ReleaseNotes 709 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 - 2016-10-17
  5. Tor backports a fix for a security hole in previous versions
  6. of Tor that would allow a remote attacker to crash a Tor client,
  7. hidden service, relay, or authority. All Tor users should upgrade to
  8. this version, or to Patches will be released for older
  9. versions of Tor.
  10. o Major features (security fixes, also in
  11. - Prevent a class of security bugs caused by treating the contents
  12. of a buffer chunk as if they were a NUL-terminated string. At
  13. least one such bug seems to be present in all currently used
  14. versions of Tor, and would allow an attacker to remotely crash
  15. most Tor instances, especially those compiled with extra compiler
  16. hardening. With this defense in place, such bugs can't crash Tor,
  17. though we should still fix them as they occur. Closes ticket
  18. 20384 (TROVE-2016-10-001).
  19. o Minor features (geoip):
  20. - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
  21. Country database.
  22. Changes in version - 2016-09-23
  23. Tor fixes two crash bugs present in previous versions of the
  24. 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
  25. who select public relays as their bridges.
  26. o Major bugfixes (crash):
  27. - Fix a complicated crash bug that could affect Tor clients
  28. configured to use bridges when replacing a networkstatus consensus
  29. in which one of their bridges was mentioned. OpenBSD users saw
  30. more crashes here, but all platforms were potentially affected.
  31. Fixes bug 20103; bugfix on
  32. o Major bugfixes (relay, OOM handler):
  33. - Fix a timing-dependent assertion failure that could occur when we
  34. tried to flush from a circuit after having freed its cells because
  35. of an out-of-memory condition. Fixes bug 20203; bugfix on
  36. Thanks to "cypherpunks" for help diagnosing
  37. this one.
  38. o Minor feature (fallback directories):
  39. - Remove broken fallbacks from the hard-coded fallback directory
  40. list. Closes ticket 20190; patch by teor.
  41. o Minor features (geoip):
  42. - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
  43. Country database.
  44. Changes in version - 2016-08-24
  45. Tor fixes an important bug related to the ReachableAddresses
  46. option in, and replaces a retiring bridge authority. Everyone
  47. who sets the ReachableAddresses option, and all bridges, are strongly
  48. encouraged to upgrade.
  49. o Directory authority changes:
  50. - The "Tonga" bridge authority has been retired; the new bridge
  51. authority is "Bifroest". Closes tickets 19728 and 19690.
  52. o Major bugfixes (client, security):
  53. - Only use the ReachableAddresses option to restrict the first hop
  54. in a path. In earlier versions of 0.2.8.x, it would apply to
  55. every hop in the path, with a possible degradation in anonymity
  56. for anyone using an uncommon ReachableAddress setting. Fixes bug
  57. 19973; bugfix on
  58. o Minor features (geoip):
  59. - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
  60. Country database.
  61. o Minor bugfixes (compilation):
  62. - Remove an inappropriate "inline" in tortls.c that was causing
  63. warnings on older versions of GCC. Fixes bug 19903; bugfix
  64. on
  65. o Minor bugfixes (fallback directories):
  66. - Avoid logging a NULL string pointer when loading fallback
  67. directory information. Fixes bug 19947; bugfix on
  68. and Report and patch by "rubiate".
  69. Changes in version - 2016-08-02
  70. Tor is the first stable version of the Tor 0.2.8 series.
  71. The Tor 0.2.8 series improves client bootstrapping performance,
  72. completes the authority-side implementation of improved identity
  73. keys for relays, and includes numerous bugfixes and performance
  74. improvements throughout the program. This release continues to
  75. improve the coverage of Tor's test suite. For a full list of
  76. changes since Tor 0.2.7, see the ReleaseNotes file.
  77. Below is a list of the changes since Tor 0.2.7.
  78. o New system requirements:
  79. - Tor no longer attempts to support platforms where the "time_t"
  80. type is unsigned. (To the best of our knowledge, only OpenVMS does
  81. this, and Tor has never actually built on OpenVMS.) Closes
  82. ticket 18184.
  83. - Tor no longer supports versions of OpenSSL with a broken
  84. implementation of counter mode. (This bug was present in OpenSSL
  85. 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
  86. longer runs with, these versions.
  87. - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
  88. later (released in 2008 and 2009 respectively). If you are
  89. building Tor from the git repository instead of from the source
  90. distribution, and your tools are older than this, you will need to
  91. upgrade. Closes ticket 17732.
  92. o Directory authority changes:
  93. - Update the V3 identity key for the dannenberg directory authority:
  94. it was changed on 18 November 2015. Closes task 17906. Patch
  95. by teor.
  96. - Urras is no longer a directory authority. Closes ticket 19271.
  97. o Major features (directory system):
  98. - Include a trial list of default fallback directories, based on an
  99. opt-in survey of suitable relays. Doing this should make clients
  100. bootstrap more quickly and reliably, and reduce the load on the
  101. directory authorities. Closes ticket 15775. Patch by teor.
  102. Candidates identified using an OnionOO script by weasel, teor,
  103. gsathya, and karsten.
  104. - Previously only relays that explicitly opened a directory port
  105. (DirPort) accepted directory requests from clients. Now all
  106. relays, with and without a DirPort, accept and serve tunneled
  107. directory requests that they receive through their ORPort. You can
  108. disable this behavior using the new DirCache option. Closes
  109. ticket 12538.
  110. - When bootstrapping multiple consensus downloads at a time, use the
  111. first one that starts downloading, and close the rest. This
  112. reduces failures when authorities or fallback directories are slow
  113. or down. Together with the code for feature 15775, this feature
  114. should reduces failures due to fallback churn. Implements ticket
  115. 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
  116. mikeperry and teor.
  117. o Major features (security, Linux):
  118. - When Tor starts as root on Linux and is told to switch user ID, it
  119. can now retain the capability to bind to low ports. By default,
  120. Tor will do this only when it's switching user ID and some low
  121. ports have been configured. You can change this behavior with the
  122. new option KeepBindCapabilities. Closes ticket 8195.
  123. o Major bugfixes (client, bootstrapping):
  124. - Check if bootstrap consensus downloads are still needed when the
  125. linked connection attaches. This prevents tor making unnecessary
  126. begindir-style connections, which are the only directory
  127. connections tor clients make since the fix for 18483 was merged.
  128. - Fix some edge cases where consensus download connections may not
  129. have been closed, even though they were not needed. Related to fix
  130. for 18809.
  131. - Make relays retry consensus downloads the correct number of times,
  132. rather than the more aggressive client retry count. Fixes part of
  133. ticket 18809.
  134. o Major bugfixes (dns proxy mode, crash):
  135. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  136. bugfix on Patch from "cypherpunks".
  137. o Major bugfixes (ed25519, voting):
  138. - Actually enable support for authorities to match routers by their
  139. Ed25519 identities. Previously, the code had been written, but
  140. some debugging code that had accidentally been left in the
  141. codebase made it stay turned off. Fixes bug 17702; bugfix
  142. on
  143. - When collating votes by Ed25519 identities, authorities now
  144. include a "NoEdConsensus" flag if the ed25519 value (or lack
  145. thereof) for a server does not reflect the majority consensus.
  146. Related to bug 17668; bugfix on
  147. - When generating a vote with keypinning disabled, never include two
  148. entries for the same ed25519 identity. This bug was causing
  149. authorities to generate votes that they could not parse when a
  150. router violated key pinning by changing its RSA identity but
  151. keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
  152. 18318. Bugfix on
  153. o Major bugfixes (key management):
  154. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  155. pointer to the previous (uninitialized) key value. The impact here
  156. should be limited to a difficult-to-trigger crash, if OpenSSL is
  157. running an engine that makes key generation failures possible, or
  158. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  159. Found by Yuan Jochen Kang, Suman Jana, and
  160. Baishakhi Ray.
  161. o Major bugfixes (security, client, DNS proxy):
  162. - Stop a crash that could occur when a client running with DNSPort
  163. received a query with multiple address types, and the first
  164. address type was not supported. Found and fixed by Scott Dial.
  165. Fixes bug 18710; bugfix on
  166. o Major bugfixes (security, compilation):
  167. - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
  168. is predefined. Previously, our use of -D_FORTIFY_SOURCE would
  169. cause a compiler warning, thereby making other checks fail, and
  170. needlessly disabling compiler-hardening support. Fixes one case of
  171. bug 18841; bugfix on Patch from "trudokal".
  172. - Repair hardened builds under the clang compiler. Previously, our
  173. use of _FORTIFY_SOURCE would conflict with clang's address
  174. sanitizer. Fixes bug 14821; bugfix on
  175. o Major bugfixes (security, pointers):
  176. - Avoid a difficult-to-trigger heap corruption attack when extending
  177. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  178. bugfix on, which fixed a related bug incompletely.
  179. Reported by Guido Vranken.
  180. o Major bugfixes (testing):
  181. - Fix a bug that would block 'make test-network-all' on systems where
  182. IPv6 packets were lost. Fixes bug 19008; bugfix on
  183. o Major bugfixes (user interface):
  184. - Correctly give a warning in the cases where a relay is specified
  185. by nickname, and one such relay is found, but it is not officially
  186. Named. Fixes bug 19203; bugfix on
  187. o Minor features (accounting):
  188. - Added two modes to the AccountingRule option: One for limiting
  189. only the number of bytes sent ("AccountingRule out"), and one for
  190. limiting only the number of bytes received ("AccountingRule in").
  191. Closes ticket 15989; patch from "unixninja92".
  192. o Minor features (bug-resistance):
  193. - Make Tor survive errors involving connections without a
  194. corresponding event object. Previously we'd fail with an
  195. assertion; now we produce a log message. Related to bug 16248.
  196. - Use tor_snprintf() and tor_vsnprintf() even in external and low-
  197. level code, to harden against accidental failures to NUL-
  198. terminate. Part of ticket 17852. Patch from jsturgix. Found
  199. with Flawfinder.
  200. o Minor features (build):
  201. - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
  202. as having possible IPFW support. Closes ticket 18448. Patch from
  203. Steven Chamberlain.
  204. - Since our build process now uses "make distcheck", we no longer
  205. force "make dist" to depend on "make check". Closes ticket 17893;
  206. patch from "cypherpunks".
  207. - Tor now builds once again with the recent OpenSSL 1.1 development
  208. branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
  209. tracking OpenSSL 1.1 development as it has progressed, and fixing
  210. numerous compatibility issues as they arose. See tickets
  211. 17549, 17921, 17984, 19499, and 18286.
  212. - When building manual pages, set the timezone to "UTC", so that the
  213. output is reproducible. Fixes bug 19558; bugfix on
  214. Patch from intrigeri.
  215. o Minor features (clients):
  216. - Make clients, onion services, and bridge relays always use an
  217. encrypted begindir connection for directory requests. Resolves
  218. ticket 18483. Patch by teor.
  219. o Minor features (controller):
  220. - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
  221. controllers can examine the the reject rules added by
  222. ExitPolicyRejectPrivate. This makes it easier for stem to display
  223. exit policies.
  224. - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
  225. tickets 16774 and 17817. Patch by George Tankersley.
  226. - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
  227. service descriptor from a service's local hidden service
  228. descriptor cache. Closes ticket 14846.
  229. o Minor features (crypto):
  230. - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
  231. - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
  232. George Tankersley.
  233. - Improve performance when hashing non-multiple of 8 sized buffers,
  234. based on Andrew Moon's public domain SipHash-2-4 implementation.
  235. Fixes bug 17544; bugfix on
  236. - Validate the hard-coded Diffie-Hellman parameters and ensure that
  237. p is a safe prime, and g is a suitable generator. Closes
  238. ticket 18221.
  239. - When allocating a digest state object, allocate no more space than
  240. we actually need. Previously, we would allocate as much space as
  241. the state for the largest algorithm would need. This change saves
  242. up to 672 bytes per circuit. Closes ticket 17796.
  243. o Minor features (directory downloads):
  244. - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
  245. directory mirrors. The default is 1; set it to 0 to disable
  246. fallbacks. Implements ticket 17576. Patch by teor.
  247. - Wait for busy authorities and fallback directories to become non-
  248. busy when bootstrapping. (A similar change was made in 6c443e987d
  249. for directory caches chosen from the consensus.) Closes ticket
  250. 17864; patch by teor.
  251. o Minor features (geoip):
  252. - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
  253. Country database.
  254. o Minor features (hidden service directory):
  255. - Streamline relay-side hsdir handling: when relays consider whether
  256. to accept an uploaded hidden service descriptor, they no longer
  257. check whether they are one of the relays in the network that is
  258. "supposed" to handle that descriptor. Implements ticket 18332.
  259. o Minor features (IPv6):
  260. - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
  261. to 1, tor prefers IPv6 directory addresses.
  262. - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
  263. avoids using IPv4 for client OR and directory connections.
  264. - Add address policy assume_action support for IPv6 addresses.
  265. - Add an argument 'ipv6=address:orport' to the DirAuthority and
  266. FallbackDir torrc options, to specify an IPv6 address for an
  267. authority or fallback directory. Add hard-coded ipv6 addresses for
  268. directory authorities that have them. Closes ticket 17327; patch
  269. from Nick Mathewson and teor.
  270. - Allow users to configure directory authorities and fallback
  271. directory servers with IPv6 addresses and ORPorts. Resolves
  272. ticket 6027.
  273. - Limit IPv6 mask bits to 128.
  274. - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
  275. 17638; bugfix on 0.0.2pre8. Patch by teor.
  276. - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
  277. "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
  278. "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
  279. - Warn when comparing against an AF_UNSPEC address in a policy, it's
  280. almost always a bug. Closes ticket 17863; patch by teor.
  281. - routerset_parse now accepts IPv6 literal addresses. Fixes bug
  282. 17060; bugfix on Patch by teor.
  283. o Minor features (Linux seccomp2 sandbox):
  284. - Reject attempts to change our Address with "Sandbox 1" enabled.
  285. Changing Address with Sandbox turned on would never actually work,
  286. but previously it would fail in strange and confusing ways. Found
  287. while fixing 18548.
  288. o Minor features (logging):
  289. - When logging to syslog, allow a tag to be added to the syslog
  290. identity (the string prepended to every log message). The tag can
  291. be configured with SyslogIdentityTag and defaults to none. Setting
  292. it to "foo" will cause logs to be tagged as "Tor-foo". Closes
  293. ticket 17194.
  294. o Minor features (portability):
  295. - Use timingsafe_memcmp() where available. Closes ticket 17944;
  296. patch from <>.
  297. o Minor features (relay, address discovery):
  298. - Add a family argument to get_interface_addresses_raw() and
  299. subfunctions to make network interface address interogation more
  300. efficient. Now Tor can specifically ask for IPv4, IPv6 or both
  301. types of interfaces from the operating system. Resolves
  302. ticket 17950.
  303. - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
  304. fails to enumerate interface addresses using the platform-specific
  305. API, have it rely on the UDP socket fallback technique to try and
  306. find out what IP addresses (both IPv4 and IPv6) our machine has.
  307. Resolves ticket 17951.
  308. o Minor features (replay cache):
  309. - The replay cache now uses SHA256 instead of SHA1. Implements
  310. feature 8961. Patch by teor, issue reported by rransom.
  311. o Minor features (robustness):
  312. - Exit immediately with an error message if the code attempts to use
  313. Libevent without having initialized it. This should resolve some
  314. frequently-made mistakes in our unit tests. Closes ticket 18241.
  315. o Minor features (security, clock):
  316. - Warn when the system clock appears to move back in time (when the
  317. state file was last written in the future). Tor doesn't know that
  318. consensuses have expired if the clock is in the past. Patch by
  319. teor. Implements ticket 17188.
  320. o Minor features (security, exit policies):
  321. - ExitPolicyRejectPrivate now rejects more private addresses by
  322. default. Specifically, it now rejects the relay's outbound bind
  323. addresses (if configured), and the relay's configured port
  324. addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
  325. Patch by teor.
  326. o Minor features (security, memory erasure):
  327. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  328. zero size. Check size argument to memwipe() for underflow. Fixes
  329. bug 18089; bugfix on and Reported by "gk",
  330. patch by teor.
  331. - Set the unused entries in a smartlist to NULL. This helped catch
  332. a (harmless) bug, and shouldn't affect performance too much.
  333. Implements ticket 17026.
  334. - Use SecureMemoryWipe() function to securely clean memory on
  335. Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
  336. Implements feature 17986.
  337. - Use explicit_bzero or memset_s when present. Previously, we'd use
  338. OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
  339. from <> and <>.
  340. o Minor features (security, RNG):
  341. - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
  342. positively are not allowed to fail. Previously we depended on
  343. internal details of OpenSSL's behavior. Closes ticket 17686.
  344. - Never use the system entropy output directly for anything besides
  345. seeding the PRNG. When we want to generate important keys, instead
  346. of using system entropy directly, we now hash it with the PRNG
  347. stream. This may help resist certain attacks based on broken OS
  348. entropy implementations. Closes part of ticket 17694.
  349. - Use modern system calls (like getentropy() or getrandom()) to
  350. generate strong entropy on platforms that have them. Closes
  351. ticket 13696.
  352. o Minor features (security, win32):
  353. - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
  354. attack. Fixes bug 18123; bugfix on all tor versions. Patch
  355. by teor.
  356. o Minor features (unix domain sockets):
  357. - Add a new per-socket option, RelaxDirModeCheck, to allow creating
  358. Unix domain sockets without checking the permissions on the parent
  359. directory. (Tor checks permissions by default because some
  360. operating systems only check permissions on the parent directory.
  361. However, some operating systems do look at permissions on the
  362. socket, and tor's default check is unneeded.) Closes ticket 18458.
  363. Patch by weasel.
  364. o Minor features (unix file permissions):
  365. - Defer creation of Unix sockets until after setuid. This avoids
  366. needing CAP_CHOWN and CAP_FOWNER when using systemd's
  367. CapabilityBoundingSet, or chown and fowner when using SELinux.
  368. Implements part of ticket 17562. Patch from Jamie Nguyen.
  369. - If any directory created by Tor is marked as group readable, the
  370. filesystem group is allowed to be either the default GID or the
  371. root user. Allowing root to read the DataDirectory prevents the
  372. need for CAP_READ_SEARCH when using systemd's
  373. CapabilityBoundingSet, or dac_read_search when using SELinux.
  374. Implements part of ticket 17562. Patch from Jamie Nguyen.
  375. - Introduce a new DataDirectoryGroupReadable option. If it is set to
  376. 1, the DataDirectory will be made readable by the default GID.
  377. Implements part of ticket 17562. Patch from Jamie Nguyen.
  378. o Minor bugfixes (accounting):
  379. - The max bandwidth when using 'AccountRule sum' is now correctly
  380. logged. Fixes bug 18024; bugfix on Patch
  381. from "unixninja92".
  382. o Minor bugfixes (assert, portability):
  383. - Fix an assertion failure in memarea.c on systems where "long" is
  384. shorter than the size of a pointer. Fixes bug 18716; bugfix
  385. on
  386. o Minor bugfixes (bootstrap):
  387. - Consistently use the consensus download schedule for authority
  388. certificates. Fixes bug 18816; bugfix on
  389. o Minor bugfixes (build):
  390. - Avoid spurious failures from configure files related to calling
  391. exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18625; bugfix on
  392. Patch from "cypherpunks".
  393. - Do not link the unit tests against both the testing and non-
  394. testing versions of the static libraries. Fixes bug 18490; bugfix
  395. on
  396. - Resolve warnings when building on systems that are concerned with
  397. signed char. Fixes bug 18728; bugfix on
  398. and
  399. - Silence spurious clang-scan warnings in the ed25519_donna code by
  400. explicitly initializing some objects. Fixes bug 18384; bugfix on
  401. Patch by teor.
  402. - When libscrypt.h is found, but no libscrypt library can be linked,
  403. treat libscrypt as absent. Fixes bug 19161; bugfix
  404. on
  405. - Cause the unit tests to compile correctly on mingw64 versions that
  406. lack sscanf. Fixes bug 19213; bugfix on
  407. - Don't try to use the pthread_condattr_setclock() function unless
  408. it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
  409. 17819; bugfix on
  410. - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
  411. on
  412. - Fix search for libevent libraries on OpenBSD (and other systems
  413. that install libevent 1 and libevent 2 in parallel). Fixes bug
  414. 16651; bugfix on Patch from "rubiate".
  415. - Isolate environment variables meant for tests from the rest of the
  416. build system. Fixes bug 17818; bugfix on
  417. - Mark all object files that include micro-revision.i as depending
  418. on it, so as to make parallel builds more reliable. Fixes bug
  419. 17826; bugfix on
  420. - Remove config.log only from make distclean, not from make clean.
  421. Fixes bug 17924; bugfix on
  422. - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
  423. on 0.0.2pre8.
  424. - Remove an #endif from so that we correctly detect the
  425. presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
  426. on
  427. o Minor bugfixes (client, bootstrap):
  428. - Count receipt of new microdescriptors as progress towards
  429. bootstrapping. Previously, with EntryNodes set, Tor might not
  430. successfully repopulate the guard set on bootstrapping. Fixes bug
  431. 16825; bugfix on
  432. o Minor bugfixes (code correctness):
  433. - Fix a bad memory handling bug that would occur if we had queued a
  434. cell on a channel's incoming queue. Fortunately, we can't actually
  435. queue a cell like that as our code is constructed today, but it's
  436. best to avoid this kind of error, even if there isn't any code
  437. that triggers it today. Fixes bug 18570; bugfix on
  438. - Assert that allocated memory held by the reputation code is freed
  439. according to its internal counters. Fixes bug 17753; bugfix
  440. on
  441. - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
  442. bugfix on 0.0.6.
  443. - Update to the latest version of Trunnel, which tries harder to
  444. avoid generating code that can invoke memcpy(p,NULL,0). Bug found
  445. by clang address sanitizer. Fixes bug 18373; bugfix
  446. on
  447. - When closing an entry connection, generate a warning if we should
  448. have sent an end cell for it but we haven't. Fixes bug 17876;
  449. bugfix on
  450. o Minor bugfixes (configuration):
  451. - Fix a tiny memory leak when parsing a port configuration ending in
  452. ":auto". Fixes bug 18374; bugfix on
  453. o Minor bugfixes (containers):
  454. - If we somehow attempt to construct a heap with more than
  455. 1073741822 elements, avoid an integer overflow when maintaining
  456. the heap property. Fixes bug 18296; bugfix on
  457. o Minor bugfixes (controller, microdescriptors):
  458. - Make GETINFO dir/status-vote/current/consensus conform to the
  459. control specification by returning "551 Could not open cached
  460. consensus..." when not caching consensuses. Fixes bug 18920;
  461. bugfix on
  462. o Minor bugfixes (crypto):
  463. - Check the return value of HMAC() and assert on failure. Fixes bug
  464. 17658; bugfix on Patch by teor.
  465. o Minor bugfixes (directories):
  466. - When fetching extrainfo documents, compare their SHA256 digests
  467. and Ed25519 signing key certificates with the routerinfo that led
  468. us to fetch them, rather than with the most recent routerinfo.
  469. Otherwise we generate many spurious warnings about mismatches.
  470. Fixes bug 17150; bugfix on
  471. - When generating a URL for a directory server on an IPv6 address,
  472. wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
  473. on Patch from Malek.
  474. o Minor bugfixes (downloading):
  475. - Predict more correctly whether we'll be downloading over HTTP when
  476. we determine the maximum length of a URL. This should avoid a
  477. "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
  478. bug 19191.
  479. o Minor bugfixes (exit policies, security):
  480. - Refresh an exit relay's exit policy when interface addresses
  481. change. Previously, tor only refreshed the exit policy when the
  482. configured external address changed. Fixes bug 18208; bugfix on
  483. Patch by teor.
  484. o Minor bugfixes (fallback directories):
  485. - Mark fallbacks as "too busy" when they return a 503 response,
  486. rather than just marking authorities. Fixes bug 17572; bugfix on
  487. Patch by teor.
  488. - When requesting extrainfo descriptors from a trusted directory
  489. server, check whether it is an authority or a fallback directory
  490. which supports extrainfo descriptors. Fixes bug 18489; bugfix on
  491. Reported by atagar, patch by teor.
  492. o Minor bugfixes (hidden service, client):
  493. - Handle the case where the user makes several fast consecutive
  494. requests to the same .onion address. Previously, the first six
  495. requests would each trigger a descriptor fetch, each picking a
  496. directory (there are 6 overall) and the seventh one would fail
  497. because no directories were left, thereby triggering a close on
  498. all current directory connections asking for the hidden service.
  499. The solution here is to not close the connections if we have
  500. pending directory fetches. Fixes bug 15937; bugfix
  501. on
  502. o Minor bugfixes (hidden service, control port):
  503. - Add the onion address to the HS_DESC event for the UPLOADED action
  504. both on success or failure. It was previously hardcoded with
  505. UNKNOWN. Fixes bug 16023; bugfix on
  506. o Minor bugfixes (hidden service, directory):
  507. - Bridges now refuse "rendezvous2" (hidden service descriptor)
  508. publish attempts. Suggested by ticket 18332.
  509. o Minor bugfixes (IPv6):
  510. - Update the limits in max_dl_per_request for IPv6 address length.
  511. Fixes bug 17573; bugfix on
  512. o Minor bugfixes (Linux seccomp2 sandbox):
  513. - Allow more syscalls when running with "Sandbox 1" enabled:
  514. sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
  515. some systems, these are required for Tor to start. Fixes bug
  516. 18397; bugfix on Patch from Daniel Pinto.
  517. - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
  518. so that get_interface_address6_via_udp_socket_hack() can work.
  519. Fixes bug 19660; bugfix on
  520. - Allow the setrlimit syscall, and the prlimit and prlimit64
  521. syscalls, which some libc implementations use under the hood.
  522. Fixes bug 15221; bugfix on
  523. - Avoid a 10-second delay when starting as a client with "Sandbox 1"
  524. enabled and no DNS resolvers configured. This should help TAILS
  525. start up faster. Fixes bug 18548; bugfix on
  526. - Fix a crash when using offline master ed25519 keys with the Linux
  527. seccomp2 sandbox enabled. Fixes bug 17675; bugfix on
  528. - Allow statistics to be written to disk when "Sandbox 1" is
  529. enabled. Fixes bugs 19556 and 19957; bugfix on and
  530. respectively.
  531. o Minor bugfixes (logging):
  532. - In log messages that include a function name, use __FUNCTION__
  533. instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
  534. with clang __PRETTY_FUNCTION__ has extra information we don't
  535. need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
  536. der Woerdt.
  537. - Remove needless quotes from a log message about unparseable
  538. addresses. Fixes bug 17843; bugfix on
  539. - Scrub service name in "unrecognized service ID" log messages.
  540. Fixes bug 18600; bugfix on
  541. - When logging information about an unparsable networkstatus vote or
  542. consensus, do not say "vote" when we mean consensus. Fixes bug
  543. 18368; bugfix on
  544. - When we can't generate a signing key because OfflineMasterKey is
  545. set, do not imply that we should have been able to load it. Fixes
  546. bug 18133; bugfix on
  547. - When logging a malformed hostname received through socks4, scrub
  548. it if SafeLogging says we should. Fixes bug 17419; bugfix
  549. on
  550. o Minor bugfixes (memory safety):
  551. - Avoid freeing an uninitialized pointer when opening a socket fails
  552. in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
  553. Reported by toralf and "cypherpunks", patch
  554. by teor.
  555. - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
  556. 18672; bugfix on
  557. - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
  558. on
  559. o Minor bugfixes (pluggable transports):
  560. - Avoid reporting a spurious error when we decide that we don't need
  561. to terminate a pluggable transport because it has already exited.
  562. Fixes bug 18686; bugfix on
  563. o Minor bugfixes (pointer arithmetic):
  564. - Fix a bug in memarea_alloc() that could have resulted in remote
  565. heap write access, if Tor had ever passed an unchecked size to
  566. memarea_alloc(). Fortunately, all the sizes we pass to
  567. memarea_alloc() are pre-checked to be less than 128 kilobytes.
  568. Fixes bug 19150; bugfix on Bug found by
  569. Guido Vranken.
  570. o Minor bugfixes (private directory):
  571. - Prevent a race condition when creating private directories. Fixes
  572. part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
  573. Patch from jsturgix. Found with Flawfinder.
  574. o Minor bugfixes (relays):
  575. - Check that both the ORPort and DirPort (if present) are reachable
  576. before publishing a relay descriptor. Otherwise, relays publish a
  577. descriptor with DirPort 0 when the DirPort reachability test takes
  578. longer than the ORPort reachability test. Fixes bug 18050; bugfix
  579. on Reported by "starlight", patch by teor.
  580. - Resolve some edge cases where we might launch an ORPort
  581. reachability check even when DisableNetwork is set. Noticed while
  582. fixing bug 18616; bugfix on
  583. o Minor bugfixes (relays, hidden services):
  584. - Refuse connection requests to private OR addresses unless
  585. ExtendAllowPrivateAddresses is set. Previously, tor would connect,
  586. then refuse to send any cells to a private address. Fixes bugs
  587. 17674 and 8976; bugfix on Patch by teor.
  588. o Minor bugfixes (security, hidden services):
  589. - Prevent hidden services connecting to client-supplied rendezvous
  590. addresses that are reserved as internal or multicast. Fixes bug
  591. 8976; bugfix on Patch by dgoulet and teor.
  592. o Minor bugfixes (statistics):
  593. - Consistently check for overflow in round_*_to_next_multiple_of
  594. functions, and add unit tests with additional and maximal values.
  595. Fixes part of bug 13192; bugfix on
  596. - Handle edge cases in the laplace functions: avoid division by
  597. zero, avoid taking the log of zero, and silence clang type
  598. conversion warnings using round and trunc. Add unit tests for edge
  599. cases with maximal values. Fixes part of bug 13192; bugfix
  600. on
  601. - We now include consensus downloads via IPv6 in our directory-
  602. request statistics. Fixes bug 18460; bugfix on
  603. o Minor bugfixes (test networks, IPv6):
  604. - Allow internal IPv6 addresses in descriptors in test networks.
  605. Fixes bug 17153; bugfix on Patch by teor, reported
  606. by karsten.
  607. o Minor bugfixes (testing):
  608. - Check the full results of SHA256 and SHA512 digests in the unit
  609. tests. Bugfix on Patch by teor.
  610. - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
  611. on
  612. - Fix a small memory leak that would occur when the
  613. TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
  614. bugfix on
  615. - Make unit tests pass on IPv6-only systems, and systems without
  616. localhost addresses (like some FreeBSD jails). Fixes bug 17632;
  617. bugfix on Patch by teor.
  618. - The test for log_heartbeat was incorrectly failing in timezones
  619. with non-integer offsets. Instead of comparing the end of the time
  620. string against a constant, compare it to the output of
  621. format_local_iso_time when given the correct input. Fixes bug
  622. 18039; bugfix on
  623. - We no longer disable assertions in the unit tests when coverage is
  624. enabled. Instead, we require you to say --disable-asserts-in-tests
  625. to the configure script if you need assertions disabled in the
  626. unit tests (for example, if you want to perform branch coverage).
  627. Fixes bug 18242; bugfix on
  628. o Minor bugfixes (time handling):
  629. - When correcting a corrupt 'struct tm' value, fill in the tm_wday
  630. field. Otherwise, our unit tests crash on Windows. Fixes bug
  631. 18977; bugfix on
  632. - Avoid overflow in tor_timegm when parsing dates in and after 2038
  633. on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
  634. 0.0.2pre14. Patch by teor.
  635. o Minor bugfixes (tor-gencert):
  636. - Correctly handle the case where an authority operator enters a
  637. passphrase but sends an EOF before sending a newline. Fixes bug
  638. 17443; bugfix on Found by junglefowl.
  639. o Code simplification and refactoring:
  640. - Clean up a little duplicated code in
  641. crypto_expand_key_material_TAP(). Closes ticket 17587; patch
  642. from "pfrankw".
  643. - Decouple the list of streams waiting to be attached to circuits
  644. from the overall connection list. This change makes it possible to
  645. attach streams quickly while simplifying Tor's callgraph and
  646. avoiding O(N) scans of the entire connection list. Closes
  647. ticket 17590.
  648. - Extract the more complicated parts of circuit_mark_for_close()
  649. into a new function that we run periodically before circuits are
  650. freed. This change removes more than half of the functions
  651. currently in the "blob". Closes ticket 17218.
  652. - Move logging of redundant policy entries in
  653. policies_parse_exit_policy_internal into its own function. Closes
  654. ticket 17608; patch from "juce".
  655. - Quote all the string interpolations in -- even those
  656. which we are pretty sure can't contain spaces. Closes ticket
  657. 17744. Patch from zerosion.
  658. - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
  659. use them. Closes ticket 17926.
  660. - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
  661. inplace, so there's no need to have a separate implementation for
  662. the non-inplace code. Closes ticket 18258. Patch from Malek.
  663. - Simplify return types for some crypto functions that can't
  664. actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
  665. - When a direct directory request fails immediately on launch,
  666. instead of relaunching that request from inside the code that
  667. launches it, instead mark the connection for teardown. This change
  668. simplifies Tor's callback and prevents the directory-request
  669. launching code from invoking itself recursively. Closes
  670. ticket 17589.
  671. o Documentation:
  672. - Add a description of the correct use of the '--keygen' command-
  673. line option. Closes ticket 17583; based on text by 's7r'.
  674. - Change build messages to refer to "Fedora" instead of "Fedora
  675. Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
  676. Patches from "icanhasaccount" and "cypherpunks".
  677. - Document the contents of the 'datadir/keys' subdirectory in the
  678. manual page. Closes ticket 17621.
  679. - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
  680. - Explain actual minima for BandwidthRate. Closes ticket 16382.
  681. - Fix a minor formatting typo in the manpage. Closes ticket 17791.
  682. - Mention torspec URL in the manpage and point the reader to it
  683. whenever we mention a document that belongs in torspce. Fixes
  684. issue 17392.
  685. - Stop recommending use of nicknames to identify relays in our
  686. MapAddress documentation. Closes ticket 18312.
  687. o Removed features:
  688. - Remove client-side support for connecting to Tor relays running
  689. versions of Tor before These relays didn't support
  690. the v3 TLS handshake protocol, and are no longer allowed on the
  691. Tor network. Implements the client side of ticket 11150. Based on
  692. patches by Tom van der Woerdt.
  693. - We no longer maintain an internal freelist in memarea.c.
  694. Allocators should be good enough to make this code unnecessary,
  695. and it's doubtful that it ever had any performance benefit.
  696. o Testing:
  697. - Add unit tests to check for common RNG failure modes, such as
  698. returning all zeroes, identical values, or incrementing values
  699. (OpenSSL's rand_predictable feature). Patch by teor.
  700. - Always test both ed25519 backends, so that we can be sure that our
  701. batch-open replacement code works. Part of ticket 16794.
  702. - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
  703. portion of ticket 16831.
  704. - Fix several warnings from clang's address sanitizer produced in
  705. the unit tests.
  706. - Log more information when the backtrace tests fail. Closes ticket
  707. 17892. Patch from "cypherpunks."
  708. - More unit tests for compat_libevent.c, procmon.c, tortls.c,
  709. util_format.c, directory.c, and options_validate.c. Closes tickets
  710. 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
  711. Ola Bini.
  712. - Treat backtrace test failures as expected on FreeBSD until we
  713. solve bug 17808. Closes ticket 18204.
  714. - Unit tests for directory_handle_command_get. Closes ticket 17004.
  715. Patch from Reinaldo de Souza Jr.
  716. Changes in version - 2015-12-10
  717. Tor version fixes a major bug in entry guard selection, as
  718. well as a minor bug in hidden service reliability.
  719. o Major bugfixes (guard selection):
  720. - Actually look at the Guard flag when selecting a new directory
  721. guard. When we implemented the directory guard design, we
  722. accidentally started treating all relays as if they have the Guard
  723. flag during guard selection, leading to weaker anonymity and worse
  724. performance. Fixes bug 17772; bugfix on Discovered
  725. by Mohsen Imani.
  726. o Minor features (geoip):
  727. - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
  728. Country database.
  729. o Minor bugfixes (compilation):
  730. - When checking for net/pfvar.h, include netinet/in.h if possible.
  731. This fixes transparent proxy detection on OpenBSD. Fixes bug
  732. 17551; bugfix on Patch from "rubiate".
  733. - Fix a compilation warning with Clang 3.6: Do not check the
  734. presence of an address which can never be NULL. Fixes bug 17781.
  735. o Minor bugfixes (correctness):
  736. - When displaying an IPv6 exit policy, include the mask bits
  737. correctly even when the number is greater than 31. Fixes bug
  738. 16056; bugfix on Patch from "gturner".
  739. - The wrong list was used when looking up expired intro points in a
  740. rend service object, causing what we think could be reachability
  741. issues for hidden services, and triggering a BUG log. Fixes bug
  742. 16702; bugfix on
  743. - Fix undefined behavior in the tor_cert_checksig function. Fixes
  744. bug 17722; bugfix on
  745. Changes in version - 2015-11-20
  746. The Tor 0.2.7 release series is dedicated to the memory of Tor user
  747. and privacy advocate Caspar Bowden (1961-2015). Caspar worked
  748. tirelessly to advocate human rights regardless of national borders,
  749. and oppose the encroachments of mass surveillance. He opposed national
  750. exceptionalism, he brought clarity to legal and policy debates, he
  751. understood and predicted the impact of mass surveillance on the world,
  752. and he laid the groundwork for resisting it. While serving on the Tor
  753. Project's board of directors, he brought us his uncompromising focus
  754. on technical excellence in the service of humankind. Caspar was an
  755. inimitable force for good and a wonderful friend. He was kind,
  756. humorous, generous, gallant, and believed we should protect one
  757. another without exception. We honor him here for his ideals, his
  758. efforts, and his accomplishments. Please honor his memory with works
  759. that would make him proud.
  760. Tor is the first stable release in the Tor 0.2.7 series.
  761. The 0.2.7 series adds a more secure identity key type for relays,
  762. improves cryptography performance, resolves several longstanding
  763. hidden-service performance issues, improves controller support for
  764. hidden services, and includes small bugfixes and performance
  765. improvements throughout the program. This release series also includes
  766. more tests than before, and significant simplifications to which parts
  767. of Tor invoke which others. For a full list of changes, see below.
  768. o New system requirements:
  769. - Tor no longer includes workarounds to support Libevent versions
  770. before 1.3e. Libevent 2.0 or later is recommended. Closes
  771. ticket 15248.
  772. - Tor no longer supports copies of OpenSSL that are missing support
  773. for Elliptic Curve Cryptography. (We began using ECC when
  774. available in, for more safe and efficient key
  775. negotiation.) In particular, support for at least one of P256 or
  776. P224 is now required, with manual configuration needed if only
  777. P224 is available. Resolves ticket 16140.
  778. - Tor no longer supports versions of OpenSSL before 1.0. (If you are
  779. on an operating system that has not upgraded to OpenSSL 1.0 or
  780. later, and you compile Tor from source, you will need to install a
  781. more recent OpenSSL to link Tor against.) These versions of
  782. OpenSSL are still supported by the OpenSSL, but the numerous
  783. cryptographic improvements in later OpenSSL releases makes them a
  784. clear choice. Resolves ticket 16034.
  785. o Major features (controller):
  786. - Add the ADD_ONION and DEL_ONION commands that allow the creation
  787. and management of hidden services via the controller. Closes
  788. ticket 6411.
  789. - New "GETINFO onions/current" and "GETINFO onions/detached"
  790. commands to get information about hidden services created via the
  791. controller. Part of ticket 6411.
  792. - New HSFETCH command to launch a request for a hidden service
  793. descriptor. Closes ticket 14847.
  794. - New HSPOST command to upload a hidden service descriptor. Closes
  795. ticket 3523. Patch by "DonnchaC".
  796. o Major features (Ed25519 identity keys, Proposal 220):
  797. - Add support for offline encrypted Ed25519 master keys. To use this
  798. feature on your tor relay, run "tor --keygen" to make a new master
  799. key (or to make a new signing key if you already have a master
  800. key). Closes ticket 13642.
  801. - All relays now maintain a stronger identity key, using the Ed25519
  802. elliptic curve signature format. This master key is designed so
  803. that it can be kept offline. Relays also generate an online
  804. signing key, and a set of other Ed25519 keys and certificates.
  805. These are all automatically regenerated and rotated as needed.
  806. Implements part of ticket 12498.
  807. - Directory authorities now vote on Ed25519 identity keys along with
  808. RSA1024 keys. Implements part of ticket 12498.
  809. - Directory authorities track which Ed25519 identity keys have been
  810. used with which RSA1024 identity keys, and do not allow them to
  811. vary freely. Implements part of ticket 12498.
  812. - Microdescriptors now include Ed25519 identity keys. Implements
  813. part of ticket 12498.
  814. - Add a --newpass option to allow changing or removing the
  815. passphrase of an encrypted key with tor --keygen. Implements part
  816. of ticket 16769.
  817. - Add a new OfflineMasterKey option to tell Tor never to try loading
  818. or generating a secret Ed25519 identity key. You can use this in
  819. combination with tor --keygen to manage offline and/or encrypted
  820. Ed25519 keys. Implements ticket 16944.
  821. - On receiving a HUP signal, check to see whether the Ed25519
  822. signing key has changed, and reload it if so. Closes ticket 16790.
  823. - Significant usability improvements for Ed25519 key management. Log
  824. messages are better, and the code can recover from far more
  825. failure conditions. Thanks to "s7r" for reporting and diagnosing
  826. so many of these!
  827. o Major features (ECC performance):
  828. - Improve the runtime speed of Ed25519 signature verification by
  829. using Ed25519-donna's batch verification support. Implements
  830. ticket 16533.
  831. - Improve the speed of Ed25519 operations and Curve25519 keypair
  832. generation when built targeting 32 bit x86 platforms with SSE2
  833. available. Implements ticket 16535.
  834. - Improve the runtime speed of Ed25519 operations by using the
  835. public-domain Ed25519-donna by Andrew M. ("floodyberry").
  836. Implements ticket 16467.
  837. - Improve the runtime speed of the ntor handshake by using an
  838. optimized curve25519 basepoint scalarmult implementation from the
  839. public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
  840. ideas by Adam Langley. Implements ticket 9663.
  841. o Major features (Hidden services):
  842. - Hidden services, if using the EntryNodes option, are required to
  843. use more than one EntryNode, in order to avoid a guard discovery
  844. attack. (This would only affect people who had configured hidden
  845. services and manually specified the EntryNodes option with a
  846. single entry-node. The impact was that it would be easy to
  847. remotely identify the guard node used by such a hidden service.
  848. See ticket for more information.) Fixes ticket 14917.
  849. - Add the torrc option HiddenServiceNumIntroductionPoints, to
  850. specify a fixed number of introduction points. Its maximum value
  851. is 10 and default is 3. Using this option can increase a hidden
  852. service's reliability under load, at the cost of making it more
  853. visible that the hidden service is facing extra load. Closes
  854. ticket 4862.
  855. - Remove the adaptive algorithm for choosing the number of
  856. introduction points, which used to change the number of
  857. introduction points (poorly) depending on the number of
  858. connections the HS sees. Closes ticket 4862.
  859. o Major features (onion key cross-certification):
  860. - Relay descriptors now include signatures of their own identity
  861. keys, made using the TAP and ntor onion keys. These signatures
  862. allow relays to prove ownership of their own onion keys. Because
  863. of this change, microdescriptors will no longer need to include
  864. RSA identity keys. Implements proposal 228; closes ticket 12499.
  865. o Major bugfixes (client-side privacy, also in
  866. - Properly separate out each SOCKSPort when applying stream
  867. isolation. The error occurred because each port's session group
  868. was being overwritten by a default value when the listener
  869. connection was initialized. Fixes bug 16247; bugfix on
  870. Patch by "jojelino".
  871. o Major bugfixes (hidden service clients, stability, also in
  872. - Stop refusing to store updated hidden service descriptors on a
  873. client. This reverts commit 9407040c59218 (which indeed fixed bug
  874. 14219, but introduced a major hidden service reachability
  875. regression detailed in bug 16381). This is a temporary fix since
  876. we can live with the minor issue in bug 14219 (it just results in
  877. some load on the network) but the regression of 16381 is too much
  878. of a setback. First-round fix for bug 16381; bugfix
  879. on
  880. o Major bugfixes (hidden services):
  881. - Revert commit that made directory authorities assign the HSDir
  882. flag to relay without a DirPort; this was bad because such relays
  883. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  884. on
  885. - When cannibalizing a circuit for an introduction point, always
  886. extend to the chosen exit node (creating a 4 hop circuit).
