ReleaseNotes 747 KB

  1. This document summarizes new features and bugfixes in each stable release
  2. of Tor. If you want to see more detailed descriptions of the changes in
  3. each development snapshot, see the ChangeLog file.
  4. Changes in version - 2016-12-19
  5. Tor backports a fix for a medium-severity issue (bug 21018
  6. below) where Tor clients could crash when attempting to visit a
  7. hostile hidden service. Clients are recommended to upgrade as packages
  8. become available for their systems.
  9. It also includes an updated list of fallback directories, backported
  10. from 0.2.9.
  11. Now that the Tor 0.2.9 series is stable, only major bugfixes will be
  12. backported to 0.2.8 in the future.
  13. o Major bugfixes (parsing, security, backported from
  14. - Fix a bug in parsing that could cause clients to read a single
  15. byte past the end of an allocated region. This bug could be used
  16. to cause hardened clients (built with --enable-expensive-hardening)
  17. to crash if they tried to visit a hostile hidden service. Non-
  18. hardened clients are only affected depending on the details of
  19. their platform's memory allocator. Fixes bug 21018; bugfix on
  20. Found by using libFuzzer. Also tracked as TROVE-
  21. 2016-12-002 and as CVE-2016-1254.
  22. o Minor features (fallback directory list, backported from
  23. - Replace the 81 remaining fallbacks of the 100 originally
  24. introduced in Tor in March 2016, with a list of 177
  25. fallbacks (123 new, 54 existing, 27 removed) generated in December
  26. 2016. Resolves ticket 20170.
  27. o Minor features (geoip, backported from
  28. - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
  29. Country database.
  30. Changes in version - 2016-12-19
  31. Tor is the first stable release of the Tor 0.2.9 series.
  32. The Tor 0.2.9 series makes mandatory a number of security features
  33. that were formerly optional. It includes support for a new shared-
  34. randomness protocol that will form the basis for next generation
  35. hidden services, includes a single-hop hidden service mode for
  36. optimizing .onion services that don't actually want to be hidden,
  37. tries harder not to overload the directory authorities with excessive
  38. downloads, and supports a better protocol versioning scheme for
  39. improved compatibility with other implementations of the Tor protocol.
  40. And of course, there are numerous other bugfixes and improvements.
  41. This release also includes a fix for a medium-severity issue (bug
  42. 21018 below) where Tor clients could crash when attempting to visit a
  43. hostile hidden service. Clients are recommended to upgrade as packages
  44. become available for their systems.
  45. Below are listed the changes since Tor For a list of
  46. changes since, see the ChangeLog file.
  47. o New system requirements:
  48. - When building with OpenSSL, Tor now requires version 1.0.1 or
  49. later. OpenSSL 1.0.0 and earlier are no longer supported by the
  50. OpenSSL team, and should not be used. Closes ticket 20303.
  51. - Tor now requires Libevent version 2.0.10-stable or later. Older
  52. versions of Libevent have less efficient backends for several
  53. platforms, and lack the DNS code that we use for our server-side
  54. DNS support. This implements ticket 19554.
  55. - Tor now requires zlib version 1.2 or later, for security,
  56. efficiency, and (eventually) gzip support. (Back when we started,
  57. zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
  58. released in 2003. We recommend the latest version.)
  59. o Deprecated features:
  60. - A number of DNS-cache-related sub-options for client ports are now
  61. deprecated for security reasons, and may be removed in a future
  62. version of Tor. (We believe that client-side DNS caching is a bad
  63. idea for anonymity, and you should not turn it on.) The options
  64. are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
  65. UseIPv4Cache, and UseIPv6Cache.
  66. - A number of options are deprecated for security reasons, and may
  67. be removed in a future version of Tor. The options are:
  68. AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
  69. AllowSingleHopExits, ClientDNSRejectInternalAddresses,
  70. CloseHSClientCircuitsImmediatelyOnTimeout,
  71. CloseHSServiceRendCircuitsImmediatelyOnTimeout,
  72. ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
  73. UseNTorHandshake, and WarnUnsafeSocks.
  74. - The *ListenAddress options are now deprecated as unnecessary: the
  75. corresponding *Port options should be used instead. These options
  76. may someday be removed. The affected options are:
  77. ControlListenAddress, DNSListenAddress, DirListenAddress,
  78. NATDListenAddress, ORListenAddress, SocksListenAddress,
  79. and TransListenAddress.
  80. o Major bugfixes (parsing, security, new since
  81. - Fix a bug in parsing that could cause clients to read a single
  82. byte past the end of an allocated region. This bug could be used
  83. to cause hardened clients (built with --enable-expensive-hardening)
  84. to crash if they tried to visit a hostile hidden service. Non-
  85. hardened clients are only affected depending on the details of
  86. their platform's memory allocator. Fixes bug 21018; bugfix on
  87. Found by using libFuzzer. Also tracked as TROVE-
  88. 2016-12-002 and as CVE-2016-1254.
  89. o Major features (build, hardening):
  90. - Tor now builds with -ftrapv by default on compilers that support
  91. it. This option detects signed integer overflow (which C forbids),
  92. and turns it into a hard-failure. We do not apply this option to
  93. code that needs to run in constant time to avoid side-channels;
  94. instead, we use -fwrapv in that code. Closes ticket 17983.
  95. - When --enable-expensive-hardening is selected, stop applying the
  96. clang/gcc sanitizers to code that needs to run in constant time.
  97. Although we are aware of no introduced side-channels, we are not
  98. able to prove that there are none. Related to ticket 17983.
  99. o Major features (circuit building, security):
  100. - Authorities, relays, and clients now require ntor keys in all
  101. descriptors, for all hops (except for rare hidden service protocol
  102. cases), for all circuits, and for all other roles. Part of
  103. ticket 19163.
  104. - Authorities, relays, and clients only use ntor, except for
  105. rare cases in the hidden service protocol. Part of ticket 19163.
  106. o Major features (compilation):
  107. - Our big list of extra GCC warnings is now enabled by default when
  108. building with GCC (or with anything like Clang that claims to be
  109. GCC-compatible). To make all warnings into fatal compilation
  110. errors, pass --enable-fatal-warnings to configure. Closes
  111. ticket 19044.
  112. - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
  113. turn on C and POSIX extensions. (Previously, we attempted to do
  114. this on an ad hoc basis.) Closes ticket 19139.
  115. o Major features (directory authorities, hidden services):
  116. - Directory authorities can now perform the shared randomness
  117. protocol specified by proposal 250. Using this protocol, directory
  118. authorities generate a global fresh random value every day. In the
  119. future, this value will be used by hidden services to select
  120. HSDirs. This release implements the directory authority feature;
  121. the hidden service side will be implemented in the future as part
  122. of proposal 224. Resolves ticket 16943; implements proposal 250.
  123. o Major features (downloading, random exponential backoff):
  124. - When we fail to download an object from a directory service, wait
  125. for an (exponentially increasing) randomized amount of time before
  126. retrying, rather than a fixed interval as we did before. This
  127. prevents a group of Tor instances from becoming too synchronized,
  128. or a single Tor instance from becoming too predictable, in its
  129. download schedule. Closes ticket 15942.
  130. o Major features (resource management):
  131. - Tor can now notice it is about to run out of sockets, and
  132. preemptively close connections of lower priority. (This feature is
  133. off by default for now, since the current prioritizing method is
  134. yet not mature enough. You can enable it by setting
  135. "DisableOOSCheck 0", but watch out: it might close some sockets
  136. you would rather have it keep.) Closes ticket 18640.
  137. o Major features (single-hop "hidden" services):
  138. - Add experimental HiddenServiceSingleHopMode and
  139. HiddenServiceNonAnonymousMode options. When both are set to 1,
  140. every hidden service on that Tor instance becomes a non-anonymous
  141. Single Onion Service. Single Onions make one-hop (direct)
  142. connections to their introduction and rendezvous points. One-hop
  143. circuits make Single Onion servers easily locatable, but clients
  144. remain location-anonymous. This is compatible with the existing
  145. hidden service implementation, and works on the current Tor
  146. network without any changes to older relays or clients. Implements
  147. proposal 260, completes ticket 17178. Patch by teor and asn.
  148. o Major features (subprotocol versions):
  149. - Tor directory authorities now vote on a set of recommended
  150. "subprotocol versions", and on a set of required subprotocol
  151. versions. Clients and relays that lack support for a _required_
  152. subprotocol version will not start; those that lack support for a
  153. _recommended_ subprotocol version will warn the user to upgrade.
  154. This change allows compatible implementations of the Tor protocol(s)
  155. to exist without pretending to be 100% bug-compatible with
  156. particular releases of Tor itself. Closes ticket 19958; implements
  157. part of proposal 264.
  158. o Major bugfixes (circuit building):
  159. - Hidden service client-to-intro-point and service-to-rendezvous-
  160. point circuits use the TAP key supplied by the protocol, to avoid
  161. epistemic attacks. Fixes bug 19163; bugfix on
  162. o Major bugfixes (download scheduling):
  163. - Avoid resetting download status for consensuses hourly, since we
  164. already have another, smarter retry mechanism. Fixes bug 8625;
  165. bugfix on
  166. - If a consensus expires while we are waiting for certificates to
  167. download, stop waiting for certificates.
  168. - If we stop waiting for certificates less than a minute after we
  169. started downloading them, do not consider the certificate download
  170. failure a separate failure. Fixes bug 20533; bugfix
  171. on
  172. - When using exponential backoff in test networks, use a lower
  173. exponent, so the delays do not vary as much. This helps test
  174. networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
  175. o Major bugfixes (exit policies):
  176. - Avoid disclosing exit outbound bind addresses, configured port
  177. bind addresses, and local interface addresses in relay descriptors
  178. by default under ExitPolicyRejectPrivate. Instead, only reject
  179. these (otherwise unlisted) addresses if
  180. ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
  181. Patch by teor.
  182. o Major bugfixes (hidden services):
  183. - Allow Tor clients with appropriate controllers to work with
  184. FetchHidServDescriptors set to 0. Previously, this option also
  185. disabled descriptor cache lookup, thus breaking hidden services
  186. entirely. Fixes bug 18704; bugfix on Patch by "twim".
  187. - Clients now require hidden services to include the TAP keys for
  188. their intro points in the hidden service descriptor. This prevents
  189. an inadvertent upgrade to ntor, which a malicious hidden service
  190. could use to distinguish clients by consensus version. Fixes bug
  191. 20012; bugfix on Patch by teor.
  192. o Major bugfixes (relay, resolver, logging):
  193. - For relays that don't know their own address, avoid attempting a
  194. local hostname resolve for each descriptor we download. This
  195. will cut down on the number of "Success: chose address 'x.x.x.x'"
  196. log lines, and also avoid confusing clock jumps if the resolver
  197. is slow. Fixes bugs 20423 and 20610; bugfix on
  198. o Minor features (port flags):
  199. - Add new flags to the *Port options to give finer control over which
  200. requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
  201. and the synthetic flag OnionTrafficOnly, which is equivalent to
  202. NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
  203. 18693; patch by "teor".
  204. o Minor features (build, hardening):
  205. - Detect and work around a libclang_rt problem that would prevent
  206. clang from finding __mulodi4() on some 32-bit platforms, and thus
  207. keep -ftrapv from linking on those systems. Closes ticket 19079.
  208. - When building on a system without runtime support for the runtime
  209. hardening options, try to log a useful warning at configuration
  210. time, rather than an incomprehensible warning at link time. If
  211. expensive hardening was requested, this warning becomes an error.
  212. Closes ticket 18895.
  213. o Minor features (client, directory):
  214. - Since authorities now omit all routers that lack the Running and
  215. Valid flags, we assume that any relay listed in the consensus must
  216. have those flags. Closes ticket 20001; implements part of
  217. proposal 272.
  218. o Minor features (code safety):
  219. - In our integer-parsing functions, ensure that the maximum value we
  220. allow is no smaller than the minimum value. Closes ticket 19063;
  221. patch from "U+039b".
  222. o Minor features (compilation, portability):
  223. - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
  224. ticket 20241.
  225. o Minor features (config):
  226. - Warn users when descriptor and port addresses are inconsistent.
  227. Mitigates bug 13953; patch by teor.
  228. o Minor features (controller):
  229. - Allow controllers to configure basic client authorization on
  230. hidden services when they create them with the ADD_ONION controller
  231. command. Implements ticket 15588. Patch by "special".
  232. - Fire a STATUS_SERVER controller event whenever the hibernation
  233. status changes between "awake"/"soft"/"hard". Closes ticket 18685.
  234. - Implement new GETINFO queries for all downloads that use
  235. download_status_t to schedule retries. This allows controllers to
  236. examine the schedule for pending downloads. Closes ticket 19323.
  237. o Minor features (development tools, etags):
  238. - Teach the "make tags" Makefile target how to correctly find
  239. "MOCK_IMPL" function definitions. Patch from nherring; closes
  240. ticket 16869.
  241. o Minor features (directory authority):
  242. - After voting, if the authorities decide that a relay is not
  243. "Valid", they no longer include it in the consensus at all. Closes
  244. ticket 20002; implements part of proposal 272.
  245. - Directory authorities now only give the Guard flag to a relay if
  246. they are also giving it the Stable flag. This change allows us to
  247. simplify path selection for clients. It should have minimal effect
  248. in practice, since >99% of Guards already have the Stable flag.
  249. Implements ticket 18624.
  250. - Directory authorities now write their v3-status-votes file out to
  251. disk earlier in the consensus process, so we have a record of the
  252. votes even if we abort the consensus process. Resolves
  253. ticket 19036.
  254. o Minor features (fallback directory list, new since
  255. - Replace the 81 remaining fallbacks of the 100 originally
  256. introduced in Tor in March 2016, with a list of 177
  257. fallbacks (123 new, 54 existing, 27 removed) generated in December
  258. 2016. Resolves ticket 20170.
  259. o Minor features (hidden service):
  260. - Stop being so strict about the payload length of "rendezvous1"
  261. cells. We used to be locked in to the "TAP" handshake length, and
  262. now we can handle better handshakes like "ntor". Resolves
  263. ticket 18998.
  264. o Minor features (infrastructure, time):
  265. - Tor now includes an improved timer backend, so that we can
  266. efficiently support tens or hundreds of thousands of concurrent
  267. timers, as will be needed for some of our planned anti-traffic-
  268. analysis work. This code is based on William Ahern's "timeout.c"
  269. project, which implements a "tickless hierarchical timing wheel".
  270. Closes ticket 18365.
  271. - Tor now uses the operating system's monotonic timers (where
  272. available) for internal fine-grained timing. Previously we would
  273. look at the system clock, and then attempt to compensate for the
  274. clock running backwards. Closes ticket 18908.
  275. o Minor features (logging):
  276. - Add a set of macros to check nonfatal assertions, for internal
  277. use. Migrating more of our checks to these should help us avoid
  278. needless crash bugs. Closes ticket 18613.
  279. - Provide a more useful warning message when configured with an
  280. invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
  281. - When dumping unparseable router descriptors, optionally store them
  282. in separate files, named by digest, up to a configurable size
  283. limit. You can change the size limit by setting the
  284. MaxUnparseableDescSizeToLog option, and disable this feature by
  285. setting that option to 0. Closes ticket 18322.
  286. o Minor features (performance):
  287. - Change the "optimistic data" extension from "off by default" to
  288. "on by default". The default was ordinarily overridden by a
  289. consensus option, but when clients were bootstrapping for the
  290. first time, they would not have a consensus to get the option
  291. from. Changing this default saves a round-trip during startup.
  292. Closes ticket 18815.
  293. o Minor features (relay, usability):
  294. - When the directory authorities refuse a bad relay's descriptor,
  295. encourage the relay operator to contact us. Many relay operators
  296. won't notice this line in their logs, but it's a win if even a few
  297. learn why we don't like what their relay was doing. Resolves
  298. ticket 18760.
  299. o Minor features (security, TLS):
  300. - Servers no longer support clients that lack AES ciphersuites.
  301. (3DES is no longer considered an acceptable cipher.) We believe
  302. that no such Tor clients currently exist, since Tor has required
  303. OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
  304. o Minor features (testing):
  305. - Disable memory protections on OpenBSD when performing our unit
  306. tests for memwipe(). The test deliberately invokes undefined
  307. behavior, and the OpenBSD protections interfere with this. Patch
  308. from "rubiate". Closes ticket 20066.
  309. - Move the script to chutney, and modify tor's test-
  310. to call the (newer) chutney version when available.
  311. Resolves ticket 19116. Patch by teor.
  312. - Use the lcov convention for marking lines as unreachable, so that
  313. we don't count them when we're generating test coverage data.
  314. Update our coverage tools to understand this convention. Closes
  315. ticket 16792.
  316. - Our link-handshake unit tests now check that when invalid
  317. handshakes fail, they fail with the error messages we expected.
  318. - Our unit testing code that captures log messages no longer
  319. prevents them from being written out if the user asked for them
  320. (by passing --debug or --info or --notice or --warn to the "test"
  321. binary). This change prevents us from missing unexpected log
  322. messages simply because we were looking for others. Related to
  323. ticket 19999.
  324. - The unit tests now log all warning messages with the "BUG" flag.
  325. Previously, they only logged errors by default. This change will
  326. help us make our testing code more correct, and make sure that we
  327. only hit this code when we mean to. In the meantime, however,
  328. there will be more warnings in the unit test logs than before.
  329. This is preparatory work for ticket 19999.
  330. - The unit tests now treat any failure of a "tor_assert_nonfatal()"
  331. assertion as a test failure.
  332. - We've done significant work to make the unit tests run faster.
  333. o Minor features (testing, ipv6):
  334. - Add the hs-ipv6 chutney target to make test-network-all's IPv6
  335. tests. Remove bridges+hs, as it's somewhat redundant. This
  336. requires a recent chutney version that supports IPv6 clients,
  337. relays, and authorities. Closes ticket 20069; patch by teor.
  338. - Add the single-onion and single-onion-ipv6 chutney targets to
  339. "make test-network-all". This requires a recent chutney version
  340. with the single onion network flavors (git c72a652 or later).
  341. Closes ticket 20072; patch by teor.
  342. o Minor features (Tor2web):
  343. - Make Tor2web clients respect ReachableAddresses. This feature was
  344. inadvertently enabled in, then removed by bugfix 19973 on
  345. Implements feature 20034. Patch by teor.
  346. o Minor features (unix domain sockets):
  347. - When configuring a unix domain socket for a SocksPort,
  348. ControlPort, or Hidden service, you can now wrap the address in
  349. quotes, using C-style escapes inside the quotes. This allows unix
  350. domain socket paths to contain spaces. Resolves ticket 18753.
  351. o Minor features (user interface):
  352. - Tor now supports the ability to declare options deprecated, so
  353. that we can recommend that people stop using them. Previously, this
  354. was done in an ad-hoc way. There is a new --list-deprecated-options
  355. command-line option to list all of the deprecated options. Closes
  356. ticket 19820.
  357. o Minor features (virtual addresses):
  358. - Increase the maximum number of bits for the IPv6 virtual network
  359. prefix from 16 to 104. In this way, the condition for address
  360. allocation is less restrictive. Closes ticket 20151; feature
  361. on
  362. o Minor bug fixes (circuits):
  363. - Use the CircuitBuildTimeout option whenever
  364. LearnCircuitBuildTimeout is disabled. Previously, we would respect
  365. the option when a user disabled it, but not when it was disabled
  366. because some other option was set. Fixes bug 20073; bugfix on
  367. Patch by teor.
  368. o Minor bugfixes (build):
  369. - The current Git revision when building from a local repository is
  370. now detected correctly when using git worktrees. Fixes bug 20492;
  371. bugfix on
  372. o Minor bugfixes (relay address discovery):
  373. - Stop reordering IP addresses returned by the OS. This makes it
  374. more likely that Tor will guess the same relay IP address every
  375. time. Fixes issue 20163; bugfix on, ticket 17027.
  376. Reported by René Mayrhofer, patch by "cypherpunks".
  377. o Minor bugfixes (memory allocation):
  378. - Change how we allocate memory for large chunks on buffers, to
  379. avoid a (currently impossible) integer overflow, and to waste less
  380. space when allocating unusually large chunks. Fixes bug 20081;
  381. bugfix on Issue identified by Guido Vranken.
  382. o Minor bugfixes (bootstrap):
  383. - Remember the directory server we fetched the consensus or previous
  384. certificates from, and use it to fetch future authority
  385. certificates. This change improves bootstrapping performance.
  386. Fixes bug 18963; bugfix on
  387. o Minor bugfixes (circuits):
  388. - Make sure extend_info_from_router() is only called on servers.
  389. Fixes bug 19639; bugfix on
  390. o Minor bugfixes (client, fascistfirewall):
  391. - Avoid spurious warnings when ReachableAddresses or FascistFirewall
  392. is set. Fixes bug 20306; bugfix on
  393. o Minor bugfixes (client, unix domain sockets):
  394. - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
  395. the client address is meaningless. Fixes bug 20261; bugfix
  396. on
  397. o Minor bugfixes (code style):
  398. - Fix an integer signedness conversion issue in the case conversion
  399. tables. Fixes bug 19168; bugfix on
  400. o Minor bugfixes (compilation):
  401. - Build correctly on versions of libevent2 without support for
  402. evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
  403. on
  404. - When building with Clang, use a full set of GCC warnings.
  405. (Previously, we included only a subset, because of the way we
  406. detected them.) Fixes bug 19216; bugfix on
  407. - Detect Libevent2 functions correctly on systems that provide
  408. libevent2, but where libevent1 is linked with -levent. Fixes bug
  409. 19904; bugfix on Patch from Rubiate.
  410. - Run correctly when built on Windows build environments that
  411. require _vcsprintf(). Fixes bug 20560; bugfix on
  412. o Minor bugfixes (configuration):
  413. - When parsing quoted configuration values from the torrc file,
  414. handle Windows line endings correctly. Fixes bug 19167; bugfix on
  415. Patch from "Pingl".
  416. o Minor bugfixes (directory authority):
  417. - Authorities now sort the "package" lines in their votes, for ease
  418. of debugging. (They are already sorted in consensus documents.)
  419. Fixes bug 18840; bugfix on
  420. - Die with a more useful error when the operator forgets to place
  421. the authority_signing_key file into the keys directory. This
  422. avoids an uninformative assert & traceback about having an invalid
  423. key. Fixes bug 20065; bugfix on
  424. - When allowing private addresses, mark Exits that only exit to
  425. private locations as such. Fixes bug 20064; bugfix
  426. on
  427. - When parsing a detached signature, make sure we use the length of
  428. the digest algorithm instead of a hardcoded DIGEST256_LEN in
  429. order to avoid comparing bytes out-of-bounds with a smaller digest
  430. length such as SHA1. Fixes bug 19066; bugfix on
  431. o Minor bugfixes (getpass):
  432. - Defensively fix a non-triggerable heap corruption at do_getpass()
  433. to protect ourselves from mistakes in the future. Fixes bug
  434. 19223; bugfix on Bug found by Guido Vranken, patch
  435. by nherring.
  436. o Minor bugfixes (guard selection):
  437. - Don't mark guards as unreachable if connection_connect() fails.
  438. That function fails for local reasons, so it shouldn't reveal
  439. anything about the status of the guard. Fixes bug 14334; bugfix
  440. on
  441. - Use a single entry guard even if the NumEntryGuards consensus
  442. parameter is not provided. Fixes bug 17688; bugfix
  443. on
  444. o Minor bugfixes (hidden services):
  445. - Increase the minimum number of internal circuits we preemptively
  446. build from 2 to 3, so a circuit is available when a client
  447. connects to another onion service. Fixes bug 13239; bugfix
  448. on
  449. - Allow hidden services to run on IPv6 addresses even when the
  450. IPv6Exit option is not set. Fixes bug 18357; bugfix
  451. on
  452. - Stop logging intro point details to the client log on certain
  453. error conditions. Fixed as part of bug 20012; bugfix on
  454. Patch by teor.
  455. - When deleting an ephemeral hidden service, close its intro points
  456. even if they are not completely open. Fixes bug 18604; bugfix
  457. on
  458. - When configuring hidden services, check every hidden service
  459. directory's permissions. Previously, we only checked the last
  460. hidden service. Fixes bug 20529; bugfix on
  461. o Minor bugfixes (IPv6, testing):
  462. - Check for IPv6 correctly on Linux when running test networks.
  463. Fixes bug 19905; bugfix on; patch by teor.
  464. o Minor bugfixes (Linux seccomp2 sandbox):
  465. - Add permission to run the sched_yield() and sigaltstack() system
  466. calls, in order to support versions of Tor compiled with asan or
  467. ubsan code that use these calls. Now "sandbox 1" and
  468. "--enable-expensive-hardening" should be compatible on more
  469. systems. Fixes bug 20063; bugfix on
  470. o Minor bugfixes (logging):
  471. - Downgrade a harmless log message about the
  472. pending_entry_connections list from "warn" to "info". Mitigates
  473. bug 19926.
  474. - Log a more accurate message when we fail to dump a microdescriptor.
  475. Fixes bug 17758; bugfix on Patch from Daniel Pinto.
  476. - When logging a directory ownership mismatch, log the owning
  477. username correctly. Fixes bug 19578; bugfix on
  478. - When we are unable to remove the bw_accounting file, do not warn
  479. if the reason we couldn't remove it was that it didn't exist.
  480. Fixes bug 19964; bugfix on Patch from pastly.
  481. o Minor bugfixes (memory leak):
  482. - Fix a series of slow memory leaks related to parsing torrc files
  483. and options. Fixes bug 19466; bugfix on
  484. - Avoid a small memory leak when informing worker threads about
  485. rotated onion keys. Fixes bug 20401; bugfix on
  486. - Fix a small memory leak when receiving AF_UNIX connections on a
  487. SocksPort. Fixes bug 20716; bugfix on
  488. - When moving a signed descriptor object from a source to an
  489. existing destination, free the allocated memory inside that
  490. destination object. Fixes bug 20715; bugfix on
  491. - Fix a memory leak and use-after-free error when removing entries
  492. from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
  493. Patch from "cypherpunks".
  494. - Fix a small, uncommon memory leak that could occur when reading a
  495. truncated ed25519 key file. Fixes bug 18956; bugfix
  496. on
  497. o Minor bugfixes (option parsing):
  498. - Count unix sockets when counting client listeners (SOCKS, Trans,
  499. NATD, and DNS). This has no user-visible behavior changes: these
  500. options are set once, and never read. Required for correct
  501. behavior in ticket 17178. Fixes bug 19677; bugfix on
  502. Patch by teor.
  503. o Minor bugfixes (options):
  504. - Check the consistency of UseEntryGuards and EntryNodes more
  505. reliably. Fixes bug 20074; bugfix on Patch
  506. by teor.
  507. - Stop changing the configured value of UseEntryGuards on
  508. authorities and Tor2web clients. Fixes bug 20074; bugfix on
  509. commits 51fc6799 in and acda1735 in
  510. Patch by teor.
  511. o Minor bugfixes (relay):
  512. - Ensure relays don't make multiple connections during bootstrap.
  513. Fixes bug 20591; bugfix on
  514. - Do not try to parallelize workers more than 16x without the user
  515. explicitly configuring us to do so, even if we do detect more than
  516. 16 CPU cores. Fixes bug 19968; bugfix on
  517. o Minor bugfixes (testing):
  518. - The test-stem and test-network makefile targets now depend only on
  519. the tor binary that they are testing. Previously, they depended on
  520. "make all". Fixes bug 18240; bugfix on Based on a
  521. patch from "cypherpunks".
  522. - Allow clients to retry HSDirs much faster in test networks. Fixes
  523. bug 19702; bugfix on Patch by teor.
  524. - Avoid a unit test failure on systems with over 16 detectable CPU
  525. cores. Fixes bug 19968; bugfix on
  526. - Let backtrace tests work correctly under AddressSanitizer:
  527. disable ASAN's detection of segmentation faults while running
  528., so that we can make sure that our own backtrace
  529. generation code works. Fixes bug 18934; bugfix
  530. on Patch from "cypherpunks".
  531. - Fix the test-network-all target on out-of-tree builds by using the
  532. correct path to the test driver script. Fixes bug 19421; bugfix
  533. on
  534. - Stop spurious failures in the local interface address discovery
  535. unit tests. Fixes bug 20634; bugfix on; patch by
  536. Neel Chauhan.
  537. - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
  538. removed the ECDH ciphers which caused the tests to fail on
  539. platforms which use it. Fixes bug 20460; bugfix on
  540. - The tor_tls_server_info_callback unit test no longer crashes when
  541. debug-level logging is turned on. Fixes bug 20041; bugfix
  542. on
  543. o Minor bugfixes (time):
  544. - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
  545. bugfix on all released tor versions.
  546. - When computing the difference between two times in milliseconds,
  547. we now round to the nearest millisecond correctly. Previously, we
  548. could sometimes round in the wrong direction. Fixes bug 19428;
  549. bugfix on
  550. o Minor bugfixes (Tor2web):
  551. - Prevent Tor2web clients from running hidden services: these services
  552. are not anonymous due to the one-hop client paths. Fixes bug
  553. 19678. Patch by teor.
  554. o Minor bugfixes (user interface):
  555. - Display a more accurate number of suppressed messages in the log
  556. rate-limiter. Previously, there was a potential integer overflow
  557. in the counter. Now, if the number of messages hits a maximum, the
  558. rate-limiter doesn't count any further. Fixes bug 19435; bugfix
  559. on
  560. - Fix a typo in the passphrase prompt for the ed25519 identity key.
  561. Fixes bug 19503; bugfix on
  562. o Code simplification and refactoring:
  563. - Remove redundant declarations of the MIN macro. Closes
  564. ticket 18889.
  565. - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
  566. Closes ticket 18462; patch from "icanhasaccount".
  567. - Split the 600-line directory_handle_command_get function into
  568. separate functions for different URL types. Closes ticket 16698.
  569. o Documentation:
  570. - Add module-level internal documentation for 36 C files that
  571. previously didn't have a high-level overview. Closes ticket 20385.
  572. - Correct the IPv6 syntax in our documentation for the
  573. VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
  574. - Correct the minimum bandwidth value in torrc.sample, and queue a
  575. corresponding change for torrc.minimal. Closes ticket 20085.
  576. - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
  577. ticket 19153. Patch from "U+039b".
  578. - Module-level documentation for several more modules. Closes
  579. tickets 19287 and 19290.
  580. - Document the --passphrase-fd option in the tor manpage. Fixes bug
  581. 19504; bugfix on
  582. - Document the default PathsNeededToBuildCircuits value that's used
  583. by clients when the directory authorities don't set
  584. min_paths_for_circs_pct. Fixes bug 20117; bugfix on
  585. Patch by teor, reported by Jesse V.
  586. - Fix manual for the User option: it takes a username, not a UID.
  587. Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
  588. a manpage!).
  589. - Fix the description of the --passphrase-fd option in the
  590. tor-gencert manpage. The option is used to pass the number of a
  591. file descriptor to read the passphrase from, not to read the file
  592. descriptor from. Fixes bug 19505; bugfix on
  593. o Removed code:
  594. - We no longer include the (dead, deprecated) bufferevent code in
  595. Tor. Closes ticket 19450. Based on a patch from "U+039b".
  596. o Removed features:
  597. - Remove support for "GET /tor/bytes.txt" DirPort request, and
  598. "GETINFO dir-usage" controller request, which were only available
  599. via a compile-time option in Tor anyway. Feature was added in
  600. Resolves ticket 19035.
  601. - There is no longer a compile-time option to disable support for
  602. TransPort. (If you don't want TransPort, just don't use it.) Patch
  603. from "U+039b". Closes ticket 19449.
  604. o Testing:
  605. - Run more workqueue tests as part of "make check". These had
  606. previously been implemented, but you needed to know special
  607. command-line options to enable them.
  608. - We now have unit tests for our code to reject zlib "compression
  609. bombs". (Fortunately, the code works fine.)
  610. Changes in version - 2016-12-08
  611. Tor backports fixes for additional portability issues that
  612. could prevent Tor from building correctly on OSX Sierra, or with
  613. OpenSSL 1.1. Affected users should upgrade; others can safely stay
  614. with
  615. o Minor bugfixes (portability):
  616. - Avoid compilation errors when building on OSX Sierra. Sierra began
  617. to support the getentropy() and clock_gettime() APIs, but created
  618. a few problems in doing so. Tor 0.2.9 has a more thorough set of
  619. workarounds; in 0.2.8, we are just using the /dev/urandom and mach
  620. monotonic time interfaces. Fixes bug 20865. Bugfix
  621. on
  622. o Minor bugfixes (portability, backport from
  623. - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
  624. architectures. Closes ticket 20588.
  625. Changes in version - 2016-12-02
  626. Tor backports a fix for a bug that would sometimes make clients
  627. unusable after they left standby mode. It also backports fixes for
  628. a few portability issues and a small but problematic memory leak.
  629. o Major bugfixes (client reliability, backport from
  630. - When Tor leaves standby because of a new application request, open
  631. circuits as needed to serve that request. Previously, we would
  632. potentially wait a very long time. Fixes part of bug 19969; bugfix
  633. on
  634. o Major bugfixes (client performance, backport from
  635. - Clients now respond to new application stream requests immediately
  636. when they arrive, rather than waiting up to one second before
  637. starting to handle them. Fixes part of bug 19969; bugfix
  638. on
  639. o Minor bugfixes (portability, backport from
  640. - Work around a bug in the OSX 10.12 SDK that would prevent us from
  641. successfully targeting earlier versions of OSX. Resolves
  642. ticket 20235.
  643. o Minor bugfixes (portability, backport from
  644. - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
  645. 20551; bugfix on
  646. o Minor bugfixes (relay, backport from
  647. - Work around a memory leak in OpenSSL 1.1 when encoding public
  648. keys. Fixes bug 20553; bugfix on 0.0.2pre8.
  649. o Minor features (geoip):
  650. - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
  651. Country database.
  652. Changes in version - 2016-10-17
  653. Tor backports a fix for a security hole in previous versions
  654. of Tor that would allow a remote attacker to crash a Tor client,
  655. hidden service, relay, or authority. All Tor users should upgrade to
  656. this version, or to Patches will be released for older
  657. versions of Tor.
  658. o Major features (security fixes, also in
  659. - Prevent a class of security bugs caused by treating the contents
  660. of a buffer chunk as if they were a NUL-terminated string. At
  661. least one such bug seems to be present in all currently used
  662. versions of Tor, and would allow an attacker to remotely crash
  663. most Tor instances, especially those compiled with extra compiler
  664. hardening. With this defense in place, such bugs can't crash Tor,
  665. though we should still fix them as they occur. Closes ticket
  666. 20384 (TROVE-2016-10-001).
  667. o Minor features (geoip):
  668. - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
  669. Country database.
  670. Changes in version - 2016-09-23
  671. Tor fixes two crash bugs present in previous versions of the
  672. 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
  673. who select public relays as their bridges.
  674. o Major bugfixes (crash):
  675. - Fix a complicated crash bug that could affect Tor clients
  676. configured to use bridges when replacing a networkstatus consensus
  677. in which one of their bridges was mentioned. OpenBSD users saw
  678. more crashes here, but all platforms were potentially affected.
  679. Fixes bug 20103; bugfix on
  680. o Major bugfixes (relay, OOM handler):
  681. - Fix a timing-dependent assertion failure that could occur when we
  682. tried to flush from a circuit after having freed its cells because
  683. of an out-of-memory condition. Fixes bug 20203; bugfix on
  684. Thanks to "cypherpunks" for help diagnosing
  685. this one.
  686. o Minor feature (fallback directories):
  687. - Remove broken fallbacks from the hard-coded fallback directory
  688. list. Closes ticket 20190; patch by teor.
  689. o Minor features (geoip):
  690. - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
  691. Country database.
  692. Changes in version - 2016-08-24
  693. Tor fixes an important bug related to the ReachableAddresses
  694. option in, and replaces a retiring bridge authority. Everyone
  695. who sets the ReachableAddresses option, and all bridges, are strongly
  696. encouraged to upgrade.
  697. o Directory authority changes:
  698. - The "Tonga" bridge authority has been retired; the new bridge
  699. authority is "Bifroest". Closes tickets 19728 and 19690.
  700. o Major bugfixes (client, security):
  701. - Only use the ReachableAddresses option to restrict the first hop
  702. in a path. In earlier versions of 0.2.8.x, it would apply to
  703. every hop in the path, with a possible degradation in anonymity
  704. for anyone using an uncommon ReachableAddress setting. Fixes bug
  705. 19973; bugfix on
  706. o Minor features (geoip):
  707. - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
  708. Country database.
  709. o Minor bugfixes (compilation):
  710. - Remove an inappropriate "inline" in tortls.c that was causing
  711. warnings on older versions of GCC. Fixes bug 19903; bugfix
  712. on
  713. o Minor bugfixes (fallback directories):
  714. - Avoid logging a NULL string pointer when loading fallback
  715. directory information. Fixes bug 19947; bugfix on
  716. and Report and patch by "rubiate".
  717. Changes in version - 2016-08-02
  718. Tor is the first stable version of the Tor 0.2.8 series.
  719. The Tor 0.2.8 series improves client bootstrapping performance,
  720. completes the authority-side implementation of improved identity
  721. keys for relays, and includes numerous bugfixes and performance
  722. improvements throughout the program. This release continues to
  723. improve the coverage of Tor's test suite. For a full list of
  724. changes since Tor 0.2.7, see the ReleaseNotes file.
  725. Below is a list of the changes since Tor 0.2.7.
  726. o New system requirements:
  727. - Tor no longer attempts to support platforms where the "time_t"
  728. type is unsigned. (To the best of our knowledge, only OpenVMS does
  729. this, and Tor has never actually built on OpenVMS.) Closes
  730. ticket 18184.
  731. - Tor no longer supports versions of OpenSSL with a broken
  732. implementation of counter mode. (This bug was present in OpenSSL
  733. 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
  734. longer runs with, these versions.
  735. - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
  736. later (released in 2008 and 2009 respectively). If you are
  737. building Tor from the git repository instead of from the source
  738. distribution, and your tools are older than this, you will need to
  739. upgrade. Closes ticket 17732.
  740. o Directory authority changes:
  741. - Update the V3 identity key for the dannenberg directory authority:
  742. it was changed on 18 November 2015. Closes task 17906. Patch
  743. by teor.
  744. - Urras is no longer a directory authority. Closes ticket 19271.
  745. o Major features (directory system):
  746. - Include a trial list of default fallback directories, based on an
  747. opt-in survey of suitable relays. Doing this should make clients
  748. bootstrap more quickly and reliably, and reduce the load on the
  749. directory authorities. Closes ticket 15775. Patch by teor.
  750. Candidates identified using an OnionOO script by weasel, teor,
  751. gsathya, and karsten.
  752. - Previously only relays that explicitly opened a directory port
  753. (DirPort) accepted directory requests from clients. Now all
  754. relays, with and without a DirPort, accept and serve tunneled
  755. directory requests that they receive through their ORPort. You can
  756. disable this behavior using the new DirCache option. Closes
  757. ticket 12538.
  758. - When bootstrapping multiple consensus downloads at a time, use the
  759. first one that starts downloading, and close the rest. This
  760. reduces failures when authorities or fallback directories are slow
  761. or down. Together with the code for feature 15775, this feature
  762. should reduces failures due to fallback churn. Implements ticket
  763. 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
  764. mikeperry and teor.
  765. o Major features (security, Linux):
  766. - When Tor starts as root on Linux and is told to switch user ID, it
  767. can now retain the capability to bind to low ports. By default,
  768. Tor will do this only when it's switching user ID and some low
  769. ports have been configured. You can change this behavior with the
  770. new option KeepBindCapabilities. Closes ticket 8195.
  771. o Major bugfixes (client, bootstrapping):
  772. - Check if bootstrap consensus downloads are still needed when the
  773. linked connection attaches. This prevents tor making unnecessary
  774. begindir-style connections, which are the only directory
  775. connections tor clients make since the fix for 18483 was merged.
  776. - Fix some edge cases where consensus download connections may not
  777. have been closed, even though they were not needed. Related to fix
  778. for 18809.
  779. - Make relays retry consensus downloads the correct number of times,
  780. rather than the more aggressive client retry count. Fixes part of
  781. ticket 18809.
  782. o Major bugfixes (dns proxy mode, crash):
  783. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  784. bugfix on Patch from "cypherpunks".
  785. o Major bugfixes (ed25519, voting):
  786. - Actually enable support for authorities to match routers by their
  787. Ed25519 identities. Previously, the code had been written, but
  788. some debugging code that had accidentally been left in the
  789. codebase made it stay turned off. Fixes bug 17702; bugfix
  790. on
  791. - When collating votes by Ed25519 identities, authorities now
  792. include a "NoEdConsensus" flag if the ed25519 value (or lack
  793. thereof) for a server does not reflect the majority consensus.
  794. Related to bug 17668; bugfix on
  795. - When generating a vote with keypinning disabled, never include two
  796. entries for the same ed25519 identity. This bug was causing
  797. authorities to generate votes that they could not parse when a
  798. router violated key pinning by changing its RSA identity but
  799. keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
  800. 18318. Bugfix on
  801. o Major bugfixes (key management):
  802. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  803. pointer to the previous (uninitialized) key value. The impact here
  804. should be limited to a difficult-to-trigger crash, if OpenSSL is
  805. running an engine that makes key generation failures possible, or
  806. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  807. Found by Yuan Jochen Kang, Suman Jana, and
  808. Baishakhi Ray.
  809. o Major bugfixes (security, client, DNS proxy):
  810. - Stop a crash that could occur when a client running with DNSPort
  811. received a query with multiple address types, and the first
  812. address type was not supported. Found and fixed by Scott Dial.
  813. Fixes bug 18710; bugfix on
  814. o Major bugfixes (security, compilation):
  815. - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
  816. is predefined. Previously, our use of -D_FORTIFY_SOURCE would
  817. cause a compiler warning, thereby making other checks fail, and
  818. needlessly disabling compiler-hardening support. Fixes one case of
  819. bug 18841; bugfix on Patch from "trudokal".
  820. - Repair hardened builds under the clang compiler. Previously, our
  821. use of _FORTIFY_SOURCE would conflict with clang's address
  822. sanitizer. Fixes bug 14821; bugfix on
  823. o Major bugfixes (security, pointers):
  824. - Avoid a difficult-to-trigger heap corruption attack when extending
  825. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  826. bugfix on, which fixed a related bug incompletely.
  827. Reported by Guido Vranken.
  828. o Major bugfixes (testing):
  829. - Fix a bug that would block 'make test-network-all' on systems where
  830. IPv6 packets were lost. Fixes bug 19008; bugfix on
  831. o Major bugfixes (user interface):
  832. - Correctly give a warning in the cases where a relay is specified
  833. by nickname, and one such relay is found, but it is not officially
  834. Named. Fixes bug 19203; bugfix on
  835. o Minor features (accounting):
  836. - Added two modes to the AccountingRule option: One for limiting
  837. only the number of bytes sent ("AccountingRule out"), and one for
  838. limiting only the number of bytes received ("AccountingRule in").
