ReleaseNotes 813 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 0.3.0.8 - 2017-06-08
  5. Tor 0.3.0.8 fixes a pair of bugs that would allow an attacker to
  6. remotely crash a hidden service with an assertion failure. Anyone
  7. running a hidden service should upgrade to this version, or to some
  8. other version with fixes for TROVE-2017-004 and TROVE-2017-005.
  9. Tor 0.3.0.8 also includes fixes for several key management bugs
  10. that sometimes made relays unreliable, as well as several other
  11. bugfixes described below.
  12. o Major bugfixes (hidden service, relay, security, backport
  13. from 0.3.1.3-alpha):
  14. - Fix a remotely triggerable assertion failure when a hidden service
  15. handles a malformed BEGIN cell. Fixes bug 22493, tracked as
  16. TROVE-2017-004 and as CVE-2017-0375; bugfix on 0.3.0.1-alpha.
  17. - Fix a remotely triggerable assertion failure caused by receiving a
  18. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  19. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  20. on 0.2.2.1-alpha.
  21. o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
  22. - When performing the v3 link handshake on a TLS connection, report
  23. that we have the x509 certificate that we actually used on that
  24. connection, even if we have changed certificates since that
  25. connection was first opened. Previously, we would claim to have
  26. used our most recent x509 link certificate, which would sometimes
  27. make the link handshake fail. Fixes one case of bug 22460; bugfix
  28. on 0.2.3.6-alpha.
  29. o Major bugfixes (relays, key management, backport from 0.3.1.3-alpha):
  30. - Regenerate link and authentication certificates whenever the key
  31. that signs them changes; also, regenerate link certificates
  32. whenever the signed key changes. Previously, these processes were
  33. only weakly coupled, and we relays could (for minutes to hours)
  34. wind up with an inconsistent set of keys and certificates, which
  35. other relays would not accept. Fixes two cases of bug 22460;
  36. bugfix on 0.3.0.1-alpha.
  37. - When sending an Ed25519 signing->link certificate in a CERTS cell,
  38. send the certificate that matches the x509 certificate that we
  39. used on the TLS connection. Previously, there was a race condition
  40. if the TLS context rotated after we began the TLS handshake but
  41. before we sent the CERTS cell. Fixes a case of bug 22460; bugfix
  42. on 0.3.0.1-alpha.
  43. o Major bugfixes (hidden service v3, backport from 0.3.1.1-alpha):
  44. - Stop rejecting v3 hidden service descriptors because their size
  45. did not match an old padding rule. Fixes bug 22447; bugfix on
  46. tor-0.3.0.1-alpha.
  47. o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
  48. - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
  49. December 2016 (of which ~126 were still functional) with a list of
  50. 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
  51. 2017. Resolves ticket 21564.
  52. o Minor bugfixes (configuration, backport from 0.3.1.1-alpha):
  53. - Do not crash when starting with LearnCircuitBuildTimeout 0. Fixes
  54. bug 22252; bugfix on 0.2.9.3-alpha.
  55. o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
  56. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  57. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  58. o Minor bugfixes (link handshake, backport from 0.3.1.3-alpha):
  59. - Lower the lifetime of the RSA->Ed25519 cross-certificate to six
  60. months, and regenerate it when it is within one month of expiring.
  61. Previously, we had generated this certificate at startup with a
  62. ten-year lifetime, but that could lead to weird behavior when Tor
  63. was started with a grossly inaccurate clock. Mitigates bug 22466;
  64. mitigation on 0.3.0.1-alpha.
  65. o Minor bugfixes (memory leak, directory authority, backport from
  66. 0.3.1.2-alpha):
  67. - When directory authorities reject a router descriptor due to
  68. keypinning, free the router descriptor rather than leaking the
  69. memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
  70. Changes in version 0.2.9.11 - 2017-06-08
  71. Tor 0.2.9.11 fixes a pair of bugs that would allow an attacker to
  72. remotely crash a hidden service with an assertion failure. Anyone
  73. running a hidden service should upgrade to this version, or to some
  74. other version with fixes for TROVE-2017-004 and TROVE-2017-005.
  75. Tor 0.2.9.11 also backports fixes for several key management bugs
  76. that sometimes made relays unreliable, as well as several other
  77. bugfixes described below.
  78. o Major bugfixes (hidden service, relay, security, backport
  79. from 0.3.1.3-alpha):
  80. - Fix a remotely triggerable assertion failure caused by receiving a
  81. BEGIN_DIR cell on a hidden service rendezvous circuit. Fixes bug
  82. 22494, tracked as TROVE-2017-005 and CVE-2017-0376; bugfix
  83. on 0.2.2.1-alpha.
  84. o Major bugfixes (relay, link handshake, backport from 0.3.1.3-alpha):
  85. - When performing the v3 link handshake on a TLS connection, report
  86. that we have the x509 certificate that we actually used on that
  87. connection, even if we have changed certificates since that
  88. connection was first opened. Previously, we would claim to have
  89. used our most recent x509 link certificate, which would sometimes
  90. make the link handshake fail. Fixes one case of bug 22460; bugfix
  91. on 0.2.3.6-alpha.
  92. o Minor features (fallback directory list, backport from 0.3.1.3-alpha):
  93. - Replace the 177 fallbacks originally introduced in Tor 0.2.9.8 in
  94. December 2016 (of which ~126 were still functional) with a list of
  95. 151 fallbacks (32 new, 119 unchanged, 58 removed) generated in May
  96. 2017. Resolves ticket 21564.
  97. o Minor features (future-proofing, backport from 0.3.0.7):
  98. - Tor no longer refuses to download microdescriptors or descriptors if
  99. they are listed as "published in the future". This change will
  100. eventually allow us to stop listing meaningful "published" dates
  101. in microdescriptor consensuses, and thereby allow us to reduce the
  102. resources required to download consensus diffs by over 50%.
  103. Implements part of ticket 21642; implements part of proposal 275.
  104. o Minor features (directory authorities, backport from 0.3.0.4-rc)
  105. - Directory authorities now reject relays running versions
  106. 0.2.9.1-alpha through 0.2.9.4-alpha, because those relays
  107. suffer from bug 20499 and don't keep their consensus cache
  108. up-to-date. Resolves ticket 20509.
  109. o Minor features (geoip):
  110. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  111. Country database.
  112. o Minor bugfixes (control port, backport from 0.3.0.6):
  113. - The GETINFO extra-info/digest/<digest> command was broken because
  114. of a wrong base16 decode return value check, introduced when
  115. refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
  116. o Minor bugfixes (correctness, backport from 0.3.1.3-alpha):
  117. - Avoid undefined behavior when parsing IPv6 entries from the geoip6
  118. file. Fixes bug 22490; bugfix on 0.2.4.6-alpha.
  119. o Minor bugfixes (Linux seccomp2 sandbox, backport from 0.3.0.7):
  120. - The getpid() system call is now permitted under the Linux seccomp2
  121. sandbox, to avoid crashing with versions of OpenSSL (and other
  122. libraries) that attempt to learn the process's PID by using the
  123. syscall rather than the VDSO code. Fixes bug 21943; bugfix
  124. on 0.2.5.1-alpha.
  125. o Minor bugfixes (memory leak, directory authority, backport
  126. from 0.3.1.2-alpha):
  127. - When directory authorities reject a router descriptor due to
  128. keypinning, free the router descriptor rather than leaking the
  129. memory. Fixes bug 22370; bugfix on 0.2.7.2-alpha.
  130. Changes in version 0.3.0.7 - 2017-05-15
  131. Tor 0.3.0.7 fixes a medium-severity security bug in earlier versions
  132. of Tor 0.3.0.x, where an attacker could cause a Tor relay process
  133. to exit. Relays running earlier versions of Tor 0.3.0.x should upgrade;
  134. clients are not affected.
  135. o Major bugfixes (hidden service directory, security):
  136. - Fix an assertion failure in the hidden service directory code, which
  137. could be used by an attacker to remotely cause a Tor relay process to
  138. exit. Relays running earlier versions of Tor 0.3.0.x should upgrade.
  139. should upgrade. This security issue is tracked as TROVE-2017-002.
  140. Fixes bug 22246; bugfix on 0.3.0.1-alpha.
  141. o Minor features:
  142. - Update geoip and geoip6 to the May 2 2017 Maxmind GeoLite2
  143. Country database.
  144. o Minor features (future-proofing):
  145. - Tor no longer refuses to download microdescriptors or descriptors
  146. if they are listed as "published in the future". This change will
  147. eventually allow us to stop listing meaningful "published" dates
  148. in microdescriptor consensuses, and thereby allow us to reduce the
  149. resources required to download consensus diffs by over 50%.
  150. Implements part of ticket 21642; implements part of proposal 275.
  151. o Minor bugfixes (Linux seccomp2 sandbox):
  152. - The getpid() system call is now permitted under the Linux seccomp2
  153. sandbox, to avoid crashing with versions of OpenSSL (and other
  154. libraries) that attempt to learn the process's PID by using the
  155. syscall rather than the VDSO code. Fixes bug 21943; bugfix
  156. on 0.2.5.1-alpha.
  157. Changes in version 0.3.0.6 - 2017-04-26
  158. Tor 0.3.0.6 is the first stable release of the Tor 0.3.0 series.
  159. With the 0.3.0 series, clients and relays now use Ed25519 keys to
  160. authenticate their link connections to relays, rather than the old
  161. RSA1024 keys that they used before. (Circuit crypto has been
  162. Curve25519-authenticated since 0.2.4.8-alpha.) We have also replaced
  163. the guard selection and replacement algorithm to behave more robustly
  164. in the presence of unreliable networks, and to resist guard-
  165. capture attacks.
  166. This series also includes numerous other small features and bugfixes,
  167. along with more groundwork for the upcoming hidden-services revamp.
  168. Per our stable release policy, we plan to support the Tor 0.3.0
  169. release series for at least the next nine months, or for three months
  170. after the first stable release of the 0.3.1 series: whichever is
  171. longer. If you need a release with long-term support, we recommend
  172. that you stay with the 0.2.9 series.
  173. Below are the changes since 0.2.9.10. For a list of only the changes
  174. since 0.3.0.5-rc, see the ChangeLog file.
  175. o Major features (directory authority, security):
  176. - The default for AuthDirPinKeys is now 1: directory authorities
  177. will reject relays where the RSA identity key matches a previously
  178. seen value, but the Ed25519 key has changed. Closes ticket 18319.
  179. o Major features (guard selection algorithm):
  180. - Tor's guard selection algorithm has been redesigned from the
  181. ground up, to better support unreliable networks and restrictive
  182. sets of entry nodes, and to better resist guard-capture attacks by
  183. hostile local networks. Implements proposal 271; closes
  184. ticket 19877.
  185. o Major features (next-generation hidden services):
  186. - Relays can now handle v3 ESTABLISH_INTRO cells as specified by
  187. prop224 aka "Next Generation Hidden Services". Service and clients
  188. don't use this functionality yet. Closes ticket 19043. Based on
  189. initial code by Alec Heifetz.
  190. - Relays now support the HSDir version 3 protocol, so that they can
  191. can store and serve v3 descriptors. This is part of the next-
  192. generation onion service work detailled in proposal 224. Closes
  193. ticket 17238.
  194. o Major features (protocol, ed25519 identity keys):
  195. - Clients now support including Ed25519 identity keys in the EXTEND2
  196. cells they generate. By default, this is controlled by a consensus
  197. parameter, currently disabled. You can turn this feature on for
  198. testing by setting ExtendByEd25519ID in your configuration. This
  199. might make your traffic appear different than the traffic
  200. generated by other users, however. Implements part of ticket
  201. 15056; part of proposal 220.
  202. - Relays now understand requests to extend to other relays by their
  203. Ed25519 identity keys. When an Ed25519 identity key is included in
  204. an EXTEND2 cell, the relay will only extend the circuit if the
  205. other relay can prove ownership of that identity. Implements part
  206. of ticket 15056; part of proposal 220.
  207. - Relays now use Ed25519 to prove their Ed25519 identities and to
  208. one another, and to clients. This algorithm is faster and more
  209. secure than the RSA-based handshake we've been doing until now.
  210. Implements the second big part of proposal 220; Closes
  211. ticket 15055.
  212. o Major features (security):
  213. - Change the algorithm used to decide DNS TTLs on client and server
  214. side, to better resist DNS-based correlation attacks like the
  215. DefecTor attack of Greschbach, Pulls, Roberts, Winter, and
  216. Feamster. Now relays only return one of two possible DNS TTL
  217. values, and clients are willing to believe DNS TTL values up to 3
  218. hours long. Closes ticket 19769.
  219. o Major bugfixes (client, onion service, also in 0.2.9.9):
  220. - Fix a client-side onion service reachability bug, where multiple
  221. socks requests to an onion service (or a single slow request)
  222. could cause us to mistakenly mark some of the service's
  223. introduction points as failed, and we cache that failure so
  224. eventually we run out and can't reach the service. Also resolves a
  225. mysterious "Remote server sent bogus reason code 65021" log
  226. warning. The bug was introduced in ticket 17218, where we tried to
  227. remember the circuit end reason as a uint16_t, which mangled
  228. negative values. Partially fixes bug 21056 and fixes bug 20307;
  229. bugfix on 0.2.8.1-alpha.
  230. o Major bugfixes (crash, directory connections):
  231. - Fix a rare crash when sending a begin cell on a circuit whose
  232. linked directory connection had already been closed. Fixes bug
  233. 21576; bugfix on 0.2.9.3-alpha. Reported by Alec Muffett.
  234. o Major bugfixes (directory authority):
  235. - During voting, when marking a relay as a probable sybil, do not
  236. clear its BadExit flag: sybils can still be bad in other ways
  237. too. (We still clear the other flags.) Fixes bug 21108; bugfix
  238. on 0.2.0.13-alpha.
  239. o Major bugfixes (DNS):
  240. - Fix a bug that prevented exit nodes from caching DNS records for
  241. more than 60 seconds. Fixes bug 19025; bugfix on 0.2.4.7-alpha.
  242. o Major bugfixes (IPv6 Exits):
  243. - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
  244. any IPv6 addresses. Instead, only reject a port over IPv6 if the
  245. exit policy rejects that port on more than an IPv6 /16 of
  246. addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
  247. which rejected a relay's own IPv6 address by default. Fixes bug
  248. 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
  249. o Major bugfixes (parsing):
  250. - Fix an integer underflow bug when comparing malformed Tor
  251. versions. This bug could crash Tor when built with
  252. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  253. 0.2.9.8, which were built with -ftrapv by default. In other cases
  254. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  255. on 0.0.8pre1. Found by OSS-Fuzz.
  256. - When parsing a malformed content-length field from an HTTP
  257. message, do not read off the end of the buffer. This bug was a
  258. potential remote denial-of-service attack against Tor clients and
  259. relays. A workaround was released in October 2016, to prevent this
  260. bug from crashing Tor. This is a fix for the underlying issue,
  261. which should no longer matter (if you applied the earlier patch).
  262. Fixes bug 20894; bugfix on 0.2.0.16-alpha. Bug found by fuzzing
  263. using AFL (http://lcamtuf.coredump.cx/afl/).
  264. o Major bugfixes (scheduler):
  265. - Actually compare circuit policies in ewma_cmp_cmux(). This bug
  266. caused the channel scheduler to behave more or less randomly,
  267. rather than preferring channels with higher-priority circuits.
  268. Fixes bug 20459; bugfix on 0.2.6.2-alpha.
  269. o Major bugfixes (security, also in 0.2.9.9):
  270. - Downgrade the "-ftrapv" option from "always on" to "only on when
  271. --enable-expensive-hardening is provided." This hardening option,
  272. like others, can turn survivable bugs into crashes--and having it
  273. on by default made a (relatively harmless) integer overflow bug
  274. into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
  275. bugfix on 0.2.9.1-alpha.
  276. o Minor feature (client):
  277. - Enable IPv6 traffic on the SocksPort by default. To disable this,
  278. a user will have to specify "NoIPv6Traffic". Closes ticket 21269.
  279. o Minor feature (fallback scripts):
  280. - Add a check_existing mode to updateFallbackDirs.py, which checks
  281. if fallbacks in the hard-coded list are working. Closes ticket
  282. 20174. Patch by haxxpop.
  283. o Minor feature (protocol versioning):
  284. - Add new protocol version for proposal 224. HSIntro now advertises
  285. version "3-4" and HSDir version "1-2". Fixes ticket 20656.
  286. o Minor features (ciphersuite selection):
  287. - Allow relays to accept a wider range of ciphersuites, including
  288. chacha20-poly1305 and AES-CCM. Closes the other part of 15426.
  289. - Clients now advertise a list of ciphersuites closer to the ones
  290. preferred by Firefox. Closes part of ticket 15426.
  291. o Minor features (controller):
  292. - Add "GETINFO sr/current" and "GETINFO sr/previous" keys, to expose
  293. shared-random values to the controller. Closes ticket 19925.
  294. - When HSFETCH arguments cannot be parsed, say "Invalid argument"
  295. rather than "unrecognized." Closes ticket 20389; patch from
  296. Ivan Markin.
  297. o Minor features (controller, configuration):
  298. - Each of the *Port options, such as SocksPort, ORPort, ControlPort,
  299. and so on, now comes with a __*Port variant that will not be saved
  300. to the torrc file by the controller's SAVECONF command. This
  301. change allows TorBrowser to set up a single-use domain socket for
  302. each time it launches Tor. Closes ticket 20956.
  303. - The GETCONF command can now query options that may only be
  304. meaningful in context-sensitive lists. This allows the controller
  305. to query the mixed SocksPort/__SocksPort style options introduced
  306. in feature 20956. Implements ticket 21300.
  307. o Minor features (diagnostic, directory client):
  308. - Warn when we find an unexpected inconsistency in directory
  309. download status objects. Prevents some negative consequences of
  310. bug 20593.
  311. o Minor features (directory authorities):
  312. - Directory authorities now reject descriptors that claim to be
  313. malformed versions of Tor. Helps prevent exploitation of
  314. bug 21278.
  315. - Reject version numbers with components that exceed INT32_MAX.
  316. Otherwise 32-bit and 64-bit platforms would behave inconsistently.
  317. Fixes bug 21450; bugfix on 0.0.8pre1.
  318. o Minor features (directory authority):
  319. - Add a new authority-only AuthDirTestEd25519LinkKeys option (on by
  320. default) to control whether authorities should try to probe relays
  321. by their Ed25519 link keys. This option will go away in a few
  322. releases--unless we encounter major trouble in our ed25519 link
  323. protocol rollout, in which case it will serve as a safety option.
  324. o Minor features (directory cache):
  325. - Relays and bridges will now refuse to serve the consensus they
  326. have if they know it is too old for a client to use. Closes
  327. ticket 20511.
  328. o Minor features (ed25519 link handshake):
  329. - Advertise support for the ed25519 link handshake using the
  330. subprotocol-versions mechanism, so that clients can tell which
  331. relays can identity themselves by Ed25519 ID. Closes ticket 20552.
  332. o Minor features (entry guards):
  333. - Add UseEntryGuards to TEST_OPTIONS_DEFAULT_VALUES in order to not
  334. break regression tests.
  335. - Require UseEntryGuards when UseBridges is set, in order to make
  336. sure bridges aren't bypassed. Resolves ticket 20502.
  337. o Minor features (fallback directories):
  338. - Allow 3 fallback relays per operator, which is safe now that we
  339. are choosing 200 fallback relays. Closes ticket 20912.
  340. - Annotate updateFallbackDirs.py with the bandwidth and consensus
  341. weight for each candidate fallback. Closes ticket 20878.
  342. - Display the relay fingerprint when downloading consensuses from
  343. fallbacks. Closes ticket 20908.
  344. - Exclude relays affected by bug 20499 from the fallback list.
  345. Exclude relays from the fallback list if they are running versions
  346. known to be affected by bug 20499, or if in our tests they deliver
  347. a stale consensus (i.e. one that expired more than 24 hours ago).
  348. Closes ticket 20539.
  349. - Make it easier to change the output sort order of fallbacks.
  350. Closes ticket 20822.
  351. - Reduce the minimum fallback bandwidth to 1 MByte/s. Part of
  352. ticket 18828.
  353. - Require fallback directories to have the same address and port for
  354. 7 days (now that we have enough relays with this stability).
  355. Relays whose OnionOO stability timer is reset on restart by bug
  356. 18050 should upgrade to Tor 0.2.8.7 or later, which has a fix for
  357. this issue. Closes ticket 20880; maintains short-term fix
  358. in 0.2.8.2-alpha.
  359. - Require fallbacks to have flags for 90% of the time (weighted
  360. decaying average), rather than 95%. This allows at least 73% of
  361. clients to bootstrap in the first 5 seconds without contacting an
  362. authority. Part of ticket 18828.
  363. - Select 200 fallback directories for each release. Closes
  364. ticket 20881.
  365. o Minor features (fingerprinting resistence, authentication):
  366. - Extend the length of RSA keys used for TLS link authentication to
  367. 2048 bits. (These weren't used for forward secrecy; for forward
  368. secrecy, we used P256.) Closes ticket 13752.
  369. o Minor features (geoip):
  370. - Update geoip and geoip6 to the April 4 2017 Maxmind GeoLite2
  371. Country database.
  372. o Minor features (geoip, also in 0.2.9.9):
  373. - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
  374. Country database.
  375. o Minor features (infrastructure):
  376. - Implement smartlist_add_strdup() function. Replaces the use of
  377. smartlist_add(sl, tor_strdup(str)). Closes ticket 20048.
  378. o Minor features (linting):
  379. - Enhance the changes file linter to warn on Tor versions that are
  380. prefixed with "tor-". Closes ticket 21096.
  381. o Minor features (logging):
  382. - In several places, describe unset ed25519 keys as "<unset>",
  383. rather than the scary "AAAAAAAA...AAA". Closes ticket 21037.
  384. o Minor features (portability, compilation):
  385. - Autoconf now checks to determine if OpenSSL structures are opaque,
  386. instead of explicitly checking for OpenSSL version numbers. Part
  387. of ticket 21359.
  388. - Support building with recent LibreSSL code that uses opaque
  389. structures. Closes ticket 21359.
  390. o Minor features (relay):
  391. - We now allow separation of exit and relay traffic to different
  392. source IP addresses, using the OutboundBindAddressExit and
  393. OutboundBindAddressOR options respectively. Closes ticket 17975.
  394. Written by Michael Sonntag.
  395. o Minor features (reliability, crash):
  396. - Try better to detect problems in buffers where they might grow (or
  397. think they have grown) over 2 GB in size. Diagnostic for
  398. bug 21369.
  399. o Minor features (testing):
  400. - During 'make test-network-all', if tor logs any warnings, ask
  401. chutney to output them. Requires a recent version of chutney with
  402. the 21572 patch. Implements 21570.
  403. o Minor bugfix (control protocol):
  404. - The reply to a "GETINFO config/names" request via the control
  405. protocol now spells the type "Dependent" correctly. This is a
  406. breaking change in the control protocol. (The field seems to be
  407. ignored by the most common known controllers.) Fixes bug 18146;
  408. bugfix on 0.1.1.4-alpha.
  409. - The GETINFO extra-info/digest/<digest> command was broken because
  410. of a wrong base16 decode return value check, introduced when
  411. refactoring that API. Fixes bug 22034; bugfix on 0.2.9.1-alpha.
  412. o Minor bugfix (logging):
  413. - Don't recommend the use of Tor2web in non-anonymous mode.
  414. Recommending Tor2web is a bad idea because the client loses all
  415. anonymity. Tor2web should only be used in specific cases by users
  416. who *know* and understand the issues. Fixes bug 21294; bugfix
  417. on 0.2.9.3-alpha.
  418. o Minor bugfixes (bug resilience):
  419. - Fix an unreachable size_t overflow in base64_decode(). Fixes bug
  420. 19222; bugfix on 0.2.0.9-alpha. Found by Guido Vranken; fixed by
  421. Hans Jerry Illikainen.
  422. o Minor bugfixes (build):
  423. - Replace obsolete Autoconf macros with their modern equivalent and
  424. prevent similar issues in the future. Fixes bug 20990; bugfix
  425. on 0.1.0.1-rc.
  426. o Minor bugfixes (certificate expiration time):
  427. - Avoid using link certificates that don't become valid till some
  428. time in the future. Fixes bug 21420; bugfix on 0.2.4.11-alpha
  429. o Minor bugfixes (client):
  430. - Always recover from failures in extend_info_from_node(), in an
  431. attempt to prevent any recurrence of bug 21242. Fixes bug 21372;
  432. bugfix on 0.2.3.1-alpha.
  433. - When clients that use bridges start up with a cached consensus on
  434. disk, they were ignoring it and downloading a new one. Now they
  435. use the cached one. Fixes bug 20269; bugfix on 0.2.3.12-alpha.
  436. o Minor bugfixes (code correctness):
  437. - Repair a couple of (unreachable or harmless) cases of the risky
  438. comparison-by-subtraction pattern that caused bug 21278.
  439. o Minor bugfixes (config):
  440. - Don't assert on startup when trying to get the options list and
  441. LearnCircuitBuildTimeout is set to 0: we are currently parsing the
  442. options so of course they aren't ready yet. Fixes bug 21062;
  443. bugfix on 0.2.9.3-alpha.
  444. o Minor bugfixes (configuration):
  445. - Accept non-space whitespace characters after the severity level in
  446. the `Log` option. Fixes bug 19965; bugfix on 0.2.1.1-alpha.
  447. - Support "TByte" and "TBytes" units in options given in bytes.
  448. "TB", "terabyte(s)", "TBit(s)" and "terabit(s)" were already
  449. supported. Fixes bug 20622; bugfix on 0.2.0.14-alpha.
  450. o Minor bugfixes (configure, autoconf):
  451. - Rename the configure option --enable-expensive-hardening to
  452. --enable-fragile-hardening. Expensive hardening makes the tor
  453. daemon abort when some kinds of issues are detected. Thus, it
  454. makes tor more at risk of remote crashes but safer against RCE or
  455. heartbleed bug category. We now try to explain this issue in a
  456. message from the configure script. Fixes bug 21290; bugfix
  457. on 0.2.5.4-alpha.
  458. o Minor bugfixes (consensus weight):
  459. - Add new consensus method that initializes bw weights to 1 instead
  460. of 0. This prevents a zero weight from making it all the way to
  461. the end (happens in small testing networks) and causing an error.
  462. Fixes bug 14881; bugfix on 0.2.2.17-alpha.
  463. o Minor bugfixes (crash prevention):
  464. - Fix an (currently untriggerable, but potentially dangerous) crash
  465. bug when base32-encoding inputs whose sizes are not a multiple of
  466. 5. Fixes bug 21894; bugfix on 0.2.9.1-alpha.
  467. o Minor bugfixes (dead code):
  468. - Remove a redundant check for PidFile changes at runtime in
  469. options_transition_allowed(): this check is already performed
  470. regardless of whether the sandbox is active. Fixes bug 21123;
  471. bugfix on 0.2.5.4-alpha.
  472. o Minor bugfixes (descriptors):
  473. - Correctly recognise downloaded full descriptors as valid, even
  474. when using microdescriptors as circuits. This affects clients with
  475. FetchUselessDescriptors set, and may affect directory authorities.
  476. Fixes bug 20839; bugfix on 0.2.3.2-alpha.
  477. o Minor bugfixes (directory mirrors):
  478. - Allow relays to use directory mirrors without a DirPort: these
  479. relays need to be contacted over their ORPorts using a begindir
  480. connection. Fixes one case of bug 20711; bugfix on 0.2.8.2-alpha.
  481. - Clarify the message logged when a remote relay is unexpectedly
  482. missing an ORPort or DirPort: users were confusing this with a
  483. local port. Fixes another case of bug 20711; bugfix
  484. on 0.2.8.2-alpha.
  485. o Minor bugfixes (directory system):
  486. - Bridges and relays now use microdescriptors (like clients do)
  487. rather than old-style router descriptors. Now bridges will blend
  488. in with clients in terms of the circuits they build. Fixes bug
  489. 6769; bugfix on 0.2.3.2-alpha.
  490. - Download all consensus flavors, descriptors, and authority
  491. certificates when FetchUselessDescriptors is set, regardless of
  492. whether tor is a directory cache or not. Fixes bug 20667; bugfix
  493. on all recent tor versions.
  494. o Minor bugfixes (documentation):
  495. - Update the tor manual page to document every option that can not
  496. be changed while tor is running. Fixes bug 21122.
  497. o Minor bugfixes (ed25519 certificates):
  498. - Correctly interpret ed25519 certificates that would expire some
  499. time after 19 Jan 2038. Fixes bug 20027; bugfix on 0.2.7.2-alpha.
  500. o Minor bugfixes (fallback directories):
  501. - Avoid checking fallback candidates' DirPorts if they are down in
  502. OnionOO. When a relay operator has multiple relays, this
  503. prioritizes relays that are up over relays that are down. Fixes
  504. bug 20926; bugfix on 0.2.8.3-alpha.
  505. - Stop failing when OUTPUT_COMMENTS is True in updateFallbackDirs.py.
  506. Fixes bug 20877; bugfix on 0.2.8.3-alpha.
  507. - Stop failing when a relay has no uptime data in
  508. updateFallbackDirs.py. Fixes bug 20945; bugfix on 0.2.8.1-alpha.
  509. o Minor bugfixes (hidden service):
  510. - Clean up the code for expiring intro points with no associated
  511. circuits. It was causing, rarely, a service with some expiring
  512. introduction points to not open enough additional introduction
  513. points. Fixes part of bug 21302; bugfix on 0.2.7.2-alpha.
  514. - Resolve two possible underflows which could lead to creating and
  515. closing a lot of introduction point circuits in a non-stop loop.
  516. Fixes bug 21302; bugfix on 0.2.7.2-alpha.
  517. - Stop setting the torrc option HiddenServiceStatistics to "0" just
  518. because we're not a bridge or relay. Instead, we preserve whatever
  519. value the user set (or didn't set). Fixes bug 21150; bugfix
  520. on 0.2.6.2-alpha.
  521. o Minor bugfixes (hidden services):
  522. - Make hidden services check for failed intro point connections,
  523. even when they have exceeded their intro point creation limit.
  524. Fixes bug 21596; bugfix on 0.2.7.2-alpha. Reported by Alec Muffett.
  525. - Make hidden services with 8 to 10 introduction points check for
  526. failed circuits immediately after startup. Previously, they would
  527. wait for 5 minutes before performing their first checks. Fixes bug
  528. 21594; bugfix on 0.2.3.9-alpha. Reported by Alec Muffett.
  529. - Stop ignoring misconfigured hidden services. Instead, refuse to
  530. start tor until the misconfigurations have been corrected. Fixes
  531. bug 20559; bugfix on multiple commits in 0.2.7.1-alpha
  532. and earlier.
  533. o Minor bugfixes (IPv6):
  534. - Make IPv6-using clients try harder to find an IPv6 directory
  535. server. Fixes bug 20999; bugfix on 0.2.8.2-alpha.
  536. - When IPv6 addresses have not been downloaded yet (microdesc
  537. consensus documents don't list relay IPv6 addresses), use hard-
  538. coded addresses for authorities, fallbacks, and configured
  539. bridges. Now IPv6-only clients can use microdescriptors. Fixes bug
  540. 20996; bugfix on b167e82 from 19608 in 0.2.8.5-alpha.
  541. o Minor bugfixes (memory leak at exit):
  542. - Fix a small harmless memory leak at exit of the previously unused
  543. RSA->Ed identity cross-certificate. Fixes bug 17779; bugfix
  544. on 0.2.7.2-alpha.
  545. o Minor bugfixes (onion services):
  546. - Allow the number of introduction points to be as low as 0, rather
  547. than as low as 3. Fixes bug 21033; bugfix on 0.2.7.2-alpha.
  548. o Minor bugfixes (portability):
  549. - Use "OpenBSD" compiler macro instead of "OPENBSD" or "__OpenBSD__".
  550. It is supported by OpenBSD itself, and also by most OpenBSD
  551. variants (such as Bitrig). Fixes bug 20980; bugfix
  552. on 0.1.2.1-alpha.
  553. o Minor bugfixes (portability, also in 0.2.9.9):
  554. - Avoid crashing when Tor is built using headers that contain
  555. CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
  556. without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
  557. on 0.2.9.1-alpha.
  558. - Fix Libevent detection on platforms without Libevent 1 headers
  559. installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
  560. o Minor bugfixes (relay):
  561. - Avoid a double-marked-circuit warning that could happen when we
  562. receive DESTROY cells under heavy load. Fixes bug 20059; bugfix
  563. on 0.1.0.1-rc.
  564. - Honor DataDirectoryGroupReadable when tor is a relay. Previously,
  565. initializing the keys would reset the DataDirectory to 0700
  566. instead of 0750 even if DataDirectoryGroupReadable was set to 1.
  567. Fixes bug 19953; bugfix on 0.0.2pre16. Patch by "redfish".
  568. o Minor bugfixes (testing):
  569. - Fix Raspbian build issues related to missing socket errno in
  570. test_util.c. Fixes bug 21116; bugfix on 0.2.8.2. Patch by "hein".
  571. - Remove undefined behavior from the backtrace generator by removing
  572. its signal handler. Fixes bug 21026; bugfix on 0.2.5.2-alpha.
  573. - Use bash in src/test/test-network.sh. This ensures we reliably
  574. call chutney's newer tools/test-network.sh when available. Fixes
  575. bug 21562; bugfix on 0.2.9.1-alpha.
  576. o Minor bugfixes (tor-resolve):
  577. - The tor-resolve command line tool now rejects hostnames over 255
  578. characters in length. Previously, it would silently truncate them,
  579. which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
  580. Patch by "junglefowl".
  581. o Minor bugfixes (unit tests):
  582. - Allow the unit tests to pass even when DNS lookups of bogus
  583. addresses do not fail as expected. Fixes bug 20862 and 20863;
  584. bugfix on unit tests introduced in 0.2.8.1-alpha
  585. through 0.2.9.4-alpha.
  586. o Minor bugfixes (util):
  587. - When finishing writing a file to disk, if we were about to replace
  588. the file with the temporary file created before and we fail to
  589. replace it, remove the temporary file so it doesn't stay on disk.
  590. Fixes bug 20646; bugfix on 0.2.0.7-alpha. Patch by fk.
  591. o Minor bugfixes (Windows services):
  592. - Be sure to initialize the monotonic time subsystem before using
  593. it, even when running as an NT service. Fixes bug 21356; bugfix
  594. on 0.2.9.1-alpha.
  595. o Minor bugfixes (Windows):
  596. - Check for getpagesize before using it to mmap files. This fixes
  597. compilation in some MinGW environments. Fixes bug 20530; bugfix on
  598. 0.1.2.1-alpha. Reported by "ice".
  599. o Code simplification and refactoring:
  600. - Abolish all global guard context in entrynodes.c; replace with new
  601. guard_selection_t structure as preparation for proposal 271.
  602. Closes ticket 19858.
  603. - Extract magic numbers in circuituse.c into defined variables.
  604. - Introduce rend_service_is_ephemeral() that tells if given onion
  605. service is ephemeral. Replace unclear NULL-checkings for service
  606. directory with this function. Closes ticket 20526.
  607. - Refactor circuit_is_available_for_use to remove unnecessary check.
  608. - Refactor circuit_predict_and_launch_new for readability and
  609. testability. Closes ticket 18873.
  610. - Refactor code to manipulate global_origin_circuit_list into
  611. separate functions. Closes ticket 20921.
  612. - Refactor large if statement in purpose_needs_anonymity to use
  613. switch statement instead. Closes part of ticket 20077.
  614. - Refactor the hashing API to return negative values for errors, as
  615. is done as throughout the codebase. Closes ticket 20717.
  616. - Remove data structures that were used to index or_connection
  617. objects by their RSA identity digests. These structures are fully
  618. redundant with the similar structures used in the
  619. channel abstraction.
  620. - Remove duplicate code in the channel_write_*cell() functions.
  621. Closes ticket 13827; patch from Pingl.
  622. - Remove redundant behavior of is_sensitive_dir_purpose, refactor to
  623. use only purpose_needs_anonymity. Closes part of ticket 20077.
  624. - The code to generate and parse EXTEND and EXTEND2 cells has been
  625. replaced with code automatically generated by the
  626. "trunnel" utility.
  627. o Documentation (formatting):
  628. - Clean up formatting of tor.1 man page and HTML doc, where <pre>
  629. blocks were incorrectly appearing. Closes ticket 20885.
  630. o Documentation (man page):
  631. - Clarify many options in tor.1 and add some min/max values for
  632. HiddenService options. Closes ticket 21058.
  633. o Documentation:
  634. - Change '1' to 'weight_scale' in consensus bw weights calculation
  635. comments, as that is reality. Closes ticket 20273. Patch
  636. from pastly.
  637. - Clarify that when ClientRejectInternalAddresses is enabled (which
  638. is the default), multicast DNS hostnames for machines on the local
  639. network (of the form *.local) are also rejected. Closes
  640. ticket 17070.
  641. - Correct the value for AuthDirGuardBWGuarantee in the manpage, from
  642. 250 KBytes to 2 MBytes. Fixes bug 20435; bugfix on 0.2.5.6-alpha.
  643. - Include the "TBits" unit in Tor's man page. Fixes part of bug
  644. 20622; bugfix on 0.2.5.1-alpha.
  645. - Small fixes to the fuzzing documentation. Closes ticket 21472.
  646. - Stop the man page from incorrectly stating that HiddenServiceDir
  647. must already exist. Fixes 20486.
  648. - Update the description of the directory server options in the
  649. manual page, to clarify that a relay no longer needs to set
  650. DirPort in order to be a directory cache. Closes ticket 21720.
  651. o Removed features:
  652. - The AuthDirMaxServersPerAuthAddr option no longer exists: The same
  653. limit for relays running on a single IP applies to authority IP
  654. addresses as well as to non-authority IP addresses. Closes
  655. ticket 20960.
  656. - The UseDirectoryGuards torrc option no longer exists: all users
  657. that use entry guards will also use directory guards. Related to
  658. proposal 271; implements part of ticket 20831.
  659. o Testing:
  660. - Add tests for networkstatus_compute_bw_weights_v10.
  661. - Add unit tests circuit_predict_and_launch_new.
  662. - Extract dummy_origin_circuit_new so it can be used by other
  663. test functions.
  664. - New unit tests for tor_htonll(). Closes ticket 19563. Patch
  665. from "overcaffeinated".
  666. - Perform the coding style checks when running the tests and fail
  667. when coding style violations are found. Closes ticket 5500.
  668. Changes in version 0.2.8.13 - 2017-03-03
  669. Tor 0.2.8.13 backports a security fix from later Tor
  670. releases. Anybody running Tor 0.2.8.12 or earlier should upgrade to this
  671. this release, if for some reason they cannot upgrade to a later
  672. release series, and if they build Tor with the --enable-expensive-hardening
  673. option.
  674. Note that support for Tor 0.2.8.x is ending next year: we will not issue
  675. any fixes for the Tor 0.2.8.x series after 1 Jan 2018. If you need
  676. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  677. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  678. - Fix an integer underflow bug when comparing malformed Tor
  679. versions. This bug could crash Tor when built with
  680. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  681. 0.2.9.8, which were built with -ftrapv by default. In other cases
  682. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  683. on 0.0.8pre1. Found by OSS-Fuzz.
  684. o Minor features (geoip):
  685. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  686. Country database.
  687. Changes in version 0.2.7.7 - 2017-03-03
  688. Tor 0.2.7.7 backports a number of security fixes from later Tor
  689. releases. Anybody running Tor 0.2.7.6 or earlier should upgrade to
  690. this release, if for some reason they cannot upgrade to a later
  691. release series.
  692. Note that support for Tor 0.2.7.x is ending this year: we will not issue
  693. any fixes for the Tor 0.2.7.x series after 1 August 2017. If you need
  694. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  695. o Directory authority changes (backport from 0.2.8.5-rc):
  696. - Urras is no longer a directory authority. Closes ticket 19271.
  697. o Directory authority changes (backport from 0.2.9.2-alpha):
  698. - The "Tonga" bridge authority has been retired; the new bridge
  699. authority is "Bifroest". Closes tickets 19728 and 19690.
  700. o Directory authority key updates (backport from 0.2.8.1-alpha):
  701. - Update the V3 identity key for the dannenberg directory authority:
  702. it was changed on 18 November 2015. Closes task 17906. Patch
  703. by "teor".
  704. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  705. - Fix a bug in parsing that could cause clients to read a single
  706. byte past the end of an allocated region. This bug could be used
  707. to cause hardened clients (built with --enable-expensive-hardening)
  708. to crash if they tried to visit a hostile hidden service. Non-
  709. hardened clients are only affected depending on the details of
  710. their platform's memory allocator. Fixes bug 21018; bugfix on
  711. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  712. 2016-12-002 and as CVE-2016-1254.
  713. o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
  714. - Stop a crash that could occur when a client running with DNSPort
  715. received a query with multiple address types, and the first
  716. address type was not supported. Found and fixed by Scott Dial.
  717. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  718. - Prevent a class of security bugs caused by treating the contents
  719. of a buffer chunk as if they were a NUL-terminated string. At
  720. least one such bug seems to be present in all currently used
  721. versions of Tor, and would allow an attacker to remotely crash
  722. most Tor instances, especially those compiled with extra compiler
  723. hardening. With this defense in place, such bugs can't crash Tor,
  724. though we should still fix them as they occur. Closes ticket
  725. 20384 (TROVE-2016-10-001).
  726. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  727. - Avoid a difficult-to-trigger heap corruption attack when extending
  728. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  729. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  730. Reported by Guido Vranken.
  731. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  732. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  733. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  734. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  735. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  736. pointer to the previous (uninitialized) key value. The impact here
  737. should be limited to a difficult-to-trigger crash, if OpenSSL is
  738. running an engine that makes key generation failures possible, or
  739. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  740. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  741. Baishakhi Ray.
  742. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  743. - Fix an integer underflow bug when comparing malformed Tor
  744. versions. This bug could crash Tor when built with
  745. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  746. 0.2.9.8, which were built with -ftrapv by default. In other cases
  747. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  748. on 0.0.8pre1. Found by OSS-Fuzz.
  749. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  750. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  751. zero size. Check size argument to memwipe() for underflow. Fixes
  752. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  753. patch by "teor".
  754. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  755. - Make Tor survive errors involving connections without a
  756. corresponding event object. Previously we'd fail with an
  757. assertion; now we produce a log message. Related to bug 16248.
  758. o Minor features (geoip):
  759. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  760. Country database.
  761. Changes in version 0.2.6.11 - 2017-03-03
  762. Tor 0.2.6.11 backports a number of security fixes from later Tor
  763. releases. Anybody running Tor 0.2.6.10 or earlier should upgrade to
  764. this release, if for some reason they cannot upgrade to a later
  765. release series.
  766. Note that support for Tor 0.2.6.x is ending this year: we will not issue
  767. any fixes for the Tor 0.2.6.x series after 1 August 2017. If you need
  768. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  769. o Directory authority changes (backport from 0.2.8.5-rc):
  770. - Urras is no longer a directory authority. Closes ticket 19271.
  771. o Directory authority changes (backport from 0.2.9.2-alpha):
  772. - The "Tonga" bridge authority has been retired; the new bridge
  773. authority is "Bifroest". Closes tickets 19728 and 19690.
  774. o Directory authority key updates (backport from 0.2.8.1-alpha):
  775. - Update the V3 identity key for the dannenberg directory authority:
  776. it was changed on 18 November 2015. Closes task 17906. Patch
  777. by "teor".
  778. o Major features (security fixes, backport from 0.2.9.4-alpha):
  779. - Prevent a class of security bugs caused by treating the contents
  780. of a buffer chunk as if they were a NUL-terminated string. At
  781. least one such bug seems to be present in all currently used
  782. versions of Tor, and would allow an attacker to remotely crash
  783. most Tor instances, especially those compiled with extra compiler
  784. hardening. With this defense in place, such bugs can't crash Tor,
  785. though we should still fix them as they occur. Closes ticket
  786. 20384 (TROVE-2016-10-001).
  787. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  788. - Fix a bug in parsing that could cause clients to read a single
  789. byte past the end of an allocated region. This bug could be used
  790. to cause hardened clients (built with --enable-expensive-hardening)
  791. to crash if they tried to visit a hostile hidden service. Non-
  792. hardened clients are only affected depending on the details of
  793. their platform's memory allocator. Fixes bug 21018; bugfix on
  794. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  795. 2016-12-002 and as CVE-2016-1254.
  796. o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
  797. - Stop a crash that could occur when a client running with DNSPort
  798. received a query with multiple address types, and the first
  799. address type was not supported. Found and fixed by Scott Dial.
  800. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  801. o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
  802. - Fix an error that could cause us to read 4 bytes before the
  803. beginning of an openssl string. This bug could be used to cause
  804. Tor to crash on systems with unusual malloc implementations, or
  805. systems with unusual hardening installed. Fixes bug 17404; bugfix
  806. on 0.2.3.6-alpha.
  807. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  808. - Avoid a difficult-to-trigger heap corruption attack when extending
  809. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  810. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  811. Reported by Guido Vranken.
  812. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  813. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  814. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  815. o Major bugfixes (guard selection, backport from 0.2.7.6):
  816. - Actually look at the Guard flag when selecting a new directory
  817. guard. When we implemented the directory guard design, we
  818. accidentally started treating all relays as if they have the Guard
  819. flag during guard selection, leading to weaker anonymity and worse
  820. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  821. by Mohsen Imani.
  822. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  823. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  824. pointer to the previous (uninitialized) key value. The impact here
  825. should be limited to a difficult-to-trigger crash, if OpenSSL is
  826. running an engine that makes key generation failures possible, or
  827. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  828. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  829. Baishakhi Ray.
  830. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  831. - Fix an integer underflow bug when comparing malformed Tor
  832. versions. This bug could crash Tor when built with
  833. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  834. 0.2.9.8, which were built with -ftrapv by default. In other cases
  835. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  836. on 0.0.8pre1. Found by OSS-Fuzz.
  837. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  838. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  839. zero size. Check size argument to memwipe() for underflow. Fixes
  840. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  841. patch by "teor".
  842. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  843. - Make Tor survive errors involving connections without a
  844. corresponding event object. Previously we'd fail with an
  845. assertion; now we produce a log message. Related to bug 16248.
  846. o Minor features (geoip):
  847. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  848. Country database.
  849. o Minor bugfixes (compilation, backport from 0.2.7.6):
  850. - Fix a compilation warning with Clang 3.6: Do not check the
  851. presence of an address which can never be NULL. Fixes bug 17781.
  852. Changes in version 0.2.5.13 - 2017-03-03
  853. Tor 0.2.5.13 backports a number of security fixes from later Tor
  854. releases. Anybody running Tor 0.2.5.13 or earlier should upgrade to
  855. this release, if for some reason they cannot upgrade to a later
  856. release series.
  857. Note that support for Tor 0.2.5.x is ending next year: we will not issue
  858. any fixes for the Tor 0.2.5.x series after 1 May 2018. If you need
  859. a Tor release series with longer-term support, we recommend Tor 0.2.9.x.
  860. o Directory authority changes (backport from 0.2.8.5-rc):
  861. - Urras is no longer a directory authority. Closes ticket 19271.
  862. o Directory authority changes (backport from 0.2.9.2-alpha):
  863. - The "Tonga" bridge authority has been retired; the new bridge
  864. authority is "Bifroest". Closes tickets 19728 and 19690.
  865. o Directory authority key updates (backport from 0.2.8.1-alpha):
  866. - Update the V3 identity key for the dannenberg directory authority:
  867. it was changed on 18 November 2015. Closes task 17906. Patch
  868. by "teor".
  869. o Major features (security fixes, backport from 0.2.9.4-alpha):
  870. - Prevent a class of security bugs caused by treating the contents
  871. of a buffer chunk as if they were a NUL-terminated string. At
  872. least one such bug seems to be present in all currently used
  873. versions of Tor, and would allow an attacker to remotely crash
  874. most Tor instances, especially those compiled with extra compiler
  875. hardening. With this defense in place, such bugs can't crash Tor,
  876. though we should still fix them as they occur. Closes ticket
  877. 20384 (TROVE-2016-10-001).
  878. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  879. - Fix a bug in parsing that could cause clients to read a single
  880. byte past the end of an allocated region. This bug could be used
  881. to cause hardened clients (built with --enable-expensive-hardening)
  882. to crash if they tried to visit a hostile hidden service. Non-
  883. hardened clients are only affected depending on the details of
  884. their platform's memory allocator. Fixes bug 21018; bugfix on
  885. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  886. 2016-12-002 and as CVE-2016-1254.
  887. o Major bugfixes (security, client, DNS proxy, backport from 0.2.8.3-alpha):
  888. - Stop a crash that could occur when a client running with DNSPort
  889. received a query with multiple address types, and the first
  890. address type was not supported. Found and fixed by Scott Dial.
  891. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  892. o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
  893. - Fix an error that could cause us to read 4 bytes before the
  894. beginning of an openssl string. This bug could be used to cause
  895. Tor to crash on systems with unusual malloc implementations, or
  896. systems with unusual hardening installed. Fixes bug 17404; bugfix
  897. on 0.2.3.6-alpha.
  898. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  899. - Avoid a difficult-to-trigger heap corruption attack when extending
  900. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  901. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  902. Reported by Guido Vranken.
  903. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  904. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  905. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  906. o Major bugfixes (guard selection, backport from 0.2.7.6):
  907. - Actually look at the Guard flag when selecting a new directory
  908. guard. When we implemented the directory guard design, we
  909. accidentally started treating all relays as if they have the Guard
  910. flag during guard selection, leading to weaker anonymity and worse
  911. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  912. by Mohsen Imani.
  913. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  914. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  915. pointer to the previous (uninitialized) key value. The impact here
  916. should be limited to a difficult-to-trigger crash, if OpenSSL is
  917. running an engine that makes key generation failures possible, or
  918. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  919. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  920. Baishakhi Ray.
  921. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  922. - Fix an integer underflow bug when comparing malformed Tor
  923. versions. This bug could crash Tor when built with
  924. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  925. 0.2.9.8, which were built with -ftrapv by default. In other cases
  926. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  927. on 0.0.8pre1. Found by OSS-Fuzz.
  928. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  929. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  930. zero size. Check size argument to memwipe() for underflow. Fixes
  931. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  932. patch by "teor".
  933. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  934. - Make Tor survive errors involving connections without a
  935. corresponding event object. Previously we'd fail with an
  936. assertion; now we produce a log message. Related to bug 16248.
  937. o Minor features (geoip):
  938. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  939. Country database.
  940. o Minor bugfixes (compilation, backport from 0.2.7.6):
  941. - Fix a compilation warning with Clang 3.6: Do not check the
  942. presence of an address which can never be NULL. Fixes bug 17781.
  943. o Minor bugfixes (crypto error-handling, backport from 0.2.7.2-alpha):
  944. - Check for failures from crypto_early_init, and refuse to continue.
  945. A previous typo meant that we could keep going with an
  946. uninitialized crypto library, and would have OpenSSL initialize
  947. its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
  948. when implementing ticket 4900. Patch by "teor".
  949. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  950. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  951. a client authorized hidden service. Fixes bug 15823; bugfix
  952. on 0.2.1.6-alpha.
  953. Changes in version 0.2.4.28 - 2017-03-03
  954. Tor 0.2.4.28 backports a number of security fixes from later Tor
  955. releases. Anybody running Tor 0.2.4.27 or earlier should upgrade to
  956. this release, if for some reason they cannot upgrade to a later
  957. release series.
  958. Note that support for Tor 0.2.4.x is ending soon: we will not issue
  959. any fixes for the Tor 0.2.4.x series after 1 August 2017. If you need
  960. a Tor release series with long-term support, we recommend Tor 0.2.9.x.
  961. o Directory authority changes (backport from 0.2.8.5-rc):
  962. - Urras is no longer a directory authority. Closes ticket 19271.
  963. o Directory authority changes (backport from 0.2.9.2-alpha):
  964. - The "Tonga" bridge authority has been retired; the new bridge
  965. authority is "Bifroest". Closes tickets 19728 and 19690.
  966. o Directory authority key updates (backport from 0.2.8.1-alpha):
  967. - Update the V3 identity key for the dannenberg directory authority:
  968. it was changed on 18 November 2015. Closes task 17906. Patch
  969. by "teor".
  970. o Major features (security fixes, backport from 0.2.9.4-alpha):
  971. - Prevent a class of security bugs caused by treating the contents
  972. of a buffer chunk as if they were a NUL-terminated string. At
  973. least one such bug seems to be present in all currently used
  974. versions of Tor, and would allow an attacker to remotely crash
  975. most Tor instances, especially those compiled with extra compiler
  976. hardening. With this defense in place, such bugs can't crash Tor,
  977. though we should still fix them as they occur. Closes ticket
  978. 20384 (TROVE-2016-10-001).
  979. o Major bugfixes (parsing, security, backport from 0.2.9.8):
  980. - Fix a bug in parsing that could cause clients to read a single
  981. byte past the end of an allocated region. This bug could be used
  982. to cause hardened clients (built with --enable-expensive-hardening)
  983. to crash if they tried to visit a hostile hidden service. Non-
  984. hardened clients are only affected depending on the details of
  985. their platform's memory allocator. Fixes bug 21018; bugfix on
  986. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  987. 2016-12-002 and as CVE-2016-1254.
  988. o Major bugfixes (security, correctness, backport from 0.2.7.4-rc):
  989. - Fix an error that could cause us to read 4 bytes before the
  990. beginning of an openssl string. This bug could be used to cause
  991. Tor to crash on systems with unusual malloc implementations, or
  992. systems with unusual hardening installed. Fixes bug 17404; bugfix
  993. on 0.2.3.6-alpha.
  994. o Major bugfixes (security, pointers, backport from 0.2.8.2-alpha):
  995. - Avoid a difficult-to-trigger heap corruption attack when extending
  996. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  997. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  998. Reported by Guido Vranken.
  999. o Major bugfixes (dns proxy mode, crash, backport from 0.2.8.2-alpha):
  1000. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  1001. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  1002. o Major bugfixes (guard selection, backport from 0.2.7.6):
  1003. - Actually look at the Guard flag when selecting a new directory
  1004. guard. When we implemented the directory guard design, we
  1005. accidentally started treating all relays as if they have the Guard
  1006. flag during guard selection, leading to weaker anonymity and worse
  1007. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  1008. by Mohsen Imani.
  1009. o Major bugfixes (key management, backport from 0.2.8.3-alpha):
  1010. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  1011. pointer to the previous (uninitialized) key value. The impact here
  1012. should be limited to a difficult-to-trigger crash, if OpenSSL is
  1013. running an engine that makes key generation failures possible, or
  1014. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  1015. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  1016. Baishakhi Ray.
  1017. o Major bugfixes (parsing, backported from 0.3.0.4-rc):
  1018. - Fix an integer underflow bug when comparing malformed Tor
  1019. versions. This bug could crash Tor when built with
  1020. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  1021. 0.2.9.8, which were built with -ftrapv by default. In other cases
  1022. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  1023. on 0.0.8pre1. Found by OSS-Fuzz.
  1024. o Minor features (security, memory erasure, backport from 0.2.8.1-alpha):
  1025. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  1026. zero size. Check size argument to memwipe() for underflow. Fixes
  1027. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  1028. patch by "teor".
  1029. o Minor features (bug-resistance, backport from 0.2.8.2-alpha):
  1030. - Make Tor survive errors involving connections without a
  1031. corresponding event object. Previously we'd fail with an
  1032. assertion; now we produce a log message. Related to bug 16248.
  1033. o Minor features (DoS-resistance, backport from 0.2.7.1-alpha):
  1034. - Make it harder for attackers to overload hidden services with
  1035. introductions, by blocking multiple introduction requests on the
  1036. same circuit. Resolves ticket 15515.
  1037. o Minor features (geoip):
  1038. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  1039. Country database.
  1040. o Minor bugfixes (compilation, backport from 0.2.7.6):
  1041. - Fix a compilation warning with Clang 3.6: Do not check the
  1042. presence of an address which can never be NULL. Fixes bug 17781.
  1043. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  1044. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  1045. a client authorized hidden service. Fixes bug 15823; bugfix
  1046. on 0.2.1.6-alpha.
  1047. Changes in version 0.2.9.10 - 2017-03-01
  1048. Tor 0.2.9.10 backports a security fix from later Tor release. It also
  1049. includes fixes for some major issues affecting directory authorities,
  1050. LibreSSL compatibility, and IPv6 correctness.
  1051. The Tor 0.2.9.x release series is now marked as a long-term-support
  1052. series. We intend to backport security fixes to 0.2.9.x until at
  1053. least January of 2020.
  1054. o Major bugfixes (directory authority, 0.3.0.3-alpha):
  1055. - During voting, when marking a relay as a probable sybil, do not
  1056. clear its BadExit flag: sybils can still be bad in other ways
  1057. too. (We still clear the other flags.) Fixes bug 21108; bugfix
  1058. on 0.2.0.13-alpha.
  1059. o Major bugfixes (IPv6 Exits, backport from 0.3.0.3-alpha):
  1060. - Stop rejecting all IPv6 traffic on Exits whose exit policy rejects
  1061. any IPv6 addresses. Instead, only reject a port over IPv6 if the
  1062. exit policy rejects that port on more than an IPv6 /16 of
  1063. addresses. This bug was made worse by 17027 in 0.2.8.1-alpha,
  1064. which rejected a relay's own IPv6 address by default. Fixes bug
  1065. 21357; bugfix on commit 004f3f4e53 in 0.2.4.7-alpha.
  1066. o Major bugfixes (parsing, also in 0.3.0.4-rc):
  1067. - Fix an integer underflow bug when comparing malformed Tor
  1068. versions. This bug could crash Tor when built with
  1069. --enable-expensive-hardening, or on Tor 0.2.9.1-alpha through Tor
  1070. 0.2.9.8, which were built with -ftrapv by default. In other cases
  1071. it was harmless. Part of TROVE-2017-001. Fixes bug 21278; bugfix
  1072. on 0.0.8pre1. Found by OSS-Fuzz.
  1073. o Minor features (directory authorities, also in 0.3.0.4-rc):
  1074. - Directory authorities now reject descriptors that claim to be
  1075. malformed versions of Tor. Helps prevent exploitation of
  1076. bug 21278.
  1077. - Reject version numbers with components that exceed INT32_MAX.
  1078. Otherwise 32-bit and 64-bit platforms would behave inconsistently.
  1079. Fixes bug 21450; bugfix on 0.0.8pre1.
  1080. o Minor features (geoip):
  1081. - Update geoip and geoip6 to the February 8 2017 Maxmind GeoLite2
  1082. Country database.
  1083. o Minor features (portability, compilation, backport from 0.3.0.3-alpha):
  1084. - Autoconf now checks to determine if OpenSSL structures are opaque,
  1085. instead of explicitly checking for OpenSSL version numbers. Part
  1086. of ticket 21359.
  1087. - Support building with recent LibreSSL code that uses opaque
  1088. structures. Closes ticket 21359.
  1089. o Minor bugfixes (code correctness, also in 0.3.0.4-rc):
  1090. - Repair a couple of (unreachable or harmless) cases of the risky
  1091. comparison-by-subtraction pattern that caused bug 21278.
  1092. o Minor bugfixes (tor-resolve, backport from 0.3.0.3-alpha):
  1093. - The tor-resolve command line tool now rejects hostnames over 255
  1094. characters in length. Previously, it would silently truncate them,
  1095. which could lead to bugs. Fixes bug 21280; bugfix on 0.0.9pre5.
  1096. Patch by "junglefowl".
  1097. Changes in version 0.2.9.9 - 2017-01-23
  1098. Tor 0.2.9.9 fixes a denial-of-service bug where an attacker could
  1099. cause relays and clients to crash, even if they were not built with
  1100. the --enable-expensive-hardening option. This bug affects all 0.2.9.x
  1101. versions, and also affects 0.3.0.1-alpha: all relays running an affected
  1102. version should upgrade.
  1103. This release also resolves a client-side onion service reachability
  1104. bug, and resolves a pair of small portability issues.
  1105. o Major bugfixes (security):
  1106. - Downgrade the "-ftrapv" option from "always on" to "only on when
  1107. --enable-expensive-hardening is provided." This hardening option,
  1108. like others, can turn survivable bugs into crashes -- and having
  1109. it on by default made a (relatively harmless) integer overflow bug
  1110. into a denial-of-service bug. Fixes bug 21278 (TROVE-2017-001);
  1111. bugfix on 0.2.9.1-alpha.
  1112. o Major bugfixes (client, onion service):
  1113. - Fix a client-side onion service reachability bug, where multiple
  1114. socks requests to an onion service (or a single slow request)
  1115. could cause us to mistakenly mark some of the service's
  1116. introduction points as failed, and we cache that failure so
  1117. eventually we run out and can't reach the service. Also resolves a
  1118. mysterious "Remote server sent bogus reason code 65021" log
  1119. warning. The bug was introduced in ticket 17218, where we tried to
  1120. remember the circuit end reason as a uint16_t, which mangled
  1121. negative values. Partially fixes bug 21056 and fixes bug 20307;
  1122. bugfix on 0.2.8.1-alpha.
  1123. o Minor features (geoip):
  1124. - Update geoip and geoip6 to the January 4 2017 Maxmind GeoLite2
  1125. Country database.
  1126. o Minor bugfixes (portability):
  1127. - Avoid crashing when Tor is built using headers that contain
  1128. CLOCK_MONOTONIC_COARSE, but then tries to run on an older kernel
  1129. without CLOCK_MONOTONIC_COARSE. Fixes bug 21035; bugfix
  1130. on 0.2.9.1-alpha.
  1131. - Fix Libevent detection on platforms without Libevent 1 headers
  1132. installed. Fixes bug 21051; bugfix on 0.2.9.1-alpha.
  1133. Changes in version 0.2.8.12 - 2016-12-19
  1134. Tor 0.2.8.12 backports a fix for a medium-severity issue (bug 21018
  1135. below) where Tor clients could crash when attempting to visit a
  1136. hostile hidden service. Clients are recommended to upgrade as packages
  1137. become available for their systems.
  1138. It also includes an updated list of fallback directories, backported
  1139. from 0.2.9.
  1140. Now that the Tor 0.2.9 series is stable, only major bugfixes will be
  1141. backported to 0.2.8 in the future.
  1142. o Major bugfixes (parsing, security, backported from 0.2.9.8):
  1143. - Fix a bug in parsing that could cause clients to read a single
  1144. byte past the end of an allocated region. This bug could be used
  1145. to cause hardened clients (built with --enable-expensive-hardening)
  1146. to crash if they tried to visit a hostile hidden service. Non-
  1147. hardened clients are only affected depending on the details of
  1148. their platform's memory allocator. Fixes bug 21018; bugfix on
  1149. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  1150. 2016-12-002 and as CVE-2016-1254.
  1151. o Minor features (fallback directory list, backported from 0.2.9.8):
  1152. - Replace the 81 remaining fallbacks of the 100 originally
  1153. introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
  1154. fallbacks (123 new, 54 existing, 27 removed) generated in December
  1155. 2016. Resolves ticket 20170.
  1156. o Minor features (geoip, backported from 0.2.9.7-rc):
  1157. - Update geoip and geoip6 to the December 7 2016 Maxmind GeoLite2
  1158. Country database.
  1159. Changes in version 0.2.9.8 - 2016-12-19
  1160. Tor 0.2.9.8 is the first stable release of the Tor 0.2.9 series.
  1161. The Tor 0.2.9 series makes mandatory a number of security features
  1162. that were formerly optional. It includes support for a new shared-
  1163. randomness protocol that will form the basis for next generation
  1164. hidden services, includes a single-hop hidden service mode for
  1165. optimizing .onion services that don't actually want to be hidden,
  1166. tries harder not to overload the directory authorities with excessive
  1167. downloads, and supports a better protocol versioning scheme for
  1168. improved compatibility with other implementations of the Tor protocol.
  1169. And of course, there are numerous other bugfixes and improvements.
  1170. This release also includes a fix for a medium-severity issue (bug
  1171. 21018 below) where Tor clients could crash when attempting to visit a
  1172. hostile hidden service. Clients are recommended to upgrade as packages
  1173. become available for their systems.
  1174. Below are listed the changes since Tor 0.2.8.11. For a list of
  1175. changes since 0.2.9.7-rc, see the ChangeLog file.
  1176. o New system requirements:
  1177. - When building with OpenSSL, Tor now requires version 1.0.1 or
  1178. later. OpenSSL 1.0.0 and earlier are no longer supported by the
  1179. OpenSSL team, and should not be used. Closes ticket 20303.
  1180. - Tor now requires Libevent version 2.0.10-stable or later. Older
  1181. versions of Libevent have less efficient backends for several
  1182. platforms, and lack the DNS code that we use for our server-side
  1183. DNS support. This implements ticket 19554.
  1184. - Tor now requires zlib version 1.2 or later, for security,
  1185. efficiency, and (eventually) gzip support. (Back when we started,
  1186. zlib 1.1 and zlib 1.0 were still found in the wild. 1.2 was
  1187. released in 2003. We recommend the latest version.)
  1188. o Deprecated features:
  1189. - A number of DNS-cache-related sub-options for client ports are now
  1190. deprecated for security reasons, and may be removed in a future
  1191. version of Tor. (We believe that client-side DNS caching is a bad
  1192. idea for anonymity, and you should not turn it on.) The options
  1193. are: CacheDNS, CacheIPv4DNS, CacheIPv6DNS, UseDNSCache,
  1194. UseIPv4Cache, and UseIPv6Cache.
  1195. - A number of options are deprecated for security reasons, and may
  1196. be removed in a future version of Tor. The options are:
  1197. AllowDotExit, AllowInvalidNodes, AllowSingleHopCircuits,
  1198. AllowSingleHopExits, ClientDNSRejectInternalAddresses,
  1199. CloseHSClientCircuitsImmediatelyOnTimeout,
  1200. CloseHSServiceRendCircuitsImmediatelyOnTimeout,
  1201. ExcludeSingleHopRelays, FastFirstHopPK, TLSECGroup,
  1202. UseNTorHandshake, and WarnUnsafeSocks.
  1203. - The *ListenAddress options are now deprecated as unnecessary: the
  1204. corresponding *Port options should be used instead. These options
  1205. may someday be removed. The affected options are:
  1206. ControlListenAddress, DNSListenAddress, DirListenAddress,
  1207. NATDListenAddress, ORListenAddress, SocksListenAddress,
  1208. and TransListenAddress.
  1209. o Major bugfixes (parsing, security, new since 0.2.9.7-rc):
  1210. - Fix a bug in parsing that could cause clients to read a single
  1211. byte past the end of an allocated region. This bug could be used
  1212. to cause hardened clients (built with --enable-expensive-hardening)
  1213. to crash if they tried to visit a hostile hidden service. Non-
  1214. hardened clients are only affected depending on the details of
  1215. their platform's memory allocator. Fixes bug 21018; bugfix on
  1216. 0.2.0.8-alpha. Found by using libFuzzer. Also tracked as TROVE-
  1217. 2016-12-002 and as CVE-2016-1254.
  1218. o Major features (build, hardening):
  1219. - Tor now builds with -ftrapv by default on compilers that support
  1220. it. This option detects signed integer overflow (which C forbids),
  1221. and turns it into a hard-failure. We do not apply this option to
  1222. code that needs to run in constant time to avoid side-channels;
  1223. instead, we use -fwrapv in that code. Closes ticket 17983.
  1224. - When --enable-expensive-hardening is selected, stop applying the
  1225. clang/gcc sanitizers to code that needs to run in constant time.
  1226. Although we are aware of no introduced side-channels, we are not
  1227. able to prove that there are none. Related to ticket 17983.
  1228. o Major features (circuit building, security):
  1229. - Authorities, relays, and clients now require ntor keys in all
  1230. descriptors, for all hops (except for rare hidden service protocol
  1231. cases), for all circuits, and for all other roles. Part of
  1232. ticket 19163.
  1233. - Authorities, relays, and clients only use ntor, except for
  1234. rare cases in the hidden service protocol. Part of ticket 19163.
  1235. o Major features (compilation):
  1236. - Our big list of extra GCC warnings is now enabled by default when
  1237. building with GCC (or with anything like Clang that claims to be
  1238. GCC-compatible). To make all warnings into fatal compilation
  1239. errors, pass --enable-fatal-warnings to configure. Closes
  1240. ticket 19044.
  1241. - Use the Autoconf macro AC_USE_SYSTEM_EXTENSIONS to automatically
  1242. turn on C and POSIX extensions. (Previously, we attempted to do
  1243. this on an ad hoc basis.) Closes ticket 19139.
  1244. o Major features (directory authorities, hidden services):
  1245. - Directory authorities can now perform the shared randomness
  1246. protocol specified by proposal 250. Using this protocol, directory
  1247. authorities generate a global fresh random value every day. In the
  1248. future, this value will be used by hidden services to select
  1249. HSDirs. This release implements the directory authority feature;
  1250. the hidden service side will be implemented in the future as part
  1251. of proposal 224. Resolves ticket 16943; implements proposal 250.
  1252. o Major features (downloading, random exponential backoff):
  1253. - When we fail to download an object from a directory service, wait
  1254. for an (exponentially increasing) randomized amount of time before
  1255. retrying, rather than a fixed interval as we did before. This
  1256. prevents a group of Tor instances from becoming too synchronized,
  1257. or a single Tor instance from becoming too predictable, in its
  1258. download schedule. Closes ticket 15942.
  1259. o Major features (resource management):
  1260. - Tor can now notice it is about to run out of sockets, and
  1261. preemptively close connections of lower priority. (This feature is
  1262. off by default for now, since the current prioritizing method is
  1263. yet not mature enough. You can enable it by setting
  1264. "DisableOOSCheck 0", but watch out: it might close some sockets
  1265. you would rather have it keep.) Closes ticket 18640.
  1266. o Major features (single-hop "hidden" services):
  1267. - Add experimental HiddenServiceSingleHopMode and
  1268. HiddenServiceNonAnonymousMode options. When both are set to 1,
  1269. every hidden service on that Tor instance becomes a non-anonymous
  1270. Single Onion Service. Single Onions make one-hop (direct)
  1271. connections to their introduction and rendezvous points. One-hop
  1272. circuits make Single Onion servers easily locatable, but clients
  1273. remain location-anonymous. This is compatible with the existing
  1274. hidden service implementation, and works on the current Tor
  1275. network without any changes to older relays or clients. Implements
  1276. proposal 260, completes ticket 17178. Patch by teor and asn.
  1277. o Major features (subprotocol versions):
  1278. - Tor directory authorities now vote on a set of recommended
  1279. "subprotocol versions", and on a set of required subprotocol
  1280. versions. Clients and relays that lack support for a _required_
  1281. subprotocol version will not start; those that lack support for a
  1282. _recommended_ subprotocol version will warn the user to upgrade.
  1283. This change allows compatible implementations of the Tor protocol(s)
  1284. to exist without pretending to be 100% bug-compatible with
  1285. particular releases of Tor itself. Closes ticket 19958; implements
  1286. part of proposal 264.
  1287. o Major bugfixes (circuit building):
  1288. - Hidden service client-to-intro-point and service-to-rendezvous-
  1289. point circuits use the TAP key supplied by the protocol, to avoid
  1290. epistemic attacks. Fixes bug 19163; bugfix on 0.2.4.18-rc.
  1291. o Major bugfixes (download scheduling):
  1292. - Avoid resetting download status for consensuses hourly, since we
  1293. already have another, smarter retry mechanism. Fixes bug 8625;
  1294. bugfix on 0.2.0.9-alpha.
  1295. - If a consensus expires while we are waiting for certificates to
  1296. download, stop waiting for certificates.
  1297. - If we stop waiting for certificates less than a minute after we
  1298. started downloading them, do not consider the certificate download
  1299. failure a separate failure. Fixes bug 20533; bugfix
  1300. on 0.2.0.9-alpha.
  1301. - When using exponential backoff in test networks, use a lower
  1302. exponent, so the delays do not vary as much. This helps test
  1303. networks bootstrap consistently. Fixes bug 20597; bugfix on 20499.
  1304. o Major bugfixes (exit policies):
  1305. - Avoid disclosing exit outbound bind addresses, configured port
  1306. bind addresses, and local interface addresses in relay descriptors
  1307. by default under ExitPolicyRejectPrivate. Instead, only reject
  1308. these (otherwise unlisted) addresses if
  1309. ExitPolicyRejectLocalInterfaces is set. Fixes bug 18456; bugfix on
  1310. 0.2.7.2-alpha. Patch by teor.
  1311. o Major bugfixes (hidden services):
  1312. - Allow Tor clients with appropriate controllers to work with
  1313. FetchHidServDescriptors set to 0. Previously, this option also
  1314. disabled descriptor cache lookup, thus breaking hidden services
  1315. entirely. Fixes bug 18704; bugfix on 0.2.0.20-rc. Patch by "twim".
  1316. - Clients now require hidden services to include the TAP keys for
  1317. their intro points in the hidden service descriptor. This prevents
  1318. an inadvertent upgrade to ntor, which a malicious hidden service
  1319. could use to distinguish clients by consensus version. Fixes bug
  1320. 20012; bugfix on 0.2.4.8-alpha. Patch by teor.
  1321. o Major bugfixes (relay, resolver, logging):
  1322. - For relays that don't know their own address, avoid attempting a
  1323. local hostname resolve for each descriptor we download. This
  1324. will cut down on the number of "Success: chose address 'x.x.x.x'"
  1325. log lines, and also avoid confusing clock jumps if the resolver
  1326. is slow. Fixes bugs 20423 and 20610; bugfix on 0.2.8.1-alpha.
  1327. o Minor features (port flags):
  1328. - Add new flags to the *Port options to give finer control over which
  1329. requests are allowed. The flags are NoDNSRequest, NoOnionTraffic,
  1330. and the synthetic flag OnionTrafficOnly, which is equivalent to
  1331. NoDNSRequest, NoIPv4Traffic, and NoIPv6Traffic. Closes enhancement
  1332. 18693; patch by "teor".
  1333. o Minor features (build, hardening):
  1334. - Detect and work around a libclang_rt problem that would prevent
  1335. clang from finding __mulodi4() on some 32-bit platforms, and thus
  1336. keep -ftrapv from linking on those systems. Closes ticket 19079.
  1337. - When building on a system without runtime support for the runtime
  1338. hardening options, try to log a useful warning at configuration
  1339. time, rather than an incomprehensible warning at link time. If
  1340. expensive hardening was requested, this warning becomes an error.
  1341. Closes ticket 18895.
  1342. o Minor features (client, directory):
  1343. - Since authorities now omit all routers that lack the Running and
  1344. Valid flags, we assume that any relay listed in the consensus must
  1345. have those flags. Closes ticket 20001; implements part of
  1346. proposal 272.
  1347. o Minor features (code safety):
  1348. - In our integer-parsing functions, ensure that the maximum value we
  1349. allow is no smaller than the minimum value. Closes ticket 19063;
  1350. patch from "U+039b".
  1351. o Minor features (compilation, portability):
  1352. - Compile correctly on MacOS 10.12 (aka "Sierra"). Closes
  1353. ticket 20241.
  1354. o Minor features (config):
  1355. - Warn users when descriptor and port addresses are inconsistent.
  1356. Mitigates bug 13953; patch by teor.
  1357. o Minor features (controller):
  1358. - Allow controllers to configure basic client authorization on
  1359. hidden services when they create them with the ADD_ONION controller
  1360. command. Implements ticket 15588. Patch by "special".
  1361. - Fire a STATUS_SERVER controller event whenever the hibernation
  1362. status changes between "awake"/"soft"/"hard". Closes ticket 18685.
  1363. - Implement new GETINFO queries for all downloads that use
  1364. download_status_t to schedule retries. This allows controllers to
  1365. examine the schedule for pending downloads. Closes ticket 19323.
  1366. o Minor features (development tools, etags):
  1367. - Teach the "make tags" Makefile target how to correctly find
  1368. "MOCK_IMPL" function definitions. Patch from nherring; closes
  1369. ticket 16869.
  1370. o Minor features (directory authority):
  1371. - After voting, if the authorities decide that a relay is not
  1372. "Valid", they no longer include it in the consensus at all. Closes
  1373. ticket 20002; implements part of proposal 272.
  1374. - Directory authorities now only give the Guard flag to a relay if
  1375. they are also giving it the Stable flag. This change allows us to
  1376. simplify path selection for clients. It should have minimal effect
  1377. in practice, since >99% of Guards already have the Stable flag.
  1378. Implements ticket 18624.
  1379. - Directory authorities now write their v3-status-votes file out to
  1380. disk earlier in the consensus process, so we have a record of the
  1381. votes even if we abort the consensus process. Resolves
  1382. ticket 19036.
  1383. o Minor features (fallback directory list, new since 0.2.9.7-rc):
  1384. - Replace the 81 remaining fallbacks of the 100 originally
  1385. introduced in Tor 0.2.8.3-alpha in March 2016, with a list of 177
  1386. fallbacks (123 new, 54 existing, 27 removed) generated in December
  1387. 2016. Resolves ticket 20170.
  1388. o Minor features (hidden service):
  1389. - Stop being so strict about the payload length of "rendezvous1"
  1390. cells. We used to be locked in to the "TAP" handshake length, and
  1391. now we can handle better handshakes like "ntor". Resolves
  1392. ticket 18998.
  1393. o Minor features (infrastructure, time):
  1394. - Tor now includes an improved timer backend, so that we can
  1395. efficiently support tens or hundreds of thousands of concurrent
  1396. timers, as will be needed for some of our planned anti-traffic-
  1397. analysis work. This code is based on William Ahern's "timeout.c"
  1398. project, which implements a "tickless hierarchical timing wheel".
  1399. Closes ticket 18365.
  1400. - Tor now uses the operating system's monotonic timers (where
  1401. available) for internal fine-grained timing. Previously we would
  1402. look at the system clock, and then attempt to compensate for the
  1403. clock running backwards. Closes ticket 18908.
  1404. o Minor features (logging):
  1405. - Add a set of macros to check nonfatal assertions, for internal
  1406. use. Migrating more of our checks to these should help us avoid
  1407. needless crash bugs. Closes ticket 18613.
  1408. - Provide a more useful warning message when configured with an
  1409. invalid Nickname. Closes ticket 18300; patch from "icanhasaccount".
  1410. - When dumping unparseable router descriptors, optionally store them
  1411. in separate files, named by digest, up to a configurable size
  1412. limit. You can change the size limit by setting the
  1413. MaxUnparseableDescSizeToLog option, and disable this feature by
  1414. setting that option to 0. Closes ticket 18322.
  1415. o Minor features (performance):
  1416. - Change the "optimistic data" extension from "off by default" to
  1417. "on by default". The default was ordinarily overridden by a
  1418. consensus option, but when clients were bootstrapping for the
  1419. first time, they would not have a consensus to get the option
  1420. from. Changing this default saves a round-trip during startup.
  1421. Closes ticket 18815.
  1422. o Minor features (relay, usability):
  1423. - When the directory authorities refuse a bad relay's descriptor,
  1424. encourage the relay operator to contact us. Many relay operators
  1425. won't notice this line in their logs, but it's a win if even a few
  1426. learn why we don't like what their relay was doing. Resolves
  1427. ticket 18760.
  1428. o Minor features (security, TLS):
  1429. - Servers no longer support clients that lack AES ciphersuites.
  1430. (3DES is no longer considered an acceptable cipher.) We believe
  1431. that no such Tor clients currently exist, since Tor has required
  1432. OpenSSL 0.9.7 or later since 2009. Closes ticket 19998.
  1433. o Minor features (testing):
  1434. - Disable memory protections on OpenBSD when performing our unit
  1435. tests for memwipe(). The test deliberately invokes undefined
  1436. behavior, and the OpenBSD protections interfere with this. Patch
  1437. from "rubiate". Closes ticket 20066.
  1438. - Move the test-network.sh script to chutney, and modify tor's test-
  1439. network.sh to call the (newer) chutney version when available.
  1440. Resolves ticket 19116. Patch by teor.
  1441. - Use the lcov convention for marking lines as unreachable, so that
  1442. we don't count them when we're generating test coverage data.
  1443. Update our coverage tools to understand this convention. Closes
  1444. ticket 16792.
  1445. - Our link-handshake unit tests now check that when invalid
  1446. handshakes fail, they fail with the error messages we expected.
  1447. - Our unit testing code that captures log messages no longer
  1448. prevents them from being written out if the user asked for them
  1449. (by passing --debug or --info or --notice or --warn to the "test"
  1450. binary). This change prevents us from missing unexpected log
  1451. messages simply because we were looking for others. Related to
  1452. ticket 19999.
  1453. - The unit tests now log all warning messages with the "BUG" flag.
  1454. Previously, they only logged errors by default. This change will
  1455. help us make our testing code more correct, and make sure that we
  1456. only hit this code when we mean to. In the meantime, however,
  1457. there will be more warnings in the unit test logs than before.
  1458. This is preparatory work for ticket 19999.
  1459. - The unit tests now treat any failure of a "tor_assert_nonfatal()"
  1460. assertion as a test failure.
  1461. - We've done significant work to make the unit tests run faster.
  1462. o Minor features (testing, ipv6):
  1463. - Add the hs-ipv6 chutney target to make test-network-all's IPv6
  1464. tests. Remove bridges+hs, as it's somewhat redundant. This
  1465. requires a recent chutney version that supports IPv6 clients,
  1466. relays, and authorities. Closes ticket 20069; patch by teor.
  1467. - Add the single-onion and single-onion-ipv6 chutney targets to
  1468. "make test-network-all". This requires a recent chutney version
  1469. with the single onion network flavors (git c72a652 or later).
  1470. Closes ticket 20072; patch by teor.
  1471. o Minor features (Tor2web):
  1472. - Make Tor2web clients respect ReachableAddresses. This feature was
  1473. inadvertently enabled in 0.2.8.6, then removed by bugfix 19973 on
  1474. 0.2.8.7. Implements feature 20034. Patch by teor.
  1475. o Minor features (unix domain sockets):
  1476. - When configuring a unix domain socket for a SocksPort,
  1477. ControlPort, or Hidden service, you can now wrap the address in
  1478. quotes, using C-style escapes inside the quotes. This allows unix
  1479. domain socket paths to contain spaces. Resolves ticket 18753.
  1480. o Minor features (user interface):
  1481. - Tor now supports the ability to declare options deprecated, so
  1482. that we can recommend that people stop using them. Previously, this
  1483. was done in an ad-hoc way. There is a new --list-deprecated-options
  1484. command-line option to list all of the deprecated options. Closes
  1485. ticket 19820.
  1486. o Minor features (virtual addresses):
  1487. - Increase the maximum number of bits for the IPv6 virtual network
  1488. prefix from 16 to 104. In this way, the condition for address
  1489. allocation is less restrictive. Closes ticket 20151; feature
  1490. on 0.2.4.7-alpha.
  1491. o Minor bug fixes (circuits):
  1492. - Use the CircuitBuildTimeout option whenever
  1493. LearnCircuitBuildTimeout is disabled. Previously, we would respect
  1494. the option when a user disabled it, but not when it was disabled
  1495. because some other option was set. Fixes bug 20073; bugfix on
  1496. 0.2.4.12-alpha. Patch by teor.
  1497. o Minor bugfixes (build):
  1498. - The current Git revision when building from a local repository is
  1499. now detected correctly when using git worktrees. Fixes bug 20492;
  1500. bugfix on 0.2.3.9-alpha.
  1501. o Minor bugfixes (relay address discovery):
  1502. - Stop reordering IP addresses returned by the OS. This makes it
  1503. more likely that Tor will guess the same relay IP address every
  1504. time. Fixes issue 20163; bugfix on 0.2.7.1-alpha, ticket 17027.
  1505. Reported by René Mayrhofer, patch by "cypherpunks".
  1506. o Minor bugfixes (memory allocation):
  1507. - Change how we allocate memory for large chunks on buffers, to
  1508. avoid a (currently impossible) integer overflow, and to waste less
  1509. space when allocating unusually large chunks. Fixes bug 20081;
  1510. bugfix on 0.2.0.16-alpha. Issue identified by Guido Vranken.
  1511. o Minor bugfixes (bootstrap):
  1512. - Remember the directory server we fetched the consensus or previous
  1513. certificates from, and use it to fetch future authority
  1514. certificates. This change improves bootstrapping performance.
  1515. Fixes bug 18963; bugfix on 0.2.8.1-alpha.
  1516. o Minor bugfixes (circuits):
  1517. - Make sure extend_info_from_router() is only called on servers.
  1518. Fixes bug 19639; bugfix on 0.2.8.1-alpha.
  1519. o Minor bugfixes (client, fascistfirewall):
  1520. - Avoid spurious warnings when ReachableAddresses or FascistFirewall
  1521. is set. Fixes bug 20306; bugfix on 0.2.8.2-alpha.
  1522. o Minor bugfixes (client, unix domain sockets):
  1523. - Disable IsolateClientAddr when using AF_UNIX backed SocksPorts as
  1524. the client address is meaningless. Fixes bug 20261; bugfix
  1525. on 0.2.6.3-alpha.
  1526. o Minor bugfixes (code style):
  1527. - Fix an integer signedness conversion issue in the case conversion
  1528. tables. Fixes bug 19168; bugfix on 0.2.1.11-alpha.
  1529. o Minor bugfixes (compilation):
  1530. - Build correctly on versions of libevent2 without support for
  1531. evutil_secure_rng_add_bytes(). Fixes bug 19904; bugfix
  1532. on 0.2.5.4-alpha.
  1533. - When building with Clang, use a full set of GCC warnings.
  1534. (Previously, we included only a subset, because of the way we
  1535. detected them.) Fixes bug 19216; bugfix on 0.2.0.1-alpha.
  1536. - Detect Libevent2 functions correctly on systems that provide
  1537. libevent2, but where libevent1 is linked with -levent. Fixes bug
  1538. 19904; bugfix on 0.2.2.24-alpha. Patch from Rubiate.
  1539. - Run correctly when built on Windows build environments that
  1540. require _vcsprintf(). Fixes bug 20560; bugfix on 0.2.2.11-alpha.
  1541. o Minor bugfixes (configuration):
  1542. - When parsing quoted configuration values from the torrc file,
  1543. handle Windows line endings correctly. Fixes bug 19167; bugfix on
  1544. 0.2.0.16-alpha. Patch from "Pingl".
  1545. o Minor bugfixes (directory authority):
  1546. - Authorities now sort the "package" lines in their votes, for ease
  1547. of debugging. (They are already sorted in consensus documents.)
  1548. Fixes bug 18840; bugfix on 0.2.6.3-alpha.
  1549. - Die with a more useful error when the operator forgets to place
  1550. the authority_signing_key file into the keys directory. This
  1551. avoids an uninformative assert & traceback about having an invalid
  1552. key. Fixes bug 20065; bugfix on 0.2.0.1-alpha.
  1553. - When allowing private addresses, mark Exits that only exit to
  1554. private locations as such. Fixes bug 20064; bugfix
  1555. on 0.2.2.9-alpha.
  1556. - When parsing a detached signature, make sure we use the length of
  1557. the digest algorithm instead of a hardcoded DIGEST256_LEN in
  1558. order to avoid comparing bytes out-of-bounds with a smaller digest
  1559. length such as SHA1. Fixes bug 19066; bugfix on 0.2.2.6-alpha.
  1560. o Minor bugfixes (getpass):
  1561. - Defensively fix a non-triggerable heap corruption at do_getpass()
  1562. to protect ourselves from mistakes in the future. Fixes bug
  1563. 19223; bugfix on 0.2.7.3-rc. Bug found by Guido Vranken, patch
  1564. by nherring.
  1565. o Minor bugfixes (guard selection):
  1566. - Don't mark guards as unreachable if connection_connect() fails.
  1567. That function fails for local reasons, so it shouldn't reveal
  1568. anything about the status of the guard. Fixes bug 14334; bugfix
  1569. on 0.2.3.10-alpha.
  1570. - Use a single entry guard even if the NumEntryGuards consensus
  1571. parameter is not provided. Fixes bug 17688; bugfix
  1572. on 0.2.5.6-alpha.
  1573. o Minor bugfixes (hidden services):
  1574. - Increase the minimum number of internal circuits we preemptively
  1575. build from 2 to 3, so a circuit is available when a client
  1576. connects to another onion service. Fixes bug 13239; bugfix
  1577. on 0.1.0.1-rc.
  1578. - Allow hidden services to run on IPv6 addresses even when the
  1579. IPv6Exit option is not set. Fixes bug 18357; bugfix
  1580. on 0.2.4.7-alpha.
  1581. - Stop logging intro point details to the client log on certain
  1582. error conditions. Fixed as part of bug 20012; bugfix on
  1583. 0.2.4.8-alpha. Patch by teor.
  1584. - When deleting an ephemeral hidden service, close its intro points
  1585. even if they are not completely open. Fixes bug 18604; bugfix
  1586. on 0.2.7.1-alpha.
  1587. - When configuring hidden services, check every hidden service
  1588. directory's permissions. Previously, we only checked the last
  1589. hidden service. Fixes bug 20529; bugfix on 0.2.6.2-alpha.
  1590. o Minor bugfixes (IPv6, testing):
  1591. - Check for IPv6 correctly on Linux when running test networks.
  1592. Fixes bug 19905; bugfix on 0.2.7.3-rc; patch by teor.
  1593. o Minor bugfixes (Linux seccomp2 sandbox):
  1594. - Add permission to run the sched_yield() and sigaltstack() system
  1595. calls, in order to support versions of Tor compiled with asan or
  1596. ubsan code that use these calls. Now "sandbox 1" and
  1597. "--enable-expensive-hardening" should be compatible on more
  1598. systems. Fixes bug 20063; bugfix on 0.2.5.1-alpha.
  1599. o Minor bugfixes (logging):
  1600. - Downgrade a harmless log message about the
  1601. pending_entry_connections list from "warn" to "info". Mitigates
  1602. bug 19926.
  1603. - Log a more accurate message when we fail to dump a microdescriptor.
  1604. Fixes bug 17758; bugfix on 0.2.2.8-alpha. Patch from Daniel Pinto.
  1605. - When logging a directory ownership mismatch, log the owning
  1606. username correctly. Fixes bug 19578; bugfix on 0.2.2.29-beta.
  1607. - When we are unable to remove the bw_accounting file, do not warn
  1608. if the reason we couldn't remove it was that it didn't exist.
  1609. Fixes bug 19964; bugfix on 0.2.5.4-alpha. Patch from pastly.
  1610. o Minor bugfixes (memory leak):
  1611. - Fix a series of slow memory leaks related to parsing torrc files
  1612. and options. Fixes bug 19466; bugfix on 0.2.1.6-alpha.
  1613. - Avoid a small memory leak when informing worker threads about
  1614. rotated onion keys. Fixes bug 20401; bugfix on 0.2.6.3-alpha.
  1615. - Fix a small memory leak when receiving AF_UNIX connections on a
  1616. SocksPort. Fixes bug 20716; bugfix on 0.2.6.3-alpha.
  1617. - When moving a signed descriptor object from a source to an
  1618. existing destination, free the allocated memory inside that
  1619. destination object. Fixes bug 20715; bugfix on 0.2.8.3-alpha.
  1620. - Fix a memory leak and use-after-free error when removing entries
  1621. from the sandbox's getaddrinfo() cache. Fixes bug 20710; bugfix on
  1622. 0.2.5.5-alpha. Patch from "cypherpunks".
  1623. - Fix a small, uncommon memory leak that could occur when reading a
  1624. truncated ed25519 key file. Fixes bug 18956; bugfix
  1625. on 0.2.6.1-alpha.
  1626. o Minor bugfixes (option parsing):
  1627. - Count unix sockets when counting client listeners (SOCKS, Trans,
  1628. NATD, and DNS). This has no user-visible behavior changes: these
  1629. options are set once, and never read. Required for correct
  1630. behavior in ticket 17178. Fixes bug 19677; bugfix on
  1631. 0.2.6.3-alpha. Patch by teor.
  1632. o Minor bugfixes (options):
  1633. - Check the consistency of UseEntryGuards and EntryNodes more
  1634. reliably. Fixes bug 20074; bugfix on 0.2.4.12-alpha. Patch
  1635. by teor.
  1636. - Stop changing the configured value of UseEntryGuards on
  1637. authorities and Tor2web clients. Fixes bug 20074; bugfix on
  1638. commits 51fc6799 in 0.1.1.16-rc and acda1735 in 0.2.4.3-alpha.
  1639. Patch by teor.
  1640. o Minor bugfixes (relay):
  1641. - Ensure relays don't make multiple connections during bootstrap.
  1642. Fixes bug 20591; bugfix on 0.2.8.1-alpha.
  1643. - Do not try to parallelize workers more than 16x without the user
  1644. explicitly configuring us to do so, even if we do detect more than
  1645. 16 CPU cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
  1646. o Minor bugfixes (testing):
  1647. - The test-stem and test-network makefile targets now depend only on
  1648. the tor binary that they are testing. Previously, they depended on
  1649. "make all". Fixes bug 18240; bugfix on 0.2.8.2-alpha. Based on a
  1650. patch from "cypherpunks".
  1651. - Allow clients to retry HSDirs much faster in test networks. Fixes
  1652. bug 19702; bugfix on 0.2.7.1-alpha. Patch by teor.
  1653. - Avoid a unit test failure on systems with over 16 detectable CPU
  1654. cores. Fixes bug 19968; bugfix on 0.2.3.1-alpha.
  1655. - Let backtrace tests work correctly under AddressSanitizer:
  1656. disable ASAN's detection of segmentation faults while running
  1657. test_bt.sh, so that we can make sure that our own backtrace
  1658. generation code works. Fixes bug 18934; bugfix
  1659. on 0.2.5.2-alpha. Patch from "cypherpunks".
  1660. - Fix the test-network-all target on out-of-tree builds by using the
  1661. correct path to the test driver script. Fixes bug 19421; bugfix
  1662. on 0.2.7.3-rc.
  1663. - Stop spurious failures in the local interface address discovery
  1664. unit tests. Fixes bug 20634; bugfix on 0.2.8.1-alpha; patch by
  1665. Neel Chauhan.
  1666. - Use ECDHE ciphers instead of ECDH in tortls tests. LibreSSL has
  1667. removed the ECDH ciphers which caused the tests to fail on
  1668. platforms which use it. Fixes bug 20460; bugfix on 0.2.8.1-alpha.
  1669. - The tor_tls_server_info_callback unit test no longer crashes when
  1670. debug-level logging is turned on. Fixes bug 20041; bugfix
  1671. on 0.2.8.1-alpha.
  1672. o Minor bugfixes (time):
  1673. - Improve overflow checks in tv_udiff and tv_mdiff. Fixes bug 19483;
  1674. bugfix on all released tor versions.
  1675. - When computing the difference between two times in milliseconds,
  1676. we now round to the nearest millisecond correctly. Previously, we
  1677. could sometimes round in the wrong direction. Fixes bug 19428;
  1678. bugfix on 0.2.2.2-alpha.
  1679. o Minor bugfixes (Tor2web):
  1680. - Prevent Tor2web clients from running hidden services: these services
  1681. are not anonymous due to the one-hop client paths. Fixes bug
  1682. 19678. Patch by teor.
  1683. o Minor bugfixes (user interface):
  1684. - Display a more accurate number of suppressed messages in the log
  1685. rate-limiter. Previously, there was a potential integer overflow
  1686. in the counter. Now, if the number of messages hits a maximum, the
  1687. rate-limiter doesn't count any further. Fixes bug 19435; bugfix
  1688. on 0.2.4.11-alpha.
  1689. - Fix a typo in the passphrase prompt for the ed25519 identity key.
  1690. Fixes bug 19503; bugfix on 0.2.7.2-alpha.
  1691. o Code simplification and refactoring:
  1692. - Remove redundant declarations of the MIN macro. Closes
  1693. ticket 18889.
  1694. - Rename tor_dup_addr() to tor_addr_to_str_dup() to avoid confusion.
  1695. Closes ticket 18462; patch from "icanhasaccount".
  1696. - Split the 600-line directory_handle_command_get function into
  1697. separate functions for different URL types. Closes ticket 16698.
  1698. o Documentation:
  1699. - Add module-level internal documentation for 36 C files that
  1700. previously didn't have a high-level overview. Closes ticket 20385.
  1701. - Correct the IPv6 syntax in our documentation for the
  1702. VirtualAddrNetworkIPv6 torrc option. Closes ticket 19743.
  1703. - Correct the minimum bandwidth value in torrc.sample, and queue a
  1704. corresponding change for torrc.minimal. Closes ticket 20085.
  1705. - Fix spelling of "--enable-tor2web-mode" in the manpage. Closes
  1706. ticket 19153. Patch from "U+039b".
  1707. - Module-level documentation for several more modules. Closes
  1708. tickets 19287 and 19290.
  1709. - Document the --passphrase-fd option in the tor manpage. Fixes bug
  1710. 19504; bugfix on 0.2.7.3-rc.
  1711. - Document the default PathsNeededToBuildCircuits value that's used
  1712. by clients when the directory authorities don't set
  1713. min_paths_for_circs_pct. Fixes bug 20117; bugfix on 0.2.4.10-alpha.
  1714. Patch by teor, reported by Jesse V.
  1715. - Fix manual for the User option: it takes a username, not a UID.
  1716. Fixes bug 19122; bugfix on 0.0.2pre16 (the first version to have
  1717. a manpage!).
  1718. - Fix the description of the --passphrase-fd option in the
  1719. tor-gencert manpage. The option is used to pass the number of a
  1720. file descriptor to read the passphrase from, not to read the file
  1721. descriptor from. Fixes bug 19505; bugfix on 0.2.0.20-alpha.
  1722. o Removed code:
  1723. - We no longer include the (dead, deprecated) bufferevent code in
  1724. Tor. Closes ticket 19450. Based on a patch from "U+039b".
  1725. o Removed features:
  1726. - Remove support for "GET /tor/bytes.txt" DirPort request, and
  1727. "GETINFO dir-usage" controller request, which were only available
  1728. via a compile-time option in Tor anyway. Feature was added in
  1729. 0.2.2.1-alpha. Resolves ticket 19035.
  1730. - There is no longer a compile-time option to disable support for
  1731. TransPort. (If you don't want TransPort, just don't use it.) Patch
  1732. from "U+039b". Closes ticket 19449.
  1733. o Testing:
  1734. - Run more workqueue tests as part of "make check". These had
  1735. previously been implemented, but you needed to know special
  1736. command-line options to enable them.
  1737. - We now have unit tests for our code to reject zlib "compression
  1738. bombs". (Fortunately, the code works fine.)
  1739. Changes in version 0.2.8.11 - 2016-12-08
  1740. Tor 0.2.8.11 backports fixes for additional portability issues that
  1741. could prevent Tor from building correctly on OSX Sierra, or with
  1742. OpenSSL 1.1. Affected users should upgrade; others can safely stay
  1743. with 0.2.8.10.
  1744. o Minor bugfixes (portability):
  1745. - Avoid compilation errors when building on OSX Sierra. Sierra began
  1746. to support the getentropy() and clock_gettime() APIs, but created
  1747. a few problems in doing so. Tor 0.2.9 has a more thorough set of
  1748. workarounds; in 0.2.8, we are just using the /dev/urandom and mach
  1749. monotonic time interfaces. Fixes bug 20865. Bugfix
  1750. on 0.2.8.1-alpha.
  1751. o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
  1752. - Fix compilation with OpenSSL 1.1 and less commonly-used CPU
  1753. architectures. Closes ticket 20588.
  1754. Changes in version 0.2.8.10 - 2016-12-02
  1755. Tor 0.2.8.10 backports a fix for a bug that would sometimes make clients
  1756. unusable after they left standby mode. It also backports fixes for
  1757. a few portability issues and a small but problematic memory leak.
  1758. o Major bugfixes (client reliability, backport from 0.2.9.5-alpha):
  1759. - When Tor leaves standby because of a new application request, open
  1760. circuits as needed to serve that request. Previously, we would
  1761. potentially wait a very long time. Fixes part of bug 19969; bugfix
  1762. on 0.2.8.1-alpha.
  1763. o Major bugfixes (client performance, backport from 0.2.9.5-alpha):
  1764. - Clients now respond to new application stream requests immediately
  1765. when they arrive, rather than waiting up to one second before
  1766. starting to handle them. Fixes part of bug 19969; bugfix
  1767. on 0.2.8.1-alpha.
  1768. o Minor bugfixes (portability, backport from 0.2.9.6-rc):
  1769. - Work around a bug in the OSX 10.12 SDK that would prevent us from
  1770. successfully targeting earlier versions of OSX. Resolves
  1771. ticket 20235.
  1772. o Minor bugfixes (portability, backport from 0.2.9.5-alpha):
  1773. - Fix implicit conversion warnings under OpenSSL 1.1. Fixes bug
  1774. 20551; bugfix on 0.2.1.1-alpha.
  1775. o Minor bugfixes (relay, backport from 0.2.9.5-alpha):
  1776. - Work around a memory leak in OpenSSL 1.1 when encoding public
  1777. keys. Fixes bug 20553; bugfix on 0.0.2pre8.
  1778. o Minor features (geoip):
  1779. - Update geoip and geoip6 to the November 3 2016 Maxmind GeoLite2
  1780. Country database.
  1781. Changes in version 0.2.8.9 - 2016-10-17
  1782. Tor 0.2.8.9 backports a fix for a security hole in previous versions
  1783. of Tor that would allow a remote attacker to crash a Tor client,
  1784. hidden service, relay, or authority. All Tor users should upgrade to
  1785. this version, or to 0.2.9.4-alpha. Patches will be released for older
  1786. versions of Tor.
  1787. o Major features (security fixes, also in 0.2.9.4-alpha):
  1788. - Prevent a class of security bugs caused by treating the contents
  1789. of a buffer chunk as if they were a NUL-terminated string. At
  1790. least one such bug seems to be present in all currently used
  1791. versions of Tor, and would allow an attacker to remotely crash
  1792. most Tor instances, especially those compiled with extra compiler
  1793. hardening. With this defense in place, such bugs can't crash Tor,
  1794. though we should still fix them as they occur. Closes ticket
  1795. 20384 (TROVE-2016-10-001).
  1796. o Minor features (geoip):
  1797. - Update geoip and geoip6 to the October 4 2016 Maxmind GeoLite2
  1798. Country database.
  1799. Changes in version 0.2.8.8 - 2016-09-23
  1800. Tor 0.2.8.8 fixes two crash bugs present in previous versions of the
  1801. 0.2.8.x series. Relays running 0.2.8.x should upgrade, as should users
  1802. who select public relays as their bridges.