  887. Previously Tor would use the current circuit exit node, which
  888. changed the original choice of introduction point, and could cause
  889. the hidden service to skip excluded introduction points or
  890. reconnect to a skipped introduction point. Fixes bug 16260; bugfix
  891. on
  892. o Major bugfixes (memory leaks):
  893. - Fix a memory leak in ed25519 batch signature checking. Fixes bug
  894. 17398; bugfix on
  895. o Major bugfixes (open file limit):
  896. - The open file limit wasn't checked before calling
  897. tor_accept_socket_nonblocking(), which would make Tor exceed the
  898. limit. Now, before opening a new socket, Tor validates the open
  899. file limit just before, and if the max has been reached, return an
  900. error. Fixes bug 16288; bugfix on
  901. o Major bugfixes (security, correctness):
  902. - Fix an error that could cause us to read 4 bytes before the
  903. beginning of an openssl string. This bug could be used to cause
  904. Tor to crash on systems with unusual malloc implementations, or
  905. systems with unusual hardening installed. Fixes bug 17404; bugfix
  906. on
  907. o Major bugfixes (stability, also in
  908. - Stop crashing with an assertion failure when parsing certain kinds
  909. of malformed or truncated microdescriptors. Fixes bug 16400;
  910. bugfix on Found by "torkeln"; fix based on a patch
  911. by "cypherpunks_backup".
  912. - Stop random client-side assertion failures that could occur when
  913. connecting to a busy hidden service, or connecting to a hidden
  914. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  915. on
  916. o Minor features (client, SOCKS):
  917. - Add GroupWritable and WorldWritable options to unix-socket based
  918. SocksPort and ControlPort options. These options apply to a single
  919. socket, and override {Control,Socks}SocketsGroupWritable. Closes
  920. ticket 15220.
  921. - Relax the validation done to hostnames in SOCKS5 requests, and
  922. allow a single trailing '.' to cope with clients that pass FQDNs
  923. using that syntax to explicitly indicate that the domain name is
  924. fully-qualified. Fixes bug 16674; bugfix on
  925. - Relax the validation of hostnames in SOCKS5 requests, allowing the
  926. character '_' to appear, in order to cope with domains observed in
  927. the wild that are serving non-RFC compliant records. Resolves
  928. ticket 16430.
  929. o Minor features (client-side privacy):
  930. - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
  931. lifespan when IsolateSOCKSAuth and streams with SOCKS
  932. authentication are attached to the circuit. This allows
  933. applications like TorBrowser to manage circuit lifetime on their
  934. own. Implements feature 15482.
  935. - When logging malformed hostnames from SOCKS5 requests, respect
  936. SafeLogging configuration. Fixes bug 16891; bugfix on
  937. o Minor features (clock-jump tolerance):
  938. - Recover better when our clock jumps back many hours, like might
  939. happen for Tails or Whonix users who start with a very wrong
  940. hardware clock, use Tor to discover a more accurate time, and then
  941. fix their clock. Resolves part of ticket 8766.
  942. o Minor features (command-line interface):
  943. - Make --hash-password imply --hush to prevent unnecessary noise.
  944. Closes ticket 15542. Patch from "cypherpunks".
  945. - Print a warning whenever we find a relative file path being used
  946. as torrc option. Resolves issue 14018.
  947. o Minor features (compilation):
  948. - Give a warning as early as possible when trying to build with an
  949. unsupported OpenSSL version. Closes ticket 16901.
  950. - Use C99 variadic macros when the compiler is not GCC. This avoids
  951. failing compilations on MSVC, and fixes a log-file-based race
  952. condition in our old workarounds. Original patch from Gisle Vanem.
  953. o Minor features (control protocol):
  954. - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
  955. the control protocol. Resolves ticket 15358.
  956. o Minor features (controller):
  957. - Add DirAuthority lines for default directory authorities to the
  958. output of the "GETINFO config/defaults" command if not already
  959. present. Implements ticket 14840.
  960. - Controllers can now use "GETINFO hs/client/desc/id/..." to
  961. retrieve items from the client's hidden service descriptor cache.
  962. Closes ticket 14845.
  963. - Implement a new controller command "GETINFO status/fresh-relay-
  964. descs" to fetch a descriptor/extrainfo pair that was generated on
  965. demand just for the controller's use. Implements ticket 14784.
  966. o Minor features (directory authorities):
  967. - Directory authorities no longer vote against the "Fast", "Stable",
  968. and "HSDir" flags just because they were going to vote against
  969. "Running": if the consensus turns out to be that the router was
  970. running, then the authority's vote should count. Patch from Peter
  971. Retzlaff; closes issue 8712.
  972. o Minor features (directory authorities, security, also in
  973. - The HSDir flag given by authorities now requires the Stable flag.
  974. For the current network, this results in going from 2887 to 2806
  975. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  976. attack by raising the effort for a relay to become Stable to
  977. require at the very least 7 days, while maintaining the 96 hours
  978. uptime requirement for HSDir. Implements ticket 8243.
  979. o Minor features (DoS-resistance):
  980. - Make it harder for attackers to overload hidden services with
  981. introductions, by blocking multiple introduction requests on the
  982. same circuit. Resolves ticket 15515.
  983. o Minor features (geoip):
  984. - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
  985. Country database.
  986. o Minor features (hidden services):
  987. - Add the new options "HiddenServiceMaxStreams" and
  988. "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
  989. limit the maximum number of simultaneous streams per circuit, and
  990. optionally tear down the circuit when the limit is exceeded. Part
  991. of ticket 16052.
  992. - Client now uses an introduction point failure cache to know when
  993. to fetch or keep a descriptor in their cache. Previously, failures
  994. were recorded implicitly, but not explicitly remembered. Closes
  995. ticket 16389.
  996. - Relays need to have the Fast flag to get the HSDir flag. As this
  997. is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
  998. drop. This change should make some attacks against the hidden
  999. service directory system harder. Fixes ticket 15963.
  1000. - Turn on hidden service statistics collection by setting the torrc
  1001. option HiddenServiceStatistics to "1" by default. (This keeps
  1002. track only of the fraction of traffic used by hidden services, and
  1003. the total number of hidden services in existence.) Closes
  1004. ticket 15254.
  1005. - To avoid leaking HS popularity, don't cycle the introduction point
  1006. when we've handled a fixed number of INTRODUCE2 cells but instead
  1007. cycle it when a random number of introductions is reached, thus
  1008. making it more difficult for an attacker to find out the amount of
  1009. clients that have used the introduction point for a specific HS.
  1010. Closes ticket 15745.
  1011. o Minor features (logging):
  1012. - Include the Tor version in all LD_BUG log messages, since people
  1013. tend to cut and paste those into the bugtracker. Implements
  1014. ticket 15026.
  1015. o Minor features (pluggable transports):
  1016. - When launching managed pluggable transports on Linux systems,
  1017. attempt to have the kernel deliver a SIGTERM on tor exit if the
  1018. pluggable transport process is still running. Resolves
  1019. ticket 15471.
  1020. - When launching managed pluggable transports, setup a valid open
  1021. stdin in the child process that can be used to detect if tor has
  1022. terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
  1023. can be used by implementations to detect this new behavior.
  1024. Resolves ticket 15435.
  1025. o Minor bugfixes (torrc exit policies):
  1026. - In each instance above, usage advice is provided to avoid the
  1027. message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
  1028. 16069; bugfix on
  1029. - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
  1030. produce IPv6 wildcard addresses. Previously they would produce
  1031. both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
  1032. of bug 16069; bugfix on
  1033. - When parsing torrc ExitPolicies, we now issue an info-level
  1034. message when expanding an "accept/reject *" line to include both
  1035. IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
  1036. - When parsing torrc ExitPolicies, we now warn for a number of cases
  1037. where the user's intent is likely to differ from Tor's actual
  1038. behavior. These include: using an IPv4 address with an accept6 or
  1039. reject6 line; using "private" on an accept6 or reject6 line; and
  1040. including any ExitPolicy lines after accept *:* or reject *:*.
  1041. Related to ticket 16069.
  1042. o Minor bugfixes (command-line interface):
  1043. - When "--quiet" is provided along with "--validate-config", do not
  1044. write anything to stdout on success. Fixes bug 14994; bugfix
  1045. on
  1046. - When complaining about bad arguments to "--dump-config", use
  1047. stderr, not stdout.
  1048. - Print usage information for --dump-config when it is used without
  1049. an argument. Also, fix the error message to use different wording
  1050. and add newline at the end. Fixes bug 15541; bugfix
  1051. on
  1052. o Minor bugfixes (compilation):
  1053. - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
  1054. bugfix on Patch from 'jamestk'.
  1055. - Repair compilation with the most recent (unreleased, alpha)
  1056. vesions of OpenSSL 1.1. Fixes part of ticket 17237.
  1057. o Minor bugfixes (compilation, also in
  1058. - Build with --enable-systemd correctly when libsystemd is
  1059. installed, but systemd is not. Fixes bug 16164; bugfix on
  1060. Patch from Peter Palfrader.
  1061. o Minor bugfixes (configuration, unit tests):
  1062. - Only add the default fallback directories when the DirAuthorities,
  1063. AlternateDirAuthority, and FallbackDir directory config options
  1064. are set to their defaults. The default fallback directory list is
  1065. currently empty, this fix will only change tor's behavior when it
  1066. has default fallback directories. Includes unit tests for
  1067. consider_adding_dir_servers(). Fixes bug 15642; bugfix on
  1068. 90f6071d8dc0 in Patch by "teor".
  1069. o Minor bugfixes (controller):
  1070. - Add the descriptor ID in each HS_DESC control event. It was
  1071. missing, but specified in control-spec.txt. Fixes bug 15881;
  1072. bugfix on
  1073. o Minor bugfixes (correctness):
  1074. - For correctness, avoid modifying a constant string in
  1075. handle_control_postdescriptor. Fixes bug 15546; bugfix
  1076. on
  1077. - Remove side-effects from tor_assert() calls. This was harmless,
  1078. because we never disable assertions, but it is bad style and
  1079. unnecessary. Fixes bug 15211; bugfix on,,
  1080. and
  1081. - When calling channel_free_list(), avoid calling smartlist_remove()
  1082. while inside a FOREACH loop. This partially reverts commit
  1083. 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
  1084. incorrectly removed. Fixes bug 16924; bugfix on
  1085. o Minor bugfixes (crypto error-handling, also in
  1086. - Check for failures from crypto_early_init, and refuse to continue.
  1087. A previous typo meant that we could keep going with an
  1088. uninitialized crypto library, and would have OpenSSL initialize
  1089. its own PRNG. Fixes bug 16360; bugfix on, introduced
  1090. when implementing ticket 4900. Patch by "teor".
  1091. o Minor bugfixes (hidden service):
  1092. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  1093. a client authorized hidden service. Fixes bug 15823; bugfix
  1094. on
  1095. - Remove an extraneous newline character from the end of hidden
  1096. service descriptors. Fixes bug 15296; bugfix on
  1097. o Minor bugfixes (Linux seccomp2 sandbox):
  1098. - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
  1099. defined. Patch by "teor". Fixes bug 16515; bugfix on
  1100. - Allow bridge authorities to run correctly under the seccomp2
  1101. sandbox. Fixes bug 16964; bugfix on
  1102. - Add the "hidserv-stats" filename to our sandbox filter for the
  1103. HiddenServiceStatistics option to work properly. Fixes bug 17354;
  1104. bugfix on Patch from David Goulet.
  1105. o Minor bugfixes (Linux seccomp2 sandbox, also in
  1106. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  1107. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  1108. on Patch from "teor".
  1109. o Minor bugfixes (Linux seccomp2 sandbox, also in
  1110. - Allow systemd connections to work with the Linux seccomp2 sandbox
  1111. code. Fixes bug 16212; bugfix on Patch by
  1112. Peter Palfrader.
  1113. - Fix sandboxing to work when running as a relay, by allowing the
  1114. renaming of secret_id_key, and allowing the eventfd2 and futex
  1115. syscalls. Fixes bug 16244; bugfix on Patch by
  1116. Peter Palfrader.
  1117. o Minor bugfixes (logging):
  1118. - When building Tor under Clang, do not include an extra set of
  1119. parentheses in log messages that include function names. Fixes bug
  1120. 15269; bugfix on every released version of Tor when compiled with
  1121. recent enough Clang.
  1122. o Minor bugfixes (network):
  1123. - When attempting to use fallback technique for network interface
  1124. lookup, disregard loopback and multicast addresses since they are
  1125. unsuitable for public communications.
  1126. o Minor bugfixes (open file limit):
  1127. - Fix set_max_file_descriptors() to set by default the max open file
  1128. limit to the current limit when setrlimit() fails. Fixes bug
  1129. 16274; bugfix on tor- Patch by dgoulet.
  1130. o Minor bugfixes (portability):
  1131. - Check correctly for Windows socket errors in the workqueue
  1132. backend. Fixes bug 16741; bugfix on
  1133. - Try harder to normalize the exit status of the Tor process to the
  1134. standard-provided range. Fixes bug 16975; bugfix on every version
  1135. of Tor ever.
  1136. - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
  1137. of bug 17151; bugfix on Patch from Marcin Cieślak.
  1138. o Minor bugfixes (relay):
  1139. - Ensure that worker threads actually exit when a fatal error or
  1140. shutdown is indicated. This fix doesn't currently affect the
  1141. behavior of Tor, because Tor workers never indicates fatal error
  1142. or shutdown except in the unit tests. Fixes bug 16868; bugfix
  1143. on
  1144. - Fix a rarely-encountered memory leak when failing to initialize
  1145. the thread pool. Fixes bug 16631; bugfix on Patch
  1146. from "cypherpunks".
  1147. - Unblock threads before releasing the work queue mutex to ensure
  1148. predictable scheduling behavior. Fixes bug 16644; bugfix
  1149. on
  1150. o Minor bugfixes (security, exit policies):
  1151. - ExitPolicyRejectPrivate now also rejects the relay's published
  1152. IPv6 address (if any), and any publicly routable IPv4 or IPv6
  1153. addresses on any local interfaces. ticket 17027. Patch by "teor".
  1154. Fixes bug 17027; bugfix on
  1155. o Minor bugfixes (statistics):
  1156. - Disregard the ConnDirectionStatistics torrc options when Tor is
  1157. not a relay since in that mode of operation no sensible data is
  1158. being collected and because Tor might run into measurement hiccups
  1159. when running as a client for some time, then becoming a relay.
  1160. Fixes bug 15604; bugfix on
  1161. o Minor bugfixes (systemd):
  1162. - Tor's systemd unit file no longer contains extraneous spaces.
  1163. These spaces would sometimes confuse tools like deb-systemd-
  1164. helper. Fixes bug 16162; bugfix on
  1165. o Minor bugfixes (test networks):
  1166. - When self-testing reachability, use ExtendAllowPrivateAddresses to
  1167. determine if local/private addresses imply reachability. The
  1168. previous fix used TestingTorNetwork, which implies
  1169. ExtendAllowPrivateAddresses, but this excluded rare configurations
  1170. where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
  1171. not. Fixes bug 15771; bugfix on Patch by "teor",
  1172. issue discovered by CJ Ess.
  1173. o Minor bugfixes (tests, also in
  1174. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  1175. 16030; bugfix on Patch from "NewEraCracker".
  1176. o Code simplification and refactoring:
  1177. - Change the function that's called when we need to retry all
  1178. downloads so that it only reschedules the downloads to happen
  1179. immediately, rather than launching them all at once itself. This
  1180. further simplifies Tor's callgraph.
  1181. - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
  1182. to ensure they remain consistent and visible everywhere.
  1183. - Move some format-parsing functions out of crypto.c and
  1184. crypto_curve25519.c into crypto_format.c and/or util_format.c.
  1185. - Move the client-only parts of init_keys() into a separate
  1186. function. Closes ticket 16763.
  1187. - Move the hacky fallback code out of get_interface_address6() into
  1188. separate function and get it covered with unit-tests. Resolves
  1189. ticket 14710.
  1190. - Refactor hidden service client-side cache lookup to intelligently
  1191. report its various failure cases, and disentangle failure cases
  1192. involving a lack of introduction points. Closes ticket 14391.
  1193. - Remove some vestigial workarounds for the MSVC6 compiler. We
  1194. haven't supported that in ages.
  1195. - Remove the unused "nulterminate" argument from buf_pullup().
  1196. - Simplify the microdesc_free() implementation so that it no longer
  1197. appears (to code analysis tools) to potentially invoke a huge
  1198. suite of other microdesc functions.
  1199. - Simply the control graph further by deferring the inner body of
  1200. directory_all_unreachable() into a callback. Closes ticket 16762.
  1201. - The link authentication code has been refactored for better
  1202. testability and reliability. It now uses code generated with the
  1203. "trunnel" binary encoding generator, to reduce the risk of bugs
  1204. due to programmer error. Done as part of ticket 12498.
  1205. - Treat the loss of an owning controller as equivalent to a SIGTERM
  1206. signal. This removes a tiny amount of duplicated code, and
  1207. simplifies our callgraph. Closes ticket 16788.
  1208. - Use our own Base64 encoder instead of OpenSSL's, to allow more
  1209. control over the output. Part of ticket 15652.
  1210. - When generating an event to send to the controller, we no longer
  1211. put the event over the network immediately. Instead, we queue
  1212. these events, and use a Libevent callback to deliver them. This
  1213. change simplifies Tor's callgraph by reducing the number of
  1214. functions from which all other Tor functions are reachable. Closes
  1215. ticket 16695.
  1216. - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
  1217. that try to scan or compile every file on Unix won't decide that
  1218. they are broken.
  1219. o Documentation:
  1220. - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
  1221. - Improve the descriptions of statistics-related torrc options in
  1222. the manpage to describe rationale and possible uses cases. Fixes
  1223. issue 15550.
  1224. - Improve the layout and formatting of ./configure --help messages.
  1225. Closes ticket 15024. Patch from "cypherpunks".
  1226. - Include a specific and (hopefully) accurate documentation of the
  1227. torrc file's meta-format in doc/torrc_format.txt. This is mainly
  1228. of interest to people writing programs to parse or generate torrc
  1229. files. This document is not a commitment to long-term
  1230. compatibility; some aspects of the current format are a bit
  1231. ridiculous. Closes ticket 2325.
  1232. - Include the TUNING document in our source tarball. It is referred
  1233. to in the ChangeLog and an error message. Fixes bug 16929; bugfix
  1234. on
  1235. - Note that HiddenServicePorts can take a unix domain socket. Closes
  1236. ticket 17364.
  1237. - Recommend a 40 GB example AccountingMax in torrc.sample rather
  1238. than a 4 GB max. Closes ticket 16742.
  1239. - Standardize on the term "server descriptor" in the manual page.
  1240. Previously, we had used "router descriptor", "server descriptor",
  1241. and "relay descriptor" interchangeably. Part of ticket 14987.
  1242. - Advise users on how to configure separate IPv4 and IPv6 exit
  1243. policies in the manpage and sample torrcs. Related to ticket 16069.
  1244. - Fix an error in the manual page and comments for
  1245. TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
  1246. required "ORPort connectivity". While this is true, it is in no
  1247. way unique to the HSDir flag. Of all the flags, only HSDirs need a
  1248. DirPort configured in order for the authorities to assign that
  1249. particular flag. Patch by "teor". Fixed as part of 14882; bugfix
  1250. on
  1251. - Fix the usage message of tor-resolve(1) so that it no longer lists
  1252. the removed -F option. Fixes bug 16913; bugfix on
  1253. o Removed code:
  1254. - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
  1255. and always use the internal Base64 decoder. The internal decoder
  1256. has been part of tor since, and no one should
  1257. be using the OpenSSL one. Part of ticket 15652.
  1258. - Remove the 'tor_strclear()' function; use memwipe() instead.
  1259. Closes ticket 14922.
  1260. - Remove the code that would try to aggressively flush controller
  1261. connections while writing to them. This code was introduced in
  1262., in order to keep output buffers from exceeding
  1263. their limits. But there is no longer a maximum output buffer size,
  1264. and flushing data in this way caused some undesirable recursions
  1265. in our call graph. Closes ticket 16480.
  1266. - The internal pure-C tor-fw-helper tool is now removed from the Tor
  1267. distribution, in favor of the pure-Go clone available from
  1268. . The libraries
  1269. used by the C tor-fw-helper are not, in our opinion, very
  1270. confidence- inspiring in their secure-programming techniques.
  1271. Closes ticket 13338.
  1272. o Removed features:
  1273. - Remove the (seldom-used) DynamicDHGroups feature. For anti-
  1274. fingerprinting we now recommend pluggable transports; for forward-
  1275. secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
  1276. - Remove the HidServDirectoryV2 option. Now all relays offer to
  1277. store hidden service descriptors. Related to 16543.
  1278. - Remove the VoteOnHidServDirectoriesV2 option, since all
  1279. authorities have long set it to 1. Closes ticket 16543.
  1280. - Remove the undocumented "--digests" command-line option. It
  1281. complicated our build process, caused subtle build issues on
  1282. multiple platforms, and is now redundant since we started
  1283. including git version identifiers. Closes ticket 14742.
  1284. - Tor no longer contains checks for ancient directory cache versions
  1285. that didn't know about microdescriptors.
  1286. - Tor no longer contains workarounds for stat files generated by
  1287. super-old versions of Tor that didn't choose guards sensibly.
  1288. o Testing:
  1289. - The script now supports performance testing.
  1290. Requires corresponding chutney performance testing changes. Patch
  1291. by "teor". Closes ticket 14175.
  1292. - Add a new set of callgraph analysis scripts that use clang to
  1293. produce a list of which Tor functions are reachable from which
  1294. other Tor functions. We're planning to use these to help simplify
  1295. our code structure by identifying illogical dependencies.
  1296. - Add new 'test-full' and 'test-full-online' targets to run all
  1297. tests, including integration tests with stem and chutney.
  1298. - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
  1299. by-side in the same parent directory. Closes ticket 16903. Patch
  1300. by "teor".
  1301. - Document use of coverity, clang static analyzer, and clang dynamic
  1302. undefined behavior and address sanitizers in doc/HACKING. Include
  1303. detailed usage instructions in the blacklist. Patch by "teor".
  1304. Closes ticket 15817.
  1305. - Make "bridges+hs" the default test network. This tests almost all
  1306. tor functionality during make test-network, while allowing tests
  1307. to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
  1308. test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
  1309. (chutney). Patches by "teor".
  1310. - Make the test-workqueue test work on Windows by initializing the
  1311. network before we begin.
  1312. - New make target (make test-network-all) to run multiple applicable
  1313. chutney test cases. Patch from Teor; closes 16953.
  1314. - Now that OpenSSL has its own scrypt implementation, add an unit
  1315. test that checks for interoperability between libscrypt_scrypt()
  1316. and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
  1317. and rely on EVP_PBE_scrypt() whenever possible. Resolves
  1318. ticket 16189.
  1319. - The link authentication protocol code now has extensive tests.
  1320. - The relay descriptor signature testing code now has
  1321. extensive tests.
  1322. - The test_workqueue program now runs faster, and is enabled by
  1323. default as a part of "make check".
  1324. - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
  1325. functions in dns.c. Implements a portion of ticket 16831.
  1326. - Use environment variables rather than autoconf substitutions to
  1327. send variables from the build system to the test scripts. This
  1328. change should be easier to maintain, and cause 'make distcheck' to
  1329. work better than before. Fixes bug 17148.
  1330. - When building Tor with testing coverage enabled, run Chutney tests
  1331. (if any) using the 'tor-cov' coverage binary.
  1332. - When running test-network or test-stem, check for the absence of
  1333. stem/chutney before doing any build operations.
  1334. - Add a test to verify that the compiler does not eliminate our
  1335. memwipe() implementation. Closes ticket 15377.
  1336. - Add make rule `check-changes` to verify the format of changes
  1337. files. Closes ticket 15180.
  1338. - Add unit tests for control_event_is_interesting(). Add a compile-
  1339. time check that the number of events doesn't exceed the capacity
  1340. of control_event_t.event_mask. Closes ticket 15431, checks for
  1341. bugs similar to 13085. Patch by "teor".
  1342. - Command-line argument tests moved to Stem. Resolves ticket 14806.
  1343. - Integrate the ntor, backtrace, and zero-length keys tests into the
  1344. automake test suite. Closes ticket 15344.
  1345. - Remove assertions during builds to determine Tor's test coverage.
  1346. We don't want to trigger these even in assertions, so including
  1347. them artificially makes our branch coverage look worse than it is.
  1348. This patch provides the new test-stem-full and coverage-html-full
  1349. configure options. Implements ticket 15400.
  1350. - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
  1351. explicitly manage consensus flags in testing networks. Patch by
  1352. "robgjansen", modified by "teor". Implements part of ticket 14882.
  1353. - Check for matching value in server response in Fixes
  1354. bug 15591; bugfix on Reported and fixed
  1355. by "joelanders".
  1356. - Set the severity correctly when testing
  1357. get_interface_addresses_ifaddrs() and
  1358. get_interface_addresses_win32(), so that the tests fail gracefully
  1359. instead of triggering an assertion. Fixes bug 15759; bugfix on
  1360. Reported by Nicolas Derive.
  1361. Changes in version - 2015-07-12
  1362. Tor version fixes some significant stability and hidden
  1363. service client bugs, bulletproofs the cryptography init process, and
  1364. fixes a bug when using the sandbox code with some older versions of
  1365. Linux. Everyone running an older version, especially an older version
  1366. of 0.2.6, should upgrade.
  1367. o Major bugfixes (hidden service clients, stability):
  1368. - Stop refusing to store updated hidden service descriptors on a
  1369. client. This reverts commit 9407040c59218 (which indeed fixed bug
  1370. 14219, but introduced a major hidden service reachability
  1371. regression detailed in bug 16381). This is a temporary fix since
  1372. we can live with the minor issue in bug 14219 (it just results in
  1373. some load on the network) but the regression of 16381 is too much
  1374. of a setback. First-round fix for bug 16381; bugfix
  1375. on
  1376. o Major bugfixes (stability):
  1377. - Stop crashing with an assertion failure when parsing certain kinds
  1378. of malformed or truncated microdescriptors. Fixes bug 16400;
  1379. bugfix on Found by "torkeln"; fix based on a patch
  1380. by "cypherpunks_backup".
  1381. - Stop random client-side assertion failures that could occur when
  1382. connecting to a busy hidden service, or connecting to a hidden
  1383. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  1384. on
  1385. o Minor features (geoip):
  1386. - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
  1387. - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
  1388. o Minor bugfixes (crypto error-handling):
  1389. - Check for failures from crypto_early_init, and refuse to continue.
  1390. A previous typo meant that we could keep going with an
  1391. uninitialized crypto library, and would have OpenSSL initialize
  1392. its own PRNG. Fixes bug 16360; bugfix on, introduced
  1393. when implementing ticket 4900. Patch by "teor".
  1394. o Minor bugfixes (Linux seccomp2 sandbox):
  1395. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  1396. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  1397. on Patch from "teor".
  1398. Changes in version - 2015-06-11
  1399. Tor fixes a regression in the circuit isolation code, increases the
  1400. requirements for receiving an HSDir flag, and addresses some other small
  1401. bugs in the systemd and sandbox code. Clients using circuit isolation
  1402. should upgrade; all directory authorities should upgrade.
  1403. o Major bugfixes (client-side privacy):
  1404. - Properly separate out each SOCKSPort when applying stream
  1405. isolation. The error occurred because each port's session group was
  1406. being overwritten by a default value when the listener connection
  1407. was initialized. Fixes bug 16247; bugfix on Patch
  1408. by "jojelino".
  1409. o Minor feature (directory authorities, security):
  1410. - The HSDir flag given by authorities now requires the Stable flag.
  1411. For the current network, this results in going from 2887 to 2806
  1412. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  1413. attack by raising the effort for a relay to become Stable which
  1414. takes at the very least 7 days to do so and by keeping the 96
  1415. hours uptime requirement for HSDir. Implements ticket 8243.
  1416. o Minor bugfixes (compilation):
  1417. - Build with --enable-systemd correctly when libsystemd is
  1418. installed, but systemd is not. Fixes bug 16164; bugfix on
  1419. Patch from Peter Palfrader.
  1420. o Minor bugfixes (Linux seccomp2 sandbox):
  1421. - Fix sandboxing to work when running as a relaymby renaming of
  1422. secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
  1423. bug 16244; bugfix on Patch by Peter Palfrader.
  1424. - Allow systemd connections to work with the Linux seccomp2 sandbox
  1425. code. Fixes bug 16212; bugfix on Patch by
  1426. Peter Palfrader.
  1427. o Minor bugfixes (tests):
  1428. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  1429. 16030; bugfix on Patch from "NewEraCracker".
  1430. Changes in version - 2015-05-21
  1431. Tor fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
  1432. fixes an authority-side bug in assigning the HSDir flag. All directory
  1433. authorities should upgrade.
  1434. o Major bugfixes (hidden services, backport from
  1435. - Revert commit that made directory authorities assign the HSDir
  1436. flag to relay without a DirPort; this was bad because such relays
  1437. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  1438. on
  1439. o Minor bugfixes (hidden service, backport from
  1440. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  1441. a client authorized hidden service. Fixes bug 15823; bugfix
  1442. on
  1443. o Minor features (geoip):
  1444. - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
  1445. - Update geoip6 to the April 8 2015 Maxmind GeoLite2
  1446. Country database.
  1447. Changes in version - 2015-04-06
  1448. Tor fixes two security issues that could be used by an
  1449. attacker to crash hidden services, or crash clients visiting hidden
  1450. services. Hidden services should upgrade as soon as possible; clients
  1451. should upgrade whenever packages become available.
  1452. This release also contains two simple improvements to make hidden
  1453. services a bit less vulnerable to denial-of-service attacks.
  1454. o Major bugfixes (security, hidden service):
  1455. - Fix an issue that would allow a malicious client to trigger an
  1456. assertion failure and halt a hidden service. Fixes bug 15600;
  1457. bugfix on Reported by "disgleirio".
  1458. - Fix a bug that could cause a client to crash with an assertion
  1459. failure when parsing a malformed hidden service descriptor. Fixes
  1460. bug 15601; bugfix on Found by "DonnchaC".
  1461. o Minor features (DoS-resistance, hidden service):
  1462. - Introduction points no longer allow multiple INTRODUCE1 cells to
  1463. arrive on the same circuit. This should make it more expensive for
  1464. attackers to overwhelm hidden services with introductions.
  1465. Resolves ticket 15515.
  1466. - Decrease the amount of reattempts that a hidden service performs
  1467. when its rendezvous circuits fail. This reduces the computational
  1468. cost for running a hidden service under heavy load. Resolves
  1469. ticket 11447.
  1470. Changes in version - 2015-04-06
  1471. Tor backports two fixes from for security issues that
  1472. could be used by an attacker to crash hidden services, or crash clients
  1473. visiting hidden services. Hidden services should upgrade as soon as
  1474. possible; clients should upgrade whenever packages become available.
  1475. This release also backports a simple improvement to make hidden
  1476. services a bit less vulnerable to denial-of-service attacks.
  1477. o Major bugfixes (security, hidden service):
  1478. - Fix an issue that would allow a malicious client to trigger an
  1479. assertion failure and halt a hidden service. Fixes bug 15600;
  1480. bugfix on Reported by "disgleirio".
  1481. - Fix a bug that could cause a client to crash with an assertion
  1482. failure when parsing a malformed hidden service descriptor. Fixes
  1483. bug 15601; bugfix on Found by "DonnchaC".
  1484. o Minor features (DoS-resistance, hidden service):
  1485. - Introduction points no longer allow multiple INTRODUCE1 cells to
  1486. arrive on the same circuit. This should make it more expensive for
  1487. attackers to overwhelm hidden services with introductions.
  1488. Resolves ticket 15515.
  1489. Changes in version - 2015-04-06
  1490. Tor backports two fixes from for security issues that
  1491. could be used by an attacker to crash hidden services, or crash clients
  1492. visiting hidden services. Hidden services should upgrade as soon as
  1493. possible; clients should upgrade whenever packages become available.
  1494. This release also backports a simple improvement to make hidden
  1495. services a bit less vulnerable to denial-of-service attacks.
  1496. o Major bugfixes (security, hidden service):
  1497. - Fix an issue that would allow a malicious client to trigger an
  1498. assertion failure and halt a hidden service. Fixes bug 15600;
  1499. bugfix on Reported by "disgleirio".
  1500. - Fix a bug that could cause a client to crash with an assertion
  1501. failure when parsing a malformed hidden service descriptor. Fixes
  1502. bug 15601; bugfix on Found by "DonnchaC".
  1503. o Minor features (DoS-resistance, hidden service):
  1504. - Introduction points no longer allow multiple INTRODUCE1 cells to
  1505. arrive on the same circuit. This should make it more expensive for
  1506. attackers to overwhelm hidden services with introductions.
  1507. Resolves ticket 15515.
  1508. Changes in version - 2015-03-24
  1509. Tor is the first stable release in the 0.2.6 series.
  1510. It adds numerous safety, security, correctness, and performance
  1511. improvements. Client programs can be configured to use more kinds of
  1512. sockets, AutomapHosts works better, the multithreading backend is
  1513. improved, cell transmission is refactored, test coverage is much
  1514. higher, more denial-of-service attacks are handled, guard selection is
  1515. improved to handle long-term guards better, pluggable transports
  1516. should work a bit better, and some annoying hidden service performance
  1517. bugs should be addressed.
  1518. o New compiler and system requirements:
  1519. - Tor 0.2.6.x requires that your compiler support more of the C99
  1520. language standard than before. The 'configure' script now detects
  1521. whether your compiler supports C99 mid-block declarations and
  1522. designated initializers. If it does not, Tor will not compile.
  1523. We may revisit this requirement if it turns out that a significant
  1524. number of people need to build Tor with compilers that don't
  1525. bother implementing a 15-year-old standard. Closes ticket 13233.
  1526. - Tor no longer supports systems without threading support. When we
  1527. began working on Tor, there were several systems that didn't have
  1528. threads, or where the thread support wasn't able to run the
  1529. threads of a single process on multiple CPUs. That no longer
  1530. holds: every system where Tor needs to run well now has threading
  1531. support. Resolves ticket 12439.
  1532. o Deprecated versions and removed support:
  1533. - Tor relays older than are no longer allowed to
  1534. advertise themselves on the network. Closes ticket 13555.
  1535. - Tor clients no longer support connecting to hidden services
  1536. running on Tor 0.2.2.x and earlier; the Support022HiddenServices
  1537. option has been removed. (There shouldn't be any hidden services
  1538. running these versions on the network.) Closes ticket 7803.
  1539. o Directory authority changes:
  1540. - The directory authority Faravahar has a new IP address. This
  1541. closes ticket 14487.
  1542. - Remove turtles as a directory authority.
  1543. - Add longclaw as a new (v3) directory authority. This implements
  1544. ticket 13296. This keeps the directory authority count at 9.
  1545. o Major features (bridges):
  1546. - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
  1547. transports if they are configured via the "TOR_PT_PROXY"
  1548. environment variable. Implements proposal 232. Resolves
  1549. ticket 8402.
  1550. o Major features (changed defaults):
  1551. - Prevent relay operators from unintentionally running exits: When a
  1552. relay is configured as an exit node, we now warn the user unless
  1553. the "ExitRelay" option is set to 1. We warn even more loudly if
  1554. the relay is configured with the default exit policy, since this
  1555. can indicate accidental misconfiguration. Setting "ExitRelay 0"
  1556. stops Tor from running as an exit relay. Closes ticket 10067.
  1557. o Major features (client performance, hidden services):
  1558. - Allow clients to use optimistic data when connecting to a hidden
  1559. service, which should remove a round-trip from hidden service
  1560. initialization. See proposal 181 for details. Implements
  1561. ticket 13211.
  1562. o Major features (directory system):
  1563. - Upon receiving an unparseable directory object, if its digest
  1564. matches what we expected, then don't try to download it again.
  1565. Previously, when we got a descriptor we didn't like, we would keep
  1566. trying to download it over and over. Closes ticket 11243.
  1567. - When downloading server- or microdescriptors from a directory
  1568. server, we no longer launch multiple simultaneous requests to the
  1569. same server. This reduces load on the directory servers,
  1570. especially when directory guards are in use. Closes ticket 9969.
  1571. - When downloading server- or microdescriptors over a tunneled
  1572. connection, do not limit the length of our requests to what the
  1573. Squid proxy is willing to handle. Part of ticket 9969.
  1574. - Authorities can now vote on the correct digests and latest
  1575. versions for different software packages. This allows packages
  1576. that include Tor to use the Tor authority system as a way to get
  1577. notified of updates and their correct digests. Implements proposal
  1578. 227. Closes ticket 10395.
  1579. o Major features (guards):
  1580. - Introduce the Guardfraction feature to improves load balancing on
  1581. guard nodes. Specifically, it aims to reduce the traffic gap that
  1582. guard nodes experience when they first get the Guard flag. This is
  1583. a required step if we want to increase the guard lifetime to 9
  1584. months or greater. Closes ticket 9321.
  1585. o Major features (hidden services):
  1586. - Make HS port scanning more difficult by immediately closing the
  1587. circuit when a user attempts to connect to a nonexistent port.
  1588. Closes ticket 13667.
  1589. - Add a HiddenServiceStatistics option that allows Tor relays to
  1590. gather and publish statistics about the overall size and volume of
  1591. hidden service usage. Specifically, when this option is turned on,
  1592. an HSDir will publish an approximate number of hidden services
  1593. that have published descriptors to it the past 24 hours. Also, if
  1594. a relay has acted as a hidden service rendezvous point, it will
  1595. publish the approximate amount of rendezvous cells it has relayed
  1596. the past 24 hours. The statistics themselves are obfuscated so
  1597. that the exact values cannot be derived. For more details see
  1598. proposal 238, "Better hidden service stats from Tor relays". This
  1599. feature is currently disabled by default. Implements feature 13192.
  1600. o Major features (performance):
  1601. - Make the CPU worker implementation more efficient by avoiding the
  1602. kernel and lengthening pipelines. The original implementation used
  1603. sockets to transfer data from the main thread to the workers, and
  1604. didn't allow any thread to be assigned more than a single piece of
  1605. work at once. The new implementation avoids communications
  1606. overhead by making requests in shared memory, avoiding kernel IO
  1607. where possible, and keeping more requests in flight at once.
  1608. Implements ticket 9682.
  1609. o Major features (relay):
  1610. - Raise the minimum acceptable configured bandwidth rate for bridges
  1611. to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
  1612. 20 KiB/sec.) Closes ticket 13822.
  1613. - Complete revision of the code that relays use to decide which cell
  1614. to send next. Formerly, we selected the best circuit to write on
  1615. each channel, but we didn't select among channels in any
  1616. sophisticated way. Now, we choose the best circuits globally from
  1617. among those whose channels are ready to deliver traffic.
  1618. This patch implements a new inter-cmux comparison API, a global
  1619. high/low watermark mechanism and a global scheduler loop for
  1620. transmission prioritization across all channels as well as among
  1621. circuits on one channel. This schedule is currently tuned to
  1622. (tolerantly) avoid making changes in network performance, but it
  1623. should form the basis for major circuit performance increases in
  1624. the future. Code by Andrea; tuning by Rob Jansen; implements
  1625. ticket 9262.
  1626. o Major features (sample torrc):
  1627. - Add a new, infrequently-changed "torrc.minimal". This file is
  1628. similar to torrc.sample, but it will change as infrequently as
  1629. possible, for the benefit of users whose systems prompt them for
  1630. intervention whenever a default configuration file is changed.
  1631. Making this change allows us to update torrc.sample to be a more
  1632. generally useful "sample torrc".
  1633. o Major features (security, unix domain sockets):
  1634. - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
  1635. applications can reach Tor without having to create AF_INET or
  1636. AF_INET6 sockets, meaning they can completely disable their
  1637. ability to make non-Tor network connections. To create a socket of
  1638. this type, use "SocksPort unix:/path/to/socket". Implements
  1639. ticket 12585.
  1640. - Support mapping hidden service virtual ports to AF_UNIX sockets.
  1641. The syntax is "HiddenServicePort 80 unix:/path/to/socket".
  1642. Implements ticket 11485.
  1643. o Major bugfixes (client, automap):
  1644. - Repair automapping with IPv6 addresses. This automapping should
  1645. have worked previously, but one piece of debugging code that we
  1646. inserted to detect a regression actually caused the regression to
  1647. manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
  1648. Diagnosed and fixed by Francisco Blas
  1649. Izquierdo Riera.
  1650. o Major bugfixes (crash, OSX, security):
  1651. - Fix a remote denial-of-service opportunity caused by a bug in
  1652. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  1653. in OSX 10.9.
  1654. o Major bugfixes (directory authorities):
  1655. - Do not assign the HSDir flag to relays if they are not Valid, or
  1656. currently hibernating. Fixes 12573; bugfix on
  1657. o Major bugfixes (directory bandwidth performance):
  1658. - Don't flush the zlib buffer aggressively when compressing
  1659. directory information for clients. This should save about 7% of
  1660. the bandwidth currently used for compressed descriptors and
  1661. microdescriptors. Fixes bug 11787; bugfix on
  1662. o Major bugfixes (exit node stability):
  1663. - Fix an assertion failure that could occur under high DNS load.
  1664. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  1665. diagnosed and fixed by "cypherpunks".
  1666. o Major bugfixes (FreeBSD IPFW transparent proxy):
  1667. - Fix address detection with FreeBSD transparent proxies, when
  1668. "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
  1669. on
  1670. o Major bugfixes (hidden services):
  1671. - When closing an introduction circuit that was opened in parallel
  1672. with others, don't mark the introduction point as unreachable.
  1673. Previously, the first successful connection to an introduction
  1674. point would make the other introduction points get marked as
  1675. having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
  1676. o Major bugfixes (Linux seccomp2 sandbox):
  1677. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  1678. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  1679. Patch from "sanic".
  1680. o Major bugfixes (mixed relay-client operation):
  1681. - When running as a relay and client at the same time (not
  1682. recommended), if we decide not to use a new guard because we want
  1683. to retry older guards, only close the locally-originating circuits
  1684. passing through that guard. Previously we would close all the
  1685. circuits through that guard. Fixes bug 9819; bugfix on
  1686. Reported by "skruffy".
  1687. o Major bugfixes (pluggable transports):
  1688. - Initialize the extended OR Port authentication cookie before
  1689. launching pluggable transports. This prevents a race condition
  1690. that occured when server-side pluggable transports would cache the
  1691. authentication cookie before it has been (re)generated. Fixes bug
  1692. 15240; bugfix on
  1693. o Major bugfixes (relay, stability, possible security):
  1694. - Fix a bug that could lead to a relay crashing with an assertion
  1695. failure if a buffer of exactly the wrong layout is passed to
  1696. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  1697. Patch from "cypherpunks".
  1698. - Do not assert if the 'data' pointer on a buffer is advanced to the
  1699. very end of the buffer; log a BUG message instead. Only assert if
  1700. it is past that point. Fixes bug 15083; bugfix on
  1701. o Minor features (build):
  1702. - New --disable-system-torrc compile-time option to prevent Tor from
  1703. looking for the system-wide torrc or torrc-defaults files.
  1704. Resolves ticket 13037.
  1705. o Minor features (client):
  1706. - Clients are now willing to send optimistic data (before they
  1707. receive a 'connected' cell) to relays of any version. (Relays
  1708. without support for optimistic data are no longer supported on the
  1709. Tor network.) Resolves ticket 13153.
  1710. o Minor features (client):
  1711. - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
  1712. is enabled, reject requests with IP addresses as hostnames.
  1713. Resolves ticket 13315.
  1714. o Minor features (controller):
  1715. - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
  1716. write an unscheduled heartbeat message to the log. Implements
  1717. feature 9503.
  1718. - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
  1719. events so controllers can observe circuit isolation inputs. Closes
  1720. ticket 8405.
