ChangeLog 928 KB

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  1. Changes in version 0.2.6.2-alpha - 2014-12-31
  2. Tor 0.2.6.2-alpha is the second alpha release in the 0.2.6.x series.
  3. It introduces a major new backend for deciding when to send cells on
  4. channels, which should lead down the road to big performance
  5. increases. It contains security and statistics features for better
  6. work on hidden services, and numerous bugfixes.
  7. This release contains many new unit tests, along with major
  8. performance improvements for running testing networks using Chutney.
  9. Thanks to a series of patches contributed by "teor", testing networks
  10. should now bootstrap in seconds, rather than minutes.
  11. o Major features (relay, infrastructure):
  12. - Complete revision of the code that relays use to decide which cell
  13. to send next. Formerly, we selected the best circuit to write on
  14. each channel, but we didn't select among channels in any
  15. sophisticated way. Now, we choose the best circuits globally from
  16. among those whose channels are ready to deliver traffic.
  17. This patch implements a new inter-cmux comparison API, a global
  18. high/low watermark mechanism and a global scheduler loop for
  19. transmission prioritization across all channels as well as among
  20. circuits on one channel. This schedule is currently tuned to
  21. (tolerantly) avoid making changes in network performance, but it
  22. should form the basis for major circuit performance increases in
  23. the future. Code by Andrea; tuning by Rob Jansen; implements
  24. ticket 9262.
  25. o Major features (hidden services):
  26. - Make HS port scanning more difficult by immediately closing the
  27. circuit when a user attempts to connect to a nonexistent port.
  28. Closes ticket 13667.
  29. - Add a HiddenServiceStatistics option that allows Tor relays to
  30. gather and publish statistics about the overall size and volume of
  31. hidden service usage. Specifically, when this option is turned on,
  32. an HSDir will publish an approximate number of hidden services
  33. that have published descriptors to it the past 24 hours. Also, if
  34. a relay has acted as a hidden service rendezvous point, it will
  35. publish the approximate amount of rendezvous cells it has relayed
  36. the past 24 hours. The statistics themselves are obfuscated so
  37. that the exact values cannot be derived. For more details see
  38. proposal 238, "Better hidden service stats from Tor relays". This
  39. feature is currently disabled by default. Implements feature 13192.
  40. o Major bugfixes (client, automap):
  41. - Repair automapping with IPv6 addresses. This automapping should
  42. have worked previously, but one piece of debugging code that we
  43. inserted to detect a regression actually caused the regression to
  44. manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
  45. 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
  46. Izquierdo Riera.
  47. o Major bugfixes (hidden services):
  48. - When closing an introduction circuit that was opened in parallel
  49. with others, don't mark the introduction point as unreachable.
  50. Previously, the first successful connection to an introduction
  51. point would make the other introduction points get marked as
  52. having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
  53. o Directory authority changes:
  54. - Remove turtles as a directory authority.
  55. - Add longclaw as a new (v3) directory authority. This implements
  56. ticket 13296. This keeps the directory authority count at 9.
  57. o Major removed features:
  58. - Tor clients no longer support connecting to hidden services
  59. running on Tor 0.2.2.x and earlier; the Support022HiddenServices
  60. option has been removed. (There shouldn't be any hidden services
  61. running these versions on the network.) Closes ticket 7803.
  62. o Minor features (client):
  63. - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
  64. is enabled, reject requests with IP addresses as hostnames.
  65. Resolves ticket 13315.
  66. o Minor features (controller):
  67. - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
  68. write an unscheduled heartbeat message to the log. Implements
  69. feature 9503.
  70. o Minor features (geoip):
  71. - Update geoip and geoip6 to the November 15 2014 Maxmind GeoLite2
  72. Country database.
  73. o Minor features (hidden services):
  74. - When re-enabling the network, don't try to build introduction
  75. circuits until we have successfully built a circuit. This makes
  76. hidden services come up faster when the network is re-enabled.
  77. Patch from "akwizgran". Closes ticket 13447.
  78. - When we fail to a retrieve hidden service descriptor, send the
  79. controller an "HS_DESC FAILED" controller event. Implements
  80. feature 13212.
  81. - New HiddenServiceDirGroupReadable option to cause hidden service
  82. directories and hostname files to be created group-readable. Patch
  83. from "anon", David Stainton, and "meejah". Closes ticket 11291.
  84. o Minor features (systemd):
  85. - Where supported, when running with systemd, report successful
  86. startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
  87. - When running with systemd, support systemd watchdog messages. Part
  88. of ticket 11016. Patch by Michael Scherer.
  89. o Minor features (transparent proxy):
  90. - Update the transparent proxy option checks to allow for both ipfw
  91. and pf on OS X. Closes ticket 14002.
  92. - Use the correct option when using IPv6 with transparent proxy
  93. support on Linux. Resolves 13808. Patch by Francisco Blas
  94. Izquierdo Riera.
  95. o Minor bugfixes (preventative security, C safety):
  96. - When reading a hexadecimal, base-32, or base-64 encoded value from
  97. a string, always overwrite the whole output buffer. This prevents
  98. some bugs where we would look at (but fortunately, not reveal)
  99. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  100. versions of Tor.
  101. - Clear all memory targetted by tor_addr_{to,from}_sockaddr(), not
  102. just the part that's used. This makes it harder for data leak bugs
  103. to occur in the event of other programming failures. Resolves
  104. ticket 14041.
  105. o Minor bugfixes (client, microdescriptors):
  106. - Use a full 256 bits of the SHA256 digest of a microdescriptor when
  107. computing which microdescriptors to download. This keeps us from
  108. erroneous download behavior if two microdescriptor digests ever
  109. have the same first 160 bits. Fixes part of bug 13399; bugfix
  110. on 0.2.3.1-alpha.
  111. - Reset a router's status if its microdescriptor digest changes,
  112. even if the first 160 bits remain the same. Fixes part of bug
  113. 13399; bugfix on 0.2.3.1-alpha.
  114. o Minor bugfixes (compilation):
  115. - Silence clang warnings under --enable-expensive-hardening,
  116. including implicit truncation of 64 bit values to 32 bit, const
  117. char assignment to self, tautological compare, and additional
  118. parentheses around equality tests. Fixes bug 13577; bugfix
  119. on 0.2.5.4-alpha.
  120. - Fix a clang warning about checking whether an address in the
  121. middle of a structure is NULL. Fixes bug 14001; bugfix
  122. on 0.2.1.2-alpha.
  123. o Minor bugfixes (hidden services):
  124. - Correctly send a controller event when we find that a rendezvous
  125. circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
  126. - Pre-check directory permissions for new hidden-services to avoid
  127. at least one case of "Bug: Acting on config options left us in a
  128. broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
  129. - When adding a new hidden service (for example, via SETCONF), Tor
  130. no longer congratulates the user for running a relay. Fixes bug
  131. 13941; bugfix on 0.2.6.1-alpha.
  132. - When fetching hidden service descriptors, we now check not only
  133. for whether we got the hidden service we had in mind, but also
  134. whether we got the particular descriptors we wanted. This prevents
  135. a class of inefficient but annoying DoS attacks by hidden service
  136. directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
  137. by "special".
  138. o Minor bugfixes (Linux seccomp2 sandbox):
  139. - Make transparent proxy support work along with the seccomp2
  140. sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
  141. by Francisco Blas Izquierdo Riera.
  142. - Fix a memory leak in tor-resolve when running with the sandbox
  143. enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
  144. o Minor bugfixes (logging):
  145. - Downgrade warnings about RSA signature failures to info log level.
  146. Emit a warning when an extra info document is found incompatible
  147. with a corresponding router descriptor. Fixes bug 9812; bugfix
  148. on 0.0.6rc3.
  149. - Make connection_ap_handshake_attach_circuit() log the circuit ID
  150. correctly. Fixes bug 13701; bugfix on 0.0.6.
  151. o Minor bugfixes (misc):
  152. - Stop allowing invalid address patterns like "*/24" that contain
  153. both a wildcard address and a bit prefix length. This affects all
  154. our address-range parsing code. Fixes bug 7484; bugfix
  155. on 0.0.2pre14.
  156. o Minor bugfixes (testing networks, fast startup):
  157. - Allow Tor to build circuits using a consensus with no exits. If
  158. the consensus has no exits (typical of a bootstrapping test
  159. network), allow Tor to build circuits once enough descriptors have
  160. been downloaded. This assists in bootstrapping a testing Tor
  161. network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
  162. by "teor".
  163. - When V3AuthVotingInterval is low, give a lower If-Modified-Since
  164. header to directory servers. This allows us to obtain consensuses
  165. promptly when the consensus interval is very short. This assists
  166. in bootstrapping a testing Tor network. Fixes parts of bugs 13718
  167. and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
  168. - Stop assuming that private addresses are local when checking
  169. reachability in a TestingTorNetwork. Instead, when testing, assume
  170. all OR connections are remote. (This is necessary due to many test
  171. scenarios running all relays on localhost.) This assists in
  172. bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
  173. 0.1.0.1-rc. Patch by "teor".
  174. - Avoid building exit circuits from a consensus with no exits. Now
  175. thanks to our fix for 13718, we accept a no-exit network as not
  176. wholly lost, but we need to remember not to try to build exit
  177. circuits on it. Closes ticket 13814; patch by "teor".
  178. - Stop requiring exits to have non-zero bandwithcapacity in a
  179. TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
  180. ignore exit bandwidthcapacity. This assists in bootstrapping a
  181. testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
  182. on 0.2.0.3-alpha. Patch by "teor".
  183. - Add "internal" to some bootstrap statuses when no exits are
  184. available. If the consensus does not contain Exits, Tor will only
  185. build internal circuits. In this case, relevant statuses will
  186. contain the word "internal" as indicated in the Tor control-
  187. spec.txt. When bootstrap completes, Tor will be ready to build
  188. internal circuits. If a future consensus contains Exits, exit
  189. circuits may become available. Fixes part of bug 13718; bugfix on
  190. 0.2.4.10-alpha. Patch by "teor".
  191. - Decrease minimum consensus interval to 10 seconds when
  192. TestingTorNetwork is set, or 5 seconds for the first consensus.
  193. Fix assumptions throughout the code that assume larger intervals.
  194. Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
  195. by "teor".
  196. - Avoid excluding guards from path building in minimal test
  197. networks, when we're in a test network and excluding guards would
  198. exclude all relays. This typically occurs in incredibly small tor
  199. networks, and those using "TestingAuthVoteGuard *". Fixes part of
  200. bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
  201. o Code simplification and refactoring:
  202. - Stop using can_complete_circuits as a global variable; access it
  203. with a function instead.
  204. - Avoid using operators directly as macro arguments: this lets us
  205. apply coccinelle transformations to our codebase more directly.
  206. Closes ticket 13172.
  207. - Combine the functions used to parse ClientTransportPlugin and
  208. ServerTransportPlugin into a single function. Closes ticket 6456.
  209. - Add inline functions and convenience macros for inspecting channel
  210. state. Refactor the code to use convenience macros instead of
  211. checking channel state directly. Fixes issue 7356.
  212. - Document all members of was_router_added_t and rename
  213. ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
  214. confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
  215. - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
  216. constant instead of hardcoded value. Fixes issue 13840.
  217. - Refactor our generic strmap and digestmap types into a single
  218. implementation, so that we can add a new digest256map
  219. type trivially.
  220. o Documentation:
  221. - Document the bridge-authority-only 'networkstatus-bridges' file.
  222. Closes ticket 13713; patch from "tom".
  223. - Fix typo in PredictedPortsRelevanceTime option description in
  224. manpage. Resolves issue 13707.
  225. - Stop suggesting that users specify relays by nickname: it isn't a
  226. good idea. Also, properly cross-reference how to specify relays in
  227. all parts of manual documenting options that take a list of
  228. relays. Closes ticket 13381.
  229. - Clarify the HiddenServiceDir option description in manpage to make
  230. it clear that relative paths are taken with respect to the current
  231. working directory. Also clarify that this behavior is not
  232. guaranteed to remain indefinitely. Fixes issue 13913.
  233. o Testing:
  234. - New tests for many parts of channel, relay, and circuitmux
  235. functionality. Code by Andrea; part of 9262.
  236. - New tests for parse_transport_line(). Part of ticket 6456.
  237. - In the unit tests, use chgrp() to change the group of the unit
  238. test temporary directory to the current user, so that the sticky
  239. bit doesn't interfere with tests that check directory groups.
  240. Closes 13678.
  241. - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
  242. by 'rl1987'.
  243. Changes in version 0.2.6.1-alpha - 2014-10-30
  244. Tor 0.2.6.1-alpha is the first release in the Tor 0.2.6.x series. It
  245. includes numerous code cleanups and new tests, and fixes a large
  246. number of annoying bugs. Out-of-memory conditions are handled better
  247. than in 0.2.5, pluggable transports have improved proxy support, and
  248. clients now use optimistic data for contacting hidden services. Also,
  249. we are now more robust to changes in what we consider a parseable
  250. directory object, so that tightening restrictions does not have a risk
  251. of introducing infinite download loops.
  252. This is the first alpha release in a new series, so expect there to be
  253. bugs. Users who would rather test out a more stable branch should stay
  254. with 0.2.5.x for now.
  255. o New compiler and system requirements:
  256. - Tor 0.2.6.x requires that your compiler support more of the C99
  257. language standard than before. The 'configure' script now detects
  258. whether your compiler supports C99 mid-block declarations and
  259. designated initializers. If it does not, Tor will not compile.
  260. We may revisit this requirement if it turns out that a significant
  261. number of people need to build Tor with compilers that don't
  262. bother implementing a 15-year-old standard. Closes ticket 13233.
  263. - Tor no longer supports systems without threading support. When we
  264. began working on Tor, there were several systems that didn't have
  265. threads, or where the thread support wasn't able to run the
  266. threads of a single process on multiple CPUs. That no longer
  267. holds: every system where Tor needs to run well now has threading
  268. support. Resolves ticket 12439.
  269. o Removed platform support:
  270. - We no longer include special code to build on Windows CE; as far
  271. as we know, nobody has used Tor on Windows CE in a very long time.
  272. Closes ticket 11446.
  273. o Major features (bridges):
  274. - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
  275. transports if they are configured via the "TOR_PT_PROXY"
  276. environment variable. Implements proposal 232. Resolves
  277. ticket 8402.
  278. o Major features (client performance, hidden services):
  279. - Allow clients to use optimistic data when connecting to a hidden
  280. service, which should remove a round-trip from hidden service
  281. initialization. See proposal 181 for details. Implements
  282. ticket 13211.
  283. o Major features (directory system):
  284. - Upon receiving an unparseable directory object, if its digest
  285. matches what we expected, then don't try to download it again.
  286. Previously, when we got a descriptor we didn't like, we would keep
  287. trying to download it over and over. Closes ticket 11243.
  288. o Major features (sample torrc):
  289. - Add a new, infrequently-changed "torrc.minimal". This file is
  290. similar to torrc.sample, but it will change as infrequently as
  291. possible, for the benefit of users whose systems prompt them for
  292. intervention whenever a default configuration file is changed.
  293. Making this change allows us to update torrc.sample to be a more
  294. generally useful "sample torrc".
  295. o Major bugfixes (directory authorities):
  296. - Do not assign the HSDir flag to relays if they are not Valid, or
  297. currently hibernating. Fixes #12573. Bugfix on tor-0.2.0.10-alpha
  298. o Major bugfixes (directory bandwidth performance):
  299. - Don't flush the zlib buffer aggressively when compressing
  300. directory information for clients. This should save about 7% of
  301. the bandwidth currently used for compressed descriptors and
  302. microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
  303. o Minor features (security, memory wiping):
  304. - Ensure we securely wipe keys from memory after
  305. crypto_digest_get_digest and init_curve25519_keypair_from_file
  306. have finished using them. Resolves ticket 13477.
  307. o Minor features (security, out-of-memory handling):
  308. - When handling an out-of-memory condition, allocate less memory for
  309. temporary data structures. Fixes issue 10115.
  310. - When handling an out-of-memory condition, consider more types of
  311. buffers, including those on directory connections, and zlib
  312. buffers. Resolves ticket 11792.
  313. o Minor features:
  314. - When identity keypair is generated for first time, log a
  315. congratulatory message that links to the new relay lifecycle
  316. document. Implements feature 10427.
  317. o Minor features (client):
  318. - Clients are now willing to send optimistic data (before they
  319. receive a 'connected' cell) to relays of any version. (Relays
  320. without support for optimistic data are no longer supported on the
  321. Tor network.) Resolves ticket 13153.
  322. o Minor features (directory authorities):
  323. - Don't list relays with a bandwidth estimate of 0 in the consensus.
  324. Implements a feature proposed during discussion of bug 13000.
  325. - In tor-gencert, report an error if the user provides the same
  326. argument more than once.
  327. - If a directory authority can't find a best consensus method in the
  328. votes that it holds, it now falls back to its favorite consensus
  329. method. Previously, it fell back to method 1. Neither of these is
  330. likely to get enough signatures, but "fall back to favorite"
  331. doesn't require us to maintain support an obsolete consensus
  332. method. Implements part of proposal 215.
  333. o Minor features (logging):
  334. - On Unix-like systems, you can now use named pipes as the target of
  335. the Log option, and other options that try to append to files.
  336. Closes ticket 12061. Patch from "carlo von lynX".
  337. - When opening a log file at startup, send it every log message that
  338. we generated between startup and opening it. Previously, log
  339. messages that were generated before opening the log file were only
  340. logged to stdout. Closes ticket 6938.
  341. - Add a TruncateLogFile option to overwrite logs instead of
  342. appending to them. Closes ticket #5583.
  343. o Minor features (portability, Solaris):
  344. - Threads are no longer disabled by default on Solaris; we believe
  345. that the versions of Solaris with broken threading support are all
  346. obsolete by now. Resolves ticket 9495.
  347. o Minor features (relay):
  348. - Re-check our address after we detect a changed IP address from
  349. getsockname(). This ensures that the controller command "GETINFO
  350. address" will report the correct value. Resolves ticket 11582.
  351. Patch from "ra".
  352. - A new AccountingRule option lets Relays set whether they'd like
  353. AccountingMax to be applied separately to inbound and outbound
  354. traffic, or applied to the sum of inbound and outbound traffic.
  355. Resolves ticket 961. Patch by "chobe".
  356. o Minor features (testing networks):
  357. - Add the TestingDirAuthVoteExit option, which lists nodes to assign
  358. the "Exit" flag regardless of their uptime, bandwidth, or exit
  359. policy. TestingTorNetwork must be set for this option to have any
  360. effect. Previously, authorities would take up to 35 minutes to
  361. give nodes the Exit flag in a test network. Partially implements
  362. ticket 13161.
  363. o Minor features (validation):
  364. - Check all date/time values passed to tor_timegm and
  365. parse_rfc1123_time for validity, taking leap years into account.
  366. Improves HTTP header validation. Implemented with bug 13476.
  367. - In correct_tm(), limit the range of values returned by system
  368. localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
  369. This means we don't have to deal with negative or too large dates,
  370. even if a clock is wrong. Otherwise we might fail to read a file
  371. written by us which includes such a date. Fixes bug 13476.
  372. o Minor bugfixes (bridge clients):
  373. - When configured to use a bridge without an identity digest (not
  374. recommended), avoid launching an extra channel to it when
  375. bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
  376. o Minor bugfixes (bridges):
  377. - When DisableNetwork is set, do not launch pluggable transport
  378. plugins, and if any are running, terminate them. Fixes bug 13213;
  379. bugfix on 0.2.3.6-alpha.
  380. o Minor bugfixes (C correctness):
  381. - Fix several instances of possible integer overflow/underflow/NaN.
  382. Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
  383. from "teor".
  384. - In circuit_build_times_calculate_timeout() in circuitstats.c,
  385. avoid dividing by zero in the pareto calculations. This traps
  386. under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
  387. on tor-0.2.2.2-alpha.
  388. - Fix an integer overflow in format_time_interval(). Fixes bug
  389. 13393; bugfix on 0.2.0.10-alpha.
  390. - Set the correct day of year value when the system's localtime(_r)
  391. or gmtime(_r) functions fail to set struct tm. Not externally
  392. visible. Fixes bug 13476; bugfix on 0.0.2pre14.
  393. - Avoid unlikely signed integer overflow in tor_timegm on systems
  394. with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
  395. o Minor bugfixes (client):
  396. - Fix smartlist_choose_node_by_bandwidth() so that relays with the
  397. BadExit flag are not considered worthy candidates. Fixes bug
  398. 13066; bugfix on 0.1.2.3-alpha.
  399. - Use the consensus schedule for downloading consensuses, and not
  400. the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
  401. - Handle unsupported or malformed SOCKS5 requests properly by
  402. responding with the appropriate error message before closing the
  403. connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
  404. o Minor bugfixes (client, torrc):
  405. - Stop modifying the value of our DirReqStatistics torrc option just
  406. because we're not a bridge or relay. This bug was causing Tor
  407. Browser users to write "DirReqStatistics 0" in their torrc files
  408. as if they had chosen to change the config. Fixes bug 4244; bugfix
  409. on 0.2.3.1-alpha.
  410. - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
  411. that our options have changed every time we SIGHUP. Fixes bug
  412. 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
  413. o Minor bugfixes (controller):
  414. - Return an error when the second or later arguments of the
  415. "setevents" controller command are invalid events. Previously we
  416. would return success while silently skipping invalid events. Fixes
  417. bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
  418. o Minor bugfixes (directory system):
  419. - Always believe that v3 directory authorities serve extra-info
  420. documents, whether they advertise "caches-extra-info" or not.
  421. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  422. - When running as a v3 directory authority, advertise that you serve
  423. extra-info documents so that clients who want them can find them
  424. from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  425. - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
  426. Previously, directories offering BRIDGE_DIRINFO and some other
  427. flag (i.e. microdescriptors or extrainfo) would be ignored when
  428. looking for bridges. Partially fixes bug 13163; bugfix
  429. on 0.2.0.7-alpha.
  430. o Minor bugfixes (networking):
  431. - Check for orconns and use connection_or_close_for_error() rather
  432. than connection_mark_for_close() directly in the getsockopt()
  433. failure case of connection_handle_write_impl(). Fixes bug 11302;
  434. bugfix on 0.2.4.4-alpha.
  435. o Minor bugfixes (relay):
  436. - When generating our family list, remove spaces from around the
  437. entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
  438. - If our previous bandwidth estimate was 0 bytes, allow publishing a
  439. new relay descriptor immediately. Fixes bug 13000; bugfix
  440. on 0.1.1.6-alpha.
  441. o Minor bugfixes (testing networks):
  442. - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
  443. testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
  444. - Stop using the default authorities in networks which provide both
  445. AlternateDirAuthority and AlternateBridgeAuthority. Partially
  446. fixes bug 13163; bugfix on 0.2.0.13-alpha.
  447. o Minor bugfixes (testing):
  448. - Stop spawn test failures due to a race condition between the
  449. SIGCHLD handler updating the process status, and the test reading
  450. it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
  451. o Minor bugfixes (testing, Windows):
  452. - Avoid passing an extra backslash when creating a temporary
  453. directory for running the unit tests on Windows. Fixes bug 12392;
  454. bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
  455. o Minor bugfixes (windows):
  456. - Remove code to special-case handling of NTE_BAD_KEYSET when
  457. acquiring windows CryptoAPI context. This error can't actually
  458. occur for the parameters we're providing. Fixes bug 10816; bugfix
  459. on 0.0.2pre26.
  460. o Minor bugfixes (zlib):
  461. - Avoid truncating a zlib stream when trying to finalize it with an
  462. empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
  463. o Build fixes:
  464. - Allow our configure script to build correctly with autoconf 2.62
  465. again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
  466. - Improve the error message from ./configure to make it clear that
  467. when asciidoc has not been found, the user will have to either add
  468. --disable-asciidoc argument or install asciidoc. Resolves
  469. ticket 13228.
  470. o Code simplification and refactoring:
  471. - Change the entry_is_live() function to take named bitfield
  472. elements instead of an unnamed list of booleans. Closes
  473. ticket 12202.
  474. - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
  475. Resolves ticket 12205.
  476. - Use calloc and reallocarray functions instead of multiply-
  477. then-malloc. This makes it less likely for us to fall victim to an
  478. integer overflow attack when allocating. Resolves ticket 12855.
  479. - Use the standard macro name SIZE_MAX, instead of our
  480. own SIZE_T_MAX.
  481. - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
  482. functions which take them as arguments. Replace 0 with NO_DIRINFO
  483. in a function call for clarity. Seeks to prevent future issues
  484. like 13163.
  485. - Avoid 4 null pointer errors under clang static analysis by using
  486. tor_assert() to prove that the pointers aren't null. Fixes
  487. bug 13284.
  488. - Rework the API of policies_parse_exit_policy() to use a bitmask to
  489. represent parsing options, instead of a confusing mess of
  490. booleans. Resolves ticket 8197.
  491. - Introduce a helper function to parse ExitPolicy in
  492. or_options_t structure.
  493. o Documentation:
  494. - Add a doc/TUNING document with tips for handling large numbers of
  495. TCP connections when running busy Tor relay. Update the warning
  496. message to point to this file when running out of sockets
  497. operating system is allowing to use simultaneously. Resolves
  498. ticket 9708.
  499. o Removed features:
  500. - We no longer remind the user about configuration options that have
  501. been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
  502. - Remove our old, non-weighted bandwidth-based node selection code.
  503. Previously, we used it as a fallback when we couldn't perform
  504. weighted bandwidth-based node selection. But that would only
  505. happen in the cases where we had no consensus, or when we had a
  506. consensus generated by buggy or ancient directory authorities. In
  507. either case, it's better to use the more modern, better maintained
  508. algorithm, with reasonable defaults for the weights. Closes
  509. ticket 13126.
  510. - Remove the --disable-curve25519 configure option. Relays and
  511. clients now are required to support curve25519 and the
  512. ntor handshake.
  513. - The old "StrictEntryNodes" and "StrictExitNodes" options, which
  514. used to be deprecated synonyms for "StrictNodes", are now marked
  515. obsolete. Resolves ticket 12226.
  516. - Clients don't understand the BadDirectory flag in the consensus
  517. anymore, and ignore it.
  518. o Testing:
  519. - Refactor the function that chooses guard nodes so that it can more
  520. easily be tested; write some tests for it.
  521. - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
  522. bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
  523. - Create unit tests for format_time_interval(). With bug 13393.
  524. - Add unit tests for tor_timegm signed overflow, tor_timegm and
  525. parse_rfc1123_time validity checks, correct_tm year clamping. Unit
  526. tests (visible) fixes in bug 13476.
  527. - Add a "coverage-html" make target to generate HTML-visualized
  528. coverage results when building with --enable-coverage. (Requires
  529. lcov.) Patch from Kevin Murray.
  530. - Enable the backtrace handler (where supported) when running the
  531. unit tests.
  532. - Revise all unit tests that used the legacy test_* macros to
  533. instead use the recommended tt_* macros. This patch was generated
  534. with coccinelle, to avoid manual errors. Closes ticket 13119.
  535. o Distribution (systemd):
  536. - systemd unit file: only allow tor to write to /var/lib/tor and
  537. /var/log/tor. The rest of the filesystem is accessible for reading
  538. only. Patch by intrigeri; resolves ticket 12751.
  539. - systemd unit file: ensure that the process and all its children
  540. can never gain new privileges. Patch by intrigeri; resolves
  541. ticket 12939.
  542. - systemd unit file: set up /var/run/tor as writable for the Tor
  543. service. Patch by intrigeri; resolves ticket 13196.
  544. o Removed features (directory authorities):
  545. - Remove code that prevented authorities from listing Tor relays
  546. affected by CVE-2011-2769 as guards. These relays are already
  547. rejected altogether due to the minimum version requirement of
  548. 0.2.3.16-alpha. Closes ticket 13152.
  549. - The "AuthDirRejectUnlisted" option no longer has any effect, as
  550. the fingerprints file (approved-routers) has been deprecated.
  551. - Directory authorities do not support being Naming dirauths anymore.
  552. The "NamingAuthoritativeDir" config option is now obsolete.
  553. - Directory authorities do not support giving out the BadDirectory
  554. flag anymore.
  555. - Directory authorities no longer advertise or support consensus
  556. methods 1 through 12 inclusive. These consensus methods were
  557. obsolete and/or insecure: maintaining the ability to support them
  558. served no good purpose. Implements part of proposal 215; closes
  559. ticket 10163.
  560. o Testing (test-network.sh):
  561. - Stop using "echo -n", as some shells' built-in echo doesn't
  562. support "-n". Instead, use "/bin/echo -n". Partially fixes
  563. bug 13161.
  564. - Stop an apparent test-network hang when used with make -j2. Fixes
  565. bug 13331.
  566. - Add a --delay option to test-network.sh, which configures the
  567. delay before the chutney network tests for data transmission.
  568. Partially implements ticket 13161.
  569. Changes in version 0.2.5.10 - 2014-10-24
  570. Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
  571. It adds several new security features, including improved
  572. denial-of-service resistance for relays, new compiler hardening
  573. options, and a system-call sandbox for hardened installations on Linux
  574. (requires seccomp2). The controller protocol has several new features,
  575. resolving IPv6 addresses should work better than before, and relays
  576. should be a little more CPU-efficient. We've added support for more
  577. OpenBSD and FreeBSD transparent proxy types. We've improved the build
  578. system and testing infrastructure to allow unit testing of more parts
  579. of the Tor codebase. Finally, we've addressed several nagging pluggable
  580. transport usability issues, and included numerous other small bugfixes
  581. and features mentioned below.
  582. This release marks end-of-life for Tor 0.2.3.x; those Tor versions
  583. have accumulated many known flaws; everyone should upgrade.
  584. o Deprecated versions:
  585. - Tor 0.2.3.x has reached end-of-life; it has received no patches or
  586. attention for some while.
  587. Changes in version 0.2.5.9-rc - 2014-10-20
  588. Tor 0.2.5.9-rc is the third release candidate for the Tor 0.2.5.x
  589. series. It disables SSL3 in response to the recent "POODLE" attack
  590. (even though POODLE does not affect Tor). It also works around a crash
  591. bug caused by some operating systems' response to the "POODLE" attack
  592. (which does affect Tor). It also contains a few miscellaneous fixes.
  593. o Major security fixes:
  594. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  595. today support TLS 1.0 or later, so we can safely turn off support
  596. for this old (and insecure) protocol. Fixes bug 13426.
  597. o Major bugfixes (openssl bug workaround):
  598. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  599. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  600. 13471. This is a workaround for an OpenSSL bug.
  601. o Minor bugfixes:
  602. - Disable the sandbox name resolver cache when running tor-resolve:
  603. tor-resolve doesn't use the sandbox code, and turning it on was
  604. breaking attempts to do tor-resolve on a non-default server on
  605. Linux. Fixes bug 13295; bugfix on 0.2.5.3-alpha.
  606. o Compilation fixes:
  607. - Build and run correctly on systems like OpenBSD-current that have
  608. patched OpenSSL to remove get_cipher_by_char and/or its
  609. implementations. Fixes issue 13325.
  610. o Downgraded warnings:
  611. - Downgrade the severity of the 'unexpected sendme cell from client'
  612. from 'warn' to 'protocol warning'. Closes ticket 8093.
  613. Changes in version 0.2.4.25 - 2014-10-20
  614. Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
  615. (even though POODLE does not affect Tor). It also works around a crash
  616. bug caused by some operating systems' response to the "POODLE" attack
  617. (which does affect Tor).
  618. o Major security fixes (also in 0.2.5.9-rc):
  619. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  620. today support TLS 1.0 or later, so we can safely turn off support
  621. for this old (and insecure) protocol. Fixes bug 13426.
  622. o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
  623. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  624. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  625. 13471. This is a workaround for an OpenSSL bug.
  626. Changes in version 0.2.5.8-rc - 2014-09-22
  627. Tor 0.2.5.8-rc is the second release candidate for the Tor 0.2.5.x
  628. series. It fixes a bug that affects consistency and speed when
  629. connecting to hidden services, and it updates the location of one of
  630. the directory authorities.
  631. o Major bugfixes:
  632. - Clients now send the correct address for their chosen rendezvous
  633. point when trying to access a hidden service. They used to send
  634. the wrong address, which would still work some of the time because
  635. they also sent the identity digest of the rendezvous point, and if
  636. the hidden service happened to try connecting to the rendezvous
  637. point from a relay that already had a connection open to it,
  638. the relay would reuse that connection. Now connections to hidden
  639. services should be more robust and faster. Also, this bug meant
  640. that clients were leaking to the hidden service whether they were
  641. on a little-endian (common) or big-endian (rare) system, which for
  642. some users might have reduced their anonymity. Fixes bug 13151;
  643. bugfix on 0.2.1.5-alpha.
  644. o Directory authority changes:
  645. - Change IP address for gabelmoo (v3 directory authority).
  646. Changes in version 0.2.4.24 - 2014-09-22
  647. Tor 0.2.4.24 fixes a bug that affects consistency and speed when
  648. connecting to hidden services, and it updates the location of one of
  649. the directory authorities.
  650. o Major bugfixes:
  651. - Clients now send the correct address for their chosen rendezvous
  652. point when trying to access a hidden service. They used to send
  653. the wrong address, which would still work some of the time because
  654. they also sent the identity digest of the rendezvous point, and if
  655. the hidden service happened to try connecting to the rendezvous
  656. point from a relay that already had a connection open to it,
  657. the relay would reuse that connection. Now connections to hidden
  658. services should be more robust and faster. Also, this bug meant
  659. that clients were leaking to the hidden service whether they were
  660. on a little-endian (common) or big-endian (rare) system, which for
  661. some users might have reduced their anonymity. Fixes bug 13151;
  662. bugfix on 0.2.1.5-alpha.
  663. o Directory authority changes:
  664. - Change IP address for gabelmoo (v3 directory authority).
  665. o Minor features (geoip):
  666. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  667. Country database.
  668. Changes in version 0.2.5.7-rc - 2014-09-11
  669. Tor 0.2.5.7-rc fixes several regressions from earlier in the 0.2.5.x
  670. release series, and some long-standing bugs related to ORPort reachability
  671. testing and failure to send CREATE cells. It is the first release
  672. candidate for the Tor 0.2.5.x series.
  673. o Major bugfixes (client, startup):
  674. - Start making circuits as soon as DisabledNetwork is turned off.
  675. When Tor started with DisabledNetwork set, it would correctly
  676. conclude that it shouldn't build circuits, but it would mistakenly
  677. cache this conclusion, and continue believing it even when
  678. DisableNetwork is set to 0. Fixes the bug introduced by the fix
  679. for bug 11200; bugfix on 0.2.5.4-alpha.
  680. - Resume expanding abbreviations for command-line options. The fix
  681. for bug 4647 accidentally removed our hack from bug 586 that
  682. rewrote HashedControlPassword to __HashedControlSessionPassword
  683. when it appears on the commandline (which allowed the user to set
  684. her own HashedControlPassword in the torrc file while the
  685. controller generates a fresh session password for each run). Fixes
  686. bug 12948; bugfix on 0.2.5.1-alpha.
  687. - Warn about attempts to run hidden services and relays in the same
  688. process: that's probably not a good idea. Closes ticket 12908.
  689. o Major bugfixes (relay):
  690. - Avoid queuing or sending destroy cells for circuit ID zero when we
  691. fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
  692. Found and fixed by "cypherpunks".
  693. - Fix ORPort reachability detection on relays running behind a
  694. proxy, by correctly updating the "local" mark on the controlling
  695. channel when changing the address of an or_connection_t after the
  696. handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
  697. o Minor features (bridge):
  698. - Add an ExtORPortCookieAuthFileGroupReadable option to make the
  699. cookie file for the ExtORPort g+r by default.
  700. o Minor features (geoip):
  701. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  702. Country database.
  703. o Minor bugfixes (logging):
  704. - Reduce the log severity of the "Pluggable transport proxy does not
  705. provide any needed transports and will not be launched." message,
  706. since Tor Browser includes several ClientTransportPlugin lines in
  707. its torrc-defaults file, leading every Tor Browser user who looks
  708. at her logs to see these notices and wonder if they're dangerous.
  709. Resolves bug 13124; bugfix on 0.2.5.3-alpha.
  710. - Downgrade "Unexpected onionskin length after decryption" warning
  711. to a protocol-warn, since there's nothing relay operators can do
  712. about a client that sends them a malformed create cell. Resolves
  713. bug 12996; bugfix on 0.0.6rc1.
  714. - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
  715. cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
  716. - When logging information about an EXTEND2 or EXTENDED2 cell, log
  717. their names correctly. Fixes part of bug 12700; bugfix
  718. on 0.2.4.8-alpha.
  719. - When logging information about a relay cell whose command we don't
  720. recognize, log its command as an integer. Fixes part of bug 12700;
  721. bugfix on 0.2.1.10-alpha.
  722. - Escape all strings from the directory connection before logging
  723. them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
  724. o Minor bugfixes (controller):
  725. - Restore the functionality of CookieAuthFileGroupReadable. Fixes
  726. bug 12864; bugfix on 0.2.5.1-alpha.
  727. - Actually send TRANSPORT_LAUNCHED and HS_DESC events to
  728. controllers. Fixes bug 13085; bugfix on 0.2.5.1-alpha. Patch
  729. by "teor".
  730. o Minor bugfixes (compilation):
  731. - Fix compilation of test.h with MSVC. Patch from Gisle Vanem;
  732. bugfix on 0.2.5.5-alpha.
  733. - Make the nmake make files work again. Fixes bug 13081. Bugfix on
  734. 0.2.5.1-alpha. Patch from "NewEraCracker".
  735. - In routerlist_assert_ok(), don't take the address of a
  736. routerinfo's cache_info member unless that routerinfo is non-NULL.
  737. Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
  738. - Fix a large number of false positive warnings from the clang
  739. analyzer static analysis tool. This should make real warnings
  740. easier for clang analyzer to find. Patch from "teor". Closes
  741. ticket 13036.
  742. o Distribution (systemd):
  743. - Verify configuration file via ExecStartPre in the systemd unit
  744. file. Patch from intrigeri; resolves ticket 12730.
  745. - Explicitly disable RunAsDaemon in the systemd unit file. Our
  746. current systemd unit uses "Type = simple", so systemd does not
  747. expect tor to fork. If the user has "RunAsDaemon 1" in their
  748. torrc, then things won't work as expected. This is e.g. the case
  749. on Debian (and derivatives), since there we pass "--defaults-torrc
  750. /usr/share/tor/tor-service-defaults-torrc" (that contains
  751. "RunAsDaemon 1") by default. Patch by intrigeri; resolves
  752. ticket 12731.
  753. o Documentation:
  754. - Adjust the URLs in the README to refer to the new locations of
  755. several documents on the website. Fixes bug 12830. Patch from
  756. Matt Pagan.
  757. - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
  758. ticket 12878.
  759. Changes in version 0.2.5.6-alpha - 2014-07-28
  760. Tor 0.2.5.6-alpha brings us a big step closer to slowing down the
  761. risk from guard rotation, and fixes a variety of other issues to get
  762. us closer to a release candidate.
  763. o Major features (also in 0.2.4.23):
  764. - Make the number of entry guards configurable via a new
  765. NumEntryGuards consensus parameter, and the number of directory
  766. guards configurable via a new NumDirectoryGuards consensus
  767. parameter. Implements ticket 12688.
  768. o Major bugfixes (also in 0.2.4.23):
  769. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  770. implementation that caused incorrect results on 32-bit
  771. implementations when certain malformed inputs were used along with
  772. a small class of private ntor keys. This bug does not currently
  773. appear to allow an attacker to learn private keys or impersonate a
  774. Tor server, but it could provide a means to distinguish 32-bit Tor
  775. implementations from 64-bit Tor implementations. Fixes bug 12694;
  776. bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
  777. Adam Langley.
  778. o Major bugfixes:
  779. - Perform circuit cleanup operations even when circuit
  780. construction operations are disabled (because the network is
  781. disabled, or because there isn't enough directory information).
  782. Previously, when we were not building predictive circuits, we
  783. were not closing expired circuits either. Fixes bug 8387; bugfix on
  784. 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
  785. became more strict about when we have "enough directory information
  786. to build circuits".
  787. o Minor features:
  788. - Authorities now assign the Guard flag to the fastest 25% of the
  789. network (it used to be the fastest 50%). Also raise the consensus
  790. weight that guarantees the Guard flag from 250 to 2000. For the
  791. current network, this results in about 1100 guards, down from 2500.
  792. This step paves the way for moving the number of entry guards
  793. down to 1 (proposal 236) while still providing reasonable expected
  794. performance for most users. Implements ticket 12690.
  795. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  796. Country database.
  797. - Slightly enhance the diagnostic message for bug 12184.
  798. o Minor bugfixes (also in 0.2.4.23):
  799. - Warn and drop the circuit if we receive an inbound 'relay early'
  800. cell. Those used to be normal to receive on hidden service circuits
  801. due to bug 1038, but the buggy Tor versions are long gone from
  802. the network so we can afford to resume watching for them. Resolves
  803. the rest of bug 1038; bugfix on 0.2.1.19.
  804. - Correct a confusing error message when trying to extend a circuit
  805. via the control protocol but we don't know a descriptor or
  806. microdescriptor for one of the specified relays. Fixes bug 12718;
  807. bugfix on 0.2.3.1-alpha.
  808. o Minor bugfixes:
  809. - Fix compilation when building with bufferevents enabled. (This
  810. configuration is still not expected to work, however.)
  811. Fixes bugs 12438, 12474, 11578; bugfixes on 0.2.5.1-alpha and
  812. 0.2.5.3-alpha. Patches from Anthony G. Basile and Sathyanarayanan
  813. Gunasekaran.
  814. - Compile correctly with builds and forks of OpenSSL (such as
  815. LibreSSL) that disable compression. Fixes bug 12602; bugfix on
  816. 0.2.1.1-alpha. Patch from "dhill".
  817. Changes in version 0.2.4.23 - 2014-07-28
  818. Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
  819. guard rotation, and also backports several important fixes from the
  820. Tor 0.2.5 alpha release series.
  821. o Major features:
  822. - Clients now look at the "usecreatefast" consensus parameter to
  823. decide whether to use CREATE_FAST or CREATE cells for the first hop
  824. of their circuit. This approach can improve security on connections
  825. where Tor's circuit handshake is stronger than the available TLS
  826. connection security levels, but the tradeoff is more computational
  827. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  828. - Make the number of entry guards configurable via a new
  829. NumEntryGuards consensus parameter, and the number of directory
  830. guards configurable via a new NumDirectoryGuards consensus
  831. parameter. Implements ticket 12688.
  832. o Major bugfixes:
  833. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  834. implementation that caused incorrect results on 32-bit
  835. implementations when certain malformed inputs were used along with
  836. a small class of private ntor keys. This bug does not currently
  837. appear to allow an attacker to learn private keys or impersonate a
  838. Tor server, but it could provide a means to distinguish 32-bit Tor
  839. implementations from 64-bit Tor implementations. Fixes bug 12694;
  840. bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
  841. Adam Langley.
  842. o Minor bugfixes:
  843. - Warn and drop the circuit if we receive an inbound 'relay early'
  844. cell. Those used to be normal to receive on hidden service circuits
  845. due to bug 1038, but the buggy Tor versions are long gone from
  846. the network so we can afford to resume watching for them. Resolves
  847. the rest of bug 1038; bugfix on 0.2.1.19.
  848. - Correct a confusing error message when trying to extend a circuit
  849. via the control protocol but we don't know a descriptor or
  850. microdescriptor for one of the specified relays. Fixes bug 12718;
  851. bugfix on 0.2.3.1-alpha.
  852. - Avoid an illegal read from stack when initializing the TLS
  853. module using a version of OpenSSL without all of the ciphers
  854. used by the v2 link handshake. Fixes bug 12227; bugfix on
  855. 0.2.4.8-alpha. Found by "starlight".
  856. o Minor features:
  857. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  858. Country database.
  859. Changes in version 0.2.5.5-alpha - 2014-06-18
  860. Tor 0.2.5.5-alpha fixes a wide variety of remaining issues in the Tor
  861. 0.2.5.x release series, including a couple of DoS issues, some
  862. performance regressions, a large number of bugs affecting the Linux
  863. seccomp2 sandbox code, and various other bugfixes. It also adds
  864. diagnostic bugfixes for a few tricky issues that we're trying to
  865. track down.
  866. o Major features (security, traffic analysis resistance):
  867. - Several major improvements to the algorithm used to decide when to
  868. close TLS connections. Previous versions of Tor closed connections
  869. at a fixed interval after the last time a non-padding cell was
  870. sent over the connection, regardless of the target of the
  871. connection. Now, we randomize the intervals by adding up to 50% of
  872. their base value, we measure the length of time since connection
  873. last had at least one circuit, and we allow connections to known
  874. ORs to remain open a little longer (15 minutes instead of 3
  875. minutes minimum). These changes should improve Tor's resistance
  876. against some kinds of traffic analysis, and lower some overhead
  877. from needlessly closed connections. Fixes ticket 6799.
  878. Incidentally fixes ticket 12023; bugfix on 0.2.5.1-alpha.
  879. o Major bugfixes (security, OOM, new since 0.2.5.4-alpha, also in 0.2.4.22):
  880. - Fix a memory leak that could occur if a microdescriptor parse
  881. fails during the tokenizing step. This bug could enable a memory
  882. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  883. on 0.2.2.6-alpha.
  884. o Major bugfixes (security, directory authorities):
  885. - Directory authorities now include a digest of each relay's
  886. identity key as a part of its microdescriptor.
  887. This is a workaround for bug 11743 (reported by "cypherpunks"),
  888. where Tor clients do not support receiving multiple
  889. microdescriptors with the same SHA256 digest in the same
  890. consensus. When clients receive a consensus like this, they only
  891. use one of the relays. Without this fix, a hostile relay could
  892. selectively disable some client use of target relays by
  893. constructing a router descriptor with a different identity and the
  894. same microdescriptor parameters and getting the authorities to
  895. list it in a microdescriptor consensus. This fix prevents an
  896. attacker from causing a microdescriptor collision, because the
  897. router's identity is not forgeable.
  898. o Major bugfixes (relay):
  899. - Use a direct dirport connection when uploading non-anonymous
  900. descriptors to the directory authorities. Previously, relays would
  901. incorrectly use tunnel connections under a fairly wide variety of
  902. circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
  903. - When a circuit accidentally has the same circuit ID for its
  904. forward and reverse direction, correctly detect the direction of
  905. cells using that circuit. Previously, this bug made roughly one
  906. circuit in a million non-functional. Fixes bug 12195; this is a
  907. bugfix on every version of Tor.
  908. o Major bugfixes (client, pluggable transports):
  909. - When managing pluggable transports, use OS notification facilities
  910. to learn if they have crashed, and don't attempt to kill any
  911. process that has already exited. Fixes bug 8746; bugfix
  912. on 0.2.3.6-alpha.
  913. o Minor features (diagnostic):
  914. - When logging a warning because of bug 7164, additionally check the
  915. hash table for consistency (as proposed on ticket 11737). This may
  916. help diagnose bug 7164.
  917. - When we log a heartbeat, log how many one-hop circuits we have
  918. that are at least 30 minutes old, and log status information about
  919. a few of them. This is an attempt to track down bug 8387.
  920. - When encountering an unexpected CR while writing text to a file on
  921. Windows, log the name of the file. Should help diagnosing
  922. bug 11233.
  923. - Give more specific warnings when a client notices that an onion
  924. handshake has failed. Fixes ticket 9635.
  925. - Add significant new logging code to attempt to diagnose bug 12184,
  926. where relays seem to run out of available circuit IDs.
  927. - Improve the diagnostic log message for bug 8387 even further to
  928. try to improve our odds of figuring out why one-hop directory
  929. circuits sometimes do not get closed.
  930. o Minor features (security, memory management):
  931. - Memory allocation tricks (mempools and buffer freelists) are now
  932. disabled by default. You can turn them back on with
  933. --enable-mempools and --enable-buf-freelists respectively. We're
  934. disabling these features because malloc performance is good enough
  935. on most platforms, and a similar feature in OpenSSL exacerbated
  936. exploitation of the Heartbleed attack. Resolves ticket 11476.
  937. o Minor features (security):
  938. - Apply the secure SipHash-2-4 function to the hash table mapping
  939. circuit IDs and channels to circuits. We missed this one when we
  940. were converting all the other hash functions to use SipHash back
  941. in 0.2.5.3-alpha. Resolves ticket 11750.
  942. o Minor features (build):
  943. - The configure script has a --disable-seccomp option to turn off
  944. support for libseccomp on systems that have it, in case it (or
  945. Tor's use of it) is broken. Resolves ticket 11628.
  946. o Minor features (other):
  947. - Update geoip and geoip6 to the June 4 2014 Maxmind GeoLite2
  948. Country database.
  949. o Minor bugfixes (security, new since 0.2.5.4-alpha, also in 0.2.4.22):
  950. - When running a hidden service, do not allow TunneledDirConns 0;
  951. this will keep the hidden service from running, and also
  952. make it publish its descriptors directly over HTTP. Fixes bug 10849;
  953. bugfix on 0.2.1.1-alpha.
  954. o Minor bugfixes (performance):
  955. - Avoid a bug where every successful connection made us recompute
  956. the flag telling us whether we have sufficient information to
  957. build circuits. Previously, we would forget our cached value
  958. whenever we successfully opened a channel (or marked a router as
  959. running or not running for any other reason), regardless of
  960. whether we had previously believed the router to be running. This
  961. forced us to run an expensive update operation far too often.
  962. Fixes bug 12170; bugfix on 0.1.2.1-alpha.
  963. - Avoid using tor_memeq() for checking relay cell integrity. This
  964. removes a possible performance bottleneck. Fixes part of bug
  965. 12169; bugfix on 0.2.1.31.
  966. o Minor bugfixes (compilation):
  967. - Fix compilation of test_status.c when building with MVSC. Bugfix
  968. on 0.2.5.4-alpha. Patch from Gisle Vanem.
  969. - Resolve GCC complaints on OpenBSD about discarding constness in
  970. TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
  971. on 0.1.1.23. Patch from Dana Koch.
  972. - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
  973. treatment of long and time_t as comparable types. Fixes part of
  974. bug 11633. Patch from Dana Koch.
  975. - Make Tor compile correctly with --disable-buf-freelists. Fixes bug
  976. 11623; bugfix on 0.2.5.3-alpha.
  977. - When deciding whether to build the 64-bit curve25519
  978. implementation, detect platforms where we can compile 128-bit
  979. arithmetic but cannot link it. Fixes bug 11729; bugfix on
  980. 0.2.4.8-alpha. Patch from "conradev".
  981. - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
  982. bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
  983. - Fix compilation with dmalloc. Fixes bug 11605; bugfix
  984. on 0.2.4.10-alpha.
  985. o Minor bugfixes (Directory server):
  986. - When sending a compressed set of descriptors or microdescriptors,
  987. make sure to finalize the zlib stream. Previously, we would write
  988. all the compressed data, but if the last descriptor we wanted to
  989. send was missing or too old, we would not mark the stream as
  990. finished. This caused problems for decompression tools. Fixes bug
  991. 11648; bugfix on 0.1.1.23.
  992. o Minor bugfixes (Linux seccomp sandbox):
  993. - Make the seccomp sandbox code compile under ARM Linux. Fixes bug
  994. 11622; bugfix on 0.2.5.1-alpha.
  995. - Avoid crashing when re-opening listener ports with the seccomp
  996. sandbox active. Fixes bug 12115; bugfix on 0.2.5.1-alpha.
  997. - Avoid crashing with the seccomp sandbox enabled along with
  998. ConstrainedSockets. Fixes bug 12139; bugfix on 0.2.5.1-alpha.
  999. - When we receive a SIGHUP with the sandbox enabled, correctly
  1000. support rotating our log files. Fixes bug 12032; bugfix
  1001. on 0.2.5.1-alpha.
  1002. - Avoid crash when running with sandboxing enabled and
  1003. DirReqStatistics not disabled. Fixes bug 12035; bugfix
  1004. on 0.2.5.1-alpha.
  1005. - Fix a "BUG" warning when trying to write bridge-stats files with
  1006. the Linux syscall sandbox filter enabled. Fixes bug 12041; bugfix
  1007. on 0.2.5.1-alpha.
  1008. - Prevent the sandbox from crashing on startup when run with the
  1009. --enable-expensive-hardening configuration option. Fixes bug
  1010. 11477; bugfix on 0.2.5.4-alpha.
  1011. - When running with DirPortFrontPage and sandboxing both enabled,
  1012. reload the DirPortFrontPage correctly when restarting. Fixes bug
  1013. 12028; bugfix on 0.2.5.1-alpha.
  1014. - Don't try to enable the sandbox when using the Tor binary to check
  1015. its configuration, hash a passphrase, or so on. Doing so was
  1016. crashing on startup for some users. Fixes bug 11609; bugfix
  1017. on 0.2.5.1-alpha.
  1018. - Avoid warnings when running with sandboxing and node statistics
  1019. enabled at the same time. Fixes part of 12064; bugfix on
  1020. 0.2.5.1-alpha. Patch from Michael Wolf.
  1021. - Avoid warnings when running with sandboxing enabled at the same
  1022. time as cookie authentication, hidden services, or directory
  1023. authority voting. Fixes part of 12064; bugfix on 0.2.5.1-alpha.
  1024. - Do not allow options that require calls to exec to be enabled
  1025. alongside the seccomp2 sandbox: they will inevitably crash. Fixes
  1026. bug 12043; bugfix on 0.2.5.1-alpha.
  1027. - Handle failures in getpwnam()/getpwuid() when running with the
  1028. User option set and the Linux syscall sandbox enabled. Fixes bug
  1029. 11946; bugfix on 0.2.5.1-alpha.
  1030. - Refactor the getaddrinfo workaround that the seccomp sandbox uses
  1031. to avoid calling getaddrinfo() after installing the sandbox
  1032. filters. Previously, it preloaded a cache with the IPv4 address
  1033. for our hostname, and nothing else. Now, it loads the cache with
  1034. every address that it used to initialize the Tor process. Fixes
  1035. bug 11970; bugfix on 0.2.5.1-alpha.
  1036. o Minor bugfixes (pluggable transports):
  1037. - Enable the ExtORPortCookieAuthFile option, to allow changing the
  1038. default location of the authentication token for the extended OR
  1039. Port as used by sever-side pluggable transports. We had
  1040. implemented this option before, but the code to make it settable
  1041. had been omitted. Fixes bug 11635; bugfix on 0.2.5.1-alpha.
  1042. - Avoid another 60-second delay when starting Tor in a pluggable-
  1043. transport-using configuration when we already have cached
  1044. descriptors for our bridges. Fixes bug 11965; bugfix
  1045. on 0.2.3.6-alpha.
  1046. o Minor bugfixes (client):
  1047. - Avoid "Tried to open a socket with DisableNetwork set" warnings
  1048. when starting a client with bridges configured and DisableNetwork
  1049. set. (Tor launcher starts Tor with DisableNetwork set the first
  1050. time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
  1051. o Minor bugfixes (testing):
  1052. - The Python parts of the test scripts now work on Python 3 as well
  1053. as Python 2, so systems where '/usr/bin/python' is Python 3 will
  1054. no longer have the tests break. Fixes bug 11608; bugfix
  1055. on 0.2.5.2-alpha.
  1056. - When looking for versions of python that we could run the tests
  1057. with, check for "python2.7" and "python3.3"; previously we were
  1058. only looking for "python", "python2", and "python3". Patch from
  1059. Dana Koch. Fixes bug 11632; bugfix on 0.2.5.2-alpha.
  1060. - Fix all valgrind warnings produced by the unit tests. There were
  1061. over a thousand memory leak warnings previously, mostly produced
  1062. by forgetting to free things in the unit test code. Fixes bug
  1063. 11618, bugfixes on many versions of Tor.
  1064. o Minor bugfixes (tor-fw-helper):
  1065. - Give a correct log message when tor-fw-helper fails to launch.
  1066. (Previously, we would say something like "tor-fw-helper sent us a
  1067. string we could not parse".) Fixes bug 9781; bugfix
  1068. on 0.2.4.2-alpha.
  1069. o Minor bugfixes (relay, threading):
  1070. - Check return code on spawn_func() in cpuworker code, so that we
  1071. don't think we've spawned a nonworking cpuworker and write junk to
  1072. it forever. Fix related to bug 4345; bugfix on all released Tor
  1073. versions. Found by "skruffy".
  1074. - Use a pthread_attr to make sure that spawn_func() cannot return an
  1075. error while at the same time launching a thread. Fix related to
  1076. bug 4345; bugfix on all released Tor versions. Reported
  1077. by "cypherpunks".
  1078. o Minor bugfixes (relay, oom prevention):
  1079. - Correctly detect the total available system memory. We tried to do
  1080. this in 0.2.5.4-alpha, but the code was set up to always return an
  1081. error value, even on success. Fixes bug 11805; bugfix
  1082. on 0.2.5.4-alpha.
  1083. o Minor bugfixes (relay, other):
  1084. - We now drop CREATE cells for already-existent circuit IDs and for
  1085. zero-valued circuit IDs, regardless of other factors that might
  1086. otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
  1087. on 0.0.8pre1.
  1088. - Avoid an illegal read from stack when initializing the TLS module
  1089. using a version of OpenSSL without all of the ciphers used by the
  1090. v2 link handshake. Fixes bug 12227; bugfix on 0.2.4.8-alpha. Found
  1091. by "starlight".
  1092. - When rejecting DATA cells for stream_id zero, still count them
  1093. against the circuit's deliver window so that we don't fail to send
  1094. a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
  1095. o Minor bugfixes (logging):
  1096. - Fix a misformatted log message about delayed directory fetches.
  1097. Fixes bug 11654; bugfix on 0.2.5.3-alpha.
  1098. - Squelch a spurious LD_BUG message "No origin circuit for
  1099. successful SOCKS stream" in certain hidden service failure cases;
  1100. fixes bug 10616.
  1101. o Distribution:
  1102. - Include a tor.service file in contrib/dist for use with systemd.
  1103. Some distributions will be able to use this file unmodified;
  1104. others will need to tweak it, or write their own. Patch from Jamie
  1105. Nguyen; resolves ticket 8368.
  1106. o Documentation:
  1107. - Clean up several option names in the manpage to match their real
  1108. names, add the missing documentation for a couple of testing and
  1109. directory authority options, remove the documentation for a
  1110. V2-directory fetching option that no longer exists. Resolves
  1111. ticket 11634.
  1112. - Correct the documenation so that it lists the correct directory
  1113. for the stats files. (They are in a subdirectory called "stats",
  1114. not "status".)
  1115. - In the manpage, move more authority-only options into the
  1116. directory authority section so that operators of regular directory
  1117. caches don't get confused.
  1118. o Package cleanup:
  1119. - The contrib directory has been sorted and tidied. Before, it was
  1120. an unsorted dumping ground for useful and not-so-useful things.
  1121. Now, it is divided based on functionality, and the items which
  1122. seemed to be nonfunctional or useless have been removed. Resolves
  1123. ticket 8966; based on patches from "rl1987".
  1124. o Removed code:
  1125. - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
  1126. and MTBF calculations, but that nobody was using. Fixes #11742.
  1127. - The TunnelDirConns and PreferTunnelledDirConns options no longer
  1128. exist; tunneled directory connections have been available since
  1129. 0.1.2.5-alpha, and turning them off is not a good idea. This is a
  1130. brute-force fix for 10849, where "TunnelDirConns 0" would break
  1131. hidden services.
  1132. Changes in version 0.2.4.22 - 2014-05-16
  1133. Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
  1134. alpha release series. These include blocking all authority signing
  1135. keys that may have been affected by the OpenSSL "heartbleed" bug,
  1136. choosing a far more secure set of TLS ciphersuites by default, closing
  1137. a couple of memory leaks that could be used to run a target relay out
  1138. of RAM, and several others.
  1139. o Major features (security, backport from 0.2.5.4-alpha):
  1140. - Block authority signing keys that were used on authorities
  1141. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  1142. don't have any evidence that these keys _were_ compromised; we're
  1143. doing this to be prudent.) Resolves ticket 11464.
  1144. o Major bugfixes (security, OOM):
  1145. - Fix a memory leak that could occur if a microdescriptor parse
  1146. fails during the tokenizing step. This bug could enable a memory
  1147. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  1148. on 0.2.2.6-alpha.
  1149. o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
  1150. - The relay ciphersuite list is now generated automatically based on
  1151. uniform criteria, and includes all OpenSSL ciphersuites with
  1152. acceptable strength and forward secrecy. Previously, we had left
  1153. some perfectly fine ciphersuites unsupported due to omission or
  1154. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  1155. 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
  1156. - Relays now trust themselves to have a better view than clients of
  1157. which TLS ciphersuites are better than others. (Thanks to bug
  1158. 11513, the relay list is now well-considered, whereas the client
  1159. list has been chosen mainly for anti-fingerprinting purposes.)
  1160. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  1161. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  1162. AES128. Resolves ticket 11528.
  1163. - Clients now try to advertise the same list of ciphersuites as
  1164. Firefox 28. This change enables selection of (fast) GCM
  1165. ciphersuites, disables some strange old ciphers, and stops
  1166. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  1167. Resolves ticket 11438.
  1168. o Minor bugfixes (configuration, security):
  1169. - When running a hidden service, do not allow TunneledDirConns 0:
  1170. trying to set that option together with a hidden service would
  1171. otherwise prevent the hidden service from running, and also make
  1172. it publish its descriptors directly over HTTP. Fixes bug 10849;
  1173. bugfix on 0.2.1.1-alpha.
  1174. o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
  1175. - Avoid sending a garbage value to the controller when a circuit is
  1176. cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
  1177. o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
  1178. - Stop leaking memory when we successfully resolve a PTR record.
  1179. Fixes bug 11437; bugfix on 0.2.4.7-alpha.
  1180. o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
  1181. - Avoid 60-second delays in the bootstrapping process when Tor is
  1182. launching for a second time while using bridges. Fixes bug 9229;
  1183. bugfix on 0.2.0.3-alpha.
  1184. o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
  1185. - Give the correct URL in the warning message when trying to run a
  1186. relay on an ancient version of Windows. Fixes bug 9393.
  1187. o Minor bugfixes (compilation):
  1188. - Fix a compilation error when compiling with --disable-curve25519.
  1189. Fixes bug 9700; bugfix on 0.2.4.17-rc.
  1190. o Minor bugfixes:
  1191. - Downgrade the warning severity for the the "md was still
  1192. referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
  1193. for trying to diagnose this bug, and the current warning in
  1194. earlier versions of tor achieves nothing useful. Addresses warning
  1195. from bug 7164.
  1196. o Minor features (log verbosity, backport from 0.2.5.4-alpha):
  1197. - When we run out of usable circuit IDs on a channel, log only one
  1198. warning for the whole channel, and describe how many circuits
  1199. there were on the channel. Fixes part of ticket 11553.
  1200. o Minor features (security, backport from 0.2.5.4-alpha):
  1201. - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
  1202. leave the default at 8GBytes), to better support Raspberry Pi
  1203. users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
  1204. o Documentation (backport from 0.2.5.4-alpha):
  1205. - Correctly document that we search for a system torrc file before
  1206. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  1207. 0.2.3.18-rc.
  1208. Changes in version 0.2.5.4-alpha - 2014-04-25
  1209. Tor 0.2.5.4-alpha includes several security and performance
  1210. improvements for clients and relays, including blacklisting authority
  1211. signing keys that were used while susceptible to the OpenSSL
  1212. "heartbleed" bug, fixing two expensive functions on busy relays,
  1213. improved TLS ciphersuite preference lists, support for run-time
  1214. hardening on compilers that support AddressSanitizer, and more work on
  1215. the Linux sandbox code.
  1216. There are also several usability fixes for clients (especially clients
  1217. that use bridges), two new TransPort protocols supported (one on
  1218. OpenBSD, one on FreeBSD), and various other bugfixes.
  1219. This release marks end-of-life for Tor 0.2.2.x; those Tor versions
  1220. have accumulated many known flaws; everyone should upgrade.
  1221. o Major features (security):
  1222. - If you don't specify MaxMemInQueues yourself, Tor now tries to
  1223. pick a good value based on your total system memory. Previously,
  1224. the default was always 8 GB. You can still override the default by
  1225. setting MaxMemInQueues yourself. Resolves ticket 11396.
  1226. - Block authority signing keys that were used on authorities
  1227. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  1228. don't have any evidence that these keys _were_ compromised; we're
  1229. doing this to be prudent.) Resolves ticket 11464.
  1230. o Major features (relay performance):
  1231. - Speed up server-side lookups of rendezvous and introduction point
  1232. circuits by using hashtables instead of linear searches. These
  1233. functions previously accounted between 3 and 7% of CPU usage on
  1234. some busy relays. Resolves ticket 9841.
  1235. - Avoid wasting CPU when extending a circuit over a channel that is
  1236. nearly out of circuit IDs. Previously, we would do a linear scan
  1237. over possible circuit IDs before finding one or deciding that we
  1238. had exhausted our possibilities. Now, we try at most 64 random
  1239. circuit IDs before deciding that we probably won't succeed. Fixes
  1240. a possible root cause of ticket 11553.
  1241. o Major features (seccomp2 sandbox, Linux only):
  1242. - The seccomp2 sandbox can now run a test network for multiple hours
  1243. without crashing. The sandbox is still experimental, and more bugs
  1244. will probably turn up. To try it, enable "Sandbox 1" on a Linux
  1245. host. Resolves ticket 11351.
  1246. - Strengthen sandbox code: the sandbox can now test the arguments
  1247. for rename(), and blocks _sysctl() entirely. Resolves another part
  1248. of ticket 11351.
  1249. - When the sandbox blocks a system call, it now tries to log a stack
  1250. trace before exiting. Resolves ticket 11465.
  1251. o Major bugfixes (TLS cipher selection):
  1252. - The relay ciphersuite list is now generated automatically based on
  1253. uniform criteria, and includes all OpenSSL ciphersuites with
  1254. acceptable strength and forward secrecy. Previously, we had left
  1255. some perfectly fine ciphersuites unsupported due to omission or
  1256. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  1257. 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
  1258. - Relays now trust themselves to have a better view than clients of
  1259. which TLS ciphersuites are better than others. (Thanks to bug
  1260. 11513, the relay list is now well-considered, whereas the client
  1261. list has been chosen mainly for anti-fingerprinting purposes.)
  1262. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  1263. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  1264. AES128. Resolves ticket 11528.
  1265. - Clients now try to advertise the same list of ciphersuites as
  1266. Firefox 28. This change enables selection of (fast) GCM
  1267. ciphersuites, disables some strange old ciphers, and stops
  1268. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  1269. Resolves ticket 11438.
  1270. o Major bugfixes (bridge client):
  1271. - Avoid 60-second delays in the bootstrapping process when Tor is
  1272. launching for a second time while using bridges. Fixes bug 9229;
  1273. bugfix on 0.2.0.3-alpha.
  1274. o Minor features (transparent proxy, *BSD):
  1275. - Support FreeBSD's ipfw firewall interface for TransPort ports on
  1276. FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
  1277. 10267; patch from "yurivict".
  1278. - Support OpenBSD's divert-to rules with the pf firewall for
  1279. transparent proxy ports. To enable it, set "TransProxyType
  1280. pf-divert". This allows Tor to run a TransPort transparent proxy
  1281. port on OpenBSD 4.4 or later without root privileges. See the
  1282. pf.conf(5) manual page for information on configuring pf to use
  1283. divert-to rules. Closes ticket 10896; patch from Dana Koch.
  1284. o Minor features (security):
  1285. - New --enable-expensive-hardening option to enable security
  1286. hardening options that consume nontrivial amounts of CPU and
  1287. memory. Right now, this includes AddressSanitizer and UbSan, which
  1288. are supported in newer versions of GCC and Clang. Closes ticket
  1289. 11477.
  1290. o Minor features (log verbosity):
  1291. - Demote the message that we give when a flushing connection times
  1292. out for too long from NOTICE to INFO. It was usually meaningless.
  1293. Resolves ticket 5286.
  1294. - Don't log so many notice-level bootstrapping messages at startup
  1295. about downloading descriptors. Previously, we'd log a notice
  1296. whenever we learned about more routers. Now, we only log a notice
  1297. at every 5% of progress. Fixes bug 9963.
  1298. - Warn less verbosely when receiving a malformed
  1299. ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
  1300. - When we run out of usable circuit IDs on a channel, log only one
  1301. warning for the whole channel, and describe how many circuits
  1302. there were on the channel. Fixes part of ticket 11553.
  1303. o Minor features (relay):
  1304. - If a circuit timed out for at least 3 minutes, check if we have a
  1305. new external IP address, and publish a new descriptor with the new
  1306. IP address if it changed. Resolves ticket 2454.
  1307. o Minor features (controller):
  1308. - Make the entire exit policy available from the control port via
  1309. GETINFO exit-policy/*. Implements enhancement 7952. Patch from
  1310. "rl1987".
  1311. - Because of the fix for ticket 11396, the real limit for memory
  1312. usage may no longer match the configured MaxMemInQueues value. The
  1313. real limit is now exposed via GETINFO limits/max-mem-in-queues.
  1314. o Minor features (bridge client):
  1315. - Report a more useful failure message when we can't connect to a
  1316. bridge because we don't have the right pluggable transport
  1317. configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
  1318. o Minor features (diagnostic):
  1319. - Add more log messages to diagnose bug 7164, which causes
  1320. intermittent "microdesc_free() called but md was still referenced"
  1321. warnings. We now include more information, to figure out why we
  1322. might be cleaning a microdescriptor for being too old if it's
  1323. still referenced by a live node_t object.
  1324. o Minor bugfixes (client, DNSPort):
  1325. - When using DNSPort, try to respond to AAAA requests with AAAA
  1326. answers. Previously, we hadn't looked at the request type when
  1327. deciding which answer type to prefer. Fixes bug 10468; bugfix on
  1328. 0.2.4.7-alpha.
  1329. - When receiving a DNS query for an unsupported record type, reply
  1330. with no answer rather than with a NOTIMPL error. This behavior
  1331. isn't correct either, but it will break fewer client programs, we
  1332. hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
  1333. from "epoch".
  1334. o Minor bugfixes (exit relay):
  1335. - Stop leaking memory when we successfully resolve a PTR record.
  1336. Fixes bug 11437; bugfix on 0.2.4.7-alpha.
  1337. o Minor bugfixes (bridge client):
  1338. - Stop accepting bridge lines containing hostnames. Doing so would
  1339. cause clients to perform DNS requests on the hostnames, which was
  1340. not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
  1341. - Avoid a 60-second delay in the bootstrapping process when a Tor
  1342. client with pluggable transports re-reads its configuration at
  1343. just the wrong time. Re-fixes bug 11156; bugfix on 0.2.5.3-alpha.
  1344. o Minor bugfixes (client, logging during bootstrap):
  1345. - Warn only once if we start logging in an unsafe way. Previously,
  1346. we complain as many times as we had problems. Fixes bug 9870;
  1347. bugfix on 0.2.5.1-alpha.
  1348. - Only report the first fatal bootstrap error on a given OR
  1349. connection. This stops us from telling the controller bogus error
  1350. messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
  1351. - Be more helpful when trying to run sandboxed on Linux without
  1352. libseccomp. Instead of saying "Sandbox is not implemented on this
  1353. platform", we now explain that we need to be built with
  1354. libseccomp. Fixes bug 11543; bugfix on 0.2.5.1-alpha.
  1355. - Avoid generating spurious warnings when starting with
  1356. DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
  1357. 0.2.3.9-alpha.
  1358. o Minor bugfixes (closing OR connections):
  1359. - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
  1360. check if it's an or_connection_t and correctly call
  1361. connection_or_close_for_error() rather than
  1362. connection_mark_for_close() directly. Fixes bug 11304; bugfix on
  1363. 0.2.4.4-alpha.
  1364. - When closing all connections on setting DisableNetwork to 1, use
  1365. connection_or_close_normally() rather than closing OR connections
  1366. out from under the channel layer. Fixes bug 11306; bugfix on
  1367. 0.2.4.4-alpha.
  1368. o Minor bugfixes (controller):
  1369. - Avoid sending a garbage value to the controller when a circuit is
  1370. cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
  1371. o Minor bugfixes (tor-fw-helper):
  1372. - Allow tor-fw-helper to build again by adding src/ext to its
  1373. CPPFLAGS. Fixes bug 11296; bugfix on 0.2.5.3-alpha.
  1374. o Minor bugfixes (bridges):
  1375. - Avoid potential crashes or bad behavior when launching a
  1376. server-side managed proxy with ORPort or ExtORPort temporarily
  1377. disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
  1378. o Minor bugfixes (platform-specific):
  1379. - Fix compilation on Solaris, which does not have <endian.h>. Fixes
  1380. bug 11426; bugfix on 0.2.5.3-alpha.
  1381. - When dumping a malformed directory object to disk, save it in
  1382. binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
  1383. 0.2.2.1-alpha.
  1384. - Don't report failures from make_socket_reuseable() on incoming
  1385. sockets on OSX: this can happen when incoming connections close
  1386. early. Fixes bug 10081.
  1387. o Minor bugfixes (trivial memory leaks):
  1388. - Fix a small memory leak when signing a directory object. Fixes bug
  1389. 11275; bugfix on 0.2.4.13-alpha.
  1390. - Free placeholder entries in our circuit table at exit; fixes a
  1391. harmless memory leak. Fixes bug 11278; bugfix on 0.2.5.1-alpha.
  1392. - Don't re-initialize a second set of OpenSSL mutexes when starting
  1393. up. Previously, we'd make one set of mutexes, and then immediately
  1394. replace them with another. Fixes bug 11726; bugfix on
  1395. 0.2.5.3-alpha.
  1396. - Resolve some memory leaks found by coverity in the unit tests, on
  1397. exit in tor-gencert, and on a failure to compute digests for our
  1398. own keys when generating a v3 networkstatus vote. These leaks
  1399. should never have affected anyone in practice.
  1400. o Minor bugfixes (hidden service):
  1401. - Only retry attempts to connect to a chosen rendezvous point 8
  1402. times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
  1403. o Minor bugfixes (misc code correctness):
  1404. - Fix various instances of undefined behavior in channeltls.c,
  1405. tor_memmem(), and eventdns.c that would cause us to construct
  1406. pointers to memory outside an allocated object. (These invalid
  1407. pointers were not accessed, but C does not even allow them to
  1408. exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
  1409. 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
  1410. - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
  1411. fix some miscellaneous errors in our tests and codebase. Fixes bug
  1412. 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
  1413. - Always check return values for unlink, munmap, UnmapViewOfFile;
  1414. check strftime return values more often. In some cases all we can
  1415. do is report a warning, but this may help prevent deeper bugs from
  1416. going unnoticed. Closes ticket 8787; bugfixes on many, many tor
  1417. versions.
  1418. - Fix numerous warnings from the clang "scan-build" static analyzer.
  1419. Some of these are programming style issues; some of them are false
  1420. positives that indicated awkward code; some are undefined behavior
  1421. cases related to constructing (but not using) invalid pointers;
  1422. some are assumptions about API behavior; some are (harmlessly)
  1423. logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
  1424. correct; and one or two are genuine bugs that weren't reachable
  1425. from the rest of the program. Fixes bug 8793; bugfixes on many,
  1426. many tor versions.
  1427. o Documentation:
  1428. - Build the torify.1 manpage again. Previously, we were only trying
  1429. to build it when also building tor-fw-helper. That's why we didn't
  1430. notice that we'd broken the ability to build it. Fixes bug 11321;
  1431. bugfix on 0.2.5.1-alpha.
  1432. - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
  1433. 11061; bugfix on 0.2.4.7-alpha.
  1434. - Correctly document that we search for a system torrc file before
  1435. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  1436. 0.2.3.18-rc.
  1437. - Resolve warnings from Doxygen.
  1438. o Code simplifications and refactoring:
  1439. - Remove is_internal_IP() function. Resolves ticket 4645.
  1440. - Remove unused function circuit_dump_by_chan from circuitlist.c.
  1441. Closes issue 9107; patch from "marek".
  1442. - Change our use of the ENUM_BF macro to avoid declarations that
  1443. confuse Doxygen.
  1444. o Deprecated versions:
  1445. - Tor 0.2.2.x has reached end-of-life; it has received no patches or
  1446. attention for some while. Directory authorities no longer accept
  1447. descriptors from relays running any version of Tor prior to Tor
  1448. 0.2.3.16-alpha. Resolves ticket 11149.
  1449. o Testing:
  1450. - New macros in test.h to simplify writing mock-functions for unit
  1451. tests. Part of ticket 11507. Patch from Dana Koch.
  1452. - Complete tests for the status.c module. Resolves ticket 11507.
  1453. Patch from Dana Koch.
  1454. o Removed code:
  1455. - Remove all code for the long unused v1 directory protocol.
  1456. Resolves ticket 11070.
  1457. Changes in version 0.2.5.3-alpha - 2014-03-22
  1458. Tor 0.2.5.3-alpha includes all the fixes from 0.2.4.21. It contains
  1459. two new anti-DoS features for Tor relays, resolves a bug that kept
  1460. SOCKS5 support for IPv6 from working, fixes several annoying usability
  1461. issues for bridge users, and removes more old code for unused
  1462. directory formats.
  1463. The Tor 0.2.5.x release series is now in patch-freeze: no feature
  1464. patches not already written will be considered for inclusion in 0.2.5.x.
  1465. o Major features (relay security, DoS-resistance):
  1466. - When deciding whether we have run out of memory and we need to
  1467. close circuits, also consider memory allocated in buffers for
  1468. streams attached to each circuit.
  1469. This change, which extends an anti-DoS feature introduced in
  1470. 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
  1471. better resist more memory-based DoS attacks than before. Since the
  1472. MaxMemInCellQueues option now applies to all queues, it is renamed
  1473. to MaxMemInQueues. This feature fixes bug 10169.
  1474. - Avoid hash-flooding denial-of-service attacks by using the secure
  1475. SipHash-2-4 hash function for our hashtables. Without this
  1476. feature, an attacker could degrade performance of a targeted
  1477. client or server by flooding their data structures with a large
  1478. number of entries to be stored at the same hash table position,
  1479. thereby slowing down the Tor instance. With this feature, hash
  1480. table positions are derived from a randomized cryptographic key,
  1481. and an attacker cannot predict which entries will collide. Closes
  1482. ticket 4900.
  1483. - Decrease the lower limit of MaxMemInQueues to 256 MBytes (but leave
  1484. the default at 8GBytes), to better support Raspberry Pi users. Fixes
  1485. bug 9686; bugfix on 0.2.4.14-alpha.
  1486. o Minor features (bridges, pluggable transports):
  1487. - Bridges now write the SHA1 digest of their identity key
  1488. fingerprint (that is, a hash of a hash of their public key) to
  1489. notice-level logs, and to a new hashed-fingerprint file. This
  1490. information will help bridge operators look up their bridge in
  1491. Globe and similar tools. Resolves ticket 10884.
  1492. - Improve the message that Tor displays when running as a bridge
  1493. using pluggable transports without an Extended ORPort listener.
  1494. Also, log the message in the log file too. Resolves ticket 11043.
  1495. o Minor features (other):
  1496. - Add a new option, PredictedPortsRelevanceTime, to control how long
  1497. after having received a request to connect to a given port Tor
  1498. will try to keep circuits ready in anticipation of future requests
  1499. for that port. Patch from "unixninja92"; implements ticket 9176.
  1500. - Generate a warning if any ports are listed in the SocksPolicy,
  1501. DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
  1502. AuthDirBadExit options. (These options only support address
  1503. ranges.) Fixes part of ticket 11108.
  1504. - Update geoip and geoip6 to the February 7 2014 Maxmind GeoLite2
  1505. Country database.
  1506. o Minor bugfixes (new since 0.2.5.2-alpha, also in 0.2.4.21):
  1507. - Build without warnings under clang 3.4. (We have some macros that
  1508. define static functions only some of which will get used later in
  1509. the module. Starting with clang 3.4, these give a warning unless the
  1510. unused attribute is set on them.) Resolves ticket 10904.
  1511. - Fix build warnings about missing "a2x" comment when building the
  1512. manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
  1513. Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
  1514. o Minor bugfixes (client):
  1515. - Improve the log message when we can't connect to a hidden service
  1516. because all of the hidden service directory nodes hosting its
  1517. descriptor are excluded. Improves on our fix for bug 10722, which
  1518. was a bugfix on 0.2.0.10-alpha.
  1519. - Raise a control port warning when we fail to connect to all of
  1520. our bridges. Previously, we didn't inform the controller, and
  1521. the bootstrap process would stall. Fixes bug 11069; bugfix on
  1522. 0.2.1.2-alpha.
  1523. - Exit immediately when a process-owning controller exits.
  1524. Previously, tor relays would wait for a little while after their
  1525. controller exited, as if they had gotten an INT signal -- but this
  1526. was problematic, since there was no feedback for the user. To do a
  1527. clean shutdown, controllers should send an INT signal and give Tor
  1528. a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
  1529. - Stop attempting to connect to bridges before our pluggable
  1530. transports are configured (harmless but resulted in some erroneous
  1531. log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
  1532. - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
  1533. generating incorrect SOCKS5 responses, and confusing client
  1534. applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
  1535. o Minor bugfixes (relays and bridges):
  1536. - Avoid crashing on a malformed resolv.conf file when running a
  1537. relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
  1538. - Non-exit relays no longer launch mock DNS requests to check for
  1539. DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
  1540. non-exit relays stopped servicing DNS requests. Fixes bug 965;
  1541. bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
  1542. - Bridges now report complete directory request statistics. Related
  1543. to bug 5824; bugfix on 0.2.2.1-alpha.
  1544. - Bridges now never collect statistics that were designed for
  1545. relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
  1546. - Stop giving annoying warning messages when we decide not to launch
  1547. a pluggable transport proxy that we don't need (because there are
  1548. no bridges configured to use it). Resolves ticket 5018; bugfix
  1549. on 0.2.5.2-alpha.
  1550. - Give the correct URL in the warning message when trying to run a
  1551. relay on an ancient version of Windows. Fixes bug 9393.
  1552. o Minor bugfixes (backtrace support):
  1553. - Support automatic backtraces on more platforms by using the
  1554. "-fasynchronous-unwind-tables" compiler option. This option is
  1555. needed for platforms like 32-bit Intel where "-fomit-frame-pointer"
  1556. is on by default and table generation is not. This doesn't yet
  1557. add Windows support; only Linux, OSX, and some BSDs are affected.
  1558. Reported by 'cypherpunks'; fixes bug 11047; bugfix on 0.2.5.2-alpha.
  1559. - Avoid strange behavior if two threads hit failed assertions at the
  1560. same time and both try to log backtraces at once. (Previously, if
  1561. this had happened, both threads would have stored their intermediate
  1562. results in the same buffer, and generated junk outputs.) Reported by
  1563. "cypherpunks". Fixes bug 11048; bugfix on 0.2.5.2-alpha.
  1564. - Fix a compiler warning in format_number_sigsafe(). Bugfix on
  1565. 0.2.5.2-alpha; patch from Nick Hopper.
  1566. o Minor bugfixes (unit tests):
  1567. - Fix a small bug in the unit tests that might have made the tests
  1568. call 'chmod' with an uninitialized bitmask. Fixes bug 10928;
  1569. bugfix on 0.2.5.1-alpha. Patch from Dana Koch.
  1570. o Removed code:
  1571. - Remove all remaining code related to version-0 hidden service
  1572. descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
  1573. the rest of bug 10841.
  1574. o Documentation:
  1575. - Document in the manpage that "KBytes" may also be written as
  1576. "kilobytes" or "KB", that "Kbits" may also be written as
  1577. "kilobits", and so forth. Closes ticket 9222.
  1578. - Document that the ClientOnly config option overrides ORPort.
  1579. Our old explanation made ClientOnly sound as though it did
  1580. nothing at all. Resolves bug 9059.
  1581. - Explain that SocksPolicy, DirPolicy, and similar options don't
  1582. take port arguments. Fixes the other part of ticket 11108.
  1583. - Fix a comment about the rend_server_descriptor_t.protocols field
  1584. to more accurately describe its range. Also, make that field
  1585. unsigned, to more accurately reflect its usage. Fixes bug 9099;
  1586. bugfix on 0.2.1.5-alpha.
  1587. - Fix the manpage's description of HiddenServiceAuthorizeClient:
  1588. the maximum client name length is 16, not 19. Fixes bug 11118;
  1589. bugfix on 0.2.1.6-alpha.
  1590. o Code simplifications and refactoring:
  1591. - Get rid of router->address, since in all cases it was just the
  1592. string representation of router->addr. Resolves ticket 5528.
  1593. o Test infrastructure:
  1594. - Update to the latest version of tinytest.
  1595. - Improve the tinytest implementation of string operation tests so
  1596. that comparisons with NULL strings no longer crash the tests; they
  1597. now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
  1598. Changes in version 0.2.4.21 - 2014-02-28
  1599. Tor 0.2.4.21 further improves security against potential adversaries who
  1600. find breaking 1024-bit crypto doable, and backports several stability
  1601. and robustness patches from the 0.2.5 branch.
  1602. o Major features (client security):
  1603. - When we choose a path for a 3-hop circuit, make sure it contains
  1604. at least one relay that supports the NTor circuit extension
  1605. handshake. Otherwise, there is a chance that we're building
  1606. a circuit that's worth attacking by an adversary who finds
  1607. breaking 1024-bit crypto doable, and that chance changes the game
  1608. theory. Implements ticket 9777.
  1609. o Major bugfixes:
  1610. - Do not treat streams that fail with reason
  1611. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  1612. since it could also indicate an ENETUNREACH connection error. Fixes
  1613. part of bug 10777; bugfix on 0.2.4.8-alpha.
  1614. o Code simplification and refactoring:
  1615. - Remove data structures which were introduced to implement the
  1616. CellStatistics option: they are now redundant with the new timestamp
  1617. field in the regular packed_cell_t data structure, which we did
  1618. in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
  1619. o Minor features:
  1620. - Always clear OpenSSL bignums before freeing them -- even bignums
  1621. that don't contain secrets. Resolves ticket 10793. Patch by
  1622. Florent Daigniere.
  1623. - Build without warnings under clang 3.4. (We have some macros that
  1624. define static functions only some of which will get used later in
  1625. the module. Starting with clang 3.4, these give a warning unless the
  1626. unused attribute is set on them.) Resolves ticket 10904.
  1627. - Update geoip and geoip6 files to the February 7 2014 Maxmind
  1628. GeoLite2 Country database.
  1629. o Minor bugfixes:
  1630. - Set the listen() backlog limit to the largest actually supported
  1631. on the system, not to the value in a header file. Fixes bug 9716;
  1632. bugfix on every released Tor.
  1633. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  1634. exit node as a NOROUTE error, not an INTERNAL error, since they
  1635. can apparently happen when trying to connect to the wrong sort
  1636. of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
  1637. - Fix build warnings about missing "a2x" comment when building the
  1638. manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
  1639. Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
  1640. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  1641. not entirely remove it from the connection lists. Fixes bug 9602;
  1642. bugfix on 0.2.4.4-alpha.
  1643. - Fix a segmentation fault in our benchmark code when running with
  1644. Fedora's OpenSSL package, or any other OpenSSL that provides
  1645. ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
  1646. - Turn "circuit handshake stats since last time" log messages into a
  1647. heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
  1648. o Documentation fixes:
  1649. - Document that all but one DirPort entry must have the NoAdvertise
  1650. flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
  1651. Changes in version 0.2.5.2-alpha - 2014-02-13
  1652. Tor 0.2.5.2-alpha includes all the fixes from 0.2.4.18-rc and 0.2.4.20,
  1653. like the "poor random number generation" fix and the "building too many
  1654. circuits" fix. It also further improves security against potential
  1655. adversaries who find breaking 1024-bit crypto doable, and launches
  1656. pluggable transports on demand (which gets us closer to integrating
  1657. pluggable transport support by default -- not to be confused with Tor
  1658. bundles enabling pluggable transports and bridges by default).
  1659. o Major features (client security):
  1660. - When we choose a path for a 3-hop circuit, make sure it contains
  1661. at least one relay that supports the NTor circuit extension
  1662. handshake. Otherwise, there is a chance that we're building
  1663. a circuit that's worth attacking by an adversary who finds
  1664. breaking 1024-bit crypto doable, and that chance changes the game
  1665. theory. Implements ticket 9777.
  1666. - Clients now look at the "usecreatefast" consensus parameter to
  1667. decide whether to use CREATE_FAST or CREATE cells for the first hop
  1668. of their circuit. This approach can improve security on connections
  1669. where Tor's circuit handshake is stronger than the available TLS
  1670. connection security levels, but the tradeoff is more computational
  1671. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  1672. o Major features (bridges):
  1673. - Don't launch pluggable transport proxies if we don't have any
  1674. bridges configured that would use them. Now we can list many
  1675. pluggable transports, and Tor will dynamically start one when it
  1676. hears a bridge address that needs it. Resolves ticket 5018.
  1677. - The bridge directory authority now assigns status flags (Stable,
  1678. Guard, etc) to bridges based on thresholds calculated over all
  1679. Running bridges. Now bridgedb can finally make use of its features
  1680. to e.g. include at least one Stable bridge in its answers. Fixes
  1681. bug 9859.
  1682. o Major features (other):
  1683. - Extend ORCONN controller event to include an "ID" parameter,
  1684. and add four new controller event types CONN_BW, CIRC_BW,
  1685. CELL_STATS, and TB_EMPTY that show connection and circuit usage.
  1686. The new events are emitted in private Tor networks only, with the
  1687. goal of being able to better track performance and load during
  1688. full-network simulations. Implements proposal 218 and ticket 7359.
  1689. - On some platforms (currently: recent OSX versions, glibc-based
  1690. platforms that support the ELF format, and a few other
  1691. Unix-like operating systems), Tor can now dump stack traces
  1692. when a crash occurs or an assertion fails. By default, traces
  1693. are dumped to stderr (if possible) and to any logs that are
  1694. reporting errors. Implements ticket 9299.
  1695. o Major bugfixes:
  1696. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  1697. not entirely remove it from the connection lists. Fixes bug 9602;
  1698. bugfix on 0.2.4.4-alpha.
  1699. - Do not treat streams that fail with reason
  1700. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  1701. since it could also indicate an ENETUNREACH connection error. Fixes
  1702. part of bug 10777; bugfix on 0.2.4.8-alpha.
  1703. o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
  1704. - Do not allow OpenSSL engines to replace the PRNG, even when
  1705. HardwareAccel is set. The only default builtin PRNG engine uses
  1706. the Intel RDRAND instruction to replace the entire PRNG, and
  1707. ignores all attempts to seed it with more entropy. That's
  1708. cryptographically stupid: the right response to a new alleged
  1709. entropy source is never to discard all previously used entropy
  1710. sources. Fixes bug 10402; works around behavior introduced in
  1711. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  1712. and "rl1987".
  1713. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  1714. address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
  1715. - Avoid launching spurious extra circuits when a stream is pending.
  1716. This fixes a bug where any circuit that _wasn't_ unusable for new
  1717. streams would be treated as if it were, causing extra circuits to
  1718. be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
  1719. o Major bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
  1720. - No longer stop reading or writing on cpuworker connections when
  1721. our rate limiting buckets go empty. Now we should handle circuit
  1722. handshake requests more promptly. Resolves bug 9731.
  1723. - Stop trying to bootstrap all our directory information from
  1724. only our first guard. Discovered while fixing bug 9946; bugfix
  1725. on 0.2.4.8-alpha.
  1726. o Minor features (bridges, pluggable transports):
  1727. - Add threshold cutoffs to the networkstatus document created by
  1728. the Bridge Authority. Fixes bug 1117.
  1729. - On Windows, spawn background processes using the CREATE_NO_WINDOW
  1730. flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
  1731. doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
  1732. Vidalia set this option for us.) Implements ticket 10297.
  1733. o Minor features (security):
  1734. - Always clear OpenSSL bignums before freeing them -- even bignums
  1735. that don't contain secrets. Resolves ticket 10793. Patch by
  1736. Florent Daignière.
  1737. o Minor features (config options and command line):
  1738. - Add an --allow-missing-torrc commandline option that tells Tor to
  1739. run even if the configuration file specified by -f is not available.
  1740. Implements ticket 10060.
  1741. - Add support for the TPROXY transparent proxying facility on Linux.
  1742. See documentation for the new TransProxyType option for more
  1743. details. Implementation by "thomo". Closes ticket 10582.
  1744. o Minor features (controller):
  1745. - Add a new "HS_DESC" controller event that reports activities
  1746. related to hidden service descriptors. Resolves ticket 8510.
  1747. - New "DROPGUARDS" controller command to forget all current entry
  1748. guards. Not recommended for ordinary use, since replacing guards
  1749. too frequently makes several attacks easier. Resolves ticket 9934;
  1750. patch from "ra".
  1751. o Minor features (build):
  1752. - Assume that a user using ./configure --host wants to cross-compile,
  1753. and give an error if we cannot find a properly named
  1754. tool-chain. Add a --disable-tool-name-check option to proceed
  1755. nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
  1756. - If we run ./configure and the compiler recognizes -fstack-protector
  1757. but the linker rejects it, warn the user about a potentially missing
  1758. libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
  1759. o Minor features (testing):
  1760. - If Python is installed, "make check" now runs extra tests beyond
  1761. the unit test scripts.
  1762. - When bootstrapping a test network, sometimes very few relays get
  1763. the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
  1764. specify a set of relays which should be voted Guard regardless of
  1765. their uptime or bandwidth. Addresses ticket 9206.
  1766. o Minor features (log messages):
  1767. - When ServerTransportPlugin is set on a bridge, Tor can write more
  1768. useful statistics about bridge use in its extrainfo descriptors,
  1769. but only if the Extended ORPort ("ExtORPort") is set too. Add a
  1770. log message to inform the user in this case. Resolves ticket 9651.
  1771. - When receiving a new controller connection, log the origin address.
  1772. Resolves ticket 9698; patch from "sigpipe".
  1773. - When logging OpenSSL engine status at startup, log the status of
  1774. more engines. Fixes ticket 10043; patch from Joshua Datko.
  1775. - Turn "circuit handshake stats since last time" log messages into a
  1776. heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
  1777. o Minor features (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
  1778. - Improve the circuit queue out-of-memory handler. Previously, when
  1779. we ran low on memory, we'd close whichever circuits had the most
  1780. queued cells. Now, we close those that have the *oldest* queued
  1781. cells, on the theory that those are most responsible for us
  1782. running low on memory. Based on analysis from a forthcoming paper
  1783. by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
  1784. - Generate bootstrapping status update events correctly when fetching
  1785. microdescriptors. Fixes bug 9927.
  1786. - Update to the October 2 2013 Maxmind GeoLite Country database.
  1787. o Minor bugfixes (clients):
  1788. - When closing a channel that has already been open, do not close
  1789. pending circuits that were waiting to connect to the same relay.
  1790. Fixes bug 9880; bugfix on 0.2.5.1-alpha. Thanks to skruffy for
  1791. finding this bug.
  1792. o Minor bugfixes (relays):
  1793. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  1794. exit node as a NOROUTE error, not an INTERNAL error, since they
  1795. can apparently happen when trying to connect to the wrong sort
  1796. of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
  1797. o Minor bugfixes (bridges):
  1798. - Fix a bug where the first connection works to a bridge that uses a
  1799. pluggable transport with client-side parameters, but we don't send
  1800. the client-side parameters on subsequent connections. (We don't
  1801. use any pluggable transports with client-side parameters yet,
  1802. but ScrambleSuit will soon become the first one.) Fixes bug 9162;
  1803. bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
  1804. o Minor bugfixes (node selection):
  1805. - If ExcludeNodes is set, consider non-excluded hidden service
  1806. directory servers before excluded ones. Do not consider excluded
  1807. hidden service directory servers at all if StrictNodes is
  1808. set. (Previously, we would sometimes decide to connect to those
  1809. servers, and then realize before we initiated a connection that
  1810. we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
  1811. Reported by "mr-4".
  1812. - If we set the ExitNodes option but it doesn't include any nodes
  1813. that have the Exit flag, we would choose not to bootstrap. Now we
  1814. bootstrap so long as ExitNodes includes nodes which can exit to
  1815. some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
  1816. o Minor bugfixes (controller and command-line):
  1817. - If changing a config option via "setconf" fails in a recoverable
  1818. way, we used to nonetheless write our new control ports to the
  1819. file described by the "ControlPortWriteToFile" option. Now we only
  1820. write out that file if we successfully switch to the new config
  1821. option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
  1822. - When a command-line option such as --version or --help that
  1823. ordinarily implies --hush appears on the command line along with
  1824. --quiet, then actually obey --quiet. Previously, we obeyed --quiet
  1825. only if it appeared later on the command line. Fixes bug 9578;
  1826. bugfix on 0.2.5.1-alpha.
  1827. o Minor bugfixes (code correctness):
  1828. - Previously we used two temporary files when writing descriptors to
  1829. disk; now we only use one. Fixes bug 1376.
  1830. - Remove an erroneous (but impossible and thus harmless) pointer
  1831. comparison that would have allowed compilers to skip a bounds
  1832. check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
  1833. 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
  1834. - Fix an always-true assertion in pluggable transports code so it
  1835. actually checks what it was trying to check. Fixes bug 10046;
  1836. bugfix on 0.2.3.9-alpha. Found by "dcb".
  1837. o Minor bugfixes (protocol correctness):
  1838. - When receiving a VERSIONS cell with an odd number of bytes, close
  1839. the connection immediately since the cell is malformed. Fixes bug
  1840. 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
  1841. "rl1987".
  1842. o Minor bugfixes (build):
  1843. - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
  1844. turned off (that is, without support for v2 link handshakes). Fixes
  1845. bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
  1846. - Fix compilation warnings and startup issues when running with
  1847. "Sandbox 1" and libseccomp-2.1.0. Fixes bug 10563; bugfix on
  1848. 0.2.5.1-alpha.
  1849. - Fix compilation on Solaris 9, which didn't like us having an
  1850. identifier named "sun". Fixes bug 10565; bugfix in 0.2.5.1-alpha.
  1851. o Minor bugfixes (testing):
  1852. - Fix a segmentation fault in our benchmark code when running with
  1853. Fedora's OpenSSL package, or any other OpenSSL that provides
  1854. ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
  1855. o Minor bugfixes (log messages):
  1856. - Fix a bug where clients using bridges would report themselves
  1857. as 50% bootstrapped even without a live consensus document.
  1858. Fixes bug 9922; bugfix on 0.2.1.1-alpha.
  1859. - Suppress a warning where, if there's only one directory authority
  1860. in the network, we would complain that votes and signatures cannot
  1861. be uploaded to other directory authorities. Fixes bug 10842;
  1862. bugfix on 0.2.2.26-beta.
  1863. - Report bootstrapping progress correctly when we're downloading
  1864. microdescriptors. We had updated our "do we have enough microdescs
  1865. to begin building circuits?" logic most recently in 0.2.4.10-alpha
  1866. (see bug 5956), but we left the bootstrap status event logic at
  1867. "how far through getting 1/4 of them are we?" Fixes bug 9958;
  1868. bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
  1869. o Minor bugfixes (new since 0.2.5.1-alpha, also in 0.2.4.20):
  1870. - Avoid a crash bug when starting with a corrupted microdescriptor
  1871. cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
  1872. - If we fail to dump a previously cached microdescriptor to disk, avoid
  1873. freeing duplicate data later on. Fixes bug 10423; bugfix on
  1874. 0.2.4.13-alpha. Spotted by "bobnomnom".
  1875. o Minor bugfixes on 0.2.4.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
  1876. - Correctly log long IPv6 exit policies, instead of truncating them
  1877. or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
  1878. - Our default TLS ecdhe groups were backwards: we meant to be using
  1879. P224 for relays (for performance win) and P256 for bridges (since
  1880. it is more common in the wild). Instead we had it backwards. After
  1881. reconsideration, we decided that the default should be P256 on all
  1882. hosts, since its security is probably better, and since P224 is
  1883. reportedly used quite little in the wild. Found by "skruffy" on
  1884. IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
  1885. - Free directory authority certificate download statuses on exit
  1886. rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
  1887. o Minor bugfixes on 0.2.3.x (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
  1888. - If the guard we choose first doesn't answer, we would try the
  1889. second guard, but once we connected to the second guard we would
  1890. abandon it and retry the first one, slowing down bootstrapping.
  1891. The fix is to treat all our initially chosen guards as acceptable
  1892. to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
  1893. - Fix an assertion failure that would occur when disabling the
  1894. ORPort setting on a running Tor process while accounting was
  1895. enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
  1896. - When examining the list of network interfaces to find our address,
  1897. do not consider non-running or disabled network interfaces. Fixes
  1898. bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
  1899. - Avoid an off-by-one error when checking buffer boundaries when
  1900. formatting the exit status of a pluggable transport helper.
  1901. This is probably not an exploitable bug, but better safe than
  1902. sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
  1903. Pedro Ribeiro.
  1904. o Removed code and features:
  1905. - Clients now reject any directory authority certificates lacking
  1906. a dir-key-crosscert element. These have been included since
  1907. 0.2.1.9-alpha, so there's no real reason for them to be optional
  1908. any longer. Completes proposal 157. Resolves ticket 10162.
  1909. - Remove all code that existed to support the v2 directory system,
  1910. since there are no longer any v2 directory authorities. Resolves
  1911. ticket 10758.
  1912. - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
  1913. options, which were used for designating authorities as "Hidden
  1914. service authorities". There has been no use of hidden service
  1915. authorities since 0.2.2.1-alpha, when we stopped uploading or
  1916. downloading v0 hidden service descriptors. Fixes bug 10881; also
  1917. part of a fix for bug 10841.
  1918. o Code simplification and refactoring:
  1919. - Remove some old fallback code designed to keep Tor clients working
  1920. in a network with only two working relays. Elsewhere in the code we
  1921. have long since stopped supporting such networks, so there wasn't
  1922. much point in keeping it around. Addresses ticket 9926.
  1923. - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
  1924. bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
  1925. - Remove data structures which were introduced to implement the
  1926. CellStatistics option: they are now redundant with the addition
  1927. of a timestamp to the regular packed_cell_t data structure, which
  1928. we did in 0.2.4.18-rc in order to resolve ticket 9093. Implements
  1929. ticket 10870.
  1930. o Documentation (man page) fixes:
  1931. - Update manpage to describe some of the files you can expect to
  1932. find in Tor's DataDirectory. Addresses ticket 9839.
  1933. - Document that all but one DirPort entry must have the NoAdvertise
  1934. flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
  1935. o Documentation fixes (new since 0.2.5.1-alpha, also in 0.2.4.18-rc):
  1936. - Clarify the usage and risks of setting the ContactInfo torrc line
  1937. for your relay or bridge. Resolves ticket 9854.
  1938. - Add anchors to the manpage so we can link to the html version of
  1939. the documentation for specific options. Resolves ticket 9866.
  1940. - Replace remaining references to DirServer in man page and
  1941. log entries. Resolves ticket 10124.
  1942. o Tool changes:
  1943. - Make the "tor-gencert" tool used by directory authority operators
  1944. create 2048-bit signing keys by default (rather than 1024-bit, since
  1945. 1024-bit is uncomfortably small these days). Addresses ticket 10324.
  1946. Changes in version 0.2.4.20 - 2013-12-22
  1947. Tor 0.2.4.20 fixes potentially poor random number generation for users
  1948. who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
  1949. torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
  1950. and 4) have no state file in their DataDirectory (as would happen on
  1951. first start). Users who generated relay or hidden service identity
  1952. keys in such a situation should discard them and generate new ones.
  1953. This release also fixes a logic error that caused Tor clients to build
  1954. many more preemptive circuits than they actually need.
  1955. o Major bugfixes:
  1956. - Do not allow OpenSSL engines to replace the PRNG, even when
  1957. HardwareAccel is set. The only default builtin PRNG engine uses
  1958. the Intel RDRAND instruction to replace the entire PRNG, and
  1959. ignores all attempts to seed it with more entropy. That's
  1960. cryptographically stupid: the right response to a new alleged
  1961. entropy source is never to discard all previously used entropy
  1962. sources. Fixes bug 10402; works around behavior introduced in
  1963. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  1964. and "rl1987".
  1965. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  1966. address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
  1967. - Avoid launching spurious extra circuits when a stream is pending.
  1968. This fixes a bug where any circuit that _wasn't_ unusable for new
  1969. streams would be treated as if it were, causing extra circuits to
  1970. be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
  1971. o Minor bugfixes:
  1972. - Avoid a crash bug when starting with a corrupted microdescriptor
  1973. cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
  1974. - If we fail to dump a previously cached microdescriptor to disk, avoid
  1975. freeing duplicate data later on. Fixes bug 10423; bugfix on
  1976. 0.2.4.13-alpha. Spotted by "bobnomnom".
  1977. Changes in version 0.2.4.19 - 2013-12-11
  1978. The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
  1979. (1986-2013). Aaron worked on diverse projects including helping to guide
  1980. Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
  1981. transparency to the U.S government's PACER documents, and contributing
  1982. design and development for Tor and Tor2Web. Aaron was one of the latest
  1983. martyrs in our collective fight for civil liberties and human rights,
  1984. and his death is all the more painful because he was one of us.
  1985. Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
  1986. a new circuit handshake and link encryption that use ECC to provide
  1987. better security and efficiency; makes relays better manage circuit
  1988. creation requests; uses "directory guards" to reduce client enumeration
  1989. risks; makes bridges collect and report statistics about the pluggable
  1990. transports they support; cleans up and improves our geoip database;
  1991. gets much closer to IPv6 support for clients, bridges, and relays; makes
  1992. directory authorities use measured bandwidths rather than advertised
  1993. ones when computing flags and thresholds; disables client-side DNS
  1994. caching to reduce tracking risks; and fixes a big bug in bridge
  1995. reachability testing. This release introduces two new design
  1996. abstractions in the code: a new "channel" abstraction between circuits
  1997. and or_connections to allow for implementing alternate relay-to-relay
  1998. transports, and a new "circuitmux" abstraction storing the queue of
  1999. circuits for a channel. The release also includes many stability,
  2000. security, and privacy fixes.
  2001. Changes in version 0.2.4.18-rc - 2013-11-16
  2002. Tor 0.2.4.18-rc is the fourth release candidate for the Tor 0.2.4.x
  2003. series. It takes a variety of fixes from the 0.2.5.x branch to improve
  2004. stability, performance, and better handling of edge cases.
  2005. o Major features:
  2006. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  2007. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  2008. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  2009. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  2010. them to solve bug 6033.)
  2011. o Major bugfixes:
  2012. - No longer stop reading or writing on cpuworker connections when
  2013. our rate limiting buckets go empty. Now we should handle circuit
  2014. handshake requests more promptly. Resolves bug 9731.
  2015. - If we are unable to save a microdescriptor to the journal, do not
  2016. drop it from memory and then reattempt downloading it. Fixes bug
  2017. 9645; bugfix on 0.2.2.6-alpha.
  2018. - Stop trying to bootstrap all our directory information from
  2019. only our first guard. Discovered while fixing bug 9946; bugfix
  2020. on 0.2.4.8-alpha.
  2021. - The new channel code sometimes lost track of in-progress circuits,
  2022. causing long-running clients to stop building new circuits. The
  2023. fix is to always call circuit_n_chan_done(chan, 0) from
  2024. channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
  2025. o Minor bugfixes (on 0.2.4.x):
  2026. - Correctly log long IPv6 exit policies, instead of truncating them
  2027. or reporting an error. Fixes bug 9596; bugfix on 0.2.4.7-alpha.
  2028. - Our default TLS ecdhe groups were backwards: we meant to be using
  2029. P224 for relays (for performance win) and P256 for bridges (since
  2030. it is more common in the wild). Instead we had it backwards. After
  2031. reconsideration, we decided that the default should be P256 on all
  2032. hosts, since its security is probably better, and since P224 is
  2033. reportedly used quite little in the wild. Found by "skruffy" on
  2034. IRC. Fix for bug 9780; bugfix on 0.2.4.8-alpha.
  2035. - Free directory authority certificate download statuses on exit
  2036. rather than leaking them. Fixes bug 9644; bugfix on 0.2.4.13-alpha.
  2037. o Minor bugfixes (on 0.2.3.x and earlier):
  2038. - If the guard we choose first doesn't answer, we would try the
  2039. second guard, but once we connected to the second guard we would
  2040. abandon it and retry the first one, slowing down bootstrapping.
  2041. The fix is to treat all our initially chosen guards as acceptable
  2042. to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
  2043. - Fix an assertion failure that would occur when disabling the
  2044. ORPort setting on a running Tor process while accounting was
  2045. enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
  2046. - When examining the list of network interfaces to find our address,
  2047. do not consider non-running or disabled network interfaces. Fixes
  2048. bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
  2049. - Avoid an off-by-one error when checking buffer boundaries when
  2050. formatting the exit status of a pluggable transport helper.
  2051. This is probably not an exploitable bug, but better safe than
  2052. sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
  2053. Pedro Ribeiro.
  2054. o Minor features (protecting client timestamps):
  2055. - Clients no longer send timestamps in their NETINFO cells. These were
  2056. not used for anything, and they provided one small way for clients
  2057. to be distinguished from each other as they moved from network to
  2058. network or behind NAT. Implements part of proposal 222.
  2059. - Clients now round timestamps in INTRODUCE cells down to the nearest
  2060. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  2061. if it's set to "auto" and the feature is disabled in the consensus,
  2062. the timestamp is sent as 0 instead. Implements part of proposal 222.
  2063. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  2064. a big deal from a security point of view, but it achieves no actual
  2065. good purpose, and isn't needed. Implements part of proposal 222.
  2066. - Reduce down accuracy of timestamps in hidden service descriptors.
  2067. Implements part of proposal 222.
  2068. o Minor features (other):
  2069. - Improve the circuit queue out-of-memory handler. Previously, when
  2070. we ran low on memory, we'd close whichever circuits had the most
  2071. queued cells. Now, we close those that have the *oldest* queued
  2072. cells, on the theory that those are most responsible for us
  2073. running low on memory. Based on analysis from a forthcoming paper
  2074. by Jansen, Tschorsch, Johnson, and Scheuermann. Fixes bug 9093.