  839. Closes ticket 15989; patch from "unixninja92".
  840. o Minor features (bug-resistance):
  841. - Make Tor survive errors involving connections without a
  842. corresponding event object. Previously we'd fail with an
  843. assertion; now we produce a log message. Related to bug 16248.
  844. - Use tor_snprintf() and tor_vsnprintf() even in external and low-
  845. level code, to harden against accidental failures to NUL-
  846. terminate. Part of ticket 17852. Patch from jsturgix. Found
  847. with Flawfinder.
  848. o Minor features (build):
  849. - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
  850. as having possible IPFW support. Closes ticket 18448. Patch from
  851. Steven Chamberlain.
  852. - Since our build process now uses "make distcheck", we no longer
  853. force "make dist" to depend on "make check". Closes ticket 17893;
  854. patch from "cypherpunks".
  855. - Tor now builds once again with the recent OpenSSL 1.1 development
  856. branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
  857. tracking OpenSSL 1.1 development as it has progressed, and fixing
  858. numerous compatibility issues as they arose. See tickets
  859. 17549, 17921, 17984, 19499, and 18286.
  860. - When building manual pages, set the timezone to "UTC", so that the
  861. output is reproducible. Fixes bug 19558; bugfix on
  862. Patch from intrigeri.
  863. o Minor features (clients):
  864. - Make clients, onion services, and bridge relays always use an
  865. encrypted begindir connection for directory requests. Resolves
  866. ticket 18483. Patch by teor.
  867. o Minor features (controller):
  868. - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
  869. controllers can examine the the reject rules added by
  870. ExitPolicyRejectPrivate. This makes it easier for stem to display
  871. exit policies.
  872. - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
  873. tickets 16774 and 17817. Patch by George Tankersley.
  874. - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
  875. service descriptor from a service's local hidden service
  876. descriptor cache. Closes ticket 14846.
  877. o Minor features (crypto):
  878. - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
  879. - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
  880. George Tankersley.
  881. - Improve performance when hashing non-multiple of 8 sized buffers,
  882. based on Andrew Moon's public domain SipHash-2-4 implementation.
  883. Fixes bug 17544; bugfix on
  884. - Validate the hard-coded Diffie-Hellman parameters and ensure that
  885. p is a safe prime, and g is a suitable generator. Closes
  886. ticket 18221.
  887. - When allocating a digest state object, allocate no more space than
  888. we actually need. Previously, we would allocate as much space as
  889. the state for the largest algorithm would need. This change saves
  890. up to 672 bytes per circuit. Closes ticket 17796.
  891. o Minor features (directory downloads):
  892. - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
  893. directory mirrors. The default is 1; set it to 0 to disable
  894. fallbacks. Implements ticket 17576. Patch by teor.
  895. - Wait for busy authorities and fallback directories to become non-
  896. busy when bootstrapping. (A similar change was made in 6c443e987d
  897. for directory caches chosen from the consensus.) Closes ticket
  898. 17864; patch by teor.
  899. o Minor features (geoip):
  900. - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
  901. Country database.
  902. o Minor features (hidden service directory):
  903. - Streamline relay-side hsdir handling: when relays consider whether
  904. to accept an uploaded hidden service descriptor, they no longer
  905. check whether they are one of the relays in the network that is
  906. "supposed" to handle that descriptor. Implements ticket 18332.
  907. o Minor features (IPv6):
  908. - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
  909. to 1, tor prefers IPv6 directory addresses.
  910. - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
  911. avoids using IPv4 for client OR and directory connections.
  912. - Add address policy assume_action support for IPv6 addresses.
  913. - Add an argument 'ipv6=address:orport' to the DirAuthority and
  914. FallbackDir torrc options, to specify an IPv6 address for an
  915. authority or fallback directory. Add hard-coded ipv6 addresses for
  916. directory authorities that have them. Closes ticket 17327; patch
  917. from Nick Mathewson and teor.
  918. - Allow users to configure directory authorities and fallback
  919. directory servers with IPv6 addresses and ORPorts. Resolves
  920. ticket 6027.
  921. - Limit IPv6 mask bits to 128.
  922. - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
  923. 17638; bugfix on 0.0.2pre8. Patch by teor.
  924. - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
  925. "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
  926. "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
  927. - Warn when comparing against an AF_UNSPEC address in a policy, it's
  928. almost always a bug. Closes ticket 17863; patch by teor.
  929. - routerset_parse now accepts IPv6 literal addresses. Fixes bug
  930. 17060; bugfix on Patch by teor.
  931. o Minor features (Linux seccomp2 sandbox):
  932. - Reject attempts to change our Address with "Sandbox 1" enabled.
  933. Changing Address with Sandbox turned on would never actually work,
  934. but previously it would fail in strange and confusing ways. Found
  935. while fixing 18548.
  936. o Minor features (logging):
  937. - When logging to syslog, allow a tag to be added to the syslog
  938. identity (the string prepended to every log message). The tag can
  939. be configured with SyslogIdentityTag and defaults to none. Setting
  940. it to "foo" will cause logs to be tagged as "Tor-foo". Closes
  941. ticket 17194.
  942. o Minor features (portability):
  943. - Use timingsafe_memcmp() where available. Closes ticket 17944;
  944. patch from <>.
  945. o Minor features (relay, address discovery):
  946. - Add a family argument to get_interface_addresses_raw() and
  947. subfunctions to make network interface address interogation more
  948. efficient. Now Tor can specifically ask for IPv4, IPv6 or both
  949. types of interfaces from the operating system. Resolves
  950. ticket 17950.
  951. - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
  952. fails to enumerate interface addresses using the platform-specific
  953. API, have it rely on the UDP socket fallback technique to try and
  954. find out what IP addresses (both IPv4 and IPv6) our machine has.
  955. Resolves ticket 17951.
  956. o Minor features (replay cache):
  957. - The replay cache now uses SHA256 instead of SHA1. Implements
  958. feature 8961. Patch by teor, issue reported by rransom.
  959. o Minor features (robustness):
  960. - Exit immediately with an error message if the code attempts to use
  961. Libevent without having initialized it. This should resolve some
  962. frequently-made mistakes in our unit tests. Closes ticket 18241.
  963. o Minor features (security, clock):
  964. - Warn when the system clock appears to move back in time (when the
  965. state file was last written in the future). Tor doesn't know that
  966. consensuses have expired if the clock is in the past. Patch by
  967. teor. Implements ticket 17188.
  968. o Minor features (security, exit policies):
  969. - ExitPolicyRejectPrivate now rejects more private addresses by
  970. default. Specifically, it now rejects the relay's outbound bind
  971. addresses (if configured), and the relay's configured port
  972. addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
  973. Patch by teor.
  974. o Minor features (security, memory erasure):
  975. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  976. zero size. Check size argument to memwipe() for underflow. Fixes
  977. bug 18089; bugfix on and Reported by "gk",
  978. patch by teor.
  979. - Set the unused entries in a smartlist to NULL. This helped catch
  980. a (harmless) bug, and shouldn't affect performance too much.
  981. Implements ticket 17026.
  982. - Use SecureMemoryWipe() function to securely clean memory on
  983. Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
  984. Implements feature 17986.
  985. - Use explicit_bzero or memset_s when present. Previously, we'd use
  986. OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
  987. from <> and <>.
  988. o Minor features (security, RNG):
  989. - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
  990. positively are not allowed to fail. Previously we depended on
  991. internal details of OpenSSL's behavior. Closes ticket 17686.
  992. - Never use the system entropy output directly for anything besides
  993. seeding the PRNG. When we want to generate important keys, instead
  994. of using system entropy directly, we now hash it with the PRNG
  995. stream. This may help resist certain attacks based on broken OS
  996. entropy implementations. Closes part of ticket 17694.
  997. - Use modern system calls (like getentropy() or getrandom()) to
  998. generate strong entropy on platforms that have them. Closes
  999. ticket 13696.
  1000. o Minor features (security, win32):
  1001. - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
  1002. attack. Fixes bug 18123; bugfix on all tor versions. Patch
  1003. by teor.
  1004. o Minor features (unix domain sockets):
  1005. - Add a new per-socket option, RelaxDirModeCheck, to allow creating
  1006. Unix domain sockets without checking the permissions on the parent
  1007. directory. (Tor checks permissions by default because some
  1008. operating systems only check permissions on the parent directory.
  1009. However, some operating systems do look at permissions on the
  1010. socket, and tor's default check is unneeded.) Closes ticket 18458.
  1011. Patch by weasel.
  1012. o Minor features (unix file permissions):
  1013. - Defer creation of Unix sockets until after setuid. This avoids
  1014. needing CAP_CHOWN and CAP_FOWNER when using systemd's
  1015. CapabilityBoundingSet, or chown and fowner when using SELinux.
  1016. Implements part of ticket 17562. Patch from Jamie Nguyen.
  1017. - If any directory created by Tor is marked as group readable, the
  1018. filesystem group is allowed to be either the default GID or the
  1019. root user. Allowing root to read the DataDirectory prevents the
  1020. need for CAP_READ_SEARCH when using systemd's
  1021. CapabilityBoundingSet, or dac_read_search when using SELinux.
  1022. Implements part of ticket 17562. Patch from Jamie Nguyen.
  1023. - Introduce a new DataDirectoryGroupReadable option. If it is set to
  1024. 1, the DataDirectory will be made readable by the default GID.
  1025. Implements part of ticket 17562. Patch from Jamie Nguyen.
  1026. o Minor bugfixes (accounting):
  1027. - The max bandwidth when using 'AccountRule sum' is now correctly
  1028. logged. Fixes bug 18024; bugfix on Patch
  1029. from "unixninja92".
  1030. o Minor bugfixes (assert, portability):
  1031. - Fix an assertion failure in memarea.c on systems where "long" is
  1032. shorter than the size of a pointer. Fixes bug 18716; bugfix
  1033. on
  1034. o Minor bugfixes (bootstrap):
  1035. - Consistently use the consensus download schedule for authority
  1036. certificates. Fixes bug 18816; bugfix on
  1037. o Minor bugfixes (build):
  1038. - Avoid spurious failures from configure files related to calling
  1039. exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18625; bugfix on
  1040. Patch from "cypherpunks".
  1041. - Do not link the unit tests against both the testing and non-
  1042. testing versions of the static libraries. Fixes bug 18490; bugfix
  1043. on
  1044. - Resolve warnings when building on systems that are concerned with
  1045. signed char. Fixes bug 18728; bugfix on
  1046. and
  1047. - Silence spurious clang-scan warnings in the ed25519_donna code by
  1048. explicitly initializing some objects. Fixes bug 18384; bugfix on
  1049. Patch by teor.
  1050. - When libscrypt.h is found, but no libscrypt library can be linked,
  1051. treat libscrypt as absent. Fixes bug 19161; bugfix
  1052. on
  1053. - Cause the unit tests to compile correctly on mingw64 versions that
  1054. lack sscanf. Fixes bug 19213; bugfix on
  1055. - Don't try to use the pthread_condattr_setclock() function unless
  1056. it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
  1057. 17819; bugfix on
  1058. - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
  1059. on
  1060. - Fix search for libevent libraries on OpenBSD (and other systems
  1061. that install libevent 1 and libevent 2 in parallel). Fixes bug
  1062. 16651; bugfix on Patch from "rubiate".
  1063. - Isolate environment variables meant for tests from the rest of the
  1064. build system. Fixes bug 17818; bugfix on
  1065. - Mark all object files that include micro-revision.i as depending
  1066. on it, so as to make parallel builds more reliable. Fixes bug
  1067. 17826; bugfix on
  1068. - Remove config.log only from make distclean, not from make clean.
  1069. Fixes bug 17924; bugfix on
  1070. - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
  1071. on 0.0.2pre8.
  1072. - Remove an #endif from so that we correctly detect the
  1073. presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
  1074. on
  1075. o Minor bugfixes (client, bootstrap):
  1076. - Count receipt of new microdescriptors as progress towards
  1077. bootstrapping. Previously, with EntryNodes set, Tor might not
  1078. successfully repopulate the guard set on bootstrapping. Fixes bug
  1079. 16825; bugfix on
  1080. o Minor bugfixes (code correctness):
  1081. - Fix a bad memory handling bug that would occur if we had queued a
  1082. cell on a channel's incoming queue. Fortunately, we can't actually
  1083. queue a cell like that as our code is constructed today, but it's
  1084. best to avoid this kind of error, even if there isn't any code
  1085. that triggers it today. Fixes bug 18570; bugfix on
  1086. - Assert that allocated memory held by the reputation code is freed
  1087. according to its internal counters. Fixes bug 17753; bugfix
  1088. on
  1089. - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
  1090. bugfix on 0.0.6.
  1091. - Update to the latest version of Trunnel, which tries harder to
  1092. avoid generating code that can invoke memcpy(p,NULL,0). Bug found
  1093. by clang address sanitizer. Fixes bug 18373; bugfix
  1094. on
  1095. - When closing an entry connection, generate a warning if we should
  1096. have sent an end cell for it but we haven't. Fixes bug 17876;
  1097. bugfix on
  1098. o Minor bugfixes (configuration):
  1099. - Fix a tiny memory leak when parsing a port configuration ending in
  1100. ":auto". Fixes bug 18374; bugfix on
  1101. o Minor bugfixes (containers):
  1102. - If we somehow attempt to construct a heap with more than
  1103. 1073741822 elements, avoid an integer overflow when maintaining
  1104. the heap property. Fixes bug 18296; bugfix on
  1105. o Minor bugfixes (controller, microdescriptors):
  1106. - Make GETINFO dir/status-vote/current/consensus conform to the
  1107. control specification by returning "551 Could not open cached
  1108. consensus..." when not caching consensuses. Fixes bug 18920;
  1109. bugfix on
  1110. o Minor bugfixes (crypto):
  1111. - Check the return value of HMAC() and assert on failure. Fixes bug
  1112. 17658; bugfix on Patch by teor.
  1113. o Minor bugfixes (directories):
  1114. - When fetching extrainfo documents, compare their SHA256 digests
  1115. and Ed25519 signing key certificates with the routerinfo that led
  1116. us to fetch them, rather than with the most recent routerinfo.
  1117. Otherwise we generate many spurious warnings about mismatches.
  1118. Fixes bug 17150; bugfix on
  1119. - When generating a URL for a directory server on an IPv6 address,
  1120. wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
  1121. on Patch from Malek.
  1122. o Minor bugfixes (downloading):
  1123. - Predict more correctly whether we'll be downloading over HTTP when
  1124. we determine the maximum length of a URL. This should avoid a
  1125. "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
  1126. bug 19191.
  1127. o Minor bugfixes (exit policies, security):
  1128. - Refresh an exit relay's exit policy when interface addresses
  1129. change. Previously, tor only refreshed the exit policy when the
  1130. configured external address changed. Fixes bug 18208; bugfix on
  1131. Patch by teor.
  1132. o Minor bugfixes (fallback directories):
  1133. - Mark fallbacks as "too busy" when they return a 503 response,
  1134. rather than just marking authorities. Fixes bug 17572; bugfix on
  1135. Patch by teor.
  1136. - When requesting extrainfo descriptors from a trusted directory
  1137. server, check whether it is an authority or a fallback directory
  1138. which supports extrainfo descriptors. Fixes bug 18489; bugfix on
  1139. Reported by atagar, patch by teor.
  1140. o Minor bugfixes (hidden service, client):
  1141. - Handle the case where the user makes several fast consecutive
  1142. requests to the same .onion address. Previously, the first six
  1143. requests would each trigger a descriptor fetch, each picking a
  1144. directory (there are 6 overall) and the seventh one would fail
  1145. because no directories were left, thereby triggering a close on
  1146. all current directory connections asking for the hidden service.
  1147. The solution here is to not close the connections if we have
  1148. pending directory fetches. Fixes bug 15937; bugfix
  1149. on
  1150. o Minor bugfixes (hidden service, control port):
  1151. - Add the onion address to the HS_DESC event for the UPLOADED action
  1152. both on success or failure. It was previously hardcoded with
  1153. UNKNOWN. Fixes bug 16023; bugfix on
  1154. o Minor bugfixes (hidden service, directory):
  1155. - Bridges now refuse "rendezvous2" (hidden service descriptor)
  1156. publish attempts. Suggested by ticket 18332.
  1157. o Minor bugfixes (IPv6):
  1158. - Update the limits in max_dl_per_request for IPv6 address length.
  1159. Fixes bug 17573; bugfix on
  1160. o Minor bugfixes (Linux seccomp2 sandbox):
  1161. - Allow more syscalls when running with "Sandbox 1" enabled:
  1162. sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
  1163. some systems, these are required for Tor to start. Fixes bug
  1164. 18397; bugfix on Patch from Daniel Pinto.
  1165. - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
  1166. so that get_interface_address6_via_udp_socket_hack() can work.
  1167. Fixes bug 19660; bugfix on
  1168. - Allow the setrlimit syscall, and the prlimit and prlimit64
  1169. syscalls, which some libc implementations use under the hood.
  1170. Fixes bug 15221; bugfix on
  1171. - Avoid a 10-second delay when starting as a client with "Sandbox 1"
  1172. enabled and no DNS resolvers configured. This should help TAILS
  1173. start up faster. Fixes bug 18548; bugfix on
  1174. - Fix a crash when using offline master ed25519 keys with the Linux
  1175. seccomp2 sandbox enabled. Fixes bug 17675; bugfix on
  1176. - Allow statistics to be written to disk when "Sandbox 1" is
  1177. enabled. Fixes bugs 19556 and 19957; bugfix on and
  1178. respectively.
  1179. o Minor bugfixes (logging):
  1180. - In log messages that include a function name, use __FUNCTION__
  1181. instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
  1182. with clang __PRETTY_FUNCTION__ has extra information we don't
  1183. need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
  1184. der Woerdt.
  1185. - Remove needless quotes from a log message about unparseable
  1186. addresses. Fixes bug 17843; bugfix on
  1187. - Scrub service name in "unrecognized service ID" log messages.
  1188. Fixes bug 18600; bugfix on
  1189. - When logging information about an unparsable networkstatus vote or
  1190. consensus, do not say "vote" when we mean consensus. Fixes bug
  1191. 18368; bugfix on
  1192. - When we can't generate a signing key because OfflineMasterKey is
  1193. set, do not imply that we should have been able to load it. Fixes
  1194. bug 18133; bugfix on
  1195. - When logging a malformed hostname received through socks4, scrub
  1196. it if SafeLogging says we should. Fixes bug 17419; bugfix
  1197. on
  1198. o Minor bugfixes (memory safety):
  1199. - Avoid freeing an uninitialized pointer when opening a socket fails
  1200. in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
  1201. Reported by toralf and "cypherpunks", patch
  1202. by teor.
  1203. - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
  1204. 18672; bugfix on
  1205. - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
  1206. on
  1207. o Minor bugfixes (pluggable transports):
  1208. - Avoid reporting a spurious error when we decide that we don't need
  1209. to terminate a pluggable transport because it has already exited.
  1210. Fixes bug 18686; bugfix on
  1211. o Minor bugfixes (pointer arithmetic):
  1212. - Fix a bug in memarea_alloc() that could have resulted in remote
  1213. heap write access, if Tor had ever passed an unchecked size to
  1214. memarea_alloc(). Fortunately, all the sizes we pass to
  1215. memarea_alloc() are pre-checked to be less than 128 kilobytes.
  1216. Fixes bug 19150; bugfix on Bug found by
  1217. Guido Vranken.
  1218. o Minor bugfixes (private directory):
  1219. - Prevent a race condition when creating private directories. Fixes
  1220. part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
  1221. Patch from jsturgix. Found with Flawfinder.
  1222. o Minor bugfixes (relays):
  1223. - Check that both the ORPort and DirPort (if present) are reachable
  1224. before publishing a relay descriptor. Otherwise, relays publish a
  1225. descriptor with DirPort 0 when the DirPort reachability test takes
  1226. longer than the ORPort reachability test. Fixes bug 18050; bugfix
  1227. on Reported by "starlight", patch by teor.
  1228. - Resolve some edge cases where we might launch an ORPort
  1229. reachability check even when DisableNetwork is set. Noticed while
  1230. fixing bug 18616; bugfix on
  1231. o Minor bugfixes (relays, hidden services):
  1232. - Refuse connection requests to private OR addresses unless
  1233. ExtendAllowPrivateAddresses is set. Previously, tor would connect,
  1234. then refuse to send any cells to a private address. Fixes bugs
  1235. 17674 and 8976; bugfix on Patch by teor.
  1236. o Minor bugfixes (security, hidden services):
  1237. - Prevent hidden services connecting to client-supplied rendezvous
  1238. addresses that are reserved as internal or multicast. Fixes bug
  1239. 8976; bugfix on Patch by dgoulet and teor.
  1240. o Minor bugfixes (statistics):
  1241. - Consistently check for overflow in round_*_to_next_multiple_of
  1242. functions, and add unit tests with additional and maximal values.
  1243. Fixes part of bug 13192; bugfix on
  1244. - Handle edge cases in the laplace functions: avoid division by
  1245. zero, avoid taking the log of zero, and silence clang type
  1246. conversion warnings using round and trunc. Add unit tests for edge
  1247. cases with maximal values. Fixes part of bug 13192; bugfix
  1248. on
  1249. - We now include consensus downloads via IPv6 in our directory-
  1250. request statistics. Fixes bug 18460; bugfix on
  1251. o Minor bugfixes (test networks, IPv6):
  1252. - Allow internal IPv6 addresses in descriptors in test networks.
  1253. Fixes bug 17153; bugfix on Patch by teor, reported
  1254. by karsten.
  1255. o Minor bugfixes (testing):
  1256. - Check the full results of SHA256 and SHA512 digests in the unit
  1257. tests. Bugfix on Patch by teor.
  1258. - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
  1259. on
  1260. - Fix a small memory leak that would occur when the
  1261. TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
  1262. bugfix on
  1263. - Make unit tests pass on IPv6-only systems, and systems without
  1264. localhost addresses (like some FreeBSD jails). Fixes bug 17632;
  1265. bugfix on Patch by teor.
  1266. - The test for log_heartbeat was incorrectly failing in timezones
  1267. with non-integer offsets. Instead of comparing the end of the time
  1268. string against a constant, compare it to the output of
  1269. format_local_iso_time when given the correct input. Fixes bug
  1270. 18039; bugfix on
  1271. - We no longer disable assertions in the unit tests when coverage is
  1272. enabled. Instead, we require you to say --disable-asserts-in-tests
  1273. to the configure script if you need assertions disabled in the
  1274. unit tests (for example, if you want to perform branch coverage).
  1275. Fixes bug 18242; bugfix on
  1276. o Minor bugfixes (time handling):
  1277. - When correcting a corrupt 'struct tm' value, fill in the tm_wday
  1278. field. Otherwise, our unit tests crash on Windows. Fixes bug
  1279. 18977; bugfix on
  1280. - Avoid overflow in tor_timegm when parsing dates in and after 2038
  1281. on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
  1282. 0.0.2pre14. Patch by teor.
  1283. o Minor bugfixes (tor-gencert):
  1284. - Correctly handle the case where an authority operator enters a
  1285. passphrase but sends an EOF before sending a newline. Fixes bug
  1286. 17443; bugfix on Found by junglefowl.
  1287. o Code simplification and refactoring:
  1288. - Clean up a little duplicated code in
  1289. crypto_expand_key_material_TAP(). Closes ticket 17587; patch
  1290. from "pfrankw".
  1291. - Decouple the list of streams waiting to be attached to circuits
  1292. from the overall connection list. This change makes it possible to
  1293. attach streams quickly while simplifying Tor's callgraph and
  1294. avoiding O(N) scans of the entire connection list. Closes
  1295. ticket 17590.
  1296. - Extract the more complicated parts of circuit_mark_for_close()
  1297. into a new function that we run periodically before circuits are
  1298. freed. This change removes more than half of the functions
  1299. currently in the "blob". Closes ticket 17218.
  1300. - Move logging of redundant policy entries in
  1301. policies_parse_exit_policy_internal into its own function. Closes
  1302. ticket 17608; patch from "juce".
  1303. - Quote all the string interpolations in -- even those
  1304. which we are pretty sure can't contain spaces. Closes ticket
  1305. 17744. Patch from zerosion.
  1306. - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
  1307. use them. Closes ticket 17926.
  1308. - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
  1309. inplace, so there's no need to have a separate implementation for
  1310. the non-inplace code. Closes ticket 18258. Patch from Malek.
  1311. - Simplify return types for some crypto functions that can't
  1312. actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
  1313. - When a direct directory request fails immediately on launch,
  1314. instead of relaunching that request from inside the code that
  1315. launches it, instead mark the connection for teardown. This change
  1316. simplifies Tor's callback and prevents the directory-request
  1317. launching code from invoking itself recursively. Closes
  1318. ticket 17589.
  1319. o Documentation:
  1320. - Add a description of the correct use of the '--keygen' command-
  1321. line option. Closes ticket 17583; based on text by 's7r'.
  1322. - Change build messages to refer to "Fedora" instead of "Fedora
  1323. Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
  1324. Patches from "icanhasaccount" and "cypherpunks".
  1325. - Document the contents of the 'datadir/keys' subdirectory in the
  1326. manual page. Closes ticket 17621.
  1327. - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
  1328. - Explain actual minima for BandwidthRate. Closes ticket 16382.
  1329. - Fix a minor formatting typo in the manpage. Closes ticket 17791.
  1330. - Mention torspec URL in the manpage and point the reader to it
  1331. whenever we mention a document that belongs in torspce. Fixes
  1332. issue 17392.
  1333. - Stop recommending use of nicknames to identify relays in our
  1334. MapAddress documentation. Closes ticket 18312.
  1335. o Removed features:
  1336. - Remove client-side support for connecting to Tor relays running
  1337. versions of Tor before These relays didn't support
  1338. the v3 TLS handshake protocol, and are no longer allowed on the
  1339. Tor network. Implements the client side of ticket 11150. Based on
  1340. patches by Tom van der Woerdt.
  1341. - We no longer maintain an internal freelist in memarea.c.
  1342. Allocators should be good enough to make this code unnecessary,
  1343. and it's doubtful that it ever had any performance benefit.
  1344. o Testing:
  1345. - Add unit tests to check for common RNG failure modes, such as
  1346. returning all zeroes, identical values, or incrementing values
  1347. (OpenSSL's rand_predictable feature). Patch by teor.
  1348. - Always test both ed25519 backends, so that we can be sure that our
  1349. batch-open replacement code works. Part of ticket 16794.
  1350. - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
  1351. portion of ticket 16831.
  1352. - Fix several warnings from clang's address sanitizer produced in
  1353. the unit tests.
  1354. - Log more information when the backtrace tests fail. Closes ticket
  1355. 17892. Patch from "cypherpunks."
  1356. - More unit tests for compat_libevent.c, procmon.c, tortls.c,
  1357. util_format.c, directory.c, and options_validate.c. Closes tickets
  1358. 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
  1359. Ola Bini.
  1360. - Treat backtrace test failures as expected on FreeBSD until we
  1361. solve bug 17808. Closes ticket 18204.
  1362. - Unit tests for directory_handle_command_get. Closes ticket 17004.
  1363. Patch from Reinaldo de Souza Jr.
  1364. Changes in version - 2015-12-10
  1365. Tor version fixes a major bug in entry guard selection, as
  1366. well as a minor bug in hidden service reliability.
  1367. o Major bugfixes (guard selection):
  1368. - Actually look at the Guard flag when selecting a new directory
  1369. guard. When we implemented the directory guard design, we
  1370. accidentally started treating all relays as if they have the Guard
  1371. flag during guard selection, leading to weaker anonymity and worse
  1372. performance. Fixes bug 17772; bugfix on Discovered
  1373. by Mohsen Imani.
  1374. o Minor features (geoip):
  1375. - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
  1376. Country database.
  1377. o Minor bugfixes (compilation):
  1378. - When checking for net/pfvar.h, include netinet/in.h if possible.
  1379. This fixes transparent proxy detection on OpenBSD. Fixes bug
  1380. 17551; bugfix on Patch from "rubiate".
  1381. - Fix a compilation warning with Clang 3.6: Do not check the
  1382. presence of an address which can never be NULL. Fixes bug 17781.
  1383. o Minor bugfixes (correctness):
  1384. - When displaying an IPv6 exit policy, include the mask bits
  1385. correctly even when the number is greater than 31. Fixes bug
  1386. 16056; bugfix on Patch from "gturner".
  1387. - The wrong list was used when looking up expired intro points in a
  1388. rend service object, causing what we think could be reachability
  1389. issues for hidden services, and triggering a BUG log. Fixes bug
  1390. 16702; bugfix on
  1391. - Fix undefined behavior in the tor_cert_checksig function. Fixes
  1392. bug 17722; bugfix on
  1393. Changes in version - 2015-11-20
  1394. The Tor 0.2.7 release series is dedicated to the memory of Tor user
  1395. and privacy advocate Caspar Bowden (1961-2015). Caspar worked
  1396. tirelessly to advocate human rights regardless of national borders,
  1397. and oppose the encroachments of mass surveillance. He opposed national
  1398. exceptionalism, he brought clarity to legal and policy debates, he
  1399. understood and predicted the impact of mass surveillance on the world,
  1400. and he laid the groundwork for resisting it. While serving on the Tor
  1401. Project's board of directors, he brought us his uncompromising focus
  1402. on technical excellence in the service of humankind. Caspar was an
  1403. inimitable force for good and a wonderful friend. He was kind,
  1404. humorous, generous, gallant, and believed we should protect one
  1405. another without exception. We honor him here for his ideals, his
  1406. efforts, and his accomplishments. Please honor his memory with works
  1407. that would make him proud.
  1408. Tor is the first stable release in the Tor 0.2.7 series.
  1409. The 0.2.7 series adds a more secure identity key type for relays,
  1410. improves cryptography performance, resolves several longstanding
  1411. hidden-service performance issues, improves controller support for
  1412. hidden services, and includes small bugfixes and performance
  1413. improvements throughout the program. This release series also includes
  1414. more tests than before, and significant simplifications to which parts
  1415. of Tor invoke which others. For a full list of changes, see below.
  1416. o New system requirements:
  1417. - Tor no longer includes workarounds to support Libevent versions
  1418. before 1.3e. Libevent 2.0 or later is recommended. Closes
  1419. ticket 15248.
  1420. - Tor no longer supports copies of OpenSSL that are missing support
  1421. for Elliptic Curve Cryptography. (We began using ECC when
  1422. available in, for more safe and efficient key
  1423. negotiation.) In particular, support for at least one of P256 or
  1424. P224 is now required, with manual configuration needed if only
  1425. P224 is available. Resolves ticket 16140.
  1426. - Tor no longer supports versions of OpenSSL before 1.0. (If you are
  1427. on an operating system that has not upgraded to OpenSSL 1.0 or
  1428. later, and you compile Tor from source, you will need to install a
  1429. more recent OpenSSL to link Tor against.) These versions of
  1430. OpenSSL are still supported by the OpenSSL, but the numerous
  1431. cryptographic improvements in later OpenSSL releases makes them a
  1432. clear choice. Resolves ticket 16034.
  1433. o Major features (controller):
  1434. - Add the ADD_ONION and DEL_ONION commands that allow the creation
  1435. and management of hidden services via the controller. Closes
  1436. ticket 6411.
  1437. - New "GETINFO onions/current" and "GETINFO onions/detached"
  1438. commands to get information about hidden services created via the
  1439. controller. Part of ticket 6411.
  1440. - New HSFETCH command to launch a request for a hidden service
  1441. descriptor. Closes ticket 14847.
  1442. - New HSPOST command to upload a hidden service descriptor. Closes
  1443. ticket 3523. Patch by "DonnchaC".
  1444. o Major features (Ed25519 identity keys, Proposal 220):
  1445. - Add support for offline encrypted Ed25519 master keys. To use this
  1446. feature on your tor relay, run "tor --keygen" to make a new master
  1447. key (or to make a new signing key if you already have a master
  1448. key). Closes ticket 13642.
  1449. - All relays now maintain a stronger identity key, using the Ed25519
  1450. elliptic curve signature format. This master key is designed so
  1451. that it can be kept offline. Relays also generate an online
  1452. signing key, and a set of other Ed25519 keys and certificates.
  1453. These are all automatically regenerated and rotated as needed.
  1454. Implements part of ticket 12498.
  1455. - Directory authorities now vote on Ed25519 identity keys along with
  1456. RSA1024 keys. Implements part of ticket 12498.
  1457. - Directory authorities track which Ed25519 identity keys have been
  1458. used with which RSA1024 identity keys, and do not allow them to
  1459. vary freely. Implements part of ticket 12498.
  1460. - Microdescriptors now include Ed25519 identity keys. Implements
  1461. part of ticket 12498.
  1462. - Add a --newpass option to allow changing or removing the
  1463. passphrase of an encrypted key with tor --keygen. Implements part
  1464. of ticket 16769.
  1465. - Add a new OfflineMasterKey option to tell Tor never to try loading
  1466. or generating a secret Ed25519 identity key. You can use this in
  1467. combination with tor --keygen to manage offline and/or encrypted
  1468. Ed25519 keys. Implements ticket 16944.
  1469. - On receiving a HUP signal, check to see whether the Ed25519
  1470. signing key has changed, and reload it if so. Closes ticket 16790.
  1471. - Significant usability improvements for Ed25519 key management. Log
  1472. messages are better, and the code can recover from far more
  1473. failure conditions. Thanks to "s7r" for reporting and diagnosing
  1474. so many of these!
  1475. o Major features (ECC performance):
  1476. - Improve the runtime speed of Ed25519 signature verification by
  1477. using Ed25519-donna's batch verification support. Implements
  1478. ticket 16533.
  1479. - Improve the speed of Ed25519 operations and Curve25519 keypair
  1480. generation when built targeting 32 bit x86 platforms with SSE2
  1481. available. Implements ticket 16535.
  1482. - Improve the runtime speed of Ed25519 operations by using the
  1483. public-domain Ed25519-donna by Andrew M. ("floodyberry").
  1484. Implements ticket 16467.
  1485. - Improve the runtime speed of the ntor handshake by using an
  1486. optimized curve25519 basepoint scalarmult implementation from the
  1487. public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
  1488. ideas by Adam Langley. Implements ticket 9663.
  1489. o Major features (Hidden services):
  1490. - Hidden services, if using the EntryNodes option, are required to
  1491. use more than one EntryNode, in order to avoid a guard discovery
  1492. attack. (This would only affect people who had configured hidden
  1493. services and manually specified the EntryNodes option with a
  1494. single entry-node. The impact was that it would be easy to
  1495. remotely identify the guard node used by such a hidden service.
  1496. See ticket for more information.) Fixes ticket 14917.
  1497. - Add the torrc option HiddenServiceNumIntroductionPoints, to
  1498. specify a fixed number of introduction points. Its maximum value
  1499. is 10 and default is 3. Using this option can increase a hidden
  1500. service's reliability under load, at the cost of making it more
  1501. visible that the hidden service is facing extra load. Closes
  1502. ticket 4862.
  1503. - Remove the adaptive algorithm for choosing the number of
  1504. introduction points, which used to change the number of
  1505. introduction points (poorly) depending on the number of
  1506. connections the HS sees. Closes ticket 4862.
  1507. o Major features (onion key cross-certification):
  1508. - Relay descriptors now include signatures of their own identity
  1509. keys, made using the TAP and ntor onion keys. These signatures
  1510. allow relays to prove ownership of their own onion keys. Because
  1511. of this change, microdescriptors will no longer need to include
  1512. RSA identity keys. Implements proposal 228; closes ticket 12499.
  1513. o Major bugfixes (client-side privacy, also in
  1514. - Properly separate out each SOCKSPort when applying stream
  1515. isolation. The error occurred because each port's session group
  1516. was being overwritten by a default value when the listener
  1517. connection was initialized. Fixes bug 16247; bugfix on
  1518. Patch by "jojelino".
  1519. o Major bugfixes (hidden service clients, stability, also in
  1520. - Stop refusing to store updated hidden service descriptors on a
  1521. client. This reverts commit 9407040c59218 (which indeed fixed bug
  1522. 14219, but introduced a major hidden service reachability
  1523. regression detailed in bug 16381). This is a temporary fix since
  1524. we can live with the minor issue in bug 14219 (it just results in
  1525. some load on the network) but the regression of 16381 is too much
  1526. of a setback. First-round fix for bug 16381; bugfix
  1527. on
  1528. o Major bugfixes (hidden services):
  1529. - Revert commit that made directory authorities assign the HSDir
  1530. flag to relay without a DirPort; this was bad because such relays
  1531. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  1532. on
  1533. - When cannibalizing a circuit for an introduction point, always
  1534. extend to the chosen exit node (creating a 4 hop circuit).
  1535. Previously Tor would use the current circuit exit node, which
  1536. changed the original choice of introduction point, and could cause
  1537. the hidden service to skip excluded introduction points or
  1538. reconnect to a skipped introduction point. Fixes bug 16260; bugfix
  1539. on
  1540. o Major bugfixes (memory leaks):
  1541. - Fix a memory leak in ed25519 batch signature checking. Fixes bug
  1542. 17398; bugfix on
  1543. o Major bugfixes (open file limit):
  1544. - The open file limit wasn't checked before calling
  1545. tor_accept_socket_nonblocking(), which would make Tor exceed the
  1546. limit. Now, before opening a new socket, Tor validates the open
  1547. file limit just before, and if the max has been reached, return an
  1548. error. Fixes bug 16288; bugfix on
  1549. o Major bugfixes (security, correctness):
  1550. - Fix an error that could cause us to read 4 bytes before the
  1551. beginning of an openssl string. This bug could be used to cause
  1552. Tor to crash on systems with unusual malloc implementations, or
  1553. systems with unusual hardening installed. Fixes bug 17404; bugfix
  1554. on
  1555. o Major bugfixes (stability, also in
  1556. - Stop crashing with an assertion failure when parsing certain kinds
  1557. of malformed or truncated microdescriptors. Fixes bug 16400;
  1558. bugfix on Found by "torkeln"; fix based on a patch
  1559. by "cypherpunks_backup".
  1560. - Stop random client-side assertion failures that could occur when
  1561. connecting to a busy hidden service, or connecting to a hidden
  1562. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  1563. on
  1564. o Minor features (client, SOCKS):
  1565. - Add GroupWritable and WorldWritable options to unix-socket based
  1566. SocksPort and ControlPort options. These options apply to a single
  1567. socket, and override {Control,Socks}SocketsGroupWritable. Closes
  1568. ticket 15220.
  1569. - Relax the validation done to hostnames in SOCKS5 requests, and
  1570. allow a single trailing '.' to cope with clients that pass FQDNs
  1571. using that syntax to explicitly indicate that the domain name is
  1572. fully-qualified. Fixes bug 16674; bugfix on
  1573. - Relax the validation of hostnames in SOCKS5 requests, allowing the
  1574. character '_' to appear, in order to cope with domains observed in
  1575. the wild that are serving non-RFC compliant records. Resolves
  1576. ticket 16430.
  1577. o Minor features (client-side privacy):
  1578. - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
  1579. lifespan when IsolateSOCKSAuth and streams with SOCKS
  1580. authentication are attached to the circuit. This allows
  1581. applications like TorBrowser to manage circuit lifetime on their
  1582. own. Implements feature 15482.
  1583. - When logging malformed hostnames from SOCKS5 requests, respect
  1584. SafeLogging configuration. Fixes bug 16891; bugfix on
  1585. o Minor features (clock-jump tolerance):
  1586. - Recover better when our clock jumps back many hours, like might
  1587. happen for Tails or Whonix users who start with a very wrong
  1588. hardware clock, use Tor to discover a more accurate time, and then
  1589. fix their clock. Resolves part of ticket 8766.
  1590. o Minor features (command-line interface):
  1591. - Make --hash-password imply --hush to prevent unnecessary noise.
  1592. Closes ticket 15542. Patch from "cypherpunks".
  1593. - Print a warning whenever we find a relative file path being used
  1594. as torrc option. Resolves issue 14018.
  1595. o Minor features (compilation):
  1596. - Give a warning as early as possible when trying to build with an
  1597. unsupported OpenSSL version. Closes ticket 16901.
  1598. - Use C99 variadic macros when the compiler is not GCC. This avoids
  1599. failing compilations on MSVC, and fixes a log-file-based race
  1600. condition in our old workarounds. Original patch from Gisle Vanem.
  1601. o Minor features (control protocol):
  1602. - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
  1603. the control protocol. Resolves ticket 15358.
  1604. o Minor features (controller):
  1605. - Add DirAuthority lines for default directory authorities to the
  1606. output of the "GETINFO config/defaults" command if not already
  1607. present. Implements ticket 14840.
  1608. - Controllers can now use "GETINFO hs/client/desc/id/..." to
  1609. retrieve items from the client's hidden service descriptor cache.
  1610. Closes ticket 14845.
  1611. - Implement a new controller command "GETINFO status/fresh-relay-
  1612. descs" to fetch a descriptor/extrainfo pair that was generated on
  1613. demand just for the controller's use. Implements ticket 14784.
  1614. o Minor features (directory authorities):
  1615. - Directory authorities no longer vote against the "Fast", "Stable",
  1616. and "HSDir" flags just because they were going to vote against
  1617. "Running": if the consensus turns out to be that the router was
  1618. running, then the authority's vote should count. Patch from Peter
  1619. Retzlaff; closes issue 8712.
  1620. o Minor features (directory authorities, security, also in
  1621. - The HSDir flag given by authorities now requires the Stable flag.
  1622. For the current network, this results in going from 2887 to 2806
  1623. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  1624. attack by raising the effort for a relay to become Stable to
  1625. require at the very least 7 days, while maintaining the 96 hours
  1626. uptime requirement for HSDir. Implements ticket 8243.
  1627. o Minor features (DoS-resistance):
  1628. - Make it harder for attackers to overload hidden services with
  1629. introductions, by blocking multiple introduction requests on the
  1630. same circuit. Resolves ticket 15515.
  1631. o Minor features (geoip):
  1632. - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
  1633. Country database.
  1634. o Minor features (hidden services):
  1635. - Add the new options "HiddenServiceMaxStreams" and
  1636. "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
  1637. limit the maximum number of simultaneous streams per circuit, and
  1638. optionally tear down the circuit when the limit is exceeded. Part
  1639. of ticket 16052.
  1640. - Client now uses an introduction point failure cache to know when
  1641. to fetch or keep a descriptor in their cache. Previously, failures
  1642. were recorded implicitly, but not explicitly remembered. Closes
  1643. ticket 16389.
  1644. - Relays need to have the Fast flag to get the HSDir flag. As this
  1645. is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
  1646. drop. This change should make some attacks against the hidden
  1647. service directory system harder. Fixes ticket 15963.
