ReleaseNotes 627 KB

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  1. This document summarizes new features and bugfixes in each stable release
  2. of Tor. If you want to see more detailed descriptions of the changes in
  3. each development snapshot, see the ChangeLog file.
  4. Changes in version 0.2.6.8 - 2015-05-21
  5. Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
  6. fixes an authority-side bug in assigning the HSDir flag. All directory
  7. authorities should upgrade.
  8. o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
  9. - Revert commit that made directory authorities assign the HSDir
  10. flag to relay without a DirPort; this was bad because such relays
  11. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  12. on tor-0.2.6.3-alpha.
  13. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  14. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  15. a client authorized hidden service. Fixes bug 15823; bugfix
  16. on 0.2.1.6-alpha.
  17. o Minor features (geoip):
  18. - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
  19. - Update geoip6 to the April 8 2015 Maxmind GeoLite2
  20. Country database.
  21. Changes in version 0.2.6.7 - 2015-04-06
  22. Tor 0.2.6.7 fixes two security issues that could be used by an
  23. attacker to crash hidden services, or crash clients visiting hidden
  24. services. Hidden services should upgrade as soon as possible; clients
  25. should upgrade whenever packages become available.
  26. This release also contains two simple improvements to make hidden
  27. services a bit less vulnerable to denial-of-service attacks.
  28. o Major bugfixes (security, hidden service):
  29. - Fix an issue that would allow a malicious client to trigger an
  30. assertion failure and halt a hidden service. Fixes bug 15600;
  31. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  32. - Fix a bug that could cause a client to crash with an assertion
  33. failure when parsing a malformed hidden service descriptor. Fixes
  34. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  35. o Minor features (DoS-resistance, hidden service):
  36. - Introduction points no longer allow multiple INTRODUCE1 cells to
  37. arrive on the same circuit. This should make it more expensive for
  38. attackers to overwhelm hidden services with introductions.
  39. Resolves ticket 15515.
  40. - Decrease the amount of reattempts that a hidden service performs
  41. when its rendezvous circuits fail. This reduces the computational
  42. cost for running a hidden service under heavy load. Resolves
  43. ticket 11447.
  44. Changes in version 0.2.5.12 - 2015-04-06
  45. Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
  46. could be used by an attacker to crash hidden services, or crash clients
  47. visiting hidden services. Hidden services should upgrade as soon as
  48. possible; clients should upgrade whenever packages become available.
  49. This release also backports a simple improvement to make hidden
  50. services a bit less vulnerable to denial-of-service attacks.
  51. o Major bugfixes (security, hidden service):
  52. - Fix an issue that would allow a malicious client to trigger an
  53. assertion failure and halt a hidden service. Fixes bug 15600;
  54. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  55. - Fix a bug that could cause a client to crash with an assertion
  56. failure when parsing a malformed hidden service descriptor. Fixes
  57. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  58. o Minor features (DoS-resistance, hidden service):
  59. - Introduction points no longer allow multiple INTRODUCE1 cells to
  60. arrive on the same circuit. This should make it more expensive for
  61. attackers to overwhelm hidden services with introductions.
  62. Resolves ticket 15515.
  63. Changes in version 0.2.4.27 - 2015-04-06
  64. Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
  65. could be used by an attacker to crash hidden services, or crash clients
  66. visiting hidden services. Hidden services should upgrade as soon as
  67. possible; clients should upgrade whenever packages become available.
  68. This release also backports a simple improvement to make hidden
  69. services a bit less vulnerable to denial-of-service attacks.
  70. o Major bugfixes (security, hidden service):
  71. - Fix an issue that would allow a malicious client to trigger an
  72. assertion failure and halt a hidden service. Fixes bug 15600;
  73. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  74. - Fix a bug that could cause a client to crash with an assertion
  75. failure when parsing a malformed hidden service descriptor. Fixes
  76. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  77. o Minor features (DoS-resistance, hidden service):
  78. - Introduction points no longer allow multiple INTRODUCE1 cells to
  79. arrive on the same circuit. This should make it more expensive for
  80. attackers to overwhelm hidden services with introductions.
  81. Resolves ticket 15515.
  82. Changes in version 0.2.6.6 - 2015-03-24
  83. Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
  84. It adds numerous safety, security, correctness, and performance
  85. improvements. Client programs can be configured to use more kinds of
  86. sockets, AutomapHosts works better, the multithreading backend is
  87. improved, cell transmission is refactored, test coverage is much
  88. higher, more denial-of-service attacks are handled, guard selection is
  89. improved to handle long-term guards better, pluggable transports
  90. should work a bit better, and some annoying hidden service performance
  91. bugs should be addressed.
  92. o New compiler and system requirements:
  93. - Tor 0.2.6.x requires that your compiler support more of the C99
  94. language standard than before. The 'configure' script now detects
  95. whether your compiler supports C99 mid-block declarations and
  96. designated initializers. If it does not, Tor will not compile.
  97. We may revisit this requirement if it turns out that a significant
  98. number of people need to build Tor with compilers that don't
  99. bother implementing a 15-year-old standard. Closes ticket 13233.
  100. - Tor no longer supports systems without threading support. When we
  101. began working on Tor, there were several systems that didn't have
  102. threads, or where the thread support wasn't able to run the
  103. threads of a single process on multiple CPUs. That no longer
  104. holds: every system where Tor needs to run well now has threading
  105. support. Resolves ticket 12439.
  106. o Deprecated versions and removed support:
  107. - Tor relays older than 0.2.4.18-rc are no longer allowed to
  108. advertise themselves on the network. Closes ticket 13555.
  109. - Tor clients no longer support connecting to hidden services
  110. running on Tor 0.2.2.x and earlier; the Support022HiddenServices
  111. option has been removed. (There shouldn't be any hidden services
  112. running these versions on the network.) Closes ticket 7803.
  113. o Directory authority changes:
  114. - The directory authority Faravahar has a new IP address. This
  115. closes ticket 14487.
  116. - Remove turtles as a directory authority.
  117. - Add longclaw as a new (v3) directory authority. This implements
  118. ticket 13296. This keeps the directory authority count at 9.
  119. o Major features (bridges):
  120. - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
  121. transports if they are configured via the "TOR_PT_PROXY"
  122. environment variable. Implements proposal 232. Resolves
  123. ticket 8402.
  124. o Major features (changed defaults):
  125. - Prevent relay operators from unintentionally running exits: When a
  126. relay is configured as an exit node, we now warn the user unless
  127. the "ExitRelay" option is set to 1. We warn even more loudly if
  128. the relay is configured with the default exit policy, since this
  129. can indicate accidental misconfiguration. Setting "ExitRelay 0"
  130. stops Tor from running as an exit relay. Closes ticket 10067.
  131. o Major features (client performance, hidden services):
  132. - Allow clients to use optimistic data when connecting to a hidden
  133. service, which should remove a round-trip from hidden service
  134. initialization. See proposal 181 for details. Implements
  135. ticket 13211.
  136. o Major features (directory system):
  137. - Upon receiving an unparseable directory object, if its digest
  138. matches what we expected, then don't try to download it again.
  139. Previously, when we got a descriptor we didn't like, we would keep
  140. trying to download it over and over. Closes ticket 11243.
  141. - When downloading server- or microdescriptors from a directory
  142. server, we no longer launch multiple simultaneous requests to the
  143. same server. This reduces load on the directory servers,
  144. especially when directory guards are in use. Closes ticket 9969.
  145. - When downloading server- or microdescriptors over a tunneled
  146. connection, do not limit the length of our requests to what the
  147. Squid proxy is willing to handle. Part of ticket 9969.
  148. - Authorities can now vote on the correct digests and latest
  149. versions for different software packages. This allows packages
  150. that include Tor to use the Tor authority system as a way to get
  151. notified of updates and their correct digests. Implements proposal
  152. 227. Closes ticket 10395.
  153. o Major features (guards):
  154. - Introduce the Guardfraction feature to improves load balancing on
  155. guard nodes. Specifically, it aims to reduce the traffic gap that
  156. guard nodes experience when they first get the Guard flag. This is
  157. a required step if we want to increase the guard lifetime to 9
  158. months or greater. Closes ticket 9321.
  159. o Major features (hidden services):
  160. - Make HS port scanning more difficult by immediately closing the
  161. circuit when a user attempts to connect to a nonexistent port.
  162. Closes ticket 13667.
  163. - Add a HiddenServiceStatistics option that allows Tor relays to
  164. gather and publish statistics about the overall size and volume of
  165. hidden service usage. Specifically, when this option is turned on,
  166. an HSDir will publish an approximate number of hidden services
  167. that have published descriptors to it the past 24 hours. Also, if
  168. a relay has acted as a hidden service rendezvous point, it will
  169. publish the approximate amount of rendezvous cells it has relayed
  170. the past 24 hours. The statistics themselves are obfuscated so
  171. that the exact values cannot be derived. For more details see
  172. proposal 238, "Better hidden service stats from Tor relays". This
  173. feature is currently disabled by default. Implements feature 13192.
  174. o Major features (performance):
  175. - Make the CPU worker implementation more efficient by avoiding the
  176. kernel and lengthening pipelines. The original implementation used
  177. sockets to transfer data from the main thread to the workers, and
  178. didn't allow any thread to be assigned more than a single piece of
  179. work at once. The new implementation avoids communications
  180. overhead by making requests in shared memory, avoiding kernel IO
  181. where possible, and keeping more requests in flight at once.
  182. Implements ticket 9682.
  183. o Major features (relay):
  184. - Raise the minimum acceptable configured bandwidth rate for bridges
  185. to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
  186. 20 KiB/sec.) Closes ticket 13822.
  187. - Complete revision of the code that relays use to decide which cell
  188. to send next. Formerly, we selected the best circuit to write on
  189. each channel, but we didn't select among channels in any
  190. sophisticated way. Now, we choose the best circuits globally from
  191. among those whose channels are ready to deliver traffic.
  192. This patch implements a new inter-cmux comparison API, a global
  193. high/low watermark mechanism and a global scheduler loop for
  194. transmission prioritization across all channels as well as among
  195. circuits on one channel. This schedule is currently tuned to
  196. (tolerantly) avoid making changes in network performance, but it
  197. should form the basis for major circuit performance increases in
  198. the future. Code by Andrea; tuning by Rob Jansen; implements
  199. ticket 9262.
  200. o Major features (sample torrc):
  201. - Add a new, infrequently-changed "torrc.minimal". This file is
  202. similar to torrc.sample, but it will change as infrequently as
  203. possible, for the benefit of users whose systems prompt them for
  204. intervention whenever a default configuration file is changed.
  205. Making this change allows us to update torrc.sample to be a more
  206. generally useful "sample torrc".
  207. o Major features (security, unix domain sockets):
  208. - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
  209. applications can reach Tor without having to create AF_INET or
  210. AF_INET6 sockets, meaning they can completely disable their
  211. ability to make non-Tor network connections. To create a socket of
  212. this type, use "SocksPort unix:/path/to/socket". Implements
  213. ticket 12585.
  214. - Support mapping hidden service virtual ports to AF_UNIX sockets.
  215. The syntax is "HiddenServicePort 80 unix:/path/to/socket".
  216. Implements ticket 11485.
  217. o Major bugfixes (client, automap):
  218. - Repair automapping with IPv6 addresses. This automapping should
  219. have worked previously, but one piece of debugging code that we
  220. inserted to detect a regression actually caused the regression to
  221. manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
  222. 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
  223. Izquierdo Riera.
  224. o Major bugfixes (crash, OSX, security):
  225. - Fix a remote denial-of-service opportunity caused by a bug in
  226. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  227. in OSX 10.9.
  228. o Major bugfixes (directory authorities):
  229. - Do not assign the HSDir flag to relays if they are not Valid, or
  230. currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
  231. o Major bugfixes (directory bandwidth performance):
  232. - Don't flush the zlib buffer aggressively when compressing
  233. directory information for clients. This should save about 7% of
  234. the bandwidth currently used for compressed descriptors and
  235. microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
  236. o Major bugfixes (exit node stability):
  237. - Fix an assertion failure that could occur under high DNS load.
  238. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  239. diagnosed and fixed by "cypherpunks".
  240. o Major bugfixes (FreeBSD IPFW transparent proxy):
  241. - Fix address detection with FreeBSD transparent proxies, when
  242. "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
  243. on 0.2.5.4-alpha.
  244. o Major bugfixes (hidden services):
  245. - When closing an introduction circuit that was opened in parallel
  246. with others, don't mark the introduction point as unreachable.
  247. Previously, the first successful connection to an introduction
  248. point would make the other introduction points get marked as
  249. having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
  250. o Major bugfixes (Linux seccomp2 sandbox):
  251. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  252. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  253. 0.2.5.1-alpha. Patch from "sanic".
  254. o Major bugfixes (mixed relay-client operation):
  255. - When running as a relay and client at the same time (not
  256. recommended), if we decide not to use a new guard because we want
  257. to retry older guards, only close the locally-originating circuits
  258. passing through that guard. Previously we would close all the
  259. circuits through that guard. Fixes bug 9819; bugfix on
  260. 0.2.1.1-alpha. Reported by "skruffy".
  261. o Major bugfixes (pluggable transports):
  262. - Initialize the extended OR Port authentication cookie before
  263. launching pluggable transports. This prevents a race condition
  264. that occured when server-side pluggable transports would cache the
  265. authentication cookie before it has been (re)generated. Fixes bug
  266. 15240; bugfix on 0.2.5.1-alpha.
  267. o Major bugfixes (relay, stability, possible security):
  268. - Fix a bug that could lead to a relay crashing with an assertion
  269. failure if a buffer of exactly the wrong layout is passed to
  270. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  271. 0.2.0.10-alpha. Patch from "cypherpunks".
  272. - Do not assert if the 'data' pointer on a buffer is advanced to the
  273. very end of the buffer; log a BUG message instead. Only assert if
  274. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  275. o Minor features (build):
  276. - New --disable-system-torrc compile-time option to prevent Tor from
  277. looking for the system-wide torrc or torrc-defaults files.
  278. Resolves ticket 13037.
  279. o Minor features (client):
  280. - Clients are now willing to send optimistic data (before they
  281. receive a 'connected' cell) to relays of any version. (Relays
  282. without support for optimistic data are no longer supported on the
  283. Tor network.) Resolves ticket 13153.
  284. o Minor features (client):
  285. - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
  286. is enabled, reject requests with IP addresses as hostnames.
  287. Resolves ticket 13315.
  288. o Minor features (controller):
  289. - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
  290. write an unscheduled heartbeat message to the log. Implements
  291. feature 9503.
  292. - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
  293. events so controllers can observe circuit isolation inputs. Closes
  294. ticket 8405.
  295. - ControlPort now supports the unix:/path/to/socket syntax as an
  296. alternative to the ControlSocket option, for consistency with
  297. SocksPort and HiddenServicePort. Closes ticket 14451.
  298. - New "GETINFO bw-event-cache" to get information about recent
  299. bandwidth events. Closes ticket 14128. Useful for controllers to
  300. get recent bandwidth history after the fix for ticket 13988.
  301. - Messages about problems in the bootstrap process now include
  302. information about the server we were trying to connect to when we
  303. noticed the problem. Closes ticket 15006.
  304. o Minor features (Denial of service resistance):
  305. - Count the total number of bytes used storing hidden service
  306. descriptors against the value of MaxMemInQueues. If we're low on
  307. memory, and more than 20% of our memory is used holding hidden
  308. service descriptors, free them until no more than 10% of our
  309. memory holds hidden service descriptors. Free the least recently
  310. fetched descriptors first. Resolves ticket 13806.
  311. - When we have recently been under memory pressure (over 3/4 of
  312. MaxMemInQueues is allocated), then allocate smaller zlib objects
  313. for small requests. Closes ticket 11791.
  314. o Minor features (directory authorities):
  315. - Don't list relays with a bandwidth estimate of 0 in the consensus.
  316. Implements a feature proposed during discussion of bug 13000.
  317. - In tor-gencert, report an error if the user provides the same
  318. argument more than once.
  319. - If a directory authority can't find a best consensus method in the
  320. votes that it holds, it now falls back to its favorite consensus
  321. method. Previously, it fell back to method 1. Neither of these is
  322. likely to get enough signatures, but "fall back to favorite"
  323. doesn't require us to maintain support an obsolete consensus
  324. method. Implements part of proposal 215.
  325. o Minor features (geoip):
  326. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  327. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  328. Country database.
  329. o Minor features (guard nodes):
  330. - Reduce the time delay before saving guard status to disk from 10
  331. minutes to 30 seconds (or from one hour to 10 minutes if
  332. AvoidDiskWrites is set). Closes ticket 12485.
  333. o Minor features (heartbeat):
  334. - On relays, report how many connections we negotiated using each
  335. version of the Tor link protocols. This information will let us
  336. know if removing support for very old versions of the Tor
  337. protocols is harming the network. Closes ticket 15212.
  338. o Minor features (hidden service):
  339. - Make Sybil attacks against hidden services harder by changing the
  340. minimum time required to get the HSDir flag from 25 hours up to 96
  341. hours. Addresses ticket 14149.
  342. - New option "HiddenServiceAllowUnknownPorts" to allow hidden
  343. services to disable the anti-scanning feature introduced in
  344. 0.2.6.2-alpha. With this option not set, a connection to an
  345. unlisted port closes the circuit. With this option set, only a
  346. RELAY_DONE cell is sent. Closes ticket 14084.
  347. - When re-enabling the network, don't try to build introduction
  348. circuits until we have successfully built a circuit. This makes
  349. hidden services come up faster when the network is re-enabled.
  350. Patch from "akwizgran". Closes ticket 13447.
  351. - When we fail to retrieve a hidden service descriptor, send the
  352. controller an "HS_DESC FAILED" controller event. Implements
  353. feature 13212.
  354. - New HiddenServiceDirGroupReadable option to cause hidden service
  355. directories and hostname files to be created group-readable. Patch
  356. from "anon", David Stainton, and "meejah". Closes ticket 11291.
  357. o Minor features (interface):
  358. - Implement "-f -" command-line option to read torrc configuration
  359. from standard input, if you don't want to store the torrc file in
  360. the file system. Implements feature 13865.
  361. o Minor features (logging):
  362. - Add a count of unique clients to the bridge heartbeat message.
  363. Resolves ticket 6852.
  364. - Suppress "router info incompatible with extra info" message when
  365. reading extrainfo documents from cache. (This message got loud
  366. around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
  367. ticket 13762.
  368. - Elevate hidden service authorized-client message from DEBUG to
  369. INFO. Closes ticket 14015.
  370. - On Unix-like systems, you can now use named pipes as the target of
  371. the Log option, and other options that try to append to files.
  372. Closes ticket 12061. Patch from "carlo von lynX".
  373. - When opening a log file at startup, send it every log message that
  374. we generated between startup and opening it. Previously, log
  375. messages that were generated before opening the log file were only
  376. logged to stdout. Closes ticket 6938.
  377. - Add a TruncateLogFile option to overwrite logs instead of
  378. appending to them. Closes ticket 5583.
  379. - Quiet some log messages in the heartbeat and at startup. Closes
  380. ticket 14950.
  381. o Minor features (portability, Solaris):
  382. - Threads are no longer disabled by default on Solaris; we believe
  383. that the versions of Solaris with broken threading support are all
  384. obsolete by now. Resolves ticket 9495.
  385. o Minor features (relay):
  386. - Re-check our address after we detect a changed IP address from
  387. getsockname(). This ensures that the controller command "GETINFO
  388. address" will report the correct value. Resolves ticket 11582.
  389. Patch from "ra".
  390. - A new AccountingRule option lets Relays set whether they'd like
  391. AccountingMax to be applied separately to inbound and outbound
  392. traffic, or applied to the sum of inbound and outbound traffic.
  393. Resolves ticket 961. Patch by "chobe".
  394. - When identity keypair is generated for first time, log a
  395. congratulatory message that links to the new relay lifecycle
  396. document. Implements feature 10427.
  397. o Minor features (security, memory wiping):
  398. - Ensure we securely wipe keys from memory after
  399. crypto_digest_get_digest and init_curve25519_keypair_from_file
  400. have finished using them. Resolves ticket 13477.
  401. o Minor features (security, out-of-memory handling):
  402. - When handling an out-of-memory condition, allocate less memory for
  403. temporary data structures. Fixes issue 10115.
  404. - When handling an out-of-memory condition, consider more types of
  405. buffers, including those on directory connections, and zlib
  406. buffers. Resolves ticket 11792.
  407. o Minor features (stability):
  408. - Add assertions in our hash-table iteration code to check for
  409. corrupted values that could cause infinite loops. Closes
  410. ticket 11737.
  411. o Minor features (systemd):
  412. - Various improvements and modernizations in systemd hardening
  413. support. Closes ticket 13805. Patch from Craig Andrews.
  414. - Where supported, when running with systemd, report successful
  415. startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
  416. - When running with systemd, support systemd watchdog messages. Part
  417. of ticket 11016. Patch by Michael Scherer.
  418. o Minor features (testing networks):
  419. - Add the TestingDirAuthVoteExit option, which lists nodes to assign
  420. the "Exit" flag regardless of their uptime, bandwidth, or exit
  421. policy. TestingTorNetwork must be set for this option to have any
  422. effect. Previously, authorities would take up to 35 minutes to
  423. give nodes the Exit flag in a test network. Partially implements
  424. ticket 13161.
  425. - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
  426. and the default on a testing network to 2 minutes. Drop the
  427. MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
  428. keep the default on a testing network at 30 seconds. This reduces
  429. HS bootstrap time to around 25 seconds. Also, change the default
  430. time in test-network.sh to match. Closes ticket 13401. Patch
  431. by "teor".
  432. - Create TestingDirAuthVoteHSDir to correspond to
  433. TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
  434. HSDir flag for the listed relays regardless of uptime or ORPort
  435. connectivity. Respects the value of VoteOnHidServDirectoriesV2.
  436. Partial implementation for ticket 14067. Patch by "teor".
  437. o Minor features (tor2web mode):
  438. - Introduce the config option Tor2webRendezvousPoints, which allows
  439. clients in Tor2webMode to select a specific Rendezvous Point to be
  440. used in HS circuits. This might allow better performance for
  441. Tor2Web nodes. Implements ticket 12844.
  442. o Minor features (transparent proxy):
  443. - Update the transparent proxy option checks to allow for both ipfw
  444. and pf on OS X. Closes ticket 14002.
  445. - Use the correct option when using IPv6 with transparent proxy
  446. support on Linux. Resolves 13808. Patch by Francisco Blas
  447. Izquierdo Riera.
  448. o Minor features (validation):
  449. - Check all date/time values passed to tor_timegm and
  450. parse_rfc1123_time for validity, taking leap years into account.
  451. Improves HTTP header validation. Implemented with bug 13476.
  452. - In correct_tm(), limit the range of values returned by system
  453. localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
  454. This means we don't have to deal with negative or too large dates,
  455. even if a clock is wrong. Otherwise we might fail to read a file
  456. written by us which includes such a date. Fixes bug 13476.
  457. - Stop allowing invalid address patterns like "*/24" that contain
  458. both a wildcard address and a bit prefix length. This affects all
  459. our address-range parsing code. Fixes bug 7484; bugfix
  460. on 0.0.2pre14.
  461. o Minor bugfixes (bridge clients):
  462. - When configured to use a bridge without an identity digest (not
  463. recommended), avoid launching an extra channel to it when
  464. bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
  465. o Minor bugfixes (bridges):
  466. - When DisableNetwork is set, do not launch pluggable transport
  467. plugins, and if any are running, terminate them. Fixes bug 13213;
  468. bugfix on 0.2.3.6-alpha.
  469. o Minor bugfixes (C correctness):
  470. - Fix several instances of possible integer overflow/underflow/NaN.
  471. Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
  472. from "teor".
  473. - In circuit_build_times_calculate_timeout() in circuitstats.c,
  474. avoid dividing by zero in the pareto calculations. This traps
  475. under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
  476. on 0.2.2.2-alpha.
  477. - Fix an integer overflow in format_time_interval(). Fixes bug
  478. 13393; bugfix on 0.2.0.10-alpha.
  479. - Set the correct day of year value when the system's localtime(_r)
  480. or gmtime(_r) functions fail to set struct tm. Not externally
  481. visible. Fixes bug 13476; bugfix on 0.0.2pre14.
  482. - Avoid unlikely signed integer overflow in tor_timegm on systems
  483. with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
  484. o Minor bugfixes (certificate handling):
  485. - If an authority operator accidentally makes a signing certificate
  486. with a future publication time, do not discard its real signing
  487. certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
  488. - Remove any old authority certificates that have been superseded
  489. for at least two days. Previously, we would keep superseded
  490. certificates until they expired, if they were published close in
  491. time to the certificate that superseded them. Fixes bug 11454;
  492. bugfix on 0.2.1.8-alpha.
  493. o Minor bugfixes (client):
  494. - Fix smartlist_choose_node_by_bandwidth() so that relays with the
  495. BadExit flag are not considered worthy candidates. Fixes bug
  496. 13066; bugfix on 0.1.2.3-alpha.
  497. - Use the consensus schedule for downloading consensuses, and not
  498. the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
  499. - Handle unsupported or malformed SOCKS5 requests properly by
  500. responding with the appropriate error message before closing the
  501. connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
  502. o Minor bugfixes (client, automapping):
  503. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  504. no value follows the option. Fixes bug 14142; bugfix on
  505. 0.2.4.7-alpha. Patch by "teor".
  506. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  507. 14195; bugfix on 0.1.0.1-rc.
  508. - Prevent changes to other options from removing the wildcard value
  509. "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
  510. on 0.2.0.1-alpha.
  511. - Allow MapAddress and AutomapHostsOnResolve to work together when
  512. an address is mapped into another address type (like .onion) that
  513. must be automapped at resolve time. Fixes bug 7555; bugfix
  514. on 0.2.0.1-alpha.
  515. o Minor bugfixes (client, bridges):
  516. - When we are using bridges and we had a network connectivity
  517. problem, only retry connecting to our currently configured
  518. bridges, not all bridges we know about and remember using. Fixes
  519. bug 14216; bugfix on 0.2.2.17-alpha.
  520. o Minor bugfixes (client, DNS):
  521. - Report the correct cached DNS expiration times on SOCKS port or in
  522. DNS replies. Previously, we would report everything as "never
  523. expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
  524. - Avoid a small memory leak when we find a cached answer for a
  525. reverse DNS lookup in a client-side DNS cache. (Remember, client-
  526. side DNS caching is off by default, and is not recommended.) Fixes
  527. bug 14259; bugfix on 0.2.0.1-alpha.
  528. o Minor bugfixes (client, IPv6):
  529. - Reject socks requests to literal IPv6 addresses when IPv6Traffic
  530. flag is not set; and not because the NoIPv4Traffic flag was set.
  531. Previously we'd looked at the NoIPv4Traffic flag for both types of
  532. literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
  533. o Minor bugfixes (client, microdescriptors):
  534. - Use a full 256 bits of the SHA256 digest of a microdescriptor when
  535. computing which microdescriptors to download. This keeps us from
  536. erroneous download behavior if two microdescriptor digests ever
  537. have the same first 160 bits. Fixes part of bug 13399; bugfix
  538. on 0.2.3.1-alpha.
  539. - Reset a router's status if its microdescriptor digest changes,
  540. even if the first 160 bits remain the same. Fixes part of bug
  541. 13399; bugfix on 0.2.3.1-alpha.
  542. o Minor bugfixes (client, torrc):
  543. - Stop modifying the value of our DirReqStatistics torrc option just
  544. because we're not a bridge or relay. This bug was causing Tor
  545. Browser users to write "DirReqStatistics 0" in their torrc files
  546. as if they had chosen to change the config. Fixes bug 4244; bugfix
  547. on 0.2.3.1-alpha.
  548. - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
  549. that our options have changed every time we SIGHUP. Fixes bug
  550. 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
  551. o Minor bugfixes (compilation):
  552. - Fix a compilation warning on s390. Fixes bug 14988; bugfix
  553. on 0.2.5.2-alpha.
  554. - Silence clang warnings under --enable-expensive-hardening,
  555. including implicit truncation of 64 bit values to 32 bit, const
  556. char assignment to self, tautological compare, and additional
  557. parentheses around equality tests. Fixes bug 13577; bugfix
  558. on 0.2.5.4-alpha.
  559. - Fix a clang warning about checking whether an address in the
  560. middle of a structure is NULL. Fixes bug 14001; bugfix
  561. on 0.2.1.2-alpha.
  562. - The address of an array in the middle of a structure will always
  563. be non-NULL. clang recognises this and complains. Disable the
  564. tautologous and redundant check to silence this warning. Fixes bug
  565. 14001; bugfix on 0.2.1.2-alpha.
  566. - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
  567. Addresses ticket 14188.
  568. - Build without warnings with the stock OpenSSL srtp.h header, which
  569. has a duplicate declaration of SSL_get_selected_srtp_profile().
  570. Fixes bug 14220; this is OpenSSL's bug, not ours.
  571. - Do not compile any code related to Tor2Web mode when Tor2Web mode
  572. is not enabled at compile time. Previously, this code was included
  573. in a disabled state. See discussion on ticket 12844.
  574. - Allow our configure script to build correctly with autoconf 2.62
  575. again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
  576. - Improve the error message from ./configure to make it clear that
  577. when asciidoc has not been found, the user will have to either add
  578. --disable-asciidoc argument or install asciidoc. Resolves
  579. ticket 13228.
  580. o Minor bugfixes (controller):
  581. - Report "down" in response to the "GETINFO entry-guards" command
  582. when relays are down with an unreachable_since value. Previously,
  583. we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
  584. - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
  585. 14116; bugfix on 0.2.2.9-alpha.
  586. o Minor bugfixes (controller):
  587. - Return an error when the second or later arguments of the
  588. "setevents" controller command are invalid events. Previously we
  589. would return success while silently skipping invalid events. Fixes
  590. bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
  591. o Minor bugfixes (directory authority):
  592. - Allow directory authorities to fetch more data from one another if
  593. they find themselves missing lots of votes. Previously, they had
  594. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  595. bugfix on 0.1.2.5-alpha.
  596. - Do not attempt to download extrainfo documents which we will be
  597. unable to validate with a matching server descriptor. Fixes bug
  598. 13762; bugfix on 0.2.0.1-alpha.
  599. - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
  600. control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
  601. - Enlarge the buffer to read bwauth generated files to avoid an
  602. issue when parsing the file in dirserv_read_measured_bandwidths().
  603. Fixes bug 14125; bugfix on 0.2.2.1-alpha.
  604. - When running as a v3 directory authority, advertise that you serve
  605. extra-info documents so that clients who want them can find them
  606. from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  607. o Minor bugfixes (directory system):
  608. - Always believe that v3 directory authorities serve extra-info
  609. documents, whether they advertise "caches-extra-info" or not.
  610. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  611. - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
  612. Previously, directories offering BRIDGE_DIRINFO and some other
  613. flag (i.e. microdescriptors or extrainfo) would be ignored when
  614. looking for bridges. Partially fixes bug 13163; bugfix
  615. on 0.2.0.7-alpha.
  616. o Minor bugfixes (file handling):
  617. - Stop failing when key files are zero-length. Instead, generate new
  618. keys, and overwrite the empty key files. Fixes bug 13111; bugfix
  619. on all versions of Tor. Patch by "teor".
  620. - Stop generating a fresh .old RSA onion key file when the .old file
  621. is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
  622. - Avoid overwriting .old key files with empty key files.
  623. - Skip loading zero-length extrainfo store, router store, stats,
  624. state, and key files.
  625. - Avoid crashing when trying to reload a torrc specified as a
  626. relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
  627. on 0.2.3.11-alpha.
  628. o Minor bugfixes (hidden services):
  629. - Close the introduction circuit when we have no more usable intro
  630. points, instead of waiting for it to time out. This also ensures
  631. that no follow-up HS descriptor fetch is triggered when the
  632. circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
  633. - When fetching a hidden service descriptor for a down service that
  634. was recently up, do not keep refetching until we try the same
  635. replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
  636. - Correctly send a controller event when we find that a rendezvous
  637. circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
  638. - Pre-check directory permissions for new hidden-services to avoid
  639. at least one case of "Bug: Acting on config options left us in a
  640. broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
  641. - When fetching hidden service descriptors, we now check not only
  642. for whether we got the hidden service we had in mind, but also
  643. whether we got the particular descriptors we wanted. This prevents
  644. a class of inefficient but annoying DoS attacks by hidden service
  645. directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
  646. by "special".
  647. o Minor bugfixes (Linux seccomp2 sandbox):
  648. - Make transparent proxy support work along with the seccomp2
  649. sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
  650. by Francisco Blas Izquierdo Riera.
  651. - Fix a memory leak in tor-resolve when running with the sandbox
  652. enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
  653. - Allow glibc fatal errors to be sent to stderr before Tor exits.
  654. Previously, glibc would try to write them to /dev/tty, and the
  655. sandbox would trap the call and make Tor exit prematurely. Fixes
  656. bug 14759; bugfix on 0.2.5.1-alpha.
  657. o Minor bugfixes (logging):
  658. - Avoid crashing when there are more log domains than entries in
  659. domain_list. Bugfix on 0.2.3.1-alpha.
  660. - Downgrade warnings about RSA signature failures to info log level.
  661. Emit a warning when an extra info document is found incompatible
  662. with a corresponding router descriptor. Fixes bug 9812; bugfix
  663. on 0.0.6rc3.
  664. - Make connection_ap_handshake_attach_circuit() log the circuit ID
  665. correctly. Fixes bug 13701; bugfix on 0.0.6.
  666. o Minor bugfixes (networking):
  667. - Check for orconns and use connection_or_close_for_error() rather
  668. than connection_mark_for_close() directly in the getsockopt()
  669. failure case of connection_handle_write_impl(). Fixes bug 11302;
  670. bugfix on 0.2.4.4-alpha.
  671. o Minor bugfixes (parsing):
  672. - Stop accepting milliseconds (or other junk) at the end of
  673. descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
  674. - Support two-number and three-number version numbers correctly, in
  675. case we change the Tor versioning system in the future. Fixes bug
  676. 13661; bugfix on 0.0.8pre1.
  677. o Minor bugfixes (portability):
  678. - Fix the ioctl()-based network interface lookup code so that it
  679. will work on systems that have variable-length struct ifreq, for
  680. example Mac OS X.
  681. - Use the correct datatype in the SipHash-2-4 function to prevent
  682. compilers from assuming any sort of alignment. Fixes bug 15436;
  683. bugfix on 0.2.5.3-alpha.
  684. o Minor bugfixes (preventative security, C safety):
  685. - When reading a hexadecimal, base-32, or base-64 encoded value from
  686. a string, always overwrite the whole output buffer. This prevents
  687. some bugs where we would look at (but fortunately, not reveal)
  688. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  689. versions of Tor.
  690. - Clear all memory targetted by tor_addr_{to,from}_sockaddr(), not
  691. just the part that's used. This makes it harder for data leak bugs
  692. to occur in the event of other programming failures. Resolves
  693. ticket 14041.
  694. o Minor bugfixes (relay):
  695. - When generating our family list, remove spaces from around the
  696. entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
  697. - If our previous bandwidth estimate was 0 bytes, allow publishing a
  698. new relay descriptor immediately. Fixes bug 13000; bugfix
  699. on 0.1.1.6-alpha.
  700. o Minor bugfixes (shutdown):
  701. - When shutting down, always call event_del() on lingering read or
  702. write events before freeing them. Otherwise, we risk double-frees
  703. or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
  704. on 0.1.0.2-rc.
  705. o Minor bugfixes (small memory leaks):
  706. - Avoid leaking memory when using IPv6 virtual address mappings.
  707. Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
  708. der Woerdt.
  709. o Minor bugfixes (statistics):
  710. - Increase period over which bandwidth observations are aggregated
  711. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  712. o Minor bugfixes (systemd support):
  713. - Run correctly under systemd with the RunAsDaemon option set. Fixes
  714. part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
  715. - Inform the systemd supervisor about more changes in the Tor
  716. process status. Implements part of ticket 14141. Patch from
  717. Tomasz Torcz.
  718. o Minor bugfixes (testing networks):
  719. - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
  720. testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
  721. - Stop using the default authorities in networks which provide both
  722. AlternateDirAuthority and AlternateBridgeAuthority. Partially
  723. fixes bug 13163; bugfix on 0.2.0.13-alpha.
  724. o Minor bugfixes (testing networks, fast startup):
  725. - Allow Tor to build circuits using a consensus with no exits. If
  726. the consensus has no exits (typical of a bootstrapping test
  727. network), allow Tor to build circuits once enough descriptors have
  728. been downloaded. This assists in bootstrapping a testing Tor
  729. network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
  730. by "teor".
  731. - When V3AuthVotingInterval is low, give a lower If-Modified-Since
  732. header to directory servers. This allows us to obtain consensuses
  733. promptly when the consensus interval is very short. This assists
  734. in bootstrapping a testing Tor network. Fixes parts of bugs 13718
  735. and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
  736. - Stop assuming that private addresses are local when checking
  737. reachability in a TestingTorNetwork. Instead, when testing, assume
  738. all OR connections are remote. (This is necessary due to many test
  739. scenarios running all relays on localhost.) This assists in
  740. bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
  741. 0.1.0.1-rc. Patch by "teor".
  742. - Avoid building exit circuits from a consensus with no exits. Now
  743. thanks to our fix for 13718, we accept a no-exit network as not
  744. wholly lost, but we need to remember not to try to build exit
  745. circuits on it. Closes ticket 13814; patch by "teor".
  746. - Stop requiring exits to have non-zero bandwithcapacity in a
  747. TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
  748. ignore exit bandwidthcapacity. This assists in bootstrapping a
  749. testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
  750. on 0.2.0.3-alpha. Patch by "teor".
  751. - Add "internal" to some bootstrap statuses when no exits are
  752. available. If the consensus does not contain Exits, Tor will only
  753. build internal circuits. In this case, relevant statuses will
  754. contain the word "internal" as indicated in the Tor control-
  755. spec.txt. When bootstrap completes, Tor will be ready to build
  756. internal circuits. If a future consensus contains Exits, exit
  757. circuits may become available. Fixes part of bug 13718; bugfix on
  758. 0.2.4.10-alpha. Patch by "teor".
  759. - Decrease minimum consensus interval to 10 seconds when
  760. TestingTorNetwork is set, or 5 seconds for the first consensus.
  761. Fix assumptions throughout the code that assume larger intervals.
  762. Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
  763. by "teor".
  764. - Avoid excluding guards from path building in minimal test
  765. networks, when we're in a test network and excluding guards would
  766. exclude all relays. This typically occurs in incredibly small tor
  767. networks, and those using "TestingAuthVoteGuard *". Fixes part of
  768. bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
  769. o Minor bugfixes (testing):
  770. - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
  771. 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
  772. - Stop spawn test failures due to a race condition between the
  773. SIGCHLD handler updating the process status, and the test reading
  774. it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
  775. - Avoid passing an extra backslash when creating a temporary
  776. directory for running the unit tests on Windows. Fixes bug 12392;
  777. bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
  778. o Minor bugfixes (TLS):
  779. - Check more thoroughly throughout the TLS code for possible
  780. unlogged TLS errors. Possible diagnostic or fix for bug 13319.
  781. o Minor bugfixes (transparent proxy):
  782. - Use getsockname, not getsockopt, to retrieve the address for a
  783. TPROXY-redirected connection. Fixes bug 13796; bugfix
  784. on 0.2.5.2-alpha.
  785. o Minor bugfixes (windows):
  786. - Remove code to special-case handling of NTE_BAD_KEYSET when
  787. acquiring windows CryptoAPI context. This error can't actually
  788. occur for the parameters we're providing. Fixes bug 10816; bugfix
  789. on 0.0.2pre26.
  790. o Minor bugfixes (zlib):
  791. - Avoid truncating a zlib stream when trying to finalize it with an
  792. empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
  793. o Code simplification and refactoring:
  794. - Change the entry_is_live() function to take named bitfield
  795. elements instead of an unnamed list of booleans. Closes
  796. ticket 12202.
  797. - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
  798. Resolves ticket 12205.
  799. - Use calloc and reallocarray functions instead of multiply-
  800. then-malloc. This makes it less likely for us to fall victim to an
  801. integer overflow attack when allocating. Resolves ticket 12855.
  802. - Use the standard macro name SIZE_MAX, instead of our
  803. own SIZE_T_MAX.
  804. - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
  805. functions which take them as arguments. Replace 0 with NO_DIRINFO
  806. in a function call for clarity. Seeks to prevent future issues
  807. like 13163.
  808. - Avoid 4 null pointer errors under clang static analysis by using
  809. tor_assert() to prove that the pointers aren't null. Fixes
  810. bug 13284.
  811. - Rework the API of policies_parse_exit_policy() to use a bitmask to
  812. represent parsing options, instead of a confusing mess of
  813. booleans. Resolves ticket 8197.
  814. - Introduce a helper function to parse ExitPolicy in
  815. or_options_t structure.
  816. - Move fields related to isolating and configuring client ports into
  817. a shared structure. Previously, they were duplicated across
  818. port_cfg_t, listener_connection_t, and edge_connection_t. Failure
  819. to copy them correctly had been the cause of at least one bug in
  820. the past. Closes ticket 8546.
  821. - Refactor the get_interface_addresses_raw() doom-function into
  822. multiple smaller and simpler subfunctions. Cover the resulting
  823. subfunctions with unit-tests. Fixes a significant portion of
  824. issue 12376.
  825. - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
  826. only for version <= 0.2.2.24 which is now deprecated. Closes
  827. ticket 14202.
  828. - Remove a test for a long-defunct broken version-one
  829. directory server.
  830. - Refactor main loop to extract the 'loop' part. This makes it
  831. easier to run Tor under Shadow. Closes ticket 15176.
  832. - Stop using can_complete_circuits as a global variable; access it
  833. with a function instead.
  834. - Avoid using operators directly as macro arguments: this lets us
  835. apply coccinelle transformations to our codebase more directly.
  836. Closes ticket 13172.
  837. - Combine the functions used to parse ClientTransportPlugin and
  838. ServerTransportPlugin into a single function. Closes ticket 6456.
  839. - Add inline functions and convenience macros for inspecting channel
  840. state. Refactor the code to use convenience macros instead of
  841. checking channel state directly. Fixes issue 7356.
  842. - Document all members of was_router_added_t and rename
  843. ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
  844. confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
  845. - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
  846. constant instead of hardcoded value. Fixes issue 13840.
  847. - Refactor our generic strmap and digestmap types into a single
  848. implementation, so that we can add a new digest256map
  849. type trivially.
  850. o Documentation:
  851. - Add a doc/TUNING document with tips for handling large numbers of
  852. TCP connections when running busy Tor relay. Update the warning
  853. message to point to this file when running out of sockets
  854. operating system is allowing to use simultaneously. Resolves
  855. ticket 9708.
  856. - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
  857. for writing the OpenBSD-specific tips. Resolves ticket 13702.
  858. - Make the tor-resolve documentation match its help string and its
  859. options. Resolves part of ticket 14325.
  860. - Log a more useful error message from tor-resolve when failing to
  861. look up a hidden service address. Resolves part of ticket 14325.
  862. - Document the bridge-authority-only 'networkstatus-bridges' file.
  863. Closes ticket 13713; patch from "tom".
  864. - Fix typo in PredictedPortsRelevanceTime option description in
  865. manpage. Resolves issue 13707.
  866. - Stop suggesting that users specify relays by nickname: it isn't a
  867. good idea. Also, properly cross-reference how to specify relays in
  868. all parts of manual documenting options that take a list of
  869. relays. Closes ticket 13381.
  870. - Clarify the HiddenServiceDir option description in manpage to make
  871. it clear that relative paths are taken with respect to the current
  872. working directory. Also clarify that this behavior is not
  873. guaranteed to remain indefinitely. Fixes issue 13913.
  874. o Distribution (systemd):
  875. - systemd unit file: only allow tor to write to /var/lib/tor and
  876. /var/log/tor. The rest of the filesystem is accessible for reading
  877. only. Patch by intrigeri; resolves ticket 12751.
  878. - systemd unit file: ensure that the process and all its children
  879. can never gain new privileges. Patch by intrigeri; resolves
  880. ticket 12939.
  881. - systemd unit file: set up /var/run/tor as writable for the Tor
  882. service. Patch by intrigeri; resolves ticket 13196.
  883. o Downgraded warnings:
  884. - Don't warn when we've attempted to contact a relay using the wrong
  885. ntor onion key. Closes ticket 9635.
  886. o Removed code:
  887. - Remove some lingering dead code that once supported mempools.
  888. Mempools were disabled by default in 0.2.5, and removed entirely
  889. in 0.2.6.3-alpha. Closes more of ticket 14848; patch
  890. by "cypherpunks".
  891. o Removed features (directory authorities):
  892. - Remove code that prevented authorities from listing Tor relays
  893. affected by CVE-2011-2769 as guards. These relays are already
  894. rejected altogether due to the minimum version requirement of
  895. 0.2.3.16-alpha. Closes ticket 13152.
  896. - The "AuthDirRejectUnlisted" option no longer has any effect, as
  897. the fingerprints file (approved-routers) has been deprecated.
  898. - Directory authorities do not support being Naming dirauths anymore.
  899. The "NamingAuthoritativeDir" config option is now obsolete.
  900. - Directory authorities do not support giving out the BadDirectory
  901. flag anymore.
  902. - Directory authorities no longer advertise or support consensus
  903. methods 1 through 12 inclusive. These consensus methods were
  904. obsolete and/or insecure: maintaining the ability to support them
  905. served no good purpose. Implements part of proposal 215; closes
  906. ticket 10163.
  907. o Removed features:
  908. - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
  909. longer silently accepted as an alias for "ExitNodes".
  910. - The --enable-mempool and --enable-buf-freelists options, which
  911. were originally created to work around bad malloc implementations,
  912. no longer exist. They were off-by-default in 0.2.5. Closes
  913. ticket 14848.
  914. - We no longer remind the user about configuration options that have
  915. been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
  916. - Remove our old, non-weighted bandwidth-based node selection code.
  917. Previously, we used it as a fallback when we couldn't perform
  918. weighted bandwidth-based node selection. But that would only
  919. happen in the cases where we had no consensus, or when we had a
  920. consensus generated by buggy or ancient directory authorities. In
  921. either case, it's better to use the more modern, better maintained
  922. algorithm, with reasonable defaults for the weights. Closes
  923. ticket 13126.
  924. - Remove the --disable-curve25519 configure option. Relays and
  925. clients now are required to support curve25519 and the
  926. ntor handshake.
  927. - The old "StrictEntryNodes" and "StrictExitNodes" options, which
  928. used to be deprecated synonyms for "StrictNodes", are now marked
  929. obsolete. Resolves ticket 12226.
  930. - Clients don't understand the BadDirectory flag in the consensus
  931. anymore, and ignore it.
  932. o Removed platform support:
  933. - We no longer include special code to build on Windows CE; as far
  934. as we know, nobody has used Tor on Windows CE in a very long time.
  935. Closes ticket 11446.
  936. o Testing (test-network.sh):
  937. - Stop using "echo -n", as some shells' built-in echo doesn't
  938. support "-n". Instead, use "/bin/echo -n". Partially fixes
  939. bug 13161.
  940. - Stop an apparent test-network hang when used with make -j2. Fixes
  941. bug 13331.
  942. - Add a --delay option to test-network.sh, which configures the
  943. delay before the chutney network tests for data transmission.
  944. Partially implements ticket 13161.
  945. o Testing:
  946. - Test that tor does not fail when key files are zero-length. Check
  947. that tor generates new keys, and overwrites the empty key files.
  948. - Test that tor generates new keys when keys are missing
  949. (existing behavior).
  950. - Test that tor does not overwrite key files that already contain
  951. data (existing behavior). Tests bug 13111. Patch by "teor".
  952. - New "make test-stem" target to run stem integration tests.
  953. Requires that the "STEM_SOURCE_DIR" environment variable be set.
  954. Closes ticket 14107.
  955. - Make the test_cmdline_args.py script work correctly on Windows.
  956. Patch from Gisle Vanem.
  957. - Move the slower unit tests into a new "./src/test/test-slow"
  958. binary that can be run independently of the other tests. Closes
  959. ticket 13243.
  960. - New tests for many parts of channel, relay, and circuitmux
  961. functionality. Code by Andrea; part of 9262.
  962. - New tests for parse_transport_line(). Part of ticket 6456.
  963. - In the unit tests, use chgrp() to change the group of the unit
  964. test temporary directory to the current user, so that the sticky
  965. bit doesn't interfere with tests that check directory groups.
  966. Closes 13678.
  967. - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
  968. by 'rl1987'.
  969. - Refactor the function that chooses guard nodes so that it can more
  970. easily be tested; write some tests for it.
  971. - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
  972. bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
  973. - Create unit tests for format_time_interval(). With bug 13393.
  974. - Add unit tests for tor_timegm signed overflow, tor_timegm and
  975. parse_rfc1123_time validity checks, correct_tm year clamping. Unit
  976. tests (visible) fixes in bug 13476.
  977. - Add a "coverage-html" make target to generate HTML-visualized
  978. coverage results when building with --enable-coverage. (Requires
  979. lcov.) Patch from Kevin Murray.
  980. - Enable the backtrace handler (where supported) when running the
  981. unit tests.
  982. - Revise all unit tests that used the legacy test_* macros to
  983. instead use the recommended tt_* macros. This patch was generated
  984. with coccinelle, to avoid manual errors. Closes ticket 13119.
  985. Changes in version 0.2.5.11 - 2015-03-17
  986. Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
  987. It backports several bugfixes from the 0.2.6 branch, including a
  988. couple of medium-level security fixes for relays and exit nodes.
  989. It also updates the list of directory authorities.
  990. o Directory authority changes:
  991. - Remove turtles as a directory authority.
  992. - Add longclaw as a new (v3) directory authority. This implements
  993. ticket 13296. This keeps the directory authority count at 9.
  994. - The directory authority Faravahar has a new IP address. This
  995. closes ticket 14487.
  996. o Major bugfixes (crash, OSX, security):
  997. - Fix a remote denial-of-service opportunity caused by a bug in
  998. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  999. in OSX 10.9.
  1000. o Major bugfixes (relay, stability, possible security):
  1001. - Fix a bug that could lead to a relay crashing with an assertion
  1002. failure if a buffer of exactly the wrong layout was passed to
  1003. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  1004. 0.2.0.10-alpha. Patch from 'cypherpunks'.
  1005. - Do not assert if the 'data' pointer on a buffer is advanced to the
  1006. very end of the buffer; log a BUG message instead. Only assert if
  1007. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  1008. o Major bugfixes (exit node stability):
  1009. - Fix an assertion failure that could occur under high DNS load.
  1010. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  1011. diagnosed and fixed by "cypherpunks".
  1012. o Major bugfixes (Linux seccomp2 sandbox):
  1013. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  1014. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  1015. 0.2.5.1-alpha. Patch from "sanic".
  1016. o Minor features (controller):
  1017. - New "GETINFO bw-event-cache" to get information about recent
  1018. bandwidth events. Closes ticket 14128. Useful for controllers to
  1019. get recent bandwidth history after the fix for ticket 13988.
  1020. o Minor features (geoip):
  1021. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  1022. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  1023. Country database.
  1024. o Minor bugfixes (client, automapping):
  1025. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  1026. no value follows the option. Fixes bug 14142; bugfix on
  1027. 0.2.4.7-alpha. Patch by "teor".
  1028. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  1029. 14195; bugfix on 0.1.0.1-rc.
  1030. o Minor bugfixes (compilation):
  1031. - Build without warnings with the stock OpenSSL srtp.h header, which
  1032. has a duplicate declaration of SSL_get_selected_srtp_profile().
  1033. Fixes bug 14220; this is OpenSSL's bug, not ours.
  1034. o Minor bugfixes (directory authority):
  1035. - Allow directory authorities to fetch more data from one another if
  1036. they find themselves missing lots of votes. Previously, they had
  1037. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  1038. bugfix on 0.1.2.5-alpha.
  1039. - Enlarge the buffer to read bwauth generated files to avoid an
  1040. issue when parsing the file in dirserv_read_measured_bandwidths().
  1041. Fixes bug 14125; bugfix on 0.2.2.1-alpha.
  1042. o Minor bugfixes (statistics):
  1043. - Increase period over which bandwidth observations are aggregated
  1044. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  1045. o Minor bugfixes (preventative security, C safety):
  1046. - When reading a hexadecimal, base-32, or base-64 encoded value from
  1047. a string, always overwrite the whole output buffer. This prevents
  1048. some bugs where we would look at (but fortunately, not reveal)
  1049. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  1050. versions of Tor.
  1051. Changes in version 0.2.4.26 - 2015-03-17
  1052. Tor 0.2.4.26 includes an updated list of directory authorities. It
  1053. also backports a couple of stability and security bugfixes from 0.2.5
  1054. and beyond.
  1055. o Directory authority changes:
  1056. - Remove turtles as a directory authority.
  1057. - Add longclaw as a new (v3) directory authority. This implements
  1058. ticket 13296. This keeps the directory authority count at 9.
  1059. - The directory authority Faravahar has a new IP address. This
  1060. closes ticket 14487.
  1061. o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
  1062. - Fix an assertion failure that could occur under high DNS load.
  1063. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  1064. diagnosed and fixed by "cypherpunks".
  1065. o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
  1066. - Fix a bug that could lead to a relay crashing with an assertion
  1067. failure if a buffer of exactly the wrong layout was passed to
  1068. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  1069. 0.2.0.10-alpha. Patch from 'cypherpunks'.
  1070. - Do not assert if the 'data' pointer on a buffer is advanced to the
  1071. very end of the buffer; log a BUG message instead. Only assert if
  1072. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  1073. o Minor features (geoip):
  1074. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  1075. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  1076. Country database.
  1077. Changes in version 0.2.5.10 - 2014-10-24
  1078. Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
  1079. It adds several new security features, including improved
  1080. denial-of-service resistance for relays, new compiler hardening
  1081. options, and a system-call sandbox for hardened installations on Linux
  1082. (requires seccomp2). The controller protocol has several new features,
  1083. resolving IPv6 addresses should work better than before, and relays
  1084. should be a little more CPU-efficient. We've added support for more
  1085. OpenBSD and FreeBSD transparent proxy types. We've improved the build
  1086. system and testing infrastructure to allow unit testing of more parts
  1087. of the Tor codebase. Finally, we've addressed several nagging pluggable
  1088. transport usability issues, and included numerous other small bugfixes
  1089. and features mentioned below.
  1090. This release marks end-of-life for Tor 0.2.3.x; those Tor versions
  1091. have accumulated many known flaws; everyone should upgrade.
  1092. o Major features (security):
  1093. - The ntor handshake is now on-by-default, no matter what the
  1094. directory authorities recommend. Implements ticket 8561.
  1095. - Make the "tor-gencert" tool used by directory authority operators
  1096. create 2048-bit signing keys by default (rather than 1024-bit, since
  1097. 1024-bit is uncomfortably small these days). Addresses ticket 10324.
  1098. - Warn about attempts to run hidden services and relays in the same
  1099. process: that's probably not a good idea. Closes ticket 12908.
  1100. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  1101. today support TLS 1.0 or later, so we can safely turn off support
  1102. for this old (and insecure) protocol. Fixes bug 13426.
  1103. o Major features (relay security, DoS-resistance):
  1104. - When deciding whether we have run out of memory and we need to
  1105. close circuits, also consider memory allocated in buffers for
  1106. streams attached to each circuit.
  1107. This change, which extends an anti-DoS feature introduced in
  1108. 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
  1109. better resist more memory-based DoS attacks than before. Since the
  1110. MaxMemInCellQueues option now applies to all queues, it is renamed
  1111. to MaxMemInQueues. This feature fixes bug 10169.
  1112. - Avoid hash-flooding denial-of-service attacks by using the secure
  1113. SipHash-2-4 hash function for our hashtables. Without this
  1114. feature, an attacker could degrade performance of a targeted
  1115. client or server by flooding their data structures with a large
  1116. number of entries to be stored at the same hash table position,
  1117. thereby slowing down the Tor instance. With this feature, hash
  1118. table positions are derived from a randomized cryptographic key,
  1119. and an attacker cannot predict which entries will collide. Closes
  1120. ticket 4900.
  1121. - If you don't specify MaxMemInQueues yourself, Tor now tries to
  1122. pick a good value based on your total system memory. Previously,
  1123. the default was always 8 GB. You can still override the default by
  1124. setting MaxMemInQueues yourself. Resolves ticket 11396.
  1125. o Major features (bridges and pluggable transports):
  1126. - Add support for passing arguments to managed pluggable transport
  1127. proxies. Implements ticket 3594.
  1128. - Bridges now track GeoIP information and the number of their users
  1129. even when pluggable transports are in use, and report usage
  1130. statistics in their extra-info descriptors. Resolves tickets 4773
  1131. and 5040.
  1132. - Don't launch pluggable transport proxies if we don't have any
  1133. bridges configured that would use them. Now we can list many
  1134. pluggable transports, and Tor will dynamically start one when it
  1135. hears a bridge address that needs it. Resolves ticket 5018.
  1136. - The bridge directory authority now assigns status flags (Stable,
  1137. Guard, etc) to bridges based on thresholds calculated over all
  1138. Running bridges. Now bridgedb can finally make use of its features
  1139. to e.g. include at least one Stable bridge in its answers. Fixes
  1140. bug 9859.
  1141. o Major features (controller):
  1142. - Extend ORCONN controller event to include an "ID" parameter,
  1143. and add four new controller event types CONN_BW, CIRC_BW,
  1144. CELL_STATS, and TB_EMPTY that show connection and circuit usage.
  1145. The new events are emitted in private Tor networks only, with the
  1146. goal of being able to better track performance and load during
  1147. full-network simulations. Implements proposal 218 and ticket 7359.
  1148. o Major features (relay performance):
  1149. - Speed up server-side lookups of rendezvous and introduction point
  1150. circuits by using hashtables instead of linear searches. These
  1151. functions previously accounted between 3 and 7% of CPU usage on
  1152. some busy relays. Resolves ticket 9841.
  1153. - Avoid wasting CPU when extending a circuit over a channel that is
  1154. nearly out of circuit IDs. Previously, we would do a linear scan
  1155. over possible circuit IDs before finding one or deciding that we
  1156. had exhausted our possibilities. Now, we try at most 64 random
  1157. circuit IDs before deciding that we probably won't succeed. Fixes
  1158. a possible root cause of ticket 11553.
  1159. o Major features (seccomp2 sandbox, Linux only):
  1160. - Use the seccomp2 syscall filtering facility on Linux to limit
  1161. which system calls Tor can invoke. This is an experimental,
  1162. Linux-only feature to provide defense-in-depth against unknown
  1163. attacks. To try turning it on, set "Sandbox 1" in your torrc
  1164. file. Please be ready to report bugs. We hope to add support
  1165. for better sandboxing in the future, including more fine-grained
  1166. filters, better division of responsibility, and support for more
  1167. platforms. This work has been done by Cristian-Matei Toader for
  1168. Google Summer of Code. Resolves tickets 11351 and 11465.
  1169. o Major features (testing networks):
  1170. - Make testing Tor networks bootstrap better: lower directory fetch
  1171. retry schedules and maximum interval without directory requests,
  1172. and raise maximum download tries. Implements ticket 6752.
  1173. - Add make target 'test-network' to run tests on a Chutney network.
  1174. Implements ticket 8530.
  1175. o Major features (other):
  1176. - On some platforms (currently: recent OSX versions, glibc-based
  1177. platforms that support the ELF format, and a few other
  1178. Unix-like operating systems), Tor can now dump stack traces
  1179. when a crash occurs or an assertion fails. By default, traces
  1180. are dumped to stderr (if possible) and to any logs that are
  1181. reporting errors. Implements ticket 9299.
  1182. o Deprecated versions:
  1183. - Tor 0.2.3.x has reached end-of-life; it has received no patches or
  1184. attention for some while.
  1185. o Major bugfixes (security, directory authorities):
  1186. - Directory authorities now include a digest of each relay's
  1187. identity key as a part of its microdescriptor.
  1188. This is a workaround for bug 11743 (reported by "cypherpunks"),
  1189. where Tor clients do not support receiving multiple
  1190. microdescriptors with the same SHA256 digest in the same
  1191. consensus. When clients receive a consensus like this, they only
  1192. use one of the relays. Without this fix, a hostile relay could
  1193. selectively disable some client use of target relays by
  1194. constructing a router descriptor with a different identity and the
  1195. same microdescriptor parameters and getting the authorities to
  1196. list it in a microdescriptor consensus. This fix prevents an
  1197. attacker from causing a microdescriptor collision, because the
  1198. router's identity is not forgeable.
  1199. o Major bugfixes (openssl bug workaround):
  1200. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  1201. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
  1202. bug 13471. This is a workaround for an OpenSSL bug.
  1203. o Major bugfixes (client):
  1204. - Perform circuit cleanup operations even when circuit
  1205. construction operations are disabled (because the network is
  1206. disabled, or because there isn't enough directory information).
  1207. Previously, when we were not building predictive circuits, we
  1208. were not closing expired circuits either. Fixes bug 8387; bugfix on
  1209. 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
  1210. became more strict about when we have "enough directory information
  1211. to build circuits".
  1212. o Major bugfixes (client, pluggable transports):
  1213. - When managing pluggable transports, use OS notification facilities
  1214. to learn if they have crashed, and don't attempt to kill any
  1215. process that has already exited. Fixes bug 8746; bugfix
  1216. on 0.2.3.6-alpha.
  1217. o Major bugfixes (relay denial of service):
  1218. - Instead of writing destroy cells directly to outgoing connection
  1219. buffers, queue them and intersperse them with other outgoing cells.
  1220. This can prevent a set of resource starvation conditions where too
  1221. many pending destroy cells prevent data cells from actually getting
  1222. delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
  1223. bugfix on 0.2.0.1-alpha.
  1224. o Major bugfixes (relay):
  1225. - Avoid queuing or sending destroy cells for circuit ID zero when we
  1226. fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
  1227. Found and fixed by "cypherpunks".
  1228. - Fix ORPort reachability detection on relays running behind a
  1229. proxy, by correctly updating the "local" mark on the controlling
  1230. channel when changing the address of an or_connection_t after the
  1231. handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
  1232. - Use a direct dirport connection when uploading non-anonymous
  1233. descriptors to the directory authorities. Previously, relays would
  1234. incorrectly use tunnel connections under a fairly wide variety of
  1235. circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
  1236. - When a circuit accidentally has the same circuit ID for its
  1237. forward and reverse direction, correctly detect the direction of
  1238. cells using that circuit. Previously, this bug made roughly one
  1239. circuit in a million non-functional. Fixes bug 12195; this is a
  1240. bugfix on every version of Tor.
  1241. o Minor features (security):
  1242. - New --enable-expensive-hardening option to enable security
  1243. hardening options that consume nontrivial amounts of CPU and
  1244. memory. Right now, this includes AddressSanitizer and UbSan, which
  1245. are supported in newer versions of GCC and Clang. Closes ticket
  1246. 11477.
  1247. - Authorities now assign the Guard flag to the fastest 25% of the
  1248. network (it used to be the fastest 50%). Also raise the consensus
  1249. weight that guarantees the Guard flag from 250 to 2000. For the
  1250. current network, this results in about 1100 guards, down from 2500.
  1251. This step paves the way for moving the number of entry guards
  1252. down to 1 (proposal 236) while still providing reasonable expected
  1253. performance for most users. Implements ticket 12690.
  1254. o Minor features (security, memory management):
  1255. - Memory allocation tricks (mempools and buffer freelists) are now
  1256. disabled by default. You can turn them back on with
  1257. --enable-mempools and --enable-buf-freelists respectively. We're
  1258. disabling these features because malloc performance is good enough
  1259. on most platforms, and a similar feature in OpenSSL exacerbated
  1260. exploitation of the Heartbleed attack. Resolves ticket 11476.
  1261. o Minor features (bridge client):
  1262. - Report a more useful failure message when we can't connect to a
  1263. bridge because we don't have the right pluggable transport
  1264. configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
  1265. o Minor features (bridge):
  1266. - Add an ExtORPortCookieAuthFileGroupReadable option to make the
  1267. cookie file for the ExtORPort g+r by default.
  1268. o Minor features (bridges, pluggable transports):
  1269. - Bridges now write the SHA1 digest of their identity key
  1270. fingerprint (that is, a hash of a hash of their public key) to
  1271. notice-level logs, and to a new hashed-fingerprint file. This
  1272. information will help bridge operators look up their bridge in
  1273. Globe and similar tools. Resolves ticket 10884.
  1274. - Improve the message that Tor displays when running as a bridge
  1275. using pluggable transports without an Extended ORPort listener.
  1276. Also, log the message in the log file too. Resolves ticket 11043.
  1277. - Add threshold cutoffs to the networkstatus document created by
  1278. the Bridge Authority. Fixes bug 1117.
  1279. - On Windows, spawn background processes using the CREATE_NO_WINDOW
  1280. flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
  1281. doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
  1282. Vidalia set this option for us.) Implements ticket 10297.
  1283. o Minor features (build):
  1284. - The configure script has a --disable-seccomp option to turn off
  1285. support for libseccomp on systems that have it, in case it (or
  1286. Tor's use of it) is broken. Resolves ticket 11628.
  1287. - Assume that a user using ./configure --host wants to cross-compile,
  1288. and give an error if we cannot find a properly named
  1289. tool-chain. Add a --disable-tool-name-check option to proceed
  1290. nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
  1291. - If we run ./configure and the compiler recognizes -fstack-protector
  1292. but the linker rejects it, warn the user about a potentially missing
  1293. libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
  1294. - Add support for `--library-versions` flag. Implements ticket 6384.
  1295. - Return the "unexpected sendme" warnings to a warn severity, but make
  1296. them rate limited, to help diagnose ticket 8093.
  1297. - Detect a missing asciidoc, and warn the user about it, during
  1298. configure rather than at build time. Fixes issue 6506. Patch from
  1299. Arlo Breault.
  1300. o Minor features (client):
  1301. - Add a new option, PredictedPortsRelevanceTime, to control how long
  1302. after having received a request to connect to a given port Tor
  1303. will try to keep circuits ready in anticipation of future requests
  1304. for that port. Patch from "unixninja92"; implements ticket 9176.
  1305. o Minor features (config options and command line):
  1306. - Add an --allow-missing-torrc commandline option that tells Tor to
  1307. run even if the configuration file specified by -f is not available.
  1308. Implements ticket 10060.
  1309. - Add support for the TPROXY transparent proxying facility on Linux.
  1310. See documentation for the new TransProxyType option for more
  1311. details. Implementation by "thomo". Closes ticket 10582.
  1312. o Minor features (config options):
  1313. - Config (torrc) lines now handle fingerprints which are missing
  1314. their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
  1315. - Support a --dump-config option to print some or all of the
  1316. configured options. Mainly useful for debugging the command-line
  1317. option parsing code. Helps resolve ticket 4647.
  1318. - Raise awareness of safer logging: notify user of potentially
  1319. unsafe config options, like logging more verbosely than severity
  1320. "notice" or setting SafeLogging to 0. Resolves ticket 5584.
  1321. - Add a new configuration option TestingV3AuthVotingStartOffset
  1322. that bootstraps a network faster by changing the timing for
  1323. consensus votes. Addresses ticket 8532.
  1324. - Add a new torrc option "ServerTransportOptions" that allows
  1325. bridge operators to pass configuration parameters to their
  1326. pluggable transports. Resolves ticket 8929.
  1327. - The config (torrc) file now accepts bandwidth and space limits in
  1328. bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
  1329. you can now say "16 kilobits", and so on.) Resolves ticket 9214.
  1330. Patch by CharlieB.
  1331. o Minor features (controller):
  1332. - Make the entire exit policy available from the control port via
  1333. GETINFO exit-policy/*. Implements enhancement 7952. Patch from
  1334. "rl1987".
  1335. - Because of the fix for ticket 11396, the real limit for memory
  1336. usage may no longer match the configured MaxMemInQueues value. The
  1337. real limit is now exposed via GETINFO limits/max-mem-in-queues.
  1338. - Add a new "HS_DESC" controller event that reports activities
  1339. related to hidden service descriptors. Resolves ticket 8510.
  1340. - New "DROPGUARDS" controller command to forget all current entry
  1341. guards. Not recommended for ordinary use, since replacing guards
  1342. too frequently makes several attacks easier. Resolves ticket 9934;
  1343. patch from "ra".
  1344. - Implement the TRANSPORT_LAUNCHED control port event that
  1345. notifies controllers about new launched pluggable
  1346. transports. Resolves ticket 5609.
  1347. o Minor features (diagnostic):
  1348. - When logging a warning because of bug 7164, additionally check the
  1349. hash table for consistency (as proposed on ticket 11737). This may
  1350. help diagnose bug 7164.
  1351. - When we log a heartbeat, log how many one-hop circuits we have
  1352. that are at least 30 minutes old, and log status information about
  1353. a few of them. This is an attempt to track down bug 8387.
  1354. - When encountering an unexpected CR while writing text to a file on
  1355. Windows, log the name of the file. Should help diagnosing
  1356. bug 11233.
  1357. - Give more specific warnings when a client notices that an onion
  1358. handshake has failed. Fixes ticket 9635.
  1359. - Add significant new logging code to attempt to diagnose bug 12184,
  1360. where relays seem to run out of available circuit IDs.
  1361. - Improve the diagnostic log message for bug 8387 even further to
  1362. try to improve our odds of figuring out why one-hop directory
  1363. circuits sometimes do not get closed.
  1364. - Add more log messages to diagnose bug 7164, which causes
  1365. intermittent "microdesc_free() called but md was still referenced"
  1366. warnings. We now include more information, to figure out why we
  1367. might be cleaning a microdescriptor for being too old if it's
  1368. still referenced by a live node_t object.
  1369. - Log current accounting state (bytes sent and received + remaining
  1370. time for the current accounting period) in the relay's heartbeat
  1371. message. Implements ticket 5526; patch from Peter Retzlaff.
  1372. o Minor features (geoip):
  1373. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  1374. Country database.
  1375. o Minor features (interface):
  1376. - Generate a warning if any ports are listed in the SocksPolicy,
  1377. DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
  1378. AuthDirBadExit options. (These options only support address
  1379. ranges.) Fixes part of ticket 11108.
  1380. o Minor features (kernel API usage):
  1381. - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
  1382. sockets in a single system call. Implements ticket 5129.