  2075. - Generate bootstrapping status update events correctly when fetching
  2076. microdescriptors. Fixes bug 9927.
  2077. - Update to the October 2 2013 Maxmind GeoLite Country database.
  2078. o Documentation fixes:
  2079. - Clarify the usage and risks of setting the ContactInfo torrc line
  2080. for your relay or bridge. Resolves ticket 9854.
  2081. - Add anchors to the manpage so we can link to the html version of
  2082. the documentation for specific options. Resolves ticket 9866.
  2083. - Replace remaining references to DirServer in man page and
  2084. log entries. Resolves ticket 10124.
  2085. Changes in version 0.2.5.1-alpha - 2013-10-02
  2086. Tor 0.2.5.1-alpha introduces experimental support for syscall sandboxing
  2087. on Linux, allows bridges that offer pluggable transports to report usage
  2088. statistics, fixes many issues to make testing easier, and provides
  2089. a pile of minor features and bugfixes that have been waiting for a
  2090. release of the new branch.
  2091. This is the first alpha release in a new series, so expect there to
  2092. be bugs. Users who would rather test out a more stable branch should
  2093. stay with 0.2.4.x for now.
  2094. o Major features (security):
  2095. - Use the seccomp2 syscall filtering facility on Linux to limit
  2096. which system calls Tor can invoke. This is an experimental,
  2097. Linux-only feature to provide defense-in-depth against unknown
  2098. attacks. To try turning it on, set "Sandbox 1" in your torrc
  2099. file. Please be ready to report bugs. We hope to add support
  2100. for better sandboxing in the future, including more fine-grained
  2101. filters, better division of responsibility, and support for more
  2102. platforms. This work has been done by Cristian-Matei Toader for
  2103. Google Summer of Code.
  2104. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  2105. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  2106. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  2107. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  2108. them to solve bug 6033.)
  2109. o Major features (other):
  2110. - Add support for passing arguments to managed pluggable transport
  2111. proxies. Implements ticket 3594.
  2112. - Bridges now track GeoIP information and the number of their users
  2113. even when pluggable transports are in use, and report usage
  2114. statistics in their extra-info descriptors. Resolves tickets 4773
  2115. and 5040.
  2116. - Make testing Tor networks bootstrap better: lower directory fetch
  2117. retry schedules and maximum interval without directory requests,
  2118. and raise maximum download tries. Implements ticket 6752.
  2119. - Add make target 'test-network' to run tests on a Chutney network.
  2120. Implements ticket 8530.
  2121. - The ntor handshake is now on-by-default, no matter what the
  2122. directory authorities recommend. Implements ticket 8561.
  2123. o Major bugfixes:
  2124. - Instead of writing destroy cells directly to outgoing connection
  2125. buffers, queue them and intersperse them with other outgoing cells.
  2126. This can prevent a set of resource starvation conditions where too
  2127. many pending destroy cells prevent data cells from actually getting
  2128. delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
  2129. bugfix on 0.2.0.1-alpha.
  2130. - If we are unable to save a microdescriptor to the journal, do not
  2131. drop it from memory and then reattempt downloading it. Fixes bug
  2132. 9645; bugfix on 0.2.2.6-alpha.
  2133. - The new channel code sometimes lost track of in-progress circuits,
  2134. causing long-running clients to stop building new circuits. The
  2135. fix is to always call circuit_n_chan_done(chan, 0) from
  2136. channel_closed(). Fixes bug 9776; bugfix on 0.2.4.17-rc.
  2137. o Build features:
  2138. - Tor now builds each source file in two modes: a mode that avoids
  2139. exposing identifiers needlessly, and another mode that exposes
  2140. more identifiers for testing. This lets the compiler do better at
  2141. optimizing the production code, while enabling us to take more
  2142. radical measures to let the unit tests test things.
  2143. - The production builds no longer include functions used only in
  2144. the unit tests; all functions exposed from a module only for
  2145. unit-testing are now static in production builds.
  2146. - Add an --enable-coverage configuration option to make the unit
  2147. tests (and a new src/or/tor-cov target) to build with gcov test
  2148. coverage support.
  2149. o Testing:
  2150. - We now have rudimentary function mocking support that our unit
  2151. tests can use to test functions in isolation. Function mocking
  2152. lets the tests temporarily replace a function's dependencies with
  2153. stub functions, so that the tests can check the function without
  2154. invoking the other functions it calls.
  2155. - Add more unit tests for the <circid,channel>->circuit map, and
  2156. the destroy-cell-tracking code to fix bug 7912.
  2157. - Unit tests for failing cases of the TAP onion handshake.
  2158. - More unit tests for address-manipulation functions.
  2159. o Minor features (protecting client timestamps):
  2160. - Clients no longer send timestamps in their NETINFO cells. These were
  2161. not used for anything, and they provided one small way for clients
  2162. to be distinguished from each other as they moved from network to
  2163. network or behind NAT. Implements part of proposal 222.
  2164. - Clients now round timestamps in INTRODUCE cells down to the nearest
  2165. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  2166. if it's set to "auto" and the feature is disabled in the consensus,
  2167. the timestamp is sent as 0 instead. Implements part of proposal 222.
  2168. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  2169. a big deal from a security point of view, but it achieves no actual
  2170. good purpose, and isn't needed. Implements part of proposal 222.
  2171. - Reduce down accuracy of timestamps in hidden service descriptors.
  2172. Implements part of proposal 222.
  2173. o Minor features (config options):
  2174. - Config (torrc) lines now handle fingerprints which are missing
  2175. their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
  2176. - Support a --dump-config option to print some or all of the
  2177. configured options. Mainly useful for debugging the command-line
  2178. option parsing code. Helps resolve ticket 4647.
  2179. - Raise awareness of safer logging: notify user of potentially
  2180. unsafe config options, like logging more verbosely than severity
  2181. "notice" or setting SafeLogging to 0. Resolves ticket 5584.
  2182. - Add a new configuration option TestingV3AuthVotingStartOffset
  2183. that bootstraps a network faster by changing the timing for
  2184. consensus votes. Addresses ticket 8532.
  2185. - Add a new torrc option "ServerTransportOptions" that allows
  2186. bridge operators to pass configuration parameters to their
  2187. pluggable transports. Resolves ticket 8929.
  2188. - The config (torrc) file now accepts bandwidth and space limits in
  2189. bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
  2190. you can now say "16 kilobits", and so on.) Resolves ticket 9214.
  2191. Patch by CharlieB.
  2192. o Minor features (build):
  2193. - Add support for `--library-versions` flag. Implements ticket 6384.
  2194. - Return the "unexpected sendme" warnings to a warn severity, but make
  2195. them rate limited, to help diagnose ticket 8093.
  2196. - Detect a missing asciidoc, and warn the user about it, during
  2197. configure rather than at build time. Fixes issue 6506. Patch from
  2198. Arlo Breault.
  2199. o Minor features (other):
  2200. - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
  2201. sockets in a single system call. Implements ticket 5129.
  2202. - Log current accounting state (bytes sent and received + remaining
  2203. time for the current accounting period) in the relay's heartbeat
  2204. message. Implements ticket 5526; patch from Peter Retzlaff.
  2205. - Implement the TRANSPORT_LAUNCHED control port event that
  2206. notifies controllers about new launched pluggable
  2207. transports. Resolves ticket 5609.
  2208. - If we're using the pure-C 32-bit curve25519_donna implementation
  2209. of curve25519, build it with the -fomit-frame-pointer option to
  2210. make it go faster on register-starved hosts. This improves our
  2211. handshake performance by about 6% on i386 hosts without nacl.
  2212. Closes ticket 8109.
  2213. - Update to the September 4 2013 Maxmind GeoLite Country database.
  2214. o Minor bugfixes:
  2215. - Set the listen() backlog limit to the largest actually supported
  2216. on the system, not to the value in a header file. Fixes bug 9716;
  2217. bugfix on every released Tor.
  2218. - No longer accept malformed http headers when parsing urls from
  2219. headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
  2220. bugfix on 0.0.6pre1.
  2221. - In munge_extrainfo_into_routerinfo(), check the return value of
  2222. memchr(). This would have been a serious issue if we ever passed
  2223. it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
  2224. from Arlo Breault.
  2225. - On the chance that somebody manages to build Tor on a
  2226. platform where time_t is unsigned, correct the way that
  2227. microdesc_add_to_cache() handles negative time arguments.
  2228. Fixes bug 8042; bugfix on 0.2.3.1-alpha.
  2229. - Reject relative control socket paths and emit a warning. Previously,
  2230. single-component control socket paths would be rejected, but Tor
  2231. would not log why it could not validate the config. Fixes bug 9258;
  2232. bugfix on 0.2.3.16-alpha.
  2233. o Minor bugfixes (command line):
  2234. - Use a single command-line parser for parsing torrc options on the
  2235. command line and for finding special command-line options to avoid
  2236. inconsistent behavior for torrc option arguments that have the same
  2237. names as command-line options. Fixes bugs 4647 and 9578; bugfix on
  2238. 0.0.9pre5.
  2239. - No longer allow 'tor --hash-password' with no arguments. Fixes bug
  2240. 9573; bugfix on 0.0.9pre5.
  2241. o Minor fixes (build, auxiliary programs):
  2242. - Stop preprocessing the "torify" script with autoconf, since
  2243. it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
  2244. from Guilhem.
  2245. - The tor-fw-helper program now follows the standard convention and
  2246. exits with status code "0" on success. Fixes bug 9030; bugfix on
  2247. 0.2.3.1-alpha. Patch by Arlo Breault.
  2248. - Corrected ./configure advice for what openssl dev package you should
  2249. install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
  2250. o Minor code improvements:
  2251. - Remove constants and tests for PKCS1 padding; it's insecure and
  2252. shouldn't be used for anything new. Fixes bug 8792; patch
  2253. from Arlo Breault.
  2254. - Remove instances of strcpy() from the unit tests. They weren't
  2255. hurting anything, since they were only in the unit tests, but it's
  2256. embarassing to have strcpy() in the code at all, and some analysis
  2257. tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
  2258. 0.2.3.8-alpha. Patch from Arlo Breault.
  2259. o Removed features:
  2260. - Remove migration code from when we renamed the "cached-routers"
  2261. file to "cached-descriptors" back in 0.2.0.8-alpha. This
  2262. incidentally resolves ticket 6502 by cleaning up the related code
  2263. a bit. Patch from Akshay Hebbar.
  2264. o Code simplification and refactoring:
  2265. - Extract the common duplicated code for creating a subdirectory
  2266. of the data directory and writing to a file in it. Fixes ticket
  2267. 4282; patch from Peter Retzlaff.
  2268. - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
  2269. buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
  2270. i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
  2271. - Add a set of accessor functions for the circuit timeout data
  2272. structure. Fixes ticket 6153; patch from "piet".
  2273. - Clean up exit paths from connection_listener_new(). Closes ticket
  2274. 8789. Patch from Arlo Breault.
  2275. - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
  2276. and drop our own custom pkey_eq() implementation. Fixes bug 9043.
  2277. - Use a doubly-linked list to implement the global circuit list.
  2278. Resolves ticket 9108. Patch from Marek Majkowski.
  2279. - Remove contrib/id_to_fp.c since it wasn't used anywhere.
  2280. Changes in version 0.2.4.17-rc - 2013-09-05
  2281. Tor 0.2.4.17-rc is the third release candidate for the Tor 0.2.4.x
  2282. series. It adds an emergency step to help us tolerate the massive
  2283. influx of users: 0.2.4 clients using the new (faster and safer) "NTor"
  2284. circuit-level handshakes now effectively jump the queue compared to
  2285. the 0.2.3 clients using "TAP" handshakes. This release also fixes a
  2286. big bug hindering bridge reachability tests.
  2287. o Major features:
  2288. - Relays now process the new "NTor" circuit-level handshake requests
  2289. with higher priority than the old "TAP" circuit-level handshake
  2290. requests. We still process some TAP requests to not totally starve
  2291. 0.2.3 clients when NTor becomes popular. A new consensus parameter
  2292. "NumNTorsPerTAP" lets us tune the balance later if we need to.
  2293. Implements ticket 9574.
  2294. o Major bugfixes:
  2295. - If the circuit build timeout logic is disabled (via the consensus,
  2296. or because we are an authority), then don't build testing circuits.
  2297. Fixes bug 9657; bugfix on 0.2.2.14-alpha.
  2298. - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
  2299. previously they did not, which prevented them from receiving
  2300. successful connections from relays for self-test or bandwidth
  2301. testing. Also, when a relay is extending a circuit to a bridge,
  2302. it needs to send a NETINFO cell, even when the bridge hasn't sent
  2303. an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
  2304. - If the time to download the next old-style networkstatus is in
  2305. the future, do not decline to consider whether to download the
  2306. next microdescriptor networkstatus. Fixes bug 9564; bugfix on
  2307. 0.2.3.14-alpha.
  2308. o Minor bugfixes:
  2309. - Avoid double-closing the listener socket in our socketpair()
  2310. replacement (used on Windows) in the case where the addresses on
  2311. our opened sockets don't match what we expected. Fixes bug 9400;
  2312. bugfix on 0.0.2pre7. Found by Coverity.
  2313. o Minor fixes (config options):
  2314. - Avoid overflows when the user sets MaxCircuitDirtiness to a
  2315. ridiculously high value, by imposing a (ridiculously high) 30-day
  2316. maximum on MaxCircuitDirtiness.
  2317. - Fix the documentation of HeartbeatPeriod to say that the heartbeat
  2318. message is logged at notice, not at info.
  2319. - Warn and fail if a server is configured not to advertise any
  2320. ORPorts at all. (We need *something* to put in our descriptor,
  2321. or we just won't work.)
  2322. o Minor features:
  2323. - Track how many "TAP" and "NTor" circuit handshake requests we get,
  2324. and how many we complete, and log it every hour to help relay
  2325. operators follow trends in network load. Addresses ticket 9658.
  2326. - Update to the August 7 2013 Maxmind GeoLite Country database.
  2327. Changes in version 0.2.4.16-rc - 2013-08-10
  2328. Tor 0.2.4.16-rc is the second release candidate for the Tor 0.2.4.x
  2329. series. It fixes several crash bugs in the 0.2.4 branch.
  2330. o Major bugfixes:
  2331. - Fix a bug in the voting algorithm that could yield incorrect results
  2332. when a non-naming authority declared too many flags. Fixes bug 9200;
  2333. bugfix on 0.2.0.3-alpha.
  2334. - Fix an uninitialized read that could in some cases lead to a remote
  2335. crash while parsing INTRODUCE2 cells. Bugfix on 0.2.4.1-alpha.
  2336. Anybody running a hidden service on the experimental 0.2.4.x
  2337. branch should upgrade. (This is, so far as we know, unrelated to
  2338. the recent news.)
  2339. - Avoid an assertion failure when processing DNS replies without the
  2340. answer types we expected. Fixes bug 9337; bugfix on 0.2.4.7-alpha.
  2341. - Avoid a crash when using --hash-password. Fixes bug 9295; bugfix on
  2342. 0.2.4.15-rc. Found by stem integration tests.
  2343. o Minor bugfixes:
  2344. - Fix an invalid memory read that occured when a pluggable
  2345. transport proxy failed its configuration protocol.
  2346. Fixes bug 9288; bugfix on 0.2.4.1-alpha.
  2347. - When evaluating whether to use a connection that we haven't
  2348. decided is canonical using a recent link protocol version,
  2349. decide that it's canonical only if it used address _does_
  2350. match the desired address. Fixes bug 9309; bugfix on
  2351. 0.2.4.4-alpha. Reported by skruffy.
  2352. - Make the default behavior of NumDirectoryGuards be to track
  2353. NumEntryGuards. Now a user who changes only NumEntryGuards will get
  2354. the behavior she expects. Fixes bug 9354; bugfix on 0.2.4.8-alpha.
  2355. - Fix a spurious compilation warning with some older versions of
  2356. GCC on FreeBSD. Fixes bug 9254; bugfix on 0.2.4.14-alpha.
  2357. o Minor features:
  2358. - Update to the July 3 2013 Maxmind GeoLite Country database.
  2359. Changes in version 0.2.4.15-rc - 2013-07-01
  2360. Tor 0.2.4.15-rc is the first release candidate for the Tor 0.2.4.x
  2361. series. It fixes a few smaller bugs, but generally appears stable.
  2362. Please test it and let us know whether it is!
  2363. o Major bugfixes:
  2364. - When receiving a new configuration file via the control port's
  2365. LOADCONF command, do not treat the defaults file as absent.
  2366. Fixes bug 9122; bugfix on 0.2.3.9-alpha.
  2367. o Minor features:
  2368. - Issue a warning when running with the bufferevents backend enabled.
  2369. It's still not stable, and people should know that they're likely
  2370. to hit unexpected problems. Closes ticket 9147.
  2371. Changes in version 0.2.4.14-alpha - 2013-06-18
  2372. Tor 0.2.4.14-alpha fixes a pair of client guard enumeration problems
  2373. present in 0.2.4.13-alpha.
  2374. o Major bugfixes:
  2375. - When we have too much memory queued in circuits (according to a new
  2376. MaxMemInCellQueues option), close the circuits consuming the most
  2377. memory. This prevents us from running out of memory as a relay if
  2378. circuits fill up faster than they can be drained. Fixes bug 9063;
  2379. bugfix on the 54th commit of Tor. This bug is a further fix beyond
  2380. bug 6252, whose fix was merged into 0.2.3.21-rc.
  2381. This change also fixes an earlier approach taken in 0.2.4.13-alpha,
  2382. where we tried to solve this issue simply by imposing an upper limit
  2383. on the number of queued cells for a single circuit. That approach
  2384. proved to be problematic, since there are ways to provoke clients to
  2385. send a number of cells in excess of any such reasonable limit. Fixes
  2386. bug 9072; bugfix on 0.2.4.13-alpha.
  2387. - Limit hidden service descriptors to at most ten introduction
  2388. points, to slow one kind of guard enumeration. Fixes bug 9002;
  2389. bugfix on 0.1.1.11-alpha.
  2390. Changes in version 0.2.4.13-alpha - 2013-06-14
  2391. Tor 0.2.4.13-alpha fixes a variety of potential remote crash
  2392. vulnerabilities, makes socks5 username/password circuit isolation
  2393. actually actually work (this time for sure!), and cleans up a bunch
  2394. of other issues in preparation for a release candidate.
  2395. o Major bugfixes (robustness):
  2396. - Close any circuit that has too many cells queued on it. Fixes
  2397. bug 9063; bugfix on the 54th commit of Tor. This bug is a further
  2398. fix beyond bug 6252, whose fix was merged into 0.2.3.21-rc.
  2399. - Prevent the get_freelists() function from running off the end of
  2400. the list of freelists if it somehow gets an unrecognized
  2401. allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
  2402. eugenis.
  2403. - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
  2404. when an exit connection with optimistic data succeeds immediately
  2405. rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
  2406. 0.2.3.1-alpha.
  2407. - Fix a directory authority crash bug when building a consensus
  2408. using an older consensus as its basis. Fixes bug 8833. Bugfix
  2409. on 0.2.4.12-alpha.
  2410. o Major bugfixes:
  2411. - Avoid a memory leak where we would leak a consensus body when we
  2412. find that a consensus which we couldn't previously verify due to
  2413. missing certificates is now verifiable. Fixes bug 8719; bugfix
  2414. on 0.2.0.10-alpha.
  2415. - We used to always request authority certificates by identity digest,
  2416. meaning we'd get the newest one even when we wanted one with a
  2417. different signing key. Then we would complain about being given
  2418. a certificate we already had, and never get the one we really
  2419. wanted. Now we use the "fp-sk/" resource as well as the "fp/"
  2420. resource to request the one we want. Fixes bug 5595; bugfix on
  2421. 0.2.0.8-alpha.
  2422. - Follow the socks5 protocol when offering username/password
  2423. authentication. The fix for bug 8117 exposed this bug, and it
  2424. turns out real-world applications like Pidgin do care. Bugfix on
  2425. 0.2.3.2-alpha; fixes bug 8879.
  2426. - Prevent failures on Windows Vista and later when rebuilding the
  2427. microdescriptor cache. Diagnosed by Robert Ransom. Fixes bug 8822;
  2428. bugfix on 0.2.4.12-alpha.
  2429. o Minor bugfixes:
  2430. - Fix an impossible buffer overrun in the AES unit tests. Fixes
  2431. bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
  2432. - If for some reason we fail to write a microdescriptor while
  2433. rebuilding the cache, do not let the annotations from that
  2434. microdescriptor linger in the cache file, and do not let the
  2435. microdescriptor stay recorded as present in its old location.
  2436. Fixes bug 9047; bugfix on 0.2.2.6-alpha.
  2437. - Fix a memory leak that would occur whenever a configuration
  2438. option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
  2439. - Paste the description for PathBias parameters from the man
  2440. page into or.h, so the code documents them too. Fixes bug 7982;
  2441. bugfix on 0.2.3.17-beta and 0.2.4.8-alpha.
  2442. - Relays now treat a changed IPv6 ORPort as sufficient reason to
  2443. publish an updated descriptor. Fixes bug 6026; bugfix on
  2444. 0.2.4.1-alpha.
  2445. - When launching a resolve request on behalf of an AF_UNIX control
  2446. socket, omit the address field of the new entry connection, used in
  2447. subsequent controller events, rather than letting tor_dup_addr()
  2448. set it to "<unknown address type>". Fixes bug 8639; bugfix on
  2449. 0.2.4.12-alpha.
  2450. o Minor bugfixes (log messages):
  2451. - Fix a scaling issue in the path bias accounting code that
  2452. resulted in "Bug:" log messages from either
  2453. pathbias_scale_close_rates() or pathbias_count_build_success().
  2454. This represents a bugfix on a previous bugfix: the original fix
  2455. attempted in 0.2.4.10-alpha was incomplete. Fixes bug 8235; bugfix
  2456. on 0.2.4.1-alpha.
  2457. - Give a less useless error message when the user asks for an IPv4
  2458. address on an IPv6-only port, or vice versa. Fixes bug 8846; bugfix
  2459. on 0.2.4.7-alpha.
  2460. o Minor features:
  2461. - Downgrade "unexpected SENDME" warnings to protocol-warn for 0.2.4.x,
  2462. to tolerate bug 8093 for now.
  2463. - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
  2464. in directory authority votes to describe whether they have enough
  2465. measured bandwidths to ignore advertised (relay descriptor)
  2466. bandwidth claims. Resolves ticket 8711.
  2467. - Update to the June 5 2013 Maxmind GeoLite Country database.
  2468. o Removed documentation:
  2469. - Remove some of the older contents of doc/ as obsolete; move others
  2470. to torspec.git. Fixes bug 8965.
  2471. o Code simplification and refactoring:
  2472. - Avoid using character buffers when constructing most directory
  2473. objects: this approach was unwieldy and error-prone. Instead,
  2474. build smartlists of strings, and concatenate them when done.
  2475. Changes in version 0.2.4.12-alpha - 2013-04-18
  2476. Tor 0.2.4.12-alpha moves Tor forward on several fronts: it starts the
  2477. process for lengthening the guard rotation period, makes directory
  2478. authority opinions in the consensus a bit less gameable, makes socks5
  2479. username/password circuit isolation actually work, and fixes a wide
  2480. variety of other issues.
  2481. o Major features:
  2482. - Raise the default time that a client keeps an entry guard from
  2483. "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
  2484. 2012 paper. (We would make it even longer, but we need better client
  2485. load balancing first.) Also, make the guard lifetime controllable
  2486. via a new GuardLifetime torrc option and a GuardLifetime consensus
  2487. parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
  2488. - Directory authorities now prefer using measured bandwidths to
  2489. advertised ones when computing flags and thresholds. Resolves
  2490. ticket 8273.
  2491. - Directory authorities that have more than a threshold number
  2492. of relays with measured bandwidths now treat relays with unmeasured
  2493. bandwidths as having bandwidth 0. Resolves ticket 8435.
  2494. o Major bugfixes (assert / resource use):
  2495. - Avoid a bug where our response to TLS renegotiation under certain
  2496. network conditions could lead to a busy-loop, with 100% CPU
  2497. consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
  2498. - Avoid an assertion when we discover that we'd like to write a cell
  2499. onto a closing connection: just discard the cell. Fixes another
  2500. case of bug 7350; bugfix on 0.2.4.4-alpha.
  2501. o Major bugfixes (client-side privacy):
  2502. - When we mark a circuit as unusable for new circuits, have it
  2503. continue to be unusable for new circuits even if MaxCircuitDirtiness
  2504. is increased too much at the wrong time, or the system clock jumps
  2505. backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
  2506. - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
  2507. which have resolved to internal addresses") is set, apply that
  2508. rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
  2509. - When an exit relay rejects a stream with reason "exit policy", but
  2510. we only know an exit policy summary (e.g. from the microdesc
  2511. consensus) for it, do not mark the relay as useless for all exiting.
  2512. Instead, mark just the circuit as unsuitable for that particular
  2513. address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
  2514. - Allow applications to get proper stream isolation with
  2515. IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
  2516. username/password authentication also offer "no authentication". Tor
  2517. had previously preferred "no authentication", so the applications
  2518. never actually sent Tor their auth details. Now Tor selects
  2519. username/password authentication if it's offered. You can disable
  2520. this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
  2521. bug 8117; bugfix on 0.2.3.3-alpha.
  2522. o Major bugfixes (other):
  2523. - When unable to find any working directory nodes to use as a
  2524. directory guard, give up rather than adding the same non-working
  2525. nodes to the directory guard list over and over. Fixes bug 8231;
  2526. bugfix on 0.2.4.8-alpha.
  2527. o Minor features:
  2528. - Reject as invalid most directory objects containing a NUL.
  2529. Belt-and-suspender fix for bug 8037.
  2530. - In our testsuite, create temporary directories with a bit more
  2531. entropy in their name to make name collisions less likely. Fixes
  2532. bug 8638.
  2533. - Add CACHED keyword to ADDRMAP events in the control protocol
  2534. to indicate whether a DNS result will be cached or not. Resolves
  2535. ticket 8596.
  2536. - Update to the April 3 2013 Maxmind GeoLite Country database.
  2537. o Minor features (build):
  2538. - Detect and reject attempts to build Tor with threading support
  2539. when OpenSSL has been compiled without threading support.
  2540. Fixes bug 6673.
  2541. - Clarify that when autoconf is checking for nacl, it is checking
  2542. specifically for nacl with a fast curve25519 implementation.
  2543. Fixes bug 8014.
  2544. - Warn if building on a platform with an unsigned time_t: there
  2545. are too many places where Tor currently assumes that time_t can
  2546. hold negative values. We'd like to fix them all, but probably
  2547. some will remain.
  2548. o Minor bugfixes (build):
  2549. - Fix some bugs in tor-fw-helper-natpmp when trying to build and
  2550. run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
  2551. Fixes bug 7280; bugfix on 0.2.3.1-alpha.
  2552. - Add the old src/or/micro-revision.i filename to CLEANFILES.
  2553. On the off chance that somebody has one, it will go away as soon
  2554. as they run "make clean". Fix for bug 7143; bugfix on 0.2.4.1-alpha.
  2555. - Build Tor correctly on 32-bit platforms where the compiler can build
  2556. but not run code using the "uint128_t" construction. Fixes bug 8587;
  2557. bugfix on 0.2.4.8-alpha.
  2558. - Fix compilation warning with some versions of clang that would
  2559. prefer the -Wswitch-enum compiler flag to warn about switch
  2560. statements with missing enum values, even if those switch
  2561. statements have a "default:" statement. Fixes bug 8598; bugfix
  2562. on 0.2.4.10-alpha.
  2563. o Minor bugfixes (protocol):
  2564. - Fix the handling of a TRUNCATE cell when it arrives while the
  2565. circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
  2566. - Fix a misframing issue when reading the version numbers in a
  2567. VERSIONS cell. Previously we would recognize [00 01 00 02] as
  2568. 'version 1, version 2, and version 0x100', when it should have
  2569. only included versions 1 and 2. Fixes bug 8059; bugfix on
  2570. 0.2.0.10-alpha. Reported pseudonymously.
  2571. - Make the format and order of STREAM events for DNS lookups
  2572. consistent among the various ways to launch DNS lookups. Fixes
  2573. bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy."
  2574. - Correct our check for which versions of Tor support the EXTEND2
  2575. cell. We had been willing to send it to Tor 0.2.4.7-alpha and
  2576. later, when support was really added in version 0.2.4.8-alpha.
  2577. Fixes bug 8464; bugfix on 0.2.4.8-alpha.
  2578. o Minor bugfixes (other):
  2579. - Correctly store microdescriptors and extrainfo descriptors with
  2580. an internal NUL byte. Fixes bug 8037; bugfix on 0.2.0.1-alpha.
  2581. Bug reported by "cypherpunks".
  2582. - Increase the width of the field used to remember a connection's
  2583. link protocol version to two bytes. Harmless for now, since the
  2584. only currently recognized versions are one byte long. Reported
  2585. pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
  2586. - If the state file's path bias counts are invalid (presumably from a
  2587. buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
  2588. additional checks and log messages to the scaling of Path Bias
  2589. counts, in case there still are remaining issues with scaling.
  2590. Should help resolve bug 8235.
  2591. - Eliminate several instances where we use "Nickname=ID" to refer to
  2592. nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
  2593. "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
  2594. on 0.2.3.21-rc, 0.2.4.5-alpha, 0.2.4.8-alpha, and 0.2.4.10-alpha.
  2595. o Minor bugfixes (syscalls):
  2596. - Always check the return values of functions fcntl() and
  2597. setsockopt(). We don't believe these are ever actually failing in
  2598. practice, but better safe than sorry. Also, checking these return
  2599. values should please analysis tools like Coverity. Patch from
  2600. 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
  2601. - Use direct writes rather than stdio when building microdescriptor
  2602. caches, in an attempt to mitigate bug 8031, or at least make it
  2603. less common.
  2604. o Minor bugfixes (config):
  2605. - When rejecting a configuration because we were unable to parse a
  2606. quoted string, log an actual error message. Fixes bug 7950; bugfix
  2607. on 0.2.0.16-alpha.
  2608. - Behave correctly when the user disables LearnCircuitBuildTimeout
  2609. but doesn't tell us what they would like the timeout to be. Fixes
  2610. bug 6304; bugfix on 0.2.2.14-alpha.
  2611. - When autodetecting the number of CPUs, use the number of available
  2612. CPUs in preference to the number of configured CPUs. Inform the
  2613. user if this reduces the number of available CPUs. Fixes bug 8002;
  2614. bugfix on 0.2.3.1-alpha.
  2615. - Make it an error when you set EntryNodes but disable UseGuardNodes,
  2616. since it will (surprisingly to some users) ignore EntryNodes. Fixes
  2617. bug 8180; bugfix on 0.2.3.11-alpha.
  2618. - Allow TestingTorNetworks to override the 4096-byte minimum for
  2619. the Fast threshold. Otherwise they can't bootstrap until they've
  2620. observed more traffic. Fixes bug 8508; bugfix on 0.2.4.10-alpha.
  2621. - Fix some logic errors when the user manually overrides the
  2622. PathsNeededToBuildCircuits option in torrc. Fixes bug 8599; bugfix
  2623. on 0.2.4.10-alpha.
  2624. o Minor bugfixes (log messages to help diagnose bugs):
  2625. - If we fail to free a microdescriptor because of bug 7164, log
  2626. the filename and line number from which we tried to free it.
  2627. - Add another diagnostic to the heartbeat message: track and log
  2628. overhead that TLS is adding to the data we write. If this is
  2629. high, we are sending too little data to SSL_write at a time.
  2630. Diagnostic for bug 7707.
  2631. - Add more detail to a log message about relaxed timeouts, to help
  2632. track bug 7799.
  2633. - Warn more aggressively when flushing microdescriptors to a
  2634. microdescriptor cache fails, in an attempt to mitigate bug 8031,
  2635. or at least make it more diagnosable.
  2636. - Improve debugging output to help track down bug 8185 ("Bug:
  2637. outgoing relay cell has n_chan==NULL. Dropping.")
  2638. - Log the purpose of a path-bias testing circuit correctly.
  2639. Improves a log message from bug 8477; bugfix on 0.2.4.8-alpha.
  2640. o Minor bugfixes (0.2.4.x log messages that were too noisy):
  2641. - Don't attempt to relax the timeout of already opened 1-hop circuits.
  2642. They might never timeout. This should eliminate some/all cases of
  2643. the relaxed timeout log message.
  2644. - Use circuit creation time for network liveness evaluation. This
  2645. should eliminate warning log messages about liveness caused
  2646. by changes in timeout evaluation. Fixes bug 6572; bugfix on
  2647. 0.2.4.8-alpha.
  2648. - Reduce a path bias length check from notice to info. The message
  2649. is triggered when creating controller circuits. Fixes bug 8196;
  2650. bugfix on 0.2.4.8-alpha.
  2651. - Fix a path state issue that triggered a notice during relay startup.
  2652. Fixes bug 8320; bugfix on 0.2.4.10-alpha.
  2653. - Reduce occurrences of warns about circuit purpose in
  2654. connection_ap_expire_building(). Fixes bug 8477; bugfix on
  2655. 0.2.4.11-alpha.
  2656. o Minor bugfixes (pre-0.2.4.x log messages that were too noisy):
  2657. - If we encounter a write failure on a SOCKS connection before we
  2658. finish our SOCKS handshake, don't warn that we closed the
  2659. connection before we could send a SOCKS reply. Fixes bug 8427;
  2660. bugfix on 0.1.0.1-rc.
  2661. - Correctly recognize that [::1] is a loopback address. Fixes
  2662. bug 8377; bugfix on 0.2.1.3-alpha.
  2663. - Fix a directory authority warn caused when we have a large amount
  2664. of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
  2665. - Don't log inappropriate heartbeat messages when hibernating: a
  2666. hibernating node is _expected_ to drop out of the consensus,
  2667. decide it isn't bootstrapped, and so forth. Fixes bug 7302;
  2668. bugfix on 0.2.3.1-alpha.
  2669. - Don't complain about bootstrapping problems while hibernating.
  2670. These complaints reflect a general code problem, but not one
  2671. with any problematic effects (no connections are actually
  2672. opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
  2673. o Documentation fixes:
  2674. - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
  2675. names match. Fixes bug 7768.
  2676. - Make the torify manpage no longer refer to tsocks; torify hasn't
  2677. supported tsocks since 0.2.3.14-alpha.
  2678. - Make the tor manpage no longer reference tsocks.
  2679. - Fix the GeoIPExcludeUnknown documentation to refer to
  2680. ExcludeExitNodes rather than the currently nonexistent
  2681. ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
  2682. o Removed files:
  2683. - The tor-tsocks.conf is no longer distributed or installed. We
  2684. recommend that tsocks users use torsocks instead. Resolves
  2685. ticket 8290.
  2686. Changes in version 0.2.4.11-alpha - 2013-03-11
  2687. Tor 0.2.4.11-alpha makes relay measurement by directory authorities
  2688. more robust, makes hidden service authentication work again, and
  2689. resolves a DPI fingerprint for Tor's SSL transport.
  2690. o Major features (directory authorities):
  2691. - Directory authorities now support a new consensus method (17)
  2692. where they cap the published bandwidth of servers for which
  2693. insufficient bandwidth measurements exist. Fixes part of bug 2286.
  2694. - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
  2695. serve any v2 directory information. Now we can test disabling the
  2696. old deprecated v2 directory format, and see whether doing so has
  2697. any effect on network load. Begins to fix bug 6783.
  2698. - Directory authorities now include inside each vote a statement of
  2699. the performance thresholds they used when assigning flags.
  2700. Implements ticket 8151.
  2701. o Major bugfixes (directory authorities):
  2702. - Stop marking every relay as having been down for one hour every
  2703. time we restart a directory authority. These artificial downtimes
  2704. were messing with our Stable and Guard flag calculations. Fixes
  2705. bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
  2706. o Major bugfixes (hidden services):
  2707. - Allow hidden service authentication to succeed again. When we
  2708. refactored the hidden service introduction code back
  2709. in 0.2.4.1-alpha, we didn't update the code that checks
  2710. whether authentication information is present, causing all
  2711. authentication checks to return "false". Fix for bug 8207; bugfix
  2712. on 0.2.4.1-alpha. Found by Coverity; this is CID 718615.
  2713. o Minor features (relays, bridges):
  2714. - Make bridge relays check once a minute for whether their IP
  2715. address has changed, rather than only every 15 minutes. Resolves
  2716. bugs 1913 and 1992.
  2717. - Refactor resolve_my_address() so it returns the method by which we
  2718. decided our public IP address (explicitly configured, resolved from
  2719. explicit hostname, guessed from interfaces, learned by gethostname).
  2720. Now we can provide more helpful log messages when a relay guesses
  2721. its IP address incorrectly (e.g. due to unexpected lines in
  2722. /etc/hosts). Resolves ticket 2267.
  2723. - Teach bridge-using clients to avoid 0.2.2 bridges when making
  2724. microdescriptor-related dir requests, and only fall back to normal
  2725. descriptors if none of their bridges can handle microdescriptors
  2726. (as opposed to the fix in ticket 4013, which caused them to fall
  2727. back to normal descriptors if *any* of their bridges preferred
  2728. them). Resolves ticket 4994.
  2729. - Randomize the lifetime of our SSL link certificate, so censors can't
  2730. use the static value for filtering Tor flows. Resolves ticket 8443;
  2731. related to ticket 4014 which was included in 0.2.2.33.
  2732. - Support a new version of the link protocol that allows 4-byte circuit
  2733. IDs. Previously, circuit IDs were limited to 2 bytes, which presented
  2734. a possible resource exhaustion issue. Closes ticket 7351; implements
  2735. proposal 214.
  2736. o Minor features (portability):
  2737. - Tweak the curve25519-donna*.c implementations to tolerate systems
  2738. that lack stdint.h. Fixes bug 3894; bugfix on 0.2.4.8-alpha.
  2739. - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
  2740. the signs of types during autoconf. This is better than our old
  2741. approach, which didn't work when cross-compiling.
  2742. - Detect the sign of enum values, rather than assuming that MSC is the
  2743. only compiler where enum types are all signed. Fixes bug 7727;
  2744. bugfix on 0.2.4.10-alpha.
  2745. o Minor features (other):
  2746. - Say "KBytes" rather than "KB" in the man page (for various values
  2747. of K), to further reduce confusion about whether Tor counts in
  2748. units of memory or fractions of units of memory. Resolves ticket 7054.
  2749. - Clear the high bit on curve25519 public keys before passing them to
  2750. our backend, in case we ever wind up using a backend that doesn't do
  2751. so itself. If we used such a backend, and *didn't* clear the high bit,
  2752. we could wind up in a situation where users with such backends would
  2753. be distinguishable from users without. Fixes bug 8121; bugfix on
  2754. 0.2.4.8-alpha.
  2755. - Update to the March 6 2013 Maxmind GeoLite Country database.
  2756. o Minor bugfixes (clients):
  2757. - When we receive a RELAY_END cell with the reason DONE, or with no
  2758. reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
  2759. status as "connection refused". Previously we reported these cases
  2760. as success but then immediately closed the connection. Fixes bug
  2761. 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
  2762. - Downgrade an assertion in connection_ap_expire_beginning to an
  2763. LD_BUG message. The fix for bug 8024 should prevent this message
  2764. from displaying, but just in case, a warn that we can diagnose
  2765. is better than more assert crashes. Fixes bug 8065; bugfix on
  2766. 0.2.4.8-alpha.
  2767. - Lower path use bias thresholds to .80 for notice and .60 for warn.
  2768. Also make the rate limiting flags for the path use bias log messages
  2769. independent from the original path bias flags. Fixes bug 8161;
  2770. bugfix on 0.2.4.10-alpha.
  2771. o Minor bugfixes (relays):
  2772. - Stop trying to resolve our hostname so often (e.g. every time we
  2773. think about doing a directory fetch). Now we reuse the cached
  2774. answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
  2775. and 2410 (bugfix on 0.1.2.2-alpha).
  2776. - Stop sending a stray "(null)" in some cases for the server status
  2777. "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
  2778. on 0.1.2.6-alpha.
  2779. - When choosing which stream on a formerly stalled circuit to wake
  2780. first, make better use of the platform's weak RNG. Previously,
  2781. we had been using the % ("modulo") operator to try to generate a
  2782. 1/N chance of picking each stream, but this behaves badly with
  2783. many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
  2784. 0.2.2.20-alpha.
  2785. - Use our own weak RNG when we need a weak RNG. Windows's rand() and
  2786. Irix's random() only return 15 bits; Solaris's random() returns more
  2787. bits but its RAND_MAX says it only returns 15, and so on. Motivated
  2788. by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
  2789. o Minor bugfixes (directory authorities):
  2790. - Directory authorities now use less space when formatting identical
  2791. microdescriptor lines in directory votes. Fixes bug 8158; bugfix
  2792. on 0.2.4.1-alpha.
  2793. o Minor bugfixes (memory leaks spotted by Coverity -- bug 7816):
  2794. - Avoid leaking memory if we fail to compute a consensus signature
  2795. or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
  2796. - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
  2797. on 0.2.1.1-alpha.
  2798. - Fix a memory leak during safe-cookie controller authentication.
  2799. Bugfix on 0.2.3.13-alpha.
  2800. - Avoid memory leak of IPv6 policy content if we fail to format it into
  2801. a router descriptor. Bugfix on 0.2.4.7-alpha.
  2802. o Minor bugfixes (other code correctness issues):
  2803. - Avoid a crash if we fail to generate an extrainfo descriptor.
  2804. Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
  2805. this is CID 718634.
  2806. - When detecting the largest possible file descriptor (in order to
  2807. close all file descriptors when launching a new program), actually
  2808. use _SC_OPEN_MAX. The old code for doing this was very, very broken.
  2809. Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
  2810. is CID 743383.
  2811. - Fix a copy-and-paste error when adding a missing A1 to a routerset
  2812. because of GeoIPExcludeUnknown. Fix for Coverity CID 980650.
  2813. Bugfix on 0.2.4.10-alpha.
  2814. - Fix an impossible-to-trigger integer overflow when estimating how
  2815. long our onionskin queue would take. (This overflow would require us
  2816. to accept 4 million onionskins before processing 100 of them.) Fixes
  2817. bug 8210; bugfix on 0.2.4.10-alpha.
  2818. o Code simplification and refactoring:
  2819. - Add a wrapper function for the common "log a message with a
  2820. rate-limit" case.
  2821. Changes in version 0.2.4.10-alpha - 2013-02-04
  2822. Tor 0.2.4.10-alpha adds defenses at the directory authority level from
  2823. certain attacks that flood the network with relays; changes the queue
  2824. for circuit create requests from a sized-based limit to a time-based
  2825. limit; resumes building with MSVC on Windows; and fixes a wide variety
  2826. of other issues.
  2827. o Major bugfixes (directory authority):
  2828. - When computing directory thresholds, ignore any rejected-as-sybil
  2829. nodes during the computation so that they can't influence Fast,
  2830. Guard, etc. (We should have done this for proposal 109.) Fixes
  2831. bug 8146.
  2832. - When marking a node as a likely sybil, reset its uptime metrics
  2833. to zero, so that it cannot time towards getting marked as Guard,
  2834. Stable, or HSDir. (We should have done this for proposal 109.) Fixes
  2835. bug 8147.
  2836. o Major bugfixes:
  2837. - When a TLS write is partially successful but incomplete, remember
  2838. that the flushed part has been flushed, and notice that bytes were
  2839. actually written. Reported and fixed pseudonymously. Fixes bug
  2840. 7708; bugfix on Tor 0.1.0.5-rc.
  2841. - Reject bogus create and relay cells with 0 circuit ID or 0 stream
  2842. ID: these could be used to create unexpected streams and circuits
  2843. which would count as "present" to some parts of Tor but "absent"
  2844. to others, leading to zombie circuits and streams or to a bandwidth
  2845. denial-of-service. Fixes bug 7889; bugfix on every released version
  2846. of Tor. Reported by "oftc_must_be_destroyed".
  2847. - Rename all macros in our local copy of queue.h to begin with "TOR_".
  2848. This change seems the only good way to permanently prevent conflicts
  2849. with queue.h on various operating systems. Fixes bug 8107; bugfix
  2850. on 0.2.4.6-alpha.
  2851. o Major features (relay):
  2852. - Instead of limiting the number of queued onionskins (aka circuit
  2853. create requests) to a fixed, hard-to-configure number, we limit
  2854. the size of the queue based on how many we expect to be able to
  2855. process in a given amount of time. We estimate the time it will
  2856. take to process an onionskin based on average processing time
  2857. of previous onionskins. Closes ticket 7291. You'll never have to
  2858. configure MaxOnionsPending again.
  2859. o Major features (portability):
  2860. - Resume building correctly with MSVC and Makefile.nmake. This patch
  2861. resolves numerous bugs and fixes reported by ultramage, including
  2862. 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
  2863. - Make the ntor and curve25519 code build correctly with MSVC.
  2864. Fix on 0.2.4.8-alpha.
  2865. o Minor features:
  2866. - When directory authorities are computing thresholds for flags,
  2867. never let the threshold for the Fast flag fall below 4096
  2868. bytes. Also, do not consider nodes with extremely low bandwidths
  2869. when deciding thresholds for various directory flags. This change
  2870. should raise our threshold for Fast relays, possibly in turn
  2871. improving overall network performance; see ticket 1854. Resolves
  2872. ticket 8145.
  2873. - The Tor client now ignores sub-domain components of a .onion
  2874. address. This change makes HTTP "virtual" hosting
  2875. possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
  2876. http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
  2877. hosted on the same hidden service. Implements proposal 204.
  2878. - We compute the overhead from passing onionskins back and forth to
  2879. cpuworkers, and report it when dumping statistics in response to
  2880. SIGUSR1. Supports ticket 7291.
  2881. o Minor features (path selection):
  2882. - When deciding whether we have enough descriptors to build circuits,
  2883. instead of looking at raw relay counts, look at which fraction
  2884. of (bandwidth-weighted) paths we're able to build. This approach
  2885. keeps clients from building circuits if their paths are likely to
  2886. stand out statistically. The default fraction of paths needed is
  2887. taken from the consensus directory; you can override it with the
  2888. new PathsNeededToBuildCircuits option. Fixes ticket 5956.
  2889. - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
  2890. and we have GeoIP information, also exclude all nodes with unknown
  2891. countries "??" and "A1". This behavior is controlled by the
  2892. new GeoIPExcludeUnknown option: you can make such nodes always
  2893. excluded with "GeoIPExcludeUnknown 1", and disable the feature
  2894. with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
  2895. gets you the default behavior. Implements feature 7706.
  2896. - Path Use Bias: Perform separate accounting for successful circuit
  2897. use. Keep separate statistics on stream attempt rates versus stream
  2898. success rates for each guard. Provide configurable thresholds to
  2899. determine when to emit log messages or disable use of guards that
  2900. fail too many stream attempts. Resolves ticket 7802.
  2901. o Minor features (log messages):
  2902. - When learning a fingerprint for a bridge, log its corresponding
  2903. transport type. Implements ticket 7896.
  2904. - Improve the log message when "Bug/attack: unexpected sendme cell
  2905. from client" occurs, to help us track bug 8093.
  2906. o Minor bugfixes:
  2907. - Remove a couple of extraneous semicolons that were upsetting the
  2908. cparser library. Patch by Christian Grothoff. Fixes bug 7115;
  2909. bugfix on 0.2.2.1-alpha.
  2910. - Remove a source of rounding error during path bias count scaling;
  2911. don't count cannibalized circuits as used for path bias until we
  2912. actually try to use them; and fix a circuit_package_relay_cell()
  2913. warning message about n_chan==NULL. Fixes bug 7802.
  2914. - Detect nacl when its headers are in a nacl/ subdirectory. Also,
  2915. actually link against nacl when we're configured to use it. Fixes
  2916. bug 7972; bugfix on 0.2.4.8-alpha.
  2917. - Compile correctly with the --disable-curve25519 option. Fixes
  2918. bug 8153; bugfix on 0.2.4.8-alpha.
  2919. o Build improvements:
  2920. - Do not report status verbosely from autogen.sh unless the -v flag
  2921. is specified. Fixes issue 4664. Patch from Onizuka.
  2922. - Replace all calls to snprintf() outside of src/ext with
  2923. tor_snprintf(). Also remove the #define to replace snprintf with
  2924. _snprintf on Windows; they have different semantics, and all of
  2925. our callers should be using tor_snprintf() anyway. Fixes bug 7304.
  2926. - Try to detect if we are ever building on a platform where
  2927. memset(...,0,...) does not set the value of a double to 0.0. Such
  2928. platforms are permitted by the C standard, though in practice
  2929. they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
  2930. currently support them, but it's better to detect them and fail
  2931. than to perform erroneously.
  2932. o Removed features:
  2933. - Stop exporting estimates of v2 and v3 directory traffic shares
  2934. in extrainfo documents. They were unneeded and sometimes inaccurate.
  2935. Also stop exporting any v2 directory request statistics. Resolves
  2936. ticket 5823.
  2937. - Drop support for detecting and warning about versions of Libevent
  2938. before 1.3e. Nothing reasonable ships with them any longer;
  2939. warning the user about them shouldn't be needed. Resolves ticket
  2940. 6826.
  2941. o Code simplifications and refactoring:
  2942. - Rename "isin" functions to "contains", for grammar. Resolves
  2943. ticket 5285.
  2944. - Rename Tor's logging function log() to tor_log(), to avoid conflicts
  2945. with the natural logarithm function from the system libm. Resolves
  2946. ticket 7599.
  2947. Changes in version 0.2.4.9-alpha - 2013-01-15
  2948. Tor 0.2.4.9-alpha provides a quick fix to make the new ntor handshake
  2949. work more robustly.
  2950. o Major bugfixes:
  2951. - Fix backward compatibility logic when receiving an embedded ntor
  2952. handshake tunneled in a CREATE cell. This clears up the "Bug:
  2953. couldn't format CREATED cell" warning. Fixes bug 7959; bugfix
  2954. on 0.2.4.8-alpha.
  2955. Changes in version 0.2.4.8-alpha - 2013-01-14
  2956. Tor 0.2.4.8-alpha introduces directory guards to reduce user enumeration
  2957. risks, adds a new stronger and faster circuit handshake, and offers
  2958. stronger and faster link encryption when both sides support it.
  2959. o Major features:
  2960. - Preliminary support for directory guards (proposal 207): when
  2961. possible, clients now use their entry guards for non-anonymous
  2962. directory requests. This can help prevent client enumeration. Note
  2963. that this behavior only works when we have a usable consensus
  2964. directory, and when options about what to download are more or less
  2965. standard. In the future we should re-bootstrap from our guards,
  2966. rather than re-bootstrapping from the preconfigured list of
  2967. directory sources that ships with Tor. Resolves ticket 6526.
  2968. - Tor relays and clients now support a better CREATE/EXTEND cell
  2969. format, allowing the sender to specify multiple address, identity,
  2970. and handshake types. Implements Robert Ransom's proposal 200;
  2971. closes ticket 7199.
  2972. o Major features (new circuit handshake):
  2973. - Tor now supports a new circuit extension handshake designed by Ian
  2974. Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
  2975. circuit extension handshake, later called "TAP", was a bit slow
  2976. (especially on the relay side), had a fragile security proof, and
  2977. used weaker keys than we'd now prefer. The new circuit handshake
  2978. uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
  2979. function, making it significantly more secure than the older
  2980. handshake, and significantly faster. Tor can use one of two built-in
  2981. pure-C curve25519-donna implementations by Adam Langley, or it
  2982. can link against the "nacl" library for a tuned version if present.
  2983. The built-in version is very fast for 64-bit systems when building
  2984. with GCC. The built-in 32-bit version is still faster than the
  2985. old TAP protocol, but using libnacl is better on most such hosts.
  2986. Clients don't currently use this protocol by default, since
  2987. comparatively few clients support it so far. To try it, set
  2988. UseNTorHandshake to 1.
  2989. Implements proposal 216; closes ticket 7202.
  2990. o Major features (better link encryption):
  2991. - Relays can now enable the ECDHE TLS ciphersuites when available
  2992. and appropriate. These ciphersuites let us negotiate forward-secure
  2993. TLS secret keys more safely and more efficiently than with our
  2994. previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
  2995. public relays prefer the (faster) P224 group, and bridges prefer
  2996. the (more common) P256 group; you can override this with the
  2997. TLSECGroup option.
  2998. Enabling these ciphers was a little tricky, since for a long time,
  2999. clients had been claiming to support them without actually doing
  3000. so, in order to foil fingerprinting. But with the client-side
  3001. implementation of proposal 198 in 0.2.3.17-beta, clients can now
  3002. match the ciphers from recent Firefox versions *and* list the
  3003. ciphers they actually mean, so relays can believe such clients
  3004. when they advertise ECDHE support in their TLS ClientHello messages.
  3005. This feature requires clients running 0.2.3.17-beta or later,
  3006. and requires both sides to be running OpenSSL 1.0.0 or later
  3007. with ECC support. OpenSSL 1.0.1, with the compile-time option
  3008. "enable-ec_nistp_64_gcc_128", is highly recommended.
  3009. Implements the relay side of proposal 198; closes ticket 7200.
  3010. o Major bugfixes:
  3011. - Avoid crashing when, as a relay without IPv6-exit support, a
  3012. client insists on getting an IPv6 address or nothing. Fixes bug
  3013. 7814; bugfix on 0.2.4.7-alpha.
  3014. o Minor features:
  3015. - Improve circuit build timeout handling for hidden services.
  3016. In particular: adjust build timeouts more accurately depending
  3017. upon the number of hop-RTTs that a particular circuit type
  3018. undergoes. Additionally, launch intro circuits in parallel
  3019. if they timeout, and take the first one to reply as valid.
  3020. - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
  3021. separate error codes; or at least, don't break for that reason.
  3022. Fixes bug 7935. Reported by "oftc_must_be_destroyed".
  3023. - Update to the January 2 2013 Maxmind GeoLite Country database.
  3024. o Minor features (testing):
  3025. - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
  3026. (P-256) Diffie-Hellman handshakes to src/or/bench.
  3027. - Add benchmark functions to test onion handshake performance.
  3028. o Minor features (path bias detection):
  3029. - Alter the Path Bias log messages to be more descriptive in terms
  3030. of reporting timeouts and other statistics.
  3031. - Create three levels of Path Bias log messages, as opposed to just
  3032. two. These are configurable via consensus as well as via the torrc
  3033. options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
  3034. The default values are 0.70, 0.50, and 0.30 respectively.
  3035. - Separate the log message levels from the decision to drop guards,
  3036. which also is available via torrc option PathBiasDropGuards.
  3037. PathBiasDropGuards still defaults to 0 (off).
  3038. - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
  3039. in combination with PathBiasExtremeRate.
  3040. - Increase the default values for PathBiasScaleThreshold and
  3041. PathBiasCircThreshold from (200, 20) to (300, 150).
  3042. - Add in circuit usage accounting to path bias. If we try to use a
  3043. built circuit but fail for any reason, it counts as path bias.
  3044. Certain classes of circuits where the adversary gets to pick your
  3045. destination node are exempt from this accounting. Usage accounting
  3046. can be specifically disabled via consensus parameter or torrc.
  3047. - Convert all internal path bias state to double-precision floating
  3048. point, to avoid roundoff error and other issues.
  3049. - Only record path bias information for circuits that have completed
  3050. *two* hops. Assuming end-to-end tagging is the attack vector, this
  3051. makes us more resilient to ambient circuit failure without any
  3052. detection capability loss.
  3053. o Minor bugfixes (log messages):
  3054. - Rate-limit the "No circuits are opened. Relaxed timeout for a
  3055. circuit with channel state open..." message to once per hour to
  3056. keep it from filling the notice logs. Mitigates bug 7799 but does
  3057. not fix the underlying cause. Bugfix on 0.2.4.7-alpha.
  3058. - Avoid spurious warnings when configuring multiple client ports of
  3059. which only some are nonlocal. Previously, we had claimed that some
  3060. were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
  3061. 0.2.3.3-alpha.
  3062. o Code simplifications and refactoring:
  3063. - Get rid of a couple of harmless clang warnings, where we compared
  3064. enums to ints. These warnings are newly introduced in clang 3.2.
  3065. - Split the onion.c file into separate modules for the onion queue
  3066. and the different handshakes it supports.
  3067. - Remove the marshalling/unmarshalling code for sending requests to
  3068. cpuworkers over a socket, and instead just send structs. The
  3069. recipient will always be the same Tor binary as the sender, so
  3070. any encoding is overkill.
  3071. Changes in version 0.2.4.7-alpha - 2012-12-24
  3072. Tor 0.2.4.7-alpha introduces a new approach to providing fallback
  3073. directory mirrors for more robust bootstrapping; fixes more issues where
  3074. clients with changing network conditions refuse to make any circuits;
  3075. adds initial support for exiting to IPv6 addresses; resumes being able
  3076. to update our GeoIP database, and includes the geoip6 file this time;
  3077. turns off the client-side DNS cache by default due to privacy risks;
  3078. and fixes a variety of other issues.
  3079. o Major features (client resilience):
  3080. - Add a new "FallbackDir" torrc option to use when we can't use
  3081. a directory mirror from the consensus (either because we lack a
  3082. consensus, or because they're all down). Currently, all authorities
  3083. are fallbacks by default, and there are no other default fallbacks,
  3084. but that will change. This option will allow us to give clients a
  3085. longer list of servers to try to get a consensus from when first
  3086. connecting to the Tor network, and thereby reduce load on the
  3087. directory authorities. Implements proposal 206, "Preconfigured
  3088. directory sources for bootstrapping". We also removed the old
  3089. "FallbackNetworkstatus" option, since we never got it working well
  3090. enough to use it. Closes bug 572.
  3091. - If we have no circuits open, use a relaxed timeout (the
  3092. 95-percentile cutoff) until a circuit succeeds. This heuristic
  3093. should allow Tor to succeed at building circuits even when the
  3094. network connection drastically changes. Should help with bug 3443.
  3095. o Major features (IPv6):
  3096. - Relays can now exit to IPv6 addresses: make sure that you have IPv6
  3097. connectivity, then set the IPv6Exit flag to 1. Also make sure your
  3098. exit policy reads as you would like: the address * applies to all
  3099. address families, whereas *4 is IPv4 address only, and *6 is IPv6
  3100. addresses only. On the client side, you'll need to wait until the
  3101. authorities have upgraded, wait for enough exits to support IPv6,
  3102. apply the "IPv6Traffic" flag to a SocksPort, and use Socks5. Closes
  3103. ticket 5547, implements proposal 117 as revised in proposal 208.
  3104. We DO NOT recommend that clients with actual anonymity needs start
  3105. using IPv6 over Tor yet, since not enough exits support it yet.
  3106. o Major features (geoip database):
  3107. - Maxmind began labelling Tor relays as being in country "A1",
  3108. which breaks by-country node selection inside Tor. Now we use a
  3109. script to replace "A1" ("Anonymous Proxy") entries in our geoip
  3110. file with real country codes. This script fixes about 90% of "A1"
  3111. entries automatically and uses manual country code assignments to
  3112. fix the remaining 10%. See src/config/README.geoip for details.
  3113. Fixes bug 6266. Also update to the December 5 2012 Maxmind GeoLite
  3114. Country database, as modified above.
  3115. o Major bugfixes (client-side DNS):
  3116. - Turn off the client-side DNS cache by default. Updating and using
  3117. the DNS cache is now configurable on a per-client-port
  3118. level. SOCKSPort, DNSPort, etc lines may now contain
  3119. {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
  3120. cache these types of DNS answers when we receive them from an
  3121. exit node in response to an application request on this port, and
  3122. {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
  3123. cached DNS answers of these types, we shouldn't use them. It's
  3124. potentially risky to use cached DNS answers at the client, since
  3125. doing so can indicate to one exit what answers we've gotten
  3126. for DNS lookups in the past. With IPv6, this becomes especially
  3127. problematic. Using cached DNS answers for requests on the same
  3128. circuit would present less linkability risk, since all traffic
  3129. on a circuit is already linkable, but it would also provide
  3130. little performance benefit: the exit node caches DNS replies
  3131. too. Implements a simplified version of Proposal 205. Implements
  3132. ticket 7570.
  3133. o Major bugfixes (other):
  3134. - Alter circuit build timeout measurement to start at the point
  3135. where we begin the CREATE/CREATE_FAST step (as opposed to circuit
  3136. initialization). This should make our timeout measurements more
  3137. uniform. Previously, we were sometimes including ORconn setup time
  3138. in our circuit build time measurements. Should resolve bug 3443.
  3139. - Fix an assertion that could trigger in hibernate_go_dormant() when
  3140. closing an or_connection_t: call channel_mark_for_close() rather
  3141. than connection_mark_for_close(). Fixes bug 7267. Bugfix on
  3142. 0.2.4.4-alpha.
  3143. - Include the geoip6 IPv6 GeoIP database in the tarball. Fixes bug
  3144. 7655; bugfix on 0.2.4.6-alpha.
  3145. o Minor features:
  3146. - Add a new torrc option "ServerTransportListenAddr" to let bridge
  3147. operators select the address where their pluggable transports will
  3148. listen for connections. Resolves ticket 7013.
  3149. - Allow an optional $ before the node identity digest in the
  3150. controller command GETINFO ns/id/<identity>, for consistency with
  3151. md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
  3152. - Log packaged cell fullness as part of the heartbeat message.
  3153. Diagnosis to try to determine the extent of bug 7743.
  3154. o Minor features (IPv6):
  3155. - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
  3156. prefer to hand out virtual IPv6 addresses, since there are more of
  3157. them and we can't run out. To override this behavior and make IPv4
  3158. addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
  3159. or DNSPort you're using for resolving. Implements ticket 7571.
  3160. - AutomapHostsOnResolve responses are now randomized, to avoid
  3161. annoying situations where Tor is restarted and applications
  3162. connect to the wrong addresses.
  3163. - Never try more than 1000 times to pick a new virtual address when
  3164. AutomapHostsOnResolve is set. That's good enough so long as we
  3165. aren't close to handing out our entire virtual address space;
  3166. if you're getting there, it's best to switch to IPv6 virtual
  3167. addresses anyway.
  3168. o Minor bugfixes:
  3169. - The ADDRMAP command can no longer generate an ill-formed error
  3170. code on a failed MAPADDRESS. It now says "internal" rather than
  3171. an English sentence fragment with spaces in the middle. Bugfix on
  3172. Tor 0.2.0.19-alpha.
  3173. - Fix log messages and comments to avoid saying "GMT" when we mean
  3174. "UTC". Fixes bug 6113.
  3175. - Compile on win64 using mingw64. Fixes bug 7260; patches from
  3176. "yayooo".
  3177. - Fix a crash when debugging unit tests on Windows: deallocate a
  3178. shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
  3179. bugfix on 0.2.2.17-alpha. Reported by "ultramage".
  3180. o Renamed options:
  3181. - The DirServer option is now DirAuthority, for consistency with
  3182. current naming patterns. You can still use the old DirServer form.
  3183. o Code simplification and refactoring:
  3184. - Move the client-side address-map/virtual-address/DNS-cache code
  3185. out of connection_edge.c into a new addressmap.c module.
  3186. - Remove unused code for parsing v1 directories and "running routers"
  3187. documents. Fixes bug 6887.
  3188. Changes in version 0.2.3.25 - 2012-11-19
  3189. The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
  3190. Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
  3191. Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
  3192. programmer, and friend. Unstinting in his dedication to the cause of
  3193. freedom, he inspired and helped many of us as we began our work on
  3194. anonymity, and inspires us still. Please honor his memory by writing
  3195. software to protect people's freedoms, and by helping others to do so.
  3196. Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
  3197. significantly reduced directory overhead (via microdescriptors),
  3198. enormous crypto performance improvements for fast relays on new
  3199. enough hardware, a new v3 TLS handshake protocol that can better
  3200. resist fingerprinting, support for protocol obfuscation plugins (aka
  3201. pluggable transports), better scalability for hidden services, IPv6
  3202. support for bridges, performance improvements like allowing clients
  3203. to skip the first round-trip on the circuit ("optimistic data") and
  3204. refilling token buckets more often, a new "stream isolation" design
  3205. to isolate different applications on different circuits, and many
  3206. stability, security, and privacy fixes.
  3207. o Major bugfixes:
  3208. - Tor tries to wipe potentially sensitive data after using it, so
  3209. that if some subsequent security failure exposes Tor's memory,
  3210. the damage will be limited. But we had a bug where the compiler
  3211. was eliminating these wipe operations when it decided that the
  3212. memory was no longer visible to a (correctly running) program,
  3213. hence defeating our attempt at defense in depth. We fix that
  3214. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  3215. is unlikely to optimize away. Future versions of Tor may use
  3216. a less ridiculously heavy approach for this. Fixes bug 7352.
  3217. Reported in an article by Andrey Karpov.
  3218. o Minor bugfixes:
  3219. - Fix a harmless bug when opting against publishing a relay descriptor
  3220. because DisableNetwork is set. Fixes bug 7464; bugfix on
  3221. 0.2.3.9-alpha.
  3222. Changes in version 0.2.4.6-alpha - 2012-11-13
  3223. Tor 0.2.4.6-alpha fixes an assert bug that has been plaguing relays,
  3224. makes our defense-in-depth memory wiping more reliable, and begins to
  3225. count IPv6 addresses in bridge statistics,
  3226. o Major bugfixes:
  3227. - Fix an assertion failure that could occur when closing a connection
  3228. with a spliced rendezvous circuit. Fix for bug 7212; bugfix on
  3229. Tor 0.2.4.4-alpha.
  3230. - Tor tries to wipe potentially sensitive data after using it, so
  3231. that if some subsequent security failure exposes Tor's memory,
  3232. the damage will be limited. But we had a bug where the compiler
  3233. was eliminating these wipe operations when it decided that the
  3234. memory was no longer visible to a (correctly running) program,
  3235. hence defeating our attempt at defense in depth. We fix that
  3236. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  3237. is unlikely to optimize away. Future versions of Tor may use
  3238. a less ridiculously heavy approach for this. Fixes bug 7352.
  3239. Reported in an article by Andrey Karpov.
  3240. o Minor features:
  3241. - Add GeoIP database for IPv6 addresses. The new config option
  3242. is GeoIPv6File.
  3243. - Bridge statistics now count bridge clients connecting over IPv6:
  3244. bridge statistics files now list "bridge-ip-versions" and
  3245. extra-info documents list "geoip6-db-digest". The control protocol
  3246. "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
  3247. implementation by "shkoo", addressing ticket 5055.
  3248. o Minor bugfixes:
  3249. - Warn when we are binding low ports when hibernation is enabled;
  3250. previously we had warned when we were _advertising_ low ports with
  3251. hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
  3252. - Fix a harmless bug when opting against publishing a relay descriptor
  3253. because DisableNetwork is set. Fixes bug 7464; bugfix on
  3254. 0.2.3.9-alpha.
  3255. - Add warning message when a managed proxy dies during configuration.
  3256. Fixes bug 7195; bugfix on 0.2.4.2-alpha.
  3257. - Fix a linking error when building tor-fw-helper without miniupnp.
  3258. Fixes bug 7235; bugfix on 0.2.4.2-alpha. Fix by Anthony G. Basile.
  3259. - Check for closing an or_connection_t without going through correct
  3260. channel functions; emit a warning and then call
  3261. connection_or_close_for_error() so we don't assert as in bugs 7212
  3262. and 7267.
  3263. - Compile correctly on compilers without C99 designated initializer
  3264. support. Fixes bug 7286; bugfix on 0.2.4.4-alpha.
  3265. - Avoid a possible assert that can occur when channel_send_destroy() is
  3266. called on a channel in CHANNEL_STATE_CLOSING, CHANNEL_STATE_CLOSED,
  3267. or CHANNEL_STATE_ERROR when the Tor process is resumed after being
  3268. blocked for a long interval. Fixes bug 7350; bugfix on 0.2.4.4-alpha.
  3269. - Fix a memory leak on failing cases of channel_tls_process_certs_cell.
  3270. Fixes bug 7422; bugfix on 0.2.4.4-alpha.
  3271. o Code simplification and refactoring:
  3272. - Start using OpenBSD's implementation of queue.h, so that we don't
  3273. need to hand-roll our own pointer and list structures whenever we
  3274. need them. (We can't rely on a sys/queue.h, since some operating
  3275. systems don't have them, and the ones that do have them don't all
  3276. present the same extensions.)
  3277. Changes in version 0.2.4.5-alpha - 2012-10-25
  3278. Tor 0.2.4.5-alpha comes hard at the heels of 0.2.4.4-alpha, to fix
  3279. two important security vulnerabilities that could lead to remotely
  3280. triggerable relay crashes, fix a major bug that was preventing clients
  3281. from choosing suitable exit nodes, and refactor some of our code.
  3282. o Major bugfixes (security, also in 0.2.3.24-rc):
  3283. - Fix a group of remotely triggerable assertion failures related to
  3284. incorrect link protocol negotiation. Found, diagnosed, and fixed
  3285. by "some guy from France". Fix for CVE-2012-2250; bugfix on
  3286. 0.2.3.6-alpha.
  3287. - Fix a denial of service attack by which any directory authority
  3288. could crash all the others, or by which a single v2 directory
  3289. authority could crash everybody downloading v2 directory
  3290. information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
  3291. o Major bugfixes (also in 0.2.3.24-rc):
  3292. - When parsing exit policy summaries from microdescriptors, we had
  3293. previously been ignoring the last character in each one, so that
  3294. "accept 80,443,8080" would be treated by clients as indicating
  3295. a node that allows access to ports 80, 443, and 808. That would
  3296. lead to clients attempting connections that could never work,
  3297. and ignoring exit nodes that would support their connections. Now
  3298. clients parse these exit policy summaries correctly. Fixes bug 7192;
  3299. bugfix on 0.2.3.1-alpha.
  3300. o Minor bugfixes (also in 0.2.3.24-rc):
  3301. - Clients now consider the ClientRejectInternalAddresses config option
  3302. when using a microdescriptor consensus stanza to decide whether
  3303. an exit relay would allow exiting to an internal address. Fixes
  3304. bug 7190; bugfix on 0.2.3.1-alpha.
  3305. o Minor bugfixes:
  3306. - Only disable TLS session ticket support when running as a TLS
  3307. server. Now clients will blend better with regular Firefox
  3308. connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
  3309. o Code simplification and refactoring:
  3310. - Start using OpenBSD's implementation of queue.h (originally by
  3311. Niels Provos).
  3312. - Move the entry node code from circuitbuild.c to its own file.
  3313. - Move the circuit build timeout tracking code from circuitbuild.c
  3314. to its own file.
  3315. Changes in version 0.2.3.24-rc - 2012-10-25
  3316. Tor 0.2.3.24-rc fixes two important security vulnerabilities that
  3317. could lead to remotely triggerable relay crashes, and fixes
  3318. a major bug that was preventing clients from choosing suitable exit
  3319. nodes.
  3320. o Major bugfixes (security):
  3321. - Fix a group of remotely triggerable assertion failures related to
  3322. incorrect link protocol negotiation. Found, diagnosed, and fixed
  3323. by "some guy from France". Fix for CVE-2012-2250; bugfix on
  3324. 0.2.3.6-alpha.
  3325. - Fix a denial of service attack by which any directory authority
  3326. could crash all the others, or by which a single v2 directory
  3327. authority could crash everybody downloading v2 directory
  3328. information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
  3329. o Major bugfixes:
  3330. - When parsing exit policy summaries from microdescriptors, we had
  3331. previously been ignoring the last character in each one, so that
  3332. "accept 80,443,8080" would be treated by clients as indicating
  3333. a node that allows access to ports 80, 443, and 808. That would
  3334. lead to clients attempting connections that could never work,
  3335. and ignoring exit nodes that would support their connections. Now
  3336. clients parse these exit policy summaries correctly. Fixes bug 7192;
  3337. bugfix on 0.2.3.1-alpha.
  3338. o Minor bugfixes:
  3339. - Clients now consider the ClientRejectInternalAddresses config option
  3340. when using a microdescriptor consensus stanza to decide whether
  3341. an exit relay would allow exiting to an internal address. Fixes
  3342. bug 7190; bugfix on 0.2.3.1-alpha.
  3343. Changes in version 0.2.4.4-alpha - 2012-10-20
  3344. Tor 0.2.4.4-alpha adds a new v3 directory authority, fixes a privacy
  3345. vulnerability introduced by a change in OpenSSL, fixes a remotely
  3346. triggerable assert, and adds new channel_t and circuitmux_t abstractions
  3347. that will make it easier to test new connection transport and cell
  3348. scheduling algorithms.
  3349. o New directory authorities (also in 0.2.3.23-rc):
  3350. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  3351. authority. Closes ticket 5749.
  3352. o Major bugfixes (security/privacy, also in 0.2.3.23-rc):
  3353. - Disable TLS session tickets. OpenSSL's implementation was giving
  3354. our TLS session keys the lifetime of our TLS context objects, when
  3355. perfect forward secrecy would want us to discard anything that
  3356. could decrypt a link connection as soon as the link connection
  3357. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  3358. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  3359. - Discard extraneous renegotiation attempts once the V3 link
  3360. protocol has been initiated. Failure to do so left us open to
  3361. a remotely triggerable assertion failure. Fixes CVE-2012-2249;
  3362. bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
  3363. o Internal abstraction features:
  3364. - Introduce new channel_t abstraction between circuits and
  3365. or_connection_t to allow for implementing alternate OR-to-OR
  3366. transports. A channel_t is an abstract object which can either be a
  3367. cell-bearing channel, which is responsible for authenticating and
  3368. handshaking with the remote OR and transmitting cells to and from
  3369. it, or a listening channel, which spawns new cell-bearing channels
  3370. at the request of remote ORs. Implements part of ticket 6465.
  3371. - Also new is the channel_tls_t subclass of channel_t, adapting it
  3372. to the existing or_connection_t code. The V2/V3 protocol handshaking
  3373. code which formerly resided in command.c has been moved below the
  3374. channel_t abstraction layer and may be found in channeltls.c now.
  3375. Implements the rest of ticket 6465.
  3376. - Introduce new circuitmux_t storing the queue of circuits for
  3377. a channel; this encapsulates and abstracts the queue logic and
  3378. circuit selection policy, and allows the latter to be overridden
  3379. easily by switching out a policy object. The existing EWMA behavior
  3380. is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
  3381. o Required libraries:
  3382. - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
  3383. strongly recommended.
  3384. o Minor features:
  3385. - Warn users who run hidden services on a Tor client with
  3386. UseEntryGuards disabled that their hidden services will be
  3387. vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
  3388. attack which motivated Tor to support entry guards in the first
  3389. place). Resolves ticket 6889.
  3390. - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
  3391. dhill. Resolves ticket 6982.
  3392. - Option OutboundBindAddress can be specified multiple times and
  3393. accepts IPv6 addresses. Resolves ticket 6876.
  3394. o Minor bugfixes (also in 0.2.3.23-rc):
  3395. - Don't serve or accept v2 hidden service descriptors over a
  3396. relay's DirPort. It's never correct to do so, and disabling it
  3397. might make it more annoying to exploit any bugs that turn up in the
  3398. descriptor-parsing code. Fixes bug 7149.
  3399. - Fix two cases in src/or/transports.c where we were calling
  3400. fmt_addr() twice in a parameter list. Bug found by David
  3401. Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
  3402. - Fix memory leaks whenever we logged any message about the "path
  3403. bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
  3404. - When relays refuse a "create" cell because their queue of pending
  3405. create cells is too big (typically because their cpu can't keep up
  3406. with the arrival rate), send back reason "resource limit" rather
  3407. than reason "internal", so network measurement scripts can get a
  3408. more accurate picture. Fixes bug 7037; bugfix on 0.1.1.11-alpha.
  3409. o Minor bugfixes:
  3410. - Command-line option "--version" implies "--quiet". Fixes bug 6997.
  3411. - Free some more still-in-use memory at exit, to make hunting for
  3412. memory leaks easier. Resolves bug 7029.
  3413. - When a Tor client gets a "truncated" relay cell, the first byte of
  3414. its payload specifies why the circuit was truncated. We were
  3415. ignoring this 'reason' byte when tearing down the circuit, resulting
  3416. in the controller not being told why the circuit closed. Now we
  3417. pass the reason from the truncated cell to the controller. Bugfix
  3418. on 0.1.2.3-alpha; fixes bug 7039.
  3419. - Downgrade "Failed to hand off onionskin" messages to "debug"
  3420. severity, since they're typically redundant with the "Your computer
  3421. is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
  3422. - Make clients running with IPv6 bridges connect over IPv6 again,
  3423. even without setting new config options ClientUseIPv6 and
  3424. ClientPreferIPv6ORPort. Fixes bug 6757; bugfix on 0.2.4.1-alpha.
  3425. - Use square brackets around IPv6 addresses in numerous places
  3426. that needed them, including log messages, HTTPS CONNECT proxy
  3427. requests, TransportProxy statefile entries, and pluggable transport
  3428. extra-info lines. Fixes bug 7011; patch by David Fifield.
  3429. o Code refactoring and cleanup:
  3430. - Source files taken from other packages now reside in src/ext;
  3431. previously they were scattered around the rest of Tor.
  3432. - Avoid use of reserved identifiers in our C code. The C standard
  3433. doesn't like us declaring anything that starts with an
  3434. underscore, so let's knock it off before we get in trouble. Fix
  3435. for bug 1031; bugfix on the first Tor commit.
  3436. Changes in version 0.2.3.23-rc - 2012-10-20
  3437. Tor 0.2.3.23-rc adds a new v3 directory authority, fixes a privacy
  3438. vulnerability introduced by a change in OpenSSL, and fixes a variety
  3439. of smaller bugs in preparation for the release.
  3440. o New directory authorities:
  3441. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  3442. authority. Closes ticket 5749.
  3443. o Major bugfixes (security/privacy):
  3444. - Disable TLS session tickets. OpenSSL's implementation was giving
  3445. our TLS session keys the lifetime of our TLS context objects, when
  3446. perfect forward secrecy would want us to discard anything that
  3447. could decrypt a link connection as soon as the link connection
  3448. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  3449. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  3450. - Discard extraneous renegotiation attempts once the V3 link
  3451. protocol has been initiated. Failure to do so left us open to
  3452. a remotely triggerable assertion failure. Fixes CVE-2012-2249;
  3453. bugfix on 0.2.3.6-alpha. Reported by "some guy from France".
  3454. o Major bugfixes:
  3455. - Fix a possible crash bug when checking for deactivated circuits
  3456. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  3457. bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
  3458. o Minor bugfixes (on 0.2.3.x):
  3459. - Fix two cases in src/or/transports.c where we were calling
  3460. fmt_addr() twice in a parameter list. Bug found by David
  3461. Fifield. Fixes bug 7014; bugfix on 0.2.3.9-alpha.
  3462. - Convert an assert in the pathbias code to a log message. The assert
  3463. appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
  3464. bugfix on 0.2.3.17-beta.
  3465. - Fix memory leaks whenever we logged any message about the "path
  3466. bias" detection. Fixes bug 7022; bugfix on 0.2.3.21-rc.
  3467. o Minor bugfixes (on 0.2.2.x and earlier):
  3468. - Don't serve or accept v2 hidden service descriptors over a relay's
  3469. DirPort. It's never correct to do so, and disabling it might
  3470. make it more annoying to exploit any bugs that turn up in the
  3471. descriptor-parsing code. Fixes bug 7149.
  3472. - When relays refuse a "create" cell because their queue of pending
  3473. create cells is too big (typically because their cpu can't keep up
  3474. with the arrival rate), send back reason "resource limit" rather
  3475. than reason "internal", so network measurement scripts can get a
  3476. more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
  3477. - Correct file sizes when reading binary files on Cygwin, to avoid
  3478. a bug where Tor would fail to read its state file. Fixes bug 6844;
  3479. bugfix on 0.1.2.7-alpha.
  3480. - Avoid undefined behaviour when parsing the list of supported
  3481. rendezvous/introduction protocols in a hidden service descriptor.
  3482. Previously, Tor would have confused (as-yet-unused) protocol version
  3483. numbers greater than 32 with lower ones on many platforms. Fixes
  3484. bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
  3485. o Documentation fixes:
  3486. - Clarify that hidden services are TCP only. Fixes bug 6024.
  3487. Changes in version 0.2.4.3-alpha - 2012-09-22
  3488. Tor 0.2.4.3-alpha fixes another opportunity for a remotely triggerable
  3489. assertion, resumes letting relays test reachability of their DirPort,
  3490. and cleans up a bunch of smaller bugs.
  3491. o Security fixes:
  3492. - Fix an assertion failure in tor_timegm() that could be triggered
  3493. by a badly formatted directory object. Bug found by fuzzing with
  3494. Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
  3495. o Major bugfixes:
  3496. - Fix a possible crash bug when checking for deactivated circuits
  3497. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  3498. bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
  3499. - Allow routers to detect that their own DirPorts are running. When
  3500. we removed support for versions_supports_begindir, we also
  3501. accidentally removed the mechanism we used to self-test our
  3502. DirPort. Diagnosed with help from kargig. Fixes bugs 6814 and 6815;
  3503. bugfix on 0.2.4.2-alpha.
  3504. o Security features:
  3505. - Switch to a completely time-invariant approach for picking nodes
  3506. weighted by bandwidth. Our old approach would run through the
  3507. part of the loop after it had made its choice slightly slower
  3508. than it ran through the part of the loop before it had made its
  3509. choice. Addresses ticket 6538.
  3510. - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
  3511. by tor2web clients allows hidden services to identify tor2web
  3512. clients through their repeated selection of the same rendezvous
  3513. and introduction point circuit endpoints (their guards). Resolves
  3514. ticket 6888.
  3515. o Minor features:
  3516. - Enable Tor to read configuration, state, and key information from
  3517. a FIFO. Previously Tor would only read from files with a positive
  3518. stat.st_size. Code from meejah; fixes bug 6044.
  3519. o Minor bugfixes:
  3520. - Correct file sizes when reading binary files on Cygwin, to avoid
  3521. a bug where Tor would fail to read its state file. Fixes bug 6844;
  3522. bugfix on 0.1.2.7-alpha.
  3523. - Correctly handle votes with more than 31 flags. Fixes bug 6853;
  3524. bugfix on 0.2.0.3-alpha.
  3525. - When complaining about a client port on a public address, log
  3526. which address we're complaining about. Fixes bug 4020; bugfix on
  3527. 0.2.3.3-alpha. Patch by Tom Fitzhenry.
  3528. - Convert an assert in the pathbias code to a log message. The assert
  3529. appears to only be triggerable by Tor2Web mode. Fixes bug 6866;
  3530. bugfix on 0.2.3.17-beta.
  3531. - Our new buildsystem was overzealous about rebuilding manpages: it
  3532. would rebuild them all whenever any one of them changed. Now our
  3533. dependency checking should be correct. Fixes bug 6843; bugfix on
  3534. 0.2.4.1-alpha.
  3535. - Don't do reachability testing over IPv6 unless AuthDirPublishIPv6
  3536. is set. Fixes bug 6880. Bugfix on 0.2.4.1-alpha.
  3537. - Correct log printout about which address family is preferred
  3538. when connecting to a bridge with both an IPv4 and IPv6 OR port.
  3539. Fixes bug 6884; bugfix on 0.2.4.1-alpha.
  3540. o Minor bugfixes (code cleanliness):
  3541. - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
  3542. with large values. This situation was untriggered, but nevertheless
  3543. incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
  3544. - Reject consensus votes with more than 64 known-flags. We aren't even
  3545. close to that limit yet, and our code doesn't handle it correctly.
  3546. Fixes bug 6833; bugfix on 0.2.0.1-alpha.
  3547. - Avoid undefined behaviour when parsing the list of supported
  3548. rendezvous/introduction protocols in a hidden service descriptor.
  3549. Previously, Tor would have confused (as-yet-unused) protocol version
  3550. numbers greater than 32 with lower ones on many platforms. Fixes
  3551. bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
  3552. - Fix handling of rendezvous client authorization types over 8.
  3553. Fixes bug 6861; bugfix on 0.2.1.5-alpha.
  3554. - Fix building with older versions of GCC (2.95, for one) that don't
  3555. like preprocessor directives inside macro arguments. Found by
  3556. grarpamp. Fixes bug 6842; bugfix on 0.2.4.2-alpha.
  3557. - Switch weighted node selection rule from using a list of doubles
  3558. to using a list of int64_t. This change should make the process
  3559. slightly easier to debug and maintain. Needed to finish ticket 6538.
  3560. o Code simplification and refactoring:
  3561. - Move the generic "config" code into a new file, and have "config.c"
  3562. hold only torrc- and state-related code. Resolves ticket 6823.
  3563. - Move the core of our "choose a weighted element at random" logic
  3564. into its own function, and give it unit tests. Now the logic is
  3565. testable, and a little less fragile too.
  3566. - Removed the testing_since field of node_t, which hasn't been used
  3567. for anything since 0.2.0.9-alpha.
  3568. o Documentation fixes:
  3569. - Clarify that hidden services are TCP only. Fixes bug 6024.
  3570. - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
  3571. 0.2.3.14-alpha.
  3572. Changes in version 0.2.3.22-rc - 2012-09-11
  3573. Tor 0.2.3.22-rc fixes another opportunity for a remotely triggerable
  3574. assertion.
  3575. o Security fixes:
  3576. - Fix an assertion failure in tor_timegm() that could be triggered
  3577. by a badly formatted directory object. Bug found by fuzzing with
  3578. Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
  3579. o Minor bugfixes:
  3580. - Avoid segfault when starting up having run with an extremely old
  3581. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  3582. on 0.2.2.23-alpha.
  3583. Changes in version 0.2.2.39 - 2012-09-11
  3584. Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
  3585. assertions.
  3586. o Security fixes:
  3587. - Fix an assertion failure in tor_timegm() that could be triggered
  3588. by a badly formatted directory object. Bug found by fuzzing with
  3589. Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
  3590. - Do not crash when comparing an address with port value 0 to an
  3591. address policy. This bug could have been used to cause a remote
  3592. assertion failure by or against directory authorities, or to
  3593. allow some applications to crash clients. Fixes bug 6690; bugfix
  3594. on 0.2.1.10-alpha.
  3595. Changes in version 0.2.4.2-alpha - 2012-09-10
  3596. Tor 0.2.4.2-alpha enables port forwarding for pluggable transports,
  3597. raises the default rate limiting even more, and makes the bootstrapping
  3598. log messages less noisy.
  3599. o Major features:
  3600. - Automatically forward the TCP ports of pluggable transport
  3601. proxies using tor-fw-helper if PortForwarding is enabled. Implements
  3602. ticket 4567.
  3603. o Major bugfixes:
  3604. - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
  3605. to 1GB/1GB. The previous defaults were intended to be "basically
  3606. infinite", but it turns out they're now limiting our 100mbit+
  3607. relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
  3608. last time we raised it).
  3609. o Minor features:
  3610. - Detect when we're running with a version of OpenSSL other than the
  3611. one we compiled with. This has occasionally given people hard-to-
  3612. track-down errors.
  3613. - Log fewer lines at level "notice" about our OpenSSL and Libevent
  3614. versions and capabilities when everything is going right. Resolves
  3615. part of ticket 6736.
  3616. - Directory authorities no long accept descriptors for any version of
  3617. Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
  3618. These versions are insecure, unsupported, or both. Implements
  3619. ticket 6789.
  3620. o Minor bugfixes:
  3621. - Rename the (internal-use-only) UsingTestingNetworkDefaults option
  3622. to start with a triple-underscore so the controller won't touch it.
  3623. Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
  3624. - Avoid segfault when starting up having run with an extremely old
  3625. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  3626. on 0.2.2.23-alpha.
  3627. - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
  3628. so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
  3629. - Don't follow the NULL pointer if microdescriptor generation fails.
  3630. (This does not appear to be triggerable, but it's best to be safe.)
  3631. Found by "f. tp.". Fixes bug 6797; bugfix on 0.2.4.1-alpha.
  3632. - Fix mis-declared dependencies on src/common/crypto.c and
  3633. src/or/tor_main.c that could break out-of-tree builds under some
  3634. circumstances. Fixes bug 6778; bugfix on 0.2.4.1-alpha.
  3635. - Avoid a warning when building common_sha1.i out of tree. Fixes bug
  3636. 6778; bugfix on 0.2.4.1-alpha.
  3637. - Fix a harmless (in this case) build warning for implicitly
  3638. converting a strlen() to an int. Bugfix on 0.2.4.1-alpha.
  3639. o Removed features:
  3640. - Now that all versions before 0.2.2.x are disallowed, we no longer
  3641. need to work around their missing features. Thus we can remove a
  3642. bunch of compatibility code.
  3643. o Code refactoring:
  3644. - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
  3645. TCP ports to forward. In the past it only accepted two ports:
  3646. the ORPort and the DirPort.
  3647. Changes in version 0.2.4.1-alpha - 2012-09-05
  3648. Tor 0.2.4.1-alpha lets bridges publish their pluggable transports to
  3649. bridgedb; lets relays use IPv6 addresses and directory authorities
  3650. advertise them; and switches to a cleaner build interface.
  3651. This is the first alpha release in a new series, so expect there to
  3652. be bugs. Users who would rather test out a more stable branch should
  3653. stay with 0.2.3.x for now.
  3654. o Major features (bridges):
  3655. - Bridges now report the pluggable transports they support to the
  3656. bridge authority, so it can pass the supported transports on to
  3657. bridgedb and/or eventually do reachability testing. Implements
  3658. ticket 3589.
  3659. o Major features (IPv6):
  3660. - Bridge authorities now accept IPv6 bridge addresses and include
  3661. them in network status documents. Implements ticket 5534.
  3662. - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
  3663. IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
  3664. to happen. Implements ticket 5535.
  3665. - All kind of relays, not just bridges, can now advertise an IPv6
  3666. OR port. Implements ticket 6362.
  3667. - Directory authorities vote on IPv6 OR ports using the new consensus
  3668. method 14. Implements ticket 6363.
  3669. o Major features (build):
  3670. - Switch to a nonrecursive Makefile structure. Now instead of each
  3671. Makefile.am invoking other Makefile.am's, there is a master
  3672. Makefile.am that includes the others. This change makes our build
  3673. process slightly more maintainable, and improves parallelism for
  3674. building with make -j. Original patch by Stewart Smith; various
  3675. fixes by Jim Meyering.
  3676. - Where available, we now use automake's "silent" make rules by
  3677. default, so that warnings are easier to spot. You can get the old
  3678. behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
  3679. o Minor features (code security and spec conformance):
  3680. - Clear keys and key-derived material left on the stack in
  3681. rendservice.c and rendclient.c. Check return value of
  3682. crypto_pk_write_private_key_to_string() in rend_service_load_keys().
  3683. These fixes should make us more forward-secure against cold-boot
  3684. attacks and the like. Fixes bug 2385.
  3685. - Reject EXTEND cells sent to nonexistent streams. According to the
  3686. spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
  3687. we were only checking for stream IDs that were currently in use.
  3688. Found while hunting for more instances of bug 6271. Bugfix on
  3689. 0.0.2pre8, which introduced incremental circuit construction.
  3690. o Minor features (streamlining);
  3691. - No longer include the "opt" prefix when generating routerinfos
  3692. or v2 directories: it has been needless since Tor 0.1.2. Closes
  3693. ticket 5124.
  3694. - Remove some now-needless code that tried to aggressively flush
  3695. OR connections as data was added to them. Since 0.2.0.1-alpha, our
  3696. cell queue logic has saved us from the failure mode that this code
  3697. was supposed to prevent. Removing this code will limit the number
  3698. of baroque control flow paths through Tor's network logic. Reported
  3699. pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
  3700. o Minor features (controller):
  3701. - Add a "GETINFO signal/names" control port command. Implements
  3702. ticket 3842.
  3703. - Provide default values for all options via "GETINFO config/defaults".
  3704. Implements ticket 4971.
  3705. o Minor features (IPv6):
  3706. - New config option "AuthDirHasIPv6Connectivity 1" that directory
  3707. authorities should set if they have IPv6 connectivity and want to
  3708. do reachability tests for IPv6 relays. Implements feature 5974.
  3709. - A relay with an IPv6 OR port now sends that address in NETINFO
  3710. cells (in addition to its other address). Implements ticket 6364.
  3711. o Minor features (log messages):
  3712. - Omit the first heartbeat log message, because it never has anything
  3713. useful to say, and it clutters up the bootstrapping messages.
  3714. Resolves ticket 6758.
  3715. - Don't log about reloading the microdescriptor cache at startup. Our
  3716. bootstrap warnings are supposed to tell the user when there's a
  3717. problem, and our bootstrap notices say when there isn't. Resolves
  3718. ticket 6759; bugfix on 0.2.2.6-alpha.
  3719. - Don't log "I learned some more directory information" when we're
  3720. reading cached directory information. Reserve it for when new
  3721. directory information arrives in response to a fetch. Resolves
  3722. ticket 6760.
  3723. - Prevent rounding error in path bias counts when scaling
  3724. them down, and use the correct scale factor default. Also demote
  3725. some path bias related log messages down a level and make others
  3726. less scary sounding. Fixes bug 6647. Bugfix against 0.2.3.17-beta.
  3727. - We no longer warn so much when generating manpages from their
  3728. asciidoc source.
  3729. o Code simplifications and refactoring:
  3730. - Enhance our internal sscanf replacement so that we can eliminate
  3731. the last remaining uses of the system sscanf. (Though those uses
  3732. of sscanf were safe, sscanf itself is generally error prone, so
  3733. we want to eliminate when we can.) Fixes ticket 4195 and Coverity
  3734. CID 448.
  3735. - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
  3736. - Move last_reachable and testing_since from routerinfo_t to node_t.
  3737. Implements ticket 5529.
  3738. - Add replaycache_t structure, functions and unit tests, then refactor
  3739. rend_service_introduce() to be more clear to read, improve, debug,
  3740. and test. Resolves bug 6177.
  3741. - Finally remove support for malloc_good_size and malloc_usable_size.
  3742. We had hoped that these functions would let us eke a little more
  3743. memory out of our malloc implementation. Unfortunately, the only
  3744. implementations that provided these functions are also ones that
  3745. are already efficient about not overallocation: they never got us
  3746. more than 7 or so bytes per allocation. Removing them saves us a
  3747. little code complexity and a nontrivial amount of build complexity.
  3748. o New requirements:
  3749. - Tor maintainers now require Automake version 1.9 or later to build
  3750. Tor from the Git repository. (Automake is not required when building
  3751. from a source distribution.)
  3752. Changes in version 0.2.3.21-rc - 2012-09-05
  3753. Tor 0.2.3.21-rc is the fourth release candidate for the Tor 0.2.3.x
  3754. series. It fixes a trio of potential security bugs, fixes a bug where
  3755. we were leaving some of the fast relays out of the microdescriptor
  3756. consensus, resumes interpreting "ORPort 0" and "DirPort 0" correctly,
  3757. and cleans up other smaller issues.
  3758. o Major bugfixes (security):
  3759. - Tear down the circuit if we get an unexpected SENDME cell. Clients
  3760. could use this trick to make their circuits receive cells faster
  3761. than our flow control would have allowed, or to gum up the network,
  3762. or possibly to do targeted memory denial-of-service attacks on
  3763. entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
  3764. from July 2002, before the release of Tor 0.0.0. We had committed
  3765. this patch previously, but we had to revert it because of bug 6271.
  3766. Now that 6271 is fixed, this patch appears to work.
  3767. - Reject any attempt to extend to an internal address. Without
  3768. this fix, a router could be used to probe addresses on an internal
  3769. network to see whether they were accepting connections. Fixes bug
  3770. 6710; bugfix on 0.0.8pre1.
  3771. - Do not crash when comparing an address with port value 0 to an
  3772. address policy. This bug could have been used to cause a remote
  3773. assertion failure by or against directory authorities, or to
  3774. allow some applications to crash clients. Fixes bug 6690; bugfix
  3775. on 0.2.1.10-alpha.
  3776. o Major bugfixes:
  3777. - Remove the upper bound on microdescriptor length. We were hitting
  3778. the limit for routers with complex exit policies or family
  3779. declarations, causing clients to not use them. Fixes the first
  3780. piece of bug 6404; fix on 0.2.2.6-alpha.
  3781. - Detect "ORPort 0" as meaning, uniformly, that we're not running
  3782. as a relay. Previously, some of our code would treat the presence
  3783. of any ORPort line as meaning that we should act like a relay,
  3784. even though our new listener code would correctly not open any
  3785. ORPorts for ORPort 0. Similar bugs in other Port options are also
  3786. fixed. Fixes the first half of bug 6507; bugfix on 0.2.3.3-alpha.
  3787. o Minor bugfixes:
  3788. - Avoid a pair of double-free and use-after-mark bugs that can
  3789. occur with certain timings in canceled and re-received DNS
  3790. requests. Fixes bug 6472; bugfix on 0.0.7rc1.
  3791. - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
  3792. Fixes bug 6379. Bugfix on 0.2.0.20-rc.
  3793. - Allow one-hop directory fetching circuits the full "circuit build
  3794. timeout" period, rather than just half of it, before failing them
  3795. and marking the relay down. This fix should help reduce cases where
  3796. clients declare relays (or worse, bridges) unreachable because
  3797. the TLS handshake takes a few seconds to complete. Fixes bug 6743;
  3798. bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
  3799. 30 seconds.
  3800. - Authorities no longer include any router in their microdescriptor
  3801. consensuses for which they couldn't generate or agree on a
  3802. microdescriptor. Fixes the second piece of bug 6404; fix on
  3803. 0.2.2.6-alpha.
  3804. - Detect and reject attempts to specify both "FooPort" and
  3805. "FooPort 0" in the same configuration domain. (It's still okay
  3806. to have a FooPort in your configuration file, and use "FooPort 0"
  3807. on the command line to disable it.) Fixes the second half of bug
  3808. 6507; bugfix on 0.2.3.3-alpha.
  3809. - Make wildcarded addresses (that is, ones beginning with "*.") work
  3810. when provided via the controller's MapAddress command. Previously,
  3811. they were accepted, but we never actually noticed that they were
  3812. wildcards. Fixes bug 6244; bugfix on 0.2.3.9-alpha.
  3813. - Avoid crashing on a malformed state file where EntryGuardPathBias
  3814. precedes EntryGuard. Fix for bug 6774; bugfix on 0.2.3.17-beta.
  3815. - Add a (probably redundant) memory clear between iterations of
  3816. the router status voting loop, to prevent future coding errors
  3817. where data might leak between iterations of the loop. Resolves
  3818. ticket 6514.
  3819. o Minor bugfixes (log messages):
  3820. - Downgrade "set buildtimeout to low value" messages to "info"
  3821. severity; they were never an actual problem, there was never
  3822. anything reasonable to do about them, and they tended to spam logs
  3823. from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
  3824. - Downgrade path-bias warning messages to "info". We'll try to get
  3825. them working better in 0.2.4. Add internal circuit construction
  3826. state to protect against the noisy warn message "Unexpectedly high
  3827. circuit_successes". Also add some additional rate-limited notice
  3828. messages to help determine the root cause of the warn. Fixes bug
  3829. 6475. Bugfix against 0.2.3.17-beta.
  3830. - Move log message when unable to find a microdesc in a routerstatus
  3831. entry to parse time. Previously we'd spam this warning every time
  3832. we tried to figure out which microdescriptors to download. Fixes
  3833. the third piece of bug 6404; fix on 0.2.3.18-rc.
  3834. o Minor features:
  3835. - Consider new, removed or changed IPv6 OR ports a non-cosmetic
  3836. change when the authority is deciding whether to accept a newly
  3837. uploaded descriptor. Implements ticket 6423.
  3838. - Add missing documentation for consensus and microdesc files.
  3839. Resolves ticket 6732.
  3840. Changes in version 0.2.2.38 - 2012-08-12
  3841. Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
  3842. attack that could in theory leak path information.
  3843. o Security fixes:
  3844. - Avoid an uninitialized memory read when reading a vote or consensus
  3845. document that has an unrecognized flavor name. This read could
  3846. lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
  3847. - Try to leak less information about what relays a client is
  3848. choosing to a side-channel attacker. Previously, a Tor client would
  3849. stop iterating through the list of available relays as soon as it
  3850. had chosen one, thus finishing a little earlier when it picked
  3851. a router earlier in the list. If an attacker can recover this
  3852. timing information (nontrivial but not proven to be impossible),
  3853. they could learn some coarse-grained information about which relays
  3854. a client was picking (middle nodes in particular are likelier to
  3855. be affected than exits). The timing attack might be mitigated by
  3856. other factors (see bug 6537 for some discussion), but it's best
  3857. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  3858. Changes in version 0.2.3.20-rc - 2012-08-05
  3859. Tor 0.2.3.20-rc is the third release candidate for the Tor 0.2.3.x
  3860. series. It fixes a pair of code security bugs and a potential anonymity
  3861. issue, updates our RPM spec files, and cleans up other smaller issues.
  3862. o Security fixes:
  3863. - Avoid read-from-freed-memory and double-free bugs that could occur
  3864. when a DNS request fails while launching it. Fixes bug 6480;
  3865. bugfix on 0.2.0.1-alpha.
  3866. - Avoid an uninitialized memory read when reading a vote or consensus
  3867. document that has an unrecognized flavor name. This read could
  3868. lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
  3869. - Try to leak less information about what relays a client is
  3870. choosing to a side-channel attacker. Previously, a Tor client would
  3871. stop iterating through the list of available relays as soon as it
  3872. had chosen one, thus finishing a little earlier when it picked
  3873. a router earlier in the list. If an attacker can recover this
  3874. timing information (nontrivial but not proven to be impossible),
  3875. they could learn some coarse-grained information about which relays
  3876. a client was picking (middle nodes in particular are likelier to
  3877. be affected than exits). The timing attack might be mitigated by
  3878. other factors (see bug 6537 for some discussion), but it's best
  3879. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  3880. o Minor features:
  3881. - Try to make the warning when giving an obsolete SOCKSListenAddress
  3882. a little more useful.
  3883. - Terminate active server managed proxies if Tor stops being a
  3884. relay. Addresses parts of bug 6274; bugfix on 0.2.3.6-alpha.
  3885. - Provide a better error message about possible OSX Asciidoc failure
  3886. reasons. Fixes bug 6436.
  3887. - Warn when Tor is configured to use accounting in a way that can
  3888. link a hidden service to some other hidden service or public
  3889. address. Resolves ticket 6490.
  3890. o Minor bugfixes:
  3891. - Check return value of fputs() when writing authority certificate
  3892. file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
  3893. - Ignore ServerTransportPlugin lines when Tor is not configured as
  3894. a relay. Fixes bug 6274; bugfix on 0.2.3.6-alpha.
  3895. - When disabling guards for having too high a proportion of failed
  3896. circuits, make sure to look at each guard. Fixes bug 6397; bugfix
  3897. on 0.2.3.17-beta.
  3898. o Packaging (RPM):
  3899. - Update our default RPM spec files to work with mock and rpmbuild
  3900. on RHEL/Fedora. They have an updated set of dependencies and
  3901. conflicts, a fix for an ancient typo when creating the "_tor"
  3902. user, and better instructions. Thanks to Ondrej Mikle for the
  3903. patch series. Fixes bug 6043.
  3904. o Testing:
  3905. - Make it possible to set the TestingTorNetwork configuration
  3906. option using AlternateDirAuthority and AlternateBridgeAuthority
  3907. as an alternative to setting DirServer. Addresses ticket 6377.
  3908. o Documentation:
  3909. - Clarify the documentation for the Alternate*Authority options.
  3910. Fixes bug 6387.
  3911. - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
  3912. o Code simplification and refactoring:
  3913. - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
  3914. 10 lines. Also, don't nest them. Doing so in the past has
  3915. led to hard-to-debug code. The new style is to use the
  3916. SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
  3917. Changes in version 0.2.3.19-rc - 2012-07-06
  3918. Tor 0.2.3.19-rc is the second release candidate for the Tor 0.2.3.x
  3919. series. It fixes the compile on Windows, reverts to a GeoIP database
  3920. that isn't as broken, and fixes a flow control bug that has been around
  3921. since the beginning of Tor.
  3922. o Major bugfixes:
  3923. - Fix a bug handling SENDME cells on nonexistent streams that could
  3924. result in bizarre window values. Report and patch contributed
  3925. pseudonymously. Fixes part of bug 6271. This bug was introduced
  3926. before the first Tor release, in svn commit r152.
  3927. - Revert to the May 1 2012 Maxmind GeoLite Country database. In the
  3928. June 2012 database, Maxmind marked many Tor relays as country "A1",
  3929. which will cause risky behavior for clients that set EntryNodes
  3930. or ExitNodes. Addresses bug 6334; bugfix on 0.2.3.17-beta.
  3931. - Instead of ENOBUFS on Windows, say WSAENOBUFS. Fixes compilation
  3932. on Windows. Fixes bug 6296; bugfix on 0.2.3.18-rc.
  3933. o Minor bugfixes:
  3934. - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
  3935. bugfix on 0.2.1.10-alpha.
  3936. Changes in version 0.2.3.18-rc - 2012-06-28
  3937. Tor 0.2.3.18-rc is the first release candidate for the Tor 0.2.3.x
  3938. series. It fixes a few smaller bugs, but generally appears stable.
  3939. Please test it and let us know whether it is!
  3940. o Major bugfixes:
  3941. - Allow wildcarded mapaddress targets to be specified on the
  3942. controlport. Partially fixes bug 6244; bugfix on 0.2.3.9-alpha.
  3943. - Make our linker option detection code more robust against linkers
  3944. such as on FreeBSD 8, where a bad combination of options completes
  3945. successfully but makes an unrunnable binary. Fixes bug 6173;
  3946. bugfix on 0.2.3.17-beta.
  3947. o Minor bugfixes (on 0.2.2.x and earlier):
  3948. - Avoid a false positive in the util/threads unit test by increasing
  3949. the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
  3950. - Replace "Sending publish request" log messages with "Launching
  3951. upload", so that they no longer confusingly imply that we're
  3952. sending something to a directory we might not even be connected
  3953. to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
  3954. - Make sure to set *socket_error in all error cases in
  3955. connection_connect(), so it can't produce a warning about
  3956. errno being zero from errno_to_orconn_end_reason(). Bugfix on
  3957. 0.2.1.1-alpha; resolves ticket 6028.
  3958. - Downgrade "Got a certificate, but we already have it" log messages
  3959. from warning to info, except when we're a dirauth. Fixes bug 5238;
  3960. bugfix on 0.2.1.7-alpha.
  3961. - When checking for requested signatures on the latest consensus
  3962. before serving it to a client, make sure to check the right
  3963. consensus flavor. Bugfix on 0.2.2.6-alpha.
  3964. - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
  3965. Fixes bug 5932; bugfix on 0.2.2.7-alpha.
  3966. o Minor bugfixes (on 0.2.3.x):
  3967. - Make format_helper_exit_status() avoid unnecessary space padding
  3968. and stop confusing log_from_pipe(). Fixes ticket 5557; bugfix
  3969. on 0.2.3.1-alpha.
  3970. - Downgrade a message about cleaning the microdescriptor cache to
  3971. "info" from "notice". Fixes bug 6238; bugfix on 0.2.3.1-alpha.
  3972. - Log a BUG message at severity INFO if we have a networkstatus with
  3973. a missing entry for some microdescriptor. Continues on a patch
  3974. to 0.2.3.2-alpha.
  3975. - Improve the log message when a managed proxy fails to launch. Fixes
  3976. bug 5099; bugfix on 0.2.3.6-alpha.
  3977. - Don't do DNS lookups when parsing corrupted managed proxy protocol
  3978. messages. Fixes bug 6226; bugfix on 0.2.3.6-alpha.
  3979. - When formatting wildcarded address mappings for the controller,
  3980. be sure to include "*." as appropriate. Partially fixes bug 6244;
  3981. bugfix on 0.2.3.9-alpha.
  3982. - Avoid a warning caused by using strcspn() from glibc with clang 3.0.
  3983. Bugfix on 0.2.3.13-alpha.
  3984. - Stop logging messages about running with circuit timeout learning
  3985. enabled at severity LD_BUG. Fixes bug 6169; bugfix on 0.2.3.17-beta.
  3986. - Disable a spurious warning about reading on a marked and flushing
  3987. connection. We shouldn't be doing that, but apparently we
  3988. sometimes do. Fixes bug 6203; bugfix on 0.2.3.17-beta.
  3989. - Fix a bug that stopped AllowDotExit from working on addresses
  3990. that had an entry in the DNS cache. Fixes bug 6211; bugfix on
  3991. 0.2.3.17-beta.
  3992. o Code simplification, refactoring, unit tests:
  3993. - Move tor_gettimeofday_cached() into compat_libevent.c, and use
  3994. Libevent's notion of cached time when possible.
  3995. - Remove duplicate code for invoking getrlimit() from control.c.
  3996. - Add a unit test for the environment_variable_names_equal function.
  3997. o Documentation:
  3998. - Document the --defaults-torrc option, and the new (in 0.2.3)
  3999. semantics for overriding, extending, and clearing lists of
  4000. options. Closes bug 4748.
  4001. Changes in version 0.2.3.17-beta - 2012-06-15
  4002. Tor 0.2.3.17-beta enables compiler and linker hardening by default,
  4003. gets our TLS handshake back on track for being able to blend in with
  4004. Firefox, fixes a big bug in 0.2.3.16-alpha that broke Tor's interaction
  4005. with Vidalia, and otherwise continues to get us closer to a release
  4006. candidate.
  4007. o Major features:
  4008. - Enable gcc and ld hardening by default. Resolves ticket 5210.
  4009. - Update TLS cipher list to match Firefox 8 and later. Resolves
  4010. ticket 4744.