  1803. o Major bugfixes (crash):
  1804. - Fix a complicated crash bug that could affect Tor clients
  1805. configured to use bridges when replacing a networkstatus consensus
  1806. in which one of their bridges was mentioned. OpenBSD users saw
  1807. more crashes here, but all platforms were potentially affected.
  1808. Fixes bug 20103; bugfix on 0.2.8.2-alpha.
  1809. o Major bugfixes (relay, OOM handler):
  1810. - Fix a timing-dependent assertion failure that could occur when we
  1811. tried to flush from a circuit after having freed its cells because
  1812. of an out-of-memory condition. Fixes bug 20203; bugfix on
  1813. 0.2.8.1-alpha. Thanks to "cypherpunks" for help diagnosing
  1814. this one.
  1815. o Minor feature (fallback directories):
  1816. - Remove broken fallbacks from the hard-coded fallback directory
  1817. list. Closes ticket 20190; patch by teor.
  1818. o Minor features (geoip):
  1819. - Update geoip and geoip6 to the September 6 2016 Maxmind GeoLite2
  1820. Country database.
  1821. Changes in version 0.2.8.7 - 2016-08-24
  1822. Tor 0.2.8.7 fixes an important bug related to the ReachableAddresses
  1823. option in 0.2.8.6, and replaces a retiring bridge authority. Everyone
  1824. who sets the ReachableAddresses option, and all bridges, are strongly
  1825. encouraged to upgrade.
  1826. o Directory authority changes:
  1827. - The "Tonga" bridge authority has been retired; the new bridge
  1828. authority is "Bifroest". Closes tickets 19728 and 19690.
  1829. o Major bugfixes (client, security):
  1830. - Only use the ReachableAddresses option to restrict the first hop
  1831. in a path. In earlier versions of 0.2.8.x, it would apply to
  1832. every hop in the path, with a possible degradation in anonymity
  1833. for anyone using an uncommon ReachableAddress setting. Fixes bug
  1834. 19973; bugfix on 0.2.8.2-alpha.
  1835. o Minor features (geoip):
  1836. - Update geoip and geoip6 to the August 2 2016 Maxmind GeoLite2
  1837. Country database.
  1838. o Minor bugfixes (compilation):
  1839. - Remove an inappropriate "inline" in tortls.c that was causing
  1840. warnings on older versions of GCC. Fixes bug 19903; bugfix
  1841. on 0.2.8.1-alpha.
  1842. o Minor bugfixes (fallback directories):
  1843. - Avoid logging a NULL string pointer when loading fallback
  1844. directory information. Fixes bug 19947; bugfix on 0.2.4.7-alpha
  1845. and 0.2.8.1-alpha. Report and patch by "rubiate".
  1846. Changes in version 0.2.8.6 - 2016-08-02
  1847. Tor 0.2.8.6 is the first stable version of the Tor 0.2.8 series.
  1848. The Tor 0.2.8 series improves client bootstrapping performance,
  1849. completes the authority-side implementation of improved identity
  1850. keys for relays, and includes numerous bugfixes and performance
  1851. improvements throughout the program. This release continues to
  1852. improve the coverage of Tor's test suite. For a full list of
  1853. changes since Tor 0.2.7, see the ReleaseNotes file.
  1854. Below is a list of the changes since Tor 0.2.7.
  1855. o New system requirements:
  1856. - Tor no longer attempts to support platforms where the "time_t"
  1857. type is unsigned. (To the best of our knowledge, only OpenVMS does
  1858. this, and Tor has never actually built on OpenVMS.) Closes
  1859. ticket 18184.
  1860. - Tor no longer supports versions of OpenSSL with a broken
  1861. implementation of counter mode. (This bug was present in OpenSSL
  1862. 1.0.0, and was fixed in OpenSSL 1.0.0a.) Tor still detects, but no
  1863. longer runs with, these versions.
  1864. - Tor now uses Autoconf version 2.63 or later, and Automake 1.11 or
  1865. later (released in 2008 and 2009 respectively). If you are
  1866. building Tor from the git repository instead of from the source
  1867. distribution, and your tools are older than this, you will need to
  1868. upgrade. Closes ticket 17732.
  1869. o Directory authority changes:
  1870. - Update the V3 identity key for the dannenberg directory authority:
  1871. it was changed on 18 November 2015. Closes task 17906. Patch
  1872. by teor.
  1873. - Urras is no longer a directory authority. Closes ticket 19271.
  1874. o Major features (directory system):
  1875. - Include a trial list of default fallback directories, based on an
  1876. opt-in survey of suitable relays. Doing this should make clients
  1877. bootstrap more quickly and reliably, and reduce the load on the
  1878. directory authorities. Closes ticket 15775. Patch by teor.
  1879. Candidates identified using an OnionOO script by weasel, teor,
  1880. gsathya, and karsten.
  1881. - Previously only relays that explicitly opened a directory port
  1882. (DirPort) accepted directory requests from clients. Now all
  1883. relays, with and without a DirPort, accept and serve tunneled
  1884. directory requests that they receive through their ORPort. You can
  1885. disable this behavior using the new DirCache option. Closes
  1886. ticket 12538.
  1887. - When bootstrapping multiple consensus downloads at a time, use the
  1888. first one that starts downloading, and close the rest. This
  1889. reduces failures when authorities or fallback directories are slow
  1890. or down. Together with the code for feature 15775, this feature
  1891. should reduces failures due to fallback churn. Implements ticket
  1892. 4483. Patch by teor. Implements IPv4 portions of proposal 210 by
  1893. mikeperry and teor.
  1894. o Major features (security, Linux):
  1895. - When Tor starts as root on Linux and is told to switch user ID, it
  1896. can now retain the capability to bind to low ports. By default,
  1897. Tor will do this only when it's switching user ID and some low
  1898. ports have been configured. You can change this behavior with the
  1899. new option KeepBindCapabilities. Closes ticket 8195.
  1900. o Major bugfixes (client, bootstrapping):
  1901. - Check if bootstrap consensus downloads are still needed when the
  1902. linked connection attaches. This prevents tor making unnecessary
  1903. begindir-style connections, which are the only directory
  1904. connections tor clients make since the fix for 18483 was merged.
  1905. - Fix some edge cases where consensus download connections may not
  1906. have been closed, even though they were not needed. Related to fix
  1907. for 18809.
  1908. - Make relays retry consensus downloads the correct number of times,
  1909. rather than the more aggressive client retry count. Fixes part of
  1910. ticket 18809.
  1911. o Major bugfixes (dns proxy mode, crash):
  1912. - Avoid crashing when running as a DNS proxy. Fixes bug 16248;
  1913. bugfix on 0.2.0.1-alpha. Patch from "cypherpunks".
  1914. o Major bugfixes (ed25519, voting):
  1915. - Actually enable support for authorities to match routers by their
  1916. Ed25519 identities. Previously, the code had been written, but
  1917. some debugging code that had accidentally been left in the
  1918. codebase made it stay turned off. Fixes bug 17702; bugfix
  1919. on 0.2.7.2-alpha.
  1920. - When collating votes by Ed25519 identities, authorities now
  1921. include a "NoEdConsensus" flag if the ed25519 value (or lack
  1922. thereof) for a server does not reflect the majority consensus.
  1923. Related to bug 17668; bugfix on 0.2.7.2-alpha.
  1924. - When generating a vote with keypinning disabled, never include two
  1925. entries for the same ed25519 identity. This bug was causing
  1926. authorities to generate votes that they could not parse when a
  1927. router violated key pinning by changing its RSA identity but
  1928. keeping its Ed25519 identity. Fixes bug 17668; fixes part of bug
  1929. 18318. Bugfix on 0.2.7.2-alpha.
  1930. o Major bugfixes (key management):
  1931. - If OpenSSL fails to generate an RSA key, do not retain a dangling
  1932. pointer to the previous (uninitialized) key value. The impact here
  1933. should be limited to a difficult-to-trigger crash, if OpenSSL is
  1934. running an engine that makes key generation failures possible, or
  1935. if OpenSSL runs out of memory. Fixes bug 19152; bugfix on
  1936. 0.2.1.10-alpha. Found by Yuan Jochen Kang, Suman Jana, and
  1937. Baishakhi Ray.
  1938. o Major bugfixes (security, client, DNS proxy):
  1939. - Stop a crash that could occur when a client running with DNSPort
  1940. received a query with multiple address types, and the first
  1941. address type was not supported. Found and fixed by Scott Dial.
  1942. Fixes bug 18710; bugfix on 0.2.5.4-alpha.
  1943. o Major bugfixes (security, compilation):
  1944. - Correctly detect compiler flags on systems where _FORTIFY_SOURCE
  1945. is predefined. Previously, our use of -D_FORTIFY_SOURCE would
  1946. cause a compiler warning, thereby making other checks fail, and
  1947. needlessly disabling compiler-hardening support. Fixes one case of
  1948. bug 18841; bugfix on 0.2.3.17-beta. Patch from "trudokal".
  1949. - Repair hardened builds under the clang compiler. Previously, our
  1950. use of _FORTIFY_SOURCE would conflict with clang's address
  1951. sanitizer. Fixes bug 14821; bugfix on 0.2.5.4-alpha.
  1952. o Major bugfixes (security, pointers):
  1953. - Avoid a difficult-to-trigger heap corruption attack when extending
  1954. a smartlist to contain over 16GB of pointers. Fixes bug 18162;
  1955. bugfix on 0.1.1.11-alpha, which fixed a related bug incompletely.
  1956. Reported by Guido Vranken.
  1957. o Major bugfixes (testing):
  1958. - Fix a bug that would block 'make test-network-all' on systems where
  1959. IPv6 packets were lost. Fixes bug 19008; bugfix on 0.2.7.3-rc.
  1960. o Major bugfixes (user interface):
  1961. - Correctly give a warning in the cases where a relay is specified
  1962. by nickname, and one such relay is found, but it is not officially
  1963. Named. Fixes bug 19203; bugfix on 0.2.3.1-alpha.
  1964. o Minor features (accounting):
  1965. - Added two modes to the AccountingRule option: One for limiting
  1966. only the number of bytes sent ("AccountingRule out"), and one for
  1967. limiting only the number of bytes received ("AccountingRule in").
  1968. Closes ticket 15989; patch from "unixninja92".
  1969. o Minor features (bug-resistance):
  1970. - Make Tor survive errors involving connections without a
  1971. corresponding event object. Previously we'd fail with an
  1972. assertion; now we produce a log message. Related to bug 16248.
  1973. - Use tor_snprintf() and tor_vsnprintf() even in external and low-
  1974. level code, to harden against accidental failures to NUL-
  1975. terminate. Part of ticket 17852. Patch from jsturgix. Found
  1976. with Flawfinder.
  1977. o Minor features (build):
  1978. - Detect systems with FreeBSD-derived kernels (such as GNU/kFreeBSD)
  1979. as having possible IPFW support. Closes ticket 18448. Patch from
  1980. Steven Chamberlain.
  1981. - Since our build process now uses "make distcheck", we no longer
  1982. force "make dist" to depend on "make check". Closes ticket 17893;
  1983. patch from "cypherpunks".
  1984. - Tor now builds once again with the recent OpenSSL 1.1 development
  1985. branch (tested against 1.1.0-pre5 and 1.1.0-pre6-dev). We have been
  1986. tracking OpenSSL 1.1 development as it has progressed, and fixing
  1987. numerous compatibility issues as they arose. See tickets
  1988. 17549, 17921, 17984, 19499, and 18286.
  1989. - When building manual pages, set the timezone to "UTC", so that the
  1990. output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
  1991. Patch from intrigeri.
  1992. o Minor features (clients):
  1993. - Make clients, onion services, and bridge relays always use an
  1994. encrypted begindir connection for directory requests. Resolves
  1995. ticket 18483. Patch by teor.
  1996. o Minor features (controller):
  1997. - Add 'GETINFO exit-policy/reject-private/[default,relay]', so
  1998. controllers can examine the the reject rules added by
  1999. ExitPolicyRejectPrivate. This makes it easier for stem to display
  2000. exit policies.
  2001. - Adds the FallbackDir entries to 'GETINFO config/defaults'. Closes
  2002. tickets 16774 and 17817. Patch by George Tankersley.
  2003. - New 'GETINFO hs/service/desc/id/' command to retrieve a hidden
  2004. service descriptor from a service's local hidden service
  2005. descriptor cache. Closes ticket 14846.
  2006. o Minor features (crypto):
  2007. - Add SHA3 and SHAKE support to crypto.c. Closes ticket 17783.
  2008. - Add SHA512 support to crypto.c. Closes ticket 17663; patch from
  2009. George Tankersley.
  2010. - Improve performance when hashing non-multiple of 8 sized buffers,
  2011. based on Andrew Moon's public domain SipHash-2-4 implementation.
  2012. Fixes bug 17544; bugfix on 0.2.5.3-alpha.
  2013. - Validate the hard-coded Diffie-Hellman parameters and ensure that
  2014. p is a safe prime, and g is a suitable generator. Closes
  2015. ticket 18221.
  2016. - When allocating a digest state object, allocate no more space than
  2017. we actually need. Previously, we would allocate as much space as
  2018. the state for the largest algorithm would need. This change saves
  2019. up to 672 bytes per circuit. Closes ticket 17796.
  2020. o Minor features (directory downloads):
  2021. - Add UseDefaultFallbackDirs, which enables any hard-coded fallback
  2022. directory mirrors. The default is 1; set it to 0 to disable
  2023. fallbacks. Implements ticket 17576. Patch by teor.
  2024. - Wait for busy authorities and fallback directories to become non-
  2025. busy when bootstrapping. (A similar change was made in 6c443e987d
  2026. for directory caches chosen from the consensus.) Closes ticket
  2027. 17864; patch by teor.
  2028. o Minor features (geoip):
  2029. - Update geoip and geoip6 to the July 6 2016 Maxmind GeoLite2
  2030. Country database.
  2031. o Minor features (hidden service directory):
  2032. - Streamline relay-side hsdir handling: when relays consider whether
  2033. to accept an uploaded hidden service descriptor, they no longer
  2034. check whether they are one of the relays in the network that is
  2035. "supposed" to handle that descriptor. Implements ticket 18332.
  2036. o Minor features (IPv6):
  2037. - Add ClientPreferIPv6DirPort, which is set to 0 by default. If set
  2038. to 1, tor prefers IPv6 directory addresses.
  2039. - Add ClientUseIPv4, which is set to 1 by default. If set to 0, tor
  2040. avoids using IPv4 for client OR and directory connections.
  2041. - Add address policy assume_action support for IPv6 addresses.
  2042. - Add an argument 'ipv6=address:orport' to the DirAuthority and
  2043. FallbackDir torrc options, to specify an IPv6 address for an
  2044. authority or fallback directory. Add hard-coded ipv6 addresses for
  2045. directory authorities that have them. Closes ticket 17327; patch
  2046. from Nick Mathewson and teor.
  2047. - Allow users to configure directory authorities and fallback
  2048. directory servers with IPv6 addresses and ORPorts. Resolves
  2049. ticket 6027.
  2050. - Limit IPv6 mask bits to 128.
  2051. - Make tor_ersatz_socketpair work on IPv6-only systems. Fixes bug
  2052. 17638; bugfix on 0.0.2pre8. Patch by teor.
  2053. - Try harder to obey the IP version restrictions "ClientUseIPv4 0",
  2054. "ClientUseIPv6 0", "ClientPreferIPv6ORPort", and
  2055. "ClientPreferIPv6DirPort". Closes ticket 17840; patch by teor.
  2056. - Warn when comparing against an AF_UNSPEC address in a policy, it's
  2057. almost always a bug. Closes ticket 17863; patch by teor.
  2058. - routerset_parse now accepts IPv6 literal addresses. Fixes bug
  2059. 17060; bugfix on 0.2.1.3-alpha. Patch by teor.
  2060. o Minor features (Linux seccomp2 sandbox):
  2061. - Reject attempts to change our Address with "Sandbox 1" enabled.
  2062. Changing Address with Sandbox turned on would never actually work,
  2063. but previously it would fail in strange and confusing ways. Found
  2064. while fixing 18548.
  2065. o Minor features (logging):
  2066. - When logging to syslog, allow a tag to be added to the syslog
  2067. identity (the string prepended to every log message). The tag can
  2068. be configured with SyslogIdentityTag and defaults to none. Setting
  2069. it to "foo" will cause logs to be tagged as "Tor-foo". Closes
  2070. ticket 17194.
  2071. o Minor features (portability):
  2072. - Use timingsafe_memcmp() where available. Closes ticket 17944;
  2073. patch from <logan@hackers.mu>.
  2074. o Minor features (relay, address discovery):
  2075. - Add a family argument to get_interface_addresses_raw() and
  2076. subfunctions to make network interface address interogation more
  2077. efficient. Now Tor can specifically ask for IPv4, IPv6 or both
  2078. types of interfaces from the operating system. Resolves
  2079. ticket 17950.
  2080. - When get_interface_address6_list(.,AF_UNSPEC,.) is called and
  2081. fails to enumerate interface addresses using the platform-specific
  2082. API, have it rely on the UDP socket fallback technique to try and
  2083. find out what IP addresses (both IPv4 and IPv6) our machine has.
  2084. Resolves ticket 17951.
  2085. o Minor features (replay cache):
  2086. - The replay cache now uses SHA256 instead of SHA1. Implements
  2087. feature 8961. Patch by teor, issue reported by rransom.
  2088. o Minor features (robustness):
  2089. - Exit immediately with an error message if the code attempts to use
  2090. Libevent without having initialized it. This should resolve some
  2091. frequently-made mistakes in our unit tests. Closes ticket 18241.
  2092. o Minor features (security, clock):
  2093. - Warn when the system clock appears to move back in time (when the
  2094. state file was last written in the future). Tor doesn't know that
  2095. consensuses have expired if the clock is in the past. Patch by
  2096. teor. Implements ticket 17188.
  2097. o Minor features (security, exit policies):
  2098. - ExitPolicyRejectPrivate now rejects more private addresses by
  2099. default. Specifically, it now rejects the relay's outbound bind
  2100. addresses (if configured), and the relay's configured port
  2101. addresses (such as ORPort and DirPort). Fixes bug 17027; bugfix on
  2102. 0.2.0.11-alpha. Patch by teor.
  2103. o Minor features (security, memory erasure):
  2104. - Make memwipe() do nothing when passed a NULL pointer or buffer of
  2105. zero size. Check size argument to memwipe() for underflow. Fixes
  2106. bug 18089; bugfix on 0.2.3.25 and 0.2.4.6-alpha. Reported by "gk",
  2107. patch by teor.
  2108. - Set the unused entries in a smartlist to NULL. This helped catch
  2109. a (harmless) bug, and shouldn't affect performance too much.
  2110. Implements ticket 17026.
  2111. - Use SecureMemoryWipe() function to securely clean memory on
  2112. Windows. Previously we'd use OpenSSL's OPENSSL_cleanse() function.
  2113. Implements feature 17986.
  2114. - Use explicit_bzero or memset_s when present. Previously, we'd use
  2115. OpenSSL's OPENSSL_cleanse() function. Closes ticket 7419; patches
  2116. from <logan@hackers.mu> and <selven@hackers.mu>.
  2117. o Minor features (security, RNG):
  2118. - Adjust Tor's use of OpenSSL's RNG APIs so that they absolutely,
  2119. positively are not allowed to fail. Previously we depended on
  2120. internal details of OpenSSL's behavior. Closes ticket 17686.
  2121. - Never use the system entropy output directly for anything besides
  2122. seeding the PRNG. When we want to generate important keys, instead
  2123. of using system entropy directly, we now hash it with the PRNG
  2124. stream. This may help resist certain attacks based on broken OS
  2125. entropy implementations. Closes part of ticket 17694.
  2126. - Use modern system calls (like getentropy() or getrandom()) to
  2127. generate strong entropy on platforms that have them. Closes
  2128. ticket 13696.
  2129. o Minor features (security, win32):
  2130. - Set SO_EXCLUSIVEADDRUSE on Win32 to avoid a local port-stealing
  2131. attack. Fixes bug 18123; bugfix on all tor versions. Patch
  2132. by teor.
  2133. o Minor features (unix domain sockets):
  2134. - Add a new per-socket option, RelaxDirModeCheck, to allow creating
  2135. Unix domain sockets without checking the permissions on the parent
  2136. directory. (Tor checks permissions by default because some
  2137. operating systems only check permissions on the parent directory.
  2138. However, some operating systems do look at permissions on the
  2139. socket, and tor's default check is unneeded.) Closes ticket 18458.
  2140. Patch by weasel.
  2141. o Minor features (unix file permissions):
  2142. - Defer creation of Unix sockets until after setuid. This avoids
  2143. needing CAP_CHOWN and CAP_FOWNER when using systemd's
  2144. CapabilityBoundingSet, or chown and fowner when using SELinux.
  2145. Implements part of ticket 17562. Patch from Jamie Nguyen.
  2146. - If any directory created by Tor is marked as group readable, the
  2147. filesystem group is allowed to be either the default GID or the
  2148. root user. Allowing root to read the DataDirectory prevents the
  2149. need for CAP_READ_SEARCH when using systemd's
  2150. CapabilityBoundingSet, or dac_read_search when using SELinux.
  2151. Implements part of ticket 17562. Patch from Jamie Nguyen.
  2152. - Introduce a new DataDirectoryGroupReadable option. If it is set to
  2153. 1, the DataDirectory will be made readable by the default GID.
  2154. Implements part of ticket 17562. Patch from Jamie Nguyen.
  2155. o Minor bugfixes (accounting):
  2156. - The max bandwidth when using 'AccountRule sum' is now correctly
  2157. logged. Fixes bug 18024; bugfix on 0.2.6.1-alpha. Patch
  2158. from "unixninja92".
  2159. o Minor bugfixes (assert, portability):
  2160. - Fix an assertion failure in memarea.c on systems where "long" is
  2161. shorter than the size of a pointer. Fixes bug 18716; bugfix
  2162. on 0.2.1.1-alpha.
  2163. o Minor bugfixes (bootstrap):
  2164. - Consistently use the consensus download schedule for authority
  2165. certificates. Fixes bug 18816; bugfix on 0.2.4.13-alpha.
  2166. o Minor bugfixes (build):
  2167. - Avoid spurious failures from configure files related to calling
  2168. exit(0) in TOR_SEARCH_LIBRARY. Fixes bug 18626; bugfix on
  2169. 0.2.0.1-alpha. Patch from "cypherpunks".
  2170. - Do not link the unit tests against both the testing and non-
  2171. testing versions of the static libraries. Fixes bug 18490; bugfix
  2172. on 0.2.7.1-alpha.
  2173. - Resolve warnings when building on systems that are concerned with
  2174. signed char. Fixes bug 18728; bugfix on 0.2.7.2-alpha
  2175. and 0.2.6.1-alpha.
  2176. - Silence spurious clang-scan warnings in the ed25519_donna code by
  2177. explicitly initializing some objects. Fixes bug 18384; bugfix on
  2178. 0.2.7.2-alpha. Patch by teor.
  2179. - When libscrypt.h is found, but no libscrypt library can be linked,
  2180. treat libscrypt as absent. Fixes bug 19161; bugfix
  2181. on 0.2.6.1-alpha.
  2182. - Cause the unit tests to compile correctly on mingw64 versions that
  2183. lack sscanf. Fixes bug 19213; bugfix on 0.2.7.1-alpha.
  2184. - Don't try to use the pthread_condattr_setclock() function unless
  2185. it actually exists. Fixes compilation on NetBSD-6.x. Fixes bug
  2186. 17819; bugfix on 0.2.6.3-alpha.
  2187. - Fix backtrace compilation on FreeBSD. Fixes bug 17827; bugfix
  2188. on 0.2.5.2-alpha.
  2189. - Fix search for libevent libraries on OpenBSD (and other systems
  2190. that install libevent 1 and libevent 2 in parallel). Fixes bug
  2191. 16651; bugfix on 0.1.0.7-rc. Patch from "rubiate".
  2192. - Isolate environment variables meant for tests from the rest of the
  2193. build system. Fixes bug 17818; bugfix on 0.2.7.3-rc.
  2194. - Mark all object files that include micro-revision.i as depending
  2195. on it, so as to make parallel builds more reliable. Fixes bug
  2196. 17826; bugfix on 0.2.5.1-alpha.
  2197. - Remove config.log only from make distclean, not from make clean.
  2198. Fixes bug 17924; bugfix on 0.2.4.1-alpha.
  2199. - Replace usage of 'INLINE' with 'inline'. Fixes bug 17804; bugfix
  2200. on 0.0.2pre8.
  2201. - Remove an #endif from configure.ac so that we correctly detect the
  2202. presence of in6_addr.s6_addr32. Fixes bug 17923; bugfix
  2203. on 0.2.0.13-alpha.
  2204. o Minor bugfixes (client, bootstrap):
  2205. - Count receipt of new microdescriptors as progress towards
  2206. bootstrapping. Previously, with EntryNodes set, Tor might not
  2207. successfully repopulate the guard set on bootstrapping. Fixes bug
  2208. 16825; bugfix on 0.2.3.1-alpha.
  2209. o Minor bugfixes (code correctness):
  2210. - Fix a bad memory handling bug that would occur if we had queued a
  2211. cell on a channel's incoming queue. Fortunately, we can't actually
  2212. queue a cell like that as our code is constructed today, but it's
  2213. best to avoid this kind of error, even if there isn't any code
  2214. that triggers it today. Fixes bug 18570; bugfix on 0.2.4.4-alpha.
  2215. - Assert that allocated memory held by the reputation code is freed
  2216. according to its internal counters. Fixes bug 17753; bugfix
  2217. on 0.1.1.1-alpha.
  2218. - Assert when the TLS contexts fail to initialize. Fixes bug 17683;
  2219. bugfix on 0.0.6.
  2220. - Update to the latest version of Trunnel, which tries harder to
  2221. avoid generating code that can invoke memcpy(p,NULL,0). Bug found
  2222. by clang address sanitizer. Fixes bug 18373; bugfix
  2223. on 0.2.7.2-alpha.
  2224. - When closing an entry connection, generate a warning if we should
  2225. have sent an end cell for it but we haven't. Fixes bug 17876;
  2226. bugfix on 0.2.3.2-alpha.
  2227. o Minor bugfixes (configuration):
  2228. - Fix a tiny memory leak when parsing a port configuration ending in
  2229. ":auto". Fixes bug 18374; bugfix on 0.2.3.3-alpha.
  2230. o Minor bugfixes (containers):
  2231. - If we somehow attempt to construct a heap with more than
  2232. 1073741822 elements, avoid an integer overflow when maintaining
  2233. the heap property. Fixes bug 18296; bugfix on 0.1.2.1-alpha.
  2234. o Minor bugfixes (controller, microdescriptors):
  2235. - Make GETINFO dir/status-vote/current/consensus conform to the
  2236. control specification by returning "551 Could not open cached
  2237. consensus..." when not caching consensuses. Fixes bug 18920;
  2238. bugfix on 0.2.2.6-alpha.
  2239. o Minor bugfixes (crypto):
  2240. - Check the return value of HMAC() and assert on failure. Fixes bug
  2241. 17658; bugfix on 0.2.3.6-alpha. Patch by teor.
  2242. o Minor bugfixes (directories):
  2243. - When fetching extrainfo documents, compare their SHA256 digests
  2244. and Ed25519 signing key certificates with the routerinfo that led
  2245. us to fetch them, rather than with the most recent routerinfo.
  2246. Otherwise we generate many spurious warnings about mismatches.
  2247. Fixes bug 17150; bugfix on 0.2.7.2-alpha.
  2248. - When generating a URL for a directory server on an IPv6 address,
  2249. wrap the IPv6 address in square brackets. Fixes bug 18051; bugfix
  2250. on 0.2.3.9-alpha. Patch from Malek.
  2251. o Minor bugfixes (downloading):
  2252. - Predict more correctly whether we'll be downloading over HTTP when
  2253. we determine the maximum length of a URL. This should avoid a
  2254. "BUG" warning about the Squid HTTP proxy and its URL limits. Fixes
  2255. bug 19191.
  2256. o Minor bugfixes (exit policies, security):
  2257. - Refresh an exit relay's exit policy when interface addresses
  2258. change. Previously, tor only refreshed the exit policy when the
  2259. configured external address changed. Fixes bug 18208; bugfix on
  2260. 0.2.7.3-rc. Patch by teor.
  2261. o Minor bugfixes (fallback directories):
  2262. - Mark fallbacks as "too busy" when they return a 503 response,
  2263. rather than just marking authorities. Fixes bug 17572; bugfix on
  2264. 0.2.4.7-alpha. Patch by teor.
  2265. - When requesting extrainfo descriptors from a trusted directory
  2266. server, check whether it is an authority or a fallback directory
  2267. which supports extrainfo descriptors. Fixes bug 18489; bugfix on
  2268. 0.2.4.7-alpha. Reported by atagar, patch by teor.
  2269. o Minor bugfixes (hidden service, client):
  2270. - Handle the case where the user makes several fast consecutive
  2271. requests to the same .onion address. Previously, the first six
  2272. requests would each trigger a descriptor fetch, each picking a
  2273. directory (there are 6 overall) and the seventh one would fail
  2274. because no directories were left, thereby triggering a close on
  2275. all current directory connections asking for the hidden service.
  2276. The solution here is to not close the connections if we have
  2277. pending directory fetches. Fixes bug 15937; bugfix
  2278. on 0.2.7.1-alpha.
  2279. o Minor bugfixes (hidden service, control port):
  2280. - Add the onion address to the HS_DESC event for the UPLOADED action
  2281. both on success or failure. It was previously hardcoded with
  2282. UNKNOWN. Fixes bug 16023; bugfix on 0.2.7.2-alpha.
  2283. o Minor bugfixes (hidden service, directory):
  2284. - Bridges now refuse "rendezvous2" (hidden service descriptor)
  2285. publish attempts. Suggested by ticket 18332.
  2286. o Minor bugfixes (IPv6):
  2287. - Update the limits in max_dl_per_request for IPv6 address length.
  2288. Fixes bug 17573; bugfix on 0.2.1.5-alpha.
  2289. o Minor bugfixes (Linux seccomp2 sandbox):
  2290. - Allow more syscalls when running with "Sandbox 1" enabled:
  2291. sysinfo, getsockopt(SO_SNDBUF), and setsockopt(SO_SNDBUFFORCE). On
  2292. some systems, these are required for Tor to start. Fixes bug
  2293. 18397; bugfix on 0.2.5.1-alpha. Patch from Daniel Pinto.
  2294. - Allow IPPROTO_UDP datagram sockets when running with "Sandbox 1",
  2295. so that get_interface_address6_via_udp_socket_hack() can work.
  2296. Fixes bug 19660; bugfix on 0.2.5.1-alpha.
  2297. - Allow the setrlimit syscall, and the prlimit and prlimit64
  2298. syscalls, which some libc implementations use under the hood.
  2299. Fixes bug 15221; bugfix on 0.2.5.1-alpha.
  2300. - Avoid a 10-second delay when starting as a client with "Sandbox 1"
  2301. enabled and no DNS resolvers configured. This should help TAILS
  2302. start up faster. Fixes bug 18548; bugfix on 0.2.5.1-alpha.
  2303. - Fix a crash when using offline master ed25519 keys with the Linux
  2304. seccomp2 sandbox enabled. Fixes bug 17675; bugfix on 0.2.7.3-rc.
  2305. - Allow statistics to be written to disk when "Sandbox 1" is
  2306. enabled. Fixes bugs 19556 and 19957; bugfix on 0.2.5.1-alpha and
  2307. 0.2.6.1-alpha respectively.
  2308. o Minor bugfixes (logging):
  2309. - In log messages that include a function name, use __FUNCTION__
  2310. instead of __PRETTY_FUNCTION__. In GCC, these are synonymous, but
  2311. with clang __PRETTY_FUNCTION__ has extra information we don't
  2312. need. Fixes bug 16563; bugfix on 0.0.2pre8. Fix by Tom van
  2313. der Woerdt.
  2314. - Remove needless quotes from a log message about unparseable
  2315. addresses. Fixes bug 17843; bugfix on 0.2.3.3-alpha.
  2316. - Scrub service name in "unrecognized service ID" log messages.
  2317. Fixes bug 18600; bugfix on 0.2.4.11-alpha.
  2318. - When logging information about an unparsable networkstatus vote or
  2319. consensus, do not say "vote" when we mean consensus. Fixes bug
  2320. 18368; bugfix on 0.2.0.8-alpha.
  2321. - When we can't generate a signing key because OfflineMasterKey is
  2322. set, do not imply that we should have been able to load it. Fixes
  2323. bug 18133; bugfix on 0.2.7.2-alpha.
  2324. - When logging a malformed hostname received through socks4, scrub
  2325. it if SafeLogging says we should. Fixes bug 17419; bugfix
  2326. on 0.1.1.16-rc.
  2327. o Minor bugfixes (memory safety):
  2328. - Avoid freeing an uninitialized pointer when opening a socket fails
  2329. in get_interface_addresses_ioctl(). Fixes bug 18454; bugfix on
  2330. 0.2.3.11-alpha. Reported by toralf and "cypherpunks", patch
  2331. by teor.
  2332. - Fix a memory leak in "tor --list-fingerprint". Fixes part of bug
  2333. 18672; bugfix on 0.2.5.1-alpha.
  2334. - Fix a memory leak in tor-gencert. Fixes part of bug 18672; bugfix
  2335. on 0.2.0.1-alpha.
  2336. o Minor bugfixes (pluggable transports):
  2337. - Avoid reporting a spurious error when we decide that we don't need
  2338. to terminate a pluggable transport because it has already exited.
  2339. Fixes bug 18686; bugfix on 0.2.5.5-alpha.
  2340. o Minor bugfixes (pointer arithmetic):
  2341. - Fix a bug in memarea_alloc() that could have resulted in remote
  2342. heap write access, if Tor had ever passed an unchecked size to
  2343. memarea_alloc(). Fortunately, all the sizes we pass to
  2344. memarea_alloc() are pre-checked to be less than 128 kilobytes.
  2345. Fixes bug 19150; bugfix on 0.2.1.1-alpha. Bug found by
  2346. Guido Vranken.
  2347. o Minor bugfixes (private directory):
  2348. - Prevent a race condition when creating private directories. Fixes
  2349. part of bug 17852; bugfix on 0.0.2pre13. Part of ticket 17852.
  2350. Patch from jsturgix. Found with Flawfinder.
  2351. o Minor bugfixes (relays):
  2352. - Check that both the ORPort and DirPort (if present) are reachable
  2353. before publishing a relay descriptor. Otherwise, relays publish a
  2354. descriptor with DirPort 0 when the DirPort reachability test takes
  2355. longer than the ORPort reachability test. Fixes bug 18050; bugfix
  2356. on 0.1.0.1-rc. Reported by "starlight", patch by teor.
  2357. - Resolve some edge cases where we might launch an ORPort
  2358. reachability check even when DisableNetwork is set. Noticed while
  2359. fixing bug 18616; bugfix on 0.2.3.9-alpha.
  2360. o Minor bugfixes (relays, hidden services):
  2361. - Refuse connection requests to private OR addresses unless
  2362. ExtendAllowPrivateAddresses is set. Previously, tor would connect,
  2363. then refuse to send any cells to a private address. Fixes bugs
  2364. 17674 and 8976; bugfix on 0.2.3.21-rc. Patch by teor.
  2365. o Minor bugfixes (security, hidden services):
  2366. - Prevent hidden services connecting to client-supplied rendezvous
  2367. addresses that are reserved as internal or multicast. Fixes bug
  2368. 8976; bugfix on 0.2.3.21-rc. Patch by dgoulet and teor.
  2369. o Minor bugfixes (statistics):
  2370. - Consistently check for overflow in round_*_to_next_multiple_of
  2371. functions, and add unit tests with additional and maximal values.
  2372. Fixes part of bug 13192; bugfix on 0.2.2.1-alpha.
  2373. - Handle edge cases in the laplace functions: avoid division by
  2374. zero, avoid taking the log of zero, and silence clang type
  2375. conversion warnings using round and trunc. Add unit tests for edge
  2376. cases with maximal values. Fixes part of bug 13192; bugfix
  2377. on 0.2.6.2-alpha.
  2378. - We now include consensus downloads via IPv6 in our directory-
  2379. request statistics. Fixes bug 18460; bugfix on 0.2.3.14-alpha.
  2380. o Minor bugfixes (test networks, IPv6):
  2381. - Allow internal IPv6 addresses in descriptors in test networks.
  2382. Fixes bug 17153; bugfix on 0.2.3.16-alpha. Patch by teor, reported
  2383. by karsten.
  2384. o Minor bugfixes (testing):
  2385. - Check the full results of SHA256 and SHA512 digests in the unit
  2386. tests. Bugfix on 0.2.2.4-alpha. Patch by teor.
  2387. - Fix a memory leak in the ntor test. Fixes bug 17778; bugfix
  2388. on 0.2.4.8-alpha.
  2389. - Fix a small memory leak that would occur when the
  2390. TestingEnableCellStatsEvent option was turned on. Fixes bug 18673;
  2391. bugfix on 0.2.5.2-alpha.
  2392. - Make unit tests pass on IPv6-only systems, and systems without
  2393. localhost addresses (like some FreeBSD jails). Fixes bug 17632;
  2394. bugfix on 0.2.7.3-rc. Patch by teor.
  2395. - The test for log_heartbeat was incorrectly failing in timezones
  2396. with non-integer offsets. Instead of comparing the end of the time
  2397. string against a constant, compare it to the output of
  2398. format_local_iso_time when given the correct input. Fixes bug
  2399. 18039; bugfix on 0.2.5.4-alpha.
  2400. - We no longer disable assertions in the unit tests when coverage is
  2401. enabled. Instead, we require you to say --disable-asserts-in-tests
  2402. to the configure script if you need assertions disabled in the
  2403. unit tests (for example, if you want to perform branch coverage).
  2404. Fixes bug 18242; bugfix on 0.2.7.1-alpha.
  2405. o Minor bugfixes (time handling):
  2406. - When correcting a corrupt 'struct tm' value, fill in the tm_wday
  2407. field. Otherwise, our unit tests crash on Windows. Fixes bug
  2408. 18977; bugfix on 0.2.2.25-alpha.
  2409. - Avoid overflow in tor_timegm when parsing dates in and after 2038
  2410. on platforms with 32-bit time_t. Fixes bug 18479; bugfix on
  2411. 0.0.2pre14. Patch by teor.
  2412. o Minor bugfixes (tor-gencert):
  2413. - Correctly handle the case where an authority operator enters a
  2414. passphrase but sends an EOF before sending a newline. Fixes bug
  2415. 17443; bugfix on 0.2.0.20-rc. Found by junglefowl.
  2416. o Code simplification and refactoring:
  2417. - Clean up a little duplicated code in
  2418. crypto_expand_key_material_TAP(). Closes ticket 17587; patch
  2419. from "pfrankw".
  2420. - Decouple the list of streams waiting to be attached to circuits
  2421. from the overall connection list. This change makes it possible to
  2422. attach streams quickly while simplifying Tor's callgraph and
  2423. avoiding O(N) scans of the entire connection list. Closes
  2424. ticket 17590.
  2425. - Extract the more complicated parts of circuit_mark_for_close()
  2426. into a new function that we run periodically before circuits are
  2427. freed. This change removes more than half of the functions
  2428. currently in the "blob". Closes ticket 17218.
  2429. - Move logging of redundant policy entries in
  2430. policies_parse_exit_policy_internal into its own function. Closes
  2431. ticket 17608; patch from "juce".
  2432. - Quote all the string interpolations in configure.ac -- even those
  2433. which we are pretty sure can't contain spaces. Closes ticket
  2434. 17744. Patch from zerosion.
  2435. - Remove code for configuring OpenSSL dynamic locks; OpenSSL doesn't
  2436. use them. Closes ticket 17926.
  2437. - Remove specialized code for non-inplace AES_CTR. 99% of our AES is
  2438. inplace, so there's no need to have a separate implementation for
  2439. the non-inplace code. Closes ticket 18258. Patch from Malek.
  2440. - Simplify return types for some crypto functions that can't
  2441. actually fail. Patch from Hassan Alsibyani. Closes ticket 18259.
  2442. - When a direct directory request fails immediately on launch,
  2443. instead of relaunching that request from inside the code that
  2444. launches it, instead mark the connection for teardown. This change
  2445. simplifies Tor's callback and prevents the directory-request
  2446. launching code from invoking itself recursively. Closes
  2447. ticket 17589.
  2448. o Documentation:
  2449. - Add a description of the correct use of the '--keygen' command-
  2450. line option. Closes ticket 17583; based on text by 's7r'.
  2451. - Change build messages to refer to "Fedora" instead of "Fedora
  2452. Core", and "dnf" instead of "yum". Closes tickets 18459 and 18426.
  2453. Patches from "icanhasaccount" and "cypherpunks".
  2454. - Document the contents of the 'datadir/keys' subdirectory in the
  2455. manual page. Closes ticket 17621.
  2456. - Document the minimum HeartbeatPeriod value. Closes ticket 15638.
  2457. - Explain actual minima for BandwidthRate. Closes ticket 16382.
  2458. - Fix a minor formatting typo in the manpage. Closes ticket 17791.
  2459. - Mention torspec URL in the manpage and point the reader to it
  2460. whenever we mention a document that belongs in torspce. Fixes
  2461. issue 17392.
  2462. - Stop recommending use of nicknames to identify relays in our
  2463. MapAddress documentation. Closes ticket 18312.
  2464. o Removed features:
  2465. - Remove client-side support for connecting to Tor relays running
  2466. versions of Tor before 0.2.3.6-alpha. These relays didn't support
  2467. the v3 TLS handshake protocol, and are no longer allowed on the
  2468. Tor network. Implements the client side of ticket 11150. Based on
  2469. patches by Tom van der Woerdt.
  2470. - We no longer maintain an internal freelist in memarea.c.
  2471. Allocators should be good enough to make this code unnecessary,
  2472. and it's doubtful that it ever had any performance benefit.
  2473. o Testing:
  2474. - Add unit tests to check for common RNG failure modes, such as
  2475. returning all zeroes, identical values, or incrementing values
  2476. (OpenSSL's rand_predictable feature). Patch by teor.
  2477. - Always test both ed25519 backends, so that we can be sure that our
  2478. batch-open replacement code works. Part of ticket 16794.
  2479. - Cover dns_resolve_impl() in dns.c with unit tests. Implements a
  2480. portion of ticket 16831.
  2481. - Fix several warnings from clang's address sanitizer produced in
  2482. the unit tests.
  2483. - Log more information when the backtrace tests fail. Closes ticket
  2484. 17892. Patch from "cypherpunks."
  2485. - More unit tests for compat_libevent.c, procmon.c, tortls.c,
  2486. util_format.c, directory.c, and options_validate.c. Closes tickets
  2487. 17075, 17082, 17084, 17003, and 17076 respectively. Patches from
  2488. Ola Bini.
  2489. - Treat backtrace test failures as expected on FreeBSD until we
  2490. solve bug 17808. Closes ticket 18204.
  2491. - Unit tests for directory_handle_command_get. Closes ticket 17004.
  2492. Patch from Reinaldo de Souza Jr.
  2493. Changes in version 0.2.7.6 - 2015-12-10
  2494. Tor version 0.2.7.6 fixes a major bug in entry guard selection, as
  2495. well as a minor bug in hidden service reliability.
  2496. o Major bugfixes (guard selection):
  2497. - Actually look at the Guard flag when selecting a new directory
  2498. guard. When we implemented the directory guard design, we
  2499. accidentally started treating all relays as if they have the Guard
  2500. flag during guard selection, leading to weaker anonymity and worse
  2501. performance. Fixes bug 17772; bugfix on 0.2.4.8-alpha. Discovered
  2502. by Mohsen Imani.
  2503. o Minor features (geoip):
  2504. - Update geoip and geoip6 to the December 1 2015 Maxmind GeoLite2
  2505. Country database.
  2506. o Minor bugfixes (compilation):
  2507. - When checking for net/pfvar.h, include netinet/in.h if possible.
  2508. This fixes transparent proxy detection on OpenBSD. Fixes bug
  2509. 17551; bugfix on 0.1.2.1-alpha. Patch from "rubiate".
  2510. - Fix a compilation warning with Clang 3.6: Do not check the
  2511. presence of an address which can never be NULL. Fixes bug 17781.
  2512. o Minor bugfixes (correctness):
  2513. - When displaying an IPv6 exit policy, include the mask bits
  2514. correctly even when the number is greater than 31. Fixes bug
  2515. 16056; bugfix on 0.2.4.7-alpha. Patch from "gturner".
  2516. - The wrong list was used when looking up expired intro points in a
  2517. rend service object, causing what we think could be reachability
  2518. issues for hidden services, and triggering a BUG log. Fixes bug
  2519. 16702; bugfix on 0.2.7.2-alpha.
  2520. - Fix undefined behavior in the tor_cert_checksig function. Fixes
  2521. bug 17722; bugfix on 0.2.7.2-alpha.
  2522. Changes in version 0.2.7.5 - 2015-11-20
  2523. The Tor 0.2.7 release series is dedicated to the memory of Tor user
  2524. and privacy advocate Caspar Bowden (1961-2015). Caspar worked
  2525. tirelessly to advocate human rights regardless of national borders,
  2526. and oppose the encroachments of mass surveillance. He opposed national
  2527. exceptionalism, he brought clarity to legal and policy debates, he
  2528. understood and predicted the impact of mass surveillance on the world,
  2529. and he laid the groundwork for resisting it. While serving on the Tor
  2530. Project's board of directors, he brought us his uncompromising focus
  2531. on technical excellence in the service of humankind. Caspar was an
  2532. inimitable force for good and a wonderful friend. He was kind,
  2533. humorous, generous, gallant, and believed we should protect one
  2534. another without exception. We honor him here for his ideals, his
  2535. efforts, and his accomplishments. Please honor his memory with works
  2536. that would make him proud.
  2537. Tor 0.2.7.5 is the first stable release in the Tor 0.2.7 series.
  2538. The 0.2.7 series adds a more secure identity key type for relays,
  2539. improves cryptography performance, resolves several longstanding
  2540. hidden-service performance issues, improves controller support for
  2541. hidden services, and includes small bugfixes and performance
  2542. improvements throughout the program. This release series also includes
  2543. more tests than before, and significant simplifications to which parts
  2544. of Tor invoke which others. For a full list of changes, see below.
  2545. o New system requirements:
  2546. - Tor no longer includes workarounds to support Libevent versions
  2547. before 1.3e. Libevent 2.0 or later is recommended. Closes
  2548. ticket 15248.
  2549. - Tor no longer supports copies of OpenSSL that are missing support
  2550. for Elliptic Curve Cryptography. (We began using ECC when
  2551. available in 0.2.4.8-alpha, for more safe and efficient key
  2552. negotiation.) In particular, support for at least one of P256 or
  2553. P224 is now required, with manual configuration needed if only
  2554. P224 is available. Resolves ticket 16140.
  2555. - Tor no longer supports versions of OpenSSL before 1.0. (If you are
  2556. on an operating system that has not upgraded to OpenSSL 1.0 or
  2557. later, and you compile Tor from source, you will need to install a
  2558. more recent OpenSSL to link Tor against.) These versions of
  2559. OpenSSL are still supported by the OpenSSL, but the numerous
  2560. cryptographic improvements in later OpenSSL releases makes them a
  2561. clear choice. Resolves ticket 16034.
  2562. o Major features (controller):
  2563. - Add the ADD_ONION and DEL_ONION commands that allow the creation
  2564. and management of hidden services via the controller. Closes
  2565. ticket 6411.
  2566. - New "GETINFO onions/current" and "GETINFO onions/detached"
  2567. commands to get information about hidden services created via the
  2568. controller. Part of ticket 6411.
  2569. - New HSFETCH command to launch a request for a hidden service
  2570. descriptor. Closes ticket 14847.
  2571. - New HSPOST command to upload a hidden service descriptor. Closes
  2572. ticket 3523. Patch by "DonnchaC".
  2573. o Major features (Ed25519 identity keys, Proposal 220):
  2574. - Add support for offline encrypted Ed25519 master keys. To use this
  2575. feature on your tor relay, run "tor --keygen" to make a new master
  2576. key (or to make a new signing key if you already have a master
  2577. key). Closes ticket 13642.
  2578. - All relays now maintain a stronger identity key, using the Ed25519
  2579. elliptic curve signature format. This master key is designed so
  2580. that it can be kept offline. Relays also generate an online
  2581. signing key, and a set of other Ed25519 keys and certificates.
  2582. These are all automatically regenerated and rotated as needed.
  2583. Implements part of ticket 12498.
  2584. - Directory authorities now vote on Ed25519 identity keys along with
  2585. RSA1024 keys. Implements part of ticket 12498.
  2586. - Directory authorities track which Ed25519 identity keys have been
  2587. used with which RSA1024 identity keys, and do not allow them to
  2588. vary freely. Implements part of ticket 12498.
  2589. - Microdescriptors now include Ed25519 identity keys. Implements
  2590. part of ticket 12498.
  2591. - Add a --newpass option to allow changing or removing the
  2592. passphrase of an encrypted key with tor --keygen. Implements part
  2593. of ticket 16769.
  2594. - Add a new OfflineMasterKey option to tell Tor never to try loading
  2595. or generating a secret Ed25519 identity key. You can use this in
  2596. combination with tor --keygen to manage offline and/or encrypted
  2597. Ed25519 keys. Implements ticket 16944.
  2598. - On receiving a HUP signal, check to see whether the Ed25519
  2599. signing key has changed, and reload it if so. Closes ticket 16790.
  2600. - Significant usability improvements for Ed25519 key management. Log
  2601. messages are better, and the code can recover from far more
  2602. failure conditions. Thanks to "s7r" for reporting and diagnosing
  2603. so many of these!
  2604. o Major features (ECC performance):
  2605. - Improve the runtime speed of Ed25519 signature verification by
  2606. using Ed25519-donna's batch verification support. Implements
  2607. ticket 16533.
  2608. - Improve the speed of Ed25519 operations and Curve25519 keypair
  2609. generation when built targeting 32 bit x86 platforms with SSE2
  2610. available. Implements ticket 16535.
  2611. - Improve the runtime speed of Ed25519 operations by using the
  2612. public-domain Ed25519-donna by Andrew M. ("floodyberry").
  2613. Implements ticket 16467.
  2614. - Improve the runtime speed of the ntor handshake by using an
  2615. optimized curve25519 basepoint scalarmult implementation from the
  2616. public-domain Ed25519-donna by Andrew M. ("floodyberry"), based on
  2617. ideas by Adam Langley. Implements ticket 9663.
  2618. o Major features (Hidden services):
  2619. - Hidden services, if using the EntryNodes option, are required to
  2620. use more than one EntryNode, in order to avoid a guard discovery
  2621. attack. (This would only affect people who had configured hidden
  2622. services and manually specified the EntryNodes option with a
  2623. single entry-node. The impact was that it would be easy to
  2624. remotely identify the guard node used by such a hidden service.
  2625. See ticket for more information.) Fixes ticket 14917.
  2626. - Add the torrc option HiddenServiceNumIntroductionPoints, to
  2627. specify a fixed number of introduction points. Its maximum value
  2628. is 10 and default is 3. Using this option can increase a hidden
  2629. service's reliability under load, at the cost of making it more
  2630. visible that the hidden service is facing extra load. Closes
  2631. ticket 4862.
  2632. - Remove the adaptive algorithm for choosing the number of
  2633. introduction points, which used to change the number of
  2634. introduction points (poorly) depending on the number of
  2635. connections the HS sees. Closes ticket 4862.
  2636. o Major features (onion key cross-certification):
  2637. - Relay descriptors now include signatures of their own identity
  2638. keys, made using the TAP and ntor onion keys. These signatures
  2639. allow relays to prove ownership of their own onion keys. Because
  2640. of this change, microdescriptors will no longer need to include
  2641. RSA identity keys. Implements proposal 228; closes ticket 12499.
  2642. o Major bugfixes (client-side privacy, also in 0.2.6.9):
  2643. - Properly separate out each SOCKSPort when applying stream
  2644. isolation. The error occurred because each port's session group
  2645. was being overwritten by a default value when the listener
  2646. connection was initialized. Fixes bug 16247; bugfix on
  2647. 0.2.6.3-alpha. Patch by "jojelino".
  2648. o Major bugfixes (hidden service clients, stability, also in 0.2.6.10):
  2649. - Stop refusing to store updated hidden service descriptors on a
  2650. client. This reverts commit 9407040c59218 (which indeed fixed bug
  2651. 14219, but introduced a major hidden service reachability
  2652. regression detailed in bug 16381). This is a temporary fix since
  2653. we can live with the minor issue in bug 14219 (it just results in
  2654. some load on the network) but the regression of 16381 is too much
  2655. of a setback. First-round fix for bug 16381; bugfix
  2656. on 0.2.6.3-alpha.
  2657. o Major bugfixes (hidden services):
  2658. - Revert commit that made directory authorities assign the HSDir
  2659. flag to relay without a DirPort; this was bad because such relays
  2660. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  2661. on 0.2.6.3-alpha.
  2662. - When cannibalizing a circuit for an introduction point, always
  2663. extend to the chosen exit node (creating a 4 hop circuit).
  2664. Previously Tor would use the current circuit exit node, which
  2665. changed the original choice of introduction point, and could cause
  2666. the hidden service to skip excluded introduction points or
  2667. reconnect to a skipped introduction point. Fixes bug 16260; bugfix
  2668. on 0.1.0.1-rc.
  2669. o Major bugfixes (memory leaks):
  2670. - Fix a memory leak in ed25519 batch signature checking. Fixes bug
  2671. 17398; bugfix on 0.2.6.1-alpha.
  2672. o Major bugfixes (open file limit):
  2673. - The open file limit wasn't checked before calling
  2674. tor_accept_socket_nonblocking(), which would make Tor exceed the
  2675. limit. Now, before opening a new socket, Tor validates the open
  2676. file limit just before, and if the max has been reached, return an
  2677. error. Fixes bug 16288; bugfix on 0.1.1.1-alpha.
  2678. o Major bugfixes (security, correctness):
  2679. - Fix an error that could cause us to read 4 bytes before the
  2680. beginning of an openssl string. This bug could be used to cause
  2681. Tor to crash on systems with unusual malloc implementations, or
  2682. systems with unusual hardening installed. Fixes bug 17404; bugfix
  2683. on 0.2.3.6-alpha.
  2684. o Major bugfixes (stability, also in 0.2.6.10):
  2685. - Stop crashing with an assertion failure when parsing certain kinds
  2686. of malformed or truncated microdescriptors. Fixes bug 16400;
  2687. bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
  2688. by "cypherpunks_backup".
  2689. - Stop random client-side assertion failures that could occur when
  2690. connecting to a busy hidden service, or connecting to a hidden
  2691. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  2692. on 0.1.0.1-rc.
  2693. o Minor features (client, SOCKS):
  2694. - Add GroupWritable and WorldWritable options to unix-socket based
  2695. SocksPort and ControlPort options. These options apply to a single
  2696. socket, and override {Control,Socks}SocketsGroupWritable. Closes
  2697. ticket 15220.
  2698. - Relax the validation done to hostnames in SOCKS5 requests, and
  2699. allow a single trailing '.' to cope with clients that pass FQDNs
  2700. using that syntax to explicitly indicate that the domain name is
  2701. fully-qualified. Fixes bug 16674; bugfix on 0.2.6.2-alpha.
  2702. - Relax the validation of hostnames in SOCKS5 requests, allowing the
  2703. character '_' to appear, in order to cope with domains observed in
  2704. the wild that are serving non-RFC compliant records. Resolves
  2705. ticket 16430.
  2706. o Minor features (client-side privacy):
  2707. - New KeepAliveIsolateSOCKSAuth option to indefinitely extend circuit
  2708. lifespan when IsolateSOCKSAuth and streams with SOCKS
  2709. authentication are attached to the circuit. This allows
  2710. applications like TorBrowser to manage circuit lifetime on their
  2711. own. Implements feature 15482.
  2712. - When logging malformed hostnames from SOCKS5 requests, respect
  2713. SafeLogging configuration. Fixes bug 16891; bugfix on 0.1.1.16-rc.
  2714. o Minor features (clock-jump tolerance):
  2715. - Recover better when our clock jumps back many hours, like might
  2716. happen for Tails or Whonix users who start with a very wrong
  2717. hardware clock, use Tor to discover a more accurate time, and then
  2718. fix their clock. Resolves part of ticket 8766.
  2719. o Minor features (command-line interface):
  2720. - Make --hash-password imply --hush to prevent unnecessary noise.
  2721. Closes ticket 15542. Patch from "cypherpunks".
  2722. - Print a warning whenever we find a relative file path being used
  2723. as torrc option. Resolves issue 14018.
  2724. o Minor features (compilation):
  2725. - Give a warning as early as possible when trying to build with an
  2726. unsupported OpenSSL version. Closes ticket 16901.
  2727. - Use C99 variadic macros when the compiler is not GCC. This avoids
  2728. failing compilations on MSVC, and fixes a log-file-based race
  2729. condition in our old workarounds. Original patch from Gisle Vanem.
  2730. o Minor features (control protocol):
  2731. - Support network-liveness GETINFO key and NETWORK_LIVENESS event in
  2732. the control protocol. Resolves ticket 15358.
  2733. o Minor features (controller):
  2734. - Add DirAuthority lines for default directory authorities to the
  2735. output of the "GETINFO config/defaults" command if not already
  2736. present. Implements ticket 14840.
  2737. - Controllers can now use "GETINFO hs/client/desc/id/..." to
  2738. retrieve items from the client's hidden service descriptor cache.
  2739. Closes ticket 14845.
  2740. - Implement a new controller command "GETINFO status/fresh-relay-
  2741. descs" to fetch a descriptor/extrainfo pair that was generated on
  2742. demand just for the controller's use. Implements ticket 14784.
  2743. o Minor features (directory authorities):
  2744. - Directory authorities no longer vote against the "Fast", "Stable",
  2745. and "HSDir" flags just because they were going to vote against
  2746. "Running": if the consensus turns out to be that the router was
  2747. running, then the authority's vote should count. Patch from Peter
  2748. Retzlaff; closes issue 8712.
  2749. o Minor features (directory authorities, security, also in 0.2.6.9):
  2750. - The HSDir flag given by authorities now requires the Stable flag.
  2751. For the current network, this results in going from 2887 to 2806
  2752. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  2753. attack by raising the effort for a relay to become Stable to
  2754. require at the very least 7 days, while maintaining the 96 hours
  2755. uptime requirement for HSDir. Implements ticket 8243.
  2756. o Minor features (DoS-resistance):
  2757. - Make it harder for attackers to overload hidden services with
  2758. introductions, by blocking multiple introduction requests on the
  2759. same circuit. Resolves ticket 15515.
  2760. o Minor features (geoip):
  2761. - Update geoip and geoip6 to the October 9 2015 Maxmind GeoLite2
  2762. Country database.
  2763. o Minor features (hidden services):
  2764. - Add the new options "HiddenServiceMaxStreams" and
  2765. "HiddenServiceMaxStreamsCloseCircuit" to allow hidden services to
  2766. limit the maximum number of simultaneous streams per circuit, and
  2767. optionally tear down the circuit when the limit is exceeded. Part
  2768. of ticket 16052.
  2769. - Client now uses an introduction point failure cache to know when
  2770. to fetch or keep a descriptor in their cache. Previously, failures
  2771. were recorded implicitly, but not explicitly remembered. Closes
  2772. ticket 16389.
  2773. - Relays need to have the Fast flag to get the HSDir flag. As this
  2774. is being written, we'll go from 2745 HSDirs down to 2342, a ~14%
  2775. drop. This change should make some attacks against the hidden
  2776. service directory system harder. Fixes ticket 15963.
  2777. - Turn on hidden service statistics collection by setting the torrc
  2778. option HiddenServiceStatistics to "1" by default. (This keeps
  2779. track only of the fraction of traffic used by hidden services, and
  2780. the total number of hidden services in existence.) Closes
  2781. ticket 15254.
  2782. - To avoid leaking HS popularity, don't cycle the introduction point
  2783. when we've handled a fixed number of INTRODUCE2 cells but instead
  2784. cycle it when a random number of introductions is reached, thus
  2785. making it more difficult for an attacker to find out the amount of
  2786. clients that have used the introduction point for a specific HS.
  2787. Closes ticket 15745.
  2788. o Minor features (logging):
  2789. - Include the Tor version in all LD_BUG log messages, since people
  2790. tend to cut and paste those into the bugtracker. Implements
  2791. ticket 15026.
  2792. o Minor features (pluggable transports):
  2793. - When launching managed pluggable transports on Linux systems,
  2794. attempt to have the kernel deliver a SIGTERM on tor exit if the
  2795. pluggable transport process is still running. Resolves
  2796. ticket 15471.
  2797. - When launching managed pluggable transports, setup a valid open
  2798. stdin in the child process that can be used to detect if tor has
  2799. terminated. The "TOR_PT_EXIT_ON_STDIN_CLOSE" environment variable
  2800. can be used by implementations to detect this new behavior.
  2801. Resolves ticket 15435.
  2802. o Minor bugfixes (torrc exit policies):
  2803. - In each instance above, usage advice is provided to avoid the
  2804. message. Resolves ticket 16069. Patch by "teor". Fixes part of bug
  2805. 16069; bugfix on 0.2.4.7-alpha.
  2806. - In torrc, "accept6 *" and "reject6 *" ExitPolicy lines now only
  2807. produce IPv6 wildcard addresses. Previously they would produce
  2808. both IPv4 and IPv6 wildcard addresses. Patch by "teor". Fixes part
  2809. of bug 16069; bugfix on 0.2.4.7-alpha.
  2810. - When parsing torrc ExitPolicies, we now issue an info-level
  2811. message when expanding an "accept/reject *" line to include both
  2812. IPv4 and IPv6 wildcard addresses. Related to ticket 16069.
  2813. - When parsing torrc ExitPolicies, we now warn for a number of cases
  2814. where the user's intent is likely to differ from Tor's actual
  2815. behavior. These include: using an IPv4 address with an accept6 or
  2816. reject6 line; using "private" on an accept6 or reject6 line; and
  2817. including any ExitPolicy lines after accept *:* or reject *:*.
  2818. Related to ticket 16069.
  2819. o Minor bugfixes (command-line interface):
  2820. - When "--quiet" is provided along with "--validate-config", do not
  2821. write anything to stdout on success. Fixes bug 14994; bugfix
  2822. on 0.2.3.3-alpha.
  2823. - When complaining about bad arguments to "--dump-config", use
  2824. stderr, not stdout.
  2825. - Print usage information for --dump-config when it is used without
  2826. an argument. Also, fix the error message to use different wording
  2827. and add newline at the end. Fixes bug 15541; bugfix
  2828. on 0.2.5.1-alpha.
  2829. o Minor bugfixes (compilation):
  2830. - Fix compilation of sandbox.c with musl-libc. Fixes bug 17347;
  2831. bugfix on 0.2.5.1-alpha. Patch from 'jamestk'.
  2832. - Repair compilation with the most recent (unreleased, alpha)
  2833. vesions of OpenSSL 1.1. Fixes part of ticket 17237.
  2834. o Minor bugfixes (compilation, also in 0.2.6.9):
  2835. - Build with --enable-systemd correctly when libsystemd is
  2836. installed, but systemd is not. Fixes bug 16164; bugfix on
  2837. 0.2.6.3-alpha. Patch from Peter Palfrader.
  2838. o Minor bugfixes (configuration, unit tests):
  2839. - Only add the default fallback directories when the DirAuthorities,
  2840. AlternateDirAuthority, and FallbackDir directory config options
  2841. are set to their defaults. The default fallback directory list is
  2842. currently empty, this fix will only change tor's behavior when it
  2843. has default fallback directories. Includes unit tests for
  2844. consider_adding_dir_servers(). Fixes bug 15642; bugfix on
  2845. 90f6071d8dc0 in 0.2.4.7-alpha. Patch by "teor".
  2846. o Minor bugfixes (controller):
  2847. - Add the descriptor ID in each HS_DESC control event. It was
  2848. missing, but specified in control-spec.txt. Fixes bug 15881;
  2849. bugfix on 0.2.5.2-alpha.
  2850. o Minor bugfixes (correctness):
  2851. - For correctness, avoid modifying a constant string in
  2852. handle_control_postdescriptor. Fixes bug 15546; bugfix
  2853. on 0.1.1.16-rc.
  2854. - Remove side-effects from tor_assert() calls. This was harmless,
  2855. because we never disable assertions, but it is bad style and
  2856. unnecessary. Fixes bug 15211; bugfix on 0.2.5.5, 0.2.2.36,
  2857. and 0.2.0.10.
  2858. - When calling channel_free_list(), avoid calling smartlist_remove()
  2859. while inside a FOREACH loop. This partially reverts commit
  2860. 17356fe7fd96af where the correct SMARTLIST_DEL_CURRENT was
  2861. incorrectly removed. Fixes bug 16924; bugfix on 0.2.4.4-alpha.
  2862. o Minor bugfixes (crypto error-handling, also in 0.2.6.10):
  2863. - Check for failures from crypto_early_init, and refuse to continue.
  2864. A previous typo meant that we could keep going with an
  2865. uninitialized crypto library, and would have OpenSSL initialize
  2866. its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
  2867. when implementing ticket 4900. Patch by "teor".
  2868. o Minor bugfixes (hidden service):
  2869. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  2870. a client authorized hidden service. Fixes bug 15823; bugfix
  2871. on 0.2.1.6-alpha.
  2872. - Remove an extraneous newline character from the end of hidden
  2873. service descriptors. Fixes bug 15296; bugfix on 0.2.0.10-alpha.
  2874. o Minor bugfixes (Linux seccomp2 sandbox):
  2875. - Use the sandbox in tor_open_cloexec whether or not O_CLOEXEC is
  2876. defined. Patch by "teor". Fixes bug 16515; bugfix on 0.2.3.1-alpha.
  2877. - Allow bridge authorities to run correctly under the seccomp2
  2878. sandbox. Fixes bug 16964; bugfix on 0.2.5.1-alpha.
  2879. - Add the "hidserv-stats" filename to our sandbox filter for the
  2880. HiddenServiceStatistics option to work properly. Fixes bug 17354;
  2881. bugfix on 0.2.6.2-alpha. Patch from David Goulet.
  2882. o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.10):
  2883. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  2884. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  2885. on 0.2.6.3-alpha. Patch from "teor".
  2886. o Minor bugfixes (Linux seccomp2 sandbox, also in 0.2.6.9):
  2887. - Allow systemd connections to work with the Linux seccomp2 sandbox
  2888. code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
  2889. Peter Palfrader.
  2890. - Fix sandboxing to work when running as a relay, by allowing the
  2891. renaming of secret_id_key, and allowing the eventfd2 and futex
  2892. syscalls. Fixes bug 16244; bugfix on 0.2.6.1-alpha. Patch by
  2893. Peter Palfrader.
  2894. o Minor bugfixes (logging):
  2895. - When building Tor under Clang, do not include an extra set of
  2896. parentheses in log messages that include function names. Fixes bug
  2897. 15269; bugfix on every released version of Tor when compiled with
  2898. recent enough Clang.
  2899. o Minor bugfixes (network):
  2900. - When attempting to use fallback technique for network interface
  2901. lookup, disregard loopback and multicast addresses since they are
  2902. unsuitable for public communications.
  2903. o Minor bugfixes (open file limit):
  2904. - Fix set_max_file_descriptors() to set by default the max open file
  2905. limit to the current limit when setrlimit() fails. Fixes bug
  2906. 16274; bugfix on tor- 0.2.0.10-alpha. Patch by dgoulet.
  2907. o Minor bugfixes (portability):
  2908. - Check correctly for Windows socket errors in the workqueue
  2909. backend. Fixes bug 16741; bugfix on 0.2.6.3-alpha.
  2910. - Try harder to normalize the exit status of the Tor process to the
  2911. standard-provided range. Fixes bug 16975; bugfix on every version
  2912. of Tor ever.
  2913. - Use libexecinfo on FreeBSD to enable backtrace support. Fixes part
  2914. of bug 17151; bugfix on 0.2.5.2-alpha. Patch from Marcin Cieślak.
  2915. o Minor bugfixes (relay):
  2916. - Ensure that worker threads actually exit when a fatal error or
  2917. shutdown is indicated. This fix doesn't currently affect the
  2918. behavior of Tor, because Tor workers never indicates fatal error
  2919. or shutdown except in the unit tests. Fixes bug 16868; bugfix
  2920. on 0.2.6.3-alpha.
  2921. - Fix a rarely-encountered memory leak when failing to initialize
  2922. the thread pool. Fixes bug 16631; bugfix on 0.2.6.3-alpha. Patch
  2923. from "cypherpunks".
  2924. - Unblock threads before releasing the work queue mutex to ensure
  2925. predictable scheduling behavior. Fixes bug 16644; bugfix
  2926. on 0.2.6.3-alpha.
  2927. o Minor bugfixes (security, exit policies):
  2928. - ExitPolicyRejectPrivate now also rejects the relay's published
  2929. IPv6 address (if any), and any publicly routable IPv4 or IPv6
  2930. addresses on any local interfaces. ticket 17027. Patch by "teor".
  2931. Fixes bug 17027; bugfix on 0.2.0.11-alpha.
  2932. o Minor bugfixes (statistics):
  2933. - Disregard the ConnDirectionStatistics torrc options when Tor is
  2934. not a relay since in that mode of operation no sensible data is
  2935. being collected and because Tor might run into measurement hiccups
  2936. when running as a client for some time, then becoming a relay.
  2937. Fixes bug 15604; bugfix on 0.2.2.35.
  2938. o Minor bugfixes (systemd):
  2939. - Tor's systemd unit file no longer contains extraneous spaces.
  2940. These spaces would sometimes confuse tools like deb-systemd-
  2941. helper. Fixes bug 16162; bugfix on 0.2.5.5-alpha.
  2942. o Minor bugfixes (test networks):
  2943. - When self-testing reachability, use ExtendAllowPrivateAddresses to
  2944. determine if local/private addresses imply reachability. The
  2945. previous fix used TestingTorNetwork, which implies
  2946. ExtendAllowPrivateAddresses, but this excluded rare configurations
  2947. where ExtendAllowPrivateAddresses is set but TestingTorNetwork is
  2948. not. Fixes bug 15771; bugfix on 0.2.6.1-alpha. Patch by "teor",
  2949. issue discovered by CJ Ess.
  2950. o Minor bugfixes (tests, also in 0.2.6.9):
  2951. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  2952. 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
  2953. o Code simplification and refactoring:
  2954. - Change the function that's called when we need to retry all
  2955. downloads so that it only reschedules the downloads to happen
  2956. immediately, rather than launching them all at once itself. This
  2957. further simplifies Tor's callgraph.
  2958. - Define WINVER and _WIN32_WINNT centrally, in orconfig.h, in order
  2959. to ensure they remain consistent and visible everywhere.
  2960. - Move some format-parsing functions out of crypto.c and
  2961. crypto_curve25519.c into crypto_format.c and/or util_format.c.
  2962. - Move the client-only parts of init_keys() into a separate
  2963. function. Closes ticket 16763.
  2964. - Move the hacky fallback code out of get_interface_address6() into
  2965. separate function and get it covered with unit-tests. Resolves
  2966. ticket 14710.
  2967. - Refactor hidden service client-side cache lookup to intelligently
  2968. report its various failure cases, and disentangle failure cases
  2969. involving a lack of introduction points. Closes ticket 14391.
  2970. - Remove some vestigial workarounds for the MSVC6 compiler. We
  2971. haven't supported that in ages.
  2972. - Remove the unused "nulterminate" argument from buf_pullup().
  2973. - Simplify the microdesc_free() implementation so that it no longer
  2974. appears (to code analysis tools) to potentially invoke a huge
  2975. suite of other microdesc functions.
  2976. - Simply the control graph further by deferring the inner body of
  2977. directory_all_unreachable() into a callback. Closes ticket 16762.
  2978. - The link authentication code has been refactored for better
  2979. testability and reliability. It now uses code generated with the
  2980. "trunnel" binary encoding generator, to reduce the risk of bugs
  2981. due to programmer error. Done as part of ticket 12498.
  2982. - Treat the loss of an owning controller as equivalent to a SIGTERM
  2983. signal. This removes a tiny amount of duplicated code, and
  2984. simplifies our callgraph. Closes ticket 16788.
  2985. - Use our own Base64 encoder instead of OpenSSL's, to allow more
  2986. control over the output. Part of ticket 15652.
  2987. - When generating an event to send to the controller, we no longer
  2988. put the event over the network immediately. Instead, we queue
  2989. these events, and use a Libevent callback to deliver them. This
  2990. change simplifies Tor's callgraph by reducing the number of
  2991. functions from which all other Tor functions are reachable. Closes
  2992. ticket 16695.
  2993. - Wrap Windows-only C files inside '#ifdef _WIN32' so that tools
  2994. that try to scan or compile every file on Unix won't decide that
  2995. they are broken.
  2996. o Documentation:
  2997. - Fix capitalization of SOCKS in sample torrc. Closes ticket 15609.
  2998. - Improve the descriptions of statistics-related torrc options in
  2999. the manpage to describe rationale and possible uses cases. Fixes
  3000. issue 15550.
  3001. - Improve the layout and formatting of ./configure --help messages.
  3002. Closes ticket 15024. Patch from "cypherpunks".
  3003. - Include a specific and (hopefully) accurate documentation of the
  3004. torrc file's meta-format in doc/torrc_format.txt. This is mainly
  3005. of interest to people writing programs to parse or generate torrc
  3006. files. This document is not a commitment to long-term
  3007. compatibility; some aspects of the current format are a bit
  3008. ridiculous. Closes ticket 2325.
  3009. - Include the TUNING document in our source tarball. It is referred
  3010. to in the ChangeLog and an error message. Fixes bug 16929; bugfix
  3011. on 0.2.6.1-alpha.
  3012. - Note that HiddenServicePorts can take a unix domain socket. Closes
  3013. ticket 17364.
  3014. - Recommend a 40 GB example AccountingMax in torrc.sample rather
  3015. than a 4 GB max. Closes ticket 16742.
  3016. - Standardize on the term "server descriptor" in the manual page.
  3017. Previously, we had used "router descriptor", "server descriptor",
  3018. and "relay descriptor" interchangeably. Part of ticket 14987.
  3019. - Advise users on how to configure separate IPv4 and IPv6 exit
  3020. policies in the manpage and sample torrcs. Related to ticket 16069.
  3021. - Fix an error in the manual page and comments for
  3022. TestingDirAuthVoteHSDir[IsStrict], which suggested that a HSDir
  3023. required "ORPort connectivity". While this is true, it is in no
  3024. way unique to the HSDir flag. Of all the flags, only HSDirs need a
  3025. DirPort configured in order for the authorities to assign that
  3026. particular flag. Patch by "teor". Fixed as part of 14882; bugfix
  3027. on 0.2.6.3-alpha.
  3028. - Fix the usage message of tor-resolve(1) so that it no longer lists
  3029. the removed -F option. Fixes bug 16913; bugfix on 0.2.2.28-beta.
  3030. o Removed code:
  3031. - Remove `USE_OPENSSL_BASE64` and the corresponding fallback code
  3032. and always use the internal Base64 decoder. The internal decoder
  3033. has been part of tor since 0.2.0.10-alpha, and no one should
  3034. be using the OpenSSL one. Part of ticket 15652.
  3035. - Remove the 'tor_strclear()' function; use memwipe() instead.
  3036. Closes ticket 14922.
  3037. - Remove the code that would try to aggressively flush controller
  3038. connections while writing to them. This code was introduced in
  3039. 0.1.2.7-alpha, in order to keep output buffers from exceeding
  3040. their limits. But there is no longer a maximum output buffer size,
  3041. and flushing data in this way caused some undesirable recursions
  3042. in our call graph. Closes ticket 16480.
  3043. - The internal pure-C tor-fw-helper tool is now removed from the Tor
  3044. distribution, in favor of the pure-Go clone available from
  3045. https://gitweb.torproject.org/tor-fw-helper.git/ . The libraries
  3046. used by the C tor-fw-helper are not, in our opinion, very
  3047. confidence- inspiring in their secure-programming techniques.
  3048. Closes ticket 13338.
  3049. o Removed features:
  3050. - Remove the (seldom-used) DynamicDHGroups feature. For anti-
  3051. fingerprinting we now recommend pluggable transports; for forward-
  3052. secrecy in TLS, we now use the P-256 group. Closes ticket 13736.
  3053. - Remove the HidServDirectoryV2 option. Now all relays offer to
  3054. store hidden service descriptors. Related to 16543.
  3055. - Remove the VoteOnHidServDirectoriesV2 option, since all
  3056. authorities have long set it to 1. Closes ticket 16543.
  3057. - Remove the undocumented "--digests" command-line option. It
  3058. complicated our build process, caused subtle build issues on
  3059. multiple platforms, and is now redundant since we started
  3060. including git version identifiers. Closes ticket 14742.
  3061. - Tor no longer contains checks for ancient directory cache versions
  3062. that didn't know about microdescriptors.
  3063. - Tor no longer contains workarounds for stat files generated by
  3064. super-old versions of Tor that didn't choose guards sensibly.
  3065. o Testing:
  3066. - The test-network.sh script now supports performance testing.
  3067. Requires corresponding chutney performance testing changes. Patch
  3068. by "teor". Closes ticket 14175.
  3069. - Add a new set of callgraph analysis scripts that use clang to
  3070. produce a list of which Tor functions are reachable from which
  3071. other Tor functions. We're planning to use these to help simplify
  3072. our code structure by identifying illogical dependencies.
  3073. - Add new 'test-full' and 'test-full-online' targets to run all
  3074. tests, including integration tests with stem and chutney.
  3075. - Autodetect CHUTNEY_PATH if the chutney and Tor sources are side-
  3076. by-side in the same parent directory. Closes ticket 16903. Patch
  3077. by "teor".
  3078. - Document use of coverity, clang static analyzer, and clang dynamic
  3079. undefined behavior and address sanitizers in doc/HACKING. Include
  3080. detailed usage instructions in the blacklist. Patch by "teor".
  3081. Closes ticket 15817.
  3082. - Make "bridges+hs" the default test network. This tests almost all
  3083. tor functionality during make test-network, while allowing tests
  3084. to succeed on non-IPv6 systems. Requires chutney commit 396da92 in
  3085. test-network-bridges-hs. Closes tickets 16945 (tor) and 16946
  3086. (chutney). Patches by "teor".
  3087. - Make the test-workqueue test work on Windows by initializing the
  3088. network before we begin.
  3089. - New make target (make test-network-all) to run multiple applicable
  3090. chutney test cases. Patch from Teor; closes 16953.
  3091. - Now that OpenSSL has its own scrypt implementation, add an unit
  3092. test that checks for interoperability between libscrypt_scrypt()
  3093. and OpenSSL's EVP_PBE_scrypt() so that we could not use libscrypt
  3094. and rely on EVP_PBE_scrypt() whenever possible. Resolves
  3095. ticket 16189.
  3096. - The link authentication protocol code now has extensive tests.
  3097. - The relay descriptor signature testing code now has
  3098. extensive tests.
  3099. - The test_workqueue program now runs faster, and is enabled by
  3100. default as a part of "make check".
  3101. - Unit test dns_resolve(), dns_clip_ttl() and dns_get_expiry_ttl()
  3102. functions in dns.c. Implements a portion of ticket 16831.
  3103. - Use environment variables rather than autoconf substitutions to
  3104. send variables from the build system to the test scripts. This
  3105. change should be easier to maintain, and cause 'make distcheck' to
  3106. work better than before. Fixes bug 17148.
  3107. - When building Tor with testing coverage enabled, run Chutney tests
  3108. (if any) using the 'tor-cov' coverage binary.
  3109. - When running test-network or test-stem, check for the absence of
  3110. stem/chutney before doing any build operations.
  3111. - Add a test to verify that the compiler does not eliminate our
  3112. memwipe() implementation. Closes ticket 15377.
  3113. - Add make rule `check-changes` to verify the format of changes
  3114. files. Closes ticket 15180.
  3115. - Add unit tests for control_event_is_interesting(). Add a compile-
  3116. time check that the number of events doesn't exceed the capacity
  3117. of control_event_t.event_mask. Closes ticket 15431, checks for
  3118. bugs similar to 13085. Patch by "teor".
  3119. - Command-line argument tests moved to Stem. Resolves ticket 14806.
  3120. - Integrate the ntor, backtrace, and zero-length keys tests into the
  3121. automake test suite. Closes ticket 15344.
  3122. - Remove assertions during builds to determine Tor's test coverage.
  3123. We don't want to trigger these even in assertions, so including
  3124. them artificially makes our branch coverage look worse than it is.
  3125. This patch provides the new test-stem-full and coverage-html-full
  3126. configure options. Implements ticket 15400.
  3127. - New TestingDirAuthVote{Exit,Guard,HSDir}IsStrict flags to
  3128. explicitly manage consensus flags in testing networks. Patch by
  3129. "robgjansen", modified by "teor". Implements part of ticket 14882.
  3130. - Check for matching value in server response in ntor_ref.py. Fixes
  3131. bug 15591; bugfix on 0.2.4.8-alpha. Reported and fixed
  3132. by "joelanders".
  3133. - Set the severity correctly when testing
  3134. get_interface_addresses_ifaddrs() and
  3135. get_interface_addresses_win32(), so that the tests fail gracefully
  3136. instead of triggering an assertion. Fixes bug 15759; bugfix on
  3137. 0.2.6.3-alpha. Reported by Nicolas Derive.
  3138. Changes in version 0.2.6.10 - 2015-07-12
  3139. Tor version 0.2.6.10 fixes some significant stability and hidden
  3140. service client bugs, bulletproofs the cryptography init process, and
  3141. fixes a bug when using the sandbox code with some older versions of
  3142. Linux. Everyone running an older version, especially an older version
  3143. of 0.2.6, should upgrade.
  3144. o Major bugfixes (hidden service clients, stability):
  3145. - Stop refusing to store updated hidden service descriptors on a
  3146. client. This reverts commit 9407040c59218 (which indeed fixed bug
  3147. 14219, but introduced a major hidden service reachability
  3148. regression detailed in bug 16381). This is a temporary fix since
  3149. we can live with the minor issue in bug 14219 (it just results in
  3150. some load on the network) but the regression of 16381 is too much
  3151. of a setback. First-round fix for bug 16381; bugfix
  3152. on 0.2.6.3-alpha.
  3153. o Major bugfixes (stability):
  3154. - Stop crashing with an assertion failure when parsing certain kinds
  3155. of malformed or truncated microdescriptors. Fixes bug 16400;
  3156. bugfix on 0.2.6.1-alpha. Found by "torkeln"; fix based on a patch
  3157. by "cypherpunks_backup".
  3158. - Stop random client-side assertion failures that could occur when
  3159. connecting to a busy hidden service, or connecting to a hidden
  3160. service while a NEWNYM is in progress. Fixes bug 16013; bugfix
  3161. on 0.1.0.1-rc.
  3162. o Minor features (geoip):
  3163. - Update geoip to the June 3 2015 Maxmind GeoLite2 Country database.
  3164. - Update geoip6 to the June 3 2015 Maxmind GeoLite2 Country database.
  3165. o Minor bugfixes (crypto error-handling):
  3166. - Check for failures from crypto_early_init, and refuse to continue.
  3167. A previous typo meant that we could keep going with an
  3168. uninitialized crypto library, and would have OpenSSL initialize
  3169. its own PRNG. Fixes bug 16360; bugfix on 0.2.5.2-alpha, introduced
  3170. when implementing ticket 4900. Patch by "teor".
  3171. o Minor bugfixes (Linux seccomp2 sandbox):
  3172. - Allow pipe() and pipe2() syscalls in the seccomp2 sandbox: we need
  3173. these when eventfd2() support is missing. Fixes bug 16363; bugfix
  3174. on 0.2.6.3-alpha. Patch from "teor".
  3175. Changes in version 0.2.6.9 - 2015-06-11
  3176. Tor 0.2.6.9 fixes a regression in the circuit isolation code, increases the
  3177. requirements for receiving an HSDir flag, and addresses some other small
  3178. bugs in the systemd and sandbox code. Clients using circuit isolation
  3179. should upgrade; all directory authorities should upgrade.
  3180. o Major bugfixes (client-side privacy):
  3181. - Properly separate out each SOCKSPort when applying stream
  3182. isolation. The error occurred because each port's session group was
  3183. being overwritten by a default value when the listener connection
  3184. was initialized. Fixes bug 16247; bugfix on 0.2.6.3-alpha. Patch
  3185. by "jojelino".
  3186. o Minor feature (directory authorities, security):
  3187. - The HSDir flag given by authorities now requires the Stable flag.
  3188. For the current network, this results in going from 2887 to 2806
  3189. HSDirs. Also, it makes it harder for an attacker to launch a sybil
  3190. attack by raising the effort for a relay to become Stable which
  3191. takes at the very least 7 days to do so and by keeping the 96
  3192. hours uptime requirement for HSDir. Implements ticket 8243.
  3193. o Minor bugfixes (compilation):
  3194. - Build with --enable-systemd correctly when libsystemd is
  3195. installed, but systemd is not. Fixes bug 16164; bugfix on
  3196. 0.2.6.3-alpha. Patch from Peter Palfrader.
  3197. o Minor bugfixes (Linux seccomp2 sandbox):
  3198. - Fix sandboxing to work when running as a relaymby renaming of
  3199. secret_id_key, and allowing the eventfd2 and futex syscalls. Fixes
  3200. bug 16244; bugfix on 0.2.6.1-alpha. Patch by Peter Palfrader.
  3201. - Allow systemd connections to work with the Linux seccomp2 sandbox
  3202. code. Fixes bug 16212; bugfix on 0.2.6.2-alpha. Patch by
  3203. Peter Palfrader.
  3204. o Minor bugfixes (tests):
  3205. - Fix a crash in the unit tests when built with MSVC2013. Fixes bug
  3206. 16030; bugfix on 0.2.6.2-alpha. Patch from "NewEraCracker".
  3207. Changes in version 0.2.6.8 - 2015-05-21
  3208. Tor 0.2.6.8 fixes a bit of dodgy code in parsing INTRODUCE2 cells, and
  3209. fixes an authority-side bug in assigning the HSDir flag. All directory
  3210. authorities should upgrade.
  3211. o Major bugfixes (hidden services, backport from 0.2.7.1-alpha):
  3212. - Revert commit that made directory authorities assign the HSDir
  3213. flag to relay without a DirPort; this was bad because such relays
  3214. can't handle BEGIN_DIR cells. Fixes bug 15850; bugfix
  3215. on 0.2.6.3-alpha.
  3216. o Minor bugfixes (hidden service, backport from 0.2.7.1-alpha):
  3217. - Fix an out-of-bounds read when parsing invalid INTRODUCE2 cells on
  3218. a client authorized hidden service. Fixes bug 15823; bugfix
  3219. on 0.2.1.6-alpha.
  3220. o Minor features (geoip):
  3221. - Update geoip to the April 8 2015 Maxmind GeoLite2 Country database.
  3222. - Update geoip6 to the April 8 2015 Maxmind GeoLite2
  3223. Country database.
  3224. Changes in version 0.2.6.7 - 2015-04-06
  3225. Tor 0.2.6.7 fixes two security issues that could be used by an
  3226. attacker to crash hidden services, or crash clients visiting hidden
  3227. services. Hidden services should upgrade as soon as possible; clients
  3228. should upgrade whenever packages become available.
  3229. This release also contains two simple improvements to make hidden
  3230. services a bit less vulnerable to denial-of-service attacks.
  3231. o Major bugfixes (security, hidden service):
  3232. - Fix an issue that would allow a malicious client to trigger an
  3233. assertion failure and halt a hidden service. Fixes bug 15600;
  3234. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  3235. - Fix a bug that could cause a client to crash with an assertion
  3236. failure when parsing a malformed hidden service descriptor. Fixes
  3237. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  3238. o Minor features (DoS-resistance, hidden service):
  3239. - Introduction points no longer allow multiple INTRODUCE1 cells to
  3240. arrive on the same circuit. This should make it more expensive for
  3241. attackers to overwhelm hidden services with introductions.
  3242. Resolves ticket 15515.
  3243. - Decrease the amount of reattempts that a hidden service performs
  3244. when its rendezvous circuits fail. This reduces the computational
  3245. cost for running a hidden service under heavy load. Resolves
  3246. ticket 11447.
  3247. Changes in version 0.2.5.12 - 2015-04-06
  3248. Tor 0.2.5.12 backports two fixes from 0.2.6.7 for security issues that
  3249. could be used by an attacker to crash hidden services, or crash clients
  3250. visiting hidden services. Hidden services should upgrade as soon as
  3251. possible; clients should upgrade whenever packages become available.
  3252. This release also backports a simple improvement to make hidden
  3253. services a bit less vulnerable to denial-of-service attacks.
  3254. o Major bugfixes (security, hidden service):
  3255. - Fix an issue that would allow a malicious client to trigger an
  3256. assertion failure and halt a hidden service. Fixes bug 15600;
  3257. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  3258. - Fix a bug that could cause a client to crash with an assertion
  3259. failure when parsing a malformed hidden service descriptor. Fixes
  3260. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  3261. o Minor features (DoS-resistance, hidden service):
  3262. - Introduction points no longer allow multiple INTRODUCE1 cells to
  3263. arrive on the same circuit. This should make it more expensive for
  3264. attackers to overwhelm hidden services with introductions.
  3265. Resolves ticket 15515.
  3266. Changes in version 0.2.4.27 - 2015-04-06
  3267. Tor 0.2.4.27 backports two fixes from 0.2.6.7 for security issues that
  3268. could be used by an attacker to crash hidden services, or crash clients
  3269. visiting hidden services. Hidden services should upgrade as soon as
  3270. possible; clients should upgrade whenever packages become available.
  3271. This release also backports a simple improvement to make hidden
  3272. services a bit less vulnerable to denial-of-service attacks.
  3273. o Major bugfixes (security, hidden service):
  3274. - Fix an issue that would allow a malicious client to trigger an
  3275. assertion failure and halt a hidden service. Fixes bug 15600;
  3276. bugfix on 0.2.1.6-alpha. Reported by "disgleirio".
  3277. - Fix a bug that could cause a client to crash with an assertion
  3278. failure when parsing a malformed hidden service descriptor. Fixes
  3279. bug 15601; bugfix on 0.2.1.5-alpha. Found by "DonnchaC".
  3280. o Minor features (DoS-resistance, hidden service):
  3281. - Introduction points no longer allow multiple INTRODUCE1 cells to
  3282. arrive on the same circuit. This should make it more expensive for
  3283. attackers to overwhelm hidden services with introductions.
  3284. Resolves ticket 15515.
  3285. Changes in version 0.2.6.6 - 2015-03-24
  3286. Tor 0.2.6.6 is the first stable release in the 0.2.6 series.
  3287. It adds numerous safety, security, correctness, and performance
  3288. improvements. Client programs can be configured to use more kinds of
  3289. sockets, AutomapHosts works better, the multithreading backend is
  3290. improved, cell transmission is refactored, test coverage is much
  3291. higher, more denial-of-service attacks are handled, guard selection is
  3292. improved to handle long-term guards better, pluggable transports
  3293. should work a bit better, and some annoying hidden service performance
  3294. bugs should be addressed.
  3295. o New compiler and system requirements:
  3296. - Tor 0.2.6.x requires that your compiler support more of the C99
  3297. language standard than before. The 'configure' script now detects
  3298. whether your compiler supports C99 mid-block declarations and
  3299. designated initializers. If it does not, Tor will not compile.
  3300. We may revisit this requirement if it turns out that a significant
  3301. number of people need to build Tor with compilers that don't
  3302. bother implementing a 15-year-old standard. Closes ticket 13233.
  3303. - Tor no longer supports systems without threading support. When we
  3304. began working on Tor, there were several systems that didn't have
  3305. threads, or where the thread support wasn't able to run the
  3306. threads of a single process on multiple CPUs. That no longer
  3307. holds: every system where Tor needs to run well now has threading
  3308. support. Resolves ticket 12439.
  3309. o Deprecated versions and removed support:
  3310. - Tor relays older than 0.2.4.18-rc are no longer allowed to
  3311. advertise themselves on the network. Closes ticket 13555.
  3312. - Tor clients no longer support connecting to hidden services
  3313. running on Tor 0.2.2.x and earlier; the Support022HiddenServices
  3314. option has been removed. (There shouldn't be any hidden services
  3315. running these versions on the network.) Closes ticket 7803.
  3316. o Directory authority changes:
  3317. - The directory authority Faravahar has a new IP address. This
  3318. closes ticket 14487.
  3319. - Remove turtles as a directory authority.
  3320. - Add longclaw as a new (v3) directory authority. This implements
  3321. ticket 13296. This keeps the directory authority count at 9.
  3322. o Major features (bridges):
  3323. - Expose the outgoing upstream HTTP/SOCKS proxy to pluggable
  3324. transports if they are configured via the "TOR_PT_PROXY"
  3325. environment variable. Implements proposal 232. Resolves
  3326. ticket 8402.
  3327. o Major features (changed defaults):
  3328. - Prevent relay operators from unintentionally running exits: When a
  3329. relay is configured as an exit node, we now warn the user unless
  3330. the "ExitRelay" option is set to 1. We warn even more loudly if
  3331. the relay is configured with the default exit policy, since this
  3332. can indicate accidental misconfiguration. Setting "ExitRelay 0"
  3333. stops Tor from running as an exit relay. Closes ticket 10067.
  3334. o Major features (client performance, hidden services):
  3335. - Allow clients to use optimistic data when connecting to a hidden
  3336. service, which should remove a round-trip from hidden service
  3337. initialization. See proposal 181 for details. Implements
  3338. ticket 13211.
  3339. o Major features (directory system):
  3340. - Upon receiving an unparseable directory object, if its digest
  3341. matches what we expected, then don't try to download it again.
  3342. Previously, when we got a descriptor we didn't like, we would keep
  3343. trying to download it over and over. Closes ticket 11243.
  3344. - When downloading server- or microdescriptors from a directory
  3345. server, we no longer launch multiple simultaneous requests to the
  3346. same server. This reduces load on the directory servers,
  3347. especially when directory guards are in use. Closes ticket 9969.
  3348. - When downloading server- or microdescriptors over a tunneled
  3349. connection, do not limit the length of our requests to what the
  3350. Squid proxy is willing to handle. Part of ticket 9969.
  3351. - Authorities can now vote on the correct digests and latest
  3352. versions for different software packages. This allows packages
  3353. that include Tor to use the Tor authority system as a way to get
  3354. notified of updates and their correct digests. Implements proposal
  3355. 227. Closes ticket 10395.
  3356. o Major features (guards):
  3357. - Introduce the Guardfraction feature to improves load balancing on
  3358. guard nodes. Specifically, it aims to reduce the traffic gap that
  3359. guard nodes experience when they first get the Guard flag. This is
  3360. a required step if we want to increase the guard lifetime to 9
  3361. months or greater. Closes ticket 9321.
  3362. o Major features (hidden services):
  3363. - Make HS port scanning more difficult by immediately closing the
  3364. circuit when a user attempts to connect to a nonexistent port.
  3365. Closes ticket 13667.
  3366. - Add a HiddenServiceStatistics option that allows Tor relays to
  3367. gather and publish statistics about the overall size and volume of
  3368. hidden service usage. Specifically, when this option is turned on,
  3369. an HSDir will publish an approximate number of hidden services
  3370. that have published descriptors to it the past 24 hours. Also, if
  3371. a relay has acted as a hidden service rendezvous point, it will
  3372. publish the approximate amount of rendezvous cells it has relayed
  3373. the past 24 hours. The statistics themselves are obfuscated so
  3374. that the exact values cannot be derived. For more details see
  3375. proposal 238, "Better hidden service stats from Tor relays". This
  3376. feature is currently disabled by default. Implements feature 13192.
  3377. o Major features (performance):
  3378. - Make the CPU worker implementation more efficient by avoiding the
  3379. kernel and lengthening pipelines. The original implementation used
  3380. sockets to transfer data from the main thread to the workers, and
  3381. didn't allow any thread to be assigned more than a single piece of
  3382. work at once. The new implementation avoids communications
  3383. overhead by making requests in shared memory, avoiding kernel IO
  3384. where possible, and keeping more requests in flight at once.
  3385. Implements ticket 9682.
  3386. o Major features (relay):
  3387. - Raise the minimum acceptable configured bandwidth rate for bridges
  3388. to 50 KiB/sec and for relays to 75 KiB/sec. (The old values were
  3389. 20 KiB/sec.) Closes ticket 13822.
  3390. - Complete revision of the code that relays use to decide which cell
  3391. to send next. Formerly, we selected the best circuit to write on
  3392. each channel, but we didn't select among channels in any
  3393. sophisticated way. Now, we choose the best circuits globally from
  3394. among those whose channels are ready to deliver traffic.
  3395. This patch implements a new inter-cmux comparison API, a global
  3396. high/low watermark mechanism and a global scheduler loop for
  3397. transmission prioritization across all channels as well as among
  3398. circuits on one channel. This schedule is currently tuned to
  3399. (tolerantly) avoid making changes in network performance, but it
  3400. should form the basis for major circuit performance increases in
  3401. the future. Code by Andrea; tuning by Rob Jansen; implements
  3402. ticket 9262.
  3403. o Major features (sample torrc):
  3404. - Add a new, infrequently-changed "torrc.minimal". This file is
  3405. similar to torrc.sample, but it will change as infrequently as
  3406. possible, for the benefit of users whose systems prompt them for
  3407. intervention whenever a default configuration file is changed.
  3408. Making this change allows us to update torrc.sample to be a more
  3409. generally useful "sample torrc".
  3410. o Major features (security, unix domain sockets):
  3411. - Allow SocksPort to be an AF_UNIX Unix Domain Socket. Now high risk
  3412. applications can reach Tor without having to create AF_INET or
  3413. AF_INET6 sockets, meaning they can completely disable their
  3414. ability to make non-Tor network connections. To create a socket of
  3415. this type, use "SocksPort unix:/path/to/socket". Implements
  3416. ticket 12585.
  3417. - Support mapping hidden service virtual ports to AF_UNIX sockets.
  3418. The syntax is "HiddenServicePort 80 unix:/path/to/socket".
  3419. Implements ticket 11485.
  3420. o Major bugfixes (client, automap):
  3421. - Repair automapping with IPv6 addresses. This automapping should
  3422. have worked previously, but one piece of debugging code that we
  3423. inserted to detect a regression actually caused the regression to
  3424. manifest itself again. Fixes bug 13811 and bug 12831; bugfix on
  3425. 0.2.4.7-alpha. Diagnosed and fixed by Francisco Blas
  3426. Izquierdo Riera.
  3427. o Major bugfixes (crash, OSX, security):
  3428. - Fix a remote denial-of-service opportunity caused by a bug in
  3429. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  3430. in OSX 10.9.
  3431. o Major bugfixes (directory authorities):
  3432. - Do not assign the HSDir flag to relays if they are not Valid, or
  3433. currently hibernating. Fixes 12573; bugfix on 0.2.0.10-alpha.
  3434. o Major bugfixes (directory bandwidth performance):
  3435. - Don't flush the zlib buffer aggressively when compressing
  3436. directory information for clients. This should save about 7% of
  3437. the bandwidth currently used for compressed descriptors and
  3438. microdescriptors. Fixes bug 11787; bugfix on 0.1.1.23.
  3439. o Major bugfixes (exit node stability):
  3440. - Fix an assertion failure that could occur under high DNS load.
  3441. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  3442. diagnosed and fixed by "cypherpunks".
  3443. o Major bugfixes (FreeBSD IPFW transparent proxy):
  3444. - Fix address detection with FreeBSD transparent proxies, when
  3445. "TransProxyType ipfw" is in use. Fixes bug 15064; bugfix
  3446. on 0.2.5.4-alpha.
  3447. o Major bugfixes (hidden services):
  3448. - When closing an introduction circuit that was opened in parallel
  3449. with others, don't mark the introduction point as unreachable.
  3450. Previously, the first successful connection to an introduction
  3451. point would make the other introduction points get marked as
  3452. having timed out. Fixes bug 13698; bugfix on 0.0.6rc2.
  3453. o Major bugfixes (Linux seccomp2 sandbox):
  3454. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  3455. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  3456. 0.2.5.1-alpha. Patch from "sanic".
  3457. o Major bugfixes (mixed relay-client operation):
  3458. - When running as a relay and client at the same time (not
  3459. recommended), if we decide not to use a new guard because we want
  3460. to retry older guards, only close the locally-originating circuits
  3461. passing through that guard. Previously we would close all the
  3462. circuits through that guard. Fixes bug 9819; bugfix on
  3463. 0.2.1.1-alpha. Reported by "skruffy".
  3464. o Major bugfixes (pluggable transports):
  3465. - Initialize the extended OR Port authentication cookie before
  3466. launching pluggable transports. This prevents a race condition
  3467. that occured when server-side pluggable transports would cache the
  3468. authentication cookie before it has been (re)generated. Fixes bug
  3469. 15240; bugfix on 0.2.5.1-alpha.
  3470. o Major bugfixes (relay, stability, possible security):
  3471. - Fix a bug that could lead to a relay crashing with an assertion
  3472. failure if a buffer of exactly the wrong layout is passed to
  3473. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  3474. 0.2.0.10-alpha. Patch from "cypherpunks".
  3475. - Do not assert if the 'data' pointer on a buffer is advanced to the
  3476. very end of the buffer; log a BUG message instead. Only assert if
  3477. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  3478. o Minor features (build):
  3479. - New --disable-system-torrc compile-time option to prevent Tor from
  3480. looking for the system-wide torrc or torrc-defaults files.
  3481. Resolves ticket 13037.
  3482. o Minor features (client):
  3483. - Clients are now willing to send optimistic data (before they
  3484. receive a 'connected' cell) to relays of any version. (Relays
  3485. without support for optimistic data are no longer supported on the
  3486. Tor network.) Resolves ticket 13153.
  3487. o Minor features (client):
  3488. - Validate hostnames in SOCKS5 requests more strictly. If SafeSocks
  3489. is enabled, reject requests with IP addresses as hostnames.
  3490. Resolves ticket 13315.
  3491. o Minor features (controller):
  3492. - Add a "SIGNAL HEARTBEAT" controller command that tells Tor to
  3493. write an unscheduled heartbeat message to the log. Implements
  3494. feature 9503.
  3495. - Include SOCKS_USERNAME and SOCKS_PASSWORD values in controller
  3496. events so controllers can observe circuit isolation inputs. Closes
  3497. ticket 8405.
  3498. - ControlPort now supports the unix:/path/to/socket syntax as an
  3499. alternative to the ControlSocket option, for consistency with
  3500. SocksPort and HiddenServicePort. Closes ticket 14451.
  3501. - New "GETINFO bw-event-cache" to get information about recent
  3502. bandwidth events. Closes ticket 14128. Useful for controllers to
  3503. get recent bandwidth history after the fix for ticket 13988.