  1383. o Minor features (log messages):
  1384. - When ServerTransportPlugin is set on a bridge, Tor can write more
  1385. useful statistics about bridge use in its extrainfo descriptors,
  1386. but only if the Extended ORPort ("ExtORPort") is set too. Add a
  1387. log message to inform the user in this case. Resolves ticket 9651.
  1388. - When receiving a new controller connection, log the origin address.
  1389. Resolves ticket 9698; patch from "sigpipe".
  1390. - When logging OpenSSL engine status at startup, log the status of
  1391. more engines. Fixes ticket 10043; patch from Joshua Datko.
  1392. o Minor features (log verbosity):
  1393. - Demote the message that we give when a flushing connection times
  1394. out for too long from NOTICE to INFO. It was usually meaningless.
  1395. Resolves ticket 5286.
  1396. - Don't log so many notice-level bootstrapping messages at startup
  1397. about downloading descriptors. Previously, we'd log a notice
  1398. whenever we learned about more routers. Now, we only log a notice
  1399. at every 5% of progress. Fixes bug 9963.
  1400. - Warn less verbosely when receiving a malformed
  1401. ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
  1402. o Minor features (performance):
  1403. - If we're using the pure-C 32-bit curve25519_donna implementation
  1404. of curve25519, build it with the -fomit-frame-pointer option to
  1405. make it go faster on register-starved hosts. This improves our
  1406. handshake performance by about 6% on i386 hosts without nacl.
  1407. Closes ticket 8109.
  1408. o Minor features (relay):
  1409. - If a circuit timed out for at least 3 minutes, check if we have a
  1410. new external IP address, and publish a new descriptor with the new
  1411. IP address if it changed. Resolves ticket 2454.
  1412. o Minor features (testing):
  1413. - If Python is installed, "make check" now runs extra tests beyond
  1414. the unit test scripts.
  1415. - When bootstrapping a test network, sometimes very few relays get
  1416. the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
  1417. specify a set of relays which should be voted Guard regardless of
  1418. their uptime or bandwidth. Addresses ticket 9206.
  1419. o Minor features (transparent proxy, *BSD):
  1420. - Support FreeBSD's ipfw firewall interface for TransPort ports on
  1421. FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
  1422. 10267; patch from "yurivict".
  1423. - Support OpenBSD's divert-to rules with the pf firewall for
  1424. transparent proxy ports. To enable it, set "TransProxyType
  1425. pf-divert". This allows Tor to run a TransPort transparent proxy
  1426. port on OpenBSD 4.4 or later without root privileges. See the
  1427. pf.conf(5) manual page for information on configuring pf to use
  1428. divert-to rules. Closes ticket 10896; patch from Dana Koch.
  1429. o Minor bugfixes (bridge client):
  1430. - Stop accepting bridge lines containing hostnames. Doing so would
  1431. cause clients to perform DNS requests on the hostnames, which was
  1432. not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
  1433. o Minor bugfixes (bridges):
  1434. - Avoid potential crashes or bad behavior when launching a
  1435. server-side managed proxy with ORPort or ExtORPort temporarily
  1436. disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
  1437. - Fix a bug where the first connection works to a bridge that uses a
  1438. pluggable transport with client-side parameters, but we don't send
  1439. the client-side parameters on subsequent connections. (We don't
  1440. use any pluggable transports with client-side parameters yet,
  1441. but ScrambleSuit will soon become the first one.) Fixes bug 9162;
  1442. bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
  1443. o Minor bugfixes (build, auxiliary programs):
  1444. - Stop preprocessing the "torify" script with autoconf, since
  1445. it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
  1446. from Guilhem.
  1447. - The tor-fw-helper program now follows the standard convention and
  1448. exits with status code "0" on success. Fixes bug 9030; bugfix on
  1449. 0.2.3.1-alpha. Patch by Arlo Breault.
  1450. - Corrected ./configure advice for what openssl dev package you should
  1451. install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
  1452. o Minor bugfixes (client):
  1453. - Avoid "Tried to open a socket with DisableNetwork set" warnings
  1454. when starting a client with bridges configured and DisableNetwork
  1455. set. (Tor launcher starts Tor with DisableNetwork set the first
  1456. time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
  1457. - Improve the log message when we can't connect to a hidden service
  1458. because all of the hidden service directory nodes hosting its
  1459. descriptor are excluded. Improves on our fix for bug 10722, which
  1460. was a bugfix on 0.2.0.10-alpha.
  1461. - Raise a control port warning when we fail to connect to all of
  1462. our bridges. Previously, we didn't inform the controller, and
  1463. the bootstrap process would stall. Fixes bug 11069; bugfix on
  1464. 0.2.1.2-alpha.
  1465. - Exit immediately when a process-owning controller exits.
  1466. Previously, tor relays would wait for a little while after their
  1467. controller exited, as if they had gotten an INT signal -- but this
  1468. was problematic, since there was no feedback for the user. To do a
  1469. clean shutdown, controllers should send an INT signal and give Tor
  1470. a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
  1471. - Stop attempting to connect to bridges before our pluggable
  1472. transports are configured (harmless but resulted in some erroneous
  1473. log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
  1474. - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
  1475. generating incorrect SOCKS5 responses, and confusing client
  1476. applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
  1477. o Minor bugfixes (client, DNSPort):
  1478. - When using DNSPort, try to respond to AAAA requests with AAAA
  1479. answers. Previously, we hadn't looked at the request type when
  1480. deciding which answer type to prefer. Fixes bug 10468; bugfix on
  1481. 0.2.4.7-alpha.
  1482. - When receiving a DNS query for an unsupported record type, reply
  1483. with no answer rather than with a NOTIMPL error. This behavior
  1484. isn't correct either, but it will break fewer client programs, we
  1485. hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
  1486. from "epoch".
  1487. o Minor bugfixes (client, logging during bootstrap):
  1488. - Only report the first fatal bootstrap error on a given OR
  1489. connection. This stops us from telling the controller bogus error
  1490. messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
  1491. - Avoid generating spurious warnings when starting with
  1492. DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
  1493. 0.2.3.9-alpha.
  1494. o Minor bugfixes (closing OR connections):
  1495. - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
  1496. check if it's an or_connection_t and correctly call
  1497. connection_or_close_for_error() rather than
  1498. connection_mark_for_close() directly. Fixes bug 11304; bugfix on
  1499. 0.2.4.4-alpha.
  1500. - When closing all connections on setting DisableNetwork to 1, use
  1501. connection_or_close_normally() rather than closing OR connections
  1502. out from under the channel layer. Fixes bug 11306; bugfix on
  1503. 0.2.4.4-alpha.
  1504. o Minor bugfixes (code correctness):
  1505. - Previously we used two temporary files when writing descriptors to
  1506. disk; now we only use one. Fixes bug 1376.
  1507. - Remove an erroneous (but impossible and thus harmless) pointer
  1508. comparison that would have allowed compilers to skip a bounds
  1509. check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
  1510. 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
  1511. - Fix an always-true assertion in pluggable transports code so it
  1512. actually checks what it was trying to check. Fixes bug 10046;
  1513. bugfix on 0.2.3.9-alpha. Found by "dcb".
  1514. o Minor bugfixes (command line):
  1515. - Use a single command-line parser for parsing torrc options on the
  1516. command line and for finding special command-line options to avoid
  1517. inconsistent behavior for torrc option arguments that have the same
  1518. names as command-line options. Fixes bugs 4647 and 9578; bugfix on
  1519. 0.0.9pre5.
  1520. - No longer allow 'tor --hash-password' with no arguments. Fixes bug
  1521. 9573; bugfix on 0.0.9pre5.
  1522. o Minor bugfixes (compilation):
  1523. - Compile correctly with builds and forks of OpenSSL (such as
  1524. LibreSSL) that disable compression. Fixes bug 12602; bugfix on
  1525. 0.2.1.1-alpha. Patch from "dhill".
  1526. - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
  1527. turned off (that is, without support for v2 link handshakes). Fixes
  1528. bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
  1529. - In routerlist_assert_ok(), don't take the address of a
  1530. routerinfo's cache_info member unless that routerinfo is non-NULL.
  1531. Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
  1532. - Fix a large number of false positive warnings from the clang
  1533. analyzer static analysis tool. This should make real warnings
  1534. easier for clang analyzer to find. Patch from "teor". Closes
  1535. ticket 13036.
  1536. - Resolve GCC complaints on OpenBSD about discarding constness in
  1537. TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
  1538. on 0.1.1.23. Patch from Dana Koch.
  1539. - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
  1540. treatment of long and time_t as comparable types. Fixes part of
  1541. bug 11633. Patch from Dana Koch.
  1542. - When deciding whether to build the 64-bit curve25519
  1543. implementation, detect platforms where we can compile 128-bit
  1544. arithmetic but cannot link it. Fixes bug 11729; bugfix on
  1545. 0.2.4.8-alpha. Patch from "conradev".
  1546. - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
  1547. bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
  1548. - Fix compilation with dmalloc. Fixes bug 11605; bugfix
  1549. on 0.2.4.10-alpha.
  1550. - Build and run correctly on systems like OpenBSD-current that have
  1551. patched OpenSSL to remove get_cipher_by_char and/or its
  1552. implementations. Fixes issue 13325.
  1553. o Minor bugfixes (controller and command-line):
  1554. - If changing a config option via "setconf" fails in a recoverable
  1555. way, we used to nonetheless write our new control ports to the
  1556. file described by the "ControlPortWriteToFile" option. Now we only
  1557. write out that file if we successfully switch to the new config
  1558. option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
  1559. o Minor bugfixes (directory server):
  1560. - No longer accept malformed http headers when parsing urls from
  1561. headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
  1562. bugfix on 0.0.6pre1.
  1563. - When sending a compressed set of descriptors or microdescriptors,
  1564. make sure to finalize the zlib stream. Previously, we would write
  1565. all the compressed data, but if the last descriptor we wanted to
  1566. send was missing or too old, we would not mark the stream as
  1567. finished. This caused problems for decompression tools. Fixes bug
  1568. 11648; bugfix on 0.1.1.23.
  1569. o Minor bugfixes (hidden service):
  1570. - Only retry attempts to connect to a chosen rendezvous point 8
  1571. times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
  1572. o Minor bugfixes (interface):
  1573. - Reject relative control socket paths and emit a warning. Previously,
  1574. single-component control socket paths would be rejected, but Tor
  1575. would not log why it could not validate the config. Fixes bug 9258;
  1576. bugfix on 0.2.3.16-alpha.
  1577. o Minor bugfixes (log messages):
  1578. - Fix a bug where clients using bridges would report themselves
  1579. as 50% bootstrapped even without a live consensus document.
  1580. Fixes bug 9922; bugfix on 0.2.1.1-alpha.
  1581. - Suppress a warning where, if there's only one directory authority
  1582. in the network, we would complain that votes and signatures cannot
  1583. be uploaded to other directory authorities. Fixes bug 10842;
  1584. bugfix on 0.2.2.26-beta.
  1585. - Report bootstrapping progress correctly when we're downloading
  1586. microdescriptors. We had updated our "do we have enough microdescs
  1587. to begin building circuits?" logic most recently in 0.2.4.10-alpha
  1588. (see bug 5956), but we left the bootstrap status event logic at
  1589. "how far through getting 1/4 of them are we?" Fixes bug 9958;
  1590. bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
  1591. o Minor bugfixes (logging):
  1592. - Downgrade "Unexpected onionskin length after decryption" warning
  1593. to a protocol-warn, since there's nothing relay operators can do
  1594. about a client that sends them a malformed create cell. Resolves
  1595. bug 12996; bugfix on 0.0.6rc1.
  1596. - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
  1597. cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
  1598. - When logging information about an EXTEND2 or EXTENDED2 cell, log
  1599. their names correctly. Fixes part of bug 12700; bugfix
  1600. on 0.2.4.8-alpha.
  1601. - When logging information about a relay cell whose command we don't
  1602. recognize, log its command as an integer. Fixes part of bug 12700;
  1603. bugfix on 0.2.1.10-alpha.
  1604. - Escape all strings from the directory connection before logging
  1605. them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
  1606. - Squelch a spurious LD_BUG message "No origin circuit for
  1607. successful SOCKS stream" in certain hidden service failure cases;
  1608. fixes bug 10616.
  1609. - Downgrade the severity of the 'unexpected sendme cell from client'
  1610. from 'warn' to 'protocol warning'. Closes ticket 8093.
  1611. o Minor bugfixes (misc code correctness):
  1612. - In munge_extrainfo_into_routerinfo(), check the return value of
  1613. memchr(). This would have been a serious issue if we ever passed
  1614. it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
  1615. from Arlo Breault.
  1616. - On the chance that somebody manages to build Tor on a
  1617. platform where time_t is unsigned, correct the way that
  1618. microdesc_add_to_cache() handles negative time arguments.
  1619. Fixes bug 8042; bugfix on 0.2.3.1-alpha.
  1620. - Fix various instances of undefined behavior in channeltls.c,
  1621. tor_memmem(), and eventdns.c that would cause us to construct
  1622. pointers to memory outside an allocated object. (These invalid
  1623. pointers were not accessed, but C does not even allow them to
  1624. exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
  1625. 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
  1626. - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
  1627. fix some miscellaneous errors in our tests and codebase. Fixes bug
  1628. 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
  1629. - Always check return values for unlink, munmap, UnmapViewOfFile;
  1630. check strftime return values more often. In some cases all we can
  1631. do is report a warning, but this may help prevent deeper bugs from
  1632. going unnoticed. Closes ticket 8787; bugfixes on many, many tor
  1633. versions.
  1634. - Fix numerous warnings from the clang "scan-build" static analyzer.
  1635. Some of these are programming style issues; some of them are false
  1636. positives that indicated awkward code; some are undefined behavior
  1637. cases related to constructing (but not using) invalid pointers;
  1638. some are assumptions about API behavior; some are (harmlessly)
  1639. logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
  1640. correct; and one or two are genuine bugs that weren't reachable
  1641. from the rest of the program. Fixes bug 8793; bugfixes on many,
  1642. many tor versions.
  1643. o Minor bugfixes (node selection):
  1644. - If ExcludeNodes is set, consider non-excluded hidden service
  1645. directory servers before excluded ones. Do not consider excluded
  1646. hidden service directory servers at all if StrictNodes is
  1647. set. (Previously, we would sometimes decide to connect to those
  1648. servers, and then realize before we initiated a connection that
  1649. we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
  1650. Reported by "mr-4".
  1651. - If we set the ExitNodes option but it doesn't include any nodes
  1652. that have the Exit flag, we would choose not to bootstrap. Now we
  1653. bootstrap so long as ExitNodes includes nodes which can exit to
  1654. some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
  1655. o Minor bugfixes (performance):
  1656. - Avoid a bug where every successful connection made us recompute
  1657. the flag telling us whether we have sufficient information to
  1658. build circuits. Previously, we would forget our cached value
  1659. whenever we successfully opened a channel (or marked a router as
  1660. running or not running for any other reason), regardless of
  1661. whether we had previously believed the router to be running. This
  1662. forced us to run an expensive update operation far too often.
  1663. Fixes bug 12170; bugfix on 0.1.2.1-alpha.
  1664. - Avoid using tor_memeq() for checking relay cell integrity. This
  1665. removes a possible performance bottleneck. Fixes part of bug
  1666. 12169; bugfix on 0.2.1.31.
  1667. o Minor bugfixes (platform-specific):
  1668. - When dumping a malformed directory object to disk, save it in
  1669. binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
  1670. 0.2.2.1-alpha.
  1671. - Don't report failures from make_socket_reuseable() on incoming
  1672. sockets on OSX: this can happen when incoming connections close
  1673. early. Fixes bug 10081.
  1674. o Minor bugfixes (pluggable transports):
  1675. - Avoid another 60-second delay when starting Tor in a pluggable-
  1676. transport-using configuration when we already have cached
  1677. descriptors for our bridges. Fixes bug 11965; bugfix
  1678. on 0.2.3.6-alpha.
  1679. o Minor bugfixes (protocol correctness):
  1680. - When receiving a VERSIONS cell with an odd number of bytes, close
  1681. the connection immediately since the cell is malformed. Fixes bug
  1682. 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
  1683. "rl1987".
  1684. o Minor bugfixes (relay, other):
  1685. - We now drop CREATE cells for already-existent circuit IDs and for
  1686. zero-valued circuit IDs, regardless of other factors that might
  1687. otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
  1688. on 0.0.8pre1.
  1689. - When rejecting DATA cells for stream_id zero, still count them
  1690. against the circuit's deliver window so that we don't fail to send
  1691. a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
  1692. o Minor bugfixes (relay, threading):
  1693. - Check return code on spawn_func() in cpuworker code, so that we
  1694. don't think we've spawned a nonworking cpuworker and write junk to
  1695. it forever. Fix related to bug 4345; bugfix on all released Tor
  1696. versions. Found by "skruffy".
  1697. - Use a pthread_attr to make sure that spawn_func() cannot return an
  1698. error while at the same time launching a thread. Fix related to
  1699. bug 4345; bugfix on all released Tor versions. Reported
  1700. by "cypherpunks".
  1701. o Minor bugfixes (relays and bridges):
  1702. - Avoid crashing on a malformed resolv.conf file when running a
  1703. relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
  1704. - Non-exit relays no longer launch mock DNS requests to check for
  1705. DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
  1706. non-exit relays stopped servicing DNS requests. Fixes bug 965;
  1707. bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
  1708. - Bridges now report complete directory request statistics. Related
  1709. to bug 5824; bugfix on 0.2.2.1-alpha.
  1710. - Bridges now never collect statistics that were designed for
  1711. relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
  1712. o Minor bugfixes (testing):
  1713. - Fix all valgrind warnings produced by the unit tests. There were
  1714. over a thousand memory leak warnings previously, mostly produced
  1715. by forgetting to free things in the unit test code. Fixes bug
  1716. 11618, bugfixes on many versions of Tor.
  1717. o Minor bugfixes (tor-fw-helper):
  1718. - Give a correct log message when tor-fw-helper fails to launch.
  1719. (Previously, we would say something like "tor-fw-helper sent us a
  1720. string we could not parse".) Fixes bug 9781; bugfix
  1721. on 0.2.4.2-alpha.
  1722. o Minor bugfixes (trivial memory leaks):
  1723. - Fix a small memory leak when signing a directory object. Fixes bug
  1724. 11275; bugfix on 0.2.4.13-alpha.
  1725. - Resolve some memory leaks found by coverity in the unit tests, on
  1726. exit in tor-gencert, and on a failure to compute digests for our
  1727. own keys when generating a v3 networkstatus vote. These leaks
  1728. should never have affected anyone in practice.
  1729. o Code simplification and refactoring:
  1730. - Remove some old fallback code designed to keep Tor clients working
  1731. in a network with only two working relays. Elsewhere in the code we
  1732. have long since stopped supporting such networks, so there wasn't
  1733. much point in keeping it around. Addresses ticket 9926.
  1734. - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
  1735. bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
  1736. - Extract the common duplicated code for creating a subdirectory
  1737. of the data directory and writing to a file in it. Fixes ticket
  1738. 4282; patch from Peter Retzlaff.
  1739. - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
  1740. buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
  1741. i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
  1742. - Add a set of accessor functions for the circuit timeout data
  1743. structure. Fixes ticket 6153; patch from "piet".
  1744. - Clean up exit paths from connection_listener_new(). Closes ticket
  1745. 8789. Patch from Arlo Breault.
  1746. - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
  1747. and drop our own custom pkey_eq() implementation. Fixes bug 9043.
  1748. - Use a doubly-linked list to implement the global circuit list.
  1749. Resolves ticket 9108. Patch from Marek Majkowski.
  1750. - Remove contrib/id_to_fp.c since it wasn't used anywhere.
  1751. - Remove constants and tests for PKCS1 padding; it's insecure and
  1752. shouldn't be used for anything new. Fixes bug 8792; patch
  1753. from Arlo Breault.
  1754. - Remove instances of strcpy() from the unit tests. They weren't
  1755. hurting anything, since they were only in the unit tests, but it's
  1756. embarassing to have strcpy() in the code at all, and some analysis
  1757. tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
  1758. 0.2.3.8-alpha. Patch from Arlo Breault.
  1759. - Remove is_internal_IP() function. Resolves ticket 4645.
  1760. - Remove unused function circuit_dump_by_chan from circuitlist.c.
  1761. Closes issue 9107; patch from "marek".
  1762. - Change our use of the ENUM_BF macro to avoid declarations that
  1763. confuse Doxygen.
  1764. - Get rid of router->address, since in all cases it was just the
  1765. string representation of router->addr. Resolves ticket 5528.
  1766. o Documentation:
  1767. - Adjust the URLs in the README to refer to the new locations of
  1768. several documents on the website. Fixes bug 12830. Patch from
  1769. Matt Pagan.
  1770. - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
  1771. ticket 12878.
  1772. - Update manpage to describe some of the files you can expect to
  1773. find in Tor's DataDirectory. Addresses ticket 9839.
  1774. - Clean up several option names in the manpage to match their real
  1775. names, add the missing documentation for a couple of testing and
  1776. directory authority options, remove the documentation for a
  1777. V2-directory fetching option that no longer exists. Resolves
  1778. ticket 11634.
  1779. - Correct the documenation so that it lists the correct directory
  1780. for the stats files. (They are in a subdirectory called "stats",
  1781. not "status".)
  1782. - In the manpage, move more authority-only options into the
  1783. directory authority section so that operators of regular directory
  1784. caches don't get confused.
  1785. - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
  1786. 11061; bugfix on 0.2.4.7-alpha.
  1787. - Resolve warnings from Doxygen.
  1788. - Document in the manpage that "KBytes" may also be written as
  1789. "kilobytes" or "KB", that "Kbits" may also be written as
  1790. "kilobits", and so forth. Closes ticket 9222.
  1791. - Document that the ClientOnly config option overrides ORPort.
  1792. Our old explanation made ClientOnly sound as though it did
  1793. nothing at all. Resolves bug 9059.
  1794. - Explain that SocksPolicy, DirPolicy, and similar options don't
  1795. take port arguments. Fixes the other part of ticket 11108.
  1796. - Fix a comment about the rend_server_descriptor_t.protocols field
  1797. to more accurately describe its range. Also, make that field
  1798. unsigned, to more accurately reflect its usage. Fixes bug 9099;
  1799. bugfix on 0.2.1.5-alpha.
  1800. - Fix the manpage's description of HiddenServiceAuthorizeClient:
  1801. the maximum client name length is 16, not 19. Fixes bug 11118;
  1802. bugfix on 0.2.1.6-alpha.
  1803. o Package cleanup:
  1804. - The contrib directory has been sorted and tidied. Before, it was
  1805. an unsorted dumping ground for useful and not-so-useful things.
  1806. Now, it is divided based on functionality, and the items which
  1807. seemed to be nonfunctional or useless have been removed. Resolves
  1808. ticket 8966; based on patches from "rl1987".
  1809. o Removed code and features:
  1810. - Clients now reject any directory authority certificates lacking
  1811. a dir-key-crosscert element. These have been included since
  1812. 0.2.1.9-alpha, so there's no real reason for them to be optional
  1813. any longer. Completes proposal 157. Resolves ticket 10162.
  1814. - Remove all code that existed to support the v2 directory system,
  1815. since there are no longer any v2 directory authorities. Resolves
  1816. ticket 10758.
  1817. - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
  1818. options, which were used for designating authorities as "Hidden
  1819. service authorities". There has been no use of hidden service
  1820. authorities since 0.2.2.1-alpha, when we stopped uploading or
  1821. downloading v0 hidden service descriptors. Fixes bug 10881; also
  1822. part of a fix for bug 10841.
  1823. - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
  1824. and MTBF calculations, but that nobody was using. Fixes bug 11742.
  1825. - The TunnelDirConns and PreferTunnelledDirConns options no longer
  1826. exist; tunneled directory connections have been available since
  1827. 0.1.2.5-alpha, and turning them off is not a good idea. This is a
  1828. brute-force fix for 10849, where "TunnelDirConns 0" would break
  1829. hidden services.
  1830. - Remove all code for the long unused v1 directory protocol.
  1831. Resolves ticket 11070.
  1832. - Remove all remaining code related to version-0 hidden service
  1833. descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
  1834. the rest of bug 10841.
  1835. - Remove migration code from when we renamed the "cached-routers"
  1836. file to "cached-descriptors" back in 0.2.0.8-alpha. This
  1837. incidentally resolves ticket 6502 by cleaning up the related code
  1838. a bit. Patch from Akshay Hebbar.
  1839. o Test infrastructure:
  1840. - Tor now builds each source file in two modes: a mode that avoids
  1841. exposing identifiers needlessly, and another mode that exposes
  1842. more identifiers for testing. This lets the compiler do better at
  1843. optimizing the production code, while enabling us to take more
  1844. radical measures to let the unit tests test things.
  1845. - The production builds no longer include functions used only in
  1846. the unit tests; all functions exposed from a module only for
  1847. unit-testing are now static in production builds.
  1848. - Add an --enable-coverage configuration option to make the unit
  1849. tests (and a new src/or/tor-cov target) to build with gcov test
  1850. coverage support.
  1851. - Update to the latest version of tinytest.
  1852. - Improve the tinytest implementation of string operation tests so
  1853. that comparisons with NULL strings no longer crash the tests; they
  1854. now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
  1855. - New macros in test.h to simplify writing mock-functions for unit
  1856. tests. Part of ticket 11507. Patch from Dana Koch.
  1857. - We now have rudimentary function mocking support that our unit
  1858. tests can use to test functions in isolation. Function mocking
  1859. lets the tests temporarily replace a function's dependencies with
  1860. stub functions, so that the tests can check the function without
  1861. invoking the other functions it calls.
  1862. o Testing:
  1863. - Complete tests for the status.c module. Resolves ticket 11507.
  1864. Patch from Dana Koch.
  1865. - Add more unit tests for the <circid,channel>->circuit map, and
  1866. the destroy-cell-tracking code to fix bug 7912.
  1867. - Unit tests for failing cases of the TAP onion handshake.
  1868. - More unit tests for address-manipulation functions.
  1869. o Distribution (systemd):
  1870. - Include a tor.service file in contrib/dist for use with systemd.
  1871. Some distributions will be able to use this file unmodified;
  1872. others will need to tweak it, or write their own. Patch from Jamie
  1873. Nguyen; resolves ticket 8368.
  1874. - Verify configuration file via ExecStartPre in the systemd unit
  1875. file. Patch from intrigeri; resolves ticket 12730.
  1876. - Explicitly disable RunAsDaemon in the systemd unit file. Our
  1877. current systemd unit uses "Type = simple", so systemd does not
  1878. expect tor to fork. If the user has "RunAsDaemon 1" in their
  1879. torrc, then things won't work as expected. This is e.g. the case
  1880. on Debian (and derivatives), since there we pass "--defaults-torrc
  1881. /usr/share/tor/tor-service-defaults-torrc" (that contains
  1882. "RunAsDaemon 1") by default. Patch by intrigeri; resolves
  1883. ticket 12731.
  1884. Changes in version 0.2.4.25 - 2014-10-20
  1885. Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
  1886. (even though POODLE does not affect Tor). It also works around a crash
  1887. bug caused by some operating systems' response to the "POODLE" attack
  1888. (which does affect Tor).
  1889. o Major security fixes (also in 0.2.5.9-rc):
  1890. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  1891. today support TLS 1.0 or later, so we can safely turn off support
  1892. for this old (and insecure) protocol. Fixes bug 13426.
  1893. o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
  1894. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  1895. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  1896. 13471. This is a workaround for an OpenSSL bug.
  1897. Changes in version 0.2.4.24 - 2014-09-22
  1898. Tor 0.2.4.24 fixes a bug that affects consistency and speed when
  1899. connecting to hidden services, and it updates the location of one of
  1900. the directory authorities.
  1901. o Major bugfixes:
  1902. - Clients now send the correct address for their chosen rendezvous
  1903. point when trying to access a hidden service. They used to send
  1904. the wrong address, which would still work some of the time because
  1905. they also sent the identity digest of the rendezvous point, and if
  1906. the hidden service happened to try connecting to the rendezvous
  1907. point from a relay that already had a connection open to it,
  1908. the relay would reuse that connection. Now connections to hidden
  1909. services should be more robust and faster. Also, this bug meant
  1910. that clients were leaking to the hidden service whether they were
  1911. on a little-endian (common) or big-endian (rare) system, which for
  1912. some users might have reduced their anonymity. Fixes bug 13151;
  1913. bugfix on 0.2.1.5-alpha.
  1914. o Directory authority changes:
  1915. - Change IP address for gabelmoo (v3 directory authority).
  1916. o Minor features (geoip):
  1917. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  1918. Country database.
  1919. Changes in version 0.2.4.23 - 2014-07-28
  1920. Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
  1921. guard rotation, and also backports several important fixes from the
  1922. Tor 0.2.5 alpha release series.
  1923. o Major features:
  1924. - Clients now look at the "usecreatefast" consensus parameter to
  1925. decide whether to use CREATE_FAST or CREATE cells for the first hop
  1926. of their circuit. This approach can improve security on connections
  1927. where Tor's circuit handshake is stronger than the available TLS
  1928. connection security levels, but the tradeoff is more computational
  1929. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  1930. - Make the number of entry guards configurable via a new
  1931. NumEntryGuards consensus parameter, and the number of directory
  1932. guards configurable via a new NumDirectoryGuards consensus
  1933. parameter. Implements ticket 12688.
  1934. o Major bugfixes:
  1935. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  1936. implementation that caused incorrect results on 32-bit
  1937. implementations when certain malformed inputs were used along with
  1938. a small class of private ntor keys. This bug does not currently
  1939. appear to allow an attacker to learn private keys or impersonate a
  1940. Tor server, but it could provide a means to distinguish 32-bit Tor
  1941. implementations from 64-bit Tor implementations. Fixes bug 12694;
  1942. bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
  1943. Adam Langley.
  1944. o Minor bugfixes:
  1945. - Warn and drop the circuit if we receive an inbound 'relay early'
  1946. cell. Those used to be normal to receive on hidden service circuits
  1947. due to bug 1038, but the buggy Tor versions are long gone from
  1948. the network so we can afford to resume watching for them. Resolves
  1949. the rest of bug 1038; bugfix on 0.2.1.19.
  1950. - Correct a confusing error message when trying to extend a circuit
  1951. via the control protocol but we don't know a descriptor or
  1952. microdescriptor for one of the specified relays. Fixes bug 12718;
  1953. bugfix on 0.2.3.1-alpha.
  1954. - Avoid an illegal read from stack when initializing the TLS
  1955. module using a version of OpenSSL without all of the ciphers
  1956. used by the v2 link handshake. Fixes bug 12227; bugfix on
  1957. 0.2.4.8-alpha. Found by "starlight".
  1958. o Minor features:
  1959. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  1960. Country database.
  1961. Changes in version 0.2.4.22 - 2014-05-16
  1962. Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
  1963. alpha release series. These include blocking all authority signing
  1964. keys that may have been affected by the OpenSSL "heartbleed" bug,
  1965. choosing a far more secure set of TLS ciphersuites by default, closing
  1966. a couple of memory leaks that could be used to run a target relay out
  1967. of RAM, and several others.
  1968. o Major features (security, backport from 0.2.5.4-alpha):
  1969. - Block authority signing keys that were used on authorities
  1970. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  1971. don't have any evidence that these keys _were_ compromised; we're
  1972. doing this to be prudent.) Resolves ticket 11464.
  1973. o Major bugfixes (security, OOM):
  1974. - Fix a memory leak that could occur if a microdescriptor parse
  1975. fails during the tokenizing step. This bug could enable a memory
  1976. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  1977. on 0.2.2.6-alpha.
  1978. o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
  1979. - The relay ciphersuite list is now generated automatically based on
  1980. uniform criteria, and includes all OpenSSL ciphersuites with
  1981. acceptable strength and forward secrecy. Previously, we had left
  1982. some perfectly fine ciphersuites unsupported due to omission or
  1983. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  1984. 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
  1985. - Relays now trust themselves to have a better view than clients of
  1986. which TLS ciphersuites are better than others. (Thanks to bug
  1987. 11513, the relay list is now well-considered, whereas the client
  1988. list has been chosen mainly for anti-fingerprinting purposes.)
  1989. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  1990. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  1991. AES128. Resolves ticket 11528.
  1992. - Clients now try to advertise the same list of ciphersuites as
  1993. Firefox 28. This change enables selection of (fast) GCM
  1994. ciphersuites, disables some strange old ciphers, and stops
  1995. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  1996. Resolves ticket 11438.
  1997. o Minor bugfixes (configuration, security):
  1998. - When running a hidden service, do not allow TunneledDirConns 0:
  1999. trying to set that option together with a hidden service would
  2000. otherwise prevent the hidden service from running, and also make
  2001. it publish its descriptors directly over HTTP. Fixes bug 10849;
  2002. bugfix on 0.2.1.1-alpha.
  2003. o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
  2004. - Avoid sending a garbage value to the controller when a circuit is
  2005. cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
  2006. o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
  2007. - Stop leaking memory when we successfully resolve a PTR record.
  2008. Fixes bug 11437; bugfix on 0.2.4.7-alpha.
  2009. o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
  2010. - Avoid 60-second delays in the bootstrapping process when Tor is
  2011. launching for a second time while using bridges. Fixes bug 9229;
  2012. bugfix on 0.2.0.3-alpha.
  2013. o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
  2014. - Give the correct URL in the warning message when trying to run a
  2015. relay on an ancient version of Windows. Fixes bug 9393.
  2016. o Minor bugfixes (compilation):
  2017. - Fix a compilation error when compiling with --disable-curve25519.
  2018. Fixes bug 9700; bugfix on 0.2.4.17-rc.
  2019. o Minor bugfixes:
  2020. - Downgrade the warning severity for the the "md was still
  2021. referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
  2022. for trying to diagnose this bug, and the current warning in
  2023. earlier versions of tor achieves nothing useful. Addresses warning
  2024. from bug 7164.
  2025. o Minor features (log verbosity, backport from 0.2.5.4-alpha):
  2026. - When we run out of usable circuit IDs on a channel, log only one
  2027. warning for the whole channel, and describe how many circuits
  2028. there were on the channel. Fixes part of ticket 11553.
  2029. o Minor features (security, backport from 0.2.5.4-alpha):
  2030. - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
  2031. leave the default at 8GBytes), to better support Raspberry Pi
  2032. users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
  2033. o Documentation (backport from 0.2.5.4-alpha):
  2034. - Correctly document that we search for a system torrc file before
  2035. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  2036. 0.2.3.18-rc.
  2037. Changes in version 0.2.4.21 - 2014-02-28
  2038. Tor 0.2.4.21 further improves security against potential adversaries who
  2039. find breaking 1024-bit crypto doable, and backports several stability
  2040. and robustness patches from the 0.2.5 branch.
  2041. o Major features (client security):
  2042. - When we choose a path for a 3-hop circuit, make sure it contains
  2043. at least one relay that supports the NTor circuit extension
  2044. handshake. Otherwise, there is a chance that we're building
  2045. a circuit that's worth attacking by an adversary who finds
  2046. breaking 1024-bit crypto doable, and that chance changes the game
  2047. theory. Implements ticket 9777.
  2048. o Major bugfixes:
  2049. - Do not treat streams that fail with reason
  2050. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  2051. since it could also indicate an ENETUNREACH connection error. Fixes
  2052. part of bug 10777; bugfix on 0.2.4.8-alpha.
  2053. o Code simplification and refactoring:
  2054. - Remove data structures which were introduced to implement the
  2055. CellStatistics option: they are now redundant with the new timestamp
  2056. field in the regular packed_cell_t data structure, which we did
  2057. in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
  2058. o Minor features:
  2059. - Always clear OpenSSL bignums before freeing them -- even bignums
  2060. that don't contain secrets. Resolves ticket 10793. Patch by
  2061. Florent Daigniere.
  2062. - Build without warnings under clang 3.4. (We have some macros that
  2063. define static functions only some of which will get used later in
  2064. the module. Starting with clang 3.4, these give a warning unless the
  2065. unused attribute is set on them.) Resolves ticket 10904.
  2066. - Update geoip and geoip6 files to the February 7 2014 Maxmind
  2067. GeoLite2 Country database.
  2068. o Minor bugfixes:
  2069. - Set the listen() backlog limit to the largest actually supported
  2070. on the system, not to the value in a header file. Fixes bug 9716;
  2071. bugfix on every released Tor.
  2072. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  2073. exit node as a NOROUTE error, not an INTERNAL error, since they
  2074. can apparently happen when trying to connect to the wrong sort
  2075. of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
  2076. - Fix build warnings about missing "a2x" comment when building the
  2077. manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
  2078. Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
  2079. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  2080. not entirely remove it from the connection lists. Fixes bug 9602;
  2081. bugfix on 0.2.4.4-alpha.
  2082. - Fix a segmentation fault in our benchmark code when running with
  2083. Fedora's OpenSSL package, or any other OpenSSL that provides
  2084. ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
  2085. - Turn "circuit handshake stats since last time" log messages into a
  2086. heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
  2087. o Documentation fixes:
  2088. - Document that all but one DirPort entry must have the NoAdvertise
  2089. flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
  2090. Changes in version 0.2.4.20 - 2013-12-22
  2091. Tor 0.2.4.20 fixes potentially poor random number generation for users
  2092. who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
  2093. torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
  2094. and 4) have no state file in their DataDirectory (as would happen on
  2095. first start). Users who generated relay or hidden service identity
  2096. keys in such a situation should discard them and generate new ones.
  2097. This release also fixes a logic error that caused Tor clients to build
  2098. many more preemptive circuits than they actually need.
  2099. o Major bugfixes:
  2100. - Do not allow OpenSSL engines to replace the PRNG, even when
  2101. HardwareAccel is set. The only default builtin PRNG engine uses
  2102. the Intel RDRAND instruction to replace the entire PRNG, and
  2103. ignores all attempts to seed it with more entropy. That's
  2104. cryptographically stupid: the right response to a new alleged
  2105. entropy source is never to discard all previously used entropy
  2106. sources. Fixes bug 10402; works around behavior introduced in
  2107. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  2108. and "rl1987".
  2109. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  2110. address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
  2111. - Avoid launching spurious extra circuits when a stream is pending.
  2112. This fixes a bug where any circuit that _wasn't_ unusable for new
  2113. streams would be treated as if it were, causing extra circuits to
  2114. be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
  2115. o Minor bugfixes:
  2116. - Avoid a crash bug when starting with a corrupted microdescriptor
  2117. cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
  2118. - If we fail to dump a previously cached microdescriptor to disk, avoid
  2119. freeing duplicate data later on. Fixes bug 10423; bugfix on
  2120. 0.2.4.13-alpha. Spotted by "bobnomnom".
  2121. Changes in version 0.2.4.19 - 2013-12-11
  2122. The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
  2123. (1986-2013). Aaron worked on diverse projects including helping to guide
  2124. Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
  2125. transparency to the U.S government's PACER documents, and contributing
  2126. design and development for Tor and Tor2Web. Aaron was one of the latest
  2127. martyrs in our collective fight for civil liberties and human rights,
  2128. and his death is all the more painful because he was one of us.
  2129. Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
  2130. a new circuit handshake and link encryption that use ECC to provide
  2131. better security and efficiency; makes relays better manage circuit
  2132. creation requests; uses "directory guards" to reduce client enumeration
  2133. risks; makes bridges collect and report statistics about the pluggable
  2134. transports they support; cleans up and improves our geoip database;
  2135. gets much closer to IPv6 support for clients, bridges, and relays; makes
  2136. directory authorities use measured bandwidths rather than advertised
  2137. ones when computing flags and thresholds; disables client-side DNS
  2138. caching to reduce tracking risks; and fixes a big bug in bridge
  2139. reachability testing. This release introduces two new design
  2140. abstractions in the code: a new "channel" abstraction between circuits
  2141. and or_connections to allow for implementing alternate relay-to-relay
  2142. transports, and a new "circuitmux" abstraction storing the queue of
  2143. circuits for a channel. The release also includes many stability,
  2144. security, and privacy fixes.
  2145. o Major features (new circuit handshake):
  2146. - Tor now supports a new circuit extension handshake designed by Ian
  2147. Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
  2148. circuit extension handshake, later called "TAP", was a bit slow
  2149. (especially on the relay side), had a fragile security proof, and
  2150. used weaker keys than we'd now prefer. The new circuit handshake
  2151. uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
  2152. function, making it significantly more secure than the older
  2153. handshake, and significantly faster. Tor can use one of two built-in
  2154. pure-C curve25519-donna implementations by Adam Langley, or it
  2155. can link against the "nacl" library for a tuned version if present.
  2156. The built-in version is very fast for 64-bit systems when building
  2157. with GCC. The built-in 32-bit version is still faster than the
  2158. old TAP protocol, but using libnacl is better on most such hosts.
  2159. Implements proposal 216; closes ticket 7202.
  2160. o Major features (better link encryption):
  2161. - Relays can now enable the ECDHE TLS ciphersuites when available
  2162. and appropriate. These ciphersuites let us negotiate forward-secure
  2163. TLS secret keys more safely and more efficiently than with our
  2164. previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
  2165. public relays prefer the (faster) P224 group, and bridges prefer
  2166. the (more common) P256 group; you can override this with the
  2167. TLSECGroup option.
  2168. This feature requires clients running 0.2.3.17-beta or later,
  2169. and requires both sides to be running OpenSSL 1.0.0 or later
  2170. with ECC support. OpenSSL 1.0.1, with the compile-time option
  2171. "enable-ec_nistp_64_gcc_128", is highly recommended.
  2172. Implements the relay side of proposal 198; closes ticket 7200.
  2173. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  2174. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  2175. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  2176. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  2177. them to solve bug 6033.)
  2178. o Major features (relay performance):
  2179. - Instead of limiting the number of queued onionskins (aka circuit
  2180. create requests) to a fixed, hard-to-configure number, we limit
  2181. the size of the queue based on how many we expect to be able to
  2182. process in a given amount of time. We estimate the time it will
  2183. take to process an onionskin based on average processing time
  2184. of previous onionskins. Closes ticket 7291. You'll never have to
  2185. configure MaxOnionsPending again.
  2186. - Relays process the new "NTor" circuit-level handshake requests
  2187. with higher priority than the old "TAP" circuit-level handshake
  2188. requests. We still process some TAP requests to not totally starve
  2189. 0.2.3 clients when NTor becomes popular. A new consensus parameter
  2190. "NumNTorsPerTAP" lets us tune the balance later if we need to.
  2191. Implements ticket 9574.
  2192. o Major features (client bootstrapping resilience):
  2193. - Add a new "FallbackDir" torrc option to use when we can't use
  2194. a directory mirror from the consensus (either because we lack a
  2195. consensus, or because they're all down). Currently, all authorities
  2196. are fallbacks by default, and there are no other default fallbacks,
  2197. but that will change. This option will allow us to give clients a
  2198. longer list of servers to try to get a consensus from when first
  2199. connecting to the Tor network, and thereby reduce load on the
  2200. directory authorities. Implements proposal 206, "Preconfigured
  2201. directory sources for bootstrapping". We also removed the old
  2202. "FallbackNetworkstatus" option, since we never got it working well
  2203. enough to use it. Closes bug 572.
  2204. - If we have no circuits open, use a relaxed timeout (the
  2205. 95th-percentile cutoff) until a circuit succeeds. This heuristic
  2206. should allow Tor to succeed at building circuits even when the
  2207. network connection drastically changes. Should help with bug 3443.
  2208. o Major features (use of guards):
  2209. - Support directory guards (proposal 207): when possible, clients now
  2210. use their entry guards for non-anonymous directory requests. This
  2211. can help prevent client enumeration. Note that this behavior only
  2212. works when we have a usable consensus directory, and when options
  2213. about what to download are more or less standard. In the future we
  2214. should re-bootstrap from our guards, rather than re-bootstrapping
  2215. from the preconfigured list of directory sources that ships with
  2216. Tor. Resolves ticket 6526.
  2217. - Raise the default time that a client keeps an entry guard from
  2218. "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
  2219. 2012 paper. (We would make it even longer, but we need better client
  2220. load balancing first.) Also, make the guard lifetime controllable
  2221. via a new GuardLifetime torrc option and a GuardLifetime consensus
  2222. parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
  2223. o Major features (bridges with pluggable transports):
  2224. - Bridges now report the pluggable transports they support to the
  2225. bridge authority, so it can pass the supported transports on to
  2226. bridgedb and/or eventually do reachability testing. Implements
  2227. ticket 3589.
  2228. - Automatically forward the TCP ports of pluggable transport
  2229. proxies using tor-fw-helper if PortForwarding is enabled. Implements
  2230. ticket 4567.
  2231. o Major features (geoip database):
  2232. - Maxmind began labelling Tor relays as being in country "A1",
  2233. which breaks by-country node selection inside Tor. Now we use a
  2234. script to replace "A1" ("Anonymous Proxy") entries in our geoip
  2235. file with real country codes. This script fixes about 90% of "A1"
  2236. entries automatically and uses manual country code assignments to
  2237. fix the remaining 10%. See src/config/README.geoip for details.
  2238. Fixes bug 6266.
  2239. - Add GeoIP database for IPv6 addresses. The new config option
  2240. is GeoIPv6File.
  2241. - Update to the October 2 2013 Maxmind GeoLite Country database.
  2242. o Major features (IPv6):
  2243. - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
  2244. IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
  2245. to happen. Implements ticket 5535.
  2246. - All kind of relays, not just bridges, can now advertise an IPv6
  2247. OR port. Implements ticket 6362.
  2248. - Relays can now exit to IPv6 addresses: make sure that you have IPv6
  2249. connectivity, then set the IPv6Exit flag to 1. Also make sure your
  2250. exit policy reads as you would like: the address * applies to all
  2251. address families, whereas *4 is IPv4 address only, and *6 is IPv6
  2252. addresses only. On the client side, you'll need to wait for enough
  2253. exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
  2254. and use Socks5. Closes ticket 5547, implements proposal 117 as
  2255. revised in proposal 208.
  2256. - Bridge authorities now accept IPv6 bridge addresses and include
  2257. them in network status documents. Implements ticket 5534.
  2258. - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
  2259. o Major features (directory authorities):
  2260. - Directory authorities now prefer using measured bandwidths to
  2261. advertised ones when computing flags and thresholds. Resolves
  2262. ticket 8273.
  2263. - Directory authorities that vote measured bandwidths about more
  2264. than a threshold number of relays now treat relays with
  2265. unmeasured bandwidths as having bandwidth 0 when computing their
  2266. flags. Resolves ticket 8435.
  2267. - Directory authorities now support a new consensus method (17)
  2268. where they cap the published bandwidth of relays for which
  2269. insufficient bandwidth measurements exist. Fixes part of bug 2286.
  2270. - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
  2271. serve any v2 directory information. Now we can test disabling the
  2272. old deprecated v2 directory format, and see whether doing so has
  2273. any effect on network load. Begins to fix bug 6783.
  2274. o Major features (build and portability):
  2275. - Switch to a nonrecursive Makefile structure. Now instead of each
  2276. Makefile.am invoking other Makefile.am's, there is a master
  2277. Makefile.am that includes the others. This change makes our build
  2278. process slightly more maintainable, and improves parallelism for
  2279. building with make -j. Original patch by Stewart Smith; various
  2280. fixes by Jim Meyering.
  2281. - Where available, we now use automake's "silent" make rules by
  2282. default, so that warnings are easier to spot. You can get the old
  2283. behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
  2284. - Resume building correctly with MSVC and Makefile.nmake. This patch
  2285. resolves numerous bugs and fixes reported by ultramage, including
  2286. 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
  2287. o Security features:
  2288. - Switch to a completely time-invariant approach for picking nodes
  2289. weighted by bandwidth. Our old approach would run through the
  2290. part of the loop after it had made its choice slightly slower
  2291. than it ran through the part of the loop before it had made its
  2292. choice. Addresses ticket 6538.
  2293. - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
  2294. by tor2web clients allows hidden services to identify tor2web
  2295. clients through their repeated selection of the same rendezvous
  2296. and introduction point circuit endpoints (their guards). Resolves
  2297. ticket 6888.
  2298. o Major bugfixes (relay denial of service):
  2299. - When we have too much memory queued in circuits (according to a new
  2300. MaxMemInCellQueues option), close the circuits that have the oldest
  2301. queued cells, on the theory that those are most responsible for
  2302. us running low on memory. This prevents us from running out of
  2303. memory as a relay if circuits fill up faster than they can be
  2304. drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
  2305. Tor. This bug is a further fix beyond bug 6252, whose fix was
  2306. merged into 0.2.3.21-rc.
  2307. - Reject bogus create and relay cells with 0 circuit ID or 0 stream
  2308. ID: these could be used to create unexpected streams and circuits
  2309. which would count as "present" to some parts of Tor but "absent"
  2310. to others, leading to zombie circuits and streams or to a bandwidth
  2311. denial-of-service. Fixes bug 7889; bugfix on every released version
  2312. of Tor. Reported by "oftc_must_be_destroyed".
  2313. - Avoid a bug where our response to TLS renegotiation under certain
  2314. network conditions could lead to a busy-loop, with 100% CPU
  2315. consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
  2316. o Major bugfixes (asserts, crashes, leaks):
  2317. - Prevent the get_freelists() function from running off the end of
  2318. the list of freelists if it somehow gets an unrecognized
  2319. allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
  2320. eugenis.
  2321. - Avoid a memory leak where we would leak a consensus body when we
  2322. find that a consensus which we couldn't previously verify due to
  2323. missing certificates is now verifiable. Fixes bug 8719; bugfix
  2324. on 0.2.0.10-alpha.
  2325. - If we are unable to save a microdescriptor to the journal, do not
  2326. drop it from memory and then reattempt downloading it. Fixes bug
  2327. 9645; bugfix on 0.2.2.6-alpha.
  2328. - Fix an assertion failure that would occur when disabling the
  2329. ORPort setting on a running Tor process while accounting was
  2330. enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
  2331. - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
  2332. when an exit connection with optimistic data succeeds immediately
  2333. rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
  2334. 0.2.3.1-alpha.
  2335. - Fix a memory leak that would occur whenever a configuration
  2336. option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
  2337. o Major bugfixes (relay rate limiting):
  2338. - When a TLS write is partially successful but incomplete, remember
  2339. that the flushed part has been flushed, and notice that bytes were
  2340. actually written. Reported and fixed pseudonymously. Fixes bug 7708;
  2341. bugfix on Tor 0.1.0.5-rc.
  2342. - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
  2343. to 1GB/1GB. The previous defaults were intended to be "basically
  2344. infinite", but it turns out they're now limiting our 100mbit+
  2345. relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
  2346. last time we raised it).
  2347. - No longer stop reading or writing on cpuworker connections when
  2348. our rate limiting buckets go empty. Now we should handle circuit
  2349. handshake requests more promptly. Resolves bug 9731.
  2350. o Major bugfixes (client-side privacy):
  2351. - When we mark a circuit as unusable for new circuits, have it
  2352. continue to be unusable for new circuits even if MaxCircuitDirtiness
  2353. is increased too much at the wrong time, or the system clock jumps
  2354. backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
  2355. - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
  2356. which have resolved to internal addresses") is set, apply that
  2357. rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
  2358. - When an exit relay rejects a stream with reason "exit policy", but
  2359. we only know an exit policy summary (e.g. from the microdesc
  2360. consensus) for it, do not mark the relay as useless for all exiting.
  2361. Instead, mark just the circuit as unsuitable for that particular
  2362. address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
  2363. o Major bugfixes (stream isolation):
  2364. - Allow applications to get proper stream isolation with
  2365. IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
  2366. username/password authentication also offer "no authentication". Tor
  2367. had previously preferred "no authentication", so the applications
  2368. never actually sent Tor their auth details. Now Tor selects
  2369. username/password authentication if it's offered. You can disable
  2370. this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
  2371. bug 8117; bugfix on 0.2.3.3-alpha.
  2372. - Follow the socks5 protocol when offering username/password
  2373. authentication. The fix for bug 8117 exposed this bug, and it
  2374. turns out real-world applications like Pidgin do care. Bugfix on
  2375. 0.2.3.2-alpha; fixes bug 8879.
  2376. o Major bugfixes (client circuit building):
  2377. - Alter circuit build timeout measurement to start at the point
  2378. where we begin the CREATE/CREATE_FAST step (as opposed to circuit
  2379. initialization). This should make our timeout measurements more
  2380. uniform. Previously, we were sometimes including ORconn setup time
  2381. in our circuit build time measurements. Should resolve bug 3443.
  2382. - If the circuit build timeout logic is disabled (via the consensus,
  2383. or because we are an authority), then don't build testing circuits.
  2384. Fixes bug 9657; bugfix on 0.2.2.14-alpha.
  2385. o Major bugfixes (client-side DNS):
  2386. - Turn off the client-side DNS cache by default. Updating and using
  2387. the DNS cache is now configurable on a per-client-port
  2388. level. SOCKSPort, DNSPort, etc lines may now contain
  2389. {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
  2390. cache these types of DNS answers when we receive them from an
  2391. exit node in response to an application request on this port, and
  2392. {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
  2393. cached DNS answers of these types, we shouldn't use them. It's
  2394. potentially risky to use cached DNS answers at the client, since
  2395. doing so can indicate to one exit what answers we've gotten
  2396. for DNS lookups in the past. With IPv6, this becomes especially
  2397. problematic. Using cached DNS answers for requests on the same
  2398. circuit would present less linkability risk, since all traffic
  2399. on a circuit is already linkable, but it would also provide
  2400. little performance benefit: the exit node caches DNS replies
  2401. too. Implements a simplified version of Proposal 205. Implements
  2402. ticket 7570.
  2403. o Major bugfixes (hidden service privacy):
  2404. - Limit hidden service descriptors to at most ten introduction
  2405. points, to slow one kind of guard enumeration. Fixes bug 9002;
  2406. bugfix on 0.1.1.11-alpha.
  2407. o Major bugfixes (directory fetching):
  2408. - If the time to download the next old-style networkstatus is in
  2409. the future, do not decline to consider whether to download the
  2410. next microdescriptor networkstatus. Fixes bug 9564; bugfix on
  2411. 0.2.3.14-alpha.
  2412. - We used to always request authority certificates by identity digest,
  2413. meaning we'd get the newest one even when we wanted one with a
  2414. different signing key. Then we would complain about being given
  2415. a certificate we already had, and never get the one we really
  2416. wanted. Now we use the "fp-sk/" resource as well as the "fp/"
  2417. resource to request the one we want. Fixes bug 5595; bugfix on
  2418. 0.2.0.8-alpha.
  2419. o Major bugfixes (bridge reachability):
  2420. - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
  2421. previously they did not, which prevented them from receiving
  2422. successful connections from relays for self-test or bandwidth
  2423. testing. Also, when a relay is extending a circuit to a bridge,
  2424. it needs to send a NETINFO cell, even when the bridge hasn't sent
  2425. an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
  2426. o Major bugfixes (control interface):
  2427. - When receiving a new configuration file via the control port's
  2428. LOADCONF command, do not treat the defaults file as absent.
  2429. Fixes bug 9122; bugfix on 0.2.3.9-alpha.
  2430. o Major bugfixes (directory authorities):
  2431. - Stop marking every relay as having been down for one hour every
  2432. time we restart a directory authority. These artificial downtimes
  2433. were messing with our Stable and Guard flag calculations. Fixes
  2434. bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
  2435. - When computing directory thresholds, ignore any rejected-as-sybil
  2436. nodes during the computation so that they can't influence Fast,
  2437. Guard, etc. (We should have done this for proposal 109.) Fixes
  2438. bug 8146.
  2439. - When marking a node as a likely sybil, reset its uptime metrics
  2440. to zero, so that it cannot time towards getting marked as Guard,
  2441. Stable, or HSDir. (We should have done this for proposal 109.) Fixes
  2442. bug 8147.
  2443. - Fix a bug in the voting algorithm that could yield incorrect results
  2444. when a non-naming authority declared too many flags. Fixes bug 9200;
  2445. bugfix on 0.2.0.3-alpha.
  2446. o Internal abstraction features:
  2447. - Introduce new channel_t abstraction between circuits and
  2448. or_connection_t to allow for implementing alternate OR-to-OR
  2449. transports. A channel_t is an abstract object which can either be a
  2450. cell-bearing channel, which is responsible for authenticating and
  2451. handshaking with the remote OR and transmitting cells to and from
  2452. it, or a listening channel, which spawns new cell-bearing channels
  2453. at the request of remote ORs. Implements part of ticket 6465.
  2454. - Make a channel_tls_t subclass of channel_t, adapting it to the
  2455. existing or_connection_t code. The V2/V3 protocol handshaking
  2456. code which formerly resided in command.c has been moved below the
  2457. channel_t abstraction layer and may be found in channeltls.c now.
  2458. Implements the rest of ticket 6465.
  2459. - Introduce new circuitmux_t storing the queue of circuits for
  2460. a channel; this encapsulates and abstracts the queue logic and
  2461. circuit selection policy, and allows the latter to be overridden
  2462. easily by switching out a policy object. The existing EWMA behavior
  2463. is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
  2464. o New build requirements:
  2465. - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
  2466. strongly recommended.
  2467. - Tor maintainers now require Automake version 1.9 or later to build
  2468. Tor from the Git repository. (Automake is not required when building
  2469. from a source distribution.)
  2470. o Minor features (protocol):
  2471. - No longer include the "opt" prefix when generating routerinfos
  2472. or v2 directories: it has been needless since Tor 0.1.2. Closes
  2473. ticket 5124.
  2474. - Reject EXTEND cells sent to nonexistent streams. According to the
  2475. spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
  2476. we were only checking for stream IDs that were currently in use.
  2477. Found while hunting for more instances of bug 6271. Bugfix on
  2478. 0.0.2pre8, which introduced incremental circuit construction.
  2479. - Tor relays and clients now support a better CREATE/EXTEND cell
  2480. format, allowing the sender to specify multiple address, identity,
  2481. and handshake types. Implements Robert Ransom's proposal 200;
  2482. closes ticket 7199.
  2483. - Reject as invalid most directory objects containing a NUL.
  2484. Belt-and-suspender fix for bug 8037.
  2485. o Minor features (security):
  2486. - Clear keys and key-derived material left on the stack in
  2487. rendservice.c and rendclient.c. Check return value of
  2488. crypto_pk_write_private_key_to_string() in rend_service_load_keys().
  2489. These fixes should make us more forward-secure against cold-boot
  2490. attacks and the like. Fixes bug 2385.
  2491. - Use our own weak RNG when we need a weak RNG. Windows's rand() and
  2492. Irix's random() only return 15 bits; Solaris's random() returns more
  2493. bits but its RAND_MAX says it only returns 15, and so on. Motivated
  2494. by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
  2495. o Minor features (control protocol):
  2496. - Add a "GETINFO signal/names" control port command. Implements
  2497. ticket 3842.
  2498. - Provide default values for all options via "GETINFO config/defaults".
  2499. Implements ticket 4971.
  2500. - Allow an optional $ before the node identity digest in the
  2501. controller command GETINFO ns/id/<identity>, for consistency with
  2502. md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
  2503. - Add CACHED keyword to ADDRMAP events in the control protocol
  2504. to indicate whether a DNS result will be cached or not. Resolves
  2505. ticket 8596.
  2506. - Generate bootstrapping status update events correctly when fetching
  2507. microdescriptors. Fixes bug 9927.
  2508. o Minor features (path selection):
  2509. - When deciding whether we have enough descriptors to build circuits,
  2510. instead of looking at raw relay counts, look at which fraction
  2511. of (bandwidth-weighted) paths we're able to build. This approach
  2512. keeps clients from building circuits if their paths are likely to
  2513. stand out statistically. The default fraction of paths needed is
  2514. taken from the consensus directory; you can override it with the
  2515. new PathsNeededToBuildCircuits option. Fixes ticket 5956.
  2516. - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
  2517. and we have GeoIP information, also exclude all nodes with unknown
  2518. countries "??" and "A1". This behavior is controlled by the
  2519. new GeoIPExcludeUnknown option: you can make such nodes always
  2520. excluded with "GeoIPExcludeUnknown 1", and disable the feature
  2521. with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
  2522. gets you the default behavior. Implements feature 7706.
  2523. o Minor features (hidden services):
  2524. - Improve circuit build timeout handling for hidden services.
  2525. In particular: adjust build timeouts more accurately depending
  2526. upon the number of hop-RTTs that a particular circuit type
  2527. undergoes. Additionally, launch intro circuits in parallel
  2528. if they timeout, and take the first one to reply as valid.
  2529. - The Tor client now ignores sub-domain components of a .onion
  2530. address. This change makes HTTP "virtual" hosting
  2531. possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
  2532. http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
  2533. hosted on the same hidden service. Implements proposal 204.
  2534. - Enable Tor to read configuration, state, and key information from
  2535. a FIFO. Previously Tor would only read from files with a positive
  2536. stat.st_size. Code from meejah; fixes bug 6044.
  2537. o Minor features (clients):
  2538. - Teach bridge-using clients to avoid 0.2.2.x bridges when making
  2539. microdescriptor-related dir requests, and only fall back to normal
  2540. descriptors if none of their bridges can handle microdescriptors
  2541. (as opposed to the fix in ticket 4013, which caused them to fall
  2542. back to normal descriptors if *any* of their bridges preferred
  2543. them). Resolves ticket 4994.
  2544. - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
  2545. TCP ports to forward. In the past it only accepted two ports:
  2546. the ORPort and the DirPort.
  2547. o Minor features (protecting client timestamps):
  2548. - Clients no longer send timestamps in their NETINFO cells. These were
  2549. not used for anything, and they provided one small way for clients
  2550. to be distinguished from each other as they moved from network to
  2551. network or behind NAT. Implements part of proposal 222.
  2552. - Clients now round timestamps in INTRODUCE cells down to the nearest
  2553. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  2554. if it's set to "auto" and the feature is disabled in the consensus,
  2555. the timestamp is sent as 0 instead. Implements part of proposal 222.
  2556. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  2557. a big deal from a security point of view, but it achieves no actual
  2558. good purpose, and isn't needed. Implements part of proposal 222.
  2559. - Reduce down accuracy of timestamps in hidden service descriptors.
  2560. Implements part of proposal 222.
  2561. o Minor features (bridges):
  2562. - Make bridge relays check once a minute for whether their IP
  2563. address has changed, rather than only every 15 minutes. Resolves
  2564. bugs 1913 and 1992.
  2565. - Bridge statistics now count bridge clients connecting over IPv6:
  2566. bridge statistics files now list "bridge-ip-versions" and
  2567. extra-info documents list "geoip6-db-digest". The control protocol
  2568. "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
  2569. implementation by "shkoo", addressing ticket 5055.
  2570. - Add a new torrc option "ServerTransportListenAddr" to let bridge
  2571. operators select the address where their pluggable transports will
  2572. listen for connections. Resolves ticket 7013.
  2573. - Randomize the lifetime of our SSL link certificate, so censors can't
  2574. use the static value for filtering Tor flows. Resolves ticket 8443;
  2575. related to ticket 4014 which was included in 0.2.2.33.
  2576. o Minor features (relays):
  2577. - Option OutboundBindAddress can be specified multiple times and
  2578. accepts IPv6 addresses. Resolves ticket 6876.
  2579. o Minor features (IPv6, client side):
  2580. - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
  2581. prefer to hand out virtual IPv6 addresses, since there are more of
  2582. them and we can't run out. To override this behavior and make IPv4
  2583. addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
  2584. or DNSPort you're using for resolving. Implements ticket 7571.
  2585. - AutomapHostsOnResolve responses are now randomized, to avoid
  2586. annoying situations where Tor is restarted and applications
  2587. connect to the wrong addresses.
  2588. - Never try more than 1000 times to pick a new virtual address when
  2589. AutomapHostsOnResolve is set. That's good enough so long as we
  2590. aren't close to handing out our entire virtual address space;
  2591. if you're getting there, it's best to switch to IPv6 virtual
  2592. addresses anyway.
  2593. o Minor features (IPv6, relay/authority side):
  2594. - New config option "AuthDirHasIPv6Connectivity 1" that directory
  2595. authorities should set if they have IPv6 connectivity and want to
  2596. do reachability tests for IPv6 relays. Implements feature 5974.
  2597. - A relay with an IPv6 OR port now sends that address in NETINFO
  2598. cells (in addition to its other address). Implements ticket 6364.
  2599. o Minor features (directory authorities):
  2600. - Directory authorities no long accept descriptors for any version of
  2601. Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
  2602. These versions are insecure, unsupported, or both. Implements
  2603. ticket 6789.
  2604. - When directory authorities are computing thresholds for flags,
  2605. never let the threshold for the Fast flag fall below 4096
  2606. bytes. Also, do not consider nodes with extremely low bandwidths
  2607. when deciding thresholds for various directory flags. This change
  2608. should raise our threshold for Fast relays, possibly in turn
  2609. improving overall network performance; see ticket 1854. Resolves
  2610. ticket 8145.
  2611. - Directory authorities now include inside each vote a statement of
  2612. the performance thresholds they used when assigning flags.
  2613. Implements ticket 8151.
  2614. - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
  2615. in directory authority votes to describe whether they have enough
  2616. measured bandwidths to ignore advertised (relay descriptor)
  2617. bandwidth claims. Resolves ticket 8711.
  2618. o Minor features (path bias detection):
  2619. - Path Use Bias: Perform separate accounting for successful circuit
  2620. use. Keep separate statistics on stream attempt rates versus stream
  2621. success rates for each guard. Provide configurable thresholds to
  2622. determine when to emit log messages or disable use of guards that
  2623. fail too many stream attempts. Resolves ticket 7802.
  2624. - Create three levels of Path Bias log messages, as opposed to just
  2625. two. These are configurable via consensus as well as via the torrc
  2626. options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
  2627. The default values are 0.70, 0.50, and 0.30 respectively.
  2628. - Separate the log message levels from the decision to drop guards,
  2629. which also is available via torrc option PathBiasDropGuards.
  2630. PathBiasDropGuards still defaults to 0 (off).
  2631. - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
  2632. in combination with PathBiasExtremeRate.
  2633. - Increase the default values for PathBiasScaleThreshold and
  2634. PathBiasCircThreshold from (200, 20) to (300, 150).
  2635. - Add in circuit usage accounting to path bias. If we try to use a
  2636. built circuit but fail for any reason, it counts as path bias.
  2637. Certain classes of circuits where the adversary gets to pick your
  2638. destination node are exempt from this accounting. Usage accounting
  2639. can be specifically disabled via consensus parameter or torrc.
  2640. - Convert all internal path bias state to double-precision floating
  2641. point, to avoid roundoff error and other issues.
  2642. - Only record path bias information for circuits that have completed
  2643. *two* hops. Assuming end-to-end tagging is the attack vector, this
  2644. makes us more resilient to ambient circuit failure without any
  2645. detection capability loss.
  2646. o Minor features (build):
  2647. - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
  2648. dhill. Resolves ticket 6982.
  2649. - Compile on win64 using mingw64. Fixes bug 7260; patches from
  2650. "yayooo".
  2651. - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
  2652. separate error codes; or at least, don't break for that reason.
  2653. Fixes bug 7935. Reported by "oftc_must_be_destroyed".
  2654. o Build improvements (autotools):
  2655. - Warn if building on a platform with an unsigned time_t: there
  2656. are too many places where Tor currently assumes that time_t can
  2657. hold negative values. We'd like to fix them all, but probably
  2658. some will remain.
  2659. - Do not report status verbosely from autogen.sh unless the -v flag
  2660. is specified. Fixes issue 4664. Patch from Onizuka.
  2661. - Detect and reject attempts to build Tor with threading support
  2662. when OpenSSL has been compiled without threading support.
  2663. Fixes bug 6673.
  2664. - Try to detect if we are ever building on a platform where
  2665. memset(...,0,...) does not set the value of a double to 0.0. Such
  2666. platforms are permitted by the C standard, though in practice
  2667. they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
  2668. currently support them, but it's better to detect them and fail
  2669. than to perform erroneously.
  2670. - We no longer warn so much when generating manpages from their
  2671. asciidoc source.
  2672. - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
  2673. the signs of types during autoconf. This is better than our old
  2674. approach, which didn't work when cross-compiling.
  2675. o Minor features (log messages, warnings):
  2676. - Detect when we're running with a version of OpenSSL other than the
  2677. one we compiled with. This conflict has occasionally given people
  2678. hard-to-track-down errors.
  2679. - Warn users who run hidden services on a Tor client with
  2680. UseEntryGuards disabled that their hidden services will be
  2681. vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
  2682. attack which motivated Tor to support entry guards in the first
  2683. place). Resolves ticket 6889.
  2684. - Warn when we are binding low ports when hibernation is enabled;
  2685. previously we had warned when we were _advertising_ low ports with
  2686. hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
  2687. - Issue a warning when running with the bufferevents backend enabled.
  2688. It's still not stable, and people should know that they're likely
  2689. to hit unexpected problems. Closes ticket 9147.
  2690. o Minor features (log messages, notices):
  2691. - Refactor resolve_my_address() so it returns the method by which we
  2692. decided our public IP address (explicitly configured, resolved from
  2693. explicit hostname, guessed from interfaces, learned by gethostname).
  2694. Now we can provide more helpful log messages when a relay guesses
  2695. its IP address incorrectly (e.g. due to unexpected lines in
  2696. /etc/hosts). Resolves ticket 2267.
  2697. - Track how many "TAP" and "NTor" circuit handshake requests we get,
  2698. and how many we complete, and log it every hour to help relay
  2699. operators follow trends in network load. Addresses ticket 9658.
  2700. o Minor features (log messages, diagnostics):
  2701. - If we fail to free a microdescriptor because of bug 7164, log
  2702. the filename and line number from which we tried to free it.
  2703. - We compute the overhead from passing onionskins back and forth to
  2704. cpuworkers, and report it when dumping statistics in response to
  2705. SIGUSR1. Supports ticket 7291.
  2706. - Add another diagnostic to the heartbeat message: track and log
  2707. overhead that TLS is adding to the data we write. If this is
  2708. high, we are sending too little data to SSL_write at a time.
  2709. Diagnostic for bug 7707.
  2710. - Log packaged cell fullness as part of the heartbeat message.
  2711. Diagnosis to try to determine the extent of bug 7743.
  2712. - Add more detail to a log message about relaxed timeouts, to help
  2713. track bug 7799.
  2714. - When learning a fingerprint for a bridge, log its corresponding
  2715. transport type. Implements ticket 7896.
  2716. - Warn more aggressively when flushing microdescriptors to a
  2717. microdescriptor cache fails, in an attempt to mitigate bug 8031,
  2718. or at least make it more diagnosable.