  4011. - Implement the client side of proposal 198: remove support for
  4012. clients falsely claiming to support standard ciphersuites that
  4013. they can actually provide. As of modern OpenSSL versions, it's not
  4014. necessary to fake any standard ciphersuite, and doing so prevents
  4015. us from using better ciphersuites in the future, since servers
  4016. can't know whether an advertised ciphersuite is really supported or
  4017. not. Some hosts -- notably, ones with very old versions of OpenSSL
  4018. or where OpenSSL has been built with ECC disabled -- will stand
  4019. out because of this change; TBB users should not be affected.
  4020. o Major bugfixes:
  4021. - Change the default value for DynamicDHGroups (introduced in
  4022. 0.2.3.9-alpha) to 0. This feature can make Tor relays less
  4023. identifiable by their use of the mod_ssl DH group, but at
  4024. the cost of some usability (#4721) and bridge tracing (#6087)
  4025. regressions. Resolves ticket 5598.
  4026. - Send a CRLF at the end of each STATUS_* control protocol event. This
  4027. bug tickled a bug in Vidalia which would make it freeze. Fixes
  4028. bug 6094; bugfix on 0.2.3.16-alpha.
  4029. o Minor bugfixes:
  4030. - Disable writing on marked-for-close connections when they are
  4031. blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
  4032. bug 5263; bugfix on 0.0.2pre13, where we first added a special
  4033. case for flushing marked connections.
  4034. - Detect SSL handshake even when the initial attempt to write the
  4035. server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
  4036. - Change the AllowDotExit rules so they should actually work.
  4037. We now enforce AllowDotExit only immediately after receiving an
  4038. address via SOCKS or DNSPort: other sources are free to provide
  4039. .exit addresses after the resolution occurs. Fixes bug 3940;
  4040. bugfix on 0.2.2.1-alpha.
  4041. - Fix a (harmless) integer overflow in cell statistics reported by
  4042. some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
  4043. - Make sure circuitbuild.c checks LearnCircuitBuildTimeout in all the
  4044. right places and never depends on the consensus parameters or
  4045. computes adaptive timeouts when it is disabled. Fixes bug 5049;
  4046. bugfix on 0.2.2.14-alpha.
  4047. - When building Tor on Windows with -DUNICODE (not default), ensure
  4048. that error messages, filenames, and DNS server names are always
  4049. NUL-terminated when we convert them to a single-byte encoding.
  4050. Fixes bug 5909; bugfix on 0.2.2.16-alpha.
  4051. - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
  4052. Fixes bug 6097; bugfix on 0.2.2.16-alpha.
  4053. - Fix an edge case where TestingTorNetwork is set but the authorities
  4054. and relays all have an uptime of zero, where the private Tor network
  4055. could briefly lack support for hidden services. Fixes bug 3886;
  4056. bugfix on 0.2.2.18-alpha.
  4057. - Correct the manpage's descriptions for the default values of
  4058. DirReqStatistics and ExtraInfoStatistics. Fixes bug 2865; bugfix
  4059. on 0.2.3.1-alpha.
  4060. - Fix the documentation for the --hush and --quiet command line
  4061. options, which changed their behavior back in 0.2.3.3-alpha.
  4062. - Fix compilation warning with clang 3.1. Fixes bug 6141; bugfix on
  4063. 0.2.3.11-alpha.
  4064. o Minor features:
  4065. - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
  4066. more information to it, so that we can track it down in case it
  4067. returns again. Mitigates bug 5235.
  4068. - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
  4069. options_validate(); warn if LearnCircuitBuildTimeout is disabled and
  4070. CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
  4071. - Warn the user when HTTPProxy, but no other proxy type, is
  4072. configured. This can cause surprising behavior: it doesn't send
  4073. all of Tor's traffic over the HTTPProxy -- it sends unencrypted
  4074. directory traffic only. Resolves ticket 4663.
  4075. - Issue a notice if a guard completes less than 40% of your circuits.
  4076. Threshold is configurable by torrc option PathBiasNoticeRate and
  4077. consensus parameter pb_noticepct. There is additional, off-by-
  4078. default code to disable guards which fail too many circuits.
  4079. Addresses ticket 5458.
  4080. - Update to the June 6 2012 Maxmind GeoLite Country database.
  4081. o Code simplifications and refactoring:
  4082. - Remove validate_pluggable_transports_config(): its warning
  4083. message is now handled by connection_or_connect().
  4084. Changes in version 0.2.2.37 - 2012-06-06
  4085. Tor 0.2.2.37 introduces a workaround for a critical renegotiation
  4086. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  4087. currently).
  4088. o Major bugfixes:
  4089. - Work around a bug in OpenSSL that broke renegotiation with TLS
  4090. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  4091. the v2 Tor connection protocol when both sides were using OpenSSL
  4092. 1.0.1 would fail. Resolves ticket 6033.
  4093. - When waiting for a client to renegotiate, don't allow it to add
  4094. any bytes to the input buffer. This fixes a potential DoS issue.
  4095. Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
  4096. - Fix an edge case where if we fetch or publish a hidden service
  4097. descriptor, we might build a 4-hop circuit and then use that circuit
  4098. for exiting afterwards -- even if the new last hop doesn't obey our
  4099. ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
  4100. o Minor bugfixes:
  4101. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  4102. Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
  4103. o Minor features:
  4104. - Tell GCC and Clang to check for any errors in format strings passed
  4105. to the tor_v*(print|scan)f functions.
  4106. Changes in version 0.2.3.16-alpha - 2012-06-05
  4107. Tor 0.2.3.16-alpha introduces a workaround for a critical renegotiation
  4108. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  4109. currently). It also fixes a variety of smaller bugs and other cleanups
  4110. that get us closer to a release candidate.
  4111. o Major bugfixes (general):
  4112. - Work around a bug in OpenSSL that broke renegotiation with TLS
  4113. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  4114. the v2 Tor connection protocol when both sides were using OpenSSL
  4115. 1.0.1 would fail. Resolves ticket 6033.
  4116. - When waiting for a client to renegotiate, don't allow it to add
  4117. any bytes to the input buffer. This fixes a potential DoS issue.
  4118. Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
  4119. - Pass correct OR address to managed proxies (like obfsproxy),
  4120. even when ORListenAddress is used. Fixes bug 4865; bugfix on
  4121. 0.2.3.9-alpha.
  4122. - The advertised platform of a router now includes only its operating
  4123. system's name (e.g., "Linux", "Darwin", "Windows 7"), and not its
  4124. service pack level (for Windows) or its CPU architecture (for Unix).
  4125. We also no longer include the "git-XYZ" tag in the version. Resolves
  4126. part of bug 2988.
  4127. o Major bugfixes (clients):
  4128. - If we are unable to find any exit that supports our predicted ports,
  4129. stop calling them predicted, so that we don't loop and build
  4130. hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
  4131. which introduced predicted ports.
  4132. - Fix an edge case where if we fetch or publish a hidden service
  4133. descriptor, we might build a 4-hop circuit and then use that circuit
  4134. for exiting afterwards -- even if the new last hop doesn't obey our
  4135. ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
  4136. - Check at each new consensus whether our entry guards were picked
  4137. long enough ago that we should rotate them. Previously, we only
  4138. did this check at startup, which could lead to us holding a guard
  4139. indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
  4140. - When fetching a bridge descriptor from a bridge authority,
  4141. always do so anonymously, whether we have been able to open
  4142. circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
  4143. This behavior makes it *safer* to use UpdateBridgesFromAuthority,
  4144. but we'll need to wait for bug 6010 before it's actually usable.
  4145. o Major bugfixes (directory authorities):
  4146. - When computing weight parameters, behave more robustly in the
  4147. presence of a bad bwweightscale value. Previously, the authorities
  4148. would crash if they agreed on a sufficiently broken weight_scale
  4149. value: now, they use a reasonable default and carry on. Partial
  4150. fix for 5786; bugfix on 0.2.2.17-alpha.
  4151. - Check more thoroughly to prevent a rogue authority from
  4152. double-voting on any consensus directory parameter. Previously,
  4153. authorities would crash in this case if the total number of
  4154. votes for any parameter exceeded the number of active voters,
  4155. but would let it pass otherwise. Partial fix for bug 5786; bugfix
  4156. on 0.2.2.2-alpha.
  4157. o Minor features:
  4158. - Rate-limit log messages when asked to connect anonymously to
  4159. a private address. When these hit, they tended to hit fast and
  4160. often. Also, don't bother trying to connect to addresses that we
  4161. are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
  4162. reply makes us think we have been lied to, even when the address the
  4163. client tried to connect to was "localhost." Resolves ticket 2822.
  4164. - Allow packagers to insert an extra string in server descriptor
  4165. platform lines by setting the preprocessor variable TOR_BUILD_TAG.
  4166. Resolves the rest of ticket 2988.
  4167. - Raise the threshold of server descriptors needed (75%) and exit
  4168. server descriptors needed (50%) before we will declare ourselves
  4169. bootstrapped. This will make clients start building circuits a
  4170. little later, but makes the initially constructed circuits less
  4171. skewed and less in conflict with further directory fetches. Fixes
  4172. ticket 3196.
  4173. - Close any connection that sends unrecognized junk before the
  4174. handshake. Solves an issue noted in bug 4369.
  4175. - Improve log messages about managed transports. Resolves ticket 5070.
  4176. - Tag a bridge's descriptor as "never to be sent unencrypted".
  4177. This shouldn't matter, since bridges don't open non-anonymous
  4178. connections to the bridge authority and don't allow unencrypted
  4179. directory connections from clients, but we might as well make
  4180. sure. Closes bug 5139.
  4181. - Expose our view of whether we have gone dormant to the controller,
  4182. via a new "GETINFO dormant" value. Torbutton and other controllers
  4183. can use this to avoid doing periodic requests through Tor while
  4184. it's dormant (bug 4718). Fixes bug 5954.
  4185. - Tell GCC and Clang to check for any errors in format strings passed
  4186. to the tor_v*(print|scan)f functions.
  4187. - Update to the May 1 2012 Maxmind GeoLite Country database.
  4188. o Minor bugfixes (already included in 0.2.2.36):
  4189. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  4190. Fixes bug 5346; bugfix on 0.0.8pre3.
  4191. - Correct parsing of certain date types in parse_http_time().
  4192. Without this patch, If-Modified-Since would behave
  4193. incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
  4194. Esteban Manchado Velázques.
  4195. - Make our number-parsing functions always treat too-large values
  4196. as an error, even when those values exceed the width of the
  4197. underlying type. Previously, if the caller provided these
  4198. functions with minima or maxima set to the extreme values of the
  4199. underlying integer type, these functions would return those
  4200. values on overflow rather than treating overflow as an error.
  4201. Fixes part of bug 5786; bugfix on 0.0.9.
  4202. - If we hit the error case where routerlist_insert() replaces an
  4203. existing (old) server descriptor, make sure to remove that
  4204. server descriptor from the old_routers list. Fix related to bug
  4205. 1776. Bugfix on 0.2.2.18-alpha.
  4206. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  4207. circuits. Fixes issue 5259.
  4208. o Minor bugfixes (coding cleanup, on 0.2.2.x and earlier):
  4209. - Prevent a null-pointer dereference when receiving a data cell
  4210. for a nonexistent stream when the circuit in question has an
  4211. empty deliver window. We don't believe this is triggerable,
  4212. since we don't currently allow deliver windows to become empty,
  4213. but the logic is tricky enough that it's better to make the code
  4214. robust. Fixes bug 5541; bugfix on 0.0.2pre14.
  4215. - Fix a memory leak when trying to launch a DNS request when the
  4216. network is disabled or the nameservers are unconfigurable. Fixes
  4217. bug 5916; bugfix on Tor 0.1.2.1-alpha (for the unconfigurable
  4218. nameserver case) and on 0.2.3.9-alpha (for the DisableNetwork case).
  4219. - Don't hold a Windows file handle open for every file mapping;
  4220. the file mapping handle is sufficient. Fixes bug 5951; bugfix on
  4221. 0.1.2.1-alpha.
  4222. - Avoid O(n^2) performance characteristics when parsing a large
  4223. extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
  4224. - Format more doubles with %f, not %lf. Patch from grarpamp to make
  4225. Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
  4226. Tor 0.2.0.8-alpha.
  4227. - Make our replacement implementation of strtok_r() compatible with
  4228. the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
  4229. bugfix on 0.2.2.1-alpha.
  4230. - Fix a NULL-pointer dereference on a badly formed
  4231. SETCIRCUITPURPOSE command. Found by mikeyc. Fixes bug 5796;
  4232. bugfix on 0.2.2.9-alpha.
  4233. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  4234. Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
  4235. - Defensively refactor rend_mid_rendezvous() so that protocol
  4236. violations and length checks happen in the beginning. Fixes
  4237. bug 5645.
  4238. - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
  4239. that IPv6 stuff will compile on MSVC, and compilation issues
  4240. will be easier to track down. Fixes bug 5861.
  4241. o Minor bugfixes (correctness, on 0.2.2.x and earlier):
  4242. - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
  4243. resource exhaustion, so that clients can adjust their load to
  4244. try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
  4245. started using END_STREAM_REASON_RESOURCELIMIT.
  4246. - Don't check for whether the address we're using for outbound
  4247. connections has changed until after the outbound connection has
  4248. completed. On Windows, getsockname() doesn't succeed until the
  4249. connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
  4250. - If the configuration tries to set MyFamily on a bridge, refuse to
  4251. do so, and warn about the security implications. Fixes bug 4657;
  4252. bugfix on 0.2.0.3-alpha.
  4253. - If the client fails to set a reasonable set of ciphersuites
  4254. during its v2 handshake renegotiation, allow the renegotiation to
  4255. continue nevertheless (i.e. send all the required certificates).
  4256. Fixes bug 4591; bugfix on 0.2.0.20-rc.
  4257. - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
  4258. option is set to 0 (which Vidalia version 0.2.16 now does when
  4259. a SAVECONF attempt fails), perform other actions that SIGHUP
  4260. usually causes (like reopening the logs). Fixes bug 5095; bugfix
  4261. on 0.2.1.9-alpha.
  4262. - If we fail to write a microdescriptor to the disk cache, do not
  4263. continue replacing the old microdescriptor file. Fixes bug 2954;
  4264. bugfix on 0.2.2.6-alpha.
  4265. - Exit nodes don't need to fetch certificates for authorities that
  4266. they don't recognize; only directory authorities, bridges,
  4267. and caches need to do that. Fixes part of bug 2297; bugfix on
  4268. 0.2.2.11-alpha.
  4269. - Correctly handle checking the permissions on the parent
  4270. directory of a control socket in the root directory. Bug found
  4271. by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
  4272. 0.2.2.26-beta.
  4273. - When told to add a bridge with the same digest as a preexisting
  4274. bridge but a different addr:port, change the addr:port as
  4275. requested. Previously we would not notice the change. Fixes half
  4276. of bug 5603; fix on 0.2.2.26-beta.
  4277. - End AUTHCHALLENGE error messages (in the control protocol) with
  4278. a CRLF. Fixes bug 5760; bugfix on 0.2.2.36 and 0.2.3.13-alpha.
  4279. o Minor bugfixes (on 0.2.3.x):
  4280. - Turn an assertion (that the number of handshakes received as a
  4281. server is not < 1) into a warning. Fixes bug 4873; bugfix on
  4282. 0.2.3.1-alpha.
  4283. - Format IPv4 addresses correctly in ADDRMAP events. (Previously,
  4284. we had reversed them when the answer was cached.) Fixes bug
  4285. 5723; bugfix on 0.2.3.1-alpha.
  4286. - Work correctly on Linux systems with accept4 support advertised in
  4287. their headers, but without accept4 support in the kernel. Fix
  4288. by murb. Fixes bug 5762; bugfix on 0.2.3.1-alpha.
  4289. - When told to add a bridge with the same addr:port as a preexisting
  4290. bridge but a different transport, change the transport as
  4291. requested. Previously we would not notice the change. Fixes half
  4292. of bug 5603; fix on 0.2.3.2-alpha.
  4293. - Avoid a "double-reply" warning when replying to a SOCKS request
  4294. with a parse error. Patch from Fabian Keil. Fixes bug 4108;
  4295. bugfix on 0.2.3.4-alpha.
  4296. - Fix a bug where a bridge authority crashes if it has seen no
  4297. directory requests when it's time to write statistics to disk.
  4298. Fixes bug 5891; bugfix on 0.2.3.6-alpha. Also fixes bug 5508 in
  4299. a better way.
  4300. - Don't try to open non-control listeners when DisableNetwork is set.
  4301. Previously, we'd open all listeners, then immediately close them.
  4302. Fixes bug 5604; bugfix on 0.2.3.9-alpha.
  4303. - Don't abort the managed proxy protocol if the managed proxy
  4304. sends us an unrecognized line; ignore it instead. Fixes bug
  4305. 5910; bugfix on 0.2.3.9-alpha.
  4306. - Fix a compile warning in crypto.c when compiling with clang 3.1.
  4307. Fixes bug 5969, bugfix on 0.2.3.9-alpha.
  4308. - Fix a compilation issue on GNU Hurd, which doesn't have PATH_MAX.
  4309. Fixes bug 5355; bugfix on 0.2.3.11-alpha.
  4310. - Remove bogus definition of "_WIN32" from src/win32/orconfig.h, to
  4311. unbreak the MSVC build. Fixes bug 5858; bugfix on 0.2.3.12-alpha.
  4312. - Resolve numerous small warnings and build issues with MSVC. Resolves
  4313. bug 5859.
  4314. o Documentation fixes:
  4315. - Improve the manual's documentation for the NT Service command-line
  4316. options. Addresses ticket 3964.
  4317. - Clarify SessionGroup documentation slightly; resolves ticket 5437.
  4318. - Document the changes to the ORPort and DirPort options, and the
  4319. fact that {OR/Dir}ListenAddress is now unnecessary (and
  4320. therefore deprecated). Resolves ticket 5597.
  4321. o Removed files:
  4322. - Remove the torrc.bridge file: we don't use it for anything, and
  4323. it had become badly desynchronized from torrc.sample. Resolves
  4324. bug 5622.
  4325. Changes in version 0.2.2.36 - 2012-05-24
  4326. Tor 0.2.2.36 updates the addresses for two of the eight directory
  4327. authorities, fixes some potential anonymity and security issues,
  4328. and fixes several crash bugs.
  4329. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
  4330. known flaws, and nobody should be using them. You should upgrade. If
  4331. you're using a Linux or BSD and its packages are obsolete, stop using
  4332. those packages and upgrade anyway.
  4333. o Directory authority changes:
  4334. - Change IP address for maatuska (v3 directory authority).
  4335. - Change IP address for ides (v3 directory authority), and rename
  4336. it to turtles.
  4337. o Security fixes:
  4338. - When building or running with any version of OpenSSL earlier
  4339. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  4340. versions have a bug (CVE-2011-4576) in which their block cipher
  4341. padding includes uninitialized data, potentially leaking sensitive
  4342. information to any peer with whom they make a SSLv3 connection. Tor
  4343. does not use SSL v3 by default, but a hostile client or server
  4344. could force an SSLv3 connection in order to gain information that
  4345. they shouldn't have been able to get. The best solution here is to
  4346. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  4347. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  4348. to make sure that the bug can't happen.
  4349. - Never use a bridge or a controller-supplied node as an exit, even
  4350. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  4351. 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
  4352. and 0.2.0.3-alpha (for bridge-purpose descriptors).
  4353. - Only build circuits if we have a sufficient threshold of the total
  4354. descriptors that are marked in the consensus with the "Exit"
  4355. flag. This mitigates an attack proposed by wanoskarnet, in which
  4356. all of a client's bridges collude to restrict the exit nodes that
  4357. the client knows about. Fixes bug 5343.
  4358. - Provide controllers with a safer way to implement the cookie
  4359. authentication mechanism. With the old method, if another locally
  4360. running program could convince a controller that it was the Tor
  4361. process, then that program could trick the controller into telling
  4362. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  4363. authentication method uses a challenge-response approach to prevent
  4364. this attack. Fixes bug 5185; implements proposal 193.
  4365. o Major bugfixes:
  4366. - Avoid logging uninitialized data when unable to decode a hidden
  4367. service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
  4368. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  4369. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  4370. 0.2.1.6-alpha.
  4371. - Fix builds when the path to sed, openssl, or sha1sum contains
  4372. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  4373. on 0.2.2.1-alpha.
  4374. - Correct our replacements for the timeradd() and timersub() functions
  4375. on platforms that lack them (for example, Windows). The timersub()
  4376. function is used when expiring circuits, while timeradd() is
  4377. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  4378. bugfix on 0.2.2.24-alpha.
  4379. - Fix the SOCKET_OK test that we use to tell when socket
  4380. creation fails so that it works on Win64. Fixes part of bug 4533;
  4381. bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
  4382. o Minor bugfixes:
  4383. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  4384. Fixes bug 5346; bugfix on 0.0.8pre3.
  4385. - Make our number-parsing functions always treat too-large values
  4386. as an error, even when those values exceed the width of the
  4387. underlying type. Previously, if the caller provided these
  4388. functions with minima or maxima set to the extreme values of the
  4389. underlying integer type, these functions would return those
  4390. values on overflow rather than treating overflow as an error.
  4391. Fixes part of bug 5786; bugfix on 0.0.9.
  4392. - Older Linux kernels erroneously respond to strange nmap behavior
  4393. by having accept() return successfully with a zero-length
  4394. socket. When this happens, just close the connection. Previously,
  4395. we would try harder to learn the remote address: but there was
  4396. no such remote address to learn, and our method for trying to
  4397. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  4398. on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
  4399. - Correct parsing of certain date types in parse_http_time().
  4400. Without this patch, If-Modified-Since would behave
  4401. incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
  4402. Esteban Manchado Velázques.
  4403. - Change the BridgePassword feature (part of the "bridge community"
  4404. design, which is not yet implemented) to use a time-independent
  4405. comparison. The old behavior might have allowed an adversary
  4406. to use timing to guess the BridgePassword value. Fixes bug 5543;
  4407. bugfix on 0.2.0.14-alpha.
  4408. - Detect and reject certain misformed escape sequences in
  4409. configuration values. Previously, these values would cause us
  4410. to crash if received in a torrc file or over an authenticated
  4411. control port. Bug found by Esteban Manchado Velázquez, and
  4412. independently by Robert Connolly from Matta Consulting who further
  4413. noted that it allows a post-authentication heap overflow. Patch
  4414. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  4415. bugfix on 0.2.0.16-alpha.
  4416. - Fix a compile warning when using the --enable-openbsd-malloc
  4417. configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
  4418. - During configure, detect when we're building with clang version
  4419. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  4420. CFLAGS. clang doesn't support them yet.
  4421. - When sending an HTTP/1.1 proxy request, include a Host header.
  4422. Fixes bug 5593; bugfix on 0.2.2.1-alpha.
  4423. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
  4424. command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
  4425. - If we hit the error case where routerlist_insert() replaces an
  4426. existing (old) server descriptor, make sure to remove that
  4427. server descriptor from the old_routers list. Fix related to bug
  4428. 1776. Bugfix on 0.2.2.18-alpha.
  4429. o Minor bugfixes (documentation and log messages):
  4430. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  4431. Fixes bug 4856; bugfix on Tor 0.0.6.
  4432. - Update "ClientOnly" man page entry to explain that there isn't
  4433. really any point to messing with it. Resolves ticket 5005.
  4434. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  4435. directory authority option (introduced in Tor 0.2.2.34).
  4436. - Downgrade the "We're missing a certificate" message from notice
  4437. to info: people kept mistaking it for a real problem, whereas it
  4438. is seldom the problem even when we are failing to bootstrap. Fixes
  4439. bug 5067; bugfix on 0.2.0.10-alpha.
  4440. - Correctly spell "connect" in a log message on failure to create a
  4441. controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
  4442. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  4443. circuits. Fixes issue 5259.
  4444. o Minor features:
  4445. - Directory authorities now reject versions of Tor older than
  4446. 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
  4447. inclusive. These versions accounted for only a small fraction of
  4448. the Tor network, and have numerous known security issues. Resolves
  4449. issue 4788.
  4450. - Update to the May 1 2012 Maxmind GeoLite Country database.
  4451. - Feature removal:
  4452. - When sending or relaying a RELAY_EARLY cell, we used to convert
  4453. it to a RELAY cell if the connection was using the v1 link
  4454. protocol. This was a workaround for older versions of Tor, which
  4455. didn't handle RELAY_EARLY cells properly. Now that all supported
  4456. versions can handle RELAY_EARLY cells, and now that we're enforcing
  4457. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  4458. remove this workaround. Addresses bug 4786.
  4459. Changes in version 0.2.3.15-alpha - 2012-04-30
  4460. Tor 0.2.3.15-alpha fixes a variety of smaller bugs, including making
  4461. the development branch build on Windows again.
  4462. o Minor bugfixes (on 0.2.2.x and earlier):
  4463. - Make sure that there are no unhandled pending TLS errors before
  4464. reading from a TLS stream. We had checks in 0.1.0.3-rc, but
  4465. lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
  4466. Bugfix on 0.1.0.5-rc; fixes bug 4528.
  4467. - Fix an assert that directory authorities could trigger on sighup
  4468. during some configuration state transitions. We now don't treat
  4469. it as a fatal error when the new descriptor we just generated in
  4470. init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
  4471. - After we pick a directory mirror, we would refuse to use it if
  4472. it's in our ExcludeExitNodes list, resulting in mysterious failures
  4473. to bootstrap for people who just wanted to avoid exiting from
  4474. certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
  4475. - When building with --enable-static-tor on OpenBSD, do not
  4476. erroneously attempt to link -lrt. Fixes bug 5103.
  4477. o Minor bugfixes (on 0.2.3.x):
  4478. - When Tor is built with kernel headers from a recent (last few
  4479. years) Linux kernel, do not fail to run on older (pre-2.6.28
  4480. Linux kernels). Fixes bug 5112; bugfix on 0.2.3.1-alpha.
  4481. - Fix cross-compilation issues with mingw. Bugfixes on 0.2.3.6-alpha
  4482. and 0.2.3.12-alpha.
  4483. - Fix compilation with miniupnpc version 1.6; patch from
  4484. Anthony G. Basile. Fixes bug 5434; bugfix on 0.2.3.12-alpha.
  4485. - Fix compilation with MSVC, which had defined MS_WINDOWS. Bugfix
  4486. on 0.2.3.13-alpha; found and fixed by Gisle Vanem.
  4487. - Fix compilation on platforms without unistd.h, or where environ
  4488. is defined in stdlib.h. Fixes bug 5704; bugfix on 0.2.3.13-alpha.
  4489. o Minor features:
  4490. - Directory authorities are now a little more lenient at accepting
  4491. older router descriptors, or newer router descriptors that don't
  4492. make big changes. This should help ameliorate past and future
  4493. issues where routers think they have uploaded valid descriptors,
  4494. but the authorities don't think so. Fix for ticket 2479.
  4495. - Make the code that clients use to detect an address change be
  4496. IPv6-aware, so that it won't fill clients' logs with error
  4497. messages when trying to get the IPv4 address of an IPv6
  4498. connection. Implements ticket 5537.
  4499. o Removed features:
  4500. - Remove the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays option;
  4501. authorities needed to use it for a while to keep the network working
  4502. as people upgraded to 0.2.1.31, 0.2.2.34, or 0.2.3.6-alpha, but
  4503. that was six months ago. As of now, it should no longer be needed
  4504. or used.
  4505. Changes in version 0.2.3.14-alpha - 2012-04-23
  4506. Tor 0.2.3.14-alpha fixes yet more bugs to get us closer to a release
  4507. candidate. It also dramatically speeds up AES: fast relays should
  4508. consider switching to the newer OpenSSL library.
  4509. o Directory authority changes:
  4510. - Change IP address for ides (v3 directory authority), and rename
  4511. it to turtles.
  4512. o Major bugfixes:
  4513. - Avoid logging uninitialized data when unable to decode a hidden
  4514. service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
  4515. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  4516. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  4517. 0.2.1.6-alpha.
  4518. - If authorities are unable to get a v2 consensus document from other
  4519. directory authorities, they no longer fall back to fetching
  4520. them from regular directory caches. Fixes bug 5635; bugfix on
  4521. 0.2.2.26-beta, where routers stopped downloading v2 consensus
  4522. documents entirely.
  4523. - When we start a Tor client with a normal consensus already cached,
  4524. be willing to download a microdescriptor consensus. Fixes bug 4011;
  4525. fix on 0.2.3.1-alpha.
  4526. o Major features (performance):
  4527. - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
  4528. instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
  4529. vectorized AES implementations as appropriate. These can be much,
  4530. much faster than other AES implementations.
  4531. o Minor bugfixes (0.2.2.x and earlier):
  4532. - Don't launch more than 10 service-side introduction-point circuits
  4533. for a hidden service in five minutes. Previously, we would consider
  4534. launching more introduction-point circuits if at least one second
  4535. had passed without any introduction-point circuits failing. Fixes
  4536. bug 4607; bugfix on 0.0.7pre1.
  4537. - Change the BridgePassword feature (part of the "bridge community"
  4538. design, which is not yet implemented) to use a time-independent
  4539. comparison. The old behavior might have allowed an adversary
  4540. to use timing to guess the BridgePassword value. Fixes bug 5543;
  4541. bugfix on 0.2.0.14-alpha.
  4542. - Enforce correct return behavior of tor_vsscanf() when the '%%'
  4543. pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
  4544. - When sending an HTTP/1.1 proxy request, include a Host header.
  4545. Fixes bug 5593; bugfix on 0.2.2.1-alpha.
  4546. - Don't log that we have "decided to publish new relay descriptor"
  4547. unless we are actually publishing a descriptor. Fixes bug 3942;
  4548. bugfix on 0.2.2.28-beta.
  4549. o Minor bugfixes (0.2.3.x):
  4550. - Fix a bug where a bridge authority crashes (on a failed assert)
  4551. if it has seen no directory requests when it's time to write
  4552. statistics to disk. Fixes bug 5508. Bugfix on 0.2.3.6-alpha.
  4553. - Fix bug stomping on ORPort option NoListen and ignoring option
  4554. NoAdvertise. Fixes bug 5151; bugfix on 0.2.3.9-alpha.
  4555. - In the testsuite, provide a large enough buffer in the tor_sscanf
  4556. unit test. Otherwise we'd overrun that buffer and crash during
  4557. the unit tests. Found by weasel. Fixes bug 5449; bugfix on
  4558. 0.2.3.12-alpha.
  4559. - Make sure we create the keys directory if it doesn't exist and we're
  4560. about to store the dynamic Diffie-Hellman parameters. Fixes bug
  4561. 5572; bugfix on 0.2.3.13-alpha.
  4562. - Fix a small memory leak when trying to decode incorrect base16
  4563. authenticator during SAFECOOKIE authentication. Found by
  4564. Coverity Scan. Fixes CID 507. Bugfix on 0.2.3.13-alpha.
  4565. o Minor features:
  4566. - Add more information to a log statement that might help track down
  4567. bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
  4568. non-IP address" messages (or any Bug messages, for that matter!),
  4569. please let us know about it.
  4570. - Relays now understand an IPv6 address when they get one from a
  4571. directory server. Resolves ticket 4875.
  4572. - Resolve IPv6 addresses in bridge and entry statistics to country
  4573. code "??" which means we at least count them. Resolves ticket 5053;
  4574. improves on 0.2.3.9-alpha.
  4575. - Update to the April 3 2012 Maxmind GeoLite Country database.
  4576. - Begin a doc/state-contents.txt file to explain the contents of
  4577. the Tor state file. Fixes bug 2987.
  4578. o Default torrc changes:
  4579. - Stop listing "socksport 9050" in torrc.sample. We open a socks
  4580. port on 9050 by default anyway, so this should not change anything
  4581. in practice.
  4582. - Stop mentioning the deprecated *ListenAddress options in
  4583. torrc.sample. Fixes bug 5438.
  4584. - Document unit of bandwidth related options in sample torrc.
  4585. Fixes bug 5621.
  4586. o Removed features:
  4587. - The "torify" script no longer supports the "tsocks" socksifier
  4588. tool, since tsocks doesn't support DNS and UDP right for Tor.
  4589. Everyone should be using torsocks instead. Fixes bugs 3530 and
  4590. 5180. Based on a patch by "ugh".
  4591. o Code refactoring:
  4592. - Change the symmetric cipher interface so that creating and
  4593. initializing a stream cipher are no longer separate functions.
  4594. - Remove all internal support for unpadded RSA. We never used it, and
  4595. it would be a bad idea to start.
  4596. Changes in version 0.2.3.13-alpha - 2012-03-26
  4597. Tor 0.2.3.13-alpha fixes a variety of stability and correctness bugs
  4598. in managed pluggable transports, as well as providing other cleanups
  4599. that get us closer to a release candidate.
  4600. o Directory authority changes:
  4601. - Change IP address for maatuska (v3 directory authority).
  4602. o Security fixes:
  4603. - Provide controllers with a safer way to implement the cookie
  4604. authentication mechanism. With the old method, if another locally
  4605. running program could convince a controller that it was the Tor
  4606. process, then that program could trick the controller into telling
  4607. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  4608. authentication method uses a challenge-response approach to prevent
  4609. this attack. Fixes bug 5185, implements proposal 193.
  4610. - Never use a bridge or a controller-supplied node as an exit, even
  4611. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  4612. 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
  4613. and 0.2.0.3-alpha (for bridge-purpose descriptors).
  4614. - Only build circuits if we have a sufficient threshold of the total
  4615. descriptors that are marked in the consensus with the "Exit"
  4616. flag. This mitigates an attack proposed by wanoskarnet, in which
  4617. all of a client's bridges collude to restrict the exit nodes that
  4618. the client knows about. Fixes bug 5343.
  4619. o Major bugfixes (on Tor 0.2.3.x):
  4620. - Avoid an assert when managed proxies like obfsproxy are configured,
  4621. and we receive HUP signals or setconf attempts too rapidly. This
  4622. situation happens most commonly when Vidalia tries to attach to
  4623. Tor or tries to configure the Tor it's attached to. Fixes bug 5084;
  4624. bugfix on 0.2.3.6-alpha.
  4625. - Fix a relay-side pluggable transports bug where managed proxies were
  4626. unreachable from the Internet, because Tor asked them to bind on
  4627. localhost. Fixes bug 4725; bugfix on 0.2.3.9-alpha.
  4628. - Stop discarding command-line arguments when TestingTorNetwork
  4629. is set. Discovered by Kevin Bauer. Fixes bug 5373; bugfix on
  4630. 0.2.3.9-alpha, where task 4552 added support for two layers of
  4631. torrc files.
  4632. - Resume allowing the unit tests to run in gdb. This was accidentally
  4633. made impossible when the DisableDebuggerAttachment option was
  4634. introduced. Fixes bug 5448; bugfix on 0.2.3.9-alpha.
  4635. - Resume building with nat-pmp support. Fixes bug 4955; bugfix on
  4636. 0.2.3.11-alpha. Reported by Anthony G. Basile.
  4637. o Minor bugfixes (on 0.2.2.x and earlier):
  4638. - Ensure we don't cannibalize circuits that are longer than three hops
  4639. already, so we don't end up making circuits with 5 or more
  4640. hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
  4641. 0.1.0.1-rc which introduced cannibalization.
  4642. - Detect and reject certain misformed escape sequences in
  4643. configuration values. Previously, these values would cause us
  4644. to crash if received in a torrc file or over an authenticated
  4645. control port. Bug found by Esteban Manchado Velázquez, and
  4646. independently by Robert Connolly from Matta Consulting who further
  4647. noted that it allows a post-authentication heap overflow. Patch
  4648. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  4649. bugfix on 0.2.0.16-alpha.
  4650. - Fix a compile warning when using the --enable-openbsd-malloc
  4651. configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
  4652. - Directory caches no longer refuse to clean out descriptors because
  4653. of missing v2 networkstatus documents, unless they're configured
  4654. to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
  4655. 0.2.2.26-beta. Patch by Daniel Bryg.
  4656. - Update to the latest version of the tinytest unit testing framework.
  4657. This includes a couple of bugfixes that can be relevant for
  4658. running forked unit tests on Windows, and removes all reserved
  4659. identifiers.
  4660. o Minor bugfixes (on 0.2.3.x):
  4661. - On a failed pipe() call, don't leak file descriptors. Fixes bug
  4662. 4296; bugfix on 0.2.3.1-alpha.
  4663. - Spec conformance: on a v3 handshake, do not send a NETINFO cell
  4664. until after we have received a CERTS cell. Fixes bug 4361; bugfix
  4665. on 0.2.3.6-alpha. Patch by "frosty".
  4666. - When binding to an IPv6 address, set the IPV6_V6ONLY socket
  4667. option, so that the IP stack doesn't decide to use it for IPv4
  4668. too. Fixes bug 4760; bugfix on 0.2.3.9-alpha.
  4669. - Ensure that variables set in Tor's environment cannot override
  4670. environment variables that Tor passes to a managed
  4671. pluggable-transport proxy. Previously, Tor would pass every
  4672. variable in its environment to managed proxies along with the new
  4673. ones, in such a way that on many operating systems, the inherited
  4674. environment variables would override those which Tor tried to
  4675. explicitly set. Bugfix on 0.2.3.12-alpha for most Unixoid systems;
  4676. bugfix on 0.2.3.9-alpha for Windows.
  4677. o Minor features:
  4678. - A wide variety of new unit tests by Esteban Manchado Velázquez.
  4679. - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
  4680. - Update to the March 6 2012 Maxmind GeoLite Country database.
  4681. Changes in version 0.2.3.12-alpha - 2012-02-13
  4682. Tor 0.2.3.12-alpha lets fast exit relays scale better, allows clients
  4683. to use bridges that run Tor 0.2.2.x, and resolves several big bugs
  4684. when Tor is configured to use a pluggable transport like obfsproxy.
  4685. o Major bugfixes:
  4686. - Fix builds when the path to sed, openssl, or sha1sum contains
  4687. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  4688. on 0.2.2.1-alpha.
  4689. - Set the SO_REUSEADDR socket option before we call bind() on outgoing
  4690. connections. This change should allow busy exit relays to stop
  4691. running out of available sockets as quickly. Fixes bug 4950;
  4692. bugfix on 0.2.2.26-beta.
  4693. - Allow 0.2.3.x clients to use 0.2.2.x bridges. Previously the client
  4694. would ask the bridge for microdescriptors, which are only supported
  4695. in 0.2.3.x, and then fail to bootstrap when it didn't get the
  4696. answers it wanted. Fixes bug 4013; bugfix on 0.2.3.2-alpha.
  4697. - Properly set up obfsproxy's environment when in managed mode. The
  4698. Tor Browser Bundle needs LD_LIBRARY_PATH to be passed to obfsproxy,
  4699. and when you run your Tor as a daemon, there's no HOME. Fixes bugs
  4700. 5076 and 5082; bugfix on 0.2.3.6-alpha.
  4701. o Minor features:
  4702. - Use the dead_strip option when building Tor on OS X. This reduces
  4703. binary size by almost 19% when linking openssl and libevent
  4704. statically, which we do for Tor Browser Bundle.
  4705. - Fix broken URLs in the sample torrc file, and tell readers about
  4706. the OutboundBindAddress, ExitPolicyRejectPrivate, and
  4707. PublishServerDescriptor options. Addresses bug 4652.
  4708. - Update to the February 7 2012 Maxmind GeoLite Country database.
  4709. o Minor bugfixes:
  4710. - Downgrade the "We're missing a certificate" message from notice
  4711. to info: people kept mistaking it for a real problem, whereas it
  4712. is seldom the problem even when we are failing to bootstrap. Fixes
  4713. bug 5067; bugfix on 0.2.0.10-alpha.
  4714. - Don't put "TOR_PT_EXTENDED_SERVER_PORT=127.0.0.1:4200" in a
  4715. managed pluggable transport server proxy's environment.
  4716. Previously, we would put it there, even though Tor doesn't
  4717. implement an 'extended server port' yet, and even though Tor
  4718. almost certainly isn't listening at that address. For now, we set
  4719. it to an empty string to avoid crashing older obfsproxies. Bugfix
  4720. on 0.2.3.6-alpha.
  4721. - Log the heartbeat message every HeartbeatPeriod seconds, not every
  4722. HeartbeatPeriod + 1 seconds. Fixes bug 4942; bugfix on
  4723. 0.2.3.1-alpha. Bug reported by Scott Bennett.
  4724. - Calculate absolute paths correctly on Windows. Fixes bug 4973;
  4725. bugfix on 0.2.3.11-alpha.
  4726. - Update "ClientOnly" man page entry to explain that there isn't
  4727. really any point to messing with it. Resolves ticket 5005.
  4728. - Use the correct CVE number for CVE-2011-4576 in our comments and
  4729. log messages. Found by "fermenthor". Resolves bug 5066; bugfix on
  4730. 0.2.3.11-alpha.
  4731. o Code simplifications and refactoring:
  4732. - Use the _WIN32 macro throughout our code to detect Windows.
  4733. (Previously we had used the obsolete 'WIN32' and the idiosyncratic
  4734. 'MS_WINDOWS'.)
  4735. Changes in version 0.2.3.11-alpha - 2012-01-22
  4736. Tor 0.2.3.11-alpha marks feature-freeze for the 0.2.3 tree. It deploys
  4737. the last step of the plan to limit maximum circuit length, includes
  4738. a wide variety of hidden service performance and correctness fixes,
  4739. works around an OpenSSL security flaw if your distro is too stubborn
  4740. to upgrade, and fixes a bunch of smaller issues.
  4741. o Major features:
  4742. - Now that Tor 0.2.0.x is completely deprecated, enable the final
  4743. part of "Proposal 110: Avoiding infinite length circuits" by
  4744. refusing all circuit-extend requests that do not use a relay_early
  4745. cell. This change helps Tor resist a class of denial-of-service
  4746. attacks by limiting the maximum circuit length.
  4747. - Adjust the number of introduction points that a hidden service
  4748. will try to maintain based on how long its introduction points
  4749. remain in use and how many introductions they handle. Fixes
  4750. part of bug 3825.
  4751. - Try to use system facilities for enumerating local interface
  4752. addresses, before falling back to our old approach (which was
  4753. binding a UDP socket, and calling getsockname() on it). That
  4754. approach was scaring OS X users whose draconian firewall
  4755. software warned about binding to UDP sockets, regardless of
  4756. whether packets were sent. Now we try to use getifaddrs(),
  4757. SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
  4758. system supports. Resolves ticket 1827.
  4759. o Major security workaround:
  4760. - When building or running with any version of OpenSSL earlier
  4761. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  4762. versions have a bug (CVE-2011-4576) in which their block cipher
  4763. padding includes uninitialized data, potentially leaking sensitive
  4764. information to any peer with whom they make a SSLv3 connection. Tor
  4765. does not use SSL v3 by default, but a hostile client or server
  4766. could force an SSLv3 connection in order to gain information that
  4767. they shouldn't have been able to get. The best solution here is to
  4768. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  4769. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  4770. to make sure that the bug can't happen.
  4771. o Major bugfixes:
  4772. - Fix the SOCKET_OK test that we use to tell when socket
  4773. creation fails so that it works on Win64. Fixes part of bug 4533;
  4774. bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
  4775. - Correct our replacements for the timeradd() and timersub() functions
  4776. on platforms that lack them (for example, Windows). The timersub()
  4777. function is used when expiring circuits, while timeradd() is
  4778. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  4779. bugfix on 0.2.2.24-alpha and 0.2.3.1-alpha.
  4780. - Do not use OpenSSL 1.0.0's counter mode: it has a critical bug
  4781. that was fixed in OpenSSL 1.0.0a. We test for the counter mode
  4782. bug at runtime, not compile time, because some distributions hack
  4783. their OpenSSL to mis-report its version. Fixes bug 4779; bugfix
  4784. on 0.2.3.9-alpha. Found by Pascal.
  4785. o Minor features (controller):
  4786. - Use absolute path names when reporting the torrc filename in the
  4787. control protocol, so a controller can more easily find the torrc
  4788. file. Resolves bug 1101.
  4789. - Extend the control protocol to report flags that control a circuit's
  4790. path selection in CIRC events and in replies to 'GETINFO
  4791. circuit-status'. Implements part of ticket 2411.
  4792. - Extend the control protocol to report the hidden service address
  4793. and current state of a hidden-service-related circuit in CIRC
  4794. events and in replies to 'GETINFO circuit-status'. Implements part
  4795. of ticket 2411.
  4796. - When reporting the path to the cookie file to the controller,
  4797. give an absolute path. Resolves ticket 4881.
  4798. - Allow controllers to request an event notification whenever a
  4799. circuit is cannibalized or its purpose is changed. Implements
  4800. part of ticket 3457.
  4801. - Include the creation time of a circuit in CIRC and CIRC2
  4802. control-port events and the list produced by the 'GETINFO
  4803. circuit-status' control-port command.
  4804. o Minor features (directory authorities):
  4805. - Directory authorities now reject versions of Tor older than
  4806. 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
  4807. inclusive. These versions accounted for only a small fraction of
  4808. the Tor network, and have numerous known security issues. Resolves
  4809. issue 4788.
  4810. - Authority operators can now vote for all relays in a given
  4811. set of countries to be BadDir/BadExit/Invalid/Rejected.
  4812. - Provide two consensus parameters (FastFlagMinThreshold and
  4813. FastFlagMaxThreshold) to control the range of allowable bandwidths
  4814. for the Fast directory flag. These allow authorities to run
  4815. experiments on appropriate requirements for being a "Fast" node.
  4816. The AuthDirFastGuarantee config value still applies. Implements
  4817. ticket 3946.
  4818. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  4819. directory authority option (introduced in Tor 0.2.2.34).
  4820. o Minor features (other):
  4821. - Don't disable the DirPort when we cannot exceed our AccountingMax
  4822. limit during this interval because the effective bandwidthrate is
  4823. low enough. This is useful in a situation where AccountMax is only
  4824. used as an additional safeguard or to provide statistics.
  4825. - Prepend an informative header to generated dynamic_dh_params files.
  4826. - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
  4827. EntryNodes will have no effect. Resolves issue 2571.
  4828. - Log more useful messages when we fail to disable debugger
  4829. attachment.
  4830. - Log which authority we're missing votes from when we go to fetch
  4831. them from the other auths.
  4832. - Log (at debug level) whenever a circuit's purpose is changed.
  4833. - Add missing documentation for the MaxClientCircuitsPending,
  4834. UseMicrodescriptors, UserspaceIOCPBuffers, and
  4835. _UseFilteringSSLBufferevents options, all introduced during
  4836. the 0.2.3.x series.
  4837. - Update to the January 3 2012 Maxmind GeoLite Country database.
  4838. o Minor bugfixes (hidden services):
  4839. - Don't close hidden service client circuits which have almost
  4840. finished connecting to their destination when they reach
  4841. the normal circuit-build timeout. Previously, we would close
  4842. introduction circuits which are waiting for an acknowledgement
  4843. from the introduction point, and rendezvous circuits which have
  4844. been specified in an INTRODUCE1 cell sent to a hidden service,
  4845. after the normal CBT. Now, we mark them as 'timed out', and launch
  4846. another rendezvous attempt in parallel. This behavior change can
  4847. be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
  4848. option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
  4849. - Don't close hidden-service-side rendezvous circuits when they
  4850. reach the normal circuit-build timeout. This behaviour change can
  4851. be disabled using the new
  4852. CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
  4853. remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
  4854. - Make sure we never mark the wrong rendezvous circuit as having
  4855. had its introduction cell acknowleged by the introduction-point
  4856. relay. Previously, when we received an INTRODUCE_ACK cell on a
  4857. client-side hidden-service introduction circuit, we might have
  4858. marked a rendezvous circuit other than the one we specified in
  4859. the INTRODUCE1 cell as INTRO_ACKED, which would have produced
  4860. a warning message and interfered with the hidden service
  4861. connection-establishment process. Fixes bug 4759; bugfix on
  4862. 0.2.3.3-alpha, when we added the stream-isolation feature which
  4863. might cause Tor to open multiple rendezvous circuits for the same
  4864. hidden service.
  4865. - Don't trigger an assertion failure when we mark a new client-side
  4866. hidden-service introduction circuit for close during the process
  4867. of creating it. Fixes bug 4796; bugfix on 0.2.3.6-alpha. Reported
  4868. by murb.
  4869. o Minor bugfixes (log messages):
  4870. - Correctly spell "connect" in a log message on failure to create a
  4871. controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta and
  4872. 0.2.3.2-alpha.
  4873. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  4874. Fixes bug 4856; bugfix on Tor 0.0.6.
  4875. - Fix the log message describing how we work around discovering
  4876. that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
  4877. 4837; bugfix on 0.2.2.9-alpha.
  4878. - When logging about a disallowed .exit name, do not also call it
  4879. an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
  4880. o Minor bugfixes (build fixes):
  4881. - During configure, detect when we're building with clang version
  4882. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  4883. CFLAGS. clang doesn't support them yet.
  4884. - During configure, search for library containing cos function as
  4885. libm lives in libcore on some platforms (BeOS/Haiku). Linking
  4886. against libm was hard-coded before. Fixes the first part of bug
  4887. 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
  4888. Pedersen.
  4889. - Detect attempts to build Tor on (as yet hypothetical) versions
  4890. of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
  4891. fix for bug 4533. Bugfix on 0.2.2.28-beta.
  4892. - Preprocessor directives should not be put inside the arguments
  4893. of a macro. This would break compilation with GCC releases prior
  4894. to version 3.3. We would never recommend such an old GCC version,
  4895. but it is apparently required for binary compatibility on some
  4896. platforms (namely, certain builds of Haiku). Fixes the other part
  4897. of bug 4727; bugfix on 0.2.3.3-alpha. Patch and analysis by Martin
  4898. Hebnes Pedersen.
  4899. o Minor bugfixes (other):
  4900. - Older Linux kernels erroneously respond to strange nmap behavior
  4901. by having accept() return successfully with a zero-length
  4902. socket. When this happens, just close the connection. Previously,
  4903. we would try harder to learn the remote address: but there was
  4904. no such remote address to learn, and our method for trying to
  4905. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  4906. on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
  4907. - Fix null-pointer access that could occur if TLS allocation failed.
  4908. Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un". This was
  4909. erroneously listed as fixed in 0.2.3.9-alpha, but the fix had
  4910. accidentally been reverted.
  4911. - Fix our implementation of crypto_random_hostname() so it can't
  4912. overflow on ridiculously large inputs. (No Tor version has ever
  4913. provided this kind of bad inputs, but let's be correct in depth.)
  4914. Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
  4915. - Find more places in the code that should have been testing for
  4916. invalid sockets using the SOCKET_OK macro. Required for a fix
  4917. for bug 4533. Bugfix on 0.2.2.28-beta.
  4918. - Fix an assertion failure when, while running with bufferevents, a
  4919. connection finishes connecting after it is marked for close, but
  4920. before it is closed. Fixes bug 4697; bugfix on 0.2.3.1-alpha.
  4921. - test_util_spawn_background_ok() hardcoded the expected value
  4922. for ENOENT to 2. This isn't portable as error numbers are
  4923. platform specific, and particularly the hurd has ENOENT at
  4924. 0x40000002. Construct expected string at runtime, using the correct
  4925. value for ENOENT. Fixes bug 4733; bugfix on 0.2.3.1-alpha.
  4926. - Reject attempts to disable DisableDebuggerAttachment while Tor is
  4927. running. Fixes bug 4650; bugfix on 0.2.3.9-alpha.
  4928. - Use an appropriate-width type for sockets in tor-fw-helper on
  4929. win64. Fixes bug 1983 at last. Bugfix on 0.2.3.9-alpha.
  4930. o Feature removal:
  4931. - When sending or relaying a RELAY_EARLY cell, we used to convert
  4932. it to a RELAY cell if the connection was using the v1 link
  4933. protocol. This was a workaround for older versions of Tor, which
  4934. didn't handle RELAY_EARLY cells properly. Now that all supported
  4935. versions can handle RELAY_EARLY cells, and now that we're enforcing
  4936. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  4937. remove this workaround. Addresses bug 4786.
  4938. o Code simplifications and refactoring:
  4939. - Use OpenSSL's built-in SSL_state_string_long() instead of our
  4940. own homebrewed ssl_state_to_string() replacement. Patch from
  4941. Emile Snyder. Fixes bug 4653.
  4942. - Use macros to indicate OpenSSL versions, so we don't need to worry
  4943. about accidental hexadecimal bit shifts.
  4944. - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
  4945. supported).
  4946. - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
  4947. - Use the smartlist_add_asprintf() alias more consistently.
  4948. - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
  4949. invalid value, rather than just -1.
  4950. - Rename a handful of old identifiers, mostly related to crypto
  4951. structures and crypto functions. By convention, our "create an
  4952. object" functions are called "type_new()", our "free an object"
  4953. functions are called "type_free()", and our types indicate that
  4954. they are types only with a final "_t". But a handful of older
  4955. types and functions broke these rules, with function names like
  4956. "type_create" or "subsystem_op_type", or with type names like
  4957. type_env_t.
  4958. Changes in version 0.2.3.10-alpha - 2011-12-16
  4959. Tor 0.2.3.10-alpha fixes a critical heap-overflow security issue in
  4960. Tor's buffers code. Absolutely everybody should upgrade.
  4961. The bug relied on an incorrect calculation when making data continuous
  4962. in one of our IO buffers, if the first chunk of the buffer was
  4963. misaligned by just the wrong amount. The miscalculation would allow an
  4964. attacker to overflow a piece of heap-allocated memory. To mount this
  4965. attack, the attacker would need to either open a SOCKS connection to
  4966. Tor's SocksPort (usually restricted to localhost), or target a Tor
  4967. instance configured to make its connections through a SOCKS proxy
  4968. (which Tor does not do by default).
  4969. Good security practice requires that all heap-overflow bugs should be
  4970. presumed to be exploitable until proven otherwise, so we are treating
  4971. this as a potential code execution attack. Please upgrade immediately!
  4972. This bug does not affect bufferevents-based builds of Tor. Special
  4973. thanks to "Vektor" for reporting this issue to us!
  4974. This release also contains a few minor bugfixes for issues discovered
  4975. in 0.2.3.9-alpha.
  4976. o Major bugfixes:
  4977. - Fix a heap overflow bug that could occur when trying to pull
  4978. data into the first chunk of a buffer, when that chunk had
  4979. already had some data drained from it. Fixes CVE-2011-2778;
  4980. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  4981. o Minor bugfixes:
  4982. - If we can't attach streams to a rendezvous circuit when we
  4983. finish connecting to a hidden service, clear the rendezvous
  4984. circuit's stream-isolation state and try to attach streams
  4985. again. Previously, we cleared rendezvous circuits' isolation
  4986. state either too early (if they were freshly built) or not at all
  4987. (if they had been built earlier and were cannibalized). Bugfix on
  4988. 0.2.3.3-alpha; fixes bug 4655.
  4989. - Fix compilation of the libnatpmp helper on non-Windows. Bugfix on
  4990. 0.2.3.9-alpha; fixes bug 4691. Reported by Anthony G. Basile.
  4991. - Fix an assertion failure when a relay with accounting enabled
  4992. starts up while dormant. Fixes bug 4702; bugfix on 0.2.3.9-alpha.
  4993. o Minor features:
  4994. - Update to the December 6 2011 Maxmind GeoLite Country database.
  4995. Changes in version 0.2.2.35 - 2011-12-16
  4996. Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
  4997. buffers code. Absolutely everybody should upgrade.
  4998. The bug relied on an incorrect calculation when making data continuous
  4999. in one of our IO buffers, if the first chunk of the buffer was
  5000. misaligned by just the wrong amount. The miscalculation would allow an
  5001. attacker to overflow a piece of heap-allocated memory. To mount this
  5002. attack, the attacker would need to either open a SOCKS connection to
  5003. Tor's SocksPort (usually restricted to localhost), or target a Tor
  5004. instance configured to make its connections through a SOCKS proxy
  5005. (which Tor does not do by default).
  5006. Good security practice requires that all heap-overflow bugs should be
  5007. presumed to be exploitable until proven otherwise, so we are treating
  5008. this as a potential code execution attack. Please upgrade immediately!
  5009. This bug does not affect bufferevents-based builds of Tor. Special
  5010. thanks to "Vektor" for reporting this issue to us!
  5011. Tor 0.2.2.35 also fixes several bugs in previous versions, including
  5012. crash bugs for unusual configurations, and a long-term bug that
  5013. would prevent Tor from starting on Windows machines with draconian
  5014. AV software.
  5015. With this release, we remind everyone that 0.2.0.x has reached its
  5016. formal end-of-life. Those Tor versions have many known flaws, and
  5017. nobody should be using them. You should upgrade -- ideally to the
  5018. 0.2.2.x series. If you're using a Linux or BSD and its packages are
  5019. obsolete, stop using those packages and upgrade anyway.
  5020. The Tor 0.2.1.x series is also approaching its end-of-life: it will no
  5021. longer receive support after some time in early 2012.
  5022. o Major bugfixes:
  5023. - Fix a heap overflow bug that could occur when trying to pull
  5024. data into the first chunk of a buffer, when that chunk had
  5025. already had some data drained from it. Fixes CVE-2011-2778;
  5026. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  5027. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  5028. that it doesn't attempt to allocate a socketpair. This could cause
  5029. some problems on Windows systems with overzealous firewalls. Fix for
  5030. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  5031. 2.0.15-stable.
  5032. - If we mark an OR connection for close based on a cell we process,
  5033. don't process any further cells on it. We already avoid further
  5034. reads on marked-for-close connections, but now we also discard the
  5035. cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
  5036. which was the first version where we might mark a connection for
  5037. close based on processing a cell on it.
  5038. - Correctly sanity-check that we don't underflow on a memory
  5039. allocation (and then assert) for hidden service introduction
  5040. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  5041. bugfix on 0.2.1.5-alpha.
  5042. - Fix a memory leak when we check whether a hidden service
  5043. descriptor has any usable introduction points left. Fixes bug
  5044. 4424. Bugfix on 0.2.2.25-alpha.
  5045. - Don't crash when we're running as a relay and don't have a GeoIP
  5046. file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
  5047. we've had in the 0.2.3.x branch already.
  5048. - When running as a client, do not print a misleading (and plain
  5049. wrong) log message that we're collecting "directory request"
  5050. statistics: clients don't collect statistics. Also don't create a
  5051. useless (because empty) stats file in the stats/ directory. Fixes
  5052. bug 4353; bugfix on 0.2.2.34.
  5053. o Minor bugfixes:
  5054. - Detect failure to initialize Libevent. This fix provides better
  5055. detection for future instances of bug 4457.
  5056. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  5057. function. This was eating up hideously large amounts of time on some
  5058. busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
  5059. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  5060. Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
  5061. Mansour Moufid.
  5062. - Don't warn about unused log_mutex in log.c when building with
  5063. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  5064. 0.1.0.6-rc which introduced --disable-threads.
  5065. - When configuring, starting, or stopping an NT service, stop
  5066. immediately after the service configuration attempt has succeeded
  5067. or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
  5068. - When sending a NETINFO cell, include the original address
  5069. received for the other side, not its canonical address. Found
  5070. by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
  5071. - Fix a typo in a hibernation-related log message. Fixes bug 4331;
  5072. bugfix on 0.2.2.23-alpha; found by "tmpname0901".
  5073. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  5074. occurred when a client tried to fetch a descriptor for a bridge
  5075. in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
  5076. - Backport fixes for a pair of compilation warnings on Windows.
  5077. Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
  5078. - If we had ever tried to call tor_addr_to_str on an address of
  5079. unknown type, we would have done a strdup on an uninitialized
  5080. buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
  5081. Reported by "troll_un".
  5082. - Correctly detect and handle transient lookup failures from
  5083. tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
  5084. Reported by "troll_un".
  5085. - Fix null-pointer access that could occur if TLS allocation failed.
  5086. Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
  5087. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  5088. 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
  5089. o Minor features:
  5090. - Add two new config options for directory authorities:
  5091. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  5092. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  5093. that is always sufficient to satisfy the bandwidth requirement for
  5094. the Guard flag. Now it will be easier for researchers to simulate
  5095. Tor networks with different values. Resolves ticket 4484.
  5096. - When Tor ignores a hidden service specified in its configuration,
  5097. include the hidden service's directory in the warning message.
  5098. Previously, we would only tell the user that some hidden service
  5099. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  5100. - Update to the December 6 2011 Maxmind GeoLite Country database.
  5101. o Packaging changes:
  5102. - Make it easier to automate expert package builds on Windows,
  5103. by removing an absolute path from makensis.exe command.
  5104. Changes in version 0.2.1.32 - 2011-12-16
  5105. Tor 0.2.1.32 backports important security and privacy fixes for
  5106. oldstable. This release is intended only for package maintainers and
  5107. others who cannot use the 0.2.2 stable series. All others should be
  5108. using Tor 0.2.2.x or newer.
  5109. The Tor 0.2.1.x series will reach formal end-of-life some time in
  5110. early 2012; we will stop releasing patches for it then.
  5111. o Major bugfixes (also included in 0.2.2.x):
  5112. - Correctly sanity-check that we don't underflow on a memory
  5113. allocation (and then assert) for hidden service introduction
  5114. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  5115. bugfix on 0.2.1.5-alpha.
  5116. - Fix a heap overflow bug that could occur when trying to pull
  5117. data into the first chunk of a buffer, when that chunk had
  5118. already had some data drained from it. Fixes CVE-2011-2778;
  5119. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  5120. o Minor features:
  5121. - Update to the December 6 2011 Maxmind GeoLite Country database.
  5122. Changes in version 0.2.3.9-alpha - 2011-12-08
  5123. Tor 0.2.3.9-alpha introduces initial IPv6 support for bridges, adds
  5124. a "DisableNetwork" security feature that bundles can use to avoid
  5125. touching the network until bridges are configured, moves forward on
  5126. the pluggable transport design, fixes a flaw in the hidden service
  5127. design that unnecessarily prevented clients with wrong clocks from
  5128. reaching hidden services, and fixes a wide variety of other issues.
  5129. o Major features:
  5130. - Clients can now connect to private bridges over IPv6. Bridges
  5131. still need at least one IPv4 address in order to connect to
  5132. other relays. Note that we don't yet handle the case where the
  5133. user has two bridge lines for the same bridge (one IPv4, one
  5134. IPv6). Implements parts of proposal 186.
  5135. - New "DisableNetwork" config option to prevent Tor from launching any
  5136. connections or accepting any connections except on a control port.
  5137. Bundles and controllers can set this option before letting Tor talk
  5138. to the rest of the network, for example to prevent any connections
  5139. to a non-bridge address. Packages like Orbot can also use this
  5140. option to instruct Tor to save power when the network is off.
  5141. - Clients and bridges can now be configured to use a separate
  5142. "transport" proxy. This approach makes the censorship arms race
  5143. easier by allowing bridges to use protocol obfuscation plugins. It
  5144. implements the "managed proxy" part of proposal 180 (ticket 3472).
  5145. - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
  5146. implementation. It makes AES_CTR about 7% faster than our old one
  5147. (which was about 10% faster than the one OpenSSL used to provide).
  5148. Resolves ticket 4526.
  5149. - Add a "tor2web mode" for clients that want to connect to hidden
  5150. services non-anonymously (and possibly more quickly). As a safety
  5151. measure to try to keep users from turning this on without knowing
  5152. what they are doing, tor2web mode must be explicitly enabled at
  5153. compile time, and a copy of Tor compiled to run in tor2web mode
  5154. cannot be used as a normal Tor client. Implements feature 2553.
  5155. - Add experimental support for running on Windows with IOCP and no
  5156. kernel-space socket buffers. This feature is controlled by a new
  5157. "UserspaceIOCPBuffers" config option (off by default), which has
  5158. no effect unless Tor has been built with support for bufferevents,
  5159. is running on Windows, and has enabled IOCP. This may, in the long
  5160. run, help solve or mitigate bug 98.
  5161. - Use a more secure consensus parameter voting algorithm. Now at
  5162. least three directory authorities or a majority of them must
  5163. vote on a given parameter before it will be included in the
  5164. consensus. Implements proposal 178.
  5165. o Major bugfixes:
  5166. - Hidden services now ignore the timestamps on INTRODUCE2 cells.
  5167. They used to check that the timestamp was within 30 minutes
  5168. of their system clock, so they could cap the size of their
  5169. replay-detection cache, but that approach unnecessarily refused
  5170. service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
  5171. the v3 intro-point protocol (the first one which sent a timestamp
  5172. field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
  5173. - Only use the EVP interface when AES acceleration is enabled,
  5174. to avoid a 5-7% performance regression. Resolves issue 4525;
  5175. bugfix on 0.2.3.8-alpha.
  5176. o Privacy/anonymity features (bridge detection):
  5177. - Make bridge SSL certificates a bit more stealthy by using random
  5178. serial numbers, in the same fashion as OpenSSL when generating
  5179. self-signed certificates. Implements ticket 4584.
  5180. - Introduce a new config option "DynamicDHGroups", enabled by
  5181. default, which provides each bridge with a unique prime DH modulus
  5182. to be used during SSL handshakes. This option attempts to help
  5183. against censors who might use the Apache DH modulus as a static
  5184. identifier for bridges. Addresses ticket 4548.
  5185. o Minor features (new/different config options):
  5186. - New configuration option "DisableDebuggerAttachment" (on by default)
  5187. to prevent basic debugging attachment attempts by other processes.
  5188. Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
  5189. - Allow MapAddress directives to specify matches against super-domains,
  5190. as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
  5191. Implements issue 933.
  5192. - Slightly change behavior of "list" options (that is, config
  5193. options that can appear more than once) when they appear both in
  5194. torrc and on the command line. Previously, the command-line options
  5195. would be appended to the ones from torrc. Now, the command-line
  5196. options override the torrc options entirely. This new behavior
  5197. allows the user to override list options (like exit policies and
  5198. ports to listen on) from the command line, rather than simply
  5199. appending to the list.
  5200. - You can get the old (appending) command-line behavior for "list"
  5201. options by prefixing the option name with a "+".
  5202. - You can remove all the values for a "list" option from the command
  5203. line without adding any new ones by prefixing the option name
  5204. with a "/".
  5205. - Add experimental support for a "defaults" torrc file to be parsed
  5206. before the regular torrc. Torrc options override the defaults file's
  5207. options in the same way that the command line overrides the torrc.
  5208. The SAVECONF controller command saves only those options which
  5209. differ between the current configuration and the defaults file. HUP
  5210. reloads both files. (Note: This is an experimental feature; its
  5211. behavior will probably be refined in future 0.2.3.x-alpha versions
  5212. to better meet packagers' needs.) Implements task 4552.
  5213. o Minor features:
  5214. - Try to make the introductory warning message that Tor prints on
  5215. startup more useful for actually finding help and information.
  5216. Resolves ticket 2474.
  5217. - Running "make version" now displays the version of Tor that
  5218. we're about to build. Idea from katmagic; resolves issue 4400.
  5219. - Expire old or over-used hidden service introduction points.
  5220. Required by fix for bug 3460.
  5221. - Move the replay-detection cache for the RSA-encrypted parts of
  5222. INTRODUCE2 cells to the introduction point data structures.
  5223. Previously, we would use one replay-detection cache per hidden
  5224. service. Required by fix for bug 3460.
  5225. - Reduce the lifetime of elements of hidden services' Diffie-Hellman
  5226. public key replay-detection cache from 60 minutes to 5 minutes. This
  5227. replay-detection cache is now used only to detect multiple
  5228. INTRODUCE2 cells specifying the same rendezvous point, so we can
  5229. avoid launching multiple simultaneous attempts to connect to it.
  5230. o Minor bugfixes (on Tor 0.2.2.x and earlier):
  5231. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  5232. Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
  5233. Mansour Moufid.
  5234. - Fix a minor formatting issue in one of tor-gencert's error messages.
  5235. Fixes bug 4574.
  5236. - Prevent a false positive from the check-spaces script, by disabling
  5237. the "whitespace between function name and (" check for functions
  5238. named 'op()'.
  5239. - Fix a log message suggesting that people contact a non-existent
  5240. email address. Fixes bug 3448.
  5241. - Fix null-pointer access that could occur if TLS allocation failed.
  5242. Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
  5243. - Report a real bootstrap problem to the controller on router
  5244. identity mismatch. Previously we just said "foo", which probably
  5245. made a lot of sense at the time. Fixes bug 4169; bugfix on
  5246. 0.2.1.1-alpha.
  5247. - If we had ever tried to call tor_addr_to_str() on an address of
  5248. unknown type, we would have done a strdup() on an uninitialized
  5249. buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
  5250. Reported by "troll_un".
  5251. - Correctly detect and handle transient lookup failures from
  5252. tor_addr_lookup(). Fixes bug 4530; bugfix on 0.2.1.5-alpha.
  5253. Reported by "troll_un".
  5254. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  5255. 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
  5256. - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
  5257. bug 4532; found by "troll_un".
  5258. o Minor bugfixes (on Tor 0.2.3.x):
  5259. - Fix a compile warning in tor_inet_pton(). Bugfix on 0.2.3.8-alpha;
  5260. fixes bug 4554.
  5261. - Don't send two ESTABLISH_RENDEZVOUS cells when opening a new
  5262. circuit for use as a hidden service client's rendezvous point.
  5263. Fixes bugs 4641 and 4171; bugfix on 0.2.3.3-alpha. Diagnosed
  5264. with help from wanoskarnet.
  5265. - Restore behavior of overriding SocksPort, ORPort, and similar
  5266. options from the command line. Bugfix on 0.2.3.3-alpha.
  5267. o Build fixes:
  5268. - Properly handle the case where the build-tree is not the same
  5269. as the source tree when generating src/common/common_sha1.i,
  5270. src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
  5271. bugfix on 0.2.0.1-alpha.
  5272. o Code simplifications, cleanups, and refactorings:
  5273. - Remove the pure attribute from all functions that used it
  5274. previously. In many cases we assigned it incorrectly, because the
  5275. functions might assert or call impure functions, and we don't have
  5276. evidence that keeping the pure attribute is worthwhile. Implements
  5277. changes suggested in ticket 4421.
  5278. - Remove some dead code spotted by coverity. Fixes cid 432.
  5279. Bugfix on 0.2.3.1-alpha, closes bug 4637.
  5280. Changes in version 0.2.3.8-alpha - 2011-11-22
  5281. Tor 0.2.3.8-alpha fixes some crash and assert bugs, including a
  5282. socketpair-related bug that has been bothering Windows users. It adds
  5283. support to serve microdescriptors to controllers, so Vidalia's network
  5284. map can resume listing relays (once Vidalia implements its side),
  5285. and adds better support for hardware AES acceleration. Finally, it
  5286. starts the process of adjusting the bandwidth cutoff for getting the
  5287. "Fast" flag from 20KB to (currently) 32KB -- preliminary results show
  5288. that tiny relays harm performance more than they help network capacity.
  5289. o Major bugfixes:
  5290. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  5291. that it doesn't attempt to allocate a socketpair. This could cause
  5292. some problems on Windows systems with overzealous firewalls. Fix for
  5293. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  5294. 2.0.15-stable.
  5295. - Correctly sanity-check that we don't underflow on a memory
  5296. allocation (and then assert) for hidden service introduction
  5297. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  5298. bugfix on 0.2.1.5-alpha.
  5299. - Remove the artificially low cutoff of 20KB to guarantee the Fast
  5300. flag. In the past few years the average relay speed has picked
  5301. up, and while the "top 7/8 of the network get the Fast flag" and
  5302. "all relays with 20KB or more of capacity get the Fast flag" rules
  5303. used to have the same result, now the top 7/8 of the network has
  5304. a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
  5305. - Fix a rare assertion failure when checking whether a v0 hidden
  5306. service descriptor has any usable introduction points left, and
  5307. we don't have enough information to build a circuit to the first
  5308. intro point named in the descriptor. The HS client code in
  5309. 0.2.3.x no longer uses v0 HS descriptors, but this assertion can
  5310. trigger on (and crash) v0 HS authorities. Fixes bug 4411.
  5311. Bugfix on 0.2.3.1-alpha; diagnosed by frosty_un.
  5312. - Make bridge authorities not crash when they are asked for their own
  5313. descriptor. Bugfix on 0.2.3.7-alpha, reported by Lucky Green.
  5314. - When running as a client, do not print a misleading (and plain
  5315. wrong) log message that we're collecting "directory request"
  5316. statistics: clients don't collect statistics. Also don't create a
  5317. useless (because empty) stats file in the stats/ directory. Fixes
  5318. bug 4353; bugfix on 0.2.2.34 and 0.2.3.7-alpha.
  5319. o Major features:
  5320. - Allow Tor controllers like Vidalia to obtain the microdescriptor
  5321. for a relay by identity digest or nickname. Previously,
  5322. microdescriptors were only available by their own digests, so a
  5323. controller would have to ask for and parse the whole microdescriptor
  5324. consensus in order to look up a single relay's microdesc. Fixes
  5325. bug 3832; bugfix on 0.2.3.1-alpha.
  5326. - Use OpenSSL's EVP interface for AES encryption, so that all AES
  5327. operations can use hardware acceleration (if present). Resolves
  5328. ticket 4442.
  5329. o Minor bugfixes (on 0.2.2.x and earlier):
  5330. - Detect failure to initialize Libevent. This fix provides better
  5331. detection for future instances of bug 4457.
  5332. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  5333. function. This was eating up hideously large amounts of time on some
  5334. busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
  5335. - Don't warn about unused log_mutex in log.c when building with
  5336. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  5337. 0.1.0.6-rc which introduced --disable-threads.
  5338. - Allow manual 'authenticate' commands to the controller interface
  5339. from netcat (nc) as well as telnet. We were rejecting them because
  5340. they didn't come with the expected whitespace at the end of the
  5341. command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
  5342. - Fix some (not actually triggerable) buffer size checks in usage of
  5343. tor_inet_ntop. Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
  5344. by Anders Sundman.
  5345. - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
  5346. bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
  5347. - When configuring, starting, or stopping an NT service, stop
  5348. immediately after the service configuration attempt has succeeded
  5349. or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
  5350. - When sending a NETINFO cell, include the original address
  5351. received for the other side, not its canonical address. Found
  5352. by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
  5353. - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
  5354. can pick them up when the tests aren't disabled. Bugfix on
  5355. 0.2.2.4-alpha which introduced tinytest.
  5356. - Fix a memory leak when we check whether a hidden service
  5357. descriptor has any usable introduction points left. Fixes bug
  5358. 4424. Bugfix on 0.2.2.25-alpha.
  5359. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  5360. occurred when a client tried to fetch a descriptor for a bridge
  5361. in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
  5362. o Minor bugfixes (on 0.2.3.x):
  5363. - Make util unit tests build correctly with MSVC. Bugfix on
  5364. 0.2.3.3-alpha. Patch by Gisle Vanem.
  5365. - Successfully detect AUTH_CHALLENGE cells with no recognized
  5366. authentication type listed. Fixes bug 4367; bugfix on 0.2.3.6-alpha.
  5367. Found by frosty_un.
  5368. - If a relay receives an AUTH_CHALLENGE cell it can't answer,
  5369. it should still send a NETINFO cell to allow the connection to
  5370. become open. Fixes bug 4368; fix on 0.2.3.6-alpha; bug found by
  5371. "frosty".
  5372. - Log less loudly when we get an invalid authentication certificate
  5373. from a source other than a directory authority: it's not unusual
  5374. to see invalid certs because of clock skew. Fixes bug 4370; bugfix
  5375. on 0.2.3.6-alpha.
  5376. - Tolerate servers with more clock skew in their authentication
  5377. certificates than previously. Fixes bug 4371; bugfix on
  5378. 0.2.3.6-alpha.
  5379. - Fix a couple of compile warnings on Windows. Fixes bug 4469; bugfix
  5380. on 0.2.3.4-alpha and 0.2.3.6-alpha.
  5381. o Minor features:
  5382. - Add two new config options for directory authorities:
  5383. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  5384. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  5385. that is always sufficient to satisfy the bandwidth requirement for
  5386. the Guard flag. Now it will be easier for researchers to simulate
  5387. Tor networks with different values. Resolves ticket 4484.
  5388. - When Tor ignores a hidden service specified in its configuration,
  5389. include the hidden service's directory in the warning message.
  5390. Previously, we would only tell the user that some hidden service
  5391. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  5392. - When we fail to initialize Libevent, retry with IOCP disabled so we
  5393. don't need to turn on multi-threading support in Libevent, which in
  5394. turn requires a working socketpair(). This is a workaround for bug
  5395. 4457, which affects Libevent versions from 2.0.1-alpha through
  5396. 2.0.15-stable.
  5397. - Detect when we try to build on a platform that doesn't define
  5398. AF_UNSPEC to 0. We don't work there, so refuse to compile.
  5399. - Update to the November 1 2011 Maxmind GeoLite Country database.
  5400. o Packaging changes:
  5401. - Make it easier to automate expert package builds on Windows,
  5402. by removing an absolute path from makensis.exe command.
  5403. o Code simplifications and refactoring:
  5404. - Remove some redundant #include directives throughout the code.
  5405. Patch from Andrea Gelmini.
  5406. - Unconditionally use OpenSSL's AES implementation instead of our
  5407. old built-in one. OpenSSL's AES has been better for a while, and
  5408. relatively few servers should still be on any version of OpenSSL
  5409. that doesn't have good optimized assembly AES.
  5410. - Use the name "CERTS" consistently to refer to the new cell type;
  5411. we were calling it CERT in some places and CERTS in others.
  5412. o Testing:
  5413. - Numerous new unit tests for functions in util.c and address.c by
  5414. Anders Sundman.
  5415. - The long-disabled benchmark tests are now split into their own
  5416. ./src/test/bench binary.
  5417. - The benchmark tests can now use more accurate timers than
  5418. gettimeofday() when such timers are available.
  5419. Changes in version 0.2.3.7-alpha - 2011-10-30
  5420. Tor 0.2.3.7-alpha fixes a crash bug in 0.2.3.6-alpha introduced by
  5421. the new v3 handshake. It also resolves yet another bridge address
  5422. enumeration issue.
  5423. o Major bugfixes:
  5424. - If we mark an OR connection for close based on a cell we process,
  5425. don't process any further cells on it. We already avoid further
  5426. reads on marked-for-close connections, but now we also discard the
  5427. cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
  5428. which was the first version where we might mark a connection for
  5429. close based on processing a cell on it.
  5430. - Fix a double-free bug that would occur when we received an invalid
  5431. certificate in a CERT cell in the new v3 handshake. Fixes bug 4343;
  5432. bugfix on 0.2.3.6-alpha.
  5433. - Bridges no longer include their address in NETINFO cells on outgoing
  5434. OR connections, to allow them to blend in better with clients.
  5435. Removes another avenue for enumerating bridges. Reported by
  5436. "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
  5437. cells were introduced.
  5438. o Trivial fixes:
  5439. - Fixed a typo in a hibernation-related log message. Fixes bug 4331;
  5440. bugfix on 0.2.2.23-alpha; found by "tmpname0901".
  5441. Changes in version 0.2.3.6-alpha - 2011-10-26
  5442. Tor 0.2.3.6-alpha includes the fix from 0.2.2.34 for a critical
  5443. anonymity vulnerability where an attacker can deanonymize Tor
  5444. users. Everybody should upgrade.
  5445. This release also features support for a new v3 connection handshake
  5446. protocol, and fixes to make hidden service connections more robust.
  5447. o Major features:
  5448. - Implement a new handshake protocol (v3) for authenticating Tors to
  5449. each other over TLS. It should be more resistant to fingerprinting
  5450. than previous protocols, and should require less TLS hacking for
  5451. future Tor implementations. Implements proposal 176.
  5452. - Allow variable-length padding cells to disguise the length of
  5453. Tor's TLS records. Implements part of proposal 184.
  5454. o Privacy/anonymity fixes (clients):
  5455. - Clients and bridges no longer send TLS certificate chains on
  5456. outgoing OR connections. Previously, each client or bridge would
  5457. use the same cert chain for all outgoing OR connections until
  5458. its IP address changes, which allowed any relay that the client
  5459. or bridge contacted to determine which entry guards it is using.
  5460. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  5461. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  5462. no longer considers that connection as suitable for satisfying a
  5463. circuit EXTEND request. Now relays can protect clients from the
  5464. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  5465. - Directory authorities no longer assign the Guard flag to relays
  5466. that haven't upgraded to the above "refuse EXTEND requests
  5467. to client connections" fix. Now directory authorities can
  5468. protect clients from the CVE-2011-2768 issue even if neither
  5469. the clients nor the relays have upgraded yet. There's a new
  5470. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  5471. to let us transition smoothly, else tomorrow there would be no
  5472. guard relays.
  5473. o Major bugfixes (hidden services):
  5474. - Improve hidden service robustness: when an attempt to connect to
  5475. a hidden service ends, be willing to refetch its hidden service
  5476. descriptors from each of the HSDir relays responsible for them
  5477. immediately. Previously, we would not consider refetching the
  5478. service's descriptors from each HSDir for 15 minutes after the last
  5479. fetch, which was inconvenient if the hidden service was not running
  5480. during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
  5481. - When one of a hidden service's introduction points appears to be
  5482. unreachable, stop trying it. Previously, we would keep trying
  5483. to build circuits to the introduction point until we lost the
  5484. descriptor, usually because the user gave up and restarted Tor.
  5485. Partly fixes bug 3825.
  5486. - Don't launch a useless circuit after failing to use one of a
  5487. hidden service's introduction points. Previously, we would
  5488. launch a new introduction circuit, but not set the hidden service
  5489. which that circuit was intended to connect to, so it would never
  5490. actually be used. A different piece of code would then create a
  5491. new introduction circuit correctly. Bug reported by katmagic and
  5492. found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
  5493. o Major bugfixes (other):
  5494. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  5495. that they initiated. Relays could distinguish incoming bridge
  5496. connections from client connections, creating another avenue for
  5497. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  5498. Found by "frosty_un".
  5499. - Don't update the AccountingSoftLimitHitAt state file entry whenever
  5500. tor gets started. This prevents a wrong average bandwidth
  5501. estimate, which would cause relays to always start a new accounting
  5502. interval at the earliest possible moment. Fixes bug 2003; bugfix
  5503. on 0.2.2.7-alpha. Reported by BryonEldridge, who also helped
  5504. immensely in tracking this bug down.
  5505. - Fix a crash bug when changing node restrictions while a DNS lookup
  5506. is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
  5507. by "Tey'".
  5508. o Minor bugfixes (on 0.2.2.x and earlier):
  5509. - When a hidden service turns an extra service-side introduction
  5510. circuit into a general-purpose circuit, free the rend_data and
  5511. intro_key fields first, so we won't leak memory if the circuit
  5512. is cannibalized for use as another service-side introduction
  5513. circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
  5514. - Rephrase the log message emitted if the TestSocks check is
  5515. successful. Patch from Fabian Keil; fixes bug 4094.
  5516. - Bridges now skip DNS self-tests, to act a little more stealthily.
  5517. Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
  5518. bridges. Patch by "warms0x".
  5519. - Remove a confusing dollar sign from the example fingerprint in the
  5520. man page, and also make the example fingerprint a valid one. Fixes
  5521. bug 4309; bugfix on 0.2.1.3-alpha.
  5522. - Fix internal bug-checking logic that was supposed to catch
  5523. failures in digest generation so that it will fail more robustly
  5524. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  5525. Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
  5526. - Report any failure in init_keys() calls launched because our
  5527. IP address has changed. Spotted by Coverity Scan. Bugfix on
  5528. 0.1.1.4-alpha; fixes CID 484.
  5529. o Minor bugfixes (on 0.2.3.x):
  5530. - Fix a bug in configure.in that kept it from building a configure
  5531. script with autoconf versions earlier than 2.61. Fixes bug 2430;
  5532. bugfix on 0.2.3.1-alpha.
  5533. - Don't warn users that they are exposing a client port to the
  5534. Internet if they have specified an RFC1918 address. Previously,
  5535. we would warn if the user had specified any non-loopback
  5536. address. Bugfix on 0.2.3.3-alpha. Fixes bug 4018; reported by Tas.
  5537. - Fix memory leaks in the failing cases of the new SocksPort and
  5538. ControlPort code. Found by Coverity Scan. Bugfix on 0.2.3.3-alpha;
  5539. fixes coverity CIDs 485, 486, and 487.
  5540. o Minor features:
  5541. - When a hidden service's introduction point times out, consider
  5542. trying it again during the next attempt to connect to the
  5543. HS. Previously, we would not try it again unless a newly fetched
  5544. descriptor contained it. Required by fixes for bugs 1297 and 3825.
  5545. - The next version of Windows will be called Windows 8, and it has
  5546. a major version of 6, minor version of 2. Correctly identify that
  5547. version instead of calling it "Very recent version". Resolves
  5548. ticket 4153; reported by funkstar.
  5549. - The Bridge Authority now writes statistics on how many bridge
  5550. descriptors it gave out in total, and how many unique descriptors
  5551. it gave out. It also lists how often the most and least commonly
  5552. fetched descriptors were given out, as well as the median and
  5553. 25th/75th percentile. Implements tickets 4200 and 4294.
  5554. - Update to the October 4 2011 Maxmind GeoLite Country database.
  5555. o Code simplifications and refactoring:
  5556. - Remove some old code to remember statistics about which descriptors
  5557. we've served as a directory mirror. The feature wasn't used and
  5558. is outdated now that microdescriptors are around.
  5559. - Rename Tor functions that turn strings into addresses, so that
  5560. "parse" indicates that no hostname resolution occurs, and
  5561. "lookup" indicates that hostname resolution may occur. This
  5562. should help prevent mistakes in the future. Fixes bug 3512.
  5563. Changes in version 0.2.2.34 - 2011-10-26
  5564. Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
  5565. can deanonymize Tor users. Everybody should upgrade.
  5566. The attack relies on four components: 1) Clients reuse their TLS cert
  5567. when talking to different relays, so relays can recognize a user by
  5568. the identity key in her cert. 2) An attacker who knows the client's
  5569. identity key can probe each guard relay to see if that identity key
  5570. is connected to that guard relay right now. 3) A variety of active
  5571. attacks in the literature (starting from "Low-Cost Traffic Analysis
  5572. of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
  5573. discover the guard relays that a Tor user visiting the website is using.
  5574. 4) Clients typically pick three guards at random, so the set of guards
  5575. for a given user could well be a unique fingerprint for her. This
  5576. release fixes components #1 and #2, which is enough to block the attack;
  5577. the other two remain as open research problems. Special thanks to
  5578. "frosty_un" for reporting the issue to us!
  5579. Clients should upgrade so they are no longer recognizable by the TLS
  5580. certs they present. Relays should upgrade so they no longer allow a
  5581. remote attacker to probe them to test whether unpatched clients are
  5582. currently connected to them.
  5583. This release also fixes several vulnerabilities that allow an attacker
  5584. to enumerate bridge relays. Some bridge enumeration attacks still
  5585. remain; see for example proposal 188.
  5586. o Privacy/anonymity fixes (clients):
  5587. - Clients and bridges no longer send TLS certificate chains on
  5588. outgoing OR connections. Previously, each client or bridge would
  5589. use the same cert chain for all outgoing OR connections until
  5590. its IP address changes, which allowed any relay that the client
  5591. or bridge contacted to determine which entry guards it is using.
  5592. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  5593. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  5594. no longer considers that connection as suitable for satisfying a
  5595. circuit EXTEND request. Now relays can protect clients from the
  5596. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  5597. - Directory authorities no longer assign the Guard flag to relays
  5598. that haven't upgraded to the above "refuse EXTEND requests
  5599. to client connections" fix. Now directory authorities can
  5600. protect clients from the CVE-2011-2768 issue even if neither
  5601. the clients nor the relays have upgraded yet. There's a new
  5602. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  5603. to let us transition smoothly, else tomorrow there would be no
  5604. guard relays.
  5605. o Privacy/anonymity fixes (bridge enumeration):
  5606. - Bridge relays now do their directory fetches inside Tor TLS
  5607. connections, like all the other clients do, rather than connecting
  5608. directly to the DirPort like public relays do. Removes another
  5609. avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
  5610. - Bridges relays now build circuits for themselves in a more similar
  5611. way to how clients build them. Removes another avenue for
  5612. enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
  5613. when bridges were introduced.
  5614. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  5615. that they initiated. Relays could distinguish incoming bridge
  5616. connections from client connections, creating another avenue for
  5617. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  5618. Found by "frosty_un".
  5619. o Major bugfixes:
  5620. - Fix a crash bug when changing node restrictions while a DNS lookup
  5621. is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
  5622. by "Tey'".
  5623. - Don't launch a useless circuit after failing to use one of a
  5624. hidden service's introduction points. Previously, we would
  5625. launch a new introduction circuit, but not set the hidden service
  5626. which that circuit was intended to connect to, so it would never
  5627. actually be used. A different piece of code would then create a
  5628. new introduction circuit correctly. Bug reported by katmagic and
  5629. found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
  5630. o Minor bugfixes:
  5631. - Change an integer overflow check in the OpenBSD_Malloc code so
  5632. that GCC is less likely to eliminate it as impossible. Patch
  5633. from Mansour Moufid. Fixes bug 4059.
  5634. - When a hidden service turns an extra service-side introduction
  5635. circuit into a general-purpose circuit, free the rend_data and
  5636. intro_key fields first, so we won't leak memory if the circuit
  5637. is cannibalized for use as another service-side introduction
  5638. circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
  5639. - Bridges now skip DNS self-tests, to act a little more stealthily.
  5640. Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
  5641. bridges. Patch by "warms0x".
  5642. - Fix internal bug-checking logic that was supposed to catch
  5643. failures in digest generation so that it will fail more robustly
  5644. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  5645. Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
  5646. - Report any failure in init_keys() calls launched because our
  5647. IP address has changed. Spotted by Coverity Scan. Bugfix on
  5648. 0.1.1.4-alpha; fixes CID 484.
  5649. o Minor bugfixes (log messages and documentation):
  5650. - Remove a confusing dollar sign from the example fingerprint in the
  5651. man page, and also make the example fingerprint a valid one. Fixes
  5652. bug 4309; bugfix on 0.2.1.3-alpha.
  5653. - The next version of Windows will be called Windows 8, and it has
  5654. a major version of 6, minor version of 2. Correctly identify that
  5655. version instead of calling it "Very recent version". Resolves
  5656. ticket 4153; reported by funkstar.
  5657. - Downgrade log messages about circuit timeout calibration from
  5658. "notice" to "info": they don't require or suggest any human
  5659. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  5660. bugfix on 0.2.2.14-alpha.
  5661. o Minor features:
  5662. - Turn on directory request statistics by default and include them in
  5663. extra-info descriptors. Don't break if we have no GeoIP database.
  5664. Backported from 0.2.3.1-alpha; implements ticket 3951.
  5665. - Update to the October 4 2011 Maxmind GeoLite Country database.
  5666. Changes in version 0.2.1.31 - 2011-10-26
  5667. Tor 0.2.1.31 backports important security and privacy fixes for
  5668. oldstable. This release is intended only for package maintainers and
  5669. others who cannot use the 0.2.2 stable series. All others should be
  5670. using Tor 0.2.2.x or newer.
  5671. o Security fixes (also included in 0.2.2.x):
  5672. - Replace all potentially sensitive memory comparison operations
  5673. with versions whose runtime does not depend on the data being
  5674. compared. This will help resist a class of attacks where an
  5675. adversary can use variations in timing information to learn
  5676. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  5677. implementation by Robert Ransom based partially on code by DJB.)
  5678. - Fix an assert in parsing router descriptors containing IPv6
  5679. addresses. This one took down the directory authorities when
  5680. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  5681. o Privacy/anonymity fixes (also included in 0.2.2.x):
  5682. - Clients and bridges no longer send TLS certificate chains on
  5683. outgoing OR connections. Previously, each client or bridge would
  5684. use the same cert chain for all outgoing OR connections until
  5685. its IP address changes, which allowed any relay that the client
  5686. or bridge contacted to determine which entry guards it is using.
  5687. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  5688. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  5689. no longer considers that connection as suitable for satisfying a
  5690. circuit EXTEND request. Now relays can protect clients from the
  5691. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  5692. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  5693. that they initiated. Relays could distinguish incoming bridge
  5694. connections from client connections, creating another avenue for
  5695. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  5696. Found by "frosty_un".
  5697. - When receiving a hidden service descriptor, check that it is for
  5698. the hidden service we wanted. Previously, Tor would store any
  5699. hidden service descriptors that a directory gave it, whether it
  5700. wanted them or not. This wouldn't have let an attacker impersonate
  5701. a hidden service, but it did let directories pre-seed a client
  5702. with descriptors that it didn't want. Bugfix on 0.0.6.
  5703. - Avoid linkability based on cached hidden service descriptors: forget
  5704. all hidden service descriptors cached as a client when processing a
  5705. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  5706. - Make the bridge directory authority refuse to answer directory
  5707. requests for "all" descriptors. It used to include bridge
  5708. descriptors in its answer, which was a major information leak.
  5709. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  5710. - Don't attach new streams to old rendezvous circuits after SIGNAL
  5711. NEWNYM. Previously, we would keep using an existing rendezvous
  5712. circuit if it remained open (i.e. if it were kept open by a
  5713. long-lived stream, or if a new stream were attached to it before
  5714. Tor could notice that it was old and no longer in use). Bugfix on
  5715. 0.1.1.15-rc; fixes bug 3375.
  5716. o Minor bugfixes (also included in 0.2.2.x):
  5717. - When we restart our relay, we might get a successful connection
  5718. from the outside before we've started our reachability tests,
  5719. triggering a warning: "ORPort found reachable, but I have no
  5720. routerinfo yet. Failing to inform controller of success." This
  5721. bug was harmless unless Tor is running under a controller
  5722. like Vidalia, in which case the controller would never get a
  5723. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  5724. fixes bug 1172.
  5725. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  5726. enabled. Fixes bug 1526.
  5727. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  5728. anything since 0.2.1.16-rc.
  5729. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  5730. None of the cases where we did this before were wrong, but by making
  5731. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  5732. - Fix a rare crash bug that could occur when a client was configured
  5733. with a large number of bridges. Fixes bug 2629; bugfix on
  5734. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  5735. - Correct the warning displayed when a rendezvous descriptor exceeds
  5736. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  5737. John Brooks.
  5738. - Fix an uncommon assertion failure when running with DNSPort under
  5739. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  5740. - When warning about missing zlib development packages during compile,
  5741. give the correct package names. Bugfix on 0.2.0.1-alpha.
  5742. - Require that introduction point keys and onion keys have public
  5743. exponent 65537. Bugfix on 0.2.0.10-alpha.
  5744. - Do not crash when our configuration file becomes unreadable, for
  5745. example due to a permissions change, between when we start up
  5746. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  5747. on 0.0.9pre6.
  5748. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  5749. Fixes bug 3208.
  5750. - Always NUL-terminate the sun_path field of a sockaddr_un before
  5751. passing it to the kernel. (Not a security issue: kernels are
  5752. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  5753. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  5754. - Don't stack-allocate the list of supplementary GIDs when we're
  5755. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  5756. could take up to 256K, which is way too much stack. Found by
  5757. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  5758. o Minor bugfixes (only in 0.2.1.x):
  5759. - Resume using micro-version numbers in 0.2.1.x: our Debian packages
  5760. rely on them. Bugfix on 0.2.1.30.
  5761. - Use git revisions instead of svn revisions when generating our
  5762. micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  5763. o Minor features (also included in 0.2.2.x):
  5764. - Adjust the expiration time on our SSL session certificates to
  5765. better match SSL certs seen in the wild. Resolves ticket 4014.
  5766. - Allow nameservers with IPv6 address. Resolves bug 2574.
  5767. - Update to the October 4 2011 Maxmind GeoLite Country database.
  5768. Changes in version 0.2.3.5-alpha - 2011-09-28
  5769. Tor 0.2.3.5-alpha fixes two bugs that make it possible to enumerate
  5770. bridge relays; fixes an assertion error that many users started hitting
  5771. today; and adds the ability to refill token buckets more often than
  5772. once per second, allowing significant performance improvements.
  5773. o Security fixes:
  5774. - Bridge relays now do their directory fetches inside Tor TLS
  5775. connections, like all the other clients do, rather than connecting
  5776. directly to the DirPort like public relays do. Removes another
  5777. avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
  5778. - Bridges relays now build circuits for themselves in a more similar
  5779. way to how clients build them. Removes another avenue for
  5780. enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
  5781. when bridges were introduced.
  5782. o Major bugfixes:
  5783. - Fix an "Assertion md->held_by_node == 1 failed" error that could
  5784. occur when the same microdescriptor was referenced by two node_t
  5785. objects at once. Fix for bug 4118; bugfix on Tor 0.2.3.1-alpha.
  5786. o Major features (networking):
  5787. - Add a new TokenBucketRefillInterval option to refill token buckets
  5788. more frequently than once per second. This should improve network
  5789. performance, alleviate queueing problems, and make traffic less
  5790. bursty. Implements proposal 183; closes ticket 3630. Design by
  5791. Florian Tschorsch and Björn Scheuermann; implementation by
  5792. Florian Tschorsch.
  5793. o Minor bugfixes:
  5794. - Change an integer overflow check in the OpenBSD_Malloc code so
  5795. that GCC is less likely to eliminate it as impossible. Patch
  5796. from Mansour Moufid. Fixes bug 4059.
  5797. o Minor bugfixes (usability):
  5798. - Downgrade log messages about circuit timeout calibration from
  5799. "notice" to "info": they don't require or suggest any human
  5800. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  5801. bugfix on 0.2.2.14-alpha.
  5802. o Minor features (diagnostics):
  5803. - When the system call to create a listener socket fails, log the
  5804. error message explaining why. This may help diagnose bug 4027.
  5805. Changes in version 0.2.3.4-alpha - 2011-09-13
  5806. Tor 0.2.3.4-alpha includes the fixes from 0.2.2.33, including a slight
  5807. tweak to Tor's TLS handshake that makes relays and bridges that run
  5808. this new version reachable from Iran again. It also fixes a few new
  5809. bugs in 0.2.3.x, and teaches relays to recognize when they're not
  5810. listed in the network consensus and republish.
  5811. o Major bugfixes (also part of 0.2.2.33):
  5812. - Avoid an assertion failure when reloading a configuration with
  5813. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  5814. 3923; bugfix on 0.2.2.25-alpha.
  5815. o Minor features (security, also part of 0.2.2.33):
  5816. - Check for replays of the public-key encrypted portion of an
  5817. INTRODUCE1 cell, in addition to the current check for replays of
  5818. the g^x value. This prevents a possible class of active attacks
  5819. by an attacker who controls both an introduction point and a
  5820. rendezvous point, and who uses the malleability of AES-CTR to
  5821. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  5822. that these attacks are infeasible (requiring the attacker to send
  5823. on the order of zettabytes of altered cells in a short interval),
  5824. but we'd rather block them off in case there are any classes of
  5825. this attack that we missed. Reported by Willem Pinckaers.
  5826. o Minor features (also part of 0.2.2.33):
  5827. - Adjust the expiration time on our SSL session certificates to
  5828. better match SSL certs seen in the wild. Resolves ticket 4014.
  5829. - Change the default required uptime for a relay to be accepted as
  5830. a HSDir (hidden service directory) from 24 hours to 25 hours.
  5831. Improves on 0.2.0.10-alpha; resolves ticket 2649.
  5832. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  5833. authorities to abstain from voting on assignment of the HSDir
  5834. consensus flag. Related to bug 2649.
  5835. - Update to the September 6 2011 Maxmind GeoLite Country database.
  5836. o Minor bugfixes (also part of 0.2.2.33):
  5837. - Demote the 'replay detected' log message emitted when a hidden
  5838. service receives the same Diffie-Hellman public key in two different
  5839. INTRODUCE2 cells to info level. A normal Tor client can cause that
  5840. log message during its normal operation. Bugfix on 0.2.1.6-alpha;
  5841. fixes part of bug 2442.
  5842. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  5843. level. There is nothing that a hidden service's operator can do
  5844. to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
  5845. of bug 2442.
  5846. - Clarify a log message specifying the characters permitted in
  5847. HiddenServiceAuthorizeClient client names. Previously, the log
  5848. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  5849. given the impression that every ASCII character between "+" and "_"
  5850. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
  5851. o Build fixes (also part of 0.2.2.33):
  5852. - Clean up some code issues that prevented Tor from building on older
  5853. BSDs. Fixes bug 3894; reported by "grarpamp".
  5854. - Search for a platform-specific version of "ar" when cross-compiling.
  5855. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  5856. o Major bugfixes:
  5857. - Fix a bug where the SocksPort option (for example) would get
  5858. ignored and replaced by the default if a SocksListenAddress
  5859. option was set. Bugfix on 0.2.3.3-alpha; fixes bug 3936. Fix by
  5860. Fabian Keil.
  5861. o Major features:
  5862. - Relays now try regenerating and uploading their descriptor more
  5863. frequently if they are not listed in the consensus, or if the
  5864. version of their descriptor listed in the consensus is too
  5865. old. This fix should prevent situations where a server declines
  5866. to re-publish itself because it has done so too recently, even
  5867. though the authorities decided not to list its recent-enough
  5868. descriptor. Fix for bug 3327.
  5869. o Minor features:
  5870. - Relays now include a reason for regenerating their descriptors
  5871. in an HTTP header when uploading to the authorities. This will
  5872. make it easier to debug descriptor-upload issues in the future.
  5873. - When starting as root and then changing our UID via the User
  5874. control option, and we have a ControlSocket configured, make sure
  5875. that the ControlSocket is owned by the same account that Tor will
  5876. run under. Implements ticket 3421; fix by Jérémy Bobbio.
  5877. o Minor bugfixes:
  5878. - Abort if tor_vasprintf fails in connection_printf_to_buf (a
  5879. utility function used in the control-port code). This shouldn't
  5880. ever happen unless Tor is completely out of memory, but if it did
  5881. happen and Tor somehow recovered from it, Tor could have sent a log
  5882. message to a control port in the middle of a reply to a controller
  5883. command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
  5884. - Make 'FetchUselessDescriptors' cause all descriptor types and
  5885. all consensus types (including microdescriptors) to get fetched.
  5886. Fixes bug 3851; bugfix on 0.2.3.1-alpha.
  5887. o Code refactoring:
  5888. - Make a new "entry connection" struct as an internal subtype of "edge
  5889. connection", to simplify the code and make exit connections smaller.
  5890. Changes in version 0.2.2.33 - 2011-09-13
  5891. Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
  5892. TLS handshake that makes relays and bridges that run this new version
  5893. reachable from Iran again.
  5894. o Major bugfixes:
  5895. - Avoid an assertion failure when reloading a configuration with
  5896. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  5897. 3923; bugfix on 0.2.2.25-alpha.
  5898. o Minor features (security):
  5899. - Check for replays of the public-key encrypted portion of an
  5900. INTRODUCE1 cell, in addition to the current check for replays of
  5901. the g^x value. This prevents a possible class of active attacks
  5902. by an attacker who controls both an introduction point and a
  5903. rendezvous point, and who uses the malleability of AES-CTR to
  5904. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  5905. that these attacks are infeasible (requiring the attacker to send
  5906. on the order of zettabytes of altered cells in a short interval),
  5907. but we'd rather block them off in case there are any classes of
  5908. this attack that we missed. Reported by Willem Pinckaers.
  5909. o Minor features:
  5910. - Adjust the expiration time on our SSL session certificates to
  5911. better match SSL certs seen in the wild. Resolves ticket 4014.
  5912. - Change the default required uptime for a relay to be accepted as
  5913. a HSDir (hidden service directory) from 24 hours to 25 hours.
  5914. Improves on 0.2.0.10-alpha; resolves ticket 2649.
  5915. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  5916. authorities to abstain from voting on assignment of the HSDir
  5917. consensus flag. Related to bug 2649.
  5918. - Update to the September 6 2011 Maxmind GeoLite Country database.
  5919. o Minor bugfixes (documentation and log messages):
  5920. - Correct the man page to explain that HashedControlPassword and
  5921. CookieAuthentication can both be set, in which case either method
  5922. is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
  5923. when we decided to allow these config options to both be set. Issue
  5924. raised by bug 3898.
  5925. - Demote the 'replay detected' log message emitted when a hidden
  5926. service receives the same Diffie-Hellman public key in two different
  5927. INTRODUCE2 cells to info level. A normal Tor client can cause that
  5928. log message during its normal operation. Bugfix on 0.2.1.6-alpha;
  5929. fixes part of bug 2442.
  5930. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  5931. level. There is nothing that a hidden service's operator can do
  5932. to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
  5933. of bug 2442.
  5934. - Clarify a log message specifying the characters permitted in
  5935. HiddenServiceAuthorizeClient client names. Previously, the log
  5936. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  5937. given the impression that every ASCII character between "+" and "_"
  5938. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
  5939. o Build fixes:
  5940. - Provide a substitute implementation of lround() for MSVC, which
  5941. apparently lacks it. Patch from Gisle Vanem.
  5942. - Clean up some code issues that prevented Tor from building on older
  5943. BSDs. Fixes bug 3894; reported by "grarpamp".
  5944. - Search for a platform-specific version of "ar" when cross-compiling.
  5945. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  5946. Changes in version 0.2.3.3-alpha - 2011-09-01
  5947. Tor 0.2.3.3-alpha adds a new "stream isolation" feature to improve Tor's
  5948. security, and provides client-side support for the microdescriptor
  5949. and optimistic data features introduced earlier in the 0.2.3.x
  5950. series. It also includes numerous critical bugfixes in the (optional)
  5951. bufferevent-based networking backend.
  5952. o Major features (stream isolation):
  5953. - You can now configure Tor so that streams from different
  5954. applications are isolated on different circuits, to prevent an
  5955. attacker who sees your streams as they leave an exit node from
  5956. linking your sessions to one another. To do this, choose some way
  5957. to distinguish the applications: have them connect to different
  5958. SocksPorts, or have one of them use SOCKS4 while the other uses
  5959. SOCKS5, or have them pass different authentication strings to the
  5960. SOCKS proxy. Then, use the new SocksPort syntax to configure the
  5961. degree of isolation you need. This implements Proposal 171.
  5962. - There's a new syntax for specifying multiple client ports (such as
  5963. SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
  5964. multiple *Port entries with full addr:port syntax on each.
  5965. The old *ListenAddress format is still supported, but you can't
  5966. mix it with the new *Port syntax.
  5967. o Major features (other):
  5968. - Enable microdescriptor fetching by default for clients. This allows
  5969. clients to download a much smaller amount of directory information.
  5970. To disable it (and go back to the old-style consensus and
  5971. descriptors), set "UseMicrodescriptors 0" in your torrc file.
  5972. - Tor's firewall-helper feature, introduced in 0.2.3.1-alpha (see the
  5973. "PortForwarding" config option), now supports Windows.
  5974. - When using an exit relay running 0.2.3.x, clients can now
  5975. "optimistically" send data before the exit relay reports that
  5976. the stream has opened. This saves a round trip when starting
  5977. connections where the client speaks first (such as web browsing).
  5978. This behavior is controlled by a consensus parameter (currently
  5979. disabled). To turn it on or off manually, use the "OptimisticData"
  5980. torrc option. Implements proposal 181; code by Ian Goldberg.
  5981. o Major bugfixes (bufferevents, fixes on 0.2.3.1-alpha):
  5982. - When using IOCP on Windows, we need to enable Libevent windows
  5983. threading support.
  5984. - The IOCP backend now works even when the user has not specified
  5985. the (internal, debugging-only) _UseFilteringSSLBufferevents option.
  5986. Fixes part of bug 3752.
  5987. - Correctly record the bytes we've read and written when using
  5988. bufferevents, so that we can include them in our bandwidth history
  5989. and advertised bandwidth. Fixes bug 3803.
  5990. - Apply rate-limiting only at the bottom of a chain of filtering
  5991. bufferevents. This prevents us from filling up internal read
  5992. buffers and violating rate-limits when filtering bufferevents
  5993. are enabled. Fixes part of bug 3804.
  5994. - Add high-watermarks to the output buffers for filtered
  5995. bufferevents. This prevents us from filling up internal write
  5996. buffers and wasting CPU cycles when filtering bufferevents are
  5997. enabled. Fixes part of bug 3804.
  5998. - Correctly notice when data has been written from a bufferevent
  5999. without flushing it completely. Fixes bug 3805.
  6000. - Fix a bug where server-side tunneled bufferevent-based directory
  6001. streams would get closed prematurely. Fixes bug 3814.
  6002. - Fix a use-after-free error with per-connection rate-limiting
  6003. buckets. Fixes bug 3888.
  6004. o Major bugfixes (also part of 0.2.2.31-rc):
  6005. - If we're configured to write our ControlPorts to disk, only write
  6006. them after switching UID and creating the data directory. This way,
  6007. we don't fail when starting up with a nonexistent DataDirectory
  6008. and a ControlPortWriteToFile setting based on that directory. Fixes
  6009. bug 3747; bugfix on Tor 0.2.2.26-beta.
  6010. o Minor features:
  6011. - Added a new CONF_CHANGED event so that controllers can be notified
  6012. of any configuration changes made by other controllers, or by the
  6013. user. Implements ticket 1692.
  6014. - Use evbuffer_copyout() in inspect_evbuffer(). This fixes a memory
  6015. leak when using bufferevents, and lets Libevent worry about how to
  6016. best copy data out of a buffer.
  6017. - Replace files in stats/ rather than appending to them. Now that we
  6018. include statistics in extra-info descriptors, it makes no sense to
  6019. keep old statistics forever. Implements ticket 2930.
  6020. o Minor features (build compatibility):
  6021. - Limited, experimental support for building with nmake and MSVC.
  6022. - Provide a substitute implementation of lround() for MSVC, which
  6023. apparently lacks it. Patch from Gisle Vanem.
  6024. o Minor features (also part of 0.2.2.31-rc):
  6025. - Update to the August 2 2011 Maxmind GeoLite Country database.
  6026. o Minor bugfixes (on 0.2.3.x-alpha):
  6027. - Fix a spurious warning when parsing SOCKS requests with
  6028. bufferevents enabled. Fixes bug 3615; bugfix on 0.2.3.2-alpha.
  6029. - Get rid of a harmless warning that could happen on relays running
  6030. with bufferevents. The warning was caused by someone doing an http
  6031. request to a relay's orport. Also don't warn for a few related
  6032. non-errors. Fixes bug 3700; bugfix on 0.2.3.1-alpha.
