ReleaseNotes 367 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 0.2.2.34 - 2011-10-26
  5. Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
  6. can deanonymize Tor users. Everybody should upgrade.
  7. The attack relies on four components: 1) Clients reuse their TLS cert
  8. when talking to different relays, so relays can recognize a user by
  9. the identity key in her cert. 2) An attacker who knows the client's
  10. identity key can probe each guard relay to see if that identity key
  11. is connected to that guard relay right now. 3) A variety of active
  12. attacks in the literature (starting from "Low-Cost Traffic Analysis
  13. of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
  14. discover the guard relays that a Tor user visiting the website is using.
  15. 4) Clients typically pick three guards at random, so the set of guards
  16. for a given user could well be a unique fingerprint for her. This
  17. release fixes components #1 and #2, which is enough to block the attack;
  18. the other two remain as open research problems. Special thanks to
  19. "frosty_un" for reporting the issue to us!
  20. Clients should upgrade so they are no longer recognizable by the TLS
  21. certs they present. Relays should upgrade so they no longer allow a
  22. remote attacker to probe them to test whether unpatched clients are
  23. currently connected to them.
  24. This release also fixes several vulnerabilities that allow an attacker
  25. to enumerate bridge relays. Some bridge enumeration attacks still
  26. remain; see for example proposal 188.
  27. o Privacy/anonymity fixes (clients):
  28. - Clients and bridges no longer send TLS certificate chains on
  29. outgoing OR connections. Previously, each client or bridge would
  30. use the same cert chain for all outgoing OR connections until
  31. its IP address changes, which allowed any relay that the client
  32. or bridge contacted to determine which entry guards it is using.
  33. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  34. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  35. no longer considers that connection as suitable for satisfying a
  36. circuit EXTEND request. Now relays can protect clients from the
  37. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  38. - Directory authorities no longer assign the Guard flag to relays
  39. that haven't upgraded to the above "refuse EXTEND requests
  40. to client connections" fix. Now directory authorities can
  41. protect clients from the CVE-2011-2768 issue even if neither
  42. the clients nor the relays have upgraded yet. There's a new
  43. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  44. to let us transition smoothly, else tomorrow there would be no
  45. guard relays.
  46. o Privacy/anonymity fixes (bridge enumeration):
  47. - Bridge relays now do their directory fetches inside Tor TLS
  48. connections, like all the other clients do, rather than connecting
  49. directly to the DirPort like public relays do. Removes another
  50. avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
  51. - Bridges relays now build circuits for themselves in a more similar
  52. way to how clients build them. Removes another avenue for
  53. enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
  54. when bridges were introduced.
  55. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  56. that they initiated. Relays could distinguish incoming bridge
  57. connections from client connections, creating another avenue for
  58. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  59. Found by "frosty_un".
  60. o Major bugfixes:
  61. - Fix a crash bug when changing node restrictions while a DNS lookup
  62. is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
  63. by "Tey'".
  64. - Don't launch a useless circuit after failing to use one of a
  65. hidden service's introduction points. Previously, we would
  66. launch a new introduction circuit, but not set the hidden service
  67. which that circuit was intended to connect to, so it would never
  68. actually be used. A different piece of code would then create a
  69. new introduction circuit correctly. Bug reported by katmagic and
  70. found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
  71. o Minor bugfixes:
  72. - Change an integer overflow check in the OpenBSD_Malloc code so
  73. that GCC is less likely to eliminate it as impossible. Patch
  74. from Mansour Moufid. Fixes bug 4059.
  75. - When a hidden service turns an extra service-side introduction
  76. circuit into a general-purpose circuit, free the rend_data and
  77. intro_key fields first, so we won't leak memory if the circuit
  78. is cannibalized for use as another service-side introduction
  79. circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
  80. - Bridges now skip DNS self-tests, to act a little more stealthily.
  81. Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
  82. bridges. Patch by "warms0x".
  83. - Fix internal bug-checking logic that was supposed to catch
  84. failures in digest generation so that it will fail more robustly
  85. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  86. Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
  87. - Report any failure in init_keys() calls launched because our
  88. IP address has changed. Spotted by Coverity Scan. Bugfix on
  89. 0.1.1.4-alpha; fixes CID 484.
  90. o Minor bugfixes (log messages and documentation):
  91. - Remove a confusing dollar sign from the example fingerprint in the
  92. man page, and also make the example fingerprint a valid one. Fixes
  93. bug 4309; bugfix on 0.2.1.3-alpha.
  94. - The next version of Windows will be called Windows 8, and it has
  95. a major version of 6, minor version of 2. Correctly identify that
  96. version instead of calling it "Very recent version". Resolves
  97. ticket 4153; reported by funkstar.
  98. - Downgrade log messages about circuit timeout calibration from
  99. "notice" to "info": they don't require or suggest any human
  100. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  101. bugfix on 0.2.2.14-alpha.
  102. o Minor features:
  103. - Turn on directory request statistics by default and include them in
  104. extra-info descriptors. Don't break if we have no GeoIP database.
  105. Backported from 0.2.3.1-alpha; implements ticket 3951.
  106. - Update to the October 4 2011 Maxmind GeoLite Country database.
  107. Changes in version 0.2.1.31 - 2011-10-26
  108. Tor 0.2.1.31 backports important security and privacy fixes for
  109. oldstable. This release is intended only for package maintainers and
  110. others who cannot use the 0.2.2 stable series. All others should be
  111. using Tor 0.2.2.x or newer.
  112. o Security fixes (also included in 0.2.2.x):
  113. - Replace all potentially sensitive memory comparison operations
  114. with versions whose runtime does not depend on the data being
  115. compared. This will help resist a class of attacks where an
  116. adversary can use variations in timing information to learn
  117. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  118. implementation by Robert Ransom based partially on code by DJB.)
  119. - Fix an assert in parsing router descriptors containing IPv6
  120. addresses. This one took down the directory authorities when
  121. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  122. o Privacy/anonymity fixes (also included in 0.2.2.x):
  123. - Clients and bridges no longer send TLS certificate chains on
  124. outgoing OR connections. Previously, each client or bridge would
  125. use the same cert chain for all outgoing OR connections until
  126. its IP address changes, which allowed any relay that the client
  127. or bridge contacted to determine which entry guards it is using.
  128. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  129. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  130. no longer considers that connection as suitable for satisfying a
  131. circuit EXTEND request. Now relays can protect clients from the
  132. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  133. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  134. that they initiated. Relays could distinguish incoming bridge
  135. connections from client connections, creating another avenue for
  136. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  137. Found by "frosty_un".
  138. - When receiving a hidden service descriptor, check that it is for
  139. the hidden service we wanted. Previously, Tor would store any
  140. hidden service descriptors that a directory gave it, whether it
  141. wanted them or not. This wouldn't have let an attacker impersonate
  142. a hidden service, but it did let directories pre-seed a client
  143. with descriptors that it didn't want. Bugfix on 0.0.6.
  144. - Avoid linkability based on cached hidden service descriptors: forget
  145. all hidden service descriptors cached as a client when processing a
  146. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  147. - Make the bridge directory authority refuse to answer directory
  148. requests for "all" descriptors. It used to include bridge
  149. descriptors in its answer, which was a major information leak.
  150. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  151. - Don't attach new streams to old rendezvous circuits after SIGNAL
  152. NEWNYM. Previously, we would keep using an existing rendezvous
  153. circuit if it remained open (i.e. if it were kept open by a
  154. long-lived stream, or if a new stream were attached to it before
  155. Tor could notice that it was old and no longer in use). Bugfix on
  156. 0.1.1.15-rc; fixes bug 3375.
  157. o Minor bugfixes (also included in 0.2.2.x):
  158. - When we restart our relay, we might get a successful connection
  159. from the outside before we've started our reachability tests,
  160. triggering a warning: "ORPort found reachable, but I have no
  161. routerinfo yet. Failing to inform controller of success." This
  162. bug was harmless unless Tor is running under a controller
  163. like Vidalia, in which case the controller would never get a
  164. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  165. fixes bug 1172.
  166. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  167. enabled. Fixes bug 1526.
  168. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  169. anything since 0.2.1.16-rc.
  170. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  171. None of the cases where we did this before were wrong, but by making
  172. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  173. - Fix a rare crash bug that could occur when a client was configured
  174. with a large number of bridges. Fixes bug 2629; bugfix on
  175. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  176. - Correct the warning displayed when a rendezvous descriptor exceeds
  177. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  178. John Brooks.
  179. - Fix an uncommon assertion failure when running with DNSPort under
  180. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  181. - When warning about missing zlib development packages during compile,
  182. give the correct package names. Bugfix on 0.2.0.1-alpha.
  183. - Require that introduction point keys and onion keys have public
  184. exponent 65537. Bugfix on 0.2.0.10-alpha.
  185. - Do not crash when our configuration file becomes unreadable, for
  186. example due to a permissions change, between when we start up
  187. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  188. on 0.0.9pre6.
  189. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  190. Fixes bug 3208.
  191. - Always NUL-terminate the sun_path field of a sockaddr_un before
  192. passing it to the kernel. (Not a security issue: kernels are
  193. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  194. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  195. - Don't stack-allocate the list of supplementary GIDs when we're
  196. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  197. could take up to 256K, which is way too much stack. Found by
  198. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  199. o Minor bugfixes (only in 0.2.1.x):
  200. - Resume using micro-version numbers in 0.2.1.x: our Debian packages
  201. rely on them. Bugfix on 0.2.1.30.
  202. - Use git revisions instead of svn revisions when generating our
  203. micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  204. o Minor features (also included in 0.2.2.x):
  205. - Adjust the expiration time on our SSL session certificates to
  206. better match SSL certs seen in the wild. Resolves ticket 4014.
  207. - Allow nameservers with IPv6 address. Resolves bug 2574.
  208. - Update to the October 4 2011 Maxmind GeoLite Country database.
  209. Changes in version 0.2.2.33 - 2011-09-13
  210. Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
  211. TLS handshake that makes relays and bridges that run this new version
  212. reachable from Iran again.
  213. o Major bugfixes:
  214. - Avoid an assertion failure when reloading a configuration with
  215. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  216. 3923; bugfix on 0.2.2.25-alpha.
  217. o Minor features (security):
  218. - Check for replays of the public-key encrypted portion of an
  219. INTRODUCE1 cell, in addition to the current check for replays of
  220. the g^x value. This prevents a possible class of active attacks
  221. by an attacker who controls both an introduction point and a
  222. rendezvous point, and who uses the malleability of AES-CTR to
  223. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  224. that these attacks are infeasible (requiring the attacker to send
  225. on the order of zettabytes of altered cells in a short interval),
  226. but we'd rather block them off in case there are any classes of
  227. this attack that we missed. Reported by Willem Pinckaers.
  228. o Minor features:
  229. - Adjust the expiration time on our SSL session certificates to
  230. better match SSL certs seen in the wild. Resolves ticket 4014.
  231. - Change the default required uptime for a relay to be accepted as
  232. a HSDir (hidden service directory) from 24 hours to 25 hours.
  233. Improves on 0.2.0.10-alpha; resolves ticket 2649.
  234. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  235. authorities to abstain from voting on assignment of the HSDir
  236. consensus flag. Related to bug 2649.
  237. - Update to the September 6 2011 Maxmind GeoLite Country database.
  238. o Minor bugfixes (documentation and log messages):
  239. - Correct the man page to explain that HashedControlPassword and
  240. CookieAuthentication can both be set, in which case either method
  241. is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
  242. when we decided to allow these config options to both be set. Issue
  243. raised by bug 3898.
  244. - Demote the 'replay detected' log message emitted when a hidden
  245. service receives the same Diffie-Hellman public key in two different
  246. INTRODUCE2 cells to info level. A normal Tor client can cause that
  247. log message during its normal operation. Bugfix on 0.2.1.6-alpha;
  248. fixes part of bug 2442.
  249. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  250. level. There is nothing that a hidden service's operator can do
  251. to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
  252. of bug 2442.
  253. - Clarify a log message specifying the characters permitted in
  254. HiddenServiceAuthorizeClient client names. Previously, the log
  255. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  256. given the impression that every ASCII character between "+" and "_"
  257. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
  258. o Build fixes:
  259. - Provide a substitute implementation of lround() for MSVC, which
  260. apparently lacks it. Patch from Gisle Vanem.
  261. - Clean up some code issues that prevented Tor from building on older
  262. BSDs. Fixes bug 3894; reported by "grarpamp".
  263. - Search for a platform-specific version of "ar" when cross-compiling.
  264. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  265. Changes in version 0.2.2.32 - 2011-08-27
  266. The Tor 0.2.2 release series is dedicated to the memory of Andreas
  267. Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
  268. a founder of the PETS community, a leader in our field, a mentor,
  269. and a friend. He left us with these words: "I had the possibility
  270. to contribute to this world that is not as it should be. I hope I
  271. could help in some areas to make the world a better place, and that
  272. I could also encourage other people to be engaged in improving the
  273. world. Please, stay engaged. This world needs you, your love, your
  274. initiative -- now I cannot be part of that anymore."
  275. Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
  276. ready. More than two years in the making, this release features improved
  277. client performance and hidden service reliability, better compatibility
  278. for Android, correct behavior for bridges that listen on more than
  279. one address, more extensible and flexible directory object handling,
  280. better reporting of network statistics, improved code security, and
  281. many many other features and bugfixes.
  282. o Major features (client performance):
  283. - When choosing which cells to relay first, relays now favor circuits
  284. that have been quiet recently, to provide lower latency for
  285. low-volume circuits. By default, relays enable or disable this
  286. feature based on a setting in the consensus. They can override
  287. this default by using the new "CircuitPriorityHalflife" config
  288. option. Design and code by Ian Goldberg, Can Tang, and Chris
  289. Alexander.
  290. - Directory authorities now compute consensus weightings that instruct
  291. clients how to weight relays flagged as Guard, Exit, Guard+Exit,
  292. and no flag. Clients use these weightings to distribute network load
  293. more evenly across these different relay types. The weightings are
  294. in the consensus so we can change them globally in the future. Extra
  295. thanks to "outofwords" for finding some nasty security bugs in
  296. the first implementation of this feature.
  297. o Major features (client performance, circuit build timeout):
  298. - Tor now tracks how long it takes to build client-side circuits
  299. over time, and adapts its timeout to local network performance.
  300. Since a circuit that takes a long time to build will also provide
  301. bad performance, we get significant latency improvements by
  302. discarding the slowest 20% of circuits. Specifically, Tor creates
  303. circuits more aggressively than usual until it has enough data
  304. points for a good timeout estimate. Implements proposal 151.
  305. - Circuit build timeout constants can be controlled by consensus
  306. parameters. We set good defaults for these parameters based on
  307. experimentation on broadband and simulated high-latency links.
  308. - Circuit build time learning can be disabled via consensus parameter
  309. or by the client via a LearnCircuitBuildTimeout config option. We
  310. also automatically disable circuit build time calculation if either
  311. AuthoritativeDirectory is set, or if we fail to write our state
  312. file. Implements ticket 1296.
  313. o Major features (relays use their capacity better):
  314. - Set SO_REUSEADDR socket option on all sockets, not just
  315. listeners. This should help busy exit nodes avoid running out of
  316. useable ports just because all the ports have been used in the
  317. near past. Resolves issue 2850.
  318. - Relays now save observed peak bandwidth throughput rates to their
  319. state file (along with total usage, which was already saved),
  320. so that they can determine their correct estimated bandwidth on
  321. restart. Resolves bug 1863, where Tor relays would reset their
  322. estimated bandwidth to 0 after restarting.
  323. - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
  324. should give us approximately 40-50% more Guard-flagged nodes,
  325. improving the anonymity the Tor network can provide and also
  326. decreasing the dropoff in throughput that relays experience when
  327. they first get the Guard flag.
  328. - Directory authorities now take changes in router IP address and
  329. ORPort into account when determining router stability. Previously,
  330. if a router changed its IP or ORPort, the authorities would not
  331. treat it as having any downtime for the purposes of stability
  332. calculation, whereas clients would experience downtime since the
  333. change would take a while to propagate to them. Resolves issue 1035.
  334. - New AccelName and AccelDir options add support for dynamic OpenSSL
  335. hardware crypto acceleration engines.
  336. o Major features (relays control their load better):
  337. - Exit relays now try harder to block exit attempts from unknown
  338. relays, to make it harder for people to use them as one-hop proxies
  339. a la tortunnel. Controlled by the refuseunknownexits consensus
  340. parameter (currently enabled), or you can override it on your
  341. relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
  342. based on a variant of proposal 163.
  343. - Add separate per-conn write limiting to go with the per-conn read
  344. limiting. We added a global write limit in Tor 0.1.2.5-alpha,
  345. but never per-conn write limits.
  346. - New consensus params "bwconnrate" and "bwconnburst" to let us
  347. rate-limit client connections as they enter the network. It's
  348. controlled in the consensus so we can turn it on and off for
  349. experiments. It's starting out off. Based on proposal 163.
  350. o Major features (controllers):
  351. - Export GeoIP information on bridge usage to controllers even if we
  352. have not yet been running for 24 hours. Now Vidalia bridge operators
  353. can get more accurate and immediate feedback about their
  354. contributions to the network.
  355. - Add an __OwningControllerProcess configuration option and a
  356. TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
  357. that when it exits, Tor will shut down. Implements feature 3049.
  358. o Major features (directory authorities):
  359. - Directory authorities now create, vote on, and serve multiple
  360. parallel formats of directory data as part of their voting process.
  361. Partially implements Proposal 162: "Publish the consensus in
  362. multiple flavors".
  363. - Directory authorities now agree on and publish small summaries
  364. of router information that clients can use in place of regular
  365. server descriptors. This transition will allow Tor 0.2.3 clients
  366. to use far less bandwidth for downloading information about the
  367. network. Begins the implementation of Proposal 158: "Clients
  368. download consensus + microdescriptors".
  369. - The directory voting system is now extensible to use multiple hash
  370. algorithms for signatures and resource selection. Newer formats
  371. are signed with SHA256, with a possibility for moving to a better
  372. hash algorithm in the future.
  373. - Directory authorities can now vote on arbitary integer values as
  374. part of the consensus process. This is designed to help set
  375. network-wide parameters. Implements proposal 167.
  376. o Major features and bugfixes (node selection):
  377. - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
  378. ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
  379. options. Previously, we had been ambiguous in describing what
  380. counted as an "exit" node, and what operations exactly "StrictNodes
  381. 0" would permit. This created confusion when people saw nodes built
  382. through unexpected circuits, and made it hard to tell real bugs from
  383. surprises. Now the intended behavior is:
  384. . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
  385. a node that delivers user traffic outside the Tor network.
  386. . "Entry", in the context of EntryNodes, means a node used as the
  387. first hop of a multihop circuit. It doesn't include direct
  388. connections to directory servers.
  389. . "ExcludeNodes" applies to all nodes.
  390. . "StrictNodes" changes the behavior of ExcludeNodes only. When
  391. StrictNodes is set, Tor should avoid all nodes listed in
  392. ExcludeNodes, even when it will make user requests fail. When
  393. StrictNodes is *not* set, then Tor should follow ExcludeNodes
  394. whenever it can, except when it must use an excluded node to
  395. perform self-tests, connect to a hidden service, provide a
  396. hidden service, fulfill a .exit request, upload directory
  397. information, or fetch directory information.
  398. Collectively, the changes to implement the behavior fix bug 1090.
  399. - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
  400. change during a config reload, mark and discard all our origin
  401. circuits. This fix should address edge cases where we change the
  402. config options and but then choose a circuit that we created before
  403. the change.
  404. - Make EntryNodes config option much more aggressive even when
  405. StrictNodes is not set. Before it would prepend your requested
  406. entrynodes to your list of guard nodes, but feel free to use others
  407. after that. Now it chooses only from your EntryNodes if any of
  408. those are available, and only falls back to others if a) they're
  409. all down and b) StrictNodes is not set.
  410. - Now we refresh your entry guards from EntryNodes at each consensus
  411. fetch -- rather than just at startup and then they slowly rot as
  412. the network changes.
  413. - Add support for the country code "{??}" in torrc options like
  414. ExcludeNodes, to indicate all routers of unknown country. Closes
  415. bug 1094.
  416. - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
  417. a node is listed in both, it's treated as excluded.
  418. - ExcludeNodes now applies to directory nodes -- as a preference if
  419. StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
  420. Don't exclude all the directory authorities and set StrictNodes to 1
  421. unless you really want your Tor to break.
  422. - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
  423. - ExcludeExitNodes now overrides .exit requests.
  424. - We don't use bridges listed in ExcludeNodes.
  425. - When StrictNodes is 1:
  426. . We now apply ExcludeNodes to hidden service introduction points
  427. and to rendezvous points selected by hidden service users. This
  428. can make your hidden service less reliable: use it with caution!
  429. . If we have used ExcludeNodes on ourself, do not try relay
  430. reachability self-tests.
  431. . If we have excluded all the directory authorities, we will not
  432. even try to upload our descriptor if we're a relay.
  433. . Do not honor .exit requests to an excluded node.
  434. - When the set of permitted nodes changes, we now remove any mappings
  435. introduced via TrackExitHosts to now-excluded nodes. Bugfix on
  436. 0.1.0.1-rc.
  437. - We never cannibalize a circuit that had excluded nodes on it, even
  438. if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
  439. - Improve log messages related to excluded nodes.
  440. o Major features (misc):
  441. - Numerous changes, bugfixes, and workarounds from Nathan Freitas
  442. to help Tor build correctly for Android phones.
  443. - The options SocksPort, ControlPort, and so on now all accept a
  444. value "auto" that opens a socket on an OS-selected port. A
  445. new ControlPortWriteToFile option tells Tor to write its
  446. actual control port or ports to a chosen file. If the option
  447. ControlPortFileGroupReadable is set, the file is created as
  448. group-readable. Now users can run two Tor clients on the same
  449. system without needing to manually mess with parameters. Resolves
  450. part of ticket 3076.
  451. - Tor now supports tunneling all of its outgoing connections over
  452. a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
  453. configuration options. Code by Christopher Davis.
  454. o Code security improvements:
  455. - Replace all potentially sensitive memory comparison operations
  456. with versions whose runtime does not depend on the data being
  457. compared. This will help resist a class of attacks where an
  458. adversary can use variations in timing information to learn
  459. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  460. implementation by Robert Ransom based partially on code by DJB.)
  461. - Enable Address Space Layout Randomization (ASLR) and Data Execution
  462. Prevention (DEP) by default on Windows to make it harder for
  463. attackers to exploit vulnerabilities. Patch from John Brooks.
  464. - New "--enable-gcc-hardening" ./configure flag (off by default)
  465. to turn on gcc compile time hardening options. It ensures
  466. that signed ints have defined behavior (-fwrapv), enables
  467. -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
  468. with canaries (-fstack-protector-all), turns on ASLR protection if
  469. supported by the kernel (-fPIE, -pie), and adds additional security
  470. related warnings. Verified to work on Mac OS X and Debian Lenny.
  471. - New "--enable-linker-hardening" ./configure flag (off by default)
  472. to turn on ELF specific hardening features (relro, now). This does
  473. not work with Mac OS X or any other non-ELF binary format.
  474. - Always search the Windows system directory for system DLLs, and
  475. nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
  476. - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
  477. current and future memory pages via mlockall(). On supported
  478. platforms (modern Linux and probably BSD but not Windows or OS X),
  479. this should effectively disable any and all attempts to page out
  480. memory. This option requires that you start your Tor as root --
  481. if you use DisableAllSwap, please consider using the User option
  482. to properly reduce the privileges of your Tor.
  483. o Major bugfixes (crashes):
  484. - Fix crash bug on platforms where gmtime and localtime can return
  485. NULL. Windows 7 users were running into this one. Fixes part of bug
  486. 2077. Bugfix on all versions of Tor. Found by boboper.
  487. - Introduce minimum/maximum values that clients will believe
  488. from the consensus. Now we'll have a better chance to avoid crashes
  489. or worse when a consensus param has a weird value.
  490. - Fix a rare crash bug that could occur when a client was configured
  491. with a large number of bridges. Fixes bug 2629; bugfix on
  492. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  493. - Do not crash when our configuration file becomes unreadable, for
  494. example due to a permissions change, between when we start up
  495. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  496. on 0.0.9pre6.
  497. - If we're in the pathological case where there's no exit bandwidth
  498. but there is non-exit bandwidth, or no guard bandwidth but there
  499. is non-guard bandwidth, don't crash during path selection. Bugfix
  500. on 0.2.0.3-alpha.
  501. - Fix a crash bug when trying to initialize the evdns module in
  502. Libevent 2. Bugfix on 0.2.1.16-rc.
  503. o Major bugfixes (stability):
  504. - Fix an assert in parsing router descriptors containing IPv6
  505. addresses. This one took down the directory authorities when
  506. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  507. - Fix an uncommon assertion failure when running with DNSPort under
  508. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  509. - Treat an unset $HOME like an empty $HOME rather than triggering an
  510. assert. Bugfix on 0.0.8pre1; fixes bug 1522.
  511. - More gracefully handle corrupt state files, removing asserts
  512. in favor of saving a backup and resetting state.
  513. - Instead of giving an assertion failure on an internal mismatch
  514. on estimated freelist size, just log a BUG warning and try later.
  515. Mitigates but does not fix bug 1125.
  516. - Fix an assert that got triggered when using the TestingTorNetwork
  517. configuration option and then issuing a GETINFO config-text control
  518. command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
  519. - If the cached cert file is unparseable, warn but don't exit.
  520. o Privacy fixes (relays/bridges):
  521. - Don't list Windows capabilities in relay descriptors. We never made
  522. use of them, and maybe it's a bad idea to publish them. Bugfix
  523. on 0.1.1.8-alpha.
  524. - If the Nickname configuration option isn't given, Tor would pick a
  525. nickname based on the local hostname as the nickname for a relay.
  526. Because nicknames are not very important in today's Tor and the
  527. "Unnamed" nickname has been implemented, this is now problematic
  528. behavior: It leaks information about the hostname without being
  529. useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
  530. introduced the Unnamed nickname. Reported by tagnaq.
  531. - Maintain separate TLS contexts and certificates for incoming and
  532. outgoing connections in bridge relays. Previously we would use the
  533. same TLS contexts and certs for incoming and outgoing connections.
  534. Bugfix on 0.2.0.3-alpha; addresses bug 988.
  535. - Maintain separate identity keys for incoming and outgoing TLS
  536. contexts in bridge relays. Previously we would use the same
  537. identity keys for incoming and outgoing TLS contexts. Bugfix on
  538. 0.2.0.3-alpha; addresses the other half of bug 988.
  539. - Make the bridge directory authority refuse to answer directory
  540. requests for "all descriptors". It used to include bridge
  541. descriptors in its answer, which was a major information leak.
  542. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  543. o Privacy fixes (clients):
  544. - When receiving a hidden service descriptor, check that it is for
  545. the hidden service we wanted. Previously, Tor would store any
  546. hidden service descriptors that a directory gave it, whether it
  547. wanted them or not. This wouldn't have let an attacker impersonate
  548. a hidden service, but it did let directories pre-seed a client
  549. with descriptors that it didn't want. Bugfix on 0.0.6.
  550. - Start the process of disabling ".exit" address notation, since it
  551. can be used for a variety of esoteric application-level attacks
  552. on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
  553. on 0.0.9rc5.
  554. - Reject attempts at the client side to open connections to private
  555. IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
  556. a randomly chosen exit node. Attempts to do so are always
  557. ill-defined, generally prevented by exit policies, and usually
  558. in error. This will also help to detect loops in transparent
  559. proxy configurations. You can disable this feature by setting
  560. "ClientRejectInternalAddresses 0" in your torrc.
  561. - Log a notice when we get a new control connection. Now it's easier
  562. for security-conscious users to recognize when a local application
  563. is knocking on their controller door. Suggested by bug 1196.
  564. o Privacy fixes (newnym):
  565. - Avoid linkability based on cached hidden service descriptors: forget
  566. all hidden service descriptors cached as a client when processing a
  567. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  568. - On SIGHUP, do not clear out all TrackHostExits mappings, client
  569. DNS cache entries, and virtual address mappings: that's what
  570. NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
  571. - Don't attach new streams to old rendezvous circuits after SIGNAL
  572. NEWNYM. Previously, we would keep using an existing rendezvous
  573. circuit if it remained open (i.e. if it were kept open by a
  574. long-lived stream, or if a new stream were attached to it before
  575. Tor could notice that it was old and no longer in use). Bugfix on
  576. 0.1.1.15-rc; fixes bug 3375.
  577. o Major bugfixes (relay bandwidth accounting):
  578. - Fix a bug that could break accounting on 64-bit systems with large
  579. time_t values, making them hibernate for impossibly long intervals.
  580. Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
  581. - Fix a bug in bandwidth accounting that could make us use twice
  582. the intended bandwidth when our interval start changes due to
  583. daylight saving time. Now we tolerate skew in stored vs computed
  584. interval starts: if the start of the period changes by no more than
  585. 50% of the period's duration, we remember bytes that we transferred
  586. in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
  587. o Major bugfixes (bridges):
  588. - Bridges now use "reject *:*" as their default exit policy. Bugfix
  589. on 0.2.0.3-alpha. Fixes bug 1113.
  590. - If you configure your bridge with a known identity fingerprint,
  591. and the bridge authority is unreachable (as it is in at least
  592. one country now), fall back to directly requesting the descriptor
  593. from the bridge. Finishes the feature started in 0.2.0.10-alpha;
  594. closes bug 1138.
  595. - Fix a bug where bridge users who configure the non-canonical
  596. address of a bridge automatically switch to its canonical
  597. address. If a bridge listens at more than one address, it
  598. should be able to advertise those addresses independently and
  599. any non-blocked addresses should continue to work. Bugfix on Tor
  600. 0.2.0.3-alpha. Fixes bug 2510.
  601. - If you configure Tor to use bridge A, and then quit and
  602. configure Tor to use bridge B instead (or if you change Tor
  603. to use bridge B via the controller), it would happily continue
  604. to use bridge A if it's still reachable. While this behavior is
  605. a feature if your goal is connectivity, in some scenarios it's a
  606. dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
  607. - When the controller configures a new bridge, don't wait 10 to 60
  608. seconds before trying to fetch its descriptor. Bugfix on
  609. 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
  610. o Major bugfixes (directory authorities):
  611. - Many relays have been falling out of the consensus lately because
  612. not enough authorities know about their descriptor for them to get
  613. a majority of votes. When we deprecated the v2 directory protocol,
  614. we got rid of the only way that v3 authorities can hear from each
  615. other about other descriptors. Now authorities examine every v3
  616. vote for new descriptors, and fetch them from that authority. Bugfix
  617. on 0.2.1.23.
  618. - Authorities could be tricked into giving out the Exit flag to relays
  619. that didn't allow exiting to any ports. This bug could screw
  620. with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
  621. 1238. Bug discovered by Martin Kowalczyk.
  622. - If all authorities restart at once right before a consensus vote,
  623. nobody will vote about "Running", and clients will get a consensus
  624. with no usable relays. Instead, authorities refuse to build a
  625. consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
  626. o Major bugfixes (stream-level fairness):
  627. - When receiving a circuit-level SENDME for a blocked circuit, try
  628. to package cells fairly from all the streams that had previously
  629. been blocked on that circuit. Previously, we had started with the
  630. oldest stream, and allowed each stream to potentially exhaust
  631. the circuit's package window. This gave older streams on any
  632. given circuit priority over newer ones. Fixes bug 1937. Detected
  633. originally by Camilo Viecco. This bug was introduced before the
  634. first Tor release, in svn commit r152: it is the new winner of
  635. the longest-lived bug prize.
  636. - Fix a stream fairness bug that would cause newer streams on a given
  637. circuit to get preference when reading bytes from the origin or
  638. destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
  639. introduced before the first Tor release, in svn revision r152.
  640. - When the exit relay got a circuit-level sendme cell, it started
  641. reading on the exit streams, even if had 500 cells queued in the
  642. circuit queue already, so the circuit queue just grew and grew in
  643. some cases. We fix this by not re-enabling reading on receipt of a
  644. sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
  645. on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
  646. "yetonetime".
  647. - Newly created streams were allowed to read cells onto circuits,
  648. even if the circuit's cell queue was blocked and waiting to drain.
  649. This created potential unfairness, as older streams would be
  650. blocked, but newer streams would gladly fill the queue completely.
  651. We add code to detect this situation and prevent any stream from
  652. getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
  653. fixes bug 1298.
  654. o Major bugfixes (hidden services):
  655. - Apply circuit timeouts to opened hidden-service-related circuits
  656. based on the correct start time. Previously, we would apply the
  657. circuit build timeout based on time since the circuit's creation;
  658. it was supposed to be applied based on time since the circuit
  659. entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
  660. - Improve hidden service robustness: When we find that we have
  661. extended a hidden service's introduction circuit to a relay not
  662. listed as an introduction point in the HS descriptor we currently
  663. have, retry with an introduction point from the current
  664. descriptor. Previously we would just give up. Fixes bugs 1024 and
  665. 1930; bugfix on 0.2.0.10-alpha.
  666. - Directory authorities now use data collected from their own
  667. uptime observations when choosing whether to assign the HSDir flag
  668. to relays, instead of trusting the uptime value the relay reports in
  669. its descriptor. This change helps prevent an attack where a small
  670. set of nodes with frequently-changing identity keys can blackhole
  671. a hidden service. (Only authorities need upgrade; others will be
  672. fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
  673. - Stop assigning the HSDir flag to relays that disable their
  674. DirPort (and thus will refuse to answer directory requests). This
  675. fix should dramatically improve the reachability of hidden services:
  676. hidden services and hidden service clients pick six HSDir relays
  677. to store and retrieve the hidden service descriptor, and currently
  678. about half of the HSDir relays will refuse to work. Bugfix on
  679. 0.2.0.10-alpha; fixes part of bug 1693.
  680. o Major bugfixes (misc):
  681. - Clients now stop trying to use an exit node associated with a given
  682. destination by TrackHostExits if they fail to reach that exit node.
  683. Fixes bug 2999. Bugfix on 0.2.0.20-rc.
  684. - Fix a regression that caused Tor to rebind its ports if it receives
  685. SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
  686. - Remove an extra pair of quotation marks around the error
  687. message in control-port STATUS_GENERAL BUG events. Bugfix on
  688. 0.1.2.6-alpha; fixes bug 3732.
  689. o Minor features (relays):
  690. - Ensure that no empty [dirreq-](read|write)-history lines are added
  691. to an extrainfo document. Implements ticket 2497.
  692. - When bandwidth accounting is enabled, be more generous with how
  693. much bandwidth we'll use up before entering "soft hibernation".
  694. Previously, we'd refuse new connections and circuits once we'd
  695. used up 95% of our allotment. Now, we use up 95% of our allotment,
  696. AND make sure that we have no more than 500MB (or 3 hours of
  697. expected traffic, whichever is lower) remaining before we enter
  698. soft hibernation.
  699. - Relays now log the reason for publishing a new relay descriptor,
  700. so we have a better chance of hunting down instances of bug 1810.
  701. Resolves ticket 3252.
  702. - Log a little more clearly about the times at which we're no longer
  703. accepting new connections (e.g. due to hibernating). Resolves
  704. bug 2181.
  705. - When AllowSingleHopExits is set, print a warning to explain to the
  706. relay operator why most clients are avoiding her relay.
  707. - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
  708. Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
  709. clients are already deprecated because of security bugs.
  710. o Minor features (network statistics):
  711. - Directory mirrors that set "DirReqStatistics 1" write statistics
  712. about directory requests to disk every 24 hours. As compared to the
  713. "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
  714. improvements: 1) stats are written to disk exactly every 24 hours;
  715. 2) estimated shares of v2 and v3 requests are determined as mean
  716. values, not at the end of a measurement period; 3) unresolved
  717. requests are listed with country code '??'; 4) directories also
  718. measure download times.
  719. - Exit nodes that set "ExitPortStatistics 1" write statistics on the
  720. number of exit streams and transferred bytes per port to disk every
  721. 24 hours.
  722. - Relays that set "CellStatistics 1" write statistics on how long
  723. cells spend in their circuit queues to disk every 24 hours.
  724. - Entry nodes that set "EntryStatistics 1" write statistics on the
  725. rough number and origins of connecting clients to disk every 24
  726. hours.
  727. - Relays that write any of the above statistics to disk and set
  728. "ExtraInfoStatistics 1" include the past 24 hours of statistics in
  729. their extra-info documents. Implements proposal 166.
  730. o Minor features (GeoIP and statistics):
  731. - Provide a log message stating which geoip file we're parsing
  732. instead of just stating that we're parsing the geoip file.
  733. Implements ticket 2432.
  734. - Make sure every relay writes a state file at least every 12 hours.
  735. Previously, a relay could go for weeks without writing its state
  736. file, and on a crash could lose its bandwidth history, capacity
  737. estimates, client country statistics, and so on. Addresses bug 3012.
  738. - Relays report the number of bytes spent on answering directory
  739. requests in extra-info descriptors similar to {read,write}-history.
  740. Implements enhancement 1790.
  741. - Report only the top 10 ports in exit-port stats in order not to
  742. exceed the maximum extra-info descriptor length of 50 KB. Implements
  743. task 2196.
  744. - If writing the state file to disk fails, wait up to an hour before
  745. retrying again, rather than trying again each second. Fixes bug
  746. 2346; bugfix on Tor 0.1.1.3-alpha.
  747. - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
  748. when we switch from being a public relay to a bridge. Otherwise
  749. there will still be clients that see the relay in their consensus,
  750. and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
  751. bug 932.
  752. - Update to the August 2 2011 Maxmind GeoLite Country database.
  753. o Minor features (clients):
  754. - When expiring circuits, use microsecond timers rather than
  755. one-second timers. This can avoid an unpleasant situation where a
  756. circuit is launched near the end of one second and expired right
  757. near the beginning of the next, and prevent fluctuations in circuit
  758. timeout values.
  759. - If we've configured EntryNodes and our network goes away and/or all
  760. our entrynodes get marked down, optimistically retry them all when
  761. a new socks application request appears. Fixes bug 1882.
  762. - Always perform router selections using weighted relay bandwidth,
  763. even if we don't need a high capacity circuit at the time. Non-fast
  764. circuits now only differ from fast ones in that they can use relays
  765. not marked with the Fast flag. This "feature" could turn out to
  766. be a horrible bug; we should investigate more before it goes into
  767. a stable release.
  768. - When we run out of directory information such that we can't build
  769. circuits, but then get enough that we can build circuits, log when
  770. we actually construct a circuit, so the user has a better chance of
  771. knowing what's going on. Fixes bug 1362.
  772. - Log SSL state transitions at debug level during handshake, and
  773. include SSL states in error messages. This may help debug future
  774. SSL handshake issues.
  775. o Minor features (directory authorities):
  776. - When a router changes IP address or port, authorities now launch
  777. a new reachability test for it. Implements ticket 1899.
  778. - Directory authorities now reject relays running any versions of
  779. Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
  780. known bugs that keep RELAY_EARLY cells from working on rendezvous
  781. circuits. Followup to fix for bug 2081.
  782. - Directory authorities now reject relays running any version of Tor
  783. older than 0.2.0.26-rc. That version is the earliest that fetches
  784. current directory information correctly. Fixes bug 2156.
  785. - Directory authorities now do an immediate reachability check as soon
  786. as they hear about a new relay. This change should slightly reduce
  787. the time between setting up a relay and getting listed as running
  788. in the consensus. It should also improve the time between setting
  789. up a bridge and seeing use by bridge users.
  790. - Directory authorities no longer launch a TLS connection to every
  791. relay as they startup. Now that we have 2k+ descriptors cached,
  792. the resulting network hiccup is becoming a burden. Besides,
  793. authorities already avoid voting about Running for the first half
  794. hour of their uptime.
  795. - Directory authorities now log the source of a rejected POSTed v3
  796. networkstatus vote, so we can track failures better.
  797. - Backport code from 0.2.3.x that allows directory authorities to
  798. clean their microdescriptor caches. Needed to resolve bug 2230.
  799. o Minor features (hidden services):
  800. - Use computed circuit-build timeouts to decide when to launch
  801. parallel introduction circuits for hidden services. (Previously,
  802. we would retry after 15 seconds.)
  803. - Don't allow v0 hidden service authorities to act as clients.
  804. Required by fix for bug 3000.
  805. - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
  806. by fix for bug 3000.
  807. - Make hidden services work better in private Tor networks by not
  808. requiring any uptime to join the hidden service descriptor
  809. DHT. Implements ticket 2088.
  810. - Log (at info level) when purging pieces of hidden-service-client
  811. state because of SIGNAL NEWNYM.
  812. o Minor features (controller interface):
  813. - New "GETINFO net/listeners/(type)" controller command to return
  814. a list of addresses and ports that are bound for listeners for a
  815. given connection type. This is useful when the user has configured
  816. "SocksPort auto" and the controller needs to know which port got
  817. chosen. Resolves another part of ticket 3076.
  818. - Have the controller interface give a more useful message than
  819. "Internal Error" in response to failed GETINFO requests.
  820. - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
  821. event, to give information on the current rate of circuit timeouts
  822. over our stored history.
  823. - The 'EXTENDCIRCUIT' control port command can now be used with
  824. a circ id of 0 and no path. This feature will cause Tor to build
  825. a new 'fast' general purpose circuit using its own path selection
  826. algorithms.
  827. - Added a BUILDTIMEOUT_SET controller event to describe changes
  828. to the circuit build timeout.
  829. - New controller command "getinfo config-text". It returns the
  830. contents that Tor would write if you send it a SAVECONF command,
  831. so the controller can write the file to disk itself.