  2719. - Improve the log message when "Bug/attack: unexpected sendme cell
  2720. from client" occurs, to help us track bug 8093.
  2721. - Improve debugging output to help track down bug 8185 ("Bug:
  2722. outgoing relay cell has n_chan==NULL. Dropping.")
  2723. o Minor features (log messages, quieter bootstrapping):
  2724. - Log fewer lines at level "notice" about our OpenSSL and Libevent
  2725. versions and capabilities when everything is going right. Resolves
  2726. part of ticket 6736.
  2727. - Omit the first heartbeat log message, because it never has anything
  2728. useful to say, and it clutters up the bootstrapping messages.
  2729. Resolves ticket 6758.
  2730. - Don't log about reloading the microdescriptor cache at startup. Our
  2731. bootstrap warnings are supposed to tell the user when there's a
  2732. problem, and our bootstrap notices say when there isn't. Resolves
  2733. ticket 6759; bugfix on 0.2.2.6-alpha.
  2734. - Don't log "I learned some more directory information" when we're
  2735. reading cached directory information. Reserve it for when new
  2736. directory information arrives in response to a fetch. Resolves
  2737. ticket 6760.
  2738. - Don't complain about bootstrapping problems while hibernating.
  2739. These complaints reflect a general code problem, but not one
  2740. with any problematic effects (no connections are actually
  2741. opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
  2742. o Minor features (testing):
  2743. - In our testsuite, create temporary directories with a bit more
  2744. entropy in their name to make name collisions less likely. Fixes
  2745. bug 8638.
  2746. - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
  2747. (P-256) Diffie-Hellman handshakes to src/or/bench.
  2748. - Add benchmark functions to test onion handshake performance.
  2749. o Renamed options:
  2750. - The DirServer option is now DirAuthority, for consistency with
  2751. current naming patterns. You can still use the old DirServer form.
  2752. o Minor bugfixes (protocol):
  2753. - Fix the handling of a TRUNCATE cell when it arrives while the
  2754. circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
  2755. - When a Tor client gets a "truncated" relay cell, the first byte of
  2756. its payload specifies why the circuit was truncated. We were
  2757. ignoring this 'reason' byte when tearing down the circuit, resulting
  2758. in the controller not being told why the circuit closed. Now we
  2759. pass the reason from the truncated cell to the controller. Bugfix
  2760. on 0.1.2.3-alpha; fixes bug 7039.
  2761. - Fix a misframing issue when reading the version numbers in a
  2762. VERSIONS cell. Previously we would recognize [00 01 00 02] as
  2763. 'version 1, version 2, and version 0x100', when it should have
  2764. only included versions 1 and 2. Fixes bug 8059; bugfix on
  2765. 0.2.0.10-alpha. Reported pseudonymously.
  2766. - Make the format and order of STREAM events for DNS lookups
  2767. consistent among the various ways to launch DNS lookups. Fixes
  2768. bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
  2769. o Minor bugfixes (syscalls and disk interaction):
  2770. - Always check the return values of functions fcntl() and
  2771. setsockopt(). We don't believe these are ever actually failing in
  2772. practice, but better safe than sorry. Also, checking these return
  2773. values should please analysis tools like Coverity. Patch from
  2774. 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
  2775. - Avoid double-closing the listener socket in our socketpair()
  2776. replacement (used on Windows) in the case where the addresses on
  2777. our opened sockets don't match what we expected. Fixes bug 9400;
  2778. bugfix on 0.0.2pre7. Found by Coverity.
  2779. - Correctly store microdescriptors and extrainfo descriptors that
  2780. include an internal NUL byte. Fixes bug 8037; bugfix on
  2781. 0.2.0.1-alpha. Bug reported by "cypherpunks".
  2782. - If for some reason we fail to write a microdescriptor while
  2783. rebuilding the cache, do not let the annotations from that
  2784. microdescriptor linger in the cache file, and do not let the
  2785. microdescriptor stay recorded as present in its old location.
  2786. Fixes bug 9047; bugfix on 0.2.2.6-alpha.
  2787. - Use direct writes rather than stdio when building microdescriptor
  2788. caches, in an attempt to mitigate bug 8031, or at least make it
  2789. less common.
  2790. o Minor fixes (config options):
  2791. - Warn and fail if a server is configured not to advertise any
  2792. ORPorts at all. (We need *something* to put in our descriptor,
  2793. or we just won't work.)
  2794. - Behave correctly when the user disables LearnCircuitBuildTimeout
  2795. but doesn't tell us what they would like the timeout to be. Fixes
  2796. bug 6304; bugfix on 0.2.2.14-alpha.
  2797. - Rename the (internal-use-only) UsingTestingNetworkDefaults option
  2798. to start with a triple-underscore so the controller won't touch it.
  2799. Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
  2800. - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
  2801. so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
  2802. - When autodetecting the number of CPUs, use the number of available
  2803. CPUs in preference to the number of configured CPUs. Inform the
  2804. user if this reduces the number of available CPUs. Fixes bug 8002;
  2805. bugfix on 0.2.3.1-alpha.
  2806. - Command-line option "--version" implies "--quiet". Fixes bug 6997.
  2807. - Make it an error when you set EntryNodes but disable UseGuardNodes,
  2808. since it will (surprisingly to some users) ignore EntryNodes. Fixes
  2809. bug 8180; bugfix on 0.2.3.11-alpha.
  2810. - Avoid overflows when the user sets MaxCircuitDirtiness to a
  2811. ridiculously high value, by imposing a (ridiculously high) 30-day
  2812. maximum on MaxCircuitDirtiness.
  2813. o Minor bugfixes (control protocol):
  2814. - Stop sending a stray "(null)" in some cases for the server status
  2815. "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
  2816. on 0.1.2.6-alpha.
  2817. - The ADDRMAP command can no longer generate an ill-formed error
  2818. code on a failed MAPADDRESS. It now says "internal" rather than
  2819. an English sentence fragment with spaces in the middle. Bugfix on
  2820. Tor 0.2.0.19-alpha.
  2821. o Minor bugfixes (clients / edges):
  2822. - When we receive a RELAY_END cell with the reason DONE, or with no
  2823. reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
  2824. status as "connection refused". Previously we reported these cases
  2825. as success but then immediately closed the connection. Fixes bug
  2826. 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
  2827. - If the guard we choose first doesn't answer, we would try the
  2828. second guard, but once we connected to the second guard we would
  2829. abandon it and retry the first one, slowing down bootstrapping.
  2830. The fix is to treat all our initially chosen guards as acceptable
  2831. to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
  2832. - When choosing which stream on a formerly stalled circuit to wake
  2833. first, make better use of the platform's weak RNG. Previously,
  2834. we had been using the % ("modulo") operator to try to generate a
  2835. 1/N chance of picking each stream, but this behaves badly with
  2836. many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
  2837. 0.2.2.20-alpha.
  2838. o Minor bugfixes (path bias detection):
  2839. - If the state file's path bias counts are invalid (presumably from a
  2840. buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
  2841. additional checks and log messages to the scaling of Path Bias
  2842. counts, in case there still are remaining issues with scaling.
  2843. Should help resolve bug 8235.
  2844. - Prevent rounding error in path bias counts when scaling
  2845. them down, and use the correct scale factor default. Also demote
  2846. some path bias related log messages down a level and make others
  2847. less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
  2848. - Remove a source of rounding error during path bias count scaling;
  2849. don't count cannibalized circuits as used for path bias until we
  2850. actually try to use them; and fix a circuit_package_relay_cell()
  2851. warning message about n_chan==NULL. Fixes bug 7802.
  2852. - Paste the description for PathBias parameters from the man
  2853. page into or.h, so the code documents them too. Fixes bug 7982;
  2854. bugfix on 0.2.3.17-beta.
  2855. o Minor bugfixes (relays):
  2856. - Stop trying to resolve our hostname so often (e.g. every time we
  2857. think about doing a directory fetch). Now we reuse the cached
  2858. answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
  2859. and 2410 (bugfix on 0.1.2.2-alpha).
  2860. - When examining the list of network interfaces to find our address,
  2861. do not consider non-running or disabled network interfaces. Fixes
  2862. bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
  2863. o Minor bugfixes (blocking resistance):
  2864. - Only disable TLS session ticket support when running as a TLS
  2865. server. Now clients will blend better with regular Firefox
  2866. connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
  2867. o Minor bugfixes (IPv6):
  2868. - Use square brackets around IPv6 addresses in numerous places
  2869. that needed them, including log messages, HTTPS CONNECT proxy
  2870. requests, TransportProxy statefile entries, and pluggable transport
  2871. extra-info lines. Fixes bug 7011; patch by David Fifield.
  2872. o Minor bugfixes (directory authorities):
  2873. - Reject consensus votes with more than 64 known-flags. We aren't even
  2874. close to that limit yet, and our code doesn't handle it correctly.
  2875. Fixes bug 6833; bugfix on 0.2.0.1-alpha.
  2876. - Correctly handle votes with more than 31 flags. Fixes bug 6853;
  2877. bugfix on 0.2.0.3-alpha.
  2878. o Minor bugfixes (memory leaks):
  2879. - Avoid leaking memory if we fail to compute a consensus signature
  2880. or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
  2881. - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
  2882. on 0.2.1.1-alpha; fixes bug 7816.
  2883. - Fix a memory leak during safe-cookie controller authentication.
  2884. Bugfix on 0.2.3.13-alpha; fixes bug 7816.
  2885. - Free some more still-in-use memory at exit, to make hunting for
  2886. memory leaks easier. Resolves bug 7029.
  2887. o Minor bugfixes (code correctness):
  2888. - Increase the width of the field used to remember a connection's
  2889. link protocol version to two bytes. Harmless for now, since the
  2890. only currently recognized versions are one byte long. Reported
  2891. pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
  2892. - Fix a crash when debugging unit tests on Windows: deallocate a
  2893. shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
  2894. bugfix on 0.2.2.17-alpha. Reported by "ultramage".
  2895. - When detecting the largest possible file descriptor (in order to
  2896. close all file descriptors when launching a new program), actually
  2897. use _SC_OPEN_MAX. The old code for doing this was very, very broken.
  2898. Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
  2899. is CID 743383.
  2900. - Avoid a crash if we fail to generate an extrainfo descriptor.
  2901. Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
  2902. this is CID 718634.
  2903. - Avoid an off-by-one error when checking buffer boundaries when
  2904. formatting the exit status of a pluggable transport helper.
  2905. This is probably not an exploitable bug, but better safe than
  2906. sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
  2907. Pedro Ribeiro.
  2908. - Get rid of a couple of harmless clang warnings, where we compared
  2909. enums to ints. These warnings are newly introduced in clang 3.2.
  2910. o Minor bugfixes (code cleanliness):
  2911. - Avoid use of reserved identifiers in our C code. The C standard
  2912. doesn't like us declaring anything that starts with an
  2913. underscore, so let's knock it off before we get in trouble. Fix
  2914. for bug 1031; bugfix on the first Tor commit.
  2915. - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
  2916. with large values. This situation was untriggered, but nevertheless
  2917. incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
  2918. - Fix an impossible buffer overrun in the AES unit tests. Fixes
  2919. bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
  2920. - Fix handling of rendezvous client authorization types over 8.
  2921. Fixes bug 6861; bugfix on 0.2.1.5-alpha.
  2922. - Remove a couple of extraneous semicolons that were upsetting the
  2923. cparser library. Patch by Christian Grothoff. Fixes bug 7115;
  2924. bugfix on 0.2.2.1-alpha.
  2925. - When complaining about a client port on a public address, log
  2926. which address we're complaining about. Fixes bug 4020; bugfix on
  2927. 0.2.3.3-alpha. Patch by Tom Fitzhenry.
  2928. o Minor bugfixes (log messages, warnings):
  2929. - If we encounter a write failure on a SOCKS connection before we
  2930. finish our SOCKS handshake, don't warn that we closed the
  2931. connection before we could send a SOCKS reply. Fixes bug 8427;
  2932. bugfix on 0.1.0.1-rc.
  2933. - Fix a directory authority warn caused when we have a large amount
  2934. of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
  2935. - Downgrade "Failed to hand off onionskin" messages to "debug"
  2936. severity, since they're typically redundant with the "Your computer
  2937. is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
  2938. - Avoid spurious warnings when configuring multiple client ports of
  2939. which only some are nonlocal. Previously, we had claimed that some
  2940. were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
  2941. 0.2.3.3-alpha.
  2942. o Minor bugfixes (log messages, other):
  2943. - Fix log messages and comments to avoid saying "GMT" when we mean
  2944. "UTC". Fixes bug 6113.
  2945. - When rejecting a configuration because we were unable to parse a
  2946. quoted string, log an actual error message. Fixes bug 7950; bugfix
  2947. on 0.2.0.16-alpha.
  2948. - Correctly recognize that [::1] is a loopback address. Fixes
  2949. bug 8377; bugfix on 0.2.1.3-alpha.
  2950. - Don't log inappropriate heartbeat messages when hibernating: a
  2951. hibernating node is _expected_ to drop out of the consensus,
  2952. decide it isn't bootstrapped, and so forth. Fixes bug 7302;
  2953. bugfix on 0.2.3.1-alpha.
  2954. - Eliminate several instances where we use "Nickname=ID" to refer to
  2955. nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
  2956. "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
  2957. on 0.2.3.21-rc.
  2958. o Minor bugfixes (build):
  2959. - Fix some bugs in tor-fw-helper-natpmp when trying to build and
  2960. run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
  2961. Fixes bug 7280; bugfix on 0.2.3.1-alpha.
  2962. o Documentation fixes:
  2963. - Make the torify manpage no longer refer to tsocks; torify hasn't
  2964. supported tsocks since 0.2.3.14-alpha.
  2965. - Make the tor manpage no longer reference tsocks.
  2966. - Fix the GeoIPExcludeUnknown documentation to refer to
  2967. ExcludeExitNodes rather than the currently nonexistent
  2968. ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
  2969. - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
  2970. 0.2.3.14-alpha.
  2971. - Say "KBytes" rather than "KB" in the man page (for various values
  2972. of K), to further reduce confusion about whether Tor counts in
  2973. units of memory or fractions of units of memory. Resolves ticket 7054.
  2974. - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
  2975. names match. Fixes bug 7768.
  2976. - Fix the documentation of HeartbeatPeriod to say that the heartbeat
  2977. message is logged at notice, not at info.
  2978. - Clarify the usage and risks of setting the ContactInfo torrc line
  2979. for your relay or bridge. Resolves ticket 9854.
  2980. - Add anchors to the manpage so we can link to the html version of
  2981. the documentation for specific options. Resolves ticket 9866.
  2982. - Replace remaining references to DirServer in man page and
  2983. log entries. Resolves ticket 10124.
  2984. o Removed features:
  2985. - Stop exporting estimates of v2 and v3 directory traffic shares
  2986. in extrainfo documents. They were unneeded and sometimes inaccurate.
  2987. Also stop exporting any v2 directory request statistics. Resolves
  2988. ticket 5823.
  2989. - Drop support for detecting and warning about versions of Libevent
  2990. before 1.3e. Nothing reasonable ships with them any longer; warning
  2991. the user about them shouldn't be needed. Resolves ticket 6826.
  2992. - Now that all versions before 0.2.2.x are disallowed, we no longer
  2993. need to work around their missing features. Remove a bunch of
  2994. compatibility code.
  2995. o Removed files:
  2996. - The tor-tsocks.conf is no longer distributed or installed. We
  2997. recommend that tsocks users use torsocks instead. Resolves
  2998. ticket 8290.
  2999. - Remove some of the older contents of doc/ as obsolete; move others
  3000. to torspec.git. Fixes bug 8965.
  3001. o Code simplification:
  3002. - Avoid using character buffers when constructing most directory
  3003. objects: this approach was unwieldy and error-prone. Instead,
  3004. build smartlists of strings, and concatenate them when done.
  3005. - Rename "isin" functions to "contains", for grammar. Resolves
  3006. ticket 5285.
  3007. - Rename Tor's logging function log() to tor_log(), to avoid conflicts
  3008. with the natural logarithm function from the system libm. Resolves
  3009. ticket 7599.
  3010. - Start using OpenBSD's implementation of queue.h, so that we don't
  3011. need to hand-roll our own pointer and list structures whenever we
  3012. need them. (We can't rely on a sys/queue.h, since some operating
  3013. systems don't have them, and the ones that do have them don't all
  3014. present the same extensions.)
  3015. - Start using OpenBSD's implementation of queue.h (originally by
  3016. Niels Provos).
  3017. - Enhance our internal sscanf replacement so that we can eliminate
  3018. the last remaining uses of the system sscanf. (Though those uses
  3019. of sscanf were safe, sscanf itself is generally error prone, so
  3020. we want to eliminate when we can.) Fixes ticket 4195 and Coverity
  3021. CID 448.
  3022. - Replace all calls to snprintf() outside of src/ext with
  3023. tor_snprintf(). Also remove the #define to replace snprintf with
  3024. _snprintf on Windows; they have different semantics, and all of
  3025. our callers should be using tor_snprintf() anyway. Fixes bug 7304.
  3026. o Refactoring:
  3027. - Add a wrapper function for the common "log a message with a
  3028. rate-limit" case.
  3029. - Split the onion.c file into separate modules for the onion queue
  3030. and the different handshakes it supports.
  3031. - Move the client-side address-map/virtual-address/DNS-cache code
  3032. out of connection_edge.c into a new addressmap.c module.
  3033. - Move the entry node code from circuitbuild.c to its own file.
  3034. - Move the circuit build timeout tracking code from circuitbuild.c
  3035. to its own file.
  3036. - Source files taken from other packages now reside in src/ext;
  3037. previously they were scattered around the rest of Tor.
  3038. - Move the generic "config" code into a new file, and have "config.c"
  3039. hold only torrc- and state-related code. Resolves ticket 6823.
  3040. - Move the core of our "choose a weighted element at random" logic
  3041. into its own function, and give it unit tests. Now the logic is
  3042. testable, and a little less fragile too.
  3043. - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
  3044. - Move last_reachable and testing_since from routerinfo_t to node_t.
  3045. Implements ticket 5529.
  3046. - Add replaycache_t structure, functions and unit tests, then refactor
  3047. rend_service_introduce() to be more clear to read, improve, debug,
  3048. and test. Resolves bug 6177.
  3049. o Removed code:
  3050. - Remove some now-needless code that tried to aggressively flush
  3051. OR connections as data was added to them. Since 0.2.0.1-alpha, our
  3052. cell queue logic has saved us from the failure mode that this code
  3053. was supposed to prevent. Removing this code will limit the number
  3054. of baroque control flow paths through Tor's network logic. Reported
  3055. pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
  3056. - Remove unused code for parsing v1 directories and "running routers"
  3057. documents. Fixes bug 6887.
  3058. - Remove the marshalling/unmarshalling code for sending requests to
  3059. cpuworkers over a socket, and instead just send structs. The
  3060. recipient will always be the same Tor binary as the sender, so
  3061. any encoding is overkill.
  3062. - Remove the testing_since field of node_t, which hasn't been used
  3063. for anything since 0.2.0.9-alpha.
  3064. - Finally remove support for malloc_good_size and malloc_usable_size.
  3065. We had hoped that these functions would let us eke a little more
  3066. memory out of our malloc implementation. Unfortunately, the only
  3067. implementations that provided these functions are also ones that
  3068. are already efficient about not overallocation: they never got us
  3069. more than 7 or so bytes per allocation. Removing them saves us a
  3070. little code complexity and a nontrivial amount of build complexity.
  3071. Changes in version 0.2.3.25 - 2012-11-19
  3072. The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
  3073. Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
  3074. Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
  3075. programmer, and friend. Unstinting in his dedication to the cause of
  3076. freedom, he inspired and helped many of us as we began our work on
  3077. anonymity, and inspires us still. Please honor his memory by writing
  3078. software to protect people's freedoms, and by helping others to do so.
  3079. Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
  3080. significantly reduced directory overhead (via microdescriptors),
  3081. enormous crypto performance improvements for fast relays on new
  3082. enough hardware, a new v3 TLS handshake protocol that can better
  3083. resist fingerprinting, support for protocol obfuscation plugins (aka
  3084. pluggable transports), better scalability for hidden services, IPv6
  3085. support for bridges, performance improvements like allowing clients
  3086. to skip the first round-trip on the circuit ("optimistic data") and
  3087. refilling token buckets more often, a new "stream isolation" design
  3088. to isolate different applications on different circuits, and many
  3089. stability, security, and privacy fixes.
  3090. Major features (v3 directory protocol):
  3091. - Clients now use microdescriptors instead of regular descriptors
  3092. to build circuits. Microdescriptors are authority-generated
  3093. summaries of regular descriptors' contents, designed to change very
  3094. rarely (see proposal 158 for details). This feature is designed
  3095. to save bandwidth, especially for clients on slow internet
  3096. connections. Use "UseMicrodescriptors 0" to disable it.
  3097. - Caches now download, cache, and serve microdescriptors, as well
  3098. as multiple "flavors" of the consensus, including a flavor that
  3099. describes microdescriptors.
  3100. o Major features (build hardening):
  3101. - Enable gcc and ld hardening by default. Resolves ticket 5210.
  3102. o Major features (relay scaling):
  3103. - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
  3104. instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
  3105. vectorized AES implementations as appropriate. These can be much,
  3106. much faster than other AES implementations.
  3107. - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
  3108. implementation. It makes AES_CTR about 7% faster than our old one
  3109. (which was about 10% faster than the one OpenSSL used to provide).
  3110. Resolves ticket 4526.
  3111. - Use OpenSSL's EVP interface for AES encryption, so that all AES
  3112. operations can use hardware acceleration (if present). Resolves
  3113. ticket 4442.
  3114. - Unconditionally use OpenSSL's AES implementation instead of our
  3115. old built-in one. OpenSSL's AES has been better for a while, and
  3116. relatively few servers should still be on any version of OpenSSL
  3117. that doesn't have good optimized assembly AES.
  3118. o Major features (blocking resistance):
  3119. - Update TLS cipher list to match Firefox 8 and later. Resolves
  3120. ticket 4744.
  3121. - Remove support for clients falsely claiming to support standard
  3122. ciphersuites that they can actually provide. As of modern OpenSSL
  3123. versions, it's not necessary to fake any standard ciphersuite,
  3124. and doing so prevents us from using better ciphersuites in the
  3125. future, since servers can't know whether an advertised ciphersuite
  3126. is really supported or not. Some hosts -- notably, ones with very
  3127. old versions of OpenSSL or where OpenSSL has been built with ECC
  3128. disabled -- will stand out because of this change; TBB users should
  3129. not be affected. Implements the client side of proposal 198.
  3130. - Implement a new handshake protocol (v3) for authenticating Tors to
  3131. each other over TLS. It should be more resistant to fingerprinting
  3132. than previous protocols, and should require less TLS hacking for
  3133. future Tor implementations. Implements proposal 176.
  3134. - Allow variable-length padding cells, to disguise the length of
  3135. Tor's TLS records. Implements part of proposal 184.
  3136. - While we're trying to bootstrap, record how many TLS connections
  3137. fail in each state, and report which states saw the most failures
  3138. in response to any bootstrap failures. This feature may speed up
  3139. diagnosis of censorship events. Implements ticket 3116.
  3140. o Major features (pluggable transports):
  3141. - Clients and bridges can now be configured to use a separate
  3142. "transport" proxy. This approach makes the censorship arms race
  3143. easier by allowing bridges to use protocol obfuscation plugins.
  3144. Implements proposal 180 (tickets 2841 and 3472).
  3145. o Major features (DoS resistance):
  3146. - Now that Tor 0.2.0.x is completely deprecated, enable the final
  3147. part of "Proposal 110: Avoiding infinite length circuits" by
  3148. refusing all circuit-extend requests that do not use a relay_early
  3149. cell. This change helps Tor resist a class of denial-of-service
  3150. attacks by limiting the maximum circuit length.
  3151. - Tear down the circuit if we get an unexpected SENDME cell. Clients
  3152. could use this trick to make their circuits receive cells faster
  3153. than our flow control would have allowed, or to gum up the network,
  3154. or possibly to do targeted memory denial-of-service attacks on
  3155. entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
  3156. from July 2002, before the release of Tor 0.0.0.
  3157. o Major features (hidden services):
  3158. - Adjust the number of introduction points that a hidden service
  3159. will try to maintain based on how long its introduction points
  3160. remain in use and how many introductions they handle. Fixes
  3161. part of bug 3825.
  3162. - Add a "tor2web mode" for clients that want to connect to hidden
  3163. services non-anonymously (and possibly more quickly). As a safety
  3164. measure to try to keep users from turning this on without knowing
  3165. what they are doing, tor2web mode must be explicitly enabled at
  3166. compile time, and a copy of Tor compiled to run in tor2web mode
  3167. cannot be used as a normal Tor client. Implements feature 2553.
  3168. o Major features (IPv6):
  3169. - Clients can now connect to private bridges over IPv6. Bridges
  3170. still need at least one IPv4 address in order to connect to
  3171. other relays. Note that we don't yet handle the case where the
  3172. user has two bridge lines for the same bridge (one IPv4, one
  3173. IPv6). Implements parts of proposal 186.
  3174. o Major features (directory authorities):
  3175. - Use a more secure consensus parameter voting algorithm. Now at
  3176. least three directory authorities or a majority of them must
  3177. vote on a given parameter before it will be included in the
  3178. consensus. Implements proposal 178.
  3179. - Remove the artificially low cutoff of 20KB to guarantee the Fast
  3180. flag. In the past few years the average relay speed has picked
  3181. up, and while the "top 7/8 of the network get the Fast flag" and
  3182. "all relays with 20KB or more of capacity get the Fast flag" rules
  3183. used to have the same result, now the top 7/8 of the network has
  3184. a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
  3185. o Major features (performance):
  3186. - Exit nodes now accept and queue data on not-yet-connected streams.
  3187. Previously, the client wasn't allowed to send data until the
  3188. stream was connected, which slowed down all connections. This
  3189. change will enable clients to perform a "fast-start" on streams
  3190. and send data without having to wait for a confirmation that the
  3191. stream has opened. Patch from Ian Goldberg; implements the server
  3192. side of Proposal 174.
  3193. - When using an exit relay running 0.2.3.x, clients can now
  3194. "optimistically" send data before the exit relay reports that
  3195. the stream has opened. This saves a round trip when starting
  3196. connections where the client speaks first (such as web browsing).
  3197. This behavior is controlled by a consensus parameter (currently
  3198. disabled). To turn it on or off manually, use the "OptimisticData"
  3199. torrc option. Implements proposal 181; code by Ian Goldberg.
  3200. - Add a new TokenBucketRefillInterval option to refill token buckets
  3201. more frequently than once per second. This should improve network
  3202. performance, alleviate queueing problems, and make traffic less
  3203. bursty. Implements proposal 183; closes ticket 3630. Design by
  3204. Florian Tschorsch and Björn Scheuermann; implementation by
  3205. Florian Tschorsch.
  3206. - Raise the threshold of server descriptors needed (75%) and exit
  3207. server descriptors needed (50%) before we will declare ourselves
  3208. bootstrapped. This will make clients start building circuits a
  3209. little later, but makes the initially constructed circuits less
  3210. skewed and less in conflict with further directory fetches. Fixes
  3211. ticket 3196.
  3212. o Major features (relays):
  3213. - Relays now try regenerating and uploading their descriptor more
  3214. frequently if they are not listed in the consensus, or if the
  3215. version of their descriptor listed in the consensus is too
  3216. old. This fix should prevent situations where a server declines
  3217. to re-publish itself because it has done so too recently, even
  3218. though the authorities decided not to list its recent-enough
  3219. descriptor. Fix for bug 3327.
  3220. o Major features (stream isolation):
  3221. - You can now configure Tor so that streams from different
  3222. applications are isolated on different circuits, to prevent an
  3223. attacker who sees your streams as they leave an exit node from
  3224. linking your sessions to one another. To do this, choose some way
  3225. to distinguish the applications: have them connect to different
  3226. SocksPorts, or have one of them use SOCKS4 while the other uses
  3227. SOCKS5, or have them pass different authentication strings to the
  3228. SOCKS proxy. Then, use the new SocksPort syntax to configure the
  3229. degree of isolation you need. This implements Proposal 171.
  3230. - There's a new syntax for specifying multiple client ports (such as
  3231. SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
  3232. multiple *Port entries with full addr:port syntax on each.
  3233. The old *ListenAddress format is still supported, but you can't
  3234. mix it with the new *Port syntax.
  3235. o Major features (bufferevents):
  3236. - Tor can now optionally build with the "bufferevents" buffered IO
  3237. backend provided by Libevent 2. To use this feature, make sure you
  3238. have the latest possible version of Libevent, and pass the
  3239. --enable-bufferevents flag to configure when building Tor from
  3240. source. This feature will make our networking code more flexible,
  3241. let us stack layers on each other, and let us use more efficient
  3242. zero-copy transports where available.
  3243. - Add experimental support for running on Windows with IOCP and no
  3244. kernel-space socket buffers. This feature is controlled by a new
  3245. "UserspaceIOCPBuffers" config option (off by default), which has
  3246. no effect unless Tor has been built with bufferevents enabled,
  3247. you're running on Windows, and you've set "DisableIOCP 0". In the
  3248. long run, this may help solve or mitigate bug 98.
  3249. o Major features (path selection):
  3250. - The EntryNodes option can now include country codes like {de} or IP
  3251. addresses or network masks. Previously we had disallowed these
  3252. options because we didn't have an efficient way to keep the list up
  3253. to date. Addresses ticket 1982, but see bug 2798 for an unresolved
  3254. issue here.
  3255. o Major features (port forwarding):
  3256. - Add support for automatic port mapping on the many home routers
  3257. that support NAT-PMP or UPnP. To build the support code, you'll
  3258. need to have the libnatpnp library and/or the libminiupnpc library,
  3259. and you'll need to enable the feature specifically by passing
  3260. "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
  3261. it on, use the new PortForwarding option.
  3262. o Major features (logging):
  3263. - Add a new 'Heartbeat' log message type to periodically log a message
  3264. describing Tor's status at level Notice. This feature is meant for
  3265. operators who log at notice, and want to make sure that their Tor
  3266. server is still working. Implementation by George Kadianakis.
  3267. - Make logging resolution configurable with a new LogTimeGranularity
  3268. option, and change the default from 1 millisecond to 1 second.
  3269. Implements enhancement 1668.
  3270. o Major features (other):
  3271. - New "DisableNetwork" config option to prevent Tor from launching any
  3272. connections or accepting any connections except on a control port.
  3273. Bundles and controllers can set this option before letting Tor talk
  3274. to the rest of the network, for example to prevent any connections
  3275. to a non-bridge address. Packages like Orbot can also use this
  3276. option to instruct Tor to save power when the network is off.
  3277. - Try to use system facilities for enumerating local interface
  3278. addresses, before falling back to our old approach (which was
  3279. binding a UDP socket, and calling getsockname() on it). That
  3280. approach was scaring OS X users whose draconian firewall
  3281. software warned about binding to UDP sockets regardless of
  3282. whether packets were sent. Now we try to use getifaddrs(),
  3283. SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
  3284. system supports. Resolves ticket 1827.
  3285. - Add experimental support for a "defaults" torrc file to be parsed
  3286. before the regular torrc. Torrc options override the defaults file's
  3287. options in the same way that the command line overrides the torrc.
  3288. The SAVECONF controller command saves only those options which
  3289. differ between the current configuration and the defaults file. HUP
  3290. reloads both files. Implements task 4552.
  3291. o New directory authorities:
  3292. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  3293. authority. Closes ticket 5749.
  3294. o Security/privacy fixes:
  3295. - Avoid read-from-freed-memory and double-free bugs that could occur
  3296. when a DNS request fails while launching it. Fixes bug 6480;
  3297. bugfix on 0.2.0.1-alpha.
  3298. - Reject any attempt to extend to an internal address. Without
  3299. this fix, a router could be used to probe addresses on an internal
  3300. network to see whether they were accepting connections. Fixes bug
  3301. 6710; bugfix on 0.0.8pre1.
  3302. - Close any connection that sends unrecognized junk before the TLS
  3303. handshake. Solves an issue noted in bug 4369.
  3304. - The advertised platform of a relay now includes only its operating
  3305. system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
  3306. its service pack level (for Windows) or its CPU architecture
  3307. (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
  3308. can insert an extra string in the platform line by setting the
  3309. preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
  3310. - Disable TLS session tickets. OpenSSL's implementation was giving
  3311. our TLS session keys the lifetime of our TLS context objects, when
  3312. perfect forward secrecy would want us to discard anything that
  3313. could decrypt a link connection as soon as the link connection
  3314. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  3315. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  3316. - Tor tries to wipe potentially sensitive data after using it, so
  3317. that if some subsequent security failure exposes Tor's memory,
  3318. the damage will be limited. But we had a bug where the compiler
  3319. was eliminating these wipe operations when it decided that the
  3320. memory was no longer visible to a (correctly running) program,
  3321. hence defeating our attempt at defense in depth. We fix that
  3322. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  3323. is unlikely to optimize away. Future versions of Tor may use
  3324. a less ridiculously heavy approach for this. Fixes bug 7352.
  3325. Reported in an article by Andrey Karpov.
  3326. o Major bugfixes (crashes and asserts):
  3327. - Avoid a pair of double-free and use-after-mark bugs that can
  3328. occur with certain timings in canceled and re-received DNS
  3329. requests. Fixes bug 6472; bugfix on 0.0.7rc1.
  3330. - Fix a denial of service attack by which any directory authority
  3331. could crash all the others, or by which a single v2 directory
  3332. authority could crash everybody downloading v2 directory
  3333. information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
  3334. - Fix an assert that directory authorities could trigger on sighup
  3335. during some configuration state transitions. We now don't treat
  3336. it as a fatal error when the new descriptor we just generated in
  3337. init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
  3338. - Avoid segfault when starting up having run with an extremely old
  3339. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  3340. on 0.2.2.23-alpha.
  3341. o Major bugfixes (clients):
  3342. - If we are unable to find any exit that supports our predicted ports,
  3343. stop calling them predicted, so that we don't loop and build
  3344. hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
  3345. which introduced predicted ports.
  3346. - Check at each new consensus whether our entry guards were picked
  3347. long enough ago that we should rotate them. Previously, we only
  3348. did this check at startup, which could lead to us holding a guard
  3349. indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
  3350. - When fetching a bridge descriptor from a bridge authority,
  3351. always do so anonymously, whether we have been able to open
  3352. circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
  3353. This behavior makes it *safer* to use UpdateBridgesFromAuthority,
  3354. but we'll need to wait for bug 6010 before it's actually usable.
  3355. o Major bugfixes (directory voting):
  3356. - Check more thoroughly to prevent a rogue authority from
  3357. double-voting on any consensus directory parameter. Previously,
  3358. authorities would crash in this case if the total number of
  3359. votes for any parameter exceeded the number of active voters,
  3360. but would let it pass otherwise. Partially fixes bug 5786; bugfix
  3361. on 0.2.2.2-alpha.
  3362. - When computing weight parameters, behave more robustly in the
  3363. presence of a bad bwweightscale value. Previously, the authorities
  3364. would crash if they agreed on a sufficiently broken weight_scale
  3365. value; now, they use a reasonable default and carry on. Fixes the
  3366. rest of bug 5786; bugfix on 0.2.2.17-alpha.
  3367. - If authorities are unable to get a v2 consensus document from other
  3368. directory authorities, they no longer fall back to fetching
  3369. them from regular directory caches. Fixes bug 5635; bugfix on
  3370. 0.2.2.26-beta, where routers stopped downloading v2 consensus
  3371. documents entirely.
  3372. o Major bugfixes (relays):
  3373. - Fix a bug handling SENDME cells on nonexistent streams that could
  3374. result in bizarre window values. Report and patch contributed
  3375. pseudonymously. Fixes part of bug 6271. This bug was introduced
  3376. before the first Tor release, in svn commit r152.
  3377. - Don't update the AccountingSoftLimitHitAt state file entry whenever
  3378. tor gets started. This prevents a wrong average bandwidth
  3379. estimate, which would cause relays to always start a new accounting
  3380. interval at the earliest possible moment. Fixes bug 2003; bugfix
  3381. on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
  3382. immensely in tracking this bug down.
  3383. - Fix a possible crash bug when checking for deactivated circuits
  3384. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  3385. bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
  3386. - Set the SO_REUSEADDR socket option before we call bind() on outgoing
  3387. connections. This change should allow busy exit relays to stop
  3388. running out of available sockets as quickly. Fixes bug 4950;
  3389. bugfix on 0.2.2.26-beta.
  3390. o Major bugfixes (blocking resistance):
  3391. - Bridges no longer include their address in NETINFO cells on outgoing
  3392. OR connections, to allow them to blend in better with clients.
  3393. Removes another avenue for enumerating bridges. Reported by
  3394. "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
  3395. cells were introduced.
  3396. - Warn the user when HTTPProxy, but no other proxy type, is
  3397. configured. This can cause surprising behavior: it doesn't send
  3398. all of Tor's traffic over the HTTPProxy -- it sends unencrypted
  3399. directory traffic only. Resolves ticket 4663.
  3400. o Major bugfixes (hidden services):
  3401. - Improve hidden service robustness: when an attempt to connect to
  3402. a hidden service ends, be willing to refetch its hidden service
  3403. descriptors from each of the HSDir relays responsible for them
  3404. immediately. Previously, we would not consider refetching the
  3405. service's descriptors from each HSDir for 15 minutes after the last
  3406. fetch, which was inconvenient if the hidden service was not running
  3407. during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
  3408. - Hidden services now ignore the timestamps on INTRODUCE2 cells.
  3409. They used to check that the timestamp was within 30 minutes
  3410. of their system clock, so they could cap the size of their
  3411. replay-detection cache, but that approach unnecessarily refused
  3412. service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
  3413. the v3 intro-point protocol (the first one which sent a timestamp
  3414. field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
  3415. - When one of a hidden service's introduction points appears to be
  3416. unreachable, stop trying it. Previously, we would keep trying
  3417. to build circuits to the introduction point until we lost the
  3418. descriptor, usually because the user gave up and restarted Tor.
  3419. Fixes part of bug 3825.
  3420. o Changes to default torrc file:
  3421. - Stop listing "socksport 9050" in torrc.sample. We open a socks
  3422. port on 9050 by default anyway, so this should not change anything
  3423. in practice.
  3424. - Stop mentioning the deprecated *ListenAddress options in
  3425. torrc.sample. Fixes bug 5438.
  3426. - Document unit of bandwidth-related options in sample torrc.
  3427. Fixes bug 5621.
  3428. - Fix broken URLs in the sample torrc file, and tell readers about
  3429. the OutboundBindAddress, ExitPolicyRejectPrivate, and
  3430. PublishServerDescriptor options. Addresses bug 4652.
  3431. o Minor features (directory authorities):
  3432. - Consider new, removed or changed IPv6 OR ports a non-cosmetic
  3433. change when the authority is deciding whether to accept a newly
  3434. uploaded descriptor. Implements ticket 6423.
  3435. - Directory authorities are now a little more lenient at accepting
  3436. older router descriptors, or newer router descriptors that don't
  3437. make big changes. This should help ameliorate past and future
  3438. issues where routers think they have uploaded valid descriptors,
  3439. but the authorities don't think so. Fix for ticket 2479.
  3440. - Authority operators can now vote for all relays in a given
  3441. set of countries to be BadDir/BadExit/Invalid/Rejected.
  3442. - Provide two consensus parameters (FastFlagMinThreshold and
  3443. FastFlagMaxThreshold) to control the range of allowable bandwidths
  3444. for the Fast directory flag. These allow authorities to run
  3445. experiments on appropriate requirements for being a "Fast" node.
  3446. The AuthDirFastGuarantee config value still applies. Implements
  3447. ticket 3946.
  3448. o Minor features (bridges / bridge authorities):
  3449. - Make bridge SSL certificates a bit more stealthy by using random
  3450. serial numbers, in the same fashion as OpenSSL when generating
  3451. self-signed certificates. Implements ticket 4584.
  3452. - Tag a bridge's descriptor as "never to be sent unencrypted".
  3453. This shouldn't matter, since bridges don't open non-anonymous
  3454. connections to the bridge authority and don't allow unencrypted
  3455. directory connections from clients, but we might as well make
  3456. sure. Closes bug 5139.
  3457. - The Bridge Authority now writes statistics on how many bridge
  3458. descriptors it gave out in total, and how many unique descriptors
  3459. it gave out. It also lists how often the most and least commonly
  3460. fetched descriptors were given out, as well as the median and
  3461. 25th/75th percentile. Implements tickets 4200 and 4294.
  3462. o Minor features (IPv6):
  3463. - Make the code that clients use to detect an address change be
  3464. IPv6-aware, so that it won't fill clients' logs with error
  3465. messages when trying to get the IPv4 address of an IPv6
  3466. connection. Implements ticket 5537.
  3467. - Relays now understand an IPv6 address when they get one from a
  3468. directory server. Resolves ticket 4875.
  3469. o Minor features (hidden services):
  3470. - Expire old or over-used hidden service introduction points.
  3471. Required by fix for bug 3460.
  3472. - Reduce the lifetime of elements of hidden services' Diffie-Hellman
  3473. public key replay-detection cache from 60 minutes to 5 minutes. This
  3474. replay-detection cache is now used only to detect multiple
  3475. INTRODUCE2 cells specifying the same rendezvous point, so we can
  3476. avoid launching multiple simultaneous attempts to connect to it.
  3477. - When a hidden service's introduction point times out, consider
  3478. trying it again during the next attempt to connect to the
  3479. HS. Previously, we would not try it again unless a newly fetched
  3480. descriptor contained it. Required by fixes for bugs 1297 and 3825.
  3481. o Minor features (relays):
  3482. - Relays now include a reason for regenerating their descriptors
  3483. in an HTTP header when uploading to the authorities. This will
  3484. make it easier to debug descriptor-upload issues in the future.
  3485. - Turn on directory request statistics by default and include them in
  3486. extra-info descriptors. Don't break if we have no GeoIP database.
  3487. - Replace files in stats/ rather than appending to them. Now that we
  3488. include statistics in extra-info descriptors, it makes no sense to
  3489. keep old statistics forever. Implements ticket 2930.
  3490. - Relays that set "ConnDirectionStatistics 1" write statistics on the
  3491. bidirectional use of connections to disk every 24 hours.
  3492. - Add a GeoIP file digest to the extra-info descriptor. Implements
  3493. ticket 1883.
  3494. o Minor features (new config options):
  3495. - New config option "DynamicDHGroups" (disabled by default) provides
  3496. each bridge with a unique prime DH modulus to be used during
  3497. SSL handshakes. This option attempts to help against censors
  3498. who might use the Apache DH modulus as a static identifier for
  3499. bridges. Addresses ticket 4548.
  3500. - New config option "DisableDebuggerAttachment" (on by default)
  3501. to prevent basic debugging attachment attempts by other processes.
  3502. Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
  3503. - Ordinarily, Tor does not count traffic from private addresses (like
  3504. 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
  3505. There is now a new option, CountPrivateBandwidth, to disable this
  3506. behavior. Patch from Daniel Cagara.
  3507. o Minor features (different behavior for old config options):
  3508. - Allow MapAddress directives to specify matches against super-domains,
  3509. as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
  3510. Implements issue 933.
  3511. - Don't disable the DirPort when we cannot exceed our AccountingMax
  3512. limit during this interval because the effective bandwidthrate is
  3513. low enough. This is useful in a situation where AccountMax is only
  3514. used as an additional safeguard or to provide statistics.
  3515. - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
  3516. implements ticket 3439.
  3517. - When configuring a large set of nodes in EntryNodes, and there are
  3518. enough of them listed as Guard so that we don't need to consider
  3519. the non-guard entries, prefer the ones listed with the Guard flag.
  3520. - If you set the NumCPUs option to 0, Tor will now try to detect how
  3521. many CPUs you have. This is the new default behavior.
  3522. - The NodeFamily option -- which let you declare that you want to
  3523. consider nodes to be part of a family whether they list themselves
  3524. that way or not -- now allows IP address ranges and country codes.
  3525. o Minor features (new command-line config behavior):
  3526. - Slightly change behavior of "list" options (that is, config
  3527. options that can appear more than once) when they appear both in
  3528. torrc and on the command line. Previously, the command-line options
  3529. would be appended to the ones from torrc. Now, the command-line
  3530. options override the torrc options entirely. This new behavior
  3531. allows the user to override list options (like exit policies and
  3532. ports to listen on) from the command line, rather than simply
  3533. appending to the list.
  3534. - You can get the old (appending) command-line behavior for "list"
  3535. options by prefixing the option name with a "+".
  3536. - You can remove all the values for a "list" option from the command
  3537. line without adding any new ones by prefixing the option name
  3538. with a "/".
  3539. o Minor features (controller, new events):
  3540. - Extend the control protocol to report flags that control a circuit's
  3541. path selection in CIRC events and in replies to 'GETINFO
  3542. circuit-status'. Implements part of ticket 2411.
  3543. - Extend the control protocol to report the hidden service address
  3544. and current state of a hidden-service-related circuit in CIRC
  3545. events and in replies to 'GETINFO circuit-status'. Implements part
  3546. of ticket 2411.
  3547. - Include the creation time of a circuit in CIRC and CIRC2
  3548. control-port events and the list produced by the 'GETINFO
  3549. circuit-status' control-port command.
  3550. - Add a new CONF_CHANGED event so that controllers can be notified
  3551. of any configuration changes made by other controllers, or by the
  3552. user. Implements ticket 1692.
  3553. - Add a new SIGNAL event to the controller interface so that
  3554. controllers can be notified when Tor handles a signal. Resolves
  3555. issue 1955. Patch by John Brooks.
  3556. o Minor features (controller, new getinfo options):
  3557. - Expose our view of whether we have gone dormant to the controller,
  3558. via a new "GETINFO dormant" value. Torbutton and other controllers
  3559. can use this to avoid doing periodic requests through Tor while
  3560. it's dormant (bug 4718). Resolves ticket 5954.
  3561. - Add a new GETINFO option to get total bytes read and written. Patch
  3562. from pipe, revised by atagar. Resolves ticket 2345.
  3563. - Implement new GETINFO controller fields to provide information about
  3564. the Tor process's pid, euid, username, and resource limits.
  3565. o Minor features (controller, other):
  3566. - Allow controllers to request an event notification whenever a
  3567. circuit is cannibalized or its purpose is changed. Implements
  3568. part of ticket 3457.
  3569. - Use absolute path names when reporting the torrc filename in the
  3570. control protocol, so a controller can more easily find the torrc
  3571. file. Resolves bug 1101.
  3572. - When reporting the path to the cookie file to the controller,
  3573. give an absolute path. Resolves ticket 4881.
  3574. o Minor features (log messages):
  3575. - Add more information to a log statement that might help track down
  3576. bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
  3577. non-IP address" messages (or any Bug messages, for that matter!),
  3578. please let us know about it.
  3579. - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
  3580. EntryNodes will have no effect. Resolves issue 2571.
  3581. - Try to make the introductory warning message that Tor prints on
  3582. startup more useful for actually finding help and information.
  3583. Resolves ticket 2474.
  3584. - When the system call to create a listener socket fails, log the
  3585. error message explaining why. This may help diagnose bug 4027.
  3586. o Minor features (other):
  3587. - When we fail to initialize Libevent, retry with IOCP disabled so we
  3588. don't need to turn on multi-threading support in Libevent, which in
  3589. turn requires a working socketpair(). This is a workaround for bug
  3590. 4457, which affects Libevent versions from 2.0.1-alpha through
  3591. 2.0.15-stable.
  3592. - When starting as root and then changing our UID via the User
  3593. control option, and we have a ControlSocket configured, make sure
  3594. that the ControlSocket is owned by the same account that Tor will
  3595. run under. Implements ticket 3421; fix by Jérémy Bobbio.
  3596. - Accept attempts to include a password authenticator in the
  3597. handshake, as supported by SOCKS5. This handles SOCKS clients that
  3598. don't know how to omit a password when authenticating. Resolves
  3599. bug 1666.
  3600. - Check for and recover from inconsistency in the microdescriptor
  3601. cache. This will make it harder for us to accidentally free a
  3602. microdescriptor without removing it from the appropriate data
  3603. structures. Fixes issue 3135; issue noted by "wanoskarnet".
  3604. - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
  3605. o Minor bugfixes (code security):
  3606. - Prevent a null-pointer dereference when receiving a data cell
  3607. for a nonexistent stream when the circuit in question has an
  3608. empty deliver window. We don't believe this is triggerable,
  3609. since we don't currently allow deliver windows to become empty,
  3610. but the logic is tricky enough that it's better to make the code
  3611. robust. Fixes bug 5541; bugfix on 0.0.2pre14.
  3612. - Fix a (harmless) integer overflow in cell statistics reported by
  3613. some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
  3614. - Fix our implementation of crypto_random_hostname() so it can't
  3615. overflow on ridiculously large inputs. (No Tor version has ever
  3616. provided this kind of bad inputs, but let's be correct in depth.)
  3617. Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
  3618. - Add a (probably redundant) memory clear between iterations of
  3619. the router status voting loop, to prevent future coding errors
  3620. where data might leak between iterations of the loop. Resolves
  3621. ticket 6514.
  3622. o Minor bugfixes (wrapper functions):
  3623. - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
  3624. utility function used in the control-port code). This shouldn't
  3625. ever happen unless Tor is completely out of memory, but if it did
  3626. happen and Tor somehow recovered from it, Tor could have sent a log
  3627. message to a control port in the middle of a reply to a controller
  3628. command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
  3629. - Fix some (not actually triggerable) buffer size checks in usage of
  3630. tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
  3631. by Anders Sundman.
  3632. - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
  3633. bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
  3634. - Enforce correct return behavior of tor_vsscanf() when the '%%'
  3635. pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
  3636. - Make our replacement implementation of strtok_r() compatible with
  3637. the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
  3638. bugfix on 0.2.2.1-alpha.
  3639. - Find more places in the code that should have been testing for
  3640. invalid sockets using the SOCKET_OK macro. Required for a fix
  3641. for bug 4533. Bugfix on 0.2.2.28-beta.
  3642. o Minor bugfixes (code correctness):
  3643. - Check return value of fputs() when writing authority certificate
  3644. file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
  3645. - When building Tor on Windows with -DUNICODE (not default), ensure
  3646. that error messages, filenames, and DNS server names are always
  3647. NUL-terminated when we convert them to a single-byte encoding.
  3648. Fixes bug 5909; bugfix on 0.2.2.16-alpha.
  3649. - Fix a memory leak when trying to launch a DNS request when the
  3650. nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
  3651. 0.1.2.1-alpha.
  3652. - Correct file sizes when reading binary files on Cygwin, to avoid
  3653. a bug where Tor would fail to read its state file. Fixes bug 6844;
  3654. bugfix on 0.1.2.7-alpha.
  3655. - Make sure to set *socket_error in all error cases in
  3656. connection_connect(), so it can't produce a warning about
  3657. errno being zero from errno_to_orconn_end_reason(). Bugfix on
  3658. 0.2.1.1-alpha; resolves ticket 6028.
  3659. - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
  3660. bug 4532; found by "troll_un".
  3661. o Minor bugfixes (clients):
  3662. - Allow one-hop directory-fetching circuits the full "circuit build
  3663. timeout" period, rather than just half of it, before failing them
  3664. and marking the relay down. This fix should help reduce cases where
  3665. clients declare relays (or worse, bridges) unreachable because
  3666. the TLS handshake takes a few seconds to complete. Fixes bug 6743;
  3667. bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
  3668. 30 seconds.
  3669. - Ensure we don't cannibalize circuits that are longer than three hops
  3670. already, so we don't end up making circuits with 5 or more
  3671. hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
  3672. 0.1.0.1-rc which introduced cannibalization.
  3673. o Minor bugfixes (relays):
  3674. - Don't publish a new relay descriptor when we reload our onion key,
  3675. unless the onion key has actually changed. Fixes bug 3263 and
  3676. resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
  3677. - When relays refuse a "create" cell because their queue of pending
  3678. create cells is too big (typically because their cpu can't keep up
  3679. with the arrival rate), send back reason "resource limit" rather
  3680. than reason "internal", so network measurement scripts can get a
  3681. more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
  3682. - Exit nodes don't need to fetch certificates for authorities that
  3683. they don't recognize; only directory authorities, bridges,
  3684. and caches need to do that. Fixes part of bug 2297; bugfix on
  3685. 0.2.2.11-alpha.
  3686. o Minor bugfixes (directory authority / mirrors):
  3687. - Avoid O(n^2) performance characteristics when parsing a large
  3688. extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
  3689. - Authorities no longer include any router in their microdescriptor
  3690. consensuses for which they couldn't generate or agree on a
  3691. microdescriptor. Fixes the second piece of bug 6404; fix on
  3692. 0.2.2.6-alpha.
  3693. - When checking for requested signatures on the latest consensus
  3694. before serving it to a client, make sure to check the right
  3695. consensus flavor. Bugfix on 0.2.2.6-alpha.
  3696. - Fix an edge case where TestingTorNetwork is set but the authorities
  3697. and relays all have an uptime of zero, so the private Tor network
  3698. could briefly lack support for hidden services. Fixes bug 3886;
  3699. bugfix on 0.2.2.18-alpha.
  3700. - Directory caches no longer refuse to clean out descriptors because
  3701. of missing v2 networkstatus documents, unless they're configured
  3702. to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
  3703. 0.2.2.26-beta. Patch by Daniel Bryg.
  3704. - Don't serve or accept v2 hidden service descriptors over a relay's
  3705. DirPort. It's never correct to do so, and disabling it might
  3706. make it more annoying to exploit any bugs that turn up in the
  3707. descriptor-parsing code. Fixes bug 7149.
  3708. o Minor bugfixes (hidden services, client-side):
  3709. - Assert that hidden-service-related operations are not performed
  3710. using single-hop circuits. Previously, Tor would assert that
  3711. client-side streams are not attached to single-hop circuits,
  3712. but not that other sensitive operations on the client and service
  3713. side are not performed using single-hop circuits. Fixes bug 3332;
  3714. bugfix on 0.0.6.
  3715. - Avoid undefined behavior when parsing the list of supported
  3716. rendezvous/introduction protocols in a hidden service descriptor.
  3717. Previously, Tor would have confused (as-yet-unused) protocol version
  3718. numbers greater than 32 with lower ones on many platforms. Fixes
  3719. bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
  3720. - Don't close hidden service client circuits which have almost
  3721. finished connecting to their destination when they reach
  3722. the normal circuit-build timeout. Previously, we would close
  3723. introduction circuits which are waiting for an acknowledgement
  3724. from the introduction point, and rendezvous circuits which have
  3725. been specified in an INTRODUCE1 cell sent to a hidden service,
  3726. after the normal CBT. Now, we mark them as 'timed out', and launch
  3727. another rendezvous attempt in parallel. This behavior change can
  3728. be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
  3729. option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
  3730. o Minor bugfixes (hidden services, service-side):
  3731. - Don't close hidden-service-side rendezvous circuits when they
  3732. reach the normal circuit-build timeout. This behavior change can
  3733. be disabled using the new
  3734. CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
  3735. remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
  3736. - Don't launch more than 10 service-side introduction-point circuits
  3737. for a hidden service in five minutes. Previously, we would consider
  3738. launching more introduction-point circuits if at least one second
  3739. had passed without any introduction-point circuits failing. Fixes
  3740. bug 4607; bugfix on 0.0.7pre1.
  3741. o Minor bugfixes (config option behavior):
  3742. - If the user tries to set MyFamily on a bridge, refuse to
  3743. do so, and warn about the security implications. Fixes bug 4657;
  3744. bugfix on 0.2.0.3-alpha.
  3745. - The "--quiet" and "--hush" options now apply not only to Tor's
  3746. behavior before logs are configured, but also to Tor's behavior in
  3747. the absense of configured logs. Fixes bug 3550; bugfix on
  3748. 0.2.0.10-alpha.
  3749. - Change the AllowDotExit rules so they should actually work.
  3750. We now enforce AllowDotExit only immediately after receiving an
  3751. address via SOCKS or DNSPort: other sources are free to provide
  3752. .exit addresses after the resolution occurs. Fixes bug 3940;
  3753. bugfix on 0.2.2.1-alpha.
  3754. - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
  3755. don't depend on the consensus parameters or compute adaptive
  3756. timeouts when it is disabled. Fixes bug 5049; bugfix on
  3757. 0.2.2.14-alpha.
  3758. - After we pick a directory mirror, we would refuse to use it if
  3759. it's in our ExcludeExitNodes list, resulting in mysterious failures
  3760. to bootstrap for people who just wanted to avoid exiting from
  3761. certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
  3762. - When told to add a bridge with the same digest as a preexisting
  3763. bridge but a different addr:port, change the addr:port as
  3764. requested. Previously we would not notice the change. Fixes half
  3765. of bug 5603; fix on 0.2.2.26-beta.
  3766. o Minor bugfixes (controller):
  3767. - Allow manual 'authenticate' commands to the controller interface
  3768. from netcat (nc) as well as telnet. We were rejecting them because
  3769. they didn't come with the expected whitespace at the end of the
  3770. command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
  3771. - Report a real bootstrap problem to the controller on router
  3772. identity mismatch. Previously we just said "foo", which probably
  3773. made a lot of sense at the time. Fixes bug 4169; bugfix on
  3774. 0.2.1.1-alpha.
  3775. - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
  3776. option is set to 0 (which Vidalia version 0.2.16 now does when
  3777. a SAVECONF attempt fails), perform other actions that SIGHUP
  3778. usually causes (like reopening the logs). Fixes bug 5095; bugfix
  3779. on 0.2.1.9-alpha.
  3780. - Correctly handle checking the permissions on the parent
  3781. directory of a control socket in the root directory. Bug found
  3782. by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
  3783. 0.2.2.26-beta.
  3784. - End AUTHCHALLENGE error messages (in the control protocol) with
  3785. a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
  3786. o Minor bugfixes (network reading/writing):
  3787. - Disable writing on marked-for-close connections when they are
  3788. blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
  3789. bug 5263; bugfix on 0.0.2pre13, where we first added a special
  3790. case for flushing marked connections.
  3791. - Make sure that there are no unhandled pending TLS errors before
  3792. reading from a TLS stream. We had checks in 0.1.0.3-rc, but
  3793. lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
  3794. Bugfix on 0.1.0.5-rc; fixes bug 4528.
  3795. - Detect SSL handshake even when the initial attempt to write the
  3796. server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
  3797. - If the client fails to set a reasonable set of ciphersuites
  3798. during its v2 handshake renegotiation, allow the renegotiation to
  3799. continue nevertheless (i.e. send all the required certificates).
  3800. Fixes bug 4591; bugfix on 0.2.0.20-rc.
  3801. o Minor bugfixes (other):
  3802. - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
  3803. resource exhaustion, so that clients can adjust their load to
  3804. try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
  3805. started using END_STREAM_REASON_RESOURCELIMIT.
  3806. - Don't check for whether the address we're using for outbound
  3807. connections has changed until after the outbound connection has
  3808. completed. On Windows, getsockname() doesn't succeed until the
  3809. connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
  3810. - Don't hold a Windows file handle open for every file mapping;
  3811. the file mapping handle is sufficient. Fixes bug 5951; bugfix on
  3812. 0.1.2.1-alpha.
  3813. - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
  3814. bugfix on 0.2.1.10-alpha.
  3815. - If we fail to write a microdescriptor to the disk cache, do not
  3816. continue replacing the old microdescriptor file. Fixes bug 2954;
  3817. bugfix on 0.2.2.6-alpha.
  3818. o Minor bugfixes (log messages, path selection):
  3819. - Downgrade "set buildtimeout to low value" messages to "info"
  3820. severity; they were never an actual problem, there was never
  3821. anything reasonable to do about them, and they tended to spam logs
  3822. from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
  3823. - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
  3824. more information to it, so that we can track it down in case it
  3825. returns again. Mitigates bug 5235.
  3826. - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
  3827. options_validate(); warn if LearnCircuitBuildTimeout is disabled and
  3828. CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
  3829. - Issue a log message if a guard completes less than 40% of your
  3830. circuits. Threshold is configurable by torrc option
  3831. PathBiasNoticeRate and consensus parameter pb_noticepct. There is
  3832. additional, off-by-default code to disable guards which fail too
  3833. many circuits. Addresses ticket 5458.
  3834. o Minor bugfixes (log messages, client):
  3835. - Downgrade "Got a certificate, but we already have it" log messages
  3836. from warning to info, except when we're a dirauth. Fixes bug 5238;
  3837. bugfix on 0.2.1.7-alpha.
  3838. - Fix the log message describing how we work around discovering
  3839. that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
  3840. 4837; bugfix on 0.2.2.9-alpha.
  3841. - When logging about a disallowed .exit name, do not also call it
  3842. an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
  3843. - Fix a log message suggesting that people contact a non-existent
  3844. email address. Fixes bug 3448.
  3845. - Rephrase the log message emitted if the TestSocks check is
  3846. successful. Patch from Fabian Keil; fixes bug 4094.
  3847. - Log (at debug level) whenever a circuit's purpose is changed.
  3848. - Log SSL state transitions at log level DEBUG, log domain
  3849. HANDSHAKE. This can be useful for debugging censorship events.
  3850. Implements ticket 3264.
  3851. - We now log which torrc file we're using on startup. Implements
  3852. ticket 2444.
  3853. - Rate-limit log messages when asked to connect anonymously to
  3854. a private address. When these hit, they tended to hit fast and
  3855. often. Also, don't bother trying to connect to addresses that we
  3856. are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
  3857. reply makes us think we have been lied to, even when the address the
  3858. client tried to connect to was "localhost." Resolves ticket 2822.
  3859. o Minor bugfixes (log messages, non-client):
  3860. - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
  3861. Fixes bug 5932; bugfix on 0.2.2.7-alpha.
  3862. - Don't log that we have "decided to publish new relay descriptor"
  3863. unless we are actually publishing a descriptor. Fixes bug 3942;
  3864. bugfix on 0.2.2.28-beta.
  3865. - Log which authority we're missing votes from when we go to fetch
  3866. them from the other auths.
  3867. - Replace "Sending publish request" log messages with "Launching
  3868. upload", so that they no longer confusingly imply that we're
  3869. sending something to a directory we might not even be connected
  3870. to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
  3871. - Warn when Tor is configured to use accounting in a way that can
  3872. link a hidden service to some other hidden service or public
  3873. address. Resolves ticket 6490.
  3874. - Fix a minor formatting issue in one of tor-gencert's error messages.
  3875. Fixes bug 4574.
  3876. o Testing:
  3877. - Update to the latest version of the tinytest unit testing framework.
  3878. This includes a couple of bugfixes that can be relevant for
  3879. running forked unit tests on Windows, and removes all reserved
  3880. identifiers.
  3881. - Avoid a false positive in the util/threads unit test by increasing
  3882. the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
  3883. - Make it possible to set the TestingTorNetwork configuration
  3884. option using AlternateDirAuthority and AlternateBridgeAuthority
  3885. as an alternative to setting DirServer. Addresses ticket 6377.
  3886. - Add a unit test for the environment_variable_names_equal() function.
  3887. - A wide variety of new unit tests by Esteban Manchado Velázquez.
  3888. - Numerous new unit tests for functions in util.c and address.c by
  3889. Anders Sundman.
  3890. - The long-disabled benchmark tests are now split into their own
  3891. ./src/test/bench binary.
  3892. - The benchmark tests can now use more accurate timers than
  3893. gettimeofday() when such timers are available.
  3894. - Use tt_assert(), not tor_assert(), for checking for test failures.
  3895. This makes the unit tests more able to go on in the event that
  3896. one of them fails.
  3897. o Build improvements:
  3898. - Use the dead_strip option when building Tor on OS X. This reduces
  3899. binary size by almost 19% when linking openssl and libevent
  3900. statically, which we do for Tor Browser Bundle.
  3901. - Provide a better error message about possible OSX Asciidoc failure
  3902. reasons. Fixes bug 6436.
  3903. - Detect attempts to build Tor on (as yet hypothetical) versions
  3904. of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
  3905. fix for bug 4533. Bugfix on 0.2.2.28-beta.
  3906. - On Windows, we now define the _WIN32_WINNT macros only if they
  3907. are not already defined. This lets the person building Tor decide,
  3908. if they want, to require a later version of Windows.
  3909. - Our autogen.sh script now uses autoreconf to launch autoconf,
  3910. automake, and so on. This is more robust against some of the failure
  3911. modes associated with running the autotools pieces on their own.
  3912. - Running "make version" now displays the version of Tor that
  3913. we're about to build. Idea from katmagic; resolves issue 4400.
  3914. - Make 'tor --digests' list hashes of all Tor source files. Bugfix
  3915. on 0.2.2.4-alpha; fixes bug 3427.
  3916. - New --enable-static-tor configure option for building Tor as
  3917. statically as possible. Idea, general hackery and thoughts from
  3918. Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
  3919. 2702.
  3920. - Limited, experimental support for building with nmake and MSVC.
  3921. o Build requirements:
  3922. - Building Tor with bufferevent support now requires Libevent
  3923. 2.0.13-stable or later. Previous versions of Libevent had bugs in
  3924. SSL-related bufferevents and related issues that would make Tor
  3925. work badly with bufferevents. Requiring 2.0.13-stable also allows
  3926. Tor with bufferevents to take advantage of Libevent APIs
  3927. introduced after 2.0.8-rc.
  3928. - Our build system requires automake 1.6 or later to create the
  3929. Makefile.in files. Previously, you could have used 1.4.
  3930. This only affects developers and people building Tor from git;
  3931. people who build Tor from the source distribution without changing
  3932. the Makefile.am files should be fine.
  3933. - Detect when we try to build on a platform that doesn't define
  3934. AF_UNSPEC to 0. We don't work there, so refuse to compile.
  3935. o Build fixes (compile/link):
  3936. - Format more doubles with %f, not %lf. Patch from grarpamp to make
  3937. Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
  3938. Tor 0.2.0.8-alpha.
  3939. - When building with --enable-static-tor on OpenBSD, do not
  3940. erroneously attempt to link -lrt. Fixes bug 5103.
  3941. - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
  3942. that IPv6 stuff will compile on MSVC, and compilation issues
  3943. will be easier to track down. Fixes bug 5861.
  3944. - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
  3945. Fixes bug 6379. Bugfix on 0.2.0.20-rc.
  3946. - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
  3947. Fixes bug 6097; bugfix on 0.2.2.16-alpha.
  3948. o Build fixes (other):
  3949. - Use the _WIN32 macro throughout our code to detect Windows.
  3950. (Previously we had used the obsolete 'WIN32' and the idiosyncratic
  3951. 'MS_WINDOWS'.)
  3952. - Properly handle the case where the build-tree is not the same
  3953. as the source tree when generating src/common/common_sha1.i,
  3954. src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
  3955. bugfix on 0.2.0.1-alpha.
  3956. - During configure, search for library containing cos function as
  3957. libm lives in libcore on some platforms (BeOS/Haiku). Linking
  3958. against libm was hard-coded before. Fixes the first part of bug
  3959. 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
  3960. Pedersen.
  3961. - Prevent a false positive from the check-spaces script, by disabling
  3962. the "whitespace between function name and (" check for functions
  3963. named 'op()'.
  3964. o Packaging (RPM) changes:
  3965. - Update our default RPM spec files to work with mock and rpmbuild
  3966. on RHEL/Fedora. They have an updated set of dependencies and
  3967. conflicts, a fix for an ancient typo when creating the "_tor"
  3968. user, and better instructions. Thanks to Ondrej Mikle for the
  3969. patch series. Fixes bug 6043.
  3970. - On OpenSUSE, create the /var/run/tor directory on startup if it
  3971. is not already created. Patch from Andreas Stieger. Fixes bug 2573.
  3972. o Code refactoring (safety):
  3973. - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
  3974. 10 lines. Also, don't nest them. Doing so in the past has
  3975. led to hard-to-debug code. The new style is to use the
  3976. SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
  3977. - Use macros to indicate OpenSSL versions, so we don't need to worry
  3978. about accidental hexadecimal bit shifts.
  3979. - Use tor_sscanf() in place of scanf() in more places through the
  3980. code. This makes us a little more locale-independent, and
  3981. should help shut up code-analysis tools that can't tell
  3982. a safe sscanf string from a dangerous one.
  3983. - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
  3984. - Use the smartlist_add_asprintf() alias more consistently.
  3985. o Code refactoring (consolidate):
  3986. - A major revision to our internal node-selecting and listing logic.
  3987. Tor already had at least two major ways to look at the question of
  3988. "which Tor servers do we know about": a list of router descriptors,
  3989. and a list of entries in the current consensus. With
  3990. microdescriptors, we're adding a third. Having so many systems
  3991. without an abstraction layer over them was hurting the codebase.
  3992. Now, we have a new "node_t" abstraction that presents a consistent
  3993. interface to a client's view of a Tor node, and holds (nearly) all
  3994. of the mutable state formerly in routerinfo_t and routerstatus_t.
  3995. - Move tor_gettimeofday_cached() into compat_libevent.c, and use
  3996. Libevent's notion of cached time when possible.
  3997. - Remove duplicate code for invoking getrlimit() from control.c.
  3998. - Use OpenSSL's built-in SSL_state_string_long() instead of our
  3999. own homebrewed ssl_state_to_string() replacement. Patch from
  4000. Emile Snyder. Fixes bug 4653.
  4001. - Change the symmetric cipher interface so that creating and
  4002. initializing a stream cipher are no longer separate functions.
  4003. o Code refactoring (separate):
  4004. - Make a new "entry connection" struct as an internal subtype of "edge
  4005. connection", to simplify the code and make exit connections smaller.
  4006. - Split connection_about_to_close() into separate functions for each
  4007. connection type.
  4008. - Rewrite the listener-selection logic so that parsing which ports
  4009. we want to listen on is now separate from binding to the ports
  4010. we want.
  4011. o Code refactoring (name changes):
  4012. - Rename a handful of old identifiers, mostly related to crypto
  4013. structures and crypto functions. By convention, our "create an
  4014. object" functions are called "type_new()", our "free an object"
  4015. functions are called "type_free()", and our types indicate that
  4016. they are types only with a final "_t". But a handful of older
  4017. types and functions broke these rules, with function names like
  4018. "type_create" or "subsystem_op_type", or with type names like
  4019. type_env_t.