  1648. - Turn on hidden service statistics collection by setting the torrc
  1649. option HiddenServiceStatistics to "1" by default. (This keeps
  1650. track only of the fraction of traffic used by hidden services, and
  1651. the total number of hidden services in existence.) Closes
  1652. ticket 15254.
  1653. - To avoid leaking HS popularity, don't cycle the introduction point
  1654. when we've handled a fixed number of INTRODUCE2 cells but instead
  1655. cycle it when a random number of introductions is reached, thus
  1656. making it more difficult for an attacker to find out the amount of
  1657. clients that have used the introduction point for a specific HS.
  1658. Closes ticket 15745.
  1659. o Minor features (logging):
  1660. - Include the Tor version in all LD_BUG log messages, since people
  1661. tend to cut and paste those into the bugtracker. Implements
  1662. ticket 15026.
  1663. o Minor features (pluggable transports):
  1664. - When launching managed pluggable transports on Linux systems,
  1665. attempt to have the kernel deliver a SIGTERM on tor exit if the
  1666. pluggable transport process is still running. Resolves
  1667. ticket 15471.
  1668. - When launching managed pluggable transports, setup a valid open
  1669. stdin in the child process that can be used to detect if tor has
  1670. terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
  1671. can be used by implementations to detect this new behavior.
  1672. Resolves ticket 15435.
  1673. o Minor bugfixes (torrc exit policies):
  1674. - In each instance above, usage advice is provided to avoid the
  1675. message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
  1676. 16069; bugfix on
  1677. - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
  1678. produce IPv6 wildcard addresses. Previously they would produce
  1679. both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
  1680. of bug 16069; bugfix on
  1681. - When parsing torrc ExitPolicies, we now issue an info-level
  1682. message when expanding an "accept/reject *" line to include both
  1683. IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
  1684. - When parsing torrc ExitPolicies, we now warn for a number of cases
  1685. where the user's intent is likely to differ from Tor's actual
  1686. behavior. These include: using an IPv4 address with an accept6 or
  1687. reject6 line; using "private" on an accept6 or reject6 line; and
  1688. including any ExitPolicy lines after accept *:* or reject *:*.
  1689. Related to ticket 16069.
  1690. o Minor bugfixes (command-line interface):
  1691. - When "--quiet" is provided along with "--validate-config", do not
  1692. write anything to stdout on success. Fixes bug 14994; bugfix
  1693. on
  1694. - When complaining about bad arguments to "--dump-config", use
  1695. stderr, not stdout.
  1696. - Print usage information for --dump-config when it is used without
  1697. an argument. Also, fix the error message to use different wording
  1698. and add newline at the end. Fixes bug 15541; bugfix
  1699. on
  1700. o Minor bugfixes (compilation):
  1701. - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
  1702. bugfix on Patch from 'jamestk'.
  1703. - Repair compilation with the most recent (unreleased, alpha)
  1704. vesions of OpenSSL 1.1. Fixes part of ticket 17237.
  1705. o Minor bugfixes (compilation, also in
  1706. - Build with --enable-systemd correctly when libsystemd is
  1707. installed, but systemd is not. Fixes bug 16164; bugfix on
  1708. Patch from Peter Palfrader.
  1709. o Minor bugfixes (configuration, unit tests):
  1710. - Only add the default fallback directories when the DirAuthorities,
  1711. AlternateDirAuthority, and FallbackDir directory config options
  1712. are set to their defaults. The default fallback directory list is
  1713. currently empty, this fix will only change tor's behavior when it
  1714. has default fallback directories. Includes unit tests for
  1715. consider_adding_dir_servers(). Fixes bug 15642; bugfix on
  1716. 90f6071d8dc0 in Patch by "teor".
  1717. o Minor bugfixes (controller):
  1718. - Add the descriptor ID in each HS_DESC control event. It was
  1719. missing, but specified in control-spec.txt. Fixes bug 15881;
  1720. bugfix on
  1721. o Minor bugfixes (correctness):
  1722. - For correctness, avoid modifying a constant string in
  1723. handle_control_postdescriptor. Fixes bug 15546; bugfix
  1724. on
  1725. - Remove side-effects from tor_assert() calls. This was harmless,
  1726. because we never disable assertions, but it is bad style and
  1727. unnecessary. Fixes bug 15211; bugfix on,,
  1728. and
  1729. - When calling channel_free_list(), avoid calling smartlist_remove()
  1730. while inside a FOREACH loop. This partially reverts commit
  1731. 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
  1732. incorrectly removed. Fixes bug 16924; bugfix on
  1733. o Minor bugfixes (crypto error-handling, also in
  1734. - Check for failures from crypto_early_init, and refuse to continue.
  1735. A previous typo meant that we could keep going with an
  1736. uninitialized crypto library, and would have OpenSSL initialize
  1737. its own PRNG. Fixes bug 16360; bugfix on, introduced
  1738. when implementing ticket 4900. Patch by "teor".
  1739. o Minor bugfixes (hidden service):
  1740. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  1741. a client authorized hidden service. Fixes bug 15823; bugfix
  1742. on
  1743. - Remove an extraneous newline character from the end of hidden
  1744. service descriptors. Fixes bug 15296; bugfix on
  1745. o Minor bugfixes (Linux seccomp2 sandbox):
  1746. - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
  1747. defined. Patch by "teor". Fixes bug 16515; bugfix on
  1748. - Allow bridge authorities to run correctly under the seccomp2
  1749. sandbox. Fixes bug 16964; bugfix on
  1750. - Add the "hidserv-stats" filename to our sandbox filter for the
  1751. HiddenServiceStatistics option to work properly. Fixes bug 17354;
  1752. bugfix on Patch from David Goulet.
  1753. o Minor bugfixes (Linux seccomp2 sandbox, also in
  1754. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  1755. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  1756. on Patch from "teor".
  1757. o Minor bugfixes (Linux seccomp2 sandbox, also in
  1758. - Allow systemd connections to work with the Linux seccomp2 sandbox
  1759. code. Fixes bug 16212; bugfix on Patch by
  1760. Peter Palfrader.
  1761. - Fix sandboxing to work when running as a relay, by allowing the
  1762. renaming of secret_id_key, and allowing the eventfd2 and futex
  1763. syscalls. Fixes bug 16244; bugfix on Patch by
  1764. Peter Palfrader.
  1765. o Minor bugfixes (logging):
  1766. - When building Tor under Clang, do not include an extra set of
  1767. parentheses in log messages that include function names. Fixes bug
  1768. 15269; bugfix on every released version of Tor when compiled with
  1769. recent enough Clang.
  1770. o Minor bugfixes (network):
  1771. - When attempting to use fallback technique for network interface
  1772. lookup, disregard loopback and multicast addresses since they are
  1773. unsuitable for public communications.
  1774. o Minor bugfixes (open file limit):
  1775. - Fix set_max_file_descriptors() to set by default the max open file
  1776. limit to the current limit when setrlimit() fails. Fixes bug
  1777. 16274; bugfix on tor- Patch by dgoulet.
  1778. o Minor bugfixes (portability):
  1779. - Check correctly for Windows socket errors in the workqueue
  1780. backend. Fixes bug 16741; bugfix on
  1781. - Try harder to normalize the exit status of the Tor process to the
  1782. standard-provided range. Fixes bug 16975; bugfix on every version
  1783. of Tor ever.
  1784. - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
  1785. of bug 17151; bugfix on Patch from Marcin Cieślak.
  1786. o Minor bugfixes (relay):
  1787. - Ensure that worker threads actually exit when a fatal error or
  1788. shutdown is indicated. This fix doesn't currently affect the
  1789. behavior of Tor, because Tor workers never indicates fatal error
  1790. or shutdown except in the unit tests. Fixes bug 16868; bugfix
  1791. on
  1792. - Fix a rarely-encountered memory leak when failing to initialize
  1793. the thread pool. Fixes bug 16631; bugfix on Patch
  1794. from "cypherpunks".
  1795. - Unblock threads before releasing the work queue mutex to ensure
  1796. predictable scheduling behavior. Fixes bug 16644; bugfix
  1797. on
  1798. o Minor bugfixes (security, exit policies):
  1799. - ExitPolicyRejectPrivate now also rejects the relay's published
  1800. IPv6 address (if any), and any publicly routable IPv4 or IPv6
  1801. addresses on any local interfaces. ticket 17027. Patch by "teor".
  1802. Fixes bug 17027; bugfix on
  1803. o Minor bugfixes (statistics):
  1804. - Disregard the ConnDirectionStatistics torrc options when Tor is
  1805. not a relay since in that mode of operation no sensible data is
  1806. being collected and because Tor might run into measurement hiccups
  1807. when running as a client for some time, then becoming a relay.
  1808. Fixes bug 15604; bugfix on
  1809. o Minor bugfixes (systemd):
  1810. - Tor's systemd unit file no longer contains extraneous spaces.
  1811. These spaces would sometimes confuse tools like deb-systemd-
  1812. helper. Fixes bug 16162; bugfix on
  1813. o Minor bugfixes (test networks):
  1814. - When self-testing reachability, use ExtendAllowPrivateAddresses to
  1815. determine if local/private addresses imply reachability. The
  1816. previous fix used TestingTorNetwork, which implies
  1817. ExtendAllowPrivateAddresses, but this excluded rare configurations
  1818. where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
  1819. not. Fixes bug 15771; bugfix on Patch by "teor",
  1820. issue discovered by CJ Ess.
  1821. o Minor bugfixes (tests, also in
  1822. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  1823. 16030; bugfix on Patch from "NewEraCracker".
  1824. o Code simplification and refactoring:
  1825. - Change the function that's called when we need to retry all
  1826. downloads so that it only reschedules the downloads to happen
  1827. immediately, rather than launching them all at once itself. This
  1828. further simplifies Tor's callgraph.
  1829. - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
  1830. to ensure they remain consistent and visible everywhere.
  1831. - Move some format-parsing functions out of crypto.c and
  1832. crypto_curve25519.c into crypto_format.c and/or util_format.c.
  1833. - Move the client-only parts of init_keys() into a separate
  1834. function. Closes ticket 16763.
  1835. - Move the hacky fallback code out of get_interface_address6() into
  1836. separate function and get it covered with unit-tests. Resolves
  1837. ticket 14710.
  1838. - Refactor hidden service client-side cache lookup to intelligently
  1839. report its various failure cases, and disentangle failure cases
  1840. involving a lack of introduction points. Closes ticket 14391.
  1841. - Remove some vestigial workarounds for the MSVC6 compiler. We
  1842. haven't supported that in ages.
  1843. - Remove the unused "nulterminate" argument from buf_pullup().
  1844. - Simplify the microdesc_free() implementation so that it no longer
  1845. appears (to code analysis tools) to potentially invoke a huge
  1846. suite of other microdesc functions.
  1847. - Simply the control graph further by deferring the inner body of
  1848. directory_all_unreachable() into a callback. Closes ticket 16762.
  1849. - The link authentication code has been refactored for better
  1850. testability and reliability. It now uses code generated with the
  1851. "trunnel" binary encoding generator, to reduce the risk of bugs
  1852. due to programmer error. Done as part of ticket 12498.
  1853. - Treat the loss of an owning controller as equivalent to a SIGTERM
  1854. signal. This removes a tiny amount of duplicated code, and
  1855. simplifies our callgraph. Closes ticket 16788.
  1856. - Use our own Base64 encoder instead of OpenSSL's, to allow more
  1857. control over the output. Part of ticket 15652.
  1858. - When generating an event to send to the controller, we no longer
  1859. put the event over the network immediately. Instead, we queue
  1860. these events, and use a Libevent callback to deliver them. This
  1861. change simplifies Tor's callgraph by reducing the number of
  1862. functions from which all other Tor functions are reachable. Closes
  1863. ticket 16695.
  1864. - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
  1865. that try to scan or compile every file on Unix won't decide that
  1866. they are broken.
  1867. o Documentation:
  1868. - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
  1869. - Improve the descriptions of statistics-related torrc options in
  1870. the manpage to describe rationale and possible uses cases. Fixes
  1871. issue 15550.
  1872. - Improve the layout and formatting of ./configure --help messages.
  1873. Closes ticket 15024. Patch from "cypherpunks".
  1874. - Include a specific and (hopefully) accurate documentation of the
  1875. torrc file's meta-format in doc/torrc_format.txt. This is mainly
  1876. of interest to people writing programs to parse or generate torrc
  1877. files. This document is not a commitment to long-term
  1878. compatibility; some aspects of the current format are a bit
  1879. ridiculous. Closes ticket 2325.
  1880. - Include the TUNING document in our source tarball. It is referred
  1881. to in the ChangeLog and an error message. Fixes bug 16929; bugfix
  1882. on
  1883. - Note that HiddenServicePorts can take a unix domain socket. Closes
  1884. ticket 17364.
  1885. - Recommend a 40 GB example AccountingMax in torrc.sample rather
  1886. than a 4 GB max. Closes ticket 16742.
  1887. - Standardize on the term "server descriptor" in the manual page.
  1888. Previously, we had used "router descriptor", "server descriptor",
  1889. and "relay descriptor" interchangeably. Part of ticket 14987.
  1890. - Advise users on how to configure separate IPv4 and IPv6 exit
  1891. policies in the manpage and sample torrcs. Related to ticket 16069.
  1892. - Fix an error in the manual page and comments for
  1893. TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
  1894. required "ORPort connectivity". While this is true, it is in no
  1895. way unique to the HSDir flag. Of all the flags, only HSDirs need a
  1896. DirPort configured in order for the authorities to assign that
  1897. particular flag. Patch by "teor". Fixed as part of 14882; bugfix
  1898. on
  1899. - Fix the usage message of tor-resolve(1) so that it no longer lists
  1900. the removed -F option. Fixes bug 16913; bugfix on
  1901. o Removed code:
  1902. - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
  1903. and always use the internal Base64 decoder. The internal decoder
  1904. has been part of tor since, and no one should
  1905. be using the OpenSSL one. Part of ticket 15652.
  1906. - Remove the 'tor_strclear()' function; use memwipe() instead.
  1907. Closes ticket 14922.
  1908. - Remove the code that would try to aggressively flush controller
  1909. connections while writing to them. This code was introduced in
  1910., in order to keep output buffers from exceeding
  1911. their limits. But there is no longer a maximum output buffer size,
  1912. and flushing data in this way caused some undesirable recursions
  1913. in our call graph. Closes ticket 16480.
  1914. - The internal pure-C tor-fw-helper tool is now removed from the Tor
  1915. distribution, in favor of the pure-Go clone available from
  1916. . The libraries
  1917. used by the C tor-fw-helper are not, in our opinion, very
  1918. confidence- inspiring in their secure-programming techniques.
  1919. Closes ticket 13338.
  1920. o Removed features:
  1921. - Remove the (seldom-used) DynamicDHGroups feature. For anti-
  1922. fingerprinting we now recommend pluggable transports; for forward-
  1923. secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
  1924. - Remove the HidServDirectoryV2 option. Now all relays offer to
  1925. store hidden service descriptors. Related to 16543.
  1926. - Remove the VoteOnHidServDirectoriesV2 option, since all
  1927. authorities have long set it to 1. Closes ticket 16543.
  1928. - Remove the undocumented "--digests" command-line option. It
  1929. complicated our build process, caused subtle build issues on
  1930. multiple platforms, and is now redundant since we started
  1931. including git version identifiers. Closes ticket 14742.
  1932. - Tor no longer contains checks for ancient directory cache versions
  1933. that didn't know about microdescriptors.
  1934. - Tor no longer contains workarounds for stat files generated by
  1935. super-old versions of Tor that didn't choose guards sensibly.
  1936. o Testing:
  1937. - The script now supports performance testing.
  1938. Requires corresponding chutney performance testing changes. Patch
  1939. by "teor". Closes ticket 14175.
  1940. - Add a new set of callgraph analysis scripts that use clang to
  1941. produce a list of which Tor functions are reachable from which
  1942. other Tor functions. We're planning to use these to help simplify
  1943. our code structure by identifying illogical dependencies.
  1944. - Add new 'test-full' and 'test-full-online' targets to run all
  1945. tests, including integration tests with stem and chutney.
  1946. - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
  1947. by-side in the same parent directory. Closes ticket 16903. Patch
  1948. by "teor".
  1949. - Document use of coverity, clang static analyzer, and clang dynamic
  1950. undefined behavior and address sanitizers in doc/HACKING. Include
  1951. detailed usage instructions in the blacklist. Patch by "teor".
  1952. Closes ticket 15817.
  1953. - Make "bridges+hs" the default test network. This tests almost all
  1954. tor functionality during make test-network, while allowing tests
  1955. to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
  1956. test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
  1957. (chutney). Patches by "teor".
  1958. - Make the test-workqueue test work on Windows by initializing the
  1959. network before we begin.
  1960. - New make target (make test-network-all) to run multiple applicable
  1961. chutney test cases. Patch from Teor; closes 16953.
  1962. - Now that OpenSSL has its own scrypt implementation, add an unit
  1963. test that checks for interoperability between libscrypt_scrypt()
  1964. and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
  1965. and rely on EVP_PBE_scrypt() whenever possible. Resolves
  1966. ticket 16189.
  1967. - The link authentication protocol code now has extensive tests.
  1968. - The relay descriptor signature testing code now has
  1969. extensive tests.
  1970. - The test_workqueue program now runs faster, and is enabled by
  1971. default as a part of "make check".
  1972. - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
  1973. functions in dns.c. Implements a portion of ticket 16831.
  1974. - Use environment variables rather than autoconf substitutions to
  1975. send variables from the build system to the test scripts. This
  1976. change should be easier to maintain, and cause 'make distcheck' to
  1977. work better than before. Fixes bug 17148.
  1978. - When building Tor with testing coverage enabled, run Chutney tests
  1979. (if any) using the 'tor-cov' coverage binary.
  1980. - When running test-network or test-stem, check for the absence of
  1981. stem/chutney before doing any build operations.
  1982. - Add a test to verify that the compiler does not eliminate our
  1983. memwipe() implementation. Closes ticket 15377.
  1984. - Add make rule `check-changes` to verify the format of changes
  1985. files. Closes ticket 15180.
  1986. - Add unit tests for control_event_is_interesting(). Add a compile-
  1987. time check that the number of events doesn't exceed the capacity
  1988. of control_event_t.event_mask. Closes ticket 15431, checks for
  1989. bugs similar to 13085. Patch by "teor".
  1990. - Command-line argument tests moved to Stem. Resolves ticket 14806.
  1991. - Integrate the ntor, backtrace, and zero-length keys tests into the
  1992. automake test suite. Closes ticket 15344.
  1993. - Remove assertions during builds to determine Tor's test coverage.
  1994. We don't want to trigger these even in assertions, so including
  1995. them artificially makes our branch coverage look worse than it is.
  1996. This patch provides the new test-stem-full and coverage-html-full
  1997. configure options. Implements ticket 15400.
  1998. - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
  1999. explicitly manage consensus flags in testing networks. Patch by
  2000. "robgjansen", modified by "teor". Implements part of ticket 14882.
  2001. - Check for matching value in server response in Fixes
  2002. bug 15591; bugfix on Reported and fixed
  2003. by "joelanders".
  2004. - Set the severity correctly when testing
  2005. get_interface_addresses_ifaddrs() and
  2006. get_interface_addresses_win32(), so that the tests fail gracefully
  2007. instead of triggering an assertion. Fixes bug 15759; bugfix on
  2008. Reported by Nicolas Derive.
  2009. Changes in version - 2015-07-12
  2010. Tor version fixes some significant stability and hidden
  2011. service client bugs, bulletproofs the cryptography init process, and
  2012. fixes a bug when using the sandbox code with some older versions of
  2013. Linux. Everyone running an older version, especially an older version
  2014. of 0.2.6, should upgrade.
  2015. o Major bugfixes (hidden service clients, stability):
  2016. - Stop refusing to store updated hidden service descriptors on a
  2017. client. This reverts commit 9407040c59218 (which indeed fixed bug
  2018. 14219, but introduced a major hidden service reachability
  2019. regression detailed in bug 16381). This is a temporary fix since
  2020. we can live with the minor issue in bug 14219 (it just results in
  2021. some load on the network) but the regression of 16381 is too much
  2022. of a setback. First-round fix for bug 16381; bugfix
  2023. on
  2024. o Major bugfixes (stability):
  2025. - Stop crashing with an assertion failure when parsing certain kinds
  2026. of malformed or truncated microdescriptors. Fixes bug 16400;
  2027. bugfix on Found by "torkeln"; fix based on a patch
  2028. by "cypherpunks_backup".
  2029. - Stop random client-side assertion failures that could occur when
  2030. connecting to a busy hidden service, or connecting to a hidden
  2031. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  2032. on
  2033. o Minor features (geoip):
  2034. - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
  2035. - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
  2036. o Minor bugfixes (crypto error-handling):
  2037. - Check for failures from crypto_early_init, and refuse to continue.
  2038. A previous typo meant that we could keep going with an
  2039. uninitialized crypto library, and would have OpenSSL initialize
  2040. its own PRNG. Fixes bug 16360; bugfix on, introduced
  2041. when implementing ticket 4900. Patch by "teor".
  2042. o Minor bugfixes (Linux seccomp2 sandbox):
  2043. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  2044. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  2045. on Patch from "teor".
  2046. Changes in version - 2015-06-11
  2047. Tor fixes a regression in the circuit isolation code, increases the
  2048. requirements for receiving an HSDir flag, and addresses some other small
  2049. bugs in the systemd and sandbox code. Clients using circuit isolation
  2050. should upgrade; all directory authorities should upgrade.
  2051. o Major bugfixes (client-side privacy):
  2052. - Properly separate out each SOCKSPort when applying stream
  2053. isolation. The error occurred because each port's session group was
  2054. being overwritten by a default value when the listener connection
  2055. was initialized. Fixes bug 16247; bugfix on Patch
  2056. by "jojelino".
  2057. o Minor feature (directory authorities, security):
  2058. - The HSDir flag given by authorities now requires the Stable flag.
  2059. For the current network, this results in going from 2887 to 2806
  2060. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  2061. attack by raising the effort for a relay to become Stable which
  2062. takes at the very least 7 days to do so and by keeping the 96
  2063. hours uptime requirement for HSDir. Implements ticket 8243.
  2064. o Minor bugfixes (compilation):
  2065. - Build with --enable-systemd correctly when libsystemd is
  2066. installed, but systemd is not. Fixes bug 16164; bugfix on
  2067. Patch from Peter Palfrader.
  2068. o Minor bugfixes (Linux seccomp2 sandbox):
  2069. - Fix sandboxing to work when running as a relaymby renaming of
  2070. secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
  2071. bug 16244; bugfix on Patch by Peter Palfrader.
  2072. - Allow systemd connections to work with the Linux seccomp2 sandbox
  2073. code. Fixes bug 16212; bugfix on Patch by
  2074. Peter Palfrader.
  2075. o Minor bugfixes (tests):
  2076. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  2077. 16030; bugfix on Patch from "NewEraCracker".
  2078. Changes in version - 2015-05-21
  2079. Tor fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
  2080. fixes an authority-side bug in assigning the HSDir flag. All directory
  2081. authorities should upgrade.
  2082. o Major bugfixes (hidden services, backport from
  2083. - Revert commit that made directory authorities assign the HSDir
  2084. flag to relay without a DirPort; this was bad because such relays
  2085. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  2086. on
  2087. o Minor bugfixes (hidden service, backport from
  2088. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  2089. a client authorized hidden service. Fixes bug 15823; bugfix
  2090. on
  2091. o Minor features (geoip):
  2092. - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
  2093. - Update geoip6 to the April 8 2015 Maxmind GeoLite2
  2094. Country database.
  2095. Changes in version - 2015-04-06
  2096. Tor fixes two security issues that could be used by an
  2097. attacker to crash hidden services, or crash clients visiting hidden
  2098. services. Hidden services should upgrade as soon as possible; clients
  2099. should upgrade whenever packages become available.
  2100. This release also contains two simple improvements to make hidden
  2101. services a bit less vulnerable to denial-of-service attacks.
  2102. o Major bugfixes (security, hidden service):
  2103. - Fix an issue that would allow a malicious client to trigger an
  2104. assertion failure and halt a hidden service. Fixes bug 15600;
  2105. bugfix on Reported by "disgleirio".
  2106. - Fix a bug that could cause a client to crash with an assertion
  2107. failure when parsing a malformed hidden service descriptor. Fixes
  2108. bug 15601; bugfix on Found by "DonnchaC".
  2109. o Minor features (DoS-resistance, hidden service):
  2110. - Introduction points no longer allow multiple INTRODUCE1 cells to
  2111. arrive on the same circuit. This should make it more expensive for
  2112. attackers to overwhelm hidden services with introductions.
  2113. Resolves ticket 15515.
  2114. - Decrease the amount of reattempts that a hidden service performs
  2115. when its rendezvous circuits fail. This reduces the computational
  2116. cost for running a hidden service under heavy load. Resolves
  2117. ticket 11447.
  2118. Changes in version - 2015-04-06
  2119. Tor backports two fixes from for security issues that
  2120. could be used by an attacker to crash hidden services, or crash clients
  2121. visiting hidden services. Hidden services should upgrade as soon as
  2122. possible; clients should upgrade whenever packages become available.
  2123. This release also backports a simple improvement to make hidden
  2124. services a bit less vulnerable to denial-of-service attacks.
  2125. o Major bugfixes (security, hidden service):
  2126. - Fix an issue that would allow a malicious client to trigger an
  2127. assertion failure and halt a hidden service. Fixes bug 15600;
  2128. bugfix on Reported by "disgleirio".
  2129. - Fix a bug that could cause a client to crash with an assertion
  2130. failure when parsing a malformed hidden service descriptor. Fixes
  2131. bug 15601; bugfix on Found by "DonnchaC".
  2132. o Minor features (DoS-resistance, hidden service):
  2133. - Introduction points no longer allow multiple INTRODUCE1 cells to
  2134. arrive on the same circuit. This should make it more expensive for
  2135. attackers to overwhelm hidden services with introductions.
  2136. Resolves ticket 15515.
  2137. Changes in version - 2015-04-06
  2138. Tor backports two fixes from for security issues that
  2139. could be used by an attacker to crash hidden services, or crash clients
  2140. visiting hidden services. Hidden services should upgrade as soon as
  2141. possible; clients should upgrade whenever packages become available.
  2142. This release also backports a simple improvement to make hidden
  2143. services a bit less vulnerable to denial-of-service attacks.
  2144. o Major bugfixes (security, hidden service):
  2145. - Fix an issue that would allow a malicious client to trigger an
  2146. assertion failure and halt a hidden service. Fixes bug 15600;
  2147. bugfix on Reported by "disgleirio".
  2148. - Fix a bug that could cause a client to crash with an assertion
  2149. failure when parsing a malformed hidden service descriptor. Fixes
  2150. bug 15601; bugfix on Found by "DonnchaC".
  2151. o Minor features (DoS-resistance, hidden service):
  2152. - Introduction points no longer allow multiple INTRODUCE1 cells to
  2153. arrive on the same circuit. This should make it more expensive for
  2154. attackers to overwhelm hidden services with introductions.
  2155. Resolves ticket 15515.
  2156. Changes in version - 2015-03-24
  2157. Tor is the first stable release in the 0.2.6 series.
  2158. It adds numerous safety, security, correctness, and performance
  2159. improvements. Client programs can be configured to use more kinds of
  2160. sockets, AutomapHosts works better, the multithreading backend is
  2161. improved, cell transmission is refactored, test coverage is much
  2162. higher, more denial-of-service attacks are handled, guard selection is
  2163. improved to handle long-term guards better, pluggable transports
  2164. should work a bit better, and some annoying hidden service performance
  2165. bugs should be addressed.
  2166. o New compiler and system requirements:
  2167. - Tor 0.2.6.x requires that your compiler support more of the C99
  2168. language standard than before. The 'configure' script now detects
  2169. whether your compiler supports C99 mid-block declarations and
  2170. designated initializers. If it does not, Tor will not compile.
  2171. We may revisit this requirement if it turns out that a significant
  2172. number of people need to build Tor with compilers that don't
  2173. bother implementing a 15-year-old standard. Closes ticket 13233.
  2174. - Tor no longer supports systems without threading support. When we
  2175. began working on Tor, there were several systems that didn't have
  2176. threads, or where the thread support wasn't able to run the
  2177. threads of a single process on multiple CPUs. That no longer
  2178. holds: every system where Tor needs to run well now has threading
  2179. support. Resolves ticket 12439.
  2180. o Deprecated versions and removed support:
  2181. - Tor relays older than are no longer allowed to
  2182. advertise themselves on the network. Closes ticket 13555.
  2183. - Tor clients no longer support connecting to hidden services
  2184. running on Tor 0.2.2.x and earlier; the Support022HiddenServices
  2185. option has been removed. (There shouldn't be any hidden services
  2186. running these versions on the network.) Closes ticket 7803.
  2187. o Directory authority changes:
  2188. - The directory authority Faravahar has a new IP address. This
  2189. closes ticket 14487.
  2190. - Remove turtles as a directory authority.
  2191. - Add longclaw as a new (v3) directory authority. This implements
  2192. ticket 13296. This keeps the directory authority count at 9.
  2193. o Major features (bridges):
  2194. - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
  2195. transports if they are configured via the "TOR_PT_PROXY"
  2196. environment variable. Implements proposal 232. Resolves
  2197. ticket 8402.
  2198. o Major features (changed defaults):
  2199. - Prevent relay operators from unintentionally running exits: When a
  2200. relay is configured as an exit node, we now warn the user unless
  2201. the "ExitRelay" option is set to 1. We warn even more loudly if
  2202. the relay is configured with the default exit policy, since this
  2203. can indicate accidental misconfiguration. Setting "ExitRelay 0"
  2204. stops Tor from running as an exit relay. Closes ticket 10067.
  2205. o Major features (client performance, hidden services):
  2206. - Allow clients to use optimistic data when connecting to a hidden
  2207. service, which should remove a round-trip from hidden service
  2208. initialization. See proposal 181 for details. Implements
  2209. ticket 13211.
  2210. o Major features (directory system):
  2211. - Upon receiving an unparseable directory object, if its digest
  2212. matches what we expected, then don't try to download it again.
  2213. Previously, when we got a descriptor we didn't like, we would keep
  2214. trying to download it over and over. Closes ticket 11243.
  2215. - When downloading server- or microdescriptors from a directory
  2216. server, we no longer launch multiple simultaneous requests to the
  2217. same server. This reduces load on the directory servers,
  2218. especially when directory guards are in use. Closes ticket 9969.
  2219. - When downloading server- or microdescriptors over a tunneled
  2220. connection, do not limit the length of our requests to what the
  2221. Squid proxy is willing to handle. Part of ticket 9969.
  2222. - Authorities can now vote on the correct digests and latest
  2223. versions for different software packages. This allows packages
  2224. that include Tor to use the Tor authority system as a way to get
  2225. notified of updates and their correct digests. Implements proposal
  2226. 227. Closes ticket 10395.
  2227. o Major features (guards):
  2228. - Introduce the Guardfraction feature to improves load balancing on
  2229. guard nodes. Specifically, it aims to reduce the traffic gap that
  2230. guard nodes experience when they first get the Guard flag. This is
  2231. a required step if we want to increase the guard lifetime to 9
  2232. months or greater. Closes ticket 9321.
  2233. o Major features (hidden services):
  2234. - Make HS port scanning more difficult by immediately closing the
  2235. circuit when a user attempts to connect to a nonexistent port.
  2236. Closes ticket 13667.
  2237. - Add a HiddenServiceStatistics option that allows Tor relays to
  2238. gather and publish statistics about the overall size and volume of
  2239. hidden service usage. Specifically, when this option is turned on,
  2240. an HSDir will publish an approximate number of hidden services
  2241. that have published descriptors to it the past 24 hours. Also, if
  2242. a relay has acted as a hidden service rendezvous point, it will
  2243. publish the approximate amount of rendezvous cells it has relayed
  2244. the past 24 hours. The statistics themselves are obfuscated so
  2245. that the exact values cannot be derived. For more details see
  2246. proposal 238, "Better hidden service stats from Tor relays". This
  2247. feature is currently disabled by default. Implements feature 13192.
  2248. o Major features (performance):
  2249. - Make the CPU worker implementation more efficient by avoiding the
  2250. kernel and lengthening pipelines. The original implementation used
  2251. sockets to transfer data from the main thread to the workers, and
  2252. didn't allow any thread to be assigned more than a single piece of
  2253. work at once. The new implementation avoids communications
  2254. overhead by making requests in shared memory, avoiding kernel IO
  2255. where possible, and keeping more requests in flight at once.
  2256. Implements ticket 9682.
  2257. o Major features (relay):
  2258. - Raise the minimum acceptable configured bandwidth rate for bridges
  2259. to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
  2260. 20 KiB/sec.) Closes ticket 13822.
  2261. - Complete revision of the code that relays use to decide which cell
  2262. to send next. Formerly, we selected the best circuit to write on
  2263. each channel, but we didn't select among channels in any
  2264. sophisticated way. Now, we choose the best circuits globally from
  2265. among those whose channels are ready to deliver traffic.
  2266. This patch implements a new inter-cmux comparison API, a global
  2267. high/low watermark mechanism and a global scheduler loop for
  2268. transmission prioritization across all channels as well as among
  2269. circuits on one channel. This schedule is currently tuned to
  2270. (tolerantly) avoid making changes in network performance, but it
  2271. should form the basis for major circuit performance increases in
  2272. the future. Code by Andrea; tuning by Rob Jansen; implements
  2273. ticket 9262.
  2274. o Major features (sample torrc):
  2275. - Add a new, infrequently-changed "torrc.minimal". This file is
  2276. similar to torrc.sample, but it will change as infrequently as
  2277. possible, for the benefit of users whose systems prompt them for
  2278. intervention whenever a default configuration file is changed.
  2279. Making this change allows us to update torrc.sample to be a more
  2280. generally useful "sample torrc".
  2281. o Major features (security, unix domain sockets):
  2282. - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
  2283. applications can reach Tor without having to create AF_INET or
  2284. AF_INET6 sockets, meaning they can completely disable their
  2285. ability to make non-Tor network connections. To create a socket of
  2286. this type, use "SocksPort unix:/path/to/socket". Implements
  2287. ticket 12585.
  2288. - Support mapping hidden service virtual ports to AF_UNIX sockets.
  2289. The syntax is "HiddenServicePort 80 unix:/path/to/socket".
  2290. Implements ticket 11485.
  2291. o Major bugfixes (client, automap):
  2292. - Repair automapping with IPv6 addresses. This automapping should
  2293. have worked previously, but one piece of debugging code that we
  2294. inserted to detect a regression actually caused the regression to
  2295. manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
  2296. Diagnosed and fixed by Francisco Blas
  2297. Izquierdo Riera.
  2298. o Major bugfixes (crash, OSX, security):
  2299. - Fix a remote denial-of-service opportunity caused by a bug in
  2300. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  2301. in OSX 10.9.
  2302. o Major bugfixes (directory authorities):
  2303. - Do not assign the HSDir flag to relays if they are not Valid, or
  2304. currently hibernating. Fixes 12573; bugfix on
  2305. o Major bugfixes (directory bandwidth performance):
  2306. - Don't flush the zlib buffer aggressively when compressing
  2307. directory information for clients. This should save about 7% of
  2308. the bandwidth currently used for compressed descriptors and
  2309. microdescriptors. Fixes bug 11787; bugfix on
  2310. o Major bugfixes (exit node stability):
  2311. - Fix an assertion failure that could occur under high DNS load.
  2312. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  2313. diagnosed and fixed by "cypherpunks".
  2314. o Major bugfixes (FreeBSD IPFW transparent proxy):
  2315. - Fix address detection with FreeBSD transparent proxies, when
  2316. "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
  2317. on
  2318. o Major bugfixes (hidden services):
  2319. - When closing an introduction circuit that was opened in parallel
  2320. with others, don't mark the introduction point as unreachable.
  2321. Previously, the first successful connection to an introduction
  2322. point would make the other introduction points get marked as
  2323. having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
  2324. o Major bugfixes (Linux seccomp2 sandbox):
  2325. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  2326. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  2327. Patch from "sanic".
  2328. o Major bugfixes (mixed relay-client operation):
  2329. - When running as a relay and client at the same time (not
  2330. recommended), if we decide not to use a new guard because we want
  2331. to retry older guards, only close the locally-originating circuits
  2332. passing through that guard. Previously we would close all the
  2333. circuits through that guard. Fixes bug 9819; bugfix on
  2334. Reported by "skruffy".
  2335. o Major bugfixes (pluggable transports):
  2336. - Initialize the extended OR Port authentication cookie before
  2337. launching pluggable transports. This prevents a race condition
  2338. that occured when server-side pluggable transports would cache the
  2339. authentication cookie before it has been (re)generated. Fixes bug
  2340. 15240; bugfix on
  2341. o Major bugfixes (relay, stability, possible security):
  2342. - Fix a bug that could lead to a relay crashing with an assertion
  2343. failure if a buffer of exactly the wrong layout is passed to
  2344. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  2345. Patch from "cypherpunks".
  2346. - Do not assert if the 'data' pointer on a buffer is advanced to the
  2347. very end of the buffer; log a BUG message instead. Only assert if
  2348. it is past that point. Fixes bug 15083; bugfix on
  2349. o Minor features (build):
  2350. - New --disable-system-torrc compile-time option to prevent Tor from
  2351. looking for the system-wide torrc or torrc-defaults files.
  2352. Resolves ticket 13037.
  2353. o Minor features (client):
  2354. - Clients are now willing to send optimistic data (before they
  2355. receive a 'connected' cell) to relays of any version. (Relays
  2356. without support for optimistic data are no longer supported on the
  2357. Tor network.) Resolves ticket 13153.
  2358. o Minor features (client):
  2359. - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
  2360. is enabled, reject requests with IP addresses as hostnames.
  2361. Resolves ticket 13315.
  2362. o Minor features (controller):
  2363. - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
  2364. write an unscheduled heartbeat message to the log. Implements
  2365. feature 9503.
  2366. - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
  2367. events so controllers can observe circuit isolation inputs. Closes
  2368. ticket 8405.
  2369. - ControlPort now supports the unix:/path/to/socket syntax as an
  2370. alternative to the ControlSocket option, for consistency with
  2371. SocksPort and HiddenServicePort. Closes ticket 14451.
  2372. - New "GETINFO bw-event-cache" to get information about recent
  2373. bandwidth events. Closes ticket 14128. Useful for controllers to
  2374. get recent bandwidth history after the fix for ticket 13988.
  2375. - Messages about problems in the bootstrap process now include
  2376. information about the server we were trying to connect to when we
  2377. noticed the problem. Closes ticket 15006.
  2378. o Minor features (Denial of service resistance):
  2379. - Count the total number of bytes used storing hidden service
  2380. descriptors against the value of MaxMemInQueues. If we're low on
  2381. memory, and more than 20% of our memory is used holding hidden
  2382. service descriptors, free them until no more than 10% of our
  2383. memory holds hidden service descriptors. Free the least recently
  2384. fetched descriptors first. Resolves ticket 13806.
  2385. - When we have recently been under memory pressure (over 3/4 of
  2386. MaxMemInQueues is allocated), then allocate smaller zlib objects
  2387. for small requests. Closes ticket 11791.
  2388. o Minor features (directory authorities):
  2389. - Don't list relays with a bandwidth estimate of 0 in the consensus.
  2390. Implements a feature proposed during discussion of bug 13000.
  2391. - In tor-gencert, report an error if the user provides the same
  2392. argument more than once.
  2393. - If a directory authority can't find a best consensus method in the
  2394. votes that it holds, it now falls back to its favorite consensus
  2395. method. Previously, it fell back to method 1. Neither of these is
  2396. likely to get enough signatures, but "fall back to favorite"
  2397. doesn't require us to maintain support an obsolete consensus
  2398. method. Implements part of proposal 215.
  2399. o Minor features (geoip):
  2400. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  2401. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  2402. Country database.
  2403. o Minor features (guard nodes):
  2404. - Reduce the time delay before saving guard status to disk from 10
  2405. minutes to 30 seconds (or from one hour to 10 minutes if
  2406. AvoidDiskWrites is set). Closes ticket 12485.
  2407. o Minor features (heartbeat):
  2408. - On relays, report how many connections we negotiated using each
  2409. version of the Tor link protocols. This information will let us
  2410. know if removing support for very old versions of the Tor
  2411. protocols is harming the network. Closes ticket 15212.
  2412. o Minor features (hidden service):
  2413. - Make Sybil attacks against hidden services harder by changing the
  2414. minimum time required to get the HSDir flag from 25 hours up to 96
  2415. hours. Addresses ticket 14149.
  2416. - New option "HiddenServiceAllowUnknownPorts" to allow hidden
  2417. services to disable the anti-scanning feature introduced in
  2418. With this option not set, a connection to an
  2419. unlisted port closes the circuit. With this option set, only a
  2420. RELAY_DONE cell is sent. Closes ticket 14084.
  2421. - When re-enabling the network, don't try to build introduction
  2422. circuits until we have successfully built a circuit. This makes
  2423. hidden services come up faster when the network is re-enabled.
  2424. Patch from "akwizgran". Closes ticket 13447.
  2425. - When we fail to retrieve a hidden service descriptor, send the
  2426. controller an "HS_DESC FAILED" controller event. Implements
  2427. feature 13212.
  2428. - New HiddenServiceDirGroupReadable option to cause hidden service
  2429. directories and hostname files to be created group-readable. Patch
  2430. from "anon", David Stainton, and "meejah". Closes ticket 11291.
  2431. o Minor features (interface):
  2432. - Implement "-f -" command-line option to read torrc configuration
  2433. from standard input, if you don't want to store the torrc file in
  2434. the file system. Implements feature 13865.
  2435. o Minor features (logging):
  2436. - Add a count of unique clients to the bridge heartbeat message.
  2437. Resolves ticket 6852.
  2438. - Suppress "router info incompatible with extra info" message when
  2439. reading extrainfo documents from cache. (This message got loud
  2440. around when we closed bug 9812 in Closes
  2441. ticket 13762.
  2442. - Elevate hidden service authorized-client message from DEBUG to
  2443. INFO. Closes ticket 14015.
  2444. - On Unix-like systems, you can now use named pipes as the target of
  2445. the Log option, and other options that try to append to files.
  2446. Closes ticket 12061. Patch from "carlo von lynX".
  2447. - When opening a log file at startup, send it every log message that
  2448. we generated between startup and opening it. Previously, log
  2449. messages that were generated before opening the log file were only
  2450. logged to stdout. Closes ticket 6938.
  2451. - Add a TruncateLogFile option to overwrite logs instead of
  2452. appending to them. Closes ticket 5583.
  2453. - Quiet some log messages in the heartbeat and at startup. Closes
  2454. ticket 14950.
  2455. o Minor features (portability, Solaris):
  2456. - Threads are no longer disabled by default on Solaris; we believe
  2457. that the versions of Solaris with broken threading support are all
  2458. obsolete by now. Resolves ticket 9495.