  1721. - ControlPort now supports the unix:/path/to/socket syntax as an
  1722. alternative to the ControlSocket option, for consistency with
  1723. SocksPort and HiddenServicePort. Closes ticket 14451.
  1724. - New "GETINFO bw-event-cache" to get information about recent
  1725. bandwidth events. Closes ticket 14128. Useful for controllers to
  1726. get recent bandwidth history after the fix for ticket 13988.
  1727. - Messages about problems in the bootstrap process now include
  1728. information about the server we were trying to connect to when we
  1729. noticed the problem. Closes ticket 15006.
  1730. o Minor features (Denial of service resistance):
  1731. - Count the total number of bytes used storing hidden service
  1732. descriptors against the value of MaxMemInQueues. If we're low on
  1733. memory, and more than 20% of our memory is used holding hidden
  1734. service descriptors, free them until no more than 10% of our
  1735. memory holds hidden service descriptors. Free the least recently
  1736. fetched descriptors first. Resolves ticket 13806.
  1737. - When we have recently been under memory pressure (over 3/4 of
  1738. MaxMemInQueues is allocated), then allocate smaller zlib objects
  1739. for small requests. Closes ticket 11791.
  1740. o Minor features (directory authorities):
  1741. - Don't list relays with a bandwidth estimate of 0 in the consensus.
  1742. Implements a feature proposed during discussion of bug 13000.
  1743. - In tor-gencert, report an error if the user provides the same
  1744. argument more than once.
  1745. - If a directory authority can't find a best consensus method in the
  1746. votes that it holds, it now falls back to its favorite consensus
  1747. method. Previously, it fell back to method 1. Neither of these is
  1748. likely to get enough signatures, but "fall back to favorite"
  1749. doesn't require us to maintain support an obsolete consensus
  1750. method. Implements part of proposal 215.
  1751. o Minor features (geoip):
  1752. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  1753. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  1754. Country database.
  1755. o Minor features (guard nodes):
  1756. - Reduce the time delay before saving guard status to disk from 10
  1757. minutes to 30 seconds (or from one hour to 10 minutes if
  1758. AvoidDiskWrites is set). Closes ticket 12485.
  1759. o Minor features (heartbeat):
  1760. - On relays, report how many connections we negotiated using each
  1761. version of the Tor link protocols. This information will let us
  1762. know if removing support for very old versions of the Tor
  1763. protocols is harming the network. Closes ticket 15212.
  1764. o Minor features (hidden service):
  1765. - Make Sybil attacks against hidden services harder by changing the
  1766. minimum time required to get the HSDir flag from 25 hours up to 96
  1767. hours. Addresses ticket 14149.
  1768. - New option "HiddenServiceAllowUnknownPorts" to allow hidden
  1769. services to disable the anti-scanning feature introduced in
  1770. With this option not set, a connection to an
  1771. unlisted port closes the circuit. With this option set, only a
  1772. RELAY_DONE cell is sent. Closes ticket 14084.
  1773. - When re-enabling the network, don't try to build introduction
  1774. circuits until we have successfully built a circuit. This makes
  1775. hidden services come up faster when the network is re-enabled.
  1776. Patch from "akwizgran". Closes ticket 13447.
  1777. - When we fail to retrieve a hidden service descriptor, send the
  1778. controller an "HS_DESC FAILED" controller event. Implements
  1779. feature 13212.
  1780. - New HiddenServiceDirGroupReadable option to cause hidden service
  1781. directories and hostname files to be created group-readable. Patch
  1782. from "anon", David Stainton, and "meejah". Closes ticket 11291.
  1783. o Minor features (interface):
  1784. - Implement "-f -" command-line option to read torrc configuration
  1785. from standard input, if you don't want to store the torrc file in
  1786. the file system. Implements feature 13865.
  1787. o Minor features (logging):
  1788. - Add a count of unique clients to the bridge heartbeat message.
  1789. Resolves ticket 6852.
  1790. - Suppress "router info incompatible with extra info" message when
  1791. reading extrainfo documents from cache. (This message got loud
  1792. around when we closed bug 9812 in Closes
  1793. ticket 13762.
  1794. - Elevate hidden service authorized-client message from DEBUG to
  1795. INFO. Closes ticket 14015.
  1796. - On Unix-like systems, you can now use named pipes as the target of
  1797. the Log option, and other options that try to append to files.
  1798. Closes ticket 12061. Patch from "carlo von lynX".
  1799. - When opening a log file at startup, send it every log message that
  1800. we generated between startup and opening it. Previously, log
  1801. messages that were generated before opening the log file were only
  1802. logged to stdout. Closes ticket 6938.
  1803. - Add a TruncateLogFile option to overwrite logs instead of
  1804. appending to them. Closes ticket 5583.
  1805. - Quiet some log messages in the heartbeat and at startup. Closes
  1806. ticket 14950.
  1807. o Minor features (portability, Solaris):
  1808. - Threads are no longer disabled by default on Solaris; we believe
  1809. that the versions of Solaris with broken threading support are all
  1810. obsolete by now. Resolves ticket 9495.
  1811. o Minor features (relay):
  1812. - Re-check our address after we detect a changed IP address from
  1813. getsockname(). This ensures that the controller command "GETINFO
  1814. address" will report the correct value. Resolves ticket 11582.
  1815. Patch from "ra".
  1816. - A new AccountingRule option lets Relays set whether they'd like
  1817. AccountingMax to be applied separately to inbound and outbound
  1818. traffic, or applied to the sum of inbound and outbound traffic.
  1819. Resolves ticket 961. Patch by "chobe".
  1820. - When identity keypair is generated for first time, log a
  1821. congratulatory message that links to the new relay lifecycle
  1822. document. Implements feature 10427.
  1823. o Minor features (security, memory wiping):
  1824. - Ensure we securely wipe keys from memory after
  1825. crypto_digest_get_digest and init_curve25519_keypair_from_file
  1826. have finished using them. Resolves ticket 13477.
  1827. o Minor features (security, out-of-memory handling):
  1828. - When handling an out-of-memory condition, allocate less memory for
  1829. temporary data structures. Fixes issue 10115.
  1830. - When handling an out-of-memory condition, consider more types of
  1831. buffers, including those on directory connections, and zlib
  1832. buffers. Resolves ticket 11792.
  1833. o Minor features (stability):
  1834. - Add assertions in our hash-table iteration code to check for
  1835. corrupted values that could cause infinite loops. Closes
  1836. ticket 11737.
  1837. o Minor features (systemd):
  1838. - Various improvements and modernizations in systemd hardening
  1839. support. Closes ticket 13805. Patch from Craig Andrews.
  1840. - Where supported, when running with systemd, report successful
  1841. startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
  1842. - When running with systemd, support systemd watchdog messages. Part
  1843. of ticket 11016. Patch by Michael Scherer.
  1844. o Minor features (testing networks):
  1845. - Add the TestingDirAuthVoteExit option, which lists nodes to assign
  1846. the "Exit" flag regardless of their uptime, bandwidth, or exit
  1847. policy. TestingTorNetwork must be set for this option to have any
  1848. effect. Previously, authorities would take up to 35 minutes to
  1849. give nodes the Exit flag in a test network. Partially implements
  1850. ticket 13161.
  1851. - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
  1852. and the default on a testing network to 2 minutes. Drop the
  1853. MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
  1854. keep the default on a testing network at 30 seconds. This reduces
  1855. HS bootstrap time to around 25 seconds. Also, change the default
  1856. time in to match. Closes ticket 13401. Patch
  1857. by "teor".
  1858. - Create TestingDirAuthVoteHSDir to correspond to
  1859. TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
  1860. HSDir flag for the listed relays regardless of uptime or ORPort
  1861. connectivity. Respects the value of VoteOnHidServDirectoriesV2.
  1862. Partial implementation for ticket 14067. Patch by "teor".
  1863. o Minor features (tor2web mode):
  1864. - Introduce the config option Tor2webRendezvousPoints, which allows
  1865. clients in Tor2webMode to select a specific Rendezvous Point to be
  1866. used in HS circuits. This might allow better performance for
  1867. Tor2Web nodes. Implements ticket 12844.
  1868. o Minor features (transparent proxy):
  1869. - Update the transparent proxy option checks to allow for both ipfw
  1870. and pf on OS X. Closes ticket 14002.
  1871. - Use the correct option when using IPv6 with transparent proxy
  1872. support on Linux. Resolves 13808. Patch by Francisco Blas
  1873. Izquierdo Riera.
  1874. o Minor features (validation):
  1875. - Check all date/time values passed to tor_timegm and
  1876. parse_rfc1123_time for validity, taking leap years into account.
  1877. Improves HTTP header validation. Implemented with bug 13476.
  1878. - In correct_tm(), limit the range of values returned by system
  1879. localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
  1880. This means we don't have to deal with negative or too large dates,
  1881. even if a clock is wrong. Otherwise we might fail to read a file
  1882. written by us which includes such a date. Fixes bug 13476.
  1883. - Stop allowing invalid address patterns like "*/24" that contain
  1884. both a wildcard address and a bit prefix length. This affects all
  1885. our address-range parsing code. Fixes bug 7484; bugfix
  1886. on 0.0.2pre14.
  1887. o Minor bugfixes (bridge clients):
  1888. - When configured to use a bridge without an identity digest (not
  1889. recommended), avoid launching an extra channel to it when
  1890. bootstrapping. Fixes bug 7733; bugfix on
  1891. o Minor bugfixes (bridges):
  1892. - When DisableNetwork is set, do not launch pluggable transport
  1893. plugins, and if any are running, terminate them. Fixes bug 13213;
  1894. bugfix on
  1895. o Minor bugfixes (C correctness):
  1896. - Fix several instances of possible integer overflow/underflow/NaN.
  1897. Fixes bug 13104; bugfix on and later. Patches
  1898. from "teor".
  1899. - In circuit_build_times_calculate_timeout() in circuitstats.c,
  1900. avoid dividing by zero in the pareto calculations. This traps
  1901. under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
  1902. on
  1903. - Fix an integer overflow in format_time_interval(). Fixes bug
  1904. 13393; bugfix on
  1905. - Set the correct day of year value when the system's localtime(_r)
  1906. or gmtime(_r) functions fail to set struct tm. Not externally
  1907. visible. Fixes bug 13476; bugfix on 0.0.2pre14.
  1908. - Avoid unlikely signed integer overflow in tor_timegm on systems
  1909. with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
  1910. o Minor bugfixes (certificate handling):
  1911. - If an authority operator accidentally makes a signing certificate
  1912. with a future publication time, do not discard its real signing
  1913. certificates. Fixes bug 11457; bugfix on
  1914. - Remove any old authority certificates that have been superseded
  1915. for at least two days. Previously, we would keep superseded
  1916. certificates until they expired, if they were published close in
  1917. time to the certificate that superseded them. Fixes bug 11454;
  1918. bugfix on
  1919. o Minor bugfixes (client):
  1920. - Fix smartlist_choose_node_by_bandwidth() so that relays with the
  1921. BadExit flag are not considered worthy candidates. Fixes bug
  1922. 13066; bugfix on
  1923. - Use the consensus schedule for downloading consensuses, and not
  1924. the generic schedule. Fixes bug 11679; bugfix on
  1925. - Handle unsupported or malformed SOCKS5 requests properly by
  1926. responding with the appropriate error message before closing the
  1927. connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
  1928. o Minor bugfixes (client, automapping):
  1929. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  1930. no value follows the option. Fixes bug 14142; bugfix on
  1931. Patch by "teor".
  1932. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  1933. 14195; bugfix on
  1934. - Prevent changes to other options from removing the wildcard value
  1935. "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
  1936. on
  1937. - Allow MapAddress and AutomapHostsOnResolve to work together when
  1938. an address is mapped into another address type (like .onion) that
  1939. must be automapped at resolve time. Fixes bug 7555; bugfix
  1940. on
  1941. o Minor bugfixes (client, bridges):
  1942. - When we are using bridges and we had a network connectivity
  1943. problem, only retry connecting to our currently configured
  1944. bridges, not all bridges we know about and remember using. Fixes
  1945. bug 14216; bugfix on
  1946. o Minor bugfixes (client, DNS):
  1947. - Report the correct cached DNS expiration times on SOCKS port or in
  1948. DNS replies. Previously, we would report everything as "never
  1949. expires." Fixes bug 14193; bugfix on
  1950. - Avoid a small memory leak when we find a cached answer for a
  1951. reverse DNS lookup in a client-side DNS cache. (Remember, client-
  1952. side DNS caching is off by default, and is not recommended.) Fixes
  1953. bug 14259; bugfix on
  1954. o Minor bugfixes (client, IPv6):
  1955. - Reject socks requests to literal IPv6 addresses when IPv6Traffic
  1956. flag is not set; and not because the NoIPv4Traffic flag was set.
  1957. Previously we'd looked at the NoIPv4Traffic flag for both types of
  1958. literal addresses. Fixes bug 14280; bugfix on
  1959. o Minor bugfixes (client, microdescriptors):
  1960. - Use a full 256 bits of the SHA256 digest of a microdescriptor when
  1961. computing which microdescriptors to download. This keeps us from
  1962. erroneous download behavior if two microdescriptor digests ever
  1963. have the same first 160 bits. Fixes part of bug 13399; bugfix
  1964. on
  1965. - Reset a router's status if its microdescriptor digest changes,
  1966. even if the first 160 bits remain the same. Fixes part of bug
  1967. 13399; bugfix on
  1968. o Minor bugfixes (client, torrc):
  1969. - Stop modifying the value of our DirReqStatistics torrc option just
  1970. because we're not a bridge or relay. This bug was causing Tor
  1971. Browser users to write "DirReqStatistics 0" in their torrc files
  1972. as if they had chosen to change the config. Fixes bug 4244; bugfix
  1973. on
  1974. - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
  1975. that our options have changed every time we SIGHUP. Fixes bug
  1976. 9801; bugfix on Patch from "qwerty1".
  1977. o Minor bugfixes (compilation):
  1978. - Fix a compilation warning on s390. Fixes bug 14988; bugfix
  1979. on
  1980. - Silence clang warnings under --enable-expensive-hardening,
  1981. including implicit truncation of 64 bit values to 32 bit, const
  1982. char assignment to self, tautological compare, and additional
  1983. parentheses around equality tests. Fixes bug 13577; bugfix
  1984. on
  1985. - Fix a clang warning about checking whether an address in the
  1986. middle of a structure is NULL. Fixes bug 14001; bugfix
  1987. on
  1988. - The address of an array in the middle of a structure will always
  1989. be non-NULL. clang recognises this and complains. Disable the
  1990. tautologous and redundant check to silence this warning. Fixes bug
  1991. 14001; bugfix on
  1992. - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
  1993. Addresses ticket 14188.
  1994. - Build without warnings with the stock OpenSSL srtp.h header, which
  1995. has a duplicate declaration of SSL_get_selected_srtp_profile().
  1996. Fixes bug 14220; this is OpenSSL's bug, not ours.
  1997. - Do not compile any code related to Tor2Web mode when Tor2Web mode
  1998. is not enabled at compile time. Previously, this code was included
  1999. in a disabled state. See discussion on ticket 12844.
  2000. - Allow our configure script to build correctly with autoconf 2.62
  2001. again. Fixes bug 12693; bugfix on
  2002. - Improve the error message from ./configure to make it clear that
  2003. when asciidoc has not been found, the user will have to either add
  2004. --disable-asciidoc argument or install asciidoc. Resolves
  2005. ticket 13228.
  2006. o Minor bugfixes (controller):
  2007. - Report "down" in response to the "GETINFO entry-guards" command
  2008. when relays are down with an unreachable_since value. Previously,
  2009. we would report "up". Fixes bug 14184; bugfix on
  2010. - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
  2011. 14116; bugfix on
  2012. o Minor bugfixes (controller):
  2013. - Return an error when the second or later arguments of the
  2014. "setevents" controller command are invalid events. Previously we
  2015. would return success while silently skipping invalid events. Fixes
  2016. bug 13205; bugfix on Reported by "fpxnns".
  2017. o Minor bugfixes (directory authority):
  2018. - Allow directory authorities to fetch more data from one another if
  2019. they find themselves missing lots of votes. Previously, they had
  2020. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  2021. bugfix on
  2022. - Do not attempt to download extrainfo documents which we will be
  2023. unable to validate with a matching server descriptor. Fixes bug
  2024. 13762; bugfix on
  2025. - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
  2026. control port. Fixes bug 14953; bugfix on
  2027. - Enlarge the buffer to read bwauth generated files to avoid an
  2028. issue when parsing the file in dirserv_read_measured_bandwidths().
  2029. Fixes bug 14125; bugfix on
  2030. - When running as a v3 directory authority, advertise that you serve
  2031. extra-info documents so that clients who want them can find them
  2032. from you too. Fixes part of bug 11683; bugfix on
  2033. o Minor bugfixes (directory system):
  2034. - Always believe that v3 directory authorities serve extra-info
  2035. documents, whether they advertise "caches-extra-info" or not.
  2036. Fixes part of bug 11683; bugfix on
  2037. - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
  2038. Previously, directories offering BRIDGE_DIRINFO and some other
  2039. flag (i.e. microdescriptors or extrainfo) would be ignored when
  2040. looking for bridges. Partially fixes bug 13163; bugfix
  2041. on
  2042. o Minor bugfixes (file handling):
  2043. - Stop failing when key files are zero-length. Instead, generate new
  2044. keys, and overwrite the empty key files. Fixes bug 13111; bugfix
  2045. on all versions of Tor. Patch by "teor".
  2046. - Stop generating a fresh .old RSA onion key file when the .old file
  2047. is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
  2048. - Avoid overwriting .old key files with empty key files.
  2049. - Skip loading zero-length extrainfo store, router store, stats,
  2050. state, and key files.
  2051. - Avoid crashing when trying to reload a torrc specified as a
  2052. relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
  2053. on
  2054. o Minor bugfixes (hidden services):
  2055. - Close the introduction circuit when we have no more usable intro
  2056. points, instead of waiting for it to time out. This also ensures
  2057. that no follow-up HS descriptor fetch is triggered when the
  2058. circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
  2059. - When fetching a hidden service descriptor for a down service that
  2060. was recently up, do not keep refetching until we try the same
  2061. replica twice in a row. Fixes bug 14219; bugfix on
  2062. - Correctly send a controller event when we find that a rendezvous
  2063. circuit has finished. Fixes bug 13936; bugfix on
  2064. - Pre-check directory permissions for new hidden-services to avoid
  2065. at least one case of "Bug: Acting on config options left us in a
  2066. broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
  2067. - When fetching hidden service descriptors, we now check not only
  2068. for whether we got the hidden service we had in mind, but also
  2069. whether we got the particular descriptors we wanted. This prevents
  2070. a class of inefficient but annoying DoS attacks by hidden service
  2071. directories. Fixes bug 13214; bugfix on Reported
  2072. by "special".
  2073. o Minor bugfixes (Linux seccomp2 sandbox):
  2074. - Make transparent proxy support work along with the seccomp2
  2075. sandbox. Fixes part of bug 13808; bugfix on Patch
  2076. by Francisco Blas Izquierdo Riera.
  2077. - Fix a memory leak in tor-resolve when running with the sandbox
  2078. enabled. Fixes bug 14050; bugfix on
  2079. - Allow glibc fatal errors to be sent to stderr before Tor exits.
  2080. Previously, glibc would try to write them to /dev/tty, and the
  2081. sandbox would trap the call and make Tor exit prematurely. Fixes
  2082. bug 14759; bugfix on
  2083. o Minor bugfixes (logging):
  2084. - Avoid crashing when there are more log domains than entries in
  2085. domain_list. Bugfix on
  2086. - Downgrade warnings about RSA signature failures to info log level.
  2087. Emit a warning when an extra info document is found incompatible
  2088. with a corresponding router descriptor. Fixes bug 9812; bugfix
  2089. on 0.0.6rc3.
  2090. - Make connection_ap_handshake_attach_circuit() log the circuit ID
  2091. correctly. Fixes bug 13701; bugfix on 0.0.6.
  2092. o Minor bugfixes (networking):
  2093. - Check for orconns and use connection_or_close_for_error() rather
  2094. than connection_mark_for_close() directly in the getsockopt()
  2095. failure case of connection_handle_write_impl(). Fixes bug 11302;
  2096. bugfix on
  2097. o Minor bugfixes (parsing):
  2098. - Stop accepting milliseconds (or other junk) at the end of
  2099. descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
  2100. - Support two-number and three-number version numbers correctly, in
  2101. case we change the Tor versioning system in the future. Fixes bug
  2102. 13661; bugfix on 0.0.8pre1.
  2103. o Minor bugfixes (portability):
  2104. - Fix the ioctl()-based network interface lookup code so that it
  2105. will work on systems that have variable-length struct ifreq, for
  2106. example Mac OS X.
  2107. - Use the correct datatype in the SipHash-2-4 function to prevent
  2108. compilers from assuming any sort of alignment. Fixes bug 15436;
  2109. bugfix on
  2110. o Minor bugfixes (preventative security, C safety):
  2111. - When reading a hexadecimal, base-32, or base-64 encoded value from
  2112. a string, always overwrite the whole output buffer. This prevents
  2113. some bugs where we would look at (but fortunately, not reveal)
  2114. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  2115. versions of Tor.
  2116. - Clear all memory targetted by tor_addr_{to,from}_sockaddr(), not
  2117. just the part that's used. This makes it harder for data leak bugs
  2118. to occur in the event of other programming failures. Resolves
  2119. ticket 14041.
  2120. o Minor bugfixes (relay):
  2121. - When generating our family list, remove spaces from around the
  2122. entries. Fixes bug 12728; bugfix on
  2123. - If our previous bandwidth estimate was 0 bytes, allow publishing a
  2124. new relay descriptor immediately. Fixes bug 13000; bugfix
  2125. on
  2126. o Minor bugfixes (shutdown):
  2127. - When shutting down, always call event_del() on lingering read or
  2128. write events before freeing them. Otherwise, we risk double-frees
  2129. or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
  2130. on
  2131. o Minor bugfixes (small memory leaks):
  2132. - Avoid leaking memory when using IPv6 virtual address mappings.
  2133. Fixes bug 14123; bugfix on Patch by Tom van
  2134. der Woerdt.
  2135. o Minor bugfixes (statistics):
  2136. - Increase period over which bandwidth observations are aggregated
  2137. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  2138. o Minor bugfixes (systemd support):
  2139. - Run correctly under systemd with the RunAsDaemon option set. Fixes
  2140. part of bug 14141; bugfix on Patch from Tomasz Torcz.
  2141. - Inform the systemd supervisor about more changes in the Tor
  2142. process status. Implements part of ticket 14141. Patch from
  2143. Tomasz Torcz.
  2144. o Minor bugfixes (testing networks):
  2145. - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
  2146. testing network. Fixes bug 13064; bugfix on
  2147. - Stop using the default authorities in networks which provide both
  2148. AlternateDirAuthority and AlternateBridgeAuthority. Partially
  2149. fixes bug 13163; bugfix on
  2150. o Minor bugfixes (testing networks, fast startup):
  2151. - Allow Tor to build circuits using a consensus with no exits. If
  2152. the consensus has no exits (typical of a bootstrapping test
  2153. network), allow Tor to build circuits once enough descriptors have
  2154. been downloaded. This assists in bootstrapping a testing Tor
  2155. network. Fixes bug 13718; bugfix on Patch
  2156. by "teor".
  2157. - When V3AuthVotingInterval is low, give a lower If-Modified-Since
  2158. header to directory servers. This allows us to obtain consensuses
  2159. promptly when the consensus interval is very short. This assists
  2160. in bootstrapping a testing Tor network. Fixes parts of bugs 13718
  2161. and 13963; bugfix on Patch by "teor".
  2162. - Stop assuming that private addresses are local when checking
  2163. reachability in a TestingTorNetwork. Instead, when testing, assume
  2164. all OR connections are remote. (This is necessary due to many test
  2165. scenarios running all relays on localhost.) This assists in
  2166. bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
  2167. Patch by "teor".
  2168. - Avoid building exit circuits from a consensus with no exits. Now
  2169. thanks to our fix for 13718, we accept a no-exit network as not
  2170. wholly lost, but we need to remember not to try to build exit
  2171. circuits on it. Closes ticket 13814; patch by "teor".
  2172. - Stop requiring exits to have non-zero bandwithcapacity in a
  2173. TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
  2174. ignore exit bandwidthcapacity. This assists in bootstrapping a
  2175. testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
  2176. on Patch by "teor".
  2177. - Add "internal" to some bootstrap statuses when no exits are
  2178. available. If the consensus does not contain Exits, Tor will only
  2179. build internal circuits. In this case, relevant statuses will
  2180. contain the word "internal" as indicated in the Tor control-
  2181. spec.txt. When bootstrap completes, Tor will be ready to build
  2182. internal circuits. If a future consensus contains Exits, exit
  2183. circuits may become available. Fixes part of bug 13718; bugfix on
  2184. Patch by "teor".
  2185. - Decrease minimum consensus interval to 10 seconds when
  2186. TestingTorNetwork is set, or 5 seconds for the first consensus.
  2187. Fix assumptions throughout the code that assume larger intervals.
  2188. Fixes bugs 13718 and 13823; bugfix on Patch
  2189. by "teor".
  2190. - Avoid excluding guards from path building in minimal test
  2191. networks, when we're in a test network and excluding guards would
  2192. exclude all relays. This typically occurs in incredibly small tor
  2193. networks, and those using "TestingAuthVoteGuard *". Fixes part of
  2194. bug 13718; bugfix on Patch by "teor".
  2195. o Minor bugfixes (testing):
  2196. - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
  2197. 15188; bugfix on Patch from Tom van der Woerdt.
  2198. - Stop spawn test failures due to a race condition between the
  2199. SIGCHLD handler updating the process status, and the test reading
  2200. it. Fixes bug 13291; bugfix on
  2201. - Avoid passing an extra backslash when creating a temporary
  2202. directory for running the unit tests on Windows. Fixes bug 12392;
  2203. bugfix on Patch from Gisle Vanem.
  2204. o Minor bugfixes (TLS):
  2205. - Check more thoroughly throughout the TLS code for possible
  2206. unlogged TLS errors. Possible diagnostic or fix for bug 13319.
  2207. o Minor bugfixes (transparent proxy):
  2208. - Use getsockname, not getsockopt, to retrieve the address for a
  2209. TPROXY-redirected connection. Fixes bug 13796; bugfix
  2210. on
  2211. o Minor bugfixes (windows):
  2212. - Remove code to special-case handling of NTE_BAD_KEYSET when
  2213. acquiring windows CryptoAPI context. This error can't actually
  2214. occur for the parameters we're providing. Fixes bug 10816; bugfix
  2215. on 0.0.2pre26.
  2216. o Minor bugfixes (zlib):
  2217. - Avoid truncating a zlib stream when trying to finalize it with an
  2218. empty output buffer. Fixes bug 11824; bugfix on
  2219. o Code simplification and refactoring:
  2220. - Change the entry_is_live() function to take named bitfield
  2221. elements instead of an unnamed list of booleans. Closes
  2222. ticket 12202.
  2223. - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
  2224. Resolves ticket 12205.
  2225. - Use calloc and reallocarray functions instead of multiply-
  2226. then-malloc. This makes it less likely for us to fall victim to an
  2227. integer overflow attack when allocating. Resolves ticket 12855.
  2228. - Use the standard macro name SIZE_MAX, instead of our
  2229. own SIZE_T_MAX.
  2230. - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
  2231. functions which take them as arguments. Replace 0 with NO_DIRINFO
  2232. in a function call for clarity. Seeks to prevent future issues
  2233. like 13163.
  2234. - Avoid 4 null pointer errors under clang static analysis by using
  2235. tor_assert() to prove that the pointers aren't null. Fixes
  2236. bug 13284.
  2237. - Rework the API of policies_parse_exit_policy() to use a bitmask to
  2238. represent parsing options, instead of a confusing mess of
  2239. booleans. Resolves ticket 8197.
  2240. - Introduce a helper function to parse ExitPolicy in
  2241. or_options_t structure.
  2242. - Move fields related to isolating and configuring client ports into
  2243. a shared structure. Previously, they were duplicated across
  2244. port_cfg_t, listener_connection_t, and edge_connection_t. Failure
  2245. to copy them correctly had been the cause of at least one bug in
  2246. the past. Closes ticket 8546.
  2247. - Refactor the get_interface_addresses_raw() doom-function into
  2248. multiple smaller and simpler subfunctions. Cover the resulting
  2249. subfunctions with unit-tests. Fixes a significant portion of
  2250. issue 12376.
  2251. - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
  2252. only for version <= which is now deprecated. Closes
  2253. ticket 14202.
  2254. - Remove a test for a long-defunct broken version-one
  2255. directory server.
  2256. - Refactor main loop to extract the 'loop' part. This makes it
  2257. easier to run Tor under Shadow. Closes ticket 15176.
  2258. - Stop using can_complete_circuits as a global variable; access it
  2259. with a function instead.
  2260. - Avoid using operators directly as macro arguments: this lets us
  2261. apply coccinelle transformations to our codebase more directly.
  2262. Closes ticket 13172.
  2263. - Combine the functions used to parse ClientTransportPlugin and
  2264. ServerTransportPlugin into a single function. Closes ticket 6456.
  2265. - Add inline functions and convenience macros for inspecting channel
  2266. state. Refactor the code to use convenience macros instead of
  2267. checking channel state directly. Fixes issue 7356.
  2268. - Document all members of was_router_added_t and rename
  2270. confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
  2271. - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
  2272. constant instead of hardcoded value. Fixes issue 13840.
  2273. - Refactor our generic strmap and digestmap types into a single
  2274. implementation, so that we can add a new digest256map
  2275. type trivially.
  2276. o Documentation:
  2277. - Add a doc/TUNING document with tips for handling large numbers of
  2278. TCP connections when running busy Tor relay. Update the warning
  2279. message to point to this file when running out of sockets
  2280. operating system is allowing to use simultaneously. Resolves
  2281. ticket 9708.
  2282. - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
  2283. for writing the OpenBSD-specific tips. Resolves ticket 13702.
  2284. - Make the tor-resolve documentation match its help string and its
  2285. options. Resolves part of ticket 14325.
  2286. - Log a more useful error message from tor-resolve when failing to
  2287. look up a hidden service address. Resolves part of ticket 14325.
  2288. - Document the bridge-authority-only 'networkstatus-bridges' file.
  2289. Closes ticket 13713; patch from "tom".
  2290. - Fix typo in PredictedPortsRelevanceTime option description in
  2291. manpage. Resolves issue 13707.
  2292. - Stop suggesting that users specify relays by nickname: it isn't a
  2293. good idea. Also, properly cross-reference how to specify relays in
  2294. all parts of manual documenting options that take a list of
  2295. relays. Closes ticket 13381.
  2296. - Clarify the HiddenServiceDir option description in manpage to make
  2297. it clear that relative paths are taken with respect to the current
  2298. working directory. Also clarify that this behavior is not
  2299. guaranteed to remain indefinitely. Fixes issue 13913.
  2300. o Distribution (systemd):
  2301. - systemd unit file: only allow tor to write to /var/lib/tor and
  2302. /var/log/tor. The rest of the filesystem is accessible for reading
  2303. only. Patch by intrigeri; resolves ticket 12751.
  2304. - systemd unit file: ensure that the process and all its children
  2305. can never gain new privileges. Patch by intrigeri; resolves
  2306. ticket 12939.
  2307. - systemd unit file: set up /var/run/tor as writable for the Tor
  2308. service. Patch by intrigeri; resolves ticket 13196.
  2309. o Downgraded warnings:
  2310. - Don't warn when we've attempted to contact a relay using the wrong
  2311. ntor onion key. Closes ticket 9635.
  2312. o Removed code:
  2313. - Remove some lingering dead code that once supported mempools.
  2314. Mempools were disabled by default in 0.2.5, and removed entirely
  2315. in Closes more of ticket 14848; patch
  2316. by "cypherpunks".
  2317. o Removed features (directory authorities):
  2318. - Remove code that prevented authorities from listing Tor relays
  2319. affected by CVE-2011-2769 as guards. These relays are already
  2320. rejected altogether due to the minimum version requirement of
  2321. Closes ticket 13152.
  2322. - The "AuthDirRejectUnlisted" option no longer has any effect, as
  2323. the fingerprints file (approved-routers) has been deprecated.
  2324. - Directory authorities do not support being Naming dirauths anymore.
  2325. The "NamingAuthoritativeDir" config option is now obsolete.
  2326. - Directory authorities do not support giving out the BadDirectory
  2327. flag anymore.
  2328. - Directory authorities no longer advertise or support consensus
  2329. methods 1 through 12 inclusive. These consensus methods were
  2330. obsolete and/or insecure: maintaining the ability to support them
  2331. served no good purpose. Implements part of proposal 215; closes
  2332. ticket 10163.
  2333. o Removed features:
  2334. - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
  2335. longer silently accepted as an alias for "ExitNodes".
  2336. - The --enable-mempool and --enable-buf-freelists options, which
  2337. were originally created to work around bad malloc implementations,
  2338. no longer exist. They were off-by-default in 0.2.5. Closes
  2339. ticket 14848.
  2340. - We no longer remind the user about configuration options that have
  2341. been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
  2342. - Remove our old, non-weighted bandwidth-based node selection code.
  2343. Previously, we used it as a fallback when we couldn't perform
  2344. weighted bandwidth-based node selection. But that would only
  2345. happen in the cases where we had no consensus, or when we had a
  2346. consensus generated by buggy or ancient directory authorities. In
  2347. either case, it's better to use the more modern, better maintained
  2348. algorithm, with reasonable defaults for the weights. Closes
  2349. ticket 13126.
  2350. - Remove the --disable-curve25519 configure option. Relays and
  2351. clients now are required to support curve25519 and the
  2352. ntor handshake.
  2353. - The old "StrictEntryNodes" and "StrictExitNodes" options, which
  2354. used to be deprecated synonyms for "StrictNodes", are now marked
  2355. obsolete. Resolves ticket 12226.
  2356. - Clients don't understand the BadDirectory flag in the consensus
  2357. anymore, and ignore it.
  2358. o Removed platform support:
  2359. - We no longer include special code to build on Windows CE; as far
  2360. as we know, nobody has used Tor on Windows CE in a very long time.
  2361. Closes ticket 11446.
  2362. o Testing (
  2363. - Stop using "echo -n", as some shells' built-in echo doesn't
  2364. support "-n". Instead, use "/bin/echo -n". Partially fixes
  2365. bug 13161.
  2366. - Stop an apparent test-network hang when used with make -j2. Fixes
  2367. bug 13331.
  2368. - Add a --delay option to, which configures the
  2369. delay before the chutney network tests for data transmission.
  2370. Partially implements ticket 13161.
  2371. o Testing:
  2372. - Test that tor does not fail when key files are zero-length. Check
  2373. that tor generates new keys, and overwrites the empty key files.
  2374. - Test that tor generates new keys when keys are missing
  2375. (existing behavior).
  2376. - Test that tor does not overwrite key files that already contain
  2377. data (existing behavior). Tests bug 13111. Patch by "teor".
  2378. - New "make test-stem" target to run stem integration tests.
  2379. Requires that the "STEM_SOURCE_DIR" environment variable be set.
  2380. Closes ticket 14107.
  2381. - Make the script work correctly on Windows.
  2382. Patch from Gisle Vanem.
  2383. - Move the slower unit tests into a new "./src/test/test-slow"
  2384. binary that can be run independently of the other tests. Closes
  2385. ticket 13243.
  2386. - New tests for many parts of channel, relay, and circuitmux
  2387. functionality. Code by Andrea; part of 9262.
  2388. - New tests for parse_transport_line(). Part of ticket 6456.
  2389. - In the unit tests, use chgrp() to change the group of the unit
  2390. test temporary directory to the current user, so that the sticky
  2391. bit doesn't interfere with tests that check directory groups.
  2392. Closes 13678.
  2393. - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
  2394. by 'rl1987'.
  2395. - Refactor the function that chooses guard nodes so that it can more
  2396. easily be tested; write some tests for it.
  2397. - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
  2398. bugfix on Patch from "cypherpunks."
  2399. - Create unit tests for format_time_interval(). With bug 13393.
  2400. - Add unit tests for tor_timegm signed overflow, tor_timegm and
  2401. parse_rfc1123_time validity checks, correct_tm year clamping. Unit
  2402. tests (visible) fixes in bug 13476.
  2403. - Add a "coverage-html" make target to generate HTML-visualized
  2404. coverage results when building with --enable-coverage. (Requires
  2405. lcov.) Patch from Kevin Murray.
  2406. - Enable the backtrace handler (where supported) when running the
  2407. unit tests.
  2408. - Revise all unit tests that used the legacy test_* macros to
  2409. instead use the recommended tt_* macros. This patch was generated
  2410. with coccinelle, to avoid manual errors. Closes ticket 13119.
  2411. Changes in version - 2015-03-17
  2412. Tor is the second stable release in the 0.2.5 series.
  2413. It backports several bugfixes from the 0.2.6 branch, including a
  2414. couple of medium-level security fixes for relays and exit nodes.
  2415. It also updates the list of directory authorities.
  2416. o Directory authority changes:
  2417. - Remove turtles as a directory authority.
  2418. - Add longclaw as a new (v3) directory authority. This implements
  2419. ticket 13296. This keeps the directory authority count at 9.
  2420. - The directory authority Faravahar has a new IP address. This
  2421. closes ticket 14487.
  2422. o Major bugfixes (crash, OSX, security):
  2423. - Fix a remote denial-of-service opportunity caused by a bug in
  2424. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  2425. in OSX 10.9.
  2426. o Major bugfixes (relay, stability, possible security):
  2427. - Fix a bug that could lead to a relay crashing with an assertion
  2428. failure if a buffer of exactly the wrong layout was passed to
  2429. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  2430. Patch from 'cypherpunks'.
  2431. - Do not assert if the 'data' pointer on a buffer is advanced to the
  2432. very end of the buffer; log a BUG message instead. Only assert if
  2433. it is past that point. Fixes bug 15083; bugfix on
  2434. o Major bugfixes (exit node stability):
  2435. - Fix an assertion failure that could occur under high DNS load.
  2436. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  2437. diagnosed and fixed by "cypherpunks".
  2438. o Major bugfixes (Linux seccomp2 sandbox):
  2439. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  2440. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  2441. Patch from "sanic".
  2442. o Minor features (controller):
  2443. - New "GETINFO bw-event-cache" to get information about recent
  2444. bandwidth events. Closes ticket 14128. Useful for controllers to
  2445. get recent bandwidth history after the fix for ticket 13988.
  2446. o Minor features (geoip):
  2447. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  2448. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  2449. Country database.
  2450. o Minor bugfixes (client, automapping):
  2451. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  2452. no value follows the option. Fixes bug 14142; bugfix on
  2453. Patch by "teor".
  2454. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  2455. 14195; bugfix on
  2456. o Minor bugfixes (compilation):
  2457. - Build without warnings with the stock OpenSSL srtp.h header, which
  2458. has a duplicate declaration of SSL_get_selected_srtp_profile().
  2459. Fixes bug 14220; this is OpenSSL's bug, not ours.
  2460. o Minor bugfixes (directory authority):
  2461. - Allow directory authorities to fetch more data from one another if
  2462. they find themselves missing lots of votes. Previously, they had
  2463. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  2464. bugfix on
  2465. - Enlarge the buffer to read bwauth generated files to avoid an
  2466. issue when parsing the file in dirserv_read_measured_bandwidths().
  2467. Fixes bug 14125; bugfix on
  2468. o Minor bugfixes (statistics):
  2469. - Increase period over which bandwidth observations are aggregated
  2470. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  2471. o Minor bugfixes (preventative security, C safety):
  2472. - When reading a hexadecimal, base-32, or base-64 encoded value from
  2473. a string, always overwrite the whole output buffer. This prevents
  2474. some bugs where we would look at (but fortunately, not reveal)
  2475. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  2476. versions of Tor.
  2477. Changes in version - 2015-03-17
  2478. Tor includes an updated list of directory authorities. It
  2479. also backports a couple of stability and security bugfixes from 0.2.5
  2480. and beyond.
  2481. o Directory authority changes:
  2482. - Remove turtles as a directory authority.
  2483. - Add longclaw as a new (v3) directory authority. This implements
  2484. ticket 13296. This keeps the directory authority count at 9.
  2485. - The directory authority Faravahar has a new IP address. This
  2486. closes ticket 14487.
  2487. o Major bugfixes (exit node stability, also in
  2488. - Fix an assertion failure that could occur under high DNS load.
  2489. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  2490. diagnosed and fixed by "cypherpunks".
  2491. o Major bugfixes (relay, stability, possible security, also in
  2492. - Fix a bug that could lead to a relay crashing with an assertion
  2493. failure if a buffer of exactly the wrong layout was passed to
  2494. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  2495. Patch from 'cypherpunks'.
  2496. - Do not assert if the 'data' pointer on a buffer is advanced to the
  2497. very end of the buffer; log a BUG message instead. Only assert if
  2498. it is past that point. Fixes bug 15083; bugfix on
  2499. o Minor features (geoip):
  2500. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  2501. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  2502. Country database.
  2503. Changes in version - 2014-10-24
  2504. Tor is the first stable release in the 0.2.5 series.
  2505. It adds several new security features, including improved
  2506. denial-of-service resistance for relays, new compiler hardening
  2507. options, and a system-call sandbox for hardened installations on Linux
  2508. (requires seccomp2). The controller protocol has several new features,
  2509. resolving IPv6 addresses should work better than before, and relays
  2510. should be a little more CPU-efficient. We've added support for more
  2511. OpenBSD and FreeBSD transparent proxy types. We've improved the build
  2512. system and testing infrastructure to allow unit testing of more parts
  2513. of the Tor codebase. Finally, we've addressed several nagging pluggable
  2514. transport usability issues, and included numerous other small bugfixes
  2515. and features mentioned below.
  2516. This release marks end-of-life for Tor 0.2.3.x; those Tor versions
  2517. have accumulated many known flaws; everyone should upgrade.
  2518. o Major features (security):
  2519. - The ntor handshake is now on-by-default, no matter what the
  2520. directory authorities recommend. Implements ticket 8561.
  2521. - Make the "tor-gencert" tool used by directory authority operators
  2522. create 2048-bit signing keys by default (rather than 1024-bit, since
  2523. 1024-bit is uncomfortably small these days). Addresses ticket 10324.
  2524. - Warn about attempts to run hidden services and relays in the same
  2525. process: that's probably not a good idea. Closes ticket 12908.
  2526. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  2527. today support TLS 1.0 or later, so we can safely turn off support
  2528. for this old (and insecure) protocol. Fixes bug 13426.
  2529. o Major features (relay security, DoS-resistance):
  2530. - When deciding whether we have run out of memory and we need to
  2531. close circuits, also consider memory allocated in buffers for
  2532. streams attached to each circuit.
  2533. This change, which extends an anti-DoS feature introduced in
  2534. and improved in, lets Tor exit relays
  2535. better resist more memory-based DoS attacks than before. Since the
  2536. MaxMemInCellQueues option now applies to all queues, it is renamed
  2537. to MaxMemInQueues. This feature fixes bug 10169.
  2538. - Avoid hash-flooding denial-of-service attacks by using the secure
  2539. SipHash-2-4 hash function for our hashtables. Without this
  2540. feature, an attacker could degrade performance of a targeted
  2541. client or server by flooding their data structures with a large
  2542. number of entries to be stored at the same hash table position,
  2543. thereby slowing down the Tor instance. With this feature, hash
  2544. table positions are derived from a randomized cryptographic key,
  2545. and an attacker cannot predict which entries will collide. Closes
  2546. ticket 4900.
  2547. - If you don't specify MaxMemInQueues yourself, Tor now tries to
  2548. pick a good value based on your total system memory. Previously,
  2549. the default was always 8 GB. You can still override the default by
  2550. setting MaxMemInQueues yourself. Resolves ticket 11396.
  2551. o Major features (bridges and pluggable transports):
  2552. - Add support for passing arguments to managed pluggable transport
  2553. proxies. Implements ticket 3594.
  2554. - Bridges now track GeoIP information and the number of their users
  2555. even when pluggable transports are in use, and report usage
  2556. statistics in their extra-info descriptors. Resolves tickets 4773
  2557. and 5040.