  3504. - Messages about problems in the bootstrap process now include
  3505. information about the server we were trying to connect to when we
  3506. noticed the problem. Closes ticket 15006.
  3507. o Minor features (Denial of service resistance):
  3508. - Count the total number of bytes used storing hidden service
  3509. descriptors against the value of MaxMemInQueues. If we're low on
  3510. memory, and more than 20% of our memory is used holding hidden
  3511. service descriptors, free them until no more than 10% of our
  3512. memory holds hidden service descriptors. Free the least recently
  3513. fetched descriptors first. Resolves ticket 13806.
  3514. - When we have recently been under memory pressure (over 3/4 of
  3515. MaxMemInQueues is allocated), then allocate smaller zlib objects
  3516. for small requests. Closes ticket 11791.
  3517. o Minor features (directory authorities):
  3518. - Don't list relays with a bandwidth estimate of 0 in the consensus.
  3519. Implements a feature proposed during discussion of bug 13000.
  3520. - In tor-gencert, report an error if the user provides the same
  3521. argument more than once.
  3522. - If a directory authority can't find a best consensus method in the
  3523. votes that it holds, it now falls back to its favorite consensus
  3524. method. Previously, it fell back to method 1. Neither of these is
  3525. likely to get enough signatures, but "fall back to favorite"
  3526. doesn't require us to maintain support an obsolete consensus
  3527. method. Implements part of proposal 215.
  3528. o Minor features (geoip):
  3529. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  3530. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  3531. Country database.
  3532. o Minor features (guard nodes):
  3533. - Reduce the time delay before saving guard status to disk from 10
  3534. minutes to 30 seconds (or from one hour to 10 minutes if
  3535. AvoidDiskWrites is set). Closes ticket 12485.
  3536. o Minor features (heartbeat):
  3537. - On relays, report how many connections we negotiated using each
  3538. version of the Tor link protocols. This information will let us
  3539. know if removing support for very old versions of the Tor
  3540. protocols is harming the network. Closes ticket 15212.
  3541. o Minor features (hidden service):
  3542. - Make Sybil attacks against hidden services harder by changing the
  3543. minimum time required to get the HSDir flag from 25 hours up to 96
  3544. hours. Addresses ticket 14149.
  3545. - New option "HiddenServiceAllowUnknownPorts" to allow hidden
  3546. services to disable the anti-scanning feature introduced in
  3547. 0.2.6.2-alpha. With this option not set, a connection to an
  3548. unlisted port closes the circuit. With this option set, only a
  3549. RELAY_DONE cell is sent. Closes ticket 14084.
  3550. - When re-enabling the network, don't try to build introduction
  3551. circuits until we have successfully built a circuit. This makes
  3552. hidden services come up faster when the network is re-enabled.
  3553. Patch from "akwizgran". Closes ticket 13447.
  3554. - When we fail to retrieve a hidden service descriptor, send the
  3555. controller an "HS_DESC FAILED" controller event. Implements
  3556. feature 13212.
  3557. - New HiddenServiceDirGroupReadable option to cause hidden service
  3558. directories and hostname files to be created group-readable. Patch
  3559. from "anon", David Stainton, and "meejah". Closes ticket 11291.
  3560. o Minor features (interface):
  3561. - Implement "-f -" command-line option to read torrc configuration
  3562. from standard input, if you don't want to store the torrc file in
  3563. the file system. Implements feature 13865.
  3564. o Minor features (logging):
  3565. - Add a count of unique clients to the bridge heartbeat message.
  3566. Resolves ticket 6852.
  3567. - Suppress "router info incompatible with extra info" message when
  3568. reading extrainfo documents from cache. (This message got loud
  3569. around when we closed bug 9812 in 0.2.6.2-alpha.) Closes
  3570. ticket 13762.
  3571. - Elevate hidden service authorized-client message from DEBUG to
  3572. INFO. Closes ticket 14015.
  3573. - On Unix-like systems, you can now use named pipes as the target of
  3574. the Log option, and other options that try to append to files.
  3575. Closes ticket 12061. Patch from "carlo von lynX".
  3576. - When opening a log file at startup, send it every log message that
  3577. we generated between startup and opening it. Previously, log
  3578. messages that were generated before opening the log file were only
  3579. logged to stdout. Closes ticket 6938.
  3580. - Add a TruncateLogFile option to overwrite logs instead of
  3581. appending to them. Closes ticket 5583.
  3582. - Quiet some log messages in the heartbeat and at startup. Closes
  3583. ticket 14950.
  3584. o Minor features (portability, Solaris):
  3585. - Threads are no longer disabled by default on Solaris; we believe
  3586. that the versions of Solaris with broken threading support are all
  3587. obsolete by now. Resolves ticket 9495.
  3588. o Minor features (relay):
  3589. - Re-check our address after we detect a changed IP address from
  3590. getsockname(). This ensures that the controller command "GETINFO
  3591. address" will report the correct value. Resolves ticket 11582.
  3592. Patch from "ra".
  3593. - A new AccountingRule option lets Relays set whether they'd like
  3594. AccountingMax to be applied separately to inbound and outbound
  3595. traffic, or applied to the sum of inbound and outbound traffic.
  3596. Resolves ticket 961. Patch by "chobe".
  3597. - When identity keypair is generated for first time, log a
  3598. congratulatory message that links to the new relay lifecycle
  3599. document. Implements feature 10427.
  3600. o Minor features (security, memory wiping):
  3601. - Ensure we securely wipe keys from memory after
  3602. crypto_digest_get_digest and init_curve25519_keypair_from_file
  3603. have finished using them. Resolves ticket 13477.
  3604. o Minor features (security, out-of-memory handling):
  3605. - When handling an out-of-memory condition, allocate less memory for
  3606. temporary data structures. Fixes issue 10115.
  3607. - When handling an out-of-memory condition, consider more types of
  3608. buffers, including those on directory connections, and zlib
  3609. buffers. Resolves ticket 11792.
  3610. o Minor features (stability):
  3611. - Add assertions in our hash-table iteration code to check for
  3612. corrupted values that could cause infinite loops. Closes
  3613. ticket 11737.
  3614. o Minor features (systemd):
  3615. - Various improvements and modernizations in systemd hardening
  3616. support. Closes ticket 13805. Patch from Craig Andrews.
  3617. - Where supported, when running with systemd, report successful
  3618. startup to systemd. Part of ticket 11016. Patch by Michael Scherer.
  3619. - When running with systemd, support systemd watchdog messages. Part
  3620. of ticket 11016. Patch by Michael Scherer.
  3621. o Minor features (testing networks):
  3622. - Add the TestingDirAuthVoteExit option, which lists nodes to assign
  3623. the "Exit" flag regardless of their uptime, bandwidth, or exit
  3624. policy. TestingTorNetwork must be set for this option to have any
  3625. effect. Previously, authorities would take up to 35 minutes to
  3626. give nodes the Exit flag in a test network. Partially implements
  3627. ticket 13161.
  3628. - Drop the minimum RendPostPeriod on a testing network to 5 seconds,
  3629. and the default on a testing network to 2 minutes. Drop the
  3630. MIN_REND_INITIAL_POST_DELAY on a testing network to 5 seconds, but
  3631. keep the default on a testing network at 30 seconds. This reduces
  3632. HS bootstrap time to around 25 seconds. Also, change the default
  3633. time in test-network.sh to match. Closes ticket 13401. Patch
  3634. by "teor".
  3635. - Create TestingDirAuthVoteHSDir to correspond to
  3636. TestingDirAuthVoteExit/Guard. Ensures that authorities vote the
  3637. HSDir flag for the listed relays regardless of uptime or ORPort
  3638. connectivity. Respects the value of VoteOnHidServDirectoriesV2.
  3639. Partial implementation for ticket 14067. Patch by "teor".
  3640. o Minor features (tor2web mode):
  3641. - Introduce the config option Tor2webRendezvousPoints, which allows
  3642. clients in Tor2webMode to select a specific Rendezvous Point to be
  3643. used in HS circuits. This might allow better performance for
  3644. Tor2Web nodes. Implements ticket 12844.
  3645. o Minor features (transparent proxy):
  3646. - Update the transparent proxy option checks to allow for both ipfw
  3647. and pf on OS X. Closes ticket 14002.
  3648. - Use the correct option when using IPv6 with transparent proxy
  3649. support on Linux. Resolves 13808. Patch by Francisco Blas
  3650. Izquierdo Riera.
  3651. o Minor features (validation):
  3652. - Check all date/time values passed to tor_timegm and
  3653. parse_rfc1123_time for validity, taking leap years into account.
  3654. Improves HTTP header validation. Implemented with bug 13476.
  3655. - In correct_tm(), limit the range of values returned by system
  3656. localtime(_r) and gmtime(_r) to be between the years 1 and 8099.
  3657. This means we don't have to deal with negative or too large dates,
  3658. even if a clock is wrong. Otherwise we might fail to read a file
  3659. written by us which includes such a date. Fixes bug 13476.
  3660. - Stop allowing invalid address patterns like "*/24" that contain
  3661. both a wildcard address and a bit prefix length. This affects all
  3662. our address-range parsing code. Fixes bug 7484; bugfix
  3663. on 0.0.2pre14.
  3664. o Minor bugfixes (bridge clients):
  3665. - When configured to use a bridge without an identity digest (not
  3666. recommended), avoid launching an extra channel to it when
  3667. bootstrapping. Fixes bug 7733; bugfix on 0.2.4.4-alpha.
  3668. o Minor bugfixes (bridges):
  3669. - When DisableNetwork is set, do not launch pluggable transport
  3670. plugins, and if any are running, terminate them. Fixes bug 13213;
  3671. bugfix on 0.2.3.6-alpha.
  3672. o Minor bugfixes (C correctness):
  3673. - Fix several instances of possible integer overflow/underflow/NaN.
  3674. Fixes bug 13104; bugfix on 0.2.3.1-alpha and later. Patches
  3675. from "teor".
  3676. - In circuit_build_times_calculate_timeout() in circuitstats.c,
  3677. avoid dividing by zero in the pareto calculations. This traps
  3678. under clang's "undefined-trap" sanitizer. Fixes bug 13290; bugfix
  3679. on 0.2.2.2-alpha.
  3680. - Fix an integer overflow in format_time_interval(). Fixes bug
  3681. 13393; bugfix on 0.2.0.10-alpha.
  3682. - Set the correct day of year value when the system's localtime(_r)
  3683. or gmtime(_r) functions fail to set struct tm. Not externally
  3684. visible. Fixes bug 13476; bugfix on 0.0.2pre14.
  3685. - Avoid unlikely signed integer overflow in tor_timegm on systems
  3686. with 32-bit time_t. Fixes bug 13476; bugfix on 0.0.2pre14.
  3687. o Minor bugfixes (certificate handling):
  3688. - If an authority operator accidentally makes a signing certificate
  3689. with a future publication time, do not discard its real signing
  3690. certificates. Fixes bug 11457; bugfix on 0.2.0.3-alpha.
  3691. - Remove any old authority certificates that have been superseded
  3692. for at least two days. Previously, we would keep superseded
  3693. certificates until they expired, if they were published close in
  3694. time to the certificate that superseded them. Fixes bug 11454;
  3695. bugfix on 0.2.1.8-alpha.
  3696. o Minor bugfixes (client):
  3697. - Fix smartlist_choose_node_by_bandwidth() so that relays with the
  3698. BadExit flag are not considered worthy candidates. Fixes bug
  3699. 13066; bugfix on 0.1.2.3-alpha.
  3700. - Use the consensus schedule for downloading consensuses, and not
  3701. the generic schedule. Fixes bug 11679; bugfix on 0.2.2.6-alpha.
  3702. - Handle unsupported or malformed SOCKS5 requests properly by
  3703. responding with the appropriate error message before closing the
  3704. connection. Fixes bugs 12971 and 13314; bugfix on 0.0.2pre13.
  3705. o Minor bugfixes (client, automapping):
  3706. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  3707. no value follows the option. Fixes bug 14142; bugfix on
  3708. 0.2.4.7-alpha. Patch by "teor".
  3709. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  3710. 14195; bugfix on 0.1.0.1-rc.
  3711. - Prevent changes to other options from removing the wildcard value
  3712. "." from "AutomapHostsSuffixes". Fixes bug 12509; bugfix
  3713. on 0.2.0.1-alpha.
  3714. - Allow MapAddress and AutomapHostsOnResolve to work together when
  3715. an address is mapped into another address type (like .onion) that
  3716. must be automapped at resolve time. Fixes bug 7555; bugfix
  3717. on 0.2.0.1-alpha.
  3718. o Minor bugfixes (client, bridges):
  3719. - When we are using bridges and we had a network connectivity
  3720. problem, only retry connecting to our currently configured
  3721. bridges, not all bridges we know about and remember using. Fixes
  3722. bug 14216; bugfix on 0.2.2.17-alpha.
  3723. o Minor bugfixes (client, DNS):
  3724. - Report the correct cached DNS expiration times on SOCKS port or in
  3725. DNS replies. Previously, we would report everything as "never
  3726. expires." Fixes bug 14193; bugfix on 0.2.3.17-beta.
  3727. - Avoid a small memory leak when we find a cached answer for a
  3728. reverse DNS lookup in a client-side DNS cache. (Remember, client-
  3729. side DNS caching is off by default, and is not recommended.) Fixes
  3730. bug 14259; bugfix on 0.2.0.1-alpha.
  3731. o Minor bugfixes (client, IPv6):
  3732. - Reject socks requests to literal IPv6 addresses when IPv6Traffic
  3733. flag is not set; and not because the NoIPv4Traffic flag was set.
  3734. Previously we'd looked at the NoIPv4Traffic flag for both types of
  3735. literal addresses. Fixes bug 14280; bugfix on 0.2.4.7-alpha.
  3736. o Minor bugfixes (client, microdescriptors):
  3737. - Use a full 256 bits of the SHA256 digest of a microdescriptor when
  3738. computing which microdescriptors to download. This keeps us from
  3739. erroneous download behavior if two microdescriptor digests ever
  3740. have the same first 160 bits. Fixes part of bug 13399; bugfix
  3741. on 0.2.3.1-alpha.
  3742. - Reset a router's status if its microdescriptor digest changes,
  3743. even if the first 160 bits remain the same. Fixes part of bug
  3744. 13399; bugfix on 0.2.3.1-alpha.
  3745. o Minor bugfixes (client, torrc):
  3746. - Stop modifying the value of our DirReqStatistics torrc option just
  3747. because we're not a bridge or relay. This bug was causing Tor
  3748. Browser users to write "DirReqStatistics 0" in their torrc files
  3749. as if they had chosen to change the config. Fixes bug 4244; bugfix
  3750. on 0.2.3.1-alpha.
  3751. - When GeoIPExcludeUnknown is enabled, do not incorrectly decide
  3752. that our options have changed every time we SIGHUP. Fixes bug
  3753. 9801; bugfix on 0.2.4.10-alpha. Patch from "qwerty1".
  3754. o Minor bugfixes (compilation):
  3755. - Fix a compilation warning on s390. Fixes bug 14988; bugfix
  3756. on 0.2.5.2-alpha.
  3757. - Silence clang warnings under --enable-expensive-hardening,
  3758. including implicit truncation of 64 bit values to 32 bit, const
  3759. char assignment to self, tautological compare, and additional
  3760. parentheses around equality tests. Fixes bug 13577; bugfix
  3761. on 0.2.5.4-alpha.
  3762. - Fix a clang warning about checking whether an address in the
  3763. middle of a structure is NULL. Fixes bug 14001; bugfix
  3764. on 0.2.1.2-alpha.
  3765. - The address of an array in the middle of a structure will always
  3766. be non-NULL. clang recognises this and complains. Disable the
  3767. tautologous and redundant check to silence this warning. Fixes bug
  3768. 14001; bugfix on 0.2.1.2-alpha.
  3769. - Compile correctly with (unreleased) OpenSSL 1.1.0 headers.
  3770. Addresses ticket 14188.
  3771. - Build without warnings with the stock OpenSSL srtp.h header, which
  3772. has a duplicate declaration of SSL_get_selected_srtp_profile().
  3773. Fixes bug 14220; this is OpenSSL's bug, not ours.
  3774. - Do not compile any code related to Tor2Web mode when Tor2Web mode
  3775. is not enabled at compile time. Previously, this code was included
  3776. in a disabled state. See discussion on ticket 12844.
  3777. - Allow our configure script to build correctly with autoconf 2.62
  3778. again. Fixes bug 12693; bugfix on 0.2.5.2-alpha.
  3779. - Improve the error message from ./configure to make it clear that
  3780. when asciidoc has not been found, the user will have to either add
  3781. --disable-asciidoc argument or install asciidoc. Resolves
  3782. ticket 13228.
  3783. o Minor bugfixes (controller):
  3784. - Report "down" in response to the "GETINFO entry-guards" command
  3785. when relays are down with an unreachable_since value. Previously,
  3786. we would report "up". Fixes bug 14184; bugfix on 0.1.2.2-alpha.
  3787. - Avoid crashing on a malformed EXTENDCIRCUIT command. Fixes bug
  3788. 14116; bugfix on 0.2.2.9-alpha.
  3789. o Minor bugfixes (controller):
  3790. - Return an error when the second or later arguments of the
  3791. "setevents" controller command are invalid events. Previously we
  3792. would return success while silently skipping invalid events. Fixes
  3793. bug 13205; bugfix on 0.2.3.2-alpha. Reported by "fpxnns".
  3794. o Minor bugfixes (directory authority):
  3795. - Allow directory authorities to fetch more data from one another if
  3796. they find themselves missing lots of votes. Previously, they had
  3797. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  3798. bugfix on 0.1.2.5-alpha.
  3799. - Do not attempt to download extrainfo documents which we will be
  3800. unable to validate with a matching server descriptor. Fixes bug
  3801. 13762; bugfix on 0.2.0.1-alpha.
  3802. - Fix a bug that was truncating AUTHDIR_NEWDESC events sent to the
  3803. control port. Fixes bug 14953; bugfix on 0.2.0.1-alpha.
  3804. - Enlarge the buffer to read bwauth generated files to avoid an
  3805. issue when parsing the file in dirserv_read_measured_bandwidths().
  3806. Fixes bug 14125; bugfix on 0.2.2.1-alpha.
  3807. - When running as a v3 directory authority, advertise that you serve
  3808. extra-info documents so that clients who want them can find them
  3809. from you too. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  3810. o Minor bugfixes (directory system):
  3811. - Always believe that v3 directory authorities serve extra-info
  3812. documents, whether they advertise "caches-extra-info" or not.
  3813. Fixes part of bug 11683; bugfix on 0.2.0.1-alpha.
  3814. - Check the BRIDGE_DIRINFO flag bitwise rather than using equality.
  3815. Previously, directories offering BRIDGE_DIRINFO and some other
  3816. flag (i.e. microdescriptors or extrainfo) would be ignored when
  3817. looking for bridges. Partially fixes bug 13163; bugfix
  3818. on 0.2.0.7-alpha.
  3819. o Minor bugfixes (file handling):
  3820. - Stop failing when key files are zero-length. Instead, generate new
  3821. keys, and overwrite the empty key files. Fixes bug 13111; bugfix
  3822. on all versions of Tor. Patch by "teor".
  3823. - Stop generating a fresh .old RSA onion key file when the .old file
  3824. is missing. Fixes part of 13111; bugfix on 0.0.6rc1.
  3825. - Avoid overwriting .old key files with empty key files.
  3826. - Skip loading zero-length extrainfo store, router store, stats,
  3827. state, and key files.
  3828. - Avoid crashing when trying to reload a torrc specified as a
  3829. relative path with RunAsDaemon turned on. Fixes bug 13397; bugfix
  3830. on 0.2.3.11-alpha.
  3831. o Minor bugfixes (hidden services):
  3832. - Close the introduction circuit when we have no more usable intro
  3833. points, instead of waiting for it to time out. This also ensures
  3834. that no follow-up HS descriptor fetch is triggered when the
  3835. circuit eventually times out. Fixes bug 14224; bugfix on 0.0.6.
  3836. - When fetching a hidden service descriptor for a down service that
  3837. was recently up, do not keep refetching until we try the same
  3838. replica twice in a row. Fixes bug 14219; bugfix on 0.2.0.10-alpha.
  3839. - Correctly send a controller event when we find that a rendezvous
  3840. circuit has finished. Fixes bug 13936; bugfix on 0.1.1.5-alpha.
  3841. - Pre-check directory permissions for new hidden-services to avoid
  3842. at least one case of "Bug: Acting on config options left us in a
  3843. broken state. Dying." Fixes bug 13942; bugfix on 0.0.6pre1.
  3844. - When fetching hidden service descriptors, we now check not only
  3845. for whether we got the hidden service we had in mind, but also
  3846. whether we got the particular descriptors we wanted. This prevents
  3847. a class of inefficient but annoying DoS attacks by hidden service
  3848. directories. Fixes bug 13214; bugfix on 0.2.1.6-alpha. Reported
  3849. by "special".
  3850. o Minor bugfixes (Linux seccomp2 sandbox):
  3851. - Make transparent proxy support work along with the seccomp2
  3852. sandbox. Fixes part of bug 13808; bugfix on 0.2.5.1-alpha. Patch
  3853. by Francisco Blas Izquierdo Riera.
  3854. - Fix a memory leak in tor-resolve when running with the sandbox
  3855. enabled. Fixes bug 14050; bugfix on 0.2.5.9-rc.
  3856. - Allow glibc fatal errors to be sent to stderr before Tor exits.
  3857. Previously, glibc would try to write them to /dev/tty, and the
  3858. sandbox would trap the call and make Tor exit prematurely. Fixes
  3859. bug 14759; bugfix on 0.2.5.1-alpha.
  3860. o Minor bugfixes (logging):
  3861. - Avoid crashing when there are more log domains than entries in
  3862. domain_list. Bugfix on 0.2.3.1-alpha.
  3863. - Downgrade warnings about RSA signature failures to info log level.
  3864. Emit a warning when an extra info document is found incompatible
  3865. with a corresponding router descriptor. Fixes bug 9812; bugfix
  3866. on 0.0.6rc3.
  3867. - Make connection_ap_handshake_attach_circuit() log the circuit ID
  3868. correctly. Fixes bug 13701; bugfix on 0.0.6.
  3869. o Minor bugfixes (networking):
  3870. - Check for orconns and use connection_or_close_for_error() rather
  3871. than connection_mark_for_close() directly in the getsockopt()
  3872. failure case of connection_handle_write_impl(). Fixes bug 11302;
  3873. bugfix on 0.2.4.4-alpha.
  3874. o Minor bugfixes (parsing):
  3875. - Stop accepting milliseconds (or other junk) at the end of
  3876. descriptor publication times. Fixes bug 9286; bugfix on 0.0.2pre25.
  3877. - Support two-number and three-number version numbers correctly, in
  3878. case we change the Tor versioning system in the future. Fixes bug
  3879. 13661; bugfix on 0.0.8pre1.
  3880. o Minor bugfixes (portability):
  3881. - Fix the ioctl()-based network interface lookup code so that it
  3882. will work on systems that have variable-length struct ifreq, for
  3883. example Mac OS X.
  3884. - Use the correct datatype in the SipHash-2-4 function to prevent
  3885. compilers from assuming any sort of alignment. Fixes bug 15436;
  3886. bugfix on 0.2.5.3-alpha.
  3887. o Minor bugfixes (preventative security, C safety):
  3888. - When reading a hexadecimal, base-32, or base-64 encoded value from
  3889. a string, always overwrite the whole output buffer. This prevents
  3890. some bugs where we would look at (but fortunately, not reveal)
  3891. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  3892. versions of Tor.
  3893. - Clear all memory targetted by tor_addr_{to,from}_sockaddr(), not
  3894. just the part that's used. This makes it harder for data leak bugs
  3895. to occur in the event of other programming failures. Resolves
  3896. ticket 14041.
  3897. o Minor bugfixes (relay):
  3898. - When generating our family list, remove spaces from around the
  3899. entries. Fixes bug 12728; bugfix on 0.2.1.7-alpha.
  3900. - If our previous bandwidth estimate was 0 bytes, allow publishing a
  3901. new relay descriptor immediately. Fixes bug 13000; bugfix
  3902. on 0.1.1.6-alpha.
  3903. o Minor bugfixes (shutdown):
  3904. - When shutting down, always call event_del() on lingering read or
  3905. write events before freeing them. Otherwise, we risk double-frees
  3906. or read-after-frees in event_base_free(). Fixes bug 12985; bugfix
  3907. on 0.1.0.2-rc.
  3908. o Minor bugfixes (small memory leaks):
  3909. - Avoid leaking memory when using IPv6 virtual address mappings.
  3910. Fixes bug 14123; bugfix on 0.2.4.7-alpha. Patch by Tom van
  3911. der Woerdt.
  3912. o Minor bugfixes (statistics):
  3913. - Increase period over which bandwidth observations are aggregated
  3914. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  3915. o Minor bugfixes (systemd support):
  3916. - Run correctly under systemd with the RunAsDaemon option set. Fixes
  3917. part of bug 14141; bugfix on 0.2.5.7-rc. Patch from Tomasz Torcz.
  3918. - Inform the systemd supervisor about more changes in the Tor
  3919. process status. Implements part of ticket 14141. Patch from
  3920. Tomasz Torcz.
  3921. o Minor bugfixes (testing networks):
  3922. - Fix TestingDirAuthVoteGuard to properly give out Guard flags in a
  3923. testing network. Fixes bug 13064; bugfix on 0.2.5.2-alpha.
  3924. - Stop using the default authorities in networks which provide both
  3925. AlternateDirAuthority and AlternateBridgeAuthority. Partially
  3926. fixes bug 13163; bugfix on 0.2.0.13-alpha.
  3927. o Minor bugfixes (testing networks, fast startup):
  3928. - Allow Tor to build circuits using a consensus with no exits. If
  3929. the consensus has no exits (typical of a bootstrapping test
  3930. network), allow Tor to build circuits once enough descriptors have
  3931. been downloaded. This assists in bootstrapping a testing Tor
  3932. network. Fixes bug 13718; bugfix on 0.2.4.10-alpha. Patch
  3933. by "teor".
  3934. - When V3AuthVotingInterval is low, give a lower If-Modified-Since
  3935. header to directory servers. This allows us to obtain consensuses
  3936. promptly when the consensus interval is very short. This assists
  3937. in bootstrapping a testing Tor network. Fixes parts of bugs 13718
  3938. and 13963; bugfix on 0.2.0.3-alpha. Patch by "teor".
  3939. - Stop assuming that private addresses are local when checking
  3940. reachability in a TestingTorNetwork. Instead, when testing, assume
  3941. all OR connections are remote. (This is necessary due to many test
  3942. scenarios running all relays on localhost.) This assists in
  3943. bootstrapping a testing Tor network. Fixes bug 13924; bugfix on
  3944. 0.1.0.1-rc. Patch by "teor".
  3945. - Avoid building exit circuits from a consensus with no exits. Now
  3946. thanks to our fix for 13718, we accept a no-exit network as not
  3947. wholly lost, but we need to remember not to try to build exit
  3948. circuits on it. Closes ticket 13814; patch by "teor".
  3949. - Stop requiring exits to have non-zero bandwithcapacity in a
  3950. TestingTorNetwork. Instead, when TestingMinExitFlagThreshold is 0,
  3951. ignore exit bandwidthcapacity. This assists in bootstrapping a
  3952. testing Tor network. Fixes parts of bugs 13718 and 13839; bugfix
  3953. on 0.2.0.3-alpha. Patch by "teor".
  3954. - Add "internal" to some bootstrap statuses when no exits are
  3955. available. If the consensus does not contain Exits, Tor will only
  3956. build internal circuits. In this case, relevant statuses will
  3957. contain the word "internal" as indicated in the Tor control-
  3958. spec.txt. When bootstrap completes, Tor will be ready to build
  3959. internal circuits. If a future consensus contains Exits, exit
  3960. circuits may become available. Fixes part of bug 13718; bugfix on
  3961. 0.2.4.10-alpha. Patch by "teor".
  3962. - Decrease minimum consensus interval to 10 seconds when
  3963. TestingTorNetwork is set, or 5 seconds for the first consensus.
  3964. Fix assumptions throughout the code that assume larger intervals.
  3965. Fixes bugs 13718 and 13823; bugfix on 0.2.0.3-alpha. Patch
  3966. by "teor".
  3967. - Avoid excluding guards from path building in minimal test
  3968. networks, when we're in a test network and excluding guards would
  3969. exclude all relays. This typically occurs in incredibly small tor
  3970. networks, and those using "TestingAuthVoteGuard *". Fixes part of
  3971. bug 13718; bugfix on 0.1.1.11-alpha. Patch by "teor".
  3972. o Minor bugfixes (testing):
  3973. - Avoid a side-effect in a tor_assert() in the unit tests. Fixes bug
  3974. 15188; bugfix on 0.1.2.3-alpha. Patch from Tom van der Woerdt.
  3975. - Stop spawn test failures due to a race condition between the
  3976. SIGCHLD handler updating the process status, and the test reading
  3977. it. Fixes bug 13291; bugfix on 0.2.3.3-alpha.
  3978. - Avoid passing an extra backslash when creating a temporary
  3979. directory for running the unit tests on Windows. Fixes bug 12392;
  3980. bugfix on 0.2.2.25-alpha. Patch from Gisle Vanem.
  3981. o Minor bugfixes (TLS):
  3982. - Check more thoroughly throughout the TLS code for possible
  3983. unlogged TLS errors. Possible diagnostic or fix for bug 13319.
  3984. o Minor bugfixes (transparent proxy):
  3985. - Use getsockname, not getsockopt, to retrieve the address for a
  3986. TPROXY-redirected connection. Fixes bug 13796; bugfix
  3987. on 0.2.5.2-alpha.
  3988. o Minor bugfixes (windows):
  3989. - Remove code to special-case handling of NTE_BAD_KEYSET when
  3990. acquiring windows CryptoAPI context. This error can't actually
  3991. occur for the parameters we're providing. Fixes bug 10816; bugfix
  3992. on 0.0.2pre26.
  3993. o Minor bugfixes (zlib):
  3994. - Avoid truncating a zlib stream when trying to finalize it with an
  3995. empty output buffer. Fixes bug 11824; bugfix on 0.1.1.23.
  3996. o Code simplification and refactoring:
  3997. - Change the entry_is_live() function to take named bitfield
  3998. elements instead of an unnamed list of booleans. Closes
  3999. ticket 12202.
  4000. - Refactor and unit-test entry_is_time_to_retry() in entrynodes.c.
  4001. Resolves ticket 12205.
  4002. - Use calloc and reallocarray functions instead of multiply-
  4003. then-malloc. This makes it less likely for us to fall victim to an
  4004. integer overflow attack when allocating. Resolves ticket 12855.
  4005. - Use the standard macro name SIZE_MAX, instead of our
  4006. own SIZE_T_MAX.
  4007. - Document usage of the NO_DIRINFO and ALL_DIRINFO flags clearly in
  4008. functions which take them as arguments. Replace 0 with NO_DIRINFO
  4009. in a function call for clarity. Seeks to prevent future issues
  4010. like 13163.
  4011. - Avoid 4 null pointer errors under clang static analysis by using
  4012. tor_assert() to prove that the pointers aren't null. Fixes
  4013. bug 13284.
  4014. - Rework the API of policies_parse_exit_policy() to use a bitmask to
  4015. represent parsing options, instead of a confusing mess of
  4016. booleans. Resolves ticket 8197.
  4017. - Introduce a helper function to parse ExitPolicy in
  4018. or_options_t structure.
  4019. - Move fields related to isolating and configuring client ports into
  4020. a shared structure. Previously, they were duplicated across
  4021. port_cfg_t, listener_connection_t, and edge_connection_t. Failure
  4022. to copy them correctly had been the cause of at least one bug in
  4023. the past. Closes ticket 8546.
  4024. - Refactor the get_interface_addresses_raw() doom-function into
  4025. multiple smaller and simpler subfunctions. Cover the resulting
  4026. subfunctions with unit-tests. Fixes a significant portion of
  4027. issue 12376.
  4028. - Remove workaround in dirserv_thinks_router_is_hs_dir() that was
  4029. only for version <= 0.2.2.24 which is now deprecated. Closes
  4030. ticket 14202.
  4031. - Remove a test for a long-defunct broken version-one
  4032. directory server.
  4033. - Refactor main loop to extract the 'loop' part. This makes it
  4034. easier to run Tor under Shadow. Closes ticket 15176.
  4035. - Stop using can_complete_circuits as a global variable; access it
  4036. with a function instead.
  4037. - Avoid using operators directly as macro arguments: this lets us
  4038. apply coccinelle transformations to our codebase more directly.
  4039. Closes ticket 13172.
  4040. - Combine the functions used to parse ClientTransportPlugin and
  4041. ServerTransportPlugin into a single function. Closes ticket 6456.
  4042. - Add inline functions and convenience macros for inspecting channel
  4043. state. Refactor the code to use convenience macros instead of
  4044. checking channel state directly. Fixes issue 7356.
  4045. - Document all members of was_router_added_t and rename
  4046. ROUTER_WAS_NOT_NEW to ROUTER_IS_ALREADY_KNOWN to make it less
  4047. confusable with ROUTER_WAS_TOO_OLD. Fixes issue 13644.
  4048. - In connection_exit_begin_conn(), use END_CIRC_REASON_TORPROTOCOL
  4049. constant instead of hardcoded value. Fixes issue 13840.
  4050. - Refactor our generic strmap and digestmap types into a single
  4051. implementation, so that we can add a new digest256map
  4052. type trivially.
  4053. o Documentation:
  4054. - Add a doc/TUNING document with tips for handling large numbers of
  4055. TCP connections when running busy Tor relay. Update the warning
  4056. message to point to this file when running out of sockets
  4057. operating system is allowing to use simultaneously. Resolves
  4058. ticket 9708.
  4059. - Adding section on OpenBSD to our TUNING document. Thanks to mmcc
  4060. for writing the OpenBSD-specific tips. Resolves ticket 13702.
  4061. - Make the tor-resolve documentation match its help string and its
  4062. options. Resolves part of ticket 14325.
  4063. - Log a more useful error message from tor-resolve when failing to
  4064. look up a hidden service address. Resolves part of ticket 14325.
  4065. - Document the bridge-authority-only 'networkstatus-bridges' file.
  4066. Closes ticket 13713; patch from "tom".
  4067. - Fix typo in PredictedPortsRelevanceTime option description in
  4068. manpage. Resolves issue 13707.
  4069. - Stop suggesting that users specify relays by nickname: it isn't a
  4070. good idea. Also, properly cross-reference how to specify relays in
  4071. all parts of manual documenting options that take a list of
  4072. relays. Closes ticket 13381.
  4073. - Clarify the HiddenServiceDir option description in manpage to make
  4074. it clear that relative paths are taken with respect to the current
  4075. working directory. Also clarify that this behavior is not
  4076. guaranteed to remain indefinitely. Fixes issue 13913.
  4077. o Distribution (systemd):
  4078. - systemd unit file: only allow tor to write to /var/lib/tor and
  4079. /var/log/tor. The rest of the filesystem is accessible for reading
  4080. only. Patch by intrigeri; resolves ticket 12751.
  4081. - systemd unit file: ensure that the process and all its children
  4082. can never gain new privileges. Patch by intrigeri; resolves
  4083. ticket 12939.
  4084. - systemd unit file: set up /var/run/tor as writable for the Tor
  4085. service. Patch by intrigeri; resolves ticket 13196.
  4086. o Downgraded warnings:
  4087. - Don't warn when we've attempted to contact a relay using the wrong
  4088. ntor onion key. Closes ticket 9635.
  4089. o Removed code:
  4090. - Remove some lingering dead code that once supported mempools.
  4091. Mempools were disabled by default in 0.2.5, and removed entirely
  4092. in 0.2.6.3-alpha. Closes more of ticket 14848; patch
  4093. by "cypherpunks".
  4094. o Removed features (directory authorities):
  4095. - Remove code that prevented authorities from listing Tor relays
  4096. affected by CVE-2011-2769 as guards. These relays are already
  4097. rejected altogether due to the minimum version requirement of
  4098. 0.2.3.16-alpha. Closes ticket 13152.
  4099. - The "AuthDirRejectUnlisted" option no longer has any effect, as
  4100. the fingerprints file (approved-routers) has been deprecated.
  4101. - Directory authorities do not support being Naming dirauths anymore.
  4102. The "NamingAuthoritativeDir" config option is now obsolete.
  4103. - Directory authorities do not support giving out the BadDirectory
  4104. flag anymore.
  4105. - Directory authorities no longer advertise or support consensus
  4106. methods 1 through 12 inclusive. These consensus methods were
  4107. obsolete and/or insecure: maintaining the ability to support them
  4108. served no good purpose. Implements part of proposal 215; closes
  4109. ticket 10163.
  4110. o Removed features:
  4111. - To avoid confusion with the "ExitRelay" option, "ExitNode" is no
  4112. longer silently accepted as an alias for "ExitNodes".
  4113. - The --enable-mempool and --enable-buf-freelists options, which
  4114. were originally created to work around bad malloc implementations,
  4115. no longer exist. They were off-by-default in 0.2.5. Closes
  4116. ticket 14848.
  4117. - We no longer remind the user about configuration options that have
  4118. been obsolete since 0.2.3.x or earlier. Patch by Adrien Bak.
  4119. - Remove our old, non-weighted bandwidth-based node selection code.
  4120. Previously, we used it as a fallback when we couldn't perform
  4121. weighted bandwidth-based node selection. But that would only
  4122. happen in the cases where we had no consensus, or when we had a
  4123. consensus generated by buggy or ancient directory authorities. In
  4124. either case, it's better to use the more modern, better maintained
  4125. algorithm, with reasonable defaults for the weights. Closes
  4126. ticket 13126.
  4127. - Remove the --disable-curve25519 configure option. Relays and
  4128. clients now are required to support curve25519 and the
  4129. ntor handshake.
  4130. - The old "StrictEntryNodes" and "StrictExitNodes" options, which
  4131. used to be deprecated synonyms for "StrictNodes", are now marked
  4132. obsolete. Resolves ticket 12226.
  4133. - Clients don't understand the BadDirectory flag in the consensus
  4134. anymore, and ignore it.
  4135. o Removed platform support:
  4136. - We no longer include special code to build on Windows CE; as far
  4137. as we know, nobody has used Tor on Windows CE in a very long time.
  4138. Closes ticket 11446.
  4139. o Testing (test-network.sh):
  4140. - Stop using "echo -n", as some shells' built-in echo doesn't
  4141. support "-n". Instead, use "/bin/echo -n". Partially fixes
  4142. bug 13161.
  4143. - Stop an apparent test-network hang when used with make -j2. Fixes
  4144. bug 13331.
  4145. - Add a --delay option to test-network.sh, which configures the
  4146. delay before the chutney network tests for data transmission.
  4147. Partially implements ticket 13161.
  4148. o Testing:
  4149. - Test that tor does not fail when key files are zero-length. Check
  4150. that tor generates new keys, and overwrites the empty key files.
  4151. - Test that tor generates new keys when keys are missing
  4152. (existing behavior).
  4153. - Test that tor does not overwrite key files that already contain
  4154. data (existing behavior). Tests bug 13111. Patch by "teor".
  4155. - New "make test-stem" target to run stem integration tests.
  4156. Requires that the "STEM_SOURCE_DIR" environment variable be set.
  4157. Closes ticket 14107.
  4158. - Make the test_cmdline_args.py script work correctly on Windows.
  4159. Patch from Gisle Vanem.
  4160. - Move the slower unit tests into a new "./src/test/test-slow"
  4161. binary that can be run independently of the other tests. Closes
  4162. ticket 13243.
  4163. - New tests for many parts of channel, relay, and circuitmux
  4164. functionality. Code by Andrea; part of 9262.
  4165. - New tests for parse_transport_line(). Part of ticket 6456.
  4166. - In the unit tests, use chgrp() to change the group of the unit
  4167. test temporary directory to the current user, so that the sticky
  4168. bit doesn't interfere with tests that check directory groups.
  4169. Closes 13678.
  4170. - Add unit tests for resolve_my_addr(). Part of ticket 12376; patch
  4171. by 'rl1987'.
  4172. - Refactor the function that chooses guard nodes so that it can more
  4173. easily be tested; write some tests for it.
  4174. - Fix and re-enable the fgets_eagain unit test. Fixes bug 12503;
  4175. bugfix on 0.2.3.1-alpha. Patch from "cypherpunks."
  4176. - Create unit tests for format_time_interval(). With bug 13393.
  4177. - Add unit tests for tor_timegm signed overflow, tor_timegm and
  4178. parse_rfc1123_time validity checks, correct_tm year clamping. Unit
  4179. tests (visible) fixes in bug 13476.
  4180. - Add a "coverage-html" make target to generate HTML-visualized
  4181. coverage results when building with --enable-coverage. (Requires
  4182. lcov.) Patch from Kevin Murray.
  4183. - Enable the backtrace handler (where supported) when running the
  4184. unit tests.
  4185. - Revise all unit tests that used the legacy test_* macros to
  4186. instead use the recommended tt_* macros. This patch was generated
  4187. with coccinelle, to avoid manual errors. Closes ticket 13119.
  4188. Changes in version 0.2.5.11 - 2015-03-17
  4189. Tor 0.2.5.11 is the second stable release in the 0.2.5 series.
  4190. It backports several bugfixes from the 0.2.6 branch, including a
  4191. couple of medium-level security fixes for relays and exit nodes.
  4192. It also updates the list of directory authorities.
  4193. o Directory authority changes:
  4194. - Remove turtles as a directory authority.
  4195. - Add longclaw as a new (v3) directory authority. This implements
  4196. ticket 13296. This keeps the directory authority count at 9.
  4197. - The directory authority Faravahar has a new IP address. This
  4198. closes ticket 14487.
  4199. o Major bugfixes (crash, OSX, security):
  4200. - Fix a remote denial-of-service opportunity caused by a bug in
  4201. OSX's _strlcat_chk() function. Fixes bug 15205; bug first appeared
  4202. in OSX 10.9.
  4203. o Major bugfixes (relay, stability, possible security):
  4204. - Fix a bug that could lead to a relay crashing with an assertion
  4205. failure if a buffer of exactly the wrong layout was passed to
  4206. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  4207. 0.2.0.10-alpha. Patch from 'cypherpunks'.
  4208. - Do not assert if the 'data' pointer on a buffer is advanced to the
  4209. very end of the buffer; log a BUG message instead. Only assert if
  4210. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  4211. o Major bugfixes (exit node stability):
  4212. - Fix an assertion failure that could occur under high DNS load.
  4213. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  4214. diagnosed and fixed by "cypherpunks".
  4215. o Major bugfixes (Linux seccomp2 sandbox):
  4216. - Upon receiving sighup with the seccomp2 sandbox enabled, do not
  4217. crash during attempts to call wait4. Fixes bug 15088; bugfix on
  4218. 0.2.5.1-alpha. Patch from "sanic".
  4219. o Minor features (controller):
  4220. - New "GETINFO bw-event-cache" to get information about recent
  4221. bandwidth events. Closes ticket 14128. Useful for controllers to
  4222. get recent bandwidth history after the fix for ticket 13988.
  4223. o Minor features (geoip):
  4224. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  4225. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  4226. Country database.
  4227. o Minor bugfixes (client, automapping):
  4228. - Avoid crashing on torrc lines for VirtualAddrNetworkIPv[4|6] when
  4229. no value follows the option. Fixes bug 14142; bugfix on
  4230. 0.2.4.7-alpha. Patch by "teor".
  4231. - Fix a memory leak when using AutomapHostsOnResolve. Fixes bug
  4232. 14195; bugfix on 0.1.0.1-rc.
  4233. o Minor bugfixes (compilation):
  4234. - Build without warnings with the stock OpenSSL srtp.h header, which
  4235. has a duplicate declaration of SSL_get_selected_srtp_profile().
  4236. Fixes bug 14220; this is OpenSSL's bug, not ours.
  4237. o Minor bugfixes (directory authority):
  4238. - Allow directory authorities to fetch more data from one another if
  4239. they find themselves missing lots of votes. Previously, they had
  4240. been bumping against the 10 MB queued data limit. Fixes bug 14261;
  4241. bugfix on 0.1.2.5-alpha.
  4242. - Enlarge the buffer to read bwauth generated files to avoid an
  4243. issue when parsing the file in dirserv_read_measured_bandwidths().
  4244. Fixes bug 14125; bugfix on 0.2.2.1-alpha.
  4245. o Minor bugfixes (statistics):
  4246. - Increase period over which bandwidth observations are aggregated
  4247. from 15 minutes to 4 hours. Fixes bug 13988; bugfix on 0.0.8pre1.
  4248. o Minor bugfixes (preventative security, C safety):
  4249. - When reading a hexadecimal, base-32, or base-64 encoded value from
  4250. a string, always overwrite the whole output buffer. This prevents
  4251. some bugs where we would look at (but fortunately, not reveal)
  4252. uninitialized memory on the stack. Fixes bug 14013; bugfix on all
  4253. versions of Tor.
  4254. Changes in version 0.2.4.26 - 2015-03-17
  4255. Tor 0.2.4.26 includes an updated list of directory authorities. It
  4256. also backports a couple of stability and security bugfixes from 0.2.5
  4257. and beyond.
  4258. o Directory authority changes:
  4259. - Remove turtles as a directory authority.
  4260. - Add longclaw as a new (v3) directory authority. This implements
  4261. ticket 13296. This keeps the directory authority count at 9.
  4262. - The directory authority Faravahar has a new IP address. This
  4263. closes ticket 14487.
  4264. o Major bugfixes (exit node stability, also in 0.2.6.3-alpha):
  4265. - Fix an assertion failure that could occur under high DNS load.
  4266. Fixes bug 14129; bugfix on Tor 0.0.7rc1. Found by "jowr";
  4267. diagnosed and fixed by "cypherpunks".
  4268. o Major bugfixes (relay, stability, possible security, also in 0.2.6.4-rc):
  4269. - Fix a bug that could lead to a relay crashing with an assertion
  4270. failure if a buffer of exactly the wrong layout was passed to
  4271. buf_pullup() at exactly the wrong time. Fixes bug 15083; bugfix on
  4272. 0.2.0.10-alpha. Patch from 'cypherpunks'.
  4273. - Do not assert if the 'data' pointer on a buffer is advanced to the
  4274. very end of the buffer; log a BUG message instead. Only assert if
  4275. it is past that point. Fixes bug 15083; bugfix on 0.2.0.10-alpha.
  4276. o Minor features (geoip):
  4277. - Update geoip to the March 3 2015 Maxmind GeoLite2 Country database.
  4278. - Update geoip6 to the March 3 2015 Maxmind GeoLite2
  4279. Country database.
  4280. Changes in version 0.2.5.10 - 2014-10-24
  4281. Tor 0.2.5.10 is the first stable release in the 0.2.5 series.
  4282. It adds several new security features, including improved
  4283. denial-of-service resistance for relays, new compiler hardening
  4284. options, and a system-call sandbox for hardened installations on Linux
  4285. (requires seccomp2). The controller protocol has several new features,
  4286. resolving IPv6 addresses should work better than before, and relays
  4287. should be a little more CPU-efficient. We've added support for more
  4288. OpenBSD and FreeBSD transparent proxy types. We've improved the build
  4289. system and testing infrastructure to allow unit testing of more parts
  4290. of the Tor codebase. Finally, we've addressed several nagging pluggable
  4291. transport usability issues, and included numerous other small bugfixes
  4292. and features mentioned below.
  4293. This release marks end-of-life for Tor 0.2.3.x; those Tor versions
  4294. have accumulated many known flaws; everyone should upgrade.
  4295. o Major features (security):
  4296. - The ntor handshake is now on-by-default, no matter what the
  4297. directory authorities recommend. Implements ticket 8561.
  4298. - Make the "tor-gencert" tool used by directory authority operators
  4299. create 2048-bit signing keys by default (rather than 1024-bit, since
  4300. 1024-bit is uncomfortably small these days). Addresses ticket 10324.
  4301. - Warn about attempts to run hidden services and relays in the same
  4302. process: that's probably not a good idea. Closes ticket 12908.
  4303. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  4304. today support TLS 1.0 or later, so we can safely turn off support
  4305. for this old (and insecure) protocol. Fixes bug 13426.
  4306. o Major features (relay security, DoS-resistance):
  4307. - When deciding whether we have run out of memory and we need to
  4308. close circuits, also consider memory allocated in buffers for
  4309. streams attached to each circuit.
  4310. This change, which extends an anti-DoS feature introduced in
  4311. 0.2.4.13-alpha and improved in 0.2.4.14-alpha, lets Tor exit relays
  4312. better resist more memory-based DoS attacks than before. Since the
  4313. MaxMemInCellQueues option now applies to all queues, it is renamed
  4314. to MaxMemInQueues. This feature fixes bug 10169.
  4315. - Avoid hash-flooding denial-of-service attacks by using the secure
  4316. SipHash-2-4 hash function for our hashtables. Without this
  4317. feature, an attacker could degrade performance of a targeted
  4318. client or server by flooding their data structures with a large
  4319. number of entries to be stored at the same hash table position,
  4320. thereby slowing down the Tor instance. With this feature, hash
  4321. table positions are derived from a randomized cryptographic key,
  4322. and an attacker cannot predict which entries will collide. Closes
  4323. ticket 4900.
  4324. - If you don't specify MaxMemInQueues yourself, Tor now tries to
  4325. pick a good value based on your total system memory. Previously,
  4326. the default was always 8 GB. You can still override the default by
  4327. setting MaxMemInQueues yourself. Resolves ticket 11396.
  4328. o Major features (bridges and pluggable transports):
  4329. - Add support for passing arguments to managed pluggable transport
  4330. proxies. Implements ticket 3594.
  4331. - Bridges now track GeoIP information and the number of their users
  4332. even when pluggable transports are in use, and report usage
  4333. statistics in their extra-info descriptors. Resolves tickets 4773
  4334. and 5040.
  4335. - Don't launch pluggable transport proxies if we don't have any
  4336. bridges configured that would use them. Now we can list many
  4337. pluggable transports, and Tor will dynamically start one when it
  4338. hears a bridge address that needs it. Resolves ticket 5018.
  4339. - The bridge directory authority now assigns status flags (Stable,
  4340. Guard, etc) to bridges based on thresholds calculated over all
  4341. Running bridges. Now bridgedb can finally make use of its features
  4342. to e.g. include at least one Stable bridge in its answers. Fixes
  4343. bug 9859.
  4344. o Major features (controller):
  4345. - Extend ORCONN controller event to include an "ID" parameter,
  4346. and add four new controller event types CONN_BW, CIRC_BW,
  4347. CELL_STATS, and TB_EMPTY that show connection and circuit usage.
  4348. The new events are emitted in private Tor networks only, with the
  4349. goal of being able to better track performance and load during
  4350. full-network simulations. Implements proposal 218 and ticket 7359.
  4351. o Major features (relay performance):
  4352. - Speed up server-side lookups of rendezvous and introduction point
  4353. circuits by using hashtables instead of linear searches. These
  4354. functions previously accounted between 3 and 7% of CPU usage on
  4355. some busy relays. Resolves ticket 9841.
  4356. - Avoid wasting CPU when extending a circuit over a channel that is
  4357. nearly out of circuit IDs. Previously, we would do a linear scan
  4358. over possible circuit IDs before finding one or deciding that we
  4359. had exhausted our possibilities. Now, we try at most 64 random
  4360. circuit IDs before deciding that we probably won't succeed. Fixes
  4361. a possible root cause of ticket 11553.
  4362. o Major features (seccomp2 sandbox, Linux only):
  4363. - Use the seccomp2 syscall filtering facility on Linux to limit
  4364. which system calls Tor can invoke. This is an experimental,
  4365. Linux-only feature to provide defense-in-depth against unknown
  4366. attacks. To try turning it on, set "Sandbox 1" in your torrc
  4367. file. Please be ready to report bugs. We hope to add support
  4368. for better sandboxing in the future, including more fine-grained
  4369. filters, better division of responsibility, and support for more
  4370. platforms. This work has been done by Cristian-Matei Toader for
  4371. Google Summer of Code. Resolves tickets 11351 and 11465.
  4372. o Major features (testing networks):
  4373. - Make testing Tor networks bootstrap better: lower directory fetch
  4374. retry schedules and maximum interval without directory requests,
  4375. and raise maximum download tries. Implements ticket 6752.
  4376. - Add make target 'test-network' to run tests on a Chutney network.
  4377. Implements ticket 8530.
  4378. o Major features (other):
  4379. - On some platforms (currently: recent OSX versions, glibc-based
  4380. platforms that support the ELF format, and a few other
  4381. Unix-like operating systems), Tor can now dump stack traces
  4382. when a crash occurs or an assertion fails. By default, traces
  4383. are dumped to stderr (if possible) and to any logs that are
  4384. reporting errors. Implements ticket 9299.
  4385. o Deprecated versions:
  4386. - Tor 0.2.3.x has reached end-of-life; it has received no patches or
  4387. attention for some while.
  4388. o Major bugfixes (security, directory authorities):
  4389. - Directory authorities now include a digest of each relay's
  4390. identity key as a part of its microdescriptor.
  4391. This is a workaround for bug 11743 (reported by "cypherpunks"),
  4392. where Tor clients do not support receiving multiple
  4393. microdescriptors with the same SHA256 digest in the same
  4394. consensus. When clients receive a consensus like this, they only
  4395. use one of the relays. Without this fix, a hostile relay could
  4396. selectively disable some client use of target relays by
  4397. constructing a router descriptor with a different identity and the
  4398. same microdescriptor parameters and getting the authorities to
  4399. list it in a microdescriptor consensus. This fix prevents an
  4400. attacker from causing a microdescriptor collision, because the
  4401. router's identity is not forgeable.
  4402. o Major bugfixes (openssl bug workaround):
  4403. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  4404. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes
  4405. bug 13471. This is a workaround for an OpenSSL bug.
  4406. o Major bugfixes (client):
  4407. - Perform circuit cleanup operations even when circuit
  4408. construction operations are disabled (because the network is
  4409. disabled, or because there isn't enough directory information).
  4410. Previously, when we were not building predictive circuits, we
  4411. were not closing expired circuits either. Fixes bug 8387; bugfix on
  4412. 0.1.1.11-alpha. This bug became visible in 0.2.4.10-alpha when we
  4413. became more strict about when we have "enough directory information
  4414. to build circuits".
  4415. o Major bugfixes (client, pluggable transports):
  4416. - When managing pluggable transports, use OS notification facilities
  4417. to learn if they have crashed, and don't attempt to kill any
  4418. process that has already exited. Fixes bug 8746; bugfix
  4419. on 0.2.3.6-alpha.
  4420. o Major bugfixes (relay denial of service):
  4421. - Instead of writing destroy cells directly to outgoing connection
  4422. buffers, queue them and intersperse them with other outgoing cells.
  4423. This can prevent a set of resource starvation conditions where too
  4424. many pending destroy cells prevent data cells from actually getting
  4425. delivered. Reported by "oftc_must_be_destroyed". Fixes bug 7912;
  4426. bugfix on 0.2.0.1-alpha.
  4427. o Major bugfixes (relay):
  4428. - Avoid queuing or sending destroy cells for circuit ID zero when we
  4429. fail to send a CREATE cell. Fixes bug 12848; bugfix on 0.0.8pre1.
  4430. Found and fixed by "cypherpunks".
  4431. - Fix ORPort reachability detection on relays running behind a
  4432. proxy, by correctly updating the "local" mark on the controlling
  4433. channel when changing the address of an or_connection_t after the
  4434. handshake. Fixes bug 12160; bugfix on 0.2.4.4-alpha.
  4435. - Use a direct dirport connection when uploading non-anonymous
  4436. descriptors to the directory authorities. Previously, relays would
  4437. incorrectly use tunnel connections under a fairly wide variety of
  4438. circumstances. Fixes bug 11469; bugfix on 0.2.4.3-alpha.
  4439. - When a circuit accidentally has the same circuit ID for its
  4440. forward and reverse direction, correctly detect the direction of
  4441. cells using that circuit. Previously, this bug made roughly one
  4442. circuit in a million non-functional. Fixes bug 12195; this is a
  4443. bugfix on every version of Tor.
  4444. o Minor features (security):
  4445. - New --enable-expensive-hardening option to enable security
  4446. hardening options that consume nontrivial amounts of CPU and
  4447. memory. Right now, this includes AddressSanitizer and UbSan, which
  4448. are supported in newer versions of GCC and Clang. Closes ticket
  4449. 11477.
  4450. - Authorities now assign the Guard flag to the fastest 25% of the
  4451. network (it used to be the fastest 50%). Also raise the consensus
  4452. weight that guarantees the Guard flag from 250 to 2000. For the
  4453. current network, this results in about 1100 guards, down from 2500.
  4454. This step paves the way for moving the number of entry guards
  4455. down to 1 (proposal 236) while still providing reasonable expected
  4456. performance for most users. Implements ticket 12690.
  4457. o Minor features (security, memory management):
  4458. - Memory allocation tricks (mempools and buffer freelists) are now
  4459. disabled by default. You can turn them back on with
  4460. --enable-mempools and --enable-buf-freelists respectively. We're
  4461. disabling these features because malloc performance is good enough
  4462. on most platforms, and a similar feature in OpenSSL exacerbated
  4463. exploitation of the Heartbleed attack. Resolves ticket 11476.
  4464. o Minor features (bridge client):
  4465. - Report a more useful failure message when we can't connect to a
  4466. bridge because we don't have the right pluggable transport
  4467. configured. Resolves ticket 9665. Patch from Fábio J. Bertinatto.
  4468. o Minor features (bridge):
  4469. - Add an ExtORPortCookieAuthFileGroupReadable option to make the
  4470. cookie file for the ExtORPort g+r by default.
  4471. o Minor features (bridges, pluggable transports):
  4472. - Bridges now write the SHA1 digest of their identity key
  4473. fingerprint (that is, a hash of a hash of their public key) to
  4474. notice-level logs, and to a new hashed-fingerprint file. This
  4475. information will help bridge operators look up their bridge in
  4476. Globe and similar tools. Resolves ticket 10884.
  4477. - Improve the message that Tor displays when running as a bridge
  4478. using pluggable transports without an Extended ORPort listener.
  4479. Also, log the message in the log file too. Resolves ticket 11043.
  4480. - Add threshold cutoffs to the networkstatus document created by
  4481. the Bridge Authority. Fixes bug 1117.
  4482. - On Windows, spawn background processes using the CREATE_NO_WINDOW
  4483. flag. Now Tor Browser Bundle 3.5 with pluggable transports enabled
  4484. doesn't pop up a blank console window. (In Tor Browser Bundle 2.x,
  4485. Vidalia set this option for us.) Implements ticket 10297.
  4486. o Minor features (build):
  4487. - The configure script has a --disable-seccomp option to turn off
  4488. support for libseccomp on systems that have it, in case it (or
  4489. Tor's use of it) is broken. Resolves ticket 11628.
  4490. - Assume that a user using ./configure --host wants to cross-compile,
  4491. and give an error if we cannot find a properly named
  4492. tool-chain. Add a --disable-tool-name-check option to proceed
  4493. nevertheless. Addresses ticket 9869. Patch by Benedikt Gollatz.
  4494. - If we run ./configure and the compiler recognizes -fstack-protector
  4495. but the linker rejects it, warn the user about a potentially missing
  4496. libssp package. Addresses ticket 9948. Patch from Benedikt Gollatz.
  4497. - Add support for `--library-versions` flag. Implements ticket 6384.
  4498. - Return the "unexpected sendme" warnings to a warn severity, but make
  4499. them rate limited, to help diagnose ticket 8093.
  4500. - Detect a missing asciidoc, and warn the user about it, during
  4501. configure rather than at build time. Fixes issue 6506. Patch from
  4502. Arlo Breault.
  4503. o Minor features (client):
  4504. - Add a new option, PredictedPortsRelevanceTime, to control how long
  4505. after having received a request to connect to a given port Tor
  4506. will try to keep circuits ready in anticipation of future requests
  4507. for that port. Patch from "unixninja92"; implements ticket 9176.
  4508. o Minor features (config options and command line):
  4509. - Add an --allow-missing-torrc commandline option that tells Tor to
  4510. run even if the configuration file specified by -f is not available.
  4511. Implements ticket 10060.
  4512. - Add support for the TPROXY transparent proxying facility on Linux.
  4513. See documentation for the new TransProxyType option for more
  4514. details. Implementation by "thomo". Closes ticket 10582.
  4515. o Minor features (config options):
  4516. - Config (torrc) lines now handle fingerprints which are missing
  4517. their initial '$'. Resolves ticket 4341; improvement over 0.0.9pre5.
  4518. - Support a --dump-config option to print some or all of the
  4519. configured options. Mainly useful for debugging the command-line
  4520. option parsing code. Helps resolve ticket 4647.
  4521. - Raise awareness of safer logging: notify user of potentially
  4522. unsafe config options, like logging more verbosely than severity
  4523. "notice" or setting SafeLogging to 0. Resolves ticket 5584.
  4524. - Add a new configuration option TestingV3AuthVotingStartOffset
  4525. that bootstraps a network faster by changing the timing for
  4526. consensus votes. Addresses ticket 8532.
  4527. - Add a new torrc option "ServerTransportOptions" that allows
  4528. bridge operators to pass configuration parameters to their
  4529. pluggable transports. Resolves ticket 8929.
  4530. - The config (torrc) file now accepts bandwidth and space limits in
  4531. bits as well as bytes. (Anywhere that you can say "2 Kilobytes",
  4532. you can now say "16 kilobits", and so on.) Resolves ticket 9214.
  4533. Patch by CharlieB.
  4534. o Minor features (controller):
  4535. - Make the entire exit policy available from the control port via
  4536. GETINFO exit-policy/*. Implements enhancement 7952. Patch from
  4537. "rl1987".
  4538. - Because of the fix for ticket 11396, the real limit for memory
  4539. usage may no longer match the configured MaxMemInQueues value. The
  4540. real limit is now exposed via GETINFO limits/max-mem-in-queues.
  4541. - Add a new "HS_DESC" controller event that reports activities
  4542. related to hidden service descriptors. Resolves ticket 8510.
  4543. - New "DROPGUARDS" controller command to forget all current entry
  4544. guards. Not recommended for ordinary use, since replacing guards
  4545. too frequently makes several attacks easier. Resolves ticket 9934;
  4546. patch from "ra".
  4547. - Implement the TRANSPORT_LAUNCHED control port event that
  4548. notifies controllers about new launched pluggable
  4549. transports. Resolves ticket 5609.
  4550. o Minor features (diagnostic):
  4551. - When logging a warning because of bug 7164, additionally check the
  4552. hash table for consistency (as proposed on ticket 11737). This may
  4553. help diagnose bug 7164.
  4554. - When we log a heartbeat, log how many one-hop circuits we have
  4555. that are at least 30 minutes old, and log status information about
  4556. a few of them. This is an attempt to track down bug 8387.
  4557. - When encountering an unexpected CR while writing text to a file on
  4558. Windows, log the name of the file. Should help diagnosing
  4559. bug 11233.
  4560. - Give more specific warnings when a client notices that an onion
  4561. handshake has failed. Fixes ticket 9635.
  4562. - Add significant new logging code to attempt to diagnose bug 12184,
  4563. where relays seem to run out of available circuit IDs.
  4564. - Improve the diagnostic log message for bug 8387 even further to
  4565. try to improve our odds of figuring out why one-hop directory
  4566. circuits sometimes do not get closed.
  4567. - Add more log messages to diagnose bug 7164, which causes
  4568. intermittent "microdesc_free() called but md was still referenced"
  4569. warnings. We now include more information, to figure out why we
  4570. might be cleaning a microdescriptor for being too old if it's
  4571. still referenced by a live node_t object.
  4572. - Log current accounting state (bytes sent and received + remaining
  4573. time for the current accounting period) in the relay's heartbeat
  4574. message. Implements ticket 5526; patch from Peter Retzlaff.
  4575. o Minor features (geoip):
  4576. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  4577. Country database.
  4578. o Minor features (interface):
  4579. - Generate a warning if any ports are listed in the SocksPolicy,
  4580. DirPolicy, AuthDirReject, AuthDirInvalid, AuthDirBadDir, or
  4581. AuthDirBadExit options. (These options only support address
  4582. ranges.) Fixes part of ticket 11108.
  4583. o Minor features (kernel API usage):
  4584. - Use the SOCK_NONBLOCK socket type, if supported, to open nonblocking
  4585. sockets in a single system call. Implements ticket 5129.
  4586. o Minor features (log messages):
  4587. - When ServerTransportPlugin is set on a bridge, Tor can write more
  4588. useful statistics about bridge use in its extrainfo descriptors,
  4589. but only if the Extended ORPort ("ExtORPort") is set too. Add a
  4590. log message to inform the user in this case. Resolves ticket 9651.
  4591. - When receiving a new controller connection, log the origin address.
  4592. Resolves ticket 9698; patch from "sigpipe".
  4593. - When logging OpenSSL engine status at startup, log the status of
  4594. more engines. Fixes ticket 10043; patch from Joshua Datko.
  4595. o Minor features (log verbosity):
  4596. - Demote the message that we give when a flushing connection times
  4597. out for too long from NOTICE to INFO. It was usually meaningless.
  4598. Resolves ticket 5286.
  4599. - Don't log so many notice-level bootstrapping messages at startup
  4600. about downloading descriptors. Previously, we'd log a notice
  4601. whenever we learned about more routers. Now, we only log a notice
  4602. at every 5% of progress. Fixes bug 9963.
  4603. - Warn less verbosely when receiving a malformed
  4604. ESTABLISH_RENDEZVOUS cell. Fixes ticket 11279.
  4605. o Minor features (performance):
  4606. - If we're using the pure-C 32-bit curve25519_donna implementation
  4607. of curve25519, build it with the -fomit-frame-pointer option to
  4608. make it go faster on register-starved hosts. This improves our
  4609. handshake performance by about 6% on i386 hosts without nacl.
  4610. Closes ticket 8109.
  4611. o Minor features (relay):
  4612. - If a circuit timed out for at least 3 minutes, check if we have a
  4613. new external IP address, and publish a new descriptor with the new
  4614. IP address if it changed. Resolves ticket 2454.
  4615. o Minor features (testing):
  4616. - If Python is installed, "make check" now runs extra tests beyond
  4617. the unit test scripts.
  4618. - When bootstrapping a test network, sometimes very few relays get
  4619. the Guard flag. Now a new option "TestingDirAuthVoteGuard" can
  4620. specify a set of relays which should be voted Guard regardless of
  4621. their uptime or bandwidth. Addresses ticket 9206.
  4622. o Minor features (transparent proxy, *BSD):
  4623. - Support FreeBSD's ipfw firewall interface for TransPort ports on
  4624. FreeBSD. To enable it, set "TransProxyType ipfw". Resolves ticket
  4625. 10267; patch from "yurivict".
  4626. - Support OpenBSD's divert-to rules with the pf firewall for
  4627. transparent proxy ports. To enable it, set "TransProxyType
  4628. pf-divert". This allows Tor to run a TransPort transparent proxy
  4629. port on OpenBSD 4.4 or later without root privileges. See the
  4630. pf.conf(5) manual page for information on configuring pf to use
  4631. divert-to rules. Closes ticket 10896; patch from Dana Koch.
  4632. o Minor bugfixes (bridge client):
  4633. - Stop accepting bridge lines containing hostnames. Doing so would
  4634. cause clients to perform DNS requests on the hostnames, which was
  4635. not sensible behavior. Fixes bug 10801; bugfix on 0.2.0.1-alpha.
  4636. o Minor bugfixes (bridges):
  4637. - Avoid potential crashes or bad behavior when launching a
  4638. server-side managed proxy with ORPort or ExtORPort temporarily
  4639. disabled. Fixes bug 9650; bugfix on 0.2.3.16-alpha.
  4640. - Fix a bug where the first connection works to a bridge that uses a
  4641. pluggable transport with client-side parameters, but we don't send
  4642. the client-side parameters on subsequent connections. (We don't
  4643. use any pluggable transports with client-side parameters yet,
  4644. but ScrambleSuit will soon become the first one.) Fixes bug 9162;
  4645. bugfix on 0.2.0.3-alpha. Based on a patch from "rl1987".
  4646. o Minor bugfixes (build, auxiliary programs):
  4647. - Stop preprocessing the "torify" script with autoconf, since
  4648. it no longer refers to LOCALSTATEDIR. Fixes bug 5505; patch
  4649. from Guilhem.
  4650. - The tor-fw-helper program now follows the standard convention and
  4651. exits with status code "0" on success. Fixes bug 9030; bugfix on
  4652. 0.2.3.1-alpha. Patch by Arlo Breault.
  4653. - Corrected ./configure advice for what openssl dev package you should
  4654. install on Debian. Fixes bug 9207; bugfix on 0.2.0.1-alpha.
  4655. o Minor bugfixes (client):
  4656. - Avoid "Tried to open a socket with DisableNetwork set" warnings
  4657. when starting a client with bridges configured and DisableNetwork
  4658. set. (Tor launcher starts Tor with DisableNetwork set the first
  4659. time it runs.) Fixes bug 10405; bugfix on 0.2.3.9-alpha.
  4660. - Improve the log message when we can't connect to a hidden service
  4661. because all of the hidden service directory nodes hosting its
  4662. descriptor are excluded. Improves on our fix for bug 10722, which
  4663. was a bugfix on 0.2.0.10-alpha.
  4664. - Raise a control port warning when we fail to connect to all of
  4665. our bridges. Previously, we didn't inform the controller, and
  4666. the bootstrap process would stall. Fixes bug 11069; bugfix on
  4667. 0.2.1.2-alpha.
  4668. - Exit immediately when a process-owning controller exits.
  4669. Previously, tor relays would wait for a little while after their
  4670. controller exited, as if they had gotten an INT signal -- but this
  4671. was problematic, since there was no feedback for the user. To do a
  4672. clean shutdown, controllers should send an INT signal and give Tor
  4673. a chance to clean up. Fixes bug 10449; bugfix on 0.2.2.28-beta.
  4674. - Stop attempting to connect to bridges before our pluggable
  4675. transports are configured (harmless but resulted in some erroneous
  4676. log messages). Fixes bug 11156; bugfix on 0.2.3.2-alpha.
  4677. - Fix connections to IPv6 addresses over SOCKS5. Previously, we were
  4678. generating incorrect SOCKS5 responses, and confusing client
  4679. applications. Fixes bug 10987; bugfix on 0.2.4.7-alpha.
  4680. o Minor bugfixes (client, DNSPort):
  4681. - When using DNSPort, try to respond to AAAA requests with AAAA
  4682. answers. Previously, we hadn't looked at the request type when
  4683. deciding which answer type to prefer. Fixes bug 10468; bugfix on
  4684. 0.2.4.7-alpha.
  4685. - When receiving a DNS query for an unsupported record type, reply
  4686. with no answer rather than with a NOTIMPL error. This behavior
  4687. isn't correct either, but it will break fewer client programs, we
  4688. hope. Fixes bug 10268; bugfix on 0.2.0.1-alpha. Original patch
  4689. from "epoch".
  4690. o Minor bugfixes (client, logging during bootstrap):
  4691. - Only report the first fatal bootstrap error on a given OR
  4692. connection. This stops us from telling the controller bogus error
  4693. messages like "DONE". Fixes bug 10431; bugfix on 0.2.1.1-alpha.
  4694. - Avoid generating spurious warnings when starting with
  4695. DisableNetwork enabled. Fixes bug 11200 and bug 10405; bugfix on
  4696. 0.2.3.9-alpha.
  4697. o Minor bugfixes (closing OR connections):
  4698. - If write_to_buf() in connection_write_to_buf_impl_() ever fails,
  4699. check if it's an or_connection_t and correctly call
  4700. connection_or_close_for_error() rather than
  4701. connection_mark_for_close() directly. Fixes bug 11304; bugfix on
  4702. 0.2.4.4-alpha.
  4703. - When closing all connections on setting DisableNetwork to 1, use
  4704. connection_or_close_normally() rather than closing OR connections
  4705. out from under the channel layer. Fixes bug 11306; bugfix on
  4706. 0.2.4.4-alpha.
  4707. o Minor bugfixes (code correctness):
  4708. - Previously we used two temporary files when writing descriptors to
  4709. disk; now we only use one. Fixes bug 1376.
  4710. - Remove an erroneous (but impossible and thus harmless) pointer
  4711. comparison that would have allowed compilers to skip a bounds
  4712. check in channeltls.c. Fixes bugs 10313 and 9980; bugfix on
  4713. 0.2.0.10-alpha. Noticed by Jared L Wong and David Fifield.
  4714. - Fix an always-true assertion in pluggable transports code so it
  4715. actually checks what it was trying to check. Fixes bug 10046;
  4716. bugfix on 0.2.3.9-alpha. Found by "dcb".
  4717. o Minor bugfixes (command line):
  4718. - Use a single command-line parser for parsing torrc options on the
  4719. command line and for finding special command-line options to avoid
  4720. inconsistent behavior for torrc option arguments that have the same
  4721. names as command-line options. Fixes bugs 4647 and 9578; bugfix on
  4722. 0.0.9pre5.
  4723. - No longer allow 'tor --hash-password' with no arguments. Fixes bug
  4724. 9573; bugfix on 0.0.9pre5.
  4725. o Minor bugfixes (compilation):
  4726. - Compile correctly with builds and forks of OpenSSL (such as
  4727. LibreSSL) that disable compression. Fixes bug 12602; bugfix on
  4728. 0.2.1.1-alpha. Patch from "dhill".
  4729. - Restore the ability to compile Tor with V2_HANDSHAKE_SERVER
  4730. turned off (that is, without support for v2 link handshakes). Fixes
  4731. bug 4677; bugfix on 0.2.3.2-alpha. Patch from "piet".
  4732. - In routerlist_assert_ok(), don't take the address of a
  4733. routerinfo's cache_info member unless that routerinfo is non-NULL.
  4734. Fixes bug 13096; bugfix on 0.1.1.9-alpha. Patch by "teor".
  4735. - Fix a large number of false positive warnings from the clang
  4736. analyzer static analysis tool. This should make real warnings
  4737. easier for clang analyzer to find. Patch from "teor". Closes
  4738. ticket 13036.
  4739. - Resolve GCC complaints on OpenBSD about discarding constness in
  4740. TO_{ORIGIN,OR}_CIRCUIT functions. Fixes part of bug 11633; bugfix
  4741. on 0.1.1.23. Patch from Dana Koch.
  4742. - Resolve clang complaints on OpenBSD with -Wshorten-64-to-32 due to
  4743. treatment of long and time_t as comparable types. Fixes part of
  4744. bug 11633. Patch from Dana Koch.
  4745. - When deciding whether to build the 64-bit curve25519
  4746. implementation, detect platforms where we can compile 128-bit
  4747. arithmetic but cannot link it. Fixes bug 11729; bugfix on
  4748. 0.2.4.8-alpha. Patch from "conradev".
  4749. - Fix compilation when DNS_CACHE_DEBUG is enabled. Fixes bug 11761;
  4750. bugfix on 0.2.3.13-alpha. Found by "cypherpunks".
  4751. - Fix compilation with dmalloc. Fixes bug 11605; bugfix
  4752. on 0.2.4.10-alpha.
  4753. - Build and run correctly on systems like OpenBSD-current that have
  4754. patched OpenSSL to remove get_cipher_by_char and/or its
  4755. implementations. Fixes issue 13325.
  4756. o Minor bugfixes (controller and command-line):
  4757. - If changing a config option via "setconf" fails in a recoverable
  4758. way, we used to nonetheless write our new control ports to the
  4759. file described by the "ControlPortWriteToFile" option. Now we only
  4760. write out that file if we successfully switch to the new config
  4761. option. Fixes bug 5605; bugfix on 0.2.2.26-beta. Patch from "Ryman".
  4762. o Minor bugfixes (directory server):
  4763. - No longer accept malformed http headers when parsing urls from
  4764. headers. Now we reply with Bad Request ("400"). Fixes bug 2767;
  4765. bugfix on 0.0.6pre1.
  4766. - When sending a compressed set of descriptors or microdescriptors,
  4767. make sure to finalize the zlib stream. Previously, we would write
  4768. all the compressed data, but if the last descriptor we wanted to
  4769. send was missing or too old, we would not mark the stream as
  4770. finished. This caused problems for decompression tools. Fixes bug
  4771. 11648; bugfix on 0.1.1.23.
  4772. o Minor bugfixes (hidden service):
  4773. - Only retry attempts to connect to a chosen rendezvous point 8
  4774. times, not 30. Fixes bug 4241; bugfix on 0.1.0.1-rc.
  4775. o Minor bugfixes (interface):
  4776. - Reject relative control socket paths and emit a warning. Previously,
  4777. single-component control socket paths would be rejected, but Tor
  4778. would not log why it could not validate the config. Fixes bug 9258;
  4779. bugfix on 0.2.3.16-alpha.
  4780. o Minor bugfixes (log messages):
  4781. - Fix a bug where clients using bridges would report themselves
  4782. as 50% bootstrapped even without a live consensus document.
  4783. Fixes bug 9922; bugfix on 0.2.1.1-alpha.
  4784. - Suppress a warning where, if there's only one directory authority
  4785. in the network, we would complain that votes and signatures cannot
  4786. be uploaded to other directory authorities. Fixes bug 10842;
  4787. bugfix on 0.2.2.26-beta.
  4788. - Report bootstrapping progress correctly when we're downloading
  4789. microdescriptors. We had updated our "do we have enough microdescs
  4790. to begin building circuits?" logic most recently in 0.2.4.10-alpha
  4791. (see bug 5956), but we left the bootstrap status event logic at
  4792. "how far through getting 1/4 of them are we?" Fixes bug 9958;
  4793. bugfix on 0.2.2.36, which is where they diverged (see bug 5343).
  4794. o Minor bugfixes (logging):
  4795. - Downgrade "Unexpected onionskin length after decryption" warning
  4796. to a protocol-warn, since there's nothing relay operators can do
  4797. about a client that sends them a malformed create cell. Resolves
  4798. bug 12996; bugfix on 0.0.6rc1.
  4799. - Log more specific warnings when we get an ESTABLISH_RENDEZVOUS
  4800. cell on a cannibalized or non-OR circuit. Resolves ticket 12997.
  4801. - When logging information about an EXTEND2 or EXTENDED2 cell, log
  4802. their names correctly. Fixes part of bug 12700; bugfix
  4803. on 0.2.4.8-alpha.
  4804. - When logging information about a relay cell whose command we don't
  4805. recognize, log its command as an integer. Fixes part of bug 12700;
  4806. bugfix on 0.2.1.10-alpha.
  4807. - Escape all strings from the directory connection before logging
  4808. them. Fixes bug 13071; bugfix on 0.1.1.15. Patch from "teor".
  4809. - Squelch a spurious LD_BUG message "No origin circuit for
  4810. successful SOCKS stream" in certain hidden service failure cases;
  4811. fixes bug 10616.
  4812. - Downgrade the severity of the 'unexpected sendme cell from client'
  4813. from 'warn' to 'protocol warning'. Closes ticket 8093.
  4814. o Minor bugfixes (misc code correctness):
  4815. - In munge_extrainfo_into_routerinfo(), check the return value of
  4816. memchr(). This would have been a serious issue if we ever passed
  4817. it a non-extrainfo. Fixes bug 8791; bugfix on 0.2.0.6-alpha. Patch
  4818. from Arlo Breault.
  4819. - On the chance that somebody manages to build Tor on a
  4820. platform where time_t is unsigned, correct the way that
  4821. microdesc_add_to_cache() handles negative time arguments.
  4822. Fixes bug 8042; bugfix on 0.2.3.1-alpha.
  4823. - Fix various instances of undefined behavior in channeltls.c,
  4824. tor_memmem(), and eventdns.c that would cause us to construct
  4825. pointers to memory outside an allocated object. (These invalid
  4826. pointers were not accessed, but C does not even allow them to
  4827. exist.) Fixes bug 10363; bugfixes on 0.1.1.1-alpha, 0.1.2.1-alpha,
  4828. 0.2.0.10-alpha, and 0.2.3.6-alpha. Reported by "bobnomnom".
  4829. - Use the AddressSanitizer and Ubsan sanitizers (in clang-3.4) to
  4830. fix some miscellaneous errors in our tests and codebase. Fixes bug
  4831. 11232. Bugfixes on versions back as far as 0.2.1.11-alpha.
  4832. - Always check return values for unlink, munmap, UnmapViewOfFile;
  4833. check strftime return values more often. In some cases all we can
  4834. do is report a warning, but this may help prevent deeper bugs from
  4835. going unnoticed. Closes ticket 8787; bugfixes on many, many tor
  4836. versions.
  4837. - Fix numerous warnings from the clang "scan-build" static analyzer.
  4838. Some of these are programming style issues; some of them are false
  4839. positives that indicated awkward code; some are undefined behavior
  4840. cases related to constructing (but not using) invalid pointers;
  4841. some are assumptions about API behavior; some are (harmlessly)
  4842. logging sizeof(ptr) bytes from a token when sizeof(*ptr) would be
  4843. correct; and one or two are genuine bugs that weren't reachable
  4844. from the rest of the program. Fixes bug 8793; bugfixes on many,
  4845. many tor versions.
  4846. o Minor bugfixes (node selection):
  4847. - If ExcludeNodes is set, consider non-excluded hidden service
  4848. directory servers before excluded ones. Do not consider excluded
  4849. hidden service directory servers at all if StrictNodes is
  4850. set. (Previously, we would sometimes decide to connect to those
  4851. servers, and then realize before we initiated a connection that
  4852. we had excluded them.) Fixes bug 10722; bugfix on 0.2.0.10-alpha.
  4853. Reported by "mr-4".
  4854. - If we set the ExitNodes option but it doesn't include any nodes
  4855. that have the Exit flag, we would choose not to bootstrap. Now we
  4856. bootstrap so long as ExitNodes includes nodes which can exit to
  4857. some port. Fixes bug 10543; bugfix on 0.2.4.10-alpha.
  4858. o Minor bugfixes (performance):
  4859. - Avoid a bug where every successful connection made us recompute
  4860. the flag telling us whether we have sufficient information to
  4861. build circuits. Previously, we would forget our cached value
  4862. whenever we successfully opened a channel (or marked a router as
  4863. running or not running for any other reason), regardless of
  4864. whether we had previously believed the router to be running. This
  4865. forced us to run an expensive update operation far too often.
  4866. Fixes bug 12170; bugfix on 0.1.2.1-alpha.
  4867. - Avoid using tor_memeq() for checking relay cell integrity. This
  4868. removes a possible performance bottleneck. Fixes part of bug
  4869. 12169; bugfix on 0.2.1.31.
  4870. o Minor bugfixes (platform-specific):
  4871. - When dumping a malformed directory object to disk, save it in
  4872. binary mode on Windows, not text mode. Fixes bug 11342; bugfix on
  4873. 0.2.2.1-alpha.
  4874. - Don't report failures from make_socket_reuseable() on incoming
  4875. sockets on OSX: this can happen when incoming connections close
  4876. early. Fixes bug 10081.
  4877. o Minor bugfixes (pluggable transports):
  4878. - Avoid another 60-second delay when starting Tor in a pluggable-
  4879. transport-using configuration when we already have cached
  4880. descriptors for our bridges. Fixes bug 11965; bugfix
  4881. on 0.2.3.6-alpha.
  4882. o Minor bugfixes (protocol correctness):
  4883. - When receiving a VERSIONS cell with an odd number of bytes, close
  4884. the connection immediately since the cell is malformed. Fixes bug
  4885. 10365; bugfix on 0.2.0.10-alpha. Spotted by "bobnomnom"; fix by
  4886. "rl1987".
  4887. o Minor bugfixes (relay, other):
  4888. - We now drop CREATE cells for already-existent circuit IDs and for
  4889. zero-valued circuit IDs, regardless of other factors that might
  4890. otherwise have called for DESTROY cells. Fixes bug 12191; bugfix
  4891. on 0.0.8pre1.
  4892. - When rejecting DATA cells for stream_id zero, still count them
  4893. against the circuit's deliver window so that we don't fail to send
  4894. a SENDME. Fixes bug 11246; bugfix on 0.2.4.10-alpha.
  4895. o Minor bugfixes (relay, threading):
  4896. - Check return code on spawn_func() in cpuworker code, so that we
  4897. don't think we've spawned a nonworking cpuworker and write junk to
  4898. it forever. Fix related to bug 4345; bugfix on all released Tor
  4899. versions. Found by "skruffy".
  4900. - Use a pthread_attr to make sure that spawn_func() cannot return an
  4901. error while at the same time launching a thread. Fix related to
  4902. bug 4345; bugfix on all released Tor versions. Reported
  4903. by "cypherpunks".
  4904. o Minor bugfixes (relays and bridges):
  4905. - Avoid crashing on a malformed resolv.conf file when running a
  4906. relay using Libevent 1. Fixes bug 8788; bugfix on 0.1.1.23.
  4907. - Non-exit relays no longer launch mock DNS requests to check for
  4908. DNS hijacking. This has been unnecessary since 0.2.1.7-alpha, when
  4909. non-exit relays stopped servicing DNS requests. Fixes bug 965;
  4910. bugfix on 0.2.1.7-alpha. Patch from Matt Pagan.
  4911. - Bridges now report complete directory request statistics. Related
  4912. to bug 5824; bugfix on 0.2.2.1-alpha.
  4913. - Bridges now never collect statistics that were designed for
  4914. relays. Fixes bug 5824; bugfix on 0.2.3.8-alpha.
  4915. o Minor bugfixes (testing):
  4916. - Fix all valgrind warnings produced by the unit tests. There were
  4917. over a thousand memory leak warnings previously, mostly produced
  4918. by forgetting to free things in the unit test code. Fixes bug
  4919. 11618, bugfixes on many versions of Tor.
  4920. o Minor bugfixes (tor-fw-helper):
  4921. - Give a correct log message when tor-fw-helper fails to launch.
  4922. (Previously, we would say something like "tor-fw-helper sent us a
  4923. string we could not parse".) Fixes bug 9781; bugfix
  4924. on 0.2.4.2-alpha.
  4925. o Minor bugfixes (trivial memory leaks):
  4926. - Fix a small memory leak when signing a directory object. Fixes bug
  4927. 11275; bugfix on 0.2.4.13-alpha.
  4928. - Resolve some memory leaks found by coverity in the unit tests, on
  4929. exit in tor-gencert, and on a failure to compute digests for our
  4930. own keys when generating a v3 networkstatus vote. These leaks
  4931. should never have affected anyone in practice.
  4932. o Code simplification and refactoring:
  4933. - Remove some old fallback code designed to keep Tor clients working
  4934. in a network with only two working relays. Elsewhere in the code we
  4935. have long since stopped supporting such networks, so there wasn't
  4936. much point in keeping it around. Addresses ticket 9926.
  4937. - Reject 0-length EXTEND2 cells more explicitly. Fixes bug 10536;
  4938. bugfix on 0.2.4.8-alpha. Reported by "cypherpunks".
  4939. - Extract the common duplicated code for creating a subdirectory
  4940. of the data directory and writing to a file in it. Fixes ticket
  4941. 4282; patch from Peter Retzlaff.
  4942. - Since OpenSSL 0.9.7, the i2d_*() functions support allocating output
  4943. buffer. Avoid calling twice: i2d_RSAPublicKey(), i2d_DHparams(),
  4944. i2d_X509(), and i2d_PublicKey(). Resolves ticket 5170.
  4945. - Add a set of accessor functions for the circuit timeout data
  4946. structure. Fixes ticket 6153; patch from "piet".
  4947. - Clean up exit paths from connection_listener_new(). Closes ticket
  4948. 8789. Patch from Arlo Breault.
  4949. - Since we rely on OpenSSL 0.9.8 now, we can use EVP_PKEY_cmp()
  4950. and drop our own custom pkey_eq() implementation. Fixes bug 9043.
  4951. - Use a doubly-linked list to implement the global circuit list.
  4952. Resolves ticket 9108. Patch from Marek Majkowski.
  4953. - Remove contrib/id_to_fp.c since it wasn't used anywhere.
  4954. - Remove constants and tests for PKCS1 padding; it's insecure and
  4955. shouldn't be used for anything new. Fixes bug 8792; patch
  4956. from Arlo Breault.
  4957. - Remove instances of strcpy() from the unit tests. They weren't
  4958. hurting anything, since they were only in the unit tests, but it's
  4959. embarassing to have strcpy() in the code at all, and some analysis
  4960. tools don't like it. Fixes bug 8790; bugfix on 0.2.3.6-alpha and
  4961. 0.2.3.8-alpha. Patch from Arlo Breault.
  4962. - Remove is_internal_IP() function. Resolves ticket 4645.
  4963. - Remove unused function circuit_dump_by_chan from circuitlist.c.
  4964. Closes issue 9107; patch from "marek".
  4965. - Change our use of the ENUM_BF macro to avoid declarations that
  4966. confuse Doxygen.
  4967. - Get rid of router->address, since in all cases it was just the
  4968. string representation of router->addr. Resolves ticket 5528.
  4969. o Documentation:
  4970. - Adjust the URLs in the README to refer to the new locations of
  4971. several documents on the website. Fixes bug 12830. Patch from
  4972. Matt Pagan.
  4973. - Document 'reject6' and 'accept6' ExitPolicy entries. Resolves
  4974. ticket 12878.
  4975. - Update manpage to describe some of the files you can expect to
  4976. find in Tor's DataDirectory. Addresses ticket 9839.
  4977. - Clean up several option names in the manpage to match their real
  4978. names, add the missing documentation for a couple of testing and
  4979. directory authority options, remove the documentation for a
  4980. V2-directory fetching option that no longer exists. Resolves
  4981. ticket 11634.
  4982. - Correct the documenation so that it lists the correct directory
  4983. for the stats files. (They are in a subdirectory called "stats",
  4984. not "status".)
  4985. - In the manpage, move more authority-only options into the
  4986. directory authority section so that operators of regular directory
  4987. caches don't get confused.
  4988. - Fix the layout of the SOCKSPort flags in the manpage. Fixes bug
  4989. 11061; bugfix on 0.2.4.7-alpha.
  4990. - Resolve warnings from Doxygen.
  4991. - Document in the manpage that "KBytes" may also be written as
  4992. "kilobytes" or "KB", that "Kbits" may also be written as
  4993. "kilobits", and so forth. Closes ticket 9222.
  4994. - Document that the ClientOnly config option overrides ORPort.
  4995. Our old explanation made ClientOnly sound as though it did
  4996. nothing at all. Resolves bug 9059.
  4997. - Explain that SocksPolicy, DirPolicy, and similar options don't
  4998. take port arguments. Fixes the other part of ticket 11108.
  4999. - Fix a comment about the rend_server_descriptor_t.protocols field
  5000. to more accurately describe its range. Also, make that field
  5001. unsigned, to more accurately reflect its usage. Fixes bug 9099;
  5002. bugfix on 0.2.1.5-alpha.
  5003. - Fix the manpage's description of HiddenServiceAuthorizeClient:
  5004. the maximum client name length is 16, not 19. Fixes bug 11118;
  5005. bugfix on 0.2.1.6-alpha.
  5006. o Package cleanup:
  5007. - The contrib directory has been sorted and tidied. Before, it was
  5008. an unsorted dumping ground for useful and not-so-useful things.
  5009. Now, it is divided based on functionality, and the items which
  5010. seemed to be nonfunctional or useless have been removed. Resolves
  5011. ticket 8966; based on patches from "rl1987".
  5012. o Removed code and features:
  5013. - Clients now reject any directory authority certificates lacking
  5014. a dir-key-crosscert element. These have been included since
  5015. 0.2.1.9-alpha, so there's no real reason for them to be optional
  5016. any longer. Completes proposal 157. Resolves ticket 10162.
  5017. - Remove all code that existed to support the v2 directory system,
  5018. since there are no longer any v2 directory authorities. Resolves
  5019. ticket 10758.
  5020. - Remove the HSAuthoritativeDir and AlternateHSAuthority torrc
  5021. options, which were used for designating authorities as "Hidden
  5022. service authorities". There has been no use of hidden service
  5023. authorities since 0.2.2.1-alpha, when we stopped uploading or
  5024. downloading v0 hidden service descriptors. Fixes bug 10881; also
  5025. part of a fix for bug 10841.
  5026. - Remove /tor/dbg-stability.txt URL that was meant to help debug WFU
  5027. and MTBF calculations, but that nobody was using. Fixes bug 11742.
  5028. - The TunnelDirConns and PreferTunnelledDirConns options no longer
  5029. exist; tunneled directory connections have been available since
  5030. 0.1.2.5-alpha, and turning them off is not a good idea. This is a
  5031. brute-force fix for 10849, where "TunnelDirConns 0" would break
  5032. hidden services.
  5033. - Remove all code for the long unused v1 directory protocol.
  5034. Resolves ticket 11070.
  5035. - Remove all remaining code related to version-0 hidden service
  5036. descriptors: they have not been in use since 0.2.2.1-alpha. Fixes
  5037. the rest of bug 10841.
  5038. - Remove migration code from when we renamed the "cached-routers"
  5039. file to "cached-descriptors" back in 0.2.0.8-alpha. This
  5040. incidentally resolves ticket 6502 by cleaning up the related code
  5041. a bit. Patch from Akshay Hebbar.
  5042. o Test infrastructure:
  5043. - Tor now builds each source file in two modes: a mode that avoids
  5044. exposing identifiers needlessly, and another mode that exposes
  5045. more identifiers for testing. This lets the compiler do better at
  5046. optimizing the production code, while enabling us to take more
  5047. radical measures to let the unit tests test things.
  5048. - The production builds no longer include functions used only in
  5049. the unit tests; all functions exposed from a module only for
  5050. unit-testing are now static in production builds.
  5051. - Add an --enable-coverage configuration option to make the unit
  5052. tests (and a new src/or/tor-cov target) to build with gcov test
  5053. coverage support.
  5054. - Update to the latest version of tinytest.
  5055. - Improve the tinytest implementation of string operation tests so
  5056. that comparisons with NULL strings no longer crash the tests; they
  5057. now just fail, normally. Fixes bug 9004; bugfix on 0.2.2.4-alpha.
  5058. - New macros in test.h to simplify writing mock-functions for unit
  5059. tests. Part of ticket 11507. Patch from Dana Koch.
  5060. - We now have rudimentary function mocking support that our unit
  5061. tests can use to test functions in isolation. Function mocking
  5062. lets the tests temporarily replace a function's dependencies with
  5063. stub functions, so that the tests can check the function without
  5064. invoking the other functions it calls.
  5065. o Testing:
  5066. - Complete tests for the status.c module. Resolves ticket 11507.
  5067. Patch from Dana Koch.
  5068. - Add more unit tests for the <circid,channel>->circuit map, and
  5069. the destroy-cell-tracking code to fix bug 7912.
  5070. - Unit tests for failing cases of the TAP onion handshake.
  5071. - More unit tests for address-manipulation functions.
  5072. o Distribution (systemd):
  5073. - Include a tor.service file in contrib/dist for use with systemd.
  5074. Some distributions will be able to use this file unmodified;
  5075. others will need to tweak it, or write their own. Patch from Jamie
  5076. Nguyen; resolves ticket 8368.
  5077. - Verify configuration file via ExecStartPre in the systemd unit
  5078. file. Patch from intrigeri; resolves ticket 12730.
  5079. - Explicitly disable RunAsDaemon in the systemd unit file. Our
  5080. current systemd unit uses "Type = simple", so systemd does not
  5081. expect tor to fork. If the user has "RunAsDaemon 1" in their
  5082. torrc, then things won't work as expected. This is e.g. the case
  5083. on Debian (and derivatives), since there we pass "--defaults-torrc
  5084. /usr/share/tor/tor-service-defaults-torrc" (that contains
  5085. "RunAsDaemon 1") by default. Patch by intrigeri; resolves
  5086. ticket 12731.
  5087. Changes in version 0.2.4.25 - 2014-10-20
  5088. Tor 0.2.4.25 disables SSL3 in response to the recent "POODLE" attack
  5089. (even though POODLE does not affect Tor). It also works around a crash
  5090. bug caused by some operating systems' response to the "POODLE" attack
  5091. (which does affect Tor).
  5092. o Major security fixes (also in 0.2.5.9-rc):
  5093. - Disable support for SSLv3. All versions of OpenSSL in use with Tor
  5094. today support TLS 1.0 or later, so we can safely turn off support
  5095. for this old (and insecure) protocol. Fixes bug 13426.
  5096. o Major bugfixes (openssl bug workaround, also in 0.2.5.9-rc):
  5097. - Avoid crashing when using OpenSSL version 0.9.8zc, 1.0.0o, or
  5098. 1.0.1j, built with the 'no-ssl3' configuration option. Fixes bug
  5099. 13471. This is a workaround for an OpenSSL bug.
  5100. Changes in version 0.2.4.24 - 2014-09-22
  5101. Tor 0.2.4.24 fixes a bug that affects consistency and speed when
  5102. connecting to hidden services, and it updates the location of one of
  5103. the directory authorities.
  5104. o Major bugfixes:
  5105. - Clients now send the correct address for their chosen rendezvous
  5106. point when trying to access a hidden service. They used to send
  5107. the wrong address, which would still work some of the time because
  5108. they also sent the identity digest of the rendezvous point, and if
  5109. the hidden service happened to try connecting to the rendezvous
  5110. point from a relay that already had a connection open to it,
  5111. the relay would reuse that connection. Now connections to hidden
  5112. services should be more robust and faster. Also, this bug meant
  5113. that clients were leaking to the hidden service whether they were
  5114. on a little-endian (common) or big-endian (rare) system, which for
  5115. some users might have reduced their anonymity. Fixes bug 13151;
  5116. bugfix on 0.2.1.5-alpha.
  5117. o Directory authority changes:
  5118. - Change IP address for gabelmoo (v3 directory authority).
  5119. o Minor features (geoip):
  5120. - Update geoip and geoip6 to the August 7 2014 Maxmind GeoLite2
  5121. Country database.
  5122. Changes in version 0.2.4.23 - 2014-07-28
  5123. Tor 0.2.4.23 brings us a big step closer to slowing down the risk from
  5124. guard rotation, and also backports several important fixes from the
  5125. Tor 0.2.5 alpha release series.
  5126. o Major features:
  5127. - Clients now look at the "usecreatefast" consensus parameter to
  5128. decide whether to use CREATE_FAST or CREATE cells for the first hop
  5129. of their circuit. This approach can improve security on connections
  5130. where Tor's circuit handshake is stronger than the available TLS
  5131. connection security levels, but the tradeoff is more computational
  5132. load on guard relays. Implements proposal 221. Resolves ticket 9386.
  5133. - Make the number of entry guards configurable via a new
  5134. NumEntryGuards consensus parameter, and the number of directory
  5135. guards configurable via a new NumDirectoryGuards consensus
  5136. parameter. Implements ticket 12688.
  5137. o Major bugfixes:
  5138. - Fix a bug in the bounds-checking in the 32-bit curve25519-donna
  5139. implementation that caused incorrect results on 32-bit
  5140. implementations when certain malformed inputs were used along with
  5141. a small class of private ntor keys. This bug does not currently
  5142. appear to allow an attacker to learn private keys or impersonate a
  5143. Tor server, but it could provide a means to distinguish 32-bit Tor
  5144. implementations from 64-bit Tor implementations. Fixes bug 12694;
  5145. bugfix on 0.2.4.8-alpha. Bug found by Robert Ransom; fix from
  5146. Adam Langley.
  5147. o Minor bugfixes:
  5148. - Warn and drop the circuit if we receive an inbound 'relay early'
  5149. cell. Those used to be normal to receive on hidden service circuits
  5150. due to bug 1038, but the buggy Tor versions are long gone from
  5151. the network so we can afford to resume watching for them. Resolves
  5152. the rest of bug 1038; bugfix on 0.2.1.19.
  5153. - Correct a confusing error message when trying to extend a circuit
  5154. via the control protocol but we don't know a descriptor or
  5155. microdescriptor for one of the specified relays. Fixes bug 12718;
  5156. bugfix on 0.2.3.1-alpha.
  5157. - Avoid an illegal read from stack when initializing the TLS
  5158. module using a version of OpenSSL without all of the ciphers
  5159. used by the v2 link handshake. Fixes bug 12227; bugfix on
  5160. 0.2.4.8-alpha. Found by "starlight".
  5161. o Minor features:
  5162. - Update geoip and geoip6 to the July 10 2014 Maxmind GeoLite2
  5163. Country database.
  5164. Changes in version 0.2.4.22 - 2014-05-16
  5165. Tor 0.2.4.22 backports numerous high-priority fixes from the Tor 0.2.5
  5166. alpha release series. These include blocking all authority signing
  5167. keys that may have been affected by the OpenSSL "heartbleed" bug,
  5168. choosing a far more secure set of TLS ciphersuites by default, closing
  5169. a couple of memory leaks that could be used to run a target relay out
  5170. of RAM, and several others.
  5171. o Major features (security, backport from 0.2.5.4-alpha):
  5172. - Block authority signing keys that were used on authorities
  5173. vulnerable to the "heartbleed" bug in OpenSSL (CVE-2014-0160). (We
  5174. don't have any evidence that these keys _were_ compromised; we're
  5175. doing this to be prudent.) Resolves ticket 11464.
  5176. o Major bugfixes (security, OOM):
  5177. - Fix a memory leak that could occur if a microdescriptor parse
  5178. fails during the tokenizing step. This bug could enable a memory
  5179. exhaustion attack by directory servers. Fixes bug 11649; bugfix
  5180. on 0.2.2.6-alpha.
  5181. o Major bugfixes (TLS cipher selection, backport from 0.2.5.4-alpha):
  5182. - The relay ciphersuite list is now generated automatically based on
  5183. uniform criteria, and includes all OpenSSL ciphersuites with
  5184. acceptable strength and forward secrecy. Previously, we had left
  5185. some perfectly fine ciphersuites unsupported due to omission or
  5186. typo. Resolves bugs 11513, 11492, 11498, 11499. Bugs reported by
  5187. 'cypherpunks'. Bugfix on 0.2.4.8-alpha.
  5188. - Relays now trust themselves to have a better view than clients of
  5189. which TLS ciphersuites are better than others. (Thanks to bug
  5190. 11513, the relay list is now well-considered, whereas the client
  5191. list has been chosen mainly for anti-fingerprinting purposes.)