  832. o Minor features (controller protocol):
  833. - Add a new ControlSocketsGroupWritable configuration option: when
  834. it is turned on, ControlSockets are group-writeable by the default
  835. group of the current user. Patch by Jérémy Bobbio; implements
  836. ticket 2972.
  837. - Tor now refuses to create a ControlSocket in a directory that is
  838. world-readable (or group-readable if ControlSocketsGroupWritable
  839. is 0). This is necessary because some operating systems do not
  840. enforce permissions on an AF_UNIX sockets. Permissions on the
  841. directory holding the socket, however, seems to work everywhere.
  842. - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
  843. not. This would lead to a cookie that is still not group readable.
  844. Closes bug 1843. Suggested by katmagic.
  845. - Future-proof the controller protocol a bit by ignoring keyword
  846. arguments we do not recognize.
  847. o Minor features (more useful logging):
  848. - Revise most log messages that refer to nodes by nickname to
  849. instead use the "$key=nickname at address" format. This should be
  850. more useful, especially since nicknames are less and less likely
  851. to be unique. Resolves ticket 3045.
  852. - When an HTTPS proxy reports "403 Forbidden", we now explain
  853. what it means rather than calling it an unexpected status code.
  854. Closes bug 2503. Patch from Michael Yakubovich.
  855. - Rate-limit a warning about failures to download v2 networkstatus
  856. documents. Resolves part of bug 1352.
  857. - Rate-limit the "your application is giving Tor only an IP address"
  858. warning. Addresses bug 2000; bugfix on 0.0.8pre2.
  859. - Rate-limit "Failed to hand off onionskin" warnings.
  860. - When logging a rate-limited warning, we now mention how many messages
  861. got suppressed since the last warning.
  862. - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
  863. 2 no signature, 4 required" messages about consensus signatures
  864. easier to read, and make sure they get logged at the same severity
  865. as the messages explaining which keys are which. Fixes bug 1290.
  866. - Don't warn when we have a consensus that we can't verify because
  867. of missing certificates, unless those certificates are ones
  868. that we have been trying and failing to download. Fixes bug 1145.
  869. o Minor features (log domains):
  870. - Add documentation for configuring logging at different severities in
  871. different log domains. We've had this feature since 0.2.1.1-alpha,
  872. but for some reason it never made it into the manpage. Fixes
  873. bug 2215.
  874. - Make it simpler to specify "All log domains except for A and B".
  875. Previously you needed to say "[*,~A,~B]". Now you can just say
  876. "[~A,~B]".
  877. - Add a "LogMessageDomains 1" option to include the domains of log
  878. messages along with the messages. Without this, there's no way
  879. to use log domains without reading the source or doing a lot
  880. of guessing.
  881. - Add a new "Handshake" log domain for activities that happen
  882. during the TLS handshake.
  883. o Minor features (build process):
  884. - Make compilation with clang possible when using
  885. "--enable-gcc-warnings" by removing two warning options that clang
  886. hasn't implemented yet and by fixing a few warnings. Resolves
  887. ticket 2696.
  888. - Detect platforms that brokenly use a signed size_t, and refuse to
  889. build there. Found and analyzed by doorss and rransom.
  890. - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
  891. Resolves bug 2314.
  892. - Add support for statically linking zlib by specifying
  893. "--enable-static-zlib", to go with our support for statically
  894. linking openssl and libevent. Resolves bug 1358.
  895. - Instead of adding the svn revision to the Tor version string, report
  896. the git commit (when we're building from a git checkout).
  897. - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
  898. system headers.
  899. - New --digests command-line switch to output the digests of the
  900. source files Tor was built with.
  901. - Generate our manpage and HTML documentation using Asciidoc. This
  902. change should make it easier to maintain the documentation, and
  903. produce nicer HTML. The build process fails if asciidoc cannot
  904. be found and building with asciidoc isn't disabled (via the
  905. "--disable-asciidoc" argument to ./configure. Skipping the manpage
  906. speeds up the build considerably.
  907. o Minor features (options / torrc):
  908. - Warn when the same option is provided more than once in a torrc
  909. file, on the command line, or in a single SETCONF statement, and
  910. the option is one that only accepts a single line. Closes bug 1384.
  911. - Warn when the user configures two HiddenServiceDir lines that point
  912. to the same directory. Bugfix on 0.0.6 (the version introducing
  913. HiddenServiceDir); fixes bug 3289.
  914. - Add new "perconnbwrate" and "perconnbwburst" consensus params to
  915. do individual connection-level rate limiting of clients. The torrc
  916. config options with the same names trump the consensus params, if
  917. both are present. Replaces the old "bwconnrate" and "bwconnburst"
  918. consensus params which were broken from 0.2.2.7-alpha through
  919. 0.2.2.14-alpha. Closes bug 1947.
  920. - New config option "WarnUnsafeSocks 0" disables the warning that
  921. occurs whenever Tor receives a socks handshake using a version of
  922. the socks protocol that can only provide an IP address (rather
  923. than a hostname). Setups that do DNS locally over Tor are fine,
  924. and we shouldn't spam the logs in that case.
  925. - New config option "CircuitStreamTimeout" to override our internal
  926. timeout schedule for how many seconds until we detach a stream from
  927. a circuit and try a new circuit. If your network is particularly
  928. slow, you might want to set this to a number like 60.
  929. - New options for SafeLogging to allow scrubbing only log messages
  930. generated while acting as a relay. Specify "SafeLogging relay" if
  931. you want to ensure that only messages known to originate from
  932. client use of the Tor process will be logged unsafely.
  933. - Time and memory units in the configuration file can now be set to
  934. fractional units. For example, "2.5 GB" is now a valid value for
  935. AccountingMax.
  936. - Support line continuations in the torrc config file. If a line
  937. ends with a single backslash character, the newline is ignored, and
  938. the configuration value is treated as continuing on the next line.
  939. Resolves bug 1929.
  940. o Minor features (unit tests):
  941. - Revise our unit tests to use the "tinytest" framework, so we
  942. can run tests in their own processes, have smarter setup/teardown
  943. code, and so on. The unit test code has moved to its own
  944. subdirectory, and has been split into multiple modules.
  945. - Add a unit test for cross-platform directory-listing code.
  946. - Add some forgotten return value checks during unit tests. Found
  947. by coverity.
  948. - Use GetTempDir to find the proper temporary directory location on
  949. Windows when generating temporary files for the unit tests. Patch
  950. by Gisle Vanem.
  951. o Minor features (misc):
  952. - The "torify" script now uses torsocks where available.
  953. - Make Libevent log messages get delivered to controllers later,
  954. and not from inside the Libevent log handler. This prevents unsafe
  955. reentrant Libevent calls while still letting the log messages
  956. get through.
  957. - Certain Tor clients (such as those behind check.torproject.org) may
  958. want to fetch the consensus in an extra early manner. To enable this
  959. a user may now set FetchDirInfoExtraEarly to 1. This also depends on
  960. setting FetchDirInfoEarly to 1. Previous behavior will stay the same
  961. as only certain clients who must have this information sooner should
  962. set this option.
  963. - Expand homedirs passed to tor-checkkey. This should silence a
  964. coverity complaint about passing a user-supplied string into
  965. open() without checking it.
  966. - Make sure to disable DirPort if running as a bridge. DirPorts aren't
  967. used on bridges, and it makes bridge scanning somewhat easier.
  968. - Create the /var/run/tor directory on startup on OpenSUSE if it is
  969. not already created. Patch from Andreas Stieger. Fixes bug 2573.
  970. o Minor bugfixes (relays):
  971. - When a relay decides that its DNS is too broken for it to serve
  972. as an exit server, it advertised itself as a non-exit, but
  973. continued to act as an exit. This could create accidental
  974. partitioning opportunities for users. Instead, if a relay is
  975. going to advertise reject *:* as its exit policy, it should
  976. really act with exit policy "reject *:*". Fixes bug 2366.
  977. Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
  978. - Publish a router descriptor even if generating an extra-info
  979. descriptor fails. Previously we would not publish a router
  980. descriptor without an extra-info descriptor; this can cause fast
  981. exit relays collecting exit-port statistics to drop from the
  982. consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
  983. - When we're trying to guess whether we know our IP address as
  984. a relay, we would log various ways that we failed to guess
  985. our address, but never log that we ended up guessing it
  986. successfully. Now add a log line to help confused and anxious
  987. relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
  988. - For bandwidth accounting, calculate our expected bandwidth rate
  989. based on the time during which we were active and not in
  990. soft-hibernation during the last interval. Previously, we were
  991. also considering the time spent in soft-hibernation. If this
  992. was a long time, we would wind up underestimating our bandwidth
  993. by a lot, and skewing our wakeup time towards the start of the
  994. accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
  995. - Demote a confusing TLS warning that relay operators might get when
  996. someone tries to talk to their ORPort. It is not the operator's
  997. fault, nor can they do anything about it. Fixes bug 1364; bugfix
  998. on 0.2.0.14-alpha.
  999. - Change "Application request when we're believed to be offline."
  1000. notice to "Application request when we haven't used client
  1001. functionality lately.", to clarify that it's not an error. Bugfix
  1002. on 0.0.9.3; fixes bug 1222.
  1003. o Minor bugfixes (bridges):
  1004. - When a client starts or stops using bridges, never use a circuit
  1005. that was built before the configuration change. This behavior could
  1006. put at risk a user who uses bridges to ensure that her traffic
  1007. only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
  1008. bug 3200.
  1009. - Do not reset the bridge descriptor download status every time we
  1010. re-parse our configuration or get a configuration change. Fixes
  1011. bug 3019; bugfix on 0.2.0.3-alpha.
  1012. - Users couldn't configure a regular relay to be their bridge. It
  1013. didn't work because when Tor fetched the bridge descriptor, it found
  1014. that it already had it, and didn't realize that the purpose of the
  1015. descriptor had changed. Now we replace routers with a purpose other
  1016. than bridge with bridge descriptors when fetching them. Bugfix on
  1017. 0.1.1.9-alpha. Fixes bug 1776.
  1018. - In the special case where you configure a public exit relay as your
  1019. bridge, Tor would be willing to use that exit relay as the last
  1020. hop in your circuit as well. Now we fail that circuit instead.
  1021. Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
  1022. o Minor bugfixes (clients):
  1023. - We now ask the other side of a stream (the client or the exit)
  1024. for more data on that stream when the amount of queued data on
  1025. that stream dips low enough. Previously, we wouldn't ask the
  1026. other side for more data until either it sent us more data (which
  1027. it wasn't supposed to do if it had exhausted its window!) or we
  1028. had completely flushed all our queued data. This flow control fix
  1029. should improve throughput. Fixes bug 2756; bugfix on the earliest
  1030. released versions of Tor (svn commit r152).
  1031. - When a client finds that an origin circuit has run out of 16-bit
  1032. stream IDs, we now mark it as unusable for new streams. Previously,
  1033. we would try to close the entire circuit. Bugfix on 0.0.6.
  1034. - Make it explicit that we don't cannibalize one-hop circuits. This
  1035. happens in the wild, but doesn't turn out to be a problem because
  1036. we fortunately don't use those circuits. Many thanks to outofwords
  1037. for the initial analysis and to swissknife who confirmed that
  1038. two-hop circuits are actually created.
  1039. - Resolve an edge case in path weighting that could make us misweight
  1040. our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
  1041. - Make the DNSPort option work with libevent 2.x. Don't alter the
  1042. behaviour for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
  1043. o Minor bugfixes (directory authorities):
  1044. - Make directory authorities more accurate at recording when
  1045. relays that have failed several reachability tests became
  1046. unreachable, so we can provide more accuracy at assigning Stable,
  1047. Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
  1048. - Directory authorities are now more robust to hops back in time
  1049. when calculating router stability. Previously, if a run of uptime
  1050. or downtime appeared to be negative, the calculation could give
  1051. incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
  1052. bug 1035.
  1053. - Directory authorities will now attempt to download consensuses
  1054. if their own efforts to make a live consensus have failed. This
  1055. change means authorities that restart will fetch a valid
  1056. consensus, and it means authorities that didn't agree with the
  1057. current consensus will still fetch and serve it if it has enough
  1058. signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
  1059. - Never vote for a server as "Running" if we have a descriptor for
  1060. it claiming to be hibernating, and that descriptor was published
  1061. more recently than our last contact with the server. Bugfix on
  1062. 0.2.0.3-alpha; fixes bug 911.
  1063. - Directory authorities no longer change their opinion of, or vote on,
  1064. whether a router is Running, unless they have themselves been
  1065. online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
  1066. Fixes bug 1023.
  1067. o Minor bugfixes (hidden services):
  1068. - Log malformed requests for rendezvous descriptors as protocol
  1069. warnings, not warnings. Also, use a more informative log message
  1070. in case someone sees it at log level warning without prior
  1071. info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
  1072. - Accept hidden service descriptors if we think we might be a hidden
  1073. service directory, regardless of what our consensus says. This
  1074. helps robustness, since clients and hidden services can sometimes
  1075. have a more up-to-date view of the network consensus than we do,
  1076. and if they think that the directory authorities list us a HSDir,
  1077. we might actually be one. Related to bug 2732; bugfix on
  1078. 0.2.0.10-alpha.
  1079. - Correct the warning displayed when a rendezvous descriptor exceeds
  1080. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  1081. John Brooks.
  1082. - Clients and hidden services now use HSDir-flagged relays for hidden
  1083. service descriptor downloads and uploads even if the relays have no
  1084. DirPort set and the client has disabled TunnelDirConns. This will
  1085. eventually allow us to give the HSDir flag to relays with no
  1086. DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
  1087. - Only limit the lengths of single HS descriptors, even when multiple
  1088. HS descriptors are published to an HSDir relay in a single POST
  1089. operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
  1090. o Minor bugfixes (controllers):
  1091. - Allow GETINFO fingerprint to return a fingerprint even when
  1092. we have not yet built a router descriptor. Fixes bug 3577;
  1093. bugfix on 0.2.0.1-alpha.
  1094. - Send a SUCCEEDED stream event to the controller when a reverse
  1095. resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
  1096. discovered by katmagic.
  1097. - Remove a trailing asterisk from "exit-policy/default" in the
  1098. output of the control port command "GETINFO info/names". Bugfix
  1099. on 0.1.2.5-alpha.
  1100. - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
  1101. 2917. Bugfix on 0.1.1.1-alpha.
  1102. - When we restart our relay, we might get a successful connection
  1103. from the outside before we've started our reachability tests,
  1104. triggering a warning: "ORPort found reachable, but I have no
  1105. routerinfo yet. Failing to inform controller of success." This
  1106. bug was harmless unless Tor is running under a controller
  1107. like Vidalia, in which case the controller would never get a
  1108. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  1109. fixes bug 1172.
  1110. - When a controller changes TrackHostExits, remove mappings for
  1111. hosts that should no longer have their exits tracked. Bugfix on
  1112. 0.1.0.1-rc.
  1113. - When a controller changes VirtualAddrNetwork, remove any mappings
  1114. for hosts that were automapped to the old network. Bugfix on
  1115. 0.1.1.19-rc.
  1116. - When a controller changes one of the AutomapHosts* options, remove
  1117. any mappings for hosts that should no longer be automapped. Bugfix
  1118. on 0.2.0.1-alpha.
  1119. - Fix an off-by-one error in calculating some controller command
  1120. argument lengths. Fortunately, this mistake is harmless since
  1121. the controller code does redundant NUL termination too. Found by
  1122. boboper. Bugfix on 0.1.1.1-alpha.
  1123. - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
  1124. would return "551 Internal error" rather than "552 Unrecognized key
  1125. ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
  1126. - Don't spam the controller with events when we have no file
  1127. descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
  1128. for log messages was already solved from bug 748.)
  1129. - Emit a GUARD DROPPED controller event for a case we missed.
  1130. - Ensure DNS requests launched by "RESOLVE" commands from the
  1131. controller respect the __LeaveStreamsUnattached setconf options. The
  1132. same goes for requests launched via DNSPort or transparent
  1133. proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
  1134. o Minor bugfixes (config options):
  1135. - Tor used to limit HttpProxyAuthenticator values to 48 characters.
  1136. Change the limit to 512 characters by removing base64 newlines.
  1137. Fixes bug 2752. Fix by Michael Yakubovich.
  1138. - Complain if PublishServerDescriptor is given multiple arguments that
  1139. include 0 or 1. This configuration will be rejected in the future.
  1140. Bugfix on 0.2.0.1-alpha; closes bug 1107.
  1141. - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
  1142. Bugfix on 0.2.0.13-alpha; closes bug 928.
  1143. o Minor bugfixes (log subsystem fixes):
  1144. - When unable to format an address as a string, report its value
  1145. as "???" rather than reusing the last formatted address. Bugfix
  1146. on 0.2.1.5-alpha.
  1147. - Be more consistent in our treatment of file system paths. "~" should
  1148. get expanded to the user's home directory in the Log config option.
  1149. Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
  1150. feature for the -f and --DataDirectory options.
  1151. o Minor bugfixes (memory management):
  1152. - Don't stack-allocate the list of supplementary GIDs when we're
  1153. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  1154. could take up to 256K, which is way too much stack. Found by
  1155. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  1156. - Save a couple bytes in memory allocation every time we escape
  1157. certain characters in a string. Patch from Florian Zumbiehl.
  1158. o Minor bugfixes (protocol correctness):
  1159. - When checking for 1024-bit keys, check for 1024 bits, not 128
  1160. bytes. This allows Tor to correctly discard keys of length 1017
  1161. through 1023. Bugfix on 0.0.9pre5.
  1162. - Require that introduction point keys and onion handshake keys
  1163. have a public exponent of 65537. Starts to fix bug 3207; bugfix
  1164. on 0.2.0.10-alpha.
  1165. - Handle SOCKS messages longer than 128 bytes long correctly, rather
  1166. than waiting forever for them to finish. Fixes bug 2330; bugfix
  1167. on 0.2.0.16-alpha. Found by doorss.
  1168. - Never relay a cell for a circuit we have already destroyed.
  1169. Between marking a circuit as closeable and finally closing it,
  1170. it may have been possible for a few queued cells to get relayed,
  1171. even though they would have been immediately dropped by the next
  1172. OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
  1173. - Never queue a cell for a circuit that's already been marked
  1174. for close.
  1175. - Fix a spec conformance issue: the network-status-version token
  1176. must be the first token in a v3 consensus or vote. Discovered by
  1177. "parakeep". Bugfix on 0.2.0.3-alpha.
  1178. - A networkstatus vote must contain exactly one signature. Spec
  1179. conformance issue. Bugfix on 0.2.0.3-alpha.
  1180. - When asked about a DNS record type we don't support via a
  1181. client DNSPort, reply with NOTIMPL rather than an empty
  1182. reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
  1183. - Make more fields in the controller protocol case-insensitive, since
  1184. control-spec.txt said they were.
  1185. o Minor bugfixes (log messages):
  1186. - Fix a log message that said "bits" while displaying a value in
  1187. bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
  1188. 0.2.0.1-alpha.
  1189. - Downgrade "no current certificates known for authority" message from
  1190. Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
  1191. - Correctly describe errors that occur when generating a TLS object.
  1192. Previously we would attribute them to a failure while generating a
  1193. TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
  1194. bug 1994.
  1195. - Fix an instance where a Tor directory mirror might accidentally
  1196. log the IP address of a misbehaving Tor client. Bugfix on
  1197. 0.1.0.1-rc.
  1198. - Stop logging at severity 'warn' when some other Tor client tries
  1199. to establish a circuit with us using weak DH keys. It's a protocol
  1200. violation, but that doesn't mean ordinary users need to hear about
  1201. it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
  1202. - If your relay can't keep up with the number of incoming create
  1203. cells, it would log one warning per failure into your logs. Limit
  1204. warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
  1205. o Minor bugfixes (build fixes):
  1206. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  1207. - When warning about missing zlib development packages during compile,
  1208. give the correct package names. Bugfix on 0.2.0.1-alpha.
  1209. - Fix warnings that newer versions of autoconf produce during
  1210. ./autogen.sh. These warnings appear to be harmless in our case,
  1211. but they were extremely verbose. Fixes bug 2020.
  1212. - Squash a compile warning on OpenBSD. Reported by Tas; fixes
  1213. bug 1848.
  1214. o Minor bugfixes (portability):
  1215. - Write several files in text mode, on OSes that distinguish text
  1216. mode from binary mode (namely, Windows). These files are:
  1217. 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
  1218. that collect those statistics; 'client_keys' and 'hostname' for
  1219. hidden services that use authentication; and (in the tor-gencert
  1220. utility) newly generated identity and signing keys. Previously,
  1221. we wouldn't specify text mode or binary mode, leading to an
  1222. assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
  1223. the DirRecordUsageByCountry option which would have triggered
  1224. the assertion failure was added), although this assertion failure
  1225. would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
  1226. - Selectively disable deprecation warnings on OS X because Lion
  1227. started deprecating the shipped copy of openssl. Fixes bug 3643.
  1228. - Use a wide type to hold sockets when built for 64-bit Windows.
  1229. Fixes bug 3270.
  1230. - Fix an issue that prevented static linking of libevent on
  1231. some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
  1232. where we introduced the "--with-static-libevent" configure option.
  1233. - Fix a bug with our locking implementation on Windows that couldn't
  1234. correctly detect when a file was already locked. Fixes bug 2504,
  1235. bugfix on 0.2.1.6-alpha.
  1236. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  1237. enabled.
  1238. - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
  1239. Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
  1240. "piebeer".
  1241. o Minor bugfixes (code correctness):
  1242. - Always NUL-terminate the sun_path field of a sockaddr_un before
  1243. passing it to the kernel. (Not a security issue: kernels are
  1244. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  1245. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  1246. - Make connection_printf_to_buf()'s behaviour sane. Its callers
  1247. expect it to emit a CRLF iff the format string ends with CRLF;
  1248. it actually emitted a CRLF iff (a) the format string ended with
  1249. CRLF or (b) the resulting string was over 1023 characters long or
  1250. (c) the format string did not end with CRLF *and* the resulting
  1251. string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
  1252. fixes part of bug 3407.
  1253. - Make send_control_event_impl()'s behaviour sane. Its callers
  1254. expect it to always emit a CRLF at the end of the string; it
  1255. might have emitted extra control characters as well. Bugfix on
  1256. 0.1.1.9-alpha; fixes another part of bug 3407.
  1257. - Make crypto_rand_int() check the value of its input correctly.
  1258. Previously, it accepted values up to UINT_MAX, but could return a
  1259. negative number if given a value above INT_MAX+1. Found by George
  1260. Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
  1261. - Fix a potential null-pointer dereference while computing a
  1262. consensus. Bugfix on tor-0.2.0.3-alpha, found with the help of
  1263. clang's analyzer.
  1264. - If we fail to compute the identity digest of a v3 legacy keypair,
  1265. warn, and don't use a buffer-full of junk instead. Bugfix on
  1266. 0.2.1.1-alpha; fixes bug 3106.
  1267. - Resolve an untriggerable issue in smartlist_string_num_isin(),
  1268. where if the function had ever in the future been used to check
  1269. for the presence of a too-large number, it would have given an
  1270. incorrect result. (Fortunately, we only used it for 16-bit
  1271. values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
  1272. - Be more careful about reporting the correct error from a failed
  1273. connect() system call. Under some circumstances, it was possible to
  1274. look at an incorrect value for errno when sending the end reason.
  1275. Bugfix on 0.1.0.1-rc.
  1276. - Correctly handle an "impossible" overflow cases in connection byte
  1277. counting, where we write or read more than 4GB on an edge connection
  1278. in a single second. Bugfix on 0.1.2.8-beta.
  1279. - Avoid a double mark-for-free warning when failing to attach a
  1280. transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
  1281. bug 2279.
  1282. - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
  1283. found by "cypherpunks". This bug was introduced before the first
  1284. Tor release, in svn commit r110.
  1285. - Fix a bug in bandwidth history state parsing that could have been
  1286. triggered if a future version of Tor ever changed the timing
  1287. granularity at which bandwidth history is measured. Bugfix on
  1288. Tor 0.1.1.11-alpha.
  1289. - Add assertions to check for overflow in arguments to
  1290. base32_encode() and base32_decode(); fix a signed-unsigned
  1291. comparison there too. These bugs are not actually reachable in Tor,
  1292. but it's good to prevent future errors too. Found by doorss.
  1293. - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
  1294. "memcpyfail".
  1295. - Set target port in get_interface_address6() correctly. Bugfix
  1296. on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
  1297. - Fix an impossible-to-actually-trigger buffer overflow in relay
  1298. descriptor generation. Bugfix on 0.1.0.15.
  1299. - Fix numerous small code-flaws found by Coverity Scan Rung 3.
  1300. o Minor bugfixes (code improvements):
  1301. - After we free an internal connection structure, overwrite it
  1302. with a different memory value than we use for overwriting a freed
  1303. internal circuit structure. Should help with debugging. Suggested
  1304. by bug 1055.
  1305. - If OpenSSL fails to make a duplicate of a private or public key, log
  1306. an error message and try to exit cleanly. May help with debugging
  1307. if bug 1209 ever remanifests.
  1308. - Some options used different conventions for uppercasing of acronyms
  1309. when comparing manpage and source. Fix those in favor of the
  1310. manpage, as it makes sense to capitalize acronyms.
  1311. - Take a first step towards making or.h smaller by splitting out
  1312. function definitions for all source files in src/or/. Leave
  1313. structures and defines in or.h for now.
  1314. - Remove a few dead assignments during router parsing. Found by
  1315. coverity.
  1316. - Don't use 1-bit wide signed bit fields. Found by coverity.
  1317. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  1318. None of the cases where we did this before were wrong, but by making
  1319. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  1320. - The memarea code now uses a sentinel value at the end of each area
  1321. to make sure nothing writes beyond the end of an area. This might
  1322. help debug some conceivable causes of bug 930.
  1323. - Always treat failure to allocate an RSA key as an unrecoverable
  1324. allocation error.
  1325. - Add some more defensive programming for architectures that can't
  1326. handle unaligned integer accesses. We don't know of any actual bugs
  1327. right now, but that's the best time to fix them. Fixes bug 1943.
  1328. o Minor bugfixes (misc):
  1329. - Fix a rare bug in rend_fn unit tests: we would fail a test when
  1330. a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
  1331. on 0.2.0.10-alpha; fixes bug 1808.
  1332. - Where available, use Libevent 2.0's periodic timers so that our
  1333. once-per-second cleanup code gets called even more closely to
  1334. once per second than it would otherwise. Fixes bug 943.
  1335. - Ignore OutboundBindAddress when connecting to localhost.
  1336. Connections to localhost need to come _from_ localhost, or else
  1337. local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
  1338. refuse to listen.
  1339. - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
  1340. too.
  1341. - If any of the v3 certs we download are unparseable, we should
  1342. actually notice the failure so we don't retry indefinitely. Bugfix
  1343. on 0.2.0.x; reported by "rotator".
  1344. - When Tor fails to parse a descriptor of any kind, dump it to disk.
  1345. Might help diagnosing bug 1051.
  1346. - Make our 'torify' script more portable; if we have only one of
  1347. 'torsocks' or 'tsocks' installed, don't complain to the user;
  1348. and explain our warning about tsocks better.
  1349. - Fix some urls in the exit notice file and make it XHTML1.1 strict
  1350. compliant. Based on a patch from Christian Kujau.
  1351. o Documentation changes:
  1352. - Modernize the doxygen configuration file slightly. Fixes bug 2707.
  1353. - Resolve all doxygen warnings except those for missing documentation.
  1354. Fixes bug 2705.
  1355. - Add doxygen documentation for more functions, fields, and types.
  1356. - Convert the HACKING file to asciidoc, and add a few new sections
  1357. to it, explaining how we use Git, how we make changelogs, and
  1358. what should go in a patch.
  1359. - Document the default socks host and port (127.0.0.1:9050) for
  1360. tor-resolve.
  1361. - Removed some unnecessary files from the source distribution. The
  1362. AUTHORS file has now been merged into the people page on the
  1363. website. The roadmaps and design doc can now be found in the
  1364. projects directory in svn.
  1365. o Deprecated and removed features (config):
  1366. - Remove the torrc.complete file. It hasn't been kept up to date
  1367. and users will have better luck checking out the manpage.
  1368. - Remove the HSAuthorityRecordStats option that version 0 hidden
  1369. service authorities could use to track statistics of overall v0
  1370. hidden service usage.
  1371. - Remove the obsolete "NoPublish" option; it has been flagged
  1372. as obsolete and has produced a warning since 0.1.1.18-rc.
  1373. - Caches no longer download and serve v2 networkstatus documents
  1374. unless FetchV2Networkstatus flag is set: these documents haven't
  1375. haven't been used by clients or relays since 0.2.0.x. Resolves
  1376. bug 3022.
  1377. o Deprecated and removed features (controller):
  1378. - The controller no longer accepts the old obsolete "addr-mappings/"
  1379. or "unregistered-servers-" GETINFO values.
  1380. - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
  1381. always on; using them is necessary for correct forward-compatible
  1382. controllers.
  1383. o Deprecated and removed features (misc):
  1384. - Hidden services no longer publish version 0 descriptors, and clients
  1385. do not request or use version 0 descriptors. However, the old hidden
  1386. service authorities still accept and serve version 0 descriptors
  1387. when contacted by older hidden services/clients.
  1388. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  1389. anything since 0.2.1.16-rc.
  1390. - Remove everything related to building the expert bundle for OS X.
  1391. It has confused many users, doesn't work right on OS X 10.6,
  1392. and is hard to get rid of once installed. Resolves bug 1274.
  1393. - Remove support for .noconnect style addresses. Nobody was using
  1394. them, and they provided another avenue for detecting Tor users
  1395. via application-level web tricks.
  1396. - When we fixed bug 1038 we had to put in a restriction not to send
  1397. RELAY_EARLY cells on rend circuits. This was necessary as long
  1398. as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
  1399. active. Now remove this obsolete check. Resolves bug 2081.
  1400. - Remove workaround code to handle directory responses from servers
  1401. that had bug 539 (they would send HTTP status 503 responses _and_
  1402. send a body too). Since only server versions before
  1403. 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
  1404. keep the workaround in place.
  1405. - Remove the old 'fuzzy time' logic. It was supposed to be used for
  1406. handling calculations where we have a known amount of clock skew and
  1407. an allowed amount of unknown skew. But we only used it in three
  1408. places, and we never adjusted the known/unknown skew values. This is
  1409. still something we might want to do someday, but if we do, we'll
  1410. want to do it differently.
  1411. - Remove the "--enable-iphone" option to ./configure. According to
  1412. reports from Marco Bonetti, Tor builds fine without any special
  1413. tweaking on recent iPhone SDK versions.
  1414. Changes in version 0.2.1.30 - 2011-02-23
  1415. Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
  1416. change is a slight tweak to Tor's TLS handshake that makes relays
  1417. and bridges that run this new version reachable from Iran again.
  1418. We don't expect this tweak will win the arms race long-term, but it
  1419. buys us time until we roll out a better solution.
  1420. o Major bugfixes:
  1421. - Stop sending a CLOCK_SKEW controller status event whenever
  1422. we fetch directory information from a relay that has a wrong clock.
  1423. Instead, only inform the controller when it's a trusted authority
  1424. that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
  1425. the rest of bug 1074.
  1426. - Fix a bounds-checking error that could allow an attacker to
  1427. remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
  1428. Found by "piebeer".
  1429. - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
  1430. Tor would ignore their RelayBandwidthBurst setting,
  1431. potentially using more bandwidth than expected. Bugfix on
  1432. 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
  1433. - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
  1434. hidserv" in her torrc. The 'hidserv' argument never controlled
  1435. publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
  1436. o Minor features:
  1437. - Adjust our TLS Diffie-Hellman parameters to match those used by
  1438. Apache's mod_ssl.
  1439. - Update to the February 1 2011 Maxmind GeoLite Country database.
  1440. o Minor bugfixes:
  1441. - Check for and reject overly long directory certificates and
  1442. directory tokens before they have a chance to hit any assertions.
  1443. Bugfix on 0.2.1.28. Found by "doorss".
  1444. - Bring the logic that gathers routerinfos and assesses the
  1445. acceptability of circuits into line. This prevents a Tor OP from
  1446. getting locked in a cycle of choosing its local OR as an exit for a
  1447. path (due to a .exit request) and then rejecting the circuit because
  1448. its OR is not listed yet. It also prevents Tor clients from using an
  1449. OR running in the same instance as an exit (due to a .exit request)
  1450. if the OR does not meet the same requirements expected of an OR
  1451. running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
  1452. o Packaging changes:
  1453. - Stop shipping the Tor specs files and development proposal documents
  1454. in the tarball. They are now in a separate git repository at
  1455. git://git.torproject.org/torspec.git
  1456. - Do not include Git version tags as though they are SVN tags when
  1457. generating a tarball from inside a repository that has switched
  1458. between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  1459. Changes in version 0.2.1.29 - 2011-01-15
  1460. Tor 0.2.1.29 continues our recent code security audit work. The main
  1461. fix resolves a remote heap overflow vulnerability that can allow remote
  1462. code execution. Other fixes address a variety of assert and crash bugs,
  1463. most of which we think are hard to exploit remotely.
  1464. o Major bugfixes (security):
  1465. - Fix a heap overflow bug where an adversary could cause heap
  1466. corruption. This bug probably allows remote code execution
  1467. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  1468. 0.1.2.10-rc.
  1469. - Prevent a denial-of-service attack by disallowing any
  1470. zlib-compressed data whose compression factor is implausibly
  1471. high. Fixes part of bug 2324; reported by "doorss".
  1472. - Zero out a few more keys in memory before freeing them. Fixes
  1473. bug 2384 and part of bug 2385. These key instances found by
  1474. "cypherpunks", based on Andrew Case's report about being able
  1475. to find sensitive data in Tor's memory space if you have enough
  1476. permissions. Bugfix on 0.0.2pre9.
  1477. o Major bugfixes (crashes):
  1478. - Prevent calls to Libevent from inside Libevent log handlers.
  1479. This had potential to cause a nasty set of crashes, especially
  1480. if running Libevent with debug logging enabled, and running
  1481. Tor with a controller watching for low-severity log messages.
  1482. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  1483. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  1484. underflow errors there too. Fixes the other part of bug 2324.
  1485. - Fix a bug where we would assert if we ever had a
  1486. cached-descriptors.new file (or another file read directly into
  1487. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  1488. on 0.2.1.25. Found by doorss.
  1489. - Fix some potential asserts and parsing issues with grossly
  1490. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  1491. Found by doorss.
  1492. o Minor bugfixes (other):
  1493. - Fix a bug with handling misformed replies to reverse DNS lookup
  1494. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  1495. bug reported by doorss.
  1496. - Fix compilation on mingw when a pthreads compatibility library
  1497. has been installed. (We don't want to use it, so we shouldn't
  1498. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  1499. - Fix a bug where we would declare that we had run out of virtual
  1500. addresses when the address space was only half-exhausted. Bugfix
  1501. on 0.1.2.1-alpha.
  1502. - Correctly handle the case where AutomapHostsOnResolve is set but
  1503. no virtual addresses are available. Fixes bug 2328; bugfix on
  1504. 0.1.2.1-alpha. Bug found by doorss.
  1505. - Correctly handle wrapping around when we run out of virtual
  1506. address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
  1507. o Minor features:
  1508. - Update to the January 1 2011 Maxmind GeoLite Country database.
  1509. - Introduce output size checks on all of our decryption functions.
  1510. o Build changes:
  1511. - Tor does not build packages correctly with Automake 1.6 and earlier;
  1512. added a check to Makefile.am to make sure that we're building with
  1513. Automake 1.7 or later.
  1514. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  1515. because we built it with a too-old version of automake. Thus that
  1516. release broke ./configure --enable-openbsd-malloc, which is popular
  1517. among really fast exit relays on Linux.
  1518. Changes in version 0.2.1.28 - 2010-12-17
  1519. Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
  1520. exploitable bugs. We also took this opportunity to change the IP address
  1521. for one of our directory authorities, and to update the geoip database
  1522. we ship.
  1523. o Major bugfixes:
  1524. - Fix a remotely exploitable bug that could be used to crash instances
  1525. of Tor remotely by overflowing on the heap. Remote-code execution
  1526. hasn't been confirmed, but can't be ruled out. Everyone should
  1527. upgrade. Bugfix on the 0.1.1 series and later.
  1528. o Directory authority changes:
  1529. - Change IP address and ports for gabelmoo (v3 directory authority).
  1530. o Minor features:
  1531. - Update to the December 1 2010 Maxmind GeoLite Country database.
  1532. Changes in version 0.2.1.27 - 2010-11-23
  1533. Yet another OpenSSL security patch broke its compatibility with Tor:
  1534. Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
  1535. also took this opportunity to fix several crash bugs, integrate a new
  1536. directory authority, and update the bundled GeoIP database.
  1537. o Major bugfixes:
  1538. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  1539. No longer set the tlsext_host_name extension on server SSL objects;
  1540. but continue to set it on client SSL objects. Our goal in setting
  1541. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  1542. bugfix on 0.2.1.1-alpha.
  1543. - Do not log messages to the controller while shrinking buffer
  1544. freelists. Doing so would sometimes make the controller connection
  1545. try to allocate a buffer chunk, which would mess up the internals
  1546. of the freelist and cause an assertion failure. Fixes bug 1125;
  1547. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  1548. - Learn our external IP address when we're a relay or bridge, even if
  1549. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  1550. where we introduced bridge relays that don't need to publish to
  1551. be useful. Fixes bug 2050.
  1552. - Do even more to reject (and not just ignore) annotations on
  1553. router descriptors received anywhere but from the cache. Previously
  1554. we would ignore such annotations at first, but cache them to disk
  1555. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  1556. - When you're using bridges and your network goes away and your
  1557. bridges get marked as down, recover when you attempt a new socks
  1558. connection (if the network is back), rather than waiting up to an
  1559. hour to try fetching new descriptors for your bridges. Bugfix on
  1560. 0.2.0.3-alpha; fixes bug 1981.
  1561. o Major features:
  1562. - Move to the November 2010 Maxmind GeoLite country db (rather
  1563. than the June 2009 ip-to-country GeoIP db) for our statistics that
  1564. count how many users relays are seeing from each country. Now we'll
  1565. have more accurate data, especially for many African countries.
  1566. o New directory authorities:
  1567. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  1568. authority.
  1569. o Minor bugfixes:
  1570. - Fix an assertion failure that could occur in directory caches or
  1571. bridge users when using a very short voting interval on a testing
  1572. network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
  1573. 0.2.0.8-alpha.
  1574. - Enforce multiplicity rules when parsing annotations. Bugfix on
  1575. 0.2.0.8-alpha. Found by piebeer.
  1576. - Allow handshaking OR connections to take a full KeepalivePeriod
  1577. seconds to handshake. Previously, we would close them after
  1578. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  1579. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  1580. for analysis help.
  1581. - When building with --enable-gcc-warnings on OpenBSD, disable
  1582. warnings in system headers. This makes --enable-gcc-warnings
  1583. pass on OpenBSD 4.8.
  1584. o Minor features:
  1585. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  1586. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  1587. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  1588. Servers can start sending this code when enough clients recognize
  1589. it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
  1590. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  1591. Patch from mingw-san.
  1592. o Removed files:
  1593. - Remove the old debian/ directory from the main Tor distribution.
  1594. The official Tor-for-debian git repository lives at the URL
  1595. https://git.torproject.org/debian/tor.git
  1596. - Stop shipping the old doc/website/ directory in the tarball. We
  1597. changed the website format in late 2010, and what we shipped in
  1598. 0.2.1.26 really wasn't that useful anyway.
  1599. Changes in version 0.2.1.26 - 2010-05-02
  1600. Tor 0.2.1.26 addresses the recent connection and memory overload
  1601. problems we've been seeing on relays, especially relays with their
  1602. DirPort open. If your relay has been crashing, or you turned it off
  1603. because it used too many resources, give this release a try.
  1604. This release also fixes yet another instance of broken OpenSSL libraries
  1605. that was causing some relays to drop out of the consensus.
  1606. o Major bugfixes:
  1607. - Teach relays to defend themselves from connection overload. Relays
  1608. now close idle circuits early if it looks like they were intended
  1609. for directory fetches. Relays are also more aggressive about closing
  1610. TLS connections that have no circuits on them. Such circuits are
  1611. unlikely to be re-used, and tens of thousands of them were piling
  1612. up at the fast relays, causing the relays to run out of sockets
  1613. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  1614. their directory fetches over TLS).
  1615. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  1616. that claim to be earlier than 0.9.8m, but which have in reality
  1617. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  1618. behavior. Possible fix for some cases of bug 1346.
  1619. - Directory mirrors were fetching relay descriptors only from v2
  1620. directory authorities, rather than v3 authorities like they should.
  1621. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  1622. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  1623. o Minor bugfixes:
  1624. - Finally get rid of the deprecated and now harmful notion of "clique
  1625. mode", where directory authorities maintain TLS connections to
  1626. every other relay.
  1627. o Testsuite fixes:
  1628. - In the util/threads test, no longer free the test_mutex before all
  1629. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  1630. - The master thread could starve the worker threads quite badly on
  1631. certain systems, causing them to run only partially in the allowed
  1632. window. This resulted in test failures. Now the master thread sleeps
  1633. occasionally for a few microseconds while the two worker-threads
  1634. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  1635. Changes in version 0.2.1.25 - 2010-03-16
  1636. Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  1637. prevent relays from guessing their IP address correctly. It also fixes
  1638. several minor potential security bugs.