  6033. o Minor bugfixes (on 2.2.x and earlier):
  6034. - Correct the man page to explain that HashedControlPassword and
  6035. CookieAuthentication can both be set, in which case either method
  6036. is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
  6037. when we decided to allow these config options to both be set. Issue
  6038. raised by bug 3898.
  6039. - The "--quiet" and "--hush" options now apply not only to Tor's
  6040. behavior before logs are configured, but also to Tor's behavior in
  6041. the absense of configured logs. Fixes bug 3550; bugfix on
  6042. 0.2.0.10-alpha.
  6043. o Minor bugfixes (also part of 0.2.2.31-rc):
  6044. - Write several files in text mode, on OSes that distinguish text
  6045. mode from binary mode (namely, Windows). These files are:
  6046. 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
  6047. that collect those statistics; 'client_keys' and 'hostname' for
  6048. hidden services that use authentication; and (in the tor-gencert
  6049. utility) newly generated identity and signing keys. Previously,
  6050. we wouldn't specify text mode or binary mode, leading to an
  6051. assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
  6052. the DirRecordUsageByCountry option which would have triggered
  6053. the assertion failure was added), although this assertion failure
  6054. would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
  6055. - Selectively disable deprecation warnings on OS X because Lion
  6056. started deprecating the shipped copy of openssl. Fixes bug 3643.
  6057. - Remove an extra pair of quotation marks around the error
  6058. message in control-port STATUS_GENERAL BUG events. Bugfix on
  6059. 0.1.2.6-alpha; fixes bug 3732.
  6060. - When unable to format an address as a string, report its value
  6061. as "???" rather than reusing the last formatted address. Bugfix
  6062. on 0.2.1.5-alpha.
  6063. o Code simplifications and refactoring:
  6064. - Rewrite the listener-selection logic so that parsing which ports
  6065. we want to listen on is now separate from binding to the ports
  6066. we want.
  6067. o Build changes:
  6068. - Building Tor with bufferevent support now requires Libevent
  6069. 2.0.13-stable or later. Previous versions of Libevent had bugs in
  6070. SSL-related bufferevents and related issues that would make Tor
  6071. work badly with bufferevents. Requiring 2.0.13-stable also allows
  6072. Tor with bufferevents to take advantage of Libevent APIs
  6073. introduced after 2.0.8-rc.
  6074. Changes in version 0.2.2.32 - 2011-08-27
  6075. The Tor 0.2.2 release series is dedicated to the memory of Andreas
  6076. Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
  6077. a founder of the PETS community, a leader in our field, a mentor,
  6078. and a friend. He left us with these words: "I had the possibility
  6079. to contribute to this world that is not as it should be. I hope I
  6080. could help in some areas to make the world a better place, and that
  6081. I could also encourage other people to be engaged in improving the
  6082. world. Please, stay engaged. This world needs you, your love, your
  6083. initiative -- now I cannot be part of that anymore."
  6084. Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
  6085. ready. More than two years in the making, this release features improved
  6086. client performance and hidden service reliability, better compatibility
  6087. for Android, correct behavior for bridges that listen on more than
  6088. one address, more extensible and flexible directory object handling,
  6089. better reporting of network statistics, improved code security, and
  6090. many many other features and bugfixes.
  6091. Changes in version 0.2.2.31-rc - 2011-08-17
  6092. Tor 0.2.2.31-rc is the second and hopefully final release candidate
  6093. for the Tor 0.2.2.x series.
  6094. o Major bugfixes:
  6095. - Remove an extra pair of quotation marks around the error
  6096. message in control-port STATUS_GENERAL BUG events. Bugfix on
  6097. 0.1.2.6-alpha; fixes bug 3732.
  6098. - If we're configured to write our ControlPorts to disk, only write
  6099. them after switching UID and creating the data directory. This way,
  6100. we don't fail when starting up with a nonexistent DataDirectory
  6101. and a ControlPortWriteToFile setting based on that directory. Fixes
  6102. bug 3747; bugfix on Tor 0.2.2.26-beta.
  6103. o Minor features:
  6104. - Update to the August 2 2011 Maxmind GeoLite Country database.
  6105. o Minor bugfixes:
  6106. - Allow GETINFO fingerprint to return a fingerprint even when
  6107. we have not yet built a router descriptor. Fixes bug 3577;
  6108. bugfix on 0.2.0.1-alpha.
  6109. - Write several files in text mode, on OSes that distinguish text
  6110. mode from binary mode (namely, Windows). These files are:
  6111. 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
  6112. that collect those statistics; 'client_keys' and 'hostname' for
  6113. hidden services that use authentication; and (in the tor-gencert
  6114. utility) newly generated identity and signing keys. Previously,
  6115. we wouldn't specify text mode or binary mode, leading to an
  6116. assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
  6117. the DirRecordUsageByCountry option which would have triggered
  6118. the assertion failure was added), although this assertion failure
  6119. would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
  6120. - Selectively disable deprecation warnings on OS X because Lion
  6121. started deprecating the shipped copy of openssl. Fixes bug 3643.
  6122. - When unable to format an address as a string, report its value
  6123. as "???" rather than reusing the last formatted address. Bugfix
  6124. on 0.2.1.5-alpha.
  6125. Changes in version 0.2.3.2-alpha - 2011-07-18
  6126. Tor 0.2.3.2-alpha introduces two new experimental features:
  6127. microdescriptors and pluggable transports. It also continues cleaning
  6128. up a variety of recently introduced features.
  6129. o Major features:
  6130. - Clients can now use microdescriptors instead of regular descriptors
  6131. to build circuits. Microdescriptors are authority-generated
  6132. summaries of regular descriptors' contents, designed to change
  6133. very rarely (see proposal 158 for details). This feature is
  6134. designed to save bandwidth, especially for clients on slow internet
  6135. connections. It's off by default for now, since nearly no caches
  6136. support it, but it will be on-by-default for clients in a future
  6137. version. You can use the UseMicrodescriptors option to turn it on.
  6138. - Tor clients using bridges can now be configured to use a separate
  6139. 'transport' proxy for each bridge. This approach helps to resist
  6140. censorship by allowing bridges to use protocol obfuscation
  6141. plugins. It implements part of proposal 180. Implements ticket 2841.
  6142. - While we're trying to bootstrap, record how many TLS connections
  6143. fail in each state, and report which states saw the most failures
  6144. in response to any bootstrap failures. This feature may speed up
  6145. diagnosis of censorship events. Implements ticket 3116.
  6146. o Major bugfixes (on 0.2.3.1-alpha):
  6147. - When configuring a large set of nodes in EntryNodes (as with
  6148. 'EntryNodes {cc}' or 'EntryNodes 1.1.1.1/16'), choose only a
  6149. random subset to be guards, and choose them in random
  6150. order. Fixes bug 2798.
  6151. - Tor could crash when remembering a consensus in a non-used consensus
  6152. flavor without having a current consensus set. Fixes bug 3361.
  6153. - Comparing an unknown address to a microdescriptor's shortened exit
  6154. policy would always give a "rejected" result. Fixes bug 3599.
  6155. - Using microdescriptors as a client no longer prevents Tor from
  6156. uploading and downloading hidden service descriptors. Fixes
  6157. bug 3601.
  6158. o Minor features:
  6159. - Allow nameservers with IPv6 address. Resolves bug 2574.
  6160. - Accept attempts to include a password authenticator in the
  6161. handshake, as supported by SOCKS5. This handles SOCKS clients that
  6162. don't know how to omit a password when authenticating. Resolves
  6163. bug 1666.
  6164. - When configuring a large set of nodes in EntryNodes, and there are
  6165. enough of them listed as Guard so that we don't need to consider
  6166. the non-guard entries, prefer the ones listed with the Guard flag.
  6167. - Check for and recover from inconsistency in the microdescriptor
  6168. cache. This will make it harder for us to accidentally free a
  6169. microdescriptor without removing it from the appropriate data
  6170. structures. Fixes issue 3135; issue noted by "wanoskarnet".
  6171. - Log SSL state transitions at log level DEBUG, log domain
  6172. HANDSHAKE. This can be useful for debugging censorship events.
  6173. Implements ticket 3264.
  6174. - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
  6175. implements ticket 3439.
  6176. o Minor bugfixes (on 0.2.3.1-alpha):
  6177. - Do not free all general-purpose regular descriptors just
  6178. because microdescriptor use is enabled. Fixes bug 3113.
  6179. - Correctly link libevent_openssl when --enable-static-libevent
  6180. is passed to configure. Fixes bug 3118.
  6181. - Bridges should not complain during their heartbeat log messages that
  6182. they are unlisted in the consensus: that's more or less the point
  6183. of being a bridge. Fixes bug 3183.
  6184. - Report a SIGNAL event to controllers when acting on a delayed
  6185. SIGNAL NEWNYM command. Previously, we would report a SIGNAL
  6186. event to the controller if we acted on a SIGNAL NEWNYM command
  6187. immediately, and otherwise not report a SIGNAL event for the
  6188. command at all. Fixes bug 3349.
  6189. - Fix a crash when handling the SIGNAL controller command or
  6190. reporting ERR-level status events with bufferevents enabled. Found
  6191. by Robert Ransom. Fixes bug 3367.
  6192. - Always ship the tor-fw-helper manpage in our release tarballs.
  6193. Fixes bug 3389. Reported by Stephen Walker.
  6194. - Fix a class of double-mark-for-close bugs when bufferevents
  6195. are enabled. Fixes bug 3403.
  6196. - Update tor-fw-helper to support libnatpmp-20110618. Fixes bug 3434.
  6197. - Add SIGNAL to the list returned by the 'GETINFO events/names'
  6198. control-port command. Fixes part of bug 3465.
  6199. - Prevent using negative indices during unit test runs when read_all()
  6200. fails. Spotted by coverity.
  6201. - Fix a rare memory leak when checking the nodelist without it being
  6202. present. Found by coverity.
  6203. - Only try to download a microdescriptor-flavored consensus from
  6204. a directory cache that provides them.
  6205. o Minor bugfixes (on 0.2.2.x and earlier):
  6206. - Assert that hidden-service-related operations are not performed
  6207. using single-hop circuits. Previously, Tor would assert that
  6208. client-side streams are not attached to single-hop circuits,
  6209. but not that other sensitive operations on the client and service
  6210. side are not performed using single-hop circuits. Fixes bug 3332;
  6211. bugfix on 0.0.6.
  6212. - Don't publish a new relay descriptor when we reload our onion key,
  6213. unless the onion key has actually changed. Fixes bug 3263 and
  6214. resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
  6215. - Allow GETINFO fingerprint to return a fingerprint even when
  6216. we have not yet built a router descriptor. Fixes bug 3577;
  6217. bugfix on 0.2.0.1-alpha.
  6218. - Make 'tor --digests' list hashes of all Tor source files. Bugfix
  6219. on 0.2.2.4-alpha; fixes bug 3427.
  6220. o Code simplification and refactoring:
  6221. - Use tor_sscanf() in place of scanf() in more places through the
  6222. code. This makes us a little more locale-independent, and
  6223. should help shut up code-analysis tools that can't tell
  6224. a safe sscanf string from a dangerous one.
  6225. - Use tt_assert(), not tor_assert(), for checking for test failures.
  6226. This makes the unit tests more able to go on in the event that
  6227. one of them fails.
  6228. - Split connection_about_to_close() into separate functions for each
  6229. connection type.
  6230. o Build changes:
  6231. - On Windows, we now define the _WIN32_WINNT macros only if they
  6232. are not already defined. This lets the person building Tor decide,
  6233. if they want, to require a later version of Windows.
  6234. Changes in version 0.2.2.30-rc - 2011-07-07
  6235. Tor 0.2.2.30-rc is the first release candidate for the Tor 0.2.2.x
  6236. series. It fixes a few smaller bugs, but generally appears stable.
  6237. Please test it and let us know whether it is!
  6238. o Minor bugfixes:
  6239. - Send a SUCCEEDED stream event to the controller when a reverse
  6240. resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
  6241. discovered by katmagic.
  6242. - Always NUL-terminate the sun_path field of a sockaddr_un before
  6243. passing it to the kernel. (Not a security issue: kernels are
  6244. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  6245. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  6246. - Don't stack-allocate the list of supplementary GIDs when we're
  6247. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  6248. could take up to 256K, which is way too much stack. Found by
  6249. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  6250. - Add BUILDTIMEOUT_SET to the list returned by the 'GETINFO
  6251. events/names' control-port command. Bugfix on 0.2.2.9-alpha;
  6252. fixes part of bug 3465.
  6253. - Fix a memory leak when receiving a descriptor for a hidden
  6254. service we didn't ask for. Found by Coverity; CID #30. Bugfix
  6255. on 0.2.2.26-beta.
  6256. o Minor features:
  6257. - Update to the July 1 2011 Maxmind GeoLite Country database.
  6258. Changes in version 0.2.2.29-beta - 2011-06-20
  6259. Tor 0.2.2.29-beta reverts an accidental behavior change for users who
  6260. have bridge lines in their torrc but don't want to use them; gets
  6261. us closer to having the control socket feature working on Debian;
  6262. and fixes a variety of smaller bugs.
  6263. o Major bugfixes:
  6264. - Revert the UseBridges option to its behavior before 0.2.2.28-beta.
  6265. When we changed the default behavior to "use bridges if any
  6266. are listed in the torrc", we surprised users who had bridges
  6267. in their torrc files but who didn't actually want to use them.
  6268. Partial resolution for bug 3354.
  6269. o Privacy fixes:
  6270. - Don't attach new streams to old rendezvous circuits after SIGNAL
  6271. NEWNYM. Previously, we would keep using an existing rendezvous
  6272. circuit if it remained open (i.e. if it were kept open by a
  6273. long-lived stream, or if a new stream were attached to it before
  6274. Tor could notice that it was old and no longer in use). Bugfix on
  6275. 0.1.1.15-rc; fixes bug 3375.
  6276. o Minor bugfixes:
  6277. - Fix a bug when using ControlSocketsGroupWritable with User. The
  6278. directory's group would be checked against the current group, not
  6279. the configured group. Patch by Jérémy Bobbio. Fixes bug 3393;
  6280. bugfix on 0.2.2.26-beta.
  6281. - Make connection_printf_to_buf()'s behaviour sane. Its callers
  6282. expect it to emit a CRLF iff the format string ends with CRLF;
  6283. it actually emitted a CRLF iff (a) the format string ended with
  6284. CRLF or (b) the resulting string was over 1023 characters long or
  6285. (c) the format string did not end with CRLF *and* the resulting
  6286. string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
  6287. fixes part of bug 3407.
  6288. - Make send_control_event_impl()'s behaviour sane. Its callers
  6289. expect it to always emit a CRLF at the end of the string; it
  6290. might have emitted extra control characters as well. Bugfix on
  6291. 0.1.1.9-alpha; fixes another part of bug 3407.
  6292. - Make crypto_rand_int() check the value of its input correctly.
  6293. Previously, it accepted values up to UINT_MAX, but could return a
  6294. negative number if given a value above INT_MAX+1. Found by George
  6295. Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
  6296. - Avoid a segfault when reading a malformed circuit build state
  6297. with more than INT_MAX entries. Found by wanoskarnet. Bugfix on
  6298. 0.2.2.4-alpha.
  6299. - When asked about a DNS record type we don't support via a
  6300. client DNSPort, reply with NOTIMPL rather than an empty
  6301. reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
  6302. - Fix a rare memory leak during stats writing. Found by coverity.
  6303. o Minor features:
  6304. - Update to the June 1 2011 Maxmind GeoLite Country database.
  6305. o Code simplifications and refactoring:
  6306. - Remove some dead code as indicated by coverity.
  6307. - Remove a few dead assignments during router parsing. Found by
  6308. coverity.
  6309. - Add some forgotten return value checks during unit tests. Found
  6310. by coverity.
  6311. - Don't use 1-bit wide signed bit fields. Found by coverity.
  6312. Changes in version 0.2.2.28-beta - 2011-06-04
  6313. Tor 0.2.2.28-beta makes great progress towards a new stable release: we
  6314. fixed a big bug in whether relays stay in the consensus consistently,
  6315. we moved closer to handling bridges and hidden services correctly,
  6316. and we started the process of better handling the dreaded "my Vidalia
  6317. died, and now my Tor demands a password when I try to reconnect to it"
  6318. usability issue.
  6319. o Major bugfixes:
  6320. - Don't decide to make a new descriptor when receiving a HUP signal.
  6321. This bug has caused a lot of 0.2.2.x relays to disappear from the
  6322. consensus periodically. Fixes the most common case of triggering
  6323. bug 1810; bugfix on 0.2.2.7-alpha.
  6324. - Actually allow nameservers with IPv6 addresses. Fixes bug 2574.
  6325. - Don't try to build descriptors if "ORPort auto" is set and we
  6326. don't know our actual ORPort yet. Fix for bug 3216; bugfix on
  6327. 0.2.2.26-beta.
  6328. - Resolve a crash that occurred when setting BridgeRelay to 1 with
  6329. accounting enabled. Fixes bug 3228; bugfix on 0.2.2.18-alpha.
  6330. - Apply circuit timeouts to opened hidden-service-related circuits
  6331. based on the correct start time. Previously, we would apply the
  6332. circuit build timeout based on time since the circuit's creation;
  6333. it was supposed to be applied based on time since the circuit
  6334. entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
  6335. - Use the same circuit timeout for client-side introduction
  6336. circuits as for other four-hop circuits, rather than the timeout
  6337. for single-hop directory-fetch circuits; the shorter timeout may
  6338. have been appropriate with the static circuit build timeout in
  6339. 0.2.1.x and earlier, but caused many hidden service access attempts
  6340. to fail with the adaptive CBT introduced in 0.2.2.2-alpha. Bugfix
  6341. on 0.2.2.2-alpha; fixes another part of bug 1297.
  6342. - In ticket 2511 we fixed a case where you could use an unconfigured
  6343. bridge if you had configured it as a bridge the last time you ran
  6344. Tor. Now fix another edge case: if you had configured it as a bridge
  6345. but then switched to a different bridge via the controller, you
  6346. would still be willing to use the old one. Bugfix on 0.2.0.1-alpha;
  6347. fixes bug 3321.
  6348. o Major features:
  6349. - Add an __OwningControllerProcess configuration option and a
  6350. TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
  6351. that when it exits, Tor will shut down. Implements feature 3049.
  6352. - If "UseBridges 1" is set and no bridges are configured, Tor will
  6353. now refuse to build any circuits until some bridges are set.
  6354. If "UseBridges auto" is set, Tor will use bridges if they are
  6355. configured and we are not running as a server, but otherwise will
  6356. make circuits as usual. The new default is "auto". Patch by anonym,
  6357. so the Tails LiveCD can stop automatically revealing you as a Tor
  6358. user on startup.
  6359. o Minor bugfixes:
  6360. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  6361. - Remove a trailing asterisk from "exit-policy/default" in the
  6362. output of the control port command "GETINFO info/names". Bugfix
  6363. on 0.1.2.5-alpha.
  6364. - Use a wide type to hold sockets when built for 64-bit Windows builds.
  6365. Fixes bug 3270.
  6366. - Warn when the user configures two HiddenServiceDir lines that point
  6367. to the same directory. Bugfix on 0.0.6 (the version introducing
  6368. HiddenServiceDir); fixes bug 3289.
  6369. - Remove dead code from rend_cache_lookup_v2_desc_as_dir. Fixes
  6370. part of bug 2748; bugfix on 0.2.0.10-alpha.
  6371. - Log malformed requests for rendezvous descriptors as protocol
  6372. warnings, not warnings. Also, use a more informative log message
  6373. in case someone sees it at log level warning without prior
  6374. info-level messages. Fixes the other part of bug 2748; bugfix
  6375. on 0.2.0.10-alpha.
  6376. - Clear the table recording the time of the last request for each
  6377. hidden service descriptor from each HS directory on SIGNAL NEWNYM.
  6378. Previously, we would clear our HS descriptor cache on SIGNAL
  6379. NEWNYM, but if we had previously retrieved a descriptor (or tried
  6380. to) from every directory responsible for it, we would refuse to
  6381. fetch it again for up to 15 minutes. Bugfix on 0.2.2.25-alpha;
  6382. fixes bug 3309.
  6383. - Fix a log message that said "bits" while displaying a value in
  6384. bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
  6385. 0.2.0.1-alpha.
  6386. - When checking for 1024-bit keys, check for 1024 bits, not 128
  6387. bytes. This allows Tor to correctly discard keys of length 1017
  6388. through 1023. Bugfix on 0.0.9pre5.
  6389. o Minor features:
  6390. - Relays now log the reason for publishing a new relay descriptor,
  6391. so we have a better chance of hunting down instances of bug 1810.
  6392. Resolves ticket 3252.
  6393. - Revise most log messages that refer to nodes by nickname to
  6394. instead use the "$key=nickname at address" format. This should be
  6395. more useful, especially since nicknames are less and less likely
  6396. to be unique. Resolves ticket 3045.
  6397. - Log (at info level) when purging pieces of hidden-service-client
  6398. state because of SIGNAL NEWNYM.
  6399. o Removed options:
  6400. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  6401. anything since 0.2.1.16-rc.
  6402. Changes in version 0.2.2.27-beta - 2011-05-18
  6403. Tor 0.2.2.27-beta fixes a bridge-related stability bug in the previous
  6404. release, and also adds a few more general bugfixes.
  6405. o Major bugfixes:
  6406. - Fix a crash bug when changing bridges in a running Tor process.
  6407. Fixes bug 3213; bugfix on 0.2.2.26-beta.
  6408. - When the controller configures a new bridge, don't wait 10 to 60
  6409. seconds before trying to fetch its descriptor. Bugfix on
  6410. 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
  6411. o Minor bugfixes:
  6412. - Require that onion keys have exponent 65537 in microdescriptors too.
  6413. Fixes more of bug 3207; bugfix on 0.2.2.26-beta.
  6414. - Tor used to limit HttpProxyAuthenticator values to 48 characters.
  6415. Changed the limit to 512 characters by removing base64 newlines.
  6416. Fixes bug 2752. Fix by Michael Yakubovich.
  6417. - When a client starts or stops using bridges, never use a circuit
  6418. that was built before the configuration change. This behavior could
  6419. put at risk a user who uses bridges to ensure that her traffic
  6420. only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
  6421. bug 3200.
  6422. Changes in version 0.2.2.26-beta - 2011-05-17
  6423. Tor 0.2.2.26-beta fixes a variety of potential privacy problems. It
  6424. also introduces a new "socksport auto" approach that should make it
  6425. easier to run multiple Tors on the same system, and does a lot of
  6426. cleanup to get us closer to a release candidate.
  6427. o Security/privacy fixes:
  6428. - Replace all potentially sensitive memory comparison operations
  6429. with versions whose runtime does not depend on the data being
  6430. compared. This will help resist a class of attacks where an
  6431. adversary can use variations in timing information to learn
  6432. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  6433. implementation by Robert Ransom based partially on code by DJB.)
  6434. - When receiving a hidden service descriptor, check that it is for
  6435. the hidden service we wanted. Previously, Tor would store any
  6436. hidden service descriptors that a directory gave it, whether it
  6437. wanted them or not. This wouldn't have let an attacker impersonate
  6438. a hidden service, but it did let directories pre-seed a client
  6439. with descriptors that it didn't want. Bugfix on 0.0.6.
  6440. - On SIGHUP, do not clear out all TrackHostExits mappings, client
  6441. DNS cache entries, and virtual address mappings: that's what
  6442. NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
  6443. o Major features:
  6444. - The options SocksPort, ControlPort, and so on now all accept a
  6445. value "auto" that opens a socket on an OS-selected port. A
  6446. new ControlPortWriteToFile option tells Tor to write its
  6447. actual control port or ports to a chosen file. If the option
  6448. ControlPortFileGroupReadable is set, the file is created as
  6449. group-readable. Now users can run two Tor clients on the same
  6450. system without needing to manually mess with parameters. Resolves
  6451. part of ticket 3076.
  6452. - Set SO_REUSEADDR on all sockets, not just listeners. This should
  6453. help busy exit nodes avoid running out of useable ports just
  6454. because all the ports have been used in the near past. Resolves
  6455. issue 2850.
  6456. o Minor features:
  6457. - New "GETINFO net/listeners/(type)" controller command to return
  6458. a list of addresses and ports that are bound for listeners for a
  6459. given connection type. This is useful when the user has configured
  6460. "SocksPort auto" and the controller needs to know which port got
  6461. chosen. Resolves another part of ticket 3076.
  6462. - Add a new ControlSocketsGroupWritable configuration option: when
  6463. it is turned on, ControlSockets are group-writeable by the default
  6464. group of the current user. Patch by Jérémy Bobbio; implements
  6465. ticket 2972.
  6466. - Tor now refuses to create a ControlSocket in a directory that is
  6467. world-readable (or group-readable if ControlSocketsGroupWritable
  6468. is 0). This is necessary because some operating systems do not
  6469. enforce permissions on an AF_UNIX sockets. Permissions on the
  6470. directory holding the socket, however, seems to work everywhere.
  6471. - Rate-limit a warning about failures to download v2 networkstatus
  6472. documents. Resolves part of bug 1352.
  6473. - Backport code from 0.2.3.x that allows directory authorities to
  6474. clean their microdescriptor caches. Needed to resolve bug 2230.
  6475. - When an HTTPS proxy reports "403 Forbidden", we now explain
  6476. what it means rather than calling it an unexpected status code.
  6477. Closes bug 2503. Patch from Michael Yakubovich.
  6478. - Update to the May 1 2011 Maxmind GeoLite Country database.
  6479. o Minor bugfixes:
  6480. - Authorities now clean their microdesc cache periodically and when
  6481. reading from disk initially, not only when adding new descriptors.
  6482. This prevents a bug where we could lose microdescriptors. Bugfix
  6483. on 0.2.2.6-alpha. Fixes bug 2230.
  6484. - Do not crash when our configuration file becomes unreadable, for
  6485. example due to a permissions change, between when we start up
  6486. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  6487. on 0.0.9pre6.
  6488. - Avoid a bug that would keep us from replacing a microdescriptor
  6489. cache on Windows. (We would try to replace the file while still
  6490. holding it open. That's fine on Unix, but Windows doesn't let us
  6491. do that.) Bugfix on 0.2.2.6-alpha; bug found by wanoskarnet.
  6492. - Add missing explanations for the authority-related torrc options
  6493. RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey in the
  6494. man page. Resolves issue 2379.
  6495. - As an authority, do not upload our own vote or signature set to
  6496. ourself. It would tell us nothing new, and as of 0.2.2.24-alpha,
  6497. it would get flagged as a duplicate. Resolves bug 3026.
  6498. - Accept hidden service descriptors if we think we might be a hidden
  6499. service directory, regardless of what our consensus says. This
  6500. helps robustness, since clients and hidden services can sometimes
  6501. have a more up-to-date view of the network consensus than we do,
  6502. and if they think that the directory authorities list us a HSDir,
  6503. we might actually be one. Related to bug 2732; bugfix on
  6504. 0.2.0.10-alpha.
  6505. - When a controller changes TrackHostExits, remove mappings for
  6506. hosts that should no longer have their exits tracked. Bugfix on
  6507. 0.1.0.1-rc.
  6508. - When a controller changes VirtualAddrNetwork, remove any mappings
  6509. for hosts that were automapped to the old network. Bugfix on
  6510. 0.1.1.19-rc.
  6511. - When a controller changes one of the AutomapHosts* options, remove
  6512. any mappings for hosts that should no longer be automapped. Bugfix
  6513. on 0.2.0.1-alpha.
  6514. - Do not reset the bridge descriptor download status every time we
  6515. re-parse our configuration or get a configuration change. Fixes
  6516. bug 3019; bugfix on 0.2.0.3-alpha.
  6517. o Minor bugfixes (code cleanup):
  6518. - When loading the microdesc journal, remember its current size.
  6519. In 0.2.2, this helps prevent the microdesc journal from growing
  6520. without limit on authorities (who are the only ones to use it in
  6521. 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
  6522. Fix posted by "cypherpunks."
  6523. - The microdesc journal is supposed to get rebuilt only if it is
  6524. at least _half_ the length of the store, not _twice_ the length
  6525. of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
  6526. - Fix a potential null-pointer dereference while computing a
  6527. consensus. Bugfix on tor-0.2.0.3-alpha, found with the help of
  6528. clang's analyzer.
  6529. - Avoid a possible null-pointer dereference when rebuilding the mdesc
  6530. cache without actually having any descriptors to cache. Bugfix on
  6531. 0.2.2.6-alpha. Issue discovered using clang's static analyzer.
  6532. - If we fail to compute the identity digest of a v3 legacy keypair,
  6533. warn, and don't use a buffer-full of junk instead. Bugfix on
  6534. 0.2.1.1-alpha; fixes bug 3106.
  6535. - Resolve an untriggerable issue in smartlist_string_num_isin(),
  6536. where if the function had ever in the future been used to check
  6537. for the presence of a too-large number, it would have given an
  6538. incorrect result. (Fortunately, we only used it for 16-bit
  6539. values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
  6540. - Require that introduction point keys and onion handshake keys
  6541. have a public exponent of 65537. Starts to fix bug 3207; bugfix
  6542. on 0.2.0.10-alpha.
  6543. o Removed features:
  6544. - Caches no longer download and serve v2 networkstatus documents
  6545. unless FetchV2Networkstatus flag is set: these documents haven't
  6546. haven't been used by clients or relays since 0.2.0.x. Resolves
  6547. bug 3022.
  6548. Changes in version 0.2.3.1-alpha - 2011-05-05
  6549. Tor 0.2.3.1-alpha adds some new experimental features, including support
  6550. for an improved network IO backend, IOCP networking on Windows,
  6551. microdescriptor caching, "fast-start" support for streams, and automatic
  6552. home router configuration. There are also numerous internal improvements
  6553. to try to make the code easier for developers to work with.
  6554. This is the first alpha release in a new series, so expect there to be
  6555. bugs. Users who would rather test out a more stable branch should
  6556. stay with 0.2.2.x for now.
  6557. o Major features:
  6558. - Tor can now optionally build with the "bufferevents" buffered IO
  6559. backend provided by Libevent 2. To use this feature, make sure you
  6560. have the latest possible version of Libevent, and pass the
  6561. --enable-bufferevents flag to configure when building Tor from
  6562. source. This feature will make our networking code more flexible,
  6563. let us stack layers on each other, and let us use more efficient
  6564. zero-copy transports where available.
  6565. - As an experimental feature, Tor can use IOCP for networking on Windows.
  6566. Once this code is tuned and optimized, it promises much better
  6567. performance than the select-based backend we've used in the past. To
  6568. try this feature, you must build Tor with Libevent 2, configure Tor
  6569. with the "bufferevents" buffered IO backend, and add "DisableIOCP 0" to
  6570. your torrc. There are known bugs here: only try this if you can help
  6571. debug it as it breaks.
  6572. - The EntryNodes option can now include country codes like {de} or IP
  6573. addresses or network masks. Previously we had disallowed these options
  6574. because we didn't have an efficient way to keep the list up to
  6575. date. Fixes bug 1982, but see bug 2798 for an unresolved issue here.
  6576. - Exit nodes now accept and queue data on not-yet-connected streams.
  6577. Previously, the client wasn't allowed to send data until the stream was
  6578. connected, which slowed down all connections. This change will enable
  6579. clients to perform a "fast-start" on streams and send data without
  6580. having to wait for a confirmation that the stream has opened. (Patch
  6581. from Ian Goldberg; implements the server side of Proposal 174.)
  6582. - Tor now has initial support for automatic port mapping on the many
  6583. home routers that support NAT-PMP or UPnP. (Not yet supported on
  6584. Windows). To build the support code, you'll need to have libnatpnp
  6585. library and/or the libminiupnpc library, and you'll need to enable the
  6586. feature specifically by passing "--enable-upnp" and/or
  6587. "--enable-natpnp" to configure. To turn it on, use the new
  6588. PortForwarding option.
  6589. - Caches now download, cache, and serve multiple "flavors" of the
  6590. consensus, including a flavor that describes microdescriptors.
  6591. - Caches now download, cache, and serve microdescriptors -- small
  6592. summaries of router descriptors that are authenticated by all of the
  6593. directory authorities. Once enough caches are running this code,
  6594. clients will be able to save significant amounts of directory bandwidth
  6595. by downloading microdescriptors instead of router descriptors.
  6596. o Minor features:
  6597. - Make logging resolution configurable with a new LogTimeGranularity
  6598. option, and change the default from 1 millisecond to 1 second.
  6599. Implements enhancement 1668.
  6600. - We log which torrc file we're using on startup. Implements ticket
  6601. 2444.
  6602. - Ordinarily, Tor does not count traffic from private addresses (like
  6603. 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
  6604. There is now a new option, CountPrivateBandwidth, to disable this
  6605. behavior. Patch from Daniel Cagara.
  6606. - New --enable-static-tor configure option for building Tor as
  6607. statically as possible. Idea, general hackery and thoughts from
  6608. Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
  6609. 2702.
  6610. - If you set the NumCPUs option to 0, Tor will now try to detect how
  6611. many CPUs you have. This is the new default behavior.
  6612. - Turn on directory request statistics by default and include them in
  6613. extra-info descriptors. Don't break if we have no GeoIP database.
  6614. - Relays that set "ConnDirectionStatistics 1" write statistics on the
  6615. bidirectional use of connections to disk every 24 hours.
  6616. - Add a GeoIP file digest to the extra-info descriptor. Implements
  6617. enhancement 1883.
  6618. - The NodeFamily option -- which let you declare that you want to
  6619. consider nodes to be part of a family whether they list themselves
  6620. that way or not -- now allows IP address ranges and country codes.
  6621. - Add a new 'Heartbeat' log message type to periodically log a message
  6622. describing Tor's status at level Notice. This feature is meant for
  6623. operators who log at notice, and want to make sure that their Tor
  6624. server is still working. Implementation by George Kadianakis.
  6625. o Minor bugfixes (on 0.2.2.25-alpha):
  6626. - When loading the microdesc journal, remember its current size.
  6627. In 0.2.2, this helps prevent the microdesc journal from growing
  6628. without limit on authorities (who are the only ones to use it in
  6629. 0.2.2). Fixes a part of bug 2230; bugfix on 0.2.2.6-alpha.
  6630. Fix posted by "cypherpunks."
  6631. - The microdesc journal is supposed to get rebuilt only if it is
  6632. at least _half_ the length of the store, not _twice_ the length
  6633. of the store. Bugfix on 0.2.2.6-alpha; fixes part of bug 2230.
  6634. - If as an authority we fail to compute the identity digest of a v3
  6635. legacy keypair, warn, and don't use a buffer-full of junk instead.
  6636. Bugfix on 0.2.1.1-alpha; fixes bug 3106.
  6637. - Authorities now clean their microdesc cache periodically and when
  6638. reading from disk initially, not only when adding new descriptors.
  6639. This prevents a bug where we could lose microdescriptors. Bugfix
  6640. on 0.2.2.6-alpha.
  6641. o Minor features (controller):
  6642. - Add a new SIGNAL event to the controller interface so that
  6643. controllers can be notified when Tor handles a signal. Resolves
  6644. issue 1955. Patch by John Brooks.
  6645. - Add a new GETINFO option to get total bytes read and written. Patch
  6646. from pipe, revised by atagar. Resolves ticket 2345.
  6647. - Implement some GETINFO controller fields to provide information about
  6648. the Tor process's pid, euid, username, and resource limits.
  6649. o Build changes:
  6650. - Our build system requires automake 1.6 or later to create the
  6651. Makefile.in files. Previously, you could have used 1.4.
  6652. This only affects developers and people building Tor from git;
  6653. people who build Tor from the source distribution without changing
  6654. the Makefile.am files should be fine.
  6655. - Our autogen.sh script uses autoreconf to launch autoconf, automake, and
  6656. so on. This is more robust against some of the failure modes
  6657. associated with running the autotools pieces on their own.
  6658. o Minor packaging issues:
  6659. - On OpenSUSE, create the /var/run/tor directory on startup if it is not
  6660. already created. Patch from Andreas Stieger. Fixes bug 2573.
  6661. o Code simplifications and refactoring:
  6662. - A major revision to our internal node-selecting and listing logic.
  6663. Tor already had at least two major ways to look at the question of
  6664. "which Tor servers do we know about": a list of router descriptors,
  6665. and a list of entries in the current consensus. With
  6666. microdescriptors, we're adding a third. Having so many systems
  6667. without an abstraction layer over them was hurting the codebase.
  6668. Now, we have a new "node_t" abstraction that presents a consistent
  6669. interface to a client's view of a Tor node, and holds (nearly) all
  6670. of the mutable state formerly in routerinfo_t and routerstatus_t.
  6671. - The helper programs tor-gencert, tor-resolve, and tor-checkkey
  6672. no longer link against Libevent: they never used it, but
  6673. our library structure used to force them to link it.
  6674. o Removed features:
  6675. - Remove some old code to work around even older versions of Tor that
  6676. used forked processes to handle DNS requests. Such versions of Tor
  6677. are no longer in use as servers.
  6678. o Documentation fixes:
  6679. - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
  6680. - Add missing documentation for the authority-related torrc options
  6681. RephistTrackTime, BridgePassword, and V3AuthUseLegacyKey. Resolves
  6682. issue 2379.
  6683. Changes in version 0.2.2.25-alpha - 2011-04-29
  6684. Tor 0.2.2.25-alpha fixes many bugs: hidden service clients are more
  6685. robust, routers no longer overreport their bandwidth, Win7 should crash
  6686. a little less, and NEWNYM (as used by Vidalia's "new identity" button)
  6687. now prevents hidden service-related activity from being linkable. It
  6688. provides more information to Vidalia so you can see if your bridge is
  6689. working. Also, 0.2.2.25-alpha revamps the Entry/Exit/ExcludeNodes and
  6690. StrictNodes configuration options to make them more reliable, more
  6691. understandable, and more regularly applied. If you use those options,
  6692. please see the revised documentation for them in the manual page.
  6693. o Major bugfixes:
  6694. - Relays were publishing grossly inflated bandwidth values because
  6695. they were writing their state files wrong--now they write the
  6696. correct value. Also, resume reading bandwidth history from the
  6697. state file correctly. Fixes bug 2704; bugfix on 0.2.2.23-alpha.
  6698. - Improve hidden service robustness: When we find that we have
  6699. extended a hidden service's introduction circuit to a relay not
  6700. listed as an introduction point in the HS descriptor we currently
  6701. have, retry with an introduction point from the current
  6702. descriptor. Previously we would just give up. Fixes bugs 1024 and
  6703. 1930; bugfix on 0.2.0.10-alpha.
  6704. - Clients now stop trying to use an exit node associated with a given
  6705. destination by TrackHostExits if they fail to reach that exit node.
  6706. Fixes bug 2999. Bugfix on 0.2.0.20-rc.
  6707. - Fix crash bug on platforms where gmtime and localtime can return
  6708. NULL. Windows 7 users were running into this one. Fixes part of bug
  6709. 2077. Bugfix on all versions of Tor. Found by boboper.
  6710. o Security and stability fixes:
  6711. - Don't double-free a parsable, but invalid, microdescriptor, even if
  6712. it is followed in the blob we're parsing by an unparsable
  6713. microdescriptor. Fixes an issue reported in a comment on bug 2954.
  6714. Bugfix on 0.2.2.6-alpha; fix by "cypherpunks".
  6715. - If the Nickname configuration option isn't given, Tor would pick a
  6716. nickname based on the local hostname as the nickname for a relay.
  6717. Because nicknames are not very important in today's Tor and the
  6718. "Unnamed" nickname has been implemented, this is now problematic
  6719. behavior: It leaks information about the hostname without being
  6720. useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
  6721. introduced the Unnamed nickname. Reported by tagnaq.
  6722. - Fix an uncommon assertion failure when running with DNSPort under
  6723. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  6724. - Avoid linkability based on cached hidden service descriptors: forget
  6725. all hidden service descriptors cached as a client when processing a
  6726. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  6727. o Major features:
  6728. - Export GeoIP information on bridge usage to controllers even if we
  6729. have not yet been running for 24 hours. Now Vidalia bridge operators
  6730. can get more accurate and immediate feedback about their
  6731. contributions to the network.
  6732. o Major features and bugfixes (node selection):
  6733. - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
  6734. ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and StrictNodes
  6735. options. Previously, we had been ambiguous in describing what
  6736. counted as an "exit" node, and what operations exactly "StrictNodes
  6737. 0" would permit. This created confusion when people saw nodes built
  6738. through unexpected circuits, and made it hard to tell real bugs from
  6739. surprises. Now the intended behavior is:
  6740. . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
  6741. a node that delivers user traffic outside the Tor network.
  6742. . "Entry", in the context of EntryNodes, means a node used as the
  6743. first hop of a multihop circuit. It doesn't include direct
  6744. connections to directory servers.
  6745. . "ExcludeNodes" applies to all nodes.
  6746. . "StrictNodes" changes the behavior of ExcludeNodes only. When
  6747. StrictNodes is set, Tor should avoid all nodes listed in
  6748. ExcludeNodes, even when it will make user requests fail. When
  6749. StrictNodes is *not* set, then Tor should follow ExcludeNodes
  6750. whenever it can, except when it must use an excluded node to
  6751. perform self-tests, connect to a hidden service, provide a
  6752. hidden service, fulfill a .exit request, upload directory
  6753. information, or fetch directory information.
  6754. Collectively, the changes to implement the behavior fix bug 1090.
  6755. - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
  6756. a node is listed in both, it's treated as excluded.
  6757. - ExcludeNodes now applies to directory nodes -- as a preference if
  6758. StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
  6759. Don't exclude all the directory authorities and set StrictNodes to 1
  6760. unless you really want your Tor to break.
  6761. - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
  6762. - ExcludeExitNodes now overrides .exit requests.
  6763. - We don't use bridges listed in ExcludeNodes.
  6764. - When StrictNodes is 1:
  6765. . We now apply ExcludeNodes to hidden service introduction points
  6766. and to rendezvous points selected by hidden service users. This
  6767. can make your hidden service less reliable: use it with caution!
  6768. . If we have used ExcludeNodes on ourself, do not try relay
  6769. reachability self-tests.
  6770. . If we have excluded all the directory authorities, we will not
  6771. even try to upload our descriptor if we're a relay.
  6772. . Do not honor .exit requests to an excluded node.
  6773. - Remove a misfeature that caused us to ignore the Fast/Stable flags
  6774. when ExitNodes is set. Bugfix on 0.2.2.7-alpha.
  6775. - When the set of permitted nodes changes, we now remove any mappings
  6776. introduced via TrackExitHosts to now-excluded nodes. Bugfix on
  6777. 0.1.0.1-rc.
  6778. - We never cannibalize a circuit that had excluded nodes on it, even
  6779. if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
  6780. - Revert a change where we would be laxer about attaching streams to
  6781. circuits than when building the circuits. This was meant to prevent
  6782. a set of bugs where streams were never attachable, but our improved
  6783. code here should make this unnecessary. Bugfix on 0.2.2.7-alpha.
  6784. - Keep track of how many times we launch a new circuit to handle a
  6785. given stream. Too many launches could indicate an inconsistency
  6786. between our "launch a circuit to handle this stream" logic and our
  6787. "attach this stream to one of the available circuits" logic.
  6788. - Improve log messages related to excluded nodes.
  6789. o Minor bugfixes:
  6790. - Fix a spurious warning when moving from a short month to a long
  6791. month on relays with month-based BandwidthAccounting. Bugfix on
  6792. 0.2.2.17-alpha; fixes bug 3020.
  6793. - When a client finds that an origin circuit has run out of 16-bit
  6794. stream IDs, we now mark it as unusable for new streams. Previously,
  6795. we would try to close the entire circuit. Bugfix on 0.0.6.
  6796. - Add a forgotten cast that caused a compile warning on OS X 10.6.
  6797. Bugfix on 0.2.2.24-alpha.
  6798. - Be more careful about reporting the correct error from a failed
  6799. connect() system call. Under some circumstances, it was possible to
  6800. look at an incorrect value for errno when sending the end reason.
  6801. Bugfix on 0.1.0.1-rc.
  6802. - Correctly handle an "impossible" overflow cases in connection byte
  6803. counting, where we write or read more than 4GB on an edge connection
  6804. in a single second. Bugfix on 0.1.2.8-beta.
  6805. - Correct the warning displayed when a rendezvous descriptor exceeds
  6806. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  6807. John Brooks.
  6808. - Clients and hidden services now use HSDir-flagged relays for hidden
  6809. service descriptor downloads and uploads even if the relays have no
  6810. DirPort set and the client has disabled TunnelDirConns. This will
  6811. eventually allow us to give the HSDir flag to relays with no
  6812. DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
  6813. - Downgrade "no current certificates known for authority" message from
  6814. Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
  6815. - Make the SIGNAL DUMP control-port command work on FreeBSD. Fixes bug
  6816. 2917. Bugfix on 0.1.1.1-alpha.
  6817. - Only limit the lengths of single HS descriptors, even when multiple
  6818. HS descriptors are published to an HSDir relay in a single POST
  6819. operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
  6820. - Write the current time into the LastWritten line in our state file,
  6821. rather than the time from the previous write attempt. Also, stop
  6822. trying to use a time of -1 in our log statements. Fixes bug 3039;
  6823. bugfix on 0.2.2.14-alpha.
  6824. - Be more consistent in our treatment of file system paths. "~" should
  6825. get expanded to the user's home directory in the Log config option.
  6826. Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
  6827. feature for the -f and --DataDirectory options.
  6828. o Minor features:
  6829. - Make sure every relay writes a state file at least every 12 hours.
  6830. Previously, a relay could go for weeks without writing its state
  6831. file, and on a crash could lose its bandwidth history, capacity
  6832. estimates, client country statistics, and so on. Addresses bug 3012.
  6833. - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
  6834. Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
  6835. clients are already deprecated because of security bugs.
  6836. - Don't allow v0 hidden service authorities to act as clients.
  6837. Required by fix for bug 3000.
  6838. - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
  6839. by fix for bug 3000.
  6840. - Ensure that no empty [dirreq-](read|write)-history lines are added
  6841. to an extrainfo document. Implements ticket 2497.
  6842. o Code simplification and refactoring:
  6843. - Remove workaround code to handle directory responses from servers
  6844. that had bug 539 (they would send HTTP status 503 responses _and_
  6845. send a body too). Since only server versions before
  6846. 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
  6847. keep the workaround in place.
  6848. - Remove the old 'fuzzy time' logic. It was supposed to be used for
  6849. handling calculations where we have a known amount of clock skew and
  6850. an allowed amount of unknown skew. But we only used it in three
  6851. places, and we never adjusted the known/unknown skew values. This is
  6852. still something we might want to do someday, but if we do, we'll
  6853. want to do it differently.
  6854. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  6855. None of the cases where we did this before were wrong, but by making
  6856. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  6857. - Use GetTempDir to find the proper temporary directory location on
  6858. Windows when generating temporary files for the unit tests. Patch by
  6859. Gisle Vanem.
  6860. Changes in version 0.2.2.24-alpha - 2011-04-08
  6861. Tor 0.2.2.24-alpha fixes a variety of bugs, including a big bug that
  6862. prevented Tor clients from effectively using "multihomed" bridges,
  6863. that is, bridges that listen on multiple ports or IP addresses so users
  6864. can continue to use some of their addresses even if others get blocked.
  6865. o Major bugfixes:
  6866. - Fix a bug where bridge users who configure the non-canonical
  6867. address of a bridge automatically switch to its canonical
  6868. address. If a bridge listens at more than one address, it should be
  6869. able to advertise those addresses independently and any non-blocked
  6870. addresses should continue to work. Bugfix on Tor 0.2.0.x. Fixes
  6871. bug 2510.
  6872. - If you configured Tor to use bridge A, and then quit and
  6873. configured Tor to use bridge B instead, it would happily continue
  6874. to use bridge A if it's still reachable. While this behavior is
  6875. a feature if your goal is connectivity, in some scenarios it's a
  6876. dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
  6877. - Directory authorities now use data collected from their own
  6878. uptime observations when choosing whether to assign the HSDir flag
  6879. to relays, instead of trusting the uptime value the relay reports in
  6880. its descriptor. This change helps prevent an attack where a small
  6881. set of nodes with frequently-changing identity keys can blackhole
  6882. a hidden service. (Only authorities need upgrade; others will be
  6883. fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
  6884. o Minor bugfixes:
  6885. - When we restart our relay, we might get a successful connection
  6886. from the outside before we've started our reachability tests,
  6887. triggering a warning: "ORPort found reachable, but I have no
  6888. routerinfo yet. Failing to inform controller of success." This
  6889. bug was harmless unless Tor is running under a controller
  6890. like Vidalia, in which case the controller would never get a
  6891. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  6892. fixes bug 1172.
  6893. - Make directory authorities more accurate at recording when
  6894. relays that have failed several reachability tests became
  6895. unreachable, so we can provide more accuracy at assigning Stable,
  6896. Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
  6897. - Fix an issue that prevented static linking of libevent on
  6898. some platforms (notably Linux). Fixes bug 2698; bugfix on
  6899. versions 0.2.1.23/0.2.2.8-alpha (the versions introducing
  6900. the --with-static-libevent configure option).
  6901. - We now ask the other side of a stream (the client or the exit)
  6902. for more data on that stream when the amount of queued data on
  6903. that stream dips low enough. Previously, we wouldn't ask the
  6904. other side for more data until either it sent us more data (which
  6905. it wasn't supposed to do if it had exhausted its window!) or we
  6906. had completely flushed all our queued data. This flow control fix
  6907. should improve throughput. Fixes bug 2756; bugfix on the earliest
  6908. released versions of Tor (svn commit r152).
  6909. - Avoid a double-mark-for-free warning when failing to attach a
  6910. transparent proxy connection. (We thought we had fixed this in
  6911. 0.2.2.23-alpha, but it turns out our fix was checking the wrong
  6912. connection.) Fixes bug 2757; bugfix on 0.1.2.1-alpha (the original
  6913. bug) and 0.2.2.23-alpha (the incorrect fix).
  6914. - When warning about missing zlib development packages during compile,
  6915. give the correct package names. Bugfix on 0.2.0.1-alpha.
  6916. o Minor features:
  6917. - Directory authorities now log the source of a rejected POSTed v3
  6918. networkstatus vote.
  6919. - Make compilation with clang possible when using
  6920. --enable-gcc-warnings by removing two warning options that clang
  6921. hasn't implemented yet and by fixing a few warnings. Implements
  6922. ticket 2696.
  6923. - When expiring circuits, use microsecond timers rather than
  6924. one-second timers. This can avoid an unpleasant situation where a
  6925. circuit is launched near the end of one second and expired right
  6926. near the beginning of the next, and prevent fluctuations in circuit
  6927. timeout values.
  6928. - Use computed circuit-build timeouts to decide when to launch
  6929. parallel introduction circuits for hidden services. (Previously,
  6930. we would retry after 15 seconds.)
  6931. - Update to the April 1 2011 Maxmind GeoLite Country database.
  6932. o Packaging fixes:
  6933. - Create the /var/run/tor directory on startup on OpenSUSE if it is
  6934. not already created. Patch from Andreas Stieger. Fixes bug 2573.
  6935. o Documentation changes:
  6936. - Modernize the doxygen configuration file slightly. Fixes bug 2707.
  6937. - Resolve all doxygen warnings except those for missing documentation.
  6938. Fixes bug 2705.
  6939. - Add doxygen documentation for more functions, fields, and types.
  6940. Changes in version 0.2.2.23-alpha - 2011-03-08
  6941. Tor 0.2.2.23-alpha lets relays record their bandwidth history so when
  6942. they restart they don't lose their bandwidth capacity estimate. This
  6943. release also fixes a diverse set of user-facing bugs, ranging from
  6944. relays overrunning their rate limiting to clients falsely warning about
  6945. clock skew to bridge descriptor leaks by our bridge directory authority.
  6946. o Major bugfixes:
  6947. - Stop sending a CLOCK_SKEW controller status event whenever
  6948. we fetch directory information from a relay that has a wrong clock.
  6949. Instead, only inform the controller when it's a trusted authority
  6950. that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
  6951. the rest of bug 1074.
  6952. - Fix an assert in parsing router descriptors containing IPv6
  6953. addresses. This one took down the directory authorities when
  6954. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  6955. - Make the bridge directory authority refuse to answer directory
  6956. requests for "all" descriptors. It used to include bridge
  6957. descriptors in its answer, which was a major information leak.
  6958. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  6959. - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
  6960. Tor would ignore their RelayBandwidthBurst setting,
  6961. potentially using more bandwidth than expected. Bugfix on
  6962. 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
  6963. - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
  6964. hidserv" in her torrc. The 'hidserv' argument never controlled
  6965. publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
  6966. o Major features:
  6967. - Relays now save observed peak bandwidth throughput rates to their
  6968. state file (along with total usage, which was already saved)
  6969. so that they can determine their correct estimated bandwidth on
  6970. restart. Resolves bug 1863, where Tor relays would reset their
  6971. estimated bandwidth to 0 after restarting.
  6972. - Directory authorities now take changes in router IP address and
  6973. ORPort into account when determining router stability. Previously,
  6974. if a router changed its IP or ORPort, the authorities would not
  6975. treat it as having any downtime for the purposes of stability
  6976. calculation, whereas clients would experience downtime since the
  6977. change could take a while to propagate to them. Resolves issue 1035.
  6978. - Enable Address Space Layout Randomization (ASLR) and Data Execution
  6979. Prevention (DEP) by default on Windows to make it harder for
  6980. attackers to exploit vulnerabilities. Patch from John Brooks.
  6981. o Minor bugfixes (on 0.2.1.x and earlier):
  6982. - Fix a rare crash bug that could occur when a client was configured
  6983. with a large number of bridges. Fixes bug 2629; bugfix on
  6984. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  6985. - Avoid a double mark-for-free warning when failing to attach a
  6986. transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
  6987. bug 2279.
  6988. - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
  6989. found by "cypherpunks". This bug was introduced before the first
  6990. Tor release, in svn commit r110.
  6991. - Country codes aren't supported in EntryNodes until 0.2.3.x, so
  6992. don't mention them in the manpage. Fixes bug 2450; issue
  6993. spotted by keb and G-Lo.
  6994. - Fix a bug in bandwidth history state parsing that could have been
  6995. triggered if a future version of Tor ever changed the timing
  6996. granularity at which bandwidth history is measured. Bugfix on
  6997. Tor 0.1.1.11-alpha.
  6998. - When a relay decides that its DNS is too broken for it to serve
  6999. as an exit server, it advertised itself as a non-exit, but
  7000. continued to act as an exit. This could create accidental
  7001. partitioning opportunities for users. Instead, if a relay is
  7002. going to advertise reject *:* as its exit policy, it should
  7003. really act with exit policy "reject *:*". Fixes bug 2366.
  7004. Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
  7005. - In the special case where you configure a public exit relay as your
  7006. bridge, Tor would be willing to use that exit relay as the last
  7007. hop in your circuit as well. Now we fail that circuit instead.
  7008. Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
  7009. - Fix a bug with our locking implementation on Windows that couldn't
  7010. correctly detect when a file was already locked. Fixes bug 2504,
  7011. bugfix on 0.2.1.6-alpha.
  7012. - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
  7013. Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
  7014. "piebeer".
  7015. - Set target port in get_interface_address6() correctly. Bugfix
  7016. on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
  7017. - Directory authorities are now more robust to hops back in time
  7018. when calculating router stability. Previously, if a run of uptime
  7019. or downtime appeared to be negative, the calculation could give
  7020. incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
  7021. bug 1035.
  7022. - Fix an assert that got triggered when using the TestingTorNetwork
  7023. configuration option and then issuing a GETINFO config-text control
  7024. command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
  7025. o Minor bugfixes (on 0.2.2.x):
  7026. - Clients should not weight BadExit nodes as Exits in their node
  7027. selection. Similarly, directory authorities should not count BadExit
  7028. bandwidth as Exit bandwidth when computing bandwidth-weights.
  7029. Bugfix on 0.2.2.10-alpha; fixes bug 2203.
  7030. - Correctly clear our dir_read/dir_write history when there is an
  7031. error parsing any bw history value from the state file. Bugfix on
  7032. Tor 0.2.2.15-alpha.
  7033. - Resolve a bug in verifying signatures of directory objects
  7034. with digests longer than SHA1. Bugfix on 0.2.2.20-alpha.
  7035. Fixes bug 2409. Found by "piebeer".
  7036. - Bridge authorities no longer crash on SIGHUP when they try to
  7037. publish their relay descriptor to themselves. Fixes bug 2572. Bugfix
  7038. on 0.2.2.22-alpha.
  7039. o Minor features:
  7040. - Log less aggressively about circuit timeout changes, and improve
  7041. some other circuit timeout messages. Resolves bug 2004.
  7042. - Log a little more clearly about the times at which we're no longer
  7043. accepting new connections. Resolves bug 2181.
  7044. - Reject attempts at the client side to open connections to private
  7045. IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
  7046. a randomly chosen exit node. Attempts to do so are always
  7047. ill-defined, generally prevented by exit policies, and usually
  7048. in error. This will also help to detect loops in transparent
  7049. proxy configurations. You can disable this feature by setting
  7050. "ClientRejectInternalAddresses 0" in your torrc.
  7051. - Always treat failure to allocate an RSA key as an unrecoverable
  7052. allocation error.
  7053. - Update to the March 1 2011 Maxmind GeoLite Country database.
  7054. o Minor features (log subsystem):
  7055. - Add documentation for configuring logging at different severities in
  7056. different log domains. We've had this feature since 0.2.1.1-alpha,
  7057. but for some reason it never made it into the manpage. Fixes
  7058. bug 2215.
  7059. - Make it simpler to specify "All log domains except for A and B".
  7060. Previously you needed to say "[*,~A,~B]". Now you can just say
  7061. "[~A,~B]".
  7062. - Add a "LogMessageDomains 1" option to include the domains of log
  7063. messages along with the messages. Without this, there's no way
  7064. to use log domains without reading the source or doing a lot
  7065. of guessing.
  7066. o Packaging changes:
  7067. - Stop shipping the Tor specs files and development proposal documents
  7068. in the tarball. They are now in a separate git repository at
  7069. git://git.torproject.org/torspec.git
  7070. Changes in version 0.2.1.30 - 2011-02-23
  7071. Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
  7072. change is a slight tweak to Tor's TLS handshake that makes relays
  7073. and bridges that run this new version reachable from Iran again.
  7074. We don't expect this tweak will win the arms race long-term, but it
  7075. buys us time until we roll out a better solution.
  7076. o Major bugfixes:
  7077. - Stop sending a CLOCK_SKEW controller status event whenever
  7078. we fetch directory information from a relay that has a wrong clock.
  7079. Instead, only inform the controller when it's a trusted authority
  7080. that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
  7081. the rest of bug 1074.
  7082. - Fix a bounds-checking error that could allow an attacker to
  7083. remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
  7084. Found by "piebeer".
  7085. - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
  7086. Tor would ignore their RelayBandwidthBurst setting,
  7087. potentially using more bandwidth than expected. Bugfix on
  7088. 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
  7089. - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
  7090. hidserv" in her torrc. The 'hidserv' argument never controlled
  7091. publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
  7092. o Minor features:
  7093. - Adjust our TLS Diffie-Hellman parameters to match those used by
  7094. Apache's mod_ssl.
  7095. - Update to the February 1 2011 Maxmind GeoLite Country database.
  7096. o Minor bugfixes:
  7097. - Check for and reject overly long directory certificates and
  7098. directory tokens before they have a chance to hit any assertions.
  7099. Bugfix on 0.2.1.28. Found by "doorss".
  7100. - Bring the logic that gathers routerinfos and assesses the
  7101. acceptability of circuits into line. This prevents a Tor OP from
  7102. getting locked in a cycle of choosing its local OR as an exit for a
  7103. path (due to a .exit request) and then rejecting the circuit because
  7104. its OR is not listed yet. It also prevents Tor clients from using an
  7105. OR running in the same instance as an exit (due to a .exit request)
  7106. if the OR does not meet the same requirements expected of an OR
  7107. running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
  7108. o Packaging changes:
  7109. - Stop shipping the Tor specs files and development proposal documents
  7110. in the tarball. They are now in a separate git repository at
  7111. git://git.torproject.org/torspec.git
  7112. - Do not include Git version tags as though they are SVN tags when
  7113. generating a tarball from inside a repository that has switched
  7114. between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  7115. Changes in version 0.2.2.22-alpha - 2011-01-25
  7116. Tor 0.2.2.22-alpha fixes a few more less-critical security issues. The
  7117. main other change is a slight tweak to Tor's TLS handshake that makes
  7118. relays and bridges that run this new version reachable from Iran again.
  7119. We don't expect this tweak will win the arms race long-term, but it
  7120. will buy us a bit more time until we roll out a better solution.
  7121. o Major bugfixes:
  7122. - Fix a bounds-checking error that could allow an attacker to
  7123. remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
  7124. Found by "piebeer".
  7125. - Don't assert when changing from bridge to relay or vice versa
  7126. via the controller. The assert happened because we didn't properly
  7127. initialize our keys in this case. Bugfix on 0.2.2.18-alpha; fixes
  7128. bug 2433. Reported by bastik.
  7129. o Minor features:
  7130. - Adjust our TLS Diffie-Hellman parameters to match those used by
  7131. Apache's mod_ssl.
  7132. - Provide a log message stating which geoip file we're parsing
  7133. instead of just stating that we're parsing the geoip file.
  7134. Implements ticket 2432.
  7135. o Minor bugfixes:
  7136. - Check for and reject overly long directory certificates and
  7137. directory tokens before they have a chance to hit any assertions.
  7138. Bugfix on 0.2.1.28 / 0.2.2.20-alpha. Found by "doorss".
  7139. Changes in version 0.2.2.21-alpha - 2011-01-15
  7140. Tor 0.2.2.21-alpha includes all the patches from Tor 0.2.1.29, which
  7141. continues our recent code security audit work. The main fix resolves
  7142. a remote heap overflow vulnerability that can allow remote code
  7143. execution (CVE-2011-0427). Other fixes address a variety of assert
  7144. and crash bugs, most of which we think are hard to exploit remotely.
  7145. o Major bugfixes (security), also included in 0.2.1.29:
  7146. - Fix a heap overflow bug where an adversary could cause heap
  7147. corruption. This bug probably allows remote code execution
  7148. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  7149. 0.1.2.10-rc.
  7150. - Prevent a denial-of-service attack by disallowing any
  7151. zlib-compressed data whose compression factor is implausibly
  7152. high. Fixes part of bug 2324; reported by "doorss".
  7153. - Zero out a few more keys in memory before freeing them. Fixes
  7154. bug 2384 and part of bug 2385. These key instances found by
  7155. "cypherpunks", based on Andrew Case's report about being able
  7156. to find sensitive data in Tor's memory space if you have enough
  7157. permissions. Bugfix on 0.0.2pre9.
  7158. o Major bugfixes (crashes), also included in 0.2.1.29:
  7159. - Prevent calls to Libevent from inside Libevent log handlers.
  7160. This had potential to cause a nasty set of crashes, especially
  7161. if running Libevent with debug logging enabled, and running
  7162. Tor with a controller watching for low-severity log messages.
  7163. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  7164. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  7165. underflow errors there too. Fixes the other part of bug 2324.
  7166. - Fix a bug where we would assert if we ever had a
  7167. cached-descriptors.new file (or another file read directly into
  7168. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  7169. on 0.2.1.25. Found by doorss.
  7170. - Fix some potential asserts and parsing issues with grossly
  7171. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  7172. Found by doorss.
  7173. o Minor bugfixes (other), also included in 0.2.1.29:
  7174. - Fix a bug with handling misformed replies to reverse DNS lookup
  7175. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  7176. bug reported by doorss.
  7177. - Fix compilation on mingw when a pthreads compatibility library
  7178. has been installed. (We don't want to use it, so we shouldn't
  7179. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  7180. - Fix a bug where we would declare that we had run out of virtual
  7181. addresses when the address space was only half-exhausted. Bugfix
  7182. on 0.1.2.1-alpha.
  7183. - Correctly handle the case where AutomapHostsOnResolve is set but
  7184. no virtual addresses are available. Fixes bug 2328; bugfix on
  7185. 0.1.2.1-alpha. Bug found by doorss.
  7186. - Correctly handle wrapping around when we run out of virtual
  7187. address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
  7188. o Minor features, also included in 0.2.1.29:
  7189. - Update to the January 1 2011 Maxmind GeoLite Country database.
  7190. - Introduce output size checks on all of our decryption functions.
  7191. o Build changes, also included in 0.2.1.29:
  7192. - Tor does not build packages correctly with Automake 1.6 and earlier;
  7193. added a check to Makefile.am to make sure that we're building with
  7194. Automake 1.7 or later.
  7195. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  7196. because we built it with a too-old version of automake. Thus that
  7197. release broke ./configure --enable-openbsd-malloc, which is popular
  7198. among really fast exit relays on Linux.
  7199. o Major bugfixes, new in 0.2.2.21-alpha:
  7200. - Prevent crash/heap corruption when the cbtnummodes consensus
  7201. parameter is set to 0 or large values. Fixes bug 2317; bugfix
  7202. on 0.2.2.14-alpha.
  7203. o Major features, new in 0.2.2.21-alpha:
  7204. - Introduce minimum/maximum values that clients will believe
  7205. from the consensus. Now we'll have a better chance to avoid crashes
  7206. or worse when a consensus param has a weird value.
  7207. o Minor features, new in 0.2.2.21-alpha:
  7208. - Make sure to disable DirPort if running as a bridge. DirPorts aren't
  7209. used on bridges, and it makes bridge scanning somewhat easier.
  7210. - If writing the state file to disk fails, wait up to an hour before
  7211. retrying again, rather than trying again each second. Fixes bug
  7212. 2346; bugfix on Tor 0.1.1.3-alpha.
  7213. - Make Libevent log messages get delivered to controllers later,
  7214. and not from inside the Libevent log handler. This prevents unsafe
  7215. reentrant Libevent calls while still letting the log messages
  7216. get through.
  7217. - Detect platforms that brokenly use a signed size_t, and refuse to
  7218. build there. Found and analyzed by doorss and rransom.
  7219. - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
  7220. Resolves bug 2314.
  7221. o Minor bugfixes, new in 0.2.2.21-alpha:
  7222. - Handle SOCKS messages longer than 128 bytes long correctly, rather
  7223. than waiting forever for them to finish. Fixes bug 2330; bugfix
  7224. on 0.2.0.16-alpha. Found by doorss.
  7225. - Add assertions to check for overflow in arguments to
  7226. base32_encode() and base32_decode(); fix a signed-unsigned
  7227. comparison there too. These bugs are not actually reachable in Tor,
  7228. but it's good to prevent future errors too. Found by doorss.
  7229. - Correctly detect failures to create DNS requests when using Libevent
  7230. versions before v2. (Before Libevent 2, we used our own evdns
  7231. implementation. Its return values for Libevent's evdns_resolve_*()
  7232. functions are not consistent with those from Libevent.) Fixes bug
  7233. 2363; bugfix on 0.2.2.6-alpha. Found by "lodger".
  7234. o Documentation, new in 0.2.2.21-alpha:
  7235. - Document the default socks host and port (127.0.0.1:9050) for
  7236. tor-resolve.
  7237. Changes in version 0.2.1.29 - 2011-01-15
  7238. Tor 0.2.1.29 continues our recent code security audit work. The main
  7239. fix resolves a remote heap overflow vulnerability that can allow remote
  7240. code execution. Other fixes address a variety of assert and crash bugs,
  7241. most of which we think are hard to exploit remotely.
  7242. o Major bugfixes (security):
  7243. - Fix a heap overflow bug where an adversary could cause heap
  7244. corruption. This bug probably allows remote code execution
  7245. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  7246. 0.1.2.10-rc.
  7247. - Prevent a denial-of-service attack by disallowing any
  7248. zlib-compressed data whose compression factor is implausibly
  7249. high. Fixes part of bug 2324; reported by "doorss".
  7250. - Zero out a few more keys in memory before freeing them. Fixes
  7251. bug 2384 and part of bug 2385. These key instances found by
  7252. "cypherpunks", based on Andrew Case's report about being able
  7253. to find sensitive data in Tor's memory space if you have enough
  7254. permissions. Bugfix on 0.0.2pre9.
  7255. o Major bugfixes (crashes):
  7256. - Prevent calls to Libevent from inside Libevent log handlers.
  7257. This had potential to cause a nasty set of crashes, especially
  7258. if running Libevent with debug logging enabled, and running
  7259. Tor with a controller watching for low-severity log messages.
  7260. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  7261. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  7262. underflow errors there too. Fixes the other part of bug 2324.
  7263. - Fix a bug where we would assert if we ever had a
  7264. cached-descriptors.new file (or another file read directly into
  7265. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  7266. on 0.2.1.25. Found by doorss.
  7267. - Fix some potential asserts and parsing issues with grossly
  7268. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  7269. Found by doorss.
  7270. o Minor bugfixes (other):
  7271. - Fix a bug with handling misformed replies to reverse DNS lookup
  7272. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  7273. bug reported by doorss.
  7274. - Fix compilation on mingw when a pthreads compatibility library
  7275. has been installed. (We don't want to use it, so we shouldn't
  7276. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  7277. - Fix a bug where we would declare that we had run out of virtual
  7278. addresses when the address space was only half-exhausted. Bugfix
  7279. on 0.1.2.1-alpha.
  7280. - Correctly handle the case where AutomapHostsOnResolve is set but
  7281. no virtual addresses are available. Fixes bug 2328; bugfix on
  7282. 0.1.2.1-alpha. Bug found by doorss.
  7283. - Correctly handle wrapping around to when we run out of virtual
  7284. address space. Found by cypherpunks, bugfix on 0.2.0.5-alpha.
  7285. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  7286. because we built it with a too-old version of automake. Thus that
  7287. release broke ./configure --enable-openbsd-malloc, which is popular
  7288. among really fast exit relays on Linux.
  7289. o Minor features:
  7290. - Update to the January 1 2011 Maxmind GeoLite Country database.
  7291. - Introduce output size checks on all of our decryption functions.
  7292. o Build changes:
  7293. - Tor does not build packages correctly with Automake 1.6 and earlier;
  7294. added a check to Makefile.am to make sure that we're building with
  7295. Automake 1.7 or later.
  7296. Changes in version 0.2.2.20-alpha - 2010-12-17
  7297. Tor 0.2.2.20-alpha does some code cleanup to reduce the risk of remotely
  7298. exploitable bugs. We also fix a variety of other significant bugs,
  7299. change the IP address for one of our directory authorities, and update
  7300. the minimum version that Tor relays must run to join the network.
  7301. o Major bugfixes:
  7302. - Fix a remotely exploitable bug that could be used to crash instances
  7303. of Tor remotely by overflowing on the heap. Remote-code execution
  7304. hasn't been confirmed, but can't be ruled out. Everyone should
  7305. upgrade. Bugfix on the 0.1.1 series and later.
  7306. - Fix a bug that could break accounting on 64-bit systems with large
  7307. time_t values, making them hibernate for impossibly long intervals.
  7308. Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
  7309. - Fix a logic error in directory_fetches_from_authorities() that
  7310. would cause all _non_-exits refusing single-hop-like circuits
  7311. to fetch from authorities, when we wanted to have _exits_ fetch
  7312. from authorities. Fixes more of 2097. Bugfix on 0.2.2.16-alpha;
  7313. fix by boboper.
  7314. - Fix a stream fairness bug that would cause newer streams on a given
  7315. circuit to get preference when reading bytes from the origin or
  7316. destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
  7317. introduced before the first Tor release, in svn revision r152.
  7318. o Directory authority changes:
  7319. - Change IP address and ports for gabelmoo (v3 directory authority).
  7320. o Minor bugfixes:
  7321. - Avoid crashes when AccountingMax is set on clients. Fixes bug 2235.
  7322. Bugfix on 0.2.2.18-alpha. Diagnosed by boboper.
  7323. - Fix an off-by-one error in calculating some controller command
  7324. argument lengths. Fortunately, this mistake is harmless since
  7325. the controller code does redundant NUL termination too. Found by
  7326. boboper. Bugfix on 0.1.1.1-alpha.
  7327. - Do not dereference NULL if a bridge fails to build its
  7328. extra-info descriptor. Found by an anonymous commenter on
  7329. Trac. Bugfix on 0.2.2.19-alpha.
  7330. o Minor features:
  7331. - Update to the December 1 2010 Maxmind GeoLite Country database.
  7332. - Directory authorities now reject relays running any versions of
  7333. Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
  7334. known bugs that keep RELAY_EARLY cells from working on rendezvous
  7335. circuits. Followup to fix for bug 2081.
  7336. - Directory authorities now reject relays running any version of Tor
  7337. older than 0.2.0.26-rc. That version is the earliest that fetches
  7338. current directory information correctly. Fixes bug 2156.
  7339. - Report only the top 10 ports in exit-port stats in order not to
  7340. exceed the maximum extra-info descriptor length of 50 KB. Implements
  7341. task 2196.
  7342. Changes in version 0.2.1.28 - 2010-12-17
  7343. Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
  7344. exploitable bugs. We also took this opportunity to change the IP address
  7345. for one of our directory authorities, and to update the geoip database
  7346. we ship.
  7347. o Major bugfixes:
  7348. - Fix a remotely exploitable bug that could be used to crash instances
  7349. of Tor remotely by overflowing on the heap. Remote-code execution
  7350. hasn't been confirmed, but can't be ruled out. Everyone should
  7351. upgrade. Bugfix on the 0.1.1 series and later.
  7352. o Directory authority changes:
  7353. - Change IP address and ports for gabelmoo (v3 directory authority).
  7354. o Minor features:
  7355. - Update to the December 1 2010 Maxmind GeoLite Country database.
  7356. Changes in version 0.2.1.27 - 2010-11-23
  7357. Yet another OpenSSL security patch broke its compatibility with Tor:
  7358. Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
  7359. also took this opportunity to fix several crash bugs, integrate a new
  7360. directory authority, and update the bundled GeoIP database.
  7361. o Major bugfixes:
  7362. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  7363. No longer set the tlsext_host_name extension on server SSL objects;
  7364. but continue to set it on client SSL objects. Our goal in setting
  7365. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  7366. bugfix on 0.2.1.1-alpha.
  7367. - Do not log messages to the controller while shrinking buffer
  7368. freelists. Doing so would sometimes make the controller connection
  7369. try to allocate a buffer chunk, which would mess up the internals
  7370. of the freelist and cause an assertion failure. Fixes bug 1125;
  7371. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  7372. - Learn our external IP address when we're a relay or bridge, even if
  7373. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  7374. where we introduced bridge relays that don't need to publish to
  7375. be useful. Fixes bug 2050.
  7376. - Do even more to reject (and not just ignore) annotations on
  7377. router descriptors received anywhere but from the cache. Previously
  7378. we would ignore such annotations at first, but cache them to disk
  7379. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  7380. - When you're using bridges and your network goes away and your
  7381. bridges get marked as down, recover when you attempt a new socks
  7382. connection (if the network is back), rather than waiting up to an
  7383. hour to try fetching new descriptors for your bridges. Bugfix on
  7384. 0.2.0.3-alpha; fixes bug 1981.
  7385. o Major features:
  7386. - Move to the November 2010 Maxmind GeoLite country db (rather
  7387. than the June 2009 ip-to-country GeoIP db) for our statistics that
  7388. count how many users relays are seeing from each country. Now we'll
  7389. have more accurate data, especially for many African countries.
  7390. o New directory authorities:
  7391. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  7392. authority.
  7393. o Minor bugfixes:
  7394. - Fix an assertion failure that could occur in directory caches or
  7395. bridge users when using a very short voting interval on a testing
  7396. network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
  7397. 0.2.0.8-alpha.
  7398. - Enforce multiplicity rules when parsing annotations. Bugfix on
  7399. 0.2.0.8-alpha. Found by piebeer.
  7400. - Allow handshaking OR connections to take a full KeepalivePeriod
  7401. seconds to handshake. Previously, we would close them after
  7402. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  7403. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  7404. for analysis help.
  7405. - When building with --enable-gcc-warnings on OpenBSD, disable
  7406. warnings in system headers. This makes --enable-gcc-warnings
  7407. pass on OpenBSD 4.8.
  7408. o Minor features:
  7409. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  7410. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  7411. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  7412. Servers can start sending this code when enough clients recognize
  7413. it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
  7414. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  7415. Patch from mingw-san.
  7416. o Removed files:
  7417. - Remove the old debian/ directory from the main Tor distribution.
  7418. The official Tor-for-debian git repository lives at the URL
  7419. https://git.torproject.org/debian/tor.git
  7420. - Stop shipping the old doc/website/ directory in the tarball. We
  7421. changed the website format in late 2010, and what we shipped in
  7422. 0.2.1.26 really wasn't that useful anyway.
  7423. Changes in version 0.2.2.19-alpha - 2010-11-22
  7424. Yet another OpenSSL security patch broke its compatibility with Tor:
  7425. Tor 0.2.2.19-alpha makes relays work with OpenSSL 0.9.8p and 1.0.0.b.
  7426. o Major bugfixes:
  7427. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  7428. No longer set the tlsext_host_name extension on server SSL objects;
  7429. but continue to set it on client SSL objects. Our goal in setting
  7430. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  7431. bugfix on 0.2.1.1-alpha.
  7432. o Minor bugfixes:
  7433. - Try harder not to exceed the maximum length of 50 KB when writing
  7434. statistics to extra-info descriptors. This bug was triggered by very
  7435. fast relays reporting exit-port, entry, and dirreq statistics.
  7436. Reported by Olaf Selke. Bugfix on 0.2.2.1-alpha. Fixes bug 2183.
  7437. - Publish a router descriptor even if generating an extra-info
  7438. descriptor fails. Previously we would not publish a router
  7439. descriptor without an extra-info descriptor; this can cause fast
  7440. exit relays collecting exit-port statistics to drop from the
  7441. consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
  7442. Changes in version 0.2.2.18-alpha - 2010-11-16
  7443. Tor 0.2.2.18-alpha fixes several crash bugs that have been nagging
  7444. us lately, makes unpublished bridge relays able to detect their IP
  7445. address, and fixes a wide variety of other bugs to get us much closer
  7446. to a stable release.
  7447. o Major bugfixes:
  7448. - Do even more to reject (and not just ignore) annotations on
  7449. router descriptors received anywhere but from the cache. Previously
  7450. we would ignore such annotations at first, but cache them to disk
  7451. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  7452. - Do not log messages to the controller while shrinking buffer
  7453. freelists. Doing so would sometimes make the controller connection
  7454. try to allocate a buffer chunk, which would mess up the internals
  7455. of the freelist and cause an assertion failure. Fixes bug 1125;
  7456. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  7457. - Learn our external IP address when we're a relay or bridge, even if
  7458. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  7459. where we introduced bridge relays that don't need to publish to
  7460. be useful. Fixes bug 2050.
  7461. - Maintain separate TLS contexts and certificates for incoming and
  7462. outgoing connections in bridge relays. Previously we would use the
  7463. same TLS contexts and certs for incoming and outgoing connections.
  7464. Bugfix on 0.2.0.3-alpha; addresses bug 988.
  7465. - Maintain separate identity keys for incoming and outgoing TLS
  7466. contexts in bridge relays. Previously we would use the same
  7467. identity keys for incoming and outgoing TLS contexts. Bugfix on
  7468. 0.2.0.3-alpha; addresses the other half of bug 988.
  7469. - Avoid an assertion failure when we as an authority receive a
  7470. duplicate upload of a router descriptor that we already have,
  7471. but which we previously considered an obsolete descriptor.
  7472. Fixes another case of bug 1776. Bugfix on 0.2.2.16-alpha.
  7473. - Avoid a crash bug triggered by looking at a dangling pointer while
  7474. setting the network status consensus. Found by Robert Ransom.
  7475. Bugfix on 0.2.2.17-alpha. Fixes bug 2097.
  7476. - Fix a logic error where servers that _didn't_ act as exits would
  7477. try to keep their server lists more aggressively up to date than
  7478. exits, when it was supposed to be the other way around. Bugfix
  7479. on 0.2.2.17-alpha.
  7480. o Minor bugfixes (on Tor 0.2.1.x and earlier):
  7481. - When we're trying to guess whether we know our IP address as
  7482. a relay, we would log various ways that we failed to guess
  7483. our address, but never log that we ended up guessing it
  7484. successfully. Now add a log line to help confused and anxious
  7485. relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
  7486. - Bring the logic that gathers routerinfos and assesses the
  7487. acceptability of circuits into line. This prevents a Tor OP from
  7488. getting locked in a cycle of choosing its local OR as an exit for a
  7489. path (due to a .exit request) and then rejecting the circuit because
  7490. its OR is not listed yet. It also prevents Tor clients from using an
  7491. OR running in the same instance as an exit (due to a .exit request)
  7492. if the OR does not meet the same requirements expected of an OR
  7493. running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
  7494. - Correctly describe errors that occur when generating a TLS object.
  7495. Previously we would attribute them to a failure while generating a
  7496. TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
  7497. bug 1994.
  7498. - Enforce multiplicity rules when parsing annotations. Bugfix on
  7499. 0.2.0.8-alpha. Found by piebeer.
  7500. - Fix warnings that newer versions of autoconf produced during
  7501. ./autogen.sh. These warnings appear to be harmless in our case,
  7502. but they were extremely verbose. Fixes bug 2020.
  7503. o Minor bugfixes (on Tor 0.2.2.x):
  7504. - Enable protection of small arrays whenever we build with gcc
  7505. hardening features, not only when also building with warnings
  7506. enabled. Fixes bug 2031; bugfix on 0.2.2.14-alpha. Reported by keb.
  7507. o Minor features:
  7508. - Make hidden services work better in private Tor networks by not
  7509. requiring any uptime to join the hidden service descriptor
  7510. DHT. Implements ticket 2088.
  7511. - Rate-limit the "your application is giving Tor only an IP address"
  7512. warning. Addresses bug 2000; bugfix on 0.0.8pre2.
  7513. - When AllowSingleHopExits is set, print a warning to explain to the
  7514. relay operator why most clients are avoiding her relay.
  7515. - Update to the November 1 2010 Maxmind GeoLite Country database.
  7516. o Code simplifications and refactoring:
  7517. - When we fixed bug 1038 we had to put in a restriction not to send
  7518. RELAY_EARLY cells on rend circuits. This was necessary as long
  7519. as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
  7520. active. Now remove this obsolete check. Resolves bug 2081.
  7521. - Some options used different conventions for uppercasing of acronyms
  7522. when comparing manpage and source. Fix those in favor of the
  7523. manpage, as it makes sense to capitalize acronyms.
  7524. - Remove the torrc.complete file. It hasn't been kept up to date
  7525. and users will have better luck checking out the manpage.
  7526. - Remove the obsolete "NoPublish" option; it has been flagged
  7527. as obsolete and has produced a warning since 0.1.1.18-rc.
  7528. - Remove everything related to building the expert bundle for OS X.
  7529. It has confused many users, doesn't work right on OS X 10.6,
  7530. and is hard to get rid of once installed. Resolves bug 1274.
  7531. Changes in version 0.2.2.17-alpha - 2010-09-30
  7532. Tor 0.2.2.17-alpha introduces a feature to make it harder for clients
  7533. to use one-hop circuits (which can put the exit relays at higher risk,
  7534. plus unbalance the network); fixes a big bug in bandwidth accounting
  7535. for relays that want to limit their monthly bandwidth use; fixes a
  7536. big pile of bugs in how clients tolerate temporary network failure;
  7537. and makes our adaptive circuit build timeout feature (which improves
  7538. client performance if your network is fast while not breaking things
  7539. if your network is slow) better handle bad networks.
  7540. o Major features:
  7541. - Exit relays now try harder to block exit attempts from unknown
  7542. relays, to make it harder for people to use them as one-hop proxies
  7543. a la tortunnel. Controlled by the refuseunknownexits consensus
  7544. parameter (currently enabled), or you can override it on your
  7545. relay with the RefuseUnknownExits torrc option. Resolves bug 1751.
  7546. o Major bugfixes (0.2.1.x and earlier):
  7547. - Fix a bug in bandwidth accounting that could make us use twice
  7548. the intended bandwidth when our interval start changes due to
  7549. daylight saving time. Now we tolerate skew in stored vs computed
  7550. interval starts: if the start of the period changes by no more than
  7551. 50% of the period's duration, we remember bytes that we transferred
  7552. in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
  7553. - Always search the Windows system directory for system DLLs, and
  7554. nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
  7555. - When you're using bridges and your network goes away and your
  7556. bridges get marked as down, recover when you attempt a new socks
  7557. connection (if the network is back), rather than waiting up to an
  7558. hour to try fetching new descriptors for your bridges. Bugfix on
  7559. 0.2.0.3-alpha; fixes bug 1981.
  7560. o Major bugfixes (on 0.2.2.x):
  7561. - Fix compilation on Windows. Bugfix on 0.2.2.16-alpha; related to
  7562. bug 1797.
  7563. - Fix a segfault that could happen when operating a bridge relay with
  7564. no GeoIP database set. Fixes bug 1964; bugfix on 0.2.2.15-alpha.
  7565. - The consensus bandwidth-weights (used by clients to choose fast
  7566. relays) entered an unexpected edge case in September where
  7567. Exits were much scarcer than Guards, resulting in bad weight
  7568. recommendations. Now we compute them using new constraints that
  7569. should succeed in all cases. Also alter directory authorities to
  7570. not include the bandwidth-weights line if they fail to produce
  7571. valid values. Fixes bug 1952; bugfix on 0.2.2.10-alpha.
  7572. - When weighting bridges during path selection, we used to trust
  7573. the bandwidths they provided in their descriptor, only capping them
  7574. at 10MB/s. This turned out to be problematic for two reasons:
  7575. Bridges could claim to handle a lot more traffic then they
  7576. actually would, thus making more clients pick them and have a
  7577. pretty effective DoS attack. The other issue is that new bridges
  7578. that might not have a good estimate for their bw capacity yet
  7579. would not get used at all unless no other bridges are available
  7580. to a client. Fixes bug 1912; bugfix on 0.2.2.7-alpha.
  7581. o Major bugfixes (on the circuit build timeout feature, 0.2.2.x):
  7582. - Ignore cannibalized circuits when recording circuit build times.
  7583. This should provide for a minor performance improvement for hidden
  7584. service users using 0.2.2.14-alpha, and should remove two spurious
  7585. notice log messages. Bugfix on 0.2.2.14-alpha; fixes bug 1740.
  7586. - Simplify the logic that causes us to decide if the network is
  7587. unavailable for purposes of recording circuit build times. If we
  7588. receive no cells whatsoever for the entire duration of a circuit's
  7589. full measured lifetime, the network is probably down. Also ignore
  7590. one-hop directory fetching circuit timeouts when calculating our
  7591. circuit build times. These changes should hopefully reduce the
  7592. cases where we see ridiculous circuit build timeouts for people
  7593. with spotty wireless connections. Fixes part of bug 1772; bugfix
  7594. on 0.2.2.2-alpha.
  7595. - Prevent the circuit build timeout from becoming larger than
  7596. the maximum build time we have ever seen. Also, prevent the time
  7597. period for measurement circuits from becoming larger than twice that
  7598. value. Fixes the other part of bug 1772; bugfix on 0.2.2.2-alpha.
  7599. o Minor features:
  7600. - When we run out of directory information such that we can't build
  7601. circuits, but then get enough that we can build circuits, log when
  7602. we actually construct a circuit, so the user has a better chance of
  7603. knowing what's going on. Fixes bug 1362.
  7604. - Be more generous with how much bandwidth we'd use up (with
  7605. accounting enabled) before entering "soft hibernation". Previously,
  7606. we'd refuse new connections and circuits once we'd used up 95% of
  7607. our allotment. Now, we use up 95% of our allotment, AND make sure
  7608. that we have no more than 500MB (or 3 hours of expected traffic,
  7609. whichever is lower) remaining before we enter soft hibernation.
  7610. - If we've configured EntryNodes and our network goes away and/or all
  7611. our entrynodes get marked down, optimistically retry them all when
  7612. a new socks application request appears. Fixes bug 1882.
  7613. - Add some more defensive programming for architectures that can't
  7614. handle unaligned integer accesses. We don't know of any actual bugs
  7615. right now, but that's the best time to fix them. Fixes bug 1943.
  7616. - Support line continuations in the torrc config file. If a line
  7617. ends with a single backslash character, the newline is ignored, and
  7618. the configuration value is treated as continuing on the next line.
  7619. Resolves bug 1929.
  7620. o Minor bugfixes (on 0.2.1.x and earlier):
  7621. - For bandwidth accounting, calculate our expected bandwidth rate
  7622. based on the time during which we were active and not in
  7623. soft-hibernation during the last interval. Previously, we were
  7624. also considering the time spent in soft-hibernation. If this
  7625. was a long time, we would wind up underestimating our bandwidth
  7626. by a lot, and skewing our wakeup time towards the start of the
  7627. accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
  7628. o Minor bugfixes (on 0.2.2.x):
  7629. - Resume generating CIRC FAILED REASON=TIMEOUT control port messages,
  7630. which were disabled by the circuit build timeout changes in
  7631. 0.2.2.14-alpha. Bugfix on 0.2.2.14-alpha; fixes bug 1739.
  7632. - Make sure we don't warn about missing bandwidth weights when
  7633. choosing bridges or other relays not in the consensus. Bugfix on
  7634. 0.2.2.10-alpha; fixes bug 1805.
  7635. - In our logs, do not double-report signatures from unrecognized
  7636. authorities both as "from unknown authority" and "not
  7637. present". Fixes bug 1956, bugfix on 0.2.2.16-alpha.
  7638. Changes in version 0.2.2.16-alpha - 2010-09-17
  7639. Tor 0.2.2.16-alpha fixes a variety of old stream fairness bugs (most
  7640. evident at exit relays), and also continues to resolve all the little
  7641. bugs that have been filling up trac lately.
  7642. o Major bugfixes (stream-level fairness):
  7643. - When receiving a circuit-level SENDME for a blocked circuit, try
  7644. to package cells fairly from all the streams that had previously
  7645. been blocked on that circuit. Previously, we had started with the
  7646. oldest stream, and allowed each stream to potentially exhaust
  7647. the circuit's package window. This gave older streams on any
  7648. given circuit priority over newer ones. Fixes bug 1937. Detected
  7649. originally by Camilo Viecco. This bug was introduced before the
  7650. first Tor release, in svn commit r152: it is the new winner of
  7651. the longest-lived bug prize.
  7652. - When the exit relay got a circuit-level sendme cell, it started
  7653. reading on the exit streams, even if had 500 cells queued in the
  7654. circuit queue already, so the circuit queue just grew and grew in
  7655. some cases. We fix this by not re-enabling reading on receipt of a
  7656. sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
  7657. on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
  7658. "yetonetime".
  7659. - Newly created streams were allowed to read cells onto circuits,
  7660. even if the circuit's cell queue was blocked and waiting to drain.
  7661. This created potential unfairness, as older streams would be
  7662. blocked, but newer streams would gladly fill the queue completely.
  7663. We add code to detect this situation and prevent any stream from
  7664. getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
  7665. fixes bug 1298.
  7666. o Minor features:
  7667. - Update to the September 1 2010 Maxmind GeoLite Country database.
  7668. - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
  7669. not. This would lead to a cookie that is still not group readable.
  7670. Closes bug 1843. Suggested by katmagic.
  7671. - When logging a rate-limited warning, we now mention how many messages
  7672. got suppressed since the last warning.
  7673. - Add new "perconnbwrate" and "perconnbwburst" consensus params to
  7674. do individual connection-level rate limiting of clients. The torrc
  7675. config options with the same names trump the consensus params, if
  7676. both are present. Replaces the old "bwconnrate" and "bwconnburst"
  7677. consensus params which were broken from 0.2.2.7-alpha through
  7678. 0.2.2.14-alpha. Closes bug 1947.
  7679. - When a router changes IP address or port, authorities now launch
  7680. a new reachability test for it. Implements ticket 1899.
  7681. - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
  7682. 2 no signature, 4 required" messages about consensus signatures
  7683. easier to read, and make sure they get logged at the same severity
  7684. as the messages explaining which keys are which. Fixes bug 1290.
  7685. - Don't warn when we have a consensus that we can't verify because
  7686. of missing certificates, unless those certificates are ones
  7687. that we have been trying and failing to download. Fixes bug 1145.
  7688. - If you configure your bridge with a known identity fingerprint,
  7689. and the bridge authority is unreachable (as it is in at least
  7690. one country now), fall back to directly requesting the descriptor
  7691. from the bridge. Finishes the feature started in 0.2.0.10-alpha;
  7692. closes bug 1138.
  7693. - When building with --enable-gcc-warnings on OpenBSD, disable
  7694. warnings in system headers. This makes --enable-gcc-warnings
  7695. pass on OpenBSD 4.8.
  7696. o Minor bugfixes (on 0.2.1.x and earlier):
  7697. - Authorities will now attempt to download consensuses if their
  7698. own efforts to make a live consensus have failed. This change
  7699. means authorities that restart will fetch a valid consensus, and
  7700. it means authorities that didn't agree with the current consensus
  7701. will still fetch and serve it if it has enough signatures. Bugfix
  7702. on 0.2.0.9-alpha; fixes bug 1300.
  7703. - Ensure DNS requests launched by "RESOLVE" commands from the
  7704. controller respect the __LeaveStreamsUnattached setconf options. The
  7705. same goes for requests launched via DNSPort or transparent
  7706. proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
  7707. - Allow handshaking OR connections to take a full KeepalivePeriod
  7708. seconds to handshake. Previously, we would close them after
  7709. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  7710. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  7711. for analysis help.
  7712. - Rate-limit "Failed to hand off onionskin" warnings.
  7713. - Never relay a cell for a circuit we have already destroyed.
  7714. Between marking a circuit as closeable and finally closing it,
  7715. it may have been possible for a few queued cells to get relayed,
  7716. even though they would have been immediately dropped by the next
  7717. OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
  7718. - Never queue a cell for a circuit that's already been marked
  7719. for close.
  7720. - Never vote for a server as "Running" if we have a descriptor for
  7721. it claiming to be hibernating, and that descriptor was published
  7722. more recently than our last contact with the server. Bugfix on
  7723. 0.2.0.3-alpha; fixes bug 911.
  7724. - Squash a compile warning on OpenBSD. Reported by Tas; fixes
  7725. bug 1848.
  7726. o Minor bugfixes (on 0.2.2.x):
  7727. - Fix a regression introduced in 0.2.2.7-alpha that marked relays
  7728. down if a directory fetch fails and you've configured either
  7729. bridges or EntryNodes. The intent was to mark the relay as down
  7730. _unless_ you're using bridges or EntryNodes, since if you are
  7731. then you could quickly run out of entry points.
  7732. - Fix the Windows directory-listing code. A bug introduced in
  7733. 0.2.2.14-alpha could make Windows directory servers forget to load
  7734. some of their cached v2 networkstatus files.
  7735. - Really allow clients to use relays as bridges. Fixes bug 1776;
  7736. bugfix on 0.2.2.15-alpha.
  7737. - Demote a warn to info that happens when the CellStatistics option
  7738. was just enabled. Bugfix on 0.2.2.15-alpha; fixes bug 1921.
  7739. Reported by Moritz Bartl.
  7740. - On Windows, build correctly either with or without Unicode support.
  7741. This is necessary so that Tor can support fringe platforms like
  7742. Windows 98 (which has no Unicode), or Windows CE (which has no
  7743. non-Unicode). Bugfix on 0.2.2.14-alpha; fixes bug 1797.
  7744. o Testing
  7745. - Add a unit test for cross-platform directory-listing code.
  7746. Changes in version 0.2.2.15-alpha - 2010-08-18
  7747. Tor 0.2.2.15-alpha fixes a big bug in hidden service availability,
  7748. fixes a variety of other bugs that were preventing performance
  7749. experiments from moving forward, fixes several bothersome memory leaks,
  7750. and generally closes a lot of smaller bugs that have been filling up
  7751. trac lately.
  7752. o Major bugfixes:
  7753. - Stop assigning the HSDir flag to relays that disable their
  7754. DirPort (and thus will refuse to answer directory requests). This
  7755. fix should dramatically improve the reachability of hidden services:
  7756. hidden services and hidden service clients pick six HSDir relays
  7757. to store and retrieve the hidden service descriptor, and currently
  7758. about half of the HSDir relays will refuse to work. Bugfix on
  7759. 0.2.0.10-alpha; fixes part of bug 1693.
  7760. - The PerConnBWRate and Burst config options, along with the
  7761. bwconnrate and bwconnburst consensus params, initialized each conn's
  7762. token bucket values only when the connection is established. Now we
  7763. update them if the config options change, and update them every time
  7764. we get a new consensus. Otherwise we can encounter an ugly edge
  7765. case where we initialize an OR conn to client-level bandwidth,
  7766. but then later the relay joins the consensus and we leave it
  7767. throttled. Bugfix on 0.2.2.7-alpha; fixes bug 1830.
  7768. - Fix a regression that caused Tor to rebind its ports if it receives
  7769. SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
  7770. o Major features:
  7771. - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
  7772. should give us approximately 40-50% more Guard-flagged nodes,
  7773. improving the anonymity the Tor network can provide and also
  7774. decreasing the dropoff in throughput that relays experience when
  7775. they first get the Guard flag.
  7776. - Allow enabling or disabling the *Statistics config options while
  7777. Tor is running.
  7778. o Minor features:
  7779. - Update to the August 1 2010 Maxmind GeoLite Country database.
  7780. - Have the controller interface give a more useful message than
  7781. "Internal Error" in response to failed GETINFO requests.
  7782. - Warn when the same option is provided more than once in a torrc
  7783. file, on the command line, or in a single SETCONF statement, and
  7784. the option is one that only accepts a single line. Closes bug 1384.
  7785. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  7786. Patch from mingw-san.
  7787. - Add support for the country code "{??}" in torrc options like
  7788. ExcludeNodes, to indicate all routers of unknown country. Closes
  7789. bug 1094.
  7790. - Relays report the number of bytes spent on answering directory
  7791. requests in extra-info descriptors similar to {read,write}-history.
  7792. Implements enhancement 1790.
  7793. o Minor bugfixes (on 0.2.1.x and earlier):
  7794. - Complain if PublishServerDescriptor is given multiple arguments that
  7795. include 0 or 1. This configuration will be rejected in the future.
  7796. Bugfix on 0.2.0.1-alpha; closes bug 1107.
  7797. - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
  7798. Bugfix on 0.2.0.13-alpha; closes bug 928.
  7799. - Change "Application request when we're believed to be offline."
  7800. notice to "Application request when we haven't used client
  7801. functionality lately.", to clarify that it's not an error. Bugfix
  7802. on 0.0.9.3; fixes bug 1222.
  7803. - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
  7804. would return "551 Internal error" rather than "552 Unrecognized key
  7805. ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
  7806. - Users can't configure a regular relay to be their bridge. It didn't
  7807. work because when Tor fetched the bridge descriptor, it found
  7808. that it already had it, and didn't realize that the purpose of the
  7809. descriptor had changed. Now we replace routers with a purpose other
  7810. than bridge with bridge descriptors when fetching them. Bugfix on
  7811. 0.1.1.9-alpha. Bug 1776 not yet fixed because now we immediately
  7812. refetch the descriptor with router purpose 'general', disabling
  7813. it as a bridge.
  7814. - Fix a rare bug in rend_fn unit tests: we would fail a test when
  7815. a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
  7816. on 0.2.0.10-alpha; fixes bug 1808.
  7817. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  7818. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  7819. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  7820. Servers can start sending this code when enough clients recognize
  7821. it. Also update the spec to reflect this new reason. Bugfix on
  7822. 0.1.0.1-rc; fixes part of bug 1793.
  7823. - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
  7824. when we switch from being a public relay to a bridge. Otherwise
  7825. there will still be clients that see the relay in their consensus,
  7826. and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes bug
  7827. 932 even more.
  7828. - Instead of giving an assertion failure on an internal mismatch
  7829. on estimated freelist size, just log a BUG warning and try later.
  7830. Mitigates but does not fix bug 1125.
  7831. - Fix an assertion failure that could occur in caches or bridge users
  7832. when using a very short voting interval on a testing network.
  7833. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on 0.2.0.8-alpha.
  7834. o Minor bugfixes (on 0.2.2.x):
  7835. - Alter directory authorities to always consider Exit-flagged nodes
  7836. as potential Guard nodes in their votes. The actual decision to
  7837. use Exits as Guards is done in the consensus bandwidth weights.
  7838. Fixes bug 1294; bugfix on 0.2.2.10-alpha.
  7839. - When the controller is reporting the purpose of circuits that
  7840. didn't finish building before the circuit build timeout, it was
  7841. printing UNKNOWN_13. Now print EXPIRED. Bugfix on 0.2.2.14-alpha.
  7842. - Our libevent version parsing code couldn't handle versions like
  7843. 1.4.14b-stable and incorrectly warned the user about using an
  7844. old and broken version of libevent. Treat 1.4.14b-stable like
  7845. 1.4.14-stable when parsing the version. Fixes bug 1731; bugfix
  7846. on 0.2.2.1-alpha.
  7847. - Don't use substitution references like $(VAR:MOD) when
  7848. $(asciidoc_files) is empty -- make(1) on NetBSD transforms
  7849. '$(:x)' to 'x' rather than the empty string. This bites us in
  7850. doc/ when configured with --disable-asciidoc. Bugfix on
  7851. 0.2.2.9-alpha; fixes bug 1773.
  7852. - Remove a spurious hidden service server-side log notice about
  7853. "Ancient non-dirty circuits". Bugfix on 0.2.2.14-alpha; fixes
  7854. bug 1741.
  7855. - Fix compilation with --with-dmalloc set. Bugfix on 0.2.2.6-alpha;
  7856. fixes bug 1832.
  7857. - Correctly report written bytes on linked connections. Found while
  7858. implementing 1790. Bugfix on 0.2.2.4-alpha.
  7859. - Fix three memory leaks: one in circuit_build_times_parse_state(),
  7860. one in dirvote_add_signatures_to_pending_consensus(), and one every
  7861. time we parse a v3 network consensus. Bugfixes on 0.2.2.14-alpha,
  7862. 0.2.2.6-alpha, and 0.2.2.10-alpha respectively; fixes bug 1831.
  7863. o Code simplifications and refactoring:
  7864. - Take a first step towards making or.h smaller by splitting out
  7865. function definitions for all source files in src/or/. Leave
  7866. structures and defines in or.h for now.
  7867. - Remove a bunch of unused function declarations as well as a block of
  7868. #if 0'd code from the unit tests. Closes bug 1824.
  7869. - New unit tests for exit-port history statistics; refactored exit
  7870. statistics code to be more easily tested.
  7871. - Remove the old debian/ directory from the main Tor distribution.
  7872. The official Tor-for-debian git repository lives at the URL
  7873. https://git.torproject.org/debian/tor.git
  7874. Changes in version 0.2.2.14-alpha - 2010-07-12
  7875. Tor 0.2.2.14-alpha greatly improves client-side handling of
  7876. circuit build timeouts, which are used to estimate speed and improve
  7877. performance. We also move to a much better GeoIP database, port Tor to
  7878. Windows CE, introduce new compile flags that improve code security,
  7879. add an eighth v3 directory authority, and address a lot of more
  7880. minor issues.
  7881. o Major bugfixes:
  7882. - Tor directory authorities no longer crash when started with a
  7883. cached-microdesc-consensus file in their data directory. Bugfix
  7884. on 0.2.2.6-alpha; fixes bug 1532.
  7885. - Treat an unset $HOME like an empty $HOME rather than triggering an
  7886. assert. Bugfix on 0.0.8pre1; fixes bug 1522.
  7887. - Ignore negative and large circuit build timeout values that can
  7888. happen during a suspend or hibernate. These values caused various
  7889. asserts to fire. Bugfix on 0.2.2.2-alpha; fixes bug 1245.
  7890. - Alter calculation of Pareto distribution parameter 'Xm' for
  7891. Circuit Build Timeout learning to use the weighted average of the
  7892. top N=3 modes (because we have three entry guards). Considering
  7893. multiple modes should improve the timeout calculation in some cases,
  7894. and prevent extremely high timeout values. Bugfix on 0.2.2.2-alpha;
  7895. fixes bug 1335.
  7896. - Alter calculation of Pareto distribution parameter 'Alpha' to use a
  7897. right censored distribution model. This approach improves over the
  7898. synthetic timeout generation approach that was producing insanely
  7899. high timeout values. Now we calculate build timeouts using truncated
  7900. times. Bugfix on 0.2.2.2-alpha; fixes bugs 1245 and 1335.
  7901. - Do not close circuits that are under construction when they reach
  7902. the circuit build timeout. Instead, leave them building (but do not
  7903. use them) for up until the time corresponding to the 95th percentile
  7904. on the Pareto CDF or 60 seconds, whichever is greater. This is done
  7905. to provide better data for the new Pareto model. This percentile
  7906. can be controlled by the consensus.
  7907. o Major features:
  7908. - Move to the June 2010 Maxmind GeoLite country db (rather than the
  7909. June 2009 ip-to-country GeoIP db) for our statistics that count
  7910. how many users relays are seeing from each country. Now we have
  7911. more accurate data for many African countries.
  7912. - Port Tor to build and run correctly on Windows CE systems, using
  7913. the wcecompat library. Contributed by Valerio Lupi.
  7914. - New "--enable-gcc-hardening" ./configure flag (off by default)
  7915. to turn on gcc compile time hardening options. It ensures
  7916. that signed ints have defined behavior (-fwrapv), enables
  7917. -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
  7918. with canaries (-fstack-protector-all), turns on ASLR protection if
  7919. supported by the kernel (-fPIE, -pie), and adds additional security
  7920. related warnings. Verified to work on Mac OS X and Debian Lenny.
  7921. - New "--enable-linker-hardening" ./configure flag (off by default)
  7922. to turn on ELF specific hardening features (relro, now). This does
  7923. not work with Mac OS X or any other non-ELF binary format.
  7924. o New directory authorities:
  7925. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  7926. authority.
  7927. o Minor features:
  7928. - New config option "WarnUnsafeSocks 0" disables the warning that
  7929. occurs whenever Tor receives a socks handshake using a version of
  7930. the socks protocol that can only provide an IP address (rather
  7931. than a hostname). Setups that do DNS locally over Tor are fine,
  7932. and we shouldn't spam the logs in that case.
  7933. - Convert the HACKING file to asciidoc, and add a few new sections
  7934. to it, explaining how we use Git, how we make changelogs, and
  7935. what should go in a patch.
  7936. - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
  7937. event, to give information on the current rate of circuit timeouts
  7938. over our stored history.
  7939. - Add ability to disable circuit build time learning via consensus
  7940. parameter and via a LearnCircuitBuildTimeout config option. Also
  7941. automatically disable circuit build time calculation if we are
  7942. either a AuthoritativeDirectory, or if we fail to write our state
  7943. file. Fixes bug 1296.
  7944. - More gracefully handle corrupt state files, removing asserts
  7945. in favor of saving a backup and resetting state.
  7946. - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
  7947. system headers.
  7948. o Minor bugfixes:
  7949. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  7950. enabled.
  7951. - When a2x fails, mention that the user could disable manpages instead
  7952. of trying to fix their asciidoc installation.
  7953. - Where available, use Libevent 2.0's periodic timers so that our
  7954. once-per-second cleanup code gets called even more closely to
  7955. once per second than it would otherwise. Fixes bug 943.
  7956. - If you run a bridge that listens on multiple IP addresses, and
  7957. some user configures a bridge address that uses a different IP
  7958. address than your bridge writes in its router descriptor, and the
  7959. user doesn't specify an identity key, their Tor would discard the
  7960. descriptor because "it isn't one of our configured bridges", and
  7961. fail to bootstrap. Now believe the descriptor and bootstrap anyway.
  7962. Bugfix on 0.2.0.3-alpha.
  7963. - If OpenSSL fails to make a duplicate of a private or public key, log
  7964. an error message and try to exit cleanly. May help with debugging
  7965. if bug 1209 ever remanifests.
  7966. - Save a couple bytes in memory allocation every time we escape
  7967. certain characters in a string. Patch from Florian Zumbiehl.
  7968. - Make it explicit that we don't cannibalize one-hop circuits. This
  7969. happens in the wild, but doesn't turn out to be a problem because
  7970. we fortunately don't use those circuits. Many thanks to outofwords
  7971. for the initial analysis and to swissknife who confirmed that
  7972. two-hop circuits are actually created.
  7973. - Make directory mirrors report non-zero dirreq-v[23]-shares again.
  7974. Fixes bug 1564; bugfix on 0.2.2.9-alpha.
  7975. - Eliminate a case where a circuit build time warning was displayed
  7976. after network connectivity resumed. Bugfix on 0.2.2.2-alpha.
  7977. Changes in version 0.2.1.26 - 2010-05-02
  7978. Tor 0.2.1.26 addresses the recent connection and memory overload
  7979. problems we've been seeing on relays, especially relays with their
  7980. DirPort open. If your relay has been crashing, or you turned it off
  7981. because it used too many resources, give this release a try.
  7982. This release also fixes yet another instance of broken OpenSSL libraries
  7983. that was causing some relays to drop out of the consensus.
  7984. o Major bugfixes:
  7985. - Teach relays to defend themselves from connection overload. Relays
  7986. now close idle circuits early if it looks like they were intended
  7987. for directory fetches. Relays are also more aggressive about closing
  7988. TLS connections that have no circuits on them. Such circuits are
  7989. unlikely to be re-used, and tens of thousands of them were piling
  7990. up at the fast relays, causing the relays to run out of sockets
  7991. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  7992. their directory fetches over TLS).
  7993. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  7994. that claim to be earlier than 0.9.8m, but which have in reality
  7995. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  7996. behavior. Possible fix for some cases of bug 1346.
  7997. - Directory mirrors were fetching relay descriptors only from v2
  7998. directory authorities, rather than v3 authorities like they should.
  7999. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  8000. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  8001. o Minor bugfixes:
  8002. - Finally get rid of the deprecated and now harmful notion of "clique
  8003. mode", where directory authorities maintain TLS connections to
  8004. every other relay.