  2558. - Don't launch pluggable transport proxies if we don't have any
  2559. bridges configured that would use them. Now we can list many
  2560. pluggable transports, and Tor will dynamically start one when it
  2561. hears a bridge address that needs it. Resolves ticket 5018.
  2562. - The bridge directory authority now assigns status flags (Stable,
  2563. Guard, etc) to bridges based on thresholds calculated over all
  2564. Running bridges. Now bridgedb can finally make use of its features
  2565. to e.g. include at least one Stable bridge in its answers. Fixes
  2566. bug 9859.
  2567. o Major features (controller):
  2568. - Extend ORCONN controller event to include an "ID" parameter,
  2569. and add four new controller event types CONN_BW, CIRC_BW,
  2570. CELL_STATS, and TB_EMPTY that show connection and circuit usage.
  2571. The new events are emitted in private Tor networks only, with the
  2572. goal of being able to better track performance and load during
  2573. full-network simulations. Implements proposal 218 and ticket 7359.
  2574. o Major features (relay performance):
  2575. - Speed up server-side lookups of rendezvous and introduction point
  2576. circuits by using hashtables instead of linear searches. These
  2577. functions previously accounted between 3 and 7% of CPU usage on
  2578. some busy relays. Resolves ticket 9841.
  2579. - Avoid wasting CPU when extending a circuit over a channel that is
  2580. nearly out of circuit IDs. Previously, we would do a linear scan
  2581. over possible circuit IDs before finding one or deciding that we
  2582. had exhausted our possibilities. Now, we try at most 64 random
  2583. circuit IDs before deciding that we probably won't succeed. Fixes
  2584. a possible root cause of ticket 11553.
  2585. o Major features (seccomp2 sandbox, Linux only):
  2586. - Use the seccomp2 syscall filtering facility on Linux to limit
  2587. which system calls Tor can invoke. This is an experimental,
  2588. Linux-only feature to provide defense-in-depth against unknown
  2589. attacks. To try turning it on, set "Sandbox 1" in your torrc
  2590. file. Please be ready to report bugs. We hope to add support
  2591. for better sandboxing in the future, including more fine-grained
  2592. filters, better division of responsibility, and support for more
  2593. platforms. This work has been done by Cristian-Matei Toader for
  2594. Google Summer of Code. Resolves tickets 11351 and 11465.
  2595. o Major features (testing networks):
  2596. - Make testing Tor networks bootstrap better: lower directory fetch
  2597. retry schedules and maximum interval without directory requests,
  2598. and raise maximum download tries. Implements ticket 6752.
  2599. - Add make target 'test-network' to run tests on a Chutney network.
  2600. Implements ticket 8530.
  2601. o Major features (other):
  2602. - On some platforms (currently: recent OSX versions, glibc-based
  2603. platforms that support the ELF format, and a few other
  2604. Unix-like operating systems), Tor can now dump stack traces
  2605. when a crash occurs or an assertion fails. By default, traces
  2606. are dumped to stderr (if possible) and to any logs that are
  2607. reporting errors. Implements ticket 9299.
  2608. o Deprecated versions:
  2609. - Tor 0.2.3.x has reached end-of-life; it has received no patches or
  2610. attention for some while.
  2611. o Major bugfixes (security, directory authorities):
  2612. - Directory authorities now include a digest of each relay's
  2613. identity key as a part of its microdescriptor.
  2614. This is a workaround for bug 11743 (reported by "cypherpunks"),
  2615. where Tor clients do not support receiving multiple
  2616. microdescriptors with the same SHA256 digest in the same
  2617. consensus. When clients receive a consensus like this, they only
  2618. use one of the relays. Without this fix, a hostile relay could
  2619. selectively disable some client use of target relays by
  2620. constructing a router descriptor with a different identity and the
  2621. same microdescriptor parameters and getting the authorities to
  2622. list it in a microdescriptor consensus. This fix prevents an
  2623. attacker from causing a microdescriptor collision, because the
  2624. router's identity is not forgeable.
  2625. o Major bugfixes (openssl bug workaround):
  2626. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  2627. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
  2628. bug 13471. This is a workaround for an OpenSSL bug.
  2629. o Major bugfixes (client):
  2630. - Perform circuit cleanup operations even when circuit
  2631. construction operations are disabled (because the network is
  2632. disabled, or because there isn't enough directory information).
  2633. Previously, when we were not building predictive circuits, we
  2634. were not closing expired circuits either. Fixes bug 8387; bugfix on
  2635. This bug became visible in when we
  2636. became more strict about when we have "enough directory information
  2637. to build circuits".
  2638. o Major bugfixes (client, pluggable transports):
  2639. - When managing pluggable transports, use OS notification facilities
  2640. to learn if they have crashed, and don't attempt to kill any
  2641. process that has already exited. Fixes bug 8746; bugfix
  2642. on
  2643. o Major bugfixes (relay denial of service):
  2644. - Instead of writing destroy cells directly to outgoing connection
  2645. buffers, queue them and intersperse them with other outgoing cells.
  2646. This can prevent a set of resource starvation conditions where too
  2647. many pending destroy cells prevent data cells from actually getting
  2648. delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
  2649. bugfix on
  2650. o Major bugfixes (relay):
  2651. - Avoid queuing or sending destroy cells for circuit ID zero when we
  2652. fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
  2653. Found and fixed by "cypherpunks".
  2654. - Fix ORPort reachability detection on relays running behind a
  2655. proxy, by correctly updating the "local" mark on the controlling
  2656. channel when changing the address of an or_connection_t after the
  2657. handshake. Fixes bug 12160; bugfix on
  2658. - Use a direct dirport connection when uploading non-anonymous
  2659. descriptors to the directory authorities. Previously, relays would
  2660. incorrectly use tunnel connections under a fairly wide variety of
  2661. circumstances. Fixes bug 11469; bugfix on
  2662. - When a circuit accidentally has the same circuit ID for its
  2663. forward and reverse direction, correctly detect the direction of
  2664. cells using that circuit. Previously, this bug made roughly one
  2665. circuit in a million non-functional. Fixes bug 12195; this is a
  2666. bugfix on every version of Tor.
  2667. o Minor features (security):
  2668. - New --enable-expensive-hardening option to enable security
  2669. hardening options that consume nontrivial amounts of CPU and
  2670. memory. Right now, this includes AddressSanitizer and UbSan, which
  2671. are supported in newer versions of GCC and Clang. Closes ticket
  2672. 11477.
  2673. - Authorities now assign the Guard flag to the fastest 25% of the
  2674. network (it used to be the fastest 50%). Also raise the consensus
  2675. weight that guarantees the Guard flag from 250 to 2000. For the
  2676. current network, this results in about 1100 guards, down from 2500.
  2677. This step paves the way for moving the number of entry guards
  2678. down to 1 (proposal 236) while still providing reasonable expected
  2679. performance for most users. Implements ticket 12690.
  2680. o Minor features (security, memory management):
  2681. - Memory allocation tricks (mempools and buffer freelists) are now
  2682. disabled by default. You can turn them back on with
  2683. --enable-mempools and --enable-buf-freelists respectively. We're
  2684. disabling these features because malloc performance is good enough
  2685. on most platforms, and a similar feature in OpenSSL exacerbated
  2686. exploitation of the Heartbleed attack. Resolves ticket 11476.
  2687. o Minor features (bridge client):
  2688. - Report a more useful failure message when we can't connect to a
  2689. bridge because we don't have the right pluggable transport
  2690. configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
  2691. o Minor features (bridge):
  2692. - Add an ExtORPortCookieAuthFileGroupReadable option to make the
  2693. cookie file for the ExtORPort g+r by default.
  2694. o Minor features (bridges, pluggable transports):
  2695. - Bridges now write the SHA1 digest of their identity key
  2696. fingerprint (that is, a hash of a hash of their public key) to
  2697. notice-level logs, and to a new hashed-fingerprint file. This
  2698. information will help bridge operators look up their bridge in
  2699. Globe and similar tools. Resolves ticket 10884.
  2700. - Improve the message that Tor displays when running as a bridge
  2701. using pluggable transports without an Extended ORPort listener.
  2702. Also, log the message in the log file too. Resolves ticket 11043.
  2703. - Add threshold cutoffs to the networkstatus document created by
  2704. the Bridge Authority. Fixes bug 1117.
  2705. - On Windows, spawn background processes using the CREATE_NO_WINDOW
  2706. flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
  2707. doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
  2708. Vidalia set this option for us.) Implements ticket 10297.
  2709. o Minor features (build):
  2710. - The configure script has a --disable-seccomp option to turn off
  2711. support for libseccomp on systems that have it, in case it (or
  2712. Tor's use of it) is broken. Resolves ticket 11628.
  2713. - Assume that a user using ./configure --host wants to cross-compile,
  2714. and give an error if we cannot find a properly named
  2715. tool-chain. Add a --disable-tool-name-check option to proceed
  2716. nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
  2717. - If we run ./configure and the compiler recognizes -fstack-protector
  2718. but the linker rejects it, warn the user about a potentially missing
  2719. libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
  2720. - Add support for `--library-versions` flag. Implements ticket 6384.
  2721. - Return the "unexpected sendme" warnings to a warn severity, but make
  2722. them rate limited, to help diagnose ticket 8093.
  2723. - Detect a missing asciidoc, and warn the user about it, during
  2724. configure rather than at build time. Fixes issue 6506. Patch from
  2725. Arlo Breault.
  2726. o Minor features (client):
  2727. - Add a new option, PredictedPortsRelevanceTime, to control how long
  2728. after having received a request to connect to a given port Tor
  2729. will try to keep circuits ready in anticipation of future requests
  2730. for that port. Patch from "unixninja92"; implements ticket 9176.
  2731. o Minor features (config options and command line):
  2732. - Add an --allow-missing-torrc commandline option that tells Tor to
  2733. run even if the configuration file specified by -f is not available.
  2734. Implements ticket 10060.
  2735. - Add support for the TPROXY transparent proxying facility on Linux.
  2736. See documentation for the new TransProxyType option for more
  2737. details. Implementation by "thomo". Closes ticket 10582.
  2738. o Minor features (config options):
  2739. - Config (torrc) lines now handle fingerprints which are missing
  2740. their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
  2741. - Support a --dump-config option to print some or all of the
  2742. configured options. Mainly useful for debugging the command-line
  2743. option parsing code. Helps resolve ticket 4647.
  2744. - Raise awareness of safer logging: notify user of potentially
  2745. unsafe config options, like logging more verbosely than severity
  2746. "notice" or setting SafeLogging to 0. Resolves ticket 5584.
  2747. - Add a new configuration option TestingV3AuthVotingStartOffset
  2748. that bootstraps a network faster by changing the timing for
  2749. consensus votes. Addresses ticket 8532.
  2750. - Add a new torrc option "ServerTransportOptions" that allows
  2751. bridge operators to pass configuration parameters to their
  2752. pluggable transports. Resolves ticket 8929.
  2753. - The config (torrc) file now accepts bandwidth and space limits in
  2754. bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
  2755. you can now say "16 kilobits", and so on.) Resolves ticket 9214.
  2756. Patch by CharlieB.
  2757. o Minor features (controller):
  2758. - Make the entire exit policy available from the control port via
  2759. GETINFO exit-policy/*. Implements enhancement 7952. Patch from
  2760. "rl1987".
  2761. - Because of the fix for ticket 11396, the real limit for memory
  2762. usage may no longer match the configured MaxMemInQueues value. The
  2763. real limit is now exposed via GETINFO limits/max-mem-in-queues.
  2764. - Add a new "HS_DESC" controller event that reports activities
  2765. related to hidden service descriptors. Resolves ticket 8510.
  2766. - New "DROPGUARDS" controller command to forget all current entry
  2767. guards. Not recommended for ordinary use, since replacing guards
  2768. too frequently makes several attacks easier. Resolves ticket 9934;
  2769. patch from "ra".
  2770. - Implement the TRANSPORT_LAUNCHED control port event that
  2771. notifies controllers about new launched pluggable
  2772. transports. Resolves ticket 5609.
  2773. o Minor features (diagnostic):
  2774. - When logging a warning because of bug 7164, additionally check the
  2775. hash table for consistency (as proposed on ticket 11737). This may
  2776. help diagnose bug 7164.
  2777. - When we log a heartbeat, log how many one-hop circuits we have
  2778. that are at least 30 minutes old, and log status information about
  2779. a few of them. This is an attempt to track down bug 8387.
  2780. - When encountering an unexpected CR while writing text to a file on
  2781. Windows, log the name of the file. Should help diagnosing
  2782. bug 11233.
  2783. - Give more specific warnings when a client notices that an onion
  2784. handshake has failed. Fixes ticket 9635.
  2785. - Add significant new logging code to attempt to diagnose bug 12184,
  2786. where relays seem to run out of available circuit IDs.
  2787. - Improve the diagnostic log message for bug 8387 even further to
  2788. try to improve our odds of figuring out why one-hop directory
  2789. circuits sometimes do not get closed.
  2790. - Add more log messages to diagnose bug 7164, which causes
  2791. intermittent "microdesc_free() called but md was still referenced"
  2792. warnings. We now include more information, to figure out why we
  2793. might be cleaning a microdescriptor for being too old if it's
  2794. still referenced by a live node_t object.
  2795. - Log current accounting state (bytes sent and received + remaining
  2796. time for the current accounting period) in the relay's heartbeat
  2797. message. Implements ticket 5526; patch from Peter Retzlaff.
  2798. o Minor features (geoip):
  2799. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  2800. Country database.
  2801. o Minor features (interface):
  2802. - Generate a warning if any ports are listed in the SocksPolicy,
  2803. DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
  2804. AuthDirBadExit options. (These options only support address
  2805. ranges.) Fixes part of ticket 11108.
  2806. o Minor features (kernel API usage):
  2807. - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
  2808. sockets in a single system call. Implements ticket 5129.
  2809. o Minor features (log messages):
  2810. - When ServerTransportPlugin is set on a bridge, Tor can write more
  2811. useful statistics about bridge use in its extrainfo descriptors,
  2812. but only if the Extended ORPort ("ExtORPort") is set too. Add a
  2813. log message to inform the user in this case. Resolves ticket 9651.
  2814. - When receiving a new controller connection, log the origin address.
  2815. Resolves ticket 9698; patch from "sigpipe".
  2816. - When logging OpenSSL engine status at startup, log the status of
  2817. more engines. Fixes ticket 10043; patch from Joshua Datko.
  2818. o Minor features (log verbosity):
  2819. - Demote the message that we give when a flushing connection times
  2820. out for too long from NOTICE to INFO. It was usually meaningless.
  2821. Resolves ticket 5286.
  2822. - Don't log so many notice-level bootstrapping messages at startup
  2823. about downloading descriptors. Previously, we'd log a notice
  2824. whenever we learned about more routers. Now, we only log a notice
  2825. at every 5% of progress. Fixes bug 9963.
  2826. - Warn less verbosely when receiving a malformed
  2827. ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
  2828. o Minor features (performance):
  2829. - If we're using the pure-C 32-bit curve25519_donna implementation
  2830. of curve25519, build it with the -fomit-frame-pointer option to
  2831. make it go faster on register-starved hosts. This improves our
  2832. handshake performance by about 6% on i386 hosts without nacl.
  2833. Closes ticket 8109.
  2834. o Minor features (relay):
  2835. - If a circuit timed out for at least 3 minutes, check if we have a
  2836. new external IP address, and publish a new descriptor with the new
  2837. IP address if it changed. Resolves ticket 2454.
  2838. o Minor features (testing):
  2839. - If Python is installed, "make check" now runs extra tests beyond
  2840. the unit test scripts.
  2841. - When bootstrapping a test network, sometimes very few relays get
  2842. the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
  2843. specify a set of relays which should be voted Guard regardless of
  2844. their uptime or bandwidth. Addresses ticket 9206.
  2845. o Minor features (transparent proxy, *BSD):
  2846. - Support FreeBSD's ipfw firewall interface for TransPort ports on
  2847. FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
  2848. 10267; patch from "yurivict".
  2849. - Support OpenBSD's divert-to rules with the pf firewall for
  2850. transparent proxy ports. To enable it, set "TransProxyType
  2851. pf-divert". This allows Tor to run a TransPort transparent proxy
  2852. port on OpenBSD 4.4 or later without root privileges. See the
  2853. pf.conf(5) manual page for information on configuring pf to use
  2854. divert-to rules. Closes ticket 10896; patch from Dana Koch.
  2855. o Minor bugfixes (bridge client):
  2856. - Stop accepting bridge lines containing hostnames. Doing so would
  2857. cause clients to perform DNS requests on the hostnames, which was
  2858. not sensible behavior. Fixes bug 10801; bugfix on
  2859. o Minor bugfixes (bridges):
  2860. - Avoid potential crashes or bad behavior when launching a
  2861. server-side managed proxy with ORPort or ExtORPort temporarily
  2862. disabled. Fixes bug 9650; bugfix on
  2863. - Fix a bug where the first connection works to a bridge that uses a
  2864. pluggable transport with client-side parameters, but we don't send
  2865. the client-side parameters on subsequent connections. (We don't
  2866. use any pluggable transports with client-side parameters yet,
  2867. but ScrambleSuit will soon become the first one.) Fixes bug 9162;
  2868. bugfix on Based on a patch from "rl1987".
  2869. o Minor bugfixes (build, auxiliary programs):
  2870. - Stop preprocessing the "torify" script with autoconf, since
  2871. it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
  2872. from Guilhem.
  2873. - The tor-fw-helper program now follows the standard convention and
  2874. exits with status code "0" on success. Fixes bug 9030; bugfix on
  2875. Patch by Arlo Breault.
  2876. - Corrected ./configure advice for what openssl dev package you should
  2877. install on Debian. Fixes bug 9207; bugfix on
  2878. o Minor bugfixes (client):
  2879. - Avoid "Tried to open a socket with DisableNetwork set" warnings
  2880. when starting a client with bridges configured and DisableNetwork
  2881. set. (Tor launcher starts Tor with DisableNetwork set the first
  2882. time it runs.) Fixes bug 10405; bugfix on
  2883. - Improve the log message when we can't connect to a hidden service
  2884. because all of the hidden service directory nodes hosting its
  2885. descriptor are excluded. Improves on our fix for bug 10722, which
  2886. was a bugfix on
  2887. - Raise a control port warning when we fail to connect to all of
  2888. our bridges. Previously, we didn't inform the controller, and
  2889. the bootstrap process would stall. Fixes bug 11069; bugfix on
  2891. - Exit immediately when a process-owning controller exits.
  2892. Previously, tor relays would wait for a little while after their
  2893. controller exited, as if they had gotten an INT signal -- but this
  2894. was problematic, since there was no feedback for the user. To do a
  2895. clean shutdown, controllers should send an INT signal and give Tor
  2896. a chance to clean up. Fixes bug 10449; bugfix on
  2897. - Stop attempting to connect to bridges before our pluggable
  2898. transports are configured (harmless but resulted in some erroneous
  2899. log messages). Fixes bug 11156; bugfix on
  2900. - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
  2901. generating incorrect SOCKS5 responses, and confusing client
  2902. applications. Fixes bug 10987; bugfix on
  2903. o Minor bugfixes (client, DNSPort):
  2904. - When using DNSPort, try to respond to AAAA requests with AAAA
  2905. answers. Previously, we hadn't looked at the request type when
  2906. deciding which answer type to prefer. Fixes bug 10468; bugfix on
  2908. - When receiving a DNS query for an unsupported record type, reply
  2909. with no answer rather than with a NOTIMPL error. This behavior
  2910. isn't correct either, but it will break fewer client programs, we
  2911. hope. Fixes bug 10268; bugfix on Original patch
  2912. from "epoch".
  2913. o Minor bugfixes (client, logging during bootstrap):
  2914. - Only report the first fatal bootstrap error on a given OR
  2915. connection. This stops us from telling the controller bogus error
  2916. messages like "DONE". Fixes bug 10431; bugfix on
  2917. - Avoid generating spurious warnings when starting with
  2918. DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
  2920. o Minor bugfixes (closing OR connections):
  2921. - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
  2922. check if it's an or_connection_t and correctly call
  2923. connection_or_close_for_error() rather than
  2924. connection_mark_for_close() directly. Fixes bug 11304; bugfix on
  2926. - When closing all connections on setting DisableNetwork to 1, use
  2927. connection_or_close_normally() rather than closing OR connections
  2928. out from under the channel layer. Fixes bug 11306; bugfix on
  2930. o Minor bugfixes (code correctness):
  2931. - Previously we used two temporary files when writing descriptors to
  2932. disk; now we only use one. Fixes bug 1376.
  2933. - Remove an erroneous (but impossible and thus harmless) pointer
  2934. comparison that would have allowed compilers to skip a bounds
  2935. check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
  2936. Noticed by Jared L Wong and David Fifield.
  2937. - Fix an always-true assertion in pluggable transports code so it
  2938. actually checks what it was trying to check. Fixes bug 10046;
  2939. bugfix on Found by "dcb".
  2940. o Minor bugfixes (command line):
  2941. - Use a single command-line parser for parsing torrc options on the
  2942. command line and for finding special command-line options to avoid
  2943. inconsistent behavior for torrc option arguments that have the same
  2944. names as command-line options. Fixes bugs 4647 and 9578; bugfix on
  2945. 0.0.9pre5.
  2946. - No longer allow 'tor --hash-password' with no arguments. Fixes bug
  2947. 9573; bugfix on 0.0.9pre5.
  2948. o Minor bugfixes (compilation):
  2949. - Compile correctly with builds and forks of OpenSSL (such as
  2950. LibreSSL) that disable compression. Fixes bug 12602; bugfix on
  2951. Patch from "dhill".
  2952. - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
  2953. turned off (that is, without support for v2 link handshakes). Fixes
  2954. bug 4677; bugfix on Patch from "piet".
  2955. - In routerlist_assert_ok(), don't take the address of a
  2956. routerinfo's cache_info member unless that routerinfo is non-NULL.
  2957. Fixes bug 13096; bugfix on Patch by "teor".
  2958. - Fix a large number of false positive warnings from the clang
  2959. analyzer static analysis tool. This should make real warnings
  2960. easier for clang analyzer to find. Patch from "teor". Closes
  2961. ticket 13036.
  2962. - Resolve GCC complaints on OpenBSD about discarding constness in
  2963. TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
  2964. on Patch from Dana Koch.
  2965. - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
  2966. treatment of long and time_t as comparable types. Fixes part of
  2967. bug 11633. Patch from Dana Koch.
  2968. - When deciding whether to build the 64-bit curve25519
  2969. implementation, detect platforms where we can compile 128-bit
  2970. arithmetic but cannot link it. Fixes bug 11729; bugfix on
  2971. Patch from "conradev".
  2972. - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
  2973. bugfix on Found by "cypherpunks".
  2974. - Fix compilation with dmalloc. Fixes bug 11605; bugfix
  2975. on
  2976. - Build and run correctly on systems like OpenBSD-current that have
  2977. patched OpenSSL to remove get_cipher_by_char and/or its
  2978. implementations. Fixes issue 13325.
  2979. o Minor bugfixes (controller and command-line):
  2980. - If changing a config option via "setconf" fails in a recoverable
  2981. way, we used to nonetheless write our new control ports to the
  2982. file described by the "ControlPortWriteToFile" option. Now we only
  2983. write out that file if we successfully switch to the new config
  2984. option. Fixes bug 5605; bugfix on Patch from "Ryman".
  2985. o Minor bugfixes (directory server):
  2986. - No longer accept malformed http headers when parsing urls from
  2987. headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
  2988. bugfix on 0.0.6pre1.
  2989. - When sending a compressed set of descriptors or microdescriptors,
  2990. make sure to finalize the zlib stream. Previously, we would write
  2991. all the compressed data, but if the last descriptor we wanted to
  2992. send was missing or too old, we would not mark the stream as
  2993. finished. This caused problems for decompression tools. Fixes bug
  2994. 11648; bugfix on
  2995. o Minor bugfixes (hidden service):
  2996. - Only retry attempts to connect to a chosen rendezvous point 8
  2997. times, not 30. Fixes bug 4241; bugfix on
  2998. o Minor bugfixes (interface):
  2999. - Reject relative control socket paths and emit a warning. Previously,
  3000. single-component control socket paths would be rejected, but Tor
  3001. would not log why it could not validate the config. Fixes bug 9258;
  3002. bugfix on
  3003. o Minor bugfixes (log messages):
  3004. - Fix a bug where clients using bridges would report themselves
  3005. as 50% bootstrapped even without a live consensus document.
  3006. Fixes bug 9922; bugfix on
  3007. - Suppress a warning where, if there's only one directory authority
  3008. in the network, we would complain that votes and signatures cannot
  3009. be uploaded to other directory authorities. Fixes bug 10842;
  3010. bugfix on
  3011. - Report bootstrapping progress correctly when we're downloading
  3012. microdescriptors. We had updated our "do we have enough microdescs
  3013. to begin building circuits?" logic most recently in
  3014. (see bug 5956), but we left the bootstrap status event logic at
  3015. "how far through getting 1/4 of them are we?" Fixes bug 9958;
  3016. bugfix on, which is where they diverged (see bug 5343).
  3017. o Minor bugfixes (logging):
  3018. - Downgrade "Unexpected onionskin length after decryption" warning
  3019. to a protocol-warn, since there's nothing relay operators can do
  3020. about a client that sends them a malformed create cell. Resolves
  3021. bug 12996; bugfix on 0.0.6rc1.
  3022. - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
  3023. cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
  3024. - When logging information about an EXTEND2 or EXTENDED2 cell, log
  3025. their names correctly. Fixes part of bug 12700; bugfix
  3026. on
  3027. - When logging information about a relay cell whose command we don't
  3028. recognize, log its command as an integer. Fixes part of bug 12700;
  3029. bugfix on
  3030. - Escape all strings from the directory connection before logging
  3031. them. Fixes bug 13071; bugfix on Patch from "teor".
  3032. - Squelch a spurious LD_BUG message "No origin circuit for
  3033. successful SOCKS stream" in certain hidden service failure cases;
  3034. fixes bug 10616.
  3035. - Downgrade the severity of the 'unexpected sendme cell from client'
  3036. from 'warn' to 'protocol warning'. Closes ticket 8093.
  3037. o Minor bugfixes (misc code correctness):
  3038. - In munge_extrainfo_into_routerinfo(), check the return value of
  3039. memchr(). This would have been a serious issue if we ever passed
  3040. it a non-extrainfo. Fixes bug 8791; bugfix on Patch
  3041. from Arlo Breault.
  3042. - On the chance that somebody manages to build Tor on a
  3043. platform where time_t is unsigned, correct the way that
  3044. microdesc_add_to_cache() handles negative time arguments.
  3045. Fixes bug 8042; bugfix on
  3046. - Fix various instances of undefined behavior in channeltls.c,
  3047. tor_memmem(), and eventdns.c that would cause us to construct
  3048. pointers to memory outside an allocated object. (These invalid
  3049. pointers were not accessed, but C does not even allow them to
  3050. exist.) Fixes bug 10363; bugfixes on,,
  3051., and Reported by "bobnomnom".
  3052. - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
  3053. fix some miscellaneous errors in our tests and codebase. Fixes bug
  3054. 11232. Bugfixes on versions back as far as
  3055. - Always check return values for unlink, munmap, UnmapViewOfFile;
  3056. check strftime return values more often. In some cases all we can
  3057. do is report a warning, but this may help prevent deeper bugs from
  3058. going unnoticed. Closes ticket 8787; bugfixes on many, many tor
  3059. versions.
  3060. - Fix numerous warnings from the clang "scan-build" static analyzer.
  3061. Some of these are programming style issues; some of them are false
  3062. positives that indicated awkward code; some are undefined behavior
  3063. cases related to constructing (but not using) invalid pointers;
  3064. some are assumptions about API behavior; some are (harmlessly)
  3065. logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
  3066. correct; and one or two are genuine bugs that weren't reachable
  3067. from the rest of the program. Fixes bug 8793; bugfixes on many,
  3068. many tor versions.
  3069. o Minor bugfixes (node selection):
  3070. - If ExcludeNodes is set, consider non-excluded hidden service
  3071. directory servers before excluded ones. Do not consider excluded
  3072. hidden service directory servers at all if StrictNodes is
  3073. set. (Previously, we would sometimes decide to connect to those
  3074. servers, and then realize before we initiated a connection that
  3075. we had excluded them.) Fixes bug 10722; bugfix on
  3076. Reported by "mr-4".
  3077. - If we set the ExitNodes option but it doesn't include any nodes
  3078. that have the Exit flag, we would choose not to bootstrap. Now we
  3079. bootstrap so long as ExitNodes includes nodes which can exit to
  3080. some port. Fixes bug 10543; bugfix on
  3081. o Minor bugfixes (performance):
  3082. - Avoid a bug where every successful connection made us recompute
  3083. the flag telling us whether we have sufficient information to
  3084. build circuits. Previously, we would forget our cached value
  3085. whenever we successfully opened a channel (or marked a router as
  3086. running or not running for any other reason), regardless of
  3087. whether we had previously believed the router to be running. This
  3088. forced us to run an expensive update operation far too often.
  3089. Fixes bug 12170; bugfix on
  3090. - Avoid using tor_memeq() for checking relay cell integrity. This
  3091. removes a possible performance bottleneck. Fixes part of bug
  3092. 12169; bugfix on
  3093. o Minor bugfixes (platform-specific):
  3094. - When dumping a malformed directory object to disk, save it in
  3095. binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
  3097. - Don't report failures from make_socket_reuseable() on incoming
  3098. sockets on OSX: this can happen when incoming connections close
  3099. early. Fixes bug 10081.
  3100. o Minor bugfixes (pluggable transports):
  3101. - Avoid another 60-second delay when starting Tor in a pluggable-
  3102. transport-using configuration when we already have cached
  3103. descriptors for our bridges. Fixes bug 11965; bugfix
  3104. on
  3105. o Minor bugfixes (protocol correctness):
  3106. - When receiving a VERSIONS cell with an odd number of bytes, close
  3107. the connection immediately since the cell is malformed. Fixes bug
  3108. 10365; bugfix on Spotted by "bobnomnom"; fix by
  3109. "rl1987".
  3110. o Minor bugfixes (relay, other):
  3111. - We now drop CREATE cells for already-existent circuit IDs and for
  3112. zero-valued circuit IDs, regardless of other factors that might
  3113. otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
  3114. on 0.0.8pre1.
  3115. - When rejecting DATA cells for stream_id zero, still count them
  3116. against the circuit's deliver window so that we don't fail to send
  3117. a SENDME. Fixes bug 11246; bugfix on
  3118. o Minor bugfixes (relay, threading):
  3119. - Check return code on spawn_func() in cpuworker code, so that we
  3120. don't think we've spawned a nonworking cpuworker and write junk to
  3121. it forever. Fix related to bug 4345; bugfix on all released Tor
  3122. versions. Found by "skruffy".
  3123. - Use a pthread_attr to make sure that spawn_func() cannot return an
  3124. error while at the same time launching a thread. Fix related to
  3125. bug 4345; bugfix on all released Tor versions. Reported
  3126. by "cypherpunks".
  3127. o Minor bugfixes (relays and bridges):
  3128. - Avoid crashing on a malformed resolv.conf file when running a
  3129. relay using Libevent 1. Fixes bug 8788; bugfix on
  3130. - Non-exit relays no longer launch mock DNS requests to check for
  3131. DNS hijacking. This has been unnecessary since, when
  3132. non-exit relays stopped servicing DNS requests. Fixes bug 965;
  3133. bugfix on Patch from Matt Pagan.
  3134. - Bridges now report complete directory request statistics. Related
  3135. to bug 5824; bugfix on
  3136. - Bridges now never collect statistics that were designed for
  3137. relays. Fixes bug 5824; bugfix on
  3138. o Minor bugfixes (testing):
  3139. - Fix all valgrind warnings produced by the unit tests. There were
  3140. over a thousand memory leak warnings previously, mostly produced
  3141. by forgetting to free things in the unit test code. Fixes bug
  3142. 11618, bugfixes on many versions of Tor.
  3143. o Minor bugfixes (tor-fw-helper):
  3144. - Give a correct log message when tor-fw-helper fails to launch.
  3145. (Previously, we would say something like "tor-fw-helper sent us a
  3146. string we could not parse".) Fixes bug 9781; bugfix
  3147. on
  3148. o Minor bugfixes (trivial memory leaks):
  3149. - Fix a small memory leak when signing a directory object. Fixes bug
  3150. 11275; bugfix on
  3151. - Resolve some memory leaks found by coverity in the unit tests, on
  3152. exit in tor-gencert, and on a failure to compute digests for our
  3153. own keys when generating a v3 networkstatus vote. These leaks
  3154. should never have affected anyone in practice.
  3155. o Code simplification and refactoring:
  3156. - Remove some old fallback code designed to keep Tor clients working
  3157. in a network with only two working relays. Elsewhere in the code we
  3158. have long since stopped supporting such networks, so there wasn't
  3159. much point in keeping it around. Addresses ticket 9926.
  3160. - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
  3161. bugfix on Reported by "cypherpunks".
  3162. - Extract the common duplicated code for creating a subdirectory
  3163. of the data directory and writing to a file in it. Fixes ticket
  3164. 4282; patch from Peter Retzlaff.
  3165. - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
  3166. buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
  3167. i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
  3168. - Add a set of accessor functions for the circuit timeout data
  3169. structure. Fixes ticket 6153; patch from "piet".
  3170. - Clean up exit paths from connection_listener_new(). Closes ticket
  3171. 8789. Patch from Arlo Breault.
  3172. - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
  3173. and drop our own custom pkey_eq() implementation. Fixes bug 9043.
  3174. - Use a doubly-linked list to implement the global circuit list.
  3175. Resolves ticket 9108. Patch from Marek Majkowski.
  3176. - Remove contrib/id_to_fp.c since it wasn't used anywhere.
  3177. - Remove constants and tests for PKCS1 padding; it's insecure and
  3178. shouldn't be used for anything new. Fixes bug 8792; patch
  3179. from Arlo Breault.
  3180. - Remove instances of strcpy() from the unit tests. They weren't
  3181. hurting anything, since they were only in the unit tests, but it's
  3182. embarassing to have strcpy() in the code at all, and some analysis
  3183. tools don't like it. Fixes bug 8790; bugfix on and
  3184. Patch from Arlo Breault.
  3185. - Remove is_internal_IP() function. Resolves ticket 4645.
  3186. - Remove unused function circuit_dump_by_chan from circuitlist.c.
  3187. Closes issue 9107; patch from "marek".
  3188. - Change our use of the ENUM_BF macro to avoid declarations that
  3189. confuse Doxygen.
  3190. - Get rid of router->address, since in all cases it was just the
  3191. string representation of router->addr. Resolves ticket 5528.
  3192. o Documentation:
  3193. - Adjust the URLs in the README to refer to the new locations of
  3194. several documents on the website. Fixes bug 12830. Patch from
  3195. Matt Pagan.
  3196. - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
  3197. ticket 12878.
  3198. - Update manpage to describe some of the files you can expect to
  3199. find in Tor's DataDirectory. Addresses ticket 9839.
  3200. - Clean up several option names in the manpage to match their real
  3201. names, add the missing documentation for a couple of testing and
  3202. directory authority options, remove the documentation for a
  3203. V2-directory fetching option that no longer exists. Resolves
  3204. ticket 11634.
  3205. - Correct the documenation so that it lists the correct directory
  3206. for the stats files. (They are in a subdirectory called "stats",
  3207. not "status".)
  3208. - In the manpage, move more authority-only options into the
  3209. directory authority section so that operators of regular directory
  3210. caches don't get confused.
  3211. - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
  3212. 11061; bugfix on
  3213. - Resolve warnings from Doxygen.
  3214. - Document in the manpage that "KBytes" may also be written as
  3215. "kilobytes" or "KB", that "Kbits" may also be written as
  3216. "kilobits", and so forth. Closes ticket 9222.
  3217. - Document that the ClientOnly config option overrides ORPort.
  3218. Our old explanation made ClientOnly sound as though it did
  3219. nothing at all. Resolves bug 9059.
  3220. - Explain that SocksPolicy, DirPolicy, and similar options don't
  3221. take port arguments. Fixes the other part of ticket 11108.
  3222. - Fix a comment about the rend_server_descriptor_t.protocols field
  3223. to more accurately describe its range. Also, make that field
  3224. unsigned, to more accurately reflect its usage. Fixes bug 9099;
  3225. bugfix on
  3226. - Fix the manpage's description of HiddenServiceAuthorizeClient:
  3227. the maximum client name length is 16, not 19. Fixes bug 11118;
  3228. bugfix on
  3229. o Package cleanup:
  3230. - The contrib directory has been sorted and tidied. Before, it was
  3231. an unsorted dumping ground for useful and not-so-useful things.
  3232. Now, it is divided based on functionality, and the items which
  3233. seemed to be nonfunctional or useless have been removed. Resolves
  3234. ticket 8966; based on patches from "rl1987".
  3235. o Removed code and features:
  3236. - Clients now reject any directory authority certificates lacking
  3237. a dir-key-crosscert element. These have been included since
  3238., so there's no real reason for them to be optional
  3239. any longer. Completes proposal 157. Resolves ticket 10162.
  3240. - Remove all code that existed to support the v2 directory system,
  3241. since there are no longer any v2 directory authorities. Resolves
  3242. ticket 10758.
  3243. - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
  3244. options, which were used for designating authorities as "Hidden
  3245. service authorities". There has been no use of hidden service
  3246. authorities since, when we stopped uploading or
  3247. downloading v0 hidden service descriptors. Fixes bug 10881; also
  3248. part of a fix for bug 10841.
  3249. - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
  3250. and MTBF calculations, but that nobody was using. Fixes bug 11742.
  3251. - The TunnelDirConns and PreferTunnelledDirConns options no longer
  3252. exist; tunneled directory connections have been available since
  3253., and turning them off is not a good idea. This is a
  3254. brute-force fix for 10849, where "TunnelDirConns 0" would break
  3255. hidden services.
  3256. - Remove all code for the long unused v1 directory protocol.
  3257. Resolves ticket 11070.
  3258. - Remove all remaining code related to version-0 hidden service
  3259. descriptors: they have not been in use since Fixes
  3260. the rest of bug 10841.
  3261. - Remove migration code from when we renamed the "cached-routers"
  3262. file to "cached-descriptors" back in This
  3263. incidentally resolves ticket 6502 by cleaning up the related code
  3264. a bit. Patch from Akshay Hebbar.
  3265. o Test infrastructure:
  3266. - Tor now builds each source file in two modes: a mode that avoids
  3267. exposing identifiers needlessly, and another mode that exposes
  3268. more identifiers for testing. This lets the compiler do better at
  3269. optimizing the production code, while enabling us to take more
  3270. radical measures to let the unit tests test things.
  3271. - The production builds no longer include functions used only in
  3272. the unit tests; all functions exposed from a module only for
  3273. unit-testing are now static in production builds.
  3274. - Add an --enable-coverage configuration option to make the unit
  3275. tests (and a new src/or/tor-cov target) to build with gcov test
  3276. coverage support.
  3277. - Update to the latest version of tinytest.
  3278. - Improve the tinytest implementation of string operation tests so
  3279. that comparisons with NULL strings no longer crash the tests; they
  3280. now just fail, normally. Fixes bug 9004; bugfix on
  3281. - New macros in test.h to simplify writing mock-functions for unit
  3282. tests. Part of ticket 11507. Patch from Dana Koch.
  3283. - We now have rudimentary function mocking support that our unit
  3284. tests can use to test functions in isolation. Function mocking
  3285. lets the tests temporarily replace a function's dependencies with
  3286. stub functions, so that the tests can check the function without
  3287. invoking the other functions it calls.
  3288. o Testing:
  3289. - Complete tests for the status.c module. Resolves ticket 11507.
  3290. Patch from Dana Koch.
  3291. - Add more unit tests for the <circid,channel>->circuit map, and
  3292. the destroy-cell-tracking code to fix bug 7912.
  3293. - Unit tests for failing cases of the TAP onion handshake.
  3294. - More unit tests for address-manipulation functions.
  3295. o Distribution (systemd):
  3296. - Include a tor.service file in contrib/dist for use with systemd.
  3297. Some distributions will be able to use this file unmodified;
  3298. others will need to tweak it, or write their own. Patch from Jamie
  3299. Nguyen; resolves ticket 8368.
  3300. - Verify configuration file via ExecStartPre in the systemd unit
  3301. file. Patch from intrigeri; resolves ticket 12730.
  3302. - Explicitly disable RunAsDaemon in the systemd unit file. Our
  3303. current systemd unit uses "Type = simple", so systemd does not
  3304. expect tor to fork. If the user has "RunAsDaemon 1" in their
  3305. torrc, then things won't work as expected. This is e.g. the case
  3306. on Debian (and derivatives), since there we pass "--defaults-torrc
  3307. /usr/share/tor/tor-service-defaults-torrc" (that contains
  3308. "RunAsDaemon 1") by default. Patch by intrigeri; resolves
  3309. ticket 12731.
  3310. Changes in version - 2014-10-20
  3311. Tor disables SSL3 in response to the recent "POODLE" attack
  3312. (even though POODLE does not affect Tor). It also works around a crash
  3313. bug caused by some operating systems' response to the "POODLE" attack
  3314. (which does affect Tor).
  3315. o Major security fixes (also in
  3316. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  3317. today support TLS 1.0 or later, so we can safely turn off support
  3318. for this old (and insecure) protocol. Fixes bug 13426.
  3319. o Major bugfixes (openssl bug workaround, also in
  3320. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  3321. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  3322. 13471. This is a workaround for an OpenSSL bug.
  3323. Changes in version - 2014-09-22
  3324. Tor fixes a bug that affects consistency and speed when
  3325. connecting to hidden services, and it updates the location of one of
  3326. the directory authorities.
  3327. o Major bugfixes:
  3328. - Clients now send the correct address for their chosen rendezvous
  3329. point when trying to access a hidden service. They used to send
  3330. the wrong address, which would still work some of the time because
  3331. they also sent the identity digest of the rendezvous point, and if
  3332. the hidden service happened to try connecting to the rendezvous
  3333. point from a relay that already had a connection open to it,
  3334. the relay would reuse that connection. Now connections to hidden
  3335. services should be more robust and faster. Also, this bug meant
  3336. that clients were leaking to the hidden service whether they were
  3337. on a little-endian (common) or big-endian (rare) system, which for
  3338. some users might have reduced their anonymity. Fixes bug 13151;
  3339. bugfix on
  3340. o Directory authority changes:
  3341. - Change IP address for gabelmoo (v3 directory authority).
  3342. o Minor features (geoip):
  3343. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  3344. Country database.
  3345. Changes in version - 2014-07-28
  3346. Tor brings us a big step closer to slowing down the risk from
  3347. guard rotation, and also backports several important fixes from the
  3348. Tor 0.2.5 alpha release series.
  3349. o Major features:
  3350. - Clients now look at the "usecreatefast" consensus parameter to
  3351. decide whether to use CREATE_FAST or CREATE cells for the first hop
  3352. of their circuit. This approach can improve security on connections
  3353. where Tor's circuit handshake is stronger than the available TLS
  3354. connection security levels, but the tradeoff is more computational
  3355. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  3356. - Make the number of entry guards configurable via a new
  3357. NumEntryGuards consensus parameter, and the number of directory
  3358. guards configurable via a new NumDirectoryGuards consensus
  3359. parameter. Implements ticket 12688.
  3360. o Major bugfixes:
  3361. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  3362. implementation that caused incorrect results on 32-bit
  3363. implementations when certain malformed inputs were used along with
  3364. a small class of private ntor keys. This bug does not currently
  3365. appear to allow an attacker to learn private keys or impersonate a
  3366. Tor server, but it could provide a means to distinguish 32-bit Tor
  3367. implementations from 64-bit Tor implementations. Fixes bug 12694;
  3368. bugfix on Bug found by Robert Ransom; fix from
  3369. Adam Langley.
  3370. o Minor bugfixes:
  3371. - Warn and drop the circuit if we receive an inbound 'relay early'
  3372. cell. Those used to be normal to receive on hidden service circuits
  3373. due to bug 1038, but the buggy Tor versions are long gone from
  3374. the network so we can afford to resume watching for them. Resolves
  3375. the rest of bug 1038; bugfix on
  3376. - Correct a confusing error message when trying to extend a circuit
  3377. via the control protocol but we don't know a descriptor or
  3378. microdescriptor for one of the specified relays. Fixes bug 12718;
  3379. bugfix on
  3380. - Avoid an illegal read from stack when initializing the TLS
  3381. module using a version of OpenSSL without all of the ciphers
  3382. used by the v2 link handshake. Fixes bug 12227; bugfix on
  3383. Found by "starlight".
  3384. o Minor features:
  3385. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  3386. Country database.