  1639. o Major bugfixes:
  1640. - Fix a regression from our patch for bug 1244 that caused relays
  1641. to guess their IP address incorrectly if they didn't set Address
  1642. in their torrc and/or their address fails to resolve. Bugfix on
  1643. 0.2.1.23; fixes bug 1269.
  1644. - When freeing a session key, zero it out completely. We only zeroed
  1645. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  1646. patched by ekir. Fixes bug 1254.
  1647. o Minor bugfixes:
  1648. - Fix a dereference-then-NULL-check sequence when publishing
  1649. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  1650. bug 1255.
  1651. - Fix another dereference-then-NULL-check sequence. Bugfix on
  1652. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  1653. - Make sure we treat potentially not NUL-terminated strings correctly.
  1654. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  1655. Changes in version 0.2.1.24 - 2010-02-21
  1656. Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  1657. for sure!
  1658. o Minor bugfixes:
  1659. - Work correctly out-of-the-box with even more vendor-patched versions
  1660. of OpenSSL. In particular, make it so Debian and OS X don't need
  1661. customized patches to run/build.
  1662. Changes in version 0.2.1.23 - 2010-02-13
  1663. Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  1664. again on the latest OS X, and updates the location of a directory
  1665. authority.
  1666. o Major bugfixes (performance):
  1667. - We were selecting our guards uniformly at random, and then weighting
  1668. which of our guards we'd use uniformly at random. This imbalance
  1669. meant that Tor clients were severely limited on throughput (and
  1670. probably latency too) by the first hop in their circuit. Now we
  1671. select guards weighted by currently advertised bandwidth. We also
  1672. automatically discard guards picked using the old algorithm. Fixes
  1673. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  1674. o Major bugfixes:
  1675. - Make Tor work again on the latest OS X: when deciding whether to
  1676. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  1677. version at run-time, not compile time. We need to do this because
  1678. Apple doesn't update its dev-tools headers when it updates its
  1679. libraries in a security patch.
  1680. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  1681. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  1682. a memory leak when requesting a hidden service descriptor we've
  1683. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  1684. by aakova.
  1685. o Minor bugfixes:
  1686. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  1687. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  1688. o Minor features:
  1689. - Avoid a mad rush at the beginning of each month when each client
  1690. rotates half of its guards. Instead we spread the rotation out
  1691. throughout the month, but we still avoid leaving a precise timestamp
  1692. in the state file about when we first picked the guard. Improves
  1693. over the behavior introduced in 0.1.2.17.
  1694. Changes in version 0.2.1.22 - 2010-01-19
  1695. Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  1696. authorities -- it would tell you its whole history of bridge descriptors
  1697. if you make the right directory request. This stable update also
  1698. rotates two of the seven v3 directory authority keys and locations.
  1699. o Directory authority changes:
  1700. - Rotate keys (both v3 identity and relay identity) for moria1
  1701. and gabelmoo.
  1702. o Major bugfixes:
  1703. - Stop bridge directory authorities from answering dbg-stability.txt
  1704. directory queries, which would let people fetch a list of all
  1705. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  1706. Changes in version 0.2.1.21 - 2009-12-21
  1707. Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  1708. library. If you use Tor on Linux / Unix and you're getting SSL
  1709. renegotiation errors, upgrading should help. We also recommend an
  1710. upgrade if you're an exit relay.
  1711. o Major bugfixes:
  1712. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  1713. handshake from working unless we explicitly tell OpenSSL that we
  1714. are using SSL renegotiation safely. We are, of course, but OpenSSL
  1715. 0.9.8l won't work unless we say we are.
  1716. - Avoid crashing if the client is trying to upload many bytes and the
  1717. circuit gets torn down at the same time, or if the flip side
  1718. happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
  1719. o Minor bugfixes:
  1720. - Do not refuse to learn about authority certs and v2 networkstatus
  1721. documents that are older than the latest consensus. This bug might
  1722. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  1723. Spotted and fixed by xmux.
  1724. - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
  1725. trigger platform-specific option misparsing case found by Coverity
  1726. Scan.
  1727. - Fix a compilation warning on Fedora 12 by removing an impossible-to-
  1728. trigger assert. Fixes bug 1173.
  1729. Changes in version 0.2.1.20 - 2009-10-15
  1730. Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  1731. services at once, prepares for more performance improvements, and
  1732. fixes a bunch of smaller bugs.
  1733. The Windows and OS X bundles also include a more recent Vidalia,
  1734. and switch from Privoxy to Polipo.
  1735. The OS X installers are now drag and drop. It's best to un-install
  1736. Tor/Vidalia and then install this new bundle, rather than upgrade. If
  1737. you want to upgrade, you'll need to update the paths for Tor and Polipo
  1738. in the Vidalia Settings window.
  1739. o Major bugfixes:
  1740. - Send circuit or stream sendme cells when our window has decreased
  1741. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  1742. by Karsten when testing the "reduce circuit window" performance
  1743. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  1744. before the release of Tor 0.0.0. This is the new winner of the
  1745. oldest-bug prize.
  1746. - Fix a remotely triggerable memory leak when a consensus document
  1747. contains more than one signature from the same voter. Bugfix on
  1748. 0.2.0.3-alpha.
  1749. - Avoid segfault in rare cases when finishing an introduction circuit
  1750. as a client and finding out that we don't have an introduction key
  1751. for it. Fixes bug 1073. Reported by Aaron Swartz.
  1752. o Major features:
  1753. - Tor now reads the "circwindow" parameter out of the consensus,
  1754. and uses that value for its circuit package window rather than the
  1755. default of 1000 cells. Begins the implementation of proposal 168.
  1756. o New directory authorities:
  1757. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  1758. authority.
  1759. - Move moria1 and tonga to alternate IP addresses.
  1760. o Minor bugfixes:
  1761. - Fix a signed/unsigned compile warning in 0.2.1.19.
  1762. - Fix possible segmentation fault on directory authorities. Bugfix on
  1763. 0.2.1.14-rc.
  1764. - Fix an extremely rare infinite recursion bug that could occur if
  1765. we tried to log a message after shutting down the log subsystem.
  1766. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  1767. - Fix an obscure bug where hidden services on 64-bit big-endian
  1768. systems might mis-read the timestamp in v3 introduce cells, and
  1769. refuse to connect back to the client. Discovered by "rotor".
  1770. Bugfix on 0.2.1.6-alpha.
  1771. - We were triggering a CLOCK_SKEW controller status event whenever
  1772. we connect via the v2 connection protocol to any relay that has
  1773. a wrong clock. Instead, we should only inform the controller when
  1774. it's a trusted authority that claims our clock is wrong. Bugfix
  1775. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  1776. - We were telling the controller about CHECKING_REACHABILITY and
  1777. REACHABILITY_FAILED status events whenever we launch a testing
  1778. circuit or notice that one has failed. Instead, only tell the
  1779. controller when we want to inform the user of overall success or
  1780. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  1781. by SwissTorExit.
  1782. - Don't warn when we're using a circuit that ends with a node
  1783. excluded in ExcludeExitNodes, but the circuit is not used to access
  1784. the outside world. This should help fix bug 1090. Bugfix on
  1785. 0.2.1.6-alpha.
  1786. - Work around a small memory leak in some versions of OpenSSL that
  1787. stopped the memory used by the hostname TLS extension from being
  1788. freed.
  1789. o Minor features:
  1790. - Add a "getinfo status/accepted-server-descriptor" controller
  1791. command, which is the recommended way for controllers to learn
  1792. whether our server descriptor has been successfully received by at
  1793. least on directory authority. Un-recommend good-server-descriptor
  1794. getinfo and status events until we have a better design for them.
  1795. Changes in version 0.2.1.19 - 2009-07-28
  1796. Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  1797. services.
  1798. o Major bugfixes:
  1799. - Make accessing hidden services on 0.2.1.x work right again.
  1800. Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
  1801. part of patch provided by "optimist".
  1802. o Minor features:
  1803. - When a relay/bridge is writing out its identity key fingerprint to
  1804. the "fingerprint" file and to its logs, write it without spaces. Now
  1805. it will look like the fingerprints in our bridges documentation,
  1806. and confuse fewer users.
  1807. o Minor bugfixes:
  1808. - Relays no longer publish a new server descriptor if they change
  1809. their MaxAdvertisedBandwidth config option but it doesn't end up
  1810. changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
  1811. fixes bug 1026. Patch from Sebastian.
  1812. - Avoid leaking memory every time we get a create cell but we have
  1813. so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
  1814. fixes bug 1034. Reported by BarkerJr.
  1815. Changes in version 0.2.1.18 - 2009-07-24
  1816. Tor 0.2.1.18 lays the foundations for performance improvements,
  1817. adds status events to help users diagnose bootstrap problems, adds
  1818. optional authentication/authorization for hidden services, fixes a
  1819. variety of potential anonymity problems, and includes a huge pile of
  1820. other features and bug fixes.
  1821. o Major features (clients):
  1822. - Start sending "bootstrap phase" status events to the controller,
  1823. so it can keep the user informed of progress fetching directory
  1824. information and establishing circuits. Also inform the controller
  1825. if we think we're stuck at a particular bootstrap phase. Implements
  1826. proposal 137.
  1827. - Clients replace entry guards that were chosen more than a few months
  1828. ago. This change should significantly improve client performance,
  1829. especially once more people upgrade, since relays that have been
  1830. a guard for a long time are currently overloaded.
  1831. - Network status consensus documents and votes now contain bandwidth
  1832. information for each relay. Clients use the bandwidth values
  1833. in the consensus, rather than the bandwidth values in each
  1834. relay descriptor. This approach opens the door to more accurate
  1835. bandwidth estimates once the directory authorities start doing
  1836. active measurements. Implements part of proposal 141.
  1837. o Major features (relays):
  1838. - Disable and refactor some debugging checks that forced a linear scan
  1839. over the whole server-side DNS cache. These accounted for over 50%
  1840. of CPU time on a relatively busy exit node's gprof profile. Also,
  1841. disable some debugging checks that appeared in exit node profile
  1842. data. Found by Jacob.
  1843. - New DirPortFrontPage option that takes an html file and publishes
  1844. it as "/" on the DirPort. Now relay operators can provide a
  1845. disclaimer without needing to set up a separate webserver. There's
  1846. a sample disclaimer in contrib/tor-exit-notice.html.
  1847. o Major features (hidden services):
  1848. - Make it possible to build hidden services that only certain clients
  1849. are allowed to connect to. This is enforced at several points,
  1850. so that unauthorized clients are unable to send INTRODUCE cells
  1851. to the service, or even (depending on the type of authentication)
  1852. to learn introduction points. This feature raises the bar for
  1853. certain kinds of active attacks against hidden services. Design
  1854. and code by Karsten Loesing. Implements proposal 121.
  1855. - Relays now store and serve v2 hidden service descriptors by default,
  1856. i.e., the new default value for HidServDirectoryV2 is 1. This is
  1857. the last step in proposal 114, which aims to make hidden service
  1858. lookups more reliable.
  1859. o Major features (path selection):
  1860. - ExitNodes and Exclude*Nodes config options now allow you to restrict
  1861. by country code ("{US}") or IP address or address pattern
  1862. ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
  1863. refinement to decide what config options should take priority if
  1864. you ask to both use a particular node and exclude it.
  1865. o Major features (misc):
  1866. - When building a consensus, do not include routers that are down.
  1867. This cuts down 30% to 40% on consensus size. Implements proposal
  1868. 138.
  1869. - New TestingTorNetwork config option to allow adjustment of
  1870. previously constant values that could slow bootstrapping. Implements
  1871. proposal 135. Patch from Karsten.
  1872. - Convert many internal address representations to optionally hold
  1873. IPv6 addresses. Generate and accept IPv6 addresses in many protocol
  1874. elements. Make resolver code handle nameservers located at IPv6
  1875. addresses.
  1876. - More work on making our TLS handshake blend in: modify the list
  1877. of ciphers advertised by OpenSSL in client mode to even more
  1878. closely resemble a common web browser. We cheat a little so that
  1879. we can advertise ciphers that the locally installed OpenSSL doesn't
  1880. know about.
  1881. - Use the TLS1 hostname extension to more closely resemble browser
  1882. behavior.
  1883. o Security fixes (anonymity/entropy):
  1884. - Never use a connection with a mismatched address to extend a
  1885. circuit, unless that connection is canonical. A canonical
  1886. connection is one whose address is authenticated by the router's
  1887. identity key, either in a NETINFO cell or in a router descriptor.
  1888. - Implement most of proposal 110: The first K cells to be sent
  1889. along a circuit are marked as special "early" cells; only K "early"
  1890. cells will be allowed. Once this code is universal, we can block
  1891. certain kinds of denial-of-service attack by requiring that EXTEND
  1892. commands must be sent using an "early" cell.
  1893. - Resume using OpenSSL's RAND_poll() for better (and more portable)
  1894. cross-platform entropy collection again. We used to use it, then
  1895. stopped using it because of a bug that could crash systems that
  1896. called RAND_poll when they had a lot of fds open. It looks like the
  1897. bug got fixed in late 2006. Our new behavior is to call RAND_poll()
  1898. at startup, and to call RAND_poll() when we reseed later only if
  1899. we have a non-buggy OpenSSL version.
  1900. - When the client is choosing entry guards, now it selects at most
  1901. one guard from a given relay family. Otherwise we could end up with
  1902. all of our entry points into the network run by the same operator.
  1903. Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
  1904. - Do not use or believe expired v3 authority certificates. Patch
  1905. from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
  1906. - Drop begin cells to a hidden service if they come from the middle
  1907. of a circuit. Patch from lark.
  1908. - When we erroneously receive two EXTEND cells for the same circuit
  1909. ID on the same connection, drop the second. Patch from lark.
  1910. - Authorities now vote for the Stable flag for any router whose
  1911. weighted MTBF is at least 5 days, regardless of the mean MTBF.
  1912. - Clients now never report any stream end reason except 'MISC'.
  1913. Implements proposal 148.
  1914. o Major bugfixes (crashes):
  1915. - Parse dates and IPv4 addresses in a locale- and libc-independent
  1916. manner, to avoid platform-dependent behavior on malformed input.
  1917. - Fix a crash that occurs on exit nodes when a nameserver request
  1918. timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
  1919. been suppressing the bug since 0.1.2.10-alpha. Partial fix for
  1920. bug 929.
  1921. - Do not assume that a stack-allocated character array will be
  1922. 64-bit aligned on platforms that demand that uint64_t access is
  1923. aligned. Possible fix for bug 604.
  1924. - Resolve a very rare crash bug that could occur when the user forced
  1925. a nameserver reconfiguration during the middle of a nameserver
  1926. probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
  1927. - Avoid a "0 divided by 0" calculation when calculating router uptime
  1928. at directory authorities. Bugfix on 0.2.0.8-alpha.
  1929. - Fix an assertion bug in parsing policy-related options; possible fix
  1930. for bug 811.
  1931. - Rate-limit too-many-sockets messages: when they happen, they happen
  1932. a lot and end up filling up the disk. Resolves bug 748.
  1933. - Fix a race condition that could cause crashes or memory corruption
  1934. when running as a server with a controller listening for log
  1935. messages.
  1936. - Avoid crashing when we have a policy specified in a DirPolicy or
  1937. SocksPolicy or ReachableAddresses option with ports set on it,
  1938. and we re-load the policy. May fix bug 996.
  1939. - Fix an assertion failure on 64-bit platforms when we allocated
  1940. memory right up to the end of a memarea, then realigned the memory
  1941. one step beyond the end. Fixes a possible cause of bug 930.
  1942. - Protect the count of open sockets with a mutex, so we can't
  1943. corrupt it when two threads are closing or opening sockets at once.
  1944. Fix for bug 939. Bugfix on 0.2.0.1-alpha.
  1945. o Major bugfixes (clients):
  1946. - Discard router descriptors as we load them if they are more than
  1947. five days old. Otherwise if Tor is off for a long time and then
  1948. starts with cached descriptors, it will try to use the onion keys
  1949. in those obsolete descriptors when building circuits. Fixes bug 887.
  1950. - When we choose to abandon a new entry guard because we think our
  1951. older ones might be better, close any circuits pending on that
  1952. new entry guard connection. This fix should make us recover much
  1953. faster when our network is down and then comes back. Bugfix on
  1954. 0.1.2.8-beta; found by lodger.
  1955. - When Tor clients restart after 1-5 days, they discard all their
  1956. cached descriptors as too old, but they still use the cached
  1957. consensus document. This approach is good for robustness, but
  1958. bad for performance: since they don't know any bandwidths, they
  1959. end up choosing at random rather than weighting their choice by
  1960. speed. Fixed by the above feature of putting bandwidths in the
  1961. consensus.
  1962. o Major bugfixes (relays):
  1963. - Relays were falling out of the networkstatus consensus for
  1964. part of a day if they changed their local config but the
  1965. authorities discarded their new descriptor as "not sufficiently
  1966. different". Now directory authorities accept a descriptor as changed
  1967. if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
  1968. patch by Sebastian.
  1969. - Ensure that two circuits can never exist on the same connection
  1970. with the same circuit ID, even if one is marked for close. This
  1971. is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
  1972. - Directory authorities were neglecting to mark relays down in their
  1973. internal histories if the relays fall off the routerlist without
  1974. ever being found unreachable. So there were relays in the histories
  1975. that haven't been seen for eight months, and are listed as being
  1976. up for eight months. This wreaked havoc on the "median wfu" and
  1977. "median mtbf" calculations, in turn making Guard and Stable flags
  1978. wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
  1979. on 0.2.0.6-alpha.
  1980. o Major bugfixes (hidden services):
  1981. - When establishing a hidden service, introduction points that
  1982. originate from cannibalized circuits were completely ignored
  1983. and not included in rendezvous service descriptors. This might
  1984. have been another reason for delay in making a hidden service
  1985. available. Bugfix from long ago (0.0.9.x?)
  1986. o Major bugfixes (memory and resource management):
  1987. - Fixed some memory leaks -- some quite frequent, some almost
  1988. impossible to trigger -- based on results from Coverity.
  1989. - Speed up parsing and cut down on memory fragmentation by using
  1990. stack-style allocations for parsing directory objects. Previously,
  1991. this accounted for over 40% of allocations from within Tor's code
  1992. on a typical directory cache.
  1993. - Use a Bloom filter rather than a digest-based set to track which
  1994. descriptors we need to keep around when we're cleaning out old
  1995. router descriptors. This speeds up the computation significantly,
  1996. and may reduce fragmentation.
  1997. o New/changed config options:
  1998. - Now NodeFamily and MyFamily config options allow spaces in
  1999. identity fingerprints, so it's easier to paste them in.
  2000. Suggested by Lucky Green.
  2001. - Allow ports 465 and 587 in the default exit policy again. We had
  2002. rejected them in 0.1.0.15, because back in 2005 they were commonly
  2003. misconfigured and ended up as spam targets. We hear they are better
  2004. locked down these days.
  2005. - Make TrackHostExit mappings expire a while after their last use, not
  2006. after their creation. Patch from Robert Hogan.
  2007. - Add an ExcludeExitNodes option so users can list a set of nodes
  2008. that should be be excluded from the exit node position, but
  2009. allowed elsewhere. Implements proposal 151.
  2010. - New --hush command-line option similar to --quiet. While --quiet
  2011. disables all logging to the console on startup, --hush limits the
  2012. output to messages of warning and error severity.
  2013. - New configure/torrc options (--enable-geoip-stats,
  2014. DirRecordUsageByCountry) to record how many IPs we've served
  2015. directory info to in each country code, how many status documents
  2016. total we've sent to each country code, and what share of the total
  2017. directory requests we should expect to see.
  2018. - Make outbound DNS packets respect the OutboundBindAddress setting.
  2019. Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
  2020. - Allow separate log levels to be configured for different logging
  2021. domains. For example, this allows one to log all notices, warnings,
  2022. or errors, plus all memory management messages of level debug or
  2023. higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
  2024. - Update to the "June 3 2009" ip-to-country file.
  2025. o Minor features (relays):
  2026. - Raise the minimum rate limiting to be a relay from 20000 bytes
  2027. to 20480 bytes (aka 20KB/s), to match our documentation. Also
  2028. update directory authorities so they always assign the Fast flag
  2029. to relays with 20KB/s of capacity. Now people running relays won't
  2030. suddenly find themselves not seeing any use, if the network gets
  2031. faster on average.
  2032. - If we're a relay and we change our IP address, be more verbose
  2033. about the reason that made us change. Should help track down
  2034. further bugs for relays on dynamic IP addresses.
  2035. - Exit servers can now answer resolve requests for ip6.arpa addresses.
  2036. - Implement most of Proposal 152: allow specialized servers to permit
  2037. single-hop circuits, and clients to use those servers to build
  2038. single-hop circuits when using a specialized controller. Patch
  2039. from Josh Albrecht. Resolves feature request 768.
  2040. - When relays do their initial bandwidth measurement, don't limit
  2041. to just our entry guards for the test circuits. Otherwise we tend
  2042. to have multiple test circuits going through a single entry guard,
  2043. which makes our bandwidth test less accurate. Fixes part of bug 654;
  2044. patch contributed by Josh Albrecht.
  2045. o Minor features (directory authorities):
  2046. - Try not to open more than one descriptor-downloading connection
  2047. to an authority at once. This should reduce load on directory
  2048. authorities. Fixes bug 366.
  2049. - Add cross-certification to newly generated certificates, so that
  2050. a signing key is enough information to look up a certificate. Start
  2051. serving certificates by <identity digest, signing key digest>
  2052. pairs. Implements proposal 157.
  2053. - When a directory authority downloads a descriptor that it then
  2054. immediately rejects, do not retry downloading it right away. Should
  2055. save some bandwidth on authorities. Fix for bug 888. Patch by
  2056. Sebastian Hahn.
  2057. - Directory authorities now serve a /tor/dbg-stability.txt URL to
  2058. help debug WFU and MTBF calculations.
  2059. - In directory authorities' approved-routers files, allow
  2060. fingerprints with or without space.
  2061. o Minor features (directory mirrors):
  2062. - When a download gets us zero good descriptors, do not notify
  2063. Tor that new directory information has arrived.
  2064. - Servers support a new URL scheme for consensus downloads that
  2065. allows the client to specify which authorities are trusted.
  2066. The server then only sends the consensus if the client will trust
  2067. it. Otherwise a 404 error is sent back. Clients use this
  2068. new scheme when the server supports it (meaning it's running
  2069. 0.2.1.1-alpha or later). Implements proposal 134.
  2070. o Minor features (bridges):
  2071. - If the bridge config line doesn't specify a port, assume 443.
  2072. This makes bridge lines a bit smaller and easier for users to
  2073. understand.
  2074. - If we're using bridges and our network goes away, be more willing
  2075. to forgive our bridges and try again when we get an application
  2076. request.
  2077. o Minor features (hidden services):
  2078. - When the client launches an introduction circuit, retry with a
  2079. new circuit after 30 seconds rather than 60 seconds.
  2080. - Launch a second client-side introduction circuit in parallel
  2081. after a delay of 15 seconds (based on work by Christian Wilms).
  2082. - Hidden services start out building five intro circuits rather
  2083. than three, and when the first three finish they publish a service
  2084. descriptor using those. Now we publish our service descriptor much
  2085. faster after restart.
  2086. - Drop the requirement to have an open dir port for storing and
  2087. serving v2 hidden service descriptors.
  2088. o Minor features (build and packaging):
  2089. - On Linux, use the prctl call to re-enable core dumps when the User
  2090. option is set.
  2091. - Try to make sure that the version of Libevent we're running with
  2092. is binary-compatible with the one we built with. May address bug
  2093. 897 and others.
  2094. - Add a new --enable-local-appdata configuration switch to change
  2095. the default location of the datadir on win32 from APPDATA to
  2096. LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
  2097. entirely. Patch from coderman.
  2098. - Build correctly against versions of OpenSSL 0.9.8 or later that
  2099. are built without support for deprecated functions.
  2100. - On platforms with a maximum syslog string length, truncate syslog
  2101. messages to that length ourselves, rather than relying on the
  2102. system to do it for us.
  2103. - Automatically detect MacOSX versions earlier than 10.4.0, and
  2104. disable kqueue from inside Tor when running with these versions.
  2105. We previously did this from the startup script, but that was no
  2106. help to people who didn't use the startup script. Resolves bug 863.
  2107. - Build correctly when configured to build outside the main source
  2108. path. Patch from Michael Gold.
  2109. - Disable GCC's strict alias optimization by default, to avoid the
  2110. likelihood of its introducing subtle bugs whenever our code violates
  2111. the letter of C99's alias rules.
  2112. - Change the contrib/tor.logrotate script so it makes the new
  2113. logs as "_tor:_tor" rather than the default, which is generally
  2114. "root:wheel". Fixes bug 676, reported by Serge Koksharov.
  2115. - Change our header file guard macros to be less likely to conflict
  2116. with system headers. Adam Langley noticed that we were conflicting
  2117. with log.h on Android.
  2118. - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
  2119. and stop using a warning that had become unfixably verbose under
  2120. GCC 4.3.
  2121. - Use a lockfile to make sure that two Tor processes are not
  2122. simultaneously running with the same datadir.
  2123. - Allow OpenSSL to use dynamic locks if it wants.
  2124. - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
  2125. o Minor features (controllers):
  2126. - When generating circuit events with verbose nicknames for
  2127. controllers, try harder to look up nicknames for routers on a
  2128. circuit. (Previously, we would look in the router descriptors we had
  2129. for nicknames, but not in the consensus.) Partial fix for bug 941.
  2130. - New controller event NEWCONSENSUS that lists the networkstatus
  2131. lines for every recommended relay. Now controllers like Torflow
  2132. can keep up-to-date on which relays they should be using.
  2133. - New controller event "clients_seen" to report a geoip-based summary
  2134. of which countries we've seen clients from recently. Now controllers
  2135. like Vidalia can show bridge operators that they're actually making
  2136. a difference.
  2137. - Add a 'getinfo status/clients-seen' controller command, in case
  2138. controllers want to hear clients_seen events but connect late.
  2139. - New CONSENSUS_ARRIVED event to note when a new consensus has
  2140. been fetched and validated.
  2141. - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
  2142. controllers to prevent SIGHUP from reloading the configuration.
  2143. Fixes bug 856.
  2144. - Return circuit purposes in response to GETINFO circuit-status.
  2145. Fixes bug 858.
  2146. - Serve the latest v3 networkstatus consensus via the control
  2147. port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
  2148. - Add a "GETINFO /status/bootstrap-phase" controller option, so the
  2149. controller can query our current bootstrap state in case it attaches
  2150. partway through and wants to catch up.
  2151. - Provide circuit purposes along with circuit events to the controller.
  2152. o Minor features (tools):
  2153. - Do not have tor-resolve automatically refuse all .onion addresses;
  2154. if AutomapHostsOnResolve is set in your torrc, this will work fine.
  2155. - Add a -p option to tor-resolve for specifying the SOCKS port: some
  2156. people find host:port too confusing.
  2157. - Print the SOCKS5 error message string as well as the error code
  2158. when a tor-resolve request fails. Patch from Jacob.
  2159. o Minor bugfixes (memory and resource management):
  2160. - Clients no longer cache certificates for authorities they do not
  2161. recognize. Bugfix on 0.2.0.9-alpha.
  2162. - Do not use C's stdio library for writing to log files. This will
  2163. improve logging performance by a minute amount, and will stop
  2164. leaking fds when our disk is full. Fixes bug 861.
  2165. - Stop erroneous use of O_APPEND in cases where we did not in fact
  2166. want to re-seek to the end of a file before every last write().
  2167. - Fix a small alignment and memory-wasting bug on buffer chunks.
  2168. Spotted by rovv.
  2169. - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
  2170. to avoid unused RAM in buffer chunks and memory pools.
  2171. - Reduce the default smartlist size from 32 to 16; it turns out that
  2172. most smartlists hold around 8-12 elements tops.
  2173. - Make dumpstats() log the fullness and size of openssl-internal
  2174. buffers.
  2175. - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
  2176. patch to their OpenSSL, turn it on to save memory on servers. This
  2177. patch will (with any luck) get included in a mainline distribution
  2178. before too long.
  2179. - Fix a memory leak when v3 directory authorities load their keys
  2180. and cert from disk. Bugfix on 0.2.0.1-alpha.
  2181. - Stop using malloc_usable_size() to use more area than we had
  2182. actually allocated: it was safe, but made valgrind really unhappy.
  2183. - Make the assert_circuit_ok() function work correctly on circuits that
  2184. have already been marked for close.
  2185. - Fix uninitialized size field for memory area allocation: may improve
  2186. memory performance during directory parsing.
  2187. o Minor bugfixes (clients):
  2188. - Stop reloading the router list from disk for no reason when we
  2189. run out of reachable directory mirrors. Once upon a time reloading
  2190. it would set the 'is_running' flag back to 1 for them. It hasn't
  2191. done that for a long time.
  2192. - When we had picked an exit node for a connection, but marked it as
  2193. "optional", and it turned out we had no onion key for the exit,
  2194. stop wanting that exit and try again. This situation may not
  2195. be possible now, but will probably become feasible with proposal
  2196. 158. Spotted by rovv. Fixes another case of bug 752.
  2197. - Fix a bug in address parsing that was preventing bridges or hidden
  2198. service targets from being at IPv6 addresses.
  2199. - Do not remove routers as too old if we do not have any consensus
  2200. document. Bugfix on 0.2.0.7-alpha.
  2201. - When an exit relay resolves a stream address to a local IP address,
  2202. do not just keep retrying that same exit relay over and
  2203. over. Instead, just close the stream. Addresses bug 872. Bugfix
  2204. on 0.2.0.32. Patch from rovv.
  2205. - Made Tor a little less aggressive about deleting expired
  2206. certificates. Partial fix for bug 854.
  2207. - Treat duplicate certificate fetches as failures, so that we do
  2208. not try to re-fetch an expired certificate over and over and over.
  2209. - Do not say we're fetching a certificate when we'll in fact skip it
  2210. because of a pending download.
  2211. - If we have correct permissions on $datadir, we complain to stdout
  2212. and fail to start. But dangerous permissions on
  2213. $datadir/cached-status/ would cause us to open a log and complain
  2214. there. Now complain to stdout and fail to start in both cases. Fixes
  2215. bug 820, reported by seeess.
  2216. o Minor bugfixes (bridges):
  2217. - When we made bridge authorities stop serving bridge descriptors over
  2218. unencrypted links, we also broke DirPort reachability testing for
  2219. bridges. So bridges with a non-zero DirPort were printing spurious
  2220. warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
  2221. - Don't allow a bridge to publish its router descriptor to a
  2222. non-bridge directory authority. Fixes part of bug 932.
  2223. - When we change to or from being a bridge, reset our counts of
  2224. client usage by country. Fixes bug 932.
  2225. o Minor bugfixes (relays):
  2226. - Log correct error messages for DNS-related network errors on
  2227. Windows.
  2228. - Actually return -1 in the error case for read_bandwidth_usage().
  2229. Harmless bug, since we currently don't care about the return value
  2230. anywhere. Bugfix on 0.2.0.9-alpha.
  2231. - Provide a more useful log message if bug 977 (related to buffer
  2232. freelists) ever reappears, and do not crash right away.
  2233. - We were already rejecting relay begin cells with destination port
  2234. of 0. Now also reject extend cells with destination port or address
  2235. of 0. Suggested by lark.
  2236. - When we can't transmit a DNS request due to a network error, retry
  2237. it after a while, and eventually transmit a failing response to
  2238. the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
  2239. - Solve a bug that kept hardware crypto acceleration from getting
  2240. enabled when accounting was turned on. Fixes bug 907. Bugfix on
  2241. 0.0.9pre6.
  2242. - When a canonical connection appears later in our internal list
  2243. than a noncanonical one for a given OR ID, always use the
  2244. canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
  2245. Spotted by rovv.
  2246. - Avoid some nasty corner cases in the logic for marking connections
  2247. as too old or obsolete or noncanonical for circuits. Partial
  2248. bugfix on bug 891.
  2249. - Fix another interesting corner-case of bug 891 spotted by rovv:
  2250. Previously, if two hosts had different amounts of clock drift, and
  2251. one of them created a new connection with just the wrong timing,
  2252. the other might decide to deprecate the new connection erroneously.
  2253. Bugfix on 0.1.1.13-alpha.
  2254. - If one win32 nameserver fails to get added, continue adding the
  2255. rest, and don't automatically fail.
  2256. - Fix a bug where an unreachable relay would establish enough
  2257. reachability testing circuits to do a bandwidth test -- if
  2258. we already have a connection to the middle hop of the testing
  2259. circuit, then it could establish the last hop by using the existing
  2260. connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
  2261. circuits no longer use entry guards in 0.2.1.3-alpha.
  2262. o Minor bugfixes (directory authorities):
  2263. - Limit uploaded directory documents to be 16M rather than 500K.
  2264. The directory authorities were refusing v3 consensus votes from
  2265. other authorities, since the votes are now 504K. Fixes bug 959;
  2266. bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
  2267. - Directory authorities should never send a 503 "busy" response to
  2268. requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
  2269. bug 959.
  2270. - Fix code so authorities _actually_ send back X-Descriptor-Not-New
  2271. headers. Bugfix on 0.2.0.10-alpha.
  2272. o Minor bugfixes (hidden services):
  2273. - When we can't find an intro key for a v2 hidden service descriptor,
  2274. fall back to the v0 hidden service descriptor and log a bug message.
  2275. Workaround for bug 1024.
  2276. - In very rare situations new hidden service descriptors were
  2277. published earlier than 30 seconds after the last change to the
  2278. service. (We currently think that a hidden service descriptor
  2279. that's been stable for 30 seconds is worth publishing.)
  2280. - If a hidden service sends us an END cell, do not consider
  2281. retrying the connection; just close it. Patch from rovv.
  2282. - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
  2283. service directories if they have no advertised dir port. Bugfix
  2284. on 0.2.0.10-alpha.
  2285. o Minor bugfixes (tools):
  2286. - In the torify(1) manpage, mention that tsocks will leak your
  2287. DNS requests.
  2288. o Minor bugfixes (controllers):
  2289. - If the controller claimed responsibility for a stream, but that
  2290. stream never finished making its connection, it would live
  2291. forever in circuit_wait state. Now we close it after SocksTimeout
  2292. seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
  2293. - Make DNS resolved controller events into "CLOSED", not
  2294. "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
  2295. bug 807.
  2296. - The control port would close the connection before flushing long
  2297. replies, such as the network consensus, if a QUIT command was issued
  2298. before the reply had completed. Now, the control port flushes all
  2299. pending replies before closing the connection. Also fix a spurious
  2300. warning when a QUIT command is issued after a malformed or rejected
  2301. AUTHENTICATE command, but before the connection was closed. Patch
  2302. by Marcus Griep. Fixes bugs 1015 and 1016.
  2303. - Fix a bug that made stream bandwidth get misreported to the
  2304. controller.
  2305. o Deprecated and removed features:
  2306. - The old "tor --version --version" command, which would print out
  2307. the subversion "Id" of most of the source files, is now removed. It
  2308. turned out to be less useful than we'd expected, and harder to
  2309. maintain.
  2310. - RedirectExits has been removed. It was deprecated since
  2311. 0.2.0.3-alpha.
  2312. - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
  2313. has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
  2314. - Cell pools are now always enabled; --disable-cell-pools is ignored.
  2315. - Directory mirrors no longer fetch the v1 directory or
  2316. running-routers files. They are obsolete, and nobody asks for them
  2317. anymore. This is the first step to making v1 authorities obsolete.
  2318. - Take out the TestVia config option, since it was a workaround for
  2319. a bug that was fixed in Tor 0.1.1.21.
  2320. - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
  2321. HiddenServiceExcludeNodes as obsolete: they never worked properly,
  2322. and nobody seems to be using them. Fixes bug 754. Bugfix on
  2323. 0.1.0.1-rc. Patch from Christian Wilms.
  2324. - Remove all backward-compatibility code for relays running
  2325. versions of Tor so old that they no longer work at all on the
  2326. Tor network.
  2327. o Code simplifications and refactoring:
  2328. - Tool-assisted documentation cleanup. Nearly every function or
  2329. static variable in Tor should have its own documentation now.
  2330. - Rename the confusing or_is_obsolete field to the more appropriate
  2331. is_bad_for_new_circs, and move it to or_connection_t where it
  2332. belongs.
  2333. - Move edge-only flags from connection_t to edge_connection_t: not
  2334. only is this better coding, but on machines of plausible alignment,
  2335. it should save 4-8 bytes per connection_t. "Every little bit helps."
  2336. - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
  2337. for consistency; keep old option working for backward compatibility.
  2338. - Simplify the code for finding connections to use for a circuit.
  2339. - Revise the connection_new functions so that a more typesafe variant
  2340. exists. This will work better with Coverity, and let us find any
  2341. actual mistakes we're making here.
  2342. - Refactor unit testing logic so that dmalloc can be used sensibly
  2343. with unit tests to check for memory leaks.
  2344. - Move all hidden-service related fields from connection and circuit
  2345. structure to substructures: this way they won't eat so much memory.
  2346. - Squeeze 2-5% out of client performance (according to oprofile) by
  2347. improving the implementation of some policy-manipulation functions.
  2348. - Change the implementation of ExcludeNodes and ExcludeExitNodes to
  2349. be more efficient. Formerly it was quadratic in the number of
  2350. servers; now it should be linear. Fixes bug 509.
  2351. - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
  2352. and n_conn_id_digest fields into a separate structure that's
  2353. only needed when the circuit has not yet attached to an n_conn.
  2354. - Optimize out calls to time(NULL) that occur for every IO operation,
  2355. or for every cell. On systems like Windows where time() is a
  2356. slow syscall, this fix will be slightly helpful.
  2357. Changes in version 0.2.0.35 - 2009-06-24
  2358. o Security fix:
  2359. - Avoid crashing in the presence of certain malformed descriptors.
  2360. Found by lark, and by automated fuzzing.
  2361. - Fix an edge case where a malicious exit relay could convince a
  2362. controller that the client's DNS question resolves to an internal IP
  2363. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  2364. o Major bugfixes:
  2365. - Finally fix the bug where dynamic-IP relays disappear when their
  2366. IP address changes: directory mirrors were mistakenly telling
  2367. them their old address if they asked via begin_dir, so they
  2368. never got an accurate answer about their new address, so they
  2369. just vanished after a day. For belt-and-suspenders, relays that
  2370. don't set Address in their config now avoid using begin_dir for
  2371. all direct connections. Should fix bugs 827, 883, and 900.
  2372. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  2373. that would occur on some exit nodes when DNS failures and timeouts
  2374. occurred in certain patterns. Fix for bug 957.
  2375. o Minor bugfixes:
  2376. - When starting with a cache over a few days old, do not leak
  2377. memory for the obsolete router descriptors in it. Bugfix on
  2378. 0.2.0.33; fixes bug 672.
  2379. - Hidden service clients didn't use a cached service descriptor that
  2380. was older than 15 minutes, but wouldn't fetch a new one either,
  2381. because there was already one in the cache. Now, fetch a v2
  2382. descriptor unless the same descriptor was added to the cache within
  2383. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  2384. Changes in version 0.2.0.34 - 2009-02-08
  2385. Tor 0.2.0.34 features several more security-related fixes. You should
  2386. upgrade, especially if you run an exit relay (remote crash) or a
  2387. directory authority (remote infinite loop), or you're on an older
  2388. (pre-XP) or not-recently-patched Windows (remote exploit).
  2389. This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  2390. have many known flaws, and nobody should be using them. You should
  2391. upgrade. If you're using a Linux or BSD and its packages are obsolete,
  2392. stop using those packages and upgrade anyway.
  2393. o Security fixes:
  2394. - Fix an infinite-loop bug on handling corrupt votes under certain
  2395. circumstances. Bugfix on 0.2.0.8-alpha.
  2396. - Fix a temporary DoS vulnerability that could be performed by
  2397. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  2398. - Avoid a potential crash on exit nodes when processing malformed
  2399. input. Remote DoS opportunity. Bugfix on 0.2.0.33.
  2400. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  2401. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  2402. o Minor bugfixes:
  2403. - Fix compilation on systems where time_t is a 64-bit integer.
  2404. Patch from Matthias Drochner.
  2405. - Don't consider expiring already-closed client connections. Fixes
  2406. bug 893. Bugfix on 0.0.2pre20.
  2407. Changes in version 0.2.0.33 - 2009-01-21
  2408. Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  2409. useful to users. It also finally fixes a bug where a relay or client
  2410. that's been off for many days would take a long time to bootstrap.
  2411. This update also fixes an important security-related bug reported by
  2412. Ilja van Sprundel. You should upgrade. (We'll send out more details
  2413. about the bug once people have had some time to upgrade.)
  2414. o Security fixes:
  2415. - Fix a heap-corruption bug that may be remotely triggerable on
  2416. some platforms. Reported by Ilja van Sprundel.
  2417. o Major bugfixes:
  2418. - When a stream at an exit relay is in state "resolving" or
  2419. "connecting" and it receives an "end" relay cell, the exit relay
  2420. would silently ignore the end cell and not close the stream. If
  2421. the client never closes the circuit, then the exit relay never
  2422. closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
  2423. reported by "wood".
  2424. - When sending CREATED cells back for a given circuit, use a 64-bit
  2425. connection ID to find the right connection, rather than an addr:port
  2426. combination. Now that we can have multiple OR connections between
  2427. the same ORs, it is no longer possible to use addr:port to uniquely
  2428. identify a connection.