  5192. Relays prefer: AES over 3DES; then ECDHE over DHE; then GCM over
  5193. CBC; then SHA384 over SHA256 over SHA1; and last, AES256 over
  5194. AES128. Resolves ticket 11528.
  5195. - Clients now try to advertise the same list of ciphersuites as
  5196. Firefox 28. This change enables selection of (fast) GCM
  5197. ciphersuites, disables some strange old ciphers, and stops
  5198. advertising the ECDH (not to be confused with ECDHE) ciphersuites.
  5199. Resolves ticket 11438.
  5200. o Minor bugfixes (configuration, security):
  5201. - When running a hidden service, do not allow TunneledDirConns 0:
  5202. trying to set that option together with a hidden service would
  5203. otherwise prevent the hidden service from running, and also make
  5204. it publish its descriptors directly over HTTP. Fixes bug 10849;
  5205. bugfix on 0.2.1.1-alpha.
  5206. o Minor bugfixes (controller, backport from 0.2.5.4-alpha):
  5207. - Avoid sending a garbage value to the controller when a circuit is
  5208. cannibalized. Fixes bug 11519; bugfix on 0.2.3.11-alpha.
  5209. o Minor bugfixes (exit relay, backport from 0.2.5.4-alpha):
  5210. - Stop leaking memory when we successfully resolve a PTR record.
  5211. Fixes bug 11437; bugfix on 0.2.4.7-alpha.
  5212. o Minor bugfixes (bridge client, backport from 0.2.5.4-alpha):
  5213. - Avoid 60-second delays in the bootstrapping process when Tor is
  5214. launching for a second time while using bridges. Fixes bug 9229;
  5215. bugfix on 0.2.0.3-alpha.
  5216. o Minor bugfixes (relays and bridges, backport from 0.2.5.4-alpha):
  5217. - Give the correct URL in the warning message when trying to run a
  5218. relay on an ancient version of Windows. Fixes bug 9393.
  5219. o Minor bugfixes (compilation):
  5220. - Fix a compilation error when compiling with --disable-curve25519.
  5221. Fixes bug 9700; bugfix on 0.2.4.17-rc.
  5222. o Minor bugfixes:
  5223. - Downgrade the warning severity for the the "md was still
  5224. referenced 1 node(s)" warning. Tor 0.2.5.4-alpha has better code
  5225. for trying to diagnose this bug, and the current warning in
  5226. earlier versions of tor achieves nothing useful. Addresses warning
  5227. from bug 7164.
  5228. o Minor features (log verbosity, backport from 0.2.5.4-alpha):
  5229. - When we run out of usable circuit IDs on a channel, log only one
  5230. warning for the whole channel, and describe how many circuits
  5231. there were on the channel. Fixes part of ticket 11553.
  5232. o Minor features (security, backport from 0.2.5.4-alpha):
  5233. - Decrease the lower limit of MaxMemInCellQueues to 256 MBytes (but
  5234. leave the default at 8GBytes), to better support Raspberry Pi
  5235. users. Fixes bug 9686; bugfix on 0.2.4.14-alpha.
  5236. o Documentation (backport from 0.2.5.4-alpha):
  5237. - Correctly document that we search for a system torrc file before
  5238. looking in ~/.torrc. Fixes documentation side of 9213; bugfix on
  5239. 0.2.3.18-rc.
  5240. Changes in version 0.2.4.21 - 2014-02-28
  5241. Tor 0.2.4.21 further improves security against potential adversaries who
  5242. find breaking 1024-bit crypto doable, and backports several stability
  5243. and robustness patches from the 0.2.5 branch.
  5244. o Major features (client security):
  5245. - When we choose a path for a 3-hop circuit, make sure it contains
  5246. at least one relay that supports the NTor circuit extension
  5247. handshake. Otherwise, there is a chance that we're building
  5248. a circuit that's worth attacking by an adversary who finds
  5249. breaking 1024-bit crypto doable, and that chance changes the game
  5250. theory. Implements ticket 9777.
  5251. o Major bugfixes:
  5252. - Do not treat streams that fail with reason
  5253. END_STREAM_REASON_INTERNAL as indicating a definite circuit failure,
  5254. since it could also indicate an ENETUNREACH connection error. Fixes
  5255. part of bug 10777; bugfix on 0.2.4.8-alpha.
  5256. o Code simplification and refactoring:
  5257. - Remove data structures which were introduced to implement the
  5258. CellStatistics option: they are now redundant with the new timestamp
  5259. field in the regular packed_cell_t data structure, which we did
  5260. in 0.2.4.18-rc in order to resolve bug 9093. Resolves ticket 10870.
  5261. o Minor features:
  5262. - Always clear OpenSSL bignums before freeing them -- even bignums
  5263. that don't contain secrets. Resolves ticket 10793. Patch by
  5264. Florent Daigniere.
  5265. - Build without warnings under clang 3.4. (We have some macros that
  5266. define static functions only some of which will get used later in
  5267. the module. Starting with clang 3.4, these give a warning unless the
  5268. unused attribute is set on them.) Resolves ticket 10904.
  5269. - Update geoip and geoip6 files to the February 7 2014 Maxmind
  5270. GeoLite2 Country database.
  5271. o Minor bugfixes:
  5272. - Set the listen() backlog limit to the largest actually supported
  5273. on the system, not to the value in a header file. Fixes bug 9716;
  5274. bugfix on every released Tor.
  5275. - Treat ENETUNREACH, EACCES, and EPERM connection failures at an
  5276. exit node as a NOROUTE error, not an INTERNAL error, since they
  5277. can apparently happen when trying to connect to the wrong sort
  5278. of netblocks. Fixes part of bug 10777; bugfix on 0.1.0.1-rc.
  5279. - Fix build warnings about missing "a2x" comment when building the
  5280. manpages from scratch on OpenBSD; OpenBSD calls it "a2x.py".
  5281. Fixes bug 10929; bugfix on 0.2.2.9-alpha. Patch from Dana Koch.
  5282. - Avoid a segfault on SIGUSR1, where we had freed a connection but did
  5283. not entirely remove it from the connection lists. Fixes bug 9602;
  5284. bugfix on 0.2.4.4-alpha.
  5285. - Fix a segmentation fault in our benchmark code when running with
  5286. Fedora's OpenSSL package, or any other OpenSSL that provides
  5287. ECDH but not P224. Fixes bug 10835; bugfix on 0.2.4.8-alpha.
  5288. - Turn "circuit handshake stats since last time" log messages into a
  5289. heartbeat message. Fixes bug 10485; bugfix on 0.2.4.17-rc.
  5290. o Documentation fixes:
  5291. - Document that all but one DirPort entry must have the NoAdvertise
  5292. flag set. Fixes bug 10470; bugfix on 0.2.3.3-alpha / 0.2.3.16-alpha.
  5293. Changes in version 0.2.4.20 - 2013-12-22
  5294. Tor 0.2.4.20 fixes potentially poor random number generation for users
  5295. who 1) use OpenSSL 1.0.0 or later, 2) set "HardwareAccel 1" in their
  5296. torrc file, 3) have "Sandy Bridge" or "Ivy Bridge" Intel processors,
  5297. and 4) have no state file in their DataDirectory (as would happen on
  5298. first start). Users who generated relay or hidden service identity
  5299. keys in such a situation should discard them and generate new ones.
  5300. This release also fixes a logic error that caused Tor clients to build
  5301. many more preemptive circuits than they actually need.
  5302. o Major bugfixes:
  5303. - Do not allow OpenSSL engines to replace the PRNG, even when
  5304. HardwareAccel is set. The only default builtin PRNG engine uses
  5305. the Intel RDRAND instruction to replace the entire PRNG, and
  5306. ignores all attempts to seed it with more entropy. That's
  5307. cryptographically stupid: the right response to a new alleged
  5308. entropy source is never to discard all previously used entropy
  5309. sources. Fixes bug 10402; works around behavior introduced in
  5310. OpenSSL 1.0.0. Diagnosis and investigation thanks to "coderman"
  5311. and "rl1987".
  5312. - Fix assertion failure when AutomapHostsOnResolve yields an IPv6
  5313. address. Fixes bug 10465; bugfix on 0.2.4.7-alpha.
  5314. - Avoid launching spurious extra circuits when a stream is pending.
  5315. This fixes a bug where any circuit that _wasn't_ unusable for new
  5316. streams would be treated as if it were, causing extra circuits to
  5317. be launched. Fixes bug 10456; bugfix on 0.2.4.12-alpha.
  5318. o Minor bugfixes:
  5319. - Avoid a crash bug when starting with a corrupted microdescriptor
  5320. cache file. Fixes bug 10406; bugfix on 0.2.2.6-alpha.
  5321. - If we fail to dump a previously cached microdescriptor to disk, avoid
  5322. freeing duplicate data later on. Fixes bug 10423; bugfix on
  5323. 0.2.4.13-alpha. Spotted by "bobnomnom".
  5324. Changes in version 0.2.4.19 - 2013-12-11
  5325. The Tor 0.2.4 release series is dedicated to the memory of Aaron Swartz
  5326. (1986-2013). Aaron worked on diverse projects including helping to guide
  5327. Creative Commons, playing a key role in stopping SOPA/PIPA, bringing
  5328. transparency to the U.S government's PACER documents, and contributing
  5329. design and development for Tor and Tor2Web. Aaron was one of the latest
  5330. martyrs in our collective fight for civil liberties and human rights,
  5331. and his death is all the more painful because he was one of us.
  5332. Tor 0.2.4.19, the first stable release in the 0.2.4 branch, features
  5333. a new circuit handshake and link encryption that use ECC to provide
  5334. better security and efficiency; makes relays better manage circuit
  5335. creation requests; uses "directory guards" to reduce client enumeration
  5336. risks; makes bridges collect and report statistics about the pluggable
  5337. transports they support; cleans up and improves our geoip database;
  5338. gets much closer to IPv6 support for clients, bridges, and relays; makes
  5339. directory authorities use measured bandwidths rather than advertised
  5340. ones when computing flags and thresholds; disables client-side DNS
  5341. caching to reduce tracking risks; and fixes a big bug in bridge
  5342. reachability testing. This release introduces two new design
  5343. abstractions in the code: a new "channel" abstraction between circuits
  5344. and or_connections to allow for implementing alternate relay-to-relay
  5345. transports, and a new "circuitmux" abstraction storing the queue of
  5346. circuits for a channel. The release also includes many stability,
  5347. security, and privacy fixes.
  5348. o Major features (new circuit handshake):
  5349. - Tor now supports a new circuit extension handshake designed by Ian
  5350. Goldberg, Douglas Stebila, and Berkant Ustaoglu. Our original
  5351. circuit extension handshake, later called "TAP", was a bit slow
  5352. (especially on the relay side), had a fragile security proof, and
  5353. used weaker keys than we'd now prefer. The new circuit handshake
  5354. uses Dan Bernstein's "curve25519" elliptic-curve Diffie-Hellman
  5355. function, making it significantly more secure than the older
  5356. handshake, and significantly faster. Tor can use one of two built-in
  5357. pure-C curve25519-donna implementations by Adam Langley, or it
  5358. can link against the "nacl" library for a tuned version if present.
  5359. The built-in version is very fast for 64-bit systems when building
  5360. with GCC. The built-in 32-bit version is still faster than the
  5361. old TAP protocol, but using libnacl is better on most such hosts.
  5362. Implements proposal 216; closes ticket 7202.
  5363. o Major features (better link encryption):
  5364. - Relays can now enable the ECDHE TLS ciphersuites when available
  5365. and appropriate. These ciphersuites let us negotiate forward-secure
  5366. TLS secret keys more safely and more efficiently than with our
  5367. previous use of Diffie-Hellman modulo a 1024-bit prime. By default,
  5368. public relays prefer the (faster) P224 group, and bridges prefer
  5369. the (more common) P256 group; you can override this with the
  5370. TLSECGroup option.
  5371. This feature requires clients running 0.2.3.17-beta or later,
  5372. and requires both sides to be running OpenSSL 1.0.0 or later
  5373. with ECC support. OpenSSL 1.0.1, with the compile-time option
  5374. "enable-ec_nistp_64_gcc_128", is highly recommended.
  5375. Implements the relay side of proposal 198; closes ticket 7200.
  5376. - Re-enable TLS 1.1 and 1.2 when built with OpenSSL 1.0.1e or later.
  5377. Resolves ticket 6055. (OpenSSL before 1.0.1 didn't have TLS 1.1 or
  5378. 1.2, and OpenSSL from 1.0.1 through 1.0.1d had bugs that prevented
  5379. renegotiation from working with TLS 1.1 or 1.2, so we had disabled
  5380. them to solve bug 6033.)
  5381. o Major features (relay performance):
  5382. - Instead of limiting the number of queued onionskins (aka circuit
  5383. create requests) to a fixed, hard-to-configure number, we limit
  5384. the size of the queue based on how many we expect to be able to
  5385. process in a given amount of time. We estimate the time it will
  5386. take to process an onionskin based on average processing time
  5387. of previous onionskins. Closes ticket 7291. You'll never have to
  5388. configure MaxOnionsPending again.
  5389. - Relays process the new "NTor" circuit-level handshake requests
  5390. with higher priority than the old "TAP" circuit-level handshake
  5391. requests. We still process some TAP requests to not totally starve
  5392. 0.2.3 clients when NTor becomes popular. A new consensus parameter
  5393. "NumNTorsPerTAP" lets us tune the balance later if we need to.
  5394. Implements ticket 9574.
  5395. o Major features (client bootstrapping resilience):
  5396. - Add a new "FallbackDir" torrc option to use when we can't use
  5397. a directory mirror from the consensus (either because we lack a
  5398. consensus, or because they're all down). Currently, all authorities
  5399. are fallbacks by default, and there are no other default fallbacks,
  5400. but that will change. This option will allow us to give clients a
  5401. longer list of servers to try to get a consensus from when first
  5402. connecting to the Tor network, and thereby reduce load on the
  5403. directory authorities. Implements proposal 206, "Preconfigured
  5404. directory sources for bootstrapping". We also removed the old
  5405. "FallbackNetworkstatus" option, since we never got it working well
  5406. enough to use it. Closes bug 572.
  5407. - If we have no circuits open, use a relaxed timeout (the
  5408. 95th-percentile cutoff) until a circuit succeeds. This heuristic
  5409. should allow Tor to succeed at building circuits even when the
  5410. network connection drastically changes. Should help with bug 3443.
  5411. o Major features (use of guards):
  5412. - Support directory guards (proposal 207): when possible, clients now
  5413. use their entry guards for non-anonymous directory requests. This
  5414. can help prevent client enumeration. Note that this behavior only
  5415. works when we have a usable consensus directory, and when options
  5416. about what to download are more or less standard. In the future we
  5417. should re-bootstrap from our guards, rather than re-bootstrapping
  5418. from the preconfigured list of directory sources that ships with
  5419. Tor. Resolves ticket 6526.
  5420. - Raise the default time that a client keeps an entry guard from
  5421. "1-2 months" to "2-3 months", as suggested by Tariq Elahi's WPES
  5422. 2012 paper. (We would make it even longer, but we need better client
  5423. load balancing first.) Also, make the guard lifetime controllable
  5424. via a new GuardLifetime torrc option and a GuardLifetime consensus
  5425. parameter. Start of a fix for bug 8240; bugfix on 0.1.1.11-alpha.
  5426. o Major features (bridges with pluggable transports):
  5427. - Bridges now report the pluggable transports they support to the
  5428. bridge authority, so it can pass the supported transports on to
  5429. bridgedb and/or eventually do reachability testing. Implements
  5430. ticket 3589.
  5431. - Automatically forward the TCP ports of pluggable transport
  5432. proxies using tor-fw-helper if PortForwarding is enabled. Implements
  5433. ticket 4567.
  5434. o Major features (geoip database):
  5435. - Maxmind began labelling Tor relays as being in country "A1",
  5436. which breaks by-country node selection inside Tor. Now we use a
  5437. script to replace "A1" ("Anonymous Proxy") entries in our geoip
  5438. file with real country codes. This script fixes about 90% of "A1"
  5439. entries automatically and uses manual country code assignments to
  5440. fix the remaining 10%. See src/config/README.geoip for details.
  5441. Fixes bug 6266.
  5442. - Add GeoIP database for IPv6 addresses. The new config option
  5443. is GeoIPv6File.
  5444. - Update to the October 2 2013 Maxmind GeoLite Country database.
  5445. o Major features (IPv6):
  5446. - Clients who set "ClientUseIPv6 1" may connect to entry nodes over
  5447. IPv6. Set "ClientPreferIPv6ORPort 1" to make this even more likely
  5448. to happen. Implements ticket 5535.
  5449. - All kind of relays, not just bridges, can now advertise an IPv6
  5450. OR port. Implements ticket 6362.
  5451. - Relays can now exit to IPv6 addresses: make sure that you have IPv6
  5452. connectivity, then set the IPv6Exit flag to 1. Also make sure your
  5453. exit policy reads as you would like: the address * applies to all
  5454. address families, whereas *4 is IPv4 address only, and *6 is IPv6
  5455. addresses only. On the client side, you'll need to wait for enough
  5456. exits to support IPv6, apply the "IPv6Traffic" flag to a SocksPort,
  5457. and use Socks5. Closes ticket 5547, implements proposal 117 as
  5458. revised in proposal 208.
  5459. - Bridge authorities now accept IPv6 bridge addresses and include
  5460. them in network status documents. Implements ticket 5534.
  5461. - Directory authorities vote on IPv6 OR ports. Implements ticket 6363.
  5462. o Major features (directory authorities):
  5463. - Directory authorities now prefer using measured bandwidths to
  5464. advertised ones when computing flags and thresholds. Resolves
  5465. ticket 8273.
  5466. - Directory authorities that vote measured bandwidths about more
  5467. than a threshold number of relays now treat relays with
  5468. unmeasured bandwidths as having bandwidth 0 when computing their
  5469. flags. Resolves ticket 8435.
  5470. - Directory authorities now support a new consensus method (17)
  5471. where they cap the published bandwidth of relays for which
  5472. insufficient bandwidth measurements exist. Fixes part of bug 2286.
  5473. - Directory authorities that set "DisableV2DirectoryInfo_ 1" no longer
  5474. serve any v2 directory information. Now we can test disabling the
  5475. old deprecated v2 directory format, and see whether doing so has
  5476. any effect on network load. Begins to fix bug 6783.
  5477. o Major features (build and portability):
  5478. - Switch to a nonrecursive Makefile structure. Now instead of each
  5479. Makefile.am invoking other Makefile.am's, there is a master
  5480. Makefile.am that includes the others. This change makes our build
  5481. process slightly more maintainable, and improves parallelism for
  5482. building with make -j. Original patch by Stewart Smith; various
  5483. fixes by Jim Meyering.
  5484. - Where available, we now use automake's "silent" make rules by
  5485. default, so that warnings are easier to spot. You can get the old
  5486. behavior with "make V=1". Patch by Stewart Smith for ticket 6522.
  5487. - Resume building correctly with MSVC and Makefile.nmake. This patch
  5488. resolves numerous bugs and fixes reported by ultramage, including
  5489. 7305, 7308, 7309, 7310, 7312, 7313, 7315, 7316, and 7669.
  5490. o Security features:
  5491. - Switch to a completely time-invariant approach for picking nodes
  5492. weighted by bandwidth. Our old approach would run through the
  5493. part of the loop after it had made its choice slightly slower
  5494. than it ran through the part of the loop before it had made its
  5495. choice. Addresses ticket 6538.
  5496. - Disable the use of Guard nodes when in Tor2WebMode. Guard usage
  5497. by tor2web clients allows hidden services to identify tor2web
  5498. clients through their repeated selection of the same rendezvous
  5499. and introduction point circuit endpoints (their guards). Resolves
  5500. ticket 6888.
  5501. o Major bugfixes (relay denial of service):
  5502. - When we have too much memory queued in circuits (according to a new
  5503. MaxMemInCellQueues option), close the circuits that have the oldest
  5504. queued cells, on the theory that those are most responsible for
  5505. us running low on memory. This prevents us from running out of
  5506. memory as a relay if circuits fill up faster than they can be
  5507. drained. Fixes bugs 9063 and 9093; bugfix on the 54th commit of
  5508. Tor. This bug is a further fix beyond bug 6252, whose fix was
  5509. merged into 0.2.3.21-rc.
  5510. - Reject bogus create and relay cells with 0 circuit ID or 0 stream
  5511. ID: these could be used to create unexpected streams and circuits
  5512. which would count as "present" to some parts of Tor but "absent"
  5513. to others, leading to zombie circuits and streams or to a bandwidth
  5514. denial-of-service. Fixes bug 7889; bugfix on every released version
  5515. of Tor. Reported by "oftc_must_be_destroyed".
  5516. - Avoid a bug where our response to TLS renegotiation under certain
  5517. network conditions could lead to a busy-loop, with 100% CPU
  5518. consumption. Fixes bug 5650; bugfix on 0.2.0.16-alpha.
  5519. o Major bugfixes (asserts, crashes, leaks):
  5520. - Prevent the get_freelists() function from running off the end of
  5521. the list of freelists if it somehow gets an unrecognized
  5522. allocation. Fixes bug 8844; bugfix on 0.2.0.16-alpha. Reported by
  5523. eugenis.
  5524. - Avoid a memory leak where we would leak a consensus body when we
  5525. find that a consensus which we couldn't previously verify due to
  5526. missing certificates is now verifiable. Fixes bug 8719; bugfix
  5527. on 0.2.0.10-alpha.
  5528. - If we are unable to save a microdescriptor to the journal, do not
  5529. drop it from memory and then reattempt downloading it. Fixes bug
  5530. 9645; bugfix on 0.2.2.6-alpha.
  5531. - Fix an assertion failure that would occur when disabling the
  5532. ORPort setting on a running Tor process while accounting was
  5533. enabled. Fixes bug 6979; bugfix on 0.2.2.18-alpha.
  5534. - Avoid an assertion failure on OpenBSD (and perhaps other BSDs)
  5535. when an exit connection with optimistic data succeeds immediately
  5536. rather than returning EINPROGRESS. Fixes bug 9017; bugfix on
  5537. 0.2.3.1-alpha.
  5538. - Fix a memory leak that would occur whenever a configuration
  5539. option changed. Fixes bug 8718; bugfix on 0.2.3.3-alpha.
  5540. o Major bugfixes (relay rate limiting):
  5541. - When a TLS write is partially successful but incomplete, remember
  5542. that the flushed part has been flushed, and notice that bytes were
  5543. actually written. Reported and fixed pseudonymously. Fixes bug 7708;
  5544. bugfix on Tor 0.1.0.5-rc.
  5545. - Raise the default BandwidthRate/BandwidthBurst values from 5MB/10MB
  5546. to 1GB/1GB. The previous defaults were intended to be "basically
  5547. infinite", but it turns out they're now limiting our 100mbit+
  5548. relays and bridges. Fixes bug 6605; bugfix on 0.2.0.10-alpha (the
  5549. last time we raised it).
  5550. - No longer stop reading or writing on cpuworker connections when
  5551. our rate limiting buckets go empty. Now we should handle circuit
  5552. handshake requests more promptly. Resolves bug 9731.
  5553. o Major bugfixes (client-side privacy):
  5554. - When we mark a circuit as unusable for new circuits, have it
  5555. continue to be unusable for new circuits even if MaxCircuitDirtiness
  5556. is increased too much at the wrong time, or the system clock jumps
  5557. backwards. Fixes bug 6174; bugfix on 0.0.2pre26.
  5558. - If ClientDNSRejectInternalAddresses ("do not believe DNS queries
  5559. which have resolved to internal addresses") is set, apply that
  5560. rule to IPv6 as well. Fixes bug 8475; bugfix on 0.2.0.7-alpha.
  5561. - When an exit relay rejects a stream with reason "exit policy", but
  5562. we only know an exit policy summary (e.g. from the microdesc
  5563. consensus) for it, do not mark the relay as useless for all exiting.
  5564. Instead, mark just the circuit as unsuitable for that particular
  5565. address. Fixes part of bug 7582; bugfix on 0.2.3.2-alpha.
  5566. o Major bugfixes (stream isolation):
  5567. - Allow applications to get proper stream isolation with
  5568. IsolateSOCKSAuth. Many SOCKS5 clients that want to offer
  5569. username/password authentication also offer "no authentication". Tor
  5570. had previously preferred "no authentication", so the applications
  5571. never actually sent Tor their auth details. Now Tor selects
  5572. username/password authentication if it's offered. You can disable
  5573. this behavior on a per-SOCKSPort basis via PreferSOCKSNoAuth. Fixes
  5574. bug 8117; bugfix on 0.2.3.3-alpha.
  5575. - Follow the socks5 protocol when offering username/password
  5576. authentication. The fix for bug 8117 exposed this bug, and it
  5577. turns out real-world applications like Pidgin do care. Bugfix on
  5578. 0.2.3.2-alpha; fixes bug 8879.
  5579. o Major bugfixes (client circuit building):
  5580. - Alter circuit build timeout measurement to start at the point
  5581. where we begin the CREATE/CREATE_FAST step (as opposed to circuit
  5582. initialization). This should make our timeout measurements more
  5583. uniform. Previously, we were sometimes including ORconn setup time
  5584. in our circuit build time measurements. Should resolve bug 3443.
  5585. - If the circuit build timeout logic is disabled (via the consensus,
  5586. or because we are an authority), then don't build testing circuits.
  5587. Fixes bug 9657; bugfix on 0.2.2.14-alpha.
  5588. o Major bugfixes (client-side DNS):
  5589. - Turn off the client-side DNS cache by default. Updating and using
  5590. the DNS cache is now configurable on a per-client-port
  5591. level. SOCKSPort, DNSPort, etc lines may now contain
  5592. {No,}Cache{IPv4,IPv6,}DNS lines to indicate that we shouldn't
  5593. cache these types of DNS answers when we receive them from an
  5594. exit node in response to an application request on this port, and
  5595. {No,}UseCached{IPv4,IPv6,DNS} lines to indicate that if we have
  5596. cached DNS answers of these types, we shouldn't use them. It's
  5597. potentially risky to use cached DNS answers at the client, since
  5598. doing so can indicate to one exit what answers we've gotten
  5599. for DNS lookups in the past. With IPv6, this becomes especially
  5600. problematic. Using cached DNS answers for requests on the same
  5601. circuit would present less linkability risk, since all traffic
  5602. on a circuit is already linkable, but it would also provide
  5603. little performance benefit: the exit node caches DNS replies
  5604. too. Implements a simplified version of Proposal 205. Implements
  5605. ticket 7570.
  5606. o Major bugfixes (hidden service privacy):
  5607. - Limit hidden service descriptors to at most ten introduction
  5608. points, to slow one kind of guard enumeration. Fixes bug 9002;
  5609. bugfix on 0.1.1.11-alpha.
  5610. o Major bugfixes (directory fetching):
  5611. - If the time to download the next old-style networkstatus is in
  5612. the future, do not decline to consider whether to download the
  5613. next microdescriptor networkstatus. Fixes bug 9564; bugfix on
  5614. 0.2.3.14-alpha.
  5615. - We used to always request authority certificates by identity digest,
  5616. meaning we'd get the newest one even when we wanted one with a
  5617. different signing key. Then we would complain about being given
  5618. a certificate we already had, and never get the one we really
  5619. wanted. Now we use the "fp-sk/" resource as well as the "fp/"
  5620. resource to request the one we want. Fixes bug 5595; bugfix on
  5621. 0.2.0.8-alpha.
  5622. o Major bugfixes (bridge reachability):
  5623. - Bridges now send AUTH_CHALLENGE cells during their v3 handshakes;
  5624. previously they did not, which prevented them from receiving
  5625. successful connections from relays for self-test or bandwidth
  5626. testing. Also, when a relay is extending a circuit to a bridge,
  5627. it needs to send a NETINFO cell, even when the bridge hasn't sent
  5628. an AUTH_CHALLENGE cell. Fixes bug 9546; bugfix on 0.2.3.6-alpha.
  5629. o Major bugfixes (control interface):
  5630. - When receiving a new configuration file via the control port's
  5631. LOADCONF command, do not treat the defaults file as absent.
  5632. Fixes bug 9122; bugfix on 0.2.3.9-alpha.
  5633. o Major bugfixes (directory authorities):
  5634. - Stop marking every relay as having been down for one hour every
  5635. time we restart a directory authority. These artificial downtimes
  5636. were messing with our Stable and Guard flag calculations. Fixes
  5637. bug 8218 (introduced by the fix for 1035). Bugfix on 0.2.2.23-alpha.
  5638. - When computing directory thresholds, ignore any rejected-as-sybil
  5639. nodes during the computation so that they can't influence Fast,
  5640. Guard, etc. (We should have done this for proposal 109.) Fixes
  5641. bug 8146.
  5642. - When marking a node as a likely sybil, reset its uptime metrics
  5643. to zero, so that it cannot time towards getting marked as Guard,
  5644. Stable, or HSDir. (We should have done this for proposal 109.) Fixes
  5645. bug 8147.
  5646. - Fix a bug in the voting algorithm that could yield incorrect results
  5647. when a non-naming authority declared too many flags. Fixes bug 9200;
  5648. bugfix on 0.2.0.3-alpha.
  5649. o Internal abstraction features:
  5650. - Introduce new channel_t abstraction between circuits and
  5651. or_connection_t to allow for implementing alternate OR-to-OR
  5652. transports. A channel_t is an abstract object which can either be a
  5653. cell-bearing channel, which is responsible for authenticating and
  5654. handshaking with the remote OR and transmitting cells to and from
  5655. it, or a listening channel, which spawns new cell-bearing channels
  5656. at the request of remote ORs. Implements part of ticket 6465.
  5657. - Make a channel_tls_t subclass of channel_t, adapting it to the
  5658. existing or_connection_t code. The V2/V3 protocol handshaking
  5659. code which formerly resided in command.c has been moved below the
  5660. channel_t abstraction layer and may be found in channeltls.c now.
  5661. Implements the rest of ticket 6465.
  5662. - Introduce new circuitmux_t storing the queue of circuits for
  5663. a channel; this encapsulates and abstracts the queue logic and
  5664. circuit selection policy, and allows the latter to be overridden
  5665. easily by switching out a policy object. The existing EWMA behavior
  5666. is now implemented as a circuitmux_policy_t. Resolves ticket 6816.
  5667. o New build requirements:
  5668. - Tor now requires OpenSSL 0.9.8 or later. OpenSSL 1.0.0 or later is
  5669. strongly recommended.
  5670. - Tor maintainers now require Automake version 1.9 or later to build
  5671. Tor from the Git repository. (Automake is not required when building
  5672. from a source distribution.)
  5673. o Minor features (protocol):
  5674. - No longer include the "opt" prefix when generating routerinfos
  5675. or v2 directories: it has been needless since Tor 0.1.2. Closes
  5676. ticket 5124.
  5677. - Reject EXTEND cells sent to nonexistent streams. According to the
  5678. spec, an EXTEND cell sent to _any_ nonzero stream ID is invalid, but
  5679. we were only checking for stream IDs that were currently in use.
  5680. Found while hunting for more instances of bug 6271. Bugfix on
  5681. 0.0.2pre8, which introduced incremental circuit construction.
  5682. - Tor relays and clients now support a better CREATE/EXTEND cell
  5683. format, allowing the sender to specify multiple address, identity,
  5684. and handshake types. Implements Robert Ransom's proposal 200;
  5685. closes ticket 7199.
  5686. - Reject as invalid most directory objects containing a NUL.
  5687. Belt-and-suspender fix for bug 8037.
  5688. o Minor features (security):
  5689. - Clear keys and key-derived material left on the stack in
  5690. rendservice.c and rendclient.c. Check return value of
  5691. crypto_pk_write_private_key_to_string() in rend_service_load_keys().
  5692. These fixes should make us more forward-secure against cold-boot
  5693. attacks and the like. Fixes bug 2385.
  5694. - Use our own weak RNG when we need a weak RNG. Windows's rand() and
  5695. Irix's random() only return 15 bits; Solaris's random() returns more
  5696. bits but its RAND_MAX says it only returns 15, and so on. Motivated
  5697. by the fix for bug 7801; bugfix on 0.2.2.20-alpha.
  5698. o Minor features (control protocol):
  5699. - Add a "GETINFO signal/names" control port command. Implements
  5700. ticket 3842.
  5701. - Provide default values for all options via "GETINFO config/defaults".
  5702. Implements ticket 4971.
  5703. - Allow an optional $ before the node identity digest in the
  5704. controller command GETINFO ns/id/<identity>, for consistency with
  5705. md/id/<identity> and desc/id/<identity>. Resolves ticket 7059.
  5706. - Add CACHED keyword to ADDRMAP events in the control protocol
  5707. to indicate whether a DNS result will be cached or not. Resolves
  5708. ticket 8596.
  5709. - Generate bootstrapping status update events correctly when fetching
  5710. microdescriptors. Fixes bug 9927.
  5711. o Minor features (path selection):
  5712. - When deciding whether we have enough descriptors to build circuits,
  5713. instead of looking at raw relay counts, look at which fraction
  5714. of (bandwidth-weighted) paths we're able to build. This approach
  5715. keeps clients from building circuits if their paths are likely to
  5716. stand out statistically. The default fraction of paths needed is
  5717. taken from the consensus directory; you can override it with the
  5718. new PathsNeededToBuildCircuits option. Fixes ticket 5956.
  5719. - When any country code is listed in ExcludeNodes or ExcludeExitNodes,
  5720. and we have GeoIP information, also exclude all nodes with unknown
  5721. countries "??" and "A1". This behavior is controlled by the
  5722. new GeoIPExcludeUnknown option: you can make such nodes always
  5723. excluded with "GeoIPExcludeUnknown 1", and disable the feature
  5724. with "GeoIPExcludeUnknown 0". Setting "GeoIPExcludeUnknown auto"
  5725. gets you the default behavior. Implements feature 7706.
  5726. o Minor features (hidden services):
  5727. - Improve circuit build timeout handling for hidden services.
  5728. In particular: adjust build timeouts more accurately depending
  5729. upon the number of hop-RTTs that a particular circuit type
  5730. undergoes. Additionally, launch intro circuits in parallel
  5731. if they timeout, and take the first one to reply as valid.
  5732. - The Tor client now ignores sub-domain components of a .onion
  5733. address. This change makes HTTP "virtual" hosting
  5734. possible: http://foo.aaaaaaaaaaaaaaaa.onion/ and
  5735. http://bar.aaaaaaaaaaaaaaaa.onion/ can be two different websites
  5736. hosted on the same hidden service. Implements proposal 204.
  5737. - Enable Tor to read configuration, state, and key information from
  5738. a FIFO. Previously Tor would only read from files with a positive
  5739. stat.st_size. Code from meejah; fixes bug 6044.
  5740. o Minor features (clients):
  5741. - Teach bridge-using clients to avoid 0.2.2.x bridges when making
  5742. microdescriptor-related dir requests, and only fall back to normal
  5743. descriptors if none of their bridges can handle microdescriptors
  5744. (as opposed to the fix in ticket 4013, which caused them to fall
  5745. back to normal descriptors if *any* of their bridges preferred
  5746. them). Resolves ticket 4994.
  5747. - Tweak tor-fw-helper to accept an arbitrary amount of arbitrary
  5748. TCP ports to forward. In the past it only accepted two ports:
  5749. the ORPort and the DirPort.
  5750. o Minor features (protecting client timestamps):
  5751. - Clients no longer send timestamps in their NETINFO cells. These were
  5752. not used for anything, and they provided one small way for clients
  5753. to be distinguished from each other as they moved from network to
  5754. network or behind NAT. Implements part of proposal 222.
  5755. - Clients now round timestamps in INTRODUCE cells down to the nearest
  5756. 10 minutes. If a new Support022HiddenServices option is set to 0, or
  5757. if it's set to "auto" and the feature is disabled in the consensus,
  5758. the timestamp is sent as 0 instead. Implements part of proposal 222.
  5759. - Stop sending timestamps in AUTHENTICATE cells. This is not such
  5760. a big deal from a security point of view, but it achieves no actual
  5761. good purpose, and isn't needed. Implements part of proposal 222.
  5762. - Reduce down accuracy of timestamps in hidden service descriptors.
  5763. Implements part of proposal 222.
  5764. o Minor features (bridges):
  5765. - Make bridge relays check once a minute for whether their IP
  5766. address has changed, rather than only every 15 minutes. Resolves
  5767. bugs 1913 and 1992.
  5768. - Bridge statistics now count bridge clients connecting over IPv6:
  5769. bridge statistics files now list "bridge-ip-versions" and
  5770. extra-info documents list "geoip6-db-digest". The control protocol
  5771. "CLIENTS_SEEN" and "ip-to-country" queries now support IPv6. Initial
  5772. implementation by "shkoo", addressing ticket 5055.
  5773. - Add a new torrc option "ServerTransportListenAddr" to let bridge
  5774. operators select the address where their pluggable transports will
  5775. listen for connections. Resolves ticket 7013.
  5776. - Randomize the lifetime of our SSL link certificate, so censors can't
  5777. use the static value for filtering Tor flows. Resolves ticket 8443;
  5778. related to ticket 4014 which was included in 0.2.2.33.
  5779. o Minor features (relays):
  5780. - Option OutboundBindAddress can be specified multiple times and
  5781. accepts IPv6 addresses. Resolves ticket 6876.
  5782. o Minor features (IPv6, client side):
  5783. - AutomapHostsOnResolve now supports IPv6 addresses. By default, we
  5784. prefer to hand out virtual IPv6 addresses, since there are more of
  5785. them and we can't run out. To override this behavior and make IPv4
  5786. addresses preferred, set NoPreferIPv6Automap on whatever SOCKSPort
  5787. or DNSPort you're using for resolving. Implements ticket 7571.
  5788. - AutomapHostsOnResolve responses are now randomized, to avoid
  5789. annoying situations where Tor is restarted and applications
  5790. connect to the wrong addresses.
  5791. - Never try more than 1000 times to pick a new virtual address when
  5792. AutomapHostsOnResolve is set. That's good enough so long as we
  5793. aren't close to handing out our entire virtual address space;
  5794. if you're getting there, it's best to switch to IPv6 virtual
  5795. addresses anyway.
  5796. o Minor features (IPv6, relay/authority side):
  5797. - New config option "AuthDirHasIPv6Connectivity 1" that directory
  5798. authorities should set if they have IPv6 connectivity and want to
  5799. do reachability tests for IPv6 relays. Implements feature 5974.
  5800. - A relay with an IPv6 OR port now sends that address in NETINFO
  5801. cells (in addition to its other address). Implements ticket 6364.
  5802. o Minor features (directory authorities):
  5803. - Directory authorities no long accept descriptors for any version of
  5804. Tor before 0.2.2.35, or for any 0.2.3 release before 0.2.3.10-alpha.
  5805. These versions are insecure, unsupported, or both. Implements
  5806. ticket 6789.
  5807. - When directory authorities are computing thresholds for flags,
  5808. never let the threshold for the Fast flag fall below 4096
  5809. bytes. Also, do not consider nodes with extremely low bandwidths
  5810. when deciding thresholds for various directory flags. This change
  5811. should raise our threshold for Fast relays, possibly in turn
  5812. improving overall network performance; see ticket 1854. Resolves
  5813. ticket 8145.
  5814. - Directory authorities now include inside each vote a statement of
  5815. the performance thresholds they used when assigning flags.
  5816. Implements ticket 8151.
  5817. - Add an "ignoring-advertised-bws" boolean to the flag-threshold lines
  5818. in directory authority votes to describe whether they have enough
  5819. measured bandwidths to ignore advertised (relay descriptor)
  5820. bandwidth claims. Resolves ticket 8711.
  5821. o Minor features (path bias detection):
  5822. - Path Use Bias: Perform separate accounting for successful circuit
  5823. use. Keep separate statistics on stream attempt rates versus stream
  5824. success rates for each guard. Provide configurable thresholds to
  5825. determine when to emit log messages or disable use of guards that
  5826. fail too many stream attempts. Resolves ticket 7802.
  5827. - Create three levels of Path Bias log messages, as opposed to just
  5828. two. These are configurable via consensus as well as via the torrc
  5829. options PathBiasNoticeRate, PathBiasWarnRate, PathBiasExtremeRate.
  5830. The default values are 0.70, 0.50, and 0.30 respectively.
  5831. - Separate the log message levels from the decision to drop guards,
  5832. which also is available via torrc option PathBiasDropGuards.
  5833. PathBiasDropGuards still defaults to 0 (off).
  5834. - Deprecate PathBiasDisableRate in favor of PathBiasDropGuards
  5835. in combination with PathBiasExtremeRate.
  5836. - Increase the default values for PathBiasScaleThreshold and
  5837. PathBiasCircThreshold from (200, 20) to (300, 150).
  5838. - Add in circuit usage accounting to path bias. If we try to use a
  5839. built circuit but fail for any reason, it counts as path bias.
  5840. Certain classes of circuits where the adversary gets to pick your
  5841. destination node are exempt from this accounting. Usage accounting
  5842. can be specifically disabled via consensus parameter or torrc.
  5843. - Convert all internal path bias state to double-precision floating
  5844. point, to avoid roundoff error and other issues.
  5845. - Only record path bias information for circuits that have completed
  5846. *two* hops. Assuming end-to-end tagging is the attack vector, this
  5847. makes us more resilient to ambient circuit failure without any
  5848. detection capability loss.
  5849. o Minor features (build):
  5850. - Tor now builds correctly on Bitrig, an OpenBSD fork. Patch from
  5851. dhill. Resolves ticket 6982.
  5852. - Compile on win64 using mingw64. Fixes bug 7260; patches from
  5853. "yayooo".
  5854. - Work correctly on Unix systems where EAGAIN and EWOULDBLOCK are
  5855. separate error codes; or at least, don't break for that reason.
  5856. Fixes bug 7935. Reported by "oftc_must_be_destroyed".
  5857. o Build improvements (autotools):
  5858. - Warn if building on a platform with an unsigned time_t: there
  5859. are too many places where Tor currently assumes that time_t can
  5860. hold negative values. We'd like to fix them all, but probably
  5861. some will remain.
  5862. - Do not report status verbosely from autogen.sh unless the -v flag
  5863. is specified. Fixes issue 4664. Patch from Onizuka.
  5864. - Detect and reject attempts to build Tor with threading support
  5865. when OpenSSL has been compiled without threading support.
  5866. Fixes bug 6673.
  5867. - Try to detect if we are ever building on a platform where
  5868. memset(...,0,...) does not set the value of a double to 0.0. Such
  5869. platforms are permitted by the C standard, though in practice
  5870. they're pretty rare (since IEEE 754 is nigh-ubiquitous). We don't
  5871. currently support them, but it's better to detect them and fail
  5872. than to perform erroneously.
  5873. - We no longer warn so much when generating manpages from their
  5874. asciidoc source.
  5875. - Use Ville Laurikari's implementation of AX_CHECK_SIGN() to determine
  5876. the signs of types during autoconf. This is better than our old
  5877. approach, which didn't work when cross-compiling.
  5878. o Minor features (log messages, warnings):
  5879. - Detect when we're running with a version of OpenSSL other than the
  5880. one we compiled with. This conflict has occasionally given people
  5881. hard-to-track-down errors.
  5882. - Warn users who run hidden services on a Tor client with
  5883. UseEntryGuards disabled that their hidden services will be
  5884. vulnerable to http://freehaven.net/anonbib/#hs-attack06 (the
  5885. attack which motivated Tor to support entry guards in the first
  5886. place). Resolves ticket 6889.
  5887. - Warn when we are binding low ports when hibernation is enabled;
  5888. previously we had warned when we were _advertising_ low ports with
  5889. hibernation enabled. Fixes bug 7285; bugfix on 0.2.3.9-alpha.
  5890. - Issue a warning when running with the bufferevents backend enabled.
  5891. It's still not stable, and people should know that they're likely
  5892. to hit unexpected problems. Closes ticket 9147.
  5893. o Minor features (log messages, notices):
  5894. - Refactor resolve_my_address() so it returns the method by which we
  5895. decided our public IP address (explicitly configured, resolved from
  5896. explicit hostname, guessed from interfaces, learned by gethostname).
  5897. Now we can provide more helpful log messages when a relay guesses
  5898. its IP address incorrectly (e.g. due to unexpected lines in
  5899. /etc/hosts). Resolves ticket 2267.
  5900. - Track how many "TAP" and "NTor" circuit handshake requests we get,
  5901. and how many we complete, and log it every hour to help relay
  5902. operators follow trends in network load. Addresses ticket 9658.
  5903. o Minor features (log messages, diagnostics):
  5904. - If we fail to free a microdescriptor because of bug 7164, log
  5905. the filename and line number from which we tried to free it.
  5906. - We compute the overhead from passing onionskins back and forth to
  5907. cpuworkers, and report it when dumping statistics in response to
  5908. SIGUSR1. Supports ticket 7291.
  5909. - Add another diagnostic to the heartbeat message: track and log
  5910. overhead that TLS is adding to the data we write. If this is
  5911. high, we are sending too little data to SSL_write at a time.
  5912. Diagnostic for bug 7707.
  5913. - Log packaged cell fullness as part of the heartbeat message.
  5914. Diagnosis to try to determine the extent of bug 7743.
  5915. - Add more detail to a log message about relaxed timeouts, to help
  5916. track bug 7799.
  5917. - When learning a fingerprint for a bridge, log its corresponding
  5918. transport type. Implements ticket 7896.
  5919. - Warn more aggressively when flushing microdescriptors to a
  5920. microdescriptor cache fails, in an attempt to mitigate bug 8031,
  5921. or at least make it more diagnosable.
  5922. - Improve the log message when "Bug/attack: unexpected sendme cell
  5923. from client" occurs, to help us track bug 8093.
  5924. - Improve debugging output to help track down bug 8185 ("Bug:
  5925. outgoing relay cell has n_chan==NULL. Dropping.")
  5926. o Minor features (log messages, quieter bootstrapping):
  5927. - Log fewer lines at level "notice" about our OpenSSL and Libevent
  5928. versions and capabilities when everything is going right. Resolves
  5929. part of ticket 6736.
  5930. - Omit the first heartbeat log message, because it never has anything
  5931. useful to say, and it clutters up the bootstrapping messages.
  5932. Resolves ticket 6758.
  5933. - Don't log about reloading the microdescriptor cache at startup. Our
  5934. bootstrap warnings are supposed to tell the user when there's a
  5935. problem, and our bootstrap notices say when there isn't. Resolves
  5936. ticket 6759; bugfix on 0.2.2.6-alpha.
  5937. - Don't log "I learned some more directory information" when we're
  5938. reading cached directory information. Reserve it for when new
  5939. directory information arrives in response to a fetch. Resolves
  5940. ticket 6760.
  5941. - Don't complain about bootstrapping problems while hibernating.
  5942. These complaints reflect a general code problem, but not one
  5943. with any problematic effects (no connections are actually
  5944. opened). Fixes part of bug 7302; bugfix on 0.2.3.2-alpha.
  5945. o Minor features (testing):
  5946. - In our testsuite, create temporary directories with a bit more
  5947. entropy in their name to make name collisions less likely. Fixes
  5948. bug 8638.
  5949. - Add benchmarks for DH (1024-bit multiplicative group) and ECDH
  5950. (P-256) Diffie-Hellman handshakes to src/or/bench.
  5951. - Add benchmark functions to test onion handshake performance.
  5952. o Renamed options:
  5953. - The DirServer option is now DirAuthority, for consistency with
  5954. current naming patterns. You can still use the old DirServer form.
  5955. o Minor bugfixes (protocol):
  5956. - Fix the handling of a TRUNCATE cell when it arrives while the
  5957. circuit extension is in progress. Fixes bug 7947; bugfix on 0.0.7.1.
  5958. - When a Tor client gets a "truncated" relay cell, the first byte of
  5959. its payload specifies why the circuit was truncated. We were
  5960. ignoring this 'reason' byte when tearing down the circuit, resulting
  5961. in the controller not being told why the circuit closed. Now we
  5962. pass the reason from the truncated cell to the controller. Bugfix
  5963. on 0.1.2.3-alpha; fixes bug 7039.
  5964. - Fix a misframing issue when reading the version numbers in a
  5965. VERSIONS cell. Previously we would recognize [00 01 00 02] as
  5966. 'version 1, version 2, and version 0x100', when it should have
  5967. only included versions 1 and 2. Fixes bug 8059; bugfix on
  5968. 0.2.0.10-alpha. Reported pseudonymously.
  5969. - Make the format and order of STREAM events for DNS lookups
  5970. consistent among the various ways to launch DNS lookups. Fixes
  5971. bug 8203; bugfix on 0.2.0.24-rc. Patch by "Desoxy".
  5972. o Minor bugfixes (syscalls and disk interaction):
  5973. - Always check the return values of functions fcntl() and
  5974. setsockopt(). We don't believe these are ever actually failing in
  5975. practice, but better safe than sorry. Also, checking these return
  5976. values should please analysis tools like Coverity. Patch from
  5977. 'flupzor'. Fixes bug 8206; bugfix on all versions of Tor.
  5978. - Avoid double-closing the listener socket in our socketpair()
  5979. replacement (used on Windows) in the case where the addresses on
  5980. our opened sockets don't match what we expected. Fixes bug 9400;
  5981. bugfix on 0.0.2pre7. Found by Coverity.
  5982. - Correctly store microdescriptors and extrainfo descriptors that
  5983. include an internal NUL byte. Fixes bug 8037; bugfix on
  5984. 0.2.0.1-alpha. Bug reported by "cypherpunks".
  5985. - If for some reason we fail to write a microdescriptor while
  5986. rebuilding the cache, do not let the annotations from that
  5987. microdescriptor linger in the cache file, and do not let the
  5988. microdescriptor stay recorded as present in its old location.
  5989. Fixes bug 9047; bugfix on 0.2.2.6-alpha.
  5990. - Use direct writes rather than stdio when building microdescriptor
  5991. caches, in an attempt to mitigate bug 8031, or at least make it
  5992. less common.
  5993. o Minor fixes (config options):
  5994. - Warn and fail if a server is configured not to advertise any
  5995. ORPorts at all. (We need *something* to put in our descriptor,
  5996. or we just won't work.)
  5997. - Behave correctly when the user disables LearnCircuitBuildTimeout
  5998. but doesn't tell us what they would like the timeout to be. Fixes
  5999. bug 6304; bugfix on 0.2.2.14-alpha.
  6000. - Rename the (internal-use-only) UsingTestingNetworkDefaults option
  6001. to start with a triple-underscore so the controller won't touch it.
  6002. Patch by Meejah. Fixes bug 3155. Bugfix on 0.2.2.23-alpha.
  6003. - Rename the (testing-use-only) _UseFilteringSSLBufferevents option
  6004. so it doesn't start with _. Fixes bug 3155. Bugfix on 0.2.3.1-alpha.
  6005. - When autodetecting the number of CPUs, use the number of available
  6006. CPUs in preference to the number of configured CPUs. Inform the
  6007. user if this reduces the number of available CPUs. Fixes bug 8002;
  6008. bugfix on 0.2.3.1-alpha.
  6009. - Command-line option "--version" implies "--quiet". Fixes bug 6997.
  6010. - Make it an error when you set EntryNodes but disable UseGuardNodes,
  6011. since it will (surprisingly to some users) ignore EntryNodes. Fixes
  6012. bug 8180; bugfix on 0.2.3.11-alpha.
  6013. - Avoid overflows when the user sets MaxCircuitDirtiness to a
  6014. ridiculously high value, by imposing a (ridiculously high) 30-day
  6015. maximum on MaxCircuitDirtiness.
  6016. o Minor bugfixes (control protocol):
  6017. - Stop sending a stray "(null)" in some cases for the server status
  6018. "EXTERNAL_ADDRESS" controller event. Resolves bug 8200; bugfix
  6019. on 0.1.2.6-alpha.
  6020. - The ADDRMAP command can no longer generate an ill-formed error
  6021. code on a failed MAPADDRESS. It now says "internal" rather than
  6022. an English sentence fragment with spaces in the middle. Bugfix on
  6023. Tor 0.2.0.19-alpha.
  6024. o Minor bugfixes (clients / edges):
  6025. - When we receive a RELAY_END cell with the reason DONE, or with no
  6026. reason, before receiving a RELAY_CONNECTED cell, report the SOCKS
  6027. status as "connection refused". Previously we reported these cases
  6028. as success but then immediately closed the connection. Fixes bug
  6029. 7902; bugfix on 0.1.0.1-rc. Reported by "oftc_must_be_destroyed".
  6030. - If the guard we choose first doesn't answer, we would try the
  6031. second guard, but once we connected to the second guard we would
  6032. abandon it and retry the first one, slowing down bootstrapping.
  6033. The fix is to treat all our initially chosen guards as acceptable
  6034. to use. Fixes bug 9946; bugfix on 0.1.1.11-alpha.
  6035. - When choosing which stream on a formerly stalled circuit to wake
  6036. first, make better use of the platform's weak RNG. Previously,
  6037. we had been using the % ("modulo") operator to try to generate a
  6038. 1/N chance of picking each stream, but this behaves badly with
  6039. many platforms' choice of weak RNG. Fixes bug 7801; bugfix on
  6040. 0.2.2.20-alpha.
  6041. o Minor bugfixes (path bias detection):
  6042. - If the state file's path bias counts are invalid (presumably from a
  6043. buggy Tor prior to 0.2.4.10-alpha), make them correct. Also add
  6044. additional checks and log messages to the scaling of Path Bias
  6045. counts, in case there still are remaining issues with scaling.
  6046. Should help resolve bug 8235.
  6047. - Prevent rounding error in path bias counts when scaling
  6048. them down, and use the correct scale factor default. Also demote
  6049. some path bias related log messages down a level and make others
  6050. less scary sounding. Fixes bug 6647. Bugfix on 0.2.3.17-beta.
  6051. - Remove a source of rounding error during path bias count scaling;
  6052. don't count cannibalized circuits as used for path bias until we
  6053. actually try to use them; and fix a circuit_package_relay_cell()
  6054. warning message about n_chan==NULL. Fixes bug 7802.
  6055. - Paste the description for PathBias parameters from the man
  6056. page into or.h, so the code documents them too. Fixes bug 7982;
  6057. bugfix on 0.2.3.17-beta.
  6058. o Minor bugfixes (relays):
  6059. - Stop trying to resolve our hostname so often (e.g. every time we
  6060. think about doing a directory fetch). Now we reuse the cached
  6061. answer in some cases. Fixes bugs 1992 (bugfix on 0.2.0.20-rc)
  6062. and 2410 (bugfix on 0.1.2.2-alpha).
  6063. - When examining the list of network interfaces to find our address,
  6064. do not consider non-running or disabled network interfaces. Fixes
  6065. bug 9904; bugfix on 0.2.3.11-alpha. Patch from "hantwister".
  6066. o Minor bugfixes (blocking resistance):
  6067. - Only disable TLS session ticket support when running as a TLS
  6068. server. Now clients will blend better with regular Firefox
  6069. connections. Fixes bug 7189; bugfix on Tor 0.2.3.23-rc.
  6070. o Minor bugfixes (IPv6):
  6071. - Use square brackets around IPv6 addresses in numerous places
  6072. that needed them, including log messages, HTTPS CONNECT proxy
  6073. requests, TransportProxy statefile entries, and pluggable transport
  6074. extra-info lines. Fixes bug 7011; patch by David Fifield.
  6075. o Minor bugfixes (directory authorities):
  6076. - Reject consensus votes with more than 64 known-flags. We aren't even
  6077. close to that limit yet, and our code doesn't handle it correctly.
  6078. Fixes bug 6833; bugfix on 0.2.0.1-alpha.
  6079. - Correctly handle votes with more than 31 flags. Fixes bug 6853;
  6080. bugfix on 0.2.0.3-alpha.
  6081. o Minor bugfixes (memory leaks):
  6082. - Avoid leaking memory if we fail to compute a consensus signature
  6083. or we generate a consensus we can't parse. Bugfix on 0.2.0.5-alpha.
  6084. - Fix a memory leak when receiving headers from an HTTPS proxy. Bugfix
  6085. on 0.2.1.1-alpha; fixes bug 7816.
  6086. - Fix a memory leak during safe-cookie controller authentication.
  6087. Bugfix on 0.2.3.13-alpha; fixes bug 7816.
  6088. - Free some more still-in-use memory at exit, to make hunting for
  6089. memory leaks easier. Resolves bug 7029.
  6090. o Minor bugfixes (code correctness):
  6091. - Increase the width of the field used to remember a connection's
  6092. link protocol version to two bytes. Harmless for now, since the
  6093. only currently recognized versions are one byte long. Reported
  6094. pseudonymously. Fixes bug 8062; bugfix on 0.2.0.10-alpha.
  6095. - Fix a crash when debugging unit tests on Windows: deallocate a
  6096. shared library with FreeLibrary, not CloseHandle. Fixes bug 7306;
  6097. bugfix on 0.2.2.17-alpha. Reported by "ultramage".
  6098. - When detecting the largest possible file descriptor (in order to
  6099. close all file descriptors when launching a new program), actually
  6100. use _SC_OPEN_MAX. The old code for doing this was very, very broken.
  6101. Fixes bug 8209; bugfix on 0.2.3.1-alpha. Found by Coverity; this
  6102. is CID 743383.
  6103. - Avoid a crash if we fail to generate an extrainfo descriptor.
  6104. Fixes bug 8208; bugfix on 0.2.3.16-alpha. Found by Coverity;
  6105. this is CID 718634.
  6106. - Avoid an off-by-one error when checking buffer boundaries when
  6107. formatting the exit status of a pluggable transport helper.
  6108. This is probably not an exploitable bug, but better safe than
  6109. sorry. Fixes bug 9928; bugfix on 0.2.3.18-rc. Bug found by
  6110. Pedro Ribeiro.
  6111. - Get rid of a couple of harmless clang warnings, where we compared
  6112. enums to ints. These warnings are newly introduced in clang 3.2.
  6113. o Minor bugfixes (code cleanliness):
  6114. - Avoid use of reserved identifiers in our C code. The C standard
  6115. doesn't like us declaring anything that starts with an
  6116. underscore, so let's knock it off before we get in trouble. Fix
  6117. for bug 1031; bugfix on the first Tor commit.
  6118. - Fix round_to_power_of_2() so it doesn't invoke undefined behavior
  6119. with large values. This situation was untriggered, but nevertheless
  6120. incorrect. Fixes bug 6831; bugfix on 0.2.0.1-alpha.
  6121. - Fix an impossible buffer overrun in the AES unit tests. Fixes
  6122. bug 8845; bugfix on 0.2.0.7-alpha. Found by eugenis.
  6123. - Fix handling of rendezvous client authorization types over 8.
  6124. Fixes bug 6861; bugfix on 0.2.1.5-alpha.
  6125. - Remove a couple of extraneous semicolons that were upsetting the
  6126. cparser library. Patch by Christian Grothoff. Fixes bug 7115;
  6127. bugfix on 0.2.2.1-alpha.
  6128. - When complaining about a client port on a public address, log
  6129. which address we're complaining about. Fixes bug 4020; bugfix on
  6130. 0.2.3.3-alpha. Patch by Tom Fitzhenry.
  6131. o Minor bugfixes (log messages, warnings):
  6132. - If we encounter a write failure on a SOCKS connection before we
  6133. finish our SOCKS handshake, don't warn that we closed the
  6134. connection before we could send a SOCKS reply. Fixes bug 8427;
  6135. bugfix on 0.1.0.1-rc.
  6136. - Fix a directory authority warn caused when we have a large amount
  6137. of badexit bandwidth. Fixes bug 8419; bugfix on 0.2.2.10-alpha.
  6138. - Downgrade "Failed to hand off onionskin" messages to "debug"
  6139. severity, since they're typically redundant with the "Your computer
  6140. is too slow" messages. Fixes bug 7038; bugfix on 0.2.2.16-alpha.
  6141. - Avoid spurious warnings when configuring multiple client ports of
  6142. which only some are nonlocal. Previously, we had claimed that some
  6143. were nonlocal when in fact they weren't. Fixes bug 7836; bugfix on
  6144. 0.2.3.3-alpha.
  6145. o Minor bugfixes (log messages, other):
  6146. - Fix log messages and comments to avoid saying "GMT" when we mean
  6147. "UTC". Fixes bug 6113.
  6148. - When rejecting a configuration because we were unable to parse a
  6149. quoted string, log an actual error message. Fixes bug 7950; bugfix
  6150. on 0.2.0.16-alpha.
  6151. - Correctly recognize that [::1] is a loopback address. Fixes
  6152. bug 8377; bugfix on 0.2.1.3-alpha.
  6153. - Don't log inappropriate heartbeat messages when hibernating: a
  6154. hibernating node is _expected_ to drop out of the consensus,
  6155. decide it isn't bootstrapped, and so forth. Fixes bug 7302;
  6156. bugfix on 0.2.3.1-alpha.
  6157. - Eliminate several instances where we use "Nickname=ID" to refer to
  6158. nodes in logs. Use "Nickname (ID)" instead. (Elsewhere, we still use
  6159. "$ID=Nickname", which is also acceptable.) Fixes bug 7065. Bugfix
  6160. on 0.2.3.21-rc.
  6161. o Minor bugfixes (build):
  6162. - Fix some bugs in tor-fw-helper-natpmp when trying to build and
  6163. run it on Windows. More bugs likely remain. Patch from Gisle Vanem.
  6164. Fixes bug 7280; bugfix on 0.2.3.1-alpha.
  6165. o Documentation fixes:
  6166. - Make the torify manpage no longer refer to tsocks; torify hasn't
  6167. supported tsocks since 0.2.3.14-alpha.
  6168. - Make the tor manpage no longer reference tsocks.
  6169. - Fix the GeoIPExcludeUnknown documentation to refer to
  6170. ExcludeExitNodes rather than the currently nonexistent
  6171. ExcludeEntryNodes. Spotted by "hamahangi" on tor-talk.
  6172. - Resolve a typo in torrc.sample.in. Fixes bug 6819; bugfix on
  6173. 0.2.3.14-alpha.
  6174. - Say "KBytes" rather than "KB" in the man page (for various values
  6175. of K), to further reduce confusion about whether Tor counts in
  6176. units of memory or fractions of units of memory. Resolves ticket 7054.
  6177. - Update tor-fw-helper.1.txt and tor-fw-helper.c to make option
  6178. names match. Fixes bug 7768.
  6179. - Fix the documentation of HeartbeatPeriod to say that the heartbeat
  6180. message is logged at notice, not at info.
  6181. - Clarify the usage and risks of setting the ContactInfo torrc line
  6182. for your relay or bridge. Resolves ticket 9854.
  6183. - Add anchors to the manpage so we can link to the html version of
  6184. the documentation for specific options. Resolves ticket 9866.
  6185. - Replace remaining references to DirServer in man page and
  6186. log entries. Resolves ticket 10124.
  6187. o Removed features:
  6188. - Stop exporting estimates of v2 and v3 directory traffic shares
  6189. in extrainfo documents. They were unneeded and sometimes inaccurate.
  6190. Also stop exporting any v2 directory request statistics. Resolves
  6191. ticket 5823.
  6192. - Drop support for detecting and warning about versions of Libevent
  6193. before 1.3e. Nothing reasonable ships with them any longer; warning
  6194. the user about them shouldn't be needed. Resolves ticket 6826.
  6195. - Now that all versions before 0.2.2.x are disallowed, we no longer
  6196. need to work around their missing features. Remove a bunch of
  6197. compatibility code.
  6198. o Removed files:
  6199. - The tor-tsocks.conf is no longer distributed or installed. We
  6200. recommend that tsocks users use torsocks instead. Resolves
  6201. ticket 8290.
  6202. - Remove some of the older contents of doc/ as obsolete; move others
  6203. to torspec.git. Fixes bug 8965.
  6204. o Code simplification:
  6205. - Avoid using character buffers when constructing most directory
  6206. objects: this approach was unwieldy and error-prone. Instead,
  6207. build smartlists of strings, and concatenate them when done.
  6208. - Rename "isin" functions to "contains", for grammar. Resolves
  6209. ticket 5285.
  6210. - Rename Tor's logging function log() to tor_log(), to avoid conflicts
  6211. with the natural logarithm function from the system libm. Resolves
  6212. ticket 7599.
  6213. - Start using OpenBSD's implementation of queue.h, so that we don't
  6214. need to hand-roll our own pointer and list structures whenever we
  6215. need them. (We can't rely on a sys/queue.h, since some operating
  6216. systems don't have them, and the ones that do have them don't all
  6217. present the same extensions.)
  6218. - Start using OpenBSD's implementation of queue.h (originally by
  6219. Niels Provos).
  6220. - Enhance our internal sscanf replacement so that we can eliminate
  6221. the last remaining uses of the system sscanf. (Though those uses
  6222. of sscanf were safe, sscanf itself is generally error prone, so
  6223. we want to eliminate when we can.) Fixes ticket 4195 and Coverity
  6224. CID 448.
  6225. - Replace all calls to snprintf() outside of src/ext with
  6226. tor_snprintf(). Also remove the #define to replace snprintf with
  6227. _snprintf on Windows; they have different semantics, and all of
  6228. our callers should be using tor_snprintf() anyway. Fixes bug 7304.
  6229. o Refactoring:
  6230. - Add a wrapper function for the common "log a message with a
  6231. rate-limit" case.
  6232. - Split the onion.c file into separate modules for the onion queue
  6233. and the different handshakes it supports.
  6234. - Move the client-side address-map/virtual-address/DNS-cache code
  6235. out of connection_edge.c into a new addressmap.c module.
  6236. - Move the entry node code from circuitbuild.c to its own file.
  6237. - Move the circuit build timeout tracking code from circuitbuild.c
  6238. to its own file.
  6239. - Source files taken from other packages now reside in src/ext;
  6240. previously they were scattered around the rest of Tor.
  6241. - Move the generic "config" code into a new file, and have "config.c"
  6242. hold only torrc- and state-related code. Resolves ticket 6823.
  6243. - Move the core of our "choose a weighted element at random" logic
  6244. into its own function, and give it unit tests. Now the logic is
  6245. testable, and a little less fragile too.
  6246. - Move ipv6_preferred from routerinfo_t to node_t. Addresses bug 4620.
  6247. - Move last_reachable and testing_since from routerinfo_t to node_t.
  6248. Implements ticket 5529.
  6249. - Add replaycache_t structure, functions and unit tests, then refactor
  6250. rend_service_introduce() to be more clear to read, improve, debug,
  6251. and test. Resolves bug 6177.
  6252. o Removed code:
  6253. - Remove some now-needless code that tried to aggressively flush
  6254. OR connections as data was added to them. Since 0.2.0.1-alpha, our
  6255. cell queue logic has saved us from the failure mode that this code
  6256. was supposed to prevent. Removing this code will limit the number
  6257. of baroque control flow paths through Tor's network logic. Reported
  6258. pseudonymously on IRC. Fixes bug 6468; bugfix on 0.2.0.1-alpha.
  6259. - Remove unused code for parsing v1 directories and "running routers"
  6260. documents. Fixes bug 6887.
  6261. - Remove the marshalling/unmarshalling code for sending requests to
  6262. cpuworkers over a socket, and instead just send structs. The
  6263. recipient will always be the same Tor binary as the sender, so
  6264. any encoding is overkill.
  6265. - Remove the testing_since field of node_t, which hasn't been used
  6266. for anything since 0.2.0.9-alpha.
  6267. - Finally remove support for malloc_good_size and malloc_usable_size.
  6268. We had hoped that these functions would let us eke a little more
  6269. memory out of our malloc implementation. Unfortunately, the only
  6270. implementations that provided these functions are also ones that
  6271. are already efficient about not overallocation: they never got us
  6272. more than 7 or so bytes per allocation. Removing them saves us a
  6273. little code complexity and a nontrivial amount of build complexity.
  6274. Changes in version 0.2.3.25 - 2012-11-19
  6275. The Tor 0.2.3 release series is dedicated to the memory of Len "rabbi"
  6276. Sassaman (1980-2011), a long-time cypherpunk, anonymity researcher,
  6277. Mixmaster maintainer, Pynchon Gate co-designer, CodeCon organizer,
  6278. programmer, and friend. Unstinting in his dedication to the cause of
  6279. freedom, he inspired and helped many of us as we began our work on
  6280. anonymity, and inspires us still. Please honor his memory by writing
  6281. software to protect people's freedoms, and by helping others to do so.
  6282. Tor 0.2.3.25, the first stable release in the 0.2.3 branch, features
  6283. significantly reduced directory overhead (via microdescriptors),
  6284. enormous crypto performance improvements for fast relays on new
  6285. enough hardware, a new v3 TLS handshake protocol that can better
  6286. resist fingerprinting, support for protocol obfuscation plugins (aka
  6287. pluggable transports), better scalability for hidden services, IPv6
  6288. support for bridges, performance improvements like allowing clients
  6289. to skip the first round-trip on the circuit ("optimistic data") and
  6290. refilling token buckets more often, a new "stream isolation" design
  6291. to isolate different applications on different circuits, and many
  6292. stability, security, and privacy fixes.
  6293. Major features (v3 directory protocol):
  6294. - Clients now use microdescriptors instead of regular descriptors
  6295. to build circuits. Microdescriptors are authority-generated
  6296. summaries of regular descriptors' contents, designed to change very
  6297. rarely (see proposal 158 for details). This feature is designed
  6298. to save bandwidth, especially for clients on slow internet
  6299. connections. Use "UseMicrodescriptors 0" to disable it.
  6300. - Caches now download, cache, and serve microdescriptors, as well
  6301. as multiple "flavors" of the consensus, including a flavor that
  6302. describes microdescriptors.
  6303. o Major features (build hardening):
  6304. - Enable gcc and ld hardening by default. Resolves ticket 5210.
  6305. o Major features (relay scaling):
  6306. - When built to use OpenSSL 1.0.1, and built for an x86 or x86_64
  6307. instruction set, take advantage of OpenSSL's AESNI, bitsliced, or
  6308. vectorized AES implementations as appropriate. These can be much,
  6309. much faster than other AES implementations.
  6310. - When using OpenSSL 1.0.0 or later, use OpenSSL's counter mode
  6311. implementation. It makes AES_CTR about 7% faster than our old one
  6312. (which was about 10% faster than the one OpenSSL used to provide).
  6313. Resolves ticket 4526.
  6314. - Use OpenSSL's EVP interface for AES encryption, so that all AES
  6315. operations can use hardware acceleration (if present). Resolves
  6316. ticket 4442.
  6317. - Unconditionally use OpenSSL's AES implementation instead of our
  6318. old built-in one. OpenSSL's AES has been better for a while, and
  6319. relatively few servers should still be on any version of OpenSSL
  6320. that doesn't have good optimized assembly AES.
  6321. o Major features (blocking resistance):
  6322. - Update TLS cipher list to match Firefox 8 and later. Resolves
  6323. ticket 4744.
  6324. - Remove support for clients falsely claiming to support standard
  6325. ciphersuites that they can actually provide. As of modern OpenSSL
  6326. versions, it's not necessary to fake any standard ciphersuite,
  6327. and doing so prevents us from using better ciphersuites in the
  6328. future, since servers can't know whether an advertised ciphersuite
  6329. is really supported or not. Some hosts -- notably, ones with very
  6330. old versions of OpenSSL or where OpenSSL has been built with ECC
  6331. disabled -- will stand out because of this change; TBB users should
  6332. not be affected. Implements the client side of proposal 198.
  6333. - Implement a new handshake protocol (v3) for authenticating Tors to
  6334. each other over TLS. It should be more resistant to fingerprinting
  6335. than previous protocols, and should require less TLS hacking for
  6336. future Tor implementations. Implements proposal 176.
  6337. - Allow variable-length padding cells, to disguise the length of
  6338. Tor's TLS records. Implements part of proposal 184.
  6339. - While we're trying to bootstrap, record how many TLS connections
  6340. fail in each state, and report which states saw the most failures
  6341. in response to any bootstrap failures. This feature may speed up
  6342. diagnosis of censorship events. Implements ticket 3116.
  6343. o Major features (pluggable transports):
  6344. - Clients and bridges can now be configured to use a separate
  6345. "transport" proxy. This approach makes the censorship arms race
  6346. easier by allowing bridges to use protocol obfuscation plugins.
  6347. Implements proposal 180 (tickets 2841 and 3472).
  6348. o Major features (DoS resistance):
  6349. - Now that Tor 0.2.0.x is completely deprecated, enable the final
  6350. part of "Proposal 110: Avoiding infinite length circuits" by
  6351. refusing all circuit-extend requests that do not use a relay_early
  6352. cell. This change helps Tor resist a class of denial-of-service
  6353. attacks by limiting the maximum circuit length.
  6354. - Tear down the circuit if we get an unexpected SENDME cell. Clients
  6355. could use this trick to make their circuits receive cells faster
  6356. than our flow control would have allowed, or to gum up the network,
  6357. or possibly to do targeted memory denial-of-service attacks on
  6358. entry nodes. Fixes bug 6252. Bugfix on the 54th commit on Tor --
  6359. from July 2002, before the release of Tor 0.0.0.
  6360. o Major features (hidden services):
  6361. - Adjust the number of introduction points that a hidden service
  6362. will try to maintain based on how long its introduction points
  6363. remain in use and how many introductions they handle. Fixes
  6364. part of bug 3825.
  6365. - Add a "tor2web mode" for clients that want to connect to hidden
  6366. services non-anonymously (and possibly more quickly). As a safety
  6367. measure to try to keep users from turning this on without knowing
  6368. what they are doing, tor2web mode must be explicitly enabled at
  6369. compile time, and a copy of Tor compiled to run in tor2web mode
  6370. cannot be used as a normal Tor client. Implements feature 2553.
  6371. o Major features (IPv6):
  6372. - Clients can now connect to private bridges over IPv6. Bridges
  6373. still need at least one IPv4 address in order to connect to
  6374. other relays. Note that we don't yet handle the case where the
  6375. user has two bridge lines for the same bridge (one IPv4, one
  6376. IPv6). Implements parts of proposal 186.
  6377. o Major features (directory authorities):
  6378. - Use a more secure consensus parameter voting algorithm. Now at
  6379. least three directory authorities or a majority of them must
  6380. vote on a given parameter before it will be included in the
  6381. consensus. Implements proposal 178.
  6382. - Remove the artificially low cutoff of 20KB to guarantee the Fast
  6383. flag. In the past few years the average relay speed has picked
  6384. up, and while the "top 7/8 of the network get the Fast flag" and
  6385. "all relays with 20KB or more of capacity get the Fast flag" rules
  6386. used to have the same result, now the top 7/8 of the network has
  6387. a capacity more like 32KB. Bugfix on 0.2.1.14-rc. Fixes bug 4489.
  6388. o Major features (performance):
  6389. - Exit nodes now accept and queue data on not-yet-connected streams.
  6390. Previously, the client wasn't allowed to send data until the
  6391. stream was connected, which slowed down all connections. This
  6392. change will enable clients to perform a "fast-start" on streams
  6393. and send data without having to wait for a confirmation that the
  6394. stream has opened. Patch from Ian Goldberg; implements the server
  6395. side of Proposal 174.
  6396. - When using an exit relay running 0.2.3.x, clients can now
  6397. "optimistically" send data before the exit relay reports that
  6398. the stream has opened. This saves a round trip when starting
  6399. connections where the client speaks first (such as web browsing).
  6400. This behavior is controlled by a consensus parameter (currently
  6401. disabled). To turn it on or off manually, use the "OptimisticData"
  6402. torrc option. Implements proposal 181; code by Ian Goldberg.
  6403. - Add a new TokenBucketRefillInterval option to refill token buckets
  6404. more frequently than once per second. This should improve network
  6405. performance, alleviate queueing problems, and make traffic less
  6406. bursty. Implements proposal 183; closes ticket 3630. Design by
  6407. Florian Tschorsch and Björn Scheuermann; implementation by
  6408. Florian Tschorsch.
  6409. - Raise the threshold of server descriptors needed (75%) and exit
  6410. server descriptors needed (50%) before we will declare ourselves
  6411. bootstrapped. This will make clients start building circuits a
  6412. little later, but makes the initially constructed circuits less
  6413. skewed and less in conflict with further directory fetches. Fixes
  6414. ticket 3196.
  6415. o Major features (relays):
  6416. - Relays now try regenerating and uploading their descriptor more
  6417. frequently if they are not listed in the consensus, or if the
  6418. version of their descriptor listed in the consensus is too
  6419. old. This fix should prevent situations where a server declines
  6420. to re-publish itself because it has done so too recently, even
  6421. though the authorities decided not to list its recent-enough
  6422. descriptor. Fix for bug 3327.
  6423. o Major features (stream isolation):
  6424. - You can now configure Tor so that streams from different
  6425. applications are isolated on different circuits, to prevent an
  6426. attacker who sees your streams as they leave an exit node from
  6427. linking your sessions to one another. To do this, choose some way
  6428. to distinguish the applications: have them connect to different
  6429. SocksPorts, or have one of them use SOCKS4 while the other uses
  6430. SOCKS5, or have them pass different authentication strings to the
  6431. SOCKS proxy. Then, use the new SocksPort syntax to configure the
  6432. degree of isolation you need. This implements Proposal 171.
  6433. - There's a new syntax for specifying multiple client ports (such as
  6434. SOCKSPort, TransPort, DNSPort, NATDPort): you can now just declare
  6435. multiple *Port entries with full addr:port syntax on each.
  6436. The old *ListenAddress format is still supported, but you can't
  6437. mix it with the new *Port syntax.
  6438. o Major features (bufferevents):
  6439. - Tor can now optionally build with the "bufferevents" buffered IO
  6440. backend provided by Libevent 2. To use this feature, make sure you
  6441. have the latest possible version of Libevent, and pass the
  6442. --enable-bufferevents flag to configure when building Tor from
  6443. source. This feature will make our networking code more flexible,
  6444. let us stack layers on each other, and let us use more efficient
  6445. zero-copy transports where available.
  6446. - Add experimental support for running on Windows with IOCP and no
  6447. kernel-space socket buffers. This feature is controlled by a new
  6448. "UserspaceIOCPBuffers" config option (off by default), which has
  6449. no effect unless Tor has been built with bufferevents enabled,
  6450. you're running on Windows, and you've set "DisableIOCP 0". In the
  6451. long run, this may help solve or mitigate bug 98.
  6452. o Major features (path selection):
  6453. - The EntryNodes option can now include country codes like {de} or IP
  6454. addresses or network masks. Previously we had disallowed these
  6455. options because we didn't have an efficient way to keep the list up
  6456. to date. Addresses ticket 1982, but see bug 2798 for an unresolved
  6457. issue here.
  6458. o Major features (port forwarding):
  6459. - Add support for automatic port mapping on the many home routers
  6460. that support NAT-PMP or UPnP. To build the support code, you'll
  6461. need to have the libnatpnp library and/or the libminiupnpc library,
  6462. and you'll need to enable the feature specifically by passing
  6463. "--enable-upnp" and/or "--enable-natpnp" to ./configure. To turn
  6464. it on, use the new PortForwarding option.
  6465. o Major features (logging):
  6466. - Add a new 'Heartbeat' log message type to periodically log a message
  6467. describing Tor's status at level Notice. This feature is meant for
  6468. operators who log at notice, and want to make sure that their Tor
  6469. server is still working. Implementation by George Kadianakis.
  6470. - Make logging resolution configurable with a new LogTimeGranularity
  6471. option, and change the default from 1 millisecond to 1 second.
  6472. Implements enhancement 1668.
  6473. o Major features (other):
  6474. - New "DisableNetwork" config option to prevent Tor from launching any
  6475. connections or accepting any connections except on a control port.
  6476. Bundles and controllers can set this option before letting Tor talk
  6477. to the rest of the network, for example to prevent any connections
  6478. to a non-bridge address. Packages like Orbot can also use this
  6479. option to instruct Tor to save power when the network is off.
  6480. - Try to use system facilities for enumerating local interface
  6481. addresses, before falling back to our old approach (which was
  6482. binding a UDP socket, and calling getsockname() on it). That
  6483. approach was scaring OS X users whose draconian firewall
  6484. software warned about binding to UDP sockets regardless of
  6485. whether packets were sent. Now we try to use getifaddrs(),
  6486. SIOCGIFCONF, or GetAdaptersAddresses(), depending on what the
  6487. system supports. Resolves ticket 1827.
  6488. - Add experimental support for a "defaults" torrc file to be parsed
  6489. before the regular torrc. Torrc options override the defaults file's
  6490. options in the same way that the command line overrides the torrc.
  6491. The SAVECONF controller command saves only those options which
  6492. differ between the current configuration and the defaults file. HUP
  6493. reloads both files. Implements task 4552.
  6494. o New directory authorities:
  6495. - Add Faravahar (run by Sina Rabbani) as the ninth v3 directory
  6496. authority. Closes ticket 5749.
  6497. o Security/privacy fixes:
  6498. - Avoid read-from-freed-memory and double-free bugs that could occur
  6499. when a DNS request fails while launching it. Fixes bug 6480;
  6500. bugfix on 0.2.0.1-alpha.
  6501. - Reject any attempt to extend to an internal address. Without
  6502. this fix, a router could be used to probe addresses on an internal
  6503. network to see whether they were accepting connections. Fixes bug
  6504. 6710; bugfix on 0.0.8pre1.
  6505. - Close any connection that sends unrecognized junk before the TLS
  6506. handshake. Solves an issue noted in bug 4369.
  6507. - The advertised platform of a relay now includes only its operating
  6508. system's name (e.g., "Linux", "Darwin", "Windows 7"), and not
  6509. its service pack level (for Windows) or its CPU architecture
  6510. (for Unix). Also drop the "git-XYZ" tag in the version. Packagers
  6511. can insert an extra string in the platform line by setting the
  6512. preprocessor variable TOR_BUILD_TAG. Resolves bug 2988.
  6513. - Disable TLS session tickets. OpenSSL's implementation was giving
  6514. our TLS session keys the lifetime of our TLS context objects, when
  6515. perfect forward secrecy would want us to discard anything that
  6516. could decrypt a link connection as soon as the link connection
  6517. was closed. Fixes bug 7139; bugfix on all versions of Tor linked
  6518. against OpenSSL 1.0.0 or later. Found by Florent Daignière.
  6519. - Tor tries to wipe potentially sensitive data after using it, so
  6520. that if some subsequent security failure exposes Tor's memory,
  6521. the damage will be limited. But we had a bug where the compiler
  6522. was eliminating these wipe operations when it decided that the
  6523. memory was no longer visible to a (correctly running) program,
  6524. hence defeating our attempt at defense in depth. We fix that
  6525. by using OpenSSL's OPENSSL_cleanse() operation, which a compiler
  6526. is unlikely to optimize away. Future versions of Tor may use
  6527. a less ridiculously heavy approach for this. Fixes bug 7352.
  6528. Reported in an article by Andrey Karpov.
  6529. o Major bugfixes (crashes and asserts):
  6530. - Avoid a pair of double-free and use-after-mark bugs that can
  6531. occur with certain timings in canceled and re-received DNS
  6532. requests. Fixes bug 6472; bugfix on 0.0.7rc1.
  6533. - Fix a denial of service attack by which any directory authority
  6534. could crash all the others, or by which a single v2 directory
  6535. authority could crash everybody downloading v2 directory
  6536. information. Fixes bug 7191; bugfix on 0.2.0.10-alpha.
  6537. - Fix an assert that directory authorities could trigger on sighup
  6538. during some configuration state transitions. We now don't treat
  6539. it as a fatal error when the new descriptor we just generated in
  6540. init_keys() isn't accepted. Fixes bug 4438; bugfix on 0.2.1.9-alpha.
  6541. - Avoid segfault when starting up having run with an extremely old
  6542. version of Tor and parsing its state file. Fixes bug 6801; bugfix
  6543. on 0.2.2.23-alpha.
  6544. o Major bugfixes (clients):
  6545. - If we are unable to find any exit that supports our predicted ports,
  6546. stop calling them predicted, so that we don't loop and build
  6547. hopeless circuits indefinitely. Fixes bug 3296; bugfix on 0.0.9pre6,
  6548. which introduced predicted ports.
  6549. - Check at each new consensus whether our entry guards were picked
  6550. long enough ago that we should rotate them. Previously, we only
  6551. did this check at startup, which could lead to us holding a guard
  6552. indefinitely. Fixes bug 5380; bugfix on 0.2.1.14-rc.
  6553. - When fetching a bridge descriptor from a bridge authority,
  6554. always do so anonymously, whether we have been able to open
  6555. circuits or not. Partial fix for bug 1938; bugfix on 0.2.0.7-alpha.
  6556. This behavior makes it *safer* to use UpdateBridgesFromAuthority,
  6557. but we'll need to wait for bug 6010 before it's actually usable.
  6558. o Major bugfixes (directory voting):
  6559. - Check more thoroughly to prevent a rogue authority from
  6560. double-voting on any consensus directory parameter. Previously,
  6561. authorities would crash in this case if the total number of
  6562. votes for any parameter exceeded the number of active voters,
  6563. but would let it pass otherwise. Partially fixes bug 5786; bugfix
  6564. on 0.2.2.2-alpha.
  6565. - When computing weight parameters, behave more robustly in the
  6566. presence of a bad bwweightscale value. Previously, the authorities
  6567. would crash if they agreed on a sufficiently broken weight_scale
  6568. value; now, they use a reasonable default and carry on. Fixes the
  6569. rest of bug 5786; bugfix on 0.2.2.17-alpha.
  6570. - If authorities are unable to get a v2 consensus document from other
  6571. directory authorities, they no longer fall back to fetching
  6572. them from regular directory caches. Fixes bug 5635; bugfix on
  6573. 0.2.2.26-beta, where routers stopped downloading v2 consensus
  6574. documents entirely.
  6575. o Major bugfixes (relays):
  6576. - Fix a bug handling SENDME cells on nonexistent streams that could
  6577. result in bizarre window values. Report and patch contributed
  6578. pseudonymously. Fixes part of bug 6271. This bug was introduced
  6579. before the first Tor release, in svn commit r152.
  6580. - Don't update the AccountingSoftLimitHitAt state file entry whenever
  6581. tor gets started. This prevents a wrong average bandwidth
  6582. estimate, which would cause relays to always start a new accounting
  6583. interval at the earliest possible moment. Fixes bug 2003; bugfix
  6584. on 0.2.2.7-alpha. Reported by Bryon Eldridge, who also helped
  6585. immensely in tracking this bug down.
  6586. - Fix a possible crash bug when checking for deactivated circuits
  6587. in connection_or_flush_from_first_active_circuit(). Fixes bug 6341;
  6588. bugfix on 0.2.2.7-alpha. Bug report and fix received pseudonymously.
  6589. - Set the SO_REUSEADDR socket option before we call bind() on outgoing
  6590. connections. This change should allow busy exit relays to stop
  6591. running out of available sockets as quickly. Fixes bug 4950;
  6592. bugfix on 0.2.2.26-beta.
  6593. o Major bugfixes (blocking resistance):
  6594. - Bridges no longer include their address in NETINFO cells on outgoing
  6595. OR connections, to allow them to blend in better with clients.
  6596. Removes another avenue for enumerating bridges. Reported by
  6597. "troll_un". Fixes bug 4348; bugfix on 0.2.0.10-alpha, when NETINFO
  6598. cells were introduced.
  6599. - Warn the user when HTTPProxy, but no other proxy type, is
  6600. configured. This can cause surprising behavior: it doesn't send
  6601. all of Tor's traffic over the HTTPProxy -- it sends unencrypted
  6602. directory traffic only. Resolves ticket 4663.
  6603. o Major bugfixes (hidden services):
  6604. - Improve hidden service robustness: when an attempt to connect to
  6605. a hidden service ends, be willing to refetch its hidden service
  6606. descriptors from each of the HSDir relays responsible for them
  6607. immediately. Previously, we would not consider refetching the
  6608. service's descriptors from each HSDir for 15 minutes after the last
  6609. fetch, which was inconvenient if the hidden service was not running
  6610. during the first attempt. Bugfix on 0.2.0.18-alpha; fixes bug 3335.
  6611. - Hidden services now ignore the timestamps on INTRODUCE2 cells.
  6612. They used to check that the timestamp was within 30 minutes
  6613. of their system clock, so they could cap the size of their
  6614. replay-detection cache, but that approach unnecessarily refused
  6615. service to clients with wrong clocks. Bugfix on 0.2.1.6-alpha, when
  6616. the v3 intro-point protocol (the first one which sent a timestamp
  6617. field in the INTRODUCE2 cell) was introduced; fixes bug 3460.
  6618. - When one of a hidden service's introduction points appears to be
  6619. unreachable, stop trying it. Previously, we would keep trying
  6620. to build circuits to the introduction point until we lost the
  6621. descriptor, usually because the user gave up and restarted Tor.
  6622. Fixes part of bug 3825.
  6623. o Changes to default torrc file:
  6624. - Stop listing "socksport 9050" in torrc.sample. We open a socks
  6625. port on 9050 by default anyway, so this should not change anything
  6626. in practice.
  6627. - Stop mentioning the deprecated *ListenAddress options in
  6628. torrc.sample. Fixes bug 5438.
  6629. - Document unit of bandwidth-related options in sample torrc.
  6630. Fixes bug 5621.
  6631. - Fix broken URLs in the sample torrc file, and tell readers about
  6632. the OutboundBindAddress, ExitPolicyRejectPrivate, and
  6633. PublishServerDescriptor options. Addresses bug 4652.
  6634. o Minor features (directory authorities):
  6635. - Consider new, removed or changed IPv6 OR ports a non-cosmetic
  6636. change when the authority is deciding whether to accept a newly
  6637. uploaded descriptor. Implements ticket 6423.
  6638. - Directory authorities are now a little more lenient at accepting
  6639. older router descriptors, or newer router descriptors that don't
  6640. make big changes. This should help ameliorate past and future
  6641. issues where routers think they have uploaded valid descriptors,
  6642. but the authorities don't think so. Fix for ticket 2479.
  6643. - Authority operators can now vote for all relays in a given
  6644. set of countries to be BadDir/BadExit/Invalid/Rejected.
  6645. - Provide two consensus parameters (FastFlagMinThreshold and
  6646. FastFlagMaxThreshold) to control the range of allowable bandwidths
  6647. for the Fast directory flag. These allow authorities to run
  6648. experiments on appropriate requirements for being a "Fast" node.
  6649. The AuthDirFastGuarantee config value still applies. Implements
  6650. ticket 3946.
  6651. o Minor features (bridges / bridge authorities):
  6652. - Make bridge SSL certificates a bit more stealthy by using random
  6653. serial numbers, in the same fashion as OpenSSL when generating
  6654. self-signed certificates. Implements ticket 4584.
  6655. - Tag a bridge's descriptor as "never to be sent unencrypted".
  6656. This shouldn't matter, since bridges don't open non-anonymous
  6657. connections to the bridge authority and don't allow unencrypted
  6658. directory connections from clients, but we might as well make
  6659. sure. Closes bug 5139.
  6660. - The Bridge Authority now writes statistics on how many bridge
  6661. descriptors it gave out in total, and how many unique descriptors
  6662. it gave out. It also lists how often the most and least commonly
  6663. fetched descriptors were given out, as well as the median and
  6664. 25th/75th percentile. Implements tickets 4200 and 4294.
  6665. o Minor features (IPv6):
  6666. - Make the code that clients use to detect an address change be
  6667. IPv6-aware, so that it won't fill clients' logs with error
  6668. messages when trying to get the IPv4 address of an IPv6
  6669. connection. Implements ticket 5537.
  6670. - Relays now understand an IPv6 address when they get one from a
  6671. directory server. Resolves ticket 4875.
  6672. o Minor features (hidden services):
  6673. - Expire old or over-used hidden service introduction points.
  6674. Required by fix for bug 3460.
  6675. - Reduce the lifetime of elements of hidden services' Diffie-Hellman
  6676. public key replay-detection cache from 60 minutes to 5 minutes. This
  6677. replay-detection cache is now used only to detect multiple
  6678. INTRODUCE2 cells specifying the same rendezvous point, so we can
  6679. avoid launching multiple simultaneous attempts to connect to it.
  6680. - When a hidden service's introduction point times out, consider
  6681. trying it again during the next attempt to connect to the
  6682. HS. Previously, we would not try it again unless a newly fetched
  6683. descriptor contained it. Required by fixes for bugs 1297 and 3825.
  6684. o Minor features (relays):
  6685. - Relays now include a reason for regenerating their descriptors
  6686. in an HTTP header when uploading to the authorities. This will
  6687. make it easier to debug descriptor-upload issues in the future.
  6688. - Turn on directory request statistics by default and include them in
  6689. extra-info descriptors. Don't break if we have no GeoIP database.
  6690. - Replace files in stats/ rather than appending to them. Now that we
  6691. include statistics in extra-info descriptors, it makes no sense to
  6692. keep old statistics forever. Implements ticket 2930.
  6693. - Relays that set "ConnDirectionStatistics 1" write statistics on the
  6694. bidirectional use of connections to disk every 24 hours.
  6695. - Add a GeoIP file digest to the extra-info descriptor. Implements
  6696. ticket 1883.
  6697. o Minor features (new config options):
  6698. - New config option "DynamicDHGroups" (disabled by default) provides
  6699. each bridge with a unique prime DH modulus to be used during
  6700. SSL handshakes. This option attempts to help against censors
  6701. who might use the Apache DH modulus as a static identifier for
  6702. bridges. Addresses ticket 4548.
  6703. - New config option "DisableDebuggerAttachment" (on by default)
  6704. to prevent basic debugging attachment attempts by other processes.
  6705. Supports Mac OS X and Gnu/Linux. Resolves ticket 3313.
  6706. - Ordinarily, Tor does not count traffic from private addresses (like
  6707. 127.0.0.1 or 10.0.0.1) when calculating rate limits or accounting.
  6708. There is now a new option, CountPrivateBandwidth, to disable this
  6709. behavior. Patch from Daniel Cagara.
  6710. o Minor features (different behavior for old config options):
  6711. - Allow MapAddress directives to specify matches against super-domains,
  6712. as in "MapAddress *.torproject.org *.torproject.org.torserver.exit".
  6713. Implements issue 933.
  6714. - Don't disable the DirPort when we cannot exceed our AccountingMax
  6715. limit during this interval because the effective bandwidthrate is
  6716. low enough. This is useful in a situation where AccountMax is only
  6717. used as an additional safeguard or to provide statistics.
  6718. - Add port 6523 (Gobby) to LongLivedPorts. Patch by intrigeri;
  6719. implements ticket 3439.
  6720. - When configuring a large set of nodes in EntryNodes, and there are
  6721. enough of them listed as Guard so that we don't need to consider
  6722. the non-guard entries, prefer the ones listed with the Guard flag.
  6723. - If you set the NumCPUs option to 0, Tor will now try to detect how
  6724. many CPUs you have. This is the new default behavior.
  6725. - The NodeFamily option -- which let you declare that you want to
  6726. consider nodes to be part of a family whether they list themselves
  6727. that way or not -- now allows IP address ranges and country codes.
  6728. o Minor features (new command-line config behavior):
  6729. - Slightly change behavior of "list" options (that is, config
  6730. options that can appear more than once) when they appear both in
  6731. torrc and on the command line. Previously, the command-line options
  6732. would be appended to the ones from torrc. Now, the command-line
  6733. options override the torrc options entirely. This new behavior
  6734. allows the user to override list options (like exit policies and
  6735. ports to listen on) from the command line, rather than simply
  6736. appending to the list.
  6737. - You can get the old (appending) command-line behavior for "list"
  6738. options by prefixing the option name with a "+".
  6739. - You can remove all the values for a "list" option from the command
  6740. line without adding any new ones by prefixing the option name
  6741. with a "/".
  6742. o Minor features (controller, new events):
  6743. - Extend the control protocol to report flags that control a circuit's
  6744. path selection in CIRC events and in replies to 'GETINFO
  6745. circuit-status'. Implements part of ticket 2411.
  6746. - Extend the control protocol to report the hidden service address
  6747. and current state of a hidden-service-related circuit in CIRC
  6748. events and in replies to 'GETINFO circuit-status'. Implements part
  6749. of ticket 2411.
  6750. - Include the creation time of a circuit in CIRC and CIRC2
  6751. control-port events and the list produced by the 'GETINFO
  6752. circuit-status' control-port command.
  6753. - Add a new CONF_CHANGED event so that controllers can be notified
  6754. of any configuration changes made by other controllers, or by the
  6755. user. Implements ticket 1692.
  6756. - Add a new SIGNAL event to the controller interface so that
  6757. controllers can be notified when Tor handles a signal. Resolves
  6758. issue 1955. Patch by John Brooks.
  6759. o Minor features (controller, new getinfo options):
  6760. - Expose our view of whether we have gone dormant to the controller,
  6761. via a new "GETINFO dormant" value. Torbutton and other controllers
  6762. can use this to avoid doing periodic requests through Tor while
  6763. it's dormant (bug 4718). Resolves ticket 5954.
  6764. - Add a new GETINFO option to get total bytes read and written. Patch
  6765. from pipe, revised by atagar. Resolves ticket 2345.
  6766. - Implement new GETINFO controller fields to provide information about
  6767. the Tor process's pid, euid, username, and resource limits.
  6768. o Minor features (controller, other):
  6769. - Allow controllers to request an event notification whenever a
  6770. circuit is cannibalized or its purpose is changed. Implements
  6771. part of ticket 3457.
  6772. - Use absolute path names when reporting the torrc filename in the
  6773. control protocol, so a controller can more easily find the torrc
  6774. file. Resolves bug 1101.
  6775. - When reporting the path to the cookie file to the controller,
  6776. give an absolute path. Resolves ticket 4881.
  6777. o Minor features (log messages):
  6778. - Add more information to a log statement that might help track down
  6779. bug 4091. If you're seeing "Bug: tor_addr_is_internal() called with a
  6780. non-IP address" messages (or any Bug messages, for that matter!),
  6781. please let us know about it.
  6782. - If EntryNodes are given, but UseEntryGuards is set to 0, warn that
  6783. EntryNodes will have no effect. Resolves issue 2571.
  6784. - Try to make the introductory warning message that Tor prints on
  6785. startup more useful for actually finding help and information.
  6786. Resolves ticket 2474.
  6787. - When the system call to create a listener socket fails, log the
  6788. error message explaining why. This may help diagnose bug 4027.
  6789. o Minor features (other):
  6790. - When we fail to initialize Libevent, retry with IOCP disabled so we
  6791. don't need to turn on multi-threading support in Libevent, which in
  6792. turn requires a working socketpair(). This is a workaround for bug
  6793. 4457, which affects Libevent versions from 2.0.1-alpha through
  6794. 2.0.15-stable.
  6795. - When starting as root and then changing our UID via the User
  6796. control option, and we have a ControlSocket configured, make sure
  6797. that the ControlSocket is owned by the same account that Tor will
  6798. run under. Implements ticket 3421; fix by Jérémy Bobbio.
  6799. - Accept attempts to include a password authenticator in the
  6800. handshake, as supported by SOCKS5. This handles SOCKS clients that
  6801. don't know how to omit a password when authenticating. Resolves
  6802. bug 1666.
  6803. - Check for and recover from inconsistency in the microdescriptor
  6804. cache. This will make it harder for us to accidentally free a
  6805. microdescriptor without removing it from the appropriate data
  6806. structures. Fixes issue 3135; issue noted by "wanoskarnet".
  6807. - Shorten links in the tor-exit-notice file. Patch by Christian Kujau.
  6808. o Minor bugfixes (code security):
  6809. - Prevent a null-pointer dereference when receiving a data cell
  6810. for a nonexistent stream when the circuit in question has an
  6811. empty deliver window. We don't believe this is triggerable,
  6812. since we don't currently allow deliver windows to become empty,
  6813. but the logic is tricky enough that it's better to make the code
  6814. robust. Fixes bug 5541; bugfix on 0.0.2pre14.
  6815. - Fix a (harmless) integer overflow in cell statistics reported by
  6816. some fast relays. Fixes bug 5849; bugfix on 0.2.2.1-alpha.
  6817. - Fix our implementation of crypto_random_hostname() so it can't
  6818. overflow on ridiculously large inputs. (No Tor version has ever
  6819. provided this kind of bad inputs, but let's be correct in depth.)
  6820. Fixes bug 4413; bugfix on 0.2.2.9-alpha. Fix by Stephen Palmateer.
  6821. - Add a (probably redundant) memory clear between iterations of
  6822. the router status voting loop, to prevent future coding errors
  6823. where data might leak between iterations of the loop. Resolves
  6824. ticket 6514.
  6825. o Minor bugfixes (wrapper functions):
  6826. - Abort if tor_vasprintf() fails in connection_printf_to_buf() (a
  6827. utility function used in the control-port code). This shouldn't
  6828. ever happen unless Tor is completely out of memory, but if it did
  6829. happen and Tor somehow recovered from it, Tor could have sent a log
  6830. message to a control port in the middle of a reply to a controller
  6831. command. Fixes part of bug 3428; bugfix on 0.1.2.3-alpha.
  6832. - Fix some (not actually triggerable) buffer size checks in usage of
  6833. tor_inet_ntop(). Fixes bug 4434; bugfix on Tor 0.2.0.1-alpha. Patch
  6834. by Anders Sundman.
  6835. - Fix parsing of some corner-cases with tor_inet_pton(). Fixes
  6836. bug 4515; bugfix on 0.2.0.1-alpha; fix by Anders Sundman.
  6837. - Enforce correct return behavior of tor_vsscanf() when the '%%'
  6838. pattern is used. Fixes bug 5558. Bugfix on 0.2.1.13.
  6839. - Make our replacement implementation of strtok_r() compatible with
  6840. the standard behavior of strtok_r(). Patch by nils. Fixes bug 5091;
  6841. bugfix on 0.2.2.1-alpha.
  6842. - Find more places in the code that should have been testing for
  6843. invalid sockets using the SOCKET_OK macro. Required for a fix
  6844. for bug 4533. Bugfix on 0.2.2.28-beta.
  6845. o Minor bugfixes (code correctness):
  6846. - Check return value of fputs() when writing authority certificate
  6847. file. Fixes Coverity issue 709056; bugfix on 0.2.0.1-alpha.
  6848. - When building Tor on Windows with -DUNICODE (not default), ensure
  6849. that error messages, filenames, and DNS server names are always
  6850. NUL-terminated when we convert them to a single-byte encoding.
  6851. Fixes bug 5909; bugfix on 0.2.2.16-alpha.
  6852. - Fix a memory leak when trying to launch a DNS request when the
  6853. nameservers are unconfigurable. Fixes bug 5916; bugfix on Tor
  6854. 0.1.2.1-alpha.
  6855. - Correct file sizes when reading binary files on Cygwin, to avoid
  6856. a bug where Tor would fail to read its state file. Fixes bug 6844;
  6857. bugfix on 0.1.2.7-alpha.
