was usually meaningless.
3285 Resolves ticket 5286.
3286 - Don't log so many notice-level bootstrapping messages at startup
3287 about downloading descriptors. Previously, we'd log a notice
3288 whenever we learned about more routers. Now, we only log a notice
3289 at every 5% of progress. Fixes bug 9963.
3290 - Warn less verbosely when receiving a malformed
3291 ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
3292 - When we run out of usable circuit IDs on a channel, log only one
3293 warning for the whole channel, and describe how many circuits
3294 there were on the channel. Fixes part of ticket 11553.
3296 o Minor features (relay):
3297 - If a circuit timed out for at least 3 minutes, check if we have a
3298 new external IP address, and publish a new descriptor with the new
3299 IP address if it changed. Resolves ticket 2454.
3301 o Minor features (controller):
3302 - Make the entire exit policy available from the control port via
3303 GETINFO exit-policy/*. Implements enhancement 7952. Patch from
3305 - Because of the fix for ticket 11396, the real limit for memory
3306 usage may no longer match the configured MaxMemInQueues value. The
3307 real limit is now exposed via GETINFO limits/max-mem-in-queues.
3309 o Minor features (bridge client):
3310 - Report a more useful failure message when we can't connect to a
3311 bridge because we don't have the right pluggable transport
3312 configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
3314 o Minor features (diagnostic):
3315 - Add more log messages to diagnose bug 7164, which causes
3316 intermittent "microdesc_free() called but md was still referenced"
3317 warnings. We now include more information, to figure out why we
3318 might be cleaning a microdescriptor for being too old if it's
3319 still referenced by a live node_t object.
3321 o Minor bugfixes (client, DNSPort):
3322 - When using DNSPort, try to respond to AAAA requests with AAAA
3323 answers. Previously, we hadn't looked at the request type when
3324 deciding which answer type to prefer. Fixes bug 10468; bugfix on
3326 - When receiving a DNS query for an unsupported record type, reply
3327 with no answer rather than with a NOTIMPL error. This behavior
3328 isn't correct either, but it will break fewer client programs, we
3329 hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
3332 o Minor bugfixes (exit relay):
3333 - Stop leaking memory when we successfully resolve a PTR record.
3334 Fixes bug 11437; bugfix on 0.2.4.7-alpha.
3336 o Minor bugfixes (bridge client):
3337 - Stop accepting bridge lines containing hostnames. Doing so would
3338 cause clients to perform DNS requests on the hostnames, which was
3339 not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
3340 - Avoid a 60-second delay in the bootstrapping process when a Tor
3341 client with pluggable transports re-reads its configuration at
3342 just the wrong time. Re-fixes bug 11156; bugfix on 0.2.5.3-alpha.
3344 o Minor bugfixes (client, logging during bootstrap):
3345 - Warn only once if we start logging in an unsafe way. Previously,
3346 we complain as many times as we had problems. Fixes bug 9870;
3347 bugfix on 0.2.5.1-alpha.
3348 - Only report the first fatal bootstrap error on a given OR
3349 connection. This stops us from telling the controller bogus error
3350 messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
3351 - Be more helpful when trying to run sandboxed on Linux without
3352 libseccomp. Instead of saying "Sandbox is not implemented on this
3353 platform", we now explain that we need to be built with
3354 libseccomp. Fixes bug 11543; bugfix on 0.2.5.1-alpha.
3355 - Avoid generating spurious warnings when starting with
3356 DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
3359 o Minor bugfixes (closing OR connections):
3360 - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
3361 check if it's an or_connection_t and correctly call
3362 connection_or_close_for_error() rather than
3363 connection_mark_for_close() directly. Fixes bug 11304; bugfix on
3365 - When closing all connections on setting DisableNetwork to 1, use
3366 connection_or_close_normally() rather than closing OR connections
3367 out from under the channel layer. Fixes bug 11306; bugfix on
3370 o Minor bugfixes (controller):
3371 - Avoid sending a garbage value to the controller when a circuit is
3372 cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
3374 o Minor bugfixes (tor-fw-helper):
3375 - Allow tor-fw-helper to build again by adding src/ext to its
3376 CPPFLAGS. Fixes bug 11296; bugfix on 0.2.5.3-alpha.
3378 o Minor bugfixes (bridges):
3379 - Avoid potential crashes or bad behavior when launching a
3380 server-side managed proxy with ORPort or ExtORPort temporarily
3381 disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
3383 o Minor bugfixes (platform-specific):
3384 - Fix compilation on Solaris, which does not have <endian.h>. Fixes
3385 bug 11426; bugfix on 0.2.5.3-alpha.
3386 - When dumping a malformed directory object to disk, save it in
3387 binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
3389 - Don't report failures from make_socket_reuseable() on incoming
3390 sockets on OSX: this can happen when incoming connections close
3391 early. Fixes bug 10081.
3393 o Minor bugfixes (trivial memory leaks):
3394 - Fix a small memory leak when signing a directory object. Fixes bug
3395 11275; bugfix on 0.2.4.13-alpha.
3396 - Free placeholder entries in our circuit table at exit; fixes a
3397 harmless memory leak. Fixes bug 11278; bugfix on 0.2.5.1-alpha.
3398 - Don't re-initialize a second set of OpenSSL mutexes when starting
3399 up. Previously, we'd make one set of mutexes, and then immediately
3400 replace them with another. Fixes bug 11726; bugfix on
3402 - Resolve some memory leaks found by coverity in the unit tests, on
3403 exit in tor-gencert, and on a failure to compute digests for our
3404 own keys when generating a v3 networkstatus vote. These leaks
3405 should never have affected anyone in practice.
3407 o Minor bugfixes (hidden service):
3408 - Only retry attempts to connect to a chosen rendezvous point 8
3409 times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
3411 o Minor bugfixes (misc code correctness):
3412 - Fix various instances of undefined behavior in channeltls.c,
3413 tor_memmem(), and eventdns.c that would cause us to construct
3414 pointers to memory outside an allocated object. (These invalid
3415 pointers were not accessed, but C does not even allow them to
3416 exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
3417 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
3418 - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
3419 fix some miscellaneous errors in our tests and codebase. Fixes bug
3420 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
3421 - Always check return values for unlink, munmap, UnmapViewOfFile;
3422 check strftime return values more often. In some cases all we can
3423 do is report a warning, but this may help prevent deeper bugs from
3424 going unnoticed. Closes ticket 8787; bugfixes on many, many tor
3426 - Fix numerous warnings from the clang "scan-build" static analyzer.
3427 Some of these are programming style issues; some of them are false
3428 positives that indicated awkward code; some are undefined behavior
3429 cases related to constructing (but not using) invalid pointers;
3430 some are assumptions about API behavior; some are (harmlessly)
3431 logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
3432 correct; and one or two are genuine bugs that weren't reachable
3433 from the rest of the program. Fixes bug 8793; bugfixes on many,
3437 - Build the torify.1 manpage again. Previously, we were only trying
3438 to build it when also building tor-fw-helper. That's why we didn't
3439 notice that we'd broken the ability to build it. Fixes bug 11321;
3440 bugfix on 0.2.5.1-alpha.
3441 - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
3442 11061; bugfix on 0.2.4.7-alpha.
3443 - Correctly document that we search for a system torrc file before
3444 looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
3446 - Resolve warnings from Doxygen.
3448 o Code simplifications and refactoring:
3449 - Remove is_internal_IP() function. Resolves ticket 4645.
3450 - Remove unused function circuit_dump_by_chan from circuitlist.c.
3451 Closes issue 9107; patch from "marek".
3452 - Change our use of the ENUM_BF macro to avoid declarations that
3455 o Deprecated versions:
3456 - Tor 0.2.2.x has reached end-of-life; it has received no patches or
3457 attention for some while. Directory authorities no longer accept
3458 descriptors from relays running any version of Tor prior to Tor
3459 0.2.3.16-alpha. Resolves ticket 11149.
3462 - New macros in test.h to simplify writing mock-functions for unit
3463 tests. Part of ticket 11507. Patch from Dana Koch.
3464 - Complete tests for the status.c module. Resolves ticket 11507.
3465 Patch from Dana Koch.
3468 - Remove all code for the long unused v1 directory protocol.
3469 Resolves ticket 11070.
3472 Changes in version 0.2.5.3-alpha - 2014-03-22
3473 Tor 0.2.5.3-alpha includes all the fixes from 0.2.4.21. It contains
3474 two new anti-DoS features for Tor relays, resolves a bug that kept
3475 SOCKS5 support for IPv6 from working, fixes several annoying usability
3476 issues for bridge users, and removes more old code for unused
3479 The Tor 0.2.5.x release series is now in patch-freeze: no feature
3480 patches not already written will be considered for inclusion in 0.2.5.x.
3482 o Major features (relay security, DoS-resistance):
3483 - When deciding whether we have run out of memory and we need to
3484 close circuits, also consider memory allocated in buffers for
3485 streams attached to each circuit.
3487 This change, which extends an anti-DoS feature introduced in
3488 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
3489 better resist more memory-based DoS attacks than before. Since the
3490 MaxMemInCellQueues option now applies to all queues, it is renamed
3491 to MaxMemInQueues. This feature fixes bug 10169.
3492 - Avoid hash-flooding denial-of-service attacks by using the secure
3493 SipHash-2-4 hash function for our hashtables. Without this
3494 feature, an attacker could degrade performance of a targeted
3495 client or server by flooding their data structures with a large
3496 number of entries to be stored at the same hash table position,
3497 thereby slowing down the Tor instance. With this feature, hash
3498 table positions are derived from a randomized cryptographic key,
3499 and an attacker cannot predict which entries will collide. Closes
3501 - Decrease the lower limit of MaxMemInQueues to 256 MBytes (but leave
3502 the default at 8GBytes), to better support Raspberry Pi users. Fixes
3503 bug 9686; bugfix on 0.2.4.14-alpha.
3505 o Minor features (bridges, pluggable transports):
3506 - Bridges now write the SHA1 digest of their identity key
3507 fingerprint (that is, a hash of a hash of their public key) to
3508 notice-level logs, and to a new hashed-fingerprint file. This
3509 information will help bridge operators look up their bridge in
3510 Globe and similar tools. Resolves ticket 10884.
3511 - Improve the message that Tor displays when running as a bridge
3512 using pluggable transports without an Extended ORPort listener.
3513 Also, log the message in the log file too. Resolves ticket 11043.
3515 o Minor features (other):
3516 - Add a new option, PredictedPortsRelevanceTime, to control how long
3517 after having received a request to connect to a given port Tor
3518 will try to keep circuits ready in anticipation of future requests
3519 for that port. Patch from "unixninja92"; implements ticket 9176.
3520 - Generate a warning if any ports are listed in the SocksPolicy,
3521 DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
3522 AuthDirBadExit options. (These options only support address
3523 ranges.) Fixes part of ticket 11108.
3524 - Update geoip and geoip6 to the February 7 2014 Maxmind GeoLite2
3527 o Minor bugfixes (new since 0.2.5.2-alpha, also in 0.2.4.21):
3528 - Build without warnings under clang 3.4. (We have some macros that
3529 define static functions only some of which will get used later in
3530 the module. Starting with clang 3.4, these give a warning unless the
3531 unused attribute is set on them.) Resolves ticket 10904.
3532 - Fix build warnings about missing "a2x" comment when building the
3533 manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
3534 Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
3536 o Minor bugfixes (client):
3537 - Improve the log message when we can't connect to a hidden service
3538 because all of the hidden service directory nodes hosting its
3539 descriptor are excluded. Improves on our fix for bug 10722, which
3540 was a bugfix on 0.2.0.10-alpha.
3541 - Raise a control port warning when we fail to connect to all of
3542 our bridges. Previously, we didn't inform the controller, and
3543 the bootstrap process would stall. Fixes bug 11069; bugfix on
3545 - Exit immediately when a process-owning controller exits.
3546 Previously, tor relays would wait for a little while after their
3547 controller exited, as if they had gotten an INT signal -- but this
3548 was problematic, since there was no feedback for the user. To do a
3549 clean shutdown, controllers should send an INT signal and give Tor
3550 a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
3551 - Stop attempting to connect to bridges before our pluggable
3552 transports are configured (harmless but resulted in some erroneous
3553 log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
3554 - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
3555 generating incorrect SOCKS5 responses, and confusing client
3556 applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
3558 o Minor bugfixes (relays and bridges):
3559 - Avoid crashing on a malformed resolv.conf file when running a
3560 relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
3561 - Non-exit relays no longer launch mock DNS requests to check for
3562 DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
3563 non-exit relays stopped servicing DNS requests. Fixes bug 965;
3564 bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
3565 - Bridges now report complete directory request statistics. Related
3566 to bug 5824; bugfix on 0.2.2.1-alpha.
3567 - Bridges now never collect statistics that were designed for
3568 relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
3569 - Stop giving annoying warning messages when we decide not to launch
3570 a pluggable transport proxy that we don't need (because there are
3571 no bridges configured to use it). Resolves ticket 5018; bugfix
3573 - Give the correct URL in the warning message when trying to run a
3574 relay on an ancient version of Windows. Fixes bug 9393.
3576 o Minor bugfixes (backtrace support):
3577 - Support automatic backtraces on more platforms by using the
3578 "-fasynchronous-unwind-tables" compiler option. This option is
3579 needed for platforms like 32-bit Intel where "-fomit-frame-pointer"
3580 is on by default and table generation is not. This doesn't yet
3581 add Windows support; only Linux, OSX, and some BSDs are affected.
3582 Reported by 'cypherpunks'; fixes bug 11047; bugfix on 0.2.5.2-alpha.
3583 - Avoid strange behavior if two threads hit failed assertions at the
3584 same time and both try to log backtraces at once. (Previously, if
3585 this had happened, both threads would have stored their intermediate
3586 results in the same buffer, and generated junk outputs.) Reported by
3587 "cypherpunks". Fixes bug 11048; bugfix on 0.2.5.2-alpha.
3588 - Fix a compiler warning in format_number_sigsafe(). Bugfix on
3589 0.2.5.2-alpha; patch from Nick Hopper.
3591 o Minor bugfixes (unit tests):
3592 - Fix a small bug in the unit tests that might have made the tests
3593 call 'chmod' with an uninitialized bitmask. Fixes bug 10928;
3594 bugfix on 0.2.5.1-alpha. Patch from Dana Koch.
3597 - Remove all remaining code related to version-0 hidden service
3598 descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
3599 the rest of bug 10841.
3602 - Document in the manpage that "KBytes" may also be written as
3603 "kilobytes" or "KB", that "Kbits" may also be written as
3604 "kilobits", and so forth. Closes ticket 9222.
3605 - Document that the ClientOnly config option overrides ORPort.
3606 Our old explanation made ClientOnly sound as though it did
3607 nothing at all. Resolves bug 9059.
3608 - Explain that SocksPolicy, DirPolicy, and similar options don't
3609 take port arguments. Fixes the other part of ticket 11108.
3610 - Fix a comment about the rend_server_descriptor_t.protocols field
3611 to more accurately describe its range. Also, make that field
3612 unsigned, to more accurately reflect its usage. Fixes bug 9099;
3613 bugfix on 0.2.1.5-alpha.
3614 - Fix the manpage's description of HiddenServiceAuthorizeClient:
3615 the maximum client name length is 16, not 19. Fixes bug 11118;
3616 bugfix on 0.2.1.6-alpha.
3618 o Code simplifications and refactoring:
3619 - Get rid of router->address, since in all cases it was just the
3620 string representation of router->addr. Resolves ticket 5528.
3622 o Test infrastructure:
3623 - Update to the latest version of tinytest.
3624 - Improve the tinytest implementation of string operation tests so
3625 that comparisons with NULL strings no longer crash the tests; they
3626 now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
3629 Changes in version 0.2.4.21 - 2014-02-28
3630 Tor 0.2.4.21 further improves security against potential adversaries who
3631 find breaking 1024-bit crypto doable, and backports several stability
3632 and robustness patches from the 0.2.5 branch.
3634 o Major features (client security):
3635 - When we choose a path for a 3-hop circuit, make sure it contains
3636 at least one relay that supports the NTor circuit extension
3637 handshake. Otherwise, there is a chance that we're building
3638 a circuit that's worth attacking by an adversary who finds
3639 breaking 1024-bit crypto doable, and that chance changes the game
3640 theory. Implements ticket 9777.
3643 - Do not treat streams that fail with reason
3644 END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
3645 since it could also indicate an ENETUNREACH connection error. Fixes
3646 part of bug 10777; bugfix on 0.2.4.8-alpha.
3648 o Code simplification and refactoring:
3649 - Remove data structures which were introduced to implement the
3650 CellStatistics option: they are now redundant with the new timestamp
3651 field in the regular packed_cell_t data structure, which we did
3652 in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
3655 - Always clear OpenSSL bignums before freeing them -- even bignums
3656 that don't contain secrets. Resolves ticket 10793. Patch by
3658 - Build without warnings under clang 3.4. (We have some macros that
3659 define static functions only some of which will get used later in
3660 the module. Starting with clang 3.4, these give a warning unless the
3661 unused attribute is set on them.) Resolves ticket 10904.
3662 - Update geoip and geoip6 files to the February 7 2014 Maxmind
3663 GeoLite2 Country database.
3666 - Set the listen() backlog limit to the largest actually supported
3667 on the system, not to the value in a header file. Fixes bug 9716;
3668 bugfix on every released Tor.
3669 - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
3670 exit node as a NOROUTE error, not an INTERNAL error, since they
3671 can apparently happen when trying to connect to the wrong sort
3672 of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
3673 - Fix build warnings about missing "a2x" comment when building the
3674 manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
3675 Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
3676 - Avoid a segfault on SIGUSR1, where we had freed a connection but did
3677 not entirely remove it from the connection lists. Fixes bug 9602;
3678 bugfix on 0.2.4.4-alpha.
3679 - Fix a segmentation fault in our benchmark code when running with
3680 Fedora's OpenSSL package, or any other OpenSSL that provides
3681 ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
3682 - Turn "circuit handshake stats since last time" log messages into a
3683 heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
3685 o Documentation fixes:
3686 - Document that all but one DirPort entry must have the NoAdvertise
3687 flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
3690 Changes in version 0.2.5.2-alpha - 2014-02-13
3691 Tor 0.2.5.2-alpha includes all the fixes from 0.2.4.18-rc and 0.2.4.20,
3692 like the "poor random number generation" fix and the "building too many
3693 circuits" fix. It also further improves security against potential
3694 adversaries who find breaking 1024-bit crypto doable, and launches
3695 pluggable transports on demand (which gets us closer to integrating
3696 pluggable transport support by default -- not to be confused with Tor
3697 bundles enabling pluggable transports and bridges by default).
3699 o Major features (client security):
3700 - When we choose a path for a 3-hop circuit, make sure it contains
3701 at least one relay that supports the NTor circuit extension
3702 handshake. Otherwise, there is a chance that we're building
3703 a circuit that's worth attacking by an adversary who finds
3704 breaking 1024-bit crypto doable, and that chance changes the game
3705 theory. Implements ticket 9777.
3706 - Clients now look at the "usecreatefast" consensus parameter to
3707 decide whether to use CREATE_FAST or CREATE cells for the first hop
3708 of their circuit. This approach can improve security on connections
3709 where Tor's circuit handshake is stronger than the available TLS
3710 connection security levels, but the tradeoff is more computational
3711 load on guard relays. Implements proposal 221. Resolves ticket 9386.
3713 o Major features (bridges):
3714 - Don't launch pluggable transport proxies if we don't have any
3715 bridges configured that would use them. Now we can list many
3716 pluggable transports, and Tor will dynamically start one when it
3717 hears a bridge address that needs it. Resolves ticket 5018.
3718 - The bridge directory authority now assigns status flags (Stable,
3719 Guard, etc) to bridges based on thresholds calculated over all
3720 Running bridges. Now bridgedb can finally make use of its features
3721 to e.g. include at least one Stable bridge in its answers. Fixes
3724 o Major features (other):
3725 - Extend ORCONN controller event to include an "ID" parameter,
3726 and add four new controller event types CONN_BW, CIRC_BW,
3727 CELL_STATS, and TB_EMPTY that show connection and circuit usage.
3728 The new events are emitted in private Tor networks only, with the
3729 goal of being able to better track performance and load during
3730 full-network simulations. Implements proposal 218 and ticket 7359.
3731 - On some platforms (currently: recent OSX versions, glibc-based
3732 platforms that support the ELF format, and a few other
3733 Unix-like operating systems), Tor can now dump stack traces
3734 when a crash occurs or an assertion fails. By default, traces
3735 are dumped to stderr (if possible) and to any logs that are
3736 reporting errors. Implements ticket 9299.
3739 - Avoid a segfault on SIGUSR1, where we had freed a connection but did
3740 not entirely remove it from the connection lists. Fixes bug 9602;
3741 bugfix on 0.2.4.4-alpha.
3742 - Do not treat streams that fail with reason
3743 END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
3744 since it could also indicate an ENETUNREACH connection error. Fixes
3745 part of bug 10777; bugfix on 0.2.4.8-alpha.
3747 o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
3748 - Do not allow OpenSSL engines to replace the PRNG, even when
3749 HardwareAccel is set. The only default builtin PRNG engine uses
3750 the Intel RDRAND instruction to replace the entire PRNG, and
3751 ignores all attempts to seed it with more entropy. That's
3752 cryptographically stupid: the right response to a new alleged
3753 entropy source is never to discard all previously used entropy
3754 sources. Fixes bug 10402; works around behavior introduced in
3755 OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
3757 - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
3758 address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
3759 - Avoid launching spurious extra circuits when a stream is pending.
3760 This fixes a bug where any circuit that _wasn't_ unusable for new
3761 streams would be treated as if it were, causing extra circuits to
3762 be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
3764 o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
3765 - No longer stop reading or writing on cpuworker connections when
3766 our rate limiting buckets go empty. Now we should handle circuit
3767 handshake requests more promptly. Resolves bug 9731.
3768 - Stop trying to bootstrap all our directory information from
3769 only our first guard. Discovered while fixing bug 9946; bugfix
3772 o Minor features (bridges, pluggable transports):
3773 - Add threshold cutoffs to the networkstatus document created by
3774 the Bridge Authority. Fixes bug 1117.
3775 - On Windows, spawn background processes using the CREATE_NO_WINDOW
3776 flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
3777 doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
3778 Vidalia set this option for us.) Implements ticket 10297.
3780 o Minor features (security):
3781 - Always clear OpenSSL bignums before freeing them -- even bignums
3782 that don't contain secrets. Resolves ticket 10793. Patch by
3785 o Minor features (config options and command line):
3786 - Add an --allow-missing-torrc commandline option that tells Tor to
3787 run even if the configuration file specified by -f is not available.
3788 Implements ticket 10060.
3789 - Add support for the TPROXY transparent proxying facility on Linux.
3790 See documentation for the new TransProxyType option for more
3791 details. Implementation by "thomo". Closes ticket 10582.
3793 o Minor features (controller):
3794 - Add a new "HS_DESC" controller event that reports activities
3795 related to hidden service descriptors. Resolves ticket 8510.
3796 - New "DROPGUARDS" controller command to forget all current entry
3797 guards. Not recommended for ordinary use, since replacing guards
3798 too frequently makes several attacks easier. Resolves ticket 9934;
3801 o Minor features (build):
3802 - Assume that a user using ./configure --host wants to cross-compile,
3803 and give an error if we cannot find a properly named
3804 tool-chain. Add a --disable-tool-name-check option to proceed
3805 nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
3806 - If we run ./configure and the compiler recognizes -fstack-protector
3807 but the linker rejects it, warn the user about a potentially missing
3808 libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
3810 o Minor features (testing):
3811 - If Python is installed, "make check" now runs extra tests beyond
3812 the unit test scripts.
3813 - When bootstrapping a test network, sometimes very few relays get
3814 the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
3815 specify a set of relays which should be voted Guard regardless of
3816 their uptime or bandwidth. Addresses ticket 9206.
3818 o Minor features (log messages):
3819 - When ServerTransportPlugin is set on a bridge, Tor can write more
3820 useful statistics about bridge use in its extrainfo descriptors,
3821 but only if the Extended ORPort ("ExtORPort") is set too. Add a
3822 log message to inform the user in this case. Resolves ticket 9651.
3823 - When receiving a new controller connection, log the origin address.
3824 Resolves ticket 9698; patch from "sigpipe".
3825 - When logging OpenSSL engine status at startup, log the status of
3826 more engines. Fixes ticket 10043; patch from Joshua Datko.
3827 - Turn "circuit handshake stats since last time" log messages into a
3828 heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
3830 o Minor features (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
3831 - Improve the circuit queue out-of-memory handler. Previously, when
3832 we ran low on memory, we'd close whichever circuits had the most
3833 queued cells. Now, we close those that have the *oldest* queued
3834 cells, on the theory that those are most responsible for us
3835 running low on memory. Based on analysis from a forthcoming paper
3836 by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
3837 - Generate bootstrapping status update events correctly when fetching
3838 microdescriptors. Fixes bug 9927.
3839 - Update to the October 2 2013 Maxmind GeoLite Country database.
3841 o Minor bugfixes (clients):
3842 - When closing a channel that has already been open, do not close
3843 pending circuits that were waiting to connect to the same relay.
3844 Fixes bug 9880; bugfix on 0.2.5.1-alpha. Thanks to skruffy for
3847 o Minor bugfixes (relays):
3848 - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
3849 exit node as a NOROUTE error, not an INTERNAL error, since they
3850 can apparently happen when trying to connect to the wrong sort
3851 of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
3853 o Minor bugfixes (bridges):
3854 - Fix a bug where the first connection works to a bridge that uses a
3855 pluggable transport with client-side parameters, but we don't send
3856 the client-side parameters on subsequent connections. (We don't
3857 use any pluggable transports with client-side parameters yet,
3858 but ScrambleSuit will soon become the first one.) Fixes bug 9162;
3859 bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
3861 o Minor bugfixes (node selection):
3862 - If ExcludeNodes is set, consider non-excluded hidden service
3863 directory servers before excluded ones. Do not consider excluded
3864 hidden service directory servers at all if StrictNodes is
3865 set. (Previously, we would sometimes decide to connect to those
3866 servers, and then realize before we initiated a connection that
3867 we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
3869 - If we set the ExitNodes option but it doesn't include any nodes
3870 that have the Exit flag, we would choose not to bootstrap. Now we
3871 bootstrap so long as ExitNodes includes nodes which can exit to
3872 some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
3874 o Minor bugfixes (controller and command-line):
3875 - If changing a config option via "setconf" fails in a recoverable
3876 way, we used to nonetheless write our new control ports to the
3877 file described by the "ControlPortWriteToFile" option. Now we only
3878 write out that file if we successfully switch to the new config
3879 option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
3880 - When a command-line option such as --version or --help that
3881 ordinarily implies --hush appears on the command line along with
3882 --quiet, then actually obey --quiet. Previously, we obeyed --quiet
3883 only if it appeared later on the command line. Fixes bug 9578;
3884 bugfix on 0.2.5.1-alpha.
3886 o Minor bugfixes (code correctness):
3887 - Previously we used two temporary files when writing descriptors to
3888 disk; now we only use one. Fixes bug 1376.
3889 - Remove an erroneous (but impossible and thus harmless) pointer
3890 comparison that would have allowed compilers to skip a bounds
3891 check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
3892 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
3893 - Fix an always-true assertion in pluggable transports code so it
3894 actually checks what it was trying to check. Fixes bug 10046;
3895 bugfix on 0.2.3.9-alpha. Found by "dcb".
3897 o Minor bugfixes (protocol correctness):
3898 - When receiving a VERSIONS cell with an odd number of bytes, close
3899 the connection immediately since the cell is malformed. Fixes bug
3900 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
3903 o Minor bugfixes (build):
3904 - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
3905 turned off (that is, without support for v2 link handshakes). Fixes
3906 bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
3907 - Fix compilation warnings and startup issues when running with
3908 "Sandbox 1" and libseccomp-2.1.0. Fixes bug 10563; bugfix on
3910 - Fix compilation on Solaris 9, which didn't like us having an
3911 identifier named "sun". Fixes bug 10565; bugfix in 0.2.5.1-alpha.
3913 o Minor bugfixes (testing):
3914 - Fix a segmentation fault in our benchmark code when running with
3915 Fedora's OpenSSL package, or any other OpenSSL that provides
3916 ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
3918 o Minor bugfixes (log messages):
3919 - Fix a bug where clients using bridges would report themselves
3920 as 50% bootstrapped even without a live consensus document.
3921 Fixes bug 9922; bugfix on 0.2.1.1-alpha.
3922 - Suppress a warning where, if there's only one directory authority
3923 in the network, we would complain that votes and signatures cannot
3924 be uploaded to other directory authorities. Fixes bug 10842;
3925 bugfix on 0.2.2.26-beta.
3926 - Report bootstrapping progress correctly when we're downloading
3927 microdescriptors. We had updated our "do we have enough microdescs
3928 to begin building circuits?" logic most recently in 0.2.4.10-alpha
3929 (see bug 5956), but we left the bootstrap status event logic at
3930 "how far through getting 1/4 of them are we?" Fixes bug 9958;
3931 bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
3933 o Minor bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
3934 - Avoid a crash bug when starting with a corrupted microdescriptor
3935 cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
3936 - If we fail to dump a previously cached microdescriptor to disk, avoid
3937 freeing duplicate data later on. Fixes bug 10423; bugfix on
3938 0.2.4.13-alpha. Spotted by "bobnomnom".
3940 o Minor bugfixes on 0.2.4.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
3941 - Correctly log long IPv6 exit policies, instead of truncating them
3942 or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
3943 - Our default TLS ecdhe groups were backwards: we meant to be using
3944 P224 for relays (for performance win) and P256 for bridges (since
3945 it is more common in the wild). Instead we had it backwards. After
3946 reconsideration, we decided that the default should be P256 on all
3947 hosts, since its security is probably better, and since P224 is
3948 reportedly used quite little in the wild. Found by "skruffy" on
3949 IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
3950 - Free directory authority certificate download statuses on exit
3951 rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
3953 o Minor bugfixes on 0.2.3.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
3954 - If the guard we choose first doesn't answer, we would try the
3955 second guard, but once we connected to the second guard we would
3956 abandon it and retry the first one, slowing down bootstrapping.
3957 The fix is to treat all our initially chosen guards as acceptable
3958 to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
3959 - Fix an assertion failure that would occur when disabling the
3960 ORPort setting on a running Tor process while accounting was
3961 enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
3962 - When examining the list of network interfaces to find our address,
3963 do not consider non-running or disabled network interfaces. Fixes
3964 bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
3965 - Avoid an off-by-one error when checking buffer boundaries when
3966 formatting the exit status of a pluggable transport helper.
3967 This is probably not an exploitable bug, but better safe than
3968 sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
3971 o Removed code and features:
3972 - Clients now reject any directory authority certificates lacking
3973 a dir-key-crosscert element. These have been included since
3974 0.2.1.9-alpha, so there's no real reason for them to be optional
3975 any longer. Completes proposal 157. Resolves ticket 10162.
3976 - Remove all code that existed to support the v2 directory system,
3977 since there are no longer any v2 directory authorities. Resolves
3979 - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
3980 options, which were used for designating authorities as "Hidden
3981 service authorities". There has been no use of hidden service
3982 authorities since 0.2.2.1-alpha, when we stopped uploading or
3983 downloading v0 hidden service descriptors. Fixes bug 10881; also
3984 part of a fix for bug 10841.
3986 o Code simplification and refactoring:
3987 - Remove some old fallback code designed to keep Tor clients working
3988 in a network with only two working relays. Elsewhere in the code we
3989 have long since stopped supporting such networks, so there wasn't
3990 much point in keeping it around. Addresses ticket 9926.
3991 - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
3992 bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
3993 - Remove data structures which were introduced to implement the
3994 CellStatistics option: they are now redundant with the addition
3995 of a timestamp to the regular packed_cell_t data structure, which
3996 we did in 0.2.4.18-rc in order to resolve ticket 9093. Implements
3999 o Documentation (man page) fixes:
4000 - Update manpage to describe some of the files you can expect to
4001 find in Tor's DataDirectory. Addresses ticket 9839.
4002 - Document that all but one DirPort entry must have the NoAdvertise
4003 flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
4005 o Documentation fixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
4006 - Clarify the usage and risks of setting the ContactInfo torrc line
4007 for your relay or bridge. Resolves ticket 9854.
4008 - Add anchors to the manpage so we can link to the html version of
4009 the documentation for specific options. Resolves ticket 9866.
4010 - Replace remaining references to DirServer in man page and
4011 log entries. Resolves ticket 10124.
4014 - Make the "tor-gencert" tool used by directory authority operators
4015 create 2048-bit signing keys by default (rather than 1024-bit, since
4016 1024-bit is uncomfortably small these days). Addresses ticket 10324.
4019 Changes in version 0.2.4.20 - 2013-12-22
4020 Tor 0.2.4.20 fixes potentially poor random number generation for users
4021 who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
4022 torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
4023 and 4) have no state file in their DataDirectory (as would happen on
4024 first start). Users who generated relay or hidden service identity
4025 keys in such a situation should discard them and generate new ones.
4027 This release also fixes a logic error that caused Tor clients to build
4028 many more preemptive circuits than they actually need.
4031 - Do not allow OpenSSL engines to replace the PRNG, even when
4032 HardwareAccel is set. The only default builtin PRNG engine uses
4033 the Intel RDRAND instruction to replace the entire PRNG, and
4034 ignores all attempts to seed it with more entropy. That's
4035 cryptographically stupid: the right response to a new alleged
4036 entropy source is never to discard all previously used entropy
4037 sources. Fixes bug 10402; works around behavior introduced in
4038 OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
4040 - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
4041 address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
4042 - Avoid launching spurious extra circuits when a stream is pending.
4043 This fixes a bug where any circuit that _wasn't_ unusable for new
4044 streams would be treated as if it were, causing extra circuits to
4045 be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
4048 - Avoid a crash bug when starting with a corrupted microdescriptor
4049 cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
4050 - If we fail to dump a previously cached microdescriptor to disk, avoid
4051 freeing duplicate data later on. Fixes bug 10423; bugfix on
4052 0.2.4.13-alpha. Spotted by "bobnomnom".
4055 Changes in version 0.2.4.19 - 2013-12-11
4056 The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
4057 (1986-2013). Aaron worked on diverse projects including helping to guide
4058 Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
4059 transparency to the U.S government's PACER documents, and contributing
4060 design and development for Tor and Tor2Web. Aaron was one of the latest
4061 martyrs in our collective fight for civil liberties and human rights,
4062 and his death is all the more painful because he was one of us.
4064 Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
4065 a new circuit handshake and link encryption that use ECC to provide
4066 better security and efficiency; makes relays better manage circuit
4067 creation requests; uses "directory guards" to reduce client enumeration
4068 risks; makes bridges collect and report statistics about the pluggable
4069 transports they support; cleans up and improves our geoip database;
4070 gets much closer to IPv6 support for clients, bridges, and relays; makes
4071 directory authorities use measured bandwidths rather than advertised
4072 ones when computing flags and thresholds; disables client-side DNS
4073 caching to reduce tracking risks; and fixes a big bug in bridge
4074 reachability testing. This release introduces two new design
4075 abstractions in the code: a new "channel" abstraction between circuits
4076 and or_connections to allow for implementing alternate relay-to-relay
4077 transports, and a new "circuitmux" abstraction storing the queue of
4078 circuits for a channel. The release also includes many stability,
4079 security, and privacy fixes.
4082 Changes in version 0.2.4.18-rc - 2013-11-16
4083 Tor 0.2.4.18-rc is the fourth release candidate for the Tor 0.2.4.x
4084 series. It takes a variety of fixes from the 0.2.5.x branch to improve
4085 stability, performance, and better handling of edge cases.
4088 - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
4089 Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
4090 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
4091 renegotiation from working with TLS 1.1 or 1.2, so we had disabled
4092 them to solve bug 6033.)
4095 - No longer stop reading or writing on cpuworker connections when
4096 our rate limiting buckets go empty. Now we should handle circuit
4097 handshake requests more promptly. Resolves bug 9731.
4098 - If we are unable to save a microdescriptor to the journal, do not
4099 drop it from memory and then reattempt downloading it. Fixes bug
4100 9645; bugfix on 0.2.2.6-alpha.
4101 - Stop trying to bootstrap all our directory information from
4102 only our first guard. Discovered while fixing bug 9946; bugfix
4104 - The new channel code sometimes lost track of in-progress circuits,
4105 causing long-running clients to stop building new circuits. The
4106 fix is to always call circuit_n_chan_done(chan, 0) from
4107 channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
4109 o Minor bugfixes (on 0.2.4.x):
4110 - Correctly log long IPv6 exit policies, instead of truncating them
4111 or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
4112 - Our default TLS ecdhe groups were backwards: we meant to be using
4113 P224 for relays (for performance win) and P256 for bridges (since
4114 it is more common in the wild). Instead we had it backwards. After
4115 reconsideration, we decided that the default should be P256 on all
4116 hosts, since its security is probably better, and since P224 is
4117 reportedly used quite little in the wild. Found by "skruffy" on
4118 IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
4119 - Free directory authority certificate download statuses on exit
4120 rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
4122 o Minor bugfixes (on 0.2.3.x and earlier):
4123 - If the guard we choose first doesn't answer, we would try the
4124 second guard, but once we connected to the second guard we would
4125 abandon it and retry the first one, slowing down bootstrapping.
4126 The fix is to treat all our initially chosen guards as acceptable
4127 to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
4128 - Fix an assertion failure that would occur when disabling the
4129 ORPort setting on a running Tor process while accounting was
4130 enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
4131 - When examining the list of network interfaces to find our address,
4132 do not consider non-running or disabled network interfaces. Fixes
4133 bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
4134 - Avoid an off-by-one error when checking buffer boundaries when
4135 formatting the exit status of a pluggable transport helper.
4136 This is probably not an exploitable bug, but better safe than
4137 sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
4140 o Minor features (protecting client timestamps):
4141 - Clients no longer send timestamps in their NETINFO cells. These were
4142 not used for anything, and they provided one small way for clients
4143 to be distinguished from each other as they moved from network to
4144 network or behind NAT. Implements part of proposal 222.
4145 - Clients now round timestamps in INTRODUCE cells down to the nearest
4146 10 minutes. If a new Support022HiddenServices option is set to 0, or
4147 if it's set to "auto" and the feature is disabled in the consensus,
4148 the timestamp is sent as 0 instead. Implements part of proposal 222.
4149 - Stop sending timestamps in AUTHENTICATE cells. This is not such
4150 a big deal from a security point of view, but it achieves no actual
4151 good purpose, and isn't needed. Implements part of proposal 222.
4152 - Reduce down accuracy of timestamps in hidden service descriptors.
4153 Implements part of proposal 222.
4155 o Minor features (other):
4156 - Improve the circuit queue out-of-memory handler. Previously, when
4157 we ran low on memory, we'd close whichever circuits had the most
4158 queued cells. Now, we close those that have the *oldest* queued
4159 cells, on the theory that those are most responsible for us
4160 running low on memory. Based on analysis from a forthcoming paper
4161 by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
4162 - Generate bootstrapping status update events correctly when fetching
4163 microdescriptors. Fixes bug 9927.
4164 - Update to the October 2 2013 Maxmind GeoLite Country database.
4166 o Documentation fixes:
4167 - Clarify the usage and risks of setting the ContactInfo torrc line
4168 for your relay or bridge. Resolves ticket 9854.
4169 - Add anchors to the manpage so we can link to the html version of
4170 the documentation for specific options. Resolves ticket 9866.
4171 - Replace remaining references to DirServer in man page and
4172 log entries. Resolves ticket 10124.
4175 Changes in version 0.2.5.1-alpha - 2013-10-02
4176 Tor 0.2.5.1-alpha introduces experimental support for syscall sandboxing
4177 on Linux, allows bridges that offer pluggable transports to report usage
4178 statistics, fixes many issues to make testing easier, and provides
4179 a pile of minor features and bugfixes that have been waiting for a
4180 release of the new branch.
4182 This is the first alpha release in a new series, so expect there to
4183 be bugs. Users who would rather test out a more stable branch should
4184 stay with 0.2.4.x for now.
4186 o Major features (security):
4187 - Use the seccomp2 syscall filtering facility on Linux to limit
4188 which system calls Tor can invoke. This is an experimental,
4189 Linux-only feature to provide defense-in-depth against unknown
4190 attacks. To try turning it on, set "Sandbox 1" in your torrc
4191 file. Please be ready to report bugs. We hope to add support
4192 for better sandboxing in the future, including more fine-grained
4193 filters, better division of responsibility, and support for more
4194 platforms. This work has been done by Cristian-Matei Toader for
4195 Google Summer of Code.
4196 - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
4197 Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
4198 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
4199 renegotiation from working with TLS 1.1 or 1.2, so we had disabled
4200 them to solve bug 6033.)
4202 o Major features (other):
4203 - Add support for passing arguments to managed pluggable transport
4204 proxies. Implements ticket 3594.
4205 - Bridges now track GeoIP information and the number of their users
4206 even when pluggable transports are in use, and report usage
4207 statistics in their extra-info descriptors. Resolves tickets 4773
4209 - Make testing Tor networks bootstrap better: lower directory fetch
4210 retry schedules and maximum interval without directory requests,
4211 and raise maximum download tries. Implements ticket 6752.
4212 - Add make target 'test-network' to run tests on a Chutney network.
4213 Implements ticket 8530.
4214 - The ntor handshake is now on-by-default, no matter what the
4215 directory authorities recommend. Implements ticket 8561.
4218 - Instead of writing destroy cells directly to outgoing connection
4219 buffers, queue them and intersperse them with other outgoing cells.
4220 This can prevent a set of resource starvation conditions where too
4221 many pending destroy cells prevent data cells from actually getting
4222 delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
4223 bugfix on 0.2.0.1-alpha.
4224 - If we are unable to save a microdescriptor to the journal, do not
4225 drop it from memory and then reattempt downloading it. Fixes bug
4226 9645; bugfix on 0.2.2.6-alpha.
4227 - The new channel code sometimes lost track of in-progress circuits,
4228 causing long-running clients to stop building new circuits. The
4229 fix is to always call circuit_n_chan_done(chan, 0) from
4230 channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
4233 - Tor now builds each source file in two modes: a mode that avoids
4234 exposing identifiers needlessly, and another mode that exposes
4235 more identifiers for testing. This lets the compiler do better at
4236 optimizing the production code, while enabling us to take more
4237 radical measures to let the unit tests test things.
4238 - The production builds no longer include functions used only in
4239 the unit tests; all functions exposed from a module only for
4240 unit-testing are now static in production builds.
4241 - Add an --enable-coverage configuration option to make the unit
4242 tests (and a new src/or/tor-cov target) to build with gcov test
4246 - We now have rudimentary function mocking support that our unit
4247 tests can use to test functions in isolation. Function mocking
4248 lets the tests temporarily replace a function's dependencies with
4249 stub functions, so that the tests can check the function without
4250 invoking the other functions it calls.
4251 - Add more unit tests for the <circid,channel>->circuit map, and
4252 the destroy-cell-tracking code to fix bug 7912.
4253 - Unit tests for failing cases of the TAP onion handshake.
4254 - More unit tests for address-manipulation functions.
4256 o Minor features (protecting client timestamps):
4257 - Clients no longer send timestamps in their NETINFO cells. These were
4258 not used for anything, and they provided one small way for clients
4259 to be distinguished from each other as they moved from network to
4260 network or behind NAT. Implements part of proposal 222.
4261 - Clients now round timestamps in INTRODUCE cells down to the nearest
4262 10 minutes. If a new Support022HiddenServices option is set to 0, or
4263 if it's set to "auto" and the feature is disabled in the consensus,
4264 the timestamp is sent as 0 instead. Implements part of proposal 222.
4265 - Stop sending timestamps in AUTHENTICATE cells. This is not such
4266 a big deal from a security point of view, but it achieves no actual
4267 good purpose, and isn't needed. Implements part of proposal 222.
4268 - Reduce down accuracy of timestamps in hidden service descriptors.
4269 Implements part of proposal 222.
4271 o Minor features (config options):
4272 - Config (torrc) lines now handle fingerprints which are missing
4273 their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
4274 - Support a --dump-config option to print some or all of the
4275 configured options. Mainly useful for debugging the command-line
4276 option parsing code. Helps resolve ticket 4647.
4277 - Raise awareness of safer logging: notify user of potentially
4278 unsafe config options, like logging more verbosely than severity
4279 "notice" or setting SafeLogging to 0. Resolves ticket 5584.
4280 - Add a new configuration option TestingV3AuthVotingStartOffset
4281 that bootstraps a network faster by changing the timing for
4282 consensus votes. Addresses ticket 8532.
4283 - Add a new torrc option "ServerTransportOptions" that allows
4284 bridge operators to pass configuration parameters to their
4285 pluggable transports. Resolves ticket 8929.
4286 - The config (torrc) file now accepts bandwidth and space limits in
4287 bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
4288 you can now say "16 kilobits", and so on.) Resolves ticket 9214.
4291 o Minor features (build):
4292 - Add support for `--library-versions` flag. Implements ticket 6384.
4293 - Return the "unexpected sendme" warnings to a warn severity, but make
4294 them rate limited, to help diagnose ticket 8093.
4295 - Detect a missing asciidoc, and warn the user about it, during
4296 configure rather than at build time. Fixes issue 6506. Patch from
4299 o Minor features (other):
4300 - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
4301 sockets in a single system call. Implements ticket 5129.
4302 - Log current accounting state (bytes sent and received + remaining
4303 time for the current accounting period) in the relay's heartbeat
4304 message. Implements ticket 5526; patch from Peter Retzlaff.
4305 - Implement the TRANSPORT_LAUNCHED control port event that
4306 notifies controllers about new launched pluggable
4307 transports. Resolves ticket 5609.
4308 - If we're using the pure-C 32-bit curve25519_donna implementation
4309 of curve25519, build it with the -fomit-frame-pointer option to
4310 make it go faster on register-starved hosts. This improves our
4311 handshake performance by about 6% on i386 hosts without nacl.
4313 - Update to the September 4 2013 Maxmind GeoLite Country database.
4316 - Set the listen() backlog limit to the largest actually supported
4317 on the system, not to the value in a header file. Fixes bug 9716;
4318 bugfix on every released Tor.
4319 - No longer accept malformed http headers when parsing urls from
4320 headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
4321 bugfix on 0.0.6pre1.
4322 - In munge_extrainfo_into_routerinfo(), check the return value of
4323 memchr(). This would have been a serious issue if we ever passed
4324 it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
4326 - On the chance that somebody manages to build Tor on a
4327 platform where time_t is unsigned, correct the way that
4328 microdesc_add_to_cache() handles negative time arguments.
4329 Fixes bug 8042; bugfix on 0.2.3.1-alpha.
4330 - Reject relative control socket paths and emit a warning. Previously,
4331 single-component control socket paths would be rejected, but Tor
4332 would not log why it could not validate the config. Fixes bug 9258;
4333 bugfix on 0.2.3.16-alpha.
4335 o Minor bugfixes (command line):
4336 - Use a single command-line parser for parsing torrc options on the
4337 command line and for finding special command-line options to avoid
4338 inconsistent behavior for torrc option arguments that have the same
4339 names as command-line options. Fixes bugs 4647 and 9578; bugfix on
4341 - No longer allow 'tor --hash-password' with no arguments. Fixes bug
4342 9573; bugfix on 0.0.9pre5.
4344 o Minor fixes (build, auxiliary programs):
4345 - Stop preprocessing the "torify" script with autoconf, since
4346 it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
4348 - The tor-fw-helper program now follows the standard convention and
4349 exits with status code "0" on success. Fixes bug 9030; bugfix on
4350 0.2.3.1-alpha. Patch by Arlo Breault.
4351 - Corrected ./configure advice for what openssl dev package you should
4352 install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
4354 o Minor code improvements:
4355 - Remove constants and tests for PKCS1 padding; it's insecure and
4356 shouldn't be used for anything new. Fixes bug 8792; patch
4358 - Remove instances of strcpy() from the unit tests. They weren't
4359 hurting anything, since they were only in the unit tests, but it's
4360 embarassing to have strcpy() in the code at all, and some analysis
4361 tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
4362 0.2.3.8-alpha. Patch from Arlo Breault.
4365 - Remove migration code from when we renamed the "cached-routers"
4366 file to "cached-descriptors" back in 0.2.0.8-alpha. This
4367 incidentally resolves ticket 6502 by cleaning up the related code
4368 a bit. Patch from Akshay Hebbar.
4370 o Code simplification and refactoring:
4371 - Extract the common duplicated code for creating a subdirectory
4372 of the data directory and writing to a file in it. Fixes ticket
4373 4282; patch from Peter Retzlaff.
4374 - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
4375 buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
4376 i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
4377 - Add a set of accessor functions for the circuit timeout data
4378 structure. Fixes ticket 6153; patch from "piet".
4379 - Clean up exit paths from connection_listener_new(). Closes ticket
4380 8789. Patch from Arlo Breault.
4381 - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
4382 and drop our own custom pkey_eq() implementation. Fixes bug 9043.
4383 - Use a doubly-linked list to implement the global circuit list.
4384 Resolves ticket 9108. Patch from Marek Majkowski.
4385 - Remove contrib/id_to_fp.c since it wasn't used anywhere.
4388 Changes in version 0.2.4.17-rc - 2013-09-05
4389 Tor 0.2.4.17-rc is the third release candidate for the Tor 0.2.4.x
4390 series. It adds an emergency step to help us tolerate the massive
4391 influx of users: 0.2.4 clients using the new (faster and safer) "NTor"
4392 circuit-level handshakes now effectively jump the queue compared to
4393 the 0.2.3 clients using "TAP" handshakes. This release also fixes a
4394 big bug hindering bridge reachability tests.
4397 - Relays now process the new "NTor" circuit-level handshake requests
4398 with higher priority than the old "TAP" circuit-level handshake
4399 requests. We still process some TAP requests to not totally starve
4400 0.2.3 clients when NTor becomes popular. A new consensus parameter
4401 "NumNTorsPerTAP" lets us tune the balance later if we need to.
4402 Implements ticket 9574.
4405 - If the circuit build timeout logic is disabled (via the consensus,
4406 or because we are an authority), then don't build testing circuits.
4407 Fixes bug 9657; bugfix on 0.2.2.14-alpha.
4408 - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
4409 previously they did not, which prevented them from receiving
4410 successful connections from relays for self-test or bandwidth
4411 testing. Also, when a relay is extending a circuit to a bridge,
4412 it needs to send a NETINFO cell, even when the bridge hasn't sent
4413 an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
4414 - If the time to download the next old-style networkstatus is in
4415 the future, do not decline to consider whether to download the
4416 next microdescriptor networkstatus. Fixes bug 9564; bugfix on
4420 - Avoid double-closing the listener socket in our socketpair()
4421 replacement (used on Windows) in the case where the addresses on
4422 our opened sockets don't match what we expected. Fixes bug 9400;
4423 bugfix on 0.0.2pre7. Found by Coverity.
4425 o Minor fixes (config options):
4426 - Avoid overflows when the user sets MaxCircuitDirtiness to a
4427 ridiculously high value, by imposing a (ridiculously high) 30-day
4428 maximum on MaxCircuitDirtiness.
4429 - Fix the documentation of HeartbeatPeriod to say that the heartbeat
4430 message is logged at notice, not at info.
4431 - Warn and fail if a server is configured not to advertise any
4432 ORPorts at all. (We need *something* to put in our descriptor,
4433 or we just won't work.)
4436 - Track how many "TAP" and "NTor" circuit handshake requests we get,
4437 and how many we complete, and log it every hour to help relay
4438 operators follow trends in network load. Addresses ticket 9658.
4439 - Update to the August 7 2013 Maxmind GeoLite Country database.
4442 Changes in version 0.2.4.16-rc - 2013-08-10
4443 Tor 0.2.4.16-rc is the second release candidate for the Tor 0.2.4.x
4444 series. It fixes several crash bugs in the 0.2.4 branch.
4447 - Fix a bug in the voting algorithm that could yield incorrect results
4448 when a non-naming authority declared too many flags. Fixes bug 9200;
4449 bugfix on 0.2.0.3-alpha.
4450 - Fix an uninitialized read that could in some cases lead to a remote
4451 crash while parsing INTRODUCE2 cells. Bugfix on 0.2.4.1-alpha.
4452 Anybody running a hidden service on the experimental 0.2.4.x
4453 branch should upgrade. (This is, so far as we know, unrelated to
4455 - Avoid an assertion failure when processing DNS replies without the
4456 answer types we expected. Fixes bug 9337; bugfix on 0.2.4.7-alpha.
4457 - Avoid a crash when using --hash-password. Fixes bug 9295; bugfix on
4458 0.2.4.15-rc. Found by stem integration tests.
4461 - Fix an invalid memory read that occured when a pluggable
4462 transport proxy failed its configuration protocol.
4463 Fixes bug 9288; bugfix on 0.2.4.1-alpha.
4464 - When evaluating whether to use a connection that we haven't
4465 decided is canonical using a recent link protocol version,
4466 decide that it's canonical only if it used address _does_
4467 match the desired address. Fixes bug 9309; bugfix on
4468 0.2.4.4-alpha. Reported by skruffy.
4469 - Make the default behavior of NumDirectoryGuards be to track
4470 NumEntryGuards. Now a user who changes only NumEntryGuards will get
4471 the behavior she expects. Fixes bug 9354; bugfix on 0.2.4.8-alpha.
4472 - Fix a spurious compilation warning with some older versions of
4473 GCC on FreeBSD. Fixes bug 9254; bugfix on 0.2.4.14-alpha.
4476 - Update to the July 3 2013 Maxmind GeoLite Country database.
4479 Changes in version 0.2.4.15-rc - 2013-07-01
4480 Tor 0.2.4.15-rc is the first release candidate for the Tor 0.2.4.x
4481 series. It fixes a few smaller bugs, but generally appears stable.
4482 Please test it and let us know whether it is!
4485 - When receiving a new configuration file via the control port's
4486 LOADCONF command, do not treat the defaults file as absent.
4487 Fixes bug 9122; bugfix on 0.2.3.9-alpha.
4490 - Issue a warning when running with the bufferevents backend enabled.
4491 It's still not stable, and people should know that they're likely
4492 to hit unexpected problems. Closes ticket 9147.
4495 Changes in version 0.2.4.14-alpha - 2013-06-18
4496 Tor 0.2.4.14-alpha fixes a pair of client guard enumeration problems
4497 present in 0.2.4.13-alpha.
4500 - When we have too much memory queued in circuits (according to a new
4501 MaxMemInCellQueues option), close the circuits consuming the most
4502 memory. This prevents us from running out of memory as a relay if
4503 circuits fill up faster than they can be drained. Fixes bug 9063;
4504 bugfix on the 54th commit of Tor. This bug is a further fix beyond
4505 bug 6252, whose fix was merged into 0.2.3.21-rc.
4507 This change also fixes an earlier approach taken in 0.2.4.13-alpha,
4508 where we tried to solve this issue simply by imposing an upper limit
4509 on the number of queued cells for a single circuit. That approach
4510 proved to be problematic, since there are ways to provoke clients to
4511 send a number of cells in excess of any such reasonable limit. Fixes
4512 bug 9072; bugfix on 0.2.4.13-alpha.
4514 - Limit hidden service descriptors to at most ten introduction
4515 points, to slow one kind of guard enumeration. Fixes bug 9002;
4516 bugfix on 0.1.1.11-alpha.
4519 Changes in version 0.2.4.13-alpha - 2013-06-14
4520 Tor 0.2.4.13-alpha fixes a variety of potential remote crash
4521 vulnerabilities, makes socks5 username/password circuit isolation
4522 actually actually work (this time for sure!), and cleans up a bunch
4523 of other issues in preparation for a release candidate.
4525 o Major bugfixes (robustness):
4526 - Close any circuit that has too many cells queued on it. Fixes
4527 bug 9063; bugfix on the 54th commit of Tor. This bug is a further
4528 fix beyond bug 6252, whose fix was merged into 0.2.3.21-rc.
4529 - Prevent the get_freelists() function from running off the end of
4530 the list of freelists if it somehow gets an unrecognized
4531 allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
4533 - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
4534 when an exit connection with optimistic data succeeds immediately
4535 rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
4537 - Fix a directory authority crash bug when building a consensus
4538 using an older consensus as its basis. Fixes bug 8833. Bugfix
4542 - Avoid a memory leak where we would leak a consensus body when we
4543 find that a consensus which we couldn't previously verify due to
4544 missing certificates is now verifiable. Fixes bug 8719; bugfix
4546 - We used to always request authority certificates by identity digest,
4547 meaning we'd get the newest one even when we wanted one with a
4548 different signing key. Then we would complain about being given
4549 a certificate we already had, and never get the one we really
4550 wanted. Now we use the "fp-sk/" resource as well as the "fp/"
4551 resource to request the one we want. Fixes bug 5595; bugfix on
4553 - Follow the socks5 protocol when offering username/password
4554 authentication. The fix for bug 8117 exposed this bug, and it
4555 turns out real-world applications like Pidgin do care. Bugfix on
4556 0.2.3.2-alpha; fixes bug 8879.
4557 - Prevent failures on Windows Vista and later when rebuilding the
4558 microdescriptor cache. Diagnosed by Robert Ransom. Fixes bug 8822;
4559 bugfix on 0.2.4.12-alpha.
4562 - Fix an impossible buffer overrun in the AES unit tests. Fixes
4563 bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
4564 - If for some reason we fail to write a microdescriptor while
4565 rebuilding the cache, do not let the annotations from that
4566 microdescriptor linger in the cache file, and do not let the
4567 microdescriptor stay recorded as present in its old location.
4568 Fixes bug 9047; bugfix on 0.2.2.6-alpha.
4569 - Fix a memory leak that would occur whenever a configuration
4570 option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
4571 - Paste the description for PathBias parameters from the man
4572 page into or.h, so the code documents them too. Fixes bug 7982;
4573 bugfix on 0.2.3.17-beta and 0.2.4.8-alpha.
4574 - Relays now treat a changed IPv6 ORPort as sufficient reason to
4575 publish an updated descriptor. Fixes bug 6026; bugfix on
4577 - When launching a resolve request on behalf of an AF_UNIX control
4578 socket, omit the address field of the new entry connection, used in
4579 subsequent controller events, rather than letting tor_dup_addr()
4580 set it to "<unknown address type>". Fixes bug 8639; bugfix on
4583 o Minor bugfixes (log messages):
4584 - Fix a scaling issue in the path bias accounting code that
4585 resulted in "Bug:" log messages from either
4586 pathbias_scale_close_rates() or pathbias_count_build_success().
4587 This represents a bugfix on a previous bugfix: the original fix
4588 attempted in 0.2.4.10-alpha was incomplete. Fixes bug 8235; bugfix
4590 - Give a less useless error message when the user asks for an IPv4
4591 address on an IPv6-only port, or vice versa. Fixes bug 8846; bugfix
4595 - Downgrade "unexpected SENDME" warnings to protocol-warn for 0.2.4.x,
4596 to tolerate bug 8093 for now.
4597 - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
4598 in directory authority votes to describe whether they have enough
4599 measured bandwidths to ignore advertised (relay descriptor)
4600 bandwidth claims. Resolves ticket 8711.
4601 - Update to the June 5 2013 Maxmind GeoLite Country database.
4603 o Removed documentation:
4604 - Remove some of the older contents of doc/ as obsolete; move others
4605 to torspec.git. Fixes bug 8965.
4607 o Code simplification and refactoring:
4608 - Avoid using character buffers when constructing most directory
4609 objects: this approach was unwieldy and error-prone. Instead,
4610 build smartlists of strings, and concatenate them when done.
4613 Changes in version 0.2.4.12-alpha - 2013-04-18
4614 Tor 0.2.4.12-alpha moves Tor forward on several fronts: it starts the
4615 process for lengthening the guard rotation period, makes directory
4616 authority opinions in the consensus a bit less gameable, makes socks5
4617 username/password circuit isolation actually work, and fixes a wide
4618 variety of other issues.
4621 - Raise the default time that a client keeps an entry guard from
4622 "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
4623 2012 paper. (We would make it even longer, but we need better client
4624 load balancing first.) Also, make the guard lifetime controllable
4625 via a new GuardLifetime torrc option and a GuardLifetime consensus
4626 parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
4627 - Directory authorities now prefer using measured bandwidths to
4628 advertised ones when computing flags and thresholds. Resolves
4630 - Directory authorities that have more than a threshold number
4631 of relays with measured bandwidths now treat relays with unmeasured
4632 bandwidths as having bandwidth 0. Resolves ticket 8435.
4634 o Major bugfixes (assert / resource use):
4635 - Avoid a bug where our response to TLS renegotiation under certain
4636 network conditions could lead to a busy-loop, with 100% CPU
4637 consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
4638 - Avoid an assertion when we discover that we'd like to write a cell
4639 onto a closing connection: just discard the cell. Fixes another
4640 case of bug 7350; bugfix on 0.2.4.4-alpha.
4642 o Major bugfixes (client-side privacy):
4643 - When we mark a circuit as unusable for new circuits, have it
4644 continue to be unusable for new circuits even if MaxCircuitDirtiness
4645 is increased too much at the wrong time, or the system clock jumps
4646 backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
4647 - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
4648 which have resolved to internal addresses") is set, apply that
4649 rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
4650 - When an exit relay rejects a stream with reason "exit policy", but
4651 we only know an exit policy summary (e.g. from the microdesc
4652 consensus) for it, do not mark the relay as useless for all exiting.
4653 Instead, mark just the circuit as unsuitable for that particular
4654 address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
4655 - Allow applications to get proper stream isolation with
4656 IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
4657 username/password authentication also offer "no authentication". Tor
4658 had previously preferred "no authentication", so the applications
4659 never actually sent Tor their auth details. Now Tor selects
4660 username/password authentication if it's offered. You can disable
4661 this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
4662 bug 8117; bugfix on 0.2.3.3-alpha.
4664 o Major bugfixes (other):
4665 - When unable to find any working directory nodes to use as a
4666 directory guard, give up rather than adding the same non-working
4667 nodes to the directory guard list over and over. Fixes bug 8231;
4668 bugfix on 0.2.4.8-alpha.
4671 - Reject as invalid most directory objects containing a NUL.
4672 Belt-and-suspender fix for bug 8037.
4673 - In our testsuite, create temporary directories with a bit more
4674 entropy in their name to make name collisions less likely. Fixes
4676 - Add CACHED keyword to ADDRMAP events in the control protocol
4677 to indicate whether a DNS result will be cached or not. Resolves
4679 - Update to the April 3 2013 Maxmind GeoLite Country database.
4681 o Minor features (build):
4682 - Detect and reject attempts to build Tor with threading support
4683 when OpenSSL has been compiled without threading support.
4685 - Clarify that when autoconf is checking for nacl, it is checking
4686 specifically for nacl with a fast curve25519 implementation.
4688 - Warn if building on a platform with an unsigned time_t: there
4689 are too many places where Tor currently assumes that time_t can
4690 hold negative values. We'd like to fix them all, but probably
4693 o Minor bugfixes (build):
4694 - Fix some bugs in tor-fw-helper-natpmp when trying to build and
4695 run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
4696 Fixes bug 7280; bugfix on 0.2.3.1-alpha.
4697 - Add the old src/or/micro-revision.i filename to CLEANFILES.
4698 On the off chance that somebody has one, it will go away as soon
4699 as they run "make clean". Fix for bug 7143; bugfix on 0.2.4.1-alpha.
4700 - Build Tor correctly on 32-bit platforms where the compiler can build
4701 but not run code using the "uint128_t" construction. Fixes bug 8587;
4702 bugfix on 0.2.4.8-alpha.
4703 - Fix compilation warning with some versions of clang that would
4704 prefer the -Wswitch-enum compiler flag to warn about switch
4705 statements with missing enum values, even if those switch
4706 statements have a "default:" statement. Fixes bug 8598; bugfix
4709 o Minor bugfixes (protocol):
4710 - Fix the handling of a TRUNCATE cell when it arrives while the
4711 circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
4712 - Fix a misframing issue when reading the version numbers in a
4713 VERSIONS cell. Previously we would recognize [00 01 00 02] as
4714 'version 1, version 2, and version 0x100', when it should have
4715 only included versions 1 and 2. Fixes bug 8059; bugfix on
4716 0.2.0.10-alpha. Reported pseudonymously.
4717 - Make the format and order of STREAM events for DNS lookups
4718 consistent among the various ways to launch DNS lookups. Fixes
4719 bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy."
4720 - Correct our check for which versions of Tor support the EXTEND2
4721 cell. We had been willing to send it to Tor 0.2.4.7-alpha and
4722 later, when support was really added in version 0.2.4.8-alpha.
4723 Fixes bug 8464; bugfix on 0.2.4.8-alpha.
4725 o Minor bugfixes (other):
4726 - Correctly store microdescriptors and extrainfo descriptors with
4727 an internal NUL byte. Fixes bug 8037; bugfix on 0.2.0.1-alpha.
4728 Bug reported by "cypherpunks".
4729 - Increase the width of the field used to remember a connection's
4730 link protocol version to two bytes. Harmless for now, since the
4731 only currently recognized versions are one byte long. Reported
4732 pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
4733 - If the state file's path bias counts are invalid (presumably from a
4734 buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
4735 additional checks and log messages to the scaling of Path Bias
4736 counts, in case there still are remaining issues with scaling.
4737 Should help resolve bug 8235.
4738 - Eliminate several instances where we use "Nickname=ID" to refer to
4739 nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
4740 "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
4741 on 0.2.3.21-rc, 0.2.4.5-alpha, 0.2.4.8-alpha, and 0.2.4.10-alpha.
4743 o Minor bugfixes (syscalls):
4744 - Always check the return values of functions fcntl() and
4745 setsockopt(). We don't believe these are ever actually failing in
4746 practice, but better safe than sorry. Also, checking these return
4747 values should please analysis tools like Coverity. Patch from
4748 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
4749 - Use direct writes rather than stdio when building microdescriptor
4750 caches, in an attempt to mitigate bug 8031, or at least make it
4753 o Minor bugfixes (config):
4754 - When rejecting a configuration because we were unable to parse a
4755 quoted string, log an actual error message. Fixes bug 7950; bugfix
4757 - Behave correctly when the user disables LearnCircuitBuildTimeout
4758 but doesn't tell us what they would like the timeout to be. Fixes
4759 bug 6304; bugfix on 0.2.2.14-alpha.
4760 - When autodetecting the number of CPUs, use the number of available
4761 CPUs in preference to the number of configured CPUs. Inform the
4762 user if this reduces the number of available CPUs. Fixes bug 8002;
4763 bugfix on 0.2.3.1-alpha.
4764 - Make it an error when you set EntryNodes but disable UseGuardNodes,
4765 since it will (surprisingly to some users) ignore EntryNodes. Fixes
4766 bug 8180; bugfix on 0.2.3.11-alpha.
4767 - Allow TestingTorNetworks to override the 4096-byte minimum for
4768 the Fast threshold. Otherwise they can't bootstrap until they've
4769 observed more traffic. Fixes bug 8508; bugfix on 0.2.4.10-alpha.
4770 - Fix some logic errors when the user manually overrides the
4771 PathsNeededToBuildCircuits option in torrc. Fixes bug 8599; bugfix
4774 o Minor bugfixes (log messages to help diagnose bugs):
4775 - If we fail to free a microdescriptor because of bug 7164, log
4776 the filename and line number from which we tried to free it.
4777 - Add another diagnostic to the heartbeat message: track and log
4778 overhead that TLS is adding to the data we write. If this is
4779 high, we are sending too little data to SSL_write at a time.
4780 Diagnostic for bug 7707.
4781 - Add more detail to a log message about relaxed timeouts, to help
4783 - Warn more aggressively when flushing microdescriptors to a
4784 microdescriptor cache fails, in an attempt to mitigate bug 8031,
4785 or at least make it more diagnosable.
4786 - Improve debugging output to help track down bug 8185 ("Bug:
4787 outgoing relay cell has n_chan==NULL. Dropping.")
4788 - Log the purpose of a path-bias testing circuit correctly.
4789 Improves a log message from bug 8477; bugfix on 0.2.4.8-alpha.
4791 o Minor bugfixes (0.2.4.x log messages that were too noisy):
4792 - Don't attempt to relax the timeout of already opened 1-hop circuits.
4793 They might never timeout. This should eliminate some/all cases of
4794 the relaxed timeout log message.
4795 - Use circuit creation time for network liveness evaluation. This
4796 should eliminate warning log messages about liveness caused
4797 by changes in timeout evaluation. Fixes bug 6572; bugfix on
4799 - Reduce a path bias length check from notice to info. The message
4800 is triggered when creating controller circuits. Fixes bug 8196;
4801 bugfix on 0.2.4.8-alpha.
4802 - Fix a path state issue that triggered a notice during relay startup.
4803 Fixes bug 8320; bugfix on 0.2.4.10-alpha.
4804 - Reduce occurrences of warns about circuit purpose in
4805 connection_ap_expire_building(). Fixes bug 8477; bugfix on
4808 o Minor bugfixes (pre-0.2.4.x log messages that were too noisy):
4809 - If we encounter a write failure on a SOCKS connection before we
4810 finish our SOCKS handshake, don't warn that we closed the
4811 connection before we could send a SOCKS reply. Fixes bug 8427;
4812 bugfix on 0.1.0.1-rc.
4813 - Correctly recognize that [::1] is a loopback address. Fixes
4814 bug 8377; bugfix on 0.2.1.3-alpha.
4815 - Fix a directory authority warn caused when we have a large amount
4816 of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
4817 - Don't log inappropriate heartbeat messages when hibernating: a
4818 hibernating node is _expected_ to drop out of the consensus,
4819 decide it isn't bootstrapped, and so forth. Fixes bug 7302;
4820 bugfix on 0.2.3.1-alpha.
4821 - Don't complain about bootstrapping problems while hibernating.
4822 These complaints reflect a general code problem, but not one
4823 with any problematic effects (no connections are actually
4824 opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
4826 o Documentation fixes:
4827 - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
4828 names match. Fixes bug 7768.
4829 - Make the torify manpage no longer refer to tsocks; torify hasn't
4830 supported tsocks since 0.2.3.14-alpha.
4831 - Make the tor manpage no longer reference tsocks.
4832 - Fix the GeoIPExcludeUnknown documentation to refer to
4833 ExcludeExitNodes rather than the currently nonexistent
4834 ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
4837 - The tor-tsocks.conf is no longer distributed or installed. We
4838 recommend that tsocks users use torsocks instead. Resolves
4842 Changes in version 0.2.4.11-alpha - 2013-03-11
4843 Tor 0.2.4.11-alpha makes relay measurement by directory authorities
4844 more robust, makes hidden service authentication work again, and
4845 resolves a DPI fingerprint for Tor's SSL transport.
4847 o Major features (directory authorities):
4848 - Directory authorities now support a new consensus method (17)
4849 where they cap the published bandwidth of servers for which
4850 insufficient bandwidth measurements exist. Fixes part of bug 2286.
4851 - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
4852 serve any v2 directory information. Now we can test disabling the
4853 old deprecated v2 directory format, and see whether doing so has
4854 any effect on network load. Begins to fix bug 6783.
4855 - Directory authorities now include inside each vote a statement of
4856 the performance thresholds they used when assigning flags.
4857 Implements ticket 8151.
4859 o Major bugfixes (directory authorities):
4860 - Stop marking every relay as having been down for one hour every
4861 time we restart a directory authority. These artificial downtimes
4862 were messing with our Stable and Guard flag calculations. Fixes
4863 bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
4865 o Major bugfixes (hidden services):
4866 - Allow hidden service authentication to succeed again. When we
4867 refactored the hidden service introduction code back
4868 in 0.2.4.1-alpha, we didn't update the code that checks
4869 whether authentication information is present, causing all
4870 authentication checks to return "false". Fix for bug 8207; bugfix
4871 on 0.2.4.1-alpha. Found by Coverity; this is CID 718615.
4873 o Minor features (relays, bridges):
4874 - Make bridge relays check once a minute for whether their IP
4875 address has changed, rather than only every 15 minutes. Resolves
4877 - Refactor resolve_my_address() so it returns the method by which we
4878 decided our public IP address (explicitly configured, resolved from
4879 explicit hostname, guessed from interfaces, learned by gethostname).
4880 Now we can provide more helpful log messages when a relay guesses
4881 its IP address incorrectly (e.g. due to unexpected lines in
4882 /etc/hosts). Resolves ticket 2267.
4883 - Teach bridge-using clients to avoid 0.2.2 bridges when making
4884 microdescriptor-related dir requests, and only fall back to normal
4885 descriptors if none of their bridges can handle microdescriptors
4886 (as opposed to the fix in ticket 4013, which caused them to fall
4887 back to normal descriptors if *any* of their bridges preferred
4888 them). Resolves ticket 4994.
4889 - Randomize the lifetime of our SSL link certificate, so censors can't
4890 use the static value for filtering Tor flows. Resolves ticket 8443;
4891 related to ticket 4014 which was included in 0.2.2.33.
4892 - Support a new version of the link protocol that allows 4-byte circuit
4893 IDs. Previously, circuit IDs were limited to 2 bytes, which presented
4894 a possible resource exhaustion issue. Closes ticket 7351; implements
4897 o Minor features (portability):
4898 - Tweak the curve25519-donna*.c implementations to tolerate systems
4899 that lack stdint.h. Fixes bug 3894; bugfix on 0.2.4.8-alpha.
4900 - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
4901 the signs of types during autoconf. This is better than our old
4902 approach, which didn't work when cross-compiling.
4903 - Detect the sign of enum values, rather than assuming that MSC is the
4904 only compiler where enum types are all signed. Fixes bug 7727;
4905 bugfix on 0.2.4.10-alpha.
4907 o Minor features (other):
4908 - Say "KBytes" rather than "KB" in the man page (for various values
4909 of K), to further reduce confusion about whether Tor counts in
4910 units of memory or fractions of units of memory. Resolves ticket 7054.
4911 - Clear the high bit on curve25519 public keys before passing them to
4912 our backend, in case we ever wind up using a backend that doesn't do
4913 so itself. If we used such a backend, and *didn't* clear the high bit,
4914 we could wind up in a situation where users with such backends would
4915 be distinguishable from users without. Fixes bug 8121; bugfix on
4917 - Update to the March 6 2013 Maxmind GeoLite Country database.
4919 o Minor bugfixes (clients):
4920 - When we receive a RELAY_END cell with the reason DONE, or with no
4921 reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
4922 status as "connection refused". Previously we reported these cases
4923 as success but then immediately closed the connection. Fixes bug
4924 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
4925 - Downgrade an assertion in connection_ap_expire_beginning to an
4926 LD_BUG message. The fix for bug 8024 should prevent this message
4927 from displaying, but just in case, a warn that we can diagnose
4928 is better than more assert crashes. Fixes bug 8065; bugfix on
4930 - Lower path use bias thresholds to .80 for notice and .60 for warn.
4931 Also make the rate limiting flags for the path use bias log messages
4932 independent from the original path bias flags. Fixes bug 8161;
4933 bugfix on 0.2.4.10-alpha.
4935 o Minor bugfixes (relays):
4936 - Stop trying to resolve our hostname so often (e.g. every time we
4937 think about doing a directory fetch). Now we reuse the cached
4938 answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
4939 and 2410 (bugfix on 0.1.2.2-alpha).
4940 - Stop sending a stray "(null)" in some cases for the server status
4941 "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
4943 - When choosing which stream on a formerly stalled circuit to wake
4944 first, make better use of the platform's weak RNG. Previously,
4945 we had been using the % ("modulo") operator to try to generate a
4946 1/N chance of picking each stream, but this behaves badly with
4947 many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
4949 - Use our own weak RNG when we need a weak RNG. Windows's rand() and
4950 Irix's random() only return 15 bits; Solaris's random() returns more
4951 bits but its RAND_MAX says it only returns 15, and so on. Motivated
4952 by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
4954 o Minor bugfixes (directory authorities):
4955 - Directory authorities now use less space when formatting identical
4956 microdescriptor lines in directory votes. Fixes bug 8158; bugfix
4959 o Minor bugfixes (memory leaks spotted by Coverity -- bug 7816):
4960 - Avoid leaking memory if we fail to compute a consensus signature
4961 or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
4962 - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
4964 - Fix a memory leak during safe-cookie controller authentication.
4965 Bugfix on 0.2.3.13-alpha.
4966 - Avoid memory leak of IPv6 policy content if we fail to format it into
4967 a router descriptor. Bugfix on 0.2.4.7-alpha.
4969 o Minor bugfixes (other code correctness issues):
4970 - Avoid a crash if we fail to generate an extrainfo descriptor.
4971 Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
4973 - When detecting the largest possible file descriptor (in order to
4974 close all file descriptors when launching a new program), actually
4975 use _SC_OPEN_MAX. The old code for doing this was very, very broken.
4976 Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
4978 - Fix a copy-and-paste error when adding a missing A1 to a routerset
4979 because of GeoIPExcludeUnknown. Fix for Coverity CID 980650.
4980 Bugfix on 0.2.4.10-alpha.
4981 - Fix an impossible-to-trigger integer overflow when estimating how
4982 long our onionskin queue would take. (This overflow would require us
4983 to accept 4 million onionskins before processing 100 of them.) Fixes
4984 bug 8210; bugfix on 0.2.4.10-alpha.
4986 o Code simplification and refactoring:
4987 - Add a wrapper function for the common "log a message with a
4991 Changes in version 0.2.4.10-alpha - 2013-02-04
4992 Tor 0.2.4.10-alpha adds defenses at the directory authority level from
4993 certain attacks that flood the network with relays; changes the queue
4994 for circuit create requests from a sized-based limit to a time-based
4995 limit; resumes building with MSVC on Windows; and fixes a wide variety
4998 o Major bugfixes (directory authority):
4999 - When computing directory thresholds, ignore any rejected-as-sybil
5000 nodes during the computation so that they can't influence Fast,
5001 Guard, etc. (We should have done this for proposal 109.) Fixes
5003 - When marking a node as a likely sybil, reset its uptime metrics
5004 to zero, so that it cannot time towards getting marked as Guard,
5005 Stable, or HSDir. (We should have done this for proposal 109.) Fixes
5009 - When a TLS write is partially successful but incomplete, remember
5010 that the flushed part has been flushed, and notice that bytes were
5011 actually written. Reported and fixed pseudonymously. Fixes bug
5012 7708; bugfix on Tor 0.1.0.5-rc.
5013 - Reject bogus create and relay cells with 0 circuit ID or 0 stream
5014 ID: these could be used to create unexpected streams and circuits
5015 which would count as "present" to some parts of Tor but "absent"
5016 to others, leading to zombie circuits and streams or to a bandwidth
5017 denial-of-service. Fixes bug 7889; bugfix on every released version
5018 of Tor. Reported by "oftc_must_be_destroyed".
5019 - Rename all macros in our local copy of queue.h to begin with "TOR_".
5020 This change seems the only good way to permanently prevent conflicts
5021 with queue.h on various operating systems. Fixes bug 8107; bugfix
5024 o Major features (relay):
5025 - Instead of limiting the number of queued onionskins (aka circuit
5026 create requests) to a fixed, hard-to-configure number, we limit
5027 the size of the queue based on how many we expect to be able to
5028 process in a given amount of time. We estimate the time it will
5029 take to process an onionskin based on average processing time
5030 of previous onionskins. Closes ticket 7291. You'll never have to
5031 configure MaxOnionsPending again.
5033 o Major features (portability):
5034 - Resume building correctly with MSVC and Makefile.nmake. This patch
5035 resolves numerous bugs and fixes reported by ultramage, including
5036 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
5037 - Make the ntor and curve25519 code build correctly with MSVC.
5038 Fix on 0.2.4.8-alpha.
5041 - When directory authorities are computing thresholds for flags,
5042 never let the threshold for the Fast flag fall below 4096
5043 bytes. Also, do not consider nodes with extremely low bandwidths
5044 when deciding thresholds for various directory flags. This change
5045 should raise our threshold for Fast relays, possibly in turn
5046 improving overall network performance; see ticket 1854. Resolves
5048 - The Tor client now ignores sub-domain components of a .onion
5049 address. This change makes HTTP "virtual" hosting
5050 possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
5051 http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
5052 hosted on the same hidden service. Implements proposal 204.
5053 - We compute the overhead from passing onionskins back and forth to
5054 cpuworkers, and report it when dumping statistics in response to
5055 SIGUSR1. Supports ticket 7291.
5057 o Minor features (path selection):
5058 - When deciding whether we have enough descriptors to build circuits,
5059 instead of looking at raw relay counts, look at which fraction
5060 of (bandwidth-weighted) paths we're able to build. This approach
5061 keeps clients from building circuits if their paths are likely to
5062 stand out statistically. The default fraction of paths needed is
5063 taken from the consensus directory; you can override it with the
5064 new PathsNeededToBuildCircuits option. Fixes ticket 5956.
5065 - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
5066 and we have GeoIP information, also exclude all nodes with unknown
5067 countries "??" and "A1". This behavior is controlled by the
5068 new GeoIPExcludeUnknown option: you can make such nodes always
5069 excluded with "GeoIPExcludeUnknown 1", and disable the feature
5070 with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
5071 gets you the default behavior. Implements feature 7706.
5072 - Path Use Bias: Perform separate accounting for successful circuit
5073 use. Keep separate statistics on stream attempt rates versus stream
5074 success rates for each guard. Provide configurable thresholds to
5075 determine when to emit log messages or disable use of guards that
5076 fail too many stream attempts. Resolves ticket 7802.
5078 o Minor features (log messages):
5079 - When learning a fingerprint for a bridge, log its corresponding
5080 transport type. Implements ticket 7896.
5081 - Improve the log message when "Bug/attack: unexpected sendme cell
5082 from client" occurs, to help us track bug 8093.
5085 - Remove a couple of extraneous semicolons that were upsetting the
5086 cparser library. Patch by Christian Grothoff. Fixes bug 7115;
5087 bugfix on 0.2.2.1-alpha.
5088 - Remove a source of rounding error during path bias count scaling;
5089 don't count cannibalized circuits as used for path bias until we
5090 actually try to use them; and fix a circuit_package_relay_cell()
5091 warning message about n_chan==NULL. Fixes bug 7802.
5092 - Detect nacl when its headers are in a nacl/ subdirectory. Also,
5093 actually link against nacl when we're configured to use it. Fixes
5094 bug 7972; bugfix on 0.2.4.8-alpha.
5095 - Compile correctly with the --disable-curve25519 option. Fixes
5096 bug 8153; bugfix on 0.2.4.8-alpha.
5098 o Build improvements:
5099 - Do not report status verbosely from autogen.sh unless the -v flag
5100 is specified. Fixes issue 4664. Patch from Onizuka.
5101 - Replace all calls to snprintf() outside of src/ext with
5102 tor_snprintf(). Also remove the #define to replace snprintf with
5103 _snprintf on Windows; they have different semantics, and all of
5104 our callers should be using tor_snprintf() anyway. Fixes bug 7304.
5105 - Try to detect if we are ever building on a platform where
5106 memset(...,0,...) does not set the value of a double to 0.0. Such
5107 platforms are permitted by the C standard, though in practice
5108 they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
5109 currently support them, but it's better to detect them and fail
5110 than to perform erroneously.
5113 - Stop exporting estimates of v2 and v3 directory traffic shares
5114 in extrainfo documents. They were unneeded and sometimes inaccurate.
5115 Also stop exporting any v2 directory request statistics. Resolves
5117 - Drop support for detecting and warning about versions of Libevent
5118 before 1.3e. Nothing reasonable ships with them any longer;
5119 warning the user about them shouldn't be needed. Resolves ticket
5122 o Code simplifications and refactoring:
5123 - Rename "isin" functions to "contains", for grammar. Resolves
5125 - Rename Tor's logging function log() to tor_log(), to avoid conflicts
5126 with the natural logarithm function from the system libm. Resolves
5130 Changes in version 0.2.4.9-alpha - 2013-01-15
5131 Tor 0.2.4.9-alpha provides a quick fix to make the new ntor handshake
5135 - Fix backward compatibility logic when receiving an embedded ntor
5136 handshake tunneled in a CREATE cell. This clears up the "Bug:
5137 couldn't format CREATED cell" warning. Fixes bug 7959; bugfix
5141 Changes in version 0.2.4.8-alpha - 2013-01-14
5142 Tor 0.2.4.8-alpha introduces directory guards to reduce user enumeration
5143 risks, adds a new stronger and faster circuit handshake, and offers
5144 stronger and faster link encryption when both sides support it.
5147 - Preliminary support for directory guards (proposal 207): when
5148 possible, clients now use their entry guards for non-anonymous
5149 directory requests. This can help prevent client enumeration. Note
5150 that this behavior only works when we have a usable consensus
5151 directory, and when options about what to download are more or less
5152 standard. In the future we should re-bootstrap from our guards,
5153 rather than re-bootstrapping from the preconfigured list of
5154 directory sources that ships with Tor. Resolves ticket 6526.
5155 - Tor relays and clients now support a better CREATE/EXTEND cell
5156 format, allowing the sender to specify multiple address, identity,
5157 and handshake types. Implements Robert Ransom's proposal 200;
5160 o Major features (new circuit handshake):
5161 - Tor now supports a new circuit extension handshake designed by Ian
5162 Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
5163 circuit extension handshake, later called "TAP", was a bit slow
5164 (especially on the relay side), had a fragile security proof, and
5165 used weaker keys than we'd now prefer. The new circuit handshake
5166 uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
5167 function, making it significantly more secure than the older
5168 handshake, and significantly faster. Tor can use one of two built-in
5169 pure-C curve25519-donna implementations by Adam Langley, or it
5170 can link against the "nacl" library for a tuned version if present.
5172 The built-in version is very fast for 64-bit systems when building
5173 with GCC. The built-in 32-bit version is still faster than the
5174 old TAP protocol, but using libnacl is better on most such hosts.
5176 Clients don't currently use this protocol by default, since
5177 comparatively few clients support it so far. To try it, set
5178 UseNTorHandshake to 1.
5180 Implements proposal 216; closes ticket 7202.
5182 o Major features (better link encryption):
5183 - Relays can now enable the ECDHE TLS ciphersuites when available
5184 and appropriate. These ciphersuites let us negotiate forward-secure
5185 TLS secret keys more safely and more efficiently than with our
5186 previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
5187 public relays prefer the (faster) P224 group, and bridges prefer
5188 the (more common) P256 group; you can override this with the
5191 Enabling these ciphers was a little tricky, since for a long time,
5192 clients had been claiming to support them without actually doing
5193 so, in order to foil fingerprinting. But with the client-side
5194 implementation of proposal 198 in 0.2.3.17-beta, clients can now
5195 match the ciphers from recent Firefox versions *and* list the
5196 ciphers they actually mean, so relays can believe such clients
5197 when they advertise ECDHE support in their TLS ClientHello messages.
5199 This feature requires clients running 0.2.3.17-beta or later,
5200 and requires both sides to be running OpenSSL 1.0.0 or later
5201 with ECC support. OpenSSL 1.0.1, with the compile-time option
5202 "enable-ec_nistp_64_gcc_128", is highly recommended.
5204 Implements the relay side of proposal 198; closes ticket 7200.
5207 - Avoid crashing when, as a relay without IPv6-exit support, a
5208 client insists on getting an IPv6 address or nothing. Fixes bug
5209 7814; bugfix on 0.2.4.7-alpha.
5212 - Improve circuit build timeout handling for hidden services.
5213 In particular: adjust build timeouts more accurately depending
5214 upon the number of hop-RTTs that a particular circuit type
5215 undergoes. Additionally, launch intro circuits in parallel
5216 if they timeout, and take the first one to reply as valid.
5217 - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
5218 separate error codes; or at least, don't break for that reason.
5219 Fixes bug 7935. Reported by "oftc_must_be_destroyed".
5220 - Update to the January 2 2013 Maxmind GeoLite Country database.
5222 o Minor features (testing):
5223 - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
5224 (P-256) Diffie-Hellman handshakes to src/or/bench.
5225 - Add benchmark functions to test onion handshake performance.
5227 o Minor features (path bias detection):
5228 - Alter the Path Bias log messages to be more descriptive in terms
5229 of reporting timeouts and other statistics.
5230 - Create three levels of Path Bias log messages, as opposed to just
5231 two. These are configurable via consensus as well as via the torrc
5232 options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
5233 The default values are 0.70, 0.50, and 0.30 respectively.
5234 - Separate the log message levels from the decision to drop guards,
5235 which also is available via torrc option PathBiasDropGuards.
5236 PathBiasDropGuards still defaults to 0 (off).
5237 - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
5238 in combination with PathBiasExtremeRate.
5239 - Increase the default values for PathBiasScaleThreshold and
5240 PathBiasCircThreshold from (200, 20) to (300, 150).
5241 - Add in circuit usage accounting to path bias. If we try to use a
5242 built circuit but fail for any reason, it counts as path bias.
5243 Certain classes of circuits where the adversary gets to pick your
5244 destination node are exempt from this accounting. Usage accounting
5245 can be specifically disabled via consensus parameter or torrc.
5246 - Convert all internal path bias state to double-precision floating
5247 point, to avoid roundoff error and other issues.
5248 - Only record path bias information for circuits that have completed
5249 *two* hops. Assuming end-to-end tagging is the attack vector, this
5250 makes us more resilient to ambient circuit failure without any
5251 detection capability loss.
5253 o Minor bugfixes (log messages):
5254 - Rate-limit the "No circuits are opened. Relaxed timeout for a
5255 circuit with channel state open..." message to once per hour to
5256 keep it from filling the notice logs. Mitigates bug 7799 but does
5257 not fix the underlying cause. Bugfix on 0.2.4.7-alpha.
5258 - Avoid spurious warnings when configuring multiple client ports of
5259 which only some are nonlocal. Previously, we had claimed that some
5260 were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
5263 o Code simplifications and refactoring:
5264 - Get rid of a couple of harmless clang warnings, where we compared
5265 enums to ints. These warnings are newly introduced in clang 3.2.
5266 - Split the onion.c file into separate modules for the onion queue
5267 and the different handshakes it supports.
5268 - Remove the marshalling/unmarshalling code for sending requests to
5269 cpuworkers over a socket, and instead just send structs. The
5270 recipient will always be the same Tor binary as the sender, so
5271 any encoding is overkill.
5274 Changes in version 0.2.4.7-alpha - 2012-12-24
5275 Tor 0.2.4.7-alpha introduces a new approach to providing fallback
5276 directory mirrors for more robust bootstrapping; fixes more issues where
5277 clients with changing network conditions refuse to make any circuits;
5278 adds initial support for exiting to IPv6 addresses; resumes being able
5279 to update our GeoIP database, and includes the geoip6 file this time;
5280 turns off the client-side DNS cache by default due to privacy risks;
5281 and fixes a variety of other issues.
5283 o Major features (client resilience):
5284 - Add a new "FallbackDir" torrc option to use when we can't use
5285 a directory mirror from the consensus (either because we lack a
5286 consensus, or because they're all down). Currently, all authorities
5287 are fallbacks by default, and there are no other default fallbacks,
5288 but that will change. This option will allow us to give clients a
5289 longer list of servers to try to get a consensus from when first
5290 connecting to the Tor network, and thereby reduce load on the
5291 directory authorities. Implements proposal 206, "Preconfigured
5292 directory sources for bootstrapping". We also removed the old
5293 "FallbackNetworkstatus" option, since we never got it working well
5294 enough to use it. Closes bug 572.
5295 - If we have no circuits open, use a relaxed timeout (the
5296 95-percentile cutoff) until a circuit succeeds. This heuristic
5297 should allow Tor to succeed at building circuits even when the
5298 network connection drastically changes. Should help with bug 3443.
5300 o Major features (IPv6):
5301 - Relays can now exit to IPv6 addresses: make sure that you have IPv6
5302 connectivity, then set the IPv6Exit flag to 1. Also make sure your
5303 exit policy reads as you would like: the address * applies to all
5304 address families, whereas *4 is IPv4 address only, and *6 is IPv6
5305 addresses only. On the client side, you'll need to wait until the
5306 authorities have upgraded, wait for enough exits to support IPv6,
5307 apply the "IPv6Traffic" flag to a SocksPort, and use Socks5. Closes
5308 ticket 5547, implements proposal 117 as revised in proposal 208.
5310 We DO NOT recommend that clients with actual anonymity needs start
5311 using IPv6 over Tor yet, since not enough exits support it yet.
5313 o Major features (geoip database):
5314 - Maxmind began labelling Tor relays as being in country "A1",
5315 which breaks by-country node selection inside Tor. Now we use a
5316 script to replace "A1" ("Anonymous Proxy") entries in our geoip
5317 file with real country codes. This script fixes about 90% of "A1"
5318 entries automatically and uses manual country code assignments to
5319 fix the remaining 10%. See src/config/README.geoip for details.
5320 Fixes bug 6266. Also update to the December 5 2012 Maxmind GeoLite
5321 Country database, as modified above.
5323 o Major bugfixes (client-side DNS):
5324 - Turn off the client-side DNS cache by default. Updating and using
5325 the DNS cache is now configurable on a per-client-port
5326 level. SOCKSPort, DNSPort, etc lines may now contain
5327 {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
5328 cache these types of DNS answers when we receive them from an
5329 exit node in response to an application request on this port, and
5330 {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
5331 cached DNS answers of these types, we shouldn't use them. It's
5332 potentially risky to use cached DNS answers at the client, since
5333 doing so can indicate to one exit what answers we've gotten
5334 for DNS lookups in the past. With IPv6, this becomes especially
5335 problematic. Using cached DNS answers for requests on the same
5336 circuit would present less linkability risk, since all traffic
5337 on a circuit is already linkable, but it would also provide
5338 little performance benefit: the exit node caches DNS replies
5339 too. Implements a simplified version of Proposal 205. Implements
5342 o Major bugfixes (other):
5343 - Alter circuit build timeout measurement to start at the point
5344 where we begin the CREATE/CREATE_FAST step (as opposed to circuit
5345 initialization). This should make our timeout measurements more
5346 uniform. Previously, we were sometimes including ORconn setup time
5347 in our circuit build time measurements. Should resolve bug 3443.