  2429. - Bridge relays that had DirPort set to 0 would stop fetching
  2430. descriptors shortly after startup, and then briefly resume
  2431. after a new bandwidth test and/or after publishing a new bridge
  2432. descriptor. Bridge users that try to bootstrap from them would
  2433. get a recent networkstatus but would get descriptors from up to
  2434. 18 hours earlier, meaning most of the descriptors were obsolete
  2435. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  2436. - Prevent bridge relays from serving their 'extrainfo' document
  2437. to anybody who asks, now that extrainfo docs include potentially
  2438. sensitive aggregated client geoip summaries. Bugfix on
  2439. 0.2.0.13-alpha.
  2440. - If the cached networkstatus consensus is more than five days old,
  2441. discard it rather than trying to use it. In theory it could be
  2442. useful because it lists alternate directory mirrors, but in practice
  2443. it just means we spend many minutes trying directory mirrors that
  2444. are long gone from the network. Also discard router descriptors as
  2445. we load them if they are more than five days old, since the onion
  2446. key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
  2447. o Minor bugfixes:
  2448. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  2449. could make gcc generate non-functional binary search code. Bugfix
  2450. on 0.2.0.10-alpha.
  2451. - Build correctly on platforms without socklen_t.
  2452. - Compile without warnings on solaris.
  2453. - Avoid potential crash on internal error during signature collection.
  2454. Fixes bug 864. Patch from rovv.
  2455. - Correct handling of possible malformed authority signing key
  2456. certificates with internal signature types. Fixes bug 880.
  2457. Bugfix on 0.2.0.3-alpha.
  2458. - Fix a hard-to-trigger resource leak when logging credential status.
  2459. CID 349.
  2460. - When we can't initialize DNS because the network is down, do not
  2461. automatically stop Tor from starting. Instead, we retry failed
  2462. dns_init() every 10 minutes, and change the exit policy to reject
  2463. *:* until one succeeds. Fixes bug 691.
  2464. - Use 64 bits instead of 32 bits for connection identifiers used with
  2465. the controller protocol, to greatly reduce risk of identifier reuse.
  2466. - When we're choosing an exit node for a circuit, and we have
  2467. no pending streams, choose a good general exit rather than one that
  2468. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  2469. - Fix another case of assuming, when a specific exit is requested,
  2470. that we know more than the user about what hosts it allows.
  2471. Fixes one case of bug 752. Patch from rovv.
  2472. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  2473. seconds. Warn the user if lower values are given in the
  2474. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  2475. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  2476. user if lower values are given in the configuration. Bugfix on
  2477. 0.1.1.17-rc. Patch by Sebastian.
  2478. - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
  2479. the cache because we already had a v0 descriptor with the same ID.
  2480. Bugfix on 0.2.0.18-alpha.
  2481. - Fix a race condition when freeing keys shared between main thread
  2482. and CPU workers that could result in a memory leak. Bugfix on
  2483. 0.1.0.1-rc. Fixes bug 889.
  2484. - Send a valid END cell back when a client tries to connect to a
  2485. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  2486. 840. Patch from rovv.
  2487. - Check which hops rendezvous stream cells are associated with to
  2488. prevent possible guess-the-streamid injection attacks from
  2489. intermediate hops. Fixes another case of bug 446. Based on patch
  2490. from rovv.
  2491. - If a broken client asks a non-exit router to connect somewhere,
  2492. do not even do the DNS lookup before rejecting the connection.
  2493. Fixes another case of bug 619. Patch from rovv.
  2494. - When a relay gets a create cell it can't decrypt (e.g. because it's
  2495. using the wrong onion key), we were dropping it and letting the
  2496. client time out. Now actually answer with a destroy cell. Fixes
  2497. bug 904. Bugfix on 0.0.2pre8.
  2498. o Minor bugfixes (hidden services):
  2499. - Do not throw away existing introduction points on SIGHUP. Bugfix on
  2500. 0.0.6pre1. Patch by Karsten. Fixes bug 874.
  2501. o Minor features:
  2502. - Report the case where all signatures in a detached set are rejected
  2503. differently than the case where there is an error handling the
  2504. detached set.
  2505. - When we realize that another process has modified our cached
  2506. descriptors, print out a more useful error message rather than
  2507. triggering an assertion. Fixes bug 885. Patch from Karsten.
  2508. - Implement the 0x20 hack to better resist DNS poisoning: set the
  2509. case on outgoing DNS requests randomly, and reject responses that do
  2510. not match the case correctly. This logic can be disabled with the
  2511. ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
  2512. of servers that do not reliably preserve case in replies. See
  2513. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  2514. for more info.
  2515. - Check DNS replies for more matching fields to better resist DNS
  2516. poisoning.
  2517. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  2518. compress cells, which are basically all encrypted, compressed, or
  2519. both.
  2520. Changes in version 0.2.0.32 - 2008-11-20
  2521. Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  2522. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  2523. a smaller security flaw that might allow an attacker to access local
  2524. services, further improves hidden service performance, and fixes a
  2525. variety of other issues.
  2526. o Security fixes:
  2527. - The "User" and "Group" config options did not clear the
  2528. supplementary group entries for the Tor process. The "User" option
  2529. is now more robust, and we now set the groups to the specified
  2530. user's primary group. The "Group" option is now ignored. For more
  2531. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  2532. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  2533. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
  2534. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  2535. consistently obeyed: if an exit relay refuses a stream because its
  2536. exit policy doesn't allow it, we would remember what IP address
  2537. the relay said the destination address resolves to, even if it's
  2538. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  2539. o Major bugfixes:
  2540. - Fix a DOS opportunity during the voting signature collection process
  2541. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  2542. o Major bugfixes (hidden services):
  2543. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  2544. we were failing the whole hidden service request when the v0
  2545. descriptor fetch fails, even if the v2 fetch is still pending and
  2546. might succeed. Similarly, if the last v2 fetch fails, we were
  2547. failing the whole hidden service request even if a v0 fetch is
  2548. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  2549. - When extending a circuit to a hidden service directory to upload a
  2550. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  2551. requests failed, because the router descriptor has not been
  2552. downloaded yet. In these cases, do not attempt to upload the
  2553. rendezvous descriptor, but wait until the router descriptor is
  2554. downloaded and retry. Likewise, do not attempt to fetch a rendezvous
  2555. descriptor from a hidden service directory for which the router
  2556. descriptor has not yet been downloaded. Fixes bug 767. Bugfix
  2557. on 0.2.0.10-alpha.
  2558. o Minor bugfixes:
  2559. - Fix several infrequent memory leaks spotted by Coverity.
  2560. - When testing for libevent functions, set the LDFLAGS variable
  2561. correctly. Found by Riastradh.
  2562. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  2563. bootstrapping with tunneled directory connections. Bugfix on
  2564. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  2565. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  2566. and we know that server B rejects most-but-not all connections to
  2567. port 80, we would previously reject the connection. Now, we assume
  2568. the user knows what they were asking for. Fixes bug 752. Bugfix
  2569. on 0.0.9rc5. Diagnosed by BarkerJr.
  2570. - If we overrun our per-second write limits a little, count this as
  2571. having used up our write allocation for the second, and choke
  2572. outgoing directory writes. Previously, we had only counted this when
  2573. we had met our limits precisely. Fixes bug 824. Patch from by rovv.
  2574. Bugfix on 0.2.0.x (??).
  2575. - Remove the old v2 directory authority 'lefkada' from the default
  2576. list. It has been gone for many months.
  2577. - Stop doing unaligned memory access that generated bus errors on
  2578. sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
  2579. - Make USR2 log-level switch take effect immediately. Bugfix on
  2580. 0.1.2.8-beta.
  2581. o Minor bugfixes (controller):
  2582. - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
  2583. 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
  2584. Changes in version 0.2.0.31 - 2008-09-03
  2585. Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  2586. a big bug we're seeing where in rare cases traffic from one Tor stream
  2587. gets mixed into another stream, and fixes a variety of smaller issues.
  2588. o Major bugfixes:
  2589. - Make sure that two circuits can never exist on the same connection
  2590. with the same circuit ID, even if one is marked for close. This
  2591. is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
  2592. - Relays now reject risky extend cells: if the extend cell includes
  2593. a digest of all zeroes, or asks to extend back to the relay that
  2594. sent the extend cell, tear down the circuit. Ideas suggested
  2595. by rovv.
  2596. - If not enough of our entry guards are available so we add a new
  2597. one, we might use the new one even if it overlapped with the
  2598. current circuit's exit relay (or its family). Anonymity bugfix
  2599. pointed out by rovv.
  2600. o Minor bugfixes:
  2601. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  2602. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  2603. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  2604. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  2605. - Pick size of default geoip filename string correctly on windows.
  2606. Fixes bug 806. Bugfix on 0.2.0.30.
  2607. - Make the autoconf script accept the obsolete --with-ssl-dir
  2608. option as an alias for the actually-working --with-openssl-dir
  2609. option. Fix the help documentation to recommend --with-openssl-dir.
  2610. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  2611. - When using the TransPort option on OpenBSD, and using the User
  2612. option to change UID and drop privileges, make sure to open
  2613. /dev/pf before dropping privileges. Fixes bug 782. Patch from
  2614. Christopher Davis. Bugfix on 0.1.2.1-alpha.
  2615. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  2616. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  2617. on the client side when connecting to a hidden service. Bugfix
  2618. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  2619. - When closing an application-side connection because its circuit is
  2620. getting torn down, generate the stream event correctly. Bugfix on
  2621. 0.1.2.x. Anonymous patch.
  2622. Changes in version 0.2.0.30 - 2008-07-15
  2623. This new stable release switches to a more efficient directory
  2624. distribution design, adds features to make connections to the Tor
  2625. network harder to block, allows Tor to act as a DNS proxy, adds separate
  2626. rate limiting for relayed traffic to make it easier for clients to
  2627. become relays, fixes a variety of potential anonymity problems, and
  2628. includes the usual huge pile of other features and bug fixes.
  2629. o New v3 directory design:
  2630. - Tor now uses a new way to learn about and distribute information
  2631. about the network: the directory authorities vote on a common
  2632. network status document rather than each publishing their own
  2633. opinion. Now clients and caches download only one networkstatus
  2634. document to bootstrap, rather than downloading one for each
  2635. authority. Clients only download router descriptors listed in
  2636. the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
  2637. for details.
  2638. - Set up moria1, tor26, and dizum as v3 directory authorities
  2639. in addition to being v2 authorities. Also add three new ones:
  2640. ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
  2641. dannenberg (run by CCC).
  2642. - Switch to multi-level keys for directory authorities: now their
  2643. long-term identity key can be kept offline, and they periodically
  2644. generate a new signing key. Clients fetch the "key certificates"
  2645. to keep up to date on the right keys. Add a standalone tool
  2646. "tor-gencert" to generate key certificates. Implements proposal 103.
  2647. - Add a new V3AuthUseLegacyKey config option to make it easier for
  2648. v3 authorities to change their identity keys if another bug like
  2649. Debian's OpenSSL RNG flaw appears.
  2650. - Authorities and caches fetch the v2 networkstatus documents
  2651. less often, now that v3 is recommended.
  2652. o Make Tor connections stand out less on the wire:
  2653. - Use an improved TLS handshake designed by Steven Murdoch in proposal
  2654. 124, as revised in proposal 130. The new handshake is meant to
  2655. be harder for censors to fingerprint, and it adds the ability
  2656. to detect certain kinds of man-in-the-middle traffic analysis
  2657. attacks. The new handshake format includes version negotiation for
  2658. OR connections as described in proposal 105, which will allow us
  2659. to improve Tor's link protocol more safely in the future.
  2660. - Enable encrypted directory connections by default for non-relays,
  2661. so censor tools that block Tor directory connections based on their
  2662. plaintext patterns will no longer work. This means Tor works in
  2663. certain censored countries by default again.
  2664. - Stop including recognizeable strings in the commonname part of
  2665. Tor's x509 certificates.
  2666. o Implement bridge relays:
  2667. - Bridge relays (or "bridges" for short) are Tor relays that aren't
  2668. listed in the main Tor directory. Since there is no complete public
  2669. list of them, even an ISP that is filtering connections to all the
  2670. known Tor relays probably won't be able to block all the bridges.
  2671. See doc/design-paper/blocking.pdf and proposal 125 for details.
  2672. - New config option BridgeRelay that specifies you want to be a
  2673. bridge relay rather than a normal relay. When BridgeRelay is set
  2674. to 1, then a) you cache dir info even if your DirPort ins't on,
  2675. and b) the default for PublishServerDescriptor is now "bridge"
  2676. rather than "v2,v3".
  2677. - New config option "UseBridges 1" for clients that want to use bridge
  2678. relays instead of ordinary entry guards. Clients then specify
  2679. bridge relays by adding "Bridge" lines to their config file. Users
  2680. can learn about a bridge relay either manually through word of
  2681. mouth, or by one of our rate-limited mechanisms for giving out
  2682. bridge addresses without letting an attacker easily enumerate them
  2683. all. See https://www.torproject.org/bridges for details.
  2684. - Bridge relays behave like clients with respect to time intervals
  2685. for downloading new v3 consensus documents -- otherwise they
  2686. stand out. Bridge users now wait until the end of the interval,
  2687. so their bridge relay will be sure to have a new consensus document.
  2688. o Implement bridge directory authorities:
  2689. - Bridge authorities are like normal directory authorities, except
  2690. they don't serve a list of known bridges. Therefore users that know
  2691. a bridge's fingerprint can fetch a relay descriptor for that bridge,
  2692. including fetching updates e.g. if the bridge changes IP address,
  2693. yet an attacker can't just fetch a list of all the bridges.
  2694. - Set up Tonga as the default bridge directory authority.
  2695. - Bridge authorities refuse to serve bridge descriptors or other
  2696. bridge information over unencrypted connections (that is, when
  2697. responding to direct DirPort requests rather than begin_dir cells.)
  2698. - Bridge directory authorities do reachability testing on the
  2699. bridges they know. They provide router status summaries to the
  2700. controller via "getinfo ns/purpose/bridge", and also dump summaries
  2701. to a file periodically, so we can keep internal stats about which
  2702. bridges are functioning.
  2703. - If bridge users set the UpdateBridgesFromAuthority config option,
  2704. but the digest they ask for is a 404 on the bridge authority,
  2705. they fall back to contacting the bridge directly.
  2706. - Bridges always use begin_dir to publish their server descriptor to
  2707. the bridge authority using an anonymous encrypted tunnel.
  2708. - Early work on a "bridge community" design: if bridge authorities set
  2709. the BridgePassword config option, they will serve a snapshot of
  2710. known bridge routerstatuses from their DirPort to anybody who
  2711. knows that password. Unset by default.
  2712. - Tor now includes an IP-to-country GeoIP file, so bridge relays can
  2713. report sanitized aggregated summaries in their extra-info documents
  2714. privately to the bridge authority, listing which countries are
  2715. able to reach them. We hope this mechanism will let us learn when
  2716. certain countries start trying to block bridges.
  2717. - Bridge authorities write bridge descriptors to disk, so they can
  2718. reload them after a reboot. They can also export the descriptors
  2719. to other programs, so we can distribute them to blocked users via
  2720. the BridgeDB interface, e.g. via https://bridges.torproject.org/
  2721. and bridges@torproject.org.
  2722. o Tor can be a DNS proxy:
  2723. - The new client-side DNS proxy feature replaces the need for
  2724. dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
  2725. for DNS requests on port 9999, use the Tor network to resolve them
  2726. anonymously, and send the reply back like a regular DNS server.
  2727. The code still only implements a subset of DNS.
  2728. - Add a new AutomapHostsOnResolve option: when it is enabled, any
  2729. resolve request for hosts matching a given pattern causes Tor to
  2730. generate an internal virtual address mapping for that host. This
  2731. allows DNSPort to work sensibly with hidden service users. By
  2732. default, .exit and .onion addresses are remapped; the list of
  2733. patterns can be reconfigured with AutomapHostsSuffixes.
  2734. - Add an "-F" option to tor-resolve to force a resolve for a .onion
  2735. address. Thanks to the AutomapHostsOnResolve option, this is no
  2736. longer a completely silly thing to do.
  2737. o Major features (relay usability):
  2738. - New config options RelayBandwidthRate and RelayBandwidthBurst:
  2739. a separate set of token buckets for relayed traffic. Right now
  2740. relayed traffic is defined as answers to directory requests, and
  2741. OR connections that don't have any local circuits on them. See
  2742. proposal 111 for details.
  2743. - Create listener connections before we setuid to the configured
  2744. User and Group. Now non-Windows users can choose port values
  2745. under 1024, start Tor as root, and have Tor bind those ports
  2746. before it changes to another UID. (Windows users could already
  2747. pick these ports.)
  2748. - Added a new ConstrainedSockets config option to set SO_SNDBUF and
  2749. SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
  2750. on "vserver" accounts. Patch from coderman.
  2751. o Major features (directory authorities):
  2752. - Directory authorities track weighted fractional uptime and weighted
  2753. mean-time-between failures for relays. WFU is suitable for deciding
  2754. whether a node is "usually up", while MTBF is suitable for deciding
  2755. whether a node is "likely to stay up." We need both, because
  2756. "usually up" is a good requirement for guards, while "likely to
  2757. stay up" is a good requirement for long-lived connections.
  2758. - Directory authorities use a new formula for selecting which relays
  2759. to advertise as Guards: they must be in the top 7/8 in terms of
  2760. how long we have known about them, and above the median of those
  2761. nodes in terms of weighted fractional uptime.
  2762. - Directory authorities use a new formula for selecting which relays
  2763. to advertise as Stable: when we have 4 or more days of data, use
  2764. median measured MTBF rather than median declared uptime. Implements
  2765. proposal 108.
  2766. - Directory authorities accept and serve "extra info" documents for
  2767. routers. Routers now publish their bandwidth-history lines in the
  2768. extra-info docs rather than the main descriptor. This step saves
  2769. 60% (!) on compressed router descriptor downloads. Servers upload
  2770. extra-info docs to any authority that accepts them; directory
  2771. authorities now allow multiple router descriptors and/or extra
  2772. info documents to be uploaded in a single go. Authorities, and
  2773. caches that have been configured to download extra-info documents,
  2774. download them as needed. Implements proposal 104.
  2775. - Authorities now list relays who have the same nickname as
  2776. a different named relay, but list them with a new flag:
  2777. "Unnamed". Now we can make use of relays that happen to pick the
  2778. same nickname as a server that registered two years ago and then
  2779. disappeared. Implements proposal 122.
  2780. - Store routers in a file called cached-descriptors instead of in
  2781. cached-routers. Initialize cached-descriptors from cached-routers
  2782. if the old format is around. The new format allows us to store
  2783. annotations along with descriptors, to record the time we received
  2784. each descriptor, its source, and its purpose: currently one of
  2785. general, controller, or bridge.
  2786. o Major features (other):
  2787. - New config options WarnPlaintextPorts and RejectPlaintextPorts so
  2788. Tor can warn and/or refuse connections to ports commonly used with
  2789. vulnerable-plaintext protocols. Currently we warn on ports 23,
  2790. 109, 110, and 143, but we don't reject any. Based on proposal 129
  2791. by Kevin Bauer and Damon McCoy.
  2792. - Integrate Karsten Loesing's Google Summer of Code project to publish
  2793. hidden service descriptors on a set of redundant relays that are a
  2794. function of the hidden service address. Now we don't have to rely
  2795. on three central hidden service authorities for publishing and
  2796. fetching every hidden service descriptor. Implements proposal 114.
  2797. - Allow tunnelled directory connections to ask for an encrypted
  2798. "begin_dir" connection or an anonymized "uses a full Tor circuit"
  2799. connection independently. Now we can make anonymized begin_dir
  2800. connections for (e.g.) more secure hidden service posting and
  2801. fetching.
  2802. o Major bugfixes (crashes and assert failures):
  2803. - Stop imposing an arbitrary maximum on the number of file descriptors
  2804. used for busy servers. Bug reported by Olaf Selke; patch from
  2805. Sebastian Hahn.
  2806. - Avoid possible failures when generating a directory with routers
  2807. with over-long versions strings, or too many flags set.
  2808. - Fix a rare assert error when we're closing one of our threads:
  2809. use a mutex to protect the list of logs, so we never write to the
  2810. list as it's being freed. Fixes the very rare bug 575, which is
  2811. kind of the revenge of bug 222.
  2812. - Avoid segfault in the case where a badly behaved v2 versioning
  2813. directory sends a signed networkstatus with missing client-versions.
  2814. - When we hit an EOF on a log (probably because we're shutting down),
  2815. don't try to remove the log from the list: just mark it as
  2816. unusable. (Bulletproofs against bug 222.)
  2817. o Major bugfixes (code security fixes):
  2818. - Detect size overflow in zlib code. Reported by Justin Ferguson and
  2819. Dan Kaminsky.
  2820. - Rewrite directory tokenization code to never run off the end of
  2821. a string. Fixes bug 455. Patch from croup.
  2822. - Be more paranoid about overwriting sensitive memory on free(),
  2823. as a defensive programming tactic to ensure forward secrecy.
  2824. o Major bugfixes (anonymity fixes):
  2825. - Reject requests for reverse-dns lookup of names that are in
  2826. a private address space. Patch from lodger.
  2827. - Never report that we've used more bandwidth than we're willing to
  2828. relay: it leaks how much non-relay traffic we're using. Resolves
  2829. bug 516.
  2830. - As a client, do not believe any server that tells us that an
  2831. address maps to an internal address space.
  2832. - Warn about unsafe ControlPort configurations.
  2833. - Directory authorities now call routers Fast if their bandwidth is
  2834. at least 100KB/s, and consider their bandwidth adequate to be a
  2835. Guard if it is at least 250KB/s, no matter the medians. This fix
  2836. complements proposal 107.
  2837. - Directory authorities now never mark more than 2 servers per IP as
  2838. Valid and Running (or 5 on addresses shared by authorities).
  2839. Implements proposal 109, by Kevin Bauer and Damon McCoy.
  2840. - If we're a relay, avoid picking ourselves as an introduction point,
  2841. a rendezvous point, or as the final hop for internal circuits. Bug
  2842. reported by taranis and lodger.
  2843. - Exit relays that are used as a client can now reach themselves
  2844. using the .exit notation, rather than just launching an infinite
  2845. pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
  2846. - Fix a bug where, when we were choosing the 'end stream reason' to
  2847. put in our relay end cell that we send to the exit relay, Tor
  2848. clients on Windows were sometimes sending the wrong 'reason'. The
  2849. anonymity problem is that exit relays may be able to guess whether
  2850. the client is running Windows, thus helping partition the anonymity
  2851. set. Down the road we should stop sending reasons to exit relays,
  2852. or otherwise prevent future versions of this bug.
  2853. - Only update guard status (usable / not usable) once we have
  2854. enough directory information. This was causing us to discard all our
  2855. guards on startup if we hadn't been running for a few weeks. Fixes
  2856. bug 448.
  2857. - When our directory information has been expired for a while, stop
  2858. being willing to build circuits using it. Fixes bug 401.
  2859. o Major bugfixes (peace of mind for relay operators)
  2860. - Non-exit relays no longer answer "resolve" relay cells, so they
  2861. can't be induced to do arbitrary DNS requests. (Tor clients already
  2862. avoid using non-exit relays for resolve cells, but now servers
  2863. enforce this too.) Fixes bug 619. Patch from lodger.
  2864. - When we setconf ClientOnly to 1, close any current OR and Dir
  2865. listeners. Reported by mwenge.
  2866. o Major bugfixes (other):
  2867. - If we only ever used Tor for hidden service lookups or posts, we
  2868. would stop building circuits and start refusing connections after
  2869. 24 hours, since we falsely believed that Tor was dormant. Reported
  2870. by nwf.
  2871. - Add a new __HashedControlSessionPassword option for controllers
  2872. to use for one-off session password hashes that shouldn't get
  2873. saved to disk by SAVECONF --- Vidalia users were accumulating a
  2874. pile of HashedControlPassword lines in their torrc files, one for
  2875. each time they had restarted Tor and then clicked Save. Make Tor
  2876. automatically convert "HashedControlPassword" to this new option but
  2877. only when it's given on the command line. Partial fix for bug 586.
  2878. - Patch from "Andrew S. Lists" to catch when we contact a directory
  2879. mirror at IP address X and he says we look like we're coming from
  2880. IP address X. Otherwise this would screw up our address detection.
  2881. - Reject uploaded descriptors and extrainfo documents if they're
  2882. huge. Otherwise we'll cache them all over the network and it'll
  2883. clog everything up. Suggested by Aljosha Judmayer.
  2884. - When a hidden service was trying to establish an introduction point,
  2885. and Tor *did* manage to reuse one of the preemptively built
  2886. circuits, it didn't correctly remember which one it used,
  2887. so it asked for another one soon after, until there were no
  2888. more preemptive circuits, at which point it launched one from
  2889. scratch. Bugfix on 0.0.9.x.
  2890. o Rate limiting and load balancing improvements:
  2891. - When we add data to a write buffer in response to the data on that
  2892. write buffer getting low because of a flush, do not consider the
  2893. newly added data as a candidate for immediate flushing, but rather
  2894. make it wait until the next round of writing. Otherwise, we flush
  2895. and refill recursively, and a single greedy TLS connection can
  2896. eat all of our bandwidth.
  2897. - When counting the number of bytes written on a TLS connection,
  2898. look at the BIO actually used for writing to the network, not
  2899. at the BIO used (sometimes) to buffer data for the network.
  2900. Looking at different BIOs could result in write counts on the
  2901. order of ULONG_MAX. Fixes bug 614.
  2902. - If we change our MaxAdvertisedBandwidth and then reload torrc,
  2903. Tor won't realize it should publish a new relay descriptor. Fixes
  2904. bug 688, reported by mfr.
  2905. - Avoid using too little bandwidth when our clock skips a few seconds.
  2906. - Choose which bridge to use proportional to its advertised bandwidth,
  2907. rather than uniformly at random. This should speed up Tor for
  2908. bridge users. Also do this for people who set StrictEntryNodes.
  2909. o Bootstrapping faster and building circuits more intelligently:
  2910. - Fix bug 660 that was preventing us from knowing that we should
  2911. preemptively build circuits to handle expected directory requests.
  2912. - When we're checking if we have enough dir info for each relay
  2913. to begin establishing circuits, make sure that we actually have
  2914. the descriptor listed in the consensus, not just any descriptor.
  2915. - Correctly notify one-hop connections when a circuit build has
  2916. failed. Possible fix for bug 669. Found by lodger.
  2917. - Clients now hold circuitless TLS connections open for 1.5 times
  2918. MaxCircuitDirtiness (15 minutes), since it is likely that they'll
  2919. rebuild a new circuit over them within that timeframe. Previously,
  2920. they held them open only for KeepalivePeriod (5 minutes).
  2921. o Performance improvements (memory):
  2922. - Add OpenBSD malloc code from "phk" as an optional malloc
  2923. replacement on Linux: some glibc libraries do very poorly with
  2924. Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
  2925. ./configure to get the replacement malloc code.
  2926. - Switch our old ring buffer implementation for one more like that
  2927. used by free Unix kernels. The wasted space in a buffer with 1mb
  2928. of data will now be more like 8k than 1mb. The new implementation
  2929. also avoids realloc();realloc(); patterns that can contribute to
  2930. memory fragmentation.
  2931. - Change the way that Tor buffers data that it is waiting to write.
  2932. Instead of queueing data cells in an enormous ring buffer for each
  2933. client->OR or OR->OR connection, we now queue cells on a separate
  2934. queue for each circuit. This lets us use less slack memory, and
  2935. will eventually let us be smarter about prioritizing different kinds
  2936. of traffic.
  2937. - Reference-count and share copies of address policy entries; only 5%
  2938. of them were actually distinct.
  2939. - Tune parameters for cell pool allocation to minimize amount of
  2940. RAM overhead used.
  2941. - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
  2942. for every single inactive connection_t. Free items from the
  2943. 4k/16k-buffer free lists when they haven't been used for a while.
  2944. - Make memory debugging information describe more about history
  2945. of cell allocation, so we can help reduce our memory use.
  2946. - Be even more aggressive about releasing RAM from small
  2947. empty buffers. Thanks to our free-list code, this shouldn't be too
  2948. performance-intensive.
  2949. - Log malloc statistics from mallinfo() on platforms where it exists.
  2950. - Use memory pools to allocate cells with better speed and memory
  2951. efficiency, especially on platforms where malloc() is inefficient.
  2952. - Add a --with-tcmalloc option to the configure script to link
  2953. against tcmalloc (if present). Does not yet search for non-system
  2954. include paths.
  2955. o Performance improvements (socket management):
  2956. - Count the number of open sockets separately from the number of
  2957. active connection_t objects. This will let us avoid underusing
  2958. our allocated connection limit.
  2959. - We no longer use socket pairs to link an edge connection to an
  2960. anonymous directory connection or a DirPort test connection.
  2961. Instead, we track the link internally and transfer the data
  2962. in-process. This saves two sockets per "linked" connection (at the
  2963. client and at the server), and avoids the nasty Windows socketpair()
  2964. workaround.
  2965. - We were leaking a file descriptor if Tor started with a zero-length
  2966. cached-descriptors file. Patch by "freddy77".
  2967. o Performance improvements (CPU use):
  2968. - Never walk through the list of logs if we know that no log target
  2969. is interested in a given message.
  2970. - Call routerlist_remove_old_routers() much less often. This should
  2971. speed startup, especially on directory caches.
  2972. - Base64 decoding was actually showing up on our profile when parsing
  2973. the initial descriptor file; switch to an in-process all-at-once
  2974. implementation that's about 3.5x times faster than calling out to
  2975. OpenSSL.
  2976. - Use a slightly simpler string hashing algorithm (copying Python's
  2977. instead of Java's) and optimize our digest hashing algorithm to take
  2978. advantage of 64-bit platforms and to remove some possibly-costly
  2979. voodoo.
  2980. - When implementing AES counter mode, update only the portions of the
  2981. counter buffer that need to change, and don't keep separate
  2982. network-order and host-order counters on big-endian hosts (where
  2983. they are the same).
  2984. - Add an in-place version of aes_crypt() so that we can avoid doing a
  2985. needless memcpy() call on each cell payload.
  2986. - Use Critical Sections rather than Mutexes for synchronizing threads
  2987. on win32; Mutexes are heavier-weight, and designed for synchronizing
  2988. between processes.
  2989. o Performance improvements (bandwidth use):
  2990. - Don't try to launch new descriptor downloads quite so often when we
  2991. already have enough directory information to build circuits.
  2992. - Version 1 directories are no longer generated in full. Instead,
  2993. authorities generate and serve "stub" v1 directories that list
  2994. no servers. This will stop Tor versions 0.1.0.x and earlier from
  2995. working, but (for security reasons) nobody should be running those
  2996. versions anyway.
  2997. - Avoid going directly to the directory authorities even if you're a
  2998. relay, if you haven't found yourself reachable yet or if you've
  2999. decided not to advertise your dirport yet. Addresses bug 556.
  3000. - If we've gone 12 hours since our last bandwidth check, and we
  3001. estimate we have less than 50KB bandwidth capacity but we could
  3002. handle more, do another bandwidth test.
  3003. - Support "If-Modified-Since" when answering HTTP requests for
  3004. directories, running-routers documents, and v2 and v3 networkstatus
  3005. documents. (There's no need to support it for router descriptors,
  3006. since those are downloaded by descriptor digest.)
  3007. - Stop fetching directory info so aggressively if your DirPort is
  3008. on but your ORPort is off; stop fetching v2 dir info entirely.
  3009. You can override these choices with the new FetchDirInfoEarly
  3010. config option.
  3011. o Changed config option behavior (features):
  3012. - Configuration files now accept C-style strings as values. This
  3013. helps encode characters not allowed in the current configuration
  3014. file format, such as newline or #. Addresses bug 557.
  3015. - Add hidden services and DNSPorts to the list of things that make
  3016. Tor accept that it has running ports. Change starting Tor with no
  3017. ports from a fatal error to a warning; we might change it back if
  3018. this turns out to confuse anybody. Fixes bug 579.
  3019. - Make PublishServerDescriptor default to 1, so the default doesn't
  3020. have to change as we invent new directory protocol versions.
  3021. - Allow people to say PreferTunnelledDirConns rather than
  3022. PreferTunneledDirConns, for those alternate-spellers out there.
  3023. - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
  3024. accommodate the growing number of servers that use the default
  3025. and are reaching it.
  3026. - Make it possible to enable HashedControlPassword and
  3027. CookieAuthentication at the same time.
  3028. - When a TrackHostExits-chosen exit fails too many times in a row,
  3029. stop using it. Fixes bug 437.
  3030. o Changed config option behavior (bugfixes):
  3031. - Do not read the configuration file when we've only been told to
  3032. generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
  3033. based on patch from Sebastian Hahn.
  3034. - Actually validate the options passed to AuthDirReject,
  3035. AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
  3036. - Make "ClientOnly 1" config option disable directory ports too.
  3037. - Don't stop fetching descriptors when FetchUselessDescriptors is
  3038. set, even if we stop asking for circuits. Bug reported by tup
  3039. and ioerror.
  3040. - Servers used to decline to publish their DirPort if their
  3041. BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
  3042. they look only at BandwidthRate and RelayBandwidthRate.
  3043. - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
  3044. minus 1 byte: the actual maximum declared bandwidth.
  3045. - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
  3046. - Make the NodeFamilies config option work. (Reported by
  3047. lodger -- it has never actually worked, even though we added it
  3048. in Oct 2004.)
  3049. - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
  3050. now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
  3051. o New config options:
  3052. - New configuration options AuthDirMaxServersPerAddr and
  3053. AuthDirMaxServersperAuthAddr to override default maximum number
  3054. of servers allowed on a single IP address. This is important for
  3055. running a test network on a single host.
  3056. - Three new config options (AlternateDirAuthority,
  3057. AlternateBridgeAuthority, and AlternateHSAuthority) that let the
  3058. user selectively replace the default directory authorities by type,
  3059. rather than the all-or-nothing replacement that DirServer offers.
  3060. - New config options AuthDirBadDir and AuthDirListBadDirs for
  3061. authorities to mark certain relays as "bad directories" in the
  3062. networkstatus documents. Also supports the "!baddir" directive in
  3063. the approved-routers file.
  3064. - New config option V2AuthoritativeDirectory that all v2 directory
  3065. authorities must set. This lets v3 authorities choose not to serve
  3066. v2 directory information.
  3067. o Minor features (other):
  3068. - When we're not serving v2 directory information, there is no reason
  3069. to actually keep any around. Remove the obsolete files and directory
  3070. on startup if they are very old and we aren't going to serve them.
  3071. - When we negotiate a v2 link-layer connection (not yet implemented),
  3072. accept RELAY_EARLY cells and turn them into RELAY cells if we've
  3073. negotiated a v1 connection for their next step. Initial steps for
  3074. proposal 110.
  3075. - When we have no consensus, check FallbackNetworkstatusFile (defaults
  3076. to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
  3077. we can start out knowing some directory caches. We don't ship with
  3078. a fallback consensus by default though, because it was making
  3079. bootstrapping take too long while we tried many down relays.
  3080. - Authorities send back an X-Descriptor-Not-New header in response to
  3081. an accepted-but-discarded descriptor upload. Partially implements
  3082. fix for bug 535.
  3083. - If we find a cached-routers file that's been sitting around for more
  3084. than 28 days unmodified, then most likely it's a leftover from
  3085. when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
  3086. routers anyway.
  3087. - When we (as a cache) download a descriptor because it was listed
  3088. in a consensus, remember when the consensus was supposed to expire,
  3089. and don't expire the descriptor until then.
  3090. - Optionally (if built with -DEXPORTMALLINFO) export the output
  3091. of mallinfo via http, as tor/mallinfo.txt. Only accessible
  3092. from localhost.
  3093. - Tag every guard node in our state file with the version that
  3094. we believe added it, or with our own version if we add it. This way,
  3095. if a user temporarily runs an old version of Tor and then switches
  3096. back to a new one, she doesn't automatically lose her guards.
  3097. - When somebody requests a list of statuses or servers, and we have
  3098. none of those, return a 404 rather than an empty 200.
  3099. - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
  3100. from croup.)
  3101. - Add an HSAuthorityRecordStats option that hidden service authorities
  3102. can use to track statistics of overall hidden service usage without
  3103. logging information that would be as useful to an attacker.
  3104. - Allow multiple HiddenServicePort directives with the same virtual
  3105. port; when they occur, the user is sent round-robin to one
  3106. of the target ports chosen at random. Partially fixes bug 393 by
  3107. adding limited ad-hoc round-robining.
  3108. - Revamp file-writing logic so we don't need to have the entire
  3109. contents of a file in memory at once before we write to disk. Tor,
  3110. meet stdio.
  3111. o Minor bugfixes (other):
  3112. - Alter the code that tries to recover from unhandled write
  3113. errors, to not try to flush onto a socket that's given us
  3114. unhandled errors.
  3115. - Directory mirrors no longer include a guess at the client's IP
  3116. address if the connection appears to be coming from the same /24
  3117. network; it was producing too many wrong guesses.
  3118. - If we're trying to flush the last bytes on a connection (for
  3119. example, when answering a directory request), reset the
  3120. time-to-give-up timeout every time we manage to write something
  3121. on the socket.
  3122. - Reject router descriptors with out-of-range bandwidthcapacity or
  3123. bandwidthburst values.
  3124. - If we can't expand our list of entry guards (e.g. because we're
  3125. using bridges or we have StrictEntryNodes set), don't mark relays
  3126. down when they fail a directory request. Otherwise we're too quick
  3127. to mark all our entry points down.
  3128. - Authorities no longer send back "400 you're unreachable please fix
  3129. it" errors to Tor servers that aren't online all the time. We're
  3130. supposed to tolerate these servers now.
  3131. - Let directory authorities startup even when they can't generate
  3132. a descriptor immediately, e.g. because they don't know their
  3133. address.
  3134. - Correctly enforce that elements of directory objects do not appear
  3135. more often than they are allowed to appear.
  3136. - Stop allowing hibernating servers to be "stable" or "fast".
  3137. - On Windows, we were preventing other processes from reading
  3138. cached-routers while Tor was running. (Reported by janbar)
  3139. - Check return values from pthread_mutex functions.
  3140. - When opening /dev/null in finish_daemonize(), do not pass the
  3141. O_CREAT flag. Fortify was complaining, and correctly so. Fixes
  3142. bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
  3143. o Controller features:
  3144. - The GETCONF command now escapes and quotes configuration values
  3145. that don't otherwise fit into the torrc file.
  3146. - The SETCONF command now handles quoted values correctly.
  3147. - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
  3148. ask about source, timestamp of arrival, purpose, etc. We need
  3149. something like this to help Vidalia not do GeoIP lookups on bridge
  3150. addresses.
  3151. - Allow multiple HashedControlPassword config lines, to support
  3152. multiple controller passwords.
  3153. - Accept LF instead of CRLF on controller, since some software has a
  3154. hard time generating real Internet newlines.
  3155. - Add GETINFO values for the server status events
  3156. "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
  3157. Robert Hogan.
  3158. - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
  3159. GETINFO for Torstat to use until it can switch to using extrainfos.
  3160. - New config option CookieAuthFile to choose a new location for the
  3161. cookie authentication file, and config option
  3162. CookieAuthFileGroupReadable to make it group-readable.
  3163. - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
  3164. match requests to applications. Patch from Robert Hogan.
  3165. - Add a RESOLVE command to launch hostname lookups. Original patch
  3166. from Robert Hogan.
  3167. - Add GETINFO status/enough-dir-info to let controllers tell whether
  3168. Tor has downloaded sufficient directory information. Patch from Tup.
  3169. - You can now use the ControlSocket option to tell Tor to listen for
  3170. controller connections on Unix domain sockets on systems that
  3171. support them. Patch from Peter Palfrader.
  3172. - New "GETINFO address-mappings/*" command to get address mappings
  3173. with expiry information. "addr-mappings/*" is now deprecated.
  3174. Patch from Tup.
  3175. - Add a new config option __DisablePredictedCircuits designed for
  3176. use by the controller, when we don't want Tor to build any circuits
  3177. preemptively.
  3178. - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
  3179. so we can exit from the middle of the circuit.
  3180. - Implement "getinfo status/circuit-established".
  3181. - Implement "getinfo status/version/..." so a controller can tell
  3182. whether the current version is recommended, and whether any versions
  3183. are good, and how many authorities agree. Patch from "shibz".
  3184. - Controllers should now specify cache=no or cache=yes when using
  3185. the +POSTDESCRIPTOR command.
  3186. - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
  3187. Robert Hogan. Fixes the first part of bug 681.
  3188. - When reporting clock skew, and we know that the clock is _at least
  3189. as skewed_ as some value, but we don't know the actual value,
  3190. report the value as a "minimum skew."
  3191. o Controller bugfixes:
  3192. - Generate "STATUS_SERVER" events rather than misspelled
  3193. "STATUS_SEVER" events. Caught by mwenge.
  3194. - Reject controller commands over 1MB in length, so rogue
  3195. processes can't run us out of memory.
  3196. - Change the behavior of "getinfo status/good-server-descriptor"
  3197. so it doesn't return failure when any authority disappears.
  3198. - Send NAMESERVER_STATUS messages for a single failed nameserver
  3199. correctly.
  3200. - When the DANGEROUS_VERSION controller status event told us we're
  3201. running an obsolete version, it used the string "OLD" to describe
  3202. it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
  3203. "OBSOLETE" in both cases.