  6858. - Make sure to set *socket_error in all error cases in
  6859. connection_connect(), so it can't produce a warning about
  6860. errno being zero from errno_to_orconn_end_reason(). Bugfix on
  6861. 0.2.1.1-alpha; resolves ticket 6028.
  6862. - Initialize conn->addr to a valid state in spawn_cpuworker(). Fixes
  6863. bug 4532; found by "troll_un".
  6864. o Minor bugfixes (clients):
  6865. - Allow one-hop directory-fetching circuits the full "circuit build
  6866. timeout" period, rather than just half of it, before failing them
  6867. and marking the relay down. This fix should help reduce cases where
  6868. clients declare relays (or worse, bridges) unreachable because
  6869. the TLS handshake takes a few seconds to complete. Fixes bug 6743;
  6870. bugfix on 0.2.2.2-alpha, where we changed the timeout from a static
  6871. 30 seconds.
  6872. - Ensure we don't cannibalize circuits that are longer than three hops
  6873. already, so we don't end up making circuits with 5 or more
  6874. hops. Patch contributed by wanoskarnet. Fixes bug 5231; bugfix on
  6875. 0.1.0.1-rc which introduced cannibalization.
  6876. o Minor bugfixes (relays):
  6877. - Don't publish a new relay descriptor when we reload our onion key,
  6878. unless the onion key has actually changed. Fixes bug 3263 and
  6879. resolves another cause of bug 1810. Bugfix on 0.1.1.11-alpha.
  6880. - When relays refuse a "create" cell because their queue of pending
  6881. create cells is too big (typically because their cpu can't keep up
  6882. with the arrival rate), send back reason "resource limit" rather
  6883. than reason "internal", so network measurement scripts can get a
  6884. more accurate picture. Bugfix on 0.1.1.11-alpha; fixes bug 7037.
  6885. - Exit nodes don't need to fetch certificates for authorities that
  6886. they don't recognize; only directory authorities, bridges,
  6887. and caches need to do that. Fixes part of bug 2297; bugfix on
  6888. 0.2.2.11-alpha.
  6889. o Minor bugfixes (directory authority / mirrors):
  6890. - Avoid O(n^2) performance characteristics when parsing a large
  6891. extrainfo cache. Fixes bug 5828; bugfix on 0.2.0.1-alpha.
  6892. - Authorities no longer include any router in their microdescriptor
  6893. consensuses for which they couldn't generate or agree on a
  6894. microdescriptor. Fixes the second piece of bug 6404; fix on
  6895. 0.2.2.6-alpha.
  6896. - When checking for requested signatures on the latest consensus
  6897. before serving it to a client, make sure to check the right
  6898. consensus flavor. Bugfix on 0.2.2.6-alpha.
  6899. - Fix an edge case where TestingTorNetwork is set but the authorities
  6900. and relays all have an uptime of zero, so the private Tor network
  6901. could briefly lack support for hidden services. Fixes bug 3886;
  6902. bugfix on 0.2.2.18-alpha.
  6903. - Directory caches no longer refuse to clean out descriptors because
  6904. of missing v2 networkstatus documents, unless they're configured
  6905. to retrieve v2 networkstatus documents. Fixes bug 4838; bugfix on
  6906. 0.2.2.26-beta. Patch by Daniel Bryg.
  6907. - Don't serve or accept v2 hidden service descriptors over a relay's
  6908. DirPort. It's never correct to do so, and disabling it might
  6909. make it more annoying to exploit any bugs that turn up in the
  6910. descriptor-parsing code. Fixes bug 7149.
  6911. o Minor bugfixes (hidden services, client-side):
  6912. - Assert that hidden-service-related operations are not performed
  6913. using single-hop circuits. Previously, Tor would assert that
  6914. client-side streams are not attached to single-hop circuits,
  6915. but not that other sensitive operations on the client and service
  6916. side are not performed using single-hop circuits. Fixes bug 3332;
  6917. bugfix on 0.0.6.
  6918. - Avoid undefined behavior when parsing the list of supported
  6919. rendezvous/introduction protocols in a hidden service descriptor.
  6920. Previously, Tor would have confused (as-yet-unused) protocol version
  6921. numbers greater than 32 with lower ones on many platforms. Fixes
  6922. bug 6827; bugfix on 0.2.0.10-alpha. Found by George Kadianakis.
  6923. - Don't close hidden service client circuits which have almost
  6924. finished connecting to their destination when they reach
  6925. the normal circuit-build timeout. Previously, we would close
  6926. introduction circuits which are waiting for an acknowledgement
  6927. from the introduction point, and rendezvous circuits which have
  6928. been specified in an INTRODUCE1 cell sent to a hidden service,
  6929. after the normal CBT. Now, we mark them as 'timed out', and launch
  6930. another rendezvous attempt in parallel. This behavior change can
  6931. be disabled using the new CloseHSClientCircuitsImmediatelyOnTimeout
  6932. option. Fixes part of bug 1297; bugfix on 0.2.2.2-alpha.
  6933. o Minor bugfixes (hidden services, service-side):
  6934. - Don't close hidden-service-side rendezvous circuits when they
  6935. reach the normal circuit-build timeout. This behavior change can
  6936. be disabled using the new
  6937. CloseHSServiceRendCircuitsImmediatelyOnTimeout option. Fixes the
  6938. remaining part of bug 1297; bugfix on 0.2.2.2-alpha.
  6939. - Don't launch more than 10 service-side introduction-point circuits
  6940. for a hidden service in five minutes. Previously, we would consider
  6941. launching more introduction-point circuits if at least one second
  6942. had passed without any introduction-point circuits failing. Fixes
  6943. bug 4607; bugfix on 0.0.7pre1.
  6944. o Minor bugfixes (config option behavior):
  6945. - If the user tries to set MyFamily on a bridge, refuse to
  6946. do so, and warn about the security implications. Fixes bug 4657;
  6947. bugfix on 0.2.0.3-alpha.
  6948. - The "--quiet" and "--hush" options now apply not only to Tor's
  6949. behavior before logs are configured, but also to Tor's behavior in
  6950. the absense of configured logs. Fixes bug 3550; bugfix on
  6951. 0.2.0.10-alpha.
  6952. - Change the AllowDotExit rules so they should actually work.
  6953. We now enforce AllowDotExit only immediately after receiving an
  6954. address via SOCKS or DNSPort: other sources are free to provide
  6955. .exit addresses after the resolution occurs. Fixes bug 3940;
  6956. bugfix on 0.2.2.1-alpha.
  6957. - Make "LearnCircuitBuildTimeout 0" work more reliably. Specifically,
  6958. don't depend on the consensus parameters or compute adaptive
  6959. timeouts when it is disabled. Fixes bug 5049; bugfix on
  6960. 0.2.2.14-alpha.
  6961. - After we pick a directory mirror, we would refuse to use it if
  6962. it's in our ExcludeExitNodes list, resulting in mysterious failures
  6963. to bootstrap for people who just wanted to avoid exiting from
  6964. certain locations. Fixes bug 5623; bugfix on 0.2.2.25-alpha.
  6965. - When told to add a bridge with the same digest as a preexisting
  6966. bridge but a different addr:port, change the addr:port as
  6967. requested. Previously we would not notice the change. Fixes half
  6968. of bug 5603; fix on 0.2.2.26-beta.
  6969. o Minor bugfixes (controller):
  6970. - Allow manual 'authenticate' commands to the controller interface
  6971. from netcat (nc) as well as telnet. We were rejecting them because
  6972. they didn't come with the expected whitespace at the end of the
  6973. command. Bugfix on 0.1.1.1-alpha; fixes bug 2893.
  6974. - Report a real bootstrap problem to the controller on router
  6975. identity mismatch. Previously we just said "foo", which probably
  6976. made a lot of sense at the time. Fixes bug 4169; bugfix on
  6977. 0.2.1.1-alpha.
  6978. - When we receive a SIGHUP and the controller __ReloadTorrcOnSIGHUP
  6979. option is set to 0 (which Vidalia version 0.2.16 now does when
  6980. a SAVECONF attempt fails), perform other actions that SIGHUP
  6981. usually causes (like reopening the logs). Fixes bug 5095; bugfix
  6982. on 0.2.1.9-alpha.
  6983. - Correctly handle checking the permissions on the parent
  6984. directory of a control socket in the root directory. Bug found
  6985. by Esteban Manchado Velázquez. Fixes bug 5089; bugfix on Tor
  6986. 0.2.2.26-beta.
  6987. - End AUTHCHALLENGE error messages (in the control protocol) with
  6988. a CRLF. Fixes bug 5760; bugfix on 0.2.2.36.
  6989. o Minor bugfixes (network reading/writing):
  6990. - Disable writing on marked-for-close connections when they are
  6991. blocked on bandwidth, to prevent busy-looping in Libevent. Fixes
  6992. bug 5263; bugfix on 0.0.2pre13, where we first added a special
  6993. case for flushing marked connections.
  6994. - Make sure that there are no unhandled pending TLS errors before
  6995. reading from a TLS stream. We had checks in 0.1.0.3-rc, but
  6996. lost them in 0.1.0.5-rc when we refactored read_to_buf_tls().
  6997. Bugfix on 0.1.0.5-rc; fixes bug 4528.
  6998. - Detect SSL handshake even when the initial attempt to write the
  6999. server hello fails. Fixes bug 4592; bugfix on 0.2.0.13-alpha.
  7000. - If the client fails to set a reasonable set of ciphersuites
  7001. during its v2 handshake renegotiation, allow the renegotiation to
  7002. continue nevertheless (i.e. send all the required certificates).
  7003. Fixes bug 4591; bugfix on 0.2.0.20-rc.
  7004. o Minor bugfixes (other):
  7005. - Exit nodes now correctly report EADDRINUSE and EADDRNOTAVAIL as
  7006. resource exhaustion, so that clients can adjust their load to
  7007. try other exits. Fixes bug 4710; bugfix on 0.1.0.1-rc, which
  7008. started using END_STREAM_REASON_RESOURCELIMIT.
  7009. - Don't check for whether the address we're using for outbound
  7010. connections has changed until after the outbound connection has
  7011. completed. On Windows, getsockname() doesn't succeed until the
  7012. connection is finished. Fixes bug 5374; bugfix on 0.1.1.14-alpha.
  7013. - Don't hold a Windows file handle open for every file mapping;
  7014. the file mapping handle is sufficient. Fixes bug 5951; bugfix on
  7015. 0.1.2.1-alpha.
  7016. - Fix wrong TCP port range in parse_port_range(). Fixes bug 6218;
  7017. bugfix on 0.2.1.10-alpha.
  7018. - If we fail to write a microdescriptor to the disk cache, do not
  7019. continue replacing the old microdescriptor file. Fixes bug 2954;
  7020. bugfix on 0.2.2.6-alpha.
  7021. o Minor bugfixes (log messages, path selection):
  7022. - Downgrade "set buildtimeout to low value" messages to "info"
  7023. severity; they were never an actual problem, there was never
  7024. anything reasonable to do about them, and they tended to spam logs
  7025. from time to time. Fixes bug 6251; bugfix on 0.2.2.2-alpha.
  7026. - Rate-limit the "Weighted bandwidth is 0.000000" message, and add
  7027. more information to it, so that we can track it down in case it
  7028. returns again. Mitigates bug 5235.
  7029. - Check CircuitBuildTimeout and LearnCircuitBuildTimeout in
  7030. options_validate(); warn if LearnCircuitBuildTimeout is disabled and
  7031. CircuitBuildTimeout is set unreasonably low. Resolves ticket 5452.
  7032. - Issue a log message if a guard completes less than 40% of your
  7033. circuits. Threshold is configurable by torrc option
  7034. PathBiasNoticeRate and consensus parameter pb_noticepct. There is
  7035. additional, off-by-default code to disable guards which fail too
  7036. many circuits. Addresses ticket 5458.
  7037. o Minor bugfixes (log messages, client):
  7038. - Downgrade "Got a certificate, but we already have it" log messages
  7039. from warning to info, except when we're a dirauth. Fixes bug 5238;
  7040. bugfix on 0.2.1.7-alpha.
  7041. - Fix the log message describing how we work around discovering
  7042. that our version is the ill-fated OpenSSL 0.9.8l. Fixes bug
  7043. 4837; bugfix on 0.2.2.9-alpha.
  7044. - When logging about a disallowed .exit name, do not also call it
  7045. an "invalid onion address". Fixes bug 3325; bugfix on 0.2.2.9-alpha.
  7046. - Fix a log message suggesting that people contact a non-existent
  7047. email address. Fixes bug 3448.
  7048. - Rephrase the log message emitted if the TestSocks check is
  7049. successful. Patch from Fabian Keil; fixes bug 4094.
  7050. - Log (at debug level) whenever a circuit's purpose is changed.
  7051. - Log SSL state transitions at log level DEBUG, log domain
  7052. HANDSHAKE. This can be useful for debugging censorship events.
  7053. Implements ticket 3264.
  7054. - We now log which torrc file we're using on startup. Implements
  7055. ticket 2444.
  7056. - Rate-limit log messages when asked to connect anonymously to
  7057. a private address. When these hit, they tended to hit fast and
  7058. often. Also, don't bother trying to connect to addresses that we
  7059. are sure will resolve to 127.0.0.1: getting 127.0.0.1 in a directory
  7060. reply makes us think we have been lied to, even when the address the
  7061. client tried to connect to was "localhost." Resolves ticket 2822.
  7062. o Minor bugfixes (log messages, non-client):
  7063. - Downgrade "eventdns rejected address" message to LOG_PROTOCOL_WARN.
  7064. Fixes bug 5932; bugfix on 0.2.2.7-alpha.
  7065. - Don't log that we have "decided to publish new relay descriptor"
  7066. unless we are actually publishing a descriptor. Fixes bug 3942;
  7067. bugfix on 0.2.2.28-beta.
  7068. - Log which authority we're missing votes from when we go to fetch
  7069. them from the other auths.
  7070. - Replace "Sending publish request" log messages with "Launching
  7071. upload", so that they no longer confusingly imply that we're
  7072. sending something to a directory we might not even be connected
  7073. to yet. Fixes bug 3311; bugfix on 0.2.0.10-alpha.
  7074. - Warn when Tor is configured to use accounting in a way that can
  7075. link a hidden service to some other hidden service or public
  7076. address. Resolves ticket 6490.
  7077. - Fix a minor formatting issue in one of tor-gencert's error messages.
  7078. Fixes bug 4574.
  7079. o Testing:
  7080. - Update to the latest version of the tinytest unit testing framework.
  7081. This includes a couple of bugfixes that can be relevant for
  7082. running forked unit tests on Windows, and removes all reserved
  7083. identifiers.
  7084. - Avoid a false positive in the util/threads unit test by increasing
  7085. the maximum timeout time. Fixes bug 6227; bugfix on 0.2.0.4-alpha.
  7086. - Make it possible to set the TestingTorNetwork configuration
  7087. option using AlternateDirAuthority and AlternateBridgeAuthority
  7088. as an alternative to setting DirServer. Addresses ticket 6377.
  7089. - Add a unit test for the environment_variable_names_equal() function.
  7090. - A wide variety of new unit tests by Esteban Manchado Velázquez.
  7091. - Numerous new unit tests for functions in util.c and address.c by
  7092. Anders Sundman.
  7093. - The long-disabled benchmark tests are now split into their own
  7094. ./src/test/bench binary.
  7095. - The benchmark tests can now use more accurate timers than
  7096. gettimeofday() when such timers are available.
  7097. - Use tt_assert(), not tor_assert(), for checking for test failures.
  7098. This makes the unit tests more able to go on in the event that
  7099. one of them fails.
  7100. o Build improvements:
  7101. - Use the dead_strip option when building Tor on OS X. This reduces
  7102. binary size by almost 19% when linking openssl and libevent
  7103. statically, which we do for Tor Browser Bundle.
  7104. - Provide a better error message about possible OSX Asciidoc failure
  7105. reasons. Fixes bug 6436.
  7106. - Detect attempts to build Tor on (as yet hypothetical) versions
  7107. of Windows where sizeof(intptr_t) != sizeof(SOCKET). Partial
  7108. fix for bug 4533. Bugfix on 0.2.2.28-beta.
  7109. - On Windows, we now define the _WIN32_WINNT macros only if they
  7110. are not already defined. This lets the person building Tor decide,
  7111. if they want, to require a later version of Windows.
  7112. - Our autogen.sh script now uses autoreconf to launch autoconf,
  7113. automake, and so on. This is more robust against some of the failure
  7114. modes associated with running the autotools pieces on their own.
  7115. - Running "make version" now displays the version of Tor that
  7116. we're about to build. Idea from katmagic; resolves issue 4400.
  7117. - Make 'tor --digests' list hashes of all Tor source files. Bugfix
  7118. on 0.2.2.4-alpha; fixes bug 3427.
  7119. - New --enable-static-tor configure option for building Tor as
  7120. statically as possible. Idea, general hackery and thoughts from
  7121. Alexei Czeskis, John Gilmore, Jacob Appelbaum. Implements ticket
  7122. 2702.
  7123. - Limited, experimental support for building with nmake and MSVC.
  7124. o Build requirements:
  7125. - Building Tor with bufferevent support now requires Libevent
  7126. 2.0.13-stable or later. Previous versions of Libevent had bugs in
  7127. SSL-related bufferevents and related issues that would make Tor
  7128. work badly with bufferevents. Requiring 2.0.13-stable also allows
  7129. Tor with bufferevents to take advantage of Libevent APIs
  7130. introduced after 2.0.8-rc.
  7131. - Our build system requires automake 1.6 or later to create the
  7132. Makefile.in files. Previously, you could have used 1.4.
  7133. This only affects developers and people building Tor from git;
  7134. people who build Tor from the source distribution without changing
  7135. the Makefile.am files should be fine.
  7136. - Detect when we try to build on a platform that doesn't define
  7137. AF_UNSPEC to 0. We don't work there, so refuse to compile.
  7138. o Build fixes (compile/link):
  7139. - Format more doubles with %f, not %lf. Patch from grarpamp to make
  7140. Tor build correctly on older BSDs again. Fixes bug 3894; bugfix on
  7141. Tor 0.2.0.8-alpha.
  7142. - When building with --enable-static-tor on OpenBSD, do not
  7143. erroneously attempt to link -lrt. Fixes bug 5103.
  7144. - Set _WIN32_WINNT to 0x0501 consistently throughout the code, so
  7145. that IPv6 stuff will compile on MSVC, and compilation issues
  7146. will be easier to track down. Fixes bug 5861.
  7147. - Fix build and 64-bit compile warnings from --enable-openbsd-malloc.
  7148. Fixes bug 6379. Bugfix on 0.2.0.20-rc.
  7149. - Make Tor build correctly again with -DUNICODE -D_UNICODE defined.
  7150. Fixes bug 6097; bugfix on 0.2.2.16-alpha.
  7151. o Build fixes (other):
  7152. - Use the _WIN32 macro throughout our code to detect Windows.
  7153. (Previously we had used the obsolete 'WIN32' and the idiosyncratic
  7154. 'MS_WINDOWS'.)
  7155. - Properly handle the case where the build-tree is not the same
  7156. as the source tree when generating src/common/common_sha1.i,
  7157. src/or/micro-revision.i, and src/or/or_sha1.i. Fixes bug 3953;
  7158. bugfix on 0.2.0.1-alpha.
  7159. - During configure, search for library containing cos function as
  7160. libm lives in libcore on some platforms (BeOS/Haiku). Linking
  7161. against libm was hard-coded before. Fixes the first part of bug
  7162. 4727; bugfix on 0.2.2.2-alpha. Patch and analysis by Martin Hebnes
  7163. Pedersen.
  7164. - Prevent a false positive from the check-spaces script, by disabling
  7165. the "whitespace between function name and (" check for functions
  7166. named 'op()'.
  7167. o Packaging (RPM) changes:
  7168. - Update our default RPM spec files to work with mock and rpmbuild
  7169. on RHEL/Fedora. They have an updated set of dependencies and
  7170. conflicts, a fix for an ancient typo when creating the "_tor"
  7171. user, and better instructions. Thanks to Ondrej Mikle for the
  7172. patch series. Fixes bug 6043.
  7173. - On OpenSUSE, create the /var/run/tor directory on startup if it
  7174. is not already created. Patch from Andreas Stieger. Fixes bug 2573.
  7175. o Code refactoring (safety):
  7176. - Do not use SMARTLIST_FOREACH for any loop whose body exceeds
  7177. 10 lines. Also, don't nest them. Doing so in the past has
  7178. led to hard-to-debug code. The new style is to use the
  7179. SMARTLIST_FOREACH_{BEGIN,END} pair. Addresses issue 6400.
  7180. - Use macros to indicate OpenSSL versions, so we don't need to worry
  7181. about accidental hexadecimal bit shifts.
  7182. - Use tor_sscanf() in place of scanf() in more places through the
  7183. code. This makes us a little more locale-independent, and
  7184. should help shut up code-analysis tools that can't tell
  7185. a safe sscanf string from a dangerous one.
  7186. - Convert more instances of tor_snprintf+tor_strdup into tor_asprintf.
  7187. - Use the smartlist_add_asprintf() alias more consistently.
  7188. o Code refactoring (consolidate):
  7189. - A major revision to our internal node-selecting and listing logic.
  7190. Tor already had at least two major ways to look at the question of
  7191. "which Tor servers do we know about": a list of router descriptors,
  7192. and a list of entries in the current consensus. With
  7193. microdescriptors, we're adding a third. Having so many systems
  7194. without an abstraction layer over them was hurting the codebase.
  7195. Now, we have a new "node_t" abstraction that presents a consistent
  7196. interface to a client's view of a Tor node, and holds (nearly) all
  7197. of the mutable state formerly in routerinfo_t and routerstatus_t.
  7198. - Move tor_gettimeofday_cached() into compat_libevent.c, and use
  7199. Libevent's notion of cached time when possible.
  7200. - Remove duplicate code for invoking getrlimit() from control.c.
  7201. - Use OpenSSL's built-in SSL_state_string_long() instead of our
  7202. own homebrewed ssl_state_to_string() replacement. Patch from
  7203. Emile Snyder. Fixes bug 4653.
  7204. - Change the symmetric cipher interface so that creating and
  7205. initializing a stream cipher are no longer separate functions.
  7206. o Code refactoring (separate):
  7207. - Make a new "entry connection" struct as an internal subtype of "edge
  7208. connection", to simplify the code and make exit connections smaller.
  7209. - Split connection_about_to_close() into separate functions for each
  7210. connection type.
  7211. - Rewrite the listener-selection logic so that parsing which ports
  7212. we want to listen on is now separate from binding to the ports
  7213. we want.
  7214. o Code refactoring (name changes):
  7215. - Rename a handful of old identifiers, mostly related to crypto
  7216. structures and crypto functions. By convention, our "create an
  7217. object" functions are called "type_new()", our "free an object"
  7218. functions are called "type_free()", and our types indicate that
  7219. they are types only with a final "_t". But a handful of older
  7220. types and functions broke these rules, with function names like
  7221. "type_create" or "subsystem_op_type", or with type names like
  7222. type_env_t.
  7223. - Rename Tor functions that turn strings into addresses, so that
  7224. "parse" indicates that no hostname resolution occurs, and
  7225. "lookup" indicates that hostname resolution may occur. This
  7226. should help prevent mistakes in the future. Fixes bug 3512.
  7227. - Use the name "CERTS" consistently to refer to the new cell type;
  7228. we were calling it CERT in some places and CERTS in others.
  7229. - Use a TOR_INVALID_SOCKET macro when initializing a socket to an
  7230. invalid value, rather than just -1.
  7231. - Rename the bench_{aes,dmap} functions to test_*, so that tinytest
  7232. can pick them up when the tests aren't disabled. Bugfix on
  7233. 0.2.2.4-alpha which introduced tinytest.
  7234. o Code refactoring (other):
  7235. - Defensively refactor rend_mid_rendezvous() so that protocol
  7236. violations and length checks happen in the beginning. Fixes
  7237. bug 5645.
  7238. - Remove the pure attribute from all functions that used it
  7239. previously. In many cases we assigned it incorrectly, because the
  7240. functions might assert or call impure functions, and we don't have
  7241. evidence that keeping the pure attribute is worthwhile. Implements
  7242. changes suggested in ticket 4421.
  7243. - Move the replay-detection cache for the RSA-encrypted parts of
  7244. INTRODUCE2 cells to the introduction point data structures.
  7245. Previously, we would use one replay-detection cache per hidden
  7246. service. Required by fix for bug 3460.
  7247. - The helper programs tor-gencert, tor-resolve, and tor-checkkey
  7248. no longer link against Libevent: they never used it, but
  7249. our library structure used to force them to link it.
  7250. o Removed features and files:
  7251. - Remove all internal support for unpadded RSA. We never used it, and
  7252. it would be a bad idea to start.
  7253. - Remove some workaround code for OpenSSL 0.9.6 (which is no longer
  7254. supported).
  7255. - Remove some redundant #include directives throughout the code.
  7256. Patch from Andrea Gelmini.
  7257. - Remove some old code to remember statistics about which descriptors
  7258. we've served as a directory mirror. The feature wasn't used and
  7259. is outdated now that microdescriptors are around.
  7260. - Remove some old code to work around even older versions of Tor that
  7261. used forked processes to handle DNS requests. Such versions of Tor
  7262. are no longer in use as relays.
  7263. - The "torify" script no longer supports the "tsocks" socksifier
  7264. tool, since tsocks doesn't support DNS and UDP right for Tor.
  7265. Everyone should be using torsocks instead. Fixes bugs 3530 and
  7266. 5180. Based on a patch by "ugh".
  7267. - Remove the torrc.bridge file: we don't use it for anything, and
  7268. it had become badly desynchronized from torrc.sample. Resolves
  7269. bug 5622.
  7270. o Documentation:
  7271. - Begin a doc/state-contents.txt file to explain the contents of
  7272. the Tor state file. Fixes bug 2987.
  7273. - Clarify the documentation for the Alternate*Authority options.
  7274. Fixes bug 6387.
  7275. - Document the --defaults-torrc option, and the new semantics for
  7276. overriding, extending, and clearing lists of options. Closes
  7277. bug 4748.
  7278. - Add missing man page documentation for consensus and microdesc
  7279. files. Resolves ticket 6732.
  7280. - Fix some typos in the manpages. Patch from A. Costa. Fixes bug 6500.
  7281. o Documentation fixes:
  7282. - Improve the manual's documentation for the NT Service command-line
  7283. options. Addresses ticket 3964.
  7284. - Clarify SessionGroup documentation slightly; resolves ticket 5437.
  7285. - Document the changes to the ORPort and DirPort options, and the
  7286. fact that {OR/Dir}ListenAddress is now unnecessary (and
  7287. therefore deprecated). Resolves ticket 5597.
  7288. - Correct a broken faq link in the INSTALL file. Fixes bug 2307.
  7289. - Clarify that hidden services are TCP only. Fixes bug 6024.
  7290. Changes in version 0.2.2.39 - 2012-09-11
  7291. Tor 0.2.2.39 fixes two more opportunities for remotely triggerable
  7292. assertions.
  7293. o Security fixes:
  7294. - Fix an assertion failure in tor_timegm() that could be triggered
  7295. by a badly formatted directory object. Bug found by fuzzing with
  7296. Radamsa. Fixes bug 6811; bugfix on 0.2.0.20-rc.
  7297. - Do not crash when comparing an address with port value 0 to an
  7298. address policy. This bug could have been used to cause a remote
  7299. assertion failure by or against directory authorities, or to
  7300. allow some applications to crash clients. Fixes bug 6690; bugfix
  7301. on 0.2.1.10-alpha.
  7302. Changes in version 0.2.2.38 - 2012-08-12
  7303. Tor 0.2.2.38 fixes a remotely triggerable crash bug, and fixes a timing
  7304. attack that could in theory leak path information.
  7305. o Security fixes:
  7306. - Avoid an uninitialized memory read when reading a vote or consensus
  7307. document that has an unrecognized flavor name. This read could
  7308. lead to a remote crash bug. Fixes bug 6530; bugfix on 0.2.2.6-alpha.
  7309. - Try to leak less information about what relays a client is
  7310. choosing to a side-channel attacker. Previously, a Tor client would
  7311. stop iterating through the list of available relays as soon as it
  7312. had chosen one, thus finishing a little earlier when it picked
  7313. a router earlier in the list. If an attacker can recover this
  7314. timing information (nontrivial but not proven to be impossible),
  7315. they could learn some coarse-grained information about which relays
  7316. a client was picking (middle nodes in particular are likelier to
  7317. be affected than exits). The timing attack might be mitigated by
  7318. other factors (see bug 6537 for some discussion), but it's best
  7319. not to take chances. Fixes bug 6537; bugfix on 0.0.8rc1.
  7320. Changes in version 0.2.2.37 - 2012-06-06
  7321. Tor 0.2.2.37 introduces a workaround for a critical renegotiation
  7322. bug in OpenSSL 1.0.1 (where 20% of the Tor network can't talk to itself
  7323. currently).
  7324. o Major bugfixes:
  7325. - Work around a bug in OpenSSL that broke renegotiation with TLS
  7326. 1.1 and TLS 1.2. Without this workaround, all attempts to speak
  7327. the v2 Tor connection protocol when both sides were using OpenSSL
  7328. 1.0.1 would fail. Resolves ticket 6033.
  7329. - When waiting for a client to renegotiate, don't allow it to add
  7330. any bytes to the input buffer. This fixes a potential DoS issue.
  7331. Fixes bugs 5934 and 6007; bugfix on 0.2.0.20-rc.
  7332. - Fix an edge case where if we fetch or publish a hidden service
  7333. descriptor, we might build a 4-hop circuit and then use that circuit
  7334. for exiting afterwards -- even if the new last hop doesn't obey our
  7335. ExitNodes config option. Fixes bug 5283; bugfix on 0.2.0.10-alpha.
  7336. o Minor bugfixes:
  7337. - Fix a build warning with Clang 3.1 related to our use of vasprintf.
  7338. Fixes bug 5969. Bugfix on 0.2.2.11-alpha.
  7339. o Minor features:
  7340. - Tell GCC and Clang to check for any errors in format strings passed
  7341. to the tor_v*(print|scan)f functions.
  7342. Changes in version 0.2.2.36 - 2012-05-24
  7343. Tor 0.2.2.36 updates the addresses for two of the eight directory
  7344. authorities, fixes some potential anonymity and security issues,
  7345. and fixes several crash bugs.
  7346. Tor 0.2.1.x has reached its end-of-life. Those Tor versions have many
  7347. known flaws, and nobody should be using them. You should upgrade. If
  7348. you're using a Linux or BSD and its packages are obsolete, stop using
  7349. those packages and upgrade anyway.
  7350. o Directory authority changes:
  7351. - Change IP address for maatuska (v3 directory authority).
  7352. - Change IP address for ides (v3 directory authority), and rename
  7353. it to turtles.
  7354. o Security fixes:
  7355. - When building or running with any version of OpenSSL earlier
  7356. than 0.9.8s or 1.0.0f, disable SSLv3 support. These OpenSSL
  7357. versions have a bug (CVE-2011-4576) in which their block cipher
  7358. padding includes uninitialized data, potentially leaking sensitive
  7359. information to any peer with whom they make a SSLv3 connection. Tor
  7360. does not use SSL v3 by default, but a hostile client or server
  7361. could force an SSLv3 connection in order to gain information that
  7362. they shouldn't have been able to get. The best solution here is to
  7363. upgrade to OpenSSL 0.9.8s or 1.0.0f (or later). But when building
  7364. or running with a non-upgraded OpenSSL, we disable SSLv3 entirely
  7365. to make sure that the bug can't happen.
  7366. - Never use a bridge or a controller-supplied node as an exit, even
  7367. if its exit policy allows it. Found by wanoskarnet. Fixes bug
  7368. 5342. Bugfix on 0.1.1.15-rc (for controller-purpose descriptors)
  7369. and 0.2.0.3-alpha (for bridge-purpose descriptors).
  7370. - Only build circuits if we have a sufficient threshold of the total
  7371. descriptors that are marked in the consensus with the "Exit"
  7372. flag. This mitigates an attack proposed by wanoskarnet, in which
  7373. all of a client's bridges collude to restrict the exit nodes that
  7374. the client knows about. Fixes bug 5343.
  7375. - Provide controllers with a safer way to implement the cookie
  7376. authentication mechanism. With the old method, if another locally
  7377. running program could convince a controller that it was the Tor
  7378. process, then that program could trick the controller into telling
  7379. it the contents of an arbitrary 32-byte file. The new "SAFECOOKIE"
  7380. authentication method uses a challenge-response approach to prevent
  7381. this attack. Fixes bug 5185; implements proposal 193.
  7382. o Major bugfixes:
  7383. - Avoid logging uninitialized data when unable to decode a hidden
  7384. service descriptor cookie. Fixes bug 5647; bugfix on 0.2.1.5-alpha.
  7385. - Avoid a client-side assertion failure when receiving an INTRODUCE2
  7386. cell on a general purpose circuit. Fixes bug 5644; bugfix on
  7387. 0.2.1.6-alpha.
  7388. - Fix builds when the path to sed, openssl, or sha1sum contains
  7389. spaces, which is pretty common on Windows. Fixes bug 5065; bugfix
  7390. on 0.2.2.1-alpha.
  7391. - Correct our replacements for the timeradd() and timersub() functions
  7392. on platforms that lack them (for example, Windows). The timersub()
  7393. function is used when expiring circuits, while timeradd() is
  7394. currently unused. Bug report and patch by Vektor. Fixes bug 4778;
  7395. bugfix on 0.2.2.24-alpha.
  7396. - Fix the SOCKET_OK test that we use to tell when socket
  7397. creation fails so that it works on Win64. Fixes part of bug 4533;
  7398. bugfix on 0.2.2.29-beta. Bug found by wanoskarnet.
  7399. o Minor bugfixes:
  7400. - Reject out-of-range times like 23:59:61 in parse_rfc1123_time().
  7401. Fixes bug 5346; bugfix on 0.0.8pre3.
  7402. - Make our number-parsing functions always treat too-large values
  7403. as an error, even when those values exceed the width of the
  7404. underlying type. Previously, if the caller provided these
  7405. functions with minima or maxima set to the extreme values of the
  7406. underlying integer type, these functions would return those
  7407. values on overflow rather than treating overflow as an error.
  7408. Fixes part of bug 5786; bugfix on 0.0.9.
  7409. - Older Linux kernels erroneously respond to strange nmap behavior
  7410. by having accept() return successfully with a zero-length
  7411. socket. When this happens, just close the connection. Previously,
  7412. we would try harder to learn the remote address: but there was
  7413. no such remote address to learn, and our method for trying to
  7414. learn it was incorrect. Fixes bugs 1240, 4745, and 4747. Bugfix
  7415. on 0.1.0.3-rc. Reported and diagnosed by "r1eo".
  7416. - Correct parsing of certain date types in parse_http_time().
  7417. Without this patch, If-Modified-Since would behave
  7418. incorrectly. Fixes bug 5346; bugfix on 0.2.0.2-alpha. Patch from
  7419. Esteban Manchado Velázques.
  7420. - Change the BridgePassword feature (part of the "bridge community"
  7421. design, which is not yet implemented) to use a time-independent
  7422. comparison. The old behavior might have allowed an adversary
  7423. to use timing to guess the BridgePassword value. Fixes bug 5543;
  7424. bugfix on 0.2.0.14-alpha.
  7425. - Detect and reject certain misformed escape sequences in
  7426. configuration values. Previously, these values would cause us
  7427. to crash if received in a torrc file or over an authenticated
  7428. control port. Bug found by Esteban Manchado Velázquez, and
  7429. independently by Robert Connolly from Matta Consulting who further
  7430. noted that it allows a post-authentication heap overflow. Patch
  7431. by Alexander Schrijver. Fixes bugs 5090 and 5402 (CVE 2012-1668);
  7432. bugfix on 0.2.0.16-alpha.
  7433. - Fix a compile warning when using the --enable-openbsd-malloc
  7434. configure option. Fixes bug 5340; bugfix on 0.2.0.20-rc.
  7435. - During configure, detect when we're building with clang version
  7436. 3.0 or lower and disable the -Wnormalized=id and -Woverride-init
  7437. CFLAGS. clang doesn't support them yet.
  7438. - When sending an HTTP/1.1 proxy request, include a Host header.
  7439. Fixes bug 5593; bugfix on 0.2.2.1-alpha.
  7440. - Fix a NULL-pointer dereference on a badly formed SETCIRCUITPURPOSE
  7441. command. Found by mikeyc. Fixes bug 5796; bugfix on 0.2.2.9-alpha.
  7442. - If we hit the error case where routerlist_insert() replaces an
  7443. existing (old) server descriptor, make sure to remove that
  7444. server descriptor from the old_routers list. Fix related to bug
  7445. 1776. Bugfix on 0.2.2.18-alpha.
  7446. o Minor bugfixes (documentation and log messages):
  7447. - Fix a typo in a log message in rend_service_rendezvous_has_opened().
  7448. Fixes bug 4856; bugfix on Tor 0.0.6.
  7449. - Update "ClientOnly" man page entry to explain that there isn't
  7450. really any point to messing with it. Resolves ticket 5005.
  7451. - Document the GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays
  7452. directory authority option (introduced in Tor 0.2.2.34).
  7453. - Downgrade the "We're missing a certificate" message from notice
  7454. to info: people kept mistaking it for a real problem, whereas it
  7455. is seldom the problem even when we are failing to bootstrap. Fixes
  7456. bug 5067; bugfix on 0.2.0.10-alpha.
  7457. - Correctly spell "connect" in a log message on failure to create a
  7458. controlsocket. Fixes bug 4803; bugfix on 0.2.2.26-beta.
  7459. - Clarify the behavior of MaxCircuitDirtiness with hidden service
  7460. circuits. Fixes issue 5259.
  7461. o Minor features:
  7462. - Directory authorities now reject versions of Tor older than
  7463. 0.2.1.30, and Tor versions between 0.2.2.1-alpha and 0.2.2.20-alpha
  7464. inclusive. These versions accounted for only a small fraction of
  7465. the Tor network, and have numerous known security issues. Resolves
  7466. issue 4788.
  7467. - Update to the May 1 2012 Maxmind GeoLite Country database.
  7468. - Feature removal:
  7469. - When sending or relaying a RELAY_EARLY cell, we used to convert
  7470. it to a RELAY cell if the connection was using the v1 link
  7471. protocol. This was a workaround for older versions of Tor, which
  7472. didn't handle RELAY_EARLY cells properly. Now that all supported
  7473. versions can handle RELAY_EARLY cells, and now that we're enforcing
  7474. the "no RELAY_EXTEND commands except in RELAY_EARLY cells" rule,
  7475. remove this workaround. Addresses bug 4786.
  7476. Changes in version 0.2.2.35 - 2011-12-16
  7477. Tor 0.2.2.35 fixes a critical heap-overflow security issue in Tor's
  7478. buffers code. Absolutely everybody should upgrade.
  7479. The bug relied on an incorrect calculation when making data continuous
  7480. in one of our IO buffers, if the first chunk of the buffer was
  7481. misaligned by just the wrong amount. The miscalculation would allow an
  7482. attacker to overflow a piece of heap-allocated memory. To mount this
  7483. attack, the attacker would need to either open a SOCKS connection to
  7484. Tor's SocksPort (usually restricted to localhost), or target a Tor
  7485. instance configured to make its connections through a SOCKS proxy
  7486. (which Tor does not do by default).
  7487. Good security practice requires that all heap-overflow bugs should be
  7488. presumed to be exploitable until proven otherwise, so we are treating
  7489. this as a potential code execution attack. Please upgrade immediately!
  7490. This bug does not affect bufferevents-based builds of Tor. Special
  7491. thanks to "Vektor" for reporting this issue to us!
  7492. Tor 0.2.2.35 also fixes several bugs in previous versions, including
  7493. crash bugs for unusual configurations, and a long-term bug that
  7494. would prevent Tor from starting on Windows machines with draconian
  7495. AV software.
  7496. With this release, we remind everyone that 0.2.0.x has reached its
  7497. formal end-of-life. Those Tor versions have many known flaws, and
  7498. nobody should be using them. You should upgrade -- ideally to the
  7499. 0.2.2.x series. If you're using a Linux or BSD and its packages are
  7500. obsolete, stop using those packages and upgrade anyway.
  7501. The Tor 0.2.1.x series is also approaching its end-of-life: it will no
  7502. longer receive support after some time in early 2012.
  7503. o Major bugfixes:
  7504. - Fix a heap overflow bug that could occur when trying to pull
  7505. data into the first chunk of a buffer, when that chunk had
  7506. already had some data drained from it. Fixes CVE-2011-2778;
  7507. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  7508. - Initialize Libevent with the EVENT_BASE_FLAG_NOLOCK flag enabled, so
  7509. that it doesn't attempt to allocate a socketpair. This could cause
  7510. some problems on Windows systems with overzealous firewalls. Fix for
  7511. bug 4457; workaround for Libevent versions 2.0.1-alpha through
  7512. 2.0.15-stable.
  7513. - If we mark an OR connection for close based on a cell we process,
  7514. don't process any further cells on it. We already avoid further
  7515. reads on marked-for-close connections, but now we also discard the
  7516. cells we'd already read. Fixes bug 4299; bugfix on 0.2.0.10-alpha,
  7517. which was the first version where we might mark a connection for
  7518. close based on processing a cell on it.
  7519. - Correctly sanity-check that we don't underflow on a memory
  7520. allocation (and then assert) for hidden service introduction
  7521. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  7522. bugfix on 0.2.1.5-alpha.
  7523. - Fix a memory leak when we check whether a hidden service
  7524. descriptor has any usable introduction points left. Fixes bug
  7525. 4424. Bugfix on 0.2.2.25-alpha.
  7526. - Don't crash when we're running as a relay and don't have a GeoIP
  7527. file. Bugfix on 0.2.2.34; fixes bug 4340. This backports a fix
  7528. we've had in the 0.2.3.x branch already.
  7529. - When running as a client, do not print a misleading (and plain
  7530. wrong) log message that we're collecting "directory request"
  7531. statistics: clients don't collect statistics. Also don't create a
  7532. useless (because empty) stats file in the stats/ directory. Fixes
  7533. bug 4353; bugfix on 0.2.2.34.
  7534. o Minor bugfixes:
  7535. - Detect failure to initialize Libevent. This fix provides better
  7536. detection for future instances of bug 4457.
  7537. - Avoid frequent calls to the fairly expensive cull_wedged_cpuworkers
  7538. function. This was eating up hideously large amounts of time on some
  7539. busy servers. Fixes bug 4518; bugfix on 0.0.9.8.
  7540. - Resolve an integer overflow bug in smartlist_ensure_capacity().
  7541. Fixes bug 4230; bugfix on Tor 0.1.0.1-rc. Based on a patch by
  7542. Mansour Moufid.
  7543. - Don't warn about unused log_mutex in log.c when building with
  7544. --disable-threads using a recent GCC. Fixes bug 4437; bugfix on
  7545. 0.1.0.6-rc which introduced --disable-threads.
  7546. - When configuring, starting, or stopping an NT service, stop
  7547. immediately after the service configuration attempt has succeeded
  7548. or failed. Fixes bug 3963; bugfix on 0.2.0.7-alpha.
  7549. - When sending a NETINFO cell, include the original address
  7550. received for the other side, not its canonical address. Found
  7551. by "troll_un"; fixes bug 4349; bugfix on 0.2.0.10-alpha.
  7552. - Fix a typo in a hibernation-related log message. Fixes bug 4331;
  7553. bugfix on 0.2.2.23-alpha; found by "tmpname0901".
  7554. - Fix a memory leak in launch_direct_bridge_descriptor_fetch() that
  7555. occurred when a client tried to fetch a descriptor for a bridge
  7556. in ExcludeNodes. Fixes bug 4383; bugfix on 0.2.2.25-alpha.
  7557. - Backport fixes for a pair of compilation warnings on Windows.
  7558. Fixes bug 4521; bugfix on 0.2.2.28-beta and on 0.2.2.29-beta.
  7559. - If we had ever tried to call tor_addr_to_str on an address of
  7560. unknown type, we would have done a strdup on an uninitialized
  7561. buffer. Now we won't. Fixes bug 4529; bugfix on 0.2.1.3-alpha.
  7562. Reported by "troll_un".
  7563. - Correctly detect and handle transient lookup failures from
  7564. tor_addr_lookup. Fixes bug 4530; bugfix on 0.2.1.5-alpha.
  7565. Reported by "troll_un".
  7566. - Fix null-pointer access that could occur if TLS allocation failed.
  7567. Fixes bug 4531; bugfix on 0.2.0.20-rc. Found by "troll_un".
  7568. - Use tor_socket_t type for listener argument to accept(). Fixes bug
  7569. 4535; bugfix on 0.2.2.28-beta. Found by "troll_un".
  7570. o Minor features:
  7571. - Add two new config options for directory authorities:
  7572. AuthDirFastGuarantee sets a bandwidth threshold for guaranteeing the
  7573. Fast flag, and AuthDirGuardBWGuarantee sets a bandwidth threshold
  7574. that is always sufficient to satisfy the bandwidth requirement for
  7575. the Guard flag. Now it will be easier for researchers to simulate
  7576. Tor networks with different values. Resolves ticket 4484.
  7577. - When Tor ignores a hidden service specified in its configuration,
  7578. include the hidden service's directory in the warning message.
  7579. Previously, we would only tell the user that some hidden service
  7580. was ignored. Bugfix on 0.0.6; fixes bug 4426.
  7581. - Update to the December 6 2011 Maxmind GeoLite Country database.
  7582. o Packaging changes:
  7583. - Make it easier to automate expert package builds on Windows,
  7584. by removing an absolute path from makensis.exe command.
  7585. Changes in version 0.2.1.32 - 2011-12-16
  7586. Tor 0.2.1.32 backports important security and privacy fixes for
  7587. oldstable. This release is intended only for package maintainers and
  7588. others who cannot use the 0.2.2 stable series. All others should be
  7589. using Tor 0.2.2.x or newer.
  7590. The Tor 0.2.1.x series will reach formal end-of-life some time in
  7591. early 2012; we will stop releasing patches for it then.
  7592. o Major bugfixes (also included in 0.2.2.x):
  7593. - Correctly sanity-check that we don't underflow on a memory
  7594. allocation (and then assert) for hidden service introduction
  7595. point decryption. Bug discovered by Dan Rosenberg. Fixes bug 4410;
  7596. bugfix on 0.2.1.5-alpha.
  7597. - Fix a heap overflow bug that could occur when trying to pull
  7598. data into the first chunk of a buffer, when that chunk had
  7599. already had some data drained from it. Fixes CVE-2011-2778;
  7600. bugfix on 0.2.0.16-alpha. Reported by "Vektor".
  7601. o Minor features:
  7602. - Update to the December 6 2011 Maxmind GeoLite Country database.
  7603. Changes in version 0.2.2.34 - 2011-10-26
  7604. Tor 0.2.2.34 fixes a critical anonymity vulnerability where an attacker
  7605. can deanonymize Tor users. Everybody should upgrade.
  7606. The attack relies on four components: 1) Clients reuse their TLS cert
  7607. when talking to different relays, so relays can recognize a user by
  7608. the identity key in her cert. 2) An attacker who knows the client's
  7609. identity key can probe each guard relay to see if that identity key
  7610. is connected to that guard relay right now. 3) A variety of active
  7611. attacks in the literature (starting from "Low-Cost Traffic Analysis
  7612. of Tor" by Murdoch and Danezis in 2005) allow a malicious website to
  7613. discover the guard relays that a Tor user visiting the website is using.
  7614. 4) Clients typically pick three guards at random, so the set of guards
  7615. for a given user could well be a unique fingerprint for her. This
  7616. release fixes components #1 and #2, which is enough to block the attack;
  7617. the other two remain as open research problems. Special thanks to
  7618. "frosty_un" for reporting the issue to us!
  7619. Clients should upgrade so they are no longer recognizable by the TLS
  7620. certs they present. Relays should upgrade so they no longer allow a
  7621. remote attacker to probe them to test whether unpatched clients are
  7622. currently connected to them.
  7623. This release also fixes several vulnerabilities that allow an attacker
  7624. to enumerate bridge relays. Some bridge enumeration attacks still
  7625. remain; see for example proposal 188.
  7626. o Privacy/anonymity fixes (clients):
  7627. - Clients and bridges no longer send TLS certificate chains on
  7628. outgoing OR connections. Previously, each client or bridge would
  7629. use the same cert chain for all outgoing OR connections until
  7630. its IP address changes, which allowed any relay that the client
  7631. or bridge contacted to determine which entry guards it is using.
  7632. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  7633. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  7634. no longer considers that connection as suitable for satisfying a
  7635. circuit EXTEND request. Now relays can protect clients from the
  7636. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  7637. - Directory authorities no longer assign the Guard flag to relays
  7638. that haven't upgraded to the above "refuse EXTEND requests
  7639. to client connections" fix. Now directory authorities can
  7640. protect clients from the CVE-2011-2768 issue even if neither
  7641. the clients nor the relays have upgraded yet. There's a new
  7642. "GiveGuardFlagTo_CVE_2011_2768_VulnerableRelays" config option
  7643. to let us transition smoothly, else tomorrow there would be no
  7644. guard relays.
  7645. o Privacy/anonymity fixes (bridge enumeration):
  7646. - Bridge relays now do their directory fetches inside Tor TLS
  7647. connections, like all the other clients do, rather than connecting
  7648. directly to the DirPort like public relays do. Removes another
  7649. avenue for enumerating bridges. Fixes bug 4115; bugfix on 0.2.0.35.
  7650. - Bridges relays now build circuits for themselves in a more similar
  7651. way to how clients build them. Removes another avenue for
  7652. enumerating bridges. Fixes bug 4124; bugfix on 0.2.0.3-alpha,
  7653. when bridges were introduced.
  7654. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  7655. that they initiated. Relays could distinguish incoming bridge
  7656. connections from client connections, creating another avenue for
  7657. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  7658. Found by "frosty_un".
  7659. o Major bugfixes:
  7660. - Fix a crash bug when changing node restrictions while a DNS lookup
  7661. is in-progress. Fixes bug 4259; bugfix on 0.2.2.25-alpha. Bugfix
  7662. by "Tey'".
  7663. - Don't launch a useless circuit after failing to use one of a
  7664. hidden service's introduction points. Previously, we would
  7665. launch a new introduction circuit, but not set the hidden service
  7666. which that circuit was intended to connect to, so it would never
  7667. actually be used. A different piece of code would then create a
  7668. new introduction circuit correctly. Bug reported by katmagic and
  7669. found by Sebastian Hahn. Bugfix on 0.2.1.13-alpha; fixes bug 4212.
  7670. o Minor bugfixes:
  7671. - Change an integer overflow check in the OpenBSD_Malloc code so
  7672. that GCC is less likely to eliminate it as impossible. Patch
  7673. from Mansour Moufid. Fixes bug 4059.
  7674. - When a hidden service turns an extra service-side introduction
  7675. circuit into a general-purpose circuit, free the rend_data and
  7676. intro_key fields first, so we won't leak memory if the circuit
  7677. is cannibalized for use as another service-side introduction
  7678. circuit. Bugfix on 0.2.1.7-alpha; fixes bug 4251.
  7679. - Bridges now skip DNS self-tests, to act a little more stealthily.
  7680. Fixes bug 4201; bugfix on 0.2.0.3-alpha, which first introduced
  7681. bridges. Patch by "warms0x".
  7682. - Fix internal bug-checking logic that was supposed to catch
  7683. failures in digest generation so that it will fail more robustly
  7684. if we ask for a nonexistent algorithm. Found by Coverity Scan.
  7685. Bugfix on 0.2.2.1-alpha; fixes Coverity CID 479.
  7686. - Report any failure in init_keys() calls launched because our
  7687. IP address has changed. Spotted by Coverity Scan. Bugfix on
  7688. 0.1.1.4-alpha; fixes CID 484.
  7689. o Minor bugfixes (log messages and documentation):
  7690. - Remove a confusing dollar sign from the example fingerprint in the
  7691. man page, and also make the example fingerprint a valid one. Fixes
  7692. bug 4309; bugfix on 0.2.1.3-alpha.
  7693. - The next version of Windows will be called Windows 8, and it has
  7694. a major version of 6, minor version of 2. Correctly identify that
  7695. version instead of calling it "Very recent version". Resolves
  7696. ticket 4153; reported by funkstar.
  7697. - Downgrade log messages about circuit timeout calibration from
  7698. "notice" to "info": they don't require or suggest any human
  7699. intervention. Patch from Tom Lowenthal. Fixes bug 4063;
  7700. bugfix on 0.2.2.14-alpha.
  7701. o Minor features:
  7702. - Turn on directory request statistics by default and include them in
  7703. extra-info descriptors. Don't break if we have no GeoIP database.
  7704. Backported from 0.2.3.1-alpha; implements ticket 3951.
  7705. - Update to the October 4 2011 Maxmind GeoLite Country database.
  7706. Changes in version 0.2.1.31 - 2011-10-26
  7707. Tor 0.2.1.31 backports important security and privacy fixes for
  7708. oldstable. This release is intended only for package maintainers and
  7709. others who cannot use the 0.2.2 stable series. All others should be
  7710. using Tor 0.2.2.x or newer.
  7711. o Security fixes (also included in 0.2.2.x):
  7712. - Replace all potentially sensitive memory comparison operations
  7713. with versions whose runtime does not depend on the data being
  7714. compared. This will help resist a class of attacks where an
  7715. adversary can use variations in timing information to learn
  7716. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  7717. implementation by Robert Ransom based partially on code by DJB.)
  7718. - Fix an assert in parsing router descriptors containing IPv6
  7719. addresses. This one took down the directory authorities when
  7720. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  7721. o Privacy/anonymity fixes (also included in 0.2.2.x):
  7722. - Clients and bridges no longer send TLS certificate chains on
  7723. outgoing OR connections. Previously, each client or bridge would
  7724. use the same cert chain for all outgoing OR connections until
  7725. its IP address changes, which allowed any relay that the client
  7726. or bridge contacted to determine which entry guards it is using.
  7727. Fixes CVE-2011-2768. Bugfix on 0.0.9pre5; found by "frosty_un".
  7728. - If a relay receives a CREATE_FAST cell on a TLS connection, it
  7729. no longer considers that connection as suitable for satisfying a
  7730. circuit EXTEND request. Now relays can protect clients from the
  7731. CVE-2011-2768 issue even if the clients haven't upgraded yet.
  7732. - Bridges now refuse CREATE or CREATE_FAST cells on OR connections
  7733. that they initiated. Relays could distinguish incoming bridge
  7734. connections from client connections, creating another avenue for
  7735. enumerating bridges. Fixes CVE-2011-2769. Bugfix on 0.2.0.3-alpha.
  7736. Found by "frosty_un".
  7737. - When receiving a hidden service descriptor, check that it is for
  7738. the hidden service we wanted. Previously, Tor would store any
  7739. hidden service descriptors that a directory gave it, whether it
  7740. wanted them or not. This wouldn't have let an attacker impersonate
  7741. a hidden service, but it did let directories pre-seed a client
  7742. with descriptors that it didn't want. Bugfix on 0.0.6.
  7743. - Avoid linkability based on cached hidden service descriptors: forget
  7744. all hidden service descriptors cached as a client when processing a
  7745. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  7746. - Make the bridge directory authority refuse to answer directory
  7747. requests for "all" descriptors. It used to include bridge
  7748. descriptors in its answer, which was a major information leak.
  7749. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  7750. - Don't attach new streams to old rendezvous circuits after SIGNAL
  7751. NEWNYM. Previously, we would keep using an existing rendezvous
  7752. circuit if it remained open (i.e. if it were kept open by a
  7753. long-lived stream, or if a new stream were attached to it before
  7754. Tor could notice that it was old and no longer in use). Bugfix on
  7755. 0.1.1.15-rc; fixes bug 3375.
  7756. o Minor bugfixes (also included in 0.2.2.x):
  7757. - When we restart our relay, we might get a successful connection
  7758. from the outside before we've started our reachability tests,
  7759. triggering a warning: "ORPort found reachable, but I have no
  7760. routerinfo yet. Failing to inform controller of success." This
  7761. bug was harmless unless Tor is running under a controller
  7762. like Vidalia, in which case the controller would never get a
  7763. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  7764. fixes bug 1172.
  7765. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  7766. enabled. Fixes bug 1526.
  7767. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  7768. anything since 0.2.1.16-rc.
  7769. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  7770. None of the cases where we did this before were wrong, but by making
  7771. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  7772. - Fix a rare crash bug that could occur when a client was configured
  7773. with a large number of bridges. Fixes bug 2629; bugfix on
  7774. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  7775. - Correct the warning displayed when a rendezvous descriptor exceeds
  7776. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  7777. John Brooks.
  7778. - Fix an uncommon assertion failure when running with DNSPort under
  7779. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  7780. - When warning about missing zlib development packages during compile,
  7781. give the correct package names. Bugfix on 0.2.0.1-alpha.
  7782. - Require that introduction point keys and onion keys have public
  7783. exponent 65537. Bugfix on 0.2.0.10-alpha.
  7784. - Do not crash when our configuration file becomes unreadable, for
  7785. example due to a permissions change, between when we start up
  7786. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  7787. on 0.0.9pre6.
  7788. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  7789. Fixes bug 3208.
  7790. - Always NUL-terminate the sun_path field of a sockaddr_un before
  7791. passing it to the kernel. (Not a security issue: kernels are
  7792. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  7793. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  7794. - Don't stack-allocate the list of supplementary GIDs when we're
  7795. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  7796. could take up to 256K, which is way too much stack. Found by
  7797. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  7798. o Minor bugfixes (only in 0.2.1.x):
  7799. - Resume using micro-version numbers in 0.2.1.x: our Debian packages
  7800. rely on them. Bugfix on 0.2.1.30.
  7801. - Use git revisions instead of svn revisions when generating our
  7802. micro-version numbers. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  7803. o Minor features (also included in 0.2.2.x):
  7804. - Adjust the expiration time on our SSL session certificates to
  7805. better match SSL certs seen in the wild. Resolves ticket 4014.
  7806. - Allow nameservers with IPv6 address. Resolves bug 2574.
  7807. - Update to the October 4 2011 Maxmind GeoLite Country database.
  7808. Changes in version 0.2.2.33 - 2011-09-13
  7809. Tor 0.2.2.33 fixes several bugs, and includes a slight tweak to Tor's
  7810. TLS handshake that makes relays and bridges that run this new version
  7811. reachable from Iran again.
  7812. o Major bugfixes:
  7813. - Avoid an assertion failure when reloading a configuration with
  7814. TrackExitHosts changes. Found and fixed by 'laruldan'. Fixes bug
  7815. 3923; bugfix on 0.2.2.25-alpha.
  7816. o Minor features (security):
  7817. - Check for replays of the public-key encrypted portion of an
  7818. INTRODUCE1 cell, in addition to the current check for replays of
  7819. the g^x value. This prevents a possible class of active attacks
  7820. by an attacker who controls both an introduction point and a
  7821. rendezvous point, and who uses the malleability of AES-CTR to
  7822. alter the encrypted g^x portion of the INTRODUCE1 cell. We think
  7823. that these attacks are infeasible (requiring the attacker to send
  7824. on the order of zettabytes of altered cells in a short interval),
  7825. but we'd rather block them off in case there are any classes of
  7826. this attack that we missed. Reported by Willem Pinckaers.
  7827. o Minor features:
  7828. - Adjust the expiration time on our SSL session certificates to
  7829. better match SSL certs seen in the wild. Resolves ticket 4014.
  7830. - Change the default required uptime for a relay to be accepted as
  7831. a HSDir (hidden service directory) from 24 hours to 25 hours.
  7832. Improves on 0.2.0.10-alpha; resolves ticket 2649.
  7833. - Add a VoteOnHidServDirectoriesV2 config option to allow directory
  7834. authorities to abstain from voting on assignment of the HSDir
  7835. consensus flag. Related to bug 2649.
  7836. - Update to the September 6 2011 Maxmind GeoLite Country database.
  7837. o Minor bugfixes (documentation and log messages):
  7838. - Correct the man page to explain that HashedControlPassword and
  7839. CookieAuthentication can both be set, in which case either method
  7840. is sufficient to authenticate to Tor. Bugfix on 0.2.0.7-alpha,
  7841. when we decided to allow these config options to both be set. Issue
  7842. raised by bug 3898.
  7843. - Demote the 'replay detected' log message emitted when a hidden
  7844. service receives the same Diffie-Hellman public key in two different
  7845. INTRODUCE2 cells to info level. A normal Tor client can cause that
  7846. log message during its normal operation. Bugfix on 0.2.1.6-alpha;
  7847. fixes part of bug 2442.
  7848. - Demote the 'INTRODUCE2 cell is too {old,new}' log message to info
  7849. level. There is nothing that a hidden service's operator can do
  7850. to fix its clients' clocks. Bugfix on 0.2.1.6-alpha; fixes part
  7851. of bug 2442.
  7852. - Clarify a log message specifying the characters permitted in
  7853. HiddenServiceAuthorizeClient client names. Previously, the log
  7854. message said that "[A-Za-z0-9+-_]" were permitted; that could have
  7855. given the impression that every ASCII character between "+" and "_"
  7856. was permitted. Now we say "[A-Za-z0-9+_-]". Bugfix on 0.2.1.5-alpha.
  7857. o Build fixes:
  7858. - Provide a substitute implementation of lround() for MSVC, which
  7859. apparently lacks it. Patch from Gisle Vanem.
  7860. - Clean up some code issues that prevented Tor from building on older
  7861. BSDs. Fixes bug 3894; reported by "grarpamp".
  7862. - Search for a platform-specific version of "ar" when cross-compiling.
  7863. Should fix builds on iOS. Resolves bug 3909, found by Marco Bonetti.
  7864. Changes in version 0.2.2.32 - 2011-08-27
  7865. The Tor 0.2.2 release series is dedicated to the memory of Andreas
  7866. Pfitzmann (1958-2010), a pioneer in anonymity and privacy research,
  7867. a founder of the PETS community, a leader in our field, a mentor,
  7868. and a friend. He left us with these words: "I had the possibility
  7869. to contribute to this world that is not as it should be. I hope I
  7870. could help in some areas to make the world a better place, and that
  7871. I could also encourage other people to be engaged in improving the
  7872. world. Please, stay engaged. This world needs you, your love, your
  7873. initiative -- now I cannot be part of that anymore."
  7874. Tor 0.2.2.32, the first stable release in the 0.2.2 branch, is finally
  7875. ready. More than two years in the making, this release features improved
  7876. client performance and hidden service reliability, better compatibility
  7877. for Android, correct behavior for bridges that listen on more than
  7878. one address, more extensible and flexible directory object handling,
  7879. better reporting of network statistics, improved code security, and
  7880. many many other features and bugfixes.
  7881. o Major features (client performance):
  7882. - When choosing which cells to relay first, relays now favor circuits
  7883. that have been quiet recently, to provide lower latency for
  7884. low-volume circuits. By default, relays enable or disable this
  7885. feature based on a setting in the consensus. They can override
  7886. this default by using the new "CircuitPriorityHalflife" config
  7887. option. Design and code by Ian Goldberg, Can Tang, and Chris
  7888. Alexander.
  7889. - Directory authorities now compute consensus weightings that instruct
  7890. clients how to weight relays flagged as Guard, Exit, Guard+Exit,
  7891. and no flag. Clients use these weightings to distribute network load
  7892. more evenly across these different relay types. The weightings are
  7893. in the consensus so we can change them globally in the future. Extra
  7894. thanks to "outofwords" for finding some nasty security bugs in
  7895. the first implementation of this feature.
  7896. o Major features (client performance, circuit build timeout):
  7897. - Tor now tracks how long it takes to build client-side circuits
  7898. over time, and adapts its timeout to local network performance.
  7899. Since a circuit that takes a long time to build will also provide
  7900. bad performance, we get significant latency improvements by
  7901. discarding the slowest 20% of circuits. Specifically, Tor creates
  7902. circuits more aggressively than usual until it has enough data
  7903. points for a good timeout estimate. Implements proposal 151.
  7904. - Circuit build timeout constants can be controlled by consensus
  7905. parameters. We set good defaults for these parameters based on
  7906. experimentation on broadband and simulated high-latency links.
  7907. - Circuit build time learning can be disabled via consensus parameter
  7908. or by the client via a LearnCircuitBuildTimeout config option. We
  7909. also automatically disable circuit build time calculation if either
  7910. AuthoritativeDirectory is set, or if we fail to write our state
  7911. file. Implements ticket 1296.
  7912. o Major features (relays use their capacity better):
  7913. - Set SO_REUSEADDR socket option on all sockets, not just
  7914. listeners. This should help busy exit nodes avoid running out of
  7915. useable ports just because all the ports have been used in the
  7916. near past. Resolves issue 2850.
  7917. - Relays now save observed peak bandwidth throughput rates to their
  7918. state file (along with total usage, which was already saved),
  7919. so that they can determine their correct estimated bandwidth on
  7920. restart. Resolves bug 1863, where Tor relays would reset their
  7921. estimated bandwidth to 0 after restarting.
  7922. - Lower the maximum weighted-fractional-uptime cutoff to 98%. This
  7923. should give us approximately 40-50% more Guard-flagged nodes,
  7924. improving the anonymity the Tor network can provide and also
  7925. decreasing the dropoff in throughput that relays experience when
  7926. they first get the Guard flag.
  7927. - Directory authorities now take changes in router IP address and
  7928. ORPort into account when determining router stability. Previously,
  7929. if a router changed its IP or ORPort, the authorities would not
  7930. treat it as having any downtime for the purposes of stability
  7931. calculation, whereas clients would experience downtime since the
  7932. change would take a while to propagate to them. Resolves issue 1035.
  7933. - New AccelName and AccelDir options add support for dynamic OpenSSL
  7934. hardware crypto acceleration engines.
  7935. o Major features (relays control their load better):
  7936. - Exit relays now try harder to block exit attempts from unknown
  7937. relays, to make it harder for people to use them as one-hop proxies
  7938. a la tortunnel. Controlled by the refuseunknownexits consensus
  7939. parameter (currently enabled), or you can override it on your
  7940. relay with the RefuseUnknownExits torrc option. Resolves bug 1751;
  7941. based on a variant of proposal 163.
  7942. - Add separate per-conn write limiting to go with the per-conn read
  7943. limiting. We added a global write limit in Tor 0.1.2.5-alpha,
  7944. but never per-conn write limits.
  7945. - New consensus params "bwconnrate" and "bwconnburst" to let us
  7946. rate-limit client connections as they enter the network. It's
  7947. controlled in the consensus so we can turn it on and off for
  7948. experiments. It's starting out off. Based on proposal 163.
  7949. o Major features (controllers):
  7950. - Export GeoIP information on bridge usage to controllers even if we
  7951. have not yet been running for 24 hours. Now Vidalia bridge operators
  7952. can get more accurate and immediate feedback about their
  7953. contributions to the network.
  7954. - Add an __OwningControllerProcess configuration option and a
  7955. TAKEOWNERSHIP control-port command. Now a Tor controller can ensure
  7956. that when it exits, Tor will shut down. Implements feature 3049.
  7957. o Major features (directory authorities):
  7958. - Directory authorities now create, vote on, and serve multiple
  7959. parallel formats of directory data as part of their voting process.
  7960. Partially implements Proposal 162: "Publish the consensus in
  7961. multiple flavors".
  7962. - Directory authorities now agree on and publish small summaries
  7963. of router information that clients can use in place of regular
  7964. server descriptors. This transition will allow Tor 0.2.3 clients
  7965. to use far less bandwidth for downloading information about the
  7966. network. Begins the implementation of Proposal 158: "Clients
  7967. download consensus + microdescriptors".
  7968. - The directory voting system is now extensible to use multiple hash
  7969. algorithms for signatures and resource selection. Newer formats
  7970. are signed with SHA256, with a possibility for moving to a better
  7971. hash algorithm in the future.
  7972. - Directory authorities can now vote on arbitary integer values as
  7973. part of the consensus process. This is designed to help set
  7974. network-wide parameters. Implements proposal 167.
  7975. o Major features and bugfixes (node selection):
  7976. - Revise and reconcile the meaning of the ExitNodes, EntryNodes,
  7977. ExcludeEntryNodes, ExcludeExitNodes, ExcludeNodes, and Strict*Nodes
  7978. options. Previously, we had been ambiguous in describing what
  7979. counted as an "exit" node, and what operations exactly "StrictNodes
  7980. 0" would permit. This created confusion when people saw nodes built
  7981. through unexpected circuits, and made it hard to tell real bugs from
  7982. surprises. Now the intended behavior is:
  7983. . "Exit", in the context of ExitNodes and ExcludeExitNodes, means
  7984. a node that delivers user traffic outside the Tor network.
  7985. . "Entry", in the context of EntryNodes, means a node used as the
  7986. first hop of a multihop circuit. It doesn't include direct
  7987. connections to directory servers.
  7988. . "ExcludeNodes" applies to all nodes.
  7989. . "StrictNodes" changes the behavior of ExcludeNodes only. When
  7990. StrictNodes is set, Tor should avoid all nodes listed in
  7991. ExcludeNodes, even when it will make user requests fail. When
  7992. StrictNodes is *not* set, then Tor should follow ExcludeNodes
  7993. whenever it can, except when it must use an excluded node to
  7994. perform self-tests, connect to a hidden service, provide a
  7995. hidden service, fulfill a .exit request, upload directory
  7996. information, or fetch directory information.
  7997. Collectively, the changes to implement the behavior fix bug 1090.
  7998. - If EntryNodes, ExitNodes, ExcludeNodes, or ExcludeExitNodes
  7999. change during a config reload, mark and discard all our origin
  8000. circuits. This fix should address edge cases where we change the
  8001. config options and but then choose a circuit that we created before
  8002. the change.
  8003. - Make EntryNodes config option much more aggressive even when
  8004. StrictNodes is not set. Before it would prepend your requested
  8005. entrynodes to your list of guard nodes, but feel free to use others
  8006. after that. Now it chooses only from your EntryNodes if any of
  8007. those are available, and only falls back to others if a) they're
  8008. all down and b) StrictNodes is not set.
  8009. - Now we refresh your entry guards from EntryNodes at each consensus
  8010. fetch -- rather than just at startup and then they slowly rot as
  8011. the network changes.
  8012. - Add support for the country code "{??}" in torrc options like
  8013. ExcludeNodes, to indicate all routers of unknown country. Closes
  8014. bug 1094.
  8015. - ExcludeNodes now takes precedence over EntryNodes and ExitNodes: if
  8016. a node is listed in both, it's treated as excluded.
  8017. - ExcludeNodes now applies to directory nodes -- as a preference if
  8018. StrictNodes is 0, or an absolute requirement if StrictNodes is 1.
  8019. Don't exclude all the directory authorities and set StrictNodes to 1
  8020. unless you really want your Tor to break.
  8021. - ExcludeNodes and ExcludeExitNodes now override exit enclaving.
  8022. - ExcludeExitNodes now overrides .exit requests.
  8023. - We don't use bridges listed in ExcludeNodes.
  8024. - When StrictNodes is 1:
  8025. . We now apply ExcludeNodes to hidden service introduction points
  8026. and to rendezvous points selected by hidden service users. This
  8027. can make your hidden service less reliable: use it with caution!
  8028. . If we have used ExcludeNodes on ourself, do not try relay
  8029. reachability self-tests.
  8030. . If we have excluded all the directory authorities, we will not
  8031. even try to upload our descriptor if we're a relay.
  8032. . Do not honor .exit requests to an excluded node.
  8033. - When the set of permitted nodes changes, we now remove any mappings
  8034. introduced via TrackExitHosts to now-excluded nodes. Bugfix on
  8035. 0.1.0.1-rc.
  8036. - We never cannibalize a circuit that had excluded nodes on it, even
  8037. if StrictNodes is 0. Bugfix on 0.1.0.1-rc.
  8038. - Improve log messages related to excluded nodes.
  8039. o Major features (misc):
  8040. - Numerous changes, bugfixes, and workarounds from Nathan Freitas
  8041. to help Tor build correctly for Android phones.
  8042. - The options SocksPort, ControlPort, and so on now all accept a
  8043. value "auto" that opens a socket on an OS-selected port. A
  8044. new ControlPortWriteToFile option tells Tor to write its
  8045. actual control port or ports to a chosen file. If the option
  8046. ControlPortFileGroupReadable is set, the file is created as
  8047. group-readable. Now users can run two Tor clients on the same
  8048. system without needing to manually mess with parameters. Resolves
  8049. part of ticket 3076.
  8050. - Tor now supports tunneling all of its outgoing connections over
  8051. a SOCKS proxy, using the SOCKS4Proxy and/or SOCKS5Proxy
  8052. configuration options. Code by Christopher Davis.
  8053. o Code security improvements:
  8054. - Replace all potentially sensitive memory comparison operations
  8055. with versions whose runtime does not depend on the data being
  8056. compared. This will help resist a class of attacks where an
  8057. adversary can use variations in timing information to learn
  8058. sensitive data. Fix for one case of bug 3122. (Safe memcmp
  8059. implementation by Robert Ransom based partially on code by DJB.)
  8060. - Enable Address Space Layout Randomization (ASLR) and Data Execution
  8061. Prevention (DEP) by default on Windows to make it harder for
  8062. attackers to exploit vulnerabilities. Patch from John Brooks.
  8063. - New "--enable-gcc-hardening" ./configure flag (off by default)
  8064. to turn on gcc compile time hardening options. It ensures
  8065. that signed ints have defined behavior (-fwrapv), enables
  8066. -D_FORTIFY_SOURCE=2 (requiring -O2), adds stack smashing protection
  8067. with canaries (-fstack-protector-all), turns on ASLR protection if
  8068. supported by the kernel (-fPIE, -pie), and adds additional security
  8069. related warnings. Verified to work on Mac OS X and Debian Lenny.
  8070. - New "--enable-linker-hardening" ./configure flag (off by default)
  8071. to turn on ELF specific hardening features (relro, now). This does
  8072. not work with Mac OS X or any other non-ELF binary format.
  8073. - Always search the Windows system directory for system DLLs, and
  8074. nowhere else. Bugfix on 0.1.1.23; fixes bug 1954.
  8075. - New DisableAllSwap option. If set to 1, Tor will attempt to lock all
  8076. current and future memory pages via mlockall(). On supported
  8077. platforms (modern Linux and probably BSD but not Windows or OS X),
  8078. this should effectively disable any and all attempts to page out
  8079. memory. This option requires that you start your Tor as root --
  8080. if you use DisableAllSwap, please consider using the User option
  8081. to properly reduce the privileges of your Tor.
  8082. o Major bugfixes (crashes):
  8083. - Fix crash bug on platforms where gmtime and localtime can return
  8084. NULL. Windows 7 users were running into this one. Fixes part of bug
  8085. 2077. Bugfix on all versions of Tor. Found by boboper.
  8086. - Introduce minimum/maximum values that clients will believe
  8087. from the consensus. Now we'll have a better chance to avoid crashes
  8088. or worse when a consensus param has a weird value.
  8089. - Fix a rare crash bug that could occur when a client was configured
  8090. with a large number of bridges. Fixes bug 2629; bugfix on
  8091. 0.2.1.2-alpha. Bugfix by trac user "shitlei".
  8092. - Do not crash when our configuration file becomes unreadable, for
  8093. example due to a permissions change, between when we start up
  8094. and when a controller calls SAVECONF. Fixes bug 3135; bugfix
  8095. on 0.0.9pre6.
  8096. - If we're in the pathological case where there's no exit bandwidth
  8097. but there is non-exit bandwidth, or no guard bandwidth but there
  8098. is non-guard bandwidth, don't crash during path selection. Bugfix
  8099. on 0.2.0.3-alpha.
  8100. - Fix a crash bug when trying to initialize the evdns module in
  8101. Libevent 2. Bugfix on 0.2.1.16-rc.
  8102. o Major bugfixes (stability):
  8103. - Fix an assert in parsing router descriptors containing IPv6
  8104. addresses. This one took down the directory authorities when
  8105. somebody tried some experimental code. Bugfix on 0.2.1.3-alpha.
  8106. - Fix an uncommon assertion failure when running with DNSPort under
  8107. heavy load. Fixes bug 2933; bugfix on 0.2.0.1-alpha.
  8108. - Treat an unset $HOME like an empty $HOME rather than triggering an
  8109. assert. Bugfix on 0.0.8pre1; fixes bug 1522.
  8110. - More gracefully handle corrupt state files, removing asserts
  8111. in favor of saving a backup and resetting state.
  8112. - Instead of giving an assertion failure on an internal mismatch
  8113. on estimated freelist size, just log a BUG warning and try later.
  8114. Mitigates but does not fix bug 1125.
  8115. - Fix an assert that got triggered when using the TestingTorNetwork
  8116. configuration option and then issuing a GETINFO config-text control
  8117. command. Fixes bug 2250; bugfix on 0.2.1.2-alpha.
  8118. - If the cached cert file is unparseable, warn but don't exit.
  8119. o Privacy fixes (relays/bridges):
  8120. - Don't list Windows capabilities in relay descriptors. We never made
  8121. use of them, and maybe it's a bad idea to publish them. Bugfix
  8122. on 0.1.1.8-alpha.
  8123. - If the Nickname configuration option isn't given, Tor would pick a
  8124. nickname based on the local hostname as the nickname for a relay.
  8125. Because nicknames are not very important in today's Tor and the
  8126. "Unnamed" nickname has been implemented, this is now problematic
  8127. behavior: It leaks information about the hostname without being
  8128. useful at all. Fixes bug 2979; bugfix on 0.1.2.2-alpha, which
  8129. introduced the Unnamed nickname. Reported by tagnaq.
  8130. - Maintain separate TLS contexts and certificates for incoming and
  8131. outgoing connections in bridge relays. Previously we would use the
  8132. same TLS contexts and certs for incoming and outgoing connections.
  8133. Bugfix on 0.2.0.3-alpha; addresses bug 988.
  8134. - Maintain separate identity keys for incoming and outgoing TLS
  8135. contexts in bridge relays. Previously we would use the same
  8136. identity keys for incoming and outgoing TLS contexts. Bugfix on
  8137. 0.2.0.3-alpha; addresses the other half of bug 988.
  8138. - Make the bridge directory authority refuse to answer directory
  8139. requests for "all descriptors". It used to include bridge
  8140. descriptors in its answer, which was a major information leak.
  8141. Found by "piebeer". Bugfix on 0.2.0.3-alpha.
  8142. o Privacy fixes (clients):
  8143. - When receiving a hidden service descriptor, check that it is for
  8144. the hidden service we wanted. Previously, Tor would store any
  8145. hidden service descriptors that a directory gave it, whether it
  8146. wanted them or not. This wouldn't have let an attacker impersonate
  8147. a hidden service, but it did let directories pre-seed a client
  8148. with descriptors that it didn't want. Bugfix on 0.0.6.
  8149. - Start the process of disabling ".exit" address notation, since it
  8150. can be used for a variety of esoteric application-level attacks
  8151. on users. To reenable it, set "AllowDotExit 1" in your torrc. Fix
  8152. on 0.0.9rc5.
  8153. - Reject attempts at the client side to open connections to private
  8154. IP addresses (like 127.0.0.1, 10.0.0.1, and so on) with
  8155. a randomly chosen exit node. Attempts to do so are always
  8156. ill-defined, generally prevented by exit policies, and usually
  8157. in error. This will also help to detect loops in transparent
  8158. proxy configurations. You can disable this feature by setting
  8159. "ClientRejectInternalAddresses 0" in your torrc.
  8160. - Log a notice when we get a new control connection. Now it's easier
  8161. for security-conscious users to recognize when a local application
  8162. is knocking on their controller door. Suggested by bug 1196.
  8163. o Privacy fixes (newnym):
  8164. - Avoid linkability based on cached hidden service descriptors: forget
  8165. all hidden service descriptors cached as a client when processing a
  8166. SIGNAL NEWNYM command. Fixes bug 3000; bugfix on 0.0.6.
  8167. - On SIGHUP, do not clear out all TrackHostExits mappings, client
  8168. DNS cache entries, and virtual address mappings: that's what
  8169. NEWNYM is for. Fixes bug 1345; bugfix on 0.1.0.1-rc.
  8170. - Don't attach new streams to old rendezvous circuits after SIGNAL
  8171. NEWNYM. Previously, we would keep using an existing rendezvous
  8172. circuit if it remained open (i.e. if it were kept open by a
  8173. long-lived stream, or if a new stream were attached to it before
  8174. Tor could notice that it was old and no longer in use). Bugfix on
  8175. 0.1.1.15-rc; fixes bug 3375.
  8176. o Major bugfixes (relay bandwidth accounting):
  8177. - Fix a bug that could break accounting on 64-bit systems with large
  8178. time_t values, making them hibernate for impossibly long intervals.
  8179. Fixes bug 2146. Bugfix on 0.0.9pre6; fix by boboper.
  8180. - Fix a bug in bandwidth accounting that could make us use twice
  8181. the intended bandwidth when our interval start changes due to
  8182. daylight saving time. Now we tolerate skew in stored vs computed
  8183. interval starts: if the start of the period changes by no more than
  8184. 50% of the period's duration, we remember bytes that we transferred
  8185. in the old period. Fixes bug 1511; bugfix on 0.0.9pre5.
  8186. o Major bugfixes (bridges):
  8187. - Bridges now use "reject *:*" as their default exit policy. Bugfix
  8188. on 0.2.0.3-alpha. Fixes bug 1113.
  8189. - If you configure your bridge with a known identity fingerprint,
  8190. and the bridge authority is unreachable (as it is in at least
  8191. one country now), fall back to directly requesting the descriptor
  8192. from the bridge. Finishes the feature started in 0.2.0.10-alpha;
  8193. closes bug 1138.
  8194. - Fix a bug where bridge users who configure the non-canonical
  8195. address of a bridge automatically switch to its canonical
  8196. address. If a bridge listens at more than one address, it
  8197. should be able to advertise those addresses independently and
  8198. any non-blocked addresses should continue to work. Bugfix on Tor
  8199. 0.2.0.3-alpha. Fixes bug 2510.
  8200. - If you configure Tor to use bridge A, and then quit and
  8201. configure Tor to use bridge B instead (or if you change Tor
  8202. to use bridge B via the controller), it would happily continue
  8203. to use bridge A if it's still reachable. While this behavior is
  8204. a feature if your goal is connectivity, in some scenarios it's a
  8205. dangerous bug. Bugfix on Tor 0.2.0.1-alpha; fixes bug 2511.
  8206. - When the controller configures a new bridge, don't wait 10 to 60
  8207. seconds before trying to fetch its descriptor. Bugfix on
  8208. 0.2.0.3-alpha; fixes bug 3198 (suggested by 2355).
  8209. o Major bugfixes (directory authorities):
  8210. - Many relays have been falling out of the consensus lately because
  8211. not enough authorities know about their descriptor for them to get
  8212. a majority of votes. When we deprecated the v2 directory protocol,
  8213. we got rid of the only way that v3 authorities can hear from each
  8214. other about other descriptors. Now authorities examine every v3
  8215. vote for new descriptors, and fetch them from that authority. Bugfix
  8216. on 0.2.1.23.
  8217. - Authorities could be tricked into giving out the Exit flag to relays
  8218. that didn't allow exiting to any ports. This bug could screw
  8219. with load balancing and stats. Bugfix on 0.1.1.6-alpha; fixes bug
  8220. 1238. Bug discovered by Martin Kowalczyk.
  8221. - If all authorities restart at once right before a consensus vote,
  8222. nobody will vote about "Running", and clients will get a consensus
  8223. with no usable relays. Instead, authorities refuse to build a
  8224. consensus if this happens. Bugfix on 0.2.0.10-alpha; fixes bug 1066.
  8225. o Major bugfixes (stream-level fairness):
  8226. - When receiving a circuit-level SENDME for a blocked circuit, try
  8227. to package cells fairly from all the streams that had previously
  8228. been blocked on that circuit. Previously, we had started with the
  8229. oldest stream, and allowed each stream to potentially exhaust
  8230. the circuit's package window. This gave older streams on any
  8231. given circuit priority over newer ones. Fixes bug 1937. Detected
  8232. originally by Camilo Viecco. This bug was introduced before the
  8233. first Tor release, in svn commit r152: it is the new winner of
  8234. the longest-lived bug prize.
  8235. - Fix a stream fairness bug that would cause newer streams on a given
  8236. circuit to get preference when reading bytes from the origin or
  8237. destination. Fixes bug 2210. Fix by Mashael AlSabah. This bug was
  8238. introduced before the first Tor release, in svn revision r152.
  8239. - When the exit relay got a circuit-level sendme cell, it started
  8240. reading on the exit streams, even if had 500 cells queued in the
  8241. circuit queue already, so the circuit queue just grew and grew in
  8242. some cases. We fix this by not re-enabling reading on receipt of a
  8243. sendme cell when the cell queue is blocked. Fixes bug 1653. Bugfix
  8244. on 0.2.0.1-alpha. Detected by Mashael AlSabah. Original patch by
  8245. "yetonetime".
  8246. - Newly created streams were allowed to read cells onto circuits,
  8247. even if the circuit's cell queue was blocked and waiting to drain.
  8248. This created potential unfairness, as older streams would be
  8249. blocked, but newer streams would gladly fill the queue completely.
  8250. We add code to detect this situation and prevent any stream from
  8251. getting more than one free cell. Bugfix on 0.2.0.1-alpha. Partially
  8252. fixes bug 1298.
  8253. o Major bugfixes (hidden services):
  8254. - Apply circuit timeouts to opened hidden-service-related circuits
  8255. based on the correct start time. Previously, we would apply the
  8256. circuit build timeout based on time since the circuit's creation;
  8257. it was supposed to be applied based on time since the circuit
  8258. entered its current state. Bugfix on 0.0.6; fixes part of bug 1297.
  8259. - Improve hidden service robustness: When we find that we have
  8260. extended a hidden service's introduction circuit to a relay not
  8261. listed as an introduction point in the HS descriptor we currently
  8262. have, retry with an introduction point from the current
  8263. descriptor. Previously we would just give up. Fixes bugs 1024 and
  8264. 1930; bugfix on 0.2.0.10-alpha.
  8265. - Directory authorities now use data collected from their own
  8266. uptime observations when choosing whether to assign the HSDir flag
  8267. to relays, instead of trusting the uptime value the relay reports in
  8268. its descriptor. This change helps prevent an attack where a small
  8269. set of nodes with frequently-changing identity keys can blackhole
  8270. a hidden service. (Only authorities need upgrade; others will be
  8271. fine once they do.) Bugfix on 0.2.0.10-alpha; fixes bug 2709.
  8272. - Stop assigning the HSDir flag to relays that disable their
  8273. DirPort (and thus will refuse to answer directory requests). This
  8274. fix should dramatically improve the reachability of hidden services:
  8275. hidden services and hidden service clients pick six HSDir relays
  8276. to store and retrieve the hidden service descriptor, and currently
  8277. about half of the HSDir relays will refuse to work. Bugfix on
  8278. 0.2.0.10-alpha; fixes part of bug 1693.
  8279. o Major bugfixes (misc):
  8280. - Clients now stop trying to use an exit node associated with a given
  8281. destination by TrackHostExits if they fail to reach that exit node.
  8282. Fixes bug 2999. Bugfix on 0.2.0.20-rc.
  8283. - Fix a regression that caused Tor to rebind its ports if it receives
  8284. SIGHUP while hibernating. Bugfix in 0.1.1.6-alpha; closes bug 919.
  8285. - Remove an extra pair of quotation marks around the error
  8286. message in control-port STATUS_GENERAL BUG events. Bugfix on
  8287. 0.1.2.6-alpha; fixes bug 3732.
  8288. o Minor features (relays):
  8289. - Ensure that no empty [dirreq-](read|write)-history lines are added
  8290. to an extrainfo document. Implements ticket 2497.
  8291. - When bandwidth accounting is enabled, be more generous with how
  8292. much bandwidth we'll use up before entering "soft hibernation".
  8293. Previously, we'd refuse new connections and circuits once we'd
  8294. used up 95% of our allotment. Now, we use up 95% of our allotment,
  8295. AND make sure that we have no more than 500MB (or 3 hours of
  8296. expected traffic, whichever is lower) remaining before we enter
  8297. soft hibernation.
  8298. - Relays now log the reason for publishing a new relay descriptor,
  8299. so we have a better chance of hunting down instances of bug 1810.
  8300. Resolves ticket 3252.
  8301. - Log a little more clearly about the times at which we're no longer
  8302. accepting new connections (e.g. due to hibernating). Resolves
  8303. bug 2181.
  8304. - When AllowSingleHopExits is set, print a warning to explain to the
  8305. relay operator why most clients are avoiding her relay.
  8306. - Send END_STREAM_REASON_NOROUTE in response to EHOSTUNREACH errors.
  8307. Clients before 0.2.1.27 didn't handle NOROUTE correctly, but such
  8308. clients are already deprecated because of security bugs.
  8309. o Minor features (network statistics):
  8310. - Directory mirrors that set "DirReqStatistics 1" write statistics
  8311. about directory requests to disk every 24 hours. As compared to the
  8312. "--enable-geoip-stats" ./configure flag in 0.2.1.x, there are a few
  8313. improvements: 1) stats are written to disk exactly every 24 hours;
  8314. 2) estimated shares of v2 and v3 requests are determined as mean
  8315. values, not at the end of a measurement period; 3) unresolved
  8316. requests are listed with country code '??'; 4) directories also
  8317. measure download times.
  8318. - Exit nodes that set "ExitPortStatistics 1" write statistics on the
  8319. number of exit streams and transferred bytes per port to disk every
  8320. 24 hours.
  8321. - Relays that set "CellStatistics 1" write statistics on how long
  8322. cells spend in their circuit queues to disk every 24 hours.
  8323. - Entry nodes that set "EntryStatistics 1" write statistics on the
  8324. rough number and origins of connecting clients to disk every 24
  8325. hours.
  8326. - Relays that write any of the above statistics to disk and set
  8327. "ExtraInfoStatistics 1" include the past 24 hours of statistics in
  8328. their extra-info documents. Implements proposal 166.
  8329. o Minor features (GeoIP and statistics):
  8330. - Provide a log message stating which geoip file we're parsing
  8331. instead of just stating that we're parsing the geoip file.
  8332. Implements ticket 2432.
  8333. - Make sure every relay writes a state file at least every 12 hours.
  8334. Previously, a relay could go for weeks without writing its state
  8335. file, and on a crash could lose its bandwidth history, capacity
  8336. estimates, client country statistics, and so on. Addresses bug 3012.
  8337. - Relays report the number of bytes spent on answering directory
  8338. requests in extra-info descriptors similar to {read,write}-history.
  8339. Implements enhancement 1790.
  8340. - Report only the top 10 ports in exit-port stats in order not to
  8341. exceed the maximum extra-info descriptor length of 50 KB. Implements
  8342. task 2196.
  8343. - If writing the state file to disk fails, wait up to an hour before
  8344. retrying again, rather than trying again each second. Fixes bug
  8345. 2346; bugfix on Tor 0.1.1.3-alpha.
  8346. - Delay geoip stats collection by bridges for 6 hours, not 2 hours,
  8347. when we switch from being a public relay to a bridge. Otherwise
  8348. there will still be clients that see the relay in their consensus,
  8349. and the stats will end up wrong. Bugfix on 0.2.1.15-rc; fixes
  8350. bug 932.
  8351. - Update to the August 2 2011 Maxmind GeoLite Country database.
  8352. o Minor features (clients):
  8353. - When expiring circuits, use microsecond timers rather than
  8354. one-second timers. This can avoid an unpleasant situation where a
  8355. circuit is launched near the end of one second and expired right
  8356. near the beginning of the next, and prevent fluctuations in circuit
  8357. timeout values.
  8358. - If we've configured EntryNodes and our network goes away and/or all
  8359. our entrynodes get marked down, optimistically retry them all when
  8360. a new socks application request appears. Fixes bug 1882.
  8361. - Always perform router selections using weighted relay bandwidth,
  8362. even if we don't need a high capacity circuit at the time. Non-fast
  8363. circuits now only differ from fast ones in that they can use relays
  8364. not marked with the Fast flag. This "feature" could turn out to
  8365. be a horrible bug; we should investigate more before it goes into
  8366. a stable release.
  8367. - When we run out of directory information such that we can't build
  8368. circuits, but then get enough that we can build circuits, log when
  8369. we actually construct a circuit, so the user has a better chance of
  8370. knowing what's going on. Fixes bug 1362.
  8371. - Log SSL state transitions at debug level during handshake, and
  8372. include SSL states in error messages. This may help debug future
  8373. SSL handshake issues.
  8374. o Minor features (directory authorities):
  8375. - When a router changes IP address or port, authorities now launch
  8376. a new reachability test for it. Implements ticket 1899.
  8377. - Directory authorities now reject relays running any versions of
  8378. Tor between 0.2.1.3-alpha and 0.2.1.18 inclusive; they have
  8379. known bugs that keep RELAY_EARLY cells from working on rendezvous
  8380. circuits. Followup to fix for bug 2081.
  8381. - Directory authorities now reject relays running any version of Tor
  8382. older than 0.2.0.26-rc. That version is the earliest that fetches
  8383. current directory information correctly. Fixes bug 2156.
  8384. - Directory authorities now do an immediate reachability check as soon
  8385. as they hear about a new relay. This change should slightly reduce
  8386. the time between setting up a relay and getting listed as running
  8387. in the consensus. It should also improve the time between setting
  8388. up a bridge and seeing use by bridge users.
  8389. - Directory authorities no longer launch a TLS connection to every
  8390. relay as they startup. Now that we have 2k+ descriptors cached,
  8391. the resulting network hiccup is becoming a burden. Besides,
  8392. authorities already avoid voting about Running for the first half
  8393. hour of their uptime.
  8394. - Directory authorities now log the source of a rejected POSTed v3
  8395. networkstatus vote, so we can track failures better.
  8396. - Backport code from 0.2.3.x that allows directory authorities to
  8397. clean their microdescriptor caches. Needed to resolve bug 2230.
  8398. o Minor features (hidden services):
  8399. - Use computed circuit-build timeouts to decide when to launch
  8400. parallel introduction circuits for hidden services. (Previously,
  8401. we would retry after 15 seconds.)
  8402. - Don't allow v0 hidden service authorities to act as clients.
  8403. Required by fix for bug 3000.
  8404. - Ignore SIGNAL NEWNYM commands on relay-only Tor instances. Required
  8405. by fix for bug 3000.
  8406. - Make hidden services work better in private Tor networks by not
  8407. requiring any uptime to join the hidden service descriptor
  8408. DHT. Implements ticket 2088.
  8409. - Log (at info level) when purging pieces of hidden-service-client
  8410. state because of SIGNAL NEWNYM.
  8411. o Minor features (controller interface):
  8412. - New "GETINFO net/listeners/(type)" controller command to return
  8413. a list of addresses and ports that are bound for listeners for a
  8414. given connection type. This is useful when the user has configured
  8415. "SocksPort auto" and the controller needs to know which port got
  8416. chosen. Resolves another part of ticket 3076.
  8417. - Have the controller interface give a more useful message than
  8418. "Internal Error" in response to failed GETINFO requests.
  8419. - Add a TIMEOUT_RATE keyword to the BUILDTIMEOUT_SET control port
  8420. event, to give information on the current rate of circuit timeouts
  8421. over our stored history.
  8422. - The 'EXTENDCIRCUIT' control port command can now be used with
  8423. a circ id of 0 and no path. This feature will cause Tor to build
  8424. a new 'fast' general purpose circuit using its own path selection
  8425. algorithms.
  8426. - Added a BUILDTIMEOUT_SET controller event to describe changes
  8427. to the circuit build timeout.
  8428. - New controller command "getinfo config-text". It returns the
  8429. contents that Tor would write if you send it a SAVECONF command,
  8430. so the controller can write the file to disk itself.
  8431. o Minor features (controller protocol):
  8432. - Add a new ControlSocketsGroupWritable configuration option: when
  8433. it is turned on, ControlSockets are group-writeable by the default
  8434. group of the current user. Patch by Jérémy Bobbio; implements
  8435. ticket 2972.
  8436. - Tor now refuses to create a ControlSocket in a directory that is
  8437. world-readable (or group-readable if ControlSocketsGroupWritable
  8438. is 0). This is necessary because some operating systems do not
  8439. enforce permissions on an AF_UNIX sockets. Permissions on the
  8440. directory holding the socket, however, seems to work everywhere.
  8441. - Warn when CookieAuthFileGroupReadable is set but CookieAuthFile is
  8442. not. This would lead to a cookie that is still not group readable.
  8443. Closes bug 1843. Suggested by katmagic.
  8444. - Future-proof the controller protocol a bit by ignoring keyword
  8445. arguments we do not recognize.
  8446. o Minor features (more useful logging):
  8447. - Revise most log messages that refer to nodes by nickname to
  8448. instead use the "$key=nickname at address" format. This should be
  8449. more useful, especially since nicknames are less and less likely
  8450. to be unique. Resolves ticket 3045.
  8451. - When an HTTPS proxy reports "403 Forbidden", we now explain
  8452. what it means rather than calling it an unexpected status code.
  8453. Closes bug 2503. Patch from Michael Yakubovich.
  8454. - Rate-limit a warning about failures to download v2 networkstatus
  8455. documents. Resolves part of bug 1352.
  8456. - Rate-limit the "your application is giving Tor only an IP address"
  8457. warning. Addresses bug 2000; bugfix on 0.0.8pre2.
  8458. - Rate-limit "Failed to hand off onionskin" warnings.
  8459. - When logging a rate-limited warning, we now mention how many messages
  8460. got suppressed since the last warning.
  8461. - Make the formerly ugly "2 unknown, 7 missing key, 0 good, 0 bad,
  8462. 2 no signature, 4 required" messages about consensus signatures
  8463. easier to read, and make sure they get logged at the same severity
  8464. as the messages explaining which keys are which. Fixes bug 1290.
  8465. - Don't warn when we have a consensus that we can't verify because
  8466. of missing certificates, unless those certificates are ones
  8467. that we have been trying and failing to download. Fixes bug 1145.
  8468. o Minor features (log domains):
  8469. - Add documentation for configuring logging at different severities in
  8470. different log domains. We've had this feature since 0.2.1.1-alpha,
  8471. but for some reason it never made it into the manpage. Fixes
  8472. bug 2215.
  8473. - Make it simpler to specify "All log domains except for A and B".
  8474. Previously you needed to say "[*,~A,~B]". Now you can just say
  8475. "[~A,~B]".
  8476. - Add a "LogMessageDomains 1" option to include the domains of log
  8477. messages along with the messages. Without this, there's no way
  8478. to use log domains without reading the source or doing a lot
  8479. of guessing.
  8480. - Add a new "Handshake" log domain for activities that happen
  8481. during the TLS handshake.
  8482. o Minor features (build process):
  8483. - Make compilation with clang possible when using
  8484. "--enable-gcc-warnings" by removing two warning options that clang
  8485. hasn't implemented yet and by fixing a few warnings. Resolves
  8486. ticket 2696.
  8487. - Detect platforms that brokenly use a signed size_t, and refuse to
  8488. build there. Found and analyzed by doorss and rransom.
  8489. - Fix a bunch of compile warnings revealed by mingw with gcc 4.5.
  8490. Resolves bug 2314.
  8491. - Add support for statically linking zlib by specifying
  8492. "--enable-static-zlib", to go with our support for statically
  8493. linking openssl and libevent. Resolves bug 1358.
  8494. - Instead of adding the svn revision to the Tor version string, report
  8495. the git commit (when we're building from a git checkout).
  8496. - Rename the "log.h" header to "torlog.h" so as to conflict with fewer
  8497. system headers.
  8498. - New --digests command-line switch to output the digests of the
  8499. source files Tor was built with.
  8500. - Generate our manpage and HTML documentation using Asciidoc. This
  8501. change should make it easier to maintain the documentation, and
  8502. produce nicer HTML. The build process fails if asciidoc cannot
  8503. be found and building with asciidoc isn't disabled (via the
  8504. "--disable-asciidoc" argument to ./configure. Skipping the manpage
  8505. speeds up the build considerably.
  8506. o Minor features (options / torrc):
  8507. - Warn when the same option is provided more than once in a torrc
  8508. file, on the command line, or in a single SETCONF statement, and
  8509. the option is one that only accepts a single line. Closes bug 1384.
  8510. - Warn when the user configures two HiddenServiceDir lines that point
  8511. to the same directory. Bugfix on 0.0.6 (the version introducing
  8512. HiddenServiceDir); fixes bug 3289.
  8513. - Add new "perconnbwrate" and "perconnbwburst" consensus params to
  8514. do individual connection-level rate limiting of clients. The torrc
  8515. config options with the same names trump the consensus params, if
  8516. both are present. Replaces the old "bwconnrate" and "bwconnburst"
  8517. consensus params which were broken from 0.2.2.7-alpha through
  8518. 0.2.2.14-alpha. Closes bug 1947.
  8519. - New config option "WarnUnsafeSocks 0" disables the warning that
  8520. occurs whenever Tor receives a socks handshake using a version of
  8521. the socks protocol that can only provide an IP address (rather
  8522. than a hostname). Setups that do DNS locally over Tor are fine,
  8523. and we shouldn't spam the logs in that case.
  8524. - New config option "CircuitStreamTimeout" to override our internal
  8525. timeout schedule for how many seconds until we detach a stream from
  8526. a circuit and try a new circuit. If your network is particularly
  8527. slow, you might want to set this to a number like 60.
  8528. - New options for SafeLogging to allow scrubbing only log messages
  8529. generated while acting as a relay. Specify "SafeLogging relay" if
  8530. you want to ensure that only messages known to originate from
  8531. client use of the Tor process will be logged unsafely.
  8532. - Time and memory units in the configuration file can now be set to
  8533. fractional units. For example, "2.5 GB" is now a valid value for
  8534. AccountingMax.
  8535. - Support line continuations in the torrc config file. If a line
  8536. ends with a single backslash character, the newline is ignored, and
  8537. the configuration value is treated as continuing on the next line.
  8538. Resolves bug 1929.
  8539. o Minor features (unit tests):
  8540. - Revise our unit tests to use the "tinytest" framework, so we
  8541. can run tests in their own processes, have smarter setup/teardown
  8542. code, and so on. The unit test code has moved to its own
  8543. subdirectory, and has been split into multiple modules.
  8544. - Add a unit test for cross-platform directory-listing code.
  8545. - Add some forgotten return value checks during unit tests. Found
  8546. by coverity.
  8547. - Use GetTempDir to find the proper temporary directory location on
  8548. Windows when generating temporary files for the unit tests. Patch
  8549. by Gisle Vanem.
  8550. o Minor features (misc):
  8551. - The "torify" script now uses torsocks where available.