  2459. o Minor features (relay):
  2460. - Re-check our address after we detect a changed IP address from
  2461. getsockname(). This ensures that the controller command "GETINFO
  2462. address" will report the correct value. Resolves ticket 11582.
  2463. Patch from "ra".
  2464. - A new AccountingRule option lets Relays set whether they'd like
  2465. AccountingMax to be applied separately to inbound and outbound
  2466. traffic, or applied to the sum of inbound and outbound traffic.
  2467. Resolves ticket 961. Patch by "chobe".
  2468. - When identity keypair is generated for first time, log a
  2469. congratulatory message that links to the new relay lifecycle
  2470. document. Implements feature 10427.
  2471. o Minor features (security, memory wiping):
  2472. - Ensure we securely wipe keys from memory after
  2473. crypto_digest_get_digest and init_curve25519_keypair_from_file
  2474. have finished using them. Resolves ticket 13477.
  2475. o Minor features (security, out-of-memory handling):
  2476. - When handling an out-of-memory condition, allocate less memory for
  2477. temporary data structures. Fixes issue 10115.
  2478. - When handling an out-of-memory condition, consider more types of
  2479. buffers, including those on directory connections, and zlib
  2480. buffers. Resolves ticket 11792.
  2481. o Minor features (stability):
  2482. - Add assertions in our hash-table iteration code to check for
  2483. corrupted values that could cause infinite loops. Closes
  2484. ticket 11737.
  2485. o Minor features (systemd):
  2486. - Various improvements and modernizations in systemd hardening
  2487. support. Closes ticket 13805. Patch from Craig Andrews.
  2488. - Where supported, when running with systemd, report successful
  2489. startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
  2490. - When running with systemd, support systemd watchdog messages. Part
  2491. of ticket 11016. Patch by Michael Scherer.
  2492. o Minor features (testing networks):
  2493. - Add the TestingDirAuthVoteExit option, which lists nodes to assign
  2494. the "Exit" flag regardless of their uptime, bandwidth, or exit
  2495. policy. TestingTorNetwork must be set for this option to have any
  2496. effect. Previously, authorities would take up to 35 minutes to
  2497. give nodes the Exit flag in a test network. Partially implements
  2498. ticket 13161.
  2499. - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
  2500. and the default on a testing network to 2 minutes. Drop the
  2501. MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
  2502. keep the default on a testing network at 30 seconds. This reduces
  2503. HS bootstrap time to around 25 seconds. Also, change the default
  2504. time in to match. Closes ticket 13401. Patch
  2505. by "teor".
  2506. - Create TestingDirAuthVoteHSDir to correspond to
  2507. TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
  2508. HSDir flag for the listed relays regardless of uptime or ORPort
  2509. connectivity. Respects the value of VoteOnHidServDirectoriesV2.
  2510. Partial implementation for ticket 14067. Patch by "teor".
  2511. o Minor features (tor2web mode):
  2512. - Introduce the config option Tor2webRendezvousPoints, which allows
  2513. clients in Tor2webMode to select a specific Rendezvous Point to be
  2514. used in HS circuits. This might allow better performance for
  2515. Tor2Web nodes. Implements ticket 12844.
  2516. o Minor features (transparent proxy):
  2517. - Update the transparent proxy option checks to allow for both ipfw
  2518. and pf on OS X. Closes ticket 14002.
  2519. - Use the correct option when using IPv6 with transparent proxy
  2520. support on Linux. Resolves 13808. Patch by Francisco Blas
  2521. Izquierdo Riera.
  2522. o Minor features (validation):
  2523. - Check all date/time values passed to tor_timegm and
  2524. parse_rfc1123_time for validity, taking leap years into account.
  2525. Improves HTTP header validation. Implemented with bug 13476.
  2526. - In correct_tm(), limit the range of values returned by system
  2527. localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
  2528. This means we don't have to deal with negative or too large dates,
  2529. even if a clock is wrong. Otherwise we might fail to read a file
  2530. written by us which includes such a date. Fixes bug 13476.
  2531. - Stop allowing invalid address patterns like "*/24" that contain
  2532. both a wildcard address and a bit prefix length. This affects all
  2533. our address-range parsing code. Fixes bug 7484; bugfix
  2534. on 0.0.2pre14.
  2535. o Minor bugfixes (bridge clients):
  2536. - When configured to use a bridge without an identity digest (not
  2537. recommended), avoid launching an extra channel to it when
  2538. bootstrapping. Fixes bug 7733; bugfix on
  2539. o Minor bugfixes (bridges):
  2540. - When DisableNetwork is set, do not launch pluggable transport
  2541. plugins, and if any are running, terminate them. Fixes bug 13213;
  2542. bugfix on
  2543. o Minor bugfixes (C correctness):
  2544. - Fix several instances of possible integer overflow/underflow/NaN.
  2545. Fixes bug 13104; bugfix on and later. Patches
  2546. from "teor".
  2547. - In circuit_build_times_calculate_timeout() in circuitstats.c,
  2548. avoid dividing by zero in the pareto calculations. This traps
  2549. under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
  2550. on
  2551. - Fix an integer overflow in format_time_interval(). Fixes bug
  2552. 13393; bugfix on
  2553. - Set the correct day of year value when the system's localtime(_r)
  2554. or gmtime(_r) functions fail to set struct tm. Not externally
  2555. visible. Fixes bug 13476; bugfix on 0.0.2pre14.
  2556. - Avoid unlikely signed integer overflow in tor_timegm on systems
  2557. with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
  2558. o Minor bugfixes (certificate handling):
  2559. - If an authority operator accidentally makes a signing certificate
  2560. with a future publication time, do not discard its real signing
  2561. certificates. Fixes bug 11457; bugfix on
  2562. - Remove any old authority certificates that have been superseded
  2563. for at least two days. Previously, we would keep superseded
  2564. certificates until they expired, if they were published close in
  2565. time to the certificate that superseded them. Fixes bug 11454;
  2566. bugfix on
  2567. o Minor bugfixes (client):
  2568. - Fix smartlist_choose_node_by_bandwidth() so that relays with the
  2569. BadExit flag are not considered worthy candidates. Fixes bug
  2570. 13066; bugfix on
  2571. - Use the consensus schedule for downloading consensuses, and not
  2572. the generic schedule. Fixes bug 11679; bugfix on
  2573. - Handle unsupported or malformed SOCKS5 requests properly by
  2574. responding with the appropriate error message before closing the
  2575. connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
  2576. o Minor bugfixes (client, automapping):
  2577. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  2578. no value follows the option. Fixes bug 14142; bugfix on
  2579. Patch by "teor".
  2580. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  2581. 14195; bugfix on
  2582. - Prevent changes to other options from removing the wildcard value
  2583. "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
  2584. on
  2585. - Allow MapAddress and AutomapHostsOnResolve to work together when
  2586. an address is mapped into another address type (like .onion) that
  2587. must be automapped at resolve time. Fixes bug 7555; bugfix
  2588. on
  2589. o Minor bugfixes (client, bridges):
  2590. - When we are using bridges and we had a network connectivity
  2591. problem, only retry connecting to our currently configured
  2592. bridges, not all bridges we know about and remember using. Fixes
  2593. bug 14216; bugfix on
  2594. o Minor bugfixes (client, DNS):
  2595. - Report the correct cached DNS expiration times on SOCKS port or in
  2596. DNS replies. Previously, we would report everything as "never
  2597. expires." Fixes bug 14193; bugfix on
  2598. - Avoid a small memory leak when we find a cached answer for a
  2599. reverse DNS lookup in a client-side DNS cache. (Remember, client-
  2600. side DNS caching is off by default, and is not recommended.) Fixes
  2601. bug 14259; bugfix on
  2602. o Minor bugfixes (client, IPv6):
  2603. - Reject socks requests to literal IPv6 addresses when IPv6Traffic
  2604. flag is not set; and not because the NoIPv4Traffic flag was set.
  2605. Previously we'd looked at the NoIPv4Traffic flag for both types of
  2606. literal addresses. Fixes bug 14280; bugfix on
  2607. o Minor bugfixes (client, microdescriptors):
  2608. - Use a full 256 bits of the SHA256 digest of a microdescriptor when
  2609. computing which microdescriptors to download. This keeps us from
  2610. erroneous download behavior if two microdescriptor digests ever
  2611. have the same first 160 bits. Fixes part of bug 13399; bugfix
  2612. on
  2613. - Reset a router's status if its microdescriptor digest changes,
  2614. even if the first 160 bits remain the same. Fixes part of bug
  2615. 13399; bugfix on
  2616. o Minor bugfixes (client, torrc):
  2617. - Stop modifying the value of our DirReqStatistics torrc option just
  2618. because we're not a bridge or relay. This bug was causing Tor
  2619. Browser users to write "DirReqStatistics 0" in their torrc files
  2620. as if they had chosen to change the config. Fixes bug 4244; bugfix
  2621. on
  2622. - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
  2623. that our options have changed every time we SIGHUP. Fixes bug
  2624. 9801; bugfix on Patch from "qwerty1".
  2625. o Minor bugfixes (compilation):
  2626. - Fix a compilation warning on s390. Fixes bug 14988; bugfix
  2627. on
  2628. - Silence clang warnings under --enable-expensive-hardening,
  2629. including implicit truncation of 64 bit values to 32 bit, const
  2630. char assignment to self, tautological compare, and additional
  2631. parentheses around equality tests. Fixes bug 13577; bugfix
  2632. on
  2633. - Fix a clang warning about checking whether an address in the
  2634. middle of a structure is NULL. Fixes bug 14001; bugfix
  2635. on
  2636. - The address of an array in the middle of a structure will always
  2637. be non-NULL. clang recognises this and complains. Disable the
  2638. tautologous and redundant check to silence this warning. Fixes bug
  2639. 14001; bugfix on
  2640. - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
  2641. Addresses ticket 14188.
  2642. - Build without warnings with the stock OpenSSL srtp.h header, which
  2643. has a duplicate declaration of SSL_get_selected_srtp_profile().
  2644. Fixes bug 14220; this is OpenSSL's bug, not ours.
  2645. - Do not compile any code related to Tor2Web mode when Tor2Web mode
  2646. is not enabled at compile time. Previously, this code was included
  2647. in a disabled state. See discussion on ticket 12844.
  2648. - Allow our configure script to build correctly with autoconf 2.62
  2649. again. Fixes bug 12693; bugfix on
  2650. - Improve the error message from ./configure to make it clear that
  2651. when asciidoc has not been found, the user will have to either add
  2652. --disable-asciidoc argument or install asciidoc. Resolves
  2653. ticket 13228.
  2654. o Minor bugfixes (controller):
  2655. - Report "down" in response to the "GETINFO entry-guards" command
  2656. when relays are down with an unreachable_since value. Previously,
  2657. we would report "up". Fixes bug 14184; bugfix on
  2658. - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
  2659. 14116; bugfix on
  2660. o Minor bugfixes (controller):
  2661. - Return an error when the second or later arguments of the
  2662. "setevents" controller command are invalid events. Previously we
  2663. would return success while silently skipping invalid events. Fixes
  2664. bug 13205; bugfix on Reported by "fpxnns".
  2665. o Minor bugfixes (directory authority):
  2666. - Allow directory authorities to fetch more data from one another if
  2667. they find themselves missing lots of votes. Previously, they had
  2668. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  2669. bugfix on
  2670. - Do not attempt to download extrainfo documents which we will be
  2671. unable to validate with a matching server descriptor. Fixes bug
  2672. 13762; bugfix on
  2673. - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
  2674. control port. Fixes bug 14953; bugfix on
  2675. - Enlarge the buffer to read bwauth generated files to avoid an
  2676. issue when parsing the file in dirserv_read_measured_bandwidths().
  2677. Fixes bug 14125; bugfix on
  2678. - When running as a v3 directory authority, advertise that you serve
  2679. extra-info documents so that clients who want them can find them
  2680. from you too. Fixes part of bug 11683; bugfix on
  2681. o Minor bugfixes (directory system):
  2682. - Always believe that v3 directory authorities serve extra-info
  2683. documents, whether they advertise "caches-extra-info" or not.
  2684. Fixes part of bug 11683; bugfix on
  2685. - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
  2686. Previously, directories offering BRIDGE_DIRINFO and some other
  2687. flag (i.e. microdescriptors or extrainfo) would be ignored when
  2688. looking for bridges. Partially fixes bug 13163; bugfix
  2689. on
  2690. o Minor bugfixes (file handling):
  2691. - Stop failing when key files are zero-length. Instead, generate new
  2692. keys, and overwrite the empty key files. Fixes bug 13111; bugfix
  2693. on all versions of Tor. Patch by "teor".
  2694. - Stop generating a fresh .old RSA onion key file when the .old file
  2695. is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
  2696. - Avoid overwriting .old key files with empty key files.
  2697. - Skip loading zero-length extrainfo store, router store, stats,
  2698. state, and key files.
  2699. - Avoid crashing when trying to reload a torrc specified as a
  2700. relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
  2701. on
  2702. o Minor bugfixes (hidden services):
  2703. - Close the introduction circuit when we have no more usable intro
  2704. points, instead of waiting for it to time out. This also ensures
  2705. that no follow-up HS descriptor fetch is triggered when the
  2706. circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
  2707. - When fetching a hidden service descriptor for a down service that
  2708. was recently up, do not keep refetching until we try the same
  2709. replica twice in a row. Fixes bug 14219; bugfix on
  2710. - Correctly send a controller event when we find that a rendezvous
  2711. circuit has finished. Fixes bug 13936; bugfix on
  2712. - Pre-check directory permissions for new hidden-services to avoid
  2713. at least one case of "Bug: Acting on config options left us in a
  2714. broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
  2715. - When fetching hidden service descriptors, we now check not only
  2716. for whether we got the hidden service we had in mind, but also
  2717. whether we got the particular descriptors we wanted. This prevents
  2718. a class of inefficient but annoying DoS attacks by hidden service
  2719. directories. Fixes bug 13214; bugfix on Reported
  2720. by "special".
  2721. o Minor bugfixes (Linux seccomp2 sandbox):
  2722. - Make transparent proxy support work along with the seccomp2
  2723. sandbox. Fixes part of bug 13808; bugfix on Patch
  2724. by Francisco Blas Izquierdo Riera.
  2725. - Fix a memory leak in tor-resolve when running with the sandbox
  2726. enabled. Fixes bug 14050; bugfix on
  2727. - Allow glibc fatal errors to be sent to stderr before Tor exits.
  2728. Previously, glibc would try to write them to /dev/tty, and the
  2729. sandbox would trap the call and make Tor exit prematurely. Fixes
  2730. bug 14759; bugfix on
  2731. o Minor bugfixes (logging):
  2732. - Avoid crashing when there are more log domains than entries in
  2733. domain_list. Bugfix on
  2734. - Downgrade warnings about RSA signature failures to info log level.
  2735. Emit a warning when an extra info document is found incompatible
  2736. with a corresponding router descriptor. Fixes bug 9812; bugfix
  2737. on 0.0.6rc3.
  2738. - Make connection_ap_handshake_attach_circuit() log the circuit ID
  2739. correctly. Fixes bug 13701; bugfix on 0.0.6.
  2740. o Minor bugfixes (networking):
  2741. - Check for orconns and use connection_or_close_for_error() rather
  2742. than connection_mark_for_close() directly in the getsockopt()
  2743. failure case of connection_handle_write_impl(). Fixes bug 11302;
  2744. bugfix on
  2745. o Minor bugfixes (parsing):
  2746. - Stop accepting milliseconds (or other junk) at the end of
  2747. descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
  2748. - Support two-number and three-number version numbers correctly, in
  2749. case we change the Tor versioning system in the future. Fixes bug
  2750. 13661; bugfix on 0.0.8pre1.
  2751. o Minor bugfixes (portability):
  2752. - Fix the ioctl()-based network interface lookup code so that it
  2753. will work on systems that have variable-length struct ifreq, for
  2754. example Mac OS X.
  2755. - Use the correct datatype in the SipHash-2-4 function to prevent
  2756. compilers from assuming any sort of alignment. Fixes bug 15436;
  2757. bugfix on
  2758. o Minor bugfixes (preventative security, C safety):
  2759. - When reading a hexadecimal, base-32, or base-64 encoded value from
  2760. a string, always overwrite the whole output buffer. This prevents
  2761. some bugs where we would look at (but fortunately, not reveal)
  2762. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  2763. versions of Tor.
  2764. - Clear all memory targetted by tor_addr_{to,from}_sockaddr(), not
  2765. just the part that's used. This makes it harder for data leak bugs
  2766. to occur in the event of other programming failures. Resolves
  2767. ticket 14041.
  2768. o Minor bugfixes (relay):
  2769. - When generating our family list, remove spaces from around the
  2770. entries. Fixes bug 12728; bugfix on
  2771. - If our previous bandwidth estimate was 0 bytes, allow publishing a
  2772. new relay descriptor immediately. Fixes bug 13000; bugfix
  2773. on
  2774. o Minor bugfixes (shutdown):
  2775. - When shutting down, always call event_del() on lingering read or
  2776. write events before freeing them. Otherwise, we risk double-frees
  2777. or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
  2778. on
  2779. o Minor bugfixes (small memory leaks):
  2780. - Avoid leaking memory when using IPv6 virtual address mappings.
  2781. Fixes bug 14123; bugfix on Patch by Tom van
  2782. der Woerdt.
  2783. o Minor bugfixes (statistics):
  2784. - Increase period over which bandwidth observations are aggregated
  2785. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  2786. o Minor bugfixes (systemd support):
  2787. - Run correctly under systemd with the RunAsDaemon option set. Fixes
  2788. part of bug 14141; bugfix on Patch from Tomasz Torcz.
  2789. - Inform the systemd supervisor about more changes in the Tor
  2790. process status. Implements part of ticket 14141. Patch from
  2791. Tomasz Torcz.
  2792. o Minor bugfixes (testing networks):
  2793. - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
  2794. testing network. Fixes bug 13064; bugfix on
  2795. - Stop using the default authorities in networks which provide both
  2796. AlternateDirAuthority and AlternateBridgeAuthority. Partially
  2797. fixes bug 13163; bugfix on
  2798. o Minor bugfixes (testing networks, fast startup):
  2799. - Allow Tor to build circuits using a consensus with no exits. If
  2800. the consensus has no exits (typical of a bootstrapping test
  2801. network), allow Tor to build circuits once enough descriptors have
  2802. been downloaded. This assists in bootstrapping a testing Tor
  2803. network. Fixes bug 13718; bugfix on Patch
  2804. by "teor".
  2805. - When V3AuthVotingInterval is low, give a lower If-Modified-Since
  2806. header to directory servers. This allows us to obtain consensuses
  2807. promptly when the consensus interval is very short. This assists
  2808. in bootstrapping a testing Tor network. Fixes parts of bugs 13718
  2809. and 13963; bugfix on Patch by "teor".
  2810. - Stop assuming that private addresses are local when checking
  2811. reachability in a TestingTorNetwork. Instead, when testing, assume
  2812. all OR connections are remote. (This is necessary due to many test
  2813. scenarios running all relays on localhost.) This assists in
  2814. bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
  2815. Patch by "teor".
  2816. - Avoid building exit circuits from a consensus with no exits. Now
  2817. thanks to our fix for 13718, we accept a no-exit network as not
  2818. wholly lost, but we need to remember not to try to build exit
  2819. circuits on it. Closes ticket 13814; patch by "teor".
  2820. - Stop requiring exits to have non-zero bandwithcapacity in a
  2821. TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
  2822. ignore exit bandwidthcapacity. This assists in bootstrapping a
  2823. testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
  2824. on Patch by "teor".
  2825. - Add "internal" to some bootstrap statuses when no exits are
  2826. available. If the consensus does not contain Exits, Tor will only
  2827. build internal circuits. In this case, relevant statuses will
  2828. contain the word "internal" as indicated in the Tor control-
  2829. spec.txt. When bootstrap completes, Tor will be ready to build
  2830. internal circuits. If a future consensus contains Exits, exit
  2831. circuits may become available. Fixes part of bug 13718; bugfix on
  2832. Patch by "teor".
  2833. - Decrease minimum consensus interval to 10 seconds when
  2834. TestingTorNetwork is set, or 5 seconds for the first consensus.
  2835. Fix assumptions throughout the code that assume larger intervals.
  2836. Fixes bugs 13718 and 13823; bugfix on Patch
  2837. by "teor".
  2838. - Avoid excluding guards from path building in minimal test
  2839. networks, when we're in a test network and excluding guards would
  2840. exclude all relays. This typically occurs in incredibly small tor
  2841. networks, and those using "TestingAuthVoteGuard *". Fixes part of
  2842. bug 13718; bugfix on Patch by "teor".
  2843. o Minor bugfixes (testing):
  2844. - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
  2845. 15188; bugfix on Patch from Tom van der Woerdt.
  2846. - Stop spawn test failures due to a race condition between the
  2847. SIGCHLD handler updating the process status, and the test reading
  2848. it. Fixes bug 13291; bugfix on
  2849. - Avoid passing an extra backslash when creating a temporary
  2850. directory for running the unit tests on Windows. Fixes bug 12392;
  2851. bugfix on Patch from Gisle Vanem.
  2852. o Minor bugfixes (TLS):
  2853. - Check more thoroughly throughout the TLS code for possible
  2854. unlogged TLS errors. Possible diagnostic or fix for bug 13319.
  2855. o Minor bugfixes (transparent proxy):
  2856. - Use getsockname, not getsockopt, to retrieve the address for a
  2857. TPROXY-redirected connection. Fixes bug 13796; bugfix
  2858. on
  2859. o Minor bugfixes (windows):
  2860. - Remove code to special-case handling of NTE_BAD_KEYSET when
  2861. acquiring windows CryptoAPI context. This error can't actually
  2862. occur for the parameters we're providing. Fixes bug 10816; bugfix
  2863. on 0.0.2pre26.
  2864. o Minor bugfixes (zlib):
  2865. - Avoid truncating a zlib stream when trying to finalize it with an
  2866. empty output buffer. Fixes bug 11824; bugfix on
  2867. o Code simplification and refactoring:
  2868. - Change the entry_is_live() function to take named bitfield
  2869. elements instead of an unnamed list of booleans. Closes
  2870. ticket 12202.
  2871. - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
  2872. Resolves ticket 12205.
  2873. - Use calloc and reallocarray functions instead of multiply-
  2874. then-malloc. This makes it less likely for us to fall victim to an
  2875. integer overflow attack when allocating. Resolves ticket 12855.
  2876. - Use the standard macro name SIZE_MAX, instead of our
  2877. own SIZE_T_MAX.
  2878. - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
  2879. functions which take them as arguments. Replace 0 with NO_DIRINFO
  2880. in a function call for clarity. Seeks to prevent future issues
  2881. like 13163.
  2882. - Avoid 4 null pointer errors under clang static analysis by using
  2883. tor_assert() to prove that the pointers aren't null. Fixes
  2884. bug 13284.
  2885. - Rework the API of policies_parse_exit_policy() to use a bitmask to
  2886. represent parsing options, instead of a confusing mess of
  2887. booleans. Resolves ticket 8197.
  2888. - Introduce a helper function to parse ExitPolicy in
  2889. or_options_t structure.
  2890. - Move fields related to isolating and configuring client ports into
  2891. a shared structure. Previously, they were duplicated across
  2892. port_cfg_t, listener_connection_t, and edge_connection_t. Failure
  2893. to copy them correctly had been the cause of at least one bug in
  2894. the past. Closes ticket 8546.
  2895. - Refactor the get_interface_addresses_raw() doom-function into
  2896. multiple smaller and simpler subfunctions. Cover the resulting
  2897. subfunctions with unit-tests. Fixes a significant portion of
  2898. issue 12376.
  2899. - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
  2900. only for version <= which is now deprecated. Closes
  2901. ticket 14202.
  2902. - Remove a test for a long-defunct broken version-one
  2903. directory server.
  2904. - Refactor main loop to extract the 'loop' part. This makes it
  2905. easier to run Tor under Shadow. Closes ticket 15176.
  2906. - Stop using can_complete_circuits as a global variable; access it
  2907. with a function instead.
  2908. - Avoid using operators directly as macro arguments: this lets us
  2909. apply coccinelle transformations to our codebase more directly.
  2910. Closes ticket 13172.
  2911. - Combine the functions used to parse ClientTransportPlugin and
  2912. ServerTransportPlugin into a single function. Closes ticket 6456.
  2913. - Add inline functions and convenience macros for inspecting channel
  2914. state. Refactor the code to use convenience macros instead of
  2915. checking channel state directly. Fixes issue 7356.
  2916. - Document all members of was_router_added_t and rename
  2918. confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
  2919. - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
  2920. constant instead of hardcoded value. Fixes issue 13840.
  2921. - Refactor our generic strmap and digestmap types into a single
  2922. implementation, so that we can add a new digest256map
  2923. type trivially.
  2924. o Documentation:
  2925. - Add a doc/TUNING document with tips for handling large numbers of
  2926. TCP connections when running busy Tor relay. Update the warning
  2927. message to point to this file when running out of sockets
  2928. operating system is allowing to use simultaneously. Resolves
  2929. ticket 9708.
  2930. - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
  2931. for writing the OpenBSD-specific tips. Resolves ticket 13702.
  2932. - Make the tor-resolve documentation match its help string and its
  2933. options. Resolves part of ticket 14325.
  2934. - Log a more useful error message from tor-resolve when failing to
  2935. look up a hidden service address. Resolves part of ticket 14325.
  2936. - Document the bridge-authority-only 'networkstatus-bridges' file.
  2937. Closes ticket 13713; patch from "tom".
  2938. - Fix typo in PredictedPortsRelevanceTime option description in
  2939. manpage. Resolves issue 13707.
  2940. - Stop suggesting that users specify relays by nickname: it isn't a
  2941. good idea. Also, properly cross-reference how to specify relays in
  2942. all parts of manual documenting options that take a list of
  2943. relays. Closes ticket 13381.
  2944. - Clarify the HiddenServiceDir option description in manpage to make
  2945. it clear that relative paths are taken with respect to the current
  2946. working directory. Also clarify that this behavior is not
  2947. guaranteed to remain indefinitely. Fixes issue 13913.
  2948. o Distribution (systemd):
  2949. - systemd unit file: only allow tor to write to /var/lib/tor and
  2950. /var/log/tor. The rest of the filesystem is accessible for reading
  2951. only. Patch by intrigeri; resolves ticket 12751.
  2952. - systemd unit file: ensure that the process and all its children
  2953. can never gain new privileges. Patch by intrigeri; resolves
  2954. ticket 12939.
  2955. - systemd unit file: set up /var/run/tor as writable for the Tor
  2956. service. Patch by intrigeri; resolves ticket 13196.
  2957. o Downgraded warnings:
  2958. - Don't warn when we've attempted to contact a relay using the wrong
  2959. ntor onion key. Closes ticket 9635.
  2960. o Removed code:
  2961. - Remove some lingering dead code that once supported mempools.
  2962. Mempools were disabled by default in 0.2.5, and removed entirely
  2963. in Closes more of ticket 14848; patch
  2964. by "cypherpunks".
  2965. o Removed features (directory authorities):
  2966. - Remove code that prevented authorities from listing Tor relays
  2967. affected by CVE-2011-2769 as guards. These relays are already
  2968. rejected altogether due to the minimum version requirement of
  2969. Closes ticket 13152.
  2970. - The "AuthDirRejectUnlisted" option no longer has any effect, as
  2971. the fingerprints file (approved-routers) has been deprecated.
  2972. - Directory authorities do not support being Naming dirauths anymore.
  2973. The "NamingAuthoritativeDir" config option is now obsolete.
  2974. - Directory authorities do not support giving out the BadDirectory
  2975. flag anymore.
  2976. - Directory authorities no longer advertise or support consensus
  2977. methods 1 through 12 inclusive. These consensus methods were
  2978. obsolete and/or insecure: maintaining the ability to support them
  2979. served no good purpose. Implements part of proposal 215; closes
  2980. ticket 10163.
  2981. o Removed features:
  2982. - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
  2983. longer silently accepted as an alias for "ExitNodes".
  2984. - The --enable-mempool and --enable-buf-freelists options, which
  2985. were originally created to work around bad malloc implementations,
  2986. no longer exist. They were off-by-default in 0.2.5. Closes
  2987. ticket 14848.
  2988. - We no longer remind the user about configuration options that have
  2989. been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
  2990. - Remove our old, non-weighted bandwidth-based node selection code.
  2991. Previously, we used it as a fallback when we couldn't perform
  2992. weighted bandwidth-based node selection. But that would only
  2993. happen in the cases where we had no consensus, or when we had a
  2994. consensus generated by buggy or ancient directory authorities. In
  2995. either case, it's better to use the more modern, better maintained
  2996. algorithm, with reasonable defaults for the weights. Closes
  2997. ticket 13126.
  2998. - Remove the --disable-curve25519 configure option. Relays and
  2999. clients now are required to support curve25519 and the
  3000. ntor handshake.
  3001. - The old "StrictEntryNodes" and "StrictExitNodes" options, which
  3002. used to be deprecated synonyms for "StrictNodes", are now marked
  3003. obsolete. Resolves ticket 12226.
  3004. - Clients don't understand the BadDirectory flag in the consensus
  3005. anymore, and ignore it.
  3006. o Removed platform support:
  3007. - We no longer include special code to build on Windows CE; as far
  3008. as we know, nobody has used Tor on Windows CE in a very long time.
  3009. Closes ticket 11446.
  3010. o Testing (
  3011. - Stop using "echo -n", as some shells' built-in echo doesn't
  3012. support "-n". Instead, use "/bin/echo -n". Partially fixes
  3013. bug 13161.
  3014. - Stop an apparent test-network hang when used with make -j2. Fixes
  3015. bug 13331.
  3016. - Add a --delay option to, which configures the
  3017. delay before the chutney network tests for data transmission.
  3018. Partially implements ticket 13161.
  3019. o Testing:
  3020. - Test that tor does not fail when key files are zero-length. Check
  3021. that tor generates new keys, and overwrites the empty key files.
  3022. - Test that tor generates new keys when keys are missing
  3023. (existing behavior).
  3024. - Test that tor does not overwrite key files that already contain
  3025. data (existing behavior). Tests bug 13111. Patch by "teor".
  3026. - New "make test-stem" target to run stem integration tests.
  3027. Requires that the "STEM_SOURCE_DIR" environment variable be set.
  3028. Closes ticket 14107.
  3029. - Make the script work correctly on Windows.
  3030. Patch from Gisle Vanem.
  3031. - Move the slower unit tests into a new "./src/test/test-slow"
  3032. binary that can be run independently of the other tests. Closes
  3033. ticket 13243.
  3034. - New tests for many parts of channel, relay, and circuitmux
  3035. functionality. Code by Andrea; part of 9262.
  3036. - New tests for parse_transport_line(). Part of ticket 6456.
  3037. - In the unit tests, use chgrp() to change the group of the unit
  3038. test temporary directory to the current user, so that the sticky
  3039. bit doesn't interfere with tests that check directory groups.
  3040. Closes 13678.
  3041. - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
  3042. by 'rl1987'.
  3043. - Refactor the function that chooses guard nodes so that it can more
  3044. easily be tested; write some tests for it.
  3045. - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
  3046. bugfix on Patch from "cypherpunks."
  3047. - Create unit tests for format_time_interval(). With bug 13393.
  3048. - Add unit tests for tor_timegm signed overflow, tor_timegm and
  3049. parse_rfc1123_time validity checks, correct_tm year clamping. Unit
  3050. tests (visible) fixes in bug 13476.
  3051. - Add a "coverage-html" make target to generate HTML-visualized
  3052. coverage results when building with --enable-coverage. (Requires
  3053. lcov.) Patch from Kevin Murray.
  3054. - Enable the backtrace handler (where supported) when running the
  3055. unit tests.
  3056. - Revise all unit tests that used the legacy test_* macros to
  3057. instead use the recommended tt_* macros. This patch was generated
  3058. with coccinelle, to avoid manual errors. Closes ticket 13119.
  3059. Changes in version - 2015-03-17
  3060. Tor is the second stable release in the 0.2.5 series.
  3061. It backports several bugfixes from the 0.2.6 branch, including a
  3062. couple of medium-level security fixes for relays and exit nodes.
  3063. It also updates the list of directory authorities.
  3064. o Directory authority changes:
  3065. - Remove turtles as a directory authority.
  3066. - Add longclaw as a new (v3) directory authority. This implements
  3067. ticket 13296. This keeps the directory authority count at 9.
  3068. - The directory authority Faravahar has a new IP address. This
  3069. closes ticket 14487.
  3070. o Major bugfixes (crash, OSX, security):
  3071. - Fix a remote denial-of-service opportunity caused by a bug in
  3072. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  3073. in OSX 10.9.
  3074. o Major bugfixes (relay, stability, possible security):
  3075. - Fix a bug that could lead to a relay crashing with an assertion
  3076. failure if a buffer of exactly the wrong layout was passed to
  3077. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  3078. Patch from 'cypherpunks'.
  3079. - Do not assert if the 'data' pointer on a buffer is advanced to the
  3080. very end of the buffer; log a BUG message instead. Only assert if
  3081. it is past that point. Fixes bug 15083; bugfix on
  3082. o Major bugfixes (exit node stability):
  3083. - Fix an assertion failure that could occur under high DNS load.
  3084. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  3085. diagnosed and fixed by "cypherpunks".
  3086. o Major bugfixes (Linux seccomp2 sandbox):
  3087. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  3088. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  3089. Patch from "sanic".
  3090. o Minor features (controller):
  3091. - New "GETINFO bw-event-cache" to get information about recent
  3092. bandwidth events. Closes ticket 14128. Useful for controllers to
  3093. get recent bandwidth history after the fix for ticket 13988.
  3094. o Minor features (geoip):
  3095. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  3096. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  3097. Country database.
  3098. o Minor bugfixes (client, automapping):
  3099. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  3100. no value follows the option. Fixes bug 14142; bugfix on
  3101. Patch by "teor".
  3102. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  3103. 14195; bugfix on
  3104. o Minor bugfixes (compilation):
  3105. - Build without warnings with the stock OpenSSL srtp.h header, which
  3106. has a duplicate declaration of SSL_get_selected_srtp_profile().
  3107. Fixes bug 14220; this is OpenSSL's bug, not ours.
  3108. o Minor bugfixes (directory authority):
  3109. - Allow directory authorities to fetch more data from one another if
  3110. they find themselves missing lots of votes. Previously, they had
  3111. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  3112. bugfix on
  3113. - Enlarge the buffer to read bwauth generated files to avoid an
  3114. issue when parsing the file in dirserv_read_measured_bandwidths().
  3115. Fixes bug 14125; bugfix on
  3116. o Minor bugfixes (statistics):
  3117. - Increase period over which bandwidth observations are aggregated
  3118. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  3119. o Minor bugfixes (preventative security, C safety):
  3120. - When reading a hexadecimal, base-32, or base-64 encoded value from
  3121. a string, always overwrite the whole output buffer. This prevents
  3122. some bugs where we would look at (but fortunately, not reveal)
  3123. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  3124. versions of Tor.
  3125. Changes in version - 2015-03-17
  3126. Tor includes an updated list of directory authorities. It
  3127. also backports a couple of stability and security bugfixes from 0.2.5
  3128. and beyond.
  3129. o Directory authority changes:
  3130. - Remove turtles as a directory authority.
  3131. - Add longclaw as a new (v3) directory authority. This implements
  3132. ticket 13296. This keeps the directory authority count at 9.
  3133. - The directory authority Faravahar has a new IP address. This
  3134. closes ticket 14487.
  3135. o Major bugfixes (exit node stability, also in
  3136. - Fix an assertion failure that could occur under high DNS load.
  3137. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  3138. diagnosed and fixed by "cypherpunks".
  3139. o Major bugfixes (relay, stability, possible security, also in
  3140. - Fix a bug that could lead to a relay crashing with an assertion
  3141. failure if a buffer of exactly the wrong layout was passed to
  3142. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  3143. Patch from 'cypherpunks'.
  3144. - Do not assert if the 'data' pointer on a buffer is advanced to the
  3145. very end of the buffer; log a BUG message instead. Only assert if
  3146. it is past that point. Fixes bug 15083; bugfix on
  3147. o Minor features (geoip):
  3148. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  3149. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  3150. Country database.
  3151. Changes in version - 2014-10-24
  3152. Tor is the first stable release in the 0.2.5 series.
  3153. It adds several new security features, including improved
  3154. denial-of-service resistance for relays, new compiler hardening
  3155. options, and a system-call sandbox for hardened installations on Linux
  3156. (requires seccomp2). The controller protocol has several new features,
  3157. resolving IPv6 addresses should work better than before, and relays
  3158. should be a little more CPU-efficient. We've added support for more
  3159. OpenBSD and FreeBSD transparent proxy types. We've improved the build
  3160. system and testing infrastructure to allow unit testing of more parts
  3161. of the Tor codebase. Finally, we've addressed several nagging pluggable
  3162. transport usability issues, and included numerous other small bugfixes
  3163. and features mentioned below.
  3164. This release marks end-of-life for Tor 0.2.3.x; those Tor versions
  3165. have accumulated many known flaws; everyone should upgrade.
  3166. o Major features (security):
  3167. - The ntor handshake is now on-by-default, no matter what the
  3168. directory authorities recommend. Implements ticket 8561.
  3169. - Make the "tor-gencert" tool used by directory authority operators
  3170. create 2048-bit signing keys by default (rather than 1024-bit, since
  3171. 1024-bit is uncomfortably small these days). Addresses ticket 10324.
  3172. - Warn about attempts to run hidden services and relays in the same
  3173. process: that's probably not a good idea. Closes ticket 12908.
  3174. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  3175. today support TLS 1.0 or later, so we can safely turn off support
  3176. for this old (and insecure) protocol. Fixes bug 13426.
  3177. o Major features (relay security, DoS-resistance):
  3178. - When deciding whether we have run out of memory and we need to
  3179. close circuits, also consider memory allocated in buffers for
  3180. streams attached to each circuit.
  3181. This change, which extends an anti-DoS feature introduced in
  3182. and improved in, lets Tor exit relays
  3183. better resist more memory-based DoS attacks than before. Since the
  3184. MaxMemInCellQueues option now applies to all queues, it is renamed
  3185. to MaxMemInQueues. This feature fixes bug 10169.
  3186. - Avoid hash-flooding denial-of-service attacks by using the secure
  3187. SipHash-2-4 hash function for our hashtables. Without this
  3188. feature, an attacker could degrade performance of a targeted
  3189. client or server by flooding their data structures with a large
  3190. number of entries to be stored at the same hash table position,
  3191. thereby slowing down the Tor instance. With this feature, hash
  3192. table positions are derived from a randomized cryptographic key,
  3193. and an attacker cannot predict which entries will collide. Closes
  3194. ticket 4900.
  3195. - If you don't specify MaxMemInQueues yourself, Tor now tries to
  3196. pick a good value based on your total system memory. Previously,
  3197. the default was always 8 GB. You can still override the default by
  3198. setting MaxMemInQueues yourself. Resolves ticket 11396.
  3199. o Major features (bridges and pluggable transports):
  3200. - Add support for passing arguments to managed pluggable transport
  3201. proxies. Implements ticket 3594.
  3202. - Bridges now track GeoIP information and the number of their users
  3203. even when pluggable transports are in use, and report usage
  3204. statistics in their extra-info descriptors. Resolves tickets 4773
  3205. and 5040.
  3206. - Don't launch pluggable transport proxies if we don't have any
  3207. bridges configured that would use them. Now we can list many
  3208. pluggable transports, and Tor will dynamically start one when it
  3209. hears a bridge address that needs it. Resolves ticket 5018.
  3210. - The bridge directory authority now assigns status flags (Stable,
  3211. Guard, etc) to bridges based on thresholds calculated over all
  3212. Running bridges. Now bridgedb can finally make use of its features
  3213. to e.g. include at least one Stable bridge in its answers. Fixes
  3214. bug 9859.
  3215. o Major features (controller):
  3216. - Extend ORCONN controller event to include an "ID" parameter,
  3217. and add four new controller event types CONN_BW, CIRC_BW,
  3218. CELL_STATS, and TB_EMPTY that show connection and circuit usage.
  3219. The new events are emitted in private Tor networks only, with the
  3220. goal of being able to better track performance and load during
  3221. full-network simulations. Implements proposal 218 and ticket 7359.
  3222. o Major features (relay performance):
  3223. - Speed up server-side lookups of rendezvous and introduction point
  3224. circuits by using hashtables instead of linear searches. These
  3225. functions previously accounted between 3 and 7% of CPU usage on
  3226. some busy relays. Resolves ticket 9841.
  3227. - Avoid wasting CPU when extending a circuit over a channel that is
  3228. nearly out of circuit IDs. Previously, we would do a linear scan
  3229. over possible circuit IDs before finding one or deciding that we
  3230. had exhausted our possibilities. Now, we try at most 64 random
  3231. circuit IDs before deciding that we probably won't succeed. Fixes
  3232. a possible root cause of ticket 11553.
  3233. o Major features (seccomp2 sandbox, Linux only):
  3234. - Use the seccomp2 syscall filtering facility on Linux to limit
  3235. which system calls Tor can invoke. This is an experimental,
  3236. Linux-only feature to provide defense-in-depth against unknown
  3237. attacks. To try turning it on, set "Sandbox 1" in your torrc
  3238. file. Please be ready to report bugs. We hope to add support
  3239. for better sandboxing in the future, including more fine-grained
  3240. filters, better division of responsibility, and support for more
  3241. platforms. This work has been done by Cristian-Matei Toader for
  3242. Google Summer of Code. Resolves tickets 11351 and 11465.
  3243. o Major features (testing networks):
  3244. - Make testing Tor networks bootstrap better: lower directory fetch
  3245. retry schedules and maximum interval without directory requests,
  3246. and raise maximum download tries. Implements ticket 6752.
  3247. - Add make target 'test-network' to run tests on a Chutney network.
  3248. Implements ticket 8530.
  3249. o Major features (other):
  3250. - On some platforms (currently: recent OSX versions, glibc-based
  3251. platforms that support the ELF format, and a few other
  3252. Unix-like operating systems), Tor can now dump stack traces
  3253. when a crash occurs or an assertion fails. By default, traces
  3254. are dumped to stderr (if possible) and to any logs that are
  3255. reporting errors. Implements ticket 9299.
  3256. o Deprecated versions:
  3257. - Tor 0.2.3.x has reached end-of-life; it has received no patches or
  3258. attention for some while.
  3259. o Major bugfixes (security, directory authorities):
  3260. - Directory authorities now include a digest of each relay's
  3261. identity key as a part of its microdescriptor.