  4020. - Rename Tor functions that turn strings into addresses, so that
  4021. "parse" indicates that no hostname resolution occurs, and
  4022. "lookup" indicates that hostname resolution may occur. This
  4023. should help prevent mistakes in the future. Fixes bug 3512.
  4024. - Use the name "CERTS" consistently to refer to the new cell type;
  4025. we were calling it CERT in some places and CERTS in others.
  4026. - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
  4027. invalid value, rather than just -1.
  4028. - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
  4029. can pick them up when the tests aren't disabled. Bugfix on
  4030. 0.2.2.4-alpha which introduced tinytest.
  4031. o Code refactoring (other):
  4032. - Defensively refactor rend_mid_rendezvous() so that protocol
  4033. violations and length checks happen in the beginning. Fixes
  4034. bug 5645.
  4035. - Remove the pure attribute from all functions that used it
  4036. previously. In many cases we assigned it incorrectly, because the
  4037. functions might assert or call impure functions, and we don't have
  4038. evidence that keeping the pure attribute is worthwhile. Implements
  4039. changes suggested in ticket 4421.
  4040. - Move the replay-detection cache for the RSA-encrypted parts of
  4041. INTRODUCE2 cells to the introduction point data structures.
  4042. Previously, we would use one replay-detection cache per hidden
  4043. service. Required by fix for bug 3460.
  4044. - The helper programs tor-gencert, tor-resolve, and tor-checkkey
  4045. no longer link against Libevent: they never used it, but
  4046. our library structure used to force them to link it.
  4047. o Removed features and files:
  4048. - Remove all internal support for unpadded RSA. We never used it, and
  4049. it would be a bad idea to start.
  4050. - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
  4051. supported).
  4052. - Remove some redundant #include directives throughout the code.
  4053. Patch from Andrea Gelmini.
  4054. - Remove some old code to remember statistics about which descriptors
  4055. we've served as a directory mirror. The feature wasn't used and
  4056. is outdated now that microdescriptors are around.
  4057. - Remove some old code to work around even older versions of Tor that
  4058. used forked processes to handle DNS requests. Such versions of Tor
  4059. are no longer in use as relays.
  4060. - The "torify" script no longer supports the "tsocks" socksifier
  4061. tool, since tsocks doesn't support DNS and UDP right for Tor.
  4062. Everyone should be using torsocks instead. Fixes bugs 3530 and
  4063. 5180. Based on a patch by "ugh".
  4064. - Remove the torrc.bridge file: we don't use it for anything, and
  4065. it had become badly desynchronized from torrc.sample. Resolves
  4066. bug 5622.
  4067. o Documentation:
  4068. - Begin a doc/state-contents.txt file to explain the contents of
  4069. the Tor state file. Fixes bug 2987.
  4070. - Clarify the documentation for the Alternate*Authority options.
  4071. Fixes bug 6387.
  4072. - Document the --defaults-torrc option, and the new semantics for
  4073. overriding, extending, and clearing lists of options. Closes
  4074. bug 4748.
  4075. - Add missing man page documentation for consensus and microdesc
  4076. files. Resolves ticket 6732.
  4077. - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
  4078. o Documentation fixes:
  4079. - Improve the manual's documentation for the NT Service command-line
  4080. options. Addresses ticket 3964.
  4081. - Clarify SessionGroup documentation slightly; resolves ticket 5437.
  4082. - Document the changes to the ORPort and DirPort options, and the
  4083. fact that {OR/Dir}ListenAddress is now unnecessary (and
  4084. therefore deprecated). Resolves ticket 5597.
  4085. - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
  4086. - Clarify that hidden services are TCP only. Fixes bug 6024.
  4087. Changes in version 0.2.2.39 - 2012-09-11
  4088. Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
  4089. assertions.
  4090. o Security fixes:
  4091. - Fix an assertion failure in tor_timegm() that could be triggered
  4092. by a badly formatted directory object. Bug found by fuzzing with
  4093. Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
  4094. - Do not crash when comparing an address with port value 0 to an
  4095. address policy. This bug could have been used to cause a remote
  4096. assertion failure by or against directory authorities, or to
  4097. allow some applications to crash clients. Fixes bug 6690; bugfix
  4098. on 0.2.1.10-alpha.
  4099. Changes in version 0.2.2.38 - 2012-08-12
  4100. Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
  4101. attack that could in theory leak path information.
  4102. o Security fixes:
  4103. - Avoid an uninitialized memory read when reading a vote or consensus
  4104. document that has an unrecognized flavor name. This read could
  4105. lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
  4106. - Try to leak less information about what relays a client is
  4107. choosing to a side-channel attacker. Previously, a Tor client would
  4108. stop iterating through the list of available relays as soon as it
  4109. had chosen one, thus finishing a little earlier when it picked
  4110. a router earlier in the list. If an attacker can recover this
  4111. timing information (nontrivial but not proven to be impossible),
  4112. they could learn some coarse-grained information about which relays
  4113. a client was picking (middle nodes in particular are likelier to
  4114. be affected than exits). The timing attack might be mitigated by
  4115. other factors (see bug 6537 for some discussion), but it's best
  4116. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  4117. Changes in version 0.2.2.37 - 2012-06-06
  4118. Tor 0.2.2.37 introduces a workaround for a critical renegotiation
  4119. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  4120. currently).
  4121. o Major bugfixes:
  4122. - Work around a bug in OpenSSL that broke renegotiation with TLS
  4123. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  4124. the v2 Tor connection protocol when both sides were using OpenSSL
  4125. 1.0.1 would fail. Resolves ticket 6033.
  4126. - When waiting for a client to renegotiate, don't allow it to add
  4127. any bytes to the input buffer. This fixes a potential DoS issue.
  4128. Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
  4129. - Fix an edge case where if we fetch or publish a hidden service
  4130. descriptor, we might build a 4-hop circuit and then use that circuit
  4131. for exiting afterwards -- even if the new last hop doesn't obey our
  4132. ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
  4133. o Minor bugfixes:
  4134. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  4135. Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
  4136. o Minor features:
  4137. - Tell GCC and Clang to check for any errors in format strings passed
  4138. to the tor_v*(print|scan)f functions.
  4139. Changes in version 0.2.2.36 - 2012-05-24
  4140. Tor 0.2.2.36 updates the addresses for two of the eight directory
  4141. authorities, fixes some potential anonymity and security issues,
  4142. and fixes several crash bugs.
  4143. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
  4144. known flaws, and nobody should be using them. You should upgrade. If
  4145. you're using a Linux or BSD and its packages are obsolete, stop using
  4146. those packages and upgrade anyway.
  4147. o Directory authority changes:
  4148. - Change IP address for maatuska (v3 directory authority).
  4149. - Change IP address for ides (v3 directory authority), and rename
  4150. it to turtles.
  4151. o Security fixes:
  4152. - When building or running with any version of OpenSSL earlier
  4153. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  4154. versions have a bug (CVE-2011-4576) in which their block cipher
  4155. padding includes uninitialized data, potentially leaking sensitive
  4156. information to any peer with whom they make a SSLv3 connection. Tor
  4157. does not use SSL v3 by default, but a hostile client or server
  4158. could force an SSLv3 connection in order to gain information that
  4159. they shouldn't have been able to get. The best solution here is to
  4160. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  4161. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  4162. to make sure that the bug can't happen.
  4163. - Never use a bridge or a controller-supplied node as an exit, even
  4164. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  4165. 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
  4166. and 0.2.0.3-alpha (for bridge-purpose descriptors).
  4167. - Only build circuits if we have a sufficient threshold of the total
  4168. descriptors that are marked in the consensus with the "Exit"
  4169. flag. This mitigates an attack proposed by wanoskarnet, in which
  4170. all of a client's bridges collude to restrict the exit nodes that
  4171. the client knows about. Fixes bug 5343.
  4172. - Provide controllers with a safer way to implement the cookie
  4173. authentication mechanism. With the old method, if another locally
  4174. running program could convince a controller that it was the Tor
  4175. process, then that program could trick the controller into telling
  4176. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  4177. authentication method uses a challenge-response approach to prevent
  4178. this attack. Fixes bug 5185; implements proposal 193.
  4179. o Major bugfixes:
  4180. - Avoid logging uninitialized data when unable to decode a hidden
  4181. service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
  4182. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  4183. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  4184. 0.2.1.6-alpha.
  4185. - Fix builds when the path to sed, openssl, or sha1sum contains
  4186. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  4187. on 0.2.2.1-alpha.
  4188. - Correct our replacements for the timeradd() and timersub() functions
  4189. on platforms that lack them (for example, Windows). The timersub()
  4190. function is used when expiring circuits, while timeradd() is
  4191. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  4192. bugfix on 0.2.2.24-alpha.
  4193. - Fix the SOCKET_OK test that we use to tell when socket
  4194. creation fails so that it works on Win64. Fixes part of bug 4533;
  4195. bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
  4196. o Minor bugfixes:
  4197. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  4198. Fixes bug 5346; bugfix on 0.0.8pre3.
  4199. - Make our number-parsing functions always treat too-large values
  4200. as an error, even when those values exceed the width of the
  4201. underlying type. Previously, if the caller provided these
  4202. functions with minima or maxima set to the extreme values of the
  4203. underlying integer type, these functions would return those
  4204. values on overflow rather than treating overflow as an error.
  4205. Fixes part of bug 5786; bugfix on 0.0.9.
  4206. - Older Linux kernels erroneously respond to strange nmap behavior
  4207. by having accept() return successfully with a zero-length
  4208. socket. When this happens, just close the connection. Previously,
  4209. we would try harder to learn the remote address: but there was
  4210. no such remote address to learn, and our method for trying to
  4211. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  4212. on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
  4213. - Correct parsing of certain date types in parse_http_time().
  4214. Without this patch, If-Modified-Since would behave
  4215. incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
  4216. Esteban Manchado Velázques.
  4217. - Change the BridgePassword feature (part of the "bridge community"
  4218. design, which is not yet implemented) to use a time-independent
  4219. comparison. The old behavior might have allowed an adversary
  4220. to use timing to guess the BridgePassword value. Fixes bug 5543;
  4221. bugfix on 0.2.0.14-alpha.
  4222. - Detect and reject certain misformed escape sequences in
  4223. configuration values. Previously, these values would cause us
  4224. to crash if received in a torrc file or over an authenticated
  4225. control port. Bug found by Esteban Manchado Velázquez, and
  4226. independently by Robert Connolly from Matta Consulting who further
  4227. noted that it allows a post-authentication heap overflow. Patch
  4228. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  4229. bugfix on 0.2.0.16-alpha.
  4230. - Fix a compile warning when using the --enable-openbsd-malloc
  4231. configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
  4232. - During configure, detect when we're building with clang version
  4233. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  4234. CFLAGS. clang doesn't support them yet.
  4235. - When sending an HTTP/1.1 proxy request, include a Host header.
  4236. Fixes bug 5593; bugfix on 0.2.2.1-alpha.
  4237. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
  4238. command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
  4239. - If we hit the error case where routerlist_insert() replaces an
  4240. existing (old) server descriptor, make sure to remove that
  4241. server descriptor from the old_routers list. Fix related to bug
  4242. 1776. Bugfix on 0.2.2.18-alpha.
  4243. o Minor bugfixes (documentation and log messages):
  4244. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  4245. Fixes bug 4856; bugfix on Tor 0.0.6.
  4246. - Update "ClientOnly" man page entry to explain that there isn't
  4247. really any point to messing with it. Resolves ticket 5005.
  4248. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  4249. directory authority option (introduced in Tor 0.2.2.34).
  4250. - Downgrade the "We're missing a certificate" message from notice
  4251. to info: people kept mistaking it for a real problem, whereas it
  4252. is seldom the problem even when we are failing to bootstrap. Fixes
  4253. bug 5067; bugfix on 0.2.0.10-alpha.
  4254. - Correctly spell "connect" in a log message on failure to create a
  4255. controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
  4256. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  4257. circuits. Fixes issue 5259.
  4258. o Minor features:
  4259. - Directory authorities now reject versions of Tor older than
  4260. 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
  4261. inclusive. These versions accounted for only a small fraction of
  4262. the Tor network, and have numerous known security issues. Resolves
  4263. issue 4788.
  4264. - Update to the May 1 2012 Maxmind GeoLite Country database.
  4265. - Feature removal:
  4266. - When sending or relaying a RELAY_EARLY cell, we used to convert
  4267. it to a RELAY cell if the connection was using the v1 link
  4268. protocol. This was a workaround for older versions of Tor, which
  4269. didn't handle RELAY_EARLY cells properly. Now that all supported
  4270. versions can handle RELAY_EARLY cells, and now that we're enforcing
  4271. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  4272. remove this workaround. Addresses bug 4786.
  4273. Changes in version 0.2.2.35 - 2011-12-16
  4274. Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
  4275. buffers code. Absolutely everybody should upgrade.
  4276. The bug relied on an incorrect calculation when making data continuous
  4277. in one of our IO buffers, if the first chunk of the buffer was
  4278. misaligned by just the wrong amount. The miscalculation would allow an
  4279. attacker to overflow a piece of heap-allocated memory. To mount this
  4280. attack, the attacker would need to either open a SOCKS connection to
  4281. Tor's SocksPort (usually restricted to localhost), or target a Tor
  4282. instance configured to make its connections through a SOCKS proxy
  4283. (which Tor does not do by default).
  4284. Good security practice requires that all heap-overflow bugs should be
  4285. presumed to be exploitable until proven otherwise, so we are treating
  4286. this as a potential code execution attack. Please upgrade immediately!
  4287. This bug does not affect bufferevents-based builds of Tor. Special
  4288. thanks to "Vektor" for reporting this issue to us!
  4289. Tor 0.2.2.35 also fixes several bugs in previous versions, including
  4290. crash bugs for unusual configurations, and a long-term bug that
  4291. would prevent Tor from starting on Windows machines with draconian
  4292. AV software.
  4293. With this release, we remind everyone that 0.2.0.x has reached its
  4294. formal end-of-life. Those Tor versions have many known flaws, and
  4295. nobody should be using them. You should upgrade -- ideally to the
  4296. 0.2.2.x series. If you're using a Linux or BSD and its packages are
  4297. obsolete, stop using those packages and upgrade anyway.
  4298. The Tor 0.2.1.x series is also approaching its end-of-life: it will no
  4299. longer receive support after some time in early 2012.
  4300. o Major bugfixes:
  4301. - Fix a heap overflow bug that could occur when trying to pull
  4302. data into the first chunk of a buffer, when that chunk had
  4303. already had some data drained from it. Fixes CVE-2011-2778;
  4304. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  4305. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  4306. that it doesn't attempt to allocate a socketpair. This could cause
  4307. some problems on Windows systems with overzealous firewalls. Fix for
  4308. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  4309. 2.0.15-stable.
  4310. - If we mark an OR connection for close based on a cell we process,
  4311. don't process any further cells on it. We already avoid further
  4312. reads on marked-for-close connections, but now we also discard the
  4313. cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
  4314. which was the first version where we might mark a connection for
  4315. close based on processing a cell on it.
  4316. - Correctly sanity-check that we don't underflow on a memory
  4317. allocation (and then assert) for hidden service introduction
  4318. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  4319. bugfix on 0.2.1.5-alpha.
  4320. - Fix a memory leak when we check whether a hidden service
  4321. descriptor has any usable introduction points left. Fixes bug
  4322. 4424. Bugfix on 0.2.2.25-alpha.
  4323. - Don't crash when we're running as a relay and don't have a GeoIP
  4324. file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
  4325. we've had in the 0.2.3.x branch already.
  4326. - When running as a client, do not print a misleading (and plain
  4327. wrong) log message that we're collecting "directory request"
  4328. statistics: clients don't collect statistics. Also don't create a
  4329. useless (because empty) stats file in the stats/ directory. Fixes
  4330. bug 4353; bugfix on 0.2.2.34.
  4331. o Minor bugfixes:
  4332. - Detect failure to initialize Libevent. This fix provides better
  4333. detection for future instances of bug 4457.
  4334. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  4335. function. This was eating up hideously large amounts of time on some
  4336. busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
  4337. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  4338. Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
  4339. Mansour Moufid.
  4340. - Don't warn about unused log_mutex in log.c when building with
  4341. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  4342. 0.1.0.6-rc which introduced --disable-threads.
  4343. - When configuring, starting, or stopping an NT service, stop
  4344. immediately after the service configuration attempt has succeeded
  4345. or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
  4346. - When sending a NETINFO cell, include the original address
  4347. received for the other side, not its canonical address. Found
  4348. by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
  4349. - Fix a typo in a hibernation-related log message. Fixes bug 4331;
  4350. bugfix on 0.2.2.23-alpha; found by "tmpname0901".
  4351. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  4352. occurred when a client tried to fetch a descriptor for a bridge
  4353. in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
  4354. - Backport fixes for a pair of compilation warnings on Windows.
  4355. Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
  4356. - If we had ever tried to call tor_addr_to_str on an address of
  4357. unknown type, we would have done a strdup on an uninitialized
  4358. buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
  4359. Reported by "troll_un".
  4360. - Correctly detect and handle transient lookup failures from
  4361. tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
  4362. Reported by "troll_un".
  4363. - Fix null-pointer access that could occur if TLS allocation failed.
  4364. Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
  4365. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  4366. 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
  4367. o Minor features:
  4368. - Add two new config options for directory authorities:
  4369. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  4370. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  4371. that is always sufficient to satisfy the bandwidth requirement for
  4372. the Guard flag. Now it will be easier for researchers to simulate
  4373. Tor networks with different values. Resolves ticket 4484.
  4374. - When Tor ignores a hidden service specified in its configuration,
  4375. include the hidden service's directory in the warning message.
  4376. Previously, we would only tell the user that some hidden service
  4377. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  4378. - Update to the December 6 2011 Maxmind GeoLite Country database.
  4379. o Packaging changes:
  4380. - Make it easier to automate expert package builds on Windows,
  4381. by removing an absolute path from makensis.exe command.
  4382. Changes in version 0.2.1.32 - 2011-12-16
  4383. Tor 0.2.1.32 backports important security and privacy fixes for
  4384. oldstable. This release is intended only for package maintainers and
  4385. others who cannot use the 0.2.2 stable series. All others should be
  4386. using Tor 0.2.2.x or newer.
  4387. The Tor 0.2.1.x series will reach formal end-of-life some time in
  4388. early 2012; we will stop releasing patches for it then.
  4389. o Major bugfixes (also included in 0.2.2.x):
  4390. - Correctly sanity-check that we don't underflow on a memory
  4391. allocation (and then assert) for hidden service introduction
  4392. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  4393. bugfix on 0.2.1.5-alpha.
  4394. - Fix a heap overflow bug that could occur when trying to pull
  4395. data into the first chunk of a buffer, when that chunk had
  4396. already had some data drained from it. Fixes CVE-2011-2778;
  4397. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  4398. o Minor features:
  4399. - Update to the December 6 2011 Maxmind GeoLite Country database.
  4400. Changes in version 0.2.2.34 - 2011-10-26
  4401. Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
  4402. can deanonymize Tor users. Everybody should upgrade.
  4403. The attack relies on four components: 1) Clients reuse their TLS cert
  4404. when talking to different relays, so relays can recognize a user by
  4405. the identity key in her cert. 2) An attacker who knows the client's
  4406. identity key can probe each guard relay to see if that identity key
  4407. is connected to that guard relay right now. 3) A variety of active
  4408. attacks in the literature (starting from "Low-Cost Traffic Analysis
  4409. of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
  4410. discover the guard relays that a Tor user visiting the website is using.
  4411. 4) Clients typically pick three guards at random, so the set of guards
  4412. for a given user could well be a unique fingerprint for her. This
  4413. release fixes components #1 and #2, which is enough to block the attack;
  4414. the other two remain as open research problems. Special thanks to
  4415. "frosty_un" for reporting the issue to us!
  4416. Clients should upgrade so they are no longer recognizable by the TLS
  4417. certs they present. Relays should upgrade so they no longer allow a
  4418. remote attacker to probe them to test whether unpatched clients are
  4419. currently connected to them.
  4420. This release also fixes several vulnerabilities that allow an attacker
  4421. to enumerate bridge relays. Some bridge enumeration attacks still
  4422. remain; see for example proposal 188.
  4423. o Privacy/anonymity fixes (clients):
  4424. - Clients and bridges no longer send TLS certificate chains on
  4425. outgoing OR connections. Previously, each client or bridge would
  4426. use the same cert chain for all outgoing OR connections until
  4427. its IP address changes, which allowed any relay that the client
  4428. or bridge contacted to determine which entry guards it is using.
  4429. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  4430. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  4431. no longer considers that connection as suitable for satisfying a
  4432. circuit EXTEND request. Now relays can protect clients from the
  4433. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  4434. - Directory authorities no longer assign the Guard flag to relays
  4435. that haven't upgraded to the above "refuse EXTEND requests
  4436. to client connections" fix. Now directory authorities can
  4437. protect clients from the CVE-2011-2768 issue even if neither
  4438. the clients nor the relays have upgraded yet. There's a new
  4439. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  4440. to let us transition smoothly, else tomorrow there would be no
  4441. guard relays.
  4442. o Privacy/anonymity fixes (bridge enumeration):
  4443. - Bridge relays now do their directory fetches inside Tor TLS
  4444. connections, like all the other clients do, rather than connecting
  4445. directly to the DirPort like public relays do. Removes another
  4446. avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
  4447. - Bridges relays now build circuits for themselves in a more similar
  4448. way to how clients build them. Removes another avenue for
  4449. enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
  4450. when bridges were introduced.
  4451. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  4452. that they initiated. Relays could distinguish incoming bridge
  4453. connections from client connections, creating another avenue for
  4454. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  4455. Found by "frosty_un".
  4456. o Major bugfixes:
  4457. - Fix a crash bug when changing node restrictions while a DNS lookup
  4458. is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
  4459. by "Tey'".
  4460. - Don't launch a useless circuit after failing to use one of a
  4461. hidden service's introduction points. Previously, we would
  4462. launch a new introduction circuit, but not set the hidden service
  4463. which that circuit was intended to connect to, so it would never
  4464. actually be used. A different piece of code would then create a
  4465. new introduction circuit correctly. Bug reported by katmagic and
  4466. found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
  4467. o Minor bugfixes:
  4468. - Change an integer overflow check in the OpenBSD_Malloc code so
  4469. that GCC is less likely to eliminate it as impossible. Patch
  4470. from Mansour Moufid. Fixes bug 4059.
  4471. - When a hidden service turns an extra service-side introduction
  4472. circuit into a general-purpose circuit, free the rend_data and
  4473. intro_key fields first, so we won't leak memory if the circuit
  4474. is cannibalized for use as another service-side introduction
  4475. circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
  4476. - Bridges now skip DNS self-tests, to act a little more stealthily.
  4477. Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
  4478. bridges. Patch by "warms0x".
  4479. - Fix internal bug-checking logic that was supposed to catch
  4480. failures in digest generation so that it will fail more robustly
  4481. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  4482. Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
  4483. - Report any failure in init_keys() calls launched because our
  4484. IP address has changed. Spotted by Coverity Scan. Bugfix on
  4485. 0.1.1.4-alpha; fixes CID 484.
  4486. o Minor bugfixes (log messages and documentation):
  4487. - Remove a confusing dollar sign from the example fingerprint in the
  4488. man page, and also make the example fingerprint a valid one. Fixes
  4489. bug 4309; bugfix on 0.2.1.3-alpha.
  4490. - The next version of Windows will be called Windows 8, and it has
  4491. a major version of 6, minor version of 2. Correctly identify that
  4492. version instead of calling it "Very recent version". Resolves
  4493. ticket 4153; reported by funkstar.
  4494. - Downgrade log messages about circuit timeout calibration from
  4495. "notice" to "info": they don't require or suggest any human
  4496. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  4497. bugfix on 0.2.2.14-alpha.
  4498. o Minor features:
  4499. - Turn on directory request statistics by default and include them in
  4500. extra-info descriptors. Don't break if we have no GeoIP database.
  4501. Backported from 0.2.3.1-alpha; implements ticket 3951.
  4502. - Update to the October 4 2011 Maxmind GeoLite Country database.
  4503. Changes in version 0.2.1.31 - 2011-10-26
  4504. Tor 0.2.1.31 backports important security and privacy fixes for
  4505. oldstable. This release is intended only for package maintainers and
  4506. others who cannot use the 0.2.2 stable series. All others should be
  4507. using Tor 0.2.2.x or newer.
  4508. o Security fixes (also included in 0.2.2.x):
  4509. - Replace all potentially sensitive memory comparison operations
  4510. with versions whose runtime does not depend on the data being
  4511. compared. This will help resist a class of attacks where an
  4512. adversary can use variations in timing information to learn
  4513. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  4514. implementation by Robert Ransom based partially on code by DJB.)
  4515. - Fix an assert in parsing router descriptors containing IPv6
  4516. addresses. This one took down the directory authorities when
  4517. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  4518. o Privacy/anonymity fixes (also included in 0.2.2.x):
  4519. - Clients and bridges no longer send TLS certificate chains on
  4520. outgoing OR connections. Previously, each client or bridge would
  4521. use the same cert chain for all outgoing OR connections until
  4522. its IP address changes, which allowed any relay that the client
  4523. or bridge contacted to determine which entry guards it is using.
  4524. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  4525. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  4526. no longer considers that connection as suitable for satisfying a
  4527. circuit EXTEND request. Now relays can protect clients from the
  4528. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  4529. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  4530. that they initiated. Relays could distinguish incoming bridge
  4531. connections from client connections, creating another avenue for
  4532. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  4533. Found by "frosty_un".
  4534. - When receiving a hidden service descriptor, check that it is for
  4535. the hidden service we wanted. Previously, Tor would store any
  4536. hidden service descriptors that a directory gave it, whether it
  4537. wanted them or not. This wouldn't have let an attacker impersonate
  4538. a hidden service, but it did let directories pre-seed a client
  4539. with descriptors that it didn't want. Bugfix on 0.0.6.
  4540. - Avoid linkability based on cached hidden service descriptors: forget
  4541. all hidden service descriptors cached as a client when processing a
  4542. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  4543. - Make the bridge directory authority refuse to answer directory
  4544. requests for "all" descriptors. It used to include bridge
  4545. descriptors in its answer, which was a major information leak.
  4546. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  4547. - Don't attach new streams to old rendezvous circuits after SIGNAL
  4548. NEWNYM. Previously, we would keep using an existing rendezvous
  4549. circuit if it remained open (i.e. if it were kept open by a
  4550. long-lived stream, or if a new stream were attached to it before
  4551. Tor could notice that it was old and no longer in use). Bugfix on
  4552. 0.1.1.15-rc; fixes bug 3375.
  4553. o Minor bugfixes (also included in 0.2.2.x):
  4554. - When we restart our relay, we might get a successful connection
  4555. from the outside before we've started our reachability tests,
  4556. triggering a warning: "ORPort found reachable, but I have no
  4557. routerinfo yet. Failing to inform controller of success." This
  4558. bug was harmless unless Tor is running under a controller
  4559. like Vidalia, in which case the controller would never get a
  4560. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  4561. fixes bug 1172.
  4562. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  4563. enabled. Fixes bug 1526.
  4564. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  4565. anything since 0.2.1.16-rc.
  4566. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  4567. None of the cases where we did this before were wrong, but by making
  4568. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  4569. - Fix a rare crash bug that could occur when a client was configured
  4570. with a large number of bridges. Fixes bug 2629; bugfix on
  4571. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  4572. - Correct the warning displayed when a rendezvous descriptor exceeds
  4573. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  4574. John Brooks.
  4575. - Fix an uncommon assertion failure when running with DNSPort under
  4576. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  4577. - When warning about missing zlib development packages during compile,
  4578. give the correct package names. Bugfix on 0.2.0.1-alpha.
  4579. - Require that introduction point keys and onion keys have public
  4580. exponent 65537. Bugfix on 0.2.0.10-alpha.
  4581. - Do not crash when our configuration file becomes unreadable, for
  4582. example due to a permissions change, between when we start up
  4583. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  4584. on 0.0.9pre6.
  4585. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  4586. Fixes bug 3208.
  4587. - Always NUL-terminate the sun_path field of a sockaddr_un before
  4588. passing it to the kernel. (Not a security issue: kernels are
  4589. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  4590. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  4591. - Don't stack-allocate the list of supplementary GIDs when we're
  4592. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  4593. could take up to 256K, which is way too much stack. Found by
  4594. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  4595. o Minor bugfixes (only in 0.2.1.x):
  4596. - Resume using micro-version numbers in 0.2.1.x: our Debian packages
  4597. rely on them. Bugfix on 0.2.1.30.
  4598. - Use git revisions instead of svn revisions when generating our
  4599. micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  4600. o Minor features (also included in 0.2.2.x):
  4601. - Adjust the expiration time on our SSL session certificates to
  4602. better match SSL certs seen in the wild. Resolves ticket 4014.
  4603. - Allow nameservers with IPv6 address. Resolves bug 2574.
  4604. - Update to the October 4 2011 Maxmind GeoLite Country database.
  4605. Changes in version 0.2.2.33 - 2011-09-13
  4606. Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
  4607. TLS handshake that makes relays and bridges that run this new version
  4608. reachable from Iran again.
  4609. o Major bugfixes:
  4610. - Avoid an assertion failure when reloading a configuration with
  4611. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  4612. 3923; bugfix on 0.2.2.25-alpha.
  4613. o Minor features (security):
  4614. - Check for replays of the public-key encrypted portion of an
  4615. INTRODUCE1 cell, in addition to the current check for replays of
  4616. the g^x value. This prevents a possible class of active attacks
  4617. by an attacker who controls both an introduction point and a
  4618. rendezvous point, and who uses the malleability of AES-CTR to
  4619. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  4620. that these attacks are infeasible (requiring the attacker to send
  4621. on the order of zettabytes of altered cells in a short interval),
  4622. but we'd rather block them off in case there are any classes of
  4623. this attack that we missed. Reported by Willem Pinckaers.
  4624. o Minor features:
  4625. - Adjust the expiration time on our SSL session certificates to
  4626. better match SSL certs seen in the wild. Resolves ticket 4014.
  4627. - Change the default required uptime for a relay to be accepted as
  4628. a HSDir (hidden service directory) from 24 hours to 25 hours.
  4629. Improves on 0.2.0.10-alpha; resolves ticket 2649.
  4630. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  4631. authorities to abstain from voting on assignment of the HSDir
  4632. consensus flag. Related to bug 2649.
  4633. - Update to the September 6 2011 Maxmind GeoLite Country database.
  4634. o Minor bugfixes (documentation and log messages):
  4635. - Correct the man page to explain that HashedControlPassword and
  4636. CookieAuthentication can both be set, in which case either method
  4637. is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
  4638. when we decided to allow these config options to both be set. Issue
  4639. raised by bug 3898.
  4640. - Demote the 'replay detected' log message emitted when a hidden
  4641. service receives the same Diffie-Hellman public key in two different
  4642. INTRODUCE2 cells to info level. A normal Tor client can cause that
  4643. log message during its normal operation. Bugfix on 0.2.1.6-alpha;
  4644. fixes part of bug 2442.
  4645. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  4646. level. There is nothing that a hidden service's operator can do
  4647. to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
  4648. of bug 2442.
  4649. - Clarify a log message specifying the characters permitted in
  4650. HiddenServiceAuthorizeClient client names. Previously, the log
  4651. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  4652. given the impression that every ASCII character between "+" and "_"
  4653. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
  4654. o Build fixes:
  4655. - Provide a substitute implementation of lround() for MSVC, which
  4656. apparently lacks it. Patch from Gisle Vanem.
  4657. - Clean up some code issues that prevented Tor from building on older
  4658. BSDs. Fixes bug 3894; reported by "grarpamp".
  4659. - Search for a platform-specific version of "ar" when cross-compiling.
  4660. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  4661. Changes in version 0.2.2.32 - 2011-08-27
  4662. The Tor 0.2.2 release series is dedicated to the memory of Andreas
  4663. Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
  4664. a founder of the PETS community, a leader in our field, a mentor,
  4665. and a friend. He left us with these words: "I had the possibility
  4666. to contribute to this world that is not as it should be. I hope I
  4667. could help in some areas to make the world a better place, and that
  4668. I could also encourage other people to be engaged in improving the
  4669. world. Please, stay engaged. This world needs you, your love, your
  4670. initiative -- now I cannot be part of that anymore."
  4671. Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
  4672. ready. More than two years in the making, this release features improved
  4673. client performance and hidden service reliability, better compatibility
  4674. for Android, correct behavior for bridges that listen on more than
  4675. one address, more extensible and flexible directory object handling,
  4676. better reporting of network statistics, improved code security, and
  4677. many many other features and bugfixes.
  4678. o Major features (client performance):
  4679. - When choosing which cells to relay first, relays now favor circuits
  4680. that have been quiet recently, to provide lower latency for
  4681. low-volume circuits. By default, relays enable or disable this
  4682. feature based on a setting in the consensus. They can override
  4683. this default by using the new "CircuitPriorityHalflife" config
  4684. option. Design and code by Ian Goldberg, Can Tang, and Chris
  4685. Alexander.
  4686. - Directory authorities now compute consensus weightings that instruct
  4687. clients how to weight relays flagged as Guard, Exit, Guard+Exit,
  4688. and no flag. Clients use these weightings to distribute network load
  4689. more evenly across these different relay types. The weightings are
  4690. in the consensus so we can change them globally in the future. Extra
  4691. thanks to "outofwords" for finding some nasty security bugs in
  4692. the first implementation of this feature.
  4693. o Major features (client performance, circuit build timeout):
  4694. - Tor now tracks how long it takes to build client-side circuits
  4695. over time, and adapts its timeout to local network performance.
  4696. Since a circuit that takes a long time to build will also provide
  4697. bad performance, we get significant latency improvements by
  4698. discarding the slowest 20% of circuits. Specifically, Tor creates
  4699. circuits more aggressively than usual until it has enough data
  4700. points for a good timeout estimate. Implements proposal 151.
  4701. - Circuit build timeout constants can be controlled by consensus
  4702. parameters. We set good defaults for these parameters based on
  4703. experimentation on broadband and simulated high-latency links.
  4704. - Circuit build time learning can be disabled via consensus parameter
  4705. or by the client via a LearnCircuitBuildTimeout config option. We
  4706. also automatically disable circuit build time calculation if either
  4707. AuthoritativeDirectory is set, or if we fail to write our state
  4708. file. Implements ticket 1296.
  4709. o Major features (relays use their capacity better):
  4710. - Set SO_REUSEADDR socket option on all sockets, not just
  4711. listeners. This should help busy exit nodes avoid running out of
  4712. useable ports just because all the ports have been used in the
  4713. near past. Resolves issue 2850.
  4714. - Relays now save observed peak bandwidth throughput rates to their
  4715. state file (along with total usage, which was already saved),
  4716. so that they can determine their correct estimated bandwidth on
  4717. restart. Resolves bug 1863, where Tor relays would reset their
  4718. estimated bandwidth to 0 after restarting.
  4719. - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
  4720. should give us approximately 40-50% more Guard-flagged nodes,
  4721. improving the anonymity the Tor network can provide and also
  4722. decreasing the dropoff in throughput that relays experience when
  4723. they first get the Guard flag.
  4724. - Directory authorities now take changes in router IP address and
  4725. ORPort into account when determining router stability. Previously,
  4726. if a router changed its IP or ORPort, the authorities would not
  4727. treat it as having any downtime for the purposes of stability
  4728. calculation, whereas clients would experience downtime since the
  4729. change would take a while to propagate to them. Resolves issue 1035.
  4730. - New AccelName and AccelDir options add support for dynamic OpenSSL
  4731. hardware crypto acceleration engines.
  4732. o Major features (relays control their load better):
  4733. - Exit relays now try harder to block exit attempts from unknown
  4734. relays, to make it harder for people to use them as one-hop proxies
  4735. a la tortunnel. Controlled by the refuseunknownexits consensus
  4736. parameter (currently enabled), or you can override it on your
  4737. relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
  4738. based on a variant of proposal 163.
  4739. - Add separate per-conn write limiting to go with the per-conn read
  4740. limiting. We added a global write limit in Tor 0.1.2.5-alpha,
  4741. but never per-conn write limits.
  4742. - New consensus params "bwconnrate" and "bwconnburst" to let us
  4743. rate-limit client connections as they enter the network. It's
  4744. controlled in the consensus so we can turn it on and off for
  4745. experiments. It's starting out off. Based on proposal 163.
  4746. o Major features (controllers):
  4747. - Export GeoIP information on bridge usage to controllers even if we
  4748. have not yet been running for 24 hours. Now Vidalia bridge operators
  4749. can get more accurate and immediate feedback about their
  4750. contributions to the network.
  4751. - Add an __OwningControllerProcess configuration option and a
  4752. TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
  4753. that when it exits, Tor will shut down. Implements feature 3049.
  4754. o Major features (directory authorities):
  4755. - Directory authorities now create, vote on, and serve multiple
  4756. parallel formats of directory data as part of their voting process.
  4757. Partially implements Proposal 162: "Publish the consensus in
  4758. multiple flavors".
  4759. - Directory authorities now agree on and publish small summaries
  4760. of router information that clients can use in place of regular
  4761. server descriptors. This transition will allow Tor 0.2.3 clients
  4762. to use far less bandwidth for downloading information about the
  4763. network. Begins the implementation of Proposal 158: "Clients
  4764. download consensus + microdescriptors".
  4765. - The directory voting system is now extensible to use multiple hash
  4766. algorithms for signatures and resource selection. Newer formats
  4767. are signed with SHA256, with a possibility for moving to a better
  4768. hash algorithm in the future.
  4769. - Directory authorities can now vote on arbitary integer values as
  4770. part of the consensus process. This is designed to help set
  4771. network-wide parameters. Implements proposal 167.
  4772. o Major features and bugfixes (node selection):
  4773. - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
  4774. ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
  4775. options. Previously, we had been ambiguous in describing what
  4776. counted as an "exit" node, and what operations exactly "StrictNodes
  4777. 0" would permit. This created confusion when people saw nodes built
  4778. through unexpected circuits, and made it hard to tell real bugs from
  4779. surprises. Now the intended behavior is:
  4780. . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
  4781. a node that delivers user traffic outside the Tor network.
  4782. . "Entry", in the context of EntryNodes, means a node used as the
  4783. first hop of a multihop circuit. It doesn't include direct
  4784. connections to directory servers.
  4785. . "ExcludeNodes" applies to all nodes.
  4786. . "StrictNodes" changes the behavior of ExcludeNodes only. When
  4787. StrictNodes is set, Tor should avoid all nodes listed in
  4788. ExcludeNodes, even when it will make user requests fail. When
  4789. StrictNodes is *not* set, then Tor should follow ExcludeNodes
  4790. whenever it can, except when it must use an excluded node to
  4791. perform self-tests, connect to a hidden service, provide a
  4792. hidden service, fulfill a .exit request, upload directory
  4793. information, or fetch directory information.
  4794. Collectively, the changes to implement the behavior fix bug 1090.
  4795. - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
  4796. change during a config reload, mark and discard all our origin
  4797. circuits. This fix should address edge cases where we change the
  4798. config options and but then choose a circuit that we created before
  4799. the change.
  4800. - Make EntryNodes config option much more aggressive even when
  4801. StrictNodes is not set. Before it would prepend your requested
  4802. entrynodes to your list of guard nodes, but feel free to use others
  4803. after that. Now it chooses only from your EntryNodes if any of
  4804. those are available, and only falls back to others if a) they're
  4805. all down and b) StrictNodes is not set.
  4806. - Now we refresh your entry guards from EntryNodes at each consensus
  4807. fetch -- rather than just at startup and then they slowly rot as
  4808. the network changes.
  4809. - Add support for the country code "{??}" in torrc options like
  4810. ExcludeNodes, to indicate all routers of unknown country. Closes
  4811. bug 1094.
  4812. - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
  4813. a node is listed in both, it's treated as excluded.
  4814. - ExcludeNodes now applies to directory nodes -- as a preference if
  4815. StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
  4816. Don't exclude all the directory authorities and set StrictNodes to 1
  4817. unless you really want your Tor to break.
  4818. - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
  4819. - ExcludeExitNodes now overrides .exit requests.
  4820. - We don't use bridges listed in ExcludeNodes.
  4821. - When StrictNodes is 1:
  4822. . We now apply ExcludeNodes to hidden service introduction points
  4823. and to rendezvous points selected by hidden service users. This
  4824. can make your hidden service less reliable: use it with caution!
  4825. . If we have used ExcludeNodes on ourself, do not try relay
  4826. reachability self-tests.
  4827. . If we have excluded all the directory authorities, we will not
  4828. even try to upload our descriptor if we're a relay.
  4829. . Do not honor .exit requests to an excluded node.
  4830. - When the set of permitted nodes changes, we now remove any mappings
  4831. introduced via TrackExitHosts to now-excluded nodes. Bugfix on
  4832. 0.1.0.1-rc.
  4833. - We never cannibalize a circuit that had excluded nodes on it, even
  4834. if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
  4835. - Improve log messages related to excluded nodes.
  4836. o Major features (misc):
  4837. - Numerous changes, bugfixes, and workarounds from Nathan Freitas
  4838. to help Tor build correctly for Android phones.
  4839. - The options SocksPort, ControlPort, and so on now all accept a
  4840. value "auto" that opens a socket on an OS-selected port. A
  4841. new ControlPortWriteToFile option tells Tor to write its
  4842. actual control port or ports to a chosen file. If the option
  4843. ControlPortFileGroupReadable is set, the file is created as
  4844. group-readable. Now users can run two Tor clients on the same
  4845. system without needing to manually mess with parameters. Resolves
  4846. part of ticket 3076.
  4847. - Tor now supports tunneling all of its outgoing connections over
  4848. a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
  4849. configuration options. Code by Christopher Davis.
  4850. o Code security improvements:
  4851. - Replace all potentially sensitive memory comparison operations
  4852. with versions whose runtime does not depend on the data being
  4853. compared. This will help resist a class of attacks where an
  4854. adversary can use variations in timing information to learn
  4855. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  4856. implementation by Robert Ransom based partially on code by DJB.)
  4857. - Enable Address Space Layout Randomization (ASLR) and Data Execution
  4858. Prevention (DEP) by default on Windows to make it harder for
  4859. attackers to exploit vulnerabilities. Patch from John Brooks.
  4860. - New "--enable-gcc-hardening" ./configure flag (off by default)
  4861. to turn on gcc compile time hardening options. It ensures
  4862. that signed ints have defined behavior (-fwrapv), enables
  4863. -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
  4864. with canaries (-fstack-protector-all), turns on ASLR protection if
  4865. supported by the kernel (-fPIE, -pie), and adds additional security
  4866. related warnings. Verified to work on Mac OS X and Debian Lenny.
  4867. - New "--enable-linker-hardening" ./configure flag (off by default)
  4868. to turn on ELF specific hardening features (relro, now). This does
  4869. not work with Mac OS X or any other non-ELF binary format.
  4870. - Always search the Windows system directory for system DLLs, and
  4871. nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
  4872. - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
  4873. current and future memory pages via mlockall(). On supported
  4874. platforms (modern Linux and probably BSD but not Windows or OS X),
  4875. this should effectively disable any and all attempts to page out
  4876. memory. This option requires that you start your Tor as root --
  4877. if you use DisableAllSwap, please consider using the User option
  4878. to properly reduce the privileges of your Tor.
  4879. o Major bugfixes (crashes):
  4880. - Fix crash bug on platforms where gmtime and localtime can return
  4881. NULL. Windows 7 users were running into this one. Fixes part of bug
  4882. 2077. Bugfix on all versions of Tor. Found by boboper.
  4883. - Introduce minimum/maximum values that clients will believe
  4884. from the consensus. Now we'll have a better chance to avoid crashes
  4885. or worse when a consensus param has a weird value.
  4886. - Fix a rare crash bug that could occur when a client was configured
  4887. with a large number of bridges. Fixes bug 2629; bugfix on
  4888. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  4889. - Do not crash when our configuration file becomes unreadable, for
  4890. example due to a permissions change, between when we start up
  4891. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  4892. on 0.0.9pre6.
  4893. - If we're in the pathological case where there's no exit bandwidth
  4894. but there is non-exit bandwidth, or no guard bandwidth but there
  4895. is non-guard bandwidth, don't crash during path selection. Bugfix
  4896. on 0.2.0.3-alpha.
  4897. - Fix a crash bug when trying to initialize the evdns module in
  4898. Libevent 2. Bugfix on 0.2.1.16-rc.
  4899. o Major bugfixes (stability):
  4900. - Fix an assert in parsing router descriptors containing IPv6
  4901. addresses. This one took down the directory authorities when
  4902. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  4903. - Fix an uncommon assertion failure when running with DNSPort under
  4904. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  4905. - Treat an unset $HOME like an empty $HOME rather than triggering an
  4906. assert. Bugfix on 0.0.8pre1; fixes bug 1522.
  4907. - More gracefully handle corrupt state files, removing asserts
  4908. in favor of saving a backup and resetting state.
  4909. - Instead of giving an assertion failure on an internal mismatch
  4910. on estimated freelist size, just log a BUG warning and try later.
  4911. Mitigates but does not fix bug 1125.
  4912. - Fix an assert that got triggered when using the TestingTorNetwork
  4913. configuration option and then issuing a GETINFO config-text control
  4914. command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
  4915. - If the cached cert file is unparseable, warn but don't exit.
  4916. o Privacy fixes (relays/bridges):
  4917. - Don't list Windows capabilities in relay descriptors. We never made
  4918. use of them, and maybe it's a bad idea to publish them. Bugfix
  4919. on 0.1.1.8-alpha.
  4920. - If the Nickname configuration option isn't given, Tor would pick a
  4921. nickname based on the local hostname as the nickname for a relay.
  4922. Because nicknames are not very important in today's Tor and the
  4923. "Unnamed" nickname has been implemented, this is now problematic
  4924. behavior: It leaks information about the hostname without being
  4925. useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
  4926. introduced the Unnamed nickname. Reported by tagnaq.
  4927. - Maintain separate TLS contexts and certificates for incoming and
  4928. outgoing connections in bridge relays. Previously we would use the
  4929. same TLS contexts and certs for incoming and outgoing connections.
  4930. Bugfix on 0.2.0.3-alpha; addresses bug 988.
  4931. - Maintain separate identity keys for incoming and outgoing TLS
  4932. contexts in bridge relays. Previously we would use the same
  4933. identity keys for incoming and outgoing TLS contexts. Bugfix on
  4934. 0.2.0.3-alpha; addresses the other half of bug 988.
  4935. - Make the bridge directory authority refuse to answer directory
  4936. requests for "all descriptors". It used to include bridge
  4937. descriptors in its answer, which was a major information leak.
  4938. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  4939. o Privacy fixes (clients):
  4940. - When receiving a hidden service descriptor, check that it is for
  4941. the hidden service we wanted. Previously, Tor would store any
  4942. hidden service descriptors that a directory gave it, whether it
  4943. wanted them or not. This wouldn't have let an attacker impersonate
  4944. a hidden service, but it did let directories pre-seed a client
  4945. with descriptors that it didn't want. Bugfix on 0.0.6.
  4946. - Start the process of disabling ".exit" address notation, since it
  4947. can be used for a variety of esoteric application-level attacks
  4948. on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
  4949. on 0.0.9rc5.
  4950. - Reject attempts at the client side to open connections to private
  4951. IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
  4952. a randomly chosen exit node. Attempts to do so are always
  4953. ill-defined, generally prevented by exit policies, and usually
  4954. in error. This will also help to detect loops in transparent
  4955. proxy configurations. You can disable this feature by setting
  4956. "ClientRejectInternalAddresses 0" in your torrc.
  4957. - Log a notice when we get a new control connection. Now it's easier
  4958. for security-conscious users to recognize when a local application
  4959. is knocking on their controller door. Suggested by bug 1196.
  4960. o Privacy fixes (newnym):
  4961. - Avoid linkability based on cached hidden service descriptors: forget
  4962. all hidden service descriptors cached as a client when processing a
  4963. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  4964. - On SIGHUP, do not clear out all TrackHostExits mappings, client
  4965. DNS cache entries, and virtual address mappings: that's what
  4966. NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
  4967. - Don't attach new streams to old rendezvous circuits after SIGNAL
  4968. NEWNYM. Previously, we would keep using an existing rendezvous
  4969. circuit if it remained open (i.e. if it were kept open by a
  4970. long-lived stream, or if a new stream were attached to it before
  4971. Tor could notice that it was old and no longer in use). Bugfix on
  4972. 0.1.1.15-rc; fixes bug 3375.
  4973. o Major bugfixes (relay bandwidth accounting):
  4974. - Fix a bug that could break accounting on 64-bit systems with large
  4975. time_t values, making them hibernate for impossibly long intervals.
  4976. Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
  4977. - Fix a bug in bandwidth accounting that could make us use twice
  4978. the intended bandwidth when our interval start changes due to
  4979. daylight saving time. Now we tolerate skew in stored vs computed
  4980. interval starts: if the start of the period changes by no more than
  4981. 50% of the period's duration, we remember bytes that we transferred
  4982. in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
  4983. o Major bugfixes (bridges):
  4984. - Bridges now use "reject *:*" as their default exit policy. Bugfix
  4985. on 0.2.0.3-alpha. Fixes bug 1113.
  4986. - If you configure your bridge with a known identity fingerprint,
  4987. and the bridge authority is unreachable (as it is in at least
  4988. one country now), fall back to directly requesting the descriptor
  4989. from the bridge. Finishes the feature started in 0.2.0.10-alpha;
  4990. closes bug 1138.
  4991. - Fix a bug where bridge users who configure the non-canonical
  4992. address of a bridge automatically switch to its canonical
  4993. address. If a bridge listens at more than one address, it
  4994. should be able to advertise those addresses independently and
  4995. any non-blocked addresses should continue to work. Bugfix on Tor
  4996. 0.2.0.3-alpha. Fixes bug 2510.
  4997. - If you configure Tor to use bridge A, and then quit and
  4998. configure Tor to use bridge B instead (or if you change Tor
  4999. to use bridge B via the controller), it would happily continue
  5000. to use bridge A if it's still reachable. While this behavior is
  5001. a feature if your goal is connectivity, in some scenarios it's a
  5002. dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
  5003. - When the controller configures a new bridge, don't wait 10 to 60
  5004. seconds before trying to fetch its descriptor. Bugfix on
  5005. 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
  5006. o Major bugfixes (directory authorities):
  5007. - Many relays have been falling out of the consensus lately because
  5008. not enough authorities know about their descriptor for them to get
  5009. a majority of votes. When we deprecated the v2 directory protocol,
  5010. we got rid of the only way that v3 authorities can hear from each
  5011. other about other descriptors. Now authorities examine every v3
  5012. vote for new descriptors, and fetch them from that authority. Bugfix
  5013. on 0.2.1.23.
  5014. - Authorities could be tricked into giving out the Exit flag to relays
  5015. that didn't allow exiting to any ports. This bug could screw
  5016. with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
  5017. 1238. Bug discovered by Martin Kowalczyk.
  5018. - If all authorities restart at once right before a consensus vote,
  5019. nobody will vote about "Running", and clients will get a consensus
  5020. with no usable relays. Instead, authorities refuse to build a
  5021. consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
  5022. o Major bugfixes (stream-level fairness):
  5023. - When receiving a circuit-level SENDME for a blocked circuit, try
  5024. to package cells fairly from all the streams that had previously
  5025. been blocked on that circuit. Previously, we had started with the
  5026. oldest stream, and allowed each stream to potentially exhaust
  5027. the circuit's package window. This gave older streams on any
  5028. given circuit priority over newer ones. Fixes bug 1937. Detected
  5029. originally by Camilo Viecco. This bug was introduced before the
  5030. first Tor release, in svn commit r152: it is the new winner of
  5031. the longest-lived bug prize.
  5032. - Fix a stream fairness bug that would cause newer streams on a given
  5033. circuit to get preference when reading bytes from the origin or
  5034. destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
  5035. introduced before the first Tor release, in svn revision r152.
  5036. - When the exit relay got a circuit-level sendme cell, it started
  5037. reading on the exit streams, even if had 500 cells queued in the
  5038. circuit queue already, so the circuit queue just grew and grew in
  5039. some cases. We fix this by not re-enabling reading on receipt of a
  5040. sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
  5041. on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
  5042. "yetonetime".
  5043. - Newly created streams were allowed to read cells onto circuits,
  5044. even if the circuit's cell queue was blocked and waiting to drain.
  5045. This created potential unfairness, as older streams would be
  5046. blocked, but newer streams would gladly fill the queue completely.
  5047. We add code to detect this situation and prevent any stream from
  5048. getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
  5049. fixes bug 1298.
  5050. o Major bugfixes (hidden services):
  5051. - Apply circuit timeouts to opened hidden-service-related circuits
  5052. based on the correct start time. Previously, we would apply the
  5053. circuit build timeout based on time since the circuit's creation;
  5054. it was supposed to be applied based on time since the circuit
  5055. entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
  5056. - Improve hidden service robustness: When we find that we have
  5057. extended a hidden service's introduction circuit to a relay not
  5058. listed as an introduction point in the HS descriptor we currently
  5059. have, retry with an introduction point from the current
  5060. descriptor. Previously we would just give up. Fixes bugs 1024 and
  5061. 1930; bugfix on 0.2.0.10-alpha.
  5062. - Directory authorities now use data collected from their own
  5063. uptime observations when choosing whether to assign the HSDir flag
  5064. to relays, instead of trusting the uptime value the relay reports in
  5065. its descriptor. This change helps prevent an attack where a small
  5066. set of nodes with frequently-changing identity keys can blackhole
  5067. a hidden service. (Only authorities need upgrade; others will be
  5068. fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
  5069. - Stop assigning the HSDir flag to relays that disable their
  5070. DirPort (and thus will refuse to answer directory requests). This
  5071. fix should dramatically improve the reachability of hidden services:
  5072. hidden services and hidden service clients pick six HSDir relays
  5073. to store and retrieve the hidden service descriptor, and currently
  5074. about half of the HSDir relays will refuse to work. Bugfix on
  5075. 0.2.0.10-alpha; fixes part of bug 1693.
  5076. o Major bugfixes (misc):
  5077. - Clients now stop trying to use an exit node associated with a given
  5078. destination by TrackHostExits if they fail to reach that exit node.
  5079. Fixes bug 2999. Bugfix on 0.2.0.20-rc.
  5080. - Fix a regression that caused Tor to rebind its ports if it receives
  5081. SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
  5082. - Remove an extra pair of quotation marks around the error
  5083. message in control-port STATUS_GENERAL BUG events. Bugfix on
  5084. 0.1.2.6-alpha; fixes bug 3732.
  5085. o Minor features (relays):
  5086. - Ensure that no empty [dirreq-](read|write)-history lines are added
  5087. to an extrainfo document. Implements ticket 2497.
  5088. - When bandwidth accounting is enabled, be more generous with how
  5089. much bandwidth we'll use up before entering "soft hibernation".
  5090. Previously, we'd refuse new connections and circuits once we'd
  5091. used up 95% of our allotment. Now, we use up 95% of our allotment,
  5092. AND make sure that we have no more than 500MB (or 3 hours of
  5093. expected traffic, whichever is lower) remaining before we enter
  5094. soft hibernation.
  5095. - Relays now log the reason for publishing a new relay descriptor,
  5096. so we have a better chance of hunting down instances of bug 1810.
  5097. Resolves ticket 3252.
  5098. - Log a little more clearly about the times at which we're no longer
  5099. accepting new connections (e.g. due to hibernating). Resolves
  5100. bug 2181.
  5101. - When AllowSingleHopExits is set, print a warning to explain to the
  5102. relay operator why most clients are avoiding her relay.
  5103. - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
  5104. Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
  5105. clients are already deprecated because of security bugs.
  5106. o Minor features (network statistics):
  5107. - Directory mirrors that set "DirReqStatistics 1" write statistics
  5108. about directory requests to disk every 24 hours. As compared to the
  5109. "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
  5110. improvements: 1) stats are written to disk exactly every 24 hours;
  5111. 2) estimated shares of v2 and v3 requests are determined as mean
  5112. values, not at the end of a measurement period; 3) unresolved
  5113. requests are listed with country code '??'; 4) directories also
  5114. measure download times.
  5115. - Exit nodes that set "ExitPortStatistics 1" write statistics on the
  5116. number of exit streams and transferred bytes per port to disk every
  5117. 24 hours.
  5118. - Relays that set "CellStatistics 1" write statistics on how long
  5119. cells spend in their circuit queues to disk every 24 hours.
  5120. - Entry nodes that set "EntryStatistics 1" write statistics on the
  5121. rough number and origins of connecting clients to disk every 24
  5122. hours.
  5123. - Relays that write any of the above statistics to disk and set
  5124. "ExtraInfoStatistics 1" include the past 24 hours of statistics in
  5125. their extra-info documents. Implements proposal 166.
  5126. o Minor features (GeoIP and statistics):
  5127. - Provide a log message stating which geoip file we're parsing
  5128. instead of just stating that we're parsing the geoip file.
  5129. Implements ticket 2432.
  5130. - Make sure every relay writes a state file at least every 12 hours.
  5131. Previously, a relay could go for weeks without writing its state
  5132. file, and on a crash could lose its bandwidth history, capacity
  5133. estimates, client country statistics, and so on. Addresses bug 3012.
  5134. - Relays report the number of bytes spent on answering directory
  5135. requests in extra-info descriptors similar to {read,write}-history.
  5136. Implements enhancement 1790.
  5137. - Report only the top 10 ports in exit-port stats in order not to
  5138. exceed the maximum extra-info descriptor length of 50 KB. Implements
  5139. task 2196.
  5140. - If writing the state file to disk fails, wait up to an hour before
  5141. retrying again, rather than trying again each second. Fixes bug
  5142. 2346; bugfix on Tor 0.1.1.3-alpha.
  5143. - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
  5144. when we switch from being a public relay to a bridge. Otherwise
  5145. there will still be clients that see the relay in their consensus,
  5146. and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
  5147. bug 932.
  5148. - Update to the August 2 2011 Maxmind GeoLite Country database.
  5149. o Minor features (clients):
  5150. - When expiring circuits, use microsecond timers rather than
  5151. one-second timers. This can avoid an unpleasant situation where a
  5152. circuit is launched near the end of one second and expired right
  5153. near the beginning of the next, and prevent fluctuations in circuit
  5154. timeout values.
  5155. - If we've configured EntryNodes and our network goes away and/or all
  5156. our entrynodes get marked down, optimistically retry them all when
  5157. a new socks application request appears. Fixes bug 1882.
  5158. - Always perform router selections using weighted relay bandwidth,
  5159. even if we don't need a high capacity circuit at the time. Non-fast
  5160. circuits now only differ from fast ones in that they can use relays
  5161. not marked with the Fast flag. This "feature" could turn out to
  5162. be a horrible bug; we should investigate more before it goes into
  5163. a stable release.
  5164. - When we run out of directory information such that we can't build
  5165. circuits, but then get enough that we can build circuits, log when
  5166. we actually construct a circuit, so the user has a better chance of
  5167. knowing what's going on. Fixes bug 1362.
  5168. - Log SSL state transitions at debug level during handshake, and
  5169. include SSL states in error messages. This may help debug future
  5170. SSL handshake issues.
  5171. o Minor features (directory authorities):
  5172. - When a router changes IP address or port, authorities now launch
  5173. a new reachability test for it. Implements ticket 1899.
  5174. - Directory authorities now reject relays running any versions of
  5175. Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
  5176. known bugs that keep RELAY_EARLY cells from working on rendezvous
  5177. circuits. Followup to fix for bug 2081.
  5178. - Directory authorities now reject relays running any version of Tor
  5179. older than 0.2.0.26-rc. That version is the earliest that fetches
  5180. current directory information correctly. Fixes bug 2156.
  5181. - Directory authorities now do an immediate reachability check as soon
  5182. as they hear about a new relay. This change should slightly reduce
  5183. the time between setting up a relay and getting listed as running
  5184. in the consensus. It should also improve the time between setting
  5185. up a bridge and seeing use by bridge users.
  5186. - Directory authorities no longer launch a TLS connection to every
  5187. relay as they startup. Now that we have 2k+ descriptors cached,
  5188. the resulting network hiccup is becoming a burden. Besides,
  5189. authorities already avoid voting about Running for the first half
  5190. hour of their uptime.
  5191. - Directory authorities now log the source of a rejected POSTed v3
  5192. networkstatus vote, so we can track failures better.
  5193. - Backport code from 0.2.3.x that allows directory authorities to
  5194. clean their microdescriptor caches. Needed to resolve bug 2230.
  5195. o Minor features (hidden services):
  5196. - Use computed circuit-build timeouts to decide when to launch
  5197. parallel introduction circuits for hidden services. (Previously,
  5198. we would retry after 15 seconds.)
  5199. - Don't allow v0 hidden service authorities to act as clients.
  5200. Required by fix for bug 3000.
  5201. - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
  5202. by fix for bug 3000.
  5203. - Make hidden services work better in private Tor networks by not
  5204. requiring any uptime to join the hidden service descriptor
  5205. DHT. Implements ticket 2088.
  5206. - Log (at info level) when purging pieces of hidden-service-client
  5207. state because of SIGNAL NEWNYM.
  5208. o Minor features (controller interface):
  5209. - New "GETINFO net/listeners/(type)" controller command to return
  5210. a list of addresses and ports that are bound for listeners for a
  5211. given connection type. This is useful when the user has configured
  5212. "SocksPort auto" and the controller needs to know which port got
  5213. chosen. Resolves another part of ticket 3076.
  5214. - Have the controller interface give a more useful message than
  5215. "Internal Error" in response to failed GETINFO requests.
  5216. - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
  5217. event, to give information on the current rate of circuit timeouts
  5218. over our stored history.
  5219. - The 'EXTENDCIRCUIT' control port command can now be used with
  5220. a circ id of 0 and no path. This feature will cause Tor to build
  5221. a new 'fast' general purpose circuit using its own path selection
  5222. algorithms.
  5223. - Added a BUILDTIMEOUT_SET controller event to describe changes
  5224. to the circuit build timeout.
  5225. - New controller command "getinfo config-text". It returns the
  5226. contents that Tor would write if you send it a SAVECONF command,
  5227. so the controller can write the file to disk itself.
  5228. o Minor features (controller protocol):
  5229. - Add a new ControlSocketsGroupWritable configuration option: when
  5230. it is turned on, ControlSockets are group-writeable by the default
  5231. group of the current user. Patch by Jérémy Bobbio; implements
  5232. ticket 2972.
  5233. - Tor now refuses to create a ControlSocket in a directory that is
  5234. world-readable (or group-readable if ControlSocketsGroupWritable
  5235. is 0). This is necessary because some operating systems do not
  5236. enforce permissions on an AF_UNIX sockets. Permissions on the
  5237. directory holding the socket, however, seems to work everywhere.
  5238. - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
  5239. not. This would lead to a cookie that is still not group readable.
  5240. Closes bug 1843. Suggested by katmagic.
  5241. - Future-proof the controller protocol a bit by ignoring keyword
  5242. arguments we do not recognize.
  5243. o Minor features (more useful logging):
  5244. - Revise most log messages that refer to nodes by nickname to
  5245. instead use the "$key=nickname at address" format. This should be
  5246. more useful, especially since nicknames are less and less likely
  5247. to be unique. Resolves ticket 3045.
  5248. - When an HTTPS proxy reports "403 Forbidden", we now explain
  5249. what it means rather than calling it an unexpected status code.
  5250. Closes bug 2503. Patch from Michael Yakubovich.
  5251. - Rate-limit a warning about failures to download v2 networkstatus
  5252. documents. Resolves part of bug 1352.
  5253. - Rate-limit the "your application is giving Tor only an IP address"
  5254. warning. Addresses bug 2000; bugfix on 0.0.8pre2.
  5255. - Rate-limit "Failed to hand off onionskin" warnings.
  5256. - When logging a rate-limited warning, we now mention how many messages
  5257. got suppressed since the last warning.
  5258. - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
  5259. 2 no signature, 4 required" messages about consensus signatures
  5260. easier to read, and make sure they get logged at the same severity
  5261. as the messages explaining which keys are which. Fixes bug 1290.
  5262. - Don't warn when we have a consensus that we can't verify because
  5263. of missing certificates, unless those certificates are ones
  5264. that we have been trying and failing to download. Fixes bug 1145.
  5265. o Minor features (log domains):
  5266. - Add documentation for configuring logging at different severities in
  5267. different log domains. We've had this feature since 0.2.1.1-alpha,
  5268. but for some reason it never made it into the manpage. Fixes
  5269. bug 2215.
  5270. - Make it simpler to specify "All log domains except for A and B".
  5271. Previously you needed to say "[*,~A,~B]". Now you can just say
  5272. "[~A,~B]".
  5273. - Add a "LogMessageDomains 1" option to include the domains of log
  5274. messages along with the messages. Without this, there's no way
  5275. to use log domains without reading the source or doing a lot
  5276. of guessing.
  5277. - Add a new "Handshake" log domain for activities that happen
  5278. during the TLS handshake.
  5279. o Minor features (build process):
  5280. - Make compilation with clang possible when using
  5281. "--enable-gcc-warnings" by removing two warning options that clang
  5282. hasn't implemented yet and by fixing a few warnings. Resolves
  5283. ticket 2696.
  5284. - Detect platforms that brokenly use a signed size_t, and refuse to
  5285. build there. Found and analyzed by doorss and rransom.
  5286. - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
  5287. Resolves bug 2314.
  5288. - Add support for statically linking zlib by specifying
  5289. "--enable-static-zlib", to go with our support for statically
  5290. linking openssl and libevent. Resolves bug 1358.
  5291. - Instead of adding the svn revision to the Tor version string, report
  5292. the git commit (when we're building from a git checkout).
  5293. - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
  5294. system headers.
  5295. - New --digests command-line switch to output the digests of the
  5296. source files Tor was built with.
  5297. - Generate our manpage and HTML documentation using Asciidoc. This
  5298. change should make it easier to maintain the documentation, and
  5299. produce nicer HTML. The build process fails if asciidoc cannot
  5300. be found and building with asciidoc isn't disabled (via the
  5301. "--disable-asciidoc" argument to ./configure. Skipping the manpage
  5302. speeds up the build considerably.
  5303. o Minor features (options / torrc):
  5304. - Warn when the same option is provided more than once in a torrc
  5305. file, on the command line, or in a single SETCONF statement, and
  5306. the option is one that only accepts a single line. Closes bug 1384.
  5307. - Warn when the user configures two HiddenServiceDir lines that point
  5308. to the same directory. Bugfix on 0.0.6 (the version introducing
  5309. HiddenServiceDir); fixes bug 3289.
  5310. - Add new "perconnbwrate" and "perconnbwburst" consensus params to
  5311. do individual connection-level rate limiting of clients. The torrc
  5312. config options with the same names trump the consensus params, if
  5313. both are present. Replaces the old "bwconnrate" and "bwconnburst"
  5314. consensus params which were broken from 0.2.2.7-alpha through
  5315. 0.2.2.14-alpha. Closes bug 1947.
  5316. - New config option "WarnUnsafeSocks 0" disables the warning that
  5317. occurs whenever Tor receives a socks handshake using a version of
  5318. the socks protocol that can only provide an IP address (rather
  5319. than a hostname). Setups that do DNS locally over Tor are fine,
  5320. and we shouldn't spam the logs in that case.
  5321. - New config option "CircuitStreamTimeout" to override our internal
  5322. timeout schedule for how many seconds until we detach a stream from
  5323. a circuit and try a new circuit. If your network is particularly
  5324. slow, you might want to set this to a number like 60.
  5325. - New options for SafeLogging to allow scrubbing only log messages
  5326. generated while acting as a relay. Specify "SafeLogging relay" if
  5327. you want to ensure that only messages known to originate from
  5328. client use of the Tor process will be logged unsafely.
  5329. - Time and memory units in the configuration file can now be set to
  5330. fractional units. For example, "2.5 GB" is now a valid value for
  5331. AccountingMax.
  5332. - Support line continuations in the torrc config file. If a line
  5333. ends with a single backslash character, the newline is ignored, and
  5334. the configuration value is treated as continuing on the next line.
  5335. Resolves bug 1929.
  5336. o Minor features (unit tests):
  5337. - Revise our unit tests to use the "tinytest" framework, so we
  5338. can run tests in their own processes, have smarter setup/teardown
  5339. code, and so on. The unit test code has moved to its own
  5340. subdirectory, and has been split into multiple modules.
  5341. - Add a unit test for cross-platform directory-listing code.
  5342. - Add some forgotten return value checks during unit tests. Found
  5343. by coverity.
  5344. - Use GetTempDir to find the proper temporary directory location on
  5345. Windows when generating temporary files for the unit tests. Patch
  5346. by Gisle Vanem.
  5347. o Minor features (misc):
  5348. - The "torify" script now uses torsocks where available.
  5349. - Make Libevent log messages get delivered to controllers later,
  5350. and not from inside the Libevent log handler. This prevents unsafe
  5351. reentrant Libevent calls while still letting the log messages
  5352. get through.
  5353. - Certain Tor clients (such as those behind check.torproject.org) may
  5354. want to fetch the consensus in an extra early manner. To enable this
  5355. a user may now set FetchDirInfoExtraEarly to 1. This also depends on
  5356. setting FetchDirInfoEarly to 1. Previous behavior will stay the same
  5357. as only certain clients who must have this information sooner should
  5358. set this option.
  5359. - Expand homedirs passed to tor-checkkey. This should silence a
  5360. coverity complaint about passing a user-supplied string into
  5361. open() without checking it.
  5362. - Make sure to disable DirPort if running as a bridge. DirPorts aren't
  5363. used on bridges, and it makes bridge scanning somewhat easier.
  5364. - Create the /var/run/tor directory on startup on OpenSUSE if it is
  5365. not already created. Patch from Andreas Stieger. Fixes bug 2573.
  5366. o Minor bugfixes (relays):
  5367. - When a relay decides that its DNS is too broken for it to serve
  5368. as an exit server, it advertised itself as a non-exit, but
  5369. continued to act as an exit. This could create accidental
  5370. partitioning opportunities for users. Instead, if a relay is
  5371. going to advertise reject *:* as its exit policy, it should
  5372. really act with exit policy "reject *:*". Fixes bug 2366.