  8552. - Make Libevent log messages get delivered to controllers later,
  8553. and not from inside the Libevent log handler. This prevents unsafe
  8554. reentrant Libevent calls while still letting the log messages
  8555. get through.
  8556. - Certain Tor clients (such as those behind check.torproject.org) may
  8557. want to fetch the consensus in an extra early manner. To enable this
  8558. a user may now set FetchDirInfoExtraEarly to 1. This also depends on
  8559. setting FetchDirInfoEarly to 1. Previous behavior will stay the same
  8560. as only certain clients who must have this information sooner should
  8561. set this option.
  8562. - Expand homedirs passed to tor-checkkey. This should silence a
  8563. coverity complaint about passing a user-supplied string into
  8564. open() without checking it.
  8565. - Make sure to disable DirPort if running as a bridge. DirPorts aren't
  8566. used on bridges, and it makes bridge scanning somewhat easier.
  8567. - Create the /var/run/tor directory on startup on OpenSUSE if it is
  8568. not already created. Patch from Andreas Stieger. Fixes bug 2573.
  8569. o Minor bugfixes (relays):
  8570. - When a relay decides that its DNS is too broken for it to serve
  8571. as an exit server, it advertised itself as a non-exit, but
  8572. continued to act as an exit. This could create accidental
  8573. partitioning opportunities for users. Instead, if a relay is
  8574. going to advertise reject *:* as its exit policy, it should
  8575. really act with exit policy "reject *:*". Fixes bug 2366.
  8576. Bugfix on Tor 0.1.2.5-alpha. Bugfix by user "postman" on trac.
  8577. - Publish a router descriptor even if generating an extra-info
  8578. descriptor fails. Previously we would not publish a router
  8579. descriptor without an extra-info descriptor; this can cause fast
  8580. exit relays collecting exit-port statistics to drop from the
  8581. consensus. Bugfix on 0.1.2.9-rc; fixes bug 2195.
  8582. - When we're trying to guess whether we know our IP address as
  8583. a relay, we would log various ways that we failed to guess
  8584. our address, but never log that we ended up guessing it
  8585. successfully. Now add a log line to help confused and anxious
  8586. relay operators. Bugfix on 0.1.2.1-alpha; fixes bug 1534.
  8587. - For bandwidth accounting, calculate our expected bandwidth rate
  8588. based on the time during which we were active and not in
  8589. soft-hibernation during the last interval. Previously, we were
  8590. also considering the time spent in soft-hibernation. If this
  8591. was a long time, we would wind up underestimating our bandwidth
  8592. by a lot, and skewing our wakeup time towards the start of the
  8593. accounting interval. Fixes bug 1789. Bugfix on 0.0.9pre5.
  8594. - Demote a confusing TLS warning that relay operators might get when
  8595. someone tries to talk to their ORPort. It is not the operator's
  8596. fault, nor can they do anything about it. Fixes bug 1364; bugfix
  8597. on 0.2.0.14-alpha.
  8598. - Change "Application request when we're believed to be offline."
  8599. notice to "Application request when we haven't used client
  8600. functionality lately.", to clarify that it's not an error. Bugfix
  8601. on 0.0.9.3; fixes bug 1222.
  8602. o Minor bugfixes (bridges):
  8603. - When a client starts or stops using bridges, never use a circuit
  8604. that was built before the configuration change. This behavior could
  8605. put at risk a user who uses bridges to ensure that her traffic
  8606. only goes to the chosen addresses. Bugfix on 0.2.0.3-alpha; fixes
  8607. bug 3200.
  8608. - Do not reset the bridge descriptor download status every time we
  8609. re-parse our configuration or get a configuration change. Fixes
  8610. bug 3019; bugfix on 0.2.0.3-alpha.
  8611. - Users couldn't configure a regular relay to be their bridge. It
  8612. didn't work because when Tor fetched the bridge descriptor, it found
  8613. that it already had it, and didn't realize that the purpose of the
  8614. descriptor had changed. Now we replace routers with a purpose other
  8615. than bridge with bridge descriptors when fetching them. Bugfix on
  8616. 0.1.1.9-alpha. Fixes bug 1776.
  8617. - In the special case where you configure a public exit relay as your
  8618. bridge, Tor would be willing to use that exit relay as the last
  8619. hop in your circuit as well. Now we fail that circuit instead.
  8620. Bugfix on 0.2.0.12-alpha. Fixes bug 2403. Reported by "piebeer".
  8621. o Minor bugfixes (clients):
  8622. - We now ask the other side of a stream (the client or the exit)
  8623. for more data on that stream when the amount of queued data on
  8624. that stream dips low enough. Previously, we wouldn't ask the
  8625. other side for more data until either it sent us more data (which
  8626. it wasn't supposed to do if it had exhausted its window!) or we
  8627. had completely flushed all our queued data. This flow control fix
  8628. should improve throughput. Fixes bug 2756; bugfix on the earliest
  8629. released versions of Tor (svn commit r152).
  8630. - When a client finds that an origin circuit has run out of 16-bit
  8631. stream IDs, we now mark it as unusable for new streams. Previously,
  8632. we would try to close the entire circuit. Bugfix on 0.0.6.
  8633. - Make it explicit that we don't cannibalize one-hop circuits. This
  8634. happens in the wild, but doesn't turn out to be a problem because
  8635. we fortunately don't use those circuits. Many thanks to outofwords
  8636. for the initial analysis and to swissknife who confirmed that
  8637. two-hop circuits are actually created.
  8638. - Resolve an edge case in path weighting that could make us misweight
  8639. our relay selection. Fixes bug 1203; bugfix on 0.0.8rc1.
  8640. - Make the DNSPort option work with libevent 2.x. Don't alter the
  8641. behavior for libevent 1.x. Fixes bug 1143. Found by SwissTorExit.
  8642. o Minor bugfixes (directory authorities):
  8643. - Make directory authorities more accurate at recording when
  8644. relays that have failed several reachability tests became
  8645. unreachable, so we can provide more accuracy at assigning Stable,
  8646. Guard, HSDir, etc flags. Bugfix on 0.2.0.6-alpha. Resolves bug 2716.
  8647. - Directory authorities are now more robust to hops back in time
  8648. when calculating router stability. Previously, if a run of uptime
  8649. or downtime appeared to be negative, the calculation could give
  8650. incorrect results. Bugfix on 0.2.0.6-alpha; noticed when fixing
  8651. bug 1035.
  8652. - Directory authorities will now attempt to download consensuses
  8653. if their own efforts to make a live consensus have failed. This
  8654. change means authorities that restart will fetch a valid
  8655. consensus, and it means authorities that didn't agree with the
  8656. current consensus will still fetch and serve it if it has enough
  8657. signatures. Bugfix on 0.2.0.9-alpha; fixes bug 1300.
  8658. - Never vote for a server as "Running" if we have a descriptor for
  8659. it claiming to be hibernating, and that descriptor was published
  8660. more recently than our last contact with the server. Bugfix on
  8661. 0.2.0.3-alpha; fixes bug 911.
  8662. - Directory authorities no longer change their opinion of, or vote on,
  8663. whether a router is Running, unless they have themselves been
  8664. online long enough to have some idea. Bugfix on 0.2.0.6-alpha.
  8665. Fixes bug 1023.
  8666. o Minor bugfixes (hidden services):
  8667. - Log malformed requests for rendezvous descriptors as protocol
  8668. warnings, not warnings. Also, use a more informative log message
  8669. in case someone sees it at log level warning without prior
  8670. info-level messages. Fixes bug 2748; bugfix on 0.2.0.10-alpha.
  8671. - Accept hidden service descriptors if we think we might be a hidden
  8672. service directory, regardless of what our consensus says. This
  8673. helps robustness, since clients and hidden services can sometimes
  8674. have a more up-to-date view of the network consensus than we do,
  8675. and if they think that the directory authorities list us a HSDir,
  8676. we might actually be one. Related to bug 2732; bugfix on
  8677. 0.2.0.10-alpha.
  8678. - Correct the warning displayed when a rendezvous descriptor exceeds
  8679. the maximum size. Fixes bug 2750; bugfix on 0.2.1.5-alpha. Found by
  8680. John Brooks.
  8681. - Clients and hidden services now use HSDir-flagged relays for hidden
  8682. service descriptor downloads and uploads even if the relays have no
  8683. DirPort set and the client has disabled TunnelDirConns. This will
  8684. eventually allow us to give the HSDir flag to relays with no
  8685. DirPort. Fixes bug 2722; bugfix on 0.2.1.6-alpha.
  8686. - Only limit the lengths of single HS descriptors, even when multiple
  8687. HS descriptors are published to an HSDir relay in a single POST
  8688. operation. Fixes bug 2948; bugfix on 0.2.1.5-alpha. Found by hsdir.
  8689. o Minor bugfixes (controllers):
  8690. - Allow GETINFO fingerprint to return a fingerprint even when
  8691. we have not yet built a router descriptor. Fixes bug 3577;
  8692. bugfix on 0.2.0.1-alpha.
  8693. - Send a SUCCEEDED stream event to the controller when a reverse
  8694. resolve succeeded. Fixes bug 3536; bugfix on 0.0.8pre1. Issue
  8695. discovered by katmagic.
  8696. - Remove a trailing asterisk from "exit-policy/default" in the
  8697. output of the control port command "GETINFO info/names". Bugfix
  8698. on 0.1.2.5-alpha.
  8699. - Make the SIGNAL DUMP controller command work on FreeBSD. Fixes bug
  8700. 2917. Bugfix on 0.1.1.1-alpha.
  8701. - When we restart our relay, we might get a successful connection
  8702. from the outside before we've started our reachability tests,
  8703. triggering a warning: "ORPort found reachable, but I have no
  8704. routerinfo yet. Failing to inform controller of success." This
  8705. bug was harmless unless Tor is running under a controller
  8706. like Vidalia, in which case the controller would never get a
  8707. REACHABILITY_SUCCEEDED status event. Bugfix on 0.1.2.6-alpha;
  8708. fixes bug 1172.
  8709. - When a controller changes TrackHostExits, remove mappings for
  8710. hosts that should no longer have their exits tracked. Bugfix on
  8711. 0.1.0.1-rc.
  8712. - When a controller changes VirtualAddrNetwork, remove any mappings
  8713. for hosts that were automapped to the old network. Bugfix on
  8714. 0.1.1.19-rc.
  8715. - When a controller changes one of the AutomapHosts* options, remove
  8716. any mappings for hosts that should no longer be automapped. Bugfix
  8717. on 0.2.0.1-alpha.
  8718. - Fix an off-by-one error in calculating some controller command
  8719. argument lengths. Fortunately, this mistake is harmless since
  8720. the controller code does redundant NUL termination too. Found by
  8721. boboper. Bugfix on 0.1.1.1-alpha.
  8722. - Fix a bug in the controller interface where "GETINFO ns/asdaskljkl"
  8723. would return "551 Internal error" rather than "552 Unrecognized key
  8724. ns/asdaskljkl". Bugfix on 0.1.2.3-alpha.
  8725. - Don't spam the controller with events when we have no file
  8726. descriptors available. Bugfix on 0.2.1.5-alpha. (Rate-limiting
  8727. for log messages was already solved from bug 748.)
  8728. - Emit a GUARD DROPPED controller event for a case we missed.
  8729. - Ensure DNS requests launched by "RESOLVE" commands from the
  8730. controller respect the __LeaveStreamsUnattached setconf options. The
  8731. same goes for requests launched via DNSPort or transparent
  8732. proxying. Bugfix on 0.2.0.1-alpha; fixes bug 1525.
  8733. o Minor bugfixes (config options):
  8734. - Tor used to limit HttpProxyAuthenticator values to 48 characters.
  8735. Change the limit to 512 characters by removing base64 newlines.
  8736. Fixes bug 2752. Fix by Michael Yakubovich.
  8737. - Complain if PublishServerDescriptor is given multiple arguments that
  8738. include 0 or 1. This configuration will be rejected in the future.
  8739. Bugfix on 0.2.0.1-alpha; closes bug 1107.
  8740. - Disallow BridgeRelay 1 and ORPort 0 at once in the configuration.
  8741. Bugfix on 0.2.0.13-alpha; closes bug 928.
  8742. o Minor bugfixes (log subsystem fixes):
  8743. - When unable to format an address as a string, report its value
  8744. as "???" rather than reusing the last formatted address. Bugfix
  8745. on 0.2.1.5-alpha.
  8746. - Be more consistent in our treatment of file system paths. "~" should
  8747. get expanded to the user's home directory in the Log config option.
  8748. Fixes bug 2971; bugfix on 0.2.0.1-alpha, which introduced the
  8749. feature for the -f and --DataDirectory options.
  8750. o Minor bugfixes (memory management):
  8751. - Don't stack-allocate the list of supplementary GIDs when we're
  8752. about to log them. Stack-allocating NGROUPS_MAX gid_t elements
  8753. could take up to 256K, which is way too much stack. Found by
  8754. Coverity; CID #450. Bugfix on 0.2.1.7-alpha.
  8755. - Save a couple bytes in memory allocation every time we escape
  8756. certain characters in a string. Patch from Florian Zumbiehl.
  8757. o Minor bugfixes (protocol correctness):
  8758. - When checking for 1024-bit keys, check for 1024 bits, not 128
  8759. bytes. This allows Tor to correctly discard keys of length 1017
  8760. through 1023. Bugfix on 0.0.9pre5.
  8761. - Require that introduction point keys and onion handshake keys
  8762. have a public exponent of 65537. Starts to fix bug 3207; bugfix
  8763. on 0.2.0.10-alpha.
  8764. - Handle SOCKS messages longer than 128 bytes long correctly, rather
  8765. than waiting forever for them to finish. Fixes bug 2330; bugfix
  8766. on 0.2.0.16-alpha. Found by doorss.
  8767. - Never relay a cell for a circuit we have already destroyed.
  8768. Between marking a circuit as closeable and finally closing it,
  8769. it may have been possible for a few queued cells to get relayed,
  8770. even though they would have been immediately dropped by the next
  8771. OR in the circuit. Fixes bug 1184; bugfix on 0.2.0.1-alpha.
  8772. - Never queue a cell for a circuit that's already been marked
  8773. for close.
  8774. - Fix a spec conformance issue: the network-status-version token
  8775. must be the first token in a v3 consensus or vote. Discovered by
  8776. "parakeep". Bugfix on 0.2.0.3-alpha.
  8777. - A networkstatus vote must contain exactly one signature. Spec
  8778. conformance issue. Bugfix on 0.2.0.3-alpha.
  8779. - When asked about a DNS record type we don't support via a
  8780. client DNSPort, reply with NOTIMPL rather than an empty
  8781. reply. Patch by intrigeri. Fixes bug 3369; bugfix on 2.0.1-alpha.
  8782. - Make more fields in the controller protocol case-insensitive, since
  8783. control-spec.txt said they were.
  8784. o Minor bugfixes (log messages):
  8785. - Fix a log message that said "bits" while displaying a value in
  8786. bytes. Found by wanoskarnet. Fixes bug 3318; bugfix on
  8787. 0.2.0.1-alpha.
  8788. - Downgrade "no current certificates known for authority" message from
  8789. Notice to Info. Fixes bug 2899; bugfix on 0.2.0.10-alpha.
  8790. - Correctly describe errors that occur when generating a TLS object.
  8791. Previously we would attribute them to a failure while generating a
  8792. TLS context. Patch by Robert Ransom. Bugfix on 0.1.0.4-rc; fixes
  8793. bug 1994.
  8794. - Fix an instance where a Tor directory mirror might accidentally
  8795. log the IP address of a misbehaving Tor client. Bugfix on
  8796. 0.1.0.1-rc.
  8797. - Stop logging at severity 'warn' when some other Tor client tries
  8798. to establish a circuit with us using weak DH keys. It's a protocol
  8799. violation, but that doesn't mean ordinary users need to hear about
  8800. it. Fixes the bug part of bug 1114. Bugfix on 0.1.0.13.
  8801. - If your relay can't keep up with the number of incoming create
  8802. cells, it would log one warning per failure into your logs. Limit
  8803. warnings to 1 per minute. Bugfix on 0.0.2pre10; fixes bug 1042.
  8804. o Minor bugfixes (build fixes):
  8805. - Fix warnings from GCC 4.6's "-Wunused-but-set-variable" option.
  8806. - When warning about missing zlib development packages during compile,
  8807. give the correct package names. Bugfix on 0.2.0.1-alpha.
  8808. - Fix warnings that newer versions of autoconf produce during
  8809. ./autogen.sh. These warnings appear to be harmless in our case,
  8810. but they were extremely verbose. Fixes bug 2020.
  8811. - Squash a compile warning on OpenBSD. Reported by Tas; fixes
  8812. bug 1848.
  8813. o Minor bugfixes (portability):
  8814. - Write several files in text mode, on OSes that distinguish text
  8815. mode from binary mode (namely, Windows). These files are:
  8816. 'buffer-stats', 'dirreq-stats', and 'entry-stats' on relays
  8817. that collect those statistics; 'client_keys' and 'hostname' for
  8818. hidden services that use authentication; and (in the tor-gencert
  8819. utility) newly generated identity and signing keys. Previously,
  8820. we wouldn't specify text mode or binary mode, leading to an
  8821. assertion failure. Fixes bug 3607. Bugfix on 0.2.1.1-alpha (when
  8822. the DirRecordUsageByCountry option which would have triggered
  8823. the assertion failure was added), although this assertion failure
  8824. would have occurred in tor-gencert on Windows in 0.2.0.1-alpha.
  8825. - Selectively disable deprecation warnings on OS X because Lion
  8826. started deprecating the shipped copy of openssl. Fixes bug 3643.
  8827. - Use a wide type to hold sockets when built for 64-bit Windows.
  8828. Fixes bug 3270.
  8829. - Fix an issue that prevented static linking of libevent on
  8830. some platforms (notably Linux). Fixes bug 2698; bugfix on 0.2.1.23,
  8831. where we introduced the "--with-static-libevent" configure option.
  8832. - Fix a bug with our locking implementation on Windows that couldn't
  8833. correctly detect when a file was already locked. Fixes bug 2504,
  8834. bugfix on 0.2.1.6-alpha.
  8835. - Build correctly on OSX with zlib 1.2.4 and higher with all warnings
  8836. enabled.
  8837. - Fix IPv6-related connect() failures on some platforms (BSD, OS X).
  8838. Bugfix on 0.2.0.3-alpha; fixes first part of bug 2660. Patch by
  8839. "piebeer".
  8840. o Minor bugfixes (code correctness):
  8841. - Always NUL-terminate the sun_path field of a sockaddr_un before
  8842. passing it to the kernel. (Not a security issue: kernels are
  8843. smart enough to reject bad sockaddr_uns.) Found by Coverity;
  8844. CID #428. Bugfix on Tor 0.2.0.3-alpha.
  8845. - Make connection_printf_to_buf()'s behavior sane. Its callers
  8846. expect it to emit a CRLF iff the format string ends with CRLF;
  8847. it actually emitted a CRLF iff (a) the format string ended with
  8848. CRLF or (b) the resulting string was over 1023 characters long or
  8849. (c) the format string did not end with CRLF *and* the resulting
  8850. string was 1021 characters long or longer. Bugfix on 0.1.1.9-alpha;
  8851. fixes part of bug 3407.
  8852. - Make send_control_event_impl()'s behavior sane. Its callers
  8853. expect it to always emit a CRLF at the end of the string; it
  8854. might have emitted extra control characters as well. Bugfix on
  8855. 0.1.1.9-alpha; fixes another part of bug 3407.
  8856. - Make crypto_rand_int() check the value of its input correctly.
  8857. Previously, it accepted values up to UINT_MAX, but could return a
  8858. negative number if given a value above INT_MAX+1. Found by George
  8859. Kadianakis. Fixes bug 3306; bugfix on 0.2.2pre14.
  8860. - Fix a potential null-pointer dereference while computing a
  8861. consensus. Bugfix on 0.2.0.3-alpha, found with the help of
  8862. clang's analyzer.
  8863. - If we fail to compute the identity digest of a v3 legacy keypair,
  8864. warn, and don't use a buffer-full of junk instead. Bugfix on
  8865. 0.2.1.1-alpha; fixes bug 3106.
  8866. - Resolve an untriggerable issue in smartlist_string_num_isin(),
  8867. where if the function had ever in the future been used to check
  8868. for the presence of a too-large number, it would have given an
  8869. incorrect result. (Fortunately, we only used it for 16-bit
  8870. values.) Fixes bug 3175; bugfix on 0.1.0.1-rc.
  8871. - Be more careful about reporting the correct error from a failed
  8872. connect() system call. Under some circumstances, it was possible to
  8873. look at an incorrect value for errno when sending the end reason.
  8874. Bugfix on 0.1.0.1-rc.
  8875. - Correctly handle an "impossible" overflow cases in connection byte
  8876. counting, where we write or read more than 4GB on an edge connection
  8877. in a single second. Bugfix on 0.1.2.8-beta.
  8878. - Avoid a double mark-for-free warning when failing to attach a
  8879. transparent proxy connection. Bugfix on 0.1.2.1-alpha. Fixes
  8880. bug 2279.
  8881. - Correctly detect failure to allocate an OpenSSL BIO. Fixes bug 2378;
  8882. found by "cypherpunks". This bug was introduced before the first
  8883. Tor release, in svn commit r110.
  8884. - Fix a bug in bandwidth history state parsing that could have been
  8885. triggered if a future version of Tor ever changed the timing
  8886. granularity at which bandwidth history is measured. Bugfix on
  8887. Tor 0.1.1.11-alpha.
  8888. - Add assertions to check for overflow in arguments to
  8889. base32_encode() and base32_decode(); fix a signed-unsigned
  8890. comparison there too. These bugs are not actually reachable in Tor,
  8891. but it's good to prevent future errors too. Found by doorss.
  8892. - Avoid a bogus overlapped memcpy in tor_addr_copy(). Reported by
  8893. "memcpyfail".
  8894. - Set target port in get_interface_address6() correctly. Bugfix
  8895. on 0.1.1.4-alpha and 0.2.0.3-alpha; fixes second part of bug 2660.
  8896. - Fix an impossible-to-actually-trigger buffer overflow in relay
  8897. descriptor generation. Bugfix on 0.1.0.15.
  8898. - Fix numerous small code-flaws found by Coverity Scan Rung 3.
  8899. o Minor bugfixes (code improvements):
  8900. - After we free an internal connection structure, overwrite it
  8901. with a different memory value than we use for overwriting a freed
  8902. internal circuit structure. Should help with debugging. Suggested
  8903. by bug 1055.
  8904. - If OpenSSL fails to make a duplicate of a private or public key, log
  8905. an error message and try to exit cleanly. May help with debugging
  8906. if bug 1209 ever remanifests.
  8907. - Some options used different conventions for uppercasing of acronyms
  8908. when comparing manpage and source. Fix those in favor of the
  8909. manpage, as it makes sense to capitalize acronyms.
  8910. - Take a first step towards making or.h smaller by splitting out
  8911. function definitions for all source files in src/or/. Leave
  8912. structures and defines in or.h for now.
  8913. - Remove a few dead assignments during router parsing. Found by
  8914. coverity.
  8915. - Don't use 1-bit wide signed bit fields. Found by coverity.
  8916. - Avoid signed/unsigned comparisons by making SIZE_T_CEILING unsigned.
  8917. None of the cases where we did this before were wrong, but by making
  8918. this change we avoid warnings. Fixes bug 2475; bugfix on 0.2.1.28.
  8919. - The memarea code now uses a sentinel value at the end of each area
  8920. to make sure nothing writes beyond the end of an area. This might
  8921. help debug some conceivable causes of bug 930.
  8922. - Always treat failure to allocate an RSA key as an unrecoverable
  8923. allocation error.
  8924. - Add some more defensive programming for architectures that can't
  8925. handle unaligned integer accesses. We don't know of any actual bugs
  8926. right now, but that's the best time to fix them. Fixes bug 1943.
  8927. o Minor bugfixes (misc):
  8928. - Fix a rare bug in rend_fn unit tests: we would fail a test when
  8929. a randomly generated port is 0. Diagnosed by Matt Edman. Bugfix
  8930. on 0.2.0.10-alpha; fixes bug 1808.
  8931. - Where available, use Libevent 2.0's periodic timers so that our
  8932. once-per-second cleanup code gets called even more closely to
  8933. once per second than it would otherwise. Fixes bug 943.
  8934. - Ignore OutboundBindAddress when connecting to localhost.
  8935. Connections to localhost need to come _from_ localhost, or else
  8936. local servers (like DNS and outgoing HTTP/SOCKS proxies) will often
  8937. refuse to listen.
  8938. - Update our OpenSSL 0.9.8l fix so that it works with OpenSSL 0.9.8m
  8939. too.
  8940. - If any of the v3 certs we download are unparseable, we should
  8941. actually notice the failure so we don't retry indefinitely. Bugfix
  8942. on 0.2.0.x; reported by "rotator".
  8943. - When Tor fails to parse a descriptor of any kind, dump it to disk.
  8944. Might help diagnosing bug 1051.
  8945. - Make our 'torify' script more portable; if we have only one of
  8946. 'torsocks' or 'tsocks' installed, don't complain to the user;
  8947. and explain our warning about tsocks better.
  8948. - Fix some urls in the exit notice file and make it XHTML1.1 strict
  8949. compliant. Based on a patch from Christian Kujau.
  8950. o Documentation changes:
  8951. - Modernize the doxygen configuration file slightly. Fixes bug 2707.
  8952. - Resolve all doxygen warnings except those for missing documentation.
  8953. Fixes bug 2705.
  8954. - Add doxygen documentation for more functions, fields, and types.
  8955. - Convert the HACKING file to asciidoc, and add a few new sections
  8956. to it, explaining how we use Git, how we make changelogs, and
  8957. what should go in a patch.
  8958. - Document the default socks host and port (127.0.0.1:9050) for
  8959. tor-resolve.
  8960. - Removed some unnecessary files from the source distribution. The
  8961. AUTHORS file has now been merged into the people page on the
  8962. website. The roadmaps and design doc can now be found in the
  8963. projects directory in svn.
  8964. o Deprecated and removed features (config):
  8965. - Remove the torrc.complete file. It hasn't been kept up to date
  8966. and users will have better luck checking out the manpage.
  8967. - Remove the HSAuthorityRecordStats option that version 0 hidden
  8968. service authorities could use to track statistics of overall v0
  8969. hidden service usage.
  8970. - Remove the obsolete "NoPublish" option; it has been flagged
  8971. as obsolete and has produced a warning since 0.1.1.18-rc.
  8972. - Caches no longer download and serve v2 networkstatus documents
  8973. unless FetchV2Networkstatus flag is set: these documents haven't
  8974. haven't been used by clients or relays since 0.2.0.x. Resolves
  8975. bug 3022.
  8976. o Deprecated and removed features (controller):
  8977. - The controller no longer accepts the old obsolete "addr-mappings/"
  8978. or "unregistered-servers-" GETINFO values.
  8979. - The EXTENDED_EVENTS and VERBOSE_NAMES controller features are now
  8980. always on; using them is necessary for correct forward-compatible
  8981. controllers.
  8982. o Deprecated and removed features (misc):
  8983. - Hidden services no longer publish version 0 descriptors, and clients
  8984. do not request or use version 0 descriptors. However, the old hidden
  8985. service authorities still accept and serve version 0 descriptors
  8986. when contacted by older hidden services/clients.
  8987. - Remove undocumented option "-F" from tor-resolve: it hasn't done
  8988. anything since 0.2.1.16-rc.
  8989. - Remove everything related to building the expert bundle for OS X.
  8990. It has confused many users, doesn't work right on OS X 10.6,
  8991. and is hard to get rid of once installed. Resolves bug 1274.
  8992. - Remove support for .noconnect style addresses. Nobody was using
  8993. them, and they provided another avenue for detecting Tor users
  8994. via application-level web tricks.
  8995. - When we fixed bug 1038 we had to put in a restriction not to send
  8996. RELAY_EARLY cells on rend circuits. This was necessary as long
  8997. as relays using Tor 0.2.1.3-alpha through 0.2.1.18-alpha were
  8998. active. Now remove this obsolete check. Resolves bug 2081.
  8999. - Remove workaround code to handle directory responses from servers
  9000. that had bug 539 (they would send HTTP status 503 responses _and_
  9001. send a body too). Since only server versions before
  9002. 0.2.0.16-alpha/0.1.2.19 were affected, there is no longer reason to
  9003. keep the workaround in place.
  9004. - Remove the old 'fuzzy time' logic. It was supposed to be used for
  9005. handling calculations where we have a known amount of clock skew and
  9006. an allowed amount of unknown skew. But we only used it in three
  9007. places, and we never adjusted the known/unknown skew values. This is
  9008. still something we might want to do someday, but if we do, we'll
  9009. want to do it differently.
  9010. - Remove the "--enable-iphone" option to ./configure. According to
  9011. reports from Marco Bonetti, Tor builds fine without any special
  9012. tweaking on recent iPhone SDK versions.
  9013. Changes in version 0.2.1.30 - 2011-02-23
  9014. Tor 0.2.1.30 fixes a variety of less critical bugs. The main other
  9015. change is a slight tweak to Tor's TLS handshake that makes relays
  9016. and bridges that run this new version reachable from Iran again.
  9017. We don't expect this tweak will win the arms race long-term, but it
  9018. buys us time until we roll out a better solution.
  9019. o Major bugfixes:
  9020. - Stop sending a CLOCK_SKEW controller status event whenever
  9021. we fetch directory information from a relay that has a wrong clock.
  9022. Instead, only inform the controller when it's a trusted authority
  9023. that claims our clock is wrong. Bugfix on 0.1.2.6-alpha; fixes
  9024. the rest of bug 1074.
  9025. - Fix a bounds-checking error that could allow an attacker to
  9026. remotely crash a directory authority. Bugfix on 0.2.1.5-alpha.
  9027. Found by "piebeer".
  9028. - If relays set RelayBandwidthBurst but not RelayBandwidthRate,
  9029. Tor would ignore their RelayBandwidthBurst setting,
  9030. potentially using more bandwidth than expected. Bugfix on
  9031. 0.2.0.1-alpha. Reported by Paul Wouters. Fixes bug 2470.
  9032. - Ignore and warn if the user mistakenly sets "PublishServerDescriptor
  9033. hidserv" in her torrc. The 'hidserv' argument never controlled
  9034. publication of hidden service descriptors. Bugfix on 0.2.0.1-alpha.
  9035. o Minor features:
  9036. - Adjust our TLS Diffie-Hellman parameters to match those used by
  9037. Apache's mod_ssl.
  9038. - Update to the February 1 2011 Maxmind GeoLite Country database.
  9039. o Minor bugfixes:
  9040. - Check for and reject overly long directory certificates and
  9041. directory tokens before they have a chance to hit any assertions.
  9042. Bugfix on 0.2.1.28. Found by "doorss".
  9043. - Bring the logic that gathers routerinfos and assesses the
  9044. acceptability of circuits into line. This prevents a Tor OP from
  9045. getting locked in a cycle of choosing its local OR as an exit for a
  9046. path (due to a .exit request) and then rejecting the circuit because
  9047. its OR is not listed yet. It also prevents Tor clients from using an
  9048. OR running in the same instance as an exit (due to a .exit request)
  9049. if the OR does not meet the same requirements expected of an OR
  9050. running elsewhere. Fixes bug 1859; bugfix on 0.1.0.1-rc.
  9051. o Packaging changes:
  9052. - Stop shipping the Tor specs files and development proposal documents
  9053. in the tarball. They are now in a separate git repository at
  9054. git://git.torproject.org/torspec.git
  9055. - Do not include Git version tags as though they are SVN tags when
  9056. generating a tarball from inside a repository that has switched
  9057. between branches. Bugfix on 0.2.1.15-rc; fixes bug 2402.
  9058. Changes in version 0.2.1.29 - 2011-01-15
  9059. Tor 0.2.1.29 continues our recent code security audit work. The main
  9060. fix resolves a remote heap overflow vulnerability that can allow remote
  9061. code execution. Other fixes address a variety of assert and crash bugs,
  9062. most of which we think are hard to exploit remotely.
  9063. o Major bugfixes (security):
  9064. - Fix a heap overflow bug where an adversary could cause heap
  9065. corruption. This bug probably allows remote code execution
  9066. attacks. Reported by "debuger". Fixes CVE-2011-0427. Bugfix on
  9067. 0.1.2.10-rc.
  9068. - Prevent a denial-of-service attack by disallowing any
  9069. zlib-compressed data whose compression factor is implausibly
  9070. high. Fixes part of bug 2324; reported by "doorss".
  9071. - Zero out a few more keys in memory before freeing them. Fixes
  9072. bug 2384 and part of bug 2385. These key instances found by
  9073. "cypherpunks", based on Andrew Case's report about being able
  9074. to find sensitive data in Tor's memory space if you have enough
  9075. permissions. Bugfix on 0.0.2pre9.
  9076. o Major bugfixes (crashes):
  9077. - Prevent calls to Libevent from inside Libevent log handlers.
  9078. This had potential to cause a nasty set of crashes, especially
  9079. if running Libevent with debug logging enabled, and running
  9080. Tor with a controller watching for low-severity log messages.
  9081. Bugfix on 0.1.0.2-rc. Fixes bug 2190.
  9082. - Add a check for SIZE_T_MAX to tor_realloc() to try to avoid
  9083. underflow errors there too. Fixes the other part of bug 2324.
  9084. - Fix a bug where we would assert if we ever had a
  9085. cached-descriptors.new file (or another file read directly into
  9086. memory) of exactly SIZE_T_CEILING bytes. Fixes bug 2326; bugfix
  9087. on 0.2.1.25. Found by doorss.
  9088. - Fix some potential asserts and parsing issues with grossly
  9089. malformed router caches. Fixes bug 2352; bugfix on Tor 0.2.1.27.
  9090. Found by doorss.
  9091. o Minor bugfixes (other):
  9092. - Fix a bug with handling misformed replies to reverse DNS lookup
  9093. requests in DNSPort. Bugfix on Tor 0.2.0.1-alpha. Related to a
  9094. bug reported by doorss.
  9095. - Fix compilation on mingw when a pthreads compatibility library
  9096. has been installed. (We don't want to use it, so we shouldn't
  9097. be including pthread.h.) Fixes bug 2313; bugfix on 0.1.0.1-rc.
  9098. - Fix a bug where we would declare that we had run out of virtual
  9099. addresses when the address space was only half-exhausted. Bugfix
  9100. on 0.1.2.1-alpha.
  9101. - Correctly handle the case where AutomapHostsOnResolve is set but
  9102. no virtual addresses are available. Fixes bug 2328; bugfix on
  9103. 0.1.2.1-alpha. Bug found by doorss.
  9104. - Correctly handle wrapping around when we run out of virtual
  9105. address space. Found by cypherpunks; bugfix on 0.2.0.5-alpha.
  9106. o Minor features:
  9107. - Update to the January 1 2011 Maxmind GeoLite Country database.
  9108. - Introduce output size checks on all of our decryption functions.
  9109. o Build changes:
  9110. - Tor does not build packages correctly with Automake 1.6 and earlier;
  9111. added a check to Makefile.am to make sure that we're building with
  9112. Automake 1.7 or later.
  9113. - The 0.2.1.28 tarball was missing src/common/OpenBSD_malloc_Linux.c
  9114. because we built it with a too-old version of automake. Thus that
  9115. release broke ./configure --enable-openbsd-malloc, which is popular
  9116. among really fast exit relays on Linux.
  9117. Changes in version 0.2.1.28 - 2010-12-17
  9118. Tor 0.2.1.28 does some code cleanup to reduce the risk of remotely
  9119. exploitable bugs. We also took this opportunity to change the IP address
  9120. for one of our directory authorities, and to update the geoip database
  9121. we ship.
  9122. o Major bugfixes:
  9123. - Fix a remotely exploitable bug that could be used to crash instances
  9124. of Tor remotely by overflowing on the heap. Remote-code execution
  9125. hasn't been confirmed, but can't be ruled out. Everyone should
  9126. upgrade. Bugfix on the 0.1.1 series and later.
  9127. o Directory authority changes:
  9128. - Change IP address and ports for gabelmoo (v3 directory authority).
  9129. o Minor features:
  9130. - Update to the December 1 2010 Maxmind GeoLite Country database.
  9131. Changes in version 0.2.1.27 - 2010-11-23
  9132. Yet another OpenSSL security patch broke its compatibility with Tor:
  9133. Tor 0.2.1.27 makes relays work with openssl 0.9.8p and 1.0.0.b. We
  9134. also took this opportunity to fix several crash bugs, integrate a new
  9135. directory authority, and update the bundled GeoIP database.
  9136. o Major bugfixes:
  9137. - Resolve an incompatibility with OpenSSL 0.9.8p and OpenSSL 1.0.0b:
  9138. No longer set the tlsext_host_name extension on server SSL objects;
  9139. but continue to set it on client SSL objects. Our goal in setting
  9140. it was to imitate a browser, not a vhosting server. Fixes bug 2204;
  9141. bugfix on 0.2.1.1-alpha.
  9142. - Do not log messages to the controller while shrinking buffer
  9143. freelists. Doing so would sometimes make the controller connection
  9144. try to allocate a buffer chunk, which would mess up the internals
  9145. of the freelist and cause an assertion failure. Fixes bug 1125;
  9146. fixed by Robert Ransom. Bugfix on 0.2.0.16-alpha.
  9147. - Learn our external IP address when we're a relay or bridge, even if
  9148. we set PublishServerDescriptor to 0. Bugfix on 0.2.0.3-alpha,
  9149. where we introduced bridge relays that don't need to publish to
  9150. be useful. Fixes bug 2050.
  9151. - Do even more to reject (and not just ignore) annotations on
  9152. router descriptors received anywhere but from the cache. Previously
  9153. we would ignore such annotations at first, but cache them to disk
  9154. anyway. Bugfix on 0.2.0.8-alpha. Found by piebeer.
  9155. - When you're using bridges and your network goes away and your
  9156. bridges get marked as down, recover when you attempt a new socks
  9157. connection (if the network is back), rather than waiting up to an
  9158. hour to try fetching new descriptors for your bridges. Bugfix on
  9159. 0.2.0.3-alpha; fixes bug 1981.
  9160. o Major features:
  9161. - Move to the November 2010 Maxmind GeoLite country db (rather
  9162. than the June 2009 ip-to-country GeoIP db) for our statistics that
  9163. count how many users relays are seeing from each country. Now we'll
  9164. have more accurate data, especially for many African countries.
  9165. o New directory authorities:
  9166. - Set up maatuska (run by Linus Nordberg) as the eighth v3 directory
  9167. authority.
  9168. o Minor bugfixes:
  9169. - Fix an assertion failure that could occur in directory caches or
  9170. bridge users when using a very short voting interval on a testing
  9171. network. Diagnosed by Robert Hogan. Fixes bug 1141; bugfix on
  9172. 0.2.0.8-alpha.
  9173. - Enforce multiplicity rules when parsing annotations. Bugfix on
  9174. 0.2.0.8-alpha. Found by piebeer.
  9175. - Allow handshaking OR connections to take a full KeepalivePeriod
  9176. seconds to handshake. Previously, we would close them after
  9177. IDLE_OR_CONN_TIMEOUT (180) seconds, the same timeout as if they
  9178. were open. Bugfix on 0.2.1.26; fixes bug 1840. Thanks to mingw-san
  9179. for analysis help.
  9180. - When building with --enable-gcc-warnings on OpenBSD, disable
  9181. warnings in system headers. This makes --enable-gcc-warnings
  9182. pass on OpenBSD 4.8.
  9183. o Minor features:
  9184. - Exit nodes didn't recognize EHOSTUNREACH as a plausible error code,
  9185. and so sent back END_STREAM_REASON_MISC. Clients now recognize a new
  9186. stream ending reason for this case: END_STREAM_REASON_NOROUTE.
  9187. Servers can start sending this code when enough clients recognize
  9188. it. Bugfix on 0.1.0.1-rc; fixes part of bug 1793.
  9189. - Build correctly on mingw with more recent versions of OpenSSL 0.9.8.
  9190. Patch from mingw-san.
  9191. o Removed files:
  9192. - Remove the old debian/ directory from the main Tor distribution.
  9193. The official Tor-for-debian git repository lives at the URL
  9194. https://git.torproject.org/debian/tor.git
  9195. - Stop shipping the old doc/website/ directory in the tarball. We
  9196. changed the website format in late 2010, and what we shipped in
  9197. 0.2.1.26 really wasn't that useful anyway.
  9198. Changes in version 0.2.1.26 - 2010-05-02
  9199. Tor 0.2.1.26 addresses the recent connection and memory overload
  9200. problems we've been seeing on relays, especially relays with their
  9201. DirPort open. If your relay has been crashing, or you turned it off
  9202. because it used too many resources, give this release a try.
  9203. This release also fixes yet another instance of broken OpenSSL libraries
  9204. that was causing some relays to drop out of the consensus.
  9205. o Major bugfixes:
  9206. - Teach relays to defend themselves from connection overload. Relays
  9207. now close idle circuits early if it looks like they were intended
  9208. for directory fetches. Relays are also more aggressive about closing
  9209. TLS connections that have no circuits on them. Such circuits are
  9210. unlikely to be re-used, and tens of thousands of them were piling
  9211. up at the fast relays, causing the relays to run out of sockets
  9212. and memory. Bugfix on 0.2.0.22-rc (where clients started tunneling
  9213. their directory fetches over TLS).
  9214. - Fix SSL renegotiation behavior on OpenSSL versions like on Centos
  9215. that claim to be earlier than 0.9.8m, but which have in reality
  9216. backported huge swaths of 0.9.8m or 0.9.8n renegotiation
  9217. behavior. Possible fix for some cases of bug 1346.
  9218. - Directory mirrors were fetching relay descriptors only from v2
  9219. directory authorities, rather than v3 authorities like they should.
  9220. Only 2 v2 authorities remain (compared to 7 v3 authorities), leading
  9221. to a serious bottleneck. Bugfix on 0.2.0.9-alpha. Fixes bug 1324.
  9222. o Minor bugfixes:
  9223. - Finally get rid of the deprecated and now harmful notion of "clique
  9224. mode", where directory authorities maintain TLS connections to
  9225. every other relay.
  9226. o Testsuite fixes:
  9227. - In the util/threads test, no longer free the test_mutex before all
  9228. worker threads have finished. Bugfix on 0.2.1.6-alpha.
  9229. - The master thread could starve the worker threads quite badly on
  9230. certain systems, causing them to run only partially in the allowed
  9231. window. This resulted in test failures. Now the master thread sleeps
  9232. occasionally for a few microseconds while the two worker-threads
  9233. compete for the mutex. Bugfix on 0.2.0.1-alpha.
  9234. Changes in version 0.2.1.25 - 2010-03-16
  9235. Tor 0.2.1.25 fixes a regression introduced in 0.2.1.23 that could
  9236. prevent relays from guessing their IP address correctly. It also fixes
  9237. several minor potential security bugs.
  9238. o Major bugfixes:
  9239. - Fix a regression from our patch for bug 1244 that caused relays
  9240. to guess their IP address incorrectly if they didn't set Address
  9241. in their torrc and/or their address fails to resolve. Bugfix on
  9242. 0.2.1.23; fixes bug 1269.
  9243. - When freeing a session key, zero it out completely. We only zeroed
  9244. the first ptrsize bytes. Bugfix on 0.0.2pre8. Discovered and
  9245. patched by ekir. Fixes bug 1254.
  9246. o Minor bugfixes:
  9247. - Fix a dereference-then-NULL-check sequence when publishing
  9248. descriptors. Bugfix on 0.2.1.5-alpha. Discovered by ekir; fixes
  9249. bug 1255.
  9250. - Fix another dereference-then-NULL-check sequence. Bugfix on
  9251. 0.2.1.14-rc. Discovered by ekir; fixes bug 1256.
  9252. - Make sure we treat potentially not NUL-terminated strings correctly.
  9253. Bugfix on 0.1.1.13-alpha. Discovered by rieo; fixes bug 1257.
  9254. Changes in version 0.2.1.24 - 2010-02-21
  9255. Tor 0.2.1.24 makes Tor work again on the latest OS X -- this time
  9256. for sure!
  9257. o Minor bugfixes:
  9258. - Work correctly out-of-the-box with even more vendor-patched versions
  9259. of OpenSSL. In particular, make it so Debian and OS X don't need
  9260. customized patches to run/build.
  9261. Changes in version 0.2.1.23 - 2010-02-13
  9262. Tor 0.2.1.23 fixes a huge client-side performance bug, makes Tor work
  9263. again on the latest OS X, and updates the location of a directory
  9264. authority.
  9265. o Major bugfixes (performance):
  9266. - We were selecting our guards uniformly at random, and then weighting
  9267. which of our guards we'd use uniformly at random. This imbalance
  9268. meant that Tor clients were severely limited on throughput (and
  9269. probably latency too) by the first hop in their circuit. Now we
  9270. select guards weighted by currently advertised bandwidth. We also
  9271. automatically discard guards picked using the old algorithm. Fixes
  9272. bug 1217; bugfix on 0.2.1.3-alpha. Found by Mike Perry.
  9273. o Major bugfixes:
  9274. - Make Tor work again on the latest OS X: when deciding whether to
  9275. use strange flags to turn TLS renegotiation on, detect the OpenSSL
  9276. version at run-time, not compile time. We need to do this because
  9277. Apple doesn't update its dev-tools headers when it updates its
  9278. libraries in a security patch.
  9279. - Fix a potential buffer overflow in lookup_last_hid_serv_request()
  9280. that could happen on 32-bit platforms with 64-bit time_t. Also fix
  9281. a memory leak when requesting a hidden service descriptor we've
  9282. requested before. Fixes bug 1242, bugfix on 0.2.0.18-alpha. Found
  9283. by aakova.
  9284. o Minor bugfixes:
  9285. - Refactor resolve_my_address() to not use gethostbyname() anymore.
  9286. Fixes bug 1244; bugfix on 0.0.2pre25. Reported by Mike Mestnik.
  9287. o Minor features:
  9288. - Avoid a mad rush at the beginning of each month when each client
  9289. rotates half of its guards. Instead we spread the rotation out
  9290. throughout the month, but we still avoid leaving a precise timestamp
  9291. in the state file about when we first picked the guard. Improves
  9292. over the behavior introduced in 0.1.2.17.
  9293. Changes in version 0.2.1.22 - 2010-01-19
  9294. Tor 0.2.1.22 fixes a critical privacy problem in bridge directory
  9295. authorities -- it would tell you its whole history of bridge descriptors
  9296. if you make the right directory request. This stable update also
  9297. rotates two of the seven v3 directory authority keys and locations.
  9298. o Directory authority changes:
  9299. - Rotate keys (both v3 identity and relay identity) for moria1
  9300. and gabelmoo.
  9301. o Major bugfixes:
  9302. - Stop bridge directory authorities from answering dbg-stability.txt
  9303. directory queries, which would let people fetch a list of all
  9304. bridge identities they track. Bugfix on 0.2.1.6-alpha.
  9305. Changes in version 0.2.1.21 - 2009-12-21
  9306. Tor 0.2.1.21 fixes an incompatibility with the most recent OpenSSL
  9307. library. If you use Tor on Linux / Unix and you're getting SSL
  9308. renegotiation errors, upgrading should help. We also recommend an
  9309. upgrade if you're an exit relay.
  9310. o Major bugfixes:
  9311. - Work around a security feature in OpenSSL 0.9.8l that prevents our
  9312. handshake from working unless we explicitly tell OpenSSL that we
  9313. are using SSL renegotiation safely. We are, of course, but OpenSSL
  9314. 0.9.8l won't work unless we say we are.
  9315. - Avoid crashing if the client is trying to upload many bytes and the
  9316. circuit gets torn down at the same time, or if the flip side
  9317. happens on the exit relay. Bugfix on 0.2.0.1-alpha; fixes bug 1150.
  9318. o Minor bugfixes:
  9319. - Do not refuse to learn about authority certs and v2 networkstatus
  9320. documents that are older than the latest consensus. This bug might
  9321. have degraded client bootstrapping. Bugfix on 0.2.0.10-alpha.
  9322. Spotted and fixed by xmux.
  9323. - Fix a couple of very-hard-to-trigger memory leaks, and one hard-to-
  9324. trigger platform-specific option misparsing case found by Coverity
  9325. Scan.
  9326. - Fix a compilation warning on Fedora 12 by removing an impossible-to-
  9327. trigger assert. Fixes bug 1173.
  9328. Changes in version 0.2.1.20 - 2009-10-15
  9329. Tor 0.2.1.20 fixes a crash bug when you're accessing many hidden
  9330. services at once, prepares for more performance improvements, and
  9331. fixes a bunch of smaller bugs.
  9332. The Windows and OS X bundles also include a more recent Vidalia,
  9333. and switch from Privoxy to Polipo.
  9334. The OS X installers are now drag and drop. It's best to un-install
  9335. Tor/Vidalia and then install this new bundle, rather than upgrade. If
  9336. you want to upgrade, you'll need to update the paths for Tor and Polipo
  9337. in the Vidalia Settings window.
  9338. o Major bugfixes:
  9339. - Send circuit or stream sendme cells when our window has decreased
  9340. by 100 cells, not when it has decreased by 101 cells. Bug uncovered
  9341. by Karsten when testing the "reduce circuit window" performance
  9342. patch. Bugfix on the 54th commit on Tor -- from July 2002,
  9343. before the release of Tor 0.0.0. This is the new winner of the
  9344. oldest-bug prize.
  9345. - Fix a remotely triggerable memory leak when a consensus document
  9346. contains more than one signature from the same voter. Bugfix on
  9347. 0.2.0.3-alpha.
  9348. - Avoid segfault in rare cases when finishing an introduction circuit
  9349. as a client and finding out that we don't have an introduction key
  9350. for it. Fixes bug 1073. Reported by Aaron Swartz.
  9351. o Major features:
  9352. - Tor now reads the "circwindow" parameter out of the consensus,
  9353. and uses that value for its circuit package window rather than the
  9354. default of 1000 cells. Begins the implementation of proposal 168.
  9355. o New directory authorities:
  9356. - Set up urras (run by Jacob Appelbaum) as the seventh v3 directory
  9357. authority.
  9358. - Move moria1 and tonga to alternate IP addresses.
  9359. o Minor bugfixes:
  9360. - Fix a signed/unsigned compile warning in 0.2.1.19.
  9361. - Fix possible segmentation fault on directory authorities. Bugfix on
  9362. 0.2.1.14-rc.
  9363. - Fix an extremely rare infinite recursion bug that could occur if
  9364. we tried to log a message after shutting down the log subsystem.
  9365. Found by Matt Edman. Bugfix on 0.2.0.16-alpha.
  9366. - Fix an obscure bug where hidden services on 64-bit big-endian
  9367. systems might mis-read the timestamp in v3 introduce cells, and
  9368. refuse to connect back to the client. Discovered by "rotor".
  9369. Bugfix on 0.2.1.6-alpha.
  9370. - We were triggering a CLOCK_SKEW controller status event whenever
  9371. we connect via the v2 connection protocol to any relay that has
  9372. a wrong clock. Instead, we should only inform the controller when
  9373. it's a trusted authority that claims our clock is wrong. Bugfix
  9374. on 0.2.0.20-rc; starts to fix bug 1074. Reported by SwissTorExit.
  9375. - We were telling the controller about CHECKING_REACHABILITY and
  9376. REACHABILITY_FAILED status events whenever we launch a testing
  9377. circuit or notice that one has failed. Instead, only tell the
  9378. controller when we want to inform the user of overall success or
  9379. overall failure. Bugfix on 0.1.2.6-alpha. Fixes bug 1075. Reported
  9380. by SwissTorExit.
  9381. - Don't warn when we're using a circuit that ends with a node
  9382. excluded in ExcludeExitNodes, but the circuit is not used to access
  9383. the outside world. This should help fix bug 1090. Bugfix on
  9384. 0.2.1.6-alpha.
  9385. - Work around a small memory leak in some versions of OpenSSL that
  9386. stopped the memory used by the hostname TLS extension from being
  9387. freed.
  9388. o Minor features:
  9389. - Add a "getinfo status/accepted-server-descriptor" controller
  9390. command, which is the recommended way for controllers to learn
  9391. whether our server descriptor has been successfully received by at
  9392. least on directory authority. Un-recommend good-server-descriptor
  9393. getinfo and status events until we have a better design for them.
  9394. Changes in version 0.2.1.19 - 2009-07-28
  9395. Tor 0.2.1.19 fixes a major bug with accessing and providing hidden
  9396. services.
  9397. o Major bugfixes:
  9398. - Make accessing hidden services on 0.2.1.x work right again.
  9399. Bugfix on 0.2.1.3-alpha; workaround for bug 1038. Diagnosis and
  9400. part of patch provided by "optimist".
  9401. o Minor features:
  9402. - When a relay/bridge is writing out its identity key fingerprint to
  9403. the "fingerprint" file and to its logs, write it without spaces. Now
  9404. it will look like the fingerprints in our bridges documentation,
  9405. and confuse fewer users.
  9406. o Minor bugfixes:
  9407. - Relays no longer publish a new server descriptor if they change
  9408. their MaxAdvertisedBandwidth config option but it doesn't end up
  9409. changing their advertised bandwidth numbers. Bugfix on 0.2.0.28-rc;
  9410. fixes bug 1026. Patch from Sebastian.
  9411. - Avoid leaking memory every time we get a create cell but we have
  9412. so many already queued that we refuse it. Bugfix on 0.2.0.19-alpha;
  9413. fixes bug 1034. Reported by BarkerJr.
  9414. Changes in version 0.2.1.18 - 2009-07-24
  9415. Tor 0.2.1.18 lays the foundations for performance improvements,
  9416. adds status events to help users diagnose bootstrap problems, adds
  9417. optional authentication/authorization for hidden services, fixes a
  9418. variety of potential anonymity problems, and includes a huge pile of
  9419. other features and bug fixes.
  9420. o Major features (clients):
  9421. - Start sending "bootstrap phase" status events to the controller,
  9422. so it can keep the user informed of progress fetching directory
  9423. information and establishing circuits. Also inform the controller
  9424. if we think we're stuck at a particular bootstrap phase. Implements
  9425. proposal 137.
  9426. - Clients replace entry guards that were chosen more than a few months
  9427. ago. This change should significantly improve client performance,
  9428. especially once more people upgrade, since relays that have been
  9429. a guard for a long time are currently overloaded.
  9430. - Network status consensus documents and votes now contain bandwidth
  9431. information for each relay. Clients use the bandwidth values
  9432. in the consensus, rather than the bandwidth values in each
  9433. relay descriptor. This approach opens the door to more accurate
  9434. bandwidth estimates once the directory authorities start doing
  9435. active measurements. Implements part of proposal 141.
  9436. o Major features (relays):
  9437. - Disable and refactor some debugging checks that forced a linear scan
  9438. over the whole server-side DNS cache. These accounted for over 50%
  9439. of CPU time on a relatively busy exit node's gprof profile. Also,
  9440. disable some debugging checks that appeared in exit node profile
  9441. data. Found by Jacob.
  9442. - New DirPortFrontPage option that takes an html file and publishes
  9443. it as "/" on the DirPort. Now relay operators can provide a
  9444. disclaimer without needing to set up a separate webserver. There's
  9445. a sample disclaimer in contrib/tor-exit-notice.html.
  9446. o Major features (hidden services):
  9447. - Make it possible to build hidden services that only certain clients
  9448. are allowed to connect to. This is enforced at several points,
  9449. so that unauthorized clients are unable to send INTRODUCE cells
  9450. to the service, or even (depending on the type of authentication)
  9451. to learn introduction points. This feature raises the bar for
  9452. certain kinds of active attacks against hidden services. Design
  9453. and code by Karsten Loesing. Implements proposal 121.
  9454. - Relays now store and serve v2 hidden service descriptors by default,
  9455. i.e., the new default value for HidServDirectoryV2 is 1. This is
  9456. the last step in proposal 114, which aims to make hidden service
  9457. lookups more reliable.
  9458. o Major features (path selection):
  9459. - ExitNodes and Exclude*Nodes config options now allow you to restrict
  9460. by country code ("{US}") or IP address or address pattern
  9461. ("255.128.0.0/16"). Patch from Robert Hogan. It still needs some
  9462. refinement to decide what config options should take priority if
  9463. you ask to both use a particular node and exclude it.
  9464. o Major features (misc):
  9465. - When building a consensus, do not include routers that are down.
  9466. This cuts down 30% to 40% on consensus size. Implements proposal
  9467. 138.
  9468. - New TestingTorNetwork config option to allow adjustment of
  9469. previously constant values that could slow bootstrapping. Implements
  9470. proposal 135. Patch from Karsten.
  9471. - Convert many internal address representations to optionally hold
  9472. IPv6 addresses. Generate and accept IPv6 addresses in many protocol
  9473. elements. Make resolver code handle nameservers located at IPv6
  9474. addresses.
  9475. - More work on making our TLS handshake blend in: modify the list
  9476. of ciphers advertised by OpenSSL in client mode to even more
  9477. closely resemble a common web browser. We cheat a little so that
  9478. we can advertise ciphers that the locally installed OpenSSL doesn't
  9479. know about.
  9480. - Use the TLS1 hostname extension to more closely resemble browser
  9481. behavior.
  9482. o Security fixes (anonymity/entropy):
  9483. - Never use a connection with a mismatched address to extend a
  9484. circuit, unless that connection is canonical. A canonical
  9485. connection is one whose address is authenticated by the router's
  9486. identity key, either in a NETINFO cell or in a router descriptor.
  9487. - Implement most of proposal 110: The first K cells to be sent
  9488. along a circuit are marked as special "early" cells; only K "early"
  9489. cells will be allowed. Once this code is universal, we can block
  9490. certain kinds of denial-of-service attack by requiring that EXTEND
  9491. commands must be sent using an "early" cell.
  9492. - Resume using OpenSSL's RAND_poll() for better (and more portable)
  9493. cross-platform entropy collection again. We used to use it, then
  9494. stopped using it because of a bug that could crash systems that
  9495. called RAND_poll when they had a lot of fds open. It looks like the
  9496. bug got fixed in late 2006. Our new behavior is to call RAND_poll()
  9497. at startup, and to call RAND_poll() when we reseed later only if
  9498. we have a non-buggy OpenSSL version.
  9499. - When the client is choosing entry guards, now it selects at most
  9500. one guard from a given relay family. Otherwise we could end up with
  9501. all of our entry points into the network run by the same operator.
  9502. Suggested by Camilo Viecco. Fix on 0.1.1.11-alpha.
  9503. - Do not use or believe expired v3 authority certificates. Patch
  9504. from Karsten. Bugfix in 0.2.0.x. Fixes bug 851.
  9505. - Drop begin cells to a hidden service if they come from the middle
  9506. of a circuit. Patch from lark.
  9507. - When we erroneously receive two EXTEND cells for the same circuit
  9508. ID on the same connection, drop the second. Patch from lark.
  9509. - Authorities now vote for the Stable flag for any router whose
  9510. weighted MTBF is at least 5 days, regardless of the mean MTBF.
  9511. - Clients now never report any stream end reason except 'MISC'.
  9512. Implements proposal 148.
  9513. o Major bugfixes (crashes):
  9514. - Parse dates and IPv4 addresses in a locale- and libc-independent
  9515. manner, to avoid platform-dependent behavior on malformed input.
  9516. - Fix a crash that occurs on exit nodes when a nameserver request
  9517. timed out. Bugfix on 0.1.2.1-alpha; our CLEAR debugging code had
  9518. been suppressing the bug since 0.1.2.10-alpha. Partial fix for
  9519. bug 929.
  9520. - Do not assume that a stack-allocated character array will be
  9521. 64-bit aligned on platforms that demand that uint64_t access is
  9522. aligned. Possible fix for bug 604.
  9523. - Resolve a very rare crash bug that could occur when the user forced
  9524. a nameserver reconfiguration during the middle of a nameserver
  9525. probe. Fixes bug 526. Bugfix on 0.1.2.1-alpha.
  9526. - Avoid a "0 divided by 0" calculation when calculating router uptime
  9527. at directory authorities. Bugfix on 0.2.0.8-alpha.
  9528. - Fix an assertion bug in parsing policy-related options; possible fix
  9529. for bug 811.
  9530. - Rate-limit too-many-sockets messages: when they happen, they happen
  9531. a lot and end up filling up the disk. Resolves bug 748.
  9532. - Fix a race condition that could cause crashes or memory corruption
  9533. when running as a server with a controller listening for log
  9534. messages.
  9535. - Avoid crashing when we have a policy specified in a DirPolicy or
  9536. SocksPolicy or ReachableAddresses option with ports set on it,
  9537. and we re-load the policy. May fix bug 996.
  9538. - Fix an assertion failure on 64-bit platforms when we allocated
  9539. memory right up to the end of a memarea, then realigned the memory
  9540. one step beyond the end. Fixes a possible cause of bug 930.
  9541. - Protect the count of open sockets with a mutex, so we can't
  9542. corrupt it when two threads are closing or opening sockets at once.
  9543. Fix for bug 939. Bugfix on 0.2.0.1-alpha.
  9544. o Major bugfixes (clients):
  9545. - Discard router descriptors as we load them if they are more than
  9546. five days old. Otherwise if Tor is off for a long time and then
  9547. starts with cached descriptors, it will try to use the onion keys
  9548. in those obsolete descriptors when building circuits. Fixes bug 887.
  9549. - When we choose to abandon a new entry guard because we think our
  9550. older ones might be better, close any circuits pending on that
  9551. new entry guard connection. This fix should make us recover much
  9552. faster when our network is down and then comes back. Bugfix on
  9553. 0.1.2.8-beta; found by lodger.
  9554. - When Tor clients restart after 1-5 days, they discard all their
  9555. cached descriptors as too old, but they still use the cached
  9556. consensus document. This approach is good for robustness, but
  9557. bad for performance: since they don't know any bandwidths, they
  9558. end up choosing at random rather than weighting their choice by
  9559. speed. Fixed by the above feature of putting bandwidths in the
  9560. consensus.
  9561. o Major bugfixes (relays):
  9562. - Relays were falling out of the networkstatus consensus for
  9563. part of a day if they changed their local config but the
  9564. authorities discarded their new descriptor as "not sufficiently
  9565. different". Now directory authorities accept a descriptor as changed
  9566. if BandwidthRate or BandwidthBurst changed. Partial fix for bug 962;
  9567. patch by Sebastian.
  9568. - Ensure that two circuits can never exist on the same connection
  9569. with the same circuit ID, even if one is marked for close. This
  9570. is conceivably a bugfix for bug 779; fixes a bug on 0.1.0.4-rc.
  9571. - Directory authorities were neglecting to mark relays down in their
  9572. internal histories if the relays fall off the routerlist without
  9573. ever being found unreachable. So there were relays in the histories
  9574. that haven't been seen for eight months, and are listed as being
  9575. up for eight months. This wreaked havoc on the "median wfu" and
  9576. "median mtbf" calculations, in turn making Guard and Stable flags
  9577. wrong, hurting network performance. Fixes bugs 696 and 969. Bugfix
  9578. on 0.2.0.6-alpha.
  9579. o Major bugfixes (hidden services):
  9580. - When establishing a hidden service, introduction points that
  9581. originate from cannibalized circuits were completely ignored
  9582. and not included in rendezvous service descriptors. This might
  9583. have been another reason for delay in making a hidden service
  9584. available. Bugfix from long ago (0.0.9.x?)
  9585. o Major bugfixes (memory and resource management):
  9586. - Fixed some memory leaks -- some quite frequent, some almost
  9587. impossible to trigger -- based on results from Coverity.
  9588. - Speed up parsing and cut down on memory fragmentation by using
  9589. stack-style allocations for parsing directory objects. Previously,
  9590. this accounted for over 40% of allocations from within Tor's code
  9591. on a typical directory cache.
  9592. - Use a Bloom filter rather than a digest-based set to track which
  9593. descriptors we need to keep around when we're cleaning out old
  9594. router descriptors. This speeds up the computation significantly,
  9595. and may reduce fragmentation.
  9596. o New/changed config options:
  9597. - Now NodeFamily and MyFamily config options allow spaces in
  9598. identity fingerprints, so it's easier to paste them in.
  9599. Suggested by Lucky Green.
  9600. - Allow ports 465 and 587 in the default exit policy again. We had
  9601. rejected them in 0.1.0.15, because back in 2005 they were commonly
  9602. misconfigured and ended up as spam targets. We hear they are better
  9603. locked down these days.
  9604. - Make TrackHostExit mappings expire a while after their last use, not
  9605. after their creation. Patch from Robert Hogan.
  9606. - Add an ExcludeExitNodes option so users can list a set of nodes
  9607. that should be be excluded from the exit node position, but
  9608. allowed elsewhere. Implements proposal 151.
  9609. - New --hush command-line option similar to --quiet. While --quiet
  9610. disables all logging to the console on startup, --hush limits the
  9611. output to messages of warning and error severity.
  9612. - New configure/torrc options (--enable-geoip-stats,
  9613. DirRecordUsageByCountry) to record how many IPs we've served
  9614. directory info to in each country code, how many status documents
  9615. total we've sent to each country code, and what share of the total
  9616. directory requests we should expect to see.
  9617. - Make outbound DNS packets respect the OutboundBindAddress setting.
  9618. Fixes the bug part of bug 798. Bugfix on 0.1.2.2-alpha.
  9619. - Allow separate log levels to be configured for different logging
  9620. domains. For example, this allows one to log all notices, warnings,
  9621. or errors, plus all memory management messages of level debug or
  9622. higher, with: Log [MM] debug-err [*] notice-err file /var/log/tor.
  9623. - Update to the "June 3 2009" ip-to-country file.
  9624. o Minor features (relays):
  9625. - Raise the minimum rate limiting to be a relay from 20000 bytes
  9626. to 20480 bytes (aka 20KB/s), to match our documentation. Also
  9627. update directory authorities so they always assign the Fast flag
  9628. to relays with 20KB/s of capacity. Now people running relays won't
  9629. suddenly find themselves not seeing any use, if the network gets
  9630. faster on average.
  9631. - If we're a relay and we change our IP address, be more verbose
  9632. about the reason that made us change. Should help track down
  9633. further bugs for relays on dynamic IP addresses.
  9634. - Exit servers can now answer resolve requests for ip6.arpa addresses.
  9635. - Implement most of Proposal 152: allow specialized servers to permit
  9636. single-hop circuits, and clients to use those servers to build
  9637. single-hop circuits when using a specialized controller. Patch
  9638. from Josh Albrecht. Resolves feature request 768.
  9639. - When relays do their initial bandwidth measurement, don't limit
  9640. to just our entry guards for the test circuits. Otherwise we tend
  9641. to have multiple test circuits going through a single entry guard,
  9642. which makes our bandwidth test less accurate. Fixes part of bug 654;
  9643. patch contributed by Josh Albrecht.
  9644. o Minor features (directory authorities):
  9645. - Try not to open more than one descriptor-downloading connection
  9646. to an authority at once. This should reduce load on directory
  9647. authorities. Fixes bug 366.
  9648. - Add cross-certification to newly generated certificates, so that
  9649. a signing key is enough information to look up a certificate. Start
  9650. serving certificates by <identity digest, signing key digest>
  9651. pairs. Implements proposal 157.
  9652. - When a directory authority downloads a descriptor that it then
  9653. immediately rejects, do not retry downloading it right away. Should
  9654. save some bandwidth on authorities. Fix for bug 888. Patch by
  9655. Sebastian Hahn.
  9656. - Directory authorities now serve a /tor/dbg-stability.txt URL to
  9657. help debug WFU and MTBF calculations.
  9658. - In directory authorities' approved-routers files, allow
  9659. fingerprints with or without space.
  9660. o Minor features (directory mirrors):
  9661. - When a download gets us zero good descriptors, do not notify
  9662. Tor that new directory information has arrived.
  9663. - Servers support a new URL scheme for consensus downloads that
  9664. allows the client to specify which authorities are trusted.
  9665. The server then only sends the consensus if the client will trust
  9666. it. Otherwise a 404 error is sent back. Clients use this
  9667. new scheme when the server supports it (meaning it's running
  9668. 0.2.1.1-alpha or later). Implements proposal 134.
  9669. o Minor features (bridges):
  9670. - If the bridge config line doesn't specify a port, assume 443.
  9671. This makes bridge lines a bit smaller and easier for users to
  9672. understand.
  9673. - If we're using bridges and our network goes away, be more willing
  9674. to forgive our bridges and try again when we get an application
  9675. request.
  9676. o Minor features (hidden services):
  9677. - When the client launches an introduction circuit, retry with a
  9678. new circuit after 30 seconds rather than 60 seconds.
  9679. - Launch a second client-side introduction circuit in parallel
  9680. after a delay of 15 seconds (based on work by Christian Wilms).
  9681. - Hidden services start out building five intro circuits rather
  9682. than three, and when the first three finish they publish a service
  9683. descriptor using those. Now we publish our service descriptor much
  9684. faster after restart.
  9685. - Drop the requirement to have an open dir port for storing and
  9686. serving v2 hidden service descriptors.
  9687. o Minor features (build and packaging):
  9688. - On Linux, use the prctl call to re-enable core dumps when the User
  9689. option is set.
  9690. - Try to make sure that the version of Libevent we're running with
  9691. is binary-compatible with the one we built with. May address bug
  9692. 897 and others.
  9693. - Add a new --enable-local-appdata configuration switch to change
  9694. the default location of the datadir on win32 from APPDATA to
  9695. LOCAL_APPDATA. In the future, we should migrate to LOCAL_APPDATA
  9696. entirely. Patch from coderman.
  9697. - Build correctly against versions of OpenSSL 0.9.8 or later that
  9698. are built without support for deprecated functions.
  9699. - On platforms with a maximum syslog string length, truncate syslog
  9700. messages to that length ourselves, rather than relying on the
  9701. system to do it for us.
  9702. - Automatically detect MacOSX versions earlier than 10.4.0, and
  9703. disable kqueue from inside Tor when running with these versions.
  9704. We previously did this from the startup script, but that was no
  9705. help to people who didn't use the startup script. Resolves bug 863.
  9706. - Build correctly when configured to build outside the main source
  9707. path. Patch from Michael Gold.
  9708. - Disable GCC's strict alias optimization by default, to avoid the
  9709. likelihood of its introducing subtle bugs whenever our code violates
  9710. the letter of C99's alias rules.
  9711. - Change the contrib/tor.logrotate script so it makes the new
  9712. logs as "_tor:_tor" rather than the default, which is generally
  9713. "root:wheel". Fixes bug 676, reported by Serge Koksharov.
  9714. - Change our header file guard macros to be less likely to conflict
  9715. with system headers. Adam Langley noticed that we were conflicting
  9716. with log.h on Android.
  9717. - Add a couple of extra warnings to --enable-gcc-warnings for GCC 4.3,
  9718. and stop using a warning that had become unfixably verbose under
  9719. GCC 4.3.
  9720. - Use a lockfile to make sure that two Tor processes are not
  9721. simultaneously running with the same datadir.
  9722. - Allow OpenSSL to use dynamic locks if it wants.
  9723. - Add LIBS=-lrt to Makefile.am so the Tor RPMs use a static libevent.
  9724. o Minor features (controllers):
  9725. - When generating circuit events with verbose nicknames for
  9726. controllers, try harder to look up nicknames for routers on a
  9727. circuit. (Previously, we would look in the router descriptors we had
  9728. for nicknames, but not in the consensus.) Partial fix for bug 941.
  9729. - New controller event NEWCONSENSUS that lists the networkstatus
  9730. lines for every recommended relay. Now controllers like Torflow
  9731. can keep up-to-date on which relays they should be using.
  9732. - New controller event "clients_seen" to report a geoip-based summary
  9733. of which countries we've seen clients from recently. Now controllers
  9734. like Vidalia can show bridge operators that they're actually making
  9735. a difference.
  9736. - Add a 'getinfo status/clients-seen' controller command, in case
  9737. controllers want to hear clients_seen events but connect late.
  9738. - New CONSENSUS_ARRIVED event to note when a new consensus has
  9739. been fetched and validated.
  9740. - Add an internal-use-only __ReloadTorrcOnSIGHUP option for
  9741. controllers to prevent SIGHUP from reloading the configuration.
  9742. Fixes bug 856.
  9743. - Return circuit purposes in response to GETINFO circuit-status.
  9744. Fixes bug 858.
  9745. - Serve the latest v3 networkstatus consensus via the control
  9746. port. Use "getinfo dir/status-vote/current/consensus" to fetch it.
  9747. - Add a "GETINFO /status/bootstrap-phase" controller option, so the
  9748. controller can query our current bootstrap state in case it attaches
  9749. partway through and wants to catch up.
  9750. - Provide circuit purposes along with circuit events to the controller.
  9751. o Minor features (tools):
  9752. - Do not have tor-resolve automatically refuse all .onion addresses;
  9753. if AutomapHostsOnResolve is set in your torrc, this will work fine.
  9754. - Add a -p option to tor-resolve for specifying the SOCKS port: some
  9755. people find host:port too confusing.
  9756. - Print the SOCKS5 error message string as well as the error code
  9757. when a tor-resolve request fails. Patch from Jacob.
  9758. o Minor bugfixes (memory and resource management):
  9759. - Clients no longer cache certificates for authorities they do not
  9760. recognize. Bugfix on 0.2.0.9-alpha.
  9761. - Do not use C's stdio library for writing to log files. This will
  9762. improve logging performance by a minute amount, and will stop
  9763. leaking fds when our disk is full. Fixes bug 861.
  9764. - Stop erroneous use of O_APPEND in cases where we did not in fact
  9765. want to re-seek to the end of a file before every last write().
  9766. - Fix a small alignment and memory-wasting bug on buffer chunks.
  9767. Spotted by rovv.
  9768. - Add a malloc_good_size implementation to OpenBSD_malloc_linux.c,
  9769. to avoid unused RAM in buffer chunks and memory pools.
  9770. - Reduce the default smartlist size from 32 to 16; it turns out that
  9771. most smartlists hold around 8-12 elements tops.
  9772. - Make dumpstats() log the fullness and size of openssl-internal
  9773. buffers.
  9774. - If the user has applied the experimental SSL_MODE_RELEASE_BUFFERS
  9775. patch to their OpenSSL, turn it on to save memory on servers. This
  9776. patch will (with any luck) get included in a mainline distribution
  9777. before too long.
  9778. - Fix a memory leak when v3 directory authorities load their keys
  9779. and cert from disk. Bugfix on 0.2.0.1-alpha.
  9780. - Stop using malloc_usable_size() to use more area than we had
  9781. actually allocated: it was safe, but made valgrind really unhappy.
  9782. - Make the assert_circuit_ok() function work correctly on circuits that
  9783. have already been marked for close.
  9784. - Fix uninitialized size field for memory area allocation: may improve
  9785. memory performance during directory parsing.
  9786. o Minor bugfixes (clients):
  9787. - Stop reloading the router list from disk for no reason when we
  9788. run out of reachable directory mirrors. Once upon a time reloading
  9789. it would set the 'is_running' flag back to 1 for them. It hasn't
  9790. done that for a long time.
  9791. - When we had picked an exit node for a connection, but marked it as
  9792. "optional", and it turned out we had no onion key for the exit,
  9793. stop wanting that exit and try again. This situation may not
  9794. be possible now, but will probably become feasible with proposal
  9795. 158. Spotted by rovv. Fixes another case of bug 752.
  9796. - Fix a bug in address parsing that was preventing bridges or hidden
  9797. service targets from being at IPv6 addresses.
  9798. - Do not remove routers as too old if we do not have any consensus
  9799. document. Bugfix on 0.2.0.7-alpha.
  9800. - When an exit relay resolves a stream address to a local IP address,
  9801. do not just keep retrying that same exit relay over and
  9802. over. Instead, just close the stream. Addresses bug 872. Bugfix
  9803. on 0.2.0.32. Patch from rovv.
  9804. - Made Tor a little less aggressive about deleting expired
  9805. certificates. Partial fix for bug 854.
  9806. - Treat duplicate certificate fetches as failures, so that we do
  9807. not try to re-fetch an expired certificate over and over and over.
  9808. - Do not say we're fetching a certificate when we'll in fact skip it
  9809. because of a pending download.
  9810. - If we have correct permissions on $datadir, we complain to stdout
  9811. and fail to start. But dangerous permissions on
  9812. $datadir/cached-status/ would cause us to open a log and complain
  9813. there. Now complain to stdout and fail to start in both cases. Fixes
  9814. bug 820, reported by seeess.
  9815. o Minor bugfixes (bridges):
  9816. - When we made bridge authorities stop serving bridge descriptors over
  9817. unencrypted links, we also broke DirPort reachability testing for
  9818. bridges. So bridges with a non-zero DirPort were printing spurious
  9819. warns to their logs. Bugfix on 0.2.0.16-alpha. Fixes bug 709.
  9820. - Don't allow a bridge to publish its router descriptor to a
  9821. non-bridge directory authority. Fixes part of bug 932.
  9822. - When we change to or from being a bridge, reset our counts of
  9823. client usage by country. Fixes bug 932.
  9824. o Minor bugfixes (relays):
  9825. - Log correct error messages for DNS-related network errors on
  9826. Windows.
  9827. - Actually return -1 in the error case for read_bandwidth_usage().
  9828. Harmless bug, since we currently don't care about the return value
  9829. anywhere. Bugfix on 0.2.0.9-alpha.
  9830. - Provide a more useful log message if bug 977 (related to buffer
  9831. freelists) ever reappears, and do not crash right away.
  9832. - We were already rejecting relay begin cells with destination port
  9833. of 0. Now also reject extend cells with destination port or address
  9834. of 0. Suggested by lark.
  9835. - When we can't transmit a DNS request due to a network error, retry
  9836. it after a while, and eventually transmit a failing response to
  9837. the RESOLVED cell. Bugfix on 0.1.2.5-alpha.
  9838. - Solve a bug that kept hardware crypto acceleration from getting
  9839. enabled when accounting was turned on. Fixes bug 907. Bugfix on
  9840. 0.0.9pre6.
  9841. - When a canonical connection appears later in our internal list
  9842. than a noncanonical one for a given OR ID, always use the
  9843. canonical one. Bugfix on 0.2.0.12-alpha. Fixes bug 805.
  9844. Spotted by rovv.
  9845. - Avoid some nasty corner cases in the logic for marking connections
  9846. as too old or obsolete or noncanonical for circuits. Partial
  9847. bugfix on bug 891.
  9848. - Fix another interesting corner-case of bug 891 spotted by rovv:
  9849. Previously, if two hosts had different amounts of clock drift, and
  9850. one of them created a new connection with just the wrong timing,
  9851. the other might decide to deprecate the new connection erroneously.
  9852. Bugfix on 0.1.1.13-alpha.
  9853. - If one win32 nameserver fails to get added, continue adding the
  9854. rest, and don't automatically fail.
  9855. - Fix a bug where an unreachable relay would establish enough
  9856. reachability testing circuits to do a bandwidth test -- if
  9857. we already have a connection to the middle hop of the testing
  9858. circuit, then it could establish the last hop by using the existing
  9859. connection. Bugfix on 0.1.2.2-alpha, exposed when we made testing
  9860. circuits no longer use entry guards in 0.2.1.3-alpha.
  9861. o Minor bugfixes (directory authorities):
  9862. - Limit uploaded directory documents to be 16M rather than 500K.
  9863. The directory authorities were refusing v3 consensus votes from
  9864. other authorities, since the votes are now 504K. Fixes bug 959;
  9865. bugfix on 0.0.2pre17 (where we raised it from 50K to 500K ;).
  9866. - Directory authorities should never send a 503 "busy" response to
  9867. requests for votes or keys. Bugfix on 0.2.0.8-alpha; exposed by
  9868. bug 959.
  9869. - Fix code so authorities _actually_ send back X-Descriptor-Not-New
  9870. headers. Bugfix on 0.2.0.10-alpha.
  9871. o Minor bugfixes (hidden services):
  9872. - When we can't find an intro key for a v2 hidden service descriptor,
  9873. fall back to the v0 hidden service descriptor and log a bug message.
  9874. Workaround for bug 1024.
  9875. - In very rare situations new hidden service descriptors were
  9876. published earlier than 30 seconds after the last change to the
  9877. service. (We currently think that a hidden service descriptor
  9878. that's been stable for 30 seconds is worth publishing.)
  9879. - If a hidden service sends us an END cell, do not consider
  9880. retrying the connection; just close it. Patch from rovv.
  9881. - If we are not using BEGIN_DIR cells, don't attempt to contact hidden
  9882. service directories if they have no advertised dir port. Bugfix
  9883. on 0.2.0.10-alpha.
  9884. o Minor bugfixes (tools):
  9885. - In the torify(1) manpage, mention that tsocks will leak your
  9886. DNS requests.
  9887. o Minor bugfixes (controllers):
  9888. - If the controller claimed responsibility for a stream, but that
  9889. stream never finished making its connection, it would live
  9890. forever in circuit_wait state. Now we close it after SocksTimeout
  9891. seconds. Bugfix on 0.1.2.7-alpha; reported by Mike Perry.
  9892. - Make DNS resolved controller events into "CLOSED", not
  9893. "FAILED". Bugfix on 0.1.2.5-alpha. Fix by Robert Hogan. Resolves
  9894. bug 807.
  9895. - The control port would close the connection before flushing long
  9896. replies, such as the network consensus, if a QUIT command was issued
  9897. before the reply had completed. Now, the control port flushes all
  9898. pending replies before closing the connection. Also fix a spurious
  9899. warning when a QUIT command is issued after a malformed or rejected
  9900. AUTHENTICATE command, but before the connection was closed. Patch
  9901. by Marcus Griep. Fixes bugs 1015 and 1016.
  9902. - Fix a bug that made stream bandwidth get misreported to the
  9903. controller.
  9904. o Deprecated and removed features:
  9905. - The old "tor --version --version" command, which would print out
  9906. the subversion "Id" of most of the source files, is now removed. It
  9907. turned out to be less useful than we'd expected, and harder to
  9908. maintain.
  9909. - RedirectExits has been removed. It was deprecated since
  9910. 0.2.0.3-alpha.
  9911. - Finally remove deprecated "EXTENDED_FORMAT" controller feature. It
  9912. has been called EXTENDED_EVENTS since 0.1.2.4-alpha.
  9913. - Cell pools are now always enabled; --disable-cell-pools is ignored.
  9914. - Directory mirrors no longer fetch the v1 directory or
  9915. running-routers files. They are obsolete, and nobody asks for them
  9916. anymore. This is the first step to making v1 authorities obsolete.
  9917. - Take out the TestVia config option, since it was a workaround for
  9918. a bug that was fixed in Tor 0.1.1.21.
  9919. - Mark RendNodes, RendExcludeNodes, HiddenServiceNodes, and
  9920. HiddenServiceExcludeNodes as obsolete: they never worked properly,
  9921. and nobody seems to be using them. Fixes bug 754. Bugfix on
  9922. 0.1.0.1-rc. Patch from Christian Wilms.
  9923. - Remove all backward-compatibility code for relays running
  9924. versions of Tor so old that they no longer work at all on the
  9925. Tor network.
  9926. o Code simplifications and refactoring:
  9927. - Tool-assisted documentation cleanup. Nearly every function or
  9928. static variable in Tor should have its own documentation now.
  9929. - Rename the confusing or_is_obsolete field to the more appropriate
  9930. is_bad_for_new_circs, and move it to or_connection_t where it
  9931. belongs.
  9932. - Move edge-only flags from connection_t to edge_connection_t: not
  9933. only is this better coding, but on machines of plausible alignment,
  9934. it should save 4-8 bytes per connection_t. "Every little bit helps."
  9935. - Rename ServerDNSAllowBrokenResolvConf to ServerDNSAllowBrokenConfig
  9936. for consistency; keep old option working for backward compatibility.
  9937. - Simplify the code for finding connections to use for a circuit.
  9938. - Revise the connection_new functions so that a more typesafe variant
  9939. exists. This will work better with Coverity, and let us find any
  9940. actual mistakes we're making here.
  9941. - Refactor unit testing logic so that dmalloc can be used sensibly
  9942. with unit tests to check for memory leaks.
  9943. - Move all hidden-service related fields from connection and circuit
  9944. structure to substructures: this way they won't eat so much memory.
  9945. - Squeeze 2-5% out of client performance (according to oprofile) by
  9946. improving the implementation of some policy-manipulation functions.
  9947. - Change the implementation of ExcludeNodes and ExcludeExitNodes to
  9948. be more efficient. Formerly it was quadratic in the number of
  9949. servers; now it should be linear. Fixes bug 509.
  9950. - Save 16-22 bytes per open circuit by moving the n_addr, n_port,
  9951. and n_conn_id_digest fields into a separate structure that's
  9952. only needed when the circuit has not yet attached to an n_conn.
  9953. - Optimize out calls to time(NULL) that occur for every IO operation,
  9954. or for every cell. On systems like Windows where time() is a
  9955. slow syscall, this fix will be slightly helpful.
  9956. Changes in version 0.2.0.35 - 2009-06-24
  9957. o Security fix:
  9958. - Avoid crashing in the presence of certain malformed descriptors.
  9959. Found by lark, and by automated fuzzing.
  9960. - Fix an edge case where a malicious exit relay could convince a
  9961. controller that the client's DNS question resolves to an internal IP
  9962. address. Bug found and fixed by "optimist"; bugfix on 0.1.2.8-beta.
  9963. o Major bugfixes:
  9964. - Finally fix the bug where dynamic-IP relays disappear when their
  9965. IP address changes: directory mirrors were mistakenly telling
  9966. them their old address if they asked via begin_dir, so they
  9967. never got an accurate answer about their new address, so they
  9968. just vanished after a day. For belt-and-suspenders, relays that
  9969. don't set Address in their config now avoid using begin_dir for
  9970. all direct connections. Should fix bugs 827, 883, and 900.
  9971. - Fix a timing-dependent, allocator-dependent, DNS-related crash bug
  9972. that would occur on some exit nodes when DNS failures and timeouts
  9973. occurred in certain patterns. Fix for bug 957.
  9974. o Minor bugfixes:
  9975. - When starting with a cache over a few days old, do not leak
  9976. memory for the obsolete router descriptors in it. Bugfix on
  9977. 0.2.0.33; fixes bug 672.
  9978. - Hidden service clients didn't use a cached service descriptor that
  9979. was older than 15 minutes, but wouldn't fetch a new one either,
  9980. because there was already one in the cache. Now, fetch a v2
  9981. descriptor unless the same descriptor was added to the cache within
  9982. the last 15 minutes. Fixes bug 997; reported by Marcus Griep.
  9983. Changes in version 0.2.0.34 - 2009-02-08
  9984. Tor 0.2.0.34 features several more security-related fixes. You should
  9985. upgrade, especially if you run an exit relay (remote crash) or a
  9986. directory authority (remote infinite loop), or you're on an older
  9987. (pre-XP) or not-recently-patched Windows (remote exploit).
  9988. This release marks end-of-life for Tor 0.1.2.x. Those Tor versions
  9989. have many known flaws, and nobody should be using them. You should
  9990. upgrade. If you're using a Linux or BSD and its packages are obsolete,
  9991. stop using those packages and upgrade anyway.
  9992. o Security fixes:
  9993. - Fix an infinite-loop bug on handling corrupt votes under certain
  9994. circumstances. Bugfix on 0.2.0.8-alpha.
  9995. - Fix a temporary DoS vulnerability that could be performed by
  9996. a directory mirror. Bugfix on 0.2.0.9-alpha; reported by lark.
  9997. - Avoid a potential crash on exit nodes when processing malformed
  9998. input. Remote DoS opportunity. Bugfix on 0.2.0.33.
  9999. - Do not accept incomplete ipv4 addresses (like 192.168.0) as valid.
  10000. Spec conformance issue. Bugfix on Tor 0.0.2pre27.
  10001. o Minor bugfixes:
  10002. - Fix compilation on systems where time_t is a 64-bit integer.
  10003. Patch from Matthias Drochner.
  10004. - Don't consider expiring already-closed client connections. Fixes
  10005. bug 893. Bugfix on 0.0.2pre20.
  10006. Changes in version 0.2.0.33 - 2009-01-21
  10007. Tor 0.2.0.33 fixes a variety of bugs that were making relays less
  10008. useful to users. It also finally fixes a bug where a relay or client
  10009. that's been off for many days would take a long time to bootstrap.
  10010. This update also fixes an important security-related bug reported by
  10011. Ilja van Sprundel. You should upgrade. (We'll send out more details
  10012. about the bug once people have had some time to upgrade.)
  10013. o Security fixes:
  10014. - Fix a heap-corruption bug that may be remotely triggerable on
  10015. some platforms. Reported by Ilja van Sprundel.
  10016. o Major bugfixes:
  10017. - When a stream at an exit relay is in state "resolving" or
  10018. "connecting" and it receives an "end" relay cell, the exit relay
  10019. would silently ignore the end cell and not close the stream. If
  10020. the client never closes the circuit, then the exit relay never
  10021. closes the TCP connection. Bug introduced in Tor 0.1.2.1-alpha;
  10022. reported by "wood".
  10023. - When sending CREATED cells back for a given circuit, use a 64-bit
  10024. connection ID to find the right connection, rather than an addr:port
  10025. combination. Now that we can have multiple OR connections between
  10026. the same ORs, it is no longer possible to use addr:port to uniquely
  10027. identify a connection.
  10028. - Bridge relays that had DirPort set to 0 would stop fetching
  10029. descriptors shortly after startup, and then briefly resume
  10030. after a new bandwidth test and/or after publishing a new bridge
  10031. descriptor. Bridge users that try to bootstrap from them would
  10032. get a recent networkstatus but would get descriptors from up to
  10033. 18 hours earlier, meaning most of the descriptors were obsolete
  10034. already. Reported by Tas; bugfix on 0.2.0.13-alpha.
  10035. - Prevent bridge relays from serving their 'extrainfo' document
  10036. to anybody who asks, now that extrainfo docs include potentially
  10037. sensitive aggregated client geoip summaries. Bugfix on
  10038. 0.2.0.13-alpha.
  10039. - If the cached networkstatus consensus is more than five days old,
  10040. discard it rather than trying to use it. In theory it could be
  10041. useful because it lists alternate directory mirrors, but in practice
  10042. it just means we spend many minutes trying directory mirrors that
  10043. are long gone from the network. Also discard router descriptors as
  10044. we load them if they are more than five days old, since the onion
  10045. key is probably wrong by now. Bugfix on 0.2.0.x. Fixes bug 887.
  10046. o Minor bugfixes:
  10047. - Do not mark smartlist_bsearch_idx() function as ATTR_PURE. This bug
  10048. could make gcc generate non-functional binary search code. Bugfix
  10049. on 0.2.0.10-alpha.
  10050. - Build correctly on platforms without socklen_t.
  10051. - Compile without warnings on solaris.
  10052. - Avoid potential crash on internal error during signature collection.
  10053. Fixes bug 864. Patch from rovv.
  10054. - Correct handling of possible malformed authority signing key
  10055. certificates with internal signature types. Fixes bug 880.
  10056. Bugfix on 0.2.0.3-alpha.
  10057. - Fix a hard-to-trigger resource leak when logging credential status.
  10058. CID 349.
  10059. - When we can't initialize DNS because the network is down, do not
  10060. automatically stop Tor from starting. Instead, we retry failed
  10061. dns_init() every 10 minutes, and change the exit policy to reject
  10062. *:* until one succeeds. Fixes bug 691.
  10063. - Use 64 bits instead of 32 bits for connection identifiers used with
  10064. the controller protocol, to greatly reduce risk of identifier reuse.
  10065. - When we're choosing an exit node for a circuit, and we have
  10066. no pending streams, choose a good general exit rather than one that
  10067. supports "all the pending streams". Bugfix on 0.1.1.x. Fix by rovv.
  10068. - Fix another case of assuming, when a specific exit is requested,
  10069. that we know more than the user about what hosts it allows.
  10070. Fixes one case of bug 752. Patch from rovv.
  10071. - Clip the MaxCircuitDirtiness config option to a minimum of 10
  10072. seconds. Warn the user if lower values are given in the
  10073. configuration. Bugfix on 0.1.0.1-rc. Patch by Sebastian.
  10074. - Clip the CircuitBuildTimeout to a minimum of 30 seconds. Warn the
  10075. user if lower values are given in the configuration. Bugfix on
  10076. 0.1.1.17-rc. Patch by Sebastian.
  10077. - Fix a memory leak when we decline to add a v2 rendezvous descriptor to
  10078. the cache because we already had a v0 descriptor with the same ID.
  10079. Bugfix on 0.2.0.18-alpha.
  10080. - Fix a race condition when freeing keys shared between main thread
  10081. and CPU workers that could result in a memory leak. Bugfix on
  10082. 0.1.0.1-rc. Fixes bug 889.
  10083. - Send a valid END cell back when a client tries to connect to a
  10084. nonexistent hidden service port. Bugfix on 0.1.2.15. Fixes bug
  10085. 840. Patch from rovv.
  10086. - Check which hops rendezvous stream cells are associated with to
  10087. prevent possible guess-the-streamid injection attacks from
  10088. intermediate hops. Fixes another case of bug 446. Based on patch
  10089. from rovv.
  10090. - If a broken client asks a non-exit router to connect somewhere,
  10091. do not even do the DNS lookup before rejecting the connection.
  10092. Fixes another case of bug 619. Patch from rovv.
  10093. - When a relay gets a create cell it can't decrypt (e.g. because it's
  10094. using the wrong onion key), we were dropping it and letting the
  10095. client time out. Now actually answer with a destroy cell. Fixes
  10096. bug 904. Bugfix on 0.0.2pre8.
  10097. o Minor bugfixes (hidden services):
  10098. - Do not throw away existing introduction points on SIGHUP. Bugfix on
  10099. 0.0.6pre1. Patch by Karsten. Fixes bug 874.
  10100. o Minor features:
  10101. - Report the case where all signatures in a detached set are rejected
  10102. differently than the case where there is an error handling the
  10103. detached set.
  10104. - When we realize that another process has modified our cached
  10105. descriptors, print out a more useful error message rather than
  10106. triggering an assertion. Fixes bug 885. Patch from Karsten.
  10107. - Implement the 0x20 hack to better resist DNS poisoning: set the
  10108. case on outgoing DNS requests randomly, and reject responses that do
  10109. not match the case correctly. This logic can be disabled with the
  10110. ServerDNSRamdomizeCase setting, if you are using one of the 0.3%
  10111. of servers that do not reliably preserve case in replies. See
  10112. "Increased DNS Forgery Resistance through 0x20-Bit Encoding"
  10113. for more info.
  10114. - Check DNS replies for more matching fields to better resist DNS
  10115. poisoning.
  10116. - Never use OpenSSL compression: it wastes RAM and CPU trying to
  10117. compress cells, which are basically all encrypted, compressed, or
  10118. both.
  10119. Changes in version 0.2.0.32 - 2008-11-20
  10120. Tor 0.2.0.32 fixes a major security problem in Debian and Ubuntu
  10121. packages (and maybe other packages) noticed by Theo de Raadt, fixes
  10122. a smaller security flaw that might allow an attacker to access local
  10123. services, further improves hidden service performance, and fixes a
  10124. variety of other issues.
  10125. o Security fixes:
  10126. - The "User" and "Group" config options did not clear the
  10127. supplementary group entries for the Tor process. The "User" option
  10128. is now more robust, and we now set the groups to the specified
  10129. user's primary group. The "Group" option is now ignored. For more
  10130. detailed logging on credential switching, set CREDENTIAL_LOG_LEVEL
  10131. in common/compat.c to LOG_NOTICE or higher. Patch by Jacob Appelbaum
  10132. and Steven Murdoch. Bugfix on 0.0.2pre14. Fixes bug 848 and 857.
  10133. - The "ClientDNSRejectInternalAddresses" config option wasn't being
  10134. consistently obeyed: if an exit relay refuses a stream because its
  10135. exit policy doesn't allow it, we would remember what IP address
  10136. the relay said the destination address resolves to, even if it's
  10137. an internal IP address. Bugfix on 0.2.0.7-alpha; patch by rovv.
  10138. o Major bugfixes:
  10139. - Fix a DOS opportunity during the voting signature collection process
  10140. at directory authorities. Spotted by rovv. Bugfix on 0.2.0.x.
  10141. o Major bugfixes (hidden services):
  10142. - When fetching v0 and v2 rendezvous service descriptors in parallel,
  10143. we were failing the whole hidden service request when the v0
  10144. descriptor fetch fails, even if the v2 fetch is still pending and
  10145. might succeed. Similarly, if the last v2 fetch fails, we were
  10146. failing the whole hidden service request even if a v0 fetch is
  10147. still pending. Fixes bug 814. Bugfix on 0.2.0.10-alpha.
  10148. - When extending a circuit to a hidden service directory to upload a
  10149. rendezvous descriptor using a BEGIN_DIR cell, almost 1/6 of all
  10150. requests failed, because the router descriptor has not been
  10151. downloaded yet. In these cases, do not attempt to upload the
  10152. rendezvous descriptor, but wait until the router descriptor is
  10153. downloaded and retry. Likewise, do not attempt to fetch a rendezvous
  10154. descriptor from a hidden service directory for which the router
  10155. descriptor has not yet been downloaded. Fixes bug 767. Bugfix
  10156. on 0.2.0.10-alpha.
  10157. o Minor bugfixes:
  10158. - Fix several infrequent memory leaks spotted by Coverity.
  10159. - When testing for libevent functions, set the LDFLAGS variable
  10160. correctly. Found by Riastradh.
  10161. - Avoid a bug where the FastFirstHopPK 0 option would keep Tor from
  10162. bootstrapping with tunneled directory connections. Bugfix on
  10163. 0.1.2.5-alpha. Fixes bug 797. Found by Erwin Lam.
  10164. - When asked to connect to A.B.exit:80, if we don't know the IP for A
  10165. and we know that server B rejects most-but-not all connections to
  10166. port 80, we would previously reject the connection. Now, we assume
  10167. the user knows what they were asking for. Fixes bug 752. Bugfix
  10168. on 0.0.9rc5. Diagnosed by BarkerJr.
  10169. - If we overrun our per-second write limits a little, count this as
  10170. having used up our write allocation for the second, and choke
  10171. outgoing directory writes. Previously, we had only counted this when
  10172. we had met our limits precisely. Fixes bug 824. Patch from by rovv.
  10173. Bugfix on 0.2.0.x (??).
  10174. - Remove the old v2 directory authority 'lefkada' from the default
  10175. list. It has been gone for many months.
  10176. - Stop doing unaligned memory access that generated bus errors on
  10177. sparc64. Bugfix on 0.2.0.10-alpha. Fixes bug 862.
  10178. - Make USR2 log-level switch take effect immediately. Bugfix on
  10179. 0.1.2.8-beta.
  10180. o Minor bugfixes (controller):
  10181. - Make DNS resolved events into "CLOSED", not "FAILED". Bugfix on
  10182. 0.1.2.5-alpha. Fix by Robert Hogan. Resolves bug 807.
  10183. Changes in version 0.2.0.31 - 2008-09-03
  10184. Tor 0.2.0.31 addresses two potential anonymity issues, starts to fix
  10185. a big bug we're seeing where in rare cases traffic from one Tor stream
  10186. gets mixed into another stream, and fixes a variety of smaller issues.
  10187. o Major bugfixes:
  10188. - Make sure that two circuits can never exist on the same connection
  10189. with the same circuit ID, even if one is marked for close. This
  10190. is conceivably a bugfix for bug 779. Bugfix on 0.1.0.4-rc.
  10191. - Relays now reject risky extend cells: if the extend cell includes
  10192. a digest of all zeroes, or asks to extend back to the relay that
  10193. sent the extend cell, tear down the circuit. Ideas suggested
  10194. by rovv.
  10195. - If not enough of our entry guards are available so we add a new
  10196. one, we might use the new one even if it overlapped with the
  10197. current circuit's exit relay (or its family). Anonymity bugfix
  10198. pointed out by rovv.
  10199. o Minor bugfixes:
  10200. - Recover 3-7 bytes that were wasted per memory chunk. Fixes bug
  10201. 794; bug spotted by rovv. Bugfix on 0.2.0.1-alpha.
  10202. - Correctly detect the presence of the linux/netfilter_ipv4.h header
  10203. when building against recent kernels. Bugfix on 0.1.2.1-alpha.
  10204. - Pick size of default geoip filename string correctly on windows.
  10205. Fixes bug 806. Bugfix on 0.2.0.30.
  10206. - Make the autoconf script accept the obsolete --with-ssl-dir
  10207. option as an alias for the actually-working --with-openssl-dir
  10208. option. Fix the help documentation to recommend --with-openssl-dir.
  10209. Based on a patch by "Dave". Bugfix on 0.2.0.1-alpha.
  10210. - When using the TransPort option on OpenBSD, and using the User
  10211. option to change UID and drop privileges, make sure to open
  10212. /dev/pf before dropping privileges. Fixes bug 782. Patch from
  10213. Christopher Davis. Bugfix on 0.1.2.1-alpha.
  10214. - Try to attach connections immediately upon receiving a RENDEZVOUS2
  10215. or RENDEZVOUS_ESTABLISHED cell. This can save a second or two
  10216. on the client side when connecting to a hidden service. Bugfix
  10217. on 0.0.6pre1. Found and fixed by Christian Wilms; resolves bug 743.
  10218. - When closing an application-side connection because its circuit is
  10219. getting torn down, generate the stream event correctly. Bugfix on
  10220. 0.1.2.x. Anonymous patch.
  10221. Changes in version 0.2.0.30 - 2008-07-15
  10222. This new stable release switches to a more efficient directory
  10223. distribution design, adds features to make connections to the Tor
  10224. network harder to block, allows Tor to act as a DNS proxy, adds separate
  10225. rate limiting for relayed traffic to make it easier for clients to
  10226. become relays, fixes a variety of potential anonymity problems, and
  10227. includes the usual huge pile of other features and bug fixes.
  10228. o New v3 directory design:
  10229. - Tor now uses a new way to learn about and distribute information
  10230. about the network: the directory authorities vote on a common
  10231. network status document rather than each publishing their own
  10232. opinion. Now clients and caches download only one networkstatus
  10233. document to bootstrap, rather than downloading one for each
  10234. authority. Clients only download router descriptors listed in
  10235. the consensus. Implements proposal 101; see doc/spec/dir-spec.txt
  10236. for details.
  10237. - Set up moria1, tor26, and dizum as v3 directory authorities
  10238. in addition to being v2 authorities. Also add three new ones:
  10239. ides (run by Mike Perry), gabelmoo (run by Karsten Loesing), and
  10240. dannenberg (run by CCC).