  3387. Changes in version - 2014-05-16
  3388. Tor backports numerous high-priority fixes from the Tor 0.2.5
  3389. alpha release series. These include blocking all authority signing
  3390. keys that may have been affected by the OpenSSL "heartbleed" bug,
  3391. choosing a far more secure set of TLS ciphersuites by default, closing
  3392. a couple of memory leaks that could be used to run a target relay out
  3393. of RAM, and several others.
  3394. o Major features (security, backport from
  3395. - Block authority signing keys that were used on authorities
  3396. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  3397. don't have any evidence that these keys _were_ compromised; we're
  3398. doing this to be prudent.) Resolves ticket 11464.
  3399. o Major bugfixes (security, OOM):
  3400. - Fix a memory leak that could occur if a microdescriptor parse
  3401. fails during the tokenizing step. This bug could enable a memory
  3402. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  3403. on
  3404. o Major bugfixes (TLS cipher selection, backport from
  3405. - The relay ciphersuite list is now generated automatically based on
  3406. uniform criteria, and includes all OpenSSL ciphersuites with
  3407. acceptable strength and forward secrecy. Previously, we had left
  3408. some perfectly fine ciphersuites unsupported due to omission or
  3409. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  3410. 'cypherpunks'. Bugfix on
  3411. - Relays now trust themselves to have a better view than clients of
  3412. which TLS ciphersuites are better than others. (Thanks to bug
  3413. 11513, the relay list is now well-considered, whereas the client
  3414. list has been chosen mainly for anti-fingerprinting purposes.)
  3415. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  3416. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  3417. AES128. Resolves ticket 11528.
  3418. - Clients now try to advertise the same list of ciphersuites as
  3419. Firefox 28. This change enables selection of (fast) GCM
  3420. ciphersuites, disables some strange old ciphers, and stops
  3421. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  3422. Resolves ticket 11438.
  3423. o Minor bugfixes (configuration, security):
  3424. - When running a hidden service, do not allow TunneledDirConns 0:
  3425. trying to set that option together with a hidden service would
  3426. otherwise prevent the hidden service from running, and also make
  3427. it publish its descriptors directly over HTTP. Fixes bug 10849;
  3428. bugfix on
  3429. o Minor bugfixes (controller, backport from
  3430. - Avoid sending a garbage value to the controller when a circuit is
  3431. cannibalized. Fixes bug 11519; bugfix on
  3432. o Minor bugfixes (exit relay, backport from
  3433. - Stop leaking memory when we successfully resolve a PTR record.
  3434. Fixes bug 11437; bugfix on
  3435. o Minor bugfixes (bridge client, backport from
  3436. - Avoid 60-second delays in the bootstrapping process when Tor is
  3437. launching for a second time while using bridges. Fixes bug 9229;
  3438. bugfix on
  3439. o Minor bugfixes (relays and bridges, backport from
  3440. - Give the correct URL in the warning message when trying to run a
  3441. relay on an ancient version of Windows. Fixes bug 9393.
  3442. o Minor bugfixes (compilation):
  3443. - Fix a compilation error when compiling with --disable-curve25519.
  3444. Fixes bug 9700; bugfix on
  3445. o Minor bugfixes:
  3446. - Downgrade the warning severity for the the "md was still
  3447. referenced 1 node(s)" warning. Tor has better code
  3448. for trying to diagnose this bug, and the current warning in
  3449. earlier versions of tor achieves nothing useful. Addresses warning
  3450. from bug 7164.
  3451. o Minor features (log verbosity, backport from
  3452. - When we run out of usable circuit IDs on a channel, log only one
  3453. warning for the whole channel, and describe how many circuits
  3454. there were on the channel. Fixes part of ticket 11553.
  3455. o Minor features (security, backport from
  3456. - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
  3457. leave the default at 8GBytes), to better support Raspberry Pi
  3458. users. Fixes bug 9686; bugfix on
  3459. o Documentation (backport from
  3460. - Correctly document that we search for a system torrc file before
  3461. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  3463. Changes in version - 2014-02-28
  3464. Tor further improves security against potential adversaries who
  3465. find breaking 1024-bit crypto doable, and backports several stability
  3466. and robustness patches from the 0.2.5 branch.
  3467. o Major features (client security):
  3468. - When we choose a path for a 3-hop circuit, make sure it contains
  3469. at least one relay that supports the NTor circuit extension
  3470. handshake. Otherwise, there is a chance that we're building
  3471. a circuit that's worth attacking by an adversary who finds
  3472. breaking 1024-bit crypto doable, and that chance changes the game
  3473. theory. Implements ticket 9777.
  3474. o Major bugfixes:
  3475. - Do not treat streams that fail with reason
  3476. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  3477. since it could also indicate an ENETUNREACH connection error. Fixes
  3478. part of bug 10777; bugfix on
  3479. o Code simplification and refactoring:
  3480. - Remove data structures which were introduced to implement the
  3481. CellStatistics option: they are now redundant with the new timestamp
  3482. field in the regular packed_cell_t data structure, which we did
  3483. in in order to resolve bug 9093. Resolves ticket 10870.
  3484. o Minor features:
  3485. - Always clear OpenSSL bignums before freeing them -- even bignums
  3486. that don't contain secrets. Resolves ticket 10793. Patch by
  3487. Florent Daigniere.
  3488. - Build without warnings under clang 3.4. (We have some macros that
  3489. define static functions only some of which will get used later in
  3490. the module. Starting with clang 3.4, these give a warning unless the
  3491. unused attribute is set on them.) Resolves ticket 10904.
  3492. - Update geoip and geoip6 files to the February 7 2014 Maxmind
  3493. GeoLite2 Country database.
  3494. o Minor bugfixes:
  3495. - Set the listen() backlog limit to the largest actually supported
  3496. on the system, not to the value in a header file. Fixes bug 9716;
  3497. bugfix on every released Tor.
  3498. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  3499. exit node as a NOROUTE error, not an INTERNAL error, since they
  3500. can apparently happen when trying to connect to the wrong sort
  3501. of netblocks. Fixes part of bug 10777; bugfix on
  3502. - Fix build warnings about missing "a2x" comment when building the
  3503. manpages from scratch on OpenBSD; OpenBSD calls it "".
  3504. Fixes bug 10929; bugfix on Patch from Dana Koch.
  3505. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  3506. not entirely remove it from the connection lists. Fixes bug 9602;
  3507. bugfix on
  3508. - Fix a segmentation fault in our benchmark code when running with
  3509. Fedora's OpenSSL package, or any other OpenSSL that provides
  3510. ECDH but not P224. Fixes bug 10835; bugfix on
  3511. - Turn "circuit handshake stats since last time" log messages into a
  3512. heartbeat message. Fixes bug 10485; bugfix on
  3513. o Documentation fixes:
  3514. - Document that all but one DirPort entry must have the NoAdvertise
  3515. flag set. Fixes bug 10470; bugfix on /
  3516. Changes in version - 2013-12-22
  3517. Tor fixes potentially poor random number generation for users
  3518. who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
  3519. torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
  3520. and 4) have no state file in their DataDirectory (as would happen on
  3521. first start). Users who generated relay or hidden service identity
  3522. keys in such a situation should discard them and generate new ones.
  3523. This release also fixes a logic error that caused Tor clients to build
  3524. many more preemptive circuits than they actually need.
  3525. o Major bugfixes:
  3526. - Do not allow OpenSSL engines to replace the PRNG, even when
  3527. HardwareAccel is set. The only default builtin PRNG engine uses
  3528. the Intel RDRAND instruction to replace the entire PRNG, and
  3529. ignores all attempts to seed it with more entropy. That's
  3530. cryptographically stupid: the right response to a new alleged
  3531. entropy source is never to discard all previously used entropy
  3532. sources. Fixes bug 10402; works around behavior introduced in
  3533. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  3534. and "rl1987".
  3535. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  3536. address. Fixes bug 10465; bugfix on
  3537. - Avoid launching spurious extra circuits when a stream is pending.
  3538. This fixes a bug where any circuit that _wasn't_ unusable for new
  3539. streams would be treated as if it were, causing extra circuits to
  3540. be launched. Fixes bug 10456; bugfix on
  3541. o Minor bugfixes:
  3542. - Avoid a crash bug when starting with a corrupted microdescriptor
  3543. cache file. Fixes bug 10406; bugfix on
  3544. - If we fail to dump a previously cached microdescriptor to disk, avoid
  3545. freeing duplicate data later on. Fixes bug 10423; bugfix on
  3546. Spotted by "bobnomnom".
  3547. Changes in version - 2013-12-11
  3548. The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
  3549. (1986-2013). Aaron worked on diverse projects including helping to guide
  3550. Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
  3551. transparency to the U.S government's PACER documents, and contributing
  3552. design and development for Tor and Tor2Web. Aaron was one of the latest
  3553. martyrs in our collective fight for civil liberties and human rights,
  3554. and his death is all the more painful because he was one of us.
  3555. Tor, the first stable release in the 0.2.4 branch, features
  3556. a new circuit handshake and link encryption that use ECC to provide
  3557. better security and efficiency; makes relays better manage circuit
  3558. creation requests; uses "directory guards" to reduce client enumeration
  3559. risks; makes bridges collect and report statistics about the pluggable
  3560. transports they support; cleans up and improves our geoip database;
  3561. gets much closer to IPv6 support for clients, bridges, and relays; makes
  3562. directory authorities use measured bandwidths rather than advertised
  3563. ones when computing flags and thresholds; disables client-side DNS
  3564. caching to reduce tracking risks; and fixes a big bug in bridge
  3565. reachability testing. This release introduces two new design
  3566. abstractions in the code: a new "channel" abstraction between circuits
  3567. and or_connections to allow for implementing alternate relay-to-relay
  3568. transports, and a new "circuitmux" abstraction storing the queue of
  3569. circuits for a channel. The release also includes many stability,
  3570. security, and privacy fixes.
  3571. o Major features (new circuit handshake):
  3572. - Tor now supports a new circuit extension handshake designed by Ian
  3573. Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
  3574. circuit extension handshake, later called "TAP", was a bit slow
  3575. (especially on the relay side), had a fragile security proof, and
  3576. used weaker keys than we'd now prefer. The new circuit handshake
  3577. uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
  3578. function, making it significantly more secure than the older
  3579. handshake, and significantly faster. Tor can use one of two built-in
  3580. pure-C curve25519-donna implementations by Adam Langley, or it
  3581. can link against the "nacl" library for a tuned version if present.
  3582. The built-in version is very fast for 64-bit systems when building
  3583. with GCC. The built-in 32-bit version is still faster than the
  3584. old TAP protocol, but using libnacl is better on most such hosts.
  3585. Implements proposal 216; closes ticket 7202.
  3586. o Major features (better link encryption):
  3587. - Relays can now enable the ECDHE TLS ciphersuites when available
  3588. and appropriate. These ciphersuites let us negotiate forward-secure
  3589. TLS secret keys more safely and more efficiently than with our
  3590. previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
  3591. public relays prefer the (faster) P224 group, and bridges prefer
  3592. the (more common) P256 group; you can override this with the
  3593. TLSECGroup option.
  3594. This feature requires clients running or later,
  3595. and requires both sides to be running OpenSSL 1.0.0 or later
  3596. with ECC support. OpenSSL 1.0.1, with the compile-time option
  3597. "enable-ec_nistp_64_gcc_128", is highly recommended.
  3598. Implements the relay side of proposal 198; closes ticket 7200.
  3599. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  3600. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  3601. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  3602. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  3603. them to solve bug 6033.)
  3604. o Major features (relay performance):
  3605. - Instead of limiting the number of queued onionskins (aka circuit
  3606. create requests) to a fixed, hard-to-configure number, we limit
  3607. the size of the queue based on how many we expect to be able to
  3608. process in a given amount of time. We estimate the time it will
  3609. take to process an onionskin based on average processing time
  3610. of previous onionskins. Closes ticket 7291. You'll never have to
  3611. configure MaxOnionsPending again.
  3612. - Relays process the new "NTor" circuit-level handshake requests
  3613. with higher priority than the old "TAP" circuit-level handshake
  3614. requests. We still process some TAP requests to not totally starve
  3615. 0.2.3 clients when NTor becomes popular. A new consensus parameter
  3616. "NumNTorsPerTAP" lets us tune the balance later if we need to.
  3617. Implements ticket 9574.
  3618. o Major features (client bootstrapping resilience):
  3619. - Add a new "FallbackDir" torrc option to use when we can't use
  3620. a directory mirror from the consensus (either because we lack a
  3621. consensus, or because they're all down). Currently, all authorities
  3622. are fallbacks by default, and there are no other default fallbacks,
  3623. but that will change. This option will allow us to give clients a
  3624. longer list of servers to try to get a consensus from when first
  3625. connecting to the Tor network, and thereby reduce load on the
  3626. directory authorities. Implements proposal 206, "Preconfigured
  3627. directory sources for bootstrapping". We also removed the old
  3628. "FallbackNetworkstatus" option, since we never got it working well
  3629. enough to use it. Closes bug 572.
  3630. - If we have no circuits open, use a relaxed timeout (the
  3631. 95th-percentile cutoff) until a circuit succeeds. This heuristic
  3632. should allow Tor to succeed at building circuits even when the
  3633. network connection drastically changes. Should help with bug 3443.
  3634. o Major features (use of guards):
  3635. - Support directory guards (proposal 207): when possible, clients now
  3636. use their entry guards for non-anonymous directory requests. This
  3637. can help prevent client enumeration. Note that this behavior only
  3638. works when we have a usable consensus directory, and when options
  3639. about what to download are more or less standard. In the future we
  3640. should re-bootstrap from our guards, rather than re-bootstrapping
  3641. from the preconfigured list of directory sources that ships with
  3642. Tor. Resolves ticket 6526.
  3643. - Raise the default time that a client keeps an entry guard from
  3644. "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
  3645. 2012 paper. (We would make it even longer, but we need better client
  3646. load balancing first.) Also, make the guard lifetime controllable
  3647. via a new GuardLifetime torrc option and a GuardLifetime consensus
  3648. parameter. Start of a fix for bug 8240; bugfix on
  3649. o Major features (bridges with pluggable transports):
  3650. - Bridges now report the pluggable transports they support to the
  3651. bridge authority, so it can pass the supported transports on to
  3652. bridgedb and/or eventually do reachability testing. Implements
  3653. ticket 3589.
  3654. - Automatically forward the TCP ports of pluggable transport
  3655. proxies using tor-fw-helper if PortForwarding is enabled. Implements
  3656. ticket 4567.
  3657. o Major features (geoip database):
  3658. - Maxmind began labelling Tor relays as being in country "A1",
  3659. which breaks by-country node selection inside Tor. Now we use a
  3660. script to replace "A1" ("Anonymous Proxy") entries in our geoip
  3661. file with real country codes. This script fixes about 90% of "A1"
  3662. entries automatically and uses manual country code assignments to
  3663. fix the remaining 10%. See src/config/README.geoip for details.
  3664. Fixes bug 6266.
  3665. - Add GeoIP database for IPv6 addresses. The new config option
  3666. is GeoIPv6File.
  3667. - Update to the October 2 2013 Maxmind GeoLite Country database.
  3668. o Major features (IPv6):
  3669. - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
  3670. IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
  3671. to happen. Implements ticket 5535.
  3672. - All kind of relays, not just bridges, can now advertise an IPv6
  3673. OR port. Implements ticket 6362.
  3674. - Relays can now exit to IPv6 addresses: make sure that you have IPv6
  3675. connectivity, then set the IPv6Exit flag to 1. Also make sure your
  3676. exit policy reads as you would like: the address * applies to all
  3677. address families, whereas *4 is IPv4 address only, and *6 is IPv6
  3678. addresses only. On the client side, you'll need to wait for enough
  3679. exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
  3680. and use Socks5. Closes ticket 5547, implements proposal 117 as
  3681. revised in proposal 208.
  3682. - Bridge authorities now accept IPv6 bridge addresses and include
  3683. them in network status documents. Implements ticket 5534.
  3684. - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
  3685. o Major features (directory authorities):
  3686. - Directory authorities now prefer using measured bandwidths to
  3687. advertised ones when computing flags and thresholds. Resolves
  3688. ticket 8273.
  3689. - Directory authorities that vote measured bandwidths about more
  3690. than a threshold number of relays now treat relays with
  3691. unmeasured bandwidths as having bandwidth 0 when computing their
  3692. flags. Resolves ticket 8435.
  3693. - Directory authorities now support a new consensus method (17)
  3694. where they cap the published bandwidth of relays for which
  3695. insufficient bandwidth measurements exist. Fixes part of bug 2286.
  3696. - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
  3697. serve any v2 directory information. Now we can test disabling the
  3698. old deprecated v2 directory format, and see whether doing so has
  3699. any effect on network load. Begins to fix bug 6783.
  3700. o Major features (build and portability):
  3701. - Switch to a nonrecursive Makefile structure. Now instead of each
  3702. invoking other's, there is a master
  3703. that includes the others. This change makes our build
  3704. process slightly more maintainable, and improves parallelism for
  3705. building with make -j. Original patch by Stewart Smith; various
  3706. fixes by Jim Meyering.
  3707. - Where available, we now use automake's "silent" make rules by
  3708. default, so that warnings are easier to spot. You can get the old
  3709. behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
  3710. - Resume building correctly with MSVC and Makefile.nmake. This patch
  3711. resolves numerous bugs and fixes reported by ultramage, including
  3712. 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
  3713. o Security features:
  3714. - Switch to a completely time-invariant approach for picking nodes
  3715. weighted by bandwidth. Our old approach would run through the
  3716. part of the loop after it had made its choice slightly slower
  3717. than it ran through the part of the loop before it had made its
  3718. choice. Addresses ticket 6538.
  3719. - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
  3720. by tor2web clients allows hidden services to identify tor2web
  3721. clients through their repeated selection of the same rendezvous
  3722. and introduction point circuit endpoints (their guards). Resolves
  3723. ticket 6888.
  3724. o Major bugfixes (relay denial of service):
  3725. - When we have too much memory queued in circuits (according to a new
  3726. MaxMemInCellQueues option), close the circuits that have the oldest
  3727. queued cells, on the theory that those are most responsible for
  3728. us running low on memory. This prevents us from running out of
  3729. memory as a relay if circuits fill up faster than they can be
  3730. drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
  3731. Tor. This bug is a further fix beyond bug 6252, whose fix was
  3732. merged into
  3733. - Reject bogus create and relay cells with 0 circuit ID or 0 stream
  3734. ID: these could be used to create unexpected streams and circuits
  3735. which would count as "present" to some parts of Tor but "absent"
  3736. to others, leading to zombie circuits and streams or to a bandwidth
  3737. denial-of-service. Fixes bug 7889; bugfix on every released version
  3738. of Tor. Reported by "oftc_must_be_destroyed".
  3739. - Avoid a bug where our response to TLS renegotiation under certain
  3740. network conditions could lead to a busy-loop, with 100% CPU
  3741. consumption. Fixes bug 5650; bugfix on
  3742. o Major bugfixes (asserts, crashes, leaks):
  3743. - Prevent the get_freelists() function from running off the end of
  3744. the list of freelists if it somehow gets an unrecognized
  3745. allocation. Fixes bug 8844; bugfix on Reported by
  3746. eugenis.
  3747. - Avoid a memory leak where we would leak a consensus body when we
  3748. find that a consensus which we couldn't previously verify due to
  3749. missing certificates is now verifiable. Fixes bug 8719; bugfix
  3750. on
  3751. - If we are unable to save a microdescriptor to the journal, do not
  3752. drop it from memory and then reattempt downloading it. Fixes bug
  3753. 9645; bugfix on
  3754. - Fix an assertion failure that would occur when disabling the
  3755. ORPort setting on a running Tor process while accounting was
  3756. enabled. Fixes bug 6979; bugfix on
  3757. - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
  3758. when an exit connection with optimistic data succeeds immediately
  3759. rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
  3761. - Fix a memory leak that would occur whenever a configuration
  3762. option changed. Fixes bug 8718; bugfix on
  3763. o Major bugfixes (relay rate limiting):
  3764. - When a TLS write is partially successful but incomplete, remember
  3765. that the flushed part has been flushed, and notice that bytes were
  3766. actually written. Reported and fixed pseudonymously. Fixes bug 7708;
  3767. bugfix on Tor
  3768. - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
  3769. to 1GB/1GB. The previous defaults were intended to be "basically
  3770. infinite", but it turns out they're now limiting our 100mbit+
  3771. relays and bridges. Fixes bug 6605; bugfix on (the
  3772. last time we raised it).
  3773. - No longer stop reading or writing on cpuworker connections when
  3774. our rate limiting buckets go empty. Now we should handle circuit
  3775. handshake requests more promptly. Resolves bug 9731.
  3776. o Major bugfixes (client-side privacy):
  3777. - When we mark a circuit as unusable for new circuits, have it
  3778. continue to be unusable for new circuits even if MaxCircuitDirtiness
  3779. is increased too much at the wrong time, or the system clock jumps
  3780. backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
  3781. - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
  3782. which have resolved to internal addresses") is set, apply that
  3783. rule to IPv6 as well. Fixes bug 8475; bugfix on
  3784. - When an exit relay rejects a stream with reason "exit policy", but
  3785. we only know an exit policy summary (e.g. from the microdesc
  3786. consensus) for it, do not mark the relay as useless for all exiting.
  3787. Instead, mark just the circuit as unsuitable for that particular
  3788. address. Fixes part of bug 7582; bugfix on
  3789. o Major bugfixes (stream isolation):
  3790. - Allow applications to get proper stream isolation with
  3791. IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
  3792. username/password authentication also offer "no authentication". Tor
  3793. had previously preferred "no authentication", so the applications
  3794. never actually sent Tor their auth details. Now Tor selects
  3795. username/password authentication if it's offered. You can disable
  3796. this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
  3797. bug 8117; bugfix on
  3798. - Follow the socks5 protocol when offering username/password
  3799. authentication. The fix for bug 8117 exposed this bug, and it
  3800. turns out real-world applications like Pidgin do care. Bugfix on
  3801.; fixes bug 8879.
  3802. o Major bugfixes (client circuit building):
  3803. - Alter circuit build timeout measurement to start at the point
  3804. where we begin the CREATE/CREATE_FAST step (as opposed to circuit
  3805. initialization). This should make our timeout measurements more
  3806. uniform. Previously, we were sometimes including ORconn setup time
  3807. in our circuit build time measurements. Should resolve bug 3443.
  3808. - If the circuit build timeout logic is disabled (via the consensus,
  3809. or because we are an authority), then don't build testing circuits.
  3810. Fixes bug 9657; bugfix on
  3811. o Major bugfixes (client-side DNS):
  3812. - Turn off the client-side DNS cache by default. Updating and using
  3813. the DNS cache is now configurable on a per-client-port
  3814. level. SOCKSPort, DNSPort, etc lines may now contain
  3815. {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
  3816. cache these types of DNS answers when we receive them from an
  3817. exit node in response to an application request on this port, and
  3818. {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
  3819. cached DNS answers of these types, we shouldn't use them. It's
  3820. potentially risky to use cached DNS answers at the client, since
  3821. doing so can indicate to one exit what answers we've gotten
  3822. for DNS lookups in the past. With IPv6, this becomes especially
  3823. problematic. Using cached DNS answers for requests on the same
  3824. circuit would present less linkability risk, since all traffic
  3825. on a circuit is already linkable, but it would also provide
  3826. little performance benefit: the exit node caches DNS replies
  3827. too. Implements a simplified version of Proposal 205. Implements
  3828. ticket 7570.
  3829. o Major bugfixes (hidden service privacy):
  3830. - Limit hidden service descriptors to at most ten introduction
  3831. points, to slow one kind of guard enumeration. Fixes bug 9002;
  3832. bugfix on
  3833. o Major bugfixes (directory fetching):
  3834. - If the time to download the next old-style networkstatus is in
  3835. the future, do not decline to consider whether to download the
  3836. next microdescriptor networkstatus. Fixes bug 9564; bugfix on
  3838. - We used to always request authority certificates by identity digest,
  3839. meaning we'd get the newest one even when we wanted one with a
  3840. different signing key. Then we would complain about being given
  3841. a certificate we already had, and never get the one we really
  3842. wanted. Now we use the "fp-sk/" resource as well as the "fp/"
  3843. resource to request the one we want. Fixes bug 5595; bugfix on
  3845. o Major bugfixes (bridge reachability):
  3846. - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
  3847. previously they did not, which prevented them from receiving
  3848. successful connections from relays for self-test or bandwidth
  3849. testing. Also, when a relay is extending a circuit to a bridge,
  3850. it needs to send a NETINFO cell, even when the bridge hasn't sent
  3851. an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on
  3852. o Major bugfixes (control interface):
  3853. - When receiving a new configuration file via the control port's
  3854. LOADCONF command, do not treat the defaults file as absent.
  3855. Fixes bug 9122; bugfix on
  3856. o Major bugfixes (directory authorities):
  3857. - Stop marking every relay as having been down for one hour every
  3858. time we restart a directory authority. These artificial downtimes
  3859. were messing with our Stable and Guard flag calculations. Fixes
  3860. bug 8218 (introduced by the fix for 1035). Bugfix on
  3861. - When computing directory thresholds, ignore any rejected-as-sybil
  3862. nodes during the computation so that they can't influence Fast,
  3863. Guard, etc. (We should have done this for proposal 109.) Fixes
  3864. bug 8146.
  3865. - When marking a node as a likely sybil, reset its uptime metrics
  3866. to zero, so that it cannot time towards getting marked as Guard,
  3867. Stable, or HSDir. (We should have done this for proposal 109.) Fixes
  3868. bug 8147.
  3869. - Fix a bug in the voting algorithm that could yield incorrect results
  3870. when a non-naming authority declared too many flags. Fixes bug 9200;
  3871. bugfix on
  3872. o Internal abstraction features:
  3873. - Introduce new channel_t abstraction between circuits and
  3874. or_connection_t to allow for implementing alternate OR-to-OR
  3875. transports. A channel_t is an abstract object which can either be a
  3876. cell-bearing channel, which is responsible for authenticating and
  3877. handshaking with the remote OR and transmitting cells to and from
  3878. it, or a listening channel, which spawns new cell-bearing channels
  3879. at the request of remote ORs. Implements part of ticket 6465.
  3880. - Make a channel_tls_t subclass of channel_t, adapting it to the
  3881. existing or_connection_t code. The V2/V3 protocol handshaking
  3882. code which formerly resided in command.c has been moved below the
  3883. channel_t abstraction layer and may be found in channeltls.c now.
  3884. Implements the rest of ticket 6465.
  3885. - Introduce new circuitmux_t storing the queue of circuits for
  3886. a channel; this encapsulates and abstracts the queue logic and
  3887. circuit selection policy, and allows the latter to be overridden
  3888. easily by switching out a policy object. The existing EWMA behavior
  3889. is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
  3890. o New build requirements:
  3891. - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
  3892. strongly recommended.
  3893. - Tor maintainers now require Automake version 1.9 or later to build
  3894. Tor from the Git repository. (Automake is not required when building
  3895. from a source distribution.)
  3896. o Minor features (protocol):
  3897. - No longer include the "opt" prefix when generating routerinfos
  3898. or v2 directories: it has been needless since Tor 0.1.2. Closes
  3899. ticket 5124.
  3900. - Reject EXTEND cells sent to nonexistent streams. According to the
  3901. spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
  3902. we were only checking for stream IDs that were currently in use.
  3903. Found while hunting for more instances of bug 6271. Bugfix on
  3904. 0.0.2pre8, which introduced incremental circuit construction.
  3905. - Tor relays and clients now support a better CREATE/EXTEND cell
  3906. format, allowing the sender to specify multiple address, identity,
  3907. and handshake types. Implements Robert Ransom's proposal 200;
  3908. closes ticket 7199.
  3909. - Reject as invalid most directory objects containing a NUL.
  3910. Belt-and-suspender fix for bug 8037.
  3911. o Minor features (security):
  3912. - Clear keys and key-derived material left on the stack in
  3913. rendservice.c and rendclient.c. Check return value of
  3914. crypto_pk_write_private_key_to_string() in rend_service_load_keys().
  3915. These fixes should make us more forward-secure against cold-boot
  3916. attacks and the like. Fixes bug 2385.
  3917. - Use our own weak RNG when we need a weak RNG. Windows's rand() and
  3918. Irix's random() only return 15 bits; Solaris's random() returns more
  3919. bits but its RAND_MAX says it only returns 15, and so on. Motivated
  3920. by the fix for bug 7801; bugfix on
  3921. o Minor features (control protocol):
  3922. - Add a "GETINFO signal/names" control port command. Implements
  3923. ticket 3842.
  3924. - Provide default values for all options via "GETINFO config/defaults".
  3925. Implements ticket 4971.
  3926. - Allow an optional $ before the node identity digest in the
  3927. controller command GETINFO ns/id/<identity>, for consistency with
  3928. md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
  3929. - Add CACHED keyword to ADDRMAP events in the control protocol
  3930. to indicate whether a DNS result will be cached or not. Resolves
  3931. ticket 8596.
  3932. - Generate bootstrapping status update events correctly when fetching
  3933. microdescriptors. Fixes bug 9927.
  3934. o Minor features (path selection):
  3935. - When deciding whether we have enough descriptors to build circuits,
  3936. instead of looking at raw relay counts, look at which fraction
  3937. of (bandwidth-weighted) paths we're able to build. This approach
  3938. keeps clients from building circuits if their paths are likely to
  3939. stand out statistically. The default fraction of paths needed is
  3940. taken from the consensus directory; you can override it with the
  3941. new PathsNeededToBuildCircuits option. Fixes ticket 5956.
  3942. - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
  3943. and we have GeoIP information, also exclude all nodes with unknown
  3944. countries "??" and "A1". This behavior is controlled by the
  3945. new GeoIPExcludeUnknown option: you can make such nodes always
  3946. excluded with "GeoIPExcludeUnknown 1", and disable the feature
  3947. with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
  3948. gets you the default behavior. Implements feature 7706.
  3949. o Minor features (hidden services):
  3950. - Improve circuit build timeout handling for hidden services.
  3951. In particular: adjust build timeouts more accurately depending
  3952. upon the number of hop-RTTs that a particular circuit type
  3953. undergoes. Additionally, launch intro circuits in parallel
  3954. if they timeout, and take the first one to reply as valid.
  3955. - The Tor client now ignores sub-domain components of a .onion
  3956. address. This change makes HTTP "virtual" hosting
  3957. possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
  3958. http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
  3959. hosted on the same hidden service. Implements proposal 204.
  3960. - Enable Tor to read configuration, state, and key information from
  3961. a FIFO. Previously Tor would only read from files with a positive
  3962. stat.st_size. Code from meejah; fixes bug 6044.
  3963. o Minor features (clients):
  3964. - Teach bridge-using clients to avoid 0.2.2.x bridges when making
  3965. microdescriptor-related dir requests, and only fall back to normal
  3966. descriptors if none of their bridges can handle microdescriptors
  3967. (as opposed to the fix in ticket 4013, which caused them to fall
  3968. back to normal descriptors if *any* of their bridges preferred
  3969. them). Resolves ticket 4994.
  3970. - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
  3971. TCP ports to forward. In the past it only accepted two ports:
  3972. the ORPort and the DirPort.
  3973. o Minor features (protecting client timestamps):
  3974. - Clients no longer send timestamps in their NETINFO cells. These were
  3975. not used for anything, and they provided one small way for clients
  3976. to be distinguished from each other as they moved from network to
  3977. network or behind NAT. Implements part of proposal 222.
  3978. - Clients now round timestamps in INTRODUCE cells down to the nearest
  3979. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  3980. if it's set to "auto" and the feature is disabled in the consensus,
  3981. the timestamp is sent as 0 instead. Implements part of proposal 222.
  3982. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  3983. a big deal from a security point of view, but it achieves no actual
  3984. good purpose, and isn't needed. Implements part of proposal 222.
  3985. - Reduce down accuracy of timestamps in hidden service descriptors.
  3986. Implements part of proposal 222.
  3987. o Minor features (bridges):
  3988. - Make bridge relays check once a minute for whether their IP
  3989. address has changed, rather than only every 15 minutes. Resolves
  3990. bugs 1913 and 1992.
  3991. - Bridge statistics now count bridge clients connecting over IPv6:
  3992. bridge statistics files now list "bridge-ip-versions" and
  3993. extra-info documents list "geoip6-db-digest". The control protocol
  3994. "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
  3995. implementation by "shkoo", addressing ticket 5055.
  3996. - Add a new torrc option "ServerTransportListenAddr" to let bridge
  3997. operators select the address where their pluggable transports will
  3998. listen for connections. Resolves ticket 7013.
  3999. - Randomize the lifetime of our SSL link certificate, so censors can't
  4000. use the static value for filtering Tor flows. Resolves ticket 8443;
  4001. related to ticket 4014 which was included in
  4002. o Minor features (relays):
  4003. - Option OutboundBindAddress can be specified multiple times and
  4004. accepts IPv6 addresses. Resolves ticket 6876.
  4005. o Minor features (IPv6, client side):
  4006. - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
  4007. prefer to hand out virtual IPv6 addresses, since there are more of
  4008. them and we can't run out. To override this behavior and make IPv4
  4009. addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
  4010. or DNSPort you're using for resolving. Implements ticket 7571.
  4011. - AutomapHostsOnResolve responses are now randomized, to avoid
  4012. annoying situations where Tor is restarted and applications
  4013. connect to the wrong addresses.
  4014. - Never try more than 1000 times to pick a new virtual address when
  4015. AutomapHostsOnResolve is set. That's good enough so long as we
  4016. aren't close to handing out our entire virtual address space;
  4017. if you're getting there, it's best to switch to IPv6 virtual
  4018. addresses anyway.
  4019. o Minor features (IPv6, relay/authority side):
  4020. - New config option "AuthDirHasIPv6Connectivity 1" that directory
  4021. authorities should set if they have IPv6 connectivity and want to
  4022. do reachability tests for IPv6 relays. Implements feature 5974.
  4023. - A relay with an IPv6 OR port now sends that address in NETINFO
  4024. cells (in addition to its other address). Implements ticket 6364.
  4025. o Minor features (directory authorities):
  4026. - Directory authorities no long accept descriptors for any version of
  4027. Tor before, or for any 0.2.3 release before
  4028. These versions are insecure, unsupported, or both. Implements
  4029. ticket 6789.
  4030. - When directory authorities are computing thresholds for flags,
  4031. never let the threshold for the Fast flag fall below 4096
  4032. bytes. Also, do not consider nodes with extremely low bandwidths
  4033. when deciding thresholds for various directory flags. This change
  4034. should raise our threshold for Fast relays, possibly in turn
  4035. improving overall network performance; see ticket 1854. Resolves
  4036. ticket 8145.
  4037. - Directory authorities now include inside each vote a statement of
  4038. the performance thresholds they used when assigning flags.
  4039. Implements ticket 8151.
  4040. - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
  4041. in directory authority votes to describe whether they have enough
  4042. measured bandwidths to ignore advertised (relay descriptor)
  4043. bandwidth claims. Resolves ticket 8711.
  4044. o Minor features (path bias detection):
  4045. - Path Use Bias: Perform separate accounting for successful circuit
  4046. use. Keep separate statistics on stream attempt rates versus stream
  4047. success rates for each guard. Provide configurable thresholds to
  4048. determine when to emit log messages or disable use of guards that
  4049. fail too many stream attempts. Resolves ticket 7802.
  4050. - Create three levels of Path Bias log messages, as opposed to just
  4051. two. These are configurable via consensus as well as via the torrc
  4052. options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
  4053. The default values are 0.70, 0.50, and 0.30 respectively.
  4054. - Separate the log message levels from the decision to drop guards,
  4055. which also is available via torrc option PathBiasDropGuards.
  4056. PathBiasDropGuards still defaults to 0 (off).
  4057. - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
  4058. in combination with PathBiasExtremeRate.
  4059. - Increase the default values for PathBiasScaleThreshold and
  4060. PathBiasCircThreshold from (200, 20) to (300, 150).
  4061. - Add in circuit usage accounting to path bias. If we try to use a
  4062. built circuit but fail for any reason, it counts as path bias.
  4063. Certain classes of circuits where the adversary gets to pick your
  4064. destination node are exempt from this accounting. Usage accounting
  4065. can be specifically disabled via consensus parameter or torrc.
  4066. - Convert all internal path bias state to double-precision floating
  4067. point, to avoid roundoff error and other issues.
  4068. - Only record path bias information for circuits that have completed
  4069. *two* hops. Assuming end-to-end tagging is the attack vector, this
  4070. makes us more resilient to ambient circuit failure without any
  4071. detection capability loss.
  4072. o Minor features (build):
  4073. - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
  4074. dhill. Resolves ticket 6982.
  4075. - Compile on win64 using mingw64. Fixes bug 7260; patches from
  4076. "yayooo".
  4077. - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
  4078. separate error codes; or at least, don't break for that reason.
  4079. Fixes bug 7935. Reported by "oftc_must_be_destroyed".
  4080. o Build improvements (autotools):
  4081. - Warn if building on a platform with an unsigned time_t: there
  4082. are too many places where Tor currently assumes that time_t can
  4083. hold negative values. We'd like to fix them all, but probably
  4084. some will remain.
  4085. - Do not report status verbosely from unless the -v flag
  4086. is specified. Fixes issue 4664. Patch from Onizuka.
  4087. - Detect and reject attempts to build Tor with threading support
  4088. when OpenSSL has been compiled without threading support.
  4089. Fixes bug 6673.
  4090. - Try to detect if we are ever building on a platform where
  4091. memset(...,0,...) does not set the value of a double to 0.0. Such
  4092. platforms are permitted by the C standard, though in practice
  4093. they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
  4094. currently support them, but it's better to detect them and fail
  4095. than to perform erroneously.
  4096. - We no longer warn so much when generating manpages from their
  4097. asciidoc source.
  4098. - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
  4099. the signs of types during autoconf. This is better than our old
  4100. approach, which didn't work when cross-compiling.
  4101. o Minor features (log messages, warnings):
  4102. - Detect when we're running with a version of OpenSSL other than the
  4103. one we compiled with. This conflict has occasionally given people
  4104. hard-to-track-down errors.
  4105. - Warn users who run hidden services on a Tor client with
  4106. UseEntryGuards disabled that their hidden services will be
  4107. vulnerable to (the
  4108. attack which motivated Tor to support entry guards in the first
  4109. place). Resolves ticket 6889.
  4110. - Warn when we are binding low ports when hibernation is enabled;
  4111. previously we had warned when we were _advertising_ low ports with
  4112. hibernation enabled. Fixes bug 7285; bugfix on
  4113. - Issue a warning when running with the bufferevents backend enabled.
  4114. It's still not stable, and people should know that they're likely
  4115. to hit unexpected problems. Closes ticket 9147.
  4116. o Minor features (log messages, notices):
  4117. - Refactor resolve_my_address() so it returns the method by which we
  4118. decided our public IP address (explicitly configured, resolved from
  4119. explicit hostname, guessed from interfaces, learned by gethostname).
  4120. Now we can provide more helpful log messages when a relay guesses
  4121. its IP address incorrectly (e.g. due to unexpected lines in
  4122. /etc/hosts). Resolves ticket 2267.
  4123. - Track how many "TAP" and "NTor" circuit handshake requests we get,
  4124. and how many we complete, and log it every hour to help relay
  4125. operators follow trends in network load. Addresses ticket 9658.
  4126. o Minor features (log messages, diagnostics):
  4127. - If we fail to free a microdescriptor because of bug 7164, log
  4128. the filename and line number from which we tried to free it.
  4129. - We compute the overhead from passing onionskins back and forth to
  4130. cpuworkers, and report it when dumping statistics in response to
  4131. SIGUSR1. Supports ticket 7291.
  4132. - Add another diagnostic to the heartbeat message: track and log
  4133. overhead that TLS is adding to the data we write. If this is
  4134. high, we are sending too little data to SSL_write at a time.
  4135. Diagnostic for bug 7707.
  4136. - Log packaged cell fullness as part of the heartbeat message.
  4137. Diagnosis to try to determine the extent of bug 7743.
  4138. - Add more detail to a log message about relaxed timeouts, to help
  4139. track bug 7799.
  4140. - When learning a fingerprint for a bridge, log its corresponding
  4141. transport type. Implements ticket 7896.
  4142. - Warn more aggressively when flushing microdescriptors to a
  4143. microdescriptor cache fails, in an attempt to mitigate bug 8031,
  4144. or at least make it more diagnosable.
  4145. - Improve the log message when "Bug/attack: unexpected sendme cell
  4146. from client" occurs, to help us track bug 8093.
  4147. - Improve debugging output to help track down bug 8185 ("Bug:
  4148. outgoing relay cell has n_chan==NULL. Dropping.")
  4149. o Minor features (log messages, quieter bootstrapping):
  4150. - Log fewer lines at level "notice" about our OpenSSL and Libevent
  4151. versions and capabilities when everything is going right. Resolves
  4152. part of ticket 6736.
  4153. - Omit the first heartbeat log message, because it never has anything
  4154. useful to say, and it clutters up the bootstrapping messages.
  4155. Resolves ticket 6758.
  4156. - Don't log about reloading the microdescriptor cache at startup. Our
  4157. bootstrap warnings are supposed to tell the user when there's a
  4158. problem, and our bootstrap notices say when there isn't. Resolves
  4159. ticket 6759; bugfix on
  4160. - Don't log "I learned some more directory information" when we're
  4161. reading cached directory information. Reserve it for when new
  4162. directory information arrives in response to a fetch. Resolves
  4163. ticket 6760.
  4164. - Don't complain about bootstrapping problems while hibernating.
  4165. These complaints reflect a general code problem, but not one
  4166. with any problematic effects (no connections are actually
  4167. opened). Fixes part of bug 7302; bugfix on
  4168. o Minor features (testing):
  4169. - In our testsuite, create temporary directories with a bit more
  4170. entropy in their name to make name collisions less likely. Fixes
  4171. bug 8638.
  4172. - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
  4173. (P-256) Diffie-Hellman handshakes to src/or/bench.
  4174. - Add benchmark functions to test onion handshake performance.
  4175. o Renamed options:
  4176. - The DirServer option is now DirAuthority, for consistency with
  4177. current naming patterns. You can still use the old DirServer form.
  4178. o Minor bugfixes (protocol):
  4179. - Fix the handling of a TRUNCATE cell when it arrives while the
  4180. circuit extension is in progress. Fixes bug 7947; bugfix on
  4181. - When a Tor client gets a "truncated" relay cell, the first byte of
  4182. its payload specifies why the circuit was truncated. We were
  4183. ignoring this 'reason' byte when tearing down the circuit, resulting
  4184. in the controller not being told why the circuit closed. Now we
  4185. pass the reason from the truncated cell to the controller. Bugfix
  4186. on; fixes bug 7039.
  4187. - Fix a misframing issue when reading the version numbers in a
  4188. VERSIONS cell. Previously we would recognize [00 01 00 02] as
  4189. 'version 1, version 2, and version 0x100', when it should have
  4190. only included versions 1 and 2. Fixes bug 8059; bugfix on
  4191. Reported pseudonymously.
  4192. - Make the format and order of STREAM events for DNS lookups
  4193. consistent among the various ways to launch DNS lookups. Fixes
  4194. bug 8203; bugfix on Patch by "Desoxy".
  4195. o Minor bugfixes (syscalls and disk interaction):
  4196. - Always check the return values of functions fcntl() and
  4197. setsockopt(). We don't believe these are ever actually failing in
  4198. practice, but better safe than sorry. Also, checking these return
  4199. values should please analysis tools like Coverity. Patch from
  4200. 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
  4201. - Avoid double-closing the listener socket in our socketpair()
  4202. replacement (used on Windows) in the case where the addresses on
  4203. our opened sockets don't match what we expected. Fixes bug 9400;
  4204. bugfix on 0.0.2pre7. Found by Coverity.