5348 - Fix an assertion that could trigger in hibernate_go_dormant() when
5349 closing an or_connection_t: call channel_mark_for_close() rather
5350 than connection_mark_for_close(). Fixes bug 7267. Bugfix on
5352 - Include the geoip6 IPv6 GeoIP database in the tarball. Fixes bug
5353 7655; bugfix on 0.2.4.6-alpha.
5356 - Add a new torrc option "ServerTransportListenAddr" to let bridge
5357 operators select the address where their pluggable transports will
5358 listen for connections. Resolves ticket 7013.
5359 - Allow an optional $ before the node identity digest in the
5360 controller command GETINFO ns/id/<identity>, for consistency with
5361 md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
5362 - Log packaged cell fullness as part of the heartbeat message.
5363 Diagnosis to try to determine the extent of bug 7743.
5365 o Minor features (IPv6):
5366 - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
5367 prefer to hand out virtual IPv6 addresses, since there are more of
5368 them and we can't run out. To override this behavior and make IPv4
5369 addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
5370 or DNSPort you're using for resolving. Implements ticket 7571.
5371 - AutomapHostsOnResolve responses are now randomized, to avoid
5372 annoying situations where Tor is restarted and applications
5373 connect to the wrong addresses.
5374 - Never try more than 1000 times to pick a new virtual address when
5375 AutomapHostsOnResolve is set. That's good enough so long as we
5376 aren't close to handing out our entire virtual address space;
5377 if you're getting there, it's best to switch to IPv6 virtual
5381 - The ADDRMAP command can no longer generate an ill-formed error
5382 code on a failed MAPADDRESS. It now says "internal" rather than
5383 an English sentence fragment with spaces in the middle. Bugfix on
5385 - Fix log messages and comments to avoid saying "GMT" when we mean
5386 "UTC". Fixes bug 6113.
5387 - Compile on win64 using mingw64. Fixes bug 7260; patches from
5389 - Fix a crash when debugging unit tests on Windows: deallocate a
5390 shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
5391 bugfix on 0.2.2.17-alpha. Reported by "ultramage".
5394 - The DirServer option is now DirAuthority, for consistency with
5395 current naming patterns. You can still use the old DirServer form.
5397 o Code simplification and refactoring:
5398 - Move the client-side address-map/virtual-address/DNS-cache code
5399 out of connection_edge.c into a new addressmap.c module.
5400 - Remove unused code for parsing v1 directories and "running routers"
5401 documents. Fixes bug 6887.
5404 Changes in version 0.2.3.25 - 2012-11-19
5405 The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
5406 Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
5407 Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
5408 programmer, and friend. Unstinting in his dedication to the cause of
5409 freedom, he inspired and helped many of us as we began our work on
5410 anonymity, and inspires us still. Please honor his memory by writing
5411 software to protect people's freedoms, and by helping others to do so.
5413 Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
5414 significantly reduced directory overhead (via microdescriptors),
5415 enormous crypto performance improvements for fast relays on new
5416 enough hardware, a new v3 TLS handshake protocol that can better
5417 resist fingerprinting, support for protocol obfuscation plugins (aka
5418 pluggable transports), better scalability for hidden services, IPv6
5419 support for bridges, performance improvements like allowing clients
5420 to skip the first round-trip on the circuit ("optimistic data") and
5421 refilling token buckets more often, a new "stream isolation" design
5422 to isolate different applications on different circuits, and many
5423 stability, security, and privacy fixes.
5426 - Tor tries to wipe potentially sensitive data after using it, so
5427 that if some subsequent security failure exposes Tor's memory,
5428 the damage will be limited. But we had a bug where the compiler
5429 was eliminating these wipe operations when it decided that the
5430 memory was no longer visible to a (correctly running) program,
5431 hence defeating our attempt at defense in depth. We fix that
5432 by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
5433 is unlikely to optimize away. Future versions of Tor may use
5434 a less ridiculously heavy approach for this. Fixes bug 7352.
5435 Reported in an article by Andrey Karpov.
5438 - Fix a harmless bug when opting against publishing a relay descriptor
5439 because DisableNetwork is set. Fixes bug 7464; bugfix on
5443 Changes in version 0.2.4.6-alpha - 2012-11-13
5444 Tor 0.2.4.6-alpha fixes an assert bug that has been plaguing relays,
5445 makes our defense-in-depth memory wiping more reliable, and begins to
5446 count IPv6 addresses in bridge statistics,
5449 - Fix an assertion failure that could occur when closing a connection
5450 with a spliced rendezvous circuit. Fix for bug 7212; bugfix on
5452 - Tor tries to wipe potentially sensitive data after using it, so
5453 that if some subsequent security failure exposes Tor's memory,
5454 the damage will be limited. But we had a bug where the compiler
5455 was eliminating these wipe operations when it decided that the
5456 memory was no longer visible to a (correctly running) program,
5457 hence defeating our attempt at defense in depth. We fix that
5458 by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
5459 is unlikely to optimize away. Future versions of Tor may use
5460 a less ridiculously heavy approach for this. Fixes bug 7352.
5461 Reported in an article by Andrey Karpov.
5464 - Add GeoIP database for IPv6 addresses. The new config option
5466 - Bridge statistics now count bridge clients connecting over IPv6:
5467 bridge statistics files now list "bridge-ip-versions" and
5468 extra-info documents list "geoip6-db-digest". The control protocol
5469 "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
5470 implementation by "shkoo", addressing ticket 5055.
5473 - Warn when we are binding low ports when hibernation is enabled;
5474 previously we had warned when we were _advertising_ low ports with
5475 hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
5476 - Fix a harmless bug when opting against publishing a relay descriptor
5477 because DisableNetwork is set. Fixes bug 7464; bugfix on
5479 - Add warning message when a managed proxy dies during configuration.
5480 Fixes bug 7195; bugfix on 0.2.4.2-alpha.
5481 - Fix a linking error when building tor-fw-helper without miniupnp.
5482 Fixes bug 7235; bugfix on 0.2.4.2-alpha. Fix by Anthony G. Basile.
5483 - Check for closing an or_connection_t without going through correct
5484 channel functions; emit a warning and then call
5485 connection_or_close_for_error() so we don't assert as in bugs 7212
5487 - Compile correctly on compilers without C99 designated initializer
5488 support. Fixes bug 7286; bugfix on 0.2.4.4-alpha.
5489 - Avoid a possible assert that can occur when channel_send_destroy() is
5490 called on a channel in CHANNEL_STATE_CLOSING, CHANNEL_STATE_CLOSED,
5491 or CHANNEL_STATE_ERROR when the Tor process is resumed after being
5492 blocked for a long interval. Fixes bug 7350; bugfix on 0.2.4.4-alpha.
5493 - Fix a memory leak on failing cases of channel_tls_process_certs_cell.
5494 Fixes bug 7422; bugfix on 0.2.4.4-alpha.
5496 o Code simplification and refactoring:
5497 - Start using OpenBSD's implementation of queue.h, so that we don't
5498 need to hand-roll our own pointer and list structures whenever we
5499 need them. (We can't rely on a sys/queue.h, since some operating
5500 systems don't have them, and the ones that do have them don't all
5501 present the same extensions.)
5504 Changes in version 0.2.4.5-alpha - 2012-10-25
5505 Tor 0.2.4.5-alpha comes hard at the heels of 0.2.4.4-alpha, to fix
5506 two important security vulnerabilities that could lead to remotely
5507 triggerable relay crashes, fix a major bug that was preventing clients
5508 from choosing suitable exit nodes, and refactor some of our code.
5510 o Major bugfixes (security, also in 0.2.3.24-rc):
5511 - Fix a group of remotely triggerable assertion failures related to
5512 incorrect link protocol negotiation. Found, diagnosed, and fixed
5513 by "some guy from France". Fix for CVE-2012-2250; bugfix on
5515 - Fix a denial of service attack by which any directory authority
5516 could crash all the others, or by which a single v2 directory
5517 authority could crash everybody downloading v2 directory
5518 information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
5520 o Major bugfixes (also in 0.2.3.24-rc):
5521 - When parsing exit policy summaries from microdescriptors, we had
5522 previously been ignoring the last character in each one, so that
5523 "accept 80,443,8080" would be treated by clients as indicating
5524 a node that allows access to ports 80, 443, and 808. That would
5525 lead to clients attempting connections that could never work,
5526 and ignoring exit nodes that would support their connections. Now
5527 clients parse these exit policy summaries correctly. Fixes bug 7192;
5528 bugfix on 0.2.3.1-alpha.
5530 o Minor bugfixes (also in 0.2.3.24-rc):
5531 - Clients now consider the ClientRejectInternalAddresses config option
5532 when using a microdescriptor consensus stanza to decide whether
5533 an exit relay would allow exiting to an internal address. Fixes
5534 bug 7190; bugfix on 0.2.3.1-alpha.
5537 - Only disable TLS session ticket support when running as a TLS
5538 server. Now clients will blend better with regular Firefox
5539 connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
5541 o Code simplification and refactoring:
5542 - Start using OpenBSD's implementation of queue.h (originally by
5544 - Move the entry node code from circuitbuild.c to its own file.
5545 - Move the circuit build timeout tracking code from circuitbuild.c
5549 Changes in version 0.2.3.24-rc - 2012-10-25
5550 Tor 0.2.3.24-rc fixes two important security vulnerabilities that
5551 could lead to remotely triggerable relay crashes, and fixes
5552 a major bug that was preventing clients from choosing suitable exit
5555 o Major bugfixes (security):
5556 - Fix a group of remotely triggerable assertion failures related to
5557 incorrect link protocol negotiation. Found, diagnosed, and fixed
5558 by "some guy from France". Fix for CVE-2012-2250; bugfix on
5560 - Fix a denial of service attack by which any directory authority
5561 could crash all the others, or by which a single v2 directory
5562 authority could crash everybody downloading v2 directory
5563 information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
5566 - When parsing exit policy summaries from microdescriptors, we had
5567 previously been ignoring the last character in each one, so that
5568 "accept 80,443,8080" would be treated by clients as indicating
5569 a node that allows access to ports 80, 443, and 808. That would
5570 lead to clients attempting connections that could never work,
5571 and ignoring exit nodes that would support their connections. Now
5572 clients parse these exit policy summaries correctly. Fixes bug 7192;
5573 bugfix on 0.2.3.1-alpha.
5576 - Clients now consider the ClientRejectInternalAddresses config option
5577 when using a microdescriptor consensus stanza to decide whether
5578 an exit relay would allow exiting to an internal address. Fixes
5579 bug 7190; bugfix on 0.2.3.1-alpha.
5582 Changes in version 0.2.4.4-alpha - 2012-10-20
5583 Tor 0.2.4.4-alpha adds a new v3 directory authority, fixes a privacy
5584 vulnerability introduced by a change in OpenSSL, fixes a remotely
5585 triggerable assert, and adds new channel_t and circuitmux_t abstractions
5586 that will make it easier to test new connection transport and cell
5587 scheduling algorithms.
5589 o New directory authorities (also in 0.2.3.23-rc):
5590 - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
5591 authority. Closes ticket 5749.
5593 o Major bugfixes (security/privacy, also in 0.2.3.23-rc):
5594 - Disable TLS session tickets. OpenSSL's implementation was giving
5595 our TLS session keys the lifetime of our TLS context objects, when
5596 perfect forward secrecy would want us to discard anything that
5597 could decrypt a link connection as soon as the link connection
5598 was closed. Fixes bug 7139; bugfix on all versions of Tor linked
5599 against OpenSSL 1.0.0 or later. Found by Florent Daignière.
5600 - Discard extraneous renegotiation attempts once the V3 link
5601 protocol has been initiated. Failure to do so left us open to
5602 a remotely triggerable assertion failure. Fixes CVE-2012-2249;
5603 bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
5605 o Internal abstraction features:
5606 - Introduce new channel_t abstraction between circuits and
5607 or_connection_t to allow for implementing alternate OR-to-OR
5608 transports. A channel_t is an abstract object which can either be a
5609 cell-bearing channel, which is responsible for authenticating and
5610 handshaking with the remote OR and transmitting cells to and from
5611 it, or a listening channel, which spawns new cell-bearing channels
5612 at the request of remote ORs. Implements part of ticket 6465.
5613 - Also new is the channel_tls_t subclass of channel_t, adapting it
5614 to the existing or_connection_t code. The V2/V3 protocol handshaking
5615 code which formerly resided in command.c has been moved below the
5616 channel_t abstraction layer and may be found in channeltls.c now.
5617 Implements the rest of ticket 6465.
5618 - Introduce new circuitmux_t storing the queue of circuits for
5619 a channel; this encapsulates and abstracts the queue logic and
5620 circuit selection policy, and allows the latter to be overridden
5621 easily by switching out a policy object. The existing EWMA behavior
5622 is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
5624 o Required libraries:
5625 - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
5626 strongly recommended.
5629 - Warn users who run hidden services on a Tor client with
5630 UseEntryGuards disabled that their hidden services will be
5631 vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
5632 attack which motivated Tor to support entry guards in the first
5633 place). Resolves ticket 6889.
5634 - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
5635 dhill. Resolves ticket 6982.
5636 - Option OutboundBindAddress can be specified multiple times and
5637 accepts IPv6 addresses. Resolves ticket 6876.
5639 o Minor bugfixes (also in 0.2.3.23-rc):
5640 - Don't serve or accept v2 hidden service descriptors over a
5641 relay's DirPort. It's never correct to do so, and disabling it
5642 might make it more annoying to exploit any bugs that turn up in the
5643 descriptor-parsing code. Fixes bug 7149.
5644 - Fix two cases in src/or/transports.c where we were calling
5645 fmt_addr() twice in a parameter list. Bug found by David
5646 Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
5647 - Fix memory leaks whenever we logged any message about the "path
5648 bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
5649 - When relays refuse a "create" cell because their queue of pending
5650 create cells is too big (typically because their cpu can't keep up
5651 with the arrival rate), send back reason "resource limit" rather
5652 than reason "internal", so network measurement scripts can get a
5653 more accurate picture. Fixes bug 7037; bugfix on 0.1.1.11-alpha.
5656 - Command-line option "--version" implies "--quiet". Fixes bug 6997.
5657 - Free some more still-in-use memory at exit, to make hunting for
5658 memory leaks easier. Resolves bug 7029.
5659 - When a Tor client gets a "truncated" relay cell, the first byte of
5660 its payload specifies why the circuit was truncated. We were
5661 ignoring this 'reason' byte when tearing down the circuit, resulting
5662 in the controller not being told why the circuit closed. Now we
5663 pass the reason from the truncated cell to the controller. Bugfix
5664 on 0.1.2.3-alpha; fixes bug 7039.
5665 - Downgrade "Failed to hand off onionskin" messages to "debug"
5666 severity, since they're typically redundant with the "Your computer
5667 is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
5668 - Make clients running with IPv6 bridges connect over IPv6 again,
5669 even without setting new config options ClientUseIPv6 and
5670 ClientPreferIPv6ORPort. Fixes bug 6757; bugfix on 0.2.4.1-alpha.
5671 - Use square brackets around IPv6 addresses in numerous places
5672 that needed them, including log messages, HTTPS CONNECT proxy
5673 requests, TransportProxy statefile entries, and pluggable transport
5674 extra-info lines. Fixes bug 7011; patch by David Fifield.
5676 o Code refactoring and cleanup:
5677 - Source files taken from other packages now reside in src/ext;
5678 previously they were scattered around the rest of Tor.
5679 - Avoid use of reserved identifiers in our C code. The C standard
5680 doesn't like us declaring anything that starts with an
5681 underscore, so let's knock it off before we get in trouble. Fix
5682 for bug 1031; bugfix on the first Tor commit.
5685 Changes in version 0.2.3.23-rc - 2012-10-20
5686 Tor 0.2.3.23-rc adds a new v3 directory authority, fixes a privacy
5687 vulnerability introduced by a change in OpenSSL, and fixes a variety
5688 of smaller bugs in preparation for the release.
5690 o New directory authorities:
5691 - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
5692 authority. Closes ticket 5749.
5694 o Major bugfixes (security/privacy):
5695 - Disable TLS session tickets. OpenSSL's implementation was giving
5696 our TLS session keys the lifetime of our TLS context objects, when
5697 perfect forward secrecy would want us to discard anything that
5698 could decrypt a link connection as soon as the link connection
5699 was closed. Fixes bug 7139; bugfix on all versions of Tor linked
5700 against OpenSSL 1.0.0 or later. Found by Florent Daignière.
5701 - Discard extraneous renegotiation attempts once the V3 link
5702 protocol has been initiated. Failure to do so left us open to
5703 a remotely triggerable assertion failure. Fixes CVE-2012-2249;
5704 bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
5707 - Fix a possible crash bug when checking for deactivated circuits
5708 in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
5709 bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
5711 o Minor bugfixes (on 0.2.3.x):
5712 - Fix two cases in src/or/transports.c where we were calling
5713 fmt_addr() twice in a parameter list. Bug found by David
5714 Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
5715 - Convert an assert in the pathbias code to a log message. The assert
5716 appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
5717 bugfix on 0.2.3.17-beta.
5718 - Fix memory leaks whenever we logged any message about the "path
5719 bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
5721 o Minor bugfixes (on 0.2.2.x and earlier):
5722 - Don't serve or accept v2 hidden service descriptors over a relay's
5723 DirPort. It's never correct to do so, and disabling it might
5724 make it more annoying to exploit any bugs that turn up in the
5725 descriptor-parsing code. Fixes bug 7149.
5726 - When relays refuse a "create" cell because their queue of pending
5727 create cells is too big (typically because their cpu can't keep up
5728 with the arrival rate), send back reason "resource limit" rather
5729 than reason "internal", so network measurement scripts can get a
5730 more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
5731 - Correct file sizes when reading binary files on Cygwin, to avoid
5732 a bug where Tor would fail to read its state file. Fixes bug 6844;
5733 bugfix on 0.1.2.7-alpha.
5734 - Avoid undefined behavior when parsing the list of supported
5735 rendezvous/introduction protocols in a hidden service descriptor.
5736 Previously, Tor would have confused (as-yet-unused) protocol version
5737 numbers greater than 32 with lower ones on many platforms. Fixes
5738 bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
5740 o Documentation fixes:
5741 - Clarify that hidden services are TCP only. Fixes bug 6024.
5744 Changes in version 0.2.4.3-alpha - 2012-09-22
5745 Tor 0.2.4.3-alpha fixes another opportunity for a remotely triggerable
5746 assertion, resumes letting relays test reachability of their DirPort,
5747 and cleans up a bunch of smaller bugs.
5750 - Fix an assertion failure in tor_timegm() that could be triggered
5751 by a badly formatted directory object. Bug found by fuzzing with
5752 Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
5755 - Fix a possible crash bug when checking for deactivated circuits
5756 in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
5757 bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
5758 - Allow routers to detect that their own DirPorts are running. When
5759 we removed support for versions_supports_begindir, we also
5760 accidentally removed the mechanism we used to self-test our
5761 DirPort. Diagnosed with help from kargig. Fixes bugs 6814 and 6815;
5762 bugfix on 0.2.4.2-alpha.
5764 o Security features:
5765 - Switch to a completely time-invariant approach for picking nodes
5766 weighted by bandwidth. Our old approach would run through the
5767 part of the loop after it had made its choice slightly slower
5768 than it ran through the part of the loop before it had made its
5769 choice. Addresses ticket 6538.
5770 - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
5771 by tor2web clients allows hidden services to identify tor2web
5772 clients through their repeated selection of the same rendezvous
5773 and introduction point circuit endpoints (their guards). Resolves
5777 - Enable Tor to read configuration, state, and key information from
5778 a FIFO. Previously Tor would only read from files with a positive
5779 stat.st_size. Code from meejah; fixes bug 6044.
5782 - Correct file sizes when reading binary files on Cygwin, to avoid
5783 a bug where Tor would fail to read its state file. Fixes bug 6844;
5784 bugfix on 0.1.2.7-alpha.
5785 - Correctly handle votes with more than 31 flags. Fixes bug 6853;
5786 bugfix on 0.2.0.3-alpha.
5787 - When complaining about a client port on a public address, log
5788 which address we're complaining about. Fixes bug 4020; bugfix on
5789 0.2.3.3-alpha. Patch by Tom Fitzhenry.
5790 - Convert an assert in the pathbias code to a log message. The assert
5791 appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
5792 bugfix on 0.2.3.17-beta.
5793 - Our new buildsystem was overzealous about rebuilding manpages: it
5794 would rebuild them all whenever any one of them changed. Now our
5795 dependency checking should be correct. Fixes bug 6843; bugfix on
5797 - Don't do reachability testing over IPv6 unless AuthDirPublishIPv6
5798 is set. Fixes bug 6880. Bugfix on 0.2.4.1-alpha.
5799 - Correct log printout about which address family is preferred
5800 when connecting to a bridge with both an IPv4 and IPv6 OR port.
5801 Fixes bug 6884; bugfix on 0.2.4.1-alpha.
5803 o Minor bugfixes (code cleanliness):
5804 - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
5805 with large values. This situation was untriggered, but nevertheless
5806 incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
5807 - Reject consensus votes with more than 64 known-flags. We aren't even
5808 close to that limit yet, and our code doesn't handle it correctly.
5809 Fixes bug 6833; bugfix on 0.2.0.1-alpha.
5810 - Avoid undefined behavior when parsing the list of supported
5811 rendezvous/introduction protocols in a hidden service descriptor.
5812 Previously, Tor would have confused (as-yet-unused) protocol version
5813 numbers greater than 32 with lower ones on many platforms. Fixes
5814 bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
5815 - Fix handling of rendezvous client authorization types over 8.
5816 Fixes bug 6861; bugfix on 0.2.1.5-alpha.
5817 - Fix building with older versions of GCC (2.95, for one) that don't
5818 like preprocessor directives inside macro arguments. Found by
5819 grarpamp. Fixes bug 6842; bugfix on 0.2.4.2-alpha.
5820 - Switch weighted node selection rule from using a list of doubles
5821 to using a list of int64_t. This change should make the process
5822 slightly easier to debug and maintain. Needed to finish ticket 6538.
5824 o Code simplification and refactoring:
5825 - Move the generic "config" code into a new file, and have "config.c"
5826 hold only torrc- and state-related code. Resolves ticket 6823.
5827 - Move the core of our "choose a weighted element at random" logic
5828 into its own function, and give it unit tests. Now the logic is
5829 testable, and a little less fragile too.
5830 - Removed the testing_since field of node_t, which hasn't been used
5831 for anything since 0.2.0.9-alpha.
5833 o Documentation fixes:
5834 - Clarify that hidden services are TCP only. Fixes bug 6024.
5835 - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
5839 Changes in version 0.2.3.22-rc - 2012-09-11
5840 Tor 0.2.3.22-rc fixes another opportunity for a remotely triggerable
5844 - Fix an assertion failure in tor_timegm() that could be triggered
5845 by a badly formatted directory object. Bug found by fuzzing with
5846 Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
5849 - Avoid segfault when starting up having run with an extremely old
5850 version of Tor and parsing its state file. Fixes bug 6801; bugfix
5854 Changes in version 0.2.2.39 - 2012-09-11
5855 Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
5859 - Fix an assertion failure in tor_timegm() that could be triggered
5860 by a badly formatted directory object. Bug found by fuzzing with
5861 Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
5862 - Do not crash when comparing an address with port value 0 to an
5863 address policy. This bug could have been used to cause a remote
5864 assertion failure by or against directory authorities, or to
5865 allow some applications to crash clients. Fixes bug 6690; bugfix
5869 Changes in version 0.2.4.2-alpha - 2012-09-10
5870 Tor 0.2.4.2-alpha enables port forwarding for pluggable transports,
5871 raises the default rate limiting even more, and makes the bootstrapping
5872 log messages less noisy.
5875 - Automatically forward the TCP ports of pluggable transport
5876 proxies using tor-fw-helper if PortForwarding is enabled. Implements
5880 - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
5881 to 1GB/1GB. The previous defaults were intended to be "basically
5882 infinite", but it turns out they're now limiting our 100mbit+
5883 relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
5884 last time we raised it).
5887 - Detect when we're running with a version of OpenSSL other than the
5888 one we compiled with. This has occasionally given people hard-to-
5890 - Log fewer lines at level "notice" about our OpenSSL and Libevent
5891 versions and capabilities when everything is going right. Resolves
5892 part of ticket 6736.
5893 - Directory authorities no long accept descriptors for any version of
5894 Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
5895 These versions are insecure, unsupported, or both. Implements
5899 - Rename the (internal-use-only) UsingTestingNetworkDefaults option
5900 to start with a triple-underscore so the controller won't touch it.
5901 Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
5902 - Avoid segfault when starting up having run with an extremely old
5903 version of Tor and parsing its state file. Fixes bug 6801; bugfix
5905 - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
5906 so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
5907 - Don't follow the NULL pointer if microdescriptor generation fails.
5908 (This does not appear to be triggerable, but it's best to be safe.)
5909 Found by "f. tp.". Fixes bug 6797; bugfix on 0.2.4.1-alpha.
5910 - Fix mis-declared dependencies on src/common/crypto.c and
5911 src/or/tor_main.c that could break out-of-tree builds under some
5912 circumstances. Fixes bug 6778; bugfix on 0.2.4.1-alpha.
5913 - Avoid a warning when building common_sha1.i out of tree. Fixes bug
5914 6778; bugfix on 0.2.4.1-alpha.
5915 - Fix a harmless (in this case) build warning for implicitly
5916 converting a strlen() to an int. Bugfix on 0.2.4.1-alpha.
5919 - Now that all versions before 0.2.2.x are disallowed, we no longer
5920 need to work around their missing features. Thus we can remove a
5921 bunch of compatibility code.
5924 - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
5925 TCP ports to forward. In the past it only accepted two ports:
5926 the ORPort and the DirPort.
5929 Changes in version 0.2.4.1-alpha - 2012-09-05
5930 Tor 0.2.4.1-alpha lets bridges publish their pluggable transports to
5931 bridgedb; lets relays use IPv6 addresses and directory authorities
5932 advertise them; and switches to a cleaner build interface.
5934 This is the first alpha release in a new series, so expect there to
5935 be bugs. Users who would rather test out a more stable branch should
5936 stay with 0.2.3.x for now.
5938 o Major features (bridges):
5939 - Bridges now report the pluggable transports they support to the
5940 bridge authority, so it can pass the supported transports on to
5941 bridgedb and/or eventually do reachability testing. Implements
5944 o Major features (IPv6):
5945 - Bridge authorities now accept IPv6 bridge addresses and include
5946 them in network status documents. Implements ticket 5534.
5947 - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
5948 IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
5949 to happen. Implements ticket 5535.
5950 - All kind of relays, not just bridges, can now advertise an IPv6
5951 OR port. Implements ticket 6362.
5952 - Directory authorities vote on IPv6 OR ports using the new consensus
5953 method 14. Implements ticket 6363.
5955 o Major features (build):
5956 - Switch to a nonrecursive Makefile structure. Now instead of each
5957 Makefile.am invoking other Makefile.am's, there is a master
5958 Makefile.am that includes the others. This change makes our build
5959 process slightly more maintainable, and improves parallelism for
5960 building with make -j. Original patch by Stewart Smith; various
5961 fixes by Jim Meyering.
5962 - Where available, we now use automake's "silent" make rules by
5963 default, so that warnings are easier to spot. You can get the old
5964 behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
5966 o Minor features (code security and spec conformance):
5967 - Clear keys and key-derived material left on the stack in
5968 rendservice.c and rendclient.c. Check return value of
5969 crypto_pk_write_private_key_to_string() in rend_service_load_keys().
5970 These fixes should make us more forward-secure against cold-boot
5971 attacks and the like. Fixes bug 2385.
5972 - Reject EXTEND cells sent to nonexistent streams. According to the
5973 spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
5974 we were only checking for stream IDs that were currently in use.
5975 Found while hunting for more instances of bug 6271. Bugfix on
5976 0.0.2pre8, which introduced incremental circuit construction.
5978 o Minor features (streamlining);
5979 - No longer include the "opt" prefix when generating routerinfos
5980 or v2 directories: it has been needless since Tor 0.1.2. Closes
5982 - Remove some now-needless code that tried to aggressively flush
5983 OR connections as data was added to them. Since 0.2.0.1-alpha, our
5984 cell queue logic has saved us from the failure mode that this code
5985 was supposed to prevent. Removing this code will limit the number
5986 of baroque control flow paths through Tor's network logic. Reported
5987 pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
5989 o Minor features (controller):
5990 - Add a "GETINFO signal/names" control port command. Implements
5992 - Provide default values for all options via "GETINFO config/defaults".
5993 Implements ticket 4971.
5995 o Minor features (IPv6):
5996 - New config option "AuthDirHasIPv6Connectivity 1" that directory
5997 authorities should set if they have IPv6 connectivity and want to
5998 do reachability tests for IPv6 relays. Implements feature 5974.
5999 - A relay with an IPv6 OR port now sends that address in NETINFO
6000 cells (in addition to its other address). Implements ticket 6364.
6002 o Minor features (log messages):
6003 - Omit the first heartbeat log message, because it never has anything
6004 useful to say, and it clutters up the bootstrapping messages.
6005 Resolves ticket 6758.
6006 - Don't log about reloading the microdescriptor cache at startup. Our
6007 bootstrap warnings are supposed to tell the user when there's a
6008 problem, and our bootstrap notices say when there isn't. Resolves
6009 ticket 6759; bugfix on 0.2.2.6-alpha.
6010 - Don't log "I learned some more directory information" when we're
6011 reading cached directory information. Reserve it for when new
6012 directory information arrives in response to a fetch. Resolves
6014 - Prevent rounding error in path bias counts when scaling
6015 them down, and use the correct scale factor default. Also demote
6016 some path bias related log messages down a level and make others
6017 less scary sounding. Fixes bug 6647. Bugfix against 0.2.3.17-beta.
6018 - We no longer warn so much when generating manpages from their
6021 o Code simplifications and refactoring:
6022 - Enhance our internal sscanf replacement so that we can eliminate
6023 the last remaining uses of the system sscanf. (Though those uses
6024 of sscanf were safe, sscanf itself is generally error prone, so
6025 we want to eliminate when we can.) Fixes ticket 4195 and Coverity
6027 - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
6028 - Move last_reachable and testing_since from routerinfo_t to node_t.
6029 Implements ticket 5529.
6030 - Add replaycache_t structure, functions and unit tests, then refactor
6031 rend_service_introduce() to be more clear to read, improve, debug,
6032 and test. Resolves bug 6177.
6033 - Finally remove support for malloc_good_size and malloc_usable_size.
6034 We had hoped that these functions would let us eke a little more
6035 memory out of our malloc implementation. Unfortunately, the only
6036 implementations that provided these functions are also ones that
6037 are already efficient about not overallocation: they never got us
6038 more than 7 or so bytes per allocation. Removing them saves us a
6039 little code complexity and a nontrivial amount of build complexity.
6042 - Tor maintainers now require Automake version 1.9 or later to build
6043 Tor from the Git repository. (Automake is not required when building
6044 from a source distribution.)
6047 Changes in version 0.2.3.21-rc - 2012-09-05
6048 Tor 0.2.3.21-rc is the fourth release candidate for the Tor 0.2.3.x
6049 series. It fixes a trio of potential security bugs, fixes a bug where
6050 we were leaving some of the fast relays out of the microdescriptor
6051 consensus, resumes interpreting "ORPort 0" and "DirPort 0" correctly,
6052 and cleans up other smaller issues.
6054 o Major bugfixes (security):
6055 - Tear down the circuit if we get an unexpected SENDME cell. Clients
6056 could use this trick to make their circuits receive cells faster
6057 than our flow control would have allowed, or to gum up the network,
6058 or possibly to do targeted memory denial-of-service attacks on
6059 entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
6060 from July 2002, before the release of Tor 0.0.0. We had committed
6061 this patch previously, but we had to revert it because of bug 6271.
6062 Now that 6271 is fixed, this patch appears to work.
6063 - Reject any attempt to extend to an internal address. Without
6064 this fix, a router could be used to probe addresses on an internal
6065 network to see whether they were accepting connections. Fixes bug
6066 6710; bugfix on 0.0.8pre1.
6067 - Do not crash when comparing an address with port value 0 to an
6068 address policy. This bug could have been used to cause a remote
6069 assertion failure by or against directory authorities, or to
6070 allow some applications to crash clients. Fixes bug 6690; bugfix
6074 - Remove the upper bound on microdescriptor length. We were hitting
6075 the limit for routers with complex exit policies or family
6076 declarations, causing clients to not use them. Fixes the first
6077 piece of bug 6404; fix on 0.2.2.6-alpha.
6078 - Detect "ORPort 0" as meaning, uniformly, that we're not running
6079 as a relay. Previously, some of our code would treat the presence
6080 of any ORPort line as meaning that we should act like a relay,
6081 even though our new listener code would correctly not open any
6082 ORPorts for ORPort 0. Similar bugs in other Port options are also
6083 fixed. Fixes the first half of bug 6507; bugfix on 0.2.3.3-alpha.
6086 - Avoid a pair of double-free and use-after-mark bugs that can
6087 occur with certain timings in canceled and re-received DNS
6088 requests. Fixes bug 6472; bugfix on 0.0.7rc1.
6089 - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
6090 Fixes bug 6379. Bugfix on 0.2.0.20-rc.
6091 - Allow one-hop directory fetching circuits the full "circuit build
6092 timeout" period, rather than just half of it, before failing them
6093 and marking the relay down. This fix should help reduce cases where
6094 clients declare relays (or worse, bridges) unreachable because
6095 the TLS handshake takes a few seconds to complete. Fixes bug 6743;
6096 bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
6098 - Authorities no longer include any router in their microdescriptor
6099 consensuses for which they couldn't generate or agree on a
6100 microdescriptor. Fixes the second piece of bug 6404; fix on
6102 - Detect and reject attempts to specify both "FooPort" and
6103 "FooPort 0" in the same configuration domain. (It's still okay
6104 to have a FooPort in your configuration file, and use "FooPort 0"
6105 on the command line to disable it.) Fixes the second half of bug
6106 6507; bugfix on 0.2.3.3-alpha.
6107 - Make wildcarded addresses (that is, ones beginning with "*.") work
6108 when provided via the controller's MapAddress command. Previously,
6109 they were accepted, but we never actually noticed that they were
6110 wildcards. Fixes bug 6244; bugfix on 0.2.3.9-alpha.
6111 - Avoid crashing on a malformed state file where EntryGuardPathBias
6112 precedes EntryGuard. Fix for bug 6774; bugfix on 0.2.3.17-beta.
6113 - Add a (probably redundant) memory clear between iterations of
6114 the router status voting loop, to prevent future coding errors
6115 where data might leak between iterations of the loop. Resolves
6118 o Minor bugfixes (log messages):
6119 - Downgrade "set buildtimeout to low value" messages to "info"
6120 severity; they were never an actual problem, there was never
6121 anything reasonable to do about them, and they tended to spam logs
6122 from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
6123 - Downgrade path-bias warning messages to "info". We'll try to get
6124 them working better in 0.2.4. Add internal circuit construction
6125 state to protect against the noisy warn message "Unexpectedly high
6126 circuit_successes". Also add some additional rate-limited notice
6127 messages to help determine the root cause of the warn. Fixes bug
6128 6475. Bugfix against 0.2.3.17-beta.
6129 - Move log message when unable to find a microdesc in a routerstatus
6130 entry to parse time. Previously we'd spam this warning every time
6131 we tried to figure out which microdescriptors to download. Fixes
6132 the third piece of bug 6404; fix on 0.2.3.18-rc.
6135 - Consider new, removed or changed IPv6 OR ports a non-cosmetic
6136 change when the authority is deciding whether to accept a newly
6137 uploaded descriptor. Implements ticket 6423.
6138 - Add missing documentation for consensus and microdesc files.
6139 Resolves ticket 6732.
6142 Changes in version 0.2.2.38 - 2012-08-12
6143 Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
6144 attack that could in theory leak path information.
6147 - Avoid an uninitialized memory read when reading a vote or consensus
6148 document that has an unrecognized flavor name. This read could
6149 lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
6150 - Try to leak less information about what relays a client is
6151 choosing to a side-channel attacker. Previously, a Tor client would
6152 stop iterating through the list of available relays as soon as it
6153 had chosen one, thus finishing a little earlier when it picked
6154 a router earlier in the list. If an attacker can recover this
6155 timing information (nontrivial but not proven to be impossible),
6156 they could learn some coarse-grained information about which relays
6157 a client was picking (middle nodes in particular are likelier to
6158 be affected than exits). The timing attack might be mitigated by
6159 other factors (see bug 6537 for some discussion), but it's best
6160 not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
6163 Changes in version 0.2.3.20-rc - 2012-08-05
6164 Tor 0.2.3.20-rc is the third release candidate for the Tor 0.2.3.x
6165 series. It fixes a pair of code security bugs and a potential anonymity
6166 issue, updates our RPM spec files, and cleans up other smaller issues.
6169 - Avoid read-from-freed-memory and double-free bugs that could occur
6170 when a DNS request fails while launching it. Fixes bug 6480;
6171 bugfix on 0.2.0.1-alpha.
6172 - Avoid an uninitialized memory read when reading a vote or consensus
6173 document that has an unrecognized flavor name. This read could
6174 lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
6175 - Try to leak less information about what relays a client is
6176 choosing to a side-channel attacker. Previously, a Tor client would
6177 stop iterating through the list of available relays as soon as it
6178 had chosen one, thus finishing a little earlier when it picked
6179 a router earlier in the list. If an attacker can recover this
6180 timing information (nontrivial but not proven to be impossible),
6181 they could learn some coarse-grained information about which relays
6182 a client was picking (middle nodes in particular are likelier to
6183 be affected than exits). The timing attack might be mitigated by
6184 other factors (see bug 6537 for some discussion), but it's best
6185 not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
6188 - Try to make the warning when giving an obsolete SOCKSListenAddress
6189 a little more useful.
6190 - Terminate active server managed proxies if Tor stops being a
6191 relay. Addresses parts of bug 6274; bugfix on 0.2.3.6-alpha.
6192 - Provide a better error message about possible OSX Asciidoc failure
6193 reasons. Fixes bug 6436.
6194 - Warn when Tor is configured to use accounting in a way that can
6195 link a hidden service to some other hidden service or public
6196 address. Resolves ticket 6490.
6199 - Check return value of fputs() when writing authority certificate
6200 file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
6201 - Ignore ServerTransportPlugin lines when Tor is not configured as
6202 a relay. Fixes bug 6274; bugfix on 0.2.3.6-alpha.
6203 - When disabling guards for having too high a proportion of failed
6204 circuits, make sure to look at each guard. Fixes bug 6397; bugfix
6208 - Update our default RPM spec files to work with mock and rpmbuild
6209 on RHEL/Fedora. They have an updated set of dependencies and
6210 conflicts, a fix for an ancient typo when creating the "_tor"
6211 user, and better instructions. Thanks to Ondrej Mikle for the
6212 patch series. Fixes bug 6043.
6215 - Make it possible to set the TestingTorNetwork configuration
6216 option using AlternateDirAuthority and AlternateBridgeAuthority
6217 as an alternative to setting DirServer. Addresses ticket 6377.
6220 - Clarify the documentation for the Alternate*Authority options.
6222 - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
6224 o Code simplification and refactoring:
6225 - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
6226 10 lines. Also, don't nest them. Doing so in the past has
6227 led to hard-to-debug code. The new style is to use the
6228 SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
6231 Changes in version 0.2.3.19-rc - 2012-07-06
6232 Tor 0.2.3.19-rc is the second release candidate for the Tor 0.2.3.x
6233 series. It fixes the compile on Windows, reverts to a GeoIP database
6234 that isn't as broken, and fixes a flow control bug that has been around
6235 since the beginning of Tor.
6238 - Fix a bug handling SENDME cells on nonexistent streams that could
6239 result in bizarre window values. Report and patch contributed
6240 pseudonymously. Fixes part of bug 6271. This bug was introduced
6241 before the first Tor release, in svn commit r152.
6242 - Revert to the May 1 2012 Maxmind GeoLite Country database. In the
6243 June 2012 database, Maxmind marked many Tor relays as country "A1",
6244 which will cause risky behavior for clients that set EntryNodes
6245 or ExitNodes. Addresses bug 6334; bugfix on 0.2.3.17-beta.
6246 - Instead of ENOBUFS on Windows, say WSAENOBUFS. Fixes compilation
6247 on Windows. Fixes bug 6296; bugfix on 0.2.3.18-rc.
6250 - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
6251 bugfix on 0.2.1.10-alpha.
6254 Changes in version 0.2.3.18-rc - 2012-06-28
6255 Tor 0.2.3.18-rc is the first release candidate for the Tor 0.2.3.x
6256 series. It fixes a few smaller bugs, but generally appears stable.
6257 Please test it and let us know whether it is!
6260 - Allow wildcarded mapaddress targets to be specified on the
6261 controlport. Partially fixes bug 6244; bugfix on 0.2.3.9-alpha.
6262 - Make our linker option detection code more robust against linkers
6263 such as on FreeBSD 8, where a bad combination of options completes
6264 successfully but makes an unrunnable binary. Fixes bug 6173;
6265 bugfix on 0.2.3.17-beta.
6267 o Minor bugfixes (on 0.2.2.x and earlier):
6268 - Avoid a false positive in the util/threads unit test by increasing
6269 the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
6270 - Replace "Sending publish request" log messages with "Launching
6271 upload", so that they no longer confusingly imply that we're
6272 sending something to a directory we might not even be connected
6273 to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
6274 - Make sure to set *socket_error in all error cases in
6275 connection_connect(), so it can't produce a warning about
6276 errno being zero from errno_to_orconn_end_reason(). Bugfix on
6277 0.2.1.1-alpha; resolves ticket 6028.
6278 - Downgrade "Got a certificate, but we already have it" log messages
6279 from warning to info, except when we're a dirauth. Fixes bug 5238;
6280 bugfix on 0.2.1.7-alpha.
6281 - When checking for requested signatures on the latest consensus
6282 before serving it to a client, make sure to check the right
6283 consensus flavor. Bugfix on 0.2.2.6-alpha.
6284 - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
6285 Fixes bug 5932; bugfix on 0.2.2.7-alpha.
6287 o Minor bugfixes (on 0.2.3.x):
6288 - Make format_helper_exit_status() avoid unnecessary space padding
6289 and stop confusing log_from_pipe(). Fixes ticket 5557; bugfix
6291 - Downgrade a message about cleaning the microdescriptor cache to
6292 "info" from "notice". Fixes bug 6238; bugfix on 0.2.3.1-alpha.
6293 - Log a BUG message at severity INFO if we have a networkstatus with
6294 a missing entry for some microdescriptor. Continues on a patch
6296 - Improve the log message when a managed proxy fails to launch. Fixes
6297 bug 5099; bugfix on 0.2.3.6-alpha.
6298 - Don't do DNS lookups when parsing corrupted managed proxy protocol
6299 messages. Fixes bug 6226; bugfix on 0.2.3.6-alpha.
6300 - When formatting wildcarded address mappings for the controller,
6301 be sure to include "*." as appropriate. Partially fixes bug 6244;
6302 bugfix on 0.2.3.9-alpha.
6303 - Avoid a warning caused by using strcspn() from glibc with clang 3.0.
6304 Bugfix on 0.2.3.13-alpha.
6305 - Stop logging messages about running with circuit timeout learning
6306 enabled at severity LD_BUG. Fixes bug 6169; bugfix on 0.2.3.17-beta.
6307 - Disable a spurious warning about reading on a marked and flushing
6308 connection. We shouldn't be doing that, but apparently we
6309 sometimes do. Fixes bug 6203; bugfix on 0.2.3.17-beta.
6310 - Fix a bug that stopped AllowDotExit from working on addresses
6311 that had an entry in the DNS cache. Fixes bug 6211; bugfix on
6314 o Code simplification, refactoring, unit tests:
6315 - Move tor_gettimeofday_cached() into compat_libevent.c, and use
6316 Libevent's notion of cached time when possible.
6317 - Remove duplicate code for invoking getrlimit() from control.c.
6318 - Add a unit test for the environment_variable_names_equal function.
6321 - Document the --defaults-torrc option, and the new (in 0.2.3)
6322 semantics for overriding, extending, and clearing lists of
6323 options. Closes bug 4748.
6326 Changes in version 0.2.3.17-beta - 2012-06-15
6327 Tor 0.2.3.17-beta enables compiler and linker hardening by default,
6328 gets our TLS handshake back on track for being able to blend in with
6329 Firefox, fixes a big bug in 0.2.3.16-alpha that broke Tor's interaction
6330 with Vidalia, and otherwise continues to get us closer to a release
6334 - Enable gcc and ld hardening by default. Resolves ticket 5210.
6335 - Update TLS cipher list to match Firefox 8 and later. Resolves
6337 - Implement the client side of proposal 198: remove support for
6338 clients falsely claiming to support standard ciphersuites that
6339 they can actually provide. As of modern OpenSSL versions, it's not
6340 necessary to fake any standard ciphersuite, and doing so prevents
6341 us from using better ciphersuites in the future, since servers
6342 can't know whether an advertised ciphersuite is really supported or
6343 not. Some hosts -- notably, ones with very old versions of OpenSSL
6344 or where OpenSSL has been built with ECC disabled -- will stand
6345 out because of this change; TBB users should not be affected.
6348 - Change the default value for DynamicDHGroups (introduced in
6349 0.2.3.9-alpha) to 0. This feature can make Tor relays less
6350 identifiable by their use of the mod_ssl DH group, but at
6351 the cost of some usability (#4721) and bridge tracing (#6087)
6352 regressions. Resolves ticket 5598.
6353 - Send a CRLF at the end of each STATUS_* control protocol event. This
6354 bug tickled a bug in Vidalia which would make it freeze. Fixes
6355 bug 6094; bugfix on 0.2.3.16-alpha.
6358 - Disable writing on marked-for-close connections when they are
6359 blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
6360 bug 5263; bugfix on 0.0.2pre13, where we first added a special
6361 case for flushing marked connections.
6362 - Detect SSL handshake even when the initial attempt to write the
6363 server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
6364 - Change the AllowDotExit rules so they should actually work.
6365 We now enforce AllowDotExit only immediately after receiving an
6366 address via SOCKS or DNSPort: other sources are free to provide
6367 .exit addresses after the resolution occurs. Fixes bug 3940;
6368 bugfix on 0.2.2.1-alpha.
6369 - Fix a (harmless) integer overflow in cell statistics reported by
6370 some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
6371 - Make sure circuitbuild.c checks LearnCircuitBuildTimeout in all the
6372 right places and never depends on the consensus parameters or
6373 computes adaptive timeouts when it is disabled. Fixes bug 5049;
6374 bugfix on 0.2.2.14-alpha.
6375 - When building Tor on Windows with -DUNICODE (not default), ensure
6376 that error messages, filenames, and DNS server names are always
6377 NUL-terminated when we convert them to a single-byte encoding.
6378 Fixes bug 5909; bugfix on 0.2.2.16-alpha.
6379 - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
6380 Fixes bug 6097; bugfix on 0.2.2.16-alpha.
6381 - Fix an edge case where TestingTorNetwork is set but the authorities
6382 and relays all have an uptime of zero, where the private Tor network
6383 could briefly lack support for hidden services. Fixes bug 3886;
6384 bugfix on 0.2.2.18-alpha.
6385 - Correct the manpage's descriptions for the default values of
6386 DirReqStatistics and ExtraInfoStatistics. Fixes bug 2865; bugfix
6388 - Fix the documentation for the --hush and --quiet command line
6389 options, which changed their behavior back in 0.2.3.3-alpha.
6390 - Fix compilation warning with clang 3.1. Fixes bug 6141; bugfix on
6394 - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
6395 more information to it, so that we can track it down in case it
6396 returns again. Mitigates bug 5235.
6397 - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
6398 options_validate(); warn if LearnCircuitBuildTimeout is disabled and
6399 CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
6400 - Warn the user when HTTPProxy, but no other proxy type, is
6401 configured. This can cause surprising behavior: it doesn't send
6402 all of Tor's traffic over the HTTPProxy -- it sends unencrypted
6403 directory traffic only. Resolves ticket 4663.
6404 - Issue a notice if a guard completes less than 40% of your circuits.
6405 Threshold is configurable by torrc option PathBiasNoticeRate and
6406 consensus parameter pb_noticepct. There is additional, off-by-
6407 default code to disable guards which fail too many circuits.
6408 Addresses ticket 5458.
6409 - Update to the June 6 2012 Maxmind GeoLite Country database.
6411 o Code simplifications and refactoring:
6412 - Remove validate_pluggable_transports_config(): its warning
6413 message is now handled by connection_or_connect().
6416 Changes in version 0.2.2.37 - 2012-06-06
6417 Tor 0.2.2.37 introduces a workaround for a critical renegotiation
6418 bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
6422 - Work around a bug in OpenSSL that broke renegotiation with TLS
6423 1.1 and TLS 1.2. Without this workaround, all attempts to speak
6424 the v2 Tor connection protocol when both sides were using OpenSSL
6425 1.0.1 would fail. Resolves ticket 6033.
6426 - When waiting for a client to renegotiate, don't allow it to add
6427 any bytes to the input buffer. This fixes a potential DoS issue.
6428 Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
6429 - Fix an edge case where if we fetch or publish a hidden service
6430 descriptor, we might build a 4-hop circuit and then use that circuit
6431 for exiting afterwards -- even if the new last hop doesn't obey our
6432 ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
6435 - Fix a build warning with Clang 3.1 related to our use of vasprintf.
6436 Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
6439 - Tell GCC and Clang to check for any errors in format strings passed
6440 to the tor_v*(print|scan)f functions.
6443 Changes in version 0.2.3.16-alpha - 2012-06-05
6444 Tor 0.2.3.16-alpha introduces a workaround for a critical renegotiation
6445 bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
6446 currently). It also fixes a variety of smaller bugs and other cleanups
6447 that get us closer to a release candidate.
6449 o Major bugfixes (general):
6450 - Work around a bug in OpenSSL that broke renegotiation with TLS
6451 1.1 and TLS 1.2. Without this workaround, all attempts to speak
6452 the v2 Tor connection protocol when both sides were using OpenSSL
6453 1.0.1 would fail. Resolves ticket 6033.
6454 - When waiting for a client to renegotiate, don't allow it to add
6455 any bytes to the input buffer. This fixes a potential DoS issue.
6456 Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
6457 - Pass correct OR address to managed proxies (like obfsproxy),
6458 even when ORListenAddress is used. Fixes bug 4865; bugfix on
6460 - The advertised platform of a router now includes only its operating
6461 system's name (e.g., "Linux", "Darwin", "Windows 7"), and not its
6462 service pack level (for Windows) or its CPU architecture (for Unix).
6463 We also no longer include the "git-XYZ" tag in the version. Resolves
6466 o Major bugfixes (clients):
6467 - If we are unable to find any exit that supports our predicted ports,
6468 stop calling them predicted, so that we don't loop and build
6469 hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
6470 which introduced predicted ports.
6471 - Fix an edge case where if we fetch or publish a hidden service
6472 descriptor, we might build a 4-hop circuit and then use that circuit
6473 for exiting afterwards -- even if the new last hop doesn't obey our
6474 ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
6475 - Check at each new consensus whether our entry guards were picked
6476 long enough ago that we should rotate them. Previously, we only
6477 did this check at startup, which could lead to us holding a guard
6478 indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
6479 - When fetching a bridge descriptor from a bridge authority,
6480 always do so anonymously, whether we have been able to open
6481 circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
6482 This behavior makes it *safer* to use UpdateBridgesFromAuthority,
6483 but we'll need to wait for bug 6010 before it's actually usable.
6485 o Major bugfixes (directory authorities):
6486 - When computing weight parameters, behave more robustly in the
6487 presence of a bad bwweightscale value. Previously, the authorities
6488 would crash if they agreed on a sufficiently broken weight_scale
6489 value: now, they use a reasonable default and carry on. Partial
6490 fix for 5786; bugfix on 0.2.2.17-alpha.
6491 - Check more thoroughly to prevent a rogue authority from
6492 double-voting on any consensus directory parameter. Previously,
6493 authorities would crash in this case if the total number of
6494 votes for any parameter exceeded the number of active voters,
6495 but would let it pass otherwise. Partial fix for bug 5786; bugfix
6499 - Rate-limit log messages when asked to connect anonymously to
6500 a private address. When these hit, they tended to hit fast and
6501 often. Also, don't bother trying to connect to addresses that we
6502 are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
6503 reply makes us think we have been lied to, even when the address the
6504 client tried to connect to was "localhost." Resolves ticket 2822.
6505 - Allow packagers to insert an extra string in server descriptor
6506 platform lines by setting the preprocessor variable TOR_BUILD_TAG.
6507 Resolves the rest of ticket 2988.
6508 - Raise the threshold of server descriptors needed (75%) and exit
6509 server descriptors needed (50%) before we will declare ourselves
6510 bootstrapped. This will make clients start building circuits a
6511 little later, but makes the initially constructed circuits less
6512 skewed and less in conflict with further directory fetches. Fixes
6514 - Close any connection that sends unrecognized junk before the
6515 handshake. Solves an issue noted in bug 4369.
6516 - Improve log messages about managed transports. Resolves ticket 5070.
6517 - Tag a bridge's descriptor as "never to be sent unencrypted".
6518 This shouldn't matter, since bridges don't open non-anonymous
6519 connections to the bridge authority and don't allow unencrypted
6520 directory connections from clients, but we might as well make
6521 sure. Closes bug 5139.
6522 - Expose our view of whether we have gone dormant to the controller,
6523 via a new "GETINFO dormant" value. Torbutton and other controllers
6524 can use this to avoid doing periodic requests through Tor while
6525 it's dormant (bug 4718). Fixes bug 5954.
6526 - Tell GCC and Clang to check for any errors in format strings passed
6527 to the tor_v*(print|scan)f functions.
6528 - Update to the May 1 2012 Maxmind GeoLite Country database.
6530 o Minor bugfixes (already included in 0.2.2.36):
6531 - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
6532 Fixes bug 5346; bugfix on 0.0.8pre3.
6533 - Correct parsing of certain date types in parse_http_time().
6534 Without this patch, If-Modified-Since would behave
6535 incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
6536 Esteban Manchado Velázques.
6537 - Make our number-parsing functions always treat too-large values
6538 as an error, even when those values exceed the width of the
6539 underlying type. Previously, if the caller provided these
6540 functions with minima or maxima set to the extreme values of the
6541 underlying integer type, these functions would return those
6542 values on overflow rather than treating overflow as an error.
6543 Fixes part of bug 5786; bugfix on 0.0.9.
6544 - If we hit the error case where routerlist_insert() replaces an
6545 existing (old) server descriptor, make sure to remove that
6546 server descriptor from the old_routers list. Fix related to bug
6547 1776. Bugfix on 0.2.2.18-alpha.
6548 - Clarify the behavior of MaxCircuitDirtiness with hidden service
6549 circuits. Fixes issue 5259.
6551 o Minor bugfixes (coding cleanup, on 0.2.2.x and earlier):
6552 - Prevent a null-pointer dereference when receiving a data cell
6553 for a nonexistent stream when the circuit in question has an
6554 empty deliver window. We don't believe this is triggerable,
6555 since we don't currently allow deliver windows to become empty,
6556 but the logic is tricky enough that it's better to make the code
6557 robust. Fixes bug 5541; bugfix on 0.0.2pre14.
6558 - Fix a memory leak when trying to launch a DNS request when the
6559 network is disabled or the nameservers are unconfigurable. Fixes
6560 bug 5916; bugfix on Tor 0.1.2.1-alpha (for the unconfigurable
6561 nameserver case) and on 0.2.3.9-alpha (for the DisableNetwork case).
6562 - Don't hold a Windows file handle open for every file mapping;
6563 the file mapping handle is sufficient. Fixes bug 5951; bugfix on
6565 - Avoid O(n^2) performance characteristics when parsing a large
6566 extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
6567 - Format more doubles with %f, not %lf. Patch from grarpamp to make
6568 Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
6570 - Make our replacement implementation of strtok_r() compatible with
6571 the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
6572 bugfix on 0.2.2.1-alpha.
6573 - Fix a NULL-pointer dereference on a badly formed
6574 SETCIRCUITPURPOSE command. Found by mikeyc. Fixes bug 5796;
6575 bugfix on 0.2.2.9-alpha.
6576 - Fix a build warning with Clang 3.1 related to our use of vasprintf.
6577 Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
6578 - Defensively refactor rend_mid_rendezvous() so that protocol
6579 violations and length checks happen in the beginning. Fixes
6581 - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
6582 that IPv6 stuff will compile on MSVC, and compilation issues
6583 will be easier to track down. Fixes bug 5861.
6585 o Minor bugfixes (correctness, on 0.2.2.x and earlier):
6586 - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
6587 resource exhaustion, so that clients can adjust their load to
6588 try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
6589 started using END_STREAM_REASON_RESOURCELIMIT.
6590 - Don't check for whether the address we're using for outbound
6591 connections has changed until after the outbound connection has
6592 completed. On Windows, getsockname() doesn't succeed until the
6593 connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
6594 - If the configuration tries to set MyFamily on a bridge, refuse to
6595 do so, and warn about the security implications. Fixes bug 4657;
6596 bugfix on 0.2.0.3-alpha.
6597 - If the client fails to set a reasonable set of ciphersuites
6598 during its v2 handshake renegotiation, allow the renegotiation to
6599 continue nevertheless (i.e. send all the required certificates).
6600 Fixes bug 4591; bugfix on 0.2.0.20-rc.
6601 - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
6602 option is set to 0 (which Vidalia version 0.2.16 now does when
6603 a SAVECONF attempt fails), perform other actions that SIGHUP
6604 usually causes (like reopening the logs). Fixes bug 5095; bugfix
6606 - If we fail to write a microdescriptor to the disk cache, do not
6607 continue replacing the old microdescriptor file. Fixes bug 2954;
6608 bugfix on 0.2.2.6-alpha.
6609 - Exit nodes don't need to fetch certificates for authorities that
6610 they don't recognize; only directory authorities, bridges,
6611 and caches need to do that. Fixes part of bug 2297; bugfix on
6613 - Correctly handle checking the permissions on the parent
6614 directory of a control socket in the root directory. Bug found
6615 by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
6617 - When told to add a bridge with the same digest as a preexisting
6618 bridge but a different addr:port, change the addr:port as
6619 requested. Previously we would not notice the change. Fixes half
6620 of bug 5603; fix on 0.2.2.26-beta.
6621 - End AUTHCHALLENGE error messages (in the control protocol) with
6622 a CRLF. Fixes bug 5760; bugfix on 0.2.2.36 and 0.2.3.13-alpha.
6624 o Minor bugfixes (on 0.2.3.x):
6625 - Turn an assertion (that the number of handshakes received as a
6626 server is not < 1) into a warning. Fixes bug 4873; bugfix on
6628 - Format IPv4 addresses correctly in ADDRMAP events. (Previously,
6629 we had reversed them when the answer was cached.) Fixes bug
6630 5723; bugfix on 0.2.3.1-alpha.
6631 - Work correctly on Linux systems with accept4 support advertised in
6632 their headers, but without accept4 support in the kernel. Fix
6633 by murb. Fixes bug 5762; bugfix on 0.2.3.1-alpha.
6634 - When told to add a bridge with the same addr:port as a preexisting
6635 bridge but a different transport, change the transport as
6636 requested. Previously we would not notice the change. Fixes half
6637 of bug 5603; fix on 0.2.3.2-alpha.
6638 - Avoid a "double-reply" warning when replying to a SOCKS request
6639 with a parse error. Patch from Fabian Keil. Fixes bug 4108;
6640 bugfix on 0.2.3.4-alpha.
6641 - Fix a bug where a bridge authority crashes if it has seen no
6642 directory requests when it's time to write statistics to disk.
6643 Fixes bug 5891; bugfix on 0.2.3.6-alpha. Also fixes bug 5508 in
6645 - Don't try to open non-control listeners when DisableNetwork is set.
6646 Previously, we'd open all listeners, then immediately close them.
6647 Fixes bug 5604; bugfix on 0.2.3.9-alpha.
6648 - Don't abort the managed proxy protocol if the managed proxy
6649 sends us an unrecognized line; ignore it instead. Fixes bug
6650 5910; bugfix on 0.2.3.9-alpha.
6651 - Fix a compile warning in crypto.c when compiling with clang 3.1.
6652 Fixes bug 5969, bugfix on 0.2.3.9-alpha.
6653 - Fix a compilation issue on GNU Hurd, which doesn't have PATH_MAX.
6654 Fixes bug 5355; bugfix on 0.2.3.11-alpha.
6655 - Remove bogus definition of "_WIN32" from src/win32/orconfig.h, to
6656 unbreak the MSVC build. Fixes bug 5858; bugfix on 0.2.3.12-alpha.
6657 - Resolve numerous small warnings and build issues with MSVC. Resolves
6660 o Documentation fixes:
6661 - Improve the manual's documentation for the NT Service command-line
6662 options. Addresses ticket 3964.
6663 - Clarify SessionGroup documentation slightly; resolves ticket 5437.
6664 - Document the changes to the ORPort and DirPort options, and the
6665 fact that {OR/Dir}ListenAddress is now unnecessary (and
6666 therefore deprecated). Resolves ticket 5597.
6669 - Remove the torrc.bridge file: we don't use it for anything, and
6670 it had become badly desynchronized from torrc.sample. Resolves
6674 Changes in version 0.2.2.36 - 2012-05-24
6675 Tor 0.2.2.36 updates the addresses for two of the eight directory
6676 authorities, fixes some potential anonymity and security issues,
6677 and fixes several crash bugs.
6679 Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
6680 known flaws, and nobody should be using them. You should upgrade. If
6681 you're using a Linux or BSD and its packages are obsolete, stop using
6682 those packages and upgrade anyway.
6684 o Directory authority changes:
6685 - Change IP address for maatuska (v3 directory authority).
6686 - Change IP address for ides (v3 directory authority), and rename
6690 - When building or running with any version of OpenSSL earlier
6691 than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
6692 versions have a bug (CVE-2011-4576) in which their block cipher
6693 padding includes uninitialized data, potentially leaking sensitive
6694 information to any peer with whom they make a SSLv3 connection. Tor
6695 does not use SSL v3 by default, but a hostile client or server
6696 could force an SSLv3 connection in order to gain information that
6697 they shouldn't have been able to get. The best solution here is to
6698 upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
6699 or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
6700 to make sure that the bug can't happen.
6701 - Never use a bridge or a controller-supplied node as an exit, even
6702 if its exit policy allows it. Found by wanoskarnet. Fixes bug
6703 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
6704 and 0.2.0.3-alpha (for bridge-purpose descriptors).
6705 - Only build circuits if we have a sufficient threshold of the total
6706 descriptors that are marked in the consensus with the "Exit"
6707 flag. This mitigates an attack proposed by wanoskarnet, in which
6708 all of a client's bridges collude to restrict the exit nodes that
6709 the client knows about. Fixes bug 5343.
6710 - Provide controllers with a safer way to implement the cookie
6711 authentication mechanism. With the old method, if another locally
6712 running program could convince a controller that it was the Tor
6713 process, then that program could trick the controller into telling
6714 it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
6715 authentication method uses a challenge-response approach to prevent
6716 this attack. Fixes bug 5185; implements proposal 193.
6719 - Avoid logging uninitialized data when unable to decode a hidden
6720 service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
6721 - Avoid a client-side assertion failure when receiving an INTRODUCE2
6722 cell on a general purpose circuit. Fixes bug 5644; bugfix on
6724 - Fix builds when the path to sed, openssl, or sha1sum contains
6725 spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
6727 - Correct our replacements for the timeradd() and timersub() functions
6728 on platforms that lack them (for example, Windows). The timersub()
6729 function is used when expiring circuits, while timeradd() is
6730 currently unused. Bug report and patch by Vektor. Fixes bug 4778;
6731 bugfix on 0.2.2.24-alpha.
6732 - Fix the SOCKET_OK test that we use to tell when socket
6733 creation fails so that it works on Win64. Fixes part of bug 4533;
6734 bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
6737 - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
6738 Fixes bug 5346; bugfix on 0.0.8pre3.
6739 - Make our number-parsing functions always treat too-large values
6740 as an error, even when those values exceed the width of the
6741 underlying type. Previously, if the caller provided these
6742 functions with minima or maxima set to the extreme values of the
6743 underlying integer type, these functions would return those
6744 values on overflow rather than treating overflow as an error.
6745 Fixes part of bug 5786; bugfix on 0.0.9.
6746 - Older Linux kernels erroneously respond to strange nmap behavior
6747 by having accept() return successfully with a zero-length
6748 socket. When this happens, just close the connection. Previously,
6749 we would try harder to learn the remote address: but there was
6750 no such remote address to learn, and our method for trying to
6751 learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
6752 on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
6753 - Correct parsing of certain date types in parse_http_time().
6754 Without this patch, If-Modified-Since would behave
6755 incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
6756 Esteban Manchado Velázques.
6757 - Change the BridgePassword feature (part of the "bridge community"
6758 design, which is not yet implemented) to use a time-independent
6759 comparison. The old behavior might have allowed an adversary
6760 to use timing to guess the BridgePassword value. Fixes bug 5543;
6761 bugfix on 0.2.0.14-alpha.
6762 - Detect and reject certain misformed escape sequences in
6763 configuration values. Previously, these values would cause us
6764 to crash if received in a torrc file or over an authenticated
6765 control port. Bug found by Esteban Manchado Velázquez, and
6766 independently by Robert Connolly from Matta Consulting who further
6767 noted that it allows a post-authentication heap overflow. Patch
6768 by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
6769 bugfix on 0.2.0.16-alpha.
6770 - Fix a compile warning when using the --enable-openbsd-malloc
6771 configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
6772 - During configure, detect when we're building with clang version
6773 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
6774 CFLAGS. clang doesn't support them yet.
6775 - When sending an HTTP/1.1 proxy request, include a Host header.
6776 Fixes bug 5593; bugfix on 0.2.2.1-alpha.
6777 - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
6778 command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
6779 - If we hit the error case where routerlist_insert() replaces an
6780 existing (old) server descriptor, make sure to remove that
6781 server descriptor from the old_routers list. Fix related to bug
6782 1776. Bugfix on 0.2.2.18-alpha.
6784 o Minor bugfixes (documentation and log messages):
6785 - Fix a typo in a log message in rend_service_rendezvous_has_opened().
6786 Fixes bug 4856; bugfix on Tor 0.0.6.
6787 - Update "ClientOnly" man page entry to explain that there isn't
6788 really any point to messing with it. Resolves ticket 5005.
6789 - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
6790 directory authority option (introduced in Tor 0.2.2.34).
6791 - Downgrade the "We're missing a certificate" message from notice
6792 to info: people kept mistaking it for a real problem, whereas it
6793 is seldom the problem even when we are failing to bootstrap. Fixes
6794 bug 5067; bugfix on 0.2.0.10-alpha.
6795 - Correctly spell "connect" in a log message on failure to create a
6796 controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
6797 - Clarify the behavior of MaxCircuitDirtiness with hidden service
6798 circuits. Fixes issue 5259.
6801 - Directory authorities now reject versions of Tor older than
6802 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
6803 inclusive. These versions accounted for only a small fraction of
6804 the Tor network, and have numerous known security issues. Resolves
6806 - Update to the May 1 2012 Maxmind GeoLite Country database.
6809 - When sending or relaying a RELAY_EARLY cell, we used to convert
6810 it to a RELAY cell if the connection was using the v1 link
6811 protocol. This was a workaround for older versions of Tor, which
6812 didn't handle RELAY_EARLY cells properly. Now that all supported
6813 versions can handle RELAY_EARLY cells, and now that we're enforcing
6814 the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
6815 remove this workaround. Addresses bug 4786.
6818 Changes in version 0.2.3.15-alpha - 2012-04-30
6819 Tor 0.2.3.15-alpha fixes a variety of smaller bugs, including making
6820 the development branch build on Windows again.
6822 o Minor bugfixes (on 0.2.2.x and earlier):
6823 - Make sure that there are no unhandled pending TLS errors before
6824 reading from a TLS stream. We had checks in 0.1.0.3-rc, but
6825 lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
6826 Bugfix on 0.1.0.5-rc; fixes bug 4528.
6827 - Fix an assert that directory authorities could trigger on sighup
6828 during some configuration state transitions. We now don't treat
6829 it as a fatal error when the new descriptor we just generated in
6830 init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
6831 - After we pick a directory mirror, we would refuse to use it if
6832 it's in our ExcludeExitNodes list, resulting in mysterious failures
6833 to bootstrap for people who just wanted to avoid exiting from
6834 certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
6835 - When building with --enable-static-tor on OpenBSD, do not
6836 erroneously attempt to link -lrt. Fixes bug 5103.
6838 o Minor bugfixes (on 0.2.3.x):
6839 - When Tor is built with kernel headers from a recent (last few
6840 years) Linux kernel, do not fail to run on older (pre-2.6.28
6841 Linux kernels). Fixes bug 5112; bugfix on 0.2.3.1-alpha.
6842 - Fix cross-compilation issues with mingw. Bugfixes on 0.2.3.6-alpha
6844 - Fix compilation with miniupnpc version 1.6; patch from
6845 Anthony G. Basile. Fixes bug 5434; bugfix on 0.2.3.12-alpha.
6846 - Fix compilation with MSVC, which had defined MS_WINDOWS. Bugfix
6847 on 0.2.3.13-alpha; found and fixed by Gisle Vanem.
6848 - Fix compilation on platforms without unistd.h, or where environ
6849 is defined in stdlib.h. Fixes bug 5704; bugfix on 0.2.3.13-alpha.
6852 - Directory authorities are now a little more lenient at accepting
6853 older router descriptors, or newer router descriptors that don't
6854 make big changes. This should help ameliorate past and future
6855 issues where routers think they have uploaded valid descriptors,
6856 but the authorities don't think so. Fix for ticket 2479.
6857 - Make the code that clients use to detect an address change be
6858 IPv6-aware, so that it won't fill clients' logs with error
6859 messages when trying to get the IPv4 address of an IPv6
6860 connection. Implements ticket 5537.
6863 - Remove the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays option;
6864 authorities needed to use it for a while to keep the network working
6865 as people upgraded to 0.2.1.31, 0.2.2.34, or 0.2.3.6-alpha, but
6866 that was six months ago. As of now, it should no longer be needed
6870 Changes in version 0.2.3.14-alpha - 2012-04-23
6871 Tor 0.2.3.14-alpha fixes yet more bugs to get us closer to a release
6872 candidate. It also dramatically speeds up AES: fast relays should
6873 consider switching to the newer OpenSSL library.
6875 o Directory authority changes:
6876 - Change IP address for ides (v3 directory authority), and rename
6880 - Avoid logging uninitialized data when unable to decode a hidden
6881 service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
6882 - Avoid a client-side assertion failure when receiving an INTRODUCE2
6883 cell on a general purpose circuit. Fixes bug 5644; bugfix on
6885 - If authorities are unable to get a v2 consensus document from other
6886 directory authorities, they no longer fall back to fetching
6887 them from regular directory caches. Fixes bug 5635; bugfix on
6888 0.2.2.26-beta, where routers stopped downloading v2 consensus
6890 - When we start a Tor client with a normal consensus already cached,
6891 be willing to download a microdescriptor consensus. Fixes bug 4011;
6892 fix on 0.2.3.1-alpha.
6894 o Major features (performance):
6895 - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
6896 instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
6897 vectorized AES implementations as appropriate. These can be much,
6898 much faster than other AES implementations.
6900 o Minor bugfixes (0.2.2.x and earlier):
6901 - Don't launch more than 10 service-side introduction-point circuits
6902 for a hidden service in five minutes. Previously, we would consider
6903 launching more introduction-point circuits if at least one second
6904 had passed without any introduction-point circuits failing. Fixes
6905 bug 4607; bugfix on 0.0.7pre1.
6906 - Change the BridgePassword feature (part of the "bridge community"
6907 design, which is not yet implemented) to use a time-independent
6908 comparison. The old behavior might have allowed an adversary
6909 to use timing to guess the BridgePassword value. Fixes bug 5543;
6910 bugfix on 0.2.0.14-alpha.
6911 - Enforce correct return behavior of tor_vsscanf() when the '%%'
6912 pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
6913 - When sending an HTTP/1.1 proxy request, include a Host header.
6914 Fixes bug 5593; bugfix on 0.2.2.1-alpha.
6915 - Don't log that we have "decided to publish new relay descriptor"
6916 unless we are actually publishing a descriptor. Fixes bug 3942;
6917 bugfix on 0.2.2.28-beta.
6919 o Minor bugfixes (0.2.3.x):
6920 - Fix a bug where a bridge authority crashes (on a failed assert)
6921 if it has seen no directory requests when it's time to write
6922 statistics to disk. Fixes bug 5508. Bugfix on 0.2.3.6-alpha.
6923 - Fix bug stomping on ORPort option NoListen and ignoring option
6924 NoAdvertise. Fixes bug 5151; bugfix on 0.2.3.9-alpha.
6925 - In the testsuite, provide a large enough buffer in the tor_sscanf
6926 unit test. Otherwise we'd overrun that buffer and crash during
6927 the unit tests. Found by weasel. Fixes bug 5449; bugfix on
6929 - Make sure we create the keys directory if it doesn't exist and we're
6930 about to store the dynamic Diffie-Hellman parameters. Fixes bug
6931 5572; bugfix on 0.2.3.13-alpha.
6932 - Fix a small memory leak when trying to decode incorrect base16
6933 authenticator during SAFECOOKIE authentication. Found by
6934 Coverity Scan. Fixes CID 507. Bugfix on 0.2.3.13-alpha.
6937 - Add more information to a log statement that might help track down
6938 bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
6939 non-IP address" messages (or any Bug messages, for that matter!),
6940 please let us know about it.
6941 - Relays now understand an IPv6 address when they get one from a
6942 directory server. Resolves ticket 4875.
6943 - Resolve IPv6 addresses in bridge and entry statistics to country
6944 code "??" which means we at least count them. Resolves ticket 5053;
6945 improves on 0.2.3.9-alpha.
6946 - Update to the April 3 2012 Maxmind GeoLite Country database.
6947 - Begin a doc/state-contents.txt file to explain the contents of
6948 the Tor state file. Fixes bug 2987.
6950 o Default torrc changes:
6951 - Stop listing "socksport 9050" in torrc.sample. We open a socks
6952 port on 9050 by default anyway, so this should not change anything
6954 - Stop mentioning the deprecated *ListenAddress options in
6955 torrc.sample. Fixes bug 5438.
6956 - Document unit of bandwidth related options in sample torrc.
6960 - The "torify" script no longer supports the "tsocks" socksifier
6961 tool, since tsocks doesn't support DNS and UDP right for Tor.
6962 Everyone should be using torsocks instead. Fixes bugs 3530 and
6963 5180. Based on a patch by "ugh".
6966 - Change the symmetric cipher interface so that creating and
6967 initializing a stream cipher are no longer separate functions.
6968 - Remove all internal support for unpadded RSA. We never used it, and
6969 it would be a bad idea to start.
6972 Changes in version 0.2.3.13-alpha - 2012-03-26
6973 Tor 0.2.3.13-alpha fixes a variety of stability and correctness bugs
6974 in managed pluggable transports, as well as providing other cleanups
6975 that get us closer to a release candidate.
6977 o Directory authority changes:
6978 - Change IP address for maatuska (v3 directory authority).
6981 - Provide controllers with a safer way to implement the cookie
6982 authentication mechanism. With the old method, if another locally
6983 running program could convince a controller that it was the Tor
6984 process, then that program could trick the controller into telling
6985 it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
6986 authentication method uses a challenge-response approach to prevent
6987 this attack. Fixes bug 5185, implements proposal 193.
6988 - Never use a bridge or a controller-supplied node as an exit, even
6989 if its exit policy allows it. Found by wanoskarnet. Fixes bug
6990 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
6991 and 0.2.0.3-alpha (for bridge-purpose descriptors).
6992 - Only build circuits if we have a sufficient threshold of the total
6993 descriptors that are marked in the consensus with the "Exit"
6994 flag. This mitigates an attack proposed by wanoskarnet, in which
6995 all of a client's bridges collude to restrict the exit nodes that
6996 the client knows about. Fixes bug 5343.
6998 o Major bugfixes (on Tor 0.2.3.x):
6999 - Avoid an assert when managed proxies like obfsproxy are configured,
7000 and we receive HUP signals or setconf attempts too rapidly. This
7001 situation happens most commonly when Vidalia tries to attach to
7002 Tor or tries to configure the Tor it's attached to. Fixes bug 5084;
7003 bugfix on 0.2.3.6-alpha.
7004 - Fix a relay-side pluggable transports bug where managed proxies were
7005 unreachable from the Internet, because Tor asked them to bind on
7006 localhost. Fixes bug 4725; bugfix on 0.2.3.9-alpha.
7007 - Stop discarding command-line arguments when TestingTorNetwork
7008 is set. Discovered by Kevin Bauer. Fixes bug 5373; bugfix on
7009 0.2.3.9-alpha, where task 4552 added support for two layers of
7011 - Resume allowing the unit tests to run in gdb. This was accidentally
7012 made impossible when the DisableDebuggerAttachment option was
7013 introduced. Fixes bug 5448; bugfix on 0.2.3.9-alpha.
7014 - Resume building with nat-pmp support. Fixes bug 4955; bugfix on
7015 0.2.3.11-alpha. Reported by Anthony G. Basile.
7017 o Minor bugfixes (on 0.2.2.x and earlier):
7018 - Ensure we don't cannibalize circuits that are longer than three hops
7019 already, so we don't end up making circuits with 5 or more
7020 hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
7021 0.1.0.1-rc which introduced cannibalization.
7022 - Detect and reject certain misformed escape sequences in
7023 configuration values. Previously, these values would cause us
7024 to crash if received in a torrc file or over an authenticated
7025 control port. Bug found by Esteban Manchado Velázquez, and
7026 independently by Robert Connolly from Matta Consulting who further
7027 noted that it allows a post-authentication heap overflow. Patch
7028 by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
7029 bugfix on 0.2.0.16-alpha.
7030 - Fix a compile warning when using the --enable-openbsd-malloc
7031 configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
7032 - Directory caches no longer refuse to clean out descriptors because
7033 of missing v2 networkstatus documents, unless they're configured
7034 to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
7035 0.2.2.26-beta. Patch by Daniel Bryg.
7036 - Update to the latest version of the tinytest unit testing framework.
7037 This includes a couple of bugfixes that can be relevant for
7038 running forked unit tests on Windows, and removes all reserved
7041 o Minor bugfixes (on 0.2.3.x):
7042 - On a failed pipe() call, don't leak file descriptors. Fixes bug
7043 4296; bugfix on 0.2.3.1-alpha.
7044 - Spec conformance: on a v3 handshake, do not send a NETINFO cell
7045 until after we have received a CERTS cell. Fixes bug 4361; bugfix
7046 on 0.2.3.6-alpha. Patch by "frosty".
7047 - When binding to an IPv6 address, set the IPV6_V6ONLY socket
7048 option, so that the IP stack doesn't decide to use it for IPv4
7049 too. Fixes bug 4760; bugfix on 0.2.3.9-alpha.
7050 - Ensure that variables set in Tor's environment cannot override
7051 environment variables that Tor passes to a managed
7052 pluggable-transport proxy. Previously, Tor would pass every
7053 variable in its environment to managed proxies along with the new
7054 ones, in such a way that on many operating systems, the inherited
7055 environment variables would override those which Tor tried to
7056 explicitly set. Bugfix on 0.2.3.12-alpha for most Unixoid systems;
7057 bugfix on 0.2.3.9-alpha for Windows.
7060 - A wide variety of new unit tests by Esteban Manchado Velázquez.
7061 - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
7062 - Update to the March 6 2012 Maxmind GeoLite Country database.
7065 Changes in version 0.2.3.12-alpha - 2012-02-13
7066 Tor 0.2.3.12-alpha lets fast exit relays scale better, allows clients
7067 to use bridges that run Tor 0.2.2.x, and resolves several big bugs
7068 when Tor is configured to use a pluggable transport like obfsproxy.
7071 - Fix builds when the path to sed, openssl, or sha1sum contains
7072 spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
7074 - Set the SO_REUSEADDR socket option before we call bind() on outgoing
7075 connections. This change should allow busy exit relays to stop
7076 running out of available sockets as quickly. Fixes bug 4950;
7077 bugfix on 0.2.2.26-beta.
7078 - Allow 0.2.3.x clients to use 0.2.2.x bridges. Previously the client
7079 would ask the bridge for microdescriptors, which are only supported
7080 in 0.2.3.x, and then fail to bootstrap when it didn't get the
7081 answers it wanted. Fixes bug 4013; bugfix on 0.2.3.2-alpha.
7082 - Properly set up obfsproxy's environment when in managed mode. The
7083 Tor Browser Bundle needs LD_LIBRARY_PATH to be passed to obfsproxy,
7084 and when you run your Tor as a daemon, there's no HOME. Fixes bugs
7085 5076 and 5082; bugfix on 0.2.3.6-alpha.
7088 - Use the dead_strip option when building Tor on OS X. This reduces
7089 binary size by almost 19% when linking openssl and libevent
7090 statically, which we do for Tor Browser Bundle.
7091 - Fix broken URLs in the sample torrc file, and tell readers about
7092 the OutboundBindAddress, ExitPolicyRejectPrivate, and
7093 PublishServerDescriptor options. Addresses bug 4652.
7094 - Update to the February 7 2012 Maxmind GeoLite Country database.
7097 - Downgrade the "We're missing a certificate" message from notice
7098 to info: people kept mistaking it for a real problem, whereas it
7099 is seldom the problem even when we are failing to bootstrap. Fixes
7100 bug 5067; bugfix on 0.2.0.10-alpha.
7101 - Don't put "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200" in a
7102 managed pluggable transport server proxy's environment.
7103 Previously, we would put it there, even though Tor doesn't
7104 implement an 'extended server port' yet, and even though Tor
7105 almost certainly isn't listening at that address. For now, we set
7106 it to an empty string to avoid crashing older obfsproxies. Bugfix
7108 - Log the heartbeat message every HeartbeatPeriod seconds, not every
7109 HeartbeatPeriod + 1 seconds. Fixes bug 4942; bugfix on
7110 0.2.3.1-alpha. Bug reported by Scott Bennett.
7111 - Calculate absolute paths correctly on Windows. Fixes bug 4973;
7112 bugfix on 0.2.3.11-alpha.
7113 - Update "ClientOnly" man page entry to explain that there isn't
7114 really any point to messing with it. Resolves ticket 5005.
7115 - Use the correct CVE number for CVE-2011-4576 in our comments and
7116 log messages. Found by "fermenthor". Resolves bug 5066; bugfix on
7119 o Code simplifications and refactoring:
7120 - Use the _WIN32 macro throughout our code to detect Windows.
7121 (Previously we had used the obsolete 'WIN32' and the idiosyncratic
7125 Changes in version 0.2.3.11-alpha - 2012-01-22
7126 Tor 0.2.3.11-alpha marks feature-freeze for the 0.2.3 tree. It deploys
7127 the last step of the plan to limit maximum circuit length, includes
7128 a wide variety of hidden service performance and correctness fixes,
7129 works around an OpenSSL security flaw if your distro is too stubborn
7130 to upgrade, and fixes a bunch of smaller issues.
7133 - Now that Tor 0.2.0.x is completely deprecated, enable the final
7134 part of "Proposal 110: Avoiding infinite length circuits" by
7135 refusing all circuit-extend requests that do not use a relay_early
7136 cell. This change helps Tor resist a class of denial-of-service
7137 attacks by limiting the maximum circuit length.
7138 - Adjust the number of introduction points that a hidden service
7139 will try to maintain based on how long its introduction points
7140 remain in use and how many introductions they handle. Fixes
7142 - Try to use system facilities for enumerating local interface
7143 addresses, before falling back to our old approach (which was
7144 binding a UDP socket, and calling getsockname() on it). That
7145 approach was scaring OS X users whose draconian firewall
7146 software warned about binding to UDP sockets, regardless of
7147 whether packets were sent. Now we try to use getifaddrs(),
7148 SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
7149 system supports. Resolves ticket 1827.
7151 o Major security workaround:
7152 - When building or running with any version of OpenSSL earlier
7153 than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
7154 versions have a bug (CVE-2011-4576) in which their block cipher
7155 padding includes uninitialized data, potentially leaking sensitive
7156 information to any peer with whom they make a SSLv3 connection. Tor
7157 does not use SSL v3 by default, but a hostile client or server
7158 could force an SSLv3 connection in order to gain information that
7159 they shouldn't have been able to get. The best solution here is to
7160 upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
7161 or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
7162 to make sure that the bug can't happen.
7165 - Fix the SOCKET_OK test that we use to tell when socket
7166 creation fails so that it works on Win64. Fixes part of bug 4533;
7167 bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
7168 - Correct our replacements for the timeradd() and timersub() functions
7169 on platforms that lack them (for example, Windows). The timersub()
7170 function is used when expiring circuits, while timeradd() is
7171 currently unused. Bug report and patch by Vektor. Fixes bug 4778;
7172 bugfix on 0.2.2.24-alpha and 0.2.3.1-alpha.
7173 - Do not use OpenSSL 1.0.0's counter mode: it has a critical bug
7174 that was fixed in OpenSSL 1.0.0a. We test for the counter mode
7175 bug at runtime, not compile time, because some distributions hack
7176 their OpenSSL to mis-report its version. Fixes bug 4779; bugfix
7177 on 0.2.3.9-alpha. Found by Pascal.
7179 o Minor features (controller):
7180 - Use absolute path names when reporting the torrc filename in the
7181 control protocol, so a controller can more easily find the torrc
7182 file. Resolves bug 1101.
7183 - Extend the control protocol to report flags that control a circuit's
7184 path selection in CIRC events and in replies to 'GETINFO
7185 circuit-status'. Implements part of ticket 2411.
7186 - Extend the control protocol to report the hidden service address
7187 and current state of a hidden-service-related circuit in CIRC
7188 events and in replies to 'GETINFO circuit-status'. Implements part
7190 - When reporting the path to the cookie file to the controller,
7191 give an absolute path. Resolves ticket 4881.
7192 - Allow controllers to request an event notification whenever a
7193 circuit is cannibalized or its purpose is changed. Implements
7194 part of ticket 3457.
7195 - Include the creation time of a circuit in CIRC and CIRC2
7196 control-port events and the list produced by the 'GETINFO
7197 circuit-status' control-port command.
7199 o Minor features (directory authorities):
7200 - Directory authorities now reject versions of Tor older than
7201 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
7202 inclusive. These versions accounted for only a small fraction of
7203 the Tor network, and have numerous known security issues. Resolves
7205 - Authority operators can now vote for all relays in a given
7206 set of countries to be BadDir/BadExit/Invalid/Rejected.
7207 - Provide two consensus parameters (FastFlagMinThreshold and
7208 FastFlagMaxThreshold) to control the range of allowable bandwidths
7209 for the Fast directory flag. These allow authorities to run
7210 experiments on appropriate requirements for being a "Fast" node.
7211 The AuthDirFastGuarantee config value still applies. Implements
7213 - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
7214 directory authority option (introduced in Tor 0.2.2.34).
7216 o Minor features (other):
7217 - Don't disable the DirPort when we cannot exceed our AccountingMax
7218 limit during this interval because the effective bandwidthrate is
7219 low enough. This is useful in a situation where AccountMax is only
7220 used as an additional safeguard or to provide statistics.
7221 - Prepend an informative header to generated dynamic_dh_params files.
7222 - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
7223 EntryNodes will have no effect. Resolves issue 2571.
7224 - Log more useful messages when we fail to disable debugger
7226 - Log which authority we're missing votes from when we go to fetch
7227 them from the other auths.
7228 - Log (at debug level) whenever a circuit's purpose is changed.
7229 - Add missing documentation for the MaxClientCircuitsPending,
7230 UseMicrodescriptors, UserspaceIOCPBuffers, and
7231 _UseFilteringSSLBufferevents options, all introduced during
7233 - Update to the January 3 2012 Maxmind GeoLite Country database.
7235 o Minor bugfixes (hidden services):
7236 - Don't close hidden service client circuits which have almost
7237 finished connecting to their destination when they reach
7238 the normal circuit-build timeout. Previously, we would close
7239 introduction circuits which are waiting for an acknowledgement
7240 from the introduction point, and rendezvous circuits which have
7241 been specified in an INTRODUCE1 cell sent to a hidden service,
7242 after the normal CBT. Now, we mark them as 'timed out', and launch
7243 another rendezvous attempt in parallel. This behavior change can
7244 be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
7245 option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
7246 - Don't close hidden-service-side rendezvous circuits when they
7247 reach the normal circuit-build timeout. This behavior change can
7248 be disabled using the new
7249 CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
7250 remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
7251 - Make sure we never mark the wrong rendezvous circuit as having
7252 had its introduction cell acknowleged by the introduction-point
7253 relay. Previously, when we received an INTRODUCE_ACK cell on a
7254 client-side hidden-service introduction circuit, we might have
7255 marked a rendezvous circuit other than the one we specified in
7256 the INTRODUCE1 cell as INTRO_ACKED, which would have produced
7257 a warning message and interfered with the hidden service
7258 connection-establishment process. Fixes bug 4759; bugfix on
7259 0.2.3.3-alpha, when we added the stream-isolation feature which
7260 might cause Tor to open multiple rendezvous circuits for the same
7262 - Don't trigger an assertion failure when we mark a new client-side
7263 hidden-service introduction circuit for close during the process
7264 of creating it. Fixes bug 4796; bugfix on 0.2.3.6-alpha. Reported
7267 o Minor bugfixes (log messages):
7268 - Correctly spell "connect" in a log message on failure to create a
7269 controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta and
7271 - Fix a typo in a log message in rend_service_rendezvous_has_opened().
7272 Fixes bug 4856; bugfix on Tor 0.0.6.
7273 - Fix the log message describing how we work around discovering
7274 that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
7275 4837; bugfix on 0.2.2.9-alpha.
7276 - When logging about a disallowed .exit name, do not also call it
7277 an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
7279 o Minor bugfixes (build fixes):
7280 - During configure, detect when we're building with clang version
7281 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
7282 CFLAGS. clang doesn't support them yet.
7283 - During configure, search for library containing cos function as
7284 libm lives in libcore on some platforms (BeOS/Haiku). Linking
7285 against libm was hard-coded before. Fixes the first part of bug
7286 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
7288 - Detect attempts to build Tor on (as yet hypothetical) versions
7289 of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
7290 fix for bug 4533. Bugfix on 0.2.2.28-beta.
7291 - Preprocessor directives should not be put inside the arguments
7292 of a macro. This would break compilation with GCC releases prior
7293 to version 3.3. We would never recommend such an old GCC version,
7294 but it is apparently required for binary compatibility on some
7295 platforms (namely, certain builds of Haiku). Fixes the other part
7296 of bug 4727; bugfix on 0.2.3.3-alpha. Patch and analysis by Martin
7299 o Minor bugfixes (other):
7300 - Older Linux kernels erroneously respond to strange nmap behavior
7301 by having accept() return successfully with a zero-length
7302 socket. When this happens, just close the connection. Previously,
7303 we would try harder to learn the remote address: but there was
7304 no such remote address to learn, and our method for trying to
7305 learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
7306 on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
7307 - Fix null-pointer access that could occur if TLS allocation failed.
7308 Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un". This was
7309 erroneously listed as fixed in 0.2.3.9-alpha, but the fix had
7310 accidentally been reverted.
7311 - Fix our implementation of crypto_random_hostname() so it can't
7312 overflow on ridiculously large inputs. (No Tor version has ever
7313 provided this kind of bad inputs, but let's be correct in depth.)
7314 Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
7315 - Find more places in the code that should have been testing for
7316 invalid sockets using the SOCKET_OK macro. Required for a fix
7317 for bug 4533. Bugfix on 0.2.2.28-beta.
7318 - Fix an assertion failure when, while running with bufferevents, a
7319 connection finishes connecting after it is marked for close, but
7320 before it is closed. Fixes bug 4697; bugfix on 0.2.3.1-alpha.
7321 - test_util_spawn_background_ok() hardcoded the expected value
7322 for ENOENT to 2. This isn't portable as error numbers are
7323 platform specific, and particularly the hurd has ENOENT at
7324 0x40000002. Construct expected string at runtime, using the correct
7325 value for ENOENT. Fixes bug 4733; bugfix on 0.2.3.1-alpha.
7326 - Reject attempts to disable DisableDebuggerAttachment while Tor is
7327 running. Fixes bug 4650; bugfix on 0.2.3.9-alpha.
7328 - Use an appropriate-width type for sockets in tor-fw-helper on
7329 win64. Fixes bug 1983 at last. Bugfix on 0.2.3.9-alpha.