  10241. - Switch to multi-level keys for directory authorities: now their
  10242. long-term identity key can be kept offline, and they periodically
  10243. generate a new signing key. Clients fetch the "key certificates"
  10244. to keep up to date on the right keys. Add a standalone tool
  10245. "tor-gencert" to generate key certificates. Implements proposal 103.
  10246. - Add a new V3AuthUseLegacyKey config option to make it easier for
  10247. v3 authorities to change their identity keys if another bug like
  10248. Debian's OpenSSL RNG flaw appears.
  10249. - Authorities and caches fetch the v2 networkstatus documents
  10250. less often, now that v3 is recommended.
  10251. o Make Tor connections stand out less on the wire:
  10252. - Use an improved TLS handshake designed by Steven Murdoch in proposal
  10253. 124, as revised in proposal 130. The new handshake is meant to
  10254. be harder for censors to fingerprint, and it adds the ability
  10255. to detect certain kinds of man-in-the-middle traffic analysis
  10256. attacks. The new handshake format includes version negotiation for
  10257. OR connections as described in proposal 105, which will allow us
  10258. to improve Tor's link protocol more safely in the future.
  10259. - Enable encrypted directory connections by default for non-relays,
  10260. so censor tools that block Tor directory connections based on their
  10261. plaintext patterns will no longer work. This means Tor works in
  10262. certain censored countries by default again.
  10263. - Stop including recognizeable strings in the commonname part of
  10264. Tor's x509 certificates.
  10265. o Implement bridge relays:
  10266. - Bridge relays (or "bridges" for short) are Tor relays that aren't
  10267. listed in the main Tor directory. Since there is no complete public
  10268. list of them, even an ISP that is filtering connections to all the
  10269. known Tor relays probably won't be able to block all the bridges.
  10270. See doc/design-paper/blocking.pdf and proposal 125 for details.
  10271. - New config option BridgeRelay that specifies you want to be a
  10272. bridge relay rather than a normal relay. When BridgeRelay is set
  10273. to 1, then a) you cache dir info even if your DirPort ins't on,
  10274. and b) the default for PublishServerDescriptor is now "bridge"
  10275. rather than "v2,v3".
  10276. - New config option "UseBridges 1" for clients that want to use bridge
  10277. relays instead of ordinary entry guards. Clients then specify
  10278. bridge relays by adding "Bridge" lines to their config file. Users
  10279. can learn about a bridge relay either manually through word of
  10280. mouth, or by one of our rate-limited mechanisms for giving out
  10281. bridge addresses without letting an attacker easily enumerate them
  10282. all. See https://www.torproject.org/bridges for details.
  10283. - Bridge relays behave like clients with respect to time intervals
  10284. for downloading new v3 consensus documents -- otherwise they
  10285. stand out. Bridge users now wait until the end of the interval,
  10286. so their bridge relay will be sure to have a new consensus document.
  10287. o Implement bridge directory authorities:
  10288. - Bridge authorities are like normal directory authorities, except
  10289. they don't serve a list of known bridges. Therefore users that know
  10290. a bridge's fingerprint can fetch a relay descriptor for that bridge,
  10291. including fetching updates e.g. if the bridge changes IP address,
  10292. yet an attacker can't just fetch a list of all the bridges.
  10293. - Set up Tonga as the default bridge directory authority.
  10294. - Bridge authorities refuse to serve bridge descriptors or other
  10295. bridge information over unencrypted connections (that is, when
  10296. responding to direct DirPort requests rather than begin_dir cells.)
  10297. - Bridge directory authorities do reachability testing on the
  10298. bridges they know. They provide router status summaries to the
  10299. controller via "getinfo ns/purpose/bridge", and also dump summaries
  10300. to a file periodically, so we can keep internal stats about which
  10301. bridges are functioning.
  10302. - If bridge users set the UpdateBridgesFromAuthority config option,
  10303. but the digest they ask for is a 404 on the bridge authority,
  10304. they fall back to contacting the bridge directly.
  10305. - Bridges always use begin_dir to publish their server descriptor to
  10306. the bridge authority using an anonymous encrypted tunnel.
  10307. - Early work on a "bridge community" design: if bridge authorities set
  10308. the BridgePassword config option, they will serve a snapshot of
  10309. known bridge routerstatuses from their DirPort to anybody who
  10310. knows that password. Unset by default.
  10311. - Tor now includes an IP-to-country GeoIP file, so bridge relays can
  10312. report sanitized aggregated summaries in their extra-info documents
  10313. privately to the bridge authority, listing which countries are
  10314. able to reach them. We hope this mechanism will let us learn when
  10315. certain countries start trying to block bridges.
  10316. - Bridge authorities write bridge descriptors to disk, so they can
  10317. reload them after a reboot. They can also export the descriptors
  10318. to other programs, so we can distribute them to blocked users via
  10319. the BridgeDB interface, e.g. via https://bridges.torproject.org/
  10320. and bridges@torproject.org.
  10321. o Tor can be a DNS proxy:
  10322. - The new client-side DNS proxy feature replaces the need for
  10323. dns-proxy-tor: Just set "DNSPort 9999", and Tor will now listen
  10324. for DNS requests on port 9999, use the Tor network to resolve them
  10325. anonymously, and send the reply back like a regular DNS server.
  10326. The code still only implements a subset of DNS.
  10327. - Add a new AutomapHostsOnResolve option: when it is enabled, any
  10328. resolve request for hosts matching a given pattern causes Tor to
  10329. generate an internal virtual address mapping for that host. This
  10330. allows DNSPort to work sensibly with hidden service users. By
  10331. default, .exit and .onion addresses are remapped; the list of
  10332. patterns can be reconfigured with AutomapHostsSuffixes.
  10333. - Add an "-F" option to tor-resolve to force a resolve for a .onion
  10334. address. Thanks to the AutomapHostsOnResolve option, this is no
  10335. longer a completely silly thing to do.
  10336. o Major features (relay usability):
  10337. - New config options RelayBandwidthRate and RelayBandwidthBurst:
  10338. a separate set of token buckets for relayed traffic. Right now
  10339. relayed traffic is defined as answers to directory requests, and
  10340. OR connections that don't have any local circuits on them. See
  10341. proposal 111 for details.
  10342. - Create listener connections before we setuid to the configured
  10343. User and Group. Now non-Windows users can choose port values
  10344. under 1024, start Tor as root, and have Tor bind those ports
  10345. before it changes to another UID. (Windows users could already
  10346. pick these ports.)
  10347. - Added a new ConstrainedSockets config option to set SO_SNDBUF and
  10348. SO_RCVBUF on TCP sockets. Hopefully useful for Tor servers running
  10349. on "vserver" accounts. Patch from coderman.
  10350. o Major features (directory authorities):
  10351. - Directory authorities track weighted fractional uptime and weighted
  10352. mean-time-between failures for relays. WFU is suitable for deciding
  10353. whether a node is "usually up", while MTBF is suitable for deciding
  10354. whether a node is "likely to stay up." We need both, because
  10355. "usually up" is a good requirement for guards, while "likely to
  10356. stay up" is a good requirement for long-lived connections.
  10357. - Directory authorities use a new formula for selecting which relays
  10358. to advertise as Guards: they must be in the top 7/8 in terms of
  10359. how long we have known about them, and above the median of those
  10360. nodes in terms of weighted fractional uptime.
  10361. - Directory authorities use a new formula for selecting which relays
  10362. to advertise as Stable: when we have 4 or more days of data, use
  10363. median measured MTBF rather than median declared uptime. Implements
  10364. proposal 108.
  10365. - Directory authorities accept and serve "extra info" documents for
  10366. routers. Routers now publish their bandwidth-history lines in the
  10367. extra-info docs rather than the main descriptor. This step saves
  10368. 60% (!) on compressed router descriptor downloads. Servers upload
  10369. extra-info docs to any authority that accepts them; directory
  10370. authorities now allow multiple router descriptors and/or extra
  10371. info documents to be uploaded in a single go. Authorities, and
  10372. caches that have been configured to download extra-info documents,
  10373. download them as needed. Implements proposal 104.
  10374. - Authorities now list relays who have the same nickname as
  10375. a different named relay, but list them with a new flag:
  10376. "Unnamed". Now we can make use of relays that happen to pick the
  10377. same nickname as a server that registered two years ago and then
  10378. disappeared. Implements proposal 122.
  10379. - Store routers in a file called cached-descriptors instead of in
  10380. cached-routers. Initialize cached-descriptors from cached-routers
  10381. if the old format is around. The new format allows us to store
  10382. annotations along with descriptors, to record the time we received
  10383. each descriptor, its source, and its purpose: currently one of
  10384. general, controller, or bridge.
  10385. o Major features (other):
  10386. - New config options WarnPlaintextPorts and RejectPlaintextPorts so
  10387. Tor can warn and/or refuse connections to ports commonly used with
  10388. vulnerable-plaintext protocols. Currently we warn on ports 23,
  10389. 109, 110, and 143, but we don't reject any. Based on proposal 129
  10390. by Kevin Bauer and Damon McCoy.
  10391. - Integrate Karsten Loesing's Google Summer of Code project to publish
  10392. hidden service descriptors on a set of redundant relays that are a
  10393. function of the hidden service address. Now we don't have to rely
  10394. on three central hidden service authorities for publishing and
  10395. fetching every hidden service descriptor. Implements proposal 114.
  10396. - Allow tunnelled directory connections to ask for an encrypted
  10397. "begin_dir" connection or an anonymized "uses a full Tor circuit"
  10398. connection independently. Now we can make anonymized begin_dir
  10399. connections for (e.g.) more secure hidden service posting and
  10400. fetching.
  10401. o Major bugfixes (crashes and assert failures):
  10402. - Stop imposing an arbitrary maximum on the number of file descriptors
  10403. used for busy servers. Bug reported by Olaf Selke; patch from
  10404. Sebastian Hahn.
  10405. - Avoid possible failures when generating a directory with routers
  10406. with over-long versions strings, or too many flags set.
  10407. - Fix a rare assert error when we're closing one of our threads:
  10408. use a mutex to protect the list of logs, so we never write to the
  10409. list as it's being freed. Fixes the very rare bug 575, which is
  10410. kind of the revenge of bug 222.
  10411. - Avoid segfault in the case where a badly behaved v2 versioning
  10412. directory sends a signed networkstatus with missing client-versions.
  10413. - When we hit an EOF on a log (probably because we're shutting down),
  10414. don't try to remove the log from the list: just mark it as
  10415. unusable. (Bulletproofs against bug 222.)
  10416. o Major bugfixes (code security fixes):
  10417. - Detect size overflow in zlib code. Reported by Justin Ferguson and
  10418. Dan Kaminsky.
  10419. - Rewrite directory tokenization code to never run off the end of
  10420. a string. Fixes bug 455. Patch from croup.
  10421. - Be more paranoid about overwriting sensitive memory on free(),
  10422. as a defensive programming tactic to ensure forward secrecy.
  10423. o Major bugfixes (anonymity fixes):
  10424. - Reject requests for reverse-dns lookup of names that are in
  10425. a private address space. Patch from lodger.
  10426. - Never report that we've used more bandwidth than we're willing to
  10427. relay: it leaks how much non-relay traffic we're using. Resolves
  10428. bug 516.
  10429. - As a client, do not believe any server that tells us that an
  10430. address maps to an internal address space.
  10431. - Warn about unsafe ControlPort configurations.
  10432. - Directory authorities now call routers Fast if their bandwidth is
  10433. at least 100KB/s, and consider their bandwidth adequate to be a
  10434. Guard if it is at least 250KB/s, no matter the medians. This fix
  10435. complements proposal 107.
  10436. - Directory authorities now never mark more than 2 servers per IP as
  10437. Valid and Running (or 5 on addresses shared by authorities).
  10438. Implements proposal 109, by Kevin Bauer and Damon McCoy.
  10439. - If we're a relay, avoid picking ourselves as an introduction point,
  10440. a rendezvous point, or as the final hop for internal circuits. Bug
  10441. reported by taranis and lodger.
  10442. - Exit relays that are used as a client can now reach themselves
  10443. using the .exit notation, rather than just launching an infinite
  10444. pile of circuits. Fixes bug 641. Reported by Sebastian Hahn.
  10445. - Fix a bug where, when we were choosing the 'end stream reason' to
  10446. put in our relay end cell that we send to the exit relay, Tor
  10447. clients on Windows were sometimes sending the wrong 'reason'. The
  10448. anonymity problem is that exit relays may be able to guess whether
  10449. the client is running Windows, thus helping partition the anonymity
  10450. set. Down the road we should stop sending reasons to exit relays,
  10451. or otherwise prevent future versions of this bug.
  10452. - Only update guard status (usable / not usable) once we have
  10453. enough directory information. This was causing us to discard all our
  10454. guards on startup if we hadn't been running for a few weeks. Fixes
  10455. bug 448.
  10456. - When our directory information has been expired for a while, stop
  10457. being willing to build circuits using it. Fixes bug 401.
  10458. o Major bugfixes (peace of mind for relay operators)
  10459. - Non-exit relays no longer answer "resolve" relay cells, so they
  10460. can't be induced to do arbitrary DNS requests. (Tor clients already
  10461. avoid using non-exit relays for resolve cells, but now servers
  10462. enforce this too.) Fixes bug 619. Patch from lodger.
  10463. - When we setconf ClientOnly to 1, close any current OR and Dir
  10464. listeners. Reported by mwenge.
  10465. o Major bugfixes (other):
  10466. - If we only ever used Tor for hidden service lookups or posts, we
  10467. would stop building circuits and start refusing connections after
  10468. 24 hours, since we falsely believed that Tor was dormant. Reported
  10469. by nwf.
  10470. - Add a new __HashedControlSessionPassword option for controllers
  10471. to use for one-off session password hashes that shouldn't get
  10472. saved to disk by SAVECONF --- Vidalia users were accumulating a
  10473. pile of HashedControlPassword lines in their torrc files, one for
  10474. each time they had restarted Tor and then clicked Save. Make Tor
  10475. automatically convert "HashedControlPassword" to this new option but
  10476. only when it's given on the command line. Partial fix for bug 586.
  10477. - Patch from "Andrew S. Lists" to catch when we contact a directory
  10478. mirror at IP address X and he says we look like we're coming from
  10479. IP address X. Otherwise this would screw up our address detection.
  10480. - Reject uploaded descriptors and extrainfo documents if they're
  10481. huge. Otherwise we'll cache them all over the network and it'll
  10482. clog everything up. Suggested by Aljosha Judmayer.
  10483. - When a hidden service was trying to establish an introduction point,
  10484. and Tor *did* manage to reuse one of the preemptively built
  10485. circuits, it didn't correctly remember which one it used,
  10486. so it asked for another one soon after, until there were no
  10487. more preemptive circuits, at which point it launched one from
  10488. scratch. Bugfix on 0.0.9.x.
  10489. o Rate limiting and load balancing improvements:
  10490. - When we add data to a write buffer in response to the data on that
  10491. write buffer getting low because of a flush, do not consider the
  10492. newly added data as a candidate for immediate flushing, but rather
  10493. make it wait until the next round of writing. Otherwise, we flush
  10494. and refill recursively, and a single greedy TLS connection can
  10495. eat all of our bandwidth.
  10496. - When counting the number of bytes written on a TLS connection,
  10497. look at the BIO actually used for writing to the network, not
  10498. at the BIO used (sometimes) to buffer data for the network.
  10499. Looking at different BIOs could result in write counts on the
  10500. order of ULONG_MAX. Fixes bug 614.
  10501. - If we change our MaxAdvertisedBandwidth and then reload torrc,
  10502. Tor won't realize it should publish a new relay descriptor. Fixes
  10503. bug 688, reported by mfr.
  10504. - Avoid using too little bandwidth when our clock skips a few seconds.
  10505. - Choose which bridge to use proportional to its advertised bandwidth,
  10506. rather than uniformly at random. This should speed up Tor for
  10507. bridge users. Also do this for people who set StrictEntryNodes.
  10508. o Bootstrapping faster and building circuits more intelligently:
  10509. - Fix bug 660 that was preventing us from knowing that we should
  10510. preemptively build circuits to handle expected directory requests.
  10511. - When we're checking if we have enough dir info for each relay
  10512. to begin establishing circuits, make sure that we actually have
  10513. the descriptor listed in the consensus, not just any descriptor.
  10514. - Correctly notify one-hop connections when a circuit build has
  10515. failed. Possible fix for bug 669. Found by lodger.
  10516. - Clients now hold circuitless TLS connections open for 1.5 times
  10517. MaxCircuitDirtiness (15 minutes), since it is likely that they'll
  10518. rebuild a new circuit over them within that timeframe. Previously,
  10519. they held them open only for KeepalivePeriod (5 minutes).
  10520. o Performance improvements (memory):
  10521. - Add OpenBSD malloc code from "phk" as an optional malloc
  10522. replacement on Linux: some glibc libraries do very poorly with
  10523. Tor's memory allocation patterns. Pass --enable-openbsd-malloc to
  10524. ./configure to get the replacement malloc code.
  10525. - Switch our old ring buffer implementation for one more like that
  10526. used by free Unix kernels. The wasted space in a buffer with 1mb
  10527. of data will now be more like 8k than 1mb. The new implementation
  10528. also avoids realloc();realloc(); patterns that can contribute to
  10529. memory fragmentation.
  10530. - Change the way that Tor buffers data that it is waiting to write.
  10531. Instead of queueing data cells in an enormous ring buffer for each
  10532. client->OR or OR->OR connection, we now queue cells on a separate
  10533. queue for each circuit. This lets us use less slack memory, and
  10534. will eventually let us be smarter about prioritizing different kinds
  10535. of traffic.
  10536. - Reference-count and share copies of address policy entries; only 5%
  10537. of them were actually distinct.
  10538. - Tune parameters for cell pool allocation to minimize amount of
  10539. RAM overhead used.
  10540. - Keep unused 4k and 16k buffers on free lists, rather than wasting 8k
  10541. for every single inactive connection_t. Free items from the
  10542. 4k/16k-buffer free lists when they haven't been used for a while.
  10543. - Make memory debugging information describe more about history
  10544. of cell allocation, so we can help reduce our memory use.
  10545. - Be even more aggressive about releasing RAM from small
  10546. empty buffers. Thanks to our free-list code, this shouldn't be too
  10547. performance-intensive.
  10548. - Log malloc statistics from mallinfo() on platforms where it exists.
  10549. - Use memory pools to allocate cells with better speed and memory
  10550. efficiency, especially on platforms where malloc() is inefficient.
  10551. - Add a --with-tcmalloc option to the configure script to link
  10552. against tcmalloc (if present). Does not yet search for non-system
  10553. include paths.
  10554. o Performance improvements (socket management):
  10555. - Count the number of open sockets separately from the number of
  10556. active connection_t objects. This will let us avoid underusing
  10557. our allocated connection limit.
  10558. - We no longer use socket pairs to link an edge connection to an
  10559. anonymous directory connection or a DirPort test connection.
  10560. Instead, we track the link internally and transfer the data
  10561. in-process. This saves two sockets per "linked" connection (at the
  10562. client and at the server), and avoids the nasty Windows socketpair()
  10563. workaround.
  10564. - We were leaking a file descriptor if Tor started with a zero-length
  10565. cached-descriptors file. Patch by "freddy77".
  10566. o Performance improvements (CPU use):
  10567. - Never walk through the list of logs if we know that no log target
  10568. is interested in a given message.
  10569. - Call routerlist_remove_old_routers() much less often. This should
  10570. speed startup, especially on directory caches.
  10571. - Base64 decoding was actually showing up on our profile when parsing
  10572. the initial descriptor file; switch to an in-process all-at-once
  10573. implementation that's about 3.5x times faster than calling out to
  10574. OpenSSL.
  10575. - Use a slightly simpler string hashing algorithm (copying Python's
  10576. instead of Java's) and optimize our digest hashing algorithm to take
  10577. advantage of 64-bit platforms and to remove some possibly-costly
  10578. voodoo.
  10579. - When implementing AES counter mode, update only the portions of the
  10580. counter buffer that need to change, and don't keep separate
  10581. network-order and host-order counters on big-endian hosts (where
  10582. they are the same).
  10583. - Add an in-place version of aes_crypt() so that we can avoid doing a
  10584. needless memcpy() call on each cell payload.
  10585. - Use Critical Sections rather than Mutexes for synchronizing threads
  10586. on win32; Mutexes are heavier-weight, and designed for synchronizing
  10587. between processes.
  10588. o Performance improvements (bandwidth use):
  10589. - Don't try to launch new descriptor downloads quite so often when we
  10590. already have enough directory information to build circuits.
  10591. - Version 1 directories are no longer generated in full. Instead,
  10592. authorities generate and serve "stub" v1 directories that list
  10593. no servers. This will stop Tor versions 0.1.0.x and earlier from
  10594. working, but (for security reasons) nobody should be running those
  10595. versions anyway.
  10596. - Avoid going directly to the directory authorities even if you're a
  10597. relay, if you haven't found yourself reachable yet or if you've
  10598. decided not to advertise your dirport yet. Addresses bug 556.
  10599. - If we've gone 12 hours since our last bandwidth check, and we
  10600. estimate we have less than 50KB bandwidth capacity but we could
  10601. handle more, do another bandwidth test.
  10602. - Support "If-Modified-Since" when answering HTTP requests for
  10603. directories, running-routers documents, and v2 and v3 networkstatus
  10604. documents. (There's no need to support it for router descriptors,
  10605. since those are downloaded by descriptor digest.)
  10606. - Stop fetching directory info so aggressively if your DirPort is
  10607. on but your ORPort is off; stop fetching v2 dir info entirely.
  10608. You can override these choices with the new FetchDirInfoEarly
  10609. config option.
  10610. o Changed config option behavior (features):
  10611. - Configuration files now accept C-style strings as values. This
  10612. helps encode characters not allowed in the current configuration
  10613. file format, such as newline or #. Addresses bug 557.
  10614. - Add hidden services and DNSPorts to the list of things that make
  10615. Tor accept that it has running ports. Change starting Tor with no
  10616. ports from a fatal error to a warning; we might change it back if
  10617. this turns out to confuse anybody. Fixes bug 579.
  10618. - Make PublishServerDescriptor default to 1, so the default doesn't
  10619. have to change as we invent new directory protocol versions.
  10620. - Allow people to say PreferTunnelledDirConns rather than
  10621. PreferTunneledDirConns, for those alternate-spellers out there.
  10622. - Raise the default BandwidthRate/BandwidthBurst to 5MB/10MB, to
  10623. accommodate the growing number of servers that use the default
  10624. and are reaching it.
  10625. - Make it possible to enable HashedControlPassword and
  10626. CookieAuthentication at the same time.
  10627. - When a TrackHostExits-chosen exit fails too many times in a row,
  10628. stop using it. Fixes bug 437.
  10629. o Changed config option behavior (bugfixes):
  10630. - Do not read the configuration file when we've only been told to
  10631. generate a password hash. Fixes bug 643. Bugfix on 0.0.9pre5. Fix
  10632. based on patch from Sebastian Hahn.
  10633. - Actually validate the options passed to AuthDirReject,
  10634. AuthDirInvalid, AuthDirBadDir, and AuthDirBadExit.
  10635. - Make "ClientOnly 1" config option disable directory ports too.
  10636. - Don't stop fetching descriptors when FetchUselessDescriptors is
  10637. set, even if we stop asking for circuits. Bug reported by tup
  10638. and ioerror.
  10639. - Servers used to decline to publish their DirPort if their
  10640. BandwidthRate or MaxAdvertisedBandwidth were below a threshold. Now
  10641. they look only at BandwidthRate and RelayBandwidthRate.
  10642. - Treat "2gb" when given in torrc for a bandwidth as meaning 2gb,
  10643. minus 1 byte: the actual maximum declared bandwidth.
  10644. - Make "TrackHostExits ." actually work. Bugfix on 0.1.0.x.
  10645. - Make the NodeFamilies config option work. (Reported by
  10646. lodger -- it has never actually worked, even though we added it
  10647. in Oct 2004.)
  10648. - If Tor is invoked from something that isn't a shell (e.g. Vidalia),
  10649. now we expand "-f ~/.tor/torrc" correctly. Suggested by Matt Edman.
  10650. o New config options:
  10651. - New configuration options AuthDirMaxServersPerAddr and
  10652. AuthDirMaxServersperAuthAddr to override default maximum number
  10653. of servers allowed on a single IP address. This is important for
  10654. running a test network on a single host.
  10655. - Three new config options (AlternateDirAuthority,
  10656. AlternateBridgeAuthority, and AlternateHSAuthority) that let the
  10657. user selectively replace the default directory authorities by type,
  10658. rather than the all-or-nothing replacement that DirServer offers.
  10659. - New config options AuthDirBadDir and AuthDirListBadDirs for
  10660. authorities to mark certain relays as "bad directories" in the
  10661. networkstatus documents. Also supports the "!baddir" directive in
  10662. the approved-routers file.
  10663. - New config option V2AuthoritativeDirectory that all v2 directory
  10664. authorities must set. This lets v3 authorities choose not to serve
  10665. v2 directory information.
  10666. o Minor features (other):
  10667. - When we're not serving v2 directory information, there is no reason
  10668. to actually keep any around. Remove the obsolete files and directory
  10669. on startup if they are very old and we aren't going to serve them.
  10670. - When we negotiate a v2 link-layer connection (not yet implemented),
  10671. accept RELAY_EARLY cells and turn them into RELAY cells if we've
  10672. negotiated a v1 connection for their next step. Initial steps for
  10673. proposal 110.
  10674. - When we have no consensus, check FallbackNetworkstatusFile (defaults
  10675. to $PREFIX/share/tor/fallback-consensus) for a consensus. This way
  10676. we can start out knowing some directory caches. We don't ship with
  10677. a fallback consensus by default though, because it was making
  10678. bootstrapping take too long while we tried many down relays.
  10679. - Authorities send back an X-Descriptor-Not-New header in response to
  10680. an accepted-but-discarded descriptor upload. Partially implements
  10681. fix for bug 535.
  10682. - If we find a cached-routers file that's been sitting around for more
  10683. than 28 days unmodified, then most likely it's a leftover from
  10684. when we upgraded to 0.2.0.8-alpha. Remove it. It has no good
  10685. routers anyway.
  10686. - When we (as a cache) download a descriptor because it was listed
  10687. in a consensus, remember when the consensus was supposed to expire,
  10688. and don't expire the descriptor until then.
  10689. - Optionally (if built with -DEXPORTMALLINFO) export the output
  10690. of mallinfo via http, as tor/mallinfo.txt. Only accessible
  10691. from localhost.
  10692. - Tag every guard node in our state file with the version that
  10693. we believe added it, or with our own version if we add it. This way,
  10694. if a user temporarily runs an old version of Tor and then switches
  10695. back to a new one, she doesn't automatically lose her guards.
  10696. - When somebody requests a list of statuses or servers, and we have
  10697. none of those, return a 404 rather than an empty 200.
  10698. - Merge in some (as-yet-unused) IPv6 address manipulation code. (Patch
  10699. from croup.)
  10700. - Add an HSAuthorityRecordStats option that hidden service authorities
  10701. can use to track statistics of overall hidden service usage without
  10702. logging information that would be as useful to an attacker.
  10703. - Allow multiple HiddenServicePort directives with the same virtual
  10704. port; when they occur, the user is sent round-robin to one
  10705. of the target ports chosen at random. Partially fixes bug 393 by
  10706. adding limited ad-hoc round-robining.
  10707. - Revamp file-writing logic so we don't need to have the entire
  10708. contents of a file in memory at once before we write to disk. Tor,
  10709. meet stdio.
  10710. o Minor bugfixes (other):
  10711. - Alter the code that tries to recover from unhandled write
  10712. errors, to not try to flush onto a socket that's given us
  10713. unhandled errors.
  10714. - Directory mirrors no longer include a guess at the client's IP
  10715. address if the connection appears to be coming from the same /24
  10716. network; it was producing too many wrong guesses.
  10717. - If we're trying to flush the last bytes on a connection (for
  10718. example, when answering a directory request), reset the
  10719. time-to-give-up timeout every time we manage to write something
  10720. on the socket.
  10721. - Reject router descriptors with out-of-range bandwidthcapacity or
  10722. bandwidthburst values.
  10723. - If we can't expand our list of entry guards (e.g. because we're
  10724. using bridges or we have StrictEntryNodes set), don't mark relays
  10725. down when they fail a directory request. Otherwise we're too quick
  10726. to mark all our entry points down.
  10727. - Authorities no longer send back "400 you're unreachable please fix
  10728. it" errors to Tor servers that aren't online all the time. We're
  10729. supposed to tolerate these servers now.
  10730. - Let directory authorities startup even when they can't generate
  10731. a descriptor immediately, e.g. because they don't know their
  10732. address.
  10733. - Correctly enforce that elements of directory objects do not appear
  10734. more often than they are allowed to appear.
  10735. - Stop allowing hibernating servers to be "stable" or "fast".
  10736. - On Windows, we were preventing other processes from reading
  10737. cached-routers while Tor was running. (Reported by janbar)
  10738. - Check return values from pthread_mutex functions.
  10739. - When opening /dev/null in finish_daemonize(), do not pass the
  10740. O_CREAT flag. Fortify was complaining, and correctly so. Fixes
  10741. bug 742; fix from Michael Scherer. Bugfix on 0.0.2pre19.
  10742. o Controller features:
  10743. - The GETCONF command now escapes and quotes configuration values
  10744. that don't otherwise fit into the torrc file.
  10745. - The SETCONF command now handles quoted values correctly.
  10746. - Add "GETINFO/desc-annotations/id/<OR digest>" so controllers can
  10747. ask about source, timestamp of arrival, purpose, etc. We need
  10748. something like this to help Vidalia not do GeoIP lookups on bridge
  10749. addresses.
  10750. - Allow multiple HashedControlPassword config lines, to support
  10751. multiple controller passwords.
  10752. - Accept LF instead of CRLF on controller, since some software has a
  10753. hard time generating real Internet newlines.
  10754. - Add GETINFO values for the server status events
  10755. "REACHABILITY_SUCCEEDED" and "GOOD_SERVER_DESCRIPTOR". Patch from
  10756. Robert Hogan.
  10757. - There is now an ugly, temporary "desc/all-recent-extrainfo-hack"
  10758. GETINFO for Torstat to use until it can switch to using extrainfos.
  10759. - New config option CookieAuthFile to choose a new location for the
  10760. cookie authentication file, and config option
  10761. CookieAuthFileGroupReadable to make it group-readable.
  10762. - Add a SOURCE_ADDR field to STREAM NEW events so that controllers can
  10763. match requests to applications. Patch from Robert Hogan.
  10764. - Add a RESOLVE command to launch hostname lookups. Original patch
  10765. from Robert Hogan.
  10766. - Add GETINFO status/enough-dir-info to let controllers tell whether
  10767. Tor has downloaded sufficient directory information. Patch from Tup.
  10768. - You can now use the ControlSocket option to tell Tor to listen for
  10769. controller connections on Unix domain sockets on systems that
  10770. support them. Patch from Peter Palfrader.
  10771. - New "GETINFO address-mappings/*" command to get address mappings
  10772. with expiry information. "addr-mappings/*" is now deprecated.
  10773. Patch from Tup.
  10774. - Add a new config option __DisablePredictedCircuits designed for
  10775. use by the controller, when we don't want Tor to build any circuits
  10776. preemptively.
  10777. - Let the controller specify HOP=%d as an argument to ATTACHSTREAM,
  10778. so we can exit from the middle of the circuit.
  10779. - Implement "getinfo status/circuit-established".
  10780. - Implement "getinfo status/version/..." so a controller can tell
  10781. whether the current version is recommended, and whether any versions
  10782. are good, and how many authorities agree. Patch from "shibz".
  10783. - Controllers should now specify cache=no or cache=yes when using
  10784. the +POSTDESCRIPTOR command.
  10785. - Add a "PURPOSE=" argument to "STREAM NEW" events, as suggested by
  10786. Robert Hogan. Fixes the first part of bug 681.
  10787. - When reporting clock skew, and we know that the clock is _at least
  10788. as skewed_ as some value, but we don't know the actual value,
  10789. report the value as a "minimum skew."
  10790. o Controller bugfixes:
  10791. - Generate "STATUS_SERVER" events rather than misspelled
  10792. "STATUS_SEVER" events. Caught by mwenge.
  10793. - Reject controller commands over 1MB in length, so rogue
  10794. processes can't run us out of memory.
  10795. - Change the behavior of "getinfo status/good-server-descriptor"
  10796. so it doesn't return failure when any authority disappears.
  10797. - Send NAMESERVER_STATUS messages for a single failed nameserver
  10798. correctly.
  10799. - When the DANGEROUS_VERSION controller status event told us we're
  10800. running an obsolete version, it used the string "OLD" to describe
  10801. it. Yet the "getinfo" interface used the string "OBSOLETE". Now use
  10802. "OBSOLETE" in both cases.
  10803. - Respond to INT and TERM SIGNAL commands before we execute the
  10804. signal, in case the signal shuts us down. We had a patch in
  10805. 0.1.2.1-alpha that tried to do this by queueing the response on
  10806. the connection's buffer before shutting down, but that really
  10807. isn't the same thing at all. Bug located by Matt Edman.
  10808. - Provide DNS expiry times in GMT, not in local time. For backward
  10809. compatibility, ADDRMAP events only provide GMT expiry in an extended
  10810. field. "GETINFO address-mappings" always does the right thing.
  10811. - Use CRLF line endings properly in NS events.
  10812. - Make 'getinfo fingerprint' return a 551 error if we're not a
  10813. server, so we match what the control spec claims we do. Reported
  10814. by daejees.
  10815. - Fix a typo in an error message when extendcircuit fails that
  10816. caused us to not follow the \r\n-based delimiter protocol. Reported
  10817. by daejees.
  10818. - When tunneling an encrypted directory connection, and its first
  10819. circuit fails, do not leave it unattached and ask the controller
  10820. to deal. Fixes the second part of bug 681.
  10821. - Treat some 403 responses from directory servers as INFO rather than
  10822. WARN-severity events.
  10823. o Portability / building / compiling:
  10824. - When building with --enable-gcc-warnings, check for whether Apple's
  10825. warning "-Wshorten-64-to-32" is available.
  10826. - Support compilation to target iPhone; patch from cjacker huang.
  10827. To build for iPhone, pass the --enable-iphone option to configure.
  10828. - Port Tor to build and run correctly on Windows CE systems, using
  10829. the wcecompat library. Contributed by Valerio Lupi.
  10830. - Detect non-ASCII platforms (if any still exist) and refuse to
  10831. build there: some of our code assumes that 'A' is 65 and so on.
  10832. - Clear up some MIPSPro compiler warnings.
  10833. - Make autoconf search for libevent, openssl, and zlib consistently.
  10834. - Update deprecated macros in configure.in.
  10835. - When warning about missing headers, tell the user to let us
  10836. know if the compile succeeds anyway, so we can downgrade the
  10837. warning.
  10838. - Include the current subversion revision as part of the version
  10839. string: either fetch it directly if we're in an SVN checkout, do
  10840. some magic to guess it if we're in an SVK checkout, or use
  10841. the last-detected version if we're building from a .tar.gz.
  10842. Use this version consistently in log messages.
  10843. - Correctly report platform name on Windows 95 OSR2 and Windows 98 SE.
  10844. - Read resolv.conf files correctly on platforms where read() returns
  10845. partial results on small file reads.
  10846. - Build without verbose warnings even on gcc 4.2 and 4.3.
  10847. - On Windows, correctly detect errors when listing the contents of
  10848. a directory. Fix from lodger.
  10849. - Run 'make test' as part of 'make dist', so we stop releasing so
  10850. many development snapshots that fail their unit tests.
  10851. - Add support to detect Libevent versions in the 1.4.x series
  10852. on mingw.
  10853. - Add command-line arguments to unit-test executable so that we can
  10854. invoke any chosen test from the command line rather than having
  10855. to run the whole test suite at once; and so that we can turn on
  10856. logging for the unit tests.
  10857. - Do not automatically run configure from autogen.sh. This
  10858. non-standard behavior tended to annoy people who have built other
  10859. programs.
  10860. - Fix a macro/CPP interaction that was confusing some compilers:
  10861. some GCCs don't like #if/#endif pairs inside macro arguments.
  10862. Fixes bug 707.
  10863. - Fix macro collision between OpenSSL 0.9.8h and Windows headers.
  10864. Fixes bug 704; fix from Steven Murdoch.
  10865. - Correctly detect transparent proxy support on Linux hosts that
  10866. require in.h to be included before netfilter_ipv4.h. Patch
  10867. from coderman.
  10868. o Logging improvements:
  10869. - When we haven't had any application requests lately, don't bother
  10870. logging that we have expired a bunch of descriptors.
  10871. - When attempting to open a logfile fails, tell us why.
  10872. - Only log guard node status when guard node status has changed.
  10873. - Downgrade the 3 most common "INFO" messages to "DEBUG". This will
  10874. make "INFO" 75% less verbose.
  10875. - When SafeLogging is disabled, log addresses along with all TLS
  10876. errors.
  10877. - Report TLS "zero return" case as a "clean close" and "IO error"
  10878. as a "close". Stop calling closes "unexpected closes": existing
  10879. Tors don't use SSL_close(), so having a connection close without
  10880. the TLS shutdown handshake is hardly unexpected.
  10881. - When we receive a consensus from the future, warn about skew.
  10882. - Make "not enough dir info yet" warnings describe *why* Tor feels
  10883. it doesn't have enough directory info yet.
  10884. - On the USR1 signal, when dmalloc is in use, log the top 10 memory
  10885. consumers. (We already do this on HUP.)
  10886. - Give more descriptive well-formedness errors for out-of-range
  10887. hidden service descriptor/protocol versions.
  10888. - Stop recommending that every server operator send mail to tor-ops.
  10889. Resolves bug 597. Bugfix on 0.1.2.x.
  10890. - Improve skew reporting: try to give the user a better log message
  10891. about how skewed they are, and how much this matters.
  10892. - New --quiet command-line option to suppress the default console log.
  10893. Good in combination with --hash-password.
  10894. - Don't complain that "your server has not managed to confirm that its
  10895. ports are reachable" if we haven't been able to build any circuits
  10896. yet.
  10897. - Detect the reason for failing to mmap a descriptor file we just
  10898. wrote, and give a more useful log message. Fixes bug 533.
  10899. - Always prepend "Bug: " to any log message about a bug.
  10900. - When dumping memory usage, list bytes used in buffer memory
  10901. free-lists.
  10902. - When running with dmalloc, dump more stats on hup and on exit.
  10903. - Put a platform string (e.g. "Linux i686") in the startup log
  10904. message, so when people paste just their logs, we know if it's
  10905. OpenBSD or Windows or what.
  10906. - When logging memory usage, break down memory used in buffers by
  10907. buffer type.
  10908. - When we are reporting the DirServer line we just parsed, we were
  10909. logging the second stanza of the key fingerprint, not the first.
  10910. - Even though Windows is equally happy with / and \ as path separators,
  10911. try to use \ consistently on Windows and / consistently on Unix: it
  10912. makes the log messages nicer.
  10913. - On OSX, stop warning the user that kqueue support in libevent is
  10914. "experimental", since it seems to have worked fine for ages.
  10915. o Contributed scripts and tools:
  10916. - Update linux-tor-prio.sh script to allow QoS based on the uid of
  10917. the Tor process. Patch from Marco Bonetti with tweaks from Mike
  10918. Perry.
  10919. - Include the "tor-ctrl.sh" bash script by Stefan Behte to provide
  10920. Unix users an easy way to script their Tor process (e.g. by
  10921. adjusting bandwidth based on the time of the day).
  10922. - In the exitlist script, only consider the most recently published
  10923. server descriptor for each server. Also, when the user requests
  10924. a list of servers that _reject_ connections to a given address,
  10925. explicitly exclude the IPs that also have servers that accept
  10926. connections to that address. Resolves bug 405.
  10927. - Include a new contrib/tor-exit-notice.html file that exit relay
  10928. operators can put on their website to help reduce abuse queries.
  10929. o Newly deprecated features:
  10930. - The status/version/num-versioning and status/version/num-concurring
  10931. GETINFO controller options are no longer useful in the v3 directory
  10932. protocol: treat them as deprecated, and warn when they're used.
  10933. - The RedirectExits config option is now deprecated.
  10934. o Removed features:
  10935. - Drop the old code to choke directory connections when the
  10936. corresponding OR connections got full: thanks to the cell queue
  10937. feature, OR conns don't get full any more.
  10938. - Remove the old "dns worker" server DNS code: it hasn't been default
  10939. since 0.1.2.2-alpha, and all the servers are using the new
  10940. eventdns code.
  10941. - Remove the code to generate the oldest (v1) directory format.
  10942. - Remove support for the old bw_accounting file: we've been storing
  10943. bandwidth accounting information in the state file since
  10944. 0.1.2.5-alpha. This may result in bandwidth accounting errors
  10945. if you try to upgrade from 0.1.1.x or earlier, or if you try to
  10946. downgrade to 0.1.1.x or earlier.
  10947. - Drop support for OpenSSL version 0.9.6. Just about nobody was using
  10948. it, it had no AES, and it hasn't seen any security patches since
  10949. 2004.
  10950. - Stop overloading the circuit_t.onionskin field for both "onionskin
  10951. from a CREATE cell that we are waiting for a cpuworker to be
  10952. assigned" and "onionskin from an EXTEND cell that we are going to
  10953. send to an OR as soon as we are connected". Might help with bug 600.
  10954. - Remove the tor_strpartition() function: its logic was confused,
  10955. and it was only used for one thing that could be implemented far
  10956. more easily.
  10957. - Remove the contrib scripts ExerciseServer.py, PathDemo.py,
  10958. and TorControl.py, as they use the old v0 controller protocol,
  10959. and are obsoleted by TorFlow anyway.
  10960. - Drop support for v1 rendezvous descriptors, since we never used
  10961. them anyway, and the code has probably rotted by now. Based on
  10962. patch from Karsten Loesing.
  10963. - Stop allowing address masks that do not correspond to bit prefixes.
  10964. We have warned about these for a really long time; now it's time
  10965. to reject them. (Patch from croup.)
  10966. - Remove an optimization in the AES counter-mode code that assumed
  10967. that the counter never exceeded 2^68. When the counter can be set
  10968. arbitrarily as an IV (as it is by Karsten's new hidden services
  10969. code), this assumption no longer holds.
  10970. - Disable the SETROUTERPURPOSE controller command: it is now
  10971. obsolete.
  10972. Changes in version 0.1.2.19 - 2008-01-17
  10973. Tor 0.1.2.19 fixes a huge memory leak on exit relays, makes the default
  10974. exit policy a little bit more conservative so it's safer to run an
  10975. exit relay on a home system, and fixes a variety of smaller issues.
  10976. o Security fixes:
  10977. - Exit policies now reject connections that are addressed to a
  10978. relay's public (external) IP address too, unless
  10979. ExitPolicyRejectPrivate is turned off. We do this because too
  10980. many relays are running nearby to services that trust them based
  10981. on network address.
  10982. o Major bugfixes:
  10983. - When the clock jumps forward a lot, do not allow the bandwidth
  10984. buckets to become negative. Fixes bug 544.
  10985. - Fix a memory leak on exit relays; we were leaking a cached_resolve_t
  10986. on every successful resolve. Reported by Mike Perry.
  10987. - Purge old entries from the "rephist" database and the hidden
  10988. service descriptor database even when DirPort is zero.
  10989. - Stop thinking that 0.1.2.x directory servers can handle "begin_dir"
  10990. requests. Should ease bugs 406 and 419 where 0.1.2.x relays are
  10991. crashing or mis-answering these requests.
  10992. - When we decide to send a 503 response to a request for servers, do
  10993. not then also send the server descriptors: this defeats the whole
  10994. purpose. Fixes bug 539.
  10995. o Minor bugfixes:
  10996. - Changing the ExitPolicyRejectPrivate setting should cause us to
  10997. rebuild our server descriptor.
  10998. - Fix handling of hex nicknames when answering controller requests for
  10999. networkstatus by name, or when deciding whether to warn about
  11000. unknown routers in a config option. (Patch from mwenge.)
  11001. - Fix a couple of hard-to-trigger autoconf problems that could result
  11002. in really weird results on platforms whose sys/types.h files define
  11003. nonstandard integer types.
  11004. - Don't try to create the datadir when running --verify-config or
  11005. --hash-password. Resolves bug 540.
  11006. - If we were having problems getting a particular descriptor from the
  11007. directory caches, and then we learned about a new descriptor for
  11008. that router, we weren't resetting our failure count. Reported
  11009. by lodger.
  11010. - Although we fixed bug 539 (where servers would send HTTP status 503
  11011. responses _and_ send a body too), there are still servers out there
  11012. that haven't upgraded. Therefore, make clients parse such bodies
  11013. when they receive them.
  11014. - Run correctly on systems where rlim_t is larger than unsigned long.
  11015. This includes some 64-bit systems.
  11016. - Run correctly on platforms (like some versions of OS X 10.5) where
  11017. the real limit for number of open files is OPEN_FILES, not rlim_max
  11018. from getrlimit(RLIMIT_NOFILES).
  11019. - Avoid a spurious free on base64 failure.
  11020. - Avoid segfaults on certain complex invocations of
  11021. router_get_by_hexdigest().
  11022. - Fix rare bug on REDIRECTSTREAM control command when called with no
  11023. port set: it could erroneously report an error when none had
  11024. happened.
  11025. Changes in version 0.1.2.18 - 2007-10-28
  11026. Tor 0.1.2.18 fixes many problems including crash bugs, problems with
  11027. hidden service introduction that were causing huge delays, and a big
  11028. bug that was causing some servers to disappear from the network status
  11029. lists for a few hours each day.
  11030. o Major bugfixes (crashes):
  11031. - If a connection is shut down abruptly because of something that
  11032. happened inside connection_flushed_some(), do not call
  11033. connection_finished_flushing(). Should fix bug 451:
  11034. "connection_stop_writing: Assertion conn->write_event failed"
  11035. Bugfix on 0.1.2.7-alpha.
  11036. - Fix possible segfaults in functions called from
  11037. rend_process_relay_cell().
  11038. o Major bugfixes (hidden services):
  11039. - Hidden services were choosing introduction points uniquely by
  11040. hexdigest, but when constructing the hidden service descriptor
  11041. they merely wrote the (potentially ambiguous) nickname.
  11042. - Clients now use the v2 intro format for hidden service
  11043. connections: they specify their chosen rendezvous point by identity
  11044. digest rather than by (potentially ambiguous) nickname. These
  11045. changes could speed up hidden service connections dramatically.
  11046. o Major bugfixes (other):
  11047. - Stop publishing a new server descriptor just because we get a
  11048. HUP signal. This led (in a roundabout way) to some servers getting
  11049. dropped from the networkstatus lists for a few hours each day.
  11050. - When looking for a circuit to cannibalize, consider family as well
  11051. as identity. Fixes bug 438. Bugfix on 0.1.0.x (which introduced
  11052. circuit cannibalization).
  11053. - When a router wasn't listed in a new networkstatus, we were leaving
  11054. the flags for that router alone -- meaning it remained Named,
  11055. Running, etc -- even though absence from the networkstatus means
  11056. that it shouldn't be considered to exist at all anymore. Now we
  11057. clear all the flags for routers that fall out of the networkstatus
  11058. consensus. Fixes bug 529.
  11059. o Minor bugfixes:
  11060. - Don't try to access (or alter) the state file when running
  11061. --list-fingerprint or --verify-config or --hash-password. Resolves
  11062. bug 499.
  11063. - When generating information telling us how to extend to a given
  11064. router, do not try to include the nickname if it is
  11065. absent. Resolves bug 467.
  11066. - Fix a user-triggerable segfault in expand_filename(). (There isn't
  11067. a way to trigger this remotely.)
  11068. - When sending a status event to the controller telling it that an
  11069. OR address is reachable, set the port correctly. (Previously we
  11070. were reporting the dir port.)
  11071. - Fix a minor memory leak whenever a controller sends the PROTOCOLINFO
  11072. command. Bugfix on 0.1.2.17.
  11073. - When loading bandwidth history, do not believe any information in
  11074. the future. Fixes bug 434.
  11075. - When loading entry guard information, do not believe any information
  11076. in the future.
  11077. - When we have our clock set far in the future and generate an
  11078. onion key, then re-set our clock to be correct, we should not stop
  11079. the onion key from getting rotated.
  11080. - On some platforms, accept() can return a broken address. Detect
  11081. this more quietly, and deal accordingly. Fixes bug 483.
  11082. - It's not actually an error to find a non-pending entry in the DNS
  11083. cache when canceling a pending resolve. Don't log unless stuff
  11084. is fishy. Resolves bug 463.
  11085. - Don't reset trusted dir server list when we set a configuration
  11086. option. Patch from Robert Hogan.
  11087. Changes in version 0.1.2.17 - 2007-08-30
  11088. Tor 0.1.2.17 features a new Vidalia version in the Windows and OS
  11089. X bundles. Vidalia 0.0.14 makes authentication required for the
  11090. ControlPort in the default configuration, which addresses important
  11091. security risks. Everybody who uses Vidalia (or another controller)
  11092. should upgrade.
  11093. In addition, this Tor update fixes major load balancing problems with
  11094. path selection, which should speed things up a lot once many people
  11095. have upgraded.
  11096. o Major bugfixes (security):
  11097. - We removed support for the old (v0) control protocol. It has been
  11098. deprecated since Tor 0.1.1.1-alpha, and keeping it secure has
  11099. become more of a headache than it's worth.
  11100. o Major bugfixes (load balancing):
  11101. - When choosing nodes for non-guard positions, weight guards
  11102. proportionally less, since they already have enough load. Patch
  11103. from Mike Perry.
  11104. - Raise the "max believable bandwidth" from 1.5MB/s to 10MB/s. This
  11105. will allow fast Tor servers to get more attention.
  11106. - When we're upgrading from an old Tor version, forget our current
  11107. guards and pick new ones according to the new weightings. These
  11108. three load balancing patches could raise effective network capacity
  11109. by a factor of four. Thanks to Mike Perry for measurements.
  11110. o Major bugfixes (stream expiration):
  11111. - Expire not-yet-successful application streams in all cases if
  11112. they've been around longer than SocksTimeout. Right now there are
  11113. some cases where the stream will live forever, demanding a new
  11114. circuit every 15 seconds. Fixes bug 454; reported by lodger.
  11115. o Minor features (controller):
  11116. - Add a PROTOCOLINFO controller command. Like AUTHENTICATE, it
  11117. is valid before any authentication has been received. It tells
  11118. a controller what kind of authentication is expected, and what
  11119. protocol is spoken. Implements proposal 119.
  11120. o Minor bugfixes (performance):
  11121. - Save on most routerlist_assert_ok() calls in routerlist.c, thus
  11122. greatly speeding up loading cached-routers from disk on startup.
  11123. - Disable sentinel-based debugging for buffer code: we squashed all
  11124. the bugs that this was supposed to detect a long time ago, and now
  11125. its only effect is to change our buffer sizes from nice powers of
  11126. two (which platform mallocs tend to like) to values slightly over
  11127. powers of two (which make some platform mallocs sad).
  11128. o Minor bugfixes (misc):
  11129. - If exit bandwidth ever exceeds one third of total bandwidth, then
  11130. use the correct formula to weight exit nodes when choosing paths.
  11131. Based on patch from Mike Perry.
  11132. - Choose perfectly fairly among routers when choosing by bandwidth and
  11133. weighting by fraction of bandwidth provided by exits. Previously, we
  11134. would choose with only approximate fairness, and correct ourselves
  11135. if we ran off the end of the list.
  11136. - If we require CookieAuthentication but we fail to write the
  11137. cookie file, we would warn but not exit, and end up in a state
  11138. where no controller could authenticate. Now we exit.
  11139. - If we require CookieAuthentication, stop generating a new cookie
  11140. every time we change any piece of our config.
  11141. - Refuse to start with certain directory authority keys, and
  11142. encourage people using them to stop.
  11143. - Terminate multi-line control events properly. Original patch
  11144. from tup.
  11145. - Fix a minor memory leak when we fail to find enough suitable
  11146. servers to choose a circuit.
  11147. - Stop leaking part of the descriptor when we run into a particularly
  11148. unparseable piece of it.
  11149. Changes in version 0.1.2.16 - 2007-08-01
  11150. Tor 0.1.2.16 fixes a critical security vulnerability that allows a
  11151. remote attacker in certain situations to rewrite the user's torrc
  11152. configuration file. This can completely compromise anonymity of users
  11153. in most configurations, including those running the Vidalia bundles,
  11154. TorK, etc. Or worse.
  11155. o Major security fixes:
  11156. - Close immediately after missing authentication on control port;
  11157. do not allow multiple authentication attempts.
  11158. Changes in version 0.1.2.15 - 2007-07-17
  11159. Tor 0.1.2.15 fixes several crash bugs, fixes some anonymity-related
  11160. problems, fixes compilation on BSD, and fixes a variety of other
  11161. bugs. Everybody should upgrade.
  11162. o Major bugfixes (compilation):
  11163. - Fix compile on FreeBSD/NetBSD/OpenBSD. Oops.
  11164. o Major bugfixes (crashes):
  11165. - Try even harder not to dereference the first character after
  11166. an mmap(). Reported by lodger.
  11167. - Fix a crash bug in directory authorities when we re-number the
  11168. routerlist while inserting a new router.
  11169. - When the cached-routers file is an even multiple of the page size,
  11170. don't run off the end and crash. (Fixes bug 455; based on idea
  11171. from croup.)
  11172. - Fix eventdns.c behavior on Solaris: It is critical to include
  11173. orconfig.h _before_ sys/types.h, so that we can get the expected
  11174. definition of _FILE_OFFSET_BITS.
  11175. o Major bugfixes (security):
  11176. - Fix a possible buffer overrun when using BSD natd support. Bug
  11177. found by croup.
  11178. - When sending destroy cells from a circuit's origin, don't include
  11179. the reason for tearing down the circuit. The spec says we didn't,
  11180. and now we actually don't. Reported by lodger.
  11181. - Keep streamids from different exits on a circuit separate. This
  11182. bug may have allowed other routers on a given circuit to inject
  11183. cells into streams. Reported by lodger; fixes bug 446.
  11184. - If there's a never-before-connected-to guard node in our list,
  11185. never choose any guards past it. This way we don't expand our
  11186. guard list unless we need to.
  11187. o Minor bugfixes (guard nodes):
  11188. - Weight guard selection by bandwidth, so that low-bandwidth nodes
  11189. don't get overused as guards.
  11190. o Minor bugfixes (directory):
  11191. - Correctly count the number of authorities that recommend each
  11192. version. Previously, we were under-counting by 1.
  11193. - Fix a potential crash bug when we load many server descriptors at
  11194. once and some of them make others of them obsolete. Fixes bug 458.
  11195. o Minor bugfixes (hidden services):
  11196. - Stop tearing down the whole circuit when the user asks for a
  11197. connection to a port that the hidden service didn't configure.
  11198. Resolves bug 444.
  11199. o Minor bugfixes (misc):
  11200. - On Windows, we were preventing other processes from reading
  11201. cached-routers while Tor was running. Reported by janbar.
  11202. - Fix a possible (but very unlikely) bug in picking routers by
  11203. bandwidth. Add a log message to confirm that it is in fact
  11204. unlikely. Patch from lodger.
  11205. - Backport a couple of memory leak fixes.
  11206. - Backport miscellaneous cosmetic bugfixes.
  11207. Changes in version 0.1.2.14 - 2007-05-25
  11208. Tor 0.1.2.14 changes the addresses of two directory authorities (this
  11209. change especially affects those who serve or use hidden services),
  11210. and fixes several other crash- and security-related bugs.
  11211. o Directory authority changes:
  11212. - Two directory authorities (moria1 and moria2) just moved to new
  11213. IP addresses. This change will particularly affect those who serve
  11214. or use hidden services.
  11215. o Major bugfixes (crashes):
  11216. - If a directory server runs out of space in the connection table
  11217. as it's processing a begin_dir request, it will free the exit stream
  11218. but leave it attached to the circuit, leading to unpredictable
  11219. behavior. (Reported by seeess, fixes bug 425.)
  11220. - Fix a bug in dirserv_remove_invalid() that would cause authorities
  11221. to corrupt memory under some really unlikely scenarios.
  11222. - Tighten router parsing rules. (Bugs reported by Benedikt Boss.)
  11223. - Avoid segfaults when reading from mmaped descriptor file. (Reported
  11224. by lodger.)
  11225. o Major bugfixes (security):
  11226. - When choosing an entry guard for a circuit, avoid using guards
  11227. that are in the same family as the chosen exit -- not just guards
  11228. that are exactly the chosen exit. (Reported by lodger.)
  11229. o Major bugfixes (resource management):
  11230. - If a directory authority is down, skip it when deciding where to get
  11231. networkstatus objects or descriptors. Otherwise we keep asking
  11232. every 10 seconds forever. Fixes bug 384.
  11233. - Count it as a failure if we fetch a valid network-status but we
  11234. don't want to keep it. Otherwise we'll keep fetching it and keep
  11235. not wanting to keep it. Fixes part of bug 422.
  11236. - If all of our dirservers have given us bad or no networkstatuses
  11237. lately, then stop hammering them once per minute even when we
  11238. think they're failed. Fixes another part of bug 422.
  11239. o Minor bugfixes:
  11240. - Actually set the purpose correctly for descriptors inserted with
  11241. purpose=controller.
  11242. - When we have k non-v2 authorities in our DirServer config,
  11243. we ignored the last k authorities in the list when updating our
  11244. network-statuses.
  11245. - Correctly back-off from requesting router descriptors that we are
  11246. having a hard time downloading.
  11247. - Read resolv.conf files correctly on platforms where read() returns
  11248. partial results on small file reads.
  11249. - Don't rebuild the entire router store every time we get 32K of
  11250. routers: rebuild it when the journal gets very large, or when
  11251. the gaps in the store get very large.
  11252. o Minor features:
  11253. - When routers publish SVN revisions in their router descriptors,
  11254. authorities now include those versions correctly in networkstatus
  11255. documents.
  11256. - Warn when using a version of libevent before 1.3b to run a server on
  11257. OSX or BSD: these versions interact badly with userspace threads.
  11258. Changes in version 0.1.2.13 - 2007-04-24
  11259. This release features some major anonymity fixes, such as safer path
  11260. selection; better client performance; faster bootstrapping, better
  11261. address detection, and better DNS support for servers; write limiting as
  11262. well as read limiting to make servers easier to run; and a huge pile of
  11263. other features and bug fixes. The bundles also ship with Vidalia 0.0.11.
  11264. Tor 0.1.2.13 is released in memory of Rob Levin (1955-2006), aka lilo
  11265. of the Freenode IRC network, remembering his patience and vision for
  11266. free speech on the Internet.
  11267. o Major features, client performance:
  11268. - Weight directory requests by advertised bandwidth. Now we can
  11269. let servers enable write limiting but still allow most clients to
  11270. succeed at their directory requests. (We still ignore weights when
  11271. choosing a directory authority; I hope this is a feature.)
  11272. - Stop overloading exit nodes -- avoid choosing them for entry or
  11273. middle hops when the total bandwidth available from non-exit nodes
  11274. is much higher than the total bandwidth available from exit nodes.
  11275. - Rather than waiting a fixed amount of time between retrying
  11276. application connections, we wait only 10 seconds for the first,
  11277. 10 seconds for the second, and 15 seconds for each retry after
  11278. that. Hopefully this will improve the expected user experience.
  11279. - Sometimes we didn't bother sending a RELAY_END cell when an attempt
  11280. to open a stream fails; now we do in more cases. This should
  11281. make clients able to find a good exit faster in some cases, since
  11282. unhandleable requests will now get an error rather than timing out.
  11283. o Major features, client functionality:
  11284. - Implement BEGIN_DIR cells, so we can connect to a directory
  11285. server via TLS to do encrypted directory requests rather than
  11286. plaintext. Enable via the TunnelDirConns and PreferTunneledDirConns
  11287. config options if you like. For now, this feature only works if
  11288. you already have a descriptor for the destination dirserver.
  11289. - Add support for transparent application connections: this basically
  11290. bundles the functionality of trans-proxy-tor into the Tor
  11291. mainline. Now hosts with compliant pf/netfilter implementations
  11292. can redirect TCP connections straight to Tor without diverting
  11293. through SOCKS. (Based on patch from tup.)
  11294. - Add support for using natd; this allows FreeBSDs earlier than
  11295. 5.1.2 to have ipfw send connections through Tor without using
  11296. SOCKS. (Patch from Zajcev Evgeny with tweaks from tup.)
  11297. o Major features, servers:
  11298. - Setting up a dyndns name for your server is now optional: servers
  11299. with no hostname or IP address will learn their IP address by
  11300. asking the directory authorities. This code only kicks in when you
  11301. would normally have exited with a "no address" error. Nothing's
  11302. authenticated, so use with care.
  11303. - Directory servers now spool server descriptors, v1 directories,
  11304. and v2 networkstatus objects to buffers as needed rather than en
  11305. masse. They also mmap the cached-routers files. These steps save
  11306. lots of memory.
  11307. - Stop requiring clients to have well-formed certificates, and stop
  11308. checking nicknames in certificates. (Clients have certificates so
  11309. that they can look like Tor servers, but in the future we might want
  11310. to allow them to look like regular TLS clients instead. Nicknames
  11311. in certificates serve no purpose other than making our protocol
  11312. easier to recognize on the wire.) Implements proposal 106.
  11313. o Improvements on DNS support:
  11314. - Add "eventdns" asynchronous dns library originally based on code
  11315. from Adam Langley. Now we can discard the old rickety dnsworker
  11316. concept, and support a wider variety of DNS functions. Allows
  11317. multithreaded builds on NetBSD and OpenBSD again.
  11318. - Add server-side support for "reverse" DNS lookups (using PTR
  11319. records so clients can determine the canonical hostname for a given
  11320. IPv4 address). Only supported by servers using eventdns; servers
  11321. now announce in their descriptors if they don't support eventdns.
  11322. - Workaround for name servers (like Earthlink's) that hijack failing
  11323. DNS requests and replace the no-such-server answer with a "helpful"
  11324. redirect to an advertising-driven search portal. Also work around
  11325. DNS hijackers who "helpfully" decline to hijack known-invalid
  11326. RFC2606 addresses. Config option "ServerDNSDetectHijacking 0"
  11327. lets you turn it off.
  11328. - Servers now check for the case when common DNS requests are going to
  11329. wildcarded addresses (i.e. all getting the same answer), and change
  11330. their exit policy to reject *:* if it's happening.
  11331. - When asked to resolve a hostname, don't use non-exit servers unless
  11332. requested to do so. This allows servers with broken DNS to be
  11333. useful to the network.
  11334. - Start passing "ipv4" hints to getaddrinfo(), so servers don't do
  11335. useless IPv6 DNS resolves.
  11336. - Specify and implement client-side SOCKS5 interface for reverse DNS
  11337. lookups (see doc/socks-extensions.txt). Also cache them.
  11338. - When we change nameservers or IP addresses, reset and re-launch
  11339. our tests for DNS hijacking.
  11340. o Improvements on reachability testing:
  11341. - Servers send out a burst of long-range padding cells once they've
  11342. established that they're reachable. Spread them over 4 circuits,
  11343. so hopefully a few will be fast. This exercises bandwidth and
  11344. bootstraps them into the directory more quickly.
  11345. - When we find our DirPort to be reachable, publish a new descriptor
  11346. so we'll tell the world (reported by pnx).
  11347. - Directory authorities now only decide that routers are reachable
  11348. if their identity keys are as expected.
  11349. - Do DirPort reachability tests less often, since a single test
  11350. chews through many circuits before giving up.
  11351. - Avoid some false positives during reachability testing: don't try
  11352. to test via a server that's on the same /24 network as us.
  11353. - Start publishing one minute or so after we find our ORPort
  11354. to be reachable. This will help reduce the number of descriptors
  11355. we have for ourselves floating around, since it's quite likely
  11356. other things (e.g. DirPort) will change during that minute too.
  11357. - Routers no longer try to rebuild long-term connections to directory
  11358. authorities, and directory authorities no longer try to rebuild
  11359. long-term connections to all servers. We still don't hang up
  11360. connections in these two cases though -- we need to look at it
  11361. more carefully to avoid flapping, and we likely need to wait til
  11362. 0.1.1.x is obsolete.
  11363. o Improvements on rate limiting:
  11364. - Enable write limiting as well as read limiting. Now we sacrifice
  11365. capacity if we're pushing out lots of directory traffic, rather
  11366. than overrunning the user's intended bandwidth limits.
  11367. - Include TLS overhead when counting bandwidth usage; previously, we
  11368. would count only the bytes sent over TLS, but not the bytes used
  11369. to send them.
  11370. - Servers decline directory requests much more aggressively when
  11371. they're low on bandwidth. Otherwise they end up queueing more and
  11372. more directory responses, which can't be good for latency.
  11373. - But never refuse directory requests from local addresses.
  11374. - Be willing to read or write on local connections (e.g. controller
  11375. connections) even when the global rate limiting buckets are empty.
  11376. - Flush local controller connection buffers periodically as we're
  11377. writing to them, so we avoid queueing 4+ megabytes of data before
  11378. trying to flush.
  11379. - Revise and clean up the torrc.sample that we ship with; add
  11380. a section for BandwidthRate and BandwidthBurst.
  11381. o Major features, NT services:
  11382. - Install as NT_AUTHORITY\LocalService rather than as SYSTEM; add a
  11383. command-line flag so that admins can override the default by saying
  11384. "tor --service install --user "SomeUser"". This will not affect
  11385. existing installed services. Also, warn the user that the service
  11386. will look for its configuration file in the service user's
  11387. %appdata% directory. (We can't do the "hardwire the user's appdata
  11388. directory" trick any more, since we may not have read access to that
  11389. directory.)
  11390. - Support running the Tor service with a torrc not in the same
  11391. directory as tor.exe and default to using the torrc located in
  11392. the %appdata%\Tor\ of the user who installed the service. Patch
  11393. from Matt Edman.
  11394. - Add an --ignore-missing-torrc command-line option so that we can
  11395. get the "use sensible defaults if the configuration file doesn't
  11396. exist" behavior even when specifying a torrc location on the
  11397. command line.
  11398. - When stopping an NT service, wait up to 10 sec for it to actually
  11399. stop. (Patch from Matt Edman; resolves bug 295.)
  11400. o Directory authority improvements:
  11401. - Stop letting hibernating or obsolete servers affect uptime and
  11402. bandwidth cutoffs.
  11403. - Stop listing hibernating servers in the v1 directory.
  11404. - Authorities no longer recommend exits as guards if this would shift
  11405. too much load to the exit nodes.
  11406. - Authorities now specify server versions in networkstatus. This adds
  11407. about 2% to the size of compressed networkstatus docs, and allows
  11408. clients to tell which servers support BEGIN_DIR and which don't.
  11409. The implementation is forward-compatible with a proposed future
  11410. protocol version scheme not tied to Tor versions.
  11411. - DirServer configuration lines now have an orport= option so
  11412. clients can open encrypted tunnels to the authorities without
  11413. having downloaded their descriptors yet. Enabled for moria1,
  11414. moria2, tor26, and lefkada now in the default configuration.
  11415. - Add a BadDirectory flag to network status docs so that authorities
  11416. can (eventually) tell clients about caches they believe to be
  11417. broken. Not used yet.
  11418. - Allow authorities to list nodes as bad exits in their
  11419. approved-routers file by fingerprint or by address. If most
  11420. authorities set a BadExit flag for a server, clients don't think
  11421. of it as a general-purpose exit. Clients only consider authorities
  11422. that advertise themselves as listing bad exits.
  11423. - Patch from Steve Hildrey: Generate network status correctly on
  11424. non-versioning dirservers.
  11425. - Have directory authorities allow larger amounts of drift in uptime
  11426. without replacing the server descriptor: previously, a server that
  11427. restarted every 30 minutes could have 48 "interesting" descriptors
  11428. per day.
  11429. - Reserve the nickname "Unnamed" for routers that can't pick
  11430. a hostname: any router can call itself Unnamed; directory
  11431. authorities will never allocate Unnamed to any particular router;
  11432. clients won't believe that any router is the canonical Unnamed.
  11433. o Directory mirrors and clients:
  11434. - Discard any v1 directory info that's over 1 month old (for
  11435. directories) or over 1 week old (for running-routers lists).
  11436. - Clients track responses with status 503 from dirservers. After a
  11437. dirserver has given us a 503, we try not to use it until an hour has
  11438. gone by, or until we have no dirservers that haven't given us a 503.
  11439. - When we get a 503 from a directory, and we're not a server, we no
  11440. longer count the failure against the total number of failures
  11441. allowed for the object we're trying to download.
  11442. - Prepare for servers to publish descriptors less often: never
  11443. discard a descriptor simply for being too old until either it is
  11444. recommended by no authorities, or until we get a better one for
  11445. the same router. Make caches consider retaining old recommended
  11446. routers for even longer.
  11447. - Directory servers now provide 'Pragma: no-cache' and 'Expires'
  11448. headers for content, so that we can work better in the presence of
  11449. caching HTTP proxies.
  11450. - Stop fetching descriptors if you're not a dir mirror and you
  11451. haven't tried to establish any circuits lately. (This currently
  11452. causes some dangerous behavior, because when you start up again
  11453. you'll use your ancient server descriptors.)
  11454. o Major fixes, crashes:
  11455. - Stop crashing when the controller asks us to resetconf more than
  11456. one config option at once. (Vidalia 0.0.11 does this.)
  11457. - Fix a longstanding obscure crash bug that could occur when we run
  11458. out of DNS worker processes, if we're not using eventdns. (Resolves
  11459. bug 390.)
  11460. - Fix an assert that could trigger if a controller quickly set then
  11461. cleared EntryNodes. (Bug found by Udo van den Heuvel.)
  11462. - Avoid crash when telling controller about stream-status and a
  11463. stream is detached.
  11464. - Avoid sending junk to controllers or segfaulting when a controller
  11465. uses EVENT_NEW_DESC with verbose nicknames.
  11466. - Stop triggering asserts if the controller tries to extend hidden
  11467. service circuits (reported by mwenge).
  11468. - If we start a server with ClientOnly 1, then set ClientOnly to 0
  11469. and hup, stop triggering an assert based on an empty onion_key.
  11470. - Mask out all signals in sub-threads; only the libevent signal
  11471. handler should be processing them. This should prevent some crashes
  11472. on some machines using pthreads. (Patch from coderman.)
  11473. - Disable kqueue on OS X 10.3 and earlier, to fix bug 371.
  11474. o Major fixes, anonymity/security:
  11475. - Automatically avoid picking more than one node from the same
  11476. /16 network when constructing a circuit. Add an
  11477. "EnforceDistinctSubnets" option to let people disable it if they
  11478. want to operate private test networks on a single subnet.
  11479. - When generating bandwidth history, round down to the nearest
  11480. 1k. When storing accounting data, round up to the nearest 1k.
  11481. - When we're running as a server, remember when we last rotated onion
  11482. keys, so that we will rotate keys once they're a week old even if
  11483. we never stay up for a week ourselves.
  11484. - If a client asked for a server by name, and there's a named server
  11485. in our network-status but we don't have its descriptor yet, we
  11486. could return an unnamed server instead.
  11487. - Reject (most) attempts to use Tor circuits with length one. (If
  11488. many people start using Tor as a one-hop proxy, exit nodes become
  11489. a more attractive target for compromise.)
  11490. - Just because your DirPort is open doesn't mean people should be
  11491. able to remotely teach you about hidden service descriptors. Now
  11492. only accept rendezvous posts if you've got HSAuthoritativeDir set.
  11493. - Fix a potential race condition in the rpm installer. Found by
  11494. Stefan Nordhausen.
  11495. - Do not log IPs with TLS failures for incoming TLS
  11496. connections. (Fixes bug 382.)
  11497. o Major fixes, other:
  11498. - If our system clock jumps back in time, don't publish a negative
  11499. uptime in the descriptor.
  11500. - When we start during an accounting interval before it's time to wake
  11501. up, remember to wake up at the correct time. (May fix bug 342.)
  11502. - Previously, we would cache up to 16 old networkstatus documents
  11503. indefinitely, if they came from nontrusted authorities. Now we
  11504. discard them if they are more than 10 days old.
  11505. - When we have a state file we cannot parse, tell the user and
  11506. move it aside. Now we avoid situations where the user starts
  11507. Tor in 1904, Tor writes a state file with that timestamp in it,
  11508. the user fixes her clock, and Tor refuses to start.
  11509. - Publish a new descriptor after we hup/reload. This is important
  11510. if our config has changed such that we'll want to start advertising
  11511. our DirPort now, etc.
  11512. - If we are using an exit enclave and we can't connect, e.g. because
  11513. its webserver is misconfigured to not listen on localhost, then
  11514. back off and try connecting from somewhere else before we fail.
  11515. o New config options or behaviors:
  11516. - When EntryNodes are configured, rebuild the guard list to contain,
  11517. in order: the EntryNodes that were guards before; the rest of the
  11518. EntryNodes; the nodes that were guards before.
  11519. - Do not warn when individual nodes in the configuration's EntryNodes,
  11520. ExitNodes, etc are down: warn only when all possible nodes
  11521. are down. (Fixes bug 348.)
  11522. - Put a lower-bound on MaxAdvertisedBandwidth.
  11523. - Start using the state file to store bandwidth accounting data:
  11524. the bw_accounting file is now obsolete. We'll keep generating it
  11525. for a while for people who are still using 0.1.2.4-alpha.
  11526. - Try to batch changes to the state file so that we do as few
  11527. disk writes as possible while still storing important things in
  11528. a timely fashion.
  11529. - The state file and the bw_accounting file get saved less often when
  11530. the AvoidDiskWrites config option is set.
  11531. - Make PIDFile work on Windows.
  11532. - Add internal descriptions for a bunch of configuration options:
  11533. accessible via controller interface and in comments in saved
  11534. options files.
  11535. - Reject *:563 (NNTPS) in the default exit policy. We already reject
  11536. NNTP by default, so this seems like a sensible addition.
  11537. - Clients now reject hostnames with invalid characters. This should
  11538. avoid some inadvertent info leaks. Add an option
  11539. AllowNonRFC953Hostnames to disable this behavior, in case somebody
  11540. is running a private network with hosts called @, !, and #.
  11541. - Check for addresses with invalid characters at the exit as well,
  11542. and warn less verbosely when they fail. You can override this by
  11543. setting ServerDNSAllowNonRFC953Addresses to 1.
  11544. - Remove some options that have been deprecated since at least
  11545. 0.1.0.x: AccountingMaxKB, LogFile, DebugLogFile, LogLevel, and
  11546. SysLog. Use AccountingMax instead of AccountingMaxKB, and use Log
  11547. to set log options. Mark PathlenCoinWeight as obsolete.
  11548. - Stop accepting certain malformed ports in configured exit policies.
  11549. - When the user uses bad syntax in the Log config line, stop
  11550. suggesting other bad syntax as a replacement.
  11551. - Add new config option "ResolvConf" to let the server operator
  11552. choose an alternate resolve.conf file when using eventdns.
  11553. - If one of our entry guards is on the ExcludeNodes list, or the
  11554. directory authorities don't think it's a good guard, treat it as
  11555. if it were unlisted: stop using it as a guard, and throw it off
  11556. the guards list if it stays that way for a long time.
  11557. - Allow directory authorities to be marked separately as authorities
  11558. for the v1 directory protocol, the v2 directory protocol, and
  11559. as hidden service directories, to make it easier to retire old
  11560. authorities. V1 authorities should set "HSAuthoritativeDir 1"
  11561. to continue being hidden service authorities too.
  11562. - Remove 8888 as a LongLivedPort, and add 6697 (IRCS).
  11563. - Make TrackExitHosts case-insensitive, and fix the behavior of
  11564. ".suffix" TrackExitHosts items to avoid matching in the middle of
  11565. an address.
  11566. - New DirPort behavior: if you have your dirport set, you download
  11567. descriptors aggressively like a directory mirror, whether or not
  11568. your ORPort is set.
  11569. o Docs:
  11570. - Create a new file ReleaseNotes which was the old ChangeLog. The
  11571. new ChangeLog file now includes the notes for all development
  11572. versions too.
  11573. - Add a new address-spec.txt document to describe our special-case
  11574. addresses: .exit, .onion, and .noconnnect.
  11575. - Fork the v1 directory protocol into its own spec document,
  11576. and mark dir-spec.txt as the currently correct (v2) spec.
  11577. o Packaging, porting, and contrib
  11578. - "tor --verify-config" now exits with -1(255) or 0 depending on
  11579. whether the config options are bad or good.
  11580. - The Debian package now uses --verify-config when (re)starting,
  11581. to distinguish configuration errors from other errors.
  11582. - Adapt a patch from goodell to let the contrib/exitlist script
  11583. take arguments rather than require direct editing.
  11584. - Prevent the contrib/exitlist script from printing the same
  11585. result more than once.
  11586. - Add support to tor-resolve tool for reverse lookups and SOCKS5.
  11587. - In the hidden service example in torrc.sample, stop recommending
  11588. esoteric and discouraged hidden service options.
  11589. - Patch from Michael Mohr to contrib/cross.sh, so it checks more
  11590. values before failing, and always enables eventdns.
  11591. - Try to detect Windows correctly when cross-compiling.
  11592. - Libevent-1.2 exports, but does not define in its headers, strlcpy.
  11593. Try to fix this in configure.in by checking for most functions
  11594. before we check for libevent.
  11595. - Update RPMs to require libevent 1.2.
  11596. - Experimentally re-enable kqueue on OSX when using libevent 1.1b
  11597. or later. Log when we are doing this, so we can diagnose it when
  11598. it fails. (Also, recommend libevent 1.1b for kqueue and
  11599. win32 methods; deprecate libevent 1.0b harder; make libevent
  11600. recommendation system saner.)
  11601. - Build with recent (1.3+) libevents on platforms that do not
  11602. define the nonstandard types "u_int8_t" and friends.
  11603. - Remove architecture from OS X builds. The official builds are
  11604. now universal binaries.
  11605. - Run correctly on OS X platforms with case-sensitive filesystems.
  11606. - Correctly set maximum connection limit on Cygwin. (This time
  11607. for sure!)
  11608. - Start compiling on MinGW on Windows (patches from Mike Chiussi
  11609. and many others).
  11610. - Start compiling on MSVC6 on Windows (patches from Frediano Ziglio).
  11611. - Finally fix the openssl warnings from newer gccs that believe that
  11612. ignoring a return value is okay, but casting a return value and
  11613. then ignoring it is a sign of madness.
  11614. - On architectures where sizeof(int)>4, still clamp declarable
  11615. bandwidth to INT32_MAX.
  11616. o Minor features, controller:
  11617. - Warn the user when an application uses the obsolete binary v0
  11618. control protocol. We're planning to remove support for it during
  11619. the next development series, so it's good to give people some
  11620. advance warning.
  11621. - Add STREAM_BW events to report per-entry-stream bandwidth
  11622. use. (Patch from Robert Hogan.)
  11623. - Rate-limit SIGNEWNYM signals in response to controllers that
  11624. impolitely generate them for every single stream. (Patch from
  11625. mwenge; closes bug 394.)
  11626. - Add a REMAP status to stream events to note that a stream's
  11627. address has changed because of a cached address or a MapAddress
  11628. directive.
  11629. - Make REMAP stream events have a SOURCE (cache or exit), and
  11630. make them generated in every case where we get a successful
  11631. connected or resolved cell.
  11632. - Track reasons for OR connection failure; make these reasons
  11633. available via the controller interface. (Patch from Mike Perry.)
  11634. - Add a SOCKS_BAD_HOSTNAME client status event so controllers
  11635. can learn when clients are sending malformed hostnames to Tor.
  11636. - Specify and implement some of the controller status events.
  11637. - Have GETINFO dir/status/* work on hosts with DirPort disabled.
  11638. - Reimplement GETINFO so that info/names stays in sync with the
  11639. actual keys.
  11640. - Implement "GETINFO fingerprint".
  11641. - Implement "SETEVENTS GUARD" so controllers can get updates on
  11642. entry guard status as it changes.
  11643. - Make all connections to addresses of the form ".noconnect"
  11644. immediately get closed. This lets application/controller combos
  11645. successfully test whether they're talking to the same Tor by
  11646. watching for STREAM events.
  11647. - Add a REASON field to CIRC events; for backward compatibility, this
  11648. field is sent only to controllers that have enabled the extended
  11649. event format. Also, add additional reason codes to explain why
  11650. a given circuit has been destroyed or truncated. (Patches from
  11651. Mike Perry)
  11652. - Add a REMOTE_REASON field to extended CIRC events to tell the
  11653. controller why a remote OR told us to close a circuit.
  11654. - Stream events also now have REASON and REMOTE_REASON fields,
  11655. working much like those for circuit events.
  11656. - There's now a GETINFO ns/... field so that controllers can ask Tor
  11657. about the current status of a router.
  11658. - A new event type "NS" to inform a controller when our opinion of
  11659. a router's status has changed.
  11660. - Add a GETINFO events/names and GETINFO features/names so controllers
  11661. can tell which events and features are supported.
  11662. - A new CLEARDNSCACHE signal to allow controllers to clear the
  11663. client-side DNS cache without expiring circuits.
  11664. - Fix CIRC controller events so that controllers can learn the
  11665. identity digests of non-Named servers used in circuit paths.
  11666. - Let controllers ask for more useful identifiers for servers. Instead
  11667. of learning identity digests for un-Named servers and nicknames
  11668. for Named servers, the new identifiers include digest, nickname,
  11669. and indication of Named status. Off by default; see control-spec.txt
  11670. for more information.
  11671. - Add a "getinfo address" controller command so it can display Tor's
  11672. best guess to the user.
  11673. - New controller event to alert the controller when our server
  11674. descriptor has changed.
  11675. - Give more meaningful errors on controller authentication failure.
  11676. - Export the default exit policy via the control port, so controllers
  11677. don't need to guess what it is / will be later.
  11678. o Minor bugfixes, controller:
  11679. - When creating a circuit via the controller, send a 'launched'
  11680. event when we're done, so we follow the spec better.
  11681. - Correct the control spec to match how the code actually responds
  11682. to 'getinfo addr-mappings/*'. Reported by daejees.
  11683. - The control spec described a GUARDS event, but the code
  11684. implemented a GUARD event. Standardize on GUARD, but let people
  11685. ask for GUARDS too. Reported by daejees.
  11686. - Give the controller END_STREAM_REASON_DESTROY events _before_ we
  11687. clear the corresponding on_circuit variable, and remember later
  11688. that we don't need to send a redundant CLOSED event. (Resolves part
  11689. 3 of bug 367.)
  11690. - Report events where a resolve succeeded or where we got a socks
  11691. protocol error correctly, rather than calling both of them
  11692. "INTERNAL".
  11693. - Change reported stream target addresses to IP consistently when
  11694. we finally get the IP from an exit node.
  11695. - Send log messages to the controller even if they happen to be very
  11696. long.
  11697. - Flush ERR-level controller status events just like we currently
  11698. flush ERR-level log events, so that a Tor shutdown doesn't prevent
  11699. the controller from learning about current events.
  11700. - Report the circuit number correctly in STREAM CLOSED events. Bug
  11701. reported by Mike Perry.
  11702. - Do not report bizarre values for results of accounting GETINFOs
  11703. when the last second's write or read exceeds the allotted bandwidth.
  11704. - Report "unrecognized key" rather than an empty string when the
  11705. controller tries to fetch a networkstatus that doesn't exist.
  11706. - When the controller does a "GETINFO network-status", tell it
  11707. about even those routers whose descriptors are very old, and use
  11708. long nicknames where appropriate.
  11709. - Fix handling of verbose nicknames with ORCONN controller events:
  11710. make them show up exactly when requested, rather than exactly when
  11711. not requested.
  11712. - Controller signals now work on non-Unix platforms that don't define
  11713. SIGUSR1 and SIGUSR2 the way we expect.
  11714. - Respond to SIGNAL command before we execute the signal, in case
  11715. the signal shuts us down. Suggested by Karsten Loesing.
  11716. - Handle reporting OR_CONN_EVENT_NEW events to the controller.
  11717. o Minor features, code performance:
  11718. - Major performance improvement on inserting descriptors: change
  11719. algorithm from O(n^2) to O(n).
  11720. - Do not rotate onion key immediately after setting it for the first
  11721. time.
  11722. - Call router_have_min_dir_info half as often. (This is showing up in
  11723. some profiles, but not others.)
  11724. - When using GCC, make log_debug never get called at all, and its
  11725. arguments never get evaluated, when no debug logs are configured.
  11726. (This is showing up in some profiles, but not others.)
  11727. - Statistics dumped by -USR2 now include a breakdown of public key
  11728. operations, for profiling.
  11729. - Make the common memory allocation path faster on machines where
  11730. malloc(0) returns a pointer.
  11731. - Split circuit_t into origin_circuit_t and or_circuit_t, and
  11732. split connection_t into edge, or, dir, control, and base structs.
  11733. These will save quite a bit of memory on busy servers, and they'll
  11734. also help us track down bugs in the code and bugs in the spec.
  11735. - Use OpenSSL's AES implementation on platforms where it's faster.
  11736. This could save us as much as 10% CPU usage.
  11737. o Minor features, descriptors and descriptor handling:
  11738. - Avoid duplicate entries on MyFamily line in server descriptor.
  11739. - When Tor receives a router descriptor that it asked for, but
  11740. no longer wants (because it has received fresh networkstatuses
  11741. in the meantime), do not warn the user. Cache the descriptor if
  11742. we're a cache; drop it if we aren't.
  11743. - Servers no longer ever list themselves in their "family" line,
  11744. even if configured to do so. This makes it easier to configure
  11745. family lists conveniently.
  11746. o Minor fixes, confusing/misleading log messages:
  11747. - Display correct results when reporting which versions are
  11748. recommended, and how recommended they are. (Resolves bug 383.)
  11749. - Inform the server operator when we decide not to advertise a
  11750. DirPort due to AccountingMax enabled or a low BandwidthRate.
  11751. - Only include function names in log messages for info/debug messages.
  11752. For notice/warn/err, the content of the message should be clear on
  11753. its own, and printing the function name only confuses users.
  11754. - Remove even more protocol-related warnings from Tor server logs,
  11755. such as bad TLS handshakes and malformed begin cells.
  11756. - Fix bug 314: Tor clients issued "unsafe socks" warnings even
  11757. when the IP address is mapped through MapAddress to a hostname.
  11758. - Fix misleading log messages: an entry guard that is "unlisted",
  11759. as well as not known to be "down" (because we've never heard
  11760. of it), is not therefore "up".
  11761. o Minor fixes, old/obsolete behavior:
  11762. - Start assuming we can use a create_fast cell if we don't know
  11763. what version a router is running.
  11764. - We no longer look for identity and onion keys in "identity.key" and
  11765. "onion.key" -- these were replaced by secret_id_key and
  11766. secret_onion_key in 0.0.8pre1.
  11767. - We no longer require unrecognized directory entries to be
  11768. preceded by "opt".
  11769. - Drop compatibility with obsolete Tors that permit create cells
  11770. to have the wrong circ_id_type.
  11771. - Remove code to special-case "-cvs" ending, since it has not
  11772. actually mattered since 0.0.9.
  11773. - Don't re-write the fingerprint file every restart, unless it has
  11774. changed.
  11775. o Minor fixes, misc client-side behavior:
  11776. - Always remove expired routers and networkstatus docs before checking
  11777. whether we have enough information to build circuits. (Fixes
  11778. bug 373.)
  11779. - When computing clock skew from directory HTTP headers, consider what
  11780. time it was when we finished asking for the directory, not what
  11781. time it is now.
  11782. - Make our socks5 handling more robust to broken socks clients:
  11783. throw out everything waiting on the buffer in between socks
  11784. handshake phases, since they can't possibly (so the theory
  11785. goes) have predicted what we plan to respond to them.
  11786. - Expire socks connections if they spend too long waiting for the
  11787. handshake to finish. Previously we would let them sit around for
  11788. days, if the connecting application didn't close them either.
  11789. - And if the socks handshake hasn't started, don't send a
  11790. "DNS resolve socks failed" handshake reply; just close it.
  11791. - If the user asks to use invalid exit nodes, be willing to use
  11792. unstable ones.
  11793. - Track unreachable entry guards correctly: don't conflate
  11794. 'unreachable by us right now' with 'listed as down by the directory
  11795. authorities'. With the old code, if a guard was unreachable by us
  11796. but listed as running, it would clog our guard list forever.
  11797. - Behave correctly in case we ever have a network with more than
  11798. 2GB/s total advertised capacity.
  11799. - Claim a commonname of Tor, rather than TOR, in TLS handshakes.
  11800. - Fix a memory leak when we ask for "all" networkstatuses and we
  11801. get one we don't recognize.
  11802. Changes in version 0.1.1.26 - 2006-12-14
  11803. o Security bugfixes:
  11804. - Stop sending the HttpProxyAuthenticator string to directory
  11805. servers when directory connections are tunnelled through Tor.
  11806. - Clients no longer store bandwidth history in the state file.
  11807. - Do not log introduction points for hidden services if SafeLogging
  11808. is set.
  11809. o Minor bugfixes:
  11810. - Fix an assert failure when a directory authority sets
  11811. AuthDirRejectUnlisted and then receives a descriptor from an
  11812. unlisted router (reported by seeess).
  11813. Changes in version 0.1.1.25 - 2006-11-04
  11814. o Major bugfixes:
  11815. - When a client asks us to resolve (rather than connect to)
  11816. an address, and we have a cached answer, give them the cached
  11817. answer. Previously, we would give them no answer at all.
  11818. - We were building exactly the wrong circuits when we predict
  11819. hidden service requirements, meaning Tor would have to build all
  11820. its circuits on demand.
  11821. - If none of our live entry guards have a high uptime, but we
  11822. require a guard with a high uptime, try adding a new guard before
  11823. we give up on the requirement. This patch should make long-lived
  11824. connections more stable on average.
  11825. - When testing reachability of our DirPort, don't launch new
  11826. tests when there's already one in progress -- unreachable
  11827. servers were stacking up dozens of testing streams.
  11828. o Security bugfixes:
  11829. - When the user sends a NEWNYM signal, clear the client-side DNS
  11830. cache too. Otherwise we continue to act on previous information.
  11831. o Minor bugfixes:
  11832. - Avoid a memory corruption bug when creating a hash table for
  11833. the first time.
  11834. - Avoid possibility of controller-triggered crash when misusing
  11835. certain commands from a v0 controller on platforms that do not
  11836. handle printf("%s",NULL) gracefully.
  11837. - Avoid infinite loop on unexpected controller input.
  11838. - Don't log spurious warnings when we see a circuit close reason we
  11839. don't recognize; it's probably just from a newer version of Tor.
  11840. - Add Vidalia to the OS X uninstaller script, so when we uninstall
  11841. Tor/Privoxy we also uninstall Vidalia.
  11842. Changes in version 0.1.1.24 - 2006-09-29
  11843. o Major bugfixes:
  11844. - Allow really slow clients to not hang up five minutes into their
  11845. directory downloads (suggested by Adam J. Richter).
  11846. - Fix major performance regression from 0.1.0.x: instead of checking
  11847. whether we have enough directory information every time we want to
  11848. do something, only check when the directory information has changed.
  11849. This should improve client CPU usage by 25-50%.
  11850. - Don't crash if, after a server has been running for a while,
  11851. it can't resolve its hostname.
  11852. - When a client asks us to resolve (not connect to) an address,
  11853. and we have a cached answer, give them the cached answer.
  11854. Previously, we would give them no answer at all.
  11855. o Minor bugfixes:
  11856. - Allow Tor to start when RunAsDaemon is set but no logs are set.
  11857. - Don't crash when the controller receives a third argument to an
  11858. "extendcircuit" request.
  11859. - Controller protocol fixes: fix encoding in "getinfo addr-mappings"
  11860. response; fix error code when "getinfo dir/status/" fails.
  11861. - Fix configure.in to not produce broken configure files with
  11862. more recent versions of autoconf. Thanks to Clint for his auto*
  11863. voodoo.
  11864. - Fix security bug on NetBSD that could allow someone to force
  11865. uninitialized RAM to be sent to a server's DNS resolver. This
  11866. only affects NetBSD and other platforms that do not bounds-check
  11867. tolower().
  11868. - Warn user when using libevent 1.1a or earlier with win32 or kqueue
  11869. methods: these are known to be buggy.
  11870. - If we're a directory mirror and we ask for "all" network status
  11871. documents, we would discard status documents from authorities
  11872. we don't recognize.
  11873. Changes in version 0.1.1.23 - 2006-07-30
  11874. o Major bugfixes:
  11875. - Fast Tor servers, especially exit nodes, were triggering asserts
  11876. due to a bug in handling the list of pending DNS resolves. Some
  11877. bugs still remain here; we're hunting them.
  11878. - Entry guards could crash clients by sending unexpected input.
  11879. - More fixes on reachability testing: if you find yourself reachable,
  11880. then don't ever make any client requests (so you stop predicting
  11881. circuits), then hup or have your clock jump, then later your IP
  11882. changes, you won't think circuits are working, so you won't try to
  11883. test reachability, so you won't publish.
  11884. o Minor bugfixes:
  11885. - Avoid a crash if the controller does a resetconf firewallports
  11886. and then a setconf fascistfirewall=1.
  11887. - Avoid an integer underflow when the dir authority decides whether
  11888. a router is stable: we might wrongly label it stable, and compute
  11889. a slightly wrong median stability, when a descriptor is published
  11890. later than now.
  11891. - Fix a place where we might trigger an assert if we can't build our
  11892. own server descriptor yet.
  11893. Changes in version 0.1.1.22 - 2006-07-05
  11894. o Major bugfixes:
  11895. - Fix a big bug that was causing servers to not find themselves
  11896. reachable if they changed IP addresses. Since only 0.1.1.22+
  11897. servers can do reachability testing correctly, now we automatically
  11898. make sure to test via one of these.
  11899. - Fix to allow clients and mirrors to learn directory info from
  11900. descriptor downloads that get cut off partway through.
  11901. - Directory authorities had a bug in deciding if a newly published
  11902. descriptor was novel enough to make everybody want a copy -- a few
  11903. servers seem to be publishing new descriptors many times a minute.
  11904. o Minor bugfixes:
  11905. - Fix a rare bug that was causing some servers to complain about
  11906. "closing wedged cpuworkers" and skip some circuit create requests.
  11907. - Make the Exit flag in directory status documents actually work.
  11908. Changes in version 0.1.1.21 - 2006-06-10
  11909. o Crash and assert fixes from 0.1.1.20:
  11910. - Fix a rare crash on Tor servers that have enabled hibernation.
  11911. - Fix a seg fault on startup for Tor networks that use only one
  11912. directory authority.
  11913. - Fix an assert from a race condition that occurs on Tor servers
  11914. while exiting, where various threads are trying to log that they're
  11915. exiting, and delete the logs, at the same time.
  11916. - Make our unit tests pass again on certain obscure platforms.
  11917. o Other fixes:
  11918. - Add support for building SUSE RPM packages.
  11919. - Speed up initial bootstrapping for clients: if we are making our
  11920. first ever connection to any entry guard, then don't mark it down
  11921. right after that.
  11922. - When only one Tor server in the network is labelled as a guard,
  11923. and we've already picked him, we would cycle endlessly picking him
  11924. again, being unhappy about it, etc. Now we specifically exclude
  11925. current guards when picking a new guard.
  11926. - Servers send create cells more reliably after the TLS connection
  11927. is established: we were sometimes forgetting to send half of them
  11928. when we had more than one pending.
  11929. - If we get a create cell that asks us to extend somewhere, but the
  11930. Tor server there doesn't match the expected digest, we now send
  11931. a destroy cell back, rather than silently doing nothing.
  11932. - Make options->RedirectExit work again.
  11933. - Make cookie authentication for the controller work again.
  11934. - Stop being picky about unusual characters in the arguments to
  11935. mapaddress. It's none of our business.
  11936. - Add a new config option "TestVia" that lets you specify preferred
  11937. middle hops to use for test circuits. Perhaps this will let me
  11938. debug the reachability problems better.
  11939. o Log / documentation fixes:
  11940. - If we're a server and some peer has a broken TLS certificate, don't
  11941. log about it unless ProtocolWarnings is set, i.e., we want to hear
  11942. about protocol violations by others.
  11943. - Fix spelling of VirtualAddrNetwork in man page.
  11944. - Add a better explanation at the top of the autogenerated torrc file
  11945. about what happened to our old torrc.
  11946. Changes in version 0.1.1.20 - 2006-05-23
  11947. o Crash and assert fixes from 0.1.0.17:
  11948. - Fix assert bug in close_logs() on exit: when we close and delete
  11949. logs, remove them all from the global "logfiles" list.
  11950. - Fix an assert error when we're out of space in the connection_list
  11951. and we try to post a hidden service descriptor (reported by Peter
  11952. Palfrader).
  11953. - Fix a rare assert error when we've tried all intro points for
  11954. a hidden service and we try fetching the service descriptor again:
  11955. "Assertion conn->state != AP_CONN_STATE_RENDDESC_WAIT failed".
  11956. - Setconf SocksListenAddress kills Tor if it fails to bind. Now back
  11957. out and refuse the setconf if it would fail.
  11958. - If you specify a relative torrc path and you set RunAsDaemon in
  11959. your torrc, then it chdir()'s to the new directory. If you then
  11960. HUP, it tries to load the new torrc location, fails, and exits.
  11961. The fix: no longer allow a relative path to torrc when using -f.
  11962. - Check for integer overflows in more places, when adding elements
  11963. to smartlists. This could possibly prevent a buffer overflow
  11964. on malicious huge inputs.
  11965. o Security fixes, major:
  11966. - When we're printing strings from the network, don't try to print
  11967. non-printable characters. Now we're safer against shell escape
  11968. sequence exploits, and also against attacks to fool users into
  11969. misreading their logs.
  11970. - Implement entry guards: automatically choose a handful of entry
  11971. nodes and stick with them for all circuits. Only pick new guards
  11972. when the ones you have are unsuitable, and if the old guards
  11973. become suitable again, switch back. This will increase security
  11974. dramatically against certain end-point attacks. The EntryNodes
  11975. config option now provides some hints about which entry guards you
  11976. want to use most; and StrictEntryNodes means to only use those.
  11977. Fixes CVE-2006-0414.
  11978. - Implement exit enclaves: if we know an IP address for the
  11979. destination, and there's a running Tor server at that address
  11980. which allows exit to the destination, then extend the circuit to
  11981. that exit first. This provides end-to-end encryption and end-to-end
  11982. authentication. Also, if the user wants a .exit address or enclave,
  11983. use 4 hops rather than 3, and cannibalize a general circ for it
  11984. if you can.
  11985. - Obey our firewall options more faithfully:
  11986. . If we can't get to a dirserver directly, try going via Tor.
  11987. . Don't ever try to connect (as a client) to a place our
  11988. firewall options forbid.
  11989. . If we specify a proxy and also firewall options, obey the
  11990. firewall options even when we're using the proxy: some proxies
  11991. can only proxy to certain destinations.
  11992. - Make clients regenerate their keys when their IP address changes.
  11993. - For the OS X package's modified privoxy config file, comment
  11994. out the "logfile" line so we don't log everything passed
  11995. through privoxy.
  11996. - Our TLS handshakes were generating a single public/private
  11997. keypair for the TLS context, rather than making a new one for
  11998. each new connection. Oops. (But we were still rotating them
  11999. periodically, so it's not so bad.)
  12000. - When we were cannibalizing a circuit with a particular exit
  12001. node in mind, we weren't checking to see if that exit node was
  12002. already present earlier in the circuit. Now we are.
  12003. - Require server descriptors to list IPv4 addresses -- hostnames
  12004. are no longer allowed. This also fixes potential vulnerabilities
  12005. to servers providing hostnames as their address and then
  12006. preferentially resolving them so they can partition users.
  12007. - Our logic to decide if the OR we connected to was the right guy
  12008. was brittle and maybe open to a mitm for invalid routers.
  12009. o Security fixes, minor:
  12010. - Adjust tor-spec.txt to parameterize cell and key lengths. Now
  12011. Ian Goldberg can prove things about our handshake protocol more
  12012. easily.
  12013. - Make directory authorities generate a separate "guard" flag to
  12014. mean "would make a good entry guard". Clients now honor the
  12015. is_guard flag rather than looking at is_fast or is_stable.
  12016. - Try to list MyFamily elements by key, not by nickname, and warn
  12017. if we've not heard of a server.
  12018. - Start using RAND_bytes rather than RAND_pseudo_bytes from
  12019. OpenSSL. Also, reseed our entropy every hour, not just at
  12020. startup. And add entropy in 512-bit chunks, not 160-bit chunks.
  12021. - Refuse server descriptors where the fingerprint line doesn't match
  12022. the included identity key. Tor doesn't care, but other apps (and
  12023. humans) might actually be trusting the fingerprint line.
  12024. - We used to kill the circuit when we receive a relay command we
  12025. don't recognize. Now we just drop that cell.
  12026. - Fix a bug found by Lasse Overlier: when we were making internal
  12027. circuits (intended to be cannibalized later for rendezvous and
  12028. introduction circuits), we were picking them so that they had
  12029. useful exit nodes. There was no need for this, and it actually
  12030. aids some statistical attacks.
  12031. - Start treating internal circuits and exit circuits separately.
  12032. It's important to keep them separate because internal circuits
  12033. have their last hops picked like middle hops, rather than like
  12034. exit hops. So exiting on them will break the user's expectations.
  12035. - Fix a possible way to DoS dirservers.
  12036. - When the client asked for a rendezvous port that the hidden
  12037. service didn't want to provide, we were sending an IP address
  12038. back along with the end cell. Fortunately, it was zero. But stop
  12039. that anyway.
  12040. o Packaging improvements:
  12041. - Implement --with-libevent-dir option to ./configure. Improve
  12042. search techniques to find libevent, and use those for openssl too.
  12043. - Fix a couple of bugs in OpenSSL detection. Deal better when
  12044. there are multiple SSLs installed with different versions.
  12045. - Avoid warnings about machine/limits.h on Debian GNU/kFreeBSD.
  12046. - On non-gcc compilers (e.g. Solaris's cc), use "-g -O" instead of
  12047. "-Wall -g -O2".
  12048. - Make unit tests (and other invocations that aren't the real Tor)
  12049. run without launching listeners, creating subdirectories, and so on.
  12050. - The OS X installer was adding a symlink for tor_resolve but
  12051. the binary was called tor-resolve (reported by Thomas Hardly).
  12052. - Now we can target arch and OS in rpm builds (contributed by
  12053. Phobos). Also make the resulting dist-rpm filename match the
  12054. target arch.