  3204. - Respond to INT and TERM SIGNAL commands before we execute the
  3205. signal, in case the signal shuts us down. We had a patch in
  3206. 0.1.2.1-alpha that tried to do this by queueing the response on
  3207. the connection's buffer before shutting down, but that really
  3208. isn't the same thing at all. Bug located by Matt Edman.
  3209. - Provide DNS expiry times in GMT, not in local time. For backward
  3210. compatibility, ADDRMAP events only provide GMT expiry in an extended
  3211. field. "GETINFO address-mappings" always does the right thing.
  3212. - Use CRLF line endings properly in NS events.
  3213. - Make 'getinfo fingerprint' return a 551 error if we're not a
  3214. server, so we match what the control spec claims we do. Reported
  3215. by daejees.
  3216. - Fix a typo in an error message when extendcircuit fails that
  3217. caused us to not follow the \r\n-based delimiter protocol. Reported
  3218. by daejees.
  3219. - When tunneling an encrypted directory connection, and its first
  3220. circuit fails, do not leave it unattached and ask the controller
  3221. to deal. Fixes the second part of bug 681.
  3222. - Treat some 403 responses from directory servers as INFO rather than
  3223. WARN-severity events.
  3224. o Portability / building / compiling:
  3225. - When building with --enable-gcc-warnings, check for whether Apple's
  3226. warning "-Wshorten-64-to-32" is available.
  3227. - Support compilation to target iPhone; patch from cjacker huang.
  3228. To build for iPhone, pass the --enable-iphone option to configure.
  3229. - Port Tor to build and run correctly on Windows CE systems, using
  3230. the wcecompat library. Contributed by Valerio Lupi.
  3231. - Detect non-ASCII platforms (if any still exist) and refuse to
  3232. build there: some of our code assumes that 'A' is 65 and so on.
  3233. - Clear up some MIPSPro compiler warnings.
  3234. - Make autoconf search for libevent, openssl, and zlib consistently.
  3235. - Update deprecated macros in configure.in.
  3236. - When warning about missing headers, tell the user to let us
  3237. know if the compile succeeds anyway, so we can downgrade the
  3238. warning.
  3239. - Include the current subversion revision as part of the version
  3240. string: either fetch it directly if we're in an SVN checkout, do
  3241. some magic to guess it if we're in an SVK checkout, or use
  3242. the last-detected version if we're building from a .tar.gz.
  3243. Use this version consistently in log messages.
  3244. - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
  3245. - Read resolv.conf files correctly on platforms where read() returns
  3246. partial results on small file reads.
  3247. - Build without verbose warnings even on gcc 4.2 and 4.3.
  3248. - On Windows, correctly detect errors when listing the contents of
  3249. a directory. Fix from lodger.
  3250. - Run 'make test' as part of 'make dist', so we stop releasing so
  3251. many development snapshots that fail their unit tests.
  3252. - Add support to detect Libevent versions in the 1.4.x series
  3253. on mingw.
  3254. - Add command-line arguments to unit-test executable so that we can
  3255. invoke any chosen test from the command line rather than having
  3256. to run the whole test suite at once; and so that we can turn on
  3257. logging for the unit tests.
  3258. - Do not automatically run configure from autogen.sh. This
  3259. non-standard behavior tended to annoy people who have built other
  3260. programs.
  3261. - Fix a macro/CPP interaction that was confusing some compilers:
  3262. some GCCs don't like #if/#endif pairs inside macro arguments.
  3263. Fixes bug 707.
  3264. - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
  3265. Fixes bug 704; fix from Steven Murdoch.
  3266. - Correctly detect transparent proxy support on Linux hosts that
  3267. require in.h to be included before netfilter_ipv4.h. Patch
  3268. from coderman.
  3269. o Logging improvements:
  3270. - When we haven't had any application requests lately, don't bother
  3271. logging that we have expired a bunch of descriptors.
  3272. - When attempting to open a logfile fails, tell us why.
  3273. - Only log guard node status when guard node status has changed.
  3274. - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
  3275. make "INFO" 75% less verbose.
  3276. - When SafeLogging is disabled, log addresses along with all TLS
  3277. errors.
  3278. - Report TLS "zero return" case as a "clean close" and "IO error"
  3279. as a "close". Stop calling closes "unexpected closes": existing
  3280. Tors don't use SSL_close(), so having a connection close without
  3281. the TLS shutdown handshake is hardly unexpected.
  3282. - When we receive a consensus from the future, warn about skew.
  3283. - Make "not enough dir info yet" warnings describe *why* Tor feels
  3284. it doesn't have enough directory info yet.
  3285. - On the USR1 signal, when dmalloc is in use, log the top 10 memory
  3286. consumers. (We already do this on HUP.)
  3287. - Give more descriptive well-formedness errors for out-of-range
  3288. hidden service descriptor/protocol versions.
  3289. - Stop recommending that every server operator send mail to tor-ops.
  3290. Resolves bug 597. Bugfix on 0.1.2.x.
  3291. - Improve skew reporting: try to give the user a better log message
  3292. about how skewed they are, and how much this matters.
  3293. - New --quiet command-line option to suppress the default console log.
  3294. Good in combination with --hash-password.
  3295. - Don't complain that "your server has not managed to confirm that its
  3296. ports are reachable" if we haven't been able to build any circuits
  3297. yet.
  3298. - Detect the reason for failing to mmap a descriptor file we just
  3299. wrote, and give a more useful log message. Fixes bug 533.
  3300. - Always prepend "Bug: " to any log message about a bug.
  3301. - When dumping memory usage, list bytes used in buffer memory
  3302. free-lists.
  3303. - When running with dmalloc, dump more stats on hup and on exit.
  3304. - Put a platform string (e.g. "Linux i686") in the startup log
  3305. message, so when people paste just their logs, we know if it's
  3306. OpenBSD or Windows or what.
  3307. - When logging memory usage, break down memory used in buffers by
  3308. buffer type.
  3309. - When we are reporting the DirServer line we just parsed, we were
  3310. logging the second stanza of the key fingerprint, not the first.
  3311. - Even though Windows is equally happy with / and \ as path separators,
  3312. try to use \ consistently on Windows and / consistently on Unix: it
  3313. makes the log messages nicer.
  3314. - On OSX, stop warning the user that kqueue support in libevent is
  3315. "experimental", since it seems to have worked fine for ages.
  3316. o Contributed scripts and tools:
  3317. - Update linux-tor-prio.sh script to allow QoS based on the uid of
  3318. the Tor process. Patch from Marco Bonetti with tweaks from Mike
  3319. Perry.
  3320. - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
  3321. Unix users an easy way to script their Tor process (e.g. by
  3322. adjusting bandwidth based on the time of the day).
  3323. - In the exitlist script, only consider the most recently published
  3324. server descriptor for each server. Also, when the user requests
  3325. a list of servers that _reject_ connections to a given address,
  3326. explicitly exclude the IPs that also have servers that accept
  3327. connections to that address. Resolves bug 405.
  3328. - Include a new contrib/tor-exit-notice.html file that exit relay
  3329. operators can put on their website to help reduce abuse queries.
  3330. o Newly deprecated features:
  3331. - The status/version/num-versioning and status/version/num-concurring
  3332. GETINFO controller options are no longer useful in the v3 directory
  3333. protocol: treat them as deprecated, and warn when they're used.
  3334. - The RedirectExits config option is now deprecated.
  3335. o Removed features:
  3336. - Drop the old code to choke directory connections when the
  3337. corresponding OR connections got full: thanks to the cell queue
  3338. feature, OR conns don't get full any more.
  3339. - Remove the old "dns worker" server DNS code: it hasn't been default
  3340. since 0.1.2.2-alpha, and all the servers are using the new
  3341. eventdns code.
  3342. - Remove the code to generate the oldest (v1) directory format.
  3343. - Remove support for the old bw_accounting file: we've been storing
  3344. bandwidth accounting information in the state file since
  3345. 0.1.2.5-alpha. This may result in bandwidth accounting errors
  3346. if you try to upgrade from 0.1.1.x or earlier, or if you try to
  3347. downgrade to 0.1.1.x or earlier.
  3348. - Drop support for OpenSSL version 0.9.6. Just about nobody was using
  3349. it, it had no AES, and it hasn't seen any security patches since
  3350. 2004.
  3351. - Stop overloading the circuit_t.onionskin field for both "onionskin
  3352. from a CREATE cell that we are waiting for a cpuworker to be
  3353. assigned" and "onionskin from an EXTEND cell that we are going to
  3354. send to an OR as soon as we are connected". Might help with bug 600.
  3355. - Remove the tor_strpartition() function: its logic was confused,
  3356. and it was only used for one thing that could be implemented far
  3357. more easily.
  3358. - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
  3359. and TorControl.py, as they use the old v0 controller protocol,
  3360. and are obsoleted by TorFlow anyway.
  3361. - Drop support for v1 rendezvous descriptors, since we never used
  3362. them anyway, and the code has probably rotted by now. Based on
  3363. patch from Karsten Loesing.
  3364. - Stop allowing address masks that do not correspond to bit prefixes.
  3365. We have warned about these for a really long time; now it's time
  3366. to reject them. (Patch from croup.)
  3367. - Remove an optimization in the AES counter-mode code that assumed
  3368. that the counter never exceeded 2^68. When the counter can be set
  3369. arbitrarily as an IV (as it is by Karsten's new hidden services
  3370. code), this assumption no longer holds.
  3371. - Disable the SETROUTERPURPOSE controller command: it is now
  3372. obsolete.
  3373. Changes in version 0.1.2.19 - 2008-01-17
  3374. Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  3375. exit policy a little bit more conservative so it's safer to run an
  3376. exit relay on a home system, and fixes a variety of smaller issues.
  3377. o Security fixes:
  3378. - Exit policies now reject connections that are addressed to a
  3379. relay's public (external) IP address too, unless
  3380. ExitPolicyRejectPrivate is turned off. We do this because too
  3381. many relays are running nearby to services that trust them based
  3382. on network address.
  3383. o Major bugfixes:
  3384. - When the clock jumps forward a lot, do not allow the bandwidth
  3385. buckets to become negative. Fixes bug 544.
  3386. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  3387. on every successful resolve. Reported by Mike Perry.
  3388. - Purge old entries from the "rephist" database and the hidden
  3389. service descriptor database even when DirPort is zero.
  3390. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  3391. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  3392. crashing or mis-answering these requests.
  3393. - When we decide to send a 503 response to a request for servers, do
  3394. not then also send the server descriptors: this defeats the whole
  3395. purpose. Fixes bug 539.
  3396. o Minor bugfixes:
  3397. - Changing the ExitPolicyRejectPrivate setting should cause us to
  3398. rebuild our server descriptor.
  3399. - Fix handling of hex nicknames when answering controller requests for
  3400. networkstatus by name, or when deciding whether to warn about
  3401. unknown routers in a config option. (Patch from mwenge.)
  3402. - Fix a couple of hard-to-trigger autoconf problems that could result
  3403. in really weird results on platforms whose sys/types.h files define
  3404. nonstandard integer types.
  3405. - Don't try to create the datadir when running --verify-config or
  3406. --hash-password. Resolves bug 540.
  3407. - If we were having problems getting a particular descriptor from the
  3408. directory caches, and then we learned about a new descriptor for
  3409. that router, we weren't resetting our failure count. Reported
  3410. by lodger.
  3411. - Although we fixed bug 539 (where servers would send HTTP status 503
  3412. responses _and_ send a body too), there are still servers out there
  3413. that haven't upgraded. Therefore, make clients parse such bodies
  3414. when they receive them.
  3415. - Run correctly on systems where rlim_t is larger than unsigned long.
  3416. This includes some 64-bit systems.
  3417. - Run correctly on platforms (like some versions of OS X 10.5) where
  3418. the real limit for number of open files is OPEN_FILES, not rlim_max
  3419. from getrlimit(RLIMIT_NOFILES).
  3420. - Avoid a spurious free on base64 failure.
  3421. - Avoid segfaults on certain complex invocations of
  3422. router_get_by_hexdigest().
  3423. - Fix rare bug on REDIRECTSTREAM control command when called with no
  3424. port set: it could erroneously report an error when none had
  3425. happened.
  3426. Changes in version 0.1.2.18 - 2007-10-28
  3427. Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  3428. hidden service introduction that were causing huge delays, and a big
  3429. bug that was causing some servers to disappear from the network status
  3430. lists for a few hours each day.
  3431. o Major bugfixes (crashes):
  3432. - If a connection is shut down abruptly because of something that
  3433. happened inside connection_flushed_some(), do not call
  3434. connection_finished_flushing(). Should fix bug 451:
  3435. "connection_stop_writing: Assertion conn->write_event failed"
  3436. Bugfix on 0.1.2.7-alpha.
  3437. - Fix possible segfaults in functions called from
  3438. rend_process_relay_cell().
  3439. o Major bugfixes (hidden services):
  3440. - Hidden services were choosing introduction points uniquely by
  3441. hexdigest, but when constructing the hidden service descriptor
  3442. they merely wrote the (potentially ambiguous) nickname.
  3443. - Clients now use the v2 intro format for hidden service
  3444. connections: they specify their chosen rendezvous point by identity
  3445. digest rather than by (potentially ambiguous) nickname. These
  3446. changes could speed up hidden service connections dramatically.
  3447. o Major bugfixes (other):
  3448. - Stop publishing a new server descriptor just because we get a
  3449. HUP signal. This led (in a roundabout way) to some servers getting
  3450. dropped from the networkstatus lists for a few hours each day.
  3451. - When looking for a circuit to cannibalize, consider family as well
  3452. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  3453. circuit cannibalization).
  3454. - When a router wasn't listed in a new networkstatus, we were leaving
  3455. the flags for that router alone -- meaning it remained Named,
  3456. Running, etc -- even though absence from the networkstatus means
  3457. that it shouldn't be considered to exist at all anymore. Now we
  3458. clear all the flags for routers that fall out of the networkstatus
  3459. consensus. Fixes bug 529.
  3460. o Minor bugfixes:
  3461. - Don't try to access (or alter) the state file when running
  3462. --list-fingerprint or --verify-config or --hash-password. Resolves
  3463. bug 499.
  3464. - When generating information telling us how to extend to a given
  3465. router, do not try to include the nickname if it is
  3466. absent. Resolves bug 467.
  3467. - Fix a user-triggerable segfault in expand_filename(). (There isn't
  3468. a way to trigger this remotely.)
  3469. - When sending a status event to the controller telling it that an
  3470. OR address is reachable, set the port correctly. (Previously we
  3471. were reporting the dir port.)
  3472. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  3473. command. Bugfix on 0.1.2.17.
  3474. - When loading bandwidth history, do not believe any information in
  3475. the future. Fixes bug 434.
  3476. - When loading entry guard information, do not believe any information
  3477. in the future.
  3478. - When we have our clock set far in the future and generate an
  3479. onion key, then re-set our clock to be correct, we should not stop
  3480. the onion key from getting rotated.
  3481. - On some platforms, accept() can return a broken address. Detect
  3482. this more quietly, and deal accordingly. Fixes bug 483.
  3483. - It's not actually an error to find a non-pending entry in the DNS
  3484. cache when canceling a pending resolve. Don't log unless stuff
  3485. is fishy. Resolves bug 463.
  3486. - Don't reset trusted dir server list when we set a configuration
  3487. option. Patch from Robert Hogan.
  3488. Changes in version 0.1.2.17 - 2007-08-30
  3489. Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  3490. X bundles. Vidalia 0.0.14 makes authentication required for the
  3491. ControlPort in the default configuration, which addresses important
  3492. security risks. Everybody who uses Vidalia (or another controller)
  3493. should upgrade.
  3494. In addition, this Tor update fixes major load balancing problems with
  3495. path selection, which should speed things up a lot once many people
  3496. have upgraded.
  3497. o Major bugfixes (security):
  3498. - We removed support for the old (v0) control protocol. It has been
  3499. deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
  3500. become more of a headache than it's worth.
  3501. o Major bugfixes (load balancing):
  3502. - When choosing nodes for non-guard positions, weight guards
  3503. proportionally less, since they already have enough load. Patch
  3504. from Mike Perry.
  3505. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  3506. will allow fast Tor servers to get more attention.
  3507. - When we're upgrading from an old Tor version, forget our current
  3508. guards and pick new ones according to the new weightings. These
  3509. three load balancing patches could raise effective network capacity
  3510. by a factor of four. Thanks to Mike Perry for measurements.
  3511. o Major bugfixes (stream expiration):
  3512. - Expire not-yet-successful application streams in all cases if
  3513. they've been around longer than SocksTimeout. Right now there are
  3514. some cases where the stream will live forever, demanding a new
  3515. circuit every 15 seconds. Fixes bug 454; reported by lodger.
  3516. o Minor features (controller):
  3517. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  3518. is valid before any authentication has been received. It tells
  3519. a controller what kind of authentication is expected, and what
  3520. protocol is spoken. Implements proposal 119.
  3521. o Minor bugfixes (performance):
  3522. - Save on most routerlist_assert_ok() calls in routerlist.c, thus
  3523. greatly speeding up loading cached-routers from disk on startup.
  3524. - Disable sentinel-based debugging for buffer code: we squashed all
  3525. the bugs that this was supposed to detect a long time ago, and now
  3526. its only effect is to change our buffer sizes from nice powers of
  3527. two (which platform mallocs tend to like) to values slightly over
  3528. powers of two (which make some platform mallocs sad).
  3529. o Minor bugfixes (misc):
  3530. - If exit bandwidth ever exceeds one third of total bandwidth, then
  3531. use the correct formula to weight exit nodes when choosing paths.
  3532. Based on patch from Mike Perry.
  3533. - Choose perfectly fairly among routers when choosing by bandwidth and
  3534. weighting by fraction of bandwidth provided by exits. Previously, we
  3535. would choose with only approximate fairness, and correct ourselves
  3536. if we ran off the end of the list.
  3537. - If we require CookieAuthentication but we fail to write the
  3538. cookie file, we would warn but not exit, and end up in a state
  3539. where no controller could authenticate. Now we exit.
  3540. - If we require CookieAuthentication, stop generating a new cookie
  3541. every time we change any piece of our config.
  3542. - Refuse to start with certain directory authority keys, and
  3543. encourage people using them to stop.
  3544. - Terminate multi-line control events properly. Original patch
  3545. from tup.
  3546. - Fix a minor memory leak when we fail to find enough suitable
  3547. servers to choose a circuit.
  3548. - Stop leaking part of the descriptor when we run into a particularly
  3549. unparseable piece of it.
  3550. Changes in version 0.1.2.16 - 2007-08-01
  3551. Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  3552. remote attacker in certain situations to rewrite the user's torrc
  3553. configuration file. This can completely compromise anonymity of users
  3554. in most configurations, including those running the Vidalia bundles,
  3555. TorK, etc. Or worse.
  3556. o Major security fixes:
  3557. - Close immediately after missing authentication on control port;
  3558. do not allow multiple authentication attempts.
  3559. Changes in version 0.1.2.15 - 2007-07-17
  3560. Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  3561. problems, fixes compilation on BSD, and fixes a variety of other
  3562. bugs. Everybody should upgrade.
  3563. o Major bugfixes (compilation):
  3564. - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
  3565. o Major bugfixes (crashes):
  3566. - Try even harder not to dereference the first character after
  3567. an mmap(). Reported by lodger.
  3568. - Fix a crash bug in directory authorities when we re-number the
  3569. routerlist while inserting a new router.
  3570. - When the cached-routers file is an even multiple of the page size,
  3571. don't run off the end and crash. (Fixes bug 455; based on idea
  3572. from croup.)
  3573. - Fix eventdns.c behavior on Solaris: It is critical to include
  3574. orconfig.h _before_ sys/types.h, so that we can get the expected
  3575. definition of _FILE_OFFSET_BITS.
  3576. o Major bugfixes (security):
  3577. - Fix a possible buffer overrun when using BSD natd support. Bug
  3578. found by croup.
  3579. - When sending destroy cells from a circuit's origin, don't include
  3580. the reason for tearing down the circuit. The spec says we didn't,
  3581. and now we actually don't. Reported by lodger.
  3582. - Keep streamids from different exits on a circuit separate. This
  3583. bug may have allowed other routers on a given circuit to inject
  3584. cells into streams. Reported by lodger; fixes bug 446.
  3585. - If there's a never-before-connected-to guard node in our list,
  3586. never choose any guards past it. This way we don't expand our
  3587. guard list unless we need to.
  3588. o Minor bugfixes (guard nodes):
  3589. - Weight guard selection by bandwidth, so that low-bandwidth nodes
  3590. don't get overused as guards.
  3591. o Minor bugfixes (directory):
  3592. - Correctly count the number of authorities that recommend each
  3593. version. Previously, we were under-counting by 1.
  3594. - Fix a potential crash bug when we load many server descriptors at
  3595. once and some of them make others of them obsolete. Fixes bug 458.
  3596. o Minor bugfixes (hidden services):
  3597. - Stop tearing down the whole circuit when the user asks for a
  3598. connection to a port that the hidden service didn't configure.
  3599. Resolves bug 444.
  3600. o Minor bugfixes (misc):
  3601. - On Windows, we were preventing other processes from reading
  3602. cached-routers while Tor was running. Reported by janbar.
  3603. - Fix a possible (but very unlikely) bug in picking routers by
  3604. bandwidth. Add a log message to confirm that it is in fact
  3605. unlikely. Patch from lodger.
  3606. - Backport a couple of memory leak fixes.
  3607. - Backport miscellaneous cosmetic bugfixes.
  3608. Changes in version 0.1.2.14 - 2007-05-25
  3609. Tor 0.1.2.14 changes the addresses of two directory authorities (this
  3610. change especially affects those who serve or use hidden services),
  3611. and fixes several other crash- and security-related bugs.
  3612. o Directory authority changes:
  3613. - Two directory authorities (moria1 and moria2) just moved to new
  3614. IP addresses. This change will particularly affect those who serve
  3615. or use hidden services.
  3616. o Major bugfixes (crashes):
  3617. - If a directory server runs out of space in the connection table
  3618. as it's processing a begin_dir request, it will free the exit stream
  3619. but leave it attached to the circuit, leading to unpredictable
  3620. behavior. (Reported by seeess, fixes bug 425.)
  3621. - Fix a bug in dirserv_remove_invalid() that would cause authorities
  3622. to corrupt memory under some really unlikely scenarios.
  3623. - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
  3624. - Avoid segfaults when reading from mmaped descriptor file. (Reported
  3625. by lodger.)
  3626. o Major bugfixes (security):
  3627. - When choosing an entry guard for a circuit, avoid using guards
  3628. that are in the same family as the chosen exit -- not just guards
  3629. that are exactly the chosen exit. (Reported by lodger.)
  3630. o Major bugfixes (resource management):
  3631. - If a directory authority is down, skip it when deciding where to get
  3632. networkstatus objects or descriptors. Otherwise we keep asking
  3633. every 10 seconds forever. Fixes bug 384.
  3634. - Count it as a failure if we fetch a valid network-status but we
  3635. don't want to keep it. Otherwise we'll keep fetching it and keep
  3636. not wanting to keep it. Fixes part of bug 422.
  3637. - If all of our dirservers have given us bad or no networkstatuses
  3638. lately, then stop hammering them once per minute even when we
  3639. think they're failed. Fixes another part of bug 422.
  3640. o Minor bugfixes:
  3641. - Actually set the purpose correctly for descriptors inserted with
  3642. purpose=controller.
  3643. - When we have k non-v2 authorities in our DirServer config,
  3644. we ignored the last k authorities in the list when updating our
  3645. network-statuses.
  3646. - Correctly back-off from requesting router descriptors that we are
  3647. having a hard time downloading.
  3648. - Read resolv.conf files correctly on platforms where read() returns
  3649. partial results on small file reads.
  3650. - Don't rebuild the entire router store every time we get 32K of
  3651. routers: rebuild it when the journal gets very large, or when
  3652. the gaps in the store get very large.
  3653. o Minor features:
  3654. - When routers publish SVN revisions in their router descriptors,
  3655. authorities now include those versions correctly in networkstatus
  3656. documents.
  3657. - Warn when using a version of libevent before 1.3b to run a server on
  3658. OSX or BSD: these versions interact badly with userspace threads.
  3659. Changes in version 0.1.2.13 - 2007-04-24
  3660. This release features some major anonymity fixes, such as safer path
  3661. selection; better client performance; faster bootstrapping, better
  3662. address detection, and better DNS support for servers; write limiting as
  3663. well as read limiting to make servers easier to run; and a huge pile of
  3664. other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
  3665. Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  3666. of the Freenode IRC network, remembering his patience and vision for
  3667. free speech on the Internet.
  3668. o Major features, client performance:
  3669. - Weight directory requests by advertised bandwidth. Now we can
  3670. let servers enable write limiting but still allow most clients to
  3671. succeed at their directory requests. (We still ignore weights when
  3672. choosing a directory authority; I hope this is a feature.)
  3673. - Stop overloading exit nodes -- avoid choosing them for entry or
  3674. middle hops when the total bandwidth available from non-exit nodes
  3675. is much higher than the total bandwidth available from exit nodes.
  3676. - Rather than waiting a fixed amount of time between retrying
  3677. application connections, we wait only 10 seconds for the first,
  3678. 10 seconds for the second, and 15 seconds for each retry after
  3679. that. Hopefully this will improve the expected user experience.
  3680. - Sometimes we didn't bother sending a RELAY_END cell when an attempt
  3681. to open a stream fails; now we do in more cases. This should
  3682. make clients able to find a good exit faster in some cases, since
  3683. unhandleable requests will now get an error rather than timing out.
  3684. o Major features, client functionality:
  3685. - Implement BEGIN_DIR cells, so we can connect to a directory
  3686. server via TLS to do encrypted directory requests rather than
  3687. plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
  3688. config options if you like. For now, this feature only works if
  3689. you already have a descriptor for the destination dirserver.
  3690. - Add support for transparent application connections: this basically
  3691. bundles the functionality of trans-proxy-tor into the Tor
  3692. mainline. Now hosts with compliant pf/netfilter implementations
  3693. can redirect TCP connections straight to Tor without diverting
  3694. through SOCKS. (Based on patch from tup.)
  3695. - Add support for using natd; this allows FreeBSDs earlier than
  3696. 5.1.2 to have ipfw send connections through Tor without using
  3697. SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
  3698. o Major features, servers:
  3699. - Setting up a dyndns name for your server is now optional: servers
  3700. with no hostname or IP address will learn their IP address by
  3701. asking the directory authorities. This code only kicks in when you
  3702. would normally have exited with a "no address" error. Nothing's
  3703. authenticated, so use with care.
  3704. - Directory servers now spool server descriptors, v1 directories,
  3705. and v2 networkstatus objects to buffers as needed rather than en
  3706. masse. They also mmap the cached-routers files. These steps save
  3707. lots of memory.
  3708. - Stop requiring clients to have well-formed certificates, and stop
  3709. checking nicknames in certificates. (Clients have certificates so
  3710. that they can look like Tor servers, but in the future we might want
  3711. to allow them to look like regular TLS clients instead. Nicknames
  3712. in certificates serve no purpose other than making our protocol
  3713. easier to recognize on the wire.) Implements proposal 106.
  3714. o Improvements on DNS support:
  3715. - Add "eventdns" asynchronous dns library originally based on code
  3716. from Adam Langley. Now we can discard the old rickety dnsworker
  3717. concept, and support a wider variety of DNS functions. Allows
  3718. multithreaded builds on NetBSD and OpenBSD again.
  3719. - Add server-side support for "reverse" DNS lookups (using PTR
  3720. records so clients can determine the canonical hostname for a given
  3721. IPv4 address). Only supported by servers using eventdns; servers
  3722. now announce in their descriptors if they don't support eventdns.
  3723. - Workaround for name servers (like Earthlink's) that hijack failing
  3724. DNS requests and replace the no-such-server answer with a "helpful"
  3725. redirect to an advertising-driven search portal. Also work around
  3726. DNS hijackers who "helpfully" decline to hijack known-invalid
  3727. RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
  3728. lets you turn it off.
  3729. - Servers now check for the case when common DNS requests are going to
  3730. wildcarded addresses (i.e. all getting the same answer), and change
  3731. their exit policy to reject *:* if it's happening.
  3732. - When asked to resolve a hostname, don't use non-exit servers unless
  3733. requested to do so. This allows servers with broken DNS to be
  3734. useful to the network.
  3735. - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
  3736. useless IPv6 DNS resolves.
  3737. - Specify and implement client-side SOCKS5 interface for reverse DNS
  3738. lookups (see doc/socks-extensions.txt). Also cache them.
  3739. - When we change nameservers or IP addresses, reset and re-launch
  3740. our tests for DNS hijacking.
  3741. o Improvements on reachability testing:
  3742. - Servers send out a burst of long-range padding cells once they've
  3743. established that they're reachable. Spread them over 4 circuits,
  3744. so hopefully a few will be fast. This exercises bandwidth and
  3745. bootstraps them into the directory more quickly.
  3746. - When we find our DirPort to be reachable, publish a new descriptor
  3747. so we'll tell the world (reported by pnx).
  3748. - Directory authorities now only decide that routers are reachable
  3749. if their identity keys are as expected.
  3750. - Do DirPort reachability tests less often, since a single test
  3751. chews through many circuits before giving up.
  3752. - Avoid some false positives during reachability testing: don't try
  3753. to test via a server that's on the same /24 network as us.
  3754. - Start publishing one minute or so after we find our ORPort
  3755. to be reachable. This will help reduce the number of descriptors
  3756. we have for ourselves floating around, since it's quite likely
  3757. other things (e.g. DirPort) will change during that minute too.
  3758. - Routers no longer try to rebuild long-term connections to directory
  3759. authorities, and directory authorities no longer try to rebuild
  3760. long-term connections to all servers. We still don't hang up
  3761. connections in these two cases though -- we need to look at it
  3762. more carefully to avoid flapping, and we likely need to wait til
  3763. 0.1.1.x is obsolete.
  3764. o Improvements on rate limiting:
  3765. - Enable write limiting as well as read limiting. Now we sacrifice
  3766. capacity if we're pushing out lots of directory traffic, rather
  3767. than overrunning the user's intended bandwidth limits.
  3768. - Include TLS overhead when counting bandwidth usage; previously, we
  3769. would count only the bytes sent over TLS, but not the bytes used
  3770. to send them.
  3771. - Servers decline directory requests much more aggressively when
  3772. they're low on bandwidth. Otherwise they end up queueing more and
  3773. more directory responses, which can't be good for latency.
  3774. - But never refuse directory requests from local addresses.
  3775. - Be willing to read or write on local connections (e.g. controller
  3776. connections) even when the global rate limiting buckets are empty.
  3777. - Flush local controller connection buffers periodically as we're
  3778. writing to them, so we avoid queueing 4+ megabytes of data before
  3779. trying to flush.
  3780. - Revise and clean up the torrc.sample that we ship with; add
  3781. a section for BandwidthRate and BandwidthBurst.
  3782. o Major features, NT services:
  3783. - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
  3784. command-line flag so that admins can override the default by saying
  3785. "tor --service install --user "SomeUser"". This will not affect
  3786. existing installed services. Also, warn the user that the service
  3787. will look for its configuration file in the service user's
  3788. %appdata% directory. (We can't do the "hardwire the user's appdata
  3789. directory" trick any more, since we may not have read access to that
  3790. directory.)
  3791. - Support running the Tor service with a torrc not in the same
  3792. directory as tor.exe and default to using the torrc located in
  3793. the %appdata%\Tor\ of the user who installed the service. Patch
  3794. from Matt Edman.
  3795. - Add an --ignore-missing-torrc command-line option so that we can
  3796. get the "use sensible defaults if the configuration file doesn't
  3797. exist" behavior even when specifying a torrc location on the
  3798. command line.
  3799. - When stopping an NT service, wait up to 10 sec for it to actually
  3800. stop. (Patch from Matt Edman; resolves bug 295.)
  3801. o Directory authority improvements:
  3802. - Stop letting hibernating or obsolete servers affect uptime and
  3803. bandwidth cutoffs.
  3804. - Stop listing hibernating servers in the v1 directory.
  3805. - Authorities no longer recommend exits as guards if this would shift
  3806. too much load to the exit nodes.
  3807. - Authorities now specify server versions in networkstatus. This adds
  3808. about 2% to the size of compressed networkstatus docs, and allows
  3809. clients to tell which servers support BEGIN_DIR and which don't.
  3810. The implementation is forward-compatible with a proposed future
  3811. protocol version scheme not tied to Tor versions.
  3812. - DirServer configuration lines now have an orport= option so
  3813. clients can open encrypted tunnels to the authorities without
  3814. having downloaded their descriptors yet. Enabled for moria1,
  3815. moria2, tor26, and lefkada now in the default configuration.
  3816. - Add a BadDirectory flag to network status docs so that authorities
  3817. can (eventually) tell clients about caches they believe to be
  3818. broken. Not used yet.
  3819. - Allow authorities to list nodes as bad exits in their
  3820. approved-routers file by fingerprint or by address. If most
  3821. authorities set a BadExit flag for a server, clients don't think
  3822. of it as a general-purpose exit. Clients only consider authorities
  3823. that advertise themselves as listing bad exits.
  3824. - Patch from Steve Hildrey: Generate network status correctly on
  3825. non-versioning dirservers.
  3826. - Have directory authorities allow larger amounts of drift in uptime
  3827. without replacing the server descriptor: previously, a server that
  3828. restarted every 30 minutes could have 48 "interesting" descriptors
  3829. per day.
  3830. - Reserve the nickname "Unnamed" for routers that can't pick
  3831. a hostname: any router can call itself Unnamed; directory
  3832. authorities will never allocate Unnamed to any particular router;
  3833. clients won't believe that any router is the canonical Unnamed.
  3834. o Directory mirrors and clients:
  3835. - Discard any v1 directory info that's over 1 month old (for
  3836. directories) or over 1 week old (for running-routers lists).
  3837. - Clients track responses with status 503 from dirservers. After a
  3838. dirserver has given us a 503, we try not to use it until an hour has
  3839. gone by, or until we have no dirservers that haven't given us a 503.
  3840. - When we get a 503 from a directory, and we're not a server, we no
  3841. longer count the failure against the total number of failures
  3842. allowed for the object we're trying to download.
  3843. - Prepare for servers to publish descriptors less often: never
  3844. discard a descriptor simply for being too old until either it is
  3845. recommended by no authorities, or until we get a better one for
  3846. the same router. Make caches consider retaining old recommended
  3847. routers for even longer.
  3848. - Directory servers now provide 'Pragma: no-cache' and 'Expires'
  3849. headers for content, so that we can work better in the presence of
  3850. caching HTTP proxies.
  3851. - Stop fetching descriptors if you're not a dir mirror and you
  3852. haven't tried to establish any circuits lately. (This currently
  3853. causes some dangerous behavior, because when you start up again
  3854. you'll use your ancient server descriptors.)
  3855. o Major fixes, crashes:
  3856. - Stop crashing when the controller asks us to resetconf more than
  3857. one config option at once. (Vidalia 0.0.11 does this.)
  3858. - Fix a longstanding obscure crash bug that could occur when we run
  3859. out of DNS worker processes, if we're not using eventdns. (Resolves
  3860. bug 390.)
  3861. - Fix an assert that could trigger if a controller quickly set then
  3862. cleared EntryNodes. (Bug found by Udo van den Heuvel.)
  3863. - Avoid crash when telling controller about stream-status and a
  3864. stream is detached.
  3865. - Avoid sending junk to controllers or segfaulting when a controller
  3866. uses EVENT_NEW_DESC with verbose nicknames.
  3867. - Stop triggering asserts if the controller tries to extend hidden
  3868. service circuits (reported by mwenge).
  3869. - If we start a server with ClientOnly 1, then set ClientOnly to 0
  3870. and hup, stop triggering an assert based on an empty onion_key.
  3871. - Mask out all signals in sub-threads; only the libevent signal
  3872. handler should be processing them. This should prevent some crashes
  3873. on some machines using pthreads. (Patch from coderman.)
  3874. - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
  3875. o Major fixes, anonymity/security:
  3876. - Automatically avoid picking more than one node from the same
  3877. /16 network when constructing a circuit. Add an
  3878. "EnforceDistinctSubnets" option to let people disable it if they
  3879. want to operate private test networks on a single subnet.
  3880. - When generating bandwidth history, round down to the nearest
  3881. 1k. When storing accounting data, round up to the nearest 1k.
  3882. - When we're running as a server, remember when we last rotated onion
  3883. keys, so that we will rotate keys once they're a week old even if
  3884. we never stay up for a week ourselves.
  3885. - If a client asked for a server by name, and there's a named server
  3886. in our network-status but we don't have its descriptor yet, we
  3887. could return an unnamed server instead.
  3888. - Reject (most) attempts to use Tor circuits with length one. (If
  3889. many people start using Tor as a one-hop proxy, exit nodes become
  3890. a more attractive target for compromise.)
  3891. - Just because your DirPort is open doesn't mean people should be
  3892. able to remotely teach you about hidden service descriptors. Now
  3893. only accept rendezvous posts if you've got HSAuthoritativeDir set.
  3894. - Fix a potential race condition in the rpm installer. Found by
  3895. Stefan Nordhausen.
  3896. - Do not log IPs with TLS failures for incoming TLS
  3897. connections. (Fixes bug 382.)
  3898. o Major fixes, other:
  3899. - If our system clock jumps back in time, don't publish a negative
  3900. uptime in the descriptor.
  3901. - When we start during an accounting interval before it's time to wake
  3902. up, remember to wake up at the correct time. (May fix bug 342.)
  3903. - Previously, we would cache up to 16 old networkstatus documents
  3904. indefinitely, if they came from nontrusted authorities. Now we
  3905. discard them if they are more than 10 days old.
  3906. - When we have a state file we cannot parse, tell the user and
  3907. move it aside. Now we avoid situations where the user starts
  3908. Tor in 1904, Tor writes a state file with that timestamp in it,
  3909. the user fixes her clock, and Tor refuses to start.
  3910. - Publish a new descriptor after we hup/reload. This is important
  3911. if our config has changed such that we'll want to start advertising
  3912. our DirPort now, etc.
  3913. - If we are using an exit enclave and we can't connect, e.g. because
  3914. its webserver is misconfigured to not listen on localhost, then
  3915. back off and try connecting from somewhere else before we fail.
  3916. o New config options or behaviors:
  3917. - When EntryNodes are configured, rebuild the guard list to contain,
  3918. in order: the EntryNodes that were guards before; the rest of the
  3919. EntryNodes; the nodes that were guards before.
  3920. - Do not warn when individual nodes in the configuration's EntryNodes,
  3921. ExitNodes, etc are down: warn only when all possible nodes
  3922. are down. (Fixes bug 348.)
  3923. - Put a lower-bound on MaxAdvertisedBandwidth.
  3924. - Start using the state file to store bandwidth accounting data:
  3925. the bw_accounting file is now obsolete. We'll keep generating it
  3926. for a while for people who are still using 0.1.2.4-alpha.
  3927. - Try to batch changes to the state file so that we do as few
  3928. disk writes as possible while still storing important things in
  3929. a timely fashion.
  3930. - The state file and the bw_accounting file get saved less often when
  3931. the AvoidDiskWrites config option is set.
  3932. - Make PIDFile work on Windows.
  3933. - Add internal descriptions for a bunch of configuration options:
  3934. accessible via controller interface and in comments in saved
  3935. options files.
  3936. - Reject *:563 (NNTPS) in the default exit policy. We already reject
  3937. NNTP by default, so this seems like a sensible addition.
  3938. - Clients now reject hostnames with invalid characters. This should
  3939. avoid some inadvertent info leaks. Add an option
  3940. AllowNonRFC953Hostnames to disable this behavior, in case somebody
  3941. is running a private network with hosts called @, !, and #.
  3942. - Check for addresses with invalid characters at the exit as well,
  3943. and warn less verbosely when they fail. You can override this by
  3944. setting ServerDNSAllowNonRFC953Addresses to 1.
  3945. - Remove some options that have been deprecated since at least
  3946. 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
  3947. SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
  3948. to set log options. Mark PathlenCoinWeight as obsolete.
  3949. - Stop accepting certain malformed ports in configured exit policies.
  3950. - When the user uses bad syntax in the Log config line, stop
  3951. suggesting other bad syntax as a replacement.
  3952. - Add new config option "ResolvConf" to let the server operator
  3953. choose an alternate resolve.conf file when using eventdns.
  3954. - If one of our entry guards is on the ExcludeNodes list, or the
  3955. directory authorities don't think it's a good guard, treat it as
  3956. if it were unlisted: stop using it as a guard, and throw it off
  3957. the guards list if it stays that way for a long time.
  3958. - Allow directory authorities to be marked separately as authorities
  3959. for the v1 directory protocol, the v2 directory protocol, and
  3960. as hidden service directories, to make it easier to retire old
  3961. authorities. V1 authorities should set "HSAuthoritativeDir 1"
  3962. to continue being hidden service authorities too.
  3963. - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
  3964. - Make TrackExitHosts case-insensitive, and fix the behavior of
  3965. ".suffix" TrackExitHosts items to avoid matching in the middle of
  3966. an address.
  3967. - New DirPort behavior: if you have your dirport set, you download
  3968. descriptors aggressively like a directory mirror, whether or not
  3969. your ORPort is set.
  3970. o Docs:
  3971. - Create a new file ReleaseNotes which was the old ChangeLog. The
  3972. new ChangeLog file now includes the notes for all development
  3973. versions too.
  3974. - Add a new address-spec.txt document to describe our special-case
  3975. addresses: .exit, .onion, and .noconnnect.
  3976. - Fork the v1 directory protocol into its own spec document,
  3977. and mark dir-spec.txt as the currently correct (v2) spec.