7332 - When sending or relaying a RELAY_EARLY cell, we used to convert
7333 it to a RELAY cell if the connection was using the v1 link
7334 protocol. This was a workaround for older versions of Tor, which
7335 didn't handle RELAY_EARLY cells properly. Now that all supported
7336 versions can handle RELAY_EARLY cells, and now that we're enforcing
7337 the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
7338 remove this workaround. Addresses bug 4786.
7340 o Code simplifications and refactoring:
7341 - Use OpenSSL's built-in SSL_state_string_long() instead of our
7342 own homebrewed ssl_state_to_string() replacement. Patch from
7343 Emile Snyder. Fixes bug 4653.
7344 - Use macros to indicate OpenSSL versions, so we don't need to worry
7345 about accidental hexadecimal bit shifts.
7346 - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
7348 - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
7349 - Use the smartlist_add_asprintf() alias more consistently.
7350 - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
7351 invalid value, rather than just -1.
7352 - Rename a handful of old identifiers, mostly related to crypto
7353 structures and crypto functions. By convention, our "create an
7354 object" functions are called "type_new()", our "free an object"
7355 functions are called "type_free()", and our types indicate that
7356 they are types only with a final "_t". But a handful of older
7357 types and functions broke these rules, with function names like
7358 "type_create" or "subsystem_op_type", or with type names like
7362 Changes in version 0.2.3.10-alpha - 2011-12-16
7363 Tor 0.2.3.10-alpha fixes a critical heap-overflow security issue in
7364 Tor's buffers code. Absolutely everybody should upgrade.
7366 The bug relied on an incorrect calculation when making data continuous
7367 in one of our IO buffers, if the first chunk of the buffer was
7368 misaligned by just the wrong amount. The miscalculation would allow an
7369 attacker to overflow a piece of heap-allocated memory. To mount this
7370 attack, the attacker would need to either open a SOCKS connection to
7371 Tor's SocksPort (usually restricted to localhost), or target a Tor
7372 instance configured to make its connections through a SOCKS proxy
7373 (which Tor does not do by default).
7375 Good security practice requires that all heap-overflow bugs should be
7376 presumed to be exploitable until proven otherwise, so we are treating
7377 this as a potential code execution attack. Please upgrade immediately!
7378 This bug does not affect bufferevents-based builds of Tor. Special
7379 thanks to "Vektor" for reporting this issue to us!
7381 This release also contains a few minor bugfixes for issues discovered
7385 - Fix a heap overflow bug that could occur when trying to pull
7386 data into the first chunk of a buffer, when that chunk had
7387 already had some data drained from it. Fixes CVE-2011-2778;
7388 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
7391 - If we can't attach streams to a rendezvous circuit when we
7392 finish connecting to a hidden service, clear the rendezvous
7393 circuit's stream-isolation state and try to attach streams
7394 again. Previously, we cleared rendezvous circuits' isolation
7395 state either too early (if they were freshly built) or not at all
7396 (if they had been built earlier and were cannibalized). Bugfix on
7397 0.2.3.3-alpha; fixes bug 4655.
7398 - Fix compilation of the libnatpmp helper on non-Windows. Bugfix on
7399 0.2.3.9-alpha; fixes bug 4691. Reported by Anthony G. Basile.
7400 - Fix an assertion failure when a relay with accounting enabled
7401 starts up while dormant. Fixes bug 4702; bugfix on 0.2.3.9-alpha.
7404 - Update to the December 6 2011 Maxmind GeoLite Country database.
7407 Changes in version 0.2.2.35 - 2011-12-16
7408 Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
7409 buffers code. Absolutely everybody should upgrade.
7411 The bug relied on an incorrect calculation when making data continuous
7412 in one of our IO buffers, if the first chunk of the buffer was
7413 misaligned by just the wrong amount. The miscalculation would allow an
7414 attacker to overflow a piece of heap-allocated memory. To mount this
7415 attack, the attacker would need to either open a SOCKS connection to
7416 Tor's SocksPort (usually restricted to localhost), or target a Tor
7417 instance configured to make its connections through a SOCKS proxy
7418 (which Tor does not do by default).
7420 Good security practice requires that all heap-overflow bugs should be
7421 presumed to be exploitable until proven otherwise, so we are treating
7422 this as a potential code execution attack. Please upgrade immediately!
7423 This bug does not affect bufferevents-based builds of Tor. Special
7424 thanks to "Vektor" for reporting this issue to us!
7426 Tor 0.2.2.35 also fixes several bugs in previous versions, including
7427 crash bugs for unusual configurations, and a long-term bug that
7428 would prevent Tor from starting on Windows machines with draconian
7431 With this release, we remind everyone that 0.2.0.x has reached its
7432 formal end-of-life. Those Tor versions have many known flaws, and
7433 nobody should be using them. You should upgrade -- ideally to the
7434 0.2.2.x series. If you're using a Linux or BSD and its packages are
7435 obsolete, stop using those packages and upgrade anyway.
7437 The Tor 0.2.1.x series is also approaching its end-of-life: it will no
7438 longer receive support after some time in early 2012.
7441 - Fix a heap overflow bug that could occur when trying to pull
7442 data into the first chunk of a buffer, when that chunk had
7443 already had some data drained from it. Fixes CVE-2011-2778;
7444 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
7445 - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
7446 that it doesn't attempt to allocate a socketpair. This could cause
7447 some problems on Windows systems with overzealous firewalls. Fix for
7448 bug 4457; workaround for Libevent versions 2.0.1-alpha through
7450 - If we mark an OR connection for close based on a cell we process,
7451 don't process any further cells on it. We already avoid further
7452 reads on marked-for-close connections, but now we also discard the
7453 cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
7454 which was the first version where we might mark a connection for
7455 close based on processing a cell on it.
7456 - Correctly sanity-check that we don't underflow on a memory
7457 allocation (and then assert) for hidden service introduction
7458 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
7459 bugfix on 0.2.1.5-alpha.
7460 - Fix a memory leak when we check whether a hidden service
7461 descriptor has any usable introduction points left. Fixes bug
7462 4424. Bugfix on 0.2.2.25-alpha.
7463 - Don't crash when we're running as a relay and don't have a GeoIP
7464 file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
7465 we've had in the 0.2.3.x branch already.
7466 - When running as a client, do not print a misleading (and plain
7467 wrong) log message that we're collecting "directory request"
7468 statistics: clients don't collect statistics. Also don't create a
7469 useless (because empty) stats file in the stats/ directory. Fixes
7470 bug 4353; bugfix on 0.2.2.34.
7473 - Detect failure to initialize Libevent. This fix provides better
7474 detection for future instances of bug 4457.
7475 - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
7476 function. This was eating up hideously large amounts of time on some
7477 busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
7478 - Resolve an integer overflow bug in smartlist_ensure_capacity().
7479 Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
7481 - Don't warn about unused log_mutex in log.c when building with
7482 --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
7483 0.1.0.6-rc which introduced --disable-threads.
7484 - When configuring, starting, or stopping an NT service, stop
7485 immediately after the service configuration attempt has succeeded
7486 or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
7487 - When sending a NETINFO cell, include the original address
7488 received for the other side, not its canonical address. Found
7489 by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
7490 - Fix a typo in a hibernation-related log message. Fixes bug 4331;
7491 bugfix on 0.2.2.23-alpha; found by "tmpname0901".
7492 - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
7493 occurred when a client tried to fetch a descriptor for a bridge
7494 in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
7495 - Backport fixes for a pair of compilation warnings on Windows.
7496 Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
7497 - If we had ever tried to call tor_addr_to_str on an address of
7498 unknown type, we would have done a strdup on an uninitialized
7499 buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
7500 Reported by "troll_un".
7501 - Correctly detect and handle transient lookup failures from
7502 tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
7503 Reported by "troll_un".
7504 - Fix null-pointer access that could occur if TLS allocation failed.
7505 Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
7506 - Use tor_socket_t type for listener argument to accept(). Fixes bug
7507 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
7510 - Add two new config options for directory authorities:
7511 AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
7512 Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
7513 that is always sufficient to satisfy the bandwidth requirement for
7514 the Guard flag. Now it will be easier for researchers to simulate
7515 Tor networks with different values. Resolves ticket 4484.
7516 - When Tor ignores a hidden service specified in its configuration,
7517 include the hidden service's directory in the warning message.
7518 Previously, we would only tell the user that some hidden service
7519 was ignored. Bugfix on 0.0.6; fixes bug 4426.
7520 - Update to the December 6 2011 Maxmind GeoLite Country database.
7522 o Packaging changes:
7523 - Make it easier to automate expert package builds on Windows,
7524 by removing an absolute path from makensis.exe command.
7527 Changes in version 0.2.1.32 - 2011-12-16
7528 Tor 0.2.1.32 backports important security and privacy fixes for
7529 oldstable. This release is intended only for package maintainers and
7530 others who cannot use the 0.2.2 stable series. All others should be
7531 using Tor 0.2.2.x or newer.
7533 The Tor 0.2.1.x series will reach formal end-of-life some time in
7534 early 2012; we will stop releasing patches for it then.
7536 o Major bugfixes (also included in 0.2.2.x):
7537 - Correctly sanity-check that we don't underflow on a memory
7538 allocation (and then assert) for hidden service introduction
7539 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
7540 bugfix on 0.2.1.5-alpha.
7541 - Fix a heap overflow bug that could occur when trying to pull
7542 data into the first chunk of a buffer, when that chunk had
7543 already had some data drained from it. Fixes CVE-2011-2778;
7544 bugfix on 0.2.0.16-alpha. Reported by "Vektor".
7547 - Update to the December 6 2011 Maxmind GeoLite Country database.
7550 Changes in version 0.2.3.9-alpha - 2011-12-08
7551 Tor 0.2.3.9-alpha introduces initial IPv6 support for bridges, adds
7552 a "DisableNetwork" security feature that bundles can use to avoid
7553 touching the network until bridges are configured, moves forward on
7554 the pluggable transport design, fixes a flaw in the hidden service
7555 design that unnecessarily prevented clients with wrong clocks from
7556 reaching hidden services, and fixes a wide variety of other issues.
7559 - Clients can now connect to private bridges over IPv6. Bridges
7560 still need at least one IPv4 address in order to connect to
7561 other relays. Note that we don't yet handle the case where the
7562 user has two bridge lines for the same bridge (one IPv4, one
7563 IPv6). Implements parts of proposal 186.
7564 - New "DisableNetwork" config option to prevent Tor from launching any
7565 connections or accepting any connections except on a control port.
7566 Bundles and controllers can set this option before letting Tor talk
7567 to the rest of the network, for example to prevent any connections
7568 to a non-bridge address. Packages like Orbot can also use this
7569 option to instruct Tor to save power when the network is off.
7570 - Clients and bridges can now be configured to use a separate
7571 "transport" proxy. This approach makes the censorship arms race
7572 easier by allowing bridges to use protocol obfuscation plugins. It
7573 implements the "managed proxy" part of proposal 180 (ticket 3472).
7574 - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
7575 implementation. It makes AES_CTR about 7% faster than our old one
7576 (which was about 10% faster than the one OpenSSL used to provide).
7577 Resolves ticket 4526.
7578 - Add a "tor2web mode" for clients that want to connect to hidden
7579 services non-anonymously (and possibly more quickly). As a safety
7580 measure to try to keep users from turning this on without knowing
7581 what they are doing, tor2web mode must be explicitly enabled at
7582 compile time, and a copy of Tor compiled to run in tor2web mode
7583 cannot be used as a normal Tor client. Implements feature 2553.
7584 - Add experimental support for running on Windows with IOCP and no
7585 kernel-space socket buffers. This feature is controlled by a new
7586 "UserspaceIOCPBuffers" config option (off by default), which has
7587 no effect unless Tor has been built with support for bufferevents,
7588 is running on Windows, and has enabled IOCP. This may, in the long
7589 run, help solve or mitigate bug 98.
7590 - Use a more secure consensus parameter voting algorithm. Now at
7591 least three directory authorities or a majority of them must
7592 vote on a given parameter before it will be included in the
7593 consensus. Implements proposal 178.
7596 - Hidden services now ignore the timestamps on INTRODUCE2 cells.
7597 They used to check that the timestamp was within 30 minutes
7598 of their system clock, so they could cap the size of their
7599 replay-detection cache, but that approach unnecessarily refused
7600 service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
7601 the v3 intro-point protocol (the first one which sent a timestamp
7602 field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
7603 - Only use the EVP interface when AES acceleration is enabled,
7604 to avoid a 5-7% performance regression. Resolves issue 4525;
7605 bugfix on 0.2.3.8-alpha.
7607 o Privacy/anonymity features (bridge detection):
7608 - Make bridge SSL certificates a bit more stealthy by using random
7609 serial numbers, in the same fashion as OpenSSL when generating
7610 self-signed certificates. Implements ticket 4584.
7611 - Introduce a new config option "DynamicDHGroups", enabled by
7612 default, which provides each bridge with a unique prime DH modulus
7613 to be used during SSL handshakes. This option attempts to help
7614 against censors who might use the Apache DH modulus as a static
7615 identifier for bridges. Addresses ticket 4548.
7617 o Minor features (new/different config options):
7618 - New configuration option "DisableDebuggerAttachment" (on by default)
7619 to prevent basic debugging attachment attempts by other processes.
7620 Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
7621 - Allow MapAddress directives to specify matches against super-domains,
7622 as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
7623 Implements issue 933.
7624 - Slightly change behavior of "list" options (that is, config
7625 options that can appear more than once) when they appear both in
7626 torrc and on the command line. Previously, the command-line options
7627 would be appended to the ones from torrc. Now, the command-line
7628 options override the torrc options entirely. This new behavior
7629 allows the user to override list options (like exit policies and
7630 ports to listen on) from the command line, rather than simply
7631 appending to the list.
7632 - You can get the old (appending) command-line behavior for "list"
7633 options by prefixing the option name with a "+".
7634 - You can remove all the values for a "list" option from the command
7635 line without adding any new ones by prefixing the option name
7637 - Add experimental support for a "defaults" torrc file to be parsed
7638 before the regular torrc. Torrc options override the defaults file's
7639 options in the same way that the command line overrides the torrc.
7640 The SAVECONF controller command saves only those options which
7641 differ between the current configuration and the defaults file. HUP
7642 reloads both files. (Note: This is an experimental feature; its
7643 behavior will probably be refined in future 0.2.3.x-alpha versions
7644 to better meet packagers' needs.) Implements task 4552.
7647 - Try to make the introductory warning message that Tor prints on
7648 startup more useful for actually finding help and information.
7649 Resolves ticket 2474.
7650 - Running "make version" now displays the version of Tor that
7651 we're about to build. Idea from katmagic; resolves issue 4400.
7652 - Expire old or over-used hidden service introduction points.
7653 Required by fix for bug 3460.
7654 - Move the replay-detection cache for the RSA-encrypted parts of
7655 INTRODUCE2 cells to the introduction point data structures.
7656 Previously, we would use one replay-detection cache per hidden
7657 service. Required by fix for bug 3460.
7658 - Reduce the lifetime of elements of hidden services' Diffie-Hellman
7659 public key replay-detection cache from 60 minutes to 5 minutes. This
7660 replay-detection cache is now used only to detect multiple
7661 INTRODUCE2 cells specifying the same rendezvous point, so we can
7662 avoid launching multiple simultaneous attempts to connect to it.
7664 o Minor bugfixes (on Tor 0.2.2.x and earlier):
7665 - Resolve an integer overflow bug in smartlist_ensure_capacity().
7666 Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
7668 - Fix a minor formatting issue in one of tor-gencert's error messages.
7670 - Prevent a false positive from the check-spaces script, by disabling
7671 the "whitespace between function name and (" check for functions
7673 - Fix a log message suggesting that people contact a non-existent
7674 email address. Fixes bug 3448.
7675 - Fix null-pointer access that could occur if TLS allocation failed.
7676 Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
7677 - Report a real bootstrap problem to the controller on router
7678 identity mismatch. Previously we just said "foo", which probably
7679 made a lot of sense at the time. Fixes bug 4169; bugfix on
7681 - If we had ever tried to call tor_addr_to_str() on an address of
7682 unknown type, we would have done a strdup() on an uninitialized
7683 buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
7684 Reported by "troll_un".
7685 - Correctly detect and handle transient lookup failures from
7686 tor_addr_lookup(). Fixes bug 4530; bugfix on 0.2.1.5-alpha.
7687 Reported by "troll_un".
7688 - Use tor_socket_t type for listener argument to accept(). Fixes bug
7689 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
7690 - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
7691 bug 4532; found by "troll_un".
7693 o Minor bugfixes (on Tor 0.2.3.x):
7694 - Fix a compile warning in tor_inet_pton(). Bugfix on 0.2.3.8-alpha;
7696 - Don't send two ESTABLISH_RENDEZVOUS cells when opening a new
7697 circuit for use as a hidden service client's rendezvous point.
7698 Fixes bugs 4641 and 4171; bugfix on 0.2.3.3-alpha. Diagnosed
7699 with help from wanoskarnet.
7700 - Restore behavior of overriding SocksPort, ORPort, and similar
7701 options from the command line. Bugfix on 0.2.3.3-alpha.
7704 - Properly handle the case where the build-tree is not the same
7705 as the source tree when generating src/common/common_sha1.i,
7706 src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
7707 bugfix on 0.2.0.1-alpha.
7709 o Code simplifications, cleanups, and refactorings:
7710 - Remove the pure attribute from all functions that used it
7711 previously. In many cases we assigned it incorrectly, because the
7712 functions might assert or call impure functions, and we don't have
7713 evidence that keeping the pure attribute is worthwhile. Implements
7714 changes suggested in ticket 4421.
7715 - Remove some dead code spotted by coverity. Fixes cid 432.
7716 Bugfix on 0.2.3.1-alpha, closes bug 4637.
7719 Changes in version 0.2.3.8-alpha - 2011-11-22
7720 Tor 0.2.3.8-alpha fixes some crash and assert bugs, including a
7721 socketpair-related bug that has been bothering Windows users. It adds
7722 support to serve microdescriptors to controllers, so Vidalia's network
7723 map can resume listing relays (once Vidalia implements its side),
7724 and adds better support for hardware AES acceleration. Finally, it
7725 starts the process of adjusting the bandwidth cutoff for getting the
7726 "Fast" flag from 20KB to (currently) 32KB -- preliminary results show
7727 that tiny relays harm performance more than they help network capacity.
7730 - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
7731 that it doesn't attempt to allocate a socketpair. This could cause
7732 some problems on Windows systems with overzealous firewalls. Fix for
7733 bug 4457; workaround for Libevent versions 2.0.1-alpha through
7735 - Correctly sanity-check that we don't underflow on a memory
7736 allocation (and then assert) for hidden service introduction
7737 point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
7738 bugfix on 0.2.1.5-alpha.
7739 - Remove the artificially low cutoff of 20KB to guarantee the Fast
7740 flag. In the past few years the average relay speed has picked
7741 up, and while the "top 7/8 of the network get the Fast flag" and
7742 "all relays with 20KB or more of capacity get the Fast flag" rules
7743 used to have the same result, now the top 7/8 of the network has
7744 a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
7745 - Fix a rare assertion failure when checking whether a v0 hidden
7746 service descriptor has any usable introduction points left, and
7747 we don't have enough information to build a circuit to the first
7748 intro point named in the descriptor. The HS client code in
7749 0.2.3.x no longer uses v0 HS descriptors, but this assertion can
7750 trigger on (and crash) v0 HS authorities. Fixes bug 4411.
7751 Bugfix on 0.2.3.1-alpha; diagnosed by frosty_un.
7752 - Make bridge authorities not crash when they are asked for their own
7753 descriptor. Bugfix on 0.2.3.7-alpha, reported by Lucky Green.
7754 - When running as a client, do not print a misleading (and plain
7755 wrong) log message that we're collecting "directory request"
7756 statistics: clients don't collect statistics. Also don't create a
7757 useless (because empty) stats file in the stats/ directory. Fixes
7758 bug 4353; bugfix on 0.2.2.34 and 0.2.3.7-alpha.
7761 - Allow Tor controllers like Vidalia to obtain the microdescriptor
7762 for a relay by identity digest or nickname. Previously,
7763 microdescriptors were only available by their own digests, so a
7764 controller would have to ask for and parse the whole microdescriptor
7765 consensus in order to look up a single relay's microdesc. Fixes
7766 bug 3832; bugfix on 0.2.3.1-alpha.
7767 - Use OpenSSL's EVP interface for AES encryption, so that all AES
7768 operations can use hardware acceleration (if present). Resolves
7771 o Minor bugfixes (on 0.2.2.x and earlier):
7772 - Detect failure to initialize Libevent. This fix provides better
7773 detection for future instances of bug 4457.
7774 - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
7775 function. This was eating up hideously large amounts of time on some
7776 busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
7777 - Don't warn about unused log_mutex in log.c when building with
7778 --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
7779 0.1.0.6-rc which introduced --disable-threads.
7780 - Allow manual 'authenticate' commands to the controller interface
7781 from netcat (nc) as well as telnet. We were rejecting them because
7782 they didn't come with the expected whitespace at the end of the
7783 command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
7784 - Fix some (not actually triggerable) buffer size checks in usage of
7785 tor_inet_ntop. Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
7787 - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
7788 bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
7789 - When configuring, starting, or stopping an NT service, stop
7790 immediately after the service configuration attempt has succeeded
7791 or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
7792 - When sending a NETINFO cell, include the original address
7793 received for the other side, not its canonical address. Found
7794 by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
7795 - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
7796 can pick them up when the tests aren't disabled. Bugfix on
7797 0.2.2.4-alpha which introduced tinytest.
7798 - Fix a memory leak when we check whether a hidden service
7799 descriptor has any usable introduction points left. Fixes bug
7800 4424. Bugfix on 0.2.2.25-alpha.
7801 - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
7802 occurred when a client tried to fetch a descriptor for a bridge
7803 in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
7805 o Minor bugfixes (on 0.2.3.x):
7806 - Make util unit tests build correctly with MSVC. Bugfix on
7807 0.2.3.3-alpha. Patch by Gisle Vanem.
7808 - Successfully detect AUTH_CHALLENGE cells with no recognized
7809 authentication type listed. Fixes bug 4367; bugfix on 0.2.3.6-alpha.
7811 - If a relay receives an AUTH_CHALLENGE cell it can't answer,
7812 it should still send a NETINFO cell to allow the connection to
7813 become open. Fixes bug 4368; fix on 0.2.3.6-alpha; bug found by
7815 - Log less loudly when we get an invalid authentication certificate
7816 from a source other than a directory authority: it's not unusual
7817 to see invalid certs because of clock skew. Fixes bug 4370; bugfix
7819 - Tolerate servers with more clock skew in their authentication
7820 certificates than previously. Fixes bug 4371; bugfix on
7822 - Fix a couple of compile warnings on Windows. Fixes bug 4469; bugfix
7823 on 0.2.3.4-alpha and 0.2.3.6-alpha.
7826 - Add two new config options for directory authorities:
7827 AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
7828 Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
7829 that is always sufficient to satisfy the bandwidth requirement for
7830 the Guard flag. Now it will be easier for researchers to simulate
7831 Tor networks with different values. Resolves ticket 4484.
7832 - When Tor ignores a hidden service specified in its configuration,
7833 include the hidden service's directory in the warning message.
7834 Previously, we would only tell the user that some hidden service
7835 was ignored. Bugfix on 0.0.6; fixes bug 4426.
7836 - When we fail to initialize Libevent, retry with IOCP disabled so we
7837 don't need to turn on multi-threading support in Libevent, which in
7838 turn requires a working socketpair(). This is a workaround for bug
7839 4457, which affects Libevent versions from 2.0.1-alpha through
7841 - Detect when we try to build on a platform that doesn't define
7842 AF_UNSPEC to 0. We don't work there, so refuse to compile.
7843 - Update to the November 1 2011 Maxmind GeoLite Country database.
7845 o Packaging changes:
7846 - Make it easier to automate expert package builds on Windows,
7847 by removing an absolute path from makensis.exe command.
7849 o Code simplifications and refactoring:
7850 - Remove some redundant #include directives throughout the code.
7851 Patch from Andrea Gelmini.
7852 - Unconditionally use OpenSSL's AES implementation instead of our
7853 old built-in one. OpenSSL's AES has been better for a while, and
7854 relatively few servers should still be on any version of OpenSSL
7855 that doesn't have good optimized assembly AES.
7856 - Use the name "CERTS" consistently to refer to the new cell type;
7857 we were calling it CERT in some places and CERTS in others.
7860 - Numerous new unit tests for functions in util.c and address.c by
7862 - The long-disabled benchmark tests are now split into their own
7863 ./src/test/bench binary.
7864 - The benchmark tests can now use more accurate timers than
7865 gettimeofday() when such timers are available.
7868 Changes in version 0.2.3.7-alpha - 2011-10-30
7869 Tor 0.2.3.7-alpha fixes a crash bug in 0.2.3.6-alpha introduced by
7870 the new v3 handshake. It also resolves yet another bridge address
7874 - If we mark an OR connection for close based on a cell we process,
7875 don't process any further cells on it. We already avoid further
7876 reads on marked-for-close connections, but now we also discard the
7877 cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
7878 which was the first version where we might mark a connection for
7879 close based on processing a cell on it.
7880 - Fix a double-free bug that would occur when we received an invalid
7881 certificate in a CERT cell in the new v3 handshake. Fixes bug 4343;
7882 bugfix on 0.2.3.6-alpha.
7883 - Bridges no longer include their address in NETINFO cells on outgoing
7884 OR connections, to allow them to blend in better with clients.
7885 Removes another avenue for enumerating bridges. Reported by
7886 "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
7887 cells were introduced.
7890 - Fixed a typo in a hibernation-related log message. Fixes bug 4331;
7891 bugfix on 0.2.2.23-alpha; found by "tmpname0901".
7894 Changes in version 0.2.3.6-alpha - 2011-10-26
7895 Tor 0.2.3.6-alpha includes the fix from 0.2.2.34 for a critical
7896 anonymity vulnerability where an attacker can deanonymize Tor
7897 users. Everybody should upgrade.
7899 This release also features support for a new v3 connection handshake
7900 protocol, and fixes to make hidden service connections more robust.
7903 - Implement a new handshake protocol (v3) for authenticating Tors to
7904 each other over TLS. It should be more resistant to fingerprinting
7905 than previous protocols, and should require less TLS hacking for
7906 future Tor implementations. Implements proposal 176.
7907 - Allow variable-length padding cells to disguise the length of
7908 Tor's TLS records. Implements part of proposal 184.
7910 o Privacy/anonymity fixes (clients):
7911 - Clients and bridges no longer send TLS certificate chains on
7912 outgoing OR connections. Previously, each client or bridge would
7913 use the same cert chain for all outgoing OR connections until
7914 its IP address changes, which allowed any relay that the client
7915 or bridge contacted to determine which entry guards it is using.
7916 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
7917 - If a relay receives a CREATE_FAST cell on a TLS connection, it
7918 no longer considers that connection as suitable for satisfying a
7919 circuit EXTEND request. Now relays can protect clients from the
7920 CVE-2011-2768 issue even if the clients haven't upgraded yet.
7921 - Directory authorities no longer assign the Guard flag to relays
7922 that haven't upgraded to the above "refuse EXTEND requests
7923 to client connections" fix. Now directory authorities can
7924 protect clients from the CVE-2011-2768 issue even if neither
7925 the clients nor the relays have upgraded yet. There's a new
7926 "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
7927 to let us transition smoothly, else tomorrow there would be no
7930 o Major bugfixes (hidden services):
7931 - Improve hidden service robustness: when an attempt to connect to
7932 a hidden service ends, be willing to refetch its hidden service
7933 descriptors from each of the HSDir relays responsible for them
7934 immediately. Previously, we would not consider refetching the
7935 service's descriptors from each HSDir for 15 minutes after the last
7936 fetch, which was inconvenient if the hidden service was not running
7937 during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
7938 - When one of a hidden service's introduction points appears to be
7939 unreachable, stop trying it. Previously, we would keep trying
7940 to build circuits to the introduction point until we lost the
7941 descriptor, usually because the user gave up and restarted Tor.
7942 Partly fixes bug 3825.
7943 - Don't launch a useless circuit after failing to use one of a
7944 hidden service's introduction points. Previously, we would
7945 launch a new introduction circuit, but not set the hidden service
7946 which that circuit was intended to connect to, so it would never
7947 actually be used. A different piece of code would then create a
7948 new introduction circuit correctly. Bug reported by katmagic and
7949 found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
7951 o Major bugfixes (other):
7952 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
7953 that they initiated. Relays could distinguish incoming bridge
7954 connections from client connections, creating another avenue for
7955 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
7956 Found by "frosty_un".
7957 - Don't update the AccountingSoftLimitHitAt state file entry whenever
7958 tor gets started. This prevents a wrong average bandwidth
7959 estimate, which would cause relays to always start a new accounting
7960 interval at the earliest possible moment. Fixes bug 2003; bugfix
7961 on 0.2.2.7-alpha. Reported by BryonEldridge, who also helped
7962 immensely in tracking this bug down.
7963 - Fix a crash bug when changing node restrictions while a DNS lookup
7964 is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
7967 o Minor bugfixes (on 0.2.2.x and earlier):
7968 - When a hidden service turns an extra service-side introduction
7969 circuit into a general-purpose circuit, free the rend_data and
7970 intro_key fields first, so we won't leak memory if the circuit
7971 is cannibalized for use as another service-side introduction
7972 circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
7973 - Rephrase the log message emitted if the TestSocks check is
7974 successful. Patch from Fabian Keil; fixes bug 4094.
7975 - Bridges now skip DNS self-tests, to act a little more stealthily.
7976 Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
7977 bridges. Patch by "warms0x".
7978 - Remove a confusing dollar sign from the example fingerprint in the
7979 man page, and also make the example fingerprint a valid one. Fixes
7980 bug 4309; bugfix on 0.2.1.3-alpha.
7981 - Fix internal bug-checking logic that was supposed to catch
7982 failures in digest generation so that it will fail more robustly
7983 if we ask for a nonexistent algorithm. Found by Coverity Scan.
7984 Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
7985 - Report any failure in init_keys() calls launched because our
7986 IP address has changed. Spotted by Coverity Scan. Bugfix on
7987 0.1.1.4-alpha; fixes CID 484.
7989 o Minor bugfixes (on 0.2.3.x):
7990 - Fix a bug in configure.in that kept it from building a configure
7991 script with autoconf versions earlier than 2.61. Fixes bug 2430;
7992 bugfix on 0.2.3.1-alpha.
7993 - Don't warn users that they are exposing a client port to the
7994 Internet if they have specified an RFC1918 address. Previously,
7995 we would warn if the user had specified any non-loopback
7996 address. Bugfix on 0.2.3.3-alpha. Fixes bug 4018; reported by Tas.
7997 - Fix memory leaks in the failing cases of the new SocksPort and
7998 ControlPort code. Found by Coverity Scan. Bugfix on 0.2.3.3-alpha;
7999 fixes coverity CIDs 485, 486, and 487.
8002 - When a hidden service's introduction point times out, consider
8003 trying it again during the next attempt to connect to the
8004 HS. Previously, we would not try it again unless a newly fetched
8005 descriptor contained it. Required by fixes for bugs 1297 and 3825.
8006 - The next version of Windows will be called Windows 8, and it has
8007 a major version of 6, minor version of 2. Correctly identify that
8008 version instead of calling it "Very recent version". Resolves
8009 ticket 4153; reported by funkstar.
8010 - The Bridge Authority now writes statistics on how many bridge
8011 descriptors it gave out in total, and how many unique descriptors
8012 it gave out. It also lists how often the most and least commonly
8013 fetched descriptors were given out, as well as the median and
8014 25th/75th percentile. Implements tickets 4200 and 4294.
8015 - Update to the October 4 2011 Maxmind GeoLite Country database.
8017 o Code simplifications and refactoring:
8018 - Remove some old code to remember statistics about which descriptors
8019 we've served as a directory mirror. The feature wasn't used and
8020 is outdated now that microdescriptors are around.
8021 - Rename Tor functions that turn strings into addresses, so that
8022 "parse" indicates that no hostname resolution occurs, and
8023 "lookup" indicates that hostname resolution may occur. This
8024 should help prevent mistakes in the future. Fixes bug 3512.
8027 Changes in version 0.2.2.34 - 2011-10-26
8028 Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
8029 can deanonymize Tor users. Everybody should upgrade.
8031 The attack relies on four components: 1) Clients reuse their TLS cert
8032 when talking to different relays, so relays can recognize a user by
8033 the identity key in her cert. 2) An attacker who knows the client's
8034 identity key can probe each guard relay to see if that identity key
8035 is connected to that guard relay right now. 3) A variety of active
8036 attacks in the literature (starting from "Low-Cost Traffic Analysis
8037 of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
8038 discover the guard relays that a Tor user visiting the website is using.
8039 4) Clients typically pick three guards at random, so the set of guards
8040 for a given user could well be a unique fingerprint for her. This
8041 release fixes components #1 and #2, which is enough to block the attack;
8042 the other two remain as open research problems. Special thanks to
8043 "frosty_un" for reporting the issue to us!
8045 Clients should upgrade so they are no longer recognizable by the TLS
8046 certs they present. Relays should upgrade so they no longer allow a
8047 remote attacker to probe them to test whether unpatched clients are
8048 currently connected to them.
8050 This release also fixes several vulnerabilities that allow an attacker
8051 to enumerate bridge relays. Some bridge enumeration attacks still
8052 remain; see for example proposal 188.
8054 o Privacy/anonymity fixes (clients):
8055 - Clients and bridges no longer send TLS certificate chains on
8056 outgoing OR connections. Previously, each client or bridge would
8057 use the same cert chain for all outgoing OR connections until
8058 its IP address changes, which allowed any relay that the client
8059 or bridge contacted to determine which entry guards it is using.
8060 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
8061 - If a relay receives a CREATE_FAST cell on a TLS connection, it
8062 no longer considers that connection as suitable for satisfying a
8063 circuit EXTEND request. Now relays can protect clients from the
8064 CVE-2011-2768 issue even if the clients haven't upgraded yet.
8065 - Directory authorities no longer assign the Guard flag to relays
8066 that haven't upgraded to the above "refuse EXTEND requests
8067 to client connections" fix. Now directory authorities can
8068 protect clients from the CVE-2011-2768 issue even if neither
8069 the clients nor the relays have upgraded yet. There's a new
8070 "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
8071 to let us transition smoothly, else tomorrow there would be no
8074 o Privacy/anonymity fixes (bridge enumeration):
8075 - Bridge relays now do their directory fetches inside Tor TLS
8076 connections, like all the other clients do, rather than connecting
8077 directly to the DirPort like public relays do. Removes another
8078 avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
8079 - Bridges relays now build circuits for themselves in a more similar
8080 way to how clients build them. Removes another avenue for
8081 enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
8082 when bridges were introduced.
8083 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
8084 that they initiated. Relays could distinguish incoming bridge
8085 connections from client connections, creating another avenue for
8086 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
8087 Found by "frosty_un".
8090 - Fix a crash bug when changing node restrictions while a DNS lookup
8091 is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
8093 - Don't launch a useless circuit after failing to use one of a
8094 hidden service's introduction points. Previously, we would
8095 launch a new introduction circuit, but not set the hidden service
8096 which that circuit was intended to connect to, so it would never
8097 actually be used. A different piece of code would then create a
8098 new introduction circuit correctly. Bug reported by katmagic and
8099 found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
8102 - Change an integer overflow check in the OpenBSD_Malloc code so
8103 that GCC is less likely to eliminate it as impossible. Patch
8104 from Mansour Moufid. Fixes bug 4059.
8105 - When a hidden service turns an extra service-side introduction
8106 circuit into a general-purpose circuit, free the rend_data and
8107 intro_key fields first, so we won't leak memory if the circuit
8108 is cannibalized for use as another service-side introduction
8109 circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
8110 - Bridges now skip DNS self-tests, to act a little more stealthily.
8111 Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
8112 bridges. Patch by "warms0x".
8113 - Fix internal bug-checking logic that was supposed to catch
8114 failures in digest generation so that it will fail more robustly
8115 if we ask for a nonexistent algorithm. Found by Coverity Scan.
8116 Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
8117 - Report any failure in init_keys() calls launched because our
8118 IP address has changed. Spotted by Coverity Scan. Bugfix on
8119 0.1.1.4-alpha; fixes CID 484.
8121 o Minor bugfixes (log messages and documentation):
8122 - Remove a confusing dollar sign from the example fingerprint in the
8123 man page, and also make the example fingerprint a valid one. Fixes
8124 bug 4309; bugfix on 0.2.1.3-alpha.
8125 - The next version of Windows will be called Windows 8, and it has
8126 a major version of 6, minor version of 2. Correctly identify that
8127 version instead of calling it "Very recent version". Resolves
8128 ticket 4153; reported by funkstar.
8129 - Downgrade log messages about circuit timeout calibration from
8130 "notice" to "info": they don't require or suggest any human
8131 intervention. Patch from Tom Lowenthal. Fixes bug 4063;
8132 bugfix on 0.2.2.14-alpha.
8135 - Turn on directory request statistics by default and include them in
8136 extra-info descriptors. Don't break if we have no GeoIP database.
8137 Backported from 0.2.3.1-alpha; implements ticket 3951.
8138 - Update to the October 4 2011 Maxmind GeoLite Country database.
8141 Changes in version 0.2.1.31 - 2011-10-26
8142 Tor 0.2.1.31 backports important security and privacy fixes for
8143 oldstable. This release is intended only for package maintainers and
8144 others who cannot use the 0.2.2 stable series. All others should be
8145 using Tor 0.2.2.x or newer.
8147 o Security fixes (also included in 0.2.2.x):
8148 - Replace all potentially sensitive memory comparison operations
8149 with versions whose runtime does not depend on the data being
8150 compared. This will help resist a class of attacks where an
8151 adversary can use variations in timing information to learn
8152 sensitive data. Fix for one case of bug 3122. (Safe memcmp
8153 implementation by Robert Ransom based partially on code by DJB.)
8154 - Fix an assert in parsing router descriptors containing IPv6
8155 addresses. This one took down the directory authorities when
8156 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
8158 o Privacy/anonymity fixes (also included in 0.2.2.x):
8159 - Clients and bridges no longer send TLS certificate chains on
8160 outgoing OR connections. Previously, each client or bridge would
8161 use the same cert chain for all outgoing OR connections until
8162 its IP address changes, which allowed any relay that the client
8163 or bridge contacted to determine which entry guards it is using.
8164 Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
8165 - If a relay receives a CREATE_FAST cell on a TLS connection, it
8166 no longer considers that connection as suitable for satisfying a
8167 circuit EXTEND request. Now relays can protect clients from the
8168 CVE-2011-2768 issue even if the clients haven't upgraded yet.
8169 - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
8170 that they initiated. Relays could distinguish incoming bridge
8171 connections from client connections, creating another avenue for
8172 enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
8173 Found by "frosty_un".
8174 - When receiving a hidden service descriptor, check that it is for
8175 the hidden service we wanted. Previously, Tor would store any
8176 hidden service descriptors that a directory gave it, whether it
8177 wanted them or not. This wouldn't have let an attacker impersonate
8178 a hidden service, but it did let directories pre-seed a client
8179 with descriptors that it didn't want. Bugfix on 0.0.6.
8180 - Avoid linkability based on cached hidden service descriptors: forget
8181 all hidden service descriptors cached as a client when processing a
8182 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
8183 - Make the bridge directory authority refuse to answer directory
8184 requests for "all" descriptors. It used to include bridge
8185 descriptors in its answer, which was a major information leak.
8186 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
8187 - Don't attach new streams to old rendezvous circuits after SIGNAL
8188 NEWNYM. Previously, we would keep using an existing rendezvous
8189 circuit if it remained open (i.e. if it were kept open by a
8190 long-lived stream, or if a new stream were attached to it before
8191 Tor could notice that it was old and no longer in use). Bugfix on
8192 0.1.1.15-rc; fixes bug 3375.
8194 o Minor bugfixes (also included in 0.2.2.x):
8195 - When we restart our relay, we might get a successful connection
8196 from the outside before we've started our reachability tests,
8197 triggering a warning: "ORPort found reachable, but I have no
8198 routerinfo yet. Failing to inform controller of success." This
8199 bug was harmless unless Tor is running under a controller
8200 like Vidalia, in which case the controller would never get a
8201 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
8203 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
8204 enabled. Fixes bug 1526.
8205 - Remove undocumented option "-F" from tor-resolve: it hasn't done
8206 anything since 0.2.1.16-rc.
8207 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
8208 None of the cases where we did this before were wrong, but by making
8209 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
8210 - Fix a rare crash bug that could occur when a client was configured
8211 with a large number of bridges. Fixes bug 2629; bugfix on
8212 0.2.1.2-alpha. Bugfix by trac user "shitlei".
8213 - Correct the warning displayed when a rendezvous descriptor exceeds
8214 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
8216 - Fix an uncommon assertion failure when running with DNSPort under
8217 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
8218 - When warning about missing zlib development packages during compile,
8219 give the correct package names. Bugfix on 0.2.0.1-alpha.
8220 - Require that introduction point keys and onion keys have public
8221 exponent 65537. Bugfix on 0.2.0.10-alpha.
8222 - Do not crash when our configuration file becomes unreadable, for
8223 example due to a permissions change, between when we start up
8224 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
8226 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
8228 - Always NUL-terminate the sun_path field of a sockaddr_un before
8229 passing it to the kernel. (Not a security issue: kernels are
8230 smart enough to reject bad sockaddr_uns.) Found by Coverity;
8231 CID #428. Bugfix on Tor 0.2.0.3-alpha.
8232 - Don't stack-allocate the list of supplementary GIDs when we're
8233 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
8234 could take up to 256K, which is way too much stack. Found by
8235 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
8237 o Minor bugfixes (only in 0.2.1.x):
8238 - Resume using micro-version numbers in 0.2.1.x: our Debian packages
8239 rely on them. Bugfix on 0.2.1.30.
8240 - Use git revisions instead of svn revisions when generating our
8241 micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
8243 o Minor features (also included in 0.2.2.x):
8244 - Adjust the expiration time on our SSL session certificates to
8245 better match SSL certs seen in the wild. Resolves ticket 4014.
8246 - Allow nameservers with IPv6 address. Resolves bug 2574.
8247 - Update to the October 4 2011 Maxmind GeoLite Country database.
8250 Changes in version 0.2.3.5-alpha - 2011-09-28
8251 Tor 0.2.3.5-alpha fixes two bugs that make it possible to enumerate
8252 bridge relays; fixes an assertion error that many users started hitting
8253 today; and adds the ability to refill token buckets more often than
8254 once per second, allowing significant performance improvements.
8257 - Bridge relays now do their directory fetches inside Tor TLS
8258 connections, like all the other clients do, rather than connecting
8259 directly to the DirPort like public relays do. Removes another
8260 avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
8261 - Bridges relays now build circuits for themselves in a more similar
8262 way to how clients build them. Removes another avenue for
8263 enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
8264 when bridges were introduced.
8267 - Fix an "Assertion md->held_by_node == 1 failed" error that could
8268 occur when the same microdescriptor was referenced by two node_t
8269 objects at once. Fix for bug 4118; bugfix on Tor 0.2.3.1-alpha.
8271 o Major features (networking):
8272 - Add a new TokenBucketRefillInterval option to refill token buckets
8273 more frequently than once per second. This should improve network
8274 performance, alleviate queueing problems, and make traffic less
8275 bursty. Implements proposal 183; closes ticket 3630. Design by
8276 Florian Tschorsch and Björn Scheuermann; implementation by
8280 - Change an integer overflow check in the OpenBSD_Malloc code so
8281 that GCC is less likely to eliminate it as impossible. Patch
8282 from Mansour Moufid. Fixes bug 4059.
8284 o Minor bugfixes (usability):
8285 - Downgrade log messages about circuit timeout calibration from
8286 "notice" to "info": they don't require or suggest any human
8287 intervention. Patch from Tom Lowenthal. Fixes bug 4063;
8288 bugfix on 0.2.2.14-alpha.
8290 o Minor features (diagnostics):
8291 - When the system call to create a listener socket fails, log the
8292 error message explaining why. This may help diagnose bug 4027.
8295 Changes in version 0.2.3.4-alpha - 2011-09-13
8296 Tor 0.2.3.4-alpha includes the fixes from 0.2.2.33, including a slight
8297 tweak to Tor's TLS handshake that makes relays and bridges that run
8298 this new version reachable from Iran again. It also fixes a few new
8299 bugs in 0.2.3.x, and teaches relays to recognize when they're not
8300 listed in the network consensus and republish.
8302 o Major bugfixes (also part of 0.2.2.33):
8303 - Avoid an assertion failure when reloading a configuration with
8304 TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
8305 3923; bugfix on 0.2.2.25-alpha.
8307 o Minor features (security, also part of 0.2.2.33):
8308 - Check for replays of the public-key encrypted portion of an
8309 INTRODUCE1 cell, in addition to the current check for replays of
8310 the g^x value. This prevents a possible class of active attacks
8311 by an attacker who controls both an introduction point and a
8312 rendezvous point, and who uses the malleability of AES-CTR to
8313 alter the encrypted g^x portion of the INTRODUCE1 cell. We think
8314 that these attacks are infeasible (requiring the attacker to send
8315 on the order of zettabytes of altered cells in a short interval),
8316 but we'd rather block them off in case there are any classes of
8317 this attack that we missed. Reported by Willem Pinckaers.
8319 o Minor features (also part of 0.2.2.33):
8320 - Adjust the expiration time on our SSL session certificates to
8321 better match SSL certs seen in the wild. Resolves ticket 4014.
8322 - Change the default required uptime for a relay to be accepted as
8323 a HSDir (hidden service directory) from 24 hours to 25 hours.
8324 Improves on 0.2.0.10-alpha; resolves ticket 2649.
8325 - Add a VoteOnHidServDirectoriesV2 config option to allow directory
8326 authorities to abstain from voting on assignment of the HSDir
8327 consensus flag. Related to bug 2649.
8328 - Update to the September 6 2011 Maxmind GeoLite Country database.
8330 o Minor bugfixes (also part of 0.2.2.33):
8331 - Demote the 'replay detected' log message emitted when a hidden
8332 service receives the same Diffie-Hellman public key in two different
8333 INTRODUCE2 cells to info level. A normal Tor client can cause that
8334 log message during its normal operation. Bugfix on 0.2.1.6-alpha;
8335 fixes part of bug 2442.
8336 - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
8337 level. There is nothing that a hidden service's operator can do
8338 to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
8340 - Clarify a log message specifying the characters permitted in
8341 HiddenServiceAuthorizeClient client names. Previously, the log
8342 message said that "[A-Za-z0-9+-_]" were permitted; that could have
8343 given the impression that every ASCII character between "+" and "_"
8344 was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
8346 o Build fixes (also part of 0.2.2.33):
8347 - Clean up some code issues that prevented Tor from building on older
8348 BSDs. Fixes bug 3894; reported by "grarpamp".
8349 - Search for a platform-specific version of "ar" when cross-compiling.
8350 Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
8353 - Fix a bug where the SocksPort option (for example) would get
8354 ignored and replaced by the default if a SocksListenAddress
8355 option was set. Bugfix on 0.2.3.3-alpha; fixes bug 3936. Fix by
8359 - Relays now try regenerating and uploading their descriptor more
8360 frequently if they are not listed in the consensus, or if the
8361 version of their descriptor listed in the consensus is too
8362 old. This fix should prevent situations where a server declines
8363 to re-publish itself because it has done so too recently, even
8364 though the authorities decided not to list its recent-enough
8365 descriptor. Fix for bug 3327.
8368 - Relays now include a reason for regenerating their descriptors
8369 in an HTTP header when uploading to the authorities. This will
8370 make it easier to debug descriptor-upload issues in the future.
8371 - When starting as root and then changing our UID via the User
8372 control option, and we have a ControlSocket configured, make sure
8373 that the ControlSocket is owned by the same account that Tor will
8374 run under. Implements ticket 3421; fix by Jérémy Bobbio.
8377 - Abort if tor_vasprintf fails in connection_printf_to_buf (a
8378 utility function used in the control-port code). This shouldn't
8379 ever happen unless Tor is completely out of memory, but if it did
8380 happen and Tor somehow recovered from it, Tor could have sent a log
8381 message to a control port in the middle of a reply to a controller
8382 command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
8383 - Make 'FetchUselessDescriptors' cause all descriptor types and
8384 all consensus types (including microdescriptors) to get fetched.
8385 Fixes bug 3851; bugfix on 0.2.3.1-alpha.
8388 - Make a new "entry connection" struct as an internal subtype of "edge
8389 connection", to simplify the code and make exit connections smaller.
8392 Changes in version 0.2.2.33 - 2011-09-13
8393 Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
8394 TLS handshake that makes relays and bridges that run this new version
8395 reachable from Iran again.
8398 - Avoid an assertion failure when reloading a configuration with
8399 TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
8400 3923; bugfix on 0.2.2.25-alpha.
8402 o Minor features (security):
8403 - Check for replays of the public-key encrypted portion of an
8404 INTRODUCE1 cell, in addition to the current check for replays of
8405 the g^x value. This prevents a possible class of active attacks
8406 by an attacker who controls both an introduction point and a
8407 rendezvous point, and who uses the malleability of AES-CTR to
8408 alter the encrypted g^x portion of the INTRODUCE1 cell. We think
8409 that these attacks are infeasible (requiring the attacker to send
8410 on the order of zettabytes of altered cells in a short interval),
8411 but we'd rather block them off in case there are any classes of
8412 this attack that we missed. Reported by Willem Pinckaers.
8415 - Adjust the expiration time on our SSL session certificates to
8416 better match SSL certs seen in the wild. Resolves ticket 4014.
8417 - Change the default required uptime for a relay to be accepted as
8418 a HSDir (hidden service directory) from 24 hours to 25 hours.
8419 Improves on 0.2.0.10-alpha; resolves ticket 2649.
8420 - Add a VoteOnHidServDirectoriesV2 config option to allow directory
8421 authorities to abstain from voting on assignment of the HSDir
8422 consensus flag. Related to bug 2649.
8423 - Update to the September 6 2011 Maxmind GeoLite Country database.
8425 o Minor bugfixes (documentation and log messages):
8426 - Correct the man page to explain that HashedControlPassword and
8427 CookieAuthentication can both be set, in which case either method
8428 is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
8429 when we decided to allow these config options to both be set. Issue
8431 - Demote the 'replay detected' log message emitted when a hidden
8432 service receives the same Diffie-Hellman public key in two different
8433 INTRODUCE2 cells to info level. A normal Tor client can cause that
8434 log message during its normal operation. Bugfix on 0.2.1.6-alpha;
8435 fixes part of bug 2442.
8436 - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
8437 level. There is nothing that a hidden service's operator can do
8438 to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
8440 - Clarify a log message specifying the characters permitted in
8441 HiddenServiceAuthorizeClient client names. Previously, the log
8442 message said that "[A-Za-z0-9+-_]" were permitted; that could have
8443 given the impression that every ASCII character between "+" and "_"
8444 was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
8447 - Provide a substitute implementation of lround() for MSVC, which
8448 apparently lacks it. Patch from Gisle Vanem.
8449 - Clean up some code issues that prevented Tor from building on older
8450 BSDs. Fixes bug 3894; reported by "grarpamp".
8451 - Search for a platform-specific version of "ar" when cross-compiling.
8452 Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
8455 Changes in version 0.2.3.3-alpha - 2011-09-01
8456 Tor 0.2.3.3-alpha adds a new "stream isolation" feature to improve Tor's
8457 security, and provides client-side support for the microdescriptor
8458 and optimistic data features introduced earlier in the 0.2.3.x
8459 series. It also includes numerous critical bugfixes in the (optional)
8460 bufferevent-based networking backend.
8462 o Major features (stream isolation):
8463 - You can now configure Tor so that streams from different
8464 applications are isolated on different circuits, to prevent an
8465 attacker who sees your streams as they leave an exit node from
8466 linking your sessions to one another. To do this, choose some way
8467 to distinguish the applications: have them connect to different
8468 SocksPorts, or have one of them use SOCKS4 while the other uses
8469 SOCKS5, or have them pass different authentication strings to the
8470 SOCKS proxy. Then, use the new SocksPort syntax to configure the
8471 degree of isolation you need. This implements Proposal 171.
8472 - There's a new syntax for specifying multiple client ports (such as
8473 SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
8474 multiple *Port entries with full addr:port syntax on each.
8475 The old *ListenAddress format is still supported, but you can't
8476 mix it with the new *Port syntax.
8478 o Major features (other):
8479 - Enable microdescriptor fetching by default for clients. This allows
8480 clients to download a much smaller amount of directory information.
8481 To disable it (and go back to the old-style consensus and
8482 descriptors), set "UseMicrodescriptors 0" in your torrc file.
8483 - Tor's firewall-helper feature, introduced in 0.2.3.1-alpha (see the
8484 "PortForwarding" config option), now supports Windows.
8485 - When using an exit relay running 0.2.3.x, clients can now
8486 "optimistically" send data before the exit relay reports that
8487 the stream has opened. This saves a round trip when starting
8488 connections where the client speaks first (such as web browsing).
8489 This behavior is controlled by a consensus parameter (currently
8490 disabled). To turn it on or off manually, use the "OptimisticData"
8491 torrc option. Implements proposal 181; code by Ian Goldberg.
8493 o Major bugfixes (bufferevents, fixes on 0.2.3.1-alpha):
8494 - When using IOCP on Windows, we need to enable Libevent windows
8496 - The IOCP backend now works even when the user has not specified
8497 the (internal, debugging-only) _UseFilteringSSLBufferevents option.
8498 Fixes part of bug 3752.
8499 - Correctly record the bytes we've read and written when using
8500 bufferevents, so that we can include them in our bandwidth history
8501 and advertised bandwidth. Fixes bug 3803.
8502 - Apply rate-limiting only at the bottom of a chain of filtering
8503 bufferevents. This prevents us from filling up internal read
8504 buffers and violating rate-limits when filtering bufferevents
8505 are enabled. Fixes part of bug 3804.
8506 - Add high-watermarks to the output buffers for filtered
8507 bufferevents. This prevents us from filling up internal write
8508 buffers and wasting CPU cycles when filtering bufferevents are
8509 enabled. Fixes part of bug 3804.
8510 - Correctly notice when data has been written from a bufferevent
8511 without flushing it completely. Fixes bug 3805.
8512 - Fix a bug where server-side tunneled bufferevent-based directory
8513 streams would get closed prematurely. Fixes bug 3814.
8514 - Fix a use-after-free error with per-connection rate-limiting
8515 buckets. Fixes bug 3888.
8517 o Major bugfixes (also part of 0.2.2.31-rc):
8518 - If we're configured to write our ControlPorts to disk, only write
8519 them after switching UID and creating the data directory. This way,
8520 we don't fail when starting up with a nonexistent DataDirectory
8521 and a ControlPortWriteToFile setting based on that directory. Fixes
8522 bug 3747; bugfix on Tor 0.2.2.26-beta.
8525 - Added a new CONF_CHANGED event so that controllers can be notified
8526 of any configuration changes made by other controllers, or by the
8527 user. Implements ticket 1692.
8528 - Use evbuffer_copyout() in inspect_evbuffer(). This fixes a memory
8529 leak when using bufferevents, and lets Libevent worry about how to
8530 best copy data out of a buffer.
8531 - Replace files in stats/ rather than appending to them. Now that we
8532 include statistics in extra-info descriptors, it makes no sense to
8533 keep old statistics forever. Implements ticket 2930.
8535 o Minor features (build compatibility):
8536 - Limited, experimental support for building with nmake and MSVC.
8537 - Provide a substitute implementation of lround() for MSVC, which
8538 apparently lacks it. Patch from Gisle Vanem.
8540 o Minor features (also part of 0.2.2.31-rc):
8541 - Update to the August 2 2011 Maxmind GeoLite Country database.
8543 o Minor bugfixes (on 0.2.3.x-alpha):
8544 - Fix a spurious warning when parsing SOCKS requests with
8545 bufferevents enabled. Fixes bug 3615; bugfix on 0.2.3.2-alpha.
8546 - Get rid of a harmless warning that could happen on relays running
8547 with bufferevents. The warning was caused by someone doing an http
8548 request to a relay's orport. Also don't warn for a few related
8549 non-errors. Fixes bug 3700; bugfix on 0.2.3.1-alpha.
8551 o Minor bugfixes (on 2.2.x and earlier):
8552 - Correct the man page to explain that HashedControlPassword and
8553 CookieAuthentication can both be set, in which case either method
8554 is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
8555 when we decided to allow these config options to both be set. Issue
8557 - The "--quiet" and "--hush" options now apply not only to Tor's
8558 behavior before logs are configured, but also to Tor's behavior in
8559 the absense of configured logs. Fixes bug 3550; bugfix on
8562 o Minor bugfixes (also part of 0.2.2.31-rc):
8563 - Write several files in text mode, on OSes that distinguish text
8564 mode from binary mode (namely, Windows). These files are:
8565 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
8566 that collect those statistics; 'client_keys' and 'hostname' for
8567 hidden services that use authentication; and (in the tor-gencert
8568 utility) newly generated identity and signing keys. Previously,
8569 we wouldn't specify text mode or binary mode, leading to an
8570 assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
8571 the DirRecordUsageByCountry option which would have triggered
8572 the assertion failure was added), although this assertion failure
8573 would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
8574 - Selectively disable deprecation warnings on OS X because Lion
8575 started deprecating the shipped copy of openssl. Fixes bug 3643.
8576 - Remove an extra pair of quotation marks around the error
8577 message in control-port STATUS_GENERAL BUG events. Bugfix on
8578 0.1.2.6-alpha; fixes bug 3732.
8579 - When unable to format an address as a string, report its value
8580 as "???" rather than reusing the last formatted address. Bugfix
8583 o Code simplifications and refactoring:
8584 - Rewrite the listener-selection logic so that parsing which ports
8585 we want to listen on is now separate from binding to the ports
8589 - Building Tor with bufferevent support now requires Libevent
8590 2.0.13-stable or later. Previous versions of Libevent had bugs in
8591 SSL-related bufferevents and related issues that would make Tor
8592 work badly with bufferevents. Requiring 2.0.13-stable also allows
8593 Tor with bufferevents to take advantage of Libevent APIs
8594 introduced after 2.0.8-rc.
8597 Changes in version 0.2.2.32 - 2011-08-27
8598 The Tor 0.2.2 release series is dedicated to the memory of Andreas
8599 Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
8600 a founder of the PETS community, a leader in our field, a mentor,
8601 and a friend. He left us with these words: "I had the possibility
8602 to contribute to this world that is not as it should be. I hope I
8603 could help in some areas to make the world a better place, and that
8604 I could also encourage other people to be engaged in improving the
8605 world. Please, stay engaged. This world needs you, your love, your
8606 initiative -- now I cannot be part of that anymore."
8608 Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
8609 ready. More than two years in the making, this release features improved
8610 client performance and hidden service reliability, better compatibility
8611 for Android, correct behavior for bridges that listen on more than
8612 one address, more extensible and flexible directory object handling,
8613 better reporting of network statistics, improved code security, and
8614 many many other features and bugfixes.
8617 Changes in version 0.2.2.31-rc - 2011-08-17
8618 Tor 0.2.2.31-rc is the second and hopefully final release candidate
8619 for the Tor 0.2.2.x series.
8622 - Remove an extra pair of quotation marks around the error
8623 message in control-port STATUS_GENERAL BUG events. Bugfix on
8624 0.1.2.6-alpha; fixes bug 3732.
8625 - If we're configured to write our ControlPorts to disk, only write
8626 them after switching UID and creating the data directory. This way,
8627 we don't fail when starting up with a nonexistent DataDirectory
8628 and a ControlPortWriteToFile setting based on that directory. Fixes
8629 bug 3747; bugfix on Tor 0.2.2.26-beta.
8632 - Update to the August 2 2011 Maxmind GeoLite Country database.
8635 - Allow GETINFO fingerprint to return a fingerprint even when
8636 we have not yet built a router descriptor. Fixes bug 3577;
8637 bugfix on 0.2.0.1-alpha.
8638 - Write several files in text mode, on OSes that distinguish text
8639 mode from binary mode (namely, Windows). These files are:
8640 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
8641 that collect those statistics; 'client_keys' and 'hostname' for
8642 hidden services that use authentication; and (in the tor-gencert
8643 utility) newly generated identity and signing keys. Previously,
8644 we wouldn't specify text mode or binary mode, leading to an
8645 assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
8646 the DirRecordUsageByCountry option which would have triggered
8647 the assertion failure was added), although this assertion failure
8648 would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
8649 - Selectively disable deprecation warnings on OS X because Lion
8650 started deprecating the shipped copy of openssl. Fixes bug 3643.
8651 - When unable to format an address as a string, report its value
8652 as "???" rather than reusing the last formatted address. Bugfix
8656 Changes in version 0.2.3.2-alpha - 2011-07-18
8657 Tor 0.2.3.2-alpha introduces two new experimental features:
8658 microdescriptors and pluggable transports. It also continues cleaning
8659 up a variety of recently introduced features.
8662 - Clients can now use microdescriptors instead of regular descriptors
8663 to build circuits. Microdescriptors are authority-generated
8664 summaries of regular descriptors' contents, designed to change
8665 very rarely (see proposal 158 for details). This feature is
8666 designed to save bandwidth, especially for clients on slow internet
8667 connections. It's off by default for now, since nearly no caches
8668 support it, but it will be on-by-default for clients in a future
8669 version. You can use the UseMicrodescriptors option to turn it on.
8670 - Tor clients using bridges can now be configured to use a separate
8671 'transport' proxy for each bridge. This approach helps to resist
8672 censorship by allowing bridges to use protocol obfuscation
8673 plugins. It implements part of proposal 180. Implements ticket 2841.
8674 - While we're trying to bootstrap, record how many TLS connections
8675 fail in each state, and report which states saw the most failures
8676 in response to any bootstrap failures. This feature may speed up
8677 diagnosis of censorship events. Implements ticket 3116.
8679 o Major bugfixes (on 0.2.3.1-alpha):
8680 - When configuring a large set of nodes in EntryNodes (as with
8681 'EntryNodes {cc}' or 'EntryNodes 1.1.1.1/16'), choose only a
8682 random subset to be guards, and choose them in random
8683 order. Fixes bug 2798.
8684 - Tor could crash when remembering a consensus in a non-used consensus
8685 flavor without having a current consensus set. Fixes bug 3361.
8686 - Comparing an unknown address to a microdescriptor's shortened exit
8687 policy would always give a "rejected" result. Fixes bug 3599.
8688 - Using microdescriptors as a client no longer prevents Tor from
8689 uploading and downloading hidden service descriptors. Fixes
8693 - Allow nameservers with IPv6 address. Resolves bug 2574.
8694 - Accept attempts to include a password authenticator in the
8695 handshake, as supported by SOCKS5. This handles SOCKS clients that
8696 don't know how to omit a password when authenticating. Resolves
8698 - When configuring a large set of nodes in EntryNodes, and there are
8699 enough of them listed as Guard so that we don't need to consider
8700 the non-guard entries, prefer the ones listed with the Guard flag.
8701 - Check for and recover from inconsistency in the microdescriptor
8702 cache. This will make it harder for us to accidentally free a
8703 microdescriptor without removing it from the appropriate data
8704 structures. Fixes issue 3135; issue noted by "wanoskarnet".
8705 - Log SSL state transitions at log level DEBUG, log domain
8706 HANDSHAKE. This can be useful for debugging censorship events.
8707 Implements ticket 3264.
8708 - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
8709 implements ticket 3439.
8711 o Minor bugfixes (on 0.2.3.1-alpha):
8712 - Do not free all general-purpose regular descriptors just
8713 because microdescriptor use is enabled. Fixes bug 3113.
8714 - Correctly link libevent_openssl when --enable-static-libevent
8715 is passed to configure. Fixes bug 3118.
8716 - Bridges should not complain during their heartbeat log messages that
8717 they are unlisted in the consensus: that's more or less the point
8718 of being a bridge. Fixes bug 3183.
8719 - Report a SIGNAL event to controllers when acting on a delayed
8720 SIGNAL NEWNYM command. Previously, we would report a SIGNAL
8721 event to the controller if we acted on a SIGNAL NEWNYM command
8722 immediately, and otherwise not report a SIGNAL event for the
8723 command at all. Fixes bug 3349.
8724 - Fix a crash when handling the SIGNAL controller command or
8725 reporting ERR-level status events with bufferevents enabled. Found
8726 by Robert Ransom. Fixes bug 3367.
8727 - Always ship the tor-fw-helper manpage in our release tarballs.
8728 Fixes bug 3389. Reported by Stephen Walker.
8729 - Fix a class of double-mark-for-close bugs when bufferevents
8730 are enabled. Fixes bug 3403.
8731 - Update tor-fw-helper to support libnatpmp-20110618. Fixes bug 3434.
8732 - Add SIGNAL to the list returned by the 'GETINFO events/names'
8733 control-port command. Fixes part of bug 3465.
8734 - Prevent using negative indices during unit test runs when read_all()
8735 fails. Spotted by coverity.
8736 - Fix a rare memory leak when checking the nodelist without it being
8737 present. Found by coverity.
8738 - Only try to download a microdescriptor-flavored consensus from
8739 a directory cache that provides them.
8741 o Minor bugfixes (on 0.2.2.x and earlier):
8742 - Assert that hidden-service-related operations are not performed
8743 using single-hop circuits. Previously, Tor would assert that
8744 client-side streams are not attached to single-hop circuits,
8745 but not that other sensitive operations on the client and service
8746 side are not performed using single-hop circuits. Fixes bug 3332;
8748 - Don't publish a new relay descriptor when we reload our onion key,
8749 unless the onion key has actually changed. Fixes bug 3263 and
8750 resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
8751 - Allow GETINFO fingerprint to return a fingerprint even when
8752 we have not yet built a router descriptor. Fixes bug 3577;
8753 bugfix on 0.2.0.1-alpha.
8754 - Make 'tor --digests' list hashes of all Tor source files. Bugfix
8755 on 0.2.2.4-alpha; fixes bug 3427.
8757 o Code simplification and refactoring:
8758 - Use tor_sscanf() in place of scanf() in more places through the
8759 code. This makes us a little more locale-independent, and
8760 should help shut up code-analysis tools that can't tell
8761 a safe sscanf string from a dangerous one.
8762 - Use tt_assert(), not tor_assert(), for checking for test failures.
8763 This makes the unit tests more able to go on in the event that
8765 - Split connection_about_to_close() into separate functions for each
8769 - On Windows, we now define the _WIN32_WINNT macros only if they
8770 are not already defined. This lets the person building Tor decide,
8771 if they want, to require a later version of Windows.
8774 Changes in version 0.2.2.30-rc - 2011-07-07
8775 Tor 0.2.2.30-rc is the first release candidate for the Tor 0.2.2.x
8776 series. It fixes a few smaller bugs, but generally appears stable.
8777 Please test it and let us know whether it is!
8780 - Send a SUCCEEDED stream event to the controller when a reverse
8781 resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
8782 discovered by katmagic.
8783 - Always NUL-terminate the sun_path field of a sockaddr_un before
8784 passing it to the kernel. (Not a security issue: kernels are
8785 smart enough to reject bad sockaddr_uns.) Found by Coverity;
8786 CID #428. Bugfix on Tor 0.2.0.3-alpha.
8787 - Don't stack-allocate the list of supplementary GIDs when we're
8788 about to log them. Stack-allocating NGROUPS_MAX gid_t elements
8789 could take up to 256K, which is way too much stack. Found by
8790 Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
8791 - Add BUILDTIMEOUT_SET to the list returned by the 'GETINFO
8792 events/names' control-port command. Bugfix on 0.2.2.9-alpha;
8793 fixes part of bug 3465.
8794 - Fix a memory leak when receiving a descriptor for a hidden
8795 service we didn't ask for. Found by Coverity; CID #30. Bugfix
8799 - Update to the July 1 2011 Maxmind GeoLite Country database.
8802 Changes in version 0.2.2.29-beta - 2011-06-20
8803 Tor 0.2.2.29-beta reverts an accidental behavior change for users who
8804 have bridge lines in their torrc but don't want to use them; gets
8805 us closer to having the control socket feature working on Debian;
8806 and fixes a variety of smaller bugs.
8809 - Revert the UseBridges option to its behavior before 0.2.2.28-beta.
8810 When we changed the default behavior to "use bridges if any
8811 are listed in the torrc", we surprised users who had bridges
8812 in their torrc files but who didn't actually want to use them.
8813 Partial resolution for bug 3354.
8816 - Don't attach new streams to old rendezvous circuits after SIGNAL
8817 NEWNYM. Previously, we would keep using an existing rendezvous
8818 circuit if it remained open (i.e. if it were kept open by a
8819 long-lived stream, or if a new stream were attached to it before
8820 Tor could notice that it was old and no longer in use). Bugfix on
8821 0.1.1.15-rc; fixes bug 3375.
8824 - Fix a bug when using ControlSocketsGroupWritable with User. The
8825 directory's group would be checked against the current group, not
8826 the configured group. Patch by Jérémy Bobbio. Fixes bug 3393;
8827 bugfix on 0.2.2.26-beta.
8828 - Make connection_printf_to_buf()'s behavior sane. Its callers
8829 expect it to emit a CRLF iff the format string ends with CRLF;
8830 it actually emitted a CRLF iff (a) the format string ended with
8831 CRLF or (b) the resulting string was over 1023 characters long or
8832 (c) the format string did not end with CRLF *and* the resulting
8833 string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
8834 fixes part of bug 3407.
8835 - Make send_control_event_impl()'s behavior sane. Its callers
8836 expect it to always emit a CRLF at the end of the string; it
8837 might have emitted extra control characters as well. Bugfix on
8838 0.1.1.9-alpha; fixes another part of bug 3407.
8839 - Make crypto_rand_int() check the value of its input correctly.
8840 Previously, it accepted values up to UINT_MAX, but could return a
8841 negative number if given a value above INT_MAX+1. Found by George
8842 Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
8843 - Avoid a segfault when reading a malformed circuit build state
8844 with more than INT_MAX entries. Found by wanoskarnet. Bugfix on
8846 - When asked about a DNS record type we don't support via a
8847 client DNSPort, reply with NOTIMPL rather than an empty
8848 reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
8849 - Fix a rare memory leak during stats writing. Found by coverity.
8852 - Update to the June 1 2011 Maxmind GeoLite Country database.
8854 o Code simplifications and refactoring:
8855 - Remove some dead code as indicated by coverity.
8856 - Remove a few dead assignments during router parsing. Found by
8858 - Add some forgotten return value checks during unit tests. Found
8860 - Don't use 1-bit wide signed bit fields. Found by coverity.
8863 Changes in version 0.2.2.28-beta - 2011-06-04
8864 Tor 0.2.2.28-beta makes great progress towards a new stable release: we
8865 fixed a big bug in whether relays stay in the consensus consistently,
8866 we moved closer to handling bridges and hidden services correctly,
8867 and we started the process of better handling the dreaded "my Vidalia
8868 died, and now my Tor demands a password when I try to reconnect to it"
8872 - Don't decide to make a new descriptor when receiving a HUP signal.
8873 This bug has caused a lot of 0.2.2.x relays to disappear from the
8874 consensus periodically. Fixes the most common case of triggering
8875 bug 1810; bugfix on 0.2.2.7-alpha.
8876 - Actually allow nameservers with IPv6 addresses. Fixes bug 2574.
8877 - Don't try to build descriptors if "ORPort auto" is set and we
8878 don't know our actual ORPort yet. Fix for bug 3216; bugfix on
8880 - Resolve a crash that occurred when setting BridgeRelay to 1 with
8881 accounting enabled. Fixes bug 3228; bugfix on 0.2.2.18-alpha.
8882 - Apply circuit timeouts to opened hidden-service-related circuits
8883 based on the correct start time. Previously, we would apply the
8884 circuit build timeout based on time since the circuit's creation;
8885 it was supposed to be applied based on time since the circuit
8886 entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
8887 - Use the same circuit timeout for client-side introduction
8888 circuits as for other four-hop circuits, rather than the timeout
8889 for single-hop directory-fetch circuits; the shorter timeout may
8890 have been appropriate with the static circuit build timeout in
8891 0.2.1.x and earlier, but caused many hidden service access attempts
8892 to fail with the adaptive CBT introduced in 0.2.2.2-alpha. Bugfix
8893 on 0.2.2.2-alpha; fixes another part of bug 1297.
8894 - In ticket 2511 we fixed a case where you could use an unconfigured
8895 bridge if you had configured it as a bridge the last time you ran
8896 Tor. Now fix another edge case: if you had configured it as a bridge
8897 but then switched to a different bridge via the controller, you
8898 would still be willing to use the old one. Bugfix on 0.2.0.1-alpha;
8902 - Add an __OwningControllerProcess configuration option and a
8903 TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
8904 that when it exits, Tor will shut down. Implements feature 3049.
8905 - If "UseBridges 1" is set and no bridges are configured, Tor will
8906 now refuse to build any circuits until some bridges are set.
8907 If "UseBridges auto" is set, Tor will use bridges if they are
8908 configured and we are not running as a server, but otherwise will
8909 make circuits as usual. The new default is "auto". Patch by anonym,
8910 so the Tails LiveCD can stop automatically revealing you as a Tor
8914 - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
8915 - Remove a trailing asterisk from "exit-policy/default" in the
8916 output of the control port command "GETINFO info/names". Bugfix
8918 - Use a wide type to hold sockets when built for 64-bit Windows builds.
8920 - Warn when the user configures two HiddenServiceDir lines that point
8921 to the same directory. Bugfix on 0.0.6 (the version introducing
8922 HiddenServiceDir); fixes bug 3289.
8923 - Remove dead code from rend_cache_lookup_v2_desc_as_dir. Fixes
8924 part of bug 2748; bugfix on 0.2.0.10-alpha.
8925 - Log malformed requests for rendezvous descriptors as protocol
8926 warnings, not warnings. Also, use a more informative log message
8927 in case someone sees it at log level warning without prior
8928 info-level messages. Fixes the other part of bug 2748; bugfix
8930 - Clear the table recording the time of the last request for each
8931 hidden service descriptor from each HS directory on SIGNAL NEWNYM.
8932 Previously, we would clear our HS descriptor cache on SIGNAL
8933 NEWNYM, but if we had previously retrieved a descriptor (or tried
8934 to) from every directory responsible for it, we would refuse to
8935 fetch it again for up to 15 minutes. Bugfix on 0.2.2.25-alpha;
8937 - Fix a log message that said "bits" while displaying a value in
8938 bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
8940 - When checking for 1024-bit keys, check for 1024 bits, not 128
8941 bytes. This allows Tor to correctly discard keys of length 1017
8942 through 1023. Bugfix on 0.0.9pre5.
8945 - Relays now log the reason for publishing a new relay descriptor,
8946 so we have a better chance of hunting down instances of bug 1810.
8947 Resolves ticket 3252.
8948 - Revise most log messages that refer to nodes by nickname to
8949 instead use the "$key=nickname at address" format. This should be
8950 more useful, especially since nicknames are less and less likely
8951 to be unique. Resolves ticket 3045.
8952 - Log (at info level) when purging pieces of hidden-service-client
8953 state because of SIGNAL NEWNYM.
8956 - Remove undocumented option "-F" from tor-resolve: it hasn't done
8957 anything since 0.2.1.16-rc.
8960 Changes in version 0.2.2.27-beta - 2011-05-18
8961 Tor 0.2.2.27-beta fixes a bridge-related stability bug in the previous
8962 release, and also adds a few more general bugfixes.
8965 - Fix a crash bug when changing bridges in a running Tor process.
8966 Fixes bug 3213; bugfix on 0.2.2.26-beta.
8967 - When the controller configures a new bridge, don't wait 10 to 60
8968 seconds before trying to fetch its descriptor. Bugfix on
8969 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
8972 - Require that onion keys have exponent 65537 in microdescriptors too.
8973 Fixes more of bug 3207; bugfix on 0.2.2.26-beta.
8974 - Tor used to limit HttpProxyAuthenticator values to 48 characters.
8975 Changed the limit to 512 characters by removing base64 newlines.
8976 Fixes bug 2752. Fix by Michael Yakubovich.
8977 - When a client starts or stops using bridges, never use a circuit
8978 that was built before the configuration change. This behavior could
8979 put at risk a user who uses bridges to ensure that her traffic
8980 only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
8984 Changes in version 0.2.2.26-beta - 2011-05-17
8985 Tor 0.2.2.26-beta fixes a variety of potential privacy problems. It
8986 also introduces a new "socksport auto" approach that should make it
8987 easier to run multiple Tors on the same system, and does a lot of
8988 cleanup to get us closer to a release candidate.
8990 o Security/privacy fixes:
8991 - Replace all potentially sensitive memory comparison operations
8992 with versions whose runtime does not depend on the data being
8993 compared. This will help resist a class of attacks where an
8994 adversary can use variations in timing information to learn
8995 sensitive data. Fix for one case of bug 3122. (Safe memcmp
8996 implementation by Robert Ransom based partially on code by DJB.)
8997 - When receiving a hidden service descriptor, check that it is for
8998 the hidden service we wanted. Previously, Tor would store any
8999 hidden service descriptors that a directory gave it, whether it
9000 wanted them or not. This wouldn't have let an attacker impersonate
9001 a hidden service, but it did let directories pre-seed a client
9002 with descriptors that it didn't want. Bugfix on 0.0.6.
9003 - On SIGHUP, do not clear out all TrackHostExits mappings, client
9004 DNS cache entries, and virtual address mappings: that's what
9005 NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
9008 - The options SocksPort, ControlPort, and so on now all accept a
9009 value "auto" that opens a socket on an OS-selected port. A
9010 new ControlPortWriteToFile option tells Tor to write its
9011 actual control port or ports to a chosen file. If the option
9012 ControlPortFileGroupReadable is set, the file is created as
9013 group-readable. Now users can run two Tor clients on the same
9014 system without needing to manually mess with parameters. Resolves
9015 part of ticket 3076.
9016 - Set SO_REUSEADDR on all sockets, not just listeners. This should
9017 help busy exit nodes avoid running out of useable ports just
9018 because all the ports have been used in the near past. Resolves
9022 - New "GETINFO net/listeners/(type)" controller command to return
9023 a list of addresses and ports that are bound for listeners for a
9024 given connection type. This is useful when the user has configured
9025 "SocksPort auto" and the controller needs to know which port got
9026 chosen. Resolves another part of ticket 3076.
9027 - Add a new ControlSocketsGroupWritable configuration option: when
9028 it is turned on, ControlSockets are group-writeable by the default
9029 group of the current user. Patch by Jérémy Bobbio; implements
9031 - Tor now refuses to create a ControlSocket in a directory that is
9032 world-readable (or group-readable if ControlSocketsGroupWritable
9033 is 0). This is necessary because some operating systems do not
9034 enforce permissions on an AF_UNIX sockets. Permissions on the
9035 directory holding the socket, however, seems to work everywhere.
9036 - Rate-limit a warning about failures to download v2 networkstatus
9037 documents. Resolves part of bug 1352.
9038 - Backport code from 0.2.3.x that allows directory authorities to
9039 clean their microdescriptor caches. Needed to resolve bug 2230.
9040 - When an HTTPS proxy reports "403 Forbidden", we now explain
9041 what it means rather than calling it an unexpected status code.
9042 Closes bug 2503. Patch from Michael Yakubovich.
9043 - Update to the May 1 2011 Maxmind GeoLite Country database.
9046 - Authorities now clean their microdesc cache periodically and when
9047 reading from disk initially, not only when adding new descriptors.
9048 This prevents a bug where we could lose microdescriptors. Bugfix
9049 on 0.2.2.6-alpha. Fixes bug 2230.
9050 - Do not crash when our configuration file becomes unreadable, for
9051 example due to a permissions change, between when we start up
9052 and when a controller calls SAVECONF. Fixes bug 3135; bugfix
9054 - Avoid a bug that would keep us from replacing a microdescriptor
9055 cache on Windows. (We would try to replace the file while still
9056 holding it open. That's fine on Unix, but Windows doesn't let us
9057 do that.) Bugfix on 0.2.2.6-alpha; bug found by wanoskarnet.
9058 - Add missing explanations for the authority-related torrc options
9059 RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey in the
9060 man page. Resolves issue 2379.
9061 - As an authority, do not upload our own vote or signature set to
9062 ourself. It would tell us nothing new, and as of 0.2.2.24-alpha,
9063 it would get flagged as a duplicate. Resolves bug 3026.
9064 - Accept hidden service descriptors if we think we might be a hidden
9065 service directory, regardless of what our consensus says. This
9066 helps robustness, since clients and hidden services can sometimes
9067 have a more up-to-date view of the network consensus than we do,
9068 and if they think that the directory authorities list us a HSDir,
9069 we might actually be one. Related to bug 2732; bugfix on
9071 - When a controller changes TrackHostExits, remove mappings for
9072 hosts that should no longer have their exits tracked. Bugfix on
9074 - When a controller changes VirtualAddrNetwork, remove any mappings
9075 for hosts that were automapped to the old network. Bugfix on
9077 - When a controller changes one of the AutomapHosts* options, remove
9078 any mappings for hosts that should no longer be automapped. Bugfix
9080 - Do not reset the bridge descriptor download status every time we
9081 re-parse our configuration or get a configuration change. Fixes
9082 bug 3019; bugfix on 0.2.0.3-alpha.
9084 o Minor bugfixes (code cleanup):
9085 - When loading the microdesc journal, remember its current size.
9086 In 0.2.2, this helps prevent the microdesc journal from growing
9087 without limit on authorities (who are the only ones to use it in
9088 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
9089 Fix posted by "cypherpunks."
9090 - The microdesc journal is supposed to get rebuilt only if it is
9091 at least _half_ the length of the store, not _twice_ the length
9092 of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
9093 - Fix a potential null-pointer dereference while computing a
9094 consensus. Bugfix on tor-0.2.0.3-alpha, found with the help of
9096 - Avoid a possible null-pointer dereference when rebuilding the mdesc
9097 cache without actually having any descriptors to cache. Bugfix on
9098 0.2.2.6-alpha. Issue discovered using clang's static analyzer.
9099 - If we fail to compute the identity digest of a v3 legacy keypair,
9100 warn, and don't use a buffer-full of junk instead. Bugfix on
9101 0.2.1.1-alpha; fixes bug 3106.
9102 - Resolve an untriggerable issue in smartlist_string_num_isin(),
9103 where if the function had ever in the future been used to check
9104 for the presence of a too-large number, it would have given an
9105 incorrect result. (Fortunately, we only used it for 16-bit
9106 values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
9107 - Require that introduction point keys and onion handshake keys
9108 have a public exponent of 65537. Starts to fix bug 3207; bugfix
9112 - Caches no longer download and serve v2 networkstatus documents
9113 unless FetchV2Networkstatus flag is set: these documents haven't
9114 haven't been used by clients or relays since 0.2.0.x. Resolves
9118 Changes in version 0.2.3.1-alpha - 2011-05-05
9119 Tor 0.2.3.1-alpha adds some new experimental features, including support
9120 for an improved network IO backend, IOCP networking on Windows,
9121 microdescriptor caching, "fast-start" support for streams, and automatic
9122 home router configuration. There are also numerous internal improvements
9123 to try to make the code easier for developers to work with.
9125 This is the first alpha release in a new series, so expect there to be
9126 bugs. Users who would rather test out a more stable branch should
9127 stay with 0.2.2.x for now.
9130 - Tor can now optionally build with the "bufferevents" buffered IO
9131 backend provided by Libevent 2. To use this feature, make sure you
9132 have the latest possible version of Libevent, and pass the
9133 --enable-bufferevents flag to configure when building Tor from
9134 source. This feature will make our networking code more flexible,
9135 let us stack layers on each other, and let us use more efficient
9136 zero-copy transports where available.
9137 - As an experimental feature, Tor can use IOCP for networking on Windows.
9138 Once this code is tuned and optimized, it promises much better
9139 performance than the select-based backend we've used in the past. To
9140 try this feature, you must build Tor with Libevent 2, configure Tor
9141 with the "bufferevents" buffered IO backend, and add "DisableIOCP 0" to
9142 your torrc. There are known bugs here: only try this if you can help
9143 debug it as it breaks.
9144 - The EntryNodes option can now include country codes like {de} or IP
9145 addresses or network masks. Previously we had disallowed these options
9146 because we didn't have an efficient way to keep the list up to
9147 date. Fixes bug 1982, but see bug 2798 for an unresolved issue here.
9148 - Exit nodes now accept and queue data on not-yet-connected streams.
9149 Previously, the client wasn't allowed to send data until the stream was
9150 connected, which slowed down all connections. This change will enable
9151 clients to perform a "fast-start" on streams and send data without
9152 having to wait for a confirmation that the stream has opened. (Patch
9153 from Ian Goldberg; implements the server side of Proposal 174.)
9154 - Tor now has initial support for automatic port mapping on the many
9155 home routers that support NAT-PMP or UPnP. (Not yet supported on
9156 Windows). To build the support code, you'll need to have libnatpnp
9157 library and/or the libminiupnpc library, and you'll need to enable the
9158 feature specifically by passing "--enable-upnp" and/or
9159 "--enable-natpnp" to configure. To turn it on, use the new
9160 PortForwarding option.
9161 - Caches now download, cache, and serve multiple "flavors" of the
9162 consensus, including a flavor that describes microdescriptors.
9163 - Caches now download, cache, and serve microdescriptors -- small
9164 summaries of router descriptors that are authenticated by all of the
9165 directory authorities. Once enough caches are running this code,
9166 clients will be able to save significant amounts of directory bandwidth
9167 by downloading microdescriptors instead of router descriptors.
9170 - Make logging resolution configurable with a new LogTimeGranularity
9171 option, and change the default from 1 millisecond to 1 second.
9172 Implements enhancement 1668.
9173 - We log which torrc file we're using on startup. Implements ticket
9175 - Ordinarily, Tor does not count traffic from private addresses (like
9176 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
9177 There is now a new option, CountPrivateBandwidth, to disable this
9178 behavior. Patch from Daniel Cagara.
9179 - New --enable-static-tor configure option for building Tor as
9180 statically as possible. Idea, general hackery and thoughts from
9181 Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
9183 - If you set the NumCPUs option to 0, Tor will now try to detect how
9184 many CPUs you have. This is the new default behavior.
9185 - Turn on directory request statistics by default and include them in
9186 extra-info descriptors. Don't break if we have no GeoIP database.
9187 - Relays that set "ConnDirectionStatistics 1" write statistics on the
9188 bidirectional use of connections to disk every 24 hours.
9189 - Add a GeoIP file digest to the extra-info descriptor. Implements
9191 - The NodeFamily option -- which let you declare that you want to
9192 consider nodes to be part of a family whether they list themselves
9193 that way or not -- now allows IP address ranges and country codes.
9194 - Add a new 'Heartbeat' log message type to periodically log a message
9195 describing Tor's status at level Notice. This feature is meant for
9196 operators who log at notice, and want to make sure that their Tor
9197 server is still working. Implementation by George Kadianakis.
9199 o Minor bugfixes (on 0.2.2.25-alpha):
9200 - When loading the microdesc journal, remember its current size.
9201 In 0.2.2, this helps prevent the microdesc journal from growing
9202 without limit on authorities (who are the only ones to use it in
9203 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
9204 Fix posted by "cypherpunks."
9205 - The microdesc journal is supposed to get rebuilt only if it is
9206 at least _half_ the length of the store, not _twice_ the length
9207 of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
9208 - If as an authority we fail to compute the identity digest of a v3
9209 legacy keypair, warn, and don't use a buffer-full of junk instead.
9210 Bugfix on 0.2.1.1-alpha; fixes bug 3106.
9211 - Authorities now clean their microdesc cache periodically and when
9212 reading from disk initially, not only when adding new descriptors.
9213 This prevents a bug where we could lose microdescriptors. Bugfix
9216 o Minor features (controller):
9217 - Add a new SIGNAL event to the controller interface so that
9218 controllers can be notified when Tor handles a signal. Resolves
9219 issue 1955. Patch by John Brooks.
9220 - Add a new GETINFO option to get total bytes read and written. Patch
9221 from pipe, revised by atagar. Resolves ticket 2345.
9222 - Implement some GETINFO controller fields to provide information about
9223 the Tor process's pid, euid, username, and resource limits.
9226 - Our build system requires automake 1.6 or later to create the
9227 Makefile.in files. Previously, you could have used 1.4.
9228 This only affects developers and people building Tor from git;
9229 people who build Tor from the source distribution without changing
9230 the Makefile.am files should be fine.
9231 - Our autogen.sh script uses autoreconf to launch autoconf, automake, and
9232 so on. This is more robust against some of the failure modes
9233 associated with running the autotools pieces on their own.
9235 o Minor packaging issues:
9236 - On OpenSUSE, create the /var/run/tor directory on startup if it is not
9237 already created. Patch from Andreas Stieger. Fixes bug 2573.
9239 o Code simplifications and refactoring:
9240 - A major revision to our internal node-selecting and listing logic.
9241 Tor already had at least two major ways to look at the question of
9242 "which Tor servers do we know about": a list of router descriptors,
9243 and a list of entries in the current consensus. With
9244 microdescriptors, we're adding a third. Having so many systems
9245 without an abstraction layer over them was hurting the codebase.
9246 Now, we have a new "node_t" abstraction that presents a consistent
9247 interface to a client's view of a Tor node, and holds (nearly) all
9248 of the mutable state formerly in routerinfo_t and routerstatus_t.
9249 - The helper programs tor-gencert, tor-resolve, and tor-checkkey
9250 no longer link against Libevent: they never used it, but
9251 our library structure used to force them to link it.
9254 - Remove some old code to work around even older versions of Tor that
9255 used forked processes to handle DNS requests. Such versions of Tor
9256 are no longer in use as servers.
9258 o Documentation fixes:
9259 - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
9260 - Add missing documentation for the authority-related torrc options
9261 RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey. Resolves
9265 Changes in version 0.2.2.25-alpha - 2011-04-29
9266 Tor 0.2.2.25-alpha fixes many bugs: hidden service clients are more
9267 robust, routers no longer overreport their bandwidth, Win7 should crash
9268 a little less, and NEWNYM (as used by Vidalia's "new identity" button)
9269 now prevents hidden service-related activity from being linkable. It
9270 provides more information to Vidalia so you can see if your bridge is
9271 working. Also, 0.2.2.25-alpha revamps the Entry/Exit/ExcludeNodes and
9272 StrictNodes configuration options to make them more reliable, more
9273 understandable, and more regularly applied. If you use those options,
9274 please see the revised documentation for them in the manual page.
9277 - Relays were publishing grossly inflated bandwidth values because
9278 they were writing their state files wrong--now they write the
9279 correct value. Also, resume reading bandwidth history from the
9280 state file correctly. Fixes bug 2704; bugfix on 0.2.2.23-alpha.
9281 - Improve hidden service robustness: When we find that we have
9282 extended a hidden service's introduction circuit to a relay not
9283 listed as an introduction point in the HS descriptor we currently
9284 have, retry with an introduction point from the current
9285 descriptor. Previously we would just give up. Fixes bugs 1024 and
9286 1930; bugfix on 0.2.0.10-alpha.
9287 - Clients now stop trying to use an exit node associated with a given
9288 destination by TrackHostExits if they fail to reach that exit node.
9289 Fixes bug 2999. Bugfix on 0.2.0.20-rc.
9290 - Fix crash bug on platforms where gmtime and localtime can return
9291 NULL. Windows 7 users were running into this one. Fixes part of bug
9292 2077. Bugfix on all versions of Tor. Found by boboper.
9294 o Security and stability fixes:
9295 - Don't double-free a parsable, but invalid, microdescriptor, even if
9296 it is followed in the blob we're parsing by an unparsable
9297 microdescriptor. Fixes an issue reported in a comment on bug 2954.
9298 Bugfix on 0.2.2.6-alpha; fix by "cypherpunks".
9299 - If the Nickname configuration option isn't given, Tor would pick a
9300 nickname based on the local hostname as the nickname for a relay.
9301 Because nicknames are not very important in today's Tor and the
9302 "Unnamed" nickname has been implemented, this is now problematic
9303 behavior: It leaks information about the hostname without being
9304 useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
9305 introduced the Unnamed nickname. Reported by tagnaq.
9306 - Fix an uncommon assertion failure when running with DNSPort under
9307 heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
9308 - Avoid linkability based on cached hidden service descriptors: forget
9309 all hidden service descriptors cached as a client when processing a
9310 SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
9313 - Export GeoIP information on bridge usage to controllers even if we
9314 have not yet been running for 24 hours. Now Vidalia bridge operators
9315 can get more accurate and immediate feedback about their
9316 contributions to the network.
9318 o Major features and bugfixes (node selection):
9319 - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
9320 ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and StrictNodes
9321 options. Previously, we had been ambiguous in describing what
9322 counted as an "exit" node, and what operations exactly "StrictNodes
9323 0" would permit. This created confusion when people saw nodes built
9324 through unexpected circuits, and made it hard to tell real bugs from
9325 surprises. Now the intended behavior is:
9326 . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
9327 a node that delivers user traffic outside the Tor network.
9328 . "Entry", in the context of EntryNodes, means a node used as the
9329 first hop of a multihop circuit. It doesn't include direct
9330 connections to directory servers.
9331 . "ExcludeNodes" applies to all nodes.
9332 . "StrictNodes" changes the behavior of ExcludeNodes only. When
9333 StrictNodes is set, Tor should avoid all nodes listed in
9334 ExcludeNodes, even when it will make user requests fail. When
9335 StrictNodes is *not* set, then Tor should follow ExcludeNodes
9336 whenever it can, except when it must use an excluded node to
9337 perform self-tests, connect to a hidden service, provide a
9338 hidden service, fulfill a .exit request, upload directory
9339 information, or fetch directory information.