  12055. - Apply Matt Ghali's --with-syslog-facility patch to ./configure
  12056. if you log to syslog and want something other than LOG_DAEMON.
  12057. - Fix the torify (tsocks) config file to not use Tor for localhost
  12058. connections.
  12059. - Start shipping socks-extensions.txt, tor-doc-unix.html,
  12060. tor-doc-server.html, and stylesheet.css in the tarball.
  12061. - Stop shipping tor-doc.html, INSTALL, and README in the tarball.
  12062. They are useless now.
  12063. - Add Peter Palfrader's contributed check-tor script. It lets you
  12064. easily check whether a given server (referenced by nickname)
  12065. is reachable by you.
  12066. - Add BSD-style contributed startup script "rc.subr" from Peter
  12067. Thoenen.
  12068. o Directory improvements -- new directory protocol:
  12069. - See tor/doc/dir-spec.txt for all the juicy details. Key points:
  12070. - Authorities and caches publish individual descriptors (by
  12071. digest, by fingerprint, by "all", and by "tell me yours").
  12072. - Clients don't download or use the old directory anymore. Now they
  12073. download network-statuses from the directory authorities, and
  12074. fetch individual server descriptors as needed from mirrors.
  12075. - Clients don't download descriptors of non-running servers.
  12076. - Download descriptors by digest, not by fingerprint. Caches try to
  12077. download all listed digests from authorities; clients try to
  12078. download "best" digests from caches. This avoids partitioning
  12079. and isolating attacks better.
  12080. - Only upload a new server descriptor when options change, 18
  12081. hours have passed, uptime is reset, or bandwidth changes a lot.
  12082. - Directory authorities silently throw away new descriptors that
  12083. haven't changed much if the timestamps are similar. We do this to
  12084. tolerate older Tor servers that upload a new descriptor every 15
  12085. minutes. (It seemed like a good idea at the time.)
  12086. - Clients choose directory servers from the network status lists,
  12087. not from their internal list of router descriptors. Now they can
  12088. go to caches directly rather than needing to go to authorities
  12089. to bootstrap the first set of descriptors.
  12090. - When picking a random directory, prefer non-authorities if any
  12091. are known.
  12092. - Add a new flag to network-status indicating whether the server
  12093. can answer v2 directory requests too.
  12094. - Directory mirrors now cache up to 16 unrecognized network-status
  12095. docs, so new directory authorities will be cached too.
  12096. - Stop parsing, storing, or using running-routers output (but
  12097. mirrors still cache and serve it).
  12098. - Clients consider a threshold of "versioning" directory authorities
  12099. before deciding whether to warn the user that he's obsolete.
  12100. - Authorities publish separate sorted lists of recommended versions
  12101. for clients and for servers.
  12102. - Change DirServers config line to note which dirs are v1 authorities.
  12103. - Put nicknames on the DirServer line, so we can refer to them
  12104. without requiring all our users to memorize their IP addresses.
  12105. - Remove option when getting directory cache to see whether they
  12106. support running-routers; they all do now. Replace it with one
  12107. to see whether caches support v2 stuff.
  12108. - Stop listing down or invalid nodes in the v1 directory. This
  12109. reduces its bulk by about 1/3, and reduces load on mirrors.
  12110. - Mirrors no longer cache the v1 directory as often.
  12111. - If we as a directory mirror don't know of any v1 directory
  12112. authorities, then don't try to cache any v1 directories.
  12113. o Other directory improvements:
  12114. - Add lefkada.eecs.harvard.edu and tor.dizum.com as fourth and
  12115. fifth authoritative directory servers.
  12116. - Directory authorities no longer require an open connection from
  12117. a server to consider him "reachable". We need this change because
  12118. when we add new directory authorities, old servers won't know not
  12119. to hang up on them.
  12120. - Dir authorities now do their own external reachability testing
  12121. of each server, and only list as running the ones they found to
  12122. be reachable. We also send back warnings to the server's logs if
  12123. it uploads a descriptor that we already believe is unreachable.
  12124. - Spread the directory authorities' reachability testing over the
  12125. entire testing interval, so we don't try to do 500 TLS's at once
  12126. every 20 minutes.
  12127. - Make the "stable" router flag in network-status be the median of
  12128. the uptimes of running valid servers, and make clients pay
  12129. attention to the network-status flags. Thus the cutoff adapts
  12130. to the stability of the network as a whole, making IRC, IM, etc
  12131. connections more reliable.
  12132. - Make the v2 dir's "Fast" flag based on relative capacity, just
  12133. like "Stable" is based on median uptime. Name everything in the
  12134. top 7/8 Fast, and only the top 1/2 gets to be a Guard.
  12135. - Retry directory requests if we fail to get an answer we like
  12136. from a given dirserver (we were retrying before, but only if
  12137. we fail to connect).
  12138. - Return a robots.txt on our dirport to discourage google indexing.
  12139. o Controller protocol improvements:
  12140. - Revised controller protocol (version 1) that uses ascii rather
  12141. than binary: tor/doc/control-spec.txt. Add supporting libraries
  12142. in python and java and c# so you can use the controller from your
  12143. applications without caring how our protocol works.
  12144. - Allow the DEBUG controller event to work again. Mark certain log
  12145. entries as "don't tell this to controllers", so we avoid cycles.
  12146. - New controller function "getinfo accounting", to ask how
  12147. many bytes we've used in this time period.
  12148. - Add a "resetconf" command so you can set config options like
  12149. AllowUnverifiedNodes and LongLivedPorts to "". Also, if you give
  12150. a config option in the torrc with no value, then it clears it
  12151. entirely (rather than setting it to its default).
  12152. - Add a "getinfo config-file" to tell us where torrc is. Also
  12153. expose guard nodes, config options/names.
  12154. - Add a "quit" command (when when using the controller manually).
  12155. - Add a new signal "newnym" to "change pseudonyms" -- that is, to
  12156. stop using any currently-dirty circuits for new streams, so we
  12157. don't link new actions to old actions. This also occurs on HUP
  12158. or "signal reload".
  12159. - If we would close a stream early (e.g. it asks for a .exit that
  12160. we know would refuse it) but the LeaveStreamsUnattached config
  12161. option is set by the controller, then don't close it.
  12162. - Add a new controller event type "authdir_newdescs" that allows
  12163. controllers to get all server descriptors that were uploaded to
  12164. a router in its role as directory authority.
  12165. - New controller option "getinfo desc/all-recent" to fetch the
  12166. latest server descriptor for every router that Tor knows about.
  12167. - Fix the controller's "attachstream 0" command to treat conn like
  12168. it just connected, doing address remapping, handling .exit and
  12169. .onion idioms, and so on. Now we're more uniform in making sure
  12170. that the controller hears about new and closing connections.
  12171. - Permit transitioning from ORPort==0 to ORPort!=0, and back, from
  12172. the controller. Also, rotate dns and cpu workers if the controller
  12173. changes options that will affect them; and initialize the dns
  12174. worker cache tree whether or not we start out as a server.
  12175. - Add a new circuit purpose 'controller' to let the controller ask
  12176. for a circuit that Tor won't try to use. Extend the "extendcircuit"
  12177. controller command to let you specify the purpose if you're starting
  12178. a new circuit. Add a new "setcircuitpurpose" controller command to
  12179. let you change a circuit's purpose after it's been created.
  12180. - Let the controller ask for "getinfo dir/server/foo" so it can ask
  12181. directly rather than connecting to the dir port. "getinfo
  12182. dir/status/foo" also works, but currently only if your DirPort
  12183. is enabled.
  12184. - Let the controller tell us about certain router descriptors
  12185. that it doesn't want Tor to use in circuits. Implement
  12186. "setrouterpurpose" and modify "+postdescriptor" to do this.
  12187. - If the controller's *setconf commands fail, collect an error
  12188. message in a string and hand it back to the controller -- don't
  12189. just tell them to go read their logs.
  12190. o Scalability, resource management, and performance:
  12191. - Fix a major load balance bug: we were round-robin reading in 16 KB
  12192. chunks, and servers with bandwidthrate of 20 KB, while downloading
  12193. a 600 KB directory, would starve their other connections. Now we
  12194. try to be a bit more fair.
  12195. - Be more conservative about whether to advertise our DirPort.
  12196. The main change is to not advertise if we're running at capacity
  12197. and either a) we could hibernate ever or b) our capacity is low
  12198. and we're using a default DirPort.
  12199. - We weren't cannibalizing circuits correctly for
  12200. CIRCUIT_PURPOSE_C_ESTABLISH_REND and
  12201. CIRCUIT_PURPOSE_S_ESTABLISH_INTRO, so we were being forced to
  12202. build those from scratch. This should make hidden services faster.
  12203. - Predict required circuits better, with an eye toward making hidden
  12204. services faster on the service end.
  12205. - Compress exit policies even more: look for duplicate lines and
  12206. remove them.
  12207. - Generate 18.0.0.0/8 address policy format in descs when we can;
  12208. warn when the mask is not reducible to a bit-prefix.
  12209. - There used to be two ways to specify your listening ports in a
  12210. server descriptor: on the "router" line and with a separate "ports"
  12211. line. Remove support for the "ports" line.
  12212. - Reduce memory requirements in our structs by changing the order
  12213. of fields. Replace balanced trees with hash tables. Inline
  12214. bottleneck smartlist functions. Add a "Map from digest to void*"
  12215. abstraction so we can do less hex encoding/decoding, and use it
  12216. in router_get_by_digest(). Many other CPU and memory improvements.
  12217. - Allow tor_gzip_uncompress to extract as much as possible from
  12218. truncated compressed data. Try to extract as many
  12219. descriptors as possible from truncated http responses (when
  12220. purpose is DIR_PURPOSE_FETCH_ROUTERDESC).
  12221. - Make circ->onionskin a pointer, not a static array. moria2 was using
  12222. 125000 circuit_t's after it had been up for a few weeks, which
  12223. translates to 20+ megs of wasted space.
  12224. - The private half of our EDH handshake keys are now chosen out
  12225. of 320 bits, not 1024 bits. (Suggested by Ian Goldberg.)
  12226. - Stop doing the complex voodoo overkill checking for insecure
  12227. Diffie-Hellman keys. Just check if it's in [2,p-2] and be happy.
  12228. - Do round-robin writes for TLS of at most 16 kB per write. This
  12229. might be more fair on loaded Tor servers.
  12230. - Do not use unaligned memory access on alpha, mips, or mipsel.
  12231. It *works*, but is very slow, so we treat them as if it doesn't.
  12232. o Other bugfixes and improvements:
  12233. - Start storing useful information to $DATADIR/state, so we can
  12234. remember things across invocations of Tor. Retain unrecognized
  12235. lines so we can be forward-compatible, and write a TorVersion line
  12236. so we can be backward-compatible.
  12237. - If ORPort is set, Address is not explicitly set, and our hostname
  12238. resolves to a private IP address, try to use an interface address
  12239. if it has a public address. Now Windows machines that think of
  12240. themselves as localhost can guess their address.
  12241. - Regenerate our local descriptor if it's dirty and we try to use
  12242. it locally (e.g. if it changes during reachability detection).
  12243. This was causing some Tor servers to keep publishing the same
  12244. initial descriptor forever.
  12245. - Tor servers with dynamic IP addresses were needing to wait 18
  12246. hours before they could start doing reachability testing using
  12247. the new IP address and ports. This is because they were using
  12248. the internal descriptor to learn what to test, yet they were only
  12249. rebuilding the descriptor once they decided they were reachable.
  12250. - It turns out we couldn't bootstrap a network since we added
  12251. reachability detection in 0.1.0.1-rc. Good thing the Tor network
  12252. has never gone down. Add an AssumeReachable config option to let
  12253. servers and authorities bootstrap. When we're trying to build a
  12254. high-uptime or high-bandwidth circuit but there aren't enough
  12255. suitable servers, try being less picky rather than simply failing.
  12256. - Newly bootstrapped Tor networks couldn't establish hidden service
  12257. circuits until they had nodes with high uptime. Be more tolerant.
  12258. - Really busy servers were keeping enough circuits open on stable
  12259. connections that they were wrapping around the circuit_id
  12260. space. (It's only two bytes.) This exposed a bug where we would
  12261. feel free to reuse a circuit_id even if it still exists but has
  12262. been marked for close. Try to fix this bug. Some bug remains.
  12263. - When we fail to bind or listen on an incoming or outgoing
  12264. socket, we now close it before refusing, rather than just
  12265. leaking it. (Thanks to Peter Palfrader for finding.)
  12266. - Fix a file descriptor leak in start_daemon().
  12267. - On Windows, you can't always reopen a port right after you've
  12268. closed it. So change retry_listeners() to only close and re-open
  12269. ports that have changed.
  12270. - Workaround a problem with some http proxies that refuse GET
  12271. requests that specify "Content-Length: 0". Reported by Adrian.
  12272. - Recover better from TCP connections to Tor servers that are
  12273. broken but don't tell you (it happens!); and rotate TLS
  12274. connections once a week.
  12275. - Fix a scary-looking but apparently harmless bug where circuits
  12276. would sometimes start out in state CIRCUIT_STATE_OR_WAIT at
  12277. servers, and never switch to state CIRCUIT_STATE_OPEN.
  12278. - Check for even more Windows version flags when writing the platform
  12279. string in server descriptors, and note any we don't recognize.
  12280. - Add reasons to DESTROY and RELAY_TRUNCATED cells, so clients can
  12281. get a better idea of why their circuits failed. Not used yet.
  12282. - Add TTLs to RESOLVED, CONNECTED, and END_REASON_EXITPOLICY cells.
  12283. We don't use them yet, but maybe one day our DNS resolver will be
  12284. able to discover them.
  12285. - Let people type "tor --install" as well as "tor -install" when they
  12286. want to make it an NT service.
  12287. - Looks like we were never delivering deflated (i.e. compressed)
  12288. running-routers lists, even when asked. Oops.
  12289. - We were leaking some memory every time the client changed IPs.
  12290. - Clean up more of the OpenSSL memory when exiting, so we can detect
  12291. memory leaks better.
  12292. - Never call free() on tor_malloc()d memory. This will help us
  12293. use dmalloc to detect memory leaks.
  12294. - Some Tor servers process billions of cells per day. These
  12295. statistics are now uint64_t's.
  12296. - Check [X-]Forwarded-For headers in HTTP requests when generating
  12297. log messages. This lets people run dirservers (and caches) behind
  12298. Apache but still know which IP addresses are causing warnings.
  12299. - Fix minor integer overflow in calculating when we expect to use up
  12300. our bandwidth allocation before hibernating.
  12301. - Lower the minimum required number of file descriptors to 1000,
  12302. so we can have some overhead for Valgrind on Linux, where the
  12303. default ulimit -n is 1024.
  12304. - Stop writing the "router.desc" file, ever. Nothing uses it anymore,
  12305. and its existence is confusing some users.
  12306. o Config option fixes:
  12307. - Add a new config option ExitPolicyRejectPrivate which defaults
  12308. to on. Now all exit policies will begin with rejecting private
  12309. addresses, unless the server operator explicitly turns it off.
  12310. - Bump the default bandwidthrate to 3 MB, and burst to 6 MB.
  12311. - Add new ReachableORAddresses and ReachableDirAddresses options
  12312. that understand address policies. FascistFirewall is now a synonym
  12313. for "ReachableORAddresses *:443", "ReachableDirAddresses *:80".
  12314. - Start calling it FooListenAddress rather than FooBindAddress,
  12315. since few of our users know what it means to bind an address
  12316. or port.
  12317. - If the user gave Tor an odd number of command-line arguments,
  12318. we were silently ignoring the last one. Now we complain and fail.
  12319. This wins the oldest-bug prize -- this bug has been present since
  12320. November 2002, as released in Tor 0.0.0.
  12321. - If you write "HiddenServicePort 6667 127.0.0.1 6668" in your
  12322. torrc rather than "HiddenServicePort 6667 127.0.0.1:6668",
  12323. it would silently ignore the 6668.
  12324. - If we get a linelist or linelist_s config option from the torrc,
  12325. e.g. ExitPolicy, and it has no value, warn and skip rather than
  12326. silently resetting it to its default.
  12327. - Setconf was appending items to linelists, not clearing them.
  12328. - Add MyFamily to torrc.sample in the server section, so operators
  12329. will be more likely to learn that it exists.
  12330. - Make ContactInfo mandatory for authoritative directory servers.
  12331. - MaxConn has been obsolete for a while now. Document the ConnLimit
  12332. config option, which is a *minimum* number of file descriptors
  12333. that must be available else Tor refuses to start.
  12334. - Get rid of IgnoreVersion undocumented config option, and make us
  12335. only warn, never exit, when we're running an obsolete version.
  12336. - Make MonthlyAccountingStart config option truly obsolete now.
  12337. - Correct the man page entry on TrackHostExitsExpire.
  12338. - Let directory authorities start even if they don't specify an
  12339. Address config option.
  12340. - Change "AllowUnverifiedNodes" to "AllowInvalidNodes", to
  12341. reflect the updated flags in our v2 dir protocol.
  12342. o Config option features:
  12343. - Add a new config option FastFirstHopPK (on by default) so clients
  12344. do a trivial crypto handshake for their first hop, since TLS has
  12345. already taken care of confidentiality and authentication.
  12346. - Let the user set ControlListenAddress in the torrc. This can be
  12347. dangerous, but there are some cases (like a secured LAN) where it
  12348. makes sense.
  12349. - New config options to help controllers: FetchServerDescriptors
  12350. and FetchHidServDescriptors for whether to fetch server
  12351. info and hidserv info or let the controller do it, and
  12352. PublishServerDescriptor and PublishHidServDescriptors.
  12353. - Also let the controller set the __AllDirActionsPrivate config
  12354. option if you want all directory fetches/publishes to happen via
  12355. Tor (it assumes your controller bootstraps your circuits).
  12356. - Add "HardwareAccel" config option: support for crypto hardware
  12357. accelerators via OpenSSL. Off by default, until we find somebody
  12358. smart who can test it for us. (It appears to produce seg faults
  12359. in at least some cases.)
  12360. - New config option "AuthDirRejectUnlisted" for directory authorities
  12361. as a panic button: if we get flooded with unusable servers we can
  12362. revert to only listing servers in the approved-routers file.
  12363. - Directory authorities can now reject/invalidate by key and IP,
  12364. with the config options "AuthDirInvalid" and "AuthDirReject", or
  12365. by marking a fingerprint as "!reject" or "!invalid" (as its
  12366. nickname) in the approved-routers file. This is useful since
  12367. currently we automatically list servers as running and usable
  12368. even if we know they're jerks.
  12369. - Add a new config option TestSocks so people can see whether their
  12370. applications are using socks4, socks4a, socks5-with-ip, or
  12371. socks5-with-fqdn. This way they don't have to keep mucking
  12372. with tcpdump and wondering if something got cached somewhere.
  12373. - Add "private:*" as an alias in configuration for policies. Now
  12374. you can simplify your exit policy rather than needing to list
  12375. every single internal or nonroutable network space.
  12376. - Accept "private:*" in routerdesc exit policies; not generated yet
  12377. because older Tors do not understand it.
  12378. - Add configuration option "V1AuthoritativeDirectory 1" which
  12379. moria1, moria2, and tor26 have set.
  12380. - Implement an option, VirtualAddrMask, to set which addresses
  12381. get handed out in response to mapaddress requests. This works
  12382. around a bug in tsocks where 127.0.0.0/8 is never socksified.
  12383. - Add a new config option FetchUselessDescriptors, off by default,
  12384. for when you plan to run "exitlist" on your client and you want
  12385. to know about even the non-running descriptors.
  12386. - SocksTimeout: How long do we let a socks connection wait
  12387. unattached before we fail it?
  12388. - CircuitBuildTimeout: Cull non-open circuits that were born
  12389. at least this many seconds ago.
  12390. - CircuitIdleTimeout: Cull open clean circuits that were born
  12391. at least this many seconds ago.
  12392. - New config option SafeSocks to reject all application connections
  12393. using unsafe socks protocols. Defaults to off.
  12394. o Improved and clearer log messages:
  12395. - Reduce clutter in server logs. We're going to try to make
  12396. them actually usable now. New config option ProtocolWarnings that
  12397. lets you hear about how _other Tors_ are breaking the protocol. Off
  12398. by default.
  12399. - Divide log messages into logging domains. Once we put some sort
  12400. of interface on this, it will let people looking at more verbose
  12401. log levels specify the topics they want to hear more about.
  12402. - Log server fingerprint on startup, so new server operators don't
  12403. have to go hunting around their filesystem for it.
  12404. - Provide dire warnings to any users who set DirServer manually;
  12405. move it out of torrc.sample and into torrc.complete.
  12406. - Make the log message less scary when all the dirservers are
  12407. temporarily unreachable.
  12408. - When tor_socketpair() fails in Windows, give a reasonable
  12409. Windows-style errno back.
  12410. - Improve tor_gettimeofday() granularity on windows.
  12411. - We were printing the number of idle dns workers incorrectly when
  12412. culling them.
  12413. - Handle duplicate lines in approved-routers files without warning.
  12414. - We were whining about using socks4 or socks5-with-local-lookup
  12415. even when it's an IP address in the "virtual" range we designed
  12416. exactly for this case.
  12417. - Check for named servers when looking them up by nickname;
  12418. warn when we're calling a non-named server by its nickname;
  12419. don't warn twice about the same name.
  12420. - Downgrade the dirserver log messages when whining about
  12421. unreachability.
  12422. - Correct "your server is reachable" log entries to indicate that
  12423. it was self-testing that told us so.
  12424. - If we're trying to be a Tor server and running Windows 95/98/ME
  12425. as a server, explain that we'll likely crash.
  12426. - Provide a more useful warn message when our onion queue gets full:
  12427. the CPU is too slow or the exit policy is too liberal.
  12428. - Don't warn when we receive a 503 from a dirserver/cache -- this
  12429. will pave the way for them being able to refuse if they're busy.
  12430. - When we fail to bind a listener, try to provide a more useful
  12431. log message: e.g., "Is Tor already running?"
  12432. - Only start testing reachability once we've established a
  12433. circuit. This will make startup on dir authorities less noisy.
  12434. - Don't try to upload hidden service descriptors until we have
  12435. established a circuit.
  12436. - Tor didn't warn when it failed to open a log file.
  12437. - Warn when listening on a public address for socks. We suspect a
  12438. lot of people are setting themselves up as open socks proxies,
  12439. and they have no idea that jerks on the Internet are using them,
  12440. since they simply proxy the traffic into the Tor network.
  12441. - Give a useful message when people run Tor as the wrong user,
  12442. rather than telling them to start chowning random directories.
  12443. - Fix a harmless bug that was causing Tor servers to log
  12444. "Got an end because of misc error, but we're not an AP. Closing."
  12445. - Fix wrong log message when you add a "HiddenServiceNodes" config
  12446. line without any HiddenServiceDir line (reported by Chris Thomas).
  12447. - Directory authorities now stop whining so loudly about bad
  12448. descriptors that they fetch from other dirservers. So when there's
  12449. a log complaint, it's for sure from a freshly uploaded descriptor.
  12450. - When logging via syslog, include the pid whenever we provide
  12451. a log entry. Suggested by Todd Fries.
  12452. - When we're shutting down and we do something like try to post a
  12453. server descriptor or rendezvous descriptor, don't complain that
  12454. we seem to be unreachable. Of course we are, we're shutting down.
  12455. - Change log line for unreachability to explicitly suggest /etc/hosts
  12456. as the culprit. Also make it clearer what IP address and ports we're
  12457. testing for reachability.
  12458. - Put quotes around user-supplied strings when logging so users are
  12459. more likely to realize if they add bad characters (like quotes)
  12460. to the torrc.
  12461. - NT service patch from Matt Edman to improve error messages on Win32.
  12462. Changes in version 0.1.0.17 - 2006-02-17
  12463. o Crash bugfixes on 0.1.0.x:
  12464. - When servers with a non-zero DirPort came out of hibernation,
  12465. sometimes they would trigger an assert.
  12466. o Other important bugfixes:
  12467. - On platforms that don't have getrlimit (like Windows), we were
  12468. artificially constraining ourselves to a max of 1024
  12469. connections. Now just assume that we can handle as many as 15000
  12470. connections. Hopefully this won't cause other problems.
  12471. o Backported features:
  12472. - When we're a server, a client asks for an old-style directory,
  12473. and our write bucket is empty, don't give it to him. This way
  12474. small servers can continue to serve the directory *sometimes*,
  12475. without getting overloaded.
  12476. - Whenever you get a 503 in response to a directory fetch, try
  12477. once more. This will become important once servers start sending
  12478. 503's whenever they feel busy.
  12479. - Fetch a new directory every 120 minutes, not every 40 minutes.
  12480. Now that we have hundreds of thousands of users running the old
  12481. directory algorithm, it's starting to hurt a lot.
  12482. - Bump up the period for forcing a hidden service descriptor upload
  12483. from 20 minutes to 1 hour.
  12484. Changes in version 0.1.0.16 - 2006-01-02
  12485. o Crash bugfixes on 0.1.0.x:
  12486. - On Windows, build with a libevent patch from "I-M Weasel" to avoid
  12487. corrupting the heap, losing FDs, or crashing when we need to resize
  12488. the fd_sets. (This affects the Win32 binaries, not Tor's sources.)
  12489. - It turns out sparc64 platforms crash on unaligned memory access
  12490. too -- so detect and avoid this.
  12491. - Handle truncated compressed data correctly (by detecting it and
  12492. giving an error).
  12493. - Fix possible-but-unlikely free(NULL) in control.c.
  12494. - When we were closing connections, there was a rare case that
  12495. stomped on memory, triggering seg faults and asserts.
  12496. - Avoid potential infinite recursion when building a descriptor. (We
  12497. don't know that it ever happened, but better to fix it anyway.)
  12498. - We were neglecting to unlink marked circuits from soon-to-close OR
  12499. connections, which caused some rare scribbling on freed memory.
  12500. - Fix a memory stomping race bug when closing the joining point of two
  12501. rendezvous circuits.
  12502. - Fix an assert in time parsing found by Steven Murdoch.
  12503. o Other bugfixes on 0.1.0.x:
  12504. - When we're doing reachability testing, provide more useful log
  12505. messages so the operator knows what to expect.
  12506. - Do not check whether DirPort is reachable when we are suppressing
  12507. advertising it because of hibernation.
  12508. - When building with -static or on Solaris, we sometimes needed -ldl.
  12509. - One of the dirservers (tor26) changed its IP address.
  12510. - When we're deciding whether a stream has enough circuits around
  12511. that can handle it, count the freshly dirty ones and not the ones
  12512. that are so dirty they won't be able to handle it.
  12513. - When we're expiring old circuits, we had a logic error that caused
  12514. us to close new rendezvous circuits rather than old ones.
  12515. - Give a more helpful log message when you try to change ORPort via
  12516. the controller: you should upgrade Tor if you want that to work.
  12517. - We were failing to parse Tor versions that start with "Tor ".
  12518. - Tolerate faulty streams better: when a stream fails for reason
  12519. exitpolicy, stop assuming that the router is lying about his exit
  12520. policy. When a stream fails for reason misc, allow it to retry just
  12521. as if it was resolvefailed. When a stream has failed three times,
  12522. reset its failure count so we can try again and get all three tries.
  12523. Changes in version 0.1.0.15 - 2005-09-23
  12524. o Bugfixes on 0.1.0.x:
  12525. - Reject ports 465 and 587 (spam targets) in default exit policy.
  12526. - Don't crash when we don't have any spare file descriptors and we
  12527. try to spawn a dns or cpu worker.
  12528. - Get rid of IgnoreVersion undocumented config option, and make us
  12529. only warn, never exit, when we're running an obsolete version.
  12530. - Don't try to print a null string when your server finds itself to
  12531. be unreachable and the Address config option is empty.
  12532. - Make the numbers in read-history and write-history into uint64s,
  12533. so they don't overflow and publish negatives in the descriptor.
  12534. - Fix a minor memory leak in smartlist_string_remove().
  12535. - We were only allowing ourselves to upload a server descriptor at
  12536. most every 20 minutes, even if it changed earlier than that.
  12537. - Clean up log entries that pointed to old URLs.
  12538. Changes in version 0.1.0.14 - 2005-08-08
  12539. o Bugfixes on 0.1.0.x:
  12540. - Fix the other half of the bug with crypto handshakes
  12541. (CVE-2005-2643).
  12542. - Fix an assert trigger if you send a 'signal term' via the
  12543. controller when it's listening for 'event info' messages.
  12544. Changes in version 0.1.0.13 - 2005-08-04
  12545. o Bugfixes on 0.1.0.x:
  12546. - Fix a critical bug in the security of our crypto handshakes.
  12547. - Fix a size_t underflow in smartlist_join_strings2() that made
  12548. it do bad things when you hand it an empty smartlist.
  12549. - Fix Windows installer to ship Tor license (thanks to Aphex for
  12550. pointing out this oversight) and put a link to the doc directory
  12551. in the start menu.
  12552. - Explicitly set no-unaligned-access for sparc: it turns out the
  12553. new gcc's let you compile broken code, but that doesn't make it
  12554. not-broken.
  12555. Changes in version 0.1.0.12 - 2005-07-18
  12556. o New directory servers:
  12557. - tor26 has changed IP address.
  12558. o Bugfixes on 0.1.0.x:
  12559. - Fix a possible double-free in tor_gzip_uncompress().
  12560. - When --disable-threads is set, do not search for or link against
  12561. pthreads libraries.
  12562. - Don't trigger an assert if an authoritative directory server
  12563. claims its dirport is 0.
  12564. - Fix bug with removing Tor as an NT service: some people were
  12565. getting "The service did not return an error." Thanks to Matt
  12566. Edman for the fix.
  12567. Changes in version 0.1.0.11 - 2005-06-30
  12568. o Bugfixes on 0.1.0.x:
  12569. - Fix major security bug: servers were disregarding their
  12570. exit policies if clients behaved unexpectedly.
  12571. - Make OS X init script check for missing argument, so we don't
  12572. confuse users who invoke it incorrectly.
  12573. - Fix a seg fault in "tor --hash-password foo".
  12574. - The MAPADDRESS control command was broken.
  12575. Changes in version 0.1.0.10 - 2005-06-14
  12576. o Fixes on Win32:
  12577. - Make NT services work and start on startup on Win32 (based on
  12578. patch by Matt Edman). See the FAQ entry for details.
  12579. - Make 'platform' string in descriptor more accurate for Win32
  12580. servers, so it's not just "unknown platform".
  12581. - REUSEADDR on normal platforms means you can rebind to the port
  12582. right after somebody else has let it go. But REUSEADDR on Win32
  12583. means you can bind to the port _even when somebody else already
  12584. has it bound_! So, don't do that on Win32.
  12585. - Clean up the log messages when starting on Win32 with no config
  12586. file.
  12587. - Allow seeding the RNG on Win32 even when you're not running as
  12588. Administrator. If seeding the RNG on Win32 fails, quit.
  12589. o Assert / crash bugs:
  12590. - Refuse relay cells that claim to have a length larger than the
  12591. maximum allowed. This prevents a potential attack that could read
  12592. arbitrary memory (e.g. keys) from an exit server's process
  12593. (CVE-2005-2050).
  12594. - If unofficial Tor clients connect and send weird TLS certs, our
  12595. Tor server triggers an assert. Stop asserting, and start handling
  12596. TLS errors better in other situations too.
  12597. - Fix a race condition that can trigger an assert when we have a
  12598. pending create cell and an OR connection attempt fails.
  12599. o Resource leaks:
  12600. - Use pthreads for worker processes rather than forking. This was
  12601. forced because when we forked, we ended up wasting a lot of
  12602. duplicate ram over time.
  12603. - Also switch to foo_r versions of some library calls to allow
  12604. reentry and threadsafeness.
  12605. - Implement --disable-threads configure option. Disable threads on
  12606. netbsd and openbsd by default, because they have no reentrant
  12607. resolver functions (!), and on solaris since it has other
  12608. threading issues.
  12609. - Fix possible bug on threading platforms (e.g. win32) which was
  12610. leaking a file descriptor whenever a cpuworker or dnsworker died.
  12611. - Fix a minor memory leak when somebody establishes an introduction
  12612. point at your Tor server.
  12613. - Fix possible memory leak in tor_lookup_hostname(). (Thanks to
  12614. Adam Langley.)
  12615. - Add ./configure --with-dmalloc option, to track memory leaks.
  12616. - And try to free all memory on closing, so we can detect what
  12617. we're leaking.
  12618. o Protocol correctness:
  12619. - When we've connected to an OR and handshaked but didn't like
  12620. the result, we were closing the conn without sending destroy
  12621. cells back for pending circuits. Now send those destroys.
  12622. - Start sending 'truncated' cells back rather than destroy cells
  12623. if the circuit closes in front of you. This means we won't have
  12624. to abandon partially built circuits.
  12625. - Handle changed router status correctly when dirserver reloads
  12626. fingerprint file. We used to be dropping all unverified descriptors
  12627. right then. The bug was hidden because we would immediately
  12628. fetch a directory from another dirserver, which would include the
  12629. descriptors we just dropped.
  12630. - Revise tor-spec to add more/better stream end reasons.
  12631. - Revise all calls to connection_edge_end to avoid sending 'misc',
  12632. and to take errno into account where possible.
  12633. - Client now retries when streams end early for 'hibernating' or
  12634. 'resource limit' reasons, rather than failing them.
  12635. - Try to be more zealous about calling connection_edge_end when
  12636. things go bad with edge conns in connection.c.
  12637. o Robustness improvements:
  12638. - Better handling for heterogeneous / unreliable nodes:
  12639. - Annotate circuits with whether they aim to contain high uptime
  12640. nodes and/or high capacity nodes. When building circuits, choose
  12641. appropriate nodes.
  12642. - This means that every single node in an intro rend circuit,
  12643. not just the last one, will have a minimum uptime.
  12644. - New config option LongLivedPorts to indicate application streams
  12645. that will want high uptime circuits.
  12646. - Servers reset uptime when a dir fetch entirely fails. This
  12647. hopefully reflects stability of the server's network connectivity.
  12648. - If somebody starts his tor server in Jan 2004 and then fixes his
  12649. clock, don't make his published uptime be a year.
  12650. - Reset published uptime when we wake up from hibernation.
  12651. - Introduce a notion of 'internal' circs, which are chosen without
  12652. regard to the exit policy of the last hop. Intro and rendezvous
  12653. circs must be internal circs, to avoid leaking information. Resolve
  12654. and connect streams can use internal circs if they want.
  12655. - New circuit pooling algorithm: keep track of what destination ports
  12656. we've used recently (start out assuming we'll want to use 80), and
  12657. make sure to have enough circs around to satisfy these ports. Also
  12658. make sure to have 2 internal circs around if we've required internal
  12659. circs lately (and with high uptime if we've seen that lately too).
  12660. - Turn addr_policy_compare from a tristate to a quadstate; this should
  12661. help address our "Ah, you allow 1.2.3.4:80. You are a good choice
  12662. for google.com" problem.
  12663. - When a client asks us for a dir mirror and we don't have one,
  12664. launch an attempt to get a fresh one.
  12665. - First cut at support for "create-fast" cells. Clients can use
  12666. these when extending to their first hop, since the TLS already
  12667. provides forward secrecy and authentication. Not enabled on
  12668. clients yet.
  12669. o Reachability testing.
  12670. - Your Tor server will automatically try to see if its ORPort and
  12671. DirPort are reachable from the outside, and it won't upload its
  12672. descriptor until it decides at least ORPort is reachable (when
  12673. DirPort is not yet found reachable, publish it as zero).
  12674. - When building testing circs for ORPort testing, use only
  12675. high-bandwidth nodes, so fewer circuits fail.
  12676. - Notice when our IP changes, and reset stats/uptime/reachability.
  12677. - Authdirservers don't do ORPort reachability detection, since
  12678. they're in clique mode, so it will be rare to find a server not
  12679. already connected to them.
  12680. - Authdirservers now automatically approve nodes running 0.1.0.2-rc
  12681. or later.
  12682. o Dirserver fixes:
  12683. - Now we allow two unverified servers with the same nickname
  12684. but different keys. But if a nickname is verified, only that
  12685. nickname+key are allowed.
  12686. - If you're an authdirserver connecting to an address:port,
  12687. and it's not the OR you were expecting, forget about that
  12688. descriptor. If he *was* the one you were expecting, then forget
  12689. about all other descriptors for that address:port.
  12690. - Allow servers to publish descriptors from 12 hours in the future.
  12691. Corollary: only whine about clock skew from the dirserver if
  12692. he's a trusted dirserver (since now even verified servers could
  12693. have quite wrong clocks).
  12694. - Require servers that use the default dirservers to have public IP
  12695. addresses. We have too many servers that are configured with private
  12696. IPs and their admins never notice the log entries complaining that
  12697. their descriptors are being rejected.
  12698. o Efficiency improvements:
  12699. - Use libevent. Now we can use faster async cores (like epoll, kpoll,
  12700. and /dev/poll), and hopefully work better on Windows too.
  12701. - Apple's OS X 10.4.0 ships with a broken kqueue API, and using
  12702. kqueue on 10.3.9 causes kernel panics. Don't use kqueue on OS X.
  12703. - Find libevent even if it's hiding in /usr/local/ and your
  12704. CFLAGS and LDFLAGS don't tell you to look there.
  12705. - Be able to link with libevent as a shared library (the default
  12706. after 1.0d), even if it's hiding in /usr/local/lib and even
  12707. if you haven't added /usr/local/lib to your /etc/ld.so.conf,
  12708. assuming you're running gcc. Otherwise fail and give a useful
  12709. error message.
  12710. - Switch to a new buffer management algorithm, which tries to avoid
  12711. reallocing and copying quite as much. In first tests it looks like
  12712. it uses *more* memory on average, but less cpu.
  12713. - Switch our internal buffers implementation to use a ring buffer,
  12714. to hopefully improve performance for fast servers a lot.
  12715. - Reenable the part of the code that tries to flush as soon as an
  12716. OR outbuf has a full TLS record available. Perhaps this will make
  12717. OR outbufs not grow as huge except in rare cases, thus saving lots
  12718. of CPU time plus memory.
  12719. - Improve performance for dirservers: stop re-parsing the whole
  12720. directory every time you regenerate it.
  12721. - Keep a big splay tree of (circid,orconn)->circuit mappings to make
  12722. it much faster to look up a circuit for each relay cell.
  12723. - Remove most calls to assert_all_pending_dns_resolves_ok(),
  12724. since they're eating our cpu on exit nodes.
  12725. - Stop wasting time doing a case insensitive comparison for every
  12726. dns name every time we do any lookup. Canonicalize the names to
  12727. lowercase when you first see them.
  12728. o Hidden services:
  12729. - Handle unavailable hidden services better. Handle slow or busy
  12730. hidden services better.
  12731. - Cannibalize GENERAL circs to be C_REND, C_INTRO, S_INTRO, and S_REND
  12732. circ as necessary, if there are any completed ones lying around
  12733. when we try to launch one.
  12734. - Make hidden services try to establish a rendezvous for 30 seconds
  12735. after fetching the descriptor, rather than for n (where n=3)
  12736. attempts to build a circuit.
  12737. - Adjust maximum skew and age for rendezvous descriptors: let skew
  12738. be 48 hours rather than 90 minutes.
  12739. - Reject malformed .onion addresses rather then passing them on as
  12740. normal web requests.
  12741. o Controller:
  12742. - More Tor controller support. See
  12743. http://tor.eff.org/doc/control-spec.txt for all the new features,
  12744. including signals to emulate unix signals from any platform;
  12745. redirectstream; extendcircuit; mapaddress; getinfo; postdescriptor;
  12746. closestream; closecircuit; etc.
  12747. - Encode hashed controller passwords in hex instead of base64,
  12748. to make it easier to write controllers.
  12749. - Revise control spec and implementation to allow all log messages to
  12750. be sent to controller with their severities intact (suggested by
  12751. Matt Edman). Disable debug-level logs while delivering a debug-level
  12752. log to the controller, to prevent loop. Update TorControl to handle
  12753. new log event types.
  12754. o New config options/defaults:
  12755. - Begin scrubbing sensitive strings from logs by default. Turn off
  12756. the config option SafeLogging if you need to do debugging.
  12757. - New exit policy: accept most low-numbered ports, rather than
  12758. rejecting most low-numbered ports.
  12759. - Put a note in the torrc about abuse potential with the default
  12760. exit policy.
  12761. - Add support for CONNECTing through https proxies, with "HttpsProxy"
  12762. config option.
  12763. - Add HttpProxyAuthenticator and HttpsProxyAuthenticator support
  12764. based on patch from Adam Langley (basic auth only).
  12765. - Bump the default BandwidthRate from 1 MB to 2 MB, to accommodate
  12766. the fast servers that have been joining lately. (Clients are now
  12767. willing to load balance over up to 2 MB of advertised bandwidth
  12768. capacity too.)
  12769. - New config option MaxAdvertisedBandwidth which lets you advertise
  12770. a low bandwidthrate (to not attract as many circuits) while still
  12771. allowing a higher bandwidthrate in reality.
  12772. - Require BandwidthRate to be at least 20kB/s for servers.
  12773. - Add a NoPublish config option, so you can be a server (e.g. for
  12774. testing running Tor servers in other Tor networks) without
  12775. publishing your descriptor to the primary dirservers.
  12776. - Add a new AddressMap config directive to rewrite incoming socks
  12777. addresses. This lets you, for example, declare an implicit
  12778. required exit node for certain sites.
  12779. - Add a new TrackHostExits config directive to trigger addressmaps
  12780. for certain incoming socks addresses -- for sites that break when
  12781. your exit keeps changing (based on patch from Mike Perry).
  12782. - Split NewCircuitPeriod option into NewCircuitPeriod (30 secs),
  12783. which describes how often we retry making new circuits if current
  12784. ones are dirty, and MaxCircuitDirtiness (10 mins), which describes
  12785. how long we're willing to make use of an already-dirty circuit.
  12786. - Change compiled-in SHUTDOWN_WAIT_LENGTH from a fixed 30 secs to
  12787. a config option "ShutdownWaitLength" (when using kill -INT on
  12788. servers).
  12789. - Fix an edge case in parsing config options: if they say "--"
  12790. on the commandline, it's not a config option (thanks weasel).
  12791. - New config option DirAllowPrivateAddresses for authdirservers.
  12792. Now by default they refuse router descriptors that have non-IP or
  12793. private-IP addresses.
  12794. - Change DirFetchPeriod/StatusFetchPeriod to have a special "Be
  12795. smart" default value: low for servers and high for clients.
  12796. - Some people were putting "Address " in their torrc, and they had
  12797. a buggy resolver that resolved " " to 0.0.0.0. Oops.
  12798. - If DataDir is ~/.tor, and that expands to /.tor, then default to
  12799. LOCALSTATEDIR/tor instead.
  12800. - Implement --verify-config command-line option to check if your torrc
  12801. is valid without actually launching Tor.
  12802. o Logging improvements:
  12803. - When dirservers refuse a server descriptor, we now log its
  12804. contactinfo, platform, and the poster's IP address.
  12805. - Only warn once per nickname from add_nickname_list_to_smartlist()
  12806. per failure, so an entrynode or exitnode choice that's down won't
  12807. yell so much.
  12808. - When we're connecting to an OR and he's got a different nickname/key
  12809. than we were expecting, only complain loudly if we're an OP or a
  12810. dirserver. Complaining loudly to the OR admins just confuses them.
  12811. - Whine at you if you're a server and you don't set your contactinfo.
  12812. - Warn when exit policy implicitly allows local addresses.
  12813. - Give a better warning when some other server advertises an
  12814. ORPort that is actually an apache running ssl.
  12815. - If we get an incredibly skewed timestamp from a dirserver mirror
  12816. that isn't a verified OR, don't warn -- it's probably him that's
  12817. wrong.
  12818. - When a dirserver causes you to give a warn, mention which dirserver
  12819. it was.
  12820. - Initialize libevent later in the startup process, so the logs are
  12821. already established by the time we start logging libevent warns.
  12822. - Use correct errno on win32 if libevent fails.
  12823. - Check and warn about known-bad/slow libevent versions.
  12824. - Stop warning about sigpipes in the logs. We're going to
  12825. pretend that getting these occassionally is normal and fine.
  12826. o New contrib scripts:
  12827. - New experimental script tor/contrib/exitlist: a simple python
  12828. script to parse directories and find Tor nodes that exit to listed
  12829. addresses/ports.
  12830. - New experimental script tor/contrib/ExerciseServer.py (needs more
  12831. work) that uses the controller interface to build circuits and
  12832. fetch pages over them. This will help us bootstrap servers that
  12833. have lots of capacity but haven't noticed it yet.
  12834. - New experimental script tor/contrib/PathDemo.py (needs more work)
  12835. that uses the controller interface to let you choose whole paths
  12836. via addresses like
  12837. "<hostname>.<path,separated by dots>.<length of path>.path"
  12838. - New contributed script "privoxy-tor-toggle" to toggle whether
  12839. Privoxy uses Tor. Seems to be configured for Debian by default.
  12840. - Have torctl.in/tor.sh.in check for location of su binary (needed
  12841. on FreeBSD)
  12842. o Misc bugfixes:
  12843. - chdir() to your datadirectory at the *end* of the daemonize process,
  12844. not the beginning. This was a problem because the first time you
  12845. run tor, if your datadir isn't there, and you have runasdaemon set
  12846. to 1, it will try to chdir to it before it tries to create it. Oops.
  12847. - Fix several double-mark-for-close bugs, e.g. where we were finding
  12848. a conn for a cell even if that conn is already marked for close.
  12849. - Stop most cases of hanging up on a socks connection without sending
  12850. the socks reject.
  12851. - Fix a bug in the RPM package: set home directory for _tor to
  12852. something more reasonable when first installing.
  12853. - Stop putting nodename in the Platform string in server descriptors.
  12854. It doesn't actually help, and it is confusing/upsetting some people.
  12855. - When using preferred entry or exit nodes, ignore whether the
  12856. circuit wants uptime or capacity. They asked for the nodes, they
  12857. get the nodes.
  12858. - Tie MAX_DIR_SIZE to MAX_BUF_SIZE, so now directory sizes won't get
  12859. artificially capped at 500kB.
  12860. - Cache local dns resolves correctly even when they're .exit
  12861. addresses.
  12862. - If we're hibernating and we get a SIGINT, exit immediately.
  12863. - tor-resolve requests were ignoring .exit if there was a working circuit
  12864. they could use instead.
  12865. - Pay more attention to the ClientOnly config option.
  12866. - Resolve OS X installer bugs: stop claiming to be 0.0.9.2 in certain
  12867. installer screens; and don't put stuff into StartupItems unless
  12868. the user asks you to.
  12869. o Misc features:
  12870. - Rewrite address "serifos.exit" to "externalIP.serifos.exit"
  12871. rather than just rejecting it.
  12872. - If our clock jumps forward by 100 seconds or more, assume something
  12873. has gone wrong with our network and abandon all not-yet-used circs.
  12874. - When an application is using socks5, give him the whole variety of
  12875. potential socks5 responses (connect refused, host unreachable, etc),
  12876. rather than just "success" or "failure".
  12877. - A more sane version numbering system. See
  12878. http://tor.eff.org/cvs/tor/doc/version-spec.txt for details.
  12879. - Change version parsing logic: a version is "obsolete" if it is not
  12880. recommended and (1) there is a newer recommended version in the
  12881. same series, or (2) there are no recommended versions in the same
  12882. series, but there are some recommended versions in a newer series.
  12883. A version is "new" if it is newer than any recommended version in
  12884. the same series.
  12885. - Report HTTP reasons to client when getting a response from directory
  12886. servers -- so you can actually know what went wrong.
  12887. - Reject odd-looking addresses at the client (e.g. addresses that
  12888. contain a colon), rather than having the server drop them because
  12889. they're malformed.
  12890. - Stop publishing socksport in the directory, since it's not
  12891. actually meant to be public. For compatibility, publish a 0 there
  12892. for now.
  12893. - Since we ship our own Privoxy on OS X, tweak it so it doesn't write
  12894. cookies to disk and doesn't log each web request to disk. (Thanks
  12895. to Brett Carrington for pointing this out.)
  12896. - Add OSX uninstall instructions. An actual uninstall script will
  12897. come later.
  12898. - Add "opt hibernating 1" to server descriptor to make it clearer
  12899. whether the server is hibernating.
  12900. Changes in version 0.0.9.10 - 2005-06-16
  12901. o Bugfixes on 0.0.9.x (backported from 0.1.0.10):
  12902. - Refuse relay cells that claim to have a length larger than the
  12903. maximum allowed. This prevents a potential attack that could read
  12904. arbitrary memory (e.g. keys) from an exit server's process
  12905. (CVE-2005-2050).
  12906. Changes in version 0.0.9.9 - 2005-04-23
  12907. o Bugfixes on 0.0.9.x:
  12908. - If unofficial Tor clients connect and send weird TLS certs, our
  12909. Tor server triggers an assert. This release contains a minimal
  12910. backport from the broader fix that we put into 0.1.0.4-rc.
  12911. Changes in version 0.0.9.8 - 2005-04-07
  12912. o Bugfixes on 0.0.9.x:
  12913. - We have a bug that I haven't found yet. Sometimes, very rarely,
  12914. cpuworkers get stuck in the 'busy' state, even though the cpuworker
  12915. thinks of itself as idle. This meant that no new circuits ever got
  12916. established. Here's a workaround to kill any cpuworker that's been
  12917. busy for more than 100 seconds.
  12918. Changes in version 0.0.9.7 - 2005-04-01
  12919. o Bugfixes on 0.0.9.x:
  12920. - Fix another race crash bug (thanks to Glenn Fink for reporting).
  12921. - Compare identity to identity, not to nickname, when extending to
  12922. a router not already in the directory. This was preventing us from
  12923. extending to unknown routers. Oops.
  12924. - Make sure to create OS X Tor user in <500 range, so we aren't
  12925. creating actual system users.
  12926. - Note where connection-that-hasn't-sent-end was marked, and fix
  12927. a few really loud instances of this harmless bug (it's fixed more
  12928. in 0.1.0.x).
  12929. Changes in version 0.0.9.6 - 2005-03-24
  12930. o Bugfixes on 0.0.9.x (crashes and asserts):
  12931. - Add new end stream reasons to maintainance branch. Fix bug where
  12932. reason (8) could trigger an assert. Prevent bug from recurring.
  12933. - Apparently win32 stat wants paths to not end with a slash.
  12934. - Fix assert triggers in assert_cpath_layer_ok(), where we were
  12935. blowing away the circuit that conn->cpath_layer points to, then
  12936. checking to see if the circ is well-formed. Backport check to make
  12937. sure we dont use the cpath on a closed connection.
  12938. - Prevent circuit_resume_edge_reading_helper() from trying to package
  12939. inbufs for marked-for-close streams.
  12940. - Don't crash on hup if your options->address has become unresolvable.
  12941. - Some systems (like OS X) sometimes accept() a connection and tell
  12942. you the remote host is 0.0.0.0:0. If this happens, due to some
  12943. other mis-features, we get confused; so refuse the conn for now.
  12944. o Bugfixes on 0.0.9.x (other):
  12945. - Fix harmless but scary "Unrecognized content encoding" warn message.
  12946. - Add new stream error reason: TORPROTOCOL reason means "you are not
  12947. speaking a version of Tor I understand; say bye-bye to your stream."
  12948. - Be willing to cache directories from up to ROUTER_MAX_AGE seconds
  12949. into the future, now that we are more tolerant of skew. This
  12950. resolves a bug where a Tor server would refuse to cache a directory
  12951. because all the directories it gets are too far in the future;
  12952. yet the Tor server never logs any complaints about clock skew.
  12953. - Mac packaging magic: make man pages useable, and do not overwrite
  12954. existing torrc files.
  12955. - Make OS X log happily to /var/log/tor/tor.log
  12956. Changes in version 0.0.9.5 - 2005-02-22
  12957. o Bugfixes on 0.0.9.x:
  12958. - Fix an assert race at exit nodes when resolve requests fail.
  12959. - Stop picking unverified dir mirrors--it only leads to misery.
  12960. - Patch from Matt Edman to make NT services work better. Service
  12961. support is still not compiled into the executable by default.
  12962. - Patch from Dmitri Bely so the Tor service runs better under
  12963. the win32 SYSTEM account.
  12964. - Make tor-resolve actually work (?) on Win32.
  12965. - Fix a sign bug when getrlimit claims to have 4+ billion
  12966. file descriptors available.
  12967. - Stop refusing to start when bandwidthburst == bandwidthrate.
  12968. - When create cells have been on the onion queue more than five
  12969. seconds, just send back a destroy and take them off the list.
  12970. Changes in version 0.0.9.4 - 2005-02-03
  12971. o Bugfixes on 0.0.9:
  12972. - Fix an assert bug that took down most of our servers: when
  12973. a server claims to have 1 GB of bandwidthburst, don't
  12974. freak out.
  12975. - Don't crash as badly if we have spawned the max allowed number
  12976. of dnsworkers, or we're out of file descriptors.
  12977. - Block more file-sharing ports in the default exit policy.
  12978. - MaxConn is now automatically set to the hard limit of max
  12979. file descriptors we're allowed (ulimit -n), minus a few for
  12980. logs, etc.
  12981. - Give a clearer message when servers need to raise their
  12982. ulimit -n when they start running out of file descriptors.
  12983. - SGI Compatibility patches from Jan Schaumann.
  12984. - Tolerate a corrupt cached directory better.
  12985. - When a dirserver hasn't approved your server, list which one.
  12986. - Go into soft hibernation after 95% of the bandwidth is used,
  12987. not 99%. This is especially important for daily hibernators who
  12988. have a small accounting max. Hopefully it will result in fewer
  12989. cut connections when the hard hibernation starts.
  12990. - Load-balance better when using servers that claim more than
  12991. 800kB/s of capacity.
  12992. - Make NT services work (experimental, only used if compiled in).
  12993. Changes in version 0.0.9.3 - 2005-01-21
  12994. o Bugfixes on 0.0.9:
  12995. - Backport the cpu use fixes from main branch, so busy servers won't
  12996. need as much processor time.
  12997. - Work better when we go offline and then come back, or when we
  12998. run Tor at boot before the network is up. We do this by
  12999. optimistically trying to fetch a new directory whenever an
  13000. application request comes in and we think we're offline -- the
  13001. human is hopefully a good measure of when the network is back.
  13002. - Backport some minimal hidserv bugfixes: keep rend circuits open as
  13003. long as you keep using them; actually publish hidserv descriptors
  13004. shortly after they change, rather than waiting 20-40 minutes.
  13005. - Enable Mac startup script by default.
  13006. - Fix duplicate dns_cancel_pending_resolve reported by Giorgos Pallas.
  13007. - When you update AllowUnverifiedNodes or FirewallPorts via the
  13008. controller's setconf feature, we were always appending, never
  13009. resetting.
  13010. - When you update HiddenServiceDir via setconf, it was screwing up
  13011. the order of reading the lines, making it fail.
  13012. - Do not rewrite a cached directory back to the cache; otherwise we
  13013. will think it is recent and not fetch a newer one on startup.
  13014. - Workaround for webservers that lie about Content-Encoding: Tor
  13015. now tries to autodetect compressed directories and compression
  13016. itself. This lets us Proxypass dir fetches through apache.
  13017. Changes in version 0.0.9.2 - 2005-01-04
  13018. o Bugfixes on 0.0.9 (crashes and asserts):
  13019. - Fix an assert on startup when the disk is full and you're logging
  13020. to a file.
  13021. - If you do socks4 with an IP of 0.0.0.x but *don't* provide a socks4a
  13022. style address, then we'd crash.
  13023. - Fix an assert trigger when the running-routers string we get from
  13024. a dirserver is broken.
  13025. - Make worker threads start and run on win32. Now win32 servers
  13026. may work better.
  13027. - Bandaid (not actually fix, but now it doesn't crash) an assert
  13028. where the dns worker dies mysteriously and the main Tor process
  13029. doesn't remember anything about the address it was resolving.
  13030. o Bugfixes on 0.0.9 (Win32):
  13031. - Workaround for brain-damaged __FILE__ handling on MSVC: keep Nick's
  13032. name out of the warning/assert messages.
  13033. - Fix a superficial "unhandled error on read" bug on win32.
  13034. - The win32 installer no longer requires a click-through for our
  13035. license, since our Free Software license grants rights but does not
  13036. take any away.
  13037. - Win32: When connecting to a dirserver fails, try another one
  13038. immediately. (This was already working for non-win32 Tors.)
  13039. - Stop trying to parse $HOME on win32 when hunting for default
  13040. DataDirectory.
  13041. - Make tor-resolve.c work on win32 by calling network_init().
  13042. o Bugfixes on 0.0.9 (other):
  13043. - Make 0.0.9.x build on Solaris again.
  13044. - Due to a fencepost error, we were blowing away the \n when reporting
  13045. confvalue items in the controller. So asking for multiple config
  13046. values at once couldn't work.
  13047. - When listing circuits that are pending on an opening OR connection,
  13048. if we're an OR we were listing circuits that *end* at us as
  13049. being pending on every listener, dns/cpu worker, etc. Stop that.
  13050. - Dirservers were failing to create 'running-routers' or 'directory'
  13051. strings if we had more than some threshold of routers. Fix them so
  13052. they can handle any number of routers.
  13053. - Fix a superficial "Duplicate mark for close" bug.
  13054. - Stop checking for clock skew for OR connections, even for servers.
  13055. - Fix a fencepost error that was chopping off the last letter of any
  13056. nickname that is the maximum allowed nickname length.
  13057. - Update URLs in log messages so they point to the new website.
  13058. - Fix a potential problem in mangling server private keys while
  13059. writing to disk (not triggered yet, as far as we know).
  13060. - Include the licenses for other free software we include in Tor,
  13061. now that we're shipping binary distributions more regularly.
  13062. Changes in version 0.0.9.1 - 2004-12-15
  13063. o Bugfixes on 0.0.9:
  13064. - Make hibernation actually work.
  13065. - Make HashedControlPassword config option work.
  13066. - When we're reporting event circuit status to a controller,
  13067. don't use the stream status code.
  13068. Changes in version 0.0.9 - 2004-12-12
  13069. o Bugfixes on 0.0.8.1 (Crashes and asserts):
  13070. - Catch and ignore SIGXFSZ signals when log files exceed 2GB; our
  13071. write() call will fail and we handle it there.
  13072. - When we run out of disk space, or other log writing error, don't
  13073. crash. Just stop logging to that log and continue.
  13074. - Fix isspace() and friends so they still make Solaris happy
  13075. but also so they don't trigger asserts on win32.
  13076. - Fix assert failure on malformed socks4a requests.
  13077. - Fix an assert bug where a hidden service provider would fail if
  13078. the first hop of his rendezvous circuit was down.
  13079. - Better handling of size_t vs int, so we're more robust on 64
  13080. bit platforms.
  13081. o Bugfixes on 0.0.8.1 (Win32):
  13082. - Make windows sockets actually non-blocking (oops), and handle
  13083. win32 socket errors better.
  13084. - Fix parse_iso_time on platforms without strptime (eg win32).
  13085. - win32: when being multithreaded, leave parent fdarray open.
  13086. - Better handling of winsock includes on non-MSV win32 compilers.
  13087. - Change our file IO stuff (especially wrt OpenSSL) so win32 is
  13088. happier.
  13089. - Make unit tests work on win32.
  13090. o Bugfixes on 0.0.8.1 (Path selection and streams):
  13091. - Calculate timeout for waiting for a connected cell from the time
  13092. we sent the begin cell, not from the time the stream started. If
  13093. it took a long time to establish the circuit, we would time out
  13094. right after sending the begin cell.
  13095. - Fix router_compare_addr_to_addr_policy: it was not treating a port
  13096. of * as always matching, so we were picking reject *:* nodes as
  13097. exit nodes too. Oops.
  13098. - When read() failed on a stream, we would close it without sending
  13099. back an end. So 'connection refused' would simply be ignored and
  13100. the user would get no response.
  13101. - Stop a sigpipe: when an 'end' cell races with eof from the app,
  13102. we shouldn't hold-open-until-flush if the eof arrived first.
  13103. - Let resolve conns retry/expire also, rather than sticking around
  13104. forever.
  13105. - Fix more dns related bugs: send back resolve_failed and end cells
  13106. more reliably when the resolve fails, rather than closing the
  13107. circuit and then trying to send the cell. Also attach dummy resolve
  13108. connections to a circuit *before* calling dns_resolve(), to fix
  13109. a bug where cached answers would never be sent in RESOLVED cells.
  13110. o Bugfixes on 0.0.8.1 (Circuits):
  13111. - Finally fix a bug that's been plaguing us for a year:
  13112. With high load, circuit package window was reaching 0. Whenever
  13113. we got a circuit-level sendme, we were reading a lot on each
  13114. socket, but only writing out a bit. So we would eventually reach
  13115. eof. This would be noticed and acted on even when there were still
  13116. bytes sitting in the inbuf.
  13117. - Use identity comparison, not nickname comparison, to choose which
  13118. half of circuit-ID-space each side gets to use. This is needed
  13119. because sometimes we think of a router as a nickname, and sometimes
  13120. as a hex ID, and we can't predict what the other side will do.
  13121. o Bugfixes on 0.0.8.1 (Other):
  13122. - Fix a whole slew of memory leaks.
  13123. - Disallow NDEBUG. We don't ever want anybody to turn off debug.
  13124. - If we are using select, make sure we stay within FD_SETSIZE.
  13125. - When poll() is interrupted, we shouldn't believe the revents values.
  13126. - Add a FAST_SMARTLIST define to optionally inline smartlist_get
  13127. and smartlist_len, which are two major profiling offenders.
  13128. - If do_hup fails, actually notice.
  13129. - Flush the log file descriptor after we print "Tor opening log file",
  13130. so we don't see those messages days later.
  13131. - Hidden service operators now correctly handle version 1 style
  13132. INTRODUCE1 cells (nobody generates them still, so not a critical
  13133. bug).
  13134. - Handle more errnos from accept() without closing the listener.
  13135. Some OpenBSD machines were closing their listeners because
  13136. they ran out of file descriptors.
  13137. - Some people had wrapped their tor client/server in a script
  13138. that would restart it whenever it died. This did not play well
  13139. with our "shut down if your version is obsolete" code. Now people
  13140. don't fetch a new directory if their local cached version is
  13141. recent enough.
  13142. - Make our autogen.sh work on ksh as well as bash.
  13143. - Better torrc example lines for dirbindaddress and orbindaddress.
  13144. - Improved bounds checking on parsed ints (e.g. config options and
  13145. the ones we find in directories.)
  13146. - Stop using separate defaults for no-config-file and
  13147. empty-config-file. Now you have to explicitly turn off SocksPort,
  13148. if you don't want it open.
  13149. - We were starting to daemonize before we opened our logs, so if
  13150. there were any problems opening logs, we would complain to stderr,
  13151. which wouldn't work, and then mysteriously exit.
  13152. - If a verified OR connects to us before he's uploaded his descriptor,
  13153. or we verify him and hup but he still has the original TLS
  13154. connection, then conn->nickname is still set like he's unverified.
  13155. o Code security improvements, inspired by Ilja:
  13156. - tor_snprintf wrapper over snprintf with consistent (though not C99)
  13157. overflow behavior.
  13158. - Replace sprintf with tor_snprintf. (I think they were all safe, but
  13159. hey.)
  13160. - Replace strcpy/strncpy with strlcpy in more places.
  13161. - Avoid strcat; use tor_snprintf or strlcat instead.
  13162. o Features (circuits and streams):
  13163. - New circuit building strategy: keep a list of ports that we've
  13164. used in the past 6 hours, and always try to have 2 circuits open
  13165. or on the way that will handle each such port. Seed us with port
  13166. 80 so web users won't complain that Tor is "slow to start up".
  13167. - Make kill -USR1 dump more useful stats about circuits.
  13168. - When warning about retrying or giving up, print the address, so
  13169. the user knows which one it's talking about.
  13170. - If you haven't used a clean circuit in an hour, throw it away,
  13171. just to be on the safe side. (This means after 6 hours a totally
  13172. unused Tor client will have no circuits open.)
  13173. - Support "foo.nickname.exit" addresses, to let Alice request the
  13174. address "foo" as viewed by exit node "nickname". Based on a patch
  13175. from Geoff Goodell.
  13176. - If your requested entry or exit node has advertised bandwidth 0,
  13177. pick it anyway.
  13178. - Be more greedy about filling up relay cells -- we try reading again
  13179. once we've processed the stuff we read, in case enough has arrived
  13180. to fill the last cell completely.
  13181. - Refuse application socks connections to port 0.
  13182. - Use only 0.0.9pre1 and later servers for resolve cells.
  13183. o Features (bandwidth):
  13184. - Hibernation: New config option "AccountingMax" lets you
  13185. set how many bytes per month (in each direction) you want to
  13186. allow your server to consume. Rather than spreading those
  13187. bytes out evenly over the month, we instead hibernate for some
  13188. of the month and pop up at a deterministic time, work until
  13189. the bytes are consumed, then hibernate again. Config option
  13190. "MonthlyAccountingStart" lets you specify which day of the month
  13191. your billing cycle starts on.
  13192. - Implement weekly/monthly/daily accounting: now you specify your
  13193. hibernation properties by
  13194. AccountingMax N bytes|KB|MB|GB|TB
  13195. AccountingStart day|week|month [day] HH:MM
  13196. Defaults to "month 1 0:00".
  13197. - Let bandwidth and interval config options be specified as 5 bytes,
  13198. kb, kilobytes, etc; and as seconds, minutes, hours, days, weeks.
  13199. o Features (directories):
  13200. - New "router-status" line in directory, to better bind each verified
  13201. nickname to its identity key.
  13202. - Clients can ask dirservers for /dir.z to get a compressed version
  13203. of the directory. Only works for servers running 0.0.9, of course.
  13204. - Make clients cache directories and use them to seed their router
  13205. lists at startup. This means clients have a datadir again.
  13206. - Respond to content-encoding headers by trying to uncompress as
  13207. appropriate.
  13208. - Clients and servers now fetch running-routers; cache
  13209. running-routers; compress running-routers; serve compressed
  13210. running-routers.z
  13211. - Make moria2 advertise a dirport of 80, so people behind firewalls
  13212. will be able to get a directory.
  13213. - Http proxy support
  13214. - Dirservers translate requests for http://%s:%d/x to /x
  13215. - You can specify "HttpProxy %s[:%d]" and all dir fetches will
  13216. be routed through this host.
  13217. - Clients ask for /tor/x rather than /x for new enough dirservers.
  13218. This way we can one day coexist peacefully with apache.
  13219. - Clients specify a "Host: %s%d" http header, to be compatible
  13220. with more proxies, and so running squid on an exit node can work.
  13221. - Protect dirservers from overzealous descriptor uploading -- wait
  13222. 10 seconds after directory gets dirty, before regenerating.
  13223. o Features (packages and install):
  13224. - Add NSI installer contributed by J Doe.
  13225. - Apply NT service patch from Osamu Fujino. Still needs more work.
  13226. - Commit VC6 and VC7 workspace/project files.
  13227. - Commit a tor.spec for making RPM files, with help from jbash.
  13228. - Add contrib/torctl.in contributed by Glenn Fink.
  13229. - Make expand_filename handle ~ and ~username.
  13230. - Use autoconf to enable largefile support where necessary. Use
  13231. ftello where available, since ftell can fail at 2GB.
  13232. - Ship src/win32/ in the tarball, so people can use it to build.
  13233. - Make old win32 fall back to CWD if SHGetSpecialFolderLocation
  13234. is broken.
  13235. o Features (ui controller):
  13236. - Control interface: a separate program can now talk to your
  13237. client/server over a socket, and get/set config options, receive
  13238. notifications of circuits and streams starting/finishing/dying,
  13239. bandwidth used, etc. The next step is to get some GUIs working.
  13240. Let us know if you want to help out. See doc/control-spec.txt .
  13241. - Ship a contrib/tor-control.py as an example script to interact
  13242. with the control port.
  13243. - "tor --hash-password zzyxz" will output a salted password for
  13244. use in authenticating to the control interface.
  13245. - Implement the control-spec's SAVECONF command, to write your
  13246. configuration to torrc.
  13247. - Get cookie authentication for the controller closer to working.
  13248. - When set_conf changes our server descriptor, upload a new copy.
  13249. But don't upload it too often if there are frequent changes.
  13250. o Features (config and command-line):
  13251. - Deprecate unofficial config option abbreviations, and abbreviations
  13252. not on the command line.
  13253. - Configuration infrastructure support for warning on obsolete
  13254. options.
  13255. - Give a slightly more useful output for "tor -h".
  13256. - Break DirFetchPostPeriod into:
  13257. - DirFetchPeriod for fetching full directory,
  13258. - StatusFetchPeriod for fetching running-routers,
  13259. - DirPostPeriod for posting server descriptor,
  13260. - RendPostPeriod for posting hidden service descriptors.
  13261. - New log format in config:
  13262. "Log minsev[-maxsev] stdout|stderr|syslog" or
  13263. "Log minsev[-maxsev] file /var/foo"
  13264. - DirPolicy config option, to let people reject incoming addresses
  13265. from their dirserver.
  13266. - "tor --list-fingerprint" will list your identity key fingerprint
  13267. and then exit.
  13268. - Make tor --version --version dump the cvs Id of every file.
  13269. - New 'MyFamily nick1,...' config option for a server to
  13270. specify other servers that shouldn't be used in the same circuit
  13271. with it. Only believed if nick1 also specifies us.
  13272. - New 'NodeFamily nick1,nick2,...' config option for a client to
  13273. specify nodes that it doesn't want to use in the same circuit.
  13274. - New 'Redirectexit pattern address:port' config option for a
  13275. server to redirect exit connections, e.g. to a local squid.
  13276. - Add "pass" target for RedirectExit, to make it easier to break
  13277. out of a sequence of RedirectExit rules.
  13278. - Make the dirservers file obsolete.
  13279. - Include a dir-signing-key token in directories to tell the
  13280. parsing entity which key is being used to sign.
  13281. - Remove the built-in bulky default dirservers string.
  13282. - New config option "Dirserver %s:%d [fingerprint]", which can be
  13283. repeated as many times as needed. If no dirservers specified,
  13284. default to moria1,moria2,tor26.
  13285. - Make 'Routerfile' config option obsolete.
  13286. - Discourage people from setting their dirfetchpostperiod more often
  13287. than once per minute.
  13288. o Features (other):
  13289. - kill -USR2 now moves all logs to loglevel debug (kill -HUP to
  13290. get back to normal.)
  13291. - Accept *:706 (silc) in default exit policy.
  13292. - Implement new versioning format for post 0.1.
  13293. - Distinguish between TOR_TLS_CLOSE and TOR_TLS_ERROR, so we can
  13294. log more informatively.
  13295. - Check clock skew for verified servers, but allow unverified
  13296. servers and clients to have any clock skew.
  13297. - Make sure the hidden service descriptors are at a random offset
  13298. from each other, to hinder linkability.
  13299. - Clients now generate a TLS cert too, in preparation for having
  13300. them act more like real nodes.
  13301. - Add a pure-C tor-resolve implementation.
  13302. - Use getrlimit and friends to ensure we can reach MaxConn (currently
  13303. 1024) file descriptors.
  13304. - Raise the max dns workers from 50 to 100.
  13305. Changes in version 0.0.8.1 - 2004-10-13
  13306. o Bugfixes:
  13307. - Fix a seg fault that can be triggered remotely for Tor
  13308. clients/servers with an open dirport.
  13309. - Fix a rare assert trigger, where routerinfos for entries in
  13310. our cpath would expire while we're building the path.
  13311. - Fix a bug in OutboundBindAddress so it (hopefully) works.
  13312. - Fix a rare seg fault for people running hidden services on
  13313. intermittent connections.
  13314. - Fix a bug in parsing opt keywords with objects.
  13315. - Fix a stale pointer assert bug when a stream detaches and
  13316. reattaches.
  13317. - Fix a string format vulnerability (probably not exploitable)
  13318. in reporting stats locally.
  13319. - Fix an assert trigger: sometimes launching circuits can fail
  13320. immediately, e.g. because too many circuits have failed recently.
  13321. - Fix a compile warning on 64 bit platforms.
  13322. Changes in version 0.0.8 - 2004-08-25
  13323. o Bugfixes:
  13324. - Made our unit tests compile again on OpenBSD 3.5, and tor
  13325. itself compile again on OpenBSD on a sparc64.
  13326. - We were neglecting milliseconds when logging on win32, so
  13327. everything appeared to happen at the beginning of each second.
  13328. - Check directory signature _before_ you decide whether you're
  13329. you're running an obsolete version and should exit.
  13330. - Check directory signature _before_ you parse the running-routers
  13331. list to decide who's running.
  13332. - Check return value of fclose while writing to disk, so we don't
  13333. end up with broken files when servers run out of disk space.
  13334. - Port it to SunOS 5.9 / Athena
  13335. - Fix two bugs in saving onion keys to disk when rotating, so
  13336. hopefully we'll get fewer people using old onion keys.
  13337. - Remove our mostly unused -- and broken -- hex_encode()
  13338. function. Use base16_encode() instead. (Thanks to Timo Lindfors
  13339. for pointing out this bug.)
  13340. - Only pick and establish intro points after we've gotten a
  13341. directory.
  13342. - Fix assert triggers: if the other side returns an address 0.0.0.0,
  13343. don't put it into the client dns cache.
  13344. - If a begin failed due to exit policy, but we believe the IP
  13345. address should have been allowed, switch that router to exitpolicy
  13346. reject *:* until we get our next directory.
  13347. o Protocol changes:
  13348. - 'Extend' relay cell payloads now include the digest of the
  13349. intended next hop's identity key. Now we can verify that we're
  13350. extending to the right router, and also extend to routers we
  13351. hadn't heard of before.
  13352. o Features:
  13353. - Tor nodes can now act as relays (with an advertised ORPort)
  13354. without being manually verified by the dirserver operators.
  13355. - Uploaded descriptors of unverified routers are now accepted
  13356. by the dirservers, and included in the directory.
  13357. - Verified routers are listed by nickname in the running-routers
  13358. list; unverified routers are listed as "$<fingerprint>".
  13359. - We now use hash-of-identity-key in most places rather than
  13360. nickname or addr:port, for improved security/flexibility.
  13361. - AllowUnverifiedNodes config option to let circuits choose no-name
  13362. routers in entry,middle,exit,introduction,rendezvous positions.
  13363. Allow middle and rendezvous positions by default.
  13364. - When picking unverified routers, skip those with low uptime and/or
  13365. low bandwidth, depending on what properties you care about.
  13366. - ClientOnly option for nodes that never want to become servers.
  13367. - Directory caching.
  13368. - "AuthoritativeDir 1" option for the official dirservers.
  13369. - Now other nodes (clients and servers) will cache the latest
  13370. directory they've pulled down.
  13371. - They can enable their DirPort to serve it to others.
  13372. - Clients will pull down a directory from any node with an open
  13373. DirPort, and check the signature/timestamp correctly.
  13374. - Authoritative dirservers now fetch directories from other
  13375. authdirservers, to stay better synced.
  13376. - Running-routers list tells who's down also, along with noting
  13377. if they're verified (listed by nickname) or unverified (listed
  13378. by hash-of-key).
  13379. - Allow dirservers to serve running-router list separately.
  13380. This isn't used yet.
  13381. - You can now fetch $DIRURL/running-routers to get just the
  13382. running-routers line, not the whole descriptor list. (But
  13383. clients don't use this yet.)
  13384. - Clients choose nodes proportional to advertised bandwidth.
  13385. - Clients avoid using nodes with low uptime as introduction points.
  13386. - Handle servers with dynamic IP addresses: don't just replace
  13387. options->Address with the resolved one at startup, and
  13388. detect our address right before we make a routerinfo each time.
  13389. - 'FascistFirewall' option to pick dirservers and ORs on specific
  13390. ports; plus 'FirewallPorts' config option to tell FascistFirewall
  13391. which ports are open. (Defaults to 80,443)
  13392. - Try other dirservers immediately if the one you try is down. This
  13393. should tolerate down dirservers better now.
  13394. - ORs connect-on-demand to other ORs
  13395. - If you get an extend cell to an OR you're not connected to,
  13396. connect, handshake, and forward the create cell.
  13397. - The authoritative dirservers stay connected to everybody,
  13398. and everybody stays connected to 0.0.7 servers, but otherwise
  13399. clients/servers expire unused connections after 5 minutes.
  13400. - When servers get a sigint, they delay 30 seconds (refusing new
  13401. connections) then exit. A second sigint causes immediate exit.
  13402. - File and name management:
  13403. - Look for .torrc if no CONFDIR "torrc" is found.
  13404. - If no datadir is defined, then choose, make, and secure ~/.tor
  13405. as datadir.
  13406. - If torrc not found, exitpolicy reject *:*.
  13407. - Expands ~/ in filenames to $HOME/ (but doesn't yet expand ~arma).
  13408. - If no nickname is defined, derive default from hostname.
  13409. - Rename secret key files, e.g. identity.key -> secret_id_key,
  13410. to discourage people from mailing their identity key to tor-ops.
  13411. - Refuse to build a circuit before the directory has arrived --
  13412. it won't work anyway, since you won't know the right onion keys
  13413. to use.
  13414. - Parse tor version numbers so we can do an is-newer-than check
  13415. rather than an is-in-the-list check.
  13416. - New socks command 'resolve', to let us shim gethostbyname()
  13417. locally.
  13418. - A 'tor_resolve' script to access the socks resolve functionality.
  13419. - A new socks-extensions.txt doc file to describe our
  13420. interpretation and extensions to the socks protocols.
  13421. - Add a ContactInfo option, which gets published in descriptor.
  13422. - Write tor version at the top of each log file
  13423. - New docs in the tarball:
  13424. - tor-doc.html.
  13425. - Document that you should proxy your SSL traffic too.
  13426. - Log a warning if the user uses an unsafe socks variant, so people
  13427. are more likely to learn about privoxy or socat.
  13428. - Log a warning if you're running an unverified server, to let you
  13429. know you might want to get it verified.
  13430. - Change the default exit policy to reject the default edonkey,
  13431. kazaa, gnutella ports.
  13432. - Add replace_file() to util.[ch] to handle win32's rename().
  13433. - Publish OR uptime in descriptor (and thus in directory) too.
  13434. - Remember used bandwidth (both in and out), and publish 15-minute
  13435. snapshots for the past day into our descriptor.
  13436. - Be more aggressive about trying to make circuits when the network
  13437. has changed (e.g. when you unsuspend your laptop).
  13438. - Check for time skew on http headers; report date in response to
  13439. "GET /".
  13440. - If the entrynode config line has only one node, don't pick it as
  13441. an exitnode.
  13442. - Add strict{entry|exit}nodes config options. If set to 1, then
  13443. we refuse to build circuits that don't include the specified entry
  13444. or exit nodes.
  13445. - OutboundBindAddress config option, to bind to a specific
  13446. IP address for outgoing connect()s.
  13447. - End truncated log entries (e.g. directories) with "[truncated]".
  13448. Changes in version 0.0.7.3 - 2004-08-12
  13449. o Stop dnsworkers from triggering an assert failure when you
  13450. ask them to resolve the host "".
  13451. Changes in version 0.0.7.2 - 2004-07-07
  13452. o A better fix for the 0.0.0.0 problem, that will hopefully
  13453. eliminate the remaining related assertion failures.
  13454. Changes in version 0.0.7.1 - 2004-07-04
  13455. o When an address resolves to 0.0.0.0, treat it as a failed resolve,
  13456. since internally we use 0.0.0.0 to signify "not yet resolved".
  13457. Changes in version 0.0.7 - 2004-06-07
  13458. o Fixes for crashes and other obnoxious bugs:
  13459. - Fix an epipe bug: sometimes when directory connections failed
  13460. to connect, we would give them a chance to flush before closing
  13461. them.
  13462. - When we detached from a circuit because of resolvefailed, we
  13463. would immediately try the same circuit twice more, and then
  13464. give up on the resolve thinking we'd tried three different
  13465. exit nodes.
  13466. - Limit the number of intro circuits we'll attempt to build for a
  13467. hidden service per 15-minute period.
  13468. - Check recommended-software string *early*, before actually parsing
  13469. the directory. Thus we can detect an obsolete version and exit,
  13470. even if the new directory format doesn't parse.
  13471. o Fixes for security bugs:
  13472. - Remember which nodes are dirservers when you startup, and if a
  13473. random OR enables his dirport, don't automatically assume he's
  13474. a trusted dirserver.
  13475. o Other bugfixes:
  13476. - Directory connections were asking the wrong poll socket to
  13477. start writing, and not asking themselves to start writing.
  13478. - When we detached from a circuit because we sent a begin but
  13479. didn't get a connected, we would use it again the first time;
  13480. but after that we would correctly switch to a different one.
  13481. - Stop warning when the first onion decrypt attempt fails; they
  13482. will sometimes legitimately fail now that we rotate keys.
  13483. - Override unaligned-access-ok check when $host_cpu is ia64 or
  13484. arm. Apparently they allow it but the kernel whines.
  13485. - Dirservers try to reconnect periodically too, in case connections
  13486. have failed.
  13487. - Fix some memory leaks in directory servers.
  13488. - Allow backslash in Win32 filenames.
  13489. - Made Tor build complain-free on FreeBSD, hopefully without
  13490. breaking other BSD builds. We'll see.
  13491. - Check directory signatures based on name of signer, not on whom
  13492. we got the directory from. This will let us cache directories more
  13493. easily.
  13494. - Rotate dnsworkers and cpuworkers on SIGHUP, so they get new config
  13495. settings too.
  13496. o Features:
  13497. - Doxygen markup on all functions and global variables.
  13498. - Make directory functions update routerlist, not replace it. So
  13499. now directory disagreements are not so critical a problem.
  13500. - Remove the upper limit on number of descriptors in a dirserver's
  13501. directory (not that we were anywhere close).
  13502. - Allow multiple logfiles at different severity ranges.
  13503. - Allow *BindAddress to specify ":port" rather than setting *Port
  13504. separately. Allow multiple instances of each BindAddress config
  13505. option, so you can bind to multiple interfaces if you want.
  13506. - Allow multiple exit policy lines, which are processed in order.
  13507. Now we don't need that huge line with all the commas in it.
  13508. - Enable accept/reject policies on SOCKS connections, so you can bind
  13509. to 0.0.0.0 but still control who can use your OP.
  13510. - Updated the man page to reflect these features.
  13511. Changes in version 0.0.6.2 - 2004-05-16
  13512. o Our integrity-checking digest was checking only the most recent cell,
  13513. not the previous cells like we'd thought.
  13514. Thanks to Stefan Mark for finding the flaw!
  13515. Changes in version 0.0.6.1 - 2004-05-06
  13516. o Fix two bugs in our AES counter-mode implementation (this affected
  13517. onion-level stream encryption, but not TLS-level). It turns
  13518. out we were doing something much more akin to a 16-character
  13519. polyalphabetic cipher. Oops.
  13520. Thanks to Stefan Mark for finding the flaw!
  13521. o Retire moria3 as a directory server, and add tor26 as a directory
  13522. server.
  13523. Changes in version 0.0.6 - 2004-05-02
  13524. o Features:
  13525. - Hidden services and rendezvous points are implemented. Go to
  13526. http://6sxoyfb3h2nvok2d.onion/ for an index of currently available
  13527. hidden services. (This only works via a socks4a proxy such as
  13528. Privoxy, and currently it's quite slow.)
  13529. - We now rotate link (tls context) keys and onion keys.
  13530. - CREATE cells now include oaep padding, so you can tell
  13531. if you decrypted them correctly.
  13532. - Retry stream correctly when we fail to connect because of
  13533. exit-policy-reject (should try another) or can't-resolve-address.
  13534. - When we hup a dirserver and we've *removed* a server from the
  13535. approved-routers list, now we remove that server from the
  13536. in-memory directories too.
  13537. - Add bandwidthburst to server descriptor.
  13538. - Directories now say which dirserver signed them.
  13539. - Use a tor_assert macro that logs failed assertions too.
  13540. - Since we don't support truncateds much, don't bother sending them;
  13541. just close the circ.
  13542. - Fetch randomness from /dev/urandom better (not via fopen/fread)
  13543. - Better debugging for tls errors
  13544. - Set Content-Type on the directory and hidserv descriptor.
  13545. - Remove IVs from cipher code, since AES-ctr has none.
  13546. o Bugfixes:
  13547. - Fix an assert trigger for exit nodes that's been plaguing us since
  13548. the days of 0.0.2prexx (thanks weasel!)
  13549. - Fix a bug where we were closing tls connections intermittently.
  13550. It turns out openssl keeps its errors around -- so if an error
  13551. happens, and you don't ask about it, and then another openssl
  13552. operation happens and succeeds, and you ask if there was an error,
  13553. it tells you about the first error.
  13554. - Fix a bug that's been lurking since 27 may 03 (!)
  13555. When passing back a destroy cell, we would use the wrong circ id.
  13556. - Don't crash if a conn that sent a begin has suddenly lost its circuit.
  13557. - Some versions of openssl have an SSL_pending function that erroneously
  13558. returns bytes when there is a non-application record pending.
  13559. - Win32 fixes. Tor now compiles on win32 with no warnings/errors.
  13560. o We were using an array of length zero in a few places.
  13561. o Win32's gethostbyname can't resolve an IP to an IP.
  13562. o Win32's close can't close a socket.
  13563. o Handle windows socket errors correctly.
  13564. o Portability:
  13565. - check for <sys/limits.h> so we build on FreeBSD again, and
  13566. <machine/limits.h> for NetBSD.
  13567. Changes in version 0.0.5 - 2004-03-30
  13568. o Install torrc as torrc.sample -- we no longer clobber your
  13569. torrc. (Woo!)
  13570. o Fix mangled-state bug in directory fetching (was causing sigpipes).
  13571. o Only build circuits after we've fetched the directory: clients were
  13572. using only the directory servers before they'd fetched a directory.
  13573. This also means longer startup time; so it goes.
  13574. o Fix an assert trigger where an OP would fail to handshake, and we'd
  13575. expect it to have a nickname.
  13576. o Work around a tsocks bug: do a socks reject when AP connection dies
  13577. early, else tsocks goes into an infinite loop.
  13578. o Hold socks connection open until reply is flushed (if possible)
  13579. o Make exit nodes resolve IPs to IPs immediately, rather than asking
  13580. the dns farm to do it.
  13581. o Fix c99 aliasing warnings in rephist.c
  13582. o Don't include server descriptors that are older than 24 hours in the
  13583. directory.
  13584. o Give socks 'reject' replies their whole 15s to attempt to flush,
  13585. rather than seeing the 60s timeout and assuming the flush had failed.
  13586. o Clean automake droppings from the cvs repository
  13587. o Add in a 'notice' log level for things the operator should hear
  13588. but that aren't warnings
  13589. Changes in version 0.0.4 - 2004-03-26
  13590. o When connecting to a dirserver or OR and the network is down,
  13591. we would crash.
  13592. Changes in version 0.0.3 - 2004-03-26
  13593. o Warn and fail if server chose a nickname with illegal characters
  13594. o Port to Solaris and Sparc:
  13595. - include missing header fcntl.h
  13596. - have autoconf find -lsocket -lnsl automatically
  13597. - deal with hardware word alignment
  13598. - make uname() work (solaris has a different return convention)
  13599. - switch from using signal() to sigaction()
  13600. o Preliminary work on reputation system:
  13601. - Keep statistics on success/fail of connect attempts; they're published
  13602. by kill -USR1 currently.
  13603. - Add a RunTesting option to try to learn link state by creating test
  13604. circuits, even when SocksPort is off.
  13605. - Remove unused open circuits when there are too many.
  13606. Changes in version 0.0.2 - 2004-03-19
  13607. - Include strlcpy and strlcat for safer string ops
  13608. - define INADDR_NONE so we compile (but still not run) on solaris
  13609. Changes in version 0.0.2pre27 - 2004-03-14
  13610. o Bugfixes:
  13611. - Allow internal tor networks (we were rejecting internal IPs,
  13612. now we allow them if they're set explicitly).
  13613. - And fix a few endian issues.
  13614. Changes in version 0.0.2pre26 - 2004-03-14
  13615. o New features:
  13616. - If a stream times out after 15s without a connected cell, don't
  13617. try that circuit again: try a new one.
  13618. - Retry streams at most 4 times. Then give up.
  13619. - When a dirserver gets a descriptor from an unknown router, it
  13620. logs its fingerprint (so the dirserver operator can choose to
  13621. accept it even without mail from the server operator).
  13622. - Inform unapproved servers when we reject their descriptors.
  13623. - Make tor build on Windows again. It works as a client, who knows
  13624. about as a server.
  13625. - Clearer instructions in the torrc for how to set up a server.
  13626. - Be more efficient about reading fd's when our global token bucket
  13627. (used for rate limiting) becomes empty.
  13628. o Bugfixes:
  13629. - Stop asserting that computers always go forward in time. It's
  13630. simply not true.
  13631. - When we sent a cell (e.g. destroy) and then marked an OR connection
  13632. expired, we might close it before finishing a flush if the other
  13633. side isn't reading right then.
  13634. - Don't allow dirservers to start if they haven't defined
  13635. RecommendedVersions
  13636. - We were caching transient dns failures. Oops.
  13637. - Prevent servers from publishing an internal IP as their address.
  13638. - Address a strcat vulnerability in circuit.c
  13639. Changes in version 0.0.2pre25 - 2004-03-04
  13640. o New features:
  13641. - Put the OR's IP in its router descriptor, not its fqdn. That way
  13642. we'll stop being stalled by gethostbyname for nodes with flaky dns,
  13643. e.g. poblano.
  13644. o Bugfixes:
  13645. - If the user typed in an address that didn't resolve, the server
  13646. crashed.
  13647. Changes in version 0.0.2pre24 - 2004-03-03
  13648. o Bugfixes:
  13649. - Fix an assertion failure in dns.c, where we were trying to dequeue
  13650. a pending dns resolve even if it wasn't pending
  13651. - Fix a spurious socks5 warning about still trying to write after the
  13652. connection is finished.
  13653. - Hold certain marked_for_close connections open until they're finished
  13654. flushing, rather than losing bytes by closing them too early.
  13655. - Correctly report the reason for ending a stream
  13656. - Remove some duplicate calls to connection_mark_for_close
  13657. - Put switch_id and start_daemon earlier in the boot sequence, so it
  13658. will actually try to chdir() to options.DataDirectory
  13659. - Make 'make test' exit(1) if a test fails; fix some unit tests
  13660. - Make tor fail when you use a config option it doesn't know about,
  13661. rather than warn and continue.
  13662. - Make --version work
  13663. - Bugfixes on the rpm spec file and tor.sh, so it's more up to date
  13664. Changes in version 0.0.2pre23 - 2004-02-29
  13665. o New features:
  13666. - Print a statement when the first circ is finished, so the user
  13667. knows it's working.
  13668. - If a relay cell is unrecognized at the end of the circuit,
  13669. send back a destroy. (So attacks to mutate cells are more
  13670. clearly thwarted.)
  13671. - New config option 'excludenodes' to avoid certain nodes for circuits.
  13672. - When it daemonizes, it chdir's to the DataDirectory rather than "/",
  13673. so you can collect coredumps there.
  13674. o Bugfixes:
  13675. - Fix a bug in tls flushing where sometimes data got wedged and
  13676. didn't flush until more data got sent. Hopefully this bug was
  13677. a big factor in the random delays we were seeing.
  13678. - Make 'connected' cells include the resolved IP, so the client
  13679. dns cache actually gets populated.
  13680. - Disallow changing from ORPort=0 to ORPort>0 on hup.
  13681. - When we time-out on a stream and detach from the circuit, send an
  13682. end cell down it first.
  13683. - Only warn about an unknown router (in exitnodes, entrynodes,
  13684. excludenodes) after we've fetched a directory.
  13685. Changes in version 0.0.2pre22 - 2004-02-26
  13686. o New features:
  13687. - Servers publish less revealing uname information in descriptors.
  13688. - More memory tracking and assertions, to crash more usefully when
  13689. errors happen.
  13690. - If the default torrc isn't there, just use some default defaults.
  13691. Plus provide an internal dirservers file if they don't have one.
  13692. - When the user tries to use Tor as an http proxy, give them an http
  13693. 501 failure explaining that we're a socks proxy.
  13694. - Dump a new router.desc on hup, to help confused people who change
  13695. their exit policies and then wonder why router.desc doesn't reflect
  13696. it.
  13697. - Clean up the generic tor.sh init script that we ship with.
  13698. o Bugfixes:
  13699. - If the exit stream is pending on the resolve, and a destroy arrives,
  13700. then the stream wasn't getting removed from the pending list. I
  13701. think this was the one causing recent server crashes.
  13702. - Use a more robust poll on OSX 10.3, since their poll is flaky.
  13703. - When it couldn't resolve any dirservers, it was useless from then on.
  13704. Now it reloads the RouterFile (or default dirservers) if it has no
  13705. dirservers.
  13706. - Move the 'tor' binary back to /usr/local/bin/ -- it turns out
  13707. many users don't even *have* a /usr/local/sbin/.
  13708. Changes in version 0.0.2pre21 - 2004-02-18
  13709. o New features:
  13710. - There's a ChangeLog file that actually reflects the changelog.
  13711. - There's a 'torify' wrapper script, with an accompanying
  13712. tor-tsocks.conf, that simplifies the process of using tsocks for
  13713. tor. It even has a man page.
  13714. - The tor binary gets installed to sbin rather than bin now.
  13715. - Retry streams where the connected cell hasn't arrived in 15 seconds
  13716. - Clean up exit policy handling -- get the default out of the torrc,
  13717. so we can update it without forcing each server operator to fix
  13718. his/her torrc.
  13719. - Allow imaps and pop3s in default exit policy
  13720. o Bugfixes:
  13721. - Prevent picking middleman nodes as the last node in the circuit
  13722. Changes in version 0.0.2pre20 - 2004-01-30
  13723. o New features:
  13724. - We now have a deb package, and it's in debian unstable. Go to
  13725. it, apt-getters. :)
  13726. - I've split the TotalBandwidth option into BandwidthRate (how many
  13727. bytes per second you want to allow, long-term) and
  13728. BandwidthBurst (how many bytes you will allow at once before the cap
  13729. kicks in). This better token bucket approach lets you, say, set
  13730. BandwidthRate to 10KB/s and BandwidthBurst to 10MB, allowing good
  13731. performance while not exceeding your monthly bandwidth quota.
  13732. - Push out a tls record's worth of data once you've got it, rather
  13733. than waiting until you've read everything waiting to be read. This
  13734. may improve performance by pipelining better. We'll see.
  13735. - Add an AP_CONN_STATE_CONNECTING state, to allow streams to detach
  13736. from failed circuits (if they haven't been connected yet) and attach
  13737. to new ones.
  13738. - Expire old streams that haven't managed to connect. Some day we'll
  13739. have them reattach to new circuits instead.
  13740. o Bugfixes:
  13741. - Fix several memory leaks that were causing servers to become bloated
  13742. after a while.
  13743. - Fix a few very rare assert triggers. A few more remain.
  13744. - Setuid to User _before_ complaining about running as root.
  13745. Changes in version 0.0.2pre19 - 2004-01-07
  13746. o Bugfixes:
  13747. - Fix deadlock condition in dns farm. We were telling a child to die by
  13748. closing the parent's file descriptor to him. But newer children were
  13749. inheriting the open file descriptor from the parent, and since they
  13750. weren't closing it, the socket never closed, so the child never read
  13751. eof, so he never knew to exit. Similarly, dns workers were holding
  13752. open other sockets, leading to all sorts of chaos.
  13753. - New cleaner daemon() code for forking and backgrounding.
  13754. - If you log to a file, it now prints an entry at the top of the
  13755. logfile so you know it's working.
  13756. - The onionskin challenge length was 30 bytes longer than necessary.
  13757. - Started to patch up the spec so it's not quite so out of date.
  13758. Changes in version 0.0.2pre18 - 2004-01-02
  13759. o Bugfixes:
  13760. - Fix endian issues with the 'integrity' field in the relay header.
  13761. - Fix a potential bug where connections in state
  13762. AP_CONN_STATE_CIRCUIT_WAIT might unexpectedly ask to write.
  13763. Changes in version 0.0.2pre17 - 2003-12-30
  13764. o Bugfixes:
  13765. - Made --debuglogfile (or any second log file, actually) work.
  13766. - Resolved an edge case in get_unique_circ_id_by_conn where a smart
  13767. adversary could force us into an infinite loop.
  13768. o Features:
  13769. - Each onionskin handshake now includes a hash of the computed key,
  13770. to prove the server's identity and help perfect forward secrecy.
  13771. - Changed cell size from 256 to 512 bytes (working toward compatibility
  13772. with MorphMix).
  13773. - Changed cell length to 2 bytes, and moved it to the relay header.
  13774. - Implemented end-to-end integrity checking for the payloads of
  13775. relay cells.
  13776. - Separated streamid from 'recognized' (otherwise circuits will get
  13777. messed up when we try to have streams exit from the middle). We
  13778. use the integrity-checking to confirm that a cell is addressed to
  13779. this hop.
  13780. - Randomize the initial circid and streamid values, so an adversary who
  13781. breaks into a node can't learn how many circuits or streams have
  13782. been made so far.
  13783. Changes in version 0.0.2pre16 - 2003-12-14
  13784. o Bugfixes:
  13785. - Fixed a bug that made HUP trigger an assert
  13786. - Fixed a bug where a circuit that immediately failed wasn't being
  13787. counted as a failed circuit in counting retries.
  13788. o Features:
  13789. - Now we close the circuit when we get a truncated cell: otherwise we're
  13790. open to an anonymity attack where a bad node in the path truncates
  13791. the circuit and then we open streams at him.
  13792. - Add port ranges to exit policies
  13793. - Add a conservative default exit policy
  13794. - Warn if you're running tor as root
  13795. - on HUP, retry OR connections and close/rebind listeners
  13796. - options.EntryNodes: try these nodes first when picking the first node
  13797. - options.ExitNodes: if your best choices happen to include any of
  13798. your preferred exit nodes, you choose among just those preferred
  13799. exit nodes.
  13800. - options.ExcludedNodes: nodes that are never picked in path building
  13801. Changes in version 0.0.2pre15 - 2003-12-03
  13802. o Robustness and bugfixes:
  13803. - Sometimes clients would cache incorrect DNS resolves, which would
  13804. really screw things up.
  13805. - An OP that goes offline would slowly leak all its sockets and stop
  13806. working.
  13807. - A wide variety of bugfixes in exit node selection, exit policy
  13808. handling, and processing pending streams when a new circuit is
  13809. established.
  13810. - Pick nodes for a path only from those the directory says are up
  13811. - Choose randomly from all running dirservers, not always the first one
  13812. - Increase allowed http header size for directory fetch.
  13813. - Stop writing to stderr (if we're daemonized it will be closed).
  13814. - Enable -g always, so cores will be more useful to me.
  13815. - Switch "-lcrypto -lssl" to "-lssl -lcrypto" for broken distributions.
  13816. o Documentation:
  13817. - Wrote a man page. It lists commonly used options.
  13818. o Configuration:
  13819. - Change default loglevel to warn.
  13820. - Make PidFile default to null rather than littering in your CWD.
  13821. - OnionRouter config option is now obsolete. Instead it just checks
  13822. ORPort>0.
  13823. - Moved to a single unified torrc file for both clients and servers.
  13824. Changes in version 0.0.2pre14 - 2003-11-29
  13825. o Robustness and bugfixes:
  13826. - Force the admin to make the DataDirectory himself
  13827. - to get ownership/permissions right
  13828. - so clients no longer make a DataDirectory and then never use it
  13829. - fix bug where a client who was offline for 45 minutes would never
  13830. pull down a directory again
  13831. - fix (or at least hide really well) the dns assert bug that was
  13832. causing server crashes
  13833. - warnings and improved robustness wrt clockskew for certs
  13834. - use the native daemon(3) to daemonize, when available
  13835. - exit if bind() fails
  13836. - exit if neither socksport nor orport is defined
  13837. - include our own tor_timegm (Win32 doesn't have its own)
  13838. - bugfix for win32 with lots of connections
  13839. - fix minor bias in PRNG
  13840. - make dirserver more robust to corrupt cached directory
  13841. o Documentation:
  13842. - Wrote the design document (woo)
  13843. o Circuit building and exit policies:
  13844. - Circuits no longer try to use nodes that the directory has told them
  13845. are down.
  13846. - Exit policies now support bitmasks (18.0.0.0/255.0.0.0) and
  13847. bitcounts (18.0.0.0/8).
  13848. - Make AP connections standby for a circuit if no suitable circuit
  13849. exists, rather than failing
  13850. - Circuits choose exit node based on addr/port, exit policies, and
  13851. which AP connections are standing by
  13852. - Bump min pathlen from 2 to 3
  13853. - Relay end cells have a payload to describe why the stream ended.
  13854. - If the stream failed because of exit policy, try again with a new
  13855. circuit.
  13856. - Clients have a dns cache to remember resolved addresses.
  13857. - Notice more quickly when we have no working circuits
  13858. o Configuration:
  13859. - APPort is now called SocksPort
  13860. - SocksBindAddress, ORBindAddress, DirBindAddress let you configure
  13861. where to bind
  13862. - RecommendedVersions is now a config variable rather than
  13863. hardcoded (for dirservers)
  13864. - Reloads config on HUP
  13865. - Usage info on -h or --help
  13866. - If you set User and Group config vars, it'll setu/gid to them.
  13867. Changes in version 0.0.2pre13 - 2003-10-19
  13868. o General stability:
  13869. - SSL_write no longer fails when it returns WANTWRITE and the number
  13870. of bytes in the buf has changed by the next SSL_write call.
  13871. - Fix segfault fetching directory when network is down
  13872. - Fix a variety of minor memory leaks
  13873. - Dirservers reload the fingerprints file on HUP, so I don't have
  13874. to take down the network when I approve a new router
  13875. - Default server config file has explicit Address line to specify fqdn
  13876. o Buffers:
  13877. - Buffers grow and shrink as needed (Cut process size from 20M to 2M)
  13878. - Make listener connections not ever alloc bufs
  13879. o Autoconf improvements:
  13880. - don't clobber an external CFLAGS in ./configure
  13881. - Make install now works
  13882. - create var/lib/tor on make install
  13883. - autocreate a tor.sh initscript to help distribs
  13884. - autocreate the torrc and sample-server-torrc with correct paths
  13885. o Log files and Daemonizing now work:
  13886. - If --DebugLogFile is specified, log to it at -l debug
  13887. - If --LogFile is specified, use it instead of commandline
  13888. - If --RunAsDaemon is set, tor forks and backgrounds on startup