  8005. o Testsuite fixes:
  8006. - In the util/threads test, no longer free the test_mutex before all
  8007. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  8008. - The master thread could starve the worker threads quite badly on
  8009. certain systems, causing them to run only partially in the allowed
  8010. window. This resulted in test failures. Now the master thread sleeps
  8011. occasionally for a few microseconds while the two worker-threads
  8012. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  8013. Changes in version 0.2.2.13-alpha - 2010-04-24
  8014. Tor 0.2.2.13-alpha addresses the recent connection and memory overload
  8015. problems we've been seeing on relays, especially relays with their
  8016. DirPort open. If your relay has been crashing, or you turned it off
  8017. because it used too many resources, give this release a try.
  8018. o Major bugfixes:
  8019. - Teach relays to defend themselves from connection overload. Relays
  8020. now close idle circuits early if it looks like they were intended
  8021. for directory fetches. Relays are also more aggressive about closing
  8022. TLS connections that have no circuits on them. Such circuits are
  8023. unlikely to be re-used, and tens of thousands of them were piling
  8024. up at the fast relays, causing the relays to run out of sockets
  8025. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  8026. their directory fetches over TLS).
  8027. o Minor features:
  8028. - Finally get rid of the deprecated and now harmful notion of "clique
  8029. mode", where directory authorities maintain TLS connections to
  8030. every other relay.
  8031. - Directory authorities now do an immediate reachability check as soon
  8032. as they hear about a new relay. This change should slightly reduce
  8033. the time between setting up a relay and getting listed as running
  8034. in the consensus. It should also improve the time between setting
  8035. up a bridge and seeing use by bridge users.
  8036. - Directory authorities no longer launch a TLS connection to every
  8037. relay as they startup. Now that we have 2k+ descriptors cached,
  8038. the resulting network hiccup is becoming a burden. Besides,
  8039. authorities already avoid voting about Running for the first half
  8040. hour of their uptime.
  8041. Changes in version 0.2.2.12-alpha - 2010-04-20
  8042. Tor 0.2.2.12-alpha fixes a critical bug in how directory authorities
  8043. handle and vote on descriptors. It was causing relays to drop out of
  8044. the consensus.
  8045. o Major bugfixes:
  8046. - Many relays have been falling out of the consensus lately because
  8047. not enough authorities know about their descriptor for them to get
  8048. a majority of votes. When we deprecated the v2 directory protocol,
  8049. we got rid of the only way that v3 authorities can hear from each
  8050. other about other descriptors. Now authorities examine every v3
  8051. vote for new descriptors, and fetch them from that authority. Bugfix
  8052. on 0.2.1.23.
  8053. - Fix two typos in tor_vasprintf() that broke the compile on Windows,
  8054. and a warning in or.h related to bandwidth_weight_rule_t that
  8055. prevented clean compile on OS X. Fixes bug 1363; bugfix on
  8056. 0.2.2.11-alpha.
  8057. - Fix a segfault on relays when DirReqStatistics is enabled
  8058. and 24 hours pass. Bug found by keb. Fixes bug 1365; bugfix on
  8059. 0.2.2.11-alpha.
  8060. o Minor bugfixes:
  8061. - Demote a confusing TLS warning that relay operators might get when
  8062. someone tries to talk to their OrPort. It is neither the operator's
  8063. fault nor can they do anything about it. Fixes bug 1364; bugfix
  8064. on 0.2.0.14-alpha.
  8065. Changes in version 0.2.2.11-alpha - 2010-04-15
  8066. Tor 0.2.2.11-alpha fixes yet another instance of broken OpenSSL
  8067. libraries that was causing some relays to drop out of the consensus.
  8068. o Major bugfixes:
  8069. - Directory mirrors were fetching relay descriptors only from v2
  8070. directory authorities, rather than v3 authorities like they should.
  8071. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  8072. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  8073. - Fix a parsing error that made every possible value of
  8074. CircPriorityHalflifeMsec get treated as "1 msec". Bugfix
  8075. on 0.2.2.7-alpha. Rename CircPriorityHalflifeMsec to
  8076. CircuitPriorityHalflifeMsec, so authorities can tell newer relays
  8077. about the option without breaking older ones.
  8078. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  8079. that claim to be earlier than 0.9.8m, but which have in reality
  8080. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  8081. behavior. Possible fix for some cases of bug 1346.
  8082. o Minor features:
  8083. - Experiment with a more aggressive approach to preventing clients
  8084. from making one-hop exit streams. Exit relays who want to try it
  8085. out can set "RefuseUnknownExits 1" in their torrc, and then look
  8086. for "Attempt by %s to open a stream" log messages. Let us know
  8087. how it goes!
  8088. - Add support for statically linking zlib by specifying
  8089. --enable-static-zlib, to go with our support for statically linking
  8090. openssl and libevent. Resolves bug 1358.
  8091. o Minor bugfixes:
  8092. - Fix a segfault that happens whenever a Tor client that is using
  8093. libevent2's bufferevents gets a hup signal. Bugfix on 0.2.2.5-alpha;
  8094. fixes bug 1341.
  8095. - When we cleaned up the contrib/tor-exit-notice.html file, we left
  8096. out the first line. Fixes bug 1295.
  8097. - When building the manpage from a tarball, we required asciidoc, but
  8098. the asciidoc -> roff/html conversion was already done for the
  8099. tarball. Make 'make' complain only when we need asciidoc (either
  8100. because we're compiling directly from git, or because we altered
  8101. the asciidoc manpage in the tarball). Bugfix on 0.2.2.9-alpha.
  8102. - When none of the directory authorities vote on any params, Tor
  8103. segfaulted when trying to make the consensus from the votes. We
  8104. didn't trigger the bug in practice, because authorities do include
  8105. params in their votes. Bugfix on 0.2.2.10-alpha; fixes bug 1322.
  8106. o Testsuite fixes:
  8107. - In the util/threads test, no longer free the test_mutex before all
  8108. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  8109. - The master thread could starve the worker threads quite badly on
  8110. certain systems, causing them to run only partially in the allowed
  8111. window. This resulted in test failures. Now the master thread sleeps
  8112. occasionally for a few microseconds while the two worker-threads
  8113. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  8114. Changes in version 0.2.2.10-alpha - 2010-03-07
  8115. Tor 0.2.2.10-alpha fixes a regression introduced in 0.2.2.9-alpha that
  8116. could prevent relays from guessing their IP address correctly. It also
  8117. starts the groundwork for another client-side performance boost, since
  8118. currently we're not making efficient use of relays that have both the
  8119. Guard flag and the Exit flag.
  8120. o Major bugfixes:
  8121. - Fix a regression from our patch for bug 1244 that caused relays
  8122. to guess their IP address incorrectly if they didn't set Address
  8123. in their torrc and/or their address fails to resolve. Bugfix on
  8124. 0.2.2.9-alpha; fixes bug 1269.
  8125. o Major features (performance):
  8126. - Directory authorities now compute consensus weightings that instruct
  8127. clients how to weight relays flagged as Guard, Exit, Guard+Exit,
  8128. and no flag. Clients that use these weightings will distribute
  8129. network load more evenly across these different relay types. The
  8130. weightings are in the consensus so we can change them globally in
  8131. the future. Extra thanks to "outofwords" for finding some nasty
  8132. security bugs in the first implementation of this feature.
  8133. o Minor features (performance):
  8134. - Always perform router selections using weighted relay bandwidth,
  8135. even if we don't need a high capacity circuit at the time. Non-fast
  8136. circuits now only differ from fast ones in that they can use relays
  8137. not marked with the Fast flag. This "feature" could turn out to
  8138. be a horrible bug; we should investigate more before it goes into
  8139. a stable release.
  8140. o Minor features:
  8141. - Allow disabling building of the manpages. Skipping the manpage
  8142. speeds up the build considerably.
  8143. o Minor bugfixes (on 0.2.2.x):
  8144. - Fix a memleak in the EXTENDCIRCUIT logic. Spotted by coverity.
  8145. Bugfix on 0.2.2.9-alpha.
  8146. - Disallow values larger than INT32_MAX for PerConnBWRate|Burst
  8147. config option. Bugfix on 0.2.2.7-alpha.
  8148. - Ship the asciidoc-helper file in the tarball, so that people can
  8149. build from source if they want to, and touching the .1.txt files
  8150. doesn't break the build. Bugfix on 0.2.2.9-alpha.
  8151. o Minor bugfixes (on 0.2.1.x or earlier):
  8152. - Fix a dereference-then-NULL-check sequence when publishing
  8153. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  8154. bug 1255.
  8155. - Fix another dereference-then-NULL-check sequence. Bugfix on
  8156. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  8157. - Make sure we treat potentially not NUL-terminated strings correctly.
  8158. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  8159. o Code simplifications and refactoring:
  8160. - Fix some urls in the exit notice file and make it XHTML1.1 strict
  8161. compliant. Based on a patch from Christian Kujau.
  8162. - Don't use sed in asciidoc-helper anymore.
  8163. - Make the build process fail if asciidoc cannot be found and
  8164. building with asciidoc isn't disabled.
  8165. Changes in version 0.2.2.9-alpha - 2010-02-22
  8166. Tor 0.2.2.9-alpha makes Tor work again on the latest OS X, updates the
  8167. location of a directory authority, and cleans up a bunch of small bugs.
  8168. o Directory authority changes:
  8169. - Change IP address for dannenberg (v3 directory authority), and
  8170. remove moria2 (obsolete v1, v2 directory authority and v0 hidden
  8171. service directory authority) from the list.
  8172. o Major bugfixes:
  8173. - Make Tor work again on the latest OS X: when deciding whether to
  8174. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  8175. version at run-time, not compile time. We need to do this because
  8176. Apple doesn't update its dev-tools headers when it updates its
  8177. libraries in a security patch.
  8178. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  8179. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  8180. a memory leak when requesting a hidden service descriptor we've
  8181. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  8182. by aakova.
  8183. - Authorities could be tricked into giving out the Exit flag to relays
  8184. that didn't allow exiting to any ports. This bug could screw
  8185. with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
  8186. 1238. Bug discovered by Martin Kowalczyk.
  8187. - When freeing a session key, zero it out completely. We only zeroed
  8188. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  8189. patched by ekir. Fixes bug 1254.
  8190. o Minor bugfixes:
  8191. - Fix static compilation by listing the openssl libraries in the right
  8192. order. Bugfix on Tor 0.2.2.8-alpha; fixes bug 1237.
  8193. - Resume handling .exit hostnames in a special way: originally we
  8194. stripped the .exit part and used the requested exit relay. In
  8195. 0.2.2.1-alpha we stopped treating them in any special way, meaning
  8196. if you use a .exit address then Tor will pass it on to the exit
  8197. relay. Now we reject the .exit stream outright, since that behavior
  8198. might be more expected by the user. Found and diagnosed by Scott
  8199. Bennett and Downie on or-talk.
  8200. - Don't spam the controller with events when we have no file
  8201. descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
  8202. for log messages was already solved from bug 748.)
  8203. - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
  8204. "memcpyfail".
  8205. - Make the DNSPort option work with libevent 2.x. Don't alter the
  8206. behaviour for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
  8207. - Emit a GUARD DROPPED controller event for a case we missed.
  8208. - Make more fields in the controller protocol case-insensitive, since
  8209. control-spec.txt said they were.
  8210. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  8211. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  8212. - Fix a spec conformance issue: the network-status-version token
  8213. must be the first token in a v3 consensus or vote. Discovered by
  8214. parakeep. Bugfix on 0.2.0.3-alpha.
  8215. o Code simplifications and refactoring:
  8216. - Generate our manpage and HTML documentation using Asciidoc. This
  8217. change should make it easier to maintain the documentation, and
  8218. produce nicer HTML.
  8219. - Remove the --enable-iphone option. According to reports from Marco
  8220. Bonetti, Tor builds fine without any special tweaking on recent
  8221. iPhone SDK versions.
  8222. - Removed some unnecessary files from the source distribution. The
  8223. AUTHORS file has now been merged into the people page on the
  8224. website. The roadmaps and design doc can now be found in the
  8225. projects directory in svn.
  8226. - Enabled various circuit build timeout constants to be controlled
  8227. by consensus parameters. Also set better defaults for these
  8228. parameters based on experimentation on broadband and simulated
  8229. high latency links.
  8230. o Minor features:
  8231. - The 'EXTENDCIRCUIT' control port command can now be used with
  8232. a circ id of 0 and no path. This feature will cause Tor to build
  8233. a new 'fast' general purpose circuit using its own path selection
  8234. algorithms.
  8235. - Added a BUILDTIMEOUT_SET controller event to describe changes
  8236. to the circuit build timeout.
  8237. - Future-proof the controller protocol a bit by ignoring keyword
  8238. arguments we do not recognize.
  8239. - Expand homedirs passed to tor-checkkey. This should silence a
  8240. coverity complaint about passing a user-supplied string into
  8241. open() without checking it.
  8242. Changes in version 0.2.1.25 - 2010-03-16
  8243. Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  8244. prevent relays from guessing their IP address correctly. It also fixes
  8245. several minor potential security bugs.
  8246. o Major bugfixes:
  8247. - Fix a regression from our patch for bug 1244 that caused relays
  8248. to guess their IP address incorrectly if they didn't set Address
  8249. in their torrc and/or their address fails to resolve. Bugfix on
  8250. 0.2.1.23; fixes bug 1269.
  8251. - When freeing a session key, zero it out completely. We only zeroed
  8252. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  8253. patched by ekir. Fixes bug 1254.
  8254. o Minor bugfixes:
  8255. - Fix a dereference-then-NULL-check sequence when publishing
  8256. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  8257. bug 1255.
  8258. - Fix another dereference-then-NULL-check sequence. Bugfix on
  8259. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  8260. - Make sure we treat potentially not NUL-terminated strings correctly.
  8261. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  8262. Changes in version 0.2.1.24 - 2010-02-21
  8263. Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  8264. for sure!
  8265. o Minor bugfixes:
  8266. - Work correctly out-of-the-box with even more vendor-patched versions
  8267. of OpenSSL. In particular, make it so Debian and OS X don't need
  8268. customized patches to run/build.
  8269. Changes in version 0.2.1.23 - 2010-02-13
  8270. Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  8271. again on the latest OS X, and updates the location of a directory
  8272. authority.
  8273. o Major bugfixes (performance):
  8274. - We were selecting our guards uniformly at random, and then weighting
  8275. which of our guards we'd use uniformly at random. This imbalance
  8276. meant that Tor clients were severely limited on throughput (and
  8277. probably latency too) by the first hop in their circuit. Now we
  8278. select guards weighted by currently advertised bandwidth. We also
  8279. automatically discard guards picked using the old algorithm. Fixes
  8280. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  8281. o Major bugfixes:
  8282. - Make Tor work again on the latest OS X: when deciding whether to
  8283. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  8284. version at run-time, not compile time. We need to do this because
  8285. Apple doesn't update its dev-tools headers when it updates its
  8286. libraries in a security patch.
  8287. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  8288. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  8289. a memory leak when requesting a hidden service descriptor we've
  8290. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  8291. by aakova.
  8292. o Directory authority changes:
  8293. - Change IP address for dannenberg (v3 directory authority), and
  8294. remove moria2 (obsolete v1, v2 directory authority and v0 hidden
  8295. service directory authority) from the list.
  8296. o Minor bugfixes:
  8297. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  8298. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  8299. o Minor features:
  8300. - Avoid a mad rush at the beginning of each month when each client
  8301. rotates half of its guards. Instead we spread the rotation out
  8302. throughout the month, but we still avoid leaving a precise timestamp
  8303. in the state file about when we first picked the guard. Improves
  8304. over the behavior introduced in 0.1.2.17.
  8305. Changes in version 0.2.2.8-alpha - 2010-01-26
  8306. Tor 0.2.2.8-alpha fixes a crash bug in 0.2.2.7-alpha that has been
  8307. causing bridge relays to disappear. If you're running a bridge,
  8308. please upgrade.
  8309. o Major bugfixes:
  8310. - Fix a memory corruption bug on bridges that occured during the
  8311. inclusion of stats data in extra-info descriptors. Also fix the
  8312. interface for geoip_get_bridge_stats* to prevent similar bugs in
  8313. the future. Diagnosis by Tas, patch by Karsten and Sebastian.
  8314. Fixes bug 1208; bugfix on 0.2.2.7-alpha.
  8315. o Minor bugfixes:
  8316. - Ignore OutboundBindAddress when connecting to localhost.
  8317. Connections to localhost need to come _from_ localhost, or else
  8318. local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
  8319. refuse to listen.
  8320. Changes in version 0.2.2.7-alpha - 2010-01-19
  8321. Tor 0.2.2.7-alpha fixes a huge client-side performance bug, as well
  8322. as laying the groundwork for further relay-side performance fixes. It
  8323. also starts cleaning up client behavior with respect to the EntryNodes,
  8324. ExitNodes, and StrictNodes config options.
  8325. This release also rotates two directory authority keys, due to a
  8326. security breach of some of the Torproject servers.
  8327. o Directory authority changes:
  8328. - Rotate keys (both v3 identity and relay identity) for moria1
  8329. and gabelmoo.
  8330. o Major features (performance):
  8331. - We were selecting our guards uniformly at random, and then weighting
  8332. which of our guards we'd use uniformly at random. This imbalance
  8333. meant that Tor clients were severely limited on throughput (and
  8334. probably latency too) by the first hop in their circuit. Now we
  8335. select guards weighted by currently advertised bandwidth. We also
  8336. automatically discard guards picked using the old algorithm. Fixes
  8337. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  8338. - When choosing which cells to relay first, relays can now favor
  8339. circuits that have been quiet recently, to provide lower latency
  8340. for low-volume circuits. By default, relays enable or disable this
  8341. feature based on a setting in the consensus. You can override
  8342. this default by using the new "CircuitPriorityHalflife" config
  8343. option. Design and code by Ian Goldberg, Can Tang, and Chris
  8344. Alexander.
  8345. - Add separate per-conn write limiting to go with the per-conn read
  8346. limiting. We added a global write limit in Tor 0.1.2.5-alpha,
  8347. but never per-conn write limits.
  8348. - New consensus params "bwconnrate" and "bwconnburst" to let us
  8349. rate-limit client connections as they enter the network. It's
  8350. controlled in the consensus so we can turn it on and off for
  8351. experiments. It's starting out off. Based on proposal 163.
  8352. o Major features (relay selection options):
  8353. - Switch to a StrictNodes config option, rather than the previous
  8354. "StrictEntryNodes" / "StrictExitNodes" separation that was missing a
  8355. "StrictExcludeNodes" option.
  8356. - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
  8357. change during a config reload, mark and discard all our origin
  8358. circuits. This fix should address edge cases where we change the
  8359. config options and but then choose a circuit that we created before
  8360. the change.
  8361. - If EntryNodes or ExitNodes are set, be more willing to use an
  8362. unsuitable (e.g. slow or unstable) circuit. The user asked for it,
  8363. they get it.
  8364. - Make EntryNodes config option much more aggressive even when
  8365. StrictNodes is not set. Before it would prepend your requested
  8366. entrynodes to your list of guard nodes, but feel free to use others
  8367. after that. Now it chooses only from your EntryNodes if any of
  8368. those are available, and only falls back to others if a) they're
  8369. all down and b) StrictNodes is not set.
  8370. - Now we refresh your entry guards from EntryNodes at each consensus
  8371. fetch -- rather than just at startup and then they slowly rot as
  8372. the network changes.
  8373. o Major bugfixes:
  8374. - Stop bridge directory authorities from answering dbg-stability.txt
  8375. directory queries, which would let people fetch a list of all
  8376. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  8377. o Minor features:
  8378. - Log a notice when we get a new control connection. Now it's easier
  8379. for security-conscious users to recognize when a local application
  8380. is knocking on their controller door. Suggested by bug 1196.
  8381. - New config option "CircuitStreamTimeout" to override our internal
  8382. timeout schedule for how many seconds until we detach a stream from
  8383. a circuit and try a new circuit. If your network is particularly
  8384. slow, you might want to set this to a number like 60.
  8385. - New controller command "getinfo config-text". It returns the
  8386. contents that Tor would write if you send it a SAVECONF command,
  8387. so the controller can write the file to disk itself.
  8388. - New options for SafeLogging to allow scrubbing only log messages
  8389. generated while acting as a relay.
  8390. - Ship the bridges spec file in the tarball too.
  8391. - Avoid a mad rush at the beginning of each month when each client
  8392. rotates half of its guards. Instead we spread the rotation out
  8393. throughout the month, but we still avoid leaving a precise timestamp
  8394. in the state file about when we first picked the guard. Improves
  8395. over the behavior introduced in 0.1.2.17.
  8396. o Minor bugfixes (compiling):
  8397. - Fix compilation on OS X 10.3, which has a stub mlockall() but
  8398. hides it. Bugfix on 0.2.2.6-alpha.
  8399. - Fix compilation on Solaris by removing support for the
  8400. DisableAllSwap config option. Solaris doesn't have an rlimit for
  8401. mlockall, so we cannot use it safely. Fixes bug 1198; bugfix on
  8402. 0.2.2.6-alpha.
  8403. o Minor bugfixes (crashes):
  8404. - Do not segfault when writing buffer stats when we haven't observed
  8405. a single circuit to report about. Found by Fabian Lanze. Bugfix on
  8406. 0.2.2.1-alpha.
  8407. - If we're in the pathological case where there's no exit bandwidth
  8408. but there is non-exit bandwidth, or no guard bandwidth but there
  8409. is non-guard bandwidth, don't crash during path selection. Bugfix
  8410. on 0.2.0.3-alpha.
  8411. - Fix an impossible-to-actually-trigger buffer overflow in relay
  8412. descriptor generation. Bugfix on 0.1.0.15.
  8413. o Minor bugfixes (privacy):
  8414. - Fix an instance where a Tor directory mirror might accidentally
  8415. log the IP address of a misbehaving Tor client. Bugfix on
  8416. 0.1.0.1-rc.
  8417. - Don't list Windows capabilities in relay descriptors. We never made
  8418. use of them, and maybe it's a bad idea to publish them. Bugfix
  8419. on 0.1.1.8-alpha.
  8420. o Minor bugfixes (other):
  8421. - Resolve an edge case in path weighting that could make us misweight
  8422. our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
  8423. - Fix statistics on client numbers by country as seen by bridges that
  8424. were broken in 0.2.2.1-alpha. Also switch to reporting full 24-hour
  8425. intervals instead of variable 12-to-48-hour intervals.
  8426. - After we free an internal connection structure, overwrite it
  8427. with a different memory value than we use for overwriting a freed
  8428. internal circuit structure. Should help with debugging. Suggested
  8429. by bug 1055.
  8430. - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
  8431. too.
  8432. o Removed features:
  8433. - Remove the HSAuthorityRecordStats option that version 0 hidden
  8434. service authorities could have used to track statistics of overall
  8435. hidden service usage.
  8436. Changes in version 0.2.1.22 - 2010-01-19
  8437. Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  8438. authorities -- it would tell you its whole history of bridge descriptors
  8439. if you make the right directory request. This stable update also
  8440. rotates two of the seven v3 directory authority keys and locations.
  8441. o Directory authority changes:
  8442. - Rotate keys (both v3 identity and relay identity) for moria1
  8443. and gabelmoo.
  8444. o Major bugfixes:
  8445. - Stop bridge directory authorities from answering dbg-stability.txt
  8446. directory queries, which would let people fetch a list of all
  8447. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  8448. Changes in version 0.2.1.21 - 2009-12-21
  8449. Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  8450. library. If you use Tor on Linux / Unix and you're getting SSL
  8451. renegotiation errors, upgrading should help. We also recommend an
  8452. upgrade if you're an exit relay.
  8453. o Major bugfixes:
  8454. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  8455. handshake from working unless we explicitly tell OpenSSL that we
  8456. are using SSL renegotiation safely. We are, of course, but OpenSSL
  8457. 0.9.8l won't work unless we say we are.
  8458. - Avoid crashing if the client is trying to upload many bytes and the
  8459. circuit gets torn down at the same time, or if the flip side
  8460. happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
  8461. o Minor bugfixes:
  8462. - Do not refuse to learn about authority certs and v2 networkstatus
  8463. documents that are older than the latest consensus. This bug might
  8464. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  8465. Spotted and fixed by xmux.
  8466. - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
  8467. trigger platform-specific option misparsing case found by Coverity
  8468. Scan.
  8469. - Fix a compilation warning on Fedora 12 by removing an impossible-to-
  8470. trigger assert. Fixes bug 1173.
  8471. Changes in version 0.2.2.6-alpha - 2009-11-19
  8472. Tor 0.2.2.6-alpha lays the groundwork for many upcoming features:
  8473. support for the new lower-footprint "microdescriptor" directory design,
  8474. future-proofing our consensus format against new hash functions or
  8475. other changes, and an Android port. It also makes Tor compatible with
  8476. the upcoming OpenSSL 0.9.8l release, and fixes a variety of bugs.
  8477. o Major features:
  8478. - Directory authorities can now create, vote on, and serve multiple
  8479. parallel formats of directory data as part of their voting process.
  8480. Partially implements Proposal 162: "Publish the consensus in
  8481. multiple flavors".
  8482. - Directory authorities can now agree on and publish small summaries
  8483. of router information that clients can use in place of regular
  8484. server descriptors. This transition will eventually allow clients
  8485. to use far less bandwidth for downloading information about the
  8486. network. Begins the implementation of Proposal 158: "Clients
  8487. download consensus + microdescriptors".
  8488. - The directory voting system is now extensible to use multiple hash
  8489. algorithms for signatures and resource selection. Newer formats
  8490. are signed with SHA256, with a possibility for moving to a better
  8491. hash algorithm in the future.
  8492. - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
  8493. current and future memory pages via mlockall(). On supported
  8494. platforms (modern Linux and probably BSD but not Windows or OS X),
  8495. this should effectively disable any and all attempts to page out
  8496. memory. This option requires that you start your Tor as root --
  8497. if you use DisableAllSwap, please consider using the User option
  8498. to properly reduce the privileges of your Tor.
  8499. - Numerous changes, bugfixes, and workarounds from Nathan Freitas
  8500. to help Tor build correctly for Android phones.
  8501. o Major bugfixes:
  8502. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  8503. handshake from working unless we explicitly tell OpenSSL that we
  8504. are using SSL renegotiation safely. We are, but OpenSSL 0.9.8l
  8505. won't work unless we say we are.
  8506. o Minor bugfixes:
  8507. - Fix a crash bug when trying to initialize the evdns module in
  8508. Libevent 2. Bugfix on 0.2.1.16-rc.
  8509. - Stop logging at severity 'warn' when some other Tor client tries
  8510. to establish a circuit with us using weak DH keys. It's a protocol
  8511. violation, but that doesn't mean ordinary users need to hear about
  8512. it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
  8513. - Do not refuse to learn about authority certs and v2 networkstatus
  8514. documents that are older than the latest consensus. This bug might
  8515. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  8516. Spotted and fixed by xmux.
  8517. - Fix numerous small code-flaws found by Coverity Scan Rung 3.
  8518. - If all authorities restart at once right before a consensus vote,
  8519. nobody will vote about "Running", and clients will get a consensus
  8520. with no usable relays. Instead, authorities refuse to build a
  8521. consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
  8522. - If your relay can't keep up with the number of incoming create
  8523. cells, it would log one warning per failure into your logs. Limit
  8524. warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
  8525. - Bridges now use "reject *:*" as their default exit policy. Bugfix
  8526. on 0.2.0.3-alpha; fixes bug 1113.
  8527. - Fix a memory leak on directory authorities during voting that was
  8528. introduced in 0.2.2.1-alpha. Found via valgrind.
  8529. Changes in version 0.2.1.20 - 2009-10-15
  8530. Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  8531. services at once, prepares for more performance improvements, and
  8532. fixes a bunch of smaller bugs.
  8533. The Windows and OS X bundles also include a more recent Vidalia,
  8534. and switch from Privoxy to Polipo.
  8535. The OS X installers are now drag and drop. It's best to un-install
  8536. Tor/Vidalia and then install this new bundle, rather than upgrade. If
  8537. you want to upgrade, you'll need to update the paths for Tor and Polipo
  8538. in the Vidalia Settings window.
  8539. o Major bugfixes:
  8540. - Send circuit or stream sendme cells when our window has decreased
  8541. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  8542. by Karsten when testing the "reduce circuit window" performance
  8543. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  8544. before the release of Tor 0.0.0. This is the new winner of the
  8545. oldest-bug prize.
  8546. - Fix a remotely triggerable memory leak when a consensus document
  8547. contains more than one signature from the same voter. Bugfix on
  8548. 0.2.0.3-alpha.
  8549. - Avoid segfault in rare cases when finishing an introduction circuit
  8550. as a client and finding out that we don't have an introduction key
  8551. for it. Fixes bug 1073. Reported by Aaron Swartz.
  8552. o Major features:
  8553. - Tor now reads the "circwindow" parameter out of the consensus,
  8554. and uses that value for its circuit package window rather than the
  8555. default of 1000 cells. Begins the implementation of proposal 168.
  8556. o New directory authorities:
  8557. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  8558. authority.
  8559. - Move moria1 and tonga to alternate IP addresses.
  8560. o Minor bugfixes:
  8561. - Fix a signed/unsigned compile warning in 0.2.1.19.
  8562. - Fix possible segmentation fault on directory authorities. Bugfix on
  8563. 0.2.1.14-rc.
  8564. - Fix an extremely rare infinite recursion bug that could occur if
  8565. we tried to log a message after shutting down the log subsystem.
  8566. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  8567. - Fix an obscure bug where hidden services on 64-bit big-endian
  8568. systems might mis-read the timestamp in v3 introduce cells, and
  8569. refuse to connect back to the client. Discovered by "rotor".
  8570. Bugfix on 0.2.1.6-alpha.
  8571. - We were triggering a CLOCK_SKEW controller status event whenever
  8572. we connect via the v2 connection protocol to any relay that has
  8573. a wrong clock. Instead, we should only inform the controller when
  8574. it's a trusted authority that claims our clock is wrong. Bugfix
  8575. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  8576. - We were telling the controller about CHECKING_REACHABILITY and
  8577. REACHABILITY_FAILED status events whenever we launch a testing
  8578. circuit or notice that one has failed. Instead, only tell the
  8579. controller when we want to inform the user of overall success or
  8580. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  8581. by SwissTorExit.
  8582. - Don't warn when we're using a circuit that ends with a node
  8583. excluded in ExcludeExitNodes, but the circuit is not used to access
  8584. the outside world. This should help fix bug 1090. Bugfix on
  8585. 0.2.1.6-alpha.
  8586. - Work around a small memory leak in some versions of OpenSSL that
  8587. stopped the memory used by the hostname TLS extension from being
  8588. freed.
  8589. o Minor features:
  8590. - Add a "getinfo status/accepted-server-descriptor" controller
  8591. command, which is the recommended way for controllers to learn
  8592. whether our server descriptor has been successfully received by at
  8593. least on directory authority. Un-recommend good-server-descriptor
  8594. getinfo and status events until we have a better design for them.
  8595. Changes in version 0.2.2.5-alpha - 2009-10-11
  8596. Tor 0.2.2.5-alpha fixes a few compile problems in 0.2.2.4-alpha.
  8597. o Major bugfixes:
  8598. - Make the tarball compile again. Oops. Bugfix on 0.2.2.4-alpha.
  8599. o Directory authorities:
  8600. - Temporarily (just for this release) move dizum to an alternate
  8601. IP address.
  8602. Changes in version 0.2.2.4-alpha - 2009-10-10
  8603. Tor 0.2.2.4-alpha fixes more crash bugs in 0.2.2.2-alpha. It also
  8604. introduces a new unit test framework, shifts directry authority
  8605. addresses around to reduce the impact from recent blocking events,
  8606. and fixes a few smaller bugs.
  8607. o Major bugfixes:
  8608. - Fix several more asserts in the circuit_build_times code, for
  8609. example one that causes Tor to fail to start once we have
  8610. accumulated 5000 build times in the state file. Bugfixes on
  8611. 0.2.2.2-alpha; fixes bug 1108.
  8612. o New directory authorities:
  8613. - Move moria1 and Tonga to alternate IP addresses.
  8614. o Minor features:
  8615. - Log SSL state transitions at debug level during handshake, and
  8616. include SSL states in error messages. This may help debug future
  8617. SSL handshake issues.
  8618. - Add a new "Handshake" log domain for activities that happen
  8619. during the TLS handshake.
  8620. - Revert to the "June 3 2009" ip-to-country file. The September one
  8621. seems to have removed most US IP addresses.
  8622. - Directory authorities now reject Tor relays with versions less than
  8623. 0.1.2.14. This step cuts out four relays from the current network,
  8624. none of which are very big.
  8625. o Minor bugfixes:
  8626. - Fix a couple of smaller issues with gathering statistics. Bugfixes
  8627. on 0.2.2.1-alpha.
  8628. - Fix two memory leaks in the error case of
  8629. circuit_build_times_parse_state(). Bugfix on 0.2.2.2-alpha.
  8630. - Don't count one-hop circuits when we're estimating how long it
  8631. takes circuits to build on average. Otherwise we'll set our circuit
  8632. build timeout lower than we should. Bugfix on 0.2.2.2-alpha.
  8633. - Directory authorities no longer change their opinion of, or vote on,
  8634. whether a router is Running, unless they have themselves been
  8635. online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
  8636. Fixes bug 1023.
  8637. o Code simplifications and refactoring:
  8638. - Revise our unit tests to use the "tinytest" framework, so we
  8639. can run tests in their own processes, have smarter setup/teardown
  8640. code, and so on. The unit test code has moved to its own
  8641. subdirectory, and has been split into multiple modules.
  8642. Changes in version 0.2.2.3-alpha - 2009-09-23
  8643. Tor 0.2.2.3-alpha fixes a few crash bugs in 0.2.2.2-alpha.
  8644. o Major bugfixes:
  8645. - Fix an overzealous assert in our new circuit build timeout code.
  8646. Bugfix on 0.2.2.2-alpha; fixes bug 1103.
  8647. o Minor bugfixes:
  8648. - If the networkstatus consensus tells us that we should use a
  8649. negative circuit package window, ignore it. Otherwise we'll
  8650. believe it and then trigger an assert. Bugfix on 0.2.2.2-alpha.
  8651. Changes in version 0.2.2.2-alpha - 2009-09-21
  8652. Tor 0.2.2.2-alpha introduces our latest performance improvement for
  8653. clients: Tor tracks the average time it takes to build a circuit, and
  8654. avoids using circuits that take too long to build. For fast connections,
  8655. this feature can cut your expected latency in half. For slow or flaky
  8656. connections, it could ruin your Tor experience. Let us know if it does!
  8657. o Major features:
  8658. - Tor now tracks how long it takes to build client-side circuits
  8659. over time, and adapts its timeout to local network performance.
  8660. Since a circuit that takes a long time to build will also provide
  8661. bad performance, we get significant latency improvements by
  8662. discarding the slowest 20% of circuits. Specifically, Tor creates
  8663. circuits more aggressively than usual until it has enough data
  8664. points for a good timeout estimate. Implements proposal 151.
  8665. We are especially looking for reports (good and bad) from users with
  8666. both EDGE and broadband connections that can move from broadband
  8667. to EDGE and find out if the build-time data in the .tor/state gets
  8668. reset without loss of Tor usability. You should also see a notice
  8669. log message telling you that Tor has reset its timeout.
  8670. - Directory authorities can now vote on arbitary integer values as
  8671. part of the consensus process. This is designed to help set
  8672. network-wide parameters. Implements proposal 167.
  8673. - Tor now reads the "circwindow" parameter out of the consensus,
  8674. and uses that value for its circuit package window rather than the
  8675. default of 1000 cells. Begins the implementation of proposal 168.
  8676. o Major bugfixes:
  8677. - Fix a remotely triggerable memory leak when a consensus document
  8678. contains more than one signature from the same voter. Bugfix on
  8679. 0.2.0.3-alpha.
  8680. o Minor bugfixes:
  8681. - Fix an extremely rare infinite recursion bug that could occur if
  8682. we tried to log a message after shutting down the log subsystem.
  8683. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  8684. - Fix parsing for memory or time units given without a space between
  8685. the number and the unit. Bugfix on 0.2.2.1-alpha; fixes bug 1076.
  8686. - A networkstatus vote must contain exactly one signature. Spec
  8687. conformance issue. Bugfix on 0.2.0.3-alpha.
  8688. - Fix an obscure bug where hidden services on 64-bit big-endian
  8689. systems might mis-read the timestamp in v3 introduce cells, and
  8690. refuse to connect back to the client. Discovered by "rotor".
  8691. Bugfix on 0.2.1.6-alpha.
  8692. - We were triggering a CLOCK_SKEW controller status event whenever
  8693. we connect via the v2 connection protocol to any relay that has
  8694. a wrong clock. Instead, we should only inform the controller when
  8695. it's a trusted authority that claims our clock is wrong. Bugfix
  8696. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  8697. - We were telling the controller about CHECKING_REACHABILITY and
  8698. REACHABILITY_FAILED status events whenever we launch a testing
  8699. circuit or notice that one has failed. Instead, only tell the
  8700. controller when we want to inform the user of overall success or
  8701. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  8702. by SwissTorExit.
  8703. - Don't warn when we're using a circuit that ends with a node
  8704. excluded in ExcludeExitNodes, but the circuit is not used to access
  8705. the outside world. This should help fix bug 1090, but more problems
  8706. remain. Bugfix on 0.2.1.6-alpha.
  8707. - Work around a small memory leak in some versions of OpenSSL that
  8708. stopped the memory used by the hostname TLS extension from being
  8709. freed.
  8710. - Make our 'torify' script more portable; if we have only one of
  8711. 'torsocks' or 'tsocks' installed, don't complain to the user;
  8712. and explain our warning about tsocks better.
  8713. o Minor features:
  8714. - Add a "getinfo status/accepted-server-descriptor" controller
  8715. command, which is the recommended way for controllers to learn
  8716. whether our server descriptor has been successfully received by at
  8717. least on directory authority. Un-recommend good-server-descriptor
  8718. getinfo and status events until we have a better design for them.
  8719. - Update to the "September 4 2009" ip-to-country file.
  8720. Changes in version 0.2.2.1-alpha - 2009-08-26
  8721. Tor 0.2.2.1-alpha disables ".exit" address notation by default, allows
  8722. Tor clients to bootstrap on networks where only port 80 is reachable,
  8723. makes it more straightforward to support hardware crypto accelerators,
  8724. and starts the groundwork for gathering stats safely at relays.
  8725. o Security fixes:
  8726. - Start the process of disabling ".exit" address notation, since it
  8727. can be used for a variety of esoteric application-level attacks
  8728. on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
  8729. on 0.0.9rc5.
  8730. o New directory authorities:
  8731. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  8732. authority.
  8733. o Major features:
  8734. - New AccelName and AccelDir options add support for dynamic OpenSSL
  8735. hardware crypto acceleration engines.
  8736. - Tor now supports tunneling all of its outgoing connections over
  8737. a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
  8738. configuration options. Code by Christopher Davis.
  8739. o Major bugfixes:
  8740. - Send circuit or stream sendme cells when our window has decreased
  8741. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  8742. by Karsten when testing the "reduce circuit window" performance
  8743. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  8744. before the release of Tor 0.0.0. This is the new winner of the
  8745. oldest-bug prize.
  8746. o New options for gathering stats safely:
  8747. - Directory mirrors that set "DirReqStatistics 1" write statistics
  8748. about directory requests to disk every 24 hours. As compared to the
  8749. --enable-geoip-stats flag in 0.2.1.x, there are a few improvements:
  8750. 1) stats are written to disk exactly every 24 hours; 2) estimated
  8751. shares of v2 and v3 requests are determined as mean values, not at
  8752. the end of a measurement period; 3) unresolved requests are listed
  8753. with country code '??'; 4) directories also measure download times.
  8754. - Exit nodes that set "ExitPortStatistics 1" write statistics on the
  8755. number of exit streams and transferred bytes per port to disk every
  8756. 24 hours.
  8757. - Relays that set "CellStatistics 1" write statistics on how long
  8758. cells spend in their circuit queues to disk every 24 hours.
  8759. - Entry nodes that set "EntryStatistics 1" write statistics on the
  8760. rough number and origins of connecting clients to disk every 24
  8761. hours.
  8762. - Relays that write any of the above statistics to disk and set
  8763. "ExtraInfoStatistics 1" include the past 24 hours of statistics in
  8764. their extra-info documents.
  8765. o Minor features:
  8766. - New --digests command-line switch to output the digests of the
  8767. source files Tor was built with.
  8768. - The "torify" script now uses torsocks where available.
  8769. - The memarea code now uses a sentinel value at the end of each area
  8770. to make sure nothing writes beyond the end of an area. This might
  8771. help debug some conceivable causes of bug 930.
  8772. - Time and memory units in the configuration file can now be set to
  8773. fractional units. For example, "2.5 GB" is now a valid value for
  8774. AccountingMax.
  8775. - Certain Tor clients (such as those behind check.torproject.org) may
  8776. want to fetch the consensus in an extra early manner. To enable this
  8777. a user may now set FetchDirInfoExtraEarly to 1. This also depends on
  8778. setting FetchDirInfoEarly to 1. Previous behavior will stay the same
  8779. as only certain clients who must have this information sooner should
  8780. set this option.
  8781. - Instead of adding the svn revision to the Tor version string, report
  8782. the git commit (when we're building from a git checkout).
  8783. o Minor bugfixes:
  8784. - If any of the v3 certs we download are unparseable, we should
  8785. actually notice the failure so we don't retry indefinitely. Bugfix
  8786. on 0.2.0.x; reported by "rotator".
  8787. - If the cached cert file is unparseable, warn but don't exit.
  8788. - Fix possible segmentation fault on directory authorities. Bugfix on
  8789. 0.2.1.14-rc.
  8790. - When Tor fails to parse a descriptor of any kind, dump it to disk.
  8791. Might help diagnosing bug 1051.
  8792. o Deprecated and removed features:
  8793. - The controller no longer accepts the old obsolete "addr-mappings/"
  8794. or "unregistered-servers-" GETINFO values.
  8795. - Hidden services no longer publish version 0 descriptors, and clients
  8796. do not request or use version 0 descriptors. However, the old hidden
  8797. service authorities still accept and serve version 0 descriptors
  8798. when contacted by older hidden services/clients.
  8799. - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
  8800. always on; using them is necessary for correct forward-compatible
  8801. controllers.
  8802. - Remove support for .noconnect style addresses. Nobody was using
  8803. them, and they provided another avenue for detecting Tor users
  8804. via application-level web tricks.
  8805. o Packaging changes:
  8806. - Upgrade Vidalia from 0.1.15 to 0.2.3 in the Windows and OS X
  8807. installer bundles. See
  8808. https://trac.vidalia-project.net/browser/vidalia/tags/vidalia-0.2.3/CHANGELOG
  8809. for details of what's new in Vidalia 0.2.3.
  8810. - Windows Vidalia Bundle: update Privoxy from 3.0.6 to 3.0.14-beta.
  8811. - OS X Vidalia Bundle: move to Polipo 1.0.4 with Tor specific
  8812. configuration file, rather than the old Privoxy.
  8813. - OS X Vidalia Bundle: Vidalia, Tor, and Polipo are compiled as
  8814. x86-only for better compatibility with OS X 10.6, aka Snow Leopard.
  8815. - OS X Tor Expert Bundle: Tor is compiled as x86-only for
  8816. better compatibility with OS X 10.6, aka Snow Leopard.
  8817. - OS X Vidalia Bundle: The multi-package installer is now replaced
  8818. by a simple drag and drop to the /Applications folder. This change
  8819. occurred with the upgrade to Vidalia 0.2.3.
  8820. Changes in version 0.2.1.19 - 2009-07-28
  8821. Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  8822. services on Tor 0.2.1.3-alpha through 0.2.1.18.
  8823. o Major bugfixes:
  8824. - Make accessing hidden services on 0.2.1.x work right again.
  8825. Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
  8826. part of patch provided by "optimist".
  8827. o Minor features:
  8828. - When a relay/bridge is writing out its identity key fingerprint to
  8829. the "fingerprint" file and to its logs, write it without spaces. Now
  8830. it will look like the fingerprints in our bridges documentation,
  8831. and confuse fewer users.
  8832. o Minor bugfixes:
  8833. - Relays no longer publish a new server descriptor if they change
  8834. their MaxAdvertisedBandwidth config option but it doesn't end up
  8835. changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
  8836. fixes bug 1026. Patch from Sebastian.
  8837. - Avoid leaking memory every time we get a create cell but we have
  8838. so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
  8839. fixes bug 1034. Reported by BarkerJr.
  8840. Changes in version 0.2.1.18 - 2009-07-24
  8841. Tor 0.2.1.18 lays the foundations for performance improvements,
  8842. adds status events to help users diagnose bootstrap problems, adds
  8843. optional authentication/authorization for hidden services, fixes a
  8844. variety of potential anonymity problems, and includes a huge pile of
  8845. other features and bug fixes.
  8846. o Build fixes:
  8847. - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
  8848. Changes in version 0.2.1.17-rc - 2009-07-07
  8849. Tor 0.2.1.17-rc marks the fourth -- and hopefully last -- release
  8850. candidate for the 0.2.1.x series. It lays the groundwork for further
  8851. client performance improvements, and also fixes a big bug with directory
  8852. authorities that were causing them to assign Guard and Stable flags
  8853. poorly.
  8854. The Windows bundles also finally include the geoip database that we
  8855. thought we'd been shipping since 0.2.0.x (oops), and the OS X bundles
  8856. should actually install Torbutton rather than giving you a cryptic
  8857. failure message (oops).
  8858. o Major features:
  8859. - Clients now use the bandwidth values in the consensus, rather than
  8860. the bandwidth values in each relay descriptor. This approach opens
  8861. the door to more accurate bandwidth estimates once the directory
  8862. authorities start doing active measurements. Implements more of
  8863. proposal 141.
  8864. o Major bugfixes:
  8865. - When Tor clients restart after 1-5 days, they discard all their
  8866. cached descriptors as too old, but they still use the cached
  8867. consensus document. This approach is good for robustness, but
  8868. bad for performance: since they don't know any bandwidths, they
  8869. end up choosing at random rather than weighting their choice by
  8870. speed. Fixed by the above feature of putting bandwidths in the
  8871. consensus. Bugfix on 0.2.0.x.
  8872. - Directory authorities were neglecting to mark relays down in their
  8873. internal histories if the relays fall off the routerlist without
  8874. ever being found unreachable. So there were relays in the histories
  8875. that haven't been seen for eight months, and are listed as being
  8876. up for eight months. This wreaked havoc on the "median wfu"
  8877. and "median mtbf" calculations, in turn making Guard and Stable
  8878. flags very wrong, hurting network performance. Fixes bugs 696 and
  8879. 969. Bugfix on 0.2.0.6-alpha.
  8880. o Minor bugfixes:
  8881. - Serve the DirPortFrontPage page even when we have been approaching
  8882. our quotas recently. Fixes bug 1013; bugfix on 0.2.1.8-alpha.
  8883. - The control port would close the connection before flushing long
  8884. replies, such as the network consensus, if a QUIT command was issued
  8885. before the reply had completed. Now, the control port flushes all
  8886. pending replies before closing the connection. Also fixed a spurious
  8887. warning when a QUIT command is issued after a malformed or rejected
  8888. AUTHENTICATE command, but before the connection was closed. Patch
  8889. by Marcus Griep. Bugfix on 0.2.0.x; fixes bugs 1015 and 1016.
  8890. - When we can't find an intro key for a v2 hidden service descriptor,
  8891. fall back to the v0 hidden service descriptor and log a bug message.
  8892. Workaround for bug 1024.
  8893. - Fix a log message that did not respect the SafeLogging option.
  8894. Resolves bug 1027.
  8895. o Minor features:
  8896. - If we're a relay and we change our IP address, be more verbose
  8897. about the reason that made us change. Should help track down
  8898. further bugs for relays on dynamic IP addresses.
  8899. Changes in version 0.2.0.35 - 2009-06-24
  8900. o Security fix:
  8901. - Avoid crashing in the presence of certain malformed descriptors.
  8902. Found by lark, and by automated fuzzing.
  8903. - Fix an edge case where a malicious exit relay could convince a
  8904. controller that the client's DNS question resolves to an internal IP
  8905. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  8906. o Major bugfixes:
  8907. - Finally fix the bug where dynamic-IP relays disappear when their
  8908. IP address changes: directory mirrors were mistakenly telling
  8909. them their old address if they asked via begin_dir, so they
  8910. never got an accurate answer about their new address, so they
  8911. just vanished after a day. For belt-and-suspenders, relays that
  8912. don't set Address in their config now avoid using begin_dir for
  8913. all direct connections. Should fix bugs 827, 883, and 900.
  8914. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  8915. that would occur on some exit nodes when DNS failures and timeouts
  8916. occurred in certain patterns. Fix for bug 957.
  8917. o Minor bugfixes:
  8918. - When starting with a cache over a few days old, do not leak
  8919. memory for the obsolete router descriptors in it. Bugfix on
  8920. 0.2.0.33; fixes bug 672.
  8921. - Hidden service clients didn't use a cached service descriptor that
  8922. was older than 15 minutes, but wouldn't fetch a new one either,
  8923. because there was already one in the cache. Now, fetch a v2
  8924. descriptor unless the same descriptor was added to the cache within
  8925. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  8926. Changes in version 0.2.1.16-rc - 2009-06-20
  8927. Tor 0.2.1.16-rc speeds up performance for fast exit relays, and fixes
  8928. a bunch of minor bugs.
  8929. o Security fixes:
  8930. - Fix an edge case where a malicious exit relay could convince a
  8931. controller that the client's DNS question resolves to an internal IP
  8932. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  8933. o Major performance improvements (on 0.2.0.x):
  8934. - Disable and refactor some debugging checks that forced a linear scan
  8935. over the whole server-side DNS cache. These accounted for over 50%
  8936. of CPU time on a relatively busy exit node's gprof profile. Found
  8937. by Jacob.
  8938. - Disable some debugging checks that appeared in exit node profile
  8939. data.
  8940. o Minor features:
  8941. - Update to the "June 3 2009" ip-to-country file.
  8942. - Do not have tor-resolve automatically refuse all .onion addresses;
  8943. if AutomapHostsOnResolve is set in your torrc, this will work fine.
  8944. o Minor bugfixes (on 0.2.0.x):
  8945. - Log correct error messages for DNS-related network errors on
  8946. Windows.
  8947. - Fix a race condition that could cause crashes or memory corruption
  8948. when running as a server with a controller listening for log
  8949. messages.
  8950. - Avoid crashing when we have a policy specified in a DirPolicy or
  8951. SocksPolicy or ReachableAddresses option with ports set on it,
  8952. and we re-load the policy. May fix bug 996.
  8953. - Hidden service clients didn't use a cached service descriptor that
  8954. was older than 15 minutes, but wouldn't fetch a new one either,
  8955. because there was already one in the cache. Now, fetch a v2
  8956. descriptor unless the same descriptor was added to the cache within
  8957. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  8958. o Minor bugfixes (on 0.2.1.x):
  8959. - Don't warn users about low port and hibernation mix when they
  8960. provide a *ListenAddress directive to fix that. Bugfix on
  8961. 0.2.1.15-rc.
  8962. - When switching back and forth between bridge mode, do not start
  8963. gathering GeoIP data until two hours have passed.
  8964. - Do not complain that the user has requested an excluded node as
  8965. an exit when the node is not really an exit. This could happen
  8966. because the circuit was for testing, or an introduction point.
  8967. Fix for bug 984.
  8968. Changes in version 0.2.1.15-rc - 2009-05-25
  8969. Tor 0.2.1.15-rc marks the second release candidate for the 0.2.1.x
  8970. series. It fixes a major bug on fast exit relays, as well as a variety
  8971. of more minor bugs.
  8972. o Major bugfixes (on 0.2.0.x):
  8973. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  8974. that would occur on some exit nodes when DNS failures and timeouts
  8975. occurred in certain patterns. Fix for bug 957.
  8976. o Minor bugfixes (on 0.2.0.x):
  8977. - Actually return -1 in the error case for read_bandwidth_usage().
  8978. Harmless bug, since we currently don't care about the return value
  8979. anywhere. Bugfix on 0.2.0.9-alpha.
  8980. - Provide a more useful log message if bug 977 (related to buffer
  8981. freelists) ever reappears, and do not crash right away.
  8982. - Fix an assertion failure on 64-bit platforms when we allocated
  8983. memory right up to the end of a memarea, then realigned the memory
  8984. one step beyond the end. Fixes a possible cause of bug 930.
  8985. - Protect the count of open sockets with a mutex, so we can't
  8986. corrupt it when two threads are closing or opening sockets at once.
  8987. Fix for bug 939. Bugfix on 0.2.0.1-alpha.
  8988. - Don't allow a bridge to publish its router descriptor to a
  8989. non-bridge directory authority. Fixes part of bug 932.
  8990. - When we change to or from being a bridge, reset our counts of
  8991. client usage by country. Fixes bug 932.
  8992. - Fix a bug that made stream bandwidth get misreported to the
  8993. controller.
  8994. - Stop using malloc_usable_size() to use more area than we had
  8995. actually allocated: it was safe, but made valgrind really unhappy.
  8996. - Fix a memory leak when v3 directory authorities load their keys
  8997. and cert from disk. Bugfix on 0.2.0.1-alpha.
  8998. o Minor bugfixes (on 0.2.1.x):
  8999. - Fix use of freed memory when deciding to mark a non-addable
  9000. descriptor as never-downloadable. Bugfix on 0.2.1.9-alpha.
  9001. Changes in version 0.2.1.14-rc - 2009-04-12
  9002. Tor 0.2.1.14-rc marks the first release candidate for the 0.2.1.x
  9003. series. It begins fixing some major performance problems, and also
  9004. finally addresses the bug that was causing relays on dynamic IP
  9005. addresses to fall out of the directory.
  9006. o Major features:
  9007. - Clients replace entry guards that were chosen more than a few months
  9008. ago. This change should significantly improve client performance,
  9009. especially once more people upgrade, since relays that have been
  9010. a guard for a long time are currently overloaded.
  9011. o Major bugfixes (on 0.2.0):
  9012. - Finally fix the bug where dynamic-IP relays disappear when their
  9013. IP address changes: directory mirrors were mistakenly telling
  9014. them their old address if they asked via begin_dir, so they
  9015. never got an accurate answer about their new address, so they
  9016. just vanished after a day. For belt-and-suspenders, relays that
  9017. don't set Address in their config now avoid using begin_dir for
  9018. all direct connections. Should fix bugs 827, 883, and 900.
  9019. - Relays were falling out of the networkstatus consensus for
  9020. part of a day if they changed their local config but the
  9021. authorities discarded their new descriptor as "not sufficiently
  9022. different". Now directory authorities accept a descriptor as changed
  9023. if bandwidthrate or bandwidthburst changed. Partial fix for bug 962;
  9024. patch by Sebastian.
  9025. - Avoid crashing in the presence of certain malformed descriptors.
  9026. Found by lark, and by automated fuzzing.
  9027. o Minor features:
  9028. - When generating circuit events with verbose nicknames for
  9029. controllers, try harder to look up nicknames for routers on a
  9030. circuit. (Previously, we would look in the router descriptors we had
  9031. for nicknames, but not in the consensus.) Partial fix for bug 941.
  9032. - If the bridge config line doesn't specify a port, assume 443.
  9033. This makes bridge lines a bit smaller and easier for users to
  9034. understand.
  9035. - Raise the minimum bandwidth to be a relay from 20000 bytes to 20480
  9036. bytes (aka 20KB/s), to match our documentation. Also update
  9037. directory authorities so they always assign the Fast flag to relays
  9038. with 20KB/s of capacity. Now people running relays won't suddenly
  9039. find themselves not seeing any use, if the network gets faster
  9040. on average.
  9041. - Update to the "April 3 2009" ip-to-country file.
  9042. o Minor bugfixes:
  9043. - Avoid trying to print raw memory to the logs when we decide to
  9044. give up on downloading a given relay descriptor. Bugfix on
  9045. 0.2.1.9-alpha.
  9046. - In tor-resolve, when the Tor client to use is specified by
  9047. <hostname>:<port>, actually use the specified port rather than
  9048. defaulting to 9050. Bugfix on 0.2.1.6-alpha.
  9049. - Make directory usage recording work again. Bugfix on 0.2.1.6-alpha.
  9050. - When starting with a cache over a few days old, do not leak
  9051. memory for the obsolete router descriptors in it. Bugfix on
  9052. 0.2.0.33.
  9053. - Avoid double-free on list of successfully uploaded hidden
  9054. service discriptors. Fix for bug 948. Bugfix on 0.2.1.6-alpha.
  9055. - Change memarea_strndup() implementation to work even when
  9056. duplicating a string at the end of a page. This bug was
  9057. harmless for now, but could have meant crashes later. Fix by
  9058. lark. Bugfix on 0.2.1.1-alpha.
  9059. - Limit uploaded directory documents to be 16M rather than 500K.
  9060. The directory authorities were refusing v3 consensus votes from
  9061. other authorities, since the votes are now 504K. Fixes bug 959;
  9062. bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
  9063. - Directory authorities should never send a 503 "busy" response to
  9064. requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
  9065. bug 959.
  9066. Changes in version 0.2.1.13-alpha - 2009-03-09
  9067. Tor 0.2.1.13-alpha includes another big pile of minor bugfixes and
  9068. cleanups. We're finally getting close to a release candidate.
  9069. o Major bugfixes:
  9070. - Correctly update the list of which countries we exclude as
  9071. exits, when the GeoIP file is loaded or reloaded. Diagnosed by
  9072. lark. Bugfix on 0.2.1.6-alpha.
  9073. o Minor bugfixes (on 0.2.0.x and earlier):
  9074. - Automatically detect MacOSX versions earlier than 10.4.0, and
  9075. disable kqueue from inside Tor when running with these versions.
  9076. We previously did this from the startup script, but that was no
  9077. help to people who didn't use the startup script. Resolves bug 863.
  9078. - When we had picked an exit node for a connection, but marked it as
  9079. "optional", and it turned out we had no onion key for the exit,
  9080. stop wanting that exit and try again. This situation may not
  9081. be possible now, but will probably become feasible with proposal
  9082. 158. Spotted by rovv. Fixes another case of bug 752.
  9083. - Clients no longer cache certificates for authorities they do not
  9084. recognize. Bugfix on 0.2.0.9-alpha.
  9085. - When we can't transmit a DNS request due to a network error, retry
  9086. it after a while, and eventually transmit a failing response to
  9087. the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
  9088. - If the controller claimed responsibility for a stream, but that
  9089. stream never finished making its connection, it would live
  9090. forever in circuit_wait state. Now we close it after SocksTimeout
  9091. seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
  9092. - Drop begin cells to a hidden service if they come from the middle
  9093. of a circuit. Patch from lark.
  9094. - When we erroneously receive two EXTEND cells for the same circuit
  9095. ID on the same connection, drop the second. Patch from lark.
  9096. - Fix a crash that occurs on exit nodes when a nameserver request
  9097. timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
  9098. been suppressing the bug since 0.1.2.10-alpha. Partial fix for
  9099. bug 929.
  9100. - Do not assume that a stack-allocated character array will be
  9101. 64-bit aligned on platforms that demand that uint64_t access is
  9102. aligned. Possible fix for bug 604.
  9103. - Parse dates and IPv4 addresses in a locale- and libc-independent
  9104. manner, to avoid platform-dependent behavior on malformed input.
  9105. - Build correctly when configured to build outside the main source
  9106. path. Patch from Michael Gold.
  9107. - We were already rejecting relay begin cells with destination port
  9108. of 0. Now also reject extend cells with destination port or address
  9109. of 0. Suggested by lark.
  9110. o Minor bugfixes (on 0.2.1.x):
  9111. - Don't re-extend introduction circuits if we ran out of RELAY_EARLY
  9112. cells. Bugfix on 0.2.1.3-alpha. Fixes more of bug 878.
  9113. - If we're an exit node, scrub the IP address to which we are exiting
  9114. in the logs. Bugfix on 0.2.1.8-alpha.
  9115. o Minor features:
  9116. - On Linux, use the prctl call to re-enable core dumps when the user
  9117. is option is set.
  9118. - New controller event NEWCONSENSUS that lists the networkstatus
  9119. lines for every recommended relay. Now controllers like Torflow
  9120. can keep up-to-date on which relays they should be using.
  9121. - Update to the "February 26 2009" ip-to-country file.
  9122. Changes in version 0.2.0.34 - 2009-02-08
  9123. Tor 0.2.0.34 features several more security-related fixes. You should
  9124. upgrade, especially if you run an exit relay (remote crash) or a
  9125. directory authority (remote infinite loop), or you're on an older
  9126. (pre-XP) or not-recently-patched Windows (remote exploit).
  9127. This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  9128. have many known flaws, and nobody should be using them. You should
  9129. upgrade. If you're using a Linux or BSD and its packages are obsolete,
  9130. stop using those packages and upgrade anyway.
  9131. o Security fixes:
  9132. - Fix an infinite-loop bug on handling corrupt votes under certain
  9133. circumstances. Bugfix on 0.2.0.8-alpha.
  9134. - Fix a temporary DoS vulnerability that could be performed by
  9135. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  9136. - Avoid a potential crash on exit nodes when processing malformed
  9137. input. Remote DoS opportunity. Bugfix on 0.2.0.33.
  9138. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  9139. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  9140. o Minor bugfixes:
  9141. - Fix compilation on systems where time_t is a 64-bit integer.
  9142. Patch from Matthias Drochner.
  9143. - Don't consider expiring already-closed client connections. Fixes
  9144. bug 893. Bugfix on 0.0.2pre20.
  9145. Changes in version 0.2.1.12-alpha - 2009-02-08
  9146. Tor 0.2.1.12-alpha features several more security-related fixes. You
  9147. should upgrade, especially if you run an exit relay (remote crash) or
  9148. a directory authority (remote infinite loop), or you're on an older
  9149. (pre-XP) or not-recently-patched Windows (remote exploit). It also
  9150. includes a big pile of minor bugfixes and cleanups.
  9151. o Security fixes:
  9152. - Fix an infinite-loop bug on handling corrupt votes under certain
  9153. circumstances. Bugfix on 0.2.0.8-alpha.
  9154. - Fix a temporary DoS vulnerability that could be performed by
  9155. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  9156. - Avoid a potential crash on exit nodes when processing malformed
  9157. input. Remote DoS opportunity. Bugfix on 0.2.1.7-alpha.
  9158. o Minor bugfixes:
  9159. - Let controllers actually ask for the "clients_seen" event for
  9160. getting usage summaries on bridge relays. Bugfix on 0.2.1.10-alpha;
  9161. reported by Matt Edman.
  9162. - Fix a compile warning on OSX Panther. Fixes bug 913; bugfix against
  9163. 0.2.1.11-alpha.
  9164. - Fix a bug in address parsing that was preventing bridges or hidden
  9165. service targets from being at IPv6 addresses.
  9166. - Solve a bug that kept hardware crypto acceleration from getting
  9167. enabled when accounting was turned on. Fixes bug 907. Bugfix on
  9168. 0.0.9pre6.
  9169. - Remove a bash-ism from configure.in to build properly on non-Linux
  9170. platforms. Bugfix on 0.2.1.1-alpha.
  9171. - Fix code so authorities _actually_ send back X-Descriptor-Not-New
  9172. headers. Bugfix on 0.2.0.10-alpha.
  9173. - Don't consider expiring already-closed client connections. Fixes
  9174. bug 893. Bugfix on 0.0.2pre20.
  9175. - Fix another interesting corner-case of bug 891 spotted by rovv:
  9176. Previously, if two hosts had different amounts of clock drift, and
  9177. one of them created a new connection with just the wrong timing,
  9178. the other might decide to deprecate the new connection erroneously.
  9179. Bugfix on 0.1.1.13-alpha.
  9180. - Resolve a very rare crash bug that could occur when the user forced
  9181. a nameserver reconfiguration during the middle of a nameserver
  9182. probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
  9183. - Support changing value of ServerDNSRandomizeCase during SIGHUP.
  9184. Bugfix on 0.2.1.7-alpha.
  9185. - If we're using bridges and our network goes away, be more willing
  9186. to forgive our bridges and try again when we get an application
  9187. request. Bugfix on 0.2.0.x.
  9188. o Minor features:
  9189. - Support platforms where time_t is 64 bits long. (Congratulations,
  9190. NetBSD!) Patch from Matthias Drochner.
  9191. - Add a 'getinfo status/clients-seen' controller command, in case
  9192. controllers want to hear clients_seen events but connect late.
  9193. o Build changes:
  9194. - Disable GCC's strict alias optimization by default, to avoid the
  9195. likelihood of its introducing subtle bugs whenever our code violates
  9196. the letter of C99's alias rules.
  9197. Changes in version 0.2.0.33 - 2009-01-21
  9198. Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  9199. useful to users. It also finally fixes a bug where a relay or client
  9200. that's been off for many days would take a long time to bootstrap.
  9201. This update also fixes an important security-related bug reported by
  9202. Ilja van Sprundel. You should upgrade. (We'll send out more details
  9203. about the bug once people have had some time to upgrade.)
  9204. o Security fixes:
  9205. - Fix a heap-corruption bug that may be remotely triggerable on
  9206. some platforms. Reported by Ilja van Sprundel.
  9207. o Major bugfixes:
  9208. - When a stream at an exit relay is in state "resolving" or
  9209. "connecting" and it receives an "end" relay cell, the exit relay
  9210. would silently ignore the end cell and not close the stream. If
  9211. the client never closes the circuit, then the exit relay never
  9212. closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
  9213. reported by "wood".
  9214. - When sending CREATED cells back for a given circuit, use a 64-bit
  9215. connection ID to find the right connection, rather than an addr:port
  9216. combination. Now that we can have multiple OR connections between
  9217. the same ORs, it is no longer possible to use addr:port to uniquely
  9218. identify a connection.
  9219. - Bridge relays that had DirPort set to 0 would stop fetching
  9220. descriptors shortly after startup, and then briefly resume
  9221. after a new bandwidth test and/or after publishing a new bridge
  9222. descriptor. Bridge users that try to bootstrap from them would
  9223. get a recent networkstatus but would get descriptors from up to
  9224. 18 hours earlier, meaning most of the descriptors were obsolete
  9225. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  9226. - Prevent bridge relays from serving their 'extrainfo' document
  9227. to anybody who asks, now that extrainfo docs include potentially
  9228. sensitive aggregated client geoip summaries. Bugfix on
  9229. 0.2.0.13-alpha.
  9230. - If the cached networkstatus consensus is more than five days old,
  9231. discard it rather than trying to use it. In theory it could be
  9232. useful because it lists alternate directory mirrors, but in practice
  9233. it just means we spend many minutes trying directory mirrors that
  9234. are long gone from the network. Also discard router descriptors as
  9235. we load them if they are more than five days old, since the onion
  9236. key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
  9237. o Minor bugfixes:
  9238. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  9239. could make gcc generate non-functional binary search code. Bugfix
  9240. on 0.2.0.10-alpha.
  9241. - Build correctly on platforms without socklen_t.
  9242. - Compile without warnings on solaris.
  9243. - Avoid potential crash on internal error during signature collection.
  9244. Fixes bug 864. Patch from rovv.
  9245. - Correct handling of possible malformed authority signing key
  9246. certificates with internal signature types. Fixes bug 880.
  9247. Bugfix on 0.2.0.3-alpha.
  9248. - Fix a hard-to-trigger resource leak when logging credential status.
  9249. CID 349.
  9250. - When we can't initialize DNS because the network is down, do not
  9251. automatically stop Tor from starting. Instead, we retry failed
  9252. dns_init() every 10 minutes, and change the exit policy to reject
  9253. *:* until one succeeds. Fixes bug 691.
  9254. - Use 64 bits instead of 32 bits for connection identifiers used with
  9255. the controller protocol, to greatly reduce risk of identifier reuse.
  9256. - When we're choosing an exit node for a circuit, and we have
  9257. no pending streams, choose a good general exit rather than one that
  9258. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  9259. - Fix another case of assuming, when a specific exit is requested,
  9260. that we know more than the user about what hosts it allows.
  9261. Fixes one case of bug 752. Patch from rovv.
  9262. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  9263. seconds. Warn the user if lower values are given in the
  9264. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  9265. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  9266. user if lower values are given in the configuration. Bugfix on
  9267. 0.1.1.17-rc. Patch by Sebastian.
  9268. - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
  9269. the cache because we already had a v0 descriptor with the same ID.
  9270. Bugfix on 0.2.0.18-alpha.
  9271. - Fix a race condition when freeing keys shared between main thread
  9272. and CPU workers that could result in a memory leak. Bugfix on
  9273. 0.1.0.1-rc. Fixes bug 889.
  9274. - Send a valid END cell back when a client tries to connect to a
  9275. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  9276. 840. Patch from rovv.
  9277. - Check which hops rendezvous stream cells are associated with to
  9278. prevent possible guess-the-streamid injection attacks from
  9279. intermediate hops. Fixes another case of bug 446. Based on patch
  9280. from rovv.
  9281. - If a broken client asks a non-exit router to connect somewhere,
  9282. do not even do the DNS lookup before rejecting the connection.
  9283. Fixes another case of bug 619. Patch from rovv.
  9284. - When a relay gets a create cell it can't decrypt (e.g. because it's
  9285. using the wrong onion key), we were dropping it and letting the
  9286. client time out. Now actually answer with a destroy cell. Fixes
  9287. bug 904. Bugfix on 0.0.2pre8.
  9288. o Minor bugfixes (hidden services):
  9289. - Do not throw away existing introduction points on SIGHUP. Bugfix on
  9290. 0.0.6pre1. Patch by Karsten. Fixes bug 874.
  9291. o Minor features:
  9292. - Report the case where all signatures in a detached set are rejected
  9293. differently than the case where there is an error handling the
  9294. detached set.
  9295. - When we realize that another process has modified our cached
  9296. descriptors, print out a more useful error message rather than
  9297. triggering an assertion. Fixes bug 885. Patch from Karsten.
  9298. - Implement the 0x20 hack to better resist DNS poisoning: set the
  9299. case on outgoing DNS requests randomly, and reject responses that do
  9300. not match the case correctly. This logic can be disabled with the
  9301. ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
  9302. of servers that do not reliably preserve case in replies. See
  9303. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  9304. for more info.
  9305. - Check DNS replies for more matching fields to better resist DNS
  9306. poisoning.
  9307. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  9308. compress cells, which are basically all encrypted, compressed, or
  9309. both.
  9310. Changes in version 0.2.1.11-alpha - 2009-01-20
  9311. Tor 0.2.1.11-alpha finishes fixing the "if your Tor is off for a
  9312. week it will take a long time to bootstrap again" bug. It also fixes
  9313. an important security-related bug reported by Ilja van Sprundel. You
  9314. should upgrade. (We'll send out more details about the bug once people
  9315. have had some time to upgrade.)
  9316. o Security fixes:
  9317. - Fix a heap-corruption bug that may be remotely triggerable on
  9318. some platforms. Reported by Ilja van Sprundel.
  9319. o Major bugfixes:
  9320. - Discard router descriptors as we load them if they are more than
  9321. five days old. Otherwise if Tor is off for a long time and then
  9322. starts with cached descriptors, it will try to use the onion
  9323. keys in those obsolete descriptors when building circuits. Bugfix
  9324. on 0.2.0.x. Fixes bug 887.
  9325. o Minor features:
  9326. - Try to make sure that the version of Libevent we're running with
  9327. is binary-compatible with the one we built with. May address bug
  9328. 897 and others.
  9329. - Make setting ServerDNSRandomizeCase to 0 actually work. Bugfix
  9330. for bug 905. Bugfix on 0.2.1.7-alpha.
  9331. - Add a new --enable-local-appdata configuration switch to change
  9332. the default location of the datadir on win32 from APPDATA to
  9333. LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
  9334. entirely. Patch from coderman.
  9335. o Minor bugfixes:
  9336. - Make outbound DNS packets respect the OutboundBindAddress setting.
  9337. Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
  9338. - When our circuit fails at the first hop (e.g. we get a destroy
  9339. cell back), avoid using that OR connection anymore, and also
  9340. tell all the one-hop directory requests waiting for it that they
  9341. should fail. Bugfix on 0.2.1.3-alpha.
  9342. - In the torify(1) manpage, mention that tsocks will leak your
  9343. DNS requests.
  9344. Changes in version 0.2.1.10-alpha - 2009-01-06
  9345. Tor 0.2.1.10-alpha fixes two major bugs in bridge relays (one that
  9346. would make the bridge relay not so useful if it had DirPort set to 0,
  9347. and one that could let an attacker learn a little bit of information
  9348. about the bridge's users), and a bug that would cause your Tor relay
  9349. to ignore a circuit create request it can't decrypt (rather than reply
  9350. with an error). It also fixes a wide variety of other bugs.
  9351. o Major bugfixes:
  9352. - If the cached networkstatus consensus is more than five days old,
  9353. discard it rather than trying to use it. In theory it could
  9354. be useful because it lists alternate directory mirrors, but in
  9355. practice it just means we spend many minutes trying directory
  9356. mirrors that are long gone from the network. Helps bug 887 a bit;
  9357. bugfix on 0.2.0.x.
  9358. - Bridge relays that had DirPort set to 0 would stop fetching
  9359. descriptors shortly after startup, and then briefly resume
  9360. after a new bandwidth test and/or after publishing a new bridge
  9361. descriptor. Bridge users that try to bootstrap from them would
  9362. get a recent networkstatus but would get descriptors from up to
  9363. 18 hours earlier, meaning most of the descriptors were obsolete
  9364. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  9365. - Prevent bridge relays from serving their 'extrainfo' document
  9366. to anybody who asks, now that extrainfo docs include potentially
  9367. sensitive aggregated client geoip summaries. Bugfix on
  9368. 0.2.0.13-alpha.
  9369. o Minor features:
  9370. - New controller event "clients_seen" to report a geoip-based summary
  9371. of which countries we've seen clients from recently. Now controllers
  9372. like Vidalia can show bridge operators that they're actually making
  9373. a difference.
  9374. - Build correctly against versions of OpenSSL 0.9.8 or later built
  9375. without support for deprecated functions.
  9376. - Update to the "December 19 2008" ip-to-country file.
  9377. o Minor bugfixes (on 0.2.0.x):
  9378. - Authorities now vote for the Stable flag for any router whose
  9379. weighted MTBF is at least 5 days, regardless of the mean MTBF.
  9380. - Do not remove routers as too old if we do not have any consensus
  9381. document. Bugfix on 0.2.0.7-alpha.
  9382. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  9383. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  9384. - When an exit relay resolves a stream address to a local IP address,
  9385. do not just keep retrying that same exit relay over and
  9386. over. Instead, just close the stream. Addresses bug 872. Bugfix
  9387. on 0.2.0.32. Patch from rovv.
  9388. - If a hidden service sends us an END cell, do not consider
  9389. retrying the connection; just close it. Patch from rovv.
  9390. - When we made bridge authorities stop serving bridge descriptors over
  9391. unencrypted links, we also broke DirPort reachability testing for
  9392. bridges. So bridges with a non-zero DirPort were printing spurious
  9393. warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
  9394. - When a relay gets a create cell it can't decrypt (e.g. because it's
  9395. using the wrong onion key), we were dropping it and letting the
  9396. client time out. Now actually answer with a destroy cell. Fixes
  9397. bug 904. Bugfix on 0.0.2pre8.
  9398. - Squeeze 2-5% out of client performance (according to oprofile) by
  9399. improving the implementation of some policy-manipulation functions.
  9400. o Minor bugfixes (on 0.2.1.x):
  9401. - Make get_interface_address() function work properly again; stop
  9402. guessing the wrong parts of our address as our address.
  9403. - Do not cannibalize a circuit if we're out of RELAY_EARLY cells to
  9404. send on that circuit. Otherwise we might violate the proposal-110
  9405. limit. Bugfix on 0.2.1.3-alpha. Partial fix for bug 878. Diagnosis
  9406. thanks to Karsten.
  9407. - When we're sending non-EXTEND cells to the first hop in a circuit,
  9408. for example to use an encrypted directory connection, we don't need
  9409. to use RELAY_EARLY cells: the first hop knows what kind of cell
  9410. it is, and nobody else can even see the cell type. Conserving
  9411. RELAY_EARLY cells makes it easier to cannibalize circuits like
  9412. this later.
  9413. - Stop logging nameserver addresses in reverse order.
  9414. - If we are retrying a directory download slowly over and over, do
  9415. not automatically give up after the 254th failure. Bugfix on
  9416. 0.2.1.9-alpha.
  9417. - Resume reporting accurate "stream end" reasons to the local control
  9418. port. They were lost in the changes for Proposal 148. Bugfix on
  9419. 0.2.1.9-alpha.
  9420. o Deprecated and removed features:
  9421. - The old "tor --version --version" command, which would print out
  9422. the subversion "Id" of most of the source files, is now removed. It
  9423. turned out to be less useful than we'd expected, and harder to
  9424. maintain.
  9425. o Code simplifications and refactoring:
  9426. - Change our header file guard macros to be less likely to conflict
  9427. with system headers. Adam Langley noticed that we were conflicting
  9428. with log.h on Android.
  9429. - Tool-assisted documentation cleanup. Nearly every function or
  9430. static variable in Tor should have its own documentation now.
  9431. Changes in version 0.2.1.9-alpha - 2008-12-25
  9432. Tor 0.2.1.9-alpha fixes many more bugs, some of them security-related.
  9433. o New directory authorities:
  9434. - gabelmoo (the authority run by Karsten Loesing) now has a new
  9435. IP address.
  9436. o Security fixes:
  9437. - Never use a connection with a mismatched address to extend a
  9438. circuit, unless that connection is canonical. A canonical
  9439. connection is one whose address is authenticated by the router's
  9440. identity key, either in a NETINFO cell or in a router descriptor.
  9441. - Avoid a possible memory corruption bug when receiving hidden service
  9442. descriptors. Bugfix on 0.2.1.6-alpha.
  9443. o Major bugfixes:
  9444. - Fix a logic error that would automatically reject all but the first
  9445. configured DNS server. Bugfix on 0.2.1.5-alpha. Possible fix for
  9446. part of bug 813/868. Bug spotted by coderman.
  9447. - When a stream at an exit relay is in state "resolving" or
  9448. "connecting" and it receives an "end" relay cell, the exit relay
  9449. would silently ignore the end cell and not close the stream. If
  9450. the client never closes the circuit, then the exit relay never
  9451. closes the TCP connection. Bug introduced in 0.1.2.1-alpha;
  9452. reported by "wood".
  9453. - When we can't initialize DNS because the network is down, do not
  9454. automatically stop Tor from starting. Instead, retry failed
  9455. dns_init() every 10 minutes, and change the exit policy to reject
  9456. *:* until one succeeds. Fixes bug 691.
  9457. o Minor features:
  9458. - Give a better error message when an overzealous init script says
  9459. "sudo -u username tor --user username". Makes Bug 882 easier for
  9460. users to diagnose.
  9461. - When a directory authority gives us a new guess for our IP address,
  9462. log which authority we used. Hopefully this will help us debug
  9463. the recent complaints about bad IP address guesses.
  9464. - Detect svn revision properly when we're using git-svn.
  9465. - Try not to open more than one descriptor-downloading connection
  9466. to an authority at once. This should reduce load on directory
  9467. authorities. Fixes bug 366.
  9468. - Add cross-certification to newly generated certificates, so that
  9469. a signing key is enough information to look up a certificate.
  9470. Partial implementation of proposal 157.
  9471. - Start serving certificates by <identity digest, signing key digest>
  9472. pairs. Partial implementation of proposal 157.
  9473. - Clients now never report any stream end reason except 'MISC'.
  9474. Implements proposal 148.
  9475. - On platforms with a maximum syslog string length, truncate syslog
  9476. messages to that length ourselves, rather than relying on the
  9477. system to do it for us.
  9478. - Optimize out calls to time(NULL) that occur for every IO operation,
  9479. or for every cell. On systems where time() is a slow syscall,
  9480. this fix will be slightly helpful.
  9481. - Exit servers can now answer resolve requests for ip6.arpa addresses.
  9482. - When we download a descriptor that we then immediately (as
  9483. a directory authority) reject, do not retry downloading it right
  9484. away. Should save some bandwidth on authorities. Fix for bug
  9485. 888. Patch by Sebastian Hahn.
  9486. - When a download gets us zero good descriptors, do not notify
  9487. Tor that new directory information has arrived.
  9488. - Avoid some nasty corner cases in the logic for marking connections
  9489. as too old or obsolete or noncanonical for circuits. Partial
  9490. bugfix on bug 891.
  9491. o Minor features (controller):
  9492. - New CONSENSUS_ARRIVED event to note when a new consensus has
  9493. been fetched and validated.
  9494. - When we realize that another process has modified our cached
  9495. descriptors file, print out a more useful error message rather
  9496. than triggering an assertion. Fixes bug 885. Patch from Karsten.
  9497. - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
  9498. controllers to prevent SIGHUP from reloading the
  9499. configuration. Fixes bug 856.
  9500. o Minor bugfixes:
  9501. - Resume using the correct "REASON=" stream when telling the
  9502. controller why we closed a stream. Bugfix in 0.2.1.1-alpha.
  9503. - When a canonical connection appears later in our internal list
  9504. than a noncanonical one for a given OR ID, always use the
  9505. canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
  9506. Spotted by rovv.
  9507. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  9508. seconds. Warn the user if lower values are given in the
  9509. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  9510. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  9511. user if lower values are given in the configuration. Bugfix on
  9512. 0.1.1.17-rc. Patch by Sebastian.
  9513. - Fix a race condition when freeing keys shared between main thread
  9514. and CPU workers that could result in a memory leak. Bugfix on
  9515. 0.1.0.1-rc. Fixes bug 889.
  9516. o Minor bugfixes (hidden services):
  9517. - Do not throw away existing introduction points on SIGHUP (bugfix on
  9518. 0.0.6pre1); also, do not stall hidden services because we're
  9519. throwing away introduction points; bugfix on 0.2.1.7-alpha. Spotted
  9520. by John Brooks. Patch by Karsten. Fixes bug 874.
  9521. - Fix a memory leak when we decline to add a v2 rendezvous
  9522. descriptor to the cache because we already had a v0 descriptor
  9523. with the same ID. Bugfix on 0.2.0.18-alpha.
  9524. o Deprecated and removed features:
  9525. - RedirectExits has been removed. It was deprecated since
  9526. 0.2.0.3-alpha.
  9527. - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
  9528. has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
  9529. - Cell pools are now always enabled; --disable-cell-pools is ignored.
  9530. o Code simplifications and refactoring:
  9531. - Rename the confusing or_is_obsolete field to the more appropriate
  9532. is_bad_for_new_circs, and move it to or_connection_t where it
  9533. belongs.
  9534. - Move edge-only flags from connection_t to edge_connection_t: not
  9535. only is this better coding, but on machines of plausible alignment,
  9536. it should save 4-8 bytes per connection_t. "Every little bit helps."
  9537. - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
  9538. for consistency; keep old option working for backward compatibility.
  9539. - Simplify the code for finding connections to use for a circuit.
  9540. Changes in version 0.2.1.8-alpha - 2008-12-08
  9541. Tor 0.2.1.8-alpha fixes some crash bugs in earlier alpha releases,
  9542. builds better on unusual platforms like Solaris and old OS X, and
  9543. fixes a variety of other issues.
  9544. o Major features:
  9545. - New DirPortFrontPage option that takes an html file and publishes
  9546. it as "/" on the DirPort. Now relay operators can provide a
  9547. disclaimer without needing to set up a separate webserver. There's
  9548. a sample disclaimer in contrib/tor-exit-notice.html.
  9549. o Security fixes:
  9550. - When the client is choosing entry guards, now it selects at most
  9551. one guard from a given relay family. Otherwise we could end up with
  9552. all of our entry points into the network run by the same operator.
  9553. Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
  9554. o Major bugfixes:
  9555. - Fix a DOS opportunity during the voting signature collection process
  9556. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  9557. - Fix a possible segfault when establishing an exit connection. Bugfix
  9558. on 0.2.1.5-alpha.
  9559. o Minor bugfixes:
  9560. - Get file locking working on win32. Bugfix on 0.2.1.6-alpha. Fixes
  9561. bug 859.
  9562. - Made Tor a little less aggressive about deleting expired
  9563. certificates. Partial fix for bug 854.
  9564. - Stop doing unaligned memory access that generated bus errors on
  9565. sparc64. Bugfix on 0.2.0.10-alpha. Fix for bug 862.
  9566. - Fix a crash bug when changing EntryNodes from the controller. Bugfix
  9567. on 0.2.1.6-alpha. Fix for bug 867. Patched by Sebastian.
  9568. - Make USR2 log-level switch take effect immediately. Bugfix on
  9569. 0.1.2.8-beta.
  9570. - If one win32 nameserver fails to get added, continue adding the
  9571. rest, and don't automatically fail.
  9572. - Use fcntl() for locking when flock() is not available. Should fix
  9573. compilation on Solaris. Should fix Bug 873. Bugfix on 0.2.1.6-alpha.
  9574. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  9575. could make gcc generate non-functional binary search code. Bugfix
  9576. on 0.2.0.10-alpha.
  9577. - Build correctly on platforms without socklen_t.
  9578. - Avoid potential crash on internal error during signature collection.
  9579. Fixes bug 864. Patch from rovv.
  9580. - Do not use C's stdio library for writing to log files. This will
  9581. improve logging performance by a minute amount, and will stop
  9582. leaking fds when our disk is full. Fixes bug 861.
  9583. - Stop erroneous use of O_APPEND in cases where we did not in fact
  9584. want to re-seek to the end of a file before every last write().
  9585. - Correct handling of possible malformed authority signing key
  9586. certificates with internal signature types. Fixes bug 880. Bugfix
  9587. on 0.2.0.3-alpha.
  9588. - Fix a hard-to-trigger resource leak when logging credential status.
  9589. CID 349.
  9590. o Minor features:
  9591. - Directory mirrors no longer fetch the v1 directory or
  9592. running-routers files. They are obsolete, and nobody asks for them
  9593. anymore. This is the first step to making v1 authorities obsolete.
  9594. o Minor features (controller):
  9595. - Return circuit purposes in response to GETINFO circuit-status. Fixes
  9596. bug 858.
  9597. Changes in version 0.2.0.32 - 2008-11-20
  9598. Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  9599. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  9600. a smaller security flaw that might allow an attacker to access local
  9601. services, further improves hidden service performance, and fixes a
  9602. variety of other issues.
  9603. o Security fixes:
  9604. - The "User" and "Group" config options did not clear the
  9605. supplementary group entries for the Tor process. The "User" option
  9606. is now more robust, and we now set the groups to the specified
  9607. user's primary group. The "Group" option is now ignored. For more
  9608. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  9609. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  9610. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
  9611. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  9612. consistently obeyed: if an exit relay refuses a stream because its
  9613. exit policy doesn't allow it, we would remember what IP address
  9614. the relay said the destination address resolves to, even if it's
  9615. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  9616. o Major bugfixes:
  9617. - Fix a DOS opportunity during the voting signature collection process
  9618. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  9619. o Major bugfixes (hidden services):
  9620. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  9621. we were failing the whole hidden service request when the v0
  9622. descriptor fetch fails, even if the v2 fetch is still pending and
  9623. might succeed. Similarly, if the last v2 fetch fails, we were
  9624. failing the whole hidden service request even if a v0 fetch is
  9625. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  9626. - When extending a circuit to a hidden service directory to upload a
  9627. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  9628. requests failed, because the router descriptor has not been
  9629. downloaded yet. In these cases, do not attempt to upload the
  9630. rendezvous descriptor, but wait until the router descriptor is
  9631. downloaded and retry. Likewise, do not attempt to fetch a rendezvous
  9632. descriptor from a hidden service directory for which the router
  9633. descriptor has not yet been downloaded. Fixes bug 767. Bugfix
  9634. on 0.2.0.10-alpha.
  9635. o Minor bugfixes:
  9636. - Fix several infrequent memory leaks spotted by Coverity.
  9637. - When testing for libevent functions, set the LDFLAGS variable
  9638. correctly. Found by Riastradh.
  9639. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  9640. bootstrapping with tunneled directory connections. Bugfix on
  9641. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  9642. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  9643. and we know that server B rejects most-but-not all connections to
  9644. port 80, we would previously reject the connection. Now, we assume
  9645. the user knows what they were asking for. Fixes bug 752. Bugfix
  9646. on 0.0.9rc5. Diagnosed by BarkerJr.
  9647. - If we overrun our per-second write limits a little, count this as
  9648. having used up our write allocation for the second, and choke
  9649. outgoing directory writes. Previously, we had only counted this when
  9650. we had met our limits precisely. Fixes bug 824. Patch from by rovv.
  9651. Bugfix on 0.2.0.x (??).
  9652. - Remove the old v2 directory authority 'lefkada' from the default
  9653. list. It has been gone for many months.
  9654. - Stop doing unaligned memory access that generated bus errors on
  9655. sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
  9656. - Make USR2 log-level switch take effect immediately. Bugfix on
  9657. 0.1.2.8-beta.
  9658. o Minor bugfixes (controller):
  9659. - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
  9660. 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
  9661. Changes in version 0.2.1.7-alpha - 2008-11-08
  9662. Tor 0.2.1.7-alpha fixes a major security problem in Debian and Ubuntu
  9663. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  9664. a smaller security flaw that might allow an attacker to access local
  9665. services, adds better defense against DNS poisoning attacks on exit
  9666. relays, further improves hidden service performance, and fixes a
  9667. variety of other issues.
  9668. o Security fixes:
  9669. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  9670. consistently obeyed: if an exit relay refuses a stream because its
  9671. exit policy doesn't allow it, we would remember what IP address
  9672. the relay said the destination address resolves to, even if it's
  9673. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  9674. - The "User" and "Group" config options did not clear the
  9675. supplementary group entries for the Tor process. The "User" option
  9676. is now more robust, and we now set the groups to the specified
  9677. user's primary group. The "Group" option is now ignored. For more
  9678. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  9679. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  9680. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848.
  9681. - Do not use or believe expired v3 authority certificates. Patch
  9682. from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
  9683. o Minor features:
  9684. - Now NodeFamily and MyFamily config options allow spaces in
  9685. identity fingerprints, so it's easier to paste them in.
  9686. Suggested by Lucky Green.
  9687. - Implement the 0x20 hack to better resist DNS poisoning: set the
  9688. case on outgoing DNS requests randomly, and reject responses that do
  9689. not match the case correctly. This logic can be disabled with the
  9690. ServerDNSRandomizeCase setting, if you are using one of the 0.3%
  9691. of servers that do not reliably preserve case in replies. See
  9692. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  9693. for more info.
  9694. - Preserve case in replies to DNSPort requests in order to support
  9695. the 0x20 hack for resisting DNS poisoning attacks.
  9696. o Hidden service performance improvements:
  9697. - When the client launches an introduction circuit, retry with a
  9698. new circuit after 30 seconds rather than 60 seconds.
  9699. - Launch a second client-side introduction circuit in parallel
  9700. after a delay of 15 seconds (based on work by Christian Wilms).
  9701. - Hidden services start out building five intro circuits rather
  9702. than three, and when the first three finish they publish a service
  9703. descriptor using those. Now we publish our service descriptor much
  9704. faster after restart.
  9705. o Minor bugfixes:
  9706. - Minor fix in the warning messages when you're having problems
  9707. bootstrapping; also, be more forgiving of bootstrap problems when
  9708. we're still making incremental progress on a given bootstrap phase.
  9709. - When we're choosing an exit node for a circuit, and we have
  9710. no pending streams, choose a good general exit rather than one that
  9711. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  9712. - Send a valid END cell back when a client tries to connect to a
  9713. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  9714. 840. Patch from rovv.
  9715. - If a broken client asks a non-exit router to connect somewhere,
  9716. do not even do the DNS lookup before rejecting the connection.
  9717. Fixes another case of bug 619. Patch from rovv.
  9718. - Fix another case of assuming, when a specific exit is requested,
  9719. that we know more than the user about what hosts it allows.
  9720. Fixes another case of bug 752. Patch from rovv.
  9721. - Check which hops rendezvous stream cells are associated with to
  9722. prevent possible guess-the-streamid injection attacks from
  9723. intermediate hops. Fixes another case of bug 446. Based on patch
  9724. from rovv.
  9725. - Avoid using a negative right-shift when comparing 32-bit
  9726. addresses. Possible fix for bug 845 and bug 811.
  9727. - Make the assert_circuit_ok() function work correctly on circuits that
  9728. have already been marked for close.
  9729. - Fix read-off-the-end-of-string error in unit tests when decoding
  9730. introduction points.
  9731. - Fix uninitialized size field for memory area allocation: may improve
  9732. memory performance during directory parsing.
  9733. - Treat duplicate certificate fetches as failures, so that we do
  9734. not try to re-fetch an expired certificate over and over and over.
  9735. - Do not say we're fetching a certificate when we'll in fact skip it
  9736. because of a pending download.
  9737. Changes in version 0.2.1.6-alpha - 2008-09-30
  9738. Tor 0.2.1.6-alpha further improves performance and robustness of
  9739. hidden services, starts work on supporting per-country relay selection,
  9740. and fixes a variety of smaller issues.
  9741. o Major features:
  9742. - Implement proposal 121: make it possible to build hidden services
  9743. that only certain clients are allowed to connect to. This is
  9744. enforced at several points, so that unauthorized clients are unable
  9745. to send INTRODUCE cells to the service, or even (depending on the
  9746. type of authentication) to learn introduction points. This feature
  9747. raises the bar for certain kinds of active attacks against hidden
  9748. services. Code by Karsten Loesing.
  9749. - Relays now store and serve v2 hidden service descriptors by default,
  9750. i.e., the new default value for HidServDirectoryV2 is 1. This is
  9751. the last step in proposal 114, which aims to make hidden service
  9752. lookups more reliable.
  9753. - Start work to allow node restrictions to include country codes. The
  9754. syntax to exclude nodes in a country with country code XX is
  9755. "ExcludeNodes {XX}". Patch from Robert Hogan. It still needs some
  9756. refinement to decide what config options should take priority if
  9757. you ask to both use a particular node and exclude it.
  9758. - Allow ExitNodes list to include IP ranges and country codes, just
  9759. like the Exclude*Nodes lists. Patch from Robert Hogan.
  9760. o Major bugfixes:
  9761. - Fix a bug when parsing ports in tor_addr_port_parse() that caused
  9762. Tor to fail to start if you had it configured to use a bridge
  9763. relay. Fixes bug 809. Bugfix on 0.2.1.5-alpha.
  9764. - When extending a circuit to a hidden service directory to upload a
  9765. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  9766. requests failed, because the router descriptor had not been
  9767. downloaded yet. In these cases, we now wait until the router
  9768. descriptor is downloaded, and then retry. Likewise, clients
  9769. now skip over a hidden service directory if they don't yet have
  9770. its router descriptor, rather than futilely requesting it and
  9771. putting mysterious complaints in the logs. Fixes bug 767. Bugfix
  9772. on 0.2.0.10-alpha.
  9773. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  9774. we were failing the whole hidden service request when the v0
  9775. descriptor fetch fails, even if the v2 fetch is still pending and
  9776. might succeed. Similarly, if the last v2 fetch fails, we were
  9777. failing the whole hidden service request even if a v0 fetch is
  9778. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  9779. - DNS replies need to have names matching their requests, but
  9780. these names should be in the questions section, not necessarily
  9781. in the answers section. Fixes bug 823. Bugfix on 0.2.1.5-alpha.
  9782. o Minor features:
  9783. - Update to the "September 1 2008" ip-to-country file.
  9784. - Allow ports 465 and 587 in the default exit policy again. We had
  9785. rejected them in 0.1.0.15, because back in 2005 they were commonly
  9786. misconfigured and ended up as spam targets. We hear they are better
  9787. locked down these days.
  9788. - Use a lockfile to make sure that two Tor processes are not
  9789. simultaneously running with the same datadir.
  9790. - Serve the latest v3 networkstatus consensus via the control
  9791. port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
  9792. - Better logging about stability/reliability calculations on directory
  9793. servers.
  9794. - Drop the requirement to have an open dir port for storing and
  9795. serving v2 hidden service descriptors.
  9796. - Directory authorities now serve a /tor/dbg-stability.txt URL to
  9797. help debug WFU and MTBF calculations.
  9798. - Implement most of Proposal 152: allow specialized servers to permit
  9799. single-hop circuits, and clients to use those servers to build
  9800. single-hop circuits when using a specialized controller. Patch
  9801. from Josh Albrecht. Resolves feature request 768.
  9802. - Add a -p option to tor-resolve for specifying the SOCKS port: some
  9803. people find host:port too confusing.
  9804. - Make TrackHostExit mappings expire a while after their last use, not
  9805. after their creation. Patch from Robert Hogan.
  9806. - Provide circuit purposes along with circuit events to the controller.
  9807. o Minor bugfixes:
  9808. - Fix compile on OpenBSD 4.4-current. Bugfix on 0.2.1.5-alpha.
  9809. Reported by Tas.
  9810. - Fixed some memory leaks -- some quite frequent, some almost
  9811. impossible to trigger -- based on results from Coverity.
  9812. - When testing for libevent functions, set the LDFLAGS variable
  9813. correctly. Found by Riastradh.
  9814. - Fix an assertion bug in parsing policy-related options; possible fix
  9815. for bug 811.
  9816. - Catch and report a few more bootstrapping failure cases when Tor
  9817. fails to establish a TCP connection. Cleanup on 0.2.1.x.
  9818. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  9819. bootstrapping with tunneled directory connections. Bugfix on
  9820. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  9821. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  9822. and we know that server B rejects most-but-not all connections to
  9823. port 80, we would previously reject the connection. Now, we assume
  9824. the user knows what they were asking for. Fixes bug 752. Bugfix
  9825. on 0.0.9rc5. Diagnosed by BarkerJr.
  9826. - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
  9827. service directories if they have no advertised dir port. Bugfix
  9828. on 0.2.0.10-alpha.
  9829. - If we overrun our per-second write limits a little, count this as
  9830. having used up our write allocation for the second, and choke
  9831. outgoing directory writes. Previously, we had only counted this when
  9832. we had met our limits precisely. Fixes bug 824. Patch by rovv.
  9833. Bugfix on 0.2.0.x (??).
  9834. - Avoid a "0 divided by 0" calculation when calculating router uptime
  9835. at directory authorities. Bugfix on 0.2.0.8-alpha.
  9836. - Make DNS resolved controller events into "CLOSED", not
  9837. "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
  9838. bug 807.
  9839. - Fix a bug where an unreachable relay would establish enough
  9840. reachability testing circuits to do a bandwidth test -- if
  9841. we already have a connection to the middle hop of the testing
  9842. circuit, then it could establish the last hop by using the existing
  9843. connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
  9844. circuits no longer use entry guards in 0.2.1.3-alpha.
  9845. - If we have correct permissions on $datadir, we complain to stdout
  9846. and fail to start. But dangerous permissions on
  9847. $datadir/cached-status/ would cause us to open a log and complain
  9848. there. Now complain to stdout and fail to start in both cases. Fixes
  9849. bug 820, reported by seeess.
  9850. - Remove the old v2 directory authority 'lefkada' from the default
  9851. list. It has been gone for many months.
  9852. o Code simplifications and refactoring:
  9853. - Revise the connection_new functions so that a more typesafe variant
  9854. exists. This will work better with Coverity, and let us find any
  9855. actual mistakes we're making here.
  9856. - Refactor unit testing logic so that dmalloc can be used sensibly
  9857. with unit tests to check for memory leaks.
  9858. - Move all hidden-service related fields from connection and circuit
  9859. structure to substructures: this way they won't eat so much memory.
  9860. Changes in version 0.2.0.31 - 2008-09-03
  9861. Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  9862. a big bug we're seeing where in rare cases traffic from one Tor stream
  9863. gets mixed into another stream, and fixes a variety of smaller issues.
  9864. o Major bugfixes:
  9865. - Make sure that two circuits can never exist on the same connection
  9866. with the same circuit ID, even if one is marked for close. This
  9867. is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
  9868. - Relays now reject risky extend cells: if the extend cell includes
  9869. a digest of all zeroes, or asks to extend back to the relay that
  9870. sent the extend cell, tear down the circuit. Ideas suggested
  9871. by rovv.
  9872. - If not enough of our entry guards are available so we add a new
  9873. one, we might use the new one even if it overlapped with the
  9874. current circuit's exit relay (or its family). Anonymity bugfix
  9875. pointed out by rovv.
  9876. o Minor bugfixes:
  9877. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  9878. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  9879. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  9880. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  9881. - Pick size of default geoip filename string correctly on windows.
  9882. Fixes bug 806. Bugfix on 0.2.0.30.
  9883. - Make the autoconf script accept the obsolete --with-ssl-dir
  9884. option as an alias for the actually-working --with-openssl-dir
  9885. option. Fix the help documentation to recommend --with-openssl-dir.
  9886. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  9887. - When using the TransPort option on OpenBSD, and using the User
  9888. option to change UID and drop privileges, make sure to open
  9889. /dev/pf before dropping privileges. Fixes bug 782. Patch from
  9890. Christopher Davis. Bugfix on 0.1.2.1-alpha.
  9891. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  9892. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  9893. on the client side when connecting to a hidden service. Bugfix
  9894. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  9895. - When closing an application-side connection because its circuit is
  9896. getting torn down, generate the stream event correctly. Bugfix on
  9897. 0.1.2.x. Anonymous patch.
  9898. Changes in version 0.2.1.5-alpha - 2008-08-31
  9899. Tor 0.2.1.5-alpha moves us closer to handling IPv6 destinations, puts
  9900. in a lot of the infrastructure for adding authorization to hidden
  9901. services, lays the groundwork for having clients read their load
  9902. balancing information out of the networkstatus consensus rather than
  9903. the individual router descriptors, addresses two potential anonymity
  9904. issues, and fixes a variety of smaller issues.
  9905. o Major features:
  9906. - Convert many internal address representations to optionally hold
  9907. IPv6 addresses.
  9908. - Generate and accept IPv6 addresses in many protocol elements.
  9909. - Make resolver code handle nameservers located at ipv6 addresses.
  9910. - Begin implementation of proposal 121 ("Client authorization for
  9911. hidden services"): configure hidden services with client
  9912. authorization, publish descriptors for them, and configure
  9913. authorization data for hidden services at clients. The next
  9914. step is to actually access hidden services that perform client
  9915. authorization.
  9916. - More progress toward proposal 141: Network status consensus
  9917. documents and votes now contain bandwidth information for each
  9918. router and a summary of that router's exit policy. Eventually this
  9919. will be used by clients so that they do not have to download every
  9920. known descriptor before building circuits.
  9921. o Major bugfixes (on 0.2.0.x and before):
  9922. - When sending CREATED cells back for a given circuit, use a 64-bit
  9923. connection ID to find the right connection, rather than an addr:port
  9924. combination. Now that we can have multiple OR connections between
  9925. the same ORs, it is no longer possible to use addr:port to uniquely
  9926. identify a connection.
  9927. - Relays now reject risky extend cells: if the extend cell includes
  9928. a digest of all zeroes, or asks to extend back to the relay that
  9929. sent the extend cell, tear down the circuit. Ideas suggested
  9930. by rovv.
  9931. - If not enough of our entry guards are available so we add a new
  9932. one, we might use the new one even if it overlapped with the
  9933. current circuit's exit relay (or its family). Anonymity bugfix
  9934. pointed out by rovv.
  9935. o Minor bugfixes:
  9936. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  9937. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  9938. - When using the TransPort option on OpenBSD, and using the User
  9939. option to change UID and drop privileges, make sure to open /dev/pf
  9940. before dropping privileges. Fixes bug 782. Patch from Christopher
  9941. Davis. Bugfix on 0.1.2.1-alpha.
  9942. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  9943. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  9944. - Add a missing safe_str() call for a debug log message.
  9945. - Use 64 bits instead of 32 bits for connection identifiers used with
  9946. the controller protocol, to greatly reduce risk of identifier reuse.
  9947. - Make the autoconf script accept the obsolete --with-ssl-dir
  9948. option as an alias for the actually-working --with-openssl-dir
  9949. option. Fix the help documentation to recommend --with-openssl-dir.
  9950. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  9951. o Minor features:
  9952. - Rate-limit too-many-sockets messages: when they happen, they happen
  9953. a lot. Resolves bug 748.
  9954. - Resist DNS poisoning a little better by making sure that names in
  9955. answer sections match.
  9956. - Print the SOCKS5 error message string as well as the error code
  9957. when a tor-resolve request fails. Patch from Jacob.
  9958. Changes in version 0.2.1.4-alpha - 2008-08-04
  9959. Tor 0.2.1.4-alpha fixes a pair of crash bugs in 0.2.1.3-alpha.
  9960. o Major bugfixes:
  9961. - The address part of exit policies was not correctly written
  9962. to router descriptors. This generated router descriptors that failed
  9963. their self-checks. Noticed by phobos, fixed by Karsten. Bugfix
  9964. on 0.2.1.3-alpha.
  9965. - Tor triggered a false assert when extending a circuit to a relay
  9966. but we already have a connection open to that relay. Noticed by
  9967. phobos, fixed by Karsten. Bugfix on 0.2.1.3-alpha.
  9968. o Minor bugfixes:
  9969. - Fix a hidden service logging bug: in some edge cases, the router
  9970. descriptor of a previously picked introduction point becomes
  9971. obsolete and we need to give up on it rather than continually
  9972. complaining that it has become obsolete. Observed by xiando. Bugfix
  9973. on 0.2.1.3-alpha.
  9974. o Removed features:
  9975. - Take out the TestVia config option, since it was a workaround for
  9976. a bug that was fixed in Tor 0.1.1.21.
  9977. Changes in version 0.2.1.3-alpha - 2008-08-03
  9978. Tor 0.2.1.3-alpha implements most of the pieces to prevent
  9979. infinite-length circuit attacks (see proposal 110); fixes a bug that
  9980. might cause exit relays to corrupt streams they send back; allows
  9981. address patterns (e.g. 255.128.0.0/16) to appear in ExcludeNodes and
  9982. ExcludeExitNodes config options; and fixes a big pile of bugs.
  9983. o Bootstrapping bugfixes (on 0.2.1.x-alpha):
  9984. - Send a bootstrap problem "warn" event on the first problem if the
  9985. reason is NO_ROUTE (that is, our network is down).
  9986. o Major features:
  9987. - Implement most of proposal 110: The first K cells to be sent
  9988. along a circuit are marked as special "early" cells; only K "early"
  9989. cells will be allowed. Once this code is universal, we can block
  9990. certain kinds of DOS attack by requiring that EXTEND commands must
  9991. be sent using an "early" cell.
  9992. o Major bugfixes:
  9993. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  9994. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  9995. on the client side when connecting to a hidden service. Bugfix
  9996. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  9997. - Ensure that two circuits can never exist on the same connection
  9998. with the same circuit ID, even if one is marked for close. This
  9999. is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
  10000. o Minor features:
  10001. - When relays do their initial bandwidth measurement, don't limit
  10002. to just our entry guards for the test circuits. Otherwise we tend
  10003. to have multiple test circuits going through a single entry guard,
  10004. which makes our bandwidth test less accurate. Fixes part of bug 654;
  10005. patch contributed by Josh Albrecht.
  10006. - Add an ExcludeExitNodes option so users can list a set of nodes
  10007. that should be be excluded from the exit node position, but
  10008. allowed elsewhere. Implements proposal 151.
  10009. - Allow address patterns (e.g., 255.128.0.0/16) to appear in
  10010. ExcludeNodes and ExcludeExitNodes lists.
  10011. - Change the implementation of ExcludeNodes and ExcludeExitNodes to
  10012. be more efficient. Formerly it was quadratic in the number of
  10013. servers; now it should be linear. Fixes bug 509.
  10014. - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
  10015. and n_conn_id_digest fields into a separate structure that's
  10016. only needed when the circuit has not yet attached to an n_conn.
  10017. o Minor bugfixes:
  10018. - Change the contrib/tor.logrotate script so it makes the new
  10019. logs as "_tor:_tor" rather than the default, which is generally
  10020. "root:wheel". Fixes bug 676, reported by Serge Koksharov.
  10021. - Stop using __attribute__((nonnull)) with GCC: it can give us useful
  10022. warnings (occasionally), but it can also cause the compiler to
  10023. eliminate error-checking code. Suggested by Peter Gutmann.
  10024. - When a hidden service is giving up on an introduction point candidate
  10025. that was not included in the last published rendezvous descriptor,
  10026. don't reschedule publication of the next descriptor. Fixes bug 763.
  10027. Bugfix on 0.0.9.3.
  10028. - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
  10029. HiddenServiceExcludeNodes as obsolete: they never worked properly,
  10030. and nobody claims to be using them. Fixes bug 754. Bugfix on
  10031. 0.1.0.1-rc. Patch from Christian Wilms.
  10032. - Fix a small alignment and memory-wasting bug on buffer chunks.
  10033. Spotted by rovv.
  10034. o Minor bugfixes (controller):
  10035. - When closing an application-side connection because its circuit
  10036. is getting torn down, generate the stream event correctly.
  10037. Bugfix on 0.1.2.x. Anonymous patch.
  10038. o Removed features:
  10039. - Remove all backward-compatibility code to support relays running
  10040. versions of Tor so old that they no longer work at all on the
  10041. Tor network.
  10042. Changes in version 0.2.0.30 - 2008-07-15
  10043. o Minor bugfixes:
  10044. - Stop using __attribute__((nonnull)) with GCC: it can give us useful
  10045. warnings (occasionally), but it can also cause the compiler to
  10046. eliminate error-checking code. Suggested by Peter Gutmann.
  10047. Changes in version 0.2.0.29-rc - 2008-07-08
  10048. Tor 0.2.0.29-rc fixes two big bugs with using bridges, fixes more
  10049. hidden-service performance bugs, and fixes a bunch of smaller bugs.