  5373. Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
  5374. - Publish a router descriptor even if generating an extra-info
  5375. descriptor fails. Previously we would not publish a router
  5376. descriptor without an extra-info descriptor; this can cause fast
  5377. exit relays collecting exit-port statistics to drop from the
  5378. consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
  5379. - When we're trying to guess whether we know our IP address as
  5380. a relay, we would log various ways that we failed to guess
  5381. our address, but never log that we ended up guessing it
  5382. successfully. Now add a log line to help confused and anxious
  5383. relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
  5384. - For bandwidth accounting, calculate our expected bandwidth rate
  5385. based on the time during which we were active and not in
  5386. soft-hibernation during the last interval. Previously, we were
  5387. also considering the time spent in soft-hibernation. If this
  5388. was a long time, we would wind up underestimating our bandwidth
  5389. by a lot, and skewing our wakeup time towards the start of the
  5390. accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
  5391. - Demote a confusing TLS warning that relay operators might get when
  5392. someone tries to talk to their ORPort. It is not the operator's
  5393. fault, nor can they do anything about it. Fixes bug 1364; bugfix
  5394. on 0.2.0.14-alpha.
  5395. - Change "Application request when we're believed to be offline."
  5396. notice to "Application request when we haven't used client
  5397. functionality lately.", to clarify that it's not an error. Bugfix
  5398. on 0.0.9.3; fixes bug 1222.
  5399. o Minor bugfixes (bridges):
  5400. - When a client starts or stops using bridges, never use a circuit
  5401. that was built before the configuration change. This behavior could
  5402. put at risk a user who uses bridges to ensure that her traffic
  5403. only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
  5404. bug 3200.
  5405. - Do not reset the bridge descriptor download status every time we
  5406. re-parse our configuration or get a configuration change. Fixes
  5407. bug 3019; bugfix on 0.2.0.3-alpha.
  5408. - Users couldn't configure a regular relay to be their bridge. It
  5409. didn't work because when Tor fetched the bridge descriptor, it found
  5410. that it already had it, and didn't realize that the purpose of the
  5411. descriptor had changed. Now we replace routers with a purpose other
  5412. than bridge with bridge descriptors when fetching them. Bugfix on
  5413. 0.1.1.9-alpha. Fixes bug 1776.
  5414. - In the special case where you configure a public exit relay as your
  5415. bridge, Tor would be willing to use that exit relay as the last
  5416. hop in your circuit as well. Now we fail that circuit instead.
  5417. Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
  5418. o Minor bugfixes (clients):
  5419. - We now ask the other side of a stream (the client or the exit)
  5420. for more data on that stream when the amount of queued data on
  5421. that stream dips low enough. Previously, we wouldn't ask the
  5422. other side for more data until either it sent us more data (which
  5423. it wasn't supposed to do if it had exhausted its window!) or we
  5424. had completely flushed all our queued data. This flow control fix
  5425. should improve throughput. Fixes bug 2756; bugfix on the earliest
  5426. released versions of Tor (svn commit r152).
  5427. - When a client finds that an origin circuit has run out of 16-bit
  5428. stream IDs, we now mark it as unusable for new streams. Previously,
  5429. we would try to close the entire circuit. Bugfix on 0.0.6.
  5430. - Make it explicit that we don't cannibalize one-hop circuits. This
  5431. happens in the wild, but doesn't turn out to be a problem because
  5432. we fortunately don't use those circuits. Many thanks to outofwords
  5433. for the initial analysis and to swissknife who confirmed that
  5434. two-hop circuits are actually created.
  5435. - Resolve an edge case in path weighting that could make us misweight
  5436. our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
  5437. - Make the DNSPort option work with libevent 2.x. Don't alter the
  5438. behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
  5439. o Minor bugfixes (directory authorities):
  5440. - Make directory authorities more accurate at recording when
  5441. relays that have failed several reachability tests became
  5442. unreachable, so we can provide more accuracy at assigning Stable,
  5443. Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
  5444. - Directory authorities are now more robust to hops back in time
  5445. when calculating router stability. Previously, if a run of uptime
  5446. or downtime appeared to be negative, the calculation could give
  5447. incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
  5448. bug 1035.
  5449. - Directory authorities will now attempt to download consensuses
  5450. if their own efforts to make a live consensus have failed. This
  5451. change means authorities that restart will fetch a valid
  5452. consensus, and it means authorities that didn't agree with the
  5453. current consensus will still fetch and serve it if it has enough
  5454. signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
  5455. - Never vote for a server as "Running" if we have a descriptor for
  5456. it claiming to be hibernating, and that descriptor was published
  5457. more recently than our last contact with the server. Bugfix on
  5458. 0.2.0.3-alpha; fixes bug 911.
  5459. - Directory authorities no longer change their opinion of, or vote on,
  5460. whether a router is Running, unless they have themselves been
  5461. online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
  5462. Fixes bug 1023.
  5463. o Minor bugfixes (hidden services):
  5464. - Log malformed requests for rendezvous descriptors as protocol
  5465. warnings, not warnings. Also, use a more informative log message
  5466. in case someone sees it at log level warning without prior
  5467. info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
  5468. - Accept hidden service descriptors if we think we might be a hidden
  5469. service directory, regardless of what our consensus says. This
  5470. helps robustness, since clients and hidden services can sometimes
  5471. have a more up-to-date view of the network consensus than we do,
  5472. and if they think that the directory authorities list us a HSDir,
  5473. we might actually be one. Related to bug 2732; bugfix on
  5474. 0.2.0.10-alpha.
  5475. - Correct the warning displayed when a rendezvous descriptor exceeds
  5476. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  5477. John Brooks.
  5478. - Clients and hidden services now use HSDir-flagged relays for hidden
  5479. service descriptor downloads and uploads even if the relays have no
  5480. DirPort set and the client has disabled TunnelDirConns. This will
  5481. eventually allow us to give the HSDir flag to relays with no
  5482. DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
  5483. - Only limit the lengths of single HS descriptors, even when multiple
  5484. HS descriptors are published to an HSDir relay in a single POST
  5485. operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
  5486. o Minor bugfixes (controllers):
  5487. - Allow GETINFO fingerprint to return a fingerprint even when
  5488. we have not yet built a router descriptor. Fixes bug 3577;
  5489. bugfix on 0.2.0.1-alpha.
  5490. - Send a SUCCEEDED stream event to the controller when a reverse
  5491. resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
  5492. discovered by katmagic.
  5493. - Remove a trailing asterisk from "exit-policy/default" in the
  5494. output of the control port command "GETINFO info/names". Bugfix
  5495. on 0.1.2.5-alpha.
  5496. - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
  5497. 2917. Bugfix on 0.1.1.1-alpha.
  5498. - When we restart our relay, we might get a successful connection
  5499. from the outside before we've started our reachability tests,
  5500. triggering a warning: "ORPort found reachable, but I have no
  5501. routerinfo yet. Failing to inform controller of success." This
  5502. bug was harmless unless Tor is running under a controller
  5503. like Vidalia, in which case the controller would never get a
  5504. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  5505. fixes bug 1172.
  5506. - When a controller changes TrackHostExits, remove mappings for
  5507. hosts that should no longer have their exits tracked. Bugfix on
  5508. 0.1.0.1-rc.
  5509. - When a controller changes VirtualAddrNetwork, remove any mappings
  5510. for hosts that were automapped to the old network. Bugfix on
  5511. 0.1.1.19-rc.
  5512. - When a controller changes one of the AutomapHosts* options, remove
  5513. any mappings for hosts that should no longer be automapped. Bugfix
  5514. on 0.2.0.1-alpha.
  5515. - Fix an off-by-one error in calculating some controller command
  5516. argument lengths. Fortunately, this mistake is harmless since
  5517. the controller code does redundant NUL termination too. Found by
  5518. boboper. Bugfix on 0.1.1.1-alpha.
  5519. - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
  5520. would return "551 Internal error" rather than "552 Unrecognized key
  5521. ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
  5522. - Don't spam the controller with events when we have no file
  5523. descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
  5524. for log messages was already solved from bug 748.)
  5525. - Emit a GUARD DROPPED controller event for a case we missed.
  5526. - Ensure DNS requests launched by "RESOLVE" commands from the
  5527. controller respect the __LeaveStreamsUnattached setconf options. The
  5528. same goes for requests launched via DNSPort or transparent
  5529. proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
  5530. o Minor bugfixes (config options):
  5531. - Tor used to limit HttpProxyAuthenticator values to 48 characters.
  5532. Change the limit to 512 characters by removing base64 newlines.
  5533. Fixes bug 2752. Fix by Michael Yakubovich.
  5534. - Complain if PublishServerDescriptor is given multiple arguments that
  5535. include 0 or 1. This configuration will be rejected in the future.
  5536. Bugfix on 0.2.0.1-alpha; closes bug 1107.
  5537. - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
  5538. Bugfix on 0.2.0.13-alpha; closes bug 928.
  5539. o Minor bugfixes (log subsystem fixes):
  5540. - When unable to format an address as a string, report its value
  5541. as "???" rather than reusing the last formatted address. Bugfix
  5542. on 0.2.1.5-alpha.
  5543. - Be more consistent in our treatment of file system paths. "~" should
  5544. get expanded to the user's home directory in the Log config option.
  5545. Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
  5546. feature for the -f and --DataDirectory options.
  5547. o Minor bugfixes (memory management):
  5548. - Don't stack-allocate the list of supplementary GIDs when we're
  5549. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  5550. could take up to 256K, which is way too much stack. Found by
  5551. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  5552. - Save a couple bytes in memory allocation every time we escape
  5553. certain characters in a string. Patch from Florian Zumbiehl.
  5554. o Minor bugfixes (protocol correctness):
  5555. - When checking for 1024-bit keys, check for 1024 bits, not 128
  5556. bytes. This allows Tor to correctly discard keys of length 1017
  5557. through 1023. Bugfix on 0.0.9pre5.
  5558. - Require that introduction point keys and onion handshake keys
  5559. have a public exponent of 65537. Starts to fix bug 3207; bugfix
  5560. on 0.2.0.10-alpha.
  5561. - Handle SOCKS messages longer than 128 bytes long correctly, rather
  5562. than waiting forever for them to finish. Fixes bug 2330; bugfix
  5563. on 0.2.0.16-alpha. Found by doorss.
  5564. - Never relay a cell for a circuit we have already destroyed.
  5565. Between marking a circuit as closeable and finally closing it,
  5566. it may have been possible for a few queued cells to get relayed,
  5567. even though they would have been immediately dropped by the next
  5568. OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
  5569. - Never queue a cell for a circuit that's already been marked
  5570. for close.
  5571. - Fix a spec conformance issue: the network-status-version token
  5572. must be the first token in a v3 consensus or vote. Discovered by
  5573. "parakeep". Bugfix on 0.2.0.3-alpha.
  5574. - A networkstatus vote must contain exactly one signature. Spec
  5575. conformance issue. Bugfix on 0.2.0.3-alpha.
  5576. - When asked about a DNS record type we don't support via a
  5577. client DNSPort, reply with NOTIMPL rather than an empty
  5578. reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
  5579. - Make more fields in the controller protocol case-insensitive, since
  5580. control-spec.txt said they were.
  5581. o Minor bugfixes (log messages):
  5582. - Fix a log message that said "bits" while displaying a value in
  5583. bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
  5584. 0.2.0.1-alpha.
  5585. - Downgrade "no current certificates known for authority" message from
  5586. Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
  5587. - Correctly describe errors that occur when generating a TLS object.
  5588. Previously we would attribute them to a failure while generating a
  5589. TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
  5590. bug 1994.
  5591. - Fix an instance where a Tor directory mirror might accidentally
  5592. log the IP address of a misbehaving Tor client. Bugfix on
  5593. 0.1.0.1-rc.
  5594. - Stop logging at severity 'warn' when some other Tor client tries
  5595. to establish a circuit with us using weak DH keys. It's a protocol
  5596. violation, but that doesn't mean ordinary users need to hear about
  5597. it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
  5598. - If your relay can't keep up with the number of incoming create
  5599. cells, it would log one warning per failure into your logs. Limit
  5600. warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
  5601. o Minor bugfixes (build fixes):
  5602. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  5603. - When warning about missing zlib development packages during compile,
  5604. give the correct package names. Bugfix on 0.2.0.1-alpha.
  5605. - Fix warnings that newer versions of autoconf produce during
  5606. ./autogen.sh. These warnings appear to be harmless in our case,
  5607. but they were extremely verbose. Fixes bug 2020.
  5608. - Squash a compile warning on OpenBSD. Reported by Tas; fixes
  5609. bug 1848.
  5610. o Minor bugfixes (portability):
  5611. - Write several files in text mode, on OSes that distinguish text
  5612. mode from binary mode (namely, Windows). These files are:
  5613. 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
  5614. that collect those statistics; 'client_keys' and 'hostname' for
  5615. hidden services that use authentication; and (in the tor-gencert
  5616. utility) newly generated identity and signing keys. Previously,
  5617. we wouldn't specify text mode or binary mode, leading to an
  5618. assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
  5619. the DirRecordUsageByCountry option which would have triggered
  5620. the assertion failure was added), although this assertion failure
  5621. would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
  5622. - Selectively disable deprecation warnings on OS X because Lion
  5623. started deprecating the shipped copy of openssl. Fixes bug 3643.
  5624. - Use a wide type to hold sockets when built for 64-bit Windows.
  5625. Fixes bug 3270.
  5626. - Fix an issue that prevented static linking of libevent on
  5627. some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
  5628. where we introduced the "--with-static-libevent" configure option.
  5629. - Fix a bug with our locking implementation on Windows that couldn't
  5630. correctly detect when a file was already locked. Fixes bug 2504,
  5631. bugfix on 0.2.1.6-alpha.
  5632. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  5633. enabled.
  5634. - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
  5635. Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
  5636. "piebeer".
  5637. o Minor bugfixes (code correctness):
  5638. - Always NUL-terminate the sun_path field of a sockaddr_un before
  5639. passing it to the kernel. (Not a security issue: kernels are
  5640. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  5641. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  5642. - Make connection_printf_to_buf()'s behavior sane. Its callers
  5643. expect it to emit a CRLF iff the format string ends with CRLF;
  5644. it actually emitted a CRLF iff (a) the format string ended with
  5645. CRLF or (b) the resulting string was over 1023 characters long or
  5646. (c) the format string did not end with CRLF *and* the resulting
  5647. string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
  5648. fixes part of bug 3407.
  5649. - Make send_control_event_impl()'s behavior sane. Its callers
  5650. expect it to always emit a CRLF at the end of the string; it
  5651. might have emitted extra control characters as well. Bugfix on
  5652. 0.1.1.9-alpha; fixes another part of bug 3407.
  5653. - Make crypto_rand_int() check the value of its input correctly.
  5654. Previously, it accepted values up to UINT_MAX, but could return a
  5655. negative number if given a value above INT_MAX+1. Found by George
  5656. Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
  5657. - Fix a potential null-pointer dereference while computing a
  5658. consensus. Bugfix on tor-0.2.0.3-alpha, found with the help of
  5659. clang's analyzer.
  5660. - If we fail to compute the identity digest of a v3 legacy keypair,
  5661. warn, and don't use a buffer-full of junk instead. Bugfix on
  5662. 0.2.1.1-alpha; fixes bug 3106.
  5663. - Resolve an untriggerable issue in smartlist_string_num_isin(),
  5664. where if the function had ever in the future been used to check
  5665. for the presence of a too-large number, it would have given an
  5666. incorrect result. (Fortunately, we only used it for 16-bit
  5667. values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
  5668. - Be more careful about reporting the correct error from a failed
  5669. connect() system call. Under some circumstances, it was possible to
  5670. look at an incorrect value for errno when sending the end reason.
  5671. Bugfix on 0.1.0.1-rc.
  5672. - Correctly handle an "impossible" overflow cases in connection byte
  5673. counting, where we write or read more than 4GB on an edge connection
  5674. in a single second. Bugfix on 0.1.2.8-beta.
  5675. - Avoid a double mark-for-free warning when failing to attach a
  5676. transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
  5677. bug 2279.
  5678. - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
  5679. found by "cypherpunks". This bug was introduced before the first
  5680. Tor release, in svn commit r110.
  5681. - Fix a bug in bandwidth history state parsing that could have been
  5682. triggered if a future version of Tor ever changed the timing
  5683. granularity at which bandwidth history is measured. Bugfix on
  5684. Tor 0.1.1.11-alpha.
  5685. - Add assertions to check for overflow in arguments to
  5686. base32_encode() and base32_decode(); fix a signed-unsigned
  5687. comparison there too. These bugs are not actually reachable in Tor,
  5688. but it's good to prevent future errors too. Found by doorss.
  5689. - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
  5690. "memcpyfail".
  5691. - Set target port in get_interface_address6() correctly. Bugfix
  5692. on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
  5693. - Fix an impossible-to-actually-trigger buffer overflow in relay
  5694. descriptor generation. Bugfix on 0.1.0.15.
  5695. - Fix numerous small code-flaws found by Coverity Scan Rung 3.
  5696. o Minor bugfixes (code improvements):
  5697. - After we free an internal connection structure, overwrite it
  5698. with a different memory value than we use for overwriting a freed
  5699. internal circuit structure. Should help with debugging. Suggested
  5700. by bug 1055.
  5701. - If OpenSSL fails to make a duplicate of a private or public key, log
  5702. an error message and try to exit cleanly. May help with debugging
  5703. if bug 1209 ever remanifests.
  5704. - Some options used different conventions for uppercasing of acronyms
  5705. when comparing manpage and source. Fix those in favor of the
  5706. manpage, as it makes sense to capitalize acronyms.
  5707. - Take a first step towards making or.h smaller by splitting out
  5708. function definitions for all source files in src/or/. Leave
  5709. structures and defines in or.h for now.
  5710. - Remove a few dead assignments during router parsing. Found by
  5711. coverity.
  5712. - Don't use 1-bit wide signed bit fields. Found by coverity.
  5713. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  5714. None of the cases where we did this before were wrong, but by making
  5715. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  5716. - The memarea code now uses a sentinel value at the end of each area
  5717. to make sure nothing writes beyond the end of an area. This might
  5718. help debug some conceivable causes of bug 930.
  5719. - Always treat failure to allocate an RSA key as an unrecoverable
  5720. allocation error.
  5721. - Add some more defensive programming for architectures that can't
  5722. handle unaligned integer accesses. We don't know of any actual bugs
  5723. right now, but that's the best time to fix them. Fixes bug 1943.
  5724. o Minor bugfixes (misc):
  5725. - Fix a rare bug in rend_fn unit tests: we would fail a test when
  5726. a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
  5727. on 0.2.0.10-alpha; fixes bug 1808.
  5728. - Where available, use Libevent 2.0's periodic timers so that our
  5729. once-per-second cleanup code gets called even more closely to
  5730. once per second than it would otherwise. Fixes bug 943.
  5731. - Ignore OutboundBindAddress when connecting to localhost.
  5732. Connections to localhost need to come _from_ localhost, or else
  5733. local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
  5734. refuse to listen.
  5735. - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
  5736. too.
  5737. - If any of the v3 certs we download are unparseable, we should
  5738. actually notice the failure so we don't retry indefinitely. Bugfix
  5739. on 0.2.0.x; reported by "rotator".
  5740. - When Tor fails to parse a descriptor of any kind, dump it to disk.
  5741. Might help diagnosing bug 1051.
  5742. - Make our 'torify' script more portable; if we have only one of
  5743. 'torsocks' or 'tsocks' installed, don't complain to the user;
  5744. and explain our warning about tsocks better.
  5745. - Fix some urls in the exit notice file and make it XHTML1.1 strict
  5746. compliant. Based on a patch from Christian Kujau.
  5747. o Documentation changes:
  5748. - Modernize the doxygen configuration file slightly. Fixes bug 2707.
  5749. - Resolve all doxygen warnings except those for missing documentation.
  5750. Fixes bug 2705.
  5751. - Add doxygen documentation for more functions, fields, and types.
  5752. - Convert the HACKING file to asciidoc, and add a few new sections
  5753. to it, explaining how we use Git, how we make changelogs, and
  5754. what should go in a patch.
  5755. - Document the default socks host and port (127.0.0.1:9050) for
  5756. tor-resolve.
  5757. - Removed some unnecessary files from the source distribution. The
  5758. AUTHORS file has now been merged into the people page on the
  5759. website. The roadmaps and design doc can now be found in the
  5760. projects directory in svn.
  5761. o Deprecated and removed features (config):
  5762. - Remove the torrc.complete file. It hasn't been kept up to date
  5763. and users will have better luck checking out the manpage.
  5764. - Remove the HSAuthorityRecordStats option that version 0 hidden
  5765. service authorities could use to track statistics of overall v0
  5766. hidden service usage.
  5767. - Remove the obsolete "NoPublish" option; it has been flagged
  5768. as obsolete and has produced a warning since 0.1.1.18-rc.
  5769. - Caches no longer download and serve v2 networkstatus documents
  5770. unless FetchV2Networkstatus flag is set: these documents haven't
  5771. haven't been used by clients or relays since 0.2.0.x. Resolves
  5772. bug 3022.
  5773. o Deprecated and removed features (controller):
  5774. - The controller no longer accepts the old obsolete "addr-mappings/"
  5775. or "unregistered-servers-" GETINFO values.
  5776. - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
  5777. always on; using them is necessary for correct forward-compatible
  5778. controllers.
  5779. o Deprecated and removed features (misc):
  5780. - Hidden services no longer publish version 0 descriptors, and clients
  5781. do not request or use version 0 descriptors. However, the old hidden
  5782. service authorities still accept and serve version 0 descriptors
  5783. when contacted by older hidden services/clients.
  5784. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  5785. anything since 0.2.1.16-rc.
  5786. - Remove everything related to building the expert bundle for OS X.
  5787. It has confused many users, doesn't work right on OS X 10.6,
  5788. and is hard to get rid of once installed. Resolves bug 1274.
  5789. - Remove support for .noconnect style addresses. Nobody was using
  5790. them, and they provided another avenue for detecting Tor users
  5791. via application-level web tricks.
  5792. - When we fixed bug 1038 we had to put in a restriction not to send
  5793. RELAY_EARLY cells on rend circuits. This was necessary as long
  5794. as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
  5795. active. Now remove this obsolete check. Resolves bug 2081.
  5796. - Remove workaround code to handle directory responses from servers
  5797. that had bug 539 (they would send HTTP status 503 responses _and_
  5798. send a body too). Since only server versions before
  5799. 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
  5800. keep the workaround in place.
  5801. - Remove the old 'fuzzy time' logic. It was supposed to be used for
  5802. handling calculations where we have a known amount of clock skew and
  5803. an allowed amount of unknown skew. But we only used it in three
  5804. places, and we never adjusted the known/unknown skew values. This is
  5805. still something we might want to do someday, but if we do, we'll
  5806. want to do it differently.
  5807. - Remove the "--enable-iphone" option to ./configure. According to
  5808. reports from Marco Bonetti, Tor builds fine without any special
  5809. tweaking on recent iPhone SDK versions.
  5810. Changes in version 0.2.1.30 - 2011-02-23
  5811. Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
  5812. change is a slight tweak to Tor's TLS handshake that makes relays
  5813. and bridges that run this new version reachable from Iran again.
  5814. We don't expect this tweak will win the arms race long-term, but it
  5815. buys us time until we roll out a better solution.
  5816. o Major bugfixes:
  5817. - Stop sending a CLOCK_SKEW controller status event whenever
  5818. we fetch directory information from a relay that has a wrong clock.
  5819. Instead, only inform the controller when it's a trusted authority
  5820. that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
  5821. the rest of bug 1074.
  5822. - Fix a bounds-checking error that could allow an attacker to
  5823. remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
  5824. Found by "piebeer".
  5825. - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
  5826. Tor would ignore their RelayBandwidthBurst setting,
  5827. potentially using more bandwidth than expected. Bugfix on
  5828. 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
  5829. - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
  5830. hidserv" in her torrc. The 'hidserv' argument never controlled
  5831. publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
  5832. o Minor features:
  5833. - Adjust our TLS Diffie-Hellman parameters to match those used by
  5834. Apache's mod_ssl.
  5835. - Update to the February 1 2011 Maxmind GeoLite Country database.
  5836. o Minor bugfixes:
  5837. - Check for and reject overly long directory certificates and
  5838. directory tokens before they have a chance to hit any assertions.
  5839. Bugfix on 0.2.1.28. Found by "doorss".
  5840. - Bring the logic that gathers routerinfos and assesses the
  5841. acceptability of circuits into line. This prevents a Tor OP from
  5842. getting locked in a cycle of choosing its local OR as an exit for a
  5843. path (due to a .exit request) and then rejecting the circuit because
  5844. its OR is not listed yet. It also prevents Tor clients from using an
  5845. OR running in the same instance as an exit (due to a .exit request)
  5846. if the OR does not meet the same requirements expected of an OR
  5847. running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
  5848. o Packaging changes:
  5849. - Stop shipping the Tor specs files and development proposal documents
  5850. in the tarball. They are now in a separate git repository at
  5851. git://git.torproject.org/torspec.git
  5852. - Do not include Git version tags as though they are SVN tags when
  5853. generating a tarball from inside a repository that has switched
  5854. between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  5855. Changes in version 0.2.1.29 - 2011-01-15
  5856. Tor 0.2.1.29 continues our recent code security audit work. The main
  5857. fix resolves a remote heap overflow vulnerability that can allow remote
  5858. code execution. Other fixes address a variety of assert and crash bugs,
  5859. most of which we think are hard to exploit remotely.
  5860. o Major bugfixes (security):
  5861. - Fix a heap overflow bug where an adversary could cause heap
  5862. corruption. This bug probably allows remote code execution
  5863. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  5864. 0.1.2.10-rc.
  5865. - Prevent a denial-of-service attack by disallowing any
  5866. zlib-compressed data whose compression factor is implausibly
  5867. high. Fixes part of bug 2324; reported by "doorss".
  5868. - Zero out a few more keys in memory before freeing them. Fixes
  5869. bug 2384 and part of bug 2385. These key instances found by
  5870. "cypherpunks", based on Andrew Case's report about being able
  5871. to find sensitive data in Tor's memory space if you have enough
  5872. permissions. Bugfix on 0.0.2pre9.
  5873. o Major bugfixes (crashes):
  5874. - Prevent calls to Libevent from inside Libevent log handlers.
  5875. This had potential to cause a nasty set of crashes, especially
  5876. if running Libevent with debug logging enabled, and running
  5877. Tor with a controller watching for low-severity log messages.
  5878. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  5879. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  5880. underflow errors there too. Fixes the other part of bug 2324.
  5881. - Fix a bug where we would assert if we ever had a
  5882. cached-descriptors.new file (or another file read directly into
  5883. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  5884. on 0.2.1.25. Found by doorss.
  5885. - Fix some potential asserts and parsing issues with grossly
  5886. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  5887. Found by doorss.
  5888. o Minor bugfixes (other):
  5889. - Fix a bug with handling misformed replies to reverse DNS lookup
  5890. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  5891. bug reported by doorss.
  5892. - Fix compilation on mingw when a pthreads compatibility library
  5893. has been installed. (We don't want to use it, so we shouldn't
  5894. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  5895. - Fix a bug where we would declare that we had run out of virtual
  5896. addresses when the address space was only half-exhausted. Bugfix
  5897. on 0.1.2.1-alpha.
  5898. - Correctly handle the case where AutomapHostsOnResolve is set but
  5899. no virtual addresses are available. Fixes bug 2328; bugfix on
  5900. 0.1.2.1-alpha. Bug found by doorss.
  5901. - Correctly handle wrapping around when we run out of virtual
  5902. address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
  5903. o Minor features:
  5904. - Update to the January 1 2011 Maxmind GeoLite Country database.
  5905. - Introduce output size checks on all of our decryption functions.
  5906. o Build changes:
  5907. - Tor does not build packages correctly with Automake 1.6 and earlier;
  5908. added a check to Makefile.am to make sure that we're building with
  5909. Automake 1.7 or later.
  5910. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  5911. because we built it with a too-old version of automake. Thus that
  5912. release broke ./configure --enable-openbsd-malloc, which is popular
  5913. among really fast exit relays on Linux.
  5914. Changes in version 0.2.1.28 - 2010-12-17
  5915. Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
  5916. exploitable bugs. We also took this opportunity to change the IP address
  5917. for one of our directory authorities, and to update the geoip database
  5918. we ship.
  5919. o Major bugfixes:
  5920. - Fix a remotely exploitable bug that could be used to crash instances
  5921. of Tor remotely by overflowing on the heap. Remote-code execution
  5922. hasn't been confirmed, but can't be ruled out. Everyone should
  5923. upgrade. Bugfix on the 0.1.1 series and later.
  5924. o Directory authority changes:
  5925. - Change IP address and ports for gabelmoo (v3 directory authority).
  5926. o Minor features:
  5927. - Update to the December 1 2010 Maxmind GeoLite Country database.
  5928. Changes in version 0.2.1.27 - 2010-11-23
  5929. Yet another OpenSSL security patch broke its compatibility with Tor:
  5930. Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
  5931. also took this opportunity to fix several crash bugs, integrate a new
  5932. directory authority, and update the bundled GeoIP database.
  5933. o Major bugfixes:
  5934. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  5935. No longer set the tlsext_host_name extension on server SSL objects;
  5936. but continue to set it on client SSL objects. Our goal in setting
  5937. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  5938. bugfix on 0.2.1.1-alpha.
  5939. - Do not log messages to the controller while shrinking buffer
  5940. freelists. Doing so would sometimes make the controller connection
  5941. try to allocate a buffer chunk, which would mess up the internals
  5942. of the freelist and cause an assertion failure. Fixes bug 1125;
  5943. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  5944. - Learn our external IP address when we're a relay or bridge, even if
  5945. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  5946. where we introduced bridge relays that don't need to publish to
  5947. be useful. Fixes bug 2050.
  5948. - Do even more to reject (and not just ignore) annotations on
  5949. router descriptors received anywhere but from the cache. Previously
  5950. we would ignore such annotations at first, but cache them to disk
  5951. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  5952. - When you're using bridges and your network goes away and your
  5953. bridges get marked as down, recover when you attempt a new socks
  5954. connection (if the network is back), rather than waiting up to an
  5955. hour to try fetching new descriptors for your bridges. Bugfix on
  5956. 0.2.0.3-alpha; fixes bug 1981.
  5957. o Major features:
  5958. - Move to the November 2010 Maxmind GeoLite country db (rather
  5959. than the June 2009 ip-to-country GeoIP db) for our statistics that
  5960. count how many users relays are seeing from each country. Now we'll
  5961. have more accurate data, especially for many African countries.
  5962. o New directory authorities:
  5963. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  5964. authority.
  5965. o Minor bugfixes:
  5966. - Fix an assertion failure that could occur in directory caches or
  5967. bridge users when using a very short voting interval on a testing
  5968. network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
  5969. 0.2.0.8-alpha.
  5970. - Enforce multiplicity rules when parsing annotations. Bugfix on
  5971. 0.2.0.8-alpha. Found by piebeer.
  5972. - Allow handshaking OR connections to take a full KeepalivePeriod
  5973. seconds to handshake. Previously, we would close them after
  5974. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  5975. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  5976. for analysis help.
  5977. - When building with --enable-gcc-warnings on OpenBSD, disable
  5978. warnings in system headers. This makes --enable-gcc-warnings
  5979. pass on OpenBSD 4.8.
  5980. o Minor features:
  5981. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  5982. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  5983. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  5984. Servers can start sending this code when enough clients recognize
  5985. it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
  5986. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  5987. Patch from mingw-san.
  5988. o Removed files:
  5989. - Remove the old debian/ directory from the main Tor distribution.
  5990. The official Tor-for-debian git repository lives at the URL
  5991. https://git.torproject.org/debian/tor.git
  5992. - Stop shipping the old doc/website/ directory in the tarball. We
  5993. changed the website format in late 2010, and what we shipped in
  5994. 0.2.1.26 really wasn't that useful anyway.
  5995. Changes in version 0.2.1.26 - 2010-05-02
  5996. Tor 0.2.1.26 addresses the recent connection and memory overload
  5997. problems we've been seeing on relays, especially relays with their
  5998. DirPort open. If your relay has been crashing, or you turned it off
  5999. because it used too many resources, give this release a try.
  6000. This release also fixes yet another instance of broken OpenSSL libraries
  6001. that was causing some relays to drop out of the consensus.
  6002. o Major bugfixes:
  6003. - Teach relays to defend themselves from connection overload. Relays
  6004. now close idle circuits early if it looks like they were intended
  6005. for directory fetches. Relays are also more aggressive about closing
  6006. TLS connections that have no circuits on them. Such circuits are
  6007. unlikely to be re-used, and tens of thousands of them were piling
  6008. up at the fast relays, causing the relays to run out of sockets
  6009. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  6010. their directory fetches over TLS).
  6011. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  6012. that claim to be earlier than 0.9.8m, but which have in reality
  6013. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  6014. behavior. Possible fix for some cases of bug 1346.
  6015. - Directory mirrors were fetching relay descriptors only from v2
  6016. directory authorities, rather than v3 authorities like they should.
  6017. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  6018. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  6019. o Minor bugfixes:
  6020. - Finally get rid of the deprecated and now harmful notion of "clique
  6021. mode", where directory authorities maintain TLS connections to
  6022. every other relay.
  6023. o Testsuite fixes:
  6024. - In the util/threads test, no longer free the test_mutex before all
  6025. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  6026. - The master thread could starve the worker threads quite badly on
  6027. certain systems, causing them to run only partially in the allowed
  6028. window. This resulted in test failures. Now the master thread sleeps
  6029. occasionally for a few microseconds while the two worker-threads
  6030. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  6031. Changes in version 0.2.1.25 - 2010-03-16
  6032. Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  6033. prevent relays from guessing their IP address correctly. It also fixes
  6034. several minor potential security bugs.
  6035. o Major bugfixes:
  6036. - Fix a regression from our patch for bug 1244 that caused relays
  6037. to guess their IP address incorrectly if they didn't set Address
  6038. in their torrc and/or their address fails to resolve. Bugfix on
  6039. 0.2.1.23; fixes bug 1269.
  6040. - When freeing a session key, zero it out completely. We only zeroed
  6041. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  6042. patched by ekir. Fixes bug 1254.
  6043. o Minor bugfixes:
  6044. - Fix a dereference-then-NULL-check sequence when publishing
  6045. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  6046. bug 1255.
  6047. - Fix another dereference-then-NULL-check sequence. Bugfix on
  6048. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  6049. - Make sure we treat potentially not NUL-terminated strings correctly.
  6050. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  6051. Changes in version 0.2.1.24 - 2010-02-21
  6052. Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  6053. for sure!
  6054. o Minor bugfixes:
  6055. - Work correctly out-of-the-box with even more vendor-patched versions
  6056. of OpenSSL. In particular, make it so Debian and OS X don't need
  6057. customized patches to run/build.
  6058. Changes in version 0.2.1.23 - 2010-02-13
  6059. Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  6060. again on the latest OS X, and updates the location of a directory
  6061. authority.
  6062. o Major bugfixes (performance):
  6063. - We were selecting our guards uniformly at random, and then weighting
  6064. which of our guards we'd use uniformly at random. This imbalance
  6065. meant that Tor clients were severely limited on throughput (and
  6066. probably latency too) by the first hop in their circuit. Now we
  6067. select guards weighted by currently advertised bandwidth. We also
  6068. automatically discard guards picked using the old algorithm. Fixes
  6069. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  6070. o Major bugfixes:
  6071. - Make Tor work again on the latest OS X: when deciding whether to
  6072. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  6073. version at run-time, not compile time. We need to do this because
  6074. Apple doesn't update its dev-tools headers when it updates its
  6075. libraries in a security patch.
  6076. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  6077. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  6078. a memory leak when requesting a hidden service descriptor we've
  6079. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  6080. by aakova.
  6081. o Minor bugfixes:
  6082. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  6083. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  6084. o Minor features:
  6085. - Avoid a mad rush at the beginning of each month when each client
  6086. rotates half of its guards. Instead we spread the rotation out
  6087. throughout the month, but we still avoid leaving a precise timestamp
  6088. in the state file about when we first picked the guard. Improves
  6089. over the behavior introduced in 0.1.2.17.
  6090. Changes in version 0.2.1.22 - 2010-01-19
  6091. Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  6092. authorities -- it would tell you its whole history of bridge descriptors
  6093. if you make the right directory request. This stable update also
  6094. rotates two of the seven v3 directory authority keys and locations.
  6095. o Directory authority changes:
  6096. - Rotate keys (both v3 identity and relay identity) for moria1
  6097. and gabelmoo.
  6098. o Major bugfixes:
  6099. - Stop bridge directory authorities from answering dbg-stability.txt
  6100. directory queries, which would let people fetch a list of all
  6101. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  6102. Changes in version 0.2.1.21 - 2009-12-21
  6103. Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  6104. library. If you use Tor on Linux / Unix and you're getting SSL
  6105. renegotiation errors, upgrading should help. We also recommend an
  6106. upgrade if you're an exit relay.
  6107. o Major bugfixes:
  6108. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  6109. handshake from working unless we explicitly tell OpenSSL that we
  6110. are using SSL renegotiation safely. We are, of course, but OpenSSL
  6111. 0.9.8l won't work unless we say we are.
  6112. - Avoid crashing if the client is trying to upload many bytes and the
  6113. circuit gets torn down at the same time, or if the flip side
  6114. happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
  6115. o Minor bugfixes:
  6116. - Do not refuse to learn about authority certs and v2 networkstatus
  6117. documents that are older than the latest consensus. This bug might
  6118. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  6119. Spotted and fixed by xmux.
  6120. - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
  6121. trigger platform-specific option misparsing case found by Coverity
  6122. Scan.
  6123. - Fix a compilation warning on Fedora 12 by removing an impossible-to-
  6124. trigger assert. Fixes bug 1173.
  6125. Changes in version 0.2.1.20 - 2009-10-15
  6126. Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  6127. services at once, prepares for more performance improvements, and
  6128. fixes a bunch of smaller bugs.
  6129. The Windows and OS X bundles also include a more recent Vidalia,
  6130. and switch from Privoxy to Polipo.
  6131. The OS X installers are now drag and drop. It's best to un-install
  6132. Tor/Vidalia and then install this new bundle, rather than upgrade. If
  6133. you want to upgrade, you'll need to update the paths for Tor and Polipo
  6134. in the Vidalia Settings window.
  6135. o Major bugfixes:
  6136. - Send circuit or stream sendme cells when our window has decreased
  6137. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  6138. by Karsten when testing the "reduce circuit window" performance
  6139. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  6140. before the release of Tor 0.0.0. This is the new winner of the
  6141. oldest-bug prize.
  6142. - Fix a remotely triggerable memory leak when a consensus document
  6143. contains more than one signature from the same voter. Bugfix on
  6144. 0.2.0.3-alpha.
  6145. - Avoid segfault in rare cases when finishing an introduction circuit
  6146. as a client and finding out that we don't have an introduction key
  6147. for it. Fixes bug 1073. Reported by Aaron Swartz.
  6148. o Major features:
  6149. - Tor now reads the "circwindow" parameter out of the consensus,
  6150. and uses that value for its circuit package window rather than the
  6151. default of 1000 cells. Begins the implementation of proposal 168.
  6152. o New directory authorities:
  6153. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  6154. authority.
  6155. - Move moria1 and tonga to alternate IP addresses.
  6156. o Minor bugfixes:
  6157. - Fix a signed/unsigned compile warning in 0.2.1.19.
  6158. - Fix possible segmentation fault on directory authorities. Bugfix on
  6159. 0.2.1.14-rc.
  6160. - Fix an extremely rare infinite recursion bug that could occur if
  6161. we tried to log a message after shutting down the log subsystem.
  6162. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  6163. - Fix an obscure bug where hidden services on 64-bit big-endian
  6164. systems might mis-read the timestamp in v3 introduce cells, and
  6165. refuse to connect back to the client. Discovered by "rotor".
  6166. Bugfix on 0.2.1.6-alpha.
  6167. - We were triggering a CLOCK_SKEW controller status event whenever
  6168. we connect via the v2 connection protocol to any relay that has
  6169. a wrong clock. Instead, we should only inform the controller when
  6170. it's a trusted authority that claims our clock is wrong. Bugfix
  6171. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  6172. - We were telling the controller about CHECKING_REACHABILITY and
  6173. REACHABILITY_FAILED status events whenever we launch a testing
  6174. circuit or notice that one has failed. Instead, only tell the
  6175. controller when we want to inform the user of overall success or
  6176. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  6177. by SwissTorExit.
  6178. - Don't warn when we're using a circuit that ends with a node
  6179. excluded in ExcludeExitNodes, but the circuit is not used to access
  6180. the outside world. This should help fix bug 1090. Bugfix on
  6181. 0.2.1.6-alpha.
  6182. - Work around a small memory leak in some versions of OpenSSL that
  6183. stopped the memory used by the hostname TLS extension from being
  6184. freed.
  6185. o Minor features:
  6186. - Add a "getinfo status/accepted-server-descriptor" controller
  6187. command, which is the recommended way for controllers to learn
  6188. whether our server descriptor has been successfully received by at
  6189. least on directory authority. Un-recommend good-server-descriptor
  6190. getinfo and status events until we have a better design for them.
  6191. Changes in version 0.2.1.19 - 2009-07-28
  6192. Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  6193. services.
  6194. o Major bugfixes:
  6195. - Make accessing hidden services on 0.2.1.x work right again.
  6196. Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
  6197. part of patch provided by "optimist".
  6198. o Minor features:
  6199. - When a relay/bridge is writing out its identity key fingerprint to
  6200. the "fingerprint" file and to its logs, write it without spaces. Now
  6201. it will look like the fingerprints in our bridges documentation,
  6202. and confuse fewer users.
  6203. o Minor bugfixes:
  6204. - Relays no longer publish a new server descriptor if they change
  6205. their MaxAdvertisedBandwidth config option but it doesn't end up
  6206. changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
  6207. fixes bug 1026. Patch from Sebastian.
  6208. - Avoid leaking memory every time we get a create cell but we have
  6209. so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
  6210. fixes bug 1034. Reported by BarkerJr.
  6211. Changes in version 0.2.1.18 - 2009-07-24
  6212. Tor 0.2.1.18 lays the foundations for performance improvements,
  6213. adds status events to help users diagnose bootstrap problems, adds
  6214. optional authentication/authorization for hidden services, fixes a
  6215. variety of potential anonymity problems, and includes a huge pile of
  6216. other features and bug fixes.
  6217. o Major features (clients):
  6218. - Start sending "bootstrap phase" status events to the controller,
  6219. so it can keep the user informed of progress fetching directory
  6220. information and establishing circuits. Also inform the controller
  6221. if we think we're stuck at a particular bootstrap phase. Implements
  6222. proposal 137.
  6223. - Clients replace entry guards that were chosen more than a few months
  6224. ago. This change should significantly improve client performance,
  6225. especially once more people upgrade, since relays that have been
  6226. a guard for a long time are currently overloaded.
  6227. - Network status consensus documents and votes now contain bandwidth
  6228. information for each relay. Clients use the bandwidth values
  6229. in the consensus, rather than the bandwidth values in each
  6230. relay descriptor. This approach opens the door to more accurate
  6231. bandwidth estimates once the directory authorities start doing
  6232. active measurements. Implements part of proposal 141.
  6233. o Major features (relays):
  6234. - Disable and refactor some debugging checks that forced a linear scan
  6235. over the whole server-side DNS cache. These accounted for over 50%
  6236. of CPU time on a relatively busy exit node's gprof profile. Also,
  6237. disable some debugging checks that appeared in exit node profile
  6238. data. Found by Jacob.
  6239. - New DirPortFrontPage option that takes an html file and publishes
  6240. it as "/" on the DirPort. Now relay operators can provide a
  6241. disclaimer without needing to set up a separate webserver. There's
  6242. a sample disclaimer in contrib/tor-exit-notice.html.
  6243. o Major features (hidden services):
  6244. - Make it possible to build hidden services that only certain clients
  6245. are allowed to connect to. This is enforced at several points,
  6246. so that unauthorized clients are unable to send INTRODUCE cells
  6247. to the service, or even (depending on the type of authentication)
  6248. to learn introduction points. This feature raises the bar for
  6249. certain kinds of active attacks against hidden services. Design
  6250. and code by Karsten Loesing. Implements proposal 121.
  6251. - Relays now store and serve v2 hidden service descriptors by default,
  6252. i.e., the new default value for HidServDirectoryV2 is 1. This is
  6253. the last step in proposal 114, which aims to make hidden service
  6254. lookups more reliable.
  6255. o Major features (path selection):
  6256. - ExitNodes and Exclude*Nodes config options now allow you to restrict
  6257. by country code ("{US}") or IP address or address pattern
  6258. ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
  6259. refinement to decide what config options should take priority if
  6260. you ask to both use a particular node and exclude it.
  6261. o Major features (misc):
  6262. - When building a consensus, do not include routers that are down.
  6263. This cuts down 30% to 40% on consensus size. Implements proposal
  6264. 138.
  6265. - New TestingTorNetwork config option to allow adjustment of
  6266. previously constant values that could slow bootstrapping. Implements
  6267. proposal 135. Patch from Karsten.
  6268. - Convert many internal address representations to optionally hold
  6269. IPv6 addresses. Generate and accept IPv6 addresses in many protocol
  6270. elements. Make resolver code handle nameservers located at IPv6
  6271. addresses.
  6272. - More work on making our TLS handshake blend in: modify the list
  6273. of ciphers advertised by OpenSSL in client mode to even more
  6274. closely resemble a common web browser. We cheat a little so that
  6275. we can advertise ciphers that the locally installed OpenSSL doesn't
  6276. know about.
  6277. - Use the TLS1 hostname extension to more closely resemble browser
  6278. behavior.
  6279. o Security fixes (anonymity/entropy):
  6280. - Never use a connection with a mismatched address to extend a
  6281. circuit, unless that connection is canonical. A canonical
  6282. connection is one whose address is authenticated by the router's
  6283. identity key, either in a NETINFO cell or in a router descriptor.
  6284. - Implement most of proposal 110: The first K cells to be sent
  6285. along a circuit are marked as special "early" cells; only K "early"
  6286. cells will be allowed. Once this code is universal, we can block
  6287. certain kinds of denial-of-service attack by requiring that EXTEND
  6288. commands must be sent using an "early" cell.
  6289. - Resume using OpenSSL's RAND_poll() for better (and more portable)
  6290. cross-platform entropy collection again. We used to use it, then
  6291. stopped using it because of a bug that could crash systems that
  6292. called RAND_poll when they had a lot of fds open. It looks like the
  6293. bug got fixed in late 2006. Our new behavior is to call RAND_poll()
  6294. at startup, and to call RAND_poll() when we reseed later only if
  6295. we have a non-buggy OpenSSL version.
  6296. - When the client is choosing entry guards, now it selects at most
  6297. one guard from a given relay family. Otherwise we could end up with
  6298. all of our entry points into the network run by the same operator.
  6299. Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
  6300. - Do not use or believe expired v3 authority certificates. Patch
  6301. from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
  6302. - Drop begin cells to a hidden service if they come from the middle
  6303. of a circuit. Patch from lark.
  6304. - When we erroneously receive two EXTEND cells for the same circuit
  6305. ID on the same connection, drop the second. Patch from lark.
  6306. - Authorities now vote for the Stable flag for any router whose
  6307. weighted MTBF is at least 5 days, regardless of the mean MTBF.
  6308. - Clients now never report any stream end reason except 'MISC'.
  6309. Implements proposal 148.
  6310. o Major bugfixes (crashes):
  6311. - Parse dates and IPv4 addresses in a locale- and libc-independent
  6312. manner, to avoid platform-dependent behavior on malformed input.
  6313. - Fix a crash that occurs on exit nodes when a nameserver request
  6314. timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
  6315. been suppressing the bug since 0.1.2.10-alpha. Partial fix for
  6316. bug 929.
  6317. - Do not assume that a stack-allocated character array will be
  6318. 64-bit aligned on platforms that demand that uint64_t access is
  6319. aligned. Possible fix for bug 604.
  6320. - Resolve a very rare crash bug that could occur when the user forced
  6321. a nameserver reconfiguration during the middle of a nameserver
  6322. probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
  6323. - Avoid a "0 divided by 0" calculation when calculating router uptime
  6324. at directory authorities. Bugfix on 0.2.0.8-alpha.
  6325. - Fix an assertion bug in parsing policy-related options; possible fix
  6326. for bug 811.
  6327. - Rate-limit too-many-sockets messages: when they happen, they happen
  6328. a lot and end up filling up the disk. Resolves bug 748.
  6329. - Fix a race condition that could cause crashes or memory corruption
  6330. when running as a server with a controller listening for log
  6331. messages.
  6332. - Avoid crashing when we have a policy specified in a DirPolicy or
  6333. SocksPolicy or ReachableAddresses option with ports set on it,
  6334. and we re-load the policy. May fix bug 996.
  6335. - Fix an assertion failure on 64-bit platforms when we allocated
  6336. memory right up to the end of a memarea, then realigned the memory
  6337. one step beyond the end. Fixes a possible cause of bug 930.
  6338. - Protect the count of open sockets with a mutex, so we can't
  6339. corrupt it when two threads are closing or opening sockets at once.
  6340. Fix for bug 939. Bugfix on 0.2.0.1-alpha.
  6341. o Major bugfixes (clients):
  6342. - Discard router descriptors as we load them if they are more than
  6343. five days old. Otherwise if Tor is off for a long time and then
  6344. starts with cached descriptors, it will try to use the onion keys
  6345. in those obsolete descriptors when building circuits. Fixes bug 887.
  6346. - When we choose to abandon a new entry guard because we think our
  6347. older ones might be better, close any circuits pending on that
  6348. new entry guard connection. This fix should make us recover much
  6349. faster when our network is down and then comes back. Bugfix on
  6350. 0.1.2.8-beta; found by lodger.
  6351. - When Tor clients restart after 1-5 days, they discard all their
  6352. cached descriptors as too old, but they still use the cached
  6353. consensus document. This approach is good for robustness, but
  6354. bad for performance: since they don't know any bandwidths, they
  6355. end up choosing at random rather than weighting their choice by
  6356. speed. Fixed by the above feature of putting bandwidths in the
  6357. consensus.
  6358. o Major bugfixes (relays):
  6359. - Relays were falling out of the networkstatus consensus for
  6360. part of a day if they changed their local config but the
  6361. authorities discarded their new descriptor as "not sufficiently
  6362. different". Now directory authorities accept a descriptor as changed
  6363. if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
  6364. patch by Sebastian.
  6365. - Ensure that two circuits can never exist on the same connection
  6366. with the same circuit ID, even if one is marked for close. This
  6367. is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
  6368. - Directory authorities were neglecting to mark relays down in their
  6369. internal histories if the relays fall off the routerlist without
  6370. ever being found unreachable. So there were relays in the histories
  6371. that haven't been seen for eight months, and are listed as being
  6372. up for eight months. This wreaked havoc on the "median wfu" and
  6373. "median mtbf" calculations, in turn making Guard and Stable flags
  6374. wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
  6375. on 0.2.0.6-alpha.
  6376. o Major bugfixes (hidden services):
  6377. - When establishing a hidden service, introduction points that
  6378. originate from cannibalized circuits were completely ignored
  6379. and not included in rendezvous service descriptors. This might
  6380. have been another reason for delay in making a hidden service
  6381. available. Bugfix from long ago (0.0.9.x?)
  6382. o Major bugfixes (memory and resource management):
  6383. - Fixed some memory leaks -- some quite frequent, some almost
  6384. impossible to trigger -- based on results from Coverity.
  6385. - Speed up parsing and cut down on memory fragmentation by using
  6386. stack-style allocations for parsing directory objects. Previously,
  6387. this accounted for over 40% of allocations from within Tor's code
  6388. on a typical directory cache.
  6389. - Use a Bloom filter rather than a digest-based set to track which
  6390. descriptors we need to keep around when we're cleaning out old
  6391. router descriptors. This speeds up the computation significantly,
  6392. and may reduce fragmentation.
  6393. o New/changed config options:
  6394. - Now NodeFamily and MyFamily config options allow spaces in
  6395. identity fingerprints, so it's easier to paste them in.
  6396. Suggested by Lucky Green.
  6397. - Allow ports 465 and 587 in the default exit policy again. We had
  6398. rejected them in 0.1.0.15, because back in 2005 they were commonly
  6399. misconfigured and ended up as spam targets. We hear they are better
  6400. locked down these days.
  6401. - Make TrackHostExit mappings expire a while after their last use, not
  6402. after their creation. Patch from Robert Hogan.
  6403. - Add an ExcludeExitNodes option so users can list a set of nodes
  6404. that should be be excluded from the exit node position, but
  6405. allowed elsewhere. Implements proposal 151.
  6406. - New --hush command-line option similar to --quiet. While --quiet
  6407. disables all logging to the console on startup, --hush limits the
  6408. output to messages of warning and error severity.
  6409. - New configure/torrc options (--enable-geoip-stats,
  6410. DirRecordUsageByCountry) to record how many IPs we've served
  6411. directory info to in each country code, how many status documents
  6412. total we've sent to each country code, and what share of the total
  6413. directory requests we should expect to see.
  6414. - Make outbound DNS packets respect the OutboundBindAddress setting.
  6415. Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
  6416. - Allow separate log levels to be configured for different logging
  6417. domains. For example, this allows one to log all notices, warnings,
  6418. or errors, plus all memory management messages of level debug or
  6419. higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
  6420. - Update to the "June 3 2009" ip-to-country file.
  6421. o Minor features (relays):
  6422. - Raise the minimum rate limiting to be a relay from 20000 bytes
  6423. to 20480 bytes (aka 20KB/s), to match our documentation. Also
  6424. update directory authorities so they always assign the Fast flag
  6425. to relays with 20KB/s of capacity. Now people running relays won't
  6426. suddenly find themselves not seeing any use, if the network gets
  6427. faster on average.
  6428. - If we're a relay and we change our IP address, be more verbose
  6429. about the reason that made us change. Should help track down
  6430. further bugs for relays on dynamic IP addresses.
  6431. - Exit servers can now answer resolve requests for ip6.arpa addresses.
  6432. - Implement most of Proposal 152: allow specialized servers to permit
  6433. single-hop circuits, and clients to use those servers to build
  6434. single-hop circuits when using a specialized controller. Patch
  6435. from Josh Albrecht. Resolves feature request 768.
  6436. - When relays do their initial bandwidth measurement, don't limit
  6437. to just our entry guards for the test circuits. Otherwise we tend
  6438. to have multiple test circuits going through a single entry guard,
  6439. which makes our bandwidth test less accurate. Fixes part of bug 654;
  6440. patch contributed by Josh Albrecht.
  6441. o Minor features (directory authorities):
  6442. - Try not to open more than one descriptor-downloading connection
  6443. to an authority at once. This should reduce load on directory
  6444. authorities. Fixes bug 366.
  6445. - Add cross-certification to newly generated certificates, so that
  6446. a signing key is enough information to look up a certificate. Start
  6447. serving certificates by <identity digest, signing key digest>
  6448. pairs. Implements proposal 157.
  6449. - When a directory authority downloads a descriptor that it then
  6450. immediately rejects, do not retry downloading it right away. Should
  6451. save some bandwidth on authorities. Fix for bug 888. Patch by
  6452. Sebastian Hahn.
  6453. - Directory authorities now serve a /tor/dbg-stability.txt URL to
  6454. help debug WFU and MTBF calculations.
  6455. - In directory authorities' approved-routers files, allow
  6456. fingerprints with or without space.
  6457. o Minor features (directory mirrors):
  6458. - When a download gets us zero good descriptors, do not notify
  6459. Tor that new directory information has arrived.
  6460. - Servers support a new URL scheme for consensus downloads that
  6461. allows the client to specify which authorities are trusted.
  6462. The server then only sends the consensus if the client will trust
  6463. it. Otherwise a 404 error is sent back. Clients use this
  6464. new scheme when the server supports it (meaning it's running
  6465. 0.2.1.1-alpha or later). Implements proposal 134.
  6466. o Minor features (bridges):
  6467. - If the bridge config line doesn't specify a port, assume 443.
  6468. This makes bridge lines a bit smaller and easier for users to
  6469. understand.
  6470. - If we're using bridges and our network goes away, be more willing
  6471. to forgive our bridges and try again when we get an application
  6472. request.
  6473. o Minor features (hidden services):
  6474. - When the client launches an introduction circuit, retry with a
  6475. new circuit after 30 seconds rather than 60 seconds.
  6476. - Launch a second client-side introduction circuit in parallel
  6477. after a delay of 15 seconds (based on work by Christian Wilms).
  6478. - Hidden services start out building five intro circuits rather
  6479. than three, and when the first three finish they publish a service
  6480. descriptor using those. Now we publish our service descriptor much
  6481. faster after restart.
  6482. - Drop the requirement to have an open dir port for storing and
  6483. serving v2 hidden service descriptors.
  6484. o Minor features (build and packaging):
  6485. - On Linux, use the prctl call to re-enable core dumps when the User
  6486. option is set.
  6487. - Try to make sure that the version of Libevent we're running with
  6488. is binary-compatible with the one we built with. May address bug
  6489. 897 and others.
  6490. - Add a new --enable-local-appdata configuration switch to change
  6491. the default location of the datadir on win32 from APPDATA to
  6492. LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
  6493. entirely. Patch from coderman.
  6494. - Build correctly against versions of OpenSSL 0.9.8 or later that
  6495. are built without support for deprecated functions.
  6496. - On platforms with a maximum syslog string length, truncate syslog
  6497. messages to that length ourselves, rather than relying on the
  6498. system to do it for us.
  6499. - Automatically detect MacOSX versions earlier than 10.4.0, and
  6500. disable kqueue from inside Tor when running with these versions.
  6501. We previously did this from the startup script, but that was no
  6502. help to people who didn't use the startup script. Resolves bug 863.
  6503. - Build correctly when configured to build outside the main source
  6504. path. Patch from Michael Gold.
  6505. - Disable GCC's strict alias optimization by default, to avoid the
  6506. likelihood of its introducing subtle bugs whenever our code violates
  6507. the letter of C99's alias rules.
  6508. - Change the contrib/tor.logrotate script so it makes the new
  6509. logs as "_tor:_tor" rather than the default, which is generally
  6510. "root:wheel". Fixes bug 676, reported by Serge Koksharov.
  6511. - Change our header file guard macros to be less likely to conflict
  6512. with system headers. Adam Langley noticed that we were conflicting
  6513. with log.h on Android.
  6514. - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
  6515. and stop using a warning that had become unfixably verbose under
  6516. GCC 4.3.
  6517. - Use a lockfile to make sure that two Tor processes are not
  6518. simultaneously running with the same datadir.
  6519. - Allow OpenSSL to use dynamic locks if it wants.
  6520. - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
  6521. o Minor features (controllers):
  6522. - When generating circuit events with verbose nicknames for
  6523. controllers, try harder to look up nicknames for routers on a
  6524. circuit. (Previously, we would look in the router descriptors we had
  6525. for nicknames, but not in the consensus.) Partial fix for bug 941.
  6526. - New controller event NEWCONSENSUS that lists the networkstatus
  6527. lines for every recommended relay. Now controllers like Torflow
  6528. can keep up-to-date on which relays they should be using.
  6529. - New controller event "clients_seen" to report a geoip-based summary
  6530. of which countries we've seen clients from recently. Now controllers
  6531. like Vidalia can show bridge operators that they're actually making
  6532. a difference.
  6533. - Add a 'getinfo status/clients-seen' controller command, in case
  6534. controllers want to hear clients_seen events but connect late.
  6535. - New CONSENSUS_ARRIVED event to note when a new consensus has
  6536. been fetched and validated.
  6537. - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
  6538. controllers to prevent SIGHUP from reloading the configuration.
  6539. Fixes bug 856.
  6540. - Return circuit purposes in response to GETINFO circuit-status.
  6541. Fixes bug 858.
  6542. - Serve the latest v3 networkstatus consensus via the control
  6543. port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
  6544. - Add a "GETINFO /status/bootstrap-phase" controller option, so the
  6545. controller can query our current bootstrap state in case it attaches
  6546. partway through and wants to catch up.
  6547. - Provide circuit purposes along with circuit events to the controller.
  6548. o Minor features (tools):
  6549. - Do not have tor-resolve automatically refuse all .onion addresses;
  6550. if AutomapHostsOnResolve is set in your torrc, this will work fine.
  6551. - Add a -p option to tor-resolve for specifying the SOCKS port: some
  6552. people find host:port too confusing.
  6553. - Print the SOCKS5 error message string as well as the error code
  6554. when a tor-resolve request fails. Patch from Jacob.
  6555. o Minor bugfixes (memory and resource management):
  6556. - Clients no longer cache certificates for authorities they do not
  6557. recognize. Bugfix on 0.2.0.9-alpha.
  6558. - Do not use C's stdio library for writing to log files. This will
  6559. improve logging performance by a minute amount, and will stop
  6560. leaking fds when our disk is full. Fixes bug 861.
  6561. - Stop erroneous use of O_APPEND in cases where we did not in fact
  6562. want to re-seek to the end of a file before every last write().
  6563. - Fix a small alignment and memory-wasting bug on buffer chunks.
  6564. Spotted by rovv.
  6565. - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
  6566. to avoid unused RAM in buffer chunks and memory pools.
  6567. - Reduce the default smartlist size from 32 to 16; it turns out that
  6568. most smartlists hold around 8-12 elements tops.
  6569. - Make dumpstats() log the fullness and size of openssl-internal
  6570. buffers.
  6571. - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
  6572. patch to their OpenSSL, turn it on to save memory on servers. This
  6573. patch will (with any luck) get included in a mainline distribution
  6574. before too long.
  6575. - Fix a memory leak when v3 directory authorities load their keys
  6576. and cert from disk. Bugfix on 0.2.0.1-alpha.
  6577. - Stop using malloc_usable_size() to use more area than we had
  6578. actually allocated: it was safe, but made valgrind really unhappy.
  6579. - Make the assert_circuit_ok() function work correctly on circuits that
  6580. have already been marked for close.
  6581. - Fix uninitialized size field for memory area allocation: may improve
  6582. memory performance during directory parsing.
  6583. o Minor bugfixes (clients):
  6584. - Stop reloading the router list from disk for no reason when we
  6585. run out of reachable directory mirrors. Once upon a time reloading
  6586. it would set the 'is_running' flag back to 1 for them. It hasn't
  6587. done that for a long time.
  6588. - When we had picked an exit node for a connection, but marked it as
  6589. "optional", and it turned out we had no onion key for the exit,
  6590. stop wanting that exit and try again. This situation may not
  6591. be possible now, but will probably become feasible with proposal
  6592. 158. Spotted by rovv. Fixes another case of bug 752.
  6593. - Fix a bug in address parsing that was preventing bridges or hidden
  6594. service targets from being at IPv6 addresses.
  6595. - Do not remove routers as too old if we do not have any consensus
  6596. document. Bugfix on 0.2.0.7-alpha.
  6597. - When an exit relay resolves a stream address to a local IP address,
  6598. do not just keep retrying that same exit relay over and
  6599. over. Instead, just close the stream. Addresses bug 872. Bugfix
  6600. on 0.2.0.32. Patch from rovv.
  6601. - Made Tor a little less aggressive about deleting expired
  6602. certificates. Partial fix for bug 854.
  6603. - Treat duplicate certificate fetches as failures, so that we do
  6604. not try to re-fetch an expired certificate over and over and over.
  6605. - Do not say we're fetching a certificate when we'll in fact skip it
  6606. because of a pending download.
  6607. - If we have correct permissions on $datadir, we complain to stdout
  6608. and fail to start. But dangerous permissions on
  6609. $datadir/cached-status/ would cause us to open a log and complain
  6610. there. Now complain to stdout and fail to start in both cases. Fixes
  6611. bug 820, reported by seeess.
  6612. o Minor bugfixes (bridges):
  6613. - When we made bridge authorities stop serving bridge descriptors over
  6614. unencrypted links, we also broke DirPort reachability testing for
  6615. bridges. So bridges with a non-zero DirPort were printing spurious
  6616. warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
  6617. - Don't allow a bridge to publish its router descriptor to a
  6618. non-bridge directory authority. Fixes part of bug 932.
  6619. - When we change to or from being a bridge, reset our counts of
  6620. client usage by country. Fixes bug 932.
  6621. o Minor bugfixes (relays):
  6622. - Log correct error messages for DNS-related network errors on
  6623. Windows.
  6624. - Actually return -1 in the error case for read_bandwidth_usage().
  6625. Harmless bug, since we currently don't care about the return value
  6626. anywhere. Bugfix on 0.2.0.9-alpha.
  6627. - Provide a more useful log message if bug 977 (related to buffer
  6628. freelists) ever reappears, and do not crash right away.
  6629. - We were already rejecting relay begin cells with destination port
  6630. of 0. Now also reject extend cells with destination port or address
  6631. of 0. Suggested by lark.
  6632. - When we can't transmit a DNS request due to a network error, retry
  6633. it after a while, and eventually transmit a failing response to
  6634. the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
  6635. - Solve a bug that kept hardware crypto acceleration from getting
  6636. enabled when accounting was turned on. Fixes bug 907. Bugfix on
  6637. 0.0.9pre6.
  6638. - When a canonical connection appears later in our internal list
  6639. than a noncanonical one for a given OR ID, always use the
  6640. canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
  6641. Spotted by rovv.
  6642. - Avoid some nasty corner cases in the logic for marking connections
  6643. as too old or obsolete or noncanonical for circuits. Partial
  6644. bugfix on bug 891.
  6645. - Fix another interesting corner-case of bug 891 spotted by rovv:
  6646. Previously, if two hosts had different amounts of clock drift, and
  6647. one of them created a new connection with just the wrong timing,
  6648. the other might decide to deprecate the new connection erroneously.
  6649. Bugfix on 0.1.1.13-alpha.
  6650. - If one win32 nameserver fails to get added, continue adding the
  6651. rest, and don't automatically fail.
  6652. - Fix a bug where an unreachable relay would establish enough
  6653. reachability testing circuits to do a bandwidth test -- if
  6654. we already have a connection to the middle hop of the testing
  6655. circuit, then it could establish the last hop by using the existing
  6656. connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
  6657. circuits no longer use entry guards in 0.2.1.3-alpha.
  6658. o Minor bugfixes (directory authorities):
  6659. - Limit uploaded directory documents to be 16M rather than 500K.
  6660. The directory authorities were refusing v3 consensus votes from
  6661. other authorities, since the votes are now 504K. Fixes bug 959;
  6662. bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
  6663. - Directory authorities should never send a 503 "busy" response to
  6664. requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
  6665. bug 959.
  6666. - Fix code so authorities _actually_ send back X-Descriptor-Not-New
  6667. headers. Bugfix on 0.2.0.10-alpha.
  6668. o Minor bugfixes (hidden services):
  6669. - When we can't find an intro key for a v2 hidden service descriptor,
  6670. fall back to the v0 hidden service descriptor and log a bug message.
  6671. Workaround for bug 1024.
  6672. - In very rare situations new hidden service descriptors were
  6673. published earlier than 30 seconds after the last change to the
  6674. service. (We currently think that a hidden service descriptor
  6675. that's been stable for 30 seconds is worth publishing.)
  6676. - If a hidden service sends us an END cell, do not consider
  6677. retrying the connection; just close it. Patch from rovv.
  6678. - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
  6679. service directories if they have no advertised dir port. Bugfix
  6680. on 0.2.0.10-alpha.
  6681. o Minor bugfixes (tools):
  6682. - In the torify(1) manpage, mention that tsocks will leak your
  6683. DNS requests.
  6684. o Minor bugfixes (controllers):
  6685. - If the controller claimed responsibility for a stream, but that
  6686. stream never finished making its connection, it would live
  6687. forever in circuit_wait state. Now we close it after SocksTimeout
  6688. seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
  6689. - Make DNS resolved controller events into "CLOSED", not
  6690. "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
  6691. bug 807.
  6692. - The control port would close the connection before flushing long
  6693. replies, such as the network consensus, if a QUIT command was issued
  6694. before the reply had completed. Now, the control port flushes all
  6695. pending replies before closing the connection. Also fix a spurious
  6696. warning when a QUIT command is issued after a malformed or rejected
  6697. AUTHENTICATE command, but before the connection was closed. Patch
  6698. by Marcus Griep. Fixes bugs 1015 and 1016.
  6699. - Fix a bug that made stream bandwidth get misreported to the
  6700. controller.
  6701. o Deprecated and removed features:
  6702. - The old "tor --version --version" command, which would print out
  6703. the subversion "Id" of most of the source files, is now removed. It
  6704. turned out to be less useful than we'd expected, and harder to
  6705. maintain.
  6706. - RedirectExits has been removed. It was deprecated since
  6707. 0.2.0.3-alpha.
  6708. - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
  6709. has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
  6710. - Cell pools are now always enabled; --disable-cell-pools is ignored.
  6711. - Directory mirrors no longer fetch the v1 directory or
  6712. running-routers files. They are obsolete, and nobody asks for them
  6713. anymore. This is the first step to making v1 authorities obsolete.
  6714. - Take out the TestVia config option, since it was a workaround for
  6715. a bug that was fixed in Tor 0.1.1.21.
  6716. - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
  6717. HiddenServiceExcludeNodes as obsolete: they never worked properly,
  6718. and nobody seems to be using them. Fixes bug 754. Bugfix on
  6719. 0.1.0.1-rc. Patch from Christian Wilms.
  6720. - Remove all backward-compatibility code for relays running
  6721. versions of Tor so old that they no longer work at all on the
  6722. Tor network.
  6723. o Code simplifications and refactoring:
  6724. - Tool-assisted documentation cleanup. Nearly every function or
  6725. static variable in Tor should have its own documentation now.
  6726. - Rename the confusing or_is_obsolete field to the more appropriate
  6727. is_bad_for_new_circs, and move it to or_connection_t where it
  6728. belongs.
  6729. - Move edge-only flags from connection_t to edge_connection_t: not
  6730. only is this better coding, but on machines of plausible alignment,
  6731. it should save 4-8 bytes per connection_t. "Every little bit helps."
  6732. - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
  6733. for consistency; keep old option working for backward compatibility.
  6734. - Simplify the code for finding connections to use for a circuit.
  6735. - Revise the connection_new functions so that a more typesafe variant
  6736. exists. This will work better with Coverity, and let us find any
  6737. actual mistakes we're making here.
  6738. - Refactor unit testing logic so that dmalloc can be used sensibly
  6739. with unit tests to check for memory leaks.
  6740. - Move all hidden-service related fields from connection and circuit
  6741. structure to substructures: this way they won't eat so much memory.
  6742. - Squeeze 2-5% out of client performance (according to oprofile) by
  6743. improving the implementation of some policy-manipulation functions.