9340 Collectively, the changes to implement the behavior fix bug 1090.
9341 - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
9342 a node is listed in both, it's treated as excluded.
9343 - ExcludeNodes now applies to directory nodes -- as a preference if
9344 StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
9345 Don't exclude all the directory authorities and set StrictNodes to 1
9346 unless you really want your Tor to break.
9347 - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
9348 - ExcludeExitNodes now overrides .exit requests.
9349 - We don't use bridges listed in ExcludeNodes.
9350 - When StrictNodes is 1:
9351 . We now apply ExcludeNodes to hidden service introduction points
9352 and to rendezvous points selected by hidden service users. This
9353 can make your hidden service less reliable: use it with caution!
9354 . If we have used ExcludeNodes on ourself, do not try relay
9355 reachability self-tests.
9356 . If we have excluded all the directory authorities, we will not
9357 even try to upload our descriptor if we're a relay.
9358 . Do not honor .exit requests to an excluded node.
9359 - Remove a misfeature that caused us to ignore the Fast/Stable flags
9360 when ExitNodes is set. Bugfix on 0.2.2.7-alpha.
9361 - When the set of permitted nodes changes, we now remove any mappings
9362 introduced via TrackExitHosts to now-excluded nodes. Bugfix on
9364 - We never cannibalize a circuit that had excluded nodes on it, even
9365 if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
9366 - Revert a change where we would be laxer about attaching streams to
9367 circuits than when building the circuits. This was meant to prevent
9368 a set of bugs where streams were never attachable, but our improved
9369 code here should make this unnecessary. Bugfix on 0.2.2.7-alpha.
9370 - Keep track of how many times we launch a new circuit to handle a
9371 given stream. Too many launches could indicate an inconsistency
9372 between our "launch a circuit to handle this stream" logic and our
9373 "attach this stream to one of the available circuits" logic.
9374 - Improve log messages related to excluded nodes.
9377 - Fix a spurious warning when moving from a short month to a long
9378 month on relays with month-based BandwidthAccounting. Bugfix on
9379 0.2.2.17-alpha; fixes bug 3020.
9380 - When a client finds that an origin circuit has run out of 16-bit
9381 stream IDs, we now mark it as unusable for new streams. Previously,
9382 we would try to close the entire circuit. Bugfix on 0.0.6.
9383 - Add a forgotten cast that caused a compile warning on OS X 10.6.
9384 Bugfix on 0.2.2.24-alpha.
9385 - Be more careful about reporting the correct error from a failed
9386 connect() system call. Under some circumstances, it was possible to
9387 look at an incorrect value for errno when sending the end reason.
9388 Bugfix on 0.1.0.1-rc.
9389 - Correctly handle an "impossible" overflow cases in connection byte
9390 counting, where we write or read more than 4GB on an edge connection
9391 in a single second. Bugfix on 0.1.2.8-beta.
9392 - Correct the warning displayed when a rendezvous descriptor exceeds
9393 the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
9395 - Clients and hidden services now use HSDir-flagged relays for hidden
9396 service descriptor downloads and uploads even if the relays have no
9397 DirPort set and the client has disabled TunnelDirConns. This will
9398 eventually allow us to give the HSDir flag to relays with no
9399 DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
9400 - Downgrade "no current certificates known for authority" message from
9401 Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
9402 - Make the SIGNAL DUMP control-port command work on FreeBSD. Fixes bug
9403 2917. Bugfix on 0.1.1.1-alpha.
9404 - Only limit the lengths of single HS descriptors, even when multiple
9405 HS descriptors are published to an HSDir relay in a single POST
9406 operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
9407 - Write the current time into the LastWritten line in our state file,
9408 rather than the time from the previous write attempt. Also, stop
9409 trying to use a time of -1 in our log statements. Fixes bug 3039;
9410 bugfix on 0.2.2.14-alpha.
9411 - Be more consistent in our treatment of file system paths. "~" should
9412 get expanded to the user's home directory in the Log config option.
9413 Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
9414 feature for the -f and --DataDirectory options.
9417 - Make sure every relay writes a state file at least every 12 hours.
9418 Previously, a relay could go for weeks without writing its state
9419 file, and on a crash could lose its bandwidth history, capacity
9420 estimates, client country statistics, and so on. Addresses bug 3012.
9421 - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
9422 Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
9423 clients are already deprecated because of security bugs.
9424 - Don't allow v0 hidden service authorities to act as clients.
9425 Required by fix for bug 3000.
9426 - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
9427 by fix for bug 3000.
9428 - Ensure that no empty [dirreq-](read|write)-history lines are added
9429 to an extrainfo document. Implements ticket 2497.
9431 o Code simplification and refactoring:
9432 - Remove workaround code to handle directory responses from servers
9433 that had bug 539 (they would send HTTP status 503 responses _and_
9434 send a body too). Since only server versions before
9435 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
9436 keep the workaround in place.
9437 - Remove the old 'fuzzy time' logic. It was supposed to be used for
9438 handling calculations where we have a known amount of clock skew and
9439 an allowed amount of unknown skew. But we only used it in three
9440 places, and we never adjusted the known/unknown skew values. This is
9441 still something we might want to do someday, but if we do, we'll
9442 want to do it differently.
9443 - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
9444 None of the cases where we did this before were wrong, but by making
9445 this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
9446 - Use GetTempDir to find the proper temporary directory location on
9447 Windows when generating temporary files for the unit tests. Patch by
9451 Changes in version 0.2.2.24-alpha - 2011-04-08
9452 Tor 0.2.2.24-alpha fixes a variety of bugs, including a big bug that
9453 prevented Tor clients from effectively using "multihomed" bridges,
9454 that is, bridges that listen on multiple ports or IP addresses so users
9455 can continue to use some of their addresses even if others get blocked.
9458 - Fix a bug where bridge users who configure the non-canonical
9459 address of a bridge automatically switch to its canonical
9460 address. If a bridge listens at more than one address, it should be
9461 able to advertise those addresses independently and any non-blocked
9462 addresses should continue to work. Bugfix on Tor 0.2.0.x. Fixes
9464 - If you configured Tor to use bridge A, and then quit and
9465 configured Tor to use bridge B instead, it would happily continue
9466 to use bridge A if it's still reachable. While this behavior is
9467 a feature if your goal is connectivity, in some scenarios it's a
9468 dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
9469 - Directory authorities now use data collected from their own
9470 uptime observations when choosing whether to assign the HSDir flag
9471 to relays, instead of trusting the uptime value the relay reports in
9472 its descriptor. This change helps prevent an attack where a small
9473 set of nodes with frequently-changing identity keys can blackhole
9474 a hidden service. (Only authorities need upgrade; others will be
9475 fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
9478 - When we restart our relay, we might get a successful connection
9479 from the outside before we've started our reachability tests,
9480 triggering a warning: "ORPort found reachable, but I have no
9481 routerinfo yet. Failing to inform controller of success." This
9482 bug was harmless unless Tor is running under a controller
9483 like Vidalia, in which case the controller would never get a
9484 REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
9486 - Make directory authorities more accurate at recording when
9487 relays that have failed several reachability tests became
9488 unreachable, so we can provide more accuracy at assigning Stable,
9489 Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
9490 - Fix an issue that prevented static linking of libevent on
9491 some platforms (notably Linux). Fixes bug 2698; bugfix on
9492 versions 0.2.1.23/0.2.2.8-alpha (the versions introducing
9493 the --with-static-libevent configure option).
9494 - We now ask the other side of a stream (the client or the exit)
9495 for more data on that stream when the amount of queued data on
9496 that stream dips low enough. Previously, we wouldn't ask the
9497 other side for more data until either it sent us more data (which
9498 it wasn't supposed to do if it had exhausted its window!) or we
9499 had completely flushed all our queued data. This flow control fix
9500 should improve throughput. Fixes bug 2756; bugfix on the earliest
9501 released versions of Tor (svn commit r152).
9502 - Avoid a double-mark-for-free warning when failing to attach a
9503 transparent proxy connection. (We thought we had fixed this in
9504 0.2.2.23-alpha, but it turns out our fix was checking the wrong
9505 connection.) Fixes bug 2757; bugfix on 0.1.2.1-alpha (the original
9506 bug) and 0.2.2.23-alpha (the incorrect fix).
9507 - When warning about missing zlib development packages during compile,
9508 give the correct package names. Bugfix on 0.2.0.1-alpha.
9511 - Directory authorities now log the source of a rejected POSTed v3
9513 - Make compilation with clang possible when using
9514 --enable-gcc-warnings by removing two warning options that clang
9515 hasn't implemented yet and by fixing a few warnings. Implements
9517 - When expiring circuits, use microsecond timers rather than
9518 one-second timers. This can avoid an unpleasant situation where a
9519 circuit is launched near the end of one second and expired right
9520 near the beginning of the next, and prevent fluctuations in circuit
9522 - Use computed circuit-build timeouts to decide when to launch
9523 parallel introduction circuits for hidden services. (Previously,
9524 we would retry after 15 seconds.)
9525 - Update to the April 1 2011 Maxmind GeoLite Country database.
9528 - Create the /var/run/tor directory on startup on OpenSUSE if it is
9529 not already created. Patch from Andreas Stieger. Fixes bug 2573.
9531 o Documentation changes:
9532 - Modernize the doxygen configuration file slightly. Fixes bug 2707.
9533 - Resolve all doxygen warnings except those for missing documentation.
9535 - Add doxygen documentation for more functions, fields, and types.
9538 Changes in version 0.2.2.23-alpha - 2011-03-08
9539 Tor 0.2.2.23-alpha lets relays record their bandwidth history so when
9540 they restart they don't lose their bandwidth capacity estimate. This
9541 release also fixes a diverse set of user-facing bugs, ranging from
9542 relays overrunning their rate limiting to clients falsely warning about
9543 clock skew to bridge descriptor leaks by our bridge directory authority.
9546 - Stop sending a CLOCK_SKEW controller status event whenever
9547 we fetch directory information from a relay that has a wrong clock.
9548 Instead, only inform the controller when it's a trusted authority
9549 that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
9550 the rest of bug 1074.
9551 - Fix an assert in parsing router descriptors containing IPv6
9552 addresses. This one took down the directory authorities when
9553 somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
9554 - Make the bridge directory authority refuse to answer directory
9555 requests for "all" descriptors. It used to include bridge
9556 descriptors in its answer, which was a major information leak.
9557 Found by "piebeer". Bugfix on 0.2.0.3-alpha.
9558 - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
9559 Tor would ignore their RelayBandwidthBurst setting,
9560 potentially using more bandwidth than expected. Bugfix on
9561 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
9562 - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
9563 hidserv" in her torrc. The 'hidserv' argument never controlled
9564 publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
9567 - Relays now save observed peak bandwidth throughput rates to their
9568 state file (along with total usage, which was already saved)
9569 so that they can determine their correct estimated bandwidth on
9570 restart. Resolves bug 1863, where Tor relays would reset their
9571 estimated bandwidth to 0 after restarting.
9572 - Directory authorities now take changes in router IP address and
9573 ORPort into account when determining router stability. Previously,
9574 if a router changed its IP or ORPort, the authorities would not
9575 treat it as having any downtime for the purposes of stability
9576 calculation, whereas clients would experience downtime since the
9577 change could take a while to propagate to them. Resolves issue 1035.
9578 - Enable Address Space Layout Randomization (ASLR) and Data Execution
9579 Prevention (DEP) by default on Windows to make it harder for
9580 attackers to exploit vulnerabilities. Patch from John Brooks.
9582 o Minor bugfixes (on 0.2.1.x and earlier):
9583 - Fix a rare crash bug that could occur when a client was configured
9584 with a large number of bridges. Fixes bug 2629; bugfix on
9585 0.2.1.2-alpha. Bugfix by trac user "shitlei".
9586 - Avoid a double mark-for-free warning when failing to attach a
9587 transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
9589 - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
9590 found by "cypherpunks". This bug was introduced before the first
9591 Tor release, in svn commit r110.
9592 - Country codes aren't supported in EntryNodes until 0.2.3.x, so
9593 don't mention them in the manpage. Fixes bug 2450; issue
9594 spotted by keb and G-Lo.
9595 - Fix a bug in bandwidth history state parsing that could have been
9596 triggered if a future version of Tor ever changed the timing
9597 granularity at which bandwidth history is measured. Bugfix on
9599 - When a relay decides that its DNS is too broken for it to serve
9600 as an exit server, it advertised itself as a non-exit, but
9601 continued to act as an exit. This could create accidental
9602 partitioning opportunities for users. Instead, if a relay is
9603 going to advertise reject *:* as its exit policy, it should
9604 really act with exit policy "reject *:*". Fixes bug 2366.
9605 Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
9606 - In the special case where you configure a public exit relay as your
9607 bridge, Tor would be willing to use that exit relay as the last
9608 hop in your circuit as well. Now we fail that circuit instead.
9609 Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
9610 - Fix a bug with our locking implementation on Windows that couldn't
9611 correctly detect when a file was already locked. Fixes bug 2504,
9612 bugfix on 0.2.1.6-alpha.
9613 - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
9614 Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
9616 - Set target port in get_interface_address6() correctly. Bugfix
9617 on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
9618 - Directory authorities are now more robust to hops back in time
9619 when calculating router stability. Previously, if a run of uptime
9620 or downtime appeared to be negative, the calculation could give
9621 incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
9623 - Fix an assert that got triggered when using the TestingTorNetwork
9624 configuration option and then issuing a GETINFO config-text control
9625 command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
9627 o Minor bugfixes (on 0.2.2.x):
9628 - Clients should not weight BadExit nodes as Exits in their node
9629 selection. Similarly, directory authorities should not count BadExit
9630 bandwidth as Exit bandwidth when computing bandwidth-weights.
9631 Bugfix on 0.2.2.10-alpha; fixes bug 2203.
9632 - Correctly clear our dir_read/dir_write history when there is an
9633 error parsing any bw history value from the state file. Bugfix on
9635 - Resolve a bug in verifying signatures of directory objects
9636 with digests longer than SHA1. Bugfix on 0.2.2.20-alpha.
9637 Fixes bug 2409. Found by "piebeer".
9638 - Bridge authorities no longer crash on SIGHUP when they try to
9639 publish their relay descriptor to themselves. Fixes bug 2572. Bugfix
9643 - Log less aggressively about circuit timeout changes, and improve
9644 some other circuit timeout messages. Resolves bug 2004.
9645 - Log a little more clearly about the times at which we're no longer
9646 accepting new connections. Resolves bug 2181.
9647 - Reject attempts at the client side to open connections to private
9648 IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
9649 a randomly chosen exit node. Attempts to do so are always
9650 ill-defined, generally prevented by exit policies, and usually
9651 in error. This will also help to detect loops in transparent
9652 proxy configurations. You can disable this feature by setting
9653 "ClientRejectInternalAddresses 0" in your torrc.
9654 - Always treat failure to allocate an RSA key as an unrecoverable
9656 - Update to the March 1 2011 Maxmind GeoLite Country database.
9658 o Minor features (log subsystem):
9659 - Add documentation for configuring logging at different severities in
9660 different log domains. We've had this feature since 0.2.1.1-alpha,
9661 but for some reason it never made it into the manpage. Fixes
9663 - Make it simpler to specify "All log domains except for A and B".
9664 Previously you needed to say "[*,~A,~B]". Now you can just say
9666 - Add a "LogMessageDomains 1" option to include the domains of log
9667 messages along with the messages. Without this, there's no way
9668 to use log domains without reading the source or doing a lot
9671 o Packaging changes:
9672 - Stop shipping the Tor specs files and development proposal documents
9673 in the tarball. They are now in a separate git repository at
9674 git://git.torproject.org/torspec.git
9677 Changes in version 0.2.1.30 - 2011-02-23
9678 Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
9679 change is a slight tweak to Tor's TLS handshake that makes relays
9680 and bridges that run this new version reachable from Iran again.
9681 We don't expect this tweak will win the arms race long-term, but it
9682 buys us time until we roll out a better solution.
9685 - Stop sending a CLOCK_SKEW controller status event whenever
9686 we fetch directory information from a relay that has a wrong clock.
9687 Instead, only inform the controller when it's a trusted authority
9688 that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
9689 the rest of bug 1074.
9690 - Fix a bounds-checking error that could allow an attacker to
9691 remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
9693 - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
9694 Tor would ignore their RelayBandwidthBurst setting,
9695 potentially using more bandwidth than expected. Bugfix on
9696 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
9697 - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
9698 hidserv" in her torrc. The 'hidserv' argument never controlled
9699 publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
9702 - Adjust our TLS Diffie-Hellman parameters to match those used by
9704 - Update to the February 1 2011 Maxmind GeoLite Country database.
9707 - Check for and reject overly long directory certificates and
9708 directory tokens before they have a chance to hit any assertions.
9709 Bugfix on 0.2.1.28. Found by "doorss".
9710 - Bring the logic that gathers routerinfos and assesses the
9711 acceptability of circuits into line. This prevents a Tor OP from
9712 getting locked in a cycle of choosing its local OR as an exit for a
9713 path (due to a .exit request) and then rejecting the circuit because
9714 its OR is not listed yet. It also prevents Tor clients from using an
9715 OR running in the same instance as an exit (due to a .exit request)
9716 if the OR does not meet the same requirements expected of an OR
9717 running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
9719 o Packaging changes:
9720 - Stop shipping the Tor specs files and development proposal documents
9721 in the tarball. They are now in a separate git repository at
9722 git://git.torproject.org/torspec.git
9723 - Do not include Git version tags as though they are SVN tags when
9724 generating a tarball from inside a repository that has switched
9725 between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
9728 Changes in version 0.2.2.22-alpha - 2011-01-25
9729 Tor 0.2.2.22-alpha fixes a few more less-critical security issues. The
9730 main other change is a slight tweak to Tor's TLS handshake that makes
9731 relays and bridges that run this new version reachable from Iran again.
9732 We don't expect this tweak will win the arms race long-term, but it
9733 will buy us a bit more time until we roll out a better solution.
9736 - Fix a bounds-checking error that could allow an attacker to
9737 remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
9739 - Don't assert when changing from bridge to relay or vice versa
9740 via the controller. The assert happened because we didn't properly
9741 initialize our keys in this case. Bugfix on 0.2.2.18-alpha; fixes
9742 bug 2433. Reported by bastik.
9745 - Adjust our TLS Diffie-Hellman parameters to match those used by
9747 - Provide a log message stating which geoip file we're parsing
9748 instead of just stating that we're parsing the geoip file.
9749 Implements ticket 2432.
9752 - Check for and reject overly long directory certificates and
9753 directory tokens before they have a chance to hit any assertions.
9754 Bugfix on 0.2.1.28 / 0.2.2.20-alpha. Found by "doorss".
9757 Changes in version 0.2.2.21-alpha - 2011-01-15
9758 Tor 0.2.2.21-alpha includes all the patches from Tor 0.2.1.29, which
9759 continues our recent code security audit work. The main fix resolves
9760 a remote heap overflow vulnerability that can allow remote code
9761 execution (CVE-2011-0427). Other fixes address a variety of assert
9762 and crash bugs, most of which we think are hard to exploit remotely.
9764 o Major bugfixes (security), also included in 0.2.1.29:
9765 - Fix a heap overflow bug where an adversary could cause heap
9766 corruption. This bug probably allows remote code execution
9767 attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
9769 - Prevent a denial-of-service attack by disallowing any
9770 zlib-compressed data whose compression factor is implausibly
9771 high. Fixes part of bug 2324; reported by "doorss".
9772 - Zero out a few more keys in memory before freeing them. Fixes
9773 bug 2384 and part of bug 2385. These key instances found by
9774 "cypherpunks", based on Andrew Case's report about being able
9775 to find sensitive data in Tor's memory space if you have enough
9776 permissions. Bugfix on 0.0.2pre9.
9778 o Major bugfixes (crashes), also included in 0.2.1.29:
9779 - Prevent calls to Libevent from inside Libevent log handlers.
9780 This had potential to cause a nasty set of crashes, especially
9781 if running Libevent with debug logging enabled, and running
9782 Tor with a controller watching for low-severity log messages.
9783 Bugfix on 0.1.0.2-rc. Fixes bug 2190.
9784 - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
9785 underflow errors there too. Fixes the other part of bug 2324.
9786 - Fix a bug where we would assert if we ever had a
9787 cached-descriptors.new file (or another file read directly into
9788 memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
9789 on 0.2.1.25. Found by doorss.
9790 - Fix some potential asserts and parsing issues with grossly
9791 malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
9794 o Minor bugfixes (other), also included in 0.2.1.29:
9795 - Fix a bug with handling misformed replies to reverse DNS lookup
9796 requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
9797 bug reported by doorss.
9798 - Fix compilation on mingw when a pthreads compatibility library
9799 has been installed. (We don't want to use it, so we shouldn't
9800 be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
9801 - Fix a bug where we would declare that we had run out of virtual
9802 addresses when the address space was only half-exhausted. Bugfix
9804 - Correctly handle the case where AutomapHostsOnResolve is set but
9805 no virtual addresses are available. Fixes bug 2328; bugfix on
9806 0.1.2.1-alpha. Bug found by doorss.
9807 - Correctly handle wrapping around when we run out of virtual
9808 address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
9810 o Minor features, also included in 0.2.1.29:
9811 - Update to the January 1 2011 Maxmind GeoLite Country database.
9812 - Introduce output size checks on all of our decryption functions.
9814 o Build changes, also included in 0.2.1.29:
9815 - Tor does not build packages correctly with Automake 1.6 and earlier;
9816 added a check to Makefile.am to make sure that we're building with
9817 Automake 1.7 or later.
9818 - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
9819 because we built it with a too-old version of automake. Thus that
9820 release broke ./configure --enable-openbsd-malloc, which is popular
9821 among really fast exit relays on Linux.
9823 o Major bugfixes, new in 0.2.2.21-alpha:
9824 - Prevent crash/heap corruption when the cbtnummodes consensus
9825 parameter is set to 0 or large values. Fixes bug 2317; bugfix
9828 o Major features, new in 0.2.2.21-alpha:
9829 - Introduce minimum/maximum values that clients will believe
9830 from the consensus. Now we'll have a better chance to avoid crashes
9831 or worse when a consensus param has a weird value.
9833 o Minor features, new in 0.2.2.21-alpha:
9834 - Make sure to disable DirPort if running as a bridge. DirPorts aren't
9835 used on bridges, and it makes bridge scanning somewhat easier.
9836 - If writing the state file to disk fails, wait up to an hour before
9837 retrying again, rather than trying again each second. Fixes bug
9838 2346; bugfix on Tor 0.1.1.3-alpha.
9839 - Make Libevent log messages get delivered to controllers later,
9840 and not from inside the Libevent log handler. This prevents unsafe
9841 reentrant Libevent calls while still letting the log messages
9843 - Detect platforms that brokenly use a signed size_t, and refuse to
9844 build there. Found and analyzed by doorss and rransom.
9845 - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
9848 o Minor bugfixes, new in 0.2.2.21-alpha:
9849 - Handle SOCKS messages longer than 128 bytes long correctly, rather
9850 than waiting forever for them to finish. Fixes bug 2330; bugfix
9851 on 0.2.0.16-alpha. Found by doorss.
9852 - Add assertions to check for overflow in arguments to
9853 base32_encode() and base32_decode(); fix a signed-unsigned
9854 comparison there too. These bugs are not actually reachable in Tor,
9855 but it's good to prevent future errors too. Found by doorss.
9856 - Correctly detect failures to create DNS requests when using Libevent
9857 versions before v2. (Before Libevent 2, we used our own evdns
9858 implementation. Its return values for Libevent's evdns_resolve_*()
9859 functions are not consistent with those from Libevent.) Fixes bug
9860 2363; bugfix on 0.2.2.6-alpha. Found by "lodger".
9862 o Documentation, new in 0.2.2.21-alpha:
9863 - Document the default socks host and port (127.0.0.1:9050) for
9867 Changes in version 0.2.1.29 - 2011-01-15
9868 Tor 0.2.1.29 continues our recent code security audit work. The main
9869 fix resolves a remote heap overflow vulnerability that can allow remote
9870 code execution. Other fixes address a variety of assert and crash bugs,
9871 most of which we think are hard to exploit remotely.
9873 o Major bugfixes (security):
9874 - Fix a heap overflow bug where an adversary could cause heap
9875 corruption. This bug probably allows remote code execution
9876 attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
9878 - Prevent a denial-of-service attack by disallowing any
9879 zlib-compressed data whose compression factor is implausibly
9880 high. Fixes part of bug 2324; reported by "doorss".
9881 - Zero out a few more keys in memory before freeing them. Fixes
9882 bug 2384 and part of bug 2385. These key instances found by
9883 "cypherpunks", based on Andrew Case's report about being able
9884 to find sensitive data in Tor's memory space if you have enough
9885 permissions. Bugfix on 0.0.2pre9.
9887 o Major bugfixes (crashes):
9888 - Prevent calls to Libevent from inside Libevent log handlers.
9889 This had potential to cause a nasty set of crashes, especially
9890 if running Libevent with debug logging enabled, and running
9891 Tor with a controller watching for low-severity log messages.
9892 Bugfix on 0.1.0.2-rc. Fixes bug 2190.
9893 - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
9894 underflow errors there too. Fixes the other part of bug 2324.
9895 - Fix a bug where we would assert if we ever had a
9896 cached-descriptors.new file (or another file read directly into
9897 memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
9898 on 0.2.1.25. Found by doorss.
9899 - Fix some potential asserts and parsing issues with grossly
9900 malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
9903 o Minor bugfixes (other):
9904 - Fix a bug with handling misformed replies to reverse DNS lookup
9905 requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
9906 bug reported by doorss.
9907 - Fix compilation on mingw when a pthreads compatibility library
9908 has been installed. (We don't want to use it, so we shouldn't
9909 be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
9910 - Fix a bug where we would declare that we had run out of virtual
9911 addresses when the address space was only half-exhausted. Bugfix
9913 - Correctly handle the case where AutomapHostsOnResolve is set but
9914 no virtual addresses are available. Fixes bug 2328; bugfix on
9915 0.1.2.1-alpha. Bug found by doorss.
9916 - Correctly handle wrapping around to when we run out of virtual
9917 address space. Found by cypherpunks, bugfix on 0.2.0.5-alpha.
9918 - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
9919 because we built it with a too-old version of automake. Thus that
9920 release broke ./configure --enable-openbsd-malloc, which is popular
9921 among really fast exit relays on Linux.
9924 - Update to the January 1 2011 Maxmind GeoLite Country database.
9925 - Introduce output size checks on all of our decryption functions.
9928 - Tor does not build packages correctly with Automake 1.6 and earlier;
9929 added a check to Makefile.am to make sure that we're building with
9930 Automake 1.7 or later.
9933 Changes in version 0.2.2.20-alpha - 2010-12-17
9934 Tor 0.2.2.20-alpha does some code cleanup to reduce the risk of remotely
9935 exploitable bugs. We also fix a variety of other significant bugs,
9936 change the IP address for one of our directory authorities, and update
9937 the minimum version that Tor relays must run to join the network.
9940 - Fix a remotely exploitable bug that could be used to crash instances
9941 of Tor remotely by overflowing on the heap. Remote-code execution
9942 hasn't been confirmed, but can't be ruled out. Everyone should
9943 upgrade. Bugfix on the 0.1.1 series and later.
9944 - Fix a bug that could break accounting on 64-bit systems with large
9945 time_t values, making them hibernate for impossibly long intervals.
9946 Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
9947 - Fix a logic error in directory_fetches_from_authorities() that
9948 would cause all _non_-exits refusing single-hop-like circuits
9949 to fetch from authorities, when we wanted to have _exits_ fetch
9950 from authorities. Fixes more of 2097. Bugfix on 0.2.2.16-alpha;
9952 - Fix a stream fairness bug that would cause newer streams on a given
9953 circuit to get preference when reading bytes from the origin or
9954 destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
9955 introduced before the first Tor release, in svn revision r152.
9957 o Directory authority changes:
9958 - Change IP address and ports for gabelmoo (v3 directory authority).
9961 - Avoid crashes when AccountingMax is set on clients. Fixes bug 2235.
9962 Bugfix on 0.2.2.18-alpha. Diagnosed by boboper.
9963 - Fix an off-by-one error in calculating some controller command
9964 argument lengths. Fortunately, this mistake is harmless since
9965 the controller code does redundant NUL termination too. Found by
9966 boboper. Bugfix on 0.1.1.1-alpha.
9967 - Do not dereference NULL if a bridge fails to build its
9968 extra-info descriptor. Found by an anonymous commenter on
9969 Trac. Bugfix on 0.2.2.19-alpha.
9972 - Update to the December 1 2010 Maxmind GeoLite Country database.
9973 - Directory authorities now reject relays running any versions of
9974 Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
9975 known bugs that keep RELAY_EARLY cells from working on rendezvous
9976 circuits. Followup to fix for bug 2081.
9977 - Directory authorities now reject relays running any version of Tor
9978 older than 0.2.0.26-rc. That version is the earliest that fetches
9979 current directory information correctly. Fixes bug 2156.
9980 - Report only the top 10 ports in exit-port stats in order not to
9981 exceed the maximum extra-info descriptor length of 50 KB. Implements
9985 Changes in version 0.2.1.28 - 2010-12-17
9986 Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
9987 exploitable bugs. We also took this opportunity to change the IP address
9988 for one of our directory authorities, and to update the geoip database
9992 - Fix a remotely exploitable bug that could be used to crash instances
9993 of Tor remotely by overflowing on the heap. Remote-code execution
9994 hasn't been confirmed, but can't be ruled out. Everyone should
9995 upgrade. Bugfix on the 0.1.1 series and later.
9997 o Directory authority changes:
9998 - Change IP address and ports for gabelmoo (v3 directory authority).
10001 - Update to the December 1 2010 Maxmind GeoLite Country database.
10004 Changes in version 0.2.1.27 - 2010-11-23
10005 Yet another OpenSSL security patch broke its compatibility with Tor:
10006 Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
10007 also took this opportunity to fix several crash bugs, integrate a new
10008 directory authority, and update the bundled GeoIP database.
10011 - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
10012 No longer set the tlsext_host_name extension on server SSL objects;
10013 but continue to set it on client SSL objects. Our goal in setting
10014 it was to imitate a browser, not a vhosting server. Fixes bug 2204;
10015 bugfix on 0.2.1.1-alpha.
10016 - Do not log messages to the controller while shrinking buffer
10017 freelists. Doing so would sometimes make the controller connection
10018 try to allocate a buffer chunk, which would mess up the internals
10019 of the freelist and cause an assertion failure. Fixes bug 1125;
10020 fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
10021 - Learn our external IP address when we're a relay or bridge, even if
10022 we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
10023 where we introduced bridge relays that don't need to publish to
10024 be useful. Fixes bug 2050.
10025 - Do even more to reject (and not just ignore) annotations on
10026 router descriptors received anywhere but from the cache. Previously
10027 we would ignore such annotations at first, but cache them to disk
10028 anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
10029 - When you're using bridges and your network goes away and your
10030 bridges get marked as down, recover when you attempt a new socks
10031 connection (if the network is back), rather than waiting up to an
10032 hour to try fetching new descriptors for your bridges. Bugfix on
10033 0.2.0.3-alpha; fixes bug 1981.
10036 - Move to the November 2010 Maxmind GeoLite country db (rather
10037 than the June 2009 ip-to-country GeoIP db) for our statistics that
10038 count how many users relays are seeing from each country. Now we'll
10039 have more accurate data, especially for many African countries.
10041 o New directory authorities:
10042 - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
10046 - Fix an assertion failure that could occur in directory caches or
10047 bridge users when using a very short voting interval on a testing
10048 network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
10050 - Enforce multiplicity rules when parsing annotations. Bugfix on
10051 0.2.0.8-alpha. Found by piebeer.
10052 - Allow handshaking OR connections to take a full KeepalivePeriod
10053 seconds to handshake. Previously, we would close them after
10054 IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
10055 were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
10057 - When building with --enable-gcc-warnings on OpenBSD, disable
10058 warnings in system headers. This makes --enable-gcc-warnings
10059 pass on OpenBSD 4.8.
10062 - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
10063 and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
10064 stream ending reason for this case: END_STREAM_REASON_NOROUTE.
10065 Servers can start sending this code when enough clients recognize
10066 it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
10067 - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
10068 Patch from mingw-san.
10071 - Remove the old debian/ directory from the main Tor distribution.
10072 The official Tor-for-debian git repository lives at the URL
10073 https://git.torproject.org/debian/tor.git
10074 - Stop shipping the old doc/website/ directory in the tarball. We
10075 changed the website format in late 2010, and what we shipped in
10076 0.2.1.26 really wasn't that useful anyway.
10079 Changes in version 0.2.2.19-alpha - 2010-11-22
10080 Yet another OpenSSL security patch broke its compatibility with Tor:
10081 Tor 0.2.2.19-alpha makes relays work with OpenSSL 0.9.8p and 1.0.0.b.
10084 - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
10085 No longer set the tlsext_host_name extension on server SSL objects;
10086 but continue to set it on client SSL objects. Our goal in setting
10087 it was to imitate a browser, not a vhosting server. Fixes bug 2204;
10088 bugfix on 0.2.1.1-alpha.
10091 - Try harder not to exceed the maximum length of 50 KB when writing
10092 statistics to extra-info descriptors. This bug was triggered by very
10093 fast relays reporting exit-port, entry, and dirreq statistics.
10094 Reported by Olaf Selke. Bugfix on 0.2.2.1-alpha. Fixes bug 2183.
10095 - Publish a router descriptor even if generating an extra-info
10096 descriptor fails. Previously we would not publish a router
10097 descriptor without an extra-info descriptor; this can cause fast
10098 exit relays collecting exit-port statistics to drop from the
10099 consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
10102 Changes in version 0.2.2.18-alpha - 2010-11-16
10103 Tor 0.2.2.18-alpha fixes several crash bugs that have been nagging
10104 us lately, makes unpublished bridge relays able to detect their IP
10105 address, and fixes a wide variety of other bugs to get us much closer
10106 to a stable release.
10109 - Do even more to reject (and not just ignore) annotations on
10110 router descriptors received anywhere but from the cache. Previously
10111 we would ignore such annotations at first, but cache them to disk
10112 anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
10113 - Do not log messages to the controller while shrinking buffer
10114 freelists. Doing so would sometimes make the controller connection
10115 try to allocate a buffer chunk, which would mess up the internals
10116 of the freelist and cause an assertion failure. Fixes bug 1125;
10117 fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
10118 - Learn our external IP address when we're a relay or bridge, even if
10119 we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
10120 where we introduced bridge relays that don't need to publish to
10121 be useful. Fixes bug 2050.
10122 - Maintain separate TLS contexts and certificates for incoming and
10123 outgoing connections in bridge relays. Previously we would use the
10124 same TLS contexts and certs for incoming and outgoing connections.
10125 Bugfix on 0.2.0.3-alpha; addresses bug 988.
10126 - Maintain separate identity keys for incoming and outgoing TLS
10127 contexts in bridge relays. Previously we would use the same
10128 identity keys for incoming and outgoing TLS contexts. Bugfix on
10129 0.2.0.3-alpha; addresses the other half of bug 988.
10130 - Avoid an assertion failure when we as an authority receive a
10131 duplicate upload of a router descriptor that we already have,
10132 but which we previously considered an obsolete descriptor.
10133 Fixes another case of bug 1776. Bugfix on 0.2.2.16-alpha.
10134 - Avoid a crash bug triggered by looking at a dangling pointer while
10135 setting the network status consensus. Found by Robert Ransom.
10136 Bugfix on 0.2.2.17-alpha. Fixes bug 2097.
10137 - Fix a logic error where servers that _didn't_ act as exits would
10138 try to keep their server lists more aggressively up to date than
10139 exits, when it was supposed to be the other way around. Bugfix
10142 o Minor bugfixes (on Tor 0.2.1.x and earlier):
10143 - When we're trying to guess whether we know our IP address as
10144 a relay, we would log various ways that we failed to guess
10145 our address, but never log that we ended up guessing it
10146 successfully. Now add a log line to help confused and anxious
10147 relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
10148 - Bring the logic that gathers routerinfos and assesses the
10149 acceptability of circuits into line. This prevents a Tor OP from
10150 getting locked in a cycle of choosing its local OR as an exit for a
10151 path (due to a .exit request) and then rejecting the circuit because
10152 its OR is not listed yet. It also prevents Tor clients from using an
10153 OR running in the same instance as an exit (due to a .exit request)
10154 if the OR does not meet the same requirements expected of an OR
10155 running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
10156 - Correctly describe errors that occur when generating a TLS object.
10157 Previously we would attribute them to a failure while generating a
10158 TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
10160 - Enforce multiplicity rules when parsing annotations. Bugfix on
10161 0.2.0.8-alpha. Found by piebeer.
10162 - Fix warnings that newer versions of autoconf produced during
10163 ./autogen.sh. These warnings appear to be harmless in our case,
10164 but they were extremely verbose. Fixes bug 2020.
10166 o Minor bugfixes (on Tor 0.2.2.x):
10167 - Enable protection of small arrays whenever we build with gcc
10168 hardening features, not only when also building with warnings
10169 enabled. Fixes bug 2031; bugfix on 0.2.2.14-alpha. Reported by keb.
10172 - Make hidden services work better in private Tor networks by not
10173 requiring any uptime to join the hidden service descriptor
10174 DHT. Implements ticket 2088.
10175 - Rate-limit the "your application is giving Tor only an IP address"
10176 warning. Addresses bug 2000; bugfix on 0.0.8pre2.
10177 - When AllowSingleHopExits is set, print a warning to explain to the
10178 relay operator why most clients are avoiding her relay.
10179 - Update to the November 1 2010 Maxmind GeoLite Country database.
10181 o Code simplifications and refactoring:
10182 - When we fixed bug 1038 we had to put in a restriction not to send
10183 RELAY_EARLY cells on rend circuits. This was necessary as long
10184 as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
10185 active. Now remove this obsolete check. Resolves bug 2081.
10186 - Some options used different conventions for uppercasing of acronyms
10187 when comparing manpage and source. Fix those in favor of the
10188 manpage, as it makes sense to capitalize acronyms.
10189 - Remove the torrc.complete file. It hasn't been kept up to date
10190 and users will have better luck checking out the manpage.
10191 - Remove the obsolete "NoPublish" option; it has been flagged
10192 as obsolete and has produced a warning since 0.1.1.18-rc.
10193 - Remove everything related to building the expert bundle for OS X.
10194 It has confused many users, doesn't work right on OS X 10.6,
10195 and is hard to get rid of once installed. Resolves bug 1274.
10198 Changes in version 0.2.2.17-alpha - 2010-09-30
10199 Tor 0.2.2.17-alpha introduces a feature to make it harder for clients
10200 to use one-hop circuits (which can put the exit relays at higher risk,
10201 plus unbalance the network); fixes a big bug in bandwidth accounting
10202 for relays that want to limit their monthly bandwidth use; fixes a
10203 big pile of bugs in how clients tolerate temporary network failure;
10204 and makes our adaptive circuit build timeout feature (which improves
10205 client performance if your network is fast while not breaking things
10206 if your network is slow) better handle bad networks.
10209 - Exit relays now try harder to block exit attempts from unknown
10210 relays, to make it harder for people to use them as one-hop proxies
10211 a la tortunnel. Controlled by the refuseunknownexits consensus
10212 parameter (currently enabled), or you can override it on your
10213 relay with the RefuseUnknownExits torrc option. Resolves bug 1751.
10215 o Major bugfixes (0.2.1.x and earlier):
10216 - Fix a bug in bandwidth accounting that could make us use twice
10217 the intended bandwidth when our interval start changes due to
10218 daylight saving time. Now we tolerate skew in stored vs computed
10219 interval starts: if the start of the period changes by no more than
10220 50% of the period's duration, we remember bytes that we transferred
10221 in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
10222 - Always search the Windows system directory for system DLLs, and
10223 nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
10224 - When you're using bridges and your network goes away and your
10225 bridges get marked as down, recover when you attempt a new socks
10226 connection (if the network is back), rather than waiting up to an
10227 hour to try fetching new descriptors for your bridges. Bugfix on
10228 0.2.0.3-alpha; fixes bug 1981.
10230 o Major bugfixes (on 0.2.2.x):
10231 - Fix compilation on Windows. Bugfix on 0.2.2.16-alpha; related to
10233 - Fix a segfault that could happen when operating a bridge relay with
10234 no GeoIP database set. Fixes bug 1964; bugfix on 0.2.2.15-alpha.
10235 - The consensus bandwidth-weights (used by clients to choose fast
10236 relays) entered an unexpected edge case in September where
10237 Exits were much scarcer than Guards, resulting in bad weight
10238 recommendations. Now we compute them using new constraints that
10239 should succeed in all cases. Also alter directory authorities to
10240 not include the bandwidth-weights line if they fail to produce
10241 valid values. Fixes bug 1952; bugfix on 0.2.2.10-alpha.
10242 - When weighting bridges during path selection, we used to trust
10243 the bandwidths they provided in their descriptor, only capping them
10244 at 10MB/s. This turned out to be problematic for two reasons:
10245 Bridges could claim to handle a lot more traffic then they
10246 actually would, thus making more clients pick them and have a
10247 pretty effective DoS attack. The other issue is that new bridges
10248 that might not have a good estimate for their bw capacity yet
10249 would not get used at all unless no other bridges are available
10250 to a client. Fixes bug 1912; bugfix on 0.2.2.7-alpha.
10252 o Major bugfixes (on the circuit build timeout feature, 0.2.2.x):
10253 - Ignore cannibalized circuits when recording circuit build times.
10254 This should provide for a minor performance improvement for hidden
10255 service users using 0.2.2.14-alpha, and should remove two spurious
10256 notice log messages. Bugfix on 0.2.2.14-alpha; fixes bug 1740.
10257 - Simplify the logic that causes us to decide if the network is
10258 unavailable for purposes of recording circuit build times. If we
10259 receive no cells whatsoever for the entire duration of a circuit's
10260 full measured lifetime, the network is probably down. Also ignore
10261 one-hop directory fetching circuit timeouts when calculating our
10262 circuit build times. These changes should hopefully reduce the
10263 cases where we see ridiculous circuit build timeouts for people
10264 with spotty wireless connections. Fixes part of bug 1772; bugfix
10266 - Prevent the circuit build timeout from becoming larger than
10267 the maximum build time we have ever seen. Also, prevent the time
10268 period for measurement circuits from becoming larger than twice that
10269 value. Fixes the other part of bug 1772; bugfix on 0.2.2.2-alpha.
10272 - When we run out of directory information such that we can't build
10273 circuits, but then get enough that we can build circuits, log when
10274 we actually construct a circuit, so the user has a better chance of
10275 knowing what's going on. Fixes bug 1362.
10276 - Be more generous with how much bandwidth we'd use up (with
10277 accounting enabled) before entering "soft hibernation". Previously,
10278 we'd refuse new connections and circuits once we'd used up 95% of
10279 our allotment. Now, we use up 95% of our allotment, AND make sure
10280 that we have no more than 500MB (or 3 hours of expected traffic,
10281 whichever is lower) remaining before we enter soft hibernation.
10282 - If we've configured EntryNodes and our network goes away and/or all
10283 our entrynodes get marked down, optimistically retry them all when
10284 a new socks application request appears. Fixes bug 1882.
10285 - Add some more defensive programming for architectures that can't
10286 handle unaligned integer accesses. We don't know of any actual bugs
10287 right now, but that's the best time to fix them. Fixes bug 1943.
10288 - Support line continuations in the torrc config file. If a line
10289 ends with a single backslash character, the newline is ignored, and
10290 the configuration value is treated as continuing on the next line.
10293 o Minor bugfixes (on 0.2.1.x and earlier):
10294 - For bandwidth accounting, calculate our expected bandwidth rate
10295 based on the time during which we were active and not in
10296 soft-hibernation during the last interval. Previously, we were
10297 also considering the time spent in soft-hibernation. If this
10298 was a long time, we would wind up underestimating our bandwidth
10299 by a lot, and skewing our wakeup time towards the start of the
10300 accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
10302 o Minor bugfixes (on 0.2.2.x):
10303 - Resume generating CIRC FAILED REASON=TIMEOUT control port messages,
10304 which were disabled by the circuit build timeout changes in
10305 0.2.2.14-alpha. Bugfix on 0.2.2.14-alpha; fixes bug 1739.
10306 - Make sure we don't warn about missing bandwidth weights when
10307 choosing bridges or other relays not in the consensus. Bugfix on
10308 0.2.2.10-alpha; fixes bug 1805.
10309 - In our logs, do not double-report signatures from unrecognized
10310 authorities both as "from unknown authority" and "not
10311 present". Fixes bug 1956, bugfix on 0.2.2.16-alpha.
10314 Changes in version 0.2.2.16-alpha - 2010-09-17
10315 Tor 0.2.2.16-alpha fixes a variety of old stream fairness bugs (most
10316 evident at exit relays), and also continues to resolve all the little
10317 bugs that have been filling up trac lately.
10319 o Major bugfixes (stream-level fairness):
10320 - When receiving a circuit-level SENDME for a blocked circuit, try
10321 to package cells fairly from all the streams that had previously
10322 been blocked on that circuit. Previously, we had started with the
10323 oldest stream, and allowed each stream to potentially exhaust
10324 the circuit's package window. This gave older streams on any
10325 given circuit priority over newer ones. Fixes bug 1937. Detected
10326 originally by Camilo Viecco. This bug was introduced before the
10327 first Tor release, in svn commit r152: it is the new winner of
10328 the longest-lived bug prize.
10329 - When the exit relay got a circuit-level sendme cell, it started
10330 reading on the exit streams, even if had 500 cells queued in the
10331 circuit queue already, so the circuit queue just grew and grew in
10332 some cases. We fix this by not re-enabling reading on receipt of a
10333 sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
10334 on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
10336 - Newly created streams were allowed to read cells onto circuits,
10337 even if the circuit's cell queue was blocked and waiting to drain.
10338 This created potential unfairness, as older streams would be
10339 blocked, but newer streams would gladly fill the queue completely.
10340 We add code to detect this situation and prevent any stream from
10341 getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
10345 - Update to the September 1 2010 Maxmind GeoLite Country database.
10346 - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
10347 not. This would lead to a cookie that is still not group readable.
10348 Closes bug 1843. Suggested by katmagic.
10349 - When logging a rate-limited warning, we now mention how many messages
10350 got suppressed since the last warning.
10351 - Add new "perconnbwrate" and "perconnbwburst" consensus params to
10352 do individual connection-level rate limiting of clients. The torrc
10353 config options with the same names trump the consensus params, if
10354 both are present. Replaces the old "bwconnrate" and "bwconnburst"
10355 consensus params which were broken from 0.2.2.7-alpha through
10356 0.2.2.14-alpha. Closes bug 1947.
10357 - When a router changes IP address or port, authorities now launch
10358 a new reachability test for it. Implements ticket 1899.
10359 - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
10360 2 no signature, 4 required" messages about consensus signatures
10361 easier to read, and make sure they get logged at the same severity
10362 as the messages explaining which keys are which. Fixes bug 1290.
10363 - Don't warn when we have a consensus that we can't verify because
10364 of missing certificates, unless those certificates are ones
10365 that we have been trying and failing to download. Fixes bug 1145.
10366 - If you configure your bridge with a known identity fingerprint,
10367 and the bridge authority is unreachable (as it is in at least
10368 one country now), fall back to directly requesting the descriptor
10369 from the bridge. Finishes the feature started in 0.2.0.10-alpha;
10371 - When building with --enable-gcc-warnings on OpenBSD, disable
10372 warnings in system headers. This makes --enable-gcc-warnings
10373 pass on OpenBSD 4.8.
10375 o Minor bugfixes (on 0.2.1.x and earlier):
10376 - Authorities will now attempt to download consensuses if their
10377 own efforts to make a live consensus have failed. This change
10378 means authorities that restart will fetch a valid consensus, and
10379 it means authorities that didn't agree with the current consensus
10380 will still fetch and serve it if it has enough signatures. Bugfix
10381 on 0.2.0.9-alpha; fixes bug 1300.
10382 - Ensure DNS requests launched by "RESOLVE" commands from the
10383 controller respect the __LeaveStreamsUnattached setconf options. The
10384 same goes for requests launched via DNSPort or transparent
10385 proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
10386 - Allow handshaking OR connections to take a full KeepalivePeriod
10387 seconds to handshake. Previously, we would close them after
10388 IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
10389 were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
10391 - Rate-limit "Failed to hand off onionskin" warnings.
10392 - Never relay a cell for a circuit we have already destroyed.
10393 Between marking a circuit as closeable and finally closing it,
10394 it may have been possible for a few queued cells to get relayed,
10395 even though they would have been immediately dropped by the next
10396 OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
10397 - Never queue a cell for a circuit that's already been marked
10399 - Never vote for a server as "Running" if we have a descriptor for
10400 it claiming to be hibernating, and that descriptor was published
10401 more recently than our last contact with the server. Bugfix on
10402 0.2.0.3-alpha; fixes bug 911.
10403 - Squash a compile warning on OpenBSD. Reported by Tas; fixes
10406 o Minor bugfixes (on 0.2.2.x):
10407 - Fix a regression introduced in 0.2.2.7-alpha that marked relays
10408 down if a directory fetch fails and you've configured either
10409 bridges or EntryNodes. The intent was to mark the relay as down
10410 _unless_ you're using bridges or EntryNodes, since if you are
10411 then you could quickly run out of entry points.
10412 - Fix the Windows directory-listing code. A bug introduced in
10413 0.2.2.14-alpha could make Windows directory servers forget to load
10414 some of their cached v2 networkstatus files.
10415 - Really allow clients to use relays as bridges. Fixes bug 1776;
10416 bugfix on 0.2.2.15-alpha.
10417 - Demote a warn to info that happens when the CellStatistics option
10418 was just enabled. Bugfix on 0.2.2.15-alpha; fixes bug 1921.
10419 Reported by Moritz Bartl.
10420 - On Windows, build correctly either with or without Unicode support.
10421 This is necessary so that Tor can support fringe platforms like
10422 Windows 98 (which has no Unicode), or Windows CE (which has no
10423 non-Unicode). Bugfix on 0.2.2.14-alpha; fixes bug 1797.
10426 - Add a unit test for cross-platform directory-listing code.
10429 Changes in version 0.2.2.15-alpha - 2010-08-18
10430 Tor 0.2.2.15-alpha fixes a big bug in hidden service availability,
10431 fixes a variety of other bugs that were preventing performance
10432 experiments from moving forward, fixes several bothersome memory leaks,
10433 and generally closes a lot of smaller bugs that have been filling up
10437 - Stop assigning the HSDir flag to relays that disable their
10438 DirPort (and thus will refuse to answer directory requests). This
10439 fix should dramatically improve the reachability of hidden services:
10440 hidden services and hidden service clients pick six HSDir relays
10441 to store and retrieve the hidden service descriptor, and currently
10442 about half of the HSDir relays will refuse to work. Bugfix on
10443 0.2.0.10-alpha; fixes part of bug 1693.
10444 - The PerConnBWRate and Burst config options, along with the
10445 bwconnrate and bwconnburst consensus params, initialized each conn's
10446 token bucket values only when the connection is established. Now we
10447 update them if the config options change, and update them every time
10448 we get a new consensus. Otherwise we can encounter an ugly edge
10449 case where we initialize an OR conn to client-level bandwidth,
10450 but then later the relay joins the consensus and we leave it
10451 throttled. Bugfix on 0.2.2.7-alpha; fixes bug 1830.
10452 - Fix a regression that caused Tor to rebind its ports if it receives
10453 SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
10456 - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
10457 should give us approximately 40-50% more Guard-flagged nodes,
10458 improving the anonymity the Tor network can provide and also
10459 decreasing the dropoff in throughput that relays experience when
10460 they first get the Guard flag.
10461 - Allow enabling or disabling the *Statistics config options while
10465 - Update to the August 1 2010 Maxmind GeoLite Country database.
10466 - Have the controller interface give a more useful message than
10467 "Internal Error" in response to failed GETINFO requests.
10468 - Warn when the same option is provided more than once in a torrc
10469 file, on the command line, or in a single SETCONF statement, and
10470 the option is one that only accepts a single line. Closes bug 1384.
10471 - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
10472 Patch from mingw-san.
10473 - Add support for the country code "{??}" in torrc options like
10474 ExcludeNodes, to indicate all routers of unknown country. Closes
10476 - Relays report the number of bytes spent on answering directory
10477 requests in extra-info descriptors similar to {read,write}-history.
10478 Implements enhancement 1790.
10480 o Minor bugfixes (on 0.2.1.x and earlier):
10481 - Complain if PublishServerDescriptor is given multiple arguments that
10482 include 0 or 1. This configuration will be rejected in the future.
10483 Bugfix on 0.2.0.1-alpha; closes bug 1107.
10484 - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
10485 Bugfix on 0.2.0.13-alpha; closes bug 928.
10486 - Change "Application request when we're believed to be offline."
10487 notice to "Application request when we haven't used client
10488 functionality lately.", to clarify that it's not an error. Bugfix
10489 on 0.0.9.3; fixes bug 1222.
10490 - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
10491 would return "551 Internal error" rather than "552 Unrecognized key
10492 ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
10493 - Users can't configure a regular relay to be their bridge. It didn't
10494 work because when Tor fetched the bridge descriptor, it found
10495 that it already had it, and didn't realize that the purpose of the
10496 descriptor had changed. Now we replace routers with a purpose other
10497 than bridge with bridge descriptors when fetching them. Bugfix on
10498 0.1.1.9-alpha. Bug 1776 not yet fixed because now we immediately
10499 refetch the descriptor with router purpose 'general', disabling
10501 - Fix a rare bug in rend_fn unit tests: we would fail a test when
10502 a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
10503 on 0.2.0.10-alpha; fixes bug 1808.
10504 - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
10505 and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
10506 stream ending reason for this case: END_STREAM_REASON_NOROUTE.
10507 Servers can start sending this code when enough clients recognize
10508 it. Also update the spec to reflect this new reason. Bugfix on
10509 0.1.0.1-rc; fixes part of bug 1793.
10510 - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
10511 when we switch from being a public relay to a bridge. Otherwise
10512 there will still be clients that see the relay in their consensus,
10513 and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes bug
10515 - Instead of giving an assertion failure on an internal mismatch
10516 on estimated freelist size, just log a BUG warning and try later.
10517 Mitigates but does not fix bug 1125.
10518 - Fix an assertion failure that could occur in caches or bridge users
10519 when using a very short voting interval on a testing network.
10520 Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on 0.2.0.8-alpha.
10522 o Minor bugfixes (on 0.2.2.x):
10523 - Alter directory authorities to always consider Exit-flagged nodes
10524 as potential Guard nodes in their votes. The actual decision to
10525 use Exits as Guards is done in the consensus bandwidth weights.
10526 Fixes bug 1294; bugfix on 0.2.2.10-alpha.
10527 - When the controller is reporting the purpose of circuits that
10528 didn't finish building before the circuit build timeout, it was
10529 printing UNKNOWN_13. Now print EXPIRED. Bugfix on 0.2.2.14-alpha.
10530 - Our libevent version parsing code couldn't handle versions like
10531 1.4.14b-stable and incorrectly warned the user about using an
10532 old and broken version of libevent. Treat 1.4.14b-stable like
10533 1.4.14-stable when parsing the version. Fixes bug 1731; bugfix
10535 - Don't use substitution references like $(VAR:MOD) when
10536 $(asciidoc_files) is empty -- make(1) on NetBSD transforms
10537 '$(:x)' to 'x' rather than the empty string. This bites us in
10538 doc/ when configured with --disable-asciidoc. Bugfix on
10539 0.2.2.9-alpha; fixes bug 1773.
10540 - Remove a spurious hidden service server-side log notice about
10541 "Ancient non-dirty circuits". Bugfix on 0.2.2.14-alpha; fixes
10543 - Fix compilation with --with-dmalloc set. Bugfix on 0.2.2.6-alpha;
10545 - Correctly report written bytes on linked connections. Found while
10546 implementing 1790. Bugfix on 0.2.2.4-alpha.
10547 - Fix three memory leaks: one in circuit_build_times_parse_state(),
10548 one in dirvote_add_signatures_to_pending_consensus(), and one every
10549 time we parse a v3 network consensus. Bugfixes on 0.2.2.14-alpha,
10550 0.2.2.6-alpha, and 0.2.2.10-alpha respectively; fixes bug 1831.
10552 o Code simplifications and refactoring:
10553 - Take a first step towards making or.h smaller by splitting out
10554 function definitions for all source files in src/or/. Leave
10555 structures and defines in or.h for now.
10556 - Remove a bunch of unused function declarations as well as a block of
10557 #if 0'd code from the unit tests. Closes bug 1824.
10558 - New unit tests for exit-port history statistics; refactored exit
10559 statistics code to be more easily tested.
10560 - Remove the old debian/ directory from the main Tor distribution.
10561 The official Tor-for-debian git repository lives at the URL
10562 https://git.torproject.org/debian/tor.git
10565 Changes in version 0.2.2.14-alpha - 2010-07-12
10566 Tor 0.2.2.14-alpha greatly improves client-side handling of
10567 circuit build timeouts, which are used to estimate speed and improve
10568 performance. We also move to a much better GeoIP database, port Tor to
10569 Windows CE, introduce new compile flags that improve code security,
10570 add an eighth v3 directory authority, and address a lot of more
10574 - Tor directory authorities no longer crash when started with a
10575 cached-microdesc-consensus file in their data directory. Bugfix
10576 on 0.2.2.6-alpha; fixes bug 1532.
10577 - Treat an unset $HOME like an empty $HOME rather than triggering an
10578 assert. Bugfix on 0.0.8pre1; fixes bug 1522.
10579 - Ignore negative and large circuit build timeout values that can
10580 happen during a suspend or hibernate. These values caused various
10581 asserts to fire. Bugfix on 0.2.2.2-alpha; fixes bug 1245.
10582 - Alter calculation of Pareto distribution parameter 'Xm' for
10583 Circuit Build Timeout learning to use the weighted average of the
10584 top N=3 modes (because we have three entry guards). Considering
10585 multiple modes should improve the timeout calculation in some cases,
10586 and prevent extremely high timeout values. Bugfix on 0.2.2.2-alpha;
10588 - Alter calculation of Pareto distribution parameter 'Alpha' to use a
10589 right censored distribution model. This approach improves over the
10590 synthetic timeout generation approach that was producing insanely
10591 high timeout values. Now we calculate build timeouts using truncated
10592 times. Bugfix on 0.2.2.2-alpha; fixes bugs 1245 and 1335.
10593 - Do not close circuits that are under construction when they reach
10594 the circuit build timeout. Instead, leave them building (but do not
10595 use them) for up until the time corresponding to the 95th percentile
10596 on the Pareto CDF or 60 seconds, whichever is greater. This is done
10597 to provide better data for the new Pareto model. This percentile
10598 can be controlled by the consensus.
10601 - Move to the June 2010 Maxmind GeoLite country db (rather than the
10602 June 2009 ip-to-country GeoIP db) for our statistics that count
10603 how many users relays are seeing from each country. Now we have
10604 more accurate data for many African countries.
10605 - Port Tor to build and run correctly on Windows CE systems, using
10606 the wcecompat library. Contributed by Valerio Lupi.
10607 - New "--enable-gcc-hardening" ./configure flag (off by default)
10608 to turn on gcc compile time hardening options. It ensures
10609 that signed ints have defined behavior (-fwrapv), enables
10610 -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
10611 with canaries (-fstack-protector-all), turns on ASLR protection if
10612 supported by the kernel (-fPIE, -pie), and adds additional security
10613 related warnings. Verified to work on Mac OS X and Debian Lenny.
10614 - New "--enable-linker-hardening" ./configure flag (off by default)
10615 to turn on ELF specific hardening features (relro, now). This does
10616 not work with Mac OS X or any other non-ELF binary format.
10618 o New directory authorities:
10619 - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
10623 - New config option "WarnUnsafeSocks 0" disables the warning that
10624 occurs whenever Tor receives a socks handshake using a version of
10625 the socks protocol that can only provide an IP address (rather
10626 than a hostname). Setups that do DNS locally over Tor are fine,
10627 and we shouldn't spam the logs in that case.
10628 - Convert the HACKING file to asciidoc, and add a few new sections
10629 to it, explaining how we use Git, how we make changelogs, and
10630 what should go in a patch.
10631 - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
10632 event, to give information on the current rate of circuit timeouts
10633 over our stored history.
10634 - Add ability to disable circuit build time learning via consensus
10635 parameter and via a LearnCircuitBuildTimeout config option. Also
10636 automatically disable circuit build time calculation if we are
10637 either a AuthoritativeDirectory, or if we fail to write our state
10638 file. Fixes bug 1296.
10639 - More gracefully handle corrupt state files, removing asserts
10640 in favor of saving a backup and resetting state.
10641 - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
10645 - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
10647 - When a2x fails, mention that the user could disable manpages instead
10648 of trying to fix their asciidoc installation.
10649 - Where available, use Libevent 2.0's periodic timers so that our
10650 once-per-second cleanup code gets called even more closely to
10651 once per second than it would otherwise. Fixes bug 943.
10652 - If you run a bridge that listens on multiple IP addresses, and
10653 some user configures a bridge address that uses a different IP
10654 address than your bridge writes in its router descriptor, and the
10655 user doesn't specify an identity key, their Tor would discard the
10656 descriptor because "it isn't one of our configured bridges", and
10657 fail to bootstrap. Now believe the descriptor and bootstrap anyway.
10658 Bugfix on 0.2.0.3-alpha.
10659 - If OpenSSL fails to make a duplicate of a private or public key, log
10660 an error message and try to exit cleanly. May help with debugging
10661 if bug 1209 ever remanifests.
10662 - Save a couple bytes in memory allocation every time we escape
10663 certain characters in a string. Patch from Florian Zumbiehl.
10664 - Make it explicit that we don't cannibalize one-hop circuits. This
10665 happens in the wild, but doesn't turn out to be a problem because
10666 we fortunately don't use those circuits. Many thanks to outofwords
10667 for the initial analysis and to swissknife who confirmed that
10668 two-hop circuits are actually created.
10669 - Make directory mirrors report non-zero dirreq-v[23]-shares again.
10670 Fixes bug 1564; bugfix on 0.2.2.9-alpha.
10671 - Eliminate a case where a circuit build time warning was displayed
10672 after network connectivity resumed. Bugfix on 0.2.2.2-alpha.
10675 Changes in version 0.2.1.26 - 2010-05-02
10676 Tor 0.2.1.26 addresses the recent connection and memory overload
10677 problems we've been seeing on relays, especially relays with their
10678 DirPort open. If your relay has been crashing, or you turned it off
10679 because it used too many resources, give this release a try.
10681 This release also fixes yet another instance of broken OpenSSL libraries
10682 that was causing some relays to drop out of the consensus.
10685 - Teach relays to defend themselves from connection overload. Relays
10686 now close idle circuits early if it looks like they were intended
10687 for directory fetches. Relays are also more aggressive about closing
10688 TLS connections that have no circuits on them. Such circuits are
10689 unlikely to be re-used, and tens of thousands of them were piling
10690 up at the fast relays, causing the relays to run out of sockets
10691 and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
10692 their directory fetches over TLS).
10693 - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
10694 that claim to be earlier than 0.9.8m, but which have in reality
10695 backported huge swaths of 0.9.8m or 0.9.8n renegotiation
10696 behavior. Possible fix for some cases of bug 1346.
10697 - Directory mirrors were fetching relay descriptors only from v2
10698 directory authorities, rather than v3 authorities like they should.
10699 Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
10700 to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
10703 - Finally get rid of the deprecated and now harmful notion of "clique
10704 mode", where directory authorities maintain TLS connections to
10708 - In the util/threads test, no longer free the test_mutex before all
10709 worker threads have finished. Bugfix on 0.2.1.6-alpha.
10710 - The master thread could starve the worker threads quite badly on
10711 certain systems, causing them to run only partially in the allowed
10712 window. This resulted in test failures. Now the master thread sleeps
10713 occasionally for a few microseconds while the two worker-threads
10714 compete for the mutex. Bugfix on 0.2.0.1-alpha.
10717 Changes in version 0.2.2.13-alpha - 2010-04-24
10718 Tor 0.2.2.13-alpha addresses the recent connection and memory overload
10719 problems we've been seeing on relays, especially relays with their
10720 DirPort open. If your relay has been crashing, or you turned it off
10721 because it used too many resources, give this release a try.
10724 - Teach relays to defend themselves from connection overload. Relays
10725 now close idle circuits early if it looks like they were intended
10726 for directory fetches. Relays are also more aggressive about closing
10727 TLS connections that have no circuits on them. Such circuits are
10728 unlikely to be re-used, and tens of thousands of them were piling
10729 up at the fast relays, causing the relays to run out of sockets
10730 and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
10731 their directory fetches over TLS).
10734 - Finally get rid of the deprecated and now harmful notion of "clique
10735 mode", where directory authorities maintain TLS connections to
10737 - Directory authorities now do an immediate reachability check as soon
10738 as they hear about a new relay. This change should slightly reduce
10739 the time between setting up a relay and getting listed as running
10740 in the consensus. It should also improve the time between setting
10741 up a bridge and seeing use by bridge users.
10742 - Directory authorities no longer launch a TLS connection to every
10743 relay as they startup. Now that we have 2k+ descriptors cached,
10744 the resulting network hiccup is becoming a burden. Besides,
10745 authorities already avoid voting about Running for the first half
10746 hour of their uptime.
10749 Changes in version 0.2.2.12-alpha - 2010-04-20
10750 Tor 0.2.2.12-alpha fixes a critical bug in how directory authorities
10751 handle and vote on descriptors. It was causing relays to drop out of
10755 - Many relays have been falling out of the consensus lately because
10756 not enough authorities know about their descriptor for them to get
10757 a majority of votes. When we deprecated the v2 directory protocol,
10758 we got rid of the only way that v3 authorities can hear from each
10759 other about other descriptors. Now authorities examine every v3
10760 vote for new descriptors, and fetch them from that authority. Bugfix
10762 - Fix two typos in tor_vasprintf() that broke the compile on Windows,
10763 and a warning in or.h related to bandwidth_weight_rule_t that
10764 prevented clean compile on OS X. Fixes bug 1363; bugfix on
10766 - Fix a segfault on relays when DirReqStatistics is enabled
10767 and 24 hours pass. Bug found by keb. Fixes bug 1365; bugfix on
10771 - Demote a confusing TLS warning that relay operators might get when
10772 someone tries to talk to their OrPort. It is neither the operator's
10773 fault nor can they do anything about it. Fixes bug 1364; bugfix
10777 Changes in version 0.2.2.11-alpha - 2010-04-15
10778 Tor 0.2.2.11-alpha fixes yet another instance of broken OpenSSL
10779 libraries that was causing some relays to drop out of the consensus.
10782 - Directory mirrors were fetching relay descriptors only from v2
10783 directory authorities, rather than v3 authorities like they should.
10784 Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
10785 to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
10786 - Fix a parsing error that made every possible value of
10787 CircPriorityHalflifeMsec get treated as "1 msec". Bugfix
10788 on 0.2.2.7-alpha. Rename CircPriorityHalflifeMsec to
10789 CircuitPriorityHalflifeMsec, so authorities can tell newer relays
10790 about the option without breaking older ones.
10791 - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
10792 that claim to be earlier than 0.9.8m, but which have in reality
10793 backported huge swaths of 0.9.8m or 0.9.8n renegotiation
10794 behavior. Possible fix for some cases of bug 1346.
10797 - Experiment with a more aggressive approach to preventing clients
10798 from making one-hop exit streams. Exit relays who want to try it
10799 out can set "RefuseUnknownExits 1" in their torrc, and then look
10800 for "Attempt by %s to open a stream" log messages. Let us know
10802 - Add support for statically linking zlib by specifying
10803 --enable-static-zlib, to go with our support for statically linking
10804 openssl and libevent. Resolves bug 1358.
10807 - Fix a segfault that happens whenever a Tor client that is using
10808 libevent2's bufferevents gets a hup signal. Bugfix on 0.2.2.5-alpha;
10810 - When we cleaned up the contrib/tor-exit-notice.html file, we left
10811 out the first line. Fixes bug 1295.
10812 - When building the manpage from a tarball, we required asciidoc, but
10813 the asciidoc -> roff/html conversion was already done for the
10814 tarball. Make 'make' complain only when we need asciidoc (either
10815 because we're compiling directly from git, or because we altered
10816 the asciidoc manpage in the tarball). Bugfix on 0.2.2.9-alpha.
10817 - When none of the directory authorities vote on any params, Tor
10818 segfaulted when trying to make the consensus from the votes. We
10819 didn't trigger the bug in practice, because authorities do include
10820 params in their votes. Bugfix on 0.2.2.10-alpha; fixes bug 1322.
10823 - In the util/threads test, no longer free the test_mutex before all
10824 worker threads have finished. Bugfix on 0.2.1.6-alpha.
10825 - The master thread could starve the worker threads quite badly on
10826 certain systems, causing them to run only partially in the allowed
10827 window. This resulted in test failures. Now the master thread sleeps
10828 occasionally for a few microseconds while the two worker-threads
10829 compete for the mutex. Bugfix on 0.2.0.1-alpha.
10832 Changes in version 0.2.2.10-alpha - 2010-03-07
10833 Tor 0.2.2.10-alpha fixes a regression introduced in 0.2.2.9-alpha that
10834 could prevent relays from guessing their IP address correctly. It also
10835 starts the groundwork for another client-side performance boost, since
10836 currently we're not making efficient use of relays that have both the
10837 Guard flag and the Exit flag.
10840 - Fix a regression from our patch for bug 1244 that caused relays
10841 to guess their IP address incorrectly if they didn't set Address
10842 in their torrc and/or their address fails to resolve. Bugfix on
10843 0.2.2.9-alpha; fixes bug 1269.
10845 o Major features (performance):
10846 - Directory authorities now compute consensus weightings that instruct
10847 clients how to weight relays flagged as Guard, Exit, Guard+Exit,
10848 and no flag. Clients that use these weightings will distribute
10849 network load more evenly across these different relay types. The
10850 weightings are in the consensus so we can change them globally in
10851 the future. Extra thanks to "outofwords" for finding some nasty
10852 security bugs in the first implementation of this feature.
10854 o Minor features (performance):
10855 - Always perform router selections using weighted relay bandwidth,
10856 even if we don't need a high capacity circuit at the time. Non-fast
10857 circuits now only differ from fast ones in that they can use relays
10858 not marked with the Fast flag. This "feature" could turn out to
10859 be a horrible bug; we should investigate more before it goes into
10863 - Allow disabling building of the manpages. Skipping the manpage
10864 speeds up the build considerably.
10866 o Minor bugfixes (on 0.2.2.x):
10867 - Fix a memleak in the EXTENDCIRCUIT logic. Spotted by coverity.
10868 Bugfix on 0.2.2.9-alpha.
10869 - Disallow values larger than INT32_MAX for PerConnBWRate|Burst
10870 config option. Bugfix on 0.2.2.7-alpha.
10871 - Ship the asciidoc-helper file in the tarball, so that people can
10872 build from source if they want to, and touching the .1.txt files
10873 doesn't break the build. Bugfix on 0.2.2.9-alpha.
10875 o Minor bugfixes (on 0.2.1.x or earlier):
10876 - Fix a dereference-then-NULL-check sequence when publishing
10877 descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
10879 - Fix another dereference-then-NULL-check sequence. Bugfix on
10880 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
10881 - Make sure we treat potentially not NUL-terminated strings correctly.
10882 Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
10884 o Code simplifications and refactoring:
10885 - Fix some urls in the exit notice file and make it XHTML1.1 strict
10886 compliant. Based on a patch from Christian Kujau.
10887 - Don't use sed in asciidoc-helper anymore.
10888 - Make the build process fail if asciidoc cannot be found and
10889 building with asciidoc isn't disabled.
10892 Changes in version 0.2.2.9-alpha - 2010-02-22
10893 Tor 0.2.2.9-alpha makes Tor work again on the latest OS X, updates the
10894 location of a directory authority, and cleans up a bunch of small bugs.
10896 o Directory authority changes:
10897 - Change IP address for dannenberg (v3 directory authority), and
10898 remove moria2 (obsolete v1, v2 directory authority and v0 hidden
10899 service directory authority) from the list.
10902 - Make Tor work again on the latest OS X: when deciding whether to
10903 use strange flags to turn TLS renegotiation on, detect the OpenSSL
10904 version at run-time, not compile time. We need to do this because
10905 Apple doesn't update its dev-tools headers when it updates its
10906 libraries in a security patch.
10907 - Fix a potential buffer overflow in lookup_last_hid_serv_request()
10908 that could happen on 32-bit platforms with 64-bit time_t. Also fix
10909 a memory leak when requesting a hidden service descriptor we've
10910 requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
10912 - Authorities could be tricked into giving out the Exit flag to relays
10913 that didn't allow exiting to any ports. This bug could screw
10914 with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
10915 1238. Bug discovered by Martin Kowalczyk.
10916 - When freeing a session key, zero it out completely. We only zeroed
10917 the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
10918 patched by ekir. Fixes bug 1254.
10921 - Fix static compilation by listing the openssl libraries in the right
10922 order. Bugfix on Tor 0.2.2.8-alpha; fixes bug 1237.
10923 - Resume handling .exit hostnames in a special way: originally we
10924 stripped the .exit part and used the requested exit relay. In
10925 0.2.2.1-alpha we stopped treating them in any special way, meaning
10926 if you use a .exit address then Tor will pass it on to the exit
10927 relay. Now we reject the .exit stream outright, since that behavior
10928 might be more expected by the user. Found and diagnosed by Scott
10929 Bennett and Downie on or-talk.
10930 - Don't spam the controller with events when we have no file
10931 descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
10932 for log messages was already solved from bug 748.)
10933 - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
10935 - Make the DNSPort option work with libevent 2.x. Don't alter the
10936 behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
10937 - Emit a GUARD DROPPED controller event for a case we missed.
10938 - Make more fields in the controller protocol case-insensitive, since
10939 control-spec.txt said they were.
10940 - Refactor resolve_my_address() to not use gethostbyname() anymore.
10941 Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
10942 - Fix a spec conformance issue: the network-status-version token
10943 must be the first token in a v3 consensus or vote. Discovered by
10944 parakeep. Bugfix on 0.2.0.3-alpha.
10946 o Code simplifications and refactoring:
10947 - Generate our manpage and HTML documentation using Asciidoc. This
10948 change should make it easier to maintain the documentation, and
10949 produce nicer HTML.
10950 - Remove the --enable-iphone option. According to reports from Marco
10951 Bonetti, Tor builds fine without any special tweaking on recent
10952 iPhone SDK versions.
10953 - Removed some unnecessary files from the source distribution. The
10954 AUTHORS file has now been merged into the people page on the
10955 website. The roadmaps and design doc can now be found in the
10956 projects directory in svn.
10957 - Enabled various circuit build timeout constants to be controlled
10958 by consensus parameters. Also set better defaults for these
10959 parameters based on experimentation on broadband and simulated
10960 high latency links.
10963 - The 'EXTENDCIRCUIT' control port command can now be used with
10964 a circ id of 0 and no path. This feature will cause Tor to build
10965 a new 'fast' general purpose circuit using its own path selection
10967 - Added a BUILDTIMEOUT_SET controller event to describe changes
10968 to the circuit build timeout.
10969 - Future-proof the controller protocol a bit by ignoring keyword
10970 arguments we do not recognize.
10971 - Expand homedirs passed to tor-checkkey. This should silence a
10972 coverity complaint about passing a user-supplied string into
10973 open() without checking it.
10976 Changes in version 0.2.1.25 - 2010-03-16
10977 Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
10978 prevent relays from guessing their IP address correctly. It also fixes
10979 several minor potential security bugs.
10982 - Fix a regression from our patch for bug 1244 that caused relays
10983 to guess their IP address incorrectly if they didn't set Address
10984 in their torrc and/or their address fails to resolve. Bugfix on
10985 0.2.1.23; fixes bug 1269.
10986 - When freeing a session key, zero it out completely. We only zeroed
10987 the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
10988 patched by ekir. Fixes bug 1254.
10991 - Fix a dereference-then-NULL-check sequence when publishing
10992 descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
10994 - Fix another dereference-then-NULL-check sequence. Bugfix on
10995 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
10996 - Make sure we treat potentially not NUL-terminated strings correctly.
10997 Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
11001 Changes in version 0.2.1.24 - 2010-02-21
11002 Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
11006 - Work correctly out-of-the-box with even more vendor-patched versions
11007 of OpenSSL. In particular, make it so Debian and OS X don't need
11008 customized patches to run/build.
11011 Changes in version 0.2.1.23 - 2010-02-13
11012 Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
11013 again on the latest OS X, and updates the location of a directory
11016 o Major bugfixes (performance):
11017 - We were selecting our guards uniformly at random, and then weighting
11018 which of our guards we'd use uniformly at random. This imbalance
11019 meant that Tor clients were severely limited on throughput (and
11020 probably latency too) by the first hop in their circuit. Now we
11021 select guards weighted by currently advertised bandwidth. We also
11022 automatically discard guards picked using the old algorithm. Fixes
11023 bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
11026 - Make Tor work again on the latest OS X: when deciding whether to
11027 use strange flags to turn TLS renegotiation on, detect the OpenSSL
11028 version at run-time, not compile time. We need to do this because
11029 Apple doesn't update its dev-tools headers when it updates its
11030 libraries in a security patch.
11031 - Fix a potential buffer overflow in lookup_last_hid_serv_request()
11032 that could happen on 32-bit platforms with 64-bit time_t. Also fix
11033 a memory leak when requesting a hidden service descriptor we've
11034 requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
11037 o Directory authority changes:
11038 - Change IP address for dannenberg (v3 directory authority), and
11039 remove moria2 (obsolete v1, v2 directory authority and v0 hidden
11040 service directory authority) from the list.
11043 - Refactor resolve_my_address() to not use gethostbyname() anymore.
11044 Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
11047 - Avoid a mad rush at the beginning of each month when each client
11048 rotates half of its guards. Instead we spread the rotation out
11049 throughout the month, but we still avoid leaving a precise timestamp
11050 in the state file about when we first picked the guard. Improves
11051 over the behavior introduced in 0.1.2.17.
11054 Changes in version 0.2.2.8-alpha - 2010-01-26
11055 Tor 0.2.2.8-alpha fixes a crash bug in 0.2.2.7-alpha that has been
11056 causing bridge relays to disappear. If you're running a bridge,
11060 - Fix a memory corruption bug on bridges that occured during the
11061 inclusion of stats data in extra-info descriptors. Also fix the
11062 interface for geoip_get_bridge_stats* to prevent similar bugs in
11063 the future. Diagnosis by Tas, patch by Karsten and Sebastian.
11064 Fixes bug 1208; bugfix on 0.2.2.7-alpha.
11067 - Ignore OutboundBindAddress when connecting to localhost.
11068 Connections to localhost need to come _from_ localhost, or else
11069 local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
11073 Changes in version 0.2.2.7-alpha - 2010-01-19
11074 Tor 0.2.2.7-alpha fixes a huge client-side performance bug, as well
11075 as laying the groundwork for further relay-side performance fixes. It
11076 also starts cleaning up client behavior with respect to the EntryNodes,
11077 ExitNodes, and StrictNodes config options.
11079 This release also rotates two directory authority keys, due to a
11080 security breach of some of the Torproject servers.
11082 o Directory authority changes:
11083 - Rotate keys (both v3 identity and relay identity) for moria1
11086 o Major features (performance):
11087 - We were selecting our guards uniformly at random, and then weighting
11088 which of our guards we'd use uniformly at random. This imbalance
11089 meant that Tor clients were severely limited on throughput (and
11090 probably latency too) by the first hop in their circuit. Now we
11091 select guards weighted by currently advertised bandwidth. We also
11092 automatically discard guards picked using the old algorithm. Fixes
11093 bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
11094 - When choosing which cells to relay first, relays can now favor
11095 circuits that have been quiet recently, to provide lower latency
11096 for low-volume circuits. By default, relays enable or disable this
11097 feature based on a setting in the consensus. You can override
11098 this default by using the new "CircuitPriorityHalflife" config
11099 option. Design and code by Ian Goldberg, Can Tang, and Chris
11101 - Add separate per-conn write limiting to go with the per-conn read
11102 limiting. We added a global write limit in Tor 0.1.2.5-alpha,
11103 but never per-conn write limits.
11104 - New consensus params "bwconnrate" and "bwconnburst" to let us
11105 rate-limit client connections as they enter the network. It's
11106 controlled in the consensus so we can turn it on and off for
11107 experiments. It's starting out off. Based on proposal 163.
11109 o Major features (relay selection options):
11110 - Switch to a StrictNodes config option, rather than the previous
11111 "StrictEntryNodes" / "StrictExitNodes" separation that was missing a
11112 "StrictExcludeNodes" option.
11113 - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
11114 change during a config reload, mark and discard all our origin
11115 circuits. This fix should address edge cases where we change the
11116 config options and but then choose a circuit that we created before
11118 - If EntryNodes or ExitNodes are set, be more willing to use an
11119 unsuitable (e.g. slow or unstable) circuit. The user asked for it,
11121 - Make EntryNodes config option much more aggressive even when
11122 StrictNodes is not set. Before it would prepend your requested
11123 entrynodes to your list of guard nodes, but feel free to use others
11124 after that. Now it chooses only from your EntryNodes if any of
11125 those are available, and only falls back to others if a) they're
11126 all down and b) StrictNodes is not set.
11127 - Now we refresh your entry guards from EntryNodes at each consensus
11128 fetch -- rather than just at startup and then they slowly rot as
11129 the network changes.
11132 - Stop bridge directory authorities from answering dbg-stability.txt
11133 directory queries, which would let people fetch a list of all
11134 bridge identities they track. Bugfix on 0.2.1.6-alpha.
11137 - Log a notice when we get a new control connection. Now it's easier
11138 for security-conscious users to recognize when a local application
11139 is knocking on their controller door. Suggested by bug 1196.
11140 - New config option "CircuitStreamTimeout" to override our internal
11141 timeout schedule for how many seconds until we detach a stream from
11142 a circuit and try a new circuit. If your network is particularly
11143 slow, you might want to set this to a number like 60.
11144 - New controller command "getinfo config-text". It returns the
11145 contents that Tor would write if you send it a SAVECONF command,
11146 so the controller can write the file to disk itself.
11147 - New options for SafeLogging to allow scrubbing only log messages
11148 generated while acting as a relay.
11149 - Ship the bridges spec file in the tarball too.
11150 - Avoid a mad rush at the beginning of each month when each client
11151 rotates half of its guards. Instead we spread the rotation out
11152 throughout the month, but we still avoid leaving a precise timestamp
11153 in the state file about when we first picked the guard. Improves
11154 over the behavior introduced in 0.1.2.17.
11156 o Minor bugfixes (compiling):
11157 - Fix compilation on OS X 10.3, which has a stub mlockall() but
11158 hides it. Bugfix on 0.2.2.6-alpha.
11159 - Fix compilation on Solaris by removing support for the
11160 DisableAllSwap config option. Solaris doesn't have an rlimit for
11161 mlockall, so we cannot use it safely. Fixes bug 1198; bugfix on
11164 o Minor bugfixes (crashes):
11165 - Do not segfault when writing buffer stats when we haven't observed
11166 a single circuit to report about. Found by Fabian Lanze. Bugfix on
11168 - If we're in the pathological case where there's no exit bandwidth
11169 but there is non-exit bandwidth, or no guard bandwidth but there
11170 is non-guard bandwidth, don't crash during path selection. Bugfix
11172 - Fix an impossible-to-actually-trigger buffer overflow in relay
11173 descriptor generation. Bugfix on 0.1.0.15.
11175 o Minor bugfixes (privacy):
11176 - Fix an instance where a Tor directory mirror might accidentally
11177 log the IP address of a misbehaving Tor client. Bugfix on
11179 - Don't list Windows capabilities in relay descriptors. We never made
11180 use of them, and maybe it's a bad idea to publish them. Bugfix
11183 o Minor bugfixes (other):
11184 - Resolve an edge case in path weighting that could make us misweight
11185 our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
11186 - Fix statistics on client numbers by country as seen by bridges that
11187 were broken in 0.2.2.1-alpha. Also switch to reporting full 24-hour
11188 intervals instead of variable 12-to-48-hour intervals.
11189 - After we free an internal connection structure, overwrite it
11190 with a different memory value than we use for overwriting a freed
11191 internal circuit structure. Should help with debugging. Suggested
11193 - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
11196 o Removed features:
11197 - Remove the HSAuthorityRecordStats option that version 0 hidden
11198 service authorities could have used to track statistics of overall
11199 hidden service usage.
11202 Changes in version 0.2.1.22 - 2010-01-19
11203 Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
11204 authorities -- it would tell you its whole history of bridge descriptors
11205 if you make the right directory request. This stable update also
11206 rotates two of the seven v3 directory authority keys and locations.
11208 o Directory authority changes:
11209 - Rotate keys (both v3 identity and relay identity) for moria1
11213 - Stop bridge directory authorities from answering dbg-stability.txt
11214 directory queries, which would let people fetch a list of all
11215 bridge identities they track. Bugfix on 0.2.1.6-alpha.
11218 Changes in version 0.2.1.21 - 2009-12-21
11219 Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
11220 library. If you use Tor on Linux / Unix and you're getting SSL
11221 renegotiation errors, upgrading should help. We also recommend an
11222 upgrade if you're an exit relay.
11225 - Work around a security feature in OpenSSL 0.9.8l that prevents our
11226 handshake from working unless we explicitly tell OpenSSL that we
11227 are using SSL renegotiation safely. We are, of course, but OpenSSL
11228 0.9.8l won't work unless we say we are.
11229 - Avoid crashing if the client is trying to upload many bytes and the
11230 circuit gets torn down at the same time, or if the flip side
11231 happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
11234 - Do not refuse to learn about authority certs and v2 networkstatus
11235 documents that are older than the latest consensus. This bug might
11236 have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
11237 Spotted and fixed by xmux.
11238 - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
11239 trigger platform-specific option misparsing case found by Coverity
11241 - Fix a compilation warning on Fedora 12 by removing an impossible-to-
11242 trigger assert. Fixes bug 1173.
11245 Changes in version 0.2.2.6-alpha - 2009-11-19
11246 Tor 0.2.2.6-alpha lays the groundwork for many upcoming features:
11247 support for the new lower-footprint "microdescriptor" directory design,
11248 future-proofing our consensus format against new hash functions or
11249 other changes, and an Android port. It also makes Tor compatible with
11250 the upcoming OpenSSL 0.9.8l release, and fixes a variety of bugs.
11253 - Directory authorities can now create, vote on, and serve multiple
11254 parallel formats of directory data as part of their voting process.
11255 Partially implements Proposal 162: "Publish the consensus in
11257 - Directory authorities can now agree on and publish small summaries
11258 of router information that clients can use in place of regular
11259 server descriptors. This transition will eventually allow clients
11260 to use far less bandwidth for downloading information about the
11261 network. Begins the implementation of Proposal 158: "Clients
11262 download consensus + microdescriptors".
11263 - The directory voting system is now extensible to use multiple hash
11264 algorithms for signatures and resource selection. Newer formats
11265 are signed with SHA256, with a possibility for moving to a better
11266 hash algorithm in the future.
11267 - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
11268 current and future memory pages via mlockall(). On supported
11269 platforms (modern Linux and probably BSD but not Windows or OS X),
11270 this should effectively disable any and all attempts to page out
11271 memory. This option requires that you start your Tor as root --
11272 if you use DisableAllSwap, please consider using the User option
11273 to properly reduce the privileges of your Tor.
11274 - Numerous changes, bugfixes, and workarounds from Nathan Freitas
11275 to help Tor build correctly for Android phones.
11278 - Work around a security feature in OpenSSL 0.9.8l that prevents our
11279 handshake from working unless we explicitly tell OpenSSL that we
11280 are using SSL renegotiation safely. We are, but OpenSSL 0.9.8l
11281 won't work unless we say we are.
11284 - Fix a crash bug when trying to initialize the evdns module in
11285 Libevent 2. Bugfix on 0.2.1.16-rc.
11286 - Stop logging at severity 'warn' when some other Tor client tries
11287 to establish a circuit with us using weak DH keys. It's a protocol
11288 violation, but that doesn't mean ordinary users need to hear about
11289 it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
11290 - Do not refuse to learn about authority certs and v2 networkstatus
11291 documents that are older than the latest consensus. This bug might
11292 have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
11293 Spotted and fixed by xmux.
11294 - Fix numerous small code-flaws found by Coverity Scan Rung 3.
11295 - If all authorities restart at once right before a consensus vote,
11296 nobody will vote about "Running", and clients will get a consensus
11297 with no usable relays. Instead, authorities refuse to build a
11298 consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
11299 - If your relay can't keep up with the number of incoming create
11300 cells, it would log one warning per failure into your logs. Limit
11301 warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
11302 - Bridges now use "reject *:*" as their default exit policy. Bugfix
11303 on 0.2.0.3-alpha; fixes bug 1113.
11304 - Fix a memory leak on directory authorities during voting that was
11305 introduced in 0.2.2.1-alpha. Found via valgrind.
11308 Changes in version 0.2.1.20 - 2009-10-15
11309 Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
11310 services at once, prepares for more performance improvements, and
11311 fixes a bunch of smaller bugs.
11313 The Windows and OS X bundles also include a more recent Vidalia,
11314 and switch from Privoxy to Polipo.
11316 The OS X installers are now drag and drop. It's best to un-install
11317 Tor/Vidalia and then install this new bundle, rather than upgrade. If
11318 you want to upgrade, you'll need to update the paths for Tor and Polipo
11319 in the Vidalia Settings window.
11322 - Send circuit or stream sendme cells when our window has decreased
11323 by 100 cells, not when it has decreased by 101 cells. Bug uncovered
11324 by Karsten when testing the "reduce circuit window" performance
11325 patch. Bugfix on the 54th commit on Tor -- from July 2002,
11326 before the release of Tor 0.0.0. This is the new winner of the
11328 - Fix a remotely triggerable memory leak when a consensus document
11329 contains more than one signature from the same voter. Bugfix on
11331 - Avoid segfault in rare cases when finishing an introduction circuit
11332 as a client and finding out that we don't have an introduction key
11333 for it. Fixes bug 1073. Reported by Aaron Swartz.
11336 - Tor now reads the "circwindow" parameter out of the consensus,
11337 and uses that value for its circuit package window rather than the
11338 default of 1000 cells. Begins the implementation of proposal 168.
11340 o New directory authorities:
11341 - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
11343 - Move moria1 and tonga to alternate IP addresses.
11346 - Fix a signed/unsigned compile warning in 0.2.1.19.
11347 - Fix possible segmentation fault on directory authorities. Bugfix on
11349 - Fix an extremely rare infinite recursion bug that could occur if
11350 we tried to log a message after shutting down the log subsystem.
11351 Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
11352 - Fix an obscure bug where hidden services on 64-bit big-endian
11353 systems might mis-read the timestamp in v3 introduce cells, and
11354 refuse to connect back to the client. Discovered by "rotor".
11355 Bugfix on 0.2.1.6-alpha.
11356 - We were triggering a CLOCK_SKEW controller status event whenever
11357 we connect via the v2 connection protocol to any relay that has
11358 a wrong clock. Instead, we should only inform the controller when
11359 it's a trusted authority that claims our clock is wrong. Bugfix
11360 on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
11361 - We were telling the controller about CHECKING_REACHABILITY and
11362 REACHABILITY_FAILED status events whenever we launch a testing
11363 circuit or notice that one has failed. Instead, only tell the
11364 controller when we want to inform the user of overall success or
11365 overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
11367 - Don't warn when we're using a circuit that ends with a node
11368 excluded in ExcludeExitNodes, but the circuit is not used to access
11369 the outside world. This should help fix bug 1090. Bugfix on
11371 - Work around a small memory leak in some versions of OpenSSL that
11372 stopped the memory used by the hostname TLS extension from being
11376 - Add a "getinfo status/accepted-server-descriptor" controller
11377 command, which is the recommended way for controllers to learn
11378 whether our server descriptor has been successfully received by at
11379 least on directory authority. Un-recommend good-server-descriptor
11380 getinfo and status events until we have a better design for them.
11383 Changes in version 0.2.2.5-alpha - 2009-10-11
11384 Tor 0.2.2.5-alpha fixes a few compile problems in 0.2.2.4-alpha.
11387 - Make the tarball compile again. Oops. Bugfix on 0.2.2.4-alpha.
11389 o Directory authorities:
11390 - Temporarily (just for this release) move dizum to an alternate
11394 Changes in version 0.2.2.4-alpha - 2009-10-10
11395 Tor 0.2.2.4-alpha fixes more crash bugs in 0.2.2.2-alpha. It also
11396 introduces a new unit test framework, shifts directry authority
11397 addresses around to reduce the impact from recent blocking events,
11398 and fixes a few smaller bugs.
11401 - Fix several more asserts in the circuit_build_times code, for
11402 example one that causes Tor to fail to start once we have
11403 accumulated 5000 build times in the state file. Bugfixes on
11404 0.2.2.2-alpha; fixes bug 1108.
11406 o New directory authorities:
11407 - Move moria1 and Tonga to alternate IP addresses.