  10050. o Major bugfixes:
  10051. - If you have more than one bridge but don't know their keys,
  10052. you would only launch a request for the descriptor of the first one
  10053. on your list. (Tor considered launching requests for the others, but
  10054. found that it already had a connection on the way for $0000...0000
  10055. so it didn't open another.) Bugfix on 0.2.0.x.
  10056. - If you have more than one bridge but don't know their keys, and the
  10057. connection to one of the bridges failed, you would cancel all
  10058. pending bridge connections. (After all, they all have the same
  10059. digest.) Bugfix on 0.2.0.x.
  10060. - When a hidden service was trying to establish an introduction point,
  10061. and Tor had built circuits preemptively for such purposes, we
  10062. were ignoring all the preemptive circuits and launching a new one
  10063. instead. Bugfix on 0.2.0.14-alpha.
  10064. - When a hidden service was trying to establish an introduction point,
  10065. and Tor *did* manage to reuse one of the preemptively built
  10066. circuits, it didn't correctly remember which one it used,
  10067. so it asked for another one soon after, until there were no
  10068. more preemptive circuits, at which point it launched one from
  10069. scratch. Bugfix on 0.0.9.x.
  10070. - Make directory servers include the X-Your-Address-Is: http header in
  10071. their responses even for begin_dir conns. Now clients who only
  10072. ever use begin_dir connections still have a way to learn their IP
  10073. address. Fixes bug 737; bugfix on 0.2.0.22-rc. Reported by goldy.
  10074. o Minor bugfixes:
  10075. - Fix a macro/CPP interaction that was confusing some compilers:
  10076. some GCCs don't like #if/#endif pairs inside macro arguments.
  10077. Fixes bug 707.
  10078. - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
  10079. Fixes bug 704; fix from Steven Murdoch.
  10080. - When opening /dev/null in finish_daemonize(), do not pass the
  10081. O_CREAT flag. Fortify was complaining, and correctly so. Fixes
  10082. bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
  10083. - Correctly detect transparent proxy support on Linux hosts that
  10084. require in.h to be included before netfilter_ipv4.h. Patch
  10085. from coderman.
  10086. - Disallow session resumption attempts during the renegotiation
  10087. stage of the v2 handshake protocol. Clients should never be trying
  10088. session resumption at this point, but apparently some did, in
  10089. ways that caused the handshake to fail. Bugfix on 0.2.0.20-rc. Bug
  10090. found by Geoff Goodell.
  10091. Changes in version 0.2.1.2-alpha - 2008-06-20
  10092. Tor 0.2.1.2-alpha includes a new "TestingTorNetwork" config option to
  10093. make it easier to set up your own private Tor network; fixes several
  10094. big bugs with using more than one bridge relay; fixes a big bug with
  10095. offering hidden services quickly after Tor starts; and uses a better
  10096. API for reporting potential bootstrapping problems to the controller.
  10097. o Major features:
  10098. - New TestingTorNetwork config option to allow adjustment of
  10099. previously constant values that, while reasonable, could slow
  10100. bootstrapping. Implements proposal 135. Patch from Karsten.
  10101. o Major bugfixes:
  10102. - If you have more than one bridge but don't know their digests,
  10103. you would only learn a request for the descriptor of the first one
  10104. on your list. (Tor considered launching requests for the others, but
  10105. found that it already had a connection on the way for $0000...0000
  10106. so it didn't open another.) Bugfix on 0.2.0.x.
  10107. - If you have more than one bridge but don't know their digests,
  10108. and the connection to one of the bridges failed, you would cancel
  10109. all pending bridge connections. (After all, they all have the
  10110. same digest.) Bugfix on 0.2.0.x.
  10111. - When establishing a hidden service, introduction points that
  10112. originate from cannibalized circuits are completely ignored and not
  10113. included in rendezvous service descriptors. This might be another
  10114. reason for delay in making a hidden service available. Bugfix
  10115. from long ago (0.0.9.x?)
  10116. o Minor features:
  10117. - Allow OpenSSL to use dynamic locks if it wants.
  10118. - When building a consensus, do not include routers that are down.
  10119. This will cut down 30% to 40% on consensus size. Implements
  10120. proposal 138.
  10121. - In directory authorities' approved-routers files, allow
  10122. fingerprints with or without space.
  10123. - Add a "GETINFO /status/bootstrap-phase" controller option, so the
  10124. controller can query our current bootstrap state in case it attaches
  10125. partway through and wants to catch up.
  10126. - Send an initial "Starting" bootstrap status event, so we have a
  10127. state to start out in.
  10128. o Minor bugfixes:
  10129. - Asking for a conditional consensus at .../consensus/<fingerprints>
  10130. would crash a dirserver if it did not already have a
  10131. consensus. Bugfix on 0.2.1.1-alpha.
  10132. - Clean up some macro/CPP interactions: some GCC versions don't like
  10133. #if/#endif pairs inside macro arguments. Fixes bug 707. Bugfix on
  10134. 0.2.0.x.
  10135. o Bootstrapping bugfixes (on 0.2.1.1-alpha):
  10136. - Directory authorities shouldn't complain about bootstrapping
  10137. problems just because they do a lot of reachability testing and
  10138. some of the connection attempts fail.
  10139. - Start sending "count" and "recommendation" key/value pairs in
  10140. bootstrap problem status events, so the controller can hear about
  10141. problems even before Tor decides they're worth reporting for sure.
  10142. - If you're using bridges, generate "bootstrap problem" warnings
  10143. as soon as you run out of working bridges, rather than waiting
  10144. for ten failures -- which will never happen if you have less than
  10145. ten bridges.
  10146. - If we close our OR connection because there's been a circuit
  10147. pending on it for too long, we were telling our bootstrap status
  10148. events "REASON=NONE". Now tell them "REASON=TIMEOUT".
  10149. Changes in version 0.2.1.1-alpha - 2008-06-13
  10150. Tor 0.2.1.1-alpha fixes a lot of memory fragmentation problems that
  10151. were making the Tor process bloat especially on Linux; makes our TLS
  10152. handshake blend in better; sends "bootstrap phase" status events to
  10153. the controller, so it can keep the user informed of progress (and
  10154. problems) fetching directory information and establishing circuits;
  10155. and adds a variety of smaller features.
  10156. o Major features:
  10157. - More work on making our TLS handshake blend in: modify the list
  10158. of ciphers advertised by OpenSSL in client mode to even more
  10159. closely resemble a common web browser. We cheat a little so that
  10160. we can advertise ciphers that the locally installed OpenSSL doesn't
  10161. know about.
  10162. - Start sending "bootstrap phase" status events to the controller,
  10163. so it can keep the user informed of progress fetching directory
  10164. information and establishing circuits. Also inform the controller
  10165. if we think we're stuck at a particular bootstrap phase. Implements
  10166. proposal 137.
  10167. - Resume using OpenSSL's RAND_poll() for better (and more portable)
  10168. cross-platform entropy collection again. We used to use it, then
  10169. stopped using it because of a bug that could crash systems that
  10170. called RAND_poll when they had a lot of fds open. It looks like the
  10171. bug got fixed in late 2006. Our new behavior is to call RAND_poll()
  10172. at startup, and to call RAND_poll() when we reseed later only if
  10173. we have a non-buggy OpenSSL version.
  10174. o Major bugfixes:
  10175. - When we choose to abandon a new entry guard because we think our
  10176. older ones might be better, close any circuits pending on that
  10177. new entry guard connection. This fix should make us recover much
  10178. faster when our network is down and then comes back. Bugfix on
  10179. 0.1.2.8-beta; found by lodger.
  10180. o Memory fixes and improvements:
  10181. - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
  10182. to avoid unused RAM in buffer chunks and memory pools.
  10183. - Speed up parsing and cut down on memory fragmentation by using
  10184. stack-style allocations for parsing directory objects. Previously,
  10185. this accounted for over 40% of allocations from within Tor's code
  10186. on a typical directory cache.
  10187. - Use a Bloom filter rather than a digest-based set to track which
  10188. descriptors we need to keep around when we're cleaning out old
  10189. router descriptors. This speeds up the computation significantly,
  10190. and may reduce fragmentation.
  10191. - Reduce the default smartlist size from 32 to 16; it turns out that
  10192. most smartlists hold around 8-12 elements tops.
  10193. - Make dumpstats() log the fullness and size of openssl-internal
  10194. buffers.
  10195. - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
  10196. patch to their OpenSSL, turn it on to save memory on servers. This
  10197. patch will (with any luck) get included in a mainline distribution
  10198. before too long.
  10199. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  10200. compress cells, which are basically all encrypted, compressed,
  10201. or both.
  10202. o Minor bugfixes:
  10203. - Stop reloading the router list from disk for no reason when we
  10204. run out of reachable directory mirrors. Once upon a time reloading
  10205. it would set the 'is_running' flag back to 1 for them. It hasn't
  10206. done that for a long time.
  10207. - In very rare situations new hidden service descriptors were
  10208. published earlier than 30 seconds after the last change to the
  10209. service. (We currently think that a hidden service descriptor
  10210. that's been stable for 30 seconds is worth publishing.)
  10211. o Minor features:
  10212. - Allow separate log levels to be configured for different logging
  10213. domains. For example, this allows one to log all notices, warnings,
  10214. or errors, plus all memory management messages of level debug or
  10215. higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
  10216. - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
  10217. and stop using a warning that had become unfixably verbose under
  10218. GCC 4.3.
  10219. - New --hush command-line option similar to --quiet. While --quiet
  10220. disables all logging to the console on startup, --hush limits the
  10221. output to messages of warning and error severity.
  10222. - Servers support a new URL scheme for consensus downloads that
  10223. allows the client to specify which authorities are trusted.
  10224. The server then only sends the consensus if the client will trust
  10225. it. Otherwise a 404 error is sent back. Clients use this
  10226. new scheme when the server supports it (meaning it's running
  10227. 0.2.1.1-alpha or later). Implements proposal 134.
  10228. - New configure/torrc options (--enable-geoip-stats,
  10229. DirRecordUsageByCountry) to record how many IPs we've served
  10230. directory info to in each country code, how many status documents
  10231. total we've sent to each country code, and what share of the total
  10232. directory requests we should expect to see.
  10233. - Use the TLS1 hostname extension to more closely resemble browser
  10234. behavior.
  10235. - Lots of new unit tests.
  10236. - Add a macro to implement the common pattern of iterating through
  10237. two parallel lists in lockstep.
  10238. Changes in version 0.2.0.28-rc - 2008-06-13
  10239. Tor 0.2.0.28-rc fixes an anonymity-related bug, fixes a hidden-service
  10240. performance bug, and fixes a bunch of smaller bugs.
  10241. o Anonymity fixes:
  10242. - Fix a bug where, when we were choosing the 'end stream reason' to
  10243. put in our relay end cell that we send to the exit relay, Tor
  10244. clients on Windows were sometimes sending the wrong 'reason'. The
  10245. anonymity problem is that exit relays may be able to guess whether
  10246. the client is running Windows, thus helping partition the anonymity
  10247. set. Down the road we should stop sending reasons to exit relays,
  10248. or otherwise prevent future versions of this bug.
  10249. o Major bugfixes:
  10250. - While setting up a hidden service, some valid introduction circuits
  10251. were overlooked and abandoned. This might be the reason for
  10252. the long delay in making a hidden service available. Bugfix on
  10253. 0.2.0.14-alpha.
  10254. o Minor features:
  10255. - Update to the "June 9 2008" ip-to-country file.
  10256. - Run 'make test' as part of 'make dist', so we stop releasing so
  10257. many development snapshots that fail their unit tests.
  10258. o Minor bugfixes:
  10259. - When we're checking if we have enough dir info for each relay
  10260. to begin establishing circuits, make sure that we actually have
  10261. the descriptor listed in the consensus, not just any descriptor.
  10262. Bugfix on 0.1.2.x.
  10263. - Bridge relays no longer print "xx=0" in their extrainfo document
  10264. for every single country code in the geoip db. Bugfix on
  10265. 0.2.0.27-rc.
  10266. - Only warn when we fail to load the geoip file if we were planning to
  10267. include geoip stats in our extrainfo document. Bugfix on 0.2.0.27-rc.
  10268. - If we change our MaxAdvertisedBandwidth and then reload torrc,
  10269. Tor won't realize it should publish a new relay descriptor. Fixes
  10270. bug 688, reported by mfr. Bugfix on 0.1.2.x.
  10271. - When we haven't had any application requests lately, don't bother
  10272. logging that we have expired a bunch of descriptors. Bugfix
  10273. on 0.1.2.x.
  10274. - Make relay cells written on a connection count as non-padding when
  10275. tracking how long a connection has been in use. Bugfix on
  10276. 0.2.0.1-alpha. Spotted by lodger.
  10277. - Fix unit tests in 0.2.0.27-rc.
  10278. - Fix compile on Windows.
  10279. Changes in version 0.2.0.27-rc - 2008-06-03
  10280. Tor 0.2.0.27-rc adds a few features we left out of the earlier
  10281. release candidates. In particular, we now include an IP-to-country
  10282. GeoIP database, so controllers can easily look up what country a
  10283. given relay is in, and so bridge relays can give us some sanitized
  10284. summaries about which countries are making use of bridges. (See proposal
  10285. 126-geoip-fetching.txt for details.)
  10286. o Major features:
  10287. - Include an IP-to-country GeoIP file in the tarball, so bridge
  10288. relays can report sanitized summaries of the usage they're seeing.
  10289. o Minor features:
  10290. - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
  10291. Robert Hogan. Fixes the first part of bug 681.
  10292. - Make bridge authorities never serve extrainfo docs.
  10293. - Add support to detect Libevent versions in the 1.4.x series
  10294. on mingw.
  10295. - Fix build on gcc 4.3 with --enable-gcc-warnings set.
  10296. - Include a new contrib/tor-exit-notice.html file that exit relay
  10297. operators can put on their website to help reduce abuse queries.
  10298. o Minor bugfixes:
  10299. - When tunneling an encrypted directory connection, and its first
  10300. circuit fails, do not leave it unattached and ask the controller
  10301. to deal. Fixes the second part of bug 681.
  10302. - Make bridge authorities correctly expire old extrainfo documents
  10303. from time to time.
  10304. Changes in version 0.2.0.26-rc - 2008-05-13
  10305. Tor 0.2.0.26-rc fixes a major security vulnerability caused by a bug
  10306. in Debian's OpenSSL packages. All users running any 0.2.0.x version
  10307. should upgrade, whether they're running Debian or not.
  10308. o Major security fixes:
  10309. - Use new V3 directory authority keys on the tor26, gabelmoo, and
  10310. moria1 V3 directory authorities. The old keys were generated with
  10311. a vulnerable version of Debian's OpenSSL package, and must be
  10312. considered compromised. Other authorities' keys were not generated
  10313. with an affected version of OpenSSL.
  10314. o Major bugfixes:
  10315. - List authority signatures as "unrecognized" based on DirServer
  10316. lines, not on cert cache. Bugfix on 0.2.0.x.
  10317. o Minor features:
  10318. - Add a new V3AuthUseLegacyKey option to make it easier for
  10319. authorities to change their identity keys if they have to.
  10320. Changes in version 0.2.0.25-rc - 2008-04-23
  10321. Tor 0.2.0.25-rc makes Tor work again on OS X and certain BSDs.
  10322. o Major bugfixes:
  10323. - Remember to initialize threading before initializing logging.
  10324. Otherwise, many BSD-family implementations will crash hard on
  10325. startup. Fixes bug 671. Bugfix on 0.2.0.24-rc.
  10326. o Minor bugfixes:
  10327. - Authorities correctly free policies on bad servers on
  10328. exit. Fixes bug 672. Bugfix on 0.2.0.x.
  10329. Changes in version 0.2.0.24-rc - 2008-04-22
  10330. Tor 0.2.0.24-rc adds dizum (run by Alex de Joode) as the new sixth
  10331. v3 directory authority, makes relays with dynamic IP addresses and no
  10332. DirPort notice more quickly when their IP address changes, fixes a few
  10333. rare crashes and memory leaks, and fixes a few other miscellaneous bugs.
  10334. o New directory authorities:
  10335. - Take lefkada out of the list of v3 directory authorities, since
  10336. it has been down for months.
  10337. - Set up dizum (run by Alex de Joode) as the new sixth v3 directory
  10338. authority.
  10339. o Major bugfixes:
  10340. - Detect address changes more quickly on non-directory mirror
  10341. relays. Bugfix on 0.2.0.18-alpha; fixes bug 652.
  10342. o Minor features (security):
  10343. - Reject requests for reverse-dns lookup of names that are in
  10344. a private address space. Patch from lodger.
  10345. - Non-exit relays no longer allow DNS requests. Fixes bug 619. Patch
  10346. from lodger.
  10347. o Minor bugfixes (crashes):
  10348. - Avoid a rare assert that can trigger when Tor doesn't have much
  10349. directory information yet and it tries to fetch a v2 hidden
  10350. service descriptor. Fixes bug 651, reported by nwf.
  10351. - Initialize log mutex before initializing dmalloc. Otherwise,
  10352. running with dmalloc would crash. Bugfix on 0.2.0.x-alpha.
  10353. - Use recursive pthread mutexes in order to avoid deadlock when
  10354. logging debug-level messages to a controller. Bug spotted by nwf,
  10355. bugfix on 0.2.0.16-alpha.
  10356. o Minor bugfixes (resource management):
  10357. - Keep address policies from leaking memory: start their refcount
  10358. at 1, not 2. Bugfix on 0.2.0.16-alpha.
  10359. - Free authority certificates on exit, so they don't look like memory
  10360. leaks. Bugfix on 0.2.0.19-alpha.
  10361. - Free static hashtables for policy maps and for TLS connections on
  10362. shutdown, so they don't look like memory leaks. Bugfix on 0.2.0.x.
  10363. - Avoid allocating extra space when computing consensuses on 64-bit
  10364. platforms. Bug spotted by aakova.
  10365. o Minor bugfixes (misc):
  10366. - Do not read the configuration file when we've only been told to
  10367. generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
  10368. based on patch from Sebastian Hahn.
  10369. - Exit relays that are used as a client can now reach themselves
  10370. using the .exit notation, rather than just launching an infinite
  10371. pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
  10372. - When attempting to open a logfile fails, tell us why.
  10373. - Fix a dumb bug that was preventing us from knowing that we should
  10374. preemptively build circuits to handle expected directory requests.
  10375. Fixes bug 660. Bugfix on 0.1.2.x.
  10376. - Warn less verbosely about clock skew from netinfo cells from
  10377. untrusted sources. Fixes bug 663.
  10378. - Make controller stream events for DNS requests more consistent,
  10379. by adding "new stream" events for DNS requests, and removing
  10380. spurious "stream closed" events" for cached reverse resolves.
  10381. Patch from mwenge. Fixes bug 646.
  10382. - Correctly notify one-hop connections when a circuit build has
  10383. failed. Possible fix for bug 669. Found by lodger.
  10384. Changes in version 0.2.0.23-rc - 2008-03-24
  10385. Tor 0.2.0.23-rc is the fourth release candidate for the 0.2.0 series. It
  10386. makes bootstrapping faster if the first directory mirror you contact
  10387. is down. The bundles also include the new Vidalia 0.1.2 release.
  10388. o Major bugfixes:
  10389. - When a tunneled directory request is made to a directory server
  10390. that's down, notice after 30 seconds rather than 120 seconds. Also,
  10391. fail any begindir streams that are pending on it, so they can
  10392. retry elsewhere. This was causing multi-minute delays on bootstrap.
  10393. Changes in version 0.2.0.22-rc - 2008-03-18
  10394. Tor 0.2.0.22-rc is the third release candidate for the 0.2.0 series. It
  10395. enables encrypted directory connections by default for non-relays, fixes
  10396. some broken TLS behavior we added in 0.2.0.20-rc, and resolves many
  10397. other bugs. The bundles also include Vidalia 0.1.1 and Torbutton 1.1.17.
  10398. o Major features:
  10399. - Enable encrypted directory connections by default for non-relays,
  10400. so censor tools that block Tor directory connections based on their
  10401. plaintext patterns will no longer work. This means Tor works in
  10402. certain censored countries by default again.
  10403. o Major bugfixes:
  10404. - Make sure servers always request certificates from clients during
  10405. TLS renegotiation. Reported by lodger; bugfix on 0.2.0.20-rc.
  10406. - Do not enter a CPU-eating loop when a connection is closed in
  10407. the middle of client-side TLS renegotiation. Fixes bug 622. Bug
  10408. diagnosed by lodger; bugfix on 0.2.0.20-rc.
  10409. - Fix assertion failure that could occur when a blocked circuit
  10410. became unblocked, and it had pending client DNS requests. Bugfix
  10411. on 0.2.0.1-alpha. Fixes bug 632.
  10412. o Minor bugfixes (on 0.1.2.x):
  10413. - Generate "STATUS_SERVER" events rather than misspelled
  10414. "STATUS_SEVER" events. Caught by mwenge.
  10415. - When counting the number of bytes written on a TLS connection,
  10416. look at the BIO actually used for writing to the network, not
  10417. at the BIO used (sometimes) to buffer data for the network.
  10418. Looking at different BIOs could result in write counts on the
  10419. order of ULONG_MAX. Fixes bug 614.
  10420. - On Windows, correctly detect errors when listing the contents of
  10421. a directory. Fix from lodger.
  10422. o Minor bugfixes (on 0.2.0.x):
  10423. - Downgrade "sslv3 alert handshake failure" message to INFO.
  10424. - If we set RelayBandwidthRate and RelayBandwidthBurst very high but
  10425. left BandwidthRate and BandwidthBurst at the default, we would be
  10426. silently limited by those defaults. Now raise them to match the
  10427. RelayBandwidth* values.
  10428. - Fix the SVK version detection logic to work correctly on a branch.
  10429. - Make --enable-openbsd-malloc work correctly on Linux with alpha
  10430. CPUs. Fixes bug 625.
  10431. - Logging functions now check that the passed severity is sane.
  10432. - Use proper log levels in the testsuite call of
  10433. get_interface_address6().
  10434. - When using a nonstandard malloc, do not use the platform values for
  10435. HAVE_MALLOC_GOOD_SIZE or HAVE_MALLOC_USABLE_SIZE.
  10436. - Make the openbsd malloc code use 8k pages on alpha CPUs and
  10437. 16k pages on ia64.
  10438. - Detect mismatched page sizes when using --enable-openbsd-malloc.
  10439. - Avoid double-marked-for-close warning when certain kinds of invalid
  10440. .in-addr.arpa addresses are passed to the DNSPort. Part of a fix
  10441. for bug 617. Bugfix on 0.2.0.1-alpha.
  10442. - Make sure that the "NULL-means-reject *:*" convention is followed by
  10443. all the policy manipulation functions, avoiding some possible crash
  10444. bugs. Bug found by lodger. Bugfix on 0.2.0.16-alpha.
  10445. - Fix the implementation of ClientDNSRejectInternalAddresses so that it
  10446. actually works, and doesn't warn about every single reverse lookup.
  10447. Fixes the other part of bug 617. Bugfix on 0.2.0.1-alpha.
  10448. o Minor features:
  10449. - Only log guard node status when guard node status has changed.
  10450. - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
  10451. make "INFO" 75% less verbose.
  10452. Changes in version 0.2.0.21-rc - 2008-03-02
  10453. Tor 0.2.0.21-rc is the second release candidate for the 0.2.0 series. It
  10454. makes Tor work well with Vidalia again, fixes a rare assert bug,
  10455. and fixes a pair of more minor bugs. The bundles also include Vidalia
  10456. 0.1.0 and Torbutton 1.1.16.
  10457. o Major bugfixes:
  10458. - The control port should declare that it requires password auth
  10459. when HashedControlSessionPassword is set too. Patch from Matt Edman;
  10460. bugfix on 0.2.0.20-rc. Fixes bug 615.
  10461. - Downgrade assert in connection_buckets_decrement() to a log message.
  10462. This may help us solve bug 614, and in any case will make its
  10463. symptoms less severe. Bugfix on 0.2.0.20-rc. Reported by fredzupy.
  10464. - We were sometimes miscounting the number of bytes read from the
  10465. network, causing our rate limiting to not be followed exactly.
  10466. Bugfix on 0.2.0.16-alpha. Reported by lodger.
  10467. o Minor bugfixes:
  10468. - Fix compilation with OpenSSL 0.9.8 and 0.9.8a. All other supported
  10469. OpenSSL versions should have been working fine. Diagnosis and patch
  10470. from lodger, Karsten Loesing, and Sebastian Hahn. Fixes bug 616.
  10471. Bugfix on 0.2.0.20-rc.
  10472. Changes in version 0.2.0.20-rc - 2008-02-24
  10473. Tor 0.2.0.20-rc is the first release candidate for the 0.2.0 series. It
  10474. makes more progress towards normalizing Tor's TLS handshake, makes
  10475. hidden services work better again, helps relays bootstrap if they don't
  10476. know their IP address, adds optional support for linking in openbsd's
  10477. allocator or tcmalloc, allows really fast relays to scale past 15000
  10478. sockets, and fixes a bunch of minor bugs reported by Veracode.
  10479. o Major features:
  10480. - Enable the revised TLS handshake based on the one designed by
  10481. Steven Murdoch in proposal 124, as revised in proposal 130. It
  10482. includes version negotiation for OR connections as described in
  10483. proposal 105. The new handshake is meant to be harder for censors
  10484. to fingerprint, and it adds the ability to detect certain kinds of
  10485. man-in-the-middle traffic analysis attacks. The version negotiation
  10486. feature will allow us to improve Tor's link protocol more safely
  10487. in the future.
  10488. - Choose which bridge to use proportional to its advertised bandwidth,
  10489. rather than uniformly at random. This should speed up Tor for
  10490. bridge users. Also do this for people who set StrictEntryNodes.
  10491. - When a TrackHostExits-chosen exit fails too many times in a row,
  10492. stop using it. Bugfix on 0.1.2.x; fixes bug 437.
  10493. o Major bugfixes:
  10494. - Resolved problems with (re-)fetching hidden service descriptors.
  10495. Patch from Karsten Loesing; fixes problems with 0.2.0.18-alpha
  10496. and 0.2.0.19-alpha.
  10497. - If we only ever used Tor for hidden service lookups or posts, we
  10498. would stop building circuits and start refusing connections after
  10499. 24 hours, since we falsely believed that Tor was dormant. Reported
  10500. by nwf; bugfix on 0.1.2.x.
  10501. - Servers that don't know their own IP address should go to the
  10502. authorities for their first directory fetch, even if their DirPort
  10503. is off or if they don't know they're reachable yet. This will help
  10504. them bootstrap better. Bugfix on 0.2.0.18-alpha; fixes bug 609.
  10505. - When counting the number of open sockets, count not only the number
  10506. of sockets we have received from the socket() call, but also
  10507. the number we've gotten from accept() and socketpair(). This bug
  10508. made us fail to count all sockets that we were using for incoming
  10509. connections. Bugfix on 0.2.0.x.
  10510. - Fix code used to find strings within buffers, when those strings
  10511. are not in the first chunk of the buffer. Bugfix on 0.2.0.x.
  10512. - Fix potential segfault when parsing HTTP headers. Bugfix on 0.2.0.x.
  10513. - Add a new __HashedControlSessionPassword option for controllers
  10514. to use for one-off session password hashes that shouldn't get
  10515. saved to disk by SAVECONF --- Vidalia users were accumulating a
  10516. pile of HashedControlPassword lines in their torrc files, one for
  10517. each time they had restarted Tor and then clicked Save. Make Tor
  10518. automatically convert "HashedControlPassword" to this new option but
  10519. only when it's given on the command line. Partial fix for bug 586.
  10520. o Minor features (performance):
  10521. - Tune parameters for cell pool allocation to minimize amount of
  10522. RAM overhead used.
  10523. - Add OpenBSD malloc code from phk as an optional malloc
  10524. replacement on Linux: some glibc libraries do very poorly
  10525. with Tor's memory allocation patterns. Pass
  10526. --enable-openbsd-malloc to get the replacement malloc code.
  10527. - Add a --with-tcmalloc option to the configure script to link
  10528. against tcmalloc (if present). Does not yet search for
  10529. non-system include paths.
  10530. - Stop imposing an arbitrary maximum on the number of file descriptors
  10531. used for busy servers. Bug reported by Olaf Selke; patch from
  10532. Sebastian Hahn.
  10533. o Minor features (other):
  10534. - When SafeLogging is disabled, log addresses along with all TLS
  10535. errors.
  10536. - When building with --enable-gcc-warnings, check for whether Apple's
  10537. warning "-Wshorten-64-to-32" is available.
  10538. - Add a --passphrase-fd argument to the tor-gencert command for
  10539. scriptability.
  10540. o Minor bugfixes (memory leaks and code problems):
  10541. - We were leaking a file descriptor if Tor started with a zero-length
  10542. cached-descriptors file. Patch by freddy77; bugfix on 0.1.2.
  10543. - Detect size overflow in zlib code. Reported by Justin Ferguson and
  10544. Dan Kaminsky.
  10545. - We were comparing the raw BridgePassword entry with a base64'ed
  10546. version of it, when handling a "/tor/networkstatus-bridges"
  10547. directory request. Now compare correctly. Noticed by Veracode.
  10548. - Recover from bad tracked-since value in MTBF-history file.
  10549. Should fix bug 537.
  10550. - Alter the code that tries to recover from unhandled write
  10551. errors, to not try to flush onto a socket that's given us
  10552. unhandled errors. Bugfix on 0.1.2.x.
  10553. - Make Unix controlsockets work correctly on OpenBSD. Patch from
  10554. tup. Bugfix on 0.2.0.3-alpha.
  10555. o Minor bugfixes (other):
  10556. - If we have an extra-info document for our server, always make
  10557. it available on the control port, even if we haven't gotten
  10558. a copy of it from an authority yet. Patch from mwenge.
  10559. - Log the correct memory chunk sizes for empty RAM chunks in mempool.c.
  10560. - Directory mirrors no longer include a guess at the client's IP
  10561. address if the connection appears to be coming from the same /24
  10562. network; it was producing too many wrong guesses.
  10563. - Make the new hidden service code respect the SafeLogging setting.
  10564. Bugfix on 0.2.0.x. Patch from Karsten.
  10565. - When starting as an authority, do not overwrite all certificates
  10566. cached from other authorities. Bugfix on 0.2.0.x. Fixes bug 606.
  10567. - If we're trying to flush the last bytes on a connection (for
  10568. example, when answering a directory request), reset the
  10569. time-to-give-up timeout every time we manage to write something
  10570. on the socket. Bugfix on 0.1.2.x.
  10571. - Change the behavior of "getinfo status/good-server-descriptor"
  10572. so it doesn't return failure when any authority disappears.
  10573. - Even though the man page said that "TrackHostExits ." should
  10574. work, nobody had ever implemented it. Bugfix on 0.1.0.x.
  10575. - Report TLS "zero return" case as a "clean close" and "IO error"
  10576. as a "close". Stop calling closes "unexpected closes": existing
  10577. Tors don't use SSL_close(), so having a connection close without
  10578. the TLS shutdown handshake is hardly unexpected.
  10579. - Send NAMESERVER_STATUS messages for a single failed nameserver
  10580. correctly.
  10581. o Code simplifications and refactoring:
  10582. - Remove the tor_strpartition function: its logic was confused,
  10583. and it was only used for one thing that could be implemented far
  10584. more easily.
  10585. Changes in version 0.2.0.19-alpha - 2008-02-09
  10586. Tor 0.2.0.19-alpha makes more progress towards normalizing Tor's TLS
  10587. handshake, makes path selection for relays more secure and IP address
  10588. guessing more robust, and generally fixes a lot of bugs in preparation
  10589. for calling the 0.2.0 branch stable.
  10590. o Major features:
  10591. - Do not include recognizeable strings in the commonname part of
  10592. Tor's x509 certificates.
  10593. o Major bugfixes:
  10594. - If we're a relay, avoid picking ourselves as an introduction point,
  10595. a rendezvous point, or as the final hop for internal circuits. Bug
  10596. reported by taranis and lodger. Bugfix on 0.1.2.x.
  10597. - Patch from "Andrew S. Lists" to catch when we contact a directory
  10598. mirror at IP address X and he says we look like we're coming from
  10599. IP address X. Bugfix on 0.1.2.x.
  10600. o Minor features (security):
  10601. - Be more paranoid about overwriting sensitive memory on free(),
  10602. as a defensive programming tactic to ensure forward secrecy.
  10603. o Minor features (directory authority):
  10604. - Actually validate the options passed to AuthDirReject,
  10605. AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
  10606. - Reject router descriptors with out-of-range bandwidthcapacity or
  10607. bandwidthburst values.
  10608. o Minor features (controller):
  10609. - Reject controller commands over 1MB in length. This keeps rogue
  10610. processes from running us out of memory.
  10611. o Minor features (misc):
  10612. - Give more descriptive well-formedness errors for out-of-range
  10613. hidden service descriptor/protocol versions.
  10614. - Make memory debugging information describe more about history
  10615. of cell allocation, so we can help reduce our memory use.
  10616. o Deprecated features (controller):
  10617. - The status/version/num-versioning and status/version/num-concurring
  10618. GETINFO options are no longer useful in the v3 directory protocol:
  10619. treat them as deprecated, and warn when they're used.
  10620. o Minor bugfixes:
  10621. - When our consensus networkstatus has been expired for a while, stop
  10622. being willing to build circuits using it. Fixes bug 401. Bugfix
  10623. on 0.1.2.x.
  10624. - Directory caches now fetch certificates from all authorities
  10625. listed in a networkstatus consensus, even when they do not
  10626. recognize them. Fixes bug 571. Bugfix on 0.2.0.x.
  10627. - When connecting to a bridge without specifying its key, insert
  10628. the connection into the identity-to-connection map as soon as
  10629. a key is learned. Fixes bug 574. Bugfix on 0.2.0.x.
  10630. - Detect versions of OS X where malloc_good_size() is present in the
  10631. library but never actually declared. Resolves bug 587. Bugfix
  10632. on 0.2.0.x.
  10633. - Stop incorrectly truncating zlib responses to directory authority
  10634. signature download requests. Fixes bug 593. Bugfix on 0.2.0.x.
  10635. - Stop recommending that every server operator send mail to tor-ops.
  10636. Resolves bug 597. Bugfix on 0.1.2.x.
  10637. - Don't trigger an assert if we start a directory authority with a
  10638. private IP address (like 127.0.0.1).
  10639. - Avoid possible failures when generating a directory with routers
  10640. with over-long versions strings, or too many flags set. Bugfix
  10641. on 0.1.2.x.
  10642. - If an attempt to launch a DNS resolve request over the control
  10643. port fails because we have overrun the limit on the number of
  10644. connections, tell the controller that the request has failed.
  10645. - Avoid using too little bandwidth when our clock skips a few
  10646. seconds. Bugfix on 0.1.2.x.
  10647. - Fix shell error when warning about missing packages in configure
  10648. script, on Fedora or Red Hat machines. Bugfix on 0.2.0.x.
  10649. - Do not become confused when receiving a spurious VERSIONS-like
  10650. cell from a confused v1 client. Bugfix on 0.2.0.x.
  10651. - Re-fetch v2 (as well as v0) rendezvous descriptors when all
  10652. introduction points for a hidden service have failed. Patch from
  10653. Karsten Loesing. Bugfix on 0.2.0.x.
  10654. o Code simplifications and refactoring:
  10655. - Remove some needless generality from cpuworker code, for improved
  10656. type-safety.
  10657. - Stop overloading the circuit_t.onionskin field for both "onionskin
  10658. from a CREATE cell that we are waiting for a cpuworker to be
  10659. assigned" and "onionskin from an EXTEND cell that we are going to
  10660. send to an OR as soon as we are connected". Might help with bug 600.
  10661. - Add an in-place version of aes_crypt() so that we can avoid doing a
  10662. needless memcpy() call on each cell payload.
  10663. Changes in version 0.2.0.18-alpha - 2008-01-25
  10664. Tor 0.2.0.18-alpha adds a sixth v3 directory authority run by CCC,
  10665. fixes a big memory leak in 0.2.0.17-alpha, and adds new config options
  10666. that can warn or reject connections to ports generally associated with
  10667. vulnerable-plaintext protocols.
  10668. o New directory authorities:
  10669. - Set up dannenberg (run by CCC) as the sixth v3 directory
  10670. authority.
  10671. o Major bugfixes:
  10672. - Fix a major memory leak when attempting to use the v2 TLS
  10673. handshake code. Bugfix on 0.2.0.x; fixes bug 589.
  10674. - We accidentally enabled the under-development v2 TLS handshake
  10675. code, which was causing log entries like "TLS error while
  10676. renegotiating handshake". Disable it again. Resolves bug 590.
  10677. - We were computing the wrong Content-Length: header for directory
  10678. responses that need to be compressed on the fly, causing clients
  10679. asking for those items to always fail. Bugfix on 0.2.0.x; partially
  10680. fixes bug 593.
  10681. o Major features:
  10682. - Avoid going directly to the directory authorities even if you're a
  10683. relay, if you haven't found yourself reachable yet or if you've
  10684. decided not to advertise your dirport yet. Addresses bug 556.
  10685. - If we've gone 12 hours since our last bandwidth check, and we
  10686. estimate we have less than 50KB bandwidth capacity but we could
  10687. handle more, do another bandwidth test.
  10688. - New config options WarnPlaintextPorts and RejectPlaintextPorts so
  10689. Tor can warn and/or refuse connections to ports commonly used with
  10690. vulnerable-plaintext protocols. Currently we warn on ports 23,
  10691. 109, 110, and 143, but we don't reject any.
  10692. o Minor bugfixes:
  10693. - When we setconf ClientOnly to 1, close any current OR and Dir
  10694. listeners. Reported by mwenge.
  10695. - When we get a consensus that's been signed by more people than
  10696. we expect, don't log about it; it's not a big deal. Reported
  10697. by Kyle Williams.
  10698. o Minor features:
  10699. - Don't answer "/tor/networkstatus-bridges" directory requests if
  10700. the request isn't encrypted.
  10701. - Make "ClientOnly 1" config option disable directory ports too.
  10702. - Patches from Karsten Loesing to make v2 hidden services more
  10703. robust: work even when there aren't enough HSDir relays available;
  10704. retry when a v2 rend desc fetch fails; but don't retry if we
  10705. already have a usable v0 rend desc.
  10706. Changes in version 0.2.0.17-alpha - 2008-01-17
  10707. Tor 0.2.0.17-alpha makes the tarball build cleanly again (whoops).
  10708. o Compile fixes:
  10709. - Make the tor-gencert man page get included correctly in the tarball.
  10710. Changes in version 0.2.0.16-alpha - 2008-01-17
  10711. Tor 0.2.0.16-alpha adds a fifth v3 directory authority run by Karsten
  10712. Loesing, and generally cleans up a lot of features and minor bugs.
  10713. o New directory authorities:
  10714. - Set up gabelmoo (run by Karsten Loesing) as the fifth v3 directory
  10715. authority.
  10716. o Major performance improvements:
  10717. - Switch our old ring buffer implementation for one more like that
  10718. used by free Unix kernels. The wasted space in a buffer with 1mb
  10719. of data will now be more like 8k than 1mb. The new implementation
  10720. also avoids realloc();realloc(); patterns that can contribute to
  10721. memory fragmentation.
  10722. o Minor features:
  10723. - Configuration files now accept C-style strings as values. This
  10724. helps encode characters not allowed in the current configuration
  10725. file format, such as newline or #. Addresses bug 557.
  10726. - Although we fixed bug 539 (where servers would send HTTP status 503
  10727. responses _and_ send a body too), there are still servers out
  10728. there that haven't upgraded. Therefore, make clients parse such
  10729. bodies when they receive them.
  10730. - When we're not serving v2 directory information, there is no reason
  10731. to actually keep any around. Remove the obsolete files and directory
  10732. on startup if they are very old and we aren't going to serve them.
  10733. o Minor performance improvements:
  10734. - Reference-count and share copies of address policy entries; only 5%
  10735. of them were actually distinct.
  10736. - Never walk through the list of logs if we know that no log is
  10737. interested in a given message.
  10738. o Minor bugfixes:
  10739. - When an authority has not signed a consensus, do not try to
  10740. download a nonexistent "certificate with key 00000000". Bugfix
  10741. on 0.2.0.x. Fixes bug 569.
  10742. - Fix a rare assert error when we're closing one of our threads:
  10743. use a mutex to protect the list of logs, so we never write to the
  10744. list as it's being freed. Bugfix on 0.1.2.x. Fixes the very rare
  10745. bug 575, which is kind of the revenge of bug 222.
  10746. - Patch from Karsten Loesing to complain less at both the client
  10747. and the relay when a relay used to have the HSDir flag but doesn't
  10748. anymore, and we try to upload a hidden service descriptor.
  10749. - Stop leaking one cert per TLS context. Fixes bug 582. Bugfix on
  10750. 0.2.0.15-alpha.
  10751. - Do not try to download missing certificates until we have tried
  10752. to check our fallback consensus. Fixes bug 583.
  10753. - Make bridges round reported GeoIP stats info up to the nearest
  10754. estimate, not down. Now we can distinguish between "0 people from
  10755. this country" and "1 person from this country".
  10756. - Avoid a spurious free on base64 failure. Bugfix on 0.1.2.
  10757. - Avoid possible segfault if key generation fails in
  10758. crypto_pk_hybrid_encrypt. Bugfix on 0.2.0.
  10759. - Avoid segfault in the case where a badly behaved v2 versioning
  10760. directory sends a signed networkstatus with missing client-versions.
  10761. Bugfix on 0.1.2.
  10762. - Avoid segfaults on certain complex invocations of
  10763. router_get_by_hexdigest(). Bugfix on 0.1.2.
  10764. - Correct bad index on array access in parse_http_time(). Bugfix
  10765. on 0.2.0.
  10766. - Fix possible bug in vote generation when server versions are present
  10767. but client versions are not.
  10768. - Fix rare bug on REDIRECTSTREAM control command when called with no
  10769. port set: it could erroneously report an error when none had
  10770. happened.
  10771. - Avoid bogus crash-prone, leak-prone tor_realloc when we're
  10772. compressing large objects and find ourselves with more than 4k
  10773. left over. Bugfix on 0.2.0.
  10774. - Fix a small memory leak when setting up a hidden service.
  10775. - Fix a few memory leaks that could in theory happen under bizarre
  10776. error conditions.
  10777. - Fix an assert if we post a general-purpose descriptor via the
  10778. control port but that descriptor isn't mentioned in our current
  10779. network consensus. Bug reported by Jon McLachlan; bugfix on
  10780. 0.2.0.9-alpha.
  10781. o Minor features (controller):
  10782. - Get NS events working again. Patch from tup.
  10783. - The GETCONF command now escapes and quotes configuration values
  10784. that don't otherwise fit into the torrc file.
  10785. - The SETCONF command now handles quoted values correctly.
  10786. o Minor features (directory authorities):
  10787. - New configuration options to override default maximum number of
  10788. servers allowed on a single IP address. This is important for
  10789. running a test network on a single host.
  10790. - Actually implement the -s option to tor-gencert.
  10791. - Add a manual page for tor-gencert.
  10792. o Minor features (bridges):
  10793. - Bridge authorities no longer serve bridge descriptors over
  10794. unencrypted connections.
  10795. o Minor features (other):
  10796. - Add hidden services and DNSPorts to the list of things that make
  10797. Tor accept that it has running ports. Change starting Tor with no
  10798. ports from a fatal error to a warning; we might change it back if
  10799. this turns out to confuse anybody. Fixes bug 579.
  10800. Changes in version 0.1.2.19 - 2008-01-17
  10801. Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  10802. exit policy a little bit more conservative so it's safer to run an
  10803. exit relay on a home system, and fixes a variety of smaller issues.
  10804. o Security fixes:
  10805. - Exit policies now reject connections that are addressed to a
  10806. relay's public (external) IP address too, unless
  10807. ExitPolicyRejectPrivate is turned off. We do this because too
  10808. many relays are running nearby to services that trust them based
  10809. on network address.
  10810. o Major bugfixes:
  10811. - When the clock jumps forward a lot, do not allow the bandwidth
  10812. buckets to become negative. Fixes bug 544.
  10813. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  10814. on every successful resolve. Reported by Mike Perry.
  10815. - Purge old entries from the "rephist" database and the hidden
  10816. service descriptor database even when DirPort is zero.
  10817. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  10818. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  10819. crashing or mis-answering these requests.
  10820. - When we decide to send a 503 response to a request for servers, do
  10821. not then also send the server descriptors: this defeats the whole
  10822. purpose. Fixes bug 539.
  10823. o Minor bugfixes:
  10824. - Changing the ExitPolicyRejectPrivate setting should cause us to
  10825. rebuild our server descriptor.
  10826. - Fix handling of hex nicknames when answering controller requests for
  10827. networkstatus by name, or when deciding whether to warn about
  10828. unknown routers in a config option. (Patch from mwenge.)
  10829. - Fix a couple of hard-to-trigger autoconf problems that could result
  10830. in really weird results on platforms whose sys/types.h files define
  10831. nonstandard integer types.
  10832. - Don't try to create the datadir when running --verify-config or
  10833. --hash-password. Resolves bug 540.
  10834. - If we were having problems getting a particular descriptor from the
  10835. directory caches, and then we learned about a new descriptor for
  10836. that router, we weren't resetting our failure count. Reported
  10837. by lodger.
  10838. - Although we fixed bug 539 (where servers would send HTTP status 503
  10839. responses _and_ send a body too), there are still servers out there
  10840. that haven't upgraded. Therefore, make clients parse such bodies
  10841. when they receive them.
  10842. - Run correctly on systems where rlim_t is larger than unsigned long.
  10843. This includes some 64-bit systems.
  10844. - Run correctly on platforms (like some versions of OS X 10.5) where
  10845. the real limit for number of open files is OPEN_FILES, not rlim_max
  10846. from getrlimit(RLIMIT_NOFILES).
  10847. - Avoid a spurious free on base64 failure.
  10848. - Avoid segfaults on certain complex invocations of
  10849. router_get_by_hexdigest().
  10850. - Fix rare bug on REDIRECTSTREAM control command when called with no
  10851. port set: it could erroneously report an error when none had
  10852. happened.
  10853. Changes in version 0.2.0.15-alpha - 2007-12-25
  10854. Tor 0.2.0.14-alpha and 0.2.0.15-alpha fix a bunch of bugs with the
  10855. features added in 0.2.0.13-alpha.
  10856. o Major bugfixes:
  10857. - Fix several remotely triggerable asserts based on DirPort requests
  10858. for a v2 or v3 networkstatus object before we were prepared. This
  10859. was particularly bad for 0.2.0.13 and later bridge relays, who
  10860. would never have a v2 networkstatus and would thus always crash
  10861. when used. Bugfixes on 0.2.0.x.
  10862. - Estimate the v3 networkstatus size more accurately, rather than
  10863. estimating it at zero bytes and giving it artificially high priority
  10864. compared to other directory requests. Bugfix on 0.2.0.x.
  10865. o Minor bugfixes:
  10866. - Fix configure.in logic for cross-compilation.
  10867. - When we load a bridge descriptor from the cache, and it was
  10868. previously unreachable, mark it as retriable so we won't just
  10869. ignore it. Also, try fetching a new copy immediately. Bugfixes
  10870. on 0.2.0.13-alpha.
  10871. - The bridge GeoIP stats were counting other relays, for example
  10872. self-reachability and authority-reachability tests.
  10873. o Minor features:
  10874. - Support compilation to target iPhone; patch from cjacker huang.
  10875. To build for iPhone, pass the --enable-iphone option to configure.
  10876. Changes in version 0.2.0.14-alpha - 2007-12-23
  10877. o Major bugfixes:
  10878. - Fix a crash on startup if you install Tor 0.2.0.13-alpha fresh
  10879. without a datadirectory from a previous Tor install. Reported
  10880. by Zax.
  10881. - Fix a crash when we fetch a descriptor that turns out to be
  10882. unexpected (it used to be in our networkstatus when we started
  10883. fetching it, but it isn't in our current networkstatus), and we
  10884. aren't using bridges. Bugfix on 0.2.0.x.
  10885. - Fix a crash when accessing hidden services: it would work the first
  10886. time you use a given introduction point for your service, but
  10887. on subsequent requests we'd be using garbage memory. Fixed by
  10888. Karsten Loesing. Bugfix on 0.2.0.13-alpha.
  10889. - Fix a crash when we load a bridge descriptor from disk but we don't
  10890. currently have a Bridge line for it in our torrc. Bugfix on
  10891. 0.2.0.13-alpha.
  10892. o Major features:
  10893. - If bridge authorities set BridgePassword, they will serve a
  10894. snapshot of known bridge routerstatuses from their DirPort to
  10895. anybody who knows that password. Unset by default.
  10896. o Minor bugfixes:
  10897. - Make the unit tests build again.
  10898. - Make "GETINFO/desc-annotations/id/<OR digest>" actually work.
  10899. - Make PublishServerDescriptor default to 1, so the default doesn't
  10900. have to change as we invent new directory protocol versions.
  10901. - Fix test for rlim_t on OSX 10.3: sys/resource.h doesn't want to
  10902. be included unless sys/time.h is already included. Fixes
  10903. bug 553. Bugfix on 0.2.0.x.
  10904. - If we receive a general-purpose descriptor and then receive an
  10905. identical bridge-purpose descriptor soon after, don't discard
  10906. the next one as a duplicate.
  10907. o Minor features:
  10908. - If BridgeRelay is set to 1, then the default for
  10909. PublishServerDescriptor is now "bridge" rather than "v2,v3".
  10910. - If the user sets RelayBandwidthRate but doesn't set
  10911. RelayBandwidthBurst, then make them equal rather than erroring out.
  10912. Changes in version 0.2.0.13-alpha - 2007-12-21
  10913. Tor 0.2.0.13-alpha adds a fourth v3 directory authority run by Geoff
  10914. Goodell, fixes many more bugs, and adds a lot of infrastructure for
  10915. upcoming features.
  10916. o New directory authorities:
  10917. - Set up lefkada (run by Geoff Goodell) as the fourth v3 directory
  10918. authority.
  10919. o Major bugfixes:
  10920. - Only update guard status (usable / not usable) once we have
  10921. enough directory information. This was causing us to always pick
  10922. two new guards on startup (bugfix on 0.2.0.9-alpha), and it was
  10923. causing us to discard all our guards on startup if we hadn't been
  10924. running for a few weeks (bugfix on 0.1.2.x). Fixes bug 448.
  10925. - Purge old entries from the "rephist" database and the hidden
  10926. service descriptor databases even when DirPort is zero. Bugfix
  10927. on 0.1.2.x.
  10928. - We were ignoring our RelayBandwidthRate for the first 30 seconds
  10929. after opening a circuit -- even a relayed circuit. Bugfix on
  10930. 0.2.0.3-alpha.
  10931. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  10932. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  10933. crashing or mis-answering these types of requests.
  10934. - Relays were publishing their server descriptor to v1 and v2
  10935. directory authorities, but they didn't try publishing to v3-only
  10936. authorities. Fix this; and also stop publishing to v1 authorities.
  10937. Bugfix on 0.2.0.x.
  10938. - When we were reading router descriptors from cache, we were ignoring
  10939. the annotations -- so for example we were reading in bridge-purpose
  10940. descriptors as general-purpose descriptors. Bugfix on 0.2.0.8-alpha.
  10941. - When we decided to send a 503 response to a request for servers, we
  10942. were then also sending the server descriptors: this defeats the
  10943. whole purpose. Fixes bug 539; bugfix on 0.1.2.x.
  10944. o Major features:
  10945. - Bridge relays now behave like clients with respect to time
  10946. intervals for downloading new consensus documents -- otherwise they
  10947. stand out. Bridge users now wait until the end of the interval,
  10948. so their bridge relay will be sure to have a new consensus document.
  10949. - Three new config options (AlternateDirAuthority,
  10950. AlternateBridgeAuthority, and AlternateHSAuthority) that let the
  10951. user selectively replace the default directory authorities by type,
  10952. rather than the all-or-nothing replacement that DirServer offers.
  10953. - Tor can now be configured to read a GeoIP file from disk in one
  10954. of two formats. This can be used by controllers to map IP addresses
  10955. to countries. Eventually, it may support exit-by-country.
  10956. - When possible, bridge relays remember which countries users
  10957. are coming from, and report aggregate information in their
  10958. extra-info documents, so that the bridge authorities can learn
  10959. where Tor is blocked.
  10960. - Bridge directory authorities now do reachability testing on the
  10961. bridges they know. They provide router status summaries to the
  10962. controller via "getinfo ns/purpose/bridge", and also dump summaries
  10963. to a file periodically.
  10964. - Stop fetching directory info so aggressively if your DirPort is
  10965. on but your ORPort is off; stop fetching v2 dir info entirely.
  10966. You can override these choices with the new FetchDirInfoEarly
  10967. config option.
  10968. o Minor bugfixes:
  10969. - The fix in 0.2.0.12-alpha cleared the "hsdir" flag in v3 network
  10970. consensus documents when there are too many relays at a single
  10971. IP address. Now clear it in v2 network status documents too, and
  10972. also clear it in routerinfo_t when the relay is no longer listed
  10973. in the relevant networkstatus document.
  10974. - Don't crash if we get an unexpected value for the
  10975. PublishServerDescriptor config option. Reported by Matt Edman;
  10976. bugfix on 0.2.0.9-alpha.
  10977. - Our new v2 hidden service descriptor format allows descriptors
  10978. that have no introduction points. But Tor crashed when we tried
  10979. to build a descriptor with no intro points (and it would have
  10980. crashed if we had tried to parse one). Bugfix on 0.2.0.x; patch
  10981. by Karsten Loesing.
  10982. - Fix building with dmalloc 5.5.2 with glibc.
  10983. - Reject uploaded descriptors and extrainfo documents if they're
  10984. huge. Otherwise we'll cache them all over the network and it'll
  10985. clog everything up. Reported by Aljosha Judmayer.
  10986. - Check for presence of s6_addr16 and s6_addr32 fields in in6_addr
  10987. via autoconf. Should fix compile on solaris. Bugfix on 0.2.0.x.
  10988. - When the DANGEROUS_VERSION controller status event told us we're
  10989. running an obsolete version, it used the string "OLD" to describe
  10990. it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
  10991. "OBSOLETE" in both cases. Bugfix on 0.1.2.x.
  10992. - If we can't expand our list of entry guards (e.g. because we're
  10993. using bridges or we have StrictEntryNodes set), don't mark relays
  10994. down when they fail a directory request. Otherwise we're too quick
  10995. to mark all our entry points down. Bugfix on 0.1.2.x.
  10996. - Fix handling of hex nicknames when answering controller requests for
  10997. networkstatus by name, or when deciding whether to warn about unknown
  10998. routers in a config option. Bugfix on 0.1.2.x. (Patch from mwenge.)
  10999. - Fix a couple of hard-to-trigger autoconf problems that could result
  11000. in really weird results on platforms whose sys/types.h files define
  11001. nonstandard integer types. Bugfix on 0.1.2.x.
  11002. - Fix compilation with --disable-threads set. Bugfix on 0.2.0.x.
  11003. - Don't crash on name lookup when we have no current consensus. Fixes
  11004. bug 538; bugfix on 0.2.0.x.
  11005. - Only Tors that want to mirror the v2 directory info should
  11006. create the "cached-status" directory in their datadir. (All Tors
  11007. used to create it.) Bugfix on 0.2.0.9-alpha.
  11008. - Directory authorities should only automatically download Extra Info
  11009. documents if they're v1, v2, or v3 authorities. Bugfix on 0.1.2.x.
  11010. o Minor features:
  11011. - On the USR1 signal, when dmalloc is in use, log the top 10 memory
  11012. consumers. (We already do this on HUP.)
  11013. - Authorities and caches fetch the v2 networkstatus documents
  11014. less often, now that v3 is encouraged.
  11015. - Add a new config option BridgeRelay that specifies you want to
  11016. be a bridge relay. Right now the only difference is that it makes
  11017. you answer begin_dir requests, and it makes you cache dir info,
  11018. even if your DirPort isn't on.
  11019. - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
  11020. ask about source, timestamp of arrival, purpose, etc. We need
  11021. something like this to help Vidalia not do GeoIP lookups on bridge
  11022. addresses.
  11023. - Allow multiple HashedControlPassword config lines, to support
  11024. multiple controller passwords.
  11025. - Authorities now decide whether they're authoritative for a given
  11026. router based on the router's purpose.
  11027. - New config options AuthDirBadDir and AuthDirListBadDirs for
  11028. authorities to mark certain relays as "bad directories" in the
  11029. networkstatus documents. Also supports the "!baddir" directive in
  11030. the approved-routers file.
  11031. Changes in version 0.2.0.12-alpha - 2007-11-16
  11032. This twelfth development snapshot fixes some more build problems as
  11033. well as a few minor bugs.
  11034. o Compile fixes:
  11035. - Make it build on OpenBSD again. Patch from tup.
  11036. - Substitute BINDIR and LOCALSTATEDIR in scripts. Fixes
  11037. package-building for Red Hat, OS X, etc.
  11038. o Minor bugfixes (on 0.1.2.x):
  11039. - Changing the ExitPolicyRejectPrivate setting should cause us to
  11040. rebuild our server descriptor.
  11041. o Minor bugfixes (on 0.2.0.x):
  11042. - When we're lacking a consensus, don't try to perform rendezvous
  11043. operations. Reported by Karsten Loesing.
  11044. - Fix a small memory leak whenever we decide against using a
  11045. newly picked entry guard. Reported by Mike Perry.
  11046. - When authorities detected more than two relays running on the same
  11047. IP address, they were clearing all the status flags but forgetting
  11048. to clear the "hsdir" flag. So clients were being told that a
  11049. given relay was the right choice for a v2 hsdir lookup, yet they
  11050. never had its descriptor because it was marked as 'not running'
  11051. in the consensus.
  11052. - If we're trying to fetch a bridge descriptor and there's no way
  11053. the bridge authority could help us (for example, we don't know
  11054. a digest, or there is no bridge authority), don't be so eager to
  11055. fall back to asking the bridge authority.
  11056. - If we're using bridges or have strictentrynodes set, and our
  11057. chosen exit is in the same family as all our bridges/entry guards,
  11058. then be flexible about families.
  11059. o Minor features:
  11060. - When we negotiate a v2 link-layer connection (not yet implemented),
  11061. accept RELAY_EARLY cells and turn them into RELAY cells if we've
  11062. negotiated a v1 connection for their next step. Initial code for
  11063. proposal 110.
  11064. Changes in version 0.2.0.11-alpha - 2007-11-12
  11065. This eleventh development snapshot fixes some build problems with
  11066. the previous snapshot. It also includes a more secure-by-default exit
  11067. policy for relays, fixes an enormous memory leak for exit relays, and
  11068. fixes another bug where servers were falling out of the directory list.
  11069. o Security fixes:
  11070. - Exit policies now reject connections that are addressed to a
  11071. relay's public (external) IP address too, unless
  11072. ExitPolicyRejectPrivate is turned off. We do this because too
  11073. many relays are running nearby to services that trust them based
  11074. on network address. Bugfix on 0.1.2.x.
  11075. o Major bugfixes:
  11076. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  11077. on every successful resolve. Reported by Mike Perry; bugfix
  11078. on 0.1.2.x.
  11079. - On authorities, never downgrade to old router descriptors simply
  11080. because they're listed in the consensus. This created a catch-22
  11081. where we wouldn't list a new descriptor because there was an
  11082. old one in the consensus, and we couldn't get the new one in the
  11083. consensus because we wouldn't list it. Possible fix for bug 548.
  11084. Also, this might cause bug 543 to appear on authorities; if so,
  11085. we'll need a band-aid for that. Bugfix on 0.2.0.9-alpha.
  11086. o Packaging fixes on 0.2.0.10-alpha:
  11087. - We were including instructions about what to do with the
  11088. src/config/fallback-consensus file, but we weren't actually
  11089. including it in the tarball. Disable all of that for now.
  11090. o Minor features:
  11091. - Allow people to say PreferTunnelledDirConns rather than
  11092. PreferTunneledDirConns, for those alternate-spellers out there.
  11093. o Minor bugfixes:
  11094. - Don't reevaluate all the information from our consensus document
  11095. just because we've downloaded a v2 networkstatus that we intend
  11096. to cache. Fixes bug 545; bugfix on 0.2.0.x.
  11097. Changes in version 0.2.0.10-alpha - 2007-11-10
  11098. This tenth development snapshot adds a third v3 directory authority
  11099. run by Mike Perry, adds most of Karsten Loesing's new hidden service
  11100. descriptor format, fixes a bad crash bug and new bridge bugs introduced
  11101. in 0.2.0.9-alpha, fixes many bugs with the v3 directory implementation,
  11102. fixes some minor memory leaks in previous 0.2.0.x snapshots, and
  11103. addresses many more minor issues.
  11104. o New directory authorities:
  11105. - Set up ides (run by Mike Perry) as the third v3 directory authority.
  11106. o Major features:
  11107. - Allow tunnelled directory connections to ask for an encrypted
  11108. "begin_dir" connection or an anonymized "uses a full Tor circuit"
  11109. connection independently. Now we can make anonymized begin_dir
  11110. connections for (e.g.) more secure hidden service posting and
  11111. fetching.
  11112. - More progress on proposal 114: code from Karsten Loesing to
  11113. implement new hidden service descriptor format.
  11114. - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
  11115. accommodate the growing number of servers that use the default
  11116. and are reaching it.
  11117. - Directory authorities use a new formula for selecting which nodes
  11118. to advertise as Guards: they must be in the top 7/8 in terms of
  11119. how long we have known about them, and above the median of those
  11120. nodes in terms of weighted fractional uptime.
  11121. - Make "not enough dir info yet" warnings describe *why* Tor feels
  11122. it doesn't have enough directory info yet.
  11123. o Major bugfixes:
  11124. - Stop servers from crashing if they set a Family option (or
  11125. maybe in other situations too). Bugfix on 0.2.0.9-alpha; reported
  11126. by Fabian Keil.
  11127. - Make bridge users work again -- the move to v3 directories in
  11128. 0.2.0.9-alpha had introduced a number of bugs that made bridges
  11129. no longer work for clients.
  11130. - When the clock jumps forward a lot, do not allow the bandwidth
  11131. buckets to become negative. Bugfix on 0.1.2.x; fixes bug 544.
  11132. o Major bugfixes (v3 dir, bugfixes on 0.2.0.9-alpha):
  11133. - When the consensus lists a router descriptor that we previously were
  11134. mirroring, but that we considered non-canonical, reload the
  11135. descriptor as canonical. This fixes bug 543 where Tor servers
  11136. would start complaining after a few days that they don't have
  11137. enough directory information to build a circuit.
  11138. - Consider replacing the current consensus when certificates arrive
  11139. that make the pending consensus valid. Previously, we were only
  11140. considering replacement when the new certs _didn't_ help.
  11141. - Fix an assert error on startup if we didn't already have the
  11142. consensus and certs cached in our datadirectory: we were caching
  11143. the consensus in consensus_waiting_for_certs but then free'ing it
  11144. right after.
  11145. - Avoid sending a request for "keys/fp" (for which we'll get a 400 Bad
  11146. Request) if we need more v3 certs but we've already got pending
  11147. requests for all of them.
  11148. - Correctly back off from failing certificate downloads. Fixes
  11149. bug 546.
  11150. - Authorities don't vote on the Running flag if they have been running
  11151. for less than 30 minutes themselves. Fixes bug 547, where a newly
  11152. started authority would vote that everyone was down.
  11153. o New requirements:
  11154. - Drop support for OpenSSL version 0.9.6. Just about nobody was using
  11155. it, it had no AES, and it hasn't seen any security patches since
  11156. 2004.
  11157. o Minor features:
  11158. - Clients now hold circuitless TLS connections open for 1.5 times
  11159. MaxCircuitDirtiness (15 minutes), since it is likely that they'll
  11160. rebuild a new circuit over them within that timeframe. Previously,
  11161. they held them open only for KeepalivePeriod (5 minutes).
  11162. - Use "If-Modified-Since" to avoid retrieving consensus
  11163. networkstatuses that we already have.
  11164. - When we have no consensus, check FallbackNetworkstatusFile (defaults
  11165. to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
  11166. we start knowing some directory caches.
  11167. - When we receive a consensus from the future, warn about skew.
  11168. - Improve skew reporting: try to give the user a better log message
  11169. about how skewed they are, and how much this matters.
  11170. - When we have a certificate for an authority, believe that
  11171. certificate's claims about the authority's IP address.
  11172. - New --quiet command-line option to suppress the default console log.
  11173. Good in combination with --hash-password.
  11174. - Authorities send back an X-Descriptor-Not-New header in response to
  11175. an accepted-but-discarded descriptor upload. Partially implements
  11176. fix for bug 535.
  11177. - Make the log message for "tls error. breaking." more useful.
  11178. - Better log messages about certificate downloads, to attempt to
  11179. track down the second incarnation of bug 546.
  11180. o Minor features (bridges):
  11181. - If bridge users set UpdateBridgesFromAuthority, but the digest
  11182. they ask for is a 404 from the bridge authority, they now fall
  11183. back to trying the bridge directly.
  11184. - Bridges now use begin_dir to publish their server descriptor to
  11185. the bridge authority, even when they haven't set TunnelDirConns.
  11186. o Minor features (controller):
  11187. - When reporting clock skew, and we know that the clock is _at least
  11188. as skewed_ as some value, but we don't know the actual value,
  11189. report the value as a "minimum skew."
  11190. o Utilities:
  11191. - Update linux-tor-prio.sh script to allow QoS based on the uid of
  11192. the Tor process. Patch from Marco Bonetti with tweaks from Mike
  11193. Perry.
  11194. o Minor bugfixes:
  11195. - Refuse to start if both ORPort and UseBridges are set. Bugfix
  11196. on 0.2.0.x, suggested by Matt Edman.
  11197. - Don't stop fetching descriptors when FetchUselessDescriptors is
  11198. set, even if we stop asking for circuits. Bugfix on 0.1.2.x;
  11199. reported by tup and ioerror.
  11200. - Better log message on vote from unknown authority.
  11201. - Don't log "Launching 0 request for 0 router" message.
  11202. o Minor bugfixes (memory leaks):
  11203. - Stop leaking memory every time we parse a v3 certificate. Bugfix
  11204. on 0.2.0.1-alpha.
  11205. - Stop leaking memory every time we load a v3 certificate. Bugfix
  11206. on 0.2.0.1-alpha. Fixes bug 536.
  11207. - Stop leaking a cached networkstatus on exit. Bugfix on
  11208. 0.2.0.3-alpha.
  11209. - Stop leaking voter information every time we free a consensus.
  11210. Bugfix on 0.2.0.3-alpha.
  11211. - Stop leaking signed data every time we check a voter signature.
  11212. Bugfix on 0.2.0.3-alpha.
  11213. - Stop leaking a signature every time we fail to parse a consensus or
  11214. a vote. Bugfix on 0.2.0.3-alpha.
  11215. - Stop leaking v2_download_status_map on shutdown. Bugfix on
  11216. 0.2.0.9-alpha.
  11217. - Stop leaking conn->nickname every time we make a connection to a
  11218. Tor relay without knowing its expected identity digest (e.g. when
  11219. using bridges). Bugfix on 0.2.0.3-alpha.
  11220. - Minor bugfixes (portability):
  11221. - Run correctly on platforms where rlim_t is larger than unsigned
  11222. long, and/or where the real limit for number of open files is
  11223. OPEN_FILES, not rlim_max from getrlimit(RLIMIT_NOFILES). In
  11224. particular, these may be needed for OS X 10.5.
  11225. Changes in version 0.1.2.18 - 2007-10-28
  11226. Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  11227. hidden service introduction that were causing huge delays, and a big
  11228. bug that was causing some servers to disappear from the network status
  11229. lists for a few hours each day.
  11230. o Major bugfixes (crashes):
  11231. - If a connection is shut down abruptly because of something that
  11232. happened inside connection_flushed_some(), do not call
  11233. connection_finished_flushing(). Should fix bug 451:
  11234. "connection_stop_writing: Assertion conn->write_event failed"
  11235. Bugfix on 0.1.2.7-alpha.
  11236. - Fix possible segfaults in functions called from
  11237. rend_process_relay_cell().
  11238. o Major bugfixes (hidden services):
  11239. - Hidden services were choosing introduction points uniquely by
  11240. hexdigest, but when constructing the hidden service descriptor
  11241. they merely wrote the (potentially ambiguous) nickname.
  11242. - Clients now use the v2 intro format for hidden service
  11243. connections: they specify their chosen rendezvous point by identity
  11244. digest rather than by (potentially ambiguous) nickname. These
  11245. changes could speed up hidden service connections dramatically.
  11246. o Major bugfixes (other):
  11247. - Stop publishing a new server descriptor just because we get a
  11248. HUP signal. This led (in a roundabout way) to some servers getting
  11249. dropped from the networkstatus lists for a few hours each day.
  11250. - When looking for a circuit to cannibalize, consider family as well
  11251. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  11252. circuit cannibalization).
  11253. - When a router wasn't listed in a new networkstatus, we were leaving
  11254. the flags for that router alone -- meaning it remained Named,
  11255. Running, etc -- even though absence from the networkstatus means
  11256. that it shouldn't be considered to exist at all anymore. Now we
  11257. clear all the flags for routers that fall out of the networkstatus
  11258. consensus. Fixes bug 529.
  11259. o Minor bugfixes:
  11260. - Don't try to access (or alter) the state file when running
  11261. --list-fingerprint or --verify-config or --hash-password. Resolves
  11262. bug 499.
  11263. - When generating information telling us how to extend to a given
  11264. router, do not try to include the nickname if it is
  11265. absent. Resolves bug 467.
  11266. - Fix a user-triggerable segfault in expand_filename(). (There isn't
  11267. a way to trigger this remotely.)
  11268. - When sending a status event to the controller telling it that an
  11269. OR address is reachable, set the port correctly. (Previously we
  11270. were reporting the dir port.)
  11271. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  11272. command. Bugfix on 0.1.2.17.
  11273. - When loading bandwidth history, do not believe any information in
  11274. the future. Fixes bug 434.
  11275. - When loading entry guard information, do not believe any information
  11276. in the future.
  11277. - When we have our clock set far in the future and generate an
  11278. onion key, then re-set our clock to be correct, we should not stop
  11279. the onion key from getting rotated.
  11280. - On some platforms, accept() can return a broken address. Detect
  11281. this more quietly, and deal accordingly. Fixes bug 483.
  11282. - It's not actually an error to find a non-pending entry in the DNS
  11283. cache when canceling a pending resolve. Don't log unless stuff
  11284. is fishy. Resolves bug 463.
  11285. - Don't reset trusted dir server list when we set a configuration
  11286. option. Patch from Robert Hogan.
  11287. - Don't try to create the datadir when running --verify-config or
  11288. --hash-password. Resolves bug 540.
  11289. Changes in version 0.2.0.9-alpha - 2007-10-24
  11290. This ninth development snapshot switches clients to the new v3 directory
  11291. system; allows servers to be listed in the network status even when they
  11292. have the same nickname as a registered server; and fixes many other
  11293. bugs including a big one that was causing some servers to disappear
  11294. from the network status lists for a few hours each day.
  11295. o Major features (directory system):
  11296. - Clients now download v3 consensus networkstatus documents instead
  11297. of v2 networkstatus documents. Clients and caches now base their
  11298. opinions about routers on these consensus documents. Clients only
  11299. download router descriptors listed in the consensus.
  11300. - Authorities now list servers who have the same nickname as
  11301. a different named server, but list them with a new flag,
  11302. "Unnamed". Now we can list servers that happen to pick the same
  11303. nickname as a server that registered two years ago and then
  11304. disappeared. Partially implements proposal 122.
  11305. - If the consensus lists a router as "Unnamed", the name is assigned
  11306. to a different router: do not identify the router by that name.
  11307. Partially implements proposal 122.
  11308. - Authorities can now come to a consensus on which method to use to
  11309. compute the consensus. This gives us forward compatibility.
  11310. o Major bugfixes:
  11311. - Stop publishing a new server descriptor just because we HUP or
  11312. when we find our DirPort to be reachable but won't actually publish
  11313. it. New descriptors without any real changes are dropped by the
  11314. authorities, and can screw up our "publish every 18 hours" schedule.
  11315. Bugfix on 0.1.2.x.
  11316. - When a router wasn't listed in a new networkstatus, we were leaving
  11317. the flags for that router alone -- meaning it remained Named,
  11318. Running, etc -- even though absence from the networkstatus means
  11319. that it shouldn't be considered to exist at all anymore. Now we
  11320. clear all the flags for routers that fall out of the networkstatus
  11321. consensus. Fixes bug 529; bugfix on 0.1.2.x.
  11322. - Fix awful behavior in DownloadExtraInfo option where we'd fetch
  11323. extrainfo documents and then discard them immediately for not
  11324. matching the latest router. Bugfix on 0.2.0.1-alpha.
  11325. o Minor features (v3 directory protocol):
  11326. - Allow tor-gencert to generate a new certificate without replacing
  11327. the signing key.
  11328. - Allow certificates to include an address.
  11329. - When we change our directory-cache settings, reschedule all voting
  11330. and download operations.
  11331. - Reattempt certificate downloads immediately on failure, as long as
  11332. we haven't failed a threshold number of times yet.
  11333. - Delay retrying consensus downloads while we're downloading
  11334. certificates to verify the one we just got. Also, count getting a
  11335. consensus that we already have (or one that isn't valid) as a failure,
  11336. and count failing to get the certificates after 20 minutes as a
  11337. failure.
  11338. - Build circuits and download descriptors even if our consensus is a
  11339. little expired. (This feature will go away once authorities are
  11340. more reliable.)
  11341. o Minor features (router descriptor cache):
  11342. - If we find a cached-routers file that's been sitting around for more
  11343. than 28 days unmodified, then most likely it's a leftover from
  11344. when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
  11345. routers anyway.
  11346. - When we (as a cache) download a descriptor because it was listed
  11347. in a consensus, remember when the consensus was supposed to expire,
  11348. and don't expire the descriptor until then.
  11349. o Minor features (performance):
  11350. - Call routerlist_remove_old_routers() much less often. This should
  11351. speed startup, especially on directory caches.
  11352. - Don't try to launch new descriptor downloads quite so often when we
  11353. already have enough directory information to build circuits.
  11354. - Base64 decoding was actually showing up on our profile when parsing
  11355. the initial descriptor file; switch to an in-process all-at-once
  11356. implementation that's about 3.5x times faster than calling out to
  11357. OpenSSL.
  11358. o Minor features (compilation):
  11359. - Detect non-ASCII platforms (if any still exist) and refuse to
  11360. build there: some of our code assumes that 'A' is 65 and so on.
  11361. o Minor bugfixes (v3 directory authorities, bugfixes on 0.2.0.x):
  11362. - Make the "next period" votes into "current period" votes immediately
  11363. after publishing the consensus; avoid a heisenbug that made them
  11364. stick around indefinitely.
  11365. - When we discard a vote as a duplicate, do not report this as
  11366. an error.
  11367. - Treat missing v3 keys or certificates as an error when running as a
  11368. v3 directory authority.
  11369. - When we're configured to be a v3 authority, but we're only listed
  11370. as a non-v3 authority in our DirServer line for ourself, correct
  11371. the listing.
  11372. - If an authority doesn't have a qualified hostname, just put
  11373. its address in the vote. This fixes the problem where we referred to
  11374. "moria on moria:9031."
  11375. - Distinguish between detached signatures for the wrong period, and
  11376. detached signatures for a divergent vote.
  11377. - Fix a small memory leak when computing a consensus.
  11378. - When there's no concensus, we were forming a vote every 30
  11379. minutes, but writing the "valid-after" line in our vote based
  11380. on our configured V3AuthVotingInterval: so unless the intervals
  11381. matched up, we immediately rejected our own vote because it didn't
  11382. start at the voting interval that caused us to construct a vote.
  11383. o Minor bugfixes (v3 directory protocol, bugfixes on 0.2.0.x):
  11384. - Delete unverified-consensus when the real consensus is set.
  11385. - Consider retrying a consensus networkstatus fetch immediately
  11386. after one fails: don't wait 60 seconds to notice.
  11387. - When fetching a consensus as a cache, wait until a newer consensus
  11388. should exist before trying to replace the current one.
  11389. - Use a more forgiving schedule for retrying failed consensus
  11390. downloads than for other types.
  11391. o Minor bugfixes (other directory issues):
  11392. - Correct the implementation of "download votes by digest." Bugfix on
  11393. 0.2.0.8-alpha.
  11394. - Authorities no longer send back "400 you're unreachable please fix
  11395. it" errors to Tor servers that aren't online all the time. We're
  11396. supposed to tolerate these servers now. Bugfix on 0.1.2.x.
  11397. o Minor bugfixes (controller):
  11398. - Don't reset trusted dir server list when we set a configuration
  11399. option. Patch from Robert Hogan; bugfix on 0.1.2.x.
  11400. - Respond to INT and TERM SIGNAL commands before we execute the
  11401. signal, in case the signal shuts us down. We had a patch in
  11402. 0.1.2.1-alpha that tried to do this by queueing the response on
  11403. the connection's buffer before shutting down, but that really
  11404. isn't the same thing at all. Bug located by Matt Edman.
  11405. o Minor bugfixes (misc):
  11406. - Correctly check for bad options to the "PublishServerDescriptor"
  11407. config option. Bugfix on 0.2.0.1-alpha; reported by Matt Edman.
  11408. - Stop leaking memory on failing case of base32_decode, and make
  11409. it accept upper-case letters. Bugfixes on 0.2.0.7-alpha.
  11410. - Don't try to download extrainfo documents when we're trying to
  11411. fetch enough directory info to build a circuit: having enough
  11412. info should get priority. Bugfix on 0.2.0.x.
  11413. - Don't complain that "your server has not managed to confirm that its
  11414. ports are reachable" if we haven't been able to build any circuits
  11415. yet. Bug found by spending four hours without a v3 consensus. Bugfix
  11416. on 0.1.2.x.
  11417. - Detect the reason for failing to mmap a descriptor file we just
  11418. wrote, and give a more useful log message. Fixes bug 533. Bugfix
  11419. on 0.1.2.x.
  11420. o Code simplifications and refactoring:
  11421. - Remove support for the old bw_accounting file: we've been storing
  11422. bandwidth accounting information in the state file since
  11423. 0.1.2.5-alpha. This may result in bandwidth accounting errors
  11424. if you try to upgrade from 0.1.1.x or earlier, or if you try to
  11425. downgrade to 0.1.1.x or earlier.
  11426. - New convenience code to locate a file within the DataDirectory.
  11427. - Move non-authority functionality out of dirvote.c.
  11428. - Refactor the arguments for router_pick_{directory_|trusteddir}server
  11429. so that they all take the same named flags.
  11430. o Utilities
  11431. - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
  11432. Unix users an easy way to script their Tor process (e.g. by
  11433. adjusting bandwidth based on the time of the day).
  11434. Changes in version 0.2.0.8-alpha - 2007-10-12
  11435. This eighth development snapshot fixes a crash bug that's been bothering
  11436. us since February 2007, lets bridge authorities store a list of bridge
  11437. descriptors they've seen, gets v3 directory voting closer to working,
  11438. starts caching v3 directory consensus documents on directory mirrors,
  11439. and fixes a variety of smaller issues including some minor memory leaks.
  11440. o Major features (router descriptor cache):
  11441. - Store routers in a file called cached-descriptors instead of in
  11442. cached-routers. Initialize cached-descriptors from cached-routers
  11443. if the old format is around. The new format allows us to store
  11444. annotations along with descriptors.
  11445. - Use annotations to record the time we received each descriptor, its
  11446. source, and its purpose.
  11447. - Disable the SETROUTERPURPOSE controller command: it is now
  11448. obsolete.
  11449. - Controllers should now specify cache=no or cache=yes when using
  11450. the +POSTDESCRIPTOR command.
  11451. - Bridge authorities now write bridge descriptors to disk, meaning
  11452. we can export them to other programs and begin distributing them
  11453. to blocked users.
  11454. o Major features (directory authorities):
  11455. - When a v3 authority is missing votes or signatures, it now tries
  11456. to fetch them.
  11457. - Directory authorities track weighted fractional uptime as well as
  11458. weighted mean-time-between failures. WFU is suitable for deciding
  11459. whether a node is "usually up", while MTBF is suitable for deciding
  11460. whether a node is "likely to stay up." We need both, because
  11461. "usually up" is a good requirement for guards, while "likely to
  11462. stay up" is a good requirement for long-lived connections.
  11463. o Major features (v3 directory system):
  11464. - Caches now download v3 network status documents as needed,
  11465. and download the descriptors listed in them.
  11466. - All hosts now attempt to download and keep fresh v3 authority
  11467. certificates, and re-attempt after failures.
  11468. - More internal-consistency checks for vote parsing.
  11469. o Major bugfixes (crashes):
  11470. - If a connection is shut down abruptly because of something that
  11471. happened inside connection_flushed_some(), do not call
  11472. connection_finished_flushing(). Should fix bug 451. Bugfix on
  11473. 0.1.2.7-alpha.
  11474. o Major bugfixes (performance):
  11475. - Fix really bad O(n^2) performance when parsing a long list of
  11476. routers: Instead of searching the entire list for an "extra-info "
  11477. string which usually wasn't there, once for every routerinfo
  11478. we read, just scan lines forward until we find one we like.
  11479. Bugfix on 0.2.0.1.
  11480. - When we add data to a write buffer in response to the data on that
  11481. write buffer getting low because of a flush, do not consider the
  11482. newly added data as a candidate for immediate flushing, but rather
  11483. make it wait until the next round of writing. Otherwise, we flush
  11484. and refill recursively, and a single greedy TLS connection can
  11485. eat all of our bandwidth. Bugfix on 0.1.2.7-alpha.
  11486. o Minor features (v3 authority system):
  11487. - Add more ways for tools to download the votes that lead to the
  11488. current consensus.
  11489. - Send a 503 when low on bandwidth and a vote, consensus, or
  11490. certificate is requested.
  11491. - If-modified-since is now implemented properly for all kinds of
  11492. certificate requests.
  11493. o Minor bugfixes (network statuses):
  11494. - Tweak the implementation of proposal 109 slightly: allow at most
  11495. two Tor servers on the same IP address, except if it's the location
  11496. of a directory authority, in which case allow five. Bugfix on
  11497. 0.2.0.3-alpha.
  11498. o Minor bugfixes (controller):
  11499. - When sending a status event to the controller telling it that an
  11500. OR address is reachable, set the port correctly. (Previously we
  11501. were reporting the dir port.) Bugfix on 0.1.2.x.
  11502. o Minor bugfixes (v3 directory system):
  11503. - Fix logic to look up a cert by its signing key digest. Bugfix on
  11504. 0.2.0.7-alpha.
  11505. - Only change the reply to a vote to "OK" if it's not already
  11506. set. This gets rid of annoying "400 OK" log messages, which may
  11507. have been masking some deeper issue. Bugfix on 0.2.0.7-alpha.
  11508. - When we get a valid consensus, recompute the voting schedule.
  11509. - Base the valid-after time of a vote on the consensus voting
  11510. schedule, not on our preferred schedule.
  11511. - Make the return values and messages from signature uploads and
  11512. downloads more sensible.
  11513. - Fix a memory leak when serving votes and consensus documents, and
  11514. another when serving certificates.
  11515. o Minor bugfixes (performance):
  11516. - Use a slightly simpler string hashing algorithm (copying Python's
  11517. instead of Java's) and optimize our digest hashing algorithm to take
  11518. advantage of 64-bit platforms and to remove some possibly-costly
  11519. voodoo.
  11520. - Fix a minor memory leak whenever we parse guards from our state
  11521. file. Bugfix on 0.2.0.7-alpha.
  11522. - Fix a minor memory leak whenever we write out a file. Bugfix on
  11523. 0.2.0.7-alpha.
  11524. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  11525. command. Bugfix on 0.2.0.5-alpha.
  11526. o Minor bugfixes (portability):
  11527. - On some platforms, accept() can return a broken address. Detect
  11528. this more quietly, and deal accordingly. Fixes bug 483.
  11529. - Stop calling tor_strlower() on uninitialized memory in some cases.
  11530. Bugfix in 0.2.0.7-alpha.
  11531. o Minor bugfixes (usability):
  11532. - Treat some 403 responses from directory servers as INFO rather than
  11533. WARN-severity events.
  11534. - It's not actually an error to find a non-pending entry in the DNS
  11535. cache when canceling a pending resolve. Don't log unless stuff is
  11536. fishy. Resolves bug 463.
  11537. o Minor bugfixes (anonymity):
  11538. - Never report that we've used more bandwidth than we're willing to
  11539. relay: it leaks how much non-relay traffic we're using. Resolves
  11540. bug 516.
  11541. - When looking for a circuit to cannibalize, consider family as well
  11542. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  11543. circuit cannibalization).
  11544. o Code simplifications and refactoring:
  11545. - Make a bunch of functions static. Remove some dead code.
  11546. - Pull out about a third of the really big routerlist.c; put it in a
  11547. new module, networkstatus.c.
  11548. - Merge the extra fields in local_routerstatus_t back into
  11549. routerstatus_t: we used to need one routerstatus_t for each
  11550. authority's opinion, plus a local_routerstatus_t for the locally
  11551. computed consensus opinion. To save space, we put the locally
  11552. modified fields into local_routerstatus_t, and only the common
  11553. stuff into routerstatus_t. But once v3 directories are in use,
  11554. clients and caches will no longer need to hold authority opinions;
  11555. thus, the rationale for keeping the types separate is now gone.
  11556. - Make the code used to reschedule and reattempt downloads more
  11557. uniform.
  11558. - Turn all 'Are we a directory server/mirror?' logic into a call to
  11559. dirserver_mode().
  11560. - Remove the code to generate the oldest (v1) directory format.
  11561. The code has been disabled since 0.2.0.5-alpha.
  11562. Changes in version 0.2.0.7-alpha - 2007-09-21
  11563. This seventh development snapshot makes bridges work again, makes bridge
  11564. authorities work for the first time, fixes two huge performance flaws
  11565. in hidden services, and fixes a variety of minor issues.
  11566. o New directory authorities:
  11567. - Set up moria1 and tor26 as the first v3 directory authorities. See
  11568. doc/spec/dir-spec.txt for details on the new directory design.
  11569. o Major bugfixes (crashes):
  11570. - Fix possible segfaults in functions called from
  11571. rend_process_relay_cell(). Bugfix on 0.1.2.x.
  11572. o Major bugfixes (bridges):
  11573. - Fix a bug that made servers send a "404 Not found" in response to
  11574. attempts to fetch their server descriptor. This caused Tor servers
  11575. to take many minutes to establish reachability for their DirPort,
  11576. and it totally crippled bridges. Bugfix on 0.2.0.5-alpha.
  11577. - Make "UpdateBridgesFromAuthority" torrc option work: when bridge
  11578. users configure that and specify a bridge with an identity
  11579. fingerprint, now they will lookup the bridge descriptor at the
  11580. default bridge authority via a one-hop tunnel, but once circuits
  11581. are established they will switch to a three-hop tunnel for later
  11582. connections to the bridge authority. Bugfix in 0.2.0.3-alpha.
  11583. o Major bugfixes (hidden services):
  11584. - Hidden services were choosing introduction points uniquely by
  11585. hexdigest, but when constructing the hidden service descriptor
  11586. they merely wrote the (potentially ambiguous) nickname.
  11587. - Clients now use the v2 intro format for hidden service
  11588. connections: they specify their chosen rendezvous point by identity
  11589. digest rather than by (potentially ambiguous) nickname. Both
  11590. are bugfixes on 0.1.2.x, and they could speed up hidden service
  11591. connections dramatically. Thanks to Karsten Loesing.
  11592. o Minor features (security):
  11593. - As a client, do not believe any server that tells us that an
  11594. address maps to an internal address space.
  11595. - Make it possible to enable HashedControlPassword and
  11596. CookieAuthentication at the same time.
  11597. o Minor features (guard nodes):
  11598. - Tag every guard node in our state file with the version that
  11599. we believe added it, or with our own version if we add it. This way,
  11600. if a user temporarily runs an old version of Tor and then switches
  11601. back to a new one, she doesn't automatically lose her guards.
  11602. o Minor features (speed):
  11603. - When implementing AES counter mode, update only the portions of the
  11604. counter buffer that need to change, and don't keep separate
  11605. network-order and host-order counters when they are the same (i.e.,
  11606. on big-endian hosts.)
  11607. o Minor features (controller):
  11608. - Accept LF instead of CRLF on controller, since some software has a
  11609. hard time generating real Internet newlines.
  11610. - Add GETINFO values for the server status events
  11611. "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
  11612. Robert Hogan.
  11613. o Removed features:
  11614. - Routers no longer include bandwidth-history lines in their
  11615. descriptors; this information is already available in extra-info
  11616. documents, and including it in router descriptors took up 60%
  11617. (!) of compressed router descriptor downloads. Completes
  11618. implementation of proposal 104.
  11619. - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
  11620. and TorControl.py, as they use the old v0 controller protocol,
  11621. and are obsoleted by TorFlow anyway.
  11622. - Drop support for v1 rendezvous descriptors, since we never used
  11623. them anyway, and the code has probably rotted by now. Based on
  11624. patch from Karsten Loesing.
  11625. - On OSX, stop warning the user that kqueue support in libevent is
  11626. "experimental", since it seems to have worked fine for ages.
  11627. o Minor bugfixes:
  11628. - When generating information telling us how to extend to a given
  11629. router, do not try to include the nickname if it is absent. Fixes
  11630. bug 467. Bugfix on 0.2.0.3-alpha.
  11631. - Fix a user-triggerable (but not remotely-triggerable) segfault
  11632. in expand_filename(). Bugfix on 0.1.2.x.
  11633. - Fix a memory leak when freeing incomplete requests from DNSPort.
  11634. Found by Niels Provos with valgrind. Bugfix on 0.2.0.1-alpha.
  11635. - Don't try to access (or alter) the state file when running
  11636. --list-fingerprint or --verify-config or --hash-password. (Resolves
  11637. bug 499.) Bugfix on 0.1.2.x.
  11638. - Servers used to decline to publish their DirPort if their
  11639. BandwidthRate, RelayBandwidthRate, or MaxAdvertisedBandwidth
  11640. were below a threshold. Now they only look at BandwidthRate and
  11641. RelayBandwidthRate. Bugfix on 0.1.2.x.
  11642. - Remove an optimization in the AES counter-mode code that assumed
  11643. that the counter never exceeded 2^68. When the counter can be set
  11644. arbitrarily as an IV (as it is by Karsten's new hidden services
  11645. code), this assumption no longer holds. Bugfix on 0.1.2.x.
  11646. - Resume listing "AUTHORITY" flag for authorities in network status.
  11647. Bugfix on 0.2.0.3-alpha; reported by Alex de Joode.
  11648. o Code simplifications and refactoring:
  11649. - Revamp file-writing logic so we don't need to have the entire
  11650. contents of a file in memory at once before we write to disk. Tor,
  11651. meet stdio.
  11652. - Turn "descriptor store" into a full-fledged type.
  11653. - Move all NT services code into a separate source file.
  11654. - Unify all code that computes medians, percentile elements, etc.
  11655. - Get rid of a needless malloc when parsing address policies.
  11656. Changes in version 0.1.2.17 - 2007-08-30
  11657. Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  11658. X bundles. Vidalia 0.0.14 makes authentication required for the
  11659. ControlPort in the default configuration, which addresses important
  11660. security risks. Everybody who uses Vidalia (or another controller)
  11661. should upgrade.
  11662. In addition, this Tor update fixes major load balancing problems with
  11663. path selection, which should speed things up a lot once many people
  11664. have upgraded.
  11665. o Major bugfixes (security):
  11666. - We removed support for the old (v0) control protocol. It has been
  11667. deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
  11668. become more of a headache than it's worth.
  11669. o Major bugfixes (load balancing):
  11670. - When choosing nodes for non-guard positions, weight guards
  11671. proportionally less, since they already have enough load. Patch
  11672. from Mike Perry.
  11673. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  11674. will allow fast Tor servers to get more attention.
  11675. - When we're upgrading from an old Tor version, forget our current
  11676. guards and pick new ones according to the new weightings. These
  11677. three load balancing patches could raise effective network capacity
  11678. by a factor of four. Thanks to Mike Perry for measurements.
  11679. o Major bugfixes (stream expiration):
  11680. - Expire not-yet-successful application streams in all cases if
  11681. they've been around longer than SocksTimeout. Right now there are
  11682. some cases where the stream will live forever, demanding a new
  11683. circuit every 15 seconds. Fixes bug 454; reported by lodger.
  11684. o Minor features (controller):
  11685. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  11686. is valid before any authentication has been received. It tells
  11687. a controller what kind of authentication is expected, and what
  11688. protocol is spoken. Implements proposal 119.
  11689. o Minor bugfixes (performance):
  11690. - Save on most routerlist_assert_ok() calls in routerlist.c, thus
  11691. greatly speeding up loading cached-routers from disk on startup.
  11692. - Disable sentinel-based debugging for buffer code: we squashed all
  11693. the bugs that this was supposed to detect a long time ago, and now
  11694. its only effect is to change our buffer sizes from nice powers of
  11695. two (which platform mallocs tend to like) to values slightly over
  11696. powers of two (which make some platform mallocs sad).
  11697. o Minor bugfixes (misc):
  11698. - If exit bandwidth ever exceeds one third of total bandwidth, then
  11699. use the correct formula to weight exit nodes when choosing paths.
  11700. Based on patch from Mike Perry.
  11701. - Choose perfectly fairly among routers when choosing by bandwidth and
  11702. weighting by fraction of bandwidth provided by exits. Previously, we
  11703. would choose with only approximate fairness, and correct ourselves
  11704. if we ran off the end of the list.
  11705. - If we require CookieAuthentication but we fail to write the
  11706. cookie file, we would warn but not exit, and end up in a state
  11707. where no controller could authenticate. Now we exit.
  11708. - If we require CookieAuthentication, stop generating a new cookie
  11709. every time we change any piece of our config.
  11710. - Refuse to start with certain directory authority keys, and
  11711. encourage people using them to stop.
  11712. - Terminate multi-line control events properly. Original patch
  11713. from tup.
  11714. - Fix a minor memory leak when we fail to find enough suitable
  11715. servers to choose a circuit.
  11716. - Stop leaking part of the descriptor when we run into a particularly
  11717. unparseable piece of it.
  11718. Changes in version 0.2.0.6-alpha - 2007-08-26
  11719. This sixth development snapshot features a new Vidalia version in the
  11720. Windows and OS X bundles. Vidalia 0.0.14 makes authentication required for
  11721. the ControlPort in the default configuration, which addresses important
  11722. security risks.
  11723. In addition, this snapshot fixes major load balancing problems
  11724. with path selection, which should speed things up a lot once many
  11725. people have upgraded. The directory authorities also use a new
  11726. mean-time-between-failure approach to tracking which servers are stable,
  11727. rather than just looking at the most recent uptime.
  11728. o New directory authorities:
  11729. - Set up Tonga as the default bridge directory authority.
  11730. o Major features:
  11731. - Directory authorities now track servers by weighted
  11732. mean-times-between-failures. When we have 4 or more days of data,
  11733. use measured MTBF rather than declared uptime to decide whether
  11734. to call a router Stable. Implements proposal 108.
  11735. o Major bugfixes (load balancing):
  11736. - When choosing nodes for non-guard positions, weight guards
  11737. proportionally less, since they already have enough load. Patch
  11738. from Mike Perry.
  11739. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  11740. will allow fast Tor servers to get more attention.
  11741. - When we're upgrading from an old Tor version, forget our current
  11742. guards and pick new ones according to the new weightings. These
  11743. three load balancing patches could raise effective network capacity
  11744. by a factor of four. Thanks to Mike Perry for measurements.
  11745. o Major bugfixes (descriptor parsing):
  11746. - Handle unexpected whitespace better in malformed descriptors. Bug
  11747. found using Benedikt Boss's new Tor fuzzer! Bugfix on 0.2.0.x.
  11748. o Minor features:
  11749. - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
  11750. GETINFO for Torstat to use until it can switch to using extrainfos.
  11751. - Optionally (if built with -DEXPORTMALLINFO) export the output
  11752. of mallinfo via http, as tor/mallinfo.txt. Only accessible
  11753. from localhost.
  11754. o Minor bugfixes:
  11755. - Do not intermix bridge routers with controller-added
  11756. routers. (Bugfix on 0.2.0.x)
  11757. - Do not fail with an assert when accept() returns an unexpected
  11758. address family. Addresses but does not wholly fix bug 483. (Bugfix
  11759. on 0.2.0.x)
  11760. - Let directory authorities startup even when they can't generate
  11761. a descriptor immediately, e.g. because they don't know their
  11762. address.
  11763. - Stop putting the authentication cookie in a file called "0"
  11764. in your working directory if you don't specify anything for the
  11765. new CookieAuthFile option. Reported by Matt Edman.
  11766. - Make it possible to read the PROTOCOLINFO response in a way that
  11767. conforms to our control-spec. Reported by Matt Edman.
  11768. - Fix a minor memory leak when we fail to find enough suitable
  11769. servers to choose a circuit. Bugfix on 0.1.2.x.
  11770. - Stop leaking part of the descriptor when we run into a particularly
  11771. unparseable piece of it. Bugfix on 0.1.2.x.
  11772. - Unmap the extrainfo cache file on exit.
  11773. Changes in version 0.2.0.5-alpha - 2007-08-19
  11774. This fifth development snapshot fixes compilation on Windows again;
  11775. fixes an obnoxious client-side bug that slowed things down and put
  11776. extra load on the network; gets us closer to using the v3 directory
  11777. voting scheme; makes it easier for Tor controllers to use cookie-based
  11778. authentication; and fixes a variety of other bugs.
  11779. o Removed features:
  11780. - Version 1 directories are no longer generated in full. Instead,
  11781. authorities generate and serve "stub" v1 directories that list
  11782. no servers. This will stop Tor versions 0.1.0.x and earlier from
  11783. working, but (for security reasons) nobody should be running those
  11784. versions anyway.
  11785. o Major bugfixes (compilation, 0.2.0.x):
  11786. - Try to fix Win32 compilation again: improve checking for IPv6 types.
  11787. - Try to fix MSVC compilation: build correctly on platforms that do
  11788. not define s6_addr16 or s6_addr32.
  11789. - Fix compile on platforms without getaddrinfo: bug found by Li-Hui
  11790. Zhou.
  11791. o Major bugfixes (stream expiration):
  11792. - Expire not-yet-successful application streams in all cases if
  11793. they've been around longer than SocksTimeout. Right now there are
  11794. some cases where the stream will live forever, demanding a new
  11795. circuit every 15 seconds. Bugfix on 0.1.2.7-alpha; fixes bug 454;
  11796. reported by lodger.
  11797. o Minor features (directory servers):
  11798. - When somebody requests a list of statuses or servers, and we have
  11799. none of those, return a 404 rather than an empty 200.
  11800. o Minor features (directory voting):
  11801. - Store v3 consensus status consensuses on disk, and reload them
  11802. on startup.
  11803. o Minor features (security):
  11804. - Warn about unsafe ControlPort configurations.
  11805. - Refuse to start with certain directory authority keys, and
  11806. encourage people using them to stop.
  11807. o Minor features (controller):
  11808. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  11809. is valid before any authentication has been received. It tells
  11810. a controller what kind of authentication is expected, and what
  11811. protocol is spoken. Implements proposal 119.
  11812. - New config option CookieAuthFile to choose a new location for the
  11813. cookie authentication file, and config option
  11814. CookieAuthFileGroupReadable to make it group-readable.
  11815. o Minor features (unit testing):
  11816. - Add command-line arguments to unit-test executable so that we can
  11817. invoke any chosen test from the command line rather than having
  11818. to run the whole test suite at once; and so that we can turn on
  11819. logging for the unit tests.
  11820. o Minor bugfixes (on 0.1.2.x):
  11821. - If we require CookieAuthentication but we fail to write the
  11822. cookie file, we would warn but not exit, and end up in a state
  11823. where no controller could authenticate. Now we exit.
  11824. - If we require CookieAuthentication, stop generating a new cookie
  11825. every time we change any piece of our config.
  11826. - When loading bandwidth history, do not believe any information in
  11827. the future. Fixes bug 434.
  11828. - When loading entry guard information, do not believe any information
  11829. in the future.
  11830. - When we have our clock set far in the future and generate an
  11831. onion key, then re-set our clock to be correct, we should not stop
  11832. the onion key from getting rotated.
  11833. - Clean up torrc sample config file.
  11834. - Do not automatically run configure from autogen.sh. This
  11835. non-standard behavior tended to annoy people who have built other
  11836. programs.
  11837. o Minor bugfixes (on 0.2.0.x):
  11838. - Fix a bug with AutomapHostsOnResolve that would always cause
  11839. the second request to fail. Bug reported by Kate. Bugfix on
  11840. 0.2.0.3-alpha.
  11841. - Fix a bug in ADDRMAP controller replies that would sometimes
  11842. try to print a NULL. Patch from tup.
  11843. - Read v3 directory authority keys from the right location.
  11844. - Numerous bugfixes to directory voting code.
  11845. Changes in version 0.1.2.16 - 2007-08-01
  11846. Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  11847. remote attacker in certain situations to rewrite the user's torrc
  11848. configuration file. This can completely compromise anonymity of users
  11849. in most configurations, including those running the Vidalia bundles,
  11850. TorK, etc. Or worse.
  11851. o Major security fixes:
  11852. - Close immediately after missing authentication on control port;
  11853. do not allow multiple authentication attempts.
  11854. Changes in version 0.2.0.4-alpha - 2007-08-01
  11855. This fourth development snapshot fixes a critical security vulnerability
  11856. for most users, specifically those running Vidalia, TorK, etc. Everybody
  11857. should upgrade to either 0.1.2.16 or 0.2.0.4-alpha.
  11858. o Major security fixes:
  11859. - Close immediately after missing authentication on control port;
  11860. do not allow multiple authentication attempts.
  11861. o Major bugfixes (compilation):
  11862. - Fix win32 compilation: apparently IN_ADDR and IN6_ADDR are already
  11863. defined there.
  11864. o Minor features (performance):
  11865. - Be even more aggressive about releasing RAM from small
  11866. empty buffers. Thanks to our free-list code, this shouldn't be too
  11867. performance-intensive.
  11868. - Disable sentinel-based debugging for buffer code: we squashed all
  11869. the bugs that this was supposed to detect a long time ago, and
  11870. now its only effect is to change our buffer sizes from nice
  11871. powers of two (which platform mallocs tend to like) to values
  11872. slightly over powers of two (which make some platform mallocs sad).
  11873. - Log malloc statistics from mallinfo() on platforms where it
  11874. exists.
  11875. Changes in version 0.2.0.3-alpha - 2007-07-29
  11876. This third development snapshot introduces new experimental
  11877. blocking-resistance features and a preliminary version of the v3
  11878. directory voting design, and includes many other smaller features
  11879. and bugfixes.
  11880. o Major features:
  11881. - The first pieces of our "bridge" design for blocking-resistance
  11882. are implemented. People can run bridge directory authorities;
  11883. people can run bridges; and people can configure their Tor clients
  11884. with a set of bridges to use as the first hop into the Tor network.
  11885. See http://archives.seul.org/or/talk/Jul-2007/msg00249.html for
  11886. details.
  11887. - Create listener connections before we setuid to the configured
  11888. User and Group. Now non-Windows users can choose port values
  11889. under 1024, start Tor as root, and have Tor bind those ports
  11890. before it changes to another UID. (Windows users could already
  11891. pick these ports.)
  11892. - Added a new ConstrainedSockets config option to set SO_SNDBUF and
  11893. SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
  11894. on "vserver" accounts. (Patch from coderman.)
  11895. - Be even more aggressive about separating local traffic from relayed
  11896. traffic when RelayBandwidthRate is set. (Refines proposal 111.)
  11897. o Major features (experimental):
  11898. - First cut of code for "v3 dir voting": directory authorities will
  11899. vote on a common network status document rather than each publishing
  11900. their own opinion. This code needs more testing and more corner-case
  11901. handling before it's ready for use.
  11902. o Security fixes:
  11903. - Directory authorities now call routers Fast if their bandwidth is
  11904. at least 100KB/s, and consider their bandwidth adequate to be a
  11905. Guard if it is at least 250KB/s, no matter the medians. This fix
  11906. complements proposal 107. [Bugfix on 0.1.2.x]
  11907. - Directory authorities now never mark more than 3 servers per IP as
  11908. Valid and Running. (Implements proposal 109, by Kevin Bauer and
  11909. Damon McCoy.)
  11910. - Minor change to organizationName and commonName generation
  11911. procedures in TLS certificates during Tor handshakes, to invalidate
  11912. some earlier censorware approaches. This is not a long-term
  11913. solution, but applying it will give us a bit of time to look into
  11914. the epidemiology of countermeasures as they spread.
  11915. o Major bugfixes (directory):
  11916. - Rewrite directory tokenization code to never run off the end of
  11917. a string. Fixes bug 455. Patch from croup. [Bugfix on 0.1.2.x]
  11918. o Minor features (controller):
  11919. - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
  11920. match requests to applications. (Patch from Robert Hogan.)
  11921. - Report address and port correctly on connections to DNSPort. (Patch
  11922. from Robert Hogan.)
  11923. - Add a RESOLVE command to launch hostname lookups. (Original patch
  11924. from Robert Hogan.)
  11925. - Add GETINFO status/enough-dir-info to let controllers tell whether
  11926. Tor has downloaded sufficient directory information. (Patch
  11927. from Tup.)
  11928. - You can now use the ControlSocket option to tell Tor to listen for
  11929. controller connections on Unix domain sockets on systems that
  11930. support them. (Patch from Peter Palfrader.)
  11931. - STREAM NEW events are generated for DNSPort requests and for
  11932. tunneled directory connections. (Patch from Robert Hogan.)
  11933. - New "GETINFO address-mappings/*" command to get address mappings
  11934. with expiry information. "addr-mappings/*" is now deprecated.
  11935. (Patch from Tup.)
  11936. o Minor features (misc):
  11937. - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
  11938. from croup.)
  11939. - The tor-gencert tool for v3 directory authorities now creates all
  11940. files as readable to the file creator only, and write-protects
  11941. the authority identity key.
  11942. - When dumping memory usage, list bytes used in buffer memory
  11943. free-lists.
  11944. - When running with dmalloc, dump more stats on hup and on exit.
  11945. - Directory authorities now fail quickly and (relatively) harmlessly
  11946. if they generate a network status document that is somehow
  11947. malformed.
  11948. o Traffic load balancing improvements:
  11949. - If exit bandwidth ever exceeds one third of total bandwidth, then
  11950. use the correct formula to weight exit nodes when choosing paths.
  11951. (Based on patch from Mike Perry.)
  11952. - Choose perfectly fairly among routers when choosing by bandwidth and
  11953. weighting by fraction of bandwidth provided by exits. Previously, we
  11954. would choose with only approximate fairness, and correct ourselves
  11955. if we ran off the end of the list. [Bugfix on 0.1.2.x]
  11956. o Performance improvements:
  11957. - Be more aggressive with freeing buffer RAM or putting it on the
  11958. memory free lists.
  11959. - Use Critical Sections rather than Mutexes for synchronizing threads
  11960. on win32; Mutexes are heavier-weight, and designed for synchronizing
  11961. between processes.
  11962. o Deprecated and removed features:
  11963. - RedirectExits is now deprecated.
  11964. - Stop allowing address masks that do not correspond to bit prefixes.
  11965. We have warned about these for a really long time; now it's time
  11966. to reject them. (Patch from croup.)
  11967. o Minor bugfixes (directory):
  11968. - Fix another crash bug related to extra-info caching. (Bug found by
  11969. Peter Palfrader.) [Bugfix on 0.2.0.2-alpha]
  11970. - Directories no longer return a "304 not modified" when they don't
  11971. have the networkstatus the client asked for. Also fix a memory
  11972. leak when returning 304 not modified. [Bugfixes on 0.2.0.2-alpha]
  11973. - We had accidentally labelled 0.1.2.x directory servers as not
  11974. suitable for begin_dir requests, and had labelled no directory
  11975. servers as suitable for uploading extra-info documents. [Bugfix
  11976. on 0.2.0.1-alpha]
  11977. o Minor bugfixes (dns):
  11978. - Fix a crash when DNSPort is set more than once. (Patch from Robert
  11979. Hogan.) [Bugfix on 0.2.0.2-alpha]
  11980. - Add DNSPort connections to the global connection list, so that we
  11981. can time them out correctly. (Bug found by Robert Hogan.) [Bugfix
  11982. on 0.2.0.2-alpha]
  11983. - Fix a dangling reference that could lead to a crash when DNSPort is
  11984. changed or closed (Patch from Robert Hogan.) [Bugfix on
  11985. 0.2.0.2-alpha]
  11986. o Minor bugfixes (controller):
  11987. - Provide DNS expiry times in GMT, not in local time. For backward
  11988. compatibility, ADDRMAP events only provide GMT expiry in an extended
  11989. field. "GETINFO address-mappings" always does the right thing.
  11990. - Use CRLF line endings properly in NS events.
  11991. - Terminate multi-line control events properly. (Original patch
  11992. from tup.) [Bugfix on 0.1.2.x-alpha]
  11993. - Do not include spaces in SOURCE_ADDR fields in STREAM
  11994. events. Resolves bug 472. [Bugfix on 0.2.0.x-alpha]
  11995. Changes in version 0.1.2.15 - 2007-07-17
  11996. Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  11997. problems, fixes compilation on BSD, and fixes a variety of other
  11998. bugs. Everybody should upgrade.
  11999. o Major bugfixes (compilation):
  12000. - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
  12001. o Major bugfixes (crashes):
  12002. - Try even harder not to dereference the first character after
  12003. an mmap(). Reported by lodger.
  12004. - Fix a crash bug in directory authorities when we re-number the
  12005. routerlist while inserting a new router.
  12006. - When the cached-routers file is an even multiple of the page size,
  12007. don't run off the end and crash. (Fixes bug 455; based on idea
  12008. from croup.)