  3262. This is a workaround for bug 11743 (reported by "cypherpunks"),
  3263. where Tor clients do not support receiving multiple
  3264. microdescriptors with the same SHA256 digest in the same
  3265. consensus. When clients receive a consensus like this, they only
  3266. use one of the relays. Without this fix, a hostile relay could
  3267. selectively disable some client use of target relays by
  3268. constructing a router descriptor with a different identity and the
  3269. same microdescriptor parameters and getting the authorities to
  3270. list it in a microdescriptor consensus. This fix prevents an
  3271. attacker from causing a microdescriptor collision, because the
  3272. router's identity is not forgeable.
  3273. o Major bugfixes (openssl bug workaround):
  3274. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  3275. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
  3276. bug 13471. This is a workaround for an OpenSSL bug.
  3277. o Major bugfixes (client):
  3278. - Perform circuit cleanup operations even when circuit
  3279. construction operations are disabled (because the network is
  3280. disabled, or because there isn't enough directory information).
  3281. Previously, when we were not building predictive circuits, we
  3282. were not closing expired circuits either. Fixes bug 8387; bugfix on
  3283. This bug became visible in when we
  3284. became more strict about when we have "enough directory information
  3285. to build circuits".
  3286. o Major bugfixes (client, pluggable transports):
  3287. - When managing pluggable transports, use OS notification facilities
  3288. to learn if they have crashed, and don't attempt to kill any
  3289. process that has already exited. Fixes bug 8746; bugfix
  3290. on
  3291. o Major bugfixes (relay denial of service):
  3292. - Instead of writing destroy cells directly to outgoing connection
  3293. buffers, queue them and intersperse them with other outgoing cells.
  3294. This can prevent a set of resource starvation conditions where too
  3295. many pending destroy cells prevent data cells from actually getting
  3296. delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
  3297. bugfix on
  3298. o Major bugfixes (relay):
  3299. - Avoid queuing or sending destroy cells for circuit ID zero when we
  3300. fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
  3301. Found and fixed by "cypherpunks".
  3302. - Fix ORPort reachability detection on relays running behind a
  3303. proxy, by correctly updating the "local" mark on the controlling
  3304. channel when changing the address of an or_connection_t after the
  3305. handshake. Fixes bug 12160; bugfix on
  3306. - Use a direct dirport connection when uploading non-anonymous
  3307. descriptors to the directory authorities. Previously, relays would
  3308. incorrectly use tunnel connections under a fairly wide variety of
  3309. circumstances. Fixes bug 11469; bugfix on
  3310. - When a circuit accidentally has the same circuit ID for its
  3311. forward and reverse direction, correctly detect the direction of
  3312. cells using that circuit. Previously, this bug made roughly one
  3313. circuit in a million non-functional. Fixes bug 12195; this is a
  3314. bugfix on every version of Tor.
  3315. o Minor features (security):
  3316. - New --enable-expensive-hardening option to enable security
  3317. hardening options that consume nontrivial amounts of CPU and
  3318. memory. Right now, this includes AddressSanitizer and UbSan, which
  3319. are supported in newer versions of GCC and Clang. Closes ticket
  3320. 11477.
  3321. - Authorities now assign the Guard flag to the fastest 25% of the
  3322. network (it used to be the fastest 50%). Also raise the consensus
  3323. weight that guarantees the Guard flag from 250 to 2000. For the
  3324. current network, this results in about 1100 guards, down from 2500.
  3325. This step paves the way for moving the number of entry guards
  3326. down to 1 (proposal 236) while still providing reasonable expected
  3327. performance for most users. Implements ticket 12690.
  3328. o Minor features (security, memory management):
  3329. - Memory allocation tricks (mempools and buffer freelists) are now
  3330. disabled by default. You can turn them back on with
  3331. --enable-mempools and --enable-buf-freelists respectively. We're
  3332. disabling these features because malloc performance is good enough
  3333. on most platforms, and a similar feature in OpenSSL exacerbated
  3334. exploitation of the Heartbleed attack. Resolves ticket 11476.
  3335. o Minor features (bridge client):
  3336. - Report a more useful failure message when we can't connect to a
  3337. bridge because we don't have the right pluggable transport
  3338. configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
  3339. o Minor features (bridge):
  3340. - Add an ExtORPortCookieAuthFileGroupReadable option to make the
  3341. cookie file for the ExtORPort g+r by default.
  3342. o Minor features (bridges, pluggable transports):
  3343. - Bridges now write the SHA1 digest of their identity key
  3344. fingerprint (that is, a hash of a hash of their public key) to
  3345. notice-level logs, and to a new hashed-fingerprint file. This
  3346. information will help bridge operators look up their bridge in
  3347. Globe and similar tools. Resolves ticket 10884.
  3348. - Improve the message that Tor displays when running as a bridge
  3349. using pluggable transports without an Extended ORPort listener.
  3350. Also, log the message in the log file too. Resolves ticket 11043.
  3351. - Add threshold cutoffs to the networkstatus document created by
  3352. the Bridge Authority. Fixes bug 1117.
  3353. - On Windows, spawn background processes using the CREATE_NO_WINDOW
  3354. flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
  3355. doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
  3356. Vidalia set this option for us.) Implements ticket 10297.
  3357. o Minor features (build):
  3358. - The configure script has a --disable-seccomp option to turn off
  3359. support for libseccomp on systems that have it, in case it (or
  3360. Tor's use of it) is broken. Resolves ticket 11628.
  3361. - Assume that a user using ./configure --host wants to cross-compile,
  3362. and give an error if we cannot find a properly named
  3363. tool-chain. Add a --disable-tool-name-check option to proceed
  3364. nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
  3365. - If we run ./configure and the compiler recognizes -fstack-protector
  3366. but the linker rejects it, warn the user about a potentially missing
  3367. libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
  3368. - Add support for `--library-versions` flag. Implements ticket 6384.
  3369. - Return the "unexpected sendme" warnings to a warn severity, but make
  3370. them rate limited, to help diagnose ticket 8093.
  3371. - Detect a missing asciidoc, and warn the user about it, during
  3372. configure rather than at build time. Fixes issue 6506. Patch from
  3373. Arlo Breault.
  3374. o Minor features (client):
  3375. - Add a new option, PredictedPortsRelevanceTime, to control how long
  3376. after having received a request to connect to a given port Tor
  3377. will try to keep circuits ready in anticipation of future requests
  3378. for that port. Patch from "unixninja92"; implements ticket 9176.
  3379. o Minor features (config options and command line):
  3380. - Add an --allow-missing-torrc commandline option that tells Tor to
  3381. run even if the configuration file specified by -f is not available.
  3382. Implements ticket 10060.
  3383. - Add support for the TPROXY transparent proxying facility on Linux.
  3384. See documentation for the new TransProxyType option for more
  3385. details. Implementation by "thomo". Closes ticket 10582.
  3386. o Minor features (config options):
  3387. - Config (torrc) lines now handle fingerprints which are missing
  3388. their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
  3389. - Support a --dump-config option to print some or all of the
  3390. configured options. Mainly useful for debugging the command-line
  3391. option parsing code. Helps resolve ticket 4647.
  3392. - Raise awareness of safer logging: notify user of potentially
  3393. unsafe config options, like logging more verbosely than severity
  3394. "notice" or setting SafeLogging to 0. Resolves ticket 5584.
  3395. - Add a new configuration option TestingV3AuthVotingStartOffset
  3396. that bootstraps a network faster by changing the timing for
  3397. consensus votes. Addresses ticket 8532.
  3398. - Add a new torrc option "ServerTransportOptions" that allows
  3399. bridge operators to pass configuration parameters to their
  3400. pluggable transports. Resolves ticket 8929.
  3401. - The config (torrc) file now accepts bandwidth and space limits in
  3402. bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
  3403. you can now say "16 kilobits", and so on.) Resolves ticket 9214.
  3404. Patch by CharlieB.
  3405. o Minor features (controller):
  3406. - Make the entire exit policy available from the control port via
  3407. GETINFO exit-policy/*. Implements enhancement 7952. Patch from
  3408. "rl1987".
  3409. - Because of the fix for ticket 11396, the real limit for memory
  3410. usage may no longer match the configured MaxMemInQueues value. The
  3411. real limit is now exposed via GETINFO limits/max-mem-in-queues.
  3412. - Add a new "HS_DESC" controller event that reports activities
  3413. related to hidden service descriptors. Resolves ticket 8510.
  3414. - New "DROPGUARDS" controller command to forget all current entry
  3415. guards. Not recommended for ordinary use, since replacing guards
  3416. too frequently makes several attacks easier. Resolves ticket 9934;
  3417. patch from "ra".
  3418. - Implement the TRANSPORT_LAUNCHED control port event that
  3419. notifies controllers about new launched pluggable
  3420. transports. Resolves ticket 5609.
  3421. o Minor features (diagnostic):
  3422. - When logging a warning because of bug 7164, additionally check the
  3423. hash table for consistency (as proposed on ticket 11737). This may
  3424. help diagnose bug 7164.
  3425. - When we log a heartbeat, log how many one-hop circuits we have
  3426. that are at least 30 minutes old, and log status information about
  3427. a few of them. This is an attempt to track down bug 8387.
  3428. - When encountering an unexpected CR while writing text to a file on
  3429. Windows, log the name of the file. Should help diagnosing
  3430. bug 11233.
  3431. - Give more specific warnings when a client notices that an onion
  3432. handshake has failed. Fixes ticket 9635.
  3433. - Add significant new logging code to attempt to diagnose bug 12184,
  3434. where relays seem to run out of available circuit IDs.
  3435. - Improve the diagnostic log message for bug 8387 even further to
  3436. try to improve our odds of figuring out why one-hop directory
  3437. circuits sometimes do not get closed.
  3438. - Add more log messages to diagnose bug 7164, which causes
  3439. intermittent "microdesc_free() called but md was still referenced"
  3440. warnings. We now include more information, to figure out why we
  3441. might be cleaning a microdescriptor for being too old if it's
  3442. still referenced by a live node_t object.
  3443. - Log current accounting state (bytes sent and received + remaining
  3444. time for the current accounting period) in the relay's heartbeat
  3445. message. Implements ticket 5526; patch from Peter Retzlaff.
  3446. o Minor features (geoip):
  3447. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  3448. Country database.
  3449. o Minor features (interface):
  3450. - Generate a warning if any ports are listed in the SocksPolicy,
  3451. DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
  3452. AuthDirBadExit options. (These options only support address
  3453. ranges.) Fixes part of ticket 11108.
  3454. o Minor features (kernel API usage):
  3455. - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
  3456. sockets in a single system call. Implements ticket 5129.
  3457. o Minor features (log messages):
  3458. - When ServerTransportPlugin is set on a bridge, Tor can write more
  3459. useful statistics about bridge use in its extrainfo descriptors,
  3460. but only if the Extended ORPort ("ExtORPort") is set too. Add a
  3461. log message to inform the user in this case. Resolves ticket 9651.
  3462. - When receiving a new controller connection, log the origin address.
  3463. Resolves ticket 9698; patch from "sigpipe".
  3464. - When logging OpenSSL engine status at startup, log the status of
  3465. more engines. Fixes ticket 10043; patch from Joshua Datko.
  3466. o Minor features (log verbosity):
  3467. - Demote the message that we give when a flushing connection times
  3468. out for too long from NOTICE to INFO. It was usually meaningless.
  3469. Resolves ticket 5286.
  3470. - Don't log so many notice-level bootstrapping messages at startup
  3471. about downloading descriptors. Previously, we'd log a notice
  3472. whenever we learned about more routers. Now, we only log a notice
  3473. at every 5% of progress. Fixes bug 9963.
  3474. - Warn less verbosely when receiving a malformed
  3475. ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
  3476. o Minor features (performance):
  3477. - If we're using the pure-C 32-bit curve25519_donna implementation
  3478. of curve25519, build it with the -fomit-frame-pointer option to
  3479. make it go faster on register-starved hosts. This improves our
  3480. handshake performance by about 6% on i386 hosts without nacl.
  3481. Closes ticket 8109.
  3482. o Minor features (relay):
  3483. - If a circuit timed out for at least 3 minutes, check if we have a
  3484. new external IP address, and publish a new descriptor with the new
  3485. IP address if it changed. Resolves ticket 2454.
  3486. o Minor features (testing):
  3487. - If Python is installed, "make check" now runs extra tests beyond
  3488. the unit test scripts.
  3489. - When bootstrapping a test network, sometimes very few relays get
  3490. the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
  3491. specify a set of relays which should be voted Guard regardless of
  3492. their uptime or bandwidth. Addresses ticket 9206.
  3493. o Minor features (transparent proxy, *BSD):
  3494. - Support FreeBSD's ipfw firewall interface for TransPort ports on
  3495. FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
  3496. 10267; patch from "yurivict".
  3497. - Support OpenBSD's divert-to rules with the pf firewall for
  3498. transparent proxy ports. To enable it, set "TransProxyType
  3499. pf-divert". This allows Tor to run a TransPort transparent proxy
  3500. port on OpenBSD 4.4 or later without root privileges. See the
  3501. pf.conf(5) manual page for information on configuring pf to use
  3502. divert-to rules. Closes ticket 10896; patch from Dana Koch.
  3503. o Minor bugfixes (bridge client):
  3504. - Stop accepting bridge lines containing hostnames. Doing so would
  3505. cause clients to perform DNS requests on the hostnames, which was
  3506. not sensible behavior. Fixes bug 10801; bugfix on
  3507. o Minor bugfixes (bridges):
  3508. - Avoid potential crashes or bad behavior when launching a
  3509. server-side managed proxy with ORPort or ExtORPort temporarily
  3510. disabled. Fixes bug 9650; bugfix on
  3511. - Fix a bug where the first connection works to a bridge that uses a
  3512. pluggable transport with client-side parameters, but we don't send
  3513. the client-side parameters on subsequent connections. (We don't
  3514. use any pluggable transports with client-side parameters yet,
  3515. but ScrambleSuit will soon become the first one.) Fixes bug 9162;
  3516. bugfix on Based on a patch from "rl1987".
  3517. o Minor bugfixes (build, auxiliary programs):
  3518. - Stop preprocessing the "torify" script with autoconf, since
  3519. it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
  3520. from Guilhem.
  3521. - The tor-fw-helper program now follows the standard convention and
  3522. exits with status code "0" on success. Fixes bug 9030; bugfix on
  3523. Patch by Arlo Breault.
  3524. - Corrected ./configure advice for what openssl dev package you should
  3525. install on Debian. Fixes bug 9207; bugfix on
  3526. o Minor bugfixes (client):
  3527. - Avoid "Tried to open a socket with DisableNetwork set" warnings
  3528. when starting a client with bridges configured and DisableNetwork
  3529. set. (Tor launcher starts Tor with DisableNetwork set the first
  3530. time it runs.) Fixes bug 10405; bugfix on
  3531. - Improve the log message when we can't connect to a hidden service
  3532. because all of the hidden service directory nodes hosting its
  3533. descriptor are excluded. Improves on our fix for bug 10722, which
  3534. was a bugfix on
  3535. - Raise a control port warning when we fail to connect to all of
  3536. our bridges. Previously, we didn't inform the controller, and
  3537. the bootstrap process would stall. Fixes bug 11069; bugfix on
  3539. - Exit immediately when a process-owning controller exits.
  3540. Previously, tor relays would wait for a little while after their
  3541. controller exited, as if they had gotten an INT signal -- but this
  3542. was problematic, since there was no feedback for the user. To do a
  3543. clean shutdown, controllers should send an INT signal and give Tor
  3544. a chance to clean up. Fixes bug 10449; bugfix on
  3545. - Stop attempting to connect to bridges before our pluggable
  3546. transports are configured (harmless but resulted in some erroneous
  3547. log messages). Fixes bug 11156; bugfix on
  3548. - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
  3549. generating incorrect SOCKS5 responses, and confusing client
  3550. applications. Fixes bug 10987; bugfix on
  3551. o Minor bugfixes (client, DNSPort):
  3552. - When using DNSPort, try to respond to AAAA requests with AAAA
  3553. answers. Previously, we hadn't looked at the request type when
  3554. deciding which answer type to prefer. Fixes bug 10468; bugfix on
  3556. - When receiving a DNS query for an unsupported record type, reply
  3557. with no answer rather than with a NOTIMPL error. This behavior
  3558. isn't correct either, but it will break fewer client programs, we
  3559. hope. Fixes bug 10268; bugfix on Original patch
  3560. from "epoch".
  3561. o Minor bugfixes (client, logging during bootstrap):
  3562. - Only report the first fatal bootstrap error on a given OR
  3563. connection. This stops us from telling the controller bogus error
  3564. messages like "DONE". Fixes bug 10431; bugfix on
  3565. - Avoid generating spurious warnings when starting with
  3566. DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
  3568. o Minor bugfixes (closing OR connections):
  3569. - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
  3570. check if it's an or_connection_t and correctly call
  3571. connection_or_close_for_error() rather than
  3572. connection_mark_for_close() directly. Fixes bug 11304; bugfix on
  3574. - When closing all connections on setting DisableNetwork to 1, use
  3575. connection_or_close_normally() rather than closing OR connections
  3576. out from under the channel layer. Fixes bug 11306; bugfix on
  3578. o Minor bugfixes (code correctness):
  3579. - Previously we used two temporary files when writing descriptors to
  3580. disk; now we only use one. Fixes bug 1376.
  3581. - Remove an erroneous (but impossible and thus harmless) pointer
  3582. comparison that would have allowed compilers to skip a bounds
  3583. check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
  3584. Noticed by Jared L Wong and David Fifield.
  3585. - Fix an always-true assertion in pluggable transports code so it
  3586. actually checks what it was trying to check. Fixes bug 10046;
  3587. bugfix on Found by "dcb".
  3588. o Minor bugfixes (command line):
  3589. - Use a single command-line parser for parsing torrc options on the
  3590. command line and for finding special command-line options to avoid
  3591. inconsistent behavior for torrc option arguments that have the same
  3592. names as command-line options. Fixes bugs 4647 and 9578; bugfix on
  3593. 0.0.9pre5.
  3594. - No longer allow 'tor --hash-password' with no arguments. Fixes bug
  3595. 9573; bugfix on 0.0.9pre5.
  3596. o Minor bugfixes (compilation):
  3597. - Compile correctly with builds and forks of OpenSSL (such as
  3598. LibreSSL) that disable compression. Fixes bug 12602; bugfix on
  3599. Patch from "dhill".
  3600. - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
  3601. turned off (that is, without support for v2 link handshakes). Fixes
  3602. bug 4677; bugfix on Patch from "piet".
  3603. - In routerlist_assert_ok(), don't take the address of a
  3604. routerinfo's cache_info member unless that routerinfo is non-NULL.
  3605. Fixes bug 13096; bugfix on Patch by "teor".
  3606. - Fix a large number of false positive warnings from the clang
  3607. analyzer static analysis tool. This should make real warnings
  3608. easier for clang analyzer to find. Patch from "teor". Closes
  3609. ticket 13036.
  3610. - Resolve GCC complaints on OpenBSD about discarding constness in
  3611. TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
  3612. on Patch from Dana Koch.
  3613. - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
  3614. treatment of long and time_t as comparable types. Fixes part of
  3615. bug 11633. Patch from Dana Koch.
  3616. - When deciding whether to build the 64-bit curve25519
  3617. implementation, detect platforms where we can compile 128-bit
  3618. arithmetic but cannot link it. Fixes bug 11729; bugfix on
  3619. Patch from "conradev".
  3620. - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
  3621. bugfix on Found by "cypherpunks".
  3622. - Fix compilation with dmalloc. Fixes bug 11605; bugfix
  3623. on
  3624. - Build and run correctly on systems like OpenBSD-current that have
  3625. patched OpenSSL to remove get_cipher_by_char and/or its
  3626. implementations. Fixes issue 13325.
  3627. o Minor bugfixes (controller and command-line):
  3628. - If changing a config option via "setconf" fails in a recoverable
  3629. way, we used to nonetheless write our new control ports to the
  3630. file described by the "ControlPortWriteToFile" option. Now we only
  3631. write out that file if we successfully switch to the new config
  3632. option. Fixes bug 5605; bugfix on Patch from "Ryman".
  3633. o Minor bugfixes (directory server):
  3634. - No longer accept malformed http headers when parsing urls from
  3635. headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
  3636. bugfix on 0.0.6pre1.
  3637. - When sending a compressed set of descriptors or microdescriptors,
  3638. make sure to finalize the zlib stream. Previously, we would write
  3639. all the compressed data, but if the last descriptor we wanted to
  3640. send was missing or too old, we would not mark the stream as
  3641. finished. This caused problems for decompression tools. Fixes bug
  3642. 11648; bugfix on
  3643. o Minor bugfixes (hidden service):
  3644. - Only retry attempts to connect to a chosen rendezvous point 8
  3645. times, not 30. Fixes bug 4241; bugfix on
  3646. o Minor bugfixes (interface):
  3647. - Reject relative control socket paths and emit a warning. Previously,
  3648. single-component control socket paths would be rejected, but Tor
  3649. would not log why it could not validate the config. Fixes bug 9258;
  3650. bugfix on
  3651. o Minor bugfixes (log messages):
  3652. - Fix a bug where clients using bridges would report themselves
  3653. as 50% bootstrapped even without a live consensus document.
  3654. Fixes bug 9922; bugfix on
  3655. - Suppress a warning where, if there's only one directory authority
  3656. in the network, we would complain that votes and signatures cannot
  3657. be uploaded to other directory authorities. Fixes bug 10842;
  3658. bugfix on
  3659. - Report bootstrapping progress correctly when we're downloading
  3660. microdescriptors. We had updated our "do we have enough microdescs
  3661. to begin building circuits?" logic most recently in
  3662. (see bug 5956), but we left the bootstrap status event logic at
  3663. "how far through getting 1/4 of them are we?" Fixes bug 9958;
  3664. bugfix on, which is where they diverged (see bug 5343).
  3665. o Minor bugfixes (logging):
  3666. - Downgrade "Unexpected onionskin length after decryption" warning
  3667. to a protocol-warn, since there's nothing relay operators can do
  3668. about a client that sends them a malformed create cell. Resolves
  3669. bug 12996; bugfix on 0.0.6rc1.
  3670. - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
  3671. cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
  3672. - When logging information about an EXTEND2 or EXTENDED2 cell, log
  3673. their names correctly. Fixes part of bug 12700; bugfix
  3674. on
  3675. - When logging information about a relay cell whose command we don't
  3676. recognize, log its command as an integer. Fixes part of bug 12700;
  3677. bugfix on
  3678. - Escape all strings from the directory connection before logging
  3679. them. Fixes bug 13071; bugfix on Patch from "teor".
  3680. - Squelch a spurious LD_BUG message "No origin circuit for
  3681. successful SOCKS stream" in certain hidden service failure cases;
  3682. fixes bug 10616.
  3683. - Downgrade the severity of the 'unexpected sendme cell from client'
  3684. from 'warn' to 'protocol warning'. Closes ticket 8093.
  3685. o Minor bugfixes (misc code correctness):
  3686. - In munge_extrainfo_into_routerinfo(), check the return value of
  3687. memchr(). This would have been a serious issue if we ever passed
  3688. it a non-extrainfo. Fixes bug 8791; bugfix on Patch
  3689. from Arlo Breault.
  3690. - On the chance that somebody manages to build Tor on a
  3691. platform where time_t is unsigned, correct the way that
  3692. microdesc_add_to_cache() handles negative time arguments.
  3693. Fixes bug 8042; bugfix on
  3694. - Fix various instances of undefined behavior in channeltls.c,
  3695. tor_memmem(), and eventdns.c that would cause us to construct
  3696. pointers to memory outside an allocated object. (These invalid
  3697. pointers were not accessed, but C does not even allow them to
  3698. exist.) Fixes bug 10363; bugfixes on,,
  3699., and Reported by "bobnomnom".
  3700. - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
  3701. fix some miscellaneous errors in our tests and codebase. Fixes bug
  3702. 11232. Bugfixes on versions back as far as
  3703. - Always check return values for unlink, munmap, UnmapViewOfFile;
  3704. check strftime return values more often. In some cases all we can
  3705. do is report a warning, but this may help prevent deeper bugs from
  3706. going unnoticed. Closes ticket 8787; bugfixes on many, many tor
  3707. versions.
  3708. - Fix numerous warnings from the clang "scan-build" static analyzer.
  3709. Some of these are programming style issues; some of them are false
  3710. positives that indicated awkward code; some are undefined behavior
  3711. cases related to constructing (but not using) invalid pointers;
  3712. some are assumptions about API behavior; some are (harmlessly)
  3713. logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
  3714. correct; and one or two are genuine bugs that weren't reachable
  3715. from the rest of the program. Fixes bug 8793; bugfixes on many,
  3716. many tor versions.
  3717. o Minor bugfixes (node selection):
  3718. - If ExcludeNodes is set, consider non-excluded hidden service
  3719. directory servers before excluded ones. Do not consider excluded
  3720. hidden service directory servers at all if StrictNodes is
  3721. set. (Previously, we would sometimes decide to connect to those
  3722. servers, and then realize before we initiated a connection that
  3723. we had excluded them.) Fixes bug 10722; bugfix on
  3724. Reported by "mr-4".
  3725. - If we set the ExitNodes option but it doesn't include any nodes
  3726. that have the Exit flag, we would choose not to bootstrap. Now we
  3727. bootstrap so long as ExitNodes includes nodes which can exit to
  3728. some port. Fixes bug 10543; bugfix on
  3729. o Minor bugfixes (performance):
  3730. - Avoid a bug where every successful connection made us recompute
  3731. the flag telling us whether we have sufficient information to
  3732. build circuits. Previously, we would forget our cached value
  3733. whenever we successfully opened a channel (or marked a router as
  3734. running or not running for any other reason), regardless of
  3735. whether we had previously believed the router to be running. This
  3736. forced us to run an expensive update operation far too often.
  3737. Fixes bug 12170; bugfix on
  3738. - Avoid using tor_memeq() for checking relay cell integrity. This
  3739. removes a possible performance bottleneck. Fixes part of bug
  3740. 12169; bugfix on
  3741. o Minor bugfixes (platform-specific):
  3742. - When dumping a malformed directory object to disk, save it in
  3743. binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
  3745. - Don't report failures from make_socket_reuseable() on incoming
  3746. sockets on OSX: this can happen when incoming connections close
  3747. early. Fixes bug 10081.
  3748. o Minor bugfixes (pluggable transports):
  3749. - Avoid another 60-second delay when starting Tor in a pluggable-
  3750. transport-using configuration when we already have cached
  3751. descriptors for our bridges. Fixes bug 11965; bugfix
  3752. on
  3753. o Minor bugfixes (protocol correctness):
  3754. - When receiving a VERSIONS cell with an odd number of bytes, close
  3755. the connection immediately since the cell is malformed. Fixes bug
  3756. 10365; bugfix on Spotted by "bobnomnom"; fix by
  3757. "rl1987".
  3758. o Minor bugfixes (relay, other):
  3759. - We now drop CREATE cells for already-existent circuit IDs and for
  3760. zero-valued circuit IDs, regardless of other factors that might
  3761. otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
  3762. on 0.0.8pre1.
  3763. - When rejecting DATA cells for stream_id zero, still count them
  3764. against the circuit's deliver window so that we don't fail to send
  3765. a SENDME. Fixes bug 11246; bugfix on
  3766. o Minor bugfixes (relay, threading):
  3767. - Check return code on spawn_func() in cpuworker code, so that we
  3768. don't think we've spawned a nonworking cpuworker and write junk to
  3769. it forever. Fix related to bug 4345; bugfix on all released Tor
  3770. versions. Found by "skruffy".
  3771. - Use a pthread_attr to make sure that spawn_func() cannot return an
  3772. error while at the same time launching a thread. Fix related to
  3773. bug 4345; bugfix on all released Tor versions. Reported
  3774. by "cypherpunks".
  3775. o Minor bugfixes (relays and bridges):
  3776. - Avoid crashing on a malformed resolv.conf file when running a
  3777. relay using Libevent 1. Fixes bug 8788; bugfix on
  3778. - Non-exit relays no longer launch mock DNS requests to check for
  3779. DNS hijacking. This has been unnecessary since, when
  3780. non-exit relays stopped servicing DNS requests. Fixes bug 965;
  3781. bugfix on Patch from Matt Pagan.
  3782. - Bridges now report complete directory request statistics. Related
  3783. to bug 5824; bugfix on
  3784. - Bridges now never collect statistics that were designed for
  3785. relays. Fixes bug 5824; bugfix on
  3786. o Minor bugfixes (testing):
  3787. - Fix all valgrind warnings produced by the unit tests. There were
  3788. over a thousand memory leak warnings previously, mostly produced
  3789. by forgetting to free things in the unit test code. Fixes bug
  3790. 11618, bugfixes on many versions of Tor.
  3791. o Minor bugfixes (tor-fw-helper):
  3792. - Give a correct log message when tor-fw-helper fails to launch.
  3793. (Previously, we would say something like "tor-fw-helper sent us a
  3794. string we could not parse".) Fixes bug 9781; bugfix
  3795. on
  3796. o Minor bugfixes (trivial memory leaks):
  3797. - Fix a small memory leak when signing a directory object. Fixes bug
  3798. 11275; bugfix on
  3799. - Resolve some memory leaks found by coverity in the unit tests, on
  3800. exit in tor-gencert, and on a failure to compute digests for our
  3801. own keys when generating a v3 networkstatus vote. These leaks
  3802. should never have affected anyone in practice.
  3803. o Code simplification and refactoring:
  3804. - Remove some old fallback code designed to keep Tor clients working
  3805. in a network with only two working relays. Elsewhere in the code we
  3806. have long since stopped supporting such networks, so there wasn't
  3807. much point in keeping it around. Addresses ticket 9926.
  3808. - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
  3809. bugfix on Reported by "cypherpunks".
  3810. - Extract the common duplicated code for creating a subdirectory
  3811. of the data directory and writing to a file in it. Fixes ticket
  3812. 4282; patch from Peter Retzlaff.
  3813. - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
  3814. buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
  3815. i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
  3816. - Add a set of accessor functions for the circuit timeout data
  3817. structure. Fixes ticket 6153; patch from "piet".
  3818. - Clean up exit paths from connection_listener_new(). Closes ticket
  3819. 8789. Patch from Arlo Breault.
  3820. - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
  3821. and drop our own custom pkey_eq() implementation. Fixes bug 9043.
  3822. - Use a doubly-linked list to implement the global circuit list.
  3823. Resolves ticket 9108. Patch from Marek Majkowski.
  3824. - Remove contrib/id_to_fp.c since it wasn't used anywhere.
  3825. - Remove constants and tests for PKCS1 padding; it's insecure and
  3826. shouldn't be used for anything new. Fixes bug 8792; patch
  3827. from Arlo Breault.
  3828. - Remove instances of strcpy() from the unit tests. They weren't
  3829. hurting anything, since they were only in the unit tests, but it's
  3830. embarassing to have strcpy() in the code at all, and some analysis
  3831. tools don't like it. Fixes bug 8790; bugfix on and
  3832. Patch from Arlo Breault.
  3833. - Remove is_internal_IP() function. Resolves ticket 4645.
  3834. - Remove unused function circuit_dump_by_chan from circuitlist.c.
  3835. Closes issue 9107; patch from "marek".
  3836. - Change our use of the ENUM_BF macro to avoid declarations that
  3837. confuse Doxygen.
  3838. - Get rid of router->address, since in all cases it was just the
  3839. string representation of router->addr. Resolves ticket 5528.
  3840. o Documentation:
  3841. - Adjust the URLs in the README to refer to the new locations of
  3842. several documents on the website. Fixes bug 12830. Patch from
  3843. Matt Pagan.
  3844. - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
  3845. ticket 12878.
  3846. - Update manpage to describe some of the files you can expect to
  3847. find in Tor's DataDirectory. Addresses ticket 9839.
  3848. - Clean up several option names in the manpage to match their real
  3849. names, add the missing documentation for a couple of testing and
  3850. directory authority options, remove the documentation for a
  3851. V2-directory fetching option that no longer exists. Resolves
  3852. ticket 11634.
  3853. - Correct the documenation so that it lists the correct directory
  3854. for the stats files. (They are in a subdirectory called "stats",
  3855. not "status".)
  3856. - In the manpage, move more authority-only options into the
  3857. directory authority section so that operators of regular directory
  3858. caches don't get confused.
  3859. - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
  3860. 11061; bugfix on
  3861. - Resolve warnings from Doxygen.
  3862. - Document in the manpage that "KBytes" may also be written as
  3863. "kilobytes" or "KB", that "Kbits" may also be written as
  3864. "kilobits", and so forth. Closes ticket 9222.
  3865. - Document that the ClientOnly config option overrides ORPort.
  3866. Our old explanation made ClientOnly sound as though it did
  3867. nothing at all. Resolves bug 9059.
  3868. - Explain that SocksPolicy, DirPolicy, and similar options don't
  3869. take port arguments. Fixes the other part of ticket 11108.
  3870. - Fix a comment about the rend_server_descriptor_t.protocols field
  3871. to more accurately describe its range. Also, make that field
  3872. unsigned, to more accurately reflect its usage. Fixes bug 9099;
  3873. bugfix on
  3874. - Fix the manpage's description of HiddenServiceAuthorizeClient:
  3875. the maximum client name length is 16, not 19. Fixes bug 11118;
  3876. bugfix on
  3877. o Package cleanup:
  3878. - The contrib directory has been sorted and tidied. Before, it was
  3879. an unsorted dumping ground for useful and not-so-useful things.
  3880. Now, it is divided based on functionality, and the items which
  3881. seemed to be nonfunctional or useless have been removed. Resolves
  3882. ticket 8966; based on patches from "rl1987".
  3883. o Removed code and features:
  3884. - Clients now reject any directory authority certificates lacking
  3885. a dir-key-crosscert element. These have been included since
  3886., so there's no real reason for them to be optional
  3887. any longer. Completes proposal 157. Resolves ticket 10162.
  3888. - Remove all code that existed to support the v2 directory system,
  3889. since there are no longer any v2 directory authorities. Resolves
  3890. ticket 10758.
  3891. - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
  3892. options, which were used for designating authorities as "Hidden
  3893. service authorities". There has been no use of hidden service
  3894. authorities since, when we stopped uploading or
  3895. downloading v0 hidden service descriptors. Fixes bug 10881; also
  3896. part of a fix for bug 10841.
  3897. - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
  3898. and MTBF calculations, but that nobody was using. Fixes bug 11742.
  3899. - The TunnelDirConns and PreferTunnelledDirConns options no longer
  3900. exist; tunneled directory connections have been available since
  3901., and turning them off is not a good idea. This is a
  3902. brute-force fix for 10849, where "TunnelDirConns 0" would break
  3903. hidden services.
  3904. - Remove all code for the long unused v1 directory protocol.
  3905. Resolves ticket 11070.
  3906. - Remove all remaining code related to version-0 hidden service
  3907. descriptors: they have not been in use since Fixes
  3908. the rest of bug 10841.
  3909. - Remove migration code from when we renamed the "cached-routers"
  3910. file to "cached-descriptors" back in This
  3911. incidentally resolves ticket 6502 by cleaning up the related code
  3912. a bit. Patch from Akshay Hebbar.
  3913. o Test infrastructure:
  3914. - Tor now builds each source file in two modes: a mode that avoids
  3915. exposing identifiers needlessly, and another mode that exposes
  3916. more identifiers for testing. This lets the compiler do better at
  3917. optimizing the production code, while enabling us to take more
  3918. radical measures to let the unit tests test things.
  3919. - The production builds no longer include functions used only in
  3920. the unit tests; all functions exposed from a module only for
  3921. unit-testing are now static in production builds.
  3922. - Add an --enable-coverage configuration option to make the unit
  3923. tests (and a new src/or/tor-cov target) to build with gcov test
  3924. coverage support.
  3925. - Update to the latest version of tinytest.
  3926. - Improve the tinytest implementation of string operation tests so
  3927. that comparisons with NULL strings no longer crash the tests; they
  3928. now just fail, normally. Fixes bug 9004; bugfix on
  3929. - New macros in test.h to simplify writing mock-functions for unit
  3930. tests. Part of ticket 11507. Patch from Dana Koch.
  3931. - We now have rudimentary function mocking support that our unit
  3932. tests can use to test functions in isolation. Function mocking
  3933. lets the tests temporarily replace a function's dependencies with
  3934. stub functions, so that the tests can check the function without
  3935. invoking the other functions it calls.
  3936. o Testing:
  3937. - Complete tests for the status.c module. Resolves ticket 11507.
  3938. Patch from Dana Koch.
  3939. - Add more unit tests for the <circid,channel>->circuit map, and
  3940. the destroy-cell-tracking code to fix bug 7912.
  3941. - Unit tests for failing cases of the TAP onion handshake.
  3942. - More unit tests for address-manipulation functions.
  3943. o Distribution (systemd):
  3944. - Include a tor.service file in contrib/dist for use with systemd.
  3945. Some distributions will be able to use this file unmodified;
  3946. others will need to tweak it, or write their own. Patch from Jamie
  3947. Nguyen; resolves ticket 8368.
  3948. - Verify configuration file via ExecStartPre in the systemd unit
  3949. file. Patch from intrigeri; resolves ticket 12730.
  3950. - Explicitly disable RunAsDaemon in the systemd unit file. Our
  3951. current systemd unit uses "Type = simple", so systemd does not
  3952. expect tor to fork. If the user has "RunAsDaemon 1" in their
  3953. torrc, then things won't work as expected. This is e.g. the case
  3954. on Debian (and derivatives), since there we pass "--defaults-torrc
  3955. /usr/share/tor/tor-service-defaults-torrc" (that contains
  3956. "RunAsDaemon 1") by default. Patch by intrigeri; resolves
  3957. ticket 12731.
  3958. Changes in version - 2014-10-20
  3959. Tor disables SSL3 in response to the recent "POODLE" attack
  3960. (even though POODLE does not affect Tor). It also works around a crash
  3961. bug caused by some operating systems' response to the "POODLE" attack
  3962. (which does affect Tor).
  3963. o Major security fixes (also in
  3964. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  3965. today support TLS 1.0 or later, so we can safely turn off support
  3966. for this old (and insecure) protocol. Fixes bug 13426.
  3967. o Major bugfixes (openssl bug workaround, also in
  3968. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  3969. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  3970. 13471. This is a workaround for an OpenSSL bug.
  3971. Changes in version - 2014-09-22
  3972. Tor fixes a bug that affects consistency and speed when
  3973. connecting to hidden services, and it updates the location of one of
  3974. the directory authorities.
  3975. o Major bugfixes:
  3976. - Clients now send the correct address for their chosen rendezvous
  3977. point when trying to access a hidden service. They used to send
  3978. the wrong address, which would still work some of the time because
  3979. they also sent the identity digest of the rendezvous point, and if
  3980. the hidden service happened to try connecting to the rendezvous
  3981. point from a relay that already had a connection open to it,
  3982. the relay would reuse that connection. Now connections to hidden
  3983. services should be more robust and faster. Also, this bug meant
  3984. that clients were leaking to the hidden service whether they were
  3985. on a little-endian (common) or big-endian (rare) system, which for
  3986. some users might have reduced their anonymity. Fixes bug 13151;
  3987. bugfix on
  3988. o Directory authority changes:
  3989. - Change IP address for gabelmoo (v3 directory authority).
  3990. o Minor features (geoip):
  3991. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  3992. Country database.
  3993. Changes in version - 2014-07-28
  3994. Tor brings us a big step closer to slowing down the risk from
  3995. guard rotation, and also backports several important fixes from the
  3996. Tor 0.2.5 alpha release series.
  3997. o Major features:
  3998. - Clients now look at the "usecreatefast" consensus parameter to
  3999. decide whether to use CREATE_FAST or CREATE cells for the first hop
  4000. of their circuit. This approach can improve security on connections
  4001. where Tor's circuit handshake is stronger than the available TLS
  4002. connection security levels, but the tradeoff is more computational
  4003. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  4004. - Make the number of entry guards configurable via a new
  4005. NumEntryGuards consensus parameter, and the number of directory
  4006. guards configurable via a new NumDirectoryGuards consensus
  4007. parameter. Implements ticket 12688.
  4008. o Major bugfixes:
  4009. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  4010. implementation that caused incorrect results on 32-bit
  4011. implementations when certain malformed inputs were used along with
  4012. a small class of private ntor keys. This bug does not currently
  4013. appear to allow an attacker to learn private keys or impersonate a
  4014. Tor server, but it could provide a means to distinguish 32-bit Tor
  4015. implementations from 64-bit Tor implementations. Fixes bug 12694;
  4016. bugfix on Bug found by Robert Ransom; fix from
  4017. Adam Langley.
  4018. o Minor bugfixes:
  4019. - Warn and drop the circuit if we receive an inbound 'relay early'
  4020. cell. Those used to be normal to receive on hidden service circuits
  4021. due to bug 1038, but the buggy Tor versions are long gone from
  4022. the network so we can afford to resume watching for them. Resolves
  4023. the rest of bug 1038; bugfix on
  4024. - Correct a confusing error message when trying to extend a circuit
  4025. via the control protocol but we don't know a descriptor or
  4026. microdescriptor for one of the specified relays. Fixes bug 12718;
  4027. bugfix on
  4028. - Avoid an illegal read from stack when initializing the TLS
  4029. module using a version of OpenSSL without all of the ciphers
  4030. used by the v2 link handshake. Fixes bug 12227; bugfix on
  4031. Found by "starlight".
  4032. o Minor features:
  4033. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  4034. Country database.
  4035. Changes in version - 2014-05-16
  4036. Tor backports numerous high-priority fixes from the Tor 0.2.5
  4037. alpha release series. These include blocking all authority signing
  4038. keys that may have been affected by the OpenSSL "heartbleed" bug,
  4039. choosing a far more secure set of TLS ciphersuites by default, closing
  4040. a couple of memory leaks that could be used to run a target relay out
  4041. of RAM, and several others.
  4042. o Major features (security, backport from
  4043. - Block authority signing keys that were used on authorities
  4044. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  4045. don't have any evidence that these keys _were_ compromised; we're
  4046. doing this to be prudent.) Resolves ticket 11464.
  4047. o Major bugfixes (security, OOM):
  4048. - Fix a memory leak that could occur if a microdescriptor parse
  4049. fails during the tokenizing step. This bug could enable a memory
  4050. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  4051. on
  4052. o Major bugfixes (TLS cipher selection, backport from
  4053. - The relay ciphersuite list is now generated automatically based on
  4054. uniform criteria, and includes all OpenSSL ciphersuites with
  4055. acceptable strength and forward secrecy. Previously, we had left
  4056. some perfectly fine ciphersuites unsupported due to omission or
  4057. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  4058. 'cypherpunks'. Bugfix on
  4059. - Relays now trust themselves to have a better view than clients of
  4060. which TLS ciphersuites are better than others. (Thanks to bug
  4061. 11513, the relay list is now well-considered, whereas the client
  4062. list has been chosen mainly for anti-fingerprinting purposes.)