  3978. o Packaging, porting, and contrib
  3979. - "tor --verify-config" now exits with -1(255) or 0 depending on
  3980. whether the config options are bad or good.
  3981. - The Debian package now uses --verify-config when (re)starting,
  3982. to distinguish configuration errors from other errors.
  3983. - Adapt a patch from goodell to let the contrib/exitlist script
  3984. take arguments rather than require direct editing.
  3985. - Prevent the contrib/exitlist script from printing the same
  3986. result more than once.
  3987. - Add support to tor-resolve tool for reverse lookups and SOCKS5.
  3988. - In the hidden service example in torrc.sample, stop recommending
  3989. esoteric and discouraged hidden service options.
  3990. - Patch from Michael Mohr to contrib/cross.sh, so it checks more
  3991. values before failing, and always enables eventdns.
  3992. - Try to detect Windows correctly when cross-compiling.
  3993. - Libevent-1.2 exports, but does not define in its headers, strlcpy.
  3994. Try to fix this in configure.in by checking for most functions
  3995. before we check for libevent.
  3996. - Update RPMs to require libevent 1.2.
  3997. - Experimentally re-enable kqueue on OSX when using libevent 1.1b
  3998. or later. Log when we are doing this, so we can diagnose it when
  3999. it fails. (Also, recommend libevent 1.1b for kqueue and
  4000. win32 methods; deprecate libevent 1.0b harder; make libevent
  4001. recommendation system saner.)
  4002. - Build with recent (1.3+) libevents on platforms that do not
  4003. define the nonstandard types "u_int8_t" and friends.
  4004. - Remove architecture from OS X builds. The official builds are
  4005. now universal binaries.
  4006. - Run correctly on OS X platforms with case-sensitive filesystems.
  4007. - Correctly set maximum connection limit on Cygwin. (This time
  4008. for sure!)
  4009. - Start compiling on MinGW on Windows (patches from Mike Chiussi
  4010. and many others).
  4011. - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
  4012. - Finally fix the openssl warnings from newer gccs that believe that
  4013. ignoring a return value is okay, but casting a return value and
  4014. then ignoring it is a sign of madness.
  4015. - On architectures where sizeof(int)>4, still clamp declarable
  4016. bandwidth to INT32_MAX.
  4017. o Minor features, controller:
  4018. - Warn the user when an application uses the obsolete binary v0
  4019. control protocol. We're planning to remove support for it during
  4020. the next development series, so it's good to give people some
  4021. advance warning.
  4022. - Add STREAM_BW events to report per-entry-stream bandwidth
  4023. use. (Patch from Robert Hogan.)
  4024. - Rate-limit SIGNEWNYM signals in response to controllers that
  4025. impolitely generate them for every single stream. (Patch from
  4026. mwenge; closes bug 394.)
  4027. - Add a REMAP status to stream events to note that a stream's
  4028. address has changed because of a cached address or a MapAddress
  4029. directive.
  4030. - Make REMAP stream events have a SOURCE (cache or exit), and
  4031. make them generated in every case where we get a successful
  4032. connected or resolved cell.
  4033. - Track reasons for OR connection failure; make these reasons
  4034. available via the controller interface. (Patch from Mike Perry.)
  4035. - Add a SOCKS_BAD_HOSTNAME client status event so controllers
  4036. can learn when clients are sending malformed hostnames to Tor.
  4037. - Specify and implement some of the controller status events.
  4038. - Have GETINFO dir/status/* work on hosts with DirPort disabled.
  4039. - Reimplement GETINFO so that info/names stays in sync with the
  4040. actual keys.
  4041. - Implement "GETINFO fingerprint".
  4042. - Implement "SETEVENTS GUARD" so controllers can get updates on
  4043. entry guard status as it changes.
  4044. - Make all connections to addresses of the form ".noconnect"
  4045. immediately get closed. This lets application/controller combos
  4046. successfully test whether they're talking to the same Tor by
  4047. watching for STREAM events.
  4048. - Add a REASON field to CIRC events; for backward compatibility, this
  4049. field is sent only to controllers that have enabled the extended
  4050. event format. Also, add additional reason codes to explain why
  4051. a given circuit has been destroyed or truncated. (Patches from
  4052. Mike Perry)
  4053. - Add a REMOTE_REASON field to extended CIRC events to tell the
  4054. controller why a remote OR told us to close a circuit.
  4055. - Stream events also now have REASON and REMOTE_REASON fields,
  4056. working much like those for circuit events.
  4057. - There's now a GETINFO ns/... field so that controllers can ask Tor
  4058. about the current status of a router.
  4059. - A new event type "NS" to inform a controller when our opinion of
  4060. a router's status has changed.
  4061. - Add a GETINFO events/names and GETINFO features/names so controllers
  4062. can tell which events and features are supported.
  4063. - A new CLEARDNSCACHE signal to allow controllers to clear the
  4064. client-side DNS cache without expiring circuits.
  4065. - Fix CIRC controller events so that controllers can learn the
  4066. identity digests of non-Named servers used in circuit paths.
  4067. - Let controllers ask for more useful identifiers for servers. Instead
  4068. of learning identity digests for un-Named servers and nicknames
  4069. for Named servers, the new identifiers include digest, nickname,
  4070. and indication of Named status. Off by default; see control-spec.txt
  4071. for more information.
  4072. - Add a "getinfo address" controller command so it can display Tor's
  4073. best guess to the user.
  4074. - New controller event to alert the controller when our server
  4075. descriptor has changed.
  4076. - Give more meaningful errors on controller authentication failure.
  4077. - Export the default exit policy via the control port, so controllers
  4078. don't need to guess what it is / will be later.
  4079. o Minor bugfixes, controller:
  4080. - When creating a circuit via the controller, send a 'launched'
  4081. event when we're done, so we follow the spec better.
  4082. - Correct the control spec to match how the code actually responds
  4083. to 'getinfo addr-mappings/*'. Reported by daejees.
  4084. - The control spec described a GUARDS event, but the code
  4085. implemented a GUARD event. Standardize on GUARD, but let people
  4086. ask for GUARDS too. Reported by daejees.
  4087. - Give the controller END_STREAM_REASON_DESTROY events _before_ we
  4088. clear the corresponding on_circuit variable, and remember later
  4089. that we don't need to send a redundant CLOSED event. (Resolves part
  4090. 3 of bug 367.)
  4091. - Report events where a resolve succeeded or where we got a socks
  4092. protocol error correctly, rather than calling both of them
  4093. "INTERNAL".
  4094. - Change reported stream target addresses to IP consistently when
  4095. we finally get the IP from an exit node.
  4096. - Send log messages to the controller even if they happen to be very
  4097. long.
  4098. - Flush ERR-level controller status events just like we currently
  4099. flush ERR-level log events, so that a Tor shutdown doesn't prevent
  4100. the controller from learning about current events.
  4101. - Report the circuit number correctly in STREAM CLOSED events. Bug
  4102. reported by Mike Perry.
  4103. - Do not report bizarre values for results of accounting GETINFOs
  4104. when the last second's write or read exceeds the allotted bandwidth.
  4105. - Report "unrecognized key" rather than an empty string when the
  4106. controller tries to fetch a networkstatus that doesn't exist.
  4107. - When the controller does a "GETINFO network-status", tell it
  4108. about even those routers whose descriptors are very old, and use
  4109. long nicknames where appropriate.
  4110. - Fix handling of verbose nicknames with ORCONN controller events:
  4111. make them show up exactly when requested, rather than exactly when
  4112. not requested.
  4113. - Controller signals now work on non-Unix platforms that don't define
  4114. SIGUSR1 and SIGUSR2 the way we expect.
  4115. - Respond to SIGNAL command before we execute the signal, in case
  4116. the signal shuts us down. Suggested by Karsten Loesing.
  4117. - Handle reporting OR_CONN_EVENT_NEW events to the controller.
  4118. o Minor features, code performance:
  4119. - Major performance improvement on inserting descriptors: change
  4120. algorithm from O(n^2) to O(n).
  4121. - Do not rotate onion key immediately after setting it for the first
  4122. time.
  4123. - Call router_have_min_dir_info half as often. (This is showing up in
  4124. some profiles, but not others.)
  4125. - When using GCC, make log_debug never get called at all, and its
  4126. arguments never get evaluated, when no debug logs are configured.
  4127. (This is showing up in some profiles, but not others.)
  4128. - Statistics dumped by -USR2 now include a breakdown of public key
  4129. operations, for profiling.
  4130. - Make the common memory allocation path faster on machines where
  4131. malloc(0) returns a pointer.
  4132. - Split circuit_t into origin_circuit_t and or_circuit_t, and
  4133. split connection_t into edge, or, dir, control, and base structs.
  4134. These will save quite a bit of memory on busy servers, and they'll
  4135. also help us track down bugs in the code and bugs in the spec.
  4136. - Use OpenSSL's AES implementation on platforms where it's faster.
  4137. This could save us as much as 10% CPU usage.
  4138. o Minor features, descriptors and descriptor handling:
  4139. - Avoid duplicate entries on MyFamily line in server descriptor.
  4140. - When Tor receives a router descriptor that it asked for, but
  4141. no longer wants (because it has received fresh networkstatuses
  4142. in the meantime), do not warn the user. Cache the descriptor if
  4143. we're a cache; drop it if we aren't.
  4144. - Servers no longer ever list themselves in their "family" line,
  4145. even if configured to do so. This makes it easier to configure
  4146. family lists conveniently.
  4147. o Minor fixes, confusing/misleading log messages:
  4148. - Display correct results when reporting which versions are
  4149. recommended, and how recommended they are. (Resolves bug 383.)
  4150. - Inform the server operator when we decide not to advertise a
  4151. DirPort due to AccountingMax enabled or a low BandwidthRate.
  4152. - Only include function names in log messages for info/debug messages.
  4153. For notice/warn/err, the content of the message should be clear on
  4154. its own, and printing the function name only confuses users.
  4155. - Remove even more protocol-related warnings from Tor server logs,
  4156. such as bad TLS handshakes and malformed begin cells.
  4157. - Fix bug 314: Tor clients issued "unsafe socks" warnings even
  4158. when the IP address is mapped through MapAddress to a hostname.
  4159. - Fix misleading log messages: an entry guard that is "unlisted",
  4160. as well as not known to be "down" (because we've never heard
  4161. of it), is not therefore "up".
  4162. o Minor fixes, old/obsolete behavior:
  4163. - Start assuming we can use a create_fast cell if we don't know
  4164. what version a router is running.
  4165. - We no longer look for identity and onion keys in "identity.key" and
  4166. "onion.key" -- these were replaced by secret_id_key and
  4167. secret_onion_key in 0.0.8pre1.
  4168. - We no longer require unrecognized directory entries to be
  4169. preceded by "opt".
  4170. - Drop compatibility with obsolete Tors that permit create cells
  4171. to have the wrong circ_id_type.
  4172. - Remove code to special-case "-cvs" ending, since it has not
  4173. actually mattered since 0.0.9.
  4174. - Don't re-write the fingerprint file every restart, unless it has
  4175. changed.
  4176. o Minor fixes, misc client-side behavior:
  4177. - Always remove expired routers and networkstatus docs before checking
  4178. whether we have enough information to build circuits. (Fixes
  4179. bug 373.)
  4180. - When computing clock skew from directory HTTP headers, consider what
  4181. time it was when we finished asking for the directory, not what
  4182. time it is now.
  4183. - Make our socks5 handling more robust to broken socks clients:
  4184. throw out everything waiting on the buffer in between socks
  4185. handshake phases, since they can't possibly (so the theory
  4186. goes) have predicted what we plan to respond to them.
  4187. - Expire socks connections if they spend too long waiting for the
  4188. handshake to finish. Previously we would let them sit around for
  4189. days, if the connecting application didn't close them either.
  4190. - And if the socks handshake hasn't started, don't send a
  4191. "DNS resolve socks failed" handshake reply; just close it.
  4192. - If the user asks to use invalid exit nodes, be willing to use
  4193. unstable ones.
  4194. - Track unreachable entry guards correctly: don't conflate
  4195. 'unreachable by us right now' with 'listed as down by the directory
  4196. authorities'. With the old code, if a guard was unreachable by us
  4197. but listed as running, it would clog our guard list forever.
  4198. - Behave correctly in case we ever have a network with more than
  4199. 2GB/s total advertised capacity.
  4200. - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
  4201. - Fix a memory leak when we ask for "all" networkstatuses and we
  4202. get one we don't recognize.
  4203. Changes in version 0.1.1.26 - 2006-12-14
  4204. o Security bugfixes:
  4205. - Stop sending the HttpProxyAuthenticator string to directory
  4206. servers when directory connections are tunnelled through Tor.
  4207. - Clients no longer store bandwidth history in the state file.
  4208. - Do not log introduction points for hidden services if SafeLogging
  4209. is set.
  4210. o Minor bugfixes:
  4211. - Fix an assert failure when a directory authority sets
  4212. AuthDirRejectUnlisted and then receives a descriptor from an
  4213. unlisted router (reported by seeess).
  4214. Changes in version 0.1.1.25 - 2006-11-04
  4215. o Major bugfixes:
  4216. - When a client asks us to resolve (rather than connect to)
  4217. an address, and we have a cached answer, give them the cached
  4218. answer. Previously, we would give them no answer at all.
  4219. - We were building exactly the wrong circuits when we predict
  4220. hidden service requirements, meaning Tor would have to build all
  4221. its circuits on demand.
  4222. - If none of our live entry guards have a high uptime, but we
  4223. require a guard with a high uptime, try adding a new guard before
  4224. we give up on the requirement. This patch should make long-lived
  4225. connections more stable on average.
  4226. - When testing reachability of our DirPort, don't launch new
  4227. tests when there's already one in progress -- unreachable
  4228. servers were stacking up dozens of testing streams.
  4229. o Security bugfixes:
  4230. - When the user sends a NEWNYM signal, clear the client-side DNS
  4231. cache too. Otherwise we continue to act on previous information.
  4232. o Minor bugfixes:
  4233. - Avoid a memory corruption bug when creating a hash table for
  4234. the first time.
  4235. - Avoid possibility of controller-triggered crash when misusing
  4236. certain commands from a v0 controller on platforms that do not
  4237. handle printf("%s",NULL) gracefully.
  4238. - Avoid infinite loop on unexpected controller input.
  4239. - Don't log spurious warnings when we see a circuit close reason we
  4240. don't recognize; it's probably just from a newer version of Tor.
  4241. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  4242. Tor/Privoxy we also uninstall Vidalia.
  4243. Changes in version 0.1.1.24 - 2006-09-29
  4244. o Major bugfixes:
  4245. - Allow really slow clients to not hang up five minutes into their
  4246. directory downloads (suggested by Adam J. Richter).
  4247. - Fix major performance regression from 0.1.0.x: instead of checking
  4248. whether we have enough directory information every time we want to
  4249. do something, only check when the directory information has changed.
  4250. This should improve client CPU usage by 25-50%.
  4251. - Don't crash if, after a server has been running for a while,
  4252. it can't resolve its hostname.
  4253. - When a client asks us to resolve (not connect to) an address,
  4254. and we have a cached answer, give them the cached answer.
  4255. Previously, we would give them no answer at all.
  4256. o Minor bugfixes:
  4257. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  4258. - Don't crash when the controller receives a third argument to an
  4259. "extendcircuit" request.
  4260. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  4261. response; fix error code when "getinfo dir/status/" fails.
  4262. - Fix configure.in to not produce broken configure files with
  4263. more recent versions of autoconf. Thanks to Clint for his auto*
  4264. voodoo.
  4265. - Fix security bug on NetBSD that could allow someone to force
  4266. uninitialized RAM to be sent to a server's DNS resolver. This
  4267. only affects NetBSD and other platforms that do not bounds-check
  4268. tolower().
  4269. - Warn user when using libevent 1.1a or earlier with win32 or kqueue
  4270. methods: these are known to be buggy.
  4271. - If we're a directory mirror and we ask for "all" network status
  4272. documents, we would discard status documents from authorities
  4273. we don't recognize.
  4274. Changes in version 0.1.1.23 - 2006-07-30
  4275. o Major bugfixes:
  4276. - Fast Tor servers, especially exit nodes, were triggering asserts
  4277. due to a bug in handling the list of pending DNS resolves. Some
  4278. bugs still remain here; we're hunting them.
  4279. - Entry guards could crash clients by sending unexpected input.
  4280. - More fixes on reachability testing: if you find yourself reachable,
  4281. then don't ever make any client requests (so you stop predicting
  4282. circuits), then hup or have your clock jump, then later your IP
  4283. changes, you won't think circuits are working, so you won't try to
  4284. test reachability, so you won't publish.
  4285. o Minor bugfixes:
  4286. - Avoid a crash if the controller does a resetconf firewallports
  4287. and then a setconf fascistfirewall=1.
  4288. - Avoid an integer underflow when the dir authority decides whether
  4289. a router is stable: we might wrongly label it stable, and compute
  4290. a slightly wrong median stability, when a descriptor is published
  4291. later than now.
  4292. - Fix a place where we might trigger an assert if we can't build our
  4293. own server descriptor yet.
  4294. Changes in version 0.1.1.22 - 2006-07-05
  4295. o Major bugfixes:
  4296. - Fix a big bug that was causing servers to not find themselves
  4297. reachable if they changed IP addresses. Since only 0.1.1.22+
  4298. servers can do reachability testing correctly, now we automatically
  4299. make sure to test via one of these.
  4300. - Fix to allow clients and mirrors to learn directory info from
  4301. descriptor downloads that get cut off partway through.
  4302. - Directory authorities had a bug in deciding if a newly published
  4303. descriptor was novel enough to make everybody want a copy -- a few
  4304. servers seem to be publishing new descriptors many times a minute.
  4305. o Minor bugfixes:
  4306. - Fix a rare bug that was causing some servers to complain about
  4307. "closing wedged cpuworkers" and skip some circuit create requests.
  4308. - Make the Exit flag in directory status documents actually work.
  4309. Changes in version 0.1.1.21 - 2006-06-10
  4310. o Crash and assert fixes from 0.1.1.20:
  4311. - Fix a rare crash on Tor servers that have enabled hibernation.
  4312. - Fix a seg fault on startup for Tor networks that use only one
  4313. directory authority.
  4314. - Fix an assert from a race condition that occurs on Tor servers
  4315. while exiting, where various threads are trying to log that they're
  4316. exiting, and delete the logs, at the same time.
  4317. - Make our unit tests pass again on certain obscure platforms.
  4318. o Other fixes:
  4319. - Add support for building SUSE RPM packages.
  4320. - Speed up initial bootstrapping for clients: if we are making our
  4321. first ever connection to any entry guard, then don't mark it down
  4322. right after that.
  4323. - When only one Tor server in the network is labelled as a guard,
  4324. and we've already picked him, we would cycle endlessly picking him
  4325. again, being unhappy about it, etc. Now we specifically exclude
  4326. current guards when picking a new guard.
  4327. - Servers send create cells more reliably after the TLS connection
  4328. is established: we were sometimes forgetting to send half of them
  4329. when we had more than one pending.
  4330. - If we get a create cell that asks us to extend somewhere, but the
  4331. Tor server there doesn't match the expected digest, we now send
  4332. a destroy cell back, rather than silently doing nothing.
  4333. - Make options->RedirectExit work again.
  4334. - Make cookie authentication for the controller work again.
  4335. - Stop being picky about unusual characters in the arguments to
  4336. mapaddress. It's none of our business.
  4337. - Add a new config option "TestVia" that lets you specify preferred
  4338. middle hops to use for test circuits. Perhaps this will let me
  4339. debug the reachability problems better.
  4340. o Log / documentation fixes:
  4341. - If we're a server and some peer has a broken TLS certificate, don't
  4342. log about it unless ProtocolWarnings is set, i.e., we want to hear
  4343. about protocol violations by others.
  4344. - Fix spelling of VirtualAddrNetwork in man page.
  4345. - Add a better explanation at the top of the autogenerated torrc file
  4346. about what happened to our old torrc.
  4347. Changes in version 0.1.1.20 - 2006-05-23
  4348. o Crash and assert fixes from 0.1.0.17:
  4349. - Fix assert bug in close_logs() on exit: when we close and delete
  4350. logs, remove them all from the global "logfiles" list.
  4351. - Fix an assert error when we're out of space in the connection_list
  4352. and we try to post a hidden service descriptor (reported by Peter
  4353. Palfrader).
  4354. - Fix a rare assert error when we've tried all intro points for
  4355. a hidden service and we try fetching the service descriptor again:
  4356. "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
  4357. - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
  4358. out and refuse the setconf if it would fail.
  4359. - If you specify a relative torrc path and you set RunAsDaemon in
  4360. your torrc, then it chdir()'s to the new directory. If you then
  4361. HUP, it tries to load the new torrc location, fails, and exits.
  4362. The fix: no longer allow a relative path to torrc when using -f.
  4363. - Check for integer overflows in more places, when adding elements
  4364. to smartlists. This could possibly prevent a buffer overflow
  4365. on malicious huge inputs.
  4366. o Security fixes, major:
  4367. - When we're printing strings from the network, don't try to print
  4368. non-printable characters. Now we're safer against shell escape
  4369. sequence exploits, and also against attacks to fool users into
  4370. misreading their logs.
  4371. - Implement entry guards: automatically choose a handful of entry
  4372. nodes and stick with them for all circuits. Only pick new guards
  4373. when the ones you have are unsuitable, and if the old guards
  4374. become suitable again, switch back. This will increase security
  4375. dramatically against certain end-point attacks. The EntryNodes
  4376. config option now provides some hints about which entry guards you
  4377. want to use most; and StrictEntryNodes means to only use those.
  4378. Fixes CVE-2006-0414.
  4379. - Implement exit enclaves: if we know an IP address for the
  4380. destination, and there's a running Tor server at that address
  4381. which allows exit to the destination, then extend the circuit to
  4382. that exit first. This provides end-to-end encryption and end-to-end
  4383. authentication. Also, if the user wants a .exit address or enclave,
  4384. use 4 hops rather than 3, and cannibalize a general circ for it
  4385. if you can.
  4386. - Obey our firewall options more faithfully:
  4387. . If we can't get to a dirserver directly, try going via Tor.
  4388. . Don't ever try to connect (as a client) to a place our
  4389. firewall options forbid.
  4390. . If we specify a proxy and also firewall options, obey the
  4391. firewall options even when we're using the proxy: some proxies
  4392. can only proxy to certain destinations.
  4393. - Make clients regenerate their keys when their IP address changes.
  4394. - For the OS X package's modified privoxy config file, comment
  4395. out the "logfile" line so we don't log everything passed
  4396. through privoxy.
  4397. - Our TLS handshakes were generating a single public/private
  4398. keypair for the TLS context, rather than making a new one for
  4399. each new connection. Oops. (But we were still rotating them
  4400. periodically, so it's not so bad.)
  4401. - When we were cannibalizing a circuit with a particular exit
  4402. node in mind, we weren't checking to see if that exit node was
  4403. already present earlier in the circuit. Now we are.
  4404. - Require server descriptors to list IPv4 addresses -- hostnames
  4405. are no longer allowed. This also fixes potential vulnerabilities
  4406. to servers providing hostnames as their address and then
  4407. preferentially resolving them so they can partition users.
  4408. - Our logic to decide if the OR we connected to was the right guy
  4409. was brittle and maybe open to a mitm for invalid routers.
  4410. o Security fixes, minor:
  4411. - Adjust tor-spec.txt to parameterize cell and key lengths. Now
  4412. Ian Goldberg can prove things about our handshake protocol more
  4413. easily.
  4414. - Make directory authorities generate a separate "guard" flag to
  4415. mean "would make a good entry guard". Clients now honor the
  4416. is_guard flag rather than looking at is_fast or is_stable.
  4417. - Try to list MyFamily elements by key, not by nickname, and warn
  4418. if we've not heard of a server.
  4419. - Start using RAND_bytes rather than RAND_pseudo_bytes from
  4420. OpenSSL. Also, reseed our entropy every hour, not just at
  4421. startup. And add entropy in 512-bit chunks, not 160-bit chunks.
  4422. - Refuse server descriptors where the fingerprint line doesn't match
  4423. the included identity key. Tor doesn't care, but other apps (and
  4424. humans) might actually be trusting the fingerprint line.
  4425. - We used to kill the circuit when we receive a relay command we
  4426. don't recognize. Now we just drop that cell.
  4427. - Fix a bug found by Lasse Overlier: when we were making internal
  4428. circuits (intended to be cannibalized later for rendezvous and
  4429. introduction circuits), we were picking them so that they had
  4430. useful exit nodes. There was no need for this, and it actually
  4431. aids some statistical attacks.
  4432. - Start treating internal circuits and exit circuits separately.
  4433. It's important to keep them separate because internal circuits
  4434. have their last hops picked like middle hops, rather than like
  4435. exit hops. So exiting on them will break the user's expectations.
  4436. - Fix a possible way to DoS dirservers.
  4437. - When the client asked for a rendezvous port that the hidden
  4438. service didn't want to provide, we were sending an IP address
  4439. back along with the end cell. Fortunately, it was zero. But stop
  4440. that anyway.
  4441. o Packaging improvements:
  4442. - Implement --with-libevent-dir option to ./configure. Improve
  4443. search techniques to find libevent, and use those for openssl too.
  4444. - Fix a couple of bugs in OpenSSL detection. Deal better when
  4445. there are multiple SSLs installed with different versions.
  4446. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
  4447. - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
  4448. "-Wall -g -O2".
  4449. - Make unit tests (and other invocations that aren't the real Tor)
  4450. run without launching listeners, creating subdirectories, and so on.
  4451. - The OS X installer was adding a symlink for tor_resolve but
  4452. the binary was called tor-resolve (reported by Thomas Hardly).
  4453. - Now we can target arch and OS in rpm builds (contributed by
  4454. Phobos). Also make the resulting dist-rpm filename match the
  4455. target arch.
  4456. - Apply Matt Ghali's --with-syslog-facility patch to ./configure
  4457. if you log to syslog and want something other than LOG_DAEMON.
  4458. - Fix the torify (tsocks) config file to not use Tor for localhost
  4459. connections.
  4460. - Start shipping socks-extensions.txt, tor-doc-unix.html,
  4461. tor-doc-server.html, and stylesheet.css in the tarball.
  4462. - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
  4463. They are useless now.
  4464. - Add Peter Palfrader's contributed check-tor script. It lets you
  4465. easily check whether a given server (referenced by nickname)
  4466. is reachable by you.
  4467. - Add BSD-style contributed startup script "rc.subr" from Peter
  4468. Thoenen.
  4469. o Directory improvements -- new directory protocol:
  4470. - See tor/doc/dir-spec.txt for all the juicy details. Key points:
  4471. - Authorities and caches publish individual descriptors (by
  4472. digest, by fingerprint, by "all", and by "tell me yours").
  4473. - Clients don't download or use the old directory anymore. Now they
  4474. download network-statuses from the directory authorities, and
  4475. fetch individual server descriptors as needed from mirrors.
  4476. - Clients don't download descriptors of non-running servers.
  4477. - Download descriptors by digest, not by fingerprint. Caches try to
  4478. download all listed digests from authorities; clients try to
  4479. download "best" digests from caches. This avoids partitioning
  4480. and isolating attacks better.
  4481. - Only upload a new server descriptor when options change, 18
  4482. hours have passed, uptime is reset, or bandwidth changes a lot.
  4483. - Directory authorities silently throw away new descriptors that
  4484. haven't changed much if the timestamps are similar. We do this to
  4485. tolerate older Tor servers that upload a new descriptor every 15
  4486. minutes. (It seemed like a good idea at the time.)
  4487. - Clients choose directory servers from the network status lists,
  4488. not from their internal list of router descriptors. Now they can
  4489. go to caches directly rather than needing to go to authorities
  4490. to bootstrap the first set of descriptors.
  4491. - When picking a random directory, prefer non-authorities if any
  4492. are known.
  4493. - Add a new flag to network-status indicating whether the server
  4494. can answer v2 directory requests too.
  4495. - Directory mirrors now cache up to 16 unrecognized network-status
  4496. docs, so new directory authorities will be cached too.
  4497. - Stop parsing, storing, or using running-routers output (but
  4498. mirrors still cache and serve it).
  4499. - Clients consider a threshold of "versioning" directory authorities
  4500. before deciding whether to warn the user that he's obsolete.
  4501. - Authorities publish separate sorted lists of recommended versions
  4502. for clients and for servers.
  4503. - Change DirServers config line to note which dirs are v1 authorities.
  4504. - Put nicknames on the DirServer line, so we can refer to them
  4505. without requiring all our users to memorize their IP addresses.
  4506. - Remove option when getting directory cache to see whether they
  4507. support running-routers; they all do now. Replace it with one
  4508. to see whether caches support v2 stuff.
  4509. - Stop listing down or invalid nodes in the v1 directory. This
  4510. reduces its bulk by about 1/3, and reduces load on mirrors.
  4511. - Mirrors no longer cache the v1 directory as often.
  4512. - If we as a directory mirror don't know of any v1 directory
  4513. authorities, then don't try to cache any v1 directories.
  4514. o Other directory improvements:
  4515. - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
  4516. fifth authoritative directory servers.
  4517. - Directory authorities no longer require an open connection from
  4518. a server to consider him "reachable". We need this change because
  4519. when we add new directory authorities, old servers won't know not
  4520. to hang up on them.
  4521. - Dir authorities now do their own external reachability testing
  4522. of each server, and only list as running the ones they found to
  4523. be reachable. We also send back warnings to the server's logs if
  4524. it uploads a descriptor that we already believe is unreachable.
  4525. - Spread the directory authorities' reachability testing over the
  4526. entire testing interval, so we don't try to do 500 TLS's at once
  4527. every 20 minutes.
  4528. - Make the "stable" router flag in network-status be the median of
  4529. the uptimes of running valid servers, and make clients pay
  4530. attention to the network-status flags. Thus the cutoff adapts
  4531. to the stability of the network as a whole, making IRC, IM, etc
  4532. connections more reliable.
  4533. - Make the v2 dir's "Fast" flag based on relative capacity, just
  4534. like "Stable" is based on median uptime. Name everything in the
  4535. top 7/8 Fast, and only the top 1/2 gets to be a Guard.
  4536. - Retry directory requests if we fail to get an answer we like
  4537. from a given dirserver (we were retrying before, but only if
  4538. we fail to connect).
  4539. - Return a robots.txt on our dirport to discourage google indexing.
  4540. o Controller protocol improvements:
  4541. - Revised controller protocol (version 1) that uses ascii rather
  4542. than binary: tor/doc/control-spec.txt. Add supporting libraries
  4543. in python and java and c# so you can use the controller from your
  4544. applications without caring how our protocol works.
  4545. - Allow the DEBUG controller event to work again. Mark certain log
  4546. entries as "don't tell this to controllers", so we avoid cycles.
  4547. - New controller function "getinfo accounting", to ask how
  4548. many bytes we've used in this time period.
  4549. - Add a "resetconf" command so you can set config options like
  4550. AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
  4551. a config option in the torrc with no value, then it clears it
  4552. entirely (rather than setting it to its default).
  4553. - Add a "getinfo config-file" to tell us where torrc is. Also
  4554. expose guard nodes, config options/names.
  4555. - Add a "quit" command (when when using the controller manually).
  4556. - Add a new signal "newnym" to "change pseudonyms" -- that is, to
  4557. stop using any currently-dirty circuits for new streams, so we
  4558. don't link new actions to old actions. This also occurs on HUP
  4559. or "signal reload".
  4560. - If we would close a stream early (e.g. it asks for a .exit that
  4561. we know would refuse it) but the LeaveStreamsUnattached config
  4562. option is set by the controller, then don't close it.
  4563. - Add a new controller event type "authdir_newdescs" that allows
  4564. controllers to get all server descriptors that were uploaded to
  4565. a router in its role as directory authority.
  4566. - New controller option "getinfo desc/all-recent" to fetch the
  4567. latest server descriptor for every router that Tor knows about.
  4568. - Fix the controller's "attachstream 0" command to treat conn like
  4569. it just connected, doing address remapping, handling .exit and
  4570. .onion idioms, and so on. Now we're more uniform in making sure
  4571. that the controller hears about new and closing connections.
  4572. - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
  4573. the controller. Also, rotate dns and cpu workers if the controller
  4574. changes options that will affect them; and initialize the dns
  4575. worker cache tree whether or not we start out as a server.
  4576. - Add a new circuit purpose 'controller' to let the controller ask
  4577. for a circuit that Tor won't try to use. Extend the "extendcircuit"
  4578. controller command to let you specify the purpose if you're starting
  4579. a new circuit. Add a new "setcircuitpurpose" controller command to
  4580. let you change a circuit's purpose after it's been created.
  4581. - Let the controller ask for "getinfo dir/server/foo" so it can ask
  4582. directly rather than connecting to the dir port. "getinfo
  4583. dir/status/foo" also works, but currently only if your DirPort
  4584. is enabled.
  4585. - Let the controller tell us about certain router descriptors
  4586. that it doesn't want Tor to use in circuits. Implement
  4587. "setrouterpurpose" and modify "+postdescriptor" to do this.
  4588. - If the controller's *setconf commands fail, collect an error
  4589. message in a string and hand it back to the controller -- don't
  4590. just tell them to go read their logs.
  4591. o Scalability, resource management, and performance:
  4592. - Fix a major load balance bug: we were round-robin reading in 16 KB
  4593. chunks, and servers with bandwidthrate of 20 KB, while downloading
  4594. a 600 KB directory, would starve their other connections. Now we
  4595. try to be a bit more fair.
  4596. - Be more conservative about whether to advertise our DirPort.
  4597. The main change is to not advertise if we're running at capacity
  4598. and either a) we could hibernate ever or b) our capacity is low
  4599. and we're using a default DirPort.
  4600. - We weren't cannibalizing circuits correctly for
  4601. CIRCUIT_PURPOSE_C_ESTABLISH_REND and
  4602. CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
  4603. build those from scratch. This should make hidden services faster.
  4604. - Predict required circuits better, with an eye toward making hidden
  4605. services faster on the service end.
  4606. - Compress exit policies even more: look for duplicate lines and
  4607. remove them.
  4608. - Generate 18.0.0.0/8 address policy format in descs when we can;
  4609. warn when the mask is not reducible to a bit-prefix.
  4610. - There used to be two ways to specify your listening ports in a
  4611. server descriptor: on the "router" line and with a separate "ports"
  4612. line. Remove support for the "ports" line.
  4613. - Reduce memory requirements in our structs by changing the order
  4614. of fields. Replace balanced trees with hash tables. Inline
  4615. bottleneck smartlist functions. Add a "Map from digest to void*"
  4616. abstraction so we can do less hex encoding/decoding, and use it
  4617. in router_get_by_digest(). Many other CPU and memory improvements.
  4618. - Allow tor_gzip_uncompress to extract as much as possible from
  4619. truncated compressed data. Try to extract as many
  4620. descriptors as possible from truncated http responses (when
  4621. purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
  4622. - Make circ->onionskin a pointer, not a static array. moria2 was using
  4623. 125000 circuit_t's after it had been up for a few weeks, which
  4624. translates to 20+ megs of wasted space.
  4625. - The private half of our EDH handshake keys are now chosen out
  4626. of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
  4627. - Stop doing the complex voodoo overkill checking for insecure
  4628. Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
  4629. - Do round-robin writes for TLS of at most 16 kB per write. This
  4630. might be more fair on loaded Tor servers.
  4631. - Do not use unaligned memory access on alpha, mips, or mipsel.
  4632. It *works*, but is very slow, so we treat them as if it doesn't.
  4633. o Other bugfixes and improvements:
  4634. - Start storing useful information to $DATADIR/state, so we can
  4635. remember things across invocations of Tor. Retain unrecognized
  4636. lines so we can be forward-compatible, and write a TorVersion line
  4637. so we can be backward-compatible.
  4638. - If ORPort is set, Address is not explicitly set, and our hostname
  4639. resolves to a private IP address, try to use an interface address
  4640. if it has a public address. Now Windows machines that think of
  4641. themselves as localhost can guess their address.
  4642. - Regenerate our local descriptor if it's dirty and we try to use
  4643. it locally (e.g. if it changes during reachability detection).
  4644. This was causing some Tor servers to keep publishing the same
  4645. initial descriptor forever.
  4646. - Tor servers with dynamic IP addresses were needing to wait 18
  4647. hours before they could start doing reachability testing using
  4648. the new IP address and ports. This is because they were using
  4649. the internal descriptor to learn what to test, yet they were only
  4650. rebuilding the descriptor once they decided they were reachable.
  4651. - It turns out we couldn't bootstrap a network since we added
  4652. reachability detection in 0.1.0.1-rc. Good thing the Tor network
  4653. has never gone down. Add an AssumeReachable config option to let
  4654. servers and authorities bootstrap. When we're trying to build a
  4655. high-uptime or high-bandwidth circuit but there aren't enough
  4656. suitable servers, try being less picky rather than simply failing.
  4657. - Newly bootstrapped Tor networks couldn't establish hidden service
  4658. circuits until they had nodes with high uptime. Be more tolerant.
  4659. - Really busy servers were keeping enough circuits open on stable
  4660. connections that they were wrapping around the circuit_id
  4661. space. (It's only two bytes.) This exposed a bug where we would
  4662. feel free to reuse a circuit_id even if it still exists but has
  4663. been marked for close. Try to fix this bug. Some bug remains.
  4664. - When we fail to bind or listen on an incoming or outgoing
  4665. socket, we now close it before refusing, rather than just
  4666. leaking it. (Thanks to Peter Palfrader for finding.)
  4667. - Fix a file descriptor leak in start_daemon().
  4668. - On Windows, you can't always reopen a port right after you've
  4669. closed it. So change retry_listeners() to only close and re-open
  4670. ports that have changed.
  4671. - Workaround a problem with some http proxies that refuse GET
  4672. requests that specify "Content-Length: 0". Reported by Adrian.
  4673. - Recover better from TCP connections to Tor servers that are
  4674. broken but don't tell you (it happens!); and rotate TLS
  4675. connections once a week.
  4676. - Fix a scary-looking but apparently harmless bug where circuits
  4677. would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
  4678. servers, and never switch to state CIRCUIT_STATE_OPEN.
  4679. - Check for even more Windows version flags when writing the platform
  4680. string in server descriptors, and note any we don't recognize.
  4681. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
  4682. get a better idea of why their circuits failed. Not used yet.
  4683. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
  4684. We don't use them yet, but maybe one day our DNS resolver will be
  4685. able to discover them.
  4686. - Let people type "tor --install" as well as "tor -install" when they
  4687. want to make it an NT service.
  4688. - Looks like we were never delivering deflated (i.e. compressed)
  4689. running-routers lists, even when asked. Oops.
  4690. - We were leaking some memory every time the client changed IPs.
  4691. - Clean up more of the OpenSSL memory when exiting, so we can detect
  4692. memory leaks better.
  4693. - Never call free() on tor_malloc()d memory. This will help us
  4694. use dmalloc to detect memory leaks.
  4695. - Some Tor servers process billions of cells per day. These
  4696. statistics are now uint64_t's.
  4697. - Check [X-]Forwarded-For headers in HTTP requests when generating
  4698. log messages. This lets people run dirservers (and caches) behind
  4699. Apache but still know which IP addresses are causing warnings.
  4700. - Fix minor integer overflow in calculating when we expect to use up
  4701. our bandwidth allocation before hibernating.
  4702. - Lower the minimum required number of file descriptors to 1000,
  4703. so we can have some overhead for Valgrind on Linux, where the
  4704. default ulimit -n is 1024.
  4705. - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
  4706. and its existence is confusing some users.
  4707. o Config option fixes:
  4708. - Add a new config option ExitPolicyRejectPrivate which defaults
  4709. to on. Now all exit policies will begin with rejecting private
  4710. addresses, unless the server operator explicitly turns it off.
  4711. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
  4712. - Add new ReachableORAddresses and ReachableDirAddresses options
  4713. that understand address policies. FascistFirewall is now a synonym
  4714. for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
  4715. - Start calling it FooListenAddress rather than FooBindAddress,
  4716. since few of our users know what it means to bind an address
  4717. or port.
  4718. - If the user gave Tor an odd number of command-line arguments,
  4719. we were silently ignoring the last one. Now we complain and fail.
  4720. This wins the oldest-bug prize -- this bug has been present since
  4721. November 2002, as released in Tor 0.0.0.
  4722. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
  4723. torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
  4724. it would silently ignore the 6668.
  4725. - If we get a linelist or linelist_s config option from the torrc,
  4726. e.g. ExitPolicy, and it has no value, warn and skip rather than
  4727. silently resetting it to its default.
  4728. - Setconf was appending items to linelists, not clearing them.
  4729. - Add MyFamily to torrc.sample in the server section, so operators
  4730. will be more likely to learn that it exists.
  4731. - Make ContactInfo mandatory for authoritative directory servers.
  4732. - MaxConn has been obsolete for a while now. Document the ConnLimit
  4733. config option, which is a *minimum* number of file descriptors
  4734. that must be available else Tor refuses to start.
  4735. - Get rid of IgnoreVersion undocumented config option, and make us
  4736. only warn, never exit, when we're running an obsolete version.
  4737. - Make MonthlyAccountingStart config option truly obsolete now.
  4738. - Correct the man page entry on TrackHostExitsExpire.
  4739. - Let directory authorities start even if they don't specify an
  4740. Address config option.
  4741. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
  4742. reflect the updated flags in our v2 dir protocol.