  12009. - Fix eventdns.c behavior on Solaris: It is critical to include
  12010. orconfig.h _before_ sys/types.h, so that we can get the expected
  12011. definition of _FILE_OFFSET_BITS.
  12012. o Major bugfixes (security):
  12013. - Fix a possible buffer overrun when using BSD natd support. Bug
  12014. found by croup.
  12015. - When sending destroy cells from a circuit's origin, don't include
  12016. the reason for tearing down the circuit. The spec says we didn't,
  12017. and now we actually don't. Reported by lodger.
  12018. - Keep streamids from different exits on a circuit separate. This
  12019. bug may have allowed other routers on a given circuit to inject
  12020. cells into streams. Reported by lodger; fixes bug 446.
  12021. - If there's a never-before-connected-to guard node in our list,
  12022. never choose any guards past it. This way we don't expand our
  12023. guard list unless we need to.
  12024. o Minor bugfixes (guard nodes):
  12025. - Weight guard selection by bandwidth, so that low-bandwidth nodes
  12026. don't get overused as guards.
  12027. o Minor bugfixes (directory):
  12028. - Correctly count the number of authorities that recommend each
  12029. version. Previously, we were under-counting by 1.
  12030. - Fix a potential crash bug when we load many server descriptors at
  12031. once and some of them make others of them obsolete. Fixes bug 458.
  12032. o Minor bugfixes (hidden services):
  12033. - Stop tearing down the whole circuit when the user asks for a
  12034. connection to a port that the hidden service didn't configure.
  12035. Resolves bug 444.
  12036. o Minor bugfixes (misc):
  12037. - On Windows, we were preventing other processes from reading
  12038. cached-routers while Tor was running. Reported by janbar.
  12039. - Fix a possible (but very unlikely) bug in picking routers by
  12040. bandwidth. Add a log message to confirm that it is in fact
  12041. unlikely. Patch from lodger.
  12042. - Backport a couple of memory leak fixes.
  12043. - Backport miscellaneous cosmetic bugfixes.
  12044. Changes in version 0.2.0.2-alpha - 2007-06-02
  12045. o Major bugfixes on 0.2.0.1-alpha:
  12046. - Fix an assertion failure related to servers without extra-info digests.
  12047. Resolves bugs 441 and 442.
  12048. o Minor features (directory):
  12049. - Support "If-Modified-Since" when answering HTTP requests for
  12050. directories, running-routers documents, and network-status documents.
  12051. (There's no need to support it for router descriptors, since those
  12052. are downloaded by descriptor digest.)
  12053. o Minor build issues:
  12054. - Clear up some MIPSPro compiler warnings.
  12055. - When building from a tarball on a machine that happens to have SVK
  12056. installed, report the micro-revision as whatever version existed
  12057. in the tarball, not as "x".
  12058. Changes in version 0.2.0.1-alpha - 2007-06-01
  12059. This early development snapshot provides new features for people running
  12060. Tor as both a client and a server (check out the new RelayBandwidth
  12061. config options); lets Tor run as a DNS proxy; and generally moves us
  12062. forward on a lot of fronts.
  12063. o Major features, server usability:
  12064. - New config options RelayBandwidthRate and RelayBandwidthBurst:
  12065. a separate set of token buckets for relayed traffic. Right now
  12066. relayed traffic is defined as answers to directory requests, and
  12067. OR connections that don't have any local circuits on them.
  12068. o Major features, client usability:
  12069. - A client-side DNS proxy feature to replace the need for
  12070. dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
  12071. for DNS requests on port 9999, use the Tor network to resolve them
  12072. anonymously, and send the reply back like a regular DNS server.
  12073. The code still only implements a subset of DNS.
  12074. - Make PreferTunneledDirConns and TunnelDirConns work even when
  12075. we have no cached directory info. This means Tor clients can now
  12076. do all of their connections protected by TLS.
  12077. o Major features, performance and efficiency:
  12078. - Directory authorities accept and serve "extra info" documents for
  12079. routers. These documents contain fields from router descriptors
  12080. that aren't usually needed, and that use a lot of excess
  12081. bandwidth. Once these fields are removed from router descriptors,
  12082. the bandwidth savings should be about 60%. [Partially implements
  12083. proposal 104.]
  12084. - Servers upload extra-info documents to any authority that accepts
  12085. them. Authorities (and caches that have been configured to download
  12086. extra-info documents) download them as needed. [Partially implements
  12087. proposal 104.]
  12088. - Change the way that Tor buffers data that it is waiting to write.
  12089. Instead of queueing data cells in an enormous ring buffer for each
  12090. client->OR or OR->OR connection, we now queue cells on a separate
  12091. queue for each circuit. This lets us use less slack memory, and
  12092. will eventually let us be smarter about prioritizing different kinds
  12093. of traffic.
  12094. - Use memory pools to allocate cells with better speed and memory
  12095. efficiency, especially on platforms where malloc() is inefficient.
  12096. - Stop reading on edge connections when their corresponding circuit
  12097. buffers are full; start again as the circuits empty out.
  12098. o Major features, other:
  12099. - Add an HSAuthorityRecordStats option that hidden service authorities
  12100. can use to track statistics of overall hidden service usage without
  12101. logging information that would be very useful to an attacker.
  12102. - Start work implementing multi-level keys for directory authorities:
  12103. Add a standalone tool to generate key certificates. (Proposal 103.)
  12104. o Security fixes:
  12105. - Directory authorities now call routers Stable if they have an
  12106. uptime of at least 30 days, even if that's not the median uptime
  12107. in the network. Implements proposal 107, suggested by Kevin Bauer
  12108. and Damon McCoy.
  12109. o Minor fixes (resource management):
  12110. - Count the number of open sockets separately from the number
  12111. of active connection_t objects. This will let us avoid underusing
  12112. our allocated connection limit.
  12113. - We no longer use socket pairs to link an edge connection to an
  12114. anonymous directory connection or a DirPort test connection.
  12115. Instead, we track the link internally and transfer the data
  12116. in-process. This saves two sockets per "linked" connection (at the
  12117. client and at the server), and avoids the nasty Windows socketpair()
  12118. workaround.
  12119. - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
  12120. for every single inactive connection_t. Free items from the
  12121. 4k/16k-buffer free lists when they haven't been used for a while.
  12122. o Minor features (build):
  12123. - Make autoconf search for libevent, openssl, and zlib consistently.
  12124. - Update deprecated macros in configure.in.
  12125. - When warning about missing headers, tell the user to let us
  12126. know if the compile succeeds anyway, so we can downgrade the
  12127. warning.
  12128. - Include the current subversion revision as part of the version
  12129. string: either fetch it directly if we're in an SVN checkout, do
  12130. some magic to guess it if we're in an SVK checkout, or use
  12131. the last-detected version if we're building from a .tar.gz.
  12132. Use this version consistently in log messages.
  12133. o Minor features (logging):
  12134. - Always prepend "Bug: " to any log message about a bug.
  12135. - Put a platform string (e.g. "Linux i686") in the startup log
  12136. message, so when people paste just their logs, we know if it's
  12137. OpenBSD or Windows or what.
  12138. - When logging memory usage, break down memory used in buffers by
  12139. buffer type.
  12140. o Minor features (directory system):
  12141. - New config option V2AuthoritativeDirectory that all directory
  12142. authorities should set. This will let future authorities choose
  12143. not to serve V2 directory information.
  12144. - Directory authorities allow multiple router descriptors and/or extra
  12145. info documents to be uploaded in a single go. This will make
  12146. implementing proposal 104 simpler.
  12147. o Minor features (controller):
  12148. - Add a new config option __DisablePredictedCircuits designed for
  12149. use by the controller, when we don't want Tor to build any circuits
  12150. preemptively.
  12151. - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
  12152. so we can exit from the middle of the circuit.
  12153. - Implement "getinfo status/circuit-established".
  12154. - Implement "getinfo status/version/..." so a controller can tell
  12155. whether the current version is recommended, and whether any versions
  12156. are good, and how many authorities agree. (Patch from shibz.)
  12157. o Minor features (hidden services):
  12158. - Allow multiple HiddenServicePort directives with the same virtual
  12159. port; when they occur, the user is sent round-robin to one
  12160. of the target ports chosen at random. Partially fixes bug 393 by
  12161. adding limited ad-hoc round-robining.
  12162. o Minor features (other):
  12163. - More unit tests.
  12164. - Add a new AutomapHostsOnResolve option: when it is enabled, any
  12165. resolve request for hosts matching a given pattern causes Tor to
  12166. generate an internal virtual address mapping for that host. This
  12167. allows DNSPort to work sensibly with hidden service users. By
  12168. default, .exit and .onion addresses are remapped; the list of
  12169. patterns can be reconfigured with AutomapHostsSuffixes.
  12170. - Add an "-F" option to tor-resolve to force a resolve for a .onion
  12171. address. Thanks to the AutomapHostsOnResolve option, this is no
  12172. longer a completely silly thing to do.
  12173. - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
  12174. now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
  12175. - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
  12176. minus 1 byte: the actual maximum declared bandwidth.
  12177. o Removed features:
  12178. - Removed support for the old binary "version 0" controller protocol.
  12179. This has been deprecated since 0.1.1, and warnings have been issued
  12180. since 0.1.2. When we encounter a v0 control message, we now send
  12181. back an error and close the connection.
  12182. - Remove the old "dns worker" server DNS code: it hasn't been default
  12183. since 0.1.2.2-alpha, and all the servers seem to be using the new
  12184. eventdns code.
  12185. o Minor bugfixes (portability):
  12186. - Even though Windows is equally happy with / and \ as path separators,
  12187. try to use \ consistently on Windows and / consistently on Unix: it
  12188. makes the log messages nicer.
  12189. - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
  12190. - Read resolv.conf files correctly on platforms where read() returns
  12191. partial results on small file reads.
  12192. o Minor bugfixes (directory):
  12193. - Correctly enforce that elements of directory objects do not appear
  12194. more often than they are allowed to appear.
  12195. - When we are reporting the DirServer line we just parsed, we were
  12196. logging the second stanza of the key fingerprint, not the first.
  12197. o Minor bugfixes (logging):
  12198. - When we hit an EOF on a log (probably because we're shutting down),
  12199. don't try to remove the log from the list: just mark it as
  12200. unusable. (Bulletproofs against bug 222.)
  12201. o Minor bugfixes (other):
  12202. - In the exitlist script, only consider the most recently published
  12203. server descriptor for each server. Also, when the user requests
  12204. a list of servers that _reject_ connections to a given address,
  12205. explicitly exclude the IPs that also have servers that accept
  12206. connections to that address. (Resolves bug 405.)
  12207. - Stop allowing hibernating servers to be "stable" or "fast".
  12208. - On Windows, we were preventing other processes from reading
  12209. cached-routers while Tor was running. (Reported by janbar)
  12210. - Make the NodeFamilies config option work. (Reported by
  12211. lodger -- it has never actually worked, even though we added it
  12212. in Oct 2004.)
  12213. - Check return values from pthread_mutex functions.
  12214. - Don't save non-general-purpose router descriptors to the disk cache,
  12215. because we have no way of remembering what their purpose was when
  12216. we restart.
  12217. - Add even more asserts to hunt down bug 417.
  12218. - Build without verbose warnings even on (not-yet-released) gcc 4.2.
  12219. - Fix a possible (but very unlikely) bug in picking routers by bandwidth.
  12220. Add a log message to confirm that it is in fact unlikely.
  12221. o Minor bugfixes (controller):
  12222. - Make 'getinfo fingerprint' return a 551 error if we're not a
  12223. server, so we match what the control spec claims we do. Reported
  12224. by daejees.
  12225. - Fix a typo in an error message when extendcircuit fails that
  12226. caused us to not follow the \r\n-based delimiter protocol. Reported
  12227. by daejees.
  12228. o Code simplifications and refactoring:
  12229. - Stop passing around circuit_t and crypt_path_t pointers that are
  12230. implicit in other procedure arguments.
  12231. - Drop the old code to choke directory connections when the
  12232. corresponding OR connections got full: thanks to the cell queue
  12233. feature, OR conns don't get full any more.
  12234. - Make dns_resolve() handle attaching connections to circuits
  12235. properly, so the caller doesn't have to.
  12236. - Rename wants_to_read and wants_to_write to read/write_blocked_on_bw.
  12237. - Keep the connection array as a dynamic smartlist_t, rather than as
  12238. a fixed-sized array. This is important, as the number of connections
  12239. is becoming increasingly decoupled from the number of sockets.
  12240. Changes in version 0.1.2.14 - 2007-05-25
  12241. Tor 0.1.2.14 changes the addresses of two directory authorities (this
  12242. change especially affects those who serve or use hidden services),
  12243. and fixes several other crash- and security-related bugs.
  12244. o Directory authority changes:
  12245. - Two directory authorities (moria1 and moria2) just moved to new
  12246. IP addresses. This change will particularly affect those who serve
  12247. or use hidden services.
  12248. o Major bugfixes (crashes):
  12249. - If a directory server runs out of space in the connection table
  12250. as it's processing a begin_dir request, it will free the exit stream
  12251. but leave it attached to the circuit, leading to unpredictable
  12252. behavior. (Reported by seeess, fixes bug 425.)
  12253. - Fix a bug in dirserv_remove_invalid() that would cause authorities
  12254. to corrupt memory under some really unlikely scenarios.
  12255. - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
  12256. - Avoid segfaults when reading from mmaped descriptor file. (Reported
  12257. by lodger.)
  12258. o Major bugfixes (security):
  12259. - When choosing an entry guard for a circuit, avoid using guards
  12260. that are in the same family as the chosen exit -- not just guards
  12261. that are exactly the chosen exit. (Reported by lodger.)
  12262. o Major bugfixes (resource management):
  12263. - If a directory authority is down, skip it when deciding where to get
  12264. networkstatus objects or descriptors. Otherwise we keep asking
  12265. every 10 seconds forever. Fixes bug 384.
  12266. - Count it as a failure if we fetch a valid network-status but we
  12267. don't want to keep it. Otherwise we'll keep fetching it and keep
  12268. not wanting to keep it. Fixes part of bug 422.
  12269. - If all of our dirservers have given us bad or no networkstatuses
  12270. lately, then stop hammering them once per minute even when we
  12271. think they're failed. Fixes another part of bug 422.
  12272. o Minor bugfixes:
  12273. - Actually set the purpose correctly for descriptors inserted with
  12274. purpose=controller.
  12275. - When we have k non-v2 authorities in our DirServer config,
  12276. we ignored the last k authorities in the list when updating our
  12277. network-statuses.
  12278. - Correctly back-off from requesting router descriptors that we are
  12279. having a hard time downloading.
  12280. - Read resolv.conf files correctly on platforms where read() returns
  12281. partial results on small file reads.
  12282. - Don't rebuild the entire router store every time we get 32K of
  12283. routers: rebuild it when the journal gets very large, or when
  12284. the gaps in the store get very large.
  12285. o Minor features:
  12286. - When routers publish SVN revisions in their router descriptors,
  12287. authorities now include those versions correctly in networkstatus
  12288. documents.
  12289. - Warn when using a version of libevent before 1.3b to run a server on
  12290. OSX or BSD: these versions interact badly with userspace threads.
  12291. Changes in version 0.1.2.13 - 2007-04-24
  12292. This release features some major anonymity fixes, such as safer path
  12293. selection; better client performance; faster bootstrapping, better
  12294. address detection, and better DNS support for servers; write limiting as
  12295. well as read limiting to make servers easier to run; and a huge pile of
  12296. other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
  12297. Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  12298. of the Freenode IRC network, remembering his patience and vision for
  12299. free speech on the Internet.
  12300. o Minor fixes:
  12301. - Fix a memory leak when we ask for "all" networkstatuses and we
  12302. get one we don't recognize.
  12303. - Add more asserts to hunt down bug 417.
  12304. - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
  12305. Changes in version 0.1.2.12-rc - 2007-03-16
  12306. o Major bugfixes:
  12307. - Fix an infinite loop introduced in 0.1.2.7-alpha when we serve
  12308. directory information requested inside Tor connections (i.e. via
  12309. begin_dir cells). It only triggered when the same connection was
  12310. serving other data at the same time. Reported by seeess.
  12311. o Minor bugfixes:
  12312. - When creating a circuit via the controller, send a 'launched'
  12313. event when we're done, so we follow the spec better.
  12314. Changes in version 0.1.2.11-rc - 2007-03-15
  12315. o Minor bugfixes (controller), reported by daejees:
  12316. - Correct the control spec to match how the code actually responds
  12317. to 'getinfo addr-mappings/*'.
  12318. - The control spec described a GUARDS event, but the code
  12319. implemented a GUARD event. Standardize on GUARD, but let people
  12320. ask for GUARDS too.
  12321. Changes in version 0.1.2.10-rc - 2007-03-07
  12322. o Major bugfixes (Windows):
  12323. - Do not load the NT services library functions (which may not exist)
  12324. just to detect if we're a service trying to shut down. Now we run
  12325. on Win98 and friends again.
  12326. o Minor bugfixes (other):
  12327. - Clarify a couple of log messages.
  12328. - Fix a misleading socks5 error number.
  12329. Changes in version 0.1.2.9-rc - 2007-03-02
  12330. o Major bugfixes (Windows):
  12331. - On MinGW, use "%I64u" to printf/scanf 64-bit integers, instead
  12332. of the usual GCC "%llu". This prevents a bug when saving 64-bit
  12333. int configuration values: the high-order 32 bits would get
  12334. truncated. In particular, we were being bitten by the default
  12335. MaxAdvertisedBandwidth of 128 TB turning into 0. (Fixes bug 400
  12336. and maybe also bug 397.)
  12337. o Minor bugfixes (performance):
  12338. - Use OpenSSL's AES implementation on platforms where it's faster.
  12339. This could save us as much as 10% CPU usage.
  12340. o Minor bugfixes (server):
  12341. - Do not rotate onion key immediately after setting it for the first
  12342. time.
  12343. o Minor bugfixes (directory authorities):
  12344. - Stop calling servers that have been hibernating for a long time
  12345. "stable". Also, stop letting hibernating or obsolete servers affect
  12346. uptime and bandwidth cutoffs.
  12347. - Stop listing hibernating servers in the v1 directory.
  12348. o Minor bugfixes (hidden services):
  12349. - Upload hidden service descriptors slightly less often, to reduce
  12350. load on authorities.
  12351. o Minor bugfixes (other):
  12352. - Fix an assert that could trigger if a controller quickly set then
  12353. cleared EntryNodes. Bug found by Udo van den Heuvel.
  12354. - On architectures where sizeof(int)>4, still clamp declarable bandwidth
  12355. to INT32_MAX.
  12356. - Fix a potential race condition in the rpm installer. Found by
  12357. Stefan Nordhausen.
  12358. - Try to fix eventdns warnings once and for all: do not treat a dns rcode
  12359. of 2 as indicating that the server is completely bad; it sometimes
  12360. means that the server is just bad for the request in question. (may fix
  12361. the last of bug 326.)
  12362. - Disable encrypted directory connections when we don't have a server
  12363. descriptor for the destination. We'll get this working again in
  12364. the 0.2.0 branch.
  12365. Changes in version 0.1.2.8-beta - 2007-02-26
  12366. o Major bugfixes (crashes):
  12367. - Stop crashing when the controller asks us to resetconf more than
  12368. one config option at once. (Vidalia 0.0.11 does this.)
  12369. - Fix a crash that happened on Win98 when we're given command-line
  12370. arguments: don't try to load NT service functions from advapi32.dll
  12371. except when we need them. (Bug introduced in 0.1.2.7-alpha;
  12372. resolves bug 389.)
  12373. - Fix a longstanding obscure crash bug that could occur when
  12374. we run out of DNS worker processes. (Resolves bug 390.)
  12375. o Major bugfixes (hidden services):
  12376. - Correctly detect whether hidden service descriptor downloads are
  12377. in-progress. (Suggested by Karsten Loesing; fixes bug 399.)
  12378. o Major bugfixes (accounting):
  12379. - When we start during an accounting interval before it's time to wake
  12380. up, remember to wake up at the correct time. (May fix bug 342.)
  12381. o Minor bugfixes (controller):
  12382. - Give the controller END_STREAM_REASON_DESTROY events _before_ we
  12383. clear the corresponding on_circuit variable, and remember later
  12384. that we don't need to send a redundant CLOSED event. Resolves part
  12385. 3 of bug 367.
  12386. - Report events where a resolve succeeded or where we got a socks
  12387. protocol error correctly, rather than calling both of them
  12388. "INTERNAL".
  12389. - Change reported stream target addresses to IP consistently when
  12390. we finally get the IP from an exit node.
  12391. - Send log messages to the controller even if they happen to be very
  12392. long.
  12393. o Minor bugfixes (other):
  12394. - Display correct results when reporting which versions are
  12395. recommended, and how recommended they are. (Resolves bug 383.)
  12396. - Improve our estimates for directory bandwidth to be less random:
  12397. guess that an unrecognized directory will have the average bandwidth
  12398. from all known directories, not that it will have the average
  12399. bandwidth from those directories earlier than it on the list.
  12400. - If we start a server with ClientOnly 1, then set ClientOnly to 0
  12401. and hup, stop triggering an assert based on an empty onion_key.
  12402. - On platforms with no working mmap() equivalent, don't warn the
  12403. user when cached-routers doesn't exist.
  12404. - Warn the user when mmap() [or its equivalent] fails for some reason
  12405. other than file-not-found.
  12406. - Don't warn the user when cached-routers.new doesn't exist: that's
  12407. perfectly fine when starting up for the first time.
  12408. - When EntryNodes are configured, rebuild the guard list to contain,
  12409. in order: the EntryNodes that were guards before; the rest of the
  12410. EntryNodes; the nodes that were guards before.
  12411. - Mask out all signals in sub-threads; only the libevent signal
  12412. handler should be processing them. This should prevent some crashes
  12413. on some machines using pthreads. (Patch from coderman.)
  12414. - Fix switched arguments on memset in the implementation of
  12415. tor_munmap() for systems with no mmap() call.
  12416. - When Tor receives a router descriptor that it asked for, but
  12417. no longer wants (because it has received fresh networkstatuses
  12418. in the meantime), do not warn the user. Cache the descriptor if
  12419. we're a cache; drop it if we aren't.
  12420. - Make earlier entry guards _really_ get retried when the network
  12421. comes back online.
  12422. - On a malformed DNS reply, always give an error to the corresponding
  12423. DNS request.
  12424. - Build with recent libevents on platforms that do not define the
  12425. nonstandard types "u_int8_t" and friends.
  12426. o Minor features (controller):
  12427. - Warn the user when an application uses the obsolete binary v0
  12428. control protocol. We're planning to remove support for it during
  12429. the next development series, so it's good to give people some
  12430. advance warning.
  12431. - Add STREAM_BW events to report per-entry-stream bandwidth
  12432. use. (Patch from Robert Hogan.)
  12433. - Rate-limit SIGNEWNYM signals in response to controllers that
  12434. impolitely generate them for every single stream. (Patch from
  12435. mwenge; closes bug 394.)
  12436. - Make REMAP stream events have a SOURCE (cache or exit), and
  12437. make them generated in every case where we get a successful
  12438. connected or resolved cell.
  12439. o Minor bugfixes (performance):
  12440. - Call router_have_min_dir_info half as often. (This is showing up in
  12441. some profiles, but not others.)
  12442. - When using GCC, make log_debug never get called at all, and its
  12443. arguments never get evaluated, when no debug logs are configured.
  12444. (This is showing up in some profiles, but not others.)
  12445. o Minor features:
  12446. - Remove some never-implemented options. Mark PathlenCoinWeight as
  12447. obsolete.
  12448. - Implement proposal 106: Stop requiring clients to have well-formed
  12449. certificates; stop checking nicknames in certificates. (Clients
  12450. have certificates so that they can look like Tor servers, but in
  12451. the future we might want to allow them to look like regular TLS
  12452. clients instead. Nicknames in certificates serve no purpose other
  12453. than making our protocol easier to recognize on the wire.)
  12454. - Revise messages on handshake failure again to be even more clear about
  12455. which are incoming connections and which are outgoing.
  12456. - Discard any v1 directory info that's over 1 month old (for
  12457. directories) or over 1 week old (for running-routers lists).
  12458. - Do not warn when individual nodes in the configuration's EntryNodes,
  12459. ExitNodes, etc are down: warn only when all possible nodes
  12460. are down. (Fixes bug 348.)
  12461. - Always remove expired routers and networkstatus docs before checking
  12462. whether we have enough information to build circuits. (Fixes
  12463. bug 373.)
  12464. - Put a lower-bound on MaxAdvertisedBandwidth.
  12465. Changes in version 0.1.2.7-alpha - 2007-02-06
  12466. o Major bugfixes (rate limiting):
  12467. - Servers decline directory requests much more aggressively when
  12468. they're low on bandwidth. Otherwise they end up queueing more and
  12469. more directory responses, which can't be good for latency.
  12470. - But never refuse directory requests from local addresses.
  12471. - Fix a memory leak when sending a 503 response for a networkstatus
  12472. request.
  12473. - Be willing to read or write on local connections (e.g. controller
  12474. connections) even when the global rate limiting buckets are empty.
  12475. - If our system clock jumps back in time, don't publish a negative
  12476. uptime in the descriptor. Also, don't let the global rate limiting
  12477. buckets go absurdly negative.
  12478. - Flush local controller connection buffers periodically as we're
  12479. writing to them, so we avoid queueing 4+ megabytes of data before
  12480. trying to flush.
  12481. o Major bugfixes (NT services):
  12482. - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
  12483. command-line flag so that admins can override the default by saying
  12484. "tor --service install --user "SomeUser"". This will not affect
  12485. existing installed services. Also, warn the user that the service
  12486. will look for its configuration file in the service user's
  12487. %appdata% directory. (We can't do the 'hardwire the user's appdata
  12488. directory' trick any more, since we may not have read access to that
  12489. directory.)
  12490. o Major bugfixes (other):
  12491. - Previously, we would cache up to 16 old networkstatus documents
  12492. indefinitely, if they came from nontrusted authorities. Now we
  12493. discard them if they are more than 10 days old.
  12494. - Fix a crash bug in the presence of DNS hijacking (reported by Andrew
  12495. Del Vecchio).
  12496. - Detect and reject malformed DNS responses containing circular
  12497. pointer loops.
  12498. - If exits are rare enough that we're not marking exits as guards,
  12499. ignore exit bandwidth when we're deciding the required bandwidth
  12500. to become a guard.
  12501. - When we're handling a directory connection tunneled over Tor,
  12502. don't fill up internal memory buffers with all the data we want
  12503. to tunnel; instead, only add it if the OR connection that will
  12504. eventually receive it has some room for it. (This can lead to
  12505. slowdowns in tunneled dir connections; a better solution will have
  12506. to wait for 0.2.0.)
  12507. o Minor bugfixes (dns):
  12508. - Add some defensive programming to eventdns.c in an attempt to catch
  12509. possible memory-stomping bugs.
  12510. - Detect and reject DNS replies containing IPv4 or IPv6 records with
  12511. an incorrect number of bytes. (Previously, we would ignore the
  12512. extra bytes.)
  12513. - Fix as-yet-unused reverse IPv6 lookup code so it sends nybbles
  12514. in the correct order, and doesn't crash.
  12515. - Free memory held in recently-completed DNS lookup attempts on exit.
  12516. This was not a memory leak, but may have been hiding memory leaks.
  12517. - Handle TTL values correctly on reverse DNS lookups.
  12518. - Treat failure to parse resolv.conf as an error.
  12519. o Minor bugfixes (other):
  12520. - Fix crash with "tor --list-fingerprint" (reported by seeess).
  12521. - When computing clock skew from directory HTTP headers, consider what
  12522. time it was when we finished asking for the directory, not what
  12523. time it is now.
  12524. - Expire socks connections if they spend too long waiting for the
  12525. handshake to finish. Previously we would let them sit around for
  12526. days, if the connecting application didn't close them either.
  12527. - And if the socks handshake hasn't started, don't send a
  12528. "DNS resolve socks failed" handshake reply; just close it.
  12529. - Stop using C functions that OpenBSD's linker doesn't like.
  12530. - Don't launch requests for descriptors unless we have networkstatuses
  12531. from at least half of the authorities. This delays the first
  12532. download slightly under pathological circumstances, but can prevent
  12533. us from downloading a bunch of descriptors we don't need.
  12534. - Do not log IPs with TLS failures for incoming TLS
  12535. connections. (Fixes bug 382.)
  12536. - If the user asks to use invalid exit nodes, be willing to use
  12537. unstable ones.
  12538. - Stop using the reserved ac_cv namespace in our configure script.
  12539. - Call stat() slightly less often; use fstat() when possible.
  12540. - Refactor the way we handle pending circuits when an OR connection
  12541. completes or fails, in an attempt to fix a rare crash bug.
  12542. - Only rewrite a conn's address based on X-Forwarded-For: headers
  12543. if it's a parseable public IP address; and stop adding extra quotes
  12544. to the resulting address.
  12545. o Major features:
  12546. - Weight directory requests by advertised bandwidth. Now we can
  12547. let servers enable write limiting but still allow most clients to
  12548. succeed at their directory requests. (We still ignore weights when
  12549. choosing a directory authority; I hope this is a feature.)
  12550. o Minor features:
  12551. - Create a new file ReleaseNotes which was the old ChangeLog. The
  12552. new ChangeLog file now includes the summaries for all development
  12553. versions too.
  12554. - Check for addresses with invalid characters at the exit as well
  12555. as at the client, and warn less verbosely when they fail. You can
  12556. override this by setting ServerDNSAllowNonRFC953Addresses to 1.
  12557. - Adapt a patch from goodell to let the contrib/exitlist script
  12558. take arguments rather than require direct editing.
  12559. - Inform the server operator when we decide not to advertise a
  12560. DirPort due to AccountingMax enabled or a low BandwidthRate. It
  12561. was confusing Zax, so now we're hopefully more helpful.
  12562. - Bring us one step closer to being able to establish an encrypted
  12563. directory tunnel without knowing a descriptor first. Still not
  12564. ready yet. As part of the change, now assume we can use a
  12565. create_fast cell if we don't know anything about a router.
  12566. - Allow exit nodes to use nameservers running on ports other than 53.
  12567. - Servers now cache reverse DNS replies.
  12568. - Add an --ignore-missing-torrc command-line option so that we can
  12569. get the "use sensible defaults if the configuration file doesn't
  12570. exist" behavior even when specifying a torrc location on the command
  12571. line.
  12572. o Minor features (controller):
  12573. - Track reasons for OR connection failure; make these reasons
  12574. available via the controller interface. (Patch from Mike Perry.)
  12575. - Add a SOCKS_BAD_HOSTNAME client status event so controllers
  12576. can learn when clients are sending malformed hostnames to Tor.
  12577. - Clean up documentation for controller status events.
  12578. - Add a REMAP status to stream events to note that a stream's
  12579. address has changed because of a cached address or a MapAddress
  12580. directive.
  12581. Changes in version 0.1.2.6-alpha - 2007-01-09
  12582. o Major bugfixes:
  12583. - Fix an assert error introduced in 0.1.2.5-alpha: if a single TLS
  12584. connection handles more than 4 gigs in either direction, we crash.
  12585. - Fix an assert error introduced in 0.1.2.5-alpha: if we're an
  12586. advertised exit node, somebody might try to exit from us when
  12587. we're bootstrapping and before we've built our descriptor yet.
  12588. Refuse the connection rather than crashing.
  12589. o Minor bugfixes:
  12590. - Warn if we (as a server) find that we've resolved an address that we
  12591. weren't planning to resolve.
  12592. - Warn that using select() on any libevent version before 1.1 will be
  12593. unnecessarily slow (even for select()).
  12594. - Flush ERR-level controller status events just like we currently
  12595. flush ERR-level log events, so that a Tor shutdown doesn't prevent
  12596. the controller from learning about current events.
  12597. o Minor features (more controller status events):
  12598. - Implement EXTERNAL_ADDRESS server status event so controllers can
  12599. learn when our address changes.
  12600. - Implement BAD_SERVER_DESCRIPTOR server status event so controllers
  12601. can learn when directories reject our descriptor.
  12602. - Implement SOCKS_UNKNOWN_PROTOCOL client status event so controllers
  12603. can learn when a client application is speaking a non-socks protocol
  12604. to our SocksPort.
  12605. - Implement DANGEROUS_SOCKS client status event so controllers
  12606. can learn when a client application is leaking DNS addresses.
  12607. - Implement BUG general status event so controllers can learn when
  12608. Tor is unhappy about its internal invariants.
  12609. - Implement CLOCK_SKEW general status event so controllers can learn
  12610. when Tor thinks the system clock is set incorrectly.
  12611. - Implement GOOD_SERVER_DESCRIPTOR and ACCEPTED_SERVER_DESCRIPTOR
  12612. server status events so controllers can learn when their descriptors
  12613. are accepted by a directory.
  12614. - Implement CHECKING_REACHABILITY and REACHABILITY_{SUCCEEDED|FAILED}
  12615. server status events so controllers can learn about Tor's progress in
  12616. deciding whether it's reachable from the outside.
  12617. - Implement BAD_LIBEVENT general status event so controllers can learn
  12618. when we have a version/method combination in libevent that needs to
  12619. be changed.
  12620. - Implement NAMESERVER_STATUS, NAMESERVER_ALL_DOWN, DNS_HIJACKED,
  12621. and DNS_USELESS server status events so controllers can learn
  12622. about changes to DNS server status.
  12623. o Minor features (directory):
  12624. - Authorities no longer recommend exits as guards if this would shift
  12625. too much load to the exit nodes.
  12626. Changes in version 0.1.2.5-alpha - 2007-01-06
  12627. o Major features:
  12628. - Enable write limiting as well as read limiting. Now we sacrifice
  12629. capacity if we're pushing out lots of directory traffic, rather
  12630. than overrunning the user's intended bandwidth limits.
  12631. - Include TLS overhead when counting bandwidth usage; previously, we
  12632. would count only the bytes sent over TLS, but not the bytes used
  12633. to send them.
  12634. - Support running the Tor service with a torrc not in the same
  12635. directory as tor.exe and default to using the torrc located in
  12636. the %appdata%\Tor\ of the user who installed the service. Patch
  12637. from Matt Edman.
  12638. - Servers now check for the case when common DNS requests are going to
  12639. wildcarded addresses (i.e. all getting the same answer), and change
  12640. their exit policy to reject *:* if it's happening.
  12641. - Implement BEGIN_DIR cells, so we can connect to the directory
  12642. server via TLS to do encrypted directory requests rather than
  12643. plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
  12644. config options if you like.
  12645. o Minor features (config and docs):
  12646. - Start using the state file to store bandwidth accounting data:
  12647. the bw_accounting file is now obsolete. We'll keep generating it
  12648. for a while for people who are still using 0.1.2.4-alpha.
  12649. - Try to batch changes to the state file so that we do as few
  12650. disk writes as possible while still storing important things in
  12651. a timely fashion.
  12652. - The state file and the bw_accounting file get saved less often when
  12653. the AvoidDiskWrites config option is set.
  12654. - Make PIDFile work on Windows (untested).
  12655. - Add internal descriptions for a bunch of configuration options:
  12656. accessible via controller interface and in comments in saved
  12657. options files.
  12658. - Reject *:563 (NNTPS) in the default exit policy. We already reject
  12659. NNTP by default, so this seems like a sensible addition.
  12660. - Clients now reject hostnames with invalid characters. This should
  12661. avoid some inadvertent info leaks. Add an option
  12662. AllowNonRFC953Hostnames to disable this behavior, in case somebody
  12663. is running a private network with hosts called @, !, and #.
  12664. - Add a maintainer script to tell us which options are missing
  12665. documentation: "make check-docs".
  12666. - Add a new address-spec.txt document to describe our special-case
  12667. addresses: .exit, .onion, and .noconnnect.
  12668. o Minor features (DNS):
  12669. - Ongoing work on eventdns infrastructure: now it has dns server
  12670. and ipv6 support. One day Tor will make use of it.
  12671. - Add client-side caching for reverse DNS lookups.
  12672. - Add support to tor-resolve tool for reverse lookups and SOCKS5.
  12673. - When we change nameservers or IP addresses, reset and re-launch
  12674. our tests for DNS hijacking.
  12675. o Minor features (directory):
  12676. - Authorities now specify server versions in networkstatus. This adds
  12677. about 2% to the size of compressed networkstatus docs, and allows
  12678. clients to tell which servers support BEGIN_DIR and which don't.
  12679. The implementation is forward-compatible with a proposed future
  12680. protocol version scheme not tied to Tor versions.
  12681. - DirServer configuration lines now have an orport= option so
  12682. clients can open encrypted tunnels to the authorities without
  12683. having downloaded their descriptors yet. Enabled for moria1,
  12684. moria2, tor26, and lefkada now in the default configuration.
  12685. - Directory servers are more willing to send a 503 "busy" if they
  12686. are near their write limit, especially for v1 directory requests.
  12687. Now they can use their limited bandwidth for actual Tor traffic.
  12688. - Clients track responses with status 503 from dirservers. After a
  12689. dirserver has given us a 503, we try not to use it until an hour has
  12690. gone by, or until we have no dirservers that haven't given us a 503.
  12691. - When we get a 503 from a directory, and we're not a server, we don't
  12692. count the failure against the total number of failures allowed
  12693. for the thing we're trying to download.
  12694. - Report X-Your-Address-Is correctly from tunneled directory
  12695. connections; don't report X-Your-Address-Is when it's an internal
  12696. address; and never believe reported remote addresses when they're
  12697. internal.
  12698. - Protect against an unlikely DoS attack on directory servers.
  12699. - Add a BadDirectory flag to network status docs so that authorities
  12700. can (eventually) tell clients about caches they believe to be
  12701. broken.
  12702. o Minor features (controller):
  12703. - Have GETINFO dir/status/* work on hosts with DirPort disabled.
  12704. - Reimplement GETINFO so that info/names stays in sync with the
  12705. actual keys.
  12706. - Implement "GETINFO fingerprint".
  12707. - Implement "SETEVENTS GUARD" so controllers can get updates on
  12708. entry guard status as it changes.
  12709. o Minor features (clean up obsolete pieces):
  12710. - Remove some options that have been deprecated since at least
  12711. 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
  12712. SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
  12713. to set log options.
  12714. - We no longer look for identity and onion keys in "identity.key" and
  12715. "onion.key" -- these were replaced by secret_id_key and
  12716. secret_onion_key in 0.0.8pre1.
  12717. - We no longer require unrecognized directory entries to be
  12718. preceded by "opt".
  12719. o Major bugfixes (security):
  12720. - Stop sending the HttpProxyAuthenticator string to directory
  12721. servers when directory connections are tunnelled through Tor.
  12722. - Clients no longer store bandwidth history in the state file.
  12723. - Do not log introduction points for hidden services if SafeLogging
  12724. is set.
  12725. - When generating bandwidth history, round down to the nearest
  12726. 1k. When storing accounting data, round up to the nearest 1k.
  12727. - When we're running as a server, remember when we last rotated onion
  12728. keys, so that we will rotate keys once they're a week old even if
  12729. we never stay up for a week ourselves.
  12730. o Major bugfixes (other):
  12731. - Fix a longstanding bug in eventdns that prevented the count of
  12732. timed-out resolves from ever being reset. This bug caused us to
  12733. give up on a nameserver the third time it timed out, and try it
  12734. 10 seconds later... and to give up on it every time it timed out
  12735. after that.
  12736. - Take out the '5 second' timeout from the connection retry
  12737. schedule. Now the first connect attempt will wait a full 10
  12738. seconds before switching to a new circuit. Perhaps this will help
  12739. a lot. Based on observations from Mike Perry.
  12740. - Fix a bug on the Windows implementation of tor_mmap_file() that
  12741. would prevent the cached-routers file from ever loading. Reported
  12742. by John Kimble.
  12743. o Minor bugfixes:
  12744. - Fix an assert failure when a directory authority sets
  12745. AuthDirRejectUnlisted and then receives a descriptor from an
  12746. unlisted router. Reported by seeess.
  12747. - Avoid a double-free when parsing malformed DirServer lines.
  12748. - Fix a bug when a BSD-style PF socket is first used. Patch from
  12749. Fabian Keil.
  12750. - Fix a bug in 0.1.2.2-alpha that prevented clients from asking
  12751. to resolve an address at a given exit node even when they ask for
  12752. it by name.
  12753. - Servers no longer ever list themselves in their "family" line,
  12754. even if configured to do so. This makes it easier to configure
  12755. family lists conveniently.
  12756. - When running as a server, don't fall back to 127.0.0.1 when no
  12757. nameservers are configured in /etc/resolv.conf; instead, make the
  12758. user fix resolv.conf or specify nameservers explicitly. (Resolves
  12759. bug 363.)
  12760. - Stop accepting certain malformed ports in configured exit policies.
  12761. - Don't re-write the fingerprint file every restart, unless it has
  12762. changed.
  12763. - Stop warning when a single nameserver fails: only warn when _all_ of
  12764. our nameservers have failed. Also, when we only have one nameserver,
  12765. raise the threshold for deciding that the nameserver is dead.
  12766. - Directory authorities now only decide that routers are reachable
  12767. if their identity keys are as expected.
  12768. - When the user uses bad syntax in the Log config line, stop
  12769. suggesting other bad syntax as a replacement.
  12770. - Correctly detect ipv6 DNS capability on OpenBSD.
  12771. o Minor bugfixes (controller):
  12772. - Report the circuit number correctly in STREAM CLOSED events. Bug
  12773. reported by Mike Perry.
  12774. - Do not report bizarre values for results of accounting GETINFOs
  12775. when the last second's write or read exceeds the allotted bandwidth.
  12776. - Report "unrecognized key" rather than an empty string when the
  12777. controller tries to fetch a networkstatus that doesn't exist.
  12778. Changes in version 0.1.1.26 - 2006-12-14
  12779. o Security bugfixes:
  12780. - Stop sending the HttpProxyAuthenticator string to directory
  12781. servers when directory connections are tunnelled through Tor.
  12782. - Clients no longer store bandwidth history in the state file.
  12783. - Do not log introduction points for hidden services if SafeLogging
  12784. is set.
  12785. o Minor bugfixes:
  12786. - Fix an assert failure when a directory authority sets
  12787. AuthDirRejectUnlisted and then receives a descriptor from an
  12788. unlisted router (reported by seeess).
  12789. Changes in version 0.1.2.4-alpha - 2006-12-03
  12790. o Major features:
  12791. - Add support for using natd; this allows FreeBSDs earlier than
  12792. 5.1.2 to have ipfw send connections through Tor without using
  12793. SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
  12794. o Minor features:
  12795. - Make all connections to addresses of the form ".noconnect"
  12796. immediately get closed. This lets application/controller combos
  12797. successfully test whether they're talking to the same Tor by
  12798. watching for STREAM events.
  12799. - Make cross.sh cross-compilation script work even when autogen.sh
  12800. hasn't been run. (Patch from Michael Mohr.)
  12801. - Statistics dumped by -USR2 now include a breakdown of public key
  12802. operations, for profiling.
  12803. o Major bugfixes:
  12804. - Fix a major leak when directory authorities parse their
  12805. approved-routers list, a minor memory leak when we fail to pick
  12806. an exit node, and a few rare leaks on errors.
  12807. - Handle TransPort connections even when the server sends data before
  12808. the client sends data. Previously, the connection would just hang
  12809. until the client sent data. (Patch from tup based on patch from
  12810. Zajcev Evgeny.)
  12811. - Avoid assert failure when our cached-routers file is empty on
  12812. startup.
  12813. o Minor bugfixes:
  12814. - Don't log spurious warnings when we see a circuit close reason we
  12815. don't recognize; it's probably just from a newer version of Tor.
  12816. - Have directory authorities allow larger amounts of drift in uptime
  12817. without replacing the server descriptor: previously, a server that
  12818. restarted every 30 minutes could have 48 "interesting" descriptors
  12819. per day.
  12820. - Start linking to the Tor specification and Tor reference manual
  12821. correctly in the Windows installer.
  12822. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  12823. Tor/Privoxy we also uninstall Vidalia.
  12824. - Resume building on Irix64, and fix a lot of warnings from its
  12825. MIPSpro C compiler.
  12826. - Don't corrupt last_guessed_ip in router_new_address_suggestion()
  12827. when we're running as a client.
  12828. Changes in version 0.1.1.25 - 2006-11-04
  12829. o Major bugfixes:
  12830. - When a client asks us to resolve (rather than connect to)
  12831. an address, and we have a cached answer, give them the cached
  12832. answer. Previously, we would give them no answer at all.
  12833. - We were building exactly the wrong circuits when we predict
  12834. hidden service requirements, meaning Tor would have to build all
  12835. its circuits on demand.
  12836. - If none of our live entry guards have a high uptime, but we
  12837. require a guard with a high uptime, try adding a new guard before
  12838. we give up on the requirement. This patch should make long-lived
  12839. connections more stable on average.
  12840. - When testing reachability of our DirPort, don't launch new
  12841. tests when there's already one in progress -- unreachable
  12842. servers were stacking up dozens of testing streams.
  12843. o Security bugfixes:
  12844. - When the user sends a NEWNYM signal, clear the client-side DNS
  12845. cache too. Otherwise we continue to act on previous information.
  12846. o Minor bugfixes:
  12847. - Avoid a memory corruption bug when creating a hash table for
  12848. the first time.
  12849. - Avoid possibility of controller-triggered crash when misusing
  12850. certain commands from a v0 controller on platforms that do not
  12851. handle printf("%s",NULL) gracefully.
  12852. - Avoid infinite loop on unexpected controller input.
  12853. - Don't log spurious warnings when we see a circuit close reason we
  12854. don't recognize; it's probably just from a newer version of Tor.
  12855. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  12856. Tor/Privoxy we also uninstall Vidalia.
  12857. Changes in version 0.1.2.3-alpha - 2006-10-29
  12858. o Minor features:
  12859. - Prepare for servers to publish descriptors less often: never
  12860. discard a descriptor simply for being too old until either it is
  12861. recommended by no authorities, or until we get a better one for
  12862. the same router. Make caches consider retaining old recommended
  12863. routers for even longer.
  12864. - If most authorities set a BadExit flag for a server, clients
  12865. don't think of it as a general-purpose exit. Clients only consider
  12866. authorities that advertise themselves as listing bad exits.
  12867. - Directory servers now provide 'Pragma: no-cache' and 'Expires'
  12868. headers for content, so that we can work better in the presence of
  12869. caching HTTP proxies.
  12870. - Allow authorities to list nodes as bad exits by fingerprint or by
  12871. address.
  12872. o Minor features, controller:
  12873. - Add a REASON field to CIRC events; for backward compatibility, this
  12874. field is sent only to controllers that have enabled the extended
  12875. event format. Also, add additional reason codes to explain why
  12876. a given circuit has been destroyed or truncated. (Patches from
  12877. Mike Perry)
  12878. - Add a REMOTE_REASON field to extended CIRC events to tell the
  12879. controller about why a remote OR told us to close a circuit.
  12880. - Stream events also now have REASON and REMOTE_REASON fields,
  12881. working much like those for circuit events.
  12882. - There's now a GETINFO ns/... field so that controllers can ask Tor
  12883. about the current status of a router.
  12884. - A new event type "NS" to inform a controller when our opinion of
  12885. a router's status has changed.
  12886. - Add a GETINFO events/names and GETINFO features/names so controllers
  12887. can tell which events and features are supported.
  12888. - A new CLEARDNSCACHE signal to allow controllers to clear the
  12889. client-side DNS cache without expiring circuits.
  12890. o Security bugfixes:
  12891. - When the user sends a NEWNYM signal, clear the client-side DNS
  12892. cache too. Otherwise we continue to act on previous information.
  12893. o Minor bugfixes:
  12894. - Avoid sending junk to controllers or segfaulting when a controller
  12895. uses EVENT_NEW_DESC with verbose nicknames.
  12896. - Stop triggering asserts if the controller tries to extend hidden
  12897. service circuits (reported by mwenge).
  12898. - Avoid infinite loop on unexpected controller input.
  12899. - When the controller does a "GETINFO network-status", tell it
  12900. about even those routers whose descriptors are very old, and use
  12901. long nicknames where appropriate.
  12902. - Change NT service functions to be loaded on demand. This lets us
  12903. build with MinGW without breaking Tor for Windows 98 users.
  12904. - Do DirPort reachability tests less often, since a single test
  12905. chews through many circuits before giving up.
  12906. - In the hidden service example in torrc.sample, stop recommending
  12907. esoteric and discouraged hidden service options.
  12908. - When stopping an NT service, wait up to 10 sec for it to actually
  12909. stop. Patch from Matt Edman; resolves bug 295.
  12910. - Fix handling of verbose nicknames with ORCONN controller events:
  12911. make them show up exactly when requested, rather than exactly when
  12912. not requested.
  12913. - When reporting verbose nicknames in entry_guards_getinfo(), avoid
  12914. printing a duplicate "$" in the keys we send (reported by mwenge).
  12915. - Correctly set maximum connection limit on Cygwin. (This time
  12916. for sure!)
  12917. - Try to detect Windows correctly when cross-compiling.
  12918. - Detect the size of the routers file correctly even if it is
  12919. corrupted (on systems without mmap) or not page-aligned (on systems
  12920. with mmap). This bug was harmless.
  12921. - Sometimes we didn't bother sending a RELAY_END cell when an attempt
  12922. to open a stream fails; now we do in more cases. This should
  12923. make clients able to find a good exit faster in some cases, since
  12924. unhandleable requests will now get an error rather than timing out.
  12925. - Resolve two memory leaks when rebuilding the on-disk router cache
  12926. (reported by fookoowa).
  12927. - Clean up minor code warnings suggested by the MIPSpro C compiler,
  12928. and reported by some Centos users.
  12929. - Controller signals now work on non-Unix platforms that don't define
  12930. SIGUSR1 and SIGUSR2 the way we expect.
  12931. - Patch from Michael Mohr to contrib/cross.sh, so it checks more
  12932. values before failing, and always enables eventdns.
  12933. - Libevent-1.2 exports, but does not define in its headers, strlcpy.
  12934. Try to fix this in configure.in by checking for most functions
  12935. before we check for libevent.
  12936. Changes in version 0.1.2.2-alpha - 2006-10-07
  12937. o Major features:
  12938. - Make our async eventdns library on-by-default for Tor servers,
  12939. and plan to deprecate the separate dnsworker threads.
  12940. - Add server-side support for "reverse" DNS lookups (using PTR
  12941. records so clients can determine the canonical hostname for a given
  12942. IPv4 address). Only supported by servers using eventdns; servers
  12943. now announce in their descriptors whether they support eventdns.
  12944. - Specify and implement client-side SOCKS5 interface for reverse DNS
  12945. lookups (see doc/socks-extensions.txt).
  12946. - Add a BEGIN_DIR relay cell type for an easier in-protocol way to
  12947. connect to directory servers through Tor. Previously, clients needed
  12948. to find Tor exits to make private connections to directory servers.
  12949. - Avoid choosing Exit nodes for entry or middle hops when the
  12950. total bandwidth available from non-Exit nodes is much higher than
  12951. the total bandwidth available from Exit nodes.
  12952. - Workaround for name servers (like Earthlink's) that hijack failing
  12953. DNS requests and replace the no-such-server answer with a "helpful"
  12954. redirect to an advertising-driven search portal. Also work around
  12955. DNS hijackers who "helpfully" decline to hijack known-invalid
  12956. RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
  12957. lets you turn it off.
  12958. - Send out a burst of long-range padding cells once we've established
  12959. that we're reachable. Spread them over 4 circuits, so hopefully
  12960. a few will be fast. This exercises our bandwidth and bootstraps
  12961. us into the directory more quickly.
  12962. o New/improved config options:
  12963. - Add new config option "ResolvConf" to let the server operator
  12964. choose an alternate resolve.conf file when using eventdns.
  12965. - Add an "EnforceDistinctSubnets" option to control our "exclude
  12966. servers on the same /16" behavior. It's still on by default; this
  12967. is mostly for people who want to operate private test networks with
  12968. all the machines on the same subnet.
  12969. - If one of our entry guards is on the ExcludeNodes list, or the
  12970. directory authorities don't think it's a good guard, treat it as
  12971. if it were unlisted: stop using it as a guard, and throw it off
  12972. the guards list if it stays that way for a long time.
  12973. - Allow directory authorities to be marked separately as authorities
  12974. for the v1 directory protocol, the v2 directory protocol, and
  12975. as hidden service directories, to make it easier to retire old
  12976. authorities. V1 authorities should set "HSAuthoritativeDir 1"
  12977. to continue being hidden service authorities too.
  12978. - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
  12979. o Minor features, controller:
  12980. - Fix CIRC controller events so that controllers can learn the
  12981. identity digests of non-Named servers used in circuit paths.
  12982. - Let controllers ask for more useful identifiers for servers. Instead
  12983. of learning identity digests for un-Named servers and nicknames
  12984. for Named servers, the new identifiers include digest, nickname,
  12985. and indication of Named status. Off by default; see control-spec.txt
  12986. for more information.
  12987. - Add a "getinfo address" controller command so it can display Tor's
  12988. best guess to the user.
  12989. - New controller event to alert the controller when our server
  12990. descriptor has changed.
  12991. - Give more meaningful errors on controller authentication failure.
  12992. o Minor features, other:
  12993. - When asked to resolve a hostname, don't use non-exit servers unless
  12994. requested to do so. This allows servers with broken DNS to be
  12995. useful to the network.
  12996. - Divide eventdns log messages into warn and info messages.
  12997. - Reserve the nickname "Unnamed" for routers that can't pick
  12998. a hostname: any router can call itself Unnamed; directory
  12999. authorities will never allocate Unnamed to any particular router;
  13000. clients won't believe that any router is the canonical Unnamed.
  13001. - Only include function names in log messages for info/debug messages.
  13002. For notice/warn/err, the content of the message should be clear on
  13003. its own, and printing the function name only confuses users.
  13004. - Avoid some false positives during reachability testing: don't try
  13005. to test via a server that's on the same /24 as us.
  13006. - If we fail to build a circuit to an intended enclave, and it's
  13007. not mandatory that we use that enclave, stop wanting it.
  13008. - When eventdns is enabled, allow multithreaded builds on NetBSD and
  13009. OpenBSD. (We had previously disabled threads on these platforms
  13010. because they didn't have working thread-safe resolver functions.)
  13011. o Major bugfixes, anonymity/security:
  13012. - If a client asked for a server by name, and there's a named server
  13013. in our network-status but we don't have its descriptor yet, we
  13014. could return an unnamed server instead.
  13015. - Fix NetBSD bug that could allow someone to force uninitialized RAM
  13016. to be sent to a server's DNS resolver. This only affects NetBSD
  13017. and other platforms that do not bounds-check tolower().
  13018. - Reject (most) attempts to use Tor circuits with length one. (If
  13019. many people start using Tor as a one-hop proxy, exit nodes become
  13020. a more attractive target for compromise.)
  13021. - Just because your DirPort is open doesn't mean people should be
  13022. able to remotely teach you about hidden service descriptors. Now
  13023. only accept rendezvous posts if you've got HSAuthoritativeDir set.
  13024. o Major bugfixes, other:
  13025. - Don't crash on race condition in dns.c: tor_assert(!resolve->expire)
  13026. - When a client asks the server to resolve (not connect to)
  13027. an address, and it has a cached answer, give them the cached answer.
  13028. Previously, the server would give them no answer at all.
  13029. - Allow really slow clients to not hang up five minutes into their
  13030. directory downloads (suggested by Adam J. Richter).
  13031. - We were building exactly the wrong circuits when we anticipated
  13032. hidden service requirements, meaning Tor would have to build all
  13033. its circuits on demand.
  13034. - Avoid crashing when we mmap a router cache file of size 0.
  13035. - When testing reachability of our DirPort, don't launch new
  13036. tests when there's already one in progress -- unreachable
  13037. servers were stacking up dozens of testing streams.
  13038. o Minor bugfixes, correctness:
  13039. - If we're a directory mirror and we ask for "all" network status
  13040. documents, we would discard status documents from authorities
  13041. we don't recognize.
  13042. - Avoid a memory corruption bug when creating a hash table for
  13043. the first time.
  13044. - Avoid controller-triggered crash when misusing certain commands
  13045. from a v0 controller on platforms that do not handle
  13046. printf("%s",NULL) gracefully.
  13047. - Don't crash when a controller sends a third argument to an
  13048. "extendcircuit" request.
  13049. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  13050. response; fix error code when "getinfo dir/status/" fails.
  13051. - Avoid crash when telling controller stream-status and a stream
  13052. is detached.
  13053. - Patch from Adam Langley to fix assert() in eventdns.c.
  13054. - Fix a debug log message in eventdns to say "X resolved to Y"
  13055. instead of "X resolved to X".
  13056. - Make eventdns give strings for DNS errors, not just error numbers.
  13057. - Track unreachable entry guards correctly: don't conflate
  13058. 'unreachable by us right now' with 'listed as down by the directory
  13059. authorities'. With the old code, if a guard was unreachable by
  13060. us but listed as running, it would clog our guard list forever.
  13061. - Behave correctly in case we ever have a network with more than
  13062. 2GB/s total advertised capacity.
  13063. - Make TrackExitHosts case-insensitive, and fix the behavior of
  13064. ".suffix" TrackExitHosts items to avoid matching in the middle of
  13065. an address.
  13066. - Finally fix the openssl warnings from newer gccs that believe that
  13067. ignoring a return value is okay, but casting a return value and
  13068. then ignoring it is a sign of madness.
  13069. - Prevent the contrib/exitlist script from printing the same
  13070. result more than once.
  13071. - Patch from Steve Hildrey: Generate network status correctly on
  13072. non-versioning dirservers.
  13073. - Don't listen to the X-Your-Address-Is hint if you did the lookup
  13074. via Tor; otherwise you'll think you're the exit node's IP address.
  13075. o Minor bugfixes, performance:
  13076. - Two small performance improvements on parsing descriptors.
  13077. - Major performance improvement on inserting descriptors: change
  13078. algorithm from O(n^2) to O(n).
  13079. - Make the common memory allocation path faster on machines where
  13080. malloc(0) returns a pointer.
  13081. - Start remembering X-Your-Address-Is directory hints even if you're
  13082. a client, so you can become a server more smoothly.
  13083. - Avoid duplicate entries on MyFamily line in server descriptor.
  13084. o Packaging, features:
  13085. - Remove architecture from OS X builds. The official builds are
  13086. now universal binaries.
  13087. - The Debian package now uses --verify-config when (re)starting,
  13088. to distinguish configuration errors from other errors.
  13089. - Update RPMs to require libevent 1.1b.
  13090. o Packaging, bugfixes:
  13091. - Patches so Tor builds with MinGW on Windows.
  13092. - Patches so Tor might run on Cygwin again.
  13093. - Resume building on non-gcc compilers and ancient gcc. Resume
  13094. building with the -O0 compile flag. Resume building cleanly on
  13095. Debian woody.
  13096. - Run correctly on OS X platforms with case-sensitive filesystems.
  13097. - Correct includes for net/if.h and net/pfvar.h on OpenBSD (from Tup).
  13098. - Add autoconf checks so Tor can build on Solaris x86 again.
  13099. o Documentation
  13100. - Documented (and renamed) ServerDNSSearchDomains and
  13101. ServerDNSResolvConfFile options.
  13102. - Be clearer that the *ListenAddress directives can be repeated
  13103. multiple times.
  13104. Changes in version 0.1.1.24 - 2006-09-29
  13105. o Major bugfixes:
  13106. - Allow really slow clients to not hang up five minutes into their
  13107. directory downloads (suggested by Adam J. Richter).
  13108. - Fix major performance regression from 0.1.0.x: instead of checking
  13109. whether we have enough directory information every time we want to
  13110. do something, only check when the directory information has changed.
  13111. This should improve client CPU usage by 25-50%.
  13112. - Don't crash if, after a server has been running for a while,
  13113. it can't resolve its hostname.
  13114. o Minor bugfixes:
  13115. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  13116. - Don't crash when the controller receives a third argument to an
  13117. "extendcircuit" request.
  13118. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  13119. response; fix error code when "getinfo dir/status/" fails.
  13120. - Fix configure.in to not produce broken configure files with
  13121. more recent versions of autoconf. Thanks to Clint for his auto*
  13122. voodoo.
  13123. - Fix security bug on NetBSD that could allow someone to force
  13124. uninitialized RAM to be sent to a server's DNS resolver. This
  13125. only affects NetBSD and other platforms that do not bounds-check
  13126. tolower().
  13127. - Warn user when using libevent 1.1a or earlier with win32 or kqueue
  13128. methods: these are known to be buggy.
  13129. - If we're a directory mirror and we ask for "all" network status
  13130. documents, we would discard status documents from authorities
  13131. we don't recognize.
  13132. Changes in version 0.1.2.1-alpha - 2006-08-27
  13133. o Major features:
  13134. - Add "eventdns" async dns library from Adam Langley, tweaked to
  13135. build on OSX and Windows. Only enabled if you pass the
  13136. --enable-eventdns argument to configure.
  13137. - Allow servers with no hostname or IP address to learn their
  13138. IP address by asking the directory authorities. This code only
  13139. kicks in when you would normally have exited with a "no address"
  13140. error. Nothing's authenticated, so use with care.
  13141. - Rather than waiting a fixed amount of time between retrying
  13142. application connections, we wait only 5 seconds for the first,
  13143. 10 seconds for the second, and 15 seconds for each retry after
  13144. that. Hopefully this will improve the expected user experience.
  13145. - Patch from Tup to add support for transparent AP connections:
  13146. this basically bundles the functionality of trans-proxy-tor
  13147. into the Tor mainline. Now hosts with compliant pf/netfilter
  13148. implementations can redirect TCP connections straight to Tor
  13149. without diverting through SOCKS. Needs docs.
  13150. - Busy directory servers save lots of memory by spooling server
  13151. descriptors, v1 directories, and v2 networkstatus docs to buffers
  13152. as needed rather than en masse. Also mmap the cached-routers
  13153. files, so we don't need to keep the whole thing in memory too.
  13154. - Automatically avoid picking more than one node from the same
  13155. /16 network when constructing a circuit.
  13156. - Revise and clean up the torrc.sample that we ship with; add
  13157. a section for BandwidthRate and BandwidthBurst.
  13158. o Minor features:
  13159. - Split circuit_t into origin_circuit_t and or_circuit_t, and
  13160. split connection_t into edge, or, dir, control, and base structs.
  13161. These will save quite a bit of memory on busy servers, and they'll
  13162. also help us track down bugs in the code and bugs in the spec.
  13163. - Experimentally re-enable kqueue on OSX when using libevent 1.1b
  13164. or later. Log when we are doing this, so we can diagnose it when
  13165. it fails. (Also, recommend libevent 1.1b for kqueue and
  13166. win32 methods; deprecate libevent 1.0b harder; make libevent
  13167. recommendation system saner.)
  13168. - Start being able to build universal binaries on OS X (thanks
  13169. to Phobos).
  13170. - Export the default exit policy via the control port, so controllers
  13171. don't need to guess what it is / will be later.
  13172. - Add a man page entry for ProtocolWarnings.
  13173. - Add TestVia config option to the man page.
  13174. - Remove even more protocol-related warnings from Tor server logs,
  13175. such as bad TLS handshakes and malformed begin cells.
  13176. - Stop fetching descriptors if you're not a dir mirror and you
  13177. haven't tried to establish any circuits lately. [This currently
  13178. causes some dangerous behavior, because when you start up again
  13179. you'll use your ancient server descriptors.]
  13180. - New DirPort behavior: if you have your dirport set, you download
  13181. descriptors aggressively like a directory mirror, whether or not
  13182. your ORPort is set.
  13183. - Get rid of the router_retry_connections notion. Now routers
  13184. no longer try to rebuild long-term connections to directory
  13185. authorities, and directory authorities no longer try to rebuild
  13186. long-term connections to all servers. We still don't hang up
  13187. connections in these two cases though -- we need to look at it
  13188. more carefully to avoid flapping, and we likely need to wait til
  13189. 0.1.1.x is obsolete.
  13190. - Drop compatibility with obsolete Tors that permit create cells
  13191. to have the wrong circ_id_type.
  13192. - Re-enable per-connection rate limiting. Get rid of the "OP
  13193. bandwidth" concept. Lay groundwork for "bandwidth classes" --
  13194. separate global buckets that apply depending on what sort of conn
  13195. it is.
  13196. - Start publishing one minute or so after we find our ORPort
  13197. to be reachable. This will help reduce the number of descriptors
  13198. we have for ourselves floating around, since it's quite likely
  13199. other things (e.g. DirPort) will change during that minute too.
  13200. - Fork the v1 directory protocol into its own spec document,
  13201. and mark dir-spec.txt as the currently correct (v2) spec.
  13202. o Major bugfixes:
  13203. - When we find our DirPort to be reachable, publish a new descriptor
  13204. so we'll tell the world (reported by pnx).
  13205. - Publish a new descriptor after we hup/reload. This is important
  13206. if our config has changed such that we'll want to start advertising
  13207. our DirPort now, etc.
  13208. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  13209. - When we have a state file we cannot parse, tell the user and
  13210. move it aside. Now we avoid situations where the user starts
  13211. Tor in 1904, Tor writes a state file with that timestamp in it,
  13212. the user fixes her clock, and Tor refuses to start.
  13213. - Fix configure.in to not produce broken configure files with
  13214. more recent versions of autoconf. Thanks to Clint for his auto*
  13215. voodoo.
  13216. - "tor --verify-config" now exits with -1(255) or 0 depending on
  13217. whether the config options are bad or good.
  13218. - Resolve bug 321 when using dnsworkers: append a period to every
  13219. address we resolve at the exit node, so that we do not accidentally
  13220. pick up local addresses, and so that failing searches are retried
  13221. in the resolver search domains. (This is already solved for
  13222. eventdns.) (This breaks Blossom servers for now.)
  13223. - If we are using an exit enclave and we can't connect, e.g. because
  13224. its webserver is misconfigured to not listen on localhost, then
  13225. back off and try connecting from somewhere else before we fail.
  13226. o Minor bugfixes:
  13227. - Start compiling on MinGW on Windows (patches from Mike Chiussi).
  13228. - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
  13229. - Fix bug 314: Tor clients issued "unsafe socks" warnings even
  13230. when the IP address is mapped through MapAddress to a hostname.
  13231. - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
  13232. useless IPv6 DNS resolves.
  13233. - Patch suggested by Karsten Loesing: respond to SIGNAL command
  13234. before we execute the signal, in case the signal shuts us down.
  13235. - Clean up AllowInvalidNodes man page entry.
  13236. - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
  13237. - Add more asserts to track down an assert error on a windows Tor
  13238. server with connection_add being called with socket == -1.
  13239. - Handle reporting OR_CONN_EVENT_NEW events to the controller.
  13240. - Fix misleading log messages: an entry guard that is "unlisted",
  13241. as well as not known to be "down" (because we've never heard
  13242. of it), is not therefore "up".
  13243. - Remove code to special-case "-cvs" ending, since it has not
  13244. actually mattered since 0.0.9.
  13245. - Make our socks5 handling more robust to broken socks clients:
  13246. throw out everything waiting on the buffer in between socks
  13247. handshake phases, since they can't possibly (so the theory
  13248. goes) have predicted what we plan to respond to them.
  13249. Changes in version 0.1.1.23 - 2006-07-30
  13250. o Major bugfixes:
  13251. - Fast Tor servers, especially exit nodes, were triggering asserts
  13252. due to a bug in handling the list of pending DNS resolves. Some
  13253. bugs still remain here; we're hunting them.
  13254. - Entry guards could crash clients by sending unexpected input.
  13255. - More fixes on reachability testing: if you find yourself reachable,
  13256. then don't ever make any client requests (so you stop predicting
  13257. circuits), then hup or have your clock jump, then later your IP
  13258. changes, you won't think circuits are working, so you won't try to
  13259. test reachability, so you won't publish.
  13260. o Minor bugfixes:
  13261. - Avoid a crash if the controller does a resetconf firewallports
  13262. and then a setconf fascistfirewall=1.
  13263. - Avoid an integer underflow when the dir authority decides whether
  13264. a router is stable: we might wrongly label it stable, and compute
  13265. a slightly wrong median stability, when a descriptor is published
  13266. later than now.
  13267. - Fix a place where we might trigger an assert if we can't build our
  13268. own server descriptor yet.
  13269. Changes in version 0.1.1.22 - 2006-07-05
  13270. o Major bugfixes:
  13271. - Fix a big bug that was causing servers to not find themselves
  13272. reachable if they changed IP addresses. Since only 0.1.1.22+
  13273. servers can do reachability testing correctly, now we automatically
  13274. make sure to test via one of these.
  13275. - Fix to allow clients and mirrors to learn directory info from
  13276. descriptor downloads that get cut off partway through.
  13277. - Directory authorities had a bug in deciding if a newly published
  13278. descriptor was novel enough to make everybody want a copy -- a few
  13279. servers seem to be publishing new descriptors many times a minute.
  13280. o Minor bugfixes:
  13281. - Fix a rare bug that was causing some servers to complain about
  13282. "closing wedged cpuworkers" and skip some circuit create requests.
  13283. - Make the Exit flag in directory status documents actually work.
  13284. Changes in version 0.1.1.21 - 2006-06-10
  13285. o Crash and assert fixes from 0.1.1.20:
  13286. - Fix a rare crash on Tor servers that have enabled hibernation.
  13287. - Fix a seg fault on startup for Tor networks that use only one
  13288. directory authority.
  13289. - Fix an assert from a race condition that occurs on Tor servers
  13290. while exiting, where various threads are trying to log that they're
  13291. exiting, and delete the logs, at the same time.
  13292. - Make our unit tests pass again on certain obscure platforms.
  13293. o Other fixes:
  13294. - Add support for building SUSE RPM packages.
  13295. - Speed up initial bootstrapping for clients: if we are making our
  13296. first ever connection to any entry guard, then don't mark it down
  13297. right after that.
  13298. - When only one Tor server in the network is labelled as a guard,
  13299. and we've already picked him, we would cycle endlessly picking him
  13300. again, being unhappy about it, etc. Now we specifically exclude
  13301. current guards when picking a new guard.
  13302. - Servers send create cells more reliably after the TLS connection
  13303. is established: we were sometimes forgetting to send half of them
  13304. when we had more than one pending.
  13305. - If we get a create cell that asks us to extend somewhere, but the
  13306. Tor server there doesn't match the expected digest, we now send
  13307. a destroy cell back, rather than silently doing nothing.
  13308. - Make options->RedirectExit work again.
  13309. - Make cookie authentication for the controller work again.
  13310. - Stop being picky about unusual characters in the arguments to
  13311. mapaddress. It's none of our business.
  13312. - Add a new config option "TestVia" that lets you specify preferred
  13313. middle hops to use for test circuits. Perhaps this will let me
  13314. debug the reachability problems better.
  13315. o Log / documentation fixes:
  13316. - If we're a server and some peer has a broken TLS certificate, don't
  13317. log about it unless ProtocolWarnings is set, i.e., we want to hear
  13318. about protocol violations by others.
  13319. - Fix spelling of VirtualAddrNetwork in man page.
  13320. - Add a better explanation at the top of the autogenerated torrc file
  13321. about what happened to our old torrc.
  13322. Changes in version 0.1.1.20 - 2006-05-23
  13323. o Bugfixes:
  13324. - Downgrade a log severity where servers complain that they're
  13325. invalid.
  13326. - Avoid a compile warning on FreeBSD.
  13327. - Remove string size limit on NEWDESC messages; solve bug 291.
  13328. - Correct the RunAsDaemon entry in the man page; ignore RunAsDaemon
  13329. more thoroughly when we're running on windows.
  13330. Changes in version 0.1.1.19-rc - 2006-05-03
  13331. o Minor bugs:
  13332. - Regenerate our local descriptor if it's dirty and we try to use
  13333. it locally (e.g. if it changes during reachability detection).
  13334. - If we setconf our ORPort to 0, we continued to listen on the
  13335. old ORPort and receive connections.
  13336. - Avoid a second warning about machine/limits.h on Debian
  13337. GNU/kFreeBSD.
  13338. - Be willing to add our own routerinfo into the routerlist.
  13339. Now authorities will include themselves in their directories
  13340. and network-statuses.
  13341. - Stop trying to upload rendezvous descriptors to every
  13342. directory authority: only try the v1 authorities.
  13343. - Servers no longer complain when they think they're not
  13344. registered with the directory authorities. There were too many
  13345. false positives.
  13346. - Backport dist-rpm changes so rpms can be built without errors.
  13347. o Features:
  13348. - Implement an option, VirtualAddrMask, to set which addresses
  13349. get handed out in response to mapaddress requests. This works
  13350. around a bug in tsocks where 127.0.0.0/8 is never socksified.
  13351. Changes in version 0.1.1.18-rc - 2006-04-10
  13352. o Major fixes:
  13353. - Work harder to download live network-statuses from all the
  13354. directory authorities we know about. Improve the threshold
  13355. decision logic so we're more robust to edge cases.
  13356. - When fetching rendezvous descriptors, we were willing to ask
  13357. v2 authorities too, which would always return 404.
  13358. o Minor fixes:
  13359. - Stop listing down or invalid nodes in the v1 directory. This will
  13360. reduce its bulk by about 1/3, and reduce load on directory
  13361. mirrors.
  13362. - When deciding whether a router is Fast or Guard-worthy, consider
  13363. his advertised BandwidthRate and not just the BandwidthCapacity.
  13364. - No longer ship INSTALL and README files -- they are useless now.
  13365. - Force rpmbuild to behave and honor target_cpu.
  13366. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
  13367. - Start to include translated versions of the tor-doc-*.html
  13368. files, along with the screenshots. Still needs more work.
  13369. - Start sending back 512 and 451 errors if mapaddress fails,
  13370. rather than not sending anything back at all.
  13371. - When we fail to bind or listen on an incoming or outgoing
  13372. socket, we should close it before failing. otherwise we just
  13373. leak it. (thanks to weasel for finding.)
  13374. - Allow "getinfo dir/status/foo" to work, as long as your DirPort
  13375. is enabled. (This is a hack, and will be fixed in 0.1.2.x.)
  13376. - Make NoPublish (even though deprecated) work again.
  13377. - Fix a minor security flaw where a versioning auth dirserver
  13378. could list a recommended version many times in a row to make
  13379. clients more convinced that it's recommended.
  13380. - Fix crash bug if there are two unregistered servers running
  13381. with the same nickname, one of them is down, and you ask for
  13382. them by nickname in your EntryNodes or ExitNodes. Also, try
  13383. to pick the one that's running rather than an arbitrary one.
  13384. - Fix an infinite loop we could hit if we go offline for too long.
  13385. - Complain when we hit WSAENOBUFS on recv() or write() too.
  13386. Perhaps this will help us hunt the bug.
  13387. - If you're not a versioning dirserver, don't put the string
  13388. "client-versions \nserver-versions \n" in your network-status.
  13389. - Lower the minimum required number of file descriptors to 1000,
  13390. so we can have some overhead for Valgrind on Linux, where the
  13391. default ulimit -n is 1024.
  13392. o New features:
  13393. - Add tor.dizum.com as the fifth authoritative directory server.
  13394. - Add a new config option FetchUselessDescriptors, off by default,
  13395. for when you plan to run "exitlist" on your client and you want
  13396. to know about even the non-running descriptors.
  13397. Changes in version 0.1.1.17-rc - 2006-03-28
  13398. o Major fixes:
  13399. - Clients and servers since 0.1.1.10-alpha have been expiring
  13400. connections whenever they are idle for 5 minutes and they *do*
  13401. have circuits on them. Oops. With this new version, clients will
  13402. discard their previous entry guard choices and avoid choosing
  13403. entry guards running these flawed versions.
  13404. - Fix memory leak when uncompressing concatenated zlib streams. This
  13405. was causing substantial leaks over time on Tor servers.
  13406. - The v1 directory was including servers as much as 48 hours old,
  13407. because that's how the new routerlist->routers works. Now only
  13408. include them if they're 20 hours old or less.
  13409. o Minor fixes:
  13410. - Resume building on irix64, netbsd 2.0, etc.
  13411. - On non-gcc compilers (e.g. solaris), use "-g -O" instead of
  13412. "-Wall -g -O2".
  13413. - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
  13414. and it is confusing some users.
  13415. - Mirrors stop caching the v1 directory so often.
  13416. - Make the max number of old descriptors that a cache will hold
  13417. rise with the number of directory authorities, so we can scale.
  13418. - Change our win32 uname() hack to be more forgiving about what
  13419. win32 versions it thinks it's found.
  13420. o New features:
  13421. - Add lefkada.eecs.harvard.edu as a fourth authoritative directory
  13422. server.
  13423. - When the controller's *setconf commands fail, collect an error
  13424. message in a string and hand it back to the controller.
  13425. - Make the v2 dir's "Fast" flag based on relative capacity, just
  13426. like "Stable" is based on median uptime. Name everything in the
  13427. top 7/8 Fast, and only the top 1/2 gets to be a Guard.
  13428. - Log server fingerprint on startup, so new server operators don't
  13429. have to go hunting around their filesystem for it.
  13430. - Return a robots.txt on our dirport to discourage google indexing.
  13431. - Let the controller ask for GETINFO dir/status/foo so it can ask
  13432. directly rather than connecting to the dir port. Only works when
  13433. dirport is set for now.
  13434. o New config options rather than constants in the code:
  13435. - SocksTimeout: How long do we let a socks connection wait
  13436. unattached before we fail it?
  13437. - CircuitBuildTimeout: Cull non-open circuits that were born
  13438. at least this many seconds ago.
  13439. - CircuitIdleTimeout: Cull open clean circuits that were born
  13440. at least this many seconds ago.
  13441. Changes in version 0.1.1.16-rc - 2006-03-18
  13442. o Bugfixes on 0.1.1.15-rc:
  13443. - Fix assert when the controller asks to attachstream a connect-wait
  13444. or resolve-wait stream.
  13445. - Now do address rewriting when the controller asks us to attach
  13446. to a particular circuit too. This will let Blossom specify
  13447. "moria2.exit" without having to learn what moria2's IP address is.
  13448. - Make the "tor --verify-config" command-line work again, so people
  13449. can automatically check if their torrc will parse.
  13450. - Authoritative dirservers no longer require an open connection from
  13451. a server to consider him "reachable". We need this change because
  13452. when we add new auth dirservers, old servers won't know not to
  13453. hang up on them.
  13454. - Let Tor build on Sun CC again.
  13455. - Fix an off-by-one buffer size in dirserv.c that magically never
  13456. hit our three authorities but broke sjmurdoch's own tor network.
  13457. - If we as a directory mirror don't know of any v1 directory
  13458. authorities, then don't try to cache any v1 directories.
  13459. - Stop warning about unknown servers in our family when they are
  13460. given as hex digests.
  13461. - Stop complaining as quickly to the server operator that he
  13462. hasn't registered his nickname/key binding.
  13463. - Various cleanups so we can add new V2 Auth Dirservers.
  13464. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
  13465. reflect the updated flags in our v2 dir protocol.
  13466. - Resume allowing non-printable characters for exit streams (both
  13467. for connecting and for resolving). Now we tolerate applications
  13468. that don't follow the RFCs. But continue to block malformed names
  13469. at the socks side.
  13470. o Bugfixes on 0.1.0.x:
  13471. - Fix assert bug in close_logs(): when we close and delete logs,
  13472. remove them all from the global "logfiles" list.
  13473. - Fix minor integer overflow in calculating when we expect to use up
  13474. our bandwidth allocation before hibernating.
  13475. - Fix a couple of bugs in OpenSSL detection. Also, deal better when
  13476. there are multiple SSLs installed with different versions.
  13477. - When we try to be a server and Address is not explicitly set and
  13478. our hostname resolves to a private IP address, try to use an
  13479. interface address if it has a public address. Now Windows machines
  13480. that think of themselves as localhost can work by default.
  13481. o New features:
  13482. - Let the controller ask for GETINFO dir/server/foo so it can ask
  13483. directly rather than connecting to the dir port.
  13484. - Let the controller tell us about certain router descriptors
  13485. that it doesn't want Tor to use in circuits. Implement
  13486. SETROUTERPURPOSE and modify +POSTDESCRIPTOR to do this.
  13487. - New config option SafeSocks to reject all application connections
  13488. using unsafe socks protocols. Defaults to off.
  13489. Changes in version 0.1.1.15-rc - 2006-03-11
  13490. o Bugfixes and cleanups:
  13491. - When we're printing strings from the network, don't try to print
  13492. non-printable characters. This protects us against shell escape
  13493. sequence exploits, and also against attacks to fool humans into
  13494. misreading their logs.
  13495. - Fix a bug where Tor would fail to establish any connections if you
  13496. left it off for 24 hours and then started it: we were happy with
  13497. the obsolete network statuses, but they all referred to router
  13498. descriptors that were too old to fetch, so we ended up with no
  13499. valid router descriptors.
  13500. - Fix a seg fault in the controller's "getinfo orconn-status"
  13501. command while listing status on incoming handshaking connections.
  13502. Introduce a status name "NEW" for these connections.
  13503. - If we get a linelist or linelist_s config option from the torrc
  13504. (e.g. ExitPolicy) and it has no value, warn and skip rather than
  13505. silently resetting it to its default.
  13506. - Don't abandon entry guards until they've been down or gone for
  13507. a whole month.
  13508. - Cleaner and quieter log messages.
  13509. o New features:
  13510. - New controller signal NEWNYM that makes new application requests
  13511. use clean circuits.
  13512. - Add a new circuit purpose 'controller' to let the controller ask
  13513. for a circuit that Tor won't try to use. Extend the EXTENDCIRCUIT
  13514. controller command to let you specify the purpose if you're
  13515. starting a new circuit. Add a new SETCIRCUITPURPOSE controller
  13516. command to let you change a circuit's purpose after it's been
  13517. created.
  13518. - Accept "private:*" in routerdesc exit policies; not generated yet
  13519. because older Tors do not understand it.
  13520. - Add BSD-style contributed startup script "rc.subr" from Peter
  13521. Thoenen.
  13522. Changes in version 0.1.1.14-alpha - 2006-02-20
  13523. o Bugfixes on 0.1.1.x:
  13524. - Don't die if we ask for a stdout or stderr log (even implicitly)
  13525. and we're set to RunAsDaemon -- just warn.
  13526. - We still had a few bugs in the OR connection rotation code that
  13527. caused directory servers to slowly aggregate connections to other
  13528. fast Tor servers. This time for sure!
  13529. - Make log entries on Win32 include the name of the function again.
  13530. - We were treating a pair of exit policies if they were equal even
  13531. if one said accept and the other said reject -- causing us to
  13532. not always publish a new descriptor since we thought nothing
  13533. had changed.
  13534. - Retry pending server downloads as well as pending networkstatus
  13535. downloads when we unexpectedly get a socks request.
  13536. - We were ignoring the IS_FAST flag in the directory status,
  13537. meaning we were willing to pick trivial-bandwidth nodes for "fast"
  13538. connections.
  13539. - If the controller's SAVECONF command fails (e.g. due to file
  13540. permissions), let the controller know that it failed.
  13541. o Features:
  13542. - If we're trying to be a Tor server and running Windows 95/98/ME
  13543. as a server, explain that we'll likely crash.
  13544. - When we're a server, a client asks for an old-style directory,
  13545. and our write bucket is empty, don't give it to him. This way
  13546. small servers can continue to serve the directory *sometimes*,
  13547. without getting overloaded.
  13548. - Compress exit policies even more -- look for duplicate lines
  13549. and remove them.
  13550. - Clients now honor the "guard" flag in the router status when
  13551. picking entry guards, rather than looking at is_fast or is_stable.
  13552. - Retain unrecognized lines in $DATADIR/state file, so that we can
  13553. be forward-compatible.
  13554. - Generate 18.0.0.0/8 address policy format in descs when we can;
  13555. warn when the mask is not reducible to a bit-prefix.
  13556. - Let the user set ControlListenAddress in the torrc. This can be
  13557. dangerous, but there are some cases (like a secured LAN) where it
  13558. makes sense.
  13559. - Split ReachableAddresses into ReachableDirAddresses and
  13560. ReachableORAddresses, so we can restrict Dir conns to port 80
  13561. and OR conns to port 443.
  13562. - Now we can target arch and OS in rpm builds (contributed by
  13563. Phobos). Also make the resulting dist-rpm filename match the
  13564. target arch.
  13565. - New config options to help controllers: FetchServerDescriptors
  13566. and FetchHidServDescriptors for whether to fetch server
  13567. info and hidserv info or let the controller do it, and
  13568. PublishServerDescriptor and PublishHidServDescriptors.
  13569. - Also let the controller set the __AllDirActionsPrivate config
  13570. option if you want all directory fetches/publishes to happen via
  13571. Tor (it assumes your controller bootstraps your circuits).
  13572. Changes in version 0.1.0.17 - 2006-02-17
  13573. o Crash bugfixes on 0.1.0.x:
  13574. - When servers with a non-zero DirPort came out of hibernation,
  13575. sometimes they would trigger an assert.
  13576. o Other important bugfixes:
  13577. - On platforms that don't have getrlimit (like Windows), we were
  13578. artificially constraining ourselves to a max of 1024
  13579. connections. Now just assume that we can handle as many as 15000
  13580. connections. Hopefully this won't cause other problems.
  13581. o Backported features:
  13582. - When we're a server, a client asks for an old-style directory,
  13583. and our write bucket is empty, don't give it to him. This way
  13584. small servers can continue to serve the directory *sometimes*,
  13585. without getting overloaded.
  13586. - Whenever you get a 503 in response to a directory fetch, try
  13587. once more. This will become important once servers start sending
  13588. 503's whenever they feel busy.
  13589. - Fetch a new directory every 120 minutes, not every 40 minutes.
  13590. Now that we have hundreds of thousands of users running the old
  13591. directory algorithm, it's starting to hurt a lot.
  13592. - Bump up the period for forcing a hidden service descriptor upload
  13593. from 20 minutes to 1 hour.
  13594. Changes in version 0.1.1.13-alpha - 2006-02-09
  13595. o Crashes in 0.1.1.x:
  13596. - When you tried to setconf ORPort via the controller, Tor would
  13597. crash. So people using TorCP to become a server were sad.
  13598. - Solve (I hope) the stack-smashing bug that we were seeing on fast
  13599. servers. The problem appears to be something do with OpenSSL's
  13600. random number generation, or how we call it, or something. Let me
  13601. know if the crashes continue.
  13602. - Turn crypto hardware acceleration off by default, until we find
  13603. somebody smart who can test it for us. (It appears to produce
  13604. seg faults in at least some cases.)
  13605. - Fix a rare assert error when we've tried all intro points for
  13606. a hidden service and we try fetching the service descriptor again:
  13607. "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed"
  13608. o Major fixes:
  13609. - Fix a major load balance bug: we were round-robining in 16 KB
  13610. chunks, and servers with bandwidthrate of 20 KB, while downloading
  13611. a 600 KB directory, would starve their other connections. Now we
  13612. try to be a bit more fair.
  13613. - Dir authorities and mirrors were never expiring the newest
  13614. descriptor for each server, causing memory and directory bloat.
  13615. - Fix memory-bloating and connection-bloating bug on servers: We
  13616. were never closing any connection that had ever had a circuit on
  13617. it, because we were checking conn->n_circuits == 0, yet we had a
  13618. bug that let it go negative.
  13619. - Make Tor work using squid as your http proxy again -- squid
  13620. returns an error if you ask for a URL that's too long, and it uses
  13621. a really generic error message. Plus, many people are behind a
  13622. transparent squid so they don't even realize it.
  13623. - On platforms that don't have getrlimit (like Windows), we were
  13624. artificially constraining ourselves to a max of 1024
  13625. connections. Now just assume that we can handle as many as 15000
  13626. connections. Hopefully this won't cause other problems.
  13627. - Add a new config option ExitPolicyRejectPrivate which defaults to
  13628. 1. This means all exit policies will begin with rejecting private
  13629. addresses, unless the server operator explicitly turns it off.
  13630. o Major features:
  13631. - Clients no longer download descriptors for non-running
  13632. descriptors.
  13633. - Before we add new directory authorities, we should make it
  13634. clear that only v1 authorities should receive/publish hidden
  13635. service descriptors.
  13636. o Minor features:
  13637. - As soon as we've fetched some more directory info, immediately
  13638. try to download more server descriptors. This way we don't have
  13639. a 10 second pause during initial bootstrapping.
  13640. - Remove even more loud log messages that the server operator can't
  13641. do anything about.
  13642. - When we're running an obsolete or un-recommended version, make
  13643. the log message more clear about what the problem is and what
  13644. versions *are* still recommended.
  13645. - Provide a more useful warn message when our onion queue gets full:
  13646. the CPU is too slow or the exit policy is too liberal.
  13647. - Don't warn when we receive a 503 from a dirserver/cache -- this
  13648. will pave the way for them being able to refuse if they're busy.
  13649. - When we fail to bind a listener, try to provide a more useful
  13650. log message: e.g., "Is Tor already running?"
  13651. - Adjust tor-spec to parameterize cell and key lengths. Now Ian
  13652. Goldberg can prove things about our handshake protocol more
  13653. easily.
  13654. - MaxConn has been obsolete for a while now. Document the ConnLimit
  13655. config option, which is a *minimum* number of file descriptors
  13656. that must be available else Tor refuses to start.
  13657. - Apply Matt Ghali's --with-syslog-facility patch to ./configure
  13658. if you log to syslog and want something other than LOG_DAEMON.
  13659. - Make dirservers generate a separate "guard" flag to mean,
  13660. "would make a good entry guard". Make clients parse it and vote
  13661. on it. Not used by clients yet.
  13662. - Implement --with-libevent-dir option to ./configure. Also, improve
  13663. search techniques to find libevent, and use those for openssl too.
  13664. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB
  13665. - Only start testing reachability once we've established a
  13666. circuit. This will make startup on dirservers less noisy.
  13667. - Don't try to upload hidden service descriptors until we have
  13668. established a circuit.
  13669. - Fix the controller's "attachstream 0" command to treat conn like
  13670. it just connected, doing address remapping, handling .exit and
  13671. .onion idioms, and so on. Now we're more uniform in making sure
  13672. that the controller hears about new and closing connections.
  13673. Changes in version 0.1.1.12-alpha - 2006-01-11
  13674. o Bugfixes on 0.1.1.x:
  13675. - The fix to close duplicate server connections was closing all
  13676. Tor client connections if they didn't establish a circuit
  13677. quickly enough. Oops.
  13678. - Fix minor memory issue (double-free) that happened on exit.
  13679. o Bugfixes on 0.1.0.x:
  13680. - Tor didn't warn when it failed to open a log file.
  13681. Changes in version 0.1.1.11-alpha - 2006-01-10
  13682. o Crashes in 0.1.1.x:
  13683. - Include all the assert/crash fixes from 0.1.0.16.
  13684. - If you start Tor and then quit very quickly, there were some
  13685. races that tried to free things that weren't allocated yet.
  13686. - Fix a rare memory stomp if you're running hidden services.
  13687. - Fix segfault when specifying DirServer in config without nickname.
  13688. - Fix a seg fault when you finish connecting to a server but at
  13689. that moment you dump his server descriptor.
  13690. - Extendcircuit and Attachstream controller commands would
  13691. assert/crash if you don't give them enough arguments.
  13692. - Fix an assert error when we're out of space in the connection_list
  13693. and we try to post a hidden service descriptor (reported by weasel).
  13694. - If you specify a relative torrc path and you set RunAsDaemon in
  13695. your torrc, then it chdir()'s to the new directory. If you HUP,
  13696. it tries to load the new torrc location, fails, and exits.
  13697. The fix: no longer allow a relative path to torrc using -f.
  13698. o Major features:
  13699. - Implement "entry guards": automatically choose a handful of entry
  13700. nodes and stick with them for all circuits. Only pick new guards
  13701. when the ones you have are unsuitable, and if the old guards
  13702. become suitable again, switch back. This will increase security
  13703. dramatically against certain end-point attacks. The EntryNodes
  13704. config option now provides some hints about which entry guards you
  13705. want to use most; and StrictEntryNodes means to only use those.
  13706. - New directory logic: download by descriptor digest, not by
  13707. fingerprint. Caches try to download all listed digests from
  13708. authorities; clients try to download "best" digests from caches.
  13709. This avoids partitioning and isolating attacks better.
  13710. - Make the "stable" router flag in network-status be the median of
  13711. the uptimes of running valid servers, and make clients pay
  13712. attention to the network-status flags. Thus the cutoff adapts
  13713. to the stability of the network as a whole, making IRC, IM, etc
  13714. connections more reliable.
  13715. o Major fixes:
  13716. - Tor servers with dynamic IP addresses were needing to wait 18
  13717. hours before they could start doing reachability testing using
  13718. the new IP address and ports. This is because they were using
  13719. the internal descriptor to learn what to test, yet they were only
  13720. rebuilding the descriptor once they decided they were reachable.
  13721. - Tor 0.1.1.9 and 0.1.1.10 had a serious bug that caused clients
  13722. to download certain server descriptors, throw them away, and then
  13723. fetch them again after 30 minutes. Now mirrors throw away these
  13724. server descriptors so clients can't get them.
  13725. - We were leaving duplicate connections to other ORs open for a week,
  13726. rather than closing them once we detect a duplicate. This only
  13727. really affected authdirservers, but it affected them a lot.
  13728. - Spread the authdirservers' reachability testing over the entire
  13729. testing interval, so we don't try to do 500 TLS's at once every
  13730. 20 minutes.
  13731. o Minor fixes:
  13732. - If the network is down, and we try to connect to a conn because
  13733. we have a circuit in mind, and we timeout (30 seconds) because the
  13734. network never answers, we were expiring the circuit, but we weren't
  13735. obsoleting the connection or telling the entry_guards functions.
  13736. - Some Tor servers process billions of cells per day. These statistics
  13737. need to be uint64_t's.
  13738. - Check for integer overflows in more places, when adding elements
  13739. to smartlists. This could possibly prevent a buffer overflow
  13740. on malicious huge inputs. I don't see any, but I haven't looked
  13741. carefully.
  13742. - ReachableAddresses kept growing new "reject *:*" lines on every
  13743. setconf/reload.
  13744. - When you "setconf log" via the controller, it should remove all
  13745. logs. We were automatically adding back in a "log notice stdout".
  13746. - Newly bootstrapped Tor networks couldn't establish hidden service
  13747. circuits until they had nodes with high uptime. Be more tolerant.
  13748. - We were marking servers down when they could not answer every piece
  13749. of the directory request we sent them. This was far too harsh.
  13750. - Fix the torify (tsocks) config file to not use Tor for localhost
  13751. connections.
  13752. - Directory authorities now go to the proper authority when asking for
  13753. a networkstatus, even when they want a compressed one.
  13754. - Fix a harmless bug that was causing Tor servers to log
  13755. "Got an end because of misc error, but we're not an AP. Closing."
  13756. - Authorities were treating their own descriptor changes as cosmetic,
  13757. meaning the descriptor available in the network-status and the
  13758. descriptor that clients downloaded were different.
  13759. - The OS X installer was adding a symlink for tor_resolve but
  13760. the binary was called tor-resolve (reported by Thomas Hardly).
  13761. - Workaround a problem with some http proxies where they refuse GET
  13762. requests that specify "Content-Length: 0" (reported by Adrian).
  13763. - Fix wrong log message when you add a "HiddenServiceNodes" config
  13764. line without any HiddenServiceDir line (reported by Chris Thomas).
  13765. o Minor features:
  13766. - Write the TorVersion into the state file so we have a prayer of
  13767. keeping forward and backward compatibility.
  13768. - Revive the FascistFirewall config option rather than eliminating it:
  13769. now it's a synonym for ReachableAddresses *:80,*:443.
  13770. - Clients choose directory servers from the network status lists,
  13771. not from their internal list of router descriptors. Now they can
  13772. go to caches directly rather than needing to go to authorities
  13773. to bootstrap.
  13774. - Directory authorities ignore router descriptors that have only
  13775. cosmetic differences: do this for 0.1.0.x servers now too.
  13776. - Add a new flag to network-status indicating whether the server
  13777. can answer v2 directory requests too.
  13778. - Authdirs now stop whining so loudly about bad descriptors that
  13779. they fetch from other dirservers. So when there's a log complaint,
  13780. it's for sure from a freshly uploaded descriptor.
  13781. - Reduce memory requirements in our structs by changing the order
  13782. of fields.
  13783. - There used to be two ways to specify your listening ports in a
  13784. server descriptor: on the "router" line and with a separate "ports"
  13785. line. Remove support for the "ports" line.
  13786. - New config option "AuthDirRejectUnlisted" for auth dirservers as
  13787. a panic button: if we get flooded with unusable servers we can
  13788. revert to only listing servers in the approved-routers file.
  13789. - Auth dir servers can now mark a fingerprint as "!reject" or
  13790. "!invalid" in the approved-routers file (as its nickname), to
  13791. refuse descriptors outright or include them but marked as invalid.
  13792. - Servers store bandwidth history across restarts/crashes.
  13793. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
  13794. get a better idea of why their circuits failed. Not used yet.
  13795. - Directory mirrors now cache up to 16 unrecognized network-status
  13796. docs. Now we can add new authdirservers and they'll be cached too.
  13797. - When picking a random directory, prefer non-authorities if any
  13798. are known.
  13799. - New controller option "getinfo desc/all-recent" to fetch the
  13800. latest server descriptor for every router that Tor knows about.
  13801. Changes in version 0.1.0.16 - 2006-01-02
  13802. o Crash bugfixes on 0.1.0.x:
  13803. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  13804. corrupting the heap, losing FDs, or crashing when we need to resize
  13805. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  13806. - It turns out sparc64 platforms crash on unaligned memory access
  13807. too -- so detect and avoid this.
  13808. - Handle truncated compressed data correctly (by detecting it and
  13809. giving an error).
  13810. - Fix possible-but-unlikely free(NULL) in control.c.
  13811. - When we were closing connections, there was a rare case that
  13812. stomped on memory, triggering seg faults and asserts.
  13813. - Avoid potential infinite recursion when building a descriptor. (We
  13814. don't know that it ever happened, but better to fix it anyway.)
  13815. - We were neglecting to unlink marked circuits from soon-to-close OR
  13816. connections, which caused some rare scribbling on freed memory.
  13817. - Fix a memory stomping race bug when closing the joining point of two
  13818. rendezvous circuits.
  13819. - Fix an assert in time parsing found by Steven Murdoch.
  13820. o Other bugfixes on 0.1.0.x:
  13821. - When we're doing reachability testing, provide more useful log
  13822. messages so the operator knows what to expect.
  13823. - Do not check whether DirPort is reachable when we are suppressing
  13824. advertising it because of hibernation.
  13825. - When building with -static or on Solaris, we sometimes needed -ldl.
  13826. - When we're deciding whether a stream has enough circuits around
  13827. that can handle it, count the freshly dirty ones and not the ones
  13828. that are so dirty they won't be able to handle it.
  13829. - When we're expiring old circuits, we had a logic error that caused
  13830. us to close new rendezvous circuits rather than old ones.
  13831. - Give a more helpful log message when you try to change ORPort via
  13832. the controller: you should upgrade Tor if you want that to work.
  13833. - We were failing to parse Tor versions that start with "Tor ".
  13834. - Tolerate faulty streams better: when a stream fails for reason
  13835. exitpolicy, stop assuming that the router is lying about his exit
  13836. policy. When a stream fails for reason misc, allow it to retry just
  13837. as if it was resolvefailed. When a stream has failed three times,
  13838. reset its failure count so we can try again and get all three tries.
  13839. Changes in version 0.1.1.10-alpha - 2005-12-11
  13840. o Correctness bugfixes on 0.1.0.x:
  13841. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  13842. corrupting the heap, losing FDs, or crashing when we need to resize
  13843. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  13844. - Stop doing the complex voodoo overkill checking for insecure
  13845. Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
  13846. - When we were closing connections, there was a rare case that
  13847. stomped on memory, triggering seg faults and asserts.
  13848. - We were neglecting to unlink marked circuits from soon-to-close OR
  13849. connections, which caused some rare scribbling on freed memory.
  13850. - When we're deciding whether a stream has enough circuits around
  13851. that can handle it, count the freshly dirty ones and not the ones
  13852. that are so dirty they won't be able to handle it.
  13853. - Recover better from TCP connections to Tor servers that are
  13854. broken but don't tell you (it happens!); and rotate TLS
  13855. connections once a week.
  13856. - When we're expiring old circuits, we had a logic error that caused
  13857. us to close new rendezvous circuits rather than old ones.
  13858. - Fix a scary-looking but apparently harmless bug where circuits
  13859. would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
  13860. servers, and never switch to state CIRCUIT_STATE_OPEN.
  13861. - When building with -static or on Solaris, we sometimes needed to
  13862. build with -ldl.
  13863. - Give a useful message when people run Tor as the wrong user,
  13864. rather than telling them to start chowning random directories.
  13865. - We were failing to inform the controller about new .onion streams.
  13866. o Security bugfixes on 0.1.0.x:
  13867. - Refuse server descriptors if the fingerprint line doesn't match
  13868. the included identity key. Tor doesn't care, but other apps (and
  13869. humans) might actually be trusting the fingerprint line.
  13870. - We used to kill the circuit when we receive a relay command we
  13871. don't recognize. Now we just drop it.
  13872. - Start obeying our firewall options more rigorously:
  13873. . If we can't get to a dirserver directly, try going via Tor.
  13874. . Don't ever try to connect (as a client) to a place our
  13875. firewall options forbid.
  13876. . If we specify a proxy and also firewall options, obey the
  13877. firewall options even when we're using the proxy: some proxies
  13878. can only proxy to certain destinations.
  13879. - Fix a bug found by Lasse Overlier: when we were making internal
  13880. circuits (intended to be cannibalized later for rendezvous and
  13881. introduction circuits), we were picking them so that they had
  13882. useful exit nodes. There was no need for this, and it actually
  13883. aids some statistical attacks.
  13884. - Start treating internal circuits and exit circuits separately.
  13885. It's important to keep them separate because internal circuits
  13886. have their last hops picked like middle hops, rather than like
  13887. exit hops. So exiting on them will break the user's expectations.
  13888. o Bugfixes on 0.1.1.x:
  13889. - Take out the mis-feature where we tried to detect IP address
  13890. flapping for people with DynDNS, and chose not to upload a new
  13891. server descriptor sometimes.
  13892. - Try to be compatible with OpenSSL 0.9.6 again.
  13893. - Log fix: when the controller is logging about .onion addresses,
  13894. sometimes it didn't include the ".onion" part of the address.
  13895. - Don't try to modify options->DirServers internally -- if the
  13896. user didn't specify any, just add the default ones directly to
  13897. the trusted dirserver list. This fixes a bug where people running
  13898. controllers would use SETCONF on some totally unrelated config
  13899. option, and Tor would start yelling at them about changing their
  13900. DirServer lines.
  13901. - Let the controller's redirectstream command specify a port, in
  13902. case the controller wants to change that too.
  13903. - When we requested a pile of server descriptors, we sometimes
  13904. accidentally launched a duplicate request for the first one.
  13905. - Bugfix for trackhostexits: write down the fingerprint of the
  13906. chosen exit, not its nickname, because the chosen exit might not
  13907. be verified.
  13908. - When parsing foo.exit, if foo is unknown, and we are leaving
  13909. circuits unattached, set the chosen_exit field and leave the
  13910. address empty. This matters because controllers got confused
  13911. otherwise.
  13912. - Directory authorities no longer try to download server
  13913. descriptors that they know they will reject.
  13914. o Features and updates:
  13915. - Replace balanced trees with hash tables: this should make stuff
  13916. significantly faster.
  13917. - Resume using the AES counter-mode implementation that we ship,
  13918. rather than OpenSSL's. Ours is significantly faster.
  13919. - Many other CPU and memory improvements.
  13920. - Add a new config option FastFirstHopPK (on by default) so clients
  13921. do a trivial crypto handshake for their first hop, since TLS has
  13922. already taken care of confidentiality and authentication.
  13923. - Add a new config option TestSocks so people can see if their
  13924. applications are using socks4, socks4a, socks5-with-ip, or
  13925. socks5-with-hostname. This way they don't have to keep mucking
  13926. with tcpdump and wondering if something got cached somewhere.
  13927. - Warn when listening on a public address for socks. I suspect a
  13928. lot of people are setting themselves up as open socks proxies,
  13929. and they have no idea that jerks on the Internet are using them,
  13930. since they simply proxy the traffic into the Tor network.
  13931. - Add "private:*" as an alias in configuration for policies. Now
  13932. you can simplify your exit policy rather than needing to list
  13933. every single internal or nonroutable network space.
  13934. - Add a new controller event type that allows controllers to get
  13935. all server descriptors that were uploaded to a router in its role
  13936. as authoritative dirserver.
  13937. - Start shipping socks-extensions.txt, tor-doc-unix.html,
  13938. tor-doc-server.html, and stylesheet.css in the tarball.
  13939. - Stop shipping tor-doc.html in the tarball.
  13940. Changes in version 0.1.1.9-alpha - 2005-11-15
  13941. o Usability improvements:
  13942. - Start calling it FooListenAddress rather than FooBindAddress,
  13943. since few of our users know what it means to bind an address
  13944. or port.
  13945. - Reduce clutter in server logs. We're going to try to make
  13946. them actually usable now. New config option ProtocolWarnings that
  13947. lets you hear about how _other Tors_ are breaking the protocol. Off
  13948. by default.
  13949. - Divide log messages into logging domains. Once we put some sort
  13950. of interface on this, it will let people looking at more verbose
  13951. log levels specify the topics they want to hear more about.
  13952. - Make directory servers return better http 404 error messages
  13953. instead of a generic "Servers unavailable".
  13954. - Check for even more Windows version flags when writing the platform
  13955. string in server descriptors, and note any we don't recognize.
  13956. - Clean up more of the OpenSSL memory when exiting, so we can detect
  13957. memory leaks better.
  13958. - Make directory authorities be non-versioning, non-naming by
  13959. default. Now we can add new directory servers without requiring
  13960. their operators to pay close attention.
  13961. - When logging via syslog, include the pid whenever we provide
  13962. a log entry. Suggested by Todd Fries.
  13963. o Performance improvements:
  13964. - Directory servers now silently throw away new descriptors that
  13965. haven't changed much if the timestamps are similar. We do this to
  13966. tolerate older Tor servers that upload a new descriptor every 15
  13967. minutes. (It seemed like a good idea at the time.)
  13968. - Inline bottleneck smartlist functions; use fast versions by default.
  13969. - Add a "Map from digest to void*" abstraction digestmap_t so we
  13970. can do less hex encoding/decoding. Use it in router_get_by_digest()
  13971. to resolve a performance bottleneck.
  13972. - Allow tor_gzip_uncompress to extract as much as possible from
  13973. truncated compressed data. Try to extract as many
  13974. descriptors as possible from truncated http responses (when
  13975. DIR_PURPOSE_FETCH_ROUTERDESC).
  13976. - Make circ->onionskin a pointer, not a static array. moria2 was using
  13977. 125000 circuit_t's after it had been up for a few weeks, which
  13978. translates to 20+ megs of wasted space.
  13979. - The private half of our EDH handshake keys are now chosen out
  13980. of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
  13981. o Security improvements:
  13982. - Start making directory caches retain old routerinfos, so soon
  13983. clients can start asking by digest of descriptor rather than by
  13984. fingerprint of server.
  13985. - Add half our entropy from RAND_poll in OpenSSL. This knows how
  13986. to use egd (if present), openbsd weirdness (if present), vms/os2
  13987. weirdness (if we ever port there), and more in the future.
  13988. o Bugfixes on 0.1.0.x:
  13989. - Do round-robin writes of at most 16 kB per write. This might be
  13990. more fair on loaded Tor servers, and it might resolve our Windows
  13991. crash bug. It might also slow things down.
  13992. - Our TLS handshakes were generating a single public/private
  13993. keypair for the TLS context, rather than making a new one for
  13994. each new connections. Oops. (But we were still rotating them
  13995. periodically, so it's not so bad.)
  13996. - When we were cannibalizing a circuit with a particular exit
  13997. node in mind, we weren't checking to see if that exit node was
  13998. already present earlier in the circuit. Oops.
  13999. - When a Tor server's IP changes (e.g. from a dyndns address),
  14000. upload a new descriptor so clients will learn too.
  14001. - Really busy servers were keeping enough circuits open on stable
  14002. connections that they were wrapping around the circuit_id
  14003. space. (It's only two bytes.) This exposed a bug where we would
  14004. feel free to reuse a circuit_id even if it still exists but has
  14005. been marked for close. Try to fix this bug. Some bug remains.
  14006. - If we would close a stream early (e.g. it asks for a .exit that
  14007. we know would refuse it) but the LeaveStreamsUnattached config
  14008. option is set by the controller, then don't close it.
  14009. o Bugfixes on 0.1.1.8-alpha:
  14010. - Fix a big pile of memory leaks, some of them serious.
  14011. - Do not try to download a routerdesc if we would immediately reject
  14012. it as obsolete.
  14013. - Resume inserting a newline between all router descriptors when
  14014. generating (old style) signed directories, since our spec says
  14015. we do.
  14016. - When providing content-type application/octet-stream for
  14017. server descriptors using .z, we were leaving out the
  14018. content-encoding header. Oops. (Everything tolerated this just
  14019. fine, but that doesn't mean we need to be part of the problem.)
  14020. - Fix a potential seg fault in getconf and getinfo using version 1
  14021. of the controller protocol.
  14022. - Avoid crash: do not check whether DirPort is reachable when we
  14023. are suppressing it because of hibernation.
  14024. - Make --hash-password not crash on exit.
  14025. Changes in version 0.1.1.8-alpha - 2005-10-07
  14026. o New features (major):
  14027. - Clients don't download or use the directory anymore. Now they
  14028. download and use network-statuses from the trusted dirservers,
  14029. and fetch individual server descriptors as needed from mirrors.
  14030. See dir-spec.txt for all the gory details.
  14031. - Be more conservative about whether to advertise our DirPort.