11410 - Log SSL state transitions at debug level during handshake, and
11411 include SSL states in error messages. This may help debug future
11412 SSL handshake issues.
11413 - Add a new "Handshake" log domain for activities that happen
11414 during the TLS handshake.
11415 - Revert to the "June 3 2009" ip-to-country file. The September one
11416 seems to have removed most US IP addresses.
11417 - Directory authorities now reject Tor relays with versions less than
11418 0.1.2.14. This step cuts out four relays from the current network,
11419 none of which are very big.
11422 - Fix a couple of smaller issues with gathering statistics. Bugfixes
11424 - Fix two memory leaks in the error case of
11425 circuit_build_times_parse_state(). Bugfix on 0.2.2.2-alpha.
11426 - Don't count one-hop circuits when we're estimating how long it
11427 takes circuits to build on average. Otherwise we'll set our circuit
11428 build timeout lower than we should. Bugfix on 0.2.2.2-alpha.
11429 - Directory authorities no longer change their opinion of, or vote on,
11430 whether a router is Running, unless they have themselves been
11431 online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
11434 o Code simplifications and refactoring:
11435 - Revise our unit tests to use the "tinytest" framework, so we
11436 can run tests in their own processes, have smarter setup/teardown
11437 code, and so on. The unit test code has moved to its own
11438 subdirectory, and has been split into multiple modules.
11441 Changes in version 0.2.2.3-alpha - 2009-09-23
11442 Tor 0.2.2.3-alpha fixes a few crash bugs in 0.2.2.2-alpha.
11445 - Fix an overzealous assert in our new circuit build timeout code.
11446 Bugfix on 0.2.2.2-alpha; fixes bug 1103.
11449 - If the networkstatus consensus tells us that we should use a
11450 negative circuit package window, ignore it. Otherwise we'll
11451 believe it and then trigger an assert. Bugfix on 0.2.2.2-alpha.
11454 Changes in version 0.2.2.2-alpha - 2009-09-21
11455 Tor 0.2.2.2-alpha introduces our latest performance improvement for
11456 clients: Tor tracks the average time it takes to build a circuit, and
11457 avoids using circuits that take too long to build. For fast connections,
11458 this feature can cut your expected latency in half. For slow or flaky
11459 connections, it could ruin your Tor experience. Let us know if it does!
11462 - Tor now tracks how long it takes to build client-side circuits
11463 over time, and adapts its timeout to local network performance.
11464 Since a circuit that takes a long time to build will also provide
11465 bad performance, we get significant latency improvements by
11466 discarding the slowest 20% of circuits. Specifically, Tor creates
11467 circuits more aggressively than usual until it has enough data
11468 points for a good timeout estimate. Implements proposal 151.
11469 We are especially looking for reports (good and bad) from users with
11470 both EDGE and broadband connections that can move from broadband
11471 to EDGE and find out if the build-time data in the .tor/state gets
11472 reset without loss of Tor usability. You should also see a notice
11473 log message telling you that Tor has reset its timeout.
11474 - Directory authorities can now vote on arbitary integer values as
11475 part of the consensus process. This is designed to help set
11476 network-wide parameters. Implements proposal 167.
11477 - Tor now reads the "circwindow" parameter out of the consensus,
11478 and uses that value for its circuit package window rather than the
11479 default of 1000 cells. Begins the implementation of proposal 168.
11482 - Fix a remotely triggerable memory leak when a consensus document
11483 contains more than one signature from the same voter. Bugfix on
11487 - Fix an extremely rare infinite recursion bug that could occur if
11488 we tried to log a message after shutting down the log subsystem.
11489 Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
11490 - Fix parsing for memory or time units given without a space between
11491 the number and the unit. Bugfix on 0.2.2.1-alpha; fixes bug 1076.
11492 - A networkstatus vote must contain exactly one signature. Spec
11493 conformance issue. Bugfix on 0.2.0.3-alpha.
11494 - Fix an obscure bug where hidden services on 64-bit big-endian
11495 systems might mis-read the timestamp in v3 introduce cells, and
11496 refuse to connect back to the client. Discovered by "rotor".
11497 Bugfix on 0.2.1.6-alpha.
11498 - We were triggering a CLOCK_SKEW controller status event whenever
11499 we connect via the v2 connection protocol to any relay that has
11500 a wrong clock. Instead, we should only inform the controller when
11501 it's a trusted authority that claims our clock is wrong. Bugfix
11502 on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
11503 - We were telling the controller about CHECKING_REACHABILITY and
11504 REACHABILITY_FAILED status events whenever we launch a testing
11505 circuit or notice that one has failed. Instead, only tell the
11506 controller when we want to inform the user of overall success or
11507 overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
11509 - Don't warn when we're using a circuit that ends with a node
11510 excluded in ExcludeExitNodes, but the circuit is not used to access
11511 the outside world. This should help fix bug 1090, but more problems
11512 remain. Bugfix on 0.2.1.6-alpha.
11513 - Work around a small memory leak in some versions of OpenSSL that
11514 stopped the memory used by the hostname TLS extension from being
11516 - Make our 'torify' script more portable; if we have only one of
11517 'torsocks' or 'tsocks' installed, don't complain to the user;
11518 and explain our warning about tsocks better.
11521 - Add a "getinfo status/accepted-server-descriptor" controller
11522 command, which is the recommended way for controllers to learn
11523 whether our server descriptor has been successfully received by at
11524 least on directory authority. Un-recommend good-server-descriptor
11525 getinfo and status events until we have a better design for them.
11526 - Update to the "September 4 2009" ip-to-country file.
11529 Changes in version 0.2.2.1-alpha - 2009-08-26
11530 Tor 0.2.2.1-alpha disables ".exit" address notation by default, allows
11531 Tor clients to bootstrap on networks where only port 80 is reachable,
11532 makes it more straightforward to support hardware crypto accelerators,
11533 and starts the groundwork for gathering stats safely at relays.
11536 - Start the process of disabling ".exit" address notation, since it
11537 can be used for a variety of esoteric application-level attacks
11538 on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
11541 o New directory authorities:
11542 - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
11546 - New AccelName and AccelDir options add support for dynamic OpenSSL
11547 hardware crypto acceleration engines.
11548 - Tor now supports tunneling all of its outgoing connections over
11549 a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
11550 configuration options. Code by Christopher Davis.
11553 - Send circuit or stream sendme cells when our window has decreased
11554 by 100 cells, not when it has decreased by 101 cells. Bug uncovered
11555 by Karsten when testing the "reduce circuit window" performance
11556 patch. Bugfix on the 54th commit on Tor -- from July 2002,
11557 before the release of Tor 0.0.0. This is the new winner of the
11560 o New options for gathering stats safely:
11561 - Directory mirrors that set "DirReqStatistics 1" write statistics
11562 about directory requests to disk every 24 hours. As compared to the
11563 --enable-geoip-stats flag in 0.2.1.x, there are a few improvements:
11564 1) stats are written to disk exactly every 24 hours; 2) estimated
11565 shares of v2 and v3 requests are determined as mean values, not at
11566 the end of a measurement period; 3) unresolved requests are listed
11567 with country code '??'; 4) directories also measure download times.
11568 - Exit nodes that set "ExitPortStatistics 1" write statistics on the
11569 number of exit streams and transferred bytes per port to disk every
11571 - Relays that set "CellStatistics 1" write statistics on how long
11572 cells spend in their circuit queues to disk every 24 hours.
11573 - Entry nodes that set "EntryStatistics 1" write statistics on the
11574 rough number and origins of connecting clients to disk every 24
11576 - Relays that write any of the above statistics to disk and set
11577 "ExtraInfoStatistics 1" include the past 24 hours of statistics in
11578 their extra-info documents.
11581 - New --digests command-line switch to output the digests of the
11582 source files Tor was built with.
11583 - The "torify" script now uses torsocks where available.
11584 - The memarea code now uses a sentinel value at the end of each area
11585 to make sure nothing writes beyond the end of an area. This might
11586 help debug some conceivable causes of bug 930.
11587 - Time and memory units in the configuration file can now be set to
11588 fractional units. For example, "2.5 GB" is now a valid value for
11590 - Certain Tor clients (such as those behind check.torproject.org) may
11591 want to fetch the consensus in an extra early manner. To enable this
11592 a user may now set FetchDirInfoExtraEarly to 1. This also depends on
11593 setting FetchDirInfoEarly to 1. Previous behavior will stay the same
11594 as only certain clients who must have this information sooner should
11596 - Instead of adding the svn revision to the Tor version string, report
11597 the git commit (when we're building from a git checkout).
11600 - If any of the v3 certs we download are unparseable, we should
11601 actually notice the failure so we don't retry indefinitely. Bugfix
11602 on 0.2.0.x; reported by "rotator".
11603 - If the cached cert file is unparseable, warn but don't exit.
11604 - Fix possible segmentation fault on directory authorities. Bugfix on
11606 - When Tor fails to parse a descriptor of any kind, dump it to disk.
11607 Might help diagnosing bug 1051.
11609 o Deprecated and removed features:
11610 - The controller no longer accepts the old obsolete "addr-mappings/"
11611 or "unregistered-servers-" GETINFO values.
11612 - Hidden services no longer publish version 0 descriptors, and clients
11613 do not request or use version 0 descriptors. However, the old hidden
11614 service authorities still accept and serve version 0 descriptors
11615 when contacted by older hidden services/clients.
11616 - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
11617 always on; using them is necessary for correct forward-compatible
11619 - Remove support for .noconnect style addresses. Nobody was using
11620 them, and they provided another avenue for detecting Tor users
11621 via application-level web tricks.
11623 o Packaging changes:
11624 - Upgrade Vidalia from 0.1.15 to 0.2.3 in the Windows and OS X
11625 installer bundles. See
11626 https://trac.vidalia-project.net/browser/vidalia/tags/vidalia-0.2.3/CHANGELOG
11627 for details of what's new in Vidalia 0.2.3.
11628 - Windows Vidalia Bundle: update Privoxy from 3.0.6 to 3.0.14-beta.
11629 - OS X Vidalia Bundle: move to Polipo 1.0.4 with Tor specific
11630 configuration file, rather than the old Privoxy.
11631 - OS X Vidalia Bundle: Vidalia, Tor, and Polipo are compiled as
11632 x86-only for better compatibility with OS X 10.6, aka Snow Leopard.
11633 - OS X Tor Expert Bundle: Tor is compiled as x86-only for
11634 better compatibility with OS X 10.6, aka Snow Leopard.
11635 - OS X Vidalia Bundle: The multi-package installer is now replaced
11636 by a simple drag and drop to the /Applications folder. This change
11637 occurred with the upgrade to Vidalia 0.2.3.
11640 Changes in version 0.2.1.19 - 2009-07-28
11641 Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
11642 services on Tor 0.2.1.3-alpha through 0.2.1.18.
11645 - Make accessing hidden services on 0.2.1.x work right again.
11646 Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
11647 part of patch provided by "optimist".
11650 - When a relay/bridge is writing out its identity key fingerprint to
11651 the "fingerprint" file and to its logs, write it without spaces. Now
11652 it will look like the fingerprints in our bridges documentation,
11653 and confuse fewer users.
11656 - Relays no longer publish a new server descriptor if they change
11657 their MaxAdvertisedBandwidth config option but it doesn't end up
11658 changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
11659 fixes bug 1026. Patch from Sebastian.
11660 - Avoid leaking memory every time we get a create cell but we have
11661 so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
11662 fixes bug 1034. Reported by BarkerJr.
11665 Changes in version 0.2.1.18 - 2009-07-24
11666 Tor 0.2.1.18 lays the foundations for performance improvements,
11667 adds status events to help users diagnose bootstrap problems, adds
11668 optional authentication/authorization for hidden services, fixes a
11669 variety of potential anonymity problems, and includes a huge pile of
11670 other features and bug fixes.
11673 - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
11676 Changes in version 0.2.1.17-rc - 2009-07-07
11677 Tor 0.2.1.17-rc marks the fourth -- and hopefully last -- release
11678 candidate for the 0.2.1.x series. It lays the groundwork for further
11679 client performance improvements, and also fixes a big bug with directory
11680 authorities that were causing them to assign Guard and Stable flags
11683 The Windows bundles also finally include the geoip database that we
11684 thought we'd been shipping since 0.2.0.x (oops), and the OS X bundles
11685 should actually install Torbutton rather than giving you a cryptic
11686 failure message (oops).
11689 - Clients now use the bandwidth values in the consensus, rather than
11690 the bandwidth values in each relay descriptor. This approach opens
11691 the door to more accurate bandwidth estimates once the directory
11692 authorities start doing active measurements. Implements more of
11696 - When Tor clients restart after 1-5 days, they discard all their
11697 cached descriptors as too old, but they still use the cached
11698 consensus document. This approach is good for robustness, but
11699 bad for performance: since they don't know any bandwidths, they
11700 end up choosing at random rather than weighting their choice by
11701 speed. Fixed by the above feature of putting bandwidths in the
11702 consensus. Bugfix on 0.2.0.x.
11703 - Directory authorities were neglecting to mark relays down in their
11704 internal histories if the relays fall off the routerlist without
11705 ever being found unreachable. So there were relays in the histories
11706 that haven't been seen for eight months, and are listed as being
11707 up for eight months. This wreaked havoc on the "median wfu"
11708 and "median mtbf" calculations, in turn making Guard and Stable
11709 flags very wrong, hurting network performance. Fixes bugs 696 and
11710 969. Bugfix on 0.2.0.6-alpha.
11713 - Serve the DirPortFrontPage page even when we have been approaching
11714 our quotas recently. Fixes bug 1013; bugfix on 0.2.1.8-alpha.
11715 - The control port would close the connection before flushing long
11716 replies, such as the network consensus, if a QUIT command was issued
11717 before the reply had completed. Now, the control port flushes all
11718 pending replies before closing the connection. Also fixed a spurious
11719 warning when a QUIT command is issued after a malformed or rejected
11720 AUTHENTICATE command, but before the connection was closed. Patch
11721 by Marcus Griep. Bugfix on 0.2.0.x; fixes bugs 1015 and 1016.
11722 - When we can't find an intro key for a v2 hidden service descriptor,
11723 fall back to the v0 hidden service descriptor and log a bug message.
11724 Workaround for bug 1024.
11725 - Fix a log message that did not respect the SafeLogging option.
11729 - If we're a relay and we change our IP address, be more verbose
11730 about the reason that made us change. Should help track down
11731 further bugs for relays on dynamic IP addresses.
11734 Changes in version 0.2.0.35 - 2009-06-24
11736 - Avoid crashing in the presence of certain malformed descriptors.
11737 Found by lark, and by automated fuzzing.
11738 - Fix an edge case where a malicious exit relay could convince a
11739 controller that the client's DNS question resolves to an internal IP
11740 address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
11743 - Finally fix the bug where dynamic-IP relays disappear when their
11744 IP address changes: directory mirrors were mistakenly telling
11745 them their old address if they asked via begin_dir, so they
11746 never got an accurate answer about their new address, so they
11747 just vanished after a day. For belt-and-suspenders, relays that
11748 don't set Address in their config now avoid using begin_dir for
11749 all direct connections. Should fix bugs 827, 883, and 900.
11750 - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
11751 that would occur on some exit nodes when DNS failures and timeouts
11752 occurred in certain patterns. Fix for bug 957.
11755 - When starting with a cache over a few days old, do not leak
11756 memory for the obsolete router descriptors in it. Bugfix on
11757 0.2.0.33; fixes bug 672.
11758 - Hidden service clients didn't use a cached service descriptor that
11759 was older than 15 minutes, but wouldn't fetch a new one either,
11760 because there was already one in the cache. Now, fetch a v2
11761 descriptor unless the same descriptor was added to the cache within
11762 the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
11765 Changes in version 0.2.1.16-rc - 2009-06-20
11766 Tor 0.2.1.16-rc speeds up performance for fast exit relays, and fixes
11767 a bunch of minor bugs.
11770 - Fix an edge case where a malicious exit relay could convince a
11771 controller that the client's DNS question resolves to an internal IP
11772 address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
11774 o Major performance improvements (on 0.2.0.x):
11775 - Disable and refactor some debugging checks that forced a linear scan
11776 over the whole server-side DNS cache. These accounted for over 50%
11777 of CPU time on a relatively busy exit node's gprof profile. Found
11779 - Disable some debugging checks that appeared in exit node profile
11783 - Update to the "June 3 2009" ip-to-country file.
11784 - Do not have tor-resolve automatically refuse all .onion addresses;
11785 if AutomapHostsOnResolve is set in your torrc, this will work fine.
11787 o Minor bugfixes (on 0.2.0.x):
11788 - Log correct error messages for DNS-related network errors on
11790 - Fix a race condition that could cause crashes or memory corruption
11791 when running as a server with a controller listening for log
11793 - Avoid crashing when we have a policy specified in a DirPolicy or
11794 SocksPolicy or ReachableAddresses option with ports set on it,
11795 and we re-load the policy. May fix bug 996.
11796 - Hidden service clients didn't use a cached service descriptor that
11797 was older than 15 minutes, but wouldn't fetch a new one either,
11798 because there was already one in the cache. Now, fetch a v2
11799 descriptor unless the same descriptor was added to the cache within
11800 the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
11802 o Minor bugfixes (on 0.2.1.x):
11803 - Don't warn users about low port and hibernation mix when they
11804 provide a *ListenAddress directive to fix that. Bugfix on
11806 - When switching back and forth between bridge mode, do not start
11807 gathering GeoIP data until two hours have passed.
11808 - Do not complain that the user has requested an excluded node as
11809 an exit when the node is not really an exit. This could happen
11810 because the circuit was for testing, or an introduction point.
11814 Changes in version 0.2.1.15-rc - 2009-05-25
11815 Tor 0.2.1.15-rc marks the second release candidate for the 0.2.1.x
11816 series. It fixes a major bug on fast exit relays, as well as a variety
11817 of more minor bugs.
11819 o Major bugfixes (on 0.2.0.x):
11820 - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
11821 that would occur on some exit nodes when DNS failures and timeouts
11822 occurred in certain patterns. Fix for bug 957.
11824 o Minor bugfixes (on 0.2.0.x):
11825 - Actually return -1 in the error case for read_bandwidth_usage().
11826 Harmless bug, since we currently don't care about the return value
11827 anywhere. Bugfix on 0.2.0.9-alpha.
11828 - Provide a more useful log message if bug 977 (related to buffer
11829 freelists) ever reappears, and do not crash right away.
11830 - Fix an assertion failure on 64-bit platforms when we allocated
11831 memory right up to the end of a memarea, then realigned the memory
11832 one step beyond the end. Fixes a possible cause of bug 930.
11833 - Protect the count of open sockets with a mutex, so we can't
11834 corrupt it when two threads are closing or opening sockets at once.
11835 Fix for bug 939. Bugfix on 0.2.0.1-alpha.
11836 - Don't allow a bridge to publish its router descriptor to a
11837 non-bridge directory authority. Fixes part of bug 932.
11838 - When we change to or from being a bridge, reset our counts of
11839 client usage by country. Fixes bug 932.
11840 - Fix a bug that made stream bandwidth get misreported to the
11842 - Stop using malloc_usable_size() to use more area than we had
11843 actually allocated: it was safe, but made valgrind really unhappy.
11844 - Fix a memory leak when v3 directory authorities load their keys
11845 and cert from disk. Bugfix on 0.2.0.1-alpha.
11847 o Minor bugfixes (on 0.2.1.x):
11848 - Fix use of freed memory when deciding to mark a non-addable
11849 descriptor as never-downloadable. Bugfix on 0.2.1.9-alpha.
11852 Changes in version 0.2.1.14-rc - 2009-04-12
11853 Tor 0.2.1.14-rc marks the first release candidate for the 0.2.1.x
11854 series. It begins fixing some major performance problems, and also
11855 finally addresses the bug that was causing relays on dynamic IP
11856 addresses to fall out of the directory.
11859 - Clients replace entry guards that were chosen more than a few months
11860 ago. This change should significantly improve client performance,
11861 especially once more people upgrade, since relays that have been
11862 a guard for a long time are currently overloaded.
11864 o Major bugfixes (on 0.2.0):
11865 - Finally fix the bug where dynamic-IP relays disappear when their
11866 IP address changes: directory mirrors were mistakenly telling
11867 them their old address if they asked via begin_dir, so they
11868 never got an accurate answer about their new address, so they
11869 just vanished after a day. For belt-and-suspenders, relays that
11870 don't set Address in their config now avoid using begin_dir for
11871 all direct connections. Should fix bugs 827, 883, and 900.
11872 - Relays were falling out of the networkstatus consensus for
11873 part of a day if they changed their local config but the
11874 authorities discarded their new descriptor as "not sufficiently
11875 different". Now directory authorities accept a descriptor as changed
11876 if bandwidthrate or bandwidthburst changed. Partial fix for bug 962;
11877 patch by Sebastian.
11878 - Avoid crashing in the presence of certain malformed descriptors.
11879 Found by lark, and by automated fuzzing.
11882 - When generating circuit events with verbose nicknames for
11883 controllers, try harder to look up nicknames for routers on a
11884 circuit. (Previously, we would look in the router descriptors we had
11885 for nicknames, but not in the consensus.) Partial fix for bug 941.
11886 - If the bridge config line doesn't specify a port, assume 443.
11887 This makes bridge lines a bit smaller and easier for users to
11889 - Raise the minimum bandwidth to be a relay from 20000 bytes to 20480
11890 bytes (aka 20KB/s), to match our documentation. Also update
11891 directory authorities so they always assign the Fast flag to relays
11892 with 20KB/s of capacity. Now people running relays won't suddenly
11893 find themselves not seeing any use, if the network gets faster
11895 - Update to the "April 3 2009" ip-to-country file.
11898 - Avoid trying to print raw memory to the logs when we decide to
11899 give up on downloading a given relay descriptor. Bugfix on
11901 - In tor-resolve, when the Tor client to use is specified by
11902 <hostname>:<port>, actually use the specified port rather than
11903 defaulting to 9050. Bugfix on 0.2.1.6-alpha.
11904 - Make directory usage recording work again. Bugfix on 0.2.1.6-alpha.
11905 - When starting with a cache over a few days old, do not leak
11906 memory for the obsolete router descriptors in it. Bugfix on
11908 - Avoid double-free on list of successfully uploaded hidden
11909 service discriptors. Fix for bug 948. Bugfix on 0.2.1.6-alpha.
11910 - Change memarea_strndup() implementation to work even when
11911 duplicating a string at the end of a page. This bug was
11912 harmless for now, but could have meant crashes later. Fix by
11913 lark. Bugfix on 0.2.1.1-alpha.
11914 - Limit uploaded directory documents to be 16M rather than 500K.
11915 The directory authorities were refusing v3 consensus votes from
11916 other authorities, since the votes are now 504K. Fixes bug 959;
11917 bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
11918 - Directory authorities should never send a 503 "busy" response to
11919 requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
11923 Changes in version 0.2.1.13-alpha - 2009-03-09
11924 Tor 0.2.1.13-alpha includes another big pile of minor bugfixes and
11925 cleanups. We're finally getting close to a release candidate.
11928 - Correctly update the list of which countries we exclude as
11929 exits, when the GeoIP file is loaded or reloaded. Diagnosed by
11930 lark. Bugfix on 0.2.1.6-alpha.
11932 o Minor bugfixes (on 0.2.0.x and earlier):
11933 - Automatically detect MacOSX versions earlier than 10.4.0, and
11934 disable kqueue from inside Tor when running with these versions.
11935 We previously did this from the startup script, but that was no
11936 help to people who didn't use the startup script. Resolves bug 863.
11937 - When we had picked an exit node for a connection, but marked it as
11938 "optional", and it turned out we had no onion key for the exit,
11939 stop wanting that exit and try again. This situation may not
11940 be possible now, but will probably become feasible with proposal
11941 158. Spotted by rovv. Fixes another case of bug 752.
11942 - Clients no longer cache certificates for authorities they do not
11943 recognize. Bugfix on 0.2.0.9-alpha.
11944 - When we can't transmit a DNS request due to a network error, retry
11945 it after a while, and eventually transmit a failing response to
11946 the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
11947 - If the controller claimed responsibility for a stream, but that
11948 stream never finished making its connection, it would live
11949 forever in circuit_wait state. Now we close it after SocksTimeout
11950 seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
11951 - Drop begin cells to a hidden service if they come from the middle
11952 of a circuit. Patch from lark.
11953 - When we erroneously receive two EXTEND cells for the same circuit
11954 ID on the same connection, drop the second. Patch from lark.
11955 - Fix a crash that occurs on exit nodes when a nameserver request
11956 timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
11957 been suppressing the bug since 0.1.2.10-alpha. Partial fix for
11959 - Do not assume that a stack-allocated character array will be
11960 64-bit aligned on platforms that demand that uint64_t access is
11961 aligned. Possible fix for bug 604.
11962 - Parse dates and IPv4 addresses in a locale- and libc-independent
11963 manner, to avoid platform-dependent behavior on malformed input.
11964 - Build correctly when configured to build outside the main source
11965 path. Patch from Michael Gold.
11966 - We were already rejecting relay begin cells with destination port
11967 of 0. Now also reject extend cells with destination port or address
11968 of 0. Suggested by lark.
11970 o Minor bugfixes (on 0.2.1.x):
11971 - Don't re-extend introduction circuits if we ran out of RELAY_EARLY
11972 cells. Bugfix on 0.2.1.3-alpha. Fixes more of bug 878.
11973 - If we're an exit node, scrub the IP address to which we are exiting
11974 in the logs. Bugfix on 0.2.1.8-alpha.
11977 - On Linux, use the prctl call to re-enable core dumps when the user
11979 - New controller event NEWCONSENSUS that lists the networkstatus
11980 lines for every recommended relay. Now controllers like Torflow
11981 can keep up-to-date on which relays they should be using.
11982 - Update to the "February 26 2009" ip-to-country file.
11985 Changes in version 0.2.0.34 - 2009-02-08
11986 Tor 0.2.0.34 features several more security-related fixes. You should
11987 upgrade, especially if you run an exit relay (remote crash) or a
11988 directory authority (remote infinite loop), or you're on an older
11989 (pre-XP) or not-recently-patched Windows (remote exploit).
11991 This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
11992 have many known flaws, and nobody should be using them. You should
11993 upgrade. If you're using a Linux or BSD and its packages are obsolete,
11994 stop using those packages and upgrade anyway.
11997 - Fix an infinite-loop bug on handling corrupt votes under certain
11998 circumstances. Bugfix on 0.2.0.8-alpha.
11999 - Fix a temporary DoS vulnerability that could be performed by
12000 a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
12001 - Avoid a potential crash on exit nodes when processing malformed
12002 input. Remote DoS opportunity. Bugfix on 0.2.0.33.
12003 - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
12004 Spec conformance issue. Bugfix on Tor 0.0.2pre27.
12007 - Fix compilation on systems where time_t is a 64-bit integer.
12008 Patch from Matthias Drochner.
12009 - Don't consider expiring already-closed client connections. Fixes
12010 bug 893. Bugfix on 0.0.2pre20.
12013 Changes in version 0.2.1.12-alpha - 2009-02-08
12014 Tor 0.2.1.12-alpha features several more security-related fixes. You
12015 should upgrade, especially if you run an exit relay (remote crash) or
12016 a directory authority (remote infinite loop), or you're on an older
12017 (pre-XP) or not-recently-patched Windows (remote exploit). It also
12018 includes a big pile of minor bugfixes and cleanups.
12021 - Fix an infinite-loop bug on handling corrupt votes under certain
12022 circumstances. Bugfix on 0.2.0.8-alpha.
12023 - Fix a temporary DoS vulnerability that could be performed by
12024 a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
12025 - Avoid a potential crash on exit nodes when processing malformed
12026 input. Remote DoS opportunity. Bugfix on 0.2.1.7-alpha.
12029 - Let controllers actually ask for the "clients_seen" event for
12030 getting usage summaries on bridge relays. Bugfix on 0.2.1.10-alpha;
12031 reported by Matt Edman.
12032 - Fix a compile warning on OSX Panther. Fixes bug 913; bugfix against
12034 - Fix a bug in address parsing that was preventing bridges or hidden
12035 service targets from being at IPv6 addresses.
12036 - Solve a bug that kept hardware crypto acceleration from getting
12037 enabled when accounting was turned on. Fixes bug 907. Bugfix on
12039 - Remove a bash-ism from configure.in to build properly on non-Linux
12040 platforms. Bugfix on 0.2.1.1-alpha.
12041 - Fix code so authorities _actually_ send back X-Descriptor-Not-New
12042 headers. Bugfix on 0.2.0.10-alpha.
12043 - Don't consider expiring already-closed client connections. Fixes
12044 bug 893. Bugfix on 0.0.2pre20.
12045 - Fix another interesting corner-case of bug 891 spotted by rovv:
12046 Previously, if two hosts had different amounts of clock drift, and
12047 one of them created a new connection with just the wrong timing,
12048 the other might decide to deprecate the new connection erroneously.
12049 Bugfix on 0.1.1.13-alpha.
12050 - Resolve a very rare crash bug that could occur when the user forced
12051 a nameserver reconfiguration during the middle of a nameserver
12052 probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
12053 - Support changing value of ServerDNSRandomizeCase during SIGHUP.
12054 Bugfix on 0.2.1.7-alpha.
12055 - If we're using bridges and our network goes away, be more willing
12056 to forgive our bridges and try again when we get an application
12057 request. Bugfix on 0.2.0.x.
12060 - Support platforms where time_t is 64 bits long. (Congratulations,
12061 NetBSD!) Patch from Matthias Drochner.
12062 - Add a 'getinfo status/clients-seen' controller command, in case
12063 controllers want to hear clients_seen events but connect late.
12066 - Disable GCC's strict alias optimization by default, to avoid the
12067 likelihood of its introducing subtle bugs whenever our code violates
12068 the letter of C99's alias rules.
12071 Changes in version 0.2.0.33 - 2009-01-21
12072 Tor 0.2.0.33 fixes a variety of bugs that were making relays less
12073 useful to users. It also finally fixes a bug where a relay or client
12074 that's been off for many days would take a long time to bootstrap.
12076 This update also fixes an important security-related bug reported by
12077 Ilja van Sprundel. You should upgrade. (We'll send out more details
12078 about the bug once people have had some time to upgrade.)
12081 - Fix a heap-corruption bug that may be remotely triggerable on
12082 some platforms. Reported by Ilja van Sprundel.
12085 - When a stream at an exit relay is in state "resolving" or
12086 "connecting" and it receives an "end" relay cell, the exit relay
12087 would silently ignore the end cell and not close the stream. If
12088 the client never closes the circuit, then the exit relay never
12089 closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
12090 reported by "wood".
12091 - When sending CREATED cells back for a given circuit, use a 64-bit
12092 connection ID to find the right connection, rather than an addr:port
12093 combination. Now that we can have multiple OR connections between
12094 the same ORs, it is no longer possible to use addr:port to uniquely
12095 identify a connection.
12096 - Bridge relays that had DirPort set to 0 would stop fetching
12097 descriptors shortly after startup, and then briefly resume
12098 after a new bandwidth test and/or after publishing a new bridge
12099 descriptor. Bridge users that try to bootstrap from them would
12100 get a recent networkstatus but would get descriptors from up to
12101 18 hours earlier, meaning most of the descriptors were obsolete
12102 already. Reported by Tas; bugfix on 0.2.0.13-alpha.
12103 - Prevent bridge relays from serving their 'extrainfo' document
12104 to anybody who asks, now that extrainfo docs include potentially
12105 sensitive aggregated client geoip summaries. Bugfix on
12107 - If the cached networkstatus consensus is more than five days old,
12108 discard it rather than trying to use it. In theory it could be
12109 useful because it lists alternate directory mirrors, but in practice
12110 it just means we spend many minutes trying directory mirrors that
12111 are long gone from the network. Also discard router descriptors as
12112 we load them if they are more than five days old, since the onion
12113 key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
12116 - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
12117 could make gcc generate non-functional binary search code. Bugfix
12119 - Build correctly on platforms without socklen_t.
12120 - Compile without warnings on solaris.
12121 - Avoid potential crash on internal error during signature collection.
12122 Fixes bug 864. Patch from rovv.
12123 - Correct handling of possible malformed authority signing key
12124 certificates with internal signature types. Fixes bug 880.
12125 Bugfix on 0.2.0.3-alpha.
12126 - Fix a hard-to-trigger resource leak when logging credential status.
12128 - When we can't initialize DNS because the network is down, do not
12129 automatically stop Tor from starting. Instead, we retry failed
12130 dns_init() every 10 minutes, and change the exit policy to reject
12131 *:* until one succeeds. Fixes bug 691.
12132 - Use 64 bits instead of 32 bits for connection identifiers used with
12133 the controller protocol, to greatly reduce risk of identifier reuse.
12134 - When we're choosing an exit node for a circuit, and we have
12135 no pending streams, choose a good general exit rather than one that
12136 supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
12137 - Fix another case of assuming, when a specific exit is requested,
12138 that we know more than the user about what hosts it allows.
12139 Fixes one case of bug 752. Patch from rovv.
12140 - Clip the MaxCircuitDirtiness config option to a minimum of 10
12141 seconds. Warn the user if lower values are given in the
12142 configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
12143 - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
12144 user if lower values are given in the configuration. Bugfix on
12145 0.1.1.17-rc. Patch by Sebastian.
12146 - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
12147 the cache because we already had a v0 descriptor with the same ID.
12148 Bugfix on 0.2.0.18-alpha.
12149 - Fix a race condition when freeing keys shared between main thread
12150 and CPU workers that could result in a memory leak. Bugfix on
12151 0.1.0.1-rc. Fixes bug 889.
12152 - Send a valid END cell back when a client tries to connect to a
12153 nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
12154 840. Patch from rovv.
12155 - Check which hops rendezvous stream cells are associated with to
12156 prevent possible guess-the-streamid injection attacks from
12157 intermediate hops. Fixes another case of bug 446. Based on patch
12159 - If a broken client asks a non-exit router to connect somewhere,
12160 do not even do the DNS lookup before rejecting the connection.
12161 Fixes another case of bug 619. Patch from rovv.
12162 - When a relay gets a create cell it can't decrypt (e.g. because it's
12163 using the wrong onion key), we were dropping it and letting the
12164 client time out. Now actually answer with a destroy cell. Fixes
12165 bug 904. Bugfix on 0.0.2pre8.
12167 o Minor bugfixes (hidden services):
12168 - Do not throw away existing introduction points on SIGHUP. Bugfix on
12169 0.0.6pre1. Patch by Karsten. Fixes bug 874.
12172 - Report the case where all signatures in a detached set are rejected
12173 differently than the case where there is an error handling the
12175 - When we realize that another process has modified our cached
12176 descriptors, print out a more useful error message rather than
12177 triggering an assertion. Fixes bug 885. Patch from Karsten.
12178 - Implement the 0x20 hack to better resist DNS poisoning: set the
12179 case on outgoing DNS requests randomly, and reject responses that do
12180 not match the case correctly. This logic can be disabled with the
12181 ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
12182 of servers that do not reliably preserve case in replies. See
12183 "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
12185 - Check DNS replies for more matching fields to better resist DNS
12187 - Never use OpenSSL compression: it wastes RAM and CPU trying to
12188 compress cells, which are basically all encrypted, compressed, or
12192 Changes in version 0.2.1.11-alpha - 2009-01-20
12193 Tor 0.2.1.11-alpha finishes fixing the "if your Tor is off for a
12194 week it will take a long time to bootstrap again" bug. It also fixes
12195 an important security-related bug reported by Ilja van Sprundel. You
12196 should upgrade. (We'll send out more details about the bug once people
12197 have had some time to upgrade.)
12200 - Fix a heap-corruption bug that may be remotely triggerable on
12201 some platforms. Reported by Ilja van Sprundel.
12204 - Discard router descriptors as we load them if they are more than
12205 five days old. Otherwise if Tor is off for a long time and then
12206 starts with cached descriptors, it will try to use the onion
12207 keys in those obsolete descriptors when building circuits. Bugfix
12208 on 0.2.0.x. Fixes bug 887.
12211 - Try to make sure that the version of Libevent we're running with
12212 is binary-compatible with the one we built with. May address bug
12214 - Make setting ServerDNSRandomizeCase to 0 actually work. Bugfix
12215 for bug 905. Bugfix on 0.2.1.7-alpha.
12216 - Add a new --enable-local-appdata configuration switch to change
12217 the default location of the datadir on win32 from APPDATA to
12218 LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
12219 entirely. Patch from coderman.
12222 - Make outbound DNS packets respect the OutboundBindAddress setting.
12223 Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
12224 - When our circuit fails at the first hop (e.g. we get a destroy
12225 cell back), avoid using that OR connection anymore, and also
12226 tell all the one-hop directory requests waiting for it that they
12227 should fail. Bugfix on 0.2.1.3-alpha.
12228 - In the torify(1) manpage, mention that tsocks will leak your
12232 Changes in version 0.2.1.10-alpha - 2009-01-06
12233 Tor 0.2.1.10-alpha fixes two major bugs in bridge relays (one that
12234 would make the bridge relay not so useful if it had DirPort set to 0,
12235 and one that could let an attacker learn a little bit of information
12236 about the bridge's users), and a bug that would cause your Tor relay
12237 to ignore a circuit create request it can't decrypt (rather than reply
12238 with an error). It also fixes a wide variety of other bugs.
12241 - If the cached networkstatus consensus is more than five days old,
12242 discard it rather than trying to use it. In theory it could
12243 be useful because it lists alternate directory mirrors, but in
12244 practice it just means we spend many minutes trying directory
12245 mirrors that are long gone from the network. Helps bug 887 a bit;
12247 - Bridge relays that had DirPort set to 0 would stop fetching
12248 descriptors shortly after startup, and then briefly resume
12249 after a new bandwidth test and/or after publishing a new bridge
12250 descriptor. Bridge users that try to bootstrap from them would
12251 get a recent networkstatus but would get descriptors from up to
12252 18 hours earlier, meaning most of the descriptors were obsolete
12253 already. Reported by Tas; bugfix on 0.2.0.13-alpha.
12254 - Prevent bridge relays from serving their 'extrainfo' document
12255 to anybody who asks, now that extrainfo docs include potentially
12256 sensitive aggregated client geoip summaries. Bugfix on
12260 - New controller event "clients_seen" to report a geoip-based summary
12261 of which countries we've seen clients from recently. Now controllers
12262 like Vidalia can show bridge operators that they're actually making
12264 - Build correctly against versions of OpenSSL 0.9.8 or later built
12265 without support for deprecated functions.
12266 - Update to the "December 19 2008" ip-to-country file.
12268 o Minor bugfixes (on 0.2.0.x):
12269 - Authorities now vote for the Stable flag for any router whose
12270 weighted MTBF is at least 5 days, regardless of the mean MTBF.
12271 - Do not remove routers as too old if we do not have any consensus
12272 document. Bugfix on 0.2.0.7-alpha.
12273 - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
12274 Spec conformance issue. Bugfix on Tor 0.0.2pre27.
12275 - When an exit relay resolves a stream address to a local IP address,
12276 do not just keep retrying that same exit relay over and
12277 over. Instead, just close the stream. Addresses bug 872. Bugfix
12278 on 0.2.0.32. Patch from rovv.
12279 - If a hidden service sends us an END cell, do not consider
12280 retrying the connection; just close it. Patch from rovv.
12281 - When we made bridge authorities stop serving bridge descriptors over
12282 unencrypted links, we also broke DirPort reachability testing for
12283 bridges. So bridges with a non-zero DirPort were printing spurious
12284 warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
12285 - When a relay gets a create cell it can't decrypt (e.g. because it's
12286 using the wrong onion key), we were dropping it and letting the
12287 client time out. Now actually answer with a destroy cell. Fixes
12288 bug 904. Bugfix on 0.0.2pre8.
12289 - Squeeze 2-5% out of client performance (according to oprofile) by
12290 improving the implementation of some policy-manipulation functions.
12292 o Minor bugfixes (on 0.2.1.x):
12293 - Make get_interface_address() function work properly again; stop
12294 guessing the wrong parts of our address as our address.
12295 - Do not cannibalize a circuit if we're out of RELAY_EARLY cells to
12296 send on that circuit. Otherwise we might violate the proposal-110
12297 limit. Bugfix on 0.2.1.3-alpha. Partial fix for bug 878. Diagnosis
12299 - When we're sending non-EXTEND cells to the first hop in a circuit,
12300 for example to use an encrypted directory connection, we don't need
12301 to use RELAY_EARLY cells: the first hop knows what kind of cell
12302 it is, and nobody else can even see the cell type. Conserving
12303 RELAY_EARLY cells makes it easier to cannibalize circuits like
12305 - Stop logging nameserver addresses in reverse order.
12306 - If we are retrying a directory download slowly over and over, do
12307 not automatically give up after the 254th failure. Bugfix on
12309 - Resume reporting accurate "stream end" reasons to the local control
12310 port. They were lost in the changes for Proposal 148. Bugfix on
12313 o Deprecated and removed features:
12314 - The old "tor --version --version" command, which would print out
12315 the subversion "Id" of most of the source files, is now removed. It
12316 turned out to be less useful than we'd expected, and harder to
12319 o Code simplifications and refactoring:
12320 - Change our header file guard macros to be less likely to conflict
12321 with system headers. Adam Langley noticed that we were conflicting
12322 with log.h on Android.
12323 - Tool-assisted documentation cleanup. Nearly every function or
12324 static variable in Tor should have its own documentation now.
12327 Changes in version 0.2.1.9-alpha - 2008-12-25
12328 Tor 0.2.1.9-alpha fixes many more bugs, some of them security-related.
12330 o New directory authorities:
12331 - gabelmoo (the authority run by Karsten Loesing) now has a new
12335 - Never use a connection with a mismatched address to extend a
12336 circuit, unless that connection is canonical. A canonical
12337 connection is one whose address is authenticated by the router's
12338 identity key, either in a NETINFO cell or in a router descriptor.
12339 - Avoid a possible memory corruption bug when receiving hidden service
12340 descriptors. Bugfix on 0.2.1.6-alpha.
12343 - Fix a logic error that would automatically reject all but the first
12344 configured DNS server. Bugfix on 0.2.1.5-alpha. Possible fix for
12345 part of bug 813/868. Bug spotted by coderman.
12346 - When a stream at an exit relay is in state "resolving" or
12347 "connecting" and it receives an "end" relay cell, the exit relay
12348 would silently ignore the end cell and not close the stream. If
12349 the client never closes the circuit, then the exit relay never
12350 closes the TCP connection. Bug introduced in 0.1.2.1-alpha;
12351 reported by "wood".
12352 - When we can't initialize DNS because the network is down, do not
12353 automatically stop Tor from starting. Instead, retry failed
12354 dns_init() every 10 minutes, and change the exit policy to reject
12355 *:* until one succeeds. Fixes bug 691.
12358 - Give a better error message when an overzealous init script says
12359 "sudo -u username tor --user username". Makes Bug 882 easier for
12361 - When a directory authority gives us a new guess for our IP address,
12362 log which authority we used. Hopefully this will help us debug
12363 the recent complaints about bad IP address guesses.
12364 - Detect svn revision properly when we're using git-svn.
12365 - Try not to open more than one descriptor-downloading connection
12366 to an authority at once. This should reduce load on directory
12367 authorities. Fixes bug 366.
12368 - Add cross-certification to newly generated certificates, so that
12369 a signing key is enough information to look up a certificate.
12370 Partial implementation of proposal 157.
12371 - Start serving certificates by <identity digest, signing key digest>
12372 pairs. Partial implementation of proposal 157.
12373 - Clients now never report any stream end reason except 'MISC'.
12374 Implements proposal 148.
12375 - On platforms with a maximum syslog string length, truncate syslog
12376 messages to that length ourselves, rather than relying on the
12377 system to do it for us.
12378 - Optimize out calls to time(NULL) that occur for every IO operation,
12379 or for every cell. On systems where time() is a slow syscall,
12380 this fix will be slightly helpful.
12381 - Exit servers can now answer resolve requests for ip6.arpa addresses.
12382 - When we download a descriptor that we then immediately (as
12383 a directory authority) reject, do not retry downloading it right
12384 away. Should save some bandwidth on authorities. Fix for bug
12385 888. Patch by Sebastian Hahn.
12386 - When a download gets us zero good descriptors, do not notify
12387 Tor that new directory information has arrived.
12388 - Avoid some nasty corner cases in the logic for marking connections
12389 as too old or obsolete or noncanonical for circuits. Partial
12392 o Minor features (controller):
12393 - New CONSENSUS_ARRIVED event to note when a new consensus has
12394 been fetched and validated.
12395 - When we realize that another process has modified our cached
12396 descriptors file, print out a more useful error message rather
12397 than triggering an assertion. Fixes bug 885. Patch from Karsten.
12398 - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
12399 controllers to prevent SIGHUP from reloading the
12400 configuration. Fixes bug 856.
12403 - Resume using the correct "REASON=" stream when telling the
12404 controller why we closed a stream. Bugfix in 0.2.1.1-alpha.
12405 - When a canonical connection appears later in our internal list
12406 than a noncanonical one for a given OR ID, always use the
12407 canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
12409 - Clip the MaxCircuitDirtiness config option to a minimum of 10
12410 seconds. Warn the user if lower values are given in the
12411 configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
12412 - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
12413 user if lower values are given in the configuration. Bugfix on
12414 0.1.1.17-rc. Patch by Sebastian.
12415 - Fix a race condition when freeing keys shared between main thread
12416 and CPU workers that could result in a memory leak. Bugfix on
12417 0.1.0.1-rc. Fixes bug 889.
12419 o Minor bugfixes (hidden services):
12420 - Do not throw away existing introduction points on SIGHUP (bugfix on
12421 0.0.6pre1); also, do not stall hidden services because we're
12422 throwing away introduction points; bugfix on 0.2.1.7-alpha. Spotted
12423 by John Brooks. Patch by Karsten. Fixes bug 874.
12424 - Fix a memory leak when we decline to add a v2 rendezvous
12425 descriptor to the cache because we already had a v0 descriptor
12426 with the same ID. Bugfix on 0.2.0.18-alpha.
12428 o Deprecated and removed features:
12429 - RedirectExits has been removed. It was deprecated since
12431 - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
12432 has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
12433 - Cell pools are now always enabled; --disable-cell-pools is ignored.
12435 o Code simplifications and refactoring:
12436 - Rename the confusing or_is_obsolete field to the more appropriate
12437 is_bad_for_new_circs, and move it to or_connection_t where it
12439 - Move edge-only flags from connection_t to edge_connection_t: not
12440 only is this better coding, but on machines of plausible alignment,
12441 it should save 4-8 bytes per connection_t. "Every little bit helps."
12442 - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
12443 for consistency; keep old option working for backward compatibility.
12444 - Simplify the code for finding connections to use for a circuit.
12447 Changes in version 0.2.1.8-alpha - 2008-12-08
12448 Tor 0.2.1.8-alpha fixes some crash bugs in earlier alpha releases,
12449 builds better on unusual platforms like Solaris and old OS X, and
12450 fixes a variety of other issues.
12453 - New DirPortFrontPage option that takes an html file and publishes
12454 it as "/" on the DirPort. Now relay operators can provide a
12455 disclaimer without needing to set up a separate webserver. There's
12456 a sample disclaimer in contrib/tor-exit-notice.html.
12459 - When the client is choosing entry guards, now it selects at most
12460 one guard from a given relay family. Otherwise we could end up with
12461 all of our entry points into the network run by the same operator.
12462 Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
12465 - Fix a DOS opportunity during the voting signature collection process
12466 at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
12467 - Fix a possible segfault when establishing an exit connection. Bugfix
12471 - Get file locking working on win32. Bugfix on 0.2.1.6-alpha. Fixes
12473 - Made Tor a little less aggressive about deleting expired
12474 certificates. Partial fix for bug 854.
12475 - Stop doing unaligned memory access that generated bus errors on
12476 sparc64. Bugfix on 0.2.0.10-alpha. Fix for bug 862.
12477 - Fix a crash bug when changing EntryNodes from the controller. Bugfix
12478 on 0.2.1.6-alpha. Fix for bug 867. Patched by Sebastian.
12479 - Make USR2 log-level switch take effect immediately. Bugfix on
12481 - If one win32 nameserver fails to get added, continue adding the
12482 rest, and don't automatically fail.
12483 - Use fcntl() for locking when flock() is not available. Should fix
12484 compilation on Solaris. Should fix Bug 873. Bugfix on 0.2.1.6-alpha.
12485 - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
12486 could make gcc generate non-functional binary search code. Bugfix
12488 - Build correctly on platforms without socklen_t.
12489 - Avoid potential crash on internal error during signature collection.
12490 Fixes bug 864. Patch from rovv.
12491 - Do not use C's stdio library for writing to log files. This will
12492 improve logging performance by a minute amount, and will stop
12493 leaking fds when our disk is full. Fixes bug 861.
12494 - Stop erroneous use of O_APPEND in cases where we did not in fact
12495 want to re-seek to the end of a file before every last write().
12496 - Correct handling of possible malformed authority signing key
12497 certificates with internal signature types. Fixes bug 880. Bugfix
12499 - Fix a hard-to-trigger resource leak when logging credential status.
12503 - Directory mirrors no longer fetch the v1 directory or
12504 running-routers files. They are obsolete, and nobody asks for them
12505 anymore. This is the first step to making v1 authorities obsolete.
12507 o Minor features (controller):
12508 - Return circuit purposes in response to GETINFO circuit-status. Fixes
12512 Changes in version 0.2.0.32 - 2008-11-20
12513 Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
12514 packages (and maybe other packages) noticed by Theo de Raadt, fixes
12515 a smaller security flaw that might allow an attacker to access local
12516 services, further improves hidden service performance, and fixes a
12517 variety of other issues.
12520 - The "User" and "Group" config options did not clear the
12521 supplementary group entries for the Tor process. The "User" option
12522 is now more robust, and we now set the groups to the specified
12523 user's primary group. The "Group" option is now ignored. For more
12524 detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
12525 in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
12526 and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
12527 - The "ClientDNSRejectInternalAddresses" config option wasn't being
12528 consistently obeyed: if an exit relay refuses a stream because its
12529 exit policy doesn't allow it, we would remember what IP address
12530 the relay said the destination address resolves to, even if it's
12531 an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
12534 - Fix a DOS opportunity during the voting signature collection process
12535 at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
12537 o Major bugfixes (hidden services):
12538 - When fetching v0 and v2 rendezvous service descriptors in parallel,
12539 we were failing the whole hidden service request when the v0
12540 descriptor fetch fails, even if the v2 fetch is still pending and
12541 might succeed. Similarly, if the last v2 fetch fails, we were
12542 failing the whole hidden service request even if a v0 fetch is
12543 still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
12544 - When extending a circuit to a hidden service directory to upload a
12545 rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
12546 requests failed, because the router descriptor has not been
12547 downloaded yet. In these cases, do not attempt to upload the
12548 rendezvous descriptor, but wait until the router descriptor is
12549 downloaded and retry. Likewise, do not attempt to fetch a rendezvous
12550 descriptor from a hidden service directory for which the router
12551 descriptor has not yet been downloaded. Fixes bug 767. Bugfix
12555 - Fix several infrequent memory leaks spotted by Coverity.
12556 - When testing for libevent functions, set the LDFLAGS variable
12557 correctly. Found by Riastradh.
12558 - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
12559 bootstrapping with tunneled directory connections. Bugfix on
12560 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
12561 - When asked to connect to A.B.exit:80, if we don't know the IP for A
12562 and we know that server B rejects most-but-not all connections to
12563 port 80, we would previously reject the connection. Now, we assume
12564 the user knows what they were asking for. Fixes bug 752. Bugfix
12565 on 0.0.9rc5. Diagnosed by BarkerJr.
12566 - If we overrun our per-second write limits a little, count this as
12567 having used up our write allocation for the second, and choke
12568 outgoing directory writes. Previously, we had only counted this when
12569 we had met our limits precisely. Fixes bug 824. Patch from by rovv.
12570 Bugfix on 0.2.0.x (??).
12571 - Remove the old v2 directory authority 'lefkada' from the default
12572 list. It has been gone for many months.
12573 - Stop doing unaligned memory access that generated bus errors on
12574 sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
12575 - Make USR2 log-level switch take effect immediately. Bugfix on
12578 o Minor bugfixes (controller):
12579 - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
12580 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
12583 Changes in version 0.2.1.7-alpha - 2008-11-08
12584 Tor 0.2.1.7-alpha fixes a major security problem in Debian and Ubuntu
12585 packages (and maybe other packages) noticed by Theo de Raadt, fixes
12586 a smaller security flaw that might allow an attacker to access local
12587 services, adds better defense against DNS poisoning attacks on exit
12588 relays, further improves hidden service performance, and fixes a
12589 variety of other issues.
12592 - The "ClientDNSRejectInternalAddresses" config option wasn't being
12593 consistently obeyed: if an exit relay refuses a stream because its
12594 exit policy doesn't allow it, we would remember what IP address
12595 the relay said the destination address resolves to, even if it's
12596 an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
12597 - The "User" and "Group" config options did not clear the
12598 supplementary group entries for the Tor process. The "User" option
12599 is now more robust, and we now set the groups to the specified
12600 user's primary group. The "Group" option is now ignored. For more
12601 detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
12602 in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
12603 and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848.
12604 - Do not use or believe expired v3 authority certificates. Patch
12605 from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
12608 - Now NodeFamily and MyFamily config options allow spaces in
12609 identity fingerprints, so it's easier to paste them in.
12610 Suggested by Lucky Green.
12611 - Implement the 0x20 hack to better resist DNS poisoning: set the
12612 case on outgoing DNS requests randomly, and reject responses that do
12613 not match the case correctly. This logic can be disabled with the
12614 ServerDNSRandomizeCase setting, if you are using one of the 0.3%
12615 of servers that do not reliably preserve case in replies. See
12616 "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
12618 - Preserve case in replies to DNSPort requests in order to support
12619 the 0x20 hack for resisting DNS poisoning attacks.
12621 o Hidden service performance improvements:
12622 - When the client launches an introduction circuit, retry with a
12623 new circuit after 30 seconds rather than 60 seconds.
12624 - Launch a second client-side introduction circuit in parallel
12625 after a delay of 15 seconds (based on work by Christian Wilms).
12626 - Hidden services start out building five intro circuits rather
12627 than three, and when the first three finish they publish a service
12628 descriptor using those. Now we publish our service descriptor much
12629 faster after restart.
12632 - Minor fix in the warning messages when you're having problems
12633 bootstrapping; also, be more forgiving of bootstrap problems when
12634 we're still making incremental progress on a given bootstrap phase.
12635 - When we're choosing an exit node for a circuit, and we have
12636 no pending streams, choose a good general exit rather than one that
12637 supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
12638 - Send a valid END cell back when a client tries to connect to a
12639 nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
12640 840. Patch from rovv.
12641 - If a broken client asks a non-exit router to connect somewhere,
12642 do not even do the DNS lookup before rejecting the connection.
12643 Fixes another case of bug 619. Patch from rovv.
12644 - Fix another case of assuming, when a specific exit is requested,
12645 that we know more than the user about what hosts it allows.
12646 Fixes another case of bug 752. Patch from rovv.
12647 - Check which hops rendezvous stream cells are associated with to
12648 prevent possible guess-the-streamid injection attacks from
12649 intermediate hops. Fixes another case of bug 446. Based on patch
12651 - Avoid using a negative right-shift when comparing 32-bit
12652 addresses. Possible fix for bug 845 and bug 811.
12653 - Make the assert_circuit_ok() function work correctly on circuits that
12654 have already been marked for close.
12655 - Fix read-off-the-end-of-string error in unit tests when decoding
12656 introduction points.
12657 - Fix uninitialized size field for memory area allocation: may improve
12658 memory performance during directory parsing.
12659 - Treat duplicate certificate fetches as failures, so that we do
12660 not try to re-fetch an expired certificate over and over and over.
12661 - Do not say we're fetching a certificate when we'll in fact skip it
12662 because of a pending download.
12665 Changes in version 0.2.1.6-alpha - 2008-09-30
12666 Tor 0.2.1.6-alpha further improves performance and robustness of
12667 hidden services, starts work on supporting per-country relay selection,
12668 and fixes a variety of smaller issues.
12671 - Implement proposal 121: make it possible to build hidden services
12672 that only certain clients are allowed to connect to. This is
12673 enforced at several points, so that unauthorized clients are unable
12674 to send INTRODUCE cells to the service, or even (depending on the
12675 type of authentication) to learn introduction points. This feature
12676 raises the bar for certain kinds of active attacks against hidden
12677 services. Code by Karsten Loesing.
12678 - Relays now store and serve v2 hidden service descriptors by default,
12679 i.e., the new default value for HidServDirectoryV2 is 1. This is
12680 the last step in proposal 114, which aims to make hidden service
12681 lookups more reliable.
12682 - Start work to allow node restrictions to include country codes. The
12683 syntax to exclude nodes in a country with country code XX is
12684 "ExcludeNodes {XX}". Patch from Robert Hogan. It still needs some
12685 refinement to decide what config options should take priority if
12686 you ask to both use a particular node and exclude it.
12687 - Allow ExitNodes list to include IP ranges and country codes, just
12688 like the Exclude*Nodes lists. Patch from Robert Hogan.
12691 - Fix a bug when parsing ports in tor_addr_port_parse() that caused
12692 Tor to fail to start if you had it configured to use a bridge
12693 relay. Fixes bug 809. Bugfix on 0.2.1.5-alpha.
12694 - When extending a circuit to a hidden service directory to upload a
12695 rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
12696 requests failed, because the router descriptor had not been
12697 downloaded yet. In these cases, we now wait until the router
12698 descriptor is downloaded, and then retry. Likewise, clients
12699 now skip over a hidden service directory if they don't yet have
12700 its router descriptor, rather than futilely requesting it and
12701 putting mysterious complaints in the logs. Fixes bug 767. Bugfix
12703 - When fetching v0 and v2 rendezvous service descriptors in parallel,
12704 we were failing the whole hidden service request when the v0
12705 descriptor fetch fails, even if the v2 fetch is still pending and
12706 might succeed. Similarly, if the last v2 fetch fails, we were
12707 failing the whole hidden service request even if a v0 fetch is
12708 still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
12709 - DNS replies need to have names matching their requests, but
12710 these names should be in the questions section, not necessarily
12711 in the answers section. Fixes bug 823. Bugfix on 0.2.1.5-alpha.
12714 - Update to the "September 1 2008" ip-to-country file.
12715 - Allow ports 465 and 587 in the default exit policy again. We had
12716 rejected them in 0.1.0.15, because back in 2005 they were commonly
12717 misconfigured and ended up as spam targets. We hear they are better
12718 locked down these days.
12719 - Use a lockfile to make sure that two Tor processes are not
12720 simultaneously running with the same datadir.
12721 - Serve the latest v3 networkstatus consensus via the control
12722 port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
12723 - Better logging about stability/reliability calculations on directory
12725 - Drop the requirement to have an open dir port for storing and
12726 serving v2 hidden service descriptors.
12727 - Directory authorities now serve a /tor/dbg-stability.txt URL to
12728 help debug WFU and MTBF calculations.
12729 - Implement most of Proposal 152: allow specialized servers to permit
12730 single-hop circuits, and clients to use those servers to build
12731 single-hop circuits when using a specialized controller. Patch
12732 from Josh Albrecht. Resolves feature request 768.
12733 - Add a -p option to tor-resolve for specifying the SOCKS port: some
12734 people find host:port too confusing.
12735 - Make TrackHostExit mappings expire a while after their last use, not
12736 after their creation. Patch from Robert Hogan.
12737 - Provide circuit purposes along with circuit events to the controller.
12740 - Fix compile on OpenBSD 4.4-current. Bugfix on 0.2.1.5-alpha.
12742 - Fixed some memory leaks -- some quite frequent, some almost
12743 impossible to trigger -- based on results from Coverity.
12744 - When testing for libevent functions, set the LDFLAGS variable
12745 correctly. Found by Riastradh.
12746 - Fix an assertion bug in parsing policy-related options; possible fix
12748 - Catch and report a few more bootstrapping failure cases when Tor
12749 fails to establish a TCP connection. Cleanup on 0.2.1.x.
12750 - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
12751 bootstrapping with tunneled directory connections. Bugfix on
12752 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
12753 - When asked to connect to A.B.exit:80, if we don't know the IP for A
12754 and we know that server B rejects most-but-not all connections to
12755 port 80, we would previously reject the connection. Now, we assume
12756 the user knows what they were asking for. Fixes bug 752. Bugfix
12757 on 0.0.9rc5. Diagnosed by BarkerJr.
12758 - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
12759 service directories if they have no advertised dir port. Bugfix
12761 - If we overrun our per-second write limits a little, count this as
12762 having used up our write allocation for the second, and choke
12763 outgoing directory writes. Previously, we had only counted this when
12764 we had met our limits precisely. Fixes bug 824. Patch by rovv.
12765 Bugfix on 0.2.0.x (??).
12766 - Avoid a "0 divided by 0" calculation when calculating router uptime
12767 at directory authorities. Bugfix on 0.2.0.8-alpha.
12768 - Make DNS resolved controller events into "CLOSED", not
12769 "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
12771 - Fix a bug where an unreachable relay would establish enough
12772 reachability testing circuits to do a bandwidth test -- if
12773 we already have a connection to the middle hop of the testing
12774 circuit, then it could establish the last hop by using the existing
12775 connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
12776 circuits no longer use entry guards in 0.2.1.3-alpha.
12777 - If we have correct permissions on $datadir, we complain to stdout
12778 and fail to start. But dangerous permissions on
12779 $datadir/cached-status/ would cause us to open a log and complain
12780 there. Now complain to stdout and fail to start in both cases. Fixes
12781 bug 820, reported by seeess.
12782 - Remove the old v2 directory authority 'lefkada' from the default
12783 list. It has been gone for many months.
12785 o Code simplifications and refactoring:
12786 - Revise the connection_new functions so that a more typesafe variant
12787 exists. This will work better with Coverity, and let us find any
12788 actual mistakes we're making here.
12789 - Refactor unit testing logic so that dmalloc can be used sensibly
12790 with unit tests to check for memory leaks.
12791 - Move all hidden-service related fields from connection and circuit
12792 structure to substructures: this way they won't eat so much memory.
12795 Changes in version 0.2.0.31 - 2008-09-03
12796 Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
12797 a big bug we're seeing where in rare cases traffic from one Tor stream
12798 gets mixed into another stream, and fixes a variety of smaller issues.
12801 - Make sure that two circuits can never exist on the same connection
12802 with the same circuit ID, even if one is marked for close. This
12803 is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
12804 - Relays now reject risky extend cells: if the extend cell includes
12805 a digest of all zeroes, or asks to extend back to the relay that
12806 sent the extend cell, tear down the circuit. Ideas suggested
12808 - If not enough of our entry guards are available so we add a new
12809 one, we might use the new one even if it overlapped with the
12810 current circuit's exit relay (or its family). Anonymity bugfix
12811 pointed out by rovv.
12814 - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
12815 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
12816 - Correctly detect the presence of the linux/netfilter_ipv4.h header
12817 when building against recent kernels. Bugfix on 0.1.2.1-alpha.
12818 - Pick size of default geoip filename string correctly on windows.
12819 Fixes bug 806. Bugfix on 0.2.0.30.
12820 - Make the autoconf script accept the obsolete --with-ssl-dir
12821 option as an alias for the actually-working --with-openssl-dir
12822 option. Fix the help documentation to recommend --with-openssl-dir.
12823 Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
12824 - When using the TransPort option on OpenBSD, and using the User
12825 option to change UID and drop privileges, make sure to open
12826 /dev/pf before dropping privileges. Fixes bug 782. Patch from
12827 Christopher Davis. Bugfix on 0.1.2.1-alpha.
12828 - Try to attach connections immediately upon receiving a RENDEZVOUS2
12829 or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
12830 on the client side when connecting to a hidden service. Bugfix
12831 on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
12832 - When closing an application-side connection because its circuit is
12833 getting torn down, generate the stream event correctly. Bugfix on
12834 0.1.2.x. Anonymous patch.
12837 Changes in version 0.2.1.5-alpha - 2008-08-31
12838 Tor 0.2.1.5-alpha moves us closer to handling IPv6 destinations, puts
12839 in a lot of the infrastructure for adding authorization to hidden
12840 services, lays the groundwork for having clients read their load
12841 balancing information out of the networkstatus consensus rather than
12842 the individual router descriptors, addresses two potential anonymity
12843 issues, and fixes a variety of smaller issues.
12846 - Convert many internal address representations to optionally hold
12848 - Generate and accept IPv6 addresses in many protocol elements.
12849 - Make resolver code handle nameservers located at ipv6 addresses.
12850 - Begin implementation of proposal 121 ("Client authorization for
12851 hidden services"): configure hidden services with client
12852 authorization, publish descriptors for them, and configure
12853 authorization data for hidden services at clients. The next
12854 step is to actually access hidden services that perform client
12856 - More progress toward proposal 141: Network status consensus
12857 documents and votes now contain bandwidth information for each
12858 router and a summary of that router's exit policy. Eventually this
12859 will be used by clients so that they do not have to download every
12860 known descriptor before building circuits.
12862 o Major bugfixes (on 0.2.0.x and before):
12863 - When sending CREATED cells back for a given circuit, use a 64-bit
12864 connection ID to find the right connection, rather than an addr:port
12865 combination. Now that we can have multiple OR connections between
12866 the same ORs, it is no longer possible to use addr:port to uniquely
12867 identify a connection.
12868 - Relays now reject risky extend cells: if the extend cell includes
12869 a digest of all zeroes, or asks to extend back to the relay that
12870 sent the extend cell, tear down the circuit. Ideas suggested
12872 - If not enough of our entry guards are available so we add a new
12873 one, we might use the new one even if it overlapped with the
12874 current circuit's exit relay (or its family). Anonymity bugfix
12875 pointed out by rovv.
12878 - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
12879 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
12880 - When using the TransPort option on OpenBSD, and using the User
12881 option to change UID and drop privileges, make sure to open /dev/pf
12882 before dropping privileges. Fixes bug 782. Patch from Christopher
12883 Davis. Bugfix on 0.1.2.1-alpha.
12884 - Correctly detect the presence of the linux/netfilter_ipv4.h header
12885 when building against recent kernels. Bugfix on 0.1.2.1-alpha.
12886 - Add a missing safe_str() call for a debug log message.
12887 - Use 64 bits instead of 32 bits for connection identifiers used with
12888 the controller protocol, to greatly reduce risk of identifier reuse.
12889 - Make the autoconf script accept the obsolete --with-ssl-dir
12890 option as an alias for the actually-working --with-openssl-dir
12891 option. Fix the help documentation to recommend --with-openssl-dir.
12892 Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
12895 - Rate-limit too-many-sockets messages: when they happen, they happen
12896 a lot. Resolves bug 748.
12897 - Resist DNS poisoning a little better by making sure that names in
12898 answer sections match.
12899 - Print the SOCKS5 error message string as well as the error code
12900 when a tor-resolve request fails. Patch from Jacob.
12903 Changes in version 0.2.1.4-alpha - 2008-08-04
12904 Tor 0.2.1.4-alpha fixes a pair of crash bugs in 0.2.1.3-alpha.
12907 - The address part of exit policies was not correctly written
12908 to router descriptors. This generated router descriptors that failed
12909 their self-checks. Noticed by phobos, fixed by Karsten. Bugfix
12911 - Tor triggered a false assert when extending a circuit to a relay
12912 but we already have a connection open to that relay. Noticed by
12913 phobos, fixed by Karsten. Bugfix on 0.2.1.3-alpha.
12916 - Fix a hidden service logging bug: in some edge cases, the router
12917 descriptor of a previously picked introduction point becomes
12918 obsolete and we need to give up on it rather than continually
12919 complaining that it has become obsolete. Observed by xiando. Bugfix
12922 o Removed features:
12923 - Take out the TestVia config option, since it was a workaround for
12924 a bug that was fixed in Tor 0.1.1.21.
12927 Changes in version 0.2.1.3-alpha - 2008-08-03
12928 Tor 0.2.1.3-alpha implements most of the pieces to prevent
12929 infinite-length circuit attacks (see proposal 110); fixes a bug that
12930 might cause exit relays to corrupt streams they send back; allows
12931 address patterns (e.g. 255.128.0.0/16) to appear in ExcludeNodes and
12932 ExcludeExitNodes config options; and fixes a big pile of bugs.
12934 o Bootstrapping bugfixes (on 0.2.1.x-alpha):
12935 - Send a bootstrap problem "warn" event on the first problem if the
12936 reason is NO_ROUTE (that is, our network is down).
12939 - Implement most of proposal 110: The first K cells to be sent
12940 along a circuit are marked as special "early" cells; only K "early"
12941 cells will be allowed. Once this code is universal, we can block
12942 certain kinds of DOS attack by requiring that EXTEND commands must
12943 be sent using an "early" cell.
12946 - Try to attach connections immediately upon receiving a RENDEZVOUS2
12947 or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
12948 on the client side when connecting to a hidden service. Bugfix
12949 on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
12950 - Ensure that two circuits can never exist on the same connection
12951 with the same circuit ID, even if one is marked for close. This
12952 is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
12955 - When relays do their initial bandwidth measurement, don't limit
12956 to just our entry guards for the test circuits. Otherwise we tend
12957 to have multiple test circuits going through a single entry guard,
12958 which makes our bandwidth test less accurate. Fixes part of bug 654;
12959 patch contributed by Josh Albrecht.
12960 - Add an ExcludeExitNodes option so users can list a set of nodes
12961 that should be be excluded from the exit node position, but
12962 allowed elsewhere. Implements proposal 151.
12963 - Allow address patterns (e.g., 255.128.0.0/16) to appear in
12964 ExcludeNodes and ExcludeExitNodes lists.
12965 - Change the implementation of ExcludeNodes and ExcludeExitNodes to
12966 be more efficient. Formerly it was quadratic in the number of
12967 servers; now it should be linear. Fixes bug 509.
12968 - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
12969 and n_conn_id_digest fields into a separate structure that's
12970 only needed when the circuit has not yet attached to an n_conn.
12973 - Change the contrib/tor.logrotate script so it makes the new
12974 logs as "_tor:_tor" rather than the default, which is generally
12975 "root:wheel". Fixes bug 676, reported by Serge Koksharov.
12976 - Stop using __attribute__((nonnull)) with GCC: it can give us useful
12977 warnings (occasionally), but it can also cause the compiler to
12978 eliminate error-checking code. Suggested by Peter Gutmann.
12979 - When a hidden service is giving up on an introduction point candidate
12980 that was not included in the last published rendezvous descriptor,
12981 don't reschedule publication of the next descriptor. Fixes bug 763.
12983 - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
12984 HiddenServiceExcludeNodes as obsolete: they never worked properly,
12985 and nobody claims to be using them. Fixes bug 754. Bugfix on
12986 0.1.0.1-rc. Patch from Christian Wilms.
12987 - Fix a small alignment and memory-wasting bug on buffer chunks.
12990 o Minor bugfixes (controller):
12991 - When closing an application-side connection because its circuit
12992 is getting torn down, generate the stream event correctly.
12993 Bugfix on 0.1.2.x. Anonymous patch.
12995 o Removed features:
12996 - Remove all backward-compatibility code to support relays running
12997 versions of Tor so old that they no longer work at all on the
13001 Changes in version 0.2.0.30 - 2008-07-15
13003 - Stop using __attribute__((nonnull)) with GCC: it can give us useful
13004 warnings (occasionally), but it can also cause the compiler to
13005 eliminate error-checking code. Suggested by Peter Gutmann.
13008 Changes in version 0.2.0.29-rc - 2008-07-08
13009 Tor 0.2.0.29-rc fixes two big bugs with using bridges, fixes more
13010 hidden-service performance bugs, and fixes a bunch of smaller bugs.
13013 - If you have more than one bridge but don't know their keys,
13014 you would only launch a request for the descriptor of the first one
13015 on your list. (Tor considered launching requests for the others, but
13016 found that it already had a connection on the way for $0000...0000
13017 so it didn't open another.) Bugfix on 0.2.0.x.
13018 - If you have more than one bridge but don't know their keys, and the
13019 connection to one of the bridges failed, you would cancel all
13020 pending bridge connections. (After all, they all have the same
13021 digest.) Bugfix on 0.2.0.x.
13022 - When a hidden service was trying to establish an introduction point,
13023 and Tor had built circuits preemptively for such purposes, we
13024 were ignoring all the preemptive circuits and launching a new one
13025 instead. Bugfix on 0.2.0.14-alpha.
13026 - When a hidden service was trying to establish an introduction point,
13027 and Tor *did* manage to reuse one of the preemptively built
13028 circuits, it didn't correctly remember which one it used,
13029 so it asked for another one soon after, until there were no
13030 more preemptive circuits, at which point it launched one from
13031 scratch. Bugfix on 0.0.9.x.
13032 - Make directory servers include the X-Your-Address-Is: http header in
13033 their responses even for begin_dir conns. Now clients who only
13034 ever use begin_dir connections still have a way to learn their IP
13035 address. Fixes bug 737; bugfix on 0.2.0.22-rc. Reported by goldy.
13038 - Fix a macro/CPP interaction that was confusing some compilers:
13039 some GCCs don't like #if/#endif pairs inside macro arguments.
13041 - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
13042 Fixes bug 704; fix from Steven Murdoch.
13043 - When opening /dev/null in finish_daemonize(), do not pass the
13044 O_CREAT flag. Fortify was complaining, and correctly so. Fixes
13045 bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
13046 - Correctly detect transparent proxy support on Linux hosts that
13047 require in.h to be included before netfilter_ipv4.h. Patch
13049 - Disallow session resumption attempts during the renegotiation
13050 stage of the v2 handshake protocol. Clients should never be trying
13051 session resumption at this point, but apparently some did, in
13052 ways that caused the handshake to fail. Bugfix on 0.2.0.20-rc. Bug
13053 found by Geoff Goodell.
13056 Changes in version 0.2.1.2-alpha - 2008-06-20
13057 Tor 0.2.1.2-alpha includes a new "TestingTorNetwork" config option to
13058 make it easier to set up your own private Tor network; fixes several
13059 big bugs with using more than one bridge relay; fixes a big bug with
13060 offering hidden services quickly after Tor starts; and uses a better
13061 API for reporting potential bootstrapping problems to the controller.
13064 - New TestingTorNetwork config option to allow adjustment of
13065 previously constant values that, while reasonable, could slow
13066 bootstrapping. Implements proposal 135. Patch from Karsten.
13069 - If you have more than one bridge but don't know their digests,
13070 you would only learn a request for the descriptor of the first one
13071 on your list. (Tor considered launching requests for the others, but
13072 found that it already had a connection on the way for $0000...0000
13073 so it didn't open another.) Bugfix on 0.2.0.x.
13074 - If you have more than one bridge but don't know their digests,
13075 and the connection to one of the bridges failed, you would cancel
13076 all pending bridge connections. (After all, they all have the
13077 same digest.) Bugfix on 0.2.0.x.
13078 - When establishing a hidden service, introduction points that
13079 originate from cannibalized circuits are completely ignored and not
13080 included in rendezvous service descriptors. This might be another
13081 reason for delay in making a hidden service available. Bugfix
13082 from long ago (0.0.9.x?)
13085 - Allow OpenSSL to use dynamic locks if it wants.
13086 - When building a consensus, do not include routers that are down.
13087 This will cut down 30% to 40% on consensus size. Implements
13089 - In directory authorities' approved-routers files, allow
13090 fingerprints with or without space.
13091 - Add a "GETINFO /status/bootstrap-phase" controller option, so the
13092 controller can query our current bootstrap state in case it attaches
13093 partway through and wants to catch up.
13094 - Send an initial "Starting" bootstrap status event, so we have a
13095 state to start out in.
13098 - Asking for a conditional consensus at .../consensus/<fingerprints>
13099 would crash a dirserver if it did not already have a
13100 consensus. Bugfix on 0.2.1.1-alpha.
13101 - Clean up some macro/CPP interactions: some GCC versions don't like
13102 #if/#endif pairs inside macro arguments. Fixes bug 707. Bugfix on
13105 o Bootstrapping bugfixes (on 0.2.1.1-alpha):
13106 - Directory authorities shouldn't complain about bootstrapping
13107 problems just because they do a lot of reachability testing and
13108 some of the connection attempts fail.
13109 - Start sending "count" and "recommendation" key/value pairs in
13110 bootstrap problem status events, so the controller can hear about
13111 problems even before Tor decides they're worth reporting for sure.
13112 - If you're using bridges, generate "bootstrap problem" warnings
13113 as soon as you run out of working bridges, rather than waiting
13114 for ten failures -- which will never happen if you have less than
13116 - If we close our OR connection because there's been a circuit
13117 pending on it for too long, we were telling our bootstrap status
13118 events "REASON=NONE". Now tell them "REASON=TIMEOUT".
13121 Changes in version 0.2.1.1-alpha - 2008-06-13
13122 Tor 0.2.1.1-alpha fixes a lot of memory fragmentation problems that
13123 were making the Tor process bloat especially on Linux; makes our TLS
13124 handshake blend in better; sends "bootstrap phase" status events to
13125 the controller, so it can keep the user informed of progress (and
13126 problems) fetching directory information and establishing circuits;
13127 and adds a variety of smaller features.
13130 - More work on making our TLS handshake blend in: modify the list
13131 of ciphers advertised by OpenSSL in client mode to even more
13132 closely resemble a common web browser. We cheat a little so that
13133 we can advertise ciphers that the locally installed OpenSSL doesn't
13135 - Start sending "bootstrap phase" status events to the controller,
13136 so it can keep the user informed of progress fetching directory
13137 information and establishing circuits. Also inform the controller
13138 if we think we're stuck at a particular bootstrap phase. Implements
13140 - Resume using OpenSSL's RAND_poll() for better (and more portable)
13141 cross-platform entropy collection again. We used to use it, then
13142 stopped using it because of a bug that could crash systems that
13143 called RAND_poll when they had a lot of fds open. It looks like the
13144 bug got fixed in late 2006. Our new behavior is to call RAND_poll()
13145 at startup, and to call RAND_poll() when we reseed later only if
13146 we have a non-buggy OpenSSL version.
13149 - When we choose to abandon a new entry guard because we think our
13150 older ones might be better, close any circuits pending on that
13151 new entry guard connection. This fix should make us recover much
13152 faster when our network is down and then comes back. Bugfix on
13153 0.1.2.8-beta; found by lodger.
13155 o Memory fixes and improvements:
13156 - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
13157 to avoid unused RAM in buffer chunks and memory pools.
13158 - Speed up parsing and cut down on memory fragmentation by using
13159 stack-style allocations for parsing directory objects. Previously,
13160 this accounted for over 40% of allocations from within Tor's code
13161 on a typical directory cache.
13162 - Use a Bloom filter rather than a digest-based set to track which
13163 descriptors we need to keep around when we're cleaning out old
13164 router descriptors. This speeds up the computation significantly,
13165 and may reduce fragmentation.
13166 - Reduce the default smartlist size from 32 to 16; it turns out that
13167 most smartlists hold around 8-12 elements tops.
13168 - Make dumpstats() log the fullness and size of openssl-internal
13170 - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
13171 patch to their OpenSSL, turn it on to save memory on servers. This
13172 patch will (with any luck) get included in a mainline distribution
13174 - Never use OpenSSL compression: it wastes RAM and CPU trying to
13175 compress cells, which are basically all encrypted, compressed,
13179 - Stop reloading the router list from disk for no reason when we
13180 run out of reachable directory mirrors. Once upon a time reloading
13181 it would set the 'is_running' flag back to 1 for them. It hasn't
13182 done that for a long time.
13183 - In very rare situations new hidden service descriptors were
13184 published earlier than 30 seconds after the last change to the
13185 service. (We currently think that a hidden service descriptor
13186 that's been stable for 30 seconds is worth publishing.)
13189 - Allow separate log levels to be configured for different logging
13190 domains. For example, this allows one to log all notices, warnings,
13191 or errors, plus all memory management messages of level debug or
13192 higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
13193 - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
13194 and stop using a warning that had become unfixably verbose under
13196 - New --hush command-line option similar to --quiet. While --quiet
13197 disables all logging to the console on startup, --hush limits the
13198 output to messages of warning and error severity.
13199 - Servers support a new URL scheme for consensus downloads that
13200 allows the client to specify which authorities are trusted.
13201 The server then only sends the consensus if the client will trust
13202 it. Otherwise a 404 error is sent back. Clients use this
13203 new scheme when the server supports it (meaning it's running
13204 0.2.1.1-alpha or later). Implements proposal 134.
13205 - New configure/torrc options (--enable-geoip-stats,
13206 DirRecordUsageByCountry) to record how many IPs we've served
13207 directory info to in each country code, how many status documents
13208 total we've sent to each country code, and what share of the total
13209 directory requests we should expect to see.
13210 - Use the TLS1 hostname extension to more closely resemble browser
13212 - Lots of new unit tests.
13213 - Add a macro to implement the common pattern of iterating through
13214 two parallel lists in lockstep.
13217 Changes in version 0.2.0.28-rc - 2008-06-13
13218 Tor 0.2.0.28-rc fixes an anonymity-related bug, fixes a hidden-service
13219 performance bug, and fixes a bunch of smaller bugs.
13222 - Fix a bug where, when we were choosing the 'end stream reason' to
13223 put in our relay end cell that we send to the exit relay, Tor
13224 clients on Windows were sometimes sending the wrong 'reason'. The
13225 anonymity problem is that exit relays may be able to guess whether
13226 the client is running Windows, thus helping partition the anonymity
13227 set. Down the road we should stop sending reasons to exit relays,
13228 or otherwise prevent future versions of this bug.
13231 - While setting up a hidden service, some valid introduction circuits
13232 were overlooked and abandoned. This might be the reason for
13233 the long delay in making a hidden service available. Bugfix on
13237 - Update to the "June 9 2008" ip-to-country file.
13238 - Run 'make test' as part of 'make dist', so we stop releasing so
13239 many development snapshots that fail their unit tests.
13242 - When we're checking if we have enough dir info for each relay
13243 to begin establishing circuits, make sure that we actually have
13244 the descriptor listed in the consensus, not just any descriptor.
13246 - Bridge relays no longer print "xx=0" in their extrainfo document
13247 for every single country code in the geoip db. Bugfix on
13249 - Only warn when we fail to load the geoip file if we were planning to
13250 include geoip stats in our extrainfo document. Bugfix on 0.2.0.27-rc.
13251 - If we change our MaxAdvertisedBandwidth and then reload torrc,
13252 Tor won't realize it should publish a new relay descriptor. Fixes
13253 bug 688, reported by mfr. Bugfix on 0.1.2.x.
13254 - When we haven't had any application requests lately, don't bother
13255 logging that we have expired a bunch of descriptors. Bugfix
13257 - Make relay cells written on a connection count as non-padding when
13258 tracking how long a connection has been in use. Bugfix on
13259 0.2.0.1-alpha. Spotted by lodger.
13260 - Fix unit tests in 0.2.0.27-rc.
13261 - Fix compile on Windows.
13264 Changes in version 0.2.0.27-rc - 2008-06-03
13265 Tor 0.2.0.27-rc adds a few features we left out of the earlier
13266 release candidates. In particular, we now include an IP-to-country
13267 GeoIP database, so controllers can easily look up what country a
13268 given relay is in, and so bridge relays can give us some sanitized
13269 summaries about which countries are making use of bridges. (See proposal
13270 126-geoip-fetching.txt for details.)
13273 - Include an IP-to-country GeoIP file in the tarball, so bridge
13274 relays can report sanitized summaries of the usage they're seeing.
13277 - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
13278 Robert Hogan. Fixes the first part of bug 681.
13279 - Make bridge authorities never serve extrainfo docs.
13280 - Add support to detect Libevent versions in the 1.4.x series
13282 - Fix build on gcc 4.3 with --enable-gcc-warnings set.
13283 - Include a new contrib/tor-exit-notice.html file that exit relay
13284 operators can put on their website to help reduce abuse queries.
13287 - When tunneling an encrypted directory connection, and its first
13288 circuit fails, do not leave it unattached and ask the controller
13289 to deal. Fixes the second part of bug 681.
13290 - Make bridge authorities correctly expire old extrainfo documents
13294 Changes in version 0.2.0.26-rc - 2008-05-13
13295 Tor 0.2.0.26-rc fixes a major security vulnerability caused by a bug
13296 in Debian's OpenSSL packages. All users running any 0.2.0.x version
13297 should upgrade, whether they're running Debian or not.
13299 o Major security fixes:
13300 - Use new V3 directory authority keys on the tor26, gabelmoo, and
13301 moria1 V3 directory authorities. The old keys were generated with
13302 a vulnerable version of Debian's OpenSSL package, and must be
13303 considered compromised. Other authorities' keys were not generated
13304 with an affected version of OpenSSL.
13307 - List authority signatures as "unrecognized" based on DirServer
13308 lines, not on cert cache. Bugfix on 0.2.0.x.
13311 - Add a new V3AuthUseLegacyKey option to make it easier for
13312 authorities to change their identity keys if they have to.
13315 Changes in version 0.2.0.25-rc - 2008-04-23
13316 Tor 0.2.0.25-rc makes Tor work again on OS X and certain BSDs.
13319 - Remember to initialize threading before initializing logging.
13320 Otherwise, many BSD-family implementations will crash hard on
13321 startup. Fixes bug 671. Bugfix on 0.2.0.24-rc.
13324 - Authorities correctly free policies on bad servers on
13325 exit. Fixes bug 672. Bugfix on 0.2.0.x.
13328 Changes in version 0.2.0.24-rc - 2008-04-22
13329 Tor 0.2.0.24-rc adds dizum (run by Alex de Joode) as the new sixth
13330 v3 directory authority, makes relays with dynamic IP addresses and no
13331 DirPort notice more quickly when their IP address changes, fixes a few
13332 rare crashes and memory leaks, and fixes a few other miscellaneous bugs.
13334 o New directory authorities:
13335 - Take lefkada out of the list of v3 directory authorities, since
13336 it has been down for months.
13337 - Set up dizum (run by Alex de Joode) as the new sixth v3 directory
13341 - Detect address changes more quickly on non-directory mirror
13342 relays. Bugfix on 0.2.0.18-alpha; fixes bug 652.
13344 o Minor features (security):
13345 - Reject requests for reverse-dns lookup of names that are in
13346 a private address space. Patch from lodger.
13347 - Non-exit relays no longer allow DNS requests. Fixes bug 619. Patch
13350 o Minor bugfixes (crashes):
13351 - Avoid a rare assert that can trigger when Tor doesn't have much
13352 directory information yet and it tries to fetch a v2 hidden
13353 service descriptor. Fixes bug 651, reported by nwf.
13354 - Initialize log mutex before initializing dmalloc. Otherwise,
13355 running with dmalloc would crash. Bugfix on 0.2.0.x-alpha.
13356 - Use recursive pthread mutexes in order to avoid deadlock when
13357 logging debug-level messages to a controller. Bug spotted by nwf,
13358 bugfix on 0.2.0.16-alpha.
13360 o Minor bugfixes (resource management):
13361 - Keep address policies from leaking memory: start their refcount
13362 at 1, not 2. Bugfix on 0.2.0.16-alpha.
13363 - Free authority certificates on exit, so they don't look like memory
13364 leaks. Bugfix on 0.2.0.19-alpha.
13365 - Free static hashtables for policy maps and for TLS connections on
13366 shutdown, so they don't look like memory leaks. Bugfix on 0.2.0.x.
13367 - Avoid allocating extra space when computing consensuses on 64-bit
13368 platforms. Bug spotted by aakova.
13370 o Minor bugfixes (misc):
13371 - Do not read the configuration file when we've only been told to
13372 generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
13373 based on patch from Sebastian Hahn.
13374 - Exit relays that are used as a client can now reach themselves
13375 using the .exit notation, rather than just launching an infinite
13376 pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
13377 - When attempting to open a logfile fails, tell us why.
13378 - Fix a dumb bug that was preventing us from knowing that we should
13379 preemptively build circuits to handle expected directory requests.
13380 Fixes bug 660. Bugfix on 0.1.2.x.
13381 - Warn less verbosely about clock skew from netinfo cells from
13382 untrusted sources. Fixes bug 663.
13383 - Make controller stream events for DNS requests more consistent,
13384 by adding "new stream" events for DNS requests, and removing
13385 spurious "stream closed" events" for cached reverse resolves.
13386 Patch from mwenge. Fixes bug 646.
13387 - Correctly notify one-hop connections when a circuit build has
13388 failed. Possible fix for bug 669. Found by lodger.
13391 Changes in version 0.2.0.23-rc - 2008-03-24
13392 Tor 0.2.0.23-rc is the fourth release candidate for the 0.2.0 series. It
13393 makes bootstrapping faster if the first directory mirror you contact
13394 is down. The bundles also include the new Vidalia 0.1.2 release.
13397 - When a tunneled directory request is made to a directory server
13398 that's down, notice after 30 seconds rather than 120 seconds. Also,
13399 fail any begindir streams that are pending on it, so they can
13400 retry elsewhere. This was causing multi-minute delays on bootstrap.
13403 Changes in version 0.2.0.22-rc - 2008-03-18
13404 Tor 0.2.0.22-rc is the third release candidate for the 0.2.0 series. It
13405 enables encrypted directory connections by default for non-relays, fixes
13406 some broken TLS behavior we added in 0.2.0.20-rc, and resolves many
13407 other bugs. The bundles also include Vidalia 0.1.1 and Torbutton 1.1.17.
13410 - Enable encrypted directory connections by default for non-relays,
13411 so censor tools that block Tor directory connections based on their
13412 plaintext patterns will no longer work. This means Tor works in
13413 certain censored countries by default again.
13416 - Make sure servers always request certificates from clients during
13417 TLS renegotiation. Reported by lodger; bugfix on 0.2.0.20-rc.
13418 - Do not enter a CPU-eating loop when a connection is closed in
13419 the middle of client-side TLS renegotiation. Fixes bug 622. Bug
13420 diagnosed by lodger; bugfix on 0.2.0.20-rc.
13421 - Fix assertion failure that could occur when a blocked circuit
13422 became unblocked, and it had pending client DNS requests. Bugfix
13423 on 0.2.0.1-alpha. Fixes bug 632.
13425 o Minor bugfixes (on 0.1.2.x):
13426 - Generate "STATUS_SERVER" events rather than misspelled
13427 "STATUS_SEVER" events. Caught by mwenge.
13428 - When counting the number of bytes written on a TLS connection,
13429 look at the BIO actually used for writing to the network, not
13430 at the BIO used (sometimes) to buffer data for the network.
13431 Looking at different BIOs could result in write counts on the
13432 order of ULONG_MAX. Fixes bug 614.
13433 - On Windows, correctly detect errors when listing the contents of
13434 a directory. Fix from lodger.
13436 o Minor bugfixes (on 0.2.0.x):
13437 - Downgrade "sslv3 alert handshake failure" message to INFO.
13438 - If we set RelayBandwidthRate and RelayBandwidthBurst very high but
13439 left BandwidthRate and BandwidthBurst at the default, we would be
13440 silently limited by those defaults. Now raise them to match the
13441 RelayBandwidth* values.
13442 - Fix the SVK version detection logic to work correctly on a branch.
13443 - Make --enable-openbsd-malloc work correctly on Linux with alpha
13444 CPUs. Fixes bug 625.
13445 - Logging functions now check that the passed severity is sane.
13446 - Use proper log levels in the testsuite call of
13447 get_interface_address6().
13448 - When using a nonstandard malloc, do not use the platform values for
13449 HAVE_MALLOC_GOOD_SIZE or HAVE_MALLOC_USABLE_SIZE.
13450 - Make the openbsd malloc code use 8k pages on alpha CPUs and
13452 - Detect mismatched page sizes when using --enable-openbsd-malloc.
13453 - Avoid double-marked-for-close warning when certain kinds of invalid
13454 .in-addr.arpa addresses are passed to the DNSPort. Part of a fix
13455 for bug 617. Bugfix on 0.2.0.1-alpha.
13456 - Make sure that the "NULL-means-reject *:*" convention is followed by
13457 all the policy manipulation functions, avoiding some possible crash
13458 bugs. Bug found by lodger. Bugfix on 0.2.0.16-alpha.
13459 - Fix the implementation of ClientDNSRejectInternalAddresses so that it
13460 actually works, and doesn't warn about every single reverse lookup.
13461 Fixes the other part of bug 617. Bugfix on 0.2.0.1-alpha.
13464 - Only log guard node status when guard node status has changed.
13465 - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
13466 make "INFO" 75% less verbose.
13469 Changes in version 0.2.0.21-rc - 2008-03-02
13470 Tor 0.2.0.21-rc is the second release candidate for the 0.2.0 series. It
13471 makes Tor work well with Vidalia again, fixes a rare assert bug,
13472 and fixes a pair of more minor bugs. The bundles also include Vidalia
13473 0.1.0 and Torbutton 1.1.16.
13476 - The control port should declare that it requires password auth
13477 when HashedControlSessionPassword is set too. Patch from Matt Edman;
13478 bugfix on 0.2.0.20-rc. Fixes bug 615.
13479 - Downgrade assert in connection_buckets_decrement() to a log message.
13480 This may help us solve bug 614, and in any case will make its
13481 symptoms less severe. Bugfix on 0.2.0.20-rc. Reported by fredzupy.
13482 - We were sometimes miscounting the number of bytes read from the
13483 network, causing our rate limiting to not be followed exactly.
13484 Bugfix on 0.2.0.16-alpha. Reported by lodger.
13487 - Fix compilation with OpenSSL 0.9.8 and 0.9.8a. All other supported
13488 OpenSSL versions should have been working fine. Diagnosis and patch
13489 from lodger, Karsten Loesing, and Sebastian Hahn. Fixes bug 616.