  4063. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  4064. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  4065. AES128. Resolves ticket 11528.
  4066. - Clients now try to advertise the same list of ciphersuites as
  4067. Firefox 28. This change enables selection of (fast) GCM
  4068. ciphersuites, disables some strange old ciphers, and stops
  4069. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  4070. Resolves ticket 11438.
  4071. o Minor bugfixes (configuration, security):
  4072. - When running a hidden service, do not allow TunneledDirConns 0:
  4073. trying to set that option together with a hidden service would
  4074. otherwise prevent the hidden service from running, and also make
  4075. it publish its descriptors directly over HTTP. Fixes bug 10849;
  4076. bugfix on
  4077. o Minor bugfixes (controller, backport from
  4078. - Avoid sending a garbage value to the controller when a circuit is
  4079. cannibalized. Fixes bug 11519; bugfix on
  4080. o Minor bugfixes (exit relay, backport from
  4081. - Stop leaking memory when we successfully resolve a PTR record.
  4082. Fixes bug 11437; bugfix on
  4083. o Minor bugfixes (bridge client, backport from
  4084. - Avoid 60-second delays in the bootstrapping process when Tor is
  4085. launching for a second time while using bridges. Fixes bug 9229;
  4086. bugfix on
  4087. o Minor bugfixes (relays and bridges, backport from
  4088. - Give the correct URL in the warning message when trying to run a
  4089. relay on an ancient version of Windows. Fixes bug 9393.
  4090. o Minor bugfixes (compilation):
  4091. - Fix a compilation error when compiling with --disable-curve25519.
  4092. Fixes bug 9700; bugfix on
  4093. o Minor bugfixes:
  4094. - Downgrade the warning severity for the the "md was still
  4095. referenced 1 node(s)" warning. Tor has better code
  4096. for trying to diagnose this bug, and the current warning in
  4097. earlier versions of tor achieves nothing useful. Addresses warning
  4098. from bug 7164.
  4099. o Minor features (log verbosity, backport from
  4100. - When we run out of usable circuit IDs on a channel, log only one
  4101. warning for the whole channel, and describe how many circuits
  4102. there were on the channel. Fixes part of ticket 11553.
  4103. o Minor features (security, backport from
  4104. - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
  4105. leave the default at 8GBytes), to better support Raspberry Pi
  4106. users. Fixes bug 9686; bugfix on
  4107. o Documentation (backport from
  4108. - Correctly document that we search for a system torrc file before
  4109. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  4111. Changes in version - 2014-02-28
  4112. Tor further improves security against potential adversaries who
  4113. find breaking 1024-bit crypto doable, and backports several stability
  4114. and robustness patches from the 0.2.5 branch.
  4115. o Major features (client security):
  4116. - When we choose a path for a 3-hop circuit, make sure it contains
  4117. at least one relay that supports the NTor circuit extension
  4118. handshake. Otherwise, there is a chance that we're building
  4119. a circuit that's worth attacking by an adversary who finds
  4120. breaking 1024-bit crypto doable, and that chance changes the game
  4121. theory. Implements ticket 9777.
  4122. o Major bugfixes:
  4123. - Do not treat streams that fail with reason
  4124. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  4125. since it could also indicate an ENETUNREACH connection error. Fixes
  4126. part of bug 10777; bugfix on
  4127. o Code simplification and refactoring:
  4128. - Remove data structures which were introduced to implement the
  4129. CellStatistics option: they are now redundant with the new timestamp
  4130. field in the regular packed_cell_t data structure, which we did
  4131. in in order to resolve bug 9093. Resolves ticket 10870.
  4132. o Minor features:
  4133. - Always clear OpenSSL bignums before freeing them -- even bignums
  4134. that don't contain secrets. Resolves ticket 10793. Patch by
  4135. Florent Daigniere.
  4136. - Build without warnings under clang 3.4. (We have some macros that
  4137. define static functions only some of which will get used later in
  4138. the module. Starting with clang 3.4, these give a warning unless the
  4139. unused attribute is set on them.) Resolves ticket 10904.
  4140. - Update geoip and geoip6 files to the February 7 2014 Maxmind
  4141. GeoLite2 Country database.
  4142. o Minor bugfixes:
  4143. - Set the listen() backlog limit to the largest actually supported
  4144. on the system, not to the value in a header file. Fixes bug 9716;
  4145. bugfix on every released Tor.
  4146. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  4147. exit node as a NOROUTE error, not an INTERNAL error, since they
  4148. can apparently happen when trying to connect to the wrong sort
  4149. of netblocks. Fixes part of bug 10777; bugfix on
  4150. - Fix build warnings about missing "a2x" comment when building the
  4151. manpages from scratch on OpenBSD; OpenBSD calls it "".
  4152. Fixes bug 10929; bugfix on Patch from Dana Koch.
  4153. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  4154. not entirely remove it from the connection lists. Fixes bug 9602;
  4155. bugfix on
  4156. - Fix a segmentation fault in our benchmark code when running with
  4157. Fedora's OpenSSL package, or any other OpenSSL that provides
  4158. ECDH but not P224. Fixes bug 10835; bugfix on
  4159. - Turn "circuit handshake stats since last time" log messages into a
  4160. heartbeat message. Fixes bug 10485; bugfix on
  4161. o Documentation fixes:
  4162. - Document that all but one DirPort entry must have the NoAdvertise
  4163. flag set. Fixes bug 10470; bugfix on /
  4164. Changes in version - 2013-12-22
  4165. Tor fixes potentially poor random number generation for users
  4166. who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
  4167. torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
  4168. and 4) have no state file in their DataDirectory (as would happen on
  4169. first start). Users who generated relay or hidden service identity
  4170. keys in such a situation should discard them and generate new ones.
  4171. This release also fixes a logic error that caused Tor clients to build
  4172. many more preemptive circuits than they actually need.
  4173. o Major bugfixes:
  4174. - Do not allow OpenSSL engines to replace the PRNG, even when
  4175. HardwareAccel is set. The only default builtin PRNG engine uses
  4176. the Intel RDRAND instruction to replace the entire PRNG, and
  4177. ignores all attempts to seed it with more entropy. That's
  4178. cryptographically stupid: the right response to a new alleged
  4179. entropy source is never to discard all previously used entropy
  4180. sources. Fixes bug 10402; works around behavior introduced in
  4181. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  4182. and "rl1987".
  4183. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  4184. address. Fixes bug 10465; bugfix on
  4185. - Avoid launching spurious extra circuits when a stream is pending.
  4186. This fixes a bug where any circuit that _wasn't_ unusable for new
  4187. streams would be treated as if it were, causing extra circuits to
  4188. be launched. Fixes bug 10456; bugfix on
  4189. o Minor bugfixes:
  4190. - Avoid a crash bug when starting with a corrupted microdescriptor
  4191. cache file. Fixes bug 10406; bugfix on
  4192. - If we fail to dump a previously cached microdescriptor to disk, avoid
  4193. freeing duplicate data later on. Fixes bug 10423; bugfix on
  4194. Spotted by "bobnomnom".
  4195. Changes in version - 2013-12-11
  4196. The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
  4197. (1986-2013). Aaron worked on diverse projects including helping to guide
  4198. Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
  4199. transparency to the U.S government's PACER documents, and contributing
  4200. design and development for Tor and Tor2Web. Aaron was one of the latest
  4201. martyrs in our collective fight for civil liberties and human rights,
  4202. and his death is all the more painful because he was one of us.
  4203. Tor, the first stable release in the 0.2.4 branch, features
  4204. a new circuit handshake and link encryption that use ECC to provide
  4205. better security and efficiency; makes relays better manage circuit
  4206. creation requests; uses "directory guards" to reduce client enumeration
  4207. risks; makes bridges collect and report statistics about the pluggable
  4208. transports they support; cleans up and improves our geoip database;
  4209. gets much closer to IPv6 support for clients, bridges, and relays; makes
  4210. directory authorities use measured bandwidths rather than advertised
  4211. ones when computing flags and thresholds; disables client-side DNS
  4212. caching to reduce tracking risks; and fixes a big bug in bridge
  4213. reachability testing. This release introduces two new design
  4214. abstractions in the code: a new "channel" abstraction between circuits
  4215. and or_connections to allow for implementing alternate relay-to-relay
  4216. transports, and a new "circuitmux" abstraction storing the queue of
  4217. circuits for a channel. The release also includes many stability,
  4218. security, and privacy fixes.
  4219. o Major features (new circuit handshake):
  4220. - Tor now supports a new circuit extension handshake designed by Ian
  4221. Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
  4222. circuit extension handshake, later called "TAP", was a bit slow
  4223. (especially on the relay side), had a fragile security proof, and
  4224. used weaker keys than we'd now prefer. The new circuit handshake
  4225. uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
  4226. function, making it significantly more secure than the older
  4227. handshake, and significantly faster. Tor can use one of two built-in
  4228. pure-C curve25519-donna implementations by Adam Langley, or it
  4229. can link against the "nacl" library for a tuned version if present.
  4230. The built-in version is very fast for 64-bit systems when building
  4231. with GCC. The built-in 32-bit version is still faster than the
  4232. old TAP protocol, but using libnacl is better on most such hosts.
  4233. Implements proposal 216; closes ticket 7202.
  4234. o Major features (better link encryption):
  4235. - Relays can now enable the ECDHE TLS ciphersuites when available
  4236. and appropriate. These ciphersuites let us negotiate forward-secure
  4237. TLS secret keys more safely and more efficiently than with our
  4238. previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
  4239. public relays prefer the (faster) P224 group, and bridges prefer
  4240. the (more common) P256 group; you can override this with the
  4241. TLSECGroup option.
  4242. This feature requires clients running or later,
  4243. and requires both sides to be running OpenSSL 1.0.0 or later
  4244. with ECC support. OpenSSL 1.0.1, with the compile-time option
  4245. "enable-ec_nistp_64_gcc_128", is highly recommended.
  4246. Implements the relay side of proposal 198; closes ticket 7200.
  4247. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  4248. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  4249. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  4250. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  4251. them to solve bug 6033.)
  4252. o Major features (relay performance):
  4253. - Instead of limiting the number of queued onionskins (aka circuit
  4254. create requests) to a fixed, hard-to-configure number, we limit
  4255. the size of the queue based on how many we expect to be able to
  4256. process in a given amount of time. We estimate the time it will
  4257. take to process an onionskin based on average processing time
  4258. of previous onionskins. Closes ticket 7291. You'll never have to
  4259. configure MaxOnionsPending again.
  4260. - Relays process the new "NTor" circuit-level handshake requests
  4261. with higher priority than the old "TAP" circuit-level handshake
  4262. requests. We still process some TAP requests to not totally starve
  4263. 0.2.3 clients when NTor becomes popular. A new consensus parameter
  4264. "NumNTorsPerTAP" lets us tune the balance later if we need to.
  4265. Implements ticket 9574.
  4266. o Major features (client bootstrapping resilience):
  4267. - Add a new "FallbackDir" torrc option to use when we can't use
  4268. a directory mirror from the consensus (either because we lack a
  4269. consensus, or because they're all down). Currently, all authorities
  4270. are fallbacks by default, and there are no other default fallbacks,
  4271. but that will change. This option will allow us to give clients a
  4272. longer list of servers to try to get a consensus from when first
  4273. connecting to the Tor network, and thereby reduce load on the
  4274. directory authorities. Implements proposal 206, "Preconfigured
  4275. directory sources for bootstrapping". We also removed the old
  4276. "FallbackNetworkstatus" option, since we never got it working well
  4277. enough to use it. Closes bug 572.
  4278. - If we have no circuits open, use a relaxed timeout (the
  4279. 95th-percentile cutoff) until a circuit succeeds. This heuristic
  4280. should allow Tor to succeed at building circuits even when the
  4281. network connection drastically changes. Should help with bug 3443.
  4282. o Major features (use of guards):
  4283. - Support directory guards (proposal 207): when possible, clients now
  4284. use their entry guards for non-anonymous directory requests. This
  4285. can help prevent client enumeration. Note that this behavior only
  4286. works when we have a usable consensus directory, and when options
  4287. about what to download are more or less standard. In the future we
  4288. should re-bootstrap from our guards, rather than re-bootstrapping
  4289. from the preconfigured list of directory sources that ships with
  4290. Tor. Resolves ticket 6526.
  4291. - Raise the default time that a client keeps an entry guard from
  4292. "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
  4293. 2012 paper. (We would make it even longer, but we need better client
  4294. load balancing first.) Also, make the guard lifetime controllable
  4295. via a new GuardLifetime torrc option and a GuardLifetime consensus
  4296. parameter. Start of a fix for bug 8240; bugfix on
  4297. o Major features (bridges with pluggable transports):
  4298. - Bridges now report the pluggable transports they support to the
  4299. bridge authority, so it can pass the supported transports on to
  4300. bridgedb and/or eventually do reachability testing. Implements
  4301. ticket 3589.
  4302. - Automatically forward the TCP ports of pluggable transport
  4303. proxies using tor-fw-helper if PortForwarding is enabled. Implements
  4304. ticket 4567.
  4305. o Major features (geoip database):
  4306. - Maxmind began labelling Tor relays as being in country "A1",
  4307. which breaks by-country node selection inside Tor. Now we use a
  4308. script to replace "A1" ("Anonymous Proxy") entries in our geoip
  4309. file with real country codes. This script fixes about 90% of "A1"
  4310. entries automatically and uses manual country code assignments to
  4311. fix the remaining 10%. See src/config/README.geoip for details.
  4312. Fixes bug 6266.
  4313. - Add GeoIP database for IPv6 addresses. The new config option
  4314. is GeoIPv6File.
  4315. - Update to the October 2 2013 Maxmind GeoLite Country database.
  4316. o Major features (IPv6):
  4317. - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
  4318. IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
  4319. to happen. Implements ticket 5535.
  4320. - All kind of relays, not just bridges, can now advertise an IPv6
  4321. OR port. Implements ticket 6362.
  4322. - Relays can now exit to IPv6 addresses: make sure that you have IPv6
  4323. connectivity, then set the IPv6Exit flag to 1. Also make sure your
  4324. exit policy reads as you would like: the address * applies to all
  4325. address families, whereas *4 is IPv4 address only, and *6 is IPv6
  4326. addresses only. On the client side, you'll need to wait for enough
  4327. exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
  4328. and use Socks5. Closes ticket 5547, implements proposal 117 as
  4329. revised in proposal 208.
  4330. - Bridge authorities now accept IPv6 bridge addresses and include
  4331. them in network status documents. Implements ticket 5534.
  4332. - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
  4333. o Major features (directory authorities):
  4334. - Directory authorities now prefer using measured bandwidths to
  4335. advertised ones when computing flags and thresholds. Resolves
  4336. ticket 8273.
  4337. - Directory authorities that vote measured bandwidths about more
  4338. than a threshold number of relays now treat relays with
  4339. unmeasured bandwidths as having bandwidth 0 when computing their
  4340. flags. Resolves ticket 8435.
  4341. - Directory authorities now support a new consensus method (17)
  4342. where they cap the published bandwidth of relays for which
  4343. insufficient bandwidth measurements exist. Fixes part of bug 2286.
  4344. - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
  4345. serve any v2 directory information. Now we can test disabling the
  4346. old deprecated v2 directory format, and see whether doing so has
  4347. any effect on network load. Begins to fix bug 6783.
  4348. o Major features (build and portability):
  4349. - Switch to a nonrecursive Makefile structure. Now instead of each
  4350. invoking other's, there is a master
  4351. that includes the others. This change makes our build
  4352. process slightly more maintainable, and improves parallelism for
  4353. building with make -j. Original patch by Stewart Smith; various
  4354. fixes by Jim Meyering.
  4355. - Where available, we now use automake's "silent" make rules by
  4356. default, so that warnings are easier to spot. You can get the old
  4357. behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
  4358. - Resume building correctly with MSVC and Makefile.nmake. This patch
  4359. resolves numerous bugs and fixes reported by ultramage, including
  4360. 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
  4361. o Security features:
  4362. - Switch to a completely time-invariant approach for picking nodes
  4363. weighted by bandwidth. Our old approach would run through the
  4364. part of the loop after it had made its choice slightly slower
  4365. than it ran through the part of the loop before it had made its
  4366. choice. Addresses ticket 6538.
  4367. - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
  4368. by tor2web clients allows hidden services to identify tor2web
  4369. clients through their repeated selection of the same rendezvous
  4370. and introduction point circuit endpoints (their guards). Resolves
  4371. ticket 6888.
  4372. o Major bugfixes (relay denial of service):
  4373. - When we have too much memory queued in circuits (according to a new
  4374. MaxMemInCellQueues option), close the circuits that have the oldest
  4375. queued cells, on the theory that those are most responsible for
  4376. us running low on memory. This prevents us from running out of
  4377. memory as a relay if circuits fill up faster than they can be
  4378. drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
  4379. Tor. This bug is a further fix beyond bug 6252, whose fix was
  4380. merged into
  4381. - Reject bogus create and relay cells with 0 circuit ID or 0 stream
  4382. ID: these could be used to create unexpected streams and circuits
  4383. which would count as "present" to some parts of Tor but "absent"
  4384. to others, leading to zombie circuits and streams or to a bandwidth
  4385. denial-of-service. Fixes bug 7889; bugfix on every released version
  4386. of Tor. Reported by "oftc_must_be_destroyed".
  4387. - Avoid a bug where our response to TLS renegotiation under certain
  4388. network conditions could lead to a busy-loop, with 100% CPU
  4389. consumption. Fixes bug 5650; bugfix on
  4390. o Major bugfixes (asserts, crashes, leaks):
  4391. - Prevent the get_freelists() function from running off the end of
  4392. the list of freelists if it somehow gets an unrecognized
  4393. allocation. Fixes bug 8844; bugfix on Reported by
  4394. eugenis.
  4395. - Avoid a memory leak where we would leak a consensus body when we
  4396. find that a consensus which we couldn't previously verify due to
  4397. missing certificates is now verifiable. Fixes bug 8719; bugfix
  4398. on
  4399. - If we are unable to save a microdescriptor to the journal, do not
  4400. drop it from memory and then reattempt downloading it. Fixes bug
  4401. 9645; bugfix on
  4402. - Fix an assertion failure that would occur when disabling the
  4403. ORPort setting on a running Tor process while accounting was
  4404. enabled. Fixes bug 6979; bugfix on
  4405. - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
  4406. when an exit connection with optimistic data succeeds immediately
  4407. rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
  4409. - Fix a memory leak that would occur whenever a configuration
  4410. option changed. Fixes bug 8718; bugfix on
  4411. o Major bugfixes (relay rate limiting):
  4412. - When a TLS write is partially successful but incomplete, remember
  4413. that the flushed part has been flushed, and notice that bytes were
  4414. actually written. Reported and fixed pseudonymously. Fixes bug 7708;
  4415. bugfix on Tor
  4416. - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
  4417. to 1GB/1GB. The previous defaults were intended to be "basically
  4418. infinite", but it turns out they're now limiting our 100mbit+
  4419. relays and bridges. Fixes bug 6605; bugfix on (the
  4420. last time we raised it).
  4421. - No longer stop reading or writing on cpuworker connections when
  4422. our rate limiting buckets go empty. Now we should handle circuit
  4423. handshake requests more promptly. Resolves bug 9731.
  4424. o Major bugfixes (client-side privacy):
  4425. - When we mark a circuit as unusable for new circuits, have it
  4426. continue to be unusable for new circuits even if MaxCircuitDirtiness
  4427. is increased too much at the wrong time, or the system clock jumps
  4428. backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
  4429. - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
  4430. which have resolved to internal addresses") is set, apply that
  4431. rule to IPv6 as well. Fixes bug 8475; bugfix on
  4432. - When an exit relay rejects a stream with reason "exit policy", but
  4433. we only know an exit policy summary (e.g. from the microdesc
  4434. consensus) for it, do not mark the relay as useless for all exiting.
  4435. Instead, mark just the circuit as unsuitable for that particular
  4436. address. Fixes part of bug 7582; bugfix on
  4437. o Major bugfixes (stream isolation):
  4438. - Allow applications to get proper stream isolation with
  4439. IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
  4440. username/password authentication also offer "no authentication". Tor
  4441. had previously preferred "no authentication", so the applications
  4442. never actually sent Tor their auth details. Now Tor selects
  4443. username/password authentication if it's offered. You can disable
  4444. this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
  4445. bug 8117; bugfix on
  4446. - Follow the socks5 protocol when offering username/password
  4447. authentication. The fix for bug 8117 exposed this bug, and it
  4448. turns out real-world applications like Pidgin do care. Bugfix on
  4449.; fixes bug 8879.
  4450. o Major bugfixes (client circuit building):
  4451. - Alter circuit build timeout measurement to start at the point
  4452. where we begin the CREATE/CREATE_FAST step (as opposed to circuit
  4453. initialization). This should make our timeout measurements more
  4454. uniform. Previously, we were sometimes including ORconn setup time
  4455. in our circuit build time measurements. Should resolve bug 3443.
  4456. - If the circuit build timeout logic is disabled (via the consensus,
  4457. or because we are an authority), then don't build testing circuits.
  4458. Fixes bug 9657; bugfix on
  4459. o Major bugfixes (client-side DNS):
  4460. - Turn off the client-side DNS cache by default. Updating and using
  4461. the DNS cache is now configurable on a per-client-port
  4462. level. SOCKSPort, DNSPort, etc lines may now contain
  4463. {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
  4464. cache these types of DNS answers when we receive them from an
  4465. exit node in response to an application request on this port, and
  4466. {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
  4467. cached DNS answers of these types, we shouldn't use them. It's
  4468. potentially risky to use cached DNS answers at the client, since
  4469. doing so can indicate to one exit what answers we've gotten
  4470. for DNS lookups in the past. With IPv6, this becomes especially
  4471. problematic. Using cached DNS answers for requests on the same
  4472. circuit would present less linkability risk, since all traffic
  4473. on a circuit is already linkable, but it would also provide
  4474. little performance benefit: the exit node caches DNS replies
  4475. too. Implements a simplified version of Proposal 205. Implements
  4476. ticket 7570.
  4477. o Major bugfixes (hidden service privacy):
  4478. - Limit hidden service descriptors to at most ten introduction
  4479. points, to slow one kind of guard enumeration. Fixes bug 9002;
  4480. bugfix on
  4481. o Major bugfixes (directory fetching):
  4482. - If the time to download the next old-style networkstatus is in
  4483. the future, do not decline to consider whether to download the
  4484. next microdescriptor networkstatus. Fixes bug 9564; bugfix on
  4486. - We used to always request authority certificates by identity digest,
  4487. meaning we'd get the newest one even when we wanted one with a
  4488. different signing key. Then we would complain about being given
  4489. a certificate we already had, and never get the one we really
  4490. wanted. Now we use the "fp-sk/" resource as well as the "fp/"
  4491. resource to request the one we want. Fixes bug 5595; bugfix on
  4493. o Major bugfixes (bridge reachability):
  4494. - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
  4495. previously they did not, which prevented them from receiving
  4496. successful connections from relays for self-test or bandwidth
  4497. testing. Also, when a relay is extending a circuit to a bridge,
  4498. it needs to send a NETINFO cell, even when the bridge hasn't sent
  4499. an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on
  4500. o Major bugfixes (control interface):
  4501. - When receiving a new configuration file via the control port's
  4502. LOADCONF command, do not treat the defaults file as absent.
  4503. Fixes bug 9122; bugfix on
  4504. o Major bugfixes (directory authorities):
  4505. - Stop marking every relay as having been down for one hour every
  4506. time we restart a directory authority. These artificial downtimes
  4507. were messing with our Stable and Guard flag calculations. Fixes
  4508. bug 8218 (introduced by the fix for 1035). Bugfix on
  4509. - When computing directory thresholds, ignore any rejected-as-sybil
  4510. nodes during the computation so that they can't influence Fast,
  4511. Guard, etc. (We should have done this for proposal 109.) Fixes
  4512. bug 8146.
  4513. - When marking a node as a likely sybil, reset its uptime metrics
  4514. to zero, so that it cannot time towards getting marked as Guard,
  4515. Stable, or HSDir. (We should have done this for proposal 109.) Fixes
  4516. bug 8147.
  4517. - Fix a bug in the voting algorithm that could yield incorrect results
  4518. when a non-naming authority declared too many flags. Fixes bug 9200;
  4519. bugfix on
  4520. o Internal abstraction features:
  4521. - Introduce new channel_t abstraction between circuits and
  4522. or_connection_t to allow for implementing alternate OR-to-OR
  4523. transports. A channel_t is an abstract object which can either be a
  4524. cell-bearing channel, which is responsible for authenticating and
  4525. handshaking with the remote OR and transmitting cells to and from
  4526. it, or a listening channel, which spawns new cell-bearing channels
  4527. at the request of remote ORs. Implements part of ticket 6465.
  4528. - Make a channel_tls_t subclass of channel_t, adapting it to the
  4529. existing or_connection_t code. The V2/V3 protocol handshaking
  4530. code which formerly resided in command.c has been moved below the
  4531. channel_t abstraction layer and may be found in channeltls.c now.
  4532. Implements the rest of ticket 6465.
  4533. - Introduce new circuitmux_t storing the queue of circuits for
  4534. a channel; this encapsulates and abstracts the queue logic and
  4535. circuit selection policy, and allows the latter to be overridden
  4536. easily by switching out a policy object. The existing EWMA behavior
  4537. is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
  4538. o New build requirements:
  4539. - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
  4540. strongly recommended.
  4541. - Tor maintainers now require Automake version 1.9 or later to build
  4542. Tor from the Git repository. (Automake is not required when building
  4543. from a source distribution.)
  4544. o Minor features (protocol):
  4545. - No longer include the "opt" prefix when generating routerinfos
  4546. or v2 directories: it has been needless since Tor 0.1.2. Closes
  4547. ticket 5124.
  4548. - Reject EXTEND cells sent to nonexistent streams. According to the
  4549. spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
  4550. we were only checking for stream IDs that were currently in use.
  4551. Found while hunting for more instances of bug 6271. Bugfix on
  4552. 0.0.2pre8, which introduced incremental circuit construction.
  4553. - Tor relays and clients now support a better CREATE/EXTEND cell
  4554. format, allowing the sender to specify multiple address, identity,
  4555. and handshake types. Implements Robert Ransom's proposal 200;
  4556. closes ticket 7199.
  4557. - Reject as invalid most directory objects containing a NUL.
  4558. Belt-and-suspender fix for bug 8037.
  4559. o Minor features (security):
  4560. - Clear keys and key-derived material left on the stack in
  4561. rendservice.c and rendclient.c. Check return value of
  4562. crypto_pk_write_private_key_to_string() in rend_service_load_keys().
  4563. These fixes should make us more forward-secure against cold-boot
  4564. attacks and the like. Fixes bug 2385.
  4565. - Use our own weak RNG when we need a weak RNG. Windows's rand() and
  4566. Irix's random() only return 15 bits; Solaris's random() returns more
  4567. bits but its RAND_MAX says it only returns 15, and so on. Motivated
  4568. by the fix for bug 7801; bugfix on
  4569. o Minor features (control protocol):
  4570. - Add a "GETINFO signal/names" control port command. Implements
  4571. ticket 3842.
  4572. - Provide default values for all options via "GETINFO config/defaults".
  4573. Implements ticket 4971.
  4574. - Allow an optional $ before the node identity digest in the
  4575. controller command GETINFO ns/id/<identity>, for consistency with
  4576. md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
  4577. - Add CACHED keyword to ADDRMAP events in the control protocol
  4578. to indicate whether a DNS result will be cached or not. Resolves
  4579. ticket 8596.
  4580. - Generate bootstrapping status update events correctly when fetching
  4581. microdescriptors. Fixes bug 9927.
  4582. o Minor features (path selection):
  4583. - When deciding whether we have enough descriptors to build circuits,
  4584. instead of looking at raw relay counts, look at which fraction
  4585. of (bandwidth-weighted) paths we're able to build. This approach
  4586. keeps clients from building circuits if their paths are likely to
  4587. stand out statistically. The default fraction of paths needed is
  4588. taken from the consensus directory; you can override it with the
  4589. new PathsNeededToBuildCircuits option. Fixes ticket 5956.
  4590. - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
  4591. and we have GeoIP information, also exclude all nodes with unknown
  4592. countries "??" and "A1". This behavior is controlled by the
  4593. new GeoIPExcludeUnknown option: you can make such nodes always
  4594. excluded with "GeoIPExcludeUnknown 1", and disable the feature
  4595. with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
  4596. gets you the default behavior. Implements feature 7706.
  4597. o Minor features (hidden services):
  4598. - Improve circuit build timeout handling for hidden services.
  4599. In particular: adjust build timeouts more accurately depending
  4600. upon the number of hop-RTTs that a particular circuit type
  4601. undergoes. Additionally, launch intro circuits in parallel
  4602. if they timeout, and take the first one to reply as valid.
  4603. - The Tor client now ignores sub-domain components of a .onion
  4604. address. This change makes HTTP "virtual" hosting
  4605. possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
  4606. http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
  4607. hosted on the same hidden service. Implements proposal 204.
  4608. - Enable Tor to read configuration, state, and key information from
  4609. a FIFO. Previously Tor would only read from files with a positive
  4610. stat.st_size. Code from meejah; fixes bug 6044.
  4611. o Minor features (clients):
  4612. - Teach bridge-using clients to avoid 0.2.2.x bridges when making
  4613. microdescriptor-related dir requests, and only fall back to normal
  4614. descriptors if none of their bridges can handle microdescriptors
  4615. (as opposed to the fix in ticket 4013, which caused them to fall
  4616. back to normal descriptors if *any* of their bridges preferred
  4617. them). Resolves ticket 4994.
  4618. - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
  4619. TCP ports to forward. In the past it only accepted two ports:
  4620. the ORPort and the DirPort.
  4621. o Minor features (protecting client timestamps):
  4622. - Clients no longer send timestamps in their NETINFO cells. These were
  4623. not used for anything, and they provided one small way for clients
  4624. to be distinguished from each other as they moved from network to
  4625. network or behind NAT. Implements part of proposal 222.
  4626. - Clients now round timestamps in INTRODUCE cells down to the nearest
  4627. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  4628. if it's set to "auto" and the feature is disabled in the consensus,
  4629. the timestamp is sent as 0 instead. Implements part of proposal 222.
  4630. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  4631. a big deal from a security point of view, but it achieves no actual
  4632. good purpose, and isn't needed. Implements part of proposal 222.
  4633. - Reduce down accuracy of timestamps in hidden service descriptors.
  4634. Implements part of proposal 222.
  4635. o Minor features (bridges):
  4636. - Make bridge relays check once a minute for whether their IP
  4637. address has changed, rather than only every 15 minutes. Resolves
  4638. bugs 1913 and 1992.
  4639. - Bridge statistics now count bridge clients connecting over IPv6:
  4640. bridge statistics files now list "bridge-ip-versions" and
  4641. extra-info documents list "geoip6-db-digest". The control protocol
  4642. "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
  4643. implementation by "shkoo", addressing ticket 5055.
  4644. - Add a new torrc option "ServerTransportListenAddr" to let bridge
  4645. operators select the address where their pluggable transports will
  4646. listen for connections. Resolves ticket 7013.
  4647. - Randomize the lifetime of our SSL link certificate, so censors can't
  4648. use the static value for filtering Tor flows. Resolves ticket 8443;
  4649. related to ticket 4014 which was included in
  4650. o Minor features (relays):
  4651. - Option OutboundBindAddress can be specified multiple times and
  4652. accepts IPv6 addresses. Resolves ticket 6876.
  4653. o Minor features (IPv6, client side):
  4654. - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
  4655. prefer to hand out virtual IPv6 addresses, since there are more of
  4656. them and we can't run out. To override this behavior and make IPv4
  4657. addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
  4658. or DNSPort you're using for resolving. Implements ticket 7571.
  4659. - AutomapHostsOnResolve responses are now randomized, to avoid
  4660. annoying situations where Tor is restarted and applications
  4661. connect to the wrong addresses.
  4662. - Never try more than 1000 times to pick a new virtual address when
  4663. AutomapHostsOnResolve is set. That's good enough so long as we
  4664. aren't close to handing out our entire virtual address space;
  4665. if you're getting there, it's best to switch to IPv6 virtual
  4666. addresses anyway.
  4667. o Minor features (IPv6, relay/authority side):
  4668. - New config option "AuthDirHasIPv6Connectivity 1" that directory
  4669. authorities should set if they have IPv6 connectivity and want to
  4670. do reachability tests for IPv6 relays. Implements feature 5974.
  4671. - A relay with an IPv6 OR port now sends that address in NETINFO
  4672. cells (in addition to its other address). Implements ticket 6364.
  4673. o Minor features (directory authorities):
  4674. - Directory authorities no long accept descriptors for any version of
  4675. Tor before, or for any 0.2.3 release before
  4676. These versions are insecure, unsupported, or both. Implements
  4677. ticket 6789.
  4678. - When directory authorities are computing thresholds for flags,
  4679. never let the threshold for the Fast flag fall below 4096
  4680. bytes. Also, do not consider nodes with extremely low bandwidths
  4681. when deciding thresholds for various directory flags. This change
  4682. should raise our threshold for Fast relays, possibly in turn
  4683. improving overall network performance; see ticket 1854. Resolves
  4684. ticket 8145.
  4685. - Directory authorities now include inside each vote a statement of
  4686. the performance thresholds they used when assigning flags.
  4687. Implements ticket 8151.
  4688. - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
  4689. in directory authority votes to describe whether they have enough
  4690. measured bandwidths to ignore advertised (relay descriptor)
  4691. bandwidth claims. Resolves ticket 8711.
  4692. o Minor features (path bias detection):
  4693. - Path Use Bias: Perform separate accounting for successful circuit
  4694. use. Keep separate statistics on stream attempt rates versus stream
  4695. success rates for each guard. Provide configurable thresholds to
  4696. determine when to emit log messages or disable use of guards that
  4697. fail too many stream attempts. Resolves ticket 7802.
  4698. - Create three levels of Path Bias log messages, as opposed to just
  4699. two. These are configurable via consensus as well as via the torrc
  4700. options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
  4701. The default values are 0.70, 0.50, and 0.30 respectively.
  4702. - Separate the log message levels from the decision to drop guards,
  4703. which also is available via torrc option PathBiasDropGuards.
  4704. PathBiasDropGuards still defaults to 0 (off).
  4705. - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
  4706. in combination with PathBiasExtremeRate.
  4707. - Increase the default values for PathBiasScaleThreshold and
  4708. PathBiasCircThreshold from (200, 20) to (300, 150).
  4709. - Add in circuit usage accounting to path bias. If we try to use a
  4710. built circuit but fail for any reason, it counts as path bias.
  4711. Certain classes of circuits where the adversary gets to pick your
  4712. destination node are exempt from this accounting. Usage accounting
  4713. can be specifically disabled via consensus parameter or torrc.
  4714. - Convert all internal path bias state to double-precision floating
  4715. point, to avoid roundoff error and other issues.
  4716. - Only record path bias information for circuits that have completed
  4717. *two* hops. Assuming end-to-end tagging is the attack vector, this
  4718. makes us more resilient to ambient circuit failure without any
  4719. detection capability loss.
  4720. o Minor features (build):
  4721. - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
  4722. dhill. Resolves ticket 6982.
  4723. - Compile on win64 using mingw64. Fixes bug 7260; patches from
  4724. "yayooo".
  4725. - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
  4726. separate error codes; or at least, don't break for that reason.
  4727. Fixes bug 7935. Reported by "oftc_must_be_destroyed".
  4728. o Build improvements (autotools):
  4729. - Warn if building on a platform with an unsigned time_t: there
  4730. are too many places where Tor currently assumes that time_t can
  4731. hold negative values. We'd like to fix them all, but probably
  4732. some will remain.
  4733. - Do not report status verbosely from unless the -v flag
  4734. is specified. Fixes issue 4664. Patch from Onizuka.
  4735. - Detect and reject attempts to build Tor with threading support
  4736. when OpenSSL has been compiled without threading support.
  4737. Fixes bug 6673.
  4738. - Try to detect if we are ever building on a platform where
  4739. memset(...,0,...) does not set the value of a double to 0.0. Such
  4740. platforms are permitted by the C standard, though in practice
  4741. they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
  4742. currently support them, but it's better to detect them and fail
  4743. than to perform erroneously.
  4744. - We no longer warn so much when generating manpages from their
  4745. asciidoc source.
  4746. - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
  4747. the signs of types during autoconf. This is better than our old
  4748. approach, which didn't work when cross-compiling.
  4749. o Minor features (log messages, warnings):
  4750. - Detect when we're running with a version of OpenSSL other than the
  4751. one we compiled with. This conflict has occasionally given people
  4752. hard-to-track-down errors.
  4753. - Warn users who run hidden services on a Tor client with
  4754. UseEntryGuards disabled that their hidden services will be
  4755. vulnerable to (the
  4756. attack which motivated Tor to support entry guards in the first
  4757. place). Resolves ticket 6889.
  4758. - Warn when we are binding low ports when hibernation is enabled;
  4759. previously we had warned when we were _advertising_ low ports with
  4760. hibernation enabled. Fixes bug 7285; bugfix on
  4761. - Issue a warning when running with the bufferevents backend enabled.
  4762. It's still not stable, and people should know that they're likely
  4763. to hit unexpected problems. Closes ticket 9147.
  4764. o Minor features (log messages, notices):
  4765. - Refactor resolve_my_address() so it returns the method by which we
  4766. decided our public IP address (explicitly configured, resolved from
  4767. explicit hostname, guessed from interfaces, learned by gethostname).
  4768. Now we can provide more helpful log messages when a relay guesses
  4769. its IP address incorrectly (e.g. due to unexpected lines in
  4770. /etc/hosts). Resolves ticket 2267.
  4771. - Track how many "TAP" and "NTor" circuit handshake requests we get,
  4772. and how many we complete, and log it every hour to help relay
  4773. operators follow trends in network load. Addresses ticket 9658.
  4774. o Minor features (log messages, diagnostics):
  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. - We compute the overhead from passing onionskins back and forth to
  4778. cpuworkers, and report it when dumping statistics in response to
  4779. SIGUSR1. Supports ticket 7291.
  4780. - Add another diagnostic to the heartbeat message: track and log
  4781. overhead that TLS is adding to the data we write. If this is
  4782. high, we are sending too little data to SSL_write at a time.
  4783. Diagnostic for bug 7707.
  4784. - Log packaged cell fullness as part of the heartbeat message.
  4785. Diagnosis to try to determine the extent of bug 7743.
  4786. - Add more detail to a log message about relaxed timeouts, to help
  4787. track bug 7799.
  4788. - When learning a fingerprint for a bridge, log its corresponding
  4789. transport type. Implements ticket 7896.
  4790. - Warn more aggressively when flushing microdescriptors to a
  4791. microdescriptor cache fails, in an attempt to mitigate bug 8031,
  4792. or at least make it more diagnosable.
  4793. - Improve the log message when "Bug/attack: unexpected sendme cell
  4794. from client" occurs, to help us track bug 8093.
  4795. - Improve debugging output to help track down bug 8185 ("Bug:
  4796. outgoing relay cell has n_chan==NULL. Dropping.")
  4797. o Minor features (log messages, quieter bootstrapping):
  4798. - Log fewer lines at level "notice" about our OpenSSL and Libevent
  4799. versions and capabilities when everything is going right. Resolves
  4800. part of ticket 6736.
  4801. - Omit the first heartbeat log message, because it never has anything
  4802. useful to say, and it clutters up the bootstrapping messages.
  4803. Resolves ticket 6758.
  4804. - Don't log about reloading the microdescriptor cache at startup. Our
  4805. bootstrap warnings are supposed to tell the user when there's a
  4806. problem, and our bootstrap notices say when there isn't. Resolves
  4807. ticket 6759; bugfix on
  4808. - Don't log "I learned some more directory information" when we're
  4809. reading cached directory information. Reserve it for when new
  4810. directory information arrives in response to a fetch. Resolves
  4811. ticket 6760.
  4812. - Don't complain about bootstrapping problems while hibernating.
  4813. These complaints reflect a general code problem, but not one
  4814. with any problematic effects (no connections are actually
  4815. opened). Fixes part of bug 7302; bugfix on
  4816. o Minor features (testing):
  4817. - In our testsuite, create temporary directories with a bit more
  4818. entropy in their name to make name collisions less likely. Fixes
  4819. bug 8638.
  4820. - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
  4821. (P-256) Diffie-Hellman handshakes to src/or/bench.
  4822. - Add benchmark functions to test onion handshake performance.
  4823. o Renamed options:
  4824. - The DirServer option is now DirAuthority, for consistency with
  4825. current naming patterns. You can still use the old DirServer form.
  4826. o Minor bugfixes (protocol):
  4827. - Fix the handling of a TRUNCATE cell when it arrives while the
  4828. circuit extension is in progress. Fixes bug 7947; bugfix on
  4829. - When a Tor client gets a "truncated" relay cell, the first byte of
  4830. its payload specifies why the circuit was truncated. We were
  4831. ignoring this 'reason' byte when tearing down the circuit, resulting
  4832. in the controller not being told why the circuit closed. Now we
  4833. pass the reason from the truncated cell to the controller. Bugfix
  4834. on; fixes bug 7039.
  4835. - Fix a misframing issue when reading the version numbers in a
  4836. VERSIONS cell. Previously we would recognize [00 01 00 02] as
  4837. 'version 1, version 2, and version 0x100', when it should have
  4838. only included versions 1 and 2. Fixes bug 8059; bugfix on
  4839. Reported pseudonymously.
  4840. - Make the format and order of STREAM events for DNS lookups
  4841. consistent among the various ways to launch DNS lookups. Fixes
  4842. bug 8203; bugfix on Patch by "Desoxy".
  4843. o Minor bugfixes (syscalls and disk interaction):
  4844. - Always check the return values of functions fcntl() and
  4845. setsockopt(). We don't believe these are ever actually failing in
  4846. practice, but better safe than sorry. Also, checking these return
  4847. values should please analysis tools like Coverity. Patch from
  4848. 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
  4849. - Avoid double-closing the listener socket in our socketpair()
  4850. replacement (used on Windows) in the case where the addresses on
  4851. our opened sockets don't match what we expected. Fixes bug 9400;
  4852. bugfix on 0.0.2pre7. Found by Coverity.
  4853. - Correctly store microdescriptors and extrainfo descriptors that
  4854. include an internal NUL byte. Fixes bug 8037; bugfix on
  4855. Bug reported by "cypherpunks".
  4856. - If for some reason we fail to write a microdescriptor while
  4857. rebuilding the cache, do not let the annotations from that
  4858. microdescriptor linger in the cache file, and do not let the
  4859. microdescriptor stay recorded as present in its old location.
  4860. Fixes bug 9047; bugfix on
  4861. - Use direct writes rather than stdio when building microdescriptor
  4862. caches, in an attempt to mitigate bug 8031, or at least make it
  4863. less common.