  6744. - Change the implementation of ExcludeNodes and ExcludeExitNodes to
  6745. be more efficient. Formerly it was quadratic in the number of
  6746. servers; now it should be linear. Fixes bug 509.
  6747. - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
  6748. and n_conn_id_digest fields into a separate structure that's
  6749. only needed when the circuit has not yet attached to an n_conn.
  6750. - Optimize out calls to time(NULL) that occur for every IO operation,
  6751. or for every cell. On systems like Windows where time() is a
  6752. slow syscall, this fix will be slightly helpful.
  6753. Changes in version 0.2.0.35 - 2009-06-24
  6754. o Security fix:
  6755. - Avoid crashing in the presence of certain malformed descriptors.
  6756. Found by lark, and by automated fuzzing.
  6757. - Fix an edge case where a malicious exit relay could convince a
  6758. controller that the client's DNS question resolves to an internal IP
  6759. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  6760. o Major bugfixes:
  6761. - Finally fix the bug where dynamic-IP relays disappear when their
  6762. IP address changes: directory mirrors were mistakenly telling
  6763. them their old address if they asked via begin_dir, so they
  6764. never got an accurate answer about their new address, so they
  6765. just vanished after a day. For belt-and-suspenders, relays that
  6766. don't set Address in their config now avoid using begin_dir for
  6767. all direct connections. Should fix bugs 827, 883, and 900.
  6768. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  6769. that would occur on some exit nodes when DNS failures and timeouts
  6770. occurred in certain patterns. Fix for bug 957.
  6771. o Minor bugfixes:
  6772. - When starting with a cache over a few days old, do not leak
  6773. memory for the obsolete router descriptors in it. Bugfix on
  6774. 0.2.0.33; fixes bug 672.
  6775. - Hidden service clients didn't use a cached service descriptor that
  6776. was older than 15 minutes, but wouldn't fetch a new one either,
  6777. because there was already one in the cache. Now, fetch a v2
  6778. descriptor unless the same descriptor was added to the cache within
  6779. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  6780. Changes in version 0.2.0.34 - 2009-02-08
  6781. Tor 0.2.0.34 features several more security-related fixes. You should
  6782. upgrade, especially if you run an exit relay (remote crash) or a
  6783. directory authority (remote infinite loop), or you're on an older
  6784. (pre-XP) or not-recently-patched Windows (remote exploit).
  6785. This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  6786. have many known flaws, and nobody should be using them. You should
  6787. upgrade. If you're using a Linux or BSD and its packages are obsolete,
  6788. stop using those packages and upgrade anyway.
  6789. o Security fixes:
  6790. - Fix an infinite-loop bug on handling corrupt votes under certain
  6791. circumstances. Bugfix on 0.2.0.8-alpha.
  6792. - Fix a temporary DoS vulnerability that could be performed by
  6793. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  6794. - Avoid a potential crash on exit nodes when processing malformed
  6795. input. Remote DoS opportunity. Bugfix on 0.2.0.33.
  6796. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  6797. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  6798. o Minor bugfixes:
  6799. - Fix compilation on systems where time_t is a 64-bit integer.
  6800. Patch from Matthias Drochner.
  6801. - Don't consider expiring already-closed client connections. Fixes
  6802. bug 893. Bugfix on 0.0.2pre20.
  6803. Changes in version 0.2.0.33 - 2009-01-21
  6804. Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  6805. useful to users. It also finally fixes a bug where a relay or client
  6806. that's been off for many days would take a long time to bootstrap.
  6807. This update also fixes an important security-related bug reported by
  6808. Ilja van Sprundel. You should upgrade. (We'll send out more details
  6809. about the bug once people have had some time to upgrade.)
  6810. o Security fixes:
  6811. - Fix a heap-corruption bug that may be remotely triggerable on
  6812. some platforms. Reported by Ilja van Sprundel.
  6813. o Major bugfixes:
  6814. - When a stream at an exit relay is in state "resolving" or
  6815. "connecting" and it receives an "end" relay cell, the exit relay
  6816. would silently ignore the end cell and not close the stream. If
  6817. the client never closes the circuit, then the exit relay never
  6818. closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
  6819. reported by "wood".
  6820. - When sending CREATED cells back for a given circuit, use a 64-bit
  6821. connection ID to find the right connection, rather than an addr:port
  6822. combination. Now that we can have multiple OR connections between
  6823. the same ORs, it is no longer possible to use addr:port to uniquely
  6824. identify a connection.
  6825. - Bridge relays that had DirPort set to 0 would stop fetching
  6826. descriptors shortly after startup, and then briefly resume
  6827. after a new bandwidth test and/or after publishing a new bridge
  6828. descriptor. Bridge users that try to bootstrap from them would
  6829. get a recent networkstatus but would get descriptors from up to
  6830. 18 hours earlier, meaning most of the descriptors were obsolete
  6831. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  6832. - Prevent bridge relays from serving their 'extrainfo' document
  6833. to anybody who asks, now that extrainfo docs include potentially
  6834. sensitive aggregated client geoip summaries. Bugfix on
  6835. 0.2.0.13-alpha.
  6836. - If the cached networkstatus consensus is more than five days old,
  6837. discard it rather than trying to use it. In theory it could be
  6838. useful because it lists alternate directory mirrors, but in practice
  6839. it just means we spend many minutes trying directory mirrors that
  6840. are long gone from the network. Also discard router descriptors as
  6841. we load them if they are more than five days old, since the onion
  6842. key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
  6843. o Minor bugfixes:
  6844. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  6845. could make gcc generate non-functional binary search code. Bugfix
  6846. on 0.2.0.10-alpha.
  6847. - Build correctly on platforms without socklen_t.
  6848. - Compile without warnings on solaris.
  6849. - Avoid potential crash on internal error during signature collection.
  6850. Fixes bug 864. Patch from rovv.
  6851. - Correct handling of possible malformed authority signing key
  6852. certificates with internal signature types. Fixes bug 880.
  6853. Bugfix on 0.2.0.3-alpha.
  6854. - Fix a hard-to-trigger resource leak when logging credential status.
  6855. CID 349.
  6856. - When we can't initialize DNS because the network is down, do not
  6857. automatically stop Tor from starting. Instead, we retry failed
  6858. dns_init() every 10 minutes, and change the exit policy to reject
  6859. *:* until one succeeds. Fixes bug 691.
  6860. - Use 64 bits instead of 32 bits for connection identifiers used with
  6861. the controller protocol, to greatly reduce risk of identifier reuse.
  6862. - When we're choosing an exit node for a circuit, and we have
  6863. no pending streams, choose a good general exit rather than one that
  6864. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  6865. - Fix another case of assuming, when a specific exit is requested,
  6866. that we know more than the user about what hosts it allows.
  6867. Fixes one case of bug 752. Patch from rovv.
  6868. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  6869. seconds. Warn the user if lower values are given in the
  6870. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  6871. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  6872. user if lower values are given in the configuration. Bugfix on
  6873. 0.1.1.17-rc. Patch by Sebastian.
  6874. - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
  6875. the cache because we already had a v0 descriptor with the same ID.
  6876. Bugfix on 0.2.0.18-alpha.
  6877. - Fix a race condition when freeing keys shared between main thread
  6878. and CPU workers that could result in a memory leak. Bugfix on
  6879. 0.1.0.1-rc. Fixes bug 889.
  6880. - Send a valid END cell back when a client tries to connect to a
  6881. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  6882. 840. Patch from rovv.
  6883. - Check which hops rendezvous stream cells are associated with to
  6884. prevent possible guess-the-streamid injection attacks from
  6885. intermediate hops. Fixes another case of bug 446. Based on patch
  6886. from rovv.
  6887. - If a broken client asks a non-exit router to connect somewhere,
  6888. do not even do the DNS lookup before rejecting the connection.
  6889. Fixes another case of bug 619. Patch from rovv.
  6890. - When a relay gets a create cell it can't decrypt (e.g. because it's
  6891. using the wrong onion key), we were dropping it and letting the
  6892. client time out. Now actually answer with a destroy cell. Fixes
  6893. bug 904. Bugfix on 0.0.2pre8.
  6894. o Minor bugfixes (hidden services):
  6895. - Do not throw away existing introduction points on SIGHUP. Bugfix on
  6896. 0.0.6pre1. Patch by Karsten. Fixes bug 874.
  6897. o Minor features:
  6898. - Report the case where all signatures in a detached set are rejected
  6899. differently than the case where there is an error handling the
  6900. detached set.
  6901. - When we realize that another process has modified our cached
  6902. descriptors, print out a more useful error message rather than
  6903. triggering an assertion. Fixes bug 885. Patch from Karsten.
  6904. - Implement the 0x20 hack to better resist DNS poisoning: set the
  6905. case on outgoing DNS requests randomly, and reject responses that do
  6906. not match the case correctly. This logic can be disabled with the
  6907. ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
  6908. of servers that do not reliably preserve case in replies. See
  6909. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  6910. for more info.
  6911. - Check DNS replies for more matching fields to better resist DNS
  6912. poisoning.
  6913. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  6914. compress cells, which are basically all encrypted, compressed, or
  6915. both.
  6916. Changes in version 0.2.0.32 - 2008-11-20
  6917. Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  6918. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  6919. a smaller security flaw that might allow an attacker to access local
  6920. services, further improves hidden service performance, and fixes a
  6921. variety of other issues.
  6922. o Security fixes:
  6923. - The "User" and "Group" config options did not clear the
  6924. supplementary group entries for the Tor process. The "User" option
  6925. is now more robust, and we now set the groups to the specified
  6926. user's primary group. The "Group" option is now ignored. For more
  6927. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  6928. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  6929. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
  6930. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  6931. consistently obeyed: if an exit relay refuses a stream because its
  6932. exit policy doesn't allow it, we would remember what IP address
  6933. the relay said the destination address resolves to, even if it's
  6934. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  6935. o Major bugfixes:
  6936. - Fix a DOS opportunity during the voting signature collection process
  6937. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  6938. o Major bugfixes (hidden services):
  6939. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  6940. we were failing the whole hidden service request when the v0
  6941. descriptor fetch fails, even if the v2 fetch is still pending and
  6942. might succeed. Similarly, if the last v2 fetch fails, we were
  6943. failing the whole hidden service request even if a v0 fetch is
  6944. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  6945. - When extending a circuit to a hidden service directory to upload a
  6946. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  6947. requests failed, because the router descriptor has not been
  6948. downloaded yet. In these cases, do not attempt to upload the
  6949. rendezvous descriptor, but wait until the router descriptor is
  6950. downloaded and retry. Likewise, do not attempt to fetch a rendezvous
  6951. descriptor from a hidden service directory for which the router
  6952. descriptor has not yet been downloaded. Fixes bug 767. Bugfix
  6953. on 0.2.0.10-alpha.
  6954. o Minor bugfixes:
  6955. - Fix several infrequent memory leaks spotted by Coverity.
  6956. - When testing for libevent functions, set the LDFLAGS variable
  6957. correctly. Found by Riastradh.
  6958. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  6959. bootstrapping with tunneled directory connections. Bugfix on
  6960. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  6961. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  6962. and we know that server B rejects most-but-not all connections to
  6963. port 80, we would previously reject the connection. Now, we assume
  6964. the user knows what they were asking for. Fixes bug 752. Bugfix
  6965. on 0.0.9rc5. Diagnosed by BarkerJr.
  6966. - If we overrun our per-second write limits a little, count this as
  6967. having used up our write allocation for the second, and choke
  6968. outgoing directory writes. Previously, we had only counted this when
  6969. we had met our limits precisely. Fixes bug 824. Patch from by rovv.
  6970. Bugfix on 0.2.0.x (??).
  6971. - Remove the old v2 directory authority 'lefkada' from the default
  6972. list. It has been gone for many months.
  6973. - Stop doing unaligned memory access that generated bus errors on
  6974. sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
  6975. - Make USR2 log-level switch take effect immediately. Bugfix on
  6976. 0.1.2.8-beta.
  6977. o Minor bugfixes (controller):
  6978. - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
  6979. 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
  6980. Changes in version 0.2.0.31 - 2008-09-03
  6981. Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  6982. a big bug we're seeing where in rare cases traffic from one Tor stream
  6983. gets mixed into another stream, and fixes a variety of smaller issues.
  6984. o Major bugfixes:
  6985. - Make sure that two circuits can never exist on the same connection
  6986. with the same circuit ID, even if one is marked for close. This
  6987. is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
  6988. - Relays now reject risky extend cells: if the extend cell includes
  6989. a digest of all zeroes, or asks to extend back to the relay that
  6990. sent the extend cell, tear down the circuit. Ideas suggested
  6991. by rovv.
  6992. - If not enough of our entry guards are available so we add a new
  6993. one, we might use the new one even if it overlapped with the
  6994. current circuit's exit relay (or its family). Anonymity bugfix
  6995. pointed out by rovv.
  6996. o Minor bugfixes:
  6997. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  6998. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  6999. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  7000. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  7001. - Pick size of default geoip filename string correctly on windows.
  7002. Fixes bug 806. Bugfix on 0.2.0.30.
  7003. - Make the autoconf script accept the obsolete --with-ssl-dir
  7004. option as an alias for the actually-working --with-openssl-dir
  7005. option. Fix the help documentation to recommend --with-openssl-dir.
  7006. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  7007. - When using the TransPort option on OpenBSD, and using the User
  7008. option to change UID and drop privileges, make sure to open
  7009. /dev/pf before dropping privileges. Fixes bug 782. Patch from
  7010. Christopher Davis. Bugfix on 0.1.2.1-alpha.
  7011. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  7012. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  7013. on the client side when connecting to a hidden service. Bugfix
  7014. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  7015. - When closing an application-side connection because its circuit is
  7016. getting torn down, generate the stream event correctly. Bugfix on
  7017. 0.1.2.x. Anonymous patch.
  7018. Changes in version 0.2.0.30 - 2008-07-15
  7019. This new stable release switches to a more efficient directory
  7020. distribution design, adds features to make connections to the Tor
  7021. network harder to block, allows Tor to act as a DNS proxy, adds separate
  7022. rate limiting for relayed traffic to make it easier for clients to
  7023. become relays, fixes a variety of potential anonymity problems, and
  7024. includes the usual huge pile of other features and bug fixes.
  7025. o New v3 directory design:
  7026. - Tor now uses a new way to learn about and distribute information
  7027. about the network: the directory authorities vote on a common
  7028. network status document rather than each publishing their own
  7029. opinion. Now clients and caches download only one networkstatus
  7030. document to bootstrap, rather than downloading one for each
  7031. authority. Clients only download router descriptors listed in
  7032. the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
  7033. for details.
  7034. - Set up moria1, tor26, and dizum as v3 directory authorities
  7035. in addition to being v2 authorities. Also add three new ones:
  7036. ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
  7037. dannenberg (run by CCC).
  7038. - Switch to multi-level keys for directory authorities: now their
  7039. long-term identity key can be kept offline, and they periodically
  7040. generate a new signing key. Clients fetch the "key certificates"
  7041. to keep up to date on the right keys. Add a standalone tool
  7042. "tor-gencert" to generate key certificates. Implements proposal 103.
  7043. - Add a new V3AuthUseLegacyKey config option to make it easier for
  7044. v3 authorities to change their identity keys if another bug like
  7045. Debian's OpenSSL RNG flaw appears.
  7046. - Authorities and caches fetch the v2 networkstatus documents
  7047. less often, now that v3 is recommended.
  7048. o Make Tor connections stand out less on the wire:
  7049. - Use an improved TLS handshake designed by Steven Murdoch in proposal
  7050. 124, as revised in proposal 130. The new handshake is meant to
  7051. be harder for censors to fingerprint, and it adds the ability
  7052. to detect certain kinds of man-in-the-middle traffic analysis
  7053. attacks. The new handshake format includes version negotiation for
  7054. OR connections as described in proposal 105, which will allow us
  7055. to improve Tor's link protocol more safely in the future.
  7056. - Enable encrypted directory connections by default for non-relays,
  7057. so censor tools that block Tor directory connections based on their
  7058. plaintext patterns will no longer work. This means Tor works in
  7059. certain censored countries by default again.
  7060. - Stop including recognizeable strings in the commonname part of
  7061. Tor's x509 certificates.
  7062. o Implement bridge relays:
  7063. - Bridge relays (or "bridges" for short) are Tor relays that aren't
  7064. listed in the main Tor directory. Since there is no complete public
  7065. list of them, even an ISP that is filtering connections to all the
  7066. known Tor relays probably won't be able to block all the bridges.
  7067. See doc/design-paper/blocking.pdf and proposal 125 for details.
  7068. - New config option BridgeRelay that specifies you want to be a
  7069. bridge relay rather than a normal relay. When BridgeRelay is set
  7070. to 1, then a) you cache dir info even if your DirPort ins't on,
  7071. and b) the default for PublishServerDescriptor is now "bridge"
  7072. rather than "v2,v3".
  7073. - New config option "UseBridges 1" for clients that want to use bridge
  7074. relays instead of ordinary entry guards. Clients then specify
  7075. bridge relays by adding "Bridge" lines to their config file. Users
  7076. can learn about a bridge relay either manually through word of
  7077. mouth, or by one of our rate-limited mechanisms for giving out
  7078. bridge addresses without letting an attacker easily enumerate them
  7079. all. See https://www.torproject.org/bridges for details.
  7080. - Bridge relays behave like clients with respect to time intervals
  7081. for downloading new v3 consensus documents -- otherwise they
  7082. stand out. Bridge users now wait until the end of the interval,
  7083. so their bridge relay will be sure to have a new consensus document.
  7084. o Implement bridge directory authorities:
  7085. - Bridge authorities are like normal directory authorities, except
  7086. they don't serve a list of known bridges. Therefore users that know
  7087. a bridge's fingerprint can fetch a relay descriptor for that bridge,
  7088. including fetching updates e.g. if the bridge changes IP address,
  7089. yet an attacker can't just fetch a list of all the bridges.
  7090. - Set up Tonga as the default bridge directory authority.
  7091. - Bridge authorities refuse to serve bridge descriptors or other
  7092. bridge information over unencrypted connections (that is, when
  7093. responding to direct DirPort requests rather than begin_dir cells.)
  7094. - Bridge directory authorities do reachability testing on the
  7095. bridges they know. They provide router status summaries to the
  7096. controller via "getinfo ns/purpose/bridge", and also dump summaries
  7097. to a file periodically, so we can keep internal stats about which
  7098. bridges are functioning.
  7099. - If bridge users set the UpdateBridgesFromAuthority config option,
  7100. but the digest they ask for is a 404 on the bridge authority,
  7101. they fall back to contacting the bridge directly.
  7102. - Bridges always use begin_dir to publish their server descriptor to
  7103. the bridge authority using an anonymous encrypted tunnel.
  7104. - Early work on a "bridge community" design: if bridge authorities set
  7105. the BridgePassword config option, they will serve a snapshot of
  7106. known bridge routerstatuses from their DirPort to anybody who
  7107. knows that password. Unset by default.
  7108. - Tor now includes an IP-to-country GeoIP file, so bridge relays can
  7109. report sanitized aggregated summaries in their extra-info documents
  7110. privately to the bridge authority, listing which countries are
  7111. able to reach them. We hope this mechanism will let us learn when
  7112. certain countries start trying to block bridges.
  7113. - Bridge authorities write bridge descriptors to disk, so they can
  7114. reload them after a reboot. They can also export the descriptors
  7115. to other programs, so we can distribute them to blocked users via
  7116. the BridgeDB interface, e.g. via https://bridges.torproject.org/
  7117. and bridges@torproject.org.
  7118. o Tor can be a DNS proxy:
  7119. - The new client-side DNS proxy feature replaces the need for
  7120. dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
  7121. for DNS requests on port 9999, use the Tor network to resolve them
  7122. anonymously, and send the reply back like a regular DNS server.
  7123. The code still only implements a subset of DNS.
  7124. - Add a new AutomapHostsOnResolve option: when it is enabled, any
  7125. resolve request for hosts matching a given pattern causes Tor to
  7126. generate an internal virtual address mapping for that host. This
  7127. allows DNSPort to work sensibly with hidden service users. By
  7128. default, .exit and .onion addresses are remapped; the list of
  7129. patterns can be reconfigured with AutomapHostsSuffixes.
  7130. - Add an "-F" option to tor-resolve to force a resolve for a .onion
  7131. address. Thanks to the AutomapHostsOnResolve option, this is no
  7132. longer a completely silly thing to do.
  7133. o Major features (relay usability):
  7134. - New config options RelayBandwidthRate and RelayBandwidthBurst:
  7135. a separate set of token buckets for relayed traffic. Right now
  7136. relayed traffic is defined as answers to directory requests, and
  7137. OR connections that don't have any local circuits on them. See
  7138. proposal 111 for details.
  7139. - Create listener connections before we setuid to the configured
  7140. User and Group. Now non-Windows users can choose port values
  7141. under 1024, start Tor as root, and have Tor bind those ports
  7142. before it changes to another UID. (Windows users could already
  7143. pick these ports.)
  7144. - Added a new ConstrainedSockets config option to set SO_SNDBUF and
  7145. SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
  7146. on "vserver" accounts. Patch from coderman.
  7147. o Major features (directory authorities):
  7148. - Directory authorities track weighted fractional uptime and weighted
  7149. mean-time-between failures for relays. WFU is suitable for deciding
  7150. whether a node is "usually up", while MTBF is suitable for deciding
  7151. whether a node is "likely to stay up." We need both, because
  7152. "usually up" is a good requirement for guards, while "likely to
  7153. stay up" is a good requirement for long-lived connections.
  7154. - Directory authorities use a new formula for selecting which relays
  7155. to advertise as Guards: they must be in the top 7/8 in terms of
  7156. how long we have known about them, and above the median of those
  7157. nodes in terms of weighted fractional uptime.
  7158. - Directory authorities use a new formula for selecting which relays
  7159. to advertise as Stable: when we have 4 or more days of data, use
  7160. median measured MTBF rather than median declared uptime. Implements
  7161. proposal 108.
  7162. - Directory authorities accept and serve "extra info" documents for
  7163. routers. Routers now publish their bandwidth-history lines in the
  7164. extra-info docs rather than the main descriptor. This step saves
  7165. 60% (!) on compressed router descriptor downloads. Servers upload
  7166. extra-info docs to any authority that accepts them; directory
  7167. authorities now allow multiple router descriptors and/or extra
  7168. info documents to be uploaded in a single go. Authorities, and
  7169. caches that have been configured to download extra-info documents,
  7170. download them as needed. Implements proposal 104.
  7171. - Authorities now list relays who have the same nickname as
  7172. a different named relay, but list them with a new flag:
  7173. "Unnamed". Now we can make use of relays that happen to pick the
  7174. same nickname as a server that registered two years ago and then
  7175. disappeared. Implements proposal 122.
  7176. - Store routers in a file called cached-descriptors instead of in
  7177. cached-routers. Initialize cached-descriptors from cached-routers
  7178. if the old format is around. The new format allows us to store
  7179. annotations along with descriptors, to record the time we received
  7180. each descriptor, its source, and its purpose: currently one of
  7181. general, controller, or bridge.
  7182. o Major features (other):
  7183. - New config options WarnPlaintextPorts and RejectPlaintextPorts so
  7184. Tor can warn and/or refuse connections to ports commonly used with
  7185. vulnerable-plaintext protocols. Currently we warn on ports 23,
  7186. 109, 110, and 143, but we don't reject any. Based on proposal 129
  7187. by Kevin Bauer and Damon McCoy.
  7188. - Integrate Karsten Loesing's Google Summer of Code project to publish
  7189. hidden service descriptors on a set of redundant relays that are a
  7190. function of the hidden service address. Now we don't have to rely
  7191. on three central hidden service authorities for publishing and
  7192. fetching every hidden service descriptor. Implements proposal 114.
  7193. - Allow tunnelled directory connections to ask for an encrypted
  7194. "begin_dir" connection or an anonymized "uses a full Tor circuit"
  7195. connection independently. Now we can make anonymized begin_dir
  7196. connections for (e.g.) more secure hidden service posting and
  7197. fetching.
  7198. o Major bugfixes (crashes and assert failures):
  7199. - Stop imposing an arbitrary maximum on the number of file descriptors
  7200. used for busy servers. Bug reported by Olaf Selke; patch from
  7201. Sebastian Hahn.
  7202. - Avoid possible failures when generating a directory with routers
  7203. with over-long versions strings, or too many flags set.
  7204. - Fix a rare assert error when we're closing one of our threads:
  7205. use a mutex to protect the list of logs, so we never write to the
  7206. list as it's being freed. Fixes the very rare bug 575, which is
  7207. kind of the revenge of bug 222.
  7208. - Avoid segfault in the case where a badly behaved v2 versioning
  7209. directory sends a signed networkstatus with missing client-versions.
  7210. - When we hit an EOF on a log (probably because we're shutting down),
  7211. don't try to remove the log from the list: just mark it as
  7212. unusable. (Bulletproofs against bug 222.)
  7213. o Major bugfixes (code security fixes):
  7214. - Detect size overflow in zlib code. Reported by Justin Ferguson and
  7215. Dan Kaminsky.
  7216. - Rewrite directory tokenization code to never run off the end of
  7217. a string. Fixes bug 455. Patch from croup.
  7218. - Be more paranoid about overwriting sensitive memory on free(),
  7219. as a defensive programming tactic to ensure forward secrecy.
  7220. o Major bugfixes (anonymity fixes):
  7221. - Reject requests for reverse-dns lookup of names that are in
  7222. a private address space. Patch from lodger.
  7223. - Never report that we've used more bandwidth than we're willing to
  7224. relay: it leaks how much non-relay traffic we're using. Resolves
  7225. bug 516.
  7226. - As a client, do not believe any server that tells us that an
  7227. address maps to an internal address space.
  7228. - Warn about unsafe ControlPort configurations.
  7229. - Directory authorities now call routers Fast if their bandwidth is
  7230. at least 100KB/s, and consider their bandwidth adequate to be a
  7231. Guard if it is at least 250KB/s, no matter the medians. This fix
  7232. complements proposal 107.
  7233. - Directory authorities now never mark more than 2 servers per IP as
  7234. Valid and Running (or 5 on addresses shared by authorities).
  7235. Implements proposal 109, by Kevin Bauer and Damon McCoy.
  7236. - If we're a relay, avoid picking ourselves as an introduction point,
  7237. a rendezvous point, or as the final hop for internal circuits. Bug
  7238. reported by taranis and lodger.
  7239. - Exit relays that are used as a client can now reach themselves
  7240. using the .exit notation, rather than just launching an infinite
  7241. pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
  7242. - Fix a bug where, when we were choosing the 'end stream reason' to
  7243. put in our relay end cell that we send to the exit relay, Tor
  7244. clients on Windows were sometimes sending the wrong 'reason'. The
  7245. anonymity problem is that exit relays may be able to guess whether
  7246. the client is running Windows, thus helping partition the anonymity
  7247. set. Down the road we should stop sending reasons to exit relays,
  7248. or otherwise prevent future versions of this bug.
  7249. - Only update guard status (usable / not usable) once we have
  7250. enough directory information. This was causing us to discard all our
  7251. guards on startup if we hadn't been running for a few weeks. Fixes
  7252. bug 448.
  7253. - When our directory information has been expired for a while, stop
  7254. being willing to build circuits using it. Fixes bug 401.
  7255. o Major bugfixes (peace of mind for relay operators)
  7256. - Non-exit relays no longer answer "resolve" relay cells, so they
  7257. can't be induced to do arbitrary DNS requests. (Tor clients already
  7258. avoid using non-exit relays for resolve cells, but now servers
  7259. enforce this too.) Fixes bug 619. Patch from lodger.
  7260. - When we setconf ClientOnly to 1, close any current OR and Dir
  7261. listeners. Reported by mwenge.
  7262. o Major bugfixes (other):
  7263. - If we only ever used Tor for hidden service lookups or posts, we
  7264. would stop building circuits and start refusing connections after
  7265. 24 hours, since we falsely believed that Tor was dormant. Reported
  7266. by nwf.
  7267. - Add a new __HashedControlSessionPassword option for controllers
  7268. to use for one-off session password hashes that shouldn't get
  7269. saved to disk by SAVECONF --- Vidalia users were accumulating a
  7270. pile of HashedControlPassword lines in their torrc files, one for
  7271. each time they had restarted Tor and then clicked Save. Make Tor
  7272. automatically convert "HashedControlPassword" to this new option but
  7273. only when it's given on the command line. Partial fix for bug 586.
  7274. - Patch from "Andrew S. Lists" to catch when we contact a directory
  7275. mirror at IP address X and he says we look like we're coming from
  7276. IP address X. Otherwise this would screw up our address detection.
  7277. - Reject uploaded descriptors and extrainfo documents if they're
  7278. huge. Otherwise we'll cache them all over the network and it'll
  7279. clog everything up. Suggested by Aljosha Judmayer.
  7280. - When a hidden service was trying to establish an introduction point,
  7281. and Tor *did* manage to reuse one of the preemptively built
  7282. circuits, it didn't correctly remember which one it used,
  7283. so it asked for another one soon after, until there were no
  7284. more preemptive circuits, at which point it launched one from
  7285. scratch. Bugfix on 0.0.9.x.
  7286. o Rate limiting and load balancing improvements:
  7287. - When we add data to a write buffer in response to the data on that
  7288. write buffer getting low because of a flush, do not consider the
  7289. newly added data as a candidate for immediate flushing, but rather
  7290. make it wait until the next round of writing. Otherwise, we flush
  7291. and refill recursively, and a single greedy TLS connection can
  7292. eat all of our bandwidth.
  7293. - When counting the number of bytes written on a TLS connection,
  7294. look at the BIO actually used for writing to the network, not
  7295. at the BIO used (sometimes) to buffer data for the network.
  7296. Looking at different BIOs could result in write counts on the
  7297. order of ULONG_MAX. Fixes bug 614.
  7298. - If we change our MaxAdvertisedBandwidth and then reload torrc,
  7299. Tor won't realize it should publish a new relay descriptor. Fixes
  7300. bug 688, reported by mfr.
  7301. - Avoid using too little bandwidth when our clock skips a few seconds.
  7302. - Choose which bridge to use proportional to its advertised bandwidth,
  7303. rather than uniformly at random. This should speed up Tor for
  7304. bridge users. Also do this for people who set StrictEntryNodes.
  7305. o Bootstrapping faster and building circuits more intelligently:
  7306. - Fix bug 660 that was preventing us from knowing that we should
  7307. preemptively build circuits to handle expected directory requests.
  7308. - When we're checking if we have enough dir info for each relay
  7309. to begin establishing circuits, make sure that we actually have
  7310. the descriptor listed in the consensus, not just any descriptor.
  7311. - Correctly notify one-hop connections when a circuit build has
  7312. failed. Possible fix for bug 669. Found by lodger.
  7313. - Clients now hold circuitless TLS connections open for 1.5 times
  7314. MaxCircuitDirtiness (15 minutes), since it is likely that they'll
  7315. rebuild a new circuit over them within that timeframe. Previously,
  7316. they held them open only for KeepalivePeriod (5 minutes).
  7317. o Performance improvements (memory):
  7318. - Add OpenBSD malloc code from "phk" as an optional malloc
  7319. replacement on Linux: some glibc libraries do very poorly with
  7320. Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
  7321. ./configure to get the replacement malloc code.
  7322. - Switch our old ring buffer implementation for one more like that
  7323. used by free Unix kernels. The wasted space in a buffer with 1mb
  7324. of data will now be more like 8k than 1mb. The new implementation
  7325. also avoids realloc();realloc(); patterns that can contribute to
  7326. memory fragmentation.
  7327. - Change the way that Tor buffers data that it is waiting to write.
  7328. Instead of queueing data cells in an enormous ring buffer for each
  7329. client->OR or OR->OR connection, we now queue cells on a separate
  7330. queue for each circuit. This lets us use less slack memory, and
  7331. will eventually let us be smarter about prioritizing different kinds
  7332. of traffic.
  7333. - Reference-count and share copies of address policy entries; only 5%
  7334. of them were actually distinct.
  7335. - Tune parameters for cell pool allocation to minimize amount of
  7336. RAM overhead used.
  7337. - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
  7338. for every single inactive connection_t. Free items from the
  7339. 4k/16k-buffer free lists when they haven't been used for a while.
  7340. - Make memory debugging information describe more about history
  7341. of cell allocation, so we can help reduce our memory use.
  7342. - Be even more aggressive about releasing RAM from small
  7343. empty buffers. Thanks to our free-list code, this shouldn't be too
  7344. performance-intensive.
  7345. - Log malloc statistics from mallinfo() on platforms where it exists.
  7346. - Use memory pools to allocate cells with better speed and memory
  7347. efficiency, especially on platforms where malloc() is inefficient.
  7348. - Add a --with-tcmalloc option to the configure script to link
  7349. against tcmalloc (if present). Does not yet search for non-system
  7350. include paths.
  7351. o Performance improvements (socket management):
  7352. - Count the number of open sockets separately from the number of
  7353. active connection_t objects. This will let us avoid underusing
  7354. our allocated connection limit.
  7355. - We no longer use socket pairs to link an edge connection to an
  7356. anonymous directory connection or a DirPort test connection.
  7357. Instead, we track the link internally and transfer the data
  7358. in-process. This saves two sockets per "linked" connection (at the
  7359. client and at the server), and avoids the nasty Windows socketpair()
  7360. workaround.
  7361. - We were leaking a file descriptor if Tor started with a zero-length
  7362. cached-descriptors file. Patch by "freddy77".
  7363. o Performance improvements (CPU use):
  7364. - Never walk through the list of logs if we know that no log target
  7365. is interested in a given message.
  7366. - Call routerlist_remove_old_routers() much less often. This should
  7367. speed startup, especially on directory caches.
  7368. - Base64 decoding was actually showing up on our profile when parsing
  7369. the initial descriptor file; switch to an in-process all-at-once
  7370. implementation that's about 3.5x times faster than calling out to
  7371. OpenSSL.
  7372. - Use a slightly simpler string hashing algorithm (copying Python's
  7373. instead of Java's) and optimize our digest hashing algorithm to take
  7374. advantage of 64-bit platforms and to remove some possibly-costly
  7375. voodoo.
  7376. - When implementing AES counter mode, update only the portions of the
  7377. counter buffer that need to change, and don't keep separate
  7378. network-order and host-order counters on big-endian hosts (where
  7379. they are the same).
  7380. - Add an in-place version of aes_crypt() so that we can avoid doing a
  7381. needless memcpy() call on each cell payload.
  7382. - Use Critical Sections rather than Mutexes for synchronizing threads
  7383. on win32; Mutexes are heavier-weight, and designed for synchronizing
  7384. between processes.
  7385. o Performance improvements (bandwidth use):
  7386. - Don't try to launch new descriptor downloads quite so often when we
  7387. already have enough directory information to build circuits.
  7388. - Version 1 directories are no longer generated in full. Instead,
  7389. authorities generate and serve "stub" v1 directories that list
  7390. no servers. This will stop Tor versions 0.1.0.x and earlier from
  7391. working, but (for security reasons) nobody should be running those
  7392. versions anyway.
  7393. - Avoid going directly to the directory authorities even if you're a
  7394. relay, if you haven't found yourself reachable yet or if you've
  7395. decided not to advertise your dirport yet. Addresses bug 556.
  7396. - If we've gone 12 hours since our last bandwidth check, and we
  7397. estimate we have less than 50KB bandwidth capacity but we could
  7398. handle more, do another bandwidth test.
  7399. - Support "If-Modified-Since" when answering HTTP requests for
  7400. directories, running-routers documents, and v2 and v3 networkstatus
  7401. documents. (There's no need to support it for router descriptors,
  7402. since those are downloaded by descriptor digest.)
  7403. - Stop fetching directory info so aggressively if your DirPort is
  7404. on but your ORPort is off; stop fetching v2 dir info entirely.
  7405. You can override these choices with the new FetchDirInfoEarly
  7406. config option.
  7407. o Changed config option behavior (features):
  7408. - Configuration files now accept C-style strings as values. This
  7409. helps encode characters not allowed in the current configuration
  7410. file format, such as newline or #. Addresses bug 557.
  7411. - Add hidden services and DNSPorts to the list of things that make
  7412. Tor accept that it has running ports. Change starting Tor with no
  7413. ports from a fatal error to a warning; we might change it back if
  7414. this turns out to confuse anybody. Fixes bug 579.
  7415. - Make PublishServerDescriptor default to 1, so the default doesn't
  7416. have to change as we invent new directory protocol versions.
  7417. - Allow people to say PreferTunnelledDirConns rather than
  7418. PreferTunneledDirConns, for those alternate-spellers out there.
  7419. - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
  7420. accommodate the growing number of servers that use the default
  7421. and are reaching it.
  7422. - Make it possible to enable HashedControlPassword and
  7423. CookieAuthentication at the same time.
  7424. - When a TrackHostExits-chosen exit fails too many times in a row,
  7425. stop using it. Fixes bug 437.
  7426. o Changed config option behavior (bugfixes):
  7427. - Do not read the configuration file when we've only been told to
  7428. generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
  7429. based on patch from Sebastian Hahn.
  7430. - Actually validate the options passed to AuthDirReject,
  7431. AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
  7432. - Make "ClientOnly 1" config option disable directory ports too.
  7433. - Don't stop fetching descriptors when FetchUselessDescriptors is
  7434. set, even if we stop asking for circuits. Bug reported by tup
  7435. and ioerror.
  7436. - Servers used to decline to publish their DirPort if their
  7437. BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
  7438. they look only at BandwidthRate and RelayBandwidthRate.
  7439. - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
  7440. minus 1 byte: the actual maximum declared bandwidth.
  7441. - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
  7442. - Make the NodeFamilies config option work. (Reported by
  7443. lodger -- it has never actually worked, even though we added it
  7444. in Oct 2004.)
  7445. - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
  7446. now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
  7447. o New config options:
  7448. - New configuration options AuthDirMaxServersPerAddr and
  7449. AuthDirMaxServersperAuthAddr to override default maximum number
  7450. of servers allowed on a single IP address. This is important for
  7451. running a test network on a single host.
  7452. - Three new config options (AlternateDirAuthority,
  7453. AlternateBridgeAuthority, and AlternateHSAuthority) that let the
  7454. user selectively replace the default directory authorities by type,
  7455. rather than the all-or-nothing replacement that DirServer offers.
  7456. - New config options AuthDirBadDir and AuthDirListBadDirs for
  7457. authorities to mark certain relays as "bad directories" in the
  7458. networkstatus documents. Also supports the "!baddir" directive in
  7459. the approved-routers file.
  7460. - New config option V2AuthoritativeDirectory that all v2 directory
  7461. authorities must set. This lets v3 authorities choose not to serve
  7462. v2 directory information.
  7463. o Minor features (other):
  7464. - When we're not serving v2 directory information, there is no reason
  7465. to actually keep any around. Remove the obsolete files and directory
  7466. on startup if they are very old and we aren't going to serve them.
  7467. - When we negotiate a v2 link-layer connection (not yet implemented),
  7468. accept RELAY_EARLY cells and turn them into RELAY cells if we've
  7469. negotiated a v1 connection for their next step. Initial steps for
  7470. proposal 110.
  7471. - When we have no consensus, check FallbackNetworkstatusFile (defaults
  7472. to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
  7473. we can start out knowing some directory caches. We don't ship with
  7474. a fallback consensus by default though, because it was making
  7475. bootstrapping take too long while we tried many down relays.
  7476. - Authorities send back an X-Descriptor-Not-New header in response to
  7477. an accepted-but-discarded descriptor upload. Partially implements
  7478. fix for bug 535.
  7479. - If we find a cached-routers file that's been sitting around for more
  7480. than 28 days unmodified, then most likely it's a leftover from
  7481. when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
  7482. routers anyway.
  7483. - When we (as a cache) download a descriptor because it was listed
  7484. in a consensus, remember when the consensus was supposed to expire,
  7485. and don't expire the descriptor until then.
  7486. - Optionally (if built with -DEXPORTMALLINFO) export the output
  7487. of mallinfo via http, as tor/mallinfo.txt. Only accessible
  7488. from localhost.
  7489. - Tag every guard node in our state file with the version that
  7490. we believe added it, or with our own version if we add it. This way,
  7491. if a user temporarily runs an old version of Tor and then switches
  7492. back to a new one, she doesn't automatically lose her guards.
  7493. - When somebody requests a list of statuses or servers, and we have
  7494. none of those, return a 404 rather than an empty 200.
  7495. - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
  7496. from croup.)
  7497. - Add an HSAuthorityRecordStats option that hidden service authorities
  7498. can use to track statistics of overall hidden service usage without
  7499. logging information that would be as useful to an attacker.
  7500. - Allow multiple HiddenServicePort directives with the same virtual
  7501. port; when they occur, the user is sent round-robin to one
  7502. of the target ports chosen at random. Partially fixes bug 393 by
  7503. adding limited ad-hoc round-robining.
  7504. - Revamp file-writing logic so we don't need to have the entire
  7505. contents of a file in memory at once before we write to disk. Tor,
  7506. meet stdio.
  7507. o Minor bugfixes (other):
  7508. - Alter the code that tries to recover from unhandled write
  7509. errors, to not try to flush onto a socket that's given us
  7510. unhandled errors.
  7511. - Directory mirrors no longer include a guess at the client's IP
  7512. address if the connection appears to be coming from the same /24
  7513. network; it was producing too many wrong guesses.
  7514. - If we're trying to flush the last bytes on a connection (for
  7515. example, when answering a directory request), reset the
  7516. time-to-give-up timeout every time we manage to write something
  7517. on the socket.
  7518. - Reject router descriptors with out-of-range bandwidthcapacity or
  7519. bandwidthburst values.
  7520. - If we can't expand our list of entry guards (e.g. because we're
  7521. using bridges or we have StrictEntryNodes set), don't mark relays
  7522. down when they fail a directory request. Otherwise we're too quick
  7523. to mark all our entry points down.
  7524. - Authorities no longer send back "400 you're unreachable please fix
  7525. it" errors to Tor servers that aren't online all the time. We're
  7526. supposed to tolerate these servers now.
  7527. - Let directory authorities startup even when they can't generate
  7528. a descriptor immediately, e.g. because they don't know their
  7529. address.
  7530. - Correctly enforce that elements of directory objects do not appear
  7531. more often than they are allowed to appear.
  7532. - Stop allowing hibernating servers to be "stable" or "fast".
  7533. - On Windows, we were preventing other processes from reading
  7534. cached-routers while Tor was running. (Reported by janbar)
  7535. - Check return values from pthread_mutex functions.
  7536. - When opening /dev/null in finish_daemonize(), do not pass the
  7537. O_CREAT flag. Fortify was complaining, and correctly so. Fixes
  7538. bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
  7539. o Controller features:
  7540. - The GETCONF command now escapes and quotes configuration values
  7541. that don't otherwise fit into the torrc file.
  7542. - The SETCONF command now handles quoted values correctly.
  7543. - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
  7544. ask about source, timestamp of arrival, purpose, etc. We need
  7545. something like this to help Vidalia not do GeoIP lookups on bridge
  7546. addresses.
  7547. - Allow multiple HashedControlPassword config lines, to support
  7548. multiple controller passwords.
  7549. - Accept LF instead of CRLF on controller, since some software has a
  7550. hard time generating real Internet newlines.
  7551. - Add GETINFO values for the server status events
  7552. "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
  7553. Robert Hogan.
  7554. - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
  7555. GETINFO for Torstat to use until it can switch to using extrainfos.
  7556. - New config option CookieAuthFile to choose a new location for the
  7557. cookie authentication file, and config option
  7558. CookieAuthFileGroupReadable to make it group-readable.
  7559. - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
  7560. match requests to applications. Patch from Robert Hogan.
  7561. - Add a RESOLVE command to launch hostname lookups. Original patch
  7562. from Robert Hogan.
  7563. - Add GETINFO status/enough-dir-info to let controllers tell whether
  7564. Tor has downloaded sufficient directory information. Patch from Tup.
  7565. - You can now use the ControlSocket option to tell Tor to listen for
  7566. controller connections on Unix domain sockets on systems that
  7567. support them. Patch from Peter Palfrader.
  7568. - New "GETINFO address-mappings/*" command to get address mappings
  7569. with expiry information. "addr-mappings/*" is now deprecated.
  7570. Patch from Tup.
  7571. - Add a new config option __DisablePredictedCircuits designed for
  7572. use by the controller, when we don't want Tor to build any circuits
  7573. preemptively.
  7574. - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
  7575. so we can exit from the middle of the circuit.
  7576. - Implement "getinfo status/circuit-established".
  7577. - Implement "getinfo status/version/..." so a controller can tell
  7578. whether the current version is recommended, and whether any versions
  7579. are good, and how many authorities agree. Patch from "shibz".
  7580. - Controllers should now specify cache=no or cache=yes when using
  7581. the +POSTDESCRIPTOR command.
  7582. - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
  7583. Robert Hogan. Fixes the first part of bug 681.
  7584. - When reporting clock skew, and we know that the clock is _at least
  7585. as skewed_ as some value, but we don't know the actual value,
  7586. report the value as a "minimum skew."
  7587. o Controller bugfixes:
  7588. - Generate "STATUS_SERVER" events rather than misspelled
  7589. "STATUS_SEVER" events. Caught by mwenge.
  7590. - Reject controller commands over 1MB in length, so rogue
  7591. processes can't run us out of memory.
  7592. - Change the behavior of "getinfo status/good-server-descriptor"
  7593. so it doesn't return failure when any authority disappears.
  7594. - Send NAMESERVER_STATUS messages for a single failed nameserver
  7595. correctly.
  7596. - When the DANGEROUS_VERSION controller status event told us we're
  7597. running an obsolete version, it used the string "OLD" to describe
  7598. it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
  7599. "OBSOLETE" in both cases.
  7600. - Respond to INT and TERM SIGNAL commands before we execute the
  7601. signal, in case the signal shuts us down. We had a patch in
  7602. 0.1.2.1-alpha that tried to do this by queueing the response on
  7603. the connection's buffer before shutting down, but that really
  7604. isn't the same thing at all. Bug located by Matt Edman.
  7605. - Provide DNS expiry times in GMT, not in local time. For backward
  7606. compatibility, ADDRMAP events only provide GMT expiry in an extended
  7607. field. "GETINFO address-mappings" always does the right thing.
  7608. - Use CRLF line endings properly in NS events.
  7609. - Make 'getinfo fingerprint' return a 551 error if we're not a
  7610. server, so we match what the control spec claims we do. Reported
  7611. by daejees.
  7612. - Fix a typo in an error message when extendcircuit fails that
  7613. caused us to not follow the \r\n-based delimiter protocol. Reported
  7614. by daejees.
  7615. - When tunneling an encrypted directory connection, and its first
  7616. circuit fails, do not leave it unattached and ask the controller
  7617. to deal. Fixes the second part of bug 681.
  7618. - Treat some 403 responses from directory servers as INFO rather than
  7619. WARN-severity events.
  7620. o Portability / building / compiling:
  7621. - When building with --enable-gcc-warnings, check for whether Apple's
  7622. warning "-Wshorten-64-to-32" is available.
  7623. - Support compilation to target iPhone; patch from cjacker huang.
  7624. To build for iPhone, pass the --enable-iphone option to configure.
  7625. - Port Tor to build and run correctly on Windows CE systems, using
  7626. the wcecompat library. Contributed by Valerio Lupi.
  7627. - Detect non-ASCII platforms (if any still exist) and refuse to
  7628. build there: some of our code assumes that 'A' is 65 and so on.
  7629. - Clear up some MIPSPro compiler warnings.
  7630. - Make autoconf search for libevent, openssl, and zlib consistently.
  7631. - Update deprecated macros in configure.in.
  7632. - When warning about missing headers, tell the user to let us
  7633. know if the compile succeeds anyway, so we can downgrade the
  7634. warning.
  7635. - Include the current subversion revision as part of the version
  7636. string: either fetch it directly if we're in an SVN checkout, do
  7637. some magic to guess it if we're in an SVK checkout, or use
  7638. the last-detected version if we're building from a .tar.gz.
  7639. Use this version consistently in log messages.
  7640. - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
  7641. - Read resolv.conf files correctly on platforms where read() returns
  7642. partial results on small file reads.
  7643. - Build without verbose warnings even on gcc 4.2 and 4.3.
  7644. - On Windows, correctly detect errors when listing the contents of
  7645. a directory. Fix from lodger.
  7646. - Run 'make test' as part of 'make dist', so we stop releasing so
  7647. many development snapshots that fail their unit tests.
  7648. - Add support to detect Libevent versions in the 1.4.x series
  7649. on mingw.
  7650. - Add command-line arguments to unit-test executable so that we can
  7651. invoke any chosen test from the command line rather than having
  7652. to run the whole test suite at once; and so that we can turn on
  7653. logging for the unit tests.
  7654. - Do not automatically run configure from autogen.sh. This
  7655. non-standard behavior tended to annoy people who have built other
  7656. programs.
  7657. - Fix a macro/CPP interaction that was confusing some compilers:
  7658. some GCCs don't like #if/#endif pairs inside macro arguments.
  7659. Fixes bug 707.
  7660. - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
  7661. Fixes bug 704; fix from Steven Murdoch.
  7662. - Correctly detect transparent proxy support on Linux hosts that
  7663. require in.h to be included before netfilter_ipv4.h. Patch
  7664. from coderman.
  7665. o Logging improvements:
  7666. - When we haven't had any application requests lately, don't bother
  7667. logging that we have expired a bunch of descriptors.
  7668. - When attempting to open a logfile fails, tell us why.
  7669. - Only log guard node status when guard node status has changed.
  7670. - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
  7671. make "INFO" 75% less verbose.
  7672. - When SafeLogging is disabled, log addresses along with all TLS
  7673. errors.
  7674. - Report TLS "zero return" case as a "clean close" and "IO error"
  7675. as a "close". Stop calling closes "unexpected closes": existing
  7676. Tors don't use SSL_close(), so having a connection close without
  7677. the TLS shutdown handshake is hardly unexpected.
  7678. - When we receive a consensus from the future, warn about skew.
  7679. - Make "not enough dir info yet" warnings describe *why* Tor feels
  7680. it doesn't have enough directory info yet.
  7681. - On the USR1 signal, when dmalloc is in use, log the top 10 memory
  7682. consumers. (We already do this on HUP.)
  7683. - Give more descriptive well-formedness errors for out-of-range
  7684. hidden service descriptor/protocol versions.
  7685. - Stop recommending that every server operator send mail to tor-ops.
  7686. Resolves bug 597. Bugfix on 0.1.2.x.
  7687. - Improve skew reporting: try to give the user a better log message
  7688. about how skewed they are, and how much this matters.
  7689. - New --quiet command-line option to suppress the default console log.
  7690. Good in combination with --hash-password.
  7691. - Don't complain that "your server has not managed to confirm that its
  7692. ports are reachable" if we haven't been able to build any circuits
  7693. yet.
  7694. - Detect the reason for failing to mmap a descriptor file we just
  7695. wrote, and give a more useful log message. Fixes bug 533.
  7696. - Always prepend "Bug: " to any log message about a bug.
  7697. - When dumping memory usage, list bytes used in buffer memory
  7698. free-lists.
  7699. - When running with dmalloc, dump more stats on hup and on exit.
  7700. - Put a platform string (e.g. "Linux i686") in the startup log
  7701. message, so when people paste just their logs, we know if it's
  7702. OpenBSD or Windows or what.
  7703. - When logging memory usage, break down memory used in buffers by
  7704. buffer type.
  7705. - When we are reporting the DirServer line we just parsed, we were
  7706. logging the second stanza of the key fingerprint, not the first.
  7707. - Even though Windows is equally happy with / and \ as path separators,
  7708. try to use \ consistently on Windows and / consistently on Unix: it
  7709. makes the log messages nicer.
  7710. - On OSX, stop warning the user that kqueue support in libevent is
  7711. "experimental", since it seems to have worked fine for ages.
  7712. o Contributed scripts and tools:
  7713. - Update linux-tor-prio.sh script to allow QoS based on the uid of
  7714. the Tor process. Patch from Marco Bonetti with tweaks from Mike
  7715. Perry.
  7716. - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
  7717. Unix users an easy way to script their Tor process (e.g. by
  7718. adjusting bandwidth based on the time of the day).
  7719. - In the exitlist script, only consider the most recently published
  7720. server descriptor for each server. Also, when the user requests
  7721. a list of servers that _reject_ connections to a given address,
  7722. explicitly exclude the IPs that also have servers that accept
  7723. connections to that address. Resolves bug 405.
  7724. - Include a new contrib/tor-exit-notice.html file that exit relay
  7725. operators can put on their website to help reduce abuse queries.
  7726. o Newly deprecated features:
  7727. - The status/version/num-versioning and status/version/num-concurring
  7728. GETINFO controller options are no longer useful in the v3 directory
  7729. protocol: treat them as deprecated, and warn when they're used.
  7730. - The RedirectExits config option is now deprecated.
  7731. o Removed features:
  7732. - Drop the old code to choke directory connections when the
  7733. corresponding OR connections got full: thanks to the cell queue
  7734. feature, OR conns don't get full any more.
  7735. - Remove the old "dns worker" server DNS code: it hasn't been default
  7736. since 0.1.2.2-alpha, and all the servers are using the new
  7737. eventdns code.
  7738. - Remove the code to generate the oldest (v1) directory format.
  7739. - Remove support for the old bw_accounting file: we've been storing
  7740. bandwidth accounting information in the state file since
  7741. 0.1.2.5-alpha. This may result in bandwidth accounting errors
  7742. if you try to upgrade from 0.1.1.x or earlier, or if you try to
  7743. downgrade to 0.1.1.x or earlier.
  7744. - Drop support for OpenSSL version 0.9.6. Just about nobody was using
  7745. it, it had no AES, and it hasn't seen any security patches since
  7746. 2004.
  7747. - Stop overloading the circuit_t.onionskin field for both "onionskin
  7748. from a CREATE cell that we are waiting for a cpuworker to be
  7749. assigned" and "onionskin from an EXTEND cell that we are going to
  7750. send to an OR as soon as we are connected". Might help with bug 600.
  7751. - Remove the tor_strpartition() function: its logic was confused,
  7752. and it was only used for one thing that could be implemented far
  7753. more easily.
  7754. - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
  7755. and TorControl.py, as they use the old v0 controller protocol,
  7756. and are obsoleted by TorFlow anyway.
  7757. - Drop support for v1 rendezvous descriptors, since we never used
  7758. them anyway, and the code has probably rotted by now. Based on
  7759. patch from Karsten Loesing.
  7760. - Stop allowing address masks that do not correspond to bit prefixes.
  7761. We have warned about these for a really long time; now it's time
  7762. to reject them. (Patch from croup.)
  7763. - Remove an optimization in the AES counter-mode code that assumed
  7764. that the counter never exceeded 2^68. When the counter can be set
  7765. arbitrarily as an IV (as it is by Karsten's new hidden services
  7766. code), this assumption no longer holds.
  7767. - Disable the SETROUTERPURPOSE controller command: it is now
  7768. obsolete.
  7769. Changes in version 0.1.2.19 - 2008-01-17
  7770. Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  7771. exit policy a little bit more conservative so it's safer to run an
  7772. exit relay on a home system, and fixes a variety of smaller issues.
  7773. o Security fixes:
  7774. - Exit policies now reject connections that are addressed to a
  7775. relay's public (external) IP address too, unless
  7776. ExitPolicyRejectPrivate is turned off. We do this because too
  7777. many relays are running nearby to services that trust them based
  7778. on network address.
  7779. o Major bugfixes:
  7780. - When the clock jumps forward a lot, do not allow the bandwidth
  7781. buckets to become negative. Fixes bug 544.
  7782. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  7783. on every successful resolve. Reported by Mike Perry.
  7784. - Purge old entries from the "rephist" database and the hidden
  7785. service descriptor database even when DirPort is zero.
  7786. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  7787. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  7788. crashing or mis-answering these requests.
  7789. - When we decide to send a 503 response to a request for servers, do
  7790. not then also send the server descriptors: this defeats the whole
  7791. purpose. Fixes bug 539.
  7792. o Minor bugfixes:
  7793. - Changing the ExitPolicyRejectPrivate setting should cause us to
  7794. rebuild our server descriptor.
  7795. - Fix handling of hex nicknames when answering controller requests for
  7796. networkstatus by name, or when deciding whether to warn about
  7797. unknown routers in a config option. (Patch from mwenge.)
  7798. - Fix a couple of hard-to-trigger autoconf problems that could result
  7799. in really weird results on platforms whose sys/types.h files define
  7800. nonstandard integer types.
  7801. - Don't try to create the datadir when running --verify-config or
  7802. --hash-password. Resolves bug 540.
  7803. - If we were having problems getting a particular descriptor from the
  7804. directory caches, and then we learned about a new descriptor for
  7805. that router, we weren't resetting our failure count. Reported
  7806. by lodger.
  7807. - Although we fixed bug 539 (where servers would send HTTP status 503
  7808. responses _and_ send a body too), there are still servers out there
  7809. that haven't upgraded. Therefore, make clients parse such bodies
  7810. when they receive them.
  7811. - Run correctly on systems where rlim_t is larger than unsigned long.
  7812. This includes some 64-bit systems.
  7813. - Run correctly on platforms (like some versions of OS X 10.5) where
  7814. the real limit for number of open files is OPEN_FILES, not rlim_max
  7815. from getrlimit(RLIMIT_NOFILES).
  7816. - Avoid a spurious free on base64 failure.
  7817. - Avoid segfaults on certain complex invocations of
  7818. router_get_by_hexdigest().
  7819. - Fix rare bug on REDIRECTSTREAM control command when called with no
  7820. port set: it could erroneously report an error when none had
  7821. happened.
  7822. Changes in version 0.1.2.18 - 2007-10-28
  7823. Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  7824. hidden service introduction that were causing huge delays, and a big
  7825. bug that was causing some servers to disappear from the network status
  7826. lists for a few hours each day.
  7827. o Major bugfixes (crashes):
  7828. - If a connection is shut down abruptly because of something that
  7829. happened inside connection_flushed_some(), do not call
  7830. connection_finished_flushing(). Should fix bug 451:
  7831. "connection_stop_writing: Assertion conn->write_event failed"
  7832. Bugfix on 0.1.2.7-alpha.
  7833. - Fix possible segfaults in functions called from
  7834. rend_process_relay_cell().
  7835. o Major bugfixes (hidden services):
  7836. - Hidden services were choosing introduction points uniquely by
  7837. hexdigest, but when constructing the hidden service descriptor
  7838. they merely wrote the (potentially ambiguous) nickname.
  7839. - Clients now use the v2 intro format for hidden service
  7840. connections: they specify their chosen rendezvous point by identity
  7841. digest rather than by (potentially ambiguous) nickname. These
  7842. changes could speed up hidden service connections dramatically.
  7843. o Major bugfixes (other):
  7844. - Stop publishing a new server descriptor just because we get a
  7845. HUP signal. This led (in a roundabout way) to some servers getting
  7846. dropped from the networkstatus lists for a few hours each day.
  7847. - When looking for a circuit to cannibalize, consider family as well
  7848. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  7849. circuit cannibalization).
  7850. - When a router wasn't listed in a new networkstatus, we were leaving
  7851. the flags for that router alone -- meaning it remained Named,
  7852. Running, etc -- even though absence from the networkstatus means
  7853. that it shouldn't be considered to exist at all anymore. Now we
  7854. clear all the flags for routers that fall out of the networkstatus
  7855. consensus. Fixes bug 529.
  7856. o Minor bugfixes:
  7857. - Don't try to access (or alter) the state file when running
  7858. --list-fingerprint or --verify-config or --hash-password. Resolves
  7859. bug 499.
  7860. - When generating information telling us how to extend to a given
  7861. router, do not try to include the nickname if it is
  7862. absent. Resolves bug 467.
  7863. - Fix a user-triggerable segfault in expand_filename(). (There isn't
  7864. a way to trigger this remotely.)
  7865. - When sending a status event to the controller telling it that an
  7866. OR address is reachable, set the port correctly. (Previously we
  7867. were reporting the dir port.)
  7868. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  7869. command. Bugfix on 0.1.2.17.
  7870. - When loading bandwidth history, do not believe any information in
  7871. the future. Fixes bug 434.
  7872. - When loading entry guard information, do not believe any information
  7873. in the future.
  7874. - When we have our clock set far in the future and generate an
  7875. onion key, then re-set our clock to be correct, we should not stop
  7876. the onion key from getting rotated.
  7877. - On some platforms, accept() can return a broken address. Detect
  7878. this more quietly, and deal accordingly. Fixes bug 483.
  7879. - It's not actually an error to find a non-pending entry in the DNS
  7880. cache when canceling a pending resolve. Don't log unless stuff
  7881. is fishy. Resolves bug 463.
  7882. - Don't reset trusted dir server list when we set a configuration
  7883. option. Patch from Robert Hogan.
  7884. Changes in version 0.1.2.17 - 2007-08-30
  7885. Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  7886. X bundles. Vidalia 0.0.14 makes authentication required for the
  7887. ControlPort in the default configuration, which addresses important
  7888. security risks. Everybody who uses Vidalia (or another controller)
  7889. should upgrade.
  7890. In addition, this Tor update fixes major load balancing problems with
  7891. path selection, which should speed things up a lot once many people
  7892. have upgraded.
  7893. o Major bugfixes (security):
  7894. - We removed support for the old (v0) control protocol. It has been
  7895. deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
  7896. become more of a headache than it's worth.
  7897. o Major bugfixes (load balancing):
  7898. - When choosing nodes for non-guard positions, weight guards
  7899. proportionally less, since they already have enough load. Patch
  7900. from Mike Perry.
  7901. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  7902. will allow fast Tor servers to get more attention.
  7903. - When we're upgrading from an old Tor version, forget our current
  7904. guards and pick new ones according to the new weightings. These
  7905. three load balancing patches could raise effective network capacity
  7906. by a factor of four. Thanks to Mike Perry for measurements.
  7907. o Major bugfixes (stream expiration):
  7908. - Expire not-yet-successful application streams in all cases if
  7909. they've been around longer than SocksTimeout. Right now there are
  7910. some cases where the stream will live forever, demanding a new
  7911. circuit every 15 seconds. Fixes bug 454; reported by lodger.
  7912. o Minor features (controller):
  7913. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  7914. is valid before any authentication has been received. It tells
  7915. a controller what kind of authentication is expected, and what
  7916. protocol is spoken. Implements proposal 119.
  7917. o Minor bugfixes (performance):
  7918. - Save on most routerlist_assert_ok() calls in routerlist.c, thus
  7919. greatly speeding up loading cached-routers from disk on startup.
  7920. - Disable sentinel-based debugging for buffer code: we squashed all
  7921. the bugs that this was supposed to detect a long time ago, and now
  7922. its only effect is to change our buffer sizes from nice powers of
  7923. two (which platform mallocs tend to like) to values slightly over
  7924. powers of two (which make some platform mallocs sad).
  7925. o Minor bugfixes (misc):
  7926. - If exit bandwidth ever exceeds one third of total bandwidth, then
  7927. use the correct formula to weight exit nodes when choosing paths.
  7928. Based on patch from Mike Perry.
  7929. - Choose perfectly fairly among routers when choosing by bandwidth and
  7930. weighting by fraction of bandwidth provided by exits. Previously, we
  7931. would choose with only approximate fairness, and correct ourselves
  7932. if we ran off the end of the list.
  7933. - If we require CookieAuthentication but we fail to write the
  7934. cookie file, we would warn but not exit, and end up in a state
  7935. where no controller could authenticate. Now we exit.
  7936. - If we require CookieAuthentication, stop generating a new cookie
  7937. every time we change any piece of our config.
  7938. - Refuse to start with certain directory authority keys, and
  7939. encourage people using them to stop.
  7940. - Terminate multi-line control events properly. Original patch
  7941. from tup.
  7942. - Fix a minor memory leak when we fail to find enough suitable
  7943. servers to choose a circuit.
  7944. - Stop leaking part of the descriptor when we run into a particularly
  7945. unparseable piece of it.
  7946. Changes in version 0.1.2.16 - 2007-08-01
  7947. Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  7948. remote attacker in certain situations to rewrite the user's torrc
  7949. configuration file. This can completely compromise anonymity of users
  7950. in most configurations, including those running the Vidalia bundles,
  7951. TorK, etc. Or worse.
  7952. o Major security fixes:
  7953. - Close immediately after missing authentication on control port;
  7954. do not allow multiple authentication attempts.
  7955. Changes in version 0.1.2.15 - 2007-07-17
  7956. Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  7957. problems, fixes compilation on BSD, and fixes a variety of other
  7958. bugs. Everybody should upgrade.
  7959. o Major bugfixes (compilation):
  7960. - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
  7961. o Major bugfixes (crashes):
  7962. - Try even harder not to dereference the first character after
  7963. an mmap(). Reported by lodger.
  7964. - Fix a crash bug in directory authorities when we re-number the
  7965. routerlist while inserting a new router.
  7966. - When the cached-routers file is an even multiple of the page size,
  7967. don't run off the end and crash. (Fixes bug 455; based on idea
  7968. from croup.)
  7969. - Fix eventdns.c behavior on Solaris: It is critical to include
  7970. orconfig.h _before_ sys/types.h, so that we can get the expected
  7971. definition of _FILE_OFFSET_BITS.
  7972. o Major bugfixes (security):
  7973. - Fix a possible buffer overrun when using BSD natd support. Bug
  7974. found by croup.
  7975. - When sending destroy cells from a circuit's origin, don't include
  7976. the reason for tearing down the circuit. The spec says we didn't,
  7977. and now we actually don't. Reported by lodger.
  7978. - Keep streamids from different exits on a circuit separate. This
  7979. bug may have allowed other routers on a given circuit to inject
  7980. cells into streams. Reported by lodger; fixes bug 446.
  7981. - If there's a never-before-connected-to guard node in our list,
  7982. never choose any guards past it. This way we don't expand our
  7983. guard list unless we need to.
  7984. o Minor bugfixes (guard nodes):
  7985. - Weight guard selection by bandwidth, so that low-bandwidth nodes
  7986. don't get overused as guards.
  7987. o Minor bugfixes (directory):
  7988. - Correctly count the number of authorities that recommend each
  7989. version. Previously, we were under-counting by 1.
  7990. - Fix a potential crash bug when we load many server descriptors at
  7991. once and some of them make others of them obsolete. Fixes bug 458.
  7992. o Minor bugfixes (hidden services):
  7993. - Stop tearing down the whole circuit when the user asks for a
  7994. connection to a port that the hidden service didn't configure.
  7995. Resolves bug 444.
  7996. o Minor bugfixes (misc):
  7997. - On Windows, we were preventing other processes from reading
  7998. cached-routers while Tor was running. Reported by janbar.
  7999. - Fix a possible (but very unlikely) bug in picking routers by
  8000. bandwidth. Add a log message to confirm that it is in fact
  8001. unlikely. Patch from lodger.
  8002. - Backport a couple of memory leak fixes.
  8003. - Backport miscellaneous cosmetic bugfixes.
  8004. Changes in version 0.1.2.14 - 2007-05-25
  8005. Tor 0.1.2.14 changes the addresses of two directory authorities (this
  8006. change especially affects those who serve or use hidden services),
  8007. and fixes several other crash- and security-related bugs.
  8008. o Directory authority changes:
  8009. - Two directory authorities (moria1 and moria2) just moved to new
  8010. IP addresses. This change will particularly affect those who serve
  8011. or use hidden services.
  8012. o Major bugfixes (crashes):
  8013. - If a directory server runs out of space in the connection table
  8014. as it's processing a begin_dir request, it will free the exit stream
  8015. but leave it attached to the circuit, leading to unpredictable
  8016. behavior. (Reported by seeess, fixes bug 425.)
  8017. - Fix a bug in dirserv_remove_invalid() that would cause authorities
  8018. to corrupt memory under some really unlikely scenarios.
  8019. - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
  8020. - Avoid segfaults when reading from mmaped descriptor file. (Reported
  8021. by lodger.)
  8022. o Major bugfixes (security):
  8023. - When choosing an entry guard for a circuit, avoid using guards
  8024. that are in the same family as the chosen exit -- not just guards
  8025. that are exactly the chosen exit. (Reported by lodger.)
  8026. o Major bugfixes (resource management):
  8027. - If a directory authority is down, skip it when deciding where to get
  8028. networkstatus objects or descriptors. Otherwise we keep asking
  8029. every 10 seconds forever. Fixes bug 384.
  8030. - Count it as a failure if we fetch a valid network-status but we
  8031. don't want to keep it. Otherwise we'll keep fetching it and keep
  8032. not wanting to keep it. Fixes part of bug 422.
  8033. - If all of our dirservers have given us bad or no networkstatuses
  8034. lately, then stop hammering them once per minute even when we
  8035. think they're failed. Fixes another part of bug 422.
  8036. o Minor bugfixes:
  8037. - Actually set the purpose correctly for descriptors inserted with
  8038. purpose=controller.
  8039. - When we have k non-v2 authorities in our DirServer config,
  8040. we ignored the last k authorities in the list when updating our
  8041. network-statuses.
  8042. - Correctly back-off from requesting router descriptors that we are
  8043. having a hard time downloading.
  8044. - Read resolv.conf files correctly on platforms where read() returns
  8045. partial results on small file reads.
  8046. - Don't rebuild the entire router store every time we get 32K of
  8047. routers: rebuild it when the journal gets very large, or when
  8048. the gaps in the store get very large.
  8049. o Minor features:
  8050. - When routers publish SVN revisions in their router descriptors,
  8051. authorities now include those versions correctly in networkstatus
  8052. documents.
  8053. - Warn when using a version of libevent before 1.3b to run a server on
  8054. OSX or BSD: these versions interact badly with userspace threads.
  8055. Changes in version 0.1.2.13 - 2007-04-24
  8056. This release features some major anonymity fixes, such as safer path
  8057. selection; better client performance; faster bootstrapping, better
  8058. address detection, and better DNS support for servers; write limiting as
  8059. well as read limiting to make servers easier to run; and a huge pile of
  8060. other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
  8061. Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  8062. of the Freenode IRC network, remembering his patience and vision for
  8063. free speech on the Internet.
  8064. o Major features, client performance:
  8065. - Weight directory requests by advertised bandwidth. Now we can
  8066. let servers enable write limiting but still allow most clients to
  8067. succeed at their directory requests. (We still ignore weights when
  8068. choosing a directory authority; I hope this is a feature.)
  8069. - Stop overloading exit nodes -- avoid choosing them for entry or
  8070. middle hops when the total bandwidth available from non-exit nodes
  8071. is much higher than the total bandwidth available from exit nodes.