13490 Bugfix on 0.2.0.20-rc.
13493 Changes in version 0.2.0.20-rc - 2008-02-24
13494 Tor 0.2.0.20-rc is the first release candidate for the 0.2.0 series. It
13495 makes more progress towards normalizing Tor's TLS handshake, makes
13496 hidden services work better again, helps relays bootstrap if they don't
13497 know their IP address, adds optional support for linking in openbsd's
13498 allocator or tcmalloc, allows really fast relays to scale past 15000
13499 sockets, and fixes a bunch of minor bugs reported by Veracode.
13502 - Enable the revised TLS handshake based on the one designed by
13503 Steven Murdoch in proposal 124, as revised in proposal 130. It
13504 includes version negotiation for OR connections as described in
13505 proposal 105. The new handshake is meant to be harder for censors
13506 to fingerprint, and it adds the ability to detect certain kinds of
13507 man-in-the-middle traffic analysis attacks. The version negotiation
13508 feature will allow us to improve Tor's link protocol more safely
13510 - Choose which bridge to use proportional to its advertised bandwidth,
13511 rather than uniformly at random. This should speed up Tor for
13512 bridge users. Also do this for people who set StrictEntryNodes.
13513 - When a TrackHostExits-chosen exit fails too many times in a row,
13514 stop using it. Bugfix on 0.1.2.x; fixes bug 437.
13517 - Resolved problems with (re-)fetching hidden service descriptors.
13518 Patch from Karsten Loesing; fixes problems with 0.2.0.18-alpha
13519 and 0.2.0.19-alpha.
13520 - If we only ever used Tor for hidden service lookups or posts, we
13521 would stop building circuits and start refusing connections after
13522 24 hours, since we falsely believed that Tor was dormant. Reported
13523 by nwf; bugfix on 0.1.2.x.
13524 - Servers that don't know their own IP address should go to the
13525 authorities for their first directory fetch, even if their DirPort
13526 is off or if they don't know they're reachable yet. This will help
13527 them bootstrap better. Bugfix on 0.2.0.18-alpha; fixes bug 609.
13528 - When counting the number of open sockets, count not only the number
13529 of sockets we have received from the socket() call, but also
13530 the number we've gotten from accept() and socketpair(). This bug
13531 made us fail to count all sockets that we were using for incoming
13532 connections. Bugfix on 0.2.0.x.
13533 - Fix code used to find strings within buffers, when those strings
13534 are not in the first chunk of the buffer. Bugfix on 0.2.0.x.
13535 - Fix potential segfault when parsing HTTP headers. Bugfix on 0.2.0.x.
13536 - Add a new __HashedControlSessionPassword option for controllers
13537 to use for one-off session password hashes that shouldn't get
13538 saved to disk by SAVECONF --- Vidalia users were accumulating a
13539 pile of HashedControlPassword lines in their torrc files, one for
13540 each time they had restarted Tor and then clicked Save. Make Tor
13541 automatically convert "HashedControlPassword" to this new option but
13542 only when it's given on the command line. Partial fix for bug 586.
13544 o Minor features (performance):
13545 - Tune parameters for cell pool allocation to minimize amount of
13547 - Add OpenBSD malloc code from phk as an optional malloc
13548 replacement on Linux: some glibc libraries do very poorly
13549 with Tor's memory allocation patterns. Pass
13550 --enable-openbsd-malloc to get the replacement malloc code.
13551 - Add a --with-tcmalloc option to the configure script to link
13552 against tcmalloc (if present). Does not yet search for
13553 non-system include paths.
13554 - Stop imposing an arbitrary maximum on the number of file descriptors
13555 used for busy servers. Bug reported by Olaf Selke; patch from
13558 o Minor features (other):
13559 - When SafeLogging is disabled, log addresses along with all TLS
13561 - When building with --enable-gcc-warnings, check for whether Apple's
13562 warning "-Wshorten-64-to-32" is available.
13563 - Add a --passphrase-fd argument to the tor-gencert command for
13566 o Minor bugfixes (memory leaks and code problems):
13567 - We were leaking a file descriptor if Tor started with a zero-length
13568 cached-descriptors file. Patch by freddy77; bugfix on 0.1.2.
13569 - Detect size overflow in zlib code. Reported by Justin Ferguson and
13571 - We were comparing the raw BridgePassword entry with a base64'ed
13572 version of it, when handling a "/tor/networkstatus-bridges"
13573 directory request. Now compare correctly. Noticed by Veracode.
13574 - Recover from bad tracked-since value in MTBF-history file.
13575 Should fix bug 537.
13576 - Alter the code that tries to recover from unhandled write
13577 errors, to not try to flush onto a socket that's given us
13578 unhandled errors. Bugfix on 0.1.2.x.
13579 - Make Unix controlsockets work correctly on OpenBSD. Patch from
13580 tup. Bugfix on 0.2.0.3-alpha.
13582 o Minor bugfixes (other):
13583 - If we have an extra-info document for our server, always make
13584 it available on the control port, even if we haven't gotten
13585 a copy of it from an authority yet. Patch from mwenge.
13586 - Log the correct memory chunk sizes for empty RAM chunks in mempool.c.
13587 - Directory mirrors no longer include a guess at the client's IP
13588 address if the connection appears to be coming from the same /24
13589 network; it was producing too many wrong guesses.
13590 - Make the new hidden service code respect the SafeLogging setting.
13591 Bugfix on 0.2.0.x. Patch from Karsten.
13592 - When starting as an authority, do not overwrite all certificates
13593 cached from other authorities. Bugfix on 0.2.0.x. Fixes bug 606.
13594 - If we're trying to flush the last bytes on a connection (for
13595 example, when answering a directory request), reset the
13596 time-to-give-up timeout every time we manage to write something
13597 on the socket. Bugfix on 0.1.2.x.
13598 - Change the behavior of "getinfo status/good-server-descriptor"
13599 so it doesn't return failure when any authority disappears.
13600 - Even though the man page said that "TrackHostExits ." should
13601 work, nobody had ever implemented it. Bugfix on 0.1.0.x.
13602 - Report TLS "zero return" case as a "clean close" and "IO error"
13603 as a "close". Stop calling closes "unexpected closes": existing
13604 Tors don't use SSL_close(), so having a connection close without
13605 the TLS shutdown handshake is hardly unexpected.
13606 - Send NAMESERVER_STATUS messages for a single failed nameserver
13609 o Code simplifications and refactoring:
13610 - Remove the tor_strpartition function: its logic was confused,
13611 and it was only used for one thing that could be implemented far
13615 Changes in version 0.2.0.19-alpha - 2008-02-09
13616 Tor 0.2.0.19-alpha makes more progress towards normalizing Tor's TLS
13617 handshake, makes path selection for relays more secure and IP address
13618 guessing more robust, and generally fixes a lot of bugs in preparation
13619 for calling the 0.2.0 branch stable.
13622 - Do not include recognizeable strings in the commonname part of
13623 Tor's x509 certificates.
13626 - If we're a relay, avoid picking ourselves as an introduction point,
13627 a rendezvous point, or as the final hop for internal circuits. Bug
13628 reported by taranis and lodger. Bugfix on 0.1.2.x.
13629 - Patch from "Andrew S. Lists" to catch when we contact a directory
13630 mirror at IP address X and he says we look like we're coming from
13631 IP address X. Bugfix on 0.1.2.x.
13633 o Minor features (security):
13634 - Be more paranoid about overwriting sensitive memory on free(),
13635 as a defensive programming tactic to ensure forward secrecy.
13637 o Minor features (directory authority):
13638 - Actually validate the options passed to AuthDirReject,
13639 AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
13640 - Reject router descriptors with out-of-range bandwidthcapacity or
13641 bandwidthburst values.
13643 o Minor features (controller):
13644 - Reject controller commands over 1MB in length. This keeps rogue
13645 processes from running us out of memory.
13647 o Minor features (misc):
13648 - Give more descriptive well-formedness errors for out-of-range
13649 hidden service descriptor/protocol versions.
13650 - Make memory debugging information describe more about history
13651 of cell allocation, so we can help reduce our memory use.
13653 o Deprecated features (controller):
13654 - The status/version/num-versioning and status/version/num-concurring
13655 GETINFO options are no longer useful in the v3 directory protocol:
13656 treat them as deprecated, and warn when they're used.
13659 - When our consensus networkstatus has been expired for a while, stop
13660 being willing to build circuits using it. Fixes bug 401. Bugfix
13662 - Directory caches now fetch certificates from all authorities
13663 listed in a networkstatus consensus, even when they do not
13664 recognize them. Fixes bug 571. Bugfix on 0.2.0.x.
13665 - When connecting to a bridge without specifying its key, insert
13666 the connection into the identity-to-connection map as soon as
13667 a key is learned. Fixes bug 574. Bugfix on 0.2.0.x.
13668 - Detect versions of OS X where malloc_good_size() is present in the
13669 library but never actually declared. Resolves bug 587. Bugfix
13671 - Stop incorrectly truncating zlib responses to directory authority
13672 signature download requests. Fixes bug 593. Bugfix on 0.2.0.x.
13673 - Stop recommending that every server operator send mail to tor-ops.
13674 Resolves bug 597. Bugfix on 0.1.2.x.
13675 - Don't trigger an assert if we start a directory authority with a
13676 private IP address (like 127.0.0.1).
13677 - Avoid possible failures when generating a directory with routers
13678 with over-long versions strings, or too many flags set. Bugfix
13680 - If an attempt to launch a DNS resolve request over the control
13681 port fails because we have overrun the limit on the number of
13682 connections, tell the controller that the request has failed.
13683 - Avoid using too little bandwidth when our clock skips a few
13684 seconds. Bugfix on 0.1.2.x.
13685 - Fix shell error when warning about missing packages in configure
13686 script, on Fedora or Red Hat machines. Bugfix on 0.2.0.x.
13687 - Do not become confused when receiving a spurious VERSIONS-like
13688 cell from a confused v1 client. Bugfix on 0.2.0.x.
13689 - Re-fetch v2 (as well as v0) rendezvous descriptors when all
13690 introduction points for a hidden service have failed. Patch from
13691 Karsten Loesing. Bugfix on 0.2.0.x.
13693 o Code simplifications and refactoring:
13694 - Remove some needless generality from cpuworker code, for improved
13696 - Stop overloading the circuit_t.onionskin field for both "onionskin
13697 from a CREATE cell that we are waiting for a cpuworker to be
13698 assigned" and "onionskin from an EXTEND cell that we are going to
13699 send to an OR as soon as we are connected". Might help with bug 600.
13700 - Add an in-place version of aes_crypt() so that we can avoid doing a
13701 needless memcpy() call on each cell payload.
13704 Changes in version 0.2.0.18-alpha - 2008-01-25
13705 Tor 0.2.0.18-alpha adds a sixth v3 directory authority run by CCC,
13706 fixes a big memory leak in 0.2.0.17-alpha, and adds new config options
13707 that can warn or reject connections to ports generally associated with
13708 vulnerable-plaintext protocols.
13710 o New directory authorities:
13711 - Set up dannenberg (run by CCC) as the sixth v3 directory
13715 - Fix a major memory leak when attempting to use the v2 TLS
13716 handshake code. Bugfix on 0.2.0.x; fixes bug 589.
13717 - We accidentally enabled the under-development v2 TLS handshake
13718 code, which was causing log entries like "TLS error while
13719 renegotiating handshake". Disable it again. Resolves bug 590.
13720 - We were computing the wrong Content-Length: header for directory
13721 responses that need to be compressed on the fly, causing clients
13722 asking for those items to always fail. Bugfix on 0.2.0.x; partially
13726 - Avoid going directly to the directory authorities even if you're a
13727 relay, if you haven't found yourself reachable yet or if you've
13728 decided not to advertise your dirport yet. Addresses bug 556.
13729 - If we've gone 12 hours since our last bandwidth check, and we
13730 estimate we have less than 50KB bandwidth capacity but we could
13731 handle more, do another bandwidth test.
13732 - New config options WarnPlaintextPorts and RejectPlaintextPorts so
13733 Tor can warn and/or refuse connections to ports commonly used with
13734 vulnerable-plaintext protocols. Currently we warn on ports 23,
13735 109, 110, and 143, but we don't reject any.
13738 - When we setconf ClientOnly to 1, close any current OR and Dir
13739 listeners. Reported by mwenge.
13740 - When we get a consensus that's been signed by more people than
13741 we expect, don't log about it; it's not a big deal. Reported
13745 - Don't answer "/tor/networkstatus-bridges" directory requests if
13746 the request isn't encrypted.
13747 - Make "ClientOnly 1" config option disable directory ports too.
13748 - Patches from Karsten Loesing to make v2 hidden services more
13749 robust: work even when there aren't enough HSDir relays available;
13750 retry when a v2 rend desc fetch fails; but don't retry if we
13751 already have a usable v0 rend desc.
13754 Changes in version 0.2.0.17-alpha - 2008-01-17
13755 Tor 0.2.0.17-alpha makes the tarball build cleanly again (whoops).
13758 - Make the tor-gencert man page get included correctly in the tarball.
13761 Changes in version 0.2.0.16-alpha - 2008-01-17
13762 Tor 0.2.0.16-alpha adds a fifth v3 directory authority run by Karsten
13763 Loesing, and generally cleans up a lot of features and minor bugs.
13765 o New directory authorities:
13766 - Set up gabelmoo (run by Karsten Loesing) as the fifth v3 directory
13769 o Major performance improvements:
13770 - Switch our old ring buffer implementation for one more like that
13771 used by free Unix kernels. The wasted space in a buffer with 1mb
13772 of data will now be more like 8k than 1mb. The new implementation
13773 also avoids realloc();realloc(); patterns that can contribute to
13774 memory fragmentation.
13777 - Configuration files now accept C-style strings as values. This
13778 helps encode characters not allowed in the current configuration
13779 file format, such as newline or #. Addresses bug 557.
13780 - Although we fixed bug 539 (where servers would send HTTP status 503
13781 responses _and_ send a body too), there are still servers out
13782 there that haven't upgraded. Therefore, make clients parse such
13783 bodies when they receive them.
13784 - When we're not serving v2 directory information, there is no reason
13785 to actually keep any around. Remove the obsolete files and directory
13786 on startup if they are very old and we aren't going to serve them.
13788 o Minor performance improvements:
13789 - Reference-count and share copies of address policy entries; only 5%
13790 of them were actually distinct.
13791 - Never walk through the list of logs if we know that no log is
13792 interested in a given message.
13795 - When an authority has not signed a consensus, do not try to
13796 download a nonexistent "certificate with key 00000000". Bugfix
13797 on 0.2.0.x. Fixes bug 569.
13798 - Fix a rare assert error when we're closing one of our threads:
13799 use a mutex to protect the list of logs, so we never write to the
13800 list as it's being freed. Bugfix on 0.1.2.x. Fixes the very rare
13801 bug 575, which is kind of the revenge of bug 222.
13802 - Patch from Karsten Loesing to complain less at both the client
13803 and the relay when a relay used to have the HSDir flag but doesn't
13804 anymore, and we try to upload a hidden service descriptor.
13805 - Stop leaking one cert per TLS context. Fixes bug 582. Bugfix on
13807 - Do not try to download missing certificates until we have tried
13808 to check our fallback consensus. Fixes bug 583.
13809 - Make bridges round reported GeoIP stats info up to the nearest
13810 estimate, not down. Now we can distinguish between "0 people from
13811 this country" and "1 person from this country".
13812 - Avoid a spurious free on base64 failure. Bugfix on 0.1.2.
13813 - Avoid possible segfault if key generation fails in
13814 crypto_pk_hybrid_encrypt. Bugfix on 0.2.0.
13815 - Avoid segfault in the case where a badly behaved v2 versioning
13816 directory sends a signed networkstatus with missing client-versions.
13818 - Avoid segfaults on certain complex invocations of
13819 router_get_by_hexdigest(). Bugfix on 0.1.2.
13820 - Correct bad index on array access in parse_http_time(). Bugfix
13822 - Fix possible bug in vote generation when server versions are present
13823 but client versions are not.
13824 - Fix rare bug on REDIRECTSTREAM control command when called with no
13825 port set: it could erroneously report an error when none had
13827 - Avoid bogus crash-prone, leak-prone tor_realloc when we're
13828 compressing large objects and find ourselves with more than 4k
13829 left over. Bugfix on 0.2.0.
13830 - Fix a small memory leak when setting up a hidden service.
13831 - Fix a few memory leaks that could in theory happen under bizarre
13833 - Fix an assert if we post a general-purpose descriptor via the
13834 control port but that descriptor isn't mentioned in our current
13835 network consensus. Bug reported by Jon McLachlan; bugfix on
13838 o Minor features (controller):
13839 - Get NS events working again. Patch from tup.
13840 - The GETCONF command now escapes and quotes configuration values
13841 that don't otherwise fit into the torrc file.
13842 - The SETCONF command now handles quoted values correctly.
13844 o Minor features (directory authorities):
13845 - New configuration options to override default maximum number of
13846 servers allowed on a single IP address. This is important for
13847 running a test network on a single host.
13848 - Actually implement the -s option to tor-gencert.
13849 - Add a manual page for tor-gencert.
13851 o Minor features (bridges):
13852 - Bridge authorities no longer serve bridge descriptors over
13853 unencrypted connections.
13855 o Minor features (other):
13856 - Add hidden services and DNSPorts to the list of things that make
13857 Tor accept that it has running ports. Change starting Tor with no
13858 ports from a fatal error to a warning; we might change it back if
13859 this turns out to confuse anybody. Fixes bug 579.
13862 Changes in version 0.1.2.19 - 2008-01-17
13863 Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
13864 exit policy a little bit more conservative so it's safer to run an
13865 exit relay on a home system, and fixes a variety of smaller issues.
13868 - Exit policies now reject connections that are addressed to a
13869 relay's public (external) IP address too, unless
13870 ExitPolicyRejectPrivate is turned off. We do this because too
13871 many relays are running nearby to services that trust them based
13872 on network address.
13875 - When the clock jumps forward a lot, do not allow the bandwidth
13876 buckets to become negative. Fixes bug 544.
13877 - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
13878 on every successful resolve. Reported by Mike Perry.
13879 - Purge old entries from the "rephist" database and the hidden
13880 service descriptor database even when DirPort is zero.
13881 - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
13882 requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
13883 crashing or mis-answering these requests.
13884 - When we decide to send a 503 response to a request for servers, do
13885 not then also send the server descriptors: this defeats the whole
13886 purpose. Fixes bug 539.
13889 - Changing the ExitPolicyRejectPrivate setting should cause us to
13890 rebuild our server descriptor.
13891 - Fix handling of hex nicknames when answering controller requests for
13892 networkstatus by name, or when deciding whether to warn about
13893 unknown routers in a config option. (Patch from mwenge.)
13894 - Fix a couple of hard-to-trigger autoconf problems that could result
13895 in really weird results on platforms whose sys/types.h files define
13896 nonstandard integer types.
13897 - Don't try to create the datadir when running --verify-config or
13898 --hash-password. Resolves bug 540.
13899 - If we were having problems getting a particular descriptor from the
13900 directory caches, and then we learned about a new descriptor for
13901 that router, we weren't resetting our failure count. Reported
13903 - Although we fixed bug 539 (where servers would send HTTP status 503
13904 responses _and_ send a body too), there are still servers out there
13905 that haven't upgraded. Therefore, make clients parse such bodies
13906 when they receive them.
13907 - Run correctly on systems where rlim_t is larger than unsigned long.
13908 This includes some 64-bit systems.
13909 - Run correctly on platforms (like some versions of OS X 10.5) where
13910 the real limit for number of open files is OPEN_FILES, not rlim_max
13911 from getrlimit(RLIMIT_NOFILES).
13912 - Avoid a spurious free on base64 failure.
13913 - Avoid segfaults on certain complex invocations of
13914 router_get_by_hexdigest().
13915 - Fix rare bug on REDIRECTSTREAM control command when called with no
13916 port set: it could erroneously report an error when none had
13920 Changes in version 0.2.0.15-alpha - 2007-12-25
13921 Tor 0.2.0.14-alpha and 0.2.0.15-alpha fix a bunch of bugs with the
13922 features added in 0.2.0.13-alpha.
13925 - Fix several remotely triggerable asserts based on DirPort requests
13926 for a v2 or v3 networkstatus object before we were prepared. This
13927 was particularly bad for 0.2.0.13 and later bridge relays, who
13928 would never have a v2 networkstatus and would thus always crash
13929 when used. Bugfixes on 0.2.0.x.
13930 - Estimate the v3 networkstatus size more accurately, rather than
13931 estimating it at zero bytes and giving it artificially high priority
13932 compared to other directory requests. Bugfix on 0.2.0.x.
13935 - Fix configure.in logic for cross-compilation.
13936 - When we load a bridge descriptor from the cache, and it was
13937 previously unreachable, mark it as retriable so we won't just
13938 ignore it. Also, try fetching a new copy immediately. Bugfixes
13940 - The bridge GeoIP stats were counting other relays, for example
13941 self-reachability and authority-reachability tests.
13944 - Support compilation to target iPhone; patch from cjacker huang.
13945 To build for iPhone, pass the --enable-iphone option to configure.
13948 Changes in version 0.2.0.14-alpha - 2007-12-23
13950 - Fix a crash on startup if you install Tor 0.2.0.13-alpha fresh
13951 without a datadirectory from a previous Tor install. Reported
13953 - Fix a crash when we fetch a descriptor that turns out to be
13954 unexpected (it used to be in our networkstatus when we started
13955 fetching it, but it isn't in our current networkstatus), and we
13956 aren't using bridges. Bugfix on 0.2.0.x.
13957 - Fix a crash when accessing hidden services: it would work the first
13958 time you use a given introduction point for your service, but
13959 on subsequent requests we'd be using garbage memory. Fixed by
13960 Karsten Loesing. Bugfix on 0.2.0.13-alpha.
13961 - Fix a crash when we load a bridge descriptor from disk but we don't
13962 currently have a Bridge line for it in our torrc. Bugfix on
13966 - If bridge authorities set BridgePassword, they will serve a
13967 snapshot of known bridge routerstatuses from their DirPort to
13968 anybody who knows that password. Unset by default.
13971 - Make the unit tests build again.
13972 - Make "GETINFO/desc-annotations/id/<OR digest>" actually work.
13973 - Make PublishServerDescriptor default to 1, so the default doesn't
13974 have to change as we invent new directory protocol versions.
13975 - Fix test for rlim_t on OSX 10.3: sys/resource.h doesn't want to
13976 be included unless sys/time.h is already included. Fixes
13977 bug 553. Bugfix on 0.2.0.x.
13978 - If we receive a general-purpose descriptor and then receive an
13979 identical bridge-purpose descriptor soon after, don't discard
13980 the next one as a duplicate.
13983 - If BridgeRelay is set to 1, then the default for
13984 PublishServerDescriptor is now "bridge" rather than "v2,v3".
13985 - If the user sets RelayBandwidthRate but doesn't set
13986 RelayBandwidthBurst, then make them equal rather than erroring out.
13989 Changes in version 0.2.0.13-alpha - 2007-12-21
13990 Tor 0.2.0.13-alpha adds a fourth v3 directory authority run by Geoff
13991 Goodell, fixes many more bugs, and adds a lot of infrastructure for
13994 o New directory authorities:
13995 - Set up lefkada (run by Geoff Goodell) as the fourth v3 directory
13999 - Only update guard status (usable / not usable) once we have
14000 enough directory information. This was causing us to always pick
14001 two new guards on startup (bugfix on 0.2.0.9-alpha), and it was
14002 causing us to discard all our guards on startup if we hadn't been
14003 running for a few weeks (bugfix on 0.1.2.x). Fixes bug 448.
14004 - Purge old entries from the "rephist" database and the hidden
14005 service descriptor databases even when DirPort is zero. Bugfix
14007 - We were ignoring our RelayBandwidthRate for the first 30 seconds
14008 after opening a circuit -- even a relayed circuit. Bugfix on
14010 - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
14011 requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
14012 crashing or mis-answering these types of requests.
14013 - Relays were publishing their server descriptor to v1 and v2
14014 directory authorities, but they didn't try publishing to v3-only
14015 authorities. Fix this; and also stop publishing to v1 authorities.
14017 - When we were reading router descriptors from cache, we were ignoring
14018 the annotations -- so for example we were reading in bridge-purpose
14019 descriptors as general-purpose descriptors. Bugfix on 0.2.0.8-alpha.
14020 - When we decided to send a 503 response to a request for servers, we
14021 were then also sending the server descriptors: this defeats the
14022 whole purpose. Fixes bug 539; bugfix on 0.1.2.x.
14025 - Bridge relays now behave like clients with respect to time
14026 intervals for downloading new consensus documents -- otherwise they
14027 stand out. Bridge users now wait until the end of the interval,
14028 so their bridge relay will be sure to have a new consensus document.
14029 - Three new config options (AlternateDirAuthority,
14030 AlternateBridgeAuthority, and AlternateHSAuthority) that let the
14031 user selectively replace the default directory authorities by type,
14032 rather than the all-or-nothing replacement that DirServer offers.
14033 - Tor can now be configured to read a GeoIP file from disk in one
14034 of two formats. This can be used by controllers to map IP addresses
14035 to countries. Eventually, it may support exit-by-country.
14036 - When possible, bridge relays remember which countries users
14037 are coming from, and report aggregate information in their
14038 extra-info documents, so that the bridge authorities can learn
14039 where Tor is blocked.
14040 - Bridge directory authorities now do reachability testing on the
14041 bridges they know. They provide router status summaries to the
14042 controller via "getinfo ns/purpose/bridge", and also dump summaries
14043 to a file periodically.
14044 - Stop fetching directory info so aggressively if your DirPort is
14045 on but your ORPort is off; stop fetching v2 dir info entirely.
14046 You can override these choices with the new FetchDirInfoEarly
14050 - The fix in 0.2.0.12-alpha cleared the "hsdir" flag in v3 network
14051 consensus documents when there are too many relays at a single
14052 IP address. Now clear it in v2 network status documents too, and
14053 also clear it in routerinfo_t when the relay is no longer listed
14054 in the relevant networkstatus document.
14055 - Don't crash if we get an unexpected value for the
14056 PublishServerDescriptor config option. Reported by Matt Edman;
14057 bugfix on 0.2.0.9-alpha.
14058 - Our new v2 hidden service descriptor format allows descriptors
14059 that have no introduction points. But Tor crashed when we tried
14060 to build a descriptor with no intro points (and it would have
14061 crashed if we had tried to parse one). Bugfix on 0.2.0.x; patch
14062 by Karsten Loesing.
14063 - Fix building with dmalloc 5.5.2 with glibc.
14064 - Reject uploaded descriptors and extrainfo documents if they're
14065 huge. Otherwise we'll cache them all over the network and it'll
14066 clog everything up. Reported by Aljosha Judmayer.
14067 - Check for presence of s6_addr16 and s6_addr32 fields in in6_addr
14068 via autoconf. Should fix compile on solaris. Bugfix on 0.2.0.x.
14069 - When the DANGEROUS_VERSION controller status event told us we're
14070 running an obsolete version, it used the string "OLD" to describe
14071 it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
14072 "OBSOLETE" in both cases. Bugfix on 0.1.2.x.
14073 - If we can't expand our list of entry guards (e.g. because we're
14074 using bridges or we have StrictEntryNodes set), don't mark relays
14075 down when they fail a directory request. Otherwise we're too quick
14076 to mark all our entry points down. Bugfix on 0.1.2.x.
14077 - Fix handling of hex nicknames when answering controller requests for
14078 networkstatus by name, or when deciding whether to warn about unknown
14079 routers in a config option. Bugfix on 0.1.2.x. (Patch from mwenge.)
14080 - Fix a couple of hard-to-trigger autoconf problems that could result
14081 in really weird results on platforms whose sys/types.h files define
14082 nonstandard integer types. Bugfix on 0.1.2.x.
14083 - Fix compilation with --disable-threads set. Bugfix on 0.2.0.x.
14084 - Don't crash on name lookup when we have no current consensus. Fixes
14085 bug 538; bugfix on 0.2.0.x.
14086 - Only Tors that want to mirror the v2 directory info should
14087 create the "cached-status" directory in their datadir. (All Tors
14088 used to create it.) Bugfix on 0.2.0.9-alpha.
14089 - Directory authorities should only automatically download Extra Info
14090 documents if they're v1, v2, or v3 authorities. Bugfix on 0.1.2.x.
14093 - On the USR1 signal, when dmalloc is in use, log the top 10 memory
14094 consumers. (We already do this on HUP.)
14095 - Authorities and caches fetch the v2 networkstatus documents
14096 less often, now that v3 is encouraged.
14097 - Add a new config option BridgeRelay that specifies you want to
14098 be a bridge relay. Right now the only difference is that it makes
14099 you answer begin_dir requests, and it makes you cache dir info,
14100 even if your DirPort isn't on.
14101 - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
14102 ask about source, timestamp of arrival, purpose, etc. We need
14103 something like this to help Vidalia not do GeoIP lookups on bridge
14105 - Allow multiple HashedControlPassword config lines, to support
14106 multiple controller passwords.
14107 - Authorities now decide whether they're authoritative for a given
14108 router based on the router's purpose.
14109 - New config options AuthDirBadDir and AuthDirListBadDirs for
14110 authorities to mark certain relays as "bad directories" in the
14111 networkstatus documents. Also supports the "!baddir" directive in
14112 the approved-routers file.
14115 Changes in version 0.2.0.12-alpha - 2007-11-16
14116 This twelfth development snapshot fixes some more build problems as
14117 well as a few minor bugs.
14120 - Make it build on OpenBSD again. Patch from tup.
14121 - Substitute BINDIR and LOCALSTATEDIR in scripts. Fixes
14122 package-building for Red Hat, OS X, etc.
14124 o Minor bugfixes (on 0.1.2.x):
14125 - Changing the ExitPolicyRejectPrivate setting should cause us to
14126 rebuild our server descriptor.
14128 o Minor bugfixes (on 0.2.0.x):
14129 - When we're lacking a consensus, don't try to perform rendezvous
14130 operations. Reported by Karsten Loesing.
14131 - Fix a small memory leak whenever we decide against using a
14132 newly picked entry guard. Reported by Mike Perry.
14133 - When authorities detected more than two relays running on the same
14134 IP address, they were clearing all the status flags but forgetting
14135 to clear the "hsdir" flag. So clients were being told that a
14136 given relay was the right choice for a v2 hsdir lookup, yet they
14137 never had its descriptor because it was marked as 'not running'
14139 - If we're trying to fetch a bridge descriptor and there's no way
14140 the bridge authority could help us (for example, we don't know
14141 a digest, or there is no bridge authority), don't be so eager to
14142 fall back to asking the bridge authority.
14143 - If we're using bridges or have strictentrynodes set, and our
14144 chosen exit is in the same family as all our bridges/entry guards,
14145 then be flexible about families.
14148 - When we negotiate a v2 link-layer connection (not yet implemented),
14149 accept RELAY_EARLY cells and turn them into RELAY cells if we've
14150 negotiated a v1 connection for their next step. Initial code for
14154 Changes in version 0.2.0.11-alpha - 2007-11-12
14155 This eleventh development snapshot fixes some build problems with
14156 the previous snapshot. It also includes a more secure-by-default exit
14157 policy for relays, fixes an enormous memory leak for exit relays, and
14158 fixes another bug where servers were falling out of the directory list.
14161 - Exit policies now reject connections that are addressed to a
14162 relay's public (external) IP address too, unless
14163 ExitPolicyRejectPrivate is turned off. We do this because too
14164 many relays are running nearby to services that trust them based
14165 on network address. Bugfix on 0.1.2.x.
14168 - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
14169 on every successful resolve. Reported by Mike Perry; bugfix
14171 - On authorities, never downgrade to old router descriptors simply
14172 because they're listed in the consensus. This created a catch-22
14173 where we wouldn't list a new descriptor because there was an
14174 old one in the consensus, and we couldn't get the new one in the
14175 consensus because we wouldn't list it. Possible fix for bug 548.
14176 Also, this might cause bug 543 to appear on authorities; if so,
14177 we'll need a band-aid for that. Bugfix on 0.2.0.9-alpha.
14179 o Packaging fixes on 0.2.0.10-alpha:
14180 - We were including instructions about what to do with the
14181 src/config/fallback-consensus file, but we weren't actually
14182 including it in the tarball. Disable all of that for now.
14185 - Allow people to say PreferTunnelledDirConns rather than
14186 PreferTunneledDirConns, for those alternate-spellers out there.
14189 - Don't reevaluate all the information from our consensus document
14190 just because we've downloaded a v2 networkstatus that we intend
14191 to cache. Fixes bug 545; bugfix on 0.2.0.x.
14194 Changes in version 0.2.0.10-alpha - 2007-11-10
14195 This tenth development snapshot adds a third v3 directory authority
14196 run by Mike Perry, adds most of Karsten Loesing's new hidden service
14197 descriptor format, fixes a bad crash bug and new bridge bugs introduced
14198 in 0.2.0.9-alpha, fixes many bugs with the v3 directory implementation,
14199 fixes some minor memory leaks in previous 0.2.0.x snapshots, and
14200 addresses many more minor issues.
14202 o New directory authorities:
14203 - Set up ides (run by Mike Perry) as the third v3 directory authority.
14206 - Allow tunnelled directory connections to ask for an encrypted
14207 "begin_dir" connection or an anonymized "uses a full Tor circuit"
14208 connection independently. Now we can make anonymized begin_dir
14209 connections for (e.g.) more secure hidden service posting and
14211 - More progress on proposal 114: code from Karsten Loesing to
14212 implement new hidden service descriptor format.
14213 - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
14214 accommodate the growing number of servers that use the default
14215 and are reaching it.
14216 - Directory authorities use a new formula for selecting which nodes
14217 to advertise as Guards: they must be in the top 7/8 in terms of
14218 how long we have known about them, and above the median of those
14219 nodes in terms of weighted fractional uptime.
14220 - Make "not enough dir info yet" warnings describe *why* Tor feels
14221 it doesn't have enough directory info yet.
14224 - Stop servers from crashing if they set a Family option (or
14225 maybe in other situations too). Bugfix on 0.2.0.9-alpha; reported
14227 - Make bridge users work again -- the move to v3 directories in
14228 0.2.0.9-alpha had introduced a number of bugs that made bridges
14229 no longer work for clients.
14230 - When the clock jumps forward a lot, do not allow the bandwidth
14231 buckets to become negative. Bugfix on 0.1.2.x; fixes bug 544.
14233 o Major bugfixes (v3 dir, bugfixes on 0.2.0.9-alpha):
14234 - When the consensus lists a router descriptor that we previously were
14235 mirroring, but that we considered non-canonical, reload the
14236 descriptor as canonical. This fixes bug 543 where Tor servers
14237 would start complaining after a few days that they don't have
14238 enough directory information to build a circuit.
14239 - Consider replacing the current consensus when certificates arrive
14240 that make the pending consensus valid. Previously, we were only
14241 considering replacement when the new certs _didn't_ help.
14242 - Fix an assert error on startup if we didn't already have the
14243 consensus and certs cached in our datadirectory: we were caching
14244 the consensus in consensus_waiting_for_certs but then free'ing it
14246 - Avoid sending a request for "keys/fp" (for which we'll get a 400 Bad
14247 Request) if we need more v3 certs but we've already got pending
14248 requests for all of them.
14249 - Correctly back off from failing certificate downloads. Fixes
14251 - Authorities don't vote on the Running flag if they have been running
14252 for less than 30 minutes themselves. Fixes bug 547, where a newly
14253 started authority would vote that everyone was down.
14255 o New requirements:
14256 - Drop support for OpenSSL version 0.9.6. Just about nobody was using
14257 it, it had no AES, and it hasn't seen any security patches since
14261 - Clients now hold circuitless TLS connections open for 1.5 times
14262 MaxCircuitDirtiness (15 minutes), since it is likely that they'll
14263 rebuild a new circuit over them within that timeframe. Previously,
14264 they held them open only for KeepalivePeriod (5 minutes).
14265 - Use "If-Modified-Since" to avoid retrieving consensus
14266 networkstatuses that we already have.
14267 - When we have no consensus, check FallbackNetworkstatusFile (defaults
14268 to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
14269 we start knowing some directory caches.
14270 - When we receive a consensus from the future, warn about skew.
14271 - Improve skew reporting: try to give the user a better log message
14272 about how skewed they are, and how much this matters.
14273 - When we have a certificate for an authority, believe that
14274 certificate's claims about the authority's IP address.
14275 - New --quiet command-line option to suppress the default console log.
14276 Good in combination with --hash-password.
14277 - Authorities send back an X-Descriptor-Not-New header in response to
14278 an accepted-but-discarded descriptor upload. Partially implements
14280 - Make the log message for "tls error. breaking." more useful.
14281 - Better log messages about certificate downloads, to attempt to
14282 track down the second incarnation of bug 546.
14284 o Minor features (bridges):
14285 - If bridge users set UpdateBridgesFromAuthority, but the digest
14286 they ask for is a 404 from the bridge authority, they now fall
14287 back to trying the bridge directly.
14288 - Bridges now use begin_dir to publish their server descriptor to
14289 the bridge authority, even when they haven't set TunnelDirConns.
14291 o Minor features (controller):
14292 - When reporting clock skew, and we know that the clock is _at least
14293 as skewed_ as some value, but we don't know the actual value,
14294 report the value as a "minimum skew."
14297 - Update linux-tor-prio.sh script to allow QoS based on the uid of
14298 the Tor process. Patch from Marco Bonetti with tweaks from Mike
14302 - Refuse to start if both ORPort and UseBridges are set. Bugfix
14303 on 0.2.0.x, suggested by Matt Edman.
14304 - Don't stop fetching descriptors when FetchUselessDescriptors is
14305 set, even if we stop asking for circuits. Bugfix on 0.1.2.x;
14306 reported by tup and ioerror.
14307 - Better log message on vote from unknown authority.
14308 - Don't log "Launching 0 request for 0 router" message.
14310 o Minor bugfixes (memory leaks):
14311 - Stop leaking memory every time we parse a v3 certificate. Bugfix
14313 - Stop leaking memory every time we load a v3 certificate. Bugfix
14314 on 0.2.0.1-alpha. Fixes bug 536.
14315 - Stop leaking a cached networkstatus on exit. Bugfix on
14317 - Stop leaking voter information every time we free a consensus.
14318 Bugfix on 0.2.0.3-alpha.
14319 - Stop leaking signed data every time we check a voter signature.
14320 Bugfix on 0.2.0.3-alpha.
14321 - Stop leaking a signature every time we fail to parse a consensus or
14322 a vote. Bugfix on 0.2.0.3-alpha.
14323 - Stop leaking v2_download_status_map on shutdown. Bugfix on
14325 - Stop leaking conn->nickname every time we make a connection to a
14326 Tor relay without knowing its expected identity digest (e.g. when
14327 using bridges). Bugfix on 0.2.0.3-alpha.
14329 - Minor bugfixes (portability):
14330 - Run correctly on platforms where rlim_t is larger than unsigned
14331 long, and/or where the real limit for number of open files is
14332 OPEN_FILES, not rlim_max from getrlimit(RLIMIT_NOFILES). In
14333 particular, these may be needed for OS X 10.5.
14336 Changes in version 0.1.2.18 - 2007-10-28
14337 Tor 0.1.2.18 fixes many problems including crash bugs, problems with
14338 hidden service introduction that were causing huge delays, and a big
14339 bug that was causing some servers to disappear from the network status
14340 lists for a few hours each day.
14342 o Major bugfixes (crashes):
14343 - If a connection is shut down abruptly because of something that
14344 happened inside connection_flushed_some(), do not call
14345 connection_finished_flushing(). Should fix bug 451:
14346 "connection_stop_writing: Assertion conn->write_event failed"
14347 Bugfix on 0.1.2.7-alpha.
14348 - Fix possible segfaults in functions called from
14349 rend_process_relay_cell().
14351 o Major bugfixes (hidden services):
14352 - Hidden services were choosing introduction points uniquely by
14353 hexdigest, but when constructing the hidden service descriptor
14354 they merely wrote the (potentially ambiguous) nickname.
14355 - Clients now use the v2 intro format for hidden service
14356 connections: they specify their chosen rendezvous point by identity
14357 digest rather than by (potentially ambiguous) nickname. These
14358 changes could speed up hidden service connections dramatically.
14360 o Major bugfixes (other):
14361 - Stop publishing a new server descriptor just because we get a
14362 HUP signal. This led (in a roundabout way) to some servers getting
14363 dropped from the networkstatus lists for a few hours each day.
14364 - When looking for a circuit to cannibalize, consider family as well
14365 as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
14366 circuit cannibalization).
14367 - When a router wasn't listed in a new networkstatus, we were leaving
14368 the flags for that router alone -- meaning it remained Named,
14369 Running, etc -- even though absence from the networkstatus means
14370 that it shouldn't be considered to exist at all anymore. Now we
14371 clear all the flags for routers that fall out of the networkstatus
14372 consensus. Fixes bug 529.
14375 - Don't try to access (or alter) the state file when running
14376 --list-fingerprint or --verify-config or --hash-password. Resolves
14378 - When generating information telling us how to extend to a given
14379 router, do not try to include the nickname if it is
14380 absent. Resolves bug 467.
14381 - Fix a user-triggerable segfault in expand_filename(). (There isn't
14382 a way to trigger this remotely.)
14383 - When sending a status event to the controller telling it that an
14384 OR address is reachable, set the port correctly. (Previously we
14385 were reporting the dir port.)
14386 - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
14387 command. Bugfix on 0.1.2.17.
14388 - When loading bandwidth history, do not believe any information in
14389 the future. Fixes bug 434.
14390 - When loading entry guard information, do not believe any information
14392 - When we have our clock set far in the future and generate an
14393 onion key, then re-set our clock to be correct, we should not stop
14394 the onion key from getting rotated.
14395 - On some platforms, accept() can return a broken address. Detect
14396 this more quietly, and deal accordingly. Fixes bug 483.
14397 - It's not actually an error to find a non-pending entry in the DNS
14398 cache when canceling a pending resolve. Don't log unless stuff
14399 is fishy. Resolves bug 463.
14400 - Don't reset trusted dir server list when we set a configuration
14401 option. Patch from Robert Hogan.
14402 - Don't try to create the datadir when running --verify-config or
14403 --hash-password. Resolves bug 540.
14406 Changes in version 0.2.0.9-alpha - 2007-10-24
14407 This ninth development snapshot switches clients to the new v3 directory
14408 system; allows servers to be listed in the network status even when they
14409 have the same nickname as a registered server; and fixes many other
14410 bugs including a big one that was causing some servers to disappear
14411 from the network status lists for a few hours each day.
14413 o Major features (directory system):
14414 - Clients now download v3 consensus networkstatus documents instead
14415 of v2 networkstatus documents. Clients and caches now base their
14416 opinions about routers on these consensus documents. Clients only
14417 download router descriptors listed in the consensus.
14418 - Authorities now list servers who have the same nickname as
14419 a different named server, but list them with a new flag,
14420 "Unnamed". Now we can list servers that happen to pick the same
14421 nickname as a server that registered two years ago and then
14422 disappeared. Partially implements proposal 122.
14423 - If the consensus lists a router as "Unnamed", the name is assigned
14424 to a different router: do not identify the router by that name.
14425 Partially implements proposal 122.
14426 - Authorities can now come to a consensus on which method to use to
14427 compute the consensus. This gives us forward compatibility.
14430 - Stop publishing a new server descriptor just because we HUP or
14431 when we find our DirPort to be reachable but won't actually publish
14432 it. New descriptors without any real changes are dropped by the
14433 authorities, and can screw up our "publish every 18 hours" schedule.
14435 - When a router wasn't listed in a new networkstatus, we were leaving
14436 the flags for that router alone -- meaning it remained Named,
14437 Running, etc -- even though absence from the networkstatus means
14438 that it shouldn't be considered to exist at all anymore. Now we
14439 clear all the flags for routers that fall out of the networkstatus
14440 consensus. Fixes bug 529; bugfix on 0.1.2.x.
14441 - Fix awful behavior in DownloadExtraInfo option where we'd fetch
14442 extrainfo documents and then discard them immediately for not
14443 matching the latest router. Bugfix on 0.2.0.1-alpha.
14445 o Minor features (v3 directory protocol):
14446 - Allow tor-gencert to generate a new certificate without replacing
14448 - Allow certificates to include an address.
14449 - When we change our directory-cache settings, reschedule all voting
14450 and download operations.
14451 - Reattempt certificate downloads immediately on failure, as long as
14452 we haven't failed a threshold number of times yet.
14453 - Delay retrying consensus downloads while we're downloading
14454 certificates to verify the one we just got. Also, count getting a
14455 consensus that we already have (or one that isn't valid) as a failure,
14456 and count failing to get the certificates after 20 minutes as a
14458 - Build circuits and download descriptors even if our consensus is a
14459 little expired. (This feature will go away once authorities are
14462 o Minor features (router descriptor cache):
14463 - If we find a cached-routers file that's been sitting around for more
14464 than 28 days unmodified, then most likely it's a leftover from
14465 when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
14467 - When we (as a cache) download a descriptor because it was listed
14468 in a consensus, remember when the consensus was supposed to expire,
14469 and don't expire the descriptor until then.
14471 o Minor features (performance):
14472 - Call routerlist_remove_old_routers() much less often. This should
14473 speed startup, especially on directory caches.
14474 - Don't try to launch new descriptor downloads quite so often when we
14475 already have enough directory information to build circuits.
14476 - Base64 decoding was actually showing up on our profile when parsing
14477 the initial descriptor file; switch to an in-process all-at-once
14478 implementation that's about 3.5x times faster than calling out to
14481 o Minor features (compilation):
14482 - Detect non-ASCII platforms (if any still exist) and refuse to
14483 build there: some of our code assumes that 'A' is 65 and so on.
14485 o Minor bugfixes (v3 directory authorities, bugfixes on 0.2.0.x):
14486 - Make the "next period" votes into "current period" votes immediately
14487 after publishing the consensus; avoid a heisenbug that made them
14488 stick around indefinitely.
14489 - When we discard a vote as a duplicate, do not report this as
14491 - Treat missing v3 keys or certificates as an error when running as a
14492 v3 directory authority.
14493 - When we're configured to be a v3 authority, but we're only listed
14494 as a non-v3 authority in our DirServer line for ourself, correct
14496 - If an authority doesn't have a qualified hostname, just put
14497 its address in the vote. This fixes the problem where we referred to
14498 "moria on moria:9031."
14499 - Distinguish between detached signatures for the wrong period, and
14500 detached signatures for a divergent vote.
14501 - Fix a small memory leak when computing a consensus.
14502 - When there's no concensus, we were forming a vote every 30
14503 minutes, but writing the "valid-after" line in our vote based
14504 on our configured V3AuthVotingInterval: so unless the intervals
14505 matched up, we immediately rejected our own vote because it didn't
14506 start at the voting interval that caused us to construct a vote.
14508 o Minor bugfixes (v3 directory protocol, bugfixes on 0.2.0.x):
14509 - Delete unverified-consensus when the real consensus is set.
14510 - Consider retrying a consensus networkstatus fetch immediately
14511 after one fails: don't wait 60 seconds to notice.
14512 - When fetching a consensus as a cache, wait until a newer consensus
14513 should exist before trying to replace the current one.
14514 - Use a more forgiving schedule for retrying failed consensus
14515 downloads than for other types.
14517 o Minor bugfixes (other directory issues):
14518 - Correct the implementation of "download votes by digest." Bugfix on
14520 - Authorities no longer send back "400 you're unreachable please fix
14521 it" errors to Tor servers that aren't online all the time. We're
14522 supposed to tolerate these servers now. Bugfix on 0.1.2.x.
14524 o Minor bugfixes (controller):
14525 - Don't reset trusted dir server list when we set a configuration
14526 option. Patch from Robert Hogan; bugfix on 0.1.2.x.
14527 - Respond to INT and TERM SIGNAL commands before we execute the
14528 signal, in case the signal shuts us down. We had a patch in
14529 0.1.2.1-alpha that tried to do this by queueing the response on
14530 the connection's buffer before shutting down, but that really
14531 isn't the same thing at all. Bug located by Matt Edman.
14533 o Minor bugfixes (misc):
14534 - Correctly check for bad options to the "PublishServerDescriptor"
14535 config option. Bugfix on 0.2.0.1-alpha; reported by Matt Edman.
14536 - Stop leaking memory on failing case of base32_decode, and make
14537 it accept upper-case letters. Bugfixes on 0.2.0.7-alpha.
14538 - Don't try to download extrainfo documents when we're trying to
14539 fetch enough directory info to build a circuit: having enough
14540 info should get priority. Bugfix on 0.2.0.x.
14541 - Don't complain that "your server has not managed to confirm that its
14542 ports are reachable" if we haven't been able to build any circuits
14543 yet. Bug found by spending four hours without a v3 consensus. Bugfix
14545 - Detect the reason for failing to mmap a descriptor file we just
14546 wrote, and give a more useful log message. Fixes bug 533. Bugfix
14549 o Code simplifications and refactoring:
14550 - Remove support for the old bw_accounting file: we've been storing
14551 bandwidth accounting information in the state file since
14552 0.1.2.5-alpha. This may result in bandwidth accounting errors
14553 if you try to upgrade from 0.1.1.x or earlier, or if you try to
14554 downgrade to 0.1.1.x or earlier.
14555 - New convenience code to locate a file within the DataDirectory.
14556 - Move non-authority functionality out of dirvote.c.
14557 - Refactor the arguments for router_pick_{directory_|trusteddir}server
14558 so that they all take the same named flags.
14561 - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
14562 Unix users an easy way to script their Tor process (e.g. by
14563 adjusting bandwidth based on the time of the day).
14566 Changes in version 0.2.0.8-alpha - 2007-10-12
14567 This eighth development snapshot fixes a crash bug that's been bothering
14568 us since February 2007, lets bridge authorities store a list of bridge
14569 descriptors they've seen, gets v3 directory voting closer to working,
14570 starts caching v3 directory consensus documents on directory mirrors,
14571 and fixes a variety of smaller issues including some minor memory leaks.
14573 o Major features (router descriptor cache):
14574 - Store routers in a file called cached-descriptors instead of in
14575 cached-routers. Initialize cached-descriptors from cached-routers
14576 if the old format is around. The new format allows us to store
14577 annotations along with descriptors.
14578 - Use annotations to record the time we received each descriptor, its
14579 source, and its purpose.
14580 - Disable the SETROUTERPURPOSE controller command: it is now
14582 - Controllers should now specify cache=no or cache=yes when using
14583 the +POSTDESCRIPTOR command.
14584 - Bridge authorities now write bridge descriptors to disk, meaning
14585 we can export them to other programs and begin distributing them
14588 o Major features (directory authorities):
14589 - When a v3 authority is missing votes or signatures, it now tries
14591 - Directory authorities track weighted fractional uptime as well as
14592 weighted mean-time-between failures. WFU is suitable for deciding
14593 whether a node is "usually up", while MTBF is suitable for deciding
14594 whether a node is "likely to stay up." We need both, because
14595 "usually up" is a good requirement for guards, while "likely to
14596 stay up" is a good requirement for long-lived connections.
14598 o Major features (v3 directory system):
14599 - Caches now download v3 network status documents as needed,
14600 and download the descriptors listed in them.
14601 - All hosts now attempt to download and keep fresh v3 authority
14602 certificates, and re-attempt after failures.
14603 - More internal-consistency checks for vote parsing.
14605 o Major bugfixes (crashes):
14606 - If a connection is shut down abruptly because of something that
14607 happened inside connection_flushed_some(), do not call
14608 connection_finished_flushing(). Should fix bug 451. Bugfix on
14611 o Major bugfixes (performance):
14612 - Fix really bad O(n^2) performance when parsing a long list of
14613 routers: Instead of searching the entire list for an "extra-info "
14614 string which usually wasn't there, once for every routerinfo
14615 we read, just scan lines forward until we find one we like.
14617 - When we add data to a write buffer in response to the data on that
14618 write buffer getting low because of a flush, do not consider the
14619 newly added data as a candidate for immediate flushing, but rather
14620 make it wait until the next round of writing. Otherwise, we flush
14621 and refill recursively, and a single greedy TLS connection can
14622 eat all of our bandwidth. Bugfix on 0.1.2.7-alpha.
14624 o Minor features (v3 authority system):
14625 - Add more ways for tools to download the votes that lead to the
14627 - Send a 503 when low on bandwidth and a vote, consensus, or
14628 certificate is requested.
14629 - If-modified-since is now implemented properly for all kinds of
14630 certificate requests.
14632 o Minor bugfixes (network statuses):
14633 - Tweak the implementation of proposal 109 slightly: allow at most
14634 two Tor servers on the same IP address, except if it's the location
14635 of a directory authority, in which case allow five. Bugfix on
14638 o Minor bugfixes (controller):
14639 - When sending a status event to the controller telling it that an
14640 OR address is reachable, set the port correctly. (Previously we
14641 were reporting the dir port.) Bugfix on 0.1.2.x.
14643 o Minor bugfixes (v3 directory system):
14644 - Fix logic to look up a cert by its signing key digest. Bugfix on
14646 - Only change the reply to a vote to "OK" if it's not already
14647 set. This gets rid of annoying "400 OK" log messages, which may
14648 have been masking some deeper issue. Bugfix on 0.2.0.7-alpha.
14649 - When we get a valid consensus, recompute the voting schedule.
14650 - Base the valid-after time of a vote on the consensus voting
14651 schedule, not on our preferred schedule.
14652 - Make the return values and messages from signature uploads and
14653 downloads more sensible.
14654 - Fix a memory leak when serving votes and consensus documents, and
14655 another when serving certificates.
14657 o Minor bugfixes (performance):
14658 - Use a slightly simpler string hashing algorithm (copying Python's
14659 instead of Java's) and optimize our digest hashing algorithm to take
14660 advantage of 64-bit platforms and to remove some possibly-costly
14662 - Fix a minor memory leak whenever we parse guards from our state
14663 file. Bugfix on 0.2.0.7-alpha.
14664 - Fix a minor memory leak whenever we write out a file. Bugfix on
14666 - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
14667 command. Bugfix on 0.2.0.5-alpha.
14669 o Minor bugfixes (portability):
14670 - On some platforms, accept() can return a broken address. Detect
14671 this more quietly, and deal accordingly. Fixes bug 483.
14672 - Stop calling tor_strlower() on uninitialized memory in some cases.
14673 Bugfix in 0.2.0.7-alpha.
14675 o Minor bugfixes (usability):
14676 - Treat some 403 responses from directory servers as INFO rather than
14677 WARN-severity events.
14678 - It's not actually an error to find a non-pending entry in the DNS
14679 cache when canceling a pending resolve. Don't log unless stuff is
14680 fishy. Resolves bug 463.
14682 o Minor bugfixes (anonymity):
14683 - Never report that we've used more bandwidth than we're willing to
14684 relay: it leaks how much non-relay traffic we're using. Resolves
14686 - When looking for a circuit to cannibalize, consider family as well
14687 as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
14688 circuit cannibalization).
14690 o Code simplifications and refactoring:
14691 - Make a bunch of functions static. Remove some dead code.
14692 - Pull out about a third of the really big routerlist.c; put it in a
14693 new module, networkstatus.c.
14694 - Merge the extra fields in local_routerstatus_t back into
14695 routerstatus_t: we used to need one routerstatus_t for each
14696 authority's opinion, plus a local_routerstatus_t for the locally
14697 computed consensus opinion. To save space, we put the locally
14698 modified fields into local_routerstatus_t, and only the common
14699 stuff into routerstatus_t. But once v3 directories are in use,
14700 clients and caches will no longer need to hold authority opinions;
14701 thus, the rationale for keeping the types separate is now gone.
14702 - Make the code used to reschedule and reattempt downloads more
14704 - Turn all 'Are we a directory server/mirror?' logic into a call to
14706 - Remove the code to generate the oldest (v1) directory format.
14707 The code has been disabled since 0.2.0.5-alpha.
14710 Changes in version 0.2.0.7-alpha - 2007-09-21
14711 This seventh development snapshot makes bridges work again, makes bridge
14712 authorities work for the first time, fixes two huge performance flaws
14713 in hidden services, and fixes a variety of minor issues.
14715 o New directory authorities:
14716 - Set up moria1 and tor26 as the first v3 directory authorities. See
14717 doc/spec/dir-spec.txt for details on the new directory design.
14719 o Major bugfixes (crashes):
14720 - Fix possible segfaults in functions called from
14721 rend_process_relay_cell(). Bugfix on 0.1.2.x.
14723 o Major bugfixes (bridges):
14724 - Fix a bug that made servers send a "404 Not found" in response to
14725 attempts to fetch their server descriptor. This caused Tor servers
14726 to take many minutes to establish reachability for their DirPort,
14727 and it totally crippled bridges. Bugfix on 0.2.0.5-alpha.
14728 - Make "UpdateBridgesFromAuthority" torrc option work: when bridge
14729 users configure that and specify a bridge with an identity
14730 fingerprint, now they will lookup the bridge descriptor at the
14731 default bridge authority via a one-hop tunnel, but once circuits
14732 are established they will switch to a three-hop tunnel for later
14733 connections to the bridge authority. Bugfix in 0.2.0.3-alpha.
14735 o Major bugfixes (hidden services):
14736 - Hidden services were choosing introduction points uniquely by
14737 hexdigest, but when constructing the hidden service descriptor
14738 they merely wrote the (potentially ambiguous) nickname.
14739 - Clients now use the v2 intro format for hidden service
14740 connections: they specify their chosen rendezvous point by identity
14741 digest rather than by (potentially ambiguous) nickname. Both
14742 are bugfixes on 0.1.2.x, and they could speed up hidden service
14743 connections dramatically. Thanks to Karsten Loesing.
14745 o Minor features (security):
14746 - As a client, do not believe any server that tells us that an
14747 address maps to an internal address space.
14748 - Make it possible to enable HashedControlPassword and
14749 CookieAuthentication at the same time.
14751 o Minor features (guard nodes):
14752 - Tag every guard node in our state file with the version that
14753 we believe added it, or with our own version if we add it. This way,
14754 if a user temporarily runs an old version of Tor and then switches
14755 back to a new one, she doesn't automatically lose her guards.
14757 o Minor features (speed):
14758 - When implementing AES counter mode, update only the portions of the
14759 counter buffer that need to change, and don't keep separate
14760 network-order and host-order counters when they are the same (i.e.,
14761 on big-endian hosts.)
14763 o Minor features (controller):
14764 - Accept LF instead of CRLF on controller, since some software has a
14765 hard time generating real Internet newlines.
14766 - Add GETINFO values for the server status events
14767 "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
14770 o Removed features:
14771 - Routers no longer include bandwidth-history lines in their
14772 descriptors; this information is already available in extra-info
14773 documents, and including it in router descriptors took up 60%
14774 (!) of compressed router descriptor downloads. Completes
14775 implementation of proposal 104.
14776 - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
14777 and TorControl.py, as they use the old v0 controller protocol,
14778 and are obsoleted by TorFlow anyway.
14779 - Drop support for v1 rendezvous descriptors, since we never used
14780 them anyway, and the code has probably rotted by now. Based on
14781 patch from Karsten Loesing.
14782 - On OSX, stop warning the user that kqueue support in libevent is
14783 "experimental", since it seems to have worked fine for ages.
14786 - When generating information telling us how to extend to a given
14787 router, do not try to include the nickname if it is absent. Fixes
14788 bug 467. Bugfix on 0.2.0.3-alpha.
14789 - Fix a user-triggerable (but not remotely-triggerable) segfault
14790 in expand_filename(). Bugfix on 0.1.2.x.
14791 - Fix a memory leak when freeing incomplete requests from DNSPort.
14792 Found by Niels Provos with valgrind. Bugfix on 0.2.0.1-alpha.
14793 - Don't try to access (or alter) the state file when running
14794 --list-fingerprint or --verify-config or --hash-password. (Resolves
14795 bug 499.) Bugfix on 0.1.2.x.
14796 - Servers used to decline to publish their DirPort if their
14797 BandwidthRate, RelayBandwidthRate, or MaxAdvertisedBandwidth
14798 were below a threshold. Now they only look at BandwidthRate and
14799 RelayBandwidthRate. Bugfix on 0.1.2.x.
14800 - Remove an optimization in the AES counter-mode code that assumed
14801 that the counter never exceeded 2^68. When the counter can be set
14802 arbitrarily as an IV (as it is by Karsten's new hidden services
14803 code), this assumption no longer holds. Bugfix on 0.1.2.x.
14804 - Resume listing "AUTHORITY" flag for authorities in network status.
14805 Bugfix on 0.2.0.3-alpha; reported by Alex de Joode.
14807 o Code simplifications and refactoring:
14808 - Revamp file-writing logic so we don't need to have the entire
14809 contents of a file in memory at once before we write to disk. Tor,
14811 - Turn "descriptor store" into a full-fledged type.
14812 - Move all NT services code into a separate source file.
14813 - Unify all code that computes medians, percentile elements, etc.
14814 - Get rid of a needless malloc when parsing address policies.
14817 Changes in version 0.1.2.17 - 2007-08-30
14818 Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
14819 X bundles. Vidalia 0.0.14 makes authentication required for the
14820 ControlPort in the default configuration, which addresses important
14821 security risks. Everybody who uses Vidalia (or another controller)
14824 In addition, this Tor update fixes major load balancing problems with
14825 path selection, which should speed things up a lot once many people
14828 o Major bugfixes (security):
14829 - We removed support for the old (v0) control protocol. It has been
14830 deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
14831 become more of a headache than it's worth.
14833 o Major bugfixes (load balancing):
14834 - When choosing nodes for non-guard positions, weight guards
14835 proportionally less, since they already have enough load. Patch
14837 - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
14838 will allow fast Tor servers to get more attention.
14839 - When we're upgrading from an old Tor version, forget our current
14840 guards and pick new ones according to the new weightings. These
14841 three load balancing patches could raise effective network capacity
14842 by a factor of four. Thanks to Mike Perry for measurements.
14844 o Major bugfixes (stream expiration):
14845 - Expire not-yet-successful application streams in all cases if
14846 they've been around longer than SocksTimeout. Right now there are
14847 some cases where the stream will live forever, demanding a new
14848 circuit every 15 seconds. Fixes bug 454; reported by lodger.
14850 o Minor features (controller):
14851 - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
14852 is valid before any authentication has been received. It tells
14853 a controller what kind of authentication is expected, and what
14854 protocol is spoken. Implements proposal 119.
14856 o Minor bugfixes (performance):
14857 - Save on most routerlist_assert_ok() calls in routerlist.c, thus
14858 greatly speeding up loading cached-routers from disk on startup.
14859 - Disable sentinel-based debugging for buffer code: we squashed all
14860 the bugs that this was supposed to detect a long time ago, and now
14861 its only effect is to change our buffer sizes from nice powers of
14862 two (which platform mallocs tend to like) to values slightly over
14863 powers of two (which make some platform mallocs sad).
14865 o Minor bugfixes (misc):
14866 - If exit bandwidth ever exceeds one third of total bandwidth, then
14867 use the correct formula to weight exit nodes when choosing paths.
14868 Based on patch from Mike Perry.
14869 - Choose perfectly fairly among routers when choosing by bandwidth and
14870 weighting by fraction of bandwidth provided by exits. Previously, we
14871 would choose with only approximate fairness, and correct ourselves
14872 if we ran off the end of the list.
14873 - If we require CookieAuthentication but we fail to write the
14874 cookie file, we would warn but not exit, and end up in a state
14875 where no controller could authenticate. Now we exit.
14876 - If we require CookieAuthentication, stop generating a new cookie
14877 every time we change any piece of our config.
14878 - Refuse to start with certain directory authority keys, and
14879 encourage people using them to stop.
14880 - Terminate multi-line control events properly. Original patch
14882 - Fix a minor memory leak when we fail to find enough suitable
14883 servers to choose a circuit.
14884 - Stop leaking part of the descriptor when we run into a particularly
14885 unparseable piece of it.
14888 Changes in version 0.2.0.6-alpha - 2007-08-26
14889 This sixth development snapshot features a new Vidalia version in the
14890 Windows and OS X bundles. Vidalia 0.0.14 makes authentication required for
14891 the ControlPort in the default configuration, which addresses important
14894 In addition, this snapshot fixes major load balancing problems
14895 with path selection, which should speed things up a lot once many
14896 people have upgraded. The directory authorities also use a new
14897 mean-time-between-failure approach to tracking which servers are stable,
14898 rather than just looking at the most recent uptime.
14900 o New directory authorities:
14901 - Set up Tonga as the default bridge directory authority.
14904 - Directory authorities now track servers by weighted
14905 mean-times-between-failures. When we have 4 or more days of data,
14906 use measured MTBF rather than declared uptime to decide whether
14907 to call a router Stable. Implements proposal 108.
14909 o Major bugfixes (load balancing):
14910 - When choosing nodes for non-guard positions, weight guards
14911 proportionally less, since they already have enough load. Patch
14913 - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
14914 will allow fast Tor servers to get more attention.
14915 - When we're upgrading from an old Tor version, forget our current
14916 guards and pick new ones according to the new weightings. These
14917 three load balancing patches could raise effective network capacity
14918 by a factor of four. Thanks to Mike Perry for measurements.
14920 o Major bugfixes (descriptor parsing):
14921 - Handle unexpected whitespace better in malformed descriptors. Bug
14922 found using Benedikt Boss's new Tor fuzzer! Bugfix on 0.2.0.x.
14925 - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
14926 GETINFO for Torstat to use until it can switch to using extrainfos.
14927 - Optionally (if built with -DEXPORTMALLINFO) export the output
14928 of mallinfo via http, as tor/mallinfo.txt. Only accessible
14932 - Do not intermix bridge routers with controller-added
14933 routers. (Bugfix on 0.2.0.x)
14934 - Do not fail with an assert when accept() returns an unexpected
14935 address family. Addresses but does not wholly fix bug 483. (Bugfix
14937 - Let directory authorities startup even when they can't generate
14938 a descriptor immediately, e.g. because they don't know their
14940 - Stop putting the authentication cookie in a file called "0"
14941 in your working directory if you don't specify anything for the
14942 new CookieAuthFile option. Reported by Matt Edman.
14943 - Make it possible to read the PROTOCOLINFO response in a way that
14944 conforms to our control-spec. Reported by Matt Edman.
14945 - Fix a minor memory leak when we fail to find enough suitable
14946 servers to choose a circuit. Bugfix on 0.1.2.x.
14947 - Stop leaking part of the descriptor when we run into a particularly
14948 unparseable piece of it. Bugfix on 0.1.2.x.
14949 - Unmap the extrainfo cache file on exit.
14952 Changes in version 0.2.0.5-alpha - 2007-08-19
14953 This fifth development snapshot fixes compilation on Windows again;
14954 fixes an obnoxious client-side bug that slowed things down and put
14955 extra load on the network; gets us closer to using the v3 directory
14956 voting scheme; makes it easier for Tor controllers to use cookie-based
14957 authentication; and fixes a variety of other bugs.
14959 o Removed features:
14960 - Version 1 directories are no longer generated in full. Instead,
14961 authorities generate and serve "stub" v1 directories that list
14962 no servers. This will stop Tor versions 0.1.0.x and earlier from
14963 working, but (for security reasons) nobody should be running those
14966 o Major bugfixes (compilation, 0.2.0.x):
14967 - Try to fix Win32 compilation again: improve checking for IPv6 types.
14968 - Try to fix MSVC compilation: build correctly on platforms that do
14969 not define s6_addr16 or s6_addr32.
14970 - Fix compile on platforms without getaddrinfo: bug found by Li-Hui
14973 o Major bugfixes (stream expiration):
14974 - Expire not-yet-successful application streams in all cases if
14975 they've been around longer than SocksTimeout. Right now there are
14976 some cases where the stream will live forever, demanding a new
14977 circuit every 15 seconds. Bugfix on 0.1.2.7-alpha; fixes bug 454;
14978 reported by lodger.
14980 o Minor features (directory servers):
14981 - When somebody requests a list of statuses or servers, and we have
14982 none of those, return a 404 rather than an empty 200.
14984 o Minor features (directory voting):
14985 - Store v3 consensus status consensuses on disk, and reload them
14988 o Minor features (security):
14989 - Warn about unsafe ControlPort configurations.
14990 - Refuse to start with certain directory authority keys, and
14991 encourage people using them to stop.
14993 o Minor features (controller):
14994 - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
14995 is valid before any authentication has been received. It tells
14996 a controller what kind of authentication is expected, and what
14997 protocol is spoken. Implements proposal 119.
14998 - New config option CookieAuthFile to choose a new location for the
14999 cookie authentication file, and config option
15000 CookieAuthFileGroupReadable to make it group-readable.
15002 o Minor features (unit testing):
15003 - Add command-line arguments to unit-test executable so that we can
15004 invoke any chosen test from the command line rather than having
15005 to run the whole test suite at once; and so that we can turn on
15006 logging for the unit tests.
15008 o Minor bugfixes (on 0.1.2.x):
15009 - If we require CookieAuthentication but we fail to write the
15010 cookie file, we would warn but not exit, and end up in a state
15011 where no controller could authenticate. Now we exit.
15012 - If we require CookieAuthentication, stop generating a new cookie
15013 every time we change any piece of our config.
15014 - When loading bandwidth history, do not believe any information in
15015 the future. Fixes bug 434.
15016 - When loading entry guard information, do not believe any information
15018 - When we have our clock set far in the future and generate an
15019 onion key, then re-set our clock to be correct, we should not stop
15020 the onion key from getting rotated.
15021 - Clean up torrc sample config file.
15022 - Do not automatically run configure from autogen.sh. This
15023 non-standard behavior tended to annoy people who have built other
15026 o Minor bugfixes (on 0.2.0.x):
15027 - Fix a bug with AutomapHostsOnResolve that would always cause
15028 the second request to fail. Bug reported by Kate. Bugfix on
15030 - Fix a bug in ADDRMAP controller replies that would sometimes
15031 try to print a NULL. Patch from tup.
15032 - Read v3 directory authority keys from the right location.
15033 - Numerous bugfixes to directory voting code.
15036 Changes in version 0.1.2.16 - 2007-08-01
15037 Tor 0.1.2.16 fixes a critical security vulnerability that allows a
15038 remote attacker in certain situations to rewrite the user's torrc
15039 configuration file. This can completely compromise anonymity of users
15040 in most configurations, including those running the Vidalia bundles,
15041 TorK, etc. Or worse.
15043 o Major security fixes:
15044 - Close immediately after missing authentication on control port;
15045 do not allow multiple authentication attempts.
15048 Changes in version 0.2.0.4-alpha - 2007-08-01
15049 This fourth development snapshot fixes a critical security vulnerability
15050 for most users, specifically those running Vidalia, TorK, etc. Everybody
15051 should upgrade to either 0.1.2.16 or 0.2.0.4-alpha.
15053 o Major security fixes:
15054 - Close immediately after missing authentication on control port;
15055 do not allow multiple authentication attempts.
15057 o Major bugfixes (compilation):
15058 - Fix win32 compilation: apparently IN_ADDR and IN6_ADDR are already
15061 o Minor features (performance):
15062 - Be even more aggressive about releasing RAM from small
15063 empty buffers. Thanks to our free-list code, this shouldn't be too
15064 performance-intensive.
15065 - Disable sentinel-based debugging for buffer code: we squashed all
15066 the bugs that this was supposed to detect a long time ago, and
15067 now its only effect is to change our buffer sizes from nice
15068 powers of two (which platform mallocs tend to like) to values
15069 slightly over powers of two (which make some platform mallocs sad).
15070 - Log malloc statistics from mallinfo() on platforms where it
15074 Changes in version 0.2.0.3-alpha - 2007-07-29
15075 This third development snapshot introduces new experimental
15076 blocking-resistance features and a preliminary version of the v3
15077 directory voting design, and includes many other smaller features
15081 - The first pieces of our "bridge" design for blocking-resistance
15082 are implemented. People can run bridge directory authorities;
15083 people can run bridges; and people can configure their Tor clients
15084 with a set of bridges to use as the first hop into the Tor network.
15085 See http://archives.seul.org/or/talk/Jul-2007/msg00249.html for
15087 - Create listener connections before we setuid to the configured
15088 User and Group. Now non-Windows users can choose port values
15089 under 1024, start Tor as root, and have Tor bind those ports
15090 before it changes to another UID. (Windows users could already
15092 - Added a new ConstrainedSockets config option to set SO_SNDBUF and
15093 SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
15094 on "vserver" accounts. (Patch from coderman.)
15095 - Be even more aggressive about separating local traffic from relayed
15096 traffic when RelayBandwidthRate is set. (Refines proposal 111.)
15098 o Major features (experimental):
15099 - First cut of code for "v3 dir voting": directory authorities will
15100 vote on a common network status document rather than each publishing
15101 their own opinion. This code needs more testing and more corner-case
15102 handling before it's ready for use.
15105 - Directory authorities now call routers Fast if their bandwidth is
15106 at least 100KB/s, and consider their bandwidth adequate to be a
15107 Guard if it is at least 250KB/s, no matter the medians. This fix
15108 complements proposal 107. [Bugfix on 0.1.2.x]
15109 - Directory authorities now never mark more than 3 servers per IP as
15110 Valid and Running. (Implements proposal 109, by Kevin Bauer and
15112 - Minor change to organizationName and commonName generation
15113 procedures in TLS certificates during Tor handshakes, to invalidate
15114 some earlier censorware approaches. This is not a long-term
15115 solution, but applying it will give us a bit of time to look into
15116 the epidemiology of countermeasures as they spread.
15118 o Major bugfixes (directory):
15119 - Rewrite directory tokenization code to never run off the end of
15120 a string. Fixes bug 455. Patch from croup. [Bugfix on 0.1.2.x]
15122 o Minor features (controller):
15123 - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
15124 match requests to applications. (Patch from Robert Hogan.)
15125 - Report address and port correctly on connections to DNSPort. (Patch
15126 from Robert Hogan.)
15127 - Add a RESOLVE command to launch hostname lookups. (Original patch
15128 from Robert Hogan.)
15129 - Add GETINFO status/enough-dir-info to let controllers tell whether
15130 Tor has downloaded sufficient directory information. (Patch
15132 - You can now use the ControlSocket option to tell Tor to listen for
15133 controller connections on Unix domain sockets on systems that
15134 support them. (Patch from Peter Palfrader.)
15135 - STREAM NEW events are generated for DNSPort requests and for
15136 tunneled directory connections. (Patch from Robert Hogan.)
15137 - New "GETINFO address-mappings/*" command to get address mappings
15138 with expiry information. "addr-mappings/*" is now deprecated.
15141 o Minor features (misc):
15142 - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
15144 - The tor-gencert tool for v3 directory authorities now creates all
15145 files as readable to the file creator only, and write-protects
15146 the authority identity key.
15147 - When dumping memory usage, list bytes used in buffer memory
15149 - When running with dmalloc, dump more stats on hup and on exit.
15150 - Directory authorities now fail quickly and (relatively) harmlessly
15151 if they generate a network status document that is somehow
15154 o Traffic load balancing improvements:
15155 - If exit bandwidth ever exceeds one third of total bandwidth, then
15156 use the correct formula to weight exit nodes when choosing paths.
15157 (Based on patch from Mike Perry.)
15158 - Choose perfectly fairly among routers when choosing by bandwidth and
15159 weighting by fraction of bandwidth provided by exits. Previously, we
15160 would choose with only approximate fairness, and correct ourselves
15161 if we ran off the end of the list. [Bugfix on 0.1.2.x]
15163 o Performance improvements:
15164 - Be more aggressive with freeing buffer RAM or putting it on the
15166 - Use Critical Sections rather than Mutexes for synchronizing threads
15167 on win32; Mutexes are heavier-weight, and designed for synchronizing
15170 o Deprecated and removed features:
15171 - RedirectExits is now deprecated.
15172 - Stop allowing address masks that do not correspond to bit prefixes.
15173 We have warned about these for a really long time; now it's time
15174 to reject them. (Patch from croup.)
15176 o Minor bugfixes (directory):
15177 - Fix another crash bug related to extra-info caching. (Bug found by
15178 Peter Palfrader.) [Bugfix on 0.2.0.2-alpha]
15179 - Directories no longer return a "304 not modified" when they don't
15180 have the networkstatus the client asked for. Also fix a memory
15181 leak when returning 304 not modified. [Bugfixes on 0.2.0.2-alpha]
15182 - We had accidentally labelled 0.1.2.x directory servers as not
15183 suitable for begin_dir requests, and had labelled no directory
15184 servers as suitable for uploading extra-info documents. [Bugfix
15187 o Minor bugfixes (dns):
15188 - Fix a crash when DNSPort is set more than once. (Patch from Robert
15189 Hogan.) [Bugfix on 0.2.0.2-alpha]
15190 - Add DNSPort connections to the global connection list, so that we
15191 can time them out correctly. (Bug found by Robert Hogan.) [Bugfix
15193 - Fix a dangling reference that could lead to a crash when DNSPort is
15194 changed or closed (Patch from Robert Hogan.) [Bugfix on
15197 o Minor bugfixes (controller):
15198 - Provide DNS expiry times in GMT, not in local time. For backward
15199 compatibility, ADDRMAP events only provide GMT expiry in an extended
15200 field. "GETINFO address-mappings" always does the right thing.
15201 - Use CRLF line endings properly in NS events.
15202 - Terminate multi-line control events properly. (Original patch
15203 from tup.) [Bugfix on 0.1.2.x-alpha]
15204 - Do not include spaces in SOURCE_ADDR fields in STREAM
15205 events. Resolves bug 472. [Bugfix on 0.2.0.x-alpha]
15208 Changes in version 0.1.2.15 - 2007-07-17
15209 Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
15210 problems, fixes compilation on BSD, and fixes a variety of other
15211 bugs. Everybody should upgrade.
15213 o Major bugfixes (compilation):
15214 - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
15216 o Major bugfixes (crashes):
15217 - Try even harder not to dereference the first character after
15218 an mmap(). Reported by lodger.
15219 - Fix a crash bug in directory authorities when we re-number the
15220 routerlist while inserting a new router.
15221 - When the cached-routers file is an even multiple of the page size,
15222 don't run off the end and crash. (Fixes bug 455; based on idea
15224 - Fix eventdns.c behavior on Solaris: It is critical to include
15225 orconfig.h _before_ sys/types.h, so that we can get the expected
15226 definition of _FILE_OFFSET_BITS.
15228 o Major bugfixes (security):
15229 - Fix a possible buffer overrun when using BSD natd support. Bug
15231 - When sending destroy cells from a circuit's origin, don't include
15232 the reason for tearing down the circuit. The spec says we didn't,
15233 and now we actually don't. Reported by lodger.
15234 - Keep streamids from different exits on a circuit separate. This
15235 bug may have allowed other routers on a given circuit to inject
15236 cells into streams. Reported by lodger; fixes bug 446.
15237 - If there's a never-before-connected-to guard node in our list,
15238 never choose any guards past it. This way we don't expand our
15239 guard list unless we need to.
15241 o Minor bugfixes (guard nodes):
15242 - Weight guard selection by bandwidth, so that low-bandwidth nodes
15243 don't get overused as guards.
15245 o Minor bugfixes (directory):
15246 - Correctly count the number of authorities that recommend each
15247 version. Previously, we were under-counting by 1.
15248 - Fix a potential crash bug when we load many server descriptors at
15249 once and some of them make others of them obsolete. Fixes bug 458.
15251 o Minor bugfixes (hidden services):
15252 - Stop tearing down the whole circuit when the user asks for a
15253 connection to a port that the hidden service didn't configure.
15256 o Minor bugfixes (misc):
15257 - On Windows, we were preventing other processes from reading
15258 cached-routers while Tor was running. Reported by janbar.
15259 - Fix a possible (but very unlikely) bug in picking routers by
15260 bandwidth. Add a log message to confirm that it is in fact
15261 unlikely. Patch from lodger.
15262 - Backport a couple of memory leak fixes.
15263 - Backport miscellaneous cosmetic bugfixes.
15266 Changes in version 0.2.0.2-alpha - 2007-06-02
15267 o Major bugfixes on 0.2.0.1-alpha:
15268 - Fix an assertion failure related to servers without extra-info digests.
15269 Resolves bugs 441 and 442.
15271 o Minor features (directory):
15272 - Support "If-Modified-Since" when answering HTTP requests for
15273 directories, running-routers documents, and network-status documents.
15274 (There's no need to support it for router descriptors, since those
15275 are downloaded by descriptor digest.)
15277 o Minor build issues:
15278 - Clear up some MIPSPro compiler warnings.
15279 - When building from a tarball on a machine that happens to have SVK
15280 installed, report the micro-revision as whatever version existed
15281 in the tarball, not as "x".
15284 Changes in version 0.2.0.1-alpha - 2007-06-01
15285 This early development snapshot provides new features for people running
15286 Tor as both a client and a server (check out the new RelayBandwidth
15287 config options); lets Tor run as a DNS proxy; and generally moves us
15288 forward on a lot of fronts.
15290 o Major features, server usability:
15291 - New config options RelayBandwidthRate and RelayBandwidthBurst:
15292 a separate set of token buckets for relayed traffic. Right now
15293 relayed traffic is defined as answers to directory requests, and
15294 OR connections that don't have any local circuits on them.
15296 o Major features, client usability:
15297 - A client-side DNS proxy feature to replace the need for
15298 dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
15299 for DNS requests on port 9999, use the Tor network to resolve them
15300 anonymously, and send the reply back like a regular DNS server.
15301 The code still only implements a subset of DNS.
15302 - Make PreferTunneledDirConns and TunnelDirConns work even when
15303 we have no cached directory info. This means Tor clients can now
15304 do all of their connections protected by TLS.
15306 o Major features, performance and efficiency:
15307 - Directory authorities accept and serve "extra info" documents for
15308 routers. These documents contain fields from router descriptors
15309 that aren't usually needed, and that use a lot of excess
15310 bandwidth. Once these fields are removed from router descriptors,
15311 the bandwidth savings should be about 60%. [Partially implements
15313 - Servers upload extra-info documents to any authority that accepts
15314 them. Authorities (and caches that have been configured to download
15315 extra-info documents) download them as needed. [Partially implements
15317 - Change the way that Tor buffers data that it is waiting to write.
15318 Instead of queueing data cells in an enormous ring buffer for each
15319 client->OR or OR->OR connection, we now queue cells on a separate
15320 queue for each circuit. This lets us use less slack memory, and
15321 will eventually let us be smarter about prioritizing different kinds
15323 - Use memory pools to allocate cells with better speed and memory
15324 efficiency, especially on platforms where malloc() is inefficient.
15325 - Stop reading on edge connections when their corresponding circuit
15326 buffers are full; start again as the circuits empty out.
15328 o Major features, other:
15329 - Add an HSAuthorityRecordStats option that hidden service authorities
15330 can use to track statistics of overall hidden service usage without
15331 logging information that would be very useful to an attacker.
15332 - Start work implementing multi-level keys for directory authorities:
15333 Add a standalone tool to generate key certificates. (Proposal 103.)
15336 - Directory authorities now call routers Stable if they have an
15337 uptime of at least 30 days, even if that's not the median uptime
15338 in the network. Implements proposal 107, suggested by Kevin Bauer
15341 o Minor fixes (resource management):
15342 - Count the number of open sockets separately from the number
15343 of active connection_t objects. This will let us avoid underusing
15344 our allocated connection limit.
15345 - We no longer use socket pairs to link an edge connection to an
15346 anonymous directory connection or a DirPort test connection.
15347 Instead, we track the link internally and transfer the data
15348 in-process. This saves two sockets per "linked" connection (at the
15349 client and at the server), and avoids the nasty Windows socketpair()
15351 - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
15352 for every single inactive connection_t. Free items from the
15353 4k/16k-buffer free lists when they haven't been used for a while.
15355 o Minor features (build):
15356 - Make autoconf search for libevent, openssl, and zlib consistently.
15357 - Update deprecated macros in configure.in.
15358 - When warning about missing headers, tell the user to let us
15359 know if the compile succeeds anyway, so we can downgrade the
15361 - Include the current subversion revision as part of the version
15362 string: either fetch it directly if we're in an SVN checkout, do
15363 some magic to guess it if we're in an SVK checkout, or use
15364 the last-detected version if we're building from a .tar.gz.
15365 Use this version consistently in log messages.
15367 o Minor features (logging):
15368 - Always prepend "Bug: " to any log message about a bug.
15369 - Put a platform string (e.g. "Linux i686") in the startup log
15370 message, so when people paste just their logs, we know if it's
15371 OpenBSD or Windows or what.
15372 - When logging memory usage, break down memory used in buffers by
15375 o Minor features (directory system):
15376 - New config option V2AuthoritativeDirectory that all directory
15377 authorities should set. This will let future authorities choose
15378 not to serve V2 directory information.
15379 - Directory authorities allow multiple router descriptors and/or extra
15380 info documents to be uploaded in a single go. This will make
15381 implementing proposal 104 simpler.
15383 o Minor features (controller):
15384 - Add a new config option __DisablePredictedCircuits designed for
15385 use by the controller, when we don't want Tor to build any circuits
15387 - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
15388 so we can exit from the middle of the circuit.
15389 - Implement "getinfo status/circuit-established".
15390 - Implement "getinfo status/version/..." so a controller can tell
15391 whether the current version is recommended, and whether any versions
15392 are good, and how many authorities agree. (Patch from shibz.)
15394 o Minor features (hidden services):
15395 - Allow multiple HiddenServicePort directives with the same virtual
15396 port; when they occur, the user is sent round-robin to one
15397 of the target ports chosen at random. Partially fixes bug 393 by
15398 adding limited ad-hoc round-robining.
15400 o Minor features (other):
15402 - Add a new AutomapHostsOnResolve option: when it is enabled, any
15403 resolve request for hosts matching a given pattern causes Tor to
15404 generate an internal virtual address mapping for that host. This
15405 allows DNSPort to work sensibly with hidden service users. By
15406 default, .exit and .onion addresses are remapped; the list of
15407 patterns can be reconfigured with AutomapHostsSuffixes.
15408 - Add an "-F" option to tor-resolve to force a resolve for a .onion
15409 address. Thanks to the AutomapHostsOnResolve option, this is no
15410 longer a completely silly thing to do.
15411 - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
15412 now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
15413 - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
15414 minus 1 byte: the actual maximum declared bandwidth.
15416 o Removed features:
15417 - Removed support for the old binary "version 0" controller protocol.
15418 This has been deprecated since 0.1.1, and warnings have been issued
15419 since 0.1.2. When we encounter a v0 control message, we now send
15420 back an error and close the connection.
15421 - Remove the old "dns worker" server DNS code: it hasn't been default
15422 since 0.1.2.2-alpha, and all the servers seem to be using the new
15425 o Minor bugfixes (portability):
15426 - Even though Windows is equally happy with / and \ as path separators,
15427 try to use \ consistently on Windows and / consistently on Unix: it
15428 makes the log messages nicer.
15429 - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
15430 - Read resolv.conf files correctly on platforms where read() returns
15431 partial results on small file reads.
15433 o Minor bugfixes (directory):
15434 - Correctly enforce that elements of directory objects do not appear
15435 more often than they are allowed to appear.
15436 - When we are reporting the DirServer line we just parsed, we were
15437 logging the second stanza of the key fingerprint, not the first.
15439 o Minor bugfixes (logging):
15440 - When we hit an EOF on a log (probably because we're shutting down),
15441 don't try to remove the log from the list: just mark it as
15442 unusable. (Bulletproofs against bug 222.)
15444 o Minor bugfixes (other):
15445 - In the exitlist script, only consider the most recently published
15446 server descriptor for each server. Also, when the user requests
15447 a list of servers that _reject_ connections to a given address,
15448 explicitly exclude the IPs that also have servers that accept
15449 connections to that address. (Resolves bug 405.)
15450 - Stop allowing hibernating servers to be "stable" or "fast".
15451 - On Windows, we were preventing other processes from reading
15452 cached-routers while Tor was running. (Reported by janbar)
15453 - Make the NodeFamilies config option work. (Reported by
15454 lodger -- it has never actually worked, even though we added it
15456 - Check return values from pthread_mutex functions.
15457 - Don't save non-general-purpose router descriptors to the disk cache,
15458 because we have no way of remembering what their purpose was when
15460 - Add even more asserts to hunt down bug 417.
15461 - Build without verbose warnings even on (not-yet-released) gcc 4.2.
15462 - Fix a possible (but very unlikely) bug in picking routers by bandwidth.
15463 Add a log message to confirm that it is in fact unlikely.
15465 o Minor bugfixes (controller):
15466 - Make 'getinfo fingerprint' return a 551 error if we're not a
15467 server, so we match what the control spec claims we do. Reported
15469 - Fix a typo in an error message when extendcircuit fails that
15470 caused us to not follow the \r\n-based delimiter protocol. Reported
15473 o Code simplifications and refactoring:
15474 - Stop passing around circuit_t and crypt_path_t pointers that are
15475 implicit in other procedure arguments.
15476 - Drop the old code to choke directory connections when the
15477 corresponding OR connections got full: thanks to the cell queue
15478 feature, OR conns don't get full any more.
15479 - Make dns_resolve() handle attaching connections to circuits
15480 properly, so the caller doesn't have to.
15481 - Rename wants_to_read and wants_to_write to read/write_blocked_on_bw.
15482 - Keep the connection array as a dynamic smartlist_t, rather than as
15483 a fixed-sized array. This is important, as the number of connections
15484 is becoming increasingly decoupled from the number of sockets.
15487 Changes in version 0.1.2.14 - 2007-05-25
15488 Tor 0.1.2.14 changes the addresses of two directory authorities (this
15489 change especially affects those who serve or use hidden services),
15490 and fixes several other crash- and security-related bugs.
15492 o Directory authority changes:
15493 - Two directory authorities (moria1 and moria2) just moved to new
15494 IP addresses. This change will particularly affect those who serve
15495 or use hidden services.
15497 o Major bugfixes (crashes):
15498 - If a directory server runs out of space in the connection table
15499 as it's processing a begin_dir request, it will free the exit stream
15500 but leave it attached to the circuit, leading to unpredictable
15501 behavior. (Reported by seeess, fixes bug 425.)
15502 - Fix a bug in dirserv_remove_invalid() that would cause authorities
15503 to corrupt memory under some really unlikely scenarios.
15504 - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
15505 - Avoid segfaults when reading from mmaped descriptor file. (Reported
15508 o Major bugfixes (security):
15509 - When choosing an entry guard for a circuit, avoid using guards
15510 that are in the same family as the chosen exit -- not just guards
15511 that are exactly the chosen exit. (Reported by lodger.)
15513 o Major bugfixes (resource management):
15514 - If a directory authority is down, skip it when deciding where to get
15515 networkstatus objects or descriptors. Otherwise we keep asking
15516 every 10 seconds forever. Fixes bug 384.
15517 - Count it as a failure if we fetch a valid network-status but we
15518 don't want to keep it. Otherwise we'll keep fetching it and keep
15519 not wanting to keep it. Fixes part of bug 422.
15520 - If all of our dirservers have given us bad or no networkstatuses
15521 lately, then stop hammering them once per minute even when we
15522 think they're failed. Fixes another part of bug 422.
15525 - Actually set the purpose correctly for descriptors inserted with
15526 purpose=controller.
15527 - When we have k non-v2 authorities in our DirServer config,
15528 we ignored the last k authorities in the list when updating our
15530 - Correctly back-off from requesting router descriptors that we are
15531 having a hard time downloading.
15532 - Read resolv.conf files correctly on platforms where read() returns
15533 partial results on small file reads.
15534 - Don't rebuild the entire router store every time we get 32K of
15535 routers: rebuild it when the journal gets very large, or when
15536 the gaps in the store get very large.
15539 - When routers publish SVN revisions in their router descriptors,
15540 authorities now include those versions correctly in networkstatus
15542 - Warn when using a version of libevent before 1.3b to run a server on
15543 OSX or BSD: these versions interact badly with userspace threads.
15546 Changes in version 0.1.2.13 - 2007-04-24
15547 This release features some major anonymity fixes, such as safer path
15548 selection; better client performance; faster bootstrapping, better
15549 address detection, and better DNS support for servers; write limiting as
15550 well as read limiting to make servers easier to run; and a huge pile of
15551 other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
15553 Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
15554 of the Freenode IRC network, remembering his patience and vision for
15555 free speech on the Internet.
15558 - Fix a memory leak when we ask for "all" networkstatuses and we
15559 get one we don't recognize.
15560 - Add more asserts to hunt down bug 417.
15561 - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
15564 Changes in version 0.1.2.12-rc - 2007-03-16
15566 - Fix an infinite loop introduced in 0.1.2.7-alpha when we serve
15567 directory information requested inside Tor connections (i.e. via
15568 begin_dir cells). It only triggered when the same connection was
15569 serving other data at the same time. Reported by seeess.
15572 - When creating a circuit via the controller, send a 'launched'
15573 event when we're done, so we follow the spec better.
15576 Changes in version 0.1.2.11-rc - 2007-03-15
15577 o Minor bugfixes (controller), reported by daejees:
15578 - Correct the control spec to match how the code actually responds
15579 to 'getinfo addr-mappings/*'.
15580 - The control spec described a GUARDS event, but the code
15581 implemented a GUARD event. Standardize on GUARD, but let people
15582 ask for GUARDS too.