  4743. o Config option features:
  4744. - Add a new config option FastFirstHopPK (on by default) so clients
  4745. do a trivial crypto handshake for their first hop, since TLS has
  4746. already taken care of confidentiality and authentication.
  4747. - Let the user set ControlListenAddress in the torrc. This can be
  4748. dangerous, but there are some cases (like a secured LAN) where it
  4749. makes sense.
  4750. - New config options to help controllers: FetchServerDescriptors
  4751. and FetchHidServDescriptors for whether to fetch server
  4752. info and hidserv info or let the controller do it, and
  4753. PublishServerDescriptor and PublishHidServDescriptors.
  4754. - Also let the controller set the __AllDirActionsPrivate config
  4755. option if you want all directory fetches/publishes to happen via
  4756. Tor (it assumes your controller bootstraps your circuits).
  4757. - Add "HardwareAccel" config option: support for crypto hardware
  4758. accelerators via OpenSSL. Off by default, until we find somebody
  4759. smart who can test it for us. (It appears to produce seg faults
  4760. in at least some cases.)
  4761. - New config option "AuthDirRejectUnlisted" for directory authorities
  4762. as a panic button: if we get flooded with unusable servers we can
  4763. revert to only listing servers in the approved-routers file.
  4764. - Directory authorities can now reject/invalidate by key and IP,
  4765. with the config options "AuthDirInvalid" and "AuthDirReject", or
  4766. by marking a fingerprint as "!reject" or "!invalid" (as its
  4767. nickname) in the approved-routers file. This is useful since
  4768. currently we automatically list servers as running and usable
  4769. even if we know they're jerks.
  4770. - Add a new config option TestSocks so people can see whether their
  4771. applications are using socks4, socks4a, socks5-with-ip, or
  4772. socks5-with-fqdn. This way they don't have to keep mucking
  4773. with tcpdump and wondering if something got cached somewhere.
  4774. - Add "private:*" as an alias in configuration for policies. Now
  4775. you can simplify your exit policy rather than needing to list
  4776. every single internal or nonroutable network space.
  4777. - Accept "private:*" in routerdesc exit policies; not generated yet
  4778. because older Tors do not understand it.
  4779. - Add configuration option "V1AuthoritativeDirectory 1" which
  4780. moria1, moria2, and tor26 have set.
  4781. - Implement an option, VirtualAddrMask, to set which addresses
  4782. get handed out in response to mapaddress requests. This works
  4783. around a bug in tsocks where 127.0.0.0/8 is never socksified.
  4784. - Add a new config option FetchUselessDescriptors, off by default,
  4785. for when you plan to run "exitlist" on your client and you want
  4786. to know about even the non-running descriptors.
  4787. - SocksTimeout: How long do we let a socks connection wait
  4788. unattached before we fail it?
  4789. - CircuitBuildTimeout: Cull non-open circuits that were born
  4790. at least this many seconds ago.
  4791. - CircuitIdleTimeout: Cull open clean circuits that were born
  4792. at least this many seconds ago.
  4793. - New config option SafeSocks to reject all application connections
  4794. using unsafe socks protocols. Defaults to off.
  4795. o Improved and clearer log messages:
  4796. - Reduce clutter in server logs. We're going to try to make
  4797. them actually usable now. New config option ProtocolWarnings that
  4798. lets you hear about how _other Tors_ are breaking the protocol. Off
  4799. by default.
  4800. - Divide log messages into logging domains. Once we put some sort
  4801. of interface on this, it will let people looking at more verbose
  4802. log levels specify the topics they want to hear more about.
  4803. - Log server fingerprint on startup, so new server operators don't
  4804. have to go hunting around their filesystem for it.
  4805. - Provide dire warnings to any users who set DirServer manually;
  4806. move it out of torrc.sample and into torrc.complete.
  4807. - Make the log message less scary when all the dirservers are
  4808. temporarily unreachable.
  4809. - When tor_socketpair() fails in Windows, give a reasonable
  4810. Windows-style errno back.
  4811. - Improve tor_gettimeofday() granularity on windows.
  4812. - We were printing the number of idle dns workers incorrectly when
  4813. culling them.
  4814. - Handle duplicate lines in approved-routers files without warning.
  4815. - We were whining about using socks4 or socks5-with-local-lookup
  4816. even when it's an IP address in the "virtual" range we designed
  4817. exactly for this case.
  4818. - Check for named servers when looking them up by nickname;
  4819. warn when we're calling a non-named server by its nickname;
  4820. don't warn twice about the same name.
  4821. - Downgrade the dirserver log messages when whining about
  4822. unreachability.
  4823. - Correct "your server is reachable" log entries to indicate that
  4824. it was self-testing that told us so.
  4825. - If we're trying to be a Tor server and running Windows 95/98/ME
  4826. as a server, explain that we'll likely crash.
  4827. - Provide a more useful warn message when our onion queue gets full:
  4828. the CPU is too slow or the exit policy is too liberal.
  4829. - Don't warn when we receive a 503 from a dirserver/cache -- this
  4830. will pave the way for them being able to refuse if they're busy.
  4831. - When we fail to bind a listener, try to provide a more useful
  4832. log message: e.g., "Is Tor already running?"
  4833. - Only start testing reachability once we've established a
  4834. circuit. This will make startup on dir authorities less noisy.
  4835. - Don't try to upload hidden service descriptors until we have
  4836. established a circuit.
  4837. - Tor didn't warn when it failed to open a log file.
  4838. - Warn when listening on a public address for socks. We suspect a
  4839. lot of people are setting themselves up as open socks proxies,
  4840. and they have no idea that jerks on the Internet are using them,
  4841. since they simply proxy the traffic into the Tor network.
  4842. - Give a useful message when people run Tor as the wrong user,
  4843. rather than telling them to start chowning random directories.
  4844. - Fix a harmless bug that was causing Tor servers to log
  4845. "Got an end because of misc error, but we're not an AP. Closing."
  4846. - Fix wrong log message when you add a "HiddenServiceNodes" config
  4847. line without any HiddenServiceDir line (reported by Chris Thomas).
  4848. - Directory authorities now stop whining so loudly about bad
  4849. descriptors that they fetch from other dirservers. So when there's
  4850. a log complaint, it's for sure from a freshly uploaded descriptor.
  4851. - When logging via syslog, include the pid whenever we provide
  4852. a log entry. Suggested by Todd Fries.
  4853. - When we're shutting down and we do something like try to post a
  4854. server descriptor or rendezvous descriptor, don't complain that
  4855. we seem to be unreachable. Of course we are, we're shutting down.
  4856. - Change log line for unreachability to explicitly suggest /etc/hosts
  4857. as the culprit. Also make it clearer what IP address and ports we're
  4858. testing for reachability.
  4859. - Put quotes around user-supplied strings when logging so users are
  4860. more likely to realize if they add bad characters (like quotes)
  4861. to the torrc.
  4862. - NT service patch from Matt Edman to improve error messages on Win32.
  4863. Changes in version 0.1.0.17 - 2006-02-17
  4864. o Crash bugfixes on 0.1.0.x:
  4865. - When servers with a non-zero DirPort came out of hibernation,
  4866. sometimes they would trigger an assert.
  4867. o Other important bugfixes:
  4868. - On platforms that don't have getrlimit (like Windows), we were
  4869. artificially constraining ourselves to a max of 1024
  4870. connections. Now just assume that we can handle as many as 15000
  4871. connections. Hopefully this won't cause other problems.
  4872. o Backported features:
  4873. - When we're a server, a client asks for an old-style directory,
  4874. and our write bucket is empty, don't give it to him. This way
  4875. small servers can continue to serve the directory *sometimes*,
  4876. without getting overloaded.
  4877. - Whenever you get a 503 in response to a directory fetch, try
  4878. once more. This will become important once servers start sending
  4879. 503's whenever they feel busy.
  4880. - Fetch a new directory every 120 minutes, not every 40 minutes.
  4881. Now that we have hundreds of thousands of users running the old
  4882. directory algorithm, it's starting to hurt a lot.
  4883. - Bump up the period for forcing a hidden service descriptor upload
  4884. from 20 minutes to 1 hour.
  4885. Changes in version 0.1.0.16 - 2006-01-02
  4886. o Crash bugfixes on 0.1.0.x:
  4887. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  4888. corrupting the heap, losing FDs, or crashing when we need to resize
  4889. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  4890. - It turns out sparc64 platforms crash on unaligned memory access
  4891. too -- so detect and avoid this.
  4892. - Handle truncated compressed data correctly (by detecting it and
  4893. giving an error).
  4894. - Fix possible-but-unlikely free(NULL) in control.c.
  4895. - When we were closing connections, there was a rare case that
  4896. stomped on memory, triggering seg faults and asserts.
  4897. - Avoid potential infinite recursion when building a descriptor. (We
  4898. don't know that it ever happened, but better to fix it anyway.)
  4899. - We were neglecting to unlink marked circuits from soon-to-close OR
  4900. connections, which caused some rare scribbling on freed memory.
  4901. - Fix a memory stomping race bug when closing the joining point of two
  4902. rendezvous circuits.
  4903. - Fix an assert in time parsing found by Steven Murdoch.
  4904. o Other bugfixes on 0.1.0.x:
  4905. - When we're doing reachability testing, provide more useful log
  4906. messages so the operator knows what to expect.
  4907. - Do not check whether DirPort is reachable when we are suppressing
  4908. advertising it because of hibernation.
  4909. - When building with -static or on Solaris, we sometimes needed -ldl.
  4910. - One of the dirservers (tor26) changed its IP address.
  4911. - When we're deciding whether a stream has enough circuits around
  4912. that can handle it, count the freshly dirty ones and not the ones
  4913. that are so dirty they won't be able to handle it.
  4914. - When we're expiring old circuits, we had a logic error that caused
  4915. us to close new rendezvous circuits rather than old ones.
  4916. - Give a more helpful log message when you try to change ORPort via
  4917. the controller: you should upgrade Tor if you want that to work.
  4918. - We were failing to parse Tor versions that start with "Tor ".
  4919. - Tolerate faulty streams better: when a stream fails for reason
  4920. exitpolicy, stop assuming that the router is lying about his exit
  4921. policy. When a stream fails for reason misc, allow it to retry just
  4922. as if it was resolvefailed. When a stream has failed three times,
  4923. reset its failure count so we can try again and get all three tries.
  4924. Changes in version 0.1.0.15 - 2005-09-23
  4925. o Bugfixes on 0.1.0.x:
  4926. - Reject ports 465 and 587 (spam targets) in default exit policy.
  4927. - Don't crash when we don't have any spare file descriptors and we
  4928. try to spawn a dns or cpu worker.
  4929. - Get rid of IgnoreVersion undocumented config option, and make us
  4930. only warn, never exit, when we're running an obsolete version.
  4931. - Don't try to print a null string when your server finds itself to
  4932. be unreachable and the Address config option is empty.
  4933. - Make the numbers in read-history and write-history into uint64s,
  4934. so they don't overflow and publish negatives in the descriptor.
  4935. - Fix a minor memory leak in smartlist_string_remove().
  4936. - We were only allowing ourselves to upload a server descriptor at
  4937. most every 20 minutes, even if it changed earlier than that.
  4938. - Clean up log entries that pointed to old URLs.
  4939. Changes in version 0.1.0.14 - 2005-08-08
  4940. o Bugfixes on 0.1.0.x:
  4941. - Fix the other half of the bug with crypto handshakes
  4942. (CVE-2005-2643).
  4943. - Fix an assert trigger if you send a 'signal term' via the
  4944. controller when it's listening for 'event info' messages.
  4945. Changes in version 0.1.0.13 - 2005-08-04
  4946. o Bugfixes on 0.1.0.x:
  4947. - Fix a critical bug in the security of our crypto handshakes.
  4948. - Fix a size_t underflow in smartlist_join_strings2() that made
  4949. it do bad things when you hand it an empty smartlist.
  4950. - Fix Windows installer to ship Tor license (thanks to Aphex for
  4951. pointing out this oversight) and put a link to the doc directory
  4952. in the start menu.
  4953. - Explicitly set no-unaligned-access for sparc: it turns out the
  4954. new gcc's let you compile broken code, but that doesn't make it
  4955. not-broken.
  4956. Changes in version 0.1.0.12 - 2005-07-18
  4957. o New directory servers:
  4958. - tor26 has changed IP address.
  4959. o Bugfixes on 0.1.0.x:
  4960. - Fix a possible double-free in tor_gzip_uncompress().
  4961. - When --disable-threads is set, do not search for or link against
  4962. pthreads libraries.
  4963. - Don't trigger an assert if an authoritative directory server
  4964. claims its dirport is 0.
  4965. - Fix bug with removing Tor as an NT service: some people were
  4966. getting "The service did not return an error." Thanks to Matt
  4967. Edman for the fix.
  4968. Changes in version 0.1.0.11 - 2005-06-30
  4969. o Bugfixes on 0.1.0.x:
  4970. - Fix major security bug: servers were disregarding their
  4971. exit policies if clients behaved unexpectedly.
  4972. - Make OS X init script check for missing argument, so we don't
  4973. confuse users who invoke it incorrectly.
  4974. - Fix a seg fault in "tor --hash-password foo".
  4975. - The MAPADDRESS control command was broken.
  4976. Changes in version 0.1.0.10 - 2005-06-14
  4977. o Fixes on Win32:
  4978. - Make NT services work and start on startup on Win32 (based on
  4979. patch by Matt Edman). See the FAQ entry for details.
  4980. - Make 'platform' string in descriptor more accurate for Win32
  4981. servers, so it's not just "unknown platform".
  4982. - REUSEADDR on normal platforms means you can rebind to the port
  4983. right after somebody else has let it go. But REUSEADDR on Win32
  4984. means you can bind to the port _even when somebody else already
  4985. has it bound_! So, don't do that on Win32.
  4986. - Clean up the log messages when starting on Win32 with no config
  4987. file.
  4988. - Allow seeding the RNG on Win32 even when you're not running as
  4989. Administrator. If seeding the RNG on Win32 fails, quit.
  4990. o Assert / crash bugs:
  4991. - Refuse relay cells that claim to have a length larger than the
  4992. maximum allowed. This prevents a potential attack that could read
  4993. arbitrary memory (e.g. keys) from an exit server's process
  4994. (CVE-2005-2050).
  4995. - If unofficial Tor clients connect and send weird TLS certs, our
  4996. Tor server triggers an assert. Stop asserting, and start handling
  4997. TLS errors better in other situations too.
  4998. - Fix a race condition that can trigger an assert when we have a
  4999. pending create cell and an OR connection attempt fails.
  5000. o Resource leaks:
  5001. - Use pthreads for worker processes rather than forking. This was
  5002. forced because when we forked, we ended up wasting a lot of
  5003. duplicate ram over time.
  5004. - Also switch to foo_r versions of some library calls to allow
  5005. reentry and threadsafeness.
  5006. - Implement --disable-threads configure option. Disable threads on
  5007. netbsd and openbsd by default, because they have no reentrant
  5008. resolver functions (!), and on solaris since it has other
  5009. threading issues.
  5010. - Fix possible bug on threading platforms (e.g. win32) which was
  5011. leaking a file descriptor whenever a cpuworker or dnsworker died.
  5012. - Fix a minor memory leak when somebody establishes an introduction
  5013. point at your Tor server.
  5014. - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
  5015. Adam Langley.)
  5016. - Add ./configure --with-dmalloc option, to track memory leaks.
  5017. - And try to free all memory on closing, so we can detect what
  5018. we're leaking.
  5019. o Protocol correctness:
  5020. - When we've connected to an OR and handshaked but didn't like
  5021. the result, we were closing the conn without sending destroy
  5022. cells back for pending circuits. Now send those destroys.
  5023. - Start sending 'truncated' cells back rather than destroy cells
  5024. if the circuit closes in front of you. This means we won't have
  5025. to abandon partially built circuits.
  5026. - Handle changed router status correctly when dirserver reloads
  5027. fingerprint file. We used to be dropping all unverified descriptors
  5028. right then. The bug was hidden because we would immediately
  5029. fetch a directory from another dirserver, which would include the
  5030. descriptors we just dropped.
  5031. - Revise tor-spec to add more/better stream end reasons.
  5032. - Revise all calls to connection_edge_end to avoid sending 'misc',
  5033. and to take errno into account where possible.
  5034. - Client now retries when streams end early for 'hibernating' or
  5035. 'resource limit' reasons, rather than failing them.
  5036. - Try to be more zealous about calling connection_edge_end when
  5037. things go bad with edge conns in connection.c.
  5038. o Robustness improvements:
  5039. - Better handling for heterogeneous / unreliable nodes:
  5040. - Annotate circuits with whether they aim to contain high uptime
  5041. nodes and/or high capacity nodes. When building circuits, choose
  5042. appropriate nodes.
  5043. - This means that every single node in an intro rend circuit,
  5044. not just the last one, will have a minimum uptime.
  5045. - New config option LongLivedPorts to indicate application streams
  5046. that will want high uptime circuits.
  5047. - Servers reset uptime when a dir fetch entirely fails. This
  5048. hopefully reflects stability of the server's network connectivity.
  5049. - If somebody starts his tor server in Jan 2004 and then fixes his
  5050. clock, don't make his published uptime be a year.
  5051. - Reset published uptime when we wake up from hibernation.
  5052. - Introduce a notion of 'internal' circs, which are chosen without
  5053. regard to the exit policy of the last hop. Intro and rendezvous
  5054. circs must be internal circs, to avoid leaking information. Resolve
  5055. and connect streams can use internal circs if they want.
  5056. - New circuit pooling algorithm: keep track of what destination ports
  5057. we've used recently (start out assuming we'll want to use 80), and
  5058. make sure to have enough circs around to satisfy these ports. Also
  5059. make sure to have 2 internal circs around if we've required internal
  5060. circs lately (and with high uptime if we've seen that lately too).
  5061. - Turn addr_policy_compare from a tristate to a quadstate; this should
  5062. help address our "Ah, you allow 1.2.3.4:80. You are a good choice
  5063. for google.com" problem.
  5064. - When a client asks us for a dir mirror and we don't have one,
  5065. launch an attempt to get a fresh one.
  5066. - First cut at support for "create-fast" cells. Clients can use
  5067. these when extending to their first hop, since the TLS already
  5068. provides forward secrecy and authentication. Not enabled on
  5069. clients yet.
  5070. o Reachability testing.
  5071. - Your Tor server will automatically try to see if its ORPort and
  5072. DirPort are reachable from the outside, and it won't upload its
  5073. descriptor until it decides at least ORPort is reachable (when
  5074. DirPort is not yet found reachable, publish it as zero).
  5075. - When building testing circs for ORPort testing, use only
  5076. high-bandwidth nodes, so fewer circuits fail.
  5077. - Notice when our IP changes, and reset stats/uptime/reachability.
  5078. - Authdirservers don't do ORPort reachability detection, since
  5079. they're in clique mode, so it will be rare to find a server not
  5080. already connected to them.
  5081. - Authdirservers now automatically approve nodes running 0.1.0.2-rc
  5082. or later.
  5083. o Dirserver fixes:
  5084. - Now we allow two unverified servers with the same nickname
  5085. but different keys. But if a nickname is verified, only that
  5086. nickname+key are allowed.
  5087. - If you're an authdirserver connecting to an address:port,
  5088. and it's not the OR you were expecting, forget about that
  5089. descriptor. If he *was* the one you were expecting, then forget
  5090. about all other descriptors for that address:port.
  5091. - Allow servers to publish descriptors from 12 hours in the future.
  5092. Corollary: only whine about clock skew from the dirserver if
  5093. he's a trusted dirserver (since now even verified servers could
  5094. have quite wrong clocks).
  5095. - Require servers that use the default dirservers to have public IP
  5096. addresses. We have too many servers that are configured with private
  5097. IPs and their admins never notice the log entries complaining that
  5098. their descriptors are being rejected.
  5099. o Efficiency improvements:
  5100. - Use libevent. Now we can use faster async cores (like epoll, kpoll,
  5101. and /dev/poll), and hopefully work better on Windows too.
  5102. - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
  5103. kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
  5104. - Find libevent even if it's hiding in /usr/local/ and your
  5105. CFLAGS and LDFLAGS don't tell you to look there.
  5106. - Be able to link with libevent as a shared library (the default
  5107. after 1.0d), even if it's hiding in /usr/local/lib and even
  5108. if you haven't added /usr/local/lib to your /etc/ld.so.conf,
  5109. assuming you're running gcc. Otherwise fail and give a useful
  5110. error message.
  5111. - Switch to a new buffer management algorithm, which tries to avoid
  5112. reallocing and copying quite as much. In first tests it looks like
  5113. it uses *more* memory on average, but less cpu.
  5114. - Switch our internal buffers implementation to use a ring buffer,
  5115. to hopefully improve performance for fast servers a lot.
  5116. - Reenable the part of the code that tries to flush as soon as an
  5117. OR outbuf has a full TLS record available. Perhaps this will make
  5118. OR outbufs not grow as huge except in rare cases, thus saving lots
  5119. of CPU time plus memory.
  5120. - Improve performance for dirservers: stop re-parsing the whole
  5121. directory every time you regenerate it.
  5122. - Keep a big splay tree of (circid,orconn)->circuit mappings to make
  5123. it much faster to look up a circuit for each relay cell.
  5124. - Remove most calls to assert_all_pending_dns_resolves_ok(),
  5125. since they're eating our cpu on exit nodes.
  5126. - Stop wasting time doing a case insensitive comparison for every
  5127. dns name every time we do any lookup. Canonicalize the names to
  5128. lowercase when you first see them.
  5129. o Hidden services:
  5130. - Handle unavailable hidden services better. Handle slow or busy
  5131. hidden services better.
  5132. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
  5133. circ as necessary, if there are any completed ones lying around
  5134. when we try to launch one.
  5135. - Make hidden services try to establish a rendezvous for 30 seconds
  5136. after fetching the descriptor, rather than for n (where n=3)
  5137. attempts to build a circuit.
  5138. - Adjust maximum skew and age for rendezvous descriptors: let skew
  5139. be 48 hours rather than 90 minutes.
  5140. - Reject malformed .onion addresses rather then passing them on as
  5141. normal web requests.
  5142. o Controller:
  5143. - More Tor controller support. See
  5144. http://tor.eff.org/doc/control-spec.txt for all the new features,
  5145. including signals to emulate unix signals from any platform;
  5146. redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
  5147. closestream; closecircuit; etc.
  5148. - Encode hashed controller passwords in hex instead of base64,
  5149. to make it easier to write controllers.
  5150. - Revise control spec and implementation to allow all log messages to
  5151. be sent to controller with their severities intact (suggested by
  5152. Matt Edman). Disable debug-level logs while delivering a debug-level
  5153. log to the controller, to prevent loop. Update TorControl to handle
  5154. new log event types.
  5155. o New config options/defaults:
  5156. - Begin scrubbing sensitive strings from logs by default. Turn off
  5157. the config option SafeLogging if you need to do debugging.
  5158. - New exit policy: accept most low-numbered ports, rather than
  5159. rejecting most low-numbered ports.
  5160. - Put a note in the torrc about abuse potential with the default
  5161. exit policy.
  5162. - Add support for CONNECTing through https proxies, with "HttpsProxy"
  5163. config option.
  5164. - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
  5165. based on patch from Adam Langley (basic auth only).
  5166. - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
  5167. the fast servers that have been joining lately. (Clients are now
  5168. willing to load balance over up to 2 MB of advertised bandwidth
  5169. capacity too.)
  5170. - New config option MaxAdvertisedBandwidth which lets you advertise
  5171. a low bandwidthrate (to not attract as many circuits) while still
  5172. allowing a higher bandwidthrate in reality.
  5173. - Require BandwidthRate to be at least 20kB/s for servers.
  5174. - Add a NoPublish config option, so you can be a server (e.g. for
  5175. testing running Tor servers in other Tor networks) without
  5176. publishing your descriptor to the primary dirservers.
  5177. - Add a new AddressMap config directive to rewrite incoming socks
  5178. addresses. This lets you, for example, declare an implicit
  5179. required exit node for certain sites.
  5180. - Add a new TrackHostExits config directive to trigger addressmaps
  5181. for certain incoming socks addresses -- for sites that break when
  5182. your exit keeps changing (based on patch from Mike Perry).
  5183. - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
  5184. which describes how often we retry making new circuits if current
  5185. ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
  5186. how long we're willing to make use of an already-dirty circuit.
  5187. - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
  5188. a config option "ShutdownWaitLength" (when using kill -INT on
  5189. servers).
  5190. - Fix an edge case in parsing config options: if they say "--"
  5191. on the commandline, it's not a config option (thanks weasel).
  5192. - New config option DirAllowPrivateAddresses for authdirservers.
  5193. Now by default they refuse router descriptors that have non-IP or
  5194. private-IP addresses.
  5195. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
  5196. smart" default value: low for servers and high for clients.
  5197. - Some people were putting "Address " in their torrc, and they had
  5198. a buggy resolver that resolved " " to 0.0.0.0. Oops.
  5199. - If DataDir is ~/.tor, and that expands to /.tor, then default to
  5200. LOCALSTATEDIR/tor instead.
  5201. - Implement --verify-config command-line option to check if your torrc
  5202. is valid without actually launching Tor.
  5203. o Logging improvements:
  5204. - When dirservers refuse a server descriptor, we now log its
  5205. contactinfo, platform, and the poster's IP address.
  5206. - Only warn once per nickname from add_nickname_list_to_smartlist()
  5207. per failure, so an entrynode or exitnode choice that's down won't
  5208. yell so much.
  5209. - When we're connecting to an OR and he's got a different nickname/key
  5210. than we were expecting, only complain loudly if we're an OP or a
  5211. dirserver. Complaining loudly to the OR admins just confuses them.
  5212. - Whine at you if you're a server and you don't set your contactinfo.
  5213. - Warn when exit policy implicitly allows local addresses.
  5214. - Give a better warning when some other server advertises an
  5215. ORPort that is actually an apache running ssl.
  5216. - If we get an incredibly skewed timestamp from a dirserver mirror
  5217. that isn't a verified OR, don't warn -- it's probably him that's
  5218. wrong.
  5219. - When a dirserver causes you to give a warn, mention which dirserver
  5220. it was.
  5221. - Initialize libevent later in the startup process, so the logs are
  5222. already established by the time we start logging libevent warns.
  5223. - Use correct errno on win32 if libevent fails.
  5224. - Check and warn about known-bad/slow libevent versions.
  5225. - Stop warning about sigpipes in the logs. We're going to
  5226. pretend that getting these occassionally is normal and fine.
  5227. o New contrib scripts:
  5228. - New experimental script tor/contrib/exitlist: a simple python
  5229. script to parse directories and find Tor nodes that exit to listed
  5230. addresses/ports.
  5231. - New experimental script tor/contrib/ExerciseServer.py (needs more
  5232. work) that uses the controller interface to build circuits and
  5233. fetch pages over them. This will help us bootstrap servers that
  5234. have lots of capacity but haven't noticed it yet.
  5235. - New experimental script tor/contrib/PathDemo.py (needs more work)
  5236. that uses the controller interface to let you choose whole paths
  5237. via addresses like
  5238. "<hostname>.<path,separated by dots>.<length of path>.path"
  5239. - New contributed script "privoxy-tor-toggle" to toggle whether
  5240. Privoxy uses Tor. Seems to be configured for Debian by default.
  5241. - Have torctl.in/tor.sh.in check for location of su binary (needed
  5242. on FreeBSD)
  5243. o Misc bugfixes:
  5244. - chdir() to your datadirectory at the *end* of the daemonize process,
  5245. not the beginning. This was a problem because the first time you
  5246. run tor, if your datadir isn't there, and you have runasdaemon set
  5247. to 1, it will try to chdir to it before it tries to create it. Oops.
  5248. - Fix several double-mark-for-close bugs, e.g. where we were finding
  5249. a conn for a cell even if that conn is already marked for close.
  5250. - Stop most cases of hanging up on a socks connection without sending
  5251. the socks reject.
  5252. - Fix a bug in the RPM package: set home directory for _tor to
  5253. something more reasonable when first installing.
  5254. - Stop putting nodename in the Platform string in server descriptors.
  5255. It doesn't actually help, and it is confusing/upsetting some people.
  5256. - When using preferred entry or exit nodes, ignore whether the
  5257. circuit wants uptime or capacity. They asked for the nodes, they
  5258. get the nodes.
  5259. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
  5260. artificially capped at 500kB.
  5261. - Cache local dns resolves correctly even when they're .exit
  5262. addresses.
  5263. - If we're hibernating and we get a SIGINT, exit immediately.
  5264. - tor-resolve requests were ignoring .exit if there was a working circuit
  5265. they could use instead.
  5266. - Pay more attention to the ClientOnly config option.
  5267. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
  5268. installer screens; and don't put stuff into StartupItems unless
  5269. the user asks you to.
  5270. o Misc features:
  5271. - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
  5272. rather than just rejecting it.
  5273. - If our clock jumps forward by 100 seconds or more, assume something
  5274. has gone wrong with our network and abandon all not-yet-used circs.
  5275. - When an application is using socks5, give him the whole variety of
  5276. potential socks5 responses (connect refused, host unreachable, etc),
  5277. rather than just "success" or "failure".
  5278. - A more sane version numbering system. See
  5279. http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
  5280. - Change version parsing logic: a version is "obsolete" if it is not
  5281. recommended and (1) there is a newer recommended version in the
  5282. same series, or (2) there are no recommended versions in the same
  5283. series, but there are some recommended versions in a newer series.
  5284. A version is "new" if it is newer than any recommended version in
  5285. the same series.
  5286. - Report HTTP reasons to client when getting a response from directory
  5287. servers -- so you can actually know what went wrong.
  5288. - Reject odd-looking addresses at the client (e.g. addresses that
  5289. contain a colon), rather than having the server drop them because
  5290. they're malformed.
  5291. - Stop publishing socksport in the directory, since it's not
  5292. actually meant to be public. For compatibility, publish a 0 there
  5293. for now.
  5294. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
  5295. cookies to disk and doesn't log each web request to disk. (Thanks
  5296. to Brett Carrington for pointing this out.)
  5297. - Add OSX uninstall instructions. An actual uninstall script will
  5298. come later.
  5299. - Add "opt hibernating 1" to server descriptor to make it clearer
  5300. whether the server is hibernating.
  5301. Changes in version 0.0.9.10 - 2005-06-16
  5302. o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
  5303. - Refuse relay cells that claim to have a length larger than the
  5304. maximum allowed. This prevents a potential attack that could read
  5305. arbitrary memory (e.g. keys) from an exit server's process
  5306. (CVE-2005-2050).
  5307. Changes in version 0.0.9.9 - 2005-04-23
  5308. o Bugfixes on 0.0.9.x:
  5309. - If unofficial Tor clients connect and send weird TLS certs, our
  5310. Tor server triggers an assert. This release contains a minimal
  5311. backport from the broader fix that we put into 0.1.0.4-rc.
  5312. Changes in version 0.0.9.8 - 2005-04-07
  5313. o Bugfixes on 0.0.9.x:
  5314. - We have a bug that I haven't found yet. Sometimes, very rarely,
  5315. cpuworkers get stuck in the 'busy' state, even though the cpuworker
  5316. thinks of itself as idle. This meant that no new circuits ever got
  5317. established. Here's a workaround to kill any cpuworker that's been
  5318. busy for more than 100 seconds.
  5319. Changes in version 0.0.9.7 - 2005-04-01
  5320. o Bugfixes on 0.0.9.x:
  5321. - Fix another race crash bug (thanks to Glenn Fink for reporting).
  5322. - Compare identity to identity, not to nickname, when extending to
  5323. a router not already in the directory. This was preventing us from
  5324. extending to unknown routers. Oops.
  5325. - Make sure to create OS X Tor user in <500 range, so we aren't
  5326. creating actual system users.
  5327. - Note where connection-that-hasn't-sent-end was marked, and fix
  5328. a few really loud instances of this harmless bug (it's fixed more
  5329. in 0.1.0.x).
  5330. Changes in version 0.0.9.6 - 2005-03-24
  5331. o Bugfixes on 0.0.9.x (crashes and asserts):
  5332. - Add new end stream reasons to maintainance branch. Fix bug where
  5333. reason (8) could trigger an assert. Prevent bug from recurring.
  5334. - Apparently win32 stat wants paths to not end with a slash.
  5335. - Fix assert triggers in assert_cpath_layer_ok(), where we were
  5336. blowing away the circuit that conn->cpath_layer points to, then
  5337. checking to see if the circ is well-formed. Backport check to make
  5338. sure we dont use the cpath on a closed connection.
  5339. - Prevent circuit_resume_edge_reading_helper() from trying to package
  5340. inbufs for marked-for-close streams.
  5341. - Don't crash on hup if your options->address has become unresolvable.
  5342. - Some systems (like OS X) sometimes accept() a connection and tell
  5343. you the remote host is 0.0.0.0:0. If this happens, due to some
  5344. other mis-features, we get confused; so refuse the conn for now.
  5345. o Bugfixes on 0.0.9.x (other):
  5346. - Fix harmless but scary "Unrecognized content encoding" warn message.
  5347. - Add new stream error reason: TORPROTOCOL reason means "you are not
  5348. speaking a version of Tor I understand; say bye-bye to your stream."
  5349. - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
  5350. into the future, now that we are more tolerant of skew. This
  5351. resolves a bug where a Tor server would refuse to cache a directory
  5352. because all the directories it gets are too far in the future;
  5353. yet the Tor server never logs any complaints about clock skew.
  5354. - Mac packaging magic: make man pages useable, and do not overwrite
  5355. existing torrc files.
  5356. - Make OS X log happily to /var/log/tor/tor.log
  5357. Changes in version 0.0.9.5 - 2005-02-22
  5358. o Bugfixes on 0.0.9.x:
  5359. - Fix an assert race at exit nodes when resolve requests fail.
  5360. - Stop picking unverified dir mirrors--it only leads to misery.
  5361. - Patch from Matt Edman to make NT services work better. Service
  5362. support is still not compiled into the executable by default.
  5363. - Patch from Dmitri Bely so the Tor service runs better under
  5364. the win32 SYSTEM account.
  5365. - Make tor-resolve actually work (?) on Win32.
  5366. - Fix a sign bug when getrlimit claims to have 4+ billion
  5367. file descriptors available.
  5368. - Stop refusing to start when bandwidthburst == bandwidthrate.
  5369. - When create cells have been on the onion queue more than five
  5370. seconds, just send back a destroy and take them off the list.
  5371. Changes in version 0.0.9.4 - 2005-02-03
  5372. o Bugfixes on 0.0.9:
  5373. - Fix an assert bug that took down most of our servers: when
  5374. a server claims to have 1 GB of bandwidthburst, don't
  5375. freak out.
  5376. - Don't crash as badly if we have spawned the max allowed number
  5377. of dnsworkers, or we're out of file descriptors.
  5378. - Block more file-sharing ports in the default exit policy.
  5379. - MaxConn is now automatically set to the hard limit of max
  5380. file descriptors we're allowed (ulimit -n), minus a few for
  5381. logs, etc.
  5382. - Give a clearer message when servers need to raise their
  5383. ulimit -n when they start running out of file descriptors.
  5384. - SGI Compatibility patches from Jan Schaumann.
  5385. - Tolerate a corrupt cached directory better.
  5386. - When a dirserver hasn't approved your server, list which one.
  5387. - Go into soft hibernation after 95% of the bandwidth is used,
  5388. not 99%. This is especially important for daily hibernators who
  5389. have a small accounting max. Hopefully it will result in fewer
  5390. cut connections when the hard hibernation starts.
  5391. - Load-balance better when using servers that claim more than
  5392. 800kB/s of capacity.
  5393. - Make NT services work (experimental, only used if compiled in).
  5394. Changes in version 0.0.9.3 - 2005-01-21
  5395. o Bugfixes on 0.0.9:
  5396. - Backport the cpu use fixes from main branch, so busy servers won't
  5397. need as much processor time.
  5398. - Work better when we go offline and then come back, or when we
  5399. run Tor at boot before the network is up. We do this by
  5400. optimistically trying to fetch a new directory whenever an
  5401. application request comes in and we think we're offline -- the
  5402. human is hopefully a good measure of when the network is back.
  5403. - Backport some minimal hidserv bugfixes: keep rend circuits open as
  5404. long as you keep using them; actually publish hidserv descriptors
  5405. shortly after they change, rather than waiting 20-40 minutes.
  5406. - Enable Mac startup script by default.
  5407. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
  5408. - When you update AllowUnverifiedNodes or FirewallPorts via the
  5409. controller's setconf feature, we were always appending, never
  5410. resetting.
  5411. - When you update HiddenServiceDir via setconf, it was screwing up
  5412. the order of reading the lines, making it fail.
  5413. - Do not rewrite a cached directory back to the cache; otherwise we
  5414. will think it is recent and not fetch a newer one on startup.
  5415. - Workaround for webservers that lie about Content-Encoding: Tor
  5416. now tries to autodetect compressed directories and compression
  5417. itself. This lets us Proxypass dir fetches through apache.
  5418. Changes in version 0.0.9.2 - 2005-01-04
  5419. o Bugfixes on 0.0.9 (crashes and asserts):
  5420. - Fix an assert on startup when the disk is full and you're logging
  5421. to a file.
  5422. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
  5423. style address, then we'd crash.
  5424. - Fix an assert trigger when the running-routers string we get from
  5425. a dirserver is broken.
  5426. - Make worker threads start and run on win32. Now win32 servers
  5427. may work better.
  5428. - Bandaid (not actually fix, but now it doesn't crash) an assert
  5429. where the dns worker dies mysteriously and the main Tor process
  5430. doesn't remember anything about the address it was resolving.
  5431. o Bugfixes on 0.0.9 (Win32):
  5432. - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
  5433. name out of the warning/assert messages.
  5434. - Fix a superficial "unhandled error on read" bug on win32.
  5435. - The win32 installer no longer requires a click-through for our
  5436. license, since our Free Software license grants rights but does not
  5437. take any away.
  5438. - Win32: When connecting to a dirserver fails, try another one
  5439. immediately. (This was already working for non-win32 Tors.)
  5440. - Stop trying to parse $HOME on win32 when hunting for default
  5441. DataDirectory.
  5442. - Make tor-resolve.c work on win32 by calling network_init().
  5443. o Bugfixes on 0.0.9 (other):
  5444. - Make 0.0.9.x build on Solaris again.
  5445. - Due to a fencepost error, we were blowing away the \n when reporting
  5446. confvalue items in the controller. So asking for multiple config
  5447. values at once couldn't work.
  5448. - When listing circuits that are pending on an opening OR connection,
  5449. if we're an OR we were listing circuits that *end* at us as
  5450. being pending on every listener, dns/cpu worker, etc. Stop that.
  5451. - Dirservers were failing to create 'running-routers' or 'directory'
  5452. strings if we had more than some threshold of routers. Fix them so
  5453. they can handle any number of routers.
  5454. - Fix a superficial "Duplicate mark for close" bug.
  5455. - Stop checking for clock skew for OR connections, even for servers.
  5456. - Fix a fencepost error that was chopping off the last letter of any
  5457. nickname that is the maximum allowed nickname length.
  5458. - Update URLs in log messages so they point to the new website.
  5459. - Fix a potential problem in mangling server private keys while
  5460. writing to disk (not triggered yet, as far as we know).
  5461. - Include the licenses for other free software we include in Tor,
  5462. now that we're shipping binary distributions more regularly.
  5463. Changes in version 0.0.9.1 - 2004-12-15
  5464. o Bugfixes on 0.0.9:
  5465. - Make hibernation actually work.
  5466. - Make HashedControlPassword config option work.
  5467. - When we're reporting event circuit status to a controller,
  5468. don't use the stream status code.
  5469. Changes in version 0.0.9 - 2004-12-12
  5470. o Bugfixes on 0.0.8.1 (Crashes and asserts):
  5471. - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
  5472. write() call will fail and we handle it there.
  5473. - When we run out of disk space, or other log writing error, don't
  5474. crash. Just stop logging to that log and continue.
  5475. - Fix isspace() and friends so they still make Solaris happy
  5476. but also so they don't trigger asserts on win32.
  5477. - Fix assert failure on malformed socks4a requests.
  5478. - Fix an assert bug where a hidden service provider would fail if
  5479. the first hop of his rendezvous circuit was down.
  5480. - Better handling of size_t vs int, so we're more robust on 64
  5481. bit platforms.
  5482. o Bugfixes on 0.0.8.1 (Win32):
  5483. - Make windows sockets actually non-blocking (oops), and handle
  5484. win32 socket errors better.
  5485. - Fix parse_iso_time on platforms without strptime (eg win32).
  5486. - win32: when being multithreaded, leave parent fdarray open.
  5487. - Better handling of winsock includes on non-MSV win32 compilers.
  5488. - Change our file IO stuff (especially wrt OpenSSL) so win32 is
  5489. happier.
  5490. - Make unit tests work on win32.
  5491. o Bugfixes on 0.0.8.1 (Path selection and streams):
  5492. - Calculate timeout for waiting for a connected cell from the time
  5493. we sent the begin cell, not from the time the stream started. If
  5494. it took a long time to establish the circuit, we would time out
  5495. right after sending the begin cell.
  5496. - Fix router_compare_addr_to_addr_policy: it was not treating a port
  5497. of * as always matching, so we were picking reject *:* nodes as
  5498. exit nodes too. Oops.
  5499. - When read() failed on a stream, we would close it without sending
  5500. back an end. So 'connection refused' would simply be ignored and
  5501. the user would get no response.
  5502. - Stop a sigpipe: when an 'end' cell races with eof from the app,
  5503. we shouldn't hold-open-until-flush if the eof arrived first.