  8072. - Rather than waiting a fixed amount of time between retrying
  8073. application connections, we wait only 10 seconds for the first,
  8074. 10 seconds for the second, and 15 seconds for each retry after
  8075. that. Hopefully this will improve the expected user experience.
  8076. - Sometimes we didn't bother sending a RELAY_END cell when an attempt
  8077. to open a stream fails; now we do in more cases. This should
  8078. make clients able to find a good exit faster in some cases, since
  8079. unhandleable requests will now get an error rather than timing out.
  8080. o Major features, client functionality:
  8081. - Implement BEGIN_DIR cells, so we can connect to a directory
  8082. server via TLS to do encrypted directory requests rather than
  8083. plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
  8084. config options if you like. For now, this feature only works if
  8085. you already have a descriptor for the destination dirserver.
  8086. - Add support for transparent application connections: this basically
  8087. bundles the functionality of trans-proxy-tor into the Tor
  8088. mainline. Now hosts with compliant pf/netfilter implementations
  8089. can redirect TCP connections straight to Tor without diverting
  8090. through SOCKS. (Based on patch from tup.)
  8091. - Add support for using natd; this allows FreeBSDs earlier than
  8092. 5.1.2 to have ipfw send connections through Tor without using
  8093. SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
  8094. o Major features, servers:
  8095. - Setting up a dyndns name for your server is now optional: servers
  8096. with no hostname or IP address will learn their IP address by
  8097. asking the directory authorities. This code only kicks in when you
  8098. would normally have exited with a "no address" error. Nothing's
  8099. authenticated, so use with care.
  8100. - Directory servers now spool server descriptors, v1 directories,
  8101. and v2 networkstatus objects to buffers as needed rather than en
  8102. masse. They also mmap the cached-routers files. These steps save
  8103. lots of memory.
  8104. - Stop requiring clients to have well-formed certificates, and stop
  8105. checking nicknames in certificates. (Clients have certificates so
  8106. that they can look like Tor servers, but in the future we might want
  8107. to allow them to look like regular TLS clients instead. Nicknames
  8108. in certificates serve no purpose other than making our protocol
  8109. easier to recognize on the wire.) Implements proposal 106.
  8110. o Improvements on DNS support:
  8111. - Add "eventdns" asynchronous dns library originally based on code
  8112. from Adam Langley. Now we can discard the old rickety dnsworker
  8113. concept, and support a wider variety of DNS functions. Allows
  8114. multithreaded builds on NetBSD and OpenBSD again.
  8115. - Add server-side support for "reverse" DNS lookups (using PTR
  8116. records so clients can determine the canonical hostname for a given
  8117. IPv4 address). Only supported by servers using eventdns; servers
  8118. now announce in their descriptors if they don't support eventdns.
  8119. - Workaround for name servers (like Earthlink's) that hijack failing
  8120. DNS requests and replace the no-such-server answer with a "helpful"
  8121. redirect to an advertising-driven search portal. Also work around
  8122. DNS hijackers who "helpfully" decline to hijack known-invalid
  8123. RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
  8124. lets you turn it off.
  8125. - Servers now check for the case when common DNS requests are going to
  8126. wildcarded addresses (i.e. all getting the same answer), and change
  8127. their exit policy to reject *:* if it's happening.
  8128. - When asked to resolve a hostname, don't use non-exit servers unless
  8129. requested to do so. This allows servers with broken DNS to be
  8130. useful to the network.
  8131. - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
  8132. useless IPv6 DNS resolves.
  8133. - Specify and implement client-side SOCKS5 interface for reverse DNS
  8134. lookups (see doc/socks-extensions.txt). Also cache them.
  8135. - When we change nameservers or IP addresses, reset and re-launch
  8136. our tests for DNS hijacking.
  8137. o Improvements on reachability testing:
  8138. - Servers send out a burst of long-range padding cells once they've
  8139. established that they're reachable. Spread them over 4 circuits,
  8140. so hopefully a few will be fast. This exercises bandwidth and
  8141. bootstraps them into the directory more quickly.
  8142. - When we find our DirPort to be reachable, publish a new descriptor
  8143. so we'll tell the world (reported by pnx).
  8144. - Directory authorities now only decide that routers are reachable
  8145. if their identity keys are as expected.
  8146. - Do DirPort reachability tests less often, since a single test
  8147. chews through many circuits before giving up.
  8148. - Avoid some false positives during reachability testing: don't try
  8149. to test via a server that's on the same /24 network as us.
  8150. - Start publishing one minute or so after we find our ORPort
  8151. to be reachable. This will help reduce the number of descriptors
  8152. we have for ourselves floating around, since it's quite likely
  8153. other things (e.g. DirPort) will change during that minute too.
  8154. - Routers no longer try to rebuild long-term connections to directory
  8155. authorities, and directory authorities no longer try to rebuild
  8156. long-term connections to all servers. We still don't hang up
  8157. connections in these two cases though -- we need to look at it
  8158. more carefully to avoid flapping, and we likely need to wait til
  8159. 0.1.1.x is obsolete.
  8160. o Improvements on rate limiting:
  8161. - Enable write limiting as well as read limiting. Now we sacrifice
  8162. capacity if we're pushing out lots of directory traffic, rather
  8163. than overrunning the user's intended bandwidth limits.
  8164. - Include TLS overhead when counting bandwidth usage; previously, we
  8165. would count only the bytes sent over TLS, but not the bytes used
  8166. to send them.
  8167. - Servers decline directory requests much more aggressively when
  8168. they're low on bandwidth. Otherwise they end up queueing more and
  8169. more directory responses, which can't be good for latency.
  8170. - But never refuse directory requests from local addresses.
  8171. - Be willing to read or write on local connections (e.g. controller
  8172. connections) even when the global rate limiting buckets are empty.
  8173. - Flush local controller connection buffers periodically as we're
  8174. writing to them, so we avoid queueing 4+ megabytes of data before
  8175. trying to flush.
  8176. - Revise and clean up the torrc.sample that we ship with; add
  8177. a section for BandwidthRate and BandwidthBurst.
  8178. o Major features, NT services:
  8179. - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
  8180. command-line flag so that admins can override the default by saying
  8181. "tor --service install --user "SomeUser"". This will not affect
  8182. existing installed services. Also, warn the user that the service
  8183. will look for its configuration file in the service user's
  8184. %appdata% directory. (We can't do the "hardwire the user's appdata
  8185. directory" trick any more, since we may not have read access to that
  8186. directory.)
  8187. - Support running the Tor service with a torrc not in the same
  8188. directory as tor.exe and default to using the torrc located in
  8189. the %appdata%\Tor\ of the user who installed the service. Patch
  8190. from Matt Edman.
  8191. - Add an --ignore-missing-torrc command-line option so that we can
  8192. get the "use sensible defaults if the configuration file doesn't
  8193. exist" behavior even when specifying a torrc location on the
  8194. command line.
  8195. - When stopping an NT service, wait up to 10 sec for it to actually
  8196. stop. (Patch from Matt Edman; resolves bug 295.)
  8197. o Directory authority improvements:
  8198. - Stop letting hibernating or obsolete servers affect uptime and
  8199. bandwidth cutoffs.
  8200. - Stop listing hibernating servers in the v1 directory.
  8201. - Authorities no longer recommend exits as guards if this would shift
  8202. too much load to the exit nodes.
  8203. - Authorities now specify server versions in networkstatus. This adds
  8204. about 2% to the size of compressed networkstatus docs, and allows
  8205. clients to tell which servers support BEGIN_DIR and which don't.
  8206. The implementation is forward-compatible with a proposed future
  8207. protocol version scheme not tied to Tor versions.
  8208. - DirServer configuration lines now have an orport= option so
  8209. clients can open encrypted tunnels to the authorities without
  8210. having downloaded their descriptors yet. Enabled for moria1,
  8211. moria2, tor26, and lefkada now in the default configuration.
  8212. - Add a BadDirectory flag to network status docs so that authorities
  8213. can (eventually) tell clients about caches they believe to be
  8214. broken. Not used yet.
  8215. - Allow authorities to list nodes as bad exits in their
  8216. approved-routers file by fingerprint or by address. If most
  8217. authorities set a BadExit flag for a server, clients don't think
  8218. of it as a general-purpose exit. Clients only consider authorities
  8219. that advertise themselves as listing bad exits.
  8220. - Patch from Steve Hildrey: Generate network status correctly on
  8221. non-versioning dirservers.
  8222. - Have directory authorities allow larger amounts of drift in uptime
  8223. without replacing the server descriptor: previously, a server that
  8224. restarted every 30 minutes could have 48 "interesting" descriptors
  8225. per day.
  8226. - Reserve the nickname "Unnamed" for routers that can't pick
  8227. a hostname: any router can call itself Unnamed; directory
  8228. authorities will never allocate Unnamed to any particular router;
  8229. clients won't believe that any router is the canonical Unnamed.
  8230. o Directory mirrors and clients:
  8231. - Discard any v1 directory info that's over 1 month old (for
  8232. directories) or over 1 week old (for running-routers lists).
  8233. - Clients track responses with status 503 from dirservers. After a
  8234. dirserver has given us a 503, we try not to use it until an hour has
  8235. gone by, or until we have no dirservers that haven't given us a 503.
  8236. - When we get a 503 from a directory, and we're not a server, we no
  8237. longer count the failure against the total number of failures
  8238. allowed for the object we're trying to download.
  8239. - Prepare for servers to publish descriptors less often: never
  8240. discard a descriptor simply for being too old until either it is
  8241. recommended by no authorities, or until we get a better one for
  8242. the same router. Make caches consider retaining old recommended
  8243. routers for even longer.
  8244. - Directory servers now provide 'Pragma: no-cache' and 'Expires'
  8245. headers for content, so that we can work better in the presence of
  8246. caching HTTP proxies.
  8247. - Stop fetching descriptors if you're not a dir mirror and you
  8248. haven't tried to establish any circuits lately. (This currently
  8249. causes some dangerous behavior, because when you start up again
  8250. you'll use your ancient server descriptors.)
  8251. o Major fixes, crashes:
  8252. - Stop crashing when the controller asks us to resetconf more than
  8253. one config option at once. (Vidalia 0.0.11 does this.)
  8254. - Fix a longstanding obscure crash bug that could occur when we run
  8255. out of DNS worker processes, if we're not using eventdns. (Resolves
  8256. bug 390.)
  8257. - Fix an assert that could trigger if a controller quickly set then
  8258. cleared EntryNodes. (Bug found by Udo van den Heuvel.)
  8259. - Avoid crash when telling controller about stream-status and a
  8260. stream is detached.
  8261. - Avoid sending junk to controllers or segfaulting when a controller
  8262. uses EVENT_NEW_DESC with verbose nicknames.
  8263. - Stop triggering asserts if the controller tries to extend hidden
  8264. service circuits (reported by mwenge).
  8265. - If we start a server with ClientOnly 1, then set ClientOnly to 0
  8266. and hup, stop triggering an assert based on an empty onion_key.
  8267. - Mask out all signals in sub-threads; only the libevent signal
  8268. handler should be processing them. This should prevent some crashes
  8269. on some machines using pthreads. (Patch from coderman.)
  8270. - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
  8271. o Major fixes, anonymity/security:
  8272. - Automatically avoid picking more than one node from the same
  8273. /16 network when constructing a circuit. Add an
  8274. "EnforceDistinctSubnets" option to let people disable it if they
  8275. want to operate private test networks on a single subnet.
  8276. - When generating bandwidth history, round down to the nearest
  8277. 1k. When storing accounting data, round up to the nearest 1k.
  8278. - When we're running as a server, remember when we last rotated onion
  8279. keys, so that we will rotate keys once they're a week old even if
  8280. we never stay up for a week ourselves.
  8281. - If a client asked for a server by name, and there's a named server
  8282. in our network-status but we don't have its descriptor yet, we
  8283. could return an unnamed server instead.
  8284. - Reject (most) attempts to use Tor circuits with length one. (If
  8285. many people start using Tor as a one-hop proxy, exit nodes become
  8286. a more attractive target for compromise.)
  8287. - Just because your DirPort is open doesn't mean people should be
  8288. able to remotely teach you about hidden service descriptors. Now
  8289. only accept rendezvous posts if you've got HSAuthoritativeDir set.
  8290. - Fix a potential race condition in the rpm installer. Found by
  8291. Stefan Nordhausen.
  8292. - Do not log IPs with TLS failures for incoming TLS
  8293. connections. (Fixes bug 382.)
  8294. o Major fixes, other:
  8295. - If our system clock jumps back in time, don't publish a negative
  8296. uptime in the descriptor.
  8297. - When we start during an accounting interval before it's time to wake
  8298. up, remember to wake up at the correct time. (May fix bug 342.)
  8299. - Previously, we would cache up to 16 old networkstatus documents
  8300. indefinitely, if they came from nontrusted authorities. Now we
  8301. discard them if they are more than 10 days old.
  8302. - When we have a state file we cannot parse, tell the user and
  8303. move it aside. Now we avoid situations where the user starts
  8304. Tor in 1904, Tor writes a state file with that timestamp in it,
  8305. the user fixes her clock, and Tor refuses to start.
  8306. - Publish a new descriptor after we hup/reload. This is important
  8307. if our config has changed such that we'll want to start advertising
  8308. our DirPort now, etc.
  8309. - If we are using an exit enclave and we can't connect, e.g. because
  8310. its webserver is misconfigured to not listen on localhost, then
  8311. back off and try connecting from somewhere else before we fail.
  8312. o New config options or behaviors:
  8313. - When EntryNodes are configured, rebuild the guard list to contain,
  8314. in order: the EntryNodes that were guards before; the rest of the
  8315. EntryNodes; the nodes that were guards before.
  8316. - Do not warn when individual nodes in the configuration's EntryNodes,
  8317. ExitNodes, etc are down: warn only when all possible nodes
  8318. are down. (Fixes bug 348.)
  8319. - Put a lower-bound on MaxAdvertisedBandwidth.
  8320. - Start using the state file to store bandwidth accounting data:
  8321. the bw_accounting file is now obsolete. We'll keep generating it
  8322. for a while for people who are still using 0.1.2.4-alpha.
  8323. - Try to batch changes to the state file so that we do as few
  8324. disk writes as possible while still storing important things in
  8325. a timely fashion.
  8326. - The state file and the bw_accounting file get saved less often when
  8327. the AvoidDiskWrites config option is set.
  8328. - Make PIDFile work on Windows.
  8329. - Add internal descriptions for a bunch of configuration options:
  8330. accessible via controller interface and in comments in saved
  8331. options files.
  8332. - Reject *:563 (NNTPS) in the default exit policy. We already reject
  8333. NNTP by default, so this seems like a sensible addition.
  8334. - Clients now reject hostnames with invalid characters. This should
  8335. avoid some inadvertent info leaks. Add an option
  8336. AllowNonRFC953Hostnames to disable this behavior, in case somebody
  8337. is running a private network with hosts called @, !, and #.
  8338. - Check for addresses with invalid characters at the exit as well,
  8339. and warn less verbosely when they fail. You can override this by
  8340. setting ServerDNSAllowNonRFC953Addresses to 1.
  8341. - Remove some options that have been deprecated since at least
  8342. 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
  8343. SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
  8344. to set log options. Mark PathlenCoinWeight as obsolete.
  8345. - Stop accepting certain malformed ports in configured exit policies.
  8346. - When the user uses bad syntax in the Log config line, stop
  8347. suggesting other bad syntax as a replacement.
  8348. - Add new config option "ResolvConf" to let the server operator
  8349. choose an alternate resolve.conf file when using eventdns.
  8350. - If one of our entry guards is on the ExcludeNodes list, or the
  8351. directory authorities don't think it's a good guard, treat it as
  8352. if it were unlisted: stop using it as a guard, and throw it off
  8353. the guards list if it stays that way for a long time.
  8354. - Allow directory authorities to be marked separately as authorities
  8355. for the v1 directory protocol, the v2 directory protocol, and
  8356. as hidden service directories, to make it easier to retire old
  8357. authorities. V1 authorities should set "HSAuthoritativeDir 1"
  8358. to continue being hidden service authorities too.
  8359. - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
  8360. - Make TrackExitHosts case-insensitive, and fix the behavior of
  8361. ".suffix" TrackExitHosts items to avoid matching in the middle of
  8362. an address.
  8363. - New DirPort behavior: if you have your dirport set, you download
  8364. descriptors aggressively like a directory mirror, whether or not
  8365. your ORPort is set.
  8366. o Docs:
  8367. - Create a new file ReleaseNotes which was the old ChangeLog. The
  8368. new ChangeLog file now includes the notes for all development
  8369. versions too.
  8370. - Add a new address-spec.txt document to describe our special-case
  8371. addresses: .exit, .onion, and .noconnnect.
  8372. - Fork the v1 directory protocol into its own spec document,
  8373. and mark dir-spec.txt as the currently correct (v2) spec.
  8374. o Packaging, porting, and contrib
  8375. - "tor --verify-config" now exits with -1(255) or 0 depending on
  8376. whether the config options are bad or good.
  8377. - The Debian package now uses --verify-config when (re)starting,
  8378. to distinguish configuration errors from other errors.
  8379. - Adapt a patch from goodell to let the contrib/exitlist script
  8380. take arguments rather than require direct editing.
  8381. - Prevent the contrib/exitlist script from printing the same
  8382. result more than once.
  8383. - Add support to tor-resolve tool for reverse lookups and SOCKS5.
  8384. - In the hidden service example in torrc.sample, stop recommending
  8385. esoteric and discouraged hidden service options.
  8386. - Patch from Michael Mohr to contrib/cross.sh, so it checks more
  8387. values before failing, and always enables eventdns.
  8388. - Try to detect Windows correctly when cross-compiling.
  8389. - Libevent-1.2 exports, but does not define in its headers, strlcpy.
  8390. Try to fix this in configure.in by checking for most functions
  8391. before we check for libevent.
  8392. - Update RPMs to require libevent 1.2.
  8393. - Experimentally re-enable kqueue on OSX when using libevent 1.1b
  8394. or later. Log when we are doing this, so we can diagnose it when
  8395. it fails. (Also, recommend libevent 1.1b for kqueue and
  8396. win32 methods; deprecate libevent 1.0b harder; make libevent
  8397. recommendation system saner.)
  8398. - Build with recent (1.3+) libevents on platforms that do not
  8399. define the nonstandard types "u_int8_t" and friends.
  8400. - Remove architecture from OS X builds. The official builds are
  8401. now universal binaries.
  8402. - Run correctly on OS X platforms with case-sensitive filesystems.
  8403. - Correctly set maximum connection limit on Cygwin. (This time
  8404. for sure!)
  8405. - Start compiling on MinGW on Windows (patches from Mike Chiussi
  8406. and many others).
  8407. - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
  8408. - Finally fix the openssl warnings from newer gccs that believe that
  8409. ignoring a return value is okay, but casting a return value and
  8410. then ignoring it is a sign of madness.
  8411. - On architectures where sizeof(int)>4, still clamp declarable
  8412. bandwidth to INT32_MAX.
  8413. o Minor features, controller:
  8414. - Warn the user when an application uses the obsolete binary v0
  8415. control protocol. We're planning to remove support for it during
  8416. the next development series, so it's good to give people some
  8417. advance warning.
  8418. - Add STREAM_BW events to report per-entry-stream bandwidth
  8419. use. (Patch from Robert Hogan.)
  8420. - Rate-limit SIGNEWNYM signals in response to controllers that
  8421. impolitely generate them for every single stream. (Patch from
  8422. mwenge; closes bug 394.)
  8423. - Add a REMAP status to stream events to note that a stream's
  8424. address has changed because of a cached address or a MapAddress
  8425. directive.
  8426. - Make REMAP stream events have a SOURCE (cache or exit), and
  8427. make them generated in every case where we get a successful
  8428. connected or resolved cell.
  8429. - Track reasons for OR connection failure; make these reasons
  8430. available via the controller interface. (Patch from Mike Perry.)
  8431. - Add a SOCKS_BAD_HOSTNAME client status event so controllers
  8432. can learn when clients are sending malformed hostnames to Tor.
  8433. - Specify and implement some of the controller status events.
  8434. - Have GETINFO dir/status/* work on hosts with DirPort disabled.
  8435. - Reimplement GETINFO so that info/names stays in sync with the
  8436. actual keys.
  8437. - Implement "GETINFO fingerprint".
  8438. - Implement "SETEVENTS GUARD" so controllers can get updates on
  8439. entry guard status as it changes.
  8440. - Make all connections to addresses of the form ".noconnect"
  8441. immediately get closed. This lets application/controller combos
  8442. successfully test whether they're talking to the same Tor by
  8443. watching for STREAM events.
  8444. - Add a REASON field to CIRC events; for backward compatibility, this
  8445. field is sent only to controllers that have enabled the extended
  8446. event format. Also, add additional reason codes to explain why
  8447. a given circuit has been destroyed or truncated. (Patches from
  8448. Mike Perry)
  8449. - Add a REMOTE_REASON field to extended CIRC events to tell the
  8450. controller why a remote OR told us to close a circuit.
  8451. - Stream events also now have REASON and REMOTE_REASON fields,
  8452. working much like those for circuit events.
  8453. - There's now a GETINFO ns/... field so that controllers can ask Tor
  8454. about the current status of a router.
  8455. - A new event type "NS" to inform a controller when our opinion of
  8456. a router's status has changed.
  8457. - Add a GETINFO events/names and GETINFO features/names so controllers
  8458. can tell which events and features are supported.
  8459. - A new CLEARDNSCACHE signal to allow controllers to clear the
  8460. client-side DNS cache without expiring circuits.
  8461. - Fix CIRC controller events so that controllers can learn the
  8462. identity digests of non-Named servers used in circuit paths.
  8463. - Let controllers ask for more useful identifiers for servers. Instead
  8464. of learning identity digests for un-Named servers and nicknames
  8465. for Named servers, the new identifiers include digest, nickname,
  8466. and indication of Named status. Off by default; see control-spec.txt
  8467. for more information.
  8468. - Add a "getinfo address" controller command so it can display Tor's
  8469. best guess to the user.
  8470. - New controller event to alert the controller when our server
  8471. descriptor has changed.
  8472. - Give more meaningful errors on controller authentication failure.
  8473. - Export the default exit policy via the control port, so controllers
  8474. don't need to guess what it is / will be later.
  8475. o Minor bugfixes, controller:
  8476. - When creating a circuit via the controller, send a 'launched'
  8477. event when we're done, so we follow the spec better.
  8478. - Correct the control spec to match how the code actually responds
  8479. to 'getinfo addr-mappings/*'. Reported by daejees.
  8480. - The control spec described a GUARDS event, but the code
  8481. implemented a GUARD event. Standardize on GUARD, but let people
  8482. ask for GUARDS too. Reported by daejees.
  8483. - Give the controller END_STREAM_REASON_DESTROY events _before_ we
  8484. clear the corresponding on_circuit variable, and remember later
  8485. that we don't need to send a redundant CLOSED event. (Resolves part
  8486. 3 of bug 367.)
  8487. - Report events where a resolve succeeded or where we got a socks
  8488. protocol error correctly, rather than calling both of them
  8489. "INTERNAL".
  8490. - Change reported stream target addresses to IP consistently when
  8491. we finally get the IP from an exit node.
  8492. - Send log messages to the controller even if they happen to be very
  8493. long.
  8494. - Flush ERR-level controller status events just like we currently
  8495. flush ERR-level log events, so that a Tor shutdown doesn't prevent
  8496. the controller from learning about current events.
  8497. - Report the circuit number correctly in STREAM CLOSED events. Bug
  8498. reported by Mike Perry.
  8499. - Do not report bizarre values for results of accounting GETINFOs
  8500. when the last second's write or read exceeds the allotted bandwidth.
  8501. - Report "unrecognized key" rather than an empty string when the
  8502. controller tries to fetch a networkstatus that doesn't exist.
  8503. - When the controller does a "GETINFO network-status", tell it
  8504. about even those routers whose descriptors are very old, and use
  8505. long nicknames where appropriate.
  8506. - Fix handling of verbose nicknames with ORCONN controller events:
  8507. make them show up exactly when requested, rather than exactly when
  8508. not requested.
  8509. - Controller signals now work on non-Unix platforms that don't define
  8510. SIGUSR1 and SIGUSR2 the way we expect.
  8511. - Respond to SIGNAL command before we execute the signal, in case
  8512. the signal shuts us down. Suggested by Karsten Loesing.
  8513. - Handle reporting OR_CONN_EVENT_NEW events to the controller.
  8514. o Minor features, code performance:
  8515. - Major performance improvement on inserting descriptors: change
  8516. algorithm from O(n^2) to O(n).
  8517. - Do not rotate onion key immediately after setting it for the first
  8518. time.
  8519. - Call router_have_min_dir_info half as often. (This is showing up in
  8520. some profiles, but not others.)
  8521. - When using GCC, make log_debug never get called at all, and its
  8522. arguments never get evaluated, when no debug logs are configured.
  8523. (This is showing up in some profiles, but not others.)
  8524. - Statistics dumped by -USR2 now include a breakdown of public key
  8525. operations, for profiling.
  8526. - Make the common memory allocation path faster on machines where
  8527. malloc(0) returns a pointer.
  8528. - Split circuit_t into origin_circuit_t and or_circuit_t, and
  8529. split connection_t into edge, or, dir, control, and base structs.
  8530. These will save quite a bit of memory on busy servers, and they'll
  8531. also help us track down bugs in the code and bugs in the spec.
  8532. - Use OpenSSL's AES implementation on platforms where it's faster.
  8533. This could save us as much as 10% CPU usage.
  8534. o Minor features, descriptors and descriptor handling:
  8535. - Avoid duplicate entries on MyFamily line in server descriptor.
  8536. - When Tor receives a router descriptor that it asked for, but
  8537. no longer wants (because it has received fresh networkstatuses
  8538. in the meantime), do not warn the user. Cache the descriptor if
  8539. we're a cache; drop it if we aren't.
  8540. - Servers no longer ever list themselves in their "family" line,
  8541. even if configured to do so. This makes it easier to configure
  8542. family lists conveniently.
  8543. o Minor fixes, confusing/misleading log messages:
  8544. - Display correct results when reporting which versions are
  8545. recommended, and how recommended they are. (Resolves bug 383.)
  8546. - Inform the server operator when we decide not to advertise a
  8547. DirPort due to AccountingMax enabled or a low BandwidthRate.
  8548. - Only include function names in log messages for info/debug messages.
  8549. For notice/warn/err, the content of the message should be clear on
  8550. its own, and printing the function name only confuses users.
  8551. - Remove even more protocol-related warnings from Tor server logs,
  8552. such as bad TLS handshakes and malformed begin cells.
  8553. - Fix bug 314: Tor clients issued "unsafe socks" warnings even
  8554. when the IP address is mapped through MapAddress to a hostname.
  8555. - Fix misleading log messages: an entry guard that is "unlisted",
  8556. as well as not known to be "down" (because we've never heard
  8557. of it), is not therefore "up".
  8558. o Minor fixes, old/obsolete behavior:
  8559. - Start assuming we can use a create_fast cell if we don't know
  8560. what version a router is running.
  8561. - We no longer look for identity and onion keys in "identity.key" and
  8562. "onion.key" -- these were replaced by secret_id_key and
  8563. secret_onion_key in 0.0.8pre1.
  8564. - We no longer require unrecognized directory entries to be
  8565. preceded by "opt".
  8566. - Drop compatibility with obsolete Tors that permit create cells
  8567. to have the wrong circ_id_type.
  8568. - Remove code to special-case "-cvs" ending, since it has not
  8569. actually mattered since 0.0.9.
  8570. - Don't re-write the fingerprint file every restart, unless it has
  8571. changed.
  8572. o Minor fixes, misc client-side behavior:
  8573. - Always remove expired routers and networkstatus docs before checking
  8574. whether we have enough information to build circuits. (Fixes
  8575. bug 373.)
  8576. - When computing clock skew from directory HTTP headers, consider what
  8577. time it was when we finished asking for the directory, not what
  8578. time it is now.
  8579. - Make our socks5 handling more robust to broken socks clients:
  8580. throw out everything waiting on the buffer in between socks
  8581. handshake phases, since they can't possibly (so the theory
  8582. goes) have predicted what we plan to respond to them.
  8583. - Expire socks connections if they spend too long waiting for the
  8584. handshake to finish. Previously we would let them sit around for
  8585. days, if the connecting application didn't close them either.
  8586. - And if the socks handshake hasn't started, don't send a
  8587. "DNS resolve socks failed" handshake reply; just close it.
  8588. - If the user asks to use invalid exit nodes, be willing to use
  8589. unstable ones.
  8590. - Track unreachable entry guards correctly: don't conflate
  8591. 'unreachable by us right now' with 'listed as down by the directory
  8592. authorities'. With the old code, if a guard was unreachable by us
  8593. but listed as running, it would clog our guard list forever.
  8594. - Behave correctly in case we ever have a network with more than
  8595. 2GB/s total advertised capacity.
  8596. - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
  8597. - Fix a memory leak when we ask for "all" networkstatuses and we
  8598. get one we don't recognize.
  8599. Changes in version 0.1.1.26 - 2006-12-14
  8600. o Security bugfixes:
  8601. - Stop sending the HttpProxyAuthenticator string to directory
  8602. servers when directory connections are tunnelled through Tor.
  8603. - Clients no longer store bandwidth history in the state file.
  8604. - Do not log introduction points for hidden services if SafeLogging
  8605. is set.
  8606. o Minor bugfixes:
  8607. - Fix an assert failure when a directory authority sets
  8608. AuthDirRejectUnlisted and then receives a descriptor from an
  8609. unlisted router (reported by seeess).
  8610. Changes in version 0.1.1.25 - 2006-11-04
  8611. o Major bugfixes:
  8612. - When a client asks us to resolve (rather than connect to)
  8613. an address, and we have a cached answer, give them the cached
  8614. answer. Previously, we would give them no answer at all.
  8615. - We were building exactly the wrong circuits when we predict
  8616. hidden service requirements, meaning Tor would have to build all
  8617. its circuits on demand.
  8618. - If none of our live entry guards have a high uptime, but we
  8619. require a guard with a high uptime, try adding a new guard before
  8620. we give up on the requirement. This patch should make long-lived
  8621. connections more stable on average.
  8622. - When testing reachability of our DirPort, don't launch new
  8623. tests when there's already one in progress -- unreachable
  8624. servers were stacking up dozens of testing streams.
  8625. o Security bugfixes:
  8626. - When the user sends a NEWNYM signal, clear the client-side DNS
  8627. cache too. Otherwise we continue to act on previous information.
  8628. o Minor bugfixes:
  8629. - Avoid a memory corruption bug when creating a hash table for
  8630. the first time.
  8631. - Avoid possibility of controller-triggered crash when misusing
  8632. certain commands from a v0 controller on platforms that do not
  8633. handle printf("%s",NULL) gracefully.
  8634. - Avoid infinite loop on unexpected controller input.
  8635. - Don't log spurious warnings when we see a circuit close reason we
  8636. don't recognize; it's probably just from a newer version of Tor.
  8637. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  8638. Tor/Privoxy we also uninstall Vidalia.
  8639. Changes in version 0.1.1.24 - 2006-09-29
  8640. o Major bugfixes:
  8641. - Allow really slow clients to not hang up five minutes into their
  8642. directory downloads (suggested by Adam J. Richter).
  8643. - Fix major performance regression from 0.1.0.x: instead of checking
  8644. whether we have enough directory information every time we want to
  8645. do something, only check when the directory information has changed.
  8646. This should improve client CPU usage by 25-50%.
  8647. - Don't crash if, after a server has been running for a while,
  8648. it can't resolve its hostname.
  8649. - When a client asks us to resolve (not connect to) an address,
  8650. and we have a cached answer, give them the cached answer.
  8651. Previously, we would give them no answer at all.
  8652. o Minor bugfixes:
  8653. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  8654. - Don't crash when the controller receives a third argument to an
  8655. "extendcircuit" request.
  8656. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  8657. response; fix error code when "getinfo dir/status/" fails.
  8658. - Fix configure.in to not produce broken configure files with
  8659. more recent versions of autoconf. Thanks to Clint for his auto*
  8660. voodoo.
  8661. - Fix security bug on NetBSD that could allow someone to force
  8662. uninitialized RAM to be sent to a server's DNS resolver. This
  8663. only affects NetBSD and other platforms that do not bounds-check
  8664. tolower().
  8665. - Warn user when using libevent 1.1a or earlier with win32 or kqueue
  8666. methods: these are known to be buggy.
  8667. - If we're a directory mirror and we ask for "all" network status
  8668. documents, we would discard status documents from authorities
  8669. we don't recognize.
  8670. Changes in version 0.1.1.23 - 2006-07-30
  8671. o Major bugfixes:
  8672. - Fast Tor servers, especially exit nodes, were triggering asserts
  8673. due to a bug in handling the list of pending DNS resolves. Some
  8674. bugs still remain here; we're hunting them.
  8675. - Entry guards could crash clients by sending unexpected input.
  8676. - More fixes on reachability testing: if you find yourself reachable,
  8677. then don't ever make any client requests (so you stop predicting
  8678. circuits), then hup or have your clock jump, then later your IP
  8679. changes, you won't think circuits are working, so you won't try to
  8680. test reachability, so you won't publish.
  8681. o Minor bugfixes:
  8682. - Avoid a crash if the controller does a resetconf firewallports
  8683. and then a setconf fascistfirewall=1.
  8684. - Avoid an integer underflow when the dir authority decides whether
  8685. a router is stable: we might wrongly label it stable, and compute
  8686. a slightly wrong median stability, when a descriptor is published
  8687. later than now.
  8688. - Fix a place where we might trigger an assert if we can't build our
  8689. own server descriptor yet.
  8690. Changes in version 0.1.1.22 - 2006-07-05
  8691. o Major bugfixes:
  8692. - Fix a big bug that was causing servers to not find themselves
  8693. reachable if they changed IP addresses. Since only 0.1.1.22+
  8694. servers can do reachability testing correctly, now we automatically
  8695. make sure to test via one of these.
  8696. - Fix to allow clients and mirrors to learn directory info from
  8697. descriptor downloads that get cut off partway through.
  8698. - Directory authorities had a bug in deciding if a newly published
  8699. descriptor was novel enough to make everybody want a copy -- a few
  8700. servers seem to be publishing new descriptors many times a minute.
  8701. o Minor bugfixes:
  8702. - Fix a rare bug that was causing some servers to complain about
  8703. "closing wedged cpuworkers" and skip some circuit create requests.
  8704. - Make the Exit flag in directory status documents actually work.
  8705. Changes in version 0.1.1.21 - 2006-06-10
  8706. o Crash and assert fixes from 0.1.1.20:
  8707. - Fix a rare crash on Tor servers that have enabled hibernation.
  8708. - Fix a seg fault on startup for Tor networks that use only one
  8709. directory authority.
  8710. - Fix an assert from a race condition that occurs on Tor servers
  8711. while exiting, where various threads are trying to log that they're
  8712. exiting, and delete the logs, at the same time.
  8713. - Make our unit tests pass again on certain obscure platforms.
  8714. o Other fixes:
  8715. - Add support for building SUSE RPM packages.
  8716. - Speed up initial bootstrapping for clients: if we are making our
  8717. first ever connection to any entry guard, then don't mark it down
  8718. right after that.
  8719. - When only one Tor server in the network is labelled as a guard,
  8720. and we've already picked him, we would cycle endlessly picking him
  8721. again, being unhappy about it, etc. Now we specifically exclude
  8722. current guards when picking a new guard.
  8723. - Servers send create cells more reliably after the TLS connection
  8724. is established: we were sometimes forgetting to send half of them
  8725. when we had more than one pending.
  8726. - If we get a create cell that asks us to extend somewhere, but the
  8727. Tor server there doesn't match the expected digest, we now send
  8728. a destroy cell back, rather than silently doing nothing.
  8729. - Make options->RedirectExit work again.
  8730. - Make cookie authentication for the controller work again.
  8731. - Stop being picky about unusual characters in the arguments to
  8732. mapaddress. It's none of our business.
  8733. - Add a new config option "TestVia" that lets you specify preferred
  8734. middle hops to use for test circuits. Perhaps this will let me
  8735. debug the reachability problems better.
  8736. o Log / documentation fixes:
  8737. - If we're a server and some peer has a broken TLS certificate, don't
  8738. log about it unless ProtocolWarnings is set, i.e., we want to hear
  8739. about protocol violations by others.
  8740. - Fix spelling of VirtualAddrNetwork in man page.
  8741. - Add a better explanation at the top of the autogenerated torrc file
  8742. about what happened to our old torrc.
  8743. Changes in version 0.1.1.20 - 2006-05-23
  8744. o Crash and assert fixes from 0.1.0.17:
  8745. - Fix assert bug in close_logs() on exit: when we close and delete
  8746. logs, remove them all from the global "logfiles" list.
  8747. - Fix an assert error when we're out of space in the connection_list
  8748. and we try to post a hidden service descriptor (reported by Peter
  8749. Palfrader).
  8750. - Fix a rare assert error when we've tried all intro points for
  8751. a hidden service and we try fetching the service descriptor again:
  8752. "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
  8753. - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
  8754. out and refuse the setconf if it would fail.
  8755. - If you specify a relative torrc path and you set RunAsDaemon in
  8756. your torrc, then it chdir()'s to the new directory. If you then
  8757. HUP, it tries to load the new torrc location, fails, and exits.
  8758. The fix: no longer allow a relative path to torrc when using -f.
  8759. - Check for integer overflows in more places, when adding elements
  8760. to smartlists. This could possibly prevent a buffer overflow
  8761. on malicious huge inputs.
  8762. o Security fixes, major:
  8763. - When we're printing strings from the network, don't try to print
  8764. non-printable characters. Now we're safer against shell escape
  8765. sequence exploits, and also against attacks to fool users into
  8766. misreading their logs.
  8767. - Implement entry guards: automatically choose a handful of entry
  8768. nodes and stick with them for all circuits. Only pick new guards
  8769. when the ones you have are unsuitable, and if the old guards
  8770. become suitable again, switch back. This will increase security
  8771. dramatically against certain end-point attacks. The EntryNodes
  8772. config option now provides some hints about which entry guards you
  8773. want to use most; and StrictEntryNodes means to only use those.
  8774. Fixes CVE-2006-0414.
  8775. - Implement exit enclaves: if we know an IP address for the
  8776. destination, and there's a running Tor server at that address
  8777. which allows exit to the destination, then extend the circuit to
  8778. that exit first. This provides end-to-end encryption and end-to-end
  8779. authentication. Also, if the user wants a .exit address or enclave,
  8780. use 4 hops rather than 3, and cannibalize a general circ for it
  8781. if you can.
  8782. - Obey our firewall options more faithfully:
  8783. . If we can't get to a dirserver directly, try going via Tor.
  8784. . Don't ever try to connect (as a client) to a place our
  8785. firewall options forbid.
  8786. . If we specify a proxy and also firewall options, obey the
  8787. firewall options even when we're using the proxy: some proxies
  8788. can only proxy to certain destinations.
  8789. - Make clients regenerate their keys when their IP address changes.
  8790. - For the OS X package's modified privoxy config file, comment
  8791. out the "logfile" line so we don't log everything passed
  8792. through privoxy.
  8793. - Our TLS handshakes were generating a single public/private
  8794. keypair for the TLS context, rather than making a new one for
  8795. each new connection. Oops. (But we were still rotating them
  8796. periodically, so it's not so bad.)
  8797. - When we were cannibalizing a circuit with a particular exit
  8798. node in mind, we weren't checking to see if that exit node was
  8799. already present earlier in the circuit. Now we are.
  8800. - Require server descriptors to list IPv4 addresses -- hostnames
  8801. are no longer allowed. This also fixes potential vulnerabilities
  8802. to servers providing hostnames as their address and then
  8803. preferentially resolving them so they can partition users.
  8804. - Our logic to decide if the OR we connected to was the right guy
  8805. was brittle and maybe open to a mitm for invalid routers.
  8806. o Security fixes, minor:
  8807. - Adjust tor-spec.txt to parameterize cell and key lengths. Now
  8808. Ian Goldberg can prove things about our handshake protocol more
  8809. easily.
  8810. - Make directory authorities generate a separate "guard" flag to
  8811. mean "would make a good entry guard". Clients now honor the
  8812. is_guard flag rather than looking at is_fast or is_stable.
  8813. - Try to list MyFamily elements by key, not by nickname, and warn
  8814. if we've not heard of a server.
  8815. - Start using RAND_bytes rather than RAND_pseudo_bytes from
  8816. OpenSSL. Also, reseed our entropy every hour, not just at
  8817. startup. And add entropy in 512-bit chunks, not 160-bit chunks.
  8818. - Refuse server descriptors where the fingerprint line doesn't match
  8819. the included identity key. Tor doesn't care, but other apps (and
  8820. humans) might actually be trusting the fingerprint line.
  8821. - We used to kill the circuit when we receive a relay command we
  8822. don't recognize. Now we just drop that cell.
  8823. - Fix a bug found by Lasse Overlier: when we were making internal
  8824. circuits (intended to be cannibalized later for rendezvous and
  8825. introduction circuits), we were picking them so that they had
  8826. useful exit nodes. There was no need for this, and it actually
  8827. aids some statistical attacks.
  8828. - Start treating internal circuits and exit circuits separately.
  8829. It's important to keep them separate because internal circuits
  8830. have their last hops picked like middle hops, rather than like
  8831. exit hops. So exiting on them will break the user's expectations.
  8832. - Fix a possible way to DoS dirservers.
  8833. - When the client asked for a rendezvous port that the hidden
  8834. service didn't want to provide, we were sending an IP address
  8835. back along with the end cell. Fortunately, it was zero. But stop
  8836. that anyway.
  8837. o Packaging improvements:
  8838. - Implement --with-libevent-dir option to ./configure. Improve
  8839. search techniques to find libevent, and use those for openssl too.
  8840. - Fix a couple of bugs in OpenSSL detection. Deal better when
  8841. there are multiple SSLs installed with different versions.
  8842. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
  8843. - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
  8844. "-Wall -g -O2".
  8845. - Make unit tests (and other invocations that aren't the real Tor)
  8846. run without launching listeners, creating subdirectories, and so on.
  8847. - The OS X installer was adding a symlink for tor_resolve but
  8848. the binary was called tor-resolve (reported by Thomas Hardly).
  8849. - Now we can target arch and OS in rpm builds (contributed by
  8850. Phobos). Also make the resulting dist-rpm filename match the
  8851. target arch.
  8852. - Apply Matt Ghali's --with-syslog-facility patch to ./configure
  8853. if you log to syslog and want something other than LOG_DAEMON.
  8854. - Fix the torify (tsocks) config file to not use Tor for localhost
  8855. connections.
  8856. - Start shipping socks-extensions.txt, tor-doc-unix.html,
  8857. tor-doc-server.html, and stylesheet.css in the tarball.
  8858. - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
  8859. They are useless now.
  8860. - Add Peter Palfrader's contributed check-tor script. It lets you
  8861. easily check whether a given server (referenced by nickname)
  8862. is reachable by you.
  8863. - Add BSD-style contributed startup script "rc.subr" from Peter
  8864. Thoenen.
  8865. o Directory improvements -- new directory protocol:
  8866. - See tor/doc/dir-spec.txt for all the juicy details. Key points:
  8867. - Authorities and caches publish individual descriptors (by
  8868. digest, by fingerprint, by "all", and by "tell me yours").
  8869. - Clients don't download or use the old directory anymore. Now they
  8870. download network-statuses from the directory authorities, and
  8871. fetch individual server descriptors as needed from mirrors.
  8872. - Clients don't download descriptors of non-running servers.
  8873. - Download descriptors by digest, not by fingerprint. Caches try to
  8874. download all listed digests from authorities; clients try to
  8875. download "best" digests from caches. This avoids partitioning
  8876. and isolating attacks better.
  8877. - Only upload a new server descriptor when options change, 18
  8878. hours have passed, uptime is reset, or bandwidth changes a lot.
  8879. - Directory authorities silently throw away new descriptors that
  8880. haven't changed much if the timestamps are similar. We do this to
  8881. tolerate older Tor servers that upload a new descriptor every 15
  8882. minutes. (It seemed like a good idea at the time.)
  8883. - Clients choose directory servers from the network status lists,
  8884. not from their internal list of router descriptors. Now they can
  8885. go to caches directly rather than needing to go to authorities
  8886. to bootstrap the first set of descriptors.
  8887. - When picking a random directory, prefer non-authorities if any
  8888. are known.
  8889. - Add a new flag to network-status indicating whether the server
  8890. can answer v2 directory requests too.
  8891. - Directory mirrors now cache up to 16 unrecognized network-status
  8892. docs, so new directory authorities will be cached too.
  8893. - Stop parsing, storing, or using running-routers output (but
  8894. mirrors still cache and serve it).
  8895. - Clients consider a threshold of "versioning" directory authorities
  8896. before deciding whether to warn the user that he's obsolete.
  8897. - Authorities publish separate sorted lists of recommended versions
  8898. for clients and for servers.
  8899. - Change DirServers config line to note which dirs are v1 authorities.
  8900. - Put nicknames on the DirServer line, so we can refer to them
  8901. without requiring all our users to memorize their IP addresses.
  8902. - Remove option when getting directory cache to see whether they
  8903. support running-routers; they all do now. Replace it with one
  8904. to see whether caches support v2 stuff.
  8905. - Stop listing down or invalid nodes in the v1 directory. This
  8906. reduces its bulk by about 1/3, and reduces load on mirrors.
  8907. - Mirrors no longer cache the v1 directory as often.
  8908. - If we as a directory mirror don't know of any v1 directory
  8909. authorities, then don't try to cache any v1 directories.
  8910. o Other directory improvements:
  8911. - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
  8912. fifth authoritative directory servers.
  8913. - Directory authorities no longer require an open connection from
  8914. a server to consider him "reachable". We need this change because
  8915. when we add new directory authorities, old servers won't know not
  8916. to hang up on them.
  8917. - Dir authorities now do their own external reachability testing
  8918. of each server, and only list as running the ones they found to
  8919. be reachable. We also send back warnings to the server's logs if
  8920. it uploads a descriptor that we already believe is unreachable.
  8921. - Spread the directory authorities' reachability testing over the
  8922. entire testing interval, so we don't try to do 500 TLS's at once
  8923. every 20 minutes.
  8924. - Make the "stable" router flag in network-status be the median of
  8925. the uptimes of running valid servers, and make clients pay
  8926. attention to the network-status flags. Thus the cutoff adapts
  8927. to the stability of the network as a whole, making IRC, IM, etc
  8928. connections more reliable.
  8929. - Make the v2 dir's "Fast" flag based on relative capacity, just
  8930. like "Stable" is based on median uptime. Name everything in the
  8931. top 7/8 Fast, and only the top 1/2 gets to be a Guard.
  8932. - Retry directory requests if we fail to get an answer we like
  8933. from a given dirserver (we were retrying before, but only if
  8934. we fail to connect).
  8935. - Return a robots.txt on our dirport to discourage google indexing.
  8936. o Controller protocol improvements:
  8937. - Revised controller protocol (version 1) that uses ascii rather
  8938. than binary: tor/doc/control-spec.txt. Add supporting libraries
  8939. in python and java and c# so you can use the controller from your
  8940. applications without caring how our protocol works.
  8941. - Allow the DEBUG controller event to work again. Mark certain log
  8942. entries as "don't tell this to controllers", so we avoid cycles.
  8943. - New controller function "getinfo accounting", to ask how
  8944. many bytes we've used in this time period.
  8945. - Add a "resetconf" command so you can set config options like
  8946. AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
  8947. a config option in the torrc with no value, then it clears it
  8948. entirely (rather than setting it to its default).
  8949. - Add a "getinfo config-file" to tell us where torrc is. Also
  8950. expose guard nodes, config options/names.
  8951. - Add a "quit" command (when when using the controller manually).
  8952. - Add a new signal "newnym" to "change pseudonyms" -- that is, to
  8953. stop using any currently-dirty circuits for new streams, so we
  8954. don't link new actions to old actions. This also occurs on HUP
  8955. or "signal reload".
  8956. - If we would close a stream early (e.g. it asks for a .exit that
  8957. we know would refuse it) but the LeaveStreamsUnattached config
  8958. option is set by the controller, then don't close it.
  8959. - Add a new controller event type "authdir_newdescs" that allows
  8960. controllers to get all server descriptors that were uploaded to
  8961. a router in its role as directory authority.
  8962. - New controller option "getinfo desc/all-recent" to fetch the
  8963. latest server descriptor for every router that Tor knows about.
  8964. - Fix the controller's "attachstream 0" command to treat conn like
  8965. it just connected, doing address remapping, handling .exit and
  8966. .onion idioms, and so on. Now we're more uniform in making sure
  8967. that the controller hears about new and closing connections.
  8968. - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
  8969. the controller. Also, rotate dns and cpu workers if the controller
  8970. changes options that will affect them; and initialize the dns
  8971. worker cache tree whether or not we start out as a server.
  8972. - Add a new circuit purpose 'controller' to let the controller ask
  8973. for a circuit that Tor won't try to use. Extend the "extendcircuit"
  8974. controller command to let you specify the purpose if you're starting
  8975. a new circuit. Add a new "setcircuitpurpose" controller command to
  8976. let you change a circuit's purpose after it's been created.
  8977. - Let the controller ask for "getinfo dir/server/foo" so it can ask
  8978. directly rather than connecting to the dir port. "getinfo
  8979. dir/status/foo" also works, but currently only if your DirPort
  8980. is enabled.
  8981. - Let the controller tell us about certain router descriptors
  8982. that it doesn't want Tor to use in circuits. Implement
  8983. "setrouterpurpose" and modify "+postdescriptor" to do this.
  8984. - If the controller's *setconf commands fail, collect an error
  8985. message in a string and hand it back to the controller -- don't
  8986. just tell them to go read their logs.
  8987. o Scalability, resource management, and performance:
  8988. - Fix a major load balance bug: we were round-robin reading in 16 KB
  8989. chunks, and servers with bandwidthrate of 20 KB, while downloading
  8990. a 600 KB directory, would starve their other connections. Now we
  8991. try to be a bit more fair.
  8992. - Be more conservative about whether to advertise our DirPort.
  8993. The main change is to not advertise if we're running at capacity
  8994. and either a) we could hibernate ever or b) our capacity is low
  8995. and we're using a default DirPort.
  8996. - We weren't cannibalizing circuits correctly for
  8997. CIRCUIT_PURPOSE_C_ESTABLISH_REND and
  8998. CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
  8999. build those from scratch. This should make hidden services faster.
  9000. - Predict required circuits better, with an eye toward making hidden
  9001. services faster on the service end.
  9002. - Compress exit policies even more: look for duplicate lines and
  9003. remove them.
  9004. - Generate 18.0.0.0/8 address policy format in descs when we can;
  9005. warn when the mask is not reducible to a bit-prefix.
  9006. - There used to be two ways to specify your listening ports in a
  9007. server descriptor: on the "router" line and with a separate "ports"
  9008. line. Remove support for the "ports" line.
  9009. - Reduce memory requirements in our structs by changing the order
  9010. of fields. Replace balanced trees with hash tables. Inline
  9011. bottleneck smartlist functions. Add a "Map from digest to void*"
  9012. abstraction so we can do less hex encoding/decoding, and use it
  9013. in router_get_by_digest(). Many other CPU and memory improvements.
  9014. - Allow tor_gzip_uncompress to extract as much as possible from
  9015. truncated compressed data. Try to extract as many
  9016. descriptors as possible from truncated http responses (when
  9017. purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
  9018. - Make circ->onionskin a pointer, not a static array. moria2 was using
  9019. 125000 circuit_t's after it had been up for a few weeks, which
  9020. translates to 20+ megs of wasted space.
  9021. - The private half of our EDH handshake keys are now chosen out
  9022. of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
  9023. - Stop doing the complex voodoo overkill checking for insecure
  9024. Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
  9025. - Do round-robin writes for TLS of at most 16 kB per write. This
  9026. might be more fair on loaded Tor servers.
  9027. - Do not use unaligned memory access on alpha, mips, or mipsel.
  9028. It *works*, but is very slow, so we treat them as if it doesn't.
  9029. o Other bugfixes and improvements:
  9030. - Start storing useful information to $DATADIR/state, so we can
  9031. remember things across invocations of Tor. Retain unrecognized
  9032. lines so we can be forward-compatible, and write a TorVersion line
  9033. so we can be backward-compatible.
  9034. - If ORPort is set, Address is not explicitly set, and our hostname
  9035. resolves to a private IP address, try to use an interface address
  9036. if it has a public address. Now Windows machines that think of
  9037. themselves as localhost can guess their address.
  9038. - Regenerate our local descriptor if it's dirty and we try to use
  9039. it locally (e.g. if it changes during reachability detection).
  9040. This was causing some Tor servers to keep publishing the same
  9041. initial descriptor forever.
  9042. - Tor servers with dynamic IP addresses were needing to wait 18
  9043. hours before they could start doing reachability testing using
  9044. the new IP address and ports. This is because they were using
  9045. the internal descriptor to learn what to test, yet they were only
  9046. rebuilding the descriptor once they decided they were reachable.
  9047. - It turns out we couldn't bootstrap a network since we added
  9048. reachability detection in 0.1.0.1-rc. Good thing the Tor network
  9049. has never gone down. Add an AssumeReachable config option to let
  9050. servers and authorities bootstrap. When we're trying to build a
  9051. high-uptime or high-bandwidth circuit but there aren't enough
  9052. suitable servers, try being less picky rather than simply failing.
  9053. - Newly bootstrapped Tor networks couldn't establish hidden service
  9054. circuits until they had nodes with high uptime. Be more tolerant.
  9055. - Really busy servers were keeping enough circuits open on stable
  9056. connections that they were wrapping around the circuit_id
  9057. space. (It's only two bytes.) This exposed a bug where we would
  9058. feel free to reuse a circuit_id even if it still exists but has
  9059. been marked for close. Try to fix this bug. Some bug remains.
  9060. - When we fail to bind or listen on an incoming or outgoing
  9061. socket, we now close it before refusing, rather than just
  9062. leaking it. (Thanks to Peter Palfrader for finding.)
  9063. - Fix a file descriptor leak in start_daemon().
  9064. - On Windows, you can't always reopen a port right after you've
  9065. closed it. So change retry_listeners() to only close and re-open
  9066. ports that have changed.
  9067. - Workaround a problem with some http proxies that refuse GET
  9068. requests that specify "Content-Length: 0". Reported by Adrian.
  9069. - Recover better from TCP connections to Tor servers that are
  9070. broken but don't tell you (it happens!); and rotate TLS
  9071. connections once a week.
  9072. - Fix a scary-looking but apparently harmless bug where circuits
  9073. would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
  9074. servers, and never switch to state CIRCUIT_STATE_OPEN.
  9075. - Check for even more Windows version flags when writing the platform
  9076. string in server descriptors, and note any we don't recognize.
  9077. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
  9078. get a better idea of why their circuits failed. Not used yet.
  9079. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
  9080. We don't use them yet, but maybe one day our DNS resolver will be
  9081. able to discover them.
  9082. - Let people type "tor --install" as well as "tor -install" when they
  9083. want to make it an NT service.
  9084. - Looks like we were never delivering deflated (i.e. compressed)
  9085. running-routers lists, even when asked. Oops.
  9086. - We were leaking some memory every time the client changed IPs.
  9087. - Clean up more of the OpenSSL memory when exiting, so we can detect
  9088. memory leaks better.
  9089. - Never call free() on tor_malloc()d memory. This will help us
  9090. use dmalloc to detect memory leaks.
  9091. - Some Tor servers process billions of cells per day. These
  9092. statistics are now uint64_t's.
  9093. - Check [X-]Forwarded-For headers in HTTP requests when generating
  9094. log messages. This lets people run dirservers (and caches) behind
  9095. Apache but still know which IP addresses are causing warnings.
  9096. - Fix minor integer overflow in calculating when we expect to use up
  9097. our bandwidth allocation before hibernating.
  9098. - Lower the minimum required number of file descriptors to 1000,
  9099. so we can have some overhead for Valgrind on Linux, where the
  9100. default ulimit -n is 1024.
  9101. - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
  9102. and its existence is confusing some users.
  9103. o Config option fixes:
  9104. - Add a new config option ExitPolicyRejectPrivate which defaults
  9105. to on. Now all exit policies will begin with rejecting private
  9106. addresses, unless the server operator explicitly turns it off.
  9107. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
  9108. - Add new ReachableORAddresses and ReachableDirAddresses options
  9109. that understand address policies. FascistFirewall is now a synonym
  9110. for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
  9111. - Start calling it FooListenAddress rather than FooBindAddress,
  9112. since few of our users know what it means to bind an address
  9113. or port.
  9114. - If the user gave Tor an odd number of command-line arguments,
  9115. we were silently ignoring the last one. Now we complain and fail.
  9116. This wins the oldest-bug prize -- this bug has been present since
  9117. November 2002, as released in Tor 0.0.0.
  9118. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
  9119. torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
  9120. it would silently ignore the 6668.
  9121. - If we get a linelist or linelist_s config option from the torrc,
  9122. e.g. ExitPolicy, and it has no value, warn and skip rather than
  9123. silently resetting it to its default.
  9124. - Setconf was appending items to linelists, not clearing them.
  9125. - Add MyFamily to torrc.sample in the server section, so operators
  9126. will be more likely to learn that it exists.
  9127. - Make ContactInfo mandatory for authoritative directory servers.
  9128. - MaxConn has been obsolete for a while now. Document the ConnLimit
  9129. config option, which is a *minimum* number of file descriptors
  9130. that must be available else Tor refuses to start.
  9131. - Get rid of IgnoreVersion undocumented config option, and make us
  9132. only warn, never exit, when we're running an obsolete version.
  9133. - Make MonthlyAccountingStart config option truly obsolete now.
  9134. - Correct the man page entry on TrackHostExitsExpire.
  9135. - Let directory authorities start even if they don't specify an
  9136. Address config option.
  9137. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
  9138. reflect the updated flags in our v2 dir protocol.
  9139. o Config option features:
  9140. - Add a new config option FastFirstHopPK (on by default) so clients
  9141. do a trivial crypto handshake for their first hop, since TLS has
  9142. already taken care of confidentiality and authentication.
  9143. - Let the user set ControlListenAddress in the torrc. This can be
  9144. dangerous, but there are some cases (like a secured LAN) where it
  9145. makes sense.
  9146. - New config options to help controllers: FetchServerDescriptors
  9147. and FetchHidServDescriptors for whether to fetch server
  9148. info and hidserv info or let the controller do it, and
  9149. PublishServerDescriptor and PublishHidServDescriptors.
  9150. - Also let the controller set the __AllDirActionsPrivate config
  9151. option if you want all directory fetches/publishes to happen via
  9152. Tor (it assumes your controller bootstraps your circuits).
  9153. - Add "HardwareAccel" config option: support for crypto hardware
  9154. accelerators via OpenSSL. Off by default, until we find somebody
  9155. smart who can test it for us. (It appears to produce seg faults
  9156. in at least some cases.)
  9157. - New config option "AuthDirRejectUnlisted" for directory authorities
  9158. as a panic button: if we get flooded with unusable servers we can
  9159. revert to only listing servers in the approved-routers file.
  9160. - Directory authorities can now reject/invalidate by key and IP,
  9161. with the config options "AuthDirInvalid" and "AuthDirReject", or
  9162. by marking a fingerprint as "!reject" or "!invalid" (as its
  9163. nickname) in the approved-routers file. This is useful since
  9164. currently we automatically list servers as running and usable
  9165. even if we know they're jerks.
  9166. - Add a new config option TestSocks so people can see whether their
  9167. applications are using socks4, socks4a, socks5-with-ip, or
  9168. socks5-with-fqdn. This way they don't have to keep mucking
  9169. with tcpdump and wondering if something got cached somewhere.
  9170. - Add "private:*" as an alias in configuration for policies. Now
  9171. you can simplify your exit policy rather than needing to list
  9172. every single internal or nonroutable network space.
  9173. - Accept "private:*" in routerdesc exit policies; not generated yet
  9174. because older Tors do not understand it.
  9175. - Add configuration option "V1AuthoritativeDirectory 1" which
  9176. moria1, moria2, and tor26 have set.
  9177. - Implement an option, VirtualAddrMask, to set which addresses
  9178. get handed out in response to mapaddress requests. This works
  9179. around a bug in tsocks where 127.0.0.0/8 is never socksified.
  9180. - Add a new config option FetchUselessDescriptors, off by default,
  9181. for when you plan to run "exitlist" on your client and you want
  9182. to know about even the non-running descriptors.
  9183. - SocksTimeout: How long do we let a socks connection wait
  9184. unattached before we fail it?
  9185. - CircuitBuildTimeout: Cull non-open circuits that were born
  9186. at least this many seconds ago.
  9187. - CircuitIdleTimeout: Cull open clean circuits that were born
  9188. at least this many seconds ago.
  9189. - New config option SafeSocks to reject all application connections
  9190. using unsafe socks protocols. Defaults to off.
  9191. o Improved and clearer log messages:
  9192. - Reduce clutter in server logs. We're going to try to make
  9193. them actually usable now. New config option ProtocolWarnings that
  9194. lets you hear about how _other Tors_ are breaking the protocol. Off
  9195. by default.
  9196. - Divide log messages into logging domains. Once we put some sort
  9197. of interface on this, it will let people looking at more verbose
  9198. log levels specify the topics they want to hear more about.
  9199. - Log server fingerprint on startup, so new server operators don't
  9200. have to go hunting around their filesystem for it.
  9201. - Provide dire warnings to any users who set DirServer manually;
  9202. move it out of torrc.sample and into torrc.complete.
  9203. - Make the log message less scary when all the dirservers are
  9204. temporarily unreachable.
  9205. - When tor_socketpair() fails in Windows, give a reasonable
  9206. Windows-style errno back.
  9207. - Improve tor_gettimeofday() granularity on windows.
  9208. - We were printing the number of idle dns workers incorrectly when
  9209. culling them.
  9210. - Handle duplicate lines in approved-routers files without warning.
  9211. - We were whining about using socks4 or socks5-with-local-lookup
  9212. even when it's an IP address in the "virtual" range we designed
  9213. exactly for this case.
  9214. - Check for named servers when looking them up by nickname;
  9215. warn when we're calling a non-named server by its nickname;
  9216. don't warn twice about the same name.
  9217. - Downgrade the dirserver log messages when whining about
  9218. unreachability.
  9219. - Correct "your server is reachable" log entries to indicate that
  9220. it was self-testing that told us so.
  9221. - If we're trying to be a Tor server and running Windows 95/98/ME
  9222. as a server, explain that we'll likely crash.
  9223. - Provide a more useful warn message when our onion queue gets full:
  9224. the CPU is too slow or the exit policy is too liberal.
  9225. - Don't warn when we receive a 503 from a dirserver/cache -- this
  9226. will pave the way for them being able to refuse if they're busy.
  9227. - When we fail to bind a listener, try to provide a more useful
  9228. log message: e.g., "Is Tor already running?"
  9229. - Only start testing reachability once we've established a
  9230. circuit. This will make startup on dir authorities less noisy.
  9231. - Don't try to upload hidden service descriptors until we have
  9232. established a circuit.
  9233. - Tor didn't warn when it failed to open a log file.
  9234. - Warn when listening on a public address for socks. We suspect a
  9235. lot of people are setting themselves up as open socks proxies,
  9236. and they have no idea that jerks on the Internet are using them,
  9237. since they simply proxy the traffic into the Tor network.
  9238. - Give a useful message when people run Tor as the wrong user,
  9239. rather than telling them to start chowning random directories.
  9240. - Fix a harmless bug that was causing Tor servers to log
  9241. "Got an end because of misc error, but we're not an AP. Closing."
  9242. - Fix wrong log message when you add a "HiddenServiceNodes" config
  9243. line without any HiddenServiceDir line (reported by Chris Thomas).
  9244. - Directory authorities now stop whining so loudly about bad
  9245. descriptors that they fetch from other dirservers. So when there's
  9246. a log complaint, it's for sure from a freshly uploaded descriptor.
  9247. - When logging via syslog, include the pid whenever we provide
  9248. a log entry. Suggested by Todd Fries.
  9249. - When we're shutting down and we do something like try to post a
  9250. server descriptor or rendezvous descriptor, don't complain that
  9251. we seem to be unreachable. Of course we are, we're shutting down.
  9252. - Change log line for unreachability to explicitly suggest /etc/hosts
  9253. as the culprit. Also make it clearer what IP address and ports we're
  9254. testing for reachability.
  9255. - Put quotes around user-supplied strings when logging so users are
  9256. more likely to realize if they add bad characters (like quotes)
  9257. to the torrc.
  9258. - NT service patch from Matt Edman to improve error messages on Win32.
  9259. Changes in version 0.1.0.17 - 2006-02-17
  9260. o Crash bugfixes on 0.1.0.x:
  9261. - When servers with a non-zero DirPort came out of hibernation,
  9262. sometimes they would trigger an assert.
  9263. o Other important bugfixes:
  9264. - On platforms that don't have getrlimit (like Windows), we were
  9265. artificially constraining ourselves to a max of 1024
  9266. connections. Now just assume that we can handle as many as 15000
  9267. connections. Hopefully this won't cause other problems.
  9268. o Backported features:
  9269. - When we're a server, a client asks for an old-style directory,
  9270. and our write bucket is empty, don't give it to him. This way
  9271. small servers can continue to serve the directory *sometimes*,
  9272. without getting overloaded.
  9273. - Whenever you get a 503 in response to a directory fetch, try
  9274. once more. This will become important once servers start sending
  9275. 503's whenever they feel busy.
  9276. - Fetch a new directory every 120 minutes, not every 40 minutes.
  9277. Now that we have hundreds of thousands of users running the old
  9278. directory algorithm, it's starting to hurt a lot.
  9279. - Bump up the period for forcing a hidden service descriptor upload
  9280. from 20 minutes to 1 hour.
  9281. Changes in version 0.1.0.16 - 2006-01-02
  9282. o Crash bugfixes on 0.1.0.x:
  9283. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  9284. corrupting the heap, losing FDs, or crashing when we need to resize
  9285. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  9286. - It turns out sparc64 platforms crash on unaligned memory access
  9287. too -- so detect and avoid this.
  9288. - Handle truncated compressed data correctly (by detecting it and
  9289. giving an error).
  9290. - Fix possible-but-unlikely free(NULL) in control.c.
  9291. - When we were closing connections, there was a rare case that
  9292. stomped on memory, triggering seg faults and asserts.
  9293. - Avoid potential infinite recursion when building a descriptor. (We
  9294. don't know that it ever happened, but better to fix it anyway.)
  9295. - We were neglecting to unlink marked circuits from soon-to-close OR
  9296. connections, which caused some rare scribbling on freed memory.
  9297. - Fix a memory stomping race bug when closing the joining point of two
  9298. rendezvous circuits.
  9299. - Fix an assert in time parsing found by Steven Murdoch.
  9300. o Other bugfixes on 0.1.0.x:
  9301. - When we're doing reachability testing, provide more useful log
  9302. messages so the operator knows what to expect.
  9303. - Do not check whether DirPort is reachable when we are suppressing
  9304. advertising it because of hibernation.
  9305. - When building with -static or on Solaris, we sometimes needed -ldl.
  9306. - One of the dirservers (tor26) changed its IP address.
  9307. - When we're deciding whether a stream has enough circuits around
  9308. that can handle it, count the freshly dirty ones and not the ones
  9309. that are so dirty they won't be able to handle it.
  9310. - When we're expiring old circuits, we had a logic error that caused
  9311. us to close new rendezvous circuits rather than old ones.
  9312. - Give a more helpful log message when you try to change ORPort via
  9313. the controller: you should upgrade Tor if you want that to work.
  9314. - We were failing to parse Tor versions that start with "Tor ".
  9315. - Tolerate faulty streams better: when a stream fails for reason
  9316. exitpolicy, stop assuming that the router is lying about his exit
  9317. policy. When a stream fails for reason misc, allow it to retry just
  9318. as if it was resolvefailed. When a stream has failed three times,
  9319. reset its failure count so we can try again and get all three tries.
  9320. Changes in version 0.1.0.15 - 2005-09-23
  9321. o Bugfixes on 0.1.0.x:
  9322. - Reject ports 465 and 587 (spam targets) in default exit policy.
  9323. - Don't crash when we don't have any spare file descriptors and we
  9324. try to spawn a dns or cpu worker.
  9325. - Get rid of IgnoreVersion undocumented config option, and make us
  9326. only warn, never exit, when we're running an obsolete version.
  9327. - Don't try to print a null string when your server finds itself to
  9328. be unreachable and the Address config option is empty.
  9329. - Make the numbers in read-history and write-history into uint64s,
  9330. so they don't overflow and publish negatives in the descriptor.
  9331. - Fix a minor memory leak in smartlist_string_remove().
  9332. - We were only allowing ourselves to upload a server descriptor at
  9333. most every 20 minutes, even if it changed earlier than that.
  9334. - Clean up log entries that pointed to old URLs.
  9335. Changes in version 0.1.0.14 - 2005-08-08
  9336. o Bugfixes on 0.1.0.x:
  9337. - Fix the other half of the bug with crypto handshakes
  9338. (CVE-2005-2643).
  9339. - Fix an assert trigger if you send a 'signal term' via the
  9340. controller when it's listening for 'event info' messages.
  9341. Changes in version 0.1.0.13 - 2005-08-04
  9342. o Bugfixes on 0.1.0.x:
  9343. - Fix a critical bug in the security of our crypto handshakes.
  9344. - Fix a size_t underflow in smartlist_join_strings2() that made
  9345. it do bad things when you hand it an empty smartlist.
  9346. - Fix Windows installer to ship Tor license (thanks to Aphex for
  9347. pointing out this oversight) and put a link to the doc directory
  9348. in the start menu.
  9349. - Explicitly set no-unaligned-access for sparc: it turns out the
  9350. new gcc's let you compile broken code, but that doesn't make it
  9351. not-broken.
  9352. Changes in version 0.1.0.12 - 2005-07-18
  9353. o New directory servers:
  9354. - tor26 has changed IP address.
  9355. o Bugfixes on 0.1.0.x:
  9356. - Fix a possible double-free in tor_gzip_uncompress().
  9357. - When --disable-threads is set, do not search for or link against
  9358. pthreads libraries.
  9359. - Don't trigger an assert if an authoritative directory server
  9360. claims its dirport is 0.