  4205. - Correctly store microdescriptors and extrainfo descriptors that
  4206. include an internal NUL byte. Fixes bug 8037; bugfix on
  4207. Bug reported by "cypherpunks".
  4208. - If for some reason we fail to write a microdescriptor while
  4209. rebuilding the cache, do not let the annotations from that
  4210. microdescriptor linger in the cache file, and do not let the
  4211. microdescriptor stay recorded as present in its old location.
  4212. Fixes bug 9047; bugfix on
  4213. - Use direct writes rather than stdio when building microdescriptor
  4214. caches, in an attempt to mitigate bug 8031, or at least make it
  4215. less common.
  4216. o Minor fixes (config options):
  4217. - Warn and fail if a server is configured not to advertise any
  4218. ORPorts at all. (We need *something* to put in our descriptor,
  4219. or we just won't work.)
  4220. - Behave correctly when the user disables LearnCircuitBuildTimeout
  4221. but doesn't tell us what they would like the timeout to be. Fixes
  4222. bug 6304; bugfix on
  4223. - Rename the (internal-use-only) UsingTestingNetworkDefaults option
  4224. to start with a triple-underscore so the controller won't touch it.
  4225. Patch by Meejah. Fixes bug 3155. Bugfix on
  4226. - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
  4227. so it doesn't start with _. Fixes bug 3155. Bugfix on
  4228. - When autodetecting the number of CPUs, use the number of available
  4229. CPUs in preference to the number of configured CPUs. Inform the
  4230. user if this reduces the number of available CPUs. Fixes bug 8002;
  4231. bugfix on
  4232. - Command-line option "--version" implies "--quiet". Fixes bug 6997.
  4233. - Make it an error when you set EntryNodes but disable UseGuardNodes,
  4234. since it will (surprisingly to some users) ignore EntryNodes. Fixes
  4235. bug 8180; bugfix on
  4236. - Avoid overflows when the user sets MaxCircuitDirtiness to a
  4237. ridiculously high value, by imposing a (ridiculously high) 30-day
  4238. maximum on MaxCircuitDirtiness.
  4239. o Minor bugfixes (control protocol):
  4240. - Stop sending a stray "(null)" in some cases for the server status
  4241. "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
  4242. on
  4243. - The ADDRMAP command can no longer generate an ill-formed error
  4244. code on a failed MAPADDRESS. It now says "internal" rather than
  4245. an English sentence fragment with spaces in the middle. Bugfix on
  4246. Tor
  4247. o Minor bugfixes (clients / edges):
  4248. - When we receive a RELAY_END cell with the reason DONE, or with no
  4249. reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
  4250. status as "connection refused". Previously we reported these cases
  4251. as success but then immediately closed the connection. Fixes bug
  4252. 7902; bugfix on Reported by "oftc_must_be_destroyed".
  4253. - If the guard we choose first doesn't answer, we would try the
  4254. second guard, but once we connected to the second guard we would
  4255. abandon it and retry the first one, slowing down bootstrapping.
  4256. The fix is to treat all our initially chosen guards as acceptable
  4257. to use. Fixes bug 9946; bugfix on
  4258. - When choosing which stream on a formerly stalled circuit to wake
  4259. first, make better use of the platform's weak RNG. Previously,
  4260. we had been using the % ("modulo") operator to try to generate a
  4261. 1/N chance of picking each stream, but this behaves badly with
  4262. many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
  4264. o Minor bugfixes (path bias detection):
  4265. - If the state file's path bias counts are invalid (presumably from a
  4266. buggy Tor prior to, make them correct. Also add
  4267. additional checks and log messages to the scaling of Path Bias
  4268. counts, in case there still are remaining issues with scaling.
  4269. Should help resolve bug 8235.
  4270. - Prevent rounding error in path bias counts when scaling
  4271. them down, and use the correct scale factor default. Also demote
  4272. some path bias related log messages down a level and make others
  4273. less scary sounding. Fixes bug 6647. Bugfix on
  4274. - Remove a source of rounding error during path bias count scaling;
  4275. don't count cannibalized circuits as used for path bias until we
  4276. actually try to use them; and fix a circuit_package_relay_cell()
  4277. warning message about n_chan==NULL. Fixes bug 7802.
  4278. - Paste the description for PathBias parameters from the man
  4279. page into or.h, so the code documents them too. Fixes bug 7982;
  4280. bugfix on
  4281. o Minor bugfixes (relays):
  4282. - Stop trying to resolve our hostname so often (e.g. every time we
  4283. think about doing a directory fetch). Now we reuse the cached
  4284. answer in some cases. Fixes bugs 1992 (bugfix on
  4285. and 2410 (bugfix on
  4286. - When examining the list of network interfaces to find our address,
  4287. do not consider non-running or disabled network interfaces. Fixes
  4288. bug 9904; bugfix on Patch from "hantwister".
  4289. o Minor bugfixes (blocking resistance):
  4290. - Only disable TLS session ticket support when running as a TLS
  4291. server. Now clients will blend better with regular Firefox
  4292. connections. Fixes bug 7189; bugfix on Tor
  4293. o Minor bugfixes (IPv6):
  4294. - Use square brackets around IPv6 addresses in numerous places
  4295. that needed them, including log messages, HTTPS CONNECT proxy
  4296. requests, TransportProxy statefile entries, and pluggable transport
  4297. extra-info lines. Fixes bug 7011; patch by David Fifield.
  4298. o Minor bugfixes (directory authorities):
  4299. - Reject consensus votes with more than 64 known-flags. We aren't even
  4300. close to that limit yet, and our code doesn't handle it correctly.
  4301. Fixes bug 6833; bugfix on
  4302. - Correctly handle votes with more than 31 flags. Fixes bug 6853;
  4303. bugfix on
  4304. o Minor bugfixes (memory leaks):
  4305. - Avoid leaking memory if we fail to compute a consensus signature
  4306. or we generate a consensus we can't parse. Bugfix on
  4307. - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
  4308. on; fixes bug 7816.
  4309. - Fix a memory leak during safe-cookie controller authentication.
  4310. Bugfix on; fixes bug 7816.
  4311. - Free some more still-in-use memory at exit, to make hunting for
  4312. memory leaks easier. Resolves bug 7029.
  4313. o Minor bugfixes (code correctness):
  4314. - Increase the width of the field used to remember a connection's
  4315. link protocol version to two bytes. Harmless for now, since the
  4316. only currently recognized versions are one byte long. Reported
  4317. pseudonymously. Fixes bug 8062; bugfix on
  4318. - Fix a crash when debugging unit tests on Windows: deallocate a
  4319. shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
  4320. bugfix on Reported by "ultramage".
  4321. - When detecting the largest possible file descriptor (in order to
  4322. close all file descriptors when launching a new program), actually
  4323. use _SC_OPEN_MAX. The old code for doing this was very, very broken.
  4324. Fixes bug 8209; bugfix on Found by Coverity; this
  4325. is CID 743383.
  4326. - Avoid a crash if we fail to generate an extrainfo descriptor.
  4327. Fixes bug 8208; bugfix on Found by Coverity;
  4328. this is CID 718634.
  4329. - Avoid an off-by-one error when checking buffer boundaries when
  4330. formatting the exit status of a pluggable transport helper.
  4331. This is probably not an exploitable bug, but better safe than
  4332. sorry. Fixes bug 9928; bugfix on Bug found by
  4333. Pedro Ribeiro.
  4334. - Get rid of a couple of harmless clang warnings, where we compared
  4335. enums to ints. These warnings are newly introduced in clang 3.2.
  4336. o Minor bugfixes (code cleanliness):
  4337. - Avoid use of reserved identifiers in our C code. The C standard
  4338. doesn't like us declaring anything that starts with an
  4339. underscore, so let's knock it off before we get in trouble. Fix
  4340. for bug 1031; bugfix on the first Tor commit.
  4341. - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
  4342. with large values. This situation was untriggered, but nevertheless
  4343. incorrect. Fixes bug 6831; bugfix on
  4344. - Fix an impossible buffer overrun in the AES unit tests. Fixes
  4345. bug 8845; bugfix on Found by eugenis.
  4346. - Fix handling of rendezvous client authorization types over 8.
  4347. Fixes bug 6861; bugfix on
  4348. - Remove a couple of extraneous semicolons that were upsetting the
  4349. cparser library. Patch by Christian Grothoff. Fixes bug 7115;
  4350. bugfix on
  4351. - When complaining about a client port on a public address, log
  4352. which address we're complaining about. Fixes bug 4020; bugfix on
  4353. Patch by Tom Fitzhenry.
  4354. o Minor bugfixes (log messages, warnings):
  4355. - If we encounter a write failure on a SOCKS connection before we
  4356. finish our SOCKS handshake, don't warn that we closed the
  4357. connection before we could send a SOCKS reply. Fixes bug 8427;
  4358. bugfix on
  4359. - Fix a directory authority warn caused when we have a large amount
  4360. of badexit bandwidth. Fixes bug 8419; bugfix on
  4361. - Downgrade "Failed to hand off onionskin" messages to "debug"
  4362. severity, since they're typically redundant with the "Your computer
  4363. is too slow" messages. Fixes bug 7038; bugfix on
  4364. - Avoid spurious warnings when configuring multiple client ports of
  4365. which only some are nonlocal. Previously, we had claimed that some
  4366. were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
  4368. o Minor bugfixes (log messages, other):
  4369. - Fix log messages and comments to avoid saying "GMT" when we mean
  4370. "UTC". Fixes bug 6113.
  4371. - When rejecting a configuration because we were unable to parse a
  4372. quoted string, log an actual error message. Fixes bug 7950; bugfix
  4373. on
  4374. - Correctly recognize that [::1] is a loopback address. Fixes
  4375. bug 8377; bugfix on
  4376. - Don't log inappropriate heartbeat messages when hibernating: a
  4377. hibernating node is _expected_ to drop out of the consensus,
  4378. decide it isn't bootstrapped, and so forth. Fixes bug 7302;
  4379. bugfix on
  4380. - Eliminate several instances where we use "Nickname=ID" to refer to
  4381. nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
  4382. "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
  4383. on
  4384. o Minor bugfixes (build):
  4385. - Fix some bugs in tor-fw-helper-natpmp when trying to build and
  4386. run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
  4387. Fixes bug 7280; bugfix on
  4388. o Documentation fixes:
  4389. - Make the torify manpage no longer refer to tsocks; torify hasn't
  4390. supported tsocks since
  4391. - Make the tor manpage no longer reference tsocks.
  4392. - Fix the GeoIPExcludeUnknown documentation to refer to
  4393. ExcludeExitNodes rather than the currently nonexistent
  4394. ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
  4395. - Resolve a typo in Fixes bug 6819; bugfix on
  4397. - Say "KBytes" rather than "KB" in the man page (for various values
  4398. of K), to further reduce confusion about whether Tor counts in
  4399. units of memory or fractions of units of memory. Resolves ticket 7054.
  4400. - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
  4401. names match. Fixes bug 7768.
  4402. - Fix the documentation of HeartbeatPeriod to say that the heartbeat
  4403. message is logged at notice, not at info.
  4404. - Clarify the usage and risks of setting the ContactInfo torrc line
  4405. for your relay or bridge. Resolves ticket 9854.
  4406. - Add anchors to the manpage so we can link to the html version of
  4407. the documentation for specific options. Resolves ticket 9866.
  4408. - Replace remaining references to DirServer in man page and
  4409. log entries. Resolves ticket 10124.
  4410. o Removed features:
  4411. - Stop exporting estimates of v2 and v3 directory traffic shares
  4412. in extrainfo documents. They were unneeded and sometimes inaccurate.
  4413. Also stop exporting any v2 directory request statistics. Resolves
  4414. ticket 5823.
  4415. - Drop support for detecting and warning about versions of Libevent
  4416. before 1.3e. Nothing reasonable ships with them any longer; warning
  4417. the user about them shouldn't be needed. Resolves ticket 6826.
  4418. - Now that all versions before 0.2.2.x are disallowed, we no longer
  4419. need to work around their missing features. Remove a bunch of
  4420. compatibility code.
  4421. o Removed files:
  4422. - The tor-tsocks.conf is no longer distributed or installed. We
  4423. recommend that tsocks users use torsocks instead. Resolves
  4424. ticket 8290.
  4425. - Remove some of the older contents of doc/ as obsolete; move others
  4426. to torspec.git. Fixes bug 8965.
  4427. o Code simplification:
  4428. - Avoid using character buffers when constructing most directory
  4429. objects: this approach was unwieldy and error-prone. Instead,
  4430. build smartlists of strings, and concatenate them when done.
  4431. - Rename "isin" functions to "contains", for grammar. Resolves
  4432. ticket 5285.
  4433. - Rename Tor's logging function log() to tor_log(), to avoid conflicts
  4434. with the natural logarithm function from the system libm. Resolves
  4435. ticket 7599.
  4436. - Start using OpenBSD's implementation of queue.h, so that we don't
  4437. need to hand-roll our own pointer and list structures whenever we
  4438. need them. (We can't rely on a sys/queue.h, since some operating
  4439. systems don't have them, and the ones that do have them don't all
  4440. present the same extensions.)
  4441. - Start using OpenBSD's implementation of queue.h (originally by
  4442. Niels Provos).
  4443. - Enhance our internal sscanf replacement so that we can eliminate
  4444. the last remaining uses of the system sscanf. (Though those uses
  4445. of sscanf were safe, sscanf itself is generally error prone, so
  4446. we want to eliminate when we can.) Fixes ticket 4195 and Coverity
  4447. CID 448.
  4448. - Replace all calls to snprintf() outside of src/ext with
  4449. tor_snprintf(). Also remove the #define to replace snprintf with
  4450. _snprintf on Windows; they have different semantics, and all of
  4451. our callers should be using tor_snprintf() anyway. Fixes bug 7304.
  4452. o Refactoring:
  4453. - Add a wrapper function for the common "log a message with a
  4454. rate-limit" case.
  4455. - Split the onion.c file into separate modules for the onion queue
  4456. and the different handshakes it supports.
  4457. - Move the client-side address-map/virtual-address/DNS-cache code
  4458. out of connection_edge.c into a new addressmap.c module.
  4459. - Move the entry node code from circuitbuild.c to its own file.
  4460. - Move the circuit build timeout tracking code from circuitbuild.c
  4461. to its own file.
  4462. - Source files taken from other packages now reside in src/ext;
  4463. previously they were scattered around the rest of Tor.
  4464. - Move the generic "config" code into a new file, and have "config.c"
  4465. hold only torrc- and state-related code. Resolves ticket 6823.
  4466. - Move the core of our "choose a weighted element at random" logic
  4467. into its own function, and give it unit tests. Now the logic is
  4468. testable, and a little less fragile too.
  4469. - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
  4470. - Move last_reachable and testing_since from routerinfo_t to node_t.
  4471. Implements ticket 5529.
  4472. - Add replaycache_t structure, functions and unit tests, then refactor
  4473. rend_service_introduce() to be more clear to read, improve, debug,
  4474. and test. Resolves bug 6177.
  4475. o Removed code:
  4476. - Remove some now-needless code that tried to aggressively flush
  4477. OR connections as data was added to them. Since, our
  4478. cell queue logic has saved us from the failure mode that this code
  4479. was supposed to prevent. Removing this code will limit the number
  4480. of baroque control flow paths through Tor's network logic. Reported
  4481. pseudonymously on IRC. Fixes bug 6468; bugfix on
  4482. - Remove unused code for parsing v1 directories and "running routers"
  4483. documents. Fixes bug 6887.
  4484. - Remove the marshalling/unmarshalling code for sending requests to
  4485. cpuworkers over a socket, and instead just send structs. The
  4486. recipient will always be the same Tor binary as the sender, so
  4487. any encoding is overkill.
  4488. - Remove the testing_since field of node_t, which hasn't been used
  4489. for anything since
  4490. - Finally remove support for malloc_good_size and malloc_usable_size.
  4491. We had hoped that these functions would let us eke a little more
  4492. memory out of our malloc implementation. Unfortunately, the only
  4493. implementations that provided these functions are also ones that
  4494. are already efficient about not overallocation: they never got us
  4495. more than 7 or so bytes per allocation. Removing them saves us a
  4496. little code complexity and a nontrivial amount of build complexity.
  4497. Changes in version - 2012-11-19
  4498. The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
  4499. Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
  4500. Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
  4501. programmer, and friend. Unstinting in his dedication to the cause of
  4502. freedom, he inspired and helped many of us as we began our work on
  4503. anonymity, and inspires us still. Please honor his memory by writing
  4504. software to protect people's freedoms, and by helping others to do so.
  4505. Tor, the first stable release in the 0.2.3 branch, features
  4506. significantly reduced directory overhead (via microdescriptors),
  4507. enormous crypto performance improvements for fast relays on new
  4508. enough hardware, a new v3 TLS handshake protocol that can better
  4509. resist fingerprinting, support for protocol obfuscation plugins (aka
  4510. pluggable transports), better scalability for hidden services, IPv6
  4511. support for bridges, performance improvements like allowing clients
  4512. to skip the first round-trip on the circuit ("optimistic data") and
  4513. refilling token buckets more often, a new "stream isolation" design
  4514. to isolate different applications on different circuits, and many
  4515. stability, security, and privacy fixes.
  4516. Major features (v3 directory protocol):
  4517. - Clients now use microdescriptors instead of regular descriptors
  4518. to build circuits. Microdescriptors are authority-generated
  4519. summaries of regular descriptors' contents, designed to change very
  4520. rarely (see proposal 158 for details). This feature is designed
  4521. to save bandwidth, especially for clients on slow internet
  4522. connections. Use "UseMicrodescriptors 0" to disable it.
  4523. - Caches now download, cache, and serve microdescriptors, as well
  4524. as multiple "flavors" of the consensus, including a flavor that
  4525. describes microdescriptors.
  4526. o Major features (build hardening):
  4527. - Enable gcc and ld hardening by default. Resolves ticket 5210.
  4528. o Major features (relay scaling):
  4529. - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
  4530. instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
  4531. vectorized AES implementations as appropriate. These can be much,
  4532. much faster than other AES implementations.
  4533. - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
  4534. implementation. It makes AES_CTR about 7% faster than our old one
  4535. (which was about 10% faster than the one OpenSSL used to provide).
  4536. Resolves ticket 4526.
  4537. - Use OpenSSL's EVP interface for AES encryption, so that all AES
  4538. operations can use hardware acceleration (if present). Resolves
  4539. ticket 4442.
  4540. - Unconditionally use OpenSSL's AES implementation instead of our
  4541. old built-in one. OpenSSL's AES has been better for a while, and
  4542. relatively few servers should still be on any version of OpenSSL
  4543. that doesn't have good optimized assembly AES.
  4544. o Major features (blocking resistance):
  4545. - Update TLS cipher list to match Firefox 8 and later. Resolves
  4546. ticket 4744.
  4547. - Remove support for clients falsely claiming to support standard
  4548. ciphersuites that they can actually provide. As of modern OpenSSL
  4549. versions, it's not necessary to fake any standard ciphersuite,
  4550. and doing so prevents us from using better ciphersuites in the
  4551. future, since servers can't know whether an advertised ciphersuite
  4552. is really supported or not. Some hosts -- notably, ones with very
  4553. old versions of OpenSSL or where OpenSSL has been built with ECC
  4554. disabled -- will stand out because of this change; TBB users should
  4555. not be affected. Implements the client side of proposal 198.
  4556. - Implement a new handshake protocol (v3) for authenticating Tors to
  4557. each other over TLS. It should be more resistant to fingerprinting
  4558. than previous protocols, and should require less TLS hacking for
  4559. future Tor implementations. Implements proposal 176.
  4560. - Allow variable-length padding cells, to disguise the length of
  4561. Tor's TLS records. Implements part of proposal 184.
  4562. - While we're trying to bootstrap, record how many TLS connections
  4563. fail in each state, and report which states saw the most failures
  4564. in response to any bootstrap failures. This feature may speed up
  4565. diagnosis of censorship events. Implements ticket 3116.
  4566. o Major features (pluggable transports):
  4567. - Clients and bridges can now be configured to use a separate
  4568. "transport" proxy. This approach makes the censorship arms race
  4569. easier by allowing bridges to use protocol obfuscation plugins.
  4570. Implements proposal 180 (tickets 2841 and 3472).
  4571. o Major features (DoS resistance):
  4572. - Now that Tor 0.2.0.x is completely deprecated, enable the final
  4573. part of "Proposal 110: Avoiding infinite length circuits" by
  4574. refusing all circuit-extend requests that do not use a relay_early
  4575. cell. This change helps Tor resist a class of denial-of-service
  4576. attacks by limiting the maximum circuit length.
  4577. - Tear down the circuit if we get an unexpected SENDME cell. Clients
  4578. could use this trick to make their circuits receive cells faster
  4579. than our flow control would have allowed, or to gum up the network,
  4580. or possibly to do targeted memory denial-of-service attacks on
  4581. entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
  4582. from July 2002, before the release of Tor 0.0.0.
  4583. o Major features (hidden services):
  4584. - Adjust the number of introduction points that a hidden service
  4585. will try to maintain based on how long its introduction points
  4586. remain in use and how many introductions they handle. Fixes
  4587. part of bug 3825.
  4588. - Add a "tor2web mode" for clients that want to connect to hidden
  4589. services non-anonymously (and possibly more quickly). As a safety
  4590. measure to try to keep users from turning this on without knowing
  4591. what they are doing, tor2web mode must be explicitly enabled at
  4592. compile time, and a copy of Tor compiled to run in tor2web mode
  4593. cannot be used as a normal Tor client. Implements feature 2553.
  4594. o Major features (IPv6):
  4595. - Clients can now connect to private bridges over IPv6. Bridges
  4596. still need at least one IPv4 address in order to connect to
  4597. other relays. Note that we don't yet handle the case where the
  4598. user has two bridge lines for the same bridge (one IPv4, one
  4599. IPv6). Implements parts of proposal 186.
  4600. o Major features (directory authorities):
  4601. - Use a more secure consensus parameter voting algorithm. Now at
  4602. least three directory authorities or a majority of them must
  4603. vote on a given parameter before it will be included in the
  4604. consensus. Implements proposal 178.
  4605. - Remove the artificially low cutoff of 20KB to guarantee the Fast
  4606. flag. In the past few years the average relay speed has picked
  4607. up, and while the "top 7/8 of the network get the Fast flag" and
  4608. "all relays with 20KB or more of capacity get the Fast flag" rules
  4609. used to have the same result, now the top 7/8 of the network has
  4610. a capacity more like 32KB. Bugfix on Fixes bug 4489.
  4611. o Major features (performance):
  4612. - Exit nodes now accept and queue data on not-yet-connected streams.
  4613. Previously, the client wasn't allowed to send data until the
  4614. stream was connected, which slowed down all connections. This
  4615. change will enable clients to perform a "fast-start" on streams
  4616. and send data without having to wait for a confirmation that the
  4617. stream has opened. Patch from Ian Goldberg; implements the server
  4618. side of Proposal 174.
  4619. - When using an exit relay running 0.2.3.x, clients can now
  4620. "optimistically" send data before the exit relay reports that
  4621. the stream has opened. This saves a round trip when starting
  4622. connections where the client speaks first (such as web browsing).
  4623. This behavior is controlled by a consensus parameter (currently
  4624. disabled). To turn it on or off manually, use the "OptimisticData"
  4625. torrc option. Implements proposal 181; code by Ian Goldberg.
  4626. - Add a new TokenBucketRefillInterval option to refill token buckets
  4627. more frequently than once per second. This should improve network
  4628. performance, alleviate queueing problems, and make traffic less
  4629. bursty. Implements proposal 183; closes ticket 3630. Design by
  4630. Florian Tschorsch and Björn Scheuermann; implementation by
  4631. Florian Tschorsch.
  4632. - Raise the threshold of server descriptors needed (75%) and exit
  4633. server descriptors needed (50%) before we will declare ourselves
  4634. bootstrapped. This will make clients start building circuits a
  4635. little later, but makes the initially constructed circuits less
  4636. skewed and less in conflict with further directory fetches. Fixes
  4637. ticket 3196.
  4638. o Major features (relays):
  4639. - Relays now try regenerating and uploading their descriptor more
  4640. frequently if they are not listed in the consensus, or if the
  4641. version of their descriptor listed in the consensus is too
  4642. old. This fix should prevent situations where a server declines
  4643. to re-publish itself because it has done so too recently, even
  4644. though the authorities decided not to list its recent-enough
  4645. descriptor. Fix for bug 3327.
  4646. o Major features (stream isolation):
  4647. - You can now configure Tor so that streams from different
  4648. applications are isolated on different circuits, to prevent an
  4649. attacker who sees your streams as they leave an exit node from
  4650. linking your sessions to one another. To do this, choose some way
  4651. to distinguish the applications: have them connect to different
  4652. SocksPorts, or have one of them use SOCKS4 while the other uses
  4653. SOCKS5, or have them pass different authentication strings to the
  4654. SOCKS proxy. Then, use the new SocksPort syntax to configure the
  4655. degree of isolation you need. This implements Proposal 171.
  4656. - There's a new syntax for specifying multiple client ports (such as
  4657. SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
  4658. multiple *Port entries with full addr:port syntax on each.
  4659. The old *ListenAddress format is still supported, but you can't
  4660. mix it with the new *Port syntax.
  4661. o Major features (bufferevents):
  4662. - Tor can now optionally build with the "bufferevents" buffered IO
  4663. backend provided by Libevent 2. To use this feature, make sure you
  4664. have the latest possible version of Libevent, and pass the
  4665. --enable-bufferevents flag to configure when building Tor from
  4666. source. This feature will make our networking code more flexible,
  4667. let us stack layers on each other, and let us use more efficient
  4668. zero-copy transports where available.
  4669. - Add experimental support for running on Windows with IOCP and no
  4670. kernel-space socket buffers. This feature is controlled by a new
  4671. "UserspaceIOCPBuffers" config option (off by default), which has
  4672. no effect unless Tor has been built with bufferevents enabled,
  4673. you're running on Windows, and you've set "DisableIOCP 0". In the
  4674. long run, this may help solve or mitigate bug 98.
  4675. o Major features (path selection):
  4676. - The EntryNodes option can now include country codes like {de} or IP
  4677. addresses or network masks. Previously we had disallowed these
  4678. options because we didn't have an efficient way to keep the list up
  4679. to date. Addresses ticket 1982, but see bug 2798 for an unresolved
  4680. issue here.
  4681. o Major features (port forwarding):
  4682. - Add support for automatic port mapping on the many home routers
  4683. that support NAT-PMP or UPnP. To build the support code, you'll
  4684. need to have the libnatpnp library and/or the libminiupnpc library,
  4685. and you'll need to enable the feature specifically by passing
  4686. "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
  4687. it on, use the new PortForwarding option.
  4688. o Major features (logging):
  4689. - Add a new 'Heartbeat' log message type to periodically log a message
  4690. describing Tor's status at level Notice. This feature is meant for
  4691. operators who log at notice, and want to make sure that their Tor
  4692. server is still working. Implementation by George Kadianakis.
  4693. - Make logging resolution configurable with a new LogTimeGranularity
  4694. option, and change the default from 1 millisecond to 1 second.
  4695. Implements enhancement 1668.
  4696. o Major features (other):
  4697. - New "DisableNetwork" config option to prevent Tor from launching any
  4698. connections or accepting any connections except on a control port.
  4699. Bundles and controllers can set this option before letting Tor talk
  4700. to the rest of the network, for example to prevent any connections
  4701. to a non-bridge address. Packages like Orbot can also use this
  4702. option to instruct Tor to save power when the network is off.
  4703. - Try to use system facilities for enumerating local interface
  4704. addresses, before falling back to our old approach (which was
  4705. binding a UDP socket, and calling getsockname() on it). That
  4706. approach was scaring OS X users whose draconian firewall
  4707. software warned about binding to UDP sockets regardless of
  4708. whether packets were sent. Now we try to use getifaddrs(),
  4709. SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
  4710. system supports. Resolves ticket 1827.
  4711. - Add experimental support for a "defaults" torrc file to be parsed
  4712. before the regular torrc. Torrc options override the defaults file's
  4713. options in the same way that the command line overrides the torrc.
  4714. The SAVECONF controller command saves only those options which
  4715. differ between the current configuration and the defaults file. HUP
  4716. reloads both files. Implements task 4552.
  4717. o New directory authorities:
  4718. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  4719. authority. Closes ticket 5749.
  4720. o Security/privacy fixes:
  4721. - Avoid read-from-freed-memory and double-free bugs that could occur
  4722. when a DNS request fails while launching it. Fixes bug 6480;
  4723. bugfix on
  4724. - Reject any attempt to extend to an internal address. Without
  4725. this fix, a router could be used to probe addresses on an internal
  4726. network to see whether they were accepting connections. Fixes bug
  4727. 6710; bugfix on 0.0.8pre1.
  4728. - Close any connection that sends unrecognized junk before the TLS
  4729. handshake. Solves an issue noted in bug 4369.
  4730. - The advertised platform of a relay now includes only its operating
  4731. system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
  4732. its service pack level (for Windows) or its CPU architecture
  4733. (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
  4734. can insert an extra string in the platform line by setting the
  4735. preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
  4736. - Disable TLS session tickets. OpenSSL's implementation was giving
  4737. our TLS session keys the lifetime of our TLS context objects, when
  4738. perfect forward secrecy would want us to discard anything that
  4739. could decrypt a link connection as soon as the link connection
  4740. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  4741. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  4742. - Tor tries to wipe potentially sensitive data after using it, so
  4743. that if some subsequent security failure exposes Tor's memory,
  4744. the damage will be limited. But we had a bug where the compiler
  4745. was eliminating these wipe operations when it decided that the
  4746. memory was no longer visible to a (correctly running) program,
  4747. hence defeating our attempt at defense in depth. We fix that
  4748. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  4749. is unlikely to optimize away. Future versions of Tor may use
  4750. a less ridiculously heavy approach for this. Fixes bug 7352.
  4751. Reported in an article by Andrey Karpov.
  4752. o Major bugfixes (crashes and asserts):
  4753. - Avoid a pair of double-free and use-after-mark bugs that can
  4754. occur with certain timings in canceled and re-received DNS
  4755. requests. Fixes bug 6472; bugfix on 0.0.7rc1.
  4756. - Fix a denial of service attack by which any directory authority
  4757. could crash all the others, or by which a single v2 directory
  4758. authority could crash everybody downloading v2 directory
  4759. information. Fixes bug 7191; bugfix on
  4760. - Fix an assert that directory authorities could trigger on sighup
  4761. during some configuration state transitions. We now don't treat
  4762. it as a fatal error when the new descriptor we just generated in
  4763. init_keys() isn't accepted. Fixes bug 4438; bugfix on
  4764. - Avoid segfault when starting up having run with an extremely old
  4765. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  4766. on
  4767. o Major bugfixes (clients):
  4768. - If we are unable to find any exit that supports our predicted ports,
  4769. stop calling them predicted, so that we don't loop and build
  4770. hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
  4771. which introduced predicted ports.
  4772. - Check at each new consensus whether our entry guards were picked
  4773. long enough ago that we should rotate them. Previously, we only
  4774. did this check at startup, which could lead to us holding a guard
  4775. indefinitely. Fixes bug 5380; bugfix on
  4776. - When fetching a bridge descriptor from a bridge authority,
  4777. always do so anonymously, whether we have been able to open
  4778. circuits or not. Partial fix for bug 1938; bugfix on
  4779. This behavior makes it *safer* to use UpdateBridgesFromAuthority,
  4780. but we'll need to wait for bug 6010 before it's actually usable.
  4781. o Major bugfixes (directory voting):
  4782. - Check more thoroughly to prevent a rogue authority from
  4783. double-voting on any consensus directory parameter. Previously,
  4784. authorities would crash in this case if the total number of
  4785. votes for any parameter exceeded the number of active voters,
  4786. but would let it pass otherwise. Partially fixes bug 5786; bugfix
  4787. on
  4788. - When computing weight parameters, behave more robustly in the
  4789. presence of a bad bwweightscale value. Previously, the authorities
  4790. would crash if they agreed on a sufficiently broken weight_scale
  4791. value; now, they use a reasonable default and carry on. Fixes the
  4792. rest of bug 5786; bugfix on
  4793. - If authorities are unable to get a v2 consensus document from other
  4794. directory authorities, they no longer fall back to fetching
  4795. them from regular directory caches. Fixes bug 5635; bugfix on
  4796., where routers stopped downloading v2 consensus
  4797. documents entirely.
  4798. o Major bugfixes (relays):
  4799. - Fix a bug handling SENDME cells on nonexistent streams that could
  4800. result in bizarre window values. Report and patch contributed
  4801. pseudonymously. Fixes part of bug 6271. This bug was introduced
  4802. before the first Tor release, in svn commit r152.
  4803. - Don't update the AccountingSoftLimitHitAt state file entry whenever
  4804. tor gets started. This prevents a wrong average bandwidth
  4805. estimate, which would cause relays to always start a new accounting
  4806. interval at the earliest possible moment. Fixes bug 2003; bugfix
  4807. on Reported by Bryon Eldridge, who also helped
  4808. immensely in tracking this bug down.
  4809. - Fix a possible crash bug when checking for deactivated circuits
  4810. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  4811. bugfix on Bug report and fix received pseudonymously.
  4812. - Set the SO_REUSEADDR socket option before we call bind() on outgoing
  4813. connections. This change should allow busy exit relays to stop
  4814. running out of available sockets as quickly. Fixes bug 4950;
  4815. bugfix on
  4816. o Major bugfixes (blocking resistance):
  4817. - Bridges no longer include their address in NETINFO cells on outgoing
  4818. OR connections, to allow them to blend in better with clients.
  4819. Removes another avenue for enumerating bridges. Reported by
  4820. "troll_un". Fixes bug 4348; bugfix on, when NETINFO
  4821. cells were introduced.
  4822. - Warn the user when HTTPProxy, but no other proxy type, is
  4823. configured. This can cause surprising behavior: it doesn't send
  4824. all of Tor's traffic over the HTTPProxy -- it sends unencrypted
  4825. directory traffic only. Resolves ticket 4663.
  4826. o Major bugfixes (hidden services):
  4827. - Improve hidden service robustness: when an attempt to connect to
  4828. a hidden service ends, be willing to refetch its hidden service
  4829. descriptors from each of the HSDir relays responsible for them
  4830. immediately. Previously, we would not consider refetching the
  4831. service's descriptors from each HSDir for 15 minutes after the last
  4832. fetch, which was inconvenient if the hidden service was not running
  4833. during the first attempt. Bugfix on; fixes bug 3335.
  4834. - Hidden services now ignore the timestamps on INTRODUCE2 cells.
  4835. They used to check that the timestamp was within 30 minutes
  4836. of their system clock, so they could cap the size of their
  4837. replay-detection cache, but that approach unnecessarily refused
  4838. service to clients with wrong clocks. Bugfix on, when
  4839. the v3 intro-point protocol (the first one which sent a timestamp
  4840. field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
  4841. - When one of a hidden service's introduction points appears to be
  4842. unreachable, stop trying it. Previously, we would keep trying
  4843. to build circuits to the introduction point until we lost the
  4844. descriptor, usually because the user gave up and restarted Tor.
  4845. Fixes part of bug 3825.
  4846. o Changes to default torrc file:
  4847. - Stop listing "socksport 9050" in torrc.sample. We open a socks
  4848. port on 9050 by default anyway, so this should not change anything
  4849. in practice.
  4850. - Stop mentioning the deprecated *ListenAddress options in
  4851. torrc.sample. Fixes bug 5438.
  4852. - Document unit of bandwidth-related options in sample torrc.
  4853. Fixes bug 5621.
  4854. - Fix broken URLs in the sample torrc file, and tell readers about
  4855. the OutboundBindAddress, ExitPolicyRejectPrivate, and
  4856. PublishServerDescriptor options. Addresses bug 4652.
  4857. o Minor features (directory authorities):
  4858. - Consider new, removed or changed IPv6 OR ports a non-cosmetic
  4859. change when the authority is deciding whether to accept a newly
  4860. uploaded descriptor. Implements ticket 6423.
  4861. - Directory authorities are now a little more lenient at accepting
  4862. older router descriptors, or newer router descriptors that don't
  4863. make big changes. This should help ameliorate past and future
  4864. issues where routers think they have uploaded valid descriptors,
  4865. but the authorities don't think so. Fix for ticket 2479.
  4866. - Authority operators can now vote for all relays in a given
  4867. set of countries to be BadDir/BadExit/Invalid/Rejected.
  4868. - Provide two consensus parameters (FastFlagMinThreshold and
  4869. FastFlagMaxThreshold) to control the range of allowable bandwidths
  4870. for the Fast directory flag. These allow authorities to run
  4871. experiments on appropriate requirements for being a "Fast" node.
  4872. The AuthDirFastGuarantee config value still applies. Implements
  4873. ticket 3946.
  4874. o Minor features (bridges / bridge authorities):
  4875. - Make bridge SSL certificates a bit more stealthy by using random
  4876. serial numbers, in the same fashion as OpenSSL when generating
  4877. self-signed certificates. Implements ticket 4584.
  4878. - Tag a bridge's descriptor as "never to be sent unencrypted".
  4879. This shouldn't matter, since bridges don't open non-anonymous
  4880. connections to the bridge authority and don't allow unencrypted
  4881. directory connections from clients, but we might as well make
  4882. sure. Closes bug 5139.
  4883. - The Bridge Authority now writes statistics on how many bridge
  4884. descriptors it gave out in total, and how many unique descriptors
  4885. it gave out. It also lists how often the most and least commonly
  4886. fetched descriptors were given out, as well as the median and
  4887. 25th/75th percentile. Implements tickets 4200 and 4294.
  4888. o Minor features (IPv6):
  4889. - Make the code that clients use to detect an address change be
  4890. IPv6-aware, so that it won't fill clients' logs with error
  4891. messages when trying to get the IPv4 address of an IPv6
  4892. connection. Implements ticket 5537.
  4893. - Relays now understand an IPv6 address when they get one from a
  4894. directory server. Resolves ticket 4875.
  4895. o Minor features (hidden services):
  4896. - Expire old or over-used hidden service introduction points.
  4897. Required by fix for bug 3460.
  4898. - Reduce the lifetime of elements of hidden services' Diffie-Hellman
  4899. public key replay-detection cache from 60 minutes to 5 minutes. This
  4900. replay-detection cache is now used only to detect multiple
  4901. INTRODUCE2 cells specifying the same rendezvous point, so we can
  4902. avoid launching multiple simultaneous attempts to connect to it.
  4903. - When a hidden service's introduction point times out, consider
  4904. trying it again during the next attempt to connect to the
  4905. HS. Previously, we would not try it again unless a newly fetched
  4906. descriptor contained it. Required by fixes for bugs 1297 and 3825.
  4907. o Minor features (relays):
  4908. - Relays now include a reason for regenerating their descriptors
  4909. in an HTTP header when uploading to the authorities. This will
  4910. make it easier to debug descriptor-upload issues in the future.
  4911. - Turn on directory request statistics by default and include them in
  4912. extra-info descriptors. Don't break if we have no GeoIP database.
  4913. - Replace files in stats/ rather than appending to them. Now that we
  4914. include statistics in extra-info descriptors, it makes no sense to
  4915. keep old statistics forever. Implements ticket 2930.
  4916. - Relays that set "ConnDirectionStatistics 1" write statistics on the
  4917. bidirectional use of connections to disk every 24 hours.
  4918. - Add a GeoIP file digest to the extra-info descriptor. Implements
  4919. ticket 1883.
  4920. o Minor features (new config options):
  4921. - New config option "DynamicDHGroups" (disabled by default) provides
  4922. each bridge with a unique prime DH modulus to be used during
  4923. SSL handshakes. This option attempts to help against censors
  4924. who might use the Apache DH modulus as a static identifier for
  4925. bridges. Addresses ticket 4548.
  4926. - New config option "DisableDebuggerAttachment" (on by default)
  4927. to prevent basic debugging attachment attempts by other processes.
  4928. Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
  4929. - Ordinarily, Tor does not count traffic from private addresses (like
  4930. or when calculating rate limits or accounting.
  4931. There is now a new option, CountPrivateBandwidth, to disable this
  4932. behavior. Patch from Daniel Cagara.
  4933. o Minor features (different behavior for old config options):
  4934. - Allow MapAddress directives to specify matches against super-domains,
  4935. as in "MapAddress * *".
  4936. Implements issue 933.
  4937. - Don't disable the DirPort when we cannot exceed our AccountingMax
  4938. limit during this interval because the effective bandwidthrate is
  4939. low enough. This is useful in a situation where AccountMax is only
  4940. used as an additional safeguard or to provide statistics.
  4941. - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
  4942. implements ticket 3439.
  4943. - When configuring a large set of nodes in EntryNodes, and there are
  4944. enough of them listed as Guard so that we don't need to consider
  4945. the non-guard entries, prefer the ones listed with the Guard flag.
  4946. - If you set the NumCPUs option to 0, Tor will now try to detect how
  4947. many CPUs you have. This is the new default behavior.
  4948. - The NodeFamily option -- which let you declare that you want to
  4949. consider nodes to be part of a family whether they list themselves
  4950. that way or not -- now allows IP address ranges and country codes.
  4951. o Minor features (new command-line config behavior):
  4952. - Slightly change behavior of "list" options (that is, config
  4953. options that can appear more than once) when they appear both in
  4954. torrc and on the command line. Previously, the command-line options
  4955. would be appended to the ones from torrc. Now, the command-line
  4956. options override the torrc options entirely. This new behavior
  4957. allows the user to override list options (like exit policies and
  4958. ports to listen on) from the command line, rather than simply
  4959. appending to the list.
  4960. - You can get the old (appending) command-line behavior for "list"
  4961. options by prefixing the option name with a "+".
  4962. - You can remove all the values for a "list" option from the command
  4963. line without adding any new ones by prefixing the option name
  4964. with a "/".
  4965. o Minor features (controller, new events):
  4966. - Extend the control protocol to report flags that control a circuit's
  4967. path selection in CIRC events and in replies to 'GETINFO
  4968. circuit-status'. Implements part of ticket 2411.
  4969. - Extend the control protocol to report the hidden service address
  4970. and current state of a hidden-service-related circuit in CIRC
  4971. events and in replies to 'GETINFO circuit-status'. Implements part
  4972. of ticket 2411.
  4973. - Include the creation time of a circuit in CIRC and CIRC2
  4974. control-port events and the list produced by the 'GETINFO
  4975. circuit-status' control-port command.
  4976. - Add a new CONF_CHANGED event so that controllers can be notified
  4977. of any configuration changes made by other controllers, or by the
  4978. user. Implements ticket 1692.
  4979. - Add a new SIGNAL event to the controller interface so that
  4980. controllers can be notified when Tor handles a signal. Resolves
  4981. issue 1955. Patch by John Brooks.
  4982. o Minor features (controller, new getinfo options):
  4983. - Expose our view of whether we have gone dormant to the controller,
  4984. via a new "GETINFO dormant" value. Torbutton and other controllers
  4985. can use this to avoid doing periodic requests through Tor while
  4986. it's dormant (bug 4718). Resolves ticket 5954.
  4987. - Add a new GETINFO option to get total bytes read and written. Patch
  4988. from pipe, revised by atagar. Resolves ticket 2345.
  4989. - Implement new GETINFO controller fields to provide information about
  4990. the Tor process's pid, euid, username, and resource limits.
  4991. o Minor features (controller, other):
  4992. - Allow controllers to request an event notification whenever a
  4993. circuit is cannibalized or its purpose is changed. Implements
  4994. part of ticket 3457.
  4995. - Use absolute path names when reporting the torrc filename in the
  4996. control protocol, so a controller can more easily find the torrc
  4997. file. Resolves bug 1101.
  4998. - When reporting the path to the cookie file to the controller,
  4999. give an absolute path. Resolves ticket 4881.
  5000. o Minor features (log messages):
  5001. - Add more information to a log statement that might help track down
  5002. bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
  5003. non-IP address" messages (or any Bug messages, for that matter!),
  5004. please let us know about it.
  5005. - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
  5006. EntryNodes will have no effect. Resolves issue 2571.
  5007. - Try to make the introductory warning message that Tor prints on
  5008. startup more useful for actually finding help and information.