15585 Changes in version 0.1.2.10-rc - 2007-03-07
15586 o Major bugfixes (Windows):
15587 - Do not load the NT services library functions (which may not exist)
15588 just to detect if we're a service trying to shut down. Now we run
15589 on Win98 and friends again.
15591 o Minor bugfixes (other):
15592 - Clarify a couple of log messages.
15593 - Fix a misleading socks5 error number.
15596 Changes in version 0.1.2.9-rc - 2007-03-02
15597 o Major bugfixes (Windows):
15598 - On MinGW, use "%I64u" to printf/scanf 64-bit integers, instead
15599 of the usual GCC "%llu". This prevents a bug when saving 64-bit
15600 int configuration values: the high-order 32 bits would get
15601 truncated. In particular, we were being bitten by the default
15602 MaxAdvertisedBandwidth of 128 TB turning into 0. (Fixes bug 400
15603 and maybe also bug 397.)
15605 o Minor bugfixes (performance):
15606 - Use OpenSSL's AES implementation on platforms where it's faster.
15607 This could save us as much as 10% CPU usage.
15609 o Minor bugfixes (server):
15610 - Do not rotate onion key immediately after setting it for the first
15613 o Minor bugfixes (directory authorities):
15614 - Stop calling servers that have been hibernating for a long time
15615 "stable". Also, stop letting hibernating or obsolete servers affect
15616 uptime and bandwidth cutoffs.
15617 - Stop listing hibernating servers in the v1 directory.
15619 o Minor bugfixes (hidden services):
15620 - Upload hidden service descriptors slightly less often, to reduce
15621 load on authorities.
15623 o Minor bugfixes (other):
15624 - Fix an assert that could trigger if a controller quickly set then
15625 cleared EntryNodes. Bug found by Udo van den Heuvel.
15626 - On architectures where sizeof(int)>4, still clamp declarable bandwidth
15628 - Fix a potential race condition in the rpm installer. Found by
15630 - Try to fix eventdns warnings once and for all: do not treat a dns rcode
15631 of 2 as indicating that the server is completely bad; it sometimes
15632 means that the server is just bad for the request in question. (may fix
15633 the last of bug 326.)
15634 - Disable encrypted directory connections when we don't have a server
15635 descriptor for the destination. We'll get this working again in
15639 Changes in version 0.1.2.8-beta - 2007-02-26
15640 o Major bugfixes (crashes):
15641 - Stop crashing when the controller asks us to resetconf more than
15642 one config option at once. (Vidalia 0.0.11 does this.)
15643 - Fix a crash that happened on Win98 when we're given command-line
15644 arguments: don't try to load NT service functions from advapi32.dll
15645 except when we need them. (Bug introduced in 0.1.2.7-alpha;
15647 - Fix a longstanding obscure crash bug that could occur when
15648 we run out of DNS worker processes. (Resolves bug 390.)
15650 o Major bugfixes (hidden services):
15651 - Correctly detect whether hidden service descriptor downloads are
15652 in-progress. (Suggested by Karsten Loesing; fixes bug 399.)
15654 o Major bugfixes (accounting):
15655 - When we start during an accounting interval before it's time to wake
15656 up, remember to wake up at the correct time. (May fix bug 342.)
15658 o Minor bugfixes (controller):
15659 - Give the controller END_STREAM_REASON_DESTROY events _before_ we
15660 clear the corresponding on_circuit variable, and remember later
15661 that we don't need to send a redundant CLOSED event. Resolves part
15663 - Report events where a resolve succeeded or where we got a socks
15664 protocol error correctly, rather than calling both of them
15666 - Change reported stream target addresses to IP consistently when
15667 we finally get the IP from an exit node.
15668 - Send log messages to the controller even if they happen to be very
15671 o Minor bugfixes (other):
15672 - Display correct results when reporting which versions are
15673 recommended, and how recommended they are. (Resolves bug 383.)
15674 - Improve our estimates for directory bandwidth to be less random:
15675 guess that an unrecognized directory will have the average bandwidth
15676 from all known directories, not that it will have the average
15677 bandwidth from those directories earlier than it on the list.
15678 - If we start a server with ClientOnly 1, then set ClientOnly to 0
15679 and hup, stop triggering an assert based on an empty onion_key.
15680 - On platforms with no working mmap() equivalent, don't warn the
15681 user when cached-routers doesn't exist.
15682 - Warn the user when mmap() [or its equivalent] fails for some reason
15683 other than file-not-found.
15684 - Don't warn the user when cached-routers.new doesn't exist: that's
15685 perfectly fine when starting up for the first time.
15686 - When EntryNodes are configured, rebuild the guard list to contain,
15687 in order: the EntryNodes that were guards before; the rest of the
15688 EntryNodes; the nodes that were guards before.
15689 - Mask out all signals in sub-threads; only the libevent signal
15690 handler should be processing them. This should prevent some crashes
15691 on some machines using pthreads. (Patch from coderman.)
15692 - Fix switched arguments on memset in the implementation of
15693 tor_munmap() for systems with no mmap() call.
15694 - When Tor receives a router descriptor that it asked for, but
15695 no longer wants (because it has received fresh networkstatuses
15696 in the meantime), do not warn the user. Cache the descriptor if
15697 we're a cache; drop it if we aren't.
15698 - Make earlier entry guards _really_ get retried when the network
15700 - On a malformed DNS reply, always give an error to the corresponding
15702 - Build with recent libevents on platforms that do not define the
15703 nonstandard types "u_int8_t" and friends.
15705 o Minor features (controller):
15706 - Warn the user when an application uses the obsolete binary v0
15707 control protocol. We're planning to remove support for it during
15708 the next development series, so it's good to give people some
15710 - Add STREAM_BW events to report per-entry-stream bandwidth
15711 use. (Patch from Robert Hogan.)
15712 - Rate-limit SIGNEWNYM signals in response to controllers that
15713 impolitely generate them for every single stream. (Patch from
15714 mwenge; closes bug 394.)
15715 - Make REMAP stream events have a SOURCE (cache or exit), and
15716 make them generated in every case where we get a successful
15717 connected or resolved cell.
15719 o Minor bugfixes (performance):
15720 - Call router_have_min_dir_info half as often. (This is showing up in
15721 some profiles, but not others.)
15722 - When using GCC, make log_debug never get called at all, and its
15723 arguments never get evaluated, when no debug logs are configured.
15724 (This is showing up in some profiles, but not others.)
15727 - Remove some never-implemented options. Mark PathlenCoinWeight as
15729 - Implement proposal 106: Stop requiring clients to have well-formed
15730 certificates; stop checking nicknames in certificates. (Clients
15731 have certificates so that they can look like Tor servers, but in
15732 the future we might want to allow them to look like regular TLS
15733 clients instead. Nicknames in certificates serve no purpose other
15734 than making our protocol easier to recognize on the wire.)
15735 - Revise messages on handshake failure again to be even more clear about
15736 which are incoming connections and which are outgoing.
15737 - Discard any v1 directory info that's over 1 month old (for
15738 directories) or over 1 week old (for running-routers lists).
15739 - Do not warn when individual nodes in the configuration's EntryNodes,
15740 ExitNodes, etc are down: warn only when all possible nodes
15741 are down. (Fixes bug 348.)
15742 - Always remove expired routers and networkstatus docs before checking
15743 whether we have enough information to build circuits. (Fixes
15745 - Put a lower-bound on MaxAdvertisedBandwidth.
15748 Changes in version 0.1.2.7-alpha - 2007-02-06
15749 o Major bugfixes (rate limiting):
15750 - Servers decline directory requests much more aggressively when
15751 they're low on bandwidth. Otherwise they end up queueing more and
15752 more directory responses, which can't be good for latency.
15753 - But never refuse directory requests from local addresses.
15754 - Fix a memory leak when sending a 503 response for a networkstatus
15756 - Be willing to read or write on local connections (e.g. controller
15757 connections) even when the global rate limiting buckets are empty.
15758 - If our system clock jumps back in time, don't publish a negative
15759 uptime in the descriptor. Also, don't let the global rate limiting
15760 buckets go absurdly negative.
15761 - Flush local controller connection buffers periodically as we're
15762 writing to them, so we avoid queueing 4+ megabytes of data before
15765 o Major bugfixes (NT services):
15766 - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
15767 command-line flag so that admins can override the default by saying
15768 "tor --service install --user "SomeUser"". This will not affect
15769 existing installed services. Also, warn the user that the service
15770 will look for its configuration file in the service user's
15771 %appdata% directory. (We can't do the 'hardwire the user's appdata
15772 directory' trick any more, since we may not have read access to that
15775 o Major bugfixes (other):
15776 - Previously, we would cache up to 16 old networkstatus documents
15777 indefinitely, if they came from nontrusted authorities. Now we
15778 discard them if they are more than 10 days old.
15779 - Fix a crash bug in the presence of DNS hijacking (reported by Andrew
15781 - Detect and reject malformed DNS responses containing circular
15783 - If exits are rare enough that we're not marking exits as guards,
15784 ignore exit bandwidth when we're deciding the required bandwidth
15786 - When we're handling a directory connection tunneled over Tor,
15787 don't fill up internal memory buffers with all the data we want
15788 to tunnel; instead, only add it if the OR connection that will
15789 eventually receive it has some room for it. (This can lead to
15790 slowdowns in tunneled dir connections; a better solution will have
15791 to wait for 0.2.0.)
15793 o Minor bugfixes (dns):
15794 - Add some defensive programming to eventdns.c in an attempt to catch
15795 possible memory-stomping bugs.
15796 - Detect and reject DNS replies containing IPv4 or IPv6 records with
15797 an incorrect number of bytes. (Previously, we would ignore the
15799 - Fix as-yet-unused reverse IPv6 lookup code so it sends nybbles
15800 in the correct order, and doesn't crash.
15801 - Free memory held in recently-completed DNS lookup attempts on exit.
15802 This was not a memory leak, but may have been hiding memory leaks.
15803 - Handle TTL values correctly on reverse DNS lookups.
15804 - Treat failure to parse resolv.conf as an error.
15806 o Minor bugfixes (other):
15807 - Fix crash with "tor --list-fingerprint" (reported by seeess).
15808 - When computing clock skew from directory HTTP headers, consider what
15809 time it was when we finished asking for the directory, not what
15811 - Expire socks connections if they spend too long waiting for the
15812 handshake to finish. Previously we would let them sit around for
15813 days, if the connecting application didn't close them either.
15814 - And if the socks handshake hasn't started, don't send a
15815 "DNS resolve socks failed" handshake reply; just close it.
15816 - Stop using C functions that OpenBSD's linker doesn't like.
15817 - Don't launch requests for descriptors unless we have networkstatuses
15818 from at least half of the authorities. This delays the first
15819 download slightly under pathological circumstances, but can prevent
15820 us from downloading a bunch of descriptors we don't need.
15821 - Do not log IPs with TLS failures for incoming TLS
15822 connections. (Fixes bug 382.)
15823 - If the user asks to use invalid exit nodes, be willing to use
15825 - Stop using the reserved ac_cv namespace in our configure script.
15826 - Call stat() slightly less often; use fstat() when possible.
15827 - Refactor the way we handle pending circuits when an OR connection
15828 completes or fails, in an attempt to fix a rare crash bug.
15829 - Only rewrite a conn's address based on X-Forwarded-For: headers
15830 if it's a parseable public IP address; and stop adding extra quotes
15831 to the resulting address.
15834 - Weight directory requests by advertised bandwidth. Now we can
15835 let servers enable write limiting but still allow most clients to
15836 succeed at their directory requests. (We still ignore weights when
15837 choosing a directory authority; I hope this is a feature.)
15840 - Create a new file ReleaseNotes which was the old ChangeLog. The
15841 new ChangeLog file now includes the summaries for all development
15843 - Check for addresses with invalid characters at the exit as well
15844 as at the client, and warn less verbosely when they fail. You can
15845 override this by setting ServerDNSAllowNonRFC953Addresses to 1.
15846 - Adapt a patch from goodell to let the contrib/exitlist script
15847 take arguments rather than require direct editing.
15848 - Inform the server operator when we decide not to advertise a
15849 DirPort due to AccountingMax enabled or a low BandwidthRate. It
15850 was confusing Zax, so now we're hopefully more helpful.
15851 - Bring us one step closer to being able to establish an encrypted
15852 directory tunnel without knowing a descriptor first. Still not
15853 ready yet. As part of the change, now assume we can use a
15854 create_fast cell if we don't know anything about a router.
15855 - Allow exit nodes to use nameservers running on ports other than 53.
15856 - Servers now cache reverse DNS replies.
15857 - Add an --ignore-missing-torrc command-line option so that we can
15858 get the "use sensible defaults if the configuration file doesn't
15859 exist" behavior even when specifying a torrc location on the command
15862 o Minor features (controller):
15863 - Track reasons for OR connection failure; make these reasons
15864 available via the controller interface. (Patch from Mike Perry.)
15865 - Add a SOCKS_BAD_HOSTNAME client status event so controllers
15866 can learn when clients are sending malformed hostnames to Tor.
15867 - Clean up documentation for controller status events.
15868 - Add a REMAP status to stream events to note that a stream's
15869 address has changed because of a cached address or a MapAddress
15873 Changes in version 0.1.2.6-alpha - 2007-01-09
15875 - Fix an assert error introduced in 0.1.2.5-alpha: if a single TLS
15876 connection handles more than 4 gigs in either direction, we crash.
15877 - Fix an assert error introduced in 0.1.2.5-alpha: if we're an
15878 advertised exit node, somebody might try to exit from us when
15879 we're bootstrapping and before we've built our descriptor yet.
15880 Refuse the connection rather than crashing.
15883 - Warn if we (as a server) find that we've resolved an address that we
15884 weren't planning to resolve.
15885 - Warn that using select() on any libevent version before 1.1 will be
15886 unnecessarily slow (even for select()).
15887 - Flush ERR-level controller status events just like we currently
15888 flush ERR-level log events, so that a Tor shutdown doesn't prevent
15889 the controller from learning about current events.
15891 o Minor features (more controller status events):
15892 - Implement EXTERNAL_ADDRESS server status event so controllers can
15893 learn when our address changes.
15894 - Implement BAD_SERVER_DESCRIPTOR server status event so controllers
15895 can learn when directories reject our descriptor.
15896 - Implement SOCKS_UNKNOWN_PROTOCOL client status event so controllers
15897 can learn when a client application is speaking a non-socks protocol
15899 - Implement DANGEROUS_SOCKS client status event so controllers
15900 can learn when a client application is leaking DNS addresses.
15901 - Implement BUG general status event so controllers can learn when
15902 Tor is unhappy about its internal invariants.
15903 - Implement CLOCK_SKEW general status event so controllers can learn
15904 when Tor thinks the system clock is set incorrectly.
15905 - Implement GOOD_SERVER_DESCRIPTOR and ACCEPTED_SERVER_DESCRIPTOR
15906 server status events so controllers can learn when their descriptors
15907 are accepted by a directory.
15908 - Implement CHECKING_REACHABILITY and REACHABILITY_{SUCCEEDED|FAILED}
15909 server status events so controllers can learn about Tor's progress in
15910 deciding whether it's reachable from the outside.
15911 - Implement BAD_LIBEVENT general status event so controllers can learn
15912 when we have a version/method combination in libevent that needs to
15914 - Implement NAMESERVER_STATUS, NAMESERVER_ALL_DOWN, DNS_HIJACKED,
15915 and DNS_USELESS server status events so controllers can learn
15916 about changes to DNS server status.
15918 o Minor features (directory):
15919 - Authorities no longer recommend exits as guards if this would shift
15920 too much load to the exit nodes.
15923 Changes in version 0.1.2.5-alpha - 2007-01-06
15925 - Enable write limiting as well as read limiting. Now we sacrifice
15926 capacity if we're pushing out lots of directory traffic, rather
15927 than overrunning the user's intended bandwidth limits.
15928 - Include TLS overhead when counting bandwidth usage; previously, we
15929 would count only the bytes sent over TLS, but not the bytes used
15931 - Support running the Tor service with a torrc not in the same
15932 directory as tor.exe and default to using the torrc located in
15933 the %appdata%\Tor\ of the user who installed the service. Patch
15935 - Servers now check for the case when common DNS requests are going to
15936 wildcarded addresses (i.e. all getting the same answer), and change
15937 their exit policy to reject *:* if it's happening.
15938 - Implement BEGIN_DIR cells, so we can connect to the directory
15939 server via TLS to do encrypted directory requests rather than
15940 plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
15941 config options if you like.
15943 o Minor features (config and docs):
15944 - Start using the state file to store bandwidth accounting data:
15945 the bw_accounting file is now obsolete. We'll keep generating it
15946 for a while for people who are still using 0.1.2.4-alpha.
15947 - Try to batch changes to the state file so that we do as few
15948 disk writes as possible while still storing important things in
15950 - The state file and the bw_accounting file get saved less often when
15951 the AvoidDiskWrites config option is set.
15952 - Make PIDFile work on Windows (untested).
15953 - Add internal descriptions for a bunch of configuration options:
15954 accessible via controller interface and in comments in saved
15956 - Reject *:563 (NNTPS) in the default exit policy. We already reject
15957 NNTP by default, so this seems like a sensible addition.
15958 - Clients now reject hostnames with invalid characters. This should
15959 avoid some inadvertent info leaks. Add an option
15960 AllowNonRFC953Hostnames to disable this behavior, in case somebody
15961 is running a private network with hosts called @, !, and #.
15962 - Add a maintainer script to tell us which options are missing
15963 documentation: "make check-docs".
15964 - Add a new address-spec.txt document to describe our special-case
15965 addresses: .exit, .onion, and .noconnnect.
15967 o Minor features (DNS):
15968 - Ongoing work on eventdns infrastructure: now it has dns server
15969 and ipv6 support. One day Tor will make use of it.
15970 - Add client-side caching for reverse DNS lookups.
15971 - Add support to tor-resolve tool for reverse lookups and SOCKS5.
15972 - When we change nameservers or IP addresses, reset and re-launch
15973 our tests for DNS hijacking.
15975 o Minor features (directory):
15976 - Authorities now specify server versions in networkstatus. This adds
15977 about 2% to the size of compressed networkstatus docs, and allows
15978 clients to tell which servers support BEGIN_DIR and which don't.
15979 The implementation is forward-compatible with a proposed future
15980 protocol version scheme not tied to Tor versions.
15981 - DirServer configuration lines now have an orport= option so
15982 clients can open encrypted tunnels to the authorities without
15983 having downloaded their descriptors yet. Enabled for moria1,
15984 moria2, tor26, and lefkada now in the default configuration.
15985 - Directory servers are more willing to send a 503 "busy" if they
15986 are near their write limit, especially for v1 directory requests.
15987 Now they can use their limited bandwidth for actual Tor traffic.
15988 - Clients track responses with status 503 from dirservers. After a
15989 dirserver has given us a 503, we try not to use it until an hour has
15990 gone by, or until we have no dirservers that haven't given us a 503.
15991 - When we get a 503 from a directory, and we're not a server, we don't
15992 count the failure against the total number of failures allowed
15993 for the thing we're trying to download.
15994 - Report X-Your-Address-Is correctly from tunneled directory
15995 connections; don't report X-Your-Address-Is when it's an internal
15996 address; and never believe reported remote addresses when they're
15998 - Protect against an unlikely DoS attack on directory servers.
15999 - Add a BadDirectory flag to network status docs so that authorities
16000 can (eventually) tell clients about caches they believe to be
16003 o Minor features (controller):
16004 - Have GETINFO dir/status/* work on hosts with DirPort disabled.
16005 - Reimplement GETINFO so that info/names stays in sync with the
16007 - Implement "GETINFO fingerprint".
16008 - Implement "SETEVENTS GUARD" so controllers can get updates on
16009 entry guard status as it changes.
16011 o Minor features (clean up obsolete pieces):
16012 - Remove some options that have been deprecated since at least
16013 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
16014 SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
16015 to set log options.
16016 - We no longer look for identity and onion keys in "identity.key" and
16017 "onion.key" -- these were replaced by secret_id_key and
16018 secret_onion_key in 0.0.8pre1.
16019 - We no longer require unrecognized directory entries to be
16022 o Major bugfixes (security):
16023 - Stop sending the HttpProxyAuthenticator string to directory
16024 servers when directory connections are tunnelled through Tor.
16025 - Clients no longer store bandwidth history in the state file.
16026 - Do not log introduction points for hidden services if SafeLogging
16028 - When generating bandwidth history, round down to the nearest
16029 1k. When storing accounting data, round up to the nearest 1k.
16030 - When we're running as a server, remember when we last rotated onion
16031 keys, so that we will rotate keys once they're a week old even if
16032 we never stay up for a week ourselves.
16034 o Major bugfixes (other):
16035 - Fix a longstanding bug in eventdns that prevented the count of
16036 timed-out resolves from ever being reset. This bug caused us to
16037 give up on a nameserver the third time it timed out, and try it
16038 10 seconds later... and to give up on it every time it timed out
16040 - Take out the '5 second' timeout from the connection retry
16041 schedule. Now the first connect attempt will wait a full 10
16042 seconds before switching to a new circuit. Perhaps this will help
16043 a lot. Based on observations from Mike Perry.
16044 - Fix a bug on the Windows implementation of tor_mmap_file() that
16045 would prevent the cached-routers file from ever loading. Reported
16049 - Fix an assert failure when a directory authority sets
16050 AuthDirRejectUnlisted and then receives a descriptor from an
16051 unlisted router. Reported by seeess.
16052 - Avoid a double-free when parsing malformed DirServer lines.
16053 - Fix a bug when a BSD-style PF socket is first used. Patch from
16055 - Fix a bug in 0.1.2.2-alpha that prevented clients from asking
16056 to resolve an address at a given exit node even when they ask for
16058 - Servers no longer ever list themselves in their "family" line,
16059 even if configured to do so. This makes it easier to configure
16060 family lists conveniently.
16061 - When running as a server, don't fall back to 127.0.0.1 when no
16062 nameservers are configured in /etc/resolv.conf; instead, make the
16063 user fix resolv.conf or specify nameservers explicitly. (Resolves
16065 - Stop accepting certain malformed ports in configured exit policies.
16066 - Don't re-write the fingerprint file every restart, unless it has
16068 - Stop warning when a single nameserver fails: only warn when _all_ of
16069 our nameservers have failed. Also, when we only have one nameserver,
16070 raise the threshold for deciding that the nameserver is dead.
16071 - Directory authorities now only decide that routers are reachable
16072 if their identity keys are as expected.
16073 - When the user uses bad syntax in the Log config line, stop
16074 suggesting other bad syntax as a replacement.
16075 - Correctly detect ipv6 DNS capability on OpenBSD.
16077 o Minor bugfixes (controller):
16078 - Report the circuit number correctly in STREAM CLOSED events. Bug
16079 reported by Mike Perry.
16080 - Do not report bizarre values for results of accounting GETINFOs
16081 when the last second's write or read exceeds the allotted bandwidth.
16082 - Report "unrecognized key" rather than an empty string when the
16083 controller tries to fetch a networkstatus that doesn't exist.
16086 Changes in version 0.1.1.26 - 2006-12-14
16087 o Security bugfixes:
16088 - Stop sending the HttpProxyAuthenticator string to directory
16089 servers when directory connections are tunnelled through Tor.
16090 - Clients no longer store bandwidth history in the state file.
16091 - Do not log introduction points for hidden services if SafeLogging
16095 - Fix an assert failure when a directory authority sets
16096 AuthDirRejectUnlisted and then receives a descriptor from an
16097 unlisted router (reported by seeess).
16100 Changes in version 0.1.2.4-alpha - 2006-12-03
16102 - Add support for using natd; this allows FreeBSDs earlier than
16103 5.1.2 to have ipfw send connections through Tor without using
16104 SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
16107 - Make all connections to addresses of the form ".noconnect"
16108 immediately get closed. This lets application/controller combos
16109 successfully test whether they're talking to the same Tor by
16110 watching for STREAM events.
16111 - Make cross.sh cross-compilation script work even when autogen.sh
16112 hasn't been run. (Patch from Michael Mohr.)
16113 - Statistics dumped by -USR2 now include a breakdown of public key
16114 operations, for profiling.
16117 - Fix a major leak when directory authorities parse their
16118 approved-routers list, a minor memory leak when we fail to pick
16119 an exit node, and a few rare leaks on errors.
16120 - Handle TransPort connections even when the server sends data before
16121 the client sends data. Previously, the connection would just hang
16122 until the client sent data. (Patch from tup based on patch from
16124 - Avoid assert failure when our cached-routers file is empty on
16128 - Don't log spurious warnings when we see a circuit close reason we
16129 don't recognize; it's probably just from a newer version of Tor.
16130 - Have directory authorities allow larger amounts of drift in uptime
16131 without replacing the server descriptor: previously, a server that
16132 restarted every 30 minutes could have 48 "interesting" descriptors
16134 - Start linking to the Tor specification and Tor reference manual
16135 correctly in the Windows installer.
16136 - Add Vidalia to the OS X uninstaller script, so when we uninstall
16137 Tor/Privoxy we also uninstall Vidalia.
16138 - Resume building on Irix64, and fix a lot of warnings from its
16139 MIPSpro C compiler.
16140 - Don't corrupt last_guessed_ip in router_new_address_suggestion()
16141 when we're running as a client.
16144 Changes in version 0.1.1.25 - 2006-11-04
16146 - When a client asks us to resolve (rather than connect to)
16147 an address, and we have a cached answer, give them the cached
16148 answer. Previously, we would give them no answer at all.
16149 - We were building exactly the wrong circuits when we predict
16150 hidden service requirements, meaning Tor would have to build all
16151 its circuits on demand.
16152 - If none of our live entry guards have a high uptime, but we
16153 require a guard with a high uptime, try adding a new guard before
16154 we give up on the requirement. This patch should make long-lived
16155 connections more stable on average.
16156 - When testing reachability of our DirPort, don't launch new
16157 tests when there's already one in progress -- unreachable
16158 servers were stacking up dozens of testing streams.
16160 o Security bugfixes:
16161 - When the user sends a NEWNYM signal, clear the client-side DNS
16162 cache too. Otherwise we continue to act on previous information.
16165 - Avoid a memory corruption bug when creating a hash table for
16167 - Avoid possibility of controller-triggered crash when misusing
16168 certain commands from a v0 controller on platforms that do not
16169 handle printf("%s",NULL) gracefully.
16170 - Avoid infinite loop on unexpected controller input.
16171 - Don't log spurious warnings when we see a circuit close reason we
16172 don't recognize; it's probably just from a newer version of Tor.
16173 - Add Vidalia to the OS X uninstaller script, so when we uninstall
16174 Tor/Privoxy we also uninstall Vidalia.
16177 Changes in version 0.1.2.3-alpha - 2006-10-29
16179 - Prepare for servers to publish descriptors less often: never
16180 discard a descriptor simply for being too old until either it is
16181 recommended by no authorities, or until we get a better one for
16182 the same router. Make caches consider retaining old recommended
16183 routers for even longer.
16184 - If most authorities set a BadExit flag for a server, clients
16185 don't think of it as a general-purpose exit. Clients only consider
16186 authorities that advertise themselves as listing bad exits.
16187 - Directory servers now provide 'Pragma: no-cache' and 'Expires'
16188 headers for content, so that we can work better in the presence of
16189 caching HTTP proxies.
16190 - Allow authorities to list nodes as bad exits by fingerprint or by
16193 o Minor features, controller:
16194 - Add a REASON field to CIRC events; for backward compatibility, this
16195 field is sent only to controllers that have enabled the extended
16196 event format. Also, add additional reason codes to explain why
16197 a given circuit has been destroyed or truncated. (Patches from
16199 - Add a REMOTE_REASON field to extended CIRC events to tell the
16200 controller about why a remote OR told us to close a circuit.
16201 - Stream events also now have REASON and REMOTE_REASON fields,
16202 working much like those for circuit events.
16203 - There's now a GETINFO ns/... field so that controllers can ask Tor
16204 about the current status of a router.
16205 - A new event type "NS" to inform a controller when our opinion of
16206 a router's status has changed.
16207 - Add a GETINFO events/names and GETINFO features/names so controllers
16208 can tell which events and features are supported.
16209 - A new CLEARDNSCACHE signal to allow controllers to clear the
16210 client-side DNS cache without expiring circuits.
16212 o Security bugfixes:
16213 - When the user sends a NEWNYM signal, clear the client-side DNS
16214 cache too. Otherwise we continue to act on previous information.
16217 - Avoid sending junk to controllers or segfaulting when a controller
16218 uses EVENT_NEW_DESC with verbose nicknames.
16219 - Stop triggering asserts if the controller tries to extend hidden
16220 service circuits (reported by mwenge).
16221 - Avoid infinite loop on unexpected controller input.
16222 - When the controller does a "GETINFO network-status", tell it
16223 about even those routers whose descriptors are very old, and use
16224 long nicknames where appropriate.
16225 - Change NT service functions to be loaded on demand. This lets us
16226 build with MinGW without breaking Tor for Windows 98 users.
16227 - Do DirPort reachability tests less often, since a single test
16228 chews through many circuits before giving up.
16229 - In the hidden service example in torrc.sample, stop recommending
16230 esoteric and discouraged hidden service options.
16231 - When stopping an NT service, wait up to 10 sec for it to actually
16232 stop. Patch from Matt Edman; resolves bug 295.
16233 - Fix handling of verbose nicknames with ORCONN controller events:
16234 make them show up exactly when requested, rather than exactly when
16236 - When reporting verbose nicknames in entry_guards_getinfo(), avoid
16237 printing a duplicate "$" in the keys we send (reported by mwenge).
16238 - Correctly set maximum connection limit on Cygwin. (This time
16240 - Try to detect Windows correctly when cross-compiling.
16241 - Detect the size of the routers file correctly even if it is
16242 corrupted (on systems without mmap) or not page-aligned (on systems
16243 with mmap). This bug was harmless.
16244 - Sometimes we didn't bother sending a RELAY_END cell when an attempt
16245 to open a stream fails; now we do in more cases. This should
16246 make clients able to find a good exit faster in some cases, since
16247 unhandleable requests will now get an error rather than timing out.
16248 - Resolve two memory leaks when rebuilding the on-disk router cache
16249 (reported by fookoowa).
16250 - Clean up minor code warnings suggested by the MIPSpro C compiler,
16251 and reported by some Centos users.
16252 - Controller signals now work on non-Unix platforms that don't define
16253 SIGUSR1 and SIGUSR2 the way we expect.
16254 - Patch from Michael Mohr to contrib/cross.sh, so it checks more
16255 values before failing, and always enables eventdns.
16256 - Libevent-1.2 exports, but does not define in its headers, strlcpy.
16257 Try to fix this in configure.in by checking for most functions
16258 before we check for libevent.
16261 Changes in version 0.1.2.2-alpha - 2006-10-07
16263 - Make our async eventdns library on-by-default for Tor servers,
16264 and plan to deprecate the separate dnsworker threads.
16265 - Add server-side support for "reverse" DNS lookups (using PTR
16266 records so clients can determine the canonical hostname for a given
16267 IPv4 address). Only supported by servers using eventdns; servers
16268 now announce in their descriptors whether they support eventdns.
16269 - Specify and implement client-side SOCKS5 interface for reverse DNS
16270 lookups (see doc/socks-extensions.txt).
16271 - Add a BEGIN_DIR relay cell type for an easier in-protocol way to
16272 connect to directory servers through Tor. Previously, clients needed
16273 to find Tor exits to make private connections to directory servers.
16274 - Avoid choosing Exit nodes for entry or middle hops when the
16275 total bandwidth available from non-Exit nodes is much higher than
16276 the total bandwidth available from Exit nodes.
16277 - Workaround for name servers (like Earthlink's) that hijack failing
16278 DNS requests and replace the no-such-server answer with a "helpful"
16279 redirect to an advertising-driven search portal. Also work around
16280 DNS hijackers who "helpfully" decline to hijack known-invalid
16281 RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
16282 lets you turn it off.
16283 - Send out a burst of long-range padding cells once we've established
16284 that we're reachable. Spread them over 4 circuits, so hopefully
16285 a few will be fast. This exercises our bandwidth and bootstraps
16286 us into the directory more quickly.
16288 o New/improved config options:
16289 - Add new config option "ResolvConf" to let the server operator
16290 choose an alternate resolve.conf file when using eventdns.
16291 - Add an "EnforceDistinctSubnets" option to control our "exclude
16292 servers on the same /16" behavior. It's still on by default; this
16293 is mostly for people who want to operate private test networks with
16294 all the machines on the same subnet.
16295 - If one of our entry guards is on the ExcludeNodes list, or the
16296 directory authorities don't think it's a good guard, treat it as
16297 if it were unlisted: stop using it as a guard, and throw it off
16298 the guards list if it stays that way for a long time.
16299 - Allow directory authorities to be marked separately as authorities
16300 for the v1 directory protocol, the v2 directory protocol, and
16301 as hidden service directories, to make it easier to retire old
16302 authorities. V1 authorities should set "HSAuthoritativeDir 1"
16303 to continue being hidden service authorities too.
16304 - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
16306 o Minor features, controller:
16307 - Fix CIRC controller events so that controllers can learn the
16308 identity digests of non-Named servers used in circuit paths.
16309 - Let controllers ask for more useful identifiers for servers. Instead
16310 of learning identity digests for un-Named servers and nicknames
16311 for Named servers, the new identifiers include digest, nickname,
16312 and indication of Named status. Off by default; see control-spec.txt
16313 for more information.
16314 - Add a "getinfo address" controller command so it can display Tor's
16315 best guess to the user.
16316 - New controller event to alert the controller when our server
16317 descriptor has changed.
16318 - Give more meaningful errors on controller authentication failure.
16320 o Minor features, other:
16321 - When asked to resolve a hostname, don't use non-exit servers unless
16322 requested to do so. This allows servers with broken DNS to be
16323 useful to the network.
16324 - Divide eventdns log messages into warn and info messages.
16325 - Reserve the nickname "Unnamed" for routers that can't pick
16326 a hostname: any router can call itself Unnamed; directory
16327 authorities will never allocate Unnamed to any particular router;
16328 clients won't believe that any router is the canonical Unnamed.
16329 - Only include function names in log messages for info/debug messages.
16330 For notice/warn/err, the content of the message should be clear on
16331 its own, and printing the function name only confuses users.
16332 - Avoid some false positives during reachability testing: don't try
16333 to test via a server that's on the same /24 as us.
16334 - If we fail to build a circuit to an intended enclave, and it's
16335 not mandatory that we use that enclave, stop wanting it.
16336 - When eventdns is enabled, allow multithreaded builds on NetBSD and
16337 OpenBSD. (We had previously disabled threads on these platforms
16338 because they didn't have working thread-safe resolver functions.)
16340 o Major bugfixes, anonymity/security:
16341 - If a client asked for a server by name, and there's a named server
16342 in our network-status but we don't have its descriptor yet, we
16343 could return an unnamed server instead.
16344 - Fix NetBSD bug that could allow someone to force uninitialized RAM
16345 to be sent to a server's DNS resolver. This only affects NetBSD
16346 and other platforms that do not bounds-check tolower().
16347 - Reject (most) attempts to use Tor circuits with length one. (If
16348 many people start using Tor as a one-hop proxy, exit nodes become
16349 a more attractive target for compromise.)
16350 - Just because your DirPort is open doesn't mean people should be
16351 able to remotely teach you about hidden service descriptors. Now
16352 only accept rendezvous posts if you've got HSAuthoritativeDir set.
16354 o Major bugfixes, other:
16355 - Don't crash on race condition in dns.c: tor_assert(!resolve->expire)
16356 - When a client asks the server to resolve (not connect to)
16357 an address, and it has a cached answer, give them the cached answer.
16358 Previously, the server would give them no answer at all.
16359 - Allow really slow clients to not hang up five minutes into their
16360 directory downloads (suggested by Adam J. Richter).
16361 - We were building exactly the wrong circuits when we anticipated
16362 hidden service requirements, meaning Tor would have to build all
16363 its circuits on demand.
16364 - Avoid crashing when we mmap a router cache file of size 0.
16365 - When testing reachability of our DirPort, don't launch new
16366 tests when there's already one in progress -- unreachable
16367 servers were stacking up dozens of testing streams.
16369 o Minor bugfixes, correctness:
16370 - If we're a directory mirror and we ask for "all" network status
16371 documents, we would discard status documents from authorities
16372 we don't recognize.
16373 - Avoid a memory corruption bug when creating a hash table for
16375 - Avoid controller-triggered crash when misusing certain commands
16376 from a v0 controller on platforms that do not handle
16377 printf("%s",NULL) gracefully.
16378 - Don't crash when a controller sends a third argument to an
16379 "extendcircuit" request.
16380 - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
16381 response; fix error code when "getinfo dir/status/" fails.
16382 - Avoid crash when telling controller stream-status and a stream
16384 - Patch from Adam Langley to fix assert() in eventdns.c.
16385 - Fix a debug log message in eventdns to say "X resolved to Y"
16386 instead of "X resolved to X".
16387 - Make eventdns give strings for DNS errors, not just error numbers.
16388 - Track unreachable entry guards correctly: don't conflate
16389 'unreachable by us right now' with 'listed as down by the directory
16390 authorities'. With the old code, if a guard was unreachable by
16391 us but listed as running, it would clog our guard list forever.
16392 - Behave correctly in case we ever have a network with more than
16393 2GB/s total advertised capacity.
16394 - Make TrackExitHosts case-insensitive, and fix the behavior of
16395 ".suffix" TrackExitHosts items to avoid matching in the middle of
16397 - Finally fix the openssl warnings from newer gccs that believe that
16398 ignoring a return value is okay, but casting a return value and
16399 then ignoring it is a sign of madness.
16400 - Prevent the contrib/exitlist script from printing the same
16401 result more than once.
16402 - Patch from Steve Hildrey: Generate network status correctly on
16403 non-versioning dirservers.
16404 - Don't listen to the X-Your-Address-Is hint if you did the lookup
16405 via Tor; otherwise you'll think you're the exit node's IP address.
16407 o Minor bugfixes, performance:
16408 - Two small performance improvements on parsing descriptors.
16409 - Major performance improvement on inserting descriptors: change
16410 algorithm from O(n^2) to O(n).
16411 - Make the common memory allocation path faster on machines where
16412 malloc(0) returns a pointer.
16413 - Start remembering X-Your-Address-Is directory hints even if you're
16414 a client, so you can become a server more smoothly.
16415 - Avoid duplicate entries on MyFamily line in server descriptor.
16417 o Packaging, features:
16418 - Remove architecture from OS X builds. The official builds are
16419 now universal binaries.
16420 - The Debian package now uses --verify-config when (re)starting,
16421 to distinguish configuration errors from other errors.
16422 - Update RPMs to require libevent 1.1b.
16424 o Packaging, bugfixes:
16425 - Patches so Tor builds with MinGW on Windows.
16426 - Patches so Tor might run on Cygwin again.
16427 - Resume building on non-gcc compilers and ancient gcc. Resume
16428 building with the -O0 compile flag. Resume building cleanly on
16430 - Run correctly on OS X platforms with case-sensitive filesystems.
16431 - Correct includes for net/if.h and net/pfvar.h on OpenBSD (from Tup).
16432 - Add autoconf checks so Tor can build on Solaris x86 again.
16435 - Documented (and renamed) ServerDNSSearchDomains and
16436 ServerDNSResolvConfFile options.
16437 - Be clearer that the *ListenAddress directives can be repeated
16441 Changes in version 0.1.1.24 - 2006-09-29
16443 - Allow really slow clients to not hang up five minutes into their
16444 directory downloads (suggested by Adam J. Richter).
16445 - Fix major performance regression from 0.1.0.x: instead of checking
16446 whether we have enough directory information every time we want to
16447 do something, only check when the directory information has changed.
16448 This should improve client CPU usage by 25-50%.
16449 - Don't crash if, after a server has been running for a while,
16450 it can't resolve its hostname.
16453 - Allow Tor to start when RunAsDaemon is set but no logs are set.
16454 - Don't crash when the controller receives a third argument to an
16455 "extendcircuit" request.
16456 - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
16457 response; fix error code when "getinfo dir/status/" fails.
16458 - Fix configure.in to not produce broken configure files with
16459 more recent versions of autoconf. Thanks to Clint for his auto*
16461 - Fix security bug on NetBSD that could allow someone to force
16462 uninitialized RAM to be sent to a server's DNS resolver. This
16463 only affects NetBSD and other platforms that do not bounds-check
16465 - Warn user when using libevent 1.1a or earlier with win32 or kqueue
16466 methods: these are known to be buggy.
16467 - If we're a directory mirror and we ask for "all" network status
16468 documents, we would discard status documents from authorities
16469 we don't recognize.
16472 Changes in version 0.1.2.1-alpha - 2006-08-27
16474 - Add "eventdns" async dns library from Adam Langley, tweaked to
16475 build on OSX and Windows. Only enabled if you pass the
16476 --enable-eventdns argument to configure.
16477 - Allow servers with no hostname or IP address to learn their
16478 IP address by asking the directory authorities. This code only
16479 kicks in when you would normally have exited with a "no address"
16480 error. Nothing's authenticated, so use with care.
16481 - Rather than waiting a fixed amount of time between retrying
16482 application connections, we wait only 5 seconds for the first,
16483 10 seconds for the second, and 15 seconds for each retry after
16484 that. Hopefully this will improve the expected user experience.
16485 - Patch from Tup to add support for transparent AP connections:
16486 this basically bundles the functionality of trans-proxy-tor
16487 into the Tor mainline. Now hosts with compliant pf/netfilter
16488 implementations can redirect TCP connections straight to Tor
16489 without diverting through SOCKS. Needs docs.
16490 - Busy directory servers save lots of memory by spooling server
16491 descriptors, v1 directories, and v2 networkstatus docs to buffers
16492 as needed rather than en masse. Also mmap the cached-routers
16493 files, so we don't need to keep the whole thing in memory too.
16494 - Automatically avoid picking more than one node from the same
16495 /16 network when constructing a circuit.
16496 - Revise and clean up the torrc.sample that we ship with; add
16497 a section for BandwidthRate and BandwidthBurst.
16500 - Split circuit_t into origin_circuit_t and or_circuit_t, and
16501 split connection_t into edge, or, dir, control, and base structs.
16502 These will save quite a bit of memory on busy servers, and they'll
16503 also help us track down bugs in the code and bugs in the spec.
16504 - Experimentally re-enable kqueue on OSX when using libevent 1.1b
16505 or later. Log when we are doing this, so we can diagnose it when
16506 it fails. (Also, recommend libevent 1.1b for kqueue and
16507 win32 methods; deprecate libevent 1.0b harder; make libevent
16508 recommendation system saner.)
16509 - Start being able to build universal binaries on OS X (thanks
16511 - Export the default exit policy via the control port, so controllers
16512 don't need to guess what it is / will be later.
16513 - Add a man page entry for ProtocolWarnings.
16514 - Add TestVia config option to the man page.
16515 - Remove even more protocol-related warnings from Tor server logs,
16516 such as bad TLS handshakes and malformed begin cells.
16517 - Stop fetching descriptors if you're not a dir mirror and you
16518 haven't tried to establish any circuits lately. [This currently
16519 causes some dangerous behavior, because when you start up again
16520 you'll use your ancient server descriptors.]
16521 - New DirPort behavior: if you have your dirport set, you download
16522 descriptors aggressively like a directory mirror, whether or not
16523 your ORPort is set.
16524 - Get rid of the router_retry_connections notion. Now routers
16525 no longer try to rebuild long-term connections to directory
16526 authorities, and directory authorities no longer try to rebuild
16527 long-term connections to all servers. We still don't hang up
16528 connections in these two cases though -- we need to look at it
16529 more carefully to avoid flapping, and we likely need to wait til
16530 0.1.1.x is obsolete.
16531 - Drop compatibility with obsolete Tors that permit create cells
16532 to have the wrong circ_id_type.
16533 - Re-enable per-connection rate limiting. Get rid of the "OP
16534 bandwidth" concept. Lay groundwork for "bandwidth classes" --
16535 separate global buckets that apply depending on what sort of conn
16537 - Start publishing one minute or so after we find our ORPort
16538 to be reachable. This will help reduce the number of descriptors
16539 we have for ourselves floating around, since it's quite likely
16540 other things (e.g. DirPort) will change during that minute too.
16541 - Fork the v1 directory protocol into its own spec document,
16542 and mark dir-spec.txt as the currently correct (v2) spec.
16545 - When we find our DirPort to be reachable, publish a new descriptor
16546 so we'll tell the world (reported by pnx).
16547 - Publish a new descriptor after we hup/reload. This is important
16548 if our config has changed such that we'll want to start advertising
16549 our DirPort now, etc.
16550 - Allow Tor to start when RunAsDaemon is set but no logs are set.
16551 - When we have a state file we cannot parse, tell the user and
16552 move it aside. Now we avoid situations where the user starts
16553 Tor in 1904, Tor writes a state file with that timestamp in it,
16554 the user fixes her clock, and Tor refuses to start.
16555 - Fix configure.in to not produce broken configure files with
16556 more recent versions of autoconf. Thanks to Clint for his auto*
16558 - "tor --verify-config" now exits with -1(255) or 0 depending on
16559 whether the config options are bad or good.
16560 - Resolve bug 321 when using dnsworkers: append a period to every
16561 address we resolve at the exit node, so that we do not accidentally
16562 pick up local addresses, and so that failing searches are retried
16563 in the resolver search domains. (This is already solved for
16564 eventdns.) (This breaks Blossom servers for now.)
16565 - If we are using an exit enclave and we can't connect, e.g. because
16566 its webserver is misconfigured to not listen on localhost, then
16567 back off and try connecting from somewhere else before we fail.
16570 - Start compiling on MinGW on Windows (patches from Mike Chiussi).
16571 - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
16572 - Fix bug 314: Tor clients issued "unsafe socks" warnings even
16573 when the IP address is mapped through MapAddress to a hostname.
16574 - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
16575 useless IPv6 DNS resolves.
16576 - Patch suggested by Karsten Loesing: respond to SIGNAL command
16577 before we execute the signal, in case the signal shuts us down.
16578 - Clean up AllowInvalidNodes man page entry.
16579 - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
16580 - Add more asserts to track down an assert error on a windows Tor
16581 server with connection_add being called with socket == -1.
16582 - Handle reporting OR_CONN_EVENT_NEW events to the controller.
16583 - Fix misleading log messages: an entry guard that is "unlisted",
16584 as well as not known to be "down" (because we've never heard
16585 of it), is not therefore "up".
16586 - Remove code to special-case "-cvs" ending, since it has not
16587 actually mattered since 0.0.9.
16588 - Make our socks5 handling more robust to broken socks clients:
16589 throw out everything waiting on the buffer in between socks
16590 handshake phases, since they can't possibly (so the theory
16591 goes) have predicted what we plan to respond to them.
16594 Changes in version 0.1.1.23 - 2006-07-30
16596 - Fast Tor servers, especially exit nodes, were triggering asserts
16597 due to a bug in handling the list of pending DNS resolves. Some
16598 bugs still remain here; we're hunting them.
16599 - Entry guards could crash clients by sending unexpected input.
16600 - More fixes on reachability testing: if you find yourself reachable,
16601 then don't ever make any client requests (so you stop predicting
16602 circuits), then hup or have your clock jump, then later your IP
16603 changes, you won't think circuits are working, so you won't try to
16604 test reachability, so you won't publish.
16607 - Avoid a crash if the controller does a resetconf firewallports
16608 and then a setconf fascistfirewall=1.
16609 - Avoid an integer underflow when the dir authority decides whether
16610 a router is stable: we might wrongly label it stable, and compute
16611 a slightly wrong median stability, when a descriptor is published
16613 - Fix a place where we might trigger an assert if we can't build our
16614 own server descriptor yet.
16617 Changes in version 0.1.1.22 - 2006-07-05
16619 - Fix a big bug that was causing servers to not find themselves
16620 reachable if they changed IP addresses. Since only 0.1.1.22+
16621 servers can do reachability testing correctly, now we automatically
16622 make sure to test via one of these.
16623 - Fix to allow clients and mirrors to learn directory info from
16624 descriptor downloads that get cut off partway through.
16625 - Directory authorities had a bug in deciding if a newly published
16626 descriptor was novel enough to make everybody want a copy -- a few
16627 servers seem to be publishing new descriptors many times a minute.
16629 - Fix a rare bug that was causing some servers to complain about
16630 "closing wedged cpuworkers" and skip some circuit create requests.
16631 - Make the Exit flag in directory status documents actually work.
16634 Changes in version 0.1.1.21 - 2006-06-10
16635 o Crash and assert fixes from 0.1.1.20:
16636 - Fix a rare crash on Tor servers that have enabled hibernation.
16637 - Fix a seg fault on startup for Tor networks that use only one
16638 directory authority.
16639 - Fix an assert from a race condition that occurs on Tor servers
16640 while exiting, where various threads are trying to log that they're
16641 exiting, and delete the logs, at the same time.
16642 - Make our unit tests pass again on certain obscure platforms.
16645 - Add support for building SUSE RPM packages.
16646 - Speed up initial bootstrapping for clients: if we are making our
16647 first ever connection to any entry guard, then don't mark it down
16649 - When only one Tor server in the network is labelled as a guard,
16650 and we've already picked him, we would cycle endlessly picking him
16651 again, being unhappy about it, etc. Now we specifically exclude
16652 current guards when picking a new guard.
16653 - Servers send create cells more reliably after the TLS connection
16654 is established: we were sometimes forgetting to send half of them
16655 when we had more than one pending.
16656 - If we get a create cell that asks us to extend somewhere, but the
16657 Tor server there doesn't match the expected digest, we now send
16658 a destroy cell back, rather than silently doing nothing.
16659 - Make options->RedirectExit work again.
16660 - Make cookie authentication for the controller work again.
16661 - Stop being picky about unusual characters in the arguments to
16662 mapaddress. It's none of our business.
16663 - Add a new config option "TestVia" that lets you specify preferred
16664 middle hops to use for test circuits. Perhaps this will let me
16665 debug the reachability problems better.
16667 o Log / documentation fixes:
16668 - If we're a server and some peer has a broken TLS certificate, don't
16669 log about it unless ProtocolWarnings is set, i.e., we want to hear
16670 about protocol violations by others.
16671 - Fix spelling of VirtualAddrNetwork in man page.
16672 - Add a better explanation at the top of the autogenerated torrc file
16673 about what happened to our old torrc.
16676 Changes in version 0.1.1.20 - 2006-05-23
16678 - Downgrade a log severity where servers complain that they're
16680 - Avoid a compile warning on FreeBSD.
16681 - Remove string size limit on NEWDESC messages; solve bug 291.
16682 - Correct the RunAsDaemon entry in the man page; ignore RunAsDaemon
16683 more thoroughly when we're running on windows.
16686 Changes in version 0.1.1.19-rc - 2006-05-03
16688 - Regenerate our local descriptor if it's dirty and we try to use
16689 it locally (e.g. if it changes during reachability detection).
16690 - If we setconf our ORPort to 0, we continued to listen on the
16691 old ORPort and receive connections.
16692 - Avoid a second warning about machine/limits.h on Debian
16694 - Be willing to add our own routerinfo into the routerlist.
16695 Now authorities will include themselves in their directories
16696 and network-statuses.
16697 - Stop trying to upload rendezvous descriptors to every
16698 directory authority: only try the v1 authorities.
16699 - Servers no longer complain when they think they're not
16700 registered with the directory authorities. There were too many
16702 - Backport dist-rpm changes so rpms can be built without errors.
16705 - Implement an option, VirtualAddrMask, to set which addresses
16706 get handed out in response to mapaddress requests. This works
16707 around a bug in tsocks where 127.0.0.0/8 is never socksified.
16710 Changes in version 0.1.1.18-rc - 2006-04-10
16712 - Work harder to download live network-statuses from all the
16713 directory authorities we know about. Improve the threshold
16714 decision logic so we're more robust to edge cases.
16715 - When fetching rendezvous descriptors, we were willing to ask
16716 v2 authorities too, which would always return 404.
16719 - Stop listing down or invalid nodes in the v1 directory. This will
16720 reduce its bulk by about 1/3, and reduce load on directory
16722 - When deciding whether a router is Fast or Guard-worthy, consider
16723 his advertised BandwidthRate and not just the BandwidthCapacity.
16724 - No longer ship INSTALL and README files -- they are useless now.
16725 - Force rpmbuild to behave and honor target_cpu.
16726 - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
16727 - Start to include translated versions of the tor-doc-*.html
16728 files, along with the screenshots. Still needs more work.
16729 - Start sending back 512 and 451 errors if mapaddress fails,
16730 rather than not sending anything back at all.
16731 - When we fail to bind or listen on an incoming or outgoing
16732 socket, we should close it before failing. otherwise we just
16733 leak it. (thanks to weasel for finding.)
16734 - Allow "getinfo dir/status/foo" to work, as long as your DirPort
16735 is enabled. (This is a hack, and will be fixed in 0.1.2.x.)
16736 - Make NoPublish (even though deprecated) work again.
16737 - Fix a minor security flaw where a versioning auth dirserver
16738 could list a recommended version many times in a row to make
16739 clients more convinced that it's recommended.
16740 - Fix crash bug if there are two unregistered servers running
16741 with the same nickname, one of them is down, and you ask for
16742 them by nickname in your EntryNodes or ExitNodes. Also, try
16743 to pick the one that's running rather than an arbitrary one.
16744 - Fix an infinite loop we could hit if we go offline for too long.
16745 - Complain when we hit WSAENOBUFS on recv() or write() too.
16746 Perhaps this will help us hunt the bug.
16747 - If you're not a versioning dirserver, don't put the string
16748 "client-versions \nserver-versions \n" in your network-status.
16749 - Lower the minimum required number of file descriptors to 1000,
16750 so we can have some overhead for Valgrind on Linux, where the
16751 default ulimit -n is 1024.
16754 - Add tor.dizum.com as the fifth authoritative directory server.
16755 - Add a new config option FetchUselessDescriptors, off by default,
16756 for when you plan to run "exitlist" on your client and you want
16757 to know about even the non-running descriptors.
16760 Changes in version 0.1.1.17-rc - 2006-03-28
16762 - Clients and servers since 0.1.1.10-alpha have been expiring
16763 connections whenever they are idle for 5 minutes and they *do*
16764 have circuits on them. Oops. With this new version, clients will
16765 discard their previous entry guard choices and avoid choosing
16766 entry guards running these flawed versions.
16767 - Fix memory leak when uncompressing concatenated zlib streams. This
16768 was causing substantial leaks over time on Tor servers.
16769 - The v1 directory was including servers as much as 48 hours old,
16770 because that's how the new routerlist->routers works. Now only
16771 include them if they're 20 hours old or less.
16774 - Resume building on irix64, netbsd 2.0, etc.
16775 - On non-gcc compilers (e.g. solaris), use "-g -O" instead of
16777 - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
16778 and it is confusing some users.
16779 - Mirrors stop caching the v1 directory so often.
16780 - Make the max number of old descriptors that a cache will hold
16781 rise with the number of directory authorities, so we can scale.
16782 - Change our win32 uname() hack to be more forgiving about what
16783 win32 versions it thinks it's found.
16786 - Add lefkada.eecs.harvard.edu as a fourth authoritative directory
16788 - When the controller's *setconf commands fail, collect an error
16789 message in a string and hand it back to the controller.
16790 - Make the v2 dir's "Fast" flag based on relative capacity, just
16791 like "Stable" is based on median uptime. Name everything in the
16792 top 7/8 Fast, and only the top 1/2 gets to be a Guard.
16793 - Log server fingerprint on startup, so new server operators don't
16794 have to go hunting around their filesystem for it.
16795 - Return a robots.txt on our dirport to discourage google indexing.
16796 - Let the controller ask for GETINFO dir/status/foo so it can ask
16797 directly rather than connecting to the dir port. Only works when
16798 dirport is set for now.
16800 o New config options rather than constants in the code:
16801 - SocksTimeout: How long do we let a socks connection wait
16802 unattached before we fail it?
16803 - CircuitBuildTimeout: Cull non-open circuits that were born
16804 at least this many seconds ago.
16805 - CircuitIdleTimeout: Cull open clean circuits that were born
16806 at least this many seconds ago.
16809 Changes in version 0.1.1.16-rc - 2006-03-18
16810 o Bugfixes on 0.1.1.15-rc:
16811 - Fix assert when the controller asks to attachstream a connect-wait
16812 or resolve-wait stream.
16813 - Now do address rewriting when the controller asks us to attach
16814 to a particular circuit too. This will let Blossom specify
16815 "moria2.exit" without having to learn what moria2's IP address is.
16816 - Make the "tor --verify-config" command-line work again, so people
16817 can automatically check if their torrc will parse.
16818 - Authoritative dirservers no longer require an open connection from
16819 a server to consider him "reachable". We need this change because
16820 when we add new auth dirservers, old servers won't know not to
16822 - Let Tor build on Sun CC again.
16823 - Fix an off-by-one buffer size in dirserv.c that magically never
16824 hit our three authorities but broke sjmurdoch's own tor network.
16825 - If we as a directory mirror don't know of any v1 directory
16826 authorities, then don't try to cache any v1 directories.
16827 - Stop warning about unknown servers in our family when they are
16828 given as hex digests.
16829 - Stop complaining as quickly to the server operator that he
16830 hasn't registered his nickname/key binding.
16831 - Various cleanups so we can add new V2 Auth Dirservers.
16832 - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
16833 reflect the updated flags in our v2 dir protocol.
16834 - Resume allowing non-printable characters for exit streams (both
16835 for connecting and for resolving). Now we tolerate applications
16836 that don't follow the RFCs. But continue to block malformed names
16839 o Bugfixes on 0.1.0.x:
16840 - Fix assert bug in close_logs(): when we close and delete logs,
16841 remove them all from the global "logfiles" list.
16842 - Fix minor integer overflow in calculating when we expect to use up
16843 our bandwidth allocation before hibernating.
16844 - Fix a couple of bugs in OpenSSL detection. Also, deal better when
16845 there are multiple SSLs installed with different versions.
16846 - When we try to be a server and Address is not explicitly set and
16847 our hostname resolves to a private IP address, try to use an
16848 interface address if it has a public address. Now Windows machines
16849 that think of themselves as localhost can work by default.
16852 - Let the controller ask for GETINFO dir/server/foo so it can ask
16853 directly rather than connecting to the dir port.
16854 - Let the controller tell us about certain router descriptors
16855 that it doesn't want Tor to use in circuits. Implement
16856 SETROUTERPURPOSE and modify +POSTDESCRIPTOR to do this.
16857 - New config option SafeSocks to reject all application connections
16858 using unsafe socks protocols. Defaults to off.
16861 Changes in version 0.1.1.15-rc - 2006-03-11
16862 o Bugfixes and cleanups:
16863 - When we're printing strings from the network, don't try to print
16864 non-printable characters. This protects us against shell escape
16865 sequence exploits, and also against attacks to fool humans into
16866 misreading their logs.
16867 - Fix a bug where Tor would fail to establish any connections if you
16868 left it off for 24 hours and then started it: we were happy with
16869 the obsolete network statuses, but they all referred to router
16870 descriptors that were too old to fetch, so we ended up with no
16871 valid router descriptors.
16872 - Fix a seg fault in the controller's "getinfo orconn-status"
16873 command while listing status on incoming handshaking connections.
16874 Introduce a status name "NEW" for these connections.
16875 - If we get a linelist or linelist_s config option from the torrc
16876 (e.g. ExitPolicy) and it has no value, warn and skip rather than
16877 silently resetting it to its default.
16878 - Don't abandon entry guards until they've been down or gone for
16880 - Cleaner and quieter log messages.
16883 - New controller signal NEWNYM that makes new application requests
16884 use clean circuits.
16885 - Add a new circuit purpose 'controller' to let the controller ask
16886 for a circuit that Tor won't try to use. Extend the EXTENDCIRCUIT
16887 controller command to let you specify the purpose if you're
16888 starting a new circuit. Add a new SETCIRCUITPURPOSE controller
16889 command to let you change a circuit's purpose after it's been
16891 - Accept "private:*" in routerdesc exit policies; not generated yet
16892 because older Tors do not understand it.
16893 - Add BSD-style contributed startup script "rc.subr" from Peter
16897 Changes in version 0.1.1.14-alpha - 2006-02-20
16898 o Bugfixes on 0.1.1.x:
16899 - Don't die if we ask for a stdout or stderr log (even implicitly)
16900 and we're set to RunAsDaemon -- just warn.
16901 - We still had a few bugs in the OR connection rotation code that
16902 caused directory servers to slowly aggregate connections to other
16903 fast Tor servers. This time for sure!
16904 - Make log entries on Win32 include the name of the function again.
16905 - We were treating a pair of exit policies if they were equal even
16906 if one said accept and the other said reject -- causing us to
16907 not always publish a new descriptor since we thought nothing
16909 - Retry pending server downloads as well as pending networkstatus
16910 downloads when we unexpectedly get a socks request.
16911 - We were ignoring the IS_FAST flag in the directory status,
16912 meaning we were willing to pick trivial-bandwidth nodes for "fast"
16914 - If the controller's SAVECONF command fails (e.g. due to file
16915 permissions), let the controller know that it failed.
16918 - If we're trying to be a Tor server and running Windows 95/98/ME
16919 as a server, explain that we'll likely crash.
16920 - When we're a server, a client asks for an old-style directory,
16921 and our write bucket is empty, don't give it to him. This way
16922 small servers can continue to serve the directory *sometimes*,
16923 without getting overloaded.
16924 - Compress exit policies even more -- look for duplicate lines
16926 - Clients now honor the "guard" flag in the router status when
16927 picking entry guards, rather than looking at is_fast or is_stable.
16928 - Retain unrecognized lines in $DATADIR/state file, so that we can
16929 be forward-compatible.
16930 - Generate 18.0.0.0/8 address policy format in descs when we can;
16931 warn when the mask is not reducible to a bit-prefix.
16932 - Let the user set ControlListenAddress in the torrc. This can be
16933 dangerous, but there are some cases (like a secured LAN) where it
16935 - Split ReachableAddresses into ReachableDirAddresses and
16936 ReachableORAddresses, so we can restrict Dir conns to port 80
16937 and OR conns to port 443.
16938 - Now we can target arch and OS in rpm builds (contributed by
16939 Phobos). Also make the resulting dist-rpm filename match the
16941 - New config options to help controllers: FetchServerDescriptors
16942 and FetchHidServDescriptors for whether to fetch server
16943 info and hidserv info or let the controller do it, and
16944 PublishServerDescriptor and PublishHidServDescriptors.
16945 - Also let the controller set the __AllDirActionsPrivate config
16946 option if you want all directory fetches/publishes to happen via
16947 Tor (it assumes your controller bootstraps your circuits).
16950 Changes in version 0.1.0.17 - 2006-02-17
16951 o Crash bugfixes on 0.1.0.x:
16952 - When servers with a non-zero DirPort came out of hibernation,
16953 sometimes they would trigger an assert.
16955 o Other important bugfixes:
16956 - On platforms that don't have getrlimit (like Windows), we were
16957 artificially constraining ourselves to a max of 1024
16958 connections. Now just assume that we can handle as many as 15000
16959 connections. Hopefully this won't cause other problems.
16961 o Backported features:
16962 - When we're a server, a client asks for an old-style directory,
16963 and our write bucket is empty, don't give it to him. This way
16964 small servers can continue to serve the directory *sometimes*,
16965 without getting overloaded.
16966 - Whenever you get a 503 in response to a directory fetch, try
16967 once more. This will become important once servers start sending
16968 503's whenever they feel busy.
16969 - Fetch a new directory every 120 minutes, not every 40 minutes.
16970 Now that we have hundreds of thousands of users running the old
16971 directory algorithm, it's starting to hurt a lot.
16972 - Bump up the period for forcing a hidden service descriptor upload
16973 from 20 minutes to 1 hour.
16976 Changes in version 0.1.1.13-alpha - 2006-02-09
16977 o Crashes in 0.1.1.x:
16978 - When you tried to setconf ORPort via the controller, Tor would
16979 crash. So people using TorCP to become a server were sad.
16980 - Solve (I hope) the stack-smashing bug that we were seeing on fast
16981 servers. The problem appears to be something do with OpenSSL's
16982 random number generation, or how we call it, or something. Let me
16983 know if the crashes continue.
16984 - Turn crypto hardware acceleration off by default, until we find
16985 somebody smart who can test it for us. (It appears to produce
16986 seg faults in at least some cases.)
16987 - Fix a rare assert error when we've tried all intro points for
16988 a hidden service and we try fetching the service descriptor again:
16989 "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed"
16992 - Fix a major load balance bug: we were round-robining in 16 KB
16993 chunks, and servers with bandwidthrate of 20 KB, while downloading
16994 a 600 KB directory, would starve their other connections. Now we
16995 try to be a bit more fair.
16996 - Dir authorities and mirrors were never expiring the newest
16997 descriptor for each server, causing memory and directory bloat.
16998 - Fix memory-bloating and connection-bloating bug on servers: We
16999 were never closing any connection that had ever had a circuit on
17000 it, because we were checking conn->n_circuits == 0, yet we had a
17001 bug that let it go negative.
17002 - Make Tor work using squid as your http proxy again -- squid
17003 returns an error if you ask for a URL that's too long, and it uses
17004 a really generic error message. Plus, many people are behind a
17005 transparent squid so they don't even realize it.
17006 - On platforms that don't have getrlimit (like Windows), we were
17007 artificially constraining ourselves to a max of 1024
17008 connections. Now just assume that we can handle as many as 15000
17009 connections. Hopefully this won't cause other problems.
17010 - Add a new config option ExitPolicyRejectPrivate which defaults to
17011 1. This means all exit policies will begin with rejecting private
17012 addresses, unless the server operator explicitly turns it off.
17015 - Clients no longer download descriptors for non-running
17017 - Before we add new directory authorities, we should make it
17018 clear that only v1 authorities should receive/publish hidden
17019 service descriptors.
17022 - As soon as we've fetched some more directory info, immediately
17023 try to download more server descriptors. This way we don't have
17024 a 10 second pause during initial bootstrapping.
17025 - Remove even more loud log messages that the server operator can't
17027 - When we're running an obsolete or un-recommended version, make
17028 the log message more clear about what the problem is and what
17029 versions *are* still recommended.
17030 - Provide a more useful warn message when our onion queue gets full:
17031 the CPU is too slow or the exit policy is too liberal.
17032 - Don't warn when we receive a 503 from a dirserver/cache -- this
17033 will pave the way for them being able to refuse if they're busy.
17034 - When we fail to bind a listener, try to provide a more useful
17035 log message: e.g., "Is Tor already running?"
17036 - Adjust tor-spec to parameterize cell and key lengths. Now Ian
17037 Goldberg can prove things about our handshake protocol more
17039 - MaxConn has been obsolete for a while now. Document the ConnLimit
17040 config option, which is a *minimum* number of file descriptors
17041 that must be available else Tor refuses to start.
17042 - Apply Matt Ghali's --with-syslog-facility patch to ./configure
17043 if you log to syslog and want something other than LOG_DAEMON.
17044 - Make dirservers generate a separate "guard" flag to mean,
17045 "would make a good entry guard". Make clients parse it and vote
17046 on it. Not used by clients yet.
17047 - Implement --with-libevent-dir option to ./configure. Also, improve
17048 search techniques to find libevent, and use those for openssl too.
17049 - Bump the default bandwidthrate to 3 MB, and burst to 6 MB
17050 - Only start testing reachability once we've established a
17051 circuit. This will make startup on dirservers less noisy.
17052 - Don't try to upload hidden service descriptors until we have
17053 established a circuit.
17054 - Fix the controller's "attachstream 0" command to treat conn like
17055 it just connected, doing address remapping, handling .exit and
17056 .onion idioms, and so on. Now we're more uniform in making sure
17057 that the controller hears about new and closing connections.
17060 Changes in version 0.1.1.12-alpha - 2006-01-11
17061 o Bugfixes on 0.1.1.x:
17062 - The fix to close duplicate server connections was closing all
17063 Tor client connections if they didn't establish a circuit
17064 quickly enough. Oops.
17065 - Fix minor memory issue (double-free) that happened on exit.
17067 o Bugfixes on 0.1.0.x:
17068 - Tor didn't warn when it failed to open a log file.
17071 Changes in version 0.1.1.11-alpha - 2006-01-10
17072 o Crashes in 0.1.1.x:
17073 - Include all the assert/crash fixes from 0.1.0.16.
17074 - If you start Tor and then quit very quickly, there were some
17075 races that tried to free things that weren't allocated yet.
17076 - Fix a rare memory stomp if you're running hidden services.
17077 - Fix segfault when specifying DirServer in config without nickname.
17078 - Fix a seg fault when you finish connecting to a server but at
17079 that moment you dump his server descriptor.
17080 - Extendcircuit and Attachstream controller commands would
17081 assert/crash if you don't give them enough arguments.
17082 - Fix an assert error when we're out of space in the connection_list
17083 and we try to post a hidden service descriptor (reported by weasel).
17084 - If you specify a relative torrc path and you set RunAsDaemon in
17085 your torrc, then it chdir()'s to the new directory. If you HUP,
17086 it tries to load the new torrc location, fails, and exits.
17087 The fix: no longer allow a relative path to torrc using -f.
17090 - Implement "entry guards": automatically choose a handful of entry
17091 nodes and stick with them for all circuits. Only pick new guards
17092 when the ones you have are unsuitable, and if the old guards
17093 become suitable again, switch back. This will increase security
17094 dramatically against certain end-point attacks. The EntryNodes
17095 config option now provides some hints about which entry guards you
17096 want to use most; and StrictEntryNodes means to only use those.
17097 - New directory logic: download by descriptor digest, not by
17098 fingerprint. Caches try to download all listed digests from
17099 authorities; clients try to download "best" digests from caches.
17100 This avoids partitioning and isolating attacks better.
17101 - Make the "stable" router flag in network-status be the median of
17102 the uptimes of running valid servers, and make clients pay
17103 attention to the network-status flags. Thus the cutoff adapts
17104 to the stability of the network as a whole, making IRC, IM, etc
17105 connections more reliable.
17108 - Tor servers with dynamic IP addresses were needing to wait 18
17109 hours before they could start doing reachability testing using
17110 the new IP address and ports. This is because they were using
17111 the internal descriptor to learn what to test, yet they were only
17112 rebuilding the descriptor once they decided they were reachable.
17113 - Tor 0.1.1.9 and 0.1.1.10 had a serious bug that caused clients
17114 to download certain server descriptors, throw them away, and then
17115 fetch them again after 30 minutes. Now mirrors throw away these
17116 server descriptors so clients can't get them.
17117 - We were leaving duplicate connections to other ORs open for a week,
17118 rather than closing them once we detect a duplicate. This only
17119 really affected authdirservers, but it affected them a lot.
17120 - Spread the authdirservers' reachability testing over the entire
17121 testing interval, so we don't try to do 500 TLS's at once every
17125 - If the network is down, and we try to connect to a conn because
17126 we have a circuit in mind, and we timeout (30 seconds) because the
17127 network never answers, we were expiring the circuit, but we weren't
17128 obsoleting the connection or telling the entry_guards functions.
17129 - Some Tor servers process billions of cells per day. These statistics
17130 need to be uint64_t's.
17131 - Check for integer overflows in more places, when adding elements
17132 to smartlists. This could possibly prevent a buffer overflow
17133 on malicious huge inputs. I don't see any, but I haven't looked
17135 - ReachableAddresses kept growing new "reject *:*" lines on every
17137 - When you "setconf log" via the controller, it should remove all
17138 logs. We were automatically adding back in a "log notice stdout".
17139 - Newly bootstrapped Tor networks couldn't establish hidden service
17140 circuits until they had nodes with high uptime. Be more tolerant.
17141 - We were marking servers down when they could not answer every piece
17142 of the directory request we sent them. This was far too harsh.
17143 - Fix the torify (tsocks) config file to not use Tor for localhost
17145 - Directory authorities now go to the proper authority when asking for
17146 a networkstatus, even when they want a compressed one.
17147 - Fix a harmless bug that was causing Tor servers to log
17148 "Got an end because of misc error, but we're not an AP. Closing."
17149 - Authorities were treating their own descriptor changes as cosmetic,
17150 meaning the descriptor available in the network-status and the
17151 descriptor that clients downloaded were different.
17152 - The OS X installer was adding a symlink for tor_resolve but
17153 the binary was called tor-resolve (reported by Thomas Hardly).
17154 - Workaround a problem with some http proxies where they refuse GET
17155 requests that specify "Content-Length: 0" (reported by Adrian).
17156 - Fix wrong log message when you add a "HiddenServiceNodes" config
17157 line without any HiddenServiceDir line (reported by Chris Thomas).
17160 - Write the TorVersion into the state file so we have a prayer of
17161 keeping forward and backward compatibility.
17162 - Revive the FascistFirewall config option rather than eliminating it:
17163 now it's a synonym for ReachableAddresses *:80,*:443.
17164 - Clients choose directory servers from the network status lists,
17165 not from their internal list of router descriptors. Now they can
17166 go to caches directly rather than needing to go to authorities
17168 - Directory authorities ignore router descriptors that have only
17169 cosmetic differences: do this for 0.1.0.x servers now too.
17170 - Add a new flag to network-status indicating whether the server
17171 can answer v2 directory requests too.
17172 - Authdirs now stop whining so loudly about bad descriptors that
17173 they fetch from other dirservers. So when there's a log complaint,
17174 it's for sure from a freshly uploaded descriptor.
17175 - Reduce memory requirements in our structs by changing the order
17177 - There used to be two ways to specify your listening ports in a
17178 server descriptor: on the "router" line and with a separate "ports"
17179 line. Remove support for the "ports" line.
17180 - New config option "AuthDirRejectUnlisted" for auth dirservers as
17181 a panic button: if we get flooded with unusable servers we can
17182 revert to only listing servers in the approved-routers file.
17183 - Auth dir servers can now mark a fingerprint as "!reject" or
17184 "!invalid" in the approved-routers file (as its nickname), to
17185 refuse descriptors outright or include them but marked as invalid.
17186 - Servers store bandwidth history across restarts/crashes.
17187 - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
17188 get a better idea of why their circuits failed. Not used yet.
17189 - Directory mirrors now cache up to 16 unrecognized network-status
17190 docs. Now we can add new authdirservers and they'll be cached too.
17191 - When picking a random directory, prefer non-authorities if any
17193 - New controller option "getinfo desc/all-recent" to fetch the
17194 latest server descriptor for every router that Tor knows about.
17197 Changes in version 0.1.0.16 - 2006-01-02
17198 o Crash bugfixes on 0.1.0.x:
17199 - On Windows, build with a libevent patch from "I-M Weasel" to avoid
17200 corrupting the heap, losing FDs, or crashing when we need to resize
17201 the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
17202 - It turns out sparc64 platforms crash on unaligned memory access
17203 too -- so detect and avoid this.
17204 - Handle truncated compressed data correctly (by detecting it and
17206 - Fix possible-but-unlikely free(NULL) in control.c.
17207 - When we were closing connections, there was a rare case that
17208 stomped on memory, triggering seg faults and asserts.
17209 - Avoid potential infinite recursion when building a descriptor. (We
17210 don't know that it ever happened, but better to fix it anyway.)
17211 - We were neglecting to unlink marked circuits from soon-to-close OR
17212 connections, which caused some rare scribbling on freed memory.
17213 - Fix a memory stomping race bug when closing the joining point of two
17214 rendezvous circuits.
17215 - Fix an assert in time parsing found by Steven Murdoch.
17217 o Other bugfixes on 0.1.0.x:
17218 - When we're doing reachability testing, provide more useful log
17219 messages so the operator knows what to expect.
17220 - Do not check whether DirPort is reachable when we are suppressing
17221 advertising it because of hibernation.
17222 - When building with -static or on Solaris, we sometimes needed -ldl.
17223 - When we're deciding whether a stream has enough circuits around
17224 that can handle it, count the freshly dirty ones and not the ones
17225 that are so dirty they won't be able to handle it.
17226 - When we're expiring old circuits, we had a logic error that caused
17227 us to close new rendezvous circuits rather than old ones.
17228 - Give a more helpful log message when you try to change ORPort via
17229 the controller: you should upgrade Tor if you want that to work.
17230 - We were failing to parse Tor versions that start with "Tor ".
17231 - Tolerate faulty streams better: when a stream fails for reason
17232 exitpolicy, stop assuming that the router is lying about his exit
17233 policy. When a stream fails for reason misc, allow it to retry just
17234 as if it was resolvefailed. When a stream has failed three times,
17235 reset its failure count so we can try again and get all three tries.
17238 Changes in version 0.1.1.10-alpha - 2005-12-11
17239 o Correctness bugfixes on 0.1.0.x:
17240 - On Windows, build with a libevent patch from "I-M Weasel" to avoid
17241 corrupting the heap, losing FDs, or crashing when we need to resize
17242 the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
17243 - Stop doing the complex voodoo overkill checking for insecure
17244 Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
17245 - When we were closing connections, there was a rare case that
17246 stomped on memory, triggering seg faults and asserts.
17247 - We were neglecting to unlink marked circuits from soon-to-close OR
17248 connections, which caused some rare scribbling on freed memory.
17249 - When we're deciding whether a stream has enough circuits around
17250 that can handle it, count the freshly dirty ones and not the ones
17251 that are so dirty they won't be able to handle it.
17252 - Recover better from TCP connections to Tor servers that are
17253 broken but don't tell you (it happens!); and rotate TLS
17254 connections once a week.
17255 - When we're expiring old circuits, we had a logic error that caused
17256 us to close new rendezvous circuits rather than old ones.
17257 - Fix a scary-looking but apparently harmless bug where circuits
17258 would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
17259 servers, and never switch to state CIRCUIT_STATE_OPEN.
17260 - When building with -static or on Solaris, we sometimes needed to
17262 - Give a useful message when people run Tor as the wrong user,
17263 rather than telling them to start chowning random directories.
17264 - We were failing to inform the controller about new .onion streams.
17266 o Security bugfixes on 0.1.0.x:
17267 - Refuse server descriptors if the fingerprint line doesn't match
17268 the included identity key. Tor doesn't care, but other apps (and
17269 humans) might actually be trusting the fingerprint line.
17270 - We used to kill the circuit when we receive a relay command we
17271 don't recognize. Now we just drop it.
17272 - Start obeying our firewall options more rigorously:
17273 . If we can't get to a dirserver directly, try going via Tor.
17274 . Don't ever try to connect (as a client) to a place our
17275 firewall options forbid.
17276 . If we specify a proxy and also firewall options, obey the
17277 firewall options even when we're using the proxy: some proxies
17278 can only proxy to certain destinations.
17279 - Fix a bug found by Lasse Overlier: when we were making internal
17280 circuits (intended to be cannibalized later for rendezvous and
17281 introduction circuits), we were picking them so that they had
17282 useful exit nodes. There was no need for this, and it actually
17283 aids some statistical attacks.
17284 - Start treating internal circuits and exit circuits separately.
17285 It's important to keep them separate because internal circuits
17286 have their last hops picked like middle hops, rather than like
17287 exit hops. So exiting on them will break the user's expectations.
17289 o Bugfixes on 0.1.1.x:
17290 - Take out the mis-feature where we tried to detect IP address
17291 flapping for people with DynDNS, and chose not to upload a new
17292 server descriptor sometimes.
17293 - Try to be compatible with OpenSSL 0.9.6 again.
17294 - Log fix: when the controller is logging about .onion addresses,
17295 sometimes it didn't include the ".onion" part of the address.
17296 - Don't try to modify options->DirServers internally -- if the
17297 user didn't specify any, just add the default ones directly to
17298 the trusted dirserver list. This fixes a bug where people running
17299 controllers would use SETCONF on some totally unrelated config
17300 option, and Tor would start yelling at them about changing their
17302 - Let the controller's redirectstream command specify a port, in
17303 case the controller wants to change that too.
17304 - When we requested a pile of server descriptors, we sometimes
17305 accidentally launched a duplicate request for the first one.
17306 - Bugfix for trackhostexits: write down the fingerprint of the
17307 chosen exit, not its nickname, because the chosen exit might not
17309 - When parsing foo.exit, if foo is unknown, and we are leaving
17310 circuits unattached, set the chosen_exit field and leave the
17311 address empty. This matters because controllers got confused
17313 - Directory authorities no longer try to download server
17314 descriptors that they know they will reject.
17316 o Features and updates:
17317 - Replace balanced trees with hash tables: this should make stuff
17318 significantly faster.
17319 - Resume using the AES counter-mode implementation that we ship,
17320 rather than OpenSSL's. Ours is significantly faster.
17321 - Many other CPU and memory improvements.
17322 - Add a new config option FastFirstHopPK (on by default) so clients
17323 do a trivial crypto handshake for their first hop, since TLS has
17324 already taken care of confidentiality and authentication.
17325 - Add a new config option TestSocks so people can see if their
17326 applications are using socks4, socks4a, socks5-with-ip, or
17327 socks5-with-hostname. This way they don't have to keep mucking
17328 with tcpdump and wondering if something got cached somewhere.
17329 - Warn when listening on a public address for socks. I suspect a
17330 lot of people are setting themselves up as open socks proxies,
17331 and they have no idea that jerks on the Internet are using them,
17332 since they simply proxy the traffic into the Tor network.
17333 - Add "private:*" as an alias in configuration for policies. Now
17334 you can simplify your exit policy rather than needing to list
17335 every single internal or nonroutable network space.
17336 - Add a new controller event type that allows controllers to get
17337 all server descriptors that were uploaded to a router in its role
17338 as authoritative dirserver.
17339 - Start shipping socks-extensions.txt, tor-doc-unix.html,
17340 tor-doc-server.html, and stylesheet.css in the tarball.
17341 - Stop shipping tor-doc.html in the tarball.
17344 Changes in version 0.1.1.9-alpha - 2005-11-15
17345 o Usability improvements:
17346 - Start calling it FooListenAddress rather than FooBindAddress,
17347 since few of our users know what it means to bind an address
17349 - Reduce clutter in server logs. We're going to try to make
17350 them actually usable now. New config option ProtocolWarnings that
17351 lets you hear about how _other Tors_ are breaking the protocol. Off
17353 - Divide log messages into logging domains. Once we put some sort
17354 of interface on this, it will let people looking at more verbose
17355 log levels specify the topics they want to hear more about.
17356 - Make directory servers return better http 404 error messages
17357 instead of a generic "Servers unavailable".
17358 - Check for even more Windows version flags when writing the platform
17359 string in server descriptors, and note any we don't recognize.
17360 - Clean up more of the OpenSSL memory when exiting, so we can detect
17361 memory leaks better.
17362 - Make directory authorities be non-versioning, non-naming by
17363 default. Now we can add new directory servers without requiring
17364 their operators to pay close attention.
17365 - When logging via syslog, include the pid whenever we provide
17366 a log entry. Suggested by Todd Fries.
17368 o Performance improvements:
17369 - Directory servers now silently throw away new descriptors that
17370 haven't changed much if the timestamps are similar. We do this to
17371 tolerate older Tor servers that upload a new descriptor every 15
17372 minutes. (It seemed like a good idea at the time.)
17373 - Inline bottleneck smartlist functions; use fast versions by default.
17374 - Add a "Map from digest to void*" abstraction digestmap_t so we
17375 can do less hex encoding/decoding. Use it in router_get_by_digest()
17376 to resolve a performance bottleneck.
17377 - Allow tor_gzip_uncompress to extract as much as possible from
17378 truncated compressed data. Try to extract as many
17379 descriptors as possible from truncated http responses (when
17380 DIR_PURPOSE_FETCH_ROUTERDESC).
17381 - Make circ->onionskin a pointer, not a static array. moria2 was using
17382 125000 circuit_t's after it had been up for a few weeks, which
17383 translates to 20+ megs of wasted space.
17384 - The private half of our EDH handshake keys are now chosen out
17385 of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
17387 o Security improvements:
17388 - Start making directory caches retain old routerinfos, so soon
17389 clients can start asking by digest of descriptor rather than by
17390 fingerprint of server.
17391 - Add half our entropy from RAND_poll in OpenSSL. This knows how
17392 to use egd (if present), openbsd weirdness (if present), vms/os2
17393 weirdness (if we ever port there), and more in the future.
17395 o Bugfixes on 0.1.0.x:
17396 - Do round-robin writes of at most 16 kB per write. This might be
17397 more fair on loaded Tor servers, and it might resolve our Windows
17398 crash bug. It might also slow things down.
17399 - Our TLS handshakes were generating a single public/private
17400 keypair for the TLS context, rather than making a new one for
17401 each new connections. Oops. (But we were still rotating them
17402 periodically, so it's not so bad.)
17403 - When we were cannibalizing a circuit with a particular exit
17404 node in mind, we weren't checking to see if that exit node was
17405 already present earlier in the circuit. Oops.
17406 - When a Tor server's IP changes (e.g. from a dyndns address),
17407 upload a new descriptor so clients will learn too.
17408 - Really busy servers were keeping enough circuits open on stable
17409 connections that they were wrapping around the circuit_id
17410 space. (It's only two bytes.) This exposed a bug where we would
17411 feel free to reuse a circuit_id even if it still exists but has
17412 been marked for close. Try to fix this bug. Some bug remains.
17413 - If we would close a stream early (e.g. it asks for a .exit that
17414 we know would refuse it) but the LeaveStreamsUnattached config
17415 option is set by the controller, then don't close it.
17417 o Bugfixes on 0.1.1.8-alpha:
17418 - Fix a big pile of memory leaks, some of them serious.
17419 - Do not try to download a routerdesc if we would immediately reject
17421 - Resume inserting a newline between all router descriptors when
17422 generating (old style) signed directories, since our spec says
17424 - When providing content-type application/octet-stream for
17425 server descriptors using .z, we were leaving out the
17426 content-encoding header. Oops. (Everything tolerated this just
17427 fine, but that doesn't mean we need to be part of the problem.)
17428 - Fix a potential seg fault in getconf and getinfo using version 1
17429 of the controller protocol.
17430 - Avoid crash: do not check whether DirPort is reachable when we
17431 are suppressing it because of hibernation.
17432 - Make --hash-password not crash on exit.
17435 Changes in version 0.1.1.8-alpha - 2005-10-07
17436 o New features (major):
17437 - Clients don't download or use the directory anymore. Now they
17438 download and use network-statuses from the trusted dirservers,
17439 and fetch individual server descriptors as needed from mirrors.
17440 See dir-spec.txt for all the gory details.
17441 - Be more conservative about whether to advertise our DirPort.
17442 The main change is to not advertise if we're running at capacity
17443 and either a) we could hibernate or b) our capacity is low and
17444 we're using a default DirPort.
17445 - Use OpenSSL's AES when OpenSSL has version 0.9.7 or later.
17447 o New features (minor):
17448 - Try to be smart about when to retry network-status and
17449 server-descriptor fetches. Still needs some tuning.
17450 - Stop parsing, storing, or using running-routers output (but
17451 mirrors still cache and serve it).
17452 - Consider a threshold of versioning dirservers (dirservers who have
17453 an opinion about which Tor versions are still recommended) before
17454 deciding whether to warn the user that he's obsolete.
17455 - Dirservers can now reject/invalidate by key and IP, with the
17456 config options "AuthDirInvalid" and "AuthDirReject". This is
17457 useful since currently we automatically list servers as running
17458 and usable even if we know they're jerks.
17459 - Provide dire warnings to any users who set DirServer; move it out
17460 of torrc.sample and into torrc.complete.
17461 - Add MyFamily to torrc.sample in the server section.
17462 - Add nicknames to the DirServer line, so we can refer to them
17463 without requiring all our users to memorize their IP addresses.
17464 - When we get an EOF or a timeout on a directory connection, note
17465 how many bytes of serverdesc we are dropping. This will help
17466 us determine whether it is smart to parse incomplete serverdesc
17468 - Add a new function to "change pseudonyms" -- that is, to stop
17469 using any currently-dirty circuits for new streams, so we don't
17470 link new actions to old actions. Currently it's only called on
17471 HUP (or SIGNAL RELOAD).
17472 - On sighup, if UseHelperNodes changed to 1, use new circuits.
17473 - Start using RAND_bytes rather than RAND_pseudo_bytes from
17474 OpenSSL. Also, reseed our entropy every hour, not just at
17475 startup. And entropy in 512-bit chunks, not 160-bit chunks.
17477 o Fixes on 0.1.1.7-alpha:
17478 - Nobody ever implemented EVENT_ADDRMAP for control protocol
17479 version 0, so don't let version 0 controllers ask for it.
17480 - If you requested something with too many newlines via the
17481 v1 controller protocol, you could crash tor.
17482 - Fix a number of memory leaks, including some pretty serious ones.
17483 - Re-enable DirPort testing again, so Tor servers will be willing
17484 to advertise their DirPort if it's reachable.
17485 - On TLS handshake, only check the other router's nickname against
17486 its expected nickname if is_named is set.
17488 o Fixes forward-ported from 0.1.0.15:
17489 - Don't crash when we don't have any spare file descriptors and we
17490 try to spawn a dns or cpu worker.
17491 - Make the numbers in read-history and write-history into uint64s,
17492 so they don't overflow and publish negatives in the descriptor.
17494 o Fixes on 0.1.0.x:
17495 - For the OS X package's modified privoxy config file, comment
17496 out the "logfile" line so we don't log everything passed
17498 - We were whining about using socks4 or socks5-with-local-lookup
17499 even when it's an IP in the "virtual" range we designed exactly
17501 - We were leaking some memory every time the client changes IPs.
17502 - Never call free() on tor_malloc()d memory. This will help us
17503 use dmalloc to detect memory leaks.
17504 - Check for named servers when looking them up by nickname;
17505 warn when we'recalling a non-named server by its nickname;
17506 don't warn twice about the same name.
17507 - Try to list MyFamily elements by key, not by nickname, and warn
17508 if we've not heard of the server.
17509 - Make windows platform detection (uname equivalent) smarter.
17510 - It turns out sparc64 doesn't like unaligned access either.
17513 Changes in version 0.1.0.15 - 2005-09-23
17514 o Bugfixes on 0.1.0.x:
17515 - Reject ports 465 and 587 (spam targets) in default exit policy.
17516 - Don't crash when we don't have any spare file descriptors and we
17517 try to spawn a dns or cpu worker.
17518 - Get rid of IgnoreVersion undocumented config option, and make us
17519 only warn, never exit, when we're running an obsolete version.
17520 - Don't try to print a null string when your server finds itself to
17521 be unreachable and the Address config option is empty.
17522 - Make the numbers in read-history and write-history into uint64s,
17523 so they don't overflow and publish negatives in the descriptor.
17524 - Fix a minor memory leak in smartlist_string_remove().
17525 - We were only allowing ourselves to upload a server descriptor at
17526 most every 20 minutes, even if it changed earlier than that.
17527 - Clean up log entries that pointed to old URLs.
17530 Changes in version 0.1.1.7-alpha - 2005-09-14
17531 o Fixes on 0.1.1.6-alpha:
17532 - Exit servers were crashing when people asked them to make a
17533 connection to an address not in their exit policy.
17534 - Looking up a non-existent stream for a v1 control connection would
17536 - Fix a seg fault if we ask a dirserver for a descriptor by
17537 fingerprint but he doesn't know about him.
17538 - SETCONF was appending items to linelists, not clearing them.
17539 - SETCONF SocksBindAddress killed Tor if it fails to bind. Now back
17540 out and refuse the setconf if it would fail.
17541 - Downgrade the dirserver log messages when whining about
17545 - Add Peter Palfrader's check-tor script to tor/contrib/
17546 It lets you easily check whether a given server (referenced by
17547 nickname) is reachable by you.
17548 - Numerous changes to move towards client-side v2 directories. Not
17551 o Fixes on 0.1.0.x:
17552 - If the user gave tor an odd number of command-line arguments,
17553 we were silently ignoring the last one. Now we complain and fail.
17554 [This wins the oldest-bug prize -- this bug has been present since
17555 November 2002, as released in Tor 0.0.0.]
17556 - Do not use unaligned memory access on alpha, mips, or mipsel.
17557 It *works*, but is very slow, so we treat them as if it doesn't.
17558 - Retry directory requests if we fail to get an answer we like
17559 from a given dirserver (we were retrying before, but only if
17560 we fail to connect).
17561 - When writing the RecommendedVersions line, sort them first.
17562 - When the client asked for a rendezvous port that the hidden
17563 service didn't want to provide, we were sending an IP address
17564 back along with the end cell. Fortunately, it was zero. But stop
17566 - Correct "your server is reachable" log entries to indicate that
17567 it was self-testing that told us so.
17570 Changes in version 0.1.1.6-alpha - 2005-09-09
17571 o Fixes on 0.1.1.5-alpha:
17572 - We broke fascistfirewall in 0.1.1.5-alpha. Oops.
17573 - Fix segfault in unit tests in 0.1.1.5-alpha. Oops.
17574 - Fix bug with tor_memmem finding a match at the end of the string.
17575 - Make unit tests run without segfaulting.
17576 - Resolve some solaris x86 compile warnings.
17577 - Handle duplicate lines in approved-routers files without warning.
17578 - Fix bug where as soon as a server refused any requests due to his
17579 exit policy (e.g. when we ask for localhost and he tells us that's
17580 127.0.0.1 and he won't do it), we decided he wasn't obeying his
17581 exit policy using him for any exits.
17582 - Only do openssl hardware accelerator stuff if openssl version is
17585 o New controller features/fixes:
17586 - Add a "RESETCONF" command so you can set config options like
17587 AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
17588 a config option in the torrc with no value, then it clears it
17589 entirely (rather than setting it to its default).
17590 - Add a "GETINFO config-file" to tell us where torrc is.
17591 - Avoid sending blank lines when GETINFO replies should be empty.