  9361. - Fix bug with removing Tor as an NT service: some people were
  9362. getting "The service did not return an error." Thanks to Matt
  9363. Edman for the fix.
  9364. Changes in version 0.1.0.11 - 2005-06-30
  9365. o Bugfixes on 0.1.0.x:
  9366. - Fix major security bug: servers were disregarding their
  9367. exit policies if clients behaved unexpectedly.
  9368. - Make OS X init script check for missing argument, so we don't
  9369. confuse users who invoke it incorrectly.
  9370. - Fix a seg fault in "tor --hash-password foo".
  9371. - The MAPADDRESS control command was broken.
  9372. Changes in version 0.1.0.10 - 2005-06-14
  9373. o Fixes on Win32:
  9374. - Make NT services work and start on startup on Win32 (based on
  9375. patch by Matt Edman). See the FAQ entry for details.
  9376. - Make 'platform' string in descriptor more accurate for Win32
  9377. servers, so it's not just "unknown platform".
  9378. - REUSEADDR on normal platforms means you can rebind to the port
  9379. right after somebody else has let it go. But REUSEADDR on Win32
  9380. means you can bind to the port _even when somebody else already
  9381. has it bound_! So, don't do that on Win32.
  9382. - Clean up the log messages when starting on Win32 with no config
  9383. file.
  9384. - Allow seeding the RNG on Win32 even when you're not running as
  9385. Administrator. If seeding the RNG on Win32 fails, quit.
  9386. o Assert / crash bugs:
  9387. - Refuse relay cells that claim to have a length larger than the
  9388. maximum allowed. This prevents a potential attack that could read
  9389. arbitrary memory (e.g. keys) from an exit server's process
  9390. (CVE-2005-2050).
  9391. - If unofficial Tor clients connect and send weird TLS certs, our
  9392. Tor server triggers an assert. Stop asserting, and start handling
  9393. TLS errors better in other situations too.
  9394. - Fix a race condition that can trigger an assert when we have a
  9395. pending create cell and an OR connection attempt fails.
  9396. o Resource leaks:
  9397. - Use pthreads for worker processes rather than forking. This was
  9398. forced because when we forked, we ended up wasting a lot of
  9399. duplicate ram over time.
  9400. - Also switch to foo_r versions of some library calls to allow
  9401. reentry and threadsafeness.
  9402. - Implement --disable-threads configure option. Disable threads on
  9403. netbsd and openbsd by default, because they have no reentrant
  9404. resolver functions (!), and on solaris since it has other
  9405. threading issues.
  9406. - Fix possible bug on threading platforms (e.g. win32) which was
  9407. leaking a file descriptor whenever a cpuworker or dnsworker died.
  9408. - Fix a minor memory leak when somebody establishes an introduction
  9409. point at your Tor server.
  9410. - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
  9411. Adam Langley.)
  9412. - Add ./configure --with-dmalloc option, to track memory leaks.
  9413. - And try to free all memory on closing, so we can detect what
  9414. we're leaking.
  9415. o Protocol correctness:
  9416. - When we've connected to an OR and handshaked but didn't like
  9417. the result, we were closing the conn without sending destroy
  9418. cells back for pending circuits. Now send those destroys.
  9419. - Start sending 'truncated' cells back rather than destroy cells
  9420. if the circuit closes in front of you. This means we won't have
  9421. to abandon partially built circuits.
  9422. - Handle changed router status correctly when dirserver reloads
  9423. fingerprint file. We used to be dropping all unverified descriptors
  9424. right then. The bug was hidden because we would immediately
  9425. fetch a directory from another dirserver, which would include the
  9426. descriptors we just dropped.
  9427. - Revise tor-spec to add more/better stream end reasons.
  9428. - Revise all calls to connection_edge_end to avoid sending 'misc',
  9429. and to take errno into account where possible.
  9430. - Client now retries when streams end early for 'hibernating' or
  9431. 'resource limit' reasons, rather than failing them.
  9432. - Try to be more zealous about calling connection_edge_end when
  9433. things go bad with edge conns in connection.c.
  9434. o Robustness improvements:
  9435. - Better handling for heterogeneous / unreliable nodes:
  9436. - Annotate circuits with whether they aim to contain high uptime
  9437. nodes and/or high capacity nodes. When building circuits, choose
  9438. appropriate nodes.
  9439. - This means that every single node in an intro rend circuit,
  9440. not just the last one, will have a minimum uptime.
  9441. - New config option LongLivedPorts to indicate application streams
  9442. that will want high uptime circuits.
  9443. - Servers reset uptime when a dir fetch entirely fails. This
  9444. hopefully reflects stability of the server's network connectivity.
  9445. - If somebody starts his tor server in Jan 2004 and then fixes his
  9446. clock, don't make his published uptime be a year.
  9447. - Reset published uptime when we wake up from hibernation.
  9448. - Introduce a notion of 'internal' circs, which are chosen without
  9449. regard to the exit policy of the last hop. Intro and rendezvous
  9450. circs must be internal circs, to avoid leaking information. Resolve
  9451. and connect streams can use internal circs if they want.
  9452. - New circuit pooling algorithm: keep track of what destination ports
  9453. we've used recently (start out assuming we'll want to use 80), and
  9454. make sure to have enough circs around to satisfy these ports. Also
  9455. make sure to have 2 internal circs around if we've required internal
  9456. circs lately (and with high uptime if we've seen that lately too).
  9457. - Turn addr_policy_compare from a tristate to a quadstate; this should
  9458. help address our "Ah, you allow 1.2.3.4:80. You are a good choice
  9459. for google.com" problem.
  9460. - When a client asks us for a dir mirror and we don't have one,
  9461. launch an attempt to get a fresh one.
  9462. - First cut at support for "create-fast" cells. Clients can use
  9463. these when extending to their first hop, since the TLS already
  9464. provides forward secrecy and authentication. Not enabled on
  9465. clients yet.
  9466. o Reachability testing.
  9467. - Your Tor server will automatically try to see if its ORPort and
  9468. DirPort are reachable from the outside, and it won't upload its
  9469. descriptor until it decides at least ORPort is reachable (when
  9470. DirPort is not yet found reachable, publish it as zero).
  9471. - When building testing circs for ORPort testing, use only
  9472. high-bandwidth nodes, so fewer circuits fail.
  9473. - Notice when our IP changes, and reset stats/uptime/reachability.
  9474. - Authdirservers don't do ORPort reachability detection, since
  9475. they're in clique mode, so it will be rare to find a server not
  9476. already connected to them.
  9477. - Authdirservers now automatically approve nodes running 0.1.0.2-rc
  9478. or later.
  9479. o Dirserver fixes:
  9480. - Now we allow two unverified servers with the same nickname
  9481. but different keys. But if a nickname is verified, only that
  9482. nickname+key are allowed.
  9483. - If you're an authdirserver connecting to an address:port,
  9484. and it's not the OR you were expecting, forget about that
  9485. descriptor. If he *was* the one you were expecting, then forget
  9486. about all other descriptors for that address:port.
  9487. - Allow servers to publish descriptors from 12 hours in the future.
  9488. Corollary: only whine about clock skew from the dirserver if
  9489. he's a trusted dirserver (since now even verified servers could
  9490. have quite wrong clocks).
  9491. - Require servers that use the default dirservers to have public IP
  9492. addresses. We have too many servers that are configured with private
  9493. IPs and their admins never notice the log entries complaining that
  9494. their descriptors are being rejected.
  9495. o Efficiency improvements:
  9496. - Use libevent. Now we can use faster async cores (like epoll, kpoll,
  9497. and /dev/poll), and hopefully work better on Windows too.
  9498. - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
  9499. kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
  9500. - Find libevent even if it's hiding in /usr/local/ and your
  9501. CFLAGS and LDFLAGS don't tell you to look there.
  9502. - Be able to link with libevent as a shared library (the default
  9503. after 1.0d), even if it's hiding in /usr/local/lib and even
  9504. if you haven't added /usr/local/lib to your /etc/ld.so.conf,
  9505. assuming you're running gcc. Otherwise fail and give a useful
  9506. error message.
  9507. - Switch to a new buffer management algorithm, which tries to avoid
  9508. reallocing and copying quite as much. In first tests it looks like
  9509. it uses *more* memory on average, but less cpu.
  9510. - Switch our internal buffers implementation to use a ring buffer,
  9511. to hopefully improve performance for fast servers a lot.
  9512. - Reenable the part of the code that tries to flush as soon as an
  9513. OR outbuf has a full TLS record available. Perhaps this will make
  9514. OR outbufs not grow as huge except in rare cases, thus saving lots
  9515. of CPU time plus memory.
  9516. - Improve performance for dirservers: stop re-parsing the whole
  9517. directory every time you regenerate it.
  9518. - Keep a big splay tree of (circid,orconn)->circuit mappings to make
  9519. it much faster to look up a circuit for each relay cell.
  9520. - Remove most calls to assert_all_pending_dns_resolves_ok(),
  9521. since they're eating our cpu on exit nodes.
  9522. - Stop wasting time doing a case insensitive comparison for every
  9523. dns name every time we do any lookup. Canonicalize the names to
  9524. lowercase when you first see them.
  9525. o Hidden services:
  9526. - Handle unavailable hidden services better. Handle slow or busy
  9527. hidden services better.
  9528. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
  9529. circ as necessary, if there are any completed ones lying around
  9530. when we try to launch one.
  9531. - Make hidden services try to establish a rendezvous for 30 seconds
  9532. after fetching the descriptor, rather than for n (where n=3)
  9533. attempts to build a circuit.
  9534. - Adjust maximum skew and age for rendezvous descriptors: let skew
  9535. be 48 hours rather than 90 minutes.
  9536. - Reject malformed .onion addresses rather then passing them on as
  9537. normal web requests.
  9538. o Controller:
  9539. - More Tor controller support. See
  9540. http://tor.eff.org/doc/control-spec.txt for all the new features,
  9541. including signals to emulate unix signals from any platform;
  9542. redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
  9543. closestream; closecircuit; etc.
  9544. - Encode hashed controller passwords in hex instead of base64,
  9545. to make it easier to write controllers.
  9546. - Revise control spec and implementation to allow all log messages to
  9547. be sent to controller with their severities intact (suggested by
  9548. Matt Edman). Disable debug-level logs while delivering a debug-level
  9549. log to the controller, to prevent loop. Update TorControl to handle
  9550. new log event types.
  9551. o New config options/defaults:
  9552. - Begin scrubbing sensitive strings from logs by default. Turn off
  9553. the config option SafeLogging if you need to do debugging.
  9554. - New exit policy: accept most low-numbered ports, rather than
  9555. rejecting most low-numbered ports.
  9556. - Put a note in the torrc about abuse potential with the default
  9557. exit policy.
  9558. - Add support for CONNECTing through https proxies, with "HttpsProxy"
  9559. config option.
  9560. - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
  9561. based on patch from Adam Langley (basic auth only).
  9562. - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
  9563. the fast servers that have been joining lately. (Clients are now
  9564. willing to load balance over up to 2 MB of advertised bandwidth
  9565. capacity too.)
  9566. - New config option MaxAdvertisedBandwidth which lets you advertise
  9567. a low bandwidthrate (to not attract as many circuits) while still
  9568. allowing a higher bandwidthrate in reality.
  9569. - Require BandwidthRate to be at least 20kB/s for servers.
  9570. - Add a NoPublish config option, so you can be a server (e.g. for
  9571. testing running Tor servers in other Tor networks) without
  9572. publishing your descriptor to the primary dirservers.
  9573. - Add a new AddressMap config directive to rewrite incoming socks
  9574. addresses. This lets you, for example, declare an implicit
  9575. required exit node for certain sites.
  9576. - Add a new TrackHostExits config directive to trigger addressmaps
  9577. for certain incoming socks addresses -- for sites that break when
  9578. your exit keeps changing (based on patch from Mike Perry).
  9579. - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
  9580. which describes how often we retry making new circuits if current
  9581. ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
  9582. how long we're willing to make use of an already-dirty circuit.
  9583. - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
  9584. a config option "ShutdownWaitLength" (when using kill -INT on
  9585. servers).
  9586. - Fix an edge case in parsing config options: if they say "--"
  9587. on the commandline, it's not a config option (thanks weasel).
  9588. - New config option DirAllowPrivateAddresses for authdirservers.
  9589. Now by default they refuse router descriptors that have non-IP or
  9590. private-IP addresses.
  9591. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
  9592. smart" default value: low for servers and high for clients.
  9593. - Some people were putting "Address " in their torrc, and they had
  9594. a buggy resolver that resolved " " to 0.0.0.0. Oops.
  9595. - If DataDir is ~/.tor, and that expands to /.tor, then default to
  9596. LOCALSTATEDIR/tor instead.
  9597. - Implement --verify-config command-line option to check if your torrc
  9598. is valid without actually launching Tor.
  9599. o Logging improvements:
  9600. - When dirservers refuse a server descriptor, we now log its
  9601. contactinfo, platform, and the poster's IP address.
  9602. - Only warn once per nickname from add_nickname_list_to_smartlist()
  9603. per failure, so an entrynode or exitnode choice that's down won't
  9604. yell so much.
  9605. - When we're connecting to an OR and he's got a different nickname/key
  9606. than we were expecting, only complain loudly if we're an OP or a
  9607. dirserver. Complaining loudly to the OR admins just confuses them.
  9608. - Whine at you if you're a server and you don't set your contactinfo.
  9609. - Warn when exit policy implicitly allows local addresses.
  9610. - Give a better warning when some other server advertises an
  9611. ORPort that is actually an apache running ssl.
  9612. - If we get an incredibly skewed timestamp from a dirserver mirror
  9613. that isn't a verified OR, don't warn -- it's probably him that's
  9614. wrong.
  9615. - When a dirserver causes you to give a warn, mention which dirserver
  9616. it was.
  9617. - Initialize libevent later in the startup process, so the logs are
  9618. already established by the time we start logging libevent warns.
  9619. - Use correct errno on win32 if libevent fails.
  9620. - Check and warn about known-bad/slow libevent versions.
  9621. - Stop warning about sigpipes in the logs. We're going to
  9622. pretend that getting these occassionally is normal and fine.
  9623. o New contrib scripts:
  9624. - New experimental script tor/contrib/exitlist: a simple python
  9625. script to parse directories and find Tor nodes that exit to listed
  9626. addresses/ports.
  9627. - New experimental script tor/contrib/ExerciseServer.py (needs more
  9628. work) that uses the controller interface to build circuits and
  9629. fetch pages over them. This will help us bootstrap servers that
  9630. have lots of capacity but haven't noticed it yet.
  9631. - New experimental script tor/contrib/PathDemo.py (needs more work)
  9632. that uses the controller interface to let you choose whole paths
  9633. via addresses like
  9634. "<hostname>.<path,separated by dots>.<length of path>.path"
  9635. - New contributed script "privoxy-tor-toggle" to toggle whether
  9636. Privoxy uses Tor. Seems to be configured for Debian by default.
  9637. - Have torctl.in/tor.sh.in check for location of su binary (needed
  9638. on FreeBSD)
  9639. o Misc bugfixes:
  9640. - chdir() to your datadirectory at the *end* of the daemonize process,
  9641. not the beginning. This was a problem because the first time you
  9642. run tor, if your datadir isn't there, and you have runasdaemon set
  9643. to 1, it will try to chdir to it before it tries to create it. Oops.
  9644. - Fix several double-mark-for-close bugs, e.g. where we were finding
  9645. a conn for a cell even if that conn is already marked for close.
  9646. - Stop most cases of hanging up on a socks connection without sending
  9647. the socks reject.
  9648. - Fix a bug in the RPM package: set home directory for _tor to
  9649. something more reasonable when first installing.
  9650. - Stop putting nodename in the Platform string in server descriptors.
  9651. It doesn't actually help, and it is confusing/upsetting some people.
  9652. - When using preferred entry or exit nodes, ignore whether the
  9653. circuit wants uptime or capacity. They asked for the nodes, they
  9654. get the nodes.
  9655. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
  9656. artificially capped at 500kB.
  9657. - Cache local dns resolves correctly even when they're .exit
  9658. addresses.
  9659. - If we're hibernating and we get a SIGINT, exit immediately.
  9660. - tor-resolve requests were ignoring .exit if there was a working circuit
  9661. they could use instead.
  9662. - Pay more attention to the ClientOnly config option.
  9663. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
  9664. installer screens; and don't put stuff into StartupItems unless
  9665. the user asks you to.
  9666. o Misc features:
  9667. - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
  9668. rather than just rejecting it.
  9669. - If our clock jumps forward by 100 seconds or more, assume something
  9670. has gone wrong with our network and abandon all not-yet-used circs.
  9671. - When an application is using socks5, give him the whole variety of
  9672. potential socks5 responses (connect refused, host unreachable, etc),
  9673. rather than just "success" or "failure".
  9674. - A more sane version numbering system. See
  9675. http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
  9676. - Change version parsing logic: a version is "obsolete" if it is not
  9677. recommended and (1) there is a newer recommended version in the
  9678. same series, or (2) there are no recommended versions in the same
  9679. series, but there are some recommended versions in a newer series.
  9680. A version is "new" if it is newer than any recommended version in
  9681. the same series.
  9682. - Report HTTP reasons to client when getting a response from directory
  9683. servers -- so you can actually know what went wrong.
  9684. - Reject odd-looking addresses at the client (e.g. addresses that
  9685. contain a colon), rather than having the server drop them because
  9686. they're malformed.
  9687. - Stop publishing socksport in the directory, since it's not
  9688. actually meant to be public. For compatibility, publish a 0 there
  9689. for now.
  9690. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
  9691. cookies to disk and doesn't log each web request to disk. (Thanks
  9692. to Brett Carrington for pointing this out.)
  9693. - Add OSX uninstall instructions. An actual uninstall script will
  9694. come later.
  9695. - Add "opt hibernating 1" to server descriptor to make it clearer
  9696. whether the server is hibernating.
  9697. Changes in version 0.0.9.10 - 2005-06-16
  9698. o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
  9699. - Refuse relay cells that claim to have a length larger than the
  9700. maximum allowed. This prevents a potential attack that could read
  9701. arbitrary memory (e.g. keys) from an exit server's process
  9702. (CVE-2005-2050).
  9703. Changes in version 0.0.9.9 - 2005-04-23
  9704. o Bugfixes on 0.0.9.x:
  9705. - If unofficial Tor clients connect and send weird TLS certs, our
  9706. Tor server triggers an assert. This release contains a minimal
  9707. backport from the broader fix that we put into 0.1.0.4-rc.
  9708. Changes in version 0.0.9.8 - 2005-04-07
  9709. o Bugfixes on 0.0.9.x:
  9710. - We have a bug that I haven't found yet. Sometimes, very rarely,
  9711. cpuworkers get stuck in the 'busy' state, even though the cpuworker
  9712. thinks of itself as idle. This meant that no new circuits ever got
  9713. established. Here's a workaround to kill any cpuworker that's been
  9714. busy for more than 100 seconds.
  9715. Changes in version 0.0.9.7 - 2005-04-01
  9716. o Bugfixes on 0.0.9.x:
  9717. - Fix another race crash bug (thanks to Glenn Fink for reporting).
  9718. - Compare identity to identity, not to nickname, when extending to
  9719. a router not already in the directory. This was preventing us from
  9720. extending to unknown routers. Oops.
  9721. - Make sure to create OS X Tor user in <500 range, so we aren't
  9722. creating actual system users.
  9723. - Note where connection-that-hasn't-sent-end was marked, and fix
  9724. a few really loud instances of this harmless bug (it's fixed more
  9725. in 0.1.0.x).
  9726. Changes in version 0.0.9.6 - 2005-03-24
  9727. o Bugfixes on 0.0.9.x (crashes and asserts):
  9728. - Add new end stream reasons to maintainance branch. Fix bug where
  9729. reason (8) could trigger an assert. Prevent bug from recurring.
  9730. - Apparently win32 stat wants paths to not end with a slash.
  9731. - Fix assert triggers in assert_cpath_layer_ok(), where we were
  9732. blowing away the circuit that conn->cpath_layer points to, then
  9733. checking to see if the circ is well-formed. Backport check to make
  9734. sure we dont use the cpath on a closed connection.
  9735. - Prevent circuit_resume_edge_reading_helper() from trying to package
  9736. inbufs for marked-for-close streams.
  9737. - Don't crash on hup if your options->address has become unresolvable.
  9738. - Some systems (like OS X) sometimes accept() a connection and tell
  9739. you the remote host is 0.0.0.0:0. If this happens, due to some
  9740. other mis-features, we get confused; so refuse the conn for now.
  9741. o Bugfixes on 0.0.9.x (other):
  9742. - Fix harmless but scary "Unrecognized content encoding" warn message.
  9743. - Add new stream error reason: TORPROTOCOL reason means "you are not
  9744. speaking a version of Tor I understand; say bye-bye to your stream."
  9745. - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
  9746. into the future, now that we are more tolerant of skew. This
  9747. resolves a bug where a Tor server would refuse to cache a directory
  9748. because all the directories it gets are too far in the future;
  9749. yet the Tor server never logs any complaints about clock skew.
  9750. - Mac packaging magic: make man pages useable, and do not overwrite
  9751. existing torrc files.
  9752. - Make OS X log happily to /var/log/tor/tor.log
  9753. Changes in version 0.0.9.5 - 2005-02-22
  9754. o Bugfixes on 0.0.9.x:
  9755. - Fix an assert race at exit nodes when resolve requests fail.
  9756. - Stop picking unverified dir mirrors--it only leads to misery.
  9757. - Patch from Matt Edman to make NT services work better. Service
  9758. support is still not compiled into the executable by default.
  9759. - Patch from Dmitri Bely so the Tor service runs better under
  9760. the win32 SYSTEM account.
  9761. - Make tor-resolve actually work (?) on Win32.
  9762. - Fix a sign bug when getrlimit claims to have 4+ billion
  9763. file descriptors available.
  9764. - Stop refusing to start when bandwidthburst == bandwidthrate.
  9765. - When create cells have been on the onion queue more than five
  9766. seconds, just send back a destroy and take them off the list.
  9767. Changes in version 0.0.9.4 - 2005-02-03
  9768. o Bugfixes on 0.0.9:
  9769. - Fix an assert bug that took down most of our servers: when
  9770. a server claims to have 1 GB of bandwidthburst, don't
  9771. freak out.
  9772. - Don't crash as badly if we have spawned the max allowed number
  9773. of dnsworkers, or we're out of file descriptors.
  9774. - Block more file-sharing ports in the default exit policy.
  9775. - MaxConn is now automatically set to the hard limit of max
  9776. file descriptors we're allowed (ulimit -n), minus a few for
  9777. logs, etc.
  9778. - Give a clearer message when servers need to raise their
  9779. ulimit -n when they start running out of file descriptors.
  9780. - SGI Compatibility patches from Jan Schaumann.
  9781. - Tolerate a corrupt cached directory better.
  9782. - When a dirserver hasn't approved your server, list which one.
  9783. - Go into soft hibernation after 95% of the bandwidth is used,
  9784. not 99%. This is especially important for daily hibernators who
  9785. have a small accounting max. Hopefully it will result in fewer
  9786. cut connections when the hard hibernation starts.
  9787. - Load-balance better when using servers that claim more than
  9788. 800kB/s of capacity.
  9789. - Make NT services work (experimental, only used if compiled in).
  9790. Changes in version 0.0.9.3 - 2005-01-21
  9791. o Bugfixes on 0.0.9:
  9792. - Backport the cpu use fixes from main branch, so busy servers won't
  9793. need as much processor time.
  9794. - Work better when we go offline and then come back, or when we
  9795. run Tor at boot before the network is up. We do this by
  9796. optimistically trying to fetch a new directory whenever an
  9797. application request comes in and we think we're offline -- the
  9798. human is hopefully a good measure of when the network is back.
  9799. - Backport some minimal hidserv bugfixes: keep rend circuits open as
  9800. long as you keep using them; actually publish hidserv descriptors
  9801. shortly after they change, rather than waiting 20-40 minutes.
  9802. - Enable Mac startup script by default.
  9803. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
  9804. - When you update AllowUnverifiedNodes or FirewallPorts via the
  9805. controller's setconf feature, we were always appending, never
  9806. resetting.
  9807. - When you update HiddenServiceDir via setconf, it was screwing up
  9808. the order of reading the lines, making it fail.
  9809. - Do not rewrite a cached directory back to the cache; otherwise we
  9810. will think it is recent and not fetch a newer one on startup.
  9811. - Workaround for webservers that lie about Content-Encoding: Tor
  9812. now tries to autodetect compressed directories and compression
  9813. itself. This lets us Proxypass dir fetches through apache.
  9814. Changes in version 0.0.9.2 - 2005-01-04
  9815. o Bugfixes on 0.0.9 (crashes and asserts):
  9816. - Fix an assert on startup when the disk is full and you're logging
  9817. to a file.
  9818. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
  9819. style address, then we'd crash.
  9820. - Fix an assert trigger when the running-routers string we get from
  9821. a dirserver is broken.
  9822. - Make worker threads start and run on win32. Now win32 servers
  9823. may work better.
  9824. - Bandaid (not actually fix, but now it doesn't crash) an assert
  9825. where the dns worker dies mysteriously and the main Tor process
  9826. doesn't remember anything about the address it was resolving.
  9827. o Bugfixes on 0.0.9 (Win32):
  9828. - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
  9829. name out of the warning/assert messages.
  9830. - Fix a superficial "unhandled error on read" bug on win32.
  9831. - The win32 installer no longer requires a click-through for our
  9832. license, since our Free Software license grants rights but does not
  9833. take any away.
  9834. - Win32: When connecting to a dirserver fails, try another one
  9835. immediately. (This was already working for non-win32 Tors.)
  9836. - Stop trying to parse $HOME on win32 when hunting for default
  9837. DataDirectory.
  9838. - Make tor-resolve.c work on win32 by calling network_init().
  9839. o Bugfixes on 0.0.9 (other):
  9840. - Make 0.0.9.x build on Solaris again.
  9841. - Due to a fencepost error, we were blowing away the \n when reporting
  9842. confvalue items in the controller. So asking for multiple config
  9843. values at once couldn't work.
  9844. - When listing circuits that are pending on an opening OR connection,
  9845. if we're an OR we were listing circuits that *end* at us as
  9846. being pending on every listener, dns/cpu worker, etc. Stop that.
  9847. - Dirservers were failing to create 'running-routers' or 'directory'
  9848. strings if we had more than some threshold of routers. Fix them so
  9849. they can handle any number of routers.
  9850. - Fix a superficial "Duplicate mark for close" bug.
  9851. - Stop checking for clock skew for OR connections, even for servers.
  9852. - Fix a fencepost error that was chopping off the last letter of any
  9853. nickname that is the maximum allowed nickname length.
  9854. - Update URLs in log messages so they point to the new website.
  9855. - Fix a potential problem in mangling server private keys while
  9856. writing to disk (not triggered yet, as far as we know).
  9857. - Include the licenses for other free software we include in Tor,
  9858. now that we're shipping binary distributions more regularly.
  9859. Changes in version 0.0.9.1 - 2004-12-15
  9860. o Bugfixes on 0.0.9:
  9861. - Make hibernation actually work.
  9862. - Make HashedControlPassword config option work.
  9863. - When we're reporting event circuit status to a controller,
  9864. don't use the stream status code.
  9865. Changes in version 0.0.9 - 2004-12-12
  9866. o Bugfixes on 0.0.8.1 (Crashes and asserts):
  9867. - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
  9868. write() call will fail and we handle it there.
  9869. - When we run out of disk space, or other log writing error, don't
  9870. crash. Just stop logging to that log and continue.
  9871. - Fix isspace() and friends so they still make Solaris happy
  9872. but also so they don't trigger asserts on win32.
  9873. - Fix assert failure on malformed socks4a requests.
  9874. - Fix an assert bug where a hidden service provider would fail if
  9875. the first hop of his rendezvous circuit was down.
  9876. - Better handling of size_t vs int, so we're more robust on 64
  9877. bit platforms.
  9878. o Bugfixes on 0.0.8.1 (Win32):
  9879. - Make windows sockets actually non-blocking (oops), and handle
  9880. win32 socket errors better.
  9881. - Fix parse_iso_time on platforms without strptime (eg win32).
  9882. - win32: when being multithreaded, leave parent fdarray open.
  9883. - Better handling of winsock includes on non-MSV win32 compilers.
  9884. - Change our file IO stuff (especially wrt OpenSSL) so win32 is
  9885. happier.
  9886. - Make unit tests work on win32.
  9887. o Bugfixes on 0.0.8.1 (Path selection and streams):
  9888. - Calculate timeout for waiting for a connected cell from the time
  9889. we sent the begin cell, not from the time the stream started. If
  9890. it took a long time to establish the circuit, we would time out
  9891. right after sending the begin cell.
  9892. - Fix router_compare_addr_to_addr_policy: it was not treating a port
  9893. of * as always matching, so we were picking reject *:* nodes as
  9894. exit nodes too. Oops.
  9895. - When read() failed on a stream, we would close it without sending
  9896. back an end. So 'connection refused' would simply be ignored and
  9897. the user would get no response.
  9898. - Stop a sigpipe: when an 'end' cell races with eof from the app,
  9899. we shouldn't hold-open-until-flush if the eof arrived first.
  9900. - Let resolve conns retry/expire also, rather than sticking around
  9901. forever.
  9902. - Fix more dns related bugs: send back resolve_failed and end cells
  9903. more reliably when the resolve fails, rather than closing the
  9904. circuit and then trying to send the cell. Also attach dummy resolve
  9905. connections to a circuit *before* calling dns_resolve(), to fix
  9906. a bug where cached answers would never be sent in RESOLVED cells.
  9907. o Bugfixes on 0.0.8.1 (Circuits):
  9908. - Finally fix a bug that's been plaguing us for a year:
  9909. With high load, circuit package window was reaching 0. Whenever
  9910. we got a circuit-level sendme, we were reading a lot on each
  9911. socket, but only writing out a bit. So we would eventually reach
  9912. eof. This would be noticed and acted on even when there were still
  9913. bytes sitting in the inbuf.
  9914. - Use identity comparison, not nickname comparison, to choose which
  9915. half of circuit-ID-space each side gets to use. This is needed
  9916. because sometimes we think of a router as a nickname, and sometimes
  9917. as a hex ID, and we can't predict what the other side will do.
  9918. o Bugfixes on 0.0.8.1 (Other):
  9919. - Fix a whole slew of memory leaks.
  9920. - Disallow NDEBUG. We don't ever want anybody to turn off debug.
  9921. - If we are using select, make sure we stay within FD_SETSIZE.
  9922. - When poll() is interrupted, we shouldn't believe the revents values.
  9923. - Add a FAST_SMARTLIST define to optionally inline smartlist_get
  9924. and smartlist_len, which are two major profiling offenders.
  9925. - If do_hup fails, actually notice.
  9926. - Flush the log file descriptor after we print "Tor opening log file",
  9927. so we don't see those messages days later.
  9928. - Hidden service operators now correctly handle version 1 style
  9929. INTRODUCE1 cells (nobody generates them still, so not a critical
  9930. bug).
  9931. - Handle more errnos from accept() without closing the listener.
  9932. Some OpenBSD machines were closing their listeners because
  9933. they ran out of file descriptors.
  9934. - Some people had wrapped their tor client/server in a script
  9935. that would restart it whenever it died. This did not play well
  9936. with our "shut down if your version is obsolete" code. Now people
  9937. don't fetch a new directory if their local cached version is
  9938. recent enough.
  9939. - Make our autogen.sh work on ksh as well as bash.
  9940. - Better torrc example lines for dirbindaddress and orbindaddress.
  9941. - Improved bounds checking on parsed ints (e.g. config options and
  9942. the ones we find in directories.)
  9943. - Stop using separate defaults for no-config-file and
  9944. empty-config-file. Now you have to explicitly turn off SocksPort,
  9945. if you don't want it open.
  9946. - We were starting to daemonize before we opened our logs, so if
  9947. there were any problems opening logs, we would complain to stderr,
  9948. which wouldn't work, and then mysteriously exit.
  9949. - If a verified OR connects to us before he's uploaded his descriptor,
  9950. or we verify him and hup but he still has the original TLS
  9951. connection, then conn->nickname is still set like he's unverified.
  9952. o Code security improvements, inspired by Ilja:
  9953. - tor_snprintf wrapper over snprintf with consistent (though not C99)
  9954. overflow behavior.
  9955. - Replace sprintf with tor_snprintf. (I think they were all safe, but
  9956. hey.)
  9957. - Replace strcpy/strncpy with strlcpy in more places.
  9958. - Avoid strcat; use tor_snprintf or strlcat instead.
  9959. o Features (circuits and streams):
  9960. - New circuit building strategy: keep a list of ports that we've
  9961. used in the past 6 hours, and always try to have 2 circuits open
  9962. or on the way that will handle each such port. Seed us with port
  9963. 80 so web users won't complain that Tor is "slow to start up".
  9964. - Make kill -USR1 dump more useful stats about circuits.
  9965. - When warning about retrying or giving up, print the address, so
  9966. the user knows which one it's talking about.
  9967. - If you haven't used a clean circuit in an hour, throw it away,
  9968. just to be on the safe side. (This means after 6 hours a totally
  9969. unused Tor client will have no circuits open.)
  9970. - Support "foo.nickname.exit" addresses, to let Alice request the
  9971. address "foo" as viewed by exit node "nickname". Based on a patch
  9972. from Geoff Goodell.
  9973. - If your requested entry or exit node has advertised bandwidth 0,
  9974. pick it anyway.
  9975. - Be more greedy about filling up relay cells -- we try reading again
  9976. once we've processed the stuff we read, in case enough has arrived
  9977. to fill the last cell completely.
  9978. - Refuse application socks connections to port 0.
  9979. - Use only 0.0.9pre1 and later servers for resolve cells.
  9980. o Features (bandwidth):
  9981. - Hibernation: New config option "AccountingMax" lets you
  9982. set how many bytes per month (in each direction) you want to
  9983. allow your server to consume. Rather than spreading those
  9984. bytes out evenly over the month, we instead hibernate for some
  9985. of the month and pop up at a deterministic time, work until
  9986. the bytes are consumed, then hibernate again. Config option
  9987. "MonthlyAccountingStart" lets you specify which day of the month
  9988. your billing cycle starts on.
  9989. - Implement weekly/monthly/daily accounting: now you specify your
  9990. hibernation properties by
  9991. AccountingMax N bytes|KB|MB|GB|TB
  9992. AccountingStart day|week|month [day] HH:MM
  9993. Defaults to "month 1 0:00".
  9994. - Let bandwidth and interval config options be specified as 5 bytes,
  9995. kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
  9996. o Features (directories):
  9997. - New "router-status" line in directory, to better bind each verified
  9998. nickname to its identity key.
  9999. - Clients can ask dirservers for /dir.z to get a compressed version
  10000. of the directory. Only works for servers running 0.0.9, of course.
  10001. - Make clients cache directories and use them to seed their router
  10002. lists at startup. This means clients have a datadir again.
  10003. - Respond to content-encoding headers by trying to uncompress as
  10004. appropriate.
  10005. - Clients and servers now fetch running-routers; cache
  10006. running-routers; compress running-routers; serve compressed
  10007. running-routers.z
  10008. - Make moria2 advertise a dirport of 80, so people behind firewalls
  10009. will be able to get a directory.
  10010. - Http proxy support
  10011. - Dirservers translate requests for http://%s:%d/x to /x
  10012. - You can specify "HttpProxy %s[:%d]" and all dir fetches will
  10013. be routed through this host.
  10014. - Clients ask for /tor/x rather than /x for new enough dirservers.
  10015. This way we can one day coexist peacefully with apache.
  10016. - Clients specify a "Host: %s%d" http header, to be compatible
  10017. with more proxies, and so running squid on an exit node can work.
  10018. - Protect dirservers from overzealous descriptor uploading -- wait
  10019. 10 seconds after directory gets dirty, before regenerating.
  10020. o Features (packages and install):
  10021. - Add NSI installer contributed by J Doe.
  10022. - Apply NT service patch from Osamu Fujino. Still needs more work.
  10023. - Commit VC6 and VC7 workspace/project files.
  10024. - Commit a tor.spec for making RPM files, with help from jbash.
  10025. - Add contrib/torctl.in contributed by Glenn Fink.
  10026. - Make expand_filename handle ~ and ~username.
  10027. - Use autoconf to enable largefile support where necessary. Use
  10028. ftello where available, since ftell can fail at 2GB.
  10029. - Ship src/win32/ in the tarball, so people can use it to build.
  10030. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
  10031. is broken.
  10032. o Features (ui controller):
  10033. - Control interface: a separate program can now talk to your
  10034. client/server over a socket, and get/set config options, receive
  10035. notifications of circuits and streams starting/finishing/dying,
  10036. bandwidth used, etc. The next step is to get some GUIs working.
  10037. Let us know if you want to help out. See doc/control-spec.txt .
  10038. - Ship a contrib/tor-control.py as an example script to interact
  10039. with the control port.
  10040. - "tor --hash-password zzyxz" will output a salted password for
  10041. use in authenticating to the control interface.
  10042. - Implement the control-spec's SAVECONF command, to write your
  10043. configuration to torrc.
  10044. - Get cookie authentication for the controller closer to working.
  10045. - When set_conf changes our server descriptor, upload a new copy.
  10046. But don't upload it too often if there are frequent changes.
  10047. o Features (config and command-line):
  10048. - Deprecate unofficial config option abbreviations, and abbreviations
  10049. not on the command line.
  10050. - Configuration infrastructure support for warning on obsolete
  10051. options.
  10052. - Give a slightly more useful output for "tor -h".
  10053. - Break DirFetchPostPeriod into:
  10054. - DirFetchPeriod for fetching full directory,
  10055. - StatusFetchPeriod for fetching running-routers,
  10056. - DirPostPeriod for posting server descriptor,
  10057. - RendPostPeriod for posting hidden service descriptors.
  10058. - New log format in config:
  10059. "Log minsev[-maxsev] stdout|stderr|syslog" or
  10060. "Log minsev[-maxsev] file /var/foo"
  10061. - DirPolicy config option, to let people reject incoming addresses
  10062. from their dirserver.
  10063. - "tor --list-fingerprint" will list your identity key fingerprint
  10064. and then exit.
  10065. - Make tor --version --version dump the cvs Id of every file.
  10066. - New 'MyFamily nick1,...' config option for a server to
  10067. specify other servers that shouldn't be used in the same circuit
  10068. with it. Only believed if nick1 also specifies us.
  10069. - New 'NodeFamily nick1,nick2,...' config option for a client to
  10070. specify nodes that it doesn't want to use in the same circuit.
  10071. - New 'Redirectexit pattern address:port' config option for a
  10072. server to redirect exit connections, e.g. to a local squid.
  10073. - Add "pass" target for RedirectExit, to make it easier to break
  10074. out of a sequence of RedirectExit rules.
  10075. - Make the dirservers file obsolete.
  10076. - Include a dir-signing-key token in directories to tell the
  10077. parsing entity which key is being used to sign.
  10078. - Remove the built-in bulky default dirservers string.
  10079. - New config option "Dirserver %s:%d [fingerprint]", which can be
  10080. repeated as many times as needed. If no dirservers specified,
  10081. default to moria1,moria2,tor26.
  10082. - Make 'Routerfile' config option obsolete.
  10083. - Discourage people from setting their dirfetchpostperiod more often
  10084. than once per minute.
  10085. o Features (other):
  10086. - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
  10087. get back to normal.)
  10088. - Accept *:706 (silc) in default exit policy.
  10089. - Implement new versioning format for post 0.1.
  10090. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
  10091. log more informatively.
  10092. - Check clock skew for verified servers, but allow unverified
  10093. servers and clients to have any clock skew.
  10094. - Make sure the hidden service descriptors are at a random offset
  10095. from each other, to hinder linkability.
  10096. - Clients now generate a TLS cert too, in preparation for having
  10097. them act more like real nodes.
  10098. - Add a pure-C tor-resolve implementation.
  10099. - Use getrlimit and friends to ensure we can reach MaxConn (currently
  10100. 1024) file descriptors.
  10101. - Raise the max dns workers from 50 to 100.
  10102. Changes in version 0.0.8.1 - 2004-10-13
  10103. o Bugfixes:
  10104. - Fix a seg fault that can be triggered remotely for Tor
  10105. clients/servers with an open dirport.
  10106. - Fix a rare assert trigger, where routerinfos for entries in
  10107. our cpath would expire while we're building the path.
  10108. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  10109. - Fix a rare seg fault for people running hidden services on
  10110. intermittent connections.
  10111. - Fix a bug in parsing opt keywords with objects.
  10112. - Fix a stale pointer assert bug when a stream detaches and
  10113. reattaches.
  10114. - Fix a string format vulnerability (probably not exploitable)
  10115. in reporting stats locally.
  10116. - Fix an assert trigger: sometimes launching circuits can fail
  10117. immediately, e.g. because too many circuits have failed recently.
  10118. - Fix a compile warning on 64 bit platforms.
  10119. Changes in version 0.0.8 - 2004-08-25
  10120. o Bugfixes:
  10121. - Made our unit tests compile again on OpenBSD 3.5, and tor
  10122. itself compile again on OpenBSD on a sparc64.
  10123. - We were neglecting milliseconds when logging on win32, so
  10124. everything appeared to happen at the beginning of each second.
  10125. - Check directory signature _before_ you decide whether you're
  10126. you're running an obsolete version and should exit.
  10127. - Check directory signature _before_ you parse the running-routers
  10128. list to decide who's running.
  10129. - Check return value of fclose while writing to disk, so we don't
  10130. end up with broken files when servers run out of disk space.
  10131. - Port it to SunOS 5.9 / Athena
  10132. - Fix two bugs in saving onion keys to disk when rotating, so
  10133. hopefully we'll get fewer people using old onion keys.
  10134. - Remove our mostly unused -- and broken -- hex_encode()
  10135. function. Use base16_encode() instead. (Thanks to Timo Lindfors
  10136. for pointing out this bug.)
  10137. - Only pick and establish intro points after we've gotten a
  10138. directory.
  10139. - Fix assert triggers: if the other side returns an address 0.0.0.0,
  10140. don't put it into the client dns cache.
  10141. - If a begin failed due to exit policy, but we believe the IP
  10142. address should have been allowed, switch that router to exitpolicy
  10143. reject *:* until we get our next directory.
  10144. o Protocol changes:
  10145. - 'Extend' relay cell payloads now include the digest of the
  10146. intended next hop's identity key. Now we can verify that we're
  10147. extending to the right router, and also extend to routers we
  10148. hadn't heard of before.
  10149. o Features:
  10150. - Tor nodes can now act as relays (with an advertised ORPort)
  10151. without being manually verified by the dirserver operators.
  10152. - Uploaded descriptors of unverified routers are now accepted
  10153. by the dirservers, and included in the directory.
  10154. - Verified routers are listed by nickname in the running-routers
  10155. list; unverified routers are listed as "$<fingerprint>".
  10156. - We now use hash-of-identity-key in most places rather than
  10157. nickname or addr:port, for improved security/flexibility.
  10158. - AllowUnverifiedNodes config option to let circuits choose no-name
  10159. routers in entry,middle,exit,introduction,rendezvous positions.
  10160. Allow middle and rendezvous positions by default.
  10161. - When picking unverified routers, skip those with low uptime and/or
  10162. low bandwidth, depending on what properties you care about.
  10163. - ClientOnly option for nodes that never want to become servers.
  10164. - Directory caching.
  10165. - "AuthoritativeDir 1" option for the official dirservers.
  10166. - Now other nodes (clients and servers) will cache the latest
  10167. directory they've pulled down.
  10168. - They can enable their DirPort to serve it to others.
  10169. - Clients will pull down a directory from any node with an open
  10170. DirPort, and check the signature/timestamp correctly.
  10171. - Authoritative dirservers now fetch directories from other
  10172. authdirservers, to stay better synced.
  10173. - Running-routers list tells who's down also, along with noting
  10174. if they're verified (listed by nickname) or unverified (listed
  10175. by hash-of-key).
  10176. - Allow dirservers to serve running-router list separately.
  10177. This isn't used yet.
  10178. - You can now fetch $DIRURL/running-routers to get just the
  10179. running-routers line, not the whole descriptor list. (But
  10180. clients don't use this yet.)
  10181. - Clients choose nodes proportional to advertised bandwidth.
  10182. - Clients avoid using nodes with low uptime as introduction points.
  10183. - Handle servers with dynamic IP addresses: don't just replace
  10184. options->Address with the resolved one at startup, and
  10185. detect our address right before we make a routerinfo each time.
  10186. - 'FascistFirewall' option to pick dirservers and ORs on specific
  10187. ports; plus 'FirewallPorts' config option to tell FascistFirewall
  10188. which ports are open. (Defaults to 80,443)
  10189. - Try other dirservers immediately if the one you try is down. This
  10190. should tolerate down dirservers better now.
  10191. - ORs connect-on-demand to other ORs
  10192. - If you get an extend cell to an OR you're not connected to,
  10193. connect, handshake, and forward the create cell.
  10194. - The authoritative dirservers stay connected to everybody,
  10195. and everybody stays connected to 0.0.7 servers, but otherwise
  10196. clients/servers expire unused connections after 5 minutes.
  10197. - When servers get a sigint, they delay 30 seconds (refusing new
  10198. connections) then exit. A second sigint causes immediate exit.
  10199. - File and name management:
  10200. - Look for .torrc if no CONFDIR "torrc" is found.
  10201. - If no datadir is defined, then choose, make, and secure ~/.tor
  10202. as datadir.
  10203. - If torrc not found, exitpolicy reject *:*.
  10204. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
  10205. - If no nickname is defined, derive default from hostname.
  10206. - Rename secret key files, e.g. identity.key -> secret_id_key,
  10207. to discourage people from mailing their identity key to tor-ops.
  10208. - Refuse to build a circuit before the directory has arrived --
  10209. it won't work anyway, since you won't know the right onion keys
  10210. to use.
  10211. - Parse tor version numbers so we can do an is-newer-than check
  10212. rather than an is-in-the-list check.
  10213. - New socks command 'resolve', to let us shim gethostbyname()
  10214. locally.
  10215. - A 'tor_resolve' script to access the socks resolve functionality.
  10216. - A new socks-extensions.txt doc file to describe our
  10217. interpretation and extensions to the socks protocols.
  10218. - Add a ContactInfo option, which gets published in descriptor.
  10219. - Write tor version at the top of each log file
  10220. - New docs in the tarball:
  10221. - tor-doc.html.
  10222. - Document that you should proxy your SSL traffic too.
  10223. - Log a warning if the user uses an unsafe socks variant, so people
  10224. are more likely to learn about privoxy or socat.
  10225. - Log a warning if you're running an unverified server, to let you
  10226. know you might want to get it verified.
  10227. - Change the default exit policy to reject the default edonkey,
  10228. kazaa, gnutella ports.
  10229. - Add replace_file() to util.[ch] to handle win32's rename().
  10230. - Publish OR uptime in descriptor (and thus in directory) too.
  10231. - Remember used bandwidth (both in and out), and publish 15-minute
  10232. snapshots for the past day into our descriptor.
  10233. - Be more aggressive about trying to make circuits when the network
  10234. has changed (e.g. when you unsuspend your laptop).
  10235. - Check for time skew on http headers; report date in response to
  10236. "GET /".
  10237. - If the entrynode config line has only one node, don't pick it as
  10238. an exitnode.
  10239. - Add strict{entry|exit}nodes config options. If set to 1, then
  10240. we refuse to build circuits that don't include the specified entry
  10241. or exit nodes.
  10242. - OutboundBindAddress config option, to bind to a specific
  10243. IP address for outgoing connect()s.
  10244. - End truncated log entries (e.g. directories) with "[truncated]".
  10245. Changes in version 0.0.7.3 - 2004-08-12
  10246. o Stop dnsworkers from triggering an assert failure when you
  10247. ask them to resolve the host "".
  10248. Changes in version 0.0.7.2 - 2004-07-07
  10249. o A better fix for the 0.0.0.0 problem, that will hopefully
  10250. eliminate the remaining related assertion failures.
  10251. Changes in version 0.0.7.1 - 2004-07-04
  10252. o When an address resolves to 0.0.0.0, treat it as a failed resolve,
  10253. since internally we use 0.0.0.0 to signify "not yet resolved".
  10254. Changes in version 0.0.7 - 2004-06-07
  10255. o Fixes for crashes and other obnoxious bugs:
  10256. - Fix an epipe bug: sometimes when directory connections failed
  10257. to connect, we would give them a chance to flush before closing
  10258. them.
  10259. - When we detached from a circuit because of resolvefailed, we
  10260. would immediately try the same circuit twice more, and then
  10261. give up on the resolve thinking we'd tried three different
  10262. exit nodes.
  10263. - Limit the number of intro circuits we'll attempt to build for a
  10264. hidden service per 15-minute period.
  10265. - Check recommended-software string *early*, before actually parsing
  10266. the directory. Thus we can detect an obsolete version and exit,
  10267. even if the new directory format doesn't parse.
  10268. o Fixes for security bugs:
  10269. - Remember which nodes are dirservers when you startup, and if a
  10270. random OR enables his dirport, don't automatically assume he's
  10271. a trusted dirserver.
  10272. o Other bugfixes:
  10273. - Directory connections were asking the wrong poll socket to
  10274. start writing, and not asking themselves to start writing.
  10275. - When we detached from a circuit because we sent a begin but
  10276. didn't get a connected, we would use it again the first time;
  10277. but after that we would correctly switch to a different one.
  10278. - Stop warning when the first onion decrypt attempt fails; they
  10279. will sometimes legitimately fail now that we rotate keys.
  10280. - Override unaligned-access-ok check when $host_cpu is ia64 or
  10281. arm. Apparently they allow it but the kernel whines.
  10282. - Dirservers try to reconnect periodically too, in case connections
  10283. have failed.
  10284. - Fix some memory leaks in directory servers.
  10285. - Allow backslash in Win32 filenames.
  10286. - Made Tor build complain-free on FreeBSD, hopefully without
  10287. breaking other BSD builds. We'll see.
  10288. - Check directory signatures based on name of signer, not on whom
  10289. we got the directory from. This will let us cache directories more
  10290. easily.
  10291. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
  10292. settings too.
  10293. o Features:
  10294. - Doxygen markup on all functions and global variables.
  10295. - Make directory functions update routerlist, not replace it. So
  10296. now directory disagreements are not so critical a problem.
  10297. - Remove the upper limit on number of descriptors in a dirserver's
  10298. directory (not that we were anywhere close).
  10299. - Allow multiple logfiles at different severity ranges.
  10300. - Allow *BindAddress to specify ":port" rather than setting *Port
  10301. separately. Allow multiple instances of each BindAddress config
  10302. option, so you can bind to multiple interfaces if you want.
  10303. - Allow multiple exit policy lines, which are processed in order.
  10304. Now we don't need that huge line with all the commas in it.
  10305. - Enable accept/reject policies on SOCKS connections, so you can bind
  10306. to 0.0.0.0 but still control who can use your OP.
  10307. - Updated the man page to reflect these features.
  10308. Changes in version 0.0.6.2 - 2004-05-16
  10309. o Our integrity-checking digest was checking only the most recent cell,
  10310. not the previous cells like we'd thought.
  10311. Thanks to Stefan Mark for finding the flaw!
  10312. Changes in version 0.0.6.1 - 2004-05-06
  10313. o Fix two bugs in our AES counter-mode implementation (this affected
  10314. onion-level stream encryption, but not TLS-level). It turns
  10315. out we were doing something much more akin to a 16-character
  10316. polyalphabetic cipher. Oops.
  10317. Thanks to Stefan Mark for finding the flaw!
  10318. o Retire moria3 as a directory server, and add tor26 as a directory
  10319. server.
  10320. Changes in version 0.0.6 - 2004-05-02
  10321. o Features:
  10322. - Hidden services and rendezvous points are implemented. Go to
  10323. http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
  10324. hidden services. (This only works via a socks4a proxy such as
  10325. Privoxy, and currently it's quite slow.)
  10326. - We now rotate link (tls context) keys and onion keys.
  10327. - CREATE cells now include oaep padding, so you can tell
  10328. if you decrypted them correctly.
  10329. - Retry stream correctly when we fail to connect because of
  10330. exit-policy-reject (should try another) or can't-resolve-address.
  10331. - When we hup a dirserver and we've *removed* a server from the
  10332. approved-routers list, now we remove that server from the
  10333. in-memory directories too.
  10334. - Add bandwidthburst to server descriptor.
  10335. - Directories now say which dirserver signed them.
  10336. - Use a tor_assert macro that logs failed assertions too.
  10337. - Since we don't support truncateds much, don't bother sending them;
  10338. just close the circ.
  10339. - Fetch randomness from /dev/urandom better (not via fopen/fread)
  10340. - Better debugging for tls errors
  10341. - Set Content-Type on the directory and hidserv descriptor.
  10342. - Remove IVs from cipher code, since AES-ctr has none.
  10343. o Bugfixes:
  10344. - Fix an assert trigger for exit nodes that's been plaguing us since
  10345. the days of 0.0.2prexx (thanks weasel!)
  10346. - Fix a bug where we were closing tls connections intermittently.
  10347. It turns out openssl keeps its errors around -- so if an error
  10348. happens, and you don't ask about it, and then another openssl
  10349. operation happens and succeeds, and you ask if there was an error,
  10350. it tells you about the first error.
  10351. - Fix a bug that's been lurking since 27 may 03 (!)
  10352. When passing back a destroy cell, we would use the wrong circ id.
  10353. - Don't crash if a conn that sent a begin has suddenly lost its circuit.
  10354. - Some versions of openssl have an SSL_pending function that erroneously
  10355. returns bytes when there is a non-application record pending.
  10356. - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
  10357. o We were using an array of length zero in a few places.
  10358. o Win32's gethostbyname can't resolve an IP to an IP.
  10359. o Win32's close can't close a socket.
  10360. o Handle windows socket errors correctly.
  10361. o Portability:
  10362. - check for <sys/limits.h> so we build on FreeBSD again, and
  10363. <machine/limits.h> for NetBSD.
  10364. Changes in version 0.0.5 - 2004-03-30
  10365. o Install torrc as torrc.sample -- we no longer clobber your
  10366. torrc. (Woo!)
  10367. o Fix mangled-state bug in directory fetching (was causing sigpipes).
  10368. o Only build circuits after we've fetched the directory: clients were
  10369. using only the directory servers before they'd fetched a directory.
  10370. This also means longer startup time; so it goes.
  10371. o Fix an assert trigger where an OP would fail to handshake, and we'd
  10372. expect it to have a nickname.
  10373. o Work around a tsocks bug: do a socks reject when AP connection dies
  10374. early, else tsocks goes into an infinite loop.
  10375. o Hold socks connection open until reply is flushed (if possible)
  10376. o Make exit nodes resolve IPs to IPs immediately, rather than asking
  10377. the dns farm to do it.
  10378. o Fix c99 aliasing warnings in rephist.c
  10379. o Don't include server descriptors that are older than 24 hours in the
  10380. directory.
  10381. o Give socks 'reject' replies their whole 15s to attempt to flush,
  10382. rather than seeing the 60s timeout and assuming the flush had failed.
  10383. o Clean automake droppings from the cvs repository
  10384. o Add in a 'notice' log level for things the operator should hear
  10385. but that aren't warnings
  10386. Changes in version 0.0.4 - 2004-03-26
  10387. o When connecting to a dirserver or OR and the network is down,
  10388. we would crash.
  10389. Changes in version 0.0.3 - 2004-03-26
  10390. o Warn and fail if server chose a nickname with illegal characters
  10391. o Port to Solaris and Sparc:
  10392. - include missing header fcntl.h
  10393. - have autoconf find -lsocket -lnsl automatically
  10394. - deal with hardware word alignment
  10395. - make uname() work (solaris has a different return convention)
  10396. - switch from using signal() to sigaction()
  10397. o Preliminary work on reputation system:
  10398. - Keep statistics on success/fail of connect attempts; they're published
  10399. by kill -USR1 currently.
  10400. - Add a RunTesting option to try to learn link state by creating test
  10401. circuits, even when SocksPort is off.
  10402. - Remove unused open circuits when there are too many.
  10403. Changes in version 0.0.2 - 2004-03-19
  10404. - Include strlcpy and strlcat for safer string ops
  10405. - define INADDR_NONE so we compile (but still not run) on solaris
  10406. Changes in version 0.0.2pre27 - 2004-03-14
  10407. o Bugfixes:
  10408. - Allow internal tor networks (we were rejecting internal IPs,
  10409. now we allow them if they're set explicitly).
  10410. - And fix a few endian issues.
  10411. Changes in version 0.0.2pre26 - 2004-03-14
  10412. o New features:
  10413. - If a stream times out after 15s without a connected cell, don't
  10414. try that circuit again: try a new one.
  10415. - Retry streams at most 4 times. Then give up.
  10416. - When a dirserver gets a descriptor from an unknown router, it
  10417. logs its fingerprint (so the dirserver operator can choose to
  10418. accept it even without mail from the server operator).
  10419. - Inform unapproved servers when we reject their descriptors.
  10420. - Make tor build on Windows again. It works as a client, who knows
  10421. about as a server.
  10422. - Clearer instructions in the torrc for how to set up a server.
  10423. - Be more efficient about reading fd's when our global token bucket
  10424. (used for rate limiting) becomes empty.
  10425. o Bugfixes:
  10426. - Stop asserting that computers always go forward in time. It's
  10427. simply not true.
  10428. - When we sent a cell (e.g. destroy) and then marked an OR connection
  10429. expired, we might close it before finishing a flush if the other
  10430. side isn't reading right then.
  10431. - Don't allow dirservers to start if they haven't defined
  10432. RecommendedVersions
  10433. - We were caching transient dns failures. Oops.
  10434. - Prevent servers from publishing an internal IP as their address.
  10435. - Address a strcat vulnerability in circuit.c
  10436. Changes in version 0.0.2pre25 - 2004-03-04
  10437. o New features:
  10438. - Put the OR's IP in its router descriptor, not its fqdn. That way
  10439. we'll stop being stalled by gethostbyname for nodes with flaky dns,
  10440. e.g. poblano.
  10441. o Bugfixes:
  10442. - If the user typed in an address that didn't resolve, the server
  10443. crashed.
  10444. Changes in version 0.0.2pre24 - 2004-03-03
  10445. o Bugfixes:
  10446. - Fix an assertion failure in dns.c, where we were trying to dequeue
  10447. a pending dns resolve even if it wasn't pending
  10448. - Fix a spurious socks5 warning about still trying to write after the
  10449. connection is finished.
  10450. - Hold certain marked_for_close connections open until they're finished
  10451. flushing, rather than losing bytes by closing them too early.
  10452. - Correctly report the reason for ending a stream
  10453. - Remove some duplicate calls to connection_mark_for_close
  10454. - Put switch_id and start_daemon earlier in the boot sequence, so it
  10455. will actually try to chdir() to options.DataDirectory
  10456. - Make 'make test' exit(1) if a test fails; fix some unit tests
  10457. - Make tor fail when you use a config option it doesn't know about,
  10458. rather than warn and continue.
  10459. - Make --version work
  10460. - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
  10461. Changes in version 0.0.2pre23 - 2004-02-29
  10462. o New features:
  10463. - Print a statement when the first circ is finished, so the user
  10464. knows it's working.
  10465. - If a relay cell is unrecognized at the end of the circuit,
  10466. send back a destroy. (So attacks to mutate cells are more
  10467. clearly thwarted.)
  10468. - New config option 'excludenodes' to avoid certain nodes for circuits.
  10469. - When it daemonizes, it chdir's to the DataDirectory rather than "/",
  10470. so you can collect coredumps there.
  10471. o Bugfixes:
  10472. - Fix a bug in tls flushing where sometimes data got wedged and
  10473. didn't flush until more data got sent. Hopefully this bug was
  10474. a big factor in the random delays we were seeing.
  10475. - Make 'connected' cells include the resolved IP, so the client
  10476. dns cache actually gets populated.
  10477. - Disallow changing from ORPort=0 to ORPort>0 on hup.
  10478. - When we time-out on a stream and detach from the circuit, send an
  10479. end cell down it first.
  10480. - Only warn about an unknown router (in exitnodes, entrynodes,
  10481. excludenodes) after we've fetched a directory.
  10482. Changes in version 0.0.2pre22 - 2004-02-26
  10483. o New features:
  10484. - Servers publish less revealing uname information in descriptors.
  10485. - More memory tracking and assertions, to crash more usefully when
  10486. errors happen.
  10487. - If the default torrc isn't there, just use some default defaults.
  10488. Plus provide an internal dirservers file if they don't have one.
  10489. - When the user tries to use Tor as an http proxy, give them an http
  10490. 501 failure explaining that we're a socks proxy.
  10491. - Dump a new router.desc on hup, to help confused people who change
  10492. their exit policies and then wonder why router.desc doesn't reflect
  10493. it.
  10494. - Clean up the generic tor.sh init script that we ship with.
  10495. o Bugfixes:
  10496. - If the exit stream is pending on the resolve, and a destroy arrives,
  10497. then the stream wasn't getting removed from the pending list. I
  10498. think this was the one causing recent server crashes.
  10499. - Use a more robust poll on OSX 10.3, since their poll is flaky.
  10500. - When it couldn't resolve any dirservers, it was useless from then on.
  10501. Now it reloads the RouterFile (or default dirservers) if it has no
  10502. dirservers.
  10503. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
  10504. many users don't even *have* a /usr/local/sbin/.
  10505. Changes in version 0.0.2pre21 - 2004-02-18
  10506. o New features:
  10507. - There's a ChangeLog file that actually reflects the changelog.
  10508. - There's a 'torify' wrapper script, with an accompanying
  10509. tor-tsocks.conf, that simplifies the process of using tsocks for
  10510. tor. It even has a man page.
  10511. - The tor binary gets installed to sbin rather than bin now.
  10512. - Retry streams where the connected cell hasn't arrived in 15 seconds
  10513. - Clean up exit policy handling -- get the default out of the torrc,
  10514. so we can update it without forcing each server operator to fix
  10515. his/her torrc.
  10516. - Allow imaps and pop3s in default exit policy
  10517. o Bugfixes:
  10518. - Prevent picking middleman nodes as the last node in the circuit
  10519. Changes in version 0.0.2pre20 - 2004-01-30
  10520. o New features:
  10521. - We now have a deb package, and it's in debian unstable. Go to
  10522. it, apt-getters. :)
  10523. - I've split the TotalBandwidth option into BandwidthRate (how many
  10524. bytes per second you want to allow, long-term) and
  10525. BandwidthBurst (how many bytes you will allow at once before the cap
  10526. kicks in). This better token bucket approach lets you, say, set
  10527. BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
  10528. performance while not exceeding your monthly bandwidth quota.
  10529. - Push out a tls record's worth of data once you've got it, rather
  10530. than waiting until you've read everything waiting to be read. This
  10531. may improve performance by pipelining better. We'll see.
  10532. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
  10533. from failed circuits (if they haven't been connected yet) and attach
  10534. to new ones.
  10535. - Expire old streams that haven't managed to connect. Some day we'll
  10536. have them reattach to new circuits instead.
  10537. o Bugfixes:
  10538. - Fix several memory leaks that were causing servers to become bloated
  10539. after a while.
  10540. - Fix a few very rare assert triggers. A few more remain.
  10541. - Setuid to User _before_ complaining about running as root.
  10542. Changes in version 0.0.2pre19 - 2004-01-07
  10543. o Bugfixes:
  10544. - Fix deadlock condition in dns farm. We were telling a child to die by
  10545. closing the parent's file descriptor to him. But newer children were
  10546. inheriting the open file descriptor from the parent, and since they
  10547. weren't closing it, the socket never closed, so the child never read
  10548. eof, so he never knew to exit. Similarly, dns workers were holding
  10549. open other sockets, leading to all sorts of chaos.
  10550. - New cleaner daemon() code for forking and backgrounding.
  10551. - If you log to a file, it now prints an entry at the top of the
  10552. logfile so you know it's working.
  10553. - The onionskin challenge length was 30 bytes longer than necessary.
  10554. - Started to patch up the spec so it's not quite so out of date.
  10555. Changes in version 0.0.2pre18 - 2004-01-02
  10556. o Bugfixes:
  10557. - Fix endian issues with the 'integrity' field in the relay header.
  10558. - Fix a potential bug where connections in state
  10559. AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
  10560. Changes in version 0.0.2pre17 - 2003-12-30
  10561. o Bugfixes:
  10562. - Made --debuglogfile (or any second log file, actually) work.
  10563. - Resolved an edge case in get_unique_circ_id_by_conn where a smart
  10564. adversary could force us into an infinite loop.
  10565. o Features:
  10566. - Each onionskin handshake now includes a hash of the computed key,
  10567. to prove the server's identity and help perfect forward secrecy.
  10568. - Changed cell size from 256 to 512 bytes (working toward compatibility
  10569. with MorphMix).
  10570. - Changed cell length to 2 bytes, and moved it to the relay header.
  10571. - Implemented end-to-end integrity checking for the payloads of
  10572. relay cells.
  10573. - Separated streamid from 'recognized' (otherwise circuits will get
  10574. messed up when we try to have streams exit from the middle). We
  10575. use the integrity-checking to confirm that a cell is addressed to
  10576. this hop.
  10577. - Randomize the initial circid and streamid values, so an adversary who
  10578. breaks into a node can't learn how many circuits or streams have
  10579. been made so far.
  10580. Changes in version 0.0.2pre16 - 2003-12-14
  10581. o Bugfixes:
  10582. - Fixed a bug that made HUP trigger an assert
  10583. - Fixed a bug where a circuit that immediately failed wasn't being
  10584. counted as a failed circuit in counting retries.
  10585. o Features:
  10586. - Now we close the circuit when we get a truncated cell: otherwise we're
  10587. open to an anonymity attack where a bad node in the path truncates
  10588. the circuit and then we open streams at him.
  10589. - Add port ranges to exit policies
  10590. - Add a conservative default exit policy
  10591. - Warn if you're running tor as root
  10592. - on HUP, retry OR connections and close/rebind listeners
  10593. - options.EntryNodes: try these nodes first when picking the first node
  10594. - options.ExitNodes: if your best choices happen to include any of
  10595. your preferred exit nodes, you choose among just those preferred
  10596. exit nodes.
  10597. - options.ExcludedNodes: nodes that are never picked in path building
  10598. Changes in version 0.0.2pre15 - 2003-12-03
  10599. o Robustness and bugfixes:
  10600. - Sometimes clients would cache incorrect DNS resolves, which would
  10601. really screw things up.
  10602. - An OP that goes offline would slowly leak all its sockets and stop
  10603. working.
  10604. - A wide variety of bugfixes in exit node selection, exit policy
  10605. handling, and processing pending streams when a new circuit is
  10606. established.
  10607. - Pick nodes for a path only from those the directory says are up
  10608. - Choose randomly from all running dirservers, not always the first one
  10609. - Increase allowed http header size for directory fetch.
  10610. - Stop writing to stderr (if we're daemonized it will be closed).
  10611. - Enable -g always, so cores will be more useful to me.
  10612. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
  10613. o Documentation:
  10614. - Wrote a man page. It lists commonly used options.
  10615. o Configuration:
  10616. - Change default loglevel to warn.
  10617. - Make PidFile default to null rather than littering in your CWD.
  10618. - OnionRouter config option is now obsolete. Instead it just checks
  10619. ORPort>0.
  10620. - Moved to a single unified torrc file for both clients and servers.
  10621. Changes in version 0.0.2pre14 - 2003-11-29
  10622. o Robustness and bugfixes:
  10623. - Force the admin to make the DataDirectory himself
  10624. - to get ownership/permissions right
  10625. - so clients no longer make a DataDirectory and then never use it
  10626. - fix bug where a client who was offline for 45 minutes would never
  10627. pull down a directory again
  10628. - fix (or at least hide really well) the dns assert bug that was
  10629. causing server crashes
  10630. - warnings and improved robustness wrt clockskew for certs
  10631. - use the native daemon(3) to daemonize, when available
  10632. - exit if bind() fails
  10633. - exit if neither socksport nor orport is defined
  10634. - include our own tor_timegm (Win32 doesn't have its own)
  10635. - bugfix for win32 with lots of connections
  10636. - fix minor bias in PRNG
  10637. - make dirserver more robust to corrupt cached directory
  10638. o Documentation:
  10639. - Wrote the design document (woo)
  10640. o Circuit building and exit policies:
  10641. - Circuits no longer try to use nodes that the directory has told them
  10642. are down.
  10643. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
  10644. bitcounts (18.0.0.0/8).
  10645. - Make AP connections standby for a circuit if no suitable circuit
  10646. exists, rather than failing
  10647. - Circuits choose exit node based on addr/port, exit policies, and
  10648. which AP connections are standing by
  10649. - Bump min pathlen from 2 to 3
  10650. - Relay end cells have a payload to describe why the stream ended.
  10651. - If the stream failed because of exit policy, try again with a new
  10652. circuit.
  10653. - Clients have a dns cache to remember resolved addresses.
  10654. - Notice more quickly when we have no working circuits
  10655. o Configuration:
  10656. - APPort is now called SocksPort
  10657. - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
  10658. where to bind
  10659. - RecommendedVersions is now a config variable rather than
  10660. hardcoded (for dirservers)
  10661. - Reloads config on HUP
  10662. - Usage info on -h or --help
  10663. - If you set User and Group config vars, it'll setu/gid to them.
  10664. Changes in version 0.0.2pre13 - 2003-10-19
  10665. o General stability:
  10666. - SSL_write no longer fails when it returns WANTWRITE and the number
  10667. of bytes in the buf has changed by the next SSL_write call.
  10668. - Fix segfault fetching directory when network is down
  10669. - Fix a variety of minor memory leaks
  10670. - Dirservers reload the fingerprints file on HUP, so I don't have
  10671. to take down the network when I approve a new router
  10672. - Default server config file has explicit Address line to specify fqdn
  10673. o Buffers:
  10674. - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
  10675. - Make listener connections not ever alloc bufs
  10676. o Autoconf improvements:
  10677. - don't clobber an external CFLAGS in ./configure
  10678. - Make install now works
  10679. - create var/lib/tor on make install
  10680. - autocreate a tor.sh initscript to help distribs
  10681. - autocreate the torrc and sample-server-torrc with correct paths
  10682. o Log files and Daemonizing now work:
  10683. - If --DebugLogFile is specified, log to it at -l debug
  10684. - If --LogFile is specified, use it instead of commandline
  10685. - If --RunAsDaemon is set, tor forks and backgrounds on startup