  5009. Resolves ticket 2474.
  5010. - When the system call to create a listener socket fails, log the
  5011. error message explaining why. This may help diagnose bug 4027.
  5012. o Minor features (other):
  5013. - When we fail to initialize Libevent, retry with IOCP disabled so we
  5014. don't need to turn on multi-threading support in Libevent, which in
  5015. turn requires a working socketpair(). This is a workaround for bug
  5016. 4457, which affects Libevent versions from 2.0.1-alpha through
  5017. 2.0.15-stable.
  5018. - When starting as root and then changing our UID via the User
  5019. control option, and we have a ControlSocket configured, make sure
  5020. that the ControlSocket is owned by the same account that Tor will
  5021. run under. Implements ticket 3421; fix by Jérémy Bobbio.
  5022. - Accept attempts to include a password authenticator in the
  5023. handshake, as supported by SOCKS5. This handles SOCKS clients that
  5024. don't know how to omit a password when authenticating. Resolves
  5025. bug 1666.
  5026. - Check for and recover from inconsistency in the microdescriptor
  5027. cache. This will make it harder for us to accidentally free a
  5028. microdescriptor without removing it from the appropriate data
  5029. structures. Fixes issue 3135; issue noted by "wanoskarnet".
  5030. - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
  5031. o Minor bugfixes (code security):
  5032. - Prevent a null-pointer dereference when receiving a data cell
  5033. for a nonexistent stream when the circuit in question has an
  5034. empty deliver window. We don't believe this is triggerable,
  5035. since we don't currently allow deliver windows to become empty,
  5036. but the logic is tricky enough that it's better to make the code
  5037. robust. Fixes bug 5541; bugfix on 0.0.2pre14.
  5038. - Fix a (harmless) integer overflow in cell statistics reported by
  5039. some fast relays. Fixes bug 5849; bugfix on
  5040. - Fix our implementation of crypto_random_hostname() so it can't
  5041. overflow on ridiculously large inputs. (No Tor version has ever
  5042. provided this kind of bad inputs, but let's be correct in depth.)
  5043. Fixes bug 4413; bugfix on Fix by Stephen Palmateer.
  5044. - Add a (probably redundant) memory clear between iterations of
  5045. the router status voting loop, to prevent future coding errors
  5046. where data might leak between iterations of the loop. Resolves
  5047. ticket 6514.
  5048. o Minor bugfixes (wrapper functions):
  5049. - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
  5050. utility function used in the control-port code). This shouldn't
  5051. ever happen unless Tor is completely out of memory, but if it did
  5052. happen and Tor somehow recovered from it, Tor could have sent a log
  5053. message to a control port in the middle of a reply to a controller
  5054. command. Fixes part of bug 3428; bugfix on
  5055. - Fix some (not actually triggerable) buffer size checks in usage of
  5056. tor_inet_ntop(). Fixes bug 4434; bugfix on Tor Patch
  5057. by Anders Sundman.
  5058. - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
  5059. bug 4515; bugfix on; fix by Anders Sundman.
  5060. - Enforce correct return behavior of tor_vsscanf() when the '%%'
  5061. pattern is used. Fixes bug 5558. Bugfix on
  5062. - Make our replacement implementation of strtok_r() compatible with
  5063. the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
  5064. bugfix on
  5065. - Find more places in the code that should have been testing for
  5066. invalid sockets using the SOCKET_OK macro. Required for a fix
  5067. for bug 4533. Bugfix on
  5068. o Minor bugfixes (code correctness):
  5069. - Check return value of fputs() when writing authority certificate
  5070. file. Fixes Coverity issue 709056; bugfix on
  5071. - When building Tor on Windows with -DUNICODE (not default), ensure
  5072. that error messages, filenames, and DNS server names are always
  5073. NUL-terminated when we convert them to a single-byte encoding.
  5074. Fixes bug 5909; bugfix on
  5075. - Fix a memory leak when trying to launch a DNS request when the
  5076. nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
  5078. - Correct file sizes when reading binary files on Cygwin, to avoid
  5079. a bug where Tor would fail to read its state file. Fixes bug 6844;
  5080. bugfix on
  5081. - Make sure to set *socket_error in all error cases in
  5082. connection_connect(), so it can't produce a warning about
  5083. errno being zero from errno_to_orconn_end_reason(). Bugfix on
  5084.; resolves ticket 6028.
  5085. - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
  5086. bug 4532; found by "troll_un".
  5087. o Minor bugfixes (clients):
  5088. - Allow one-hop directory-fetching circuits the full "circuit build
  5089. timeout" period, rather than just half of it, before failing them
  5090. and marking the relay down. This fix should help reduce cases where
  5091. clients declare relays (or worse, bridges) unreachable because
  5092. the TLS handshake takes a few seconds to complete. Fixes bug 6743;
  5093. bugfix on, where we changed the timeout from a static
  5094. 30 seconds.
  5095. - Ensure we don't cannibalize circuits that are longer than three hops
  5096. already, so we don't end up making circuits with 5 or more
  5097. hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
  5098. which introduced cannibalization.
  5099. o Minor bugfixes (relays):
  5100. - Don't publish a new relay descriptor when we reload our onion key,
  5101. unless the onion key has actually changed. Fixes bug 3263 and
  5102. resolves another cause of bug 1810. Bugfix on
  5103. - When relays refuse a "create" cell because their queue of pending
  5104. create cells is too big (typically because their cpu can't keep up
  5105. with the arrival rate), send back reason "resource limit" rather
  5106. than reason "internal", so network measurement scripts can get a
  5107. more accurate picture. Bugfix on; fixes bug 7037.
  5108. - Exit nodes don't need to fetch certificates for authorities that
  5109. they don't recognize; only directory authorities, bridges,
  5110. and caches need to do that. Fixes part of bug 2297; bugfix on
  5112. o Minor bugfixes (directory authority / mirrors):
  5113. - Avoid O(n^2) performance characteristics when parsing a large
  5114. extrainfo cache. Fixes bug 5828; bugfix on
  5115. - Authorities no longer include any router in their microdescriptor
  5116. consensuses for which they couldn't generate or agree on a
  5117. microdescriptor. Fixes the second piece of bug 6404; fix on
  5119. - When checking for requested signatures on the latest consensus
  5120. before serving it to a client, make sure to check the right
  5121. consensus flavor. Bugfix on
  5122. - Fix an edge case where TestingTorNetwork is set but the authorities
  5123. and relays all have an uptime of zero, so the private Tor network
  5124. could briefly lack support for hidden services. Fixes bug 3886;
  5125. bugfix on
  5126. - Directory caches no longer refuse to clean out descriptors because
  5127. of missing v2 networkstatus documents, unless they're configured
  5128. to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
  5129. Patch by Daniel Bryg.
  5130. - Don't serve or accept v2 hidden service descriptors over a relay's
  5131. DirPort. It's never correct to do so, and disabling it might
  5132. make it more annoying to exploit any bugs that turn up in the
  5133. descriptor-parsing code. Fixes bug 7149.
  5134. o Minor bugfixes (hidden services, client-side):
  5135. - Assert that hidden-service-related operations are not performed
  5136. using single-hop circuits. Previously, Tor would assert that
  5137. client-side streams are not attached to single-hop circuits,
  5138. but not that other sensitive operations on the client and service
  5139. side are not performed using single-hop circuits. Fixes bug 3332;
  5140. bugfix on 0.0.6.
  5141. - Avoid undefined behavior when parsing the list of supported
  5142. rendezvous/introduction protocols in a hidden service descriptor.
  5143. Previously, Tor would have confused (as-yet-unused) protocol version
  5144. numbers greater than 32 with lower ones on many platforms. Fixes
  5145. bug 6827; bugfix on Found by George Kadianakis.
  5146. - Don't close hidden service client circuits which have almost
  5147. finished connecting to their destination when they reach
  5148. the normal circuit-build timeout. Previously, we would close
  5149. introduction circuits which are waiting for an acknowledgement
  5150. from the introduction point, and rendezvous circuits which have
  5151. been specified in an INTRODUCE1 cell sent to a hidden service,
  5152. after the normal CBT. Now, we mark them as 'timed out', and launch
  5153. another rendezvous attempt in parallel. This behavior change can
  5154. be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
  5155. option. Fixes part of bug 1297; bugfix on
  5156. o Minor bugfixes (hidden services, service-side):
  5157. - Don't close hidden-service-side rendezvous circuits when they
  5158. reach the normal circuit-build timeout. This behavior change can
  5159. be disabled using the new
  5160. CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
  5161. remaining part of bug 1297; bugfix on
  5162. - Don't launch more than 10 service-side introduction-point circuits
  5163. for a hidden service in five minutes. Previously, we would consider
  5164. launching more introduction-point circuits if at least one second
  5165. had passed without any introduction-point circuits failing. Fixes
  5166. bug 4607; bugfix on 0.0.7pre1.
  5167. o Minor bugfixes (config option behavior):
  5168. - If the user tries to set MyFamily on a bridge, refuse to
  5169. do so, and warn about the security implications. Fixes bug 4657;
  5170. bugfix on
  5171. - The "--quiet" and "--hush" options now apply not only to Tor's
  5172. behavior before logs are configured, but also to Tor's behavior in
  5173. the absense of configured logs. Fixes bug 3550; bugfix on
  5175. - Change the AllowDotExit rules so they should actually work.
  5176. We now enforce AllowDotExit only immediately after receiving an
  5177. address via SOCKS or DNSPort: other sources are free to provide
  5178. .exit addresses after the resolution occurs. Fixes bug 3940;
  5179. bugfix on
  5180. - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
  5181. don't depend on the consensus parameters or compute adaptive
  5182. timeouts when it is disabled. Fixes bug 5049; bugfix on
  5184. - After we pick a directory mirror, we would refuse to use it if
  5185. it's in our ExcludeExitNodes list, resulting in mysterious failures
  5186. to bootstrap for people who just wanted to avoid exiting from
  5187. certain locations. Fixes bug 5623; bugfix on
  5188. - When told to add a bridge with the same digest as a preexisting
  5189. bridge but a different addr:port, change the addr:port as
  5190. requested. Previously we would not notice the change. Fixes half
  5191. of bug 5603; fix on
  5192. o Minor bugfixes (controller):
  5193. - Allow manual 'authenticate' commands to the controller interface
  5194. from netcat (nc) as well as telnet. We were rejecting them because
  5195. they didn't come with the expected whitespace at the end of the
  5196. command. Bugfix on; fixes bug 2893.
  5197. - Report a real bootstrap problem to the controller on router
  5198. identity mismatch. Previously we just said "foo", which probably
  5199. made a lot of sense at the time. Fixes bug 4169; bugfix on
  5201. - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
  5202. option is set to 0 (which Vidalia version 0.2.16 now does when
  5203. a SAVECONF attempt fails), perform other actions that SIGHUP
  5204. usually causes (like reopening the logs). Fixes bug 5095; bugfix
  5205. on
  5206. - Correctly handle checking the permissions on the parent
  5207. directory of a control socket in the root directory. Bug found
  5208. by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
  5210. - End AUTHCHALLENGE error messages (in the control protocol) with
  5211. a CRLF. Fixes bug 5760; bugfix on
  5212. o Minor bugfixes (network reading/writing):
  5213. - Disable writing on marked-for-close connections when they are
  5214. blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
  5215. bug 5263; bugfix on 0.0.2pre13, where we first added a special
  5216. case for flushing marked connections.
  5217. - Make sure that there are no unhandled pending TLS errors before
  5218. reading from a TLS stream. We had checks in, but
  5219. lost them in when we refactored read_to_buf_tls().
  5220. Bugfix on; fixes bug 4528.
  5221. - Detect SSL handshake even when the initial attempt to write the
  5222. server hello fails. Fixes bug 4592; bugfix on
  5223. - If the client fails to set a reasonable set of ciphersuites
  5224. during its v2 handshake renegotiation, allow the renegotiation to
  5225. continue nevertheless (i.e. send all the required certificates).
  5226. Fixes bug 4591; bugfix on
  5227. o Minor bugfixes (other):
  5228. - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
  5229. resource exhaustion, so that clients can adjust their load to
  5230. try other exits. Fixes bug 4710; bugfix on, which
  5232. - Don't check for whether the address we're using for outbound
  5233. connections has changed until after the outbound connection has
  5234. completed. On Windows, getsockname() doesn't succeed until the
  5235. connection is finished. Fixes bug 5374; bugfix on
  5236. - Don't hold a Windows file handle open for every file mapping;
  5237. the file mapping handle is sufficient. Fixes bug 5951; bugfix on
  5239. - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
  5240. bugfix on
  5241. - If we fail to write a microdescriptor to the disk cache, do not
  5242. continue replacing the old microdescriptor file. Fixes bug 2954;
  5243. bugfix on
  5244. o Minor bugfixes (log messages, path selection):
  5245. - Downgrade "set buildtimeout to low value" messages to "info"
  5246. severity; they were never an actual problem, there was never
  5247. anything reasonable to do about them, and they tended to spam logs
  5248. from time to time. Fixes bug 6251; bugfix on
  5249. - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
  5250. more information to it, so that we can track it down in case it
  5251. returns again. Mitigates bug 5235.
  5252. - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
  5253. options_validate(); warn if LearnCircuitBuildTimeout is disabled and
  5254. CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
  5255. - Issue a log message if a guard completes less than 40% of your
  5256. circuits. Threshold is configurable by torrc option
  5257. PathBiasNoticeRate and consensus parameter pb_noticepct. There is
  5258. additional, off-by-default code to disable guards which fail too
  5259. many circuits. Addresses ticket 5458.
  5260. o Minor bugfixes (log messages, client):
  5261. - Downgrade "Got a certificate, but we already have it" log messages
  5262. from warning to info, except when we're a dirauth. Fixes bug 5238;
  5263. bugfix on
  5264. - Fix the log message describing how we work around discovering
  5265. that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
  5266. 4837; bugfix on
  5267. - When logging about a disallowed .exit name, do not also call it
  5268. an "invalid onion address". Fixes bug 3325; bugfix on
  5269. - Fix a log message suggesting that people contact a non-existent
  5270. email address. Fixes bug 3448.
  5271. - Rephrase the log message emitted if the TestSocks check is
  5272. successful. Patch from Fabian Keil; fixes bug 4094.
  5273. - Log (at debug level) whenever a circuit's purpose is changed.
  5274. - Log SSL state transitions at log level DEBUG, log domain
  5275. HANDSHAKE. This can be useful for debugging censorship events.
  5276. Implements ticket 3264.
  5277. - We now log which torrc file we're using on startup. Implements
  5278. ticket 2444.
  5279. - Rate-limit log messages when asked to connect anonymously to
  5280. a private address. When these hit, they tended to hit fast and
  5281. often. Also, don't bother trying to connect to addresses that we
  5282. are sure will resolve to getting in a directory
  5283. reply makes us think we have been lied to, even when the address the
  5284. client tried to connect to was "localhost." Resolves ticket 2822.
  5285. o Minor bugfixes (log messages, non-client):
  5286. - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
  5287. Fixes bug 5932; bugfix on
  5288. - Don't log that we have "decided to publish new relay descriptor"
  5289. unless we are actually publishing a descriptor. Fixes bug 3942;
  5290. bugfix on
  5291. - Log which authority we're missing votes from when we go to fetch
  5292. them from the other auths.
  5293. - Replace "Sending publish request" log messages with "Launching
  5294. upload", so that they no longer confusingly imply that we're
  5295. sending something to a directory we might not even be connected
  5296. to yet. Fixes bug 3311; bugfix on
  5297. - Warn when Tor is configured to use accounting in a way that can
  5298. link a hidden service to some other hidden service or public
  5299. address. Resolves ticket 6490.
  5300. - Fix a minor formatting issue in one of tor-gencert's error messages.
  5301. Fixes bug 4574.
  5302. o Testing:
  5303. - Update to the latest version of the tinytest unit testing framework.
  5304. This includes a couple of bugfixes that can be relevant for
  5305. running forked unit tests on Windows, and removes all reserved
  5306. identifiers.
  5307. - Avoid a false positive in the util/threads unit test by increasing
  5308. the maximum timeout time. Fixes bug 6227; bugfix on
  5309. - Make it possible to set the TestingTorNetwork configuration
  5310. option using AlternateDirAuthority and AlternateBridgeAuthority
  5311. as an alternative to setting DirServer. Addresses ticket 6377.
  5312. - Add a unit test for the environment_variable_names_equal() function.
  5313. - A wide variety of new unit tests by Esteban Manchado Velázquez.
  5314. - Numerous new unit tests for functions in util.c and address.c by
  5315. Anders Sundman.
  5316. - The long-disabled benchmark tests are now split into their own
  5317. ./src/test/bench binary.
  5318. - The benchmark tests can now use more accurate timers than
  5319. gettimeofday() when such timers are available.
  5320. - Use tt_assert(), not tor_assert(), for checking for test failures.
  5321. This makes the unit tests more able to go on in the event that
  5322. one of them fails.
  5323. o Build improvements:
  5324. - Use the dead_strip option when building Tor on OS X. This reduces
  5325. binary size by almost 19% when linking openssl and libevent
  5326. statically, which we do for Tor Browser Bundle.
  5327. - Provide a better error message about possible OSX Asciidoc failure
  5328. reasons. Fixes bug 6436.
  5329. - Detect attempts to build Tor on (as yet hypothetical) versions
  5330. of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
  5331. fix for bug 4533. Bugfix on
  5332. - On Windows, we now define the _WIN32_WINNT macros only if they
  5333. are not already defined. This lets the person building Tor decide,
  5334. if they want, to require a later version of Windows.
  5335. - Our script now uses autoreconf to launch autoconf,
  5336. automake, and so on. This is more robust against some of the failure
  5337. modes associated with running the autotools pieces on their own.
  5338. - Running "make version" now displays the version of Tor that
  5339. we're about to build. Idea from katmagic; resolves issue 4400.
  5340. - Make 'tor --digests' list hashes of all Tor source files. Bugfix
  5341. on; fixes bug 3427.
  5342. - New --enable-static-tor configure option for building Tor as
  5343. statically as possible. Idea, general hackery and thoughts from
  5344. Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
  5345. 2702.
  5346. - Limited, experimental support for building with nmake and MSVC.
  5347. o Build requirements:
  5348. - Building Tor with bufferevent support now requires Libevent
  5349. 2.0.13-stable or later. Previous versions of Libevent had bugs in
  5350. SSL-related bufferevents and related issues that would make Tor
  5351. work badly with bufferevents. Requiring 2.0.13-stable also allows
  5352. Tor with bufferevents to take advantage of Libevent APIs
  5353. introduced after 2.0.8-rc.
  5354. - Our build system requires automake 1.6 or later to create the
  5355. files. Previously, you could have used 1.4.
  5356. This only affects developers and people building Tor from git;
  5357. people who build Tor from the source distribution without changing
  5358. the files should be fine.
  5359. - Detect when we try to build on a platform that doesn't define
  5360. AF_UNSPEC to 0. We don't work there, so refuse to compile.
  5361. o Build fixes (compile/link):
  5362. - Format more doubles with %f, not %lf. Patch from grarpamp to make
  5363. Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
  5364. Tor
  5365. - When building with --enable-static-tor on OpenBSD, do not
  5366. erroneously attempt to link -lrt. Fixes bug 5103.
  5367. - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
  5368. that IPv6 stuff will compile on MSVC, and compilation issues
  5369. will be easier to track down. Fixes bug 5861.
  5370. - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
  5371. Fixes bug 6379. Bugfix on
  5372. - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
  5373. Fixes bug 6097; bugfix on
  5374. o Build fixes (other):
  5375. - Use the _WIN32 macro throughout our code to detect Windows.
  5376. (Previously we had used the obsolete 'WIN32' and the idiosyncratic
  5377. 'MS_WINDOWS'.)
  5378. - Properly handle the case where the build-tree is not the same
  5379. as the source tree when generating src/common/common_sha1.i,
  5380. src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
  5381. bugfix on
  5382. - During configure, search for library containing cos function as
  5383. libm lives in libcore on some platforms (BeOS/Haiku). Linking
  5384. against libm was hard-coded before. Fixes the first part of bug
  5385. 4727; bugfix on Patch and analysis by Martin Hebnes
  5386. Pedersen.
  5387. - Prevent a false positive from the check-spaces script, by disabling
  5388. the "whitespace between function name and (" check for functions
  5389. named 'op()'.
  5390. o Packaging (RPM) changes:
  5391. - Update our default RPM spec files to work with mock and rpmbuild
  5392. on RHEL/Fedora. They have an updated set of dependencies and
  5393. conflicts, a fix for an ancient typo when creating the "_tor"
  5394. user, and better instructions. Thanks to Ondrej Mikle for the
  5395. patch series. Fixes bug 6043.
  5396. - On OpenSUSE, create the /var/run/tor directory on startup if it
  5397. is not already created. Patch from Andreas Stieger. Fixes bug 2573.
  5398. o Code refactoring (safety):
  5399. - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
  5400. 10 lines. Also, don't nest them. Doing so in the past has
  5401. led to hard-to-debug code. The new style is to use the
  5402. SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
  5403. - Use macros to indicate OpenSSL versions, so we don't need to worry
  5404. about accidental hexadecimal bit shifts.
  5405. - Use tor_sscanf() in place of scanf() in more places through the
  5406. code. This makes us a little more locale-independent, and
  5407. should help shut up code-analysis tools that can't tell
  5408. a safe sscanf string from a dangerous one.
  5409. - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
  5410. - Use the smartlist_add_asprintf() alias more consistently.
  5411. o Code refactoring (consolidate):
  5412. - A major revision to our internal node-selecting and listing logic.
  5413. Tor already had at least two major ways to look at the question of
  5414. "which Tor servers do we know about": a list of router descriptors,
  5415. and a list of entries in the current consensus. With
  5416. microdescriptors, we're adding a third. Having so many systems
  5417. without an abstraction layer over them was hurting the codebase.
  5418. Now, we have a new "node_t" abstraction that presents a consistent
  5419. interface to a client's view of a Tor node, and holds (nearly) all
  5420. of the mutable state formerly in routerinfo_t and routerstatus_t.
  5421. - Move tor_gettimeofday_cached() into compat_libevent.c, and use
  5422. Libevent's notion of cached time when possible.
  5423. - Remove duplicate code for invoking getrlimit() from control.c.
  5424. - Use OpenSSL's built-in SSL_state_string_long() instead of our
  5425. own homebrewed ssl_state_to_string() replacement. Patch from
  5426. Emile Snyder. Fixes bug 4653.
  5427. - Change the symmetric cipher interface so that creating and
  5428. initializing a stream cipher are no longer separate functions.
  5429. o Code refactoring (separate):
  5430. - Make a new "entry connection" struct as an internal subtype of "edge
  5431. connection", to simplify the code and make exit connections smaller.
  5432. - Split connection_about_to_close() into separate functions for each
  5433. connection type.
  5434. - Rewrite the listener-selection logic so that parsing which ports
  5435. we want to listen on is now separate from binding to the ports
  5436. we want.
  5437. o Code refactoring (name changes):
  5438. - Rename a handful of old identifiers, mostly related to crypto
  5439. structures and crypto functions. By convention, our "create an
  5440. object" functions are called "type_new()", our "free an object"
  5441. functions are called "type_free()", and our types indicate that
  5442. they are types only with a final "_t". But a handful of older
  5443. types and functions broke these rules, with function names like
  5444. "type_create" or "subsystem_op_type", or with type names like
  5445. type_env_t.
  5446. - Rename Tor functions that turn strings into addresses, so that
  5447. "parse" indicates that no hostname resolution occurs, and
  5448. "lookup" indicates that hostname resolution may occur. This
  5449. should help prevent mistakes in the future. Fixes bug 3512.
  5450. - Use the name "CERTS" consistently to refer to the new cell type;
  5451. we were calling it CERT in some places and CERTS in others.
  5452. - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
  5453. invalid value, rather than just -1.
  5454. - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
  5455. can pick them up when the tests aren't disabled. Bugfix on
  5456. which introduced tinytest.
  5457. o Code refactoring (other):
  5458. - Defensively refactor rend_mid_rendezvous() so that protocol
  5459. violations and length checks happen in the beginning. Fixes
  5460. bug 5645.
  5461. - Remove the pure attribute from all functions that used it
  5462. previously. In many cases we assigned it incorrectly, because the
  5463. functions might assert or call impure functions, and we don't have
  5464. evidence that keeping the pure attribute is worthwhile. Implements
  5465. changes suggested in ticket 4421.
  5466. - Move the replay-detection cache for the RSA-encrypted parts of
  5467. INTRODUCE2 cells to the introduction point data structures.
  5468. Previously, we would use one replay-detection cache per hidden
  5469. service. Required by fix for bug 3460.
  5470. - The helper programs tor-gencert, tor-resolve, and tor-checkkey
  5471. no longer link against Libevent: they never used it, but
  5472. our library structure used to force them to link it.
  5473. o Removed features and files:
  5474. - Remove all internal support for unpadded RSA. We never used it, and
  5475. it would be a bad idea to start.
  5476. - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
  5477. supported).
  5478. - Remove some redundant #include directives throughout the code.
  5479. Patch from Andrea Gelmini.
  5480. - Remove some old code to remember statistics about which descriptors
  5481. we've served as a directory mirror. The feature wasn't used and
  5482. is outdated now that microdescriptors are around.
  5483. - Remove some old code to work around even older versions of Tor that
  5484. used forked processes to handle DNS requests. Such versions of Tor
  5485. are no longer in use as relays.
  5486. - The "torify" script no longer supports the "tsocks" socksifier
  5487. tool, since tsocks doesn't support DNS and UDP right for Tor.
  5488. Everyone should be using torsocks instead. Fixes bugs 3530 and
  5489. 5180. Based on a patch by "ugh".
  5490. - Remove the torrc.bridge file: we don't use it for anything, and
  5491. it had become badly desynchronized from torrc.sample. Resolves
  5492. bug 5622.
  5493. o Documentation:
  5494. - Begin a doc/state-contents.txt file to explain the contents of
  5495. the Tor state file. Fixes bug 2987.
  5496. - Clarify the documentation for the Alternate*Authority options.
  5497. Fixes bug 6387.
  5498. - Document the --defaults-torrc option, and the new semantics for
  5499. overriding, extending, and clearing lists of options. Closes
  5500. bug 4748.
  5501. - Add missing man page documentation for consensus and microdesc
  5502. files. Resolves ticket 6732.
  5503. - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
  5504. o Documentation fixes:
  5505. - Improve the manual's documentation for the NT Service command-line
  5506. options. Addresses ticket 3964.
  5507. - Clarify SessionGroup documentation slightly; resolves ticket 5437.
  5508. - Document the changes to the ORPort and DirPort options, and the
  5509. fact that {OR/Dir}ListenAddress is now unnecessary (and
  5510. therefore deprecated). Resolves ticket 5597.
  5511. - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
  5512. - Clarify that hidden services are TCP only. Fixes bug 6024.
  5513. Changes in version - 2012-09-11
  5514. Tor fixes two more opportunities for remotely triggerable
  5515. assertions.
  5516. o Security fixes:
  5517. - Fix an assertion failure in tor_timegm() that could be triggered
  5518. by a badly formatted directory object. Bug found by fuzzing with
  5519. Radamsa. Fixes bug 6811; bugfix on
  5520. - Do not crash when comparing an address with port value 0 to an
  5521. address policy. This bug could have been used to cause a remote
  5522. assertion failure by or against directory authorities, or to
  5523. allow some applications to crash clients. Fixes bug 6690; bugfix
  5524. on
  5525. Changes in version - 2012-08-12
  5526. Tor fixes a remotely triggerable crash bug, and fixes a timing
  5527. attack that could in theory leak path information.
  5528. o Security fixes:
  5529. - Avoid an uninitialized memory read when reading a vote or consensus
  5530. document that has an unrecognized flavor name. This read could
  5531. lead to a remote crash bug. Fixes bug 6530; bugfix on
  5532. - Try to leak less information about what relays a client is
  5533. choosing to a side-channel attacker. Previously, a Tor client would
  5534. stop iterating through the list of available relays as soon as it
  5535. had chosen one, thus finishing a little earlier when it picked
  5536. a router earlier in the list. If an attacker can recover this
  5537. timing information (nontrivial but not proven to be impossible),
  5538. they could learn some coarse-grained information about which relays
  5539. a client was picking (middle nodes in particular are likelier to
  5540. be affected than exits). The timing attack might be mitigated by
  5541. other factors (see bug 6537 for some discussion), but it's best
  5542. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  5543. Changes in version - 2012-06-06
  5544. Tor introduces a workaround for a critical renegotiation
  5545. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  5546. currently).
  5547. o Major bugfixes:
  5548. - Work around a bug in OpenSSL that broke renegotiation with TLS
  5549. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  5550. the v2 Tor connection protocol when both sides were using OpenSSL
  5551. 1.0.1 would fail. Resolves ticket 6033.
  5552. - When waiting for a client to renegotiate, don't allow it to add
  5553. any bytes to the input buffer. This fixes a potential DoS issue.
  5554. Fixes bugs 5934 and 6007; bugfix on
  5555. - Fix an edge case where if we fetch or publish a hidden service
  5556. descriptor, we might build a 4-hop circuit and then use that circuit
  5557. for exiting afterwards -- even if the new last hop doesn't obey our
  5558. ExitNodes config option. Fixes bug 5283; bugfix on
  5559. o Minor bugfixes:
  5560. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  5561. Fixes bug 5969. Bugfix on
  5562. o Minor features:
  5563. - Tell GCC and Clang to check for any errors in format strings passed
  5564. to the tor_v*(print|scan)f functions.
  5565. Changes in version - 2012-05-24
  5566. Tor updates the addresses for two of the eight directory
  5567. authorities, fixes some potential anonymity and security issues,
  5568. and fixes several crash bugs.
  5569. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
  5570. known flaws, and nobody should be using them. You should upgrade. If
  5571. you're using a Linux or BSD and its packages are obsolete, stop using
  5572. those packages and upgrade anyway.
  5573. o Directory authority changes:
  5574. - Change IP address for maatuska (v3 directory authority).
  5575. - Change IP address for ides (v3 directory authority), and rename
  5576. it to turtles.
  5577. o Security fixes:
  5578. - When building or running with any version of OpenSSL earlier
  5579. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  5580. versions have a bug (CVE-2011-4576) in which their block cipher
  5581. padding includes uninitialized data, potentially leaking sensitive
  5582. information to any peer with whom they make a SSLv3 connection. Tor
  5583. does not use SSL v3 by default, but a hostile client or server
  5584. could force an SSLv3 connection in order to gain information that
  5585. they shouldn't have been able to get. The best solution here is to
  5586. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  5587. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  5588. to make sure that the bug can't happen.
  5589. - Never use a bridge or a controller-supplied node as an exit, even
  5590. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  5591. 5342. Bugfix on (for controller-purpose descriptors)
  5592. and (for bridge-purpose descriptors).
  5593. - Only build circuits if we have a sufficient threshold of the total
  5594. descriptors that are marked in the consensus with the "Exit"
  5595. flag. This mitigates an attack proposed by wanoskarnet, in which
  5596. all of a client's bridges collude to restrict the exit nodes that
  5597. the client knows about. Fixes bug 5343.
  5598. - Provide controllers with a safer way to implement the cookie
  5599. authentication mechanism. With the old method, if another locally
  5600. running program could convince a controller that it was the Tor
  5601. process, then that program could trick the controller into telling
  5602. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  5603. authentication method uses a challenge-response approach to prevent
  5604. this attack. Fixes bug 5185; implements proposal 193.
  5605. o Major bugfixes:
  5606. - Avoid logging uninitialized data when unable to decode a hidden
  5607. service descriptor cookie. Fixes bug 5647; bugfix on
  5608. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  5609. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  5611. - Fix builds when the path to sed, openssl, or sha1sum contains
  5612. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  5613. on
  5614. - Correct our replacements for the timeradd() and timersub() functions
  5615. on platforms that lack them (for example, Windows). The timersub()
  5616. function is used when expiring circuits, while timeradd() is
  5617. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  5618. bugfix on
  5619. - Fix the SOCKET_OK test that we use to tell when socket
  5620. creation fails so that it works on Win64. Fixes part of bug 4533;
  5621. bugfix on Bug found by wanoskarnet.
  5622. o Minor bugfixes:
  5623. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  5624. Fixes bug 5346; bugfix on 0.0.8pre3.
  5625. - Make our number-parsing functions always treat too-large values
  5626. as an error, even when those values exceed the width of the
  5627. underlying type. Previously, if the caller provided these
  5628. functions with minima or maxima set to the extreme values of the
  5629. underlying integer type, these functions would return those
  5630. values on overflow rather than treating overflow as an error.
  5631. Fixes part of bug 5786; bugfix on 0.0.9.
  5632. - Older Linux kernels erroneously respond to strange nmap behavior
  5633. by having accept() return successfully with a zero-length
  5634. socket. When this happens, just close the connection. Previously,
  5635. we would try harder to learn the remote address: but there was
  5636. no such remote address to learn, and our method for trying to
  5637. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  5638. on Reported and diagnosed by "r1eo".
  5639. - Correct parsing of certain date types in parse_http_time().
  5640. Without this patch, If-Modified-Since would behave
  5641. incorrectly. Fixes bug 5346; bugfix on Patch from
  5642. Esteban Manchado Velázques.
  5643. - Change the BridgePassword feature (part of the "bridge community"
  5644. design, which is not yet implemented) to use a time-independent
  5645. comparison. The old behavior might have allowed an adversary
  5646. to use timing to guess the BridgePassword value. Fixes bug 5543;
  5647. bugfix on
  5648. - Detect and reject certain misformed escape sequences in
  5649. configuration values. Previously, these values would cause us
  5650. to crash if received in a torrc file or over an authenticated
  5651. control port. Bug found by Esteban Manchado Velázquez, and
  5652. independently by Robert Connolly from Matta Consulting who further
  5653. noted that it allows a post-authentication heap overflow. Patch
  5654. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  5655. bugfix on
  5656. - Fix a compile warning when using the --enable-openbsd-malloc
  5657. configure option. Fixes bug 5340; bugfix on
  5658. - During configure, detect when we're building with clang version
  5659. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  5660. CFLAGS. clang doesn't support them yet.
  5661. - When sending an HTTP/1.1 proxy request, include a Host header.
  5662. Fixes bug 5593; bugfix on
  5663. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
  5664. command. Found by mikeyc. Fixes bug 5796; bugfix on
  5665. - If we hit the error case where routerlist_insert() replaces an
  5666. existing (old) server descriptor, make sure to remove that
  5667. server descriptor from the old_routers list. Fix related to bug
  5668. 1776. Bugfix on
  5669. o Minor bugfixes (documentation and log messages):
  5670. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  5671. Fixes bug 4856; bugfix on Tor 0.0.6.
  5672. - Update "ClientOnly" man page entry to explain that there isn't
  5673. really any point to messing with it. Resolves ticket 5005.
  5674. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  5675. directory authority option (introduced in Tor
  5676. - Downgrade the "We're missing a certificate" message from notice
  5677. to info: people kept mistaking it for a real problem, whereas it
  5678. is seldom the problem even when we are failing to bootstrap. Fixes
  5679. bug 5067; bugfix on
  5680. - Correctly spell "connect" in a log message on failure to create a
  5681. controlsocket. Fixes bug 4803; bugfix on
  5682. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  5683. circuits. Fixes issue 5259.
  5684. o Minor features:
  5685. - Directory authorities now reject versions of Tor older than
  5686., and Tor versions between and
  5687. inclusive. These versions accounted for only a small fraction of
  5688. the Tor network, and have numerous known security issues. Resolves
  5689. issue 4788.
  5690. - Update to the May 1 2012 Maxmind GeoLite Country database.
  5691. - Feature removal:
  5692. - When sending or relaying a RELAY_EARLY cell, we used to convert
  5693. it to a RELAY cell if the connection was using the v1 link
  5694. protocol. This was a workaround for older versions of Tor, which
  5695. didn't handle RELAY_EARLY cells properly. Now that all supported
  5696. versions can handle RELAY_EARLY cells, and now that we're enforcing
  5697. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  5698. remove this workaround. Addresses bug 4786.
  5699. Changes in version - 2011-12-16
  5700. Tor fixes a critical heap-overflow security issue in Tor's
  5701. buffers code. Absolutely everybody should upgrade.
  5702. The bug relied on an incorrect calculation when making data continuous
  5703. in one of our IO buffers, if the first chunk of the buffer was
  5704. misaligned by just the wrong amount. The miscalculation would allow an
  5705. attacker to overflow a piece of heap-allocated memory. To mount this
  5706. attack, the attacker would need to either open a SOCKS connection to
  5707. Tor's SocksPort (usually restricted to localhost), or target a Tor
  5708. instance configured to make its connections through a SOCKS proxy
  5709. (which Tor does not do by default).
  5710. Good security practice requires that all heap-overflow bugs should be
  5711. presumed to be exploitable until proven otherwise, so we are treating
  5712. this as a potential code execution attack. Please upgrade immediately!
  5713. This bug does not affect bufferevents-based builds of Tor. Special
  5714. thanks to "Vektor" for reporting this issue to us!
  5715. Tor also fixes several bugs in previous versions, including
  5716. crash bugs for unusual configurations, and a long-term bug that
  5717. would prevent Tor from starting on Windows machines with draconian
  5718. AV software.
  5719. With this release, we remind everyone that 0.2.0.x has reached its
  5720. formal end-of-life. Those Tor versions have many known flaws, and
  5721. nobody should be using them. You should upgrade -- ideally to the
  5722. 0.2.2.x series. If you're using a Linux or BSD and its packages are
  5723. obsolete, stop using those packages and upgrade anyway.
  5724. The Tor 0.2.1.x series is also approaching its end-of-life: it will no
  5725. longer receive support after some time in early 2012.
  5726. o Major bugfixes:
  5727. - Fix a heap overflow bug that could occur when trying to pull
  5728. data into the first chunk of a buffer, when that chunk had
  5729. already had some data drained from it. Fixes CVE-2011-2778;
  5730. bugfix on Reported by "Vektor".
  5731. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  5732. that it doesn't attempt to allocate a socketpair. This could cause
  5733. some problems on Windows systems with overzealous firewalls. Fix for
  5734. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  5735. 2.0.15-stable.
  5736. - If we mark an OR connection for close based on a cell we process,
  5737. don't process any further cells on it. We already avoid further
  5738. reads on marked-for-close connections, but now we also discard the
  5739. cells we'd already read. Fixes bug 4299; bugfix on,
  5740. which was the first version where we might mark a connection for
  5741. close based on processing a cell on it.
  5742. - Correctly sanity-check that we don't underflow on a memory
  5743. allocation (and then assert) for hidden service introduction
  5744. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  5745. bugfix on
  5746. - Fix a memory leak when we check whether a hidden service
  5747. descriptor has any usable introduction points left. Fixes bug
  5748. 4424. Bugfix on
  5749. - Don't crash when we're running as a relay and don't have a GeoIP
  5750. file. Bugfix on; fixes bug 4340. This backports a fix
  5751. we've had in the 0.2.3.x branch already.
  5752. - When running as a client, do not print a misleading (and plain
  5753. wrong) log message that we're collecting "directory request"
  5754. statistics: clients don't collect statistics. Also don't create a
  5755. useless (because empty) stats file in the stats/ directory. Fixes
  5756. bug 4353; bugfix on
  5757. o Minor bugfixes:
  5758. - Detect failure to initialize Libevent. This fix provides better
  5759. detection for future instances of bug 4457.
  5760. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  5761. function. This was eating up hideously large amounts of time on some
  5762. busy servers. Fixes bug 4518; bugfix on
  5763. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  5764. Fixes bug 4230; bugfix on Tor Based on a patch by
  5765. Mansour Moufid.
  5766. - Don't warn about unused log_mutex in log.c when building with
  5767. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  5768. which introduced --disable-threads.
  5769. - When configuring, starting, or stopping an NT service, stop
  5770. immediately after the service configuration attempt has succeeded
  5771. or failed. Fixes bug 3963; bugfix on
  5772. - When sending a NETINFO cell, include the original address
  5773. received for the other side, not its canonical address. Found
  5774. by "troll_un"; fixes bug 4349; bugfix on
  5775. - Fix a typo in a hibernation-related log message. Fixes bug 4331;
  5776. bugfix on; found by "tmpname0901".
  5777. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  5778. occurred when a client tried to fetch a descriptor for a bridge
  5779. in ExcludeNodes. Fixes bug 4383; bugfix on
  5780. - Backport fixes for a pair of compilation warnings on Windows.
  5781. Fixes bug 4521; bugfix on and on
  5782. - If we had ever tried to call tor_addr_to_str on an address of
  5783. unknown type, we would have done a strdup on an uninitialized
  5784. buffer. Now we won't. Fixes bug 4529; bugfix on
  5785. Reported by "troll_un".
  5786. - Correctly detect and handle transient lookup failures from
  5787. tor_addr_lookup. Fixes bug 4530; bugfix on
  5788. Reported by "troll_un".
  5789. - Fix null-pointer access that could occur if TLS allocation failed.
  5790. Fixes bug 4531; bugfix on Found by "troll_un".
  5791. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  5792. 4535; bugfix on Found by "troll_un".
  5793. o Minor features:
  5794. - Add two new config options for directory authorities:
  5795. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  5796. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  5797. that is always sufficient to satisfy the bandwidth requirement for
  5798. the Guard flag. Now it will be easier for researchers to simulate
  5799. Tor networks with different values. Resolves ticket 4484.
  5800. - When Tor ignores a hidden service specified in its configuration,
  5801. include the hidden service's directory in the warning message.
  5802. Previously, we would only tell the user that some hidden service
  5803. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  5804. - Update to the December 6 2011 Maxmind GeoLite Country database.
  5805. o Packaging changes:
  5806. - Make it easier to automate expert package builds on Windows,
  5807. by removing an absolute path from makensis.exe command.
  5808. Changes in version - 2011-12-16
  5809. Tor backports important security and privacy fixes for
  5810. oldstable. This release is intended only for package maintainers and
  5811. others who cannot use the 0.2.2 stable series. All others should be
  5812. using Tor 0.2.2.x or newer.
  5813. The Tor 0.2.1.x series will reach formal end-of-life some time in
  5814. early 2012; we will stop releasing patches for it then.
  5815. o Major bugfixes (also included in 0.2.2.x):
  5816. - Correctly sanity-check that we don't underflow on a memory
  5817. allocation (and then assert) for hidden service introduction
  5818. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  5819. bugfix on
  5820. - Fix a heap overflow bug that could occur when trying to pull
  5821. data into the first chunk of a buffer, when that chunk had
  5822. already had some data drained from it. Fixes CVE-2011-2778;
  5823. bugfix on Reported by "Vektor".
  5824. o Minor features:
  5825. - Update to the December 6 2011 Maxmind GeoLite Country database.
  5826. Changes in version - 2011-10-26
  5827. Tor fixes a critical anonymity vulnerability where an attacker
  5828. can deanonymize Tor users. Everybody should upgrade.
  5829. The attack relies on four components: 1) Clients reuse their TLS cert
  5830. when talking to different relays, so relays can recognize a user by
  5831. the identity key in her cert. 2) An attacker who knows the client's
  5832. identity key can probe each guard relay to see if that identity key
  5833. is connected to that guard relay right now. 3) A variety of active
  5834. attacks in the literature (starting from "Low-Cost Traffic Analysis
  5835. of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
  5836. discover the guard relays that a Tor user visiting the website is using.
  5837. 4) Clients typically pick three guards at random, so the set of guards
  5838. for a given user could well be a unique fingerprint for her. This
  5839. release fixes components #1 and #2, which is enough to block the attack;
  5840. the other two remain as open research problems. Special thanks to
  5841. "frosty_un" for reporting the issue to us!
  5842. Clients should upgrade so they are no longer recognizable by the TLS
  5843. certs they present. Relays should upgrade so they no longer allow a
  5844. remote attacker to probe them to test whether unpatched clients are
  5845. currently connected to them.
  5846. This release also fixes several vulnerabilities that allow an attacker
  5847. to enumerate bridge relays. Some bridge enumeration attacks still
  5848. remain; see for example proposal 188.