17592 - Add a QUIT command for the controller (for using it manually).
17593 - Fix a bug in SAVECONF that was adding default dirservers and
17594 other redundant entries to the torrc file.
17596 o Start on the new directory design:
17597 - Generate, publish, cache, serve new network-status format.
17598 - Publish individual descriptors (by fingerprint, by "all", and by
17600 - Publish client and server recommended versions separately.
17601 - Allow tor_gzip_uncompress() to handle multiple concatenated
17602 compressed strings. Serve compressed groups of router
17603 descriptors. The compression logic here could be more
17605 - Distinguish v1 authorities (all currently trusted directories)
17606 from v2 authorities (all trusted directories).
17607 - Change DirServers config line to note which dirs are v1 authorities.
17608 - Add configuration option "V1AuthoritativeDirectory 1" which
17609 moria1, moria2, and tor26 should set.
17610 - Remove option when getting directory cache to see whether they
17611 support running-routers; they all do now. Replace it with one
17612 to see whether caches support v2 stuff.
17615 - Dirservers now do their own external reachability testing of each
17616 Tor server, and only list them as running if they've been found to
17617 be reachable. We also send back warnings to the server's logs if
17618 it uploads a descriptor that we already believe is unreachable.
17619 - Implement exit enclaves: if we know an IP address for the
17620 destination, and there's a running Tor server at that address
17621 which allows exit to the destination, then extend the circuit to
17622 that exit first. This provides end-to-end encryption and end-to-end
17623 authentication. Also, if the user wants a .exit address or enclave,
17624 use 4 hops rather than 3, and cannibalize a general circ for it
17626 - Permit transitioning from ORPort=0 to ORPort!=0, and back, from the
17627 controller. Also, rotate dns and cpu workers if the controller
17628 changes options that will affect them; and initialize the dns
17629 worker cache tree whether or not we start out as a server.
17630 - Only upload a new server descriptor when options change, 18
17631 hours have passed, uptime is reset, or bandwidth changes a lot.
17632 - Check [X-]Forwarded-For headers in HTTP requests when generating
17633 log messages. This lets people run dirservers (and caches) behind
17634 Apache but still know which IP addresses are causing warnings.
17636 o Config option changes:
17637 - Replace (Fascist)Firewall* config options with a new
17638 ReachableAddresses option that understands address policies.
17639 For example, "ReachableAddresses *:80,*:443"
17640 - Get rid of IgnoreVersion undocumented config option, and make us
17641 only warn, never exit, when we're running an obsolete version.
17642 - Make MonthlyAccountingStart config option truly obsolete now.
17644 o Fixes on 0.1.0.x:
17645 - Reject ports 465 and 587 in the default exit policy, since
17646 people have started using them for spam too.
17647 - It turns out we couldn't bootstrap a network since we added
17648 reachability detection in 0.1.0.1-rc. Good thing the Tor network
17649 has never gone down. Add an AssumeReachable config option to let
17650 servers and dirservers bootstrap. When we're trying to build a
17651 high-uptime or high-bandwidth circuit but there aren't enough
17652 suitable servers, try being less picky rather than simply failing.
17653 - Our logic to decide if the OR we connected to was the right guy
17654 was brittle and maybe open to a mitm for unverified routers.
17655 - We weren't cannibalizing circuits correctly for
17656 CIRCUIT_PURPOSE_C_ESTABLISH_REND and
17657 CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
17658 build those from scratch. This should make hidden services faster.
17659 - Predict required circuits better, with an eye toward making hidden
17660 services faster on the service end.
17661 - Retry streams if the exit node sends back a 'misc' failure. This
17662 should result in fewer random failures. Also, after failing
17663 from resolve failed or misc, reset the num failures, so we give
17664 it a fair shake next time we try.
17665 - Clean up the rendezvous warn log msgs, and downgrade some to info.
17666 - Reduce severity on logs about dns worker spawning and culling.
17667 - When we're shutting down and we do something like try to post a
17668 server descriptor or rendezvous descriptor, don't complain that
17669 we seem to be unreachable. Of course we are, we're shutting down.
17670 - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
17671 We don't use them yet, but maybe one day our DNS resolver will be
17672 able to discover them.
17673 - Make ContactInfo mandatory for authoritative directory servers.
17674 - Require server descriptors to list IPv4 addresses -- hostnames
17675 are no longer allowed. This also fixes some potential security
17676 problems with people providing hostnames as their address and then
17677 preferentially resolving them to partition users.
17678 - Change log line for unreachability to explicitly suggest /etc/hosts
17679 as the culprit. Also make it clearer what IP address and ports we're
17680 testing for reachability.
17681 - Put quotes around user-supplied strings when logging so users are
17682 more likely to realize if they add bad characters (like quotes)
17684 - Let auth dir servers start without specifying an Address config
17686 - Make unit tests (and other invocations that aren't the real Tor)
17687 run without launching listeners, creating subdirectories, and so on.
17690 Changes in version 0.1.1.5-alpha - 2005-08-08
17691 o Bugfixes included in 0.1.0.14.
17693 o Bugfixes on 0.1.0.x:
17694 - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
17695 torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
17696 it would silently using ignore the 6668.
17699 Changes in version 0.1.0.14 - 2005-08-08
17700 o Bugfixes on 0.1.0.x:
17701 - Fix the other half of the bug with crypto handshakes
17703 - Fix an assert trigger if you send a 'signal term' via the
17704 controller when it's listening for 'event info' messages.
17707 Changes in version 0.1.1.4-alpha - 2005-08-04
17708 o Bugfixes included in 0.1.0.13.
17711 - Improve tor_gettimeofday() granularity on windows.
17712 - Make clients regenerate their keys when their IP address changes.
17713 - Implement some more GETINFO goodness: expose helper nodes, config
17714 options, getinfo keys.
17717 Changes in version 0.1.0.13 - 2005-08-04
17718 o Bugfixes on 0.1.0.x:
17719 - Fix a critical bug in the security of our crypto handshakes.
17720 - Fix a size_t underflow in smartlist_join_strings2() that made
17721 it do bad things when you hand it an empty smartlist.
17722 - Fix Windows installer to ship Tor license (thanks to Aphex for
17723 pointing out this oversight) and put a link to the doc directory
17725 - Explicitly set no-unaligned-access for sparc: it turns out the
17726 new gcc's let you compile broken code, but that doesn't make it
17730 Changes in version 0.1.1.3-alpha - 2005-07-23
17731 o Bugfixes on 0.1.1.2-alpha:
17732 - Fix a bug in handling the controller's "post descriptor"
17734 - Fix several bugs in handling the controller's "extend circuit"
17736 - Fix a bug in handling the controller's "stream status" event.
17737 - Fix an assert failure if we have a controller listening for
17738 circuit events and we go offline.
17739 - Re-allow hidden service descriptors to publish 0 intro points.
17740 - Fix a crash when generating your hidden service descriptor if
17741 you don't have enough intro points already.
17743 o New features on 0.1.1.2-alpha:
17744 - New controller function "getinfo accounting", to ask how
17745 many bytes we've used in this time period.
17746 - Experimental support for helper nodes: a lot of the risk from
17747 a small static adversary comes because users pick new random
17748 nodes every time they rebuild a circuit. Now users will try to
17749 stick to the same small set of entry nodes if they can. Not
17750 enabled by default yet.
17752 o Bugfixes on 0.1.0.12:
17753 - If you're an auth dir server, always publish your dirport,
17754 even if you haven't yet found yourself to be reachable.
17755 - Fix a size_t underflow in smartlist_join_strings2() that made
17756 it do bad things when you hand it an empty smartlist.
17759 Changes in version 0.1.0.12 - 2005-07-18
17760 o New directory servers:
17761 - tor26 has changed IP address.
17763 o Bugfixes on 0.1.0.x:
17764 - Fix a possible double-free in tor_gzip_uncompress().
17765 - When --disable-threads is set, do not search for or link against
17766 pthreads libraries.
17767 - Don't trigger an assert if an authoritative directory server
17768 claims its dirport is 0.
17769 - Fix bug with removing Tor as an NT service: some people were
17770 getting "The service did not return an error." Thanks to Matt
17774 Changes in version 0.1.1.2-alpha - 2005-07-15
17775 o New directory servers:
17776 - tor26 has changed IP address.
17778 o Bugfixes on 0.1.0.x, crashes/leaks:
17779 - Port the servers-not-obeying-their-exit-policies fix from
17781 - Fix an fd leak in start_daemon().
17782 - On Windows, you can't always reopen a port right after you've
17783 closed it. So change retry_listeners() to only close and re-open
17784 ports that have changed.
17785 - Fix a possible double-free in tor_gzip_uncompress().
17787 o Bugfixes on 0.1.0.x, usability:
17788 - When tor_socketpair() fails in Windows, give a reasonable
17789 Windows-style errno back.
17790 - Let people type "tor --install" as well as "tor -install" when
17792 want to make it an NT service.
17793 - NT service patch from Matt Edman to improve error messages.
17794 - When the controller asks for a config option with an abbreviated
17795 name, give the full name in our response.
17796 - Correct the man page entry on TrackHostExitsExpire.
17797 - Looks like we were never delivering deflated (i.e. compressed)
17798 running-routers lists, even when asked. Oops.
17799 - When --disable-threads is set, do not search for or link against
17800 pthreads libraries.
17802 o Bugfixes on 0.1.1.x:
17803 - Fix a seg fault with autodetecting which controller version is
17807 - New hidden service descriptor format: put a version in it, and
17808 let people specify introduction/rendezvous points that aren't
17809 in "the directory" (which is subjective anyway).
17810 - Allow the DEBUG controller event to work again. Mark certain log
17811 entries as "don't tell this to controllers", so we avoid cycles.
17814 Changes in version 0.1.0.11 - 2005-06-30
17815 o Bugfixes on 0.1.0.x:
17816 - Fix major security bug: servers were disregarding their
17817 exit policies if clients behaved unexpectedly.
17818 - Make OS X init script check for missing argument, so we don't
17819 confuse users who invoke it incorrectly.
17820 - Fix a seg fault in "tor --hash-password foo".
17821 - The MAPADDRESS control command was broken.
17824 Changes in version 0.1.1.1-alpha - 2005-06-29
17826 - Make OS X init script check for missing argument, so we don't
17827 confuse users who invoke it incorrectly.
17828 - Fix a seg fault in "tor --hash-password foo".
17829 - Fix a possible way to DoS dirservers.
17830 - When we complain that your exit policy implicitly allows local or
17831 private address spaces, name them explicitly so operators can
17833 - Make the log message less scary when all the dirservers are
17834 temporarily unreachable.
17835 - We were printing the number of idle dns workers incorrectly when
17839 - Revised controller protocol (version 1) that uses ascii rather
17840 than binary. Add supporting libraries in python and java so you
17841 can use the controller from your applications without caring how
17842 our protocol works.
17843 - Spiffy new support for crypto hardware accelerators. Can somebody
17847 Changes in version 0.0.9.10 - 2005-06-16
17848 o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
17849 - Refuse relay cells that claim to have a length larger than the
17850 maximum allowed. This prevents a potential attack that could read
17851 arbitrary memory (e.g. keys) from an exit server's process
17855 Changes in version 0.1.0.10 - 2005-06-14
17856 o Allow a few EINVALs from libevent before dying. Warn on kqueue with
17857 libevent before 1.1a.
17860 Changes in version 0.1.0.9-rc - 2005-06-09
17862 - Reset buf->highwater every time buf_shrink() is called, not just on
17863 a successful shrink. This was causing significant memory bloat.
17864 - Fix buffer overflow when checking hashed passwords.
17865 - Security fix: if seeding the RNG on Win32 fails, quit.
17866 - Allow seeding the RNG on Win32 even when you're not running as
17868 - Disable threading on Solaris too. Something is wonky with it,
17869 cpuworkers, and reentrant libs.
17870 - Reenable the part of the code that tries to flush as soon as an
17871 OR outbuf has a full TLS record available. Perhaps this will make
17872 OR outbufs not grow as huge except in rare cases, thus saving lots
17873 of CPU time plus memory.
17874 - Reject malformed .onion addresses rather then passing them on as
17875 normal web requests.
17876 - Adapt patch from Adam Langley: fix possible memory leak in
17877 tor_lookup_hostname().
17878 - Initialize libevent later in the startup process, so the logs are
17879 already established by the time we start logging libevent warns.
17880 - Use correct errno on win32 if libevent fails.
17881 - Check and warn about known-bad/slow libevent versions.
17882 - Pay more attention to the ClientOnly config option.
17883 - Have torctl.in/tor.sh.in check for location of su binary (needed
17885 - Correct/add man page entries for LongLivedPorts, ExitPolicy,
17886 KeepalivePeriod, ClientOnly, NoPublish, HttpProxy, HttpsProxy,
17887 HttpProxyAuthenticator
17888 - Stop warning about sigpipes in the logs. We're going to
17889 pretend that getting these occassionally is normal and fine.
17890 - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in
17892 installer screens; and don't put stuff into StartupItems unless
17893 the user asks you to.
17894 - Require servers that use the default dirservers to have public IP
17895 addresses. We have too many servers that are configured with private
17896 IPs and their admins never notice the log entries complaining that
17897 their descriptors are being rejected.
17898 - Add OSX uninstall instructions. An actual uninstall script will
17902 Changes in version 0.1.0.8-rc - 2005-05-23
17904 - It turns out that kqueue on OS X 10.3.9 was causing kernel
17905 panics. Disable kqueue on all OS X Tors.
17906 - Fix RPM: remove duplicate line accidentally added to the rpm
17908 - Disable threads on openbsd too, since its gethostaddr is not
17910 - Tolerate libevent 0.8 since it still works, even though it's
17912 - Enable building on Red Hat 9.0 again.
17913 - Allow the middle hop of the testing circuit to be running any
17914 version, now that most of them have the bugfix to let them connect
17915 to unknown servers. This will allow reachability testing to work
17916 even when 0.0.9.7-0.0.9.9 become obsolete.
17917 - Handle relay cells with rh.length too large. This prevents
17918 a potential attack that could read arbitrary memory (maybe even
17919 keys) from the exit server's process.
17920 - We screwed up the dirport reachability testing when we don't yet
17921 have a cached version of the directory. Hopefully now fixed.
17922 - Clean up router_load_single_router() (used by the controller),
17923 so it doesn't seg fault on error.
17924 - Fix a minor memory leak when somebody establishes an introduction
17925 point at your Tor server.
17926 - If a socks connection ends because read fails, don't warn that
17927 you're not sending a socks reply back.
17930 - Add HttpProxyAuthenticator config option too, that works like
17931 the HttpsProxyAuthenticator config option.
17932 - Encode hashed controller passwords in hex instead of base64,
17933 to make it easier to write controllers.
17936 Changes in version 0.1.0.7-rc - 2005-05-17
17938 - Fix a bug in the OS X package installer that prevented it from
17939 installing on Tiger.
17940 - Fix a script bug in the OS X package installer that made it
17941 complain during installation.
17942 - Find libevent even if it's hiding in /usr/local/ and your
17943 CFLAGS and LDFLAGS don't tell you to look there.
17944 - Be able to link with libevent as a shared library (the default
17945 after 1.0d), even if it's hiding in /usr/local/lib and even
17946 if you haven't added /usr/local/lib to your /etc/ld.so.conf,
17947 assuming you're running gcc. Otherwise fail and give a useful
17949 - Fix a bug in the RPM packager: set home directory for _tor to
17950 something more reasonable when first installing.
17951 - Free a minor amount of memory that is still reachable on exit.
17954 Changes in version 0.1.0.6-rc - 2005-05-14
17956 - Implement --disable-threads configure option. Disable threads on
17957 netbsd by default, because it appears to have no reentrant resolver
17959 - Apple's OS X 10.4.0 ships with a broken kqueue. The new libevent
17960 release (1.1) detects and disables kqueue if it's broken.
17961 - Append default exit policy before checking for implicit internal
17962 addresses. Now we don't log a bunch of complaints on startup
17963 when using the default exit policy.
17964 - Some people were putting "Address " in their torrc, and they had
17965 a buggy resolver that resolved " " to 0.0.0.0. Oops.
17966 - If DataDir is ~/.tor, and that expands to /.tor, then default to
17967 LOCALSTATEDIR/tor instead.
17968 - Fix fragmented-message bug in TorControl.py.
17969 - Resolve a minor bug which would prevent unreachable dirports
17970 from getting suppressed in the published descriptor.
17971 - When the controller gave us a new descriptor, we weren't resolving
17972 it immediately, so Tor would think its address was 0.0.0.0 until
17973 we fetched a new directory.
17974 - Fix an uppercase/lowercase case error in suppressing a bogus
17975 libevent warning on some Linuxes.
17978 - Begin scrubbing sensitive strings from logs by default. Turn off
17979 the config option SafeLogging if you need to do debugging.
17980 - Switch to a new buffer management algorithm, which tries to avoid
17981 reallocing and copying quite as much. In first tests it looks like
17982 it uses *more* memory on average, but less cpu.
17983 - First cut at support for "create-fast" cells. Clients can use
17984 these when extending to their first hop, since the TLS already
17985 provides forward secrecy and authentication. Not enabled on
17987 - When dirservers refuse a router descriptor, we now log its
17988 contactinfo, platform, and the poster's IP address.
17989 - Call tor_free_all instead of connections_free_all after forking, to
17990 save memory on systems that need to fork.
17991 - Whine at you if you're a server and you don't set your contactinfo.
17992 - Implement --verify-config command-line option to check if your torrc
17993 is valid without actually launching Tor.
17994 - Rewrite address "serifos.exit" to "localhost.serifos.exit"
17995 rather than just rejecting it.
17998 Changes in version 0.1.0.5-rc - 2005-04-27
18000 - Stop trying to print a null pointer if an OR conn fails because
18001 we didn't like its cert.
18003 - Switch our internal buffers implementation to use a ring buffer,
18004 to hopefully improve performance for fast servers a lot.
18005 - Add HttpsProxyAuthenticator support (basic auth only), based
18006 on patch from Adam Langley.
18007 - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
18008 the fast servers that have been joining lately.
18009 - Give hidden service accesses extra time on the first attempt,
18010 since 60 seconds is often only barely enough. This might improve
18012 - Improve performance for dirservers: stop re-parsing the whole
18013 directory every time you regenerate it.
18014 - Add more debugging info to help us find the weird dns freebsd
18015 pthreads bug; cleaner debug messages to help track future issues.
18018 Changes in version 0.0.9.9 - 2005-04-23
18019 o Bugfixes on 0.0.9.x:
18020 - If unofficial Tor clients connect and send weird TLS certs, our
18021 Tor server triggers an assert. This release contains a minimal
18022 backport from the broader fix that we put into 0.1.0.4-rc.
18025 Changes in version 0.1.0.4-rc - 2005-04-23
18027 - If unofficial Tor clients connect and send weird TLS certs, our
18028 Tor server triggers an assert. Stop asserting, and start handling
18029 TLS errors better in other situations too.
18030 - When the controller asks us to tell it about all the debug-level
18031 logs, it turns out we were generating debug-level logs while
18032 telling it about them, which turns into a bad loop. Now keep
18033 track of whether you're sending a debug log to the controller,
18034 and don't log when you are.
18035 - Fix the "postdescriptor" feature of the controller interface: on
18036 non-complete success, only say "done" once.
18038 - Clients are now willing to load balance over up to 2mB, not 1mB,
18039 of advertised bandwidth capacity.
18040 - Add a NoPublish config option, so you can be a server (e.g. for
18041 testing running Tor servers in other Tor networks) without
18042 publishing your descriptor to the primary dirservers.
18045 Changes in version 0.1.0.3-rc - 2005-04-08
18046 o Improvements on 0.1.0.2-rc:
18047 - Client now retries when streams end early for 'hibernating' or
18048 'resource limit' reasons, rather than failing them.
18049 - More automated handling for dirserver operators:
18050 - Automatically approve nodes running 0.1.0.2-rc or later,
18051 now that the the reachability detection stuff is working.
18052 - Now we allow two unverified servers with the same nickname
18053 but different keys. But if a nickname is verified, only that
18054 nickname+key are allowed.
18055 - If you're an authdirserver connecting to an address:port,
18056 and it's not the OR you were expecting, forget about that
18057 descriptor. If he *was* the one you were expecting, then forget
18058 about all other descriptors for that address:port.
18059 - Allow servers to publish descriptors from 12 hours in the future.
18060 Corollary: only whine about clock skew from the dirserver if
18061 he's a trusted dirserver (since now even verified servers could
18062 have quite wrong clocks).
18063 - Adjust maximum skew and age for rendezvous descriptors: let skew
18064 be 48 hours rather than 90 minutes.
18065 - Efficiency improvements:
18066 - Keep a big splay tree of (circid,orconn)->circuit mappings to make
18067 it much faster to look up a circuit for each relay cell.
18068 - Remove most calls to assert_all_pending_dns_resolves_ok(),
18069 since they're eating our cpu on exit nodes.
18070 - Stop wasting time doing a case insensitive comparison for every
18071 dns name every time we do any lookup. Canonicalize the names to
18072 lowercase and be done with it.
18073 - Start sending 'truncated' cells back rather than destroy cells,
18074 if the circuit closes in front of you. This means we won't have
18075 to abandon partially built circuits.
18076 - Only warn once per nickname from add_nickname_list_to_smartlist
18077 per failure, so an entrynode or exitnode choice that's down won't
18079 - Put a note in the torrc about abuse potential with the default
18081 - Revise control spec and implementation to allow all log messages to
18082 be sent to controller with their severities intact (suggested by
18083 Matt Edman). Update TorControl to handle new log event types.
18084 - Provide better explanation messages when controller's POSTDESCRIPTOR
18086 - Stop putting nodename in the Platform string in server descriptors.
18087 It doesn't actually help, and it is confusing/upsetting some people.
18089 o Bugfixes on 0.1.0.2-rc:
18090 - We were printing the host mask wrong in exit policies in server
18091 descriptors. This isn't a critical bug though, since we were still
18092 obeying the exit policy internally.
18093 - Fix Tor when compiled with libevent but without pthreads: move
18094 connection_unregister() from _connection_free() to
18096 - Fix an assert trigger (already fixed in 0.0.9.x): when we have
18097 the rare mysterious case of accepting a conn on 0.0.0.0:0, then
18098 when we look through the connection array, we'll find any of the
18099 cpu/dnsworkers. This is no good.
18101 o Bugfixes on 0.0.9.8:
18102 - Fix possible bug on threading platforms (e.g. win32) which was
18103 leaking a file descriptor whenever a cpuworker or dnsworker died.
18104 - When using preferred entry or exit nodes, ignore whether the
18105 circuit wants uptime or capacity. They asked for the nodes, they
18107 - chdir() to your datadirectory at the *end* of the daemonize process,
18108 not the beginning. This was a problem because the first time you
18109 run tor, if your datadir isn't there, and you have runasdaemon set
18110 to 1, it will try to chdir to it before it tries to create it. Oops.
18111 - Handle changed router status correctly when dirserver reloads
18112 fingerprint file. We used to be dropping all unverified descriptors
18113 right then. The bug was hidden because we would immediately
18114 fetch a directory from another dirserver, which would include the
18115 descriptors we just dropped.
18116 - When we're connecting to an OR and he's got a different nickname/key
18117 than we were expecting, only complain loudly if we're an OP or a
18118 dirserver. Complaining loudly to the OR admins just confuses them.
18119 - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
18120 artificially capped at 500kB.
18123 Changes in version 0.0.9.8 - 2005-04-07
18124 o Bugfixes on 0.0.9.x:
18125 - We have a bug that I haven't found yet. Sometimes, very rarely,
18126 cpuworkers get stuck in the 'busy' state, even though the cpuworker
18127 thinks of itself as idle. This meant that no new circuits ever got
18128 established. Here's a workaround to kill any cpuworker that's been
18129 busy for more than 100 seconds.
18132 Changes in version 0.1.0.2-rc - 2005-04-01
18133 o Bugfixes on 0.1.0.1-rc:
18134 - Fixes on reachability detection:
18135 - Don't check for reachability while hibernating.
18136 - If ORPort is reachable but DirPort isn't, still publish the
18137 descriptor, but zero out DirPort until it's found reachable.
18138 - When building testing circs for ORPort testing, use only
18139 high-bandwidth nodes, so fewer circuits fail.
18140 - Complain about unreachable ORPort separately from unreachable
18141 DirPort, so the user knows what's going on.
18142 - Make sure we only conclude ORPort reachability if we didn't
18143 initiate the conn. Otherwise we could falsely conclude that
18144 we're reachable just because we connected to the guy earlier
18145 and he used that same pipe to extend to us.
18146 - Authdirservers shouldn't do ORPort reachability detection,
18147 since they're in clique mode, so it will be rare to find a
18148 server not already connected to them.
18149 - When building testing circuits, always pick middle hops running
18150 Tor 0.0.9.7, so we avoid the "can't extend to unknown routers"
18151 bug. (This is a kludge; it will go away when 0.0.9.x becomes
18153 - When we decide we're reachable, actually publish our descriptor
18155 - Fix bug in redirectstream in the controller.
18156 - Fix the state descriptor strings so logs don't claim edge streams
18157 are in a different state than they actually are.
18158 - Use recent libevent features when possible (this only really affects
18159 win32 and osx right now, because the new libevent with these
18160 features hasn't been released yet). Add code to suppress spurious
18162 - Prevent possible segfault in connection_close_unattached_ap().
18163 - Fix newlines on torrc in win32.
18164 - Improve error msgs when tor-resolve fails.
18166 o Improvements on 0.0.9.x:
18167 - New experimental script tor/contrib/ExerciseServer.py (needs more
18168 work) that uses the controller interface to build circuits and
18169 fetch pages over them. This will help us bootstrap servers that
18170 have lots of capacity but haven't noticed it yet.
18171 - New experimental script tor/contrib/PathDemo.py (needs more work)
18172 that uses the controller interface to let you choose whole paths
18174 "<hostname>.<path,separated by dots>.<length of path>.path"
18175 - When we've connected to an OR and handshaked but didn't like
18176 the result, we were closing the conn without sending destroy
18177 cells back for pending circuits. Now send those destroys.
18180 Changes in version 0.0.9.7 - 2005-04-01
18181 o Bugfixes on 0.0.9.x:
18182 - Fix another race crash bug (thanks to Glenn Fink for reporting).
18183 - Compare identity to identity, not to nickname, when extending to
18184 a router not already in the directory. This was preventing us from
18185 extending to unknown routers. Oops.
18186 - Make sure to create OS X Tor user in <500 range, so we aren't
18187 creating actual system users.
18188 - Note where connection-that-hasn't-sent-end was marked, and fix
18189 a few really loud instances of this harmless bug (it's fixed more
18193 Changes in version 0.1.0.1-rc - 2005-03-28
18195 - Add reachability testing. Your Tor server will automatically try
18196 to see if its ORPort and DirPort are reachable from the outside,
18197 and it won't upload its descriptor until it decides they are.
18198 - Handle unavailable hidden services better. Handle slow or busy
18199 hidden services better.
18200 - Add support for CONNECTing through https proxies, with "HttpsProxy"
18202 - New exit policy: accept most low-numbered ports, rather than
18203 rejecting most low-numbered ports.
18204 - More Tor controller support (still experimental). See
18205 http://tor.eff.org/doc/control-spec.txt for all the new features,
18206 including signals to emulate unix signals from any platform;
18207 redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
18208 closestream; closecircuit; etc.
18209 - Make nt services work and start on startup on win32 (based on
18210 patch by Matt Edman).
18211 - Add a new AddressMap config directive to rewrite incoming socks
18212 addresses. This lets you, for example, declare an implicit
18213 required exit node for certain sites.
18214 - Add a new TrackHostExits config directive to trigger addressmaps
18215 for certain incoming socks addresses -- for sites that break when
18216 your exit keeps changing (based on patch by Mike Perry).
18217 - Redo the client-side dns cache so it's just an addressmap too.
18218 - Notice when our IP changes, and reset stats/uptime/reachability.
18219 - When an application is using socks5, give him the whole variety of
18220 potential socks5 responses (connect refused, host unreachable, etc),
18221 rather than just "success" or "failure".
18222 - A more sane version numbering system. See
18223 http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
18224 - New contributed script "exitlist": a simple python script to
18225 parse directories and find Tor nodes that exit to listed
18227 - New contributed script "privoxy-tor-toggle" to toggle whether
18228 Privoxy uses Tor. Seems to be configured for Debian by default.
18229 - Report HTTP reasons to client when getting a response from directory
18230 servers -- so you can actually know what went wrong.
18231 - New config option MaxAdvertisedBandwidth which lets you advertise
18232 a low bandwidthrate (to not attract as many circuits) while still
18233 allowing a higher bandwidthrate in reality.
18235 o Robustness/stability fixes:
18236 - Make Tor use Niels Provos's libevent instead of its current
18237 poll-but-sometimes-select mess. This will let us use faster async
18238 cores (like epoll, kpoll, and /dev/poll), and hopefully work better
18240 - pthread support now too. This was forced because when we forked,
18241 we ended up wasting a lot of duplicate ram over time. Also switch
18242 to foo_r versions of some library calls to allow reentry and
18244 - Better handling for heterogeneous / unreliable nodes:
18245 - Annotate circuits w/ whether they aim to contain high uptime nodes
18246 and/or high capacity nodes. When building circuits, choose
18248 - This means that every single node in an intro rend circuit,
18249 not just the last one, will have a minimum uptime.
18250 - New config option LongLivedPorts to indicate application streams
18251 that will want high uptime circuits.
18252 - Servers reset uptime when a dir fetch entirely fails. This
18253 hopefully reflects stability of the server's network connectivity.
18254 - If somebody starts his tor server in Jan 2004 and then fixes his
18255 clock, don't make his published uptime be a year.
18256 - Reset published uptime when you wake up from hibernation.
18257 - Introduce a notion of 'internal' circs, which are chosen without
18258 regard to the exit policy of the last hop. Intro and rendezvous
18259 circs must be internal circs, to avoid leaking information. Resolve
18260 and connect streams can use internal circs if they want.
18261 - New circuit pooling algorithm: make sure to have enough circs around
18262 to satisfy any predicted ports, and also make sure to have 2 internal
18263 circs around if we've required internal circs lately (and with high
18264 uptime if we've seen that lately too).
18265 - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
18266 which describes how often we retry making new circuits if current
18267 ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
18268 how long we're willing to make use of an already-dirty circuit.
18269 - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
18270 circ as necessary, if there are any completed ones lying around
18271 when we try to launch one.
18272 - Make hidden services try to establish a rendezvous for 30 seconds,
18273 rather than for n (where n=3) attempts to build a circuit.
18274 - Change SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to a config option
18275 "ShutdownWaitLength".
18276 - Try to be more zealous about calling connection_edge_end when
18277 things go bad with edge conns in connection.c.
18278 - Revise tor-spec to add more/better stream end reasons.
18279 - Revise all calls to connection_edge_end to avoid sending "misc",
18280 and to take errno into account where possible.
18283 - Fix a race condition that can trigger an assert, when we have a
18284 pending create cell and an OR connection fails right then.
18285 - Fix several double-mark-for-close bugs, e.g. where we were finding
18286 a conn for a cell even if that conn is already marked for close.
18287 - Make sequence of log messages when starting on win32 with no config
18288 file more reasonable.
18289 - When choosing an exit node for a new non-internal circ, don't take
18290 into account whether it'll be useful for any pending x.onion
18291 addresses -- it won't.
18292 - Turn addr_policy_compare from a tristate to a quadstate; this should
18293 help address our "Ah, you allow 1.2.3.4:80. You are a good choice
18294 for google.com" problem.
18295 - Make "platform" string in descriptor more accurate for Win32 servers,
18296 so it's not just "unknown platform".
18297 - Fix an edge case in parsing config options (thanks weasel).
18298 If they say "--" on the commandline, it's not an option.
18299 - Reject odd-looking addresses at the client (e.g. addresses that
18300 contain a colon), rather than having the server drop them because
18302 - tor-resolve requests were ignoring .exit if there was a working circuit
18303 they could use instead.
18304 - REUSEADDR on normal platforms means you can rebind to the port
18305 right after somebody else has let it go. But REUSEADDR on win32
18306 means to let you bind to the port _even when somebody else
18307 already has it bound_! So, don't do that on Win32.
18308 - Change version parsing logic: a version is "obsolete" if it is not
18309 recommended and (1) there is a newer recommended version in the
18310 same series, or (2) there are no recommended versions in the same
18311 series, but there are some recommended versions in a newer series.
18312 A version is "new" if it is newer than any recommended version in
18314 - Stop most cases of hanging up on a socks connection without sending
18318 - Require BandwidthRate to be at least 20kB/s for servers.
18319 - When a dirserver causes you to give a warn, mention which dirserver
18321 - New config option DirAllowPrivateAddresses for authdirservers.
18322 Now by default they refuse router descriptors that have non-IP or
18323 private-IP addresses.
18324 - Stop publishing socksport in the directory, since it's not
18325 actually meant to be public. For compatibility, publish a 0 there
18327 - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
18328 smart" value, that is low for servers and high for clients.
18329 - If our clock jumps forward by 100 seconds or more, assume something
18330 has gone wrong with our network and abandon all not-yet-used circs.
18331 - Warn when exit policy implicitly allows local addresses.
18332 - If we get an incredibly skewed timestamp from a dirserver mirror
18333 that isn't a verified OR, don't warn -- it's probably him that's
18335 - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
18336 cookies to disk and doesn't log each web request to disk. (Thanks
18337 to Brett Carrington for pointing this out.)
18338 - When a client asks us for a dir mirror and we don't have one,
18339 launch an attempt to get a fresh one.
18340 - If we're hibernating and we get a SIGINT, exit immediately.
18341 - Add --with-dmalloc ./configure option, to track memory leaks.
18342 - And try to free all memory on closing, so we can detect what
18344 - Cache local dns resolves correctly even when they're .exit
18346 - Give a better warning when some other server advertises an
18347 ORPort that is actually an apache running ssl.
18348 - Add "opt hibernating 1" to server descriptor to make it clearer
18349 whether the server is hibernating.
18352 Changes in version 0.0.9.6 - 2005-03-24
18353 o Bugfixes on 0.0.9.x (crashes and asserts):
18354 - Add new end stream reasons to maintainance branch. Fix bug where
18355 reason (8) could trigger an assert. Prevent bug from recurring.
18356 - Apparently win32 stat wants paths to not end with a slash.
18357 - Fix assert triggers in assert_cpath_layer_ok(), where we were
18358 blowing away the circuit that conn->cpath_layer points to, then
18359 checking to see if the circ is well-formed. Backport check to make
18360 sure we dont use the cpath on a closed connection.
18361 - Prevent circuit_resume_edge_reading_helper() from trying to package
18362 inbufs for marked-for-close streams.
18363 - Don't crash on hup if your options->address has become unresolvable.
18364 - Some systems (like OS X) sometimes accept() a connection and tell
18365 you the remote host is 0.0.0.0:0. If this happens, due to some
18366 other mis-features, we get confused; so refuse the conn for now.
18368 o Bugfixes on 0.0.9.x (other):
18369 - Fix harmless but scary "Unrecognized content encoding" warn message.
18370 - Add new stream error reason: TORPROTOCOL reason means "you are not
18371 speaking a version of Tor I understand; say bye-bye to your stream."
18372 - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
18373 into the future, now that we are more tolerant of skew. This
18374 resolves a bug where a Tor server would refuse to cache a directory
18375 because all the directories it gets are too far in the future;
18376 yet the Tor server never logs any complaints about clock skew.
18377 - Mac packaging magic: make man pages useable, and do not overwrite
18378 existing torrc files.
18379 - Make OS X log happily to /var/log/tor/tor.log
18382 Changes in version 0.0.9.5 - 2005-02-22
18383 o Bugfixes on 0.0.9.x:
18384 - Fix an assert race at exit nodes when resolve requests fail.
18385 - Stop picking unverified dir mirrors--it only leads to misery.
18386 - Patch from Matt Edman to make NT services work better. Service
18387 support is still not compiled into the executable by default.
18388 - Patch from Dmitri Bely so the Tor service runs better under
18389 the win32 SYSTEM account.
18390 - Make tor-resolve actually work (?) on Win32.
18391 - Fix a sign bug when getrlimit claims to have 4+ billion
18392 file descriptors available.
18393 - Stop refusing to start when bandwidthburst == bandwidthrate.
18394 - When create cells have been on the onion queue more than five
18395 seconds, just send back a destroy and take them off the list.
18398 Changes in version 0.0.9.4 - 2005-02-03
18399 o Bugfixes on 0.0.9:
18400 - Fix an assert bug that took down most of our servers: when
18401 a server claims to have 1 GB of bandwidthburst, don't
18403 - Don't crash as badly if we have spawned the max allowed number
18404 of dnsworkers, or we're out of file descriptors.
18405 - Block more file-sharing ports in the default exit policy.
18406 - MaxConn is now automatically set to the hard limit of max
18407 file descriptors we're allowed (ulimit -n), minus a few for
18409 - Give a clearer message when servers need to raise their
18410 ulimit -n when they start running out of file descriptors.
18411 - SGI Compatibility patches from Jan Schaumann.
18412 - Tolerate a corrupt cached directory better.
18413 - When a dirserver hasn't approved your server, list which one.
18414 - Go into soft hibernation after 95% of the bandwidth is used,
18415 not 99%. This is especially important for daily hibernators who
18416 have a small accounting max. Hopefully it will result in fewer
18417 cut connections when the hard hibernation starts.
18418 - Load-balance better when using servers that claim more than
18419 800kB/s of capacity.
18420 - Make NT services work (experimental, only used if compiled in).
18423 Changes in version 0.0.9.3 - 2005-01-21
18424 o Bugfixes on 0.0.9:
18425 - Backport the cpu use fixes from main branch, so busy servers won't
18426 need as much processor time.
18427 - Work better when we go offline and then come back, or when we
18428 run Tor at boot before the network is up. We do this by
18429 optimistically trying to fetch a new directory whenever an
18430 application request comes in and we think we're offline -- the
18431 human is hopefully a good measure of when the network is back.
18432 - Backport some minimal hidserv bugfixes: keep rend circuits open as
18433 long as you keep using them; actually publish hidserv descriptors
18434 shortly after they change, rather than waiting 20-40 minutes.
18435 - Enable Mac startup script by default.
18436 - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
18437 - When you update AllowUnverifiedNodes or FirewallPorts via the
18438 controller's setconf feature, we were always appending, never
18440 - When you update HiddenServiceDir via setconf, it was screwing up
18441 the order of reading the lines, making it fail.
18442 - Do not rewrite a cached directory back to the cache; otherwise we
18443 will think it is recent and not fetch a newer one on startup.
18444 - Workaround for webservers that lie about Content-Encoding: Tor
18445 now tries to autodetect compressed directories and compression
18446 itself. This lets us Proxypass dir fetches through apache.
18449 Changes in version 0.0.9.2 - 2005-01-04
18450 o Bugfixes on 0.0.9 (crashes and asserts):
18451 - Fix an assert on startup when the disk is full and you're logging
18453 - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
18454 style address, then we'd crash.
18455 - Fix an assert trigger when the running-routers string we get from
18456 a dirserver is broken.
18457 - Make worker threads start and run on win32. Now win32 servers
18459 - Bandaid (not actually fix, but now it doesn't crash) an assert
18460 where the dns worker dies mysteriously and the main Tor process
18461 doesn't remember anything about the address it was resolving.
18463 o Bugfixes on 0.0.9 (Win32):
18464 - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
18465 name out of the warning/assert messages.
18466 - Fix a superficial "unhandled error on read" bug on win32.
18467 - The win32 installer no longer requires a click-through for our
18468 license, since our Free Software license grants rights but does not
18470 - Win32: When connecting to a dirserver fails, try another one
18471 immediately. (This was already working for non-win32 Tors.)
18472 - Stop trying to parse $HOME on win32 when hunting for default
18474 - Make tor-resolve.c work on win32 by calling network_init().
18476 o Bugfixes on 0.0.9 (other):
18477 - Make 0.0.9.x build on Solaris again.
18478 - Due to a fencepost error, we were blowing away the \n when reporting
18479 confvalue items in the controller. So asking for multiple config
18480 values at once couldn't work.
18481 - When listing circuits that are pending on an opening OR connection,
18482 if we're an OR we were listing circuits that *end* at us as
18483 being pending on every listener, dns/cpu worker, etc. Stop that.
18484 - Dirservers were failing to create 'running-routers' or 'directory'
18485 strings if we had more than some threshold of routers. Fix them so
18486 they can handle any number of routers.
18487 - Fix a superficial "Duplicate mark for close" bug.
18488 - Stop checking for clock skew for OR connections, even for servers.
18489 - Fix a fencepost error that was chopping off the last letter of any
18490 nickname that is the maximum allowed nickname length.
18491 - Update URLs in log messages so they point to the new website.
18492 - Fix a potential problem in mangling server private keys while
18493 writing to disk (not triggered yet, as far as we know).
18494 - Include the licenses for other free software we include in Tor,
18495 now that we're shipping binary distributions more regularly.
18498 Changes in version 0.0.9.1 - 2004-12-15
18499 o Bugfixes on 0.0.9:
18500 - Make hibernation actually work.
18501 - Make HashedControlPassword config option work.
18502 - When we're reporting event circuit status to a controller,
18503 don't use the stream status code.
18506 Changes in version 0.0.9 - 2004-12-12
18508 - Clean up manpage and torrc.sample file.
18509 - Clean up severities and text of log warnings.
18511 - Make servers trigger an assert when they enter hibernation.
18514 Changes in version 0.0.9rc7 - 2004-12-08
18515 o Bugfixes on 0.0.9rc:
18516 - Fix a stack-trashing crash when an exit node begins hibernating.
18517 - Avoid looking at unallocated memory while considering which
18518 ports we need to build circuits to cover.
18519 - Stop a sigpipe: when an 'end' cell races with eof from the app,
18520 we shouldn't hold-open-until-flush if the eof arrived first.
18521 - Fix a bug with init_cookie_authentication() in the controller.
18522 - When recommending new-format log lines, if the upper bound is
18523 LOG_ERR, leave it implicit.
18525 o Bugfixes on 0.0.8.1:
18526 - Fix a whole slew of memory leaks.
18527 - Fix isspace() and friends so they still make Solaris happy
18528 but also so they don't trigger asserts on win32.
18529 - Fix parse_iso_time on platforms without strptime (eg win32).
18530 - win32: tolerate extra "readable" events better.
18531 - win32: when being multithreaded, leave parent fdarray open.
18532 - Make unit tests work on win32.
18535 Changes in version 0.0.9rc6 - 2004-12-06
18536 o Bugfixes on 0.0.9pre:
18537 - Clean up some more integer underflow opportunities (not exploitable
18539 - While hibernating, hup should not regrow our listeners.
18540 - Send an end to the streams we close when we hibernate, rather
18541 than just chopping them off.
18542 - React to eof immediately on non-open edge connections.
18544 o Bugfixes on 0.0.8.1:
18545 - Calculate timeout for waiting for a connected cell from the time
18546 we sent the begin cell, not from the time the stream started. If
18547 it took a long time to establish the circuit, we would time out
18548 right after sending the begin cell.
18549 - Fix router_compare_addr_to_addr_policy: it was not treating a port
18550 of * as always matching, so we were picking reject *:* nodes as
18551 exit nodes too. Oops.
18554 - New circuit building strategy: keep a list of ports that we've
18555 used in the past 6 hours, and always try to have 2 circuits open
18556 or on the way that will handle each such port. Seed us with port
18557 80 so web users won't complain that Tor is "slow to start up".
18558 - Make kill -USR1 dump more useful stats about circuits.
18559 - When warning about retrying or giving up, print the address, so
18560 the user knows which one it's talking about.
18561 - If you haven't used a clean circuit in an hour, throw it away,
18562 just to be on the safe side. (This means after 6 hours a totally
18563 unused Tor client will have no circuits open.)
18566 Changes in version 0.0.9rc5 - 2004-12-01
18567 o Bugfixes on 0.0.8.1:
18568 - Disallow NDEBUG. We don't ever want anybody to turn off debug.
18569 - Let resolve conns retry/expire also, rather than sticking around
18571 - If we are using select, make sure we stay within FD_SETSIZE.
18573 o Bugfixes on 0.0.9pre:
18574 - Fix integer underflow in tor_vsnprintf() that may be exploitable,
18575 but doesn't seem to be currently; thanks to Ilja van Sprundel for
18577 - If anybody set DirFetchPostPeriod, give them StatusFetchPeriod
18578 instead. Impose minima and maxima for all *Period options; impose
18579 even tighter maxima for fetching if we are a caching dirserver.
18580 Clip rather than rejecting.
18581 - Fetch cached running-routers from servers that serve it (that is,
18582 authdirservers and servers running 0.0.9rc5-cvs or later.)
18585 - Accept *:706 (silc) in default exit policy.
18586 - Implement new versioning format for post 0.1.
18587 - Support "foo.nickname.exit" addresses, to let Alice request the
18588 address "foo" as viewed by exit node "nickname". Based on a patch
18590 - Make tor --version --version dump the cvs Id of every file.
18593 Changes in version 0.0.9rc4 - 2004-11-28
18594 o Bugfixes on 0.0.8.1:
18595 - Make windows sockets actually non-blocking (oops), and handle
18596 win32 socket errors better.
18598 o Bugfixes on 0.0.9rc1:
18599 - Actually catch the -USR2 signal.
18602 Changes in version 0.0.9rc3 - 2004-11-25
18603 o Bugfixes on 0.0.8.1:
18604 - Flush the log file descriptor after we print "Tor opening log file",
18605 so we don't see those messages days later.
18607 o Bugfixes on 0.0.9rc1:
18608 - Make tor-resolve work again.
18609 - Avoid infinite loop in tor-resolve if tor hangs up on it.
18610 - Fix an assert trigger for clients/servers handling resolves.
18613 Changes in version 0.0.9rc2 - 2004-11-24
18614 o Bugfixes on 0.0.9rc1:
18615 - I broke socks5 support while fixing the eof bug.
18616 - Allow unitless bandwidths and intervals; they default to bytes
18618 - New servers don't start out hibernating; they are active until
18619 they run out of bytes, so they have a better estimate of how
18620 long it takes, and so their operators can know they're working.
18623 Changes in version 0.0.9rc1 - 2004-11-23
18624 o Bugfixes on 0.0.8.1:
18625 - Finally fix a bug that's been plaguing us for a year:
18626 With high load, circuit package window was reaching 0. Whenever
18627 we got a circuit-level sendme, we were reading a lot on each
18628 socket, but only writing out a bit. So we would eventually reach
18629 eof. This would be noticed and acted on even when there were still
18630 bytes sitting in the inbuf.
18631 - When poll() is interrupted, we shouldn't believe the revents values.
18633 o Bugfixes on 0.0.9pre6:
18634 - Fix hibernate bug that caused pre6 to be broken.
18635 - Don't keep rephist info for routers that haven't had activity for
18636 24 hours. (This matters now that clients have keys, since we track
18638 - Never call close_temp_logs while validating log options.
18639 - Fix backslash-escaping on tor.sh.in and torctl.in.
18642 - Implement weekly/monthly/daily accounting: now you specify your
18643 hibernation properties by
18644 AccountingMax N bytes|KB|MB|GB|TB
18645 AccountingStart day|week|month [day] HH:MM
18646 Defaults to "month 1 0:00".
18647 - Let bandwidth and interval config options be specified as 5 bytes,
18648 kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
18649 - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
18650 get back to normal.)
18651 - If your requested entry or exit node has advertised bandwidth 0,
18653 - Be more greedy about filling up relay cells -- we try reading again
18654 once we've processed the stuff we read, in case enough has arrived
18655 to fill the last cell completely.
18656 - Apply NT service patch from Osamu Fujino. Still needs more work.
18659 Changes in version 0.0.9pre6 - 2004-11-15
18660 o Bugfixes on 0.0.8.1:
18661 - Fix assert failure on malformed socks4a requests.
18662 - Use identity comparison, not nickname comparison, to choose which
18663 half of circuit-ID-space each side gets to use. This is needed
18664 because sometimes we think of a router as a nickname, and sometimes
18665 as a hex ID, and we can't predict what the other side will do.
18666 - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
18667 write() call will fail and we handle it there.
18668 - Add a FAST_SMARTLIST define to optionally inline smartlist_get
18669 and smartlist_len, which are two major profiling offenders.
18671 o Bugfixes on 0.0.9pre5:
18672 - Fix a bug in read_all that was corrupting config files on windows.
18673 - When we're raising the max number of open file descriptors to
18674 'unlimited', don't log that we just raised it to '-1'.
18675 - Include event code with events, as required by control-spec.txt.
18676 - Don't give a fingerprint when clients do --list-fingerprint:
18677 it's misleading, because it will never be the same again.
18678 - Stop using strlcpy in tor_strndup, since it was slowing us
18680 - Remove warn on startup about missing cached-directory file.
18681 - Make kill -USR1 work again.
18682 - Hibernate if we start tor during the "wait for wakeup-time" phase
18683 of an accounting interval. Log our hibernation plans better.
18684 - Authoritative dirservers now also cache their directory, so they
18685 have it on start-up.
18688 - Fetch running-routers; cache running-routers; compress
18689 running-routers; serve compressed running-routers.z
18690 - Add NSI installer script contributed by J Doe.
18691 - Commit VC6 and VC7 workspace/project files.
18692 - Commit a tor.spec for making RPM files, with help from jbash.
18693 - Add contrib/torctl.in contributed by Glenn Fink.
18694 - Implement the control-spec's SAVECONF command, to write your
18695 configuration to torrc.
18696 - Get cookie authentication for the controller closer to working.
18697 - Include control-spec.txt in the tarball.
18698 - When set_conf changes our server descriptor, upload a new copy.
18699 But don't upload it too often if there are frequent changes.
18700 - Document authentication config in man page, and document signals
18702 - Clean up confusing parts of man page and torrc.sample.
18703 - Make expand_filename handle ~ and ~username.
18704 - Use autoconf to enable largefile support where necessary. Use
18705 ftello where available, since ftell can fail at 2GB.
18706 - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
18707 log more informatively.
18708 - Give a slightly more useful output for "tor -h".
18709 - Refuse application socks connections to port 0.
18710 - Check clock skew for verified servers, but allow unverified
18711 servers and clients to have any clock skew.
18712 - Break DirFetchPostPeriod into:
18713 - DirFetchPeriod for fetching full directory,
18714 - StatusFetchPeriod for fetching running-routers,
18715 - DirPostPeriod for posting server descriptor,
18716 - RendPostPeriod for posting hidden service descriptors.
18717 - Make sure the hidden service descriptors are at a random offset
18718 from each other, to hinder linkability.
18721 Changes in version 0.0.9pre5 - 2004-11-09
18722 o Bugfixes on 0.0.9pre4:
18723 - Fix a seg fault in unit tests (doesn't affect main program).
18724 - Fix an assert bug where a hidden service provider would fail if
18725 the first hop of his rendezvous circuit was down.
18726 - Hidden service operators now correctly handle version 1 style
18727 INTRODUCE1 cells (nobody generates them still, so not a critical
18729 - If do_hup fails, actually notice.
18730 - Handle more errnos from accept() without closing the listener.
18731 Some OpenBSD machines were closing their listeners because
18732 they ran out of file descriptors.
18733 - Send resolve cells to exit routers that are running a new
18734 enough version of the resolve code to work right.
18735 - Better handling of winsock includes on non-MSV win32 compilers.
18736 - Some people had wrapped their tor client/server in a script
18737 that would restart it whenever it died. This did not play well
18738 with our "shut down if your version is obsolete" code. Now people
18739 don't fetch a new directory if their local cached version is
18741 - Make our autogen.sh work on ksh as well as bash.
18744 - Hibernation: New config option "AccountingMaxKB" lets you
18745 set how many KBytes per month you want to allow your server to
18746 consume. Rather than spreading those bytes out evenly over the
18747 month, we instead hibernate for some of the month and pop up
18748 at a deterministic time, work until the bytes are consumed, then
18749 hibernate again. Config option "MonthlyAccountingStart" lets you
18750 specify which day of the month your billing cycle starts on.
18751 - Control interface: a separate program can now talk to your
18752 client/server over a socket, and get/set config options, receive
18753 notifications of circuits and streams starting/finishing/dying,
18754 bandwidth used, etc. The next step is to get some GUIs working.
18755 Let us know if you want to help out. See doc/control-spec.txt .
18756 - Ship a contrib/tor-control.py as an example script to interact
18757 with the control port.
18758 - "tor --hash-password zzyxz" will output a salted password for
18759 use in authenticating to the control interface.
18760 - New log format in config:
18761 "Log minsev[-maxsev] stdout|stderr|syslog" or
18762 "Log minsev[-maxsev] file /var/foo"
18765 - DirPolicy config option, to let people reject incoming addresses
18766 from their dirserver.
18767 - "tor --list-fingerprint" will list your identity key fingerprint
18769 - Add "pass" target for RedirectExit, to make it easier to break
18770 out of a sequence of RedirectExit rules.
18771 - Clients now generate a TLS cert too, in preparation for having
18772 them act more like real nodes.
18773 - Ship src/win32/ in the tarball, so people can use it to build.
18774 - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
18776 - New "router-status" line in directory, to better bind each verified
18777 nickname to its identity key.
18778 - Deprecate unofficial config option abbreviations, and abbreviations
18779 not on the command line.
18780 - Add a pure-C tor-resolve implementation.
18781 - Use getrlimit and friends to ensure we can reach MaxConn (currently
18782 1024) file descriptors.
18784 o Code security improvements, inspired by Ilja:
18785 - Replace sprintf with snprintf. (I think they were all safe, but
18787 - Replace strcpy/strncpy with strlcpy in more places.
18788 - Avoid strcat; use snprintf or strlcat instead.
18789 - snprintf wrapper with consistent (though not C99) overflow behavior.
18792 Changes in version 0.0.9pre4 - 2004-10-17
18793 o Bugfixes on 0.0.9pre3:
18794 - If the server doesn't specify an exit policy, use the real default
18795 exit policy, not reject *:*.
18796 - Ignore fascistfirewall when uploading/downloading hidden service
18797 descriptors, since we go through Tor for those; and when using
18798 an HttpProxy, since we assume it can reach them all.
18799 - When looking for an authoritative dirserver, use only the ones
18800 configured at boot. Don't bother looking in the directory.
18801 - The rest of the fix for get_default_conf_file() on older win32.
18802 - Make 'Routerfile' config option obsolete.
18805 - New 'MyFamily nick1,...' config option for a server to
18806 specify other servers that shouldn't be used in the same circuit
18807 with it. Only believed if nick1 also specifies us.
18808 - New 'NodeFamily nick1,nick2,...' config option for a client to
18809 specify nodes that it doesn't want to use in the same circuit.
18810 - New 'Redirectexit pattern address:port' config option for a
18811 server to redirect exit connections, e.g. to a local squid.
18814 Changes in version 0.0.9pre3 - 2004-10-13
18815 o Bugfixes on 0.0.8.1:
18816 - Better torrc example lines for dirbindaddress and orbindaddress.
18817 - Improved bounds checking on parsed ints (e.g. config options and
18818 the ones we find in directories.)
18819 - Better handling of size_t vs int, so we're more robust on 64
18821 - Fix the rest of the bug where a newly started OR would appear
18822 as unverified even after we've added his fingerprint and hupped
18824 - Fix a bug from 0.0.7: when read() failed on a stream, we would
18825 close it without sending back an end. So 'connection refused'
18826 would simply be ignored and the user would get no response.
18828 o Bugfixes on 0.0.9pre2:
18829 - Serving the cached-on-disk directory to people is bad. We now
18830 provide no directory until we've fetched a fresh one.
18831 - Workaround for bug on windows where cached-directories get crlf
18833 - Make get_default_conf_file() work on older windows too.
18834 - If we write a *:* exit policy line in the descriptor, don't write
18835 any more exit policy lines.
18838 - Use only 0.0.9pre1 and later servers for resolve cells.
18839 - Make the dirservers file obsolete.
18840 - Include a dir-signing-key token in directories to tell the
18841 parsing entity which key is being used to sign.
18842 - Remove the built-in bulky default dirservers string.
18843 - New config option "Dirserver %s:%d [fingerprint]", which can be
18844 repeated as many times as needed. If no dirservers specified,
18845 default to moria1,moria2,tor26.
18846 - Make moria2 advertise a dirport of 80, so people behind firewalls
18847 will be able to get a directory.
18848 - Http proxy support
18849 - Dirservers translate requests for http://%s:%d/x to /x
18850 - You can specify "HttpProxy %s[:%d]" and all dir fetches will
18851 be routed through this host.
18852 - Clients ask for /tor/x rather than /x for new enough dirservers.
18853 This way we can one day coexist peacefully with apache.
18854 - Clients specify a "Host: %s%d" http header, to be compatible
18855 with more proxies, and so running squid on an exit node can work.
18858 Changes in version 0.0.8.1 - 2004-10-13
18860 - Fix a seg fault that can be triggered remotely for Tor
18861 clients/servers with an open dirport.
18862 - Fix a rare assert trigger, where routerinfos for entries in
18863 our cpath would expire while we're building the path.
18864 - Fix a bug in OutboundBindAddress so it (hopefully) works.
18865 - Fix a rare seg fault for people running hidden services on
18866 intermittent connections.
18867 - Fix a bug in parsing opt keywords with objects.
18868 - Fix a stale pointer assert bug when a stream detaches and
18870 - Fix a string format vulnerability (probably not exploitable)
18871 in reporting stats locally.
18872 - Fix an assert trigger: sometimes launching circuits can fail
18873 immediately, e.g. because too many circuits have failed recently.
18874 - Fix a compile warning on 64 bit platforms.
18877 Changes in version 0.0.9pre2 - 2004-10-03
18879 - Make fetching a cached directory work for 64-bit platforms too.
18880 - Make zlib.h a required header, not an optional header.
18883 Changes in version 0.0.9pre1 - 2004-10-01
18885 - Stop using separate defaults for no-config-file and
18886 empty-config-file. Now you have to explicitly turn off SocksPort,
18887 if you don't want it open.
18888 - Fix a bug in OutboundBindAddress so it (hopefully) works.
18889 - Improve man page to mention more of the 0.0.8 features.
18890 - Fix a rare seg fault for people running hidden services on
18891 intermittent connections.
18892 - Change our file IO stuff (especially wrt OpenSSL) so win32 is
18894 - Fix more dns related bugs: send back resolve_failed and end cells
18895 more reliably when the resolve fails, rather than closing the
18896 circuit and then trying to send the cell. Also attach dummy resolve
18897 connections to a circuit *before* calling dns_resolve(), to fix
18898 a bug where cached answers would never be sent in RESOLVED cells.
18899 - When we run out of disk space, or other log writing error, don't
18900 crash. Just stop logging to that log and continue.
18901 - We were starting to daemonize before we opened our logs, so if
18902 there were any problems opening logs, we would complain to stderr,
18903 which wouldn't work, and then mysteriously exit.
18904 - Fix a rare bug where sometimes a verified OR would connect to us
18905 before he'd uploaded his descriptor, which would cause us to
18906 assign conn->nickname as though he's unverified. Now we look through
18907 the fingerprint list to see if he's there.
18908 - Fix a rare assert trigger, where routerinfos for entries in
18909 our cpath would expire while we're building the path.
18912 - Clients can ask dirservers for /dir.z to get a compressed version
18913 of the directory. Only works for servers running 0.0.9, of course.
18914 - Make clients cache directories and use them to seed their router
18915 lists at startup. This means clients have a datadir again.
18916 - Configuration infrastructure support for warning on obsolete
18918 - Respond to content-encoding headers by trying to uncompress as
18920 - Reply with a deflated directory when a client asks for "dir.z".
18921 We could use allow-encodings instead, but allow-encodings isn't
18922 specified in HTTP 1.0.
18923 - Raise the max dns workers from 50 to 100.
18924 - Discourage people from setting their dirfetchpostperiod more often
18925 than once per minute.
18926 - Protect dirservers from overzealous descriptor uploading -- wait
18927 10 seconds after directory gets dirty, before regenerating.
18930 Changes in version 0.0.8 - 2004-08-25
18931 o Port it to SunOS 5.9 / Athena
18934 Changes in version 0.0.8rc2 - 2004-08-20
18935 o Make it compile on cygwin again.
18936 o When picking unverified routers, skip those with low uptime and/or
18937 low bandwidth, depending on what properties you care about.
18940 Changes in version 0.0.8rc1 - 2004-08-18
18941 o Changes from 0.0.7.3:
18943 - Fix assert triggers: if the other side returns an address 0.0.0.0,
18944 don't put it into the client dns cache.
18945 - If a begin failed due to exit policy, but we believe the IP address
18946 should have been allowed, switch that router to exitpolicy reject *:*
18947 until we get our next directory.
18949 - Clients choose nodes proportional to advertised bandwidth.
18950 - Avoid using nodes with low uptime as introduction points.
18951 - Handle servers with dynamic IP addresses: don't replace
18952 options->Address with the resolved one at startup, and
18953 detect our address right before we make a routerinfo each time.
18954 - 'FascistFirewall' option to pick dirservers and ORs on specific
18955 ports; plus 'FirewallPorts' config option to tell FascistFirewall
18956 which ports are open. (Defaults to 80,443)
18957 - Be more aggressive about trying to make circuits when the network
18958 has changed (e.g. when you unsuspend your laptop).
18959 - Check for time skew on http headers; report date in response to
18961 - If the entrynode config line has only one node, don't pick it as
18963 - Add strict{entry|exit}nodes config options. If set to 1, then
18964 we refuse to build circuits that don't include the specified entry
18966 - OutboundBindAddress config option, to bind to a specific
18967 IP address for outgoing connect()s.
18968 - End truncated log entries (e.g. directories) with "[truncated]".
18970 o Patches to 0.0.8preX:
18972 - Patches to compile and run on win32 again (maybe)?
18973 - Fix crash when looking for ~/.torrc with no $HOME set.
18974 - Fix a race bug in the unit tests.
18975 - Handle verified/unverified name collisions better when new
18976 routerinfo's arrive in a directory.
18977 - Sometimes routers were getting entered into the stats before
18978 we'd assigned their identity_digest. Oops.
18979 - Only pick and establish intro points after we've gotten a
18982 - AllowUnverifiedNodes config option to let circuits choose no-name
18983 routers in entry,middle,exit,introduction,rendezvous positions.
18984 Allow middle and rendezvous positions by default.
18985 - Add a man page for tor-resolve.
18988 Changes in version 0.0.7.3 - 2004-08-12
18989 o Stop dnsworkers from triggering an assert failure when you
18990 ask them to resolve the host "".
18993 Changes in version 0.0.8pre3 - 2004-08-09
18994 o Changes from 0.0.7.2:
18995 - Allow multiple ORs with same nickname in routerlist -- now when
18996 people give us one identity key for a nickname, then later
18997 another, we don't constantly complain until the first expires.
18998 - Remember used bandwidth (both in and out), and publish 15-minute
18999 snapshots for the past day into our descriptor.
19000 - You can now fetch $DIRURL/running-routers to get just the
19001 running-routers line, not the whole descriptor list. (But
19002 clients don't use this yet.)
19003 - When people mistakenly use Tor as an http proxy, point them
19004 at the tor-doc.html rather than the INSTALL.
19005 - Remove our mostly unused -- and broken -- hex_encode()
19006 function. Use base16_encode() instead. (Thanks to Timo Lindfors
19007 for pointing out this bug.)
19008 - Rotate onion keys every 12 hours, not every 2 hours, so we have
19009 fewer problems with people using the wrong key.
19010 - Change the default exit policy to reject the default edonkey,
19011 kazaa, gnutella ports.
19012 - Add replace_file() to util.[ch] to handle win32's rename().
19014 o Changes from 0.0.8preX:
19015 - Fix two bugs in saving onion keys to disk when rotating, so
19016 hopefully we'll get fewer people using old onion keys.
19017 - Fix an assert error that was making SocksPolicy not work.
19018 - Be willing to expire routers that have an open dirport -- it's
19019 just the authoritative dirservers we want to not forget.
19020 - Reject tor-resolve requests for .onion addresses early, so we
19021 don't build a whole rendezvous circuit and then fail.
19022 - When you're warning a server that he's unverified, don't cry
19023 wolf unpredictably.
19024 - Fix a race condition: don't try to extend onto a connection
19025 that's still handshaking.
19026 - For servers in clique mode, require the conn to be open before
19027 you'll choose it for your path.
19028 - Fix some cosmetic bugs about duplicate mark-for-close, lack of
19029 end relay cell, etc.
19030 - Measure bandwidth capacity over the last 24 hours, not just 12
19031 - Bugfix: authoritative dirservers were making and signing a new
19032 directory for each client, rather than reusing the cached one.
19035 Changes in version 0.0.8pre2 - 2004-08-04
19036 o Changes from 0.0.7.2:
19038 - Check directory signature _before_ you decide whether you're
19039 you're running an obsolete version and should exit.
19040 - Check directory signature _before_ you parse the running-routers
19041 list to decide who's running or verified.
19042 - Bugfixes and features:
19043 - Check return value of fclose while writing to disk, so we don't
19044 end up with broken files when servers run out of disk space.
19045 - Log a warning if the user uses an unsafe socks variant, so people
19046 are more likely to learn about privoxy or socat.
19047 - Dirservers now include RFC1123-style dates in the HTTP headers,
19048 which one day we will use to better detect clock skew.
19050 o Changes from 0.0.8pre1:
19051 - Make it compile without warnings again on win32.
19052 - Log a warning if you're running an unverified server, to let you
19053 know you might want to get it verified.
19054 - Only pick a default nickname if you plan to be a server.
19057 Changes in version 0.0.8pre1 - 2004-07-23
19059 - Made our unit tests compile again on OpenBSD 3.5, and tor
19060 itself compile again on OpenBSD on a sparc64.
19061 - We were neglecting milliseconds when logging on win32, so
19062 everything appeared to happen at the beginning of each second.
19064 o Protocol changes:
19065 - 'Extend' relay cell payloads now include the digest of the
19066 intended next hop's identity key. Now we can verify that we're
19067 extending to the right router, and also extend to routers we
19068 hadn't heard of before.
19071 - Tor nodes can now act as relays (with an advertised ORPort)
19072 without being manually verified by the dirserver operators.
19073 - Uploaded descriptors of unverified routers are now accepted
19074 by the dirservers, and included in the directory.
19075 - Verified routers are listed by nickname in the running-routers
19076 list; unverified routers are listed as "$<fingerprint>".
19077 - We now use hash-of-identity-key in most places rather than
19078 nickname or addr:port, for improved security/flexibility.
19079 - To avoid Sybil attacks, paths still use only verified servers.
19080 But now we have a chance to play around with hybrid approaches.
19081 - Nodes track bandwidth usage to estimate capacity (not used yet).
19082 - ClientOnly option for nodes that never want to become servers.
19083 - Directory caching.
19084 - "AuthoritativeDir 1" option for the official dirservers.
19085 - Now other nodes (clients and servers) will cache the latest
19086 directory they've pulled down.
19087 - They can enable their DirPort to serve it to others.
19088 - Clients will pull down a directory from any node with an open
19089 DirPort, and check the signature/timestamp correctly.
19090 - Authoritative dirservers now fetch directories from other
19091 authdirservers, to stay better synced.
19092 - Running-routers list tells who's down also, along with noting
19093 if they're verified (listed by nickname) or unverified (listed
19095 - Allow dirservers to serve running-router list separately.
19096 This isn't used yet.
19097 - ORs connect-on-demand to other ORs
19098 - If you get an extend cell to an OR you're not connected to,
19099 connect, handshake, and forward the create cell.
19100 - The authoritative dirservers stay connected to everybody,
19101 and everybody stays connected to 0.0.7 servers, but otherwise
19102 clients/servers expire unused connections after 5 minutes.
19103 - When servers get a sigint, they delay 30 seconds (refusing new
19104 connections) then exit. A second sigint causes immediate exit.
19105 - File and name management:
19106 - Look for .torrc if no CONFDIR "torrc" is found.
19107 - If no datadir is defined, then choose, make, and secure ~/.tor
19109 - If torrc not found, exitpolicy reject *:*.
19110 - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
19111 - If no nickname is defined, derive default from hostname.
19112 - Rename secret key files, e.g. identity.key -> secret_id_key,
19113 to discourage people from mailing their identity key to tor-ops.
19114 - Refuse to build a circuit before the directory has arrived --
19115 it won't work anyway, since you won't know the right onion keys
19117 - Try other dirservers immediately if the one you try is down. This
19118 should tolerate down dirservers better now.
19119 - Parse tor version numbers so we can do an is-newer-than check
19120 rather than an is-in-the-list check.
19121 - New socks command 'resolve', to let us shim gethostbyname()
19123 - A 'tor_resolve' script to access the socks resolve functionality.
19124 - A new socks-extensions.txt doc file to describe our
19125 interpretation and extensions to the socks protocols.
19126 - Add a ContactInfo option, which gets published in descriptor.
19127 - Publish OR uptime in descriptor (and thus in directory) too.
19128 - Write tor version at the top of each log file
19129 - New docs in the tarball:
19131 - Document that you should proxy your SSL traffic too.
19134 Changes in version 0.0.7.2 - 2004-07-07
19135 o A better fix for the 0.0.0.0 problem, that will hopefully
19136 eliminate the remaining related assertion failures.
19139 Changes in version 0.0.7.1 - 2004-07-04
19140 o When an address resolves to 0.0.0.0, treat it as a failed resolve,
19141 since internally we use 0.0.0.0 to signify "not yet resolved".
19144 Changes in version 0.0.7 - 2004-06-07
19145 o Updated the man page to reflect the new features.
19148 Changes in version 0.0.7rc2 - 2004-06-06
19149 o Changes from 0.0.7rc1:
19150 - Make it build on Win32 again.
19151 o Changes from 0.0.6.2:
19152 - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
19156 Changes in version 0.0.7rc1 - 2004-06-02
19158 - On sighup, we were adding another log without removing the first
19159 one. So log messages would get duplicated n times for n sighups.
19160 - Several cases of using a connection after we'd freed it. The
19161 problem was that connections that are pending resolve are in both
19162 the pending_resolve tree, and also the circuit's resolving_streams
19163 list. When you want to remove one, you must remove it from both.
19164 - Fix a double-mark-for-close where an end cell arrived for a
19165 resolving stream, and then the resolve failed.
19166 - Check directory signatures based on name of signer, not on whom
19167 we got the directory from. This will let us cache directories more
19170 - Crank up some of our constants to handle more users.
19173 Changes in version 0.0.7pre1 - 2004-06-02
19174 o Fixes for crashes and other obnoxious bugs:
19175 - Fix an epipe bug: sometimes when directory connections failed
19176 to connect, we would give them a chance to flush before closing
19178 - When we detached from a circuit because of resolvefailed, we
19179 would immediately try the same circuit twice more, and then
19180 give up on the resolve thinking we'd tried three different
19182 - Limit the number of intro circuits we'll attempt to build for a
19183 hidden service per 15-minute period.
19184 - Check recommended-software string *early*, before actually parsing
19185 the directory. Thus we can detect an obsolete version and exit,
19186 even if the new directory format doesn't parse.
19187 o Fixes for security bugs:
19188 - Remember which nodes are dirservers when you startup, and if a
19189 random OR enables his dirport, don't automatically assume he's
19190 a trusted dirserver.
19192 - Directory connections were asking the wrong poll socket to
19193 start writing, and not asking themselves to start writing.
19194 - When we detached from a circuit because we sent a begin but
19195 didn't get a connected, we would use it again the first time;
19196 but after that we would correctly switch to a different one.
19197 - Stop warning when the first onion decrypt attempt fails; they
19198 will sometimes legitimately fail now that we rotate keys.
19199 - Override unaligned-access-ok check when $host_cpu is ia64 or
19200 arm. Apparently they allow it but the kernel whines.
19201 - Dirservers try to reconnect periodically too, in case connections
19203 - Fix some memory leaks in directory servers.
19204 - Allow backslash in Win32 filenames.
19205 - Made Tor build complain-free on FreeBSD, hopefully without
19206 breaking other BSD builds. We'll see.
19208 - Doxygen markup on all functions and global variables.
19209 - Make directory functions update routerlist, not replace it. So
19210 now directory disagreements are not so critical a problem.
19211 - Remove the upper limit on number of descriptors in a dirserver's
19212 directory (not that we were anywhere close).
19213 - Allow multiple logfiles at different severity ranges.
19214 - Allow *BindAddress to specify ":port" rather than setting *Port
19215 separately. Allow multiple instances of each BindAddress config
19216 option, so you can bind to multiple interfaces if you want.
19217 - Allow multiple exit policy lines, which are processed in order.
19218 Now we don't need that huge line with all the commas in it.
19219 - Enable accept/reject policies on SOCKS connections, so you can bind
19220 to 0.0.0.0 but still control who can use your OP.
19223 Changes in version 0.0.6.2 - 2004-05-16
19224 o Our integrity-checking digest was checking only the most recent cell,
19225 not the previous cells like we'd thought.
19226 Thanks to Stefan Mark for finding the flaw!
19229 Changes in version 0.0.6.1 - 2004-05-06
19230 o Fix two bugs in our AES counter-mode implementation (this affected
19231 onion-level stream encryption, but not TLS-level). It turns
19232 out we were doing something much more akin to a 16-character
19233 polyalphabetic cipher. Oops.
19234 Thanks to Stefan Mark for finding the flaw!
19235 o Retire moria3 as a directory server, and add tor26 as a directory
19239 Changes in version 0.0.6 - 2004-05-02
19240 [version bump only]
19243 Changes in version 0.0.6rc4 - 2004-05-01
19244 o Update the built-in dirservers list to use the new directory format
19245 o Fix a rare seg fault: if a node offering a hidden service attempts
19246 to build a circuit to Alice's rendezvous point and fails before it
19247 reaches the last hop, it retries with a different circuit, but
19249 o Handle windows socket errors correctly.
19252 Changes in version 0.0.6rc3 - 2004-04-28
19253 o Don't expire non-general excess circuits (if we had enough
19254 circuits open, we were expiring rendezvous circuits -- even
19255 when they had a stream attached. oops.)
19256 o Fetch randomness from /dev/urandom better (not via fopen/fread)
19257 o Better debugging for tls errors
19258 o Some versions of openssl have an SSL_pending function that erroneously
19259 returns bytes when there is a non-application record pending.
19260 o Set Content-Type on the directory and hidserv descriptor.
19261 o Remove IVs from cipher code, since AES-ctr has none.
19262 o Win32 fixes. Tor now compiles on win32 with no warnings/errors.
19263 o We were using an array of length zero in a few places.
19264 o win32's gethostbyname can't resolve an IP to an IP.
19265 o win32's close can't close a socket.
19268 Changes in version 0.0.6rc2 - 2004-04-26
19269 o Fix a bug where we were closing tls connections intermittently.
19270 It turns out openssl keeps its errors around -- so if an error
19271 happens, and you don't ask about it, and then another openssl
19272 operation happens and succeeds, and you ask if there was an error,
19273 it tells you about the first error. Fun fun.
19274 o Fix a bug that's been lurking since 27 may 03 (!)
19275 When passing back a destroy cell, we would use the wrong circ id.
19276 'Mostly harmless', but still worth fixing.
19277 o Since we don't support truncateds much, don't bother sending them;
19278 just close the circ.
19279 o check for <machine/limits.h> so we build on NetBSD again (I hope).
19280 o don't crash if a conn that sent a begin has suddenly lost its circuit
19281 (this was quite rare).
19284 Changes in version 0.0.6rc1 - 2004-04-25
19285 o We now rotate link (tls context) keys and onion keys.
19286 o CREATE cells now include oaep padding, so you can tell
19287 if you decrypted them correctly.
19288 o Add bandwidthburst to server descriptor.
19289 o Directories now say which dirserver signed them.
19290 o Use a tor_assert macro that logs failed assertions too.
19293 Changes in version 0.0.6pre5 - 2004-04-18
19294 o changes from 0.0.6pre4:
19295 - make tor build on broken freebsd 5.2 installs
19296 - fix a failed assert when you try an intro point, get a nack, and try
19297 a second one and it works.
19298 - when alice uses a port that the hidden service doesn't accept,
19299 it now sends back an end cell (denied by exit policy). otherwise
19300 alice would just have to wait to time out.
19301 - fix another rare bug: when we had tried all the intro
19302 points for a hidden service, we fetched the descriptor
19303 again, but we left our introcirc thinking it had already
19304 sent an intro, so it kept waiting for a response...
19305 - bugfix: when you sleep your hidden-service laptop, as soon
19306 as it wakes up it tries to upload a service descriptor, but
19307 socketpair fails for some reason (localhost not up yet?).
19308 now we simply give up on that upload, and we'll try again later.
19309 i'd still like to find the bug though.
19310 - if an intro circ waiting for an ack dies before getting one, then
19312 - we were reusing stale service descriptors and refetching usable
19316 Changes in version 0.0.6pre4 - 2004-04-14
19317 o changes from 0.0.6pre3:
19318 - when bob fails to connect to the rendezvous point, and his
19319 circ didn't fail because of the rendezvous point itself, then
19320 he retries a couple of times
19321 - we expire introduction and rendezvous circs more thoroughly
19322 (sometimes they were hanging around forever)
19323 - we expire unattached rendezvous streams that have been around
19324 too long (they were sticking around forever).
19325 - fix a measly fencepost error that was crashing everybody with
19329 Changes in version 0.0.6pre3 - 2004-04-14
19330 o changes from 0.0.6pre2:
19331 - make hup work again
19332 - fix some memory leaks for dirservers
19333 - allow more skew in rendezvous descriptor timestamps, to help
19334 handle people like blanu who don't know what time it is
19335 - normal circs are 3 hops, but some rend/intro circs are 4, if
19336 the initiator doesn't get to choose the last hop
19337 - send acks for introductions, so alice can know whether to try
19339 - bob publishes intro points more correctly
19340 o changes from 0.0.5:
19341 - fix an assert trigger that's been plaguing us since the days
19342 of 0.0.2prexx (thanks weasel!)
19343 - retry stream correctly when we fail to connect because of
19344 exit-policy-reject (should try another) or can't-resolve-address
19345 (also should try another, because dns on random internet servers
19347 - when we hup a dirserver and we've *removed* a server from the
19348 approved-routers list, now we remove that server from the
19349 in-memory directories too
19352 Changes in version 0.0.6pre2 - 2004-04-08
19353 o We fixed our base32 implementation. Now it works on all architectures.
19356 Changes in version 0.0.6pre1 - 2004-04-08
19358 - Hidden services and rendezvous points are implemented. Go to
19359 http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
19360 hidden services. (This only works via a socks4a proxy such as
19361 Privoxy, and currently it's quite slow.)
19364 Changes in version 0.0.5 - 2004-03-30
19365 [version bump only]
19368 Changes in version 0.0.5rc3 - 2004-03-29
19369 o Install torrc as torrc.sample -- we no longer clobber your
19371 o Re-enable recommendedversion checking (we broke it in rc2, oops)
19372 o Add in a 'notice' log level for things the operator should hear
19373 but that aren't warnings
19376 Changes in version 0.0.5rc2 - 2004-03-29
19377 o Hold socks connection open until reply is flushed (if possible)
19378 o Make exit nodes resolve IPs to IPs immediately, rather than asking
19379 the dns farm to do it.
19380 o Fix c99 aliasing warnings in rephist.c
19381 o Don't include server descriptors that are older than 24 hours in the
19383 o Give socks 'reject' replies their whole 15s to attempt to flush,
19384 rather than seeing the 60s timeout and assuming the flush had failed.
19385 o Clean automake droppings from the cvs repository
19388 Changes in version 0.0.5rc1 - 2004-03-28
19389 o Fix mangled-state bug in directory fetching (was causing sigpipes).
19390 o Only build circuits after we've fetched the directory: clients were
19391 using only the directory servers before they'd fetched a directory.
19392 This also means longer startup time; so it goes.
19393 o Fix an assert trigger where an OP would fail to handshake, and we'd
19394 expect it to have a nickname.
19395 o Work around a tsocks bug: do a socks reject when AP connection dies
19396 early, else tsocks goes into an infinite loop.
19399 Changes in version 0.0.4 - 2004-03-26
19400 o When connecting to a dirserver or OR and the network is down,
19404 Changes in version 0.0.3 - 2004-03-26
19405 o Warn and fail if server chose a nickname with illegal characters
19406 o Port to Solaris and Sparc:
19407 - include missing header fcntl.h
19408 - have autoconf find -lsocket -lnsl automatically
19409 - deal with hardware word alignment
19410 - make uname() work (solaris has a different return convention)
19411 - switch from using signal() to sigaction()
19412 o Preliminary work on reputation system:
19413 - Keep statistics on success/fail of connect attempts; they're published
19414 by kill -USR1 currently.
19415 - Add a RunTesting option to try to learn link state by creating test
19416 circuits, even when SocksPort is off.
19417 - Remove unused open circuits when there are too many.
19420 Changes in version 0.0.2 - 2004-03-19
19421 - Include strlcpy and strlcat for safer string ops
19422 - define INADDR_NONE so we compile (but still not run) on solaris
19425 Changes in version 0.0.2pre27 - 2004-03-14
19427 - Allow internal tor networks (we were rejecting internal IPs,
19428 now we allow them if they're set explicitly).
19429 - And fix a few endian issues.
19432 Changes in version 0.0.2pre26 - 2004-03-14
19434 - If a stream times out after 15s without a connected cell, don't
19435 try that circuit again: try a new one.
19436 - Retry streams at most 4 times. Then give up.
19437 - When a dirserver gets a descriptor from an unknown router, it
19438 logs its fingerprint (so the dirserver operator can choose to
19439 accept it even without mail from the server operator).
19440 - Inform unapproved servers when we reject their descriptors.
19441 - Make tor build on Windows again. It works as a client, who knows
19443 - Clearer instructions in the torrc for how to set up a server.
19444 - Be more efficient about reading fd's when our global token bucket
19445 (used for rate limiting) becomes empty.
19447 - Stop asserting that computers always go forward in time. It's
19449 - When we sent a cell (e.g. destroy) and then marked an OR connection
19450 expired, we might close it before finishing a flush if the other
19451 side isn't reading right then.
19452 - Don't allow dirservers to start if they haven't defined
19453 RecommendedVersions
19454 - We were caching transient dns failures. Oops.
19455 - Prevent servers from publishing an internal IP as their address.
19456 - Address a strcat vulnerability in circuit.c
19459 Changes in version 0.0.2pre25 - 2004-03-04
19461 - Put the OR's IP in its router descriptor, not its fqdn. That way
19462 we'll stop being stalled by gethostbyname for nodes with flaky dns,
19465 - If the user typed in an address that didn't resolve, the server
19469 Changes in version 0.0.2pre24 - 2004-03-03
19471 - Fix an assertion failure in dns.c, where we were trying to dequeue
19472 a pending dns resolve even if it wasn't pending
19473 - Fix a spurious socks5 warning about still trying to write after the
19474 connection is finished.
19475 - Hold certain marked_for_close connections open until they're finished
19476 flushing, rather than losing bytes by closing them too early.
19477 - Correctly report the reason for ending a stream
19478 - Remove some duplicate calls to connection_mark_for_close
19479 - Put switch_id and start_daemon earlier in the boot sequence, so it
19480 will actually try to chdir() to options.DataDirectory
19481 - Make 'make test' exit(1) if a test fails; fix some unit tests
19482 - Make tor fail when you use a config option it doesn't know about,
19483 rather than warn and continue.
19484 - Make --version work
19485 - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
19488 Changes in version 0.0.2pre23 - 2004-02-29
19490 - Print a statement when the first circ is finished, so the user
19491 knows it's working.
19492 - If a relay cell is unrecognized at the end of the circuit,
19493 send back a destroy. (So attacks to mutate cells are more
19495 - New config option 'excludenodes' to avoid certain nodes for circuits.
19496 - When it daemonizes, it chdir's to the DataDirectory rather than "/",
19497 so you can collect coredumps there.
19499 - Fix a bug in tls flushing where sometimes data got wedged and
19500 didn't flush until more data got sent. Hopefully this bug was
19501 a big factor in the random delays we were seeing.
19502 - Make 'connected' cells include the resolved IP, so the client
19503 dns cache actually gets populated.
19504 - Disallow changing from ORPort=0 to ORPort>0 on hup.
19505 - When we time-out on a stream and detach from the circuit, send an
19506 end cell down it first.
19507 - Only warn about an unknown router (in exitnodes, entrynodes,
19508 excludenodes) after we've fetched a directory.
19511 Changes in version 0.0.2pre22 - 2004-02-26
19513 - Servers publish less revealing uname information in descriptors.
19514 - More memory tracking and assertions, to crash more usefully when
19516 - If the default torrc isn't there, just use some default defaults.
19517 Plus provide an internal dirservers file if they don't have one.
19518 - When the user tries to use Tor as an http proxy, give them an http
19519 501 failure explaining that we're a socks proxy.
19520 - Dump a new router.desc on hup, to help confused people who change
19521 their exit policies and then wonder why router.desc doesn't reflect
19523 - Clean up the generic tor.sh init script that we ship with.
19525 - If the exit stream is pending on the resolve, and a destroy arrives,
19526 then the stream wasn't getting removed from the pending list. I
19527 think this was the one causing recent server crashes.
19528 - Use a more robust poll on OSX 10.3, since their poll is flaky.
19529 - When it couldn't resolve any dirservers, it was useless from then on.
19530 Now it reloads the RouterFile (or default dirservers) if it has no
19532 - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
19533 many users don't even *have* a /usr/local/sbin/.
19536 Changes in version 0.0.2pre21 - 2004-02-18
19538 - There's a ChangeLog file that actually reflects the changelog.
19539 - There's a 'torify' wrapper script, with an accompanying
19540 tor-tsocks.conf, that simplifies the process of using tsocks for
19541 tor. It even has a man page.
19542 - The tor binary gets installed to sbin rather than bin now.
19543 - Retry streams where the connected cell hasn't arrived in 15 seconds
19544 - Clean up exit policy handling -- get the default out of the torrc,
19545 so we can update it without forcing each server operator to fix
19547 - Allow imaps and pop3s in default exit policy
19549 - Prevent picking middleman nodes as the last node in the circuit
19552 Changes in version 0.0.2pre20 - 2004-01-30
19554 - We now have a deb package, and it's in debian unstable. Go to
19555 it, apt-getters. :)
19556 - I've split the TotalBandwidth option into BandwidthRate (how many
19557 bytes per second you want to allow, long-term) and
19558 BandwidthBurst (how many bytes you will allow at once before the cap
19559 kicks in). This better token bucket approach lets you, say, set
19560 BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
19561 performance while not exceeding your monthly bandwidth quota.
19562 - Push out a tls record's worth of data once you've got it, rather
19563 than waiting until you've read everything waiting to be read. This
19564 may improve performance by pipelining better. We'll see.
19565 - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
19566 from failed circuits (if they haven't been connected yet) and attach
19568 - Expire old streams that haven't managed to connect. Some day we'll
19569 have them reattach to new circuits instead.
19572 - Fix several memory leaks that were causing servers to become bloated
19574 - Fix a few very rare assert triggers. A few more remain.
19575 - Setuid to User _before_ complaining about running as root.
19578 Changes in version 0.0.2pre19 - 2004-01-07
19580 - Fix deadlock condition in dns farm. We were telling a child to die by
19581 closing the parent's file descriptor to him. But newer children were
19582 inheriting the open file descriptor from the parent, and since they
19583 weren't closing it, the socket never closed, so the child never read
19584 eof, so he never knew to exit. Similarly, dns workers were holding
19585 open other sockets, leading to all sorts of chaos.
19586 - New cleaner daemon() code for forking and backgrounding.
19587 - If you log to a file, it now prints an entry at the top of the
19588 logfile so you know it's working.
19589 - The onionskin challenge length was 30 bytes longer than necessary.
19590 - Started to patch up the spec so it's not quite so out of date.
19593 Changes in version 0.0.2pre18 - 2004-01-02
19595 - Fix endian issues with the 'integrity' field in the relay header.
19596 - Fix a potential bug where connections in state
19597 AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
19600 Changes in version 0.0.2pre17 - 2003-12-30
19602 - Made --debuglogfile (or any second log file, actually) work.
19603 - Resolved an edge case in get_unique_circ_id_by_conn where a smart
19604 adversary could force us into an infinite loop.
19607 - Each onionskin handshake now includes a hash of the computed key,
19608 to prove the server's identity and help perfect forward secrecy.
19609 - Changed cell size from 256 to 512 bytes (working toward compatibility
19611 - Changed cell length to 2 bytes, and moved it to the relay header.
19612 - Implemented end-to-end integrity checking for the payloads of
19614 - Separated streamid from 'recognized' (otherwise circuits will get
19615 messed up when we try to have streams exit from the middle). We
19616 use the integrity-checking to confirm that a cell is addressed to
19618 - Randomize the initial circid and streamid values, so an adversary who
19619 breaks into a node can't learn how many circuits or streams have
19623 Changes in version 0.0.2pre16 - 2003-12-14
19625 - Fixed a bug that made HUP trigger an assert
19626 - Fixed a bug where a circuit that immediately failed wasn't being
19627 counted as a failed circuit in counting retries.
19630 - Now we close the circuit when we get a truncated cell: otherwise we're
19631 open to an anonymity attack where a bad node in the path truncates
19632 the circuit and then we open streams at him.
19633 - Add port ranges to exit policies
19634 - Add a conservative default exit policy
19635 - Warn if you're running tor as root
19636 - on HUP, retry OR connections and close/rebind listeners
19637 - options.EntryNodes: try these nodes first when picking the first node
19638 - options.ExitNodes: if your best choices happen to include any of
19639 your preferred exit nodes, you choose among just those preferred
19641 - options.ExcludedNodes: nodes that are never picked in path building
19644 Changes in version 0.0.2pre15 - 2003-12-03
19645 o Robustness and bugfixes:
19646 - Sometimes clients would cache incorrect DNS resolves, which would
19647 really screw things up.
19648 - An OP that goes offline would slowly leak all its sockets and stop
19650 - A wide variety of bugfixes in exit node selection, exit policy
19651 handling, and processing pending streams when a new circuit is
19653 - Pick nodes for a path only from those the directory says are up
19654 - Choose randomly from all running dirservers, not always the first one
19655 - Increase allowed http header size for directory fetch.
19656 - Stop writing to stderr (if we're daemonized it will be closed).
19657 - Enable -g always, so cores will be more useful to me.
19658 - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
19661 - Wrote a man page. It lists commonly used options.
19664 - Change default loglevel to warn.
19665 - Make PidFile default to null rather than littering in your CWD.
19666 - OnionRouter config option is now obsolete. Instead it just checks
19668 - Moved to a single unified torrc file for both clients and servers.
19671 Changes in version 0.0.2pre14 - 2003-11-29
19672 o Robustness and bugfixes:
19673 - Force the admin to make the DataDirectory himself
19674 - to get ownership/permissions right
19675 - so clients no longer make a DataDirectory and then never use it
19676 - fix bug where a client who was offline for 45 minutes would never
19677 pull down a directory again
19678 - fix (or at least hide really well) the dns assert bug that was
19679 causing server crashes
19680 - warnings and improved robustness wrt clockskew for certs
19681 - use the native daemon(3) to daemonize, when available
19682 - exit if bind() fails
19683 - exit if neither socksport nor orport is defined
19684 - include our own tor_timegm (Win32 doesn't have its own)
19685 - bugfix for win32 with lots of connections
19686 - fix minor bias in PRNG
19687 - make dirserver more robust to corrupt cached directory
19690 - Wrote the design document (woo)
19692 o Circuit building and exit policies:
19693 - Circuits no longer try to use nodes that the directory has told them
19695 - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
19696 bitcounts (18.0.0.0/8).
19697 - Make AP connections standby for a circuit if no suitable circuit
19698 exists, rather than failing
19699 - Circuits choose exit node based on addr/port, exit policies, and
19700 which AP connections are standing by
19701 - Bump min pathlen from 2 to 3
19702 - Relay end cells have a payload to describe why the stream ended.
19703 - If the stream failed because of exit policy, try again with a new
19705 - Clients have a dns cache to remember resolved addresses.
19706 - Notice more quickly when we have no working circuits
19709 - APPort is now called SocksPort
19710 - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
19712 - RecommendedVersions is now a config variable rather than
19713 hardcoded (for dirservers)
19714 - Reloads config on HUP
19715 - Usage info on -h or --help
19716 - If you set User and Group config vars, it'll setu/gid to them.
19719 Changes in version 0.0.2pre13 - 2003-10-19
19720 o General stability:
19721 - SSL_write no longer fails when it returns WANTWRITE and the number
19722 of bytes in the buf has changed by the next SSL_write call.
19723 - Fix segfault fetching directory when network is down
19724 - Fix a variety of minor memory leaks
19725 - Dirservers reload the fingerprints file on HUP, so I don't have
19726 to take down the network when I approve a new router
19727 - Default server config file has explicit Address line to specify fqdn
19730 - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
19731 - Make listener connections not ever alloc bufs
19733 o Autoconf improvements:
19734 - don't clobber an external CFLAGS in ./configure
19735 - Make install now works
19736 - create var/lib/tor on make install
19737 - autocreate a tor.sh initscript to help distribs
19738 - autocreate the torrc and sample-server-torrc with correct paths
19740 o Log files and Daemonizing now work:
19741 - If --DebugLogFile is specified, log to it at -l debug
19742 - If --LogFile is specified, use it instead of commandline
19743 - If --RunAsDaemon is set, tor forks and backgrounds on startup