  14032. The main change is to not advertise if we're running at capacity
  14033. and either a) we could hibernate or b) our capacity is low and
  14034. we're using a default DirPort.
  14035. - Use OpenSSL's AES when OpenSSL has version 0.9.7 or later.
  14036. o New features (minor):
  14037. - Try to be smart about when to retry network-status and
  14038. server-descriptor fetches. Still needs some tuning.
  14039. - Stop parsing, storing, or using running-routers output (but
  14040. mirrors still cache and serve it).
  14041. - Consider a threshold of versioning dirservers (dirservers who have
  14042. an opinion about which Tor versions are still recommended) before
  14043. deciding whether to warn the user that he's obsolete.
  14044. - Dirservers can now reject/invalidate by key and IP, with the
  14045. config options "AuthDirInvalid" and "AuthDirReject". This is
  14046. useful since currently we automatically list servers as running
  14047. and usable even if we know they're jerks.
  14048. - Provide dire warnings to any users who set DirServer; move it out
  14049. of torrc.sample and into torrc.complete.
  14050. - Add MyFamily to torrc.sample in the server section.
  14051. - Add nicknames to the DirServer line, so we can refer to them
  14052. without requiring all our users to memorize their IP addresses.
  14053. - When we get an EOF or a timeout on a directory connection, note
  14054. how many bytes of serverdesc we are dropping. This will help
  14055. us determine whether it is smart to parse incomplete serverdesc
  14056. responses.
  14057. - Add a new function to "change pseudonyms" -- that is, to stop
  14058. using any currently-dirty circuits for new streams, so we don't
  14059. link new actions to old actions. Currently it's only called on
  14060. HUP (or SIGNAL RELOAD).
  14061. - On sighup, if UseHelperNodes changed to 1, use new circuits.
  14062. - Start using RAND_bytes rather than RAND_pseudo_bytes from
  14063. OpenSSL. Also, reseed our entropy every hour, not just at
  14064. startup. And entropy in 512-bit chunks, not 160-bit chunks.
  14065. o Fixes on 0.1.1.7-alpha:
  14066. - Nobody ever implemented EVENT_ADDRMAP for control protocol
  14067. version 0, so don't let version 0 controllers ask for it.
  14068. - If you requested something with too many newlines via the
  14069. v1 controller protocol, you could crash tor.
  14070. - Fix a number of memory leaks, including some pretty serious ones.
  14071. - Re-enable DirPort testing again, so Tor servers will be willing
  14072. to advertise their DirPort if it's reachable.
  14073. - On TLS handshake, only check the other router's nickname against
  14074. its expected nickname if is_named is set.
  14075. o Fixes forward-ported from 0.1.0.15:
  14076. - Don't crash when we don't have any spare file descriptors and we
  14077. try to spawn a dns or cpu worker.
  14078. - Make the numbers in read-history and write-history into uint64s,
  14079. so they don't overflow and publish negatives in the descriptor.
  14080. o Fixes on 0.1.0.x:
  14081. - For the OS X package's modified privoxy config file, comment
  14082. out the "logfile" line so we don't log everything passed
  14083. through privoxy.
  14084. - We were whining about using socks4 or socks5-with-local-lookup
  14085. even when it's an IP in the "virtual" range we designed exactly
  14086. for this case.
  14087. - We were leaking some memory every time the client changes IPs.
  14088. - Never call free() on tor_malloc()d memory. This will help us
  14089. use dmalloc to detect memory leaks.
  14090. - Check for named servers when looking them up by nickname;
  14091. warn when we'recalling a non-named server by its nickname;
  14092. don't warn twice about the same name.
  14093. - Try to list MyFamily elements by key, not by nickname, and warn
  14094. if we've not heard of the server.
  14095. - Make windows platform detection (uname equivalent) smarter.
  14096. - It turns out sparc64 doesn't like unaligned access either.
  14097. Changes in version 0.1.0.15 - 2005-09-23
  14098. o Bugfixes on 0.1.0.x:
  14099. - Reject ports 465 and 587 (spam targets) in default exit policy.
  14100. - Don't crash when we don't have any spare file descriptors and we
  14101. try to spawn a dns or cpu worker.
  14102. - Get rid of IgnoreVersion undocumented config option, and make us
  14103. only warn, never exit, when we're running an obsolete version.
  14104. - Don't try to print a null string when your server finds itself to
  14105. be unreachable and the Address config option is empty.
  14106. - Make the numbers in read-history and write-history into uint64s,
  14107. so they don't overflow and publish negatives in the descriptor.
  14108. - Fix a minor memory leak in smartlist_string_remove().
  14109. - We were only allowing ourselves to upload a server descriptor at
  14110. most every 20 minutes, even if it changed earlier than that.
  14111. - Clean up log entries that pointed to old URLs.
  14112. Changes in version 0.1.1.7-alpha - 2005-09-14
  14113. o Fixes on 0.1.1.6-alpha:
  14114. - Exit servers were crashing when people asked them to make a
  14115. connection to an address not in their exit policy.
  14116. - Looking up a non-existent stream for a v1 control connection would
  14117. cause a segfault.
  14118. - Fix a seg fault if we ask a dirserver for a descriptor by
  14119. fingerprint but he doesn't know about him.
  14120. - SETCONF was appending items to linelists, not clearing them.
  14121. - SETCONF SocksBindAddress killed Tor if it fails to bind. Now back
  14122. out and refuse the setconf if it would fail.
  14123. - Downgrade the dirserver log messages when whining about
  14124. unreachability.
  14125. o New features:
  14126. - Add Peter Palfrader's check-tor script to tor/contrib/
  14127. It lets you easily check whether a given server (referenced by
  14128. nickname) is reachable by you.
  14129. - Numerous changes to move towards client-side v2 directories. Not
  14130. enabled yet.
  14131. o Fixes on 0.1.0.x:
  14132. - If the user gave tor an odd number of command-line arguments,
  14133. we were silently ignoring the last one. Now we complain and fail.
  14134. [This wins the oldest-bug prize -- this bug has been present since
  14135. November 2002, as released in Tor 0.0.0.]
  14136. - Do not use unaligned memory access on alpha, mips, or mipsel.
  14137. It *works*, but is very slow, so we treat them as if it doesn't.
  14138. - Retry directory requests if we fail to get an answer we like
  14139. from a given dirserver (we were retrying before, but only if
  14140. we fail to connect).
  14141. - When writing the RecommendedVersions line, sort them first.
  14142. - When the client asked for a rendezvous port that the hidden
  14143. service didn't want to provide, we were sending an IP address
  14144. back along with the end cell. Fortunately, it was zero. But stop
  14145. that anyway.
  14146. - Correct "your server is reachable" log entries to indicate that
  14147. it was self-testing that told us so.
  14148. Changes in version 0.1.1.6-alpha - 2005-09-09
  14149. o Fixes on 0.1.1.5-alpha:
  14150. - We broke fascistfirewall in 0.1.1.5-alpha. Oops.
  14151. - Fix segfault in unit tests in 0.1.1.5-alpha. Oops.
  14152. - Fix bug with tor_memmem finding a match at the end of the string.
  14153. - Make unit tests run without segfaulting.
  14154. - Resolve some solaris x86 compile warnings.
  14155. - Handle duplicate lines in approved-routers files without warning.
  14156. - Fix bug where as soon as a server refused any requests due to his
  14157. exit policy (e.g. when we ask for localhost and he tells us that's
  14158. 127.0.0.1 and he won't do it), we decided he wasn't obeying his
  14159. exit policy using him for any exits.
  14160. - Only do openssl hardware accelerator stuff if openssl version is
  14161. at least 0.9.7.
  14162. o New controller features/fixes:
  14163. - Add a "RESETCONF" command so you can set config options like
  14164. AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
  14165. a config option in the torrc with no value, then it clears it
  14166. entirely (rather than setting it to its default).
  14167. - Add a "GETINFO config-file" to tell us where torrc is.
  14168. - Avoid sending blank lines when GETINFO replies should be empty.
  14169. - Add a QUIT command for the controller (for using it manually).
  14170. - Fix a bug in SAVECONF that was adding default dirservers and
  14171. other redundant entries to the torrc file.
  14172. o Start on the new directory design:
  14173. - Generate, publish, cache, serve new network-status format.
  14174. - Publish individual descriptors (by fingerprint, by "all", and by
  14175. "tell me yours").
  14176. - Publish client and server recommended versions separately.
  14177. - Allow tor_gzip_uncompress() to handle multiple concatenated
  14178. compressed strings. Serve compressed groups of router
  14179. descriptors. The compression logic here could be more
  14180. memory-efficient.
  14181. - Distinguish v1 authorities (all currently trusted directories)
  14182. from v2 authorities (all trusted directories).
  14183. - Change DirServers config line to note which dirs are v1 authorities.
  14184. - Add configuration option "V1AuthoritativeDirectory 1" which
  14185. moria1, moria2, and tor26 should set.
  14186. - Remove option when getting directory cache to see whether they
  14187. support running-routers; they all do now. Replace it with one
  14188. to see whether caches support v2 stuff.
  14189. o New features:
  14190. - Dirservers now do their own external reachability testing of each
  14191. Tor server, and only list them as running if they've been found to
  14192. be reachable. We also send back warnings to the server's logs if
  14193. it uploads a descriptor that we already believe is unreachable.
  14194. - Implement exit enclaves: if we know an IP address for the
  14195. destination, and there's a running Tor server at that address
  14196. which allows exit to the destination, then extend the circuit to
  14197. that exit first. This provides end-to-end encryption and end-to-end
  14198. authentication. Also, if the user wants a .exit address or enclave,
  14199. use 4 hops rather than 3, and cannibalize a general circ for it
  14200. if you can.
  14201. - Permit transitioning from ORPort=0 to ORPort!=0, and back, from the
  14202. controller. Also, rotate dns and cpu workers if the controller
  14203. changes options that will affect them; and initialize the dns
  14204. worker cache tree whether or not we start out as a server.
  14205. - Only upload a new server descriptor when options change, 18
  14206. hours have passed, uptime is reset, or bandwidth changes a lot.
  14207. - Check [X-]Forwarded-For headers in HTTP requests when generating
  14208. log messages. This lets people run dirservers (and caches) behind
  14209. Apache but still know which IP addresses are causing warnings.
  14210. o Config option changes:
  14211. - Replace (Fascist)Firewall* config options with a new
  14212. ReachableAddresses option that understands address policies.
  14213. For example, "ReachableAddresses *:80,*:443"
  14214. - Get rid of IgnoreVersion undocumented config option, and make us
  14215. only warn, never exit, when we're running an obsolete version.
  14216. - Make MonthlyAccountingStart config option truly obsolete now.
  14217. o Fixes on 0.1.0.x:
  14218. - Reject ports 465 and 587 in the default exit policy, since
  14219. people have started using them for spam too.
  14220. - It turns out we couldn't bootstrap a network since we added
  14221. reachability detection in 0.1.0.1-rc. Good thing the Tor network
  14222. has never gone down. Add an AssumeReachable config option to let
  14223. servers and dirservers bootstrap. When we're trying to build a
  14224. high-uptime or high-bandwidth circuit but there aren't enough
  14225. suitable servers, try being less picky rather than simply failing.
  14226. - Our logic to decide if the OR we connected to was the right guy
  14227. was brittle and maybe open to a mitm for unverified routers.
  14228. - We weren't cannibalizing circuits correctly for
  14229. CIRCUIT_PURPOSE_C_ESTABLISH_REND and
  14230. CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
  14231. build those from scratch. This should make hidden services faster.
  14232. - Predict required circuits better, with an eye toward making hidden
  14233. services faster on the service end.
  14234. - Retry streams if the exit node sends back a 'misc' failure. This
  14235. should result in fewer random failures. Also, after failing
  14236. from resolve failed or misc, reset the num failures, so we give
  14237. it a fair shake next time we try.
  14238. - Clean up the rendezvous warn log msgs, and downgrade some to info.
  14239. - Reduce severity on logs about dns worker spawning and culling.
  14240. - When we're shutting down and we do something like try to post a
  14241. server descriptor or rendezvous descriptor, don't complain that
  14242. we seem to be unreachable. Of course we are, we're shutting down.
  14243. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
  14244. We don't use them yet, but maybe one day our DNS resolver will be
  14245. able to discover them.
  14246. - Make ContactInfo mandatory for authoritative directory servers.
  14247. - Require server descriptors to list IPv4 addresses -- hostnames
  14248. are no longer allowed. This also fixes some potential security
  14249. problems with people providing hostnames as their address and then
  14250. preferentially resolving them to partition users.
  14251. - Change log line for unreachability to explicitly suggest /etc/hosts
  14252. as the culprit. Also make it clearer what IP address and ports we're
  14253. testing for reachability.
  14254. - Put quotes around user-supplied strings when logging so users are
  14255. more likely to realize if they add bad characters (like quotes)
  14256. to the torrc.
  14257. - Let auth dir servers start without specifying an Address config
  14258. option.
  14259. - Make unit tests (and other invocations that aren't the real Tor)
  14260. run without launching listeners, creating subdirectories, and so on.
  14261. Changes in version 0.1.1.5-alpha - 2005-08-08
  14262. o Bugfixes included in 0.1.0.14.
  14263. o Bugfixes on 0.1.0.x:
  14264. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
  14265. torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
  14266. it would silently using ignore the 6668.
  14267. Changes in version 0.1.0.14 - 2005-08-08
  14268. o Bugfixes on 0.1.0.x:
  14269. - Fix the other half of the bug with crypto handshakes
  14270. (CVE-2005-2643).
  14271. - Fix an assert trigger if you send a 'signal term' via the
  14272. controller when it's listening for 'event info' messages.
  14273. Changes in version 0.1.1.4-alpha - 2005-08-04
  14274. o Bugfixes included in 0.1.0.13.
  14275. o Features:
  14276. - Improve tor_gettimeofday() granularity on windows.
  14277. - Make clients regenerate their keys when their IP address changes.
  14278. - Implement some more GETINFO goodness: expose helper nodes, config
  14279. options, getinfo keys.
  14280. Changes in version 0.1.0.13 - 2005-08-04
  14281. o Bugfixes on 0.1.0.x:
  14282. - Fix a critical bug in the security of our crypto handshakes.
  14283. - Fix a size_t underflow in smartlist_join_strings2() that made
  14284. it do bad things when you hand it an empty smartlist.
  14285. - Fix Windows installer to ship Tor license (thanks to Aphex for
  14286. pointing out this oversight) and put a link to the doc directory
  14287. in the start menu.
  14288. - Explicitly set no-unaligned-access for sparc: it turns out the
  14289. new gcc's let you compile broken code, but that doesn't make it
  14290. not-broken.
  14291. Changes in version 0.1.1.3-alpha - 2005-07-23
  14292. o Bugfixes on 0.1.1.2-alpha:
  14293. - Fix a bug in handling the controller's "post descriptor"
  14294. function.
  14295. - Fix several bugs in handling the controller's "extend circuit"
  14296. function.
  14297. - Fix a bug in handling the controller's "stream status" event.
  14298. - Fix an assert failure if we have a controller listening for
  14299. circuit events and we go offline.
  14300. - Re-allow hidden service descriptors to publish 0 intro points.
  14301. - Fix a crash when generating your hidden service descriptor if
  14302. you don't have enough intro points already.
  14303. o New features on 0.1.1.2-alpha:
  14304. - New controller function "getinfo accounting", to ask how
  14305. many bytes we've used in this time period.
  14306. - Experimental support for helper nodes: a lot of the risk from
  14307. a small static adversary comes because users pick new random
  14308. nodes every time they rebuild a circuit. Now users will try to
  14309. stick to the same small set of entry nodes if they can. Not
  14310. enabled by default yet.
  14311. o Bugfixes on 0.1.0.12:
  14312. - If you're an auth dir server, always publish your dirport,
  14313. even if you haven't yet found yourself to be reachable.
  14314. - Fix a size_t underflow in smartlist_join_strings2() that made
  14315. it do bad things when you hand it an empty smartlist.
  14316. Changes in version 0.1.0.12 - 2005-07-18
  14317. o New directory servers:
  14318. - tor26 has changed IP address.
  14319. o Bugfixes on 0.1.0.x:
  14320. - Fix a possible double-free in tor_gzip_uncompress().
  14321. - When --disable-threads is set, do not search for or link against
  14322. pthreads libraries.
  14323. - Don't trigger an assert if an authoritative directory server
  14324. claims its dirport is 0.
  14325. - Fix bug with removing Tor as an NT service: some people were
  14326. getting "The service did not return an error." Thanks to Matt
  14327. Edman for the fix.
  14328. Changes in version 0.1.1.2-alpha - 2005-07-15
  14329. o New directory servers:
  14330. - tor26 has changed IP address.
  14331. o Bugfixes on 0.1.0.x, crashes/leaks:
  14332. - Port the servers-not-obeying-their-exit-policies fix from
  14333. 0.1.0.11.
  14334. - Fix an fd leak in start_daemon().
  14335. - On Windows, you can't always reopen a port right after you've
  14336. closed it. So change retry_listeners() to only close and re-open
  14337. ports that have changed.
  14338. - Fix a possible double-free in tor_gzip_uncompress().
  14339. o Bugfixes on 0.1.0.x, usability:
  14340. - When tor_socketpair() fails in Windows, give a reasonable
  14341. Windows-style errno back.
  14342. - Let people type "tor --install" as well as "tor -install" when
  14343. they
  14344. want to make it an NT service.
  14345. - NT service patch from Matt Edman to improve error messages.
  14346. - When the controller asks for a config option with an abbreviated
  14347. name, give the full name in our response.
  14348. - Correct the man page entry on TrackHostExitsExpire.
  14349. - Looks like we were never delivering deflated (i.e. compressed)
  14350. running-routers lists, even when asked. Oops.
  14351. - When --disable-threads is set, do not search for or link against
  14352. pthreads libraries.
  14353. o Bugfixes on 0.1.1.x:
  14354. - Fix a seg fault with autodetecting which controller version is
  14355. being used.
  14356. o Features:
  14357. - New hidden service descriptor format: put a version in it, and
  14358. let people specify introduction/rendezvous points that aren't
  14359. in "the directory" (which is subjective anyway).
  14360. - Allow the DEBUG controller event to work again. Mark certain log
  14361. entries as "don't tell this to controllers", so we avoid cycles.
  14362. Changes in version 0.1.0.11 - 2005-06-30
  14363. o Bugfixes on 0.1.0.x:
  14364. - Fix major security bug: servers were disregarding their
  14365. exit policies if clients behaved unexpectedly.
  14366. - Make OS X init script check for missing argument, so we don't
  14367. confuse users who invoke it incorrectly.
  14368. - Fix a seg fault in "tor --hash-password foo".
  14369. - The MAPADDRESS control command was broken.
  14370. Changes in version 0.1.1.1-alpha - 2005-06-29
  14371. o Bugfixes:
  14372. - Make OS X init script check for missing argument, so we don't
  14373. confuse users who invoke it incorrectly.
  14374. - Fix a seg fault in "tor --hash-password foo".
  14375. - Fix a possible way to DoS dirservers.
  14376. - When we complain that your exit policy implicitly allows local or
  14377. private address spaces, name them explicitly so operators can
  14378. fix it.
  14379. - Make the log message less scary when all the dirservers are
  14380. temporarily unreachable.
  14381. - We were printing the number of idle dns workers incorrectly when
  14382. culling them.
  14383. o Features:
  14384. - Revised controller protocol (version 1) that uses ascii rather
  14385. than binary. Add supporting libraries in python and java so you
  14386. can use the controller from your applications without caring how
  14387. our protocol works.
  14388. - Spiffy new support for crypto hardware accelerators. Can somebody
  14389. test this?
  14390. Changes in version 0.0.9.10 - 2005-06-16
  14391. o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
  14392. - Refuse relay cells that claim to have a length larger than the
  14393. maximum allowed. This prevents a potential attack that could read
  14394. arbitrary memory (e.g. keys) from an exit server's process
  14395. (CVE-2005-2050).
  14396. Changes in version 0.1.0.10 - 2005-06-14
  14397. o Allow a few EINVALs from libevent before dying. Warn on kqueue with
  14398. libevent before 1.1a.
  14399. Changes in version 0.1.0.9-rc - 2005-06-09
  14400. o Bugfixes:
  14401. - Reset buf->highwater every time buf_shrink() is called, not just on
  14402. a successful shrink. This was causing significant memory bloat.
  14403. - Fix buffer overflow when checking hashed passwords.
  14404. - Security fix: if seeding the RNG on Win32 fails, quit.
  14405. - Allow seeding the RNG on Win32 even when you're not running as
  14406. Administrator.
  14407. - Disable threading on Solaris too. Something is wonky with it,
  14408. cpuworkers, and reentrant libs.
  14409. - Reenable the part of the code that tries to flush as soon as an
  14410. OR outbuf has a full TLS record available. Perhaps this will make
  14411. OR outbufs not grow as huge except in rare cases, thus saving lots
  14412. of CPU time plus memory.
  14413. - Reject malformed .onion addresses rather then passing them on as
  14414. normal web requests.
  14415. - Adapt patch from Adam Langley: fix possible memory leak in
  14416. tor_lookup_hostname().
  14417. - Initialize libevent later in the startup process, so the logs are
  14418. already established by the time we start logging libevent warns.
  14419. - Use correct errno on win32 if libevent fails.
  14420. - Check and warn about known-bad/slow libevent versions.
  14421. - Pay more attention to the ClientOnly config option.
  14422. - Have torctl.in/tor.sh.in check for location of su binary (needed
  14423. on FreeBSD)
  14424. - Correct/add man page entries for LongLivedPorts, ExitPolicy,
  14425. KeepalivePeriod, ClientOnly, NoPublish, HttpProxy, HttpsProxy,
  14426. HttpProxyAuthenticator
  14427. - Stop warning about sigpipes in the logs. We're going to
  14428. pretend that getting these occassionally is normal and fine.
  14429. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in
  14430. certain
  14431. installer screens; and don't put stuff into StartupItems unless
  14432. the user asks you to.
  14433. - Require servers that use the default dirservers to have public IP
  14434. addresses. We have too many servers that are configured with private
  14435. IPs and their admins never notice the log entries complaining that
  14436. their descriptors are being rejected.
  14437. - Add OSX uninstall instructions. An actual uninstall script will
  14438. come later.
  14439. Changes in version 0.1.0.8-rc - 2005-05-23
  14440. o Bugfixes:
  14441. - It turns out that kqueue on OS X 10.3.9 was causing kernel
  14442. panics. Disable kqueue on all OS X Tors.
  14443. - Fix RPM: remove duplicate line accidentally added to the rpm
  14444. spec file.
  14445. - Disable threads on openbsd too, since its gethostaddr is not
  14446. reentrant either.
  14447. - Tolerate libevent 0.8 since it still works, even though it's
  14448. ancient.
  14449. - Enable building on Red Hat 9.0 again.
  14450. - Allow the middle hop of the testing circuit to be running any
  14451. version, now that most of them have the bugfix to let them connect
  14452. to unknown servers. This will allow reachability testing to work
  14453. even when 0.0.9.7-0.0.9.9 become obsolete.
  14454. - Handle relay cells with rh.length too large. This prevents
  14455. a potential attack that could read arbitrary memory (maybe even
  14456. keys) from the exit server's process.
  14457. - We screwed up the dirport reachability testing when we don't yet
  14458. have a cached version of the directory. Hopefully now fixed.
  14459. - Clean up router_load_single_router() (used by the controller),
  14460. so it doesn't seg fault on error.
  14461. - Fix a minor memory leak when somebody establishes an introduction
  14462. point at your Tor server.
  14463. - If a socks connection ends because read fails, don't warn that
  14464. you're not sending a socks reply back.
  14465. o Features:
  14466. - Add HttpProxyAuthenticator config option too, that works like
  14467. the HttpsProxyAuthenticator config option.
  14468. - Encode hashed controller passwords in hex instead of base64,
  14469. to make it easier to write controllers.
  14470. Changes in version 0.1.0.7-rc - 2005-05-17
  14471. o Bugfixes:
  14472. - Fix a bug in the OS X package installer that prevented it from
  14473. installing on Tiger.
  14474. - Fix a script bug in the OS X package installer that made it
  14475. complain during installation.
  14476. - Find libevent even if it's hiding in /usr/local/ and your
  14477. CFLAGS and LDFLAGS don't tell you to look there.
  14478. - Be able to link with libevent as a shared library (the default
  14479. after 1.0d), even if it's hiding in /usr/local/lib and even
  14480. if you haven't added /usr/local/lib to your /etc/ld.so.conf,
  14481. assuming you're running gcc. Otherwise fail and give a useful
  14482. error message.
  14483. - Fix a bug in the RPM packager: set home directory for _tor to
  14484. something more reasonable when first installing.
  14485. - Free a minor amount of memory that is still reachable on exit.
  14486. Changes in version 0.1.0.6-rc - 2005-05-14
  14487. o Bugfixes:
  14488. - Implement --disable-threads configure option. Disable threads on
  14489. netbsd by default, because it appears to have no reentrant resolver
  14490. functions.
  14491. - Apple's OS X 10.4.0 ships with a broken kqueue. The new libevent
  14492. release (1.1) detects and disables kqueue if it's broken.
  14493. - Append default exit policy before checking for implicit internal
  14494. addresses. Now we don't log a bunch of complaints on startup
  14495. when using the default exit policy.
  14496. - Some people were putting "Address " in their torrc, and they had
  14497. a buggy resolver that resolved " " to 0.0.0.0. Oops.
  14498. - If DataDir is ~/.tor, and that expands to /.tor, then default to
  14499. LOCALSTATEDIR/tor instead.
  14500. - Fix fragmented-message bug in TorControl.py.
  14501. - Resolve a minor bug which would prevent unreachable dirports
  14502. from getting suppressed in the published descriptor.
  14503. - When the controller gave us a new descriptor, we weren't resolving
  14504. it immediately, so Tor would think its address was 0.0.0.0 until
  14505. we fetched a new directory.
  14506. - Fix an uppercase/lowercase case error in suppressing a bogus
  14507. libevent warning on some Linuxes.
  14508. o Features:
  14509. - Begin scrubbing sensitive strings from logs by default. Turn off
  14510. the config option SafeLogging if you need to do debugging.
  14511. - Switch to a new buffer management algorithm, which tries to avoid
  14512. reallocing and copying quite as much. In first tests it looks like
  14513. it uses *more* memory on average, but less cpu.
  14514. - First cut at support for "create-fast" cells. Clients can use
  14515. these when extending to their first hop, since the TLS already
  14516. provides forward secrecy and authentication. Not enabled on
  14517. clients yet.
  14518. - When dirservers refuse a router descriptor, we now log its
  14519. contactinfo, platform, and the poster's IP address.
  14520. - Call tor_free_all instead of connections_free_all after forking, to
  14521. save memory on systems that need to fork.
  14522. - Whine at you if you're a server and you don't set your contactinfo.
  14523. - Implement --verify-config command-line option to check if your torrc
  14524. is valid without actually launching Tor.
  14525. - Rewrite address "serifos.exit" to "localhost.serifos.exit"
  14526. rather than just rejecting it.
  14527. Changes in version 0.1.0.5-rc - 2005-04-27
  14528. o Bugfixes:
  14529. - Stop trying to print a null pointer if an OR conn fails because
  14530. we didn't like its cert.
  14531. o Features:
  14532. - Switch our internal buffers implementation to use a ring buffer,
  14533. to hopefully improve performance for fast servers a lot.
  14534. - Add HttpsProxyAuthenticator support (basic auth only), based
  14535. on patch from Adam Langley.
  14536. - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
  14537. the fast servers that have been joining lately.
  14538. - Give hidden service accesses extra time on the first attempt,
  14539. since 60 seconds is often only barely enough. This might improve
  14540. robustness more.
  14541. - Improve performance for dirservers: stop re-parsing the whole
  14542. directory every time you regenerate it.
  14543. - Add more debugging info to help us find the weird dns freebsd
  14544. pthreads bug; cleaner debug messages to help track future issues.
  14545. Changes in version 0.0.9.9 - 2005-04-23
  14546. o Bugfixes on 0.0.9.x:
  14547. - If unofficial Tor clients connect and send weird TLS certs, our
  14548. Tor server triggers an assert. This release contains a minimal
  14549. backport from the broader fix that we put into 0.1.0.4-rc.
  14550. Changes in version 0.1.0.4-rc - 2005-04-23
  14551. o Bugfixes:
  14552. - If unofficial Tor clients connect and send weird TLS certs, our
  14553. Tor server triggers an assert. Stop asserting, and start handling
  14554. TLS errors better in other situations too.
  14555. - When the controller asks us to tell it about all the debug-level
  14556. logs, it turns out we were generating debug-level logs while
  14557. telling it about them, which turns into a bad loop. Now keep
  14558. track of whether you're sending a debug log to the controller,
  14559. and don't log when you are.
  14560. - Fix the "postdescriptor" feature of the controller interface: on
  14561. non-complete success, only say "done" once.
  14562. o Features:
  14563. - Clients are now willing to load balance over up to 2mB, not 1mB,
  14564. of advertised bandwidth capacity.
  14565. - Add a NoPublish config option, so you can be a server (e.g. for
  14566. testing running Tor servers in other Tor networks) without
  14567. publishing your descriptor to the primary dirservers.
  14568. Changes in version 0.1.0.3-rc - 2005-04-08
  14569. o Improvements on 0.1.0.2-rc:
  14570. - Client now retries when streams end early for 'hibernating' or
  14571. 'resource limit' reasons, rather than failing them.
  14572. - More automated handling for dirserver operators:
  14573. - Automatically approve nodes running 0.1.0.2-rc or later,
  14574. now that the the reachability detection stuff is working.
  14575. - Now we allow two unverified servers with the same nickname
  14576. but different keys. But if a nickname is verified, only that
  14577. nickname+key are allowed.
  14578. - If you're an authdirserver connecting to an address:port,
  14579. and it's not the OR you were expecting, forget about that
  14580. descriptor. If he *was* the one you were expecting, then forget
  14581. about all other descriptors for that address:port.
  14582. - Allow servers to publish descriptors from 12 hours in the future.
  14583. Corollary: only whine about clock skew from the dirserver if
  14584. he's a trusted dirserver (since now even verified servers could
  14585. have quite wrong clocks).
  14586. - Adjust maximum skew and age for rendezvous descriptors: let skew
  14587. be 48 hours rather than 90 minutes.
  14588. - Efficiency improvements:
  14589. - Keep a big splay tree of (circid,orconn)->circuit mappings to make
  14590. it much faster to look up a circuit for each relay cell.
  14591. - Remove most calls to assert_all_pending_dns_resolves_ok(),
  14592. since they're eating our cpu on exit nodes.
  14593. - Stop wasting time doing a case insensitive comparison for every
  14594. dns name every time we do any lookup. Canonicalize the names to
  14595. lowercase and be done with it.
  14596. - Start sending 'truncated' cells back rather than destroy cells,
  14597. if the circuit closes in front of you. This means we won't have
  14598. to abandon partially built circuits.
  14599. - Only warn once per nickname from add_nickname_list_to_smartlist
  14600. per failure, so an entrynode or exitnode choice that's down won't
  14601. yell so much.
  14602. - Put a note in the torrc about abuse potential with the default
  14603. exit policy.
  14604. - Revise control spec and implementation to allow all log messages to
  14605. be sent to controller with their severities intact (suggested by
  14606. Matt Edman). Update TorControl to handle new log event types.
  14607. - Provide better explanation messages when controller's POSTDESCRIPTOR
  14608. fails.
  14609. - Stop putting nodename in the Platform string in server descriptors.
  14610. It doesn't actually help, and it is confusing/upsetting some people.
  14611. o Bugfixes on 0.1.0.2-rc:
  14612. - We were printing the host mask wrong in exit policies in server
  14613. descriptors. This isn't a critical bug though, since we were still
  14614. obeying the exit policy internally.
  14615. - Fix Tor when compiled with libevent but without pthreads: move
  14616. connection_unregister() from _connection_free() to
  14617. connection_free().
  14618. - Fix an assert trigger (already fixed in 0.0.9.x): when we have
  14619. the rare mysterious case of accepting a conn on 0.0.0.0:0, then
  14620. when we look through the connection array, we'll find any of the
  14621. cpu/dnsworkers. This is no good.
  14622. o Bugfixes on 0.0.9.8:
  14623. - Fix possible bug on threading platforms (e.g. win32) which was
  14624. leaking a file descriptor whenever a cpuworker or dnsworker died.
  14625. - When using preferred entry or exit nodes, ignore whether the
  14626. circuit wants uptime or capacity. They asked for the nodes, they
  14627. get the nodes.
  14628. - chdir() to your datadirectory at the *end* of the daemonize process,
  14629. not the beginning. This was a problem because the first time you
  14630. run tor, if your datadir isn't there, and you have runasdaemon set
  14631. to 1, it will try to chdir to it before it tries to create it. Oops.
  14632. - Handle changed router status correctly when dirserver reloads
  14633. fingerprint file. We used to be dropping all unverified descriptors
  14634. right then. The bug was hidden because we would immediately
  14635. fetch a directory from another dirserver, which would include the
  14636. descriptors we just dropped.
  14637. - When we're connecting to an OR and he's got a different nickname/key
  14638. than we were expecting, only complain loudly if we're an OP or a
  14639. dirserver. Complaining loudly to the OR admins just confuses them.
  14640. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
  14641. artificially capped at 500kB.
  14642. Changes in version 0.0.9.8 - 2005-04-07
  14643. o Bugfixes on 0.0.9.x:
  14644. - We have a bug that I haven't found yet. Sometimes, very rarely,
  14645. cpuworkers get stuck in the 'busy' state, even though the cpuworker
  14646. thinks of itself as idle. This meant that no new circuits ever got
  14647. established. Here's a workaround to kill any cpuworker that's been
  14648. busy for more than 100 seconds.
  14649. Changes in version 0.1.0.2-rc - 2005-04-01
  14650. o Bugfixes on 0.1.0.1-rc:
  14651. - Fixes on reachability detection:
  14652. - Don't check for reachability while hibernating.
  14653. - If ORPort is reachable but DirPort isn't, still publish the
  14654. descriptor, but zero out DirPort until it's found reachable.
  14655. - When building testing circs for ORPort testing, use only
  14656. high-bandwidth nodes, so fewer circuits fail.
  14657. - Complain about unreachable ORPort separately from unreachable
  14658. DirPort, so the user knows what's going on.
  14659. - Make sure we only conclude ORPort reachability if we didn't
  14660. initiate the conn. Otherwise we could falsely conclude that
  14661. we're reachable just because we connected to the guy earlier
  14662. and he used that same pipe to extend to us.
  14663. - Authdirservers shouldn't do ORPort reachability detection,
  14664. since they're in clique mode, so it will be rare to find a
  14665. server not already connected to them.
  14666. - When building testing circuits, always pick middle hops running
  14667. Tor 0.0.9.7, so we avoid the "can't extend to unknown routers"
  14668. bug. (This is a kludge; it will go away when 0.0.9.x becomes
  14669. obsolete.)
  14670. - When we decide we're reachable, actually publish our descriptor
  14671. right then.
  14672. - Fix bug in redirectstream in the controller.
  14673. - Fix the state descriptor strings so logs don't claim edge streams
  14674. are in a different state than they actually are.
  14675. - Use recent libevent features when possible (this only really affects
  14676. win32 and osx right now, because the new libevent with these
  14677. features hasn't been released yet). Add code to suppress spurious
  14678. libevent log msgs.
  14679. - Prevent possible segfault in connection_close_unattached_ap().
  14680. - Fix newlines on torrc in win32.
  14681. - Improve error msgs when tor-resolve fails.
  14682. o Improvements on 0.0.9.x:
  14683. - New experimental script tor/contrib/ExerciseServer.py (needs more
  14684. work) that uses the controller interface to build circuits and
  14685. fetch pages over them. This will help us bootstrap servers that
  14686. have lots of capacity but haven't noticed it yet.
  14687. - New experimental script tor/contrib/PathDemo.py (needs more work)
  14688. that uses the controller interface to let you choose whole paths
  14689. via addresses like
  14690. "<hostname>.<path,separated by dots>.<length of path>.path"
  14691. - When we've connected to an OR and handshaked but didn't like
  14692. the result, we were closing the conn without sending destroy
  14693. cells back for pending circuits. Now send those destroys.
  14694. Changes in version 0.0.9.7 - 2005-04-01
  14695. o Bugfixes on 0.0.9.x:
  14696. - Fix another race crash bug (thanks to Glenn Fink for reporting).
  14697. - Compare identity to identity, not to nickname, when extending to
  14698. a router not already in the directory. This was preventing us from
  14699. extending to unknown routers. Oops.
  14700. - Make sure to create OS X Tor user in <500 range, so we aren't
  14701. creating actual system users.
  14702. - Note where connection-that-hasn't-sent-end was marked, and fix
  14703. a few really loud instances of this harmless bug (it's fixed more
  14704. in 0.1.0.x).
  14705. Changes in version 0.1.0.1-rc - 2005-03-28
  14706. o New features:
  14707. - Add reachability testing. Your Tor server will automatically try
  14708. to see if its ORPort and DirPort are reachable from the outside,
  14709. and it won't upload its descriptor until it decides they are.
  14710. - Handle unavailable hidden services better. Handle slow or busy
  14711. hidden services better.
  14712. - Add support for CONNECTing through https proxies, with "HttpsProxy"
  14713. config option.
  14714. - New exit policy: accept most low-numbered ports, rather than
  14715. rejecting most low-numbered ports.
  14716. - More Tor controller support (still experimental). See
  14717. http://tor.eff.org/doc/control-spec.txt for all the new features,
  14718. including signals to emulate unix signals from any platform;
  14719. redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
  14720. closestream; closecircuit; etc.
  14721. - Make nt services work and start on startup on win32 (based on
  14722. patch by Matt Edman).
  14723. - Add a new AddressMap config directive to rewrite incoming socks
  14724. addresses. This lets you, for example, declare an implicit
  14725. required exit node for certain sites.
  14726. - Add a new TrackHostExits config directive to trigger addressmaps
  14727. for certain incoming socks addresses -- for sites that break when
  14728. your exit keeps changing (based on patch by Mike Perry).
  14729. - Redo the client-side dns cache so it's just an addressmap too.
  14730. - Notice when our IP changes, and reset stats/uptime/reachability.
  14731. - When an application is using socks5, give him the whole variety of
  14732. potential socks5 responses (connect refused, host unreachable, etc),
  14733. rather than just "success" or "failure".
  14734. - A more sane version numbering system. See
  14735. http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
  14736. - New contributed script "exitlist": a simple python script to
  14737. parse directories and find Tor nodes that exit to listed
  14738. addresses/ports.
  14739. - New contributed script "privoxy-tor-toggle" to toggle whether
  14740. Privoxy uses Tor. Seems to be configured for Debian by default.
  14741. - Report HTTP reasons to client when getting a response from directory
  14742. servers -- so you can actually know what went wrong.
  14743. - New config option MaxAdvertisedBandwidth which lets you advertise
  14744. a low bandwidthrate (to not attract as many circuits) while still
  14745. allowing a higher bandwidthrate in reality.
  14746. o Robustness/stability fixes:
  14747. - Make Tor use Niels Provos's libevent instead of its current
  14748. poll-but-sometimes-select mess. This will let us use faster async
  14749. cores (like epoll, kpoll, and /dev/poll), and hopefully work better
  14750. on Windows too.
  14751. - pthread support now too. This was forced because when we forked,
  14752. we ended up wasting a lot of duplicate ram over time. Also switch
  14753. to foo_r versions of some library calls to allow reentry and
  14754. threadsafeness.
  14755. - Better handling for heterogeneous / unreliable nodes:
  14756. - Annotate circuits w/ whether they aim to contain high uptime nodes
  14757. and/or high capacity nodes. When building circuits, choose
  14758. appropriate nodes.
  14759. - This means that every single node in an intro rend circuit,
  14760. not just the last one, will have a minimum uptime.
  14761. - New config option LongLivedPorts to indicate application streams
  14762. that will want high uptime circuits.
  14763. - Servers reset uptime when a dir fetch entirely fails. This
  14764. hopefully reflects stability of the server's network connectivity.
  14765. - If somebody starts his tor server in Jan 2004 and then fixes his
  14766. clock, don't make his published uptime be a year.
  14767. - Reset published uptime when you wake up from hibernation.
  14768. - Introduce a notion of 'internal' circs, which are chosen without
  14769. regard to the exit policy of the last hop. Intro and rendezvous
  14770. circs must be internal circs, to avoid leaking information. Resolve
  14771. and connect streams can use internal circs if they want.
  14772. - New circuit pooling algorithm: make sure to have enough circs around
  14773. to satisfy any predicted ports, and also make sure to have 2 internal
  14774. circs around if we've required internal circs lately (and with high
  14775. uptime if we've seen that lately too).
  14776. - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
  14777. which describes how often we retry making new circuits if current
  14778. ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
  14779. how long we're willing to make use of an already-dirty circuit.
  14780. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
  14781. circ as necessary, if there are any completed ones lying around
  14782. when we try to launch one.
  14783. - Make hidden services try to establish a rendezvous for 30 seconds,
  14784. rather than for n (where n=3) attempts to build a circuit.
  14785. - Change SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to a config option
  14786. "ShutdownWaitLength".
  14787. - Try to be more zealous about calling connection_edge_end when
  14788. things go bad with edge conns in connection.c.
  14789. - Revise tor-spec to add more/better stream end reasons.
  14790. - Revise all calls to connection_edge_end to avoid sending "misc",
  14791. and to take errno into account where possible.
  14792. o Bug fixes:
  14793. - Fix a race condition that can trigger an assert, when we have a
  14794. pending create cell and an OR connection fails right then.
  14795. - Fix several double-mark-for-close bugs, e.g. where we were finding
  14796. a conn for a cell even if that conn is already marked for close.
  14797. - Make sequence of log messages when starting on win32 with no config
  14798. file more reasonable.
  14799. - When choosing an exit node for a new non-internal circ, don't take
  14800. into account whether it'll be useful for any pending x.onion
  14801. addresses -- it won't.
  14802. - Turn addr_policy_compare from a tristate to a quadstate; this should
  14803. help address our "Ah, you allow 1.2.3.4:80. You are a good choice
  14804. for google.com" problem.
  14805. - Make "platform" string in descriptor more accurate for Win32 servers,
  14806. so it's not just "unknown platform".
  14807. - Fix an edge case in parsing config options (thanks weasel).
  14808. If they say "--" on the commandline, it's not an option.
  14809. - Reject odd-looking addresses at the client (e.g. addresses that
  14810. contain a colon), rather than having the server drop them because
  14811. they're malformed.
  14812. - tor-resolve requests were ignoring .exit if there was a working circuit
  14813. they could use instead.
  14814. - REUSEADDR on normal platforms means you can rebind to the port
  14815. right after somebody else has let it go. But REUSEADDR on win32
  14816. means to let you bind to the port _even when somebody else
  14817. already has it bound_! So, don't do that on Win32.
  14818. - Change version parsing logic: a version is "obsolete" if it is not
  14819. recommended and (1) there is a newer recommended version in the
  14820. same series, or (2) there are no recommended versions in the same
  14821. series, but there are some recommended versions in a newer series.
  14822. A version is "new" if it is newer than any recommended version in
  14823. the same series.
  14824. - Stop most cases of hanging up on a socks connection without sending
  14825. the socks reject.
  14826. o Helpful fixes:
  14827. - Require BandwidthRate to be at least 20kB/s for servers.
  14828. - When a dirserver causes you to give a warn, mention which dirserver
  14829. it was.
  14830. - New config option DirAllowPrivateAddresses for authdirservers.
  14831. Now by default they refuse router descriptors that have non-IP or
  14832. private-IP addresses.
  14833. - Stop publishing socksport in the directory, since it's not
  14834. actually meant to be public. For compatibility, publish a 0 there
  14835. for now.
  14836. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
  14837. smart" value, that is low for servers and high for clients.
  14838. - If our clock jumps forward by 100 seconds or more, assume something
  14839. has gone wrong with our network and abandon all not-yet-used circs.
  14840. - Warn when exit policy implicitly allows local addresses.
  14841. - If we get an incredibly skewed timestamp from a dirserver mirror
  14842. that isn't a verified OR, don't warn -- it's probably him that's
  14843. wrong.
  14844. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
  14845. cookies to disk and doesn't log each web request to disk. (Thanks
  14846. to Brett Carrington for pointing this out.)
  14847. - When a client asks us for a dir mirror and we don't have one,
  14848. launch an attempt to get a fresh one.
  14849. - If we're hibernating and we get a SIGINT, exit immediately.
  14850. - Add --with-dmalloc ./configure option, to track memory leaks.
  14851. - And try to free all memory on closing, so we can detect what
  14852. we're leaking.
  14853. - Cache local dns resolves correctly even when they're .exit
  14854. addresses.
  14855. - Give a better warning when some other server advertises an
  14856. ORPort that is actually an apache running ssl.
  14857. - Add "opt hibernating 1" to server descriptor to make it clearer
  14858. whether the server is hibernating.
  14859. Changes in version 0.0.9.6 - 2005-03-24
  14860. o Bugfixes on 0.0.9.x (crashes and asserts):
  14861. - Add new end stream reasons to maintainance branch. Fix bug where
  14862. reason (8) could trigger an assert. Prevent bug from recurring.
  14863. - Apparently win32 stat wants paths to not end with a slash.
  14864. - Fix assert triggers in assert_cpath_layer_ok(), where we were
  14865. blowing away the circuit that conn->cpath_layer points to, then
  14866. checking to see if the circ is well-formed. Backport check to make
  14867. sure we dont use the cpath on a closed connection.
  14868. - Prevent circuit_resume_edge_reading_helper() from trying to package
  14869. inbufs for marked-for-close streams.
  14870. - Don't crash on hup if your options->address has become unresolvable.
  14871. - Some systems (like OS X) sometimes accept() a connection and tell
  14872. you the remote host is 0.0.0.0:0. If this happens, due to some
  14873. other mis-features, we get confused; so refuse the conn for now.
  14874. o Bugfixes on 0.0.9.x (other):
  14875. - Fix harmless but scary "Unrecognized content encoding" warn message.
  14876. - Add new stream error reason: TORPROTOCOL reason means "you are not
  14877. speaking a version of Tor I understand; say bye-bye to your stream."
  14878. - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
  14879. into the future, now that we are more tolerant of skew. This
  14880. resolves a bug where a Tor server would refuse to cache a directory
  14881. because all the directories it gets are too far in the future;
  14882. yet the Tor server never logs any complaints about clock skew.
  14883. - Mac packaging magic: make man pages useable, and do not overwrite
  14884. existing torrc files.
  14885. - Make OS X log happily to /var/log/tor/tor.log
  14886. Changes in version 0.0.9.5 - 2005-02-22
  14887. o Bugfixes on 0.0.9.x:
  14888. - Fix an assert race at exit nodes when resolve requests fail.
  14889. - Stop picking unverified dir mirrors--it only leads to misery.
  14890. - Patch from Matt Edman to make NT services work better. Service
  14891. support is still not compiled into the executable by default.
  14892. - Patch from Dmitri Bely so the Tor service runs better under
  14893. the win32 SYSTEM account.
  14894. - Make tor-resolve actually work (?) on Win32.
  14895. - Fix a sign bug when getrlimit claims to have 4+ billion
  14896. file descriptors available.
  14897. - Stop refusing to start when bandwidthburst == bandwidthrate.
  14898. - When create cells have been on the onion queue more than five
  14899. seconds, just send back a destroy and take them off the list.
  14900. Changes in version 0.0.9.4 - 2005-02-03
  14901. o Bugfixes on 0.0.9:
  14902. - Fix an assert bug that took down most of our servers: when
  14903. a server claims to have 1 GB of bandwidthburst, don't
  14904. freak out.
  14905. - Don't crash as badly if we have spawned the max allowed number
  14906. of dnsworkers, or we're out of file descriptors.
  14907. - Block more file-sharing ports in the default exit policy.
  14908. - MaxConn is now automatically set to the hard limit of max
  14909. file descriptors we're allowed (ulimit -n), minus a few for
  14910. logs, etc.
  14911. - Give a clearer message when servers need to raise their
  14912. ulimit -n when they start running out of file descriptors.
  14913. - SGI Compatibility patches from Jan Schaumann.
  14914. - Tolerate a corrupt cached directory better.
  14915. - When a dirserver hasn't approved your server, list which one.
  14916. - Go into soft hibernation after 95% of the bandwidth is used,
  14917. not 99%. This is especially important for daily hibernators who
  14918. have a small accounting max. Hopefully it will result in fewer
  14919. cut connections when the hard hibernation starts.
  14920. - Load-balance better when using servers that claim more than
  14921. 800kB/s of capacity.
  14922. - Make NT services work (experimental, only used if compiled in).
  14923. Changes in version 0.0.9.3 - 2005-01-21
  14924. o Bugfixes on 0.0.9:
  14925. - Backport the cpu use fixes from main branch, so busy servers won't
  14926. need as much processor time.
  14927. - Work better when we go offline and then come back, or when we
  14928. run Tor at boot before the network is up. We do this by
  14929. optimistically trying to fetch a new directory whenever an
  14930. application request comes in and we think we're offline -- the
  14931. human is hopefully a good measure of when the network is back.
  14932. - Backport some minimal hidserv bugfixes: keep rend circuits open as
  14933. long as you keep using them; actually publish hidserv descriptors
  14934. shortly after they change, rather than waiting 20-40 minutes.
  14935. - Enable Mac startup script by default.
  14936. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
  14937. - When you update AllowUnverifiedNodes or FirewallPorts via the
  14938. controller's setconf feature, we were always appending, never
  14939. resetting.
  14940. - When you update HiddenServiceDir via setconf, it was screwing up
  14941. the order of reading the lines, making it fail.
  14942. - Do not rewrite a cached directory back to the cache; otherwise we
  14943. will think it is recent and not fetch a newer one on startup.
  14944. - Workaround for webservers that lie about Content-Encoding: Tor
  14945. now tries to autodetect compressed directories and compression
  14946. itself. This lets us Proxypass dir fetches through apache.
  14947. Changes in version 0.0.9.2 - 2005-01-04
  14948. o Bugfixes on 0.0.9 (crashes and asserts):
  14949. - Fix an assert on startup when the disk is full and you're logging
  14950. to a file.
  14951. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
  14952. style address, then we'd crash.
  14953. - Fix an assert trigger when the running-routers string we get from
  14954. a dirserver is broken.
  14955. - Make worker threads start and run on win32. Now win32 servers
  14956. may work better.
  14957. - Bandaid (not actually fix, but now it doesn't crash) an assert
  14958. where the dns worker dies mysteriously and the main Tor process
  14959. doesn't remember anything about the address it was resolving.
  14960. o Bugfixes on 0.0.9 (Win32):
  14961. - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
  14962. name out of the warning/assert messages.
  14963. - Fix a superficial "unhandled error on read" bug on win32.
  14964. - The win32 installer no longer requires a click-through for our
  14965. license, since our Free Software license grants rights but does not
  14966. take any away.
  14967. - Win32: When connecting to a dirserver fails, try another one
  14968. immediately. (This was already working for non-win32 Tors.)
  14969. - Stop trying to parse $HOME on win32 when hunting for default
  14970. DataDirectory.
  14971. - Make tor-resolve.c work on win32 by calling network_init().
  14972. o Bugfixes on 0.0.9 (other):
  14973. - Make 0.0.9.x build on Solaris again.
  14974. - Due to a fencepost error, we were blowing away the \n when reporting
  14975. confvalue items in the controller. So asking for multiple config
  14976. values at once couldn't work.
  14977. - When listing circuits that are pending on an opening OR connection,
  14978. if we're an OR we were listing circuits that *end* at us as
  14979. being pending on every listener, dns/cpu worker, etc. Stop that.
  14980. - Dirservers were failing to create 'running-routers' or 'directory'
  14981. strings if we had more than some threshold of routers. Fix them so
  14982. they can handle any number of routers.
  14983. - Fix a superficial "Duplicate mark for close" bug.
  14984. - Stop checking for clock skew for OR connections, even for servers.
  14985. - Fix a fencepost error that was chopping off the last letter of any
  14986. nickname that is the maximum allowed nickname length.
  14987. - Update URLs in log messages so they point to the new website.
  14988. - Fix a potential problem in mangling server private keys while
  14989. writing to disk (not triggered yet, as far as we know).
  14990. - Include the licenses for other free software we include in Tor,
  14991. now that we're shipping binary distributions more regularly.
  14992. Changes in version 0.0.9.1 - 2004-12-15
  14993. o Bugfixes on 0.0.9:
  14994. - Make hibernation actually work.
  14995. - Make HashedControlPassword config option work.
  14996. - When we're reporting event circuit status to a controller,
  14997. don't use the stream status code.
  14998. Changes in version 0.0.9 - 2004-12-12
  14999. o Cleanups:
  15000. - Clean up manpage and torrc.sample file.
  15001. - Clean up severities and text of log warnings.
  15002. o Mistakes:
  15003. - Make servers trigger an assert when they enter hibernation.
  15004. Changes in version 0.0.9rc7 - 2004-12-08
  15005. o Bugfixes on 0.0.9rc:
  15006. - Fix a stack-trashing crash when an exit node begins hibernating.
  15007. - Avoid looking at unallocated memory while considering which
  15008. ports we need to build circuits to cover.
  15009. - Stop a sigpipe: when an 'end' cell races with eof from the app,
  15010. we shouldn't hold-open-until-flush if the eof arrived first.
  15011. - Fix a bug with init_cookie_authentication() in the controller.
  15012. - When recommending new-format log lines, if the upper bound is
  15013. LOG_ERR, leave it implicit.
  15014. o Bugfixes on 0.0.8.1:
  15015. - Fix a whole slew of memory leaks.
  15016. - Fix isspace() and friends so they still make Solaris happy
  15017. but also so they don't trigger asserts on win32.
  15018. - Fix parse_iso_time on platforms without strptime (eg win32).
  15019. - win32: tolerate extra "readable" events better.
  15020. - win32: when being multithreaded, leave parent fdarray open.
  15021. - Make unit tests work on win32.
  15022. Changes in version 0.0.9rc6 - 2004-12-06
  15023. o Bugfixes on 0.0.9pre:
  15024. - Clean up some more integer underflow opportunities (not exploitable
  15025. we think).
  15026. - While hibernating, hup should not regrow our listeners.
  15027. - Send an end to the streams we close when we hibernate, rather
  15028. than just chopping them off.
  15029. - React to eof immediately on non-open edge connections.
  15030. o Bugfixes on 0.0.8.1:
  15031. - Calculate timeout for waiting for a connected cell from the time
  15032. we sent the begin cell, not from the time the stream started. If
  15033. it took a long time to establish the circuit, we would time out
  15034. right after sending the begin cell.
  15035. - Fix router_compare_addr_to_addr_policy: it was not treating a port
  15036. of * as always matching, so we were picking reject *:* nodes as
  15037. exit nodes too. Oops.
  15038. o Features:
  15039. - New circuit building strategy: keep a list of ports that we've
  15040. used in the past 6 hours, and always try to have 2 circuits open
  15041. or on the way that will handle each such port. Seed us with port
  15042. 80 so web users won't complain that Tor is "slow to start up".
  15043. - Make kill -USR1 dump more useful stats about circuits.
  15044. - When warning about retrying or giving up, print the address, so
  15045. the user knows which one it's talking about.
  15046. - If you haven't used a clean circuit in an hour, throw it away,
  15047. just to be on the safe side. (This means after 6 hours a totally
  15048. unused Tor client will have no circuits open.)
  15049. Changes in version 0.0.9rc5 - 2004-12-01
  15050. o Bugfixes on 0.0.8.1:
  15051. - Disallow NDEBUG. We don't ever want anybody to turn off debug.
  15052. - Let resolve conns retry/expire also, rather than sticking around
  15053. forever.
  15054. - If we are using select, make sure we stay within FD_SETSIZE.
  15055. o Bugfixes on 0.0.9pre:
  15056. - Fix integer underflow in tor_vsnprintf() that may be exploitable,
  15057. but doesn't seem to be currently; thanks to Ilja van Sprundel for
  15058. finding it.
  15059. - If anybody set DirFetchPostPeriod, give them StatusFetchPeriod
  15060. instead. Impose minima and maxima for all *Period options; impose
  15061. even tighter maxima for fetching if we are a caching dirserver.
  15062. Clip rather than rejecting.
  15063. - Fetch cached running-routers from servers that serve it (that is,
  15064. authdirservers and servers running 0.0.9rc5-cvs or later.)
  15065. o Features:
  15066. - Accept *:706 (silc) in default exit policy.
  15067. - Implement new versioning format for post 0.1.
  15068. - Support "foo.nickname.exit" addresses, to let Alice request the
  15069. address "foo" as viewed by exit node "nickname". Based on a patch
  15070. by Geoff Goodell.
  15071. - Make tor --version --version dump the cvs Id of every file.
  15072. Changes in version 0.0.9rc4 - 2004-11-28
  15073. o Bugfixes on 0.0.8.1:
  15074. - Make windows sockets actually non-blocking (oops), and handle
  15075. win32 socket errors better.
  15076. o Bugfixes on 0.0.9rc1:
  15077. - Actually catch the -USR2 signal.
  15078. Changes in version 0.0.9rc3 - 2004-11-25
  15079. o Bugfixes on 0.0.8.1:
  15080. - Flush the log file descriptor after we print "Tor opening log file",
  15081. so we don't see those messages days later.
  15082. o Bugfixes on 0.0.9rc1:
  15083. - Make tor-resolve work again.
  15084. - Avoid infinite loop in tor-resolve if tor hangs up on it.
  15085. - Fix an assert trigger for clients/servers handling resolves.
  15086. Changes in version 0.0.9rc2 - 2004-11-24
  15087. o Bugfixes on 0.0.9rc1:
  15088. - I broke socks5 support while fixing the eof bug.
  15089. - Allow unitless bandwidths and intervals; they default to bytes
  15090. and seconds.
  15091. - New servers don't start out hibernating; they are active until
  15092. they run out of bytes, so they have a better estimate of how
  15093. long it takes, and so their operators can know they're working.
  15094. Changes in version 0.0.9rc1 - 2004-11-23
  15095. o Bugfixes on 0.0.8.1:
  15096. - Finally fix a bug that's been plaguing us for a year:
  15097. With high load, circuit package window was reaching 0. Whenever
  15098. we got a circuit-level sendme, we were reading a lot on each
  15099. socket, but only writing out a bit. So we would eventually reach
  15100. eof. This would be noticed and acted on even when there were still
  15101. bytes sitting in the inbuf.
  15102. - When poll() is interrupted, we shouldn't believe the revents values.
  15103. o Bugfixes on 0.0.9pre6:
  15104. - Fix hibernate bug that caused pre6 to be broken.
  15105. - Don't keep rephist info for routers that haven't had activity for
  15106. 24 hours. (This matters now that clients have keys, since we track
  15107. them too.)
  15108. - Never call close_temp_logs while validating log options.
  15109. - Fix backslash-escaping on tor.sh.in and torctl.in.
  15110. o Features:
  15111. - Implement weekly/monthly/daily accounting: now you specify your
  15112. hibernation properties by
  15113. AccountingMax N bytes|KB|MB|GB|TB
  15114. AccountingStart day|week|month [day] HH:MM
  15115. Defaults to "month 1 0:00".
  15116. - Let bandwidth and interval config options be specified as 5 bytes,
  15117. kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
  15118. - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
  15119. get back to normal.)
  15120. - If your requested entry or exit node has advertised bandwidth 0,
  15121. pick it anyway.
  15122. - Be more greedy about filling up relay cells -- we try reading again
  15123. once we've processed the stuff we read, in case enough has arrived
  15124. to fill the last cell completely.
  15125. - Apply NT service patch from Osamu Fujino. Still needs more work.
  15126. Changes in version 0.0.9pre6 - 2004-11-15
  15127. o Bugfixes on 0.0.8.1:
  15128. - Fix assert failure on malformed socks4a requests.
  15129. - Use identity comparison, not nickname comparison, to choose which
  15130. half of circuit-ID-space each side gets to use. This is needed
  15131. because sometimes we think of a router as a nickname, and sometimes
  15132. as a hex ID, and we can't predict what the other side will do.
  15133. - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
  15134. write() call will fail and we handle it there.
  15135. - Add a FAST_SMARTLIST define to optionally inline smartlist_get
  15136. and smartlist_len, which are two major profiling offenders.
  15137. o Bugfixes on 0.0.9pre5:
  15138. - Fix a bug in read_all that was corrupting config files on windows.
  15139. - When we're raising the max number of open file descriptors to
  15140. 'unlimited', don't log that we just raised it to '-1'.
  15141. - Include event code with events, as required by control-spec.txt.
  15142. - Don't give a fingerprint when clients do --list-fingerprint:
  15143. it's misleading, because it will never be the same again.
  15144. - Stop using strlcpy in tor_strndup, since it was slowing us
  15145. down a lot.
  15146. - Remove warn on startup about missing cached-directory file.
  15147. - Make kill -USR1 work again.
  15148. - Hibernate if we start tor during the "wait for wakeup-time" phase
  15149. of an accounting interval. Log our hibernation plans better.
  15150. - Authoritative dirservers now also cache their directory, so they
  15151. have it on start-up.
  15152. o Features:
  15153. - Fetch running-routers; cache running-routers; compress
  15154. running-routers; serve compressed running-routers.z
  15155. - Add NSI installer script contributed by J Doe.
  15156. - Commit VC6 and VC7 workspace/project files.
  15157. - Commit a tor.spec for making RPM files, with help from jbash.
  15158. - Add contrib/torctl.in contributed by Glenn Fink.
  15159. - Implement the control-spec's SAVECONF command, to write your
  15160. configuration to torrc.
  15161. - Get cookie authentication for the controller closer to working.
  15162. - Include control-spec.txt in the tarball.
  15163. - When set_conf changes our server descriptor, upload a new copy.
  15164. But don't upload it too often if there are frequent changes.
  15165. - Document authentication config in man page, and document signals
  15166. we catch.
  15167. - Clean up confusing parts of man page and torrc.sample.
  15168. - Make expand_filename handle ~ and ~username.
  15169. - Use autoconf to enable largefile support where necessary. Use
  15170. ftello where available, since ftell can fail at 2GB.
  15171. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
  15172. log more informatively.
  15173. - Give a slightly more useful output for "tor -h".
  15174. - Refuse application socks connections to port 0.
  15175. - Check clock skew for verified servers, but allow unverified
  15176. servers and clients to have any clock skew.
  15177. - Break DirFetchPostPeriod into:
  15178. - DirFetchPeriod for fetching full directory,
  15179. - StatusFetchPeriod for fetching running-routers,
  15180. - DirPostPeriod for posting server descriptor,
  15181. - RendPostPeriod for posting hidden service descriptors.
  15182. - Make sure the hidden service descriptors are at a random offset
  15183. from each other, to hinder linkability.
  15184. Changes in version 0.0.9pre5 - 2004-11-09
  15185. o Bugfixes on 0.0.9pre4:
  15186. - Fix a seg fault in unit tests (doesn't affect main program).
  15187. - Fix an assert bug where a hidden service provider would fail if
  15188. the first hop of his rendezvous circuit was down.
  15189. - Hidden service operators now correctly handle version 1 style
  15190. INTRODUCE1 cells (nobody generates them still, so not a critical
  15191. bug).
  15192. - If do_hup fails, actually notice.
  15193. - Handle more errnos from accept() without closing the listener.
  15194. Some OpenBSD machines were closing their listeners because
  15195. they ran out of file descriptors.
  15196. - Send resolve cells to exit routers that are running a new
  15197. enough version of the resolve code to work right.
  15198. - Better handling of winsock includes on non-MSV win32 compilers.
  15199. - Some people had wrapped their tor client/server in a script
  15200. that would restart it whenever it died. This did not play well
  15201. with our "shut down if your version is obsolete" code. Now people
  15202. don't fetch a new directory if their local cached version is
  15203. recent enough.
  15204. - Make our autogen.sh work on ksh as well as bash.
  15205. o Major Features:
  15206. - Hibernation: New config option "AccountingMaxKB" lets you
  15207. set how many KBytes per month you want to allow your server to
  15208. consume. Rather than spreading those bytes out evenly over the
  15209. month, we instead hibernate for some of the month and pop up
  15210. at a deterministic time, work until the bytes are consumed, then
  15211. hibernate again. Config option "MonthlyAccountingStart" lets you
  15212. specify which day of the month your billing cycle starts on.
  15213. - Control interface: a separate program can now talk to your
  15214. client/server over a socket, and get/set config options, receive
  15215. notifications of circuits and streams starting/finishing/dying,
  15216. bandwidth used, etc. The next step is to get some GUIs working.
  15217. Let us know if you want to help out. See doc/control-spec.txt .
  15218. - Ship a contrib/tor-control.py as an example script to interact
  15219. with the control port.
  15220. - "tor --hash-password zzyxz" will output a salted password for
  15221. use in authenticating to the control interface.
  15222. - New log format in config:
  15223. "Log minsev[-maxsev] stdout|stderr|syslog" or
  15224. "Log minsev[-maxsev] file /var/foo"
  15225. o Minor Features:
  15226. - DirPolicy config option, to let people reject incoming addresses
  15227. from their dirserver.
  15228. - "tor --list-fingerprint" will list your identity key fingerprint
  15229. and then exit.
  15230. - Add "pass" target for RedirectExit, to make it easier to break
  15231. out of a sequence of RedirectExit rules.
  15232. - Clients now generate a TLS cert too, in preparation for having
  15233. them act more like real nodes.
  15234. - Ship src/win32/ in the tarball, so people can use it to build.
  15235. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
  15236. is broken.
  15237. - New "router-status" line in directory, to better bind each verified
  15238. nickname to its identity key.
  15239. - Deprecate unofficial config option abbreviations, and abbreviations
  15240. not on the command line.
  15241. - Add a pure-C tor-resolve implementation.
  15242. - Use getrlimit and friends to ensure we can reach MaxConn (currently
  15243. 1024) file descriptors.
  15244. o Code security improvements, inspired by Ilja:
  15245. - Replace sprintf with snprintf. (I think they were all safe, but
  15246. hey.)
  15247. - Replace strcpy/strncpy with strlcpy in more places.
  15248. - Avoid strcat; use snprintf or strlcat instead.
  15249. - snprintf wrapper with consistent (though not C99) overflow behavior.
  15250. Changes in version 0.0.9pre4 - 2004-10-17
  15251. o Bugfixes on 0.0.9pre3:
  15252. - If the server doesn't specify an exit policy, use the real default
  15253. exit policy, not reject *:*.
  15254. - Ignore fascistfirewall when uploading/downloading hidden service
  15255. descriptors, since we go through Tor for those; and when using
  15256. an HttpProxy, since we assume it can reach them all.
  15257. - When looking for an authoritative dirserver, use only the ones
  15258. configured at boot. Don't bother looking in the directory.
  15259. - The rest of the fix for get_default_conf_file() on older win32.
  15260. - Make 'Routerfile' config option obsolete.
  15261. o Features:
  15262. - New 'MyFamily nick1,...' config option for a server to
  15263. specify other servers that shouldn't be used in the same circuit
  15264. with it. Only believed if nick1 also specifies us.
  15265. - New 'NodeFamily nick1,nick2,...' config option for a client to
  15266. specify nodes that it doesn't want to use in the same circuit.
  15267. - New 'Redirectexit pattern address:port' config option for a
  15268. server to redirect exit connections, e.g. to a local squid.
  15269. Changes in version 0.0.9pre3 - 2004-10-13
  15270. o Bugfixes on 0.0.8.1:
  15271. - Better torrc example lines for dirbindaddress and orbindaddress.
  15272. - Improved bounds checking on parsed ints (e.g. config options and
  15273. the ones we find in directories.)
  15274. - Better handling of size_t vs int, so we're more robust on 64
  15275. bit platforms.
  15276. - Fix the rest of the bug where a newly started OR would appear
  15277. as unverified even after we've added his fingerprint and hupped
  15278. the dirserver.
  15279. - Fix a bug from 0.0.7: when read() failed on a stream, we would
  15280. close it without sending back an end. So 'connection refused'
  15281. would simply be ignored and the user would get no response.
  15282. o Bugfixes on 0.0.9pre2:
  15283. - Serving the cached-on-disk directory to people is bad. We now
  15284. provide no directory until we've fetched a fresh one.
  15285. - Workaround for bug on windows where cached-directories get crlf
  15286. corruption.
  15287. - Make get_default_conf_file() work on older windows too.
  15288. - If we write a *:* exit policy line in the descriptor, don't write
  15289. any more exit policy lines.
  15290. o Features:
  15291. - Use only 0.0.9pre1 and later servers for resolve cells.
  15292. - Make the dirservers file obsolete.
  15293. - Include a dir-signing-key token in directories to tell the
  15294. parsing entity which key is being used to sign.
  15295. - Remove the built-in bulky default dirservers string.
  15296. - New config option "Dirserver %s:%d [fingerprint]", which can be
  15297. repeated as many times as needed. If no dirservers specified,
  15298. default to moria1,moria2,tor26.
  15299. - Make moria2 advertise a dirport of 80, so people behind firewalls
  15300. will be able to get a directory.
  15301. - Http proxy support
  15302. - Dirservers translate requests for http://%s:%d/x to /x
  15303. - You can specify "HttpProxy %s[:%d]" and all dir fetches will
  15304. be routed through this host.
  15305. - Clients ask for /tor/x rather than /x for new enough dirservers.
  15306. This way we can one day coexist peacefully with apache.
  15307. - Clients specify a "Host: %s%d" http header, to be compatible
  15308. with more proxies, and so running squid on an exit node can work.
  15309. Changes in version 0.0.8.1 - 2004-10-13
  15310. o Bugfixes:
  15311. - Fix a seg fault that can be triggered remotely for Tor
  15312. clients/servers with an open dirport.
  15313. - Fix a rare assert trigger, where routerinfos for entries in
  15314. our cpath would expire while we're building the path.
  15315. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  15316. - Fix a rare seg fault for people running hidden services on
  15317. intermittent connections.
  15318. - Fix a bug in parsing opt keywords with objects.
  15319. - Fix a stale pointer assert bug when a stream detaches and
  15320. reattaches.
  15321. - Fix a string format vulnerability (probably not exploitable)
  15322. in reporting stats locally.
  15323. - Fix an assert trigger: sometimes launching circuits can fail
  15324. immediately, e.g. because too many circuits have failed recently.
  15325. - Fix a compile warning on 64 bit platforms.
  15326. Changes in version 0.0.9pre2 - 2004-10-03
  15327. o Bugfixes:
  15328. - Make fetching a cached directory work for 64-bit platforms too.
  15329. - Make zlib.h a required header, not an optional header.
  15330. Changes in version 0.0.9pre1 - 2004-10-01
  15331. o Bugfixes:
  15332. - Stop using separate defaults for no-config-file and
  15333. empty-config-file. Now you have to explicitly turn off SocksPort,
  15334. if you don't want it open.
  15335. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  15336. - Improve man page to mention more of the 0.0.8 features.
  15337. - Fix a rare seg fault for people running hidden services on
  15338. intermittent connections.
  15339. - Change our file IO stuff (especially wrt OpenSSL) so win32 is
  15340. happier.
  15341. - Fix more dns related bugs: send back resolve_failed and end cells
  15342. more reliably when the resolve fails, rather than closing the
  15343. circuit and then trying to send the cell. Also attach dummy resolve
  15344. connections to a circuit *before* calling dns_resolve(), to fix
  15345. a bug where cached answers would never be sent in RESOLVED cells.
  15346. - When we run out of disk space, or other log writing error, don't
  15347. crash. Just stop logging to that log and continue.
  15348. - We were starting to daemonize before we opened our logs, so if
  15349. there were any problems opening logs, we would complain to stderr,
  15350. which wouldn't work, and then mysteriously exit.
  15351. - Fix a rare bug where sometimes a verified OR would connect to us
  15352. before he'd uploaded his descriptor, which would cause us to
  15353. assign conn->nickname as though he's unverified. Now we look through
  15354. the fingerprint list to see if he's there.
  15355. - Fix a rare assert trigger, where routerinfos for entries in
  15356. our cpath would expire while we're building the path.
  15357. o Features:
  15358. - Clients can ask dirservers for /dir.z to get a compressed version
  15359. of the directory. Only works for servers running 0.0.9, of course.
  15360. - Make clients cache directories and use them to seed their router
  15361. lists at startup. This means clients have a datadir again.
  15362. - Configuration infrastructure support for warning on obsolete
  15363. options.
  15364. - Respond to content-encoding headers by trying to uncompress as
  15365. appropriate.
  15366. - Reply with a deflated directory when a client asks for "dir.z".
  15367. We could use allow-encodings instead, but allow-encodings isn't
  15368. specified in HTTP 1.0.
  15369. - Raise the max dns workers from 50 to 100.
  15370. - Discourage people from setting their dirfetchpostperiod more often
  15371. than once per minute.
  15372. - Protect dirservers from overzealous descriptor uploading -- wait
  15373. 10 seconds after directory gets dirty, before regenerating.
  15374. Changes in version 0.0.8 - 2004-08-25
  15375. o Port it to SunOS 5.9 / Athena
  15376. Changes in version 0.0.8rc2 - 2004-08-20
  15377. o Make it compile on cygwin again.
  15378. o When picking unverified routers, skip those with low uptime and/or
  15379. low bandwidth, depending on what properties you care about.
  15380. Changes in version 0.0.8rc1 - 2004-08-18
  15381. o Changes from 0.0.7.3:
  15382. - Bugfixes:
  15383. - Fix assert triggers: if the other side returns an address 0.0.0.0,
  15384. don't put it into the client dns cache.
  15385. - If a begin failed due to exit policy, but we believe the IP address
  15386. should have been allowed, switch that router to exitpolicy reject *:*
  15387. until we get our next directory.
  15388. - Features:
  15389. - Clients choose nodes proportional to advertised bandwidth.
  15390. - Avoid using nodes with low uptime as introduction points.
  15391. - Handle servers with dynamic IP addresses: don't replace
  15392. options->Address with the resolved one at startup, and
  15393. detect our address right before we make a routerinfo each time.
  15394. - 'FascistFirewall' option to pick dirservers and ORs on specific
  15395. ports; plus 'FirewallPorts' config option to tell FascistFirewall
  15396. which ports are open. (Defaults to 80,443)
  15397. - Be more aggressive about trying to make circuits when the network
  15398. has changed (e.g. when you unsuspend your laptop).
  15399. - Check for time skew on http headers; report date in response to
  15400. "GET /".
  15401. - If the entrynode config line has only one node, don't pick it as
  15402. an exitnode.
  15403. - Add strict{entry|exit}nodes config options. If set to 1, then
  15404. we refuse to build circuits that don't include the specified entry
  15405. or exit nodes.
  15406. - OutboundBindAddress config option, to bind to a specific
  15407. IP address for outgoing connect()s.
  15408. - End truncated log entries (e.g. directories) with "[truncated]".
  15409. o Patches to 0.0.8preX:
  15410. - Bugfixes:
  15411. - Patches to compile and run on win32 again (maybe)?
  15412. - Fix crash when looking for ~/.torrc with no $HOME set.
  15413. - Fix a race bug in the unit tests.
  15414. - Handle verified/unverified name collisions better when new
  15415. routerinfo's arrive in a directory.
  15416. - Sometimes routers were getting entered into the stats before
  15417. we'd assigned their identity_digest. Oops.
  15418. - Only pick and establish intro points after we've gotten a
  15419. directory.
  15420. - Features:
  15421. - AllowUnverifiedNodes config option to let circuits choose no-name
  15422. routers in entry,middle,exit,introduction,rendezvous positions.
  15423. Allow middle and rendezvous positions by default.
  15424. - Add a man page for tor-resolve.
  15425. Changes in version 0.0.7.3 - 2004-08-12
  15426. o Stop dnsworkers from triggering an assert failure when you
  15427. ask them to resolve the host "".
  15428. Changes in version 0.0.8pre3 - 2004-08-09
  15429. o Changes from 0.0.7.2:
  15430. - Allow multiple ORs with same nickname in routerlist -- now when
  15431. people give us one identity key for a nickname, then later
  15432. another, we don't constantly complain until the first expires.
  15433. - Remember used bandwidth (both in and out), and publish 15-minute
  15434. snapshots for the past day into our descriptor.
  15435. - You can now fetch $DIRURL/running-routers to get just the
  15436. running-routers line, not the whole descriptor list. (But
  15437. clients don't use this yet.)
  15438. - When people mistakenly use Tor as an http proxy, point them
  15439. at the tor-doc.html rather than the INSTALL.
  15440. - Remove our mostly unused -- and broken -- hex_encode()
  15441. function. Use base16_encode() instead. (Thanks to Timo Lindfors
  15442. for pointing out this bug.)
  15443. - Rotate onion keys every 12 hours, not every 2 hours, so we have
  15444. fewer problems with people using the wrong key.
  15445. - Change the default exit policy to reject the default edonkey,
  15446. kazaa, gnutella ports.
  15447. - Add replace_file() to util.[ch] to handle win32's rename().
  15448. o Changes from 0.0.8preX:
  15449. - Fix two bugs in saving onion keys to disk when rotating, so
  15450. hopefully we'll get fewer people using old onion keys.
  15451. - Fix an assert error that was making SocksPolicy not work.
  15452. - Be willing to expire routers that have an open dirport -- it's
  15453. just the authoritative dirservers we want to not forget.
  15454. - Reject tor-resolve requests for .onion addresses early, so we
  15455. don't build a whole rendezvous circuit and then fail.
  15456. - When you're warning a server that he's unverified, don't cry
  15457. wolf unpredictably.
  15458. - Fix a race condition: don't try to extend onto a connection
  15459. that's still handshaking.
  15460. - For servers in clique mode, require the conn to be open before
  15461. you'll choose it for your path.
  15462. - Fix some cosmetic bugs about duplicate mark-for-close, lack of
  15463. end relay cell, etc.
  15464. - Measure bandwidth capacity over the last 24 hours, not just 12
  15465. - Bugfix: authoritative dirservers were making and signing a new
  15466. directory for each client, rather than reusing the cached one.
  15467. Changes in version 0.0.8pre2 - 2004-08-04
  15468. o Changes from 0.0.7.2:
  15469. - Security fixes:
  15470. - Check directory signature _before_ you decide whether you're
  15471. you're running an obsolete version and should exit.
  15472. - Check directory signature _before_ you parse the running-routers
  15473. list to decide who's running or verified.
  15474. - Bugfixes and features:
  15475. - Check return value of fclose while writing to disk, so we don't
  15476. end up with broken files when servers run out of disk space.
  15477. - Log a warning if the user uses an unsafe socks variant, so people
  15478. are more likely to learn about privoxy or socat.
  15479. - Dirservers now include RFC1123-style dates in the HTTP headers,
  15480. which one day we will use to better detect clock skew.
  15481. o Changes from 0.0.8pre1:
  15482. - Make it compile without warnings again on win32.
  15483. - Log a warning if you're running an unverified server, to let you
  15484. know you might want to get it verified.
  15485. - Only pick a default nickname if you plan to be a server.
  15486. Changes in version 0.0.8pre1 - 2004-07-23
  15487. o Bugfixes:
  15488. - Made our unit tests compile again on OpenBSD 3.5, and tor
  15489. itself compile again on OpenBSD on a sparc64.
  15490. - We were neglecting milliseconds when logging on win32, so
  15491. everything appeared to happen at the beginning of each second.
  15492. o Protocol changes:
  15493. - 'Extend' relay cell payloads now include the digest of the
  15494. intended next hop's identity key. Now we can verify that we're
  15495. extending to the right router, and also extend to routers we
  15496. hadn't heard of before.
  15497. o Features:
  15498. - Tor nodes can now act as relays (with an advertised ORPort)
  15499. without being manually verified by the dirserver operators.
  15500. - Uploaded descriptors of unverified routers are now accepted
  15501. by the dirservers, and included in the directory.
  15502. - Verified routers are listed by nickname in the running-routers
  15503. list; unverified routers are listed as "$<fingerprint>".
  15504. - We now use hash-of-identity-key in most places rather than
  15505. nickname or addr:port, for improved security/flexibility.
  15506. - To avoid Sybil attacks, paths still use only verified servers.
  15507. But now we have a chance to play around with hybrid approaches.
  15508. - Nodes track bandwidth usage to estimate capacity (not used yet).
  15509. - ClientOnly option for nodes that never want to become servers.
  15510. - Directory caching.
  15511. - "AuthoritativeDir 1" option for the official dirservers.
  15512. - Now other nodes (clients and servers) will cache the latest
  15513. directory they've pulled down.
  15514. - They can enable their DirPort to serve it to others.
  15515. - Clients will pull down a directory from any node with an open
  15516. DirPort, and check the signature/timestamp correctly.
  15517. - Authoritative dirservers now fetch directories from other
  15518. authdirservers, to stay better synced.
  15519. - Running-routers list tells who's down also, along with noting
  15520. if they're verified (listed by nickname) or unverified (listed
  15521. by hash-of-key).
  15522. - Allow dirservers to serve running-router list separately.
  15523. This isn't used yet.
  15524. - ORs connect-on-demand to other ORs
  15525. - If you get an extend cell to an OR you're not connected to,
  15526. connect, handshake, and forward the create cell.
  15527. - The authoritative dirservers stay connected to everybody,
  15528. and everybody stays connected to 0.0.7 servers, but otherwise
  15529. clients/servers expire unused connections after 5 minutes.
  15530. - When servers get a sigint, they delay 30 seconds (refusing new
  15531. connections) then exit. A second sigint causes immediate exit.
  15532. - File and name management:
  15533. - Look for .torrc if no CONFDIR "torrc" is found.
  15534. - If no datadir is defined, then choose, make, and secure ~/.tor
  15535. as datadir.
  15536. - If torrc not found, exitpolicy reject *:*.
  15537. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
  15538. - If no nickname is defined, derive default from hostname.
  15539. - Rename secret key files, e.g. identity.key -> secret_id_key,
  15540. to discourage people from mailing their identity key to tor-ops.
  15541. - Refuse to build a circuit before the directory has arrived --
  15542. it won't work anyway, since you won't know the right onion keys
  15543. to use.
  15544. - Try other dirservers immediately if the one you try is down. This
  15545. should tolerate down dirservers better now.
  15546. - Parse tor version numbers so we can do an is-newer-than check
  15547. rather than an is-in-the-list check.
  15548. - New socks command 'resolve', to let us shim gethostbyname()
  15549. locally.
  15550. - A 'tor_resolve' script to access the socks resolve functionality.
  15551. - A new socks-extensions.txt doc file to describe our
  15552. interpretation and extensions to the socks protocols.
  15553. - Add a ContactInfo option, which gets published in descriptor.
  15554. - Publish OR uptime in descriptor (and thus in directory) too.
  15555. - Write tor version at the top of each log file
  15556. - New docs in the tarball:
  15557. - tor-doc.html.
  15558. - Document that you should proxy your SSL traffic too.
  15559. Changes in version 0.0.7.2 - 2004-07-07
  15560. o A better fix for the 0.0.0.0 problem, that will hopefully
  15561. eliminate the remaining related assertion failures.
  15562. Changes in version 0.0.7.1 - 2004-07-04
  15563. o When an address resolves to 0.0.0.0, treat it as a failed resolve,
  15564. since internally we use 0.0.0.0 to signify "not yet resolved".
  15565. Changes in version 0.0.7 - 2004-06-07
  15566. o Updated the man page to reflect the new features.
  15567. Changes in version 0.0.7rc2 - 2004-06-06
  15568. o Changes from 0.0.7rc1:
  15569. - Make it build on Win32 again.
  15570. o Changes from 0.0.6.2:
  15571. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
  15572. settings too.
  15573. Changes in version 0.0.7rc1 - 2004-06-02
  15574. o Bugfixes:
  15575. - On sighup, we were adding another log without removing the first
  15576. one. So log messages would get duplicated n times for n sighups.
  15577. - Several cases of using a connection after we'd freed it. The
  15578. problem was that connections that are pending resolve are in both
  15579. the pending_resolve tree, and also the circuit's resolving_streams
  15580. list. When you want to remove one, you must remove it from both.
  15581. - Fix a double-mark-for-close where an end cell arrived for a
  15582. resolving stream, and then the resolve failed.
  15583. - Check directory signatures based on name of signer, not on whom
  15584. we got the directory from. This will let us cache directories more
  15585. easily.
  15586. o Features:
  15587. - Crank up some of our constants to handle more users.
  15588. Changes in version 0.0.7pre1 - 2004-06-02
  15589. o Fixes for crashes and other obnoxious bugs:
  15590. - Fix an epipe bug: sometimes when directory connections failed
  15591. to connect, we would give them a chance to flush before closing
  15592. them.
  15593. - When we detached from a circuit because of resolvefailed, we
  15594. would immediately try the same circuit twice more, and then
  15595. give up on the resolve thinking we'd tried three different
  15596. exit nodes.
  15597. - Limit the number of intro circuits we'll attempt to build for a
  15598. hidden service per 15-minute period.
  15599. - Check recommended-software string *early*, before actually parsing
  15600. the directory. Thus we can detect an obsolete version and exit,
  15601. even if the new directory format doesn't parse.
  15602. o Fixes for security bugs:
  15603. - Remember which nodes are dirservers when you startup, and if a
  15604. random OR enables his dirport, don't automatically assume he's
  15605. a trusted dirserver.
  15606. o Other bugfixes:
  15607. - Directory connections were asking the wrong poll socket to
  15608. start writing, and not asking themselves to start writing.
  15609. - When we detached from a circuit because we sent a begin but
  15610. didn't get a connected, we would use it again the first time;
  15611. but after that we would correctly switch to a different one.
  15612. - Stop warning when the first onion decrypt attempt fails; they
  15613. will sometimes legitimately fail now that we rotate keys.
  15614. - Override unaligned-access-ok check when $host_cpu is ia64 or
  15615. arm. Apparently they allow it but the kernel whines.
  15616. - Dirservers try to reconnect periodically too, in case connections
  15617. have failed.
  15618. - Fix some memory leaks in directory servers.
  15619. - Allow backslash in Win32 filenames.
  15620. - Made Tor build complain-free on FreeBSD, hopefully without
  15621. breaking other BSD builds. We'll see.
  15622. o Features:
  15623. - Doxygen markup on all functions and global variables.
  15624. - Make directory functions update routerlist, not replace it. So
  15625. now directory disagreements are not so critical a problem.
  15626. - Remove the upper limit on number of descriptors in a dirserver's
  15627. directory (not that we were anywhere close).
  15628. - Allow multiple logfiles at different severity ranges.
  15629. - Allow *BindAddress to specify ":port" rather than setting *Port
  15630. separately. Allow multiple instances of each BindAddress config
  15631. option, so you can bind to multiple interfaces if you want.
  15632. - Allow multiple exit policy lines, which are processed in order.
  15633. Now we don't need that huge line with all the commas in it.
  15634. - Enable accept/reject policies on SOCKS connections, so you can bind
  15635. to 0.0.0.0 but still control who can use your OP.
  15636. Changes in version 0.0.6.2 - 2004-05-16
  15637. o Our integrity-checking digest was checking only the most recent cell,
  15638. not the previous cells like we'd thought.
  15639. Thanks to Stefan Mark for finding the flaw!
  15640. Changes in version 0.0.6.1 - 2004-05-06
  15641. o Fix two bugs in our AES counter-mode implementation (this affected
  15642. onion-level stream encryption, but not TLS-level). It turns
  15643. out we were doing something much more akin to a 16-character
  15644. polyalphabetic cipher. Oops.
  15645. Thanks to Stefan Mark for finding the flaw!
  15646. o Retire moria3 as a directory server, and add tor26 as a directory
  15647. server.
  15648. Changes in version 0.0.6 - 2004-05-02
  15649. [version bump only]
  15650. Changes in version 0.0.6rc4 - 2004-05-01
  15651. o Update the built-in dirservers list to use the new directory format
  15652. o Fix a rare seg fault: if a node offering a hidden service attempts
  15653. to build a circuit to Alice's rendezvous point and fails before it
  15654. reaches the last hop, it retries with a different circuit, but
  15655. then dies.
  15656. o Handle windows socket errors correctly.
  15657. Changes in version 0.0.6rc3 - 2004-04-28
  15658. o Don't expire non-general excess circuits (if we had enough
  15659. circuits open, we were expiring rendezvous circuits -- even
  15660. when they had a stream attached. oops.)
  15661. o Fetch randomness from /dev/urandom better (not via fopen/fread)
  15662. o Better debugging for tls errors
  15663. o Some versions of openssl have an SSL_pending function that erroneously
  15664. returns bytes when there is a non-application record pending.
  15665. o Set Content-Type on the directory and hidserv descriptor.
  15666. o Remove IVs from cipher code, since AES-ctr has none.
  15667. o Win32 fixes. Tor now compiles on win32 with no warnings/errors.
  15668. o We were using an array of length zero in a few places.
  15669. o win32's gethostbyname can't resolve an IP to an IP.
  15670. o win32's close can't close a socket.
  15671. Changes in version 0.0.6rc2 - 2004-04-26
  15672. o Fix a bug where we were closing tls connections intermittently.
  15673. It turns out openssl keeps its errors around -- so if an error
  15674. happens, and you don't ask about it, and then another openssl
  15675. operation happens and succeeds, and you ask if there was an error,
  15676. it tells you about the first error. Fun fun.
  15677. o Fix a bug that's been lurking since 27 may 03 (!)
  15678. When passing back a destroy cell, we would use the wrong circ id.
  15679. 'Mostly harmless', but still worth fixing.
  15680. o Since we don't support truncateds much, don't bother sending them;
  15681. just close the circ.
  15682. o check for <machine/limits.h> so we build on NetBSD again (I hope).
  15683. o don't crash if a conn that sent a begin has suddenly lost its circuit
  15684. (this was quite rare).
  15685. Changes in version 0.0.6rc1 - 2004-04-25
  15686. o We now rotate link (tls context) keys and onion keys.
  15687. o CREATE cells now include oaep padding, so you can tell
  15688. if you decrypted them correctly.
  15689. o Add bandwidthburst to server descriptor.
  15690. o Directories now say which dirserver signed them.
  15691. o Use a tor_assert macro that logs failed assertions too.
  15692. Changes in version 0.0.6pre5 - 2004-04-18
  15693. o changes from 0.0.6pre4:
  15694. - make tor build on broken freebsd 5.2 installs
  15695. - fix a failed assert when you try an intro point, get a nack, and try
  15696. a second one and it works.
  15697. - when alice uses a port that the hidden service doesn't accept,
  15698. it now sends back an end cell (denied by exit policy). otherwise
  15699. alice would just have to wait to time out.
  15700. - fix another rare bug: when we had tried all the intro
  15701. points for a hidden service, we fetched the descriptor
  15702. again, but we left our introcirc thinking it had already
  15703. sent an intro, so it kept waiting for a response...
  15704. - bugfix: when you sleep your hidden-service laptop, as soon
  15705. as it wakes up it tries to upload a service descriptor, but
  15706. socketpair fails for some reason (localhost not up yet?).
  15707. now we simply give up on that upload, and we'll try again later.
  15708. i'd still like to find the bug though.
  15709. - if an intro circ waiting for an ack dies before getting one, then
  15710. count it as a nack
  15711. - we were reusing stale service descriptors and refetching usable
  15712. ones. oops.
  15713. Changes in version 0.0.6pre4 - 2004-04-14
  15714. o changes from 0.0.6pre3:
  15715. - when bob fails to connect to the rendezvous point, and his
  15716. circ didn't fail because of the rendezvous point itself, then
  15717. he retries a couple of times
  15718. - we expire introduction and rendezvous circs more thoroughly
  15719. (sometimes they were hanging around forever)
  15720. - we expire unattached rendezvous streams that have been around
  15721. too long (they were sticking around forever).
  15722. - fix a measly fencepost error that was crashing everybody with
  15723. a strict glibc.
  15724. Changes in version 0.0.6pre3 - 2004-04-14
  15725. o changes from 0.0.6pre2:
  15726. - make hup work again
  15727. - fix some memory leaks for dirservers
  15728. - allow more skew in rendezvous descriptor timestamps, to help
  15729. handle people like blanu who don't know what time it is
  15730. - normal circs are 3 hops, but some rend/intro circs are 4, if
  15731. the initiator doesn't get to choose the last hop
  15732. - send acks for introductions, so alice can know whether to try
  15733. again
  15734. - bob publishes intro points more correctly
  15735. o changes from 0.0.5:
  15736. - fix an assert trigger that's been plaguing us since the days
  15737. of 0.0.2prexx (thanks weasel!)
  15738. - retry stream correctly when we fail to connect because of
  15739. exit-policy-reject (should try another) or can't-resolve-address
  15740. (also should try another, because dns on random internet servers
  15741. is flaky).
  15742. - when we hup a dirserver and we've *removed* a server from the
  15743. approved-routers list, now we remove that server from the
  15744. in-memory directories too
  15745. Changes in version 0.0.6pre2 - 2004-04-08
  15746. o We fixed our base32 implementation. Now it works on all architectures.
  15747. Changes in version 0.0.6pre1 - 2004-04-08
  15748. o Features:
  15749. - Hidden services and rendezvous points are implemented. Go to
  15750. http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
  15751. hidden services. (This only works via a socks4a proxy such as
  15752. Privoxy, and currently it's quite slow.)
  15753. Changes in version 0.0.5 - 2004-03-30
  15754. [version bump only]
  15755. Changes in version 0.0.5rc3 - 2004-03-29
  15756. o Install torrc as torrc.sample -- we no longer clobber your
  15757. torrc. (Woo!)
  15758. o Re-enable recommendedversion checking (we broke it in rc2, oops)
  15759. o Add in a 'notice' log level for things the operator should hear
  15760. but that aren't warnings
  15761. Changes in version 0.0.5rc2 - 2004-03-29
  15762. o Hold socks connection open until reply is flushed (if possible)
  15763. o Make exit nodes resolve IPs to IPs immediately, rather than asking
  15764. the dns farm to do it.
  15765. o Fix c99 aliasing warnings in rephist.c
  15766. o Don't include server descriptors that are older than 24 hours in the
  15767. directory.
  15768. o Give socks 'reject' replies their whole 15s to attempt to flush,
  15769. rather than seeing the 60s timeout and assuming the flush had failed.
  15770. o Clean automake droppings from the cvs repository
  15771. Changes in version 0.0.5rc1 - 2004-03-28
  15772. o Fix mangled-state bug in directory fetching (was causing sigpipes).
  15773. o Only build circuits after we've fetched the directory: clients were
  15774. using only the directory servers before they'd fetched a directory.
  15775. This also means longer startup time; so it goes.
  15776. o Fix an assert trigger where an OP would fail to handshake, and we'd
  15777. expect it to have a nickname.
  15778. o Work around a tsocks bug: do a socks reject when AP connection dies
  15779. early, else tsocks goes into an infinite loop.
  15780. Changes in version 0.0.4 - 2004-03-26
  15781. o When connecting to a dirserver or OR and the network is down,
  15782. we would crash.
  15783. Changes in version 0.0.3 - 2004-03-26
  15784. o Warn and fail if server chose a nickname with illegal characters
  15785. o Port to Solaris and Sparc:
  15786. - include missing header fcntl.h
  15787. - have autoconf find -lsocket -lnsl automatically
  15788. - deal with hardware word alignment
  15789. - make uname() work (solaris has a different return convention)
  15790. - switch from using signal() to sigaction()
  15791. o Preliminary work on reputation system:
  15792. - Keep statistics on success/fail of connect attempts; they're published
  15793. by kill -USR1 currently.
  15794. - Add a RunTesting option to try to learn link state by creating test
  15795. circuits, even when SocksPort is off.
  15796. - Remove unused open circuits when there are too many.
  15797. Changes in version 0.0.2 - 2004-03-19
  15798. - Include strlcpy and strlcat for safer string ops
  15799. - define INADDR_NONE so we compile (but still not run) on solaris
  15800. Changes in version 0.0.2pre27 - 2004-03-14
  15801. o Bugfixes:
  15802. - Allow internal tor networks (we were rejecting internal IPs,
  15803. now we allow them if they're set explicitly).
  15804. - And fix a few endian issues.
  15805. Changes in version 0.0.2pre26 - 2004-03-14
  15806. o New features:
  15807. - If a stream times out after 15s without a connected cell, don't
  15808. try that circuit again: try a new one.
  15809. - Retry streams at most 4 times. Then give up.
  15810. - When a dirserver gets a descriptor from an unknown router, it
  15811. logs its fingerprint (so the dirserver operator can choose to
  15812. accept it even without mail from the server operator).
  15813. - Inform unapproved servers when we reject their descriptors.
  15814. - Make tor build on Windows again. It works as a client, who knows
  15815. about as a server.
  15816. - Clearer instructions in the torrc for how to set up a server.
  15817. - Be more efficient about reading fd's when our global token bucket
  15818. (used for rate limiting) becomes empty.
  15819. o Bugfixes:
  15820. - Stop asserting that computers always go forward in time. It's
  15821. simply not true.
  15822. - When we sent a cell (e.g. destroy) and then marked an OR connection
  15823. expired, we might close it before finishing a flush if the other
  15824. side isn't reading right then.
  15825. - Don't allow dirservers to start if they haven't defined
  15826. RecommendedVersions
  15827. - We were caching transient dns failures. Oops.
  15828. - Prevent servers from publishing an internal IP as their address.
  15829. - Address a strcat vulnerability in circuit.c
  15830. Changes in version 0.0.2pre25 - 2004-03-04
  15831. o New features:
  15832. - Put the OR's IP in its router descriptor, not its fqdn. That way
  15833. we'll stop being stalled by gethostbyname for nodes with flaky dns,
  15834. e.g. poblano.
  15835. o Bugfixes:
  15836. - If the user typed in an address that didn't resolve, the server
  15837. crashed.
  15838. Changes in version 0.0.2pre24 - 2004-03-03
  15839. o Bugfixes:
  15840. - Fix an assertion failure in dns.c, where we were trying to dequeue
  15841. a pending dns resolve even if it wasn't pending
  15842. - Fix a spurious socks5 warning about still trying to write after the
  15843. connection is finished.
  15844. - Hold certain marked_for_close connections open until they're finished
  15845. flushing, rather than losing bytes by closing them too early.
  15846. - Correctly report the reason for ending a stream
  15847. - Remove some duplicate calls to connection_mark_for_close
  15848. - Put switch_id and start_daemon earlier in the boot sequence, so it
  15849. will actually try to chdir() to options.DataDirectory
  15850. - Make 'make test' exit(1) if a test fails; fix some unit tests
  15851. - Make tor fail when you use a config option it doesn't know about,
  15852. rather than warn and continue.
  15853. - Make --version work
  15854. - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
  15855. Changes in version 0.0.2pre23 - 2004-02-29
  15856. o New features:
  15857. - Print a statement when the first circ is finished, so the user
  15858. knows it's working.
  15859. - If a relay cell is unrecognized at the end of the circuit,
  15860. send back a destroy. (So attacks to mutate cells are more
  15861. clearly thwarted.)
  15862. - New config option 'excludenodes' to avoid certain nodes for circuits.
  15863. - When it daemonizes, it chdir's to the DataDirectory rather than "/",
  15864. so you can collect coredumps there.
  15865. o Bugfixes:
  15866. - Fix a bug in tls flushing where sometimes data got wedged and
  15867. didn't flush until more data got sent. Hopefully this bug was
  15868. a big factor in the random delays we were seeing.
  15869. - Make 'connected' cells include the resolved IP, so the client
  15870. dns cache actually gets populated.
  15871. - Disallow changing from ORPort=0 to ORPort>0 on hup.
  15872. - When we time-out on a stream and detach from the circuit, send an
  15873. end cell down it first.
  15874. - Only warn about an unknown router (in exitnodes, entrynodes,
  15875. excludenodes) after we've fetched a directory.
  15876. Changes in version 0.0.2pre22 - 2004-02-26
  15877. o New features:
  15878. - Servers publish less revealing uname information in descriptors.
  15879. - More memory tracking and assertions, to crash more usefully when
  15880. errors happen.
  15881. - If the default torrc isn't there, just use some default defaults.
  15882. Plus provide an internal dirservers file if they don't have one.
  15883. - When the user tries to use Tor as an http proxy, give them an http
  15884. 501 failure explaining that we're a socks proxy.
  15885. - Dump a new router.desc on hup, to help confused people who change
  15886. their exit policies and then wonder why router.desc doesn't reflect
  15887. it.
  15888. - Clean up the generic tor.sh init script that we ship with.
  15889. o Bugfixes:
  15890. - If the exit stream is pending on the resolve, and a destroy arrives,
  15891. then the stream wasn't getting removed from the pending list. I
  15892. think this was the one causing recent server crashes.
  15893. - Use a more robust poll on OSX 10.3, since their poll is flaky.
  15894. - When it couldn't resolve any dirservers, it was useless from then on.
  15895. Now it reloads the RouterFile (or default dirservers) if it has no
  15896. dirservers.
  15897. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
  15898. many users don't even *have* a /usr/local/sbin/.
  15899. Changes in version 0.0.2pre21 - 2004-02-18
  15900. o New features:
  15901. - There's a ChangeLog file that actually reflects the changelog.
  15902. - There's a 'torify' wrapper script, with an accompanying
  15903. tor-tsocks.conf, that simplifies the process of using tsocks for
  15904. tor. It even has a man page.
  15905. - The tor binary gets installed to sbin rather than bin now.
  15906. - Retry streams where the connected cell hasn't arrived in 15 seconds
  15907. - Clean up exit policy handling -- get the default out of the torrc,
  15908. so we can update it without forcing each server operator to fix
  15909. his/her torrc.
  15910. - Allow imaps and pop3s in default exit policy
  15911. o Bugfixes:
  15912. - Prevent picking middleman nodes as the last node in the circuit
  15913. Changes in version 0.0.2pre20 - 2004-01-30
  15914. o New features:
  15915. - We now have a deb package, and it's in debian unstable. Go to
  15916. it, apt-getters. :)
  15917. - I've split the TotalBandwidth option into BandwidthRate (how many
  15918. bytes per second you want to allow, long-term) and
  15919. BandwidthBurst (how many bytes you will allow at once before the cap
  15920. kicks in). This better token bucket approach lets you, say, set
  15921. BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
  15922. performance while not exceeding your monthly bandwidth quota.
  15923. - Push out a tls record's worth of data once you've got it, rather
  15924. than waiting until you've read everything waiting to be read. This
  15925. may improve performance by pipelining better. We'll see.
  15926. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
  15927. from failed circuits (if they haven't been connected yet) and attach
  15928. to new ones.
  15929. - Expire old streams that haven't managed to connect. Some day we'll
  15930. have them reattach to new circuits instead.
  15931. o Bugfixes:
  15932. - Fix several memory leaks that were causing servers to become bloated
  15933. after a while.
  15934. - Fix a few very rare assert triggers. A few more remain.
  15935. - Setuid to User _before_ complaining about running as root.
  15936. Changes in version 0.0.2pre19 - 2004-01-07
  15937. o Bugfixes:
  15938. - Fix deadlock condition in dns farm. We were telling a child to die by
  15939. closing the parent's file descriptor to him. But newer children were
  15940. inheriting the open file descriptor from the parent, and since they
  15941. weren't closing it, the socket never closed, so the child never read
  15942. eof, so he never knew to exit. Similarly, dns workers were holding
  15943. open other sockets, leading to all sorts of chaos.
  15944. - New cleaner daemon() code for forking and backgrounding.
  15945. - If you log to a file, it now prints an entry at the top of the
  15946. logfile so you know it's working.
  15947. - The onionskin challenge length was 30 bytes longer than necessary.
  15948. - Started to patch up the spec so it's not quite so out of date.
  15949. Changes in version 0.0.2pre18 - 2004-01-02
  15950. o Bugfixes:
  15951. - Fix endian issues with the 'integrity' field in the relay header.
  15952. - Fix a potential bug where connections in state
  15953. AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
  15954. Changes in version 0.0.2pre17 - 2003-12-30
  15955. o Bugfixes:
  15956. - Made --debuglogfile (or any second log file, actually) work.
  15957. - Resolved an edge case in get_unique_circ_id_by_conn where a smart
  15958. adversary could force us into an infinite loop.
  15959. o Features:
  15960. - Each onionskin handshake now includes a hash of the computed key,
  15961. to prove the server's identity and help perfect forward secrecy.
  15962. - Changed cell size from 256 to 512 bytes (working toward compatibility
  15963. with MorphMix).
  15964. - Changed cell length to 2 bytes, and moved it to the relay header.
  15965. - Implemented end-to-end integrity checking for the payloads of
  15966. relay cells.
  15967. - Separated streamid from 'recognized' (otherwise circuits will get
  15968. messed up when we try to have streams exit from the middle). We
  15969. use the integrity-checking to confirm that a cell is addressed to
  15970. this hop.
  15971. - Randomize the initial circid and streamid values, so an adversary who
  15972. breaks into a node can't learn how many circuits or streams have
  15973. been made so far.
  15974. Changes in version 0.0.2pre16 - 2003-12-14
  15975. o Bugfixes:
  15976. - Fixed a bug that made HUP trigger an assert
  15977. - Fixed a bug where a circuit that immediately failed wasn't being
  15978. counted as a failed circuit in counting retries.
  15979. o Features:
  15980. - Now we close the circuit when we get a truncated cell: otherwise we're
  15981. open to an anonymity attack where a bad node in the path truncates
  15982. the circuit and then we open streams at him.
  15983. - Add port ranges to exit policies
  15984. - Add a conservative default exit policy
  15985. - Warn if you're running tor as root
  15986. - on HUP, retry OR connections and close/rebind listeners
  15987. - options.EntryNodes: try these nodes first when picking the first node
  15988. - options.ExitNodes: if your best choices happen to include any of
  15989. your preferred exit nodes, you choose among just those preferred
  15990. exit nodes.
  15991. - options.ExcludedNodes: nodes that are never picked in path building
  15992. Changes in version 0.0.2pre15 - 2003-12-03
  15993. o Robustness and bugfixes:
  15994. - Sometimes clients would cache incorrect DNS resolves, which would
  15995. really screw things up.
  15996. - An OP that goes offline would slowly leak all its sockets and stop
  15997. working.
  15998. - A wide variety of bugfixes in exit node selection, exit policy
  15999. handling, and processing pending streams when a new circuit is
  16000. established.
  16001. - Pick nodes for a path only from those the directory says are up
  16002. - Choose randomly from all running dirservers, not always the first one
  16003. - Increase allowed http header size for directory fetch.
  16004. - Stop writing to stderr (if we're daemonized it will be closed).
  16005. - Enable -g always, so cores will be more useful to me.
  16006. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
  16007. o Documentation:
  16008. - Wrote a man page. It lists commonly used options.
  16009. o Configuration:
  16010. - Change default loglevel to warn.
  16011. - Make PidFile default to null rather than littering in your CWD.
  16012. - OnionRouter config option is now obsolete. Instead it just checks
  16013. ORPort>0.
  16014. - Moved to a single unified torrc file for both clients and servers.
  16015. Changes in version 0.0.2pre14 - 2003-11-29
  16016. o Robustness and bugfixes:
  16017. - Force the admin to make the DataDirectory himself
  16018. - to get ownership/permissions right
  16019. - so clients no longer make a DataDirectory and then never use it
  16020. - fix bug where a client who was offline for 45 minutes would never
  16021. pull down a directory again
  16022. - fix (or at least hide really well) the dns assert bug that was
  16023. causing server crashes
  16024. - warnings and improved robustness wrt clockskew for certs
  16025. - use the native daemon(3) to daemonize, when available
  16026. - exit if bind() fails
  16027. - exit if neither socksport nor orport is defined
  16028. - include our own tor_timegm (Win32 doesn't have its own)
  16029. - bugfix for win32 with lots of connections
  16030. - fix minor bias in PRNG
  16031. - make dirserver more robust to corrupt cached directory
  16032. o Documentation:
  16033. - Wrote the design document (woo)
  16034. o Circuit building and exit policies:
  16035. - Circuits no longer try to use nodes that the directory has told them
  16036. are down.
  16037. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
  16038. bitcounts (18.0.0.0/8).
  16039. - Make AP connections standby for a circuit if no suitable circuit
  16040. exists, rather than failing
  16041. - Circuits choose exit node based on addr/port, exit policies, and
  16042. which AP connections are standing by
  16043. - Bump min pathlen from 2 to 3
  16044. - Relay end cells have a payload to describe why the stream ended.
  16045. - If the stream failed because of exit policy, try again with a new
  16046. circuit.
  16047. - Clients have a dns cache to remember resolved addresses.
  16048. - Notice more quickly when we have no working circuits
  16049. o Configuration:
  16050. - APPort is now called SocksPort
  16051. - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
  16052. where to bind
  16053. - RecommendedVersions is now a config variable rather than
  16054. hardcoded (for dirservers)
  16055. - Reloads config on HUP
  16056. - Usage info on -h or --help
  16057. - If you set User and Group config vars, it'll setu/gid to them.
  16058. Changes in version 0.0.2pre13 - 2003-10-19
  16059. o General stability:
  16060. - SSL_write no longer fails when it returns WANTWRITE and the number
  16061. of bytes in the buf has changed by the next SSL_write call.
  16062. - Fix segfault fetching directory when network is down
  16063. - Fix a variety of minor memory leaks
  16064. - Dirservers reload the fingerprints file on HUP, so I don't have
  16065. to take down the network when I approve a new router
  16066. - Default server config file has explicit Address line to specify fqdn
  16067. o Buffers:
  16068. - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
  16069. - Make listener connections not ever alloc bufs
  16070. o Autoconf improvements:
  16071. - don't clobber an external CFLAGS in ./configure
  16072. - Make install now works
  16073. - create var/lib/tor on make install
  16074. - autocreate a tor.sh initscript to help distribs
  16075. - autocreate the torrc and sample-server-torrc with correct paths
  16076. o Log files and Daemonizing now work:
  16077. - If --DebugLogFile is specified, log to it at -l debug
  16078. - If --LogFile is specified, use it instead of commandline
  16079. - If --RunAsDaemon is set, tor forks and backgrounds on startup