  4864. o Minor fixes (config options):
  4865. - Warn and fail if a server is configured not to advertise any
  4866. ORPorts at all. (We need *something* to put in our descriptor,
  4867. or we just won't work.)
  4868. - Behave correctly when the user disables LearnCircuitBuildTimeout
  4869. but doesn't tell us what they would like the timeout to be. Fixes
  4870. bug 6304; bugfix on
  4871. - Rename the (internal-use-only) UsingTestingNetworkDefaults option
  4872. to start with a triple-underscore so the controller won't touch it.
  4873. Patch by Meejah. Fixes bug 3155. Bugfix on
  4874. - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
  4875. so it doesn't start with _. Fixes bug 3155. Bugfix on
  4876. - When autodetecting the number of CPUs, use the number of available
  4877. CPUs in preference to the number of configured CPUs. Inform the
  4878. user if this reduces the number of available CPUs. Fixes bug 8002;
  4879. bugfix on
  4880. - Command-line option "--version" implies "--quiet". Fixes bug 6997.
  4881. - Make it an error when you set EntryNodes but disable UseGuardNodes,
  4882. since it will (surprisingly to some users) ignore EntryNodes. Fixes
  4883. bug 8180; bugfix on
  4884. - Avoid overflows when the user sets MaxCircuitDirtiness to a
  4885. ridiculously high value, by imposing a (ridiculously high) 30-day
  4886. maximum on MaxCircuitDirtiness.
  4887. o Minor bugfixes (control protocol):
  4888. - Stop sending a stray "(null)" in some cases for the server status
  4889. "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
  4890. on
  4891. - The ADDRMAP command can no longer generate an ill-formed error
  4892. code on a failed MAPADDRESS. It now says "internal" rather than
  4893. an English sentence fragment with spaces in the middle. Bugfix on
  4894. Tor
  4895. o Minor bugfixes (clients / edges):
  4896. - When we receive a RELAY_END cell with the reason DONE, or with no
  4897. reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
  4898. status as "connection refused". Previously we reported these cases
  4899. as success but then immediately closed the connection. Fixes bug
  4900. 7902; bugfix on Reported by "oftc_must_be_destroyed".
  4901. - If the guard we choose first doesn't answer, we would try the
  4902. second guard, but once we connected to the second guard we would
  4903. abandon it and retry the first one, slowing down bootstrapping.
  4904. The fix is to treat all our initially chosen guards as acceptable
  4905. to use. Fixes bug 9946; bugfix on
  4906. - When choosing which stream on a formerly stalled circuit to wake
  4907. first, make better use of the platform's weak RNG. Previously,
  4908. we had been using the % ("modulo") operator to try to generate a
  4909. 1/N chance of picking each stream, but this behaves badly with
  4910. many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
  4912. o Minor bugfixes (path bias detection):
  4913. - If the state file's path bias counts are invalid (presumably from a
  4914. buggy Tor prior to, make them correct. Also add
  4915. additional checks and log messages to the scaling of Path Bias
  4916. counts, in case there still are remaining issues with scaling.
  4917. Should help resolve bug 8235.
  4918. - Prevent rounding error in path bias counts when scaling
  4919. them down, and use the correct scale factor default. Also demote
  4920. some path bias related log messages down a level and make others
  4921. less scary sounding. Fixes bug 6647. Bugfix on
  4922. - Remove a source of rounding error during path bias count scaling;
  4923. don't count cannibalized circuits as used for path bias until we
  4924. actually try to use them; and fix a circuit_package_relay_cell()
  4925. warning message about n_chan==NULL. Fixes bug 7802.
  4926. - Paste the description for PathBias parameters from the man
  4927. page into or.h, so the code documents them too. Fixes bug 7982;
  4928. bugfix on
  4929. o Minor bugfixes (relays):
  4930. - Stop trying to resolve our hostname so often (e.g. every time we
  4931. think about doing a directory fetch). Now we reuse the cached
  4932. answer in some cases. Fixes bugs 1992 (bugfix on
  4933. and 2410 (bugfix on
  4934. - When examining the list of network interfaces to find our address,
  4935. do not consider non-running or disabled network interfaces. Fixes
  4936. bug 9904; bugfix on Patch from "hantwister".
  4937. o Minor bugfixes (blocking resistance):
  4938. - Only disable TLS session ticket support when running as a TLS
  4939. server. Now clients will blend better with regular Firefox
  4940. connections. Fixes bug 7189; bugfix on Tor
  4941. o Minor bugfixes (IPv6):
  4942. - Use square brackets around IPv6 addresses in numerous places
  4943. that needed them, including log messages, HTTPS CONNECT proxy
  4944. requests, TransportProxy statefile entries, and pluggable transport
  4945. extra-info lines. Fixes bug 7011; patch by David Fifield.
  4946. o Minor bugfixes (directory authorities):
  4947. - Reject consensus votes with more than 64 known-flags. We aren't even
  4948. close to that limit yet, and our code doesn't handle it correctly.
  4949. Fixes bug 6833; bugfix on
  4950. - Correctly handle votes with more than 31 flags. Fixes bug 6853;
  4951. bugfix on
  4952. o Minor bugfixes (memory leaks):
  4953. - Avoid leaking memory if we fail to compute a consensus signature
  4954. or we generate a consensus we can't parse. Bugfix on
  4955. - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
  4956. on; fixes bug 7816.
  4957. - Fix a memory leak during safe-cookie controller authentication.
  4958. Bugfix on; fixes bug 7816.
  4959. - Free some more still-in-use memory at exit, to make hunting for
  4960. memory leaks easier. Resolves bug 7029.
  4961. o Minor bugfixes (code correctness):
  4962. - Increase the width of the field used to remember a connection's
  4963. link protocol version to two bytes. Harmless for now, since the
  4964. only currently recognized versions are one byte long. Reported
  4965. pseudonymously. Fixes bug 8062; bugfix on
  4966. - Fix a crash when debugging unit tests on Windows: deallocate a
  4967. shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
  4968. bugfix on Reported by "ultramage".
  4969. - When detecting the largest possible file descriptor (in order to
  4970. close all file descriptors when launching a new program), actually
  4971. use _SC_OPEN_MAX. The old code for doing this was very, very broken.
  4972. Fixes bug 8209; bugfix on Found by Coverity; this
  4973. is CID 743383.
  4974. - Avoid a crash if we fail to generate an extrainfo descriptor.
  4975. Fixes bug 8208; bugfix on Found by Coverity;
  4976. this is CID 718634.
  4977. - Avoid an off-by-one error when checking buffer boundaries when
  4978. formatting the exit status of a pluggable transport helper.
  4979. This is probably not an exploitable bug, but better safe than
  4980. sorry. Fixes bug 9928; bugfix on Bug found by
  4981. Pedro Ribeiro.
  4982. - Get rid of a couple of harmless clang warnings, where we compared
  4983. enums to ints. These warnings are newly introduced in clang 3.2.
  4984. o Minor bugfixes (code cleanliness):
  4985. - Avoid use of reserved identifiers in our C code. The C standard
  4986. doesn't like us declaring anything that starts with an
  4987. underscore, so let's knock it off before we get in trouble. Fix
  4988. for bug 1031; bugfix on the first Tor commit.
  4989. - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
  4990. with large values. This situation was untriggered, but nevertheless
  4991. incorrect. Fixes bug 6831; bugfix on
  4992. - Fix an impossible buffer overrun in the AES unit tests. Fixes
  4993. bug 8845; bugfix on Found by eugenis.
  4994. - Fix handling of rendezvous client authorization types over 8.
  4995. Fixes bug 6861; bugfix on
  4996. - Remove a couple of extraneous semicolons that were upsetting the
  4997. cparser library. Patch by Christian Grothoff. Fixes bug 7115;
  4998. bugfix on
  4999. - When complaining about a client port on a public address, log
  5000. which address we're complaining about. Fixes bug 4020; bugfix on
  5001. Patch by Tom Fitzhenry.
  5002. o Minor bugfixes (log messages, warnings):
  5003. - If we encounter a write failure on a SOCKS connection before we
  5004. finish our SOCKS handshake, don't warn that we closed the
  5005. connection before we could send a SOCKS reply. Fixes bug 8427;
  5006. bugfix on
  5007. - Fix a directory authority warn caused when we have a large amount
  5008. of badexit bandwidth. Fixes bug 8419; bugfix on
  5009. - Downgrade "Failed to hand off onionskin" messages to "debug"
  5010. severity, since they're typically redundant with the "Your computer
  5011. is too slow" messages. Fixes bug 7038; bugfix on
  5012. - Avoid spurious warnings when configuring multiple client ports of
  5013. which only some are nonlocal. Previously, we had claimed that some
  5014. were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
  5016. o Minor bugfixes (log messages, other):
  5017. - Fix log messages and comments to avoid saying "GMT" when we mean
  5018. "UTC". Fixes bug 6113.
  5019. - When rejecting a configuration because we were unable to parse a
  5020. quoted string, log an actual error message. Fixes bug 7950; bugfix
  5021. on
  5022. - Correctly recognize that [::1] is a loopback address. Fixes
  5023. bug 8377; bugfix on
  5024. - Don't log inappropriate heartbeat messages when hibernating: a
  5025. hibernating node is _expected_ to drop out of the consensus,
  5026. decide it isn't bootstrapped, and so forth. Fixes bug 7302;
  5027. bugfix on
  5028. - Eliminate several instances where we use "Nickname=ID" to refer to
  5029. nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
  5030. "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
  5031. on
  5032. o Minor bugfixes (build):
  5033. - Fix some bugs in tor-fw-helper-natpmp when trying to build and
  5034. run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
  5035. Fixes bug 7280; bugfix on
  5036. o Documentation fixes:
  5037. - Make the torify manpage no longer refer to tsocks; torify hasn't
  5038. supported tsocks since
  5039. - Make the tor manpage no longer reference tsocks.
  5040. - Fix the GeoIPExcludeUnknown documentation to refer to
  5041. ExcludeExitNodes rather than the currently nonexistent
  5042. ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
  5043. - Resolve a typo in Fixes bug 6819; bugfix on
  5045. - Say "KBytes" rather than "KB" in the man page (for various values
  5046. of K), to further reduce confusion about whether Tor counts in
  5047. units of memory or fractions of units of memory. Resolves ticket 7054.
  5048. - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
  5049. names match. Fixes bug 7768.
  5050. - Fix the documentation of HeartbeatPeriod to say that the heartbeat
  5051. message is logged at notice, not at info.
  5052. - Clarify the usage and risks of setting the ContactInfo torrc line
  5053. for your relay or bridge. Resolves ticket 9854.
  5054. - Add anchors to the manpage so we can link to the html version of
  5055. the documentation for specific options. Resolves ticket 9866.
  5056. - Replace remaining references to DirServer in man page and
  5057. log entries. Resolves ticket 10124.
  5058. o Removed features:
  5059. - Stop exporting estimates of v2 and v3 directory traffic shares
  5060. in extrainfo documents. They were unneeded and sometimes inaccurate.
  5061. Also stop exporting any v2 directory request statistics. Resolves
  5062. ticket 5823.
  5063. - Drop support for detecting and warning about versions of Libevent
  5064. before 1.3e. Nothing reasonable ships with them any longer; warning
  5065. the user about them shouldn't be needed. Resolves ticket 6826.
  5066. - Now that all versions before 0.2.2.x are disallowed, we no longer
  5067. need to work around their missing features. Remove a bunch of
  5068. compatibility code.
  5069. o Removed files:
  5070. - The tor-tsocks.conf is no longer distributed or installed. We
  5071. recommend that tsocks users use torsocks instead. Resolves
  5072. ticket 8290.
  5073. - Remove some of the older contents of doc/ as obsolete; move others
  5074. to torspec.git. Fixes bug 8965.
  5075. o Code simplification:
  5076. - Avoid using character buffers when constructing most directory
  5077. objects: this approach was unwieldy and error-prone. Instead,
  5078. build smartlists of strings, and concatenate them when done.
  5079. - Rename "isin" functions to "contains", for grammar. Resolves
  5080. ticket 5285.
  5081. - Rename Tor's logging function log() to tor_log(), to avoid conflicts
  5082. with the natural logarithm function from the system libm. Resolves
  5083. ticket 7599.
  5084. - Start using OpenBSD's implementation of queue.h, so that we don't
  5085. need to hand-roll our own pointer and list structures whenever we
  5086. need them. (We can't rely on a sys/queue.h, since some operating
  5087. systems don't have them, and the ones that do have them don't all
  5088. present the same extensions.)
  5089. - Start using OpenBSD's implementation of queue.h (originally by
  5090. Niels Provos).
  5091. - Enhance our internal sscanf replacement so that we can eliminate
  5092. the last remaining uses of the system sscanf. (Though those uses
  5093. of sscanf were safe, sscanf itself is generally error prone, so
  5094. we want to eliminate when we can.) Fixes ticket 4195 and Coverity
  5095. CID 448.
  5096. - Replace all calls to snprintf() outside of src/ext with
  5097. tor_snprintf(). Also remove the #define to replace snprintf with
  5098. _snprintf on Windows; they have different semantics, and all of
  5099. our callers should be using tor_snprintf() anyway. Fixes bug 7304.
  5100. o Refactoring:
  5101. - Add a wrapper function for the common "log a message with a
  5102. rate-limit" case.
  5103. - Split the onion.c file into separate modules for the onion queue
  5104. and the different handshakes it supports.
  5105. - Move the client-side address-map/virtual-address/DNS-cache code
  5106. out of connection_edge.c into a new addressmap.c module.
  5107. - Move the entry node code from circuitbuild.c to its own file.
  5108. - Move the circuit build timeout tracking code from circuitbuild.c
  5109. to its own file.
  5110. - Source files taken from other packages now reside in src/ext;
  5111. previously they were scattered around the rest of Tor.
  5112. - Move the generic "config" code into a new file, and have "config.c"
  5113. hold only torrc- and state-related code. Resolves ticket 6823.
  5114. - Move the core of our "choose a weighted element at random" logic
  5115. into its own function, and give it unit tests. Now the logic is
  5116. testable, and a little less fragile too.
  5117. - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
  5118. - Move last_reachable and testing_since from routerinfo_t to node_t.
  5119. Implements ticket 5529.
  5120. - Add replaycache_t structure, functions and unit tests, then refactor
  5121. rend_service_introduce() to be more clear to read, improve, debug,
  5122. and test. Resolves bug 6177.
  5123. o Removed code:
  5124. - Remove some now-needless code that tried to aggressively flush
  5125. OR connections as data was added to them. Since, our
  5126. cell queue logic has saved us from the failure mode that this code
  5127. was supposed to prevent. Removing this code will limit the number
  5128. of baroque control flow paths through Tor's network logic. Reported
  5129. pseudonymously on IRC. Fixes bug 6468; bugfix on
  5130. - Remove unused code for parsing v1 directories and "running routers"
  5131. documents. Fixes bug 6887.
  5132. - Remove the marshalling/unmarshalling code for sending requests to
  5133. cpuworkers over a socket, and instead just send structs. The
  5134. recipient will always be the same Tor binary as the sender, so
  5135. any encoding is overkill.
  5136. - Remove the testing_since field of node_t, which hasn't been used
  5137. for anything since
  5138. - Finally remove support for malloc_good_size and malloc_usable_size.
  5139. We had hoped that these functions would let us eke a little more
  5140. memory out of our malloc implementation. Unfortunately, the only
  5141. implementations that provided these functions are also ones that
  5142. are already efficient about not overallocation: they never got us
  5143. more than 7 or so bytes per allocation. Removing them saves us a
  5144. little code complexity and a nontrivial amount of build complexity.
  5145. Changes in version - 2012-11-19
  5146. The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
  5147. Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
  5148. Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
  5149. programmer, and friend. Unstinting in his dedication to the cause of
  5150. freedom, he inspired and helped many of us as we began our work on
  5151. anonymity, and inspires us still. Please honor his memory by writing
  5152. software to protect people's freedoms, and by helping others to do so.
  5153. Tor, the first stable release in the 0.2.3 branch, features
  5154. significantly reduced directory overhead (via microdescriptors),
  5155. enormous crypto performance improvements for fast relays on new
  5156. enough hardware, a new v3 TLS handshake protocol that can better
  5157. resist fingerprinting, support for protocol obfuscation plugins (aka
  5158. pluggable transports), better scalability for hidden services, IPv6
  5159. support for bridges, performance improvements like allowing clients
  5160. to skip the first round-trip on the circuit ("optimistic data") and
  5161. refilling token buckets more often, a new "stream isolation" design
  5162. to isolate different applications on different circuits, and many
  5163. stability, security, and privacy fixes.
  5164. Major features (v3 directory protocol):
  5165. - Clients now use microdescriptors instead of regular descriptors
  5166. to build circuits. Microdescriptors are authority-generated
  5167. summaries of regular descriptors' contents, designed to change very
  5168. rarely (see proposal 158 for details). This feature is designed
  5169. to save bandwidth, especially for clients on slow internet
  5170. connections. Use "UseMicrodescriptors 0" to disable it.
  5171. - Caches now download, cache, and serve microdescriptors, as well
  5172. as multiple "flavors" of the consensus, including a flavor that
  5173. describes microdescriptors.
  5174. o Major features (build hardening):
  5175. - Enable gcc and ld hardening by default. Resolves ticket 5210.
  5176. o Major features (relay scaling):
  5177. - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
  5178. instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
  5179. vectorized AES implementations as appropriate. These can be much,
  5180. much faster than other AES implementations.
  5181. - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
  5182. implementation. It makes AES_CTR about 7% faster than our old one
  5183. (which was about 10% faster than the one OpenSSL used to provide).
  5184. Resolves ticket 4526.
  5185. - Use OpenSSL's EVP interface for AES encryption, so that all AES
  5186. operations can use hardware acceleration (if present). Resolves
  5187. ticket 4442.
  5188. - Unconditionally use OpenSSL's AES implementation instead of our
  5189. old built-in one. OpenSSL's AES has been better for a while, and
  5190. relatively few servers should still be on any version of OpenSSL
  5191. that doesn't have good optimized assembly AES.
  5192. o Major features (blocking resistance):
  5193. - Update TLS cipher list to match Firefox 8 and later. Resolves
  5194. ticket 4744.
  5195. - Remove support for clients falsely claiming to support standard
  5196. ciphersuites that they can actually provide. As of modern OpenSSL
  5197. versions, it's not necessary to fake any standard ciphersuite,
  5198. and doing so prevents us from using better ciphersuites in the
  5199. future, since servers can't know whether an advertised ciphersuite
  5200. is really supported or not. Some hosts -- notably, ones with very
  5201. old versions of OpenSSL or where OpenSSL has been built with ECC
  5202. disabled -- will stand out because of this change; TBB users should
  5203. not be affected. Implements the client side of proposal 198.
  5204. - Implement a new handshake protocol (v3) for authenticating Tors to
  5205. each other over TLS. It should be more resistant to fingerprinting
  5206. than previous protocols, and should require less TLS hacking for
  5207. future Tor implementations. Implements proposal 176.
  5208. - Allow variable-length padding cells, to disguise the length of
  5209. Tor's TLS records. Implements part of proposal 184.
  5210. - While we're trying to bootstrap, record how many TLS connections
  5211. fail in each state, and report which states saw the most failures
  5212. in response to any bootstrap failures. This feature may speed up
  5213. diagnosis of censorship events. Implements ticket 3116.
  5214. o Major features (pluggable transports):
  5215. - Clients and bridges can now be configured to use a separate
  5216. "transport" proxy. This approach makes the censorship arms race
  5217. easier by allowing bridges to use protocol obfuscation plugins.
  5218. Implements proposal 180 (tickets 2841 and 3472).
  5219. o Major features (DoS resistance):
  5220. - Now that Tor 0.2.0.x is completely deprecated, enable the final
  5221. part of "Proposal 110: Avoiding infinite length circuits" by
  5222. refusing all circuit-extend requests that do not use a relay_early
  5223. cell. This change helps Tor resist a class of denial-of-service
  5224. attacks by limiting the maximum circuit length.
  5225. - Tear down the circuit if we get an unexpected SENDME cell. Clients
  5226. could use this trick to make their circuits receive cells faster
  5227. than our flow control would have allowed, or to gum up the network,
  5228. or possibly to do targeted memory denial-of-service attacks on
  5229. entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
  5230. from July 2002, before the release of Tor 0.0.0.
  5231. o Major features (hidden services):
  5232. - Adjust the number of introduction points that a hidden service
  5233. will try to maintain based on how long its introduction points
  5234. remain in use and how many introductions they handle. Fixes
  5235. part of bug 3825.
  5236. - Add a "tor2web mode" for clients that want to connect to hidden
  5237. services non-anonymously (and possibly more quickly). As a safety
  5238. measure to try to keep users from turning this on without knowing
  5239. what they are doing, tor2web mode must be explicitly enabled at
  5240. compile time, and a copy of Tor compiled to run in tor2web mode
  5241. cannot be used as a normal Tor client. Implements feature 2553.
  5242. o Major features (IPv6):
  5243. - Clients can now connect to private bridges over IPv6. Bridges
  5244. still need at least one IPv4 address in order to connect to
  5245. other relays. Note that we don't yet handle the case where the
  5246. user has two bridge lines for the same bridge (one IPv4, one
  5247. IPv6). Implements parts of proposal 186.
  5248. o Major features (directory authorities):
  5249. - Use a more secure consensus parameter voting algorithm. Now at
  5250. least three directory authorities or a majority of them must
  5251. vote on a given parameter before it will be included in the
  5252. consensus. Implements proposal 178.
  5253. - Remove the artificially low cutoff of 20KB to guarantee the Fast
  5254. flag. In the past few years the average relay speed has picked
  5255. up, and while the "top 7/8 of the network get the Fast flag" and
  5256. "all relays with 20KB or more of capacity get the Fast flag" rules
  5257. used to have the same result, now the top 7/8 of the network has
  5258. a capacity more like 32KB. Bugfix on Fixes bug 4489.
  5259. o Major features (performance):
  5260. - Exit nodes now accept and queue data on not-yet-connected streams.
  5261. Previously, the client wasn't allowed to send data until the
  5262. stream was connected, which slowed down all connections. This
  5263. change will enable clients to perform a "fast-start" on streams
  5264. and send data without having to wait for a confirmation that the
  5265. stream has opened. Patch from Ian Goldberg; implements the server
  5266. side of Proposal 174.
  5267. - When using an exit relay running 0.2.3.x, clients can now
  5268. "optimistically" send data before the exit relay reports that
  5269. the stream has opened. This saves a round trip when starting
  5270. connections where the client speaks first (such as web browsing).
  5271. This behavior is controlled by a consensus parameter (currently
  5272. disabled). To turn it on or off manually, use the "OptimisticData"
  5273. torrc option. Implements proposal 181; code by Ian Goldberg.
  5274. - Add a new TokenBucketRefillInterval option to refill token buckets
  5275. more frequently than once per second. This should improve network
  5276. performance, alleviate queueing problems, and make traffic less
  5277. bursty. Implements proposal 183; closes ticket 3630. Design by
  5278. Florian Tschorsch and Björn Scheuermann; implementation by
  5279. Florian Tschorsch.
  5280. - Raise the threshold of server descriptors needed (75%) and exit
  5281. server descriptors needed (50%) before we will declare ourselves
  5282. bootstrapped. This will make clients start building circuits a
  5283. little later, but makes the initially constructed circuits less
  5284. skewed and less in conflict with further directory fetches. Fixes
  5285. ticket 3196.
  5286. o Major features (relays):
  5287. - Relays now try regenerating and uploading their descriptor more
  5288. frequently if they are not listed in the consensus, or if the
  5289. version of their descriptor listed in the consensus is too
  5290. old. This fix should prevent situations where a server declines
  5291. to re-publish itself because it has done so too recently, even
  5292. though the authorities decided not to list its recent-enough
  5293. descriptor. Fix for bug 3327.
  5294. o Major features (stream isolation):
  5295. - You can now configure Tor so that streams from different
  5296. applications are isolated on different circuits, to prevent an
  5297. attacker who sees your streams as they leave an exit node from
  5298. linking your sessions to one another. To do this, choose some way
  5299. to distinguish the applications: have them connect to different
  5300. SocksPorts, or have one of them use SOCKS4 while the other uses
  5301. SOCKS5, or have them pass different authentication strings to the
  5302. SOCKS proxy. Then, use the new SocksPort syntax to configure the
  5303. degree of isolation you need. This implements Proposal 171.
  5304. - There's a new syntax for specifying multiple client ports (such as
  5305. SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
  5306. multiple *Port entries with full addr:port syntax on each.
  5307. The old *ListenAddress format is still supported, but you can't
  5308. mix it with the new *Port syntax.
  5309. o Major features (bufferevents):
  5310. - Tor can now optionally build with the "bufferevents" buffered IO
  5311. backend provided by Libevent 2. To use this feature, make sure you
  5312. have the latest possible version of Libevent, and pass the
  5313. --enable-bufferevents flag to configure when building Tor from
  5314. source. This feature will make our networking code more flexible,
  5315. let us stack layers on each other, and let us use more efficient
  5316. zero-copy transports where available.
  5317. - Add experimental support for running on Windows with IOCP and no
  5318. kernel-space socket buffers. This feature is controlled by a new
  5319. "UserspaceIOCPBuffers" config option (off by default), which has
  5320. no effect unless Tor has been built with bufferevents enabled,
  5321. you're running on Windows, and you've set "DisableIOCP 0". In the
  5322. long run, this may help solve or mitigate bug 98.
  5323. o Major features (path selection):
  5324. - The EntryNodes option can now include country codes like {de} or IP
  5325. addresses or network masks. Previously we had disallowed these
  5326. options because we didn't have an efficient way to keep the list up
  5327. to date. Addresses ticket 1982, but see bug 2798 for an unresolved
  5328. issue here.
  5329. o Major features (port forwarding):
  5330. - Add support for automatic port mapping on the many home routers
  5331. that support NAT-PMP or UPnP. To build the support code, you'll
  5332. need to have the libnatpnp library and/or the libminiupnpc library,
  5333. and you'll need to enable the feature specifically by passing
  5334. "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
  5335. it on, use the new PortForwarding option.
  5336. o Major features (logging):
  5337. - Add a new 'Heartbeat' log message type to periodically log a message
  5338. describing Tor's status at level Notice. This feature is meant for
  5339. operators who log at notice, and want to make sure that their Tor
  5340. server is still working. Implementation by George Kadianakis.
  5341. - Make logging resolution configurable with a new LogTimeGranularity
  5342. option, and change the default from 1 millisecond to 1 second.
  5343. Implements enhancement 1668.
  5344. o Major features (other):
  5345. - New "DisableNetwork" config option to prevent Tor from launching any
  5346. connections or accepting any connections except on a control port.
  5347. Bundles and controllers can set this option before letting Tor talk
  5348. to the rest of the network, for example to prevent any connections
  5349. to a non-bridge address. Packages like Orbot can also use this
  5350. option to instruct Tor to save power when the network is off.
  5351. - Try to use system facilities for enumerating local interface
  5352. addresses, before falling back to our old approach (which was
  5353. binding a UDP socket, and calling getsockname() on it). That
  5354. approach was scaring OS X users whose draconian firewall
  5355. software warned about binding to UDP sockets regardless of
  5356. whether packets were sent. Now we try to use getifaddrs(),
  5357. SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
  5358. system supports. Resolves ticket 1827.
  5359. - Add experimental support for a "defaults" torrc file to be parsed
  5360. before the regular torrc. Torrc options override the defaults file's
  5361. options in the same way that the command line overrides the torrc.
  5362. The SAVECONF controller command saves only those options which
  5363. differ between the current configuration and the defaults file. HUP
  5364. reloads both files. Implements task 4552.
  5365. o New directory authorities:
  5366. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  5367. authority. Closes ticket 5749.
  5368. o Security/privacy fixes:
  5369. - Avoid read-from-freed-memory and double-free bugs that could occur
  5370. when a DNS request fails while launching it. Fixes bug 6480;
  5371. bugfix on
  5372. - Reject any attempt to extend to an internal address. Without
  5373. this fix, a router could be used to probe addresses on an internal
  5374. network to see whether they were accepting connections. Fixes bug
  5375. 6710; bugfix on 0.0.8pre1.
  5376. - Close any connection that sends unrecognized junk before the TLS
  5377. handshake. Solves an issue noted in bug 4369.
  5378. - The advertised platform of a relay now includes only its operating
  5379. system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
  5380. its service pack level (for Windows) or its CPU architecture
  5381. (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
  5382. can insert an extra string in the platform line by setting the
  5383. preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
  5384. - Disable TLS session tickets. OpenSSL's implementation was giving
  5385. our TLS session keys the lifetime of our TLS context objects, when
  5386. perfect forward secrecy would want us to discard anything that
  5387. could decrypt a link connection as soon as the link connection
  5388. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  5389. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  5390. - Tor tries to wipe potentially sensitive data after using it, so
  5391. that if some subsequent security failure exposes Tor's memory,
  5392. the damage will be limited. But we had a bug where the compiler
  5393. was eliminating these wipe operations when it decided that the
  5394. memory was no longer visible to a (correctly running) program,
  5395. hence defeating our attempt at defense in depth. We fix that
  5396. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  5397. is unlikely to optimize away. Future versions of Tor may use
  5398. a less ridiculously heavy approach for this. Fixes bug 7352.
  5399. Reported in an article by Andrey Karpov.
  5400. o Major bugfixes (crashes and asserts):
  5401. - Avoid a pair of double-free and use-after-mark bugs that can
  5402. occur with certain timings in canceled and re-received DNS
  5403. requests. Fixes bug 6472; bugfix on 0.0.7rc1.
  5404. - Fix a denial of service attack by which any directory authority
  5405. could crash all the others, or by which a single v2 directory
  5406. authority could crash everybody downloading v2 directory
  5407. information. Fixes bug 7191; bugfix on
  5408. - Fix an assert that directory authorities could trigger on sighup
  5409. during some configuration state transitions. We now don't treat
  5410. it as a fatal error when the new descriptor we just generated in
  5411. init_keys() isn't accepted. Fixes bug 4438; bugfix on
  5412. - Avoid segfault when starting up having run with an extremely old
  5413. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  5414. on
  5415. o Major bugfixes (clients):
  5416. - If we are unable to find any exit that supports our predicted ports,
  5417. stop calling them predicted, so that we don't loop and build
  5418. hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
  5419. which introduced predicted ports.
  5420. - Check at each new consensus whether our entry guards were picked
  5421. long enough ago that we should rotate them. Previously, we only
  5422. did this check at startup, which could lead to us holding a guard
  5423. indefinitely. Fixes bug 5380; bugfix on
  5424. - When fetching a bridge descriptor from a bridge authority,
  5425. always do so anonymously, whether we have been able to open
  5426. circuits or not. Partial fix for bug 1938; bugfix on
  5427. This behavior makes it *safer* to use UpdateBridgesFromAuthority,
  5428. but we'll need to wait for bug 6010 before it's actually usable.
  5429. o Major bugfixes (directory voting):
  5430. - Check more thoroughly to prevent a rogue authority from
  5431. double-voting on any consensus directory parameter. Previously,
  5432. authorities would crash in this case if the total number of
  5433. votes for any parameter exceeded the number of active voters,
  5434. but would let it pass otherwise. Partially fixes bug 5786; bugfix
  5435. on
  5436. - When computing weight parameters, behave more robustly in the
  5437. presence of a bad bwweightscale value. Previously, the authorities
  5438. would crash if they agreed on a sufficiently broken weight_scale
  5439. value; now, they use a reasonable default and carry on. Fixes the
  5440. rest of bug 5786; bugfix on
  5441. - If authorities are unable to get a v2 consensus document from other
  5442. directory authorities, they no longer fall back to fetching
  5443. them from regular directory caches. Fixes bug 5635; bugfix on
  5444., where routers stopped downloading v2 consensus
  5445. documents entirely.
  5446. o Major bugfixes (relays):
  5447. - Fix a bug handling SENDME cells on nonexistent streams that could
  5448. result in bizarre window values. Report and patch contributed
  5449. pseudonymously. Fixes part of bug 6271. This bug was introduced
  5450. before the first Tor release, in svn commit r152.
  5451. - Don't update the AccountingSoftLimitHitAt state file entry whenever
  5452. tor gets started. This prevents a wrong average bandwidth
  5453. estimate, which would cause relays to always start a new accounting
  5454. interval at the earliest possible moment. Fixes bug 2003; bugfix
  5455. on Reported by Bryon Eldridge, who also helped
  5456. immensely in tracking this bug down.
  5457. - Fix a possible crash bug when checking for deactivated circuits
  5458. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  5459. bugfix on Bug report and fix received pseudonymously.
  5460. - Set the SO_REUSEADDR socket option before we call bind() on outgoing
  5461. connections. This change should allow busy exit relays to stop
  5462. running out of available sockets as quickly. Fixes bug 4950;
  5463. bugfix on
  5464. o Major bugfixes (blocking resistance):
  5465. - Bridges no longer include their address in NETINFO cells on outgoing
  5466. OR connections, to allow them to blend in better with clients.
  5467. Removes another avenue for enumerating bridges. Reported by
  5468. "troll_un". Fixes bug 4348; bugfix on, when NETINFO
  5469. cells were introduced.
  5470. - Warn the user when HTTPProxy, but no other proxy type, is
  5471. configured. This can cause surprising behavior: it doesn't send
  5472. all of Tor's traffic over the HTTPProxy -- it sends unencrypted
  5473. directory traffic only. Resolves ticket 4663.
  5474. o Major bugfixes (hidden services):
  5475. - Improve hidden service robustness: when an attempt to connect to
  5476. a hidden service ends, be willing to refetch its hidden service
  5477. descriptors from each of the HSDir relays responsible for them
  5478. immediately. Previously, we would not consider refetching the
  5479. service's descriptors from each HSDir for 15 minutes after the last
  5480. fetch, which was inconvenient if the hidden service was not running
  5481. during the first attempt. Bugfix on; fixes bug 3335.
  5482. - Hidden services now ignore the timestamps on INTRODUCE2 cells.
  5483. They used to check that the timestamp was within 30 minutes
  5484. of their system clock, so they could cap the size of their
  5485. replay-detection cache, but that approach unnecessarily refused
  5486. service to clients with wrong clocks. Bugfix on, when
  5487. the v3 intro-point protocol (the first one which sent a timestamp
  5488. field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
  5489. - When one of a hidden service's introduction points appears to be
  5490. unreachable, stop trying it. Previously, we would keep trying
  5491. to build circuits to the introduction point until we lost the
  5492. descriptor, usually because the user gave up and restarted Tor.
  5493. Fixes part of bug 3825.
  5494. o Changes to default torrc file:
  5495. - Stop listing "socksport 9050" in torrc.sample. We open a socks
  5496. port on 9050 by default anyway, so this should not change anything
  5497. in practice.
  5498. - Stop mentioning the deprecated *ListenAddress options in
  5499. torrc.sample. Fixes bug 5438.
  5500. - Document unit of bandwidth-related options in sample torrc.
  5501. Fixes bug 5621.
  5502. - Fix broken URLs in the sample torrc file, and tell readers about
  5503. the OutboundBindAddress, ExitPolicyRejectPrivate, and
  5504. PublishServerDescriptor options. Addresses bug 4652.
  5505. o Minor features (directory authorities):
  5506. - Consider new, removed or changed IPv6 OR ports a non-cosmetic
  5507. change when the authority is deciding whether to accept a newly
  5508. uploaded descriptor. Implements ticket 6423.
  5509. - Directory authorities are now a little more lenient at accepting
  5510. older router descriptors, or newer router descriptors that don't
  5511. make big changes. This should help ameliorate past and future
  5512. issues where routers think they have uploaded valid descriptors,
  5513. but the authorities don't think so. Fix for ticket 2479.
  5514. - Authority operators can now vote for all relays in a given
  5515. set of countries to be BadDir/BadExit/Invalid/Rejected.
  5516. - Provide two consensus parameters (FastFlagMinThreshold and
  5517. FastFlagMaxThreshold) to control the range of allowable bandwidths
  5518. for the Fast directory flag. These allow authorities to run
  5519. experiments on appropriate requirements for being a "Fast" node.
  5520. The AuthDirFastGuarantee config value still applies. Implements
  5521. ticket 3946.
  5522. o Minor features (bridges / bridge authorities):
  5523. - Make bridge SSL certificates a bit more stealthy by using random
  5524. serial numbers, in the same fashion as OpenSSL when generating
  5525. self-signed certificates. Implements ticket 4584.
  5526. - Tag a bridge's descriptor as "never to be sent unencrypted".
  5527. This shouldn't matter, since bridges don't open non-anonymous
  5528. connections to the bridge authority and don't allow unencrypted
  5529. directory connections from clients, but we might as well make
  5530. sure. Closes bug 5139.
  5531. - The Bridge Authority now writes statistics on how many bridge
  5532. descriptors it gave out in total, and how many unique descriptors
  5533. it gave out. It also lists how often the most and least commonly
  5534. fetched descriptors were given out, as well as the median and
  5535. 25th/75th percentile. Implements tickets 4200 and 4294.
  5536. o Minor features (IPv6):
  5537. - Make the code that clients use to detect an address change be
  5538. IPv6-aware, so that it won't fill clients' logs with error
  5539. messages when trying to get the IPv4 address of an IPv6
  5540. connection. Implements ticket 5537.
  5541. - Relays now understand an IPv6 address when they get one from a
  5542. directory server. Resolves ticket 4875.
  5543. o Minor features (hidden services):
  5544. - Expire old or over-used hidden service introduction points.
  5545. Required by fix for bug 3460.
  5546. - Reduce the lifetime of elements of hidden services' Diffie-Hellman
  5547. public key replay-detection cache from 60 minutes to 5 minutes. This
  5548. replay-detection cache is now used only to detect multiple
  5549. INTRODUCE2 cells specifying the same rendezvous point, so we can
  5550. avoid launching multiple simultaneous attempts to connect to it.
  5551. - When a hidden service's introduction point times out, consider
  5552. trying it again during the next attempt to connect to the
  5553. HS. Previously, we would not try it again unless a newly fetched
  5554. descriptor contained it. Required by fixes for bugs 1297 and 3825.
  5555. o Minor features (relays):
  5556. - Relays now include a reason for regenerating their descriptors
  5557. in an HTTP header when uploading to the authorities. This will
  5558. make it easier to debug descriptor-upload issues in the future.
  5559. - Turn on directory request statistics by default and include them in
  5560. extra-info descriptors. Don't break if we have no GeoIP database.
  5561. - Replace files in stats/ rather than appending to them. Now that we
  5562. include statistics in extra-info descriptors, it makes no sense to
  5563. keep old statistics forever. Implements ticket 2930.
  5564. - Relays that set "ConnDirectionStatistics 1" write statistics on the
  5565. bidirectional use of connections to disk every 24 hours.
  5566. - Add a GeoIP file digest to the extra-info descriptor. Implements
  5567. ticket 1883.
  5568. o Minor features (new config options):
  5569. - New config option "DynamicDHGroups" (disabled by default) provides
  5570. each bridge with a unique prime DH modulus to be used during
  5571. SSL handshakes. This option attempts to help against censors
  5572. who might use the Apache DH modulus as a static identifier for
  5573. bridges. Addresses ticket 4548.
  5574. - New config option "DisableDebuggerAttachment" (on by default)
  5575. to prevent basic debugging attachment attempts by other processes.
  5576. Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
  5577. - Ordinarily, Tor does not count traffic from private addresses (like
  5578. or when calculating rate limits or accounting.
  5579. There is now a new option, CountPrivateBandwidth, to disable this
  5580. behavior. Patch from Daniel Cagara.
  5581. o Minor features (different behavior for old config options):
  5582. - Allow MapAddress directives to specify matches against super-domains,
  5583. as in "MapAddress * *".
  5584. Implements issue 933.
  5585. - Don't disable the DirPort when we cannot exceed our AccountingMax
  5586. limit during this interval because the effective bandwidthrate is
  5587. low enough. This is useful in a situation where AccountMax is only
  5588. used as an additional safeguard or to provide statistics.
  5589. - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
  5590. implements ticket 3439.
  5591. - When configuring a large set of nodes in EntryNodes, and there are
  5592. enough of them listed as Guard so that we don't need to consider
  5593. the non-guard entries, prefer the ones listed with the Guard flag.
  5594. - If you set the NumCPUs option to 0, Tor will now try to detect how
  5595. many CPUs you have. This is the new default behavior.
  5596. - The NodeFamily option -- which let you declare that you want to
  5597. consider nodes to be part of a family whether they list themselves
  5598. that way or not -- now allows IP address ranges and country codes.
  5599. o Minor features (new command-line config behavior):
  5600. - Slightly change behavior of "list" options (that is, config
  5601. options that can appear more than once) when they appear both in
  5602. torrc and on the command line. Previously, the command-line options
  5603. would be appended to the ones from torrc. Now, the command-line
  5604. options override the torrc options entirely. This new behavior
  5605. allows the user to override list options (like exit policies and
  5606. ports to listen on) from the command line, rather than simply
  5607. appending to the list.
  5608. - You can get the old (appending) command-line behavior for "list"
  5609. options by prefixing the option name with a "+".
  5610. - You can remove all the values for a "list" option from the command
  5611. line without adding any new ones by prefixing the option name
  5612. with a "/".
  5613. o Minor features (controller, new events):
  5614. - Extend the control protocol to report flags that control a circuit's
  5615. path selection in CIRC events and in replies to 'GETINFO
  5616. circuit-status'. Implements part of ticket 2411.
  5617. - Extend the control protocol to report the hidden service address
  5618. and current state of a hidden-service-related circuit in CIRC
  5619. events and in replies to 'GETINFO circuit-status'. Implements part
  5620. of ticket 2411.
  5621. - Include the creation time of a circuit in CIRC and CIRC2
  5622. control-port events and the list produced by the 'GETINFO
  5623. circuit-status' control-port command.
  5624. - Add a new CONF_CHANGED event so that controllers can be notified
  5625. of any configuration changes made by other controllers, or by the
  5626. user. Implements ticket 1692.
  5627. - Add a new SIGNAL event to the controller interface so that
  5628. controllers can be notified when Tor handles a signal. Resolves
  5629. issue 1955. Patch by John Brooks.
  5630. o Minor features (controller, new getinfo options):
  5631. - Expose our view of whether we have gone dormant to the controller,
  5632. via a new "GETINFO dormant" value. Torbutton and other controllers
  5633. can use this to avoid doing periodic requests through Tor while
  5634. it's dormant (bug 4718). Resolves ticket 5954.
  5635. - Add a new GETINFO option to get total bytes read and written. Patch
  5636. from pipe, revised by atagar. Resolves ticket 2345.
  5637. - Implement new GETINFO controller fields to provide information about
  5638. the Tor process's pid, euid, username, and resource limits.
  5639. o Minor features (controller, other):
  5640. - Allow controllers to request an event notification whenever a
  5641. circuit is cannibalized or its purpose is changed. Implements
  5642. part of ticket 3457.