  5504. - Let resolve conns retry/expire also, rather than sticking around
  5505. forever.
  5506. - Fix more dns related bugs: send back resolve_failed and end cells
  5507. more reliably when the resolve fails, rather than closing the
  5508. circuit and then trying to send the cell. Also attach dummy resolve
  5509. connections to a circuit *before* calling dns_resolve(), to fix
  5510. a bug where cached answers would never be sent in RESOLVED cells.
  5511. o Bugfixes on 0.0.8.1 (Circuits):
  5512. - Finally fix a bug that's been plaguing us for a year:
  5513. With high load, circuit package window was reaching 0. Whenever
  5514. we got a circuit-level sendme, we were reading a lot on each
  5515. socket, but only writing out a bit. So we would eventually reach
  5516. eof. This would be noticed and acted on even when there were still
  5517. bytes sitting in the inbuf.
  5518. - Use identity comparison, not nickname comparison, to choose which
  5519. half of circuit-ID-space each side gets to use. This is needed
  5520. because sometimes we think of a router as a nickname, and sometimes
  5521. as a hex ID, and we can't predict what the other side will do.
  5522. o Bugfixes on 0.0.8.1 (Other):
  5523. - Fix a whole slew of memory leaks.
  5524. - Disallow NDEBUG. We don't ever want anybody to turn off debug.
  5525. - If we are using select, make sure we stay within FD_SETSIZE.
  5526. - When poll() is interrupted, we shouldn't believe the revents values.
  5527. - Add a FAST_SMARTLIST define to optionally inline smartlist_get
  5528. and smartlist_len, which are two major profiling offenders.
  5529. - If do_hup fails, actually notice.
  5530. - Flush the log file descriptor after we print "Tor opening log file",
  5531. so we don't see those messages days later.
  5532. - Hidden service operators now correctly handle version 1 style
  5533. INTRODUCE1 cells (nobody generates them still, so not a critical
  5534. bug).
  5535. - Handle more errnos from accept() without closing the listener.
  5536. Some OpenBSD machines were closing their listeners because
  5537. they ran out of file descriptors.
  5538. - Some people had wrapped their tor client/server in a script
  5539. that would restart it whenever it died. This did not play well
  5540. with our "shut down if your version is obsolete" code. Now people
  5541. don't fetch a new directory if their local cached version is
  5542. recent enough.
  5543. - Make our autogen.sh work on ksh as well as bash.
  5544. - Better torrc example lines for dirbindaddress and orbindaddress.
  5545. - Improved bounds checking on parsed ints (e.g. config options and
  5546. the ones we find in directories.)
  5547. - Stop using separate defaults for no-config-file and
  5548. empty-config-file. Now you have to explicitly turn off SocksPort,
  5549. if you don't want it open.
  5550. - We were starting to daemonize before we opened our logs, so if
  5551. there were any problems opening logs, we would complain to stderr,
  5552. which wouldn't work, and then mysteriously exit.
  5553. - If a verified OR connects to us before he's uploaded his descriptor,
  5554. or we verify him and hup but he still has the original TLS
  5555. connection, then conn->nickname is still set like he's unverified.
  5556. o Code security improvements, inspired by Ilja:
  5557. - tor_snprintf wrapper over snprintf with consistent (though not C99)
  5558. overflow behavior.
  5559. - Replace sprintf with tor_snprintf. (I think they were all safe, but
  5560. hey.)
  5561. - Replace strcpy/strncpy with strlcpy in more places.
  5562. - Avoid strcat; use tor_snprintf or strlcat instead.
  5563. o Features (circuits and streams):
  5564. - New circuit building strategy: keep a list of ports that we've
  5565. used in the past 6 hours, and always try to have 2 circuits open
  5566. or on the way that will handle each such port. Seed us with port
  5567. 80 so web users won't complain that Tor is "slow to start up".
  5568. - Make kill -USR1 dump more useful stats about circuits.
  5569. - When warning about retrying or giving up, print the address, so
  5570. the user knows which one it's talking about.
  5571. - If you haven't used a clean circuit in an hour, throw it away,
  5572. just to be on the safe side. (This means after 6 hours a totally
  5573. unused Tor client will have no circuits open.)
  5574. - Support "foo.nickname.exit" addresses, to let Alice request the
  5575. address "foo" as viewed by exit node "nickname". Based on a patch
  5576. from Geoff Goodell.
  5577. - If your requested entry or exit node has advertised bandwidth 0,
  5578. pick it anyway.
  5579. - Be more greedy about filling up relay cells -- we try reading again
  5580. once we've processed the stuff we read, in case enough has arrived
  5581. to fill the last cell completely.
  5582. - Refuse application socks connections to port 0.
  5583. - Use only 0.0.9pre1 and later servers for resolve cells.
  5584. o Features (bandwidth):
  5585. - Hibernation: New config option "AccountingMax" lets you
  5586. set how many bytes per month (in each direction) you want to
  5587. allow your server to consume. Rather than spreading those
  5588. bytes out evenly over the month, we instead hibernate for some
  5589. of the month and pop up at a deterministic time, work until
  5590. the bytes are consumed, then hibernate again. Config option
  5591. "MonthlyAccountingStart" lets you specify which day of the month
  5592. your billing cycle starts on.
  5593. - Implement weekly/monthly/daily accounting: now you specify your
  5594. hibernation properties by
  5595. AccountingMax N bytes|KB|MB|GB|TB
  5596. AccountingStart day|week|month [day] HH:MM
  5597. Defaults to "month 1 0:00".
  5598. - Let bandwidth and interval config options be specified as 5 bytes,
  5599. kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
  5600. o Features (directories):
  5601. - New "router-status" line in directory, to better bind each verified
  5602. nickname to its identity key.
  5603. - Clients can ask dirservers for /dir.z to get a compressed version
  5604. of the directory. Only works for servers running 0.0.9, of course.
  5605. - Make clients cache directories and use them to seed their router
  5606. lists at startup. This means clients have a datadir again.
  5607. - Respond to content-encoding headers by trying to uncompress as
  5608. appropriate.
  5609. - Clients and servers now fetch running-routers; cache
  5610. running-routers; compress running-routers; serve compressed
  5611. running-routers.z
  5612. - Make moria2 advertise a dirport of 80, so people behind firewalls
  5613. will be able to get a directory.
  5614. - Http proxy support
  5615. - Dirservers translate requests for http://%s:%d/x to /x
  5616. - You can specify "HttpProxy %s[:%d]" and all dir fetches will
  5617. be routed through this host.
  5618. - Clients ask for /tor/x rather than /x for new enough dirservers.
  5619. This way we can one day coexist peacefully with apache.
  5620. - Clients specify a "Host: %s%d" http header, to be compatible
  5621. with more proxies, and so running squid on an exit node can work.
  5622. - Protect dirservers from overzealous descriptor uploading -- wait
  5623. 10 seconds after directory gets dirty, before regenerating.
  5624. o Features (packages and install):
  5625. - Add NSI installer contributed by J Doe.
  5626. - Apply NT service patch from Osamu Fujino. Still needs more work.
  5627. - Commit VC6 and VC7 workspace/project files.
  5628. - Commit a tor.spec for making RPM files, with help from jbash.
  5629. - Add contrib/torctl.in contributed by Glenn Fink.
  5630. - Make expand_filename handle ~ and ~username.
  5631. - Use autoconf to enable largefile support where necessary. Use
  5632. ftello where available, since ftell can fail at 2GB.
  5633. - Ship src/win32/ in the tarball, so people can use it to build.
  5634. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
  5635. is broken.
  5636. o Features (ui controller):
  5637. - Control interface: a separate program can now talk to your
  5638. client/server over a socket, and get/set config options, receive
  5639. notifications of circuits and streams starting/finishing/dying,
  5640. bandwidth used, etc. The next step is to get some GUIs working.
  5641. Let us know if you want to help out. See doc/control-spec.txt .
  5642. - Ship a contrib/tor-control.py as an example script to interact
  5643. with the control port.
  5644. - "tor --hash-password zzyxz" will output a salted password for
  5645. use in authenticating to the control interface.
  5646. - Implement the control-spec's SAVECONF command, to write your
  5647. configuration to torrc.
  5648. - Get cookie authentication for the controller closer to working.
  5649. - When set_conf changes our server descriptor, upload a new copy.
  5650. But don't upload it too often if there are frequent changes.
  5651. o Features (config and command-line):
  5652. - Deprecate unofficial config option abbreviations, and abbreviations
  5653. not on the command line.
  5654. - Configuration infrastructure support for warning on obsolete
  5655. options.
  5656. - Give a slightly more useful output for "tor -h".
  5657. - Break DirFetchPostPeriod into:
  5658. - DirFetchPeriod for fetching full directory,
  5659. - StatusFetchPeriod for fetching running-routers,
  5660. - DirPostPeriod for posting server descriptor,
  5661. - RendPostPeriod for posting hidden service descriptors.
  5662. - New log format in config:
  5663. "Log minsev[-maxsev] stdout|stderr|syslog" or
  5664. "Log minsev[-maxsev] file /var/foo"
  5665. - DirPolicy config option, to let people reject incoming addresses
  5666. from their dirserver.
  5667. - "tor --list-fingerprint" will list your identity key fingerprint
  5668. and then exit.
  5669. - Make tor --version --version dump the cvs Id of every file.
  5670. - New 'MyFamily nick1,...' config option for a server to
  5671. specify other servers that shouldn't be used in the same circuit
  5672. with it. Only believed if nick1 also specifies us.
  5673. - New 'NodeFamily nick1,nick2,...' config option for a client to
  5674. specify nodes that it doesn't want to use in the same circuit.
  5675. - New 'Redirectexit pattern address:port' config option for a
  5676. server to redirect exit connections, e.g. to a local squid.
  5677. - Add "pass" target for RedirectExit, to make it easier to break
  5678. out of a sequence of RedirectExit rules.
  5679. - Make the dirservers file obsolete.
  5680. - Include a dir-signing-key token in directories to tell the
  5681. parsing entity which key is being used to sign.
  5682. - Remove the built-in bulky default dirservers string.
  5683. - New config option "Dirserver %s:%d [fingerprint]", which can be
  5684. repeated as many times as needed. If no dirservers specified,
  5685. default to moria1,moria2,tor26.
  5686. - Make 'Routerfile' config option obsolete.
  5687. - Discourage people from setting their dirfetchpostperiod more often
  5688. than once per minute.
  5689. o Features (other):
  5690. - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
  5691. get back to normal.)
  5692. - Accept *:706 (silc) in default exit policy.
  5693. - Implement new versioning format for post 0.1.
  5694. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
  5695. log more informatively.
  5696. - Check clock skew for verified servers, but allow unverified
  5697. servers and clients to have any clock skew.
  5698. - Make sure the hidden service descriptors are at a random offset
  5699. from each other, to hinder linkability.
  5700. - Clients now generate a TLS cert too, in preparation for having
  5701. them act more like real nodes.
  5702. - Add a pure-C tor-resolve implementation.
  5703. - Use getrlimit and friends to ensure we can reach MaxConn (currently
  5704. 1024) file descriptors.
  5705. - Raise the max dns workers from 50 to 100.
  5706. Changes in version 0.0.8.1 - 2004-10-13
  5707. o Bugfixes:
  5708. - Fix a seg fault that can be triggered remotely for Tor
  5709. clients/servers with an open dirport.
  5710. - Fix a rare assert trigger, where routerinfos for entries in
  5711. our cpath would expire while we're building the path.
  5712. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  5713. - Fix a rare seg fault for people running hidden services on
  5714. intermittent connections.
  5715. - Fix a bug in parsing opt keywords with objects.
  5716. - Fix a stale pointer assert bug when a stream detaches and
  5717. reattaches.
  5718. - Fix a string format vulnerability (probably not exploitable)
  5719. in reporting stats locally.
  5720. - Fix an assert trigger: sometimes launching circuits can fail
  5721. immediately, e.g. because too many circuits have failed recently.
  5722. - Fix a compile warning on 64 bit platforms.
  5723. Changes in version 0.0.8 - 2004-08-25
  5724. o Bugfixes:
  5725. - Made our unit tests compile again on OpenBSD 3.5, and tor
  5726. itself compile again on OpenBSD on a sparc64.
  5727. - We were neglecting milliseconds when logging on win32, so
  5728. everything appeared to happen at the beginning of each second.
  5729. - Check directory signature _before_ you decide whether you're
  5730. you're running an obsolete version and should exit.
  5731. - Check directory signature _before_ you parse the running-routers
  5732. list to decide who's running.
  5733. - Check return value of fclose while writing to disk, so we don't
  5734. end up with broken files when servers run out of disk space.
  5735. - Port it to SunOS 5.9 / Athena
  5736. - Fix two bugs in saving onion keys to disk when rotating, so
  5737. hopefully we'll get fewer people using old onion keys.
  5738. - Remove our mostly unused -- and broken -- hex_encode()
  5739. function. Use base16_encode() instead. (Thanks to Timo Lindfors
  5740. for pointing out this bug.)
  5741. - Only pick and establish intro points after we've gotten a
  5742. directory.
  5743. - Fix assert triggers: if the other side returns an address 0.0.0.0,
  5744. don't put it into the client dns cache.
  5745. - If a begin failed due to exit policy, but we believe the IP
  5746. address should have been allowed, switch that router to exitpolicy
  5747. reject *:* until we get our next directory.
  5748. o Protocol changes:
  5749. - 'Extend' relay cell payloads now include the digest of the
  5750. intended next hop's identity key. Now we can verify that we're
  5751. extending to the right router, and also extend to routers we
  5752. hadn't heard of before.
  5753. o Features:
  5754. - Tor nodes can now act as relays (with an advertised ORPort)
  5755. without being manually verified by the dirserver operators.
  5756. - Uploaded descriptors of unverified routers are now accepted
  5757. by the dirservers, and included in the directory.
  5758. - Verified routers are listed by nickname in the running-routers
  5759. list; unverified routers are listed as "$<fingerprint>".
  5760. - We now use hash-of-identity-key in most places rather than
  5761. nickname or addr:port, for improved security/flexibility.
  5762. - AllowUnverifiedNodes config option to let circuits choose no-name
  5763. routers in entry,middle,exit,introduction,rendezvous positions.
  5764. Allow middle and rendezvous positions by default.
  5765. - When picking unverified routers, skip those with low uptime and/or
  5766. low bandwidth, depending on what properties you care about.
  5767. - ClientOnly option for nodes that never want to become servers.
  5768. - Directory caching.
  5769. - "AuthoritativeDir 1" option for the official dirservers.
  5770. - Now other nodes (clients and servers) will cache the latest
  5771. directory they've pulled down.
  5772. - They can enable their DirPort to serve it to others.
  5773. - Clients will pull down a directory from any node with an open
  5774. DirPort, and check the signature/timestamp correctly.
  5775. - Authoritative dirservers now fetch directories from other
  5776. authdirservers, to stay better synced.
  5777. - Running-routers list tells who's down also, along with noting
  5778. if they're verified (listed by nickname) or unverified (listed
  5779. by hash-of-key).
  5780. - Allow dirservers to serve running-router list separately.
  5781. This isn't used yet.
  5782. - You can now fetch $DIRURL/running-routers to get just the
  5783. running-routers line, not the whole descriptor list. (But
  5784. clients don't use this yet.)
  5785. - Clients choose nodes proportional to advertised bandwidth.
  5786. - Clients avoid using nodes with low uptime as introduction points.
  5787. - Handle servers with dynamic IP addresses: don't just replace
  5788. options->Address with the resolved one at startup, and
  5789. detect our address right before we make a routerinfo each time.
  5790. - 'FascistFirewall' option to pick dirservers and ORs on specific
  5791. ports; plus 'FirewallPorts' config option to tell FascistFirewall
  5792. which ports are open. (Defaults to 80,443)
  5793. - Try other dirservers immediately if the one you try is down. This
  5794. should tolerate down dirservers better now.
  5795. - ORs connect-on-demand to other ORs
  5796. - If you get an extend cell to an OR you're not connected to,
  5797. connect, handshake, and forward the create cell.
  5798. - The authoritative dirservers stay connected to everybody,
  5799. and everybody stays connected to 0.0.7 servers, but otherwise
  5800. clients/servers expire unused connections after 5 minutes.
  5801. - When servers get a sigint, they delay 30 seconds (refusing new
  5802. connections) then exit. A second sigint causes immediate exit.
  5803. - File and name management:
  5804. - Look for .torrc if no CONFDIR "torrc" is found.
  5805. - If no datadir is defined, then choose, make, and secure ~/.tor
  5806. as datadir.
  5807. - If torrc not found, exitpolicy reject *:*.
  5808. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
  5809. - If no nickname is defined, derive default from hostname.
  5810. - Rename secret key files, e.g. identity.key -> secret_id_key,
  5811. to discourage people from mailing their identity key to tor-ops.
  5812. - Refuse to build a circuit before the directory has arrived --
  5813. it won't work anyway, since you won't know the right onion keys
  5814. to use.
  5815. - Parse tor version numbers so we can do an is-newer-than check
  5816. rather than an is-in-the-list check.
  5817. - New socks command 'resolve', to let us shim gethostbyname()
  5818. locally.
  5819. - A 'tor_resolve' script to access the socks resolve functionality.
  5820. - A new socks-extensions.txt doc file to describe our
  5821. interpretation and extensions to the socks protocols.
  5822. - Add a ContactInfo option, which gets published in descriptor.
  5823. - Write tor version at the top of each log file
  5824. - New docs in the tarball:
  5825. - tor-doc.html.
  5826. - Document that you should proxy your SSL traffic too.
  5827. - Log a warning if the user uses an unsafe socks variant, so people
  5828. are more likely to learn about privoxy or socat.
  5829. - Log a warning if you're running an unverified server, to let you
  5830. know you might want to get it verified.
  5831. - Change the default exit policy to reject the default edonkey,
  5832. kazaa, gnutella ports.
  5833. - Add replace_file() to util.[ch] to handle win32's rename().
  5834. - Publish OR uptime in descriptor (and thus in directory) too.
  5835. - Remember used bandwidth (both in and out), and publish 15-minute
  5836. snapshots for the past day into our descriptor.
  5837. - Be more aggressive about trying to make circuits when the network
  5838. has changed (e.g. when you unsuspend your laptop).
  5839. - Check for time skew on http headers; report date in response to
  5840. "GET /".
  5841. - If the entrynode config line has only one node, don't pick it as
  5842. an exitnode.
  5843. - Add strict{entry|exit}nodes config options. If set to 1, then
  5844. we refuse to build circuits that don't include the specified entry
  5845. or exit nodes.
  5846. - OutboundBindAddress config option, to bind to a specific
  5847. IP address for outgoing connect()s.
  5848. - End truncated log entries (e.g. directories) with "[truncated]".
  5849. Changes in version 0.0.7.3 - 2004-08-12
  5850. o Stop dnsworkers from triggering an assert failure when you
  5851. ask them to resolve the host "".
  5852. Changes in version 0.0.7.2 - 2004-07-07
  5853. o A better fix for the 0.0.0.0 problem, that will hopefully
  5854. eliminate the remaining related assertion failures.
  5855. Changes in version 0.0.7.1 - 2004-07-04
  5856. o When an address resolves to 0.0.0.0, treat it as a failed resolve,
  5857. since internally we use 0.0.0.0 to signify "not yet resolved".
  5858. Changes in version 0.0.7 - 2004-06-07
  5859. o Fixes for crashes and other obnoxious bugs:
  5860. - Fix an epipe bug: sometimes when directory connections failed
  5861. to connect, we would give them a chance to flush before closing
  5862. them.
  5863. - When we detached from a circuit because of resolvefailed, we
  5864. would immediately try the same circuit twice more, and then
  5865. give up on the resolve thinking we'd tried three different
  5866. exit nodes.
  5867. - Limit the number of intro circuits we'll attempt to build for a
  5868. hidden service per 15-minute period.
  5869. - Check recommended-software string *early*, before actually parsing
  5870. the directory. Thus we can detect an obsolete version and exit,
  5871. even if the new directory format doesn't parse.
  5872. o Fixes for security bugs:
  5873. - Remember which nodes are dirservers when you startup, and if a
  5874. random OR enables his dirport, don't automatically assume he's
  5875. a trusted dirserver.
  5876. o Other bugfixes:
  5877. - Directory connections were asking the wrong poll socket to
  5878. start writing, and not asking themselves to start writing.
  5879. - When we detached from a circuit because we sent a begin but
  5880. didn't get a connected, we would use it again the first time;
  5881. but after that we would correctly switch to a different one.
  5882. - Stop warning when the first onion decrypt attempt fails; they
  5883. will sometimes legitimately fail now that we rotate keys.
  5884. - Override unaligned-access-ok check when $host_cpu is ia64 or
  5885. arm. Apparently they allow it but the kernel whines.
  5886. - Dirservers try to reconnect periodically too, in case connections
  5887. have failed.
  5888. - Fix some memory leaks in directory servers.
  5889. - Allow backslash in Win32 filenames.
  5890. - Made Tor build complain-free on FreeBSD, hopefully without
  5891. breaking other BSD builds. We'll see.
  5892. - Check directory signatures based on name of signer, not on whom
  5893. we got the directory from. This will let us cache directories more
  5894. easily.
  5895. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
  5896. settings too.
  5897. o Features:
  5898. - Doxygen markup on all functions and global variables.
  5899. - Make directory functions update routerlist, not replace it. So
  5900. now directory disagreements are not so critical a problem.
  5901. - Remove the upper limit on number of descriptors in a dirserver's
  5902. directory (not that we were anywhere close).
  5903. - Allow multiple logfiles at different severity ranges.
  5904. - Allow *BindAddress to specify ":port" rather than setting *Port
  5905. separately. Allow multiple instances of each BindAddress config
  5906. option, so you can bind to multiple interfaces if you want.
  5907. - Allow multiple exit policy lines, which are processed in order.
  5908. Now we don't need that huge line with all the commas in it.
  5909. - Enable accept/reject policies on SOCKS connections, so you can bind
  5910. to 0.0.0.0 but still control who can use your OP.
  5911. - Updated the man page to reflect these features.
  5912. Changes in version 0.0.6.2 - 2004-05-16
  5913. o Our integrity-checking digest was checking only the most recent cell,
  5914. not the previous cells like we'd thought.
  5915. Thanks to Stefan Mark for finding the flaw!
  5916. Changes in version 0.0.6.1 - 2004-05-06
  5917. o Fix two bugs in our AES counter-mode implementation (this affected
  5918. onion-level stream encryption, but not TLS-level). It turns
  5919. out we were doing something much more akin to a 16-character
  5920. polyalphabetic cipher. Oops.
  5921. Thanks to Stefan Mark for finding the flaw!
  5922. o Retire moria3 as a directory server, and add tor26 as a directory
  5923. server.
  5924. Changes in version 0.0.6 - 2004-05-02
  5925. o Features:
  5926. - Hidden services and rendezvous points are implemented. Go to
  5927. http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
  5928. hidden services. (This only works via a socks4a proxy such as
  5929. Privoxy, and currently it's quite slow.)
  5930. - We now rotate link (tls context) keys and onion keys.
  5931. - CREATE cells now include oaep padding, so you can tell
  5932. if you decrypted them correctly.
  5933. - Retry stream correctly when we fail to connect because of
  5934. exit-policy-reject (should try another) or can't-resolve-address.
  5935. - When we hup a dirserver and we've *removed* a server from the
  5936. approved-routers list, now we remove that server from the
  5937. in-memory directories too.
  5938. - Add bandwidthburst to server descriptor.
  5939. - Directories now say which dirserver signed them.
  5940. - Use a tor_assert macro that logs failed assertions too.
  5941. - Since we don't support truncateds much, don't bother sending them;
  5942. just close the circ.
  5943. - Fetch randomness from /dev/urandom better (not via fopen/fread)
  5944. - Better debugging for tls errors
  5945. - Set Content-Type on the directory and hidserv descriptor.
  5946. - Remove IVs from cipher code, since AES-ctr has none.
  5947. o Bugfixes:
  5948. - Fix an assert trigger for exit nodes that's been plaguing us since
  5949. the days of 0.0.2prexx (thanks weasel!)
  5950. - Fix a bug where we were closing tls connections intermittently.
  5951. It turns out openssl keeps its errors around -- so if an error
  5952. happens, and you don't ask about it, and then another openssl
  5953. operation happens and succeeds, and you ask if there was an error,
  5954. it tells you about the first error.
  5955. - Fix a bug that's been lurking since 27 may 03 (!)
  5956. When passing back a destroy cell, we would use the wrong circ id.
  5957. - Don't crash if a conn that sent a begin has suddenly lost its circuit.
  5958. - Some versions of openssl have an SSL_pending function that erroneously
  5959. returns bytes when there is a non-application record pending.
  5960. - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
  5961. o We were using an array of length zero in a few places.
  5962. o Win32's gethostbyname can't resolve an IP to an IP.
  5963. o Win32's close can't close a socket.
  5964. o Handle windows socket errors correctly.
  5965. o Portability:
  5966. - check for <sys/limits.h> so we build on FreeBSD again, and
  5967. <machine/limits.h> for NetBSD.
  5968. Changes in version 0.0.5 - 2004-03-30
  5969. o Install torrc as torrc.sample -- we no longer clobber your
  5970. torrc. (Woo!)
  5971. o Fix mangled-state bug in directory fetching (was causing sigpipes).
  5972. o Only build circuits after we've fetched the directory: clients were
  5973. using only the directory servers before they'd fetched a directory.
  5974. This also means longer startup time; so it goes.
  5975. o Fix an assert trigger where an OP would fail to handshake, and we'd
  5976. expect it to have a nickname.
  5977. o Work around a tsocks bug: do a socks reject when AP connection dies
  5978. early, else tsocks goes into an infinite loop.
  5979. o Hold socks connection open until reply is flushed (if possible)
  5980. o Make exit nodes resolve IPs to IPs immediately, rather than asking
  5981. the dns farm to do it.
  5982. o Fix c99 aliasing warnings in rephist.c
  5983. o Don't include server descriptors that are older than 24 hours in the
  5984. directory.
  5985. o Give socks 'reject' replies their whole 15s to attempt to flush,
  5986. rather than seeing the 60s timeout and assuming the flush had failed.
  5987. o Clean automake droppings from the cvs repository
  5988. o Add in a 'notice' log level for things the operator should hear
  5989. but that aren't warnings
  5990. Changes in version 0.0.4 - 2004-03-26
  5991. o When connecting to a dirserver or OR and the network is down,
  5992. we would crash.
  5993. Changes in version 0.0.3 - 2004-03-26
  5994. o Warn and fail if server chose a nickname with illegal characters
  5995. o Port to Solaris and Sparc:
  5996. - include missing header fcntl.h
  5997. - have autoconf find -lsocket -lnsl automatically
  5998. - deal with hardware word alignment
  5999. - make uname() work (solaris has a different return convention)
  6000. - switch from using signal() to sigaction()
  6001. o Preliminary work on reputation system:
  6002. - Keep statistics on success/fail of connect attempts; they're published
  6003. by kill -USR1 currently.
  6004. - Add a RunTesting option to try to learn link state by creating test
  6005. circuits, even when SocksPort is off.
  6006. - Remove unused open circuits when there are too many.
  6007. Changes in version 0.0.2 - 2004-03-19
  6008. - Include strlcpy and strlcat for safer string ops
  6009. - define INADDR_NONE so we compile (but still not run) on solaris
  6010. Changes in version 0.0.2pre27 - 2004-03-14
  6011. o Bugfixes:
  6012. - Allow internal tor networks (we were rejecting internal IPs,
  6013. now we allow them if they're set explicitly).
  6014. - And fix a few endian issues.
  6015. Changes in version 0.0.2pre26 - 2004-03-14
  6016. o New features:
  6017. - If a stream times out after 15s without a connected cell, don't
  6018. try that circuit again: try a new one.
  6019. - Retry streams at most 4 times. Then give up.
  6020. - When a dirserver gets a descriptor from an unknown router, it
  6021. logs its fingerprint (so the dirserver operator can choose to
  6022. accept it even without mail from the server operator).
  6023. - Inform unapproved servers when we reject their descriptors.
  6024. - Make tor build on Windows again. It works as a client, who knows
  6025. about as a server.
  6026. - Clearer instructions in the torrc for how to set up a server.
  6027. - Be more efficient about reading fd's when our global token bucket
  6028. (used for rate limiting) becomes empty.
  6029. o Bugfixes:
  6030. - Stop asserting that computers always go forward in time. It's
  6031. simply not true.
  6032. - When we sent a cell (e.g. destroy) and then marked an OR connection
  6033. expired, we might close it before finishing a flush if the other
  6034. side isn't reading right then.
  6035. - Don't allow dirservers to start if they haven't defined
  6036. RecommendedVersions
  6037. - We were caching transient dns failures. Oops.
  6038. - Prevent servers from publishing an internal IP as their address.
  6039. - Address a strcat vulnerability in circuit.c
  6040. Changes in version 0.0.2pre25 - 2004-03-04
  6041. o New features:
  6042. - Put the OR's IP in its router descriptor, not its fqdn. That way
  6043. we'll stop being stalled by gethostbyname for nodes with flaky dns,
  6044. e.g. poblano.
  6045. o Bugfixes:
  6046. - If the user typed in an address that didn't resolve, the server
  6047. crashed.
  6048. Changes in version 0.0.2pre24 - 2004-03-03
  6049. o Bugfixes:
  6050. - Fix an assertion failure in dns.c, where we were trying to dequeue
  6051. a pending dns resolve even if it wasn't pending
  6052. - Fix a spurious socks5 warning about still trying to write after the
  6053. connection is finished.
  6054. - Hold certain marked_for_close connections open until they're finished
  6055. flushing, rather than losing bytes by closing them too early.
  6056. - Correctly report the reason for ending a stream
  6057. - Remove some duplicate calls to connection_mark_for_close
  6058. - Put switch_id and start_daemon earlier in the boot sequence, so it
  6059. will actually try to chdir() to options.DataDirectory
  6060. - Make 'make test' exit(1) if a test fails; fix some unit tests
  6061. - Make tor fail when you use a config option it doesn't know about,
  6062. rather than warn and continue.
  6063. - Make --version work
  6064. - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
  6065. Changes in version 0.0.2pre23 - 2004-02-29
  6066. o New features:
  6067. - Print a statement when the first circ is finished, so the user
  6068. knows it's working.
  6069. - If a relay cell is unrecognized at the end of the circuit,
  6070. send back a destroy. (So attacks to mutate cells are more
  6071. clearly thwarted.)
  6072. - New config option 'excludenodes' to avoid certain nodes for circuits.
  6073. - When it daemonizes, it chdir's to the DataDirectory rather than "/",
  6074. so you can collect coredumps there.
  6075. o Bugfixes:
  6076. - Fix a bug in tls flushing where sometimes data got wedged and
  6077. didn't flush until more data got sent. Hopefully this bug was
  6078. a big factor in the random delays we were seeing.
  6079. - Make 'connected' cells include the resolved IP, so the client
  6080. dns cache actually gets populated.
  6081. - Disallow changing from ORPort=0 to ORPort>0 on hup.
  6082. - When we time-out on a stream and detach from the circuit, send an
  6083. end cell down it first.
  6084. - Only warn about an unknown router (in exitnodes, entrynodes,
  6085. excludenodes) after we've fetched a directory.
  6086. Changes in version 0.0.2pre22 - 2004-02-26
  6087. o New features:
  6088. - Servers publish less revealing uname information in descriptors.
  6089. - More memory tracking and assertions, to crash more usefully when
  6090. errors happen.
  6091. - If the default torrc isn't there, just use some default defaults.
  6092. Plus provide an internal dirservers file if they don't have one.
  6093. - When the user tries to use Tor as an http proxy, give them an http
  6094. 501 failure explaining that we're a socks proxy.
  6095. - Dump a new router.desc on hup, to help confused people who change
  6096. their exit policies and then wonder why router.desc doesn't reflect
  6097. it.
  6098. - Clean up the generic tor.sh init script that we ship with.
  6099. o Bugfixes:
  6100. - If the exit stream is pending on the resolve, and a destroy arrives,
  6101. then the stream wasn't getting removed from the pending list. I
  6102. think this was the one causing recent server crashes.
  6103. - Use a more robust poll on OSX 10.3, since their poll is flaky.
  6104. - When it couldn't resolve any dirservers, it was useless from then on.
  6105. Now it reloads the RouterFile (or default dirservers) if it has no
  6106. dirservers.
  6107. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
  6108. many users don't even *have* a /usr/local/sbin/.
  6109. Changes in version 0.0.2pre21 - 2004-02-18
  6110. o New features:
  6111. - There's a ChangeLog file that actually reflects the changelog.
  6112. - There's a 'torify' wrapper script, with an accompanying
  6113. tor-tsocks.conf, that simplifies the process of using tsocks for
  6114. tor. It even has a man page.
  6115. - The tor binary gets installed to sbin rather than bin now.
  6116. - Retry streams where the connected cell hasn't arrived in 15 seconds
  6117. - Clean up exit policy handling -- get the default out of the torrc,
  6118. so we can update it without forcing each server operator to fix
  6119. his/her torrc.
  6120. - Allow imaps and pop3s in default exit policy
  6121. o Bugfixes:
  6122. - Prevent picking middleman nodes as the last node in the circuit
  6123. Changes in version 0.0.2pre20 - 2004-01-30
  6124. o New features:
  6125. - We now have a deb package, and it's in debian unstable. Go to
  6126. it, apt-getters. :)
  6127. - I've split the TotalBandwidth option into BandwidthRate (how many
  6128. bytes per second you want to allow, long-term) and
  6129. BandwidthBurst (how many bytes you will allow at once before the cap
  6130. kicks in). This better token bucket approach lets you, say, set
  6131. BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
  6132. performance while not exceeding your monthly bandwidth quota.
  6133. - Push out a tls record's worth of data once you've got it, rather
  6134. than waiting until you've read everything waiting to be read. This
  6135. may improve performance by pipelining better. We'll see.
  6136. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
  6137. from failed circuits (if they haven't been connected yet) and attach
  6138. to new ones.
  6139. - Expire old streams that haven't managed to connect. Some day we'll
  6140. have them reattach to new circuits instead.
  6141. o Bugfixes:
  6142. - Fix several memory leaks that were causing servers to become bloated
  6143. after a while.
  6144. - Fix a few very rare assert triggers. A few more remain.
  6145. - Setuid to User _before_ complaining about running as root.
  6146. Changes in version 0.0.2pre19 - 2004-01-07
  6147. o Bugfixes:
  6148. - Fix deadlock condition in dns farm. We were telling a child to die by
  6149. closing the parent's file descriptor to him. But newer children were
  6150. inheriting the open file descriptor from the parent, and since they
  6151. weren't closing it, the socket never closed, so the child never read
  6152. eof, so he never knew to exit. Similarly, dns workers were holding
  6153. open other sockets, leading to all sorts of chaos.
  6154. - New cleaner daemon() code for forking and backgrounding.
  6155. - If you log to a file, it now prints an entry at the top of the
  6156. logfile so you know it's working.
  6157. - The onionskin challenge length was 30 bytes longer than necessary.
  6158. - Started to patch up the spec so it's not quite so out of date.
  6159. Changes in version 0.0.2pre18 - 2004-01-02
  6160. o Bugfixes:
  6161. - Fix endian issues with the 'integrity' field in the relay header.
  6162. - Fix a potential bug where connections in state
  6163. AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
  6164. Changes in version 0.0.2pre17 - 2003-12-30
  6165. o Bugfixes:
  6166. - Made --debuglogfile (or any second log file, actually) work.
  6167. - Resolved an edge case in get_unique_circ_id_by_conn where a smart
  6168. adversary could force us into an infinite loop.
  6169. o Features:
  6170. - Each onionskin handshake now includes a hash of the computed key,
  6171. to prove the server's identity and help perfect forward secrecy.
  6172. - Changed cell size from 256 to 512 bytes (working toward compatibility
  6173. with MorphMix).
  6174. - Changed cell length to 2 bytes, and moved it to the relay header.
  6175. - Implemented end-to-end integrity checking for the payloads of
  6176. relay cells.
  6177. - Separated streamid from 'recognized' (otherwise circuits will get
  6178. messed up when we try to have streams exit from the middle). We
  6179. use the integrity-checking to confirm that a cell is addressed to
  6180. this hop.
  6181. - Randomize the initial circid and streamid values, so an adversary who
  6182. breaks into a node can't learn how many circuits or streams have
  6183. been made so far.
  6184. Changes in version 0.0.2pre16 - 2003-12-14
  6185. o Bugfixes:
  6186. - Fixed a bug that made HUP trigger an assert
  6187. - Fixed a bug where a circuit that immediately failed wasn't being
  6188. counted as a failed circuit in counting retries.
  6189. o Features:
  6190. - Now we close the circuit when we get a truncated cell: otherwise we're
  6191. open to an anonymity attack where a bad node in the path truncates
  6192. the circuit and then we open streams at him.
  6193. - Add port ranges to exit policies
  6194. - Add a conservative default exit policy
  6195. - Warn if you're running tor as root
  6196. - on HUP, retry OR connections and close/rebind listeners
  6197. - options.EntryNodes: try these nodes first when picking the first node
  6198. - options.ExitNodes: if your best choices happen to include any of
  6199. your preferred exit nodes, you choose among just those preferred
  6200. exit nodes.
  6201. - options.ExcludedNodes: nodes that are never picked in path building
  6202. Changes in version 0.0.2pre15 - 2003-12-03
  6203. o Robustness and bugfixes:
  6204. - Sometimes clients would cache incorrect DNS resolves, which would
  6205. really screw things up.
  6206. - An OP that goes offline would slowly leak all its sockets and stop
  6207. working.
  6208. - A wide variety of bugfixes in exit node selection, exit policy
  6209. handling, and processing pending streams when a new circuit is
  6210. established.
  6211. - Pick nodes for a path only from those the directory says are up
  6212. - Choose randomly from all running dirservers, not always the first one
  6213. - Increase allowed http header size for directory fetch.
  6214. - Stop writing to stderr (if we're daemonized it will be closed).
  6215. - Enable -g always, so cores will be more useful to me.
  6216. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
  6217. o Documentation:
  6218. - Wrote a man page. It lists commonly used options.
  6219. o Configuration:
  6220. - Change default loglevel to warn.
  6221. - Make PidFile default to null rather than littering in your CWD.
  6222. - OnionRouter config option is now obsolete. Instead it just checks
  6223. ORPort>0.
  6224. - Moved to a single unified torrc file for both clients and servers.
  6225. Changes in version 0.0.2pre14 - 2003-11-29
  6226. o Robustness and bugfixes:
  6227. - Force the admin to make the DataDirectory himself
  6228. - to get ownership/permissions right
  6229. - so clients no longer make a DataDirectory and then never use it
  6230. - fix bug where a client who was offline for 45 minutes would never
  6231. pull down a directory again
  6232. - fix (or at least hide really well) the dns assert bug that was
  6233. causing server crashes
  6234. - warnings and improved robustness wrt clockskew for certs
  6235. - use the native daemon(3) to daemonize, when available
  6236. - exit if bind() fails
  6237. - exit if neither socksport nor orport is defined
  6238. - include our own tor_timegm (Win32 doesn't have its own)
  6239. - bugfix for win32 with lots of connections
  6240. - fix minor bias in PRNG
  6241. - make dirserver more robust to corrupt cached directory
  6242. o Documentation:
  6243. - Wrote the design document (woo)
  6244. o Circuit building and exit policies:
  6245. - Circuits no longer try to use nodes that the directory has told them
  6246. are down.
  6247. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
  6248. bitcounts (18.0.0.0/8).
  6249. - Make AP connections standby for a circuit if no suitable circuit
  6250. exists, rather than failing
  6251. - Circuits choose exit node based on addr/port, exit policies, and
  6252. which AP connections are standing by
  6253. - Bump min pathlen from 2 to 3
  6254. - Relay end cells have a payload to describe why the stream ended.
  6255. - If the stream failed because of exit policy, try again with a new
  6256. circuit.
  6257. - Clients have a dns cache to remember resolved addresses.
  6258. - Notice more quickly when we have no working circuits
  6259. o Configuration:
  6260. - APPort is now called SocksPort
  6261. - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
  6262. where to bind
  6263. - RecommendedVersions is now a config variable rather than
  6264. hardcoded (for dirservers)
  6265. - Reloads config on HUP
  6266. - Usage info on -h or --help
  6267. - If you set User and Group config vars, it'll setu/gid to them.
  6268. Changes in version 0.0.2pre13 - 2003-10-19
  6269. o General stability:
  6270. - SSL_write no longer fails when it returns WANTWRITE and the number
  6271. of bytes in the buf has changed by the next SSL_write call.
  6272. - Fix segfault fetching directory when network is down
  6273. - Fix a variety of minor memory leaks
  6274. - Dirservers reload the fingerprints file on HUP, so I don't have
  6275. to take down the network when I approve a new router
  6276. - Default server config file has explicit Address line to specify fqdn
  6277. o Buffers:
  6278. - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
  6279. - Make listener connections not ever alloc bufs
  6280. o Autoconf improvements:
  6281. - don't clobber an external CFLAGS in ./configure
  6282. - Make install now works
  6283. - create var/lib/tor on make install
  6284. - autocreate a tor.sh initscript to help distribs
  6285. - autocreate the torrc and sample-server-torrc with correct paths
  6286. o Log files and Daemonizing now work:
  6287. - If --DebugLogFile is specified, log to it at -l debug
  6288. - If --LogFile is specified, use it instead of commandline
  6289. - If --RunAsDaemon is set, tor forks and backgrounds on startup