  5849. o Privacy/anonymity fixes (clients):
  5850. - Clients and bridges no longer send TLS certificate chains on
  5851. outgoing OR connections. Previously, each client or bridge would
  5852. use the same cert chain for all outgoing OR connections until
  5853. its IP address changes, which allowed any relay that the client
  5854. or bridge contacted to determine which entry guards it is using.
  5855. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  5856. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  5857. no longer considers that connection as suitable for satisfying a
  5858. circuit EXTEND request. Now relays can protect clients from the
  5859. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  5860. - Directory authorities no longer assign the Guard flag to relays
  5861. that haven't upgraded to the above "refuse EXTEND requests
  5862. to client connections" fix. Now directory authorities can
  5863. protect clients from the CVE-2011-2768 issue even if neither
  5864. the clients nor the relays have upgraded yet. There's a new
  5865. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  5866. to let us transition smoothly, else tomorrow there would be no
  5867. guard relays.
  5868. o Privacy/anonymity fixes (bridge enumeration):
  5869. - Bridge relays now do their directory fetches inside Tor TLS
  5870. connections, like all the other clients do, rather than connecting
  5871. directly to the DirPort like public relays do. Removes another
  5872. avenue for enumerating bridges. Fixes bug 4115; bugfix on
  5873. - Bridges relays now build circuits for themselves in a more similar
  5874. way to how clients build them. Removes another avenue for
  5875. enumerating bridges. Fixes bug 4124; bugfix on,
  5876. when bridges were introduced.
  5877. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  5878. that they initiated. Relays could distinguish incoming bridge
  5879. connections from client connections, creating another avenue for
  5880. enumerating bridges. Fixes CVE-2011-2769. Bugfix on
  5881. Found by "frosty_un".
  5882. o Major bugfixes:
  5883. - Fix a crash bug when changing node restrictions while a DNS lookup
  5884. is in-progress. Fixes bug 4259; bugfix on Bugfix
  5885. by "Tey'".
  5886. - Don't launch a useless circuit after failing to use one of a
  5887. hidden service's introduction points. Previously, we would
  5888. launch a new introduction circuit, but not set the hidden service
  5889. which that circuit was intended to connect to, so it would never
  5890. actually be used. A different piece of code would then create a
  5891. new introduction circuit correctly. Bug reported by katmagic and
  5892. found by Sebastian Hahn. Bugfix on; fixes bug 4212.
  5893. o Minor bugfixes:
  5894. - Change an integer overflow check in the OpenBSD_Malloc code so
  5895. that GCC is less likely to eliminate it as impossible. Patch
  5896. from Mansour Moufid. Fixes bug 4059.
  5897. - When a hidden service turns an extra service-side introduction
  5898. circuit into a general-purpose circuit, free the rend_data and
  5899. intro_key fields first, so we won't leak memory if the circuit
  5900. is cannibalized for use as another service-side introduction
  5901. circuit. Bugfix on; fixes bug 4251.
  5902. - Bridges now skip DNS self-tests, to act a little more stealthily.
  5903. Fixes bug 4201; bugfix on, which first introduced
  5904. bridges. Patch by "warms0x".
  5905. - Fix internal bug-checking logic that was supposed to catch
  5906. failures in digest generation so that it will fail more robustly
  5907. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  5908. Bugfix on; fixes Coverity CID 479.
  5909. - Report any failure in init_keys() calls launched because our
  5910. IP address has changed. Spotted by Coverity Scan. Bugfix on
  5911.; fixes CID 484.
  5912. o Minor bugfixes (log messages and documentation):
  5913. - Remove a confusing dollar sign from the example fingerprint in the
  5914. man page, and also make the example fingerprint a valid one. Fixes
  5915. bug 4309; bugfix on
  5916. - The next version of Windows will be called Windows 8, and it has
  5917. a major version of 6, minor version of 2. Correctly identify that
  5918. version instead of calling it "Very recent version". Resolves
  5919. ticket 4153; reported by funkstar.
  5920. - Downgrade log messages about circuit timeout calibration from
  5921. "notice" to "info": they don't require or suggest any human
  5922. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  5923. bugfix on
  5924. o Minor features:
  5925. - Turn on directory request statistics by default and include them in
  5926. extra-info descriptors. Don't break if we have no GeoIP database.
  5927. Backported from; implements ticket 3951.
  5928. - Update to the October 4 2011 Maxmind GeoLite Country database.
  5929. Changes in version - 2011-10-26
  5930. Tor backports important security and privacy fixes for
  5931. oldstable. This release is intended only for package maintainers and
  5932. others who cannot use the 0.2.2 stable series. All others should be
  5933. using Tor 0.2.2.x or newer.
  5934. o Security fixes (also included in 0.2.2.x):
  5935. - Replace all potentially sensitive memory comparison operations
  5936. with versions whose runtime does not depend on the data being
  5937. compared. This will help resist a class of attacks where an
  5938. adversary can use variations in timing information to learn
  5939. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  5940. implementation by Robert Ransom based partially on code by DJB.)
  5941. - Fix an assert in parsing router descriptors containing IPv6
  5942. addresses. This one took down the directory authorities when
  5943. somebody tried some experimental code. Bugfix on
  5944. o Privacy/anonymity fixes (also included in 0.2.2.x):
  5945. - Clients and bridges no longer send TLS certificate chains on
  5946. outgoing OR connections. Previously, each client or bridge would
  5947. use the same cert chain for all outgoing OR connections until
  5948. its IP address changes, which allowed any relay that the client
  5949. or bridge contacted to determine which entry guards it is using.
  5950. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  5951. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  5952. no longer considers that connection as suitable for satisfying a
  5953. circuit EXTEND request. Now relays can protect clients from the
  5954. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  5955. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  5956. that they initiated. Relays could distinguish incoming bridge
  5957. connections from client connections, creating another avenue for
  5958. enumerating bridges. Fixes CVE-2011-2769. Bugfix on
  5959. Found by "frosty_un".
  5960. - When receiving a hidden service descriptor, check that it is for
  5961. the hidden service we wanted. Previously, Tor would store any
  5962. hidden service descriptors that a directory gave it, whether it
  5963. wanted them or not. This wouldn't have let an attacker impersonate
  5964. a hidden service, but it did let directories pre-seed a client
  5965. with descriptors that it didn't want. Bugfix on 0.0.6.
  5966. - Avoid linkability based on cached hidden service descriptors: forget
  5967. all hidden service descriptors cached as a client when processing a
  5968. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  5969. - Make the bridge directory authority refuse to answer directory
  5970. requests for "all" descriptors. It used to include bridge
  5971. descriptors in its answer, which was a major information leak.
  5972. Found by "piebeer". Bugfix on
  5973. - Don't attach new streams to old rendezvous circuits after SIGNAL
  5974. NEWNYM. Previously, we would keep using an existing rendezvous
  5975. circuit if it remained open (i.e. if it were kept open by a
  5976. long-lived stream, or if a new stream were attached to it before
  5977. Tor could notice that it was old and no longer in use). Bugfix on
  5978.; fixes bug 3375.
  5979. o Minor bugfixes (also included in 0.2.2.x):
  5980. - When we restart our relay, we might get a successful connection
  5981. from the outside before we've started our reachability tests,
  5982. triggering a warning: "ORPort found reachable, but I have no
  5983. routerinfo yet. Failing to inform controller of success." This
  5984. bug was harmless unless Tor is running under a controller
  5985. like Vidalia, in which case the controller would never get a
  5986. REACHABILITY_SUCCEEDED status event. Bugfix on;
  5987. fixes bug 1172.
  5988. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  5989. enabled. Fixes bug 1526.
  5990. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  5991. anything since
  5992. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  5993. None of the cases where we did this before were wrong, but by making
  5994. this change we avoid warnings. Fixes bug 2475; bugfix on
  5995. - Fix a rare crash bug that could occur when a client was configured
  5996. with a large number of bridges. Fixes bug 2629; bugfix on
  5997. Bugfix by trac user "shitlei".
  5998. - Correct the warning displayed when a rendezvous descriptor exceeds
  5999. the maximum size. Fixes bug 2750; bugfix on Found by
  6000. John Brooks.
  6001. - Fix an uncommon assertion failure when running with DNSPort under
  6002. heavy load. Fixes bug 2933; bugfix on
  6003. - When warning about missing zlib development packages during compile,
  6004. give the correct package names. Bugfix on
  6005. - Require that introduction point keys and onion keys have public
  6006. exponent 65537. Bugfix on
  6007. - Do not crash when our configuration file becomes unreadable, for
  6008. example due to a permissions change, between when we start up
  6009. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  6010. on 0.0.9pre6.
  6011. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  6012. Fixes bug 3208.
  6013. - Always NUL-terminate the sun_path field of a sockaddr_un before
  6014. passing it to the kernel. (Not a security issue: kernels are
  6015. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  6016. CID #428. Bugfix on Tor
  6017. - Don't stack-allocate the list of supplementary GIDs when we're
  6018. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  6019. could take up to 256K, which is way too much stack. Found by
  6020. Coverity; CID #450. Bugfix on
  6021. o Minor bugfixes (only in 0.2.1.x):
  6022. - Resume using micro-version numbers in 0.2.1.x: our Debian packages
  6023. rely on them. Bugfix on
  6024. - Use git revisions instead of svn revisions when generating our
  6025. micro-version numbers. Bugfix on; fixes bug 2402.
  6026. o Minor features (also included in 0.2.2.x):
  6027. - Adjust the expiration time on our SSL session certificates to
  6028. better match SSL certs seen in the wild. Resolves ticket 4014.
  6029. - Allow nameservers with IPv6 address. Resolves bug 2574.
  6030. - Update to the October 4 2011 Maxmind GeoLite Country database.
  6031. Changes in version - 2011-09-13
  6032. Tor fixes several bugs, and includes a slight tweak to Tor's
  6033. TLS handshake that makes relays and bridges that run this new version
  6034. reachable from Iran again.
  6035. o Major bugfixes:
  6036. - Avoid an assertion failure when reloading a configuration with
  6037. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  6038. 3923; bugfix on
  6039. o Minor features (security):
  6040. - Check for replays of the public-key encrypted portion of an
  6041. INTRODUCE1 cell, in addition to the current check for replays of
  6042. the g^x value. This prevents a possible class of active attacks
  6043. by an attacker who controls both an introduction point and a
  6044. rendezvous point, and who uses the malleability of AES-CTR to
  6045. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  6046. that these attacks are infeasible (requiring the attacker to send
  6047. on the order of zettabytes of altered cells in a short interval),
  6048. but we'd rather block them off in case there are any classes of
  6049. this attack that we missed. Reported by Willem Pinckaers.
  6050. o Minor features:
  6051. - Adjust the expiration time on our SSL session certificates to
  6052. better match SSL certs seen in the wild. Resolves ticket 4014.
  6053. - Change the default required uptime for a relay to be accepted as
  6054. a HSDir (hidden service directory) from 24 hours to 25 hours.
  6055. Improves on; resolves ticket 2649.
  6056. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  6057. authorities to abstain from voting on assignment of the HSDir
  6058. consensus flag. Related to bug 2649.
  6059. - Update to the September 6 2011 Maxmind GeoLite Country database.
  6060. o Minor bugfixes (documentation and log messages):
  6061. - Correct the man page to explain that HashedControlPassword and
  6062. CookieAuthentication can both be set, in which case either method
  6063. is sufficient to authenticate to Tor. Bugfix on,
  6064. when we decided to allow these config options to both be set. Issue
  6065. raised by bug 3898.
  6066. - Demote the 'replay detected' log message emitted when a hidden
  6067. service receives the same Diffie-Hellman public key in two different
  6068. INTRODUCE2 cells to info level. A normal Tor client can cause that
  6069. log message during its normal operation. Bugfix on;
  6070. fixes part of bug 2442.
  6071. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  6072. level. There is nothing that a hidden service's operator can do
  6073. to fix its clients' clocks. Bugfix on; fixes part
  6074. of bug 2442.
  6075. - Clarify a log message specifying the characters permitted in
  6076. HiddenServiceAuthorizeClient client names. Previously, the log
  6077. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  6078. given the impression that every ASCII character between "+" and "_"
  6079. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on
  6080. o Build fixes:
  6081. - Provide a substitute implementation of lround() for MSVC, which
  6082. apparently lacks it. Patch from Gisle Vanem.
  6083. - Clean up some code issues that prevented Tor from building on older
  6084. BSDs. Fixes bug 3894; reported by "grarpamp".
  6085. - Search for a platform-specific version of "ar" when cross-compiling.
  6086. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  6087. Changes in version - 2011-08-27
  6088. The Tor 0.2.2 release series is dedicated to the memory of Andreas
  6089. Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
  6090. a founder of the PETS community, a leader in our field, a mentor,
  6091. and a friend. He left us with these words: "I had the possibility
  6092. to contribute to this world that is not as it should be. I hope I
  6093. could help in some areas to make the world a better place, and that
  6094. I could also encourage other people to be engaged in improving the
  6095. world. Please, stay engaged. This world needs you, your love, your
  6096. initiative -- now I cannot be part of that anymore."
  6097. Tor, the first stable release in the 0.2.2 branch, is finally
  6098. ready. More than two years in the making, this release features improved
  6099. client performance and hidden service reliability, better compatibility
  6100. for Android, correct behavior for bridges that listen on more than
  6101. one address, more extensible and flexible directory object handling,
  6102. better reporting of network statistics, improved code security, and
  6103. many many other features and bugfixes.
  6104. o Major features (client performance):
  6105. - When choosing which cells to relay first, relays now favor circuits
  6106. that have been quiet recently, to provide lower latency for
  6107. low-volume circuits. By default, relays enable or disable this
  6108. feature based on a setting in the consensus. They can override
  6109. this default by using the new "CircuitPriorityHalflife" config
  6110. option. Design and code by Ian Goldberg, Can Tang, and Chris
  6111. Alexander.
  6112. - Directory authorities now compute consensus weightings that instruct
  6113. clients how to weight relays flagged as Guard, Exit, Guard+Exit,
  6114. and no flag. Clients use these weightings to distribute network load
  6115. more evenly across these different relay types. The weightings are
  6116. in the consensus so we can change them globally in the future. Extra
  6117. thanks to "outofwords" for finding some nasty security bugs in
  6118. the first implementation of this feature.
  6119. o Major features (client performance, circuit build timeout):
  6120. - Tor now tracks how long it takes to build client-side circuits
  6121. over time, and adapts its timeout to local network performance.
  6122. Since a circuit that takes a long time to build will also provide
  6123. bad performance, we get significant latency improvements by
  6124. discarding the slowest 20% of circuits. Specifically, Tor creates
  6125. circuits more aggressively than usual until it has enough data
  6126. points for a good timeout estimate. Implements proposal 151.
  6127. - Circuit build timeout constants can be controlled by consensus
  6128. parameters. We set good defaults for these parameters based on
  6129. experimentation on broadband and simulated high-latency links.
  6130. - Circuit build time learning can be disabled via consensus parameter
  6131. or by the client via a LearnCircuitBuildTimeout config option. We
  6132. also automatically disable circuit build time calculation if either
  6133. AuthoritativeDirectory is set, or if we fail to write our state
  6134. file. Implements ticket 1296.
  6135. o Major features (relays use their capacity better):
  6136. - Set SO_REUSEADDR socket option on all sockets, not just
  6137. listeners. This should help busy exit nodes avoid running out of
  6138. useable ports just because all the ports have been used in the
  6139. near past. Resolves issue 2850.
  6140. - Relays now save observed peak bandwidth throughput rates to their
  6141. state file (along with total usage, which was already saved),
  6142. so that they can determine their correct estimated bandwidth on
  6143. restart. Resolves bug 1863, where Tor relays would reset their
  6144. estimated bandwidth to 0 after restarting.
  6145. - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
  6146. should give us approximately 40-50% more Guard-flagged nodes,
  6147. improving the anonymity the Tor network can provide and also
  6148. decreasing the dropoff in throughput that relays experience when
  6149. they first get the Guard flag.
  6150. - Directory authorities now take changes in router IP address and
  6151. ORPort into account when determining router stability. Previously,
  6152. if a router changed its IP or ORPort, the authorities would not
  6153. treat it as having any downtime for the purposes of stability
  6154. calculation, whereas clients would experience downtime since the
  6155. change would take a while to propagate to them. Resolves issue 1035.
  6156. - New AccelName and AccelDir options add support for dynamic OpenSSL
  6157. hardware crypto acceleration engines.
  6158. o Major features (relays control their load better):
  6159. - Exit relays now try harder to block exit attempts from unknown
  6160. relays, to make it harder for people to use them as one-hop proxies
  6161. a la tortunnel. Controlled by the refuseunknownexits consensus
  6162. parameter (currently enabled), or you can override it on your
  6163. relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
  6164. based on a variant of proposal 163.
  6165. - Add separate per-conn write limiting to go with the per-conn read
  6166. limiting. We added a global write limit in Tor,
  6167. but never per-conn write limits.
  6168. - New consensus params "bwconnrate" and "bwconnburst" to let us
  6169. rate-limit client connections as they enter the network. It's
  6170. controlled in the consensus so we can turn it on and off for
  6171. experiments. It's starting out off. Based on proposal 163.
  6172. o Major features (controllers):
  6173. - Export GeoIP information on bridge usage to controllers even if we
  6174. have not yet been running for 24 hours. Now Vidalia bridge operators
  6175. can get more accurate and immediate feedback about their
  6176. contributions to the network.
  6177. - Add an __OwningControllerProcess configuration option and a
  6178. TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
  6179. that when it exits, Tor will shut down. Implements feature 3049.
  6180. o Major features (directory authorities):
  6181. - Directory authorities now create, vote on, and serve multiple
  6182. parallel formats of directory data as part of their voting process.
  6183. Partially implements Proposal 162: "Publish the consensus in
  6184. multiple flavors".
  6185. - Directory authorities now agree on and publish small summaries
  6186. of router information that clients can use in place of regular
  6187. server descriptors. This transition will allow Tor 0.2.3 clients
  6188. to use far less bandwidth for downloading information about the
  6189. network. Begins the implementation of Proposal 158: "Clients
  6190. download consensus + microdescriptors".
  6191. - The directory voting system is now extensible to use multiple hash
  6192. algorithms for signatures and resource selection. Newer formats
  6193. are signed with SHA256, with a possibility for moving to a better
  6194. hash algorithm in the future.
  6195. - Directory authorities can now vote on arbitary integer values as
  6196. part of the consensus process. This is designed to help set
  6197. network-wide parameters. Implements proposal 167.
  6198. o Major features and bugfixes (node selection):
  6199. - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
  6200. ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
  6201. options. Previously, we had been ambiguous in describing what
  6202. counted as an "exit" node, and what operations exactly "StrictNodes
  6203. 0" would permit. This created confusion when people saw nodes built
  6204. through unexpected circuits, and made it hard to tell real bugs from
  6205. surprises. Now the intended behavior is:
  6206. . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
  6207. a node that delivers user traffic outside the Tor network.
  6208. . "Entry", in the context of EntryNodes, means a node used as the
  6209. first hop of a multihop circuit. It doesn't include direct
  6210. connections to directory servers.
  6211. . "ExcludeNodes" applies to all nodes.
  6212. . "StrictNodes" changes the behavior of ExcludeNodes only. When
  6213. StrictNodes is set, Tor should avoid all nodes listed in
  6214. ExcludeNodes, even when it will make user requests fail. When
  6215. StrictNodes is *not* set, then Tor should follow ExcludeNodes
  6216. whenever it can, except when it must use an excluded node to
  6217. perform self-tests, connect to a hidden service, provide a
  6218. hidden service, fulfill a .exit request, upload directory
  6219. information, or fetch directory information.
  6220. Collectively, the changes to implement the behavior fix bug 1090.
  6221. - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
  6222. change during a config reload, mark and discard all our origin
  6223. circuits. This fix should address edge cases where we change the
  6224. config options and but then choose a circuit that we created before
  6225. the change.
  6226. - Make EntryNodes config option much more aggressive even when
  6227. StrictNodes is not set. Before it would prepend your requested
  6228. entrynodes to your list of guard nodes, but feel free to use others
  6229. after that. Now it chooses only from your EntryNodes if any of
  6230. those are available, and only falls back to others if a) they're
  6231. all down and b) StrictNodes is not set.
  6232. - Now we refresh your entry guards from EntryNodes at each consensus
  6233. fetch -- rather than just at startup and then they slowly rot as
  6234. the network changes.
  6235. - Add support for the country code "{??}" in torrc options like
  6236. ExcludeNodes, to indicate all routers of unknown country. Closes
  6237. bug 1094.
  6238. - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
  6239. a node is listed in both, it's treated as excluded.
  6240. - ExcludeNodes now applies to directory nodes -- as a preference if
  6241. StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
  6242. Don't exclude all the directory authorities and set StrictNodes to 1
  6243. unless you really want your Tor to break.
  6244. - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
  6245. - ExcludeExitNodes now overrides .exit requests.
  6246. - We don't use bridges listed in ExcludeNodes.
  6247. - When StrictNodes is 1:
  6248. . We now apply ExcludeNodes to hidden service introduction points
  6249. and to rendezvous points selected by hidden service users. This
  6250. can make your hidden service less reliable: use it with caution!
  6251. . If we have used ExcludeNodes on ourself, do not try relay
  6252. reachability self-tests.
  6253. . If we have excluded all the directory authorities, we will not
  6254. even try to upload our descriptor if we're a relay.
  6255. . Do not honor .exit requests to an excluded node.
  6256. - When the set of permitted nodes changes, we now remove any mappings
  6257. introduced via TrackExitHosts to now-excluded nodes. Bugfix on
  6259. - We never cannibalize a circuit that had excluded nodes on it, even
  6260. if StrictNodes is 0. Bugfix on
  6261. - Improve log messages related to excluded nodes.
  6262. o Major features (misc):
  6263. - Numerous changes, bugfixes, and workarounds from Nathan Freitas
  6264. to help Tor build correctly for Android phones.
  6265. - The options SocksPort, ControlPort, and so on now all accept a
  6266. value "auto" that opens a socket on an OS-selected port. A
  6267. new ControlPortWriteToFile option tells Tor to write its
  6268. actual control port or ports to a chosen file. If the option
  6269. ControlPortFileGroupReadable is set, the file is created as
  6270. group-readable. Now users can run two Tor clients on the same
  6271. system without needing to manually mess with parameters. Resolves
  6272. part of ticket 3076.
  6273. - Tor now supports tunneling all of its outgoing connections over
  6274. a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
  6275. configuration options. Code by Christopher Davis.
  6276. o Code security improvements:
  6277. - Replace all potentially sensitive memory comparison operations
  6278. with versions whose runtime does not depend on the data being
  6279. compared. This will help resist a class of attacks where an
  6280. adversary can use variations in timing information to learn
  6281. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  6282. implementation by Robert Ransom based partially on code by DJB.)
  6283. - Enable Address Space Layout Randomization (ASLR) and Data Execution
  6284. Prevention (DEP) by default on Windows to make it harder for
  6285. attackers to exploit vulnerabilities. Patch from John Brooks.
  6286. - New "--enable-gcc-hardening" ./configure flag (off by default)
  6287. to turn on gcc compile time hardening options. It ensures
  6288. that signed ints have defined behavior (-fwrapv), enables
  6289. -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
  6290. with canaries (-fstack-protector-all), turns on ASLR protection if
  6291. supported by the kernel (-fPIE, -pie), and adds additional security
  6292. related warnings. Verified to work on Mac OS X and Debian Lenny.
  6293. - New "--enable-linker-hardening" ./configure flag (off by default)
  6294. to turn on ELF specific hardening features (relro, now). This does
  6295. not work with Mac OS X or any other non-ELF binary format.
  6296. - Always search the Windows system directory for system DLLs, and
  6297. nowhere else. Bugfix on; fixes bug 1954.
  6298. - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
  6299. current and future memory pages via mlockall(). On supported
  6300. platforms (modern Linux and probably BSD but not Windows or OS X),
  6301. this should effectively disable any and all attempts to page out
  6302. memory. This option requires that you start your Tor as root --
  6303. if you use DisableAllSwap, please consider using the User option
  6304. to properly reduce the privileges of your Tor.
  6305. o Major bugfixes (crashes):
  6306. - Fix crash bug on platforms where gmtime and localtime can return
  6307. NULL. Windows 7 users were running into this one. Fixes part of bug
  6308. 2077. Bugfix on all versions of Tor. Found by boboper.
  6309. - Introduce minimum/maximum values that clients will believe
  6310. from the consensus. Now we'll have a better chance to avoid crashes
  6311. or worse when a consensus param has a weird value.
  6312. - Fix a rare crash bug that could occur when a client was configured
  6313. with a large number of bridges. Fixes bug 2629; bugfix on
  6314. Bugfix by trac user "shitlei".
  6315. - Do not crash when our configuration file becomes unreadable, for
  6316. example due to a permissions change, between when we start up
  6317. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  6318. on 0.0.9pre6.
  6319. - If we're in the pathological case where there's no exit bandwidth
  6320. but there is non-exit bandwidth, or no guard bandwidth but there
  6321. is non-guard bandwidth, don't crash during path selection. Bugfix
  6322. on
  6323. - Fix a crash bug when trying to initialize the evdns module in
  6324. Libevent 2. Bugfix on
  6325. o Major bugfixes (stability):
  6326. - Fix an assert in parsing router descriptors containing IPv6
  6327. addresses. This one took down the directory authorities when
  6328. somebody tried some experimental code. Bugfix on
  6329. - Fix an uncommon assertion failure when running with DNSPort under
  6330. heavy load. Fixes bug 2933; bugfix on
  6331. - Treat an unset $HOME like an empty $HOME rather than triggering an
  6332. assert. Bugfix on 0.0.8pre1; fixes bug 1522.
  6333. - More gracefully handle corrupt state files, removing asserts
  6334. in favor of saving a backup and resetting state.
  6335. - Instead of giving an assertion failure on an internal mismatch
  6336. on estimated freelist size, just log a BUG warning and try later.
  6337. Mitigates but does not fix bug 1125.
  6338. - Fix an assert that got triggered when using the TestingTorNetwork
  6339. configuration option and then issuing a GETINFO config-text control
  6340. command. Fixes bug 2250; bugfix on
  6341. - If the cached cert file is unparseable, warn but don't exit.
  6342. o Privacy fixes (relays/bridges):
  6343. - Don't list Windows capabilities in relay descriptors. We never made
  6344. use of them, and maybe it's a bad idea to publish them. Bugfix
  6345. on
  6346. - If the Nickname configuration option isn't given, Tor would pick a
  6347. nickname based on the local hostname as the nickname for a relay.
  6348. Because nicknames are not very important in today's Tor and the
  6349. "Unnamed" nickname has been implemented, this is now problematic
  6350. behavior: It leaks information about the hostname without being
  6351. useful at all. Fixes bug 2979; bugfix on, which
  6352. introduced the Unnamed nickname. Reported by tagnaq.
  6353. - Maintain separate TLS contexts and certificates for incoming and
  6354. outgoing connections in bridge relays. Previously we would use the
  6355. same TLS contexts and certs for incoming and outgoing connections.
  6356. Bugfix on; addresses bug 988.
  6357. - Maintain separate identity keys for incoming and outgoing TLS
  6358. contexts in bridge relays. Previously we would use the same
  6359. identity keys for incoming and outgoing TLS contexts. Bugfix on
  6360.; addresses the other half of bug 988.
  6361. - Make the bridge directory authority refuse to answer directory
  6362. requests for "all descriptors". It used to include bridge
  6363. descriptors in its answer, which was a major information leak.
  6364. Found by "piebeer". Bugfix on
  6365. o Privacy fixes (clients):
  6366. - When receiving a hidden service descriptor, check that it is for
  6367. the hidden service we wanted. Previously, Tor would store any
  6368. hidden service descriptors that a directory gave it, whether it
  6369. wanted them or not. This wouldn't have let an attacker impersonate
  6370. a hidden service, but it did let directories pre-seed a client
  6371. with descriptors that it didn't want. Bugfix on 0.0.6.
  6372. - Start the process of disabling ".exit" address notation, since it
  6373. can be used for a variety of esoteric application-level attacks
  6374. on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
  6375. on 0.0.9rc5.
  6376. - Reject attempts at the client side to open connections to private
  6377. IP addresses (like,, and so on) with
  6378. a randomly chosen exit node. Attempts to do so are always
  6379. ill-defined, generally prevented by exit policies, and usually
  6380. in error. This will also help to detect loops in transparent
  6381. proxy configurations. You can disable this feature by setting
  6382. "ClientRejectInternalAddresses 0" in your torrc.
  6383. - Log a notice when we get a new control connection. Now it's easier
  6384. for security-conscious users to recognize when a local application
  6385. is knocking on their controller door. Suggested by bug 1196.
  6386. o Privacy fixes (newnym):
  6387. - Avoid linkability based on cached hidden service descriptors: forget
  6388. all hidden service descriptors cached as a client when processing a
  6389. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  6390. - On SIGHUP, do not clear out all TrackHostExits mappings, client
  6391. DNS cache entries, and virtual address mappings: that's what
  6392. NEWNYM is for. Fixes bug 1345; bugfix on
  6393. - Don't attach new streams to old rendezvous circuits after SIGNAL
  6394. NEWNYM. Previously, we would keep using an existing rendezvous
  6395. circuit if it remained open (i.e. if it were kept open by a
  6396. long-lived stream, or if a new stream were attached to it before
  6397. Tor could notice that it was old and no longer in use). Bugfix on
  6398.; fixes bug 3375.
  6399. o Major bugfixes (relay bandwidth accounting):
  6400. - Fix a bug that could break accounting on 64-bit systems with large
  6401. time_t values, making them hibernate for impossibly long intervals.
  6402. Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
  6403. - Fix a bug in bandwidth accounting that could make us use twice
  6404. the intended bandwidth when our interval start changes due to
  6405. daylight saving time. Now we tolerate skew in stored vs computed
  6406. interval starts: if the start of the period changes by no more than
  6407. 50% of the period's duration, we remember bytes that we transferred
  6408. in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
  6409. o Major bugfixes (bridges):
  6410. - Bridges now use "reject *:*" as their default exit policy. Bugfix
  6411. on Fixes bug 1113.
  6412. - If you configure your bridge with a known identity fingerprint,
  6413. and the bridge authority is unreachable (as it is in at least
  6414. one country now), fall back to directly requesting the descriptor
  6415. from the bridge. Finishes the feature started in;
  6416. closes bug 1138.
  6417. - Fix a bug where bridge users who configure the non-canonical
  6418. address of a bridge automatically switch to its canonical
  6419. address. If a bridge listens at more than one address, it
  6420. should be able to advertise those addresses independently and
  6421. any non-blocked addresses should continue to work. Bugfix on Tor
  6422. Fixes bug 2510.
  6423. - If you configure Tor to use bridge A, and then quit and
  6424. configure Tor to use bridge B instead (or if you change Tor
  6425. to use bridge B via the controller), it would happily continue
  6426. to use bridge A if it's still reachable. While this behavior is
  6427. a feature if your goal is connectivity, in some scenarios it's a
  6428. dangerous bug. Bugfix on Tor; fixes bug 2511.
  6429. - When the controller configures a new bridge, don't wait 10 to 60
  6430. seconds before trying to fetch its descriptor. Bugfix on
  6431.; fixes bug 3198 (suggested by 2355).
  6432. o Major bugfixes (directory authorities):
  6433. - Many relays have been falling out of the consensus lately because
  6434. not enough authorities know about their descriptor for them to get
  6435. a majority of votes. When we deprecated the v2 directory protocol,
  6436. we got rid of the only way that v3 authorities can hear from each
  6437. other about other descriptors. Now authorities examine every v3
  6438. vote for new descriptors, and fetch them from that authority. Bugfix
  6439. on
  6440. - Authorities could be tricked into giving out the Exit flag to relays
  6441. that didn't allow exiting to any ports. This bug could screw
  6442. with load balancing and stats. Bugfix on; fixes bug
  6443. 1238. Bug discovered by Martin Kowalczyk.
  6444. - If all authorities restart at once right before a consensus vote,
  6445. nobody will vote about "Running", and clients will get a consensus
  6446. with no usable relays. Instead, authorities refuse to build a
  6447. consensus if this happens. Bugfix on; fixes bug 1066.
  6448. o Major bugfixes (stream-level fairness):
  6449. - When receiving a circuit-level SENDME for a blocked circuit, try
  6450. to package cells fairly from all the streams that had previously
  6451. been blocked on that circuit. Previously, we had started with the
  6452. oldest stream, and allowed each stream to potentially exhaust
  6453. the circuit's package window. This gave older streams on any
  6454. given circuit priority over newer ones. Fixes bug 1937. Detected
  6455. originally by Camilo Viecco. This bug was introduced before the
  6456. first Tor release, in svn commit r152: it is the new winner of
  6457. the longest-lived bug prize.
  6458. - Fix a stream fairness bug that would cause newer streams on a given
  6459. circuit to get preference when reading bytes from the origin or
  6460. destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
  6461. introduced before the first Tor release, in svn revision r152.
  6462. - When the exit relay got a circuit-level sendme cell, it started
  6463. reading on the exit streams, even if had 500 cells queued in the
  6464. circuit queue already, so the circuit queue just grew and grew in
  6465. some cases. We fix this by not re-enabling reading on receipt of a
  6466. sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
  6467. on Detected by Mashael AlSabah. Original patch by
  6468. "yetonetime".
  6469. - Newly created streams were allowed to read cells onto circuits,
  6470. even if the circuit's cell queue was blocked and waiting to drain.
  6471. This created potential unfairness, as older streams would be
  6472. blocked, but newer streams would gladly fill the queue completely.
  6473. We add code to detect this situation and prevent any stream from
  6474. getting more than one free cell. Bugfix on Partially
  6475. fixes bug 1298.
  6476. o Major bugfixes (hidden services):
  6477. - Apply circuit timeouts to opened hidden-service-related circuits
  6478. based on the correct start time. Previously, we would apply the
  6479. circuit build timeout based on time since the circuit's creation;
  6480. it was supposed to be applied based on time since the circuit
  6481. entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
  6482. - Improve hidden service robustness: When we find that we have
  6483. extended a hidden service's introduction circuit to a relay not
  6484. listed as an introduction point in the HS descriptor we currently
  6485. have, retry with an introduction point from the current
  6486. descriptor. Previously we would just give up. Fixes bugs 1024 and
  6487. 1930; bugfix on
  6488. - Directory authorities now use data collected from their own
  6489. uptime observations when choosing whether to assign the HSDir flag
  6490. to relays, instead of trusting the uptime value the relay reports in
  6491. its descriptor. This change helps prevent an attack where a small
  6492. set of nodes with frequently-changing identity keys can blackhole
  6493. a hidden service. (Only authorities need upgrade; others will be
  6494. fine once they do.) Bugfix on; fixes bug 2709.
  6495. - Stop assigning the HSDir flag to relays that disable their
  6496. DirPort (and thus will refuse to answer directory requests). This
  6497. fix should dramatically improve the reachability of hidden services:
  6498. hidden services and hidden service clients pick six HSDir relays
  6499. to store and retrieve the hidden service descriptor, and currently
  6500. about half of the HSDir relays will refuse to work. Bugfix on
  6501.; fixes part of bug 1693.
  6502. o Major bugfixes (misc):
  6503. - Clients now stop trying to use an exit node associated with a given
  6504. destination by TrackHostExits if they fail to reach that exit node.
  6505. Fixes bug 2999. Bugfix on
  6506. - Fix a regression that caused Tor to rebind its ports if it receives
  6507. SIGHUP while hibernating. Bugfix in; closes bug 919.
  6508. - Remove an extra pair of quotation marks around the error
  6509. message in control-port STATUS_GENERAL BUG events. Bugfix on
  6510.; fixes bug 3732.
  6511. o Minor features (relays):
  6512. - Ensure that no empty [dirreq-](read|write)-history lines are added
  6513. to an extrainfo document. Implements ticket 2497.
  6514. - When bandwidth accounting is enabled, be more generous with how
  6515. much bandwidth we'll use up before entering "soft hibernation".
  6516. Previously, we'd refuse new connections and circuits once we'd
  6517. used up 95% of our allotment. Now, we use up 95% of our allotment,
  6518. AND make sure that we have no more than 500MB (or 3 hours of
  6519. expected traffic, whichever is lower) remaining before we enter
  6520. soft hibernation.
  6521. - Relays now log the reason for publishing a new relay descriptor,
  6522. so we have a better chance of hunting down instances of bug 1810.
  6523. Resolves ticket 3252.
  6524. - Log a little more clearly about the times at which we're no longer
  6525. accepting new connections (e.g. due to hibernating). Resolves
  6526. bug 2181.
  6527. - When AllowSingleHopExits is set, print a warning to explain to the
  6528. relay operator why most clients are avoiding her relay.
  6529. - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
  6530. Clients before didn't handle NOROUTE correctly, but such
  6531. clients are already deprecated because of security bugs.
  6532. o Minor features (network statistics):
  6533. - Directory mirrors that set "DirReqStatistics 1" write statistics
  6534. about directory requests to disk every 24 hours. As compared to the
  6535. "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
  6536. improvements: 1) stats are written to disk exactly every 24 hours;
  6537. 2) estimated shares of v2 and v3 requests are determined as mean
  6538. values, not at the end of a measurement period; 3) unresolved
  6539. requests are listed with country code '??'; 4) directories also
  6540. measure download times.
  6541. - Exit nodes that set "ExitPortStatistics 1" write statistics on the
  6542. number of exit streams and transferred bytes per port to disk every
  6543. 24 hours.
  6544. - Relays that set "CellStatistics 1" write statistics on how long
  6545. cells spend in their circuit queues to disk every 24 hours.
  6546. - Entry nodes that set "EntryStatistics 1" write statistics on the
  6547. rough number and origins of connecting clients to disk every 24
  6548. hours.
  6549. - Relays that write any of the above statistics to disk and set
  6550. "ExtraInfoStatistics 1" include the past 24 hours of statistics in
  6551. their extra-info documents. Implements proposal 166.
  6552. o Minor features (GeoIP and statistics):
  6553. - Provide a log message stating which geoip file we're parsing
  6554. instead of just stating that we're parsing the geoip file.
  6555. Implements ticket 2432.
  6556. - Make sure every relay writes a state file at least every 12 hours.
  6557. Previously, a relay could go for weeks without writing its state
  6558. file, and on a crash could lose its bandwidth history, capacity
  6559. estimates, client country statistics, and so on. Addresses bug 3012.
  6560. - Relays report the number of bytes spent on answering directory
  6561. requests in extra-info descriptors similar to {read,write}-history.
  6562. Implements enhancement 1790.
  6563. - Report only the top 10 ports in exit-port stats in order not to
  6564. exceed the maximum extra-info descriptor length of 50 KB. Implements
  6565. task 2196.
  6566. - If writing the state file to disk fails, wait up to an hour before
  6567. retrying again, rather than trying again each second. Fixes bug
  6568. 2346; bugfix on Tor
  6569. - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
  6570. when we switch from being a public relay to a bridge. Otherwise
  6571. there will still be clients that see the relay in their consensus,
  6572. and the stats will end up wrong. Bugfix on; fixes
  6573. bug 932.
  6574. - Update to the August 2 2011 Maxmind GeoLite Country database.
  6575. o Minor features (clients):
  6576. - When expiring circuits, use microsecond timers rather than
  6577. one-second timers. This can avoid an unpleasant situation where a
  6578. circuit is launched near the end of one second and expired right
  6579. near the beginning of the next, and prevent fluctuations in circuit
  6580. timeout values.
  6581. - If we've configured EntryNodes and our network goes away and/or all
  6582. our entrynodes get marked down, optimistically retry them all when
  6583. a new socks application request appears. Fixes bug 1882.
  6584. - Always perform router selections using weighted relay bandwidth,
  6585. even if we don't need a high capacity circuit at the time. Non-fast
  6586. circuits now only differ from fast ones in that they can use relays
  6587. not marked with the Fast flag. This "feature" could turn out to
  6588. be a horrible bug; we should investigate more before it goes into
  6589. a stable release.
  6590. - When we run out of directory information such that we can't build
  6591. circuits, but then get enough that we can build circuits, log when
  6592. we actually construct a circuit, so the user has a better chance of
  6593. knowing what's going on. Fixes bug 1362.
  6594. - Log SSL state transitions at debug level during handshake, and
  6595. include SSL states in error messages. This may help debug future
  6596. SSL handshake issues.
  6597. o Minor features (directory authorities):
  6598. - When a router changes IP address or port, authorities now launch
  6599. a new reachability test for it. Implements ticket 1899.
  6600. - Directory authorities now reject relays running any versions of
  6601. Tor between and inclusive; they have
  6602. known bugs that keep RELAY_EARLY cells from working on rendezvous
  6603. circuits. Followup to fix for bug 2081.
  6604. - Directory authorities now reject relays running any version of Tor
  6605. older than That version is the earliest that fetches
  6606. current directory information correctly. Fixes bug 2156.
  6607. - Directory authorities now do an immediate reachability check as soon
  6608. as they hear about a new relay. This change should slightly reduce
  6609. the time between setting up a relay and getting listed as running
  6610. in the consensus. It should also improve the time between setting
  6611. up a bridge and seeing use by bridge users.
  6612. - Directory authorities no longer launch a TLS connection to every
  6613. relay as they startup. Now that we have 2k+ descriptors cached,
  6614. the resulting network hiccup is becoming a burden. Besides,
  6615. authorities already avoid voting about Running for the first half
  6616. hour of their uptime.
  6617. - Directory authorities now log the source of a rejected POSTed v3
  6618. networkstatus vote, so we can track failures better.
  6619. - Backport code from 0.2.3.x that allows directory authorities to
  6620. clean their microdescriptor caches. Needed to resolve bug 2230.
  6621. o Minor features (hidden services):
  6622. - Use computed circuit-build timeouts to decide when to launch
  6623. parallel introduction circuits for hidden services. (Previously,
  6624. we would retry after 15 seconds.)
  6625. - Don't allow v0 hidden service authorities to act as clients.
  6626. Required by fix for bug 3000.
  6627. - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
  6628. by fix for bug 3000.
  6629. - Make hidden services work better in private Tor networks by not
  6630. requiring any uptime to join the hidden service descriptor
  6631. DHT. Implements ticket 2088.
  6632. - Log (at info level) when purging pieces of hidden-service-client
  6633. state because of SIGNAL NEWNYM.
  6634. o Minor features (controller interface):
  6635. - New "GETINFO net/listeners/(type)" controller command to return
  6636. a list of addresses and ports that are bound for listeners for a
  6637. given connection type. This is useful when the user has configured
  6638. "SocksPort auto" and the controller needs to know which port got
  6639. chosen. Resolves another part of ticket 3076.
  6640. - Have the controller interface give a more useful message than
  6641. "Internal Error" in response to failed GETINFO requests.
  6642. - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
  6643. event, to give information on the current rate of circuit timeouts
  6644. over our stored history.
  6645. - The 'EXTENDCIRCUIT' control port command can now be used with
  6646. a circ id of 0 and no path. This feature will cause Tor to build
  6647. a new 'fast' general purpose circuit using its own path selection
  6648. algorithms.
  6649. - Added a BUILDTIMEOUT_SET controller event to describe changes
  6650. to the circuit build timeout.
  6651. - New controller command "getinfo config-text". It returns the
  6652. contents that Tor would write if you send it a SAVECONF command,
  6653. so the controller can write the file to disk itself.
  6654. o Minor features (controller protocol):
  6655. - Add a new ControlSocketsGroupWritable configuration option: when
  6656. it is turned on, ControlSockets are group-writeable by the default
  6657. group of the current user. Patch by Jérémy Bobbio; implements
  6658. ticket 2972.
  6659. - Tor now refuses to create a ControlSocket in a directory that is
  6660. world-readable (or group-readable if ControlSocketsGroupWritable
  6661. is 0). This is necessary because some operating systems do not
  6662. enforce permissions on an AF_UNIX sockets. Permissions on the
  6663. directory holding the socket, however, seems to work everywhere.
  6664. - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
  6665. not. This would lead to a cookie that is still not group readable.
  6666. Closes bug 1843. Suggested by katmagic.
  6667. - Future-proof the controller protocol a bit by ignoring keyword
  6668. arguments we do not recognize.
  6669. o Minor features (more useful logging):
  6670. - Revise most log messages that refer to nodes by n