  5643. - Use absolute path names when reporting the torrc filename in the
  5644. control protocol, so a controller can more easily find the torrc
  5645. file. Resolves bug 1101.
  5646. - When reporting the path to the cookie file to the controller,
  5647. give an absolute path. Resolves ticket 4881.
  5648. o Minor features (log messages):
  5649. - Add more information to a log statement that might help track down
  5650. bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
  5651. non-IP address" messages (or any Bug messages, for that matter!),
  5652. please let us know about it.
  5653. - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
  5654. EntryNodes will have no effect. Resolves issue 2571.
  5655. - Try to make the introductory warning message that Tor prints on
  5656. startup more useful for actually finding help and information.
  5657. Resolves ticket 2474.
  5658. - When the system call to create a listener socket fails, log the
  5659. error message explaining why. This may help diagnose bug 4027.
  5660. o Minor features (other):
  5661. - When we fail to initialize Libevent, retry with IOCP disabled so we
  5662. don't need to turn on multi-threading support in Libevent, which in
  5663. turn requires a working socketpair(). This is a workaround for bug
  5664. 4457, which affects Libevent versions from 2.0.1-alpha through
  5665. 2.0.15-stable.
  5666. - When starting as root and then changing our UID via the User
  5667. control option, and we have a ControlSocket configured, make sure
  5668. that the ControlSocket is owned by the same account that Tor will
  5669. run under. Implements ticket 3421; fix by Jérémy Bobbio.
  5670. - Accept attempts to include a password authenticator in the
  5671. handshake, as supported by SOCKS5. This handles SOCKS clients that
  5672. don't know how to omit a password when authenticating. Resolves
  5673. bug 1666.
  5674. - Check for and recover from inconsistency in the microdescriptor
  5675. cache. This will make it harder for us to accidentally free a
  5676. microdescriptor without removing it from the appropriate data
  5677. structures. Fixes issue 3135; issue noted by "wanoskarnet".
  5678. - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
  5679. o Minor bugfixes (code security):
  5680. - Prevent a null-pointer dereference when receiving a data cell
  5681. for a nonexistent stream when the circuit in question has an
  5682. empty deliver window. We don't believe this is triggerable,
  5683. since we don't currently allow deliver windows to become empty,
  5684. but the logic is tricky enough that it's better to make the code
  5685. robust. Fixes bug 5541; bugfix on 0.0.2pre14.
  5686. - Fix a (harmless) integer overflow in cell statistics reported by
  5687. some fast relays. Fixes bug 5849; bugfix on
  5688. - Fix our implementation of crypto_random_hostname() so it can't
  5689. overflow on ridiculously large inputs. (No Tor version has ever
  5690. provided this kind of bad inputs, but let's be correct in depth.)
  5691. Fixes bug 4413; bugfix on Fix by Stephen Palmateer.
  5692. - Add a (probably redundant) memory clear between iterations of
  5693. the router status voting loop, to prevent future coding errors
  5694. where data might leak between iterations of the loop. Resolves
  5695. ticket 6514.
  5696. o Minor bugfixes (wrapper functions):
  5697. - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
  5698. utility function used in the control-port code). This shouldn't
  5699. ever happen unless Tor is completely out of memory, but if it did
  5700. happen and Tor somehow recovered from it, Tor could have sent a log
  5701. message to a control port in the middle of a reply to a controller
  5702. command. Fixes part of bug 3428; bugfix on
  5703. - Fix some (not actually triggerable) buffer size checks in usage of
  5704. tor_inet_ntop(). Fixes bug 4434; bugfix on Tor Patch
  5705. by Anders Sundman.
  5706. - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
  5707. bug 4515; bugfix on; fix by Anders Sundman.
  5708. - Enforce correct return behavior of tor_vsscanf() when the '%%'
  5709. pattern is used. Fixes bug 5558. Bugfix on
  5710. - Make our replacement implementation of strtok_r() compatible with
  5711. the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
  5712. bugfix on
  5713. - Find more places in the code that should have been testing for
  5714. invalid sockets using the SOCKET_OK macro. Required for a fix
  5715. for bug 4533. Bugfix on
  5716. o Minor bugfixes (code correctness):
  5717. - Check return value of fputs() when writing authority certificate
  5718. file. Fixes Coverity issue 709056; bugfix on
  5719. - When building Tor on Windows with -DUNICODE (not default), ensure
  5720. that error messages, filenames, and DNS server names are always
  5721. NUL-terminated when we convert them to a single-byte encoding.
  5722. Fixes bug 5909; bugfix on
  5723. - Fix a memory leak when trying to launch a DNS request when the
  5724. nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
  5726. - Correct file sizes when reading binary files on Cygwin, to avoid
  5727. a bug where Tor would fail to read its state file. Fixes bug 6844;
  5728. bugfix on
  5729. - Make sure to set *socket_error in all error cases in
  5730. connection_connect(), so it can't produce a warning about
  5731. errno being zero from errno_to_orconn_end_reason(). Bugfix on
  5732.; resolves ticket 6028.
  5733. - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
  5734. bug 4532; found by "troll_un".
  5735. o Minor bugfixes (clients):
  5736. - Allow one-hop directory-fetching circuits the full "circuit build
  5737. timeout" period, rather than just half of it, before failing them
  5738. and marking the relay down. This fix should help reduce cases where
  5739. clients declare relays (or worse, bridges) unreachable because
  5740. the TLS handshake takes a few seconds to complete. Fixes bug 6743;
  5741. bugfix on, where we changed the timeout from a static
  5742. 30 seconds.
  5743. - Ensure we don't cannibalize circuits that are longer than three hops
  5744. already, so we don't end up making circuits with 5 or more
  5745. hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
  5746. which introduced cannibalization.
  5747. o Minor bugfixes (relays):
  5748. - Don't publish a new relay descriptor when we reload our onion key,
  5749. unless the onion key has actually changed. Fixes bug 3263 and
  5750. resolves another cause of bug 1810. Bugfix on
  5751. - When relays refuse a "create" cell because their queue of pending
  5752. create cells is too big (typically because their cpu can't keep up
  5753. with the arrival rate), send back reason "resource limit" rather
  5754. than reason "internal", so network measurement scripts can get a
  5755. more accurate picture. Bugfix on; fixes bug 7037.
  5756. - Exit nodes don't need to fetch certificates for authorities that
  5757. they don't recognize; only directory authorities, bridges,
  5758. and caches need to do that. Fixes part of bug 2297; bugfix on
  5760. o Minor bugfixes (directory authority / mirrors):
  5761. - Avoid O(n^2) performance characteristics when parsing a large
  5762. extrainfo cache. Fixes bug 5828; bugfix on
  5763. - Authorities no longer include any router in their microdescriptor
  5764. consensuses for which they couldn't generate or agree on a
  5765. microdescriptor. Fixes the second piece of bug 6404; fix on
  5767. - When checking for requested signatures on the latest consensus
  5768. before serving it to a client, make sure to check the right
  5769. consensus flavor. Bugfix on
  5770. - Fix an edge case where TestingTorNetwork is set but the authorities
  5771. and relays all have an uptime of zero, so the private Tor network
  5772. could briefly lack support for hidden services. Fixes bug 3886;
  5773. bugfix on
  5774. - Directory caches no longer refuse to clean out descriptors because
  5775. of missing v2 networkstatus documents, unless they're configured
  5776. to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
  5777. Patch by Daniel Bryg.
  5778. - Don't serve or accept v2 hidden service descriptors over a relay's
  5779. DirPort. It's never correct to do so, and disabling it might
  5780. make it more annoying to exploit any bugs that turn up in the
  5781. descriptor-parsing code. Fixes bug 7149.
  5782. o Minor bugfixes (hidden services, client-side):
  5783. - Assert that hidden-service-related operations are not performed
  5784. using single-hop circuits. Previously, Tor would assert that
  5785. client-side streams are not attached to single-hop circuits,
  5786. but not that other sensitive operations on the client and service
  5787. side are not performed using single-hop circuits. Fixes bug 3332;
  5788. bugfix on 0.0.6.
  5789. - Avoid undefined behavior when parsing the list of supported
  5790. rendezvous/introduction protocols in a hidden service descriptor.
  5791. Previously, Tor would have confused (as-yet-unused) protocol version
  5792. numbers greater than 32 with lower ones on many platforms. Fixes
  5793. bug 6827; bugfix on Found by George Kadianakis.
  5794. - Don't close hidden service client circuits which have almost
  5795. finished connecting to their destination when they reach
  5796. the normal circuit-build timeout. Previously, we would close
  5797. introduction circuits which are waiting for an acknowledgement
  5798. from the introduction point, and rendezvous circuits which have
  5799. been specified in an INTRODUCE1 cell sent to a hidden service,
  5800. after the normal CBT. Now, we mark them as 'timed out', and launch
  5801. another rendezvous attempt in parallel. This behavior change can
  5802. be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
  5803. option. Fixes part of bug 1297; bugfix on
  5804. o Minor bugfixes (hidden services, service-side):
  5805. - Don't close hidden-service-side rendezvous circuits when they
  5806. reach the normal circuit-build timeout. This behavior change can
  5807. be disabled using the new
  5808. CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
  5809. remaining part of bug 1297; bugfix on
  5810. - Don't launch more than 10 service-side introduction-point circuits
  5811. for a hidden service in five minutes. Previously, we would consider
  5812. launching more introduction-point circuits if at least one second
  5813. had passed without any introduction-point circuits failing. Fixes
  5814. bug 4607; bugfix on 0.0.7pre1.
  5815. o Minor bugfixes (config option behavior):
  5816. - If the user tries to set MyFamily on a bridge, refuse to
  5817. do so, and warn about the security implications. Fixes bug 4657;
  5818. bugfix on
  5819. - The "--quiet" and "--hush" options now apply not only to Tor's
  5820. behavior before logs are configured, but also to Tor's behavior in
  5821. the absense of configured logs. Fixes bug 3550; bugfix on
  5823. - Change the AllowDotExit rules so they should actually work.
  5824. We now enforce AllowDotExit only immediately after receiving an
  5825. address via SOCKS or DNSPort: other sources are free to provide
  5826. .exit addresses after the resolution occurs. Fixes bug 3940;
  5827. bugfix on
  5828. - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
  5829. don't depend on the consensus parameters or compute adaptive
  5830. timeouts when it is disabled. Fixes bug 5049; bugfix on
  5832. - After we pick a directory mirror, we would refuse to use it if
  5833. it's in our ExcludeExitNodes list, resulting in mysterious failures
  5834. to bootstrap for people who just wanted to avoid exiting from
  5835. certain locations. Fixes bug 5623; bugfix on
  5836. - When told to add a bridge with the same digest as a preexisting
  5837. bridge but a different addr:port, change the addr:port as
  5838. requested. Previously we would not notice the change. Fixes half
  5839. of bug 5603; fix on
  5840. o Minor bugfixes (controller):
  5841. - Allow manual 'authenticate' commands to the controller interface
  5842. from netcat (nc) as well as telnet. We were rejecting them because
  5843. they didn't come with the expected whitespace at the end of the
  5844. command. Bugfix on; fixes bug 2893.
  5845. - Report a real bootstrap problem to the controller on router
  5846. identity mismatch. Previously we just said "foo", which probably
  5847. made a lot of sense at the time. Fixes bug 4169; bugfix on
  5849. - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
  5850. option is set to 0 (which Vidalia version 0.2.16 now does when
  5851. a SAVECONF attempt fails), perform other actions that SIGHUP
  5852. usually causes (like reopening the logs). Fixes bug 5095; bugfix
  5853. on
  5854. - Correctly handle checking the permissions on the parent
  5855. directory of a control socket in the root directory. Bug found
  5856. by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
  5858. - End AUTHCHALLENGE error messages (in the control protocol) with
  5859. a CRLF. Fixes bug 5760; bugfix on
  5860. o Minor bugfixes (network reading/writing):
  5861. - Disable writing on marked-for-close connections when they are
  5862. blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
  5863. bug 5263; bugfix on 0.0.2pre13, where we first added a special
  5864. case for flushing marked connections.
  5865. - Make sure that there are no unhandled pending TLS errors before
  5866. reading from a TLS stream. We had checks in, but
  5867. lost them in when we refactored read_to_buf_tls().
  5868. Bugfix on; fixes bug 4528.
  5869. - Detect SSL handshake even when the initial attempt to write the
  5870. server hello fails. Fixes bug 4592; bugfix on
  5871. - If the client fails to set a reasonable set of ciphersuites
  5872. during its v2 handshake renegotiation, allow the renegotiation to
  5873. continue nevertheless (i.e. send all the required certificates).
  5874. Fixes bug 4591; bugfix on
  5875. o Minor bugfixes (other):
  5876. - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
  5877. resource exhaustion, so that clients can adjust their load to
  5878. try other exits. Fixes bug 4710; bugfix on, which
  5880. - Don't check for whether the address we're using for outbound
  5881. connections has changed until after the outbound connection has
  5882. completed. On Windows, getsockname() doesn't succeed until the
  5883. connection is finished. Fixes bug 5374; bugfix on
  5884. - Don't hold a Windows file handle open for every file mapping;
  5885. the file mapping handle is sufficient. Fixes bug 5951; bugfix on
  5887. - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
  5888. bugfix on
  5889. - If we fail to write a microdescriptor to the disk cache, do not
  5890. continue replacing the old microdescriptor file. Fixes bug 2954;
  5891. bugfix on
  5892. o Minor bugfixes (log messages, path selection):
  5893. - Downgrade "set buildtimeout to low value" messages to "info"
  5894. severity; they were never an actual problem, there was never
  5895. anything reasonable to do about them, and they tended to spam logs
  5896. from time to time. Fixes bug 6251; bugfix on
  5897. - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
  5898. more information to it, so that we can track it down in case it
  5899. returns again. Mitigates bug 5235.
  5900. - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
  5901. options_validate(); warn if LearnCircuitBuildTimeout is disabled and
  5902. CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
  5903. - Issue a log message if a guard completes less than 40% of your
  5904. circuits. Threshold is configurable by torrc option
  5905. PathBiasNoticeRate and consensus parameter pb_noticepct. There is
  5906. additional, off-by-default code to disable guards which fail too
  5907. many circuits. Addresses ticket 5458.
  5908. o Minor bugfixes (log messages, client):
  5909. - Downgrade "Got a certificate, but we already have it" log messages
  5910. from warning to info, except when we're a dirauth. Fixes bug 5238;
  5911. bugfix on
  5912. - Fix the log message describing how we work around discovering
  5913. that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
  5914. 4837; bugfix on
  5915. - When logging about a disallowed .exit name, do not also call it
  5916. an "invalid onion address". Fixes bug 3325; bugfix on
  5917. - Fix a log message suggesting that people contact a non-existent
  5918. email address. Fixes bug 3448.
  5919. - Rephrase the log message emitted if the TestSocks check is
  5920. successful. Patch from Fabian Keil; fixes bug 4094.
  5921. - Log (at debug level) whenever a circuit's purpose is changed.
  5922. - Log SSL state transitions at log level DEBUG, log domain
  5923. HANDSHAKE. This can be useful for debugging censorship events.
  5924. Implements ticket 3264.
  5925. - We now log which torrc file we're using on startup. Implements
  5926. ticket 2444.
  5927. - Rate-limit log messages when asked to connect anonymously to
  5928. a private address. When these hit, they tended to hit fast and
  5929. often. Also, don't bother trying to connect to addresses that we
  5930. are sure will resolve to getting in a directory
  5931. reply makes us think we have been lied to, even when the address the
  5932. client tried to connect to was "localhost." Resolves ticket 2822.
  5933. o Minor bugfixes (log messages, non-client):
  5934. - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
  5935. Fixes bug 5932; bugfix on
  5936. - Don't log that we have "decided to publish new relay descriptor"
  5937. unless we are actually publishing a descriptor. Fixes bug 3942;
  5938. bugfix on
  5939. - Log which authority we're missing votes from when we go to fetch
  5940. them from the other auths.
  5941. - Replace "Sending publish request" log messages with "Launching
  5942. upload", so that they no longer confusingly imply that we're
  5943. sending something to a directory we might not even be connected
  5944. to yet. Fixes bug 3311; bugfix on
  5945. - Warn when Tor is configured to use accounting in a way that can
  5946. link a hidden service to some other hidden service or public
  5947. address. Resolves ticket 6490.
  5948. - Fix a minor formatting issue in one of tor-gencert's error messages.
  5949. Fixes bug 4574.
  5950. o Testing:
  5951. - Update to the latest version of the tinytest unit testing framework.
  5952. This includes a couple of bugfixes that can be relevant for
  5953. running forked unit tests on Windows, and removes all reserved
  5954. identifiers.
  5955. - Avoid a false positive in the util/threads unit test by increasing
  5956. the maximum timeout time. Fixes bug 6227; bugfix on
  5957. - Make it possible to set the TestingTorNetwork configuration
  5958. option using AlternateDirAuthority and AlternateBridgeAuthority
  5959. as an alternative to setting DirServer. Addresses ticket 6377.
  5960. - Add a unit test for the environment_variable_names_equal() function.
  5961. - A wide variety of new unit tests by Esteban Manchado Velázquez.
  5962. - Numerous new unit tests for functions in util.c and address.c by
  5963. Anders Sundman.
  5964. - The long-disabled benchmark tests are now split into their own
  5965. ./src/test/bench binary.
  5966. - The benchmark tests can now use more accurate timers than
  5967. gettimeofday() when such timers are available.
  5968. - Use tt_assert(), not tor_assert(), for checking for test failures.
  5969. This makes the unit tests more able to go on in the event that
  5970. one of them fails.
  5971. o Build improvements:
  5972. - Use the dead_strip option when building Tor on OS X. This reduces
  5973. binary size by almost 19% when linking openssl and libevent
  5974. statically, which we do for Tor Browser Bundle.
  5975. - Provide a better error message about possible OSX Asciidoc failure
  5976. reasons. Fixes bug 6436.
  5977. - Detect attempts to build Tor on (as yet hypothetical) versions
  5978. of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
  5979. fix for bug 4533. Bugfix on
  5980. - On Windows, we now define the _WIN32_WINNT macros only if they
  5981. are not already defined. This lets the person building Tor decide,
  5982. if they want, to require a later version of Windows.
  5983. - Our script now uses autoreconf to launch autoconf,
  5984. automake, and so on. This is more robust against some of the failure
  5985. modes associated with running the autotools pieces on their own.
  5986. - Running "make version" now displays the version of Tor that
  5987. we're about to build. Idea from katmagic; resolves issue 4400.
  5988. - Make 'tor --digests' list hashes of all Tor source files. Bugfix
  5989. on; fixes bug 3427.
  5990. - New --enable-static-tor configure option for building Tor as
  5991. statically as possible. Idea, general hackery and thoughts from
  5992. Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
  5993. 2702.
  5994. - Limited, experimental support for building with nmake and MSVC.
  5995. o Build requirements:
  5996. - Building Tor with bufferevent support now requires Libevent
  5997. 2.0.13-stable or later. Previous versions of Libevent had bugs in
  5998. SSL-related bufferevents and related issues that would make Tor
  5999. work badly with bufferevents. Requiring 2.0.13-stable also allows
  6000. Tor with bufferevents to take advantage of Libevent APIs
  6001. introduced after 2.0.8-rc.
  6002. - Our build system requires automake 1.6 or later to create the
  6003. files. Previously, you could have used 1.4.
  6004. This only affects developers and people building Tor from git;
  6005. people who build Tor from the source distribution without changing
  6006. the files should be fine.
  6007. - Detect when we try to build on a platform that doesn't define
  6008. AF_UNSPEC to 0. We don't work there, so refuse to compile.
  6009. o Build fixes (compile/link):
  6010. - Format more doubles with %f, not %lf. Patch from grarpamp to make
  6011. Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
  6012. Tor
  6013. - When building with --enable-static-tor on OpenBSD, do not
  6014. erroneously attempt to link -lrt. Fixes bug 5103.
  6015. - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
  6016. that IPv6 stuff will compile on MSVC, and compilation issues
  6017. will be easier to track down. Fixes bug 5861.
  6018. - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
  6019. Fixes bug 6379. Bugfix on
  6020. - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
  6021. Fixes bug 6097; bugfix on
  6022. o Build fixes (other):
  6023. - Use the _WIN32 macro throughout our code to detect Windows.
  6024. (Previously we had used the obsolete 'WIN32' and the idiosyncratic
  6025. 'MS_WINDOWS'.)
  6026. - Properly handle the case where the build-tree is not the same
  6027. as the source tree when generating src/common/common_sha1.i,
  6028. src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
  6029. bugfix on
  6030. - During configure, search for library containing cos function as
  6031. libm lives in libcore on some platforms (BeOS/Haiku). Linking
  6032. against libm was hard-coded before. Fixes the first part of bug
  6033. 4727; bugfix on Patch and analysis by Martin Hebnes
  6034. Pedersen.
  6035. - Prevent a false positive from the check-spaces script, by disabling
  6036. the "whitespace between function name and (" check for functions
  6037. named 'op()'.
  6038. o Packaging (RPM) changes:
  6039. - Update our default RPM spec files to work with mock and rpmbuild
  6040. on RHEL/Fedora. They have an updated set of dependencies and
  6041. conflicts, a fix for an ancient typo when creating the "_tor"
  6042. user, and better instructions. Thanks to Ondrej Mikle for the
  6043. patch series. Fixes bug 6043.
  6044. - On OpenSUSE, create the /var/run/tor directory on startup if it
  6045. is not already created. Patch from Andreas Stieger. Fixes bug 2573.
  6046. o Code refactoring (safety):
  6047. - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
  6048. 10 lines. Also, don't nest them. Doing so in the past has
  6049. led to hard-to-debug code. The new style is to use the
  6050. SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
  6051. - Use macros to indicate OpenSSL versions, so we don't need to worry
  6052. about accidental hexadecimal bit shifts.
  6053. - Use tor_sscanf() in place of scanf() in more places through the
  6054. code. This makes us a little more locale-independent, and
  6055. should help shut up code-analysis tools that can't tell
  6056. a safe sscanf string from a dangerous one.
  6057. - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
  6058. - Use the smartlist_add_asprintf() alias more consistently.
  6059. o Code refactoring (consolidate):
  6060. - A major revision to our internal node-selecting and listing logic.
  6061. Tor already had at least two major ways to look at the question of
  6062. "which Tor servers do we know about": a list of router descriptors,
  6063. and a list of entries in the current consensus. With
  6064. microdescriptors, we're adding a third. Having so many systems
  6065. without an abstraction layer over them was hurting the codebase.
  6066. Now, we have a new "node_t" abstraction that presents a consistent
  6067. interface to a client's view of a Tor node, and holds (nearly) all
  6068. of the mutable state formerly in routerinfo_t and routerstatus_t.
  6069. - Move tor_gettimeofday_cached() into compat_libevent.c, and use
  6070. Libevent's notion of cached time when possible.
  6071. - Remove duplicate code for invoking getrlimit() from control.c.
  6072. - Use OpenSSL's built-in SSL_state_string_long() instead of our
  6073. own homebrewed ssl_state_to_string() replacement. Patch from
  6074. Emile Snyder. Fixes bug 4653.
  6075. - Change the symmetric cipher interface so that creating and
  6076. initializing a stream cipher are no longer separate functions.
  6077. o Code refactoring (separate):
  6078. - Make a new "entry connection" struct as an internal subtype of "edge
  6079. connection", to simplify the code and make exit connections smaller.
  6080. - Split connection_about_to_close() into separate functions for each
  6081. connection type.
  6082. - Rewrite the listener-selection logic so that parsing which ports
  6083. we want to listen on is now separate from binding to the ports
  6084. we want.
  6085. o Code refactoring (name changes):
  6086. - Rename a handful of old identifiers, mostly related to crypto
  6087. structures and crypto functions. By convention, our "create an
  6088. object" functions are called "type_new()", our "free an object"
  6089. functions are called "type_free()", and our types indicate that
  6090. they are types only with a final "_t". But a handful of older
  6091. types and functions broke these rules, with function names like
  6092. "type_create" or "subsystem_op_type", or with type names like
  6093. type_env_t.
  6094. - Rename Tor functions that turn strings into addresses, so that
  6095. "parse" indicates that no hostname resolution occurs, and
  6096. "lookup" indicates that hostname resolution may occur. This
  6097. should help prevent mistakes in the future. Fixes bug 3512.
  6098. - Use the name "CERTS" consistently to refer to the new cell type;
  6099. we were calling it CERT in some places and CERTS in others.
  6100. - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
  6101. invalid value, rather than just -1.
  6102. - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
  6103. can pick them up when the tests aren't disabled. Bugfix on
  6104. which introduced tinytest.
  6105. o Code refactoring (other):
  6106. - Defensively refactor rend_mid_rendezvous() so that protocol
  6107. violations and length checks happen in the beginning. Fixes
  6108. bug 5645.
  6109. - Remove the pure attribute from all functions that used it
  6110. previously. In many cases we assigned it incorrectly, because the
  6111. functions might assert or call impure functions, and we don't have
  6112. evidence that keeping the pure attribute is worthwhile. Implements
  6113. changes suggested in ticket 4421.
  6114. - Move the replay-detection cache for the RSA-encrypted parts of
  6115. INTRODUCE2 cells to the introduction point data structures.
  6116. Previously, we would use one replay-detection cache per hidden
  6117. service. Required by fix for bug 3460.
  6118. - The helper programs tor-gencert, tor-resolve, and tor-checkkey
  6119. no longer link against Libevent: they never used it, but
  6120. our library structure used to force them to link it.
  6121. o Removed features and files:
  6122. - Remove all internal support for unpadded RSA. We never used it, and
  6123. it would be a bad idea to start.
  6124. - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
  6125. supported).
  6126. - Remove some redundant #include directives throughout the code.
  6127. Patch from Andrea Gelmini.
  6128. - Remove some old code to remember statistics about which descriptors
  6129. we've served as a directory mirror. The feature wasn't used and
  6130. is outdated now that microdescriptors are around.
  6131. - Remove some old code to work around even older versions of Tor that
  6132. used forked processes to handle DNS requests. Such versions of Tor
  6133. are no longer in use as relays.
  6134. - The "torify" script no longer supports the "tsocks" socksifier
  6135. tool, since tsocks doesn't support DNS and UDP right for Tor.
  6136. Everyone should be using torsocks instead. Fixes bugs 3530 and
  6137. 5180. Based on a patch by "ugh".
  6138. - Remove the torrc.bridge file: we don't use it for anything, and
  6139. it had become badly desynchronized from torrc.sample. Resolves
  6140. bug 5622.
  6141. o Documentation:
  6142. - Begin a doc/state-contents.txt file to explain the contents of
  6143. the Tor state file. Fixes bug 2987.
  6144. - Clarify the documentation for the Alternate*Authority options.
  6145. Fixes bug 6387.
  6146. - Document the --defaults-torrc option, and the new semantics for
  6147. overriding, extending, and clearing lists of options. Closes
  6148. bug 4748.
  6149. - Add missing man page documentation for consensus and microdesc
  6150. files. Resolves ticket 6732.
  6151. - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
  6152. o Documentation fixes:
  6153. - Improve the manual's documentation for the NT Service command-line
  6154. options. Addresses ticket 3964.
  6155. - Clarify SessionGroup documentation slightly; resolves ticket 5437.
  6156. - Document the changes to the ORPort and DirPort options, and the
  6157. fact that {OR/Dir}ListenAddress is now unnecessary (and
  6158. therefore deprecated). Resolves ticket 5597.
  6159. - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
  6160. - Clarify that hidden services are TCP only. Fixes bug 6024.
  6161. Changes in version - 2012-09-11
  6162. Tor fixes two more opportunities for remotely triggerable
  6163. assertions.
  6164. o Security fixes:
  6165. - Fix an assertion failure in tor_timegm() that could be triggered
  6166. by a badly formatted directory object. Bug found by fuzzing with
  6167. Radamsa. Fixes bug 6811; bugfix on
  6168. - Do not crash when comparing an address with port value 0 to an
  6169. address policy. This bug could have been used to cause a remote
  6170. assertion failure by or against directory authorities, or to
  6171. allow some applications to crash clients. Fixes bug 6690; bugfix
  6172. on
  6173. Changes in version - 2012-08-12
  6174. Tor fixes a remotely triggerable crash bug, and fixes a timing
  6175. attack that could in theory leak path information.
  6176. o Security fixes:
  6177. - Avoid an uninitialized memory read when reading a vote or consensus
  6178. document that has an unrecognized flavor name. This read could
  6179. lead to a remote crash bug. Fixes bug 6530; bugfix on
  6180. - Try to leak less information about what relays a client is
  6181. choosing to a side-channel attacker. Previously, a Tor client would
  6182. stop iterating through the list of available relays as soon as it
  6183. had chosen one, thus finishing a little earlier when it picked
  6184. a router earlier in the list. If an attacker can recover this
  6185. timing information (nontrivial but not proven to be impossible),
  6186. they could learn some coarse-grained information about which relays
  6187. a client was picking (middle nodes in particular are likelier to
  6188. be affected than exits). The timing attack might be mitigated by
  6189. other factors (see bug 6537 for some discussion), but it's best
  6190. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  6191. Changes in version - 2012-06-06
  6192. Tor introduces a workaround for a critical renegotiation
  6193. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  6194. currently).
  6195. o Major bugfixes:
  6196. - Work around a bug in OpenSSL that broke renegotiation with TLS
  6197. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  6198. the v2 Tor connection protocol when both sides were using OpenSSL
  6199. 1.0.1 would fail. Resolves ticket 6033.
  6200. - When waiting for a client to renegotiate, don't allow it to add
  6201. any bytes to the input buffer. This fixes a potential DoS issue.
  6202. Fixes bugs 5934 and 6007; bugfix on
  6203. - Fix an edge case where if we fetch or publish a hidden service
  6204. descriptor, we might build a 4-hop circuit and then use that circuit
  6205. for exiting afterwards -- even if the new last hop doesn't obey our
  6206. ExitNodes config option. Fixes bug 5283; bugfix on
  6207. o Minor bugfixes:
  6208. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  6209. Fixes bug 5969. Bugfix on
  6210. o Minor features:
  6211. - Tell GCC and Clang to check for any errors in format strings passed
  6212. to the tor_v*(print|scan)f functions.
  6213. Changes in version - 2012-05-24
  6214. Tor updates the addresses for two of the eight directory
  6215. authorities, fixes some potential anonymity and security issues,
  6216. and fixes several crash bugs.
  6217. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
  6218. known flaws, and nobody should be using them. You should upgrade. If
  6219. you're using a Linux or BSD and its packages are obsolete, stop using
  6220. those packages and upgrade anyway.
  6221. o Directory authority changes:
  6222. - Change IP address for maatuska (v3 directory authority).
  6223. - Change IP address for ides (v3 directory authority), and rename
  6224. it to turtles.
  6225. o Security fixes:
  6226. - When building or running with any version of OpenSSL earlier
  6227. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  6228. versions have a bug (CVE-2011-4576) in which their block cipher
  6229. padding includes uninitialized data, potentially leaking sensitive
  6230. information to any peer with whom they make a SSLv3 connection. Tor
  6231. does not use SSL v3 by default, but a hostile client or server
  6232. could force an SSLv3 connection in order to gain information that
  6233. they shouldn't have been able to get. The best solution here is to
  6234. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  6235. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  6236. to make sure that the bug can't happen.
  6237. - Never use a bridge or a controller-supplied node as an exit, even
  6238. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  6239. 5342. Bugfix on (for controller-purpose descriptors)
  6240. and (for bridge-purpose descriptors).
  6241. - Only build circuits if we have a sufficient threshold of the total
  6242. descriptors that are marked in the consensus with the "Exit"
  6243. flag. This mitigates an attack proposed by wanoskarnet, in which
  6244. all of a client's bridges collude to restrict the exit nodes that
  6245. the client knows about. Fixes bug 5343.
  6246. - Provide controllers with a safer way to implement the cookie
  6247. authentication mechanism. With the old method, if another locally
  6248. running program could convince a controller that it was the Tor
  6249. process, then that program could trick the controller into telling
  6250. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  6251. authentication method uses a challenge-response approach to prevent
  6252. this attack. Fixes bug 5185; implements proposal 193.
  6253. o Major bugfixes:
  6254. - Avoid logging uninitialized data when unable to decode a hidden
  6255. service descriptor cookie. Fixes bug 5647; bugfix on
  6256. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  6257. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  6259. - Fix builds when the path to sed, openssl, or sha1sum contains
  6260. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  6261. on
  6262. - Correct our replacements for the timeradd() and timersub() functions
  6263. on platforms that lack them (for example, Windows). The timersub()
  6264. function is used when expiring circuits, while timeradd() is
  6265. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  6266. bugfix on
  6267. - Fix the SOCKET_OK test that we use to tell when socket
  6268. creation fails so that it works on Win64. Fixes part of bug 4533;
  6269. bugfix on Bug found by wanoskarnet.
  6270. o Minor bugfixes:
  6271. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  6272. Fixes bug 5346; bugfix on 0.0.8pre3.
  6273. - Make our number-parsing functions always treat too-large values
  6274. as an error, even when those values exceed the width of the
  6275. underlying type. Previously, if the caller provided these
  6276. functions with minima or maxima set to the extreme values of the
  6277. underlying integer type, these functions would return those
  6278. values on overflow rather than treating overflow as an error.
  6279. Fixes part of bug 5786; bugfix on 0.0.9.
  6280. - Older Linux kernels erroneously respond to strange nmap behavior
  6281. by having accept() return successfully with a zero-length
  6282. socket. When this happens, just close the connection. Previously,
  6283. we would try harder to learn the remote address: but there was
  6284. no such remote address to learn, and our method for trying to
  6285. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  6286. on Reported and diagnosed by "r1eo".
  6287. - Correct parsing of certain date types in parse_http_time().
  6288. Without this patch, If-Modified-Since would behave
  6289. incorrectly. Fixes bug 5346; bugfix on Patch from
  6290. Esteban Manchado Velázques.
  6291. - Change the BridgePassword feature (part of the "bridge community"
  6292. design, which is not yet implemented) to use a time-independent
  6293. comparison. The old behavior might have allowed an adversary
  6294. to use timing to guess the BridgePassword value. Fixes bug 5543;
  6295. bugfix on
  6296. - Detect and reject certain misformed escape sequences in
  6297. configuration values. Previously, these values would cause us
  6298. to crash if received in a torrc file or over an authenticated
  6299. control port. Bug found by Esteban Manchado Velázquez, and
  6300. independently by Robert Connolly from Matta Consulting who further
  6301. noted that it allows a post-authentication heap overflow. Patch
  6302. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  6303. bugfix on
  6304. - Fix a compile warning when using the --enable-openbsd-malloc
  6305. configure option. Fixes bug 5340; bugfix on
  6306. - During configure, detect when we're building with clang version
  6307. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  6308. CFLAGS. clang doesn't support them yet.
  6309. - When sending an HTTP/1.1 proxy request, include a Host header.
  6310. Fixes bug 5593; bugfix on
  6311. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
  6312. command. Found by mikeyc. Fixes bug 5796; bugfix on
  6313. - If we hit the error case where routerlist_insert() replaces an
  6314. existing (old) server descriptor, make sure to remove that
  6315. server descriptor from the old_routers list. Fix related to bug
  6316. 1776. Bugfix on
  6317. o Minor bugfixes (documentation and log messages):
  6318. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  6319. Fixes bug 4856; bugfix on Tor 0.0.6.
  6320. - Update "ClientOnly" man page entry to explain that there isn't
  6321. really any point to messing with it. Resolves ticket 5005.
  6322. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  6323. directory authority option (introduced in Tor
  6324. - Downgrade the "We're missing a certificate" message from notice
  6325. to info: people kept mistaking it for a real problem, whereas it
  6326. is seldom the problem even when we are failing to bootstrap. Fixes
  6327. bug 5067; bugfix on
  6328. - Correctly spell "connect" in a log message on failure to create a
  6329. controlsocket. Fixes bug 4803; bugfix on
  6330. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  6331. circuits. Fixes issue 5259.
  6332. o Minor features:
  6333. - Directory authorities now reject versions of Tor older than
  6334., and Tor versions between and
  6335. inclusive. These versions accounted for only a small fraction of
  6336. the Tor network, and have numerous known security issues. Resolves
  6337. issue 4788.
  6338. - Update to the May 1 2012 Maxmind GeoLite Country database.
  6339. - Feature removal:
  6340. - When sending or relaying a RELAY_EARLY cell, we used to convert
  6341. it to a RELAY cell if the connection was using the v1 link
  6342. protocol. This was a workaround for older versions of Tor, which
  6343. didn't handle RELAY_EARLY cells properly. Now that all supported
  6344. versions can handle RELAY_EARLY cells, and now that we're enforcing
  6345. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  6346. remove this workaround. Addresses bug 4786.
  6347. Changes in version - 2011-12-16
  6348. Tor fixes a critical heap-overflow security issue in Tor's
  6349. buffers code. Absolutely everybody should upgrade.
  6350. The bug relied on an incorrect calculation when making data continuous
  6351. in one of our IO buffers, if the first chunk of the buffer was
  6352. misaligned by just the wrong amount. The miscalculation would allow an
  6353. attacker to overflow a piece of heap-allocated memory. To mount this
  6354. attack, the attacker would need to either open a SOCKS connection to
  6355. Tor's SocksPort (usually restricted to localhost), or target a Tor
  6356. instance configured to make its connections through a SOCKS proxy
  6357. (which Tor does not do by default).
  6358. Good security practice requires that all heap-overflow bugs should be
  6359. presumed to be exploitable until proven otherwise, so we are treating
  6360. this as a potential code execution attack. Please upgrade immediately!
  6361. This bug does not affect bufferevents-based builds of Tor. Special
  6362. thanks to "Vektor" for reporting this issue to us!
  6363. Tor also fixes several bugs in previous versions, including
  6364. crash bugs for unusual configurations, and a long-term bug that
  6365. would prevent Tor from starting on Windows machines with draconian
  6366. AV software.
  6367. With this release, we remind everyone that 0.2.0.x has reached its
  6368. formal end-of-life. Those Tor versions have many known flaws, and
  6369. nobody should be using them. You should upgrade -- ideally to the
  6370. 0.2.2.x series. If you're using a Linux or BSD and its packages are
  6371. obsolete, stop using those packages and upgrade anyway.
  6372. The Tor 0.2.1.x series is also approaching its end-of-life: it will no
  6373. longer receive support after some time in early 2012.
  6374. o Major bugfixes:
  6375. - Fix a heap overflow bug that could occur when trying to pull
  6376. data into the first chunk of a buffer, when that chunk had
  6377. already had some data drained from it. Fixes CVE-2011-2778;
  6378. bugfix on Reported by "Vektor".
  6379. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  6380. that it doesn't attempt to allocate a socketpair. This could cause
  6381. some problems on Windows systems with overzealous firewalls. Fix for
  6382. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  6383. 2.0.15-stable.
  6384. - If we mark an OR connection for close based on a cell we process,
  6385. don't process any further cells on it. We already avoid further
  6386. reads on marked-for-close connections, but now we also discard the
  6387. cells we'd already read. Fixes bug 4299; bugfix on,
  6388. which was the first version where we might mark a connection for
  6389. close based on processing a cell on it.
  6390. - Correctly sanity-check that we don't underflow on a memory
  6391. allocation (and then assert) for hidden service introduction
  6392. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  6393. bugfix on
  6394. - Fix a memory leak when we check whether a hidden service
  6395. descriptor has any usable introduction points left. Fixes bug
  6396. 4424. Bugfix on
  6397. - Don't crash when we're running as a relay and don't have a GeoIP
  6398. file. Bugfix on; fixes bug 4340. This backports a fix
  6399. we've had in the 0.2.3.x branch already.
  6400. - When running as a client, do not print a misleading (and plain
  6401. wrong) log message that we're collecting "directory request"
  6402. statistics: clients don't collect statistics. Also don't create a
  6403. useless (because empty) stats file in the stats/ directory. Fixes
  6404. bug 4353; bugfix on
  6405. o Minor bugfixes:
  6406. - Detect failure to initialize Libevent. This fix provides better
  6407. detection for future instances of bug 4457.
  6408. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  6409. function. This was eating up hideously large amounts of time on some
  6410. busy servers. Fixes bug 4518; bugfix on
  6411. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  6412. Fixes bug 4230; bugfix on Tor Based on a patch by
  6413. Mansour Moufid.
  6414. - Don't warn about unused log_mutex in log.c when building with
  6415. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  6416. which introduced --disable-threads.
  6417. - When configuring, starting, or stopping an NT service, stop
  6418. immediately after the service configuration attempt has succeeded
  6419. or failed. Fixes bug 3963; bugfix on
  6420. - When sending a NETINFO cell, include the original address
  6421. received for the other side, not its canonical address. Found
  6422. by "troll_un"; fixes bug 4349; bugfix on
  6423. - Fix a typo in a hibernation-related log message. Fixes bug 4331;
  6424. bugfix on; found by "tmpname0901".
  6425. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  6426. occurred when a client tried to fetch a descriptor for a bridge
  6427. in ExcludeNodes. Fixes bug 4383; bugfix on
  6428. - Backport fixes for a pair of compilation warnings on Windows.
  6429. Fixes bug 4521; bugfix on and on
  6430. - If we had ever tried to call tor_addr_to_str on an address of
  6431. unknown type, we would have done a strdup on an uninitialized
  6432. buffer. Now we won't. Fixes bug 4529; bugfix on
  6433. Reported by "troll_un".
  6434. - Correctly detect and handle transient lookup failures from
  6435. tor_addr_lookup. Fixes bug 4530; bugfix on
  6436. Reported by "troll_un".
  6437. - Fix null-pointer access that could occur if TLS allocation failed.
  6438. Fixes bug 4531; bugfix on Found by "troll_un".
  6439. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  6440. 4535; bugfix on Found by "troll_un".
  6441. o Minor features:
  6442. - Add two new config options for directory authorities:
  6443. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  6444. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  6445. that is always sufficient to satisfy the bandwidth requirement for
  6446. the Guard flag. Now it will be easier for researchers to simulate
  6447. Tor networks with different values. Resolves ticket 4484.
  6448. - When Tor ignores a hidden service specified in its configuration,
  6449. include the hidden service's directory in the warning message.
  6450. Previously, we would only tell the user that some hidden service
  6451. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  6452. - Update to the December 6 2011 Maxmind GeoLite Country database.
  6453. o Packaging changes:
  6454. - Make it easier to automate expert package builds on Windows,
  6455. by removing an absolute path from makensis.exe command.
  6456. Changes in version - 2011-12-16
  6457. Tor backports important security and privacy fixes for
  6458. oldstable. This release is intended only for package maintainers and
  6459. others who cannot use the 0.2.2 stable series. All others should be
  6460. using Tor 0.2.2.x or newer.
  6461. The Tor